| 1 | /* $Cambridge: exim/src/src/transports/smtp.c,v 1.17 2005/08/09 13:31:53 ph10 Exp $ */ |
| 2 | |
| 3 | /************************************************* |
| 4 | * Exim - an Internet mail transport agent * |
| 5 | *************************************************/ |
| 6 | |
| 7 | /* Copyright (c) University of Cambridge 1995 - 2005 */ |
| 8 | /* See the file NOTICE for conditions of use and distribution. */ |
| 9 | |
| 10 | #include "../exim.h" |
| 11 | #include "smtp.h" |
| 12 | |
| 13 | #define PENDING 256 |
| 14 | #define PENDING_DEFER (PENDING + DEFER) |
| 15 | #define PENDING_OK (PENDING + OK) |
| 16 | |
| 17 | |
| 18 | /* Options specific to the smtp transport. This transport also supports LMTP |
| 19 | over TCP/IP. The options must be in alphabetic order (note that "_" comes |
| 20 | before the lower case letters). Some live in the transport_instance block so as |
| 21 | to be publicly visible; these are flagged with opt_public. */ |
| 22 | |
| 23 | optionlist smtp_transport_options[] = { |
| 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 | { "command_timeout", opt_time, |
| 29 | (void *)offsetof(smtp_transport_options_block, command_timeout) }, |
| 30 | { "connect_timeout", opt_time, |
| 31 | (void *)offsetof(smtp_transport_options_block, connect_timeout) }, |
| 32 | { "connection_max_messages", opt_int | opt_public, |
| 33 | (void *)offsetof(transport_instance, connection_max_messages) }, |
| 34 | { "data_timeout", opt_time, |
| 35 | (void *)offsetof(smtp_transport_options_block, data_timeout) }, |
| 36 | { "delay_after_cutoff", opt_bool, |
| 37 | (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) }, |
| 38 | #ifdef EXPERIMENTAL_DOMAINKEYS |
| 39 | { "dk_canon", opt_stringptr, |
| 40 | (void *)offsetof(smtp_transport_options_block, dk_canon) }, |
| 41 | { "dk_domain", opt_stringptr, |
| 42 | (void *)offsetof(smtp_transport_options_block, dk_domain) }, |
| 43 | { "dk_headers", opt_stringptr, |
| 44 | (void *)offsetof(smtp_transport_options_block, dk_headers) }, |
| 45 | { "dk_private_key", opt_stringptr, |
| 46 | (void *)offsetof(smtp_transport_options_block, dk_private_key) }, |
| 47 | { "dk_selector", opt_stringptr, |
| 48 | (void *)offsetof(smtp_transport_options_block, dk_selector) }, |
| 49 | { "dk_strict", opt_stringptr, |
| 50 | (void *)offsetof(smtp_transport_options_block, dk_strict) }, |
| 51 | #endif |
| 52 | { "dns_qualify_single", opt_bool, |
| 53 | (void *)offsetof(smtp_transport_options_block, dns_qualify_single) }, |
| 54 | { "dns_search_parents", opt_bool, |
| 55 | (void *)offsetof(smtp_transport_options_block, dns_search_parents) }, |
| 56 | { "fallback_hosts", opt_stringptr, |
| 57 | (void *)offsetof(smtp_transport_options_block, fallback_hosts) }, |
| 58 | { "final_timeout", opt_time, |
| 59 | (void *)offsetof(smtp_transport_options_block, final_timeout) }, |
| 60 | { "gethostbyname", opt_bool, |
| 61 | (void *)offsetof(smtp_transport_options_block, gethostbyname) }, |
| 62 | { "helo_data", opt_stringptr, |
| 63 | (void *)offsetof(smtp_transport_options_block, helo_data) }, |
| 64 | { "hosts", opt_stringptr, |
| 65 | (void *)offsetof(smtp_transport_options_block, hosts) }, |
| 66 | { "hosts_avoid_esmtp", opt_stringptr, |
| 67 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) }, |
| 68 | #ifdef SUPPORT_TLS |
| 69 | { "hosts_avoid_tls", opt_stringptr, |
| 70 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) }, |
| 71 | #endif |
| 72 | { "hosts_max_try", opt_int, |
| 73 | (void *)offsetof(smtp_transport_options_block, hosts_max_try) }, |
| 74 | { "hosts_max_try_hardlimit", opt_int, |
| 75 | (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) }, |
| 76 | #ifdef SUPPORT_TLS |
| 77 | { "hosts_nopass_tls", opt_stringptr, |
| 78 | (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) }, |
| 79 | #endif |
| 80 | { "hosts_override", opt_bool, |
| 81 | (void *)offsetof(smtp_transport_options_block, hosts_override) }, |
| 82 | { "hosts_randomize", opt_bool, |
| 83 | (void *)offsetof(smtp_transport_options_block, hosts_randomize) }, |
| 84 | { "hosts_require_auth", opt_stringptr, |
| 85 | (void *)offsetof(smtp_transport_options_block, hosts_require_auth) }, |
| 86 | #ifdef SUPPORT_TLS |
| 87 | { "hosts_require_tls", opt_stringptr, |
| 88 | (void *)offsetof(smtp_transport_options_block, hosts_require_tls) }, |
| 89 | #endif |
| 90 | { "hosts_try_auth", opt_stringptr, |
| 91 | (void *)offsetof(smtp_transport_options_block, hosts_try_auth) }, |
| 92 | { "interface", opt_stringptr, |
| 93 | (void *)offsetof(smtp_transport_options_block, interface) }, |
| 94 | { "keepalive", opt_bool, |
| 95 | (void *)offsetof(smtp_transport_options_block, keepalive) }, |
| 96 | { "lmtp_ignore_quota", opt_bool, |
| 97 | (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) }, |
| 98 | { "max_rcpt", opt_int | opt_public, |
| 99 | (void *)offsetof(transport_instance, max_addresses) }, |
| 100 | { "multi_domain", opt_bool | opt_public, |
| 101 | (void *)offsetof(transport_instance, multi_domain) }, |
| 102 | { "port", opt_stringptr, |
| 103 | (void *)offsetof(smtp_transport_options_block, port) }, |
| 104 | { "protocol", opt_stringptr, |
| 105 | (void *)offsetof(smtp_transport_options_block, protocol) }, |
| 106 | { "retry_include_ip_address", opt_bool, |
| 107 | (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) }, |
| 108 | { "serialize_hosts", opt_stringptr, |
| 109 | (void *)offsetof(smtp_transport_options_block, serialize_hosts) }, |
| 110 | { "size_addition", opt_int, |
| 111 | (void *)offsetof(smtp_transport_options_block, size_addition) } |
| 112 | #ifdef SUPPORT_TLS |
| 113 | ,{ "tls_certificate", opt_stringptr, |
| 114 | (void *)offsetof(smtp_transport_options_block, tls_certificate) }, |
| 115 | { "tls_crl", opt_stringptr, |
| 116 | (void *)offsetof(smtp_transport_options_block, tls_crl) }, |
| 117 | { "tls_privatekey", opt_stringptr, |
| 118 | (void *)offsetof(smtp_transport_options_block, tls_privatekey) }, |
| 119 | { "tls_require_ciphers", opt_stringptr, |
| 120 | (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) }, |
| 121 | { "tls_tempfail_tryclear", opt_bool, |
| 122 | (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) }, |
| 123 | { "tls_verify_certificates", opt_stringptr, |
| 124 | (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) } |
| 125 | #endif |
| 126 | }; |
| 127 | |
| 128 | /* Size of the options list. An extern variable has to be used so that its |
| 129 | address can appear in the tables drtables.c. */ |
| 130 | |
| 131 | int smtp_transport_options_count = |
| 132 | sizeof(smtp_transport_options)/sizeof(optionlist); |
| 133 | |
| 134 | /* Default private options block for the smtp transport. */ |
| 135 | |
| 136 | smtp_transport_options_block smtp_transport_option_defaults = { |
| 137 | NULL, /* hosts */ |
| 138 | NULL, /* fallback_hosts */ |
| 139 | NULL, /* hostlist */ |
| 140 | NULL, /* fallback_hostlist */ |
| 141 | NULL, /* authenticated_sender */ |
| 142 | US"$primary_hostname", /* helo_data */ |
| 143 | NULL, /* interface */ |
| 144 | NULL, /* port */ |
| 145 | US"smtp", /* protocol */ |
| 146 | NULL, /* serialize_hosts */ |
| 147 | NULL, /* hosts_try_auth */ |
| 148 | NULL, /* hosts_require_auth */ |
| 149 | NULL, /* hosts_require_tls */ |
| 150 | NULL, /* hosts_avoid_tls */ |
| 151 | NULL, /* hosts_avoid_esmtp */ |
| 152 | NULL, /* hosts_nopass_tls */ |
| 153 | 5*60, /* command_timeout */ |
| 154 | 5*60, /* connect_timeout; shorter system default overrides */ |
| 155 | 5*60, /* data timeout */ |
| 156 | 10*60, /* final timeout */ |
| 157 | 1024, /* size_addition */ |
| 158 | 5, /* hosts_max_try */ |
| 159 | 50, /* hosts_max_try_hardlimit */ |
| 160 | FALSE, /* allow_localhost */ |
| 161 | FALSE, /* gethostbyname */ |
| 162 | TRUE, /* dns_qualify_single */ |
| 163 | FALSE, /* dns_search_parents */ |
| 164 | TRUE, /* delay_after_cutoff */ |
| 165 | FALSE, /* hosts_override */ |
| 166 | FALSE, /* hosts_randomize */ |
| 167 | TRUE, /* keepalive */ |
| 168 | FALSE, /* lmtp_ignore_quota */ |
| 169 | TRUE /* retry_include_ip_address */ |
| 170 | #ifdef SUPPORT_TLS |
| 171 | ,NULL, /* tls_certificate */ |
| 172 | NULL, /* tls_crl */ |
| 173 | NULL, /* tls_privatekey */ |
| 174 | NULL, /* tls_require_ciphers */ |
| 175 | NULL, /* tls_verify_certificates */ |
| 176 | TRUE /* tls_tempfail_tryclear */ |
| 177 | #endif |
| 178 | #ifdef EXPERIMENTAL_DOMAINKEYS |
| 179 | ,NULL, /* dk_canon */ |
| 180 | NULL, /* dk_domain */ |
| 181 | NULL, /* dk_headers */ |
| 182 | NULL, /* dk_private_key */ |
| 183 | NULL, /* dk_selector */ |
| 184 | NULL /* dk_strict */ |
| 185 | #endif |
| 186 | }; |
| 187 | |
| 188 | |
| 189 | /* Local statics */ |
| 190 | |
| 191 | static uschar *smtp_command; /* Points to last cmd for error messages */ |
| 192 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ |
| 193 | |
| 194 | |
| 195 | /************************************************* |
| 196 | * Setup entry point * |
| 197 | *************************************************/ |
| 198 | |
| 199 | /* This function is called when the transport is about to be used, |
| 200 | but before running it in a sub-process. It is used for two things: |
| 201 | |
| 202 | (1) To set the fallback host list in addresses, when delivering. |
| 203 | (2) To pass back the interface, port, and protocol options, for use during |
| 204 | callout verification. |
| 205 | |
| 206 | Arguments: |
| 207 | tblock pointer to the transport instance block |
| 208 | addrlist list of addresses about to be transported |
| 209 | tf if not NULL, pointer to block in which to return options |
| 210 | errmsg place for error message (not used) |
| 211 | |
| 212 | Returns: OK always (FAIL, DEFER not used) |
| 213 | */ |
| 214 | |
| 215 | static int |
| 216 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, |
| 217 | transport_feedback *tf, uschar **errmsg) |
| 218 | { |
| 219 | smtp_transport_options_block *ob = |
| 220 | (smtp_transport_options_block *)(tblock->options_block); |
| 221 | |
| 222 | errmsg = errmsg; /* Keep picky compilers happy */ |
| 223 | |
| 224 | /* Pass back options if required. This interface is getting very messy. */ |
| 225 | |
| 226 | if (tf != NULL) |
| 227 | { |
| 228 | tf->interface = ob->interface; |
| 229 | tf->port = ob->port; |
| 230 | tf->protocol = ob->protocol; |
| 231 | tf->hosts = ob->hosts; |
| 232 | tf->hosts_override = ob->hosts_override; |
| 233 | tf->hosts_randomize = ob->hosts_randomize; |
| 234 | tf->gethostbyname = ob->gethostbyname; |
| 235 | tf->qualify_single = ob->dns_qualify_single; |
| 236 | tf->search_parents = ob->dns_search_parents; |
| 237 | } |
| 238 | |
| 239 | /* Set the fallback host list for all the addresses that don't have fallback |
| 240 | host lists, provided that the local host wasn't present in the original host |
| 241 | list. */ |
| 242 | |
| 243 | if (!testflag(addrlist, af_local_host_removed)) |
| 244 | { |
| 245 | for (; addrlist != NULL; addrlist = addrlist->next) |
| 246 | if (addrlist->fallback_hosts == NULL) |
| 247 | addrlist->fallback_hosts = ob->fallback_hostlist; |
| 248 | } |
| 249 | |
| 250 | return OK; |
| 251 | } |
| 252 | |
| 253 | |
| 254 | |
| 255 | /************************************************* |
| 256 | * Initialization entry point * |
| 257 | *************************************************/ |
| 258 | |
| 259 | /* Called for each instance, after its options have been read, to |
| 260 | enable consistency checks to be done, or anything else that needs |
| 261 | to be set up. |
| 262 | |
| 263 | Argument: pointer to the transport instance block |
| 264 | Returns: nothing |
| 265 | */ |
| 266 | |
| 267 | void |
| 268 | smtp_transport_init(transport_instance *tblock) |
| 269 | { |
| 270 | smtp_transport_options_block *ob = |
| 271 | (smtp_transport_options_block *)(tblock->options_block); |
| 272 | |
| 273 | /* Retry_use_local_part defaults FALSE if unset */ |
| 274 | |
| 275 | if (tblock->retry_use_local_part == TRUE_UNSET) |
| 276 | tblock->retry_use_local_part = FALSE; |
| 277 | |
| 278 | /* Set the default port according to the protocol */ |
| 279 | |
| 280 | if (ob->port == NULL) |
| 281 | ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : US"smtp"; |
| 282 | |
| 283 | /* Set up the setup entry point, to be called before subprocesses for this |
| 284 | transport. */ |
| 285 | |
| 286 | tblock->setup = smtp_transport_setup; |
| 287 | |
| 288 | /* Complain if any of the timeouts are zero. */ |
| 289 | |
| 290 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || |
| 291 | ob->final_timeout <= 0) |
| 292 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, |
| 293 | "command, data, or final timeout value is zero for %s transport", |
| 294 | tblock->name); |
| 295 | |
| 296 | /* If hosts_override is set and there are local hosts, set the global |
| 297 | flag that stops verify from showing router hosts. */ |
| 298 | |
| 299 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; |
| 300 | |
| 301 | /* If there are any fallback hosts listed, build a chain of host items |
| 302 | for them, but do not do any lookups at this time. */ |
| 303 | |
| 304 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); |
| 305 | } |
| 306 | |
| 307 | |
| 308 | |
| 309 | |
| 310 | |
| 311 | /************************************************* |
| 312 | * Set delivery info into all active addresses * |
| 313 | *************************************************/ |
| 314 | |
| 315 | /* Only addresses whose status is >= PENDING are relevant. A lesser |
| 316 | status means that an address is not currently being processed. |
| 317 | |
| 318 | Arguments: |
| 319 | addrlist points to a chain of addresses |
| 320 | errno_value to put in each address's errno field |
| 321 | msg to put in each address's message field |
| 322 | rc to put in each address's transport_return field |
| 323 | pass_message if TRUE, set the "pass message" flag in the address |
| 324 | |
| 325 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in |
| 326 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate |
| 327 | this particular type of timeout. |
| 328 | |
| 329 | Returns: nothing |
| 330 | */ |
| 331 | |
| 332 | static void |
| 333 | set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc, |
| 334 | BOOL pass_message) |
| 335 | { |
| 336 | address_item *addr; |
| 337 | int orvalue = 0; |
| 338 | if (errno_value == ERRNO_CONNECTTIMEOUT) |
| 339 | { |
| 340 | errno_value = ETIMEDOUT; |
| 341 | orvalue = RTEF_CTOUT; |
| 342 | } |
| 343 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 344 | { |
| 345 | if (addr->transport_return < PENDING) continue; |
| 346 | addr->basic_errno = errno_value; |
| 347 | addr->more_errno |= orvalue; |
| 348 | if (msg != NULL) |
| 349 | { |
| 350 | addr->message = msg; |
| 351 | if (pass_message) setflag(addr, af_pass_message); |
| 352 | } |
| 353 | addr->transport_return = rc; |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | |
| 358 | |
| 359 | /************************************************* |
| 360 | * Check an SMTP response * |
| 361 | *************************************************/ |
| 362 | |
| 363 | /* This function is given an errno code and the SMTP response buffer |
| 364 | to analyse, together with the host identification for generating messages. It |
| 365 | sets an appropriate message and puts the first digit of the response code into |
| 366 | the yield variable. If no response was actually read, a suitable digit is |
| 367 | chosen. |
| 368 | |
| 369 | Arguments: |
| 370 | host the current host, to get its name for messages |
| 371 | errno_value pointer to the errno value |
| 372 | more_errno from the top address for use with ERRNO_FILTER_FAIL |
| 373 | buffer the SMTP response buffer |
| 374 | yield where to put a one-digit SMTP response code |
| 375 | message where to put an errror message |
| 376 | pass_message set TRUE if message is an SMTP response |
| 377 | |
| 378 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE |
| 379 | */ |
| 380 | |
| 381 | static BOOL check_response(host_item *host, int *errno_value, int more_errno, |
| 382 | uschar *buffer, int *yield, uschar **message, BOOL *pass_message) |
| 383 | { |
| 384 | uschar *pl = US""; |
| 385 | |
| 386 | if (smtp_use_pipelining && |
| 387 | (Ustrcmp(smtp_command, "MAIL") == 0 || |
| 388 | Ustrcmp(smtp_command, "RCPT") == 0 || |
| 389 | Ustrcmp(smtp_command, "DATA") == 0)) |
| 390 | pl = US"pipelined "; |
| 391 | |
| 392 | *yield = '4'; /* Default setting is to give a temporary error */ |
| 393 | |
| 394 | /* Handle response timeout */ |
| 395 | |
| 396 | if (*errno_value == ETIMEDOUT) |
| 397 | { |
| 398 | *message = US string_sprintf("SMTP timeout while connected to %s [%s] " |
| 399 | "after %s%s", host->name, host->address, pl, smtp_command); |
| 400 | if (transport_count > 0) |
| 401 | *message = US string_sprintf("%s (%d bytes written)", *message, |
| 402 | transport_count); |
| 403 | return FALSE; |
| 404 | } |
| 405 | |
| 406 | /* Handle malformed SMTP response */ |
| 407 | |
| 408 | if (*errno_value == ERRNO_SMTPFORMAT) |
| 409 | { |
| 410 | uschar *malfresp = string_printing(buffer); |
| 411 | while (isspace(*malfresp)) malfresp++; |
| 412 | if (*malfresp == 0) |
| 413 | *message = string_sprintf("Malformed SMTP reply (an empty line) from " |
| 414 | "%s [%s] in response to %s%s", host->name, host->address, pl, |
| 415 | smtp_command); |
| 416 | else |
| 417 | *message = string_sprintf("Malformed SMTP reply from %s [%s] in response " |
| 418 | "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp); |
| 419 | return FALSE; |
| 420 | } |
| 421 | |
| 422 | /* Handle a failed filter process error; can't send QUIT as we mustn't |
| 423 | end the DATA. */ |
| 424 | |
| 425 | if (*errno_value == ERRNO_FILTER_FAIL) |
| 426 | { |
| 427 | *message = US string_sprintf("transport filter process failed (%d)%s", |
| 428 | more_errno, |
| 429 | (more_errno == EX_EXECFAILED)? ": unable to execute command" : ""); |
| 430 | return FALSE; |
| 431 | } |
| 432 | |
| 433 | /* Handle a failed add_headers expansion; can't send QUIT as we mustn't |
| 434 | end the DATA. */ |
| 435 | |
| 436 | if (*errno_value == ERRNO_CHHEADER_FAIL) |
| 437 | { |
| 438 | *message = |
| 439 | US string_sprintf("failed to expand headers_add or headers_remove: %s", |
| 440 | expand_string_message); |
| 441 | return FALSE; |
| 442 | } |
| 443 | |
| 444 | /* Handle failure to write a complete data block */ |
| 445 | |
| 446 | if (*errno_value == ERRNO_WRITEINCOMPLETE) |
| 447 | { |
| 448 | *message = US string_sprintf("failed to write a data block"); |
| 449 | return FALSE; |
| 450 | } |
| 451 | |
| 452 | /* Handle error responses from the remote mailer. */ |
| 453 | |
| 454 | if (buffer[0] != 0) |
| 455 | { |
| 456 | uschar *s = string_printing(buffer); |
| 457 | *message = US string_sprintf("SMTP error from remote mail server after %s%s: " |
| 458 | "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s); |
| 459 | *pass_message = TRUE; |
| 460 | *yield = buffer[0]; |
| 461 | return TRUE; |
| 462 | } |
| 463 | |
| 464 | /* No data was read. If there is no errno, this must be the EOF (i.e. |
| 465 | connection closed) case, which causes deferral. Otherwise, put the host's |
| 466 | identity in the message, leaving the errno value to be interpreted as well. In |
| 467 | all cases, we have to assume the connection is now dead. */ |
| 468 | |
| 469 | if (*errno_value == 0) |
| 470 | { |
| 471 | *errno_value = ERRNO_SMTPCLOSED; |
| 472 | *message = US string_sprintf("Remote host %s [%s] closed connection " |
| 473 | "in response to %s%s", host->name, host->address, pl, smtp_command); |
| 474 | } |
| 475 | else *message = US string_sprintf("%s [%s]", host->name, host->address); |
| 476 | |
| 477 | return FALSE; |
| 478 | } |
| 479 | |
| 480 | |
| 481 | |
| 482 | /************************************************* |
| 483 | * Write error message to logs * |
| 484 | *************************************************/ |
| 485 | |
| 486 | /* This writes to the main log and to the message log. |
| 487 | |
| 488 | Arguments: |
| 489 | addr the address item containing error information |
| 490 | host the current host |
| 491 | |
| 492 | Returns: nothing |
| 493 | */ |
| 494 | |
| 495 | static void |
| 496 | write_logs(address_item *addr, host_item *host) |
| 497 | { |
| 498 | if (addr->message != NULL) |
| 499 | { |
| 500 | uschar *message = addr->message; |
| 501 | if (addr->basic_errno > 0) |
| 502 | message = string_sprintf("%s: %s", message, strerror(addr->basic_errno)); |
| 503 | log_write(0, LOG_MAIN, "%s", message); |
| 504 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); |
| 505 | } |
| 506 | else |
| 507 | { |
| 508 | uschar *msg = |
| 509 | ((log_extra_selector & LX_outgoing_port) != 0)? |
| 510 | string_sprintf("%s [%s]:%d", host->name, host->address, |
| 511 | (host->port == PORT_NONE)? 25 : host->port) |
| 512 | : |
| 513 | string_sprintf("%s [%s]", host->name, host->address); |
| 514 | log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno)); |
| 515 | deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg, |
| 516 | strerror(addr->basic_errno)); |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | |
| 521 | |
| 522 | /************************************************* |
| 523 | * Synchronize SMTP responses * |
| 524 | *************************************************/ |
| 525 | |
| 526 | /* This function is called from smtp_deliver() to receive SMTP responses from |
| 527 | the server, and match them up with the commands to which they relate. When |
| 528 | PIPELINING is not in use, this function is called after every command, and is |
| 529 | therefore somewhat over-engineered, but it is simpler to use a single scheme |
| 530 | that works both with and without PIPELINING instead of having two separate sets |
| 531 | of code. |
| 532 | |
| 533 | The set of commands that are buffered up with pipelining may start with MAIL |
| 534 | and may end with DATA; in between are RCPT commands that correspond to the |
| 535 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, |
| 536 | etc.) are never buffered. |
| 537 | |
| 538 | Errors after MAIL or DATA abort the whole process leaving the response in the |
| 539 | buffer. After MAIL, pending responses are flushed, and the original command is |
| 540 | re-instated in big_buffer for error messages. For RCPT commands, the remote is |
| 541 | permitted to reject some recipient addresses while accepting others. However |
| 542 | certain errors clearly abort the whole process. Set the value in |
| 543 | transport_return to PENDING_OK if the address is accepted. If there is a |
| 544 | subsequent general error, it will get reset accordingly. If not, it will get |
| 545 | converted to OK at the end. |
| 546 | |
| 547 | Arguments: |
| 548 | addrlist the complete address list |
| 549 | include_affixes TRUE if affixes include in RCPT |
| 550 | sync_addr ptr to the ptr of the one to start scanning at (updated) |
| 551 | host the host we are connected to |
| 552 | count the number of responses to read |
| 553 | pending_MAIL true if the first response is for MAIL |
| 554 | pending_DATA 0 if last command sent was not DATA |
| 555 | +1 if previously had a good recipient |
| 556 | -1 if not previously had a good recipient |
| 557 | inblock incoming SMTP block |
| 558 | timeout timeout value |
| 559 | buffer buffer for reading response |
| 560 | buffsize size of buffer |
| 561 | |
| 562 | Returns: 3 if at least one address had 2xx and one had 5xx |
| 563 | 2 if at least one address had 5xx but none had 2xx |
| 564 | 1 if at least one host had a 2xx response, but none had 5xx |
| 565 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) |
| 566 | -1 timeout while reading RCPT response |
| 567 | -2 I/O or other non-response error for RCPT |
| 568 | -3 DATA or MAIL failed - errno and buffer set |
| 569 | */ |
| 570 | |
| 571 | static int |
| 572 | sync_responses(address_item *addrlist, BOOL include_affixes, |
| 573 | address_item **sync_addr, host_item *host, int count, BOOL pending_MAIL, |
| 574 | int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer, |
| 575 | int buffsize) |
| 576 | { |
| 577 | address_item *addr = *sync_addr; |
| 578 | int yield = 0; |
| 579 | |
| 580 | /* Handle the response for a MAIL command. On error, reinstate the original |
| 581 | command in big_buffer for error message use, and flush any further pending |
| 582 | responses before returning, except after I/O errors and timeouts. */ |
| 583 | |
| 584 | if (pending_MAIL) |
| 585 | { |
| 586 | count--; |
| 587 | if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout)) |
| 588 | { |
| 589 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ |
| 590 | if (errno == 0 && buffer[0] != 0) |
| 591 | { |
| 592 | uschar flushbuffer[4096]; |
| 593 | while (count-- > 0) |
| 594 | { |
| 595 | if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer), |
| 596 | '2', timeout) |
| 597 | && (errno != 0 || flushbuffer[0] == 0)) |
| 598 | break; |
| 599 | } |
| 600 | } |
| 601 | return -3; |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | if (pending_DATA) count--; /* Number of RCPT responses to come */ |
| 606 | |
| 607 | /* Read and handle the required number of RCPT responses, matching each one up |
| 608 | with an address by scanning for the next address whose status is PENDING_DEFER. |
| 609 | */ |
| 610 | |
| 611 | while (count-- > 0) |
| 612 | { |
| 613 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; |
| 614 | |
| 615 | /* The address was accepted */ |
| 616 | |
| 617 | if (smtp_read_response(inblock, buffer, buffsize, '2', timeout)) |
| 618 | { |
| 619 | yield |= 1; |
| 620 | addr->transport_return = PENDING_OK; |
| 621 | |
| 622 | /* If af_dr_retry_exists is set, there was a routing delay on this address; |
| 623 | ensure that any address-specific retry record is expunged. */ |
| 624 | |
| 625 | if (testflag(addr, af_dr_retry_exists)) |
| 626 | retry_add_item(addr, addr->address_retry_key, rf_delete); |
| 627 | } |
| 628 | |
| 629 | /* Timeout while reading the response */ |
| 630 | |
| 631 | else if (errno == ETIMEDOUT) |
| 632 | { |
| 633 | int save_errno = errno; |
| 634 | uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] " |
| 635 | "after RCPT TO:<%s>", host->name, host->address, |
| 636 | transport_rcpt_address(addr, include_affixes)); |
| 637 | set_errno(addrlist, save_errno, message, DEFER, FALSE); |
| 638 | retry_add_item(addr, addr->address_retry_key, 0); |
| 639 | host->update_waiting = FALSE; |
| 640 | return -1; |
| 641 | } |
| 642 | |
| 643 | /* Handle other errors in obtaining an SMTP response by returning -1. This |
| 644 | will cause all the addresses to be deferred. Restore the SMTP command in |
| 645 | big_buffer for which we are checking the response, so the error message |
| 646 | makes sense. */ |
| 647 | |
| 648 | else if (errno != 0 || buffer[0] == 0) |
| 649 | { |
| 650 | string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>", |
| 651 | transport_rcpt_address(addr, include_affixes)); |
| 652 | return -2; |
| 653 | } |
| 654 | |
| 655 | /* Handle SMTP permanent and temporary response codes. */ |
| 656 | |
| 657 | else |
| 658 | { |
| 659 | addr->message = |
| 660 | string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: " |
| 661 | "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes), |
| 662 | host->name, host->address, string_printing(buffer)); |
| 663 | setflag(addr, af_pass_message); |
| 664 | deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message); |
| 665 | |
| 666 | /* The response was 5xx */ |
| 667 | |
| 668 | if (buffer[0] == '5') |
| 669 | { |
| 670 | addr->transport_return = FAIL; |
| 671 | yield |= 2; |
| 672 | } |
| 673 | |
| 674 | /* The response was 4xx */ |
| 675 | |
| 676 | else |
| 677 | { |
| 678 | int bincode = (buffer[1] - '0')*10 + buffer[2] - '0'; |
| 679 | |
| 680 | addr->transport_return = DEFER; |
| 681 | addr->basic_errno = ERRNO_RCPT4XX; |
| 682 | addr->more_errno |= bincode << 8; |
| 683 | |
| 684 | /* Log temporary errors if there are more hosts to be tried. */ |
| 685 | |
| 686 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message); |
| 687 | |
| 688 | /* Do not put this message on the list of those waiting for this host, |
| 689 | as otherwise it is likely to be tried too often. */ |
| 690 | |
| 691 | host->update_waiting = FALSE; |
| 692 | |
| 693 | /* Add a retry item for the address so that it doesn't get tried |
| 694 | again too soon. */ |
| 695 | |
| 696 | retry_add_item(addr, addr->address_retry_key, 0); |
| 697 | } |
| 698 | } |
| 699 | } /* Loop for next RCPT response */ |
| 700 | |
| 701 | /* Update where to start at for the next block of responses, unless we |
| 702 | have already handled all the addresses. */ |
| 703 | |
| 704 | if (addr != NULL) *sync_addr = addr->next; |
| 705 | |
| 706 | /* Handle a response to DATA. If we have not had any good recipients, either |
| 707 | previously or in this block, the response is ignored. */ |
| 708 | |
| 709 | if (pending_DATA != 0 && |
| 710 | !smtp_read_response(inblock, buffer, buffsize, '3', timeout)) |
| 711 | { |
| 712 | int code; |
| 713 | uschar *msg; |
| 714 | BOOL pass_message; |
| 715 | if (pending_DATA > 0 || (yield & 1) != 0) return -3; |
| 716 | (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message); |
| 717 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " |
| 718 | "is in use and there were no good recipients\n", msg); |
| 719 | } |
| 720 | |
| 721 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if |
| 722 | present) received 3xx. If any RCPTs were handled and yielded anything other |
| 723 | than 4xx, yield will be set non-zero. */ |
| 724 | |
| 725 | return yield; |
| 726 | } |
| 727 | |
| 728 | |
| 729 | |
| 730 | /************************************************* |
| 731 | * Deliver address list to given host * |
| 732 | *************************************************/ |
| 733 | |
| 734 | /* If continue_hostname is not null, we get here only when continuing to |
| 735 | deliver down an existing channel. The channel was passed as the standard |
| 736 | input. |
| 737 | |
| 738 | Otherwise, we have to make a connection to the remote host, and do the |
| 739 | initial protocol exchange. |
| 740 | |
| 741 | When running as an MUA wrapper, if the sender or any recipient is rejected, |
| 742 | temporarily or permanently, we force failure for all recipients. |
| 743 | |
| 744 | Arguments: |
| 745 | addrlist chain of potential addresses to deliver; only those whose |
| 746 | transport_return field is set to PENDING_DEFER are currently |
| 747 | being processed; others should be skipped - they have either |
| 748 | been delivered to an earlier host or IP address, or been |
| 749 | failed by one of them. |
| 750 | host host to deliver to |
| 751 | host_af AF_INET or AF_INET6 |
| 752 | port default TCP/IP port to use, in host byte order |
| 753 | interface interface to bind to, or NULL |
| 754 | tblock transport instance block |
| 755 | copy_host TRUE if host set in addr->host_used must be copied, because |
| 756 | it is specific to this call of the transport |
| 757 | message_defer set TRUE if yield is OK, but all addresses were deferred |
| 758 | because of a non-recipient, non-host failure, that is, a |
| 759 | 4xx response to MAIL FROM, DATA, or ".". This is a defer |
| 760 | that is specific to the message. |
| 761 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for |
| 762 | a second attempt after TLS initialization fails |
| 763 | |
| 764 | Returns: OK - the connection was made and the delivery attempted; |
| 765 | the result for each address is in its data block. |
| 766 | DEFER - the connection could not be made, or something failed |
| 767 | while setting up the SMTP session, or there was a |
| 768 | non-message-specific error, such as a timeout. |
| 769 | ERROR - a filter command is specified for this transport, |
| 770 | and there was a problem setting it up; OR helo_data |
| 771 | or add_headers or authenticated_sender is specified |
| 772 | for this transport, and the string failed to expand |
| 773 | */ |
| 774 | |
| 775 | static int |
| 776 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port, |
| 777 | uschar *interface, transport_instance *tblock, BOOL copy_host, |
| 778 | BOOL *message_defer, BOOL suppress_tls) |
| 779 | { |
| 780 | address_item *addr; |
| 781 | address_item *sync_addr; |
| 782 | address_item *first_addr = addrlist; |
| 783 | int yield = OK; |
| 784 | int address_count; |
| 785 | int save_errno; |
| 786 | int rc; |
| 787 | time_t start_delivery_time = time(NULL); |
| 788 | smtp_transport_options_block *ob = |
| 789 | (smtp_transport_options_block *)(tblock->options_block); |
| 790 | BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0; |
| 791 | BOOL ok = FALSE; |
| 792 | BOOL send_rset = TRUE; |
| 793 | BOOL send_quit = TRUE; |
| 794 | BOOL setting_up = TRUE; |
| 795 | BOOL completed_address = FALSE; |
| 796 | BOOL esmtp = TRUE; |
| 797 | BOOL pending_MAIL; |
| 798 | BOOL pass_message = FALSE; |
| 799 | smtp_inblock inblock; |
| 800 | smtp_outblock outblock; |
| 801 | int max_rcpt = tblock->max_addresses; |
| 802 | uschar *igquotstr = US""; |
| 803 | uschar *local_authenticated_sender = authenticated_sender; |
| 804 | uschar *helo_data; |
| 805 | uschar *message = NULL; |
| 806 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; |
| 807 | uschar *p; |
| 808 | uschar buffer[4096]; |
| 809 | uschar inbuffer[4096]; |
| 810 | uschar outbuffer[1024]; |
| 811 | |
| 812 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ |
| 813 | |
| 814 | *message_defer = FALSE; |
| 815 | smtp_command = US"initial connection"; |
| 816 | if (max_rcpt == 0) max_rcpt = 999999; |
| 817 | |
| 818 | /* Set up the buffer for reading SMTP response packets. */ |
| 819 | |
| 820 | inblock.buffer = inbuffer; |
| 821 | inblock.buffersize = sizeof(inbuffer); |
| 822 | inblock.ptr = inbuffer; |
| 823 | inblock.ptrend = inbuffer; |
| 824 | |
| 825 | /* Set up the buffer for holding SMTP commands while pipelining */ |
| 826 | |
| 827 | outblock.buffer = outbuffer; |
| 828 | outblock.buffersize = sizeof(outbuffer); |
| 829 | outblock.ptr = outbuffer; |
| 830 | outblock.cmd_count = 0; |
| 831 | outblock.authenticating = FALSE; |
| 832 | |
| 833 | /* Expand the greeting message */ |
| 834 | |
| 835 | helo_data = expand_string(ob->helo_data); |
| 836 | if (helo_data == NULL) |
| 837 | { |
| 838 | uschar *message = string_sprintf("failed to expand helo_data: %s", |
| 839 | expand_string_message); |
| 840 | set_errno(addrlist, 0, message, DEFER, FALSE); |
| 841 | return ERROR; |
| 842 | } |
| 843 | |
| 844 | /* If an authenticated_sender override has been specified for this transport |
| 845 | instance, expand it. If the expansion is forced to fail, and there was already |
| 846 | an authenticated_sender for this message, the original value will be used. |
| 847 | Other expansion failures are serious. An empty result is ignored, but there is |
| 848 | otherwise no check - this feature is expected to be used with LMTP and other |
| 849 | cases where non-standard addresses (e.g. without domains) might be required. */ |
| 850 | |
| 851 | if (ob->authenticated_sender != NULL) |
| 852 | { |
| 853 | uschar *new = expand_string(ob->authenticated_sender); |
| 854 | if (new == NULL) |
| 855 | { |
| 856 | if (!expand_string_forcedfail) |
| 857 | { |
| 858 | uschar *message = string_sprintf("failed to expand " |
| 859 | "authenticated_sender: %s", expand_string_message); |
| 860 | set_errno(addrlist, 0, message, DEFER, FALSE); |
| 861 | return ERROR; |
| 862 | } |
| 863 | } |
| 864 | else if (new[0] != 0) local_authenticated_sender = new; |
| 865 | } |
| 866 | |
| 867 | /* Make a connection to the host if this isn't a continued delivery, and handle |
| 868 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled |
| 869 | specially so they can be identified for retries. */ |
| 870 | |
| 871 | if (continue_hostname == NULL) |
| 872 | { |
| 873 | inblock.sock = outblock.sock = |
| 874 | smtp_connect(host, host_af, port, interface, ob->connect_timeout, |
| 875 | ob->keepalive); |
| 876 | if (inblock.sock < 0) |
| 877 | { |
| 878 | set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno, |
| 879 | NULL, DEFER, FALSE); |
| 880 | return DEFER; |
| 881 | } |
| 882 | |
| 883 | /* The first thing is to wait for an initial OK response. The dreaded "goto" |
| 884 | is nevertheless a reasonably clean way of programming this kind of logic, |
| 885 | where you want to escape on any error. */ |
| 886 | |
| 887 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 888 | ob->command_timeout)) goto RESPONSE_FAILED; |
| 889 | |
| 890 | /** Debugging without sending a message |
| 891 | addrlist->transport_return = DEFER; |
| 892 | goto SEND_QUIT; |
| 893 | **/ |
| 894 | |
| 895 | /* Errors that occur after this point follow an SMTP command, which is |
| 896 | left in big_buffer by smtp_write_command() for use in error messages. */ |
| 897 | |
| 898 | smtp_command = big_buffer; |
| 899 | |
| 900 | /* Tell the remote who we are... |
| 901 | |
| 902 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the |
| 903 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the |
| 904 | greeting is of this form. The assumption was that the far end supports it |
| 905 | properly... but experience shows that there are some that give 5xx responses, |
| 906 | even though the banner includes "ESMTP" (there's a bloody-minded one that |
| 907 | says "ESMTP not spoken here"). Cope with that case. |
| 908 | |
| 909 | September 2000: Time has passed, and it seems reasonable now to always send |
| 910 | EHLO at the start. It is also convenient to make the change while installing |
| 911 | the TLS stuff. |
| 912 | |
| 913 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" |
| 914 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There |
| 915 | would be no way to send out the mails, so there is now a host list |
| 916 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the |
| 917 | PIPELINING problem as well. Maybe it can also be useful to cure other |
| 918 | problems with broken servers. |
| 919 | |
| 920 | Exim originally sent "Helo" at this point and ran for nearly a year that way. |
| 921 | Then somebody tried it with a Microsoft mailer... It seems that all other |
| 922 | mailers use upper case for some reason (the RFC is quite clear about case |
| 923 | independence) so, for peace of mind, I gave in. */ |
| 924 | |
| 925 | esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL, |
| 926 | host->name, host->address, NULL) != OK; |
| 927 | |
| 928 | if (esmtp) |
| 929 | { |
| 930 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", |
| 931 | lmtp? "LHLO" : "EHLO", helo_data) < 0) |
| 932 | goto SEND_FAILED; |
| 933 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 934 | ob->command_timeout)) |
| 935 | { |
| 936 | if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED; |
| 937 | esmtp = FALSE; |
| 938 | } |
| 939 | } |
| 940 | else |
| 941 | { |
| 942 | DEBUG(D_transport) |
| 943 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); |
| 944 | } |
| 945 | |
| 946 | if (!esmtp) |
| 947 | { |
| 948 | if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0) |
| 949 | goto SEND_FAILED; |
| 950 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 951 | ob->command_timeout)) goto RESPONSE_FAILED; |
| 952 | } |
| 953 | |
| 954 | /* Set IGNOREQUOTA if the response to LHLO specifies support and the |
| 955 | lmtp_ignore_quota option was set. */ |
| 956 | |
| 957 | igquotstr = (lmtp && ob->lmtp_ignore_quota && |
| 958 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, |
| 959 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; |
| 960 | |
| 961 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ |
| 962 | |
| 963 | #ifdef SUPPORT_TLS |
| 964 | tls_offered = esmtp && |
| 965 | pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0, |
| 966 | PCRE_EOPT, NULL, 0) >= 0; |
| 967 | #endif |
| 968 | } |
| 969 | |
| 970 | /* For continuing deliveries down the same channel, the socket is the standard |
| 971 | input, and we don't need to redo EHLO here (but may need to do so for TLS - see |
| 972 | below). Set up the pointer to where subsequent commands will be left, for |
| 973 | error messages. Note that smtp_use_size and smtp_use_pipelining will have been |
| 974 | set from the command line if they were set in the process that passed the |
| 975 | connection on. */ |
| 976 | |
| 977 | else |
| 978 | { |
| 979 | inblock.sock = outblock.sock = fileno(stdin); |
| 980 | smtp_command = big_buffer; |
| 981 | } |
| 982 | |
| 983 | /* If TLS is available on this connection, whether continued or not, attempt to |
| 984 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, |
| 985 | send another EHLO - the server may give a different answer in secure mode. We |
| 986 | use a separate buffer for reading the response to STARTTLS so that if it is |
| 987 | negative, the original EHLO data is available for subsequent analysis, should |
| 988 | the client not be required to use TLS. If the response is bad, copy the buffer |
| 989 | for error analysis. */ |
| 990 | |
| 991 | #ifdef SUPPORT_TLS |
| 992 | if (tls_offered && !suppress_tls && |
| 993 | verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name, |
| 994 | host->address, NULL) != OK) |
| 995 | { |
| 996 | uschar buffer2[4096]; |
| 997 | if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0) |
| 998 | goto SEND_FAILED; |
| 999 | |
| 1000 | /* If there is an I/O error, transmission of this message is deferred. If |
| 1001 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is |
| 1002 | false, we also defer. However, if there is a temporary rejection of STARTTLS |
| 1003 | and tls_tempfail_tryclear is true, or if there is an outright rejection of |
| 1004 | STARTTLS, we carry on. This means we will try to send the message in clear, |
| 1005 | unless the host is in hosts_require_tls (tested below). */ |
| 1006 | |
| 1007 | if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2', |
| 1008 | ob->command_timeout)) |
| 1009 | { |
| 1010 | Ustrncpy(buffer, buffer2, sizeof(buffer)); |
| 1011 | if (errno != 0 || buffer2[0] == 0 || |
| 1012 | (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)) |
| 1013 | goto RESPONSE_FAILED; |
| 1014 | } |
| 1015 | |
| 1016 | /* STARTTLS accepted: try to negotiate a TLS session. */ |
| 1017 | |
| 1018 | else |
| 1019 | { |
| 1020 | int rc = tls_client_start(inblock.sock, host, addrlist, |
| 1021 | NULL, /* No DH param */ |
| 1022 | ob->tls_certificate, |
| 1023 | ob->tls_privatekey, |
| 1024 | ob->tls_verify_certificates, |
| 1025 | ob->tls_crl, |
| 1026 | ob->tls_require_ciphers, |
| 1027 | ob->command_timeout); |
| 1028 | |
| 1029 | /* TLS negotiation failed; give an error. From outside, this function may |
| 1030 | be called again to try in clear on a new connection, if the options permit |
| 1031 | it for this host. */ |
| 1032 | |
| 1033 | if (rc != OK) |
| 1034 | { |
| 1035 | save_errno = ERRNO_TLSFAILURE; |
| 1036 | message = US"failure while setting up TLS session"; |
| 1037 | send_quit = FALSE; |
| 1038 | goto TLS_FAILED; |
| 1039 | } |
| 1040 | |
| 1041 | /* TLS session is set up */ |
| 1042 | |
| 1043 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 1044 | { |
| 1045 | if (addr->transport_return == PENDING_DEFER) |
| 1046 | { |
| 1047 | addr->cipher = tls_cipher; |
| 1048 | addr->peerdn = tls_peerdn; |
| 1049 | } |
| 1050 | } |
| 1051 | } |
| 1052 | } |
| 1053 | |
| 1054 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. */ |
| 1055 | |
| 1056 | if (tls_active >= 0) |
| 1057 | { |
| 1058 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", lmtp? "LHLO" : "EHLO", |
| 1059 | helo_data) < 0) |
| 1060 | goto SEND_FAILED; |
| 1061 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1062 | ob->command_timeout)) |
| 1063 | goto RESPONSE_FAILED; |
| 1064 | } |
| 1065 | |
| 1066 | /* If the host is required to use a secure channel, ensure that we |
| 1067 | have one. */ |
| 1068 | |
| 1069 | else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, |
| 1070 | host->address, NULL) == OK) |
| 1071 | { |
| 1072 | save_errno = ERRNO_TLSREQUIRED; |
| 1073 | message = string_sprintf("a TLS session is required for %s [%s], but %s", |
| 1074 | host->name, host->address, |
| 1075 | tls_offered? "an attempt to start TLS failed" : |
| 1076 | "the server did not offer TLS support"); |
| 1077 | goto TLS_FAILED; |
| 1078 | } |
| 1079 | #endif |
| 1080 | |
| 1081 | /* If TLS is active, we have just started it up and re-done the EHLO command, |
| 1082 | so its response needs to be analyzed. If TLS is not active and this is a |
| 1083 | continued session down a previously-used socket, we haven't just done EHLO, so |
| 1084 | we skip this. */ |
| 1085 | |
| 1086 | if (continue_hostname == NULL |
| 1087 | #ifdef SUPPORT_TLS |
| 1088 | || tls_active >= 0 |
| 1089 | #endif |
| 1090 | ) |
| 1091 | { |
| 1092 | int require_auth; |
| 1093 | uschar *fail_reason = US"server did not advertise AUTH support"; |
| 1094 | |
| 1095 | /* Set for IGNOREQUOTA if the response to LHLO specifies support and the |
| 1096 | lmtp_ignore_quota option was set. */ |
| 1097 | |
| 1098 | igquotstr = (lmtp && ob->lmtp_ignore_quota && |
| 1099 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, |
| 1100 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; |
| 1101 | |
| 1102 | /* If the response to EHLO specified support for the SIZE parameter, note |
| 1103 | this, provided size_addition is non-negative. */ |
| 1104 | |
| 1105 | smtp_use_size = esmtp && ob->size_addition >= 0 && |
| 1106 | pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0, |
| 1107 | PCRE_EOPT, NULL, 0) >= 0; |
| 1108 | |
| 1109 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched |
| 1110 | the current host, esmtp will be false, so PIPELINING can never be used. */ |
| 1111 | |
| 1112 | smtp_use_pipelining = esmtp && |
| 1113 | pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0, |
| 1114 | PCRE_EOPT, NULL, 0) >= 0; |
| 1115 | |
| 1116 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", |
| 1117 | smtp_use_pipelining? "" : "not "); |
| 1118 | |
| 1119 | /* Note if the response to EHLO specifies support for the AUTH extension. |
| 1120 | If it has, check that this host is one we want to authenticate to, and do |
| 1121 | the business. The host name and address must be available when the |
| 1122 | authenticator's client driver is running. */ |
| 1123 | |
| 1124 | smtp_authenticated = FALSE; |
| 1125 | require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL, |
| 1126 | host->name, host->address, NULL); |
| 1127 | |
| 1128 | if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1)) |
| 1129 | { |
| 1130 | uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]); |
| 1131 | expand_nmax = -1; /* reset */ |
| 1132 | |
| 1133 | /* Must not do this check until after we have saved the result of the |
| 1134 | regex match above. */ |
| 1135 | |
| 1136 | if (require_auth == OK || |
| 1137 | verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name, |
| 1138 | host->address, NULL) == OK) |
| 1139 | { |
| 1140 | auth_instance *au; |
| 1141 | fail_reason = US"no common mechanisms were found"; |
| 1142 | |
| 1143 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); |
| 1144 | |
| 1145 | /* Scan the configured authenticators looking for one which is configured |
| 1146 | for use as a client and whose name matches an authentication mechanism |
| 1147 | supported by the server. If one is found, attempt to authenticate by |
| 1148 | calling its client function. */ |
| 1149 | |
| 1150 | for (au = auths; !smtp_authenticated && au != NULL; au = au->next) |
| 1151 | { |
| 1152 | uschar *p = names; |
| 1153 | if (!au->client) continue; |
| 1154 | |
| 1155 | /* Loop to scan supported server mechanisms */ |
| 1156 | |
| 1157 | while (*p != 0) |
| 1158 | { |
| 1159 | int rc; |
| 1160 | int len = Ustrlen(au->public_name); |
| 1161 | while (isspace(*p)) p++; |
| 1162 | |
| 1163 | if (strncmpic(au->public_name, p, len) != 0 || |
| 1164 | (p[len] != 0 && !isspace(p[len]))) |
| 1165 | { |
| 1166 | while (*p != 0 && !isspace(*p)) p++; |
| 1167 | continue; |
| 1168 | } |
| 1169 | |
| 1170 | /* Found data for a listed mechanism. Call its client entry. Set |
| 1171 | a flag in the outblock so that data is overwritten after sending so |
| 1172 | that reflections don't show it. */ |
| 1173 | |
| 1174 | fail_reason = US"authentication attempt(s) failed"; |
| 1175 | outblock.authenticating = TRUE; |
| 1176 | rc = (au->info->clientcode)(au, &inblock, &outblock, |
| 1177 | ob->command_timeout, buffer, sizeof(buffer)); |
| 1178 | outblock.authenticating = FALSE; |
| 1179 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", |
| 1180 | au->name, rc); |
| 1181 | |
| 1182 | /* A temporary authentication failure must hold up delivery to |
| 1183 | this host. After a permanent authentication failure, we carry on |
| 1184 | to try other authentication methods. If all fail hard, try to |
| 1185 | deliver the message unauthenticated unless require_auth was set. */ |
| 1186 | |
| 1187 | switch(rc) |
| 1188 | { |
| 1189 | case OK: |
| 1190 | smtp_authenticated = TRUE; /* stops the outer loop */ |
| 1191 | break; |
| 1192 | |
| 1193 | /* Failure after writing a command */ |
| 1194 | |
| 1195 | case FAIL_SEND: |
| 1196 | goto SEND_FAILED; |
| 1197 | |
| 1198 | /* Failure after reading a response */ |
| 1199 | |
| 1200 | case FAIL: |
| 1201 | if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED; |
| 1202 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", |
| 1203 | au->name, host->name, host->address, buffer); |
| 1204 | break; |
| 1205 | |
| 1206 | /* Failure by some other means. In effect, the authenticator |
| 1207 | decided it wasn't prepared to handle this case. Typically this |
| 1208 | is the result of "fail" in an expansion string. Do we need to |
| 1209 | log anything here? */ |
| 1210 | |
| 1211 | case CANCELLED: |
| 1212 | break; |
| 1213 | |
| 1214 | /* Internal problem, message in buffer. */ |
| 1215 | |
| 1216 | case ERROR: |
| 1217 | yield = ERROR; |
| 1218 | set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE); |
| 1219 | goto SEND_QUIT; |
| 1220 | } |
| 1221 | |
| 1222 | break; /* If not authenticated, try next authenticator */ |
| 1223 | } /* Loop for scanning supported server mechanisms */ |
| 1224 | } /* Loop for further authenticators */ |
| 1225 | } |
| 1226 | } |
| 1227 | |
| 1228 | /* If we haven't authenticated, but are required to, give up. */ |
| 1229 | |
| 1230 | if (require_auth == OK && !smtp_authenticated) |
| 1231 | { |
| 1232 | yield = DEFER; |
| 1233 | set_errno(addrlist, ERRNO_AUTHFAIL, |
| 1234 | string_sprintf("authentication required but %s", fail_reason), DEFER, |
| 1235 | FALSE); |
| 1236 | goto SEND_QUIT; |
| 1237 | } |
| 1238 | } |
| 1239 | |
| 1240 | /* The setting up of the SMTP call is now complete. Any subsequent errors are |
| 1241 | message-specific. */ |
| 1242 | |
| 1243 | setting_up = FALSE; |
| 1244 | |
| 1245 | /* If there is a filter command specified for this transport, we can now |
| 1246 | set it up. This cannot be done until the identify of the host is known. */ |
| 1247 | |
| 1248 | if (tblock->filter_command != NULL) |
| 1249 | { |
| 1250 | BOOL rc; |
| 1251 | uschar buffer[64]; |
| 1252 | sprintf(CS buffer, "%.50s transport", tblock->name); |
| 1253 | rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command, |
| 1254 | TRUE, DEFER, addrlist, buffer, NULL); |
| 1255 | |
| 1256 | /* On failure, copy the error to all addresses, abandon the SMTP call, and |
| 1257 | yield ERROR. */ |
| 1258 | |
| 1259 | if (!rc) |
| 1260 | { |
| 1261 | set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER, |
| 1262 | FALSE); |
| 1263 | yield = ERROR; |
| 1264 | goto SEND_QUIT; |
| 1265 | } |
| 1266 | } |
| 1267 | |
| 1268 | |
| 1269 | /* For messages that have more than the maximum number of envelope recipients, |
| 1270 | we want to send several transactions down the same SMTP connection. (See |
| 1271 | comments in deliver.c as to how this reconciles, heuristically, with |
| 1272 | remote_max_parallel.) This optimization was added to Exim after the following |
| 1273 | code was already working. The simplest way to put it in without disturbing the |
| 1274 | code was to use a goto to jump back to this point when there is another |
| 1275 | transaction to handle. */ |
| 1276 | |
| 1277 | SEND_MESSAGE: |
| 1278 | sync_addr = first_addr; |
| 1279 | address_count = 0; |
| 1280 | ok = FALSE; |
| 1281 | send_rset = TRUE; |
| 1282 | completed_address = FALSE; |
| 1283 | |
| 1284 | |
| 1285 | /* Initiate a message transfer. If we know the receiving MTA supports the SIZE |
| 1286 | qualification, send it, adding something to the message size to allow for |
| 1287 | imprecision and things that get added en route. Exim keeps the number of lines |
| 1288 | in a message, so we can give an accurate value for the original message, but we |
| 1289 | need some additional to handle added headers. (Double "." characters don't get |
| 1290 | included in the count.) */ |
| 1291 | |
| 1292 | p = buffer; |
| 1293 | *p = 0; |
| 1294 | |
| 1295 | if (smtp_use_size) |
| 1296 | { |
| 1297 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition); |
| 1298 | while (*p) p++; |
| 1299 | } |
| 1300 | |
| 1301 | /* Add the authenticated sender address if present */ |
| 1302 | |
| 1303 | if (smtp_authenticated && local_authenticated_sender != NULL) |
| 1304 | { |
| 1305 | string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s", |
| 1306 | auth_xtextencode(local_authenticated_sender, |
| 1307 | Ustrlen(local_authenticated_sender))); |
| 1308 | } |
| 1309 | |
| 1310 | /* From here until we send the DATA command, we can make use of PIPELINING |
| 1311 | if the server host supports it. The code has to be able to check the responses |
| 1312 | at any point, for when the buffer fills up, so we write it totally generally. |
| 1313 | When PIPELINING is off, each command written reports that it has flushed the |
| 1314 | buffer. */ |
| 1315 | |
| 1316 | pending_MAIL = TRUE; /* The block starts with MAIL */ |
| 1317 | |
| 1318 | rc = smtp_write_command(&outblock, smtp_use_pipelining, |
| 1319 | "MAIL FROM:<%s>%s\r\n", return_path, buffer); |
| 1320 | mail_command = string_copy(big_buffer); /* Save for later error message */ |
| 1321 | |
| 1322 | switch(rc) |
| 1323 | { |
| 1324 | case -1: /* Transmission error */ |
| 1325 | goto SEND_FAILED; |
| 1326 | |
| 1327 | case +1: /* Block was sent */ |
| 1328 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1329 | ob->command_timeout)) goto RESPONSE_FAILED; |
| 1330 | pending_MAIL = FALSE; |
| 1331 | break; |
| 1332 | } |
| 1333 | |
| 1334 | /* Pass over all the relevant recipient addresses for this host, which are the |
| 1335 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send |
| 1336 | several before we have to read the responses for those seen so far. This |
| 1337 | checking is done by a subroutine because it also needs to be done at the end. |
| 1338 | Send only up to max_rcpt addresses at a time, leaving first_addr pointing to |
| 1339 | the next one if not all are sent. |
| 1340 | |
| 1341 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the |
| 1342 | last address because we want to abort if any recipients have any kind of |
| 1343 | problem, temporary or permanent. We know that all recipient addresses will have |
| 1344 | the PENDING_DEFER status, because only one attempt is ever made, and we know |
| 1345 | that max_rcpt will be large, so all addresses will be done at once. */ |
| 1346 | |
| 1347 | for (addr = first_addr; |
| 1348 | address_count < max_rcpt && addr != NULL; |
| 1349 | addr = addr->next) |
| 1350 | { |
| 1351 | int count; |
| 1352 | BOOL no_flush; |
| 1353 | |
| 1354 | if (addr->transport_return != PENDING_DEFER) continue; |
| 1355 | |
| 1356 | address_count++; |
| 1357 | no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL); |
| 1358 | |
| 1359 | /* Now send the RCPT command, and process outstanding responses when |
| 1360 | necessary. After a timeout on RCPT, we just end the function, leaving the |
| 1361 | yield as OK, because this error can often mean that there is a problem with |
| 1362 | just one address, so we don't want to delay the host. */ |
| 1363 | |
| 1364 | count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n", |
| 1365 | transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr); |
| 1366 | if (count < 0) goto SEND_FAILED; |
| 1367 | if (count > 0) |
| 1368 | { |
| 1369 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, |
| 1370 | &sync_addr, host, count, pending_MAIL, 0, &inblock, |
| 1371 | ob->command_timeout, buffer, sizeof(buffer))) |
| 1372 | { |
| 1373 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 1374 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ |
| 1375 | break; |
| 1376 | |
| 1377 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 1378 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ |
| 1379 | case 0: /* No 2xx or 5xx, but no probs */ |
| 1380 | break; |
| 1381 | |
| 1382 | case -1: goto END_OFF; /* Timeout on RCPT */ |
| 1383 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */ |
| 1384 | } |
| 1385 | pending_MAIL = FALSE; /* Dealt with MAIL */ |
| 1386 | } |
| 1387 | } /* Loop for next address */ |
| 1388 | |
| 1389 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either |
| 1390 | permanently or temporarily. We should have flushed and synced after the last |
| 1391 | RCPT. */ |
| 1392 | |
| 1393 | if (mua_wrapper) |
| 1394 | { |
| 1395 | address_item *badaddr; |
| 1396 | for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next) |
| 1397 | { |
| 1398 | if (badaddr->transport_return != PENDING_OK) break; |
| 1399 | } |
| 1400 | if (badaddr != NULL) |
| 1401 | { |
| 1402 | set_errno(addrlist, 0, badaddr->message, FAIL, |
| 1403 | testflag(badaddr, af_pass_message)); |
| 1404 | ok = FALSE; |
| 1405 | } |
| 1406 | } |
| 1407 | |
| 1408 | /* If ok is TRUE, we know we have got at least one good recipient, and must now |
| 1409 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still |
| 1410 | have a good recipient buffered up if we are pipelining. We don't want to waste |
| 1411 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we |
| 1412 | are pipelining. The responses are all handled by sync_responses(). */ |
| 1413 | |
| 1414 | if (ok || (smtp_use_pipelining && !mua_wrapper)) |
| 1415 | { |
| 1416 | int count = smtp_write_command(&outblock, FALSE, "DATA\r\n"); |
| 1417 | if (count < 0) goto SEND_FAILED; |
| 1418 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr, |
| 1419 | host, count, pending_MAIL, ok? +1 : -1, &inblock, |
| 1420 | ob->command_timeout, buffer, sizeof(buffer))) |
| 1421 | { |
| 1422 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 1423 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ |
| 1424 | break; |
| 1425 | |
| 1426 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 1427 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ |
| 1428 | case 0: break; /* No 2xx or 5xx, but no probs */ |
| 1429 | |
| 1430 | case -1: goto END_OFF; /* Timeout on RCPT */ |
| 1431 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ |
| 1432 | } |
| 1433 | } |
| 1434 | |
| 1435 | /* Save the first address of the next batch. */ |
| 1436 | |
| 1437 | first_addr = addr; |
| 1438 | |
| 1439 | /* If there were no good recipients (but otherwise there have been no |
| 1440 | problems), just set ok TRUE, since we have handled address-specific errors |
| 1441 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism |
| 1442 | for handling the SMTP dot-handling protocol, flagging to apply to headers as |
| 1443 | well as body. Set the appropriate timeout value to be used for each chunk. |
| 1444 | (Haven't been able to make it work using select() for writing yet.) */ |
| 1445 | |
| 1446 | if (!ok) ok = TRUE; else |
| 1447 | { |
| 1448 | sigalrm_seen = FALSE; |
| 1449 | transport_write_timeout = ob->data_timeout; |
| 1450 | smtp_command = US"sending data block"; /* For error messages */ |
| 1451 | DEBUG(D_transport|D_v) |
| 1452 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); |
| 1453 | transport_count = 0; |
| 1454 | #ifdef EXPERIMENTAL_DOMAINKEYS |
| 1455 | if ( (ob->dk_private_key != NULL) && (ob->dk_selector != NULL) ) |
| 1456 | ok = dk_transport_write_message(addrlist, inblock.sock, |
| 1457 | topt_use_crlf | topt_end_dot | topt_escape_headers | |
| 1458 | (tblock->body_only? topt_no_headers : 0) | |
| 1459 | (tblock->headers_only? topt_no_body : 0) | |
| 1460 | (tblock->return_path_add? topt_add_return_path : 0) | |
| 1461 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | |
| 1462 | (tblock->envelope_to_add? topt_add_envelope_to : 0), |
| 1463 | 0, /* No size limit */ |
| 1464 | tblock->add_headers, tblock->remove_headers, |
| 1465 | US".", US"..", /* Escaping strings */ |
| 1466 | tblock->rewrite_rules, tblock->rewrite_existflags, |
| 1467 | ob->dk_private_key, ob->dk_domain, ob->dk_selector, |
| 1468 | ob->dk_canon, ob->dk_headers, ob->dk_strict); |
| 1469 | else |
| 1470 | #endif |
| 1471 | ok = transport_write_message(addrlist, inblock.sock, |
| 1472 | topt_use_crlf | topt_end_dot | topt_escape_headers | |
| 1473 | (tblock->body_only? topt_no_headers : 0) | |
| 1474 | (tblock->headers_only? topt_no_body : 0) | |
| 1475 | (tblock->return_path_add? topt_add_return_path : 0) | |
| 1476 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | |
| 1477 | (tblock->envelope_to_add? topt_add_envelope_to : 0), |
| 1478 | 0, /* No size limit */ |
| 1479 | tblock->add_headers, tblock->remove_headers, |
| 1480 | US".", US"..", /* Escaping strings */ |
| 1481 | tblock->rewrite_rules, tblock->rewrite_existflags); |
| 1482 | |
| 1483 | /* transport_write_message() uses write() because it is called from other |
| 1484 | places to write to non-sockets. This means that under some OS (e.g. Solaris) |
| 1485 | it can exit with "Broken pipe" as its error. This really means that the |
| 1486 | socket got closed at the far end. */ |
| 1487 | |
| 1488 | transport_write_timeout = 0; /* for subsequent transports */ |
| 1489 | |
| 1490 | /* Failure can either be some kind of I/O disaster (including timeout), |
| 1491 | or the failure of a transport filter or the expansion of added headers. */ |
| 1492 | |
| 1493 | if (!ok) |
| 1494 | { |
| 1495 | buffer[0] = 0; /* There hasn't been a response */ |
| 1496 | goto RESPONSE_FAILED; |
| 1497 | } |
| 1498 | |
| 1499 | /* We used to send the terminating "." explicitly here, but because of |
| 1500 | buffering effects at both ends of TCP/IP connections, you don't gain |
| 1501 | anything by keeping it separate, so it might as well go in the final |
| 1502 | data buffer for efficiency. This is now done by setting the topt_end_dot |
| 1503 | flag above. */ |
| 1504 | |
| 1505 | smtp_command = US"end of data"; |
| 1506 | |
| 1507 | /* For SMTP, we now read a single response that applies to the whole message. |
| 1508 | If it is OK, then all the addresses have been delivered. */ |
| 1509 | |
| 1510 | if (!lmtp) ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1511 | ob->final_timeout); |
| 1512 | |
| 1513 | /* For LMTP, we get back a response for every RCPT command that we sent; |
| 1514 | some may be accepted and some rejected. For those that get a response, their |
| 1515 | status is fixed; any that are accepted have been handed over, even if later |
| 1516 | responses crash - at least, that's how I read RFC 2033. |
| 1517 | |
| 1518 | If all went well, mark the recipient addresses as completed, record which |
| 1519 | host/IPaddress they were delivered to, and cut out RSET when sending another |
| 1520 | message down the same channel. Write the completed addresses to the journal |
| 1521 | now so that they are recorded in case there is a crash of hardware or |
| 1522 | software before the spool gets updated. Also record the final SMTP |
| 1523 | confirmation if needed (for SMTP only). */ |
| 1524 | |
| 1525 | if (ok) |
| 1526 | { |
| 1527 | int flag = '='; |
| 1528 | int delivery_time = (int)(time(NULL) - start_delivery_time); |
| 1529 | int len; |
| 1530 | host_item *thost; |
| 1531 | uschar *conf = NULL; |
| 1532 | send_rset = FALSE; |
| 1533 | |
| 1534 | /* Make a copy of the host if it is local to this invocation |
| 1535 | of the transport. */ |
| 1536 | |
| 1537 | if (copy_host) |
| 1538 | { |
| 1539 | thost = store_get(sizeof(host_item)); |
| 1540 | *thost = *host; |
| 1541 | thost->name = string_copy(host->name); |
| 1542 | thost->address = string_copy(host->address); |
| 1543 | } |
| 1544 | else thost = host; |
| 1545 | |
| 1546 | /* Set up confirmation if needed - applies only to SMTP */ |
| 1547 | |
| 1548 | if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp) |
| 1549 | { |
| 1550 | uschar *s = string_printing(buffer); |
| 1551 | conf = (s == buffer)? (uschar *)string_copy(s) : s; |
| 1552 | } |
| 1553 | |
| 1554 | /* Process all transported addresses - for LMTP, read a status for |
| 1555 | each one. */ |
| 1556 | |
| 1557 | for (addr = addrlist; addr != first_addr; addr = addr->next) |
| 1558 | { |
| 1559 | if (addr->transport_return != PENDING_OK) continue; |
| 1560 | |
| 1561 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the |
| 1562 | remaining addresses. Otherwise, it's a return code for just the one |
| 1563 | address. */ |
| 1564 | |
| 1565 | if (lmtp) |
| 1566 | { |
| 1567 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1568 | ob->final_timeout)) |
| 1569 | { |
| 1570 | if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED; |
| 1571 | addr->message = string_sprintf("LMTP error after %s: %s", |
| 1572 | big_buffer, string_printing(buffer)); |
| 1573 | addr->transport_return = (buffer[0] == '5')? FAIL : DEFER; |
| 1574 | continue; |
| 1575 | } |
| 1576 | completed_address = TRUE; /* NOW we can set this flag */ |
| 1577 | } |
| 1578 | |
| 1579 | /* SMTP, or success return from LMTP for this address. Pass back the |
| 1580 | actual host that was used. */ |
| 1581 | |
| 1582 | addr->transport_return = OK; |
| 1583 | addr->more_errno = delivery_time; |
| 1584 | addr->host_used = thost; |
| 1585 | addr->special_action = flag; |
| 1586 | addr->message = conf; |
| 1587 | flag = '-'; |
| 1588 | |
| 1589 | /* Update the journal. For homonymic addresses, use the base address plus |
| 1590 | the transport name. See lots of comments in deliver.c about the reasons |
| 1591 | for the complications when homonyms are involved. Just carry on after |
| 1592 | write error, as it may prove possible to update the spool file later. */ |
| 1593 | |
| 1594 | if (testflag(addr, af_homonym)) |
| 1595 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); |
| 1596 | else |
| 1597 | sprintf(CS buffer, "%.500s\n", addr->unique); |
| 1598 | |
| 1599 | DEBUG(D_deliver) debug_printf("journalling %s", buffer); |
| 1600 | len = Ustrlen(CS buffer); |
| 1601 | if (write(journal_fd, buffer, len) != len) |
| 1602 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " |
| 1603 | "%s: %s", buffer, strerror(errno)); |
| 1604 | } |
| 1605 | |
| 1606 | /* Ensure the journal file is pushed out to disk. */ |
| 1607 | |
| 1608 | if (fsync(journal_fd) < 0) |
| 1609 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", |
| 1610 | strerror(errno)); |
| 1611 | } |
| 1612 | } |
| 1613 | |
| 1614 | |
| 1615 | /* Handle general (not specific to one address) failures here. The value of ok |
| 1616 | is used to skip over this code on the falling through case. A timeout causes a |
| 1617 | deferral. Other errors may defer or fail according to the response code, and |
| 1618 | may set up a special errno value, e.g. after connection chopped, which is |
| 1619 | assumed if errno == 0 and there is no text in the buffer. If control reaches |
| 1620 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as |
| 1621 | the problem is not related to this specific message. */ |
| 1622 | |
| 1623 | if (!ok) |
| 1624 | { |
| 1625 | int code; |
| 1626 | |
| 1627 | RESPONSE_FAILED: |
| 1628 | save_errno = errno; |
| 1629 | message = NULL; |
| 1630 | send_quit = check_response(host, &save_errno, addrlist->more_errno, |
| 1631 | buffer, &code, &message, &pass_message); |
| 1632 | goto FAILED; |
| 1633 | |
| 1634 | SEND_FAILED: |
| 1635 | save_errno = errno; |
| 1636 | code = '4'; |
| 1637 | message = US string_sprintf("send() to %s [%s] failed: %s", |
| 1638 | host->name, host->address, strerror(save_errno)); |
| 1639 | send_quit = FALSE; |
| 1640 | goto FAILED; |
| 1641 | |
| 1642 | /* This label is jumped to directly when a TLS negotiation has failed, |
| 1643 | or was not done for a host for which it is required. Values will be set |
| 1644 | in message and save_errno, and setting_up will always be true. Treat as |
| 1645 | a temporary error. */ |
| 1646 | |
| 1647 | #ifdef SUPPORT_TLS |
| 1648 | TLS_FAILED: |
| 1649 | code = '4'; |
| 1650 | #endif |
| 1651 | |
| 1652 | /* If the failure happened while setting up the call, see if the failure was |
| 1653 | a 5xx response (this will either be on connection, or following HELO - a 5xx |
| 1654 | after EHLO causes it to try HELO). If so, fail all addresses, as this host is |
| 1655 | never going to accept them. For other errors during setting up (timeouts or |
| 1656 | whatever), defer all addresses, and yield DEFER, so that the host is not |
| 1657 | tried again for a while. */ |
| 1658 | |
| 1659 | FAILED: |
| 1660 | ok = FALSE; /* For when reached by GOTO */ |
| 1661 | |
| 1662 | if (setting_up) |
| 1663 | { |
| 1664 | if (code == '5') |
| 1665 | { |
| 1666 | set_errno(addrlist, save_errno, message, FAIL, pass_message); |
| 1667 | } |
| 1668 | else |
| 1669 | { |
| 1670 | set_errno(addrlist, save_errno, message, DEFER, pass_message); |
| 1671 | yield = DEFER; |
| 1672 | } |
| 1673 | } |
| 1674 | |
| 1675 | /* If there was an I/O error or timeout or other transportation error, |
| 1676 | indicated by errno being non-zero, defer all addresses and yield DEFER, |
| 1677 | except for the case of failed add_headers expansion, or a transport filter |
| 1678 | failure, when the yield should be ERROR, to stop it trying other hosts. |
| 1679 | |
| 1680 | However, handle timeouts after MAIL FROM or "." and loss of connection after |
| 1681 | "." specially. They can indicate a problem with the sender address or with |
| 1682 | the contents of the message rather than a real error on the connection. |
| 1683 | Therefore, treat these cases in the same way as a 4xx response. |
| 1684 | |
| 1685 | The following condition tests for NOT these special cases. */ |
| 1686 | |
| 1687 | else if (save_errno != 0 && |
| 1688 | (save_errno != ETIMEDOUT || |
| 1689 | (Ustrncmp(smtp_command,"MAIL",4) != 0 && |
| 1690 | Ustrncmp(smtp_command,"end ",4) != 0)) && |
| 1691 | (save_errno != ERRNO_SMTPCLOSED || |
| 1692 | Ustrncmp(smtp_command,"end ",4) != 0)) |
| 1693 | { |
| 1694 | yield = (save_errno == ERRNO_CHHEADER_FAIL || |
| 1695 | save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER; |
| 1696 | set_errno(addrlist, save_errno, message, DEFER, pass_message); |
| 1697 | } |
| 1698 | |
| 1699 | /* Otherwise we have a message-specific error response from the remote |
| 1700 | host. This is one of |
| 1701 | (a) negative response or timeout after "mail from" |
| 1702 | (b) negative response after "data" |
| 1703 | (c) negative response or timeout or dropped connection after "." |
| 1704 | It won't be a negative response or timeout after "rcpt to", as that is dealt |
| 1705 | with separately above. The action in all cases is to set an appropriate |
| 1706 | error code for all the addresses, but to leave yield set to OK because |
| 1707 | the host itself has not failed. [It might in practice have failed for a |
| 1708 | timeout after MAIL FROM, or "." but if so, we'll discover that at the next |
| 1709 | delivery attempt.] For a temporary error, set the message_defer flag, and |
| 1710 | write to the logs for information if this is not the last host. The error for |
| 1711 | the last host will be logged as part of the address's log line. */ |
| 1712 | |
| 1713 | else |
| 1714 | { |
| 1715 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ |
| 1716 | |
| 1717 | set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER, |
| 1718 | pass_message); |
| 1719 | |
| 1720 | /* If there's an errno, the message contains just the identity of |
| 1721 | the host. */ |
| 1722 | |
| 1723 | if (code != '5') /* Anything other than 5 is treated as temporary */ |
| 1724 | { |
| 1725 | if (save_errno > 0) |
| 1726 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); |
| 1727 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message); |
| 1728 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); |
| 1729 | *message_defer = TRUE; |
| 1730 | } |
| 1731 | } |
| 1732 | } |
| 1733 | |
| 1734 | |
| 1735 | /* If all has gone well, send_quit will be set TRUE, implying we can end the |
| 1736 | SMTP session tidily. However, if there were too many addresses to send in one |
| 1737 | message (indicated by first_addr being non-NULL) we want to carry on with the |
| 1738 | rest of them. Also, it is desirable to send more than one message down the SMTP |
| 1739 | connection if there are several waiting, provided we haven't already sent so |
| 1740 | many as to hit the configured limit. The function transport_check_waiting looks |
| 1741 | for a waiting message and returns its id. Then transport_pass_socket tries to |
| 1742 | set up a continued delivery by passing the socket on to another process. The |
| 1743 | variable send_rset is FALSE if a message has just been successfully transfered. |
| 1744 | |
| 1745 | If we are already sending down a continued channel, there may be further |
| 1746 | addresses not yet delivered that are aimed at the same host, but which have not |
| 1747 | been passed in this run of the transport. In this case, continue_more will be |
| 1748 | true, and all we should do is send RSET if necessary, and return, leaving the |
| 1749 | channel open. |
| 1750 | |
| 1751 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we |
| 1752 | do not want to continue with other messages down the same channel, because that |
| 1753 | can lead to looping between two or more messages, all with the same, |
| 1754 | temporarily failing address(es). [The retry information isn't updated yet, so |
| 1755 | new processes keep on trying.] We probably also don't want to try more of this |
| 1756 | message's addresses either. |
| 1757 | |
| 1758 | If we have started a TLS session, we have to end it before passing the |
| 1759 | connection to a new process. However, not all servers can handle this (Exim |
| 1760 | can), so we do not pass such a connection on if the host matches |
| 1761 | hosts_nopass_tls. */ |
| 1762 | |
| 1763 | DEBUG(D_transport) |
| 1764 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " |
| 1765 | "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset, |
| 1766 | continue_more, yield, (first_addr == NULL)? "":"not "); |
| 1767 | |
| 1768 | if (completed_address && ok && send_quit) |
| 1769 | { |
| 1770 | BOOL more; |
| 1771 | if (first_addr != NULL || continue_more || |
| 1772 | ( |
| 1773 | (tls_active < 0 || |
| 1774 | verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name, |
| 1775 | host->address, NULL) != OK) |
| 1776 | && |
| 1777 | transport_check_waiting(tblock->name, host->name, |
| 1778 | tblock->connection_max_messages, new_message_id, &more) |
| 1779 | )) |
| 1780 | { |
| 1781 | uschar *msg; |
| 1782 | BOOL pass_message; |
| 1783 | |
| 1784 | if (send_rset) |
| 1785 | { |
| 1786 | if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0)) |
| 1787 | { |
| 1788 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, |
| 1789 | host->address, strerror(save_errno)); |
| 1790 | send_quit = FALSE; |
| 1791 | } |
| 1792 | else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1793 | ob->command_timeout))) |
| 1794 | { |
| 1795 | int code; |
| 1796 | send_quit = check_response(host, &errno, 0, buffer, &code, &msg, |
| 1797 | &pass_message); |
| 1798 | if (!send_quit) |
| 1799 | { |
| 1800 | DEBUG(D_transport) debug_printf("%s\n", msg); |
| 1801 | } |
| 1802 | } |
| 1803 | } |
| 1804 | |
| 1805 | /* Either RSET was not needed, or it succeeded */ |
| 1806 | |
| 1807 | if (ok) |
| 1808 | { |
| 1809 | if (first_addr != NULL) /* More addresses still to be sent */ |
| 1810 | { /* in this run of the transport */ |
| 1811 | continue_sequence++; /* Causes * in logging */ |
| 1812 | goto SEND_MESSAGE; |
| 1813 | } |
| 1814 | if (continue_more) return yield; /* More addresses for another run */ |
| 1815 | |
| 1816 | /* Pass the socket to a new Exim process. Before doing so, we must shut |
| 1817 | down TLS. Not all MTAs allow for the continuation of the SMTP session |
| 1818 | when TLS is shut down. We test for this by sending a new EHLO. If we |
| 1819 | don't get a good response, we don't attempt to pass the socket on. */ |
| 1820 | |
| 1821 | #ifdef SUPPORT_TLS |
| 1822 | if (tls_active >= 0) |
| 1823 | { |
| 1824 | tls_close(TRUE); |
| 1825 | ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 && |
| 1826 | smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1827 | ob->command_timeout); |
| 1828 | } |
| 1829 | #endif |
| 1830 | |
| 1831 | /* If the socket is successfully passed, we musn't send QUIT (or |
| 1832 | indeed anything!) from here. */ |
| 1833 | |
| 1834 | if (ok && transport_pass_socket(tblock->name, host->name, host->address, |
| 1835 | new_message_id, inblock.sock)) |
| 1836 | { |
| 1837 | send_quit = FALSE; |
| 1838 | } |
| 1839 | } |
| 1840 | |
| 1841 | /* If RSET failed and there are addresses left, they get deferred. */ |
| 1842 | |
| 1843 | else set_errno(first_addr, errno, msg, DEFER, FALSE); |
| 1844 | } |
| 1845 | } |
| 1846 | |
| 1847 | /* End off tidily with QUIT unless the connection has died or the socket has |
| 1848 | been passed to another process. There has been discussion on the net about what |
| 1849 | to do after sending QUIT. The wording of the RFC suggests that it is necessary |
| 1850 | to wait for a response, but on the other hand, there isn't anything one can do |
| 1851 | with an error response, other than log it. Exim used to do that. However, |
| 1852 | further discussion suggested that it is positively advantageous not to wait for |
| 1853 | the response, but to close the session immediately. This is supposed to move |
| 1854 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some |
| 1855 | load from the server. (Hosts that are both servers and clients may not see much |
| 1856 | difference, of course.) Further discussion indicated that this was safe to do |
| 1857 | on Unix systems which have decent implementations of TCP/IP that leave the |
| 1858 | connection around for a while (TIME_WAIT) after the application has gone away. |
| 1859 | This enables the response sent by the server to be properly ACKed rather than |
| 1860 | timed out, as can happen on broken TCP/IP implementations on other OS. |
| 1861 | |
| 1862 | This change is being made on 31-Jul-98. After over a year of trouble-free |
| 1863 | operation, the old commented-out code was removed on 17-Sep-99. */ |
| 1864 | |
| 1865 | SEND_QUIT: |
| 1866 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); |
| 1867 | |
| 1868 | END_OFF: |
| 1869 | |
| 1870 | #ifdef SUPPORT_TLS |
| 1871 | tls_close(TRUE); |
| 1872 | #endif |
| 1873 | |
| 1874 | /* Close the socket, and return the appropriate value, first setting |
| 1875 | continue_transport and continue_hostname NULL to prevent any other addresses |
| 1876 | that may include the host from trying to re-use a continuation socket. This |
| 1877 | works because the NULL setting is passed back to the calling process, and |
| 1878 | remote_max_parallel is forced to 1 when delivering over an existing connection, |
| 1879 | |
| 1880 | If all went well and continue_more is set, we shouldn't actually get here if |
| 1881 | there are further addresses, as the return above will be taken. However, |
| 1882 | writing RSET might have failed, or there may be other addresses whose hosts are |
| 1883 | specified in the transports, and therefore not visible at top level, in which |
| 1884 | case continue_more won't get set. */ |
| 1885 | |
| 1886 | (void)close(inblock.sock); |
| 1887 | continue_transport = NULL; |
| 1888 | continue_hostname = NULL; |
| 1889 | return yield; |
| 1890 | } |
| 1891 | |
| 1892 | |
| 1893 | |
| 1894 | |
| 1895 | /************************************************* |
| 1896 | * Closedown entry point * |
| 1897 | *************************************************/ |
| 1898 | |
| 1899 | /* This function is called when exim is passed an open smtp channel |
| 1900 | from another incarnation, but the message which it has been asked |
| 1901 | to deliver no longer exists. The channel is on stdin. |
| 1902 | |
| 1903 | We might do fancy things like looking for another message to send down |
| 1904 | the channel, but if the one we sought has gone, it has probably been |
| 1905 | delivered by some other process that itself will seek further messages, |
| 1906 | so just close down our connection. |
| 1907 | |
| 1908 | Argument: pointer to the transport instance block |
| 1909 | Returns: nothing |
| 1910 | */ |
| 1911 | |
| 1912 | void |
| 1913 | smtp_transport_closedown(transport_instance *tblock) |
| 1914 | { |
| 1915 | smtp_transport_options_block *ob = |
| 1916 | (smtp_transport_options_block *)(tblock->options_block); |
| 1917 | smtp_inblock inblock; |
| 1918 | smtp_outblock outblock; |
| 1919 | uschar buffer[256]; |
| 1920 | uschar inbuffer[4096]; |
| 1921 | uschar outbuffer[16]; |
| 1922 | |
| 1923 | inblock.sock = fileno(stdin); |
| 1924 | inblock.buffer = inbuffer; |
| 1925 | inblock.buffersize = sizeof(inbuffer); |
| 1926 | inblock.ptr = inbuffer; |
| 1927 | inblock.ptrend = inbuffer; |
| 1928 | |
| 1929 | outblock.sock = inblock.sock; |
| 1930 | outblock.buffersize = sizeof(outbuffer); |
| 1931 | outblock.buffer = outbuffer; |
| 1932 | outblock.ptr = outbuffer; |
| 1933 | outblock.cmd_count = 0; |
| 1934 | outblock.authenticating = FALSE; |
| 1935 | |
| 1936 | (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); |
| 1937 | (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 1938 | ob->command_timeout); |
| 1939 | (void)close(inblock.sock); |
| 1940 | } |
| 1941 | |
| 1942 | |
| 1943 | |
| 1944 | /************************************************* |
| 1945 | * Prepare addresses for delivery * |
| 1946 | *************************************************/ |
| 1947 | |
| 1948 | /* This function is called to flush out error settings from previous delivery |
| 1949 | attempts to other hosts. It also records whether we got here via an MX record |
| 1950 | or not in the more_errno field of the address. We are interested only in |
| 1951 | addresses that are still marked DEFER - others may have got delivered to a |
| 1952 | previously considered IP address. Set their status to PENDING_DEFER to indicate |
| 1953 | which ones are relevant this time. |
| 1954 | |
| 1955 | Arguments: |
| 1956 | addrlist the list of addresses |
| 1957 | host the host we are delivering to |
| 1958 | |
| 1959 | Returns: the first address for this delivery |
| 1960 | */ |
| 1961 | |
| 1962 | static address_item * |
| 1963 | prepare_addresses(address_item *addrlist, host_item *host) |
| 1964 | { |
| 1965 | address_item *first_addr = NULL; |
| 1966 | address_item *addr; |
| 1967 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 1968 | { |
| 1969 | if (addr->transport_return != DEFER) continue; |
| 1970 | if (first_addr == NULL) first_addr = addr; |
| 1971 | addr->transport_return = PENDING_DEFER; |
| 1972 | addr->basic_errno = 0; |
| 1973 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; |
| 1974 | addr->message = NULL; |
| 1975 | #ifdef SUPPORT_TLS |
| 1976 | addr->cipher = NULL; |
| 1977 | addr->peerdn = NULL; |
| 1978 | #endif |
| 1979 | } |
| 1980 | return first_addr; |
| 1981 | } |
| 1982 | |
| 1983 | |
| 1984 | |
| 1985 | /************************************************* |
| 1986 | * Main entry point * |
| 1987 | *************************************************/ |
| 1988 | |
| 1989 | /* See local README for interface details. As this is a remote transport, it is |
| 1990 | given a chain of addresses to be delivered in one connection, if possible. It |
| 1991 | always returns TRUE, indicating that each address has its own independent |
| 1992 | status set, except if there is a setting up problem, in which case it returns |
| 1993 | FALSE. */ |
| 1994 | |
| 1995 | BOOL |
| 1996 | smtp_transport_entry( |
| 1997 | transport_instance *tblock, /* data for this instantiation */ |
| 1998 | address_item *addrlist) /* addresses we are working on */ |
| 1999 | { |
| 2000 | int cutoff_retry; |
| 2001 | int port; |
| 2002 | int hosts_defer = 0; |
| 2003 | int hosts_fail = 0; |
| 2004 | int hosts_looked_up = 0; |
| 2005 | int hosts_retry = 0; |
| 2006 | int hosts_serial = 0; |
| 2007 | int hosts_total = 0; |
| 2008 | int total_hosts_tried = 0; |
| 2009 | address_item *addr; |
| 2010 | BOOL expired = TRUE; |
| 2011 | BOOL continuing = continue_hostname != NULL; |
| 2012 | uschar *expanded_hosts = NULL; |
| 2013 | uschar *pistring; |
| 2014 | uschar *tid = string_sprintf("%s transport", tblock->name); |
| 2015 | smtp_transport_options_block *ob = |
| 2016 | (smtp_transport_options_block *)(tblock->options_block); |
| 2017 | host_item *hostlist = addrlist->host_list; |
| 2018 | host_item *host = NULL; |
| 2019 | |
| 2020 | DEBUG(D_transport) |
| 2021 | { |
| 2022 | debug_printf("%s transport entered\n", tblock->name); |
| 2023 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2024 | debug_printf(" %s\n", addr->address); |
| 2025 | if (continuing) debug_printf("already connected to %s [%s]\n", |
| 2026 | continue_hostname, continue_host_address); |
| 2027 | } |
| 2028 | |
| 2029 | /* If a host list is not defined for the addresses - they must all have the |
| 2030 | same one in order to be passed to a single transport - or if the transport has |
| 2031 | a host list with hosts_override set, use the host list supplied with the |
| 2032 | transport. It is an error for this not to exist. */ |
| 2033 | |
| 2034 | if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL)) |
| 2035 | { |
| 2036 | if (ob->hosts == NULL) |
| 2037 | { |
| 2038 | addrlist->message = string_sprintf("%s transport called with no hosts set", |
| 2039 | tblock->name); |
| 2040 | addrlist->transport_return = PANIC; |
| 2041 | return FALSE; /* Only top address has status */ |
| 2042 | } |
| 2043 | |
| 2044 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", |
| 2045 | ob->hosts); |
| 2046 | |
| 2047 | /* If the transport's host list contains no '$' characters, and we are not |
| 2048 | randomizing, it is fixed and therefore a chain of hosts can be built once |
| 2049 | and for all, and remembered for subsequent use by other calls to this |
| 2050 | transport. If, on the other hand, the host list does contain '$', or we are |
| 2051 | randomizing its order, we have to rebuild it each time. In the fixed case, |
| 2052 | as the hosts string will never be used again, it doesn't matter that we |
| 2053 | replace all the : characters with zeros. */ |
| 2054 | |
| 2055 | if (ob->hostlist == NULL) |
| 2056 | { |
| 2057 | uschar *s = ob->hosts; |
| 2058 | |
| 2059 | if (Ustrchr(s, '$') != NULL) |
| 2060 | { |
| 2061 | expanded_hosts = expand_string(s); |
| 2062 | if (expanded_hosts == NULL) |
| 2063 | { |
| 2064 | addrlist->message = string_sprintf("failed to expand list of hosts " |
| 2065 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); |
| 2066 | addrlist->transport_return = search_find_defer? DEFER : PANIC; |
| 2067 | return FALSE; /* Only top address has status */ |
| 2068 | } |
| 2069 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " |
| 2070 | "\"%s\"\n", s, expanded_hosts); |
| 2071 | s = expanded_hosts; |
| 2072 | } |
| 2073 | else |
| 2074 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); |
| 2075 | |
| 2076 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); |
| 2077 | |
| 2078 | /* If there was no expansion of hosts, save the host list for |
| 2079 | next time. */ |
| 2080 | |
| 2081 | if (expanded_hosts == NULL) ob->hostlist = hostlist; |
| 2082 | } |
| 2083 | |
| 2084 | /* This is not the first time this transport has been run in this delivery; |
| 2085 | the host list was built previously. */ |
| 2086 | |
| 2087 | else hostlist = ob->hostlist; |
| 2088 | } |
| 2089 | |
| 2090 | /* The host list was supplied with the address. If hosts_randomize is set, we |
| 2091 | must sort it into a random order if it did not come from MX records and has not |
| 2092 | already been randomized (but don't bother if continuing down an existing |
| 2093 | connection). */ |
| 2094 | |
| 2095 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing) |
| 2096 | { |
| 2097 | host_item *newlist = NULL; |
| 2098 | while (hostlist != NULL) |
| 2099 | { |
| 2100 | host_item *h = hostlist; |
| 2101 | hostlist = hostlist->next; |
| 2102 | |
| 2103 | h->sort_key = random_number(100); |
| 2104 | |
| 2105 | if (newlist == NULL) |
| 2106 | { |
| 2107 | h->next = NULL; |
| 2108 | newlist = h; |
| 2109 | } |
| 2110 | else if (h->sort_key < newlist->sort_key) |
| 2111 | { |
| 2112 | h->next = newlist; |
| 2113 | newlist = h; |
| 2114 | } |
| 2115 | else |
| 2116 | { |
| 2117 | host_item *hh = newlist; |
| 2118 | while (hh->next != NULL) |
| 2119 | { |
| 2120 | if (h->sort_key < hh->next->sort_key) break; |
| 2121 | hh = hh->next; |
| 2122 | } |
| 2123 | h->next = hh->next; |
| 2124 | hh->next = h; |
| 2125 | } |
| 2126 | } |
| 2127 | |
| 2128 | hostlist = addrlist->host_list = newlist; |
| 2129 | } |
| 2130 | |
| 2131 | |
| 2132 | /* Sort out the default port. */ |
| 2133 | |
| 2134 | if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE; |
| 2135 | |
| 2136 | |
| 2137 | /* For each host-plus-IP-address on the list: |
| 2138 | |
| 2139 | . If this is a continued delivery and the host isn't the one with the |
| 2140 | current connection, skip. |
| 2141 | |
| 2142 | . If the status is unusable (i.e. previously failed or retry checked), skip. |
| 2143 | |
| 2144 | . If no IP address set, get the address, either by turning the name into |
| 2145 | an address, calling gethostbyname if gethostbyname is on, or by calling |
| 2146 | the DNS. The DNS may yield multiple addresses, in which case insert the |
| 2147 | extra ones into the list. |
| 2148 | |
| 2149 | . Get the retry data if not previously obtained for this address and set the |
| 2150 | field which remembers the state of this address. Skip if the retry time is |
| 2151 | not reached. If not, remember whether retry data was found. The retry string |
| 2152 | contains both the name and the IP address. |
| 2153 | |
| 2154 | . Scan the list of addresses and mark those whose status is DEFER as |
| 2155 | PENDING_DEFER. These are the only ones that will be processed in this cycle |
| 2156 | of the hosts loop. |
| 2157 | |
| 2158 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. |
| 2159 | Some addresses may be successfully delivered, others may fail, and yet |
| 2160 | others may get temporary errors and so get marked DEFER. |
| 2161 | |
| 2162 | . The return from the delivery attempt is OK if a connection was made and a |
| 2163 | valid SMTP dialogue was completed. Otherwise it is DEFER. |
| 2164 | |
| 2165 | . If OK, add a "remove" retry item for this host/IPaddress, if any. |
| 2166 | |
| 2167 | . If fail to connect, or other defer state, add a retry item. |
| 2168 | |
| 2169 | . If there are any addresses whose status is still DEFER, carry on to the |
| 2170 | next host/IPaddress, unless we have tried the number of hosts given |
| 2171 | by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that |
| 2172 | there is some fancy logic for hosts_max_try that means its limit can be |
| 2173 | overstepped in some circumstances. |
| 2174 | |
| 2175 | If we get to the end of the list, all hosts have deferred at least one address, |
| 2176 | or not reached their retry times. If delay_after_cutoff is unset, it requests a |
| 2177 | delivery attempt to those hosts whose last try was before the arrival time of |
| 2178 | the current message. To cope with this, we have to go round the loop a second |
| 2179 | time. After that, set the status and error data for any addresses that haven't |
| 2180 | had it set already. */ |
| 2181 | |
| 2182 | for (cutoff_retry = 0; expired && |
| 2183 | cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2); |
| 2184 | cutoff_retry++) |
| 2185 | { |
| 2186 | host_item *nexthost = NULL; |
| 2187 | int unexpired_hosts_tried = 0; |
| 2188 | |
| 2189 | for (host = hostlist; |
| 2190 | host != NULL && |
| 2191 | unexpired_hosts_tried < ob->hosts_max_try && |
| 2192 | total_hosts_tried < ob->hosts_max_try_hardlimit; |
| 2193 | host = nexthost) |
| 2194 | { |
| 2195 | int rc; |
| 2196 | int host_af; |
| 2197 | uschar *rs; |
| 2198 | BOOL serialized = FALSE; |
| 2199 | BOOL host_is_expired = FALSE; |
| 2200 | BOOL message_defer = FALSE; |
| 2201 | BOOL ifchanges = FALSE; |
| 2202 | BOOL some_deferred = FALSE; |
| 2203 | address_item *first_addr = NULL; |
| 2204 | uschar *interface = NULL; |
| 2205 | uschar *retry_host_key = NULL; |
| 2206 | uschar *retry_message_key = NULL; |
| 2207 | uschar *serialize_key = NULL; |
| 2208 | |
| 2209 | /* Default next host is next host. :-) But this can vary if the |
| 2210 | hosts_max_try limit is hit (see below). It may also be reset if a host |
| 2211 | address is looked up here (in case the host was multihomed). */ |
| 2212 | |
| 2213 | nexthost = host->next; |
| 2214 | |
| 2215 | /* Set the flag requesting that this host be added to the waiting |
| 2216 | database if the delivery fails temporarily or if we are running with |
| 2217 | queue_smtp or a 2-stage queue run. This gets unset for certain |
| 2218 | kinds of error, typically those that are specific to the message. */ |
| 2219 | |
| 2220 | host->update_waiting = TRUE; |
| 2221 | |
| 2222 | /* If the address hasn't yet been obtained from the host name, look it up |
| 2223 | now, unless the host is already marked as unusable. If it is marked as |
| 2224 | unusable, it means that the router was unable to find its IP address (in |
| 2225 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and |
| 2226 | the lookup failed last time. We don't get this far if *all* MX records |
| 2227 | point to non-existent hosts; that is treated as a hard error. |
| 2228 | |
| 2229 | We can just skip this host entirely. When the hosts came from the router, |
| 2230 | the address will timeout based on the other host(s); when the address is |
| 2231 | looked up below, there is an explicit retry record added. |
| 2232 | |
| 2233 | Note that we mustn't skip unusable hosts if the address is not unset; they |
| 2234 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ |
| 2235 | |
| 2236 | if (host->address == NULL) |
| 2237 | { |
| 2238 | int new_port; |
| 2239 | host_item *hh; |
| 2240 | uschar *canonical_name; |
| 2241 | |
| 2242 | if (host->status >= hstatus_unusable) |
| 2243 | { |
| 2244 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", |
| 2245 | host->name); |
| 2246 | continue; |
| 2247 | } |
| 2248 | |
| 2249 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); |
| 2250 | |
| 2251 | /* The host name is permitted to have an attached port. Find it, and |
| 2252 | strip it from the name. Just remember it for now. */ |
| 2253 | |
| 2254 | new_port = host_item_get_port(host); |
| 2255 | |
| 2256 | /* Count hosts looked up */ |
| 2257 | |
| 2258 | hosts_looked_up++; |
| 2259 | |
| 2260 | /* Find by name if so configured, or if it's an IP address. We don't |
| 2261 | just copy the IP address, because we need the test-for-local to happen. */ |
| 2262 | |
| 2263 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL) > 0) |
| 2264 | rc = host_find_byname(host, NULL, &canonical_name, TRUE); |
| 2265 | else |
| 2266 | { |
| 2267 | int flags = HOST_FIND_BY_A; |
| 2268 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; |
| 2269 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; |
| 2270 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
| 2271 | &canonical_name, NULL); |
| 2272 | } |
| 2273 | |
| 2274 | /* Update the host (and any additional blocks, resulting from |
| 2275 | multihoming) with a host-specific port, if any. */ |
| 2276 | |
| 2277 | for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port; |
| 2278 | |
| 2279 | /* Failure to find the host at this time (usually DNS temporary failure) |
| 2280 | is really a kind of routing failure rather than a transport failure. |
| 2281 | Therefore we add a retry item of the routing kind, not to stop us trying |
| 2282 | to look this name up here again, but to ensure the address gets timed |
| 2283 | out if the failures go on long enough. A complete failure at this point |
| 2284 | commonly points to a configuration error, but the best action is still |
| 2285 | to carry on for the next host. */ |
| 2286 | |
| 2287 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED) |
| 2288 | { |
| 2289 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); |
| 2290 | expired = FALSE; |
| 2291 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; |
| 2292 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? |
| 2293 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); |
| 2294 | host->status = hstatus_unusable; |
| 2295 | |
| 2296 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2297 | { |
| 2298 | if (addr->transport_return != DEFER) continue; |
| 2299 | addr->basic_errno = ERRNO_UNKNOWNHOST; |
| 2300 | addr->message = |
| 2301 | string_sprintf("failed to lookup IP address for %s", host->name); |
| 2302 | } |
| 2303 | continue; |
| 2304 | } |
| 2305 | |
| 2306 | /* If the host is actually the local host, we may have a problem, or |
| 2307 | there may be some cunning configuration going on. In the problem case, |
| 2308 | log things and give up. The default transport status is already DEFER. */ |
| 2309 | |
| 2310 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) |
| 2311 | { |
| 2312 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2313 | { |
| 2314 | addr->basic_errno = 0; |
| 2315 | addr->message = string_sprintf("%s transport found host %s to be " |
| 2316 | "local", tblock->name, host->name); |
| 2317 | } |
| 2318 | goto END_TRANSPORT; |
| 2319 | } |
| 2320 | } /* End of block for IP address lookup */ |
| 2321 | |
| 2322 | /* If this is a continued delivery, we are interested only in the host |
| 2323 | which matches the name of the existing open channel. The check is put |
| 2324 | here after the local host lookup, in case the name gets expanded as a |
| 2325 | result of the lookup. Set expired FALSE, to save the outer loop executing |
| 2326 | twice. */ |
| 2327 | |
| 2328 | if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 || |
| 2329 | Ustrcmp(continue_host_address, host->address) != 0)) |
| 2330 | { |
| 2331 | expired = FALSE; |
| 2332 | continue; /* With next host */ |
| 2333 | } |
| 2334 | |
| 2335 | /* Reset the default next host in case a multihomed host whose addresses |
| 2336 | are not looked up till just above added to the host list. */ |
| 2337 | |
| 2338 | nexthost = host->next; |
| 2339 | |
| 2340 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the |
| 2341 | domain is in queue_smtp_domains, we don't actually want to attempt any |
| 2342 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If |
| 2343 | there is a lookup defer in queue_smtp_domains, proceed as if the domain |
| 2344 | were not in it. We don't want to hold up all SMTP deliveries! Except when |
| 2345 | doing a two-stage queue run, don't do this if forcing. */ |
| 2346 | |
| 2347 | if ((!deliver_force || queue_2stage) && (queue_smtp || |
| 2348 | match_isinlist(addrlist->domain, &queue_smtp_domains, 0, |
| 2349 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)) |
| 2350 | { |
| 2351 | expired = FALSE; |
| 2352 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2353 | { |
| 2354 | if (addr->transport_return != DEFER) continue; |
| 2355 | addr->message = US"domain matches queue_smtp_domains, or -odqs set"; |
| 2356 | } |
| 2357 | continue; /* With next host */ |
| 2358 | } |
| 2359 | |
| 2360 | /* Count hosts being considered - purely for an intelligent comment |
| 2361 | if none are usable. */ |
| 2362 | |
| 2363 | hosts_total++; |
| 2364 | |
| 2365 | /* Set $host and $host address now in case they are needed for the |
| 2366 | interface expansion or the serialize_hosts check; they remain set if an |
| 2367 | actual delivery happens. */ |
| 2368 | |
| 2369 | deliver_host = host->name; |
| 2370 | deliver_host_address = host->address; |
| 2371 | |
| 2372 | /* Set up a string for adding to the retry key if the port number is not |
| 2373 | the standard SMTP port. A host may have its own port setting that overrides |
| 2374 | the default. */ |
| 2375 | |
| 2376 | pistring = string_sprintf(":%d", (host->port == PORT_NONE)? |
| 2377 | port : host->port); |
| 2378 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; |
| 2379 | |
| 2380 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface |
| 2381 | string changes upon expansion, we must add it to the key that is used for |
| 2382 | retries, because connections to the same host from a different interface |
| 2383 | should be treated separately. */ |
| 2384 | |
| 2385 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6; |
| 2386 | if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges, |
| 2387 | &interface, tid)) |
| 2388 | return FALSE; |
| 2389 | if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface); |
| 2390 | |
| 2391 | /* The first time round the outer loop, check the status of the host by |
| 2392 | inspecting the retry data. The second time round, we are interested only |
| 2393 | in expired hosts that haven't been tried since this message arrived. */ |
| 2394 | |
| 2395 | if (cutoff_retry == 0) |
| 2396 | { |
| 2397 | /* Ensure the status of the address is set by checking retry data if |
| 2398 | necessary. There maybe host-specific retry data (applicable to all |
| 2399 | messages) and also data for retries of a specific message at this host. |
| 2400 | If either of these retry records are actually read, the keys used are |
| 2401 | returned to save recomputing them later. */ |
| 2402 | |
| 2403 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, |
| 2404 | ob->retry_include_ip_address, &retry_host_key, &retry_message_key); |
| 2405 | |
| 2406 | DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name, |
| 2407 | (host->address == NULL)? US"" : host->address, pistring, |
| 2408 | (host->status == hstatus_usable)? "usable" : |
| 2409 | (host->status == hstatus_unusable)? "unusable" : |
| 2410 | (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?"); |
| 2411 | |
| 2412 | /* Skip this address if not usable at this time, noting if it wasn't |
| 2413 | actually expired, both locally and in the address. */ |
| 2414 | |
| 2415 | switch (host->status) |
| 2416 | { |
| 2417 | case hstatus_unusable: |
| 2418 | expired = FALSE; |
| 2419 | setflag(addrlist, af_retry_skipped); |
| 2420 | /* Fall through */ |
| 2421 | |
| 2422 | case hstatus_unusable_expired: |
| 2423 | switch (host->why) |
| 2424 | { |
| 2425 | case hwhy_retry: hosts_retry++; break; |
| 2426 | case hwhy_failed: hosts_fail++; break; |
| 2427 | case hwhy_deferred: hosts_defer++; break; |
| 2428 | } |
| 2429 | |
| 2430 | /* If there was a retry message key, implying that previously there |
| 2431 | was a message-specific defer, we don't want to update the list of |
| 2432 | messages waiting for this host. */ |
| 2433 | |
| 2434 | if (retry_message_key != NULL) host->update_waiting = FALSE; |
| 2435 | continue; /* With the next host or IP address */ |
| 2436 | } |
| 2437 | } |
| 2438 | |
| 2439 | /* Second time round the loop: if the address is set but expired, and |
| 2440 | the message is newer than the last try, let it through. */ |
| 2441 | |
| 2442 | else |
| 2443 | { |
| 2444 | if (host->address == NULL || |
| 2445 | host->status != hstatus_unusable_expired || |
| 2446 | host->last_try > received_time) |
| 2447 | continue; |
| 2448 | DEBUG(D_transport) |
| 2449 | debug_printf("trying expired host %s [%s]%s\n", |
| 2450 | host->name, host->address, pistring); |
| 2451 | host_is_expired = TRUE; |
| 2452 | } |
| 2453 | |
| 2454 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; |
| 2455 | it remains TRUE only if all hosts are expired and none are actually tried. |
| 2456 | */ |
| 2457 | |
| 2458 | expired = FALSE; |
| 2459 | |
| 2460 | /* If this host is listed as one to which access must be serialized, |
| 2461 | see if another Exim process has a connection to it, and if so, skip |
| 2462 | this host. If not, update the database to record our connection to it |
| 2463 | and remember this for later deletion. Do not do any of this if we are |
| 2464 | sending the message down a pre-existing connection. */ |
| 2465 | |
| 2466 | if (!continuing && |
| 2467 | verify_check_this_host(&(ob->serialize_hosts), NULL, host->name, |
| 2468 | host->address, NULL) == OK) |
| 2469 | { |
| 2470 | serialize_key = string_sprintf("host-serialize-%s", host->name); |
| 2471 | if (!enq_start(serialize_key)) |
| 2472 | { |
| 2473 | DEBUG(D_transport) |
| 2474 | debug_printf("skipping host %s because another Exim process " |
| 2475 | "is connected to it\n", host->name); |
| 2476 | hosts_serial++; |
| 2477 | continue; |
| 2478 | } |
| 2479 | serialized = TRUE; |
| 2480 | } |
| 2481 | |
| 2482 | /* OK, we have an IP address that is not waiting for its retry time to |
| 2483 | arrive (it might be expired) OR (second time round the loop) we have an |
| 2484 | expired host that hasn't been tried since the message arrived. Have a go |
| 2485 | at delivering the message to it. First prepare the addresses by flushing |
| 2486 | out the result of previous attempts, and finding the first address that |
| 2487 | is still to be delivered. */ |
| 2488 | |
| 2489 | first_addr = prepare_addresses(addrlist, host); |
| 2490 | |
| 2491 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", |
| 2492 | message_id, host->name, host->address, addrlist->address, |
| 2493 | (addrlist->next == NULL)? "" : ", ..."); |
| 2494 | |
| 2495 | set_process_info("delivering %s to %s [%s] (%s%s)", |
| 2496 | message_id, host->name, host->address, addrlist->address, |
| 2497 | (addrlist->next == NULL)? "" : ", ..."); |
| 2498 | |
| 2499 | /* This is not for real; don't do the delivery. If there are |
| 2500 | any remaining hosts, list them. */ |
| 2501 | |
| 2502 | if (dont_deliver) |
| 2503 | { |
| 2504 | host_item *host2; |
| 2505 | set_errno(addrlist, 0, NULL, OK, FALSE); |
| 2506 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2507 | { |
| 2508 | addr->host_used = host; |
| 2509 | addr->special_action = '*'; |
| 2510 | addr->message = US"delivery bypassed by -N option"; |
| 2511 | } |
| 2512 | DEBUG(D_transport) |
| 2513 | { |
| 2514 | debug_printf("*** delivery by %s transport bypassed by -N option\n" |
| 2515 | "*** host and remaining hosts:\n", tblock->name); |
| 2516 | for (host2 = host; host2 != NULL; host2 = host2->next) |
| 2517 | debug_printf(" %s [%s]\n", host2->name, |
| 2518 | (host2->address == NULL)? US"unset" : host2->address); |
| 2519 | } |
| 2520 | rc = OK; |
| 2521 | } |
| 2522 | |
| 2523 | /* This is for real. If the host is expired, we don't count it for |
| 2524 | hosts_max_retry. This ensures that all hosts must expire before an address |
| 2525 | is timed out, unless hosts_max_try_hardlimit (which protects against |
| 2526 | lunatic DNS configurations) is reached. |
| 2527 | |
| 2528 | If the host is not expired and we are about to hit the hosts_max_retry |
| 2529 | limit, check to see if there is a subsequent hosts with a different MX |
| 2530 | value. If so, make that the next host, and don't count this one. This is a |
| 2531 | heuristic to make sure that different MXs do get tried. With a normal kind |
| 2532 | of retry rule, they would get tried anyway when the earlier hosts were |
| 2533 | delayed, but if the domain has a "retry every time" type of rule - as is |
| 2534 | often used for the the very large ISPs, that won't happen. */ |
| 2535 | |
| 2536 | else |
| 2537 | { |
| 2538 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) |
| 2539 | { |
| 2540 | host_item *h; |
| 2541 | DEBUG(D_transport) |
| 2542 | debug_printf("hosts_max_try limit reached with this host\n"); |
| 2543 | for (h = host; h != NULL; h = h->next) |
| 2544 | if (h->mx != host->mx) break; |
| 2545 | if (h != NULL) |
| 2546 | { |
| 2547 | nexthost = h; |
| 2548 | unexpired_hosts_tried--; |
| 2549 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " |
| 2550 | "and will be tried\n"); |
| 2551 | } |
| 2552 | } |
| 2553 | |
| 2554 | /* Attempt the delivery. */ |
| 2555 | |
| 2556 | total_hosts_tried++; |
| 2557 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, |
| 2558 | expanded_hosts != NULL, &message_defer, FALSE); |
| 2559 | |
| 2560 | /* Yield is one of: |
| 2561 | OK => connection made, each address contains its result; |
| 2562 | message_defer is set for message-specific defers (when all |
| 2563 | recipients are marked defer) |
| 2564 | DEFER => there was a non-message-specific delivery problem; |
| 2565 | ERROR => there was a problem setting up the arguments for a filter, |
| 2566 | or there was a problem with expanding added headers |
| 2567 | */ |
| 2568 | |
| 2569 | /* If the result is not OK, there was a non-message-specific problem. |
| 2570 | If the result is DEFER, we need to write to the logs saying what happened |
| 2571 | for this particular host, except in the case of authentication and TLS |
| 2572 | failures, where the log has already been written. If all hosts defer a |
| 2573 | general message is written at the end. */ |
| 2574 | |
| 2575 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL && |
| 2576 | first_addr->basic_errno != ERRNO_TLSFAILURE) |
| 2577 | write_logs(first_addr, host); |
| 2578 | |
| 2579 | /* If STARTTLS was accepted, but there was a failure in setting up the |
| 2580 | TLS session (usually a certificate screwup), and the host is not in |
| 2581 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with |
| 2582 | TLS forcibly turned off. We have to start from scratch with a new SMTP |
| 2583 | connection. That's why the retry is done from here, not from within |
| 2584 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the |
| 2585 | session, so the in-clear transmission after those errors, if permitted, |
| 2586 | happens inside smtp_deliver().] */ |
| 2587 | |
| 2588 | #ifdef SUPPORT_TLS |
| 2589 | if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE && |
| 2590 | ob->tls_tempfail_tryclear && |
| 2591 | verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, |
| 2592 | host->address, NULL) != OK) |
| 2593 | { |
| 2594 | log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted " |
| 2595 | "to %s [%s] (not in hosts_require_tls)", host->name, host->address); |
| 2596 | first_addr = prepare_addresses(addrlist, host); |
| 2597 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, |
| 2598 | expanded_hosts != NULL, &message_defer, TRUE); |
| 2599 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) |
| 2600 | write_logs(first_addr, host); |
| 2601 | } |
| 2602 | #endif |
| 2603 | } |
| 2604 | |
| 2605 | /* Delivery attempt finished */ |
| 2606 | |
| 2607 | rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)? |
| 2608 | US"ERROR" : US"?"; |
| 2609 | |
| 2610 | set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s", |
| 2611 | message_id, host->name, host->address, addrlist->address, |
| 2612 | (addrlist->next == NULL)? "" : " (& others)", rs); |
| 2613 | |
| 2614 | /* Release serialization if set up */ |
| 2615 | |
| 2616 | if (serialized) enq_end(serialize_key); |
| 2617 | |
| 2618 | /* If the result is DEFER, or if a host retry record is known to exist, we |
| 2619 | need to add an item to the retry chain for updating the retry database |
| 2620 | at the end of delivery. We only need to add the item to the top address, |
| 2621 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it |
| 2622 | for any other delivery attempts using the same address. (It is copied into |
| 2623 | the unusable tree at the outer level, so even if different address blocks |
| 2624 | contain the same address, it still won't get tried again.) */ |
| 2625 | |
| 2626 | if (rc == DEFER || retry_host_key != NULL) |
| 2627 | { |
| 2628 | int delete_flag = (rc != DEFER)? rf_delete : 0; |
| 2629 | if (retry_host_key == NULL) |
| 2630 | { |
| 2631 | retry_host_key = ob->retry_include_ip_address? |
| 2632 | string_sprintf("T:%S:%s%s", host->name, host->address, pistring) : |
| 2633 | string_sprintf("T:%S%s", host->name, pistring); |
| 2634 | } |
| 2635 | |
| 2636 | /* If a delivery of another message over an existing SMTP connection |
| 2637 | yields DEFER, we do NOT set up retry data for the host. This covers the |
| 2638 | case when there are delays in routing the addresses in the second message |
| 2639 | that are so long that the server times out. This is alleviated by not |
| 2640 | routing addresses that previously had routing defers when handling an |
| 2641 | existing connection, but even so, this case may occur (e.g. if a |
| 2642 | previously happily routed address starts giving routing defers). If the |
| 2643 | host is genuinely down, another non-continued message delivery will |
| 2644 | notice it soon enough. */ |
| 2645 | |
| 2646 | if (delete_flag != 0 || !continuing) |
| 2647 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); |
| 2648 | |
| 2649 | /* We may have tried an expired host, if its retry time has come; ensure |
| 2650 | the status reflects the expiry for the benefit of any other addresses. */ |
| 2651 | |
| 2652 | if (rc == DEFER) |
| 2653 | { |
| 2654 | host->status = (host_is_expired)? |
| 2655 | hstatus_unusable_expired : hstatus_unusable; |
| 2656 | host->why = hwhy_deferred; |
| 2657 | } |
| 2658 | } |
| 2659 | |
| 2660 | /* If message_defer is set (host was OK, but every recipient got deferred |
| 2661 | because of some message-specific problem), or if that had happened |
| 2662 | previously so that a message retry key exists, add an appropriate item |
| 2663 | to the retry chain. Note that if there was a message defer but now there is |
| 2664 | a host defer, the message defer record gets deleted. That seems perfectly |
| 2665 | reasonable. Also, stop the message from being remembered as waiting |
| 2666 | for this host. */ |
| 2667 | |
| 2668 | if (message_defer || retry_message_key != NULL) |
| 2669 | { |
| 2670 | int delete_flag = message_defer? 0 : rf_delete; |
| 2671 | if (retry_message_key == NULL) |
| 2672 | { |
| 2673 | retry_message_key = ob->retry_include_ip_address? |
| 2674 | string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, |
| 2675 | message_id) : |
| 2676 | string_sprintf("T:%S%s:%s", host->name, pistring, message_id); |
| 2677 | } |
| 2678 | retry_add_item(addrlist, retry_message_key, |
| 2679 | rf_message | rf_host | delete_flag); |
| 2680 | host->update_waiting = FALSE; |
| 2681 | } |
| 2682 | |
| 2683 | /* Any return other than DEFER (that is, OK or ERROR) means that the |
| 2684 | addresses have got their final statuses filled in for this host. In the OK |
| 2685 | case, see if any of them are deferred. */ |
| 2686 | |
| 2687 | if (rc == OK) |
| 2688 | { |
| 2689 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2690 | { |
| 2691 | if (addr->transport_return == DEFER) |
| 2692 | { |
| 2693 | some_deferred = TRUE; |
| 2694 | break; |
| 2695 | } |
| 2696 | } |
| 2697 | } |
| 2698 | |
| 2699 | /* If no addresses deferred or the result was ERROR, return. We do this for |
| 2700 | ERROR because a failing filter set-up or add_headers expansion is likely to |
| 2701 | fail for any host we try. */ |
| 2702 | |
| 2703 | if (rc == ERROR || (rc == OK && !some_deferred)) |
| 2704 | { |
| 2705 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); |
| 2706 | return TRUE; /* Each address has its status */ |
| 2707 | } |
| 2708 | |
| 2709 | /* If the result was DEFER or some individual addresses deferred, let |
| 2710 | the loop run to try other hosts with the deferred addresses, except for the |
| 2711 | case when we were trying to deliver down an existing channel and failed. |
| 2712 | Don't try any other hosts in this case. */ |
| 2713 | |
| 2714 | if (continuing) break; |
| 2715 | |
| 2716 | /* If the whole delivery, or some individual addresses, were deferred and |
| 2717 | there are more hosts that could be tried, do not count this host towards |
| 2718 | the hosts_max_try limit if the age of the message is greater than the |
| 2719 | maximum retry time for this host. This means we may try try all hosts, |
| 2720 | ignoring the limit, when messages have been around for some time. This is |
| 2721 | important because if we don't try all hosts, the address will never time |
| 2722 | out. NOTE: this does not apply to hosts_max_try_hardlimit. */ |
| 2723 | |
| 2724 | if ((rc == DEFER || some_deferred) && nexthost != NULL) |
| 2725 | { |
| 2726 | BOOL timedout; |
| 2727 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); |
| 2728 | |
| 2729 | if (retry != NULL && retry->rules != NULL) |
| 2730 | { |
| 2731 | retry_rule *last_rule; |
| 2732 | for (last_rule = retry->rules; |
| 2733 | last_rule->next != NULL; |
| 2734 | last_rule = last_rule->next); |
| 2735 | timedout = time(NULL) - received_time > last_rule->timeout; |
| 2736 | } |
| 2737 | else timedout = TRUE; /* No rule => timed out */ |
| 2738 | |
| 2739 | if (timedout) |
| 2740 | { |
| 2741 | unexpired_hosts_tried--; |
| 2742 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " |
| 2743 | "hosts_max_try (message older than host's retry time)\n"); |
| 2744 | } |
| 2745 | } |
| 2746 | } /* End of loop for trying multiple hosts. */ |
| 2747 | |
| 2748 | /* This is the end of the loop that repeats iff expired is TRUE and |
| 2749 | ob->delay_after_cutoff is FALSE. The second time round we will |
| 2750 | try those hosts that haven't been tried since the message arrived. */ |
| 2751 | |
| 2752 | DEBUG(D_transport) |
| 2753 | { |
| 2754 | debug_printf("all IP addresses skipped or deferred at least one address\n"); |
| 2755 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) |
| 2756 | debug_printf("retrying IP addresses not tried since message arrived\n"); |
| 2757 | } |
| 2758 | } |
| 2759 | |
| 2760 | |
| 2761 | /* Get here if all IP addresses are skipped or defer at least one address. In |
| 2762 | MUA wrapper mode, this will happen only for connection or other non-message- |
| 2763 | specific failures. Force the delivery status for all addresses to FAIL. */ |
| 2764 | |
| 2765 | if (mua_wrapper) |
| 2766 | { |
| 2767 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2768 | addr->transport_return = FAIL; |
| 2769 | goto END_TRANSPORT; |
| 2770 | } |
| 2771 | |
| 2772 | /* In the normal, non-wrapper case, add a standard message to each deferred |
| 2773 | address if there hasn't been an error, that is, if it hasn't actually been |
| 2774 | tried this time. The variable "expired" will be FALSE if any deliveries were |
| 2775 | actually tried, or if there was at least one host that was not expired. That |
| 2776 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If |
| 2777 | a delivery has been tried, an error code will be set, and the failing of the |
| 2778 | message is handled by the retry code later. |
| 2779 | |
| 2780 | If queue_smtp is set, or this transport was called to send a subsequent message |
| 2781 | down an existing TCP/IP connection, and something caused the host not to be |
| 2782 | found, we end up here, but can detect these cases and handle them specially. */ |
| 2783 | |
| 2784 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 2785 | { |
| 2786 | /* If host is not NULL, it means that we stopped processing the host list |
| 2787 | because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this |
| 2788 | means we need to behave as if some hosts were skipped because their retry |
| 2789 | time had not come. Specifically, this prevents the address from timing out. |
| 2790 | However, if we have hit hosts_max_try_hardlimit, we want to behave as if all |
| 2791 | hosts were tried. */ |
| 2792 | |
| 2793 | if (host != NULL) |
| 2794 | { |
| 2795 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
| 2796 | { |
| 2797 | DEBUG(D_transport) |
| 2798 | debug_printf("hosts_max_try_hardlimit reached: behave as if all " |
| 2799 | "hosts were tried\n"); |
| 2800 | } |
| 2801 | else |
| 2802 | { |
| 2803 | DEBUG(D_transport) |
| 2804 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); |
| 2805 | setflag(addr, af_retry_skipped); |
| 2806 | } |
| 2807 | } |
| 2808 | |
| 2809 | if (queue_smtp) /* no deliveries attempted */ |
| 2810 | { |
| 2811 | addr->transport_return = DEFER; |
| 2812 | addr->basic_errno = 0; |
| 2813 | addr->message = US"SMTP delivery explicitly queued"; |
| 2814 | } |
| 2815 | |
| 2816 | else if (addr->transport_return == DEFER && |
| 2817 | (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) && |
| 2818 | addr->message == NULL) |
| 2819 | { |
| 2820 | addr->basic_errno = ERRNO_HRETRY; |
| 2821 | if (continue_hostname != NULL) |
| 2822 | { |
| 2823 | addr->message = US"no host found for existing SMTP connection"; |
| 2824 | } |
| 2825 | else if (expired) |
| 2826 | { |
| 2827 | setflag(addr, af_pass_message); /* This is not a security risk */ |
| 2828 | addr->message = (ob->delay_after_cutoff)? |
| 2829 | US"retry time not reached for any host after a long failure period" : |
| 2830 | US"all hosts have been failing for a long time and were last tried " |
| 2831 | "after this message arrived"; |
| 2832 | |
| 2833 | /* If we are already using fallback hosts, or there are no fallback hosts |
| 2834 | defined, convert the result to FAIL to cause a bounce. */ |
| 2835 | |
| 2836 | if (addr->host_list == addr->fallback_hosts || |
| 2837 | addr->fallback_hosts == NULL) |
| 2838 | addr->transport_return = FAIL; |
| 2839 | } |
| 2840 | else |
| 2841 | { |
| 2842 | if (hosts_retry == hosts_total) |
| 2843 | addr->message = US"retry time not reached for any host"; |
| 2844 | else if (hosts_fail == hosts_total) |
| 2845 | addr->message = US"all host address lookups failed permanently"; |
| 2846 | else if (hosts_defer == hosts_total) |
| 2847 | addr->message = US"all host address lookups failed temporarily"; |
| 2848 | else if (hosts_serial == hosts_total) |
| 2849 | addr->message = US"connection limit reached for all hosts"; |
| 2850 | else if (hosts_fail+hosts_defer == hosts_total) |
| 2851 | addr->message = US"all host address lookups failed"; |
| 2852 | else addr->message = US"some host address lookups failed and retry time " |
| 2853 | "not reached for other hosts or connection limit reached"; |
| 2854 | } |
| 2855 | } |
| 2856 | } |
| 2857 | |
| 2858 | /* Update the database which keeps information about which messages are waiting |
| 2859 | for which hosts to become available. Each host in the list has a flag which is |
| 2860 | set if the data is to be updated. For some message-specific errors, the flag is |
| 2861 | turned off because we don't want follow-on deliveries in those cases. */ |
| 2862 | |
| 2863 | transport_update_waiting(hostlist, tblock->name); |
| 2864 | |
| 2865 | END_TRANSPORT: |
| 2866 | |
| 2867 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); |
| 2868 | |
| 2869 | return TRUE; /* Each address has its status */ |
| 2870 | } |
| 2871 | |
| 2872 | /* End of transport/smtp.c */ |