/************************************************* * Exim - an Internet mail transport agent * *************************************************/ /* Copyright (c) University of Cambridge 1995 - 2018 */ /* See the file NOTICE for conditions of use and distribution. */ /* The main code for delivering a message. */ #include "exim.h" #include "transports/smtp.h" #include #include /* Data block for keeping track of subprocesses for parallel remote delivery. */ typedef struct pardata { address_item *addrlist; /* chain of addresses */ address_item *addr; /* next address data expected for */ pid_t pid; /* subprocess pid */ int fd; /* pipe fd for getting result from subprocess */ int transport_count; /* returned transport count value */ BOOL done; /* no more data needed */ uschar *msg; /* error message */ uschar *return_path; /* return_path for these addresses */ } pardata; /* Values for the process_recipients variable */ enum { RECIP_ACCEPT, RECIP_IGNORE, RECIP_DEFER, RECIP_FAIL, RECIP_FAIL_FILTER, RECIP_FAIL_TIMEOUT, RECIP_FAIL_LOOP}; /* Mutually recursive functions for marking addresses done. */ static void child_done(address_item *, uschar *); static void address_done(address_item *, uschar *); /* Table for turning base-62 numbers into binary */ static uschar tab62[] = {0,1,2,3,4,5,6,7,8,9,0,0,0,0,0,0, /* 0-9 */ 0,10,11,12,13,14,15,16,17,18,19,20, /* A-K */ 21,22,23,24,25,26,27,28,29,30,31,32, /* L-W */ 33,34,35, 0, 0, 0, 0, 0, /* X-Z */ 0,36,37,38,39,40,41,42,43,44,45,46, /* a-k */ 47,48,49,50,51,52,53,54,55,56,57,58, /* l-w */ 59,60,61}; /* x-z */ /************************************************* * Local static variables * *************************************************/ /* addr_duplicate is global because it needs to be seen from the Envelope-To writing code. */ static address_item *addr_defer = NULL; static address_item *addr_failed = NULL; static address_item *addr_fallback = NULL; static address_item *addr_local = NULL; static address_item *addr_new = NULL; static address_item *addr_remote = NULL; static address_item *addr_route = NULL; static address_item *addr_succeed = NULL; static address_item *addr_senddsn = NULL; static FILE *message_log = NULL; static BOOL update_spool; static BOOL remove_journal; static int parcount = 0; static pardata *parlist = NULL; static int return_count; static uschar *frozen_info = US""; static uschar *used_return_path = NULL; /************************************************* * read as much as requested * *************************************************/ /* The syscall read(2) doesn't always returns as much as we want. For several reasons it might get less. (Not talking about signals, as syscalls are restartable). When reading from a network or pipe connection the sender might send in smaller chunks, with delays between these chunks. The read(2) may return such a chunk. The more the writer writes and the smaller the pipe between write and read is, the more we get the chance of reading leass than requested. (See bug 2130) This function read(2)s until we got all the data we *requested*. Note: This function may block. Use it only if you're sure about the amount of data you will get. Argument: fd the file descriptor to read from buffer pointer to a buffer of size len len the requested(!) amount of bytes Returns: the amount of bytes read */ static ssize_t readn(int fd, void * buffer, size_t len) { uschar * next = buffer; uschar * end = next + len; while (next < end) { ssize_t got = read(fd, next, end - next); /* I'm not sure if there are signals that can interrupt us, for now I assume the worst */ if (got == -1 && errno == EINTR) continue; if (got <= 0) return next - US buffer; next += got; } return len; } /************************************************* * Make a new address item * *************************************************/ /* This function gets the store and initializes with default values. The transport_return value defaults to DEFER, so that any unexpected failure to deliver does not wipe out the message. The default unique string is set to a copy of the address, so that its domain can be lowercased. Argument: address the RFC822 address string copy force a copy of the address Returns: a pointer to an initialized address_item */ address_item * deliver_make_addr(uschar *address, BOOL copy) { address_item *addr = store_get(sizeof(address_item), FALSE); *addr = address_defaults; if (copy) address = string_copy(address); addr->address = address; addr->unique = string_copy(address); return addr; } /************************************************* * Set expansion values for an address * *************************************************/ /* Certain expansion variables are valid only when handling an address or address list. This function sets them up or clears the values, according to its argument. Arguments: addr the address in question, or NULL to clear values Returns: nothing */ void deliver_set_expansions(address_item *addr) { if (!addr) { const uschar ***p = address_expansions; while (*p) **p++ = NULL; return; } /* Exactly what gets set depends on whether there is one or more addresses, and what they contain. These first ones are always set, taking their values from the first address. */ if (!addr->host_list) { deliver_host = deliver_host_address = US""; deliver_host_port = 0; } else { deliver_host = addr->host_list->name; deliver_host_address = addr->host_list->address; deliver_host_port = addr->host_list->port; } deliver_recipients = addr; deliver_address_data = addr->prop.address_data; deliver_domain_data = addr->prop.domain_data; deliver_localpart_data = addr->prop.localpart_data; router_var = addr->prop.variables; /* These may be unset for multiple addresses */ deliver_domain = addr->domain; self_hostname = addr->self_hostname; #ifdef EXPERIMENTAL_BRIGHTMAIL bmi_deliver = 1; /* deliver by default */ bmi_alt_location = NULL; bmi_base64_verdict = NULL; bmi_base64_tracker_verdict = NULL; #endif /* If there's only one address we can set everything. */ if (!addr->next) { address_item *addr_orig; deliver_localpart = addr->local_part; deliver_localpart_prefix = addr->prefix; deliver_localpart_suffix = addr->suffix; for (addr_orig = addr; addr_orig->parent; addr_orig = addr_orig->parent) ; deliver_domain_orig = addr_orig->domain; /* Re-instate any prefix and suffix in the original local part. In all normal cases, the address will have a router associated with it, and we can choose the caseful or caseless version accordingly. However, when a system filter sets up a pipe, file, or autoreply delivery, no router is involved. In this case, though, there won't be any prefix or suffix to worry about. */ deliver_localpart_orig = !addr_orig->router ? addr_orig->local_part : addr_orig->router->caseful_local_part ? addr_orig->cc_local_part : addr_orig->lc_local_part; /* If there's a parent, make its domain and local part available, and if delivering to a pipe or file, or sending an autoreply, get the local part from the parent. For pipes and files, put the pipe or file string into address_pipe and address_file. */ if (addr->parent) { deliver_domain_parent = addr->parent->domain; deliver_localpart_parent = !addr->parent->router ? addr->parent->local_part : addr->parent->router->caseful_local_part ? addr->parent->cc_local_part : addr->parent->lc_local_part; /* File deliveries have their own flag because they need to be picked out as special more often. */ if (testflag(addr, af_pfr)) { if (testflag(addr, af_file)) address_file = addr->local_part; else if (deliver_localpart[0] == '|') address_pipe = addr->local_part; deliver_localpart = addr->parent->local_part; deliver_localpart_prefix = addr->parent->prefix; deliver_localpart_suffix = addr->parent->suffix; } } #ifdef EXPERIMENTAL_BRIGHTMAIL /* Set expansion variables related to Brightmail AntiSpam */ bmi_base64_verdict = bmi_get_base64_verdict(deliver_localpart_orig, deliver_domain_orig); bmi_base64_tracker_verdict = bmi_get_base64_tracker_verdict(bmi_base64_verdict); /* get message delivery status (0 - don't deliver | 1 - deliver) */ bmi_deliver = bmi_get_delivery_status(bmi_base64_verdict); /* if message is to be delivered, get eventual alternate location */ if (bmi_deliver == 1) bmi_alt_location = bmi_get_alt_location(bmi_base64_verdict); #endif } /* For multiple addresses, don't set local part, and leave the domain and self_hostname set only if it is the same for all of them. It is possible to have multiple pipe and file addresses, but only when all addresses have routed to the same pipe or file. */ else { if (testflag(addr, af_pfr)) { if (testflag(addr, af_file)) address_file = addr->local_part; else if (addr->local_part[0] == '|') address_pipe = addr->local_part; } for (address_item * addr2 = addr->next; addr2; addr2 = addr2->next) { if (deliver_domain && Ustrcmp(deliver_domain, addr2->domain) != 0) deliver_domain = NULL; if ( self_hostname && ( !addr2->self_hostname || Ustrcmp(self_hostname, addr2->self_hostname) != 0 ) ) self_hostname = NULL; if (!deliver_domain && !self_hostname) break; } } } /************************************************* * Open a msglog file * *************************************************/ /* This function is used both for normal message logs, and for files in the msglog directory that are used to catch output from pipes. Try to create the directory if it does not exist. From release 4.21, normal message logs should be created when the message is received. Called from deliver_message(), can be operating as root. Argument: filename the file name mode the mode required error used for saying what failed Returns: a file descriptor, or -1 (with errno set) */ static int open_msglog_file(uschar *filename, int mode, uschar **error) { for (int i = 2; i > 0; i--) { int fd = Uopen(filename, #ifdef O_CLOEXEC O_CLOEXEC | #endif #ifdef O_NOFOLLOW O_NOFOLLOW | #endif O_WRONLY|O_APPEND|O_CREAT, mode); if (fd >= 0) { /* Set the close-on-exec flag and change the owner to the exim uid/gid (this function is called as root). Double check the mode, because the group setting doesn't always get set automatically. */ #ifndef O_CLOEXEC (void)fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC); #endif if (exim_fchown(fd, exim_uid, exim_gid, filename) < 0) { *error = US"chown"; return -1; } if (fchmod(fd, mode) < 0) { *error = US"chmod"; return -1; } return fd; } if (errno != ENOENT) break; (void)directory_make(spool_directory, spool_sname(US"msglog", message_subdir), MSGLOG_DIRECTORY_MODE, TRUE); } *error = US"create or open"; return -1; } /************************************************* * Write to msglog if required * *************************************************/ /* Write to the message log, if configured. This function may also be called from transports. Arguments: format a string format Returns: nothing */ void deliver_msglog(const char *format, ...) { va_list ap; if (!message_logs) return; va_start(ap, format); vfprintf(message_log, format, ap); fflush(message_log); va_end(ap); } /************************************************* * Replicate status for batch * *************************************************/ /* When a transport handles a batch of addresses, it may treat them individually, or it may just put the status in the first one, and return FALSE, requesting that the status be copied to all the others externally. This is the replication function. As well as the status, it copies the transport pointer, which may have changed if appendfile passed the addresses on to a different transport. Argument: pointer to the first address in a chain Returns: nothing */ static void replicate_status(address_item *addr) { for (address_item * addr2 = addr->next; addr2; addr2 = addr2->next) { addr2->transport = addr->transport; addr2->transport_return = addr->transport_return; addr2->basic_errno = addr->basic_errno; addr2->more_errno = addr->more_errno; addr2->delivery_usec = addr->delivery_usec; addr2->special_action = addr->special_action; addr2->message = addr->message; addr2->user_message = addr->user_message; } } /************************************************* * Compare lists of hosts * *************************************************/ /* This function is given two pointers to chains of host items, and it yields TRUE if the lists refer to the same hosts in the same order, except that (1) Multiple hosts with the same non-negative MX values are permitted to appear in different orders. Round-robinning nameservers can cause this to happen. (2) Multiple hosts with the same negative MX values less than MX_NONE are also permitted to appear in different orders. This is caused by randomizing hosts lists. This enables Exim to use a single SMTP transaction for sending to two entirely different domains that happen to end up pointing at the same hosts. Arguments: one points to the first host list two points to the second host list Returns: TRUE if the lists refer to the same host set */ static BOOL same_hosts(host_item *one, host_item *two) { while (one && two) { if (Ustrcmp(one->name, two->name) != 0) { int mx = one->mx; host_item *end_one = one; host_item *end_two = two; /* Batch up only if there was no MX and the list was not randomized */ if (mx == MX_NONE) return FALSE; /* Find the ends of the shortest sequence of identical MX values */ while ( end_one->next && end_one->next->mx == mx && end_two->next && end_two->next->mx == mx) { end_one = end_one->next; end_two = end_two->next; } /* If there aren't any duplicates, there's no match. */ if (end_one == one) return FALSE; /* For each host in the 'one' sequence, check that it appears in the 'two' sequence, returning FALSE if not. */ for (;;) { host_item *hi; for (hi = two; hi != end_two->next; hi = hi->next) if (Ustrcmp(one->name, hi->name) == 0) break; if (hi == end_two->next) return FALSE; if (one == end_one) break; one = one->next; } /* All the hosts in the 'one' sequence were found in the 'two' sequence. Ensure both are pointing at the last host, and carry on as for equality. */ two = end_two; } /* if the names matched but ports do not, mismatch */ else if (one->port != two->port) return FALSE; /* Hosts matched */ one = one->next; two = two->next; } /* True if both are NULL */ return (one == two); } /************************************************* * Compare header lines * *************************************************/ /* This function is given two pointers to chains of header items, and it yields TRUE if they are the same header texts in the same order. Arguments: one points to the first header list two points to the second header list Returns: TRUE if the lists refer to the same header set */ static BOOL same_headers(header_line *one, header_line *two) { for (;; one = one->next, two = two->next) { if (one == two) return TRUE; /* Includes the case where both NULL */ if (!one || !two) return FALSE; if (Ustrcmp(one->text, two->text) != 0) return FALSE; } } /************************************************* * Compare string settings * *************************************************/ /* This function is given two pointers to strings, and it returns TRUE if they are the same pointer, or if the two strings are the same. Arguments: one points to the first string two points to the second string Returns: TRUE or FALSE */ static BOOL same_strings(uschar *one, uschar *two) { if (one == two) return TRUE; /* Includes the case where both NULL */ if (!one || !two) return FALSE; return (Ustrcmp(one, two) == 0); } /************************************************* * Compare uid/gid for addresses * *************************************************/ /* This function is given a transport and two addresses. It yields TRUE if the uid/gid/initgroups settings for the two addresses are going to be the same when they are delivered. Arguments: tp the transort addr1 the first address addr2 the second address Returns: TRUE or FALSE */ static BOOL same_ugid(transport_instance *tp, address_item *addr1, address_item *addr2) { if ( !tp->uid_set && !tp->expand_uid && !tp->deliver_as_creator && ( testflag(addr1, af_uid_set) != testflag(addr2, af_gid_set) || ( testflag(addr1, af_uid_set) && ( addr1->uid != addr2->uid || testflag(addr1, af_initgroups) != testflag(addr2, af_initgroups) ) ) ) ) return FALSE; if ( !tp->gid_set && !tp->expand_gid && ( testflag(addr1, af_gid_set) != testflag(addr2, af_gid_set) || ( testflag(addr1, af_gid_set) && addr1->gid != addr2->gid ) ) ) return FALSE; return TRUE; } /************************************************* * Record that an address is complete * *************************************************/ /* This function records that an address is complete. This is straightforward for most addresses, where the unique address is just the full address with the domain lower cased. For homonyms (addresses that are the same as one of their ancestors) their are complications. Their unique addresses have \x\ prepended (where x = 0, 1, 2...), so that de-duplication works correctly for siblings and cousins. Exim used to record the unique addresses of homonyms as "complete". This, however, fails when the pattern of redirection varies over time (e.g. if taking unseen copies at only some times of day) because the prepended numbers may vary from one delivery run to the next. This problem is solved by never recording prepended unique addresses as complete. Instead, when a homonymic address has actually been delivered via a transport, we record its basic unique address followed by the name of the transport. This is checked in subsequent delivery runs whenever an address is routed to a transport. If the completed address is a top-level one (has no parent, which means it cannot be homonymic) we also add the original address to the non-recipients tree, so that it gets recorded in the spool file and therefore appears as "done" in any spool listings. The original address may differ from the unique address in the case of the domain. Finally, this function scans the list of duplicates, marks as done any that match this address, and calls child_done() for their ancestors. Arguments: addr address item that has been completed now current time as a string Returns: nothing */ static void address_done(address_item *addr, uschar *now) { update_spool = TRUE; /* Ensure spool gets updated */ /* Top-level address */ if (!addr->parent) { tree_add_nonrecipient(addr->unique); tree_add_nonrecipient(addr->address); } /* Homonymous child address */ else if (testflag(addr, af_homonym)) { if (addr->transport) tree_add_nonrecipient( string_sprintf("%s/%s", addr->unique + 3, addr->transport->name)); } /* Non-homonymous child address */ else tree_add_nonrecipient(addr->unique); /* Check the list of duplicate addresses and ensure they are now marked done as well. */ for (address_item * dup = addr_duplicate; dup; dup = dup->next) if (Ustrcmp(addr->unique, dup->unique) == 0) { tree_add_nonrecipient(dup->unique); child_done(dup, now); } } /************************************************* * Decrease counts in parents and mark done * *************************************************/ /* This function is called when an address is complete. If there is a parent address, its count of children is decremented. If there are still other children outstanding, the function exits. Otherwise, if the count has become zero, address_done() is called to mark the parent and its duplicates complete. Then loop for any earlier ancestors. Arguments: addr points to the completed address item now the current time as a string, for writing to the message log Returns: nothing */ static void child_done(address_item *addr, uschar *now) { while (addr->parent) { address_item *aa; addr = addr->parent; if (--addr->child_count > 0) return; /* Incomplete parent */ address_done(addr, now); /* Log the completion of all descendents only when there is no ancestor with the same original address. */ for (aa = addr->parent; aa; aa = aa->parent) if (Ustrcmp(aa->address, addr->address) == 0) break; if (aa) continue; deliver_msglog("%s %s: children all complete\n", now, addr->address); DEBUG(D_deliver) debug_printf("%s: children all complete\n", addr->address); } } /************************************************* * Delivery logging support functions * *************************************************/ /* The LOGGING() checks in d_log_interface() are complicated for backwards compatibility. When outgoing interface logging was originally added, it was conditional on just incoming_interface (which is off by default). The outgoing_interface option is on by default to preserve this behaviour, but you can enable incoming_interface and disable outgoing_interface to get I= fields on incoming lines only. Arguments: g The log line addr The address to be logged Returns: New value for s */ static gstring * d_log_interface(gstring * g) { if (LOGGING(incoming_interface) && LOGGING(outgoing_interface) && sending_ip_address) { g = string_fmt_append(g, " I=[%s]", sending_ip_address); if (LOGGING(outgoing_port)) g = string_fmt_append(g, ":%d", sending_port); } return g; } static gstring * d_hostlog(gstring * g, address_item * addr) { host_item * h = addr->host_used; g = string_append(g, 2, US" H=", h->name); if (LOGGING(dnssec) && h->dnssec == DS_YES) g = string_catn(g, US" DS", 3); g = string_append(g, 3, US" [", h->address, US"]"); if (LOGGING(outgoing_port)) g = string_fmt_append(g, ":%d", h->port); #ifdef SUPPORT_SOCKS if (LOGGING(proxy) && proxy_local_address) { g = string_append(g, 3, US" PRX=[", proxy_local_address, US"]"); if (LOGGING(outgoing_port)) g = string_fmt_append(g, ":%d", proxy_local_port); } #endif g = d_log_interface(g); if (testflag(addr, af_tcp_fastopen)) g = string_catn(g, US" TFO*", testflag(addr, af_tcp_fastopen_data) ? 5 : 4); return g; } #ifndef DISABLE_TLS static gstring * d_tlslog(gstring * g, address_item * addr) { if (LOGGING(tls_cipher) && addr->cipher) { g = string_append(g, 2, US" X=", addr->cipher); #ifdef EXPERIMENTAL_TLS_RESUME if (LOGGING(tls_resumption) && testflag(addr, af_tls_resume)) g = string_catn(g, US"*", 1); #endif } if (LOGGING(tls_certificate_verified) && addr->cipher) g = string_append(g, 2, US" CV=", testflag(addr, af_cert_verified) ? #ifdef SUPPORT_DANE testflag(addr, af_dane_verified) ? "dane" : #endif "yes" : "no"); if (LOGGING(tls_peerdn) && addr->peerdn) g = string_append(g, 3, US" DN=\"", string_printing(addr->peerdn), US"\""); return g; } #endif #ifndef DISABLE_EVENT uschar * event_raise(uschar * action, const uschar * event, uschar * ev_data) { uschar * s; if (action) { DEBUG(D_deliver) debug_printf("Event(%s): event_action=|%s| delivery_IP=%s\n", event, action, deliver_host_address); event_name = event; event_data = ev_data; if (!(s = expand_string(action)) && *expand_string_message) log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand event_action %s in %s: %s\n", event, transport_name ? transport_name : US"main", expand_string_message); event_name = event_data = NULL; /* If the expansion returns anything but an empty string, flag for the caller to modify his normal processing */ if (s && *s) { DEBUG(D_deliver) debug_printf("Event(%s): event_action returned \"%s\"\n", event, s); errno = ERRNO_EVENT; return s; } } return NULL; } void msg_event_raise(const uschar * event, const address_item * addr) { const uschar * save_domain = deliver_domain; uschar * save_local = deliver_localpart; const uschar * save_host = deliver_host; const uschar * save_address = deliver_host_address; const int save_port = deliver_host_port; router_name = addr->router ? addr->router->name : NULL; deliver_domain = addr->domain; deliver_localpart = addr->local_part; deliver_host = addr->host_used ? addr->host_used->name : NULL; if (!addr->transport) { if (Ustrcmp(event, "msg:fail:delivery") == 0) { /* An address failed with no transport involved. This happens when a filter was used which triggered a fail command (in such a case a transport isn't needed). Convert it to an internal fail event. */ (void) event_raise(event_action, US"msg:fail:internal", addr->message); } } else { transport_name = addr->transport->name; (void) event_raise(addr->transport->event_action, event, addr->host_used || Ustrcmp(addr->transport->driver_name, "smtp") == 0 || Ustrcmp(addr->transport->driver_name, "lmtp") == 0 || Ustrcmp(addr->transport->driver_name, "autoreply") == 0 ? addr->message : NULL); } deliver_host_port = save_port; deliver_host_address = save_address; deliver_host = save_host; deliver_localpart = save_local; deliver_domain = save_domain; router_name = transport_name = NULL; } #endif /*DISABLE_EVENT*/ /******************************************************************************/ /************************************************* * Generate local prt for logging * *************************************************/ /* This function is a subroutine for use in string_log_address() below. Arguments: addr the address being logged yield the current dynamic buffer pointer Returns: the new value of the buffer pointer */ static gstring * string_get_localpart(address_item * addr, gstring * yield) { uschar * s; s = addr->prefix; if (testflag(addr, af_include_affixes) && s) { #ifdef SUPPORT_I18N if (testflag(addr, af_utf8_downcvt)) s = string_localpart_utf8_to_alabel(s, NULL); #endif yield = string_cat(yield, s); } s = addr->local_part; #ifdef SUPPORT_I18N if (testflag(addr, af_utf8_downcvt)) s = string_localpart_utf8_to_alabel(s, NULL); #endif yield = string_cat(yield, s); s = addr->suffix; if (testflag(addr, af_include_affixes) && s) { #ifdef SUPPORT_I18N if (testflag(addr, af_utf8_downcvt)) s = string_localpart_utf8_to_alabel(s, NULL); #endif yield = string_cat(yield, s); } return yield; } /************************************************* * Generate log address list * *************************************************/ /* This function generates a list consisting of an address and its parents, for use in logging lines. For saved onetime aliased addresses, the onetime parent field is used. If the address was delivered by a transport with rcpt_include_ affixes set, the af_include_affixes bit will be set in the address. In that case, we include the affixes here too. Arguments: g points to growing-string struct addr bottom (ultimate) address all_parents if TRUE, include all parents success TRUE for successful delivery Returns: a growable string in dynamic store */ static gstring * string_log_address(gstring * g, address_item *addr, BOOL all_parents, BOOL success) { BOOL add_topaddr = TRUE; address_item *topaddr; /* Find the ultimate parent */ for (topaddr = addr; topaddr->parent; topaddr = topaddr->parent) ; /* We start with just the local part for pipe, file, and reply deliveries, and for successful local deliveries from routers that have the log_as_local flag set. File deliveries from filters can be specified as non-absolute paths in cases where the transport is going to complete the path. If there is an error before this happens (expansion failure) the local part will not be updated, and so won't necessarily look like a path. Add extra text for this case. */ if ( testflag(addr, af_pfr) || ( success && addr->router && addr->router->log_as_local && addr->transport && addr->transport->info->local ) ) { if (testflag(addr, af_file) && addr->local_part[0] != '/') g = string_catn(g, CUS"save ", 5); g = string_get_localpart(addr, g); } /* Other deliveries start with the full address. It we have split it into local part and domain, use those fields. Some early failures can happen before the splitting is done; in those cases use the original field. */ else { uschar * cmp; int off = g->ptr; /* start of the "full address" */ if (addr->local_part) { const uschar * s; g = string_get_localpart(addr, g); g = string_catn(g, US"@", 1); s = addr->domain; #ifdef SUPPORT_I18N if (testflag(addr, af_utf8_downcvt)) s = string_localpart_utf8_to_alabel(s, NULL); #endif g = string_cat(g, s); } else g = string_cat(g, addr->address); /* If the address we are going to print is the same as the top address, and all parents are not being included, don't add on the top address. First of all, do a caseless comparison; if this succeeds, do a caseful comparison on the local parts. */ cmp = g->s + off; /* only now, as rebuffer likely done */ string_from_gstring(g); /* ensure nul-terminated */ if ( strcmpic(cmp, topaddr->address) == 0 && Ustrncmp(cmp, topaddr->address, Ustrchr(cmp, '@') - cmp) == 0 && !addr->onetime_parent && (!all_parents || !addr->parent || addr->parent == topaddr) ) add_topaddr = FALSE; } /* If all parents are requested, or this is a local pipe/file/reply, and there is at least one intermediate parent, show it in brackets, and continue with all of them if all are wanted. */ if ( (all_parents || testflag(addr, af_pfr)) && addr->parent && addr->parent != topaddr) { uschar *s = US" ("; for (address_item * addr2 = addr->parent; addr2 != topaddr; addr2 = addr2->parent) { g = string_catn(g, s, 2); g = string_cat (g, addr2->address); if (!all_parents) break; s = US", "; } g = string_catn(g, US")", 1); } /* Add the top address if it is required */ if (add_topaddr) g = string_append(g, 3, US" <", addr->onetime_parent ? addr->onetime_parent : topaddr->address, US">"); return g; } void timesince(struct timeval * diff, struct timeval * then) { gettimeofday(diff, NULL); diff->tv_sec -= then->tv_sec; if ((diff->tv_usec -= then->tv_usec) < 0) { diff->tv_sec--; diff->tv_usec += 1000*1000; } } uschar * string_timediff(struct timeval * diff) { static uschar buf[sizeof("0.000s")]; if (diff->tv_sec >= 5 || !LOGGING(millisec)) return readconf_printtime((int)diff->tv_sec); sprintf(CS buf, "%u.%03us", (uint)diff->tv_sec, (uint)diff->tv_usec/1000); return buf; } uschar * string_timesince(struct timeval * then) { struct timeval diff; timesince(&diff, then); return string_timediff(&diff); } /******************************************************************************/ /* If msg is NULL this is a delivery log and logchar is used. Otherwise this is a nonstandard call; no two-character delivery flag is written but sender-host and sender are prefixed and "msg" is inserted in the log line. Arguments: flags passed to log_write() */ void delivery_log(int flags, address_item * addr, int logchar, uschar * msg) { gstring * g; /* Used for a temporary, expanding buffer, for building log lines */ rmark reset_point; /* Log the delivery on the main log. We use an extensible string to build up the log line, and reset the store afterwards. Remote deliveries should always have a pointer to the host item that succeeded; local deliveries can have a pointer to a single host item in their host list, for use by the transport. */ #ifndef DISABLE_EVENT /* presume no successful remote delivery */ lookup_dnssec_authenticated = NULL; #endif reset_point = store_mark(); g = string_get_tainted(256, TRUE); /* addrs will be tainted, so avoid copy */ if (msg) g = string_append(g, 2, host_and_ident(TRUE), US" "); else { g->s[0] = logchar; g->ptr = 1; g = string_catn(g, US"> ", 2); } g = string_log_address(g, addr, LOGGING(all_parents), TRUE); if (LOGGING(sender_on_delivery) || msg) g = string_append(g, 3, US" F=<", #ifdef SUPPORT_I18N testflag(addr, af_utf8_downcvt) ? string_address_utf8_to_alabel(sender_address, NULL) : #endif sender_address, US">"); if (*queue_name) g = string_append(g, 2, US" Q=", queue_name); #ifdef EXPERIMENTAL_SRS if(addr->prop.srs_sender) g = string_append(g, 3, US" SRS=<", addr->prop.srs_sender, US">"); #endif /* You might think that the return path must always be set for a successful delivery; indeed, I did for some time, until this statement crashed. The case when it is not set is for a delivery to /dev/null which is optimised by not being run at all. */ if (used_return_path && LOGGING(return_path_on_delivery)) g = string_append(g, 3, US" P=<", used_return_path, US">"); if (msg) g = string_append(g, 2, US" ", msg); /* For a delivery from a system filter, there may not be a router */ if (addr->router) g = string_append(g, 2, US" R=", addr->router->name); g = string_append(g, 2, US" T=", addr->transport->name); if (LOGGING(delivery_size)) g = string_fmt_append(g, " S=%d", transport_count); /* Local delivery */ if (addr->transport->info->local) { if (addr->host_list) g = string_append(g, 2, US" H=", addr->host_list->name); g = d_log_interface(g); if (addr->shadow_message) g = string_cat(g, addr->shadow_message); } /* Remote delivery */ else { if (addr->host_used) { g = d_hostlog(g, addr); if (continue_sequence > 1) g = string_catn(g, US"*", 1); #ifndef DISABLE_EVENT deliver_host_address = addr->host_used->address; deliver_host_port = addr->host_used->port; deliver_host = addr->host_used->name; /* DNS lookup status */ lookup_dnssec_authenticated = addr->host_used->dnssec==DS_YES ? US"yes" : addr->host_used->dnssec==DS_NO ? US"no" : NULL; #endif } #ifndef DISABLE_TLS g = d_tlslog(g, addr); #endif if (addr->authenticator) { g = string_append(g, 2, US" A=", addr->authenticator); if (addr->auth_id) { g = string_append(g, 2, US":", addr->auth_id); if (LOGGING(smtp_mailauth) && addr->auth_sndr) g = string_append(g, 2, US":", addr->auth_sndr); } } if (LOGGING(pipelining)) { if (testflag(addr, af_pipelining)) g = string_catn(g, US" L", 2); #ifdef SUPPORT_PIPE_CONNECT if (testflag(addr, af_early_pipe)) g = string_catn(g, US"*", 1); #endif } #ifndef DISABLE_PRDR if (testflag(addr, af_prdr_used)) g = string_catn(g, US" PRDR", 5); #endif if (testflag(addr, af_chunking_used)) g = string_catn(g, US" K", 2); } /* confirmation message (SMTP (host_used) and LMTP (driver_name)) */ if ( LOGGING(smtp_confirmation) && addr->message && (addr->host_used || Ustrcmp(addr->transport->driver_name, "lmtp") == 0) ) { unsigned lim = big_buffer_size < 1024 ? big_buffer_size : 1024; uschar *p = big_buffer; uschar *ss = addr->message; *p++ = '\"'; for (int i = 0; i < lim && ss[i] != 0; i++) /* limit logged amount */ { if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\'; /* quote \ and " */ *p++ = ss[i]; } *p++ = '\"'; *p = 0; g = string_append(g, 2, US" C=", big_buffer); } /* Time on queue and actual time taken to deliver */ if (LOGGING(queue_time)) g = string_append(g, 2, US" QT=", string_timesince(&received_time)); if (LOGGING(deliver_time)) { struct timeval diff = {.tv_sec = addr->more_errno, .tv_usec = addr->delivery_usec}; g = string_append(g, 2, US" DT=", string_timediff(&diff)); } /* string_cat() always leaves room for the terminator. Release the store we used to build the line after writing it. */ log_write(0, flags, "%s", string_from_gstring(g)); #ifndef DISABLE_EVENT if (!msg) msg_event_raise(US"msg:delivery", addr); #endif store_reset(reset_point); return; } static void deferral_log(address_item * addr, uschar * now, int logflags, uschar * driver_name, uschar * driver_kind) { rmark reset_point = store_mark(); gstring * g = string_get(256); /* Build up the line that is used for both the message log and the main log. */ /* Create the address string for logging. Must not do this earlier, because an OK result may be changed to FAIL when a pipe returns text. */ g = string_log_address(g, addr, LOGGING(all_parents), FALSE); if (*queue_name) g = string_append(g, 2, US" Q=", queue_name); /* Either driver_name contains something and driver_kind contains " router" or " transport" (note the leading space), or driver_name is a null string and driver_kind contains "routing" without the leading space, if all routing has been deferred. When a domain has been held, so nothing has been done at all, both variables contain null strings. */ if (driver_name) { if (driver_kind[1] == 't' && addr->router) g = string_append(g, 2, US" R=", addr->router->name); g = string_fmt_append(g, " %c=%s", toupper(driver_kind[1]), driver_name); } else if (driver_kind) g = string_append(g, 2, US" ", driver_kind); g = string_fmt_append(g, " defer (%d)", addr->basic_errno); if (addr->basic_errno > 0) g = string_append(g, 2, US": ", US strerror(addr->basic_errno)); if (addr->host_used) { g = string_append(g, 5, US" H=", addr->host_used->name, US" [", addr->host_used->address, US"]"); if (LOGGING(outgoing_port)) { int port = addr->host_used->port; g = string_fmt_append(g, ":%d", port == PORT_NONE ? 25 : port); } } if (addr->message) g = string_append(g, 2, US": ", addr->message); (void) string_from_gstring(g); /* Log the deferment in the message log, but don't clutter it up with retry-time defers after the first delivery attempt. */ if (f.deliver_firsttime || addr->basic_errno > ERRNO_RETRY_BASE) deliver_msglog("%s %s\n", now, g->s); /* Write the main log and reset the store. For errors of the type "retry time not reached" (also remotes skipped on queue run), logging is controlled by L_retry_defer. Note that this kind of error number is negative, and all the retry ones are less than any others. */ log_write(addr->basic_errno <= ERRNO_RETRY_BASE ? L_retry_defer : 0, logflags, "== %s", g->s); store_reset(reset_point); return; } static void failure_log(address_item * addr, uschar * driver_kind, uschar * now) { rmark reset_point = store_mark(); gstring * g = string_get(256); #ifndef DISABLE_EVENT /* Message failures for which we will send a DSN get their event raised later so avoid doing it here. */ if ( !addr->prop.ignore_error && !(addr->dsn_flags & (rf_dsnflags & ~rf_notify_failure)) ) msg_event_raise(US"msg:fail:delivery", addr); #endif /* Build up the log line for the message and main logs */ /* Create the address string for logging. Must not do this earlier, because an OK result may be changed to FAIL when a pipe returns text. */ g = string_log_address(g, addr, LOGGING(all_parents), FALSE); if (LOGGING(sender_on_delivery)) g = string_append(g, 3, US" F=<", sender_address, US">"); if (*queue_name) g = string_append(g, 2, US" Q=", queue_name); /* Return path may not be set if no delivery actually happened */ if (used_return_path && LOGGING(return_path_on_delivery)) g = string_append(g, 3, US" P=<", used_return_path, US">"); if (addr->router) g = string_append(g, 2, US" R=", addr->router->name); if (addr->transport) g = string_append(g, 2, US" T=", addr->transport->name); if (addr->host_used) g = d_hostlog(g, addr); #ifndef DISABLE_TLS g = d_tlslog(g, addr); #endif if (addr->basic_errno > 0) g = string_append(g, 2, US": ", US strerror(addr->basic_errno)); if (addr->message) g = string_append(g, 2, US": ", addr->message); (void) string_from_gstring(g); /* Do the logging. For the message log, "routing failed" for those cases, just to make it clearer. */ if (driver_kind) deliver_msglog("%s %s failed for %s\n", now, driver_kind, g->s); else deliver_msglog("%s %s\n", now, g->s); log_write(0, LOG_MAIN, "** %s", g->s); store_reset(reset_point); return; } /************************************************* * Actions at the end of handling an address * *************************************************/ /* This is a function for processing a single address when all that can be done with it has been done. Arguments: addr points to the address block result the result of the delivery attempt logflags flags for log_write() (LOG_MAIN and/or LOG_PANIC) driver_type indicates which type of driver (transport, or router) was last to process the address logchar '=' or '-' for use when logging deliveries with => or -> Returns: nothing */ static void post_process_one(address_item *addr, int result, int logflags, int driver_type, int logchar) { uschar *now = tod_stamp(tod_log); uschar *driver_kind = NULL; uschar *driver_name = NULL; DEBUG(D_deliver) debug_printf("post-process %s (%d)\n", addr->address, result); /* Set up driver kind and name for logging. Disable logging if the router or transport has disabled it. */ if (driver_type == EXIM_DTYPE_TRANSPORT) { if (addr->transport) { driver_name = addr->transport->name; driver_kind = US" transport"; f.disable_logging = addr->transport->disable_logging; } else driver_kind = US"transporting"; } else if (driver_type == EXIM_DTYPE_ROUTER) { if (addr->router) { driver_name = addr->router->name; driver_kind = US" router"; f.disable_logging = addr->router->disable_logging; } else driver_kind = US"routing"; } /* If there's an error message set, ensure that it contains only printing characters - it should, but occasionally things slip in and this at least stops the log format from getting wrecked. We also scan the message for an LDAP expansion item that has a password setting, and flatten the password. This is a fudge, but I don't know a cleaner way of doing this. (If the item is badly malformed, it won't ever have gone near LDAP.) */ if (addr->message) { const uschar * s = string_printing(addr->message); /* deconst cast ok as string_printing known to have alloc'n'copied */ addr->message = expand_hide_passwords(US s); } /* If we used a transport that has one of the "return_output" options set, and if it did in fact generate some output, then for return_output we treat the message as failed if it was not already set that way, so that the output gets returned to the sender, provided there is a sender to send it to. For return_fail_output, do this only if the delivery failed. Otherwise we just unlink the file, and remove the name so that if the delivery failed, we don't try to send back an empty or unwanted file. The log_output options operate only on a non-empty file. In any case, we close the message file, because we cannot afford to leave a file-descriptor for one address while processing (maybe very many) others. */ if (addr->return_file >= 0 && addr->return_filename) { BOOL return_output = FALSE; struct stat statbuf; (void)EXIMfsync(addr->return_file); /* If there is no output, do nothing. */ if (fstat(addr->return_file, &statbuf) == 0 && statbuf.st_size > 0) { transport_instance *tb = addr->transport; /* Handle logging options */ if ( tb->log_output || result == FAIL && tb->log_fail_output || result == DEFER && tb->log_defer_output ) { uschar *s; FILE *f = Ufopen(addr->return_filename, "rb"); if (!f) log_write(0, LOG_MAIN|LOG_PANIC, "failed to open %s to log output " "from %s transport: %s", addr->return_filename, tb->name, strerror(errno)); else if ((s = US Ufgets(big_buffer, big_buffer_size, f))) { uschar *p = big_buffer + Ustrlen(big_buffer); const uschar * sp; while (p > big_buffer && isspace(p[-1])) p--; *p = 0; sp = string_printing(big_buffer); log_write(0, LOG_MAIN, "<%s>: %s transport output: %s", addr->address, tb->name, sp); } (void)fclose(f); } /* Handle returning options, but only if there is an address to return the text to. */ if (sender_address[0] != 0 || addr->prop.errors_address) if (tb->return_output) { addr->transport_return = result = FAIL; if (addr->basic_errno == 0 && !addr->message) addr->message = US"return message generated"; return_output = TRUE; } else if (tb->return_fail_output && result == FAIL) return_output = TRUE; } /* Get rid of the file unless it might be returned, but close it in all cases. */ if (!return_output) { Uunlink(addr->return_filename); addr->return_filename = NULL; addr->return_file = -1; } (void)close(addr->return_file); } /* The success case happens only after delivery by a transport. */ if (result == OK) { addr->next = addr_succeed; addr_succeed = addr; /* Call address_done() to ensure that we don't deliver to this address again, and write appropriate things to the message log. If it is a child address, we call child_done() to scan the ancestors and mark them complete if this is the last child to complete. */ address_done(addr, now); DEBUG(D_deliver) debug_printf("%s delivered\n", addr->address); if (!addr->parent) deliver_msglog("%s %s: %s%s succeeded\n", now, addr->address, driver_name, driver_kind); else { deliver_msglog("%s %s <%s>: %s%s succeeded\n", now, addr->address, addr->parent->address, driver_name, driver_kind); child_done(addr, now); } /* Certificates for logging (via events) */ #ifndef DISABLE_TLS tls_out.ourcert = addr->ourcert; addr->ourcert = NULL; tls_out.peercert = addr->peercert; addr->peercert = NULL; tls_out.cipher = addr->cipher; tls_out.peerdn = addr->peerdn; tls_out.ocsp = addr->ocsp; # ifdef SUPPORT_DANE tls_out.dane_verified = testflag(addr, af_dane_verified); # endif #endif delivery_log(LOG_MAIN, addr, logchar, NULL); #ifndef DISABLE_TLS tls_free_cert(&tls_out.ourcert); tls_free_cert(&tls_out.peercert); tls_out.cipher = NULL; tls_out.peerdn = NULL; tls_out.ocsp = OCSP_NOT_REQ; # ifdef SUPPORT_DANE tls_out.dane_verified = FALSE; # endif #endif } /* Soft failure, or local delivery process failed; freezing may be requested. */ else if (result == DEFER || result == PANIC) { if (result == PANIC) logflags |= LOG_PANIC; /* This puts them on the chain in reverse order. Do not change this, because the code for handling retries assumes that the one with the retry information is last. */ addr->next = addr_defer; addr_defer = addr; /* The only currently implemented special action is to freeze the message. Logging of this is done later, just before the -H file is updated. */ if (addr->special_action == SPECIAL_FREEZE) { f.deliver_freeze = TRUE; deliver_frozen_at = time(NULL); update_spool = TRUE; } /* If doing a 2-stage queue run, we skip writing to either the message log or the main log for SMTP defers. */ if (!f.queue_2stage || addr->basic_errno != 0) deferral_log(addr, now, logflags, driver_name, driver_kind); } /* Hard failure. If there is an address to which an error message can be sent, put this address on the failed list. If not, put it on the deferred list and freeze the mail message for human attention. The latter action can also be explicitly requested by a router or transport. */ else { /* If this is a delivery error, or a message for which no replies are wanted, and the message's age is greater than ignore_bounce_errors_after, force the af_ignore_error flag. This will cause the address to be discarded later (with a log entry). */ if (!*sender_address && message_age >= ignore_bounce_errors_after) addr->prop.ignore_error = TRUE; /* Freeze the message if requested, or if this is a bounce message (or other message with null sender) and this address does not have its own errors address. However, don't freeze if errors are being ignored. The actual code to ignore occurs later, instead of sending a message. Logging of freezing occurs later, just before writing the -H file. */ if ( !addr->prop.ignore_error && ( addr->special_action == SPECIAL_FREEZE || (sender_address[0] == 0 && !addr->prop.errors_address) ) ) { frozen_info = addr->special_action == SPECIAL_FREEZE ? US"" : f.sender_local && !f.local_error_message ? US" (message created with -f <>)" : US" (delivery error message)"; f.deliver_freeze = TRUE; deliver_frozen_at = time(NULL); update_spool = TRUE; /* The address is put on the defer rather than the failed queue, because the message is being retained. */ addr->next = addr_defer; addr_defer = addr; } /* Don't put the address on the nonrecipients tree yet; wait until an error message has been successfully sent. */ else { addr->next = addr_failed; addr_failed = addr; } failure_log(addr, driver_name ? NULL : driver_kind, now); } /* Ensure logging is turned on again in all cases */ f.disable_logging = FALSE; } /************************************************* * Address-independent error * *************************************************/ /* This function is called when there's an error that is not dependent on a particular address, such as an expansion string failure. It puts the error into all the addresses in a batch, logs the incident on the main and panic logs, and clears the expansions. It is mostly called from local_deliver(), but can be called for a remote delivery via findugid(). Arguments: logit TRUE if (MAIN+PANIC) logging required addr the first of the chain of addresses code the error code format format string for error message, or NULL if already set in addr ... arguments for the format Returns: nothing */ static void common_error(BOOL logit, address_item *addr, int code, uschar *format, ...) { addr->basic_errno = code; if (format) { va_list ap; gstring * g; va_start(ap, format); g = string_vformat(NULL, SVFMT_EXTEND|SVFMT_REBUFFER, CS format, ap); va_end(ap); addr->message = string_from_gstring(g); } for (address_item * addr2 = addr->next; addr2; addr2 = addr2->next) { addr2->basic_errno = code; addr2->message = addr->message; } if (logit) log_write(0, LOG_MAIN|LOG_PANIC, "%s", addr->message); deliver_set_expansions(NULL); } /************************************************* * Check a "never users" list * *************************************************/ /* This function is called to check whether a uid is on one of the two "never users" lists. Arguments: uid the uid to be checked nusers the list to be scanned; the first item in the list is the count Returns: TRUE if the uid is on the list */ static BOOL check_never_users(uid_t uid, uid_t *nusers) { if (!nusers) return FALSE; for (int i = 1; i <= (int)(nusers[0]); i++) if (nusers[i] == uid) return TRUE; return FALSE; } /************************************************* * Find uid and gid for a transport * *************************************************/ /* This function is called for both local and remote deliveries, to find the uid/gid under which to run the delivery. The values are taken preferentially from the transport (either explicit or deliver_as_creator), then from the address (i.e. the router), and if nothing is set, the exim uid/gid are used. If the resulting uid is on the "never_users" or the "fixed_never_users" list, a panic error is logged, and the function fails (which normally leads to delivery deferral). Arguments: addr the address (possibly a chain) tp the transport uidp pointer to uid field gidp pointer to gid field igfp pointer to the use_initgroups field Returns: FALSE if failed - error has been set in address(es) */ static BOOL findugid(address_item *addr, transport_instance *tp, uid_t *uidp, gid_t *gidp, BOOL *igfp) { uschar *nuname; BOOL gid_set = FALSE; /* Default initgroups flag comes from the transport */ *igfp = tp->initgroups; /* First see if there's a gid on the transport, either fixed or expandable. The expanding function always logs failure itself. */ if (tp->gid_set) { *gidp = tp->gid; gid_set = TRUE; } else if (tp->expand_gid) { if (!route_find_expanded_group(tp->expand_gid, tp->name, US"transport", gidp, &(addr->message))) { common_error(FALSE, addr, ERRNO_GIDFAIL, NULL); return FALSE; } gid_set = TRUE; } /* If the transport did not set a group, see if the router did. */ if (!gid_set && testflag(addr, af_gid_set)) { *gidp = addr->gid; gid_set = TRUE; } /* Pick up a uid from the transport if one is set. */ if (tp->uid_set) *uidp = tp->uid; /* Otherwise, try for an expandable uid field. If it ends up as a numeric id, it does not provide a passwd value from which a gid can be taken. */ else if (tp->expand_uid) { struct passwd *pw; if (!route_find_expanded_user(tp->expand_uid, tp->name, US"transport", &pw, uidp, &(addr->message))) { common_error(FALSE, addr, ERRNO_UIDFAIL, NULL); return FALSE; } if (!gid_set && pw) { *gidp = pw->pw_gid; gid_set = TRUE; } } /* If the transport doesn't set the uid, test the deliver_as_creator flag. */ else if (tp->deliver_as_creator) { *uidp = originator_uid; if (!gid_set) { *gidp = originator_gid; gid_set = TRUE; } } /* Otherwise see if the address specifies the uid and if so, take it and its initgroups flag. */ else if (testflag(addr, af_uid_set)) { *uidp = addr->uid; *igfp = testflag(addr, af_initgroups); } /* Nothing has specified the uid - default to the Exim user, and group if the gid is not set. */ else { *uidp = exim_uid; if (!gid_set) { *gidp = exim_gid; gid_set = TRUE; } } /* If no gid is set, it is a disaster. We default to the Exim gid only if defaulting to the Exim uid. In other words, if the configuration has specified a uid, it must also provide a gid. */ if (!gid_set) { common_error(TRUE, addr, ERRNO_GIDFAIL, US"User set without group for " "%s transport", tp->name); return FALSE; } /* Check that the uid is not on the lists of banned uids that may not be used for delivery processes. */ nuname = check_never_users(*uidp, never_users) ? US"never_users" : check_never_users(*uidp, fixed_never_users) ? US"fixed_never_users" : NULL; if (nuname) { common_error(TRUE, addr, ERRNO_UIDFAIL, US"User %ld set for %s transport " "is on the %s list", (long int)(*uidp), tp->name, nuname); return FALSE; } /* All is well */ return TRUE; } /************************************************* * Check the size of a message for a transport * *************************************************/ /* Checks that the message isn't too big for the selected transport. This is called only when it is known that the limit is set. Arguments: tp the transport addr the (first) address being delivered Returns: OK DEFER expansion failed or did not yield an integer FAIL message too big */ int check_message_size(transport_instance *tp, address_item *addr) { int rc = OK; int size_limit; deliver_set_expansions(addr); size_limit = expand_string_integer(tp->message_size_limit, TRUE); deliver_set_expansions(NULL); if (expand_string_message) { rc = DEFER; addr->message = size_limit == -1 ? string_sprintf("failed to expand message_size_limit " "in %s transport: %s", tp->name, expand_string_message) : string_sprintf("invalid message_size_limit " "in %s transport: %s", tp->name, expand_string_message); } else if (size_limit > 0 && message_size > size_limit) { rc = FAIL; addr->message = string_sprintf("message is too big (transport limit = %d)", size_limit); } return rc; } /************************************************* * Transport-time check for a previous delivery * *************************************************/ /* Check that this base address hasn't previously been delivered to its routed transport. If it has been delivered, mark it done. The check is necessary at delivery time in order to handle homonymic addresses correctly in cases where the pattern of redirection changes between delivery attempts (so the unique fields change). Non-homonymic previous delivery is detected earlier, at routing time (which saves unnecessary routing). Arguments: addr the address item testing TRUE if testing wanted only, without side effects Returns: TRUE if previously delivered by the transport */ static BOOL previously_transported(address_item *addr, BOOL testing) { uschar * s = string_sprintf("%s/%s", addr->unique + (testflag(addr, af_homonym)? 3:0), addr->transport->name); if (tree_search(tree_nonrecipients, s) != 0) { DEBUG(D_deliver|D_route|D_transport) debug_printf("%s was previously delivered (%s transport): discarded\n", addr->address, addr->transport->name); if (!testing) child_done(addr, tod_stamp(tod_log)); return TRUE; } return FALSE; } /****************************************************** * Check for a given header in a header string * ******************************************************/ /* This function is used when generating quota warnings. The configuration may specify any header lines it likes in quota_warn_message. If certain of them are missing, defaults are inserted, so we need to be able to test for the presence of a given header. Arguments: hdr the required header name hstring the header string Returns: TRUE the header is in the string FALSE the header is not in the string */ static BOOL contains_header(uschar *hdr, uschar *hstring) { int len = Ustrlen(hdr); uschar *p = hstring; while (*p != 0) { if (strncmpic(p, hdr, len) == 0) { p += len; while (*p == ' ' || *p == '\t') p++; if (*p == ':') return TRUE; } while (*p != 0 && *p != '\n') p++; if (*p == '\n') p++; } return FALSE; } /************************************************* * Perform a local delivery * *************************************************/ /* Each local delivery is performed in a separate process which sets its uid and gid as specified. This is a safer way than simply changing and restoring using seteuid(); there is a body of opinion that seteuid() cannot be used safely. From release 4, Exim no longer makes any use of it. Besides, not all systems have seteuid(). If the uid/gid are specified in the transport_instance, they are used; the transport initialization must ensure that either both or neither are set. Otherwise, the values associated with the address are used. If neither are set, it is a configuration error. The transport or the address may specify a home directory (transport over- rides), and if they do, this is set as $home. If neither have set a working directory, this value is used for that as well. Otherwise $home is left unset and the cwd is set to "/" - a directory that should be accessible to all users. Using a separate process makes it more complicated to get error information back. We use a pipe to pass the return code and also an error code and error text string back to the parent process. Arguments: addr points to an address block for this delivery; for "normal" local deliveries this is the only address to be delivered, but for pseudo-remote deliveries (e.g. by batch SMTP to a file or pipe) a number of addresses can be handled simultaneously, and in this case addr will point to a chain of addresses with the same characteristics. shadowing TRUE if running a shadow transport; this causes output from pipes to be ignored. Returns: nothing */ static void deliver_local(address_item *addr, BOOL shadowing) { BOOL use_initgroups; uid_t uid; gid_t gid; int status, len, rc; int pfd[2]; pid_t pid; uschar *working_directory; address_item *addr2; transport_instance *tp = addr->transport; /* Set up the return path from the errors or sender address. If the transport has its own return path setting, expand it and replace the existing value. */ if(addr->prop.errors_address) return_path = addr->prop.errors_address; #ifdef EXPERIMENTAL_SRS else if (addr->prop.srs_sender) return_path = addr->prop.srs_sender; #endif else return_path = sender_address; if (tp->return_path) { uschar *new_return_path = expand_string(tp->return_path); if (!new_return_path) { if (!f.expand_string_forcedfail) { common_error(TRUE, addr, ERRNO_EXPANDFAIL, US"Failed to expand return path \"%s\" in %s transport: %s", tp->return_path, tp->name, expand_string_message); return; } } else return_path = new_return_path; } /* For local deliveries, one at a time, the value used for logging can just be set directly, once and for all. */ used_return_path = return_path; /* Sort out the uid, gid, and initgroups flag. If an error occurs, the message gets put into the address(es), and the expansions are unset, so we can just return. */ if (!findugid(addr, tp, &uid, &gid, &use_initgroups)) return; /* See if either the transport or the address specifies a home directory. A home directory set in the address may already be expanded; a flag is set to indicate that. In other cases we must expand it. */ if ( (deliver_home = tp->home_dir) /* Set in transport, or */ || ( (deliver_home = addr->home_dir) /* Set in address and */ && !testflag(addr, af_home_expanded) /* not expanded */ ) ) { uschar *rawhome = deliver_home; deliver_home = NULL; /* in case it contains $home */ if (!(deliver_home = expand_string(rawhome))) { common_error(TRUE, addr, ERRNO_EXPANDFAIL, US"home directory \"%s\" failed " "to expand for %s transport: %s", rawhome, tp->name, expand_string_message); return; } if (*deliver_home != '/') { common_error(TRUE, addr, ERRNO_NOTABSOLUTE, US"home directory path \"%s\" " "is not absolute for %s transport", deliver_home, tp->name); return; } } /* See if either the transport or the address specifies a current directory, and if so, expand it. If nothing is set, use the home directory, unless it is also unset in which case use "/", which is assumed to be a directory to which all users have access. It is necessary to be in a visible directory for some operating systems when running pipes, as some commands (e.g. "rm" under Solaris 2.5) require this. */ working_directory = tp->current_dir ? tp->current_dir : addr->current_dir; if (working_directory) { uschar *raw = working_directory; if (!(working_directory = expand_string(raw))) { common_error(TRUE, addr, ERRNO_EXPANDFAIL, US"current directory \"%s\" " "failed to expand for %s transport: %s", raw, tp->name, expand_string_message); return; } if (*working_directory != '/') { common_error(TRUE, addr, ERRNO_NOTABSOLUTE, US"current directory path " "\"%s\" is not absolute for %s transport", working_directory, tp->name); return; } } else working_directory = deliver_home ? deliver_home : US"/"; /* If one of the return_output flags is set on the transport, create and open a file in the message log directory for the transport to write its output onto. This is mainly used by pipe transports. The file needs to be unique to the address. This feature is not available for shadow transports. */ if ( !shadowing && ( tp->return_output || tp->return_fail_output || tp->log_output || tp->log_fail_output || tp->log_defer_output ) ) { uschar * error; addr->return_filename = spool_fname(US"msglog", message_subdir, message_id, string_sprintf("-%d-%d", getpid(), return_count++)); if ((addr->return_file = open_msglog_file(addr->return_filename, 0400, &error)) < 0) { common_error(TRUE, addr, errno, US"Unable to %s file for %s transport " "to return message: %s", error, tp->name, strerror(errno)); return; } } /* Create the pipe for inter-process communication. */ if (pipe(pfd) != 0) { common_error(TRUE, addr, ERRNO_PIPEFAIL, US"Creation of pipe failed: %s", strerror(errno)); return; } /* Now fork the process to do the real work in the subprocess, but first ensure that all cached resources are freed so that the subprocess starts with a clean slate and doesn't interfere with the parent process. */ search_tidyup(); if ((pid = fork()) == 0) { BOOL replicate = TRUE; /* Prevent core dumps, as we don't want them in users' home directories. HP-UX doesn't have RLIMIT_CORE; I don't know how to do this in that system. Some experimental/developing systems (e.g. GNU/Hurd) may define RLIMIT_CORE but not support it in setrlimit(). For such systems, do not complain if the error is "not supported". There are two scenarios where changing the max limit has an effect. In one, the user is using a .forward and invoking a command of their choice via pipe; for these, we do need the max limit to be 0 unless the admin chooses to permit an increased limit. In the other, the command is invoked directly by the transport and is under administrator control, thus being able to raise the limit aids in debugging. So there's no general always-right answer. Thus we inhibit core-dumps completely but let individual transports, while still root, re-raise the limits back up to aid debugging. We make the default be no core-dumps -- few enough people can use core dumps in diagnosis that it's reasonable to make them something that has to be explicitly requested. */ #ifdef RLIMIT_CORE struct rlimit rl; rl.rlim_cur = 0; rl.rlim_max = 0; if (setrlimit(RLIMIT_CORE, &rl) < 0) { # ifdef SETRLIMIT_NOT_SUPPORTED if (errno != ENOSYS && errno != ENOTSUP) # endif log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_CORE) failed: %s", strerror(errno)); } #endif /* Reset the random number generator, so different processes don't all have the same sequence. */ random_seed = 0; /* If the transport has a setup entry, call this first, while still privileged. (Appendfile uses this to expand quota, for example, while able to read private files.) */ if (addr->transport->setup) switch((addr->transport->setup)(addr->transport, addr, NULL, uid, gid, &(addr->message))) { case DEFER: addr->transport_return = DEFER; goto PASS_BACK; case FAIL: addr->transport_return = PANIC; goto PASS_BACK; } /* Ignore SIGINT and SIGTERM during delivery. Also ignore SIGUSR1, as when the process becomes unprivileged, it won't be able to write to the process log. SIGHUP is ignored throughout exim, except when it is being run as a daemon. */ signal(SIGINT, SIG_IGN); signal(SIGTERM, SIG_IGN); signal(SIGUSR1, SIG_IGN); /* Close the unwanted half of the pipe, and set close-on-exec for the other half - for transports that exec things (e.g. pipe). Then set the required gid/uid. */ (void)close(pfd[pipe_read]); (void)fcntl(pfd[pipe_write], F_SETFD, fcntl(pfd[pipe_write], F_GETFD) | FD_CLOEXEC); exim_setugid(uid, gid, use_initgroups, string_sprintf("local delivery to %s <%s> transport=%s", addr->local_part, addr->address, addr->transport->name)); DEBUG(D_deliver) { debug_printf(" home=%s current=%s\n", deliver_home, working_directory); for (address_item * batched = addr->next; batched; batched = batched->next) debug_printf("additional batched address: %s\n", batched->address); } /* Set an appropriate working directory. */ if (Uchdir(working_directory) < 0) { addr->transport_return = DEFER; addr->basic_errno = errno; addr->message = string_sprintf("failed to chdir to %s", working_directory); } /* If successful, call the transport */ else { BOOL ok = TRUE; set_process_info("delivering %s to %s using %s", message_id, addr->local_part, addr->transport->name); /* Setting this global in the subprocess means we need never clear it */ transport_name = addr->transport->name; /* If a transport filter has been specified, set up its argument list. Any errors will get put into the address, and FALSE yielded. */ if (addr->transport->filter_command) { ok = transport_set_up_command(&transport_filter_argv, addr->transport->filter_command, TRUE, PANIC, addr, US"transport filter", NULL); transport_filter_timeout = addr->transport->filter_timeout; } else transport_filter_argv = NULL; if (ok) { debug_print_string(addr->transport->debug_string); replicate = !(addr->transport->info->code)(addr->transport, addr); } } /* Pass the results back down the pipe. If necessary, first replicate the status in the top address to the others in the batch. The label is the subject of a goto when a call to the transport's setup function fails. We pass the pointer to the transport back in case it got changed as a result of file_format in appendfile. */ PASS_BACK: if (replicate) replicate_status(addr); for (addr2 = addr; addr2; addr2 = addr2->next) { int i; int local_part_length = Ustrlen(addr2->local_part); uschar *s; int ret; if( (ret = write(pfd[pipe_write], &addr2->transport_return, sizeof(int))) != sizeof(int) || (ret = write(pfd[pipe_write], &transport_count, sizeof(transport_count))) != sizeof(transport_count) || (ret = write(pfd[pipe_write], &addr2->flags, sizeof(addr2->flags))) != sizeof(addr2->flags) || (ret = write(pfd[pipe_write], &addr2->basic_errno, sizeof(int))) != sizeof(int) || (ret = write(pfd[pipe_write], &addr2->more_errno, sizeof(int))) != sizeof(int) || (ret = write(pfd[pipe_write], &addr2->delivery_usec, sizeof(int))) != sizeof(int) || (ret = write(pfd[pipe_write], &addr2->special_action, sizeof(int))) != sizeof(int) || (ret = write(pfd[pipe_write], &addr2->transport, sizeof(transport_instance *))) != sizeof(transport_instance *) /* For a file delivery, pass back the local part, in case the original was only part of the final delivery path. This gives more complete logging. */ || (testflag(addr2, af_file) && ( (ret = write(pfd[pipe_write], &local_part_length, sizeof(int))) != sizeof(int) || (ret = write(pfd[pipe_write], addr2->local_part, local_part_length)) != local_part_length ) ) ) log_write(0, LOG_MAIN|LOG_PANIC, "Failed writing transport results to pipe: %s", ret == -1 ? strerror(errno) : "short write"); /* Now any messages */ for (i = 0, s = addr2->message; i < 2; i++, s = addr2->user_message) { int message_length = s ? Ustrlen(s) + 1 : 0; if( (ret = write(pfd[pipe_write], &message_length, sizeof(int))) != sizeof(int) || message_length > 0 && (ret = write(pfd[pipe_write], s, message_length)) != message_length ) log_write(0, LOG_MAIN|LOG_PANIC, "Failed writing transport results to pipe: %s", ret == -1 ? strerror(errno) : "short write"); } } /* OK, this process is now done. Free any cached resources that it opened, and close the pipe we were writing down before exiting. */ (void)close(pfd[pipe_write]); search_tidyup(); exit(EXIT_SUCCESS); } /* Back in the main process: panic if the fork did not succeed. This seems better than returning an error - if forking is failing it is probably best not to try other deliveries for this message. */ if (pid < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Fork failed for local delivery to %s", addr->address); /* Read the pipe to get the delivery status codes and error messages. Our copy of the writing end must be closed first, as otherwise read() won't return zero on an empty pipe. We check that a status exists for each address before overwriting the address structure. If data is missing, the default DEFER status will remain. Afterwards, close the reading end. */ (void)close(pfd[pipe_write]); for (addr2 = addr; addr2; addr2 = addr2->next) { if ((len = read(pfd[pipe_read], &status, sizeof(int))) > 0) { int i; uschar **sptr; addr2->transport_return = status; len = read(pfd[pipe_read], &transport_count, sizeof(transport_count)); len = read(pfd[pipe_read], &addr2->flags, sizeof(addr2->flags)); len = read(pfd[pipe_read], &addr2->basic_errno, sizeof(int)); len = read(pfd[pipe_read], &addr2->more_errno, sizeof(int)); len = read(pfd[pipe_read], &addr2->delivery_usec, sizeof(int)); len = read(pfd[pipe_read], &addr2->special_action, sizeof(int)); len = read(pfd[pipe_read], &addr2->transport, sizeof(transport_instance *)); if (testflag(addr2, af_file)) { int llen; if ( read(pfd[pipe_read], &llen, sizeof(int)) != sizeof(int) || llen > 64*4 /* limit from rfc 5821, times I18N factor */ ) { log_write(0, LOG_MAIN|LOG_PANIC, "bad local_part length read" " from delivery subprocess"); break; } /* sanity-checked llen so disable the Coverity error */ /* coverity[tainted_data] */ if (read(pfd[pipe_read], big_buffer, llen) != llen) { log_write(0, LOG_MAIN|LOG_PANIC, "bad local_part read" " from delivery subprocess"); break; } big_buffer[llen] = 0; addr2->local_part = string_copy(big_buffer); } for (i = 0, sptr = &addr2->message; i < 2; i++, sptr = &addr2->user_message) { int message_length; len = read(pfd[pipe_read], &message_length, sizeof(int)); if (message_length > 0) { len = read(pfd[pipe_read], big_buffer, message_length); big_buffer[big_buffer_size-1] = '\0'; /* guard byte */ if (len > 0) *sptr = string_copy(big_buffer); } } } else { log_write(0, LOG_MAIN|LOG_PANIC, "failed to read delivery status for %s " "from delivery subprocess", addr2->unique); break; } } (void)close(pfd[pipe_read]); /* Unless shadowing, write all successful addresses immediately to the journal file, to ensure they are recorded asap. For homonymic addresses, use the base address plus the transport name. Failure to write the journal is panic-worthy, but don't stop, as it may prove possible subsequently to update the spool file in order to record the delivery. */ if (!shadowing) { for (addr2 = addr; addr2; addr2 = addr2->next) if (addr2->transport_return == OK) { if (testflag(addr2, af_homonym)) sprintf(CS big_buffer, "%.500s/%s\n", addr2->unique + 3, tp->name); else sprintf(CS big_buffer, "%.500s\n", addr2->unique); /* In the test harness, wait just a bit to let the subprocess finish off any debug output etc first. */ if (f.running_in_test_harness) millisleep(300); DEBUG(D_deliver) debug_printf("journalling %s", big_buffer); len = Ustrlen(big_buffer); if (write(journal_fd, big_buffer, len) != len) log_write(0, LOG_MAIN|LOG_PANIC, "failed to update journal for %s: %s", big_buffer, strerror(errno)); } /* Ensure the journal file is pushed out to disk. */ if (EXIMfsync(journal_fd) < 0) log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", strerror(errno)); } /* Wait for the process to finish. If it terminates with a non-zero code, freeze the message (except for SIGTERM, SIGKILL and SIGQUIT), but leave the status values of all the addresses as they are. Take care to handle the case when the subprocess doesn't seem to exist. This has been seen on one system when Exim was called from an MUA that set SIGCHLD to SIG_IGN. When that happens, wait() doesn't recognize the termination of child processes. Exim now resets SIGCHLD to SIG_DFL, but this code should still be robust. */ while ((rc = wait(&status)) != pid) if (rc < 0 && errno == ECHILD) /* Process has vanished */ { log_write(0, LOG_MAIN, "%s transport process vanished unexpectedly", addr->transport->driver_name); status = 0; break; } if ((status & 0xffff) != 0) { int msb = (status >> 8) & 255; int lsb = status & 255; int code = (msb == 0)? (lsb & 0x7f) : msb; if (msb != 0 || (code != SIGTERM && code != SIGKILL && code != SIGQUIT)) addr->special_action = SPECIAL_FREEZE; log_write(0, LOG_MAIN|LOG_PANIC, "%s transport process returned non-zero " "status 0x%04x: %s %d", addr->transport->driver_name, status, msb == 0 ? "terminated by signal" : "exit code", code); } /* If SPECIAL_WARN is set in the top address, send a warning message. */ if (addr->special_action == SPECIAL_WARN && addr->transport->warn_message) { int fd; uschar *warn_message; pid_t pid; DEBUG(D_deliver) debug_printf("Warning message requested by transport\n"); if (!(warn_message = expand_string(addr->transport->warn_message))) log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand \"%s\" (warning " "message for %s transport): %s", addr->transport->warn_message, addr->transport->name, expand_string_message); else if ((pid = child_open_exim(&fd)) > 0) { FILE *f = fdopen(fd, "wb"); if (errors_reply_to && !contains_header(US"Reply-To", warn_message)) fprintf(f, "Reply-To: %s\n", errors_reply_to); fprintf(f, "Auto-Submitted: auto-replied\n"); if (!contains_header(US"From", warn_message)) moan_write_from(f); fprintf(f, "%s", CS warn_message); /* Close and wait for child process to complete, without a timeout. */ (void)fclose(f); (void)child_close(pid, 0); } addr->special_action = SPECIAL_NONE; } } /* Check transport for the given concurrency limit. Return TRUE if over the limit (or an expansion failure), else FALSE and if there was a limit, the key for the hints database used for the concurrency count. */ static BOOL tpt_parallel_check(transport_instance * tp, address_item * addr, uschar ** key) { unsigned max_parallel; if (!tp->max_parallel) return FALSE; max_parallel = (unsigned) expand_string_integer(tp->max_parallel, TRUE); if (expand_string_message) { log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand max_parallel option " "in %s transport (%s): %s", tp->name, addr->address, expand_string_message); return TRUE; } if (max_parallel > 0) { uschar * serialize_key = string_sprintf("tpt-serialize-%s", tp->name); if (!enq_start(serialize_key, max_parallel)) { address_item * next; DEBUG(D_transport) debug_printf("skipping tpt %s because concurrency limit %u reached\n", tp->name, max_parallel); do { next = addr->next; addr->message = US"concurrency limit reached for transport"; addr->basic_errno = ERRNO_TRETRY; post_process_one(addr, DEFER, LOG_MAIN, EXIM_DTYPE_TRANSPORT, 0); } while ((addr = next)); return TRUE; } *key = serialize_key; } return FALSE; } /************************************************* * Do local deliveries * *************************************************/ /* This function processes the list of addresses in addr_local. True local deliveries are always done one address at a time. However, local deliveries can be batched up in some cases. Typically this is when writing batched SMTP output files for use by some external transport mechanism, or when running local deliveries over LMTP. Arguments: None Returns: Nothing */ static void do_local_deliveries(void) { open_db dbblock; open_db *dbm_file = NULL; time_t now = time(NULL); /* Loop until we have exhausted the supply of local deliveries */ while (addr_local) { struct timeval delivery_start; struct timeval deliver_time; address_item *addr2, *addr3, *nextaddr; int logflags = LOG_MAIN; int logchar = f.dont_deliver? '*' : '='; transport_instance *tp; uschar * serialize_key = NULL; /* Pick the first undelivered address off the chain */ address_item *addr = addr_local; addr_local = addr->next; addr->next = NULL; DEBUG(D_deliver|D_transport) debug_printf("--------> %s <--------\n", addr->address); /* An internal disaster if there is no transport. Should not occur! */ if (!(tp = addr->transport)) { logflags |= LOG_PANIC; f.disable_logging = FALSE; /* Jic */ addr->message = addr->router ? string_sprintf("No transport set by %s router", addr->router->name) : US"No transport set by system filter"; post_process_one(addr, DEFER, logflags, EXIM_DTYPE_TRANSPORT, 0); continue; } /* Check that this base address hasn't previously been delivered to this transport. The check is necessary at this point to handle homonymic addresses correctly in cases where the pattern of redirection changes between delivery attempts. Non-homonymic previous delivery is detected earlier, at routing time. */ if (previously_transported(addr, FALSE)) continue; /* There are weird cases where logging is disabled */ f.disable_logging = tp->disable_logging; /* Check for batched addresses and possible amalgamation. Skip all the work if either batch_max <= 1 or there aren't any other addresses for local delivery. */ if (tp->batch_max > 1 && addr_local) { int batch_count = 1; BOOL uses_dom = readconf_depends((driver_instance *)tp, US"domain"); BOOL uses_lp = ( testflag(addr, af_pfr) && (testflag(addr, af_file) || addr->local_part[0] == '|') ) || readconf_depends((driver_instance *)tp, US"local_part"); uschar *batch_id = NULL; address_item **anchor = &addr_local; address_item *last = addr; address_item *next; /* Expand the batch_id string for comparison with other addresses. Expansion failure suppresses batching. */ if (tp->batch_id) { deliver_set_expansions(addr); batch_id = expand_string(tp->batch_id); deliver_set_expansions(NULL); if (!batch_id) { log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand batch_id option " "in %s transport (%s): %s", tp->name, addr->address, expand_string_message); batch_count = tp->batch_max; } } /* Until we reach the batch_max limit, pick off addresses which have the same characteristics. These are: same transport not previously delivered (see comment about 50 lines above) same local part if the transport's configuration contains $local_part or if this is a file or pipe delivery from a redirection same domain if the transport's configuration contains $domain same errors address same additional headers same headers to be removed same uid/gid for running the transport same first host if a host list is set */ while ((next = *anchor) && batch_count < tp->batch_max) { BOOL ok = tp == next->transport && !previously_transported(next, TRUE) && testflag(addr, af_pfr) == testflag(next, af_pfr) && testflag(addr, af_file) == testflag(next, af_file) && (!uses_lp || Ustrcmp(next->local_part, addr->local_part) == 0) && (!uses_dom || Ustrcmp(next->domain, addr->domain) == 0) && same_strings(next->prop.errors_address, addr->prop.errors_address) && same_headers(next->prop.extra_headers, addr->prop.extra_headers) && same_strings(next->prop.remove_headers, addr->prop.remove_headers) && same_ugid(tp, addr, next) && ( !addr->host_list && !next->host_list || addr->host_list && next->host_list && Ustrcmp(addr->host_list->name, next->host_list->name) == 0 ); /* If the transport has a batch_id setting, batch_id will be non-NULL from the expansion outside the loop. Expand for this address and compare. Expansion failure makes this address ineligible for batching. */ if (ok && batch_id) { uschar *bid; address_item *save_nextnext = next->next; next->next = NULL; /* Expansion for a single address */ deliver_set_expansions(next); next->next = save_nextnext; bid = expand_string(tp->batch_id); deliver_set_expansions(NULL); if (!bid) { log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand batch_id option " "in %s transport (%s): %s", tp->name, next->address, expand_string_message); ok = FALSE; } else ok = (Ustrcmp(batch_id, bid) == 0); } /* Take address into batch if OK. */ if (ok) { *anchor = next->next; /* Include the address */ next->next = NULL; last->next = next; last = next; batch_count++; } else anchor = &next->next; /* Skip the address */ } } /* We now have one or more addresses that can be delivered in a batch. Check whether the transport is prepared to accept a message of this size. If not, fail them all forthwith. If the expansion fails, or does not yield an integer, defer delivery. */ if (tp->message_size_limit) { int rc = check_message_size(tp, addr); if (rc != OK) { replicate_status(addr); while (addr) { addr2 = addr->next; post_process_one(addr, rc, logflags, EXIM_DTYPE_TRANSPORT, 0); addr = addr2; } continue; /* With next batch of addresses */ } } /* If we are not running the queue, or if forcing, all deliveries will be attempted. Otherwise, we must respect the retry times for each address. Even when not doing this, we need to set up the retry key string, and determine whether a retry record exists, because after a successful delivery, a delete retry item must be set up. Keep the retry database open only for the duration of these checks, rather than for all local deliveries, because some local deliveries (e.g. to pipes) can take a substantial time. */ if (!(dbm_file = dbfn_open(US"retry", O_RDONLY, &dbblock, FALSE, TRUE))) { DEBUG(D_deliver|D_retry|D_hints_lookup) debug_printf("no retry data available\n"); } addr2 = addr; addr3 = NULL; while (addr2) { BOOL ok = TRUE; /* to deliver this address */ uschar *retry_key; /* Set up the retry key to include the domain or not, and change its leading character from "R" to "T". Must make a copy before doing this, because the old key may be pointed to from a "delete" retry item after a routing delay. */ retry_key = string_copy( tp->retry_use_local_part ? addr2->address_retry_key : addr2->domain_retry_key); *retry_key = 'T'; /* Inspect the retry data. If there is no hints file, delivery happens. */ if (dbm_file) { dbdata_retry *retry_record = dbfn_read(dbm_file, retry_key); /* If there is no retry record, delivery happens. If there is, remember it exists so it can be deleted after a successful delivery. */ if (retry_record) { setflag(addr2, af_lt_retry_exists); /* A retry record exists for this address. If queue running and not forcing, inspect its contents. If the record is too old, or if its retry time has come, or if it has passed its cutoff time, delivery will go ahead. */ DEBUG(D_retry) { debug_printf("retry record exists: age=%s ", readconf_printtime(now - retry_record->time_stamp)); debug_printf("(max %s)\n", readconf_printtime(retry_data_expire)); debug_printf(" time to retry = %s expired = %d\n", readconf_printtime(retry_record->next_try - now), retry_record->expired); } if (f.queue_running && !f.deliver_force) { ok = (now - retry_record->time_stamp > retry_data_expire) || (now >= retry_record->next_try) || retry_record->expired; /* If we haven't reached the retry time, there is one more check to do, which is for the ultimate address timeout. */ if (!ok) ok = retry_ultimate_address_timeout(retry_key, addr2->domain, retry_record, now); } } else DEBUG(D_retry) debug_printf("no retry record exists\n"); } /* This address is to be delivered. Leave it on the chain. */ if (ok) { addr3 = addr2; addr2 = addr2->next; } /* This address is to be deferred. Take it out of the chain, and post-process it as complete. Must take it out of the chain first, because post processing puts it on another chain. */ else { address_item *this = addr2; this->message = US"Retry time not yet reached"; this->basic_errno = ERRNO_LRETRY; addr2 = addr3 ? (addr3->next = addr2->next) : (addr = addr2->next); post_process_one(this, DEFER, logflags, EXIM_DTYPE_TRANSPORT, 0); } } if (dbm_file) dbfn_close(dbm_file); /* If there are no addresses left on the chain, they all deferred. Loop for the next set of addresses. */ if (!addr) continue; /* If the transport is limited for parallellism, enforce that here. We use a hints DB entry, incremented here and decremented after the transport (and any shadow transport) completes. */ if (tpt_parallel_check(tp, addr, &serialize_key)) { if (expand_string_message) { logflags |= LOG_PANIC; do { addr = addr->next; post_process_one(addr, DEFER, logflags, EXIM_DTYPE_TRANSPORT, 0); } while ((addr = addr2)); } continue; /* Loop for the next set of addresses. */ } /* So, finally, we do have some addresses that can be passed to the transport. Before doing so, set up variables that are relevant to a single delivery. */ deliver_set_expansions(addr); gettimeofday(&delivery_start, NULL); deliver_local(addr, FALSE); timesince(&deliver_time, &delivery_start); /* If a shadow transport (which must perforce be another local transport), is defined, and its condition is met, we must pass the message to the shadow too, but only those addresses that succeeded. We do this by making a new chain of addresses - also to keep the original chain uncontaminated. We must use a chain rather than doing it one by one, because the shadow transport may batch. NOTE: if the condition fails because of a lookup defer, there is nothing we can do! */ if ( tp->shadow && ( !tp->shadow_condition || expand_check_condition(tp->shadow_condition, tp->name, US"transport") ) ) { transport_instance *stp; address_item *shadow_addr = NULL; address_item **last = &shadow_addr; for (stp = transports; stp; stp = stp->next) if (Ustrcmp(stp->name, tp->shadow) == 0) break; if (!stp) log_write(0, LOG_MAIN|LOG_PANIC, "shadow transport \"%s\" not found ", tp->shadow); /* Pick off the addresses that have succeeded, and make clones. Put into the shadow_message field a pointer to the shadow_message field of the real address. */ else for (addr2 = addr; addr2; addr2 = addr2->next) if (addr2->transport_return == OK) { addr3 = store_get(sizeof(address_item), FALSE); *addr3 = *addr2; addr3->next = NULL; addr3->shadow_message = US &addr2->shadow_message; addr3->transport = stp; addr3->transport_return = DEFER; addr3->return_filename = NULL; addr3->return_file = -1; *last = addr3; last = &addr3->next; } /* If we found any addresses to shadow, run the delivery, and stick any message back into the shadow_message field in the original. */ if (shadow_addr) { int save_count = transport_count; DEBUG(D_deliver|D_transport) debug_printf(">>>>>>>>>>>>>>>> Shadow delivery >>>>>>>>>>>>>>>>\n"); deliver_local(shadow_addr, TRUE); for(; shadow_addr; shadow_addr = shadow_addr->next) { int sresult = shadow_addr->transport_return; *(uschar **)shadow_addr->shadow_message = sresult == OK ? string_sprintf(" ST=%s", stp->name) : string_sprintf(" ST=%s (%s%s%s)", stp->name, shadow_addr->basic_errno <= 0 ? US"" : US strerror(shadow_addr->basic_errno), shadow_addr->basic_errno <= 0 || !shadow_addr->message ? US"" : US": ", shadow_addr->message ? shadow_addr->message : shadow_addr->basic_errno <= 0 ? US"unknown error" : US""); DEBUG(D_deliver|D_transport) debug_printf("%s shadow transport returned %s for %s\n", stp->name, rc_to_string(sresult), shadow_addr->address); } DEBUG(D_deliver|D_transport) debug_printf(">>>>>>>>>>>>>>>> End shadow delivery >>>>>>>>>>>>>>>>\n"); transport_count = save_count; /* Restore original transport count */ } } /* Cancel the expansions that were set up for the delivery. */ deliver_set_expansions(NULL); /* If the transport was parallelism-limited, decrement the hints DB record. */ if (serialize_key) enq_end(serialize_key); /* Now we can process the results of the real transport. We must take each address off the chain first, because post_process_one() puts it on another chain. */ for (addr2 = addr; addr2; addr2 = nextaddr) { int result = addr2->transport_return; nextaddr = addr2->next; DEBUG(D_deliver|D_transport) debug_printf("%s transport returned %s for %s\n", tp->name, rc_to_string(result), addr2->address); /* If there is a retry_record, or if delivery is deferred, build a retry item for setting a new retry time or deleting the old retry record from the database. These items are handled all together after all addresses have been handled (so the database is open just for a short time for updating). */ if (result == DEFER || testflag(addr2, af_lt_retry_exists)) { int flags = result == DEFER ? 0 : rf_delete; uschar *retry_key = string_copy(tp->retry_use_local_part ? addr2->address_retry_key : addr2->domain_retry_key); *retry_key = 'T'; retry_add_item(addr2, retry_key, flags); } /* Done with this address */ if (result == OK) { addr2->more_errno = deliver_time.tv_sec; addr2->delivery_usec = deliver_time.tv_usec; } post_process_one(addr2, result, logflags, EXIM_DTYPE_TRANSPORT, logchar); /* If a pipe delivery generated text to be sent back, the result may be changed to FAIL, and we must copy this for subsequent addresses in the batch. */ if (addr2->transport_return != result) { for (addr3 = nextaddr; addr3; addr3 = addr3->next) { addr3->transport_return = addr2->transport_return; addr3->basic_errno = addr2->basic_errno; addr3->message = addr2->message; } result = addr2->transport_return; } /* Whether or not the result was changed to FAIL, we need to copy the return_file value from the first address into all the addresses of the batch, so they are all listed in the error message. */ addr2->return_file = addr->return_file; /* Change log character for recording successful deliveries. */ if (result == OK) logchar = '-'; } } /* Loop back for next batch of addresses */ } /************************************************* * Sort remote deliveries * *************************************************/ /* This function is called if remote_sort_domains is set. It arranges that the chain of addresses for remote deliveries is ordered according to the strings specified. Try to make this shuffling reasonably efficient by handling sequences of addresses rather than just single ones. Arguments: None Returns: Nothing */ static void sort_remote_deliveries(void) { int sep = 0; address_item **aptr = &addr_remote; const uschar *listptr = remote_sort_domains; uschar *pattern; uschar patbuf[256]; while ( *aptr && (pattern = string_nextinlist(&listptr, &sep, patbuf, sizeof(patbuf))) ) { address_item *moved = NULL; address_item **bptr = &moved; while (*aptr) { address_item **next; deliver_domain = (*aptr)->domain; /* set $domain */ if (match_isinlist(deliver_domain, (const uschar **)&pattern, UCHAR_MAX+1, &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK) { aptr = &(*aptr)->next; continue; } next = &(*aptr)->next; while ( *next && (deliver_domain = (*next)->domain, /* Set $domain */ match_isinlist(deliver_domain, (const uschar **)&pattern, UCHAR_MAX+1, &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL)) != OK ) next = &(*next)->next; /* If the batch of non-matchers is at the end, add on any that were extracted further up the chain, and end this iteration. Otherwise, extract them from the chain and hang on the moved chain. */ if (!*next) { *next = moved; break; } *bptr = *aptr; *aptr = *next; *next = NULL; bptr = next; aptr = &(*aptr)->next; } /* If the loop ended because the final address matched, *aptr will be NULL. Add on to the end any extracted non-matching addresses. If *aptr is not NULL, the loop ended via "break" when *next is null, that is, there was a string of non-matching addresses at the end. In this case the extracted addresses have already been added on the end. */ if (!*aptr) *aptr = moved; } DEBUG(D_deliver) { debug_printf("remote addresses after sorting:\n"); for (address_item * addr = addr_remote; addr; addr = addr->next) debug_printf(" %s\n", addr->address); } } /************************************************* * Read from pipe for remote delivery subprocess * *************************************************/ /* This function is called when the subprocess is complete, but can also be called before it is complete, in order to empty a pipe that is full (to prevent deadlock). It must therefore keep track of its progress in the parlist data block. We read the pipe to get the delivery status codes and a possible error message for each address, optionally preceded by unusability data for the hosts and also by optional retry data. Read in large chunks into the big buffer and then scan through, interpreting the data therein. In most cases, only a single read will be necessary. No individual item will ever be anywhere near 2500 bytes in length, so by ensuring that we read the next chunk when there is less than 2500 bytes left in the non-final chunk, we can assume each item is complete in the buffer before handling it. Each item is written using a single write(), which is atomic for small items (less than PIPE_BUF, which seems to be at least 512 in any Unix and often bigger) so even if we are reading while the subprocess is still going, we should never have only a partial item in the buffer. hs12: This assumption is not true anymore, since we get quite large items (certificate information and such). Argument: poffset the offset of the parlist item eop TRUE if the process has completed Returns: TRUE if the terminating 'Z' item has been read, or there has been a disaster (i.e. no more data needed); FALSE otherwise */ static BOOL par_read_pipe(int poffset, BOOL eop) { host_item *h; pardata *p = parlist + poffset; address_item *addrlist = p->addrlist; address_item *addr = p->addr; pid_t pid = p->pid; int fd = p->fd; uschar *msg = p->msg; BOOL done = p->done; /* Loop through all items, reading from the pipe when necessary. The pipe used to be non-blocking. But I do not see a reason for using non-blocking I/O here, as the preceding select() tells us, if data is available for reading. A read() on a "selected" handle should never block, but(!) it may return less data then we expected. (The buffer size we pass to read() shouldn't be understood as a "request", but as a "limit".) Each separate item is written to the pipe in a timely manner. But, especially for larger items, the read(2) may already return partial data from the write(2). The write is atomic mostly (depending on the amount written), but atomic does not imply "all or noting", it just is "not intermixed" with other writes on the same channel (pipe). */ DEBUG(D_deliver) debug_printf("reading pipe for subprocess %d (%s)\n", (int)p->pid, eop? "ended" : "not ended yet"); while (!done) { retry_item *r, **rp; uschar pipeheader[PIPE_HEADER_SIZE+1]; uschar *id = &pipeheader[0]; uschar *subid = &pipeheader[1]; uschar *ptr = big_buffer; size_t required = PIPE_HEADER_SIZE; /* first the pipehaeder, later the data */ ssize_t got; DEBUG(D_deliver) debug_printf( "expect %lu bytes (pipeheader) from tpt process %d\n", (u_long)required, pid); /* We require(!) all the PIPE_HEADER_SIZE bytes here, as we know, they're written in a timely manner, so waiting for the write shouldn't hurt a lot. If we get less, we can assume the subprocess do be done and do not expect any further information from it. */ if ((got = readn(fd, pipeheader, required)) != required) { msg = string_sprintf("got " SSIZE_T_FMT " of %d bytes (pipeheader) " "from transport process %d for transport %s", got, PIPE_HEADER_SIZE, pid, addr->transport->driver_name); done = TRUE; break; } pipeheader[PIPE_HEADER_SIZE] = '\0'; DEBUG(D_deliver) debug_printf("got %ld bytes (pipeheader) from transport process %d\n", (long) got, pid); { /* If we can't decode the pipeheader, the subprocess seems to have a problem, we do not expect any furher information from it. */ char *endc; required = Ustrtol(pipeheader+2, &endc, 10); if (*endc) { msg = string_sprintf("failed to read pipe " "from transport process %d for transport %s: error decoding size from header", pid, addr->transport->driver_name); done = TRUE; break; } } DEBUG(D_deliver) debug_printf("expect %lu bytes (pipedata) from transport process %d\n", (u_long)required, pid); /* Same as above, the transport process will write the bytes announced in a timely manner, so we can just wait for the bytes, getting less than expected is considered a problem of the subprocess, we do not expect anything else from it. */ if ((got = readn(fd, big_buffer, required)) != required) { msg = string_sprintf("got only " SSIZE_T_FMT " of " SIZE_T_FMT " bytes (pipedata) from transport process %d for transport %s", got, required, pid, addr->transport->driver_name); done = TRUE; break; } /* Handle each possible type of item, assuming the complete item is available in store. */ switch (*id) { /* Host items exist only if any hosts were marked unusable. Match up by checking the IP address. */ case 'H': for (h = addrlist->host_list; h; h = h->next) { if (!h->address || Ustrcmp(h->address, ptr+2) != 0) continue; h->status = ptr[0]; h->why = ptr[1]; } ptr += 2; while (*ptr++); break; /* Retry items are sent in a preceding R item for each address. This is kept separate to keep each message short enough to guarantee it won't be split in the pipe. Hopefully, in the majority of cases, there won't in fact be any retry items at all. The complete set of retry items might include an item to delete a routing retry if there was a previous routing delay. However, routing retries are also used when a remote transport identifies an address error. In that case, there may also be an "add" item for the same key. Arrange that a "delete" item is dropped in favour of an "add" item. */ case 'R': if (!addr) goto ADDR_MISMATCH; DEBUG(D_deliver|D_retry) debug_printf("reading retry information for %s from subprocess\n", ptr+1); /* Cut out any "delete" items on the list. */ for (rp = &addr->retries; (r = *rp); rp = &r->next) if (Ustrcmp(r->key, ptr+1) == 0) /* Found item with same key */ { if (!(r->flags & rf_delete)) break; /* It was not "delete" */ *rp = r->next; /* Excise a delete item */ DEBUG(D_deliver|D_retry) debug_printf(" existing delete item dropped\n"); } /* We want to add a delete item only if there is no non-delete item; however we still have to step ptr through the data. */ if (!r || !(*ptr & rf_delete)) { r = store_get(sizeof(retry_item), FALSE); r->next = addr->retries; addr->retries = r; r->flags = *ptr++; r->key = string_copy(ptr); while (*ptr++); memcpy(&r->basic_errno, ptr, sizeof(r->basic_errno)); ptr += sizeof(r->basic_errno); memcpy(&r->more_errno, ptr, sizeof(r->more_errno)); ptr += sizeof(r->more_errno); r->message = *ptr ? string_copy(ptr) : NULL; DEBUG(D_deliver|D_retry) debug_printf(" added %s item\n", r->flags & rf_delete ? "delete" : "retry"); } else { DEBUG(D_deliver|D_retry) debug_printf(" delete item not added: non-delete item exists\n"); ptr++; while(*ptr++); ptr += sizeof(r->basic_errno) + sizeof(r->more_errno); } while(*ptr++); break; /* Put the amount of data written into the parlist block */ case 'S': memcpy(&(p->transport_count), ptr, sizeof(transport_count)); ptr += sizeof(transport_count); break; /* Address items are in the order of items on the address chain. We remember the current address value in case this function is called several times to empty the pipe in stages. Information about delivery over TLS is sent in a preceding X item for each address. We don't put it in with the other info, in order to keep each message short enough to guarantee it won't be split in the pipe. */ #ifndef DISABLE_TLS case 'X': if (!addr) goto ADDR_MISMATCH; /* Below, in 'A' handler */ switch (*subid) { case '1': addr->cipher = NULL; addr->peerdn = NULL; if (*ptr) addr->cipher = string_copy(ptr); while (*ptr++); if (*ptr) addr->peerdn = string_copy(ptr); break; case '2': if (*ptr) (void) tls_import_cert(ptr, &addr->peercert); else addr->peercert = NULL; break; case '3': if (*ptr) (void) tls_import_cert(ptr, &addr->ourcert); else addr->ourcert = NULL; break; # ifndef DISABLE_OCSP case '4': addr->ocsp = *ptr ? *ptr - '0' : OCSP_NOT_REQ; break; # endif } while (*ptr++); break; #endif /*DISABLE_TLS*/ case 'C': /* client authenticator information */ switch (*subid) { case '1': addr->authenticator = *ptr ? string_copy(ptr) : NULL; break; case '2': addr->auth_id = *ptr ? string_copy(ptr) : NULL; break; case '3': addr->auth_sndr = *ptr ? string_copy(ptr) : NULL; break; } while (*ptr++); break; #ifndef DISABLE_PRDR case 'P': setflag(addr, af_prdr_used); break; #endif case 'L': switch (*subid) { #ifdef SUPPORT_PIPE_CONNECT case 2: setflag(addr, af_early_pipe); /*FALLTHROUGH*/ #endif case 1: setflag(addr, af_pipelining); break; } break; case 'K': setflag(addr, af_chunking_used); break; case 'T': setflag(addr, af_tcp_fastopen_conn); if (*subid > '0') setflag(addr, af_tcp_fastopen); if (*subid > '1') setflag(addr, af_tcp_fastopen_data); break; case 'D': if (!addr) goto ADDR_MISMATCH; memcpy(&(addr->dsn_aware), ptr, sizeof(addr->dsn_aware)); ptr += sizeof(addr->dsn_aware); DEBUG(D_deliver) debug_printf("DSN read: addr->dsn_aware = %d\n", addr->dsn_aware); break; case 'A': if (!addr) { ADDR_MISMATCH: msg = string_sprintf("address count mismatch for data read from pipe " "for transport process %d for transport %s", pid, addrlist->transport->driver_name); done = TRUE; break; } switch (*subid) { #ifdef SUPPORT_SOCKS case '2': /* proxy information; must arrive before A0 and applies to that addr XXX oops*/ proxy_session = TRUE; /*XXX should this be cleared somewhere? */ if (*ptr == 0) ptr++; else { proxy_local_address = string_copy(ptr); while(*ptr++); memcpy(&proxy_local_port, ptr, sizeof(proxy_local_port)); ptr += sizeof(proxy_local_port); } break; #endif #ifdef EXPERIMENTAL_DSN_INFO case '1': /* must arrive before A0, and applies to that addr */ /* Two strings: smtp_greeting and helo_response */ addr->smtp_greeting = string_copy(ptr); while(*ptr++); addr->helo_response = string_copy(ptr); while(*ptr++); break; #endif case '0': DEBUG(D_deliver) debug_printf("A0 %s tret %d\n", addr->address, *ptr); addr->transport_return = *ptr++; addr->special_action = *ptr++; memcpy(&addr->basic_errno, ptr, sizeof(addr->basic_errno)); ptr += sizeof(addr->basic_errno); memcpy(&addr->more_errno, ptr, sizeof(addr->more_errno)); ptr += sizeof(addr->more_errno); memcpy(&addr->delivery_usec, ptr, sizeof(addr->delivery_usec)); ptr += sizeof(addr->delivery_usec); memcpy(&addr->flags, ptr, sizeof(addr->flags)); ptr += sizeof(addr->flags); addr->message = *ptr ? string_copy(ptr) : NULL; while(*ptr++); addr->user_message = *ptr ? string_copy(ptr) : NULL; while(*ptr++); /* Always two strings for host information, followed by the port number and DNSSEC mark */ if (*ptr) { h = store_get(sizeof(host_item), FALSE); h->name = string_copy(ptr); while (*ptr++); h->address = string_copy(ptr); while(*ptr++); memcpy(&h->port, ptr, sizeof(h->port)); ptr += sizeof(h->port); h->dnssec = *ptr == '2' ? DS_YES : *ptr == '1' ? DS_NO : DS_UNK; ptr++; addr->host_used = h; } else ptr++; /* Finished with this address */ addr = addr->next; break; } break; /* Local interface address/port */ case 'I': if (*ptr) sending_ip_address = string_copy(ptr); while (*ptr++) ; if (*ptr) sending_port = atoi(CS ptr); while (*ptr++) ; break; /* Z marks the logical end of the data. It is followed by '0' if continue_transport was NULL at the end of transporting, otherwise '1'. We need to know when it becomes NULL during a delivery down a passed SMTP channel so that we don't try to pass anything more down it. Of course, for most normal messages it will remain NULL all the time. */ case 'Z': if (*ptr == '0') { continue_transport = NULL; continue_hostname = NULL; } done = TRUE; DEBUG(D_deliver) debug_printf("Z0%c item read\n", *ptr); break; /* Anything else is a disaster. */ default: msg = string_sprintf("malformed data (%d) read from pipe for transport " "process %d for transport %s", ptr[-1], pid, addr->transport->driver_name); done = TRUE; break; } } /* The done flag is inspected externally, to determine whether or not to call the function again when the process finishes. */ p->done = done; /* If the process hadn't finished, and we haven't seen the end of the data or if we suffered a disaster, update the rest of the state, and return FALSE to indicate "not finished". */ if (!eop && !done) { p->addr = addr; p->msg = msg; return FALSE; } /* Close our end of the pipe, to prevent deadlock if the far end is still pushing stuff into it. */ (void)close(fd); p->fd = -1; /* If we have finished without error, but haven't had data for every address, something is wrong. */ if (!msg && addr) msg = string_sprintf("insufficient address data read from pipe " "for transport process %d for transport %s", pid, addr->transport->driver_name); /* If an error message is set, something has gone wrong in getting back the delivery data. Put the message into each address and freeze it. */ if (msg) for (addr = addrlist; addr; addr = addr->next) { addr->transport_return = DEFER; addr->special_action = SPECIAL_FREEZE; addr->message = msg; log_write(0, LOG_MAIN|LOG_PANIC, "Delivery status for %s: %s\n", addr->address, addr->message); } /* Return TRUE to indicate we have got all we need from this process, even if it hasn't actually finished yet. */ return TRUE; } /************************************************* * Post-process a set of remote addresses * *************************************************/ /* Do what has to be done immediately after a remote delivery for each set of addresses, then re-write the spool if necessary. Note that post_process_one puts the address on an appropriate queue; hence we must fish off the next one first. This function is also called if there is a problem with setting up a subprocess to do a remote delivery in parallel. In this case, the final argument contains a message, and the action must be forced to DEFER. Argument: addr pointer to chain of address items logflags flags for logging msg NULL for normal cases; -> error message for unexpected problems fallback TRUE if processing fallback hosts Returns: nothing */ static void remote_post_process(address_item *addr, int logflags, uschar *msg, BOOL fallback) { /* If any host addresses were found to be unusable, add them to the unusable tree so that subsequent deliveries don't try them. */ for (host_item * h = addr->host_list; h; h = h->next) if (h->address) if (h->status >= hstatus_unusable) tree_add_unusable(h); /* Now handle each address on the chain. The transport has placed '=' or '-' into the special_action field for each successful delivery. */ while (addr) { address_item *next = addr->next; /* If msg == NULL (normal processing) and the result is DEFER and we are processing the main hosts and there are fallback hosts available, put the address on the list for fallback delivery. */ if ( addr->transport_return == DEFER && addr->fallback_hosts && !fallback && !msg ) { addr->host_list = addr->fallback_hosts; addr->next = addr_fallback; addr_fallback = addr; DEBUG(D_deliver) debug_printf("%s queued for fallback host(s)\n", addr->address); } /* If msg is set (=> unexpected problem), set it in the address before doing the ordinary post processing. */ else { if (msg) { addr->message = msg; addr->transport_return = DEFER; } (void)post_process_one(addr, addr->transport_return, logflags, EXIM_DTYPE_TRANSPORT, addr->special_action); } /* Next address */ addr = next; } /* If we have just delivered down a passed SMTP channel, and that was the last address, the channel will have been closed down. Now that we have logged that delivery, set continue_sequence to 1 so that any subsequent deliveries don't get "*" incorrectly logged. */ if (!continue_transport) continue_sequence = 1; } /************************************************* * Wait for one remote delivery subprocess * *************************************************/ /* This function is called while doing remote deliveries when either the maximum number of processes exist and we need one to complete so that another can be created, or when waiting for the last ones to complete. It must wait for the completion of one subprocess, empty the control block slot, and return a pointer to the address chain. Arguments: none Returns: pointer to the chain of addresses handled by the process; NULL if no subprocess found - this is an unexpected error */ static address_item * par_wait(void) { int poffset, status; address_item *addr, *addrlist; pid_t pid; set_process_info("delivering %s: waiting for a remote delivery subprocess " "to finish", message_id); /* Loop until either a subprocess completes, or there are no subprocesses in existence - in which case give an error return. We cannot proceed just by waiting for a completion, because a subprocess may have filled up its pipe, and be waiting for it to be emptied. Therefore, if no processes have finished, we wait for one of the pipes to acquire some data by calling select(), with a timeout just in case. The simple approach is just to iterate after reading data from a ready pipe. This leads to non-ideal behaviour when the subprocess has written its final Z item, closed the pipe, and is in the process of exiting (the common case). A call to waitpid() yields nothing completed, but select() shows the pipe ready - reading it yields EOF, so you end up with busy-waiting until the subprocess has actually finished. To avoid this, if all the data that is needed has been read from a subprocess after select(), an explicit wait() for it is done. We know that all it is doing is writing to the pipe and then exiting, so the wait should not be long. The non-blocking waitpid() is to some extent just insurance; if we could reliably detect end-of-file on the pipe, we could always know when to do a blocking wait() for a completed process. However, because some systems use NDELAY, which doesn't distinguish between EOF and pipe empty, it is easier to use code that functions without the need to recognize EOF. There's a double loop here just in case we end up with a process that is not in the list of remote delivery processes. Something has obviously gone wrong if this is the case. (For example, a process that is incorrectly left over from routing or local deliveries might be found.) The damage can be minimized by looping back and looking for another process. If there aren't any, the error return will happen. */ for (;;) /* Normally we do not repeat this loop */ { while ((pid = waitpid(-1, &status, WNOHANG)) <= 0) { struct timeval tv; fd_set select_pipes; int maxpipe, readycount; /* A return value of -1 can mean several things. If errno != ECHILD, it either means invalid options (which we discount), or that this process was interrupted by a signal. Just loop to try the waitpid() again. If errno == ECHILD, waitpid() is telling us that there are no subprocesses in existence. This should never happen, and is an unexpected error. However, there is a nasty complication when running under Linux. If "strace -f" is being used under Linux to trace this process and its children, subprocesses are "stolen" from their parents and become the children of the tracing process. A general wait such as the one we've just obeyed returns as if there are no children while subprocesses are running. Once a subprocess completes, it is restored to the parent, and waitpid(-1) finds it. Thanks to Joachim Wieland for finding all this out and suggesting a palliative. This does not happen using "truss" on Solaris, nor (I think) with other tracing facilities on other OS. It seems to be specific to Linux. What we do to get round this is to use kill() to see if any of our subprocesses are still in existence. If kill() gives an OK return, we know it must be for one of our processes - it can't be for a re-use of the pid, because if our process had finished, waitpid() would have found it. If any of our subprocesses are in existence, we proceed to use select() as if waitpid() had returned zero. I think this is safe. */ if (pid < 0) { if (errno != ECHILD) continue; /* Repeats the waitpid() */ DEBUG(D_deliver) debug_printf("waitpid() returned -1/ECHILD: checking explicitly " "for process existence\n"); for (poffset = 0; poffset < remote_max_parallel; poffset++) { if ((pid = parlist[poffset].pid) != 0 && kill(pid, 0) == 0) { DEBUG(D_deliver) debug_printf("process %d still exists: assume " "stolen by strace\n", (int)pid); break; /* With poffset set */ } } if (poffset >= remote_max_parallel) { DEBUG(D_deliver) debug_printf("*** no delivery children found\n"); return NULL; /* This is the error return */ } } /* A pid value greater than 0 breaks the "while" loop. A negative value has been handled above. A return value of zero means that there is at least one subprocess, but there are no completed subprocesses. See if any pipes are ready with any data for reading. */ DEBUG(D_deliver) debug_printf("selecting on subprocess pipes\n"); maxpipe = 0; FD_ZERO(&select_pipes); for (poffset = 0; poffset < remote_max_parallel; poffset++) if (parlist[poffset].pid != 0) { int fd = parlist[poffset].fd; FD_SET(fd, &select_pipes); if (fd > maxpipe) maxpipe = fd; } /* Stick in a 60-second timeout, just in case. */ tv.tv_sec = 60; tv.tv_usec = 0; readycount = select(maxpipe + 1, (SELECT_ARG2_TYPE *)&select_pipes, NULL, NULL, &tv); /* Scan through the pipes and read any that are ready; use the count returned by select() to stop when there are no more. Select() can return with no processes (e.g. if interrupted). This shouldn't matter. If par_read_pipe() returns TRUE, it means that either the terminating Z was read, or there was a disaster. In either case, we are finished with this process. Do an explicit wait() for the process and break the main loop if it succeeds. It turns out that we have to deal with the case of an interrupted system call, which can happen on some operating systems if the signal handling is set up to do that by default. */ for (poffset = 0; readycount > 0 && poffset < remote_max_parallel; poffset++) { if ( (pid = parlist[poffset].pid) != 0 && FD_ISSET(parlist[poffset].fd, &select_pipes) ) { readycount--; if (par_read_pipe(poffset, FALSE)) /* Finished with this pipe */ for (;;) /* Loop for signals */ { pid_t endedpid = waitpid(pid, &status, 0); if (endedpid == pid) goto PROCESS_DONE; if (endedpid != (pid_t)(-1) || errno != EINTR) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Unexpected error return " "%d (errno = %d) from waitpid() for process %d", (int)endedpid, errno, (int)pid); } } } /* Now go back and look for a completed subprocess again. */ } /* A completed process was detected by the non-blocking waitpid(). Find the data block that corresponds to this subprocess. */ for (poffset = 0; poffset < remote_max_parallel; poffset++) if (pid == parlist[poffset].pid) break; /* Found the data block; this is a known remote delivery process. We don't need to repeat the outer loop. This should be what normally happens. */ if (poffset < remote_max_parallel) break; /* This situation is an error, but it's probably better to carry on looking for another process than to give up (as we used to do). */ log_write(0, LOG_MAIN|LOG_PANIC, "Process %d finished: not found in remote " "transport process list", pid); } /* End of the "for" loop */ /* Come here when all the data was completely read after a select(), and the process in pid has been wait()ed for. */ PROCESS_DONE: DEBUG(D_deliver) { if (status == 0) debug_printf("remote delivery process %d ended\n", (int)pid); else debug_printf("remote delivery process %d ended: status=%04x\n", (int)pid, status); } set_process_info("delivering %s", message_id); /* Get the chain of processed addresses */ addrlist = parlist[poffset].addrlist; /* If the process did not finish cleanly, record an error and freeze (except for SIGTERM, SIGKILL and SIGQUIT), and also ensure the journal is not removed, in case the delivery did actually happen. */ if ((status & 0xffff) != 0) { uschar *msg; int msb = (status >> 8) & 255; int lsb = status & 255; int code = (msb == 0)? (lsb & 0x7f) : msb; msg = string_sprintf("%s transport process returned non-zero status 0x%04x: " "%s %d", addrlist->transport->driver_name, status, (msb == 0)? "terminated by signal" : "exit code", code); if (msb != 0 || (code != SIGTERM && code != SIGKILL && code != SIGQUIT)) addrlist->special_action = SPECIAL_FREEZE; for (addr = addrlist; addr; addr = addr->next) { addr->transport_return = DEFER; addr->message = msg; } remove_journal = FALSE; } /* Else complete reading the pipe to get the result of the delivery, if all the data has not yet been obtained. */ else if (!parlist[poffset].done) (void)par_read_pipe(poffset, TRUE); /* Put the data count and return path into globals, mark the data slot unused, decrement the count of subprocesses, and return the address chain. */ transport_count = parlist[poffset].transport_count; used_return_path = parlist[poffset].return_path; parlist[poffset].pid = 0; parcount--; return addrlist; } /************************************************* * Wait for subprocesses and post-process * *************************************************/ /* This function waits for subprocesses until the number that are still running is below a given threshold. For each complete subprocess, the addresses are post-processed. If we can't find a running process, there is some shambles. Better not bomb out, as that might lead to multiple copies of the message. Just log and proceed as if all done. Arguments: max maximum number of subprocesses to leave running fallback TRUE if processing fallback hosts Returns: nothing */ static void par_reduce(int max, BOOL fallback) { while (parcount > max) { address_item *doneaddr = par_wait(); if (!doneaddr) { log_write(0, LOG_MAIN|LOG_PANIC, "remote delivery process count got out of step"); parcount = 0; } else { transport_instance * tp = doneaddr->transport; if (tp->max_parallel) enq_end(string_sprintf("tpt-serialize-%s", tp->name)); remote_post_process(doneaddr, LOG_MAIN, NULL, fallback); } } } static void rmt_dlv_checked_write(int fd, char id, char subid, void * buf, ssize_t size) { uschar pipe_header[PIPE_HEADER_SIZE+1]; size_t total_len = PIPE_HEADER_SIZE + size; struct iovec iov[2] = { { pipe_header, PIPE_HEADER_SIZE }, /* indication about the data to expect */ { buf, size } /* *the* data */ }; ssize_t ret; /* we assume that size can't get larger then BIG_BUFFER_SIZE which currently is set to 16k */ /* complain to log if someone tries with buffer sizes we can't handle*/ if (size > BIG_BUFFER_SIZE-1) { log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed writing transport result to pipe: can't handle buffers > %d bytes. truncating!\n", BIG_BUFFER_SIZE-1); size = BIG_BUFFER_SIZE; } /* Should we check that we do not write more than PIPE_BUF? What would that help? */ /* convert size to human readable string prepended by id and subid */ if (PIPE_HEADER_SIZE != snprintf(CS pipe_header, PIPE_HEADER_SIZE+1, "%c%c%05ld", id, subid, (long)size)) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "header snprintf failed\n"); DEBUG(D_deliver) debug_printf("header write id:%c,subid:%c,size:%ld,final:%s\n", id, subid, (long)size, pipe_header); if ((ret = writev(fd, iov, 2)) != total_len) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed writing transport result to pipe (%ld of %ld bytes): %s", (long)ret, (long)total_len, ret == -1 ? strerror(errno) : "short write"); } /************************************************* * Do remote deliveries * *************************************************/ /* This function is called to process the addresses in addr_remote. We must pick off the queue all addresses that have the same transport, remote destination, and errors address, and hand them to the transport in one go, subject to some configured limitations. If this is a run to continue delivering to an existing delivery channel, skip all but those addresses that can go to that channel. The skipped addresses just get deferred. If mua_wrapper is set, all addresses must be able to be sent in a single transaction. If not, this function yields FALSE. In Exim 4, remote deliveries are always done in separate processes, even if remote_max_parallel = 1 or if there's only one delivery to do. The reason is so that the base process can retain privilege. This makes the implementation of fallback transports feasible (though not initially done.) We create up to the configured number of subprocesses, each of which passes back the delivery state via a pipe. (However, when sending down an existing connection, remote_max_parallel is forced to 1.) Arguments: fallback TRUE if processing fallback hosts Returns: TRUE normally FALSE if mua_wrapper is set and the addresses cannot all be sent in one transaction */ static BOOL do_remote_deliveries(BOOL fallback) { int parmax; int poffset; parcount = 0; /* Number of executing subprocesses */ /* When sending down an existing channel, only do one delivery at a time. We use a local variable (parmax) to hold the maximum number of processes; this gets reduced from remote_max_parallel if we can't create enough pipes. */ if (continue_transport) remote_max_parallel = 1; parmax = remote_max_parallel; /* If the data for keeping a list of processes hasn't yet been set up, do so. */ if (!parlist) { parlist = store_get(remote_max_parallel * sizeof(pardata), FALSE); for (poffset = 0; poffset < remote_max_parallel; poffset++) parlist[poffset].pid = 0; } /* Now loop for each remote delivery */ for (int delivery_count = 0; addr_remote; delivery_count++) { pid_t pid; uid_t uid; gid_t gid; int pfd[2]; int address_count = 1; int address_count_max; BOOL multi_domain; BOOL use_initgroups; BOOL pipe_done = FALSE; transport_instance *tp; address_item **anchor = &addr_remote; address_item *addr = addr_remote; address_item *last = addr; address_item *next; uschar * panicmsg; uschar * serialize_key = NULL; /* Pull the first address right off the list. */ addr_remote = addr->next; addr->next = NULL; DEBUG(D_deliver|D_transport) debug_printf("--------> %s <--------\n", addr->address); /* If no transport has been set, there has been a big screw-up somewhere. */ if (!(tp = addr->transport)) { f.disable_logging = FALSE; /* Jic */ panicmsg = US"No transport set by router"; goto panic_continue; } /* Check that this base address hasn't previously been delivered to this transport. The check is necessary at this point to handle homonymic addresses correctly in cases where the pattern of redirection changes between delivery attempts. Non-homonymic previous delivery is detected earlier, at routing time. */ if (previously_transported(addr, FALSE)) continue; /* Force failure if the message is too big. */ if (tp->message_size_limit) { int rc = check_message_size(tp, addr); if (rc != OK) { addr->transport_return = rc; remote_post_process(addr, LOG_MAIN, NULL, fallback); continue; } } /* Get the flag which specifies whether the transport can handle different domains that nevertheless resolve to the same set of hosts. If it needs expanding, get variables set: $address_data, $domain_data, $localpart_data, $host, $host_address, $host_port. */ if (tp->expand_multi_domain) deliver_set_expansions(addr); if (exp_bool(addr, US"transport", tp->name, D_transport, US"multi_domain", tp->multi_domain, tp->expand_multi_domain, &multi_domain) != OK) { deliver_set_expansions(NULL); panicmsg = addr->message; goto panic_continue; } /* Get the maximum it can handle in one envelope, with zero meaning unlimited, which is forced for the MUA wrapper case. */ address_count_max = tp->max_addresses; if (address_count_max == 0 || mua_wrapper) address_count_max = 999999; /************************************************************************/ /***** This is slightly experimental code, but should be safe. *****/ /* The address_count_max value is the maximum number of addresses that the transport can send in one envelope. However, the transport must be capable of dealing with any number of addresses. If the number it gets exceeds its envelope limitation, it must send multiple copies of the message. This can be done over a single connection for SMTP, so uses less resources than making multiple connections. On the other hand, if remote_max_parallel is greater than one, it is perhaps a good idea to use parallel processing to move the message faster, even if that results in multiple simultaneous connections to the same host. How can we come to some compromise between these two ideals? What we do is to limit the number of addresses passed to a single instance of a transport to the greater of (a) its address limit (rcpt_max for SMTP) and (b) the total number of addresses routed to remote transports divided by remote_max_parallel. For example, if the message has 100 remote recipients, remote max parallel is 2, and rcpt_max is 10, we'd never send more than 50 at once. But if rcpt_max is 100, we could send up to 100. Of course, not all the remotely addresses in a message are going to go to the same set of hosts (except in smarthost configurations), so this is just a heuristic way of dividing up the work. Furthermore (1), because this may not be wanted in some cases, and also to cope with really pathological cases, there is also a limit to the number of messages that are sent over one connection. This is the same limit that is used when sending several different messages over the same connection. Continue_sequence is set when in this situation, to the number sent so far, including this message. Furthermore (2), when somebody explicitly sets the maximum value to 1, it is probably because they are using VERP, in which case they want to pass only one address at a time to the transport, in order to be able to use $local_part and $domain in constructing a new return path. We could test for the use of these variables, but as it is so likely they will be used when the maximum is 1, we don't bother. Just leave the value alone. */ if ( address_count_max != 1 && address_count_max < remote_delivery_count/remote_max_parallel ) { int new_max = remote_delivery_count/remote_max_parallel; int message_max = tp->connection_max_messages; if (connection_max_messages >= 0) message_max = connection_max_messages; message_max -= continue_sequence - 1; if (message_max > 0 && new_max > address_count_max * message_max) new_max = address_count_max * message_max; address_count_max = new_max; } /************************************************************************/ /* Pick off all addresses which have the same transport, errors address, destination, and extra headers. In some cases they point to the same host list, but we also need to check for identical host lists generated from entirely different domains. The host list pointers can be NULL in the case where the hosts are defined in the transport. There is also a configured maximum limit of addresses that can be handled at once (see comments above for how it is computed). If the transport does not handle multiple domains, enforce that also, and if it might need a per-address check for this, re-evaluate it. */ while ((next = *anchor) && address_count < address_count_max) { BOOL md; if ( (multi_domain || Ustrcmp(next->domain, addr->domain) == 0) && tp == next->transport && same_hosts(next->host_list, addr->host_list) && same_strings(next->prop.errors_address, addr->prop.errors_address) && same_headers(next->prop.extra_headers, addr->prop.extra_headers) && same_ugid(tp, next, addr) && ( next->prop.remove_headers == addr->prop.remove_headers || ( next->prop.remove_headers && addr->prop.remove_headers && Ustrcmp(next->prop.remove_headers, addr->prop.remove_headers) == 0 ) ) && ( !multi_domain || ( ( (void)(!tp->expand_multi_domain || ((void)deliver_set_expansions(next), 1)), exp_bool(addr, US"transport", next->transport->name, D_transport, US"multi_domain", next->transport->multi_domain, next->transport->expand_multi_domain, &md) == OK ) && md ) ) ) { *anchor = next->next; next->next = NULL; next->first = addr; /* remember top one (for retry processing) */ last->next = next; last = next; address_count++; } else anchor = &(next->next); deliver_set_expansions(NULL); } /* If we are acting as an MUA wrapper, all addresses must go in a single transaction. If not, put them back on the chain and yield FALSE. */ if (mua_wrapper && addr_remote) { last->next = addr_remote; addr_remote = addr; return FALSE; } /* If the transport is limited for parallellism, enforce that here. The hints DB entry is decremented in par_reduce(), when we reap the transport process. */ if (tpt_parallel_check(tp, addr, &serialize_key)) if ((panicmsg = expand_string_message)) goto panic_continue; else continue; /* Loop for the next set of addresses. */ /* Set up the expansion variables for this set of addresses */ deliver_set_expansions(addr); /* Ensure any transport-set auth info is fresh */ addr->authenticator = addr->auth_id = addr->auth_sndr = NULL; /* Compute the return path, expanding a new one if required. The old one must be set first, as it might be referred to in the expansion. */ if(addr->prop.errors_address) return_path = addr->prop.errors_address; #ifdef EXPERIMENTAL_SRS else if(addr->prop.srs_sender) return_path = addr->prop.srs_sender; #endif else return_path = sender_address; if (tp->return_path) { uschar *new_return_path = expand_string(tp->return_path); if (new_return_path) return_path = new_return_path; else if (!f.expand_string_forcedfail) { panicmsg = string_sprintf("Failed to expand return path \"%s\": %s", tp->return_path, expand_string_message); goto enq_continue; } } /* Find the uid, gid, and use_initgroups setting for this transport. Failure logs and sets up error messages, so we just post-process and continue with the next address. */ if (!findugid(addr, tp, &uid, &gid, &use_initgroups)) { panicmsg = NULL; goto enq_continue; } /* If this transport has a setup function, call it now so that it gets run in this process and not in any subprocess. That way, the results of any setup that are retained by the transport can be reusable. One of the things the setup does is to set the fallback host lists in the addresses. That is why it is called at this point, before the continue delivery processing, because that might use the fallback hosts. */ if (tp->setup) (void)((tp->setup)(addr->transport, addr, NULL, uid, gid, NULL)); /* If we have a connection still open from a verify stage (lazy-close) treat it as if it is a continued connection (apart from the counter used for the log line mark). */ if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only) { DEBUG(D_deliver) debug_printf("lazy-callout-close: have conn still open from verification\n"); continue_transport = cutthrough.transport; continue_hostname = string_copy(cutthrough.host.name); continue_host_address = string_copy(cutthrough.host.address); continue_sequence = 1; sending_ip_address = cutthrough.snd_ip; sending_port = cutthrough.snd_port; smtp_peer_options = cutthrough.peer_options; } /* If this is a run to continue delivery down an already-established channel, check that this set of addresses matches the transport and the channel. If it does not, defer the addresses. If a host list exists, we must check that the continue host is on the list. Otherwise, the host is set in the transport. */ f.continue_more = FALSE; /* In case got set for the last lot */ if (continue_transport) { BOOL ok = Ustrcmp(continue_transport, tp->name) == 0; /* If the transport is about to override the host list do not check it here but take the cost of running the transport process to discover if the continued_hostname connection is suitable. This is a layering violation which is unfortunate as it requires we haul in the smtp include file. */ if (ok) { smtp_transport_options_block * ob; if ( !( Ustrcmp(tp->info->driver_name, "smtp") == 0 && (ob = (smtp_transport_options_block *)tp->options_block) && ob->hosts_override && ob->hosts ) && addr->host_list ) { ok = FALSE; for (host_item * h = addr->host_list; h; h = h->next) if (Ustrcmp(h->name, continue_hostname) == 0) /*XXX should also check port here */ { ok = TRUE; break; } } } /* Addresses not suitable; defer or queue for fallback hosts (which might be the continue host) and skip to next address. */ if (!ok) { DEBUG(D_deliver) debug_printf("not suitable for continue_transport (%s)\n", Ustrcmp(continue_transport, tp->name) != 0 ? string_sprintf("tpt %s vs %s", continue_transport, tp->name) : string_sprintf("no host matching %s", continue_hostname)); if (serialize_key) enq_end(serialize_key); if (addr->fallback_hosts && !fallback) { for (next = addr; ; next = next->next) { next->host_list = next->fallback_hosts; DEBUG(D_deliver) debug_printf("%s queued for fallback host(s)\n", next->address); if (!next->next) break; } next->next = addr_fallback; addr_fallback = addr; } else { for (next = addr; ; next = next->next) { DEBUG(D_deliver) debug_printf(" %s to def list\n", next->address); if (!next->next) break; } next->next = addr_defer; addr_defer = addr; } continue; } /* Set a flag indicating whether there are further addresses that list the continued host. This tells the transport to leave the channel open, but not to pass it to another delivery process. We'd like to do that for non-continue_transport cases too but the knowlege of which host is connected to is too hard to manage. Perhaps we need a finer-grain interface to the transport. */ for (next = addr_remote; next && !f.continue_more; next = next->next) for (host_item * h = next->host_list; h; h = h->next) if (Ustrcmp(h->name, continue_hostname) == 0) { f.continue_more = TRUE; break; } } /* The transports set up the process info themselves as they may connect to more than one remote machine. They also have to set up the filter arguments, if required, so that the host name and address are available for expansion. */ transport_filter_argv = NULL; /* Create the pipe for inter-process communication. If pipe creation fails, it is probably because the value of remote_max_parallel is so large that too many file descriptors for pipes have been created. Arrange to wait for a process to finish, and then try again. If we still can't create a pipe when all processes have finished, break the retry loop. */ while (!pipe_done) { if (pipe(pfd) == 0) pipe_done = TRUE; else if (parcount > 0) parmax = parcount; else break; /* We need to make the reading end of the pipe non-blocking. There are two different options for this. Exim is cunningly (I hope!) coded so that it can use either of them, though it prefers O_NONBLOCK, which distinguishes between EOF and no-more-data. */ /* The data appears in a timely manner and we already did a select on all pipes, so I do not see a reason to use non-blocking IO here #ifdef O_NONBLOCK (void)fcntl(pfd[pipe_read], F_SETFL, O_NONBLOCK); #else (void)fcntl(pfd[pipe_read], F_SETFL, O_NDELAY); #endif */ /* If the maximum number of subprocesses already exist, wait for a process to finish. If we ran out of file descriptors, parmax will have been reduced from its initial value of remote_max_parallel. */ par_reduce(parmax - 1, fallback); } /* If we failed to create a pipe and there were no processes to wait for, we have to give up on this one. Do this outside the above loop so that we can continue the main loop. */ if (!pipe_done) { panicmsg = string_sprintf("unable to create pipe: %s", strerror(errno)); goto enq_continue; } /* Find a free slot in the pardata list. Must do this after the possible waiting for processes to finish, because a terminating process will free up a slot. */ for (poffset = 0; poffset < remote_max_parallel; poffset++) if (parlist[poffset].pid == 0) break; /* If there isn't one, there has been a horrible disaster. */ if (poffset >= remote_max_parallel) { (void)close(pfd[pipe_write]); (void)close(pfd[pipe_read]); panicmsg = US"Unexpectedly no free subprocess slot"; goto enq_continue; } /* Now fork a subprocess to do the remote delivery, but before doing so, ensure that any cached resources are released so as not to interfere with what happens in the subprocess. */ search_tidyup(); if ((pid = fork()) == 0) { int fd = pfd[pipe_write]; host_item *h; /* Setting this global in the subprocess means we need never clear it */ transport_name = tp->name; /* There are weird circumstances in which logging is disabled */ f.disable_logging = tp->disable_logging; /* Show pids on debug output if parallelism possible */ if (parmax > 1 && (parcount > 0 || addr_remote)) { DEBUG(D_any|D_v) debug_selector |= D_pid; DEBUG(D_deliver) debug_printf("Remote delivery process started\n"); } /* Reset the random number generator, so different processes don't all have the same sequence. In the test harness we want different, but predictable settings for each delivery process, so do something explicit here rather they rely on the fixed reset in the random number function. */ random_seed = f.running_in_test_harness ? 42 + 2*delivery_count : 0; /* Set close-on-exec on the pipe so that it doesn't get passed on to a new process that may be forked to do another delivery down the same SMTP connection. */ (void)fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC); /* Close open file descriptors for the pipes of other processes that are running in parallel. */ for (poffset = 0; poffset < remote_max_parallel; poffset++) if (parlist[poffset].pid != 0) (void)close(parlist[poffset].fd); /* This process has inherited a copy of the file descriptor for the data file, but its file pointer is shared with all the other processes running in parallel. Therefore, we have to re-open the file in order to get a new file descriptor with its own file pointer. We don't need to lock it, as the lock is held by the parent process. There doesn't seem to be any way of doing a dup-with-new-file-pointer. */ (void)close(deliver_datafile); { uschar * fname = spool_fname(US"input", message_subdir, message_id, US"-D"); if ((deliver_datafile = Uopen(fname, #ifdef O_CLOEXEC O_CLOEXEC | #endif O_RDWR | O_APPEND, 0)) < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to reopen %s for remote " "parallel delivery: %s", fname, strerror(errno)); } /* Set the close-on-exec flag */ #ifndef O_CLOEXEC (void)fcntl(deliver_datafile, F_SETFD, fcntl(deliver_datafile, F_GETFD) | FD_CLOEXEC); #endif /* Set the uid/gid of this process; bombs out on failure. */ exim_setugid(uid, gid, use_initgroups, string_sprintf("remote delivery to %s with transport=%s", addr->address, tp->name)); /* Close the unwanted half of this process' pipe, set the process state, and run the transport. Afterwards, transport_count will contain the number of bytes written. */ (void)close(pfd[pipe_read]); set_process_info("delivering %s using %s", message_id, tp->name); debug_print_string(tp->debug_string); if (!(tp->info->code)(addr->transport, addr)) replicate_status(addr); set_process_info("delivering %s (just run %s for %s%s in subprocess)", message_id, tp->name, addr->address, addr->next ? ", ..." : ""); /* Ensure any cached resources that we used are now released */ search_tidyup(); /* Pass the result back down the pipe. This is a lot more information than is needed for a local delivery. We have to send back the error status for each address, the usability status for each host that is flagged as unusable, and all the retry items. When TLS is in use, we send also the cipher and peerdn information. Each type of information is flagged by an identifying byte, and is then in a fixed format (with strings terminated by zeros), and there is a final terminator at the end. The host information and retry information is all attached to the first address, so that gets sent at the start. */ /* Host unusability information: for most success cases this will be null. */ for (h = addr->host_list; h; h = h->next) { if (!h->address || h->status < hstatus_unusable) continue; sprintf(CS big_buffer, "%c%c%s", h->status, h->why, h->address); rmt_dlv_checked_write(fd, 'H', '0', big_buffer, Ustrlen(big_buffer+2) + 3); } /* The number of bytes written. This is the same for each address. Even if we sent several copies of the message down the same connection, the size of each one is the same, and it's that value we have got because transport_count gets reset before calling transport_write_message(). */ memcpy(big_buffer, &transport_count, sizeof(transport_count)); rmt_dlv_checked_write(fd, 'S', '0', big_buffer, sizeof(transport_count)); /* Information about what happened to each address. Four item types are used: an optional 'X' item first, for TLS information, then an optional "C" item for any client-auth info followed by 'R' items for any retry settings, and finally an 'A' item for the remaining data. */ for(; addr; addr = addr->next) { uschar *ptr; /* The certificate verification status goes into the flags */ if (tls_out.certificate_verified) setflag(addr, af_cert_verified); #ifdef SUPPORT_DANE if (tls_out.dane_verified) setflag(addr, af_dane_verified); #endif # ifdef EXPERIMENTAL_TLS_RESUME if (tls_out.resumption & RESUME_USED) setflag(addr, af_tls_resume); # endif /* Use an X item only if there's something to send */ #ifndef DISABLE_TLS if (addr->cipher) { ptr = big_buffer + sprintf(CS big_buffer, "%.128s", addr->cipher) + 1; if (!addr->peerdn) *ptr++ = 0; else ptr += sprintf(CS ptr, "%.512s", addr->peerdn) + 1; rmt_dlv_checked_write(fd, 'X', '1', big_buffer, ptr - big_buffer); } else if (continue_proxy_cipher) { ptr = big_buffer + sprintf(CS big_buffer, "%.128s", continue_proxy_cipher) + 1; *ptr++ = 0; rmt_dlv_checked_write(fd, 'X', '1', big_buffer, ptr - big_buffer); } if (addr->peercert) { ptr = big_buffer; if (!tls_export_cert(ptr, big_buffer_size-2, addr->peercert)) while(*ptr++); else *ptr++ = 0; rmt_dlv_checked_write(fd, 'X', '2', big_buffer, ptr - big_buffer); } if (addr->ourcert) { ptr = big_buffer; if (!tls_export_cert(ptr, big_buffer_size-2, addr->ourcert)) while(*ptr++); else *ptr++ = 0; rmt_dlv_checked_write(fd, 'X', '3', big_buffer, ptr - big_buffer); } # ifndef DISABLE_OCSP if (addr->ocsp > OCSP_NOT_REQ) { ptr = big_buffer + sprintf(CS big_buffer, "%c", addr->ocsp + '0') + 1; rmt_dlv_checked_write(fd, 'X', '4', big_buffer, ptr - big_buffer); } # endif #endif /*DISABLE_TLS*/ if (client_authenticator) { ptr = big_buffer + sprintf(CS big_buffer, "%.64s", client_authenticator) + 1; rmt_dlv_checked_write(fd, 'C', '1', big_buffer, ptr - big_buffer); } if (client_authenticated_id) { ptr = big_buffer + sprintf(CS big_buffer, "%.64s", client_authenticated_id) + 1; rmt_dlv_checked_write(fd, 'C', '2', big_buffer, ptr - big_buffer); } if (client_authenticated_sender) { ptr = big_buffer + sprintf(CS big_buffer, "%.64s", client_authenticated_sender) + 1; rmt_dlv_checked_write(fd, 'C', '3', big_buffer, ptr - big_buffer); } #ifndef DISABLE_PRDR if (testflag(addr, af_prdr_used)) rmt_dlv_checked_write(fd, 'P', '0', NULL, 0); #endif if (testflag(addr, af_pipelining)) #ifdef SUPPORT_PIPE_CONNECT if (testflag(addr, af_early_pipe)) rmt_dlv_checked_write(fd, 'L', '2', NULL, 0); else #endif rmt_dlv_checked_write(fd, 'L', '1', NULL, 0); if (testflag(addr, af_chunking_used)) rmt_dlv_checked_write(fd, 'K', '0', NULL, 0); if (testflag(addr, af_tcp_fastopen_conn)) rmt_dlv_checked_write(fd, 'T', testflag(addr, af_tcp_fastopen) ? testflag(addr, af_tcp_fastopen_data) ? '2' : '1' : '0', NULL, 0); memcpy(big_buffer, &addr->dsn_aware, sizeof(addr->dsn_aware)); rmt_dlv_checked_write(fd, 'D', '0', big_buffer, sizeof(addr->dsn_aware)); /* Retry information: for most success cases this will be null. */ for (retry_item * r = addr->retries; r; r = r->next) { sprintf(CS big_buffer, "%c%.500s", r->flags, r->key); ptr = big_buffer + Ustrlen(big_buffer+2) + 3; memcpy(ptr, &r->basic_errno, sizeof(r->basic_errno)); ptr += sizeof(r->basic_errno); memcpy(ptr, &r->more_errno, sizeof(r->more_errno)); ptr += sizeof(r->more_errno); if (!r->message) *ptr++ = 0; else { sprintf(CS ptr, "%.512s", r->message); while(*ptr++); } rmt_dlv_checked_write(fd, 'R', '0', big_buffer, ptr - big_buffer); } #ifdef SUPPORT_SOCKS if (LOGGING(proxy) && proxy_session) { ptr = big_buffer; if (proxy_local_address) { DEBUG(D_deliver) debug_printf("proxy_local_address '%s'\n", proxy_local_address); ptr = big_buffer + sprintf(CS ptr, "%.128s", proxy_local_address) + 1; DEBUG(D_deliver) debug_printf("proxy_local_port %d\n", proxy_local_port); memcpy(ptr, &proxy_local_port, sizeof(proxy_local_port)); ptr += sizeof(proxy_local_port); } else *ptr++ = '\0'; rmt_dlv_checked_write(fd, 'A', '2', big_buffer, ptr - big_buffer); } #endif #ifdef EXPERIMENTAL_DSN_INFO /*um, are they really per-addr? Other per-conn stuff is not (auth, tls). But host_used is! */ if (addr->smtp_greeting) { DEBUG(D_deliver) debug_printf("smtp_greeting '%s'\n", addr->smtp_greeting); ptr = big_buffer + sprintf(CS big_buffer, "%.128s", addr->smtp_greeting) + 1; if (addr->helo_response) { DEBUG(D_deliver) debug_printf("helo_response '%s'\n", addr->helo_response); ptr += sprintf(CS ptr, "%.128s", addr->helo_response) + 1; } else *ptr++ = '\0'; rmt_dlv_checked_write(fd, 'A', '1', big_buffer, ptr - big_buffer); } #endif /* The rest of the information goes in an 'A0' item. */ sprintf(CS big_buffer, "%c%c", addr->transport_return, addr->special_action); ptr = big_buffer + 2; memcpy(ptr, &addr->basic_errno, sizeof(addr->basic_errno)); ptr += sizeof(addr->basic_errno); memcpy(ptr, &addr->more_errno, sizeof(addr->more_errno)); ptr += sizeof(addr->more_errno); memcpy(ptr, &addr->delivery_usec, sizeof(addr->delivery_usec)); ptr += sizeof(addr->delivery_usec); memcpy(ptr, &addr->flags, sizeof(addr->flags)); ptr += sizeof(addr->flags); if (!addr->message) *ptr++ = 0; else ptr += sprintf(CS ptr, "%.1024s", addr->message) + 1; if (!addr->user_message) *ptr++ = 0; else ptr += sprintf(CS ptr, "%.1024s", addr->user_message) + 1; if (!addr->host_used) *ptr++ = 0; else { ptr += sprintf(CS ptr, "%.256s", addr->host_used->name) + 1; ptr += sprintf(CS ptr, "%.64s", addr->host_used->address) + 1; memcpy(ptr, &addr->host_used->port, sizeof(addr->host_used->port)); ptr += sizeof(addr->host_used->port); /* DNS lookup status */ *ptr++ = addr->host_used->dnssec==DS_YES ? '2' : addr->host_used->dnssec==DS_NO ? '1' : '0'; } rmt_dlv_checked_write(fd, 'A', '0', big_buffer, ptr - big_buffer); } /* Local interface address/port */ #ifdef EXPERIMENTAL_DSN_INFO if (sending_ip_address) #else if (LOGGING(incoming_interface) && sending_ip_address) #endif { uschar * ptr; ptr = big_buffer + sprintf(CS big_buffer, "%.128s", sending_ip_address) + 1; ptr += sprintf(CS ptr, "%d", sending_port) + 1; rmt_dlv_checked_write(fd, 'I', '0', big_buffer, ptr - big_buffer); } /* Add termination flag, close the pipe, and that's it. The character after 'Z' indicates whether continue_transport is now NULL or not. A change from non-NULL to NULL indicates a problem with a continuing connection. */ big_buffer[0] = continue_transport ? '1' : '0'; rmt_dlv_checked_write(fd, 'Z', '0', big_buffer, 1); (void)close(fd); exit(EXIT_SUCCESS); } /* Back in the mainline: close the unwanted half of the pipe. */ (void)close(pfd[pipe_write]); /* If we have a connection still open from a verify stage (lazy-close) release its TLS library context (if any) as responsibility was passed to the delivery child process. */ if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only) { #ifndef DISABLE_TLS if (cutthrough.is_tls) tls_close(cutthrough.cctx.tls_ctx, TLS_NO_SHUTDOWN); #endif (void) close(cutthrough.cctx.sock); release_cutthrough_connection(US"passed to transport proc"); } /* Fork failed; defer with error message */ if (pid == -1) { (void)close(pfd[pipe_read]); panicmsg = string_sprintf("fork failed for remote delivery to %s: %s", addr->domain, strerror(errno)); goto enq_continue; } /* Fork succeeded; increment the count, and remember relevant data for when the process finishes. */ parcount++; parlist[poffset].addrlist = parlist[poffset].addr = addr; parlist[poffset].pid = pid; parlist[poffset].fd = pfd[pipe_read]; parlist[poffset].done = FALSE; parlist[poffset].msg = NULL; parlist[poffset].return_path = return_path; /* If the process we've just started is sending a message down an existing channel, wait for it now. This ensures that only one such process runs at once, whatever the value of remote_max parallel. Otherwise, we might try to send two or more messages simultaneously down the same channel. This could happen if there are different domains that include the same host in otherwise different host lists. Also, if the transport closes down the channel, this information gets back (continue_transport gets set to NULL) before we consider any other addresses in this message. */ if (continue_transport) par_reduce(0, fallback); /* Otherwise, if we are running in the test harness, wait a bit, to let the newly created process get going before we create another process. This should ensure repeatability in the tests. We only need to wait a tad. */ else if (f.running_in_test_harness) millisleep(500); continue; enq_continue: if (serialize_key) enq_end(serialize_key); panic_continue: remote_post_process(addr, LOG_MAIN|LOG_PANIC, panicmsg, fallback); continue; } /* Reached the end of the list of addresses. Wait for all the subprocesses that are still running and post-process their addresses. */ par_reduce(0, fallback); return TRUE; } /************************************************* * Split an address into local part and domain * *************************************************/ /* This function initializes an address for routing by splitting it up into a local part and a domain. The local part is set up twice - once in its original casing, and once in lower case, and it is dequoted. We also do the "percent hack" for configured domains. This may lead to a DEFER result if a lookup defers. When a percent-hacking takes place, we insert a copy of the original address as a new parent of this address, as if we have had a redirection. Argument: addr points to an addr_item block containing the address Returns: OK DEFER - could not determine if domain is %-hackable */ int deliver_split_address(address_item * addr) { uschar * address = addr->address; uschar * domain; uschar * t; int len; if (!(domain = Ustrrchr(address, '@'))) return DEFER; /* should always have a domain, but just in case... */ len = domain - address; addr->domain = string_copylc(domain+1); /* Domains are always caseless */ /* The implication in the RFCs (though I can't say I've seen it spelled out explicitly) is that quoting should be removed from local parts at the point where they are locally interpreted. [The new draft "821" is more explicit on this, Jan 1999.] We know the syntax is valid, so this can be done by simply removing quoting backslashes and any unquoted doublequotes. */ t = addr->cc_local_part = store_get(len+1, is_tainted(address)); while(len-- > 0) { int c = *address++; if (c == '\"') continue; if (c == '\\') { *t++ = *address++; len--; } else *t++ = c; } *t = 0; /* We do the percent hack only for those domains that are listed in percent_hack_domains. A loop is required, to copy with multiple %-hacks. */ if (percent_hack_domains) { int rc; uschar *new_address = NULL; uschar *local_part = addr->cc_local_part; deliver_domain = addr->domain; /* set $domain */ while ( (rc = match_isinlist(deliver_domain, (const uschar **)&percent_hack_domains, 0, &domainlist_anchor, addr->domain_cache, MCL_DOMAIN, TRUE, NULL)) == OK && (t = Ustrrchr(local_part, '%')) != NULL ) { new_address = string_copy(local_part); new_address[t - local_part] = '@'; deliver_domain = string_copylc(t+1); local_part = string_copyn(local_part, t - local_part); } if (rc == DEFER) return DEFER; /* lookup deferred */ /* If hackery happened, set up new parent and alter the current address. */ if (new_address) { address_item *new_parent = store_get(sizeof(address_item), FALSE); *new_parent = *addr; addr->parent = new_parent; new_parent->child_count = 1; addr->address = new_address; addr->unique = string_copy(new_address); addr->domain = deliver_domain; addr->cc_local_part = local_part; DEBUG(D_deliver) debug_printf("%%-hack changed address to: %s\n", addr->address); } } /* Create the lowercased version of the final local part, and make that the default one to be used. */ addr->local_part = addr->lc_local_part = string_copylc(addr->cc_local_part); return OK; } /************************************************* * Get next error message text * *************************************************/ /* If f is not NULL, read the next "paragraph", from a customized error message text file, terminated by a line containing ****, and expand it. Arguments: f NULL or a file to read from which string indicating which string (for errors) Returns: NULL or an expanded string */ static uschar * next_emf(FILE *f, uschar *which) { uschar *yield; gstring * para; uschar buffer[256]; if (!f) return NULL; if (!Ufgets(buffer, sizeof(buffer), f) || Ustrcmp(buffer, "****\n") == 0) return NULL; para = string_get(256); for (;;) { para = string_cat(para, buffer); if (!Ufgets(buffer, sizeof(buffer), f) || Ustrcmp(buffer, "****\n") == 0) break; } if ((yield = expand_string(string_from_gstring(para)))) return yield; log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand string from " "bounce_message_file or warn_message_file (%s): %s", which, expand_string_message); return NULL; } /************************************************* * Close down a passed transport channel * *************************************************/ /* This function is called when a passed transport channel cannot be used. It attempts to close it down tidily. The yield is always DELIVER_NOT_ATTEMPTED so that the function call can be the argument of a "return" statement. Arguments: None Returns: DELIVER_NOT_ATTEMPTED */ static int continue_closedown(void) { if (continue_transport) for (transport_instance * t = transports; t; t = t->next) if (Ustrcmp(t->name, continue_transport) == 0) { if (t->info->closedown) (t->info->closedown)(t); break; } return DELIVER_NOT_ATTEMPTED; } /************************************************* * Print address information * *************************************************/ /* This function is called to output an address, or information about an address, for bounce or defer messages. If the hide_child flag is set, all we output is the original ancestor address. Arguments: addr points to the address f the FILE to print to si an initial string sc a continuation string for before "generated" se an end string Returns: TRUE if the address is not hidden */ static BOOL print_address_information(address_item *addr, FILE *f, uschar *si, uschar *sc, uschar *se) { BOOL yield = TRUE; uschar *printed = US""; address_item *ancestor = addr; while (ancestor->parent) ancestor = ancestor->parent; fprintf(f, "%s", CS si); if (addr->parent && testflag(addr, af_hide_child)) { printed = US"an undisclosed address"; yield = FALSE; } else if (!testflag(addr, af_pfr) || !addr->parent) printed = addr->address; else { uschar *s = addr->address; uschar *ss; if (addr->address[0] == '>') { ss = US"mail"; s++; } else if (addr->address[0] == '|') ss = US"pipe"; else ss = US"save"; fprintf(f, "%s to %s%sgenerated by ", ss, s, sc); printed = addr->parent->address; } fprintf(f, "%s", CS string_printing(printed)); if (ancestor != addr) { uschar *original = ancestor->onetime_parent; if (!original) original= ancestor->address; if (strcmpic(original, printed) != 0) fprintf(f, "%s(%sgenerated from %s)", sc, ancestor != addr->parent ? "ultimately " : "", string_printing(original)); } if (addr->host_used) fprintf(f, "\n host %s [%s]", addr->host_used->name, addr->host_used->address); fprintf(f, "%s", CS se); return yield; } /************************************************* * Print error for an address * *************************************************/ /* This function is called to print the error information out of an address for a bounce or a warning message. It tries to format the message reasonably by introducing newlines. All lines are indented by 4; the initial printing position must be set before calling. This function used always to print the error. Nowadays we want to restrict it to cases such as LMTP/SMTP errors from a remote host, and errors from :fail: and filter "fail". We no longer pass other information willy-nilly in bounce and warning messages. Text in user_message is always output; text in message only if the af_pass_message flag is set. Arguments: addr the address f the FILE to print on t some leading text Returns: nothing */ static void print_address_error(address_item *addr, FILE *f, uschar *t) { int count = Ustrlen(t); uschar *s = testflag(addr, af_pass_message) ? addr->message : NULL; if (!s && !(s = addr->user_message)) return; fprintf(f, "\n %s", t); while (*s) if (*s == '\\' && s[1] == 'n') { fprintf(f, "\n "); s += 2; count = 0; } else { fputc(*s, f); count++; if (*s++ == ':' && isspace(*s) && count > 45) { fprintf(f, "\n "); /* sic (because space follows) */ count = 0; } } } /*********************************************************** * Print Diagnostic-Code for an address * ************************************************************/ /* This function is called to print the error information out of an address for a bounce or a warning message. It tries to format the message reasonably as required by RFC 3461 by adding a space after each newline it uses the same logic as print_address_error() above. if af_pass_message is true and addr->message is set it uses the remote host answer. if not addr->user_message is used instead if available. Arguments: addr the address f the FILE to print on Returns: nothing */ static void print_dsn_diagnostic_code(const address_item *addr, FILE *f) { uschar *s = testflag(addr, af_pass_message) ? addr->message : NULL; /* af_pass_message and addr->message set ? print remote host answer */ if (s) { DEBUG(D_deliver) debug_printf("DSN Diagnostic-Code: addr->message = %s\n", addr->message); /* search first ": ". we assume to find the remote-MTA answer there */ if (!(s = Ustrstr(addr->message, ": "))) return; /* not found, bail out */ s += 2; /* skip ": " */ fprintf(f, "Diagnostic-Code: smtp; "); } /* no message available. do nothing */ else return; while (*s) if (*s == '\\' && s[1] == 'n') { fputs("\n ", f); /* as defined in RFC 3461 */ s += 2; } else fputc(*s++, f); fputc('\n', f); } /************************************************* * Check list of addresses for duplication * *************************************************/ /* This function was introduced when the test for duplicate addresses that are not pipes, files, or autoreplies was moved from the middle of routing to when routing was complete. That was to fix obscure cases when the routing history affects the subsequent routing of identical addresses. This function is called after routing, to check that the final routed addresses are not duplicates. If we detect a duplicate, we remember what it is a duplicate of. Note that pipe, file, and autoreply de-duplication is handled during routing, so we must leave such "addresses" alone here, as otherwise they will incorrectly be discarded. Argument: address of list anchor Returns: nothing */ static void do_duplicate_check(address_item **anchor) { address_item *addr; while ((addr = *anchor)) { tree_node *tnode; if (testflag(addr, af_pfr)) { anchor = &(addr->next); } else if ((tnode = tree_search(tree_duplicates, addr->unique))) { DEBUG(D_deliver|D_route) debug_printf("%s is a duplicate address: discarded\n", addr->unique); *anchor = addr->next; addr->dupof = tnode->data.ptr; addr->next = addr_duplicate; addr_duplicate = addr; } else { tree_add_duplicate(addr->unique, addr); anchor = &(addr->next); } } } /************************************************/ static void print_dsn_addr_action(FILE * f, address_item * addr, uschar * action, uschar * status) { address_item * pa; if (addr->dsn_orcpt) fprintf(f,"Original-Recipient: %s\n", addr->dsn_orcpt); for (pa = addr; pa->parent; ) pa = pa->parent; fprintf(f, "Action: %s\n" "Final-Recipient: rfc822;%s\n" "Status: %s\n", action, pa->address, status); } /************************************************* * Deliver one message * *************************************************/ /* This is the function which is called when a message is to be delivered. It is passed the id of the message. It is possible that the message no longer exists, if some other process has delivered it, and it is also possible that the message is being worked on by another process, in which case the data file will be locked. If no delivery is attempted for any of the above reasons, the function returns DELIVER_NOT_ATTEMPTED. If the give_up flag is set true, do not attempt any deliveries, but instead fail all outstanding addresses and return the message to the sender (or whoever). A delivery operation has a process all to itself; we never deliver more than one message in the same process. Therefore we needn't worry too much about store leakage. Liable to be called as root. Arguments: id the id of the message to be delivered forced TRUE if delivery was forced by an administrator; this overrides retry delays and causes a delivery to be tried regardless give_up TRUE if an administrator has requested that delivery attempts be abandoned Returns: When the global variable mua_wrapper is FALSE: DELIVER_ATTEMPTED_NORMAL if a delivery attempt was made DELIVER_NOT_ATTEMPTED otherwise (see comment above) When the global variable mua_wrapper is TRUE: DELIVER_MUA_SUCCEEDED if delivery succeeded DELIVER_MUA_FAILED if delivery failed DELIVER_NOT_ATTEMPTED if not attempted (should not occur) */ int deliver_message(uschar *id, BOOL forced, BOOL give_up) { int i, rc; int final_yield = DELIVER_ATTEMPTED_NORMAL; time_t now = time(NULL); address_item *addr_last = NULL; uschar *filter_message = NULL; int process_recipients = RECIP_ACCEPT; open_db dbblock; open_db *dbm_file; extern int acl_where; uschar *info = queue_run_pid == (pid_t)0 ? string_sprintf("delivering %s", id) : string_sprintf("delivering %s (queue run pid %d)", id, queue_run_pid); /* If the D_process_info bit is on, set_process_info() will output debugging information. If not, we want to show this initial information if D_deliver or D_queue_run is set or in verbose mode. */ set_process_info("%s", info); if ( !(debug_selector & D_process_info) && (debug_selector & (D_deliver|D_queue_run|D_v)) ) debug_printf("%s\n", info); /* Ensure that we catch any subprocesses that are created. Although Exim sets SIG_DFL as its initial default, some routes through the code end up here with it set to SIG_IGN - cases where a non-synchronous delivery process has been forked, but no re-exec has been done. We use sigaction rather than plain signal() on those OS where SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a problem on AIX with this.) */ #ifdef SA_NOCLDWAIT { struct sigaction act; act.sa_handler = SIG_DFL; sigemptyset(&(act.sa_mask)); act.sa_flags = 0; sigaction(SIGCHLD, &act, NULL); } #else signal(SIGCHLD, SIG_DFL); #endif /* Make the forcing flag available for routers and transports, set up the global message id field, and initialize the count for returned files and the message size. This use of strcpy() is OK because the length id is checked when it is obtained from a command line (the -M or -q options), and otherwise it is known to be a valid message id. */ if (id != message_id) Ustrcpy(message_id, id); f.deliver_force = forced; return_count = 0; message_size = 0; /* Initialize some flags */ update_spool = FALSE; remove_journal = TRUE; /* Set a known context for any ACLs we call via expansions */ acl_where = ACL_WHERE_DELIVERY; /* Reset the random number generator, so that if several delivery processes are started from a queue runner that has already used random numbers (for sorting), they don't all get the same sequence. */ random_seed = 0; /* Open and lock the message's data file. Exim locks on this one because the header file may get replaced as it is re-written during the delivery process. Any failures cause messages to be written to the log, except for missing files while queue running - another process probably completed delivery. As part of opening the data file, message_subdir gets set. */ if ((deliver_datafile = spool_open_datafile(id)) < 0) return continue_closedown(); /* yields DELIVER_NOT_ATTEMPTED */ /* The value of message_size at this point has been set to the data length, plus one for the blank line that notionally precedes the data. */ /* Now read the contents of the header file, which will set up the headers in store, and also the list of recipients and the tree of non-recipients and assorted flags. It updates message_size. If there is a reading or format error, give up; if the message has been around for sufficiently long, remove it. */ { uschar * spoolname = string_sprintf("%s-H", id); if ((rc = spool_read_header(spoolname, TRUE, TRUE)) != spool_read_OK) { if (errno == ERRNO_SPOOLFORMAT) { struct stat statbuf; if (Ustat(spool_fname(US"input", message_subdir, spoolname, US""), &statbuf) == 0) log_write(0, LOG_MAIN, "Format error in spool file %s: " "size=" OFF_T_FMT, spoolname, statbuf.st_size); else log_write(0, LOG_MAIN, "Format error in spool file %s", spoolname); } else log_write(0, LOG_MAIN, "Error reading spool file %s: %s", spoolname, strerror(errno)); /* If we managed to read the envelope data, received_time contains the time the message was received. Otherwise, we can calculate it from the message id. */ if (rc != spool_read_hdrerror) { received_time.tv_sec = received_time.tv_usec = 0; /*XXX subsec precision?*/ for (i = 0; i < 6; i++) received_time.tv_sec = received_time.tv_sec * BASE_62 + tab62[id[i] - '0']; } /* If we've had this malformed message too long, sling it. */ if (now - received_time.tv_sec > keep_malformed) { Uunlink(spool_fname(US"msglog", message_subdir, id, US"")); Uunlink(spool_fname(US"input", message_subdir, id, US"-D")); Uunlink(spool_fname(US"input", message_subdir, id, US"-H")); Uunlink(spool_fname(US"input", message_subdir, id, US"-J")); log_write(0, LOG_MAIN, "Message removed because older than %s", readconf_printtime(keep_malformed)); } (void)close(deliver_datafile); deliver_datafile = -1; return continue_closedown(); /* yields DELIVER_NOT_ATTEMPTED */ } } /* The spool header file has been read. Look to see if there is an existing journal file for this message. If there is, it means that a previous delivery attempt crashed (program or host) before it could update the spool header file. Read the list of delivered addresses from the journal and add them to the nonrecipients tree. Then update the spool file. We can leave the journal in existence, as it will get further successful deliveries added to it in this run, and it will be deleted if this function gets to its end successfully. Otherwise it might be needed again. */ { uschar * fname = spool_fname(US"input", message_subdir, id, US"-J"); FILE * jread; if ( (journal_fd = Uopen(fname, O_RDWR|O_APPEND #ifdef O_CLOEXEC | O_CLOEXEC #endif #ifdef O_NOFOLLOW | O_NOFOLLOW #endif , SPOOL_MODE)) >= 0 && lseek(journal_fd, 0, SEEK_SET) == 0 && (jread = fdopen(journal_fd, "rb")) ) { while (Ufgets(big_buffer, big_buffer_size, jread)) { int n = Ustrlen(big_buffer); big_buffer[n-1] = 0; tree_add_nonrecipient(big_buffer); DEBUG(D_deliver) debug_printf("Previously delivered address %s taken from " "journal file\n", big_buffer); } rewind(jread); if ((journal_fd = dup(fileno(jread))) < 0) journal_fd = fileno(jread); else (void) fclose(jread); /* Try to not leak the FILE resource */ /* Panic-dies on error */ (void)spool_write_header(message_id, SW_DELIVERING, NULL); } else if (errno != ENOENT) { log_write(0, LOG_MAIN|LOG_PANIC, "attempt to open journal for reading gave: " "%s", strerror(errno)); return continue_closedown(); /* yields DELIVER_NOT_ATTEMPTED */ } /* A null recipients list indicates some kind of disaster. */ if (!recipients_list) { (void)close(deliver_datafile); deliver_datafile = -1; log_write(0, LOG_MAIN, "Spool error: no recipients for %s", fname); return continue_closedown(); /* yields DELIVER_NOT_ATTEMPTED */ } } /* Handle a message that is frozen. There are a number of different things that can happen, but in the default situation, unless forced, no delivery is attempted. */ if (f.deliver_freeze) { #ifdef SUPPORT_MOVE_FROZEN_MESSAGES /* Moving to another directory removes the message from Exim's view. Other tools must be used to deal with it. Logging of this action happens in spool_move_message() and its subfunctions. */ if ( move_frozen_messages && spool_move_message(id, message_subdir, US"", US"F") ) return continue_closedown(); /* yields DELIVER_NOT_ATTEMPTED */ #endif /* For all frozen messages (bounces or not), timeout_frozen_after sets the maximum time to keep messages that are frozen. Thaw if we reach it, with a flag causing all recipients to be failed. The time is the age of the message, not the time since freezing. */ if (timeout_frozen_after > 0 && message_age >= timeout_frozen_after) { log_write(0, LOG_MAIN, "cancelled by timeout_frozen_after"); process_recipients = RECIP_FAIL_TIMEOUT; } /* For bounce messages (and others with no sender), thaw if the error message ignore timer is exceeded. The message will be discarded if this delivery fails. */ else if (!*sender_address && message_age >= ignore_bounce_errors_after) log_write(0, LOG_MAIN, "Unfrozen by errmsg timer"); /* If this is a bounce message, or there's no auto thaw, or we haven't reached the auto thaw time yet, and this delivery is not forced by an admin user, do not attempt delivery of this message. Note that forced is set for continuing messages down the same channel, in order to skip load checking and ignore hold domains, but we don't want unfreezing in that case. */ else { if ( ( sender_address[0] == 0 || auto_thaw <= 0 || now <= deliver_frozen_at + auto_thaw ) && ( !forced || !f.deliver_force_thaw || !f.admin_user || continue_hostname ) ) { (void)close(deliver_datafile); deliver_datafile = -1; log_write(L_skip_delivery, LOG_MAIN, "Message is frozen"); return continue_closedown(); /* yields DELIVER_NOT_ATTEMPTED */ } /* If delivery was forced (by an admin user), assume a manual thaw. Otherwise it's an auto thaw. */ if (forced) { f.deliver_manual_thaw = TRUE; log_write(0, LOG_MAIN, "Unfrozen by forced delivery"); } else log_write(0, LOG_MAIN, "Unfrozen by auto-thaw"); } /* We get here if any of the rules for unfreezing have triggered. */ f.deliver_freeze = FALSE; update_spool = TRUE; } /* Open the message log file if we are using them. This records details of deliveries, deferments, and failures for the benefit of the mail administrator. The log is not used by exim itself to track the progress of a message; that is done by rewriting the header spool file. */ if (message_logs) { uschar * fname = spool_fname(US"msglog", message_subdir, id, US""); uschar * error; int fd; if ((fd = open_msglog_file(fname, SPOOL_MODE, &error)) < 0) { log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't %s message log %s: %s", error, fname, strerror(errno)); return continue_closedown(); /* yields DELIVER_NOT_ATTEMPTED */ } /* Make a C stream out of it. */ if (!(message_log = fdopen(fd, "a"))) { log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s", fname, strerror(errno)); return continue_closedown(); /* yields DELIVER_NOT_ATTEMPTED */ } } /* If asked to give up on a message, log who did it, and set the action for all the addresses. */ if (give_up) { struct passwd *pw = getpwuid(real_uid); log_write(0, LOG_MAIN, "cancelled by %s", pw ? US pw->pw_name : string_sprintf("uid %ld", (long int)real_uid)); process_recipients = RECIP_FAIL; } /* Otherwise, if there are too many Received: headers, fail all recipients. */ else if (received_count > received_headers_max) process_recipients = RECIP_FAIL_LOOP; /* Otherwise, if a system-wide, address-independent message filter is specified, run it now, except in the case when we are failing all recipients as a result of timeout_frozen_after. If the system filter yields "delivered", then ignore the true recipients of the message. Failure of the filter file is logged, and the delivery attempt fails. */ else if (system_filter && process_recipients != RECIP_FAIL_TIMEOUT) { int rc; int filtertype; ugid_block ugid; redirect_block redirect; if (system_filter_uid_set) { ugid.uid = system_filter_uid; ugid.gid = system_filter_gid; ugid.uid_set = ugid.gid_set = TRUE; } else ugid.uid_set = ugid.gid_set = FALSE; return_path = sender_address; f.enable_dollar_recipients = TRUE; /* Permit $recipients in system filter */ f.system_filtering = TRUE; /* Any error in the filter file causes a delivery to be abandoned. */ redirect.string = system_filter; redirect.isfile = TRUE; redirect.check_owner = redirect.check_group = FALSE; redirect.owners = NULL; redirect.owngroups = NULL; redirect.pw = NULL; redirect.modemask = 0; DEBUG(D_deliver|D_filter) debug_printf("running system filter\n"); rc = rda_interpret( &redirect, /* Where the data is */ RDO_DEFER | /* Turn on all the enabling options */ RDO_FAIL | /* Leave off all the disabling options */ RDO_FILTER | RDO_FREEZE | RDO_REALLOG | RDO_REWRITE, NULL, /* No :include: restriction (not used in filter) */ NULL, /* No sieve vacation directory (not sieve!) */ NULL, /* No sieve enotify mailto owner (not sieve!) */ NULL, /* No sieve user address (not sieve!) */ NULL, /* No sieve subaddress (not sieve!) */ &ugid, /* uid/gid data */ &addr_new, /* Where to hang generated addresses */ &filter_message, /* Where to put error message */ NULL, /* Don't skip syntax errors */ &filtertype, /* Will always be set to FILTER_EXIM for this call */ US"system filter"); /* For error messages */ DEBUG(D_deliver|D_filter) debug_printf("system filter returned %d\n", rc); if (rc == FF_ERROR || rc == FF_NONEXIST) { (void)close(deliver_datafile); deliver_datafile = -1; log_write(0, LOG_MAIN|LOG_PANIC, "Error in system filter: %s", string_printing(filter_message)); return continue_closedown(); /* yields DELIVER_NOT_ATTEMPTED */ } /* Reset things. If the filter message is an empty string, which can happen for a filter "fail" or "freeze" command with no text, reset it to NULL. */ f.system_filtering = FALSE; f.enable_dollar_recipients = FALSE; if (filter_message && filter_message[0] == 0) filter_message = NULL; /* Save the values of the system filter variables so that user filters can use them. */ memcpy(filter_sn, filter_n, sizeof(filter_sn)); /* The filter can request that delivery of the original addresses be deferred. */ if (rc == FF_DEFER) { process_recipients = RECIP_DEFER; deliver_msglog("Delivery deferred by system filter\n"); log_write(0, LOG_MAIN, "Delivery deferred by system filter"); } /* The filter can request that a message be frozen, but this does not take place if the message has been manually thawed. In that case, we must unset "delivered", which is forced by the "freeze" command to make -bF work properly. */ else if (rc == FF_FREEZE && !f.deliver_manual_thaw) { f.deliver_freeze = TRUE; deliver_frozen_at = time(NULL); process_recipients = RECIP_DEFER; frozen_info = string_sprintf(" by the system filter%s%s", filter_message ? US": " : US"", filter_message ? filter_message : US""); } /* The filter can request that a message be failed. The error message may be quite long - it is sent back to the sender in the bounce - but we don't want to fill up the log with repetitions of it. If it starts with << then the text between << and >> is written to the log, with the rest left for the bounce message. */ else if (rc == FF_FAIL) { uschar *colon = US""; uschar *logmsg = US""; int loglen = 0; process_recipients = RECIP_FAIL_FILTER; if (filter_message) { uschar *logend; colon = US": "; if ( filter_message[0] == '<' && filter_message[1] == '<' && (logend = Ustrstr(filter_message, ">>")) ) { logmsg = filter_message + 2; loglen = logend - logmsg; filter_message = logend + 2; if (filter_message[0] == 0) filter_message = NULL; } else { logmsg = filter_message; loglen = Ustrlen(filter_message); } } log_write(0, LOG_MAIN, "cancelled by system filter%s%.*s", colon, loglen, logmsg); } /* Delivery can be restricted only to those recipients (if any) that the filter specified. */ else if (rc == FF_DELIVERED) { process_recipients = RECIP_IGNORE; if (addr_new) log_write(0, LOG_MAIN, "original recipients ignored (system filter)"); else log_write(0, LOG_MAIN, "=> discarded (system filter)"); } /* If any new addresses were created by the filter, fake up a "parent" for them. This is necessary for pipes, etc., which are expected to have parents, and it also gives some sensible logging for others. Allow pipes, files, and autoreplies, and run them as the filter uid if set, otherwise as the current uid. */ if (addr_new) { int uid = system_filter_uid_set ? system_filter_uid : geteuid(); int gid = system_filter_gid_set ? system_filter_gid : getegid(); /* The text "system-filter" is tested in transport_set_up_command() and in set_up_shell_command() in the pipe transport, to enable them to permit $recipients, so don't change it here without also changing it there. */ address_item *p = addr_new; address_item *parent = deliver_make_addr(US"system-filter", FALSE); parent->domain = string_copylc(qualify_domain_recipient); parent->local_part = US"system-filter"; /* As part of this loop, we arrange for addr_last to end up pointing at the final address. This is used if we go on to add addresses for the original recipients. */ while (p) { if (parent->child_count == USHRT_MAX) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "system filter generated more " "than %d delivery addresses", USHRT_MAX); parent->child_count++; p->parent = parent; if (testflag(p, af_pfr)) { uschar *tpname; uschar *type; p->uid = uid; p->gid = gid; setflag(p, af_uid_set); setflag(p, af_gid_set); setflag(p, af_allow_file); setflag(p, af_allow_pipe); setflag(p, af_allow_reply); /* Find the name of the system filter's appropriate pfr transport */ if (p->address[0] == '|') { type = US"pipe"; tpname = system_filter_pipe_transport; address_pipe = p->address; } else if (p->address[0] == '>') { type = US"reply"; tpname = system_filter_reply_transport; } else { if (p->address[Ustrlen(p->address)-1] == '/') { type = US"directory"; tpname = system_filter_directory_transport; } else { type = US"file"; tpname = system_filter_file_transport; } address_file = p->address; } /* Now find the actual transport, first expanding the name. We have set address_file or address_pipe above. */ if (tpname) { uschar *tmp = expand_string(tpname); address_file = address_pipe = NULL; if (!tmp) p->message = string_sprintf("failed to expand \"%s\" as a " "system filter transport name", tpname); if (is_tainted(tmp)) p->message = string_sprintf("attempt to used tainted value '%s' for" "transport '%s' as a system filter", tmp, tpname); tpname = tmp; } else p->message = string_sprintf("system_filter_%s_transport is unset", type); if (tpname) { transport_instance *tp; for (tp = transports; tp; tp = tp->next) if (Ustrcmp(tp->name, tpname) == 0) { p->transport = tp; break; } if (!tp) p->message = string_sprintf("failed to find \"%s\" transport " "for system filter delivery", tpname); } /* If we couldn't set up a transport, defer the delivery, putting the error on the panic log as well as the main log. */ if (!p->transport) { address_item *badp = p; p = p->next; if (!addr_last) addr_new = p; else addr_last->next = p; badp->local_part = badp->address; /* Needed for log line */ post_process_one(badp, DEFER, LOG_MAIN|LOG_PANIC, EXIM_DTYPE_ROUTER, 0); continue; } } /* End of pfr handling */ /* Either a non-pfr delivery, or we found a transport */ DEBUG(D_deliver|D_filter) debug_printf("system filter added %s\n", p->address); addr_last = p; p = p->next; } /* Loop through all addr_new addresses */ } } /* Scan the recipients list, and for every one that is not in the non- recipients tree, add an addr item to the chain of new addresses. If the pno value is non-negative, we must set the onetime parent from it. This which points to the relevant entry in the recipients list. This processing can be altered by the setting of the process_recipients variable, which is changed if recipients are to be ignored, failed, or deferred. This can happen as a result of system filter activity, or if the -Mg option is used to fail all of them. Duplicate addresses are handled later by a different tree structure; we can't just extend the non-recipients tree, because that will be re-written to the spool if the message is deferred, and in any case there are casing complications for local addresses. */ if (process_recipients != RECIP_IGNORE) for (i = 0; i < recipients_count; i++) if (!tree_search(tree_nonrecipients, recipients_list[i].address)) { recipient_item *r = recipients_list + i; address_item *new = deliver_make_addr(r->address, FALSE); new->prop.errors_address = r->errors_to; #ifdef SUPPORT_I18N if ((new->prop.utf8_msg = message_smtputf8)) { new->prop.utf8_downcvt = message_utf8_downconvert == 1; new->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; DEBUG(D_deliver) debug_printf("utf8, downconvert %s\n", new->prop.utf8_downcvt ? "yes" : new->prop.utf8_downcvt_maybe ? "ifneeded" : "no"); } #endif if (r->pno >= 0) new->onetime_parent = recipients_list[r->pno].address; /* If DSN support is enabled, set the dsn flags and the original receipt to be passed on to other DSN enabled MTAs */ new->dsn_flags = r->dsn_flags & rf_dsnflags; new->dsn_orcpt = r->orcpt; DEBUG(D_deliver) debug_printf("DSN: set orcpt: %s flags: 0x%x\n", new->dsn_orcpt ? new->dsn_orcpt : US"", new->dsn_flags); switch (process_recipients) { /* RECIP_DEFER is set when a system filter freezes a message. */ case RECIP_DEFER: new->next = addr_defer; addr_defer = new; break; /* RECIP_FAIL_FILTER is set when a system filter has obeyed a "fail" command. */ case RECIP_FAIL_FILTER: new->message = filter_message ? filter_message : US"delivery cancelled"; setflag(new, af_pass_message); goto RECIP_QUEUE_FAILED; /* below */ /* RECIP_FAIL_TIMEOUT is set when a message is frozen, but is older than the value in timeout_frozen_after. Treat non-bounce messages similarly to -Mg; for bounce messages we just want to discard, so don't put the address on the failed list. The timeout has already been logged. */ case RECIP_FAIL_TIMEOUT: new->message = US"delivery cancelled; message timed out"; goto RECIP_QUEUE_FAILED; /* below */ /* RECIP_FAIL is set when -Mg has been used. */ case RECIP_FAIL: new->message = US"delivery cancelled by administrator"; /* Fall through */ /* Common code for the failure cases above. If this is not a bounce message, put the address on the failed list so that it is used to create a bounce. Otherwise do nothing - this just discards the address. The incident has already been logged. */ RECIP_QUEUE_FAILED: if (sender_address[0]) { new->next = addr_failed; addr_failed = new; } break; /* RECIP_FAIL_LOOP is set when there are too many Received: headers in the message. Process each address as a routing failure; if this is a bounce message, it will get frozen. */ case RECIP_FAIL_LOOP: new->message = US"Too many \"Received\" headers - suspected mail loop"; post_process_one(new, FAIL, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); break; /* Value should be RECIP_ACCEPT; take this as the safe default. */ default: if (!addr_new) addr_new = new; else addr_last->next = new; addr_last = new; break; } #ifndef DISABLE_EVENT if (process_recipients != RECIP_ACCEPT && event_action) { uschar * save_local = deliver_localpart; const uschar * save_domain = deliver_domain; uschar * addr = new->address, * errmsg = NULL; int start, end, dom; if (!parse_extract_address(addr, &errmsg, &start, &end, &dom, TRUE)) log_write(0, LOG_MAIN|LOG_PANIC, "failed to parse address '%.100s': %s\n", addr, errmsg); else { deliver_localpart = string_copyn(addr+start, dom ? (dom-1) - start : end - start); deliver_domain = dom ? CUS string_copyn(addr+dom, end - dom) : CUS""; event_raise(event_action, US"msg:fail:internal", new->message); deliver_localpart = save_local; deliver_domain = save_domain; } } #endif } DEBUG(D_deliver) { debug_printf("Delivery address list:\n"); for (address_item * p = addr_new; p; p = p->next) debug_printf(" %s %s\n", p->address, p->onetime_parent ? p->onetime_parent : US""); } /* Set up the buffers used for copying over the file when delivering. */ deliver_in_buffer = store_malloc(DELIVER_IN_BUFFER_SIZE); deliver_out_buffer = store_malloc(DELIVER_OUT_BUFFER_SIZE); /* Until there are no more new addresses, handle each one as follows: . If this is a generated address (indicated by the presence of a parent pointer) then check to see whether it is a pipe, file, or autoreply, and if so, handle it directly here. The router that produced the address will have set the allow flags into the address, and also set the uid/gid required. Having the routers generate new addresses and then checking them here at the outer level is tidier than making each router do the checking, and means that routers don't need access to the failed address queue. . Break up the address into local part and domain, and make lowercased versions of these strings. We also make unquoted versions of the local part. . Handle the percent hack for those domains for which it is valid. . For child addresses, determine if any of the parents have the same address. If so, generate a different string for previous delivery checking. Without this code, if the address spqr generates spqr via a forward or alias file, delivery of the generated spqr stops further attempts at the top level spqr, which is not what is wanted - it may have generated other addresses. . Check on the retry database to see if routing was previously deferred, but only if in a queue run. Addresses that are to be routed are put on the addr_route chain. Addresses that are to be deferred are put on the addr_defer chain. We do all the checking first, so as not to keep the retry database open any longer than necessary. . Now we run the addresses through the routers. A router may put the address on either the addr_local or the addr_remote chain for local or remote delivery, respectively, or put it on the addr_failed chain if it is undeliveable, or it may generate child addresses and put them on the addr_new chain, or it may defer an address. All the chain anchors are passed as arguments so that the routers can be called for verification purposes as well. . If new addresses have been generated by the routers, da capo. */ f.header_rewritten = FALSE; /* No headers rewritten yet */ while (addr_new) /* Loop until all addresses dealt with */ { address_item *addr, *parent; /* Failure to open the retry database is treated the same as if it does not exist. In both cases, dbm_file is NULL. */ if (!(dbm_file = dbfn_open(US"retry", O_RDONLY, &dbblock, FALSE, TRUE))) DEBUG(D_deliver|D_retry|D_route|D_hints_lookup) debug_printf("no retry data available\n"); /* Scan the current batch of new addresses, to handle pipes, files and autoreplies, and determine which others are ready for routing. */ while (addr_new) { int rc; uschar *p; tree_node *tnode; dbdata_retry *domain_retry_record; dbdata_retry *address_retry_record; addr = addr_new; addr_new = addr->next; DEBUG(D_deliver|D_retry|D_route) { debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); debug_printf("Considering: %s\n", addr->address); } /* Handle generated address that is a pipe or a file or an autoreply. */ if (testflag(addr, af_pfr)) { /* If an autoreply in a filter could not generate a syntactically valid address, give up forthwith. Set af_ignore_error so that we don't try to generate a bounce. */ if (testflag(addr, af_bad_reply)) { addr->basic_errno = ERRNO_BADADDRESS2; addr->local_part = addr->address; addr->message = US"filter autoreply generated syntactically invalid recipient"; addr->prop.ignore_error = TRUE; (void) post_process_one(addr, FAIL, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); continue; /* with the next new address */ } /* If two different users specify delivery to the same pipe or file or autoreply, there should be two different deliveries, so build a unique string that incorporates the original address, and use this for duplicate testing and recording delivery, and also for retrying. */ addr->unique = string_sprintf("%s:%s", addr->address, addr->parent->unique + (testflag(addr->parent, af_homonym)? 3:0)); addr->address_retry_key = addr->domain_retry_key = string_sprintf("T:%s", addr->unique); /* If a filter file specifies two deliveries to the same pipe or file, we want to de-duplicate, but this is probably not wanted for two mail commands to the same address, where probably both should be delivered. So, we have to invent a different unique string in that case. Just keep piling '>' characters on the front. */ if (addr->address[0] == '>') while (tree_search(tree_duplicates, addr->unique)) addr->unique = string_sprintf(">%s", addr->unique); else if ((tnode = tree_search(tree_duplicates, addr->unique))) { DEBUG(D_deliver|D_route) debug_printf("%s is a duplicate address: discarded\n", addr->address); addr->dupof = tnode->data.ptr; addr->next = addr_duplicate; addr_duplicate = addr; continue; } DEBUG(D_deliver|D_route) debug_printf("unique = %s\n", addr->unique); /* Check for previous delivery */ if (tree_search(tree_nonrecipients, addr->unique)) { DEBUG(D_deliver|D_route) debug_printf("%s was previously delivered: discarded\n", addr->address); child_done(addr, tod_stamp(tod_log)); continue; } /* Save for checking future duplicates */ tree_add_duplicate(addr->unique, addr); /* Set local part and domain */ addr->local_part = addr->address; addr->domain = addr->parent->domain; /* Ensure that the delivery is permitted. */ if (testflag(addr, af_file)) { if (!testflag(addr, af_allow_file)) { addr->basic_errno = ERRNO_FORBIDFILE; addr->message = US"delivery to file forbidden"; (void)post_process_one(addr, FAIL, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); continue; /* with the next new address */ } } else if (addr->address[0] == '|') { if (!testflag(addr, af_allow_pipe)) { addr->basic_errno = ERRNO_FORBIDPIPE; addr->message = US"delivery to pipe forbidden"; (void)post_process_one(addr, FAIL, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); continue; /* with the next new address */ } } else if (!testflag(addr, af_allow_reply)) { addr->basic_errno = ERRNO_FORBIDREPLY; addr->message = US"autoreply forbidden"; (void)post_process_one(addr, FAIL, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); continue; /* with the next new address */ } /* If the errno field is already set to BADTRANSPORT, it indicates failure to expand a transport string, or find the associated transport, or an unset transport when one is required. Leave this test till now so that the forbid errors are given in preference. */ if (addr->basic_errno == ERRNO_BADTRANSPORT) { (void)post_process_one(addr, DEFER, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); continue; } /* Treat /dev/null as a special case and abandon the delivery. This avoids having to specify a uid on the transport just for this case. Arrange for the transport name to be logged as "**bypassed**". */ if (Ustrcmp(addr->address, "/dev/null") == 0) { uschar *save = addr->transport->name; addr->transport->name = US"**bypassed**"; (void)post_process_one(addr, OK, LOG_MAIN, EXIM_DTYPE_TRANSPORT, '='); addr->transport->name = save; continue; /* with the next new address */ } /* Pipe, file, or autoreply delivery is to go ahead as a normal local delivery. */ DEBUG(D_deliver|D_route) debug_printf("queued for %s transport\n", addr->transport->name); addr->next = addr_local; addr_local = addr; continue; /* with the next new address */ } /* Handle normal addresses. First, split up into local part and domain, handling the %-hack if necessary. There is the possibility of a defer from a lookup in percent_hack_domains. */ if ((rc = deliver_split_address(addr)) == DEFER) { addr->message = US"cannot check percent_hack_domains"; addr->basic_errno = ERRNO_LISTDEFER; (void)post_process_one(addr, DEFER, LOG_MAIN, EXIM_DTYPE_NONE, 0); continue; } /* Check to see if the domain is held. If so, proceed only if the delivery was forced by hand. */ deliver_domain = addr->domain; /* set $domain */ if ( !forced && hold_domains && (rc = match_isinlist(addr->domain, (const uschar **)&hold_domains, 0, &domainlist_anchor, addr->domain_cache, MCL_DOMAIN, TRUE, NULL)) != FAIL ) { if (rc == DEFER) { addr->message = US"hold_domains lookup deferred"; addr->basic_errno = ERRNO_LISTDEFER; } else { addr->message = US"domain is held"; addr->basic_errno = ERRNO_HELD; } (void)post_process_one(addr, DEFER, LOG_MAIN, EXIM_DTYPE_NONE, 0); continue; } /* Now we can check for duplicates and previously delivered addresses. In order to do this, we have to generate a "unique" value for each address, because there may be identical actual addresses in a line of descendents. The "unique" field is initialized to the same value as the "address" field, but gets changed here to cope with identically-named descendents. */ for (parent = addr->parent; parent; parent = parent->parent) if (strcmpic(addr->address, parent->address) == 0) break; /* If there's an ancestor with the same name, set the homonym flag. This influences how deliveries are recorded. Then add a prefix on the front of the unique address. We use \n\ where n starts at 0 and increases each time. It is unlikely to pass 9, but if it does, it may look odd but will still work. This means that siblings or cousins with the same names are treated as duplicates, which is what we want. */ if (parent) { setflag(addr, af_homonym); if (parent->unique[0] != '\\') addr->unique = string_sprintf("\\0\\%s", addr->address); else addr->unique = string_sprintf("\\%c\\%s", parent->unique[1] + 1, addr->address); } /* Ensure that the domain in the unique field is lower cased, because domains are always handled caselessly. */ p = Ustrrchr(addr->unique, '@'); while (*p != 0) { *p = tolower(*p); p++; } DEBUG(D_deliver|D_route) debug_printf("unique = %s\n", addr->unique); if (tree_search(tree_nonrecipients, addr->unique)) { DEBUG(D_deliver|D_route) debug_printf("%s was previously delivered: discarded\n", addr->unique); child_done(addr, tod_stamp(tod_log)); continue; } /* Get the routing retry status, saving the two retry keys (with and without the local part) for subsequent use. If there is no retry record for the standard address routing retry key, we look for the same key with the sender attached, because this form is used by the smtp transport after a 4xx response to RCPT when address_retry_include_sender is true. */ addr->domain_retry_key = string_sprintf("R:%s", addr->domain); addr->address_retry_key = string_sprintf("R:%s@%s", addr->local_part, addr->domain); if (dbm_file) { domain_retry_record = dbfn_read(dbm_file, addr->domain_retry_key); if ( domain_retry_record && now - domain_retry_record->time_stamp > retry_data_expire ) { DEBUG(D_deliver|D_retry) debug_printf("domain retry record present but expired\n"); domain_retry_record = NULL; /* Ignore if too old */ } address_retry_record = dbfn_read(dbm_file, addr->address_retry_key); if ( address_retry_record && now - address_retry_record->time_stamp > retry_data_expire ) { DEBUG(D_deliver|D_retry) debug_printf("address retry record present but expired\n"); address_retry_record = NULL; /* Ignore if too old */ } if (!address_retry_record) { uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, sender_address); address_retry_record = dbfn_read(dbm_file, altkey); if ( address_retry_record && now - address_retry_record->time_stamp > retry_data_expire) { DEBUG(D_deliver|D_retry) debug_printf("address retry record present but expired\n"); address_retry_record = NULL; /* Ignore if too old */ } } } else domain_retry_record = address_retry_record = NULL; DEBUG(D_deliver|D_retry) { if (!domain_retry_record) debug_printf("no domain retry record\n"); else debug_printf("have domain retry record; next_try = now%+d\n", f.running_in_test_harness ? 0 : (int)(domain_retry_record->next_try - now)); if (!address_retry_record) debug_printf("no address retry record\n"); else debug_printf("have address retry record; next_try = now%+d\n", f.running_in_test_harness ? 0 : (int)(address_retry_record->next_try - now)); } /* If we are sending a message down an existing SMTP connection, we must assume that the message which created the connection managed to route an address to that connection. We do not want to run the risk of taking a long time over routing here, because if we do, the server at the other end of the connection may time it out. This is especially true for messages with lots of addresses. For this kind of delivery, queue_running is not set, so we would normally route all addresses. We take a pragmatic approach and defer routing any addresses that have any kind of domain retry record. That is, we don't even look at their retry times. It doesn't matter if this doesn't work occasionally. This is all just an optimization, after all. The reason for not doing the same for address retries is that they normally arise from 4xx responses, not DNS timeouts. */ if (continue_hostname && domain_retry_record) { addr->message = US"reusing SMTP connection skips previous routing defer"; addr->basic_errno = ERRNO_RRETRY; (void)post_process_one(addr, DEFER, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); addr->message = domain_retry_record->text; setflag(addr, af_pass_message); } /* If we are in a queue run, defer routing unless there is no retry data or we've passed the next retry time, or this message is forced. In other words, ignore retry data when not in a queue run. However, if the domain retry time has expired, always allow the routing attempt. If it fails again, the address will be failed. This ensures that each address is routed at least once, even after long-term routing failures. If there is an address retry, check that too; just wait for the next retry time. This helps with the case when the temporary error on the address was really message-specific rather than address specific, since it allows other messages through. We also wait for the next retry time if this is a message sent down an existing SMTP connection (even though that will be forced). Otherwise there will be far too many attempts for an address that gets a 4xx error. In fact, after such an error, we should not get here because, the host should not be remembered as one this message needs. However, there was a bug that used to cause this to happen, so it is best to be on the safe side. Even if we haven't reached the retry time in the hints, there is one more check to do, which is for the ultimate address timeout. We only do this check if there is an address retry record and there is not a domain retry record; this implies that previous attempts to handle the address had the retry_use_local_parts option turned on. We use this as an approximation for the destination being like a local delivery, for example delivery over LMTP to an IMAP message store. In this situation users are liable to bump into their quota and thereby have intermittently successful deliveries, which keep the retry record fresh, which can lead to us perpetually deferring messages. */ else if ( ( f.queue_running && !f.deliver_force || continue_hostname ) && ( ( domain_retry_record && now < domain_retry_record->next_try && !domain_retry_record->expired ) || ( address_retry_record && now < address_retry_record->next_try ) ) && ( domain_retry_record || !address_retry_record || !retry_ultimate_address_timeout(addr->address_retry_key, addr->domain, address_retry_record, now) ) ) { addr->message = US"retry time not reached"; addr->basic_errno = ERRNO_RRETRY; (void)post_process_one(addr, DEFER, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); /* For remote-retry errors (here and just above) that we've not yet hit the retry time, use the error recorded in the retry database as info in the warning message. This lets us send a message even when we're not failing on a fresh attempt. We assume that this info is not sensitive. */ addr->message = domain_retry_record ? domain_retry_record->text : address_retry_record->text; setflag(addr, af_pass_message); } /* The domain is OK for routing. Remember if retry data exists so it can be cleaned up after a successful delivery. */ else { if (domain_retry_record || address_retry_record) setflag(addr, af_dr_retry_exists); addr->next = addr_route; addr_route = addr; DEBUG(D_deliver|D_route) debug_printf("%s: queued for routing\n", addr->address); } } /* The database is closed while routing is actually happening. Requests to update it are put on a chain and all processed together at the end. */ if (dbm_file) dbfn_close(dbm_file); /* If queue_domains is set, we don't even want to try routing addresses in those domains. During queue runs, queue_domains is forced to be unset. Optimize by skipping this pass through the addresses if nothing is set. */ if (!f.deliver_force && queue_domains) { address_item *okaddr = NULL; while (addr_route) { address_item *addr = addr_route; addr_route = addr->next; deliver_domain = addr->domain; /* set $domain */ if ((rc = match_isinlist(addr->domain, (const uschar **)&queue_domains, 0, &domainlist_anchor, addr->domain_cache, MCL_DOMAIN, TRUE, NULL)) != OK) if (rc == DEFER) { addr->basic_errno = ERRNO_LISTDEFER; addr->message = US"queue_domains lookup deferred"; (void)post_process_one(addr, DEFER, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); } else { addr->next = okaddr; okaddr = addr; } else { addr->basic_errno = ERRNO_QUEUE_DOMAIN; addr->message = US"domain is in queue_domains"; (void)post_process_one(addr, DEFER, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); } } addr_route = okaddr; } /* Now route those addresses that are not deferred. */ while (addr_route) { int rc; address_item *addr = addr_route; const uschar *old_domain = addr->domain; uschar *old_unique = addr->unique; addr_route = addr->next; addr->next = NULL; /* Just in case some router parameter refers to it. */ if (!(return_path = addr->prop.errors_address)) return_path = sender_address; /* If a router defers an address, add a retry item. Whether or not to use the local part in the key is a property of the router. */ if ((rc = route_address(addr, &addr_local, &addr_remote, &addr_new, &addr_succeed, v_none)) == DEFER) retry_add_item(addr, addr->router->retry_use_local_part ? string_sprintf("R:%s@%s", addr->local_part, addr->domain) : string_sprintf("R:%s", addr->domain), 0); /* Otherwise, if there is an existing retry record in the database, add retry items to delete both forms. We must also allow for the possibility of a routing retry that includes the sender address. Since the domain might have been rewritten (expanded to fully qualified) as a result of routing, ensure that the rewritten form is also deleted. */ else if (testflag(addr, af_dr_retry_exists)) { uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, sender_address); retry_add_item(addr, altkey, rf_delete); retry_add_item(addr, addr->address_retry_key, rf_delete); retry_add_item(addr, addr->domain_retry_key, rf_delete); if (Ustrcmp(addr->domain, old_domain) != 0) retry_add_item(addr, string_sprintf("R:%s", old_domain), rf_delete); } /* DISCARD is given for :blackhole: and "seen finish". The event has been logged, but we need to ensure the address (and maybe parents) is marked done. */ if (rc == DISCARD) { address_done(addr, tod_stamp(tod_log)); continue; /* route next address */ } /* The address is finished with (failed or deferred). */ if (rc != OK) { (void)post_process_one(addr, rc, LOG_MAIN, EXIM_DTYPE_ROUTER, 0); continue; /* route next address */ } /* The address has been routed. If the router changed the domain, it will also have changed the unique address. We have to test whether this address has already been delivered, because it's the unique address that finally gets recorded. */ if ( addr->unique != old_unique && tree_search(tree_nonrecipients, addr->unique) != 0 ) { DEBUG(D_deliver|D_route) debug_printf("%s was previously delivered: " "discarded\n", addr->address); if (addr_remote == addr) addr_remote = addr->next; else if (addr_local == addr) addr_local = addr->next; } /* If the router has same_domain_copy_routing set, we are permitted to copy the routing for any other addresses with the same domain. This is an optimisation to save repeated DNS lookups for "standard" remote domain routing. The option is settable only on routers that generate host lists. We play it very safe, and do the optimization only if the address is routed to a remote transport, there are no header changes, and the domain was not modified by the router. */ if ( addr_remote == addr && addr->router->same_domain_copy_routing && !addr->prop.extra_headers && !addr->prop.remove_headers && old_domain == addr->domain ) { address_item **chain = &addr_route; while (*chain) { address_item *addr2 = *chain; if (Ustrcmp(addr2->domain, addr->domain) != 0) { chain = &(addr2->next); continue; } /* Found a suitable address; take it off the routing list and add it to the remote delivery list. */ *chain = addr2->next; addr2->next = addr_remote; addr_remote = addr2; /* Copy the routing data */ addr2->domain = addr->domain; addr2->router = addr->router; addr2->transport = addr->transport; addr2->host_list = addr->host_list; addr2->fallback_hosts = addr->fallback_hosts; addr2->prop.errors_address = addr->prop.errors_address; copyflag(addr2, addr, af_hide_child); copyflag(addr2, addr, af_local_host_removed); DEBUG(D_deliver|D_route) debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n" "routing %s\n" "Routing for %s copied from %s\n", addr2->address, addr2->address, addr->address); } } } /* Continue with routing the next address. */ } /* Loop to process any child addresses that the routers created, and any rerouted addresses that got put back on the new chain. */ /* Debugging: show the results of the routing */ DEBUG(D_deliver|D_retry|D_route) { debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n"); debug_printf("After routing:\n Local deliveries:\n"); for (address_item * p = addr_local; p; p = p->next) debug_printf(" %s\n", p->address); debug_printf(" Remote deliveries:\n"); for (address_item * p = addr_remote; p; p = p->next) debug_printf(" %s\n", p->address); debug_printf(" Failed addresses:\n"); for (address_item * p = addr_failed; p; p = p->next) debug_printf(" %s\n", p->address); debug_printf(" Deferred addresses:\n"); for (address_item * p = addr_defer; p; p = p->next) debug_printf(" %s\n", p->address); } /* Free any resources that were cached during routing. */ search_tidyup(); route_tidyup(); /* These two variables are set only during routing, after check_local_user. Ensure they are not set in transports. */ local_user_gid = (gid_t)(-1); local_user_uid = (uid_t)(-1); /* Check for any duplicate addresses. This check is delayed until after routing, because the flexibility of the routing configuration means that identical addresses with different parentage may end up being redirected to different addresses. Checking for duplicates too early (as we previously used to) makes this kind of thing not work. */ do_duplicate_check(&addr_local); do_duplicate_check(&addr_remote); /* When acting as an MUA wrapper, we proceed only if all addresses route to a remote transport. The check that they all end up in one transaction happens in the do_remote_deliveries() function. */ if ( mua_wrapper && (addr_local || addr_failed || addr_defer) ) { address_item *addr; uschar *which, *colon, *msg; if (addr_local) { addr = addr_local; which = US"local"; } else if (addr_defer) { addr = addr_defer; which = US"deferred"; } else { addr = addr_failed; which = US"failed"; } while (addr->parent) addr = addr->parent; if (addr->message) { colon = US": "; msg = addr->message; } else colon = msg = US""; /* We don't need to log here for a forced failure as it will already have been logged. Defer will also have been logged, but as a defer, so we do need to do the failure logging. */ if (addr != addr_failed) log_write(0, LOG_MAIN, "** %s routing yielded a %s delivery", addr->address, which); /* Always write an error to the caller */ fprintf(stderr, "routing %s yielded a %s delivery%s%s\n", addr->address, which, colon, msg); final_yield = DELIVER_MUA_FAILED; addr_failed = addr_defer = NULL; /* So that we remove the message */ goto DELIVERY_TIDYUP; } /* If this is a run to continue deliveries to an external channel that is already set up, defer any local deliveries. */ if (continue_transport) { if (addr_defer) { address_item *addr = addr_defer; while (addr->next) addr = addr->next; addr->next = addr_local; } else addr_defer = addr_local; addr_local = NULL; } /* Because address rewriting can happen in the routers, we should not really do ANY deliveries until all addresses have been routed, so that all recipients of the message get the same headers. However, this is in practice not always possible, since sometimes remote addresses give DNS timeouts for days on end. The pragmatic approach is to deliver what we can now, saving any rewritten headers so that at least the next lot of recipients benefit from the rewriting that has already been done. If any headers have been rewritten during routing, update the spool file to remember them for all subsequent deliveries. This can be delayed till later if there is only address to be delivered - if it succeeds the spool write need not happen. */ if ( f.header_rewritten && ( addr_local && (addr_local->next || addr_remote) || addr_remote && addr_remote->next ) ) { /* Panic-dies on error */ (void)spool_write_header(message_id, SW_DELIVERING, NULL); f.header_rewritten = FALSE; } /* If there are any deliveries to do and we do not already have the journal file, create it. This is used to record successful deliveries as soon as possible after each delivery is known to be complete. A file opened with O_APPEND is used so that several processes can run simultaneously. The journal is just insurance against crashes. When the spool file is ultimately updated at the end of processing, the journal is deleted. If a journal is found to exist at the start of delivery, the addresses listed therein are added to the non-recipients. */ if (addr_local || addr_remote) { if (journal_fd < 0) { uschar * fname = spool_fname(US"input", message_subdir, id, US"-J"); if ((journal_fd = Uopen(fname, #ifdef O_CLOEXEC O_CLOEXEC | #endif O_WRONLY|O_APPEND|O_CREAT|O_EXCL, SPOOL_MODE)) < 0) { log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open journal file %s: %s", fname, strerror(errno)); return DELIVER_NOT_ATTEMPTED; } /* Set the close-on-exec flag, make the file owned by Exim, and ensure that the mode is correct - the group setting doesn't always seem to get set automatically. */ if( exim_fchown(journal_fd, exim_uid, exim_gid, fname) || fchmod(journal_fd, SPOOL_MODE) #ifndef O_CLOEXEC || fcntl(journal_fd, F_SETFD, fcntl(journal_fd, F_GETFD) | FD_CLOEXEC) #endif ) { int ret = Uunlink(fname); log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't set perms on journal file %s: %s", fname, strerror(errno)); if(ret && errno != ENOENT) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to unlink %s: %s", fname, strerror(errno)); return DELIVER_NOT_ATTEMPTED; } } } else if (journal_fd >= 0) { close(journal_fd); journal_fd = -1; } /* Now we can get down to the business of actually doing deliveries. Local deliveries are done first, then remote ones. If ever the problems of how to handle fallback transports are figured out, this section can be put into a loop for handling fallbacks, though the uid switching will have to be revised. */ /* Precompile a regex that is used to recognize a parameter in response to an LHLO command, if is isn't already compiled. This may be used on both local and remote LMTP deliveries. */ if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA = regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE); /* Handle local deliveries */ if (addr_local) { DEBUG(D_deliver|D_transport) debug_printf(">>>>>>>>>>>>>>>> Local deliveries >>>>>>>>>>>>>>>>\n"); do_local_deliveries(); f.disable_logging = FALSE; } /* If queue_run_local is set, we do not want to attempt any remote deliveries, so just queue them all. */ if (f.queue_run_local) while (addr_remote) { address_item *addr = addr_remote; addr_remote = addr->next; addr->next = NULL; addr->basic_errno = ERRNO_LOCAL_ONLY; addr->message = US"remote deliveries suppressed"; (void)post_process_one(addr, DEFER, LOG_MAIN, EXIM_DTYPE_TRANSPORT, 0); } /* Handle remote deliveries */ if (addr_remote) { DEBUG(D_deliver|D_transport) debug_printf(">>>>>>>>>>>>>>>> Remote deliveries >>>>>>>>>>>>>>>>\n"); /* Precompile some regex that are used to recognize parameters in response to an EHLO command, if they aren't already compiled. */ deliver_init(); /* Now sort the addresses if required, and do the deliveries. The yield of do_remote_deliveries is FALSE when mua_wrapper is set and all addresses cannot be delivered in one transaction. */ if (remote_sort_domains) sort_remote_deliveries(); if (!do_remote_deliveries(FALSE)) { log_write(0, LOG_MAIN, "** mua_wrapper is set but recipients cannot all " "be delivered in one transaction"); fprintf(stderr, "delivery to smarthost failed (configuration problem)\n"); final_yield = DELIVER_MUA_FAILED; addr_failed = addr_defer = NULL; /* So that we remove the message */ goto DELIVERY_TIDYUP; } /* See if any of the addresses that failed got put on the queue for delivery to their fallback hosts. We do it this way because often the same fallback host is used for many domains, so all can be sent in a single transaction (if appropriately configured). */ if (addr_fallback && !mua_wrapper) { DEBUG(D_deliver) debug_printf("Delivering to fallback hosts\n"); addr_remote = addr_fallback; addr_fallback = NULL; if (remote_sort_domains) sort_remote_deliveries(); do_remote_deliveries(TRUE); } f.disable_logging = FALSE; } /* All deliveries are now complete. Ignore SIGTERM during this tidying up phase, to minimize cases of half-done things. */ DEBUG(D_deliver) debug_printf(">>>>>>>>>>>>>>>> deliveries are done >>>>>>>>>>>>>>>>\n"); cancel_cutthrough_connection(TRUE, US"deliveries are done"); /* Root privilege is no longer needed */ exim_setugid(exim_uid, exim_gid, FALSE, US"post-delivery tidying"); set_process_info("tidying up after delivering %s", message_id); signal(SIGTERM, SIG_IGN); /* When we are acting as an MUA wrapper, the smtp transport will either have succeeded for all addresses, or failed them all in normal cases. However, there are some setup situations (e.g. when a named port does not exist) that cause an immediate exit with deferral of all addresses. Convert those into failures. We do not ever want to retry, nor do we want to send a bounce message. */ if (mua_wrapper) { if (addr_defer) { address_item * nextaddr; for (address_item * addr = addr_defer; addr; addr = nextaddr) { log_write(0, LOG_MAIN, "** %s mua_wrapper forced failure for deferred " "delivery", addr->address); nextaddr = addr->next; addr->next = addr_failed; addr_failed = addr; } addr_defer = NULL; } /* Now all should either have succeeded or failed. */ if (!addr_failed) final_yield = DELIVER_MUA_SUCCEEDED; else { host_item * host; uschar *s = addr_failed->user_message; if (!s) s = addr_failed->message; fprintf(stderr, "Delivery failed: "); if (addr_failed->basic_errno > 0) { fprintf(stderr, "%s", strerror(addr_failed->basic_errno)); if (s) fprintf(stderr, ": "); } if ((host = addr_failed->host_used)) fprintf(stderr, "H=%s [%s]: ", host->name, host->address); if (s) fprintf(stderr, "%s", CS s); else if (addr_failed->basic_errno <= 0) fprintf(stderr, "unknown error"); fprintf(stderr, "\n"); final_yield = DELIVER_MUA_FAILED; addr_failed = NULL; } } /* In a normal configuration, we now update the retry database. This is done in one fell swoop at the end in order not to keep opening and closing (and locking) the database. The code for handling retries is hived off into a separate module for convenience. We pass it the addresses of the various chains, because deferred addresses can get moved onto the failed chain if the retry cutoff time has expired for all alternative destinations. Bypass the updating of the database if the -N flag is set, which is a debugging thing that prevents actual delivery. */ else if (!f.dont_deliver) retry_update(&addr_defer, &addr_failed, &addr_succeed); /* Send DSN for successful messages if requested */ addr_senddsn = NULL; for (address_item * a = addr_succeed; a; a = a->next) { /* af_ignore_error not honored here. it's not an error */ DEBUG(D_deliver) debug_printf("DSN: processing router : %s\n" "DSN: processing successful delivery address: %s\n" "DSN: Sender_address: %s\n" "DSN: orcpt: %s flags: 0x%x\n" "DSN: envid: %s ret: %d\n" "DSN: Final recipient: %s\n" "DSN: Remote SMTP server supports DSN: %d\n", a->router ? a->router->name : US"(unknown)", a->address, sender_address, a->dsn_orcpt ? a->dsn_orcpt : US"NULL", a->dsn_flags, dsn_envid ? dsn_envid : US"NULL", dsn_ret, a->address, a->dsn_aware ); /* send report if next hop not DSN aware or a router flagged "last DSN hop" and a report was requested */ if ( ( a->dsn_aware != dsn_support_yes || a->dsn_flags & rf_dsnlasthop ) && a->dsn_flags & rf_notify_success ) { /* copy and relink address_item and send report with all of them at once later */ address_item * addr_next = addr_senddsn; addr_senddsn = store_get(sizeof(address_item), FALSE); *addr_senddsn = *a; addr_senddsn->next = addr_next; } else DEBUG(D_deliver) debug_printf("DSN: not sending DSN success message\n"); } if (addr_senddsn) { pid_t pid; int fd; /* create exim process to send message */ pid = child_open_exim(&fd); DEBUG(D_deliver) debug_printf("DSN: child_open_exim returns: %d\n", pid); if (pid < 0) /* Creation of child failed */ { log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Process %d (parent %d) failed to " "create child process to send failure message: %s", getpid(), getppid(), strerror(errno)); DEBUG(D_deliver) debug_printf("DSN: child_open_exim failed\n"); } else /* Creation of child succeeded */ { FILE * f = fdopen(fd, "wb"); /* header only as required by RFC. only failure DSN needs to honor RET=FULL */ uschar * bound; transport_ctx tctx = {{0}}; DEBUG(D_deliver) debug_printf("sending error message to: %s\n", sender_address); /* build unique id for MIME boundary */ bound = string_sprintf(TIME_T_FMT "-eximdsn-%d", time(NULL), rand()); DEBUG(D_deliver) debug_printf("DSN: MIME boundary: %s\n", bound); if (errors_reply_to) fprintf(f, "Reply-To: %s\n", errors_reply_to); moan_write_from(f); fprintf(f, "Auto-Submitted: auto-generated\n" "To: %s\n" "Subject: Delivery Status Notification\n" "Content-Type: multipart/report; report-type=delivery-status; boundary=%s\n" "MIME-Version: 1.0\n\n" "--%s\n" "Content-type: text/plain; charset=us-ascii\n\n" "This message was created automatically by mail delivery software.\n" " ----- The following addresses had successful delivery notifications -----\n", sender_address, bound, bound); for (address_item * a = addr_senddsn; a; a = a->next) fprintf(f, "<%s> (relayed %s)\n\n", a->address, a->dsn_flags & rf_dsnlasthop ? "via non DSN router" : a->dsn_aware == dsn_support_no ? "to non-DSN-aware mailer" : "via non \"Remote SMTP\" router" ); fprintf(f, "--%s\n" "Content-type: message/delivery-status\n\n" "Reporting-MTA: dns; %s\n", bound, smtp_active_hostname); if (dsn_envid) { /* must be decoded from xtext: see RFC 3461:6.3a */ uschar *xdec_envid; if (auth_xtextdecode(dsn_envid, &xdec_envid) > 0) fprintf(f, "Original-Envelope-ID: %s\n", dsn_envid); else fprintf(f, "X-Original-Envelope-ID: error decoding xtext formatted ENVID\n"); } fputc('\n', f); for (address_item * a = addr_senddsn; a; a = a->next) { host_item * hu; print_dsn_addr_action(f, a, US"delivered", US"2.0.0"); if ((hu = a->host_used) && hu->name) fprintf(f, "Remote-MTA: dns; %s\nDiagnostic-Code: smtp; 250 Ok\n\n", hu->name); else fprintf(f, "Diagnostic-Code: X-Exim; relayed via non %s router\n\n", a->dsn_flags & rf_dsnlasthop ? "DSN" : "SMTP"); } fprintf(f, "--%s\nContent-type: text/rfc822-headers\n\n", bound); fflush(f); transport_filter_argv = NULL; /* Just in case */ return_path = sender_address; /* In case not previously set */ /* Write the original email out */ tctx.u.fd = fd; tctx.options = topt_add_return_path | topt_no_body; /*XXX hmm, FALSE(fail) retval ignored. Could error for any number of reasons, and they are not handled. */ transport_write_message(&tctx, 0); fflush(f); fprintf(f,"\n--%s--\n", bound); fflush(f); fclose(f); rc = child_close(pid, 0); /* Waits for child to close, no timeout */ } } /* If any addresses failed, we must send a message to somebody, unless af_ignore_error is set, in which case no action is taken. It is possible for several messages to get sent if there are addresses with different requirements. */ while (addr_failed) { pid_t pid; int fd; uschar *logtod = tod_stamp(tod_log); address_item *addr; address_item *handled_addr = NULL; address_item **paddr; address_item *msgchain = NULL; address_item **pmsgchain = &msgchain; /* There are weird cases when logging is disabled in the transport. However, there may not be a transport (address failed by a router). */ f.disable_logging = FALSE; if (addr_failed->transport) f.disable_logging = addr_failed->transport->disable_logging; DEBUG(D_deliver) debug_printf("processing failed address %s\n", addr_failed->address); /* There are only two ways an address in a bounce message can get here: (1) When delivery was initially deferred, but has now timed out (in the call to retry_update() above). We can detect this by testing for af_retry_timedout. If the address does not have its own errors address, we arrange to ignore the error. (2) If delivery failures for bounce messages are being ignored. We can detect this by testing for af_ignore_error. This will also be set if a bounce message has been autothawed and the ignore_bounce_errors_after time has passed. It might also be set if a router was explicitly configured to ignore errors (errors_to = ""). If neither of these cases obtains, something has gone wrong. Log the incident, but then ignore the error. */ if (sender_address[0] == 0 && !addr_failed->prop.errors_address) { if ( !testflag(addr_failed, af_retry_timedout) && !addr_failed->prop.ignore_error) log_write(0, LOG_MAIN|LOG_PANIC, "internal error: bounce message " "failure is neither frozen nor ignored (it's been ignored)"); addr_failed->prop.ignore_error = TRUE; } /* If the first address on the list has af_ignore_error set, just remove it from the list, throw away any saved message file, log it, and mark the recipient done. */ if ( addr_failed->prop.ignore_error || addr_failed->dsn_flags & rf_dsnflags && !(addr_failed->dsn_flags & rf_notify_failure) ) { addr = addr_failed; addr_failed = addr->next; if (addr->return_filename) Uunlink(addr->return_filename); #ifndef DISABLE_EVENT msg_event_raise(US"msg:fail:delivery", addr); #endif log_write(0, LOG_MAIN, "%s%s%s%s: error ignored%s", addr->address, !addr->parent ? US"" : US" <", !addr->parent ? US"" : addr->parent->address, !addr->parent ? US"" : US">", addr->prop.ignore_error ? US"" : US": RFC 3461 DSN, failure notify not requested"); address_done(addr, logtod); child_done(addr, logtod); /* Panic-dies on error */ (void)spool_write_header(message_id, SW_DELIVERING, NULL); } /* Otherwise, handle the sending of a message. Find the error address for the first address, then send a message that includes all failed addresses that have the same error address. Note the bounce_recipient is a global so that it can be accessed by $bounce_recipient while creating a customized error message. */ else { if (!(bounce_recipient = addr_failed->prop.errors_address)) bounce_recipient = sender_address; /* Make a subprocess to send a message */ if ((pid = child_open_exim(&fd)) < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Process %d (parent %d) failed to " "create child process to send failure message: %s", getpid(), getppid(), strerror(errno)); /* Creation of child succeeded */ else { int ch, rc; int filecount = 0; int rcount = 0; uschar *bcc, *emf_text; FILE * fp = fdopen(fd, "wb"); FILE * emf = NULL; BOOL to_sender = strcmpic(sender_address, bounce_recipient) == 0; int max = (bounce_return_size_limit/DELIVER_IN_BUFFER_SIZE + 1) * DELIVER_IN_BUFFER_SIZE; uschar * bound; uschar *dsnlimitmsg; uschar *dsnnotifyhdr; int topt; DEBUG(D_deliver) debug_printf("sending error message to: %s\n", bounce_recipient); /* Scan the addresses for all that have the same errors address, removing them from the addr_failed chain, and putting them on msgchain. */ paddr = &addr_failed; for (addr = addr_failed; addr; addr = *paddr) if (Ustrcmp(bounce_recipient, addr->prop.errors_address ? addr->prop.errors_address : sender_address) == 0) { /* The same - dechain */ *paddr = addr->next; *pmsgchain = addr; addr->next = NULL; pmsgchain = &(addr->next); } else paddr = &addr->next; /* Not the same; skip */ /* Include X-Failed-Recipients: for automatic interpretation, but do not let any one header line get too long. We do this by starting a new header every 50 recipients. Omit any addresses for which the "hide_child" flag is set. */ for (addr = msgchain; addr; addr = addr->next) { if (testflag(addr, af_hide_child)) continue; if (rcount >= 50) { fprintf(fp, "\n"); rcount = 0; } fprintf(fp, "%s%s", rcount++ == 0 ? "X-Failed-Recipients: " : ",\n ", testflag(addr, af_pfr) && addr->parent ? string_printing(addr->parent->address) : string_printing(addr->address)); } if (rcount > 0) fprintf(fp, "\n"); /* Output the standard headers */ if (errors_reply_to) fprintf(fp, "Reply-To: %s\n", errors_reply_to); fprintf(fp, "Auto-Submitted: auto-replied\n"); moan_write_from(fp); fprintf(fp, "To: %s\n", bounce_recipient); /* generate boundary string and output MIME-Headers */ bound = string_sprintf(TIME_T_FMT "-eximdsn-%d", time(NULL), rand()); fprintf(fp, "Content-Type: multipart/report;" " report-type=delivery-status; boundary=%s\n" "MIME-Version: 1.0\n", bound); /* Open a template file if one is provided. Log failure to open, but carry on - default texts will be used. */ if (bounce_message_file) if (!(emf = Ufopen(bounce_message_file, "rb"))) log_write(0, LOG_MAIN|LOG_PANIC, "Failed to open %s for error " "message texts: %s", bounce_message_file, strerror(errno)); /* Quietly copy to configured additional addresses if required. */ if ((bcc = moan_check_errorcopy(bounce_recipient))) fprintf(fp, "Bcc: %s\n", bcc); /* The texts for the message can be read from a template file; if there isn't one, or if it is too short, built-in texts are used. The first emf text is a Subject: and any other headers. */ if ((emf_text = next_emf(emf, US"header"))) fprintf(fp, "%s\n", emf_text); else fprintf(fp, "Subject: Mail delivery failed%s\n\n", to_sender? ": returning message to sender" : ""); /* output human readable part as text/plain section */ fprintf(fp, "--%s\n" "Content-type: text/plain; charset=us-ascii\n\n", bound); if ((emf_text = next_emf(emf, US"intro"))) fprintf(fp, "%s", CS emf_text); else { fprintf(fp, /* This message has been reworded several times. It seems to be confusing to somebody, however it is worded. I have retreated to the original, simple wording. */ "This message was created automatically by mail delivery software.\n"); if (bounce_message_text) fprintf(fp, "%s", CS bounce_message_text); if (to_sender) fprintf(fp, "\nA message that you sent could not be delivered to one or more of its\n" "recipients. This is a permanent error. The following address(es) failed:\n"); else fprintf(fp, "\nA message sent by\n\n <%s>\n\n" "could not be delivered to one or more of its recipients. The following\n" "address(es) failed:\n", sender_address); } fputc('\n', fp); /* Process the addresses, leaving them on the msgchain if they have a file name for a return message. (There has already been a check in post_process_one() for the existence of data in the message file.) A TRUE return from print_address_information() means that the address is not hidden. */ paddr = &msgchain; for (addr = msgchain; addr; addr = *paddr) { if (print_address_information(addr, fp, US" ", US"\n ", US"")) print_address_error(addr, fp, US""); /* End the final line for the address */ fputc('\n', fp); /* Leave on msgchain if there's a return file. */ if (addr->return_file >= 0) { paddr = &(addr->next); filecount++; } /* Else save so that we can tick off the recipient when the message is sent. */ else { *paddr = addr->next; addr->next = handled_addr; handled_addr = addr; } } fputc('\n', fp); /* Get the next text, whether we need it or not, so as to be positioned for the one after. */ emf_text = next_emf(emf, US"generated text"); /* If there were any file messages passed by the local transports, include them in the message. Then put the address on the handled chain. In the case of a batch of addresses that were all sent to the same transport, the return_file field in all of them will contain the same fd, and the return_filename field in the *last* one will be set (to the name of the file). */ if (msgchain) { address_item *nextaddr; if (emf_text) fprintf(fp, "%s", CS emf_text); else fprintf(fp, "The following text was generated during the delivery " "attempt%s:\n", (filecount > 1)? "s" : ""); for (addr = msgchain; addr; addr = nextaddr) { FILE *fm; address_item *topaddr = addr; /* List all the addresses that relate to this file */ fputc('\n', fp); while(addr) /* Insurance */ { print_address_information(addr, fp, US"------ ", US"\n ", US" ------\n"); if (addr->return_filename) break; addr = addr->next; } fputc('\n', fp); /* Now copy the file */ if (!(fm = Ufopen(addr->return_filename, "rb"))) fprintf(fp, " +++ Exim error... failed to open text file: %s\n", strerror(errno)); else { while ((ch = fgetc(fm)) != EOF) fputc(ch, fp); (void)fclose(fm); } Uunlink(addr->return_filename); /* Can now add to handled chain, first fishing off the next address on the msgchain. */ nextaddr = addr->next; addr->next = handled_addr; handled_addr = topaddr; } fputc('\n', fp); } /* output machine readable part */ #ifdef SUPPORT_I18N if (message_smtputf8) fprintf(fp, "--%s\n" "Content-type: message/global-delivery-status\n\n" "Reporting-MTA: dns; %s\n", bound, smtp_active_hostname); else #endif fprintf(fp, "--%s\n" "Content-type: message/delivery-status\n\n" "Reporting-MTA: dns; %s\n", bound, smtp_active_hostname); if (dsn_envid) { /* must be decoded from xtext: see RFC 3461:6.3a */ uschar *xdec_envid; if (auth_xtextdecode(dsn_envid, &xdec_envid) > 0) fprintf(fp, "Original-Envelope-ID: %s\n", dsn_envid); else fprintf(fp, "X-Original-Envelope-ID: error decoding xtext formatted ENVID\n"); } fputc('\n', fp); for (addr = handled_addr; addr; addr = addr->next) { host_item * hu; print_dsn_addr_action(fp, addr, US"failed", US"5.0.0"); if ((hu = addr->host_used) && hu->name) { fprintf(fp, "Remote-MTA: dns; %s\n", hu->name); #ifdef EXPERIMENTAL_DSN_INFO { const uschar * s; if (hu->address) { uschar * p = hu->port == 25 ? US"" : string_sprintf(":%d", hu->port); fprintf(fp, "Remote-MTA: X-ip; [%s]%s\n", hu->address, p); } if ((s = addr->smtp_greeting) && *s) fprintf(fp, "X-Remote-MTA-smtp-greeting: X-str; %s\n", s); if ((s = addr->helo_response) && *s) fprintf(fp, "X-Remote-MTA-helo-response: X-str; %s\n", s); if ((s = addr->message) && *s) fprintf(fp, "X-Exim-Diagnostic: X-str; %s\n", s); } #endif print_dsn_diagnostic_code(addr, fp); } fputc('\n', fp); } /* Now copy the message, trying to give an intelligible comment if it is too long for it all to be copied. The limit isn't strictly applied because of the buffering. There is, however, an option to suppress copying altogether. */ emf_text = next_emf(emf, US"copy"); /* add message body we ignore the intro text from template and add the text for bounce_return_size_limit at the end. bounce_return_message is ignored in case RET= is defined we honor these values otherwise bounce_return_body is honored. bounce_return_size_limit is always honored. */ fprintf(fp, "--%s\n", bound); dsnlimitmsg = US"X-Exim-DSN-Information: Due to administrative limits only headers are returned"; dsnnotifyhdr = NULL; topt = topt_add_return_path; /* RET=HDRS? top priority */ if (dsn_ret == dsn_ret_hdrs) topt |= topt_no_body; else { struct stat statbuf; /* no full body return at all? */ if (!bounce_return_body) { topt |= topt_no_body; /* add header if we overrule RET=FULL */ if (dsn_ret == dsn_ret_full) dsnnotifyhdr = dsnlimitmsg; } /* line length limited... return headers only if oversize */ /* size limited ... return headers only if limit reached */ else if ( max_received_linelength > bounce_return_linesize_limit || ( bounce_return_size_limit > 0 && fstat(deliver_datafile, &statbuf) == 0 && statbuf.st_size > max ) ) { topt |= topt_no_body; dsnnotifyhdr = dsnlimitmsg; } } #ifdef SUPPORT_I18N if (message_smtputf8) fputs(topt & topt_no_body ? "Content-type: message/global-headers\n\n" : "Content-type: message/global\n\n", fp); else #endif fputs(topt & topt_no_body ? "Content-type: text/rfc822-headers\n\n" : "Content-type: message/rfc822\n\n", fp); fflush(fp); transport_filter_argv = NULL; /* Just in case */ return_path = sender_address; /* In case not previously set */ { /* Dummy transport for headers add */ transport_ctx tctx = {{0}}; transport_instance tb = {0}; tctx.u.fd = fileno(fp); tctx.tblock = &tb; tctx.options = topt; tb.add_headers = dsnnotifyhdr; /*XXX no checking for failure! buggy! */ transport_write_message(&tctx, 0); } fflush(fp); /* we never add the final text. close the file */ if (emf) (void)fclose(emf); fprintf(fp, "\n--%s--\n", bound); /* Close the file, which should send an EOF to the child process that is receiving the message. Wait for it to finish. */ (void)fclose(fp); rc = child_close(pid, 0); /* Waits for child to close, no timeout */ /* In the test harness, let the child do it's thing first. */ if (f.running_in_test_harness) millisleep(500); /* If the process failed, there was some disaster in setting up the error message. Unless the message is very old, ensure that addr_defer is non-null, which will have the effect of leaving the message on the spool. The failed addresses will get tried again next time. However, we don't really want this to happen too often, so freeze the message unless there are some genuine deferred addresses to try. To do this we have to call spool_write_header() here, because with no genuine deferred addresses the normal code below doesn't get run. */ if (rc != 0) { uschar *s = US""; if (now - received_time.tv_sec < retry_maximum_timeout && !addr_defer) { addr_defer = (address_item *)(+1); f.deliver_freeze = TRUE; deliver_frozen_at = time(NULL); /* Panic-dies on error */ (void)spool_write_header(message_id, SW_DELIVERING, NULL); s = US" (frozen)"; } deliver_msglog("Process failed (%d) when writing error message " "to %s%s", rc, bounce_recipient, s); log_write(0, LOG_MAIN, "Process failed (%d) when writing error message " "to %s%s", rc, bounce_recipient, s); } /* The message succeeded. Ensure that the recipients that failed are now marked finished with on the spool and their parents updated. */ else { for (addr = handled_addr; addr; addr = addr->next) { address_done(addr, logtod); child_done(addr, logtod); } /* Panic-dies on error */ (void)spool_write_header(message_id, SW_DELIVERING, NULL); } } } } f.disable_logging = FALSE; /* In case left set */ /* Come here from the mua_wrapper case if routing goes wrong */ DELIVERY_TIDYUP: /* If there are now no deferred addresses, we are done. Preserve the message log if so configured, and we are using them. Otherwise, sling it. Then delete the message itself. */ if (!addr_defer) { uschar * fname; if (message_logs) { fname = spool_fname(US"msglog", message_subdir, id, US""); if (preserve_message_logs) { int rc; uschar * moname = spool_fname(US"msglog.OLD", US"", id, US""); if ((rc = Urename(fname, moname)) < 0) { (void)directory_make(spool_directory, spool_sname(US"msglog.OLD", US""), MSGLOG_DIRECTORY_MODE, TRUE); rc = Urename(fname, moname); } if (rc < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to move %s to the " "msglog.OLD directory", fname); } else if (Uunlink(fname) < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to unlink %s: %s", fname, strerror(errno)); } /* Remove the two message files. */ fname = spool_fname(US"input", message_subdir, id, US"-D"); if (Uunlink(fname) < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to unlink %s: %s", fname, strerror(errno)); fname = spool_fname(US"input", message_subdir, id, US"-H"); if (Uunlink(fname) < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to unlink %s: %s", fname, strerror(errno)); /* Log the end of this message, with queue time if requested. */ if (LOGGING(queue_time_overall)) log_write(0, LOG_MAIN, "Completed QT=%s", string_timesince(&received_time)); else log_write(0, LOG_MAIN, "Completed"); /* Unset deliver_freeze so that we won't try to move the spool files further down */ f.deliver_freeze = FALSE; #ifndef DISABLE_EVENT (void) event_raise(event_action, US"msg:complete", NULL); #endif } /* If there are deferred addresses, we are keeping this message because it is not yet completed. Lose any temporary files that were catching output from pipes for any of the deferred addresses, handle one-time aliases, and see if the message has been on the queue for so long that it is time to send a warning message to the sender, unless it is a mailer-daemon. If all deferred addresses have the same domain, we can set deliver_domain for the expansion of delay_warning_ condition - if any of them are pipes, files, or autoreplies, use the parent's domain. If all the deferred addresses have an error number that indicates "retry time not reached", skip sending the warning message, because it won't contain the reason for the delay. It will get sent at the next real delivery attempt. Exception: for retries caused by a remote peer we use the error message store in the retry DB as the reason. However, if at least one address has tried, we'd better include all of them in the message. If we can't make a process to send the message, don't worry. For mailing list expansions we want to send the warning message to the mailing list manager. We can't do a perfect job here, as some addresses may have different errors addresses, but if we take the errors address from each deferred address it will probably be right in most cases. If addr_defer == +1, it means there was a problem sending an error message for failed addresses, and there were no "real" deferred addresses. The value was set just to keep the message on the spool, so there is nothing to do here. */ else if (addr_defer != (address_item *)(+1)) { uschar *recipients = US""; BOOL want_warning_msg = FALSE; deliver_domain = testflag(addr_defer, af_pfr) ? addr_defer->parent->domain : addr_defer->domain; for (address_item * addr = addr_defer; addr; addr = addr->next) { address_item *otaddr; if (addr->basic_errno > ERRNO_WARN_BASE) want_warning_msg = TRUE; if (deliver_domain) { const uschar *d = testflag(addr, af_pfr) ? addr->parent->domain : addr->domain; /* The domain may be unset for an address that has never been routed because the system filter froze the message. */ if (!d || Ustrcmp(d, deliver_domain) != 0) deliver_domain = NULL; } if (addr->return_filename) Uunlink(addr->return_filename); /* Handle the case of one-time aliases. If any address in the ancestry of this one is flagged, ensure it is in the recipients list, suitably flagged, and that its parent is marked delivered. */ for (otaddr = addr; otaddr; otaddr = otaddr->parent) if (otaddr->onetime_parent) break; if (otaddr) { int i; int t = recipients_count; for (i = 0; i < recipients_count; i++) { uschar *r = recipients_list[i].address; if (Ustrcmp(otaddr->onetime_parent, r) == 0) t = i; if (Ustrcmp(otaddr->address, r) == 0) break; } /* Didn't find the address already in the list, and did find the ultimate parent's address in the list, and they really are different (i.e. not from an identity-redirect). After adding the recipient, update the errors address in the recipients list. */ if ( i >= recipients_count && t < recipients_count && Ustrcmp(otaddr->address, otaddr->parent->address) != 0) { DEBUG(D_deliver) debug_printf("one_time: adding %s in place of %s\n", otaddr->address, otaddr->parent->address); receive_add_recipient(otaddr->address, t); recipients_list[recipients_count-1].errors_to = otaddr->prop.errors_address; tree_add_nonrecipient(otaddr->parent->address); update_spool = TRUE; } } /* Except for error messages, ensure that either the errors address for this deferred address or, if there is none, the sender address, is on the list of recipients for a warning message. */ if (sender_address[0]) { uschar * s = addr->prop.errors_address; if (!s) s = sender_address; if (Ustrstr(recipients, s) == NULL) recipients = string_sprintf("%s%s%s", recipients, recipients[0] ? "," : "", s); } } /* Send a warning message if the conditions are right. If the condition check fails because of a lookup defer, there is nothing we can do. The warning is not sent. Another attempt will be made at the next delivery attempt (if it also defers). */ if ( !f.queue_2stage && want_warning_msg && ( !(addr_defer->dsn_flags & rf_dsnflags) || addr_defer->dsn_flags & rf_notify_delay ) && delay_warning[1] > 0 && sender_address[0] != 0 && ( !delay_warning_condition || expand_check_condition(delay_warning_condition, US"delay_warning", US"option") ) ) { int count; int show_time; int queue_time = time(NULL) - received_time.tv_sec; /* When running in the test harness, there's an option that allows us to fudge this time so as to get repeatability of the tests. Take the first time off the list. In queue runs, the list pointer gets updated in the calling process. */ if (f.running_in_test_harness && fudged_queue_times[0] != 0) { int qt = readconf_readtime(fudged_queue_times, '/', FALSE); if (qt >= 0) { DEBUG(D_deliver) debug_printf("fudged queue_times = %s\n", fudged_queue_times); queue_time = qt; } } /* See how many warnings we should have sent by now */ for (count = 0; count < delay_warning[1]; count++) if (queue_time < delay_warning[count+2]) break; show_time = delay_warning[count+1]; if (count >= delay_warning[1]) { int extra; int last_gap = show_time; if (count > 1) last_gap -= delay_warning[count]; extra = (queue_time - delay_warning[count+1])/last_gap; show_time += last_gap * extra; count += extra; } DEBUG(D_deliver) { debug_printf("time on queue = %s id %s addr %s\n", readconf_printtime(queue_time), message_id, addr_defer->address); debug_printf("warning counts: required %d done %d\n", count, warning_count); } /* We have computed the number of warnings there should have been by now. If there haven't been enough, send one, and up the count to what it should have been. */ if (warning_count < count) { header_line *h; int fd; pid_t pid = child_open_exim(&fd); if (pid > 0) { uschar *wmf_text; FILE *wmf = NULL; FILE *f = fdopen(fd, "wb"); uschar * bound; transport_ctx tctx = {{0}}; if (warn_message_file) if (!(wmf = Ufopen(warn_message_file, "rb"))) log_write(0, LOG_MAIN|LOG_PANIC, "Failed to open %s for warning " "message texts: %s", warn_message_file, strerror(errno)); warnmsg_recipients = recipients; warnmsg_delay = queue_time < 120*60 ? string_sprintf("%d minutes", show_time/60) : string_sprintf("%d hours", show_time/3600); if (errors_reply_to) fprintf(f, "Reply-To: %s\n", errors_reply_to); fprintf(f, "Auto-Submitted: auto-replied\n"); moan_write_from(f); fprintf(f, "To: %s\n", recipients); /* generated boundary string and output MIME-Headers */ bound = string_sprintf(TIME_T_FMT "-eximdsn-%d", time(NULL), rand()); fprintf(f, "Content-Type: multipart/report;" " report-type=delivery-status; boundary=%s\n" "MIME-Version: 1.0\n", bound); if ((wmf_text = next_emf(wmf, US"header"))) fprintf(f, "%s\n", wmf_text); else fprintf(f, "Subject: Warning: message %s delayed %s\n\n", message_id, warnmsg_delay); /* output human readable part as text/plain section */ fprintf(f, "--%s\n" "Content-type: text/plain; charset=us-ascii\n\n", bound); if ((wmf_text = next_emf(wmf, US"intro"))) fprintf(f, "%s", CS wmf_text); else { fprintf(f, "This message was created automatically by mail delivery software.\n"); if (Ustrcmp(recipients, sender_address) == 0) fprintf(f, "A message that you sent has not yet been delivered to one or more of its\n" "recipients after more than "); else fprintf(f, "A message sent by\n\n <%s>\n\n" "has not yet been delivered to one or more of its recipients after more than \n", sender_address); fprintf(f, "%s on the queue on %s.\n\n" "The message identifier is: %s\n", warnmsg_delay, primary_hostname, message_id); for (h = header_list; h; h = h->next) if (strncmpic(h->text, US"Subject:", 8) == 0) fprintf(f, "The subject of the message is: %s", h->text + 9); else if (strncmpic(h->text, US"Date:", 5) == 0) fprintf(f, "The date of the message is: %s", h->text + 6); fputc('\n', f); fprintf(f, "The address%s to which the message has not yet been " "delivered %s:\n", !addr_defer->next ? "" : "es", !addr_defer->next ? "is": "are"); } /* List the addresses, with error information if allowed */ fputc('\n', f); for (address_item * addr = addr_defer; addr; addr = addr->next) { if (print_address_information(addr, f, US" ", US"\n ", US"")) print_address_error(addr, f, US"Delay reason: "); fputc('\n', f); } fputc('\n', f); /* Final text */ if (wmf) { if ((wmf_text = next_emf(wmf, US"final"))) fprintf(f, "%s", CS wmf_text); (void)fclose(wmf); } else { fprintf(f, "No action is required on your part. Delivery attempts will continue for\n" "some time, and this warning may be repeated at intervals if the message\n" "remains undelivered. Eventually the mail delivery software will give up,\n" "and when that happens, the message will be returned to you.\n"); } /* output machine readable part */ fprintf(f, "\n--%s\n" "Content-type: message/delivery-status\n\n" "Reporting-MTA: dns; %s\n", bound, smtp_active_hostname); if (dsn_envid) { /* must be decoded from xtext: see RFC 3461:6.3a */ uschar *xdec_envid; if (auth_xtextdecode(dsn_envid, &xdec_envid) > 0) fprintf(f,"Original-Envelope-ID: %s\n", dsn_envid); else fprintf(f,"X-Original-Envelope-ID: error decoding xtext formatted ENVID\n"); } fputc('\n', f); for (address_item * addr = addr_defer; addr; addr = addr->next) { host_item * hu; print_dsn_addr_action(f, addr, US"delayed", US"4.0.0"); if ((hu = addr->host_used) && hu->name) { fprintf(f, "Remote-MTA: dns; %s\n", hu->name); print_dsn_diagnostic_code(addr, f); } fputc('\n', f); } fprintf(f, "--%s\n" "Content-type: text/rfc822-headers\n\n", bound); fflush(f); /* header only as required by RFC. only failure DSN needs to honor RET=FULL */ tctx.u.fd = fileno(f); tctx.options = topt_add_return_path | topt_no_body; transport_filter_argv = NULL; /* Just in case */ return_path = sender_address; /* In case not previously set */ /* Write the original email out */ /*XXX no checking for failure! buggy! */ transport_write_message(&tctx, 0); fflush(f); fprintf(f,"\n--%s--\n", bound); fflush(f); /* Close and wait for child process to complete, without a timeout. If there's an error, don't update the count. */ (void)fclose(f); if (child_close(pid, 0) == 0) { warning_count = count; update_spool = TRUE; /* Ensure spool rewritten */ } } } } /* Clear deliver_domain */ deliver_domain = NULL; /* If this was a first delivery attempt, unset the first time flag, and ensure that the spool gets updated. */ if (f.deliver_firsttime) { f.deliver_firsttime = FALSE; update_spool = TRUE; } /* If delivery was frozen and freeze_tell is set, generate an appropriate message, unless the message is a local error message (to avoid loops). Then log the freezing. If the text in "frozen_info" came from a system filter, it has been escaped into printing characters so as not to mess up log lines. For the "tell" message, we turn \n back into newline. Also, insert a newline near the start instead of the ": " string. */ if (f.deliver_freeze) { if (freeze_tell && freeze_tell[0] != 0 && !f.local_error_message) { uschar *s = string_copy(frozen_info); uschar *ss = Ustrstr(s, " by the system filter: "); if (ss != NULL) { ss[21] = '.'; ss[22] = '\n'; } ss = s; while (*ss != 0) { if (*ss == '\\' && ss[1] == 'n') { *ss++ = ' '; *ss++ = '\n'; } else ss++; } moan_tell_someone(freeze_tell, addr_defer, US"Message frozen", "Message %s has been frozen%s.\nThe sender is <%s>.\n", message_id, s, sender_address); } /* Log freezing just before we update the -H file, to minimize the chance of a race problem. */ deliver_msglog("*** Frozen%s\n", frozen_info); log_write(0, LOG_MAIN, "Frozen%s", frozen_info); } /* If there have been any updates to the non-recipients list, or other things that get written to the spool, we must now update the spool header file so that it has the right information for the next delivery attempt. If there was more than one address being delivered, the header_change update is done earlier, in case one succeeds and then something crashes. */ DEBUG(D_deliver) debug_printf("delivery deferred: update_spool=%d header_rewritten=%d\n", update_spool, f.header_rewritten); if (update_spool || f.header_rewritten) /* Panic-dies on error */ (void)spool_write_header(message_id, SW_DELIVERING, NULL); } /* Finished with the message log. If the message is complete, it will have been unlinked or renamed above. */ if (message_logs) (void)fclose(message_log); /* Now we can close and remove the journal file. Its only purpose is to record successfully completed deliveries asap so that this information doesn't get lost if Exim (or the machine) crashes. Forgetting about a failed delivery is not serious, as trying it again is not harmful. The journal might not be open if all addresses were deferred at routing or directing. Nevertheless, we must remove it if it exists (may have been lying around from a crash during the previous delivery attempt). We don't remove the journal if a delivery subprocess failed to pass back delivery information; this is controlled by the remove_journal flag. When the journal is left, we also don't move the message off the main spool if frozen and the option is set. It should get moved at the next attempt, after the journal has been inspected. */ if (journal_fd >= 0) (void)close(journal_fd); if (remove_journal) { uschar * fname = spool_fname(US"input", message_subdir, id, US"-J"); if (Uunlink(fname) < 0 && errno != ENOENT) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to unlink %s: %s", fname, strerror(errno)); /* Move the message off the spool if requested */ #ifdef SUPPORT_MOVE_FROZEN_MESSAGES if (f.deliver_freeze && move_frozen_messages) (void)spool_move_message(id, message_subdir, US"", US"F"); #endif } /* Closing the data file frees the lock; if the file has been unlinked it will go away. Otherwise the message becomes available for another process to try delivery. */ (void)close(deliver_datafile); deliver_datafile = -1; DEBUG(D_deliver) debug_printf("end delivery of %s\n", id); /* It is unlikely that there will be any cached resources, since they are released after routing, and in the delivery subprocesses. However, it's possible for an expansion for something afterwards (for example, expand_check_condition) to do a lookup. We must therefore be sure everything is released. */ search_tidyup(); acl_where = ACL_WHERE_UNKNOWN; return final_yield; } void deliver_init(void) { #ifdef EXIM_TFO_PROBE tfo_probe(); #else f.tcp_fastopen_ok = TRUE; #endif if (!regex_PIPELINING) regex_PIPELINING = regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE); if (!regex_SIZE) regex_SIZE = regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE); if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE); #ifndef DISABLE_TLS if (!regex_STARTTLS) regex_STARTTLS = regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE); #endif if (!regex_CHUNKING) regex_CHUNKING = regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE); #ifndef DISABLE_PRDR if (!regex_PRDR) regex_PRDR = regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE); #endif #ifdef SUPPORT_I18N if (!regex_UTF8) regex_UTF8 = regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE); #endif if (!regex_DSN) regex_DSN = regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE); if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA = regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE); #ifdef SUPPORT_PIPE_CONNECT if (!regex_EARLY_PIPE) regex_EARLY_PIPE = regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE); #endif } uschar * deliver_get_sender_address (uschar * id) { int rc; uschar * new_sender_address, * save_sender_address; BOOL save_qr = f.queue_running; uschar * spoolname; /* make spool_open_datafile non-noisy on fail */ f.queue_running = TRUE; /* Side effect: message_subdir is set for the (possibly split) spool directory */ deliver_datafile = spool_open_datafile(id); f.queue_running = save_qr; if (deliver_datafile < 0) return NULL; /* Save and restore the global sender_address. I'm not sure if we should not save/restore all the other global variables too, because spool_read_header() may change all of them. But OTOH, when this deliver_get_sender_address() gets called, the current message is done already and nobody needs the globals anymore. (HS12, 2015-08-21) */ spoolname = string_sprintf("%s-H", id); save_sender_address = sender_address; rc = spool_read_header(spoolname, TRUE, TRUE); new_sender_address = sender_address; sender_address = save_sender_address; if (rc != spool_read_OK) return NULL; assert(new_sender_address); (void)close(deliver_datafile); deliver_datafile = -1; return new_sender_address; } void delivery_re_exec(int exec_type) { uschar * where; if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only) { int channel_fd = cutthrough.cctx.sock; smtp_peer_options = cutthrough.peer_options; continue_sequence = 0; #ifndef DISABLE_TLS if (cutthrough.is_tls) { int pfd[2], pid; smtp_peer_options |= OPTION_TLS; sending_ip_address = cutthrough.snd_ip; sending_port = cutthrough.snd_port; where = US"socketpair"; if (socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) != 0) goto fail; where = US"fork"; if ((pid = fork()) < 0) goto fail; else if (pid == 0) /* child: fork again to totally disconnect */ { if (f.running_in_test_harness) millisleep(100); /* let parent debug out */ /* does not return */ smtp_proxy_tls(cutthrough.cctx.tls_ctx, big_buffer, big_buffer_size, pfd, 5*60); } DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid); close(pfd[0]); waitpid(pid, NULL, 0); (void) close(channel_fd); /* release the client socket */ channel_fd = pfd[1]; } #endif transport_do_pass_socket(cutthrough.transport, cutthrough.host.name, cutthrough.host.address, message_id, channel_fd); } else { cancel_cutthrough_connection(TRUE, US"non-continued delivery"); (void) child_exec_exim(exec_type, FALSE, NULL, FALSE, 2, US"-Mc", message_id); } return; /* compiler quietening; control does not reach here. */ #ifndef DISABLE_TLS fail: log_write(0, LOG_MAIN | (exec_type == CEE_EXEC_EXIT ? LOG_PANIC : LOG_PANIC_DIE), "delivery re-exec %s failed: %s", where, strerror(errno)); /* Get here if exec_type == CEE_EXEC_EXIT. Note: this must be _exit(), not exit(). */ _exit(EX_EXECFAILED); #endif } /* vi: aw ai sw=2 */ /* End of deliver.c */