-/* $Cambridge: exim/src/src/routers/rf_lookup_hostlist.c,v 1.1 2004/10/07 13:10:02 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2004 */
+/* Copyright (c) University of Cambridge 1995 - 2015 */
/* See the file NOTICE for conditions of use and distribution. */
replaces the incoming "host". In other words, "x/MX" is shorthand for "those
hosts pointed to by x's MX records".
+It is also possible for a port to be specified along with the host name or IP
+address. The syntax is to add ":port" on to the end. This doesn't work with
+IPv6 addresses, so we allow IP addresses to be enclosed in [] in order to make
+this work. The specification of the port must come last, that is, after "/MX"
+if that is present.
+
Arguments:
rblock the router block
addr the address being routed
ignore_target_hosts list of hosts to ignore
- lookup_type lk_default or lk_byname or lk_bydns
+ lookup_type LK_DEFAULT or LK_BYNAME or LK_BYDNS,
+ plus LK_IPV4_{ONLY,PREFER}
hff_code what to do for host find failed
addr_new passed to rf_self_action for self=reroute
address_item **addr_new)
{
BOOL self_send = FALSE;
-host_item *h, *next_h, *prev;
/* Look up each host address. A lookup may add additional items into the chain
if there are multiple addresses. Hence the use of next_h to start each cycle of
list of MX hosts. If the first host is the local host, act according to the
"self" option in the configuration. */
-prev = NULL;
-for (h = addr->host_list; h != NULL; prev = h, h = next_h)
+for (host_item * prev = NULL, * h = addr->host_list, *next_h; h; h = next_h)
{
- uschar *canonical_name;
- int rc, len;
+ const uschar *canonical_name;
+ int rc, len, port, mx, sort_key;
next_h = h->next;
- if (h->address != NULL) continue;
+ if (h->address) { prev = h; continue; }
DEBUG(D_route|D_host_lookup)
debug_printf("finding IP address for %s\n", h->name);
+ /* Handle any port setting that may be on the name; it will be removed
+ from the end of the name. */
+
+ port = host_item_get_port(h);
+
+ /* Store the previous mx and sort_key values, which were assigned in
+ host_build_hostlist and will be overwritten by host_find_bydns. */
+
+ mx = h->mx;
+ sort_key = h->sort_key;
+
/* If the name ends with "/MX", we interpret it to mean "the list of hosts
- pointed to by MX records with this name". */
+ pointed to by MX records with this name", and the MX record values override
+ the ordering from host_build_hostlist. */
len = Ustrlen(h->name);
if (len > 3 && strcmpic(h->name + len - 3, US"/mx") == 0)
{
+ int whichrrs = lookup_type & LK_IPV4_ONLY
+ ? HOST_FIND_BY_MX | HOST_FIND_IPV4_ONLY
+ : lookup_type & LK_IPV4_PREFER
+ ? HOST_FIND_BY_MX | HOST_FIND_IPV4_FIRST
+ : HOST_FIND_BY_MX;
+
DEBUG(D_route|D_host_lookup)
debug_printf("doing DNS MX lookup for %s\n", h->name);
- h->name[len-3] = 0;
+ mx = MX_NONE;
+ h->name = string_copyn(h->name, len - 3);
rc = host_find_bydns(h,
ignore_target_hosts,
- HOST_FIND_BY_MX, /* look only for MX records */
- NULL, /* SRV service not relevant */
- NULL, /* failing srv domains not relevant */
- NULL, /* no special mx failing domains */
- NULL, /* fully_qualified_name */
- NULL); /* indicate local host removed */
+ whichrrs, /* look only for MX records */
+ NULL, /* SRV service not relevant */
+ NULL, /* failing srv domains not relevant */
+ NULL, /* no special mx failing domains */
+ &rblock->dnssec, /* dnssec request/require */
+ NULL, /* fully_qualified_name */
+ NULL); /* indicate local host removed */
}
/* If explicitly configured to look up by name, or if the "host name" is
actually an IP address, do a byname lookup. */
- else if (lookup_type == lk_byname || string_is_ip_address(h->name, NULL))
+ else if (lookup_type & LK_BYNAME || string_is_ip_address(h->name, NULL) != 0)
{
DEBUG(D_route|D_host_lookup) debug_printf("calling host_find_byname\n");
- rc = host_find_byname(h, ignore_target_hosts, &canonical_name, TRUE);
+ rc = host_find_byname(h, ignore_target_hosts, HOST_FIND_QUALIFY_SINGLE,
+ &canonical_name, TRUE);
}
/* Otherwise, do a DNS lookup. If that yields "host not found", and the
else
{
BOOL removed;
+ int whichrrs = lookup_type & LK_IPV4_ONLY
+ ? HOST_FIND_BY_A
+ : lookup_type & LK_IPV4_PREFER
+ ? HOST_FIND_BY_A | HOST_FIND_BY_AAAA | HOST_FIND_IPV4_FIRST
+ : HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
+
DEBUG(D_route|D_host_lookup) debug_printf("doing DNS lookup\n");
- rc = host_find_bydns(h, ignore_target_hosts, HOST_FIND_BY_A, NULL, NULL,
- NULL, &canonical_name, &removed);
- if (rc == HOST_FOUND)
- {
- if (removed) setflag(addr, af_local_host_removed);
- }
- else if (rc == HOST_FIND_FAILED)
+ switch (rc = host_find_bydns(h, ignore_target_hosts, whichrrs, NULL,
+ NULL, NULL,
+ &rblock->dnssec, /* domains for request/require */
+ &canonical_name, &removed))
{
- if (lookup_type == lk_default)
- {
- DEBUG(D_route|D_host_lookup)
- debug_printf("DNS lookup failed: trying getipnodebyname\n");
- rc = host_find_byname(h, ignore_target_hosts, &canonical_name, TRUE);
- }
+ case HOST_FOUND:
+ if (removed) setflag(addr, af_local_host_removed);
+ break;
+ case HOST_FIND_FAILED:
+ if (lookup_type & LK_DEFAULT)
+ {
+ DEBUG(D_route|D_host_lookup)
+ debug_printf("DNS lookup failed: trying %s\n",
+ f.running_in_test_harness
+ ? "host_fake_gethostbyname" : "getipnodebyname");
+ rc = host_find_byname(h, ignore_target_hosts, HOST_FIND_QUALIFY_SINGLE,
+ &canonical_name, TRUE);
+ }
+ break;
}
}
/* Temporary failure defers, unless pass_on_timeout is set */
+ if (rc == HOST_FIND_SECURITY)
+ {
+ addr->message = string_sprintf("host lookup for %s done insecurely" , h->name);
+ addr->basic_errno = ERRNO_DNSDEFER;
+ return DEFER;
+ }
if (rc == HOST_FIND_AGAIN)
{
if (rblock->pass_on_timeout)
if (rc == HOST_FIND_FAILED)
{
+ if (hff_code == hff_ignore)
+ {
+ if (prev == NULL) addr->host_list = next_h; else prev->next = next_h;
+ continue; /* With the next host, leave prev unchanged */
+ }
+
if (hff_code == hff_pass) return PASS;
if (hff_code == hff_decline) return DECLINE;
+ addr->basic_errno = ERRNO_UNKNOWNHOST;
addr->message =
string_sprintf("lookup of host \"%s\" failed in %s router%s",
h->name, rblock->name,
- host_find_failed_syntax? ": syntax error in name" : "");
+ f.host_find_failed_syntax? ": syntax error in name" : "");
if (hff_code == hff_defer) return DEFER;
if (hff_code == hff_fail) return FAIL;
return DEFER;
}
+ /* Deal with the settings that were previously cleared:
+ port, mx and sort_key. */
+
+ if (port != PORT_NONE)
+ for (host_item * hh = h; hh != next_h; hh = hh->next)
+ hh->port = port;
+
+ if (mx != MX_NONE)
+ for (host_item * hh = h; hh != next_h; hh = hh->next)
+ {
+ hh->mx = mx;
+ hh->sort_key = sort_key;
+ }
+
/* A local host gets chopped, with its successors, if there are previous
hosts. Otherwise the self option is used. If it is set to "send", any
subsequent hosts that are also the local host do NOT get chopped. */
if (rc == HOST_FOUND_LOCAL && !self_send)
{
- if (prev != NULL)
+ if (prev)
{
DEBUG(D_route)
{
debug_printf("Removed from host list:\n");
- for (; h != NULL; h = h->next) debug_printf(" %s\n", h->name);
+ for (; h; h = h->next) debug_printf(" %s\n", h->name);
}
prev->next = NULL;
setflag(addr, af_local_host_removed);
}
self_send = TRUE;
}
+
+ /* Ensure that prev is the host before next_h; this will not be h if a lookup
+ found multiple addresses or multiple MX records. */
+
+ prev = h;
+ while (prev->next != next_h) prev = prev->next;
}
return OK;
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