| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
| 6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | |
| 8 | #include "../exim.h" |
| 9 | #include "smtp.h" |
| 10 | |
| 11 | #if defined(SUPPORT_DANE) && defined(DISABLE_TLS) |
| 12 | # error TLS is required for DANE |
| 13 | #endif |
| 14 | |
| 15 | |
| 16 | /* Options specific to the smtp transport. This transport also supports LMTP |
| 17 | over TCP/IP. The options must be in alphabetic order (note that "_" comes |
| 18 | before the lower case letters). Some live in the transport_instance block so as |
| 19 | to be publicly visible; these are flagged with opt_public. */ |
| 20 | |
| 21 | #define LOFF(field) OPT_OFF(smtp_transport_options_block, field) |
| 22 | |
| 23 | optionlist smtp_transport_options[] = { |
| 24 | { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public, |
| 25 | OPT_OFF(transport_instance, expand_multi_domain) }, |
| 26 | { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden, |
| 27 | LOFF(expand_retry_include_ip_address) }, |
| 28 | |
| 29 | { "address_retry_include_sender", opt_bool, |
| 30 | LOFF(address_retry_include_sender) }, |
| 31 | { "allow_localhost", opt_bool, LOFF(allow_localhost) }, |
| 32 | #ifdef EXPERIMENTAL_ARC |
| 33 | { "arc_sign", opt_stringptr, LOFF(arc_sign) }, |
| 34 | #endif |
| 35 | { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) }, |
| 36 | { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) }, |
| 37 | { "command_timeout", opt_time, LOFF(command_timeout) }, |
| 38 | { "connect_timeout", opt_time, LOFF(connect_timeout) }, |
| 39 | { "connection_max_messages", opt_int | opt_public, |
| 40 | OPT_OFF(transport_instance, connection_max_messages) }, |
| 41 | # ifdef SUPPORT_DANE |
| 42 | { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) }, |
| 43 | # endif |
| 44 | { "data_timeout", opt_time, LOFF(data_timeout) }, |
| 45 | { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) }, |
| 46 | #ifndef DISABLE_DKIM |
| 47 | { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) }, |
| 48 | { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) }, |
| 49 | { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) }, |
| 50 | { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) }, |
| 51 | { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) }, |
| 52 | { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) }, |
| 53 | { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) }, |
| 54 | { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) }, |
| 55 | { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) }, |
| 56 | #endif |
| 57 | { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) }, |
| 58 | { "dns_search_parents", opt_bool, LOFF(dns_search_parents) }, |
| 59 | { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) }, |
| 60 | { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) }, |
| 61 | { "dscp", opt_stringptr, LOFF(dscp) }, |
| 62 | { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) }, |
| 63 | { "final_timeout", opt_time, LOFF(final_timeout) }, |
| 64 | { "gethostbyname", opt_bool, LOFF(gethostbyname) }, |
| 65 | { "helo_data", opt_stringptr, LOFF(helo_data) }, |
| 66 | { "hosts", opt_stringptr, LOFF(hosts) }, |
| 67 | { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) }, |
| 68 | { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) }, |
| 69 | #ifndef DISABLE_TLS |
| 70 | { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) }, |
| 71 | #endif |
| 72 | { "hosts_max_try", opt_int, LOFF(hosts_max_try) }, |
| 73 | { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) }, |
| 74 | #ifndef DISABLE_TLS |
| 75 | { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) }, |
| 76 | { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) }, |
| 77 | #endif |
| 78 | { "hosts_override", opt_bool, LOFF(hosts_override) }, |
| 79 | #ifndef DISABLE_PIPE_CONNECT |
| 80 | { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) }, |
| 81 | #endif |
| 82 | { "hosts_randomize", opt_bool, LOFF(hosts_randomize) }, |
| 83 | #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP) |
| 84 | { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) }, |
| 85 | #endif |
| 86 | { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) }, |
| 87 | #ifndef DISABLE_TLS |
| 88 | # ifdef SUPPORT_DANE |
| 89 | { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) }, |
| 90 | # endif |
| 91 | # ifndef DISABLE_OCSP |
| 92 | { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) }, |
| 93 | # endif |
| 94 | { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) }, |
| 95 | #endif |
| 96 | { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) }, |
| 97 | { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) }, |
| 98 | #ifdef SUPPORT_DANE |
| 99 | { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) }, |
| 100 | #endif |
| 101 | { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) }, |
| 102 | #ifndef DISABLE_PRDR |
| 103 | { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) }, |
| 104 | #endif |
| 105 | #ifndef DISABLE_TLS |
| 106 | { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) }, |
| 107 | #endif |
| 108 | { "interface", opt_stringptr, LOFF(interface) }, |
| 109 | { "keepalive", opt_bool, LOFF(keepalive) }, |
| 110 | { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) }, |
| 111 | { "max_rcpt", opt_int | opt_public, |
| 112 | OPT_OFF(transport_instance, max_addresses) }, |
| 113 | { "multi_domain", opt_expand_bool | opt_public, |
| 114 | OPT_OFF(transport_instance, multi_domain) }, |
| 115 | { "port", opt_stringptr, LOFF(port) }, |
| 116 | { "protocol", opt_stringptr, LOFF(protocol) }, |
| 117 | { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) }, |
| 118 | { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) }, |
| 119 | { "size_addition", opt_int, LOFF(size_addition) }, |
| 120 | #ifdef SUPPORT_SOCKS |
| 121 | { "socks_proxy", opt_stringptr, LOFF(socks_proxy) }, |
| 122 | #endif |
| 123 | #ifndef DISABLE_TLS |
| 124 | { "tls_certificate", opt_stringptr, LOFF(tls_certificate) }, |
| 125 | { "tls_crl", opt_stringptr, LOFF(tls_crl) }, |
| 126 | { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) }, |
| 127 | { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) }, |
| 128 | { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) }, |
| 129 | # ifdef EXPERIMENTAL_TLS_RESUME |
| 130 | { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) }, |
| 131 | # endif |
| 132 | { "tls_sni", opt_stringptr, LOFF(tls_sni) }, |
| 133 | { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) }, |
| 134 | { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) }, |
| 135 | { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)}, |
| 136 | { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) }, |
| 137 | { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) }, |
| 138 | #endif |
| 139 | #ifdef SUPPORT_I18N |
| 140 | { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) }, |
| 141 | #endif |
| 142 | }; |
| 143 | |
| 144 | /* Size of the options list. An extern variable has to be used so that its |
| 145 | address can appear in the tables drtables.c. */ |
| 146 | |
| 147 | int smtp_transport_options_count = nelem(smtp_transport_options); |
| 148 | |
| 149 | |
| 150 | #ifdef MACRO_PREDEF |
| 151 | |
| 152 | /* Dummy values */ |
| 153 | smtp_transport_options_block smtp_transport_option_defaults = {0}; |
| 154 | void smtp_transport_init(transport_instance *tblock) {} |
| 155 | BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;} |
| 156 | void smtp_transport_closedown(transport_instance *tblock) {} |
| 157 | |
| 158 | #else /*!MACRO_PREDEF*/ |
| 159 | |
| 160 | |
| 161 | /* Default private options block for the smtp transport. */ |
| 162 | |
| 163 | smtp_transport_options_block smtp_transport_option_defaults = { |
| 164 | .hosts = NULL, |
| 165 | .fallback_hosts = NULL, |
| 166 | .hostlist = NULL, |
| 167 | .fallback_hostlist = NULL, |
| 168 | .helo_data = US"$primary_hostname", |
| 169 | .interface = NULL, |
| 170 | .port = NULL, |
| 171 | .protocol = US"smtp", |
| 172 | .dscp = NULL, |
| 173 | .serialize_hosts = NULL, |
| 174 | .hosts_try_auth = NULL, |
| 175 | .hosts_require_auth = NULL, |
| 176 | .hosts_try_chunking = US"*", |
| 177 | #ifdef SUPPORT_DANE |
| 178 | .hosts_try_dane = US"*", |
| 179 | .hosts_require_dane = NULL, |
| 180 | .dane_require_tls_ciphers = NULL, |
| 181 | #endif |
| 182 | .hosts_try_fastopen = US"*", |
| 183 | #ifndef DISABLE_PRDR |
| 184 | .hosts_try_prdr = US"*", |
| 185 | #endif |
| 186 | #ifndef DISABLE_OCSP |
| 187 | .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */ |
| 188 | .hosts_require_ocsp = NULL, |
| 189 | #endif |
| 190 | .hosts_require_tls = NULL, |
| 191 | .hosts_avoid_tls = NULL, |
| 192 | .hosts_verify_avoid_tls = NULL, |
| 193 | .hosts_avoid_pipelining = NULL, |
| 194 | #ifndef DISABLE_PIPE_CONNECT |
| 195 | .hosts_pipe_connect = NULL, |
| 196 | #endif |
| 197 | .hosts_avoid_esmtp = NULL, |
| 198 | #ifndef DISABLE_TLS |
| 199 | .hosts_nopass_tls = NULL, |
| 200 | .hosts_noproxy_tls = NULL, |
| 201 | #endif |
| 202 | .command_timeout = 5*60, |
| 203 | .connect_timeout = 5*60, |
| 204 | .data_timeout = 5*60, |
| 205 | .final_timeout = 10*60, |
| 206 | .size_addition = 1024, |
| 207 | .hosts_max_try = 5, |
| 208 | .hosts_max_try_hardlimit = 50, |
| 209 | .address_retry_include_sender = TRUE, |
| 210 | .allow_localhost = FALSE, |
| 211 | .authenticated_sender_force = FALSE, |
| 212 | .gethostbyname = FALSE, |
| 213 | .dns_qualify_single = TRUE, |
| 214 | .dns_search_parents = FALSE, |
| 215 | .dnssec = { .request= US"*", .require=NULL }, |
| 216 | .delay_after_cutoff = TRUE, |
| 217 | .hosts_override = FALSE, |
| 218 | .hosts_randomize = FALSE, |
| 219 | .keepalive = TRUE, |
| 220 | .lmtp_ignore_quota = FALSE, |
| 221 | .expand_retry_include_ip_address = NULL, |
| 222 | .retry_include_ip_address = TRUE, |
| 223 | #ifdef SUPPORT_SOCKS |
| 224 | .socks_proxy = NULL, |
| 225 | #endif |
| 226 | #ifndef DISABLE_TLS |
| 227 | .tls_certificate = NULL, |
| 228 | .tls_crl = NULL, |
| 229 | .tls_privatekey = NULL, |
| 230 | .tls_require_ciphers = NULL, |
| 231 | .tls_sni = NULL, |
| 232 | .tls_verify_certificates = US"system", |
| 233 | .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS, |
| 234 | .tls_tempfail_tryclear = TRUE, |
| 235 | # ifdef EXPERIMENTAL_TLS_RESUME |
| 236 | .tls_resumption_hosts = NULL, |
| 237 | # endif |
| 238 | .tls_verify_hosts = NULL, |
| 239 | .tls_try_verify_hosts = US"*", |
| 240 | .tls_verify_cert_hostnames = US"*", |
| 241 | #endif |
| 242 | #ifdef SUPPORT_I18N |
| 243 | .utf8_downconvert = NULL, |
| 244 | #endif |
| 245 | #ifndef DISABLE_DKIM |
| 246 | .dkim = |
| 247 | {.dkim_domain = NULL, |
| 248 | .dkim_identity = NULL, |
| 249 | .dkim_private_key = NULL, |
| 250 | .dkim_selector = NULL, |
| 251 | .dkim_canon = NULL, |
| 252 | .dkim_sign_headers = NULL, |
| 253 | .dkim_strict = NULL, |
| 254 | .dkim_hash = US"sha256", |
| 255 | .dkim_timestamps = NULL, |
| 256 | .dot_stuffed = FALSE, |
| 257 | .force_bodyhash = FALSE, |
| 258 | # ifdef EXPERIMENTAL_ARC |
| 259 | .arc_signspec = NULL, |
| 260 | # endif |
| 261 | }, |
| 262 | # ifdef EXPERIMENTAL_ARC |
| 263 | .arc_sign = NULL, |
| 264 | # endif |
| 265 | #endif |
| 266 | }; |
| 267 | |
| 268 | /* some DSN flags for use later */ |
| 269 | |
| 270 | static int rf_list[] = {rf_notify_never, rf_notify_success, |
| 271 | rf_notify_failure, rf_notify_delay }; |
| 272 | |
| 273 | static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" }; |
| 274 | |
| 275 | |
| 276 | |
| 277 | /* Local statics */ |
| 278 | |
| 279 | static uschar *smtp_command; /* Points to last cmd for error messages */ |
| 280 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ |
| 281 | static uschar *data_command = US""; /* Points to DATA cmd for error messages */ |
| 282 | static BOOL update_waiting; /* TRUE to update the "wait" database */ |
| 283 | |
| 284 | /*XXX move to smtp_context */ |
| 285 | static BOOL pipelining_active; /* current transaction is in pipe mode */ |
| 286 | |
| 287 | |
| 288 | static unsigned ehlo_response(uschar * buf, unsigned checks); |
| 289 | |
| 290 | |
| 291 | /******************************************************************************/ |
| 292 | |
| 293 | void |
| 294 | smtp_deliver_init(void) |
| 295 | { |
| 296 | if (!regex_PIPELINING) regex_PIPELINING = |
| 297 | regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE); |
| 298 | |
| 299 | if (!regex_SIZE) regex_SIZE = |
| 300 | regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE); |
| 301 | |
| 302 | if (!regex_AUTH) regex_AUTH = |
| 303 | regex_must_compile(AUTHS_REGEX, FALSE, TRUE); |
| 304 | |
| 305 | #ifndef DISABLE_TLS |
| 306 | if (!regex_STARTTLS) regex_STARTTLS = |
| 307 | regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE); |
| 308 | #endif |
| 309 | |
| 310 | if (!regex_CHUNKING) regex_CHUNKING = |
| 311 | regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE); |
| 312 | |
| 313 | #ifndef DISABLE_PRDR |
| 314 | if (!regex_PRDR) regex_PRDR = |
| 315 | regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE); |
| 316 | #endif |
| 317 | |
| 318 | #ifdef SUPPORT_I18N |
| 319 | if (!regex_UTF8) regex_UTF8 = |
| 320 | regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE); |
| 321 | #endif |
| 322 | |
| 323 | if (!regex_DSN) regex_DSN = |
| 324 | regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE); |
| 325 | |
| 326 | if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA = |
| 327 | regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE); |
| 328 | |
| 329 | #ifndef DISABLE_PIPE_CONNECT |
| 330 | if (!regex_EARLY_PIPE) regex_EARLY_PIPE = |
| 331 | regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE); |
| 332 | #endif |
| 333 | } |
| 334 | |
| 335 | |
| 336 | /************************************************* |
| 337 | * Setup entry point * |
| 338 | *************************************************/ |
| 339 | |
| 340 | /* This function is called when the transport is about to be used, |
| 341 | but before running it in a sub-process. It is used for two things: |
| 342 | |
| 343 | (1) To set the fallback host list in addresses, when delivering. |
| 344 | (2) To pass back the interface, port, protocol, and other options, for use |
| 345 | during callout verification. |
| 346 | |
| 347 | Arguments: |
| 348 | tblock pointer to the transport instance block |
| 349 | addrlist list of addresses about to be transported |
| 350 | tf if not NULL, pointer to block in which to return options |
| 351 | uid the uid that will be set (not used) |
| 352 | gid the gid that will be set (not used) |
| 353 | errmsg place for error message (not used) |
| 354 | |
| 355 | Returns: OK always (FAIL, DEFER not used) |
| 356 | */ |
| 357 | |
| 358 | static int |
| 359 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, |
| 360 | transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg) |
| 361 | { |
| 362 | smtp_transport_options_block *ob = SOB tblock->options_block; |
| 363 | |
| 364 | errmsg = errmsg; /* Keep picky compilers happy */ |
| 365 | uid = uid; |
| 366 | gid = gid; |
| 367 | |
| 368 | /* Pass back options if required. This interface is getting very messy. */ |
| 369 | |
| 370 | if (tf) |
| 371 | { |
| 372 | tf->interface = ob->interface; |
| 373 | tf->port = ob->port; |
| 374 | tf->protocol = ob->protocol; |
| 375 | tf->hosts = ob->hosts; |
| 376 | tf->hosts_override = ob->hosts_override; |
| 377 | tf->hosts_randomize = ob->hosts_randomize; |
| 378 | tf->gethostbyname = ob->gethostbyname; |
| 379 | tf->qualify_single = ob->dns_qualify_single; |
| 380 | tf->search_parents = ob->dns_search_parents; |
| 381 | tf->helo_data = ob->helo_data; |
| 382 | } |
| 383 | |
| 384 | /* Set the fallback host list for all the addresses that don't have fallback |
| 385 | host lists, provided that the local host wasn't present in the original host |
| 386 | list. */ |
| 387 | |
| 388 | if (!testflag(addrlist, af_local_host_removed)) |
| 389 | for (; addrlist; addrlist = addrlist->next) |
| 390 | if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist; |
| 391 | |
| 392 | return OK; |
| 393 | } |
| 394 | |
| 395 | |
| 396 | |
| 397 | /************************************************* |
| 398 | * Initialization entry point * |
| 399 | *************************************************/ |
| 400 | |
| 401 | /* Called for each instance, after its options have been read, to |
| 402 | enable consistency checks to be done, or anything else that needs |
| 403 | to be set up. |
| 404 | |
| 405 | Argument: pointer to the transport instance block |
| 406 | Returns: nothing |
| 407 | */ |
| 408 | |
| 409 | void |
| 410 | smtp_transport_init(transport_instance *tblock) |
| 411 | { |
| 412 | smtp_transport_options_block *ob = SOB tblock->options_block; |
| 413 | |
| 414 | /* Retry_use_local_part defaults FALSE if unset */ |
| 415 | |
| 416 | if (tblock->retry_use_local_part == TRUE_UNSET) |
| 417 | tblock->retry_use_local_part = FALSE; |
| 418 | |
| 419 | /* Set the default port according to the protocol */ |
| 420 | |
| 421 | if (!ob->port) |
| 422 | ob->port = strcmpic(ob->protocol, US"lmtp") == 0 |
| 423 | ? US"lmtp" |
| 424 | : strcmpic(ob->protocol, US"smtps") == 0 |
| 425 | ? US"smtps" : US"smtp"; |
| 426 | |
| 427 | /* Set up the setup entry point, to be called before subprocesses for this |
| 428 | transport. */ |
| 429 | |
| 430 | tblock->setup = smtp_transport_setup; |
| 431 | |
| 432 | /* Complain if any of the timeouts are zero. */ |
| 433 | |
| 434 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || |
| 435 | ob->final_timeout <= 0) |
| 436 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, |
| 437 | "command, data, or final timeout value is zero for %s transport", |
| 438 | tblock->name); |
| 439 | |
| 440 | /* If hosts_override is set and there are local hosts, set the global |
| 441 | flag that stops verify from showing router hosts. */ |
| 442 | |
| 443 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; |
| 444 | |
| 445 | /* If there are any fallback hosts listed, build a chain of host items |
| 446 | for them, but do not do any lookups at this time. */ |
| 447 | |
| 448 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); |
| 449 | } |
| 450 | |
| 451 | |
| 452 | |
| 453 | |
| 454 | |
| 455 | /************************************************* |
| 456 | * Set delivery info into all active addresses * |
| 457 | *************************************************/ |
| 458 | |
| 459 | /* Only addresses whose status is >= PENDING are relevant. A lesser |
| 460 | status means that an address is not currently being processed. |
| 461 | |
| 462 | Arguments: |
| 463 | addrlist points to a chain of addresses |
| 464 | errno_value to put in each address's errno field |
| 465 | msg to put in each address's message field |
| 466 | rc to put in each address's transport_return field |
| 467 | pass_message if TRUE, set the "pass message" flag in the address |
| 468 | host if set, mark addrs as having used this host |
| 469 | smtp_greeting from peer |
| 470 | helo_response from peer |
| 471 | start points to timestamp of delivery start |
| 472 | |
| 473 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in |
| 474 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate |
| 475 | this particular type of timeout. |
| 476 | |
| 477 | Returns: nothing |
| 478 | */ |
| 479 | |
| 480 | static void |
| 481 | set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc, |
| 482 | BOOL pass_message, host_item * host, |
| 483 | #ifdef EXPERIMENTAL_DSN_INFO |
| 484 | const uschar * smtp_greeting, const uschar * helo_response, |
| 485 | #endif |
| 486 | struct timeval * start |
| 487 | ) |
| 488 | { |
| 489 | int orvalue = 0; |
| 490 | struct timeval deliver_time; |
| 491 | |
| 492 | if (errno_value == ERRNO_CONNECTTIMEOUT) |
| 493 | { |
| 494 | errno_value = ETIMEDOUT; |
| 495 | orvalue = RTEF_CTOUT; |
| 496 | } |
| 497 | timesince(&deliver_time, start); |
| 498 | |
| 499 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 500 | if (addr->transport_return >= PENDING) |
| 501 | { |
| 502 | addr->basic_errno = errno_value; |
| 503 | addr->more_errno |= orvalue; |
| 504 | addr->delivery_time = deliver_time; |
| 505 | if (msg) |
| 506 | { |
| 507 | addr->message = msg; |
| 508 | if (pass_message) setflag(addr, af_pass_message); |
| 509 | } |
| 510 | addr->transport_return = rc; |
| 511 | if (host) |
| 512 | { |
| 513 | addr->host_used = host; |
| 514 | #ifdef EXPERIMENTAL_DSN_INFO |
| 515 | if (smtp_greeting) |
| 516 | {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';} |
| 517 | addr->smtp_greeting = smtp_greeting; |
| 518 | |
| 519 | if (helo_response) |
| 520 | {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';} |
| 521 | addr->helo_response = helo_response; |
| 522 | #endif |
| 523 | } |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | static void |
| 528 | set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc, |
| 529 | BOOL pass_message, struct timeval * start) |
| 530 | { |
| 531 | set_errno(addrlist, errno_value, msg, rc, pass_message, NULL, |
| 532 | #ifdef EXPERIMENTAL_DSN_INFO |
| 533 | NULL, NULL, |
| 534 | #endif |
| 535 | start); |
| 536 | } |
| 537 | |
| 538 | |
| 539 | /************************************************* |
| 540 | * Check an SMTP response * |
| 541 | *************************************************/ |
| 542 | |
| 543 | /* This function is given an errno code and the SMTP response buffer |
| 544 | to analyse, together with the host identification for generating messages. It |
| 545 | sets an appropriate message and puts the first digit of the response code into |
| 546 | the yield variable. If no response was actually read, a suitable digit is |
| 547 | chosen. |
| 548 | |
| 549 | Arguments: |
| 550 | host the current host, to get its name for messages |
| 551 | errno_value pointer to the errno value |
| 552 | more_errno from the top address for use with ERRNO_FILTER_FAIL |
| 553 | buffer the SMTP response buffer |
| 554 | yield where to put a one-digit SMTP response code |
| 555 | message where to put an error message |
| 556 | pass_message set TRUE if message is an SMTP response |
| 557 | |
| 558 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE |
| 559 | */ |
| 560 | |
| 561 | static BOOL |
| 562 | check_response(host_item *host, int *errno_value, int more_errno, |
| 563 | uschar *buffer, int *yield, uschar **message, BOOL *pass_message) |
| 564 | { |
| 565 | uschar * pl = pipelining_active ? US"pipelined " : US""; |
| 566 | const uschar * s; |
| 567 | |
| 568 | *yield = '4'; /* Default setting is to give a temporary error */ |
| 569 | |
| 570 | switch(*errno_value) |
| 571 | { |
| 572 | case ETIMEDOUT: /* Handle response timeout */ |
| 573 | *message = US string_sprintf("SMTP timeout after %s%s", |
| 574 | pl, smtp_command); |
| 575 | if (transport_count > 0) |
| 576 | *message = US string_sprintf("%s (%d bytes written)", *message, |
| 577 | transport_count); |
| 578 | return FALSE; |
| 579 | |
| 580 | case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */ |
| 581 | s = string_printing(buffer); |
| 582 | while (isspace(*s)) s++; |
| 583 | *message = *s == 0 |
| 584 | ? string_sprintf("Malformed SMTP reply (an empty line) " |
| 585 | "in response to %s%s", pl, smtp_command) |
| 586 | : string_sprintf("Malformed SMTP reply in response to %s%s: %s", |
| 587 | pl, smtp_command, s); |
| 588 | return FALSE; |
| 589 | |
| 590 | case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with |
| 591 | GnuTLS and TLS1.3 */ |
| 592 | *message = US"bad first read from TLS conn"; |
| 593 | return TRUE; |
| 594 | |
| 595 | case ERRNO_FILTER_FAIL: /* Handle a failed filter process error; |
| 596 | can't send QUIT as we mustn't end the DATA. */ |
| 597 | *message = string_sprintf("transport filter process failed (%d)%s", |
| 598 | more_errno, |
| 599 | more_errno == EX_EXECFAILED ? ": unable to execute command" : ""); |
| 600 | return FALSE; |
| 601 | |
| 602 | case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion; |
| 603 | can't send QUIT as we mustn't end the DATA. */ |
| 604 | *message = |
| 605 | string_sprintf("failed to expand headers_add or headers_remove: %s", |
| 606 | expand_string_message); |
| 607 | return FALSE; |
| 608 | |
| 609 | case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */ |
| 610 | *message = US"failed to write a data block"; |
| 611 | return FALSE; |
| 612 | |
| 613 | #ifdef SUPPORT_I18N |
| 614 | case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */ |
| 615 | *message = US"utf8 support required but not offered for forwarding"; |
| 616 | DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message); |
| 617 | return TRUE; |
| 618 | #endif |
| 619 | } |
| 620 | |
| 621 | /* Handle error responses from the remote mailer. */ |
| 622 | |
| 623 | if (buffer[0] != 0) |
| 624 | { |
| 625 | *message = string_sprintf("SMTP error from remote mail server after %s%s: " |
| 626 | "%s", pl, smtp_command, s = string_printing(buffer)); |
| 627 | *pass_message = TRUE; |
| 628 | *yield = buffer[0]; |
| 629 | return TRUE; |
| 630 | } |
| 631 | |
| 632 | /* No data was read. If there is no errno, this must be the EOF (i.e. |
| 633 | connection closed) case, which causes deferral. An explicit connection reset |
| 634 | error has the same effect. Otherwise, put the host's identity in the message, |
| 635 | leaving the errno value to be interpreted as well. In all cases, we have to |
| 636 | assume the connection is now dead. */ |
| 637 | |
| 638 | if (*errno_value == 0 || *errno_value == ECONNRESET) |
| 639 | { |
| 640 | *errno_value = ERRNO_SMTPCLOSED; |
| 641 | *message = US string_sprintf("Remote host closed connection " |
| 642 | "in response to %s%s", pl, smtp_command); |
| 643 | } |
| 644 | else |
| 645 | *message = US string_sprintf("%s [%s]", host->name, host->address); |
| 646 | |
| 647 | return FALSE; |
| 648 | } |
| 649 | |
| 650 | |
| 651 | |
| 652 | /************************************************* |
| 653 | * Write error message to logs * |
| 654 | *************************************************/ |
| 655 | |
| 656 | /* This writes to the main log and to the message log. |
| 657 | |
| 658 | Arguments: |
| 659 | host the current host |
| 660 | detail the current message (addr_item->message) |
| 661 | basic_errno the errno (addr_item->basic_errno) |
| 662 | |
| 663 | Returns: nothing |
| 664 | */ |
| 665 | |
| 666 | static void |
| 667 | write_logs(const host_item *host, const uschar *suffix, int basic_errno) |
| 668 | { |
| 669 | gstring * message = LOGGING(outgoing_port) |
| 670 | ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address, |
| 671 | host->port == PORT_NONE ? 25 : host->port) |
| 672 | : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address); |
| 673 | |
| 674 | if (suffix) |
| 675 | { |
| 676 | message = string_fmt_append(message, ": %s", suffix); |
| 677 | if (basic_errno > 0) |
| 678 | message = string_fmt_append(message, ": %s", strerror(basic_errno)); |
| 679 | } |
| 680 | else |
| 681 | message = string_fmt_append(message, " %s", exim_errstr(basic_errno)); |
| 682 | |
| 683 | log_write(0, LOG_MAIN, "%s", string_from_gstring(message)); |
| 684 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s); |
| 685 | } |
| 686 | |
| 687 | static void |
| 688 | msglog_line(host_item * host, uschar * message) |
| 689 | { |
| 690 | deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log), |
| 691 | host->name, host->address, message); |
| 692 | } |
| 693 | |
| 694 | |
| 695 | |
| 696 | #ifndef DISABLE_EVENT |
| 697 | /************************************************* |
| 698 | * Post-defer action * |
| 699 | *************************************************/ |
| 700 | |
| 701 | /* This expands an arbitrary per-transport string. |
| 702 | It might, for example, be used to write to the database log. |
| 703 | |
| 704 | Arguments: |
| 705 | addr the address item containing error information |
| 706 | host the current host |
| 707 | evstr the event |
| 708 | |
| 709 | Returns: nothing |
| 710 | */ |
| 711 | |
| 712 | static void |
| 713 | deferred_event_raise(address_item * addr, host_item * host, uschar * evstr) |
| 714 | { |
| 715 | uschar * action = addr->transport->event_action; |
| 716 | const uschar * save_domain; |
| 717 | uschar * save_local; |
| 718 | |
| 719 | if (!action) |
| 720 | return; |
| 721 | |
| 722 | save_domain = deliver_domain; |
| 723 | save_local = deliver_localpart; |
| 724 | |
| 725 | /*XXX would ip & port already be set up? */ |
| 726 | deliver_host_address = string_copy(host->address); |
| 727 | deliver_host_port = host->port == PORT_NONE ? 25 : host->port; |
| 728 | event_defer_errno = addr->basic_errno; |
| 729 | |
| 730 | router_name = addr->router->name; |
| 731 | transport_name = addr->transport->name; |
| 732 | deliver_domain = addr->domain; |
| 733 | deliver_localpart = addr->local_part; |
| 734 | |
| 735 | (void) event_raise(action, evstr, |
| 736 | addr->message |
| 737 | ? addr->basic_errno > 0 |
| 738 | ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno)) |
| 739 | : string_copy(addr->message) |
| 740 | : addr->basic_errno > 0 |
| 741 | ? string_copy(US strerror(addr->basic_errno)) |
| 742 | : NULL); |
| 743 | |
| 744 | deliver_localpart = save_local; |
| 745 | deliver_domain = save_domain; |
| 746 | router_name = transport_name = NULL; |
| 747 | } |
| 748 | #endif |
| 749 | |
| 750 | /************************************************* |
| 751 | * Reap SMTP specific responses * |
| 752 | *************************************************/ |
| 753 | static int |
| 754 | smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob, |
| 755 | int count) |
| 756 | { |
| 757 | uschar flushbuffer[4096]; |
| 758 | |
| 759 | while (count-- > 0) |
| 760 | { |
| 761 | if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer), |
| 762 | '2', ob->command_timeout) |
| 763 | && (errno != 0 || flushbuffer[0] == 0)) |
| 764 | break; |
| 765 | } |
| 766 | return count; |
| 767 | } |
| 768 | |
| 769 | |
| 770 | /* Return boolean success */ |
| 771 | |
| 772 | static BOOL |
| 773 | smtp_reap_banner(smtp_context * sx) |
| 774 | { |
| 775 | BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), |
| 776 | '2', (SOB sx->conn_args.ob)->command_timeout); |
| 777 | #ifdef EXPERIMENTAL_DSN_INFO |
| 778 | sx->smtp_greeting = string_copy(sx->buffer); |
| 779 | #endif |
| 780 | return good_response; |
| 781 | } |
| 782 | |
| 783 | static BOOL |
| 784 | smtp_reap_ehlo(smtp_context * sx) |
| 785 | { |
| 786 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', |
| 787 | (SOB sx->conn_args.ob)->command_timeout)) |
| 788 | { |
| 789 | if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp) |
| 790 | { |
| 791 | #ifdef EXPERIMENTAL_DSN_INFO |
| 792 | sx->helo_response = string_copy(sx->buffer); |
| 793 | #endif |
| 794 | return FALSE; |
| 795 | } |
| 796 | sx->esmtp = FALSE; |
| 797 | } |
| 798 | #ifdef EXPERIMENTAL_DSN_INFO |
| 799 | sx->helo_response = string_copy(sx->buffer); |
| 800 | #endif |
| 801 | #ifndef DISABLE_EVENT |
| 802 | (void) event_raise(sx->conn_args.tblock->event_action, |
| 803 | US"smtp:ehlo", sx->buffer); |
| 804 | #endif |
| 805 | return TRUE; |
| 806 | } |
| 807 | |
| 808 | |
| 809 | |
| 810 | #ifndef DISABLE_PIPE_CONNECT |
| 811 | static uschar * |
| 812 | ehlo_cache_key(const smtp_context * sx) |
| 813 | { |
| 814 | host_item * host = sx->conn_args.host; |
| 815 | return Ustrchr(host->address, ':') |
| 816 | ? string_sprintf("[%s]:%d.EHLO", host->address, |
| 817 | host->port == PORT_NONE ? sx->port : host->port) |
| 818 | : string_sprintf("%s:%d.EHLO", host->address, |
| 819 | host->port == PORT_NONE ? sx->port : host->port); |
| 820 | } |
| 821 | |
| 822 | static void |
| 823 | write_ehlo_cache_entry(const smtp_context * sx) |
| 824 | { |
| 825 | open_db dbblock, * dbm_file; |
| 826 | |
| 827 | if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE))) |
| 828 | { |
| 829 | uschar * ehlo_resp_key = ehlo_cache_key(sx); |
| 830 | dbdata_ehlo_resp er = { .data = sx->ehlo_resp }; |
| 831 | |
| 832 | HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n", |
| 833 | sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths, |
| 834 | sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths); |
| 835 | |
| 836 | dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er)); |
| 837 | dbfn_close(dbm_file); |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | static void |
| 842 | invalidate_ehlo_cache_entry(smtp_context * sx) |
| 843 | { |
| 844 | open_db dbblock, * dbm_file; |
| 845 | |
| 846 | if ( sx->early_pipe_active |
| 847 | && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE))) |
| 848 | { |
| 849 | uschar * ehlo_resp_key = ehlo_cache_key(sx); |
| 850 | dbfn_delete(dbm_file, ehlo_resp_key); |
| 851 | dbfn_close(dbm_file); |
| 852 | } |
| 853 | } |
| 854 | |
| 855 | static BOOL |
| 856 | read_ehlo_cache_entry(smtp_context * sx) |
| 857 | { |
| 858 | open_db dbblock; |
| 859 | open_db * dbm_file; |
| 860 | |
| 861 | if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE))) |
| 862 | { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); } |
| 863 | else |
| 864 | { |
| 865 | uschar * ehlo_resp_key = ehlo_cache_key(sx); |
| 866 | dbdata_ehlo_resp * er; |
| 867 | |
| 868 | if (!(er = dbfn_read(dbm_file, ehlo_resp_key))) |
| 869 | { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); } |
| 870 | else if (time(NULL) - er->time_stamp > retry_data_expire) |
| 871 | { |
| 872 | DEBUG(D_transport) debug_printf("ehlo-resp record too old\n"); |
| 873 | dbfn_close(dbm_file); |
| 874 | if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE))) |
| 875 | dbfn_delete(dbm_file, ehlo_resp_key); |
| 876 | } |
| 877 | else |
| 878 | { |
| 879 | sx->ehlo_resp = er->data; |
| 880 | dbfn_close(dbm_file); |
| 881 | DEBUG(D_transport) debug_printf( |
| 882 | "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n", |
| 883 | er->data.cleartext_features, er->data.cleartext_auths, |
| 884 | er->data.crypted_features, er->data.crypted_auths); |
| 885 | return TRUE; |
| 886 | } |
| 887 | dbfn_close(dbm_file); |
| 888 | } |
| 889 | return FALSE; |
| 890 | } |
| 891 | |
| 892 | |
| 893 | |
| 894 | /* Return an auths bitmap for the set of AUTH methods offered by the server |
| 895 | which match our authenticators. */ |
| 896 | |
| 897 | static unsigned short |
| 898 | study_ehlo_auths(smtp_context * sx) |
| 899 | { |
| 900 | uschar * names; |
| 901 | auth_instance * au; |
| 902 | uschar authnum; |
| 903 | unsigned short authbits = 0; |
| 904 | |
| 905 | if (!sx->esmtp) return 0; |
| 906 | if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE); |
| 907 | if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0; |
| 908 | expand_nmax = -1; /* reset */ |
| 909 | names = string_copyn(expand_nstring[1], expand_nlength[1]); |
| 910 | |
| 911 | for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client) |
| 912 | { |
| 913 | const uschar * list = names; |
| 914 | uschar * s; |
| 915 | for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); ) |
| 916 | if (strcmpic(au->public_name, s) == 0) |
| 917 | { authbits |= BIT(authnum); break; } |
| 918 | } |
| 919 | |
| 920 | DEBUG(D_transport) |
| 921 | debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n", |
| 922 | tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits); |
| 923 | |
| 924 | if (tls_out.active.sock >= 0) |
| 925 | sx->ehlo_resp.crypted_auths = authbits; |
| 926 | else |
| 927 | sx->ehlo_resp.cleartext_auths = authbits; |
| 928 | return authbits; |
| 929 | } |
| 930 | |
| 931 | |
| 932 | |
| 933 | |
| 934 | /* Wait for and check responses for early-pipelining. |
| 935 | |
| 936 | Called from the lower-level smtp_read_response() function |
| 937 | used for general code that assume synchronisation, if context |
| 938 | flags indicate outstanding early-pipelining commands. Also |
| 939 | called fom sync_responses() which handles pipelined commands. |
| 940 | |
| 941 | Arguments: |
| 942 | sx smtp connection context |
| 943 | countp number of outstanding responses, adjusted on return |
| 944 | |
| 945 | Return: |
| 946 | OK all well |
| 947 | DEFER error on first read of TLS'd conn |
| 948 | FAIL SMTP error in response |
| 949 | */ |
| 950 | int |
| 951 | smtp_reap_early_pipe(smtp_context * sx, int * countp) |
| 952 | { |
| 953 | BOOL pending_BANNER = sx->pending_BANNER; |
| 954 | BOOL pending_EHLO = sx->pending_EHLO; |
| 955 | int rc = FAIL; |
| 956 | |
| 957 | sx->pending_BANNER = FALSE; /* clear early to avoid recursion */ |
| 958 | sx->pending_EHLO = FALSE; |
| 959 | |
| 960 | if (pending_BANNER) |
| 961 | { |
| 962 | DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__); |
| 963 | (*countp)--; |
| 964 | if (!smtp_reap_banner(sx)) |
| 965 | { |
| 966 | DEBUG(D_transport) debug_printf("bad banner\n"); |
| 967 | if (tls_out.active.sock >= 0) rc = DEFER; |
| 968 | goto fail; |
| 969 | } |
| 970 | } |
| 971 | |
| 972 | if (pending_EHLO) |
| 973 | { |
| 974 | unsigned peer_offered; |
| 975 | unsigned short authbits = 0, * ap; |
| 976 | |
| 977 | DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__); |
| 978 | (*countp)--; |
| 979 | if (!smtp_reap_ehlo(sx)) |
| 980 | { |
| 981 | DEBUG(D_transport) debug_printf("bad response for EHLO\n"); |
| 982 | if (tls_out.active.sock >= 0) rc = DEFER; |
| 983 | goto fail; |
| 984 | } |
| 985 | |
| 986 | /* Compare the actual EHLO response to the cached value we assumed; |
| 987 | on difference, dump or rewrite the cache and arrange for a retry. */ |
| 988 | |
| 989 | ap = tls_out.active.sock < 0 |
| 990 | ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths; |
| 991 | |
| 992 | peer_offered = ehlo_response(sx->buffer, |
| 993 | (tls_out.active.sock < 0 ? OPTION_TLS : 0) |
| 994 | | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE |
| 995 | | OPTION_UTF8 | OPTION_EARLY_PIPE |
| 996 | ); |
| 997 | if ( peer_offered != sx->peer_offered |
| 998 | || (authbits = study_ehlo_auths(sx)) != *ap) |
| 999 | { |
| 1000 | HDEBUG(D_transport) |
| 1001 | debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n", |
| 1002 | tls_out.active.sock < 0 ? "cleartext" : "crypted", |
| 1003 | sx->peer_offered, *ap, peer_offered, authbits); |
| 1004 | *(tls_out.active.sock < 0 |
| 1005 | ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered; |
| 1006 | *ap = authbits; |
| 1007 | if (peer_offered & OPTION_EARLY_PIPE) |
| 1008 | write_ehlo_cache_entry(sx); |
| 1009 | else |
| 1010 | invalidate_ehlo_cache_entry(sx); |
| 1011 | |
| 1012 | return OK; /* just carry on */ |
| 1013 | } |
| 1014 | } |
| 1015 | return OK; |
| 1016 | |
| 1017 | fail: |
| 1018 | invalidate_ehlo_cache_entry(sx); |
| 1019 | (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp); |
| 1020 | return rc; |
| 1021 | } |
| 1022 | #endif |
| 1023 | |
| 1024 | |
| 1025 | /************************************************* |
| 1026 | * Synchronize SMTP responses * |
| 1027 | *************************************************/ |
| 1028 | |
| 1029 | /* This function is called from smtp_deliver() to receive SMTP responses from |
| 1030 | the server, and match them up with the commands to which they relate. When |
| 1031 | PIPELINING is not in use, this function is called after every command, and is |
| 1032 | therefore somewhat over-engineered, but it is simpler to use a single scheme |
| 1033 | that works both with and without PIPELINING instead of having two separate sets |
| 1034 | of code. |
| 1035 | |
| 1036 | The set of commands that are buffered up with pipelining may start with MAIL |
| 1037 | and may end with DATA; in between are RCPT commands that correspond to the |
| 1038 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, |
| 1039 | etc.) are never buffered. |
| 1040 | |
| 1041 | Errors after MAIL or DATA abort the whole process leaving the response in the |
| 1042 | buffer. After MAIL, pending responses are flushed, and the original command is |
| 1043 | re-instated in big_buffer for error messages. For RCPT commands, the remote is |
| 1044 | permitted to reject some recipient addresses while accepting others. However |
| 1045 | certain errors clearly abort the whole process. Set the value in |
| 1046 | transport_return to PENDING_OK if the address is accepted. If there is a |
| 1047 | subsequent general error, it will get reset accordingly. If not, it will get |
| 1048 | converted to OK at the end. |
| 1049 | |
| 1050 | Arguments: |
| 1051 | sx smtp connection context |
| 1052 | count the number of responses to read |
| 1053 | pending_DATA 0 if last command sent was not DATA |
| 1054 | +1 if previously had a good recipient |
| 1055 | -1 if not previously had a good recipient |
| 1056 | |
| 1057 | Returns: 3 if at least one address had 2xx and one had 5xx |
| 1058 | 2 if at least one address had 5xx but none had 2xx |
| 1059 | 1 if at least one host had a 2xx response, but none had 5xx |
| 1060 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) |
| 1061 | -1 timeout while reading RCPT response |
| 1062 | -2 I/O or other non-response error for RCPT |
| 1063 | -3 DATA or MAIL failed - errno and buffer set |
| 1064 | -4 banner or EHLO failed (early-pipelining) |
| 1065 | -5 banner or EHLO failed (early-pipelining, TLS) |
| 1066 | */ |
| 1067 | |
| 1068 | static int |
| 1069 | sync_responses(smtp_context * sx, int count, int pending_DATA) |
| 1070 | { |
| 1071 | address_item * addr = sx->sync_addr; |
| 1072 | smtp_transport_options_block * ob = sx->conn_args.ob; |
| 1073 | int yield = 0; |
| 1074 | |
| 1075 | #ifndef DISABLE_PIPE_CONNECT |
| 1076 | int rc; |
| 1077 | if ((rc = smtp_reap_early_pipe(sx, &count)) != OK) |
| 1078 | return rc == FAIL ? -4 : -5; |
| 1079 | #endif |
| 1080 | |
| 1081 | /* Handle the response for a MAIL command. On error, reinstate the original |
| 1082 | command in big_buffer for error message use, and flush any further pending |
| 1083 | responses before returning, except after I/O errors and timeouts. */ |
| 1084 | |
| 1085 | if (sx->pending_MAIL) |
| 1086 | { |
| 1087 | DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__); |
| 1088 | count--; |
| 1089 | sx->pending_MAIL = FALSE; |
| 1090 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), |
| 1091 | '2', ob->command_timeout)) |
| 1092 | { |
| 1093 | DEBUG(D_transport) debug_printf("bad response for MAIL\n"); |
| 1094 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ |
| 1095 | if (errno == ERRNO_TLSFAILURE) |
| 1096 | return -5; |
| 1097 | if (errno == 0 && sx->buffer[0] != 0) |
| 1098 | { |
| 1099 | int save_errno = 0; |
| 1100 | if (sx->buffer[0] == '4') |
| 1101 | { |
| 1102 | save_errno = ERRNO_MAIL4XX; |
| 1103 | addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 1104 | } |
| 1105 | count = smtp_discard_responses(sx, ob, count); |
| 1106 | errno = save_errno; |
| 1107 | } |
| 1108 | |
| 1109 | if (pending_DATA) count--; /* Number of RCPT responses to come */ |
| 1110 | while (count-- > 0) /* Mark any pending addrs with the host used */ |
| 1111 | { |
| 1112 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; |
| 1113 | addr->host_used = sx->conn_args.host; |
| 1114 | addr = addr->next; |
| 1115 | } |
| 1116 | return -3; |
| 1117 | } |
| 1118 | } |
| 1119 | |
| 1120 | if (pending_DATA) count--; /* Number of RCPT responses to come */ |
| 1121 | |
| 1122 | /* Read and handle the required number of RCPT responses, matching each one up |
| 1123 | with an address by scanning for the next address whose status is PENDING_DEFER. |
| 1124 | */ |
| 1125 | |
| 1126 | while (count-- > 0) |
| 1127 | { |
| 1128 | while (addr->transport_return != PENDING_DEFER) |
| 1129 | if (!(addr = addr->next)) |
| 1130 | return -2; |
| 1131 | |
| 1132 | /* The address was accepted */ |
| 1133 | addr->host_used = sx->conn_args.host; |
| 1134 | |
| 1135 | DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__); |
| 1136 | if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), |
| 1137 | '2', ob->command_timeout)) |
| 1138 | { |
| 1139 | yield |= 1; |
| 1140 | addr->transport_return = PENDING_OK; |
| 1141 | |
| 1142 | /* If af_dr_retry_exists is set, there was a routing delay on this address; |
| 1143 | ensure that any address-specific retry record is expunged. We do this both |
| 1144 | for the basic key and for the version that also includes the sender. */ |
| 1145 | |
| 1146 | if (testflag(addr, af_dr_retry_exists)) |
| 1147 | { |
| 1148 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, |
| 1149 | sender_address); |
| 1150 | retry_add_item(addr, altkey, rf_delete); |
| 1151 | retry_add_item(addr, addr->address_retry_key, rf_delete); |
| 1152 | } |
| 1153 | } |
| 1154 | |
| 1155 | /* Error on first TLS read */ |
| 1156 | |
| 1157 | else if (errno == ERRNO_TLSFAILURE) |
| 1158 | return -5; |
| 1159 | |
| 1160 | /* Timeout while reading the response */ |
| 1161 | |
| 1162 | else if (errno == ETIMEDOUT) |
| 1163 | { |
| 1164 | uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>", |
| 1165 | transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes)); |
| 1166 | set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start); |
| 1167 | retry_add_item(addr, addr->address_retry_key, 0); |
| 1168 | update_waiting = FALSE; |
| 1169 | return -1; |
| 1170 | } |
| 1171 | |
| 1172 | /* Handle other errors in obtaining an SMTP response by returning -1. This |
| 1173 | will cause all the addresses to be deferred. Restore the SMTP command in |
| 1174 | big_buffer for which we are checking the response, so the error message |
| 1175 | makes sense. */ |
| 1176 | |
| 1177 | else if (errno != 0 || sx->buffer[0] == 0) |
| 1178 | { |
| 1179 | gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs; |
| 1180 | |
| 1181 | /* Use taint-unchecked routines for writing into big_buffer, trusting |
| 1182 | that we'll never expand it. */ |
| 1183 | |
| 1184 | g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>", |
| 1185 | transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes)); |
| 1186 | string_from_gstring(g); |
| 1187 | return -2; |
| 1188 | } |
| 1189 | |
| 1190 | /* Handle SMTP permanent and temporary response codes. */ |
| 1191 | |
| 1192 | else |
| 1193 | { |
| 1194 | addr->message = |
| 1195 | string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: " |
| 1196 | "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes), |
| 1197 | string_printing(sx->buffer)); |
| 1198 | setflag(addr, af_pass_message); |
| 1199 | if (!sx->verify) |
| 1200 | msglog_line(sx->conn_args.host, addr->message); |
| 1201 | |
| 1202 | /* The response was 5xx */ |
| 1203 | |
| 1204 | if (sx->buffer[0] == '5') |
| 1205 | { |
| 1206 | addr->transport_return = FAIL; |
| 1207 | yield |= 2; |
| 1208 | } |
| 1209 | |
| 1210 | /* The response was 4xx */ |
| 1211 | |
| 1212 | else |
| 1213 | { |
| 1214 | addr->transport_return = DEFER; |
| 1215 | addr->basic_errno = ERRNO_RCPT4XX; |
| 1216 | addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 1217 | |
| 1218 | if (!sx->verify) |
| 1219 | { |
| 1220 | #ifndef DISABLE_EVENT |
| 1221 | event_defer_errno = addr->more_errno; |
| 1222 | msg_event_raise(US"msg:rcpt:host:defer", addr); |
| 1223 | #endif |
| 1224 | /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the |
| 1225 | start point for another MAIL command. */ |
| 1226 | |
| 1227 | if (addr->more_errno >> 8 == 52 && yield & 3) |
| 1228 | { |
| 1229 | if (!sx->RCPT_452) |
| 1230 | { |
| 1231 | DEBUG(D_transport) |
| 1232 | debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__); |
| 1233 | sx->RCPT_452 = TRUE; |
| 1234 | sx->next_addr = addr; |
| 1235 | } |
| 1236 | addr->transport_return = PENDING_DEFER; |
| 1237 | addr->basic_errno = 0; |
| 1238 | } |
| 1239 | else |
| 1240 | { |
| 1241 | /* Log temporary errors if there are more hosts to be tried. |
| 1242 | If not, log this last one in the == line. */ |
| 1243 | |
| 1244 | if (sx->conn_args.host->next) |
| 1245 | if (LOGGING(outgoing_port)) |
| 1246 | log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name, |
| 1247 | sx->conn_args.host->address, |
| 1248 | sx->port == PORT_NONE ? 25 : sx->port, addr->message); |
| 1249 | else |
| 1250 | log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name, |
| 1251 | sx->conn_args.host->address, addr->message); |
| 1252 | |
| 1253 | #ifndef DISABLE_EVENT |
| 1254 | else |
| 1255 | msg_event_raise(US"msg:rcpt:defer", addr); |
| 1256 | #endif |
| 1257 | |
| 1258 | /* Do not put this message on the list of those waiting for specific |
| 1259 | hosts, as otherwise it is likely to be tried too often. */ |
| 1260 | |
| 1261 | update_waiting = FALSE; |
| 1262 | |
| 1263 | /* Add a retry item for the address so that it doesn't get tried again |
| 1264 | too soon. If address_retry_include_sender is true, add the sender address |
| 1265 | to the retry key. */ |
| 1266 | |
| 1267 | retry_add_item(addr, |
| 1268 | ob->address_retry_include_sender |
| 1269 | ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address) |
| 1270 | : addr->address_retry_key, |
| 1271 | 0); |
| 1272 | } |
| 1273 | } |
| 1274 | } |
| 1275 | } |
| 1276 | } /* Loop for next RCPT response */ |
| 1277 | |
| 1278 | /* Update where to start at for the next block of responses, unless we |
| 1279 | have already handled all the addresses. */ |
| 1280 | |
| 1281 | if (addr) sx->sync_addr = addr->next; |
| 1282 | |
| 1283 | /* Handle a response to DATA. If we have not had any good recipients, either |
| 1284 | previously or in this block, the response is ignored. */ |
| 1285 | |
| 1286 | if (pending_DATA != 0) |
| 1287 | { |
| 1288 | DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__); |
| 1289 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), |
| 1290 | '3', ob->command_timeout)) |
| 1291 | { |
| 1292 | int code; |
| 1293 | uschar *msg; |
| 1294 | BOOL pass_message; |
| 1295 | |
| 1296 | if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */ |
| 1297 | return -5; |
| 1298 | |
| 1299 | if (pending_DATA > 0 || (yield & 1) != 0) |
| 1300 | { |
| 1301 | if (errno == 0 && sx->buffer[0] == '4') |
| 1302 | { |
| 1303 | errno = ERRNO_DATA4XX; |
| 1304 | sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 1305 | } |
| 1306 | return -3; |
| 1307 | } |
| 1308 | (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message); |
| 1309 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " |
| 1310 | "is in use and there were no good recipients\n", msg); |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if |
| 1315 | present) received 3xx. If any RCPTs were handled and yielded anything other |
| 1316 | than 4xx, yield will be set non-zero. */ |
| 1317 | |
| 1318 | return yield; |
| 1319 | } |
| 1320 | |
| 1321 | |
| 1322 | |
| 1323 | |
| 1324 | |
| 1325 | /* Try an authenticator's client entry */ |
| 1326 | |
| 1327 | static int |
| 1328 | try_authenticator(smtp_context * sx, auth_instance * au) |
| 1329 | { |
| 1330 | smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */ |
| 1331 | host_item * host = sx->conn_args.host; /* host to deliver to */ |
| 1332 | int rc; |
| 1333 | |
| 1334 | sx->outblock.authenticating = TRUE; |
| 1335 | rc = (au->info->clientcode)(au, sx, ob->command_timeout, |
| 1336 | sx->buffer, sizeof(sx->buffer)); |
| 1337 | sx->outblock.authenticating = FALSE; |
| 1338 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc); |
| 1339 | |
| 1340 | /* A temporary authentication failure must hold up delivery to |
| 1341 | this host. After a permanent authentication failure, we carry on |
| 1342 | to try other authentication methods. If all fail hard, try to |
| 1343 | deliver the message unauthenticated unless require_auth was set. */ |
| 1344 | |
| 1345 | switch(rc) |
| 1346 | { |
| 1347 | case OK: |
| 1348 | f.smtp_authenticated = TRUE; /* stops the outer loop */ |
| 1349 | client_authenticator = au->name; |
| 1350 | if (au->set_client_id) |
| 1351 | client_authenticated_id = expand_string(au->set_client_id); |
| 1352 | break; |
| 1353 | |
| 1354 | /* Failure after writing a command */ |
| 1355 | |
| 1356 | case FAIL_SEND: |
| 1357 | return FAIL_SEND; |
| 1358 | |
| 1359 | /* Failure after reading a response */ |
| 1360 | |
| 1361 | case FAIL: |
| 1362 | if (errno != 0 || sx->buffer[0] != '5') return FAIL; |
| 1363 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", |
| 1364 | au->name, host->name, host->address, sx->buffer); |
| 1365 | break; |
| 1366 | |
| 1367 | /* Failure by some other means. In effect, the authenticator |
| 1368 | decided it wasn't prepared to handle this case. Typically this |
| 1369 | is the result of "fail" in an expansion string. Do we need to |
| 1370 | log anything here? Feb 2006: a message is now put in the buffer |
| 1371 | if logging is required. */ |
| 1372 | |
| 1373 | case CANCELLED: |
| 1374 | if (*sx->buffer != 0) |
| 1375 | log_write(0, LOG_MAIN, "%s authenticator cancelled " |
| 1376 | "authentication H=%s [%s] %s", au->name, host->name, |
| 1377 | host->address, sx->buffer); |
| 1378 | break; |
| 1379 | |
| 1380 | /* Internal problem, message in buffer. */ |
| 1381 | |
| 1382 | case ERROR: |
| 1383 | set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer), |
| 1384 | DEFER, FALSE, &sx->delivery_start); |
| 1385 | return ERROR; |
| 1386 | } |
| 1387 | return OK; |
| 1388 | } |
| 1389 | |
| 1390 | |
| 1391 | |
| 1392 | |
| 1393 | /* Do the client side of smtp-level authentication. |
| 1394 | |
| 1395 | Arguments: |
| 1396 | sx smtp connection context |
| 1397 | |
| 1398 | sx->buffer should have the EHLO response from server (gets overwritten) |
| 1399 | |
| 1400 | Returns: |
| 1401 | OK Success, or failed (but not required): global "smtp_authenticated" set |
| 1402 | DEFER Failed authentication (and was required) |
| 1403 | ERROR Internal problem |
| 1404 | |
| 1405 | FAIL_SEND Failed communications - transmit |
| 1406 | FAIL - response |
| 1407 | */ |
| 1408 | |
| 1409 | static int |
| 1410 | smtp_auth(smtp_context * sx) |
| 1411 | { |
| 1412 | host_item * host = sx->conn_args.host; /* host to deliver to */ |
| 1413 | smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */ |
| 1414 | int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host); |
| 1415 | #ifndef DISABLE_PIPE_CONNECT |
| 1416 | unsigned short authbits = tls_out.active.sock >= 0 |
| 1417 | ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths; |
| 1418 | #endif |
| 1419 | uschar * fail_reason = US"server did not advertise AUTH support"; |
| 1420 | |
| 1421 | f.smtp_authenticated = FALSE; |
| 1422 | client_authenticator = client_authenticated_id = client_authenticated_sender = NULL; |
| 1423 | |
| 1424 | if (!regex_AUTH) |
| 1425 | regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE); |
| 1426 | |
| 1427 | /* Is the server offering AUTH? */ |
| 1428 | |
| 1429 | if ( sx->esmtp |
| 1430 | && |
| 1431 | #ifndef DISABLE_PIPE_CONNECT |
| 1432 | sx->early_pipe_active ? authbits |
| 1433 | : |
| 1434 | #endif |
| 1435 | regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1) |
| 1436 | ) |
| 1437 | { |
| 1438 | uschar * names = NULL; |
| 1439 | expand_nmax = -1; /* reset */ |
| 1440 | |
| 1441 | #ifndef DISABLE_PIPE_CONNECT |
| 1442 | if (!sx->early_pipe_active) |
| 1443 | #endif |
| 1444 | names = string_copyn(expand_nstring[1], expand_nlength[1]); |
| 1445 | |
| 1446 | /* Must not do this check until after we have saved the result of the |
| 1447 | regex match above as the check could be another RE. */ |
| 1448 | |
| 1449 | if ( require_auth == OK |
| 1450 | || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK) |
| 1451 | { |
| 1452 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); |
| 1453 | fail_reason = US"no common mechanisms were found"; |
| 1454 | |
| 1455 | #ifndef DISABLE_PIPE_CONNECT |
| 1456 | if (sx->early_pipe_active) |
| 1457 | { |
| 1458 | /* Scan our authenticators (which support use by a client and were offered |
| 1459 | by the server (checked at cache-write time)), not suppressed by |
| 1460 | client_condition. If one is found, attempt to authenticate by calling its |
| 1461 | client function. We are limited to supporting up to 16 authenticator |
| 1462 | public-names by the number of bits in a short. */ |
| 1463 | |
| 1464 | auth_instance * au; |
| 1465 | uschar bitnum; |
| 1466 | int rc; |
| 1467 | |
| 1468 | for (bitnum = 0, au = auths; |
| 1469 | !f.smtp_authenticated && au && bitnum < 16; |
| 1470 | bitnum++, au = au->next) if (authbits & BIT(bitnum)) |
| 1471 | { |
| 1472 | if ( au->client_condition |
| 1473 | && !expand_check_condition(au->client_condition, au->name, |
| 1474 | US"client authenticator")) |
| 1475 | { |
| 1476 | DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n", |
| 1477 | au->name, "client_condition is false"); |
| 1478 | continue; |
| 1479 | } |
| 1480 | |
| 1481 | /* Found data for a listed mechanism. Call its client entry. Set |
| 1482 | a flag in the outblock so that data is overwritten after sending so |
| 1483 | that reflections don't show it. */ |
| 1484 | |
| 1485 | fail_reason = US"authentication attempt(s) failed"; |
| 1486 | |
| 1487 | if ((rc = try_authenticator(sx, au)) != OK) |
| 1488 | return rc; |
| 1489 | } |
| 1490 | } |
| 1491 | else |
| 1492 | #endif |
| 1493 | |
| 1494 | /* Scan the configured authenticators looking for one which is configured |
| 1495 | for use as a client, which is not suppressed by client_condition, and |
| 1496 | whose name matches an authentication mechanism supported by the server. |
| 1497 | If one is found, attempt to authenticate by calling its client function. |
| 1498 | */ |
| 1499 | |
| 1500 | for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next) |
| 1501 | { |
| 1502 | uschar *p = names; |
| 1503 | |
| 1504 | if ( !au->client |
| 1505 | || ( au->client_condition |
| 1506 | && !expand_check_condition(au->client_condition, au->name, |
| 1507 | US"client authenticator"))) |
| 1508 | { |
| 1509 | DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n", |
| 1510 | au->name, |
| 1511 | (au->client)? "client_condition is false" : |
| 1512 | "not configured as a client"); |
| 1513 | continue; |
| 1514 | } |
| 1515 | |
| 1516 | /* Loop to scan supported server mechanisms */ |
| 1517 | |
| 1518 | while (*p) |
| 1519 | { |
| 1520 | int len = Ustrlen(au->public_name); |
| 1521 | int rc; |
| 1522 | |
| 1523 | while (isspace(*p)) p++; |
| 1524 | |
| 1525 | if (strncmpic(au->public_name, p, len) != 0 || |
| 1526 | (p[len] != 0 && !isspace(p[len]))) |
| 1527 | { |
| 1528 | while (*p != 0 && !isspace(*p)) p++; |
| 1529 | continue; |
| 1530 | } |
| 1531 | |
| 1532 | /* Found data for a listed mechanism. Call its client entry. Set |
| 1533 | a flag in the outblock so that data is overwritten after sending so |
| 1534 | that reflections don't show it. */ |
| 1535 | |
| 1536 | fail_reason = US"authentication attempt(s) failed"; |
| 1537 | |
| 1538 | if ((rc = try_authenticator(sx, au)) != OK) |
| 1539 | return rc; |
| 1540 | |
| 1541 | break; /* If not authenticated, try next authenticator */ |
| 1542 | } /* Loop for scanning supported server mechanisms */ |
| 1543 | } /* Loop for further authenticators */ |
| 1544 | } |
| 1545 | } |
| 1546 | |
| 1547 | /* If we haven't authenticated, but are required to, give up. */ |
| 1548 | |
| 1549 | if (require_auth == OK && !f.smtp_authenticated) |
| 1550 | { |
| 1551 | set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL, |
| 1552 | string_sprintf("authentication required but %s", fail_reason), DEFER, |
| 1553 | FALSE, &sx->delivery_start); |
| 1554 | return DEFER; |
| 1555 | } |
| 1556 | |
| 1557 | return OK; |
| 1558 | } |
| 1559 | |
| 1560 | |
| 1561 | /* Construct AUTH appendix string for MAIL TO */ |
| 1562 | /* |
| 1563 | Arguments |
| 1564 | sx context for smtp connection |
| 1565 | p point in sx->buffer to build string |
| 1566 | addrlist chain of potential addresses to deliver |
| 1567 | |
| 1568 | Globals f.smtp_authenticated |
| 1569 | client_authenticated_sender |
| 1570 | Return True on error, otherwise buffer has (possibly empty) terminated string |
| 1571 | */ |
| 1572 | |
| 1573 | static BOOL |
| 1574 | smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist) |
| 1575 | { |
| 1576 | smtp_transport_options_block * ob = sx->conn_args.ob; |
| 1577 | uschar * local_authenticated_sender = authenticated_sender; |
| 1578 | |
| 1579 | #ifdef notdef |
| 1580 | debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", |
| 1581 | authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N"); |
| 1582 | #endif |
| 1583 | |
| 1584 | if (ob->authenticated_sender) |
| 1585 | { |
| 1586 | uschar * new = expand_string(ob->authenticated_sender); |
| 1587 | if (!new) |
| 1588 | { |
| 1589 | if (!f.expand_string_forcedfail) |
| 1590 | { |
| 1591 | uschar *message = string_sprintf("failed to expand " |
| 1592 | "authenticated_sender: %s", expand_string_message); |
| 1593 | set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start); |
| 1594 | return TRUE; |
| 1595 | } |
| 1596 | } |
| 1597 | else if (*new) |
| 1598 | local_authenticated_sender = new; |
| 1599 | } |
| 1600 | |
| 1601 | /* Add the authenticated sender address if present */ |
| 1602 | |
| 1603 | if ( (f.smtp_authenticated || ob->authenticated_sender_force) |
| 1604 | && local_authenticated_sender) |
| 1605 | { |
| 1606 | string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s", |
| 1607 | auth_xtextencode(local_authenticated_sender, |
| 1608 | Ustrlen(local_authenticated_sender))); |
| 1609 | client_authenticated_sender = string_copy(local_authenticated_sender); |
| 1610 | } |
| 1611 | else |
| 1612 | *p = 0; |
| 1613 | |
| 1614 | return FALSE; |
| 1615 | } |
| 1616 | |
| 1617 | |
| 1618 | |
| 1619 | typedef struct smtp_compare_s |
| 1620 | { |
| 1621 | uschar *current_sender_address; |
| 1622 | struct transport_instance *tblock; |
| 1623 | } smtp_compare_t; |
| 1624 | |
| 1625 | |
| 1626 | /* Create a unique string that identifies this message, it is based on |
| 1627 | sender_address, helo_data and tls_certificate if enabled. |
| 1628 | */ |
| 1629 | |
| 1630 | static uschar * |
| 1631 | smtp_local_identity(uschar * sender, struct transport_instance * tblock) |
| 1632 | { |
| 1633 | address_item * addr1; |
| 1634 | uschar * if1 = US""; |
| 1635 | uschar * helo1 = US""; |
| 1636 | #ifndef DISABLE_TLS |
| 1637 | uschar * tlsc1 = US""; |
| 1638 | #endif |
| 1639 | uschar * save_sender_address = sender_address; |
| 1640 | uschar * local_identity = NULL; |
| 1641 | smtp_transport_options_block * ob = SOB tblock->options_block; |
| 1642 | |
| 1643 | sender_address = sender; |
| 1644 | |
| 1645 | addr1 = deliver_make_addr (sender, TRUE); |
| 1646 | deliver_set_expansions(addr1); |
| 1647 | |
| 1648 | if (ob->interface) |
| 1649 | if1 = expand_string(ob->interface); |
| 1650 | |
| 1651 | if (ob->helo_data) |
| 1652 | helo1 = expand_string(ob->helo_data); |
| 1653 | |
| 1654 | #ifndef DISABLE_TLS |
| 1655 | if (ob->tls_certificate) |
| 1656 | tlsc1 = expand_string(ob->tls_certificate); |
| 1657 | local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1); |
| 1658 | #else |
| 1659 | local_identity = string_sprintf ("%s^%s", if1, helo1); |
| 1660 | #endif |
| 1661 | |
| 1662 | deliver_set_expansions(NULL); |
| 1663 | sender_address = save_sender_address; |
| 1664 | |
| 1665 | return local_identity; |
| 1666 | } |
| 1667 | |
| 1668 | |
| 1669 | |
| 1670 | /* This routine is a callback that is called from transport_check_waiting. |
| 1671 | This function will evaluate the incoming message versus the previous |
| 1672 | message. If the incoming message is using a different local identity then |
| 1673 | we will veto this new message. */ |
| 1674 | |
| 1675 | static BOOL |
| 1676 | smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare) |
| 1677 | { |
| 1678 | uschar * message_local_identity, |
| 1679 | * current_local_identity, |
| 1680 | * new_sender_address; |
| 1681 | |
| 1682 | current_local_identity = |
| 1683 | smtp_local_identity(s_compare->current_sender_address, s_compare->tblock); |
| 1684 | |
| 1685 | if (!(new_sender_address = deliver_get_sender_address(message_id))) |
| 1686 | return FALSE; |
| 1687 | |
| 1688 | message_local_identity = |
| 1689 | smtp_local_identity(new_sender_address, s_compare->tblock); |
| 1690 | |
| 1691 | return Ustrcmp(current_local_identity, message_local_identity) == 0; |
| 1692 | } |
| 1693 | |
| 1694 | |
| 1695 | |
| 1696 | static unsigned |
| 1697 | ehlo_response(uschar * buf, unsigned checks) |
| 1698 | { |
| 1699 | size_t bsize = Ustrlen(buf); |
| 1700 | |
| 1701 | /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */ |
| 1702 | |
| 1703 | #ifndef DISABLE_TLS |
| 1704 | if ( checks & OPTION_TLS |
| 1705 | && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1706 | #endif |
| 1707 | checks &= ~OPTION_TLS; |
| 1708 | |
| 1709 | if ( checks & OPTION_IGNQ |
| 1710 | && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0, |
| 1711 | PCRE_EOPT, NULL, 0) < 0) |
| 1712 | checks &= ~OPTION_IGNQ; |
| 1713 | |
| 1714 | if ( checks & OPTION_CHUNKING |
| 1715 | && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1716 | checks &= ~OPTION_CHUNKING; |
| 1717 | |
| 1718 | #ifndef DISABLE_PRDR |
| 1719 | if ( checks & OPTION_PRDR |
| 1720 | && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1721 | #endif |
| 1722 | checks &= ~OPTION_PRDR; |
| 1723 | |
| 1724 | #ifdef SUPPORT_I18N |
| 1725 | if ( checks & OPTION_UTF8 |
| 1726 | && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1727 | #endif |
| 1728 | checks &= ~OPTION_UTF8; |
| 1729 | |
| 1730 | if ( checks & OPTION_DSN |
| 1731 | && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1732 | checks &= ~OPTION_DSN; |
| 1733 | |
| 1734 | if ( checks & OPTION_PIPE |
| 1735 | && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0, |
| 1736 | PCRE_EOPT, NULL, 0) < 0) |
| 1737 | checks &= ~OPTION_PIPE; |
| 1738 | |
| 1739 | if ( checks & OPTION_SIZE |
| 1740 | && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0) |
| 1741 | checks &= ~OPTION_SIZE; |
| 1742 | |
| 1743 | #ifndef DISABLE_PIPE_CONNECT |
| 1744 | if ( checks & OPTION_EARLY_PIPE |
| 1745 | && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0, |
| 1746 | PCRE_EOPT, NULL, 0) < 0) |
| 1747 | #endif |
| 1748 | checks &= ~OPTION_EARLY_PIPE; |
| 1749 | |
| 1750 | /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */ |
| 1751 | return checks; |
| 1752 | } |
| 1753 | |
| 1754 | |
| 1755 | |
| 1756 | /* Callback for emitting a BDAT data chunk header. |
| 1757 | |
| 1758 | If given a nonzero size, first flush any buffered SMTP commands |
| 1759 | then emit the command. |
| 1760 | |
| 1761 | Reap previous SMTP command responses if requested, and always reap |
| 1762 | the response from a previous BDAT command. |
| 1763 | |
| 1764 | Args: |
| 1765 | tctx transport context |
| 1766 | chunk_size value for SMTP BDAT command |
| 1767 | flags |
| 1768 | tc_chunk_last add LAST option to SMTP BDAT command |
| 1769 | tc_reap_prev reap response to previous SMTP commands |
| 1770 | |
| 1771 | Returns: |
| 1772 | OK or ERROR |
| 1773 | DEFER TLS error on first read (EHLO-resp); errno set |
| 1774 | */ |
| 1775 | |
| 1776 | static int |
| 1777 | smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size, |
| 1778 | unsigned flags) |
| 1779 | { |
| 1780 | smtp_transport_options_block * ob = SOB tctx->tblock->options_block; |
| 1781 | smtp_context * sx = tctx->smtp_context; |
| 1782 | int cmd_count = 0; |
| 1783 | int prev_cmd_count; |
| 1784 | |
| 1785 | /* Write SMTP chunk header command. If not reaping responses, note that |
| 1786 | there may be more writes (like, the chunk data) done soon. */ |
| 1787 | |
| 1788 | if (chunk_size > 0) |
| 1789 | { |
| 1790 | #ifndef DISABLE_PIPE_CONNECT |
| 1791 | BOOL new_conn = !!(sx->outblock.conn_args); |
| 1792 | #endif |
| 1793 | if((cmd_count = smtp_write_command(sx, |
| 1794 | flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE, |
| 1795 | "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "") |
| 1796 | ) < 0) return ERROR; |
| 1797 | if (flags & tc_chunk_last) |
| 1798 | data_command = string_copy(big_buffer); /* Save for later error message */ |
| 1799 | #ifndef DISABLE_PIPE_CONNECT |
| 1800 | /* That command write could have been the one that made the connection. |
| 1801 | Copy the fd from the client conn ctx (smtp transport specific) to the |
| 1802 | generic transport ctx. */ |
| 1803 | |
| 1804 | if (new_conn) |
| 1805 | tctx->u.fd = sx->outblock.cctx->sock; |
| 1806 | #endif |
| 1807 | } |
| 1808 | |
| 1809 | prev_cmd_count = cmd_count += sx->cmd_count; |
| 1810 | |
| 1811 | /* Reap responses for any previous, but not one we just emitted */ |
| 1812 | |
| 1813 | if (chunk_size > 0) |
| 1814 | prev_cmd_count--; |
| 1815 | if (sx->pending_BDAT) |
| 1816 | prev_cmd_count--; |
| 1817 | |
| 1818 | if (flags & tc_reap_prev && prev_cmd_count > 0) |
| 1819 | { |
| 1820 | DEBUG(D_transport) debug_printf("look for %d responses" |
| 1821 | " for previous pipelined cmds\n", prev_cmd_count); |
| 1822 | |
| 1823 | switch(sync_responses(sx, prev_cmd_count, 0)) |
| 1824 | { |
| 1825 | case 1: /* 2xx (only) => OK */ |
| 1826 | case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 1827 | case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */ |
| 1828 | case 0: break; /* No 2xx or 5xx, but no probs */ |
| 1829 | |
| 1830 | case -5: errno = ERRNO_TLSFAILURE; |
| 1831 | return DEFER; |
| 1832 | #ifndef DISABLE_PIPE_CONNECT |
| 1833 | case -4: /* non-2xx for pipelined banner or EHLO */ |
| 1834 | #endif |
| 1835 | case -1: /* Timeout on RCPT */ |
| 1836 | default: return ERROR; /* I/O error, or any MAIL/DATA error */ |
| 1837 | } |
| 1838 | cmd_count = 1; |
| 1839 | if (!sx->pending_BDAT) |
| 1840 | pipelining_active = FALSE; |
| 1841 | } |
| 1842 | |
| 1843 | /* Reap response for an outstanding BDAT */ |
| 1844 | |
| 1845 | if (sx->pending_BDAT) |
| 1846 | { |
| 1847 | DEBUG(D_transport) debug_printf("look for one response for BDAT\n"); |
| 1848 | |
| 1849 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', |
| 1850 | ob->command_timeout)) |
| 1851 | { |
| 1852 | if (errno == 0 && sx->buffer[0] == '4') |
| 1853 | { |
| 1854 | errno = ERRNO_DATA4XX; /*XXX does this actually get used? */ |
| 1855 | sx->addrlist->more_errno |= |
| 1856 | ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 1857 | } |
| 1858 | return ERROR; |
| 1859 | } |
| 1860 | cmd_count--; |
| 1861 | sx->pending_BDAT = FALSE; |
| 1862 | pipelining_active = FALSE; |
| 1863 | } |
| 1864 | else if (chunk_size > 0) |
| 1865 | sx->pending_BDAT = TRUE; |
| 1866 | |
| 1867 | |
| 1868 | sx->cmd_count = cmd_count; |
| 1869 | return OK; |
| 1870 | } |
| 1871 | |
| 1872 | |
| 1873 | |
| 1874 | |
| 1875 | |
| 1876 | /************************************************* |
| 1877 | * Make connection for given message * |
| 1878 | *************************************************/ |
| 1879 | |
| 1880 | /* |
| 1881 | Arguments: |
| 1882 | ctx connection context |
| 1883 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for |
| 1884 | a second attempt after TLS initialization fails |
| 1885 | |
| 1886 | Returns: OK - the connection was made and the delivery attempted; |
| 1887 | fd is set in the conn context, tls_out set up. |
| 1888 | DEFER - the connection could not be made, or something failed |
| 1889 | while setting up the SMTP session, or there was a |
| 1890 | non-message-specific error, such as a timeout. |
| 1891 | ERROR - helo_data or add_headers or authenticated_sender is |
| 1892 | specified for this transport, and the string failed |
| 1893 | to expand |
| 1894 | */ |
| 1895 | int |
| 1896 | smtp_setup_conn(smtp_context * sx, BOOL suppress_tls) |
| 1897 | { |
| 1898 | smtp_transport_options_block * ob = sx->conn_args.tblock->options_block; |
| 1899 | BOOL pass_message = FALSE; |
| 1900 | uschar * message = NULL; |
| 1901 | int yield = OK; |
| 1902 | #ifndef DISABLE_TLS |
| 1903 | uschar * tls_errstr; |
| 1904 | #endif |
| 1905 | |
| 1906 | sx->conn_args.ob = ob; |
| 1907 | |
| 1908 | sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0; |
| 1909 | sx->smtps = strcmpic(ob->protocol, US"smtps") == 0; |
| 1910 | /* sx->ok = FALSE; */ |
| 1911 | sx->send_rset = TRUE; |
| 1912 | sx->send_quit = TRUE; |
| 1913 | sx->setting_up = TRUE; |
| 1914 | sx->esmtp = TRUE; |
| 1915 | /* sx->esmtp_sent = FALSE; */ |
| 1916 | #ifdef SUPPORT_I18N |
| 1917 | /* sx->utf8_needed = FALSE; */ |
| 1918 | #endif |
| 1919 | sx->dsn_all_lasthop = TRUE; |
| 1920 | #ifdef SUPPORT_DANE |
| 1921 | /* sx->conn_args.dane = FALSE; */ |
| 1922 | sx->dane_required = |
| 1923 | verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK; |
| 1924 | #endif |
| 1925 | #ifndef DISABLE_PIPE_CONNECT |
| 1926 | /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */ |
| 1927 | /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */ |
| 1928 | /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */ |
| 1929 | #endif |
| 1930 | |
| 1931 | if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999; |
| 1932 | /* sx->peer_offered = 0; */ |
| 1933 | /* sx->avoid_option = 0; */ |
| 1934 | sx->igquotstr = US""; |
| 1935 | if (!sx->helo_data) sx->helo_data = ob->helo_data; |
| 1936 | #ifdef EXPERIMENTAL_DSN_INFO |
| 1937 | /* sx->smtp_greeting = NULL; */ |
| 1938 | /* sx->helo_response = NULL; */ |
| 1939 | #endif |
| 1940 | |
| 1941 | smtp_command = US"initial connection"; |
| 1942 | /* sx->buffer[0] = '\0'; */ |
| 1943 | |
| 1944 | /* Set up the buffer for reading SMTP response packets. */ |
| 1945 | |
| 1946 | sx->inblock.buffer = sx->inbuffer; |
| 1947 | sx->inblock.buffersize = sizeof(sx->inbuffer); |
| 1948 | sx->inblock.ptr = sx->inbuffer; |
| 1949 | sx->inblock.ptrend = sx->inbuffer; |
| 1950 | |
| 1951 | /* Set up the buffer for holding SMTP commands while pipelining */ |
| 1952 | |
| 1953 | sx->outblock.buffer = sx->outbuffer; |
| 1954 | sx->outblock.buffersize = sizeof(sx->outbuffer); |
| 1955 | sx->outblock.ptr = sx->outbuffer; |
| 1956 | /* sx->outblock.cmd_count = 0; */ |
| 1957 | /* sx->outblock.authenticating = FALSE; */ |
| 1958 | /* sx->outblock.conn_args = NULL; */ |
| 1959 | |
| 1960 | /* Reset the parameters of a TLS session. */ |
| 1961 | |
| 1962 | tls_out.bits = 0; |
| 1963 | tls_out.cipher = NULL; /* the one we may use for this transport */ |
| 1964 | tls_out.ourcert = NULL; |
| 1965 | tls_out.peercert = NULL; |
| 1966 | tls_out.peerdn = NULL; |
| 1967 | #ifdef USE_OPENSSL |
| 1968 | tls_out.sni = NULL; |
| 1969 | #endif |
| 1970 | tls_out.ocsp = OCSP_NOT_REQ; |
| 1971 | #ifdef EXPERIMENTAL_TLS_RESUME |
| 1972 | tls_out.resumption = 0; |
| 1973 | #endif |
| 1974 | tls_out.ver = NULL; |
| 1975 | |
| 1976 | /* Flip the legacy TLS-related variables over to the outbound set in case |
| 1977 | they're used in the context of the transport. Don't bother resetting |
| 1978 | afterward (when being used by a transport) as we're in a subprocess. |
| 1979 | For verify, unflipped once the callout is dealt with */ |
| 1980 | |
| 1981 | tls_modify_variables(&tls_out); |
| 1982 | |
| 1983 | #ifdef DISABLE_TLS |
| 1984 | if (sx->smtps) |
| 1985 | { |
| 1986 | set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available", |
| 1987 | DEFER, FALSE, &sx->delivery_start); |
| 1988 | return ERROR; |
| 1989 | } |
| 1990 | #endif |
| 1991 | |
| 1992 | /* Make a connection to the host if this isn't a continued delivery, and handle |
| 1993 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled |
| 1994 | specially so they can be identified for retries. */ |
| 1995 | |
| 1996 | if (!continue_hostname) |
| 1997 | { |
| 1998 | if (sx->verify) |
| 1999 | HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port); |
| 2000 | |
| 2001 | /* Get the actual port the connection will use, into sx->conn_args.host */ |
| 2002 | |
| 2003 | smtp_port_for_connect(sx->conn_args.host, sx->port); |
| 2004 | |
| 2005 | #ifdef SUPPORT_DANE |
| 2006 | /* Do TLSA lookup for DANE */ |
| 2007 | { |
| 2008 | tls_out.dane_verified = FALSE; |
| 2009 | tls_out.tlsa_usage = 0; |
| 2010 | |
| 2011 | if (sx->conn_args.host->dnssec == DS_YES) |
| 2012 | { |
| 2013 | int rc; |
| 2014 | if( sx->dane_required |
| 2015 | || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK |
| 2016 | ) |
| 2017 | switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required)) |
| 2018 | { |
| 2019 | case OK: sx->conn_args.dane = TRUE; |
| 2020 | ob->tls_tempfail_tryclear = FALSE; |
| 2021 | break; |
| 2022 | case FAIL_FORCED: break; |
| 2023 | default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER, |
| 2024 | string_sprintf("DANE error: tlsa lookup %s", |
| 2025 | rc_to_string(rc)), |
| 2026 | rc, FALSE, &sx->delivery_start); |
| 2027 | # ifndef DISABLE_EVENT |
| 2028 | (void) event_raise(sx->conn_args.tblock->event_action, |
| 2029 | US"dane:fail", sx->dane_required |
| 2030 | ? US"dane-required" : US"dnssec-invalid"); |
| 2031 | # endif |
| 2032 | return rc; |
| 2033 | } |
| 2034 | } |
| 2035 | else if (sx->dane_required) |
| 2036 | { |
| 2037 | set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER, |
| 2038 | string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name), |
| 2039 | FAIL, FALSE, &sx->delivery_start); |
| 2040 | # ifndef DISABLE_EVENT |
| 2041 | (void) event_raise(sx->conn_args.tblock->event_action, |
| 2042 | US"dane:fail", US"dane-required"); |
| 2043 | # endif |
| 2044 | return FAIL; |
| 2045 | } |
| 2046 | } |
| 2047 | #endif /*DANE*/ |
| 2048 | |
| 2049 | /* Make the TCP connection */ |
| 2050 | |
| 2051 | sx->cctx.tls_ctx = NULL; |
| 2052 | sx->inblock.cctx = sx->outblock.cctx = &sx->cctx; |
| 2053 | sx->avoid_option = sx->peer_offered = smtp_peer_options = 0; |
| 2054 | |
| 2055 | #ifndef DISABLE_PIPE_CONNECT |
| 2056 | if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect, |
| 2057 | sx->conn_args.host) == OK) |
| 2058 | |
| 2059 | /* We don't find out the local ip address until the connect, so if |
| 2060 | the helo string might use it avoid doing early-pipelining. */ |
| 2061 | |
| 2062 | if ( !sx->helo_data |
| 2063 | || !Ustrstr(sx->helo_data, "$sending_ip_address") |
| 2064 | || Ustrstr(sx->helo_data, "def:sending_ip_address") |
| 2065 | ) |
| 2066 | { |
| 2067 | sx->early_pipe_ok = TRUE; |
| 2068 | if ( read_ehlo_cache_entry(sx) |
| 2069 | && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE) |
| 2070 | { |
| 2071 | DEBUG(D_transport) |
| 2072 | debug_printf("Using cached cleartext PIPE_CONNECT\n"); |
| 2073 | sx->early_pipe_active = TRUE; |
| 2074 | sx->peer_offered = sx->ehlo_resp.cleartext_features; |
| 2075 | } |
| 2076 | } |
| 2077 | else DEBUG(D_transport) |
| 2078 | debug_printf("helo needs $sending_ip_address\n"); |
| 2079 | |
| 2080 | PIPE_CONNECT_RETRY: |
| 2081 | if (sx->early_pipe_active) |
| 2082 | sx->outblock.conn_args = &sx->conn_args; |
| 2083 | else |
| 2084 | #endif |
| 2085 | { |
| 2086 | if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0) |
| 2087 | { |
| 2088 | set_errno_nohost(sx->addrlist, |
| 2089 | errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno, |
| 2090 | sx->verify ? US strerror(errno) : NULL, |
| 2091 | DEFER, FALSE, &sx->delivery_start); |
| 2092 | sx->send_quit = FALSE; |
| 2093 | return DEFER; |
| 2094 | } |
| 2095 | } |
| 2096 | /* Expand the greeting message while waiting for the initial response. (Makes |
| 2097 | sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is |
| 2098 | delayed till here so that $sending_interface and $sending_port are set. */ |
| 2099 | /*XXX early-pipe: they still will not be. Is there any way to find out what they |
| 2100 | will be? Somehow I doubt it. */ |
| 2101 | |
| 2102 | if (sx->helo_data) |
| 2103 | if (!(sx->helo_data = expand_string(sx->helo_data))) |
| 2104 | if (sx->verify) |
| 2105 | log_write(0, LOG_MAIN|LOG_PANIC, |
| 2106 | "<%s>: failed to expand transport's helo_data value for callout: %s", |
| 2107 | sx->addrlist->address, expand_string_message); |
| 2108 | |
| 2109 | #ifdef SUPPORT_I18N |
| 2110 | if (sx->helo_data) |
| 2111 | { |
| 2112 | expand_string_message = NULL; |
| 2113 | if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data, |
| 2114 | &expand_string_message)), |
| 2115 | expand_string_message) |
| 2116 | if (sx->verify) |
| 2117 | log_write(0, LOG_MAIN|LOG_PANIC, |
| 2118 | "<%s>: failed to expand transport's helo_data value for callout: %s", |
| 2119 | sx->addrlist->address, expand_string_message); |
| 2120 | else |
| 2121 | sx->helo_data = NULL; |
| 2122 | } |
| 2123 | #endif |
| 2124 | |
| 2125 | /* The first thing is to wait for an initial OK response. The dreaded "goto" |
| 2126 | is nevertheless a reasonably clean way of programming this kind of logic, |
| 2127 | where you want to escape on any error. */ |
| 2128 | |
| 2129 | if (!sx->smtps) |
| 2130 | { |
| 2131 | #ifndef DISABLE_PIPE_CONNECT |
| 2132 | if (sx->early_pipe_active) |
| 2133 | { |
| 2134 | sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */ |
| 2135 | sx->outblock.cmd_count = 1; |
| 2136 | } |
| 2137 | else |
| 2138 | #endif |
| 2139 | { |
| 2140 | #ifdef TCP_QUICKACK |
| 2141 | (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, |
| 2142 | sizeof(off)); |
| 2143 | #endif |
| 2144 | if (!smtp_reap_banner(sx)) |
| 2145 | goto RESPONSE_FAILED; |
| 2146 | } |
| 2147 | |
| 2148 | #ifndef DISABLE_EVENT |
| 2149 | { |
| 2150 | uschar * s; |
| 2151 | lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes" |
| 2152 | : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL; |
| 2153 | s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer); |
| 2154 | if (s) |
| 2155 | { |
| 2156 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, |
| 2157 | string_sprintf("deferred by smtp:connect event expansion: %s", s), |
| 2158 | DEFER, FALSE, &sx->delivery_start); |
| 2159 | yield = DEFER; |
| 2160 | goto SEND_QUIT; |
| 2161 | } |
| 2162 | } |
| 2163 | #endif |
| 2164 | |
| 2165 | /* Now check if the helo_data expansion went well, and sign off cleanly if |
| 2166 | it didn't. */ |
| 2167 | |
| 2168 | if (!sx->helo_data) |
| 2169 | { |
| 2170 | message = string_sprintf("failed to expand helo_data: %s", |
| 2171 | expand_string_message); |
| 2172 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start); |
| 2173 | yield = DEFER; |
| 2174 | goto SEND_QUIT; |
| 2175 | } |
| 2176 | } |
| 2177 | |
| 2178 | /** Debugging without sending a message |
| 2179 | sx->addrlist->transport_return = DEFER; |
| 2180 | goto SEND_QUIT; |
| 2181 | **/ |
| 2182 | |
| 2183 | /* Errors that occur after this point follow an SMTP command, which is |
| 2184 | left in big_buffer by smtp_write_command() for use in error messages. */ |
| 2185 | |
| 2186 | smtp_command = big_buffer; |
| 2187 | |
| 2188 | /* Tell the remote who we are... |
| 2189 | |
| 2190 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the |
| 2191 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the |
| 2192 | greeting is of this form. The assumption was that the far end supports it |
| 2193 | properly... but experience shows that there are some that give 5xx responses, |
| 2194 | even though the banner includes "ESMTP" (there's a bloody-minded one that |
| 2195 | says "ESMTP not spoken here"). Cope with that case. |
| 2196 | |
| 2197 | September 2000: Time has passed, and it seems reasonable now to always send |
| 2198 | EHLO at the start. It is also convenient to make the change while installing |
| 2199 | the TLS stuff. |
| 2200 | |
| 2201 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" |
| 2202 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There |
| 2203 | would be no way to send out the mails, so there is now a host list |
| 2204 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the |
| 2205 | PIPELINING problem as well. Maybe it can also be useful to cure other |
| 2206 | problems with broken servers. |
| 2207 | |
| 2208 | Exim originally sent "Helo" at this point and ran for nearly a year that way. |
| 2209 | Then somebody tried it with a Microsoft mailer... It seems that all other |
| 2210 | mailers use upper case for some reason (the RFC is quite clear about case |
| 2211 | independence) so, for peace of mind, I gave in. */ |
| 2212 | |
| 2213 | sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK; |
| 2214 | |
| 2215 | /* Alas; be careful, since this goto is not an error-out, so conceivably |
| 2216 | we might set data between here and the target which we assume to exist |
| 2217 | and be usable. I can see this coming back to bite us. */ |
| 2218 | #ifndef DISABLE_TLS |
| 2219 | if (sx->smtps) |
| 2220 | { |
| 2221 | smtp_peer_options |= OPTION_TLS; |
| 2222 | suppress_tls = FALSE; |
| 2223 | ob->tls_tempfail_tryclear = FALSE; |
| 2224 | smtp_command = US"SSL-on-connect"; |
| 2225 | goto TLS_NEGOTIATE; |
| 2226 | } |
| 2227 | #endif |
| 2228 | |
| 2229 | if (sx->esmtp) |
| 2230 | { |
| 2231 | if (smtp_write_command(sx, |
| 2232 | #ifndef DISABLE_PIPE_CONNECT |
| 2233 | sx->early_pipe_active ? SCMD_BUFFER : |
| 2234 | #endif |
| 2235 | SCMD_FLUSH, |
| 2236 | "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0) |
| 2237 | goto SEND_FAILED; |
| 2238 | sx->esmtp_sent = TRUE; |
| 2239 | |
| 2240 | #ifndef DISABLE_PIPE_CONNECT |
| 2241 | if (sx->early_pipe_active) |
| 2242 | { |
| 2243 | sx->pending_EHLO = TRUE; |
| 2244 | |
| 2245 | /* If we have too many authenticators to handle and might need to AUTH |
| 2246 | for this transport, pipeline no further as we will need the |
| 2247 | list of auth methods offered. Reap the banner and EHLO. */ |
| 2248 | |
| 2249 | if ( (ob->hosts_require_auth || ob->hosts_try_auth) |
| 2250 | && f.smtp_in_early_pipe_no_auth) |
| 2251 | { |
| 2252 | DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n"); |
| 2253 | if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0) |
| 2254 | goto SEND_FAILED; |
| 2255 | if (sync_responses(sx, 2, 0) != 0) |
| 2256 | { |
| 2257 | HDEBUG(D_transport) |
| 2258 | debug_printf("failed reaping pipelined cmd responses\n"); |
| 2259 | goto RESPONSE_FAILED; |
| 2260 | } |
| 2261 | sx->early_pipe_active = FALSE; |
| 2262 | } |
| 2263 | } |
| 2264 | else |
| 2265 | #endif |
| 2266 | if (!smtp_reap_ehlo(sx)) |
| 2267 | goto RESPONSE_FAILED; |
| 2268 | } |
| 2269 | else |
| 2270 | DEBUG(D_transport) |
| 2271 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); |
| 2272 | |
| 2273 | #ifndef DISABLE_PIPE_CONNECT |
| 2274 | if (!sx->early_pipe_active) |
| 2275 | #endif |
| 2276 | if (!sx->esmtp) |
| 2277 | { |
| 2278 | BOOL good_response; |
| 2279 | int n = sizeof(sx->buffer); |
| 2280 | uschar * rsp = sx->buffer; |
| 2281 | |
| 2282 | if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2) |
| 2283 | { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; } |
| 2284 | |
| 2285 | if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0) |
| 2286 | goto SEND_FAILED; |
| 2287 | good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout); |
| 2288 | #ifdef EXPERIMENTAL_DSN_INFO |
| 2289 | sx->helo_response = string_copy(rsp); |
| 2290 | #endif |
| 2291 | if (!good_response) |
| 2292 | { |
| 2293 | /* Handle special logging for a closed connection after HELO |
| 2294 | when had previously sent EHLO */ |
| 2295 | |
| 2296 | if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET)) |
| 2297 | { |
| 2298 | errno = ERRNO_SMTPCLOSED; |
| 2299 | goto EHLOHELO_FAILED; |
| 2300 | } |
| 2301 | memmove(sx->buffer, rsp, Ustrlen(rsp)); |
| 2302 | goto RESPONSE_FAILED; |
| 2303 | } |
| 2304 | } |
| 2305 | |
| 2306 | if (sx->esmtp || sx->lmtp) |
| 2307 | { |
| 2308 | #ifndef DISABLE_PIPE_CONNECT |
| 2309 | if (!sx->early_pipe_active) |
| 2310 | #endif |
| 2311 | { |
| 2312 | sx->peer_offered = ehlo_response(sx->buffer, |
| 2313 | OPTION_TLS /* others checked later */ |
| 2314 | #ifndef DISABLE_PIPE_CONNECT |
| 2315 | | (sx->early_pipe_ok |
| 2316 | ? OPTION_IGNQ |
| 2317 | | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE |
| 2318 | #ifdef SUPPORT_I18N |
| 2319 | | OPTION_UTF8 |
| 2320 | #endif |
| 2321 | | OPTION_EARLY_PIPE |
| 2322 | : 0 |
| 2323 | ) |
| 2324 | #endif |
| 2325 | ); |
| 2326 | #ifndef DISABLE_PIPE_CONNECT |
| 2327 | if (sx->early_pipe_ok) |
| 2328 | { |
| 2329 | sx->ehlo_resp.cleartext_features = sx->peer_offered; |
| 2330 | |
| 2331 | if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE)) |
| 2332 | == (OPTION_PIPE | OPTION_EARLY_PIPE)) |
| 2333 | { |
| 2334 | DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n"); |
| 2335 | sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx); |
| 2336 | write_ehlo_cache_entry(sx); |
| 2337 | } |
| 2338 | } |
| 2339 | #endif |
| 2340 | } |
| 2341 | |
| 2342 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ |
| 2343 | |
| 2344 | #ifndef DISABLE_TLS |
| 2345 | smtp_peer_options |= sx->peer_offered & OPTION_TLS; |
| 2346 | #endif |
| 2347 | } |
| 2348 | } |
| 2349 | |
| 2350 | /* For continuing deliveries down the same channel, having re-exec'd the socket |
| 2351 | is the standard input; for a socket held open from verify it is recorded |
| 2352 | in the cutthrough context block. Either way we don't need to redo EHLO here |
| 2353 | (but may need to do so for TLS - see below). |
| 2354 | Set up the pointer to where subsequent commands will be left, for |
| 2355 | error messages. Note that smtp_peer_options will have been |
| 2356 | set from the command line if they were set in the process that passed the |
| 2357 | connection on. */ |
| 2358 | |
| 2359 | /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c |
| 2360 | as the continue goes via transport_pass_socket() and doublefork and exec. |
| 2361 | It does not wait. Unclear how we keep separate host's responses |
| 2362 | separate - we could match up by host ip+port as a bodge. */ |
| 2363 | |
| 2364 | else |
| 2365 | { |
| 2366 | if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only) |
| 2367 | { |
| 2368 | sx->cctx = cutthrough.cctx; |
| 2369 | sx->conn_args.host->port = sx->port = cutthrough.host.port; |
| 2370 | } |
| 2371 | else |
| 2372 | { |
| 2373 | sx->cctx.sock = 0; /* stdin */ |
| 2374 | sx->cctx.tls_ctx = NULL; |
| 2375 | smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */ |
| 2376 | } |
| 2377 | sx->inblock.cctx = sx->outblock.cctx = &sx->cctx; |
| 2378 | smtp_command = big_buffer; |
| 2379 | sx->peer_offered = smtp_peer_options; |
| 2380 | sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */ |
| 2381 | |
| 2382 | /* For a continued connection with TLS being proxied for us, or a |
| 2383 | held-open verify connection with TLS, nothing more to do. */ |
| 2384 | |
| 2385 | if ( continue_proxy_cipher |
| 2386 | || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only |
| 2387 | && cutthrough.is_tls) |
| 2388 | ) |
| 2389 | { |
| 2390 | sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE); |
| 2391 | HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n", |
| 2392 | continue_proxy_cipher ? "proxied" : "verify conn with"); |
| 2393 | return OK; |
| 2394 | } |
| 2395 | HDEBUG(D_transport) debug_printf("continued connection, no TLS\n"); |
| 2396 | } |
| 2397 | |
| 2398 | /* If TLS is available on this connection, whether continued or not, attempt to |
| 2399 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, |
| 2400 | send another EHLO - the server may give a different answer in secure mode. We |
| 2401 | use a separate buffer for reading the response to STARTTLS so that if it is |
| 2402 | negative, the original EHLO data is available for subsequent analysis, should |
| 2403 | the client not be required to use TLS. If the response is bad, copy the buffer |
| 2404 | for error analysis. */ |
| 2405 | |
| 2406 | #ifndef DISABLE_TLS |
| 2407 | if ( smtp_peer_options & OPTION_TLS |
| 2408 | && !suppress_tls |
| 2409 | && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK |
| 2410 | && ( !sx->verify |
| 2411 | || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK |
| 2412 | ) ) |
| 2413 | { |
| 2414 | uschar buffer2[4096]; |
| 2415 | |
| 2416 | if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0) |
| 2417 | goto SEND_FAILED; |
| 2418 | |
| 2419 | #ifndef DISABLE_PIPE_CONNECT |
| 2420 | /* If doing early-pipelining reap the banner and EHLO-response but leave |
| 2421 | the response for the STARTTLS we just sent alone. */ |
| 2422 | |
| 2423 | if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0) |
| 2424 | { |
| 2425 | HDEBUG(D_transport) |
| 2426 | debug_printf("failed reaping pipelined cmd responses\n"); |
| 2427 | close(sx->cctx.sock); |
| 2428 | sx->cctx.sock = -1; |
| 2429 | sx->early_pipe_active = FALSE; |
| 2430 | goto PIPE_CONNECT_RETRY; |
| 2431 | } |
| 2432 | #endif |
| 2433 | |
| 2434 | /* If there is an I/O error, transmission of this message is deferred. If |
| 2435 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is |
| 2436 | false, we also defer. However, if there is a temporary rejection of STARTTLS |
| 2437 | and tls_tempfail_tryclear is true, or if there is an outright rejection of |
| 2438 | STARTTLS, we carry on. This means we will try to send the message in clear, |
| 2439 | unless the host is in hosts_require_tls (tested below). */ |
| 2440 | |
| 2441 | if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout)) |
| 2442 | { |
| 2443 | if ( errno != 0 |
| 2444 | || buffer2[0] == 0 |
| 2445 | || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear) |
| 2446 | ) |
| 2447 | { |
| 2448 | Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer)); |
| 2449 | sx->buffer[sizeof(sx->buffer)-1] = '\0'; |
| 2450 | goto RESPONSE_FAILED; |
| 2451 | } |
| 2452 | } |
| 2453 | |
| 2454 | /* STARTTLS accepted: try to negotiate a TLS session. */ |
| 2455 | |
| 2456 | else |
| 2457 | TLS_NEGOTIATE: |
| 2458 | { |
| 2459 | if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr)) |
| 2460 | { |
| 2461 | /* TLS negotiation failed; give an error. From outside, this function may |
| 2462 | be called again to try in clear on a new connection, if the options permit |
| 2463 | it for this host. */ |
| 2464 | #ifdef USE_GNUTLS |
| 2465 | GNUTLS_CONN_FAILED: |
| 2466 | #endif |
| 2467 | DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr); |
| 2468 | |
| 2469 | # ifdef SUPPORT_DANE |
| 2470 | if (sx->conn_args.dane) |
| 2471 | { |
| 2472 | log_write(0, LOG_MAIN, |
| 2473 | "DANE attempt failed; TLS connection to %s [%s]: %s", |
| 2474 | sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr); |
| 2475 | # ifndef DISABLE_EVENT |
| 2476 | (void) event_raise(sx->conn_args.tblock->event_action, |
| 2477 | US"dane:fail", US"validation-failure"); /* could do with better detail */ |
| 2478 | # endif |
| 2479 | } |
| 2480 | # endif |
| 2481 | |
| 2482 | errno = ERRNO_TLSFAILURE; |
| 2483 | message = string_sprintf("TLS session: %s", tls_errstr); |
| 2484 | sx->send_quit = FALSE; |
| 2485 | goto TLS_FAILED; |
| 2486 | } |
| 2487 | |
| 2488 | /* TLS session is set up */ |
| 2489 | |
| 2490 | smtp_peer_options_wrap = smtp_peer_options; |
| 2491 | for (address_item * addr = sx->addrlist; addr; addr = addr->next) |
| 2492 | if (addr->transport_return == PENDING_DEFER) |
| 2493 | { |
| 2494 | addr->cipher = tls_out.cipher; |
| 2495 | addr->ourcert = tls_out.ourcert; |
| 2496 | addr->peercert = tls_out.peercert; |
| 2497 | addr->peerdn = tls_out.peerdn; |
| 2498 | addr->ocsp = tls_out.ocsp; |
| 2499 | addr->tlsver = tls_out.ver; |
| 2500 | } |
| 2501 | } |
| 2502 | } |
| 2503 | |
| 2504 | /* if smtps, we'll have smtp_command set to something else; always safe to |
| 2505 | reset it here. */ |
| 2506 | smtp_command = big_buffer; |
| 2507 | |
| 2508 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If |
| 2509 | helo_data is null, we are dealing with a connection that was passed from |
| 2510 | another process, and so we won't have expanded helo_data above. We have to |
| 2511 | expand it here. $sending_ip_address and $sending_port are set up right at the |
| 2512 | start of the Exim process (in exim.c). */ |
| 2513 | |
| 2514 | if (tls_out.active.sock >= 0) |
| 2515 | { |
| 2516 | uschar * greeting_cmd; |
| 2517 | |
| 2518 | if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data))) |
| 2519 | { |
| 2520 | uschar *message = string_sprintf("failed to expand helo_data: %s", |
| 2521 | expand_string_message); |
| 2522 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start); |
| 2523 | yield = DEFER; |
| 2524 | goto SEND_QUIT; |
| 2525 | } |
| 2526 | |
| 2527 | #ifndef DISABLE_PIPE_CONNECT |
| 2528 | /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit. |
| 2529 | We're unlikely to get the group sent and delivered before the server sends its |
| 2530 | banner, but it's still worth sending as a group. |
| 2531 | For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not |
| 2532 | the reverse. */ |
| 2533 | |
| 2534 | if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active) |
| 2535 | { |
| 2536 | sx->peer_offered = sx->ehlo_resp.crypted_features; |
| 2537 | if ((sx->early_pipe_active = |
| 2538 | !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE))) |
| 2539 | DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n"); |
| 2540 | } |
| 2541 | #endif |
| 2542 | |
| 2543 | /* For SMTPS we need to wait for the initial OK response. */ |
| 2544 | if (sx->smtps) |
| 2545 | #ifndef DISABLE_PIPE_CONNECT |
| 2546 | if (sx->early_pipe_active) |
| 2547 | { |
| 2548 | sx->pending_BANNER = TRUE; |
| 2549 | sx->outblock.cmd_count = 1; |
| 2550 | } |
| 2551 | else |
| 2552 | #endif |
| 2553 | if (!smtp_reap_banner(sx)) |
| 2554 | goto RESPONSE_FAILED; |
| 2555 | |
| 2556 | if (sx->lmtp) |
| 2557 | greeting_cmd = US"LHLO"; |
| 2558 | else if (sx->esmtp) |
| 2559 | greeting_cmd = US"EHLO"; |
| 2560 | else |
| 2561 | { |
| 2562 | greeting_cmd = US"HELO"; |
| 2563 | DEBUG(D_transport) |
| 2564 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); |
| 2565 | } |
| 2566 | |
| 2567 | if (smtp_write_command(sx, |
| 2568 | #ifndef DISABLE_PIPE_CONNECT |
| 2569 | sx->early_pipe_active ? SCMD_BUFFER : |
| 2570 | #endif |
| 2571 | SCMD_FLUSH, |
| 2572 | "%s %s\r\n", greeting_cmd, sx->helo_data) < 0) |
| 2573 | goto SEND_FAILED; |
| 2574 | |
| 2575 | #ifndef DISABLE_PIPE_CONNECT |
| 2576 | if (sx->early_pipe_active) |
| 2577 | sx->pending_EHLO = TRUE; |
| 2578 | else |
| 2579 | #endif |
| 2580 | { |
| 2581 | if (!smtp_reap_ehlo(sx)) |
| 2582 | #ifdef USE_GNUTLS |
| 2583 | { |
| 2584 | /* The GnuTLS layer in Exim only spots a server-rejection of a client |
| 2585 | cert late, under TLS1.3 - which means here; the first time we try to |
| 2586 | receive crypted data. Treat it as if it was a connect-time failure. |
| 2587 | See also the early-pipe equivalent... which will be hard; every call |
| 2588 | to sync_responses will need to check the result. |
| 2589 | It would be nicer to have GnuTLS check the cert during the handshake. |
| 2590 | Can it do that, with all the flexibility we need? */ |
| 2591 | |
| 2592 | tls_errstr = US"error on first read"; |
| 2593 | goto GNUTLS_CONN_FAILED; |
| 2594 | } |
| 2595 | #else |
| 2596 | goto RESPONSE_FAILED; |
| 2597 | #endif |
| 2598 | smtp_peer_options = 0; |
| 2599 | } |
| 2600 | } |
| 2601 | |
| 2602 | /* If the host is required to use a secure channel, ensure that we |
| 2603 | have one. */ |
| 2604 | |
| 2605 | else if ( sx->smtps |
| 2606 | # ifdef SUPPORT_DANE |
| 2607 | || sx->conn_args.dane |
| 2608 | # endif |
| 2609 | || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK |
| 2610 | ) |
| 2611 | { |
| 2612 | errno = ERRNO_TLSREQUIRED; |
| 2613 | message = string_sprintf("a TLS session is required, but %s", |
| 2614 | smtp_peer_options & OPTION_TLS |
| 2615 | ? "an attempt to start TLS failed" : "the server did not offer TLS support"); |
| 2616 | # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT) |
| 2617 | if (sx->conn_args.dane) |
| 2618 | (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail", |
| 2619 | smtp_peer_options & OPTION_TLS |
| 2620 | ? US"validation-failure" /* could do with better detail */ |
| 2621 | : US"starttls-not-supported"); |
| 2622 | # endif |
| 2623 | goto TLS_FAILED; |
| 2624 | } |
| 2625 | #endif /*DISABLE_TLS*/ |
| 2626 | |
| 2627 | /* If TLS is active, we have just started it up and re-done the EHLO command, |
| 2628 | so its response needs to be analyzed. If TLS is not active and this is a |
| 2629 | continued session down a previously-used socket, we haven't just done EHLO, so |
| 2630 | we skip this. */ |
| 2631 | |
| 2632 | if (continue_hostname == NULL |
| 2633 | #ifndef DISABLE_TLS |
| 2634 | || tls_out.active.sock >= 0 |
| 2635 | #endif |
| 2636 | ) |
| 2637 | { |
| 2638 | if (sx->esmtp || sx->lmtp) |
| 2639 | { |
| 2640 | #ifndef DISABLE_PIPE_CONNECT |
| 2641 | if (!sx->early_pipe_active) |
| 2642 | #endif |
| 2643 | { |
| 2644 | sx->peer_offered = ehlo_response(sx->buffer, |
| 2645 | 0 /* no TLS */ |
| 2646 | #ifndef DISABLE_PIPE_CONNECT |
| 2647 | | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0) |
| 2648 | | OPTION_DSN | OPTION_PIPE | OPTION_SIZE |
| 2649 | | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8 |
| 2650 | | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */ |
| 2651 | |
| 2652 | #else |
| 2653 | |
| 2654 | | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0) |
| 2655 | | OPTION_CHUNKING |
| 2656 | | OPTION_PRDR |
| 2657 | # ifdef SUPPORT_I18N |
| 2658 | | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0) |
| 2659 | /*XXX if we hand peercaps on to continued-conn processes, |
| 2660 | must not depend on this addr */ |
| 2661 | # endif |
| 2662 | | OPTION_DSN |
| 2663 | | OPTION_PIPE |
| 2664 | | (ob->size_addition >= 0 ? OPTION_SIZE : 0) |
| 2665 | #endif |
| 2666 | ); |
| 2667 | #ifndef DISABLE_PIPE_CONNECT |
| 2668 | if (tls_out.active.sock >= 0) |
| 2669 | sx->ehlo_resp.crypted_features = sx->peer_offered; |
| 2670 | #endif |
| 2671 | } |
| 2672 | |
| 2673 | /* Set for IGNOREQUOTA if the response to LHLO specifies support and the |
| 2674 | lmtp_ignore_quota option was set. */ |
| 2675 | |
| 2676 | sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US""; |
| 2677 | |
| 2678 | /* If the response to EHLO specified support for the SIZE parameter, note |
| 2679 | this, provided size_addition is non-negative. */ |
| 2680 | |
| 2681 | smtp_peer_options |= sx->peer_offered & OPTION_SIZE; |
| 2682 | |
| 2683 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched |
| 2684 | the current host, esmtp will be false, so PIPELINING can never be used. If |
| 2685 | the current host matches hosts_avoid_pipelining, don't do it. */ |
| 2686 | |
| 2687 | if ( sx->peer_offered & OPTION_PIPE |
| 2688 | && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK) |
| 2689 | smtp_peer_options |= OPTION_PIPE; |
| 2690 | |
| 2691 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", |
| 2692 | smtp_peer_options & OPTION_PIPE ? "" : "not "); |
| 2693 | |
| 2694 | if ( sx->peer_offered & OPTION_CHUNKING |
| 2695 | && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK) |
| 2696 | sx->peer_offered &= ~OPTION_CHUNKING; |
| 2697 | |
| 2698 | if (sx->peer_offered & OPTION_CHUNKING) |
| 2699 | DEBUG(D_transport) debug_printf("CHUNKING usable\n"); |
| 2700 | |
| 2701 | #ifndef DISABLE_PRDR |
| 2702 | if ( sx->peer_offered & OPTION_PRDR |
| 2703 | && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK) |
| 2704 | sx->peer_offered &= ~OPTION_PRDR; |
| 2705 | |
| 2706 | if (sx->peer_offered & OPTION_PRDR) |
| 2707 | DEBUG(D_transport) debug_printf("PRDR usable\n"); |
| 2708 | #endif |
| 2709 | |
| 2710 | /* Note if the server supports DSN */ |
| 2711 | smtp_peer_options |= sx->peer_offered & OPTION_DSN; |
| 2712 | DEBUG(D_transport) debug_printf("%susing DSN\n", |
| 2713 | sx->peer_offered & OPTION_DSN ? "" : "not "); |
| 2714 | |
| 2715 | #ifndef DISABLE_PIPE_CONNECT |
| 2716 | if ( sx->early_pipe_ok |
| 2717 | && !sx->early_pipe_active |
| 2718 | && tls_out.active.sock >= 0 |
| 2719 | && smtp_peer_options & OPTION_PIPE |
| 2720 | && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features) |
| 2721 | & OPTION_EARLY_PIPE) |
| 2722 | { |
| 2723 | DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n"); |
| 2724 | sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx); |
| 2725 | write_ehlo_cache_entry(sx); |
| 2726 | } |
| 2727 | #endif |
| 2728 | |
| 2729 | /* Note if the response to EHLO specifies support for the AUTH extension. |
| 2730 | If it has, check that this host is one we want to authenticate to, and do |
| 2731 | the business. The host name and address must be available when the |
| 2732 | authenticator's client driver is running. */ |
| 2733 | |
| 2734 | switch (yield = smtp_auth(sx)) |
| 2735 | { |
| 2736 | default: goto SEND_QUIT; |
| 2737 | case OK: break; |
| 2738 | case FAIL_SEND: goto SEND_FAILED; |
| 2739 | case FAIL: goto RESPONSE_FAILED; |
| 2740 | } |
| 2741 | } |
| 2742 | } |
| 2743 | sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE); |
| 2744 | |
| 2745 | /* The setting up of the SMTP call is now complete. Any subsequent errors are |
| 2746 | message-specific. */ |
| 2747 | |
| 2748 | sx->setting_up = FALSE; |
| 2749 | |
| 2750 | #ifdef SUPPORT_I18N |
| 2751 | if (sx->addrlist->prop.utf8_msg) |
| 2752 | { |
| 2753 | uschar * s; |
| 2754 | |
| 2755 | /* If the transport sets a downconversion mode it overrides any set by ACL |
| 2756 | for the message. */ |
| 2757 | |
| 2758 | if ((s = ob->utf8_downconvert)) |
| 2759 | { |
| 2760 | if (!(s = expand_string(s))) |
| 2761 | { |
| 2762 | message = string_sprintf("failed to expand utf8_downconvert: %s", |
| 2763 | expand_string_message); |
| 2764 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start); |
| 2765 | yield = DEFER; |
| 2766 | goto SEND_QUIT; |
| 2767 | } |
| 2768 | switch (*s) |
| 2769 | { |
| 2770 | case '1': sx->addrlist->prop.utf8_downcvt = TRUE; |
| 2771 | sx->addrlist->prop.utf8_downcvt_maybe = FALSE; |
| 2772 | break; |
| 2773 | case '0': sx->addrlist->prop.utf8_downcvt = FALSE; |
| 2774 | sx->addrlist->prop.utf8_downcvt_maybe = FALSE; |
| 2775 | break; |
| 2776 | case '-': if (s[1] == '1') |
| 2777 | { |
| 2778 | sx->addrlist->prop.utf8_downcvt = FALSE; |
| 2779 | sx->addrlist->prop.utf8_downcvt_maybe = TRUE; |
| 2780 | } |
| 2781 | break; |
| 2782 | } |
| 2783 | } |
| 2784 | |
| 2785 | sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt |
| 2786 | && !sx->addrlist->prop.utf8_downcvt_maybe; |
| 2787 | DEBUG(D_transport) if (!sx->utf8_needed) |
| 2788 | debug_printf("utf8: %s downconvert\n", |
| 2789 | sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional"); |
| 2790 | } |
| 2791 | |
| 2792 | /* If this is an international message we need the host to speak SMTPUTF8 */ |
| 2793 | if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8)) |
| 2794 | { |
| 2795 | errno = ERRNO_UTF8_FWD; |
| 2796 | goto RESPONSE_FAILED; |
| 2797 | } |
| 2798 | #endif /*SUPPORT_I18N*/ |
| 2799 | |
| 2800 | return OK; |
| 2801 | |
| 2802 | |
| 2803 | { |
| 2804 | int code; |
| 2805 | |
| 2806 | RESPONSE_FAILED: |
| 2807 | if (errno == ECONNREFUSED) /* first-read error on a TFO conn */ |
| 2808 | { |
| 2809 | /* There is a testing facility for simulating a connection timeout, as I |
| 2810 | can't think of any other way of doing this. It converts a connection |
| 2811 | refused into a timeout if the timeout is set to 999999. This is done for |
| 2812 | a 3whs connection in ip_connect(), but a TFO connection does not error |
| 2813 | there - instead it gets ECONNREFUSED on the first data read. Tracking |
| 2814 | that a TFO really was done is too hard, or we would set a |
| 2815 | sx->pending_conn_done bit and test that in smtp_reap_banner() and |
| 2816 | smtp_reap_ehlo(). That would let us also add the conn-timeout to the |
| 2817 | cmd-timeout. */ |
| 2818 | |
| 2819 | if (f.running_in_test_harness && ob->connect_timeout == 999999) |
| 2820 | errno = ETIMEDOUT; |
| 2821 | set_errno_nohost(sx->addrlist, |
| 2822 | errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno, |
| 2823 | sx->verify ? US strerror(errno) : NULL, |
| 2824 | DEFER, FALSE, &sx->delivery_start); |
| 2825 | sx->send_quit = FALSE; |
| 2826 | return DEFER; |
| 2827 | } |
| 2828 | |
| 2829 | /* really an error on an SMTP read */ |
| 2830 | message = NULL; |
| 2831 | sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno, |
| 2832 | sx->buffer, &code, &message, &pass_message); |
| 2833 | yield = DEFER; |
| 2834 | goto FAILED; |
| 2835 | |
| 2836 | SEND_FAILED: |
| 2837 | code = '4'; |
| 2838 | message = US string_sprintf("send() to %s [%s] failed: %s", |
| 2839 | sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno)); |
| 2840 | sx->send_quit = FALSE; |
| 2841 | yield = DEFER; |
| 2842 | goto FAILED; |
| 2843 | |
| 2844 | EHLOHELO_FAILED: |
| 2845 | code = '4'; |
| 2846 | message = string_sprintf("Remote host closed connection in response to %s" |
| 2847 | " (EHLO response was: %s)", smtp_command, sx->buffer); |
| 2848 | sx->send_quit = FALSE; |
| 2849 | yield = DEFER; |
| 2850 | goto FAILED; |
| 2851 | |
| 2852 | /* This label is jumped to directly when a TLS negotiation has failed, |
| 2853 | or was not done for a host for which it is required. Values will be set |
| 2854 | in message and errno, and setting_up will always be true. Treat as |
| 2855 | a temporary error. */ |
| 2856 | |
| 2857 | #ifndef DISABLE_TLS |
| 2858 | TLS_FAILED: |
| 2859 | code = '4', yield = DEFER; |
| 2860 | goto FAILED; |
| 2861 | #endif |
| 2862 | |
| 2863 | /* The failure happened while setting up the call; see if the failure was |
| 2864 | a 5xx response (this will either be on connection, or following HELO - a 5xx |
| 2865 | after EHLO causes it to try HELO). If so, and there are no more hosts to try, |
| 2866 | fail all addresses, as this host is never going to accept them. For other |
| 2867 | errors during setting up (timeouts or whatever), defer all addresses, and |
| 2868 | yield DEFER, so that the host is not tried again for a while. |
| 2869 | |
| 2870 | XXX This peeking for another host feels like a layering violation. We want |
| 2871 | to note the host as unusable, but down here we shouldn't know if this was |
| 2872 | the last host to try for the addr(list). Perhaps the upper layer should be |
| 2873 | the one to do set_errno() ? The problem is that currently the addr is where |
| 2874 | errno etc. are stashed, but until we run out of hosts to try the errors are |
| 2875 | host-specific. Maybe we should enhance the host_item definition? */ |
| 2876 | |
| 2877 | FAILED: |
| 2878 | sx->ok = FALSE; /* For when reached by GOTO */ |
| 2879 | set_errno(sx->addrlist, errno, message, |
| 2880 | sx->conn_args.host->next |
| 2881 | ? DEFER |
| 2882 | : code == '5' |
| 2883 | #ifdef SUPPORT_I18N |
| 2884 | || errno == ERRNO_UTF8_FWD |
| 2885 | #endif |
| 2886 | ? FAIL : DEFER, |
| 2887 | pass_message, |
| 2888 | errno == ECONNREFUSED ? NULL : sx->conn_args.host, |
| 2889 | #ifdef EXPERIMENTAL_DSN_INFO |
| 2890 | sx->smtp_greeting, sx->helo_response, |
| 2891 | #endif |
| 2892 | &sx->delivery_start); |
| 2893 | } |
| 2894 | |
| 2895 | |
| 2896 | SEND_QUIT: |
| 2897 | |
| 2898 | if (sx->send_quit) |
| 2899 | (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n"); |
| 2900 | |
| 2901 | #ifndef DISABLE_TLS |
| 2902 | if (sx->cctx.tls_ctx) |
| 2903 | { |
| 2904 | tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT); |
| 2905 | sx->cctx.tls_ctx = NULL; |
| 2906 | } |
| 2907 | #endif |
| 2908 | |
| 2909 | /* Close the socket, and return the appropriate value, first setting |
| 2910 | works because the NULL setting is passed back to the calling process, and |
| 2911 | remote_max_parallel is forced to 1 when delivering over an existing connection, |
| 2912 | */ |
| 2913 | |
| 2914 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
| 2915 | if (sx->send_quit) |
| 2916 | { |
| 2917 | shutdown(sx->cctx.sock, SHUT_WR); |
| 2918 | if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0) |
| 2919 | for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;) |
| 2920 | i--; /* drain socket */ |
| 2921 | sx->send_quit = FALSE; |
| 2922 | } |
| 2923 | (void)close(sx->cctx.sock); |
| 2924 | sx->cctx.sock = -1; |
| 2925 | |
| 2926 | #ifndef DISABLE_EVENT |
| 2927 | (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL); |
| 2928 | #endif |
| 2929 | |
| 2930 | continue_transport = NULL; |
| 2931 | continue_hostname = NULL; |
| 2932 | return yield; |
| 2933 | } |
| 2934 | |
| 2935 | |
| 2936 | |
| 2937 | |
| 2938 | /* Create the string of options that will be appended to the MAIL FROM: |
| 2939 | in the connection context buffer */ |
| 2940 | |
| 2941 | static int |
| 2942 | build_mailcmd_options(smtp_context * sx, address_item * addrlist) |
| 2943 | { |
| 2944 | uschar * p = sx->buffer; |
| 2945 | address_item * addr; |
| 2946 | int address_count; |
| 2947 | |
| 2948 | *p = 0; |
| 2949 | |
| 2950 | /* If we know the receiving MTA supports the SIZE qualification, and we know it, |
| 2951 | send it, adding something to the message size to allow for imprecision |
| 2952 | and things that get added en route. Exim keeps the number of lines |
| 2953 | in a message, so we can give an accurate value for the original message, but we |
| 2954 | need some additional to handle added headers. (Double "." characters don't get |
| 2955 | included in the count.) */ |
| 2956 | |
| 2957 | if ( message_size > 0 |
| 2958 | && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE)) |
| 2959 | { |
| 2960 | /*XXX problem here under spool_files_wireformat? |
| 2961 | Or just forget about lines? Or inflate by a fixed proportion? */ |
| 2962 | |
| 2963 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition); |
| 2964 | while (*p) p++; |
| 2965 | } |
| 2966 | |
| 2967 | #ifndef DISABLE_PRDR |
| 2968 | /* If it supports Per-Recipient Data Responses, and we have more than one recipient, |
| 2969 | request that */ |
| 2970 | |
| 2971 | sx->prdr_active = FALSE; |
| 2972 | if (sx->peer_offered & OPTION_PRDR) |
| 2973 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 2974 | if (addr->transport_return == PENDING_DEFER) |
| 2975 | { |
| 2976 | for (addr = addr->next; addr; addr = addr->next) |
| 2977 | if (addr->transport_return == PENDING_DEFER) |
| 2978 | { /* at least two recipients to send */ |
| 2979 | sx->prdr_active = TRUE; |
| 2980 | sprintf(CS p, " PRDR"); p += 5; |
| 2981 | break; |
| 2982 | } |
| 2983 | break; |
| 2984 | } |
| 2985 | #endif |
| 2986 | |
| 2987 | #ifdef SUPPORT_I18N |
| 2988 | /* If it supports internationalised messages, and this meesage need that, |
| 2989 | request it */ |
| 2990 | |
| 2991 | if ( sx->peer_offered & OPTION_UTF8 |
| 2992 | && addrlist->prop.utf8_msg |
| 2993 | && !addrlist->prop.utf8_downcvt |
| 2994 | ) |
| 2995 | Ustrcpy(p, US" SMTPUTF8"), p += 9; |
| 2996 | #endif |
| 2997 | |
| 2998 | /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */ |
| 2999 | for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0; |
| 3000 | addr && address_count < sx->max_rcpt; |
| 3001 | addr = addr->next) if (addr->transport_return == PENDING_DEFER) |
| 3002 | { |
| 3003 | address_count++; |
| 3004 | if (!(addr->dsn_flags & rf_dsnlasthop)) |
| 3005 | { |
| 3006 | sx->dsn_all_lasthop = FALSE; |
| 3007 | break; |
| 3008 | } |
| 3009 | } |
| 3010 | |
| 3011 | /* Add any DSN flags to the mail command */ |
| 3012 | |
| 3013 | if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop) |
| 3014 | { |
| 3015 | if (dsn_ret == dsn_ret_hdrs) |
| 3016 | { Ustrcpy(p, US" RET=HDRS"); p += 9; } |
| 3017 | else if (dsn_ret == dsn_ret_full) |
| 3018 | { Ustrcpy(p, US" RET=FULL"); p += 9; } |
| 3019 | |
| 3020 | if (dsn_envid) |
| 3021 | { |
| 3022 | string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid); |
| 3023 | while (*p) p++; |
| 3024 | } |
| 3025 | } |
| 3026 | |
| 3027 | /* If an authenticated_sender override has been specified for this transport |
| 3028 | instance, expand it. If the expansion is forced to fail, and there was already |
| 3029 | an authenticated_sender for this message, the original value will be used. |
| 3030 | Other expansion failures are serious. An empty result is ignored, but there is |
| 3031 | otherwise no check - this feature is expected to be used with LMTP and other |
| 3032 | cases where non-standard addresses (e.g. without domains) might be required. */ |
| 3033 | |
| 3034 | return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK; |
| 3035 | } |
| 3036 | |
| 3037 | |
| 3038 | static void |
| 3039 | build_rcptcmd_options(smtp_context * sx, const address_item * addr) |
| 3040 | { |
| 3041 | uschar * p = sx->buffer; |
| 3042 | *p = 0; |
| 3043 | |
| 3044 | /* Add any DSN flags to the rcpt command */ |
| 3045 | |
| 3046 | if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop)) |
| 3047 | { |
| 3048 | if (addr->dsn_flags & rf_dsnflags) |
| 3049 | { |
| 3050 | BOOL first = TRUE; |
| 3051 | |
| 3052 | Ustrcpy(p, US" NOTIFY="); |
| 3053 | while (*p) p++; |
| 3054 | for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i]) |
| 3055 | { |
| 3056 | if (!first) *p++ = ','; |
| 3057 | first = FALSE; |
| 3058 | Ustrcpy(p, rf_names[i]); |
| 3059 | while (*p) p++; |
| 3060 | } |
| 3061 | } |
| 3062 | |
| 3063 | if (addr->dsn_orcpt) |
| 3064 | { |
| 3065 | string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s", |
| 3066 | addr->dsn_orcpt); |
| 3067 | while (*p) p++; |
| 3068 | } |
| 3069 | } |
| 3070 | } |
| 3071 | |
| 3072 | |
| 3073 | |
| 3074 | /* |
| 3075 | Return: |
| 3076 | 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL) |
| 3077 | -1 MAIL response error |
| 3078 | -2 any non-MAIL read i/o error |
| 3079 | -3 non-MAIL response timeout |
| 3080 | -4 internal error; channel still usable |
| 3081 | -5 transmit failed |
| 3082 | */ |
| 3083 | |
| 3084 | int |
| 3085 | smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield) |
| 3086 | { |
| 3087 | address_item * addr; |
| 3088 | int address_count, pipe_limit; |
| 3089 | int rc; |
| 3090 | |
| 3091 | if (build_mailcmd_options(sx, sx->first_addr) != OK) |
| 3092 | { |
| 3093 | *yield = ERROR; |
| 3094 | return -4; |
| 3095 | } |
| 3096 | |
| 3097 | /* From here until we send the DATA command, we can make use of PIPELINING |
| 3098 | if the server host supports it. The code has to be able to check the responses |
| 3099 | at any point, for when the buffer fills up, so we write it totally generally. |
| 3100 | When PIPELINING is off, each command written reports that it has flushed the |
| 3101 | buffer. */ |
| 3102 | |
| 3103 | sx->pending_MAIL = TRUE; /* The block starts with MAIL */ |
| 3104 | |
| 3105 | { |
| 3106 | uschar * s = sx->from_addr; |
| 3107 | #ifdef SUPPORT_I18N |
| 3108 | uschar * errstr = NULL; |
| 3109 | |
| 3110 | /* If we must downconvert, do the from-address here. Remember we had to |
| 3111 | for the to-addresses (done below), and also (ugly) for re-doing when building |
| 3112 | the delivery log line. */ |
| 3113 | |
| 3114 | if ( sx->addrlist->prop.utf8_msg |
| 3115 | && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8)) |
| 3116 | ) |
| 3117 | { |
| 3118 | if (s = string_address_utf8_to_alabel(s, &errstr), errstr) |
| 3119 | { |
| 3120 | set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start); |
| 3121 | *yield = ERROR; |
| 3122 | return -4; |
| 3123 | } |
| 3124 | setflag(sx->addrlist, af_utf8_downcvt); |
| 3125 | } |
| 3126 | #endif |
| 3127 | |
| 3128 | rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH, |
| 3129 | "MAIL FROM:<%s>%s\r\n", s, sx->buffer); |
| 3130 | } |
| 3131 | |
| 3132 | mail_command = string_copy(big_buffer); /* Save for later error message */ |
| 3133 | |
| 3134 | switch(rc) |
| 3135 | { |
| 3136 | case -1: /* Transmission error */ |
| 3137 | return -5; |
| 3138 | |
| 3139 | case +1: /* Cmd was sent */ |
| 3140 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', |
| 3141 | (SOB sx->conn_args.ob)->command_timeout)) |
| 3142 | { |
| 3143 | if (errno == 0 && sx->buffer[0] == '4') |
| 3144 | { |
| 3145 | errno = ERRNO_MAIL4XX; |
| 3146 | sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 3147 | } |
| 3148 | return -1; |
| 3149 | } |
| 3150 | sx->pending_MAIL = FALSE; |
| 3151 | break; |
| 3152 | |
| 3153 | /* otherwise zero: command queued for pipeline */ |
| 3154 | } |
| 3155 | |
| 3156 | /* Pass over all the relevant recipient addresses for this host, which are the |
| 3157 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send |
| 3158 | several before we have to read the responses for those seen so far. This |
| 3159 | checking is done by a subroutine because it also needs to be done at the end. |
| 3160 | Send only up to max_rcpt addresses at a time, leaving next_addr pointing to |
| 3161 | the next one if not all are sent. |
| 3162 | |
| 3163 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the |
| 3164 | last address because we want to abort if any recipients have any kind of |
| 3165 | problem, temporary or permanent. We know that all recipient addresses will have |
| 3166 | the PENDING_DEFER status, because only one attempt is ever made, and we know |
| 3167 | that max_rcpt will be large, so all addresses will be done at once. |
| 3168 | |
| 3169 | For verify we flush the pipeline after any (the only) rcpt address. */ |
| 3170 | |
| 3171 | for (addr = sx->first_addr, address_count = 0, pipe_limit = 100; |
| 3172 | addr && address_count < sx->max_rcpt; |
| 3173 | addr = addr->next) if (addr->transport_return == PENDING_DEFER) |
| 3174 | { |
| 3175 | int cmds_sent; |
| 3176 | BOOL no_flush; |
| 3177 | uschar * rcpt_addr; |
| 3178 | |
| 3179 | addr->dsn_aware = sx->peer_offered & OPTION_DSN |
| 3180 | ? dsn_support_yes : dsn_support_no; |
| 3181 | |
| 3182 | address_count++; |
| 3183 | if (pipe_limit-- <= 0) |
| 3184 | { no_flush = FALSE; pipe_limit = 100; } |
| 3185 | else |
| 3186 | no_flush = pipelining_active && !sx->verify |
| 3187 | && (!mua_wrapper || addr->next && address_count < sx->max_rcpt); |
| 3188 | |
| 3189 | build_rcptcmd_options(sx, addr); |
| 3190 | |
| 3191 | /* Now send the RCPT command, and process outstanding responses when |
| 3192 | necessary. After a timeout on RCPT, we just end the function, leaving the |
| 3193 | yield as OK, because this error can often mean that there is a problem with |
| 3194 | just one address, so we don't want to delay the host. */ |
| 3195 | |
| 3196 | rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes); |
| 3197 | |
| 3198 | #ifdef SUPPORT_I18N |
| 3199 | if ( testflag(sx->addrlist, af_utf8_downcvt) |
| 3200 | && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL)) |
| 3201 | ) |
| 3202 | { |
| 3203 | /*XXX could we use a per-address errstr here? Not fail the whole send? */ |
| 3204 | errno = ERRNO_EXPANDFAIL; |
| 3205 | return -5; /*XXX too harsh? */ |
| 3206 | } |
| 3207 | #endif |
| 3208 | |
| 3209 | cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH, |
| 3210 | "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer); |
| 3211 | |
| 3212 | if (cmds_sent < 0) return -5; |
| 3213 | if (cmds_sent > 0) |
| 3214 | { |
| 3215 | switch(sync_responses(sx, cmds_sent, 0)) |
| 3216 | { |
| 3217 | case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 3218 | case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */ |
| 3219 | break; |
| 3220 | |
| 3221 | case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 3222 | if (!sx->lmtp) /* can't tell about progress yet */ |
| 3223 | sx->completed_addr = TRUE; |
| 3224 | case 0: /* No 2xx or 5xx, but no probs */ |
| 3225 | /* If any RCPT got a 452 response then next_addr has been updated |
| 3226 | for restarting with a new MAIL on the same connection. Send no more |
| 3227 | RCPTs for this MAIL. */ |
| 3228 | |
| 3229 | if (sx->RCPT_452) |
| 3230 | { |
| 3231 | DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n"); |
| 3232 | sx->RCPT_452 = FALSE; |
| 3233 | /* sx->next_addr has been reset for fast_retry */ |
| 3234 | return 0; |
| 3235 | } |
| 3236 | break; |
| 3237 | |
| 3238 | case -1: return -3; /* Timeout on RCPT */ |
| 3239 | case -2: return -2; /* non-MAIL read i/o error */ |
| 3240 | default: return -1; /* any MAIL error */ |
| 3241 | |
| 3242 | #ifndef DISABLE_PIPE_CONNECT |
| 3243 | case -4: return -1; /* non-2xx for pipelined banner or EHLO */ |
| 3244 | case -5: return -1; /* TLS first-read error */ |
| 3245 | #endif |
| 3246 | } |
| 3247 | } |
| 3248 | } /* Loop for next address */ |
| 3249 | |
| 3250 | sx->next_addr = addr; |
| 3251 | return 0; |
| 3252 | } |
| 3253 | |
| 3254 | |
| 3255 | #ifndef DISABLE_TLS |
| 3256 | /***************************************************** |
| 3257 | * Proxy TLS connection for another transport process * |
| 3258 | ******************************************************/ |
| 3259 | /* |
| 3260 | Close the unused end of the pipe, fork once more, then use the given buffer |
| 3261 | as a staging area, and select on both the given fd and the TLS'd client-fd for |
| 3262 | data to read (per the coding in ip_recv() and fd_ready() this is legitimate). |
| 3263 | Do blocking full-size writes, and reads under a timeout. Once both input |
| 3264 | channels are closed, exit the process. |
| 3265 | |
| 3266 | Arguments: |
| 3267 | ct_ctx tls context |
| 3268 | buf space to use for buffering |
| 3269 | bufsiz size of buffer |
| 3270 | pfd pipe filedescriptor array; [0] is comms to proxied process |
| 3271 | timeout per-read timeout, seconds |
| 3272 | |
| 3273 | Does not return. |
| 3274 | */ |
| 3275 | |
| 3276 | void |
| 3277 | smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd, |
| 3278 | int timeout) |
| 3279 | { |
| 3280 | fd_set rfds, efds; |
| 3281 | int max_fd = MAX(pfd[0], tls_out.active.sock) + 1; |
| 3282 | int rc, i; |
| 3283 | |
| 3284 | close(pfd[1]); |
| 3285 | if ((rc = exim_fork(US"tls-proxy"))) |
| 3286 | _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
| 3287 | |
| 3288 | set_process_info("proxying TLS connection for continued transport"); |
| 3289 | FD_ZERO(&rfds); |
| 3290 | FD_SET(tls_out.active.sock, &rfds); |
| 3291 | FD_SET(pfd[0], &rfds); |
| 3292 | |
| 3293 | for (int fd_bits = 3; fd_bits; ) |
| 3294 | { |
| 3295 | time_t time_left = timeout; |
| 3296 | time_t time_start = time(NULL); |
| 3297 | |
| 3298 | /* wait for data */ |
| 3299 | efds = rfds; |
| 3300 | do |
| 3301 | { |
| 3302 | struct timeval tv = { time_left, 0 }; |
| 3303 | |
| 3304 | rc = select(max_fd, |
| 3305 | (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv); |
| 3306 | |
| 3307 | if (rc < 0 && errno == EINTR) |
| 3308 | if ((time_left -= time(NULL) - time_start) > 0) continue; |
| 3309 | |
| 3310 | if (rc <= 0) |
| 3311 | { |
| 3312 | DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__); |
| 3313 | goto done; |
| 3314 | } |
| 3315 | |
| 3316 | if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds)) |
| 3317 | { |
| 3318 | DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n", |
| 3319 | FD_ISSET(pfd[0], &efds) ? "proxy" : "tls"); |
| 3320 | goto done; |
| 3321 | } |
| 3322 | } |
| 3323 | while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds))); |
| 3324 | |
| 3325 | /* handle inbound data */ |
| 3326 | if (FD_ISSET(tls_out.active.sock, &rfds)) |
| 3327 | if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0) |
| 3328 | { |
| 3329 | fd_bits &= ~1; |
| 3330 | FD_CLR(tls_out.active.sock, &rfds); |
| 3331 | shutdown(pfd[0], SHUT_WR); |
| 3332 | timeout = 5; |
| 3333 | } |
| 3334 | else |
| 3335 | { |
| 3336 | for (int nbytes = 0; rc - nbytes > 0; nbytes += i) |
| 3337 | if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done; |
| 3338 | } |
| 3339 | else if (fd_bits & 1) |
| 3340 | FD_SET(tls_out.active.sock, &rfds); |
| 3341 | |
| 3342 | /* handle outbound data */ |
| 3343 | if (FD_ISSET(pfd[0], &rfds)) |
| 3344 | if ((rc = read(pfd[0], buf, bsize)) <= 0) |
| 3345 | { |
| 3346 | fd_bits = 0; |
| 3347 | tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT); |
| 3348 | ct_ctx = NULL; |
| 3349 | } |
| 3350 | else |
| 3351 | { |
| 3352 | for (int nbytes = 0; rc - nbytes > 0; nbytes += i) |
| 3353 | if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0) |
| 3354 | goto done; |
| 3355 | } |
| 3356 | else if (fd_bits & 2) |
| 3357 | FD_SET(pfd[0], &rfds); |
| 3358 | } |
| 3359 | |
| 3360 | done: |
| 3361 | testharness_pause_ms(100); /* let logging complete */ |
| 3362 | exim_exit(EXIT_SUCCESS); |
| 3363 | } |
| 3364 | #endif |
| 3365 | |
| 3366 | |
| 3367 | /************************************************* |
| 3368 | * Deliver address list to given host * |
| 3369 | *************************************************/ |
| 3370 | |
| 3371 | /* If continue_hostname is not null, we get here only when continuing to |
| 3372 | deliver down an existing channel. The channel was passed as the standard |
| 3373 | input. TLS is never active on a passed channel; the previous process either |
| 3374 | closes it down before passing the connection on, or inserts a TLS-proxy |
| 3375 | process and passes on a cleartext conection. |
| 3376 | |
| 3377 | Otherwise, we have to make a connection to the remote host, and do the |
| 3378 | initial protocol exchange. |
| 3379 | |
| 3380 | When running as an MUA wrapper, if the sender or any recipient is rejected, |
| 3381 | temporarily or permanently, we force failure for all recipients. |
| 3382 | |
| 3383 | Arguments: |
| 3384 | addrlist chain of potential addresses to deliver; only those whose |
| 3385 | transport_return field is set to PENDING_DEFER are currently |
| 3386 | being processed; others should be skipped - they have either |
| 3387 | been delivered to an earlier host or IP address, or been |
| 3388 | failed by one of them. |
| 3389 | host host to deliver to |
| 3390 | host_af AF_INET or AF_INET6 |
| 3391 | defport default TCP/IP port to use if host does not specify, in host |
| 3392 | byte order |
| 3393 | interface interface to bind to, or NULL |
| 3394 | tblock transport instance block |
| 3395 | message_defer set TRUE if yield is OK, but all addresses were deferred |
| 3396 | because of a non-recipient, non-host failure, that is, a |
| 3397 | 4xx response to MAIL FROM, DATA, or ".". This is a defer |
| 3398 | that is specific to the message. |
| 3399 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for |
| 3400 | a second attempt after TLS initialization fails |
| 3401 | |
| 3402 | Returns: OK - the connection was made and the delivery attempted; |
| 3403 | the result for each address is in its data block. |
| 3404 | DEFER - the connection could not be made, or something failed |
| 3405 | while setting up the SMTP session, or there was a |
| 3406 | non-message-specific error, such as a timeout. |
| 3407 | ERROR - a filter command is specified for this transport, |
| 3408 | and there was a problem setting it up; OR helo_data |
| 3409 | or add_headers or authenticated_sender is specified |
| 3410 | for this transport, and the string failed to expand |
| 3411 | |
| 3412 | For all non-OK returns the first addr of the list carries the |
| 3413 | time taken for the attempt. |
| 3414 | */ |
| 3415 | |
| 3416 | static int |
| 3417 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport, |
| 3418 | uschar *interface, transport_instance *tblock, |
| 3419 | BOOL *message_defer, BOOL suppress_tls) |
| 3420 | { |
| 3421 | smtp_transport_options_block * ob = SOB tblock->options_block; |
| 3422 | int yield = OK; |
| 3423 | int save_errno; |
| 3424 | int rc; |
| 3425 | |
| 3426 | BOOL pass_message = FALSE; |
| 3427 | uschar *message = NULL; |
| 3428 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; |
| 3429 | smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */ |
| 3430 | |
| 3431 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ |
| 3432 | *message_defer = FALSE; |
| 3433 | |
| 3434 | memset(sx, 0, sizeof(*sx)); |
| 3435 | sx->addrlist = addrlist; |
| 3436 | sx->conn_args.host = host; |
| 3437 | sx->conn_args.host_af = host_af, |
| 3438 | sx->port = defport; |
| 3439 | sx->conn_args.interface = interface; |
| 3440 | sx->helo_data = NULL; |
| 3441 | sx->conn_args.tblock = tblock; |
| 3442 | /* sx->verify = FALSE; */ |
| 3443 | gettimeofday(&sx->delivery_start, NULL); |
| 3444 | sx->sync_addr = sx->first_addr = addrlist; |
| 3445 | |
| 3446 | /* Get the channel set up ready for a message (MAIL FROM being the next |
| 3447 | SMTP command to send */ |
| 3448 | |
| 3449 | if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK) |
| 3450 | { |
| 3451 | timesince(&addrlist->delivery_time, &sx->delivery_start); |
| 3452 | return rc; |
| 3453 | } |
| 3454 | |
| 3455 | /* If there is a filter command specified for this transport, we can now |
| 3456 | set it up. This cannot be done until the identity of the host is known. */ |
| 3457 | |
| 3458 | if (tblock->filter_command) |
| 3459 | { |
| 3460 | transport_filter_timeout = tblock->filter_timeout; |
| 3461 | |
| 3462 | /* On failure, copy the error to all addresses, abandon the SMTP call, and |
| 3463 | yield ERROR. */ |
| 3464 | |
| 3465 | if (!transport_set_up_command(&transport_filter_argv, |
| 3466 | tblock->filter_command, TRUE, DEFER, addrlist, |
| 3467 | string_sprintf("%.50s transport", tblock->name), NULL)) |
| 3468 | { |
| 3469 | set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER, |
| 3470 | FALSE, &sx->delivery_start); |
| 3471 | yield = ERROR; |
| 3472 | goto SEND_QUIT; |
| 3473 | } |
| 3474 | |
| 3475 | if ( transport_filter_argv |
| 3476 | && *transport_filter_argv |
| 3477 | && **transport_filter_argv |
| 3478 | && sx->peer_offered & OPTION_CHUNKING |
| 3479 | #ifndef DISABLE_DKIM |
| 3480 | /* When dkim signing, chunking is handled even with a transport-filter */ |
| 3481 | && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector) |
| 3482 | && !ob->dkim.force_bodyhash |
| 3483 | #endif |
| 3484 | ) |
| 3485 | { |
| 3486 | sx->peer_offered &= ~OPTION_CHUNKING; |
| 3487 | DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n"); |
| 3488 | } |
| 3489 | } |
| 3490 | |
| 3491 | /* For messages that have more than the maximum number of envelope recipients, |
| 3492 | we want to send several transactions down the same SMTP connection. (See |
| 3493 | comments in deliver.c as to how this reconciles, heuristically, with |
| 3494 | remote_max_parallel.) This optimization was added to Exim after the following |
| 3495 | code was already working. The simplest way to put it in without disturbing the |
| 3496 | code was to use a goto to jump back to this point when there is another |
| 3497 | transaction to handle. */ |
| 3498 | |
| 3499 | SEND_MESSAGE: |
| 3500 | sx->from_addr = return_path; |
| 3501 | sx->sync_addr = sx->first_addr; |
| 3502 | sx->ok = FALSE; |
| 3503 | sx->send_rset = TRUE; |
| 3504 | sx->completed_addr = FALSE; |
| 3505 | |
| 3506 | |
| 3507 | /* If we are a continued-connection-after-verify the MAIL and RCPT |
| 3508 | commands were already sent; do not re-send but do mark the addrs as |
| 3509 | having been accepted up to RCPT stage. A traditional cont-conn |
| 3510 | always has a sequence number greater than one. */ |
| 3511 | |
| 3512 | if (continue_hostname && continue_sequence == 1) |
| 3513 | { |
| 3514 | /* sx->pending_MAIL = FALSE; */ |
| 3515 | sx->ok = TRUE; |
| 3516 | /* sx->next_addr = NULL; */ |
| 3517 | |
| 3518 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 3519 | addr->transport_return = PENDING_OK; |
| 3520 | } |
| 3521 | else |
| 3522 | { |
| 3523 | /* Initiate a message transfer. */ |
| 3524 | |
| 3525 | switch(smtp_write_mail_and_rcpt_cmds(sx, &yield)) |
| 3526 | { |
| 3527 | case 0: break; |
| 3528 | case -1: case -2: goto RESPONSE_FAILED; |
| 3529 | case -3: goto END_OFF; |
| 3530 | case -4: goto SEND_QUIT; |
| 3531 | default: goto SEND_FAILED; |
| 3532 | } |
| 3533 | |
| 3534 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either |
| 3535 | permanently or temporarily. We should have flushed and synced after the last |
| 3536 | RCPT. */ |
| 3537 | |
| 3538 | if (mua_wrapper) |
| 3539 | { |
| 3540 | address_item * a; |
| 3541 | unsigned cnt; |
| 3542 | |
| 3543 | for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++) |
| 3544 | if (a->transport_return != PENDING_OK) |
| 3545 | { |
| 3546 | /*XXX could we find a better errno than 0 here? */ |
| 3547 | set_errno_nohost(addrlist, 0, a->message, FAIL, |
| 3548 | testflag(a, af_pass_message), &sx->delivery_start); |
| 3549 | sx->ok = FALSE; |
| 3550 | break; |
| 3551 | } |
| 3552 | } |
| 3553 | } |
| 3554 | |
| 3555 | /* If ok is TRUE, we know we have got at least one good recipient, and must now |
| 3556 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still |
| 3557 | have a good recipient buffered up if we are pipelining. We don't want to waste |
| 3558 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we |
| 3559 | are pipelining. The responses are all handled by sync_responses(). |
| 3560 | If using CHUNKING, do not send a BDAT until we know how big a chunk we want |
| 3561 | to send is. */ |
| 3562 | |
| 3563 | if ( !(sx->peer_offered & OPTION_CHUNKING) |
| 3564 | && (sx->ok || (pipelining_active && !mua_wrapper))) |
| 3565 | { |
| 3566 | int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n"); |
| 3567 | |
| 3568 | if (count < 0) goto SEND_FAILED; |
| 3569 | switch(sync_responses(sx, count, sx->ok ? +1 : -1)) |
| 3570 | { |
| 3571 | case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 3572 | case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */ |
| 3573 | break; |
| 3574 | |
| 3575 | case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 3576 | if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */ |
| 3577 | case 0: break; /* No 2xx or 5xx, but no probs */ |
| 3578 | |
| 3579 | case -1: goto END_OFF; /* Timeout on RCPT */ |
| 3580 | |
| 3581 | #ifndef DISABLE_PIPE_CONNECT |
| 3582 | case -5: /* TLS first-read error */ |
| 3583 | case -4: HDEBUG(D_transport) |
| 3584 | debug_printf("failed reaping pipelined cmd responses\n"); |
| 3585 | #endif |
| 3586 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ |
| 3587 | } |
| 3588 | pipelining_active = FALSE; |
| 3589 | data_command = string_copy(big_buffer); /* Save for later error message */ |
| 3590 | } |
| 3591 | |
| 3592 | /* If there were no good recipients (but otherwise there have been no |
| 3593 | problems), just set ok TRUE, since we have handled address-specific errors |
| 3594 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism |
| 3595 | for handling the SMTP dot-handling protocol, flagging to apply to headers as |
| 3596 | well as body. Set the appropriate timeout value to be used for each chunk. |
| 3597 | (Haven't been able to make it work using select() for writing yet.) */ |
| 3598 | |
| 3599 | if ( !sx->ok |
| 3600 | && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active)) |
| 3601 | { |
| 3602 | /* Save the first address of the next batch. */ |
| 3603 | sx->first_addr = sx->next_addr; |
| 3604 | |
| 3605 | sx->ok = TRUE; |
| 3606 | } |
| 3607 | else |
| 3608 | { |
| 3609 | transport_ctx tctx = { |
| 3610 | .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */ |
| 3611 | .tblock = tblock, |
| 3612 | .addr = addrlist, |
| 3613 | .check_string = US".", |
| 3614 | .escape_string = US"..", /* Escaping strings */ |
| 3615 | .options = |
| 3616 | topt_use_crlf | topt_escape_headers |
| 3617 | | (tblock->body_only ? topt_no_headers : 0) |
| 3618 | | (tblock->headers_only ? topt_no_body : 0) |
| 3619 | | (tblock->return_path_add ? topt_add_return_path : 0) |
| 3620 | | (tblock->delivery_date_add ? topt_add_delivery_date : 0) |
| 3621 | | (tblock->envelope_to_add ? topt_add_envelope_to : 0) |
| 3622 | }; |
| 3623 | |
| 3624 | /* If using CHUNKING we need a callback from the generic transport |
| 3625 | support to us, for the sending of BDAT smtp commands and the reaping |
| 3626 | of responses. The callback needs a whole bunch of state so set up |
| 3627 | a transport-context structure to be passed around. */ |
| 3628 | |
| 3629 | if (sx->peer_offered & OPTION_CHUNKING) |
| 3630 | { |
| 3631 | tctx.check_string = tctx.escape_string = NULL; |
| 3632 | tctx.options |= topt_use_bdat; |
| 3633 | tctx.chunk_cb = smtp_chunk_cmd_callback; |
| 3634 | sx->pending_BDAT = FALSE; |
| 3635 | sx->good_RCPT = sx->ok; |
| 3636 | sx->cmd_count = 0; |
| 3637 | tctx.smtp_context = sx; |
| 3638 | } |
| 3639 | else |
| 3640 | tctx.options |= topt_end_dot; |
| 3641 | |
| 3642 | /* Save the first address of the next batch. */ |
| 3643 | sx->first_addr = sx->next_addr; |
| 3644 | |
| 3645 | /* Responses from CHUNKING commands go in buffer. Otherwise, |
| 3646 | there has not been a response. */ |
| 3647 | |
| 3648 | sx->buffer[0] = 0; |
| 3649 | |
| 3650 | sigalrm_seen = FALSE; |
| 3651 | transport_write_timeout = ob->data_timeout; |
| 3652 | smtp_command = US"sending data block"; /* For error messages */ |
| 3653 | DEBUG(D_transport|D_v) |
| 3654 | if (sx->peer_offered & OPTION_CHUNKING) |
| 3655 | debug_printf(" will write message using CHUNKING\n"); |
| 3656 | else |
| 3657 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); |
| 3658 | transport_count = 0; |
| 3659 | |
| 3660 | #ifndef DISABLE_DKIM |
| 3661 | { |
| 3662 | # ifdef MEASURE_TIMING |
| 3663 | struct timeval t0; |
| 3664 | gettimeofday(&t0, NULL); |
| 3665 | # endif |
| 3666 | dkim_exim_sign_init(); |
| 3667 | # ifdef EXPERIMENTAL_ARC |
| 3668 | { |
| 3669 | uschar * s = ob->arc_sign; |
| 3670 | if (s) |
| 3671 | { |
| 3672 | if (!(ob->dkim.arc_signspec = s = expand_string(s))) |
| 3673 | { |
| 3674 | if (!f.expand_string_forcedfail) |
| 3675 | { |
| 3676 | message = US"failed to expand arc_sign"; |
| 3677 | sx->ok = FALSE; |
| 3678 | goto SEND_FAILED; |
| 3679 | } |
| 3680 | } |
| 3681 | else if (*s) |
| 3682 | { |
| 3683 | /* Ask dkim code to hash the body for ARC */ |
| 3684 | (void) arc_ams_setup_sign_bodyhash(); |
| 3685 | ob->dkim.force_bodyhash = TRUE; |
| 3686 | } |
| 3687 | } |
| 3688 | } |
| 3689 | # endif |
| 3690 | # ifdef MEASURE_TIMING |
| 3691 | report_time_since(&t0, US"dkim_exim_sign_init (delta)"); |
| 3692 | # endif |
| 3693 | } |
| 3694 | sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message); |
| 3695 | #else |
| 3696 | sx->ok = transport_write_message(&tctx, 0); |
| 3697 | #endif |
| 3698 | |
| 3699 | /* transport_write_message() uses write() because it is called from other |
| 3700 | places to write to non-sockets. This means that under some OS (e.g. Solaris) |
| 3701 | it can exit with "Broken pipe" as its error. This really means that the |
| 3702 | socket got closed at the far end. */ |
| 3703 | |
| 3704 | transport_write_timeout = 0; /* for subsequent transports */ |
| 3705 | |
| 3706 | /* Failure can either be some kind of I/O disaster (including timeout), |
| 3707 | or the failure of a transport filter or the expansion of added headers. |
| 3708 | Or, when CHUNKING, it can be a protocol-detected failure. */ |
| 3709 | |
| 3710 | if (!sx->ok) |
| 3711 | if (message) goto SEND_FAILED; |
| 3712 | else goto RESPONSE_FAILED; |
| 3713 | |
| 3714 | /* We used to send the terminating "." explicitly here, but because of |
| 3715 | buffering effects at both ends of TCP/IP connections, you don't gain |
| 3716 | anything by keeping it separate, so it might as well go in the final |
| 3717 | data buffer for efficiency. This is now done by setting the topt_end_dot |
| 3718 | flag above. */ |
| 3719 | |
| 3720 | smtp_command = US"end of data"; |
| 3721 | |
| 3722 | if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1) |
| 3723 | { |
| 3724 | /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */ |
| 3725 | switch(sync_responses(sx, sx->cmd_count-1, 0)) |
| 3726 | { |
| 3727 | case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */ |
| 3728 | case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */ |
| 3729 | break; |
| 3730 | |
| 3731 | case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ |
| 3732 | if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */ |
| 3733 | case 0: break; /* No 2xx or 5xx, but no probs */ |
| 3734 | |
| 3735 | case -1: goto END_OFF; /* Timeout on RCPT */ |
| 3736 | |
| 3737 | #ifndef DISABLE_PIPE_CONNECT |
| 3738 | case -5: /* TLS first-read error */ |
| 3739 | case -4: HDEBUG(D_transport) |
| 3740 | debug_printf("failed reaping pipelined cmd responses\n"); |
| 3741 | #endif |
| 3742 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ |
| 3743 | } |
| 3744 | } |
| 3745 | |
| 3746 | #ifndef DISABLE_PRDR |
| 3747 | /* For PRDR we optionally get a partial-responses warning followed by the |
| 3748 | individual responses, before going on with the overall response. If we don't |
| 3749 | get the warning then deal with per non-PRDR. */ |
| 3750 | |
| 3751 | if(sx->prdr_active) |
| 3752 | { |
| 3753 | sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout); |
| 3754 | if (!sx->ok && errno == 0) switch(sx->buffer[0]) |
| 3755 | { |
| 3756 | case '2': sx->prdr_active = FALSE; |
| 3757 | sx->ok = TRUE; |
| 3758 | break; |
| 3759 | case '4': errno = ERRNO_DATA4XX; |
| 3760 | addrlist->more_errno |= |
| 3761 | ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 3762 | break; |
| 3763 | } |
| 3764 | } |
| 3765 | else |
| 3766 | #endif |
| 3767 | |
| 3768 | /* For non-PRDR SMTP, we now read a single response that applies to the |
| 3769 | whole message. If it is OK, then all the addresses have been delivered. */ |
| 3770 | |
| 3771 | if (!sx->lmtp) |
| 3772 | { |
| 3773 | sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', |
| 3774 | ob->final_timeout); |
| 3775 | if (!sx->ok && errno == 0 && sx->buffer[0] == '4') |
| 3776 | { |
| 3777 | errno = ERRNO_DATA4XX; |
| 3778 | addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 3779 | } |
| 3780 | } |
| 3781 | |
| 3782 | /* For LMTP, we get back a response for every RCPT command that we sent; |
| 3783 | some may be accepted and some rejected. For those that get a response, their |
| 3784 | status is fixed; any that are accepted have been handed over, even if later |
| 3785 | responses crash - at least, that's how I read RFC 2033. |
| 3786 | |
| 3787 | If all went well, mark the recipient addresses as completed, record which |
| 3788 | host/IPaddress they were delivered to, and cut out RSET when sending another |
| 3789 | message down the same channel. Write the completed addresses to the journal |
| 3790 | now so that they are recorded in case there is a crash of hardware or |
| 3791 | software before the spool gets updated. Also record the final SMTP |
| 3792 | confirmation if needed (for SMTP only). */ |
| 3793 | |
| 3794 | if (sx->ok) |
| 3795 | { |
| 3796 | int flag = '='; |
| 3797 | struct timeval delivery_time; |
| 3798 | int len; |
| 3799 | uschar * conf = NULL; |
| 3800 | |
| 3801 | timesince(&delivery_time, &sx->delivery_start); |
| 3802 | sx->send_rset = FALSE; |
| 3803 | pipelining_active = FALSE; |
| 3804 | |
| 3805 | /* Set up confirmation if needed - applies only to SMTP */ |
| 3806 | |
| 3807 | if ( |
| 3808 | #ifdef DISABLE_EVENT |
| 3809 | LOGGING(smtp_confirmation) && |
| 3810 | #endif |
| 3811 | !sx->lmtp |
| 3812 | ) |
| 3813 | { |
| 3814 | const uschar *s = string_printing(sx->buffer); |
| 3815 | /* deconst cast ok here as string_printing was checked to have alloc'n'copied */ |
| 3816 | conf = (s == sx->buffer)? US string_copy(s) : US s; |
| 3817 | } |
| 3818 | |
| 3819 | /* Process all transported addresses - for LMTP or PRDR, read a status for |
| 3820 | each one. */ |
| 3821 | |
| 3822 | for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next) |
| 3823 | { |
| 3824 | if (addr->transport_return != PENDING_OK) continue; |
| 3825 | |
| 3826 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the |
| 3827 | remaining addresses. Otherwise, it's a return code for just the one |
| 3828 | address. For temporary errors, add a retry item for the address so that |
| 3829 | it doesn't get tried again too soon. */ |
| 3830 | |
| 3831 | #ifndef DISABLE_PRDR |
| 3832 | if (sx->lmtp || sx->prdr_active) |
| 3833 | #else |
| 3834 | if (sx->lmtp) |
| 3835 | #endif |
| 3836 | { |
| 3837 | if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', |
| 3838 | ob->final_timeout)) |
| 3839 | { |
| 3840 | if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED; |
| 3841 | addr->message = string_sprintf( |
| 3842 | #ifndef DISABLE_PRDR |
| 3843 | "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP", |
| 3844 | #else |
| 3845 | "LMTP error after %s: %s", |
| 3846 | #endif |
| 3847 | data_command, string_printing(sx->buffer)); |
| 3848 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
| 3849 | if (sx->buffer[0] == '5') |
| 3850 | addr->transport_return = FAIL; |
| 3851 | else |
| 3852 | { |
| 3853 | errno = ERRNO_DATA4XX; |
| 3854 | addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 3855 | addr->transport_return = DEFER; |
| 3856 | #ifndef DISABLE_PRDR |
| 3857 | if (!sx->prdr_active) |
| 3858 | #endif |
| 3859 | retry_add_item(addr, addr->address_retry_key, 0); |
| 3860 | } |
| 3861 | continue; |
| 3862 | } |
| 3863 | sx->completed_addr = TRUE; /* NOW we can set this flag */ |
| 3864 | if (LOGGING(smtp_confirmation)) |
| 3865 | { |
| 3866 | const uschar *s = string_printing(sx->buffer); |
| 3867 | /* deconst cast ok here as string_printing was checked to have alloc'n'copied */ |
| 3868 | conf = (s == sx->buffer) ? US string_copy(s) : US s; |
| 3869 | } |
| 3870 | } |
| 3871 | |
| 3872 | /* SMTP, or success return from LMTP for this address. Pass back the |
| 3873 | actual host that was used. */ |
| 3874 | |
| 3875 | addr->transport_return = OK; |
| 3876 | addr->host_used = host; |
| 3877 | addr->delivery_time = delivery_time; |
| 3878 | addr->special_action = flag; |
| 3879 | addr->message = conf; |
| 3880 | |
| 3881 | if (tcp_out_fastopen) |
| 3882 | { |
| 3883 | setflag(addr, af_tcp_fastopen_conn); |
| 3884 | if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen); |
| 3885 | if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data); |
| 3886 | } |
| 3887 | if (sx->pipelining_used) setflag(addr, af_pipelining); |
| 3888 | #ifndef DISABLE_PIPE_CONNECT |
| 3889 | if (sx->early_pipe_active) setflag(addr, af_early_pipe); |
| 3890 | #endif |
| 3891 | #ifndef DISABLE_PRDR |
| 3892 | if (sx->prdr_active) setflag(addr, af_prdr_used); |
| 3893 | #endif |
| 3894 | if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used); |
| 3895 | flag = '-'; |
| 3896 | |
| 3897 | #ifndef DISABLE_PRDR |
| 3898 | if (!sx->prdr_active) |
| 3899 | #endif |
| 3900 | { |
| 3901 | /* Update the journal. For homonymic addresses, use the base address plus |
| 3902 | the transport name. See lots of comments in deliver.c about the reasons |
| 3903 | for the complications when homonyms are involved. Just carry on after |
| 3904 | write error, as it may prove possible to update the spool file later. */ |
| 3905 | |
| 3906 | if (testflag(addr, af_homonym)) |
| 3907 | sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); |
| 3908 | else |
| 3909 | sprintf(CS sx->buffer, "%.500s\n", addr->unique); |
| 3910 | |
| 3911 | DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx->buffer); |
| 3912 | len = Ustrlen(CS sx->buffer); |
| 3913 | if (write(journal_fd, sx->buffer, len) != len) |
| 3914 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " |
| 3915 | "%s: %s", sx->buffer, strerror(errno)); |
| 3916 | } |
| 3917 | } |
| 3918 | |
| 3919 | #ifndef DISABLE_PRDR |
| 3920 | if (sx->prdr_active) |
| 3921 | { |
| 3922 | const uschar * overall_message; |
| 3923 | |
| 3924 | /* PRDR - get the final, overall response. For any non-success |
| 3925 | upgrade all the address statuses. */ |
| 3926 | |
| 3927 | sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2', |
| 3928 | ob->final_timeout); |
| 3929 | if (!sx->ok) |
| 3930 | { |
| 3931 | if(errno == 0 && sx->buffer[0] == '4') |
| 3932 | { |
| 3933 | errno = ERRNO_DATA4XX; |
| 3934 | addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8; |
| 3935 | } |
| 3936 | for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next) |
| 3937 | if (sx->buffer[0] == '5' || addr->transport_return == OK) |
| 3938 | addr->transport_return = PENDING_OK; /* allow set_errno action */ |
| 3939 | goto RESPONSE_FAILED; |
| 3940 | } |
| 3941 | |
| 3942 | /* Append the overall response to the individual PRDR response for logging |
| 3943 | and update the journal, or setup retry. */ |
| 3944 | |
| 3945 | overall_message = string_printing(sx->buffer); |
| 3946 | for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next) |
| 3947 | if (addr->transport_return == OK) |
| 3948 | addr->message = string_sprintf("%s\\n%s", addr->message, overall_message); |
| 3949 | |
| 3950 | for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next) |
| 3951 | if (addr->transport_return == OK) |
| 3952 | { |
| 3953 | if (testflag(addr, af_homonym)) |
| 3954 | sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); |
| 3955 | else |
| 3956 | sprintf(CS sx->buffer, "%.500s\n", addr->unique); |
| 3957 | |
| 3958 | DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer); |
| 3959 | len = Ustrlen(CS sx->buffer); |
| 3960 | if (write(journal_fd, sx->buffer, len) != len) |
| 3961 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " |
| 3962 | "%s: %s", sx->buffer, strerror(errno)); |
| 3963 | } |
| 3964 | else if (addr->transport_return == DEFER) |
| 3965 | retry_add_item(addr, addr->address_retry_key, -2); |
| 3966 | } |
| 3967 | #endif |
| 3968 | |
| 3969 | /* Ensure the journal file is pushed out to disk. */ |
| 3970 | |
| 3971 | if (EXIMfsync(journal_fd) < 0) |
| 3972 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", |
| 3973 | strerror(errno)); |
| 3974 | } |
| 3975 | } |
| 3976 | |
| 3977 | |
| 3978 | /* Handle general (not specific to one address) failures here. The value of ok |
| 3979 | is used to skip over this code on the falling through case. A timeout causes a |
| 3980 | deferral. Other errors may defer or fail according to the response code, and |
| 3981 | may set up a special errno value, e.g. after connection chopped, which is |
| 3982 | assumed if errno == 0 and there is no text in the buffer. If control reaches |
| 3983 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as |
| 3984 | the problem is not related to this specific message. */ |
| 3985 | |
| 3986 | if (!sx->ok) |
| 3987 | { |
| 3988 | int code, set_rc; |
| 3989 | uschar * set_message; |
| 3990 | |
| 3991 | RESPONSE_FAILED: |
| 3992 | { |
| 3993 | save_errno = errno; |
| 3994 | message = NULL; |
| 3995 | sx->send_quit = check_response(host, &save_errno, addrlist->more_errno, |
| 3996 | sx->buffer, &code, &message, &pass_message); |
| 3997 | goto FAILED; |
| 3998 | } |
| 3999 | |
| 4000 | SEND_FAILED: |
| 4001 | { |
| 4002 | save_errno = errno; |
| 4003 | code = '4'; |
| 4004 | message = string_sprintf("send() to %s [%s] failed: %s", |
| 4005 | host->name, host->address, message ? message : US strerror(save_errno)); |
| 4006 | sx->send_quit = FALSE; |
| 4007 | goto FAILED; |
| 4008 | } |
| 4009 | |
| 4010 | FAILED: |
| 4011 | { |
| 4012 | BOOL message_error; |
| 4013 | |
| 4014 | sx->ok = FALSE; /* For when reached by GOTO */ |
| 4015 | set_message = message; |
| 4016 | |
| 4017 | /* We want to handle timeouts after MAIL or "." and loss of connection after |
| 4018 | "." specially. They can indicate a problem with the sender address or with |
| 4019 | the contents of the message rather than a real error on the connection. These |
| 4020 | cases are treated in the same way as a 4xx response. This next bit of code |
| 4021 | does the classification. */ |
| 4022 | |
| 4023 | switch(save_errno) |
| 4024 | { |
| 4025 | case 0: |
| 4026 | case ERRNO_MAIL4XX: |
| 4027 | case ERRNO_DATA4XX: |
| 4028 | message_error = TRUE; |
| 4029 | break; |
| 4030 | |
| 4031 | case ETIMEDOUT: |
| 4032 | message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 || |
| 4033 | Ustrncmp(smtp_command,"end ",4) == 0; |
| 4034 | break; |
| 4035 | |
| 4036 | case ERRNO_SMTPCLOSED: |
| 4037 | message_error = Ustrncmp(smtp_command,"end ",4) == 0; |
| 4038 | break; |
| 4039 | |
| 4040 | default: |
| 4041 | message_error = FALSE; |
| 4042 | break; |
| 4043 | } |
| 4044 | |
| 4045 | /* Handle the cases that are treated as message errors. These are: |
| 4046 | |
| 4047 | (a) negative response or timeout after MAIL |
| 4048 | (b) negative response after DATA |
| 4049 | (c) negative response or timeout or dropped connection after "." |
| 4050 | (d) utf8 support required and not offered |
| 4051 | |
| 4052 | It won't be a negative response or timeout after RCPT, as that is dealt |
| 4053 | with separately above. The action in all cases is to set an appropriate |
| 4054 | error code for all the addresses, but to leave yield set to OK because the |
| 4055 | host itself has not failed. Of course, it might in practice have failed |
| 4056 | when we've had a timeout, but if so, we'll discover that at the next |
| 4057 | delivery attempt. For a temporary error, set the message_defer flag, and |
| 4058 | write to the logs for information if this is not the last host. The error |
| 4059 | for the last host will be logged as part of the address's log line. */ |
| 4060 | |
| 4061 | if (message_error) |
| 4062 | { |
| 4063 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ |
| 4064 | |
| 4065 | /* If there's an errno, the message contains just the identity of |
| 4066 | the host. */ |
| 4067 | |
| 4068 | if (code == '5') |
| 4069 | set_rc = FAIL; |
| 4070 | else /* Anything other than 5 is treated as temporary */ |
| 4071 | { |
| 4072 | set_rc = DEFER; |
| 4073 | if (save_errno > 0) |
| 4074 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); |
| 4075 | |
| 4076 | write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0); |
| 4077 | |
| 4078 | *message_defer = TRUE; |
| 4079 | } |
| 4080 | } |
| 4081 | |
| 4082 | /* Otherwise, we have an I/O error or a timeout other than after MAIL or |
| 4083 | ".", or some other transportation error. We defer all addresses and yield |
| 4084 | DEFER, except for the case of failed add_headers expansion, or a transport |
| 4085 | filter failure, when the yield should be ERROR, to stop it trying other |
| 4086 | hosts. */ |
| 4087 | |
| 4088 | else |
| 4089 | { |
| 4090 | #ifndef DISABLE_PIPE_CONNECT |
| 4091 | /* If we were early-pipelinng and the actual EHLO response did not match |
| 4092 | the cached value we assumed, we could have detected it and passed a |
| 4093 | custom errno through to here. It would be nice to RSET and retry right |
| 4094 | away, but to reliably do that we eould need an extra synch point before |
| 4095 | we committed to data and that would discard half the gained roundrips. |
| 4096 | Or we could summarily drop the TCP connection. but that is also ugly. |
| 4097 | Instead, we ignore the possibility (having freshened the cache) and rely |
| 4098 | on the server telling us with a nonmessage error if we have tried to |
| 4099 | do something it no longer supports. */ |
| 4100 | #endif |
| 4101 | set_rc = DEFER; |
| 4102 | yield = (save_errno == ERRNO_CHHEADER_FAIL || |
| 4103 | save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER; |
| 4104 | } |
| 4105 | } |
| 4106 | |
| 4107 | set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host, |
| 4108 | #ifdef EXPERIMENTAL_DSN_INFO |
| 4109 | sx->smtp_greeting, sx->helo_response, |
| 4110 | #endif |
| 4111 | &sx->delivery_start); |
| 4112 | } |
| 4113 | |
| 4114 | /* If all has gone well, send_quit will be set TRUE, implying we can end the |
| 4115 | SMTP session tidily. However, if there were too many addresses to send in one |
| 4116 | message (indicated by first_addr being non-NULL) we want to carry on with the |
| 4117 | rest of them. Also, it is desirable to send more than one message down the SMTP |
| 4118 | connection if there are several waiting, provided we haven't already sent so |
| 4119 | many as to hit the configured limit. The function transport_check_waiting looks |
| 4120 | for a waiting message and returns its id. Then transport_pass_socket tries to |
| 4121 | set up a continued delivery by passing the socket on to another process. The |
| 4122 | variable send_rset is FALSE if a message has just been successfully transferred. |
| 4123 | |
| 4124 | If we are already sending down a continued channel, there may be further |
| 4125 | addresses not yet delivered that are aimed at the same host, but which have not |
| 4126 | been passed in this run of the transport. In this case, continue_more will be |
| 4127 | true, and all we should do is send RSET if necessary, and return, leaving the |
| 4128 | channel open. |
| 4129 | |
| 4130 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we |
| 4131 | do not want to continue with other messages down the same channel, because that |
| 4132 | can lead to looping between two or more messages, all with the same, |
| 4133 | temporarily failing address(es). [The retry information isn't updated yet, so |
| 4134 | new processes keep on trying.] We probably also don't want to try more of this |
| 4135 | message's addresses either. |
| 4136 | |
| 4137 | If we have started a TLS session, we have to end it before passing the |
| 4138 | connection to a new process. However, not all servers can handle this (Exim |
| 4139 | can), so we do not pass such a connection on if the host matches |
| 4140 | hosts_nopass_tls. */ |
| 4141 | |
| 4142 | DEBUG(D_transport) |
| 4143 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " |
| 4144 | "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit, |
| 4145 | sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : ""); |
| 4146 | |
| 4147 | if (sx->completed_addr && sx->ok && sx->send_quit) |
| 4148 | { |
| 4149 | BOOL more; |
| 4150 | smtp_compare_t t_compare; |
| 4151 | |
| 4152 | t_compare.tblock = tblock; |
| 4153 | t_compare.current_sender_address = sender_address; |
| 4154 | |
| 4155 | if ( sx->first_addr != NULL |
| 4156 | || f.continue_more |
| 4157 | || ( |
| 4158 | #ifndef DISABLE_TLS |
| 4159 | ( tls_out.active.sock < 0 && !continue_proxy_cipher |
| 4160 | || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK |
| 4161 | ) |
| 4162 | && |
| 4163 | #endif |
| 4164 | transport_check_waiting(tblock->name, host->name, |
| 4165 | tblock->connection_max_messages, new_message_id, &more, |
| 4166 | (oicf)smtp_are_same_identities, (void*)&t_compare) |
| 4167 | ) ) |
| 4168 | { |
| 4169 | uschar *msg; |
| 4170 | BOOL pass_message; |
| 4171 | |
| 4172 | if (sx->send_rset) |
| 4173 | if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0)) |
| 4174 | { |
| 4175 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, |
| 4176 | host->address, strerror(errno)); |
| 4177 | sx->send_quit = FALSE; |
| 4178 | } |
| 4179 | else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), |
| 4180 | '2', ob->command_timeout))) |
| 4181 | { |
| 4182 | int code; |
| 4183 | sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg, |
| 4184 | &pass_message); |
| 4185 | if (!sx->send_quit) |
| 4186 | { |
| 4187 | DEBUG(D_transport) debug_printf("H=%s [%s] %s\n", |
| 4188 | host->name, host->address, msg); |
| 4189 | } |
| 4190 | } |
| 4191 | |
| 4192 | /* Either RSET was not needed, or it succeeded */ |
| 4193 | |
| 4194 | if (sx->ok) |
| 4195 | { |
| 4196 | #ifndef DISABLE_TLS |
| 4197 | int pfd[2]; |
| 4198 | #endif |
| 4199 | int socket_fd = sx->cctx.sock; |
| 4200 | |
| 4201 | |
| 4202 | if (sx->first_addr != NULL) /* More addresses still to be sent */ |
| 4203 | { /* in this run of the transport */ |
| 4204 | continue_sequence++; /* Causes * in logging */ |
| 4205 | pipelining_active = sx->pipelining_used; /* was cleared at DATA */ |
| 4206 | goto SEND_MESSAGE; |
| 4207 | } |
| 4208 | |
| 4209 | /* Unless caller said it already has more messages listed for this host, |
| 4210 | pass the connection on to a new Exim process (below, the call to |
| 4211 | transport_pass_socket). If the caller has more ready, just return with |
| 4212 | the connection still open. */ |
| 4213 | |
| 4214 | #ifndef DISABLE_TLS |
| 4215 | if (tls_out.active.sock >= 0) |
| 4216 | if ( f.continue_more |
| 4217 | || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK) |
| 4218 | { |
| 4219 | /* Before passing the socket on, or returning to caller with it still |
| 4220 | open, we must shut down TLS. Not all MTAs allow for the continuation |
| 4221 | of the SMTP session when TLS is shut down. We test for this by sending |
| 4222 | a new EHLO. If we don't get a good response, we don't attempt to pass |
| 4223 | the socket on. */ |
| 4224 | |
| 4225 | tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT); |
| 4226 | sx->cctx.tls_ctx = NULL; |
| 4227 | smtp_peer_options = smtp_peer_options_wrap; |
| 4228 | sx->ok = !sx->smtps |
| 4229 | && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data) |
| 4230 | >= 0 |
| 4231 | && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), |
| 4232 | '2', ob->command_timeout); |
| 4233 | |
| 4234 | if (sx->ok && f.continue_more) |
| 4235 | return yield; /* More addresses for another run */ |
| 4236 | } |
| 4237 | else |
| 4238 | { |
| 4239 | /* Set up a pipe for proxying TLS for the new transport process */ |
| 4240 | |
| 4241 | smtp_peer_options |= OPTION_TLS; |
| 4242 | if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0)) |
| 4243 | socket_fd = pfd[1]; |
| 4244 | else |
| 4245 | set_errno(sx->first_addr, errno, US"internal allocation problem", |
| 4246 | DEFER, FALSE, host, |
| 4247 | # ifdef EXPERIMENTAL_DSN_INFO |
| 4248 | sx->smtp_greeting, sx->helo_response, |
| 4249 | # endif |
| 4250 | &sx->delivery_start); |
| 4251 | } |
| 4252 | else |
| 4253 | #endif |
| 4254 | if (f.continue_more) |
| 4255 | return yield; /* More addresses for another run */ |
| 4256 | |
| 4257 | /* If the socket is successfully passed, we mustn't send QUIT (or |
| 4258 | indeed anything!) from here. */ |
| 4259 | |
| 4260 | /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to |
| 4261 | propagate it from the initial |
| 4262 | */ |
| 4263 | if (sx->ok && transport_pass_socket(tblock->name, host->name, |
| 4264 | host->address, new_message_id, socket_fd)) |
| 4265 | { |
| 4266 | sx->send_quit = FALSE; |
| 4267 | |
| 4268 | /* We have passed the client socket to a fresh transport process. |
| 4269 | If TLS is still active, we need to proxy it for the transport we |
| 4270 | just passed the baton to. Fork a child to to do it, and return to |
| 4271 | get logging done asap. Which way to place the work makes assumptions |
| 4272 | about post-fork prioritisation which may not hold on all platforms. */ |
| 4273 | #ifndef DISABLE_TLS |
| 4274 | if (tls_out.active.sock >= 0) |
| 4275 | { |
| 4276 | int pid = exim_fork(US"tls-proxy-interproc"); |
| 4277 | if (pid == 0) /* child; fork again to disconnect totally */ |
| 4278 | { |
| 4279 | /* does not return */ |
| 4280 | smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd, |
| 4281 | ob->command_timeout); |
| 4282 | } |
| 4283 | |
| 4284 | if (pid > 0) /* parent */ |
| 4285 | { |
| 4286 | close(pfd[0]); |
| 4287 | /* tidy the inter-proc to disconn the proxy proc */ |
| 4288 | waitpid(pid, NULL, 0); |
| 4289 | tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN); |
| 4290 | sx->cctx.tls_ctx = NULL; |
| 4291 | (void)close(sx->cctx.sock); |
| 4292 | sx->cctx.sock = -1; |
| 4293 | continue_transport = NULL; |
| 4294 | continue_hostname = NULL; |
| 4295 | return yield; |
| 4296 | } |
| 4297 | log_write(0, LOG_PANIC_DIE, "fork failed"); |
| 4298 | } |
| 4299 | #endif |
| 4300 | } |
| 4301 | } |
| 4302 | |
| 4303 | /* If RSET failed and there are addresses left, they get deferred. */ |
| 4304 | else |
| 4305 | set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host, |
| 4306 | #ifdef EXPERIMENTAL_DSN_INFO |
| 4307 | sx->smtp_greeting, sx->helo_response, |
| 4308 | #endif |
| 4309 | &sx->delivery_start); |
| 4310 | } |
| 4311 | } |
| 4312 | |
| 4313 | /* End off tidily with QUIT unless the connection has died or the socket has |
| 4314 | been passed to another process. There has been discussion on the net about what |
| 4315 | to do after sending QUIT. The wording of the RFC suggests that it is necessary |
| 4316 | to wait for a response, but on the other hand, there isn't anything one can do |
| 4317 | with an error response, other than log it. Exim used to do that. However, |
| 4318 | further discussion suggested that it is positively advantageous not to wait for |
| 4319 | the response, but to close the session immediately. This is supposed to move |
| 4320 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some |
| 4321 | load from the server. (Hosts that are both servers and clients may not see much |
| 4322 | difference, of course.) Further discussion indicated that this was safe to do |
| 4323 | on Unix systems which have decent implementations of TCP/IP that leave the |
| 4324 | connection around for a while (TIME_WAIT) after the application has gone away. |
| 4325 | This enables the response sent by the server to be properly ACKed rather than |
| 4326 | timed out, as can happen on broken TCP/IP implementations on other OS. |
| 4327 | |
| 4328 | This change is being made on 31-Jul-98. After over a year of trouble-free |
| 4329 | operation, the old commented-out code was removed on 17-Sep-99. */ |
| 4330 | |
| 4331 | SEND_QUIT: |
| 4332 | #ifdef TCP_CORK |
| 4333 | (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on)); |
| 4334 | #endif |
| 4335 | if (sx->send_quit) (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n"); |
| 4336 | |
| 4337 | END_OFF: |
| 4338 | |
| 4339 | #ifndef DISABLE_TLS |
| 4340 | tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT); |
| 4341 | sx->cctx.tls_ctx = NULL; |
| 4342 | #endif |
| 4343 | |
| 4344 | /* Close the socket, and return the appropriate value, first setting |
| 4345 | works because the NULL setting is passed back to the calling process, and |
| 4346 | remote_max_parallel is forced to 1 when delivering over an existing connection, |
| 4347 | |
| 4348 | If all went well and continue_more is set, we shouldn't actually get here if |
| 4349 | there are further addresses, as the return above will be taken. However, |
| 4350 | writing RSET might have failed, or there may be other addresses whose hosts are |
| 4351 | specified in the transports, and therefore not visible at top level, in which |
| 4352 | case continue_more won't get set. */ |
| 4353 | |
| 4354 | HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n"); |
| 4355 | if (sx->send_quit) |
| 4356 | { |
| 4357 | shutdown(sx->cctx.sock, SHUT_WR); |
| 4358 | millisleep(20); |
| 4359 | testharness_pause_ms(200); |
| 4360 | if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0) |
| 4361 | for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;) |
| 4362 | i--; /* drain socket */ |
| 4363 | } |
| 4364 | (void)close(sx->cctx.sock); |
| 4365 | |
| 4366 | #ifndef DISABLE_EVENT |
| 4367 | (void) event_raise(tblock->event_action, US"tcp:close", NULL); |
| 4368 | #endif |
| 4369 | |
| 4370 | continue_transport = NULL; |
| 4371 | continue_hostname = NULL; |
| 4372 | return yield; |
| 4373 | } |
| 4374 | |
| 4375 | |
| 4376 | |
| 4377 | |
| 4378 | /************************************************* |
| 4379 | * Closedown entry point * |
| 4380 | *************************************************/ |
| 4381 | |
| 4382 | /* This function is called when exim is passed an open smtp channel |
| 4383 | from another incarnation, but the message which it has been asked |
| 4384 | to deliver no longer exists. The channel is on stdin. |
| 4385 | |
| 4386 | We might do fancy things like looking for another message to send down |
| 4387 | the channel, but if the one we sought has gone, it has probably been |
| 4388 | delivered by some other process that itself will seek further messages, |
| 4389 | so just close down our connection. |
| 4390 | |
| 4391 | Argument: pointer to the transport instance block |
| 4392 | Returns: nothing |
| 4393 | */ |
| 4394 | |
| 4395 | void |
| 4396 | smtp_transport_closedown(transport_instance *tblock) |
| 4397 | { |
| 4398 | smtp_transport_options_block * ob = SOB tblock->options_block; |
| 4399 | client_conn_ctx cctx; |
| 4400 | smtp_context sx; |
| 4401 | uschar buffer[256]; |
| 4402 | uschar inbuffer[4096]; |
| 4403 | uschar outbuffer[16]; |
| 4404 | |
| 4405 | /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */ |
| 4406 | cctx.sock = fileno(stdin); |
| 4407 | cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL; |
| 4408 | |
| 4409 | sx.inblock.cctx = &cctx; |
| 4410 | sx.inblock.buffer = inbuffer; |
| 4411 | sx.inblock.buffersize = sizeof(inbuffer); |
| 4412 | sx.inblock.ptr = inbuffer; |
| 4413 | sx.inblock.ptrend = inbuffer; |
| 4414 | |
| 4415 | sx.outblock.cctx = &cctx; |
| 4416 | sx.outblock.buffersize = sizeof(outbuffer); |
| 4417 | sx.outblock.buffer = outbuffer; |
| 4418 | sx.outblock.ptr = outbuffer; |
| 4419 | sx.outblock.cmd_count = 0; |
| 4420 | sx.outblock.authenticating = FALSE; |
| 4421 | |
| 4422 | (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n"); |
| 4423 | (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout); |
| 4424 | (void)close(cctx.sock); |
| 4425 | } |
| 4426 | |
| 4427 | |
| 4428 | |
| 4429 | /************************************************* |
| 4430 | * Prepare addresses for delivery * |
| 4431 | *************************************************/ |
| 4432 | |
| 4433 | /* This function is called to flush out error settings from previous delivery |
| 4434 | attempts to other hosts. It also records whether we got here via an MX record |
| 4435 | or not in the more_errno field of the address. We are interested only in |
| 4436 | addresses that are still marked DEFER - others may have got delivered to a |
| 4437 | previously considered IP address. Set their status to PENDING_DEFER to indicate |
| 4438 | which ones are relevant this time. |
| 4439 | |
| 4440 | Arguments: |
| 4441 | addrlist the list of addresses |
| 4442 | host the host we are delivering to |
| 4443 | |
| 4444 | Returns: the first address for this delivery |
| 4445 | */ |
| 4446 | |
| 4447 | static address_item * |
| 4448 | prepare_addresses(address_item *addrlist, host_item *host) |
| 4449 | { |
| 4450 | address_item *first_addr = NULL; |
| 4451 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 4452 | if (addr->transport_return == DEFER) |
| 4453 | { |
| 4454 | if (!first_addr) first_addr = addr; |
| 4455 | addr->transport_return = PENDING_DEFER; |
| 4456 | addr->basic_errno = 0; |
| 4457 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; |
| 4458 | addr->message = NULL; |
| 4459 | #ifndef DISABLE_TLS |
| 4460 | addr->cipher = NULL; |
| 4461 | addr->ourcert = NULL; |
| 4462 | addr->peercert = NULL; |
| 4463 | addr->peerdn = NULL; |
| 4464 | addr->ocsp = OCSP_NOT_REQ; |
| 4465 | addr->tlsver = NULL; |
| 4466 | #endif |
| 4467 | #ifdef EXPERIMENTAL_DSN_INFO |
| 4468 | addr->smtp_greeting = NULL; |
| 4469 | addr->helo_response = NULL; |
| 4470 | #endif |
| 4471 | } |
| 4472 | return first_addr; |
| 4473 | } |
| 4474 | |
| 4475 | |
| 4476 | |
| 4477 | /************************************************* |
| 4478 | * Main entry point * |
| 4479 | *************************************************/ |
| 4480 | |
| 4481 | /* See local README for interface details. As this is a remote transport, it is |
| 4482 | given a chain of addresses to be delivered in one connection, if possible. It |
| 4483 | always returns TRUE, indicating that each address has its own independent |
| 4484 | status set, except if there is a setting up problem, in which case it returns |
| 4485 | FALSE. */ |
| 4486 | |
| 4487 | BOOL |
| 4488 | smtp_transport_entry( |
| 4489 | transport_instance *tblock, /* data for this instantiation */ |
| 4490 | address_item *addrlist) /* addresses we are working on */ |
| 4491 | { |
| 4492 | int defport; |
| 4493 | int hosts_defer = 0; |
| 4494 | int hosts_fail = 0; |
| 4495 | int hosts_looked_up = 0; |
| 4496 | int hosts_retry = 0; |
| 4497 | int hosts_serial = 0; |
| 4498 | int hosts_total = 0; |
| 4499 | int total_hosts_tried = 0; |
| 4500 | BOOL expired = TRUE; |
| 4501 | uschar *expanded_hosts = NULL; |
| 4502 | uschar *pistring; |
| 4503 | uschar *tid = string_sprintf("%s transport", tblock->name); |
| 4504 | smtp_transport_options_block *ob = SOB tblock->options_block; |
| 4505 | host_item *hostlist = addrlist->host_list; |
| 4506 | host_item *host = NULL; |
| 4507 | |
| 4508 | DEBUG(D_transport) |
| 4509 | { |
| 4510 | debug_printf("%s transport entered\n", tblock->name); |
| 4511 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 4512 | debug_printf(" %s\n", addr->address); |
| 4513 | if (hostlist) |
| 4514 | { |
| 4515 | debug_printf("hostlist:\n"); |
| 4516 | for (host_item * host = hostlist; host; host = host->next) |
| 4517 | debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port); |
| 4518 | } |
| 4519 | if (continue_hostname) |
| 4520 | debug_printf("already connected to %s [%s] (on fd %d)\n", |
| 4521 | continue_hostname, continue_host_address, |
| 4522 | cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0); |
| 4523 | } |
| 4524 | |
| 4525 | /* Set the flag requesting that these hosts be added to the waiting |
| 4526 | database if the delivery fails temporarily or if we are running with |
| 4527 | queue_smtp or a 2-stage queue run. This gets unset for certain |
| 4528 | kinds of error, typically those that are specific to the message. */ |
| 4529 | |
| 4530 | update_waiting = TRUE; |
| 4531 | |
| 4532 | /* If a host list is not defined for the addresses - they must all have the |
| 4533 | same one in order to be passed to a single transport - or if the transport has |
| 4534 | a host list with hosts_override set, use the host list supplied with the |
| 4535 | transport. It is an error for this not to exist. */ |
| 4536 | |
| 4537 | if (!hostlist || (ob->hosts_override && ob->hosts)) |
| 4538 | { |
| 4539 | if (!ob->hosts) |
| 4540 | { |
| 4541 | addrlist->message = string_sprintf("%s transport called with no hosts set", |
| 4542 | tblock->name); |
| 4543 | addrlist->transport_return = PANIC; |
| 4544 | return FALSE; /* Only top address has status */ |
| 4545 | } |
| 4546 | |
| 4547 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", |
| 4548 | ob->hosts); |
| 4549 | |
| 4550 | /* If the transport's host list contains no '$' characters, and we are not |
| 4551 | randomizing, it is fixed and therefore a chain of hosts can be built once |
| 4552 | and for all, and remembered for subsequent use by other calls to this |
| 4553 | transport. If, on the other hand, the host list does contain '$', or we are |
| 4554 | randomizing its order, we have to rebuild it each time. In the fixed case, |
| 4555 | as the hosts string will never be used again, it doesn't matter that we |
| 4556 | replace all the : characters with zeros. */ |
| 4557 | |
| 4558 | if (!ob->hostlist) |
| 4559 | { |
| 4560 | uschar *s = ob->hosts; |
| 4561 | |
| 4562 | if (Ustrchr(s, '$') != NULL) |
| 4563 | { |
| 4564 | if (!(expanded_hosts = expand_string(s))) |
| 4565 | { |
| 4566 | addrlist->message = string_sprintf("failed to expand list of hosts " |
| 4567 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); |
| 4568 | addrlist->transport_return = f.search_find_defer ? DEFER : PANIC; |
| 4569 | return FALSE; /* Only top address has status */ |
| 4570 | } |
| 4571 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " |
| 4572 | "\"%s\"\n", s, expanded_hosts); |
| 4573 | s = expanded_hosts; |
| 4574 | } |
| 4575 | else |
| 4576 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); |
| 4577 | |
| 4578 | if (is_tainted(s)) |
| 4579 | { |
| 4580 | log_write(0, LOG_MAIN|LOG_PANIC, |
| 4581 | "attempt to use tainted host list '%s' from '%s' in transport %s", |
| 4582 | s, ob->hosts, tblock->name); |
| 4583 | /* Avoid leaking info to an attacker */ |
| 4584 | addrlist->message = US"internal configuration error"; |
| 4585 | addrlist->transport_return = PANIC; |
| 4586 | return FALSE; |
| 4587 | } |
| 4588 | |
| 4589 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); |
| 4590 | |
| 4591 | /* Check that the expansion yielded something useful. */ |
| 4592 | if (!hostlist) |
| 4593 | { |
| 4594 | addrlist->message = |
| 4595 | string_sprintf("%s transport has empty hosts setting", tblock->name); |
| 4596 | addrlist->transport_return = PANIC; |
| 4597 | return FALSE; /* Only top address has status */ |
| 4598 | } |
| 4599 | |
| 4600 | /* If there was no expansion of hosts, save the host list for |
| 4601 | next time. */ |
| 4602 | |
| 4603 | if (!expanded_hosts) ob->hostlist = hostlist; |
| 4604 | } |
| 4605 | |
| 4606 | /* This is not the first time this transport has been run in this delivery; |
| 4607 | the host list was built previously. */ |
| 4608 | |
| 4609 | else |
| 4610 | hostlist = ob->hostlist; |
| 4611 | } |
| 4612 | |
| 4613 | /* The host list was supplied with the address. If hosts_randomize is set, we |
| 4614 | must sort it into a random order if it did not come from MX records and has not |
| 4615 | already been randomized (but don't bother if continuing down an existing |
| 4616 | connection). */ |
| 4617 | |
| 4618 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname) |
| 4619 | { |
| 4620 | host_item *newlist = NULL; |
| 4621 | while (hostlist) |
| 4622 | { |
| 4623 | host_item *h = hostlist; |
| 4624 | hostlist = hostlist->next; |
| 4625 | |
| 4626 | h->sort_key = random_number(100); |
| 4627 | |
| 4628 | if (!newlist) |
| 4629 | { |
| 4630 | h->next = NULL; |
| 4631 | newlist = h; |
| 4632 | } |
| 4633 | else if (h->sort_key < newlist->sort_key) |
| 4634 | { |
| 4635 | h->next = newlist; |
| 4636 | newlist = h; |
| 4637 | } |
| 4638 | else |
| 4639 | { |
| 4640 | host_item *hh = newlist; |
| 4641 | while (hh->next) |
| 4642 | { |
| 4643 | if (h->sort_key < hh->next->sort_key) break; |
| 4644 | hh = hh->next; |
| 4645 | } |
| 4646 | h->next = hh->next; |
| 4647 | hh->next = h; |
| 4648 | } |
| 4649 | } |
| 4650 | |
| 4651 | hostlist = addrlist->host_list = newlist; |
| 4652 | } |
| 4653 | |
| 4654 | /* Sort out the default port. */ |
| 4655 | |
| 4656 | if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE; |
| 4657 | |
| 4658 | /* For each host-plus-IP-address on the list: |
| 4659 | |
| 4660 | . If this is a continued delivery and the host isn't the one with the |
| 4661 | current connection, skip. |
| 4662 | |
| 4663 | . If the status is unusable (i.e. previously failed or retry checked), skip. |
| 4664 | |
| 4665 | . If no IP address set, get the address, either by turning the name into |
| 4666 | an address, calling gethostbyname if gethostbyname is on, or by calling |
| 4667 | the DNS. The DNS may yield multiple addresses, in which case insert the |
| 4668 | extra ones into the list. |
| 4669 | |
| 4670 | . Get the retry data if not previously obtained for this address and set the |
| 4671 | field which remembers the state of this address. Skip if the retry time is |
| 4672 | not reached. If not, remember whether retry data was found. The retry string |
| 4673 | contains both the name and the IP address. |
| 4674 | |
| 4675 | . Scan the list of addresses and mark those whose status is DEFER as |
| 4676 | PENDING_DEFER. These are the only ones that will be processed in this cycle |
| 4677 | of the hosts loop. |
| 4678 | |
| 4679 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. |
| 4680 | Some addresses may be successfully delivered, others may fail, and yet |
| 4681 | others may get temporary errors and so get marked DEFER. |
| 4682 | |
| 4683 | . The return from the delivery attempt is OK if a connection was made and a |
| 4684 | valid SMTP dialogue was completed. Otherwise it is DEFER. |
| 4685 | |
| 4686 | . If OK, add a "remove" retry item for this host/IPaddress, if any. |
| 4687 | |
| 4688 | . If fail to connect, or other defer state, add a retry item. |
| 4689 | |
| 4690 | . If there are any addresses whose status is still DEFER, carry on to the |
| 4691 | next host/IPaddress, unless we have tried the number of hosts given |
| 4692 | by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that |
| 4693 | there is some fancy logic for hosts_max_try that means its limit can be |
| 4694 | overstepped in some circumstances. |
| 4695 | |
| 4696 | If we get to the end of the list, all hosts have deferred at least one address, |
| 4697 | or not reached their retry times. If delay_after_cutoff is unset, it requests a |
| 4698 | delivery attempt to those hosts whose last try was before the arrival time of |
| 4699 | the current message. To cope with this, we have to go round the loop a second |
| 4700 | time. After that, set the status and error data for any addresses that haven't |
| 4701 | had it set already. */ |
| 4702 | |
| 4703 | for (int cutoff_retry = 0; |
| 4704 | expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2); |
| 4705 | cutoff_retry++) |
| 4706 | { |
| 4707 | host_item *nexthost = NULL; |
| 4708 | int unexpired_hosts_tried = 0; |
| 4709 | BOOL continue_host_tried = FALSE; |
| 4710 | |
| 4711 | retry_non_continued: |
| 4712 | for (host = hostlist; |
| 4713 | host |
| 4714 | && unexpired_hosts_tried < ob->hosts_max_try |
| 4715 | && total_hosts_tried < ob->hosts_max_try_hardlimit; |
| 4716 | host = nexthost) |
| 4717 | { |
| 4718 | int rc; |
| 4719 | int host_af; |
| 4720 | BOOL host_is_expired = FALSE; |
| 4721 | BOOL message_defer = FALSE; |
| 4722 | BOOL some_deferred = FALSE; |
| 4723 | address_item *first_addr = NULL; |
| 4724 | uschar *interface = NULL; |
| 4725 | uschar *retry_host_key = NULL; |
| 4726 | uschar *retry_message_key = NULL; |
| 4727 | uschar *serialize_key = NULL; |
| 4728 | |
| 4729 | /* Default next host is next host. :-) But this can vary if the |
| 4730 | hosts_max_try limit is hit (see below). It may also be reset if a host |
| 4731 | address is looked up here (in case the host was multihomed). */ |
| 4732 | |
| 4733 | nexthost = host->next; |
| 4734 | |
| 4735 | /* If the address hasn't yet been obtained from the host name, look it up |
| 4736 | now, unless the host is already marked as unusable. If it is marked as |
| 4737 | unusable, it means that the router was unable to find its IP address (in |
| 4738 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and |
| 4739 | the lookup failed last time. We don't get this far if *all* MX records |
| 4740 | point to non-existent hosts; that is treated as a hard error. |
| 4741 | |
| 4742 | We can just skip this host entirely. When the hosts came from the router, |
| 4743 | the address will timeout based on the other host(s); when the address is |
| 4744 | looked up below, there is an explicit retry record added. |
| 4745 | |
| 4746 | Note that we mustn't skip unusable hosts if the address is not unset; they |
| 4747 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ |
| 4748 | |
| 4749 | if (!host->address) |
| 4750 | { |
| 4751 | int new_port, flags; |
| 4752 | |
| 4753 | if (host->status >= hstatus_unusable) |
| 4754 | { |
| 4755 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", |
| 4756 | host->name); |
| 4757 | continue; |
| 4758 | } |
| 4759 | |
| 4760 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); |
| 4761 | |
| 4762 | /* The host name is permitted to have an attached port. Find it, and |
| 4763 | strip it from the name. Just remember it for now. */ |
| 4764 | |
| 4765 | new_port = host_item_get_port(host); |
| 4766 | |
| 4767 | /* Count hosts looked up */ |
| 4768 | |
| 4769 | hosts_looked_up++; |
| 4770 | |
| 4771 | /* Find by name if so configured, or if it's an IP address. We don't |
| 4772 | just copy the IP address, because we need the test-for-local to happen. */ |
| 4773 | |
| 4774 | flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA; |
| 4775 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; |
| 4776 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; |
| 4777 | |
| 4778 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0) |
| 4779 | rc = host_find_byname(host, NULL, flags, NULL, TRUE); |
| 4780 | else |
| 4781 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
| 4782 | &ob->dnssec, /* domains for request/require */ |
| 4783 | NULL, NULL); |
| 4784 | |
| 4785 | /* Update the host (and any additional blocks, resulting from |
| 4786 | multihoming) with a host-specific port, if any. */ |
| 4787 | |
| 4788 | for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port; |
| 4789 | |
| 4790 | /* Failure to find the host at this time (usually DNS temporary failure) |
| 4791 | is really a kind of routing failure rather than a transport failure. |
| 4792 | Therefore we add a retry item of the routing kind, not to stop us trying |
| 4793 | to look this name up here again, but to ensure the address gets timed |
| 4794 | out if the failures go on long enough. A complete failure at this point |
| 4795 | commonly points to a configuration error, but the best action is still |
| 4796 | to carry on for the next host. */ |
| 4797 | |
| 4798 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED) |
| 4799 | { |
| 4800 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); |
| 4801 | expired = FALSE; |
| 4802 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; |
| 4803 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? |
| 4804 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); |
| 4805 | host->status = hstatus_unusable; |
| 4806 | |
| 4807 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 4808 | { |
| 4809 | if (addr->transport_return != DEFER) continue; |
| 4810 | addr->basic_errno = ERRNO_UNKNOWNHOST; |
| 4811 | addr->message = string_sprintf( |
| 4812 | rc == HOST_FIND_SECURITY |
| 4813 | ? "lookup of IP address for %s was insecure" |
| 4814 | : "failed to lookup IP address for %s", |
| 4815 | host->name); |
| 4816 | } |
| 4817 | continue; |
| 4818 | } |
| 4819 | |
| 4820 | /* If the host is actually the local host, we may have a problem, or |
| 4821 | there may be some cunning configuration going on. In the problem case, |
| 4822 | log things and give up. The default transport status is already DEFER. */ |
| 4823 | |
| 4824 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) |
| 4825 | { |
| 4826 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 4827 | { |
| 4828 | addr->basic_errno = ERRNO_HOST_IS_LOCAL; |
| 4829 | addr->message = string_sprintf("%s transport found host %s to be " |
| 4830 | "local", tblock->name, host->name); |
| 4831 | } |
| 4832 | goto END_TRANSPORT; |
| 4833 | } |
| 4834 | } /* End of block for IP address lookup */ |
| 4835 | |
| 4836 | /* If this is a continued delivery, we are interested only in the host |
| 4837 | which matches the name of the existing open channel. The check is put |
| 4838 | here after the local host lookup, in case the name gets expanded as a |
| 4839 | result of the lookup. Set expired FALSE, to save the outer loop executing |
| 4840 | twice. */ |
| 4841 | |
| 4842 | if (continue_hostname) |
| 4843 | if ( Ustrcmp(continue_hostname, host->name) != 0 |
| 4844 | || Ustrcmp(continue_host_address, host->address) != 0 |
| 4845 | ) |
| 4846 | { |
| 4847 | expired = FALSE; |
| 4848 | continue; /* With next host */ |
| 4849 | } |
| 4850 | else |
| 4851 | continue_host_tried = TRUE; |
| 4852 | |
| 4853 | /* Reset the default next host in case a multihomed host whose addresses |
| 4854 | are not looked up till just above added to the host list. */ |
| 4855 | |
| 4856 | nexthost = host->next; |
| 4857 | |
| 4858 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the |
| 4859 | domain is in queue_smtp_domains, we don't actually want to attempt any |
| 4860 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If |
| 4861 | there is a lookup defer in queue_smtp_domains, proceed as if the domain |
| 4862 | were not in it. We don't want to hold up all SMTP deliveries! Except when |
| 4863 | doing a two-stage queue run, don't do this if forcing. */ |
| 4864 | |
| 4865 | if ( (!f.deliver_force || f.queue_2stage) |
| 4866 | && ( f.queue_smtp |
| 4867 | || match_isinlist(addrlist->domain, |
| 4868 | CUSS &queue_smtp_domains, 0, |
| 4869 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK) |
| 4870 | ) |
| 4871 | { |
| 4872 | DEBUG(D_transport) debug_printf("first-pass routing only\n"); |
| 4873 | expired = FALSE; |
| 4874 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 4875 | if (addr->transport_return == DEFER) |
| 4876 | addr->message = US"first-pass only routing due to -odqs, " |
| 4877 | "queue_smtp_domains or control=queue"; |
| 4878 | continue; /* With next host */ |
| 4879 | } |
| 4880 | |
| 4881 | /* Count hosts being considered - purely for an intelligent comment |
| 4882 | if none are usable. */ |
| 4883 | |
| 4884 | hosts_total++; |
| 4885 | |
| 4886 | /* Set $host and $host address now in case they are needed for the |
| 4887 | interface expansion or the serialize_hosts check; they remain set if an |
| 4888 | actual delivery happens. */ |
| 4889 | |
| 4890 | deliver_host = host->name; |
| 4891 | deliver_host_address = host->address; |
| 4892 | lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes" |
| 4893 | : host->dnssec == DS_NO ? US"no" |
| 4894 | : US""; |
| 4895 | |
| 4896 | /* Set up a string for adding to the retry key if the port number is not |
| 4897 | the standard SMTP port. A host may have its own port setting that overrides |
| 4898 | the default. */ |
| 4899 | |
| 4900 | pistring = string_sprintf(":%d", host->port == PORT_NONE |
| 4901 | ? defport : host->port); |
| 4902 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; |
| 4903 | |
| 4904 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface |
| 4905 | string is set, even if constant (as different transports can have different |
| 4906 | constant settings), we must add it to the key that is used for retries, |
| 4907 | because connections to the same host from a different interface should be |
| 4908 | treated separately. */ |
| 4909 | |
| 4910 | host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6; |
| 4911 | { |
| 4912 | uschar * s = ob->interface; |
| 4913 | if (s && *s) |
| 4914 | { |
| 4915 | if (!smtp_get_interface(s, host_af, addrlist, &interface, tid)) |
| 4916 | return FALSE; |
| 4917 | pistring = string_sprintf("%s/%s", pistring, interface); |
| 4918 | } |
| 4919 | } |
| 4920 | |
| 4921 | /* The first time round the outer loop, check the status of the host by |
| 4922 | inspecting the retry data. The second time round, we are interested only |
| 4923 | in expired hosts that haven't been tried since this message arrived. */ |
| 4924 | |
| 4925 | if (cutoff_retry == 0) |
| 4926 | { |
| 4927 | BOOL incl_ip; |
| 4928 | /* Ensure the status of the address is set by checking retry data if |
| 4929 | necessary. There may be host-specific retry data (applicable to all |
| 4930 | messages) and also data for retries of a specific message at this host. |
| 4931 | If either of these retry records are actually read, the keys used are |
| 4932 | returned to save recomputing them later. */ |
| 4933 | |
| 4934 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, |
| 4935 | US"retry_include_ip_address", ob->retry_include_ip_address, |
| 4936 | ob->expand_retry_include_ip_address, &incl_ip) != OK) |
| 4937 | continue; /* with next host */ |
| 4938 | |
| 4939 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, |
| 4940 | incl_ip, &retry_host_key, &retry_message_key); |
| 4941 | |
| 4942 | DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name, |
| 4943 | host->address ? host->address : US"", pistring, |
| 4944 | host->status == hstatus_usable ? "usable" |
| 4945 | : host->status == hstatus_unusable ? "unusable" |
| 4946 | : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?"); |
| 4947 | |
| 4948 | /* Skip this address if not usable at this time, noting if it wasn't |
| 4949 | actually expired, both locally and in the address. */ |
| 4950 | |
| 4951 | switch (host->status) |
| 4952 | { |
| 4953 | case hstatus_unusable: |
| 4954 | expired = FALSE; |
| 4955 | setflag(addrlist, af_retry_skipped); |
| 4956 | /* Fall through */ |
| 4957 | |
| 4958 | case hstatus_unusable_expired: |
| 4959 | switch (host->why) |
| 4960 | { |
| 4961 | case hwhy_retry: hosts_retry++; break; |
| 4962 | case hwhy_failed: hosts_fail++; break; |
| 4963 | case hwhy_insecure: |
| 4964 | case hwhy_deferred: hosts_defer++; break; |
| 4965 | } |
| 4966 | |
| 4967 | /* If there was a retry message key, implying that previously there |
| 4968 | was a message-specific defer, we don't want to update the list of |
| 4969 | messages waiting for these hosts. */ |
| 4970 | |
| 4971 | if (retry_message_key) update_waiting = FALSE; |
| 4972 | continue; /* With the next host or IP address */ |
| 4973 | } |
| 4974 | } |
| 4975 | |
| 4976 | /* Second time round the loop: if the address is set but expired, and |
| 4977 | the message is newer than the last try, let it through. */ |
| 4978 | |
| 4979 | else |
| 4980 | { |
| 4981 | if ( !host->address |
| 4982 | || host->status != hstatus_unusable_expired |
| 4983 | || host->last_try > received_time.tv_sec) |
| 4984 | continue; |
| 4985 | DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n", |
| 4986 | host->name, host->address, pistring); |
| 4987 | host_is_expired = TRUE; |
| 4988 | } |
| 4989 | |
| 4990 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; |
| 4991 | it remains TRUE only if all hosts are expired and none are actually tried. |
| 4992 | */ |
| 4993 | |
| 4994 | expired = FALSE; |
| 4995 | |
| 4996 | /* If this host is listed as one to which access must be serialized, |
| 4997 | see if another Exim process has a connection to it, and if so, skip |
| 4998 | this host. If not, update the database to record our connection to it |
| 4999 | and remember this for later deletion. Do not do any of this if we are |
| 5000 | sending the message down a pre-existing connection. */ |
| 5001 | |
| 5002 | if ( !continue_hostname |
| 5003 | && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK) |
| 5004 | { |
| 5005 | serialize_key = string_sprintf("host-serialize-%s", host->name); |
| 5006 | if (!enq_start(serialize_key, 1)) |
| 5007 | { |
| 5008 | DEBUG(D_transport) |
| 5009 | debug_printf("skipping host %s because another Exim process " |
| 5010 | "is connected to it\n", host->name); |
| 5011 | hosts_serial++; |
| 5012 | continue; |
| 5013 | } |
| 5014 | } |
| 5015 | |
| 5016 | /* OK, we have an IP address that is not waiting for its retry time to |
| 5017 | arrive (it might be expired) OR (second time round the loop) we have an |
| 5018 | expired host that hasn't been tried since the message arrived. Have a go |
| 5019 | at delivering the message to it. First prepare the addresses by flushing |
| 5020 | out the result of previous attempts, and finding the first address that |
| 5021 | is still to be delivered. */ |
| 5022 | |
| 5023 | first_addr = prepare_addresses(addrlist, host); |
| 5024 | |
| 5025 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", |
| 5026 | message_id, host->name, host->address, addrlist->address, |
| 5027 | addrlist->next ? ", ..." : ""); |
| 5028 | |
| 5029 | set_process_info("delivering %s to %s [%s]%s (%s%s)", |
| 5030 | message_id, host->name, host->address, pistring, addrlist->address, |
| 5031 | addrlist->next ? ", ..." : ""); |
| 5032 | |
| 5033 | /* This is not for real; don't do the delivery. If there are |
| 5034 | any remaining hosts, list them. */ |
| 5035 | |
| 5036 | if (f.dont_deliver) |
| 5037 | { |
| 5038 | struct timeval now; |
| 5039 | gettimeofday(&now, NULL); |
| 5040 | set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now); |
| 5041 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 5042 | { |
| 5043 | addr->host_used = host; |
| 5044 | addr->special_action = '*'; |
| 5045 | addr->message = US"delivery bypassed by -N option"; |
| 5046 | } |
| 5047 | DEBUG(D_transport) |
| 5048 | { |
| 5049 | debug_printf("*** delivery by %s transport bypassed by -N option\n" |
| 5050 | "*** host and remaining hosts:\n", tblock->name); |
| 5051 | for (host_item * host2 = host; host2; host2 = host2->next) |
| 5052 | debug_printf(" %s [%s]\n", host2->name, |
| 5053 | host2->address ? host2->address : US"unset"); |
| 5054 | } |
| 5055 | rc = OK; |
| 5056 | } |
| 5057 | |
| 5058 | /* This is for real. If the host is expired, we don't count it for |
| 5059 | hosts_max_retry. This ensures that all hosts must expire before an address |
| 5060 | is timed out, unless hosts_max_try_hardlimit (which protects against |
| 5061 | lunatic DNS configurations) is reached. |
| 5062 | |
| 5063 | If the host is not expired and we are about to hit the hosts_max_retry |
| 5064 | limit, check to see if there is a subsequent hosts with a different MX |
| 5065 | value. If so, make that the next host, and don't count this one. This is a |
| 5066 | heuristic to make sure that different MXs do get tried. With a normal kind |
| 5067 | of retry rule, they would get tried anyway when the earlier hosts were |
| 5068 | delayed, but if the domain has a "retry every time" type of rule - as is |
| 5069 | often used for the the very large ISPs, that won't happen. */ |
| 5070 | |
| 5071 | else |
| 5072 | { |
| 5073 | host_item * thost; |
| 5074 | /* Make a copy of the host if it is local to this invocation |
| 5075 | of the transport. */ |
| 5076 | |
| 5077 | if (expanded_hosts) |
| 5078 | { |
| 5079 | thost = store_get(sizeof(host_item), FALSE); |
| 5080 | *thost = *host; |
| 5081 | thost->name = string_copy(host->name); |
| 5082 | thost->address = string_copy(host->address); |
| 5083 | } |
| 5084 | else |
| 5085 | thost = host; |
| 5086 | |
| 5087 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) |
| 5088 | { |
| 5089 | DEBUG(D_transport) |
| 5090 | debug_printf("hosts_max_try limit reached with this host\n"); |
| 5091 | for (host_item * h = host; h; h = h->next) if (h->mx != host->mx) |
| 5092 | { |
| 5093 | nexthost = h; |
| 5094 | unexpired_hosts_tried--; |
| 5095 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " |
| 5096 | "and will be tried\n"); |
| 5097 | break; |
| 5098 | } |
| 5099 | } |
| 5100 | |
| 5101 | /* Attempt the delivery. */ |
| 5102 | |
| 5103 | total_hosts_tried++; |
| 5104 | rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock, |
| 5105 | &message_defer, FALSE); |
| 5106 | |
| 5107 | /* Yield is one of: |
| 5108 | OK => connection made, each address contains its result; |
| 5109 | message_defer is set for message-specific defers (when all |
| 5110 | recipients are marked defer) |
| 5111 | DEFER => there was a non-message-specific delivery problem; |
| 5112 | ERROR => there was a problem setting up the arguments for a filter, |
| 5113 | or there was a problem with expanding added headers |
| 5114 | */ |
| 5115 | |
| 5116 | /* If the result is not OK, there was a non-message-specific problem. |
| 5117 | If the result is DEFER, we need to write to the logs saying what happened |
| 5118 | for this particular host, except in the case of authentication and TLS |
| 5119 | failures, where the log has already been written. If all hosts defer a |
| 5120 | general message is written at the end. */ |
| 5121 | |
| 5122 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL |
| 5123 | && first_addr->basic_errno != ERRNO_TLSFAILURE) |
| 5124 | write_logs(host, first_addr->message, first_addr->basic_errno); |
| 5125 | |
| 5126 | #ifndef DISABLE_EVENT |
| 5127 | if (rc == DEFER) |
| 5128 | deferred_event_raise(first_addr, host, US"msg:host:defer"); |
| 5129 | #endif |
| 5130 | |
| 5131 | /* If STARTTLS was accepted, but there was a failure in setting up the |
| 5132 | TLS session (usually a certificate screwup), and the host is not in |
| 5133 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with |
| 5134 | TLS forcibly turned off. We have to start from scratch with a new SMTP |
| 5135 | connection. That's why the retry is done from here, not from within |
| 5136 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the |
| 5137 | session, so the in-clear transmission after those errors, if permitted, |
| 5138 | happens inside smtp_deliver().] */ |
| 5139 | |
| 5140 | #ifndef DISABLE_TLS |
| 5141 | if ( rc == DEFER |
| 5142 | && first_addr->basic_errno == ERRNO_TLSFAILURE |
| 5143 | && ob->tls_tempfail_tryclear |
| 5144 | && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK |
| 5145 | ) |
| 5146 | { |
| 5147 | log_write(0, LOG_MAIN, |
| 5148 | "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)", |
| 5149 | first_addr->message, host->name, host->address); |
| 5150 | first_addr = prepare_addresses(addrlist, host); |
| 5151 | rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock, |
| 5152 | &message_defer, TRUE); |
| 5153 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) |
| 5154 | write_logs(host, first_addr->message, first_addr->basic_errno); |
| 5155 | # ifndef DISABLE_EVENT |
| 5156 | if (rc == DEFER) |
| 5157 | deferred_event_raise(first_addr, host, US"msg:host:defer"); |
| 5158 | # endif |
| 5159 | } |
| 5160 | #endif /*DISABLE_TLS*/ |
| 5161 | |
| 5162 | #ifndef DISABLE_EVENT |
| 5163 | /* If the last host gave a defer raise a per-message event */ |
| 5164 | |
| 5165 | if (!nexthost && (message_defer || rc == DEFER)) |
| 5166 | deferred_event_raise(first_addr, host, US"msg:defer"); |
| 5167 | #endif |
| 5168 | } |
| 5169 | |
| 5170 | /* Delivery attempt finished */ |
| 5171 | |
| 5172 | set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s", |
| 5173 | message_id, host->name, host->address, pistring, addrlist->address, |
| 5174 | addrlist->next ? " (& others)" : "", rc_to_string(rc)); |
| 5175 | |
| 5176 | /* Release serialization if set up */ |
| 5177 | |
| 5178 | if (serialize_key) enq_end(serialize_key); |
| 5179 | |
| 5180 | /* If the result is DEFER, or if a host retry record is known to exist, we |
| 5181 | need to add an item to the retry chain for updating the retry database |
| 5182 | at the end of delivery. We only need to add the item to the top address, |
| 5183 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it |
| 5184 | for any other delivery attempts using the same address. (It is copied into |
| 5185 | the unusable tree at the outer level, so even if different address blocks |
| 5186 | contain the same address, it still won't get tried again.) */ |
| 5187 | |
| 5188 | if (rc == DEFER || retry_host_key) |
| 5189 | { |
| 5190 | int delete_flag = rc != DEFER ? rf_delete : 0; |
| 5191 | if (!retry_host_key) |
| 5192 | { |
| 5193 | BOOL incl_ip; |
| 5194 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, |
| 5195 | US"retry_include_ip_address", ob->retry_include_ip_address, |
| 5196 | ob->expand_retry_include_ip_address, &incl_ip) != OK) |
| 5197 | incl_ip = TRUE; /* error; use most-specific retry record */ |
| 5198 | |
| 5199 | retry_host_key = incl_ip |
| 5200 | ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring) |
| 5201 | : string_sprintf("T:%S%s", host->name, pistring); |
| 5202 | } |
| 5203 | |
| 5204 | /* If a delivery of another message over an existing SMTP connection |
| 5205 | yields DEFER, we do NOT set up retry data for the host. This covers the |
| 5206 | case when there are delays in routing the addresses in the second message |
| 5207 | that are so long that the server times out. This is alleviated by not |
| 5208 | routing addresses that previously had routing defers when handling an |
| 5209 | existing connection, but even so, this case may occur (e.g. if a |
| 5210 | previously happily routed address starts giving routing defers). If the |
| 5211 | host is genuinely down, another non-continued message delivery will |
| 5212 | notice it soon enough. */ |
| 5213 | |
| 5214 | if (delete_flag != 0 || !continue_hostname) |
| 5215 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); |
| 5216 | |
| 5217 | /* We may have tried an expired host, if its retry time has come; ensure |
| 5218 | the status reflects the expiry for the benefit of any other addresses. */ |
| 5219 | |
| 5220 | if (rc == DEFER) |
| 5221 | { |
| 5222 | host->status = host_is_expired |
| 5223 | ? hstatus_unusable_expired : hstatus_unusable; |
| 5224 | host->why = hwhy_deferred; |
| 5225 | } |
| 5226 | } |
| 5227 | |
| 5228 | /* If message_defer is set (host was OK, but every recipient got deferred |
| 5229 | because of some message-specific problem), or if that had happened |
| 5230 | previously so that a message retry key exists, add an appropriate item |
| 5231 | to the retry chain. Note that if there was a message defer but now there is |
| 5232 | a host defer, the message defer record gets deleted. That seems perfectly |
| 5233 | reasonable. Also, stop the message from being remembered as waiting |
| 5234 | for specific hosts. */ |
| 5235 | |
| 5236 | if (message_defer || retry_message_key) |
| 5237 | { |
| 5238 | int delete_flag = message_defer ? 0 : rf_delete; |
| 5239 | if (!retry_message_key) |
| 5240 | { |
| 5241 | BOOL incl_ip; |
| 5242 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, |
| 5243 | US"retry_include_ip_address", ob->retry_include_ip_address, |
| 5244 | ob->expand_retry_include_ip_address, &incl_ip) != OK) |
| 5245 | incl_ip = TRUE; /* error; use most-specific retry record */ |
| 5246 | |
| 5247 | retry_message_key = incl_ip |
| 5248 | ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, |
| 5249 | message_id) |
| 5250 | : string_sprintf("T:%S%s:%s", host->name, pistring, message_id); |
| 5251 | } |
| 5252 | retry_add_item(addrlist, retry_message_key, |
| 5253 | rf_message | rf_host | delete_flag); |
| 5254 | update_waiting = FALSE; |
| 5255 | } |
| 5256 | |
| 5257 | /* Any return other than DEFER (that is, OK or ERROR) means that the |
| 5258 | addresses have got their final statuses filled in for this host. In the OK |
| 5259 | case, see if any of them are deferred. */ |
| 5260 | |
| 5261 | if (rc == OK) |
| 5262 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 5263 | if (addr->transport_return == DEFER) |
| 5264 | { |
| 5265 | some_deferred = TRUE; |
| 5266 | break; |
| 5267 | } |
| 5268 | |
| 5269 | /* If no addresses deferred or the result was ERROR, return. We do this for |
| 5270 | ERROR because a failing filter set-up or add_headers expansion is likely to |
| 5271 | fail for any host we try. */ |
| 5272 | |
| 5273 | if (rc == ERROR || (rc == OK && !some_deferred)) |
| 5274 | { |
| 5275 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); |
| 5276 | return TRUE; /* Each address has its status */ |
| 5277 | } |
| 5278 | |
| 5279 | /* If the result was DEFER or some individual addresses deferred, let |
| 5280 | the loop run to try other hosts with the deferred addresses, except for the |
| 5281 | case when we were trying to deliver down an existing channel and failed. |
| 5282 | Don't try any other hosts in this case. */ |
| 5283 | |
| 5284 | if (continue_hostname) break; |
| 5285 | |
| 5286 | /* If the whole delivery, or some individual addresses, were deferred and |
| 5287 | there are more hosts that could be tried, do not count this host towards |
| 5288 | the hosts_max_try limit if the age of the message is greater than the |
| 5289 | maximum retry time for this host. This means we may try try all hosts, |
| 5290 | ignoring the limit, when messages have been around for some time. This is |
| 5291 | important because if we don't try all hosts, the address will never time |
| 5292 | out. NOTE: this does not apply to hosts_max_try_hardlimit. */ |
| 5293 | |
| 5294 | if ((rc == DEFER || some_deferred) && nexthost) |
| 5295 | { |
| 5296 | BOOL timedout; |
| 5297 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); |
| 5298 | |
| 5299 | if (retry && retry->rules) |
| 5300 | { |
| 5301 | retry_rule *last_rule; |
| 5302 | for (last_rule = retry->rules; |
| 5303 | last_rule->next; |
| 5304 | last_rule = last_rule->next); |
| 5305 | timedout = time(NULL) - received_time.tv_sec > last_rule->timeout; |
| 5306 | } |
| 5307 | else timedout = TRUE; /* No rule => timed out */ |
| 5308 | |
| 5309 | if (timedout) |
| 5310 | { |
| 5311 | unexpired_hosts_tried--; |
| 5312 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " |
| 5313 | "hosts_max_try (message older than host's retry time)\n"); |
| 5314 | } |
| 5315 | } |
| 5316 | |
| 5317 | DEBUG(D_transport) |
| 5318 | { |
| 5319 | if (unexpired_hosts_tried >= ob->hosts_max_try) |
| 5320 | debug_printf("reached transport hosts_max_try limit %d\n", |
| 5321 | ob->hosts_max_try); |
| 5322 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
| 5323 | debug_printf("reached transport hosts_max_try_hardlimit limit %d\n", |
| 5324 | ob->hosts_max_try_hardlimit); |
| 5325 | } |
| 5326 | |
| 5327 | testharness_pause_ms(500); /* let server debug out */ |
| 5328 | } /* End of loop for trying multiple hosts. */ |
| 5329 | |
| 5330 | /* If we failed to find a matching host in the list, for an already-open |
| 5331 | connection, just close it and start over with the list. This can happen |
| 5332 | for routing that changes from run to run, or big multi-IP sites with |
| 5333 | round-robin DNS. */ |
| 5334 | |
| 5335 | if (continue_hostname && !continue_host_tried) |
| 5336 | { |
| 5337 | int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0; |
| 5338 | |
| 5339 | DEBUG(D_transport) debug_printf("no hosts match already-open connection\n"); |
| 5340 | #ifndef DISABLE_TLS |
| 5341 | /* A TLS conn could be open for a cutthrough, but not for a plain continued- |
| 5342 | transport */ |
| 5343 | /*XXX doublecheck that! */ |
| 5344 | |
| 5345 | if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls) |
| 5346 | { |
| 5347 | (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE); |
| 5348 | tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT); |
| 5349 | cutthrough.cctx.tls_ctx = NULL; |
| 5350 | cutthrough.is_tls = FALSE; |
| 5351 | } |
| 5352 | else |
| 5353 | #else |
| 5354 | (void) write(fd, US"QUIT\r\n", 6); |
| 5355 | #endif |
| 5356 | (void) close(fd); |
| 5357 | cutthrough.cctx.sock = -1; |
| 5358 | continue_hostname = NULL; |
| 5359 | goto retry_non_continued; |
| 5360 | } |
| 5361 | |
| 5362 | /* This is the end of the loop that repeats iff expired is TRUE and |
| 5363 | ob->delay_after_cutoff is FALSE. The second time round we will |
| 5364 | try those hosts that haven't been tried since the message arrived. */ |
| 5365 | |
| 5366 | DEBUG(D_transport) |
| 5367 | { |
| 5368 | debug_printf("all IP addresses skipped or deferred at least one address\n"); |
| 5369 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) |
| 5370 | debug_printf("retrying IP addresses not tried since message arrived\n"); |
| 5371 | } |
| 5372 | } |
| 5373 | |
| 5374 | |
| 5375 | /* Get here if all IP addresses are skipped or defer at least one address. In |
| 5376 | MUA wrapper mode, this will happen only for connection or other non-message- |
| 5377 | specific failures. Force the delivery status for all addresses to FAIL. */ |
| 5378 | |
| 5379 | if (mua_wrapper) |
| 5380 | { |
| 5381 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 5382 | addr->transport_return = FAIL; |
| 5383 | goto END_TRANSPORT; |
| 5384 | } |
| 5385 | |
| 5386 | /* In the normal, non-wrapper case, add a standard message to each deferred |
| 5387 | address if there hasn't been an error, that is, if it hasn't actually been |
| 5388 | tried this time. The variable "expired" will be FALSE if any deliveries were |
| 5389 | actually tried, or if there was at least one host that was not expired. That |
| 5390 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If |
| 5391 | a delivery has been tried, an error code will be set, and the failing of the |
| 5392 | message is handled by the retry code later. |
| 5393 | |
| 5394 | If queue_smtp is set, or this transport was called to send a subsequent message |
| 5395 | down an existing TCP/IP connection, and something caused the host not to be |
| 5396 | found, we end up here, but can detect these cases and handle them specially. */ |
| 5397 | |
| 5398 | for (address_item * addr = addrlist; addr; addr = addr->next) |
| 5399 | { |
| 5400 | /* If host is not NULL, it means that we stopped processing the host list |
| 5401 | because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this |
| 5402 | means we need to behave as if some hosts were skipped because their retry |
| 5403 | time had not come. Specifically, this prevents the address from timing out. |
| 5404 | However, if we have hit hosts_max_try_hardlimit, we want to behave as if all |
| 5405 | hosts were tried. */ |
| 5406 | |
| 5407 | if (host) |
| 5408 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
| 5409 | { |
| 5410 | DEBUG(D_transport) |
| 5411 | debug_printf("hosts_max_try_hardlimit reached: behave as if all " |
| 5412 | "hosts were tried\n"); |
| 5413 | } |
| 5414 | else |
| 5415 | { |
| 5416 | DEBUG(D_transport) |
| 5417 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); |
| 5418 | setflag(addr, af_retry_skipped); |
| 5419 | } |
| 5420 | |
| 5421 | if (f.queue_smtp) /* no deliveries attempted */ |
| 5422 | { |
| 5423 | addr->transport_return = DEFER; |
| 5424 | addr->basic_errno = 0; |
| 5425 | addr->message = US"SMTP delivery explicitly queued"; |
| 5426 | } |
| 5427 | |
| 5428 | else if ( addr->transport_return == DEFER |
| 5429 | && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) |
| 5430 | && !addr->message |
| 5431 | ) |
| 5432 | { |
| 5433 | addr->basic_errno = ERRNO_HRETRY; |
| 5434 | if (continue_hostname) |
| 5435 | addr->message = US"no host found for existing SMTP connection"; |
| 5436 | else if (expired) |
| 5437 | { |
| 5438 | setflag(addr, af_pass_message); /* This is not a security risk */ |
| 5439 | addr->message = string_sprintf( |
| 5440 | "all hosts%s have been failing for a long time %s", |
| 5441 | addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"", |
| 5442 | ob->delay_after_cutoff |
| 5443 | ? US"(and retry time not reached)" |
| 5444 | : US"and were last tried after this message arrived"); |
| 5445 | |
| 5446 | /* If we are already using fallback hosts, or there are no fallback hosts |
| 5447 | defined, convert the result to FAIL to cause a bounce. */ |
| 5448 | |
| 5449 | if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts) |
| 5450 | addr->transport_return = FAIL; |
| 5451 | } |
| 5452 | else |
| 5453 | { |
| 5454 | const char * s; |
| 5455 | if (hosts_retry == hosts_total) |
| 5456 | s = "retry time not reached for any host%s"; |
| 5457 | else if (hosts_fail == hosts_total) |
| 5458 | s = "all host address lookups%s failed permanently"; |
| 5459 | else if (hosts_defer == hosts_total) |
| 5460 | s = "all host address lookups%s failed temporarily"; |
| 5461 | else if (hosts_serial == hosts_total) |
| 5462 | s = "connection limit reached for all hosts%s"; |
| 5463 | else if (hosts_fail+hosts_defer == hosts_total) |
| 5464 | s = "all host address lookups%s failed"; |
| 5465 | else |
| 5466 | s = "some host address lookups failed and retry time " |
| 5467 | "not reached for other hosts or connection limit reached%s"; |
| 5468 | |
| 5469 | addr->message = string_sprintf(s, |
| 5470 | addr->domain ? string_sprintf(" for '%s'", addr->domain) : US""); |
| 5471 | } |
| 5472 | } |
| 5473 | } |
| 5474 | |
| 5475 | /* Update the database which keeps information about which messages are waiting |
| 5476 | for which hosts to become available. For some message-specific errors, the |
| 5477 | update_waiting flag is turned off because we don't want follow-on deliveries in |
| 5478 | those cases. If this transport instance is explicitly limited to one message |
| 5479 | per connection then follow-on deliveries are not possible and there's no need |
| 5480 | to create/update the per-transport wait-<transport_name> database. */ |
| 5481 | |
| 5482 | if (update_waiting && tblock->connection_max_messages != 1) |
| 5483 | transport_update_waiting(hostlist, tblock->name); |
| 5484 | |
| 5485 | END_TRANSPORT: |
| 5486 | |
| 5487 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); |
| 5488 | |
| 5489 | return TRUE; /* Each address has its status */ |
| 5490 | } |
| 5491 | |
| 5492 | #endif /*!MACRO_PREDEF*/ |
| 5493 | /* vi: aw ai sw=2 |
| 5494 | */ |
| 5495 | /* End of transport/smtp.c */ |