| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) University of Cambridge 1995 - 2017 */ |
| 6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | |
| 8 | #include "../exim.h" |
| 9 | #include "smtp.h" |
| 10 | |
| 11 | |
| 12 | /* Options specific to the smtp transport. This transport also supports LMTP |
| 13 | over TCP/IP. The options must be in alphabetic order (note that "_" comes |
| 14 | before the lower case letters). Some live in the transport_instance block so as |
| 15 | to be publicly visible; these are flagged with opt_public. */ |
| 16 | |
| 17 | optionlist smtp_transport_options[] = { |
| 18 | { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public, |
| 19 | (void *)offsetof(transport_instance, expand_multi_domain) }, |
| 20 | { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden, |
| 21 | (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) }, |
| 22 | |
| 23 | { "address_retry_include_sender", opt_bool, |
| 24 | (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) }, |
| 25 | { "allow_localhost", opt_bool, |
| 26 | (void *)offsetof(smtp_transport_options_block, allow_localhost) }, |
| 27 | { "authenticated_sender", opt_stringptr, |
| 28 | (void *)offsetof(smtp_transport_options_block, authenticated_sender) }, |
| 29 | { "authenticated_sender_force", opt_bool, |
| 30 | (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) }, |
| 31 | { "command_timeout", opt_time, |
| 32 | (void *)offsetof(smtp_transport_options_block, command_timeout) }, |
| 33 | { "connect_timeout", opt_time, |
| 34 | (void *)offsetof(smtp_transport_options_block, connect_timeout) }, |
| 35 | { "connection_max_messages", opt_int | opt_public, |
| 36 | (void *)offsetof(transport_instance, connection_max_messages) }, |
| 37 | { "data_timeout", opt_time, |
| 38 | (void *)offsetof(smtp_transport_options_block, data_timeout) }, |
| 39 | { "delay_after_cutoff", opt_bool, |
| 40 | (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) }, |
| 41 | #ifndef DISABLE_DKIM |
| 42 | { "dkim_canon", opt_stringptr, |
| 43 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) }, |
| 44 | { "dkim_domain", opt_stringptr, |
| 45 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) }, |
| 46 | { "dkim_private_key", opt_stringptr, |
| 47 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) }, |
| 48 | { "dkim_selector", opt_stringptr, |
| 49 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) }, |
| 50 | { "dkim_sign_headers", opt_stringptr, |
| 51 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) }, |
| 52 | { "dkim_strict", opt_stringptr, |
| 53 | (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) }, |
| 54 | #endif |
| 55 | { "dns_qualify_single", opt_bool, |
| 56 | (void *)offsetof(smtp_transport_options_block, dns_qualify_single) }, |
| 57 | { "dns_search_parents", opt_bool, |
| 58 | (void *)offsetof(smtp_transport_options_block, dns_search_parents) }, |
| 59 | { "dnssec_request_domains", opt_stringptr, |
| 60 | (void *)offsetof(smtp_transport_options_block, dnssec.request) }, |
| 61 | { "dnssec_require_domains", opt_stringptr, |
| 62 | (void *)offsetof(smtp_transport_options_block, dnssec.require) }, |
| 63 | { "dscp", opt_stringptr, |
| 64 | (void *)offsetof(smtp_transport_options_block, dscp) }, |
| 65 | { "fallback_hosts", opt_stringptr, |
| 66 | (void *)offsetof(smtp_transport_options_block, fallback_hosts) }, |
| 67 | { "final_timeout", opt_time, |
| 68 | (void *)offsetof(smtp_transport_options_block, final_timeout) }, |
| 69 | { "gethostbyname", opt_bool, |
| 70 | (void *)offsetof(smtp_transport_options_block, gethostbyname) }, |
| 71 | { "helo_data", opt_stringptr, |
| 72 | (void *)offsetof(smtp_transport_options_block, helo_data) }, |
| 73 | { "hosts", opt_stringptr, |
| 74 | (void *)offsetof(smtp_transport_options_block, hosts) }, |
| 75 | { "hosts_avoid_esmtp", opt_stringptr, |
| 76 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) }, |
| 77 | { "hosts_avoid_pipelining", opt_stringptr, |
| 78 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) }, |
| 79 | #ifdef SUPPORT_TLS |
| 80 | { "hosts_avoid_tls", opt_stringptr, |
| 81 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) }, |
| 82 | #endif |
| 83 | { "hosts_max_try", opt_int, |
| 84 | (void *)offsetof(smtp_transport_options_block, hosts_max_try) }, |
| 85 | { "hosts_max_try_hardlimit", opt_int, |
| 86 | (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) }, |
| 87 | #ifdef SUPPORT_TLS |
| 88 | { "hosts_nopass_tls", opt_stringptr, |
| 89 | (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) }, |
| 90 | #endif |
| 91 | { "hosts_override", opt_bool, |
| 92 | (void *)offsetof(smtp_transport_options_block, hosts_override) }, |
| 93 | { "hosts_randomize", opt_bool, |
| 94 | (void *)offsetof(smtp_transport_options_block, hosts_randomize) }, |
| 95 | #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP) |
| 96 | { "hosts_request_ocsp", opt_stringptr, |
| 97 | (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) }, |
| 98 | #endif |
| 99 | { "hosts_require_auth", opt_stringptr, |
| 100 | (void *)offsetof(smtp_transport_options_block, hosts_require_auth) }, |
| 101 | #ifdef SUPPORT_TLS |
| 102 | # ifdef EXPERIMENTAL_DANE |
| 103 | { "hosts_require_dane", opt_stringptr, |
| 104 | (void *)offsetof(smtp_transport_options_block, hosts_require_dane) }, |
| 105 | # endif |
| 106 | # ifndef DISABLE_OCSP |
| 107 | { "hosts_require_ocsp", opt_stringptr, |
| 108 | (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) }, |
| 109 | # endif |
| 110 | { "hosts_require_tls", opt_stringptr, |
| 111 | (void *)offsetof(smtp_transport_options_block, hosts_require_tls) }, |
| 112 | #endif |
| 113 | { "hosts_try_auth", opt_stringptr, |
| 114 | (void *)offsetof(smtp_transport_options_block, hosts_try_auth) }, |
| 115 | { "hosts_try_chunking", opt_stringptr, |
| 116 | (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) }, |
| 117 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
| 118 | { "hosts_try_dane", opt_stringptr, |
| 119 | (void *)offsetof(smtp_transport_options_block, hosts_try_dane) }, |
| 120 | #endif |
| 121 | { "hosts_try_fastopen", opt_stringptr, |
| 122 | (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) }, |
| 123 | #ifndef DISABLE_PRDR |
| 124 | { "hosts_try_prdr", opt_stringptr, |
| 125 | (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) }, |
| 126 | #endif |
| 127 | #ifdef SUPPORT_TLS |
| 128 | { "hosts_verify_avoid_tls", opt_stringptr, |
| 129 | (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) }, |
| 130 | #endif |
| 131 | { "interface", opt_stringptr, |
| 132 | (void *)offsetof(smtp_transport_options_block, interface) }, |
| 133 | { "keepalive", opt_bool, |
| 134 | (void *)offsetof(smtp_transport_options_block, keepalive) }, |
| 135 | { "lmtp_ignore_quota", opt_bool, |
| 136 | (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) }, |
| 137 | { "max_rcpt", opt_int | opt_public, |
| 138 | (void *)offsetof(transport_instance, max_addresses) }, |
| 139 | { "multi_domain", opt_expand_bool | opt_public, |
| 140 | (void *)offsetof(transport_instance, multi_domain) }, |
| 141 | { "port", opt_stringptr, |
| 142 | (void *)offsetof(smtp_transport_options_block, port) }, |
| 143 | { "protocol", opt_stringptr, |
| 144 | (void *)offsetof(smtp_transport_options_block, protocol) }, |
| 145 | { "retry_include_ip_address", opt_expand_bool, |
| 146 | (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) }, |
| 147 | { "serialize_hosts", opt_stringptr, |
| 148 | (void *)offsetof(smtp_transport_options_block, serialize_hosts) }, |
| 149 | { "size_addition", opt_int, |
| 150 | (void *)offsetof(smtp_transport_options_block, size_addition) } |
| 151 | #ifdef SUPPORT_SOCKS |
| 152 | ,{ "socks_proxy", opt_stringptr, |
| 153 | (void *)offsetof(smtp_transport_options_block, socks_proxy) } |
| 154 | #endif |
| 155 | #ifdef SUPPORT_TLS |
| 156 | ,{ "tls_certificate", opt_stringptr, |
| 157 | (void *)offsetof(smtp_transport_options_block, tls_certificate) }, |
| 158 | { "tls_crl", opt_stringptr, |
| 159 | (void *)offsetof(smtp_transport_options_block, tls_crl) }, |
| 160 | { "tls_dh_min_bits", opt_int, |
| 161 | (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) }, |
| 162 | { "tls_privatekey", opt_stringptr, |
| 163 | (void *)offsetof(smtp_transport_options_block, tls_privatekey) }, |
| 164 | { "tls_require_ciphers", opt_stringptr, |
| 165 | (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) }, |
| 166 | { "tls_sni", opt_stringptr, |
| 167 | (void *)offsetof(smtp_transport_options_block, tls_sni) }, |
| 168 | { "tls_tempfail_tryclear", opt_bool, |
| 169 | (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) }, |
| 170 | { "tls_try_verify_hosts", opt_stringptr, |
| 171 | (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) }, |
| 172 | { "tls_verify_cert_hostnames", opt_stringptr, |
| 173 | (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)}, |
| 174 | { "tls_verify_certificates", opt_stringptr, |
| 175 | (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }, |
| 176 | { "tls_verify_hosts", opt_stringptr, |
| 177 | (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) } |
| 178 | #endif |
| 179 | }; |
| 180 | |
| 181 | /* Size of the options list. An extern variable has to be used so that its |
| 182 | address can appear in the tables drtables.c. */ |
| 183 | |
| 184 | int smtp_transport_options_count = |
| 185 | sizeof(smtp_transport_options)/sizeof(optionlist); |
| 186 | |
| 187 | /* Default private options block for the smtp transport. */ |
| 188 | |
| 189 | smtp_transport_options_block smtp_transport_option_defaults = { |
| 190 | NULL, /* hosts */ |
| 191 | NULL, /* fallback_hosts */ |
| 192 | NULL, /* hostlist */ |
| 193 | NULL, /* fallback_hostlist */ |
| 194 | NULL, /* authenticated_sender */ |
| 195 | US"$primary_hostname", /* helo_data */ |
| 196 | NULL, /* interface */ |
| 197 | NULL, /* port */ |
| 198 | US"smtp", /* protocol */ |
| 199 | NULL, /* DSCP */ |
| 200 | NULL, /* serialize_hosts */ |
| 201 | NULL, /* hosts_try_auth */ |
| 202 | NULL, /* hosts_require_auth */ |
| 203 | US"*", /* hosts_try_chunking */ |
| 204 | #ifdef EXPERIMENTAL_DANE |
| 205 | NULL, /* hosts_try_dane */ |
| 206 | NULL, /* hosts_require_dane */ |
| 207 | #endif |
| 208 | NULL, /* hosts_try_fastopen */ |
| 209 | #ifndef DISABLE_PRDR |
| 210 | US"*", /* hosts_try_prdr */ |
| 211 | #endif |
| 212 | #ifndef DISABLE_OCSP |
| 213 | US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */ |
| 214 | NULL, /* hosts_require_ocsp */ |
| 215 | #endif |
| 216 | NULL, /* hosts_require_tls */ |
| 217 | NULL, /* hosts_avoid_tls */ |
| 218 | NULL, /* hosts_verify_avoid_tls */ |
| 219 | NULL, /* hosts_avoid_pipelining */ |
| 220 | NULL, /* hosts_avoid_esmtp */ |
| 221 | NULL, /* hosts_nopass_tls */ |
| 222 | 5*60, /* command_timeout */ |
| 223 | 5*60, /* connect_timeout; shorter system default overrides */ |
| 224 | 5*60, /* data timeout */ |
| 225 | 10*60, /* final timeout */ |
| 226 | 1024, /* size_addition */ |
| 227 | 5, /* hosts_max_try */ |
| 228 | 50, /* hosts_max_try_hardlimit */ |
| 229 | TRUE, /* address_retry_include_sender */ |
| 230 | FALSE, /* allow_localhost */ |
| 231 | FALSE, /* authenticated_sender_force */ |
| 232 | FALSE, /* gethostbyname */ |
| 233 | TRUE, /* dns_qualify_single */ |
| 234 | FALSE, /* dns_search_parents */ |
| 235 | { NULL, NULL }, /* dnssec_domains {request,require} */ |
| 236 | TRUE, /* delay_after_cutoff */ |
| 237 | FALSE, /* hosts_override */ |
| 238 | FALSE, /* hosts_randomize */ |
| 239 | TRUE, /* keepalive */ |
| 240 | FALSE, /* lmtp_ignore_quota */ |
| 241 | NULL, /* expand_retry_include_ip_address */ |
| 242 | TRUE /* retry_include_ip_address */ |
| 243 | #ifdef SUPPORT_SOCKS |
| 244 | ,NULL /* socks_proxy */ |
| 245 | #endif |
| 246 | #ifdef SUPPORT_TLS |
| 247 | ,NULL, /* tls_certificate */ |
| 248 | NULL, /* tls_crl */ |
| 249 | NULL, /* tls_privatekey */ |
| 250 | NULL, /* tls_require_ciphers */ |
| 251 | NULL, /* tls_sni */ |
| 252 | US"system", /* tls_verify_certificates */ |
| 253 | EXIM_CLIENT_DH_DEFAULT_MIN_BITS, |
| 254 | /* tls_dh_min_bits */ |
| 255 | TRUE, /* tls_tempfail_tryclear */ |
| 256 | NULL, /* tls_verify_hosts */ |
| 257 | US"*", /* tls_try_verify_hosts */ |
| 258 | US"*" /* tls_verify_cert_hostnames */ |
| 259 | #endif |
| 260 | #ifndef DISABLE_DKIM |
| 261 | , {NULL, /* dkim_canon */ |
| 262 | NULL, /* dkim_domain */ |
| 263 | NULL, /* dkim_private_key */ |
| 264 | NULL, /* dkim_selector */ |
| 265 | NULL, /* dkim_sign_headers */ |
| 266 | NULL, /* dkim_strict */ |
| 267 | FALSE} /* dot_stuffed */ |
| 268 | #endif |
| 269 | }; |
| 270 | |
| 271 | /* some DSN flags for use later */ |
| 272 | |
| 273 | static int rf_list[] = {rf_notify_never, rf_notify_success, |
| 274 | rf_notify_failure, rf_notify_delay }; |
| 275 | |
| 276 | static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" }; |
| 277 | |
| 278 | |
| 279 | |
| 280 | /* Local statics */ |
| 281 | |
| 282 | static uschar *smtp_command; /* Points to last cmd for error messages */ |
| 283 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ |
| 284 | static uschar *data_command = US""; /* Points to DATA cmd for error messages */ |
| 285 | static BOOL update_waiting; /* TRUE to update the "wait" database */ |
| 286 | static BOOL pipelining_active; /* current transaction is in pipe mode */ |
| 287 | |
| 288 | |
| 289 | /************************************************* |
| 290 | * Setup entry point * |
| 291 | *************************************************/ |
| 292 | |
| 293 | /* This function is called when the transport is about to be used, |
| 294 | but before running it in a sub-process. It is used for two things: |
| 295 | |
| 296 | (1) To set the fallback host list in addresses, when delivering. |
| 297 | (2) To pass back the interface, port, protocol, and other options, for use |
| 298 | during callout verification. |
| 299 | |
| 300 | Arguments: |
| 301 | tblock pointer to the transport instance block |
| 302 | addrlist list of addresses about to be transported |
| 303 | tf if not NULL, pointer to block in which to return options |
| 304 | uid the uid that will be set (not used) |
| 305 | gid the gid that will be set (not used) |
| 306 | errmsg place for error message (not used) |
| 307 | |
| 308 | Returns: OK always (FAIL, DEFER not used) |
| 309 | */ |
| 310 | |
| 311 | static int |
| 312 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, |
| 313 | transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg) |
| 314 | { |
| 315 | smtp_transport_options_block *ob = |
| 316 | (smtp_transport_options_block *)(tblock->options_block); |
| 317 | |
| 318 | errmsg = errmsg; /* Keep picky compilers happy */ |
| 319 | uid = uid; |
| 320 | gid = gid; |
| 321 | |
| 322 | /* Pass back options if required. This interface is getting very messy. */ |
| 323 | |
| 324 | if (tf) |
| 325 | { |
| 326 | tf->interface = ob->interface; |
| 327 | tf->port = ob->port; |
| 328 | tf->protocol = ob->protocol; |
| 329 | tf->hosts = ob->hosts; |
| 330 | tf->hosts_override = ob->hosts_override; |
| 331 | tf->hosts_randomize = ob->hosts_randomize; |
| 332 | tf->gethostbyname = ob->gethostbyname; |
| 333 | tf->qualify_single = ob->dns_qualify_single; |
| 334 | tf->search_parents = ob->dns_search_parents; |
| 335 | tf->helo_data = ob->helo_data; |
| 336 | } |
| 337 | |
| 338 | /* Set the fallback host list for all the addresses that don't have fallback |
| 339 | host lists, provided that the local host wasn't present in the original host |
| 340 | list. */ |
| 341 | |
| 342 | if (!testflag(addrlist, af_local_host_removed)) |
| 343 | for (; addrlist; addrlist = addrlist->next) |
| 344 | if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist; |
| 345 | |
| 346 | return OK; |
| 347 | } |
| 348 | |
| 349 | |
| 350 | |
| 351 | /************************************************* |
| 352 | * Initialization entry point * |
| 353 | *************************************************/ |
| 354 | |
| 355 | /* Called for each instance, after its options have been read, to |
| 356 | enable consistency checks to be done, or anything else that needs |
| 357 | to be set up. |
| 358 | |
| 359 | Argument: pointer to the transport instance block |
| 360 | Returns: nothing |
| 361 | */ |
| 362 | |
| 363 | void |
| 364 | smtp_transport_init(transport_instance *tblock) |
| 365 | { |
| 366 | smtp_transport_options_block *ob = |
| 367 | (smtp_transport_options_block *)(tblock->options_block); |
| 368 | |
| 369 | /* Retry_use_local_part defaults FALSE if unset */ |
| 370 | |
| 371 | if (tblock->retry_use_local_part == TRUE_UNSET) |
| 372 | tblock->retry_use_local_part = FALSE; |
| 373 | |
| 374 | /* Set the default port according to the protocol */ |
| 375 | |
| 376 | if (ob->port == NULL) |
| 377 | ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : |
| 378 | (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp"; |
| 379 | |
| 380 | /* Set up the setup entry point, to be called before subprocesses for this |
| 381 | transport. */ |
| 382 | |
| 383 | tblock->setup = smtp_transport_setup; |
| 384 | |
| 385 | /* Complain if any of the timeouts are zero. */ |
| 386 | |
| 387 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || |
| 388 | ob->final_timeout <= 0) |
| 389 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, |
| 390 | "command, data, or final timeout value is zero for %s transport", |
| 391 | tblock->name); |
| 392 | |
| 393 | /* If hosts_override is set and there are local hosts, set the global |
| 394 | flag that stops verify from showing router hosts. */ |
| 395 | |
| 396 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; |
| 397 | |
| 398 | /* If there are any fallback hosts listed, build a chain of host items |
| 399 | for them, but do not do any lookups at this time. */ |
| 400 | |
| 401 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); |
| 402 | } |
| 403 | |
| 404 | |
| 405 | |
| 406 | |
| 407 | |
| 408 | /************************************************* |
| 409 | * Set delivery info into all active addresses * |
| 410 | *************************************************/ |
| 411 | |
| 412 | /* Only addresses whose status is >= PENDING are relevant. A lesser |
| 413 | status means that an address is not currently being processed. |
| 414 | |
| 415 | Arguments: |
| 416 | addrlist points to a chain of addresses |
| 417 | errno_value to put in each address's errno field |
| 418 | msg to put in each address's message field |
| 419 | rc to put in each address's transport_return field |
| 420 | pass_message if TRUE, set the "pass message" flag in the address |
| 421 | host if set, mark addrs as having used this host |
| 422 | smtp_greeting from peer |
| 423 | helo_response from peer |
| 424 | |
| 425 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in |
| 426 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate |
| 427 | this particular type of timeout. |
| 428 | |
| 429 | Returns: nothing |
| 430 | */ |
| 431 | |
| 432 | static void |
| 433 | set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc, |
| 434 | BOOL pass_message, host_item * host |
| 435 | #ifdef EXPERIMENTAL_DSN_INFO |
| 436 | , const uschar * smtp_greeting, const uschar * helo_response |
| 437 | #endif |
| 438 | ) |
| 439 | { |
| 440 | address_item *addr; |
| 441 | int orvalue = 0; |
| 442 | if (errno_value == ERRNO_CONNECTTIMEOUT) |
| 443 | { |
| 444 | errno_value = ETIMEDOUT; |
| 445 | orvalue = RTEF_CTOUT; |
| 446 | } |
| 447 | for (addr = addrlist; addr; addr = addr->next) |
| 448 | if (addr->transport_return >= PENDING) |
| 449 | { |
| 450 | addr->basic_errno = errno_value; |
| 451 | addr->more_errno |= orvalue; |
| 452 | if (msg) |
| 453 | { |
| 454 | addr->message = msg; |
| 455 | if (pass_message) setflag(addr, af_pass_message); |
| 456 | } |
| 457 | addr->transport_return = rc; |
| 458 | if (host) |
| 459 | { |
| 460 | addr->host_used = host; |
| 461 | #ifdef EXPERIMENTAL_DSN_INFO |
| 462 | if (smtp_greeting) |
| 463 | {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';} |
| 464 | addr->smtp_greeting = smtp_greeting; |
| 465 | |
| 466 | if (helo_response) |
| 467 | {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';} |
| 468 | addr->helo_response = helo_response; |
| 469 | #endif |
| 470 | } |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | static void |
| 475 | set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc, |
| 476 | BOOL pass_message) |
| 477 | { |
| 478 | set_errno(addrlist, errno_value, msg, rc, pass_message, NULL |
| 479 | #ifdef EXPERIMENTAL_DSN_INFO |
| 480 | , NULL, NULL |
| 481 | #endif |
| 482 | ); |
| 483 | } |
| 484 | |
| 485 | |
| 486 | /************************************************* |
| 487 | * Check an SMTP response * |
| 488 | *************************************************/ |
| 489 | |
| 490 | /* This function is given an errno code and the SMTP response buffer |
| 491 | to analyse, together with the host identification for generating messages. It |
| 492 | sets an appropriate message and puts the first digit of the response code into |
| 493 | the yield variable. If no response was actually read, a suitable digit is |
| 494 | chosen. |
| 495 | |
| 496 | Arguments: |
| 497 | host the current host, to get its name for messages |
| 498 | errno_value pointer to the errno value |
| 499 | more_errno from the top address for use with ERRNO_FILTER_FAIL |
| 500 | buffer the SMTP response buffer |
| 501 | yield where to put a one-digit SMTP response code |
| 502 | message where to put an error message |
| 503 | pass_message set TRUE if message is an SMTP response |
| 504 | |
| 505 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE |
| 506 | */ |
| 507 | |
| 508 | static BOOL |
| 509 | check_response(host_item *host, int *errno_value, int more_errno, |
| 510 | uschar *buffer, int *yield, uschar **message, BOOL *pass_message) |
| 511 | { |
| 512 | uschar * pl = pipelining_active ? US"pipelined " : US""; |
| 513 | const uschar * s; |
| 514 | |
| 515 | *yield = '4'; /* Default setting is to give a temporary error */ |
| 516 | |
| 517 | switch(*errno_value) |
| 518 | { |
| 519 | case ETIMEDOUT: /* Handle response timeout */ |
| 520 | *message = US string_sprintf("SMTP timeout after %s%s", |
| 521 | pl, smtp_command); |
| 522 | if (transport_count > 0) |
| 523 | *message = US string_sprintf("%s (%d bytes written)", *message, |
| 524 | transport_count); |
| 525 | return FALSE; |
| 526 | |
| 527 | case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */ |
| 528 | s = string_printing(buffer); |
| 529 | while (isspace(*s)) s++; |
| 530 | *message = *s == 0 |
| 531 | ? string_sprintf("Malformed SMTP reply (an empty line) " |
| 532 | "in response to %s%s", pl, smtp_command) |
| 533 | : string_sprintf("Malformed SMTP reply in response to %s%s: %s", |
| 534 | pl, smtp_command, s); |
| 535 | return FALSE; |
| 536 | |
| 537 | case ERRNO_FILTER_FAIL: /* Handle a failed filter process error; |
| 538 | can't send QUIT as we mustn't end the DATA. */ |
| 539 | *message = string_sprintf("transport filter process failed (%d)%s", |
| 540 | more_errno, |
| 541 | more_errno == EX_EXECFAILED ? ": unable to execute command" : ""); |
| 542 | return FALSE; |
| 543 | |
| 544 | case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion; |
| 545 | can't send QUIT as we mustn't end the DATA. */ |
| 546 | *message = |
| 547 | string_sprintf("failed to expand headers_add or headers_remove: %s", |
| 548 | expand_string_message); |
| 549 | return FALSE; |
| 550 | |
| 551 | case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */ |
| 552 | *message = string_sprintf("failed to write a data block"); |
| 553 | return FALSE; |
| 554 | |
| 555 | #ifdef SUPPORT_I18N |
| 556 | case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */ |
| 557 | *message = US"utf8 support required but not offered for forwarding"; |
| 558 | DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message); |
| 559 | return TRUE; |
| 560 | #endif |
| 561 | } |
| 562 | |
| 563 | /* Handle error responses from the remote mailer. */ |
| 564 | |
| 565 | if (buffer[0] != 0) |
| 566 | { |
| 567 | *message = string_sprintf("SMTP error from remote mail server after %s%s: " |
| 568 | "%s", pl, smtp_command, s = string_printing(buffer)); |
| 569 | *pass_message = TRUE; |
| 570 | *yield = buffer[0]; |
| 571 | return TRUE; |
| 572 | } |
| 573 | |
| 574 | /* No data was read. If there is no errno, this must be the EOF (i.e. |
| 575 | connection closed) case, which causes deferral. An explicit connection reset |
| 576 | error has the same effect. Otherwise, put the host's identity in the message, |
| 577 | leaving the errno value to be interpreted as well. In all cases, we have to |
| 578 | assume the connection is now dead. */ |
| 579 | |
| 580 | if (*errno_value == 0 || *errno_value == ECONNRESET) |
| 581 | { |
| 582 | *errno_value = ERRNO_SMTPCLOSED; |
| 583 | *message = US string_sprintf("Remote host closed connection " |
| 584 | "in response to %s%s", pl, smtp_command); |
| 585 | } |
| 586 | else |
| 587 | *message = US string_sprintf("%s [%s]", host->name, host->address); |
| 588 | |
| 589 | return FALSE; |
| 590 | } |
| 591 | |
| 592 | |
| 593 | |
| 594 | /************************************************* |
| 595 | * Write error message to logs * |
| 596 | *************************************************/ |
| 597 | |
| 598 | /* This writes to the main log and to the message log. |
| 599 | |
| 600 | Arguments: |
| 601 | addr the address item containing error information |
| 602 | host the current host |
| 603 | |
| 604 | Returns: nothing |
| 605 | */ |
| 606 | |
| 607 | static void |
| 608 | write_logs(address_item *addr, host_item *host) |
| 609 | { |
| 610 | uschar * message = LOGGING(outgoing_port) |
| 611 | ? string_sprintf("H=%s [%s]:%d", host->name, host->address, |
| 612 | host->port == PORT_NONE ? 25 : host->port) |
| 613 | : string_sprintf("H=%s [%s]", host->name, host->address); |
| 614 | |
| 615 | if (addr->message) |
| 616 | { |
| 617 | message = string_sprintf("%s: %s", message, addr->message); |
| 618 | if (addr->basic_errno > 0) |
| 619 | message = string_sprintf("%s: %s", message, strerror(addr->basic_errno)); |
| 620 | log_write(0, LOG_MAIN, "%s", message); |
| 621 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); |
| 622 | } |
| 623 | else |
| 624 | { |
| 625 | const uschar * s = exim_errstr(addr->basic_errno); |
| 626 | log_write(0, LOG_MAIN, "%s %s", message, s); |
| 627 | deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s); |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | static void |
| 632 | msglog_line(host_item * host, uschar * message) |
| 633 | { |
| 634 | deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log), |
| 635 | host->name, host->address, message); |
| 636 | } |
| 637 | |
| 638 | |
| 639 | |
| 640 | #ifndef DISABLE_EVENT |
| 641 | /************************************************* |
| 642 | * Post-defer action * |
| 643 | *************************************************/ |
| 644 | |
| 645 | /* This expands an arbitrary per-transport string. |
| 646 | It might, for example, be used to write to the database log. |
| 647 | |
| 648 | Arguments: |
| 649 | addr the address item containing error information |
| 650 | host the current host |
| 651 | |
| 652 | Returns: nothing |
| 653 | */ |
| 654 | |
| 655 | static void |
| 656 | deferred_event_raise(address_item *addr, host_item *host) |
| 657 | { |
| 658 | uschar * action = addr->transport->event_action; |
| 659 | const uschar * save_domain; |
| 660 | uschar * save_local; |
| 661 | |
| 662 | if (!action) |
| 663 | return; |
| 664 | |
| 665 | save_domain = deliver_domain; |
| 666 | save_local = deliver_localpart; |
| 667 | |
| 668 | /*XXX would ip & port already be set up? */ |
| 669 | deliver_host_address = string_copy(host->address); |
| 670 | deliver_host_port = host->port == PORT_NONE ? 25 : host->port; |
| 671 | event_defer_errno = addr->basic_errno; |
| 672 | |
| 673 | router_name = addr->router->name; |
| 674 | transport_name = addr->transport->name; |
| 675 | deliver_domain = addr->domain; |
| 676 | deliver_localpart = addr->local_part; |
| 677 | |
| 678 | (void) event_raise(action, US"msg:host:defer", |
| 679 | addr->message |
| 680 | ? addr->basic_errno > 0 |
| 681 | ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno)) |
| 682 | : string_copy(addr->message) |
| 683 | : addr->basic_errno > 0 |
| 684 | ? string_copy(US strerror(addr->basic_errno)) |
| 685 | : NULL); |
| 686 | |
| 687 | deliver_localpart = save_local; |
| 688 | deliver_domain = save_domain; |
| 689 | router_name = transport_name = NULL; |
| 690 | } |
| 691 | #endif |
| 692 | |
| 693 | /************************************************* |
| 694 | * Synchronize SMTP responses * |
| 695 | *************************************************/ |
| 696 | |
| 697 | /* This function is called from smtp_deliver() to receive SMTP responses from |
| 698 | the server, and match them up with the commands to which they relate. When |
| 699 | PIPELINING is not in use, this function is called after every command, and is |
| 700 | therefore somewhat over-engineered, but it is simpler to use a single scheme |
| 701 | that works both with and without PIPELINING instead of having two separate sets |
| 702 | of code. |
| 703 | |
| 704 | The set of commands that are buffered up with pipelining may start with MAIL |
| 705 | and may end with DATA; in between are RCPT commands that correspond to the |
| 706 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, |
| 707 | etc.) are never buffered. |
| 708 | |
| 709 | Errors after MAIL or DATA abort the whole process leaving the response in the |
| 710 | buffer. After MAIL, pending responses are flushed, and the original command is |
| 711 | re-instated in big_buffer for error messages. For RCPT commands, the remote is |
| 712 | permitted to reject some recipient addresses while accepting others. However |
| 713 | certain errors clearly abort the whole process. Set the value in |
| 714 | transport_return to PENDING_OK if the address is accepted. If there is a |
| 715 | subsequent general error, it will get reset accordingly. If not, it will get |
| 716 | converted to OK at the end. |
| 717 | |
| 718 | Arguments: |
| 719 | sx smtp connection context |
| 720 | count the number of responses to read |
| 721 | pending_DATA 0 if last command sent was not DATA |
| 722 | +1 if previously had a good recipient |
| 723 | -1 if not previously had a good recipient |
| 724 | |
| 725 | Returns: 3 if at least one address had 2xx and one had 5xx |
| 726 | 2 if at least one address had 5xx but none had 2xx |
| 727 | 1 if at least one host had a 2xx response, but none had 5xx |
| 728 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) |
| 729 | -1 timeout while reading RCPT response |
| 730 | -2 I/O or other non-response error for RCPT |
| 731 | -3 DATA or MAIL failed - errno and buffer set |
| 732 | */ |
| 733 | |
| 734 | static int |
| 735 | sync_responses(smtp_context * sx, int count, int pending_DATA) |
| 736 | { |
| 737 | address_item *addr = sx->sync_addr; |
| 738 | smtp_transport_options_block *ob = |
| 739 | (smtp_transport_options_block *)sx->tblock->options_block; |
| 740 | int yield = 0; |
| 741 | |
| 742 | /* Handle the response for a MAIL command. On error, reinstate the original |
| 743 | command in big_buffer for error message use, and flush any further pending |
| 744 | responses before returning, except after I/O errors and timeouts. */ |
| 745 | |
| 746 | if (sx->pending_MAIL) |
| 747 | { |
| 748 | count--; |
| 749 | if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), |
| 750 | '2', ob->command_timeout)) |
| 751 | { |
| 752 | DEBUG(D_transport) debug_printf("bad response for MAIL\n"); |
| 753 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ |
| 754 | if (errno == 0 && sx->buffer[0] != 0) |
| 755 | { |
| 756 | uschar flushbuffer[4096]; |
| 757 | int save_errno = 0; |
| 758 | if (sx->buffer[0] == '4') |
| 759 | { |
| 760 | save_errno = ERRNO_MAIL4XX; |
| 761 | addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 762 | } |
| 763 | while (count-- > 0) |
| 764 | { |
| 765 | if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer), |
| 766 | '2', ob->command_timeout) |
| 767 | && (errno != 0 || flushbuffer[0] == 0)) |
| 768 | break; |
| 769 | } |
| 770 | errno = save_errno; |
| 771 | } |
| 772 | |
| 773 | if (pending_DATA) count--; /* Number of RCPT responses to come */ |
| 774 | while (count-- > 0) /* Mark any pending addrs with the host used */ |
| 775 | { |
| 776 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; |
| 777 | addr->host_used = sx->host; |
| 778 | addr = addr->next; |
| 779 | } |
| 780 | return -3; |
| 781 | } |
| 782 | } |
| 783 | |
| 784 | if (pending_DATA) count--; /* Number of RCPT responses to come */ |
| 785 | |
| 786 | /* Read and handle the required number of RCPT responses, matching each one up |
| 787 | with an address by scanning for the next address whose status is PENDING_DEFER. |
| 788 | */ |
| 789 | |
| 790 | while (count-- > 0) |
| 791 | { |
| 792 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; |
| 793 | |
| 794 | /* The address was accepted */ |
| 795 | addr->host_used = sx->host; |
| 796 | |
| 797 | if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), |
| 798 | '2', ob->command_timeout)) |
| 799 | { |
| 800 | yield |= 1; |
| 801 | addr->transport_return = PENDING_OK; |
| 802 | |
| 803 | /* If af_dr_retry_exists is set, there was a routing delay on this address; |
| 804 | ensure that any address-specific retry record is expunged. We do this both |
| 805 | for the basic key and for the version that also includes the sender. */ |
| 806 | |
| 807 | if (testflag(addr, af_dr_retry_exists)) |
| 808 | { |
| 809 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, |
| 810 | sender_address); |
| 811 | retry_add_item(addr, altkey, rf_delete); |
| 812 | retry_add_item(addr, addr->address_retry_key, rf_delete); |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | /* Timeout while reading the response */ |
| 817 | |
| 818 | else if (errno == ETIMEDOUT) |
| 819 | { |
| 820 | uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>", |
| 821 | transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes)); |
| 822 | set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE); |
| 823 | retry_add_item(addr, addr->address_retry_key, 0); |
| 824 | update_waiting = FALSE; |
| 825 | return -1; |
| 826 | } |
| 827 | |
| 828 | /* Handle other errors in obtaining an SMTP response by returning -1. This |
| 829 | will cause all the addresses to be deferred. Restore the SMTP command in |
| 830 | big_buffer for which we are checking the response, so the error message |
| 831 | makes sense. */ |
| 832 | |
| 833 | else if (errno != 0 || sx->buffer[0] == 0) |
| 834 | { |
| 835 | string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>", |
| 836 | transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes)); |
| 837 | return -2; |
| 838 | } |
| 839 | |
| 840 | /* Handle SMTP permanent and temporary response codes. */ |
| 841 | |
| 842 | else |
| 843 | { |
| 844 | addr->message = |
| 845 | string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: " |
| 846 | "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes), |
| 847 | string_printing(sx->buffer)); |
| 848 | setflag(addr, af_pass_message); |
| 849 | if (!sx->verify) |
| 850 | msglog_line(sx->host, addr->message); |
| 851 | |
| 852 | /* The response was 5xx */ |
| 853 | |
| 854 | if (sx->buffer[0] == '5') |
| 855 | { |
| 856 | addr->transport_return = FAIL; |
| 857 | yield |= 2; |
| 858 | } |
| 859 | |
| 860 | /* The response was 4xx */ |
| 861 | |
| 862 | else |
| 863 | { |
| 864 | addr->transport_return = DEFER; |
| 865 | addr->basic_errno = ERRNO_RCPT4XX; |
| 866 | addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 867 | |
| 868 | if (!sx->verify) |
| 869 | { |
| 870 | #ifndef DISABLE_EVENT |
| 871 | event_defer_errno = addr->more_errno; |
| 872 | msg_event_raise(US"msg:rcpt:host:defer", addr); |
| 873 | #endif |
| 874 | |
| 875 | /* Log temporary errors if there are more hosts to be tried. |
| 876 | If not, log this last one in the == line. */ |
| 877 | |
| 878 | if (sx->host->next) |
| 879 | log_write(0, LOG_MAIN, "H=%s [%s]: %s", |
| 880 | sx->host->name, sx->host->address, addr->message); |
| 881 | |
| 882 | #ifndef DISABLE_EVENT |
| 883 | else |
| 884 | msg_event_raise(US"msg:rcpt:defer", addr); |
| 885 | #endif |
| 886 | |
| 887 | /* Do not put this message on the list of those waiting for specific |
| 888 | hosts, as otherwise it is likely to be tried too often. */ |
| 889 | |
| 890 | update_waiting = FALSE; |
| 891 | |
| 892 | /* Add a retry item for the address so that it doesn't get tried again |
| 893 | too soon. If address_retry_include_sender is true, add the sender address |
| 894 | to the retry key. */ |
| 895 | |
| 896 | retry_add_item(addr, |
| 897 | ob->address_retry_include_sender |
| 898 | ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address) |
| 899 | : addr->address_retry_key, |
| 900 | 0); |
| 901 | } |
| 902 | } |
| 903 | } |
| 904 | } /* Loop for next RCPT response */ |
| 905 | |
| 906 | /* Update where to start at for the next block of responses, unless we |
| 907 | have already handled all the addresses. */ |
| 908 | |
| 909 | if (addr) sx->sync_addr = addr->next; |
| 910 | |
| 911 | /* Handle a response to DATA. If we have not had any good recipients, either |
| 912 | previously or in this block, the response is ignored. */ |
| 913 | |
| 914 | if (pending_DATA != 0 && |
| 915 | !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), |
| 916 | '3', ob->command_timeout)) |
| 917 | { |
| 918 | int code; |
| 919 | uschar *msg; |
| 920 | BOOL pass_message; |
| 921 | if (pending_DATA > 0 || (yield & 1) != 0) |
| 922 | { |
| 923 | if (errno == 0 && sx->buffer[0] == '4') |
| 924 | { |
| 925 | errno = ERRNO_DATA4XX; |
| 926 | sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 927 | } |
| 928 | return -3; |
| 929 | } |
| 930 | (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message); |
| 931 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " |
| 932 | "is in use and there were no good recipients\n", msg); |
| 933 | } |
| 934 | |
| 935 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if |
| 936 | present) received 3xx. If any RCPTs were handled and yielded anything other |
| 937 | than 4xx, yield will be set non-zero. */ |
| 938 | |
| 939 | return yield; |
| 940 | } |
| 941 | |
| 942 | |
| 943 | |
| 944 | /* Do the client side of smtp-level authentication */ |
| 945 | /* |
| 946 | Arguments: |
| 947 | buffer EHLO response from server (gets overwritten) |
| 948 | addrlist chain of potential addresses to deliver |
| 949 | host host to deliver to |
| 950 | ob transport options |
| 951 | ibp, obp comms channel control blocks |
| 952 | |
| 953 | Returns: |
| 954 | OK Success, or failed (but not required): global "smtp_authenticated" set |
| 955 | DEFER Failed authentication (and was required) |
| 956 | ERROR Internal problem |
| 957 | |
| 958 | FAIL_SEND Failed communications - transmit |
| 959 | FAIL - response |
| 960 | */ |
| 961 | |
| 962 | int |
| 963 | smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host, |
| 964 | smtp_transport_options_block *ob, BOOL is_esmtp, |
| 965 | smtp_inblock *ibp, smtp_outblock *obp) |
| 966 | { |
| 967 | int require_auth; |
| 968 | uschar *fail_reason = US"server did not advertise AUTH support"; |
| 969 | |
| 970 | smtp_authenticated = FALSE; |
| 971 | client_authenticator = client_authenticated_id = client_authenticated_sender = NULL; |
| 972 | require_auth = verify_check_given_host(&ob->hosts_require_auth, host); |
| 973 | |
| 974 | if (is_esmtp && !regex_AUTH) regex_AUTH = |
| 975 | regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)", |
| 976 | FALSE, TRUE); |
| 977 | |
| 978 | if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1)) |
| 979 | { |
| 980 | uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]); |
| 981 | expand_nmax = -1; /* reset */ |
| 982 | |
| 983 | /* Must not do this check until after we have saved the result of the |
| 984 | regex match above. */ |
| 985 | |
| 986 | if (require_auth == OK || |
| 987 | verify_check_given_host(&ob->hosts_try_auth, host) == OK) |
| 988 | { |
| 989 | auth_instance *au; |
| 990 | fail_reason = US"no common mechanisms were found"; |
| 991 | |
| 992 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); |
| 993 | |
| 994 | /* Scan the configured authenticators looking for one which is configured |
| 995 | for use as a client, which is not suppressed by client_condition, and |
| 996 | whose name matches an authentication mechanism supported by the server. |
| 997 | If one is found, attempt to authenticate by calling its client function. |
| 998 | */ |
| 999 | |
| 1000 | for (au = auths; !smtp_authenticated && au != NULL; au = au->next) |
| 1001 | { |
| 1002 | uschar *p = names; |
| 1003 | if (!au->client || |
| 1004 | (au->client_condition != NULL && |
| 1005 | !expand_check_condition(au->client_condition, au->name, |
| 1006 | US"client authenticator"))) |
| 1007 | { |
| 1008 | DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n", |
| 1009 | au->name, |
| 1010 | (au->client)? "client_condition is false" : |
| 1011 | "not configured as a client"); |
| 1012 | continue; |
| 1013 | } |
| 1014 | |
| 1015 | /* Loop to scan supported server mechanisms */ |
| 1016 | |
| 1017 | while (*p != 0) |
| 1018 | { |
| 1019 | int rc; |
| 1020 | int len = Ustrlen(au->public_name); |
| 1021 | while (isspace(*p)) p++; |
| 1022 | |
| 1023 | if (strncmpic(au->public_name, p, len) != 0 || |
| 1024 | (p[len] != 0 && !isspace(p[len]))) |
| 1025 | { |
| 1026 | while (*p != 0 && !isspace(*p)) p++; |
| 1027 | continue; |
| 1028 | } |
| 1029 | |
| 1030 | /* Found data for a listed mechanism. Call its client entry. Set |
| 1031 | a flag in the outblock so that data is overwritten after sending so |
| 1032 | that reflections don't show it. */ |
| 1033 | |
| 1034 | fail_reason = US"authentication attempt(s) failed"; |
| 1035 | obp->authenticating = TRUE; |
| 1036 | rc = (au->info->clientcode)(au, ibp, obp, |
| 1037 | ob->command_timeout, buffer, bufsize); |
| 1038 | obp->authenticating = FALSE; |
| 1039 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", |
| 1040 | au->name, rc); |
| 1041 | |
| 1042 | /* A temporary authentication failure must hold up delivery to |
| 1043 | this host. After a permanent authentication failure, we carry on |
| 1044 | to try other authentication methods. If all fail hard, try to |
| 1045 | deliver the message unauthenticated unless require_auth was set. */ |
| 1046 | |
| 1047 | switch(rc) |
| 1048 | { |
| 1049 | case OK: |
| 1050 | smtp_authenticated = TRUE; /* stops the outer loop */ |
| 1051 | client_authenticator = au->name; |
| 1052 | if (au->set_client_id != NULL) |
| 1053 | client_authenticated_id = expand_string(au->set_client_id); |
| 1054 | break; |
| 1055 | |
| 1056 | /* Failure after writing a command */ |
| 1057 | |
| 1058 | case FAIL_SEND: |
| 1059 | return FAIL_SEND; |
| 1060 | |
| 1061 | /* Failure after reading a response */ |
| 1062 | |
| 1063 | case FAIL: |
| 1064 | if (errno != 0 || buffer[0] != '5') return FAIL; |
| 1065 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", |
| 1066 | au->name, host->name, host->address, buffer); |
| 1067 | break; |
| 1068 | |
| 1069 | /* Failure by some other means. In effect, the authenticator |
| 1070 | decided it wasn't prepared to handle this case. Typically this |
| 1071 | is the result of "fail" in an expansion string. Do we need to |
| 1072 | log anything here? Feb 2006: a message is now put in the buffer |
| 1073 | if logging is required. */ |
| 1074 | |
| 1075 | case CANCELLED: |
| 1076 | if (*buffer != 0) |
| 1077 | log_write(0, LOG_MAIN, "%s authenticator cancelled " |
| 1078 | "authentication H=%s [%s] %s", au->name, host->name, |
| 1079 | host->address, buffer); |
| 1080 | break; |
| 1081 | |
| 1082 | /* Internal problem, message in buffer. */ |
| 1083 | |
| 1084 | case ERROR: |
| 1085 | set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer), |
| 1086 | DEFER, FALSE); |
| 1087 | return ERROR; |
| 1088 | } |
| 1089 | |
| 1090 | break; /* If not authenticated, try next authenticator */ |
| 1091 | } /* Loop for scanning supported server mechanisms */ |
| 1092 | } /* Loop for further authenticators */ |
| 1093 | } |
| 1094 | } |
| 1095 | |
| 1096 | /* If we haven't authenticated, but are required to, give up. */ |
| 1097 | |
| 1098 | if (require_auth == OK && !smtp_authenticated) |
| 1099 | { |
| 1100 | set_errno_nohost(addrlist, ERRNO_AUTHFAIL, |
| 1101 | string_sprintf("authentication required but %s", fail_reason), DEFER, |
| 1102 | FALSE); |
| 1103 | return DEFER; |
| 1104 | } |
| 1105 | |
| 1106 | return OK; |
| 1107 | } |
| 1108 | |
| 1109 | |
| 1110 | /* Construct AUTH appendix string for MAIL TO */ |
| 1111 | /* |
| 1112 | Arguments |
| 1113 | buffer to build string |
| 1114 | addrlist chain of potential addresses to deliver |
| 1115 | ob transport options |
| 1116 | |
| 1117 | Globals smtp_authenticated |
| 1118 | client_authenticated_sender |
| 1119 | Return True on error, otherwise buffer has (possibly empty) terminated string |
| 1120 | */ |
| 1121 | |
| 1122 | BOOL |
| 1123 | smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist, |
| 1124 | smtp_transport_options_block *ob) |
| 1125 | { |
| 1126 | uschar *local_authenticated_sender = authenticated_sender; |
| 1127 | |
| 1128 | #ifdef notdef |
| 1129 | debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N"); |
| 1130 | #endif |
| 1131 | |
| 1132 | if (ob->authenticated_sender != NULL) |
| 1133 | { |
| 1134 | uschar *new = expand_string(ob->authenticated_sender); |
| 1135 | if (new == NULL) |
| 1136 | { |
| 1137 | if (!expand_string_forcedfail) |
| 1138 | { |
| 1139 | uschar *message = string_sprintf("failed to expand " |
| 1140 | "authenticated_sender: %s", expand_string_message); |
| 1141 | set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE); |
| 1142 | return TRUE; |
| 1143 | } |
| 1144 | } |
| 1145 | else if (new[0] != 0) local_authenticated_sender = new; |
| 1146 | } |
| 1147 | |
| 1148 | /* Add the authenticated sender address if present */ |
| 1149 | |
| 1150 | if ((smtp_authenticated || ob->authenticated_sender_force) && |
| 1151 | local_authenticated_sender != NULL) |
| 1152 | { |
| 1153 | string_format(buffer, bufsize, " AUTH=%s", |
| 1154 | auth_xtextencode(local_authenticated_sender, |
| 1155 | Ustrlen(local_authenticated_sender))); |
| 1156 | client_authenticated_sender = string_copy(local_authenticated_sender); |
| 1157 | } |
| 1158 | else |
| 1159 | *buffer= 0; |
| 1160 | |
| 1161 | return FALSE; |
| 1162 | } |
| 1163 | |
| 1164 | |
| 1165 | |
| 1166 | #ifdef EXPERIMENTAL_DANE |
| 1167 | /* Lookup TLSA record for host/port. |
| 1168 | Return: OK success with dnssec; DANE mode |
| 1169 | DEFER Do not use this host now, may retry later |
| 1170 | FAIL_FORCED No TLSA record; DANE not usable |
| 1171 | FAIL Do not use this connection |
| 1172 | */ |
| 1173 | |
| 1174 | int |
| 1175 | tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required) |
| 1176 | { |
| 1177 | /* move this out to host.c given the similarity to dns_lookup() ? */ |
| 1178 | uschar buffer[300]; |
| 1179 | const uschar * fullname = buffer; |
| 1180 | |
| 1181 | /* TLSA lookup string */ |
| 1182 | (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name); |
| 1183 | |
| 1184 | switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname)) |
| 1185 | { |
| 1186 | case DNS_SUCCEED: |
| 1187 | if (!dns_is_secure(dnsa)) |
| 1188 | { |
| 1189 | log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC"); |
| 1190 | return DEFER; |
| 1191 | } |
| 1192 | return OK; |
| 1193 | |
| 1194 | case DNS_AGAIN: |
| 1195 | return DEFER; /* just defer this TLS'd conn */ |
| 1196 | |
| 1197 | case DNS_NODATA: /* no TLSA RR for this lookup */ |
| 1198 | case DNS_NOMATCH: /* no records at all for this lookup */ |
| 1199 | return dane_required ? FAIL : FAIL_FORCED; |
| 1200 | |
| 1201 | default: |
| 1202 | case DNS_FAIL: |
| 1203 | return dane_required ? FAIL : DEFER; |
| 1204 | } |
| 1205 | } |
| 1206 | #endif |
| 1207 | |
| 1208 | |
| 1209 | |
| 1210 | typedef struct smtp_compare_s |
| 1211 | { |
| 1212 | uschar *current_sender_address; |
| 1213 | struct transport_instance *tblock; |
| 1214 | } smtp_compare_t; |
| 1215 | |
| 1216 | |
| 1217 | /* Create a unique string that identifies this message, it is based on |
| 1218 | sender_address, helo_data and tls_certificate if enabled. |
| 1219 | */ |
| 1220 | |
| 1221 | static uschar * |
| 1222 | smtp_local_identity(uschar * sender, struct transport_instance * tblock) |
| 1223 | { |
| 1224 | address_item * addr1; |
| 1225 | uschar * if1 = US""; |
| 1226 | uschar * helo1 = US""; |
| 1227 | #ifdef SUPPORT_TLS |
| 1228 | uschar * tlsc1 = US""; |
| 1229 | #endif |
| 1230 | uschar * save_sender_address = sender_address; |
| 1231 | uschar * local_identity = NULL; |
| 1232 | smtp_transport_options_block * ob = |
| 1233 | (smtp_transport_options_block *)tblock->options_block; |
| 1234 | |
| 1235 | sender_address = sender; |
| 1236 | |
| 1237 | addr1 = deliver_make_addr (sender, TRUE); |
| 1238 | deliver_set_expansions(addr1); |
| 1239 | |
| 1240 | if (ob->interface) |
| 1241 | if1 = expand_string(ob->interface); |
| 1242 | |
| 1243 | if (ob->helo_data) |
| 1244 | helo1 = expand_string(ob->helo_data); |
| 1245 | |
| 1246 | #ifdef SUPPORT_TLS |
| 1247 | if (ob->tls_certificate) |
| 1248 | tlsc1 = expand_string(ob->tls_certificate); |
| 1249 | local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1); |
| 1250 | #else |
| 1251 | local_identity = string_sprintf ("%s^%s", if1, helo1); |
| 1252 | #endif |
| 1253 | |
| 1254 | deliver_set_expansions(NULL); |
| 1255 | sender_address = save_sender_address; |
| 1256 | |
| 1257 | return local_identity; |
| 1258 | } |
| 1259 | |
| 1260 | |
| 1261 | |
| 1262 | /* This routine is a callback that is called from transport_check_waiting. |
| 1263 | This function will evaluate the incoming message versus the previous |
| 1264 | message. If the incoming message is using a different local identity then |
| 1265 | we will veto this new message. */ |
| 1266 | |
| 1267 | static BOOL |
| 1268 | smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare) |
| 1269 | { |
| 1270 | uschar * message_local_identity, |
| 1271 | * current_local_identity, |
| 1272 | * new_sender_address; |
| 1273 | |
| 1274 | current_local_identity = |
| 1275 | smtp_local_identity(s_compare->current_sender_address, s_compare->tblock); |
| 1276 | |
| 1277 | if (!(new_sender_address = deliver_get_sender_address(message_id))) |
| 1278 | return 0; |
| 1279 | |
| 1280 | message_local_identity = |
| 1281 | smtp_local_identity(new_sender_address, s_compare->tblock); |
| 1282 | |
| 1283 | return Ustrcmp(current_local_identity, message_local_identity) == 0; |
| 1284 | } |
| 1285 | |
| 1286 | |
| 1287 | |
| 1288 | static uschar |
| 1289 | ehlo_response(uschar * buf, uschar checks) |
| 1290 | { |
| 1291 | size_t bsize = Ustrlen(buf); |
| 1292 | |
| 1293 | #ifdef SUPPORT_TLS |
| 1294 | if ( checks & PEER_OFFERED_TLS |
| 1295 | && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1296 | checks &= ~PEER_OFFERED_TLS; |
| 1297 | #endif |
| 1298 | |
| 1299 | if ( checks & PEER_OFFERED_IGNQ |
| 1300 | && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0, |
| 1301 | PCRE_EOPT, NULL, 0) < 0) |
| 1302 | checks &= ~PEER_OFFERED_IGNQ; |
| 1303 | |
| 1304 | if ( checks & PEER_OFFERED_CHUNKING |
| 1305 | && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1306 | checks &= ~PEER_OFFERED_CHUNKING; |
| 1307 | |
| 1308 | #ifndef DISABLE_PRDR |
| 1309 | if ( checks & PEER_OFFERED_PRDR |
| 1310 | && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1311 | checks &= ~PEER_OFFERED_PRDR; |
| 1312 | #endif |
| 1313 | |
| 1314 | #ifdef SUPPORT_I18N |
| 1315 | if ( checks & PEER_OFFERED_UTF8 |
| 1316 | && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1317 | checks &= ~PEER_OFFERED_UTF8; |
| 1318 | #endif |
| 1319 | |
| 1320 | if ( checks & PEER_OFFERED_DSN |
| 1321 | && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1322 | checks &= ~PEER_OFFERED_DSN; |
| 1323 | |
| 1324 | if ( checks & PEER_OFFERED_PIPE |
| 1325 | && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0, |
| 1326 | PCRE_EOPT, NULL, 0) < 0) |
| 1327 | checks &= ~PEER_OFFERED_PIPE; |
| 1328 | |
| 1329 | if ( checks & PEER_OFFERED_SIZE |
| 1330 | && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1331 | checks &= ~PEER_OFFERED_SIZE; |
| 1332 | |
| 1333 | return checks; |
| 1334 | } |
| 1335 | |
| 1336 | |
| 1337 | |
| 1338 | /* Callback for emitting a BDAT data chunk header. |
| 1339 | |
| 1340 | If given a nonzero size, first flush any buffered SMTP commands |
| 1341 | then emit the command. |
| 1342 | |
| 1343 | Reap previous SMTP command responses if requested. |
| 1344 | Reap one SMTP command response if requested. |
| 1345 | |
| 1346 | Returns: OK or ERROR |
| 1347 | */ |
| 1348 | |
| 1349 | static int |
| 1350 | smtp_chunk_cmd_callback(int fd, transport_ctx * tctx, |
| 1351 | unsigned chunk_size, unsigned flags) |
| 1352 | { |
| 1353 | smtp_transport_options_block * ob = |
| 1354 | (smtp_transport_options_block *)(tctx->tblock->options_block); |
| 1355 | smtp_context * sx = tctx->smtp_context; |
| 1356 | int cmd_count = 0; |
| 1357 | int prev_cmd_count; |
| 1358 | |
| 1359 | /* Write SMTP chunk header command */ |
| 1360 | |
| 1361 | if (chunk_size > 0) |
| 1362 | { |
| 1363 | if((cmd_count = smtp_write_command(&sx->outblock, FALSE, "BDAT %u%s\r\n", |
| 1364 | chunk_size, |
| 1365 | flags & tc_chunk_last ? " LAST" : "") |
| 1366 | ) < 0) return ERROR; |
| 1367 | if (flags & tc_chunk_last) |
| 1368 | data_command = string_copy(big_buffer); /* Save for later error message */ |
| 1369 | } |
| 1370 | |
| 1371 | prev_cmd_count = cmd_count += sx->cmd_count; |
| 1372 | |
| 1373 | /* Reap responses for any previous, but not one we just emitted */ |
| 1374 | |
| 1375 | if (chunk_size > 0) |
| 1376 | prev_cmd_count--; |
| 1377 | if (sx->pending_BDAT) |
| 1378 | prev_cmd_count--; |
| 1379 | |
| 1380 | if (flags & tc_reap_prev && prev_cmd_count > 0) |
| 1381 | { |
| 1382 | DEBUG(D_transport) debug_printf("look for %d responses" |
| 1383 | " for previous pipelined cmds\n", prev_cmd_count); |
| 1384 | |
| 1385 | switch(sync_responses(sx, prev_cmd_count, 0)) |
| 1386 | { |
| 1387 | case 1: /* 2xx (only) => OK */ |
| 1388 | case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 1389 | case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */ |
| 1390 | case 0: break; /* No 2xx or 5xx, but no probs */ |
| 1391 | |
| 1392 | case -1: /* Timeout on RCPT */ |
| 1393 | default: return ERROR; /* I/O error, or any MAIL/DATA error */ |
| 1394 | } |
| 1395 | cmd_count = 1; |
| 1396 | if (!sx->pending_BDAT) |
| 1397 | pipelining_active = FALSE; |
| 1398 | } |
| 1399 | |
| 1400 | /* Reap response for an outstanding BDAT */ |
| 1401 | |
| 1402 | if (sx->pending_BDAT) |
| 1403 | { |
| 1404 | DEBUG(D_transport) debug_printf("look for one response for BDAT\n"); |
| 1405 | |
| 1406 | if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2', |
| 1407 | ob->command_timeout)) |
| 1408 | { |
| 1409 | if (errno == 0 && sx->buffer[0] == '4') |
| 1410 | { |
| 1411 | errno = ERRNO_DATA4XX; /*XXX does this actually get used? */ |
| 1412 | sx->addrlist->more_errno |= |
| 1413 | ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 1414 | } |
| 1415 | return ERROR; |
| 1416 | } |
| 1417 | cmd_count--; |
| 1418 | sx->pending_BDAT = FALSE; |
| 1419 | pipelining_active = FALSE; |
| 1420 | } |
| 1421 | else if (chunk_size > 0) |
| 1422 | sx->pending_BDAT = TRUE; |
| 1423 | |
| 1424 | |
| 1425 | sx->cmd_count = cmd_count; |
| 1426 | return OK; |
| 1427 | } |
| 1428 | |
| 1429 | |
| 1430 | |
| 1431 | /************************************************* |
| 1432 | * Make connection for given message * |
| 1433 | *************************************************/ |
| 1434 | |
| 1435 | /* |
| 1436 | Arguments: |
| 1437 | ctx connection context |
| 1438 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for |
| 1439 | a second attempt after TLS initialization fails |
| 1440 | |
| 1441 | Returns: OK - the connection was made and the delivery attempted; |
| 1442 | fd is set in the conn context, tls_out set up. |
| 1443 | DEFER - the connection could not be made, or something failed |
| 1444 | while setting up the SMTP session, or there was a |
| 1445 | non-message-specific error, such as a timeout. |
| 1446 | ERROR - helo_data or add_headers or authenticated_sender is |
| 1447 | specified for this transport, and the string failed |
| 1448 | to expand |
| 1449 | */ |
| 1450 | int |
| 1451 | smtp_setup_conn(smtp_context * sx, BOOL suppress_tls) |
| 1452 | { |
| 1453 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
| 1454 | dns_answer tlsa_dnsa; |
| 1455 | #endif |
| 1456 | BOOL pass_message = FALSE; |
| 1457 | uschar * message = NULL; |
| 1458 | int yield = OK; |
| 1459 | int rc; |
| 1460 | |
| 1461 | sx->ob = (smtp_transport_options_block *) sx->tblock->options_block; |
| 1462 | |
| 1463 | sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0; |
| 1464 | sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0; |
| 1465 | sx->ok = FALSE; |
| 1466 | sx->send_rset = TRUE; |
| 1467 | sx->send_quit = TRUE; |
| 1468 | sx->setting_up = TRUE; |
| 1469 | sx->esmtp = TRUE; |
| 1470 | sx->esmtp_sent = FALSE; |
| 1471 | #ifdef SUPPORT_I18N |
| 1472 | sx->utf8_needed = FALSE; |
| 1473 | #endif |
| 1474 | sx->dsn_all_lasthop = TRUE; |
| 1475 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
| 1476 | sx->dane = FALSE; |
| 1477 | sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK; |
| 1478 | #endif |
| 1479 | |
| 1480 | if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999; |
| 1481 | sx->peer_offered = 0; |
| 1482 | sx->igquotstr = US""; |
| 1483 | if (!sx->helo_data) sx->helo_data = sx->ob->helo_data; |
| 1484 | #ifdef EXPERIMENTAL_DSN_INFO |
| 1485 | sx->smtp_greeting = NULL; |
| 1486 | sx->helo_response = NULL; |
| 1487 | #endif |
| 1488 | |
| 1489 | smtp_command = US"initial connection"; |
| 1490 | sx->buffer[0] = '\0'; |
| 1491 | |
| 1492 | /* Set up the buffer for reading SMTP response packets. */ |
| 1493 | |
| 1494 | sx->inblock.buffer = sx->inbuffer; |
| 1495 | sx->inblock.buffersize = sizeof(sx->inbuffer); |
| 1496 | sx->inblock.ptr = sx->inbuffer; |
| 1497 | sx->inblock.ptrend = sx->inbuffer; |
| 1498 | |
| 1499 | /* Set up the buffer for holding SMTP commands while pipelining */ |
| 1500 | |
| 1501 | sx->outblock.buffer = sx->outbuffer; |
| 1502 | sx->outblock.buffersize = sizeof(sx->outbuffer); |
| 1503 | sx->outblock.ptr = sx->outbuffer; |
| 1504 | sx->outblock.cmd_count = 0; |
| 1505 | sx->outblock.authenticating = FALSE; |
| 1506 | |
| 1507 | /* Reset the parameters of a TLS session. */ |
| 1508 | |
| 1509 | tls_out.bits = 0; |
| 1510 | tls_out.cipher = NULL; /* the one we may use for this transport */ |
| 1511 | tls_out.ourcert = NULL; |
| 1512 | tls_out.peercert = NULL; |
| 1513 | tls_out.peerdn = NULL; |
| 1514 | #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS) |
| 1515 | tls_out.sni = NULL; |
| 1516 | #endif |
| 1517 | tls_out.ocsp = OCSP_NOT_REQ; |
| 1518 | |
| 1519 | /* Flip the legacy TLS-related variables over to the outbound set in case |
| 1520 | they're used in the context of the transport. Don't bother resetting |
| 1521 | afterward (when being used by a transport) as we're in a subprocess. |
| 1522 | For verify, unflipped once the callout is dealt with */ |
| 1523 | |
| 1524 | tls_modify_variables(&tls_out); |
| 1525 | |
| 1526 | #ifndef SUPPORT_TLS |
| 1527 | if (sx->smtps) |
| 1528 | { |
| 1529 | set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available", |
| 1530 | DEFER, FALSE); |
| 1531 | return ERROR; |
| 1532 | } |
| 1533 | #endif |
| 1534 | |
| 1535 | /* Make a connection to the host if this isn't a continued delivery, and handle |
| 1536 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled |
| 1537 | specially so they can be identified for retries. */ |
| 1538 | |
| 1539 | if (continue_hostname == NULL) |
| 1540 | { |
| 1541 | if (sx->verify) |
| 1542 | HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port); |
| 1543 | |
| 1544 | /* This puts port into host->port */ |
| 1545 | sx->inblock.sock = sx->outblock.sock = |
| 1546 | smtp_connect(sx->host, sx->host_af, sx->port, sx->interface, |
| 1547 | sx->ob->connect_timeout, sx->tblock); |
| 1548 | |
| 1549 | if (sx->inblock.sock < 0) |
| 1550 | { |
| 1551 | uschar * msg = NULL; |
| 1552 | if (sx->verify) |
| 1553 | { |
| 1554 | msg = strerror(errno); |
| 1555 | HDEBUG(D_verify) debug_printf("connect: %s\n", msg); |
| 1556 | } |
| 1557 | set_errno_nohost(sx->addrlist, |
| 1558 | errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno, |
| 1559 | sx->verify ? string_sprintf("could not connect: %s", msg) |
| 1560 | : NULL, |
| 1561 | DEFER, FALSE); |
| 1562 | sx->send_quit = FALSE; |
| 1563 | return DEFER; |
| 1564 | } |
| 1565 | |
| 1566 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
| 1567 | { |
| 1568 | tls_out.dane_verified = FALSE; |
| 1569 | tls_out.tlsa_usage = 0; |
| 1570 | |
| 1571 | if (sx->host->dnssec == DS_YES) |
| 1572 | { |
| 1573 | if( sx->dane_required |
| 1574 | || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK |
| 1575 | ) |
| 1576 | switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required)) |
| 1577 | { |
| 1578 | case OK: sx->dane = TRUE; break; |
| 1579 | case FAIL_FORCED: break; |
| 1580 | default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER, |
| 1581 | string_sprintf("DANE error: tlsa lookup %s", |
| 1582 | rc == DEFER ? "DEFER" : "FAIL"), |
| 1583 | rc, FALSE); |
| 1584 | return rc; |
| 1585 | } |
| 1586 | } |
| 1587 | else if (sx->dane_required) |
| 1588 | { |
| 1589 | set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER, |
| 1590 | string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name), |
| 1591 | FAIL, FALSE); |
| 1592 | return FAIL; |
| 1593 | } |
| 1594 | |
| 1595 | if (sx->dane) |
| 1596 | sx->ob->tls_tempfail_tryclear = FALSE; |
| 1597 | } |
| 1598 | #endif /*DANE*/ |
| 1599 | |
| 1600 | /* Expand the greeting message while waiting for the initial response. (Makes |
| 1601 | sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is |
| 1602 | delayed till here so that $sending_interface and $sending_port are set. */ |
| 1603 | |
| 1604 | if (sx->helo_data) |
| 1605 | if (!(sx->helo_data = expand_string(sx->helo_data))) |
| 1606 | if (sx->verify) |
| 1607 | log_write(0, LOG_MAIN|LOG_PANIC, |
| 1608 | "<%s>: failed to expand transport's helo_data value for callout: %s", |
| 1609 | sx->addrlist->address, expand_string_message); |
| 1610 | |
| 1611 | #ifdef SUPPORT_I18N |
| 1612 | if (sx->helo_data) |
| 1613 | { |
| 1614 | expand_string_message = NULL; |
| 1615 | if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data, |
| 1616 | &expand_string_message)), |
| 1617 | expand_string_message) |
| 1618 | if (sx->verify) |
| 1619 | log_write(0, LOG_MAIN|LOG_PANIC, |
| 1620 | "<%s>: failed to expand transport's helo_data value for callout: %s", |
| 1621 | sx->addrlist->address, expand_string_message); |
| 1622 | else |
| 1623 | sx->helo_data = NULL; |
| 1624 | } |
| 1625 | #endif |
| 1626 | |
| 1627 | /* The first thing is to wait for an initial OK response. The dreaded "goto" |
| 1628 | is nevertheless a reasonably clean way of programming this kind of logic, |
| 1629 | where you want to escape on any error. */ |
| 1630 | |
| 1631 | if (!sx->smtps) |
| 1632 | { |
| 1633 | BOOL good_response; |
| 1634 | |
| 1635 | #ifdef TCP_QUICKACK |
| 1636 | (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off)); |
| 1637 | #endif |
| 1638 | good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), |
| 1639 | '2', sx->ob->command_timeout); |
| 1640 | #ifdef EXPERIMENTAL_DSN_INFO |
| 1641 | sx->smtp_greeting = string_copy(sx->buffer); |
| 1642 | #endif |
| 1643 | if (!good_response) goto RESPONSE_FAILED; |
| 1644 | |
| 1645 | #ifndef DISABLE_EVENT |
| 1646 | { |
| 1647 | uschar * s; |
| 1648 | lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes" |
| 1649 | : sx->host->dnssec==DS_NO ? US"no" : NULL; |
| 1650 | s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer); |
| 1651 | if (s) |
| 1652 | { |
| 1653 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, |
| 1654 | string_sprintf("deferred by smtp:connect event expansion: %s", s), |
| 1655 | DEFER, FALSE); |
| 1656 | yield = DEFER; |
| 1657 | goto SEND_QUIT; |
| 1658 | } |
| 1659 | } |
| 1660 | #endif |
| 1661 | |
| 1662 | /* Now check if the helo_data expansion went well, and sign off cleanly if |
| 1663 | it didn't. */ |
| 1664 | |
| 1665 | if (!sx->helo_data) |
| 1666 | { |
| 1667 | message = string_sprintf("failed to expand helo_data: %s", |
| 1668 | expand_string_message); |
| 1669 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE); |
| 1670 | yield = DEFER; |
| 1671 | goto SEND_QUIT; |
| 1672 | } |
| 1673 | } |
| 1674 | |
| 1675 | /** Debugging without sending a message |
| 1676 | sx->addrlist->transport_return = DEFER; |
| 1677 | goto SEND_QUIT; |
| 1678 | **/ |
| 1679 | |
| 1680 | /* Errors that occur after this point follow an SMTP command, which is |
| 1681 | left in big_buffer by smtp_write_command() for use in error messages. */ |
| 1682 | |
| 1683 | smtp_command = big_buffer; |
| 1684 | |
| 1685 | /* Tell the remote who we are... |
| 1686 | |
| 1687 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the |
| 1688 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the |
| 1689 | greeting is of this form. The assumption was that the far end supports it |
| 1690 | properly... but experience shows that there are some that give 5xx responses, |
| 1691 | even though the banner includes "ESMTP" (there's a bloody-minded one that |
| 1692 | says "ESMTP not spoken here"). Cope with that case. |
| 1693 | |
| 1694 | September 2000: Time has passed, and it seems reasonable now to always send |
| 1695 | EHLO at the start. It is also convenient to make the change while installing |
| 1696 | the TLS stuff. |
| 1697 | |
| 1698 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" |
| 1699 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There |
| 1700 | would be no way to send out the mails, so there is now a host list |
| 1701 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the |
| 1702 | PIPELINING problem as well. Maybe it can also be useful to cure other |
| 1703 | problems with broken servers. |
| 1704 | |
| 1705 | Exim originally sent "Helo" at this point and ran for nearly a year that way. |
| 1706 | Then somebody tried it with a Microsoft mailer... It seems that all other |
| 1707 | mailers use upper case for some reason (the RFC is quite clear about case |
| 1708 | independence) so, for peace of mind, I gave in. */ |
| 1709 | |
| 1710 | sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK; |
| 1711 | |
| 1712 | /* Alas; be careful, since this goto is not an error-out, so conceivably |
| 1713 | we might set data between here and the target which we assume to exist |
| 1714 | and be usable. I can see this coming back to bite us. */ |
| 1715 | #ifdef SUPPORT_TLS |
| 1716 | if (sx->smtps) |
| 1717 | { |
| 1718 | smtp_peer_options |= PEER_OFFERED_TLS; |
| 1719 | suppress_tls = FALSE; |
| 1720 | sx->ob->tls_tempfail_tryclear = FALSE; |
| 1721 | smtp_command = US"SSL-on-connect"; |
| 1722 | goto TLS_NEGOTIATE; |
| 1723 | } |
| 1724 | #endif |
| 1725 | |
| 1726 | if (sx->esmtp) |
| 1727 | { |
| 1728 | if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n", |
| 1729 | sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0) |
| 1730 | goto SEND_FAILED; |
| 1731 | sx->esmtp_sent = TRUE; |
| 1732 | if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2', |
| 1733 | sx->ob->command_timeout)) |
| 1734 | { |
| 1735 | if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp) |
| 1736 | { |
| 1737 | #ifdef EXPERIMENTAL_DSN_INFO |
| 1738 | sx->helo_response = string_copy(sx->buffer); |
| 1739 | #endif |
| 1740 | goto RESPONSE_FAILED; |
| 1741 | } |
| 1742 | sx->esmtp = FALSE; |
| 1743 | } |
| 1744 | #ifdef EXPERIMENTAL_DSN_INFO |
| 1745 | sx->helo_response = string_copy(sx->buffer); |
| 1746 | #endif |
| 1747 | } |
| 1748 | else |
| 1749 | DEBUG(D_transport) |
| 1750 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); |
| 1751 | |
| 1752 | if (!sx->esmtp) |
| 1753 | { |
| 1754 | BOOL good_response; |
| 1755 | int n = sizeof(sx->buffer); |
| 1756 | uschar * rsp = sx->buffer; |
| 1757 | |
| 1758 | if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2) |
| 1759 | { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; } |
| 1760 | |
| 1761 | if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0) |
| 1762 | goto SEND_FAILED; |
| 1763 | good_response = smtp_read_response(&sx->inblock, rsp, n, |
| 1764 | '2', sx->ob->command_timeout); |
| 1765 | #ifdef EXPERIMENTAL_DSN_INFO |
| 1766 | sx->helo_response = string_copy(rsp); |
| 1767 | #endif |
| 1768 | if (!good_response) |
| 1769 | { |
| 1770 | /* Handle special logging for a closed connection after HELO |
| 1771 | when had previously sent EHLO */ |
| 1772 | |
| 1773 | if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET)) |
| 1774 | { |
| 1775 | errno = ERRNO_SMTPCLOSED; |
| 1776 | goto EHLOHELO_FAILED; |
| 1777 | } |
| 1778 | Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2); |
| 1779 | goto RESPONSE_FAILED; |
| 1780 | } |
| 1781 | } |
| 1782 | |
| 1783 | sx->peer_offered = smtp_peer_options = 0; |
| 1784 | |
| 1785 | if (sx->esmtp || sx->lmtp) |
| 1786 | { |
| 1787 | sx->peer_offered = ehlo_response(sx->buffer, |
| 1788 | PEER_OFFERED_TLS /* others checked later */ |
| 1789 | ); |
| 1790 | |
| 1791 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ |
| 1792 | |
| 1793 | #ifdef SUPPORT_TLS |
| 1794 | smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS; |
| 1795 | #endif |
| 1796 | } |
| 1797 | } |
| 1798 | |
| 1799 | /* For continuing deliveries down the same channel, the socket is the standard |
| 1800 | input, and we don't need to redo EHLO here (but may need to do so for TLS - see |
| 1801 | below). Set up the pointer to where subsequent commands will be left, for |
| 1802 | error messages. Note that smtp_peer_options will have been |
| 1803 | set from the command line if they were set in the process that passed the |
| 1804 | connection on. */ |
| 1805 | |
| 1806 | /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c |
| 1807 | as the continue goes via transport_pass_socket() and doublefork and exec. |
| 1808 | It does not wait. Unclear how we keep separate host's responses |
| 1809 | separate - we could match up by host ip+port as a bodge. */ |
| 1810 | |
| 1811 | else |
| 1812 | { |
| 1813 | sx->inblock.sock = sx->outblock.sock = fileno(stdin); |
| 1814 | smtp_command = big_buffer; |
| 1815 | sx->host->port = sx->port; /* Record the port that was used */ |
| 1816 | sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */ |
| 1817 | } |
| 1818 | |
| 1819 | /* If TLS is available on this connection, whether continued or not, attempt to |
| 1820 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, |
| 1821 | send another EHLO - the server may give a different answer in secure mode. We |
| 1822 | use a separate buffer for reading the response to STARTTLS so that if it is |
| 1823 | negative, the original EHLO data is available for subsequent analysis, should |
| 1824 | the client not be required to use TLS. If the response is bad, copy the buffer |
| 1825 | for error analysis. */ |
| 1826 | |
| 1827 | #ifdef SUPPORT_TLS |
| 1828 | if ( smtp_peer_options & PEER_OFFERED_TLS |
| 1829 | && !suppress_tls |
| 1830 | && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK |
| 1831 | && ( !sx->verify |
| 1832 | || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK |
| 1833 | ) ) |
| 1834 | { |
| 1835 | uschar buffer2[4096]; |
| 1836 | if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0) |
| 1837 | goto SEND_FAILED; |
| 1838 | |
| 1839 | /* If there is an I/O error, transmission of this message is deferred. If |
| 1840 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is |
| 1841 | false, we also defer. However, if there is a temporary rejection of STARTTLS |
| 1842 | and tls_tempfail_tryclear is true, or if there is an outright rejection of |
| 1843 | STARTTLS, we carry on. This means we will try to send the message in clear, |
| 1844 | unless the host is in hosts_require_tls (tested below). */ |
| 1845 | |
| 1846 | if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2', |
| 1847 | sx->ob->command_timeout)) |
| 1848 | { |
| 1849 | if ( errno != 0 |
| 1850 | || buffer2[0] == 0 |
| 1851 | || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear) |
| 1852 | ) |
| 1853 | { |
| 1854 | Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer)); |
| 1855 | sx->buffer[sizeof(sx->buffer)-1] = '\0'; |
| 1856 | goto RESPONSE_FAILED; |
| 1857 | } |
| 1858 | } |
| 1859 | |
| 1860 | /* STARTTLS accepted: try to negotiate a TLS session. */ |
| 1861 | |
| 1862 | else |
| 1863 | TLS_NEGOTIATE: |
| 1864 | { |
| 1865 | address_item * addr; |
| 1866 | uschar * errstr; |
| 1867 | int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock, |
| 1868 | # ifdef EXPERIMENTAL_DANE |
| 1869 | sx->dane ? &tlsa_dnsa : NULL, |
| 1870 | # endif |
| 1871 | &errstr); |
| 1872 | |
| 1873 | /* TLS negotiation failed; give an error. From outside, this function may |
| 1874 | be called again to try in clear on a new connection, if the options permit |
| 1875 | it for this host. */ |
| 1876 | |
| 1877 | if (rc != OK) |
| 1878 | { |
| 1879 | # ifdef EXPERIMENTAL_DANE |
| 1880 | if (sx->dane) log_write(0, LOG_MAIN, |
| 1881 | "DANE attempt failed; TLS connection to %s [%s]: %s", |
| 1882 | sx->host->name, sx->host->address, errstr); |
| 1883 | # endif |
| 1884 | |
| 1885 | errno = ERRNO_TLSFAILURE; |
| 1886 | message = string_sprintf("TLS session: %s", errstr); |
| 1887 | sx->send_quit = FALSE; |
| 1888 | goto TLS_FAILED; |
| 1889 | } |
| 1890 | |
| 1891 | /* TLS session is set up */ |
| 1892 | |
| 1893 | smtp_peer_options_wrap = smtp_peer_options; |
| 1894 | for (addr = sx->addrlist; addr; addr = addr->next) |
| 1895 | if (addr->transport_return == PENDING_DEFER) |
| 1896 | { |
| 1897 | addr->cipher = tls_out.cipher; |
| 1898 | addr->ourcert = tls_out.ourcert; |
| 1899 | addr->peercert = tls_out.peercert; |
| 1900 | addr->peerdn = tls_out.peerdn; |
| 1901 | addr->ocsp = tls_out.ocsp; |
| 1902 | } |
| 1903 | } |
| 1904 | } |
| 1905 | |
| 1906 | /* if smtps, we'll have smtp_command set to something else; always safe to |
| 1907 | reset it here. */ |
| 1908 | smtp_command = big_buffer; |
| 1909 | |
| 1910 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If |
| 1911 | helo_data is null, we are dealing with a connection that was passed from |
| 1912 | another process, and so we won't have expanded helo_data above. We have to |
| 1913 | expand it here. $sending_ip_address and $sending_port are set up right at the |
| 1914 | start of the Exim process (in exim.c). */ |
| 1915 | |
| 1916 | if (tls_out.active >= 0) |
| 1917 | { |
| 1918 | char *greeting_cmd; |
| 1919 | BOOL good_response; |
| 1920 | |
| 1921 | if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data))) |
| 1922 | { |
| 1923 | uschar *message = string_sprintf("failed to expand helo_data: %s", |
| 1924 | expand_string_message); |
| 1925 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE); |
| 1926 | yield = DEFER; |
| 1927 | goto SEND_QUIT; |
| 1928 | } |
| 1929 | |
| 1930 | /* For SMTPS we need to wait for the initial OK response. */ |
| 1931 | if (sx->smtps) |
| 1932 | { |
| 1933 | good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), |
| 1934 | '2', sx->ob->command_timeout); |
| 1935 | #ifdef EXPERIMENTAL_DSN_INFO |
| 1936 | sx->smtp_greeting = string_copy(sx->buffer); |
| 1937 | #endif |
| 1938 | if (!good_response) goto RESPONSE_FAILED; |
| 1939 | } |
| 1940 | |
| 1941 | if (sx->esmtp) |
| 1942 | greeting_cmd = "EHLO"; |
| 1943 | else |
| 1944 | { |
| 1945 | greeting_cmd = "HELO"; |
| 1946 | DEBUG(D_transport) |
| 1947 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); |
| 1948 | } |
| 1949 | |
| 1950 | if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n", |
| 1951 | sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0) |
| 1952 | goto SEND_FAILED; |
| 1953 | good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), |
| 1954 | '2', sx->ob->command_timeout); |
| 1955 | #ifdef EXPERIMENTAL_DSN_INFO |
| 1956 | sx->helo_response = string_copy(sx->buffer); |
| 1957 | #endif |
| 1958 | if (!good_response) goto RESPONSE_FAILED; |
| 1959 | smtp_peer_options = 0; |
| 1960 | } |
| 1961 | |
| 1962 | /* If the host is required to use a secure channel, ensure that we |
| 1963 | have one. */ |
| 1964 | |
| 1965 | else if ( sx->smtps |
| 1966 | # ifdef EXPERIMENTAL_DANE |
| 1967 | || sx->dane |
| 1968 | # endif |
| 1969 | || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK |
| 1970 | ) |
| 1971 | { |
| 1972 | errno = ERRNO_TLSREQUIRED; |
| 1973 | message = string_sprintf("a TLS session is required, but %s", |
| 1974 | smtp_peer_options & PEER_OFFERED_TLS |
| 1975 | ? "an attempt to start TLS failed" : "the server did not offer TLS support"); |
| 1976 | goto TLS_FAILED; |
| 1977 | } |
| 1978 | #endif /*SUPPORT_TLS*/ |
| 1979 | |
| 1980 | /* If TLS is active, we have just started it up and re-done the EHLO command, |
| 1981 | so its response needs to be analyzed. If TLS is not active and this is a |
| 1982 | continued session down a previously-used socket, we haven't just done EHLO, so |
| 1983 | we skip this. */ |
| 1984 | |
| 1985 | if (continue_hostname == NULL |
| 1986 | #ifdef SUPPORT_TLS |
| 1987 | || tls_out.active >= 0 |
| 1988 | #endif |
| 1989 | ) |
| 1990 | { |
| 1991 | if (sx->esmtp || sx->lmtp) |
| 1992 | { |
| 1993 | sx->peer_offered = ehlo_response(sx->buffer, |
| 1994 | 0 /* no TLS */ |
| 1995 | | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0) |
| 1996 | | PEER_OFFERED_CHUNKING |
| 1997 | | PEER_OFFERED_PRDR |
| 1998 | #ifdef SUPPORT_I18N |
| 1999 | | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0) |
| 2000 | /*XXX if we hand peercaps on to continued-conn processes, |
| 2001 | must not depend on this addr */ |
| 2002 | #endif |
| 2003 | | PEER_OFFERED_DSN |
| 2004 | | PEER_OFFERED_PIPE |
| 2005 | | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0) |
| 2006 | ); |
| 2007 | |
| 2008 | /* Set for IGNOREQUOTA if the response to LHLO specifies support and the |
| 2009 | lmtp_ignore_quota option was set. */ |
| 2010 | |
| 2011 | sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US""; |
| 2012 | |
| 2013 | /* If the response to EHLO specified support for the SIZE parameter, note |
| 2014 | this, provided size_addition is non-negative. */ |
| 2015 | |
| 2016 | smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE; |
| 2017 | |
| 2018 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched |
| 2019 | the current host, esmtp will be false, so PIPELINING can never be used. If |
| 2020 | the current host matches hosts_avoid_pipelining, don't do it. */ |
| 2021 | |
| 2022 | if ( sx->peer_offered & PEER_OFFERED_PIPE |
| 2023 | && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK) |
| 2024 | smtp_peer_options |= PEER_OFFERED_PIPE; |
| 2025 | |
| 2026 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", |
| 2027 | smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not "); |
| 2028 | |
| 2029 | if ( sx->peer_offered & PEER_OFFERED_CHUNKING |
| 2030 | && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK) |
| 2031 | sx->peer_offered &= ~PEER_OFFERED_CHUNKING; |
| 2032 | |
| 2033 | if (sx->peer_offered & PEER_OFFERED_CHUNKING) |
| 2034 | {DEBUG(D_transport) debug_printf("CHUNKING usable\n");} |
| 2035 | |
| 2036 | #ifndef DISABLE_PRDR |
| 2037 | if ( sx->peer_offered & PEER_OFFERED_PRDR |
| 2038 | && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK) |
| 2039 | sx->peer_offered &= ~PEER_OFFERED_PRDR; |
| 2040 | |
| 2041 | if (sx->peer_offered & PEER_OFFERED_PRDR) |
| 2042 | {DEBUG(D_transport) debug_printf("PRDR usable\n");} |
| 2043 | #endif |
| 2044 | |
| 2045 | /* Note if the server supports DSN */ |
| 2046 | smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN; |
| 2047 | DEBUG(D_transport) debug_printf("%susing DSN\n", |
| 2048 | sx->peer_offered & PEER_OFFERED_DSN ? "" : "not "); |
| 2049 | |
| 2050 | /* Note if the response to EHLO specifies support for the AUTH extension. |
| 2051 | If it has, check that this host is one we want to authenticate to, and do |
| 2052 | the business. The host name and address must be available when the |
| 2053 | authenticator's client driver is running. */ |
| 2054 | |
| 2055 | switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host, |
| 2056 | sx->ob, sx->esmtp, &sx->inblock, &sx->outblock)) |
| 2057 | { |
| 2058 | default: goto SEND_QUIT; |
| 2059 | case OK: break; |
| 2060 | case FAIL_SEND: goto SEND_FAILED; |
| 2061 | case FAIL: goto RESPONSE_FAILED; |
| 2062 | } |
| 2063 | } |
| 2064 | } |
| 2065 | pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE); |
| 2066 | |
| 2067 | /* The setting up of the SMTP call is now complete. Any subsequent errors are |
| 2068 | message-specific. */ |
| 2069 | |
| 2070 | sx->setting_up = FALSE; |
| 2071 | |
| 2072 | #ifdef SUPPORT_I18N |
| 2073 | if (sx->addrlist->prop.utf8_msg) |
| 2074 | { |
| 2075 | sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt |
| 2076 | && !sx->addrlist->prop.utf8_downcvt_maybe; |
| 2077 | DEBUG(D_transport) if (!sx->utf8_needed) |
| 2078 | debug_printf("utf8: %s downconvert\n", |
| 2079 | sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional"); |
| 2080 | } |
| 2081 | |
| 2082 | /* If this is an international message we need the host to speak SMTPUTF8 */ |
| 2083 | if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8)) |
| 2084 | { |
| 2085 | errno = ERRNO_UTF8_FWD; |
| 2086 | goto RESPONSE_FAILED; |
| 2087 | } |
| 2088 | #endif |
| 2089 | |
| 2090 | return OK; |
| 2091 | |
| 2092 | |
| 2093 | { |
| 2094 | int code; |
| 2095 | |
| 2096 | RESPONSE_FAILED: |
| 2097 | message = NULL; |
| 2098 | sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno, |
| 2099 | sx->buffer, &code, &message, &pass_message); |
| 2100 | goto FAILED; |
| 2101 | |
| 2102 | SEND_FAILED: |
| 2103 | code = '4'; |
| 2104 | message = US string_sprintf("send() to %s [%s] failed: %s", |
| 2105 | sx->host->name, sx->host->address, strerror(errno)); |
| 2106 | sx->send_quit = FALSE; |
| 2107 | goto FAILED; |
| 2108 | |
| 2109 | /* This label is jumped to directly when a TLS negotiation has failed, |
| 2110 | or was not done for a host for which it is required. Values will be set |
| 2111 | in message and errno, and setting_up will always be true. Treat as |
| 2112 | a temporary error. */ |
| 2113 | |
| 2114 | EHLOHELO_FAILED: |
| 2115 | code = '4'; |
| 2116 | message = string_sprintf("Remote host closed connection in response to %s" |
| 2117 | " (EHLO response was: %s)", smtp_command, sx->buffer); |
| 2118 | sx->send_quit = FALSE; |
| 2119 | goto FAILED; |
| 2120 | |
| 2121 | #ifdef SUPPORT_TLS |
| 2122 | TLS_FAILED: |
| 2123 | code = '4'; |
| 2124 | goto FAILED; |
| 2125 | #endif |
| 2126 | |
| 2127 | /* The failure happened while setting up the call; see if the failure was |
| 2128 | a 5xx response (this will either be on connection, or following HELO - a 5xx |
| 2129 | after EHLO causes it to try HELO). If so, fail all addresses, as this host is |
| 2130 | never going to accept them. For other errors during setting up (timeouts or |
| 2131 | whatever), defer all addresses, and yield DEFER, so that the host is not |
| 2132 | tried again for a while. */ |
| 2133 | |
| 2134 | FAILED: |
| 2135 | sx->ok = FALSE; /* For when reached by GOTO */ |
| 2136 | |
| 2137 | yield = code == '5' |
| 2138 | #ifdef SUPPORT_I18N |
| 2139 | || errno == ERRNO_UTF8_FWD |
| 2140 | #endif |
| 2141 | ? FAIL : DEFER; |
| 2142 | |
| 2143 | set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host |
| 2144 | #ifdef EXPERIMENTAL_DSN_INFO |
| 2145 | , sx->smtp_greeting, sx->helo_response |
| 2146 | #endif |
| 2147 | ); |
| 2148 | } |
| 2149 | |
| 2150 | |
| 2151 | SEND_QUIT: |
| 2152 | |
| 2153 | if (sx->send_quit) |
| 2154 | (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n"); |
| 2155 | |
| 2156 | #ifdef SUPPORT_TLS |
| 2157 | tls_close(FALSE, TRUE); |
| 2158 | #endif |
| 2159 | |
| 2160 | /* Close the socket, and return the appropriate value, first setting |
| 2161 | works because the NULL setting is passed back to the calling process, and |
| 2162 | remote_max_parallel is forced to 1 when delivering over an existing connection, |
| 2163 | |
| 2164 | If all went well and continue_more is set, we shouldn't actually get here if |
| 2165 | there are further addresses, as the return above will be taken. However, |
| 2166 | writing RSET might have failed, or there may be other addresses whose hosts are |
| 2167 | specified in the transports, and therefore not visible at top level, in which |
| 2168 | case continue_more won't get set. */ |
| 2169 | |
| 2170 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
| 2171 | if (sx->send_quit) |
| 2172 | { |
| 2173 | shutdown(sx->outblock.sock, SHUT_WR); |
| 2174 | if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0) |
| 2175 | for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;) |
| 2176 | rc--; /* drain socket */ |
| 2177 | sx->send_quit = FALSE; |
| 2178 | } |
| 2179 | (void)close(sx->inblock.sock); |
| 2180 | sx->inblock.sock = sx->outblock.sock = -1; |
| 2181 | |
| 2182 | #ifndef DISABLE_EVENT |
| 2183 | (void) event_raise(sx->tblock->event_action, US"tcp:close", NULL); |
| 2184 | #endif |
| 2185 | |
| 2186 | continue_transport = NULL; |
| 2187 | continue_hostname = NULL; |
| 2188 | return yield; |
| 2189 | } |
| 2190 | |
| 2191 | |
| 2192 | |
| 2193 | |
| 2194 | /* Create the string of options that will be appended to the MAIL FROM: |
| 2195 | in the connection context buffer */ |
| 2196 | |
| 2197 | static int |
| 2198 | build_mailcmd_options(smtp_context * sx, address_item * addrlist) |
| 2199 | { |
| 2200 | uschar * p = sx->buffer; |
| 2201 | address_item * addr; |
| 2202 | int address_count; |
| 2203 | |
| 2204 | *p = 0; |
| 2205 | |
| 2206 | /* If we know the receiving MTA supports the SIZE qualification, |
| 2207 | send it, adding something to the message size to allow for imprecision |
| 2208 | and things that get added en route. Exim keeps the number of lines |
| 2209 | in a message, so we can give an accurate value for the original message, but we |
| 2210 | need some additional to handle added headers. (Double "." characters don't get |
| 2211 | included in the count.) */ |
| 2212 | |
| 2213 | if (sx->peer_offered & PEER_OFFERED_SIZE) |
| 2214 | { |
| 2215 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition); |
| 2216 | while (*p) p++; |
| 2217 | } |
| 2218 | |
| 2219 | #ifndef DISABLE_PRDR |
| 2220 | /* If it supports Per-Recipient Data Reponses, and we have omre than one recipient, |
| 2221 | request that */ |
| 2222 | |
| 2223 | sx->prdr_active = FALSE; |
| 2224 | if (sx->peer_offered & PEER_OFFERED_PRDR) |
| 2225 | for (addr = addrlist; addr; addr = addr->next) |
| 2226 | if (addr->transport_return == PENDING_DEFER) |
| 2227 | { |
| 2228 | for (addr = addr->next; addr; addr = addr->next) |
| 2229 | if (addr->transport_return == PENDING_DEFER) |
| 2230 | { /* at least two recipients to send */ |
| 2231 | sx->prdr_active = TRUE; |
| 2232 | sprintf(CS p, " PRDR"); p += 5; |
| 2233 | break; |
| 2234 | } |
| 2235 | break; |
| 2236 | } |
| 2237 | #endif |
| 2238 | |
| 2239 | #ifdef SUPPORT_I18N |
| 2240 | /* If it supports internationalised messages, and this meesage need that, |
| 2241 | request it */ |
| 2242 | |
| 2243 | if ( sx->peer_offered & PEER_OFFERED_UTF8 |
| 2244 | && addrlist->prop.utf8_msg |
| 2245 | && !addrlist->prop.utf8_downcvt |
| 2246 | ) |
| 2247 | Ustrcpy(p, " SMTPUTF8"), p += 9; |
| 2248 | #endif |
| 2249 | |
| 2250 | /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */ |
| 2251 | for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0; |
| 2252 | addr && address_count < sx->max_rcpt; |
| 2253 | addr = addr->next) if (addr->transport_return == PENDING_DEFER) |
| 2254 | { |
| 2255 | address_count++; |
| 2256 | if (!(addr->dsn_flags & rf_dsnlasthop)) |
| 2257 | { |
| 2258 | sx->dsn_all_lasthop = FALSE; |
| 2259 | break; |
| 2260 | } |
| 2261 | } |
| 2262 | |
| 2263 | /* Add any DSN flags to the mail command */ |
| 2264 | |
| 2265 | if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop) |
| 2266 | { |
| 2267 | if (dsn_ret == dsn_ret_hdrs) |
| 2268 | { Ustrcpy(p, " RET=HDRS"); p += 9; } |
| 2269 | else if (dsn_ret == dsn_ret_full) |
| 2270 | { Ustrcpy(p, " RET=FULL"); p += 9; } |
| 2271 | |
| 2272 | if (dsn_envid) |
| 2273 | { |
| 2274 | string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid); |
| 2275 | while (*p) p++; |
| 2276 | } |
| 2277 | } |
| 2278 | |
| 2279 | /* If an authenticated_sender override has been specified for this transport |
| 2280 | instance, expand it. If the expansion is forced to fail, and there was already |
| 2281 | an authenticated_sender for this message, the original value will be used. |
| 2282 | Other expansion failures are serious. An empty result is ignored, but there is |
| 2283 | otherwise no check - this feature is expected to be used with LMTP and other |
| 2284 | cases where non-standard addresses (e.g. without domains) might be required. */ |
| 2285 | |
| 2286 | if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob)) |
| 2287 | return ERROR; |
| 2288 | |
| 2289 | return OK; |
| 2290 | } |
| 2291 | |
| 2292 | |
| 2293 | static void |
| 2294 | build_rcptcmd_options(smtp_context * sx, const address_item * addr) |
| 2295 | { |
| 2296 | uschar * p = sx->buffer; |
| 2297 | *p = 0; |
| 2298 | |
| 2299 | /* Add any DSN flags to the rcpt command */ |
| 2300 | |
| 2301 | if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop)) |
| 2302 | { |
| 2303 | if (addr->dsn_flags & rf_dsnflags) |
| 2304 | { |
| 2305 | int i; |
| 2306 | BOOL first = TRUE; |
| 2307 | |
| 2308 | Ustrcpy(p, " NOTIFY="); |
| 2309 | while (*p) p++; |
| 2310 | for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i]) |
| 2311 | { |
| 2312 | if (!first) *p++ = ','; |
| 2313 | first = FALSE; |
| 2314 | Ustrcpy(p, rf_names[i]); |
| 2315 | while (*p) p++; |
| 2316 | } |
| 2317 | } |
| 2318 | |
| 2319 | if (addr->dsn_orcpt) |
| 2320 | { |
| 2321 | string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s", |
| 2322 | addr->dsn_orcpt); |
| 2323 | while (*p) p++; |
| 2324 | } |
| 2325 | } |
| 2326 | } |
| 2327 | |
| 2328 | |
| 2329 | |
| 2330 | /* |
| 2331 | Return: |
| 2332 | 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL) |
| 2333 | -1 MAIL response error |
| 2334 | -2 any non-MAIL read i/o error |
| 2335 | -3 non-MAIL response timeout |
| 2336 | -4 internal error; channel still usable |
| 2337 | -5 transmit failed |
| 2338 | */ |
| 2339 | |
| 2340 | int |
| 2341 | smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield) |
| 2342 | { |
| 2343 | address_item * addr; |
| 2344 | int address_count; |
| 2345 | int rc; |
| 2346 | |
| 2347 | if (build_mailcmd_options(sx, sx->first_addr) != OK) |
| 2348 | { |
| 2349 | *yield = ERROR; |
| 2350 | return -4; |
| 2351 | } |
| 2352 | |
| 2353 | /* From here until we send the DATA command, we can make use of PIPELINING |
| 2354 | if the server host supports it. The code has to be able to check the responses |
| 2355 | at any point, for when the buffer fills up, so we write it totally generally. |
| 2356 | When PIPELINING is off, each command written reports that it has flushed the |
| 2357 | buffer. */ |
| 2358 | |
| 2359 | sx->pending_MAIL = TRUE; /* The block starts with MAIL */ |
| 2360 | |
| 2361 | { |
| 2362 | uschar * s = sx->from_addr; |
| 2363 | #ifdef SUPPORT_I18N |
| 2364 | uschar * errstr = NULL; |
| 2365 | |
| 2366 | /* If we must downconvert, do the from-address here. Remember we had to |
| 2367 | for the to-addresses (done below), and also (ugly) for re-doing when building |
| 2368 | the delivery log line. */ |
| 2369 | |
| 2370 | if ( sx->addrlist->prop.utf8_msg |
| 2371 | && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8)) |
| 2372 | ) |
| 2373 | { |
| 2374 | if (s = string_address_utf8_to_alabel(s, &errstr), errstr) |
| 2375 | { |
| 2376 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE); |
| 2377 | *yield = ERROR; |
| 2378 | return -4; |
| 2379 | } |
| 2380 | setflag(sx->addrlist, af_utf8_downcvt); |
| 2381 | } |
| 2382 | #endif |
| 2383 | |
| 2384 | rc = smtp_write_command(&sx->outblock, pipelining_active, |
| 2385 | "MAIL FROM:<%s>%s\r\n", s, sx->buffer); |
| 2386 | } |
| 2387 | |
| 2388 | mail_command = string_copy(big_buffer); /* Save for later error message */ |
| 2389 | |
| 2390 | switch(rc) |
| 2391 | { |
| 2392 | case -1: /* Transmission error */ |
| 2393 | return -5; |
| 2394 | |
| 2395 | case +1: /* Cmd was sent */ |
| 2396 | if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2', |
| 2397 | sx->ob->command_timeout)) |
| 2398 | { |
| 2399 | if (errno == 0 && sx->buffer[0] == '4') |
| 2400 | { |
| 2401 | errno = ERRNO_MAIL4XX; |
| 2402 | sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 2403 | } |
| 2404 | return -1; |
| 2405 | } |
| 2406 | sx->pending_MAIL = FALSE; |
| 2407 | break; |
| 2408 | |
| 2409 | /* otherwise zero: command queued for pipeline */ |
| 2410 | } |
| 2411 | |
| 2412 | /* Pass over all the relevant recipient addresses for this host, which are the |
| 2413 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send |
| 2414 | several before we have to read the responses for those seen so far. This |
| 2415 | checking is done by a subroutine because it also needs to be done at the end. |
| 2416 | Send only up to max_rcpt addresses at a time, leaving next_addr pointing to |
| 2417 | the next one if not all are sent. |
| 2418 | |
| 2419 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the |
| 2420 | last address because we want to abort if any recipients have any kind of |
| 2421 | problem, temporary or permanent. We know that all recipient addresses will have |
| 2422 | the PENDING_DEFER status, because only one attempt is ever made, and we know |
| 2423 | that max_rcpt will be large, so all addresses will be done at once. |
| 2424 | |
| 2425 | For verify we flush the pipeline after any (the only) rcpt address. */ |
| 2426 | |
| 2427 | for (addr = sx->first_addr, address_count = 0; |
| 2428 | addr && address_count < sx->max_rcpt; |
| 2429 | addr = addr->next) if (addr->transport_return == PENDING_DEFER) |
| 2430 | { |
| 2431 | int count; |
| 2432 | BOOL no_flush; |
| 2433 | uschar * rcpt_addr; |
| 2434 | |
| 2435 | addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN |
| 2436 | ? dsn_support_yes : dsn_support_no; |
| 2437 | |
| 2438 | address_count++; |
| 2439 | no_flush = pipelining_active && !sx->verify && (!mua_wrapper || addr->next); |
| 2440 | |
| 2441 | build_rcptcmd_options(sx, addr); |
| 2442 | |
| 2443 | /* Now send the RCPT command, and process outstanding responses when |
| 2444 | necessary. After a timeout on RCPT, we just end the function, leaving the |
| 2445 | yield as OK, because this error can often mean that there is a problem with |
| 2446 | just one address, so we don't want to delay the host. */ |
| 2447 | |
| 2448 | rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes); |
| 2449 | |
| 2450 | #ifdef SUPPORT_I18N |
| 2451 | if ( testflag(sx->addrlist, af_utf8_downcvt) |
| 2452 | && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL)) |
| 2453 | ) |
| 2454 | { |
| 2455 | /*XXX could we use a per-address errstr here? Not fail the whole send? */ |
| 2456 | errno = ERRNO_EXPANDFAIL; |
| 2457 | return -5; /*XXX too harsh? */ |
| 2458 | } |
| 2459 | #endif |
| 2460 | |
| 2461 | count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n", |
| 2462 | rcpt_addr, sx->igquotstr, sx->buffer); |
| 2463 | |
| 2464 | if (count < 0) return -5; |
| 2465 | if (count > 0) |
| 2466 | { |
| 2467 | switch(sync_responses(sx, count, 0)) |
| 2468 | { |
| 2469 | case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 2470 | case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */ |
| 2471 | break; |
| 2472 | |
| 2473 | case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 2474 | if (!sx->lmtp) /* can't tell about progress yet */ |
| 2475 | sx->completed_addr = TRUE; |
| 2476 | case 0: /* No 2xx or 5xx, but no probs */ |
| 2477 | break; |
| 2478 | |
| 2479 | case -1: return -3; /* Timeout on RCPT */ |
| 2480 | case -2: return -2; /* non-MAIL read i/o error */ |
| 2481 | default: return -1; /* any MAIL error */ |
| 2482 | } |
| 2483 | sx->pending_MAIL = FALSE; /* Dealt with MAIL */ |
| 2484 | } |
| 2485 | } /* Loop for next address */ |
| 2486 | |
| 2487 | sx->next_addr = addr; |
| 2488 | return 0; |
| 2489 | } |
| 2490 | |
| 2491 | |
| 2492 | /************************************************* |
| 2493 | * Deliver address list to given host * |
| 2494 | *************************************************/ |
| 2495 | |
| 2496 | /* If continue_hostname is not null, we get here only when continuing to |
| 2497 | deliver down an existing channel. The channel was passed as the standard |
| 2498 | input. TLS is never active on a passed channel; the previous process always |
| 2499 | closes it down before passing the connection on. |
| 2500 | |
| 2501 | Otherwise, we have to make a connection to the remote host, and do the |
| 2502 | initial protocol exchange. |
| 2503 | |
| 2504 | When running as an MUA wrapper, if the sender or any recipient is rejected, |
| 2505 | temporarily or permanently, we force failure for all recipients. |
| 2506 | |
| 2507 | Arguments: |
| 2508 | addrlist chain of potential addresses to deliver; only those whose |
| 2509 | transport_return field is set to PENDING_DEFER are currently |
| 2510 | being processed; others should be skipped - they have either |
| 2511 | been delivered to an earlier host or IP address, or been |
| 2512 | failed by one of them. |
| 2513 | host host to deliver to |
| 2514 | host_af AF_INET or AF_INET6 |
| 2515 | port default TCP/IP port to use, in host byte order |
| 2516 | interface interface to bind to, or NULL |
| 2517 | tblock transport instance block |
| 2518 | message_defer set TRUE if yield is OK, but all addresses were deferred |
| 2519 | because of a non-recipient, non-host failure, that is, a |
| 2520 | 4xx response to MAIL FROM, DATA, or ".". This is a defer |
| 2521 | that is specific to the message. |
| 2522 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for |
| 2523 | a second attempt after TLS initialization fails |
| 2524 | |
| 2525 | Returns: OK - the connection was made and the delivery attempted; |
| 2526 | the result for each address is in its data block. |
| 2527 | DEFER - the connection could not be made, or something failed |
| 2528 | while setting up the SMTP session, or there was a |
| 2529 | non-message-specific error, such as a timeout. |
| 2530 | ERROR - a filter command is specified for this transport, |
| 2531 | and there was a problem setting it up; OR helo_data |
| 2532 | or add_headers or authenticated_sender is specified |
| 2533 | for this transport, and the string failed to expand |
| 2534 | */ |
| 2535 | |
| 2536 | static int |
| 2537 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port, |
| 2538 | uschar *interface, transport_instance *tblock, |
| 2539 | BOOL *message_defer, BOOL suppress_tls) |
| 2540 | { |
| 2541 | address_item *addr; |
| 2542 | int yield = OK; |
| 2543 | int save_errno; |
| 2544 | int rc; |
| 2545 | time_t start_delivery_time = time(NULL); |
| 2546 | |
| 2547 | BOOL pass_message = FALSE; |
| 2548 | uschar *message = NULL; |
| 2549 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; |
| 2550 | uschar *p; |
| 2551 | |
| 2552 | smtp_context sx; |
| 2553 | |
| 2554 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ |
| 2555 | *message_defer = FALSE; |
| 2556 | |
| 2557 | sx.addrlist = addrlist; |
| 2558 | sx.host = host; |
| 2559 | sx.host_af = host_af, |
| 2560 | sx.port = port; |
| 2561 | sx.interface = interface; |
| 2562 | sx.helo_data = NULL; |
| 2563 | sx.tblock = tblock; |
| 2564 | sx.verify = FALSE; |
| 2565 | |
| 2566 | /* Get the channel set up ready for a message (MAIL FROM being the next |
| 2567 | SMTP command to send */ |
| 2568 | |
| 2569 | if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK) |
| 2570 | return rc; |
| 2571 | |
| 2572 | /* If there is a filter command specified for this transport, we can now |
| 2573 | set it up. This cannot be done until the identify of the host is known. */ |
| 2574 | |
| 2575 | if (tblock->filter_command) |
| 2576 | { |
| 2577 | BOOL rc; |
| 2578 | uschar fbuf[64]; |
| 2579 | sprintf(CS fbuf, "%.50s transport", tblock->name); |
| 2580 | rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command, |
| 2581 | TRUE, DEFER, addrlist, fbuf, NULL); |
| 2582 | transport_filter_timeout = tblock->filter_timeout; |
| 2583 | |
| 2584 | /* On failure, copy the error to all addresses, abandon the SMTP call, and |
| 2585 | yield ERROR. */ |
| 2586 | |
| 2587 | if (!rc) |
| 2588 | { |
| 2589 | set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER, |
| 2590 | FALSE); |
| 2591 | yield = ERROR; |
| 2592 | goto SEND_QUIT; |
| 2593 | } |
| 2594 | |
| 2595 | if ( transport_filter_argv |
| 2596 | && *transport_filter_argv |
| 2597 | && **transport_filter_argv |
| 2598 | && sx.peer_offered & PEER_OFFERED_CHUNKING |
| 2599 | ) |
| 2600 | { |
| 2601 | sx.peer_offered &= ~PEER_OFFERED_CHUNKING; |
| 2602 | DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n"); |
| 2603 | } |
| 2604 | } |
| 2605 | |
| 2606 | |
| 2607 | /* For messages that have more than the maximum number of envelope recipients, |
| 2608 | we want to send several transactions down the same SMTP connection. (See |
| 2609 | comments in deliver.c as to how this reconciles, heuristically, with |
| 2610 | remote_max_parallel.) This optimization was added to Exim after the following |
| 2611 | code was already working. The simplest way to put it in without disturbing the |
| 2612 | code was to use a goto to jump back to this point when there is another |
| 2613 | transaction to handle. */ |
| 2614 | |
| 2615 | SEND_MESSAGE: |
| 2616 | sx.from_addr = return_path; |
| 2617 | sx.first_addr = sx.sync_addr = addrlist; |
| 2618 | sx.ok = FALSE; |
| 2619 | sx.send_rset = TRUE; |
| 2620 | sx.completed_addr = FALSE; |
| 2621 | |
| 2622 | |
| 2623 | /* Initiate a message transfer. */ |
| 2624 | |
| 2625 | switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield)) |
| 2626 | { |
| 2627 | case 0: break; |
| 2628 | case -1: case -2: goto RESPONSE_FAILED; |
| 2629 | case -3: goto END_OFF; |
| 2630 | case -4: goto SEND_QUIT; |
| 2631 | default: goto SEND_FAILED; |
| 2632 | } |
| 2633 | |
| 2634 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either |
| 2635 | permanently or temporarily. We should have flushed and synced after the last |
| 2636 | RCPT. */ |
| 2637 | |
| 2638 | if (mua_wrapper) |
| 2639 | { |
| 2640 | address_item *badaddr; |
| 2641 | for (badaddr = sx.first_addr; badaddr; badaddr = badaddr->next) |
| 2642 | if (badaddr->transport_return != PENDING_OK) |
| 2643 | { |
| 2644 | /*XXX could we find a better errno than 0 here? */ |
| 2645 | set_errno_nohost(addrlist, 0, badaddr->message, FAIL, |
| 2646 | testflag(badaddr, af_pass_message)); |
| 2647 | sx.ok = FALSE; |
| 2648 | break; |
| 2649 | } |
| 2650 | } |
| 2651 | |
| 2652 | /* If ok is TRUE, we know we have got at least one good recipient, and must now |
| 2653 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still |
| 2654 | have a good recipient buffered up if we are pipelining. We don't want to waste |
| 2655 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we |
| 2656 | are pipelining. The responses are all handled by sync_responses(). |
| 2657 | If using CHUNKING, do not send a BDAT until we know how big a chunk we want |
| 2658 | to send is. */ |
| 2659 | |
| 2660 | if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING) |
| 2661 | && (sx.ok || (pipelining_active && !mua_wrapper))) |
| 2662 | { |
| 2663 | int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n"); |
| 2664 | |
| 2665 | if (count < 0) goto SEND_FAILED; |
| 2666 | switch(sync_responses(&sx, count, sx.ok ? +1 : -1)) |
| 2667 | { |
| 2668 | case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 2669 | case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */ |
| 2670 | break; |
| 2671 | |
| 2672 | case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 2673 | if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */ |
| 2674 | case 0: break; /* No 2xx or 5xx, but no probs */ |
| 2675 | |
| 2676 | case -1: goto END_OFF; /* Timeout on RCPT */ |
| 2677 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ |
| 2678 | } |
| 2679 | pipelining_active = FALSE; |
| 2680 | data_command = string_copy(big_buffer); /* Save for later error message */ |
| 2681 | } |
| 2682 | |
| 2683 | /* If there were no good recipients (but otherwise there have been no |
| 2684 | problems), just set ok TRUE, since we have handled address-specific errors |
| 2685 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism |
| 2686 | for handling the SMTP dot-handling protocol, flagging to apply to headers as |
| 2687 | well as body. Set the appropriate timeout value to be used for each chunk. |
| 2688 | (Haven't been able to make it work using select() for writing yet.) */ |
| 2689 | |
| 2690 | if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok) |
| 2691 | { |
| 2692 | /* Save the first address of the next batch. */ |
| 2693 | sx.first_addr = sx.next_addr; |
| 2694 | |
| 2695 | sx.ok = TRUE; |
| 2696 | } |
| 2697 | else |
| 2698 | { |
| 2699 | transport_ctx tctx = { |
| 2700 | tblock, |
| 2701 | addrlist, |
| 2702 | US".", US"..", /* Escaping strings */ |
| 2703 | topt_use_crlf | topt_escape_headers |
| 2704 | | (tblock->body_only ? topt_no_headers : 0) |
| 2705 | | (tblock->headers_only ? topt_no_body : 0) |
| 2706 | | (tblock->return_path_add ? topt_add_return_path : 0) |
| 2707 | | (tblock->delivery_date_add ? topt_add_delivery_date : 0) |
| 2708 | | (tblock->envelope_to_add ? topt_add_envelope_to : 0) |
| 2709 | }; |
| 2710 | |
| 2711 | /* If using CHUNKING we need a callback from the generic transport |
| 2712 | support to us, for the sending of BDAT smtp commands and the reaping |
| 2713 | of responses. The callback needs a whole bunch of state so set up |
| 2714 | a transport-context structure to be passed around. */ |
| 2715 | |
| 2716 | if (sx.peer_offered & PEER_OFFERED_CHUNKING) |
| 2717 | { |
| 2718 | tctx.check_string = tctx.escape_string = NULL; |
| 2719 | tctx.options |= topt_use_bdat; |
| 2720 | tctx.chunk_cb = smtp_chunk_cmd_callback; |
| 2721 | sx.pending_BDAT = FALSE; |
| 2722 | sx.good_RCPT = sx.ok; |
| 2723 | sx.cmd_count = 0; |
| 2724 | tctx.smtp_context = &sx; |
| 2725 | } |
| 2726 | else |
| 2727 | tctx.options |= topt_end_dot; |
| 2728 | |
| 2729 | /* Save the first address of the next batch. */ |
| 2730 | sx.first_addr = sx.next_addr; |
| 2731 | |
| 2732 | /* Responses from CHUNKING commands go in buffer. Otherwise, |
| 2733 | there has not been a response. */ |
| 2734 | |
| 2735 | sx.buffer[0] = 0; |
| 2736 | |
| 2737 | sigalrm_seen = FALSE; |
| 2738 | transport_write_timeout = sx.ob->data_timeout; |
| 2739 | smtp_command = US"sending data block"; /* For error messages */ |
| 2740 | DEBUG(D_transport|D_v) |
| 2741 | if (sx.peer_offered & PEER_OFFERED_CHUNKING) |
| 2742 | debug_printf(" will write message using CHUNKING\n"); |
| 2743 | else |
| 2744 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); |
| 2745 | transport_count = 0; |
| 2746 | |
| 2747 | #ifndef DISABLE_DKIM |
| 2748 | sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim); |
| 2749 | #else |
| 2750 | sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0); |
| 2751 | #endif |
| 2752 | |
| 2753 | /* transport_write_message() uses write() because it is called from other |
| 2754 | places to write to non-sockets. This means that under some OS (e.g. Solaris) |
| 2755 | it can exit with "Broken pipe" as its error. This really means that the |
| 2756 | socket got closed at the far end. */ |
| 2757 | |
| 2758 | transport_write_timeout = 0; /* for subsequent transports */ |
| 2759 | |
| 2760 | /* Failure can either be some kind of I/O disaster (including timeout), |
| 2761 | or the failure of a transport filter or the expansion of added headers. |
| 2762 | Or, when CHUNKING, it can be a protocol-detected failure. */ |
| 2763 | |
| 2764 | if (!sx.ok) |
| 2765 | goto RESPONSE_FAILED; |
| 2766 | |
| 2767 | /* We used to send the terminating "." explicitly here, but because of |
| 2768 | buffering effects at both ends of TCP/IP connections, you don't gain |
| 2769 | anything by keeping it separate, so it might as well go in the final |
| 2770 | data buffer for efficiency. This is now done by setting the topt_end_dot |
| 2771 | flag above. */ |
| 2772 | |
| 2773 | smtp_command = US"end of data"; |
| 2774 | |
| 2775 | if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1) |
| 2776 | { |
| 2777 | /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */ |
| 2778 | switch(sync_responses(&sx, sx.cmd_count-1, 0)) |
| 2779 | { |
| 2780 | case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 2781 | case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */ |
| 2782 | break; |
| 2783 | |
| 2784 | case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 2785 | if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */ |
| 2786 | case 0: break; /* No 2xx or 5xx, but no probs */ |
| 2787 | |
| 2788 | case -1: goto END_OFF; /* Timeout on RCPT */ |
| 2789 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ |
| 2790 | } |
| 2791 | } |
| 2792 | |
| 2793 | #ifndef DISABLE_PRDR |
| 2794 | /* For PRDR we optionally get a partial-responses warning |
| 2795 | * followed by the individual responses, before going on with |
| 2796 | * the overall response. If we don't get the warning then deal |
| 2797 | * with per non-PRDR. */ |
| 2798 | if(sx.prdr_active) |
| 2799 | { |
| 2800 | sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3', |
| 2801 | sx.ob->final_timeout); |
| 2802 | if (!sx.ok && errno == 0) switch(sx.buffer[0]) |
| 2803 | { |
| 2804 | case '2': sx.prdr_active = FALSE; |
| 2805 | sx.ok = TRUE; |
| 2806 | break; |
| 2807 | case '4': errno = ERRNO_DATA4XX; |
| 2808 | addrlist->more_errno |= |
| 2809 | ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8; |
| 2810 | break; |
| 2811 | } |
| 2812 | } |
| 2813 | else |
| 2814 | #endif |
| 2815 | |
| 2816 | /* For non-PRDR SMTP, we now read a single response that applies to the |
| 2817 | whole message. If it is OK, then all the addresses have been delivered. */ |
| 2818 | |
| 2819 | if (!sx.lmtp) |
| 2820 | { |
| 2821 | sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2', |
| 2822 | sx.ob->final_timeout); |
| 2823 | if (!sx.ok && errno == 0 && sx.buffer[0] == '4') |
| 2824 | { |
| 2825 | errno = ERRNO_DATA4XX; |
| 2826 | addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8; |
| 2827 | } |
| 2828 | } |
| 2829 | |
| 2830 | /* For LMTP, we get back a response for every RCPT command that we sent; |
| 2831 | some may be accepted and some rejected. For those that get a response, their |
| 2832 | status is fixed; any that are accepted have been handed over, even if later |
| 2833 | responses crash - at least, that's how I read RFC 2033. |
| 2834 | |
| 2835 | If all went well, mark the recipient addresses as completed, record which |
| 2836 | host/IPaddress they were delivered to, and cut out RSET when sending another |
| 2837 | message down the same channel. Write the completed addresses to the journal |
| 2838 | now so that they are recorded in case there is a crash of hardware or |
| 2839 | software before the spool gets updated. Also record the final SMTP |
| 2840 | confirmation if needed (for SMTP only). */ |
| 2841 | |
| 2842 | if (sx.ok) |
| 2843 | { |
| 2844 | int flag = '='; |
| 2845 | int delivery_time = (int)(time(NULL) - start_delivery_time); |
| 2846 | int len; |
| 2847 | uschar *conf = NULL; |
| 2848 | |
| 2849 | sx.send_rset = FALSE; |
| 2850 | pipelining_active = FALSE; |
| 2851 | |
| 2852 | /* Set up confirmation if needed - applies only to SMTP */ |
| 2853 | |
| 2854 | if ( |
| 2855 | #ifdef DISABLE_EVENT |
| 2856 | LOGGING(smtp_confirmation) && |
| 2857 | #endif |
| 2858 | !sx.lmtp |
| 2859 | ) |
| 2860 | { |
| 2861 | const uschar *s = string_printing(sx.buffer); |
| 2862 | /* deconst cast ok here as string_printing was checked to have alloc'n'copied */ |
| 2863 | conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s; |
| 2864 | } |
| 2865 | |
| 2866 | /* Process all transported addresses - for LMTP or PRDR, read a status for |
| 2867 | each one. */ |
| 2868 | |
| 2869 | for (addr = addrlist; addr != sx.first_addr; addr = addr->next) |
| 2870 | { |
| 2871 | if (addr->transport_return != PENDING_OK) continue; |
| 2872 | |
| 2873 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the |
| 2874 | remaining addresses. Otherwise, it's a return code for just the one |
| 2875 | address. For temporary errors, add a retry item for the address so that |
| 2876 | it doesn't get tried again too soon. */ |
| 2877 | |
| 2878 | #ifndef DISABLE_PRDR |
| 2879 | if (sx.lmtp || sx.prdr_active) |
| 2880 | #else |
| 2881 | if (sx.lmtp) |
| 2882 | #endif |
| 2883 | { |
| 2884 | if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2', |
| 2885 | sx.ob->final_timeout)) |
| 2886 | { |
| 2887 | if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED; |
| 2888 | addr->message = string_sprintf( |
| 2889 | #ifndef DISABLE_PRDR |
| 2890 | "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP", |
| 2891 | #else |
| 2892 | "LMTP error after %s: %s", |
| 2893 | #endif |
| 2894 | data_command, string_printing(sx.buffer)); |
| 2895 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
| 2896 | if (sx.buffer[0] == '5') |
| 2897 | addr->transport_return = FAIL; |
| 2898 | else |
| 2899 | { |
| 2900 | errno = ERRNO_DATA4XX; |
| 2901 | addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8; |
| 2902 | addr->transport_return = DEFER; |
| 2903 | #ifndef DISABLE_PRDR |
| 2904 | if (!sx.prdr_active) |
| 2905 | #endif |
| 2906 | retry_add_item(addr, addr->address_retry_key, 0); |
| 2907 | } |
| 2908 | continue; |
| 2909 | } |
| 2910 | sx.completed_addr = TRUE; /* NOW we can set this flag */ |
| 2911 | if (LOGGING(smtp_confirmation)) |
| 2912 | { |
| 2913 | const uschar *s = string_printing(sx.buffer); |
| 2914 | /* deconst cast ok here as string_printing was checked to have alloc'n'copied */ |
| 2915 | conf = (s == sx.buffer) ? US string_copy(s) : US s; |
| 2916 | } |
| 2917 | } |
| 2918 | |
| 2919 | /* SMTP, or success return from LMTP for this address. Pass back the |
| 2920 | actual host that was used. */ |
| 2921 | |
| 2922 | addr->transport_return = OK; |
| 2923 | addr->more_errno = delivery_time; |
| 2924 | addr->host_used = host; |
| 2925 | addr->special_action = flag; |
| 2926 | addr->message = conf; |
| 2927 | #ifndef DISABLE_PRDR |
| 2928 | if (sx.prdr_active) addr->flags |= af_prdr_used; |
| 2929 | #endif |
| 2930 | if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used; |
| 2931 | flag = '-'; |
| 2932 | |
| 2933 | #ifndef DISABLE_PRDR |
| 2934 | if (!sx.prdr_active) |
| 2935 | #endif |
| 2936 | { |
| 2937 | /* Update the journal. For homonymic addresses, use the base address plus |
| 2938 | the transport name. See lots of comments in deliver.c about the reasons |
| 2939 | for the complications when homonyms are involved. Just carry on after |
| 2940 | write error, as it may prove possible to update the spool file later. */ |
| 2941 | |
| 2942 | if (testflag(addr, af_homonym)) |
| 2943 | sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); |
| 2944 | else |
| 2945 | sprintf(CS sx.buffer, "%.500s\n", addr->unique); |
| 2946 | |
| 2947 | DEBUG(D_deliver) debug_printf("journalling %s\n", sx.buffer); |
| 2948 | len = Ustrlen(CS sx.buffer); |
| 2949 | if (write(journal_fd, sx.buffer, len) != len) |
| 2950 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " |
| 2951 | "%s: %s", sx.buffer, strerror(errno)); |
| 2952 | } |
| 2953 | } |
| 2954 | |
| 2955 | #ifndef DISABLE_PRDR |
| 2956 | if (sx.prdr_active) |
| 2957 | { |
| 2958 | /* PRDR - get the final, overall response. For any non-success |
| 2959 | upgrade all the address statuses. */ |
| 2960 | sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2', |
| 2961 | sx.ob->final_timeout); |
| 2962 | if (!sx.ok) |
| 2963 | { |
| 2964 | if(errno == 0 && sx.buffer[0] == '4') |
| 2965 | { |
| 2966 | errno = ERRNO_DATA4XX; |
| 2967 | addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8; |
| 2968 | } |
| 2969 | for (addr = addrlist; addr != sx.first_addr; addr = addr->next) |
| 2970 | if (sx.buffer[0] == '5' || addr->transport_return == OK) |
| 2971 | addr->transport_return = PENDING_OK; /* allow set_errno action */ |
| 2972 | goto RESPONSE_FAILED; |
| 2973 | } |
| 2974 | |
| 2975 | /* Update the journal, or setup retry. */ |
| 2976 | for (addr = addrlist; addr != sx.first_addr; addr = addr->next) |
| 2977 | if (addr->transport_return == OK) |
| 2978 | { |
| 2979 | if (testflag(addr, af_homonym)) |
| 2980 | sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); |
| 2981 | else |
| 2982 | sprintf(CS sx.buffer, "%.500s\n", addr->unique); |
| 2983 | |
| 2984 | DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer); |
| 2985 | len = Ustrlen(CS sx.buffer); |
| 2986 | if (write(journal_fd, sx.buffer, len) != len) |
| 2987 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " |
| 2988 | "%s: %s", sx.buffer, strerror(errno)); |
| 2989 | } |
| 2990 | else if (addr->transport_return == DEFER) |
| 2991 | retry_add_item(addr, addr->address_retry_key, -2); |
| 2992 | } |
| 2993 | #endif |
| 2994 | |
| 2995 | /* Ensure the journal file is pushed out to disk. */ |
| 2996 | |
| 2997 | if (EXIMfsync(journal_fd) < 0) |
| 2998 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", |
| 2999 | strerror(errno)); |
| 3000 | } |
| 3001 | } |
| 3002 | |
| 3003 | |
| 3004 | /* Handle general (not specific to one address) failures here. The value of ok |
| 3005 | is used to skip over this code on the falling through case. A timeout causes a |
| 3006 | deferral. Other errors may defer or fail according to the response code, and |
| 3007 | may set up a special errno value, e.g. after connection chopped, which is |
| 3008 | assumed if errno == 0 and there is no text in the buffer. If control reaches |
| 3009 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as |
| 3010 | the problem is not related to this specific message. */ |
| 3011 | |
| 3012 | if (!sx.ok) |
| 3013 | { |
| 3014 | int code, set_rc; |
| 3015 | uschar * set_message; |
| 3016 | |
| 3017 | RESPONSE_FAILED: |
| 3018 | { |
| 3019 | save_errno = errno; |
| 3020 | message = NULL; |
| 3021 | sx.send_quit = check_response(host, &save_errno, addrlist->more_errno, |
| 3022 | sx.buffer, &code, &message, &pass_message); |
| 3023 | goto FAILED; |
| 3024 | } |
| 3025 | |
| 3026 | SEND_FAILED: |
| 3027 | { |
| 3028 | save_errno = errno; |
| 3029 | code = '4'; |
| 3030 | message = US string_sprintf("send() to %s [%s] failed: %s", |
| 3031 | host->name, host->address, strerror(save_errno)); |
| 3032 | sx.send_quit = FALSE; |
| 3033 | goto FAILED; |
| 3034 | } |
| 3035 | |
| 3036 | FAILED: |
| 3037 | { |
| 3038 | BOOL message_error; |
| 3039 | |
| 3040 | sx.ok = FALSE; /* For when reached by GOTO */ |
| 3041 | set_message = message; |
| 3042 | |
| 3043 | /* We want to handle timeouts after MAIL or "." and loss of connection after |
| 3044 | "." specially. They can indicate a problem with the sender address or with |
| 3045 | the contents of the message rather than a real error on the connection. These |
| 3046 | cases are treated in the same way as a 4xx response. This next bit of code |
| 3047 | does the classification. */ |
| 3048 | |
| 3049 | switch(save_errno) |
| 3050 | { |
| 3051 | case 0: |
| 3052 | case ERRNO_MAIL4XX: |
| 3053 | case ERRNO_DATA4XX: |
| 3054 | message_error = TRUE; |
| 3055 | break; |
| 3056 | |
| 3057 | case ETIMEDOUT: |
| 3058 | message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 || |
| 3059 | Ustrncmp(smtp_command,"end ",4) == 0; |
| 3060 | break; |
| 3061 | |
| 3062 | case ERRNO_SMTPCLOSED: |
| 3063 | message_error = Ustrncmp(smtp_command,"end ",4) == 0; |
| 3064 | break; |
| 3065 | |
| 3066 | default: |
| 3067 | message_error = FALSE; |
| 3068 | break; |
| 3069 | } |
| 3070 | |
| 3071 | /* Handle the cases that are treated as message errors. These are: |
| 3072 | |
| 3073 | (a) negative response or timeout after MAIL |
| 3074 | (b) negative response after DATA |
| 3075 | (c) negative response or timeout or dropped connection after "." |
| 3076 | (d) utf8 support required and not offered |
| 3077 | |
| 3078 | It won't be a negative response or timeout after RCPT, as that is dealt |
| 3079 | with separately above. The action in all cases is to set an appropriate |
| 3080 | error code for all the addresses, but to leave yield set to OK because the |
| 3081 | host itself has not failed. Of course, it might in practice have failed |
| 3082 | when we've had a timeout, but if so, we'll discover that at the next |
| 3083 | delivery attempt. For a temporary error, set the message_defer flag, and |
| 3084 | write to the logs for information if this is not the last host. The error |
| 3085 | for the last host will be logged as part of the address's log line. */ |
| 3086 | |
| 3087 | if (message_error) |
| 3088 | { |
| 3089 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ |
| 3090 | |
| 3091 | /* If there's an errno, the message contains just the identity of |
| 3092 | the host. */ |
| 3093 | |
| 3094 | if (code == '5') |
| 3095 | set_rc = FAIL; |
| 3096 | else /* Anything other than 5 is treated as temporary */ |
| 3097 | { |
| 3098 | set_rc = DEFER; |
| 3099 | if (save_errno > 0) |
| 3100 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); |
| 3101 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message); |
| 3102 | msglog_line(host, message); |
| 3103 | *message_defer = TRUE; |
| 3104 | } |
| 3105 | } |
| 3106 | |
| 3107 | /* Otherwise, we have an I/O error or a timeout other than after MAIL or |
| 3108 | ".", or some other transportation error. We defer all addresses and yield |
| 3109 | DEFER, except for the case of failed add_headers expansion, or a transport |
| 3110 | filter failure, when the yield should be ERROR, to stop it trying other |
| 3111 | hosts. */ |
| 3112 | |
| 3113 | else |
| 3114 | { |
| 3115 | set_rc = DEFER; |
| 3116 | yield = (save_errno == ERRNO_CHHEADER_FAIL || |
| 3117 | save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER; |
| 3118 | } |
| 3119 | } |
| 3120 | |
| 3121 | set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host |
| 3122 | #ifdef EXPERIMENTAL_DSN_INFO |
| 3123 | , sx.smtp_greeting, sx.helo_response |
| 3124 | #endif |
| 3125 | ); |
| 3126 | } |
| 3127 | |
| 3128 | |
| 3129 | /* If all has gone well, send_quit will be set TRUE, implying we can end the |
| 3130 | SMTP session tidily. However, if there were too many addresses to send in one |
| 3131 | message (indicated by first_addr being non-NULL) we want to carry on with the |
| 3132 | rest of them. Also, it is desirable to send more than one message down the SMTP |
| 3133 | connection if there are several waiting, provided we haven't already sent so |
| 3134 | many as to hit the configured limit. The function transport_check_waiting looks |
| 3135 | for a waiting message and returns its id. Then transport_pass_socket tries to |
| 3136 | set up a continued delivery by passing the socket on to another process. The |
| 3137 | variable send_rset is FALSE if a message has just been successfully transfered. |
| 3138 | |
| 3139 | If we are already sending down a continued channel, there may be further |
| 3140 | addresses not yet delivered that are aimed at the same host, but which have not |
| 3141 | been passed in this run of the transport. In this case, continue_more will be |
| 3142 | true, and all we should do is send RSET if necessary, and return, leaving the |
| 3143 | channel open. |
| 3144 | |
| 3145 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we |
| 3146 | do not want to continue with other messages down the same channel, because that |
| 3147 | can lead to looping between two or more messages, all with the same, |
| 3148 | temporarily failing address(es). [The retry information isn't updated yet, so |
| 3149 | new processes keep on trying.] We probably also don't want to try more of this |
| 3150 | message's addresses either. |
| 3151 | |
| 3152 | If we have started a TLS session, we have to end it before passing the |
| 3153 | connection to a new process. However, not all servers can handle this (Exim |
| 3154 | can), so we do not pass such a connection on if the host matches |
| 3155 | hosts_nopass_tls. */ |
| 3156 | |
| 3157 | DEBUG(D_transport) |
| 3158 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " |
| 3159 | "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit, |
| 3160 | sx.send_rset, continue_more, yield, sx.first_addr ? "not " : ""); |
| 3161 | |
| 3162 | if (sx.completed_addr && sx.ok && sx.send_quit) |
| 3163 | { |
| 3164 | BOOL more; |
| 3165 | smtp_compare_t t_compare; |
| 3166 | |
| 3167 | t_compare.tblock = tblock; |
| 3168 | t_compare.current_sender_address = sender_address; |
| 3169 | |
| 3170 | if ( sx.first_addr != NULL |
| 3171 | || continue_more |
| 3172 | || ( ( tls_out.active < 0 |
| 3173 | || verify_check_given_host(&sx.ob->hosts_nopass_tls, host) != OK |
| 3174 | ) |
| 3175 | && |
| 3176 | transport_check_waiting(tblock->name, host->name, |
| 3177 | tblock->connection_max_messages, new_message_id, &more, |
| 3178 | (oicf)smtp_are_same_identities, (void*)&t_compare) |
| 3179 | ) ) |
| 3180 | { |
| 3181 | uschar *msg; |
| 3182 | BOOL pass_message; |
| 3183 | |
| 3184 | if (sx.send_rset) |
| 3185 | if (! (sx.ok = smtp_write_command(&sx.outblock, FALSE, "RSET\r\n") >= 0)) |
| 3186 | { |
| 3187 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, |
| 3188 | host->address, strerror(errno)); |
| 3189 | sx.send_quit = FALSE; |
| 3190 | } |
| 3191 | else if (! (sx.ok = smtp_read_response(&sx.inblock, sx.buffer, |
| 3192 | sizeof(sx.buffer), '2', sx.ob->command_timeout))) |
| 3193 | { |
| 3194 | int code; |
| 3195 | sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg, |
| 3196 | &pass_message); |
| 3197 | if (!sx.send_quit) |
| 3198 | { |
| 3199 | DEBUG(D_transport) debug_printf("H=%s [%s] %s\n", |
| 3200 | host->name, host->address, msg); |
| 3201 | } |
| 3202 | } |
| 3203 | |
| 3204 | /* Either RSET was not needed, or it succeeded */ |
| 3205 | |
| 3206 | if (sx.ok) |
| 3207 | { |
| 3208 | if (sx.first_addr != NULL) /* More addresses still to be sent */ |
| 3209 | { /* in this run of the transport */ |
| 3210 | continue_sequence++; /* Causes * in logging */ |
| 3211 | goto SEND_MESSAGE; |
| 3212 | } |
| 3213 | if (continue_more) return yield; /* More addresses for another run */ |
| 3214 | |
| 3215 | /* Pass the socket to a new Exim process. Before doing so, we must shut |
| 3216 | down TLS. Not all MTAs allow for the continuation of the SMTP session |
| 3217 | when TLS is shut down. We test for this by sending a new EHLO. If we |
| 3218 | don't get a good response, we don't attempt to pass the socket on. */ |
| 3219 | |
| 3220 | #ifdef SUPPORT_TLS |
| 3221 | if (tls_out.active >= 0) |
| 3222 | { |
| 3223 | tls_close(FALSE, TRUE); |
| 3224 | smtp_peer_options = smtp_peer_options_wrap; |
| 3225 | sx.ok = !sx.smtps |
| 3226 | && smtp_write_command(&sx.outblock, FALSE, |
| 3227 | "EHLO %s\r\n", sx.helo_data) >= 0 |
| 3228 | && smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), |
| 3229 | '2', sx.ob->command_timeout); |
| 3230 | } |
| 3231 | #endif |
| 3232 | |
| 3233 | /* If the socket is successfully passed, we mustn't send QUIT (or |
| 3234 | indeed anything!) from here. */ |
| 3235 | |
| 3236 | /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to |
| 3237 | propagate it from the initial |
| 3238 | */ |
| 3239 | if (sx.ok && transport_pass_socket(tblock->name, host->name, |
| 3240 | host->address, new_message_id, sx.inblock.sock)) |
| 3241 | sx.send_quit = FALSE; |
| 3242 | } |
| 3243 | |
| 3244 | /* If RSET failed and there are addresses left, they get deferred. */ |
| 3245 | |
| 3246 | else set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host |
| 3247 | #ifdef EXPERIMENTAL_DSN_INFO |
| 3248 | , sx.smtp_greeting, sx.helo_response |
| 3249 | #endif |
| 3250 | ); |
| 3251 | } |
| 3252 | } |
| 3253 | |
| 3254 | /* End off tidily with QUIT unless the connection has died or the socket has |
| 3255 | been passed to another process. There has been discussion on the net about what |
| 3256 | to do after sending QUIT. The wording of the RFC suggests that it is necessary |
| 3257 | to wait for a response, but on the other hand, there isn't anything one can do |
| 3258 | with an error response, other than log it. Exim used to do that. However, |
| 3259 | further discussion suggested that it is positively advantageous not to wait for |
| 3260 | the response, but to close the session immediately. This is supposed to move |
| 3261 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some |
| 3262 | load from the server. (Hosts that are both servers and clients may not see much |
| 3263 | difference, of course.) Further discussion indicated that this was safe to do |
| 3264 | on Unix systems which have decent implementations of TCP/IP that leave the |
| 3265 | connection around for a while (TIME_WAIT) after the application has gone away. |
| 3266 | This enables the response sent by the server to be properly ACKed rather than |
| 3267 | timed out, as can happen on broken TCP/IP implementations on other OS. |
| 3268 | |
| 3269 | This change is being made on 31-Jul-98. After over a year of trouble-free |
| 3270 | operation, the old commented-out code was removed on 17-Sep-99. */ |
| 3271 | |
| 3272 | SEND_QUIT: |
| 3273 | if (sx.send_quit) (void)smtp_write_command(&sx.outblock, FALSE, "QUIT\r\n"); |
| 3274 | |
| 3275 | END_OFF: |
| 3276 | |
| 3277 | #ifdef SUPPORT_TLS |
| 3278 | tls_close(FALSE, TRUE); |
| 3279 | #endif |
| 3280 | |
| 3281 | /* Close the socket, and return the appropriate value, first setting |
| 3282 | works because the NULL setting is passed back to the calling process, and |
| 3283 | remote_max_parallel is forced to 1 when delivering over an existing connection, |
| 3284 | |
| 3285 | If all went well and continue_more is set, we shouldn't actually get here if |
| 3286 | there are further addresses, as the return above will be taken. However, |
| 3287 | writing RSET might have failed, or there may be other addresses whose hosts are |
| 3288 | specified in the transports, and therefore not visible at top level, in which |
| 3289 | case continue_more won't get set. */ |
| 3290 | |
| 3291 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
| 3292 | if (sx.send_quit) |
| 3293 | { |
| 3294 | shutdown(sx.outblock.sock, SHUT_WR); |
| 3295 | if (fcntl(sx.inblock.sock, F_SETFL, O_NONBLOCK) == 0) |
| 3296 | for (rc = 16; read(sx.inblock.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && rc > 0;) |
| 3297 | rc--; /* drain socket */ |
| 3298 | } |
| 3299 | (void)close(sx.inblock.sock); |
| 3300 | |
| 3301 | #ifndef DISABLE_EVENT |
| 3302 | (void) event_raise(tblock->event_action, US"tcp:close", NULL); |
| 3303 | #endif |
| 3304 | |
| 3305 | continue_transport = NULL; |
| 3306 | continue_hostname = NULL; |
| 3307 | return yield; |
| 3308 | } |
| 3309 | |
| 3310 | |
| 3311 | |
| 3312 | |
| 3313 | /************************************************* |
| 3314 | * Closedown entry point * |
| 3315 | *************************************************/ |
| 3316 | |
| 3317 | /* This function is called when exim is passed an open smtp channel |
| 3318 | from another incarnation, but the message which it has been asked |
| 3319 | to deliver no longer exists. The channel is on stdin. |
| 3320 | |
| 3321 | We might do fancy things like looking for another message to send down |
| 3322 | the channel, but if the one we sought has gone, it has probably been |
| 3323 | delivered by some other process that itself will seek further messages, |
| 3324 | so just close down our connection. |
| 3325 | |
| 3326 | Argument: pointer to the transport instance block |
| 3327 | Returns: nothing |
| 3328 | */ |
| 3329 | |
| 3330 | void |
| 3331 | smtp_transport_closedown(transport_instance *tblock) |
| 3332 | { |
| 3333 | smtp_transport_options_block *ob = |
| 3334 | (smtp_transport_options_block *)tblock->options_block; |
| 3335 | smtp_inblock inblock; |
| 3336 | smtp_outblock outblock; |
| 3337 | uschar buffer[256]; |
| 3338 | uschar inbuffer[4096]; |
| 3339 | uschar outbuffer[16]; |
| 3340 | |
| 3341 | inblock.sock = fileno(stdin); |
| 3342 | inblock.buffer = inbuffer; |
| 3343 | inblock.buffersize = sizeof(inbuffer); |
| 3344 | inblock.ptr = inbuffer; |
| 3345 | inblock.ptrend = inbuffer; |
| 3346 | |
| 3347 | outblock.sock = inblock.sock; |
| 3348 | outblock.buffersize = sizeof(outbuffer); |
| 3349 | outblock.buffer = outbuffer; |
| 3350 | outblock.ptr = outbuffer; |
| 3351 | outblock.cmd_count = 0; |
| 3352 | outblock.authenticating = FALSE; |
| 3353 | |
| 3354 | (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); |
| 3355 | (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2', |
| 3356 | ob->command_timeout); |
| 3357 | (void)close(inblock.sock); |
| 3358 | } |
| 3359 | |
| 3360 | |
| 3361 | |
| 3362 | /************************************************* |
| 3363 | * Prepare addresses for delivery * |
| 3364 | *************************************************/ |
| 3365 | |
| 3366 | /* This function is called to flush out error settings from previous delivery |
| 3367 | attempts to other hosts. It also records whether we got here via an MX record |
| 3368 | or not in the more_errno field of the address. We are interested only in |
| 3369 | addresses that are still marked DEFER - others may have got delivered to a |
| 3370 | previously considered IP address. Set their status to PENDING_DEFER to indicate |
| 3371 | which ones are relevant this time. |
| 3372 | |
| 3373 | Arguments: |
| 3374 | addrlist the list of addresses |
| 3375 | host the host we are delivering to |
| 3376 | |
| 3377 | Returns: the first address for this delivery |
| 3378 | */ |
| 3379 | |
| 3380 | static address_item * |
| 3381 | prepare_addresses(address_item *addrlist, host_item *host) |
| 3382 | { |
| 3383 | address_item *first_addr = NULL; |
| 3384 | address_item *addr; |
| 3385 | for (addr = addrlist; addr; addr = addr->next) |
| 3386 | if (addr->transport_return == DEFER) |
| 3387 | { |
| 3388 | if (!first_addr) first_addr = addr; |
| 3389 | addr->transport_return = PENDING_DEFER; |
| 3390 | addr->basic_errno = 0; |
| 3391 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; |
| 3392 | addr->message = NULL; |
| 3393 | #ifdef SUPPORT_TLS |
| 3394 | addr->cipher = NULL; |
| 3395 | addr->ourcert = NULL; |
| 3396 | addr->peercert = NULL; |
| 3397 | addr->peerdn = NULL; |
| 3398 | addr->ocsp = OCSP_NOT_REQ; |
| 3399 | #endif |
| 3400 | #ifdef EXPERIMENTAL_DSN_INFO |
| 3401 | addr->smtp_greeting = NULL; |
| 3402 | addr->helo_response = NULL; |
| 3403 | #endif |
| 3404 | } |
| 3405 | return first_addr; |
| 3406 | } |
| 3407 | |
| 3408 | |
| 3409 | |
| 3410 | /************************************************* |
| 3411 | * Main entry point * |
| 3412 | *************************************************/ |
| 3413 | |
| 3414 | /* See local README for interface details. As this is a remote transport, it is |
| 3415 | given a chain of addresses to be delivered in one connection, if possible. It |
| 3416 | always returns TRUE, indicating that each address has its own independent |
| 3417 | status set, except if there is a setting up problem, in which case it returns |
| 3418 | FALSE. */ |
| 3419 | |
| 3420 | BOOL |
| 3421 | smtp_transport_entry( |
| 3422 | transport_instance *tblock, /* data for this instantiation */ |
| 3423 | address_item *addrlist) /* addresses we are working on */ |
| 3424 | { |
| 3425 | int cutoff_retry; |
| 3426 | int port; |
| 3427 | int hosts_defer = 0; |
| 3428 | int hosts_fail = 0; |
| 3429 | int hosts_looked_up = 0; |
| 3430 | int hosts_retry = 0; |
| 3431 | int hosts_serial = 0; |
| 3432 | int hosts_total = 0; |
| 3433 | int total_hosts_tried = 0; |
| 3434 | address_item *addr; |
| 3435 | BOOL expired = TRUE; |
| 3436 | uschar *expanded_hosts = NULL; |
| 3437 | uschar *pistring; |
| 3438 | uschar *tid = string_sprintf("%s transport", tblock->name); |
| 3439 | smtp_transport_options_block *ob = |
| 3440 | (smtp_transport_options_block *)(tblock->options_block); |
| 3441 | host_item *hostlist = addrlist->host_list; |
| 3442 | host_item *host = NULL; |
| 3443 | |
| 3444 | DEBUG(D_transport) |
| 3445 | { |
| 3446 | debug_printf("%s transport entered\n", tblock->name); |
| 3447 | for (addr = addrlist; addr; addr = addr->next) |
| 3448 | debug_printf(" %s\n", addr->address); |
| 3449 | if (hostlist) |
| 3450 | { |
| 3451 | debug_printf("hostlist:\n"); |
| 3452 | for (host = hostlist; host; host = host->next) |
| 3453 | debug_printf(" %s:%d\n", host->name, host->port); |
| 3454 | } |
| 3455 | if (continue_hostname) debug_printf("already connected to %s [%s]\n", |
| 3456 | continue_hostname, continue_host_address); |
| 3457 | } |
| 3458 | |
| 3459 | /* Set the flag requesting that these hosts be added to the waiting |
| 3460 | database if the delivery fails temporarily or if we are running with |
| 3461 | queue_smtp or a 2-stage queue run. This gets unset for certain |
| 3462 | kinds of error, typically those that are specific to the message. */ |
| 3463 | |
| 3464 | update_waiting = TRUE; |
| 3465 | |
| 3466 | /* If a host list is not defined for the addresses - they must all have the |
| 3467 | same one in order to be passed to a single transport - or if the transport has |
| 3468 | a host list with hosts_override set, use the host list supplied with the |
| 3469 | transport. It is an error for this not to exist. */ |
| 3470 | |
| 3471 | if (!hostlist || (ob->hosts_override && ob->hosts)) |
| 3472 | { |
| 3473 | if (!ob->hosts) |
| 3474 | { |
| 3475 | addrlist->message = string_sprintf("%s transport called with no hosts set", |
| 3476 | tblock->name); |
| 3477 | addrlist->transport_return = PANIC; |
| 3478 | return FALSE; /* Only top address has status */ |
| 3479 | } |
| 3480 | |
| 3481 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", |
| 3482 | ob->hosts); |
| 3483 | |
| 3484 | /* If the transport's host list contains no '$' characters, and we are not |
| 3485 | randomizing, it is fixed and therefore a chain of hosts can be built once |
| 3486 | and for all, and remembered for subsequent use by other calls to this |
| 3487 | transport. If, on the other hand, the host list does contain '$', or we are |
| 3488 | randomizing its order, we have to rebuild it each time. In the fixed case, |
| 3489 | as the hosts string will never be used again, it doesn't matter that we |
| 3490 | replace all the : characters with zeros. */ |
| 3491 | |
| 3492 | if (!ob->hostlist) |
| 3493 | { |
| 3494 | uschar *s = ob->hosts; |
| 3495 | |
| 3496 | if (Ustrchr(s, '$') != NULL) |
| 3497 | { |
| 3498 | if (!(expanded_hosts = expand_string(s))) |
| 3499 | { |
| 3500 | addrlist->message = string_sprintf("failed to expand list of hosts " |
| 3501 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); |
| 3502 | addrlist->transport_return = search_find_defer ? DEFER : PANIC; |
| 3503 | return FALSE; /* Only top address has status */ |
| 3504 | } |
| 3505 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " |
| 3506 | "\"%s\"\n", s, expanded_hosts); |
| 3507 | s = expanded_hosts; |
| 3508 | } |
| 3509 | else |
| 3510 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); |
| 3511 | |
| 3512 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); |
| 3513 | |
| 3514 | /* Check that the expansion yielded something useful. */ |
| 3515 | if (!hostlist) |
| 3516 | { |
| 3517 | addrlist->message = |
| 3518 | string_sprintf("%s transport has empty hosts setting", tblock->name); |
| 3519 | addrlist->transport_return = PANIC; |
| 3520 | return FALSE; /* Only top address has status */ |
| 3521 | } |
| 3522 | |
| 3523 | /* If there was no expansion of hosts, save the host list for |
| 3524 | next time. */ |
| 3525 | |
| 3526 | if (!expanded_hosts) ob->hostlist = hostlist; |
| 3527 | } |
| 3528 | |
| 3529 | /* This is not the first time this transport has been run in this delivery; |
| 3530 | the host list was built previously. */ |
| 3531 | |
| 3532 | else |
| 3533 | hostlist = ob->hostlist; |
| 3534 | } |
| 3535 | |
| 3536 | /* The host list was supplied with the address. If hosts_randomize is set, we |
| 3537 | must sort it into a random order if it did not come from MX records and has not |
| 3538 | already been randomized (but don't bother if continuing down an existing |
| 3539 | connection). */ |
| 3540 | |
| 3541 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname) |
| 3542 | { |
| 3543 | host_item *newlist = NULL; |
| 3544 | while (hostlist) |
| 3545 | { |
| 3546 | host_item *h = hostlist; |
| 3547 | hostlist = hostlist->next; |
| 3548 | |
| 3549 | h->sort_key = random_number(100); |
| 3550 | |
| 3551 | if (!newlist) |
| 3552 | { |
| 3553 | h->next = NULL; |
| 3554 | newlist = h; |
| 3555 | } |
| 3556 | else if (h->sort_key < newlist->sort_key) |
| 3557 | { |
| 3558 | h->next = newlist; |
| 3559 | newlist = h; |
| 3560 | } |
| 3561 | else |
| 3562 | { |
| 3563 | host_item *hh = newlist; |
| 3564 | while (hh->next) |
| 3565 | { |
| 3566 | if (h->sort_key < hh->next->sort_key) break; |
| 3567 | hh = hh->next; |
| 3568 | } |
| 3569 | h->next = hh->next; |
| 3570 | hh->next = h; |
| 3571 | } |
| 3572 | } |
| 3573 | |
| 3574 | hostlist = addrlist->host_list = newlist; |
| 3575 | } |
| 3576 | |
| 3577 | /* Sort out the default port. */ |
| 3578 | |
| 3579 | if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE; |
| 3580 | |
| 3581 | /* For each host-plus-IP-address on the list: |
| 3582 | |
| 3583 | . If this is a continued delivery and the host isn't the one with the |
| 3584 | current connection, skip. |
| 3585 | |
| 3586 | . If the status is unusable (i.e. previously failed or retry checked), skip. |
| 3587 | |
| 3588 | . If no IP address set, get the address, either by turning the name into |
| 3589 | an address, calling gethostbyname if gethostbyname is on, or by calling |
| 3590 | the DNS. The DNS may yield multiple addresses, in which case insert the |
| 3591 | extra ones into the list. |
| 3592 | |
| 3593 | . Get the retry data if not previously obtained for this address and set the |
| 3594 | field which remembers the state of this address. Skip if the retry time is |
| 3595 | not reached. If not, remember whether retry data was found. The retry string |
| 3596 | contains both the name and the IP address. |
| 3597 | |
| 3598 | . Scan the list of addresses and mark those whose status is DEFER as |
| 3599 | PENDING_DEFER. These are the only ones that will be processed in this cycle |
| 3600 | of the hosts loop. |
| 3601 | |
| 3602 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. |
| 3603 | Some addresses may be successfully delivered, others may fail, and yet |
| 3604 | others may get temporary errors and so get marked DEFER. |
| 3605 | |
| 3606 | . The return from the delivery attempt is OK if a connection was made and a |
| 3607 | valid SMTP dialogue was completed. Otherwise it is DEFER. |
| 3608 | |
| 3609 | . If OK, add a "remove" retry item for this host/IPaddress, if any. |
| 3610 | |
| 3611 | . If fail to connect, or other defer state, add a retry item. |
| 3612 | |
| 3613 | . If there are any addresses whose status is still DEFER, carry on to the |
| 3614 | next host/IPaddress, unless we have tried the number of hosts given |
| 3615 | by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that |
| 3616 | there is some fancy logic for hosts_max_try that means its limit can be |
| 3617 | overstepped in some circumstances. |
| 3618 | |
| 3619 | If we get to the end of the list, all hosts have deferred at least one address, |
| 3620 | or not reached their retry times. If delay_after_cutoff is unset, it requests a |
| 3621 | delivery attempt to those hosts whose last try was before the arrival time of |
| 3622 | the current message. To cope with this, we have to go round the loop a second |
| 3623 | time. After that, set the status and error data for any addresses that haven't |
| 3624 | had it set already. */ |
| 3625 | |
| 3626 | for (cutoff_retry = 0; |
| 3627 | expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2); |
| 3628 | cutoff_retry++) |
| 3629 | { |
| 3630 | host_item *nexthost = NULL; |
| 3631 | int unexpired_hosts_tried = 0; |
| 3632 | |
| 3633 | for (host = hostlist; |
| 3634 | host |
| 3635 | && unexpired_hosts_tried < ob->hosts_max_try |
| 3636 | && total_hosts_tried < ob->hosts_max_try_hardlimit; |
| 3637 | host = nexthost) |
| 3638 | { |
| 3639 | int rc; |
| 3640 | int host_af; |
| 3641 | uschar *rs; |
| 3642 | BOOL host_is_expired = FALSE; |
| 3643 | BOOL message_defer = FALSE; |
| 3644 | BOOL some_deferred = FALSE; |
| 3645 | address_item *first_addr = NULL; |
| 3646 | uschar *interface = NULL; |
| 3647 | uschar *retry_host_key = NULL; |
| 3648 | uschar *retry_message_key = NULL; |
| 3649 | uschar *serialize_key = NULL; |
| 3650 | |
| 3651 | /* Default next host is next host. :-) But this can vary if the |
| 3652 | hosts_max_try limit is hit (see below). It may also be reset if a host |
| 3653 | address is looked up here (in case the host was multihomed). */ |
| 3654 | |
| 3655 | nexthost = host->next; |
| 3656 | |
| 3657 | /* If the address hasn't yet been obtained from the host name, look it up |
| 3658 | now, unless the host is already marked as unusable. If it is marked as |
| 3659 | unusable, it means that the router was unable to find its IP address (in |
| 3660 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and |
| 3661 | the lookup failed last time. We don't get this far if *all* MX records |
| 3662 | point to non-existent hosts; that is treated as a hard error. |
| 3663 | |
| 3664 | We can just skip this host entirely. When the hosts came from the router, |
| 3665 | the address will timeout based on the other host(s); when the address is |
| 3666 | looked up below, there is an explicit retry record added. |
| 3667 | |
| 3668 | Note that we mustn't skip unusable hosts if the address is not unset; they |
| 3669 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ |
| 3670 | |
| 3671 | if (!host->address) |
| 3672 | { |
| 3673 | int new_port, flags; |
| 3674 | host_item *hh; |
| 3675 | |
| 3676 | if (host->status >= hstatus_unusable) |
| 3677 | { |
| 3678 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", |
| 3679 | host->name); |
| 3680 | continue; |
| 3681 | } |
| 3682 | |
| 3683 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); |
| 3684 | |
| 3685 | /* The host name is permitted to have an attached port. Find it, and |
| 3686 | strip it from the name. Just remember it for now. */ |
| 3687 | |
| 3688 | new_port = host_item_get_port(host); |
| 3689 | |
| 3690 | /* Count hosts looked up */ |
| 3691 | |
| 3692 | hosts_looked_up++; |
| 3693 | |
| 3694 | /* Find by name if so configured, or if it's an IP address. We don't |
| 3695 | just copy the IP address, because we need the test-for-local to happen. */ |
| 3696 | |
| 3697 | flags = HOST_FIND_BY_A; |
| 3698 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; |
| 3699 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; |
| 3700 | |
| 3701 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0) |
| 3702 | rc = host_find_byname(host, NULL, flags, NULL, TRUE); |
| 3703 | else |
| 3704 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
| 3705 | &ob->dnssec, /* domains for request/require */ |
| 3706 | NULL, NULL); |
| 3707 | |
| 3708 | /* Update the host (and any additional blocks, resulting from |
| 3709 | multihoming) with a host-specific port, if any. */ |
| 3710 | |
| 3711 | for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port; |
| 3712 | |
| 3713 | /* Failure to find the host at this time (usually DNS temporary failure) |
| 3714 | is really a kind of routing failure rather than a transport failure. |
| 3715 | Therefore we add a retry item of the routing kind, not to stop us trying |
| 3716 | to look this name up here again, but to ensure the address gets timed |
| 3717 | out if the failures go on long enough. A complete failure at this point |
| 3718 | commonly points to a configuration error, but the best action is still |
| 3719 | to carry on for the next host. */ |
| 3720 | |
| 3721 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED) |
| 3722 | { |
| 3723 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); |
| 3724 | expired = FALSE; |
| 3725 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; |
| 3726 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? |
| 3727 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); |
| 3728 | host->status = hstatus_unusable; |
| 3729 | |
| 3730 | for (addr = addrlist; addr; addr = addr->next) |
| 3731 | { |
| 3732 | if (addr->transport_return != DEFER) continue; |
| 3733 | addr->basic_errno = ERRNO_UNKNOWNHOST; |
| 3734 | addr->message = |
| 3735 | string_sprintf("failed to lookup IP address for %s", host->name); |
| 3736 | } |
| 3737 | continue; |
| 3738 | } |
| 3739 | |
| 3740 | /* If the host is actually the local host, we may have a problem, or |
| 3741 | there may be some cunning configuration going on. In the problem case, |
| 3742 | log things and give up. The default transport status is already DEFER. */ |
| 3743 | |
| 3744 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) |
| 3745 | { |
| 3746 | for (addr = addrlist; addr; addr = addr->next) |
| 3747 | { |
| 3748 | addr->basic_errno = 0; |
| 3749 | addr->message = string_sprintf("%s transport found host %s to be " |
| 3750 | "local", tblock->name, host->name); |
| 3751 | } |
| 3752 | goto END_TRANSPORT; |
| 3753 | } |
| 3754 | } /* End of block for IP address lookup */ |
| 3755 | |
| 3756 | /* If this is a continued delivery, we are interested only in the host |
| 3757 | which matches the name of the existing open channel. The check is put |
| 3758 | here after the local host lookup, in case the name gets expanded as a |
| 3759 | result of the lookup. Set expired FALSE, to save the outer loop executing |
| 3760 | twice. */ |
| 3761 | |
| 3762 | if ( continue_hostname |
| 3763 | && ( Ustrcmp(continue_hostname, host->name) != 0 |
| 3764 | || Ustrcmp(continue_host_address, host->address) != 0 |
| 3765 | ) ) |
| 3766 | { |
| 3767 | expired = FALSE; |
| 3768 | continue; /* With next host */ |
| 3769 | } |
| 3770 | |
| 3771 | /* Reset the default next host in case a multihomed host whose addresses |
| 3772 | are not looked up till just above added to the host list. */ |
| 3773 | |
| 3774 | nexthost = host->next; |
| 3775 | |
| 3776 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the |
| 3777 | domain is in queue_smtp_domains, we don't actually want to attempt any |
| 3778 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If |
| 3779 | there is a lookup defer in queue_smtp_domains, proceed as if the domain |
| 3780 | were not in it. We don't want to hold up all SMTP deliveries! Except when |
| 3781 | doing a two-stage queue run, don't do this if forcing. */ |
| 3782 | |
| 3783 | if ((!deliver_force || queue_2stage) && (queue_smtp || |
| 3784 | match_isinlist(addrlist->domain, |
| 3785 | (const uschar **)&queue_smtp_domains, 0, |
| 3786 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)) |
| 3787 | { |
| 3788 | expired = FALSE; |
| 3789 | for (addr = addrlist; addr; addr = addr->next) |
| 3790 | if (addr->transport_return == DEFER) |
| 3791 | addr->message = US"domain matches queue_smtp_domains, or -odqs set"; |
| 3792 | continue; /* With next host */ |
| 3793 | } |
| 3794 | |
| 3795 | /* Count hosts being considered - purely for an intelligent comment |
| 3796 | if none are usable. */ |
| 3797 | |
| 3798 | hosts_total++; |
| 3799 | |
| 3800 | /* Set $host and $host address now in case they are needed for the |
| 3801 | interface expansion or the serialize_hosts check; they remain set if an |
| 3802 | actual delivery happens. */ |
| 3803 | |
| 3804 | deliver_host = host->name; |
| 3805 | deliver_host_address = host->address; |
| 3806 | lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes" |
| 3807 | : host->dnssec == DS_NO ? US"no" |
| 3808 | : US""; |
| 3809 | |
| 3810 | /* Set up a string for adding to the retry key if the port number is not |
| 3811 | the standard SMTP port. A host may have its own port setting that overrides |
| 3812 | the default. */ |
| 3813 | |
| 3814 | pistring = string_sprintf(":%d", host->port == PORT_NONE |
| 3815 | ? port : host->port); |
| 3816 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; |
| 3817 | |
| 3818 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface |
| 3819 | string is set, even if constant (as different transports can have different |
| 3820 | constant settings), we must add it to the key that is used for retries, |
| 3821 | because connections to the same host from a different interface should be |
| 3822 | treated separately. */ |
| 3823 | |
| 3824 | host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6; |
| 3825 | if ((rs = ob->interface) && *rs) |
| 3826 | { |
| 3827 | if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid)) |
| 3828 | return FALSE; |
| 3829 | pistring = string_sprintf("%s/%s", pistring, interface); |
| 3830 | } |
| 3831 | |
| 3832 | /* The first time round the outer loop, check the status of the host by |
| 3833 | inspecting the retry data. The second time round, we are interested only |
| 3834 | in expired hosts that haven't been tried since this message arrived. */ |
| 3835 | |
| 3836 | if (cutoff_retry == 0) |
| 3837 | { |
| 3838 | BOOL incl_ip; |
| 3839 | /* Ensure the status of the address is set by checking retry data if |
| 3840 | necessary. There may be host-specific retry data (applicable to all |
| 3841 | messages) and also data for retries of a specific message at this host. |
| 3842 | If either of these retry records are actually read, the keys used are |
| 3843 | returned to save recomputing them later. */ |
| 3844 | |
| 3845 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, |
| 3846 | US"retry_include_ip_address", ob->retry_include_ip_address, |
| 3847 | ob->expand_retry_include_ip_address, &incl_ip) != OK) |
| 3848 | continue; /* with next host */ |
| 3849 | |
| 3850 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, |
| 3851 | incl_ip, &retry_host_key, &retry_message_key); |
| 3852 | |
| 3853 | DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name, |
| 3854 | (host->address == NULL)? US"" : host->address, pistring, |
| 3855 | (host->status == hstatus_usable)? "usable" : |
| 3856 | (host->status == hstatus_unusable)? "unusable" : |
| 3857 | (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?"); |
| 3858 | |
| 3859 | /* Skip this address if not usable at this time, noting if it wasn't |
| 3860 | actually expired, both locally and in the address. */ |
| 3861 | |
| 3862 | switch (host->status) |
| 3863 | { |
| 3864 | case hstatus_unusable: |
| 3865 | expired = FALSE; |
| 3866 | setflag(addrlist, af_retry_skipped); |
| 3867 | /* Fall through */ |
| 3868 | |
| 3869 | case hstatus_unusable_expired: |
| 3870 | switch (host->why) |
| 3871 | { |
| 3872 | case hwhy_retry: hosts_retry++; break; |
| 3873 | case hwhy_failed: hosts_fail++; break; |
| 3874 | case hwhy_deferred: hosts_defer++; break; |
| 3875 | } |
| 3876 | |
| 3877 | /* If there was a retry message key, implying that previously there |
| 3878 | was a message-specific defer, we don't want to update the list of |
| 3879 | messages waiting for these hosts. */ |
| 3880 | |
| 3881 | if (retry_message_key) update_waiting = FALSE; |
| 3882 | continue; /* With the next host or IP address */ |
| 3883 | } |
| 3884 | } |
| 3885 | |
| 3886 | /* Second time round the loop: if the address is set but expired, and |
| 3887 | the message is newer than the last try, let it through. */ |
| 3888 | |
| 3889 | else |
| 3890 | { |
| 3891 | if ( !host->address |
| 3892 | || host->status != hstatus_unusable_expired |
| 3893 | || host->last_try > received_time) |
| 3894 | continue; |
| 3895 | DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n", |
| 3896 | host->name, host->address, pistring); |
| 3897 | host_is_expired = TRUE; |
| 3898 | } |
| 3899 | |
| 3900 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; |
| 3901 | it remains TRUE only if all hosts are expired and none are actually tried. |
| 3902 | */ |
| 3903 | |
| 3904 | expired = FALSE; |
| 3905 | |
| 3906 | /* If this host is listed as one to which access must be serialized, |
| 3907 | see if another Exim process has a connection to it, and if so, skip |
| 3908 | this host. If not, update the database to record our connection to it |
| 3909 | and remember this for later deletion. Do not do any of this if we are |
| 3910 | sending the message down a pre-existing connection. */ |
| 3911 | |
| 3912 | if ( !continue_hostname |
| 3913 | && verify_check_given_host(&ob->serialize_hosts, host) == OK) |
| 3914 | { |
| 3915 | serialize_key = string_sprintf("host-serialize-%s", host->name); |
| 3916 | if (!enq_start(serialize_key, 1)) |
| 3917 | { |
| 3918 | DEBUG(D_transport) |
| 3919 | debug_printf("skipping host %s because another Exim process " |
| 3920 | "is connected to it\n", host->name); |
| 3921 | hosts_serial++; |
| 3922 | continue; |
| 3923 | } |
| 3924 | } |
| 3925 | |
| 3926 | /* OK, we have an IP address that is not waiting for its retry time to |
| 3927 | arrive (it might be expired) OR (second time round the loop) we have an |
| 3928 | expired host that hasn't been tried since the message arrived. Have a go |
| 3929 | at delivering the message to it. First prepare the addresses by flushing |
| 3930 | out the result of previous attempts, and finding the first address that |
| 3931 | is still to be delivered. */ |
| 3932 | |
| 3933 | first_addr = prepare_addresses(addrlist, host); |
| 3934 | |
| 3935 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", |
| 3936 | message_id, host->name, host->address, addrlist->address, |
| 3937 | addrlist->next ? ", ..." : ""); |
| 3938 | |
| 3939 | set_process_info("delivering %s to %s [%s] (%s%s)", |
| 3940 | message_id, host->name, host->address, addrlist->address, |
| 3941 | addrlist->next ? ", ..." : ""); |
| 3942 | |
| 3943 | /* This is not for real; don't do the delivery. If there are |
| 3944 | any remaining hosts, list them. */ |
| 3945 | |
| 3946 | if (dont_deliver) |
| 3947 | { |
| 3948 | host_item *host2; |
| 3949 | set_errno_nohost(addrlist, 0, NULL, OK, FALSE); |
| 3950 | for (addr = addrlist; addr; addr = addr->next) |
| 3951 | { |
| 3952 | addr->host_used = host; |
| 3953 | addr->special_action = '*'; |
| 3954 | addr->message = US"delivery bypassed by -N option"; |
| 3955 | } |
| 3956 | DEBUG(D_transport) |
| 3957 | { |
| 3958 | debug_printf("*** delivery by %s transport bypassed by -N option\n" |
| 3959 | "*** host and remaining hosts:\n", tblock->name); |
| 3960 | for (host2 = host; host2; host2 = host2->next) |
| 3961 | debug_printf(" %s [%s]\n", host2->name, |
| 3962 | host2->address ? host2->address : US"unset"); |
| 3963 | } |
| 3964 | rc = OK; |
| 3965 | } |
| 3966 | |
| 3967 | /* This is for real. If the host is expired, we don't count it for |
| 3968 | hosts_max_retry. This ensures that all hosts must expire before an address |
| 3969 | is timed out, unless hosts_max_try_hardlimit (which protects against |
| 3970 | lunatic DNS configurations) is reached. |
| 3971 | |
| 3972 | If the host is not expired and we are about to hit the hosts_max_retry |
| 3973 | limit, check to see if there is a subsequent hosts with a different MX |
| 3974 | value. If so, make that the next host, and don't count this one. This is a |
| 3975 | heuristic to make sure that different MXs do get tried. With a normal kind |
| 3976 | of retry rule, they would get tried anyway when the earlier hosts were |
| 3977 | delayed, but if the domain has a "retry every time" type of rule - as is |
| 3978 | often used for the the very large ISPs, that won't happen. */ |
| 3979 | |
| 3980 | else |
| 3981 | { |
| 3982 | host_item * thost; |
| 3983 | /* Make a copy of the host if it is local to this invocation |
| 3984 | of the transport. */ |
| 3985 | |
| 3986 | if (expanded_hosts) |
| 3987 | { |
| 3988 | thost = store_get(sizeof(host_item)); |
| 3989 | *thost = *host; |
| 3990 | thost->name = string_copy(host->name); |
| 3991 | thost->address = string_copy(host->address); |
| 3992 | } |
| 3993 | else |
| 3994 | thost = host; |
| 3995 | |
| 3996 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) |
| 3997 | { |
| 3998 | host_item *h; |
| 3999 | DEBUG(D_transport) |
| 4000 | debug_printf("hosts_max_try limit reached with this host\n"); |
| 4001 | for (h = host; h; h = h->next) if (h->mx != host->mx) |
| 4002 | { |
| 4003 | nexthost = h; |
| 4004 | unexpired_hosts_tried--; |
| 4005 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " |
| 4006 | "and will be tried\n"); |
| 4007 | break; |
| 4008 | } |
| 4009 | } |
| 4010 | |
| 4011 | /* Attempt the delivery. */ |
| 4012 | |
| 4013 | total_hosts_tried++; |
| 4014 | rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock, |
| 4015 | &message_defer, FALSE); |
| 4016 | |
| 4017 | /* Yield is one of: |
| 4018 | OK => connection made, each address contains its result; |
| 4019 | message_defer is set for message-specific defers (when all |
| 4020 | recipients are marked defer) |
| 4021 | DEFER => there was a non-message-specific delivery problem; |
| 4022 | ERROR => there was a problem setting up the arguments for a filter, |
| 4023 | or there was a problem with expanding added headers |
| 4024 | */ |
| 4025 | |
| 4026 | /* If the result is not OK, there was a non-message-specific problem. |
| 4027 | If the result is DEFER, we need to write to the logs saying what happened |
| 4028 | for this particular host, except in the case of authentication and TLS |
| 4029 | failures, where the log has already been written. If all hosts defer a |
| 4030 | general message is written at the end. */ |
| 4031 | |
| 4032 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL |
| 4033 | && first_addr->basic_errno != ERRNO_TLSFAILURE) |
| 4034 | write_logs(first_addr, host); |
| 4035 | |
| 4036 | #ifndef DISABLE_EVENT |
| 4037 | if (rc == DEFER) |
| 4038 | deferred_event_raise(first_addr, host); |
| 4039 | #endif |
| 4040 | |
| 4041 | /* If STARTTLS was accepted, but there was a failure in setting up the |
| 4042 | TLS session (usually a certificate screwup), and the host is not in |
| 4043 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with |
| 4044 | TLS forcibly turned off. We have to start from scratch with a new SMTP |
| 4045 | connection. That's why the retry is done from here, not from within |
| 4046 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the |
| 4047 | session, so the in-clear transmission after those errors, if permitted, |
| 4048 | happens inside smtp_deliver().] */ |
| 4049 | |
| 4050 | #ifdef SUPPORT_TLS |
| 4051 | if ( rc == DEFER |
| 4052 | && first_addr->basic_errno == ERRNO_TLSFAILURE |
| 4053 | && ob->tls_tempfail_tryclear |
| 4054 | && verify_check_given_host(&ob->hosts_require_tls, host) != OK |
| 4055 | ) |
| 4056 | { |
| 4057 | log_write(0, LOG_MAIN, |
| 4058 | "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)", |
| 4059 | first_addr->message, host->name, host->address); |
| 4060 | first_addr = prepare_addresses(addrlist, host); |
| 4061 | rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock, |
| 4062 | &message_defer, TRUE); |
| 4063 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) |
| 4064 | write_logs(first_addr, host); |
| 4065 | # ifndef DISABLE_EVENT |
| 4066 | if (rc == DEFER) |
| 4067 | deferred_event_raise(first_addr, host); |
| 4068 | # endif |
| 4069 | } |
| 4070 | #endif /*SUPPORT_TLS*/ |
| 4071 | } |
| 4072 | |
| 4073 | /* Delivery attempt finished */ |
| 4074 | |
| 4075 | rs = rc == OK ? US"OK" |
| 4076 | : rc == DEFER ? US"DEFER" |
| 4077 | : rc == ERROR ? US"ERROR" |
| 4078 | : US"?"; |
| 4079 | |
| 4080 | set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s", |
| 4081 | message_id, host->name, host->address, addrlist->address, |
| 4082 | addrlist->next ? " (& others)" : "", rs); |
| 4083 | |
| 4084 | /* Release serialization if set up */ |
| 4085 | |
| 4086 | if (serialize_key) enq_end(serialize_key); |
| 4087 | |
| 4088 | /* If the result is DEFER, or if a host retry record is known to exist, we |
| 4089 | need to add an item to the retry chain for updating the retry database |
| 4090 | at the end of delivery. We only need to add the item to the top address, |
| 4091 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it |
| 4092 | for any other delivery attempts using the same address. (It is copied into |
| 4093 | the unusable tree at the outer level, so even if different address blocks |
| 4094 | contain the same address, it still won't get tried again.) */ |
| 4095 | |
| 4096 | if (rc == DEFER || retry_host_key) |
| 4097 | { |
| 4098 | int delete_flag = rc != DEFER ? rf_delete : 0; |
| 4099 | if (!retry_host_key) |
| 4100 | { |
| 4101 | BOOL incl_ip; |
| 4102 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, |
| 4103 | US"retry_include_ip_address", ob->retry_include_ip_address, |
| 4104 | ob->expand_retry_include_ip_address, &incl_ip) != OK) |
| 4105 | incl_ip = TRUE; /* error; use most-specific retry record */ |
| 4106 | |
| 4107 | retry_host_key = incl_ip |
| 4108 | ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring) |
| 4109 | : string_sprintf("T:%S%s", host->name, pistring); |
| 4110 | } |
| 4111 | |
| 4112 | /* If a delivery of another message over an existing SMTP connection |
| 4113 | yields DEFER, we do NOT set up retry data for the host. This covers the |
| 4114 | case when there are delays in routing the addresses in the second message |
| 4115 | that are so long that the server times out. This is alleviated by not |
| 4116 | routing addresses that previously had routing defers when handling an |
| 4117 | existing connection, but even so, this case may occur (e.g. if a |
| 4118 | previously happily routed address starts giving routing defers). If the |
| 4119 | host is genuinely down, another non-continued message delivery will |
| 4120 | notice it soon enough. */ |
| 4121 | |
| 4122 | if (delete_flag != 0 || !continue_hostname) |
| 4123 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); |
| 4124 | |
| 4125 | /* We may have tried an expired host, if its retry time has come; ensure |
| 4126 | the status reflects the expiry for the benefit of any other addresses. */ |
| 4127 | |
| 4128 | if (rc == DEFER) |
| 4129 | { |
| 4130 | host->status = host_is_expired |
| 4131 | ? hstatus_unusable_expired : hstatus_unusable; |
| 4132 | host->why = hwhy_deferred; |
| 4133 | } |
| 4134 | } |
| 4135 | |
| 4136 | /* If message_defer is set (host was OK, but every recipient got deferred |
| 4137 | because of some message-specific problem), or if that had happened |
| 4138 | previously so that a message retry key exists, add an appropriate item |
| 4139 | to the retry chain. Note that if there was a message defer but now there is |
| 4140 | a host defer, the message defer record gets deleted. That seems perfectly |
| 4141 | reasonable. Also, stop the message from being remembered as waiting |
| 4142 | for specific hosts. */ |
| 4143 | |
| 4144 | if (message_defer || retry_message_key) |
| 4145 | { |
| 4146 | int delete_flag = message_defer ? 0 : rf_delete; |
| 4147 | if (!retry_message_key) |
| 4148 | { |
| 4149 | BOOL incl_ip; |
| 4150 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, |
| 4151 | US"retry_include_ip_address", ob->retry_include_ip_address, |
| 4152 | ob->expand_retry_include_ip_address, &incl_ip) != OK) |
| 4153 | incl_ip = TRUE; /* error; use most-specific retry record */ |
| 4154 | |
| 4155 | retry_message_key = incl_ip |
| 4156 | ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, |
| 4157 | message_id) |
| 4158 | : string_sprintf("T:%S%s:%s", host->name, pistring, message_id); |
| 4159 | } |
| 4160 | retry_add_item(addrlist, retry_message_key, |
| 4161 | rf_message | rf_host | delete_flag); |
| 4162 | update_waiting = FALSE; |
| 4163 | } |
| 4164 | |
| 4165 | /* Any return other than DEFER (that is, OK or ERROR) means that the |
| 4166 | addresses have got their final statuses filled in for this host. In the OK |
| 4167 | case, see if any of them are deferred. */ |
| 4168 | |
| 4169 | if (rc == OK) |
| 4170 | for (addr = addrlist; addr; addr = addr->next) |
| 4171 | if (addr->transport_return == DEFER) |
| 4172 | { |
| 4173 | some_deferred = TRUE; |
| 4174 | break; |
| 4175 | } |
| 4176 | |
| 4177 | /* If no addresses deferred or the result was ERROR, return. We do this for |
| 4178 | ERROR because a failing filter set-up or add_headers expansion is likely to |
| 4179 | fail for any host we try. */ |
| 4180 | |
| 4181 | if (rc == ERROR || (rc == OK && !some_deferred)) |
| 4182 | { |
| 4183 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); |
| 4184 | return TRUE; /* Each address has its status */ |
| 4185 | } |
| 4186 | |
| 4187 | /* If the result was DEFER or some individual addresses deferred, let |
| 4188 | the loop run to try other hosts with the deferred addresses, except for the |
| 4189 | case when we were trying to deliver down an existing channel and failed. |
| 4190 | Don't try any other hosts in this case. */ |
| 4191 | |
| 4192 | if (continue_hostname) break; |
| 4193 | |
| 4194 | /* If the whole delivery, or some individual addresses, were deferred and |
| 4195 | there are more hosts that could be tried, do not count this host towards |
| 4196 | the hosts_max_try limit if the age of the message is greater than the |
| 4197 | maximum retry time for this host. This means we may try try all hosts, |
| 4198 | ignoring the limit, when messages have been around for some time. This is |
| 4199 | important because if we don't try all hosts, the address will never time |
| 4200 | out. NOTE: this does not apply to hosts_max_try_hardlimit. */ |
| 4201 | |
| 4202 | if ((rc == DEFER || some_deferred) && nexthost) |
| 4203 | { |
| 4204 | BOOL timedout; |
| 4205 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); |
| 4206 | |
| 4207 | if (retry && retry->rules) |
| 4208 | { |
| 4209 | retry_rule *last_rule; |
| 4210 | for (last_rule = retry->rules; |
| 4211 | last_rule->next; |
| 4212 | last_rule = last_rule->next); |
| 4213 | timedout = time(NULL) - received_time > last_rule->timeout; |
| 4214 | } |
| 4215 | else timedout = TRUE; /* No rule => timed out */ |
| 4216 | |
| 4217 | if (timedout) |
| 4218 | { |
| 4219 | unexpired_hosts_tried--; |
| 4220 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " |
| 4221 | "hosts_max_try (message older than host's retry time)\n"); |
| 4222 | } |
| 4223 | } |
| 4224 | } /* End of loop for trying multiple hosts. */ |
| 4225 | |
| 4226 | /* This is the end of the loop that repeats iff expired is TRUE and |
| 4227 | ob->delay_after_cutoff is FALSE. The second time round we will |
| 4228 | try those hosts that haven't been tried since the message arrived. */ |
| 4229 | |
| 4230 | DEBUG(D_transport) |
| 4231 | { |
| 4232 | debug_printf("all IP addresses skipped or deferred at least one address\n"); |
| 4233 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) |
| 4234 | debug_printf("retrying IP addresses not tried since message arrived\n"); |
| 4235 | } |
| 4236 | } |
| 4237 | |
| 4238 | |
| 4239 | /* Get here if all IP addresses are skipped or defer at least one address. In |
| 4240 | MUA wrapper mode, this will happen only for connection or other non-message- |
| 4241 | specific failures. Force the delivery status for all addresses to FAIL. */ |
| 4242 | |
| 4243 | if (mua_wrapper) |
| 4244 | { |
| 4245 | for (addr = addrlist; addr; addr = addr->next) |
| 4246 | addr->transport_return = FAIL; |
| 4247 | goto END_TRANSPORT; |
| 4248 | } |
| 4249 | |
| 4250 | /* In the normal, non-wrapper case, add a standard message to each deferred |
| 4251 | address if there hasn't been an error, that is, if it hasn't actually been |
| 4252 | tried this time. The variable "expired" will be FALSE if any deliveries were |
| 4253 | actually tried, or if there was at least one host that was not expired. That |
| 4254 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If |
| 4255 | a delivery has been tried, an error code will be set, and the failing of the |
| 4256 | message is handled by the retry code later. |
| 4257 | |
| 4258 | If queue_smtp is set, or this transport was called to send a subsequent message |
| 4259 | down an existing TCP/IP connection, and something caused the host not to be |
| 4260 | found, we end up here, but can detect these cases and handle them specially. */ |
| 4261 | |
| 4262 | for (addr = addrlist; addr; addr = addr->next) |
| 4263 | { |
| 4264 | /* If host is not NULL, it means that we stopped processing the host list |
| 4265 | because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this |
| 4266 | means we need to behave as if some hosts were skipped because their retry |
| 4267 | time had not come. Specifically, this prevents the address from timing out. |
| 4268 | However, if we have hit hosts_max_try_hardlimit, we want to behave as if all |
| 4269 | hosts were tried. */ |
| 4270 | |
| 4271 | if (host) |
| 4272 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
| 4273 | { |
| 4274 | DEBUG(D_transport) |
| 4275 | debug_printf("hosts_max_try_hardlimit reached: behave as if all " |
| 4276 | "hosts were tried\n"); |
| 4277 | } |
| 4278 | else |
| 4279 | { |
| 4280 | DEBUG(D_transport) |
| 4281 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); |
| 4282 | setflag(addr, af_retry_skipped); |
| 4283 | } |
| 4284 | |
| 4285 | if (queue_smtp) /* no deliveries attempted */ |
| 4286 | { |
| 4287 | addr->transport_return = DEFER; |
| 4288 | addr->basic_errno = 0; |
| 4289 | addr->message = US"SMTP delivery explicitly queued"; |
| 4290 | } |
| 4291 | |
| 4292 | else if ( addr->transport_return == DEFER |
| 4293 | && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) |
| 4294 | && !addr->message |
| 4295 | ) |
| 4296 | { |
| 4297 | addr->basic_errno = ERRNO_HRETRY; |
| 4298 | if (continue_hostname) |
| 4299 | addr->message = US"no host found for existing SMTP connection"; |
| 4300 | else if (expired) |
| 4301 | { |
| 4302 | setflag(addr, af_pass_message); /* This is not a security risk */ |
| 4303 | addr->message = string_sprintf( |
| 4304 | "all hosts%s have been failing for a long time %s", |
| 4305 | addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"", |
| 4306 | ob->delay_after_cutoff |
| 4307 | ? US"(and retry time not reached)" |
| 4308 | : US"and were last tried after this message arrived"); |
| 4309 | |
| 4310 | /* If we are already using fallback hosts, or there are no fallback hosts |
| 4311 | defined, convert the result to FAIL to cause a bounce. */ |
| 4312 | |
| 4313 | if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts) |
| 4314 | addr->transport_return = FAIL; |
| 4315 | } |
| 4316 | else |
| 4317 | { |
| 4318 | const char * s; |
| 4319 | if (hosts_retry == hosts_total) |
| 4320 | s = "retry time not reached for any host%s"; |
| 4321 | else if (hosts_fail == hosts_total) |
| 4322 | s = "all host address lookups%s failed permanently"; |
| 4323 | else if (hosts_defer == hosts_total) |
| 4324 | s = "all host address lookups%s failed temporarily"; |
| 4325 | else if (hosts_serial == hosts_total) |
| 4326 | s = "connection limit reached for all hosts%s"; |
| 4327 | else if (hosts_fail+hosts_defer == hosts_total) |
| 4328 | s = "all host address lookups%s failed"; |
| 4329 | else |
| 4330 | s = "some host address lookups failed and retry time " |
| 4331 | "not reached for other hosts or connection limit reached%s"; |
| 4332 | |
| 4333 | addr->message = string_sprintf(s, |
| 4334 | addr->domain ? string_sprintf(" for '%s'", addr->domain) : US""); |
| 4335 | } |
| 4336 | } |
| 4337 | } |
| 4338 | |
| 4339 | /* Update the database which keeps information about which messages are waiting |
| 4340 | for which hosts to become available. For some message-specific errors, the |
| 4341 | update_waiting flag is turned off because we don't want follow-on deliveries in |
| 4342 | those cases. If this transport instance is explicitly limited to one message |
| 4343 | per connection then follow-on deliveries are not possible and there's no need |
| 4344 | to create/update the per-transport wait-<transport_name> database. */ |
| 4345 | |
| 4346 | if (update_waiting && tblock->connection_max_messages != 1) |
| 4347 | transport_update_waiting(hostlist, tblock->name); |
| 4348 | |
| 4349 | END_TRANSPORT: |
| 4350 | |
| 4351 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); |
| 4352 | |
| 4353 | return TRUE; /* Each address has its status */ |
| 4354 | } |
| 4355 | |
| 4356 | /* vi: aw ai sw=2 |
| 4357 | */ |
| 4358 | /* End of transport/smtp.c */ |