| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) University of Cambridge 1995 - 2012 */ |
| 6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | |
| 8 | #include "../exim.h" |
| 9 | #include "smtp.h" |
| 10 | |
| 11 | #define PENDING 256 |
| 12 | #define PENDING_DEFER (PENDING + DEFER) |
| 13 | #define PENDING_OK (PENDING + OK) |
| 14 | |
| 15 | |
| 16 | /* Options specific to the smtp transport. This transport also supports LMTP |
| 17 | over TCP/IP. The options must be in alphabetic order (note that "_" comes |
| 18 | before the lower case letters). Some live in the transport_instance block so as |
| 19 | to be publicly visible; these are flagged with opt_public. */ |
| 20 | |
| 21 | optionlist smtp_transport_options[] = { |
| 22 | { "address_retry_include_sender", opt_bool, |
| 23 | (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) }, |
| 24 | { "allow_localhost", opt_bool, |
| 25 | (void *)offsetof(smtp_transport_options_block, allow_localhost) }, |
| 26 | { "authenticated_sender", opt_stringptr, |
| 27 | (void *)offsetof(smtp_transport_options_block, authenticated_sender) }, |
| 28 | { "authenticated_sender_force", opt_bool, |
| 29 | (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) }, |
| 30 | { "command_timeout", opt_time, |
| 31 | (void *)offsetof(smtp_transport_options_block, command_timeout) }, |
| 32 | { "connect_timeout", opt_time, |
| 33 | (void *)offsetof(smtp_transport_options_block, connect_timeout) }, |
| 34 | { "connection_max_messages", opt_int | opt_public, |
| 35 | (void *)offsetof(transport_instance, connection_max_messages) }, |
| 36 | { "data_timeout", opt_time, |
| 37 | (void *)offsetof(smtp_transport_options_block, data_timeout) }, |
| 38 | { "delay_after_cutoff", opt_bool, |
| 39 | (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) }, |
| 40 | #ifndef DISABLE_DKIM |
| 41 | { "dkim_canon", opt_stringptr, |
| 42 | (void *)offsetof(smtp_transport_options_block, dkim_canon) }, |
| 43 | { "dkim_domain", opt_stringptr, |
| 44 | (void *)offsetof(smtp_transport_options_block, dkim_domain) }, |
| 45 | { "dkim_private_key", opt_stringptr, |
| 46 | (void *)offsetof(smtp_transport_options_block, dkim_private_key) }, |
| 47 | { "dkim_selector", opt_stringptr, |
| 48 | (void *)offsetof(smtp_transport_options_block, dkim_selector) }, |
| 49 | { "dkim_sign_headers", opt_stringptr, |
| 50 | (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) }, |
| 51 | { "dkim_strict", opt_stringptr, |
| 52 | (void *)offsetof(smtp_transport_options_block, dkim_strict) }, |
| 53 | #endif |
| 54 | { "dns_qualify_single", opt_bool, |
| 55 | (void *)offsetof(smtp_transport_options_block, dns_qualify_single) }, |
| 56 | { "dns_search_parents", opt_bool, |
| 57 | (void *)offsetof(smtp_transport_options_block, dns_search_parents) }, |
| 58 | { "dscp", opt_stringptr, |
| 59 | (void *)offsetof(smtp_transport_options_block, dscp) }, |
| 60 | { "fallback_hosts", opt_stringptr, |
| 61 | (void *)offsetof(smtp_transport_options_block, fallback_hosts) }, |
| 62 | { "final_timeout", opt_time, |
| 63 | (void *)offsetof(smtp_transport_options_block, final_timeout) }, |
| 64 | { "gethostbyname", opt_bool, |
| 65 | (void *)offsetof(smtp_transport_options_block, gethostbyname) }, |
| 66 | #ifdef SUPPORT_TLS |
| 67 | /* These are no longer honoured, as of Exim 4.80; for now, we silently |
| 68 | ignore; a later release will warn, and a later-still release will remove |
| 69 | these options, so that using them becomes an error. */ |
| 70 | { "gnutls_require_kx", opt_stringptr, |
| 71 | (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) }, |
| 72 | { "gnutls_require_mac", opt_stringptr, |
| 73 | (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) }, |
| 74 | { "gnutls_require_protocols", opt_stringptr, |
| 75 | (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) }, |
| 76 | #endif |
| 77 | { "helo_data", opt_stringptr, |
| 78 | (void *)offsetof(smtp_transport_options_block, helo_data) }, |
| 79 | { "hosts", opt_stringptr, |
| 80 | (void *)offsetof(smtp_transport_options_block, hosts) }, |
| 81 | { "hosts_avoid_esmtp", opt_stringptr, |
| 82 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) }, |
| 83 | { "hosts_avoid_pipelining", opt_stringptr, |
| 84 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) }, |
| 85 | #ifdef SUPPORT_TLS |
| 86 | { "hosts_avoid_tls", opt_stringptr, |
| 87 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) }, |
| 88 | #endif |
| 89 | { "hosts_max_try", opt_int, |
| 90 | (void *)offsetof(smtp_transport_options_block, hosts_max_try) }, |
| 91 | { "hosts_max_try_hardlimit", opt_int, |
| 92 | (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) }, |
| 93 | #ifdef SUPPORT_TLS |
| 94 | { "hosts_nopass_tls", opt_stringptr, |
| 95 | (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) }, |
| 96 | #endif |
| 97 | { "hosts_override", opt_bool, |
| 98 | (void *)offsetof(smtp_transport_options_block, hosts_override) }, |
| 99 | { "hosts_randomize", opt_bool, |
| 100 | (void *)offsetof(smtp_transport_options_block, hosts_randomize) }, |
| 101 | { "hosts_require_auth", opt_stringptr, |
| 102 | (void *)offsetof(smtp_transport_options_block, hosts_require_auth) }, |
| 103 | #ifdef SUPPORT_TLS |
| 104 | { "hosts_require_tls", opt_stringptr, |
| 105 | (void *)offsetof(smtp_transport_options_block, hosts_require_tls) }, |
| 106 | #endif |
| 107 | { "hosts_try_auth", opt_stringptr, |
| 108 | (void *)offsetof(smtp_transport_options_block, hosts_try_auth) }, |
| 109 | #ifdef EXPERIMENTAL_PRDR |
| 110 | { "hosts_try_prdr", opt_stringptr, |
| 111 | (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) }, |
| 112 | #endif |
| 113 | #ifdef SUPPORT_TLS |
| 114 | { "hosts_verify_avoid_tls", opt_stringptr, |
| 115 | (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) }, |
| 116 | #endif |
| 117 | { "interface", opt_stringptr, |
| 118 | (void *)offsetof(smtp_transport_options_block, interface) }, |
| 119 | { "keepalive", opt_bool, |
| 120 | (void *)offsetof(smtp_transport_options_block, keepalive) }, |
| 121 | { "lmtp_ignore_quota", opt_bool, |
| 122 | (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) }, |
| 123 | { "max_rcpt", opt_int | opt_public, |
| 124 | (void *)offsetof(transport_instance, max_addresses) }, |
| 125 | { "multi_domain", opt_bool | opt_public, |
| 126 | (void *)offsetof(transport_instance, multi_domain) }, |
| 127 | { "port", opt_stringptr, |
| 128 | (void *)offsetof(smtp_transport_options_block, port) }, |
| 129 | { "protocol", opt_stringptr, |
| 130 | (void *)offsetof(smtp_transport_options_block, protocol) }, |
| 131 | { "retry_include_ip_address", opt_bool, |
| 132 | (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) }, |
| 133 | { "serialize_hosts", opt_stringptr, |
| 134 | (void *)offsetof(smtp_transport_options_block, serialize_hosts) }, |
| 135 | { "size_addition", opt_int, |
| 136 | (void *)offsetof(smtp_transport_options_block, size_addition) } |
| 137 | #ifdef SUPPORT_TLS |
| 138 | ,{ "tls_certificate", opt_stringptr, |
| 139 | (void *)offsetof(smtp_transport_options_block, tls_certificate) }, |
| 140 | { "tls_crl", opt_stringptr, |
| 141 | (void *)offsetof(smtp_transport_options_block, tls_crl) }, |
| 142 | { "tls_dh_min_bits", opt_int, |
| 143 | (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) }, |
| 144 | { "tls_privatekey", opt_stringptr, |
| 145 | (void *)offsetof(smtp_transport_options_block, tls_privatekey) }, |
| 146 | { "tls_require_ciphers", opt_stringptr, |
| 147 | (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) }, |
| 148 | { "tls_sni", opt_stringptr, |
| 149 | (void *)offsetof(smtp_transport_options_block, tls_sni) }, |
| 150 | { "tls_tempfail_tryclear", opt_bool, |
| 151 | (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) }, |
| 152 | { "tls_verify_certificates", opt_stringptr, |
| 153 | (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) } |
| 154 | #endif |
| 155 | }; |
| 156 | |
| 157 | /* Size of the options list. An extern variable has to be used so that its |
| 158 | address can appear in the tables drtables.c. */ |
| 159 | |
| 160 | int smtp_transport_options_count = |
| 161 | sizeof(smtp_transport_options)/sizeof(optionlist); |
| 162 | |
| 163 | /* Default private options block for the smtp transport. */ |
| 164 | |
| 165 | smtp_transport_options_block smtp_transport_option_defaults = { |
| 166 | NULL, /* hosts */ |
| 167 | NULL, /* fallback_hosts */ |
| 168 | NULL, /* hostlist */ |
| 169 | NULL, /* fallback_hostlist */ |
| 170 | NULL, /* authenticated_sender */ |
| 171 | US"$primary_hostname", /* helo_data */ |
| 172 | NULL, /* interface */ |
| 173 | NULL, /* port */ |
| 174 | US"smtp", /* protocol */ |
| 175 | NULL, /* DSCP */ |
| 176 | NULL, /* serialize_hosts */ |
| 177 | NULL, /* hosts_try_auth */ |
| 178 | NULL, /* hosts_require_auth */ |
| 179 | #ifdef EXPERIMENTAL_PRDR |
| 180 | NULL, /* hosts_try_prdr */ |
| 181 | #endif |
| 182 | NULL, /* hosts_require_tls */ |
| 183 | NULL, /* hosts_avoid_tls */ |
| 184 | US"*", /* hosts_verify_avoid_tls */ |
| 185 | NULL, /* hosts_avoid_pipelining */ |
| 186 | NULL, /* hosts_avoid_esmtp */ |
| 187 | NULL, /* hosts_nopass_tls */ |
| 188 | 5*60, /* command_timeout */ |
| 189 | 5*60, /* connect_timeout; shorter system default overrides */ |
| 190 | 5*60, /* data timeout */ |
| 191 | 10*60, /* final timeout */ |
| 192 | 1024, /* size_addition */ |
| 193 | 5, /* hosts_max_try */ |
| 194 | 50, /* hosts_max_try_hardlimit */ |
| 195 | TRUE, /* address_retry_include_sender */ |
| 196 | FALSE, /* allow_localhost */ |
| 197 | FALSE, /* authenticated_sender_force */ |
| 198 | FALSE, /* gethostbyname */ |
| 199 | TRUE, /* dns_qualify_single */ |
| 200 | FALSE, /* dns_search_parents */ |
| 201 | TRUE, /* delay_after_cutoff */ |
| 202 | FALSE, /* hosts_override */ |
| 203 | FALSE, /* hosts_randomize */ |
| 204 | TRUE, /* keepalive */ |
| 205 | FALSE, /* lmtp_ignore_quota */ |
| 206 | TRUE /* retry_include_ip_address */ |
| 207 | #ifdef SUPPORT_TLS |
| 208 | ,NULL, /* tls_certificate */ |
| 209 | NULL, /* tls_crl */ |
| 210 | NULL, /* tls_privatekey */ |
| 211 | NULL, /* tls_require_ciphers */ |
| 212 | NULL, /* gnutls_require_kx */ |
| 213 | NULL, /* gnutls_require_mac */ |
| 214 | NULL, /* gnutls_require_proto */ |
| 215 | NULL, /* tls_sni */ |
| 216 | NULL, /* tls_verify_certificates */ |
| 217 | EXIM_CLIENT_DH_DEFAULT_MIN_BITS, |
| 218 | /* tls_dh_min_bits */ |
| 219 | TRUE /* tls_tempfail_tryclear */ |
| 220 | #endif |
| 221 | #ifndef DISABLE_DKIM |
| 222 | ,NULL, /* dkim_canon */ |
| 223 | NULL, /* dkim_domain */ |
| 224 | NULL, /* dkim_private_key */ |
| 225 | NULL, /* dkim_selector */ |
| 226 | NULL, /* dkim_sign_headers */ |
| 227 | NULL /* dkim_strict */ |
| 228 | #endif |
| 229 | }; |
| 230 | |
| 231 | |
| 232 | /* Local statics */ |
| 233 | |
| 234 | static uschar *smtp_command; /* Points to last cmd for error messages */ |
| 235 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ |
| 236 | static BOOL update_waiting; /* TRUE to update the "wait" database */ |
| 237 | |
| 238 | |
| 239 | /************************************************* |
| 240 | * Setup entry point * |
| 241 | *************************************************/ |
| 242 | |
| 243 | /* This function is called when the transport is about to be used, |
| 244 | but before running it in a sub-process. It is used for two things: |
| 245 | |
| 246 | (1) To set the fallback host list in addresses, when delivering. |
| 247 | (2) To pass back the interface, port, protocol, and other options, for use |
| 248 | during callout verification. |
| 249 | |
| 250 | Arguments: |
| 251 | tblock pointer to the transport instance block |
| 252 | addrlist list of addresses about to be transported |
| 253 | tf if not NULL, pointer to block in which to return options |
| 254 | uid the uid that will be set (not used) |
| 255 | gid the gid that will be set (not used) |
| 256 | errmsg place for error message (not used) |
| 257 | |
| 258 | Returns: OK always (FAIL, DEFER not used) |
| 259 | */ |
| 260 | |
| 261 | static int |
| 262 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, |
| 263 | transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg) |
| 264 | { |
| 265 | smtp_transport_options_block *ob = |
| 266 | (smtp_transport_options_block *)(tblock->options_block); |
| 267 | |
| 268 | errmsg = errmsg; /* Keep picky compilers happy */ |
| 269 | uid = uid; |
| 270 | gid = gid; |
| 271 | |
| 272 | /* Pass back options if required. This interface is getting very messy. */ |
| 273 | |
| 274 | if (tf != NULL) |
| 275 | { |
| 276 | tf->interface = ob->interface; |
| 277 | tf->port = ob->port; |
| 278 | tf->protocol = ob->protocol; |
| 279 | tf->hosts = ob->hosts; |
| 280 | tf->hosts_override = ob->hosts_override; |
| 281 | tf->hosts_randomize = ob->hosts_randomize; |
| 282 | tf->gethostbyname = ob->gethostbyname; |
| 283 | tf->qualify_single = ob->dns_qualify_single; |
| 284 | tf->search_parents = ob->dns_search_parents; |
| 285 | tf->helo_data = ob->helo_data; |
| 286 | } |
| 287 | |
| 288 | /* Set the fallback host list for all the addresses that don't have fallback |
| 289 | host lists, provided that the local host wasn't present in the original host |
| 290 | list. */ |
| 291 | |
| 292 | if (!testflag(addrlist, af_local_host_removed)) |
| 293 | { |
| 294 | for (; addrlist != NULL; addrlist = addrlist->next) |
| 295 | if (addrlist->fallback_hosts == NULL) |
| 296 | addrlist->fallback_hosts = ob->fallback_hostlist; |
| 297 | } |
| 298 | |
| 299 | return OK; |
| 300 | } |
| 301 | |
| 302 | |
| 303 | |
| 304 | /************************************************* |
| 305 | * Initialization entry point * |
| 306 | *************************************************/ |
| 307 | |
| 308 | /* Called for each instance, after its options have been read, to |
| 309 | enable consistency checks to be done, or anything else that needs |
| 310 | to be set up. |
| 311 | |
| 312 | Argument: pointer to the transport instance block |
| 313 | Returns: nothing |
| 314 | */ |
| 315 | |
| 316 | void |
| 317 | smtp_transport_init(transport_instance *tblock) |
| 318 | { |
| 319 | smtp_transport_options_block *ob = |
| 320 | (smtp_transport_options_block *)(tblock->options_block); |
| 321 | |
| 322 | /* Retry_use_local_part defaults FALSE if unset */ |
| 323 | |
| 324 | if (tblock->retry_use_local_part == TRUE_UNSET) |
| 325 | tblock->retry_use_local_part = FALSE; |
| 326 | |
| 327 | /* Set the default port according to the protocol */ |
| 328 | |
| 329 | if (ob->port == NULL) |
| 330 | ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : |
| 331 | (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp"; |
| 332 | |
| 333 | /* Set up the setup entry point, to be called before subprocesses for this |
| 334 | transport. */ |
| 335 | |
| 336 | tblock->setup = smtp_transport_setup; |
| 337 | |
| 338 | /* Complain if any of the timeouts are zero. */ |
| 339 | |
| 340 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || |
| 341 | ob->final_timeout <= 0) |
| 342 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, |
| 343 | "command, data, or final timeout value is zero for %s transport", |
| 344 | tblock->name); |
| 345 | |
| 346 | /* If hosts_override is set and there are local hosts, set the global |
| 347 | flag that stops verify from showing router hosts. */ |
| 348 | |
| 349 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; |
| 350 | |
| 351 | /* If there are any fallback hosts listed, build a chain of host items |
| 352 | for them, but do not do any lookups at this time. */ |
| 353 | |
| 354 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); |
| 355 | } |
| 356 | |
| 357 | |
| 358 | |
| 359 | |
| 360 | |
| 361 | /************************************************* |
| 362 | * Set delivery info into all active addresses * |
| 363 | *************************************************/ |
| 364 | |
| 365 | /* Only addresses whose status is >= PENDING are relevant. A lesser |
| 366 | status means that an address is not currently being processed. |
| 367 | |
| 368 | Arguments: |
| 369 | addrlist points to a chain of addresses |
| 370 | errno_value to put in each address's errno field |
| 371 | msg to put in each address's message field |
| 372 | rc to put in each address's transport_return field |
| 373 | pass_message if TRUE, set the "pass message" flag in the address |
| 374 | |
| 375 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in |
| 376 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate |
| 377 | this particular type of timeout. |
| 378 | |
| 379 | Returns: nothing |
| 380 | */ |
| 381 | |
| 382 | static void |
| 383 | set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc, |
| 384 | BOOL pass_message) |
| 385 | { |
| 386 | address_item *addr; |
| 387 | int orvalue = 0; |
| 388 | if (errno_value == ERRNO_CONNECTTIMEOUT) |
| 389 | { |
| 390 | errno_value = ETIMEDOUT; |
| 391 | orvalue = RTEF_CTOUT; |
| 392 | } |
| 393 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 394 | { |
| 395 | if (addr->transport_return < PENDING) continue; |
| 396 | addr->basic_errno = errno_value; |
| 397 | addr->more_errno |= orvalue; |
| 398 | if (msg != NULL) |
| 399 | { |
| 400 | addr->message = msg; |
| 401 | if (pass_message) setflag(addr, af_pass_message); |
| 402 | } |
| 403 | addr->transport_return = rc; |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | |
| 408 | |
| 409 | /************************************************* |
| 410 | * Check an SMTP response * |
| 411 | *************************************************/ |
| 412 | |
| 413 | /* This function is given an errno code and the SMTP response buffer |
| 414 | to analyse, together with the host identification for generating messages. It |
| 415 | sets an appropriate message and puts the first digit of the response code into |
| 416 | the yield variable. If no response was actually read, a suitable digit is |
| 417 | chosen. |
| 418 | |
| 419 | Arguments: |
| 420 | host the current host, to get its name for messages |
| 421 | errno_value pointer to the errno value |
| 422 | more_errno from the top address for use with ERRNO_FILTER_FAIL |
| 423 | buffer the SMTP response buffer |
| 424 | yield where to put a one-digit SMTP response code |
| 425 | message where to put an errror message |
| 426 | pass_message set TRUE if message is an SMTP response |
| 427 | |
| 428 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE |
| 429 | */ |
| 430 | |
| 431 | static BOOL check_response(host_item *host, int *errno_value, int more_errno, |
| 432 | uschar *buffer, int *yield, uschar **message, BOOL *pass_message) |
| 433 | { |
| 434 | uschar *pl = US""; |
| 435 | |
| 436 | if (smtp_use_pipelining && |
| 437 | (Ustrcmp(smtp_command, "MAIL") == 0 || |
| 438 | Ustrcmp(smtp_command, "RCPT") == 0 || |
| 439 | Ustrcmp(smtp_command, "DATA") == 0)) |
| 440 | pl = US"pipelined "; |
| 441 | |
| 442 | *yield = '4'; /* Default setting is to give a temporary error */ |
| 443 | |
| 444 | /* Handle response timeout */ |
| 445 | |
| 446 | if (*errno_value == ETIMEDOUT) |
| 447 | { |
| 448 | *message = US string_sprintf("SMTP timeout while connected to %s [%s] " |
| 449 | "after %s%s", host->name, host->address, pl, smtp_command); |
| 450 | if (transport_count > 0) |
| 451 | *message = US string_sprintf("%s (%d bytes written)", *message, |
| 452 | transport_count); |
| 453 | return FALSE; |
| 454 | } |
| 455 | |
| 456 | /* Handle malformed SMTP response */ |
| 457 | |
| 458 | if (*errno_value == ERRNO_SMTPFORMAT) |
| 459 | { |
| 460 | uschar *malfresp = string_printing(buffer); |
| 461 | while (isspace(*malfresp)) malfresp++; |
| 462 | if (*malfresp == 0) |
| 463 | *message = string_sprintf("Malformed SMTP reply (an empty line) from " |
| 464 | "%s [%s] in response to %s%s", host->name, host->address, pl, |
| 465 | smtp_command); |
| 466 | else |
| 467 | *message = string_sprintf("Malformed SMTP reply from %s [%s] in response " |
| 468 | "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp); |
| 469 | return FALSE; |
| 470 | } |
| 471 | |
| 472 | /* Handle a failed filter process error; can't send QUIT as we mustn't |
| 473 | end the DATA. */ |
| 474 | |
| 475 | if (*errno_value == ERRNO_FILTER_FAIL) |
| 476 | { |
| 477 | *message = US string_sprintf("transport filter process failed (%d)%s", |
| 478 | more_errno, |
| 479 | (more_errno == EX_EXECFAILED)? ": unable to execute command" : ""); |
| 480 | return FALSE; |
| 481 | } |
| 482 | |
| 483 | /* Handle a failed add_headers expansion; can't send QUIT as we mustn't |
| 484 | end the DATA. */ |
| 485 | |
| 486 | if (*errno_value == ERRNO_CHHEADER_FAIL) |
| 487 | { |
| 488 | *message = |
| 489 | US string_sprintf("failed to expand headers_add or headers_remove: %s", |
| 490 | expand_string_message); |
| 491 | return FALSE; |
| 492 | } |
| 493 | |
| 494 | /* Handle failure to write a complete data block */ |
| 495 | |
| 496 | if (*errno_value == ERRNO_WRITEINCOMPLETE) |
| 497 | { |
| 498 | *message = US string_sprintf("failed to write a data block"); |
| 499 | return FALSE; |
| 500 | } |
| 501 | |
| 502 | /* Handle error responses from the remote mailer. */ |
| 503 | |
| 504 | if (buffer[0] != 0) |
| 505 | { |
| 506 | uschar *s = string_printing(buffer); |
| 507 | *message = US string_sprintf("SMTP error from remote mail server after %s%s: " |
| 508 | "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s); |
| 509 | *pass_message = TRUE; |
| 510 | *yield = buffer[0]; |
| 511 | return TRUE; |
| 512 | } |
| 513 | |
| 514 | /* No data was read. If there is no errno, this must be the EOF (i.e. |
| 515 | connection closed) case, which causes deferral. An explicit connection reset |
| 516 | error has the same effect. Otherwise, put the host's identity in the message, |
| 517 | leaving the errno value to be interpreted as well. In all cases, we have to |
| 518 | assume the connection is now dead. */ |
| 519 | |
| 520 | if (*errno_value == 0 || *errno_value == ECONNRESET) |
| 521 | { |
| 522 | *errno_value = ERRNO_SMTPCLOSED; |
| 523 | *message = US string_sprintf("Remote host %s [%s] closed connection " |
| 524 | "in response to %s%s", host->name, host->address, pl, smtp_command); |
| 525 | } |
| 526 | else *message = US string_sprintf("%s [%s]", host->name, host->address); |
| 527 | |
| 528 | return FALSE; |
| 529 | } |
| 530 | |
| 531 | |
| 532 | |
| 533 | /************************************************* |
| 534 | * Write error message to logs * |
| 535 | *************************************************/ |
| 536 | |
| 537 | /* This writes to the main log and to the message log. |
| 538 | |
| 539 | Arguments: |
| 540 | addr the address item containing error information |
| 541 | host the current host |
| 542 | |
| 543 | Returns: nothing |
| 544 | */ |
| 545 | |
| 546 | static void |
| 547 | write_logs(address_item *addr, host_item *host) |
| 548 | { |
| 549 | if (addr->message != NULL) |
| 550 | { |
| 551 | uschar *message = addr->message; |
| 552 | if (addr->basic_errno > 0) |
| 553 | message = string_sprintf("%s: %s", message, strerror(addr->basic_errno)); |
| 554 | log_write(0, LOG_MAIN, "%s", message); |
| 555 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); |
| 556 | } |
| 557 | else |
| 558 | { |
| 559 | uschar *msg = |
| 560 | ((log_extra_selector & LX_outgoing_port) != 0)? |
| 561 | string_sprintf("%s [%s]:%d", host->name, host->address, |
| 562 | (host->port == PORT_NONE)? 25 : host->port) |
| 563 | : |
| 564 | string_sprintf("%s [%s]", host->name, host->address); |
| 565 | log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno)); |
| 566 | deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg, |
| 567 | strerror(addr->basic_errno)); |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | |
| 572 | |
| 573 | /************************************************* |
| 574 | * Synchronize SMTP responses * |
| 575 | *************************************************/ |
| 576 | |
| 577 | /* This function is called from smtp_deliver() to receive SMTP responses from |
| 578 | the server, and match them up with the commands to which they relate. When |
| 579 | PIPELINING is not in use, this function is called after every command, and is |
| 580 | therefore somewhat over-engineered, but it is simpler to use a single scheme |
| 581 | that works both with and without PIPELINING instead of having two separate sets |
| 582 | of code. |
| 583 | |
| 584 | The set of commands that are buffered up with pipelining may start with MAIL |
| 585 | and may end with DATA; in between are RCPT commands that correspond to the |
| 586 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, |
| 587 | etc.) are never buffered. |
| 588 | |
| 589 | Errors after MAIL or DATA abort the whole process leaving the response in the |
| 590 | buffer. After MAIL, pending responses are flushed, and the original command is |
| 591 | re-instated in big_buffer for error messages. For RCPT commands, the remote is |
| 592 | permitted to reject some recipient addresses while accepting others. However |
| 593 | certain errors clearly abort the whole process. Set the value in |
| 594 | transport_return to PENDING_OK if the address is accepted. If there is a |
| 595 | subsequent general error, it will get reset accordingly. If not, it will get |
| 596 | converted to OK at the end. |
| 597 | |
| 598 | Arguments: |
| 599 | addrlist the complete address list |
| 600 | include_affixes TRUE if affixes include in RCPT |
| 601 | sync_addr ptr to the ptr of the one to start scanning at (updated) |
| 602 | host the host we are connected to |
| 603 | count the number of responses to read |
| 604 | address_retry_ |
| 605 | include_sender true if 4xx retry is to include the sender it its key |
| 606 | pending_MAIL true if the first response is for MAIL |
| 607 | pending_DATA 0 if last command sent was not DATA |
| 608 | +1 if previously had a good recipient |
| 609 | -1 if not previously had a good recipient |
| 610 | inblock incoming SMTP block |
| 611 | timeout timeout value |
| 612 | buffer buffer for reading response |
| 613 | buffsize size of buffer |
| 614 | |
| 615 | Returns: 3 if at least one address had 2xx and one had 5xx |
| 616 | 2 if at least one address had 5xx but none had 2xx |
| 617 | 1 if at least one host had a 2xx response, but none had 5xx |
| 618 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) |
| 619 | -1 timeout while reading RCPT response |
| 620 | -2 I/O or other non-response error for RCPT |
| 621 | -3 DATA or MAIL failed - errno and buffer set |
| 622 | */ |
| 623 | |
| 624 | static int |
| 625 | sync_responses(address_item *addrlist, BOOL include_affixes, |
| 626 | address_item **sync_addr, host_item *host, int count, |
| 627 | BOOL address_retry_include_sender, BOOL pending_MAIL, |
| 628 | int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer, |
| 629 | int buffsize) |
| 630 | { |
| 631 | address_item *addr = *sync_addr; |
| 632 | int yield = 0; |
| 633 | |
| 634 | /* Handle the response for a MAIL command. On error, reinstate the original |
| 635 | command in big_buffer for error message use, and flush any further pending |
| 636 | responses before returning, except after I/O errors and timeouts. */ |
| 637 | |
| 638 | if (pending_MAIL) |
| 639 | { |
| 640 | count--; |
| 641 | if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout)) |
| 642 | { |
| 643 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ |
| 644 | if (errno == 0 && buffer[0] != 0) |
| 645 | { |
| 646 | uschar flushbuffer[4096]; |
| 647 | int save_errno = 0; |
| 648 | if (buffer[0] == '4') |
| 649 | { |
| 650 | save_errno = ERRNO_MAIL4XX; |
| 651 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 652 | } |
| 653 | while (count-- > 0) |
| 654 | { |
| 655 | if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer), |
| 656 | '2', timeout) |
| 657 | && (errno != 0 || flushbuffer[0] == 0)) |
| 658 | break; |
| 659 | } |
| 660 | errno = save_errno; |
| 661 | } |
| 662 | return -3; |
| 663 | } |
| 664 | } |
| 665 | |
| 666 | if (pending_DATA) count--; /* Number of RCPT responses to come */ |
| 667 | |
| 668 | /* Read and handle the required number of RCPT responses, matching each one up |
| 669 | with an address by scanning for the next address whose status is PENDING_DEFER. |
| 670 | */ |
| 671 | |
| 672 | while (count-- > 0) |
| 673 | { |
| 674 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; |
| 675 | |
| 676 | /* The address was accepted */ |
| 677 | |
| 678 | if (smtp_read_response(inblock, buffer, buffsize, '2', timeout)) |
| 679 | { |
| 680 | yield |= 1; |
| 681 | addr->transport_return = PENDING_OK; |
| 682 | |
| 683 | /* If af_dr_retry_exists is set, there was a routing delay on this address; |
| 684 | ensure that any address-specific retry record is expunged. We do this both |
| 685 | for the basic key and for the version that also includes the sender. */ |
| 686 | |
| 687 | if (testflag(addr, af_dr_retry_exists)) |
| 688 | { |
| 689 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, |
| 690 | sender_address); |
| 691 | retry_add_item(addr, altkey, rf_delete); |
| 692 | retry_add_item(addr, addr->address_retry_key, rf_delete); |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | /* Timeout while reading the response */ |
| 697 | |
| 698 | else if (errno == ETIMEDOUT) |
| 699 | { |
| 700 | int save_errno = errno; |
| 701 | uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] " |
| 702 | "after RCPT TO:<%s>", host->name, host->address, |
| 703 | transport_rcpt_address(addr, include_affixes)); |
| 704 | set_errno(addrlist, save_errno, message, DEFER, FALSE); |
| 705 | retry_add_item(addr, addr->address_retry_key, 0); |
| 706 | update_waiting = FALSE; |
| 707 | return -1; |
| 708 | } |
| 709 | |
| 710 | /* Handle other errors in obtaining an SMTP response by returning -1. This |
| 711 | will cause all the addresses to be deferred. Restore the SMTP command in |
| 712 | big_buffer for which we are checking the response, so the error message |
| 713 | makes sense. */ |
| 714 | |
| 715 | else if (errno != 0 || buffer[0] == 0) |
| 716 | { |
| 717 | string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>", |
| 718 | transport_rcpt_address(addr, include_affixes)); |
| 719 | return -2; |
| 720 | } |
| 721 | |
| 722 | /* Handle SMTP permanent and temporary response codes. */ |
| 723 | |
| 724 | else |
| 725 | { |
| 726 | addr->message = |
| 727 | string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: " |
| 728 | "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes), |
| 729 | host->name, host->address, string_printing(buffer)); |
| 730 | setflag(addr, af_pass_message); |
| 731 | deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message); |
| 732 | |
| 733 | /* The response was 5xx */ |
| 734 | |
| 735 | if (buffer[0] == '5') |
| 736 | { |
| 737 | addr->transport_return = FAIL; |
| 738 | yield |= 2; |
| 739 | } |
| 740 | |
| 741 | /* The response was 4xx */ |
| 742 | |
| 743 | else |
| 744 | { |
| 745 | addr->transport_return = DEFER; |
| 746 | addr->basic_errno = ERRNO_RCPT4XX; |
| 747 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 748 | |
| 749 | /* Log temporary errors if there are more hosts to be tried. */ |
| 750 | |
| 751 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message); |
| 752 | |
| 753 | /* Do not put this message on the list of those waiting for specific |
| 754 | hosts, as otherwise it is likely to be tried too often. */ |
| 755 | |
| 756 | update_waiting = FALSE; |
| 757 | |
| 758 | /* Add a retry item for the address so that it doesn't get tried again |
| 759 | too soon. If address_retry_include_sender is true, add the sender address |
| 760 | to the retry key. */ |
| 761 | |
| 762 | if (address_retry_include_sender) |
| 763 | { |
| 764 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, |
| 765 | sender_address); |
| 766 | retry_add_item(addr, altkey, 0); |
| 767 | } |
| 768 | else retry_add_item(addr, addr->address_retry_key, 0); |
| 769 | } |
| 770 | } |
| 771 | } /* Loop for next RCPT response */ |
| 772 | |
| 773 | /* Update where to start at for the next block of responses, unless we |
| 774 | have already handled all the addresses. */ |
| 775 | |
| 776 | if (addr != NULL) *sync_addr = addr->next; |
| 777 | |
| 778 | /* Handle a response to DATA. If we have not had any good recipients, either |
| 779 | previously or in this block, the response is ignored. */ |
| 780 | |
| 781 | if (pending_DATA != 0 && |
| 782 | !smtp_read_response(inblock, buffer, buffsize, '3', timeout)) |
| 783 | { |
| 784 | int code; |
| 785 | uschar *msg; |
| 786 | BOOL pass_message; |
| 787 | if (pending_DATA > 0 || (yield & 1) != 0) |
| 788 | { |
| 789 | if (errno == 0 && buffer[0] == '4') |
| 790 | { |
| 791 | errno = ERRNO_DATA4XX; |
| 792 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 793 | } |
| 794 | return -3; |
| 795 | } |
| 796 | (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message); |
| 797 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " |
| 798 | "is in use and there were no good recipients\n", msg); |
| 799 | } |
| 800 | |
| 801 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if |
| 802 | present) received 3xx. If any RCPTs were handled and yielded anything other |
| 803 | than 4xx, yield will be set non-zero. */ |
| 804 | |
| 805 | return yield; |
| 806 | } |
| 807 | |
| 808 | |
| 809 | |
| 810 | /************************************************* |
| 811 | * Deliver address list to given host * |
| 812 | *************************************************/ |
| 813 | |
| 814 | /* If continue_hostname is not null, we get here only when continuing to |
| 815 | deliver down an existing channel. The channel was passed as the standard |
| 816 | input. TLS is never active on a passed channel; the previous process always |
| 817 | closes it down before passing the connection on. |
| 818 | |
| 819 | Otherwise, we have to make a connection to the remote host, and do the |
| 820 | initial protocol exchange. |
| 821 | |
| 822 | When running as an MUA wrapper, if the sender or any recipient is rejected, |
| 823 | temporarily or permanently, we force failure for all recipients. |
| 824 | |
| 825 | Arguments: |
| 826 | addrlist chain of potential addresses to deliver; only those whose |
| 827 | transport_return field is set to PENDING_DEFER are currently |
| 828 | being processed; others should be skipped - they have either |
| 829 | been delivered to an earlier host or IP address, or been |
| 830 | failed by one of them. |
| 831 | host host to deliver to |
| 832 | host_af AF_INET or AF_INET6 |
| 833 | port default TCP/IP port to use, in host byte order |
| 834 | interface interface to bind to, or NULL |
| 835 | tblock transport instance block |
| 836 | copy_host TRUE if host set in addr->host_used must be copied, because |
| 837 | it is specific to this call of the transport |
| 838 | message_defer set TRUE if yield is OK, but all addresses were deferred |
| 839 | because of a non-recipient, non-host failure, that is, a |
| 840 | 4xx response to MAIL FROM, DATA, or ".". This is a defer |
| 841 | that is specific to the message. |
| 842 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for |
| 843 | a second attempt after TLS initialization fails |
| 844 | |
| 845 | Returns: OK - the connection was made and the delivery attempted; |
| 846 | the result for each address is in its data block. |
| 847 | DEFER - the connection could not be made, or something failed |
| 848 | while setting up the SMTP session, or there was a |
| 849 | non-message-specific error, such as a timeout. |
| 850 | ERROR - a filter command is specified for this transport, |
| 851 | and there was a problem setting it up; OR helo_data |
| 852 | or add_headers or authenticated_sender is specified |
| 853 | for this transport, and the string failed to expand |
| 854 | */ |
| 855 | |
| 856 | static int |
| 857 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port, |
| 858 | uschar *interface, transport_instance *tblock, BOOL copy_host, |
| 859 | BOOL *message_defer, BOOL suppress_tls) |
| 860 | { |
| 861 | address_item *addr; |
| 862 | address_item *sync_addr; |
| 863 | address_item *first_addr = addrlist; |
| 864 | int yield = OK; |
| 865 | int address_count; |
| 866 | int save_errno; |
| 867 | int rc; |
| 868 | time_t start_delivery_time = time(NULL); |
| 869 | smtp_transport_options_block *ob = |
| 870 | (smtp_transport_options_block *)(tblock->options_block); |
| 871 | BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0; |
| 872 | BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0; |
| 873 | BOOL ok = FALSE; |
| 874 | BOOL send_rset = TRUE; |
| 875 | BOOL send_quit = TRUE; |
| 876 | BOOL setting_up = TRUE; |
| 877 | BOOL completed_address = FALSE; |
| 878 | BOOL esmtp = TRUE; |
| 879 | BOOL pending_MAIL; |
| 880 | BOOL pass_message = FALSE; |
| 881 | #ifdef EXPERIMENTAL_PRDR |
| 882 | BOOL prdr_offered = FALSE; |
| 883 | BOOL prdr_active; |
| 884 | #endif |
| 885 | smtp_inblock inblock; |
| 886 | smtp_outblock outblock; |
| 887 | int max_rcpt = tblock->max_addresses; |
| 888 | uschar *igquotstr = US""; |
| 889 | uschar *local_authenticated_sender = authenticated_sender; |
| 890 | uschar *helo_data = NULL; |
| 891 | uschar *message = NULL; |
| 892 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; |
| 893 | uschar *p; |
| 894 | uschar buffer[4096]; |
| 895 | uschar inbuffer[4096]; |
| 896 | uschar outbuffer[1024]; |
| 897 | |
| 898 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ |
| 899 | |
| 900 | *message_defer = FALSE; |
| 901 | smtp_command = US"initial connection"; |
| 902 | if (max_rcpt == 0) max_rcpt = 999999; |
| 903 | |
| 904 | /* Set up the buffer for reading SMTP response packets. */ |
| 905 | |
| 906 | inblock.buffer = inbuffer; |
| 907 | inblock.buffersize = sizeof(inbuffer); |
| 908 | inblock.ptr = inbuffer; |
| 909 | inblock.ptrend = inbuffer; |
| 910 | |
| 911 | /* Set up the buffer for holding SMTP commands while pipelining */ |
| 912 | |
| 913 | outblock.buffer = outbuffer; |
| 914 | outblock.buffersize = sizeof(outbuffer); |
| 915 | outblock.ptr = outbuffer; |
| 916 | outblock.cmd_count = 0; |
| 917 | outblock.authenticating = FALSE; |
| 918 | |
| 919 | /* Reset the parameters of a TLS session. */ |
| 920 | |
| 921 | tls_in.bits = 0; |
| 922 | tls_in.cipher = NULL; /* for back-compatible behaviour */ |
| 923 | tls_in.peerdn = NULL; |
| 924 | #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS) |
| 925 | tls_in.sni = NULL; |
| 926 | #endif |
| 927 | |
| 928 | tls_out.bits = 0; |
| 929 | tls_out.cipher = NULL; /* the one we may use for this transport */ |
| 930 | tls_out.peerdn = NULL; |
| 931 | #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS) |
| 932 | tls_out.sni = NULL; |
| 933 | #endif |
| 934 | |
| 935 | #ifndef SUPPORT_TLS |
| 936 | if (smtps) |
| 937 | { |
| 938 | set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE); |
| 939 | return ERROR; |
| 940 | } |
| 941 | #endif |
| 942 | |
| 943 | /* Make a connection to the host if this isn't a continued delivery, and handle |
| 944 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled |
| 945 | specially so they can be identified for retries. */ |
| 946 | |
| 947 | if (continue_hostname == NULL) |
| 948 | { |
| 949 | inblock.sock = outblock.sock = |
| 950 | smtp_connect(host, host_af, port, interface, ob->connect_timeout, |
| 951 | ob->keepalive, ob->dscp); /* This puts port into host->port */ |
| 952 | |
| 953 | if (inblock.sock < 0) |
| 954 | { |
| 955 | set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno, |
| 956 | NULL, DEFER, FALSE); |
| 957 | return DEFER; |
| 958 | } |
| 959 | |
| 960 | /* Expand the greeting message while waiting for the initial response. (Makes |
| 961 | sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is |
| 962 | delayed till here so that $sending_interface and $sending_port are set. */ |
| 963 | |
| 964 | helo_data = expand_string(ob->helo_data); |
| 965 | |
| 966 | /* The first thing is to wait for an initial OK response. The dreaded "goto" |
| 967 | is nevertheless a reasonably clean way of programming this kind of logic, |
| 968 | where you want to escape on any error. */ |
| 969 | |
| 970 | if (!smtps) |
| 971 | { |
| 972 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 973 | ob->command_timeout)) goto RESPONSE_FAILED; |
| 974 | |
| 975 | /* Now check if the helo_data expansion went well, and sign off cleanly if |
| 976 | it didn't. */ |
| 977 | |
| 978 | if (helo_data == NULL) |
| 979 | { |
| 980 | uschar *message = string_sprintf("failed to expand helo_data: %s", |
| 981 | expand_string_message); |
| 982 | set_errno(addrlist, 0, message, DEFER, FALSE); |
| 983 | yield = DEFER; |
| 984 | goto SEND_QUIT; |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | /** Debugging without sending a message |
| 989 | addrlist->transport_return = DEFER; |
| 990 | goto SEND_QUIT; |
| 991 | **/ |
| 992 | |
| 993 | /* Errors that occur after this point follow an SMTP command, which is |
| 994 | left in big_buffer by smtp_write_command() for use in error messages. */ |
| 995 | |
| 996 | smtp_command = big_buffer; |
| 997 | |
| 998 | /* Tell the remote who we are... |
| 999 | |
| 1000 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the |
| 1001 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the |
| 1002 | greeting is of this form. The assumption was that the far end supports it |
| 1003 | properly... but experience shows that there are some that give 5xx responses, |
| 1004 | even though the banner includes "ESMTP" (there's a bloody-minded one that |
| 1005 | says "ESMTP not spoken here"). Cope with that case. |
| 1006 | |
| 1007 | September 2000: Time has passed, and it seems reasonable now to always send |
| 1008 | EHLO at the start. It is also convenient to make the change while installing |
| 1009 | the TLS stuff. |
| 1010 | |
| 1011 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" |
| 1012 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There |
| 1013 | would be no way to send out the mails, so there is now a host list |
| 1014 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the |
| 1015 | PIPELINING problem as well. Maybe it can also be useful to cure other |
| 1016 | problems with broken servers. |
| 1017 | |
| 1018 | Exim originally sent "Helo" at this point and ran for nearly a year that way. |
| 1019 | Then somebody tried it with a Microsoft mailer... It seems that all other |
| 1020 | mailers use upper case for some reason (the RFC is quite clear about case |
| 1021 | independence) so, for peace of mind, I gave in. */ |
| 1022 | |
| 1023 | esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL, |
| 1024 | host->name, host->address, NULL) != OK; |
| 1025 | |
| 1026 | /* Alas; be careful, since this goto is not an error-out, so conceivably |
| 1027 | we might set data between here and the target which we assume to exist |
| 1028 | and be usable. I can see this coming back to bite us. */ |
| 1029 | #ifdef SUPPORT_TLS |
| 1030 | if (smtps) |
| 1031 | { |
| 1032 | tls_offered = TRUE; |
| 1033 | suppress_tls = FALSE; |
| 1034 | ob->tls_tempfail_tryclear = FALSE; |
| 1035 | smtp_command = US"SSL-on-connect"; |
| 1036 | goto TLS_NEGOTIATE; |
| 1037 | } |
| 1038 | #endif |
| 1039 | |
| 1040 | if (esmtp) |
| 1041 | { |
| 1042 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", |
| 1043 | lmtp? "LHLO" : "EHLO", helo_data) < 0) |
| 1044 | goto SEND_FAILED; |
| 1045 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1046 | ob->command_timeout)) |
| 1047 | { |
| 1048 | if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED; |
| 1049 | esmtp = FALSE; |
| 1050 | } |
| 1051 | } |
| 1052 | else |
| 1053 | { |
| 1054 | DEBUG(D_transport) |
| 1055 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); |
| 1056 | } |
| 1057 | |
| 1058 | if (!esmtp) |
| 1059 | { |
| 1060 | if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0) |
| 1061 | goto SEND_FAILED; |
| 1062 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1063 | ob->command_timeout)) goto RESPONSE_FAILED; |
| 1064 | } |
| 1065 | |
| 1066 | /* Set IGNOREQUOTA if the response to LHLO specifies support and the |
| 1067 | lmtp_ignore_quota option was set. */ |
| 1068 | |
| 1069 | igquotstr = (lmtp && ob->lmtp_ignore_quota && |
| 1070 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, |
| 1071 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; |
| 1072 | |
| 1073 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ |
| 1074 | |
| 1075 | #ifdef SUPPORT_TLS |
| 1076 | tls_offered = esmtp && |
| 1077 | pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0, |
| 1078 | PCRE_EOPT, NULL, 0) >= 0; |
| 1079 | #endif |
| 1080 | |
| 1081 | #ifdef EXPERIMENTAL_PRDR |
| 1082 | prdr_offered = esmtp && |
| 1083 | (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0, |
| 1084 | PCRE_EOPT, NULL, 0) >= 0) && |
| 1085 | (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name, |
| 1086 | host->address, NULL) == OK); |
| 1087 | |
| 1088 | if (prdr_offered) |
| 1089 | {DEBUG(D_transport) debug_printf("PRDR usable\n");} |
| 1090 | #endif |
| 1091 | } |
| 1092 | |
| 1093 | /* For continuing deliveries down the same channel, the socket is the standard |
| 1094 | input, and we don't need to redo EHLO here (but may need to do so for TLS - see |
| 1095 | below). Set up the pointer to where subsequent commands will be left, for |
| 1096 | error messages. Note that smtp_use_size and smtp_use_pipelining will have been |
| 1097 | set from the command line if they were set in the process that passed the |
| 1098 | connection on. */ |
| 1099 | |
| 1100 | else |
| 1101 | { |
| 1102 | inblock.sock = outblock.sock = fileno(stdin); |
| 1103 | smtp_command = big_buffer; |
| 1104 | host->port = port; /* Record the port that was used */ |
| 1105 | } |
| 1106 | |
| 1107 | /* If TLS is available on this connection, whether continued or not, attempt to |
| 1108 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, |
| 1109 | send another EHLO - the server may give a different answer in secure mode. We |
| 1110 | use a separate buffer for reading the response to STARTTLS so that if it is |
| 1111 | negative, the original EHLO data is available for subsequent analysis, should |
| 1112 | the client not be required to use TLS. If the response is bad, copy the buffer |
| 1113 | for error analysis. */ |
| 1114 | |
| 1115 | #ifdef SUPPORT_TLS |
| 1116 | if (tls_offered && !suppress_tls && |
| 1117 | verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name, |
| 1118 | host->address, NULL) != OK) |
| 1119 | { |
| 1120 | uschar buffer2[4096]; |
| 1121 | if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0) |
| 1122 | goto SEND_FAILED; |
| 1123 | |
| 1124 | /* If there is an I/O error, transmission of this message is deferred. If |
| 1125 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is |
| 1126 | false, we also defer. However, if there is a temporary rejection of STARTTLS |
| 1127 | and tls_tempfail_tryclear is true, or if there is an outright rejection of |
| 1128 | STARTTLS, we carry on. This means we will try to send the message in clear, |
| 1129 | unless the host is in hosts_require_tls (tested below). */ |
| 1130 | |
| 1131 | if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2', |
| 1132 | ob->command_timeout)) |
| 1133 | { |
| 1134 | if (errno != 0 || buffer2[0] == 0 || |
| 1135 | (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)) |
| 1136 | { |
| 1137 | Ustrncpy(buffer, buffer2, sizeof(buffer)); |
| 1138 | goto RESPONSE_FAILED; |
| 1139 | } |
| 1140 | } |
| 1141 | |
| 1142 | /* STARTTLS accepted: try to negotiate a TLS session. */ |
| 1143 | |
| 1144 | else |
| 1145 | TLS_NEGOTIATE: |
| 1146 | { |
| 1147 | int rc = tls_client_start(inblock.sock, |
| 1148 | host, |
| 1149 | addrlist, |
| 1150 | NULL, /* No DH param */ |
| 1151 | ob->tls_certificate, |
| 1152 | ob->tls_privatekey, |
| 1153 | ob->tls_sni, |
| 1154 | ob->tls_verify_certificates, |
| 1155 | ob->tls_crl, |
| 1156 | ob->tls_require_ciphers, |
| 1157 | ob->tls_dh_min_bits, |
| 1158 | ob->command_timeout); |
| 1159 | |
| 1160 | /* TLS negotiation failed; give an error. From outside, this function may |
| 1161 | be called again to try in clear on a new connection, if the options permit |
| 1162 | it for this host. */ |
| 1163 | |
| 1164 | if (rc != OK) |
| 1165 | { |
| 1166 | save_errno = ERRNO_TLSFAILURE; |
| 1167 | message = US"failure while setting up TLS session"; |
| 1168 | send_quit = FALSE; |
| 1169 | goto TLS_FAILED; |
| 1170 | } |
| 1171 | |
| 1172 | /* TLS session is set up */ |
| 1173 | |
| 1174 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 1175 | { |
| 1176 | if (addr->transport_return == PENDING_DEFER) |
| 1177 | { |
| 1178 | addr->cipher = tls_out.cipher; |
| 1179 | addr->peerdn = tls_out.peerdn; |
| 1180 | } |
| 1181 | } |
| 1182 | } |
| 1183 | } |
| 1184 | |
| 1185 | /* if smtps, we'll have smtp_command set to something else; always safe to |
| 1186 | reset it here. */ |
| 1187 | smtp_command = big_buffer; |
| 1188 | |
| 1189 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If |
| 1190 | helo_data is null, we are dealing with a connection that was passed from |
| 1191 | another process, and so we won't have expanded helo_data above. We have to |
| 1192 | expand it here. $sending_ip_address and $sending_port are set up right at the |
| 1193 | start of the Exim process (in exim.c). */ |
| 1194 | |
| 1195 | if (tls_out.active >= 0) |
| 1196 | { |
| 1197 | char *greeting_cmd; |
| 1198 | if (helo_data == NULL) |
| 1199 | { |
| 1200 | helo_data = expand_string(ob->helo_data); |
| 1201 | if (helo_data == NULL) |
| 1202 | { |
| 1203 | uschar *message = string_sprintf("failed to expand helo_data: %s", |
| 1204 | expand_string_message); |
| 1205 | set_errno(addrlist, 0, message, DEFER, FALSE); |
| 1206 | yield = DEFER; |
| 1207 | goto SEND_QUIT; |
| 1208 | } |
| 1209 | } |
| 1210 | |
| 1211 | /* For SMTPS we need to wait for the initial OK response. */ |
| 1212 | if (smtps) |
| 1213 | { |
| 1214 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1215 | ob->command_timeout)) goto RESPONSE_FAILED; |
| 1216 | } |
| 1217 | |
| 1218 | if (esmtp) |
| 1219 | greeting_cmd = "EHLO"; |
| 1220 | else |
| 1221 | { |
| 1222 | greeting_cmd = "HELO"; |
| 1223 | DEBUG(D_transport) |
| 1224 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); |
| 1225 | } |
| 1226 | |
| 1227 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", |
| 1228 | lmtp? "LHLO" : greeting_cmd, helo_data) < 0) |
| 1229 | goto SEND_FAILED; |
| 1230 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1231 | ob->command_timeout)) |
| 1232 | goto RESPONSE_FAILED; |
| 1233 | } |
| 1234 | |
| 1235 | /* If the host is required to use a secure channel, ensure that we |
| 1236 | have one. */ |
| 1237 | |
| 1238 | else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, |
| 1239 | host->address, NULL) == OK) |
| 1240 | { |
| 1241 | save_errno = ERRNO_TLSREQUIRED; |
| 1242 | message = string_sprintf("a TLS session is required for %s [%s], but %s", |
| 1243 | host->name, host->address, |
| 1244 | tls_offered? "an attempt to start TLS failed" : |
| 1245 | "the server did not offer TLS support"); |
| 1246 | goto TLS_FAILED; |
| 1247 | } |
| 1248 | #endif |
| 1249 | |
| 1250 | /* If TLS is active, we have just started it up and re-done the EHLO command, |
| 1251 | so its response needs to be analyzed. If TLS is not active and this is a |
| 1252 | continued session down a previously-used socket, we haven't just done EHLO, so |
| 1253 | we skip this. */ |
| 1254 | |
| 1255 | if (continue_hostname == NULL |
| 1256 | #ifdef SUPPORT_TLS |
| 1257 | || tls_out.active >= 0 |
| 1258 | #endif |
| 1259 | ) |
| 1260 | { |
| 1261 | int require_auth; |
| 1262 | uschar *fail_reason = US"server did not advertise AUTH support"; |
| 1263 | |
| 1264 | /* Set for IGNOREQUOTA if the response to LHLO specifies support and the |
| 1265 | lmtp_ignore_quota option was set. */ |
| 1266 | |
| 1267 | igquotstr = (lmtp && ob->lmtp_ignore_quota && |
| 1268 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, |
| 1269 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; |
| 1270 | |
| 1271 | /* If the response to EHLO specified support for the SIZE parameter, note |
| 1272 | this, provided size_addition is non-negative. */ |
| 1273 | |
| 1274 | smtp_use_size = esmtp && ob->size_addition >= 0 && |
| 1275 | pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0, |
| 1276 | PCRE_EOPT, NULL, 0) >= 0; |
| 1277 | |
| 1278 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched |
| 1279 | the current host, esmtp will be false, so PIPELINING can never be used. If |
| 1280 | the current host matches hosts_avoid_pipelining, don't do it. */ |
| 1281 | |
| 1282 | smtp_use_pipelining = esmtp && |
| 1283 | verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name, |
| 1284 | host->address, NULL) != OK && |
| 1285 | pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0, |
| 1286 | PCRE_EOPT, NULL, 0) >= 0; |
| 1287 | |
| 1288 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", |
| 1289 | smtp_use_pipelining? "" : "not "); |
| 1290 | |
| 1291 | #ifdef EXPERIMENTAL_PRDR |
| 1292 | prdr_offered = esmtp && |
| 1293 | pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0, |
| 1294 | PCRE_EOPT, NULL, 0) >= 0 && |
| 1295 | verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name, |
| 1296 | host->address, NULL) == OK; |
| 1297 | |
| 1298 | if (prdr_offered) |
| 1299 | {DEBUG(D_transport) debug_printf("PRDR usable\n");} |
| 1300 | #endif |
| 1301 | |
| 1302 | /* Note if the response to EHLO specifies support for the AUTH extension. |
| 1303 | If it has, check that this host is one we want to authenticate to, and do |
| 1304 | the business. The host name and address must be available when the |
| 1305 | authenticator's client driver is running. */ |
| 1306 | |
| 1307 | smtp_authenticated = FALSE; |
| 1308 | client_authenticator = client_authenticated_id = client_authenticated_sender = NULL; |
| 1309 | require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL, |
| 1310 | host->name, host->address, NULL); |
| 1311 | |
| 1312 | if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1)) |
| 1313 | { |
| 1314 | uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]); |
| 1315 | expand_nmax = -1; /* reset */ |
| 1316 | |
| 1317 | /* Must not do this check until after we have saved the result of the |
| 1318 | regex match above. */ |
| 1319 | |
| 1320 | if (require_auth == OK || |
| 1321 | verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name, |
| 1322 | host->address, NULL) == OK) |
| 1323 | { |
| 1324 | auth_instance *au; |
| 1325 | fail_reason = US"no common mechanisms were found"; |
| 1326 | |
| 1327 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); |
| 1328 | |
| 1329 | /* Scan the configured authenticators looking for one which is configured |
| 1330 | for use as a client, which is not suppressed by client_condition, and |
| 1331 | whose name matches an authentication mechanism supported by the server. |
| 1332 | If one is found, attempt to authenticate by calling its client function. |
| 1333 | */ |
| 1334 | |
| 1335 | for (au = auths; !smtp_authenticated && au != NULL; au = au->next) |
| 1336 | { |
| 1337 | uschar *p = names; |
| 1338 | if (!au->client || |
| 1339 | (au->client_condition != NULL && |
| 1340 | !expand_check_condition(au->client_condition, au->name, |
| 1341 | US"client authenticator"))) |
| 1342 | { |
| 1343 | DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n", |
| 1344 | au->name, |
| 1345 | (au->client)? "client_condition is false" : |
| 1346 | "not configured as a client"); |
| 1347 | continue; |
| 1348 | } |
| 1349 | |
| 1350 | /* Loop to scan supported server mechanisms */ |
| 1351 | |
| 1352 | while (*p != 0) |
| 1353 | { |
| 1354 | int rc; |
| 1355 | int len = Ustrlen(au->public_name); |
| 1356 | while (isspace(*p)) p++; |
| 1357 | |
| 1358 | if (strncmpic(au->public_name, p, len) != 0 || |
| 1359 | (p[len] != 0 && !isspace(p[len]))) |
| 1360 | { |
| 1361 | while (*p != 0 && !isspace(*p)) p++; |
| 1362 | continue; |
| 1363 | } |
| 1364 | |
| 1365 | /* Found data for a listed mechanism. Call its client entry. Set |
| 1366 | a flag in the outblock so that data is overwritten after sending so |
| 1367 | that reflections don't show it. */ |
| 1368 | |
| 1369 | fail_reason = US"authentication attempt(s) failed"; |
| 1370 | outblock.authenticating = TRUE; |
| 1371 | rc = (au->info->clientcode)(au, &inblock, &outblock, |
| 1372 | ob->command_timeout, buffer, sizeof(buffer)); |
| 1373 | outblock.authenticating = FALSE; |
| 1374 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", |
| 1375 | au->name, rc); |
| 1376 | |
| 1377 | /* A temporary authentication failure must hold up delivery to |
| 1378 | this host. After a permanent authentication failure, we carry on |
| 1379 | to try other authentication methods. If all fail hard, try to |
| 1380 | deliver the message unauthenticated unless require_auth was set. */ |
| 1381 | |
| 1382 | switch(rc) |
| 1383 | { |
| 1384 | case OK: |
| 1385 | smtp_authenticated = TRUE; /* stops the outer loop */ |
| 1386 | client_authenticator = au->name; |
| 1387 | if (au->set_client_id != NULL) |
| 1388 | client_authenticated_id = expand_string(au->set_client_id); |
| 1389 | break; |
| 1390 | |
| 1391 | /* Failure after writing a command */ |
| 1392 | |
| 1393 | case FAIL_SEND: |
| 1394 | goto SEND_FAILED; |
| 1395 | |
| 1396 | /* Failure after reading a response */ |
| 1397 | |
| 1398 | case FAIL: |
| 1399 | if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED; |
| 1400 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", |
| 1401 | au->name, host->name, host->address, buffer); |
| 1402 | break; |
| 1403 | |
| 1404 | /* Failure by some other means. In effect, the authenticator |
| 1405 | decided it wasn't prepared to handle this case. Typically this |
| 1406 | is the result of "fail" in an expansion string. Do we need to |
| 1407 | log anything here? Feb 2006: a message is now put in the buffer |
| 1408 | if logging is required. */ |
| 1409 | |
| 1410 | case CANCELLED: |
| 1411 | if (*buffer != 0) |
| 1412 | log_write(0, LOG_MAIN, "%s authenticator cancelled " |
| 1413 | "authentication H=%s [%s] %s", au->name, host->name, |
| 1414 | host->address, buffer); |
| 1415 | break; |
| 1416 | |
| 1417 | /* Internal problem, message in buffer. */ |
| 1418 | |
| 1419 | case ERROR: |
| 1420 | yield = ERROR; |
| 1421 | set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE); |
| 1422 | goto SEND_QUIT; |
| 1423 | } |
| 1424 | |
| 1425 | break; /* If not authenticated, try next authenticator */ |
| 1426 | } /* Loop for scanning supported server mechanisms */ |
| 1427 | } /* Loop for further authenticators */ |
| 1428 | } |
| 1429 | } |
| 1430 | |
| 1431 | /* If we haven't authenticated, but are required to, give up. */ |
| 1432 | |
| 1433 | if (require_auth == OK && !smtp_authenticated) |
| 1434 | { |
| 1435 | yield = DEFER; |
| 1436 | set_errno(addrlist, ERRNO_AUTHFAIL, |
| 1437 | string_sprintf("authentication required but %s", fail_reason), DEFER, |
| 1438 | FALSE); |
| 1439 | goto SEND_QUIT; |
| 1440 | } |
| 1441 | } |
| 1442 | |
| 1443 | /* The setting up of the SMTP call is now complete. Any subsequent errors are |
| 1444 | message-specific. */ |
| 1445 | |
| 1446 | setting_up = FALSE; |
| 1447 | |
| 1448 | /* If there is a filter command specified for this transport, we can now |
| 1449 | set it up. This cannot be done until the identify of the host is known. */ |
| 1450 | |
| 1451 | if (tblock->filter_command != NULL) |
| 1452 | { |
| 1453 | BOOL rc; |
| 1454 | uschar buffer[64]; |
| 1455 | sprintf(CS buffer, "%.50s transport", tblock->name); |
| 1456 | rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command, |
| 1457 | TRUE, DEFER, addrlist, buffer, NULL); |
| 1458 | transport_filter_timeout = tblock->filter_timeout; |
| 1459 | |
| 1460 | /* On failure, copy the error to all addresses, abandon the SMTP call, and |
| 1461 | yield ERROR. */ |
| 1462 | |
| 1463 | if (!rc) |
| 1464 | { |
| 1465 | set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER, |
| 1466 | FALSE); |
| 1467 | yield = ERROR; |
| 1468 | goto SEND_QUIT; |
| 1469 | } |
| 1470 | } |
| 1471 | |
| 1472 | |
| 1473 | /* For messages that have more than the maximum number of envelope recipients, |
| 1474 | we want to send several transactions down the same SMTP connection. (See |
| 1475 | comments in deliver.c as to how this reconciles, heuristically, with |
| 1476 | remote_max_parallel.) This optimization was added to Exim after the following |
| 1477 | code was already working. The simplest way to put it in without disturbing the |
| 1478 | code was to use a goto to jump back to this point when there is another |
| 1479 | transaction to handle. */ |
| 1480 | |
| 1481 | SEND_MESSAGE: |
| 1482 | sync_addr = first_addr; |
| 1483 | address_count = 0; |
| 1484 | ok = FALSE; |
| 1485 | send_rset = TRUE; |
| 1486 | completed_address = FALSE; |
| 1487 | |
| 1488 | |
| 1489 | /* Initiate a message transfer. If we know the receiving MTA supports the SIZE |
| 1490 | qualification, send it, adding something to the message size to allow for |
| 1491 | imprecision and things that get added en route. Exim keeps the number of lines |
| 1492 | in a message, so we can give an accurate value for the original message, but we |
| 1493 | need some additional to handle added headers. (Double "." characters don't get |
| 1494 | included in the count.) */ |
| 1495 | |
| 1496 | p = buffer; |
| 1497 | *p = 0; |
| 1498 | |
| 1499 | if (smtp_use_size) |
| 1500 | { |
| 1501 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition); |
| 1502 | while (*p) p++; |
| 1503 | } |
| 1504 | |
| 1505 | #ifdef EXPERIMENTAL_PRDR |
| 1506 | prdr_active = FALSE; |
| 1507 | if (prdr_offered) |
| 1508 | { |
| 1509 | for (addr = first_addr; addr; addr = addr->next) |
| 1510 | if (addr->transport_return == PENDING_DEFER) |
| 1511 | { |
| 1512 | for (addr = addr->next; addr; addr = addr->next) |
| 1513 | if (addr->transport_return == PENDING_DEFER) |
| 1514 | { /* at least two recipients to send */ |
| 1515 | prdr_active = TRUE; |
| 1516 | sprintf(CS p, " PRDR"); p += 5; |
| 1517 | goto prdr_is_active; |
| 1518 | } |
| 1519 | break; |
| 1520 | } |
| 1521 | } |
| 1522 | prdr_is_active: |
| 1523 | #endif |
| 1524 | |
| 1525 | /* If an authenticated_sender override has been specified for this transport |
| 1526 | instance, expand it. If the expansion is forced to fail, and there was already |
| 1527 | an authenticated_sender for this message, the original value will be used. |
| 1528 | Other expansion failures are serious. An empty result is ignored, but there is |
| 1529 | otherwise no check - this feature is expected to be used with LMTP and other |
| 1530 | cases where non-standard addresses (e.g. without domains) might be required. */ |
| 1531 | |
| 1532 | if (ob->authenticated_sender != NULL) |
| 1533 | { |
| 1534 | uschar *new = expand_string(ob->authenticated_sender); |
| 1535 | if (new == NULL) |
| 1536 | { |
| 1537 | if (!expand_string_forcedfail) |
| 1538 | { |
| 1539 | uschar *message = string_sprintf("failed to expand " |
| 1540 | "authenticated_sender: %s", expand_string_message); |
| 1541 | set_errno(addrlist, 0, message, DEFER, FALSE); |
| 1542 | return ERROR; |
| 1543 | } |
| 1544 | } |
| 1545 | else if (new[0] != 0) local_authenticated_sender = new; |
| 1546 | } |
| 1547 | |
| 1548 | /* Add the authenticated sender address if present */ |
| 1549 | |
| 1550 | if ((smtp_authenticated || ob->authenticated_sender_force) && |
| 1551 | local_authenticated_sender != NULL) |
| 1552 | { |
| 1553 | string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s", |
| 1554 | auth_xtextencode(local_authenticated_sender, |
| 1555 | Ustrlen(local_authenticated_sender))); |
| 1556 | client_authenticated_sender = string_copy(local_authenticated_sender); |
| 1557 | } |
| 1558 | |
| 1559 | /* From here until we send the DATA command, we can make use of PIPELINING |
| 1560 | if the server host supports it. The code has to be able to check the responses |
| 1561 | at any point, for when the buffer fills up, so we write it totally generally. |
| 1562 | When PIPELINING is off, each command written reports that it has flushed the |
| 1563 | buffer. */ |
| 1564 | |
| 1565 | pending_MAIL = TRUE; /* The block starts with MAIL */ |
| 1566 | |
| 1567 | rc = smtp_write_command(&outblock, smtp_use_pipelining, |
| 1568 | "MAIL FROM:<%s>%s\r\n", return_path, buffer); |
| 1569 | mail_command = string_copy(big_buffer); /* Save for later error message */ |
| 1570 | |
| 1571 | switch(rc) |
| 1572 | { |
| 1573 | case -1: /* Transmission error */ |
| 1574 | goto SEND_FAILED; |
| 1575 | |
| 1576 | case +1: /* Block was sent */ |
| 1577 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1578 | ob->command_timeout)) |
| 1579 | { |
| 1580 | if (errno == 0 && buffer[0] == '4') |
| 1581 | { |
| 1582 | errno = ERRNO_MAIL4XX; |
| 1583 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 1584 | } |
| 1585 | goto RESPONSE_FAILED; |
| 1586 | } |
| 1587 | pending_MAIL = FALSE; |
| 1588 | break; |
| 1589 | } |
| 1590 | |
| 1591 | /* Pass over all the relevant recipient addresses for this host, which are the |
| 1592 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send |
| 1593 | several before we have to read the responses for those seen so far. This |
| 1594 | checking is done by a subroutine because it also needs to be done at the end. |
| 1595 | Send only up to max_rcpt addresses at a time, leaving first_addr pointing to |
| 1596 | the next one if not all are sent. |
| 1597 | |
| 1598 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the |
| 1599 | last address because we want to abort if any recipients have any kind of |
| 1600 | problem, temporary or permanent. We know that all recipient addresses will have |
| 1601 | the PENDING_DEFER status, because only one attempt is ever made, and we know |
| 1602 | that max_rcpt will be large, so all addresses will be done at once. */ |
| 1603 | |
| 1604 | for (addr = first_addr; |
| 1605 | address_count < max_rcpt && addr != NULL; |
| 1606 | addr = addr->next) |
| 1607 | { |
| 1608 | int count; |
| 1609 | BOOL no_flush; |
| 1610 | |
| 1611 | if (addr->transport_return != PENDING_DEFER) continue; |
| 1612 | |
| 1613 | address_count++; |
| 1614 | no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL); |
| 1615 | |
| 1616 | /* Now send the RCPT command, and process outstanding responses when |
| 1617 | necessary. After a timeout on RCPT, we just end the function, leaving the |
| 1618 | yield as OK, because this error can often mean that there is a problem with |
| 1619 | just one address, so we don't want to delay the host. */ |
| 1620 | |
| 1621 | count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n", |
| 1622 | transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr); |
| 1623 | if (count < 0) goto SEND_FAILED; |
| 1624 | if (count > 0) |
| 1625 | { |
| 1626 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, |
| 1627 | &sync_addr, host, count, ob->address_retry_include_sender, |
| 1628 | pending_MAIL, 0, &inblock, ob->command_timeout, buffer, |
| 1629 | sizeof(buffer))) |
| 1630 | { |
| 1631 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 1632 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ |
| 1633 | break; |
| 1634 | |
| 1635 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 1636 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ |
| 1637 | case 0: /* No 2xx or 5xx, but no probs */ |
| 1638 | break; |
| 1639 | |
| 1640 | case -1: goto END_OFF; /* Timeout on RCPT */ |
| 1641 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */ |
| 1642 | } |
| 1643 | pending_MAIL = FALSE; /* Dealt with MAIL */ |
| 1644 | } |
| 1645 | } /* Loop for next address */ |
| 1646 | |
| 1647 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either |
| 1648 | permanently or temporarily. We should have flushed and synced after the last |
| 1649 | RCPT. */ |
| 1650 | |
| 1651 | if (mua_wrapper) |
| 1652 | { |
| 1653 | address_item *badaddr; |
| 1654 | for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next) |
| 1655 | { |
| 1656 | if (badaddr->transport_return != PENDING_OK) break; |
| 1657 | } |
| 1658 | if (badaddr != NULL) |
| 1659 | { |
| 1660 | set_errno(addrlist, 0, badaddr->message, FAIL, |
| 1661 | testflag(badaddr, af_pass_message)); |
| 1662 | ok = FALSE; |
| 1663 | } |
| 1664 | } |
| 1665 | |
| 1666 | /* If ok is TRUE, we know we have got at least one good recipient, and must now |
| 1667 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still |
| 1668 | have a good recipient buffered up if we are pipelining. We don't want to waste |
| 1669 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we |
| 1670 | are pipelining. The responses are all handled by sync_responses(). */ |
| 1671 | |
| 1672 | if (ok || (smtp_use_pipelining && !mua_wrapper)) |
| 1673 | { |
| 1674 | int count = smtp_write_command(&outblock, FALSE, "DATA\r\n"); |
| 1675 | if (count < 0) goto SEND_FAILED; |
| 1676 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr, |
| 1677 | host, count, ob->address_retry_include_sender, pending_MAIL, |
| 1678 | ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer))) |
| 1679 | { |
| 1680 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 1681 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ |
| 1682 | break; |
| 1683 | |
| 1684 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 1685 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ |
| 1686 | case 0: break; /* No 2xx or 5xx, but no probs */ |
| 1687 | |
| 1688 | case -1: goto END_OFF; /* Timeout on RCPT */ |
| 1689 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ |
| 1690 | } |
| 1691 | } |
| 1692 | |
| 1693 | /* Save the first address of the next batch. */ |
| 1694 | |
| 1695 | first_addr = addr; |
| 1696 | |
| 1697 | /* If there were no good recipients (but otherwise there have been no |
| 1698 | problems), just set ok TRUE, since we have handled address-specific errors |
| 1699 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism |
| 1700 | for handling the SMTP dot-handling protocol, flagging to apply to headers as |
| 1701 | well as body. Set the appropriate timeout value to be used for each chunk. |
| 1702 | (Haven't been able to make it work using select() for writing yet.) */ |
| 1703 | |
| 1704 | if (!ok) ok = TRUE; else |
| 1705 | { |
| 1706 | sigalrm_seen = FALSE; |
| 1707 | transport_write_timeout = ob->data_timeout; |
| 1708 | smtp_command = US"sending data block"; /* For error messages */ |
| 1709 | DEBUG(D_transport|D_v) |
| 1710 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); |
| 1711 | transport_count = 0; |
| 1712 | #ifndef DISABLE_DKIM |
| 1713 | ok = dkim_transport_write_message(addrlist, inblock.sock, |
| 1714 | topt_use_crlf | topt_end_dot | topt_escape_headers | |
| 1715 | (tblock->body_only? topt_no_headers : 0) | |
| 1716 | (tblock->headers_only? topt_no_body : 0) | |
| 1717 | (tblock->return_path_add? topt_add_return_path : 0) | |
| 1718 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | |
| 1719 | (tblock->envelope_to_add? topt_add_envelope_to : 0), |
| 1720 | 0, /* No size limit */ |
| 1721 | tblock->add_headers, tblock->remove_headers, |
| 1722 | US".", US"..", /* Escaping strings */ |
| 1723 | tblock->rewrite_rules, tblock->rewrite_existflags, |
| 1724 | ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector, |
| 1725 | ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers |
| 1726 | ); |
| 1727 | #else |
| 1728 | ok = transport_write_message(addrlist, inblock.sock, |
| 1729 | topt_use_crlf | topt_end_dot | topt_escape_headers | |
| 1730 | (tblock->body_only? topt_no_headers : 0) | |
| 1731 | (tblock->headers_only? topt_no_body : 0) | |
| 1732 | (tblock->return_path_add? topt_add_return_path : 0) | |
| 1733 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | |
| 1734 | (tblock->envelope_to_add? topt_add_envelope_to : 0), |
| 1735 | 0, /* No size limit */ |
| 1736 | tblock->add_headers, tblock->remove_headers, |
| 1737 | US".", US"..", /* Escaping strings */ |
| 1738 | tblock->rewrite_rules, tblock->rewrite_existflags); |
| 1739 | #endif |
| 1740 | |
| 1741 | /* transport_write_message() uses write() because it is called from other |
| 1742 | places to write to non-sockets. This means that under some OS (e.g. Solaris) |
| 1743 | it can exit with "Broken pipe" as its error. This really means that the |
| 1744 | socket got closed at the far end. */ |
| 1745 | |
| 1746 | transport_write_timeout = 0; /* for subsequent transports */ |
| 1747 | |
| 1748 | /* Failure can either be some kind of I/O disaster (including timeout), |
| 1749 | or the failure of a transport filter or the expansion of added headers. */ |
| 1750 | |
| 1751 | if (!ok) |
| 1752 | { |
| 1753 | buffer[0] = 0; /* There hasn't been a response */ |
| 1754 | goto RESPONSE_FAILED; |
| 1755 | } |
| 1756 | |
| 1757 | /* We used to send the terminating "." explicitly here, but because of |
| 1758 | buffering effects at both ends of TCP/IP connections, you don't gain |
| 1759 | anything by keeping it separate, so it might as well go in the final |
| 1760 | data buffer for efficiency. This is now done by setting the topt_end_dot |
| 1761 | flag above. */ |
| 1762 | |
| 1763 | smtp_command = US"end of data"; |
| 1764 | |
| 1765 | #ifdef EXPERIMENTAL_PRDR |
| 1766 | /* For PRDR we optionally get a partial-responses warning |
| 1767 | * followed by the individual responses, before going on with |
| 1768 | * the overall response. If we don't get the warning then deal |
| 1769 | * with per non-PRDR. */ |
| 1770 | if(prdr_active) |
| 1771 | { |
| 1772 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3', |
| 1773 | ob->final_timeout); |
| 1774 | if (!ok && errno == 0) |
| 1775 | switch(buffer[0]) |
| 1776 | { |
| 1777 | case '2': prdr_active = FALSE; |
| 1778 | ok = TRUE; |
| 1779 | break; |
| 1780 | case '4': errno = ERRNO_DATA4XX; |
| 1781 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 1782 | break; |
| 1783 | } |
| 1784 | } |
| 1785 | else |
| 1786 | #endif |
| 1787 | |
| 1788 | /* For non-PRDR SMTP, we now read a single response that applies to the |
| 1789 | whole message. If it is OK, then all the addresses have been delivered. */ |
| 1790 | |
| 1791 | if (!lmtp) |
| 1792 | { |
| 1793 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1794 | ob->final_timeout); |
| 1795 | if (!ok && errno == 0 && buffer[0] == '4') |
| 1796 | { |
| 1797 | errno = ERRNO_DATA4XX; |
| 1798 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 1799 | } |
| 1800 | } |
| 1801 | |
| 1802 | /* For LMTP, we get back a response for every RCPT command that we sent; |
| 1803 | some may be accepted and some rejected. For those that get a response, their |
| 1804 | status is fixed; any that are accepted have been handed over, even if later |
| 1805 | responses crash - at least, that's how I read RFC 2033. |
| 1806 | |
| 1807 | If all went well, mark the recipient addresses as completed, record which |
| 1808 | host/IPaddress they were delivered to, and cut out RSET when sending another |
| 1809 | message down the same channel. Write the completed addresses to the journal |
| 1810 | now so that they are recorded in case there is a crash of hardware or |
| 1811 | software before the spool gets updated. Also record the final SMTP |
| 1812 | confirmation if needed (for SMTP only). */ |
| 1813 | |
| 1814 | if (ok) |
| 1815 | { |
| 1816 | int flag = '='; |
| 1817 | int delivery_time = (int)(time(NULL) - start_delivery_time); |
| 1818 | int len; |
| 1819 | host_item *thost; |
| 1820 | uschar *conf = NULL; |
| 1821 | send_rset = FALSE; |
| 1822 | |
| 1823 | /* Make a copy of the host if it is local to this invocation |
| 1824 | of the transport. */ |
| 1825 | |
| 1826 | if (copy_host) |
| 1827 | { |
| 1828 | thost = store_get(sizeof(host_item)); |
| 1829 | *thost = *host; |
| 1830 | thost->name = string_copy(host->name); |
| 1831 | thost->address = string_copy(host->address); |
| 1832 | } |
| 1833 | else thost = host; |
| 1834 | |
| 1835 | /* Set up confirmation if needed - applies only to SMTP */ |
| 1836 | |
| 1837 | if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp) |
| 1838 | { |
| 1839 | uschar *s = string_printing(buffer); |
| 1840 | conf = (s == buffer)? (uschar *)string_copy(s) : s; |
| 1841 | } |
| 1842 | |
| 1843 | /* Process all transported addresses - for LMTP or PRDR, read a status for |
| 1844 | each one. */ |
| 1845 | |
| 1846 | for (addr = addrlist; addr != first_addr; addr = addr->next) |
| 1847 | { |
| 1848 | if (addr->transport_return != PENDING_OK) continue; |
| 1849 | |
| 1850 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the |
| 1851 | remaining addresses. Otherwise, it's a return code for just the one |
| 1852 | address. For temporary errors, add a retry item for the address so that |
| 1853 | it doesn't get tried again too soon. */ |
| 1854 | |
| 1855 | #ifdef EXPERIMENTAL_PRDR |
| 1856 | if (lmtp || prdr_active) |
| 1857 | #else |
| 1858 | if (lmtp) |
| 1859 | #endif |
| 1860 | { |
| 1861 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1862 | ob->final_timeout)) |
| 1863 | { |
| 1864 | if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED; |
| 1865 | addr->message = string_sprintf( |
| 1866 | #ifdef EXPERIMENTAL_PRDR |
| 1867 | "%s error after %s: %s", prdr_active ? "PRDR":"LMTP", |
| 1868 | #else |
| 1869 | "LMTP error after %s: %s", |
| 1870 | #endif |
| 1871 | big_buffer, string_printing(buffer)); |
| 1872 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
| 1873 | if (buffer[0] == '5') |
| 1874 | addr->transport_return = FAIL; |
| 1875 | else |
| 1876 | { |
| 1877 | errno = ERRNO_DATA4XX; |
| 1878 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 1879 | addr->transport_return = DEFER; |
| 1880 | #ifdef EXPERIMENTAL_PRDR |
| 1881 | if (!prdr_active) |
| 1882 | #endif |
| 1883 | retry_add_item(addr, addr->address_retry_key, 0); |
| 1884 | } |
| 1885 | continue; |
| 1886 | } |
| 1887 | completed_address = TRUE; /* NOW we can set this flag */ |
| 1888 | if ((log_extra_selector & LX_smtp_confirmation) != 0) |
| 1889 | { |
| 1890 | uschar *s = string_printing(buffer); |
| 1891 | conf = (s == buffer)? (uschar *)string_copy(s) : s; |
| 1892 | } |
| 1893 | } |
| 1894 | |
| 1895 | /* SMTP, or success return from LMTP for this address. Pass back the |
| 1896 | actual host that was used. */ |
| 1897 | |
| 1898 | addr->transport_return = OK; |
| 1899 | addr->more_errno = delivery_time; |
| 1900 | addr->host_used = thost; |
| 1901 | addr->special_action = flag; |
| 1902 | addr->message = conf; |
| 1903 | #ifdef EXPERIMENTAL_PRDR |
| 1904 | if (prdr_active) addr->flags |= af_prdr_used; |
| 1905 | #endif |
| 1906 | flag = '-'; |
| 1907 | |
| 1908 | #ifdef EXPERIMENTAL_PRDR |
| 1909 | if (!prdr_active) |
| 1910 | #endif |
| 1911 | { |
| 1912 | /* Update the journal. For homonymic addresses, use the base address plus |
| 1913 | the transport name. See lots of comments in deliver.c about the reasons |
| 1914 | for the complications when homonyms are involved. Just carry on after |
| 1915 | write error, as it may prove possible to update the spool file later. */ |
| 1916 | |
| 1917 | if (testflag(addr, af_homonym)) |
| 1918 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); |
| 1919 | else |
| 1920 | sprintf(CS buffer, "%.500s\n", addr->unique); |
| 1921 | |
| 1922 | DEBUG(D_deliver) debug_printf("journalling %s", buffer); |
| 1923 | len = Ustrlen(CS buffer); |
| 1924 | if (write(journal_fd, buffer, len) != len) |
| 1925 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " |
| 1926 | "%s: %s", buffer, strerror(errno)); |
| 1927 | } |
| 1928 | } |
| 1929 | |
| 1930 | #ifdef EXPERIMENTAL_PRDR |
| 1931 | if (prdr_active) |
| 1932 | { |
| 1933 | /* PRDR - get the final, overall response. For any non-success |
| 1934 | upgrade all the address statuses. */ |
| 1935 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1936 | ob->final_timeout); |
| 1937 | if (!ok) |
| 1938 | { |
| 1939 | if(errno == 0 && buffer[0] == '4') |
| 1940 | { |
| 1941 | errno = ERRNO_DATA4XX; |
| 1942 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 1943 | } |
| 1944 | for (addr = addrlist; addr != first_addr; addr = addr->next) |
| 1945 | if (buffer[0] == '5' || addr->transport_return == OK) |
| 1946 | addr->transport_return = PENDING_OK; /* allow set_errno action */ |
| 1947 | goto RESPONSE_FAILED; |
| 1948 | } |
| 1949 | |
| 1950 | /* Update the journal, or setup retry. */ |
| 1951 | for (addr = addrlist; addr != first_addr; addr = addr->next) |
| 1952 | if (addr->transport_return == OK) |
| 1953 | { |
| 1954 | if (testflag(addr, af_homonym)) |
| 1955 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); |
| 1956 | else |
| 1957 | sprintf(CS buffer, "%.500s\n", addr->unique); |
| 1958 | |
| 1959 | DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer); |
| 1960 | len = Ustrlen(CS buffer); |
| 1961 | if (write(journal_fd, buffer, len) != len) |
| 1962 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " |
| 1963 | "%s: %s", buffer, strerror(errno)); |
| 1964 | } |
| 1965 | else if (addr->transport_return == DEFER) |
| 1966 | retry_add_item(addr, addr->address_retry_key, -2); |
| 1967 | } |
| 1968 | #endif |
| 1969 | |
| 1970 | /* Ensure the journal file is pushed out to disk. */ |
| 1971 | |
| 1972 | if (EXIMfsync(journal_fd) < 0) |
| 1973 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", |
| 1974 | strerror(errno)); |
| 1975 | } |
| 1976 | } |
| 1977 | |
| 1978 | |
| 1979 | /* Handle general (not specific to one address) failures here. The value of ok |
| 1980 | is used to skip over this code on the falling through case. A timeout causes a |
| 1981 | deferral. Other errors may defer or fail according to the response code, and |
| 1982 | may set up a special errno value, e.g. after connection chopped, which is |
| 1983 | assumed if errno == 0 and there is no text in the buffer. If control reaches |
| 1984 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as |
| 1985 | the problem is not related to this specific message. */ |
| 1986 | |
| 1987 | if (!ok) |
| 1988 | { |
| 1989 | int code; |
| 1990 | |
| 1991 | RESPONSE_FAILED: |
| 1992 | save_errno = errno; |
| 1993 | message = NULL; |
| 1994 | send_quit = check_response(host, &save_errno, addrlist->more_errno, |
| 1995 | buffer, &code, &message, &pass_message); |
| 1996 | goto FAILED; |
| 1997 | |
| 1998 | SEND_FAILED: |
| 1999 | save_errno = errno; |
| 2000 | code = '4'; |
| 2001 | message = US string_sprintf("send() to %s [%s] failed: %s", |
| 2002 | host->name, host->address, strerror(save_errno)); |
| 2003 | send_quit = FALSE; |
| 2004 | goto FAILED; |
| 2005 | |
| 2006 | /* This label is jumped to directly when a TLS negotiation has failed, |
| 2007 | or was not done for a host for which it is required. Values will be set |
| 2008 | in message and save_errno, and setting_up will always be true. Treat as |
| 2009 | a temporary error. */ |
| 2010 | |
| 2011 | #ifdef SUPPORT_TLS |
| 2012 | TLS_FAILED: |
| 2013 | code = '4'; |
| 2014 | #endif |
| 2015 | |
| 2016 | /* If the failure happened while setting up the call, see if the failure was |
| 2017 | a 5xx response (this will either be on connection, or following HELO - a 5xx |
| 2018 | after EHLO causes it to try HELO). If so, fail all addresses, as this host is |
| 2019 | never going to accept them. For other errors during setting up (timeouts or |
| 2020 | whatever), defer all addresses, and yield DEFER, so that the host is not |
| 2021 | tried again for a while. */ |
| 2022 | |
| 2023 | FAILED: |
| 2024 | ok = FALSE; /* For when reached by GOTO */ |
| 2025 | |
| 2026 | if (setting_up) |
| 2027 | { |
| 2028 | if (code == '5') |
| 2029 | { |
| 2030 | set_errno(addrlist, save_errno, message, FAIL, pass_message); |
| 2031 | } |
| 2032 | else |
| 2033 | { |
| 2034 | set_errno(addrlist, save_errno, message, DEFER, pass_message); |
| 2035 | yield = DEFER; |
| 2036 | } |
| 2037 | } |
| 2038 | |
| 2039 | /* We want to handle timeouts after MAIL or "." and loss of connection after |
| 2040 | "." specially. They can indicate a problem with the sender address or with |
| 2041 | the contents of the message rather than a real error on the connection. These |
| 2042 | cases are treated in the same way as a 4xx response. This next bit of code |
| 2043 | does the classification. */ |
| 2044 | |
| 2045 | else |
| 2046 | { |
| 2047 | BOOL message_error; |
| 2048 | |
| 2049 | switch(save_errno) |
| 2050 | { |
| 2051 | case 0: |
| 2052 | case ERRNO_MAIL4XX: |
| 2053 | case ERRNO_DATA4XX: |
| 2054 | message_error = TRUE; |
| 2055 | break; |
| 2056 | |
| 2057 | case ETIMEDOUT: |
| 2058 | message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 || |
| 2059 | Ustrncmp(smtp_command,"end ",4) == 0; |
| 2060 | break; |
| 2061 | |
| 2062 | case ERRNO_SMTPCLOSED: |
| 2063 | message_error = Ustrncmp(smtp_command,"end ",4) == 0; |
| 2064 | break; |
| 2065 | |
| 2066 | default: |
| 2067 | message_error = FALSE; |
| 2068 | break; |
| 2069 | } |
| 2070 | |
| 2071 | /* Handle the cases that are treated as message errors. These are: |
| 2072 | |
| 2073 | (a) negative response or timeout after MAIL |
| 2074 | (b) negative response after DATA |
| 2075 | (c) negative response or timeout or dropped connection after "." |
| 2076 | |
| 2077 | It won't be a negative response or timeout after RCPT, as that is dealt |
| 2078 | with separately above. The action in all cases is to set an appropriate |
| 2079 | error code for all the addresses, but to leave yield set to OK because the |
| 2080 | host itself has not failed. Of course, it might in practice have failed |
| 2081 | when we've had a timeout, but if so, we'll discover that at the next |
| 2082 | delivery attempt. For a temporary error, set the message_defer flag, and |
| 2083 | write to the logs for information if this is not the last host. The error |
| 2084 | for the last host will be logged as part of the address's log line. */ |
| 2085 | |
| 2086 | if (message_error) |
| 2087 | { |
| 2088 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ |
| 2089 | set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER, |
| 2090 | pass_message); |
| 2091 | |
| 2092 | /* If there's an errno, the message contains just the identity of |
| 2093 | the host. */ |
| 2094 | |
| 2095 | if (code != '5') /* Anything other than 5 is treated as temporary */ |
| 2096 | { |
| 2097 | if (save_errno > 0) |
| 2098 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); |
| 2099 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message); |
| 2100 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); |
| 2101 | *message_defer = TRUE; |
| 2102 | } |
| 2103 | } |
| 2104 | |
| 2105 | /* Otherwise, we have an I/O error or a timeout other than after MAIL or |
| 2106 | ".", or some other transportation error. We defer all addresses and yield |
| 2107 | DEFER, except for the case of failed add_headers expansion, or a transport |
| 2108 | filter failure, when the yield should be ERROR, to stop it trying other |
| 2109 | hosts. */ |
| 2110 | |
| 2111 | else |
| 2112 | { |
| 2113 | yield = (save_errno == ERRNO_CHHEADER_FAIL || |
| 2114 | save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER; |
| 2115 | set_errno(addrlist, save_errno, message, DEFER, pass_message); |
| 2116 | } |
| 2117 | } |
| 2118 | } |
| 2119 | |
| 2120 | |
| 2121 | /* If all has gone well, send_quit will be set TRUE, implying we can end the |
| 2122 | SMTP session tidily. However, if there were too many addresses to send in one |
| 2123 | message (indicated by first_addr being non-NULL) we want to carry on with the |
| 2124 | rest of them. Also, it is desirable to send more than one message down the SMTP |
| 2125 | connection if there are several waiting, provided we haven't already sent so |
| 2126 | many as to hit the configured limit. The function transport_check_waiting looks |
| 2127 | for a waiting message and returns its id. Then transport_pass_socket tries to |
| 2128 | set up a continued delivery by passing the socket on to another process. The |
| 2129 | variable send_rset is FALSE if a message has just been successfully transfered. |
| 2130 | |
| 2131 | If we are already sending down a continued channel, there may be further |
| 2132 | addresses not yet delivered that are aimed at the same host, but which have not |
| 2133 | been passed in this run of the transport. In this case, continue_more will be |
| 2134 | true, and all we should do is send RSET if necessary, and return, leaving the |
| 2135 | channel open. |
| 2136 | |
| 2137 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we |
| 2138 | do not want to continue with other messages down the same channel, because that |
| 2139 | can lead to looping between two or more messages, all with the same, |
| 2140 | temporarily failing address(es). [The retry information isn't updated yet, so |
| 2141 | new processes keep on trying.] We probably also don't want to try more of this |
| 2142 | message's addresses either. |
| 2143 | |
| 2144 | If we have started a TLS session, we have to end it before passing the |
| 2145 | connection to a new process. However, not all servers can handle this (Exim |
| 2146 | can), so we do not pass such a connection on if the host matches |
| 2147 | hosts_nopass_tls. */ |
| 2148 | |
| 2149 | DEBUG(D_transport) |
| 2150 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " |
| 2151 | "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset, |
| 2152 | continue_more, yield, (first_addr == NULL)? "":"not "); |
| 2153 | |
| 2154 | if (completed_address && ok && send_quit) |
| 2155 | { |
| 2156 | BOOL more; |
| 2157 | if (first_addr != NULL || continue_more || |
| 2158 | ( |
| 2159 | (tls_out.active < 0 || |
| 2160 | verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name, |
| 2161 | host->address, NULL) != OK) |
| 2162 | && |
| 2163 | transport_check_waiting(tblock->name, host->name, |
| 2164 | tblock->connection_max_messages, new_message_id, &more) |
| 2165 | )) |
| 2166 | { |
| 2167 | uschar *msg; |
| 2168 | BOOL pass_message; |
| 2169 | |
| 2170 | if (send_rset) |
| 2171 | { |
| 2172 | if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0)) |
| 2173 | { |
| 2174 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, |
| 2175 | host->address, strerror(save_errno)); |
| 2176 | send_quit = FALSE; |
| 2177 | } |
| 2178 | else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 2179 | ob->command_timeout))) |
| 2180 | { |
| 2181 | int code; |
| 2182 | send_quit = check_response(host, &errno, 0, buffer, &code, &msg, |
| 2183 | &pass_message); |
| 2184 | if (!send_quit) |
| 2185 | { |
| 2186 | DEBUG(D_transport) debug_printf("%s\n", msg); |
| 2187 | } |
| 2188 | } |
| 2189 | } |
| 2190 | |
| 2191 | /* Either RSET was not needed, or it succeeded */ |
| 2192 | |
| 2193 | if (ok) |
| 2194 | { |
| 2195 | if (first_addr != NULL) /* More addresses still to be sent */ |
| 2196 | { /* in this run of the transport */ |
| 2197 | continue_sequence++; /* Causes * in logging */ |
| 2198 | goto SEND_MESSAGE; |
| 2199 | } |
| 2200 | if (continue_more) return yield; /* More addresses for another run */ |
| 2201 | |
| 2202 | /* Pass the socket to a new Exim process. Before doing so, we must shut |
| 2203 | down TLS. Not all MTAs allow for the continuation of the SMTP session |
| 2204 | when TLS is shut down. We test for this by sending a new EHLO. If we |
| 2205 | don't get a good response, we don't attempt to pass the socket on. */ |
| 2206 | |
| 2207 | #ifdef SUPPORT_TLS |
| 2208 | if (tls_out.active >= 0) |
| 2209 | { |
| 2210 | tls_close(FALSE, TRUE); |
| 2211 | if (smtps) |
| 2212 | ok = FALSE; |
| 2213 | else |
| 2214 | ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 && |
| 2215 | smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 2216 | ob->command_timeout); |
| 2217 | } |
| 2218 | #endif |
| 2219 | |
| 2220 | /* If the socket is successfully passed, we musn't send QUIT (or |
| 2221 | indeed anything!) from here. */ |
| 2222 | |
| 2223 | if (ok && transport_pass_socket(tblock->name, host->name, host->address, |
| 2224 | new_message_id, inblock.sock)) |
| 2225 | { |
| 2226 | send_quit = FALSE; |
| 2227 | } |
| 2228 | } |
| 2229 | |
| 2230 | /* If RSET failed and there are addresses left, they get deferred. */ |
| 2231 | |
| 2232 | else set_errno(first_addr, errno, msg, DEFER, FALSE); |
| 2233 | } |
| 2234 | } |
| 2235 | |
| 2236 | /* End off tidily with QUIT unless the connection has died or the socket has |
| 2237 | been passed to another process. There has been discussion on the net about what |
| 2238 | to do after sending QUIT. The wording of the RFC suggests that it is necessary |
| 2239 | to wait for a response, but on the other hand, there isn't anything one can do |
| 2240 | with an error response, other than log it. Exim used to do that. However, |
| 2241 | further discussion suggested that it is positively advantageous not to wait for |
| 2242 | the response, but to close the session immediately. This is supposed to move |
| 2243 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some |
| 2244 | load from the server. (Hosts that are both servers and clients may not see much |
| 2245 | difference, of course.) Further discussion indicated that this was safe to do |
| 2246 | on Unix systems which have decent implementations of TCP/IP that leave the |
| 2247 | connection around for a while (TIME_WAIT) after the application has gone away. |
| 2248 | This enables the response sent by the server to be properly ACKed rather than |
| 2249 | timed out, as can happen on broken TCP/IP implementations on other OS. |
| 2250 | |
| 2251 | This change is being made on 31-Jul-98. After over a year of trouble-free |
| 2252 | operation, the old commented-out code was removed on 17-Sep-99. */ |
| 2253 | |
| 2254 | SEND_QUIT: |
| 2255 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); |
| 2256 | |
| 2257 | END_OFF: |
| 2258 | |
| 2259 | #ifdef SUPPORT_TLS |
| 2260 | tls_close(FALSE, TRUE); |
| 2261 | #endif |
| 2262 | |
| 2263 | /* Close the socket, and return the appropriate value, first setting |
| 2264 | continue_transport and continue_hostname NULL to prevent any other addresses |
| 2265 | that may include the host from trying to re-use a continuation socket. This |
| 2266 | works because the NULL setting is passed back to the calling process, and |
| 2267 | remote_max_parallel is forced to 1 when delivering over an existing connection, |
| 2268 | |
| 2269 | If all went well and continue_more is set, we shouldn't actually get here if |
| 2270 | there are further addresses, as the return above will be taken. However, |
| 2271 | writing RSET might have failed, or there may be other addresses whose hosts are |
| 2272 | specified in the transports, and therefore not visible at top level, in which |
| 2273 | case continue_more won't get set. */ |
| 2274 | |
| 2275 | (void)close(inblock.sock); |
| 2276 | continue_transport = NULL; |
| 2277 | continue_hostname = NULL; |
| 2278 | return yield; |
| 2279 | } |
| 2280 | |
| 2281 | |
| 2282 | |
| 2283 | |
| 2284 | /************************************************* |
| 2285 | * Closedown entry point * |
| 2286 | *************************************************/ |
| 2287 | |
| 2288 | /* This function is called when exim is passed an open smtp channel |
| 2289 | from another incarnation, but the message which it has been asked |
| 2290 | to deliver no longer exists. The channel is on stdin. |
| 2291 | |
| 2292 | We might do fancy things like looking for another message to send down |
| 2293 | the channel, but if the one we sought has gone, it has probably been |
| 2294 | delivered by some other process that itself will seek further messages, |
| 2295 | so just close down our connection. |
| 2296 | |
| 2297 | Argument: pointer to the transport instance block |
| 2298 | Returns: nothing |
| 2299 | */ |
| 2300 | |
| 2301 | void |
| 2302 | smtp_transport_closedown(transport_instance *tblock) |
| 2303 | { |
| 2304 | smtp_transport_options_block *ob = |
| 2305 | (smtp_transport_options_block *)(tblock->options_block); |
| 2306 | smtp_inblock inblock; |
| 2307 | smtp_outblock outblock; |
| 2308 | uschar buffer[256]; |
| 2309 | uschar inbuffer[4096]; |
| 2310 | uschar outbuffer[16]; |
| 2311 | |
| 2312 | inblock.sock = fileno(stdin); |
| 2313 | inblock.buffer = inbuffer; |
| 2314 | inblock.buffersize = sizeof(inbuffer); |
| 2315 | inblock.ptr = inbuffer; |
| 2316 | inblock.ptrend = inbuffer; |
| 2317 | |
| 2318 | outblock.sock = inblock.sock; |
| 2319 | outblock.buffersize = sizeof(outbuffer); |
| 2320 | outblock.buffer = outbuffer; |
| 2321 | outblock.ptr = outbuffer; |
| 2322 | outblock.cmd_count = 0; |
| 2323 | outblock.authenticating = FALSE; |
| 2324 | |
| 2325 | (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); |
| 2326 | (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 2327 | ob->command_timeout); |
| 2328 | (void)close(inblock.sock); |
| 2329 | } |
| 2330 | |
| 2331 | |
| 2332 | |
| 2333 | /************************************************* |
| 2334 | * Prepare addresses for delivery * |
| 2335 | *************************************************/ |
| 2336 | |
| 2337 | /* This function is called to flush out error settings from previous delivery |
| 2338 | attempts to other hosts. It also records whether we got here via an MX record |
| 2339 | or not in the more_errno field of the address. We are interested only in |
| 2340 | addresses that are still marked DEFER - others may have got delivered to a |
| 2341 | previously considered IP address. Set their status to PENDING_DEFER to indicate |
| 2342 | which ones are relevant this time. |
| 2343 | |
| 2344 | Arguments: |
| 2345 | addrlist the list of addresses |
| 2346 | host the host we are delivering to |
| 2347 | |
| 2348 | Returns: the first address for this delivery |
| 2349 | */ |
| 2350 | |
| 2351 | static address_item * |
| 2352 | prepare_addresses(address_item *addrlist, host_item *host) |
| 2353 | { |
| 2354 | address_item *first_addr = NULL; |
| 2355 | address_item *addr; |
| 2356 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2357 | { |
| 2358 | if (addr->transport_return != DEFER) continue; |
| 2359 | if (first_addr == NULL) first_addr = addr; |
| 2360 | addr->transport_return = PENDING_DEFER; |
| 2361 | addr->basic_errno = 0; |
| 2362 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; |
| 2363 | addr->message = NULL; |
| 2364 | #ifdef SUPPORT_TLS |
| 2365 | addr->cipher = NULL; |
| 2366 | addr->peerdn = NULL; |
| 2367 | #endif |
| 2368 | } |
| 2369 | return first_addr; |
| 2370 | } |
| 2371 | |
| 2372 | |
| 2373 | |
| 2374 | /************************************************* |
| 2375 | * Main entry point * |
| 2376 | *************************************************/ |
| 2377 | |
| 2378 | /* See local README for interface details. As this is a remote transport, it is |
| 2379 | given a chain of addresses to be delivered in one connection, if possible. It |
| 2380 | always returns TRUE, indicating that each address has its own independent |
| 2381 | status set, except if there is a setting up problem, in which case it returns |
| 2382 | FALSE. */ |
| 2383 | |
| 2384 | BOOL |
| 2385 | smtp_transport_entry( |
| 2386 | transport_instance *tblock, /* data for this instantiation */ |
| 2387 | address_item *addrlist) /* addresses we are working on */ |
| 2388 | { |
| 2389 | int cutoff_retry; |
| 2390 | int port; |
| 2391 | int hosts_defer = 0; |
| 2392 | int hosts_fail = 0; |
| 2393 | int hosts_looked_up = 0; |
| 2394 | int hosts_retry = 0; |
| 2395 | int hosts_serial = 0; |
| 2396 | int hosts_total = 0; |
| 2397 | int total_hosts_tried = 0; |
| 2398 | address_item *addr; |
| 2399 | BOOL expired = TRUE; |
| 2400 | BOOL continuing = continue_hostname != NULL; |
| 2401 | uschar *expanded_hosts = NULL; |
| 2402 | uschar *pistring; |
| 2403 | uschar *tid = string_sprintf("%s transport", tblock->name); |
| 2404 | smtp_transport_options_block *ob = |
| 2405 | (smtp_transport_options_block *)(tblock->options_block); |
| 2406 | host_item *hostlist = addrlist->host_list; |
| 2407 | host_item *host = NULL; |
| 2408 | |
| 2409 | DEBUG(D_transport) |
| 2410 | { |
| 2411 | debug_printf("%s transport entered\n", tblock->name); |
| 2412 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2413 | debug_printf(" %s\n", addr->address); |
| 2414 | if (continuing) debug_printf("already connected to %s [%s]\n", |
| 2415 | continue_hostname, continue_host_address); |
| 2416 | } |
| 2417 | |
| 2418 | /* Set the flag requesting that these hosts be added to the waiting |
| 2419 | database if the delivery fails temporarily or if we are running with |
| 2420 | queue_smtp or a 2-stage queue run. This gets unset for certain |
| 2421 | kinds of error, typically those that are specific to the message. */ |
| 2422 | |
| 2423 | update_waiting = TRUE; |
| 2424 | |
| 2425 | /* If a host list is not defined for the addresses - they must all have the |
| 2426 | same one in order to be passed to a single transport - or if the transport has |
| 2427 | a host list with hosts_override set, use the host list supplied with the |
| 2428 | transport. It is an error for this not to exist. */ |
| 2429 | |
| 2430 | if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL)) |
| 2431 | { |
| 2432 | if (ob->hosts == NULL) |
| 2433 | { |
| 2434 | addrlist->message = string_sprintf("%s transport called with no hosts set", |
| 2435 | tblock->name); |
| 2436 | addrlist->transport_return = PANIC; |
| 2437 | return FALSE; /* Only top address has status */ |
| 2438 | } |
| 2439 | |
| 2440 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", |
| 2441 | ob->hosts); |
| 2442 | |
| 2443 | /* If the transport's host list contains no '$' characters, and we are not |
| 2444 | randomizing, it is fixed and therefore a chain of hosts can be built once |
| 2445 | and for all, and remembered for subsequent use by other calls to this |
| 2446 | transport. If, on the other hand, the host list does contain '$', or we are |
| 2447 | randomizing its order, we have to rebuild it each time. In the fixed case, |
| 2448 | as the hosts string will never be used again, it doesn't matter that we |
| 2449 | replace all the : characters with zeros. */ |
| 2450 | |
| 2451 | if (ob->hostlist == NULL) |
| 2452 | { |
| 2453 | uschar *s = ob->hosts; |
| 2454 | |
| 2455 | if (Ustrchr(s, '$') != NULL) |
| 2456 | { |
| 2457 | expanded_hosts = expand_string(s); |
| 2458 | if (expanded_hosts == NULL) |
| 2459 | { |
| 2460 | addrlist->message = string_sprintf("failed to expand list of hosts " |
| 2461 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); |
| 2462 | addrlist->transport_return = search_find_defer? DEFER : PANIC; |
| 2463 | return FALSE; /* Only top address has status */ |
| 2464 | } |
| 2465 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " |
| 2466 | "\"%s\"\n", s, expanded_hosts); |
| 2467 | s = expanded_hosts; |
| 2468 | } |
| 2469 | else |
| 2470 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); |
| 2471 | |
| 2472 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); |
| 2473 | |
| 2474 | /* Check that the expansion yielded something useful. */ |
| 2475 | if (hostlist == NULL) |
| 2476 | { |
| 2477 | addrlist->message = |
| 2478 | string_sprintf("%s transport has empty hosts setting", tblock->name); |
| 2479 | addrlist->transport_return = PANIC; |
| 2480 | return FALSE; /* Only top address has status */ |
| 2481 | } |
| 2482 | |
| 2483 | /* If there was no expansion of hosts, save the host list for |
| 2484 | next time. */ |
| 2485 | |
| 2486 | if (expanded_hosts == NULL) ob->hostlist = hostlist; |
| 2487 | } |
| 2488 | |
| 2489 | /* This is not the first time this transport has been run in this delivery; |
| 2490 | the host list was built previously. */ |
| 2491 | |
| 2492 | else hostlist = ob->hostlist; |
| 2493 | } |
| 2494 | |
| 2495 | /* The host list was supplied with the address. If hosts_randomize is set, we |
| 2496 | must sort it into a random order if it did not come from MX records and has not |
| 2497 | already been randomized (but don't bother if continuing down an existing |
| 2498 | connection). */ |
| 2499 | |
| 2500 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing) |
| 2501 | { |
| 2502 | host_item *newlist = NULL; |
| 2503 | while (hostlist != NULL) |
| 2504 | { |
| 2505 | host_item *h = hostlist; |
| 2506 | hostlist = hostlist->next; |
| 2507 | |
| 2508 | h->sort_key = random_number(100); |
| 2509 | |
| 2510 | if (newlist == NULL) |
| 2511 | { |
| 2512 | h->next = NULL; |
| 2513 | newlist = h; |
| 2514 | } |
| 2515 | else if (h->sort_key < newlist->sort_key) |
| 2516 | { |
| 2517 | h->next = newlist; |
| 2518 | newlist = h; |
| 2519 | } |
| 2520 | else |
| 2521 | { |
| 2522 | host_item *hh = newlist; |
| 2523 | while (hh->next != NULL) |
| 2524 | { |
| 2525 | if (h->sort_key < hh->next->sort_key) break; |
| 2526 | hh = hh->next; |
| 2527 | } |
| 2528 | h->next = hh->next; |
| 2529 | hh->next = h; |
| 2530 | } |
| 2531 | } |
| 2532 | |
| 2533 | hostlist = addrlist->host_list = newlist; |
| 2534 | } |
| 2535 | |
| 2536 | |
| 2537 | /* Sort out the default port. */ |
| 2538 | |
| 2539 | if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE; |
| 2540 | |
| 2541 | |
| 2542 | /* For each host-plus-IP-address on the list: |
| 2543 | |
| 2544 | . If this is a continued delivery and the host isn't the one with the |
| 2545 | current connection, skip. |
| 2546 | |
| 2547 | . If the status is unusable (i.e. previously failed or retry checked), skip. |
| 2548 | |
| 2549 | . If no IP address set, get the address, either by turning the name into |
| 2550 | an address, calling gethostbyname if gethostbyname is on, or by calling |
| 2551 | the DNS. The DNS may yield multiple addresses, in which case insert the |
| 2552 | extra ones into the list. |
| 2553 | |
| 2554 | . Get the retry data if not previously obtained for this address and set the |
| 2555 | field which remembers the state of this address. Skip if the retry time is |
| 2556 | not reached. If not, remember whether retry data was found. The retry string |
| 2557 | contains both the name and the IP address. |
| 2558 | |
| 2559 | . Scan the list of addresses and mark those whose status is DEFER as |
| 2560 | PENDING_DEFER. These are the only ones that will be processed in this cycle |
| 2561 | of the hosts loop. |
| 2562 | |
| 2563 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. |
| 2564 | Some addresses may be successfully delivered, others may fail, and yet |
| 2565 | others may get temporary errors and so get marked DEFER. |
| 2566 | |
| 2567 | . The return from the delivery attempt is OK if a connection was made and a |
| 2568 | valid SMTP dialogue was completed. Otherwise it is DEFER. |
| 2569 | |
| 2570 | . If OK, add a "remove" retry item for this host/IPaddress, if any. |
| 2571 | |
| 2572 | . If fail to connect, or other defer state, add a retry item. |
| 2573 | |
| 2574 | . If there are any addresses whose status is still DEFER, carry on to the |
| 2575 | next host/IPaddress, unless we have tried the number of hosts given |
| 2576 | by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that |
| 2577 | there is some fancy logic for hosts_max_try that means its limit can be |
| 2578 | overstepped in some circumstances. |
| 2579 | |
| 2580 | If we get to the end of the list, all hosts have deferred at least one address, |
| 2581 | or not reached their retry times. If delay_after_cutoff is unset, it requests a |
| 2582 | delivery attempt to those hosts whose last try was before the arrival time of |
| 2583 | the current message. To cope with this, we have to go round the loop a second |
| 2584 | time. After that, set the status and error data for any addresses that haven't |
| 2585 | had it set already. */ |
| 2586 | |
| 2587 | for (cutoff_retry = 0; expired && |
| 2588 | cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2); |
| 2589 | cutoff_retry++) |
| 2590 | { |
| 2591 | host_item *nexthost = NULL; |
| 2592 | int unexpired_hosts_tried = 0; |
| 2593 | |
| 2594 | for (host = hostlist; |
| 2595 | host != NULL && |
| 2596 | unexpired_hosts_tried < ob->hosts_max_try && |
| 2597 | total_hosts_tried < ob->hosts_max_try_hardlimit; |
| 2598 | host = nexthost) |
| 2599 | { |
| 2600 | int rc; |
| 2601 | int host_af; |
| 2602 | uschar *rs; |
| 2603 | BOOL serialized = FALSE; |
| 2604 | BOOL host_is_expired = FALSE; |
| 2605 | BOOL message_defer = FALSE; |
| 2606 | BOOL ifchanges = FALSE; |
| 2607 | BOOL some_deferred = FALSE; |
| 2608 | address_item *first_addr = NULL; |
| 2609 | uschar *interface = NULL; |
| 2610 | uschar *retry_host_key = NULL; |
| 2611 | uschar *retry_message_key = NULL; |
| 2612 | uschar *serialize_key = NULL; |
| 2613 | |
| 2614 | /* Default next host is next host. :-) But this can vary if the |
| 2615 | hosts_max_try limit is hit (see below). It may also be reset if a host |
| 2616 | address is looked up here (in case the host was multihomed). */ |
| 2617 | |
| 2618 | nexthost = host->next; |
| 2619 | |
| 2620 | /* If the address hasn't yet been obtained from the host name, look it up |
| 2621 | now, unless the host is already marked as unusable. If it is marked as |
| 2622 | unusable, it means that the router was unable to find its IP address (in |
| 2623 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and |
| 2624 | the lookup failed last time. We don't get this far if *all* MX records |
| 2625 | point to non-existent hosts; that is treated as a hard error. |
| 2626 | |
| 2627 | We can just skip this host entirely. When the hosts came from the router, |
| 2628 | the address will timeout based on the other host(s); when the address is |
| 2629 | looked up below, there is an explicit retry record added. |
| 2630 | |
| 2631 | Note that we mustn't skip unusable hosts if the address is not unset; they |
| 2632 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ |
| 2633 | |
| 2634 | if (host->address == NULL) |
| 2635 | { |
| 2636 | int new_port, flags; |
| 2637 | host_item *hh; |
| 2638 | uschar *canonical_name; |
| 2639 | |
| 2640 | if (host->status >= hstatus_unusable) |
| 2641 | { |
| 2642 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", |
| 2643 | host->name); |
| 2644 | continue; |
| 2645 | } |
| 2646 | |
| 2647 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); |
| 2648 | |
| 2649 | /* The host name is permitted to have an attached port. Find it, and |
| 2650 | strip it from the name. Just remember it for now. */ |
| 2651 | |
| 2652 | new_port = host_item_get_port(host); |
| 2653 | |
| 2654 | /* Count hosts looked up */ |
| 2655 | |
| 2656 | hosts_looked_up++; |
| 2657 | |
| 2658 | /* Find by name if so configured, or if it's an IP address. We don't |
| 2659 | just copy the IP address, because we need the test-for-local to happen. */ |
| 2660 | |
| 2661 | flags = HOST_FIND_BY_A; |
| 2662 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; |
| 2663 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; |
| 2664 | |
| 2665 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0) |
| 2666 | rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE); |
| 2667 | else |
| 2668 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
| 2669 | &canonical_name, NULL); |
| 2670 | |
| 2671 | /* Update the host (and any additional blocks, resulting from |
| 2672 | multihoming) with a host-specific port, if any. */ |
| 2673 | |
| 2674 | for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port; |
| 2675 | |
| 2676 | /* Failure to find the host at this time (usually DNS temporary failure) |
| 2677 | is really a kind of routing failure rather than a transport failure. |
| 2678 | Therefore we add a retry item of the routing kind, not to stop us trying |
| 2679 | to look this name up here again, but to ensure the address gets timed |
| 2680 | out if the failures go on long enough. A complete failure at this point |
| 2681 | commonly points to a configuration error, but the best action is still |
| 2682 | to carry on for the next host. */ |
| 2683 | |
| 2684 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED) |
| 2685 | { |
| 2686 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); |
| 2687 | expired = FALSE; |
| 2688 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; |
| 2689 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? |
| 2690 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); |
| 2691 | host->status = hstatus_unusable; |
| 2692 | |
| 2693 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2694 | { |
| 2695 | if (addr->transport_return != DEFER) continue; |
| 2696 | addr->basic_errno = ERRNO_UNKNOWNHOST; |
| 2697 | addr->message = |
| 2698 | string_sprintf("failed to lookup IP address for %s", host->name); |
| 2699 | } |
| 2700 | continue; |
| 2701 | } |
| 2702 | |
| 2703 | /* If the host is actually the local host, we may have a problem, or |
| 2704 | there may be some cunning configuration going on. In the problem case, |
| 2705 | log things and give up. The default transport status is already DEFER. */ |
| 2706 | |
| 2707 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) |
| 2708 | { |
| 2709 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2710 | { |
| 2711 | addr->basic_errno = 0; |
| 2712 | addr->message = string_sprintf("%s transport found host %s to be " |
| 2713 | "local", tblock->name, host->name); |
| 2714 | } |
| 2715 | goto END_TRANSPORT; |
| 2716 | } |
| 2717 | } /* End of block for IP address lookup */ |
| 2718 | |
| 2719 | /* If this is a continued delivery, we are interested only in the host |
| 2720 | which matches the name of the existing open channel. The check is put |
| 2721 | here after the local host lookup, in case the name gets expanded as a |
| 2722 | result of the lookup. Set expired FALSE, to save the outer loop executing |
| 2723 | twice. */ |
| 2724 | |
| 2725 | if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 || |
| 2726 | Ustrcmp(continue_host_address, host->address) != 0)) |
| 2727 | { |
| 2728 | expired = FALSE; |
| 2729 | continue; /* With next host */ |
| 2730 | } |
| 2731 | |
| 2732 | /* Reset the default next host in case a multihomed host whose addresses |
| 2733 | are not looked up till just above added to the host list. */ |
| 2734 | |
| 2735 | nexthost = host->next; |
| 2736 | |
| 2737 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the |
| 2738 | domain is in queue_smtp_domains, we don't actually want to attempt any |
| 2739 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If |
| 2740 | there is a lookup defer in queue_smtp_domains, proceed as if the domain |
| 2741 | were not in it. We don't want to hold up all SMTP deliveries! Except when |
| 2742 | doing a two-stage queue run, don't do this if forcing. */ |
| 2743 | |
| 2744 | if ((!deliver_force || queue_2stage) && (queue_smtp || |
| 2745 | match_isinlist(addrlist->domain, &queue_smtp_domains, 0, |
| 2746 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)) |
| 2747 | { |
| 2748 | expired = FALSE; |
| 2749 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2750 | { |
| 2751 | if (addr->transport_return != DEFER) continue; |
| 2752 | addr->message = US"domain matches queue_smtp_domains, or -odqs set"; |
| 2753 | } |
| 2754 | continue; /* With next host */ |
| 2755 | } |
| 2756 | |
| 2757 | /* Count hosts being considered - purely for an intelligent comment |
| 2758 | if none are usable. */ |
| 2759 | |
| 2760 | hosts_total++; |
| 2761 | |
| 2762 | /* Set $host and $host address now in case they are needed for the |
| 2763 | interface expansion or the serialize_hosts check; they remain set if an |
| 2764 | actual delivery happens. */ |
| 2765 | |
| 2766 | deliver_host = host->name; |
| 2767 | deliver_host_address = host->address; |
| 2768 | |
| 2769 | /* Set up a string for adding to the retry key if the port number is not |
| 2770 | the standard SMTP port. A host may have its own port setting that overrides |
| 2771 | the default. */ |
| 2772 | |
| 2773 | pistring = string_sprintf(":%d", (host->port == PORT_NONE)? |
| 2774 | port : host->port); |
| 2775 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; |
| 2776 | |
| 2777 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface |
| 2778 | string changes upon expansion, we must add it to the key that is used for |
| 2779 | retries, because connections to the same host from a different interface |
| 2780 | should be treated separately. */ |
| 2781 | |
| 2782 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6; |
| 2783 | if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges, |
| 2784 | &interface, tid)) |
| 2785 | return FALSE; |
| 2786 | if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface); |
| 2787 | |
| 2788 | /* The first time round the outer loop, check the status of the host by |
| 2789 | inspecting the retry data. The second time round, we are interested only |
| 2790 | in expired hosts that haven't been tried since this message arrived. */ |
| 2791 | |
| 2792 | if (cutoff_retry == 0) |
| 2793 | { |
| 2794 | /* Ensure the status of the address is set by checking retry data if |
| 2795 | necessary. There maybe host-specific retry data (applicable to all |
| 2796 | messages) and also data for retries of a specific message at this host. |
| 2797 | If either of these retry records are actually read, the keys used are |
| 2798 | returned to save recomputing them later. */ |
| 2799 | |
| 2800 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, |
| 2801 | ob->retry_include_ip_address, &retry_host_key, &retry_message_key); |
| 2802 | |
| 2803 | DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name, |
| 2804 | (host->address == NULL)? US"" : host->address, pistring, |
| 2805 | (host->status == hstatus_usable)? "usable" : |
| 2806 | (host->status == hstatus_unusable)? "unusable" : |
| 2807 | (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?"); |
| 2808 | |
| 2809 | /* Skip this address if not usable at this time, noting if it wasn't |
| 2810 | actually expired, both locally and in the address. */ |
| 2811 | |
| 2812 | switch (host->status) |
| 2813 | { |
| 2814 | case hstatus_unusable: |
| 2815 | expired = FALSE; |
| 2816 | setflag(addrlist, af_retry_skipped); |
| 2817 | /* Fall through */ |
| 2818 | |
| 2819 | case hstatus_unusable_expired: |
| 2820 | switch (host->why) |
| 2821 | { |
| 2822 | case hwhy_retry: hosts_retry++; break; |
| 2823 | case hwhy_failed: hosts_fail++; break; |
| 2824 | case hwhy_deferred: hosts_defer++; break; |
| 2825 | } |
| 2826 | |
| 2827 | /* If there was a retry message key, implying that previously there |
| 2828 | was a message-specific defer, we don't want to update the list of |
| 2829 | messages waiting for these hosts. */ |
| 2830 | |
| 2831 | if (retry_message_key != NULL) update_waiting = FALSE; |
| 2832 | continue; /* With the next host or IP address */ |
| 2833 | } |
| 2834 | } |
| 2835 | |
| 2836 | /* Second time round the loop: if the address is set but expired, and |
| 2837 | the message is newer than the last try, let it through. */ |
| 2838 | |
| 2839 | else |
| 2840 | { |
| 2841 | if (host->address == NULL || |
| 2842 | host->status != hstatus_unusable_expired || |
| 2843 | host->last_try > received_time) |
| 2844 | continue; |
| 2845 | DEBUG(D_transport) |
| 2846 | debug_printf("trying expired host %s [%s]%s\n", |
| 2847 | host->name, host->address, pistring); |
| 2848 | host_is_expired = TRUE; |
| 2849 | } |
| 2850 | |
| 2851 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; |
| 2852 | it remains TRUE only if all hosts are expired and none are actually tried. |
| 2853 | */ |
| 2854 | |
| 2855 | expired = FALSE; |
| 2856 | |
| 2857 | /* If this host is listed as one to which access must be serialized, |
| 2858 | see if another Exim process has a connection to it, and if so, skip |
| 2859 | this host. If not, update the database to record our connection to it |
| 2860 | and remember this for later deletion. Do not do any of this if we are |
| 2861 | sending the message down a pre-existing connection. */ |
| 2862 | |
| 2863 | if (!continuing && |
| 2864 | verify_check_this_host(&(ob->serialize_hosts), NULL, host->name, |
| 2865 | host->address, NULL) == OK) |
| 2866 | { |
| 2867 | serialize_key = string_sprintf("host-serialize-%s", host->name); |
| 2868 | if (!enq_start(serialize_key)) |
| 2869 | { |
| 2870 | DEBUG(D_transport) |
| 2871 | debug_printf("skipping host %s because another Exim process " |
| 2872 | "is connected to it\n", host->name); |
| 2873 | hosts_serial++; |
| 2874 | continue; |
| 2875 | } |
| 2876 | serialized = TRUE; |
| 2877 | } |
| 2878 | |
| 2879 | /* OK, we have an IP address that is not waiting for its retry time to |
| 2880 | arrive (it might be expired) OR (second time round the loop) we have an |
| 2881 | expired host that hasn't been tried since the message arrived. Have a go |
| 2882 | at delivering the message to it. First prepare the addresses by flushing |
| 2883 | out the result of previous attempts, and finding the first address that |
| 2884 | is still to be delivered. */ |
| 2885 | |
| 2886 | first_addr = prepare_addresses(addrlist, host); |
| 2887 | |
| 2888 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", |
| 2889 | message_id, host->name, host->address, addrlist->address, |
| 2890 | (addrlist->next == NULL)? "" : ", ..."); |
| 2891 | |
| 2892 | set_process_info("delivering %s to %s [%s] (%s%s)", |
| 2893 | message_id, host->name, host->address, addrlist->address, |
| 2894 | (addrlist->next == NULL)? "" : ", ..."); |
| 2895 | |
| 2896 | /* This is not for real; don't do the delivery. If there are |
| 2897 | any remaining hosts, list them. */ |
| 2898 | |
| 2899 | if (dont_deliver) |
| 2900 | { |
| 2901 | host_item *host2; |
| 2902 | set_errno(addrlist, 0, NULL, OK, FALSE); |
| 2903 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2904 | { |
| 2905 | addr->host_used = host; |
| 2906 | addr->special_action = '*'; |
| 2907 | addr->message = US"delivery bypassed by -N option"; |
| 2908 | } |
| 2909 | DEBUG(D_transport) |
| 2910 | { |
| 2911 | debug_printf("*** delivery by %s transport bypassed by -N option\n" |
| 2912 | "*** host and remaining hosts:\n", tblock->name); |
| 2913 | for (host2 = host; host2 != NULL; host2 = host2->next) |
| 2914 | debug_printf(" %s [%s]\n", host2->name, |
| 2915 | (host2->address == NULL)? US"unset" : host2->address); |
| 2916 | } |
| 2917 | rc = OK; |
| 2918 | } |
| 2919 | |
| 2920 | /* This is for real. If the host is expired, we don't count it for |
| 2921 | hosts_max_retry. This ensures that all hosts must expire before an address |
| 2922 | is timed out, unless hosts_max_try_hardlimit (which protects against |
| 2923 | lunatic DNS configurations) is reached. |
| 2924 | |
| 2925 | If the host is not expired and we are about to hit the hosts_max_retry |
| 2926 | limit, check to see if there is a subsequent hosts with a different MX |
| 2927 | value. If so, make that the next host, and don't count this one. This is a |
| 2928 | heuristic to make sure that different MXs do get tried. With a normal kind |
| 2929 | of retry rule, they would get tried anyway when the earlier hosts were |
| 2930 | delayed, but if the domain has a "retry every time" type of rule - as is |
| 2931 | often used for the the very large ISPs, that won't happen. */ |
| 2932 | |
| 2933 | else |
| 2934 | { |
| 2935 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) |
| 2936 | { |
| 2937 | host_item *h; |
| 2938 | DEBUG(D_transport) |
| 2939 | debug_printf("hosts_max_try limit reached with this host\n"); |
| 2940 | for (h = host; h != NULL; h = h->next) |
| 2941 | if (h->mx != host->mx) break; |
| 2942 | if (h != NULL) |
| 2943 | { |
| 2944 | nexthost = h; |
| 2945 | unexpired_hosts_tried--; |
| 2946 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " |
| 2947 | "and will be tried\n"); |
| 2948 | } |
| 2949 | } |
| 2950 | |
| 2951 | /* Attempt the delivery. */ |
| 2952 | |
| 2953 | total_hosts_tried++; |
| 2954 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, |
| 2955 | expanded_hosts != NULL, &message_defer, FALSE); |
| 2956 | |
| 2957 | /* Yield is one of: |
| 2958 | OK => connection made, each address contains its result; |
| 2959 | message_defer is set for message-specific defers (when all |
| 2960 | recipients are marked defer) |
| 2961 | DEFER => there was a non-message-specific delivery problem; |
| 2962 | ERROR => there was a problem setting up the arguments for a filter, |
| 2963 | or there was a problem with expanding added headers |
| 2964 | */ |
| 2965 | |
| 2966 | /* If the result is not OK, there was a non-message-specific problem. |
| 2967 | If the result is DEFER, we need to write to the logs saying what happened |
| 2968 | for this particular host, except in the case of authentication and TLS |
| 2969 | failures, where the log has already been written. If all hosts defer a |
| 2970 | general message is written at the end. */ |
| 2971 | |
| 2972 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL && |
| 2973 | first_addr->basic_errno != ERRNO_TLSFAILURE) |
| 2974 | write_logs(first_addr, host); |
| 2975 | |
| 2976 | /* If STARTTLS was accepted, but there was a failure in setting up the |
| 2977 | TLS session (usually a certificate screwup), and the host is not in |
| 2978 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with |
| 2979 | TLS forcibly turned off. We have to start from scratch with a new SMTP |
| 2980 | connection. That's why the retry is done from here, not from within |
| 2981 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the |
| 2982 | session, so the in-clear transmission after those errors, if permitted, |
| 2983 | happens inside smtp_deliver().] */ |
| 2984 | |
| 2985 | #ifdef SUPPORT_TLS |
| 2986 | if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE && |
| 2987 | ob->tls_tempfail_tryclear && |
| 2988 | verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, |
| 2989 | host->address, NULL) != OK) |
| 2990 | { |
| 2991 | log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted " |
| 2992 | "to %s [%s] (not in hosts_require_tls)", host->name, host->address); |
| 2993 | first_addr = prepare_addresses(addrlist, host); |
| 2994 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, |
| 2995 | expanded_hosts != NULL, &message_defer, TRUE); |
| 2996 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) |
| 2997 | write_logs(first_addr, host); |
| 2998 | } |
| 2999 | #endif |
| 3000 | } |
| 3001 | |
| 3002 | /* Delivery attempt finished */ |
| 3003 | |
| 3004 | rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)? |
| 3005 | US"ERROR" : US"?"; |
| 3006 | |
| 3007 | set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s", |
| 3008 | message_id, host->name, host->address, addrlist->address, |
| 3009 | (addrlist->next == NULL)? "" : " (& others)", rs); |
| 3010 | |
| 3011 | /* Release serialization if set up */ |
| 3012 | |
| 3013 | if (serialized) enq_end(serialize_key); |
| 3014 | |
| 3015 | /* If the result is DEFER, or if a host retry record is known to exist, we |
| 3016 | need to add an item to the retry chain for updating the retry database |
| 3017 | at the end of delivery. We only need to add the item to the top address, |
| 3018 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it |
| 3019 | for any other delivery attempts using the same address. (It is copied into |
| 3020 | the unusable tree at the outer level, so even if different address blocks |
| 3021 | contain the same address, it still won't get tried again.) */ |
| 3022 | |
| 3023 | if (rc == DEFER || retry_host_key != NULL) |
| 3024 | { |
| 3025 | int delete_flag = (rc != DEFER)? rf_delete : 0; |
| 3026 | if (retry_host_key == NULL) |
| 3027 | { |
| 3028 | retry_host_key = ob->retry_include_ip_address? |
| 3029 | string_sprintf("T:%S:%s%s", host->name, host->address, pistring) : |
| 3030 | string_sprintf("T:%S%s", host->name, pistring); |
| 3031 | } |
| 3032 | |
| 3033 | /* If a delivery of another message over an existing SMTP connection |
| 3034 | yields DEFER, we do NOT set up retry data for the host. This covers the |
| 3035 | case when there are delays in routing the addresses in the second message |
| 3036 | that are so long that the server times out. This is alleviated by not |
| 3037 | routing addresses that previously had routing defers when handling an |
| 3038 | existing connection, but even so, this case may occur (e.g. if a |
| 3039 | previously happily routed address starts giving routing defers). If the |
| 3040 | host is genuinely down, another non-continued message delivery will |
| 3041 | notice it soon enough. */ |
| 3042 | |
| 3043 | if (delete_flag != 0 || !continuing) |
| 3044 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); |
| 3045 | |
| 3046 | /* We may have tried an expired host, if its retry time has come; ensure |
| 3047 | the status reflects the expiry for the benefit of any other addresses. */ |
| 3048 | |
| 3049 | if (rc == DEFER) |
| 3050 | { |
| 3051 | host->status = (host_is_expired)? |
| 3052 | hstatus_unusable_expired : hstatus_unusable; |
| 3053 | host->why = hwhy_deferred; |
| 3054 | } |
| 3055 | } |
| 3056 | |
| 3057 | /* If message_defer is set (host was OK, but every recipient got deferred |
| 3058 | because of some message-specific problem), or if that had happened |
| 3059 | previously so that a message retry key exists, add an appropriate item |
| 3060 | to the retry chain. Note that if there was a message defer but now there is |
| 3061 | a host defer, the message defer record gets deleted. That seems perfectly |
| 3062 | reasonable. Also, stop the message from being remembered as waiting |
| 3063 | for specific hosts. */ |
| 3064 | |
| 3065 | if (message_defer || retry_message_key != NULL) |
| 3066 | { |
| 3067 | int delete_flag = message_defer? 0 : rf_delete; |
| 3068 | if (retry_message_key == NULL) |
| 3069 | { |
| 3070 | retry_message_key = ob->retry_include_ip_address? |
| 3071 | string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, |
| 3072 | message_id) : |
| 3073 | string_sprintf("T:%S%s:%s", host->name, pistring, message_id); |
| 3074 | } |
| 3075 | retry_add_item(addrlist, retry_message_key, |
| 3076 | rf_message | rf_host | delete_flag); |
| 3077 | update_waiting = FALSE; |
| 3078 | } |
| 3079 | |
| 3080 | /* Any return other than DEFER (that is, OK or ERROR) means that the |
| 3081 | addresses have got their final statuses filled in for this host. In the OK |
| 3082 | case, see if any of them are deferred. */ |
| 3083 | |
| 3084 | if (rc == OK) |
| 3085 | { |
| 3086 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 3087 | { |
| 3088 | if (addr->transport_return == DEFER) |
| 3089 | { |
| 3090 | some_deferred = TRUE; |
| 3091 | break; |
| 3092 | } |
| 3093 | } |
| 3094 | } |
| 3095 | |
| 3096 | /* If no addresses deferred or the result was ERROR, return. We do this for |
| 3097 | ERROR because a failing filter set-up or add_headers expansion is likely to |
| 3098 | fail for any host we try. */ |
| 3099 | |
| 3100 | if (rc == ERROR || (rc == OK && !some_deferred)) |
| 3101 | { |
| 3102 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); |
| 3103 | return TRUE; /* Each address has its status */ |
| 3104 | } |
| 3105 | |
| 3106 | /* If the result was DEFER or some individual addresses deferred, let |
| 3107 | the loop run to try other hosts with the deferred addresses, except for the |
| 3108 | case when we were trying to deliver down an existing channel and failed. |
| 3109 | Don't try any other hosts in this case. */ |
| 3110 | |
| 3111 | if (continuing) break; |
| 3112 | |
| 3113 | /* If the whole delivery, or some individual addresses, were deferred and |
| 3114 | there are more hosts that could be tried, do not count this host towards |
| 3115 | the hosts_max_try limit if the age of the message is greater than the |
| 3116 | maximum retry time for this host. This means we may try try all hosts, |
| 3117 | ignoring the limit, when messages have been around for some time. This is |
| 3118 | important because if we don't try all hosts, the address will never time |
| 3119 | out. NOTE: this does not apply to hosts_max_try_hardlimit. */ |
| 3120 | |
| 3121 | if ((rc == DEFER || some_deferred) && nexthost != NULL) |
| 3122 | { |
| 3123 | BOOL timedout; |
| 3124 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); |
| 3125 | |
| 3126 | if (retry != NULL && retry->rules != NULL) |
| 3127 | { |
| 3128 | retry_rule *last_rule; |
| 3129 | for (last_rule = retry->rules; |
| 3130 | last_rule->next != NULL; |
| 3131 | last_rule = last_rule->next); |
| 3132 | timedout = time(NULL) - received_time > last_rule->timeout; |
| 3133 | } |
| 3134 | else timedout = TRUE; /* No rule => timed out */ |
| 3135 | |
| 3136 | if (timedout) |
| 3137 | { |
| 3138 | unexpired_hosts_tried--; |
| 3139 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " |
| 3140 | "hosts_max_try (message older than host's retry time)\n"); |
| 3141 | } |
| 3142 | } |
| 3143 | } /* End of loop for trying multiple hosts. */ |
| 3144 | |
| 3145 | /* This is the end of the loop that repeats iff expired is TRUE and |
| 3146 | ob->delay_after_cutoff is FALSE. The second time round we will |
| 3147 | try those hosts that haven't been tried since the message arrived. */ |
| 3148 | |
| 3149 | DEBUG(D_transport) |
| 3150 | { |
| 3151 | debug_printf("all IP addresses skipped or deferred at least one address\n"); |
| 3152 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) |
| 3153 | debug_printf("retrying IP addresses not tried since message arrived\n"); |
| 3154 | } |
| 3155 | } |
| 3156 | |
| 3157 | |
| 3158 | /* Get here if all IP addresses are skipped or defer at least one address. In |
| 3159 | MUA wrapper mode, this will happen only for connection or other non-message- |
| 3160 | specific failures. Force the delivery status for all addresses to FAIL. */ |
| 3161 | |
| 3162 | if (mua_wrapper) |
| 3163 | { |
| 3164 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 3165 | addr->transport_return = FAIL; |
| 3166 | goto END_TRANSPORT; |
| 3167 | } |
| 3168 | |
| 3169 | /* In the normal, non-wrapper case, add a standard message to each deferred |
| 3170 | address if there hasn't been an error, that is, if it hasn't actually been |
| 3171 | tried this time. The variable "expired" will be FALSE if any deliveries were |
| 3172 | actually tried, or if there was at least one host that was not expired. That |
| 3173 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If |
| 3174 | a delivery has been tried, an error code will be set, and the failing of the |
| 3175 | message is handled by the retry code later. |
| 3176 | |
| 3177 | If queue_smtp is set, or this transport was called to send a subsequent message |
| 3178 | down an existing TCP/IP connection, and something caused the host not to be |
| 3179 | found, we end up here, but can detect these cases and handle them specially. */ |
| 3180 | |
| 3181 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 3182 | { |
| 3183 | /* If host is not NULL, it means that we stopped processing the host list |
| 3184 | because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this |
| 3185 | means we need to behave as if some hosts were skipped because their retry |
| 3186 | time had not come. Specifically, this prevents the address from timing out. |
| 3187 | However, if we have hit hosts_max_try_hardlimit, we want to behave as if all |
| 3188 | hosts were tried. */ |
| 3189 | |
| 3190 | if (host != NULL) |
| 3191 | { |
| 3192 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
| 3193 | { |
| 3194 | DEBUG(D_transport) |
| 3195 | debug_printf("hosts_max_try_hardlimit reached: behave as if all " |
| 3196 | "hosts were tried\n"); |
| 3197 | } |
| 3198 | else |
| 3199 | { |
| 3200 | DEBUG(D_transport) |
| 3201 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); |
| 3202 | setflag(addr, af_retry_skipped); |
| 3203 | } |
| 3204 | } |
| 3205 | |
| 3206 | if (queue_smtp) /* no deliveries attempted */ |
| 3207 | { |
| 3208 | addr->transport_return = DEFER; |
| 3209 | addr->basic_errno = 0; |
| 3210 | addr->message = US"SMTP delivery explicitly queued"; |
| 3211 | } |
| 3212 | |
| 3213 | else if (addr->transport_return == DEFER && |
| 3214 | (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) && |
| 3215 | addr->message == NULL) |
| 3216 | { |
| 3217 | addr->basic_errno = ERRNO_HRETRY; |
| 3218 | if (continue_hostname != NULL) |
| 3219 | { |
| 3220 | addr->message = US"no host found for existing SMTP connection"; |
| 3221 | } |
| 3222 | else if (expired) |
| 3223 | { |
| 3224 | setflag(addr, af_pass_message); /* This is not a security risk */ |
| 3225 | addr->message = (ob->delay_after_cutoff)? |
| 3226 | US"retry time not reached for any host after a long failure period" : |
| 3227 | US"all hosts have been failing for a long time and were last tried " |
| 3228 | "after this message arrived"; |
| 3229 | |
| 3230 | /* If we are already using fallback hosts, or there are no fallback hosts |
| 3231 | defined, convert the result to FAIL to cause a bounce. */ |
| 3232 | |
| 3233 | if (addr->host_list == addr->fallback_hosts || |
| 3234 | addr->fallback_hosts == NULL) |
| 3235 | addr->transport_return = FAIL; |
| 3236 | } |
| 3237 | else |
| 3238 | { |
| 3239 | if (hosts_retry == hosts_total) |
| 3240 | addr->message = US"retry time not reached for any host"; |
| 3241 | else if (hosts_fail == hosts_total) |
| 3242 | addr->message = US"all host address lookups failed permanently"; |
| 3243 | else if (hosts_defer == hosts_total) |
| 3244 | addr->message = US"all host address lookups failed temporarily"; |
| 3245 | else if (hosts_serial == hosts_total) |
| 3246 | addr->message = US"connection limit reached for all hosts"; |
| 3247 | else if (hosts_fail+hosts_defer == hosts_total) |
| 3248 | addr->message = US"all host address lookups failed"; |
| 3249 | else addr->message = US"some host address lookups failed and retry time " |
| 3250 | "not reached for other hosts or connection limit reached"; |
| 3251 | } |
| 3252 | } |
| 3253 | } |
| 3254 | |
| 3255 | /* Update the database which keeps information about which messages are waiting |
| 3256 | for which hosts to become available. For some message-specific errors, the |
| 3257 | update_waiting flag is turned off because we don't want follow-on deliveries in |
| 3258 | those cases. If this transport instance is explicitly limited to one message |
| 3259 | per connection then follow-on deliveries are not possible and there's no need |
| 3260 | to create/update the per-transport wait-<transport_name> database. */ |
| 3261 | |
| 3262 | if (update_waiting && tblock->connection_max_messages != 1) |
| 3263 | transport_update_waiting(hostlist, tblock->name); |
| 3264 | |
| 3265 | END_TRANSPORT: |
| 3266 | |
| 3267 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); |
| 3268 | |
| 3269 | return TRUE; /* Each address has its status */ |
| 3270 | } |
| 3271 | |
| 3272 | /* End of transport/smtp.c */ |