| 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 | /* General functions concerned with transportation, and generic options for all |
| 9 | transports. */ |
| 10 | |
| 11 | |
| 12 | #include "exim.h" |
| 13 | |
| 14 | /* Generic options for transports, all of which live inside transport_instance |
| 15 | data blocks and which therefore have the opt_public flag set. Note that there |
| 16 | are other options living inside this structure which can be set only from |
| 17 | certain transports. */ |
| 18 | |
| 19 | optionlist optionlist_transports[] = { |
| 20 | /* name type value */ |
| 21 | { "*expand_group", opt_stringptr|opt_hidden|opt_public, |
| 22 | (void *)offsetof(transport_instance, expand_gid) }, |
| 23 | { "*expand_user", opt_stringptr|opt_hidden|opt_public, |
| 24 | (void *)offsetof(transport_instance, expand_uid) }, |
| 25 | { "*headers_rewrite_flags", opt_int|opt_public|opt_hidden, |
| 26 | (void *)offsetof(transport_instance, rewrite_existflags) }, |
| 27 | { "*headers_rewrite_rules", opt_void|opt_public|opt_hidden, |
| 28 | (void *)offsetof(transport_instance, rewrite_rules) }, |
| 29 | { "*set_group", opt_bool|opt_hidden|opt_public, |
| 30 | (void *)offsetof(transport_instance, gid_set) }, |
| 31 | { "*set_user", opt_bool|opt_hidden|opt_public, |
| 32 | (void *)offsetof(transport_instance, uid_set) }, |
| 33 | { "body_only", opt_bool|opt_public, |
| 34 | (void *)offsetof(transport_instance, body_only) }, |
| 35 | { "current_directory", opt_stringptr|opt_public, |
| 36 | (void *)offsetof(transport_instance, current_dir) }, |
| 37 | { "debug_print", opt_stringptr | opt_public, |
| 38 | (void *)offsetof(transport_instance, debug_string) }, |
| 39 | { "delivery_date_add", opt_bool|opt_public, |
| 40 | (void *)(offsetof(transport_instance, delivery_date_add)) }, |
| 41 | { "disable_logging", opt_bool|opt_public, |
| 42 | (void *)(offsetof(transport_instance, disable_logging)) }, |
| 43 | { "driver", opt_stringptr|opt_public, |
| 44 | (void *)offsetof(transport_instance, driver_name) }, |
| 45 | { "envelope_to_add", opt_bool|opt_public, |
| 46 | (void *)(offsetof(transport_instance, envelope_to_add)) }, |
| 47 | #ifndef DISABLE_EVENT |
| 48 | { "event_action", opt_stringptr | opt_public, |
| 49 | (void *)offsetof(transport_instance, event_action) }, |
| 50 | #endif |
| 51 | { "group", opt_expand_gid|opt_public, |
| 52 | (void *)offsetof(transport_instance, gid) }, |
| 53 | { "headers_add", opt_stringptr|opt_public|opt_rep_str, |
| 54 | (void *)offsetof(transport_instance, add_headers) }, |
| 55 | { "headers_only", opt_bool|opt_public, |
| 56 | (void *)offsetof(transport_instance, headers_only) }, |
| 57 | { "headers_remove", opt_stringptr|opt_public|opt_rep_str, |
| 58 | (void *)offsetof(transport_instance, remove_headers) }, |
| 59 | { "headers_rewrite", opt_rewrite|opt_public, |
| 60 | (void *)offsetof(transport_instance, headers_rewrite) }, |
| 61 | { "home_directory", opt_stringptr|opt_public, |
| 62 | (void *)offsetof(transport_instance, home_dir) }, |
| 63 | { "initgroups", opt_bool|opt_public, |
| 64 | (void *)offsetof(transport_instance, initgroups) }, |
| 65 | { "max_parallel", opt_stringptr|opt_public, |
| 66 | (void *)offsetof(transport_instance, max_parallel) }, |
| 67 | { "message_size_limit", opt_stringptr|opt_public, |
| 68 | (void *)offsetof(transport_instance, message_size_limit) }, |
| 69 | { "rcpt_include_affixes", opt_bool|opt_public, |
| 70 | (void *)offsetof(transport_instance, rcpt_include_affixes) }, |
| 71 | { "retry_use_local_part", opt_bool|opt_public, |
| 72 | (void *)offsetof(transport_instance, retry_use_local_part) }, |
| 73 | { "return_path", opt_stringptr|opt_public, |
| 74 | (void *)(offsetof(transport_instance, return_path)) }, |
| 75 | { "return_path_add", opt_bool|opt_public, |
| 76 | (void *)(offsetof(transport_instance, return_path_add)) }, |
| 77 | { "shadow_condition", opt_stringptr|opt_public, |
| 78 | (void *)offsetof(transport_instance, shadow_condition) }, |
| 79 | { "shadow_transport", opt_stringptr|opt_public, |
| 80 | (void *)offsetof(transport_instance, shadow) }, |
| 81 | { "transport_filter", opt_stringptr|opt_public, |
| 82 | (void *)offsetof(transport_instance, filter_command) }, |
| 83 | { "transport_filter_timeout", opt_time|opt_public, |
| 84 | (void *)offsetof(transport_instance, filter_timeout) }, |
| 85 | { "user", opt_expand_uid|opt_public, |
| 86 | (void *)offsetof(transport_instance, uid) } |
| 87 | }; |
| 88 | |
| 89 | int optionlist_transports_size = nelem(optionlist_transports); |
| 90 | |
| 91 | #ifdef MACRO_PREDEF |
| 92 | |
| 93 | # include "macro_predef.h" |
| 94 | |
| 95 | void |
| 96 | options_transports(void) |
| 97 | { |
| 98 | uschar buf[64]; |
| 99 | |
| 100 | options_from_list(optionlist_transports, nelem(optionlist_transports), US"TRANSPORTS", NULL); |
| 101 | |
| 102 | for (transport_info * ti = transports_available; ti->driver_name[0]; ti++) |
| 103 | { |
| 104 | spf(buf, sizeof(buf), US"_DRIVER_TRANSPORT_%T", ti->driver_name); |
| 105 | builtin_macro_create(buf); |
| 106 | options_from_list(ti->options, (unsigned)*ti->options_count, US"TRANSPORT", ti->driver_name); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | #else /*!MACRO_PREDEF*/ |
| 111 | |
| 112 | /* Structure for keeping list of addresses that have been added to |
| 113 | Envelope-To:, in order to avoid duplication. */ |
| 114 | |
| 115 | struct aci { |
| 116 | struct aci *next; |
| 117 | address_item *ptr; |
| 118 | }; |
| 119 | |
| 120 | |
| 121 | /* Static data for write_chunk() */ |
| 122 | |
| 123 | static uschar *chunk_ptr; /* chunk pointer */ |
| 124 | static uschar *nl_check; /* string to look for at line start */ |
| 125 | static int nl_check_length; /* length of same */ |
| 126 | static uschar *nl_escape; /* string to insert */ |
| 127 | static int nl_escape_length; /* length of same */ |
| 128 | static int nl_partial_match; /* length matched at chunk end */ |
| 129 | |
| 130 | |
| 131 | /************************************************* |
| 132 | * Initialize transport list * |
| 133 | *************************************************/ |
| 134 | |
| 135 | /* Read the transports section of the configuration file, and set up a chain of |
| 136 | transport instances according to its contents. Each transport has generic |
| 137 | options and may also have its own private options. This function is only ever |
| 138 | called when transports == NULL. We use generic code in readconf to do most of |
| 139 | the work. */ |
| 140 | |
| 141 | void |
| 142 | transport_init(void) |
| 143 | { |
| 144 | readconf_driver_init(US"transport", |
| 145 | (driver_instance **)(&transports), /* chain anchor */ |
| 146 | (driver_info *)transports_available, /* available drivers */ |
| 147 | sizeof(transport_info), /* size of info block */ |
| 148 | &transport_defaults, /* default values for generic options */ |
| 149 | sizeof(transport_instance), /* size of instance block */ |
| 150 | optionlist_transports, /* generic options */ |
| 151 | optionlist_transports_size); |
| 152 | |
| 153 | /* Now scan the configured transports and check inconsistencies. A shadow |
| 154 | transport is permitted only for local transports. */ |
| 155 | |
| 156 | for (transport_instance * t = transports; t; t = t->next) |
| 157 | { |
| 158 | if (!t->info->local && t->shadow) |
| 159 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, |
| 160 | "shadow transport not allowed on non-local transport %s", t->name); |
| 161 | |
| 162 | if (t->body_only && t->headers_only) |
| 163 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, |
| 164 | "%s transport: body_only and headers_only are mutually exclusive", |
| 165 | t->name); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | |
| 170 | |
| 171 | /************************************************* |
| 172 | * Write block of data * |
| 173 | *************************************************/ |
| 174 | |
| 175 | /* Subroutine called by write_chunk() and at the end of the message actually |
| 176 | to write a data block. Also called directly by some transports to write |
| 177 | additional data to the file descriptor (e.g. prefix, suffix). |
| 178 | |
| 179 | If a transport wants data transfers to be timed, it sets a non-zero value in |
| 180 | transport_write_timeout. A non-zero transport_write_timeout causes a timer to |
| 181 | be set for each block of data written from here. If time runs out, then write() |
| 182 | fails and provokes an error return. The caller can then inspect sigalrm_seen to |
| 183 | check for a timeout. |
| 184 | |
| 185 | On some systems, if a quota is exceeded during the write, the yield is the |
| 186 | number of bytes written rather than an immediate error code. This also happens |
| 187 | on some systems in other cases, for example a pipe that goes away because the |
| 188 | other end's process terminates (Linux). On other systems, (e.g. Solaris 2) you |
| 189 | get the error codes the first time. |
| 190 | |
| 191 | The write() function is also interruptible; the Solaris 2.6 man page says: |
| 192 | |
| 193 | If write() is interrupted by a signal before it writes any |
| 194 | data, it will return -1 with errno set to EINTR. |
| 195 | |
| 196 | If write() is interrupted by a signal after it successfully |
| 197 | writes some data, it will return the number of bytes written. |
| 198 | |
| 199 | To handle these cases, we want to restart the write() to output the remainder |
| 200 | of the data after a non-negative return from write(), except after a timeout. |
| 201 | In the error cases (EDQUOT, EPIPE) no bytes get written the second time, and a |
| 202 | proper error then occurs. In principle, after an interruption, the second |
| 203 | write() could suffer the same fate, but we do not want to continue for |
| 204 | evermore, so stick a maximum repetition count on the loop to act as a |
| 205 | longstop. |
| 206 | |
| 207 | Arguments: |
| 208 | tctx transport context: file descriptor or string to write to |
| 209 | block block of bytes to write |
| 210 | len number of bytes to write |
| 211 | more further data expected soon |
| 212 | |
| 213 | Returns: TRUE on success, FALSE on failure (with errno preserved); |
| 214 | transport_count is incremented by the number of bytes written |
| 215 | */ |
| 216 | |
| 217 | static BOOL |
| 218 | transport_write_block_fd(transport_ctx * tctx, uschar *block, int len, BOOL more) |
| 219 | { |
| 220 | int rc, save_errno; |
| 221 | int local_timeout = transport_write_timeout; |
| 222 | int fd = tctx->u.fd; |
| 223 | |
| 224 | /* This loop is for handling incomplete writes and other retries. In most |
| 225 | normal cases, it is only ever executed once. */ |
| 226 | |
| 227 | for (int i = 0; i < 100; i++) |
| 228 | { |
| 229 | DEBUG(D_transport) |
| 230 | debug_printf("writing data block fd=%d size=%d timeout=%d%s\n", |
| 231 | fd, len, local_timeout, more ? " (more expected)" : ""); |
| 232 | |
| 233 | /* This code makes use of alarm() in order to implement the timeout. This |
| 234 | isn't a very tidy way of doing things. Using non-blocking I/O with select() |
| 235 | provides a neater approach. However, I don't know how to do this when TLS is |
| 236 | in use. */ |
| 237 | |
| 238 | if (transport_write_timeout <= 0) /* No timeout wanted */ |
| 239 | { |
| 240 | rc = |
| 241 | #ifndef DISABLE_TLS |
| 242 | tls_out.active.sock == fd ? tls_write(tls_out.active.tls_ctx, block, len, more) : |
| 243 | #endif |
| 244 | #ifdef MSG_MORE |
| 245 | more && !(tctx->options & topt_not_socket) |
| 246 | ? send(fd, block, len, MSG_MORE) : |
| 247 | #endif |
| 248 | write(fd, block, len); |
| 249 | save_errno = errno; |
| 250 | } |
| 251 | |
| 252 | /* Timeout wanted. */ |
| 253 | |
| 254 | else |
| 255 | { |
| 256 | ALARM(local_timeout); |
| 257 | |
| 258 | rc = |
| 259 | #ifndef DISABLE_TLS |
| 260 | tls_out.active.sock == fd ? tls_write(tls_out.active.tls_ctx, block, len, more) : |
| 261 | #endif |
| 262 | #ifdef MSG_MORE |
| 263 | more && !(tctx->options & topt_not_socket) |
| 264 | ? send(fd, block, len, MSG_MORE) : |
| 265 | #endif |
| 266 | write(fd, block, len); |
| 267 | |
| 268 | save_errno = errno; |
| 269 | local_timeout = ALARM_CLR(0); |
| 270 | if (sigalrm_seen) |
| 271 | { |
| 272 | errno = ETIMEDOUT; |
| 273 | return FALSE; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | /* Hopefully, the most common case is success, so test that first. */ |
| 278 | |
| 279 | if (rc == len) { transport_count += len; return TRUE; } |
| 280 | |
| 281 | /* A non-negative return code is an incomplete write. Try again for the rest |
| 282 | of the block. If we have exactly hit the timeout, give up. */ |
| 283 | |
| 284 | if (rc >= 0) |
| 285 | { |
| 286 | len -= rc; |
| 287 | block += rc; |
| 288 | transport_count += rc; |
| 289 | DEBUG(D_transport) debug_printf("write incomplete (%d)\n", rc); |
| 290 | goto CHECK_TIMEOUT; /* A few lines below */ |
| 291 | } |
| 292 | |
| 293 | /* A negative return code with an EINTR error is another form of |
| 294 | incomplete write, zero bytes having been written */ |
| 295 | |
| 296 | if (save_errno == EINTR) |
| 297 | { |
| 298 | DEBUG(D_transport) |
| 299 | debug_printf("write interrupted before anything written\n"); |
| 300 | goto CHECK_TIMEOUT; /* A few lines below */ |
| 301 | } |
| 302 | |
| 303 | /* A response of EAGAIN from write() is likely only in the case of writing |
| 304 | to a FIFO that is not swallowing the data as fast as Exim is writing it. */ |
| 305 | |
| 306 | if (save_errno == EAGAIN) |
| 307 | { |
| 308 | DEBUG(D_transport) |
| 309 | debug_printf("write temporarily locked out, waiting 1 sec\n"); |
| 310 | sleep(1); |
| 311 | |
| 312 | /* Before continuing to try another write, check that we haven't run out of |
| 313 | time. */ |
| 314 | |
| 315 | CHECK_TIMEOUT: |
| 316 | if (transport_write_timeout > 0 && local_timeout <= 0) |
| 317 | { |
| 318 | errno = ETIMEDOUT; |
| 319 | return FALSE; |
| 320 | } |
| 321 | continue; |
| 322 | } |
| 323 | |
| 324 | /* Otherwise there's been an error */ |
| 325 | |
| 326 | DEBUG(D_transport) debug_printf("writing error %d: %s\n", save_errno, |
| 327 | strerror(save_errno)); |
| 328 | errno = save_errno; |
| 329 | return FALSE; |
| 330 | } |
| 331 | |
| 332 | /* We've tried and tried and tried but still failed */ |
| 333 | |
| 334 | errno = ERRNO_WRITEINCOMPLETE; |
| 335 | return FALSE; |
| 336 | } |
| 337 | |
| 338 | |
| 339 | BOOL |
| 340 | transport_write_block(transport_ctx * tctx, uschar *block, int len, BOOL more) |
| 341 | { |
| 342 | if (!(tctx->options & topt_output_string)) |
| 343 | return transport_write_block_fd(tctx, block, len, more); |
| 344 | |
| 345 | /* Write to expanding-string. NOTE: not NUL-terminated */ |
| 346 | |
| 347 | if (!tctx->u.msg) |
| 348 | tctx->u.msg = string_get(1024); |
| 349 | |
| 350 | tctx->u.msg = string_catn(tctx->u.msg, block, len); |
| 351 | return TRUE; |
| 352 | } |
| 353 | |
| 354 | |
| 355 | |
| 356 | |
| 357 | /************************************************* |
| 358 | * Write formatted string * |
| 359 | *************************************************/ |
| 360 | |
| 361 | /* This is called by various transports. It is a convenience function. |
| 362 | |
| 363 | Arguments: |
| 364 | fd file descriptor |
| 365 | format string format |
| 366 | ... arguments for format |
| 367 | |
| 368 | Returns: the yield of transport_write_block() |
| 369 | */ |
| 370 | |
| 371 | BOOL |
| 372 | transport_write_string(int fd, const char *format, ...) |
| 373 | { |
| 374 | transport_ctx tctx = {{0}}; |
| 375 | gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }; |
| 376 | va_list ap; |
| 377 | |
| 378 | /* Use taint-unchecked routines for writing into big_buffer, trusting |
| 379 | that the result will never be expanded. */ |
| 380 | |
| 381 | va_start(ap, format); |
| 382 | if (!string_vformat(&gs, SVFMT_TAINT_NOCHK, format, ap)) |
| 383 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "overlong formatted string in transport"); |
| 384 | va_end(ap); |
| 385 | tctx.u.fd = fd; |
| 386 | return transport_write_block(&tctx, gs.s, gs.ptr, FALSE); |
| 387 | } |
| 388 | |
| 389 | |
| 390 | |
| 391 | |
| 392 | void |
| 393 | transport_write_reset(int options) |
| 394 | { |
| 395 | if (!(options & topt_continuation)) chunk_ptr = deliver_out_buffer; |
| 396 | nl_partial_match = -1; |
| 397 | nl_check_length = nl_escape_length = 0; |
| 398 | } |
| 399 | |
| 400 | |
| 401 | |
| 402 | /************************************************* |
| 403 | * Write character chunk * |
| 404 | *************************************************/ |
| 405 | |
| 406 | /* Subroutine used by transport_write_message() to scan character chunks for |
| 407 | newlines and act appropriately. The object is to minimise the number of writes. |
| 408 | The output byte stream is buffered up in deliver_out_buffer, which is written |
| 409 | only when it gets full, thus minimizing write operations and TCP packets. |
| 410 | |
| 411 | Static data is used to handle the case when the last character of the previous |
| 412 | chunk was NL, or matched part of the data that has to be escaped. |
| 413 | |
| 414 | Arguments: |
| 415 | tctx transport context - processing to be done during output, |
| 416 | and file descriptor to write to |
| 417 | chunk pointer to data to write |
| 418 | len length of data to write |
| 419 | |
| 420 | In addition, the static nl_xxx variables must be set as required. |
| 421 | |
| 422 | Returns: TRUE on success, FALSE on failure (with errno preserved) |
| 423 | */ |
| 424 | |
| 425 | BOOL |
| 426 | write_chunk(transport_ctx * tctx, uschar *chunk, int len) |
| 427 | { |
| 428 | uschar *start = chunk; |
| 429 | uschar *end = chunk + len; |
| 430 | int mlen = DELIVER_OUT_BUFFER_SIZE - nl_escape_length - 2; |
| 431 | |
| 432 | /* The assumption is made that the check string will never stretch over move |
| 433 | than one chunk since the only time there are partial matches is when copying |
| 434 | the body in large buffers. There is always enough room in the buffer for an |
| 435 | escape string, since the loop below ensures this for each character it |
| 436 | processes, and it won't have stuck in the escape string if it left a partial |
| 437 | match. */ |
| 438 | |
| 439 | if (nl_partial_match >= 0) |
| 440 | { |
| 441 | if (nl_check_length > 0 && len >= nl_check_length && |
| 442 | Ustrncmp(start, nl_check + nl_partial_match, |
| 443 | nl_check_length - nl_partial_match) == 0) |
| 444 | { |
| 445 | Ustrncpy(chunk_ptr, nl_escape, nl_escape_length); |
| 446 | chunk_ptr += nl_escape_length; |
| 447 | start += nl_check_length - nl_partial_match; |
| 448 | } |
| 449 | |
| 450 | /* The partial match was a false one. Insert the characters carried over |
| 451 | from the previous chunk. */ |
| 452 | |
| 453 | else if (nl_partial_match > 0) |
| 454 | { |
| 455 | Ustrncpy(chunk_ptr, nl_check, nl_partial_match); |
| 456 | chunk_ptr += nl_partial_match; |
| 457 | } |
| 458 | |
| 459 | nl_partial_match = -1; |
| 460 | } |
| 461 | |
| 462 | /* Now process the characters in the chunk. Whenever we hit a newline we check |
| 463 | for possible escaping. The code for the non-NL route should be as fast as |
| 464 | possible. */ |
| 465 | |
| 466 | for (uschar * ptr = start; ptr < end; ptr++) |
| 467 | { |
| 468 | int ch, len; |
| 469 | |
| 470 | /* Flush the buffer if it has reached the threshold - we want to leave enough |
| 471 | room for the next uschar, plus a possible extra CR for an LF, plus the escape |
| 472 | string. */ |
| 473 | |
| 474 | if ((len = chunk_ptr - deliver_out_buffer) > mlen) |
| 475 | { |
| 476 | DEBUG(D_transport) debug_printf("flushing headers buffer\n"); |
| 477 | |
| 478 | /* If CHUNKING, prefix with BDAT (size) NON-LAST. Also, reap responses |
| 479 | from previous SMTP commands. */ |
| 480 | |
| 481 | if (tctx->options & topt_use_bdat && tctx->chunk_cb) |
| 482 | { |
| 483 | if ( tctx->chunk_cb(tctx, (unsigned)len, 0) != OK |
| 484 | || !transport_write_block(tctx, deliver_out_buffer, len, FALSE) |
| 485 | || tctx->chunk_cb(tctx, 0, tc_reap_prev) != OK |
| 486 | ) |
| 487 | return FALSE; |
| 488 | } |
| 489 | else |
| 490 | if (!transport_write_block(tctx, deliver_out_buffer, len, FALSE)) |
| 491 | return FALSE; |
| 492 | chunk_ptr = deliver_out_buffer; |
| 493 | } |
| 494 | |
| 495 | /* Remove CR before NL if required */ |
| 496 | |
| 497 | if ( *ptr == '\r' && ptr[1] == '\n' |
| 498 | && !(tctx->options & topt_use_crlf) |
| 499 | && f.spool_file_wireformat |
| 500 | ) |
| 501 | ptr++; |
| 502 | |
| 503 | if ((ch = *ptr) == '\n') |
| 504 | { |
| 505 | int left = end - ptr - 1; /* count of chars left after NL */ |
| 506 | |
| 507 | /* Insert CR before NL if required */ |
| 508 | |
| 509 | if (tctx->options & topt_use_crlf && !f.spool_file_wireformat) |
| 510 | *chunk_ptr++ = '\r'; |
| 511 | *chunk_ptr++ = '\n'; |
| 512 | transport_newlines++; |
| 513 | |
| 514 | /* The check_string test (formerly "from hack") replaces the specific |
| 515 | string at the start of a line with an escape string (e.g. "From " becomes |
| 516 | ">From " or "." becomes "..". It is a case-sensitive test. The length |
| 517 | check above ensures there is always enough room to insert this string. */ |
| 518 | |
| 519 | if (nl_check_length > 0) |
| 520 | { |
| 521 | if (left >= nl_check_length && |
| 522 | Ustrncmp(ptr+1, nl_check, nl_check_length) == 0) |
| 523 | { |
| 524 | Ustrncpy(chunk_ptr, nl_escape, nl_escape_length); |
| 525 | chunk_ptr += nl_escape_length; |
| 526 | ptr += nl_check_length; |
| 527 | } |
| 528 | |
| 529 | /* Handle the case when there isn't enough left to match the whole |
| 530 | check string, but there may be a partial match. We remember how many |
| 531 | characters matched, and finish processing this chunk. */ |
| 532 | |
| 533 | else if (left <= 0) nl_partial_match = 0; |
| 534 | |
| 535 | else if (Ustrncmp(ptr+1, nl_check, left) == 0) |
| 536 | { |
| 537 | nl_partial_match = left; |
| 538 | ptr = end; |
| 539 | } |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | /* Not a NL character */ |
| 544 | |
| 545 | else *chunk_ptr++ = ch; |
| 546 | } |
| 547 | |
| 548 | return TRUE; |
| 549 | } |
| 550 | |
| 551 | |
| 552 | |
| 553 | |
| 554 | /************************************************* |
| 555 | * Generate address for RCPT TO * |
| 556 | *************************************************/ |
| 557 | |
| 558 | /* This function puts together an address for RCPT to, using the caseful |
| 559 | version of the local part and the caseful version of the domain. If there is no |
| 560 | prefix or suffix, or if affixes are to be retained, we can just use the |
| 561 | original address. Otherwise, if there is a prefix but no suffix we can use a |
| 562 | pointer into the original address. If there is a suffix, however, we have to |
| 563 | build a new string. |
| 564 | |
| 565 | Arguments: |
| 566 | addr the address item |
| 567 | include_affixes TRUE if affixes are to be included |
| 568 | |
| 569 | Returns: a string |
| 570 | */ |
| 571 | |
| 572 | uschar * |
| 573 | transport_rcpt_address(address_item *addr, BOOL include_affixes) |
| 574 | { |
| 575 | uschar *at; |
| 576 | int plen, slen; |
| 577 | |
| 578 | if (include_affixes) |
| 579 | { |
| 580 | setflag(addr, af_include_affixes); /* Affects logged => line */ |
| 581 | return addr->address; |
| 582 | } |
| 583 | |
| 584 | if (addr->suffix == NULL) |
| 585 | { |
| 586 | if (addr->prefix == NULL) return addr->address; |
| 587 | return addr->address + Ustrlen(addr->prefix); |
| 588 | } |
| 589 | |
| 590 | at = Ustrrchr(addr->address, '@'); |
| 591 | plen = (addr->prefix == NULL)? 0 : Ustrlen(addr->prefix); |
| 592 | slen = Ustrlen(addr->suffix); |
| 593 | |
| 594 | return string_sprintf("%.*s@%s", (int)(at - addr->address - plen - slen), |
| 595 | addr->address + plen, at + 1); |
| 596 | } |
| 597 | |
| 598 | |
| 599 | /************************************************* |
| 600 | * Output Envelope-To: address & scan duplicates * |
| 601 | *************************************************/ |
| 602 | |
| 603 | /* This function is called from internal_transport_write_message() below, when |
| 604 | generating an Envelope-To: header line. It checks for duplicates of the given |
| 605 | address and its ancestors. When one is found, this function calls itself |
| 606 | recursively, to output the envelope address of the duplicate. |
| 607 | |
| 608 | We want to avoid duplication in the list, which can arise for example when |
| 609 | A->B,C and then both B and C alias to D. This can also happen when there are |
| 610 | unseen drivers in use. So a list of addresses that have been output is kept in |
| 611 | the plist variable. |
| 612 | |
| 613 | It is also possible to have loops in the address ancestry/duplication graph, |
| 614 | for example if there are two top level addresses A and B and we have A->B,C and |
| 615 | B->A. To break the loop, we use a list of processed addresses in the dlist |
| 616 | variable. |
| 617 | |
| 618 | After handling duplication, this function outputs the progenitor of the given |
| 619 | address. |
| 620 | |
| 621 | Arguments: |
| 622 | p the address we are interested in |
| 623 | pplist address of anchor of the list of addresses not to output |
| 624 | pdlist address of anchor of the list of processed addresses |
| 625 | first TRUE if this is the first address; set it FALSE afterwards |
| 626 | tctx transport context - processing to be done during output |
| 627 | and the file descriptor to write to |
| 628 | |
| 629 | Returns: FALSE if writing failed |
| 630 | */ |
| 631 | |
| 632 | static BOOL |
| 633 | write_env_to(address_item *p, struct aci **pplist, struct aci **pdlist, |
| 634 | BOOL *first, transport_ctx * tctx) |
| 635 | { |
| 636 | address_item *pp; |
| 637 | struct aci *ppp; |
| 638 | |
| 639 | /* Do nothing if we have already handled this address. If not, remember it |
| 640 | so that we don't handle it again. */ |
| 641 | |
| 642 | for (ppp = *pdlist; ppp; ppp = ppp->next) if (p == ppp->ptr) return TRUE; |
| 643 | |
| 644 | ppp = store_get(sizeof(struct aci), FALSE); |
| 645 | ppp->next = *pdlist; |
| 646 | *pdlist = ppp; |
| 647 | ppp->ptr = p; |
| 648 | |
| 649 | /* Now scan up the ancestry, checking for duplicates at each generation. */ |
| 650 | |
| 651 | for (pp = p;; pp = pp->parent) |
| 652 | { |
| 653 | address_item *dup; |
| 654 | for (dup = addr_duplicate; dup; dup = dup->next) |
| 655 | if (dup->dupof == pp) /* a dup of our address */ |
| 656 | if (!write_env_to(dup, pplist, pdlist, first, tctx)) |
| 657 | return FALSE; |
| 658 | if (!pp->parent) break; |
| 659 | } |
| 660 | |
| 661 | /* Check to see if we have already output the progenitor. */ |
| 662 | |
| 663 | for (ppp = *pplist; ppp; ppp = ppp->next) if (pp == ppp->ptr) break; |
| 664 | if (ppp) return TRUE; |
| 665 | |
| 666 | /* Remember what we have output, and output it. */ |
| 667 | |
| 668 | ppp = store_get(sizeof(struct aci), FALSE); |
| 669 | ppp->next = *pplist; |
| 670 | *pplist = ppp; |
| 671 | ppp->ptr = pp; |
| 672 | |
| 673 | if (!*first && !write_chunk(tctx, US",\n ", 3)) return FALSE; |
| 674 | *first = FALSE; |
| 675 | return write_chunk(tctx, pp->address, Ustrlen(pp->address)); |
| 676 | } |
| 677 | |
| 678 | |
| 679 | |
| 680 | |
| 681 | /* Add/remove/rewrite headers, and send them plus the empty-line separator. |
| 682 | |
| 683 | Globals: |
| 684 | header_list |
| 685 | |
| 686 | Arguments: |
| 687 | addr (chain of) addresses (for extra headers), or NULL; |
| 688 | only the first address is used |
| 689 | tctx transport context |
| 690 | sendfn function for output (transport or verify) |
| 691 | |
| 692 | Returns: TRUE on success; FALSE on failure. |
| 693 | */ |
| 694 | BOOL |
| 695 | transport_headers_send(transport_ctx * tctx, |
| 696 | BOOL (*sendfn)(transport_ctx * tctx, uschar * s, int len)) |
| 697 | { |
| 698 | const uschar *list; |
| 699 | transport_instance * tblock = tctx ? tctx->tblock : NULL; |
| 700 | address_item * addr = tctx ? tctx->addr : NULL; |
| 701 | |
| 702 | /* Then the message's headers. Don't write any that are flagged as "old"; |
| 703 | that means they were rewritten, or are a record of envelope rewriting, or |
| 704 | were removed (e.g. Bcc). If remove_headers is not null, skip any headers that |
| 705 | match any entries therein. It is a colon-sep list; expand the items |
| 706 | separately and squash any empty ones. |
| 707 | Then check addr->prop.remove_headers too, provided that addr is not NULL. */ |
| 708 | |
| 709 | for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old) |
| 710 | { |
| 711 | BOOL include_header = TRUE; |
| 712 | |
| 713 | list = tblock ? tblock->remove_headers : NULL; |
| 714 | for (int i = 0; i < 2; i++) /* For remove_headers && addr->prop.remove_headers */ |
| 715 | { |
| 716 | if (list) |
| 717 | { |
| 718 | int sep = ':'; /* This is specified as a colon-separated list */ |
| 719 | uschar *s, *ss; |
| 720 | while ((s = string_nextinlist(&list, &sep, NULL, 0))) |
| 721 | { |
| 722 | int len; |
| 723 | |
| 724 | if (i == 0) |
| 725 | if (!(s = expand_string(s)) && !f.expand_string_forcedfail) |
| 726 | { |
| 727 | errno = ERRNO_CHHEADER_FAIL; |
| 728 | return FALSE; |
| 729 | } |
| 730 | len = s ? Ustrlen(s) : 0; |
| 731 | if (strncmpic(h->text, s, len) != 0) continue; |
| 732 | ss = h->text + len; |
| 733 | while (*ss == ' ' || *ss == '\t') ss++; |
| 734 | if (*ss == ':') break; |
| 735 | } |
| 736 | if (s) { include_header = FALSE; break; } |
| 737 | } |
| 738 | if (addr) list = addr->prop.remove_headers; |
| 739 | } |
| 740 | |
| 741 | /* If this header is to be output, try to rewrite it if there are rewriting |
| 742 | rules. */ |
| 743 | |
| 744 | if (include_header) |
| 745 | { |
| 746 | if (tblock && tblock->rewrite_rules) |
| 747 | { |
| 748 | rmark reset_point = store_mark(); |
| 749 | header_line *hh; |
| 750 | |
| 751 | if ((hh = rewrite_header(h, NULL, NULL, tblock->rewrite_rules, |
| 752 | tblock->rewrite_existflags, FALSE))) |
| 753 | { |
| 754 | if (!sendfn(tctx, hh->text, hh->slen)) return FALSE; |
| 755 | store_reset(reset_point); |
| 756 | continue; /* With the next header line */ |
| 757 | } |
| 758 | } |
| 759 | |
| 760 | /* Either no rewriting rules, or it didn't get rewritten */ |
| 761 | |
| 762 | if (!sendfn(tctx, h->text, h->slen)) return FALSE; |
| 763 | } |
| 764 | |
| 765 | /* Header removed */ |
| 766 | |
| 767 | else |
| 768 | DEBUG(D_transport) debug_printf("removed header line:\n%s---\n", h->text); |
| 769 | } |
| 770 | |
| 771 | /* Add on any address-specific headers. If there are multiple addresses, |
| 772 | they will all have the same headers in order to be batched. The headers |
| 773 | are chained in reverse order of adding (so several addresses from the |
| 774 | same alias might share some of them) but we want to output them in the |
| 775 | opposite order. This is a bit tedious, but there shouldn't be very many |
| 776 | of them. We just walk the list twice, reversing the pointers each time, |
| 777 | but on the second time, write out the items. |
| 778 | |
| 779 | Headers added to an address by a router are guaranteed to end with a newline. |
| 780 | */ |
| 781 | |
| 782 | if (addr) |
| 783 | { |
| 784 | header_line *hprev = addr->prop.extra_headers; |
| 785 | header_line *hnext, * h; |
| 786 | for (int i = 0; i < 2; i++) |
| 787 | for (h = hprev, hprev = NULL; h; h = hnext) |
| 788 | { |
| 789 | hnext = h->next; |
| 790 | h->next = hprev; |
| 791 | hprev = h; |
| 792 | if (i == 1) |
| 793 | { |
| 794 | if (!sendfn(tctx, h->text, h->slen)) return FALSE; |
| 795 | DEBUG(D_transport) |
| 796 | debug_printf("added header line(s):\n%s---\n", h->text); |
| 797 | } |
| 798 | } |
| 799 | } |
| 800 | |
| 801 | /* If a string containing additional headers exists it is a newline-sep |
| 802 | list. Expand each item and write out the result. This is done last so that |
| 803 | if it (deliberately or accidentally) isn't in header format, it won't mess |
| 804 | up any other headers. An empty string or a forced expansion failure are |
| 805 | noops. An added header string from a transport may not end with a newline; |
| 806 | add one if it does not. */ |
| 807 | |
| 808 | if (tblock && (list = CUS tblock->add_headers)) |
| 809 | { |
| 810 | int sep = '\n'; |
| 811 | uschar * s; |
| 812 | |
| 813 | while ((s = string_nextinlist(&list, &sep, NULL, 0))) |
| 814 | if ((s = expand_string(s))) |
| 815 | { |
| 816 | int len = Ustrlen(s); |
| 817 | if (len > 0) |
| 818 | { |
| 819 | if (!sendfn(tctx, s, len)) return FALSE; |
| 820 | if (s[len-1] != '\n' && !sendfn(tctx, US"\n", 1)) |
| 821 | return FALSE; |
| 822 | DEBUG(D_transport) |
| 823 | { |
| 824 | debug_printf("added header line:\n%s", s); |
| 825 | if (s[len-1] != '\n') debug_printf("\n"); |
| 826 | debug_printf("---\n"); |
| 827 | } |
| 828 | } |
| 829 | } |
| 830 | else if (!f.expand_string_forcedfail) |
| 831 | { errno = ERRNO_CHHEADER_FAIL; return FALSE; } |
| 832 | } |
| 833 | |
| 834 | /* Separate headers from body with a blank line */ |
| 835 | |
| 836 | return sendfn(tctx, US"\n", 1); |
| 837 | } |
| 838 | |
| 839 | |
| 840 | /************************************************* |
| 841 | * Write the message * |
| 842 | *************************************************/ |
| 843 | |
| 844 | /* This function writes the message to the given file descriptor. The headers |
| 845 | are in the in-store data structure, and the rest of the message is in the open |
| 846 | file descriptor deliver_datafile. Make sure we start it at the beginning. |
| 847 | |
| 848 | . If add_return_path is TRUE, a "return-path:" header is added to the message, |
| 849 | containing the envelope sender's address. |
| 850 | |
| 851 | . If add_envelope_to is TRUE, a "envelope-to:" header is added to the message, |
| 852 | giving the top-level envelope address that caused this delivery to happen. |
| 853 | |
| 854 | . If add_delivery_date is TRUE, a "delivery-date:" header is added to the |
| 855 | message. It gives the time and date that delivery took place. |
| 856 | |
| 857 | . If check_string is not null, the start of each line is checked for that |
| 858 | string. If it is found, it is replaced by escape_string. This used to be |
| 859 | the "from hack" for files, and "smtp_dots" for escaping SMTP dots. |
| 860 | |
| 861 | . If use_crlf is true, newlines are turned into CRLF (SMTP output). |
| 862 | |
| 863 | The yield is TRUE if all went well, and FALSE if not. Exit *immediately* after |
| 864 | any writing or reading error, leaving the code in errno intact. Error exits |
| 865 | can include timeouts for certain transports, which are requested by setting |
| 866 | transport_write_timeout non-zero. |
| 867 | |
| 868 | Arguments: |
| 869 | tctx |
| 870 | (fd, msg) Either and fd, to write the message to, |
| 871 | or a string: if null write message to allocated space |
| 872 | otherwire take content as headers. |
| 873 | addr (chain of) addresses (for extra headers), or NULL; |
| 874 | only the first address is used |
| 875 | tblock optional transport instance block (NULL signifies NULL/0): |
| 876 | add_headers a string containing one or more headers to add; it is |
| 877 | expanded, and must be in correct RFC 822 format as |
| 878 | it is transmitted verbatim; NULL => no additions, |
| 879 | and so does empty string or forced expansion fail |
| 880 | remove_headers a colon-separated list of headers to remove, or NULL |
| 881 | rewrite_rules chain of header rewriting rules |
| 882 | rewrite_existflags flags for the rewriting rules |
| 883 | options bit-wise options: |
| 884 | add_return_path if TRUE, add a "return-path" header |
| 885 | add_envelope_to if TRUE, add a "envelope-to" header |
| 886 | add_delivery_date if TRUE, add a "delivery-date" header |
| 887 | use_crlf if TRUE, turn NL into CR LF |
| 888 | end_dot if TRUE, send a terminating "." line at the end |
| 889 | no_headers if TRUE, omit the headers |
| 890 | no_body if TRUE, omit the body |
| 891 | check_string a string to check for at the start of lines, or NULL |
| 892 | escape_string a string to insert in front of any check string |
| 893 | size_limit if > 0, this is a limit to the size of message written; |
| 894 | it is used when returning messages to their senders, |
| 895 | and is approximate rather than exact, owing to chunk |
| 896 | buffering |
| 897 | |
| 898 | Returns: TRUE on success; FALSE (with errno) on failure. |
| 899 | In addition, the global variable transport_count |
| 900 | is incremented by the number of bytes written. |
| 901 | */ |
| 902 | |
| 903 | static BOOL |
| 904 | internal_transport_write_message(transport_ctx * tctx, int size_limit) |
| 905 | { |
| 906 | int len, size = 0; |
| 907 | |
| 908 | /* Initialize pointer in output buffer. */ |
| 909 | |
| 910 | transport_write_reset(tctx->options); |
| 911 | |
| 912 | /* Set up the data for start-of-line data checking and escaping */ |
| 913 | |
| 914 | if (tctx->check_string && tctx->escape_string) |
| 915 | { |
| 916 | nl_check = tctx->check_string; |
| 917 | nl_check_length = Ustrlen(nl_check); |
| 918 | nl_escape = tctx->escape_string; |
| 919 | nl_escape_length = Ustrlen(nl_escape); |
| 920 | } |
| 921 | |
| 922 | /* Whether the escaping mechanism is applied to headers or not is controlled by |
| 923 | an option (set for SMTP, not otherwise). Negate the length if not wanted till |
| 924 | after the headers. */ |
| 925 | |
| 926 | if (!(tctx->options & topt_escape_headers)) |
| 927 | nl_check_length = -nl_check_length; |
| 928 | |
| 929 | /* Write the headers if required, including any that have to be added. If there |
| 930 | are header rewriting rules, apply them. The datasource is not the -D spoolfile |
| 931 | so temporarily hide the global that adjusts for its format. */ |
| 932 | |
| 933 | if (!(tctx->options & topt_no_headers)) |
| 934 | { |
| 935 | BOOL save_wireformat = f.spool_file_wireformat; |
| 936 | f.spool_file_wireformat = FALSE; |
| 937 | |
| 938 | /* Add return-path: if requested. */ |
| 939 | |
| 940 | if (tctx->options & topt_add_return_path) |
| 941 | { |
| 942 | uschar buffer[ADDRESS_MAXLENGTH + 20]; |
| 943 | int n = sprintf(CS buffer, "Return-path: <%.*s>\n", ADDRESS_MAXLENGTH, |
| 944 | return_path); |
| 945 | if (!write_chunk(tctx, buffer, n)) goto bad; |
| 946 | } |
| 947 | |
| 948 | /* Add envelope-to: if requested */ |
| 949 | |
| 950 | if (tctx->options & topt_add_envelope_to) |
| 951 | { |
| 952 | BOOL first = TRUE; |
| 953 | struct aci *plist = NULL; |
| 954 | struct aci *dlist = NULL; |
| 955 | rmark reset_point = store_mark(); |
| 956 | |
| 957 | if (!write_chunk(tctx, US"Envelope-to: ", 13)) goto bad; |
| 958 | |
| 959 | /* Pick up from all the addresses. The plist and dlist variables are |
| 960 | anchors for lists of addresses already handled; they have to be defined at |
| 961 | this level because write_env_to() calls itself recursively. */ |
| 962 | |
| 963 | for (address_item * p = tctx->addr; p; p = p->next) |
| 964 | if (!write_env_to(p, &plist, &dlist, &first, tctx)) |
| 965 | goto bad; |
| 966 | |
| 967 | /* Add a final newline and reset the store used for tracking duplicates */ |
| 968 | |
| 969 | if (!write_chunk(tctx, US"\n", 1)) goto bad; |
| 970 | store_reset(reset_point); |
| 971 | } |
| 972 | |
| 973 | /* Add delivery-date: if requested. */ |
| 974 | |
| 975 | if (tctx->options & topt_add_delivery_date) |
| 976 | { |
| 977 | uschar * s = tod_stamp(tod_full); |
| 978 | |
| 979 | if ( !write_chunk(tctx, US"Delivery-date: ", 15) |
| 980 | || !write_chunk(tctx, s, Ustrlen(s)) |
| 981 | || !write_chunk(tctx, US"\n", 1)) goto bad; |
| 982 | } |
| 983 | |
| 984 | /* Then the message's headers. Don't write any that are flagged as "old"; |
| 985 | that means they were rewritten, or are a record of envelope rewriting, or |
| 986 | were removed (e.g. Bcc). If remove_headers is not null, skip any headers that |
| 987 | match any entries therein. Then check addr->prop.remove_headers too, provided that |
| 988 | addr is not NULL. */ |
| 989 | |
| 990 | if (!transport_headers_send(tctx, &write_chunk)) |
| 991 | { |
| 992 | bad: |
| 993 | f.spool_file_wireformat = save_wireformat; |
| 994 | return FALSE; |
| 995 | } |
| 996 | |
| 997 | f.spool_file_wireformat = save_wireformat; |
| 998 | } |
| 999 | |
| 1000 | /* When doing RFC3030 CHUNKING output, work out how much data would be in a |
| 1001 | last-BDAT, consisting of the current write_chunk() output buffer fill |
| 1002 | (optimally, all of the headers - but it does not matter if we already had to |
| 1003 | flush that buffer with non-last BDAT prependix) plus the amount of body data |
| 1004 | (as expanded for CRLF lines). Then create and write BDAT(s), and ensure |
| 1005 | that further use of write_chunk() will not prepend BDATs. |
| 1006 | The first BDAT written will also first flush any outstanding MAIL and RCPT |
| 1007 | commands which were buffered thans to PIPELINING. |
| 1008 | Commands go out (using a send()) from a different buffer to data (using a |
| 1009 | write()). They might not end up in the same TCP segment, which is |
| 1010 | suboptimal. */ |
| 1011 | |
| 1012 | if (tctx->options & topt_use_bdat) |
| 1013 | { |
| 1014 | off_t fsize; |
| 1015 | int hsize; |
| 1016 | |
| 1017 | if ((hsize = chunk_ptr - deliver_out_buffer) < 0) |
| 1018 | hsize = 0; |
| 1019 | if (!(tctx->options & topt_no_body)) |
| 1020 | { |
| 1021 | if ((fsize = lseek(deliver_datafile, 0, SEEK_END)) < 0) return FALSE; |
| 1022 | fsize -= SPOOL_DATA_START_OFFSET; |
| 1023 | if (size_limit > 0 && fsize > size_limit) |
| 1024 | fsize = size_limit; |
| 1025 | size = hsize + fsize; |
| 1026 | if (tctx->options & topt_use_crlf && !f.spool_file_wireformat) |
| 1027 | size += body_linecount; /* account for CRLF-expansion */ |
| 1028 | |
| 1029 | /* With topt_use_bdat we never do dot-stuffing; no need to |
| 1030 | account for any expansion due to that. */ |
| 1031 | } |
| 1032 | |
| 1033 | /* If the message is large, emit first a non-LAST chunk with just the |
| 1034 | headers, and reap the command responses. This lets us error out early |
| 1035 | on RCPT rejects rather than sending megabytes of data. Include headers |
| 1036 | on the assumption they are cheap enough and some clever implementations |
| 1037 | might errorcheck them too, on-the-fly, and reject that chunk. */ |
| 1038 | |
| 1039 | if (size > DELIVER_OUT_BUFFER_SIZE && hsize > 0) |
| 1040 | { |
| 1041 | DEBUG(D_transport) |
| 1042 | debug_printf("sending small initial BDAT; hsize=%d\n", hsize); |
| 1043 | if ( tctx->chunk_cb(tctx, hsize, 0) != OK |
| 1044 | || !transport_write_block(tctx, deliver_out_buffer, hsize, FALSE) |
| 1045 | || tctx->chunk_cb(tctx, 0, tc_reap_prev) != OK |
| 1046 | ) |
| 1047 | return FALSE; |
| 1048 | chunk_ptr = deliver_out_buffer; |
| 1049 | size -= hsize; |
| 1050 | } |
| 1051 | |
| 1052 | /* Emit a LAST datachunk command, and unmark the context for further |
| 1053 | BDAT commands. */ |
| 1054 | |
| 1055 | if (tctx->chunk_cb(tctx, size, tc_chunk_last) != OK) |
| 1056 | return FALSE; |
| 1057 | tctx->options &= ~topt_use_bdat; |
| 1058 | } |
| 1059 | |
| 1060 | /* If the body is required, ensure that the data for check strings (formerly |
| 1061 | the "from hack") is enabled by negating the length if necessary. (It will be |
| 1062 | negative in cases where it isn't to apply to the headers). Then ensure the body |
| 1063 | is positioned at the start of its file (following the message id), then write |
| 1064 | it, applying the size limit if required. */ |
| 1065 | |
| 1066 | /* If we have a wireformat -D file (CRNL lines, non-dotstuffed, no ending dot) |
| 1067 | and we want to send a body without dotstuffing or ending-dot, in-clear, |
| 1068 | then we can just dump it using sendfile. |
| 1069 | This should get used for CHUNKING output and also for writing the -K file for |
| 1070 | dkim signing, when we had CHUNKING input. */ |
| 1071 | |
| 1072 | #ifdef OS_SENDFILE |
| 1073 | if ( f.spool_file_wireformat |
| 1074 | && !(tctx->options & (topt_no_body | topt_end_dot)) |
| 1075 | && !nl_check_length |
| 1076 | && tls_out.active.sock != tctx->u.fd |
| 1077 | ) |
| 1078 | { |
| 1079 | ssize_t copied = 0; |
| 1080 | off_t offset = SPOOL_DATA_START_OFFSET; |
| 1081 | |
| 1082 | /* Write out any header data in the buffer */ |
| 1083 | |
| 1084 | if ((len = chunk_ptr - deliver_out_buffer) > 0) |
| 1085 | { |
| 1086 | if (!transport_write_block(tctx, deliver_out_buffer, len, TRUE)) |
| 1087 | return FALSE; |
| 1088 | size -= len; |
| 1089 | } |
| 1090 | |
| 1091 | DEBUG(D_transport) debug_printf("using sendfile for body\n"); |
| 1092 | |
| 1093 | while(size > 0) |
| 1094 | { |
| 1095 | if ((copied = os_sendfile(tctx->u.fd, deliver_datafile, &offset, size)) <= 0) break; |
| 1096 | size -= copied; |
| 1097 | } |
| 1098 | return copied >= 0; |
| 1099 | } |
| 1100 | #else |
| 1101 | DEBUG(D_transport) debug_printf("cannot use sendfile for body: no support\n"); |
| 1102 | #endif |
| 1103 | |
| 1104 | DEBUG(D_transport) |
| 1105 | if (!(tctx->options & topt_no_body)) |
| 1106 | debug_printf("cannot use sendfile for body: %s\n", |
| 1107 | !f.spool_file_wireformat ? "spoolfile not wireformat" |
| 1108 | : tctx->options & topt_end_dot ? "terminating dot wanted" |
| 1109 | : nl_check_length ? "dot- or From-stuffing wanted" |
| 1110 | : "TLS output wanted"); |
| 1111 | |
| 1112 | if (!(tctx->options & topt_no_body)) |
| 1113 | { |
| 1114 | unsigned long size = size_limit > 0 ? size_limit : ULONG_MAX; |
| 1115 | |
| 1116 | nl_check_length = abs(nl_check_length); |
| 1117 | nl_partial_match = 0; |
| 1118 | if (lseek(deliver_datafile, SPOOL_DATA_START_OFFSET, SEEK_SET) < 0) |
| 1119 | return FALSE; |
| 1120 | while ( (len = MIN(DELIVER_IN_BUFFER_SIZE, size)) > 0 |
| 1121 | && (len = read(deliver_datafile, deliver_in_buffer, len)) > 0) |
| 1122 | { |
| 1123 | if (!write_chunk(tctx, deliver_in_buffer, len)) |
| 1124 | return FALSE; |
| 1125 | size -= len; |
| 1126 | } |
| 1127 | |
| 1128 | /* A read error on the body will have left len == -1 and errno set. */ |
| 1129 | |
| 1130 | if (len != 0) return FALSE; |
| 1131 | } |
| 1132 | |
| 1133 | /* Finished with the check string, and spool-format consideration */ |
| 1134 | |
| 1135 | nl_check_length = nl_escape_length = 0; |
| 1136 | f.spool_file_wireformat = FALSE; |
| 1137 | |
| 1138 | /* If requested, add a terminating "." line (SMTP output). */ |
| 1139 | |
| 1140 | if (tctx->options & topt_end_dot && !write_chunk(tctx, US".\n", 2)) |
| 1141 | return FALSE; |
| 1142 | |
| 1143 | /* Write out any remaining data in the buffer before returning. */ |
| 1144 | |
| 1145 | return (len = chunk_ptr - deliver_out_buffer) <= 0 || |
| 1146 | transport_write_block(tctx, deliver_out_buffer, len, FALSE); |
| 1147 | } |
| 1148 | |
| 1149 | |
| 1150 | |
| 1151 | |
| 1152 | /************************************************* |
| 1153 | * External interface to write the message * |
| 1154 | *************************************************/ |
| 1155 | |
| 1156 | /* If there is no filtering required, call the internal function above to do |
| 1157 | the real work, passing over all the arguments from this function. Otherwise, |
| 1158 | set up a filtering process, fork another process to call the internal function |
| 1159 | to write to the filter, and in this process just suck from the filter and write |
| 1160 | down the fd in the transport context. At the end, tidy up the pipes and the |
| 1161 | processes. |
| 1162 | |
| 1163 | Arguments: as for internal_transport_write_message() above |
| 1164 | |
| 1165 | Returns: TRUE on success; FALSE (with errno) for any failure |
| 1166 | transport_count is incremented by the number of bytes written |
| 1167 | */ |
| 1168 | |
| 1169 | BOOL |
| 1170 | transport_write_message(transport_ctx * tctx, int size_limit) |
| 1171 | { |
| 1172 | BOOL last_filter_was_NL = TRUE; |
| 1173 | BOOL save_spool_file_wireformat = f.spool_file_wireformat; |
| 1174 | int rc, len, yield, fd_read, fd_write, save_errno; |
| 1175 | int pfd[2] = {-1, -1}; |
| 1176 | pid_t filter_pid, write_pid; |
| 1177 | |
| 1178 | f.transport_filter_timed_out = FALSE; |
| 1179 | |
| 1180 | /* If there is no filter command set up, call the internal function that does |
| 1181 | the actual work, passing it the incoming fd, and return its result. */ |
| 1182 | |
| 1183 | if ( !transport_filter_argv |
| 1184 | || !*transport_filter_argv |
| 1185 | || !**transport_filter_argv |
| 1186 | ) |
| 1187 | return internal_transport_write_message(tctx, size_limit); |
| 1188 | |
| 1189 | /* Otherwise the message must be written to a filter process and read back |
| 1190 | before being written to the incoming fd. First set up the special processing to |
| 1191 | be done during the copying. */ |
| 1192 | |
| 1193 | nl_partial_match = -1; |
| 1194 | |
| 1195 | if (tctx->check_string && tctx->escape_string) |
| 1196 | { |
| 1197 | nl_check = tctx->check_string; |
| 1198 | nl_check_length = Ustrlen(nl_check); |
| 1199 | nl_escape = tctx->escape_string; |
| 1200 | nl_escape_length = Ustrlen(nl_escape); |
| 1201 | } |
| 1202 | else nl_check_length = nl_escape_length = 0; |
| 1203 | |
| 1204 | /* Start up a subprocess to run the command. Ensure that our main fd will |
| 1205 | be closed when the subprocess execs, but remove the flag afterwards. |
| 1206 | (Otherwise, if this is a TCP/IP socket, it can't get passed on to another |
| 1207 | process to deliver another message.) We get back stdin/stdout file descriptors. |
| 1208 | If the process creation failed, give an error return. */ |
| 1209 | |
| 1210 | fd_read = -1; |
| 1211 | fd_write = -1; |
| 1212 | save_errno = 0; |
| 1213 | yield = FALSE; |
| 1214 | write_pid = (pid_t)(-1); |
| 1215 | |
| 1216 | { |
| 1217 | int bits = fcntl(tctx->u.fd, F_GETFD); |
| 1218 | (void)fcntl(tctx->u.fd, F_SETFD, bits | FD_CLOEXEC); |
| 1219 | filter_pid = child_open(USS transport_filter_argv, NULL, 077, |
| 1220 | &fd_write, &fd_read, FALSE); |
| 1221 | (void)fcntl(tctx->u.fd, F_SETFD, bits & ~FD_CLOEXEC); |
| 1222 | } |
| 1223 | if (filter_pid < 0) goto TIDY_UP; /* errno set */ |
| 1224 | |
| 1225 | DEBUG(D_transport) |
| 1226 | debug_printf("process %d running as transport filter: fd_write=%d fd_read=%d\n", |
| 1227 | (int)filter_pid, fd_write, fd_read); |
| 1228 | |
| 1229 | /* Fork subprocess to write the message to the filter, and return the result |
| 1230 | via a(nother) pipe. While writing to the filter, we do not do the CRLF, |
| 1231 | smtp dots, or check string processing. */ |
| 1232 | |
| 1233 | if (pipe(pfd) != 0) goto TIDY_UP; /* errno set */ |
| 1234 | if ((write_pid = fork()) == 0) |
| 1235 | { |
| 1236 | BOOL rc; |
| 1237 | (void)close(fd_read); |
| 1238 | (void)close(pfd[pipe_read]); |
| 1239 | nl_check_length = nl_escape_length = 0; |
| 1240 | |
| 1241 | tctx->u.fd = fd_write; |
| 1242 | tctx->check_string = tctx->escape_string = NULL; |
| 1243 | tctx->options &= ~(topt_use_crlf | topt_end_dot | topt_use_bdat); |
| 1244 | |
| 1245 | rc = internal_transport_write_message(tctx, size_limit); |
| 1246 | |
| 1247 | save_errno = errno; |
| 1248 | if ( write(pfd[pipe_write], (void *)&rc, sizeof(BOOL)) |
| 1249 | != sizeof(BOOL) |
| 1250 | || write(pfd[pipe_write], (void *)&save_errno, sizeof(int)) |
| 1251 | != sizeof(int) |
| 1252 | || write(pfd[pipe_write], (void *)&tctx->addr->more_errno, sizeof(int)) |
| 1253 | != sizeof(int) |
| 1254 | || write(pfd[pipe_write], (void *)&tctx->addr->delivery_usec, sizeof(int)) |
| 1255 | != sizeof(int) |
| 1256 | ) |
| 1257 | rc = FALSE; /* compiler quietening */ |
| 1258 | exim_underbar_exit(0); |
| 1259 | } |
| 1260 | save_errno = errno; |
| 1261 | |
| 1262 | /* Parent process: close our copy of the writing subprocess' pipes. */ |
| 1263 | |
| 1264 | (void)close(pfd[pipe_write]); |
| 1265 | (void)close(fd_write); |
| 1266 | fd_write = -1; |
| 1267 | |
| 1268 | /* Writing process creation failed */ |
| 1269 | |
| 1270 | if (write_pid < 0) |
| 1271 | { |
| 1272 | errno = save_errno; /* restore */ |
| 1273 | goto TIDY_UP; |
| 1274 | } |
| 1275 | |
| 1276 | /* When testing, let the subprocess get going */ |
| 1277 | |
| 1278 | testharness_pause_ms(250); |
| 1279 | |
| 1280 | DEBUG(D_transport) |
| 1281 | debug_printf("process %d writing to transport filter\n", (int)write_pid); |
| 1282 | |
| 1283 | /* Copy the message from the filter to the output fd. A read error leaves len |
| 1284 | == -1 and errno set. We need to apply a timeout to the read, to cope with |
| 1285 | the case when the filter gets stuck, but it can be quite a long one. The |
| 1286 | default is 5m, but this is now configurable. */ |
| 1287 | |
| 1288 | DEBUG(D_transport) debug_printf("copying from the filter\n"); |
| 1289 | |
| 1290 | /* Copy the output of the filter, remembering if the last character was NL. If |
| 1291 | no data is returned, that counts as "ended with NL" (default setting of the |
| 1292 | variable is TRUE). The output should always be unix-format as we converted |
| 1293 | any wireformat source on writing input to the filter. */ |
| 1294 | |
| 1295 | f.spool_file_wireformat = FALSE; |
| 1296 | chunk_ptr = deliver_out_buffer; |
| 1297 | |
| 1298 | for (;;) |
| 1299 | { |
| 1300 | sigalrm_seen = FALSE; |
| 1301 | ALARM(transport_filter_timeout); |
| 1302 | len = read(fd_read, deliver_in_buffer, DELIVER_IN_BUFFER_SIZE); |
| 1303 | ALARM_CLR(0); |
| 1304 | if (sigalrm_seen) |
| 1305 | { |
| 1306 | errno = ETIMEDOUT; |
| 1307 | f.transport_filter_timed_out = TRUE; |
| 1308 | goto TIDY_UP; |
| 1309 | } |
| 1310 | |
| 1311 | /* If the read was successful, write the block down the original fd, |
| 1312 | remembering whether it ends in \n or not. */ |
| 1313 | |
| 1314 | if (len > 0) |
| 1315 | { |
| 1316 | if (!write_chunk(tctx, deliver_in_buffer, len)) goto TIDY_UP; |
| 1317 | last_filter_was_NL = (deliver_in_buffer[len-1] == '\n'); |
| 1318 | } |
| 1319 | |
| 1320 | /* Otherwise, break the loop. If we have hit EOF, set yield = TRUE. */ |
| 1321 | |
| 1322 | else |
| 1323 | { |
| 1324 | if (len == 0) yield = TRUE; |
| 1325 | break; |
| 1326 | } |
| 1327 | } |
| 1328 | |
| 1329 | /* Tidying up code. If yield = FALSE there has been an error and errno is set |
| 1330 | to something. Ensure the pipes are all closed and the processes are removed. If |
| 1331 | there has been an error, kill the processes before waiting for them, just to be |
| 1332 | sure. Also apply a paranoia timeout. */ |
| 1333 | |
| 1334 | TIDY_UP: |
| 1335 | f.spool_file_wireformat = save_spool_file_wireformat; |
| 1336 | save_errno = errno; |
| 1337 | |
| 1338 | (void)close(fd_read); |
| 1339 | if (fd_write > 0) (void)close(fd_write); |
| 1340 | |
| 1341 | if (!yield) |
| 1342 | { |
| 1343 | if (filter_pid > 0) kill(filter_pid, SIGKILL); |
| 1344 | if (write_pid > 0) kill(write_pid, SIGKILL); |
| 1345 | } |
| 1346 | |
| 1347 | /* Wait for the filter process to complete. */ |
| 1348 | |
| 1349 | DEBUG(D_transport) debug_printf("waiting for filter process\n"); |
| 1350 | if (filter_pid > 0 && (rc = child_close(filter_pid, 30)) != 0 && yield) |
| 1351 | { |
| 1352 | yield = FALSE; |
| 1353 | save_errno = ERRNO_FILTER_FAIL; |
| 1354 | tctx->addr->more_errno = rc; |
| 1355 | DEBUG(D_transport) debug_printf("filter process returned %d\n", rc); |
| 1356 | } |
| 1357 | |
| 1358 | /* Wait for the writing process to complete. If it ends successfully, |
| 1359 | read the results from its pipe, provided we haven't already had a filter |
| 1360 | process failure. */ |
| 1361 | |
| 1362 | DEBUG(D_transport) debug_printf("waiting for writing process\n"); |
| 1363 | if (write_pid > 0) |
| 1364 | { |
| 1365 | rc = child_close(write_pid, 30); |
| 1366 | if (yield) |
| 1367 | if (rc == 0) |
| 1368 | { |
| 1369 | BOOL ok; |
| 1370 | if (read(pfd[pipe_read], (void *)&ok, sizeof(BOOL)) != sizeof(BOOL)) |
| 1371 | { |
| 1372 | DEBUG(D_transport) |
| 1373 | debug_printf("pipe read from writing process: %s\n", strerror(errno)); |
| 1374 | save_errno = ERRNO_FILTER_FAIL; |
| 1375 | yield = FALSE; |
| 1376 | } |
| 1377 | else if (!ok) |
| 1378 | { |
| 1379 | int dummy = read(pfd[pipe_read], (void *)&save_errno, sizeof(int)); |
| 1380 | dummy = read(pfd[pipe_read], (void *)&tctx->addr->more_errno, sizeof(int)); |
| 1381 | dummy = read(pfd[pipe_read], (void *)&tctx->addr->delivery_usec, sizeof(int)); |
| 1382 | dummy = dummy; /* compiler quietening */ |
| 1383 | yield = FALSE; |
| 1384 | } |
| 1385 | } |
| 1386 | else |
| 1387 | { |
| 1388 | yield = FALSE; |
| 1389 | save_errno = ERRNO_FILTER_FAIL; |
| 1390 | tctx->addr->more_errno = rc; |
| 1391 | DEBUG(D_transport) debug_printf("writing process returned %d\n", rc); |
| 1392 | } |
| 1393 | } |
| 1394 | (void)close(pfd[pipe_read]); |
| 1395 | |
| 1396 | /* If there have been no problems we can now add the terminating "." if this is |
| 1397 | SMTP output, turning off escaping beforehand. If the last character from the |
| 1398 | filter was not NL, insert a NL to make the SMTP protocol work. */ |
| 1399 | |
| 1400 | if (yield) |
| 1401 | { |
| 1402 | nl_check_length = nl_escape_length = 0; |
| 1403 | f.spool_file_wireformat = FALSE; |
| 1404 | if ( tctx->options & topt_end_dot |
| 1405 | && ( last_filter_was_NL |
| 1406 | ? !write_chunk(tctx, US".\n", 2) |
| 1407 | : !write_chunk(tctx, US"\n.\n", 3) |
| 1408 | ) ) |
| 1409 | yield = FALSE; |
| 1410 | |
| 1411 | /* Write out any remaining data in the buffer. */ |
| 1412 | |
| 1413 | else |
| 1414 | yield = (len = chunk_ptr - deliver_out_buffer) <= 0 |
| 1415 | || transport_write_block(tctx, deliver_out_buffer, len, FALSE); |
| 1416 | } |
| 1417 | else |
| 1418 | errno = save_errno; /* From some earlier error */ |
| 1419 | |
| 1420 | DEBUG(D_transport) |
| 1421 | { |
| 1422 | debug_printf("end of filtering transport writing: yield=%d\n", yield); |
| 1423 | if (!yield) |
| 1424 | debug_printf("errno=%d more_errno=%d\n", errno, tctx->addr->more_errno); |
| 1425 | } |
| 1426 | |
| 1427 | return yield; |
| 1428 | } |
| 1429 | |
| 1430 | |
| 1431 | |
| 1432 | |
| 1433 | |
| 1434 | /************************************************* |
| 1435 | * Update waiting database * |
| 1436 | *************************************************/ |
| 1437 | |
| 1438 | /* This is called when an address is deferred by remote transports that are |
| 1439 | capable of sending more than one message over one connection. A database is |
| 1440 | maintained for each transport, keeping track of which messages are waiting for |
| 1441 | which hosts. The transport can then consult this when eventually a successful |
| 1442 | delivery happens, and if it finds that another message is waiting for the same |
| 1443 | host, it can fire up a new process to deal with it using the same connection. |
| 1444 | |
| 1445 | The database records are keyed by host name. They can get full if there are |
| 1446 | lots of messages waiting, and so there is a continuation mechanism for them. |
| 1447 | |
| 1448 | Each record contains a list of message ids, packed end to end without any |
| 1449 | zeros. Each one is MESSAGE_ID_LENGTH bytes long. The count field says how many |
| 1450 | in this record, and the sequence field says if there are any other records for |
| 1451 | this host. If the sequence field is 0, there are none. If it is 1, then another |
| 1452 | record with the name <hostname>:0 exists; if it is 2, then two other records |
| 1453 | with sequence numbers 0 and 1 exist, and so on. |
| 1454 | |
| 1455 | Currently, an exhaustive search of all continuation records has to be done to |
| 1456 | determine whether to add a message id to a given record. This shouldn't be |
| 1457 | too bad except in extreme cases. I can't figure out a *simple* way of doing |
| 1458 | better. |
| 1459 | |
| 1460 | Old records should eventually get swept up by the exim_tidydb utility. |
| 1461 | |
| 1462 | Arguments: |
| 1463 | hostlist list of hosts that this message could be sent to |
| 1464 | tpname name of the transport |
| 1465 | |
| 1466 | Returns: nothing |
| 1467 | */ |
| 1468 | |
| 1469 | void |
| 1470 | transport_update_waiting(host_item *hostlist, uschar *tpname) |
| 1471 | { |
| 1472 | const uschar *prevname = US""; |
| 1473 | open_db dbblock; |
| 1474 | open_db *dbm_file; |
| 1475 | |
| 1476 | DEBUG(D_transport) debug_printf("updating wait-%s database\n", tpname); |
| 1477 | |
| 1478 | /* Open the database for this transport */ |
| 1479 | |
| 1480 | if (!(dbm_file = dbfn_open(string_sprintf("wait-%.200s", tpname), |
| 1481 | O_RDWR, &dbblock, TRUE, TRUE))) |
| 1482 | return; |
| 1483 | |
| 1484 | /* Scan the list of hosts for which this message is waiting, and ensure |
| 1485 | that the message id is in each host record. */ |
| 1486 | |
| 1487 | for (host_item * host = hostlist; host; host = host->next) |
| 1488 | { |
| 1489 | BOOL already = FALSE; |
| 1490 | dbdata_wait *host_record; |
| 1491 | int host_length; |
| 1492 | uschar buffer[256]; |
| 1493 | |
| 1494 | /* Skip if this is the same host as we just processed; otherwise remember |
| 1495 | the name for next time. */ |
| 1496 | |
| 1497 | if (Ustrcmp(prevname, host->name) == 0) continue; |
| 1498 | prevname = host->name; |
| 1499 | |
| 1500 | /* Look up the host record; if there isn't one, make an empty one. */ |
| 1501 | |
| 1502 | if (!(host_record = dbfn_read(dbm_file, host->name))) |
| 1503 | { |
| 1504 | host_record = store_get(sizeof(dbdata_wait) + MESSAGE_ID_LENGTH, FALSE); |
| 1505 | host_record->count = host_record->sequence = 0; |
| 1506 | } |
| 1507 | |
| 1508 | /* Compute the current length */ |
| 1509 | |
| 1510 | host_length = host_record->count * MESSAGE_ID_LENGTH; |
| 1511 | |
| 1512 | /* Search the record to see if the current message is already in it. */ |
| 1513 | |
| 1514 | for (uschar * s = host_record->text; s < host_record->text + host_length; |
| 1515 | s += MESSAGE_ID_LENGTH) |
| 1516 | if (Ustrncmp(s, message_id, MESSAGE_ID_LENGTH) == 0) |
| 1517 | { already = TRUE; break; } |
| 1518 | |
| 1519 | /* If we haven't found this message in the main record, search any |
| 1520 | continuation records that exist. */ |
| 1521 | |
| 1522 | for (int i = host_record->sequence - 1; i >= 0 && !already; i--) |
| 1523 | { |
| 1524 | dbdata_wait *cont; |
| 1525 | sprintf(CS buffer, "%.200s:%d", host->name, i); |
| 1526 | if ((cont = dbfn_read(dbm_file, buffer))) |
| 1527 | { |
| 1528 | int clen = cont->count * MESSAGE_ID_LENGTH; |
| 1529 | for (uschar * s = cont->text; s < cont->text + clen; s += MESSAGE_ID_LENGTH) |
| 1530 | if (Ustrncmp(s, message_id, MESSAGE_ID_LENGTH) == 0) |
| 1531 | { already = TRUE; break; } |
| 1532 | } |
| 1533 | } |
| 1534 | |
| 1535 | /* If this message is already in a record, no need to update. */ |
| 1536 | |
| 1537 | if (already) |
| 1538 | { |
| 1539 | DEBUG(D_transport) debug_printf("already listed for %s\n", host->name); |
| 1540 | continue; |
| 1541 | } |
| 1542 | |
| 1543 | |
| 1544 | /* If this record is full, write it out with a new name constructed |
| 1545 | from the sequence number, increase the sequence number, and empty |
| 1546 | the record. */ |
| 1547 | |
| 1548 | if (host_record->count >= WAIT_NAME_MAX) |
| 1549 | { |
| 1550 | sprintf(CS buffer, "%.200s:%d", host->name, host_record->sequence); |
| 1551 | dbfn_write(dbm_file, buffer, host_record, sizeof(dbdata_wait) + host_length); |
| 1552 | host_record->sequence++; |
| 1553 | host_record->count = 0; |
| 1554 | host_length = 0; |
| 1555 | } |
| 1556 | |
| 1557 | /* If this record is not full, increase the size of the record to |
| 1558 | allow for one new message id. */ |
| 1559 | |
| 1560 | else |
| 1561 | { |
| 1562 | dbdata_wait *newr = |
| 1563 | store_get(sizeof(dbdata_wait) + host_length + MESSAGE_ID_LENGTH, FALSE); |
| 1564 | memcpy(newr, host_record, sizeof(dbdata_wait) + host_length); |
| 1565 | host_record = newr; |
| 1566 | } |
| 1567 | |
| 1568 | /* Now add the new name on the end */ |
| 1569 | |
| 1570 | memcpy(host_record->text + host_length, message_id, MESSAGE_ID_LENGTH); |
| 1571 | host_record->count++; |
| 1572 | host_length += MESSAGE_ID_LENGTH; |
| 1573 | |
| 1574 | /* Update the database */ |
| 1575 | |
| 1576 | dbfn_write(dbm_file, host->name, host_record, sizeof(dbdata_wait) + host_length); |
| 1577 | DEBUG(D_transport) debug_printf("added to list for %s\n", host->name); |
| 1578 | } |
| 1579 | |
| 1580 | /* All now done */ |
| 1581 | |
| 1582 | dbfn_close(dbm_file); |
| 1583 | } |
| 1584 | |
| 1585 | |
| 1586 | |
| 1587 | |
| 1588 | /************************************************* |
| 1589 | * Test for waiting messages * |
| 1590 | *************************************************/ |
| 1591 | |
| 1592 | /* This function is called by a remote transport which uses the previous |
| 1593 | function to remember which messages are waiting for which remote hosts. It's |
| 1594 | called after a successful delivery and its job is to check whether there is |
| 1595 | another message waiting for the same host. However, it doesn't do this if the |
| 1596 | current continue sequence is greater than the maximum supplied as an argument, |
| 1597 | or greater than the global connection_max_messages, which, if set, overrides. |
| 1598 | |
| 1599 | Arguments: |
| 1600 | transport_name name of the transport |
| 1601 | hostname name of the host |
| 1602 | local_message_max maximum number of messages down one connection |
| 1603 | as set by the caller transport |
| 1604 | new_message_id set to the message id of a waiting message |
| 1605 | more set TRUE if there are yet more messages waiting |
| 1606 | oicf_func function to call to validate if it is ok to send |
| 1607 | to this message_id from the current instance. |
| 1608 | oicf_data opaque data for oicf_func |
| 1609 | |
| 1610 | Returns: TRUE if new_message_id set; FALSE otherwise |
| 1611 | */ |
| 1612 | |
| 1613 | typedef struct msgq_s |
| 1614 | { |
| 1615 | uschar message_id [MESSAGE_ID_LENGTH + 1]; |
| 1616 | BOOL bKeep; |
| 1617 | } msgq_t; |
| 1618 | |
| 1619 | BOOL |
| 1620 | transport_check_waiting(const uschar *transport_name, const uschar *hostname, |
| 1621 | int local_message_max, uschar *new_message_id, BOOL *more, oicf oicf_func, void *oicf_data) |
| 1622 | { |
| 1623 | dbdata_wait *host_record; |
| 1624 | int host_length; |
| 1625 | open_db dbblock; |
| 1626 | open_db *dbm_file; |
| 1627 | |
| 1628 | int i; |
| 1629 | struct stat statbuf; |
| 1630 | |
| 1631 | *more = FALSE; |
| 1632 | |
| 1633 | DEBUG(D_transport) |
| 1634 | { |
| 1635 | debug_printf("transport_check_waiting entered\n"); |
| 1636 | debug_printf(" sequence=%d local_max=%d global_max=%d\n", |
| 1637 | continue_sequence, local_message_max, connection_max_messages); |
| 1638 | } |
| 1639 | |
| 1640 | /* Do nothing if we have hit the maximum number that can be send down one |
| 1641 | connection. */ |
| 1642 | |
| 1643 | if (connection_max_messages >= 0) local_message_max = connection_max_messages; |
| 1644 | if (local_message_max > 0 && continue_sequence >= local_message_max) |
| 1645 | { |
| 1646 | DEBUG(D_transport) |
| 1647 | debug_printf("max messages for one connection reached: returning\n"); |
| 1648 | return FALSE; |
| 1649 | } |
| 1650 | |
| 1651 | /* Open the waiting information database. */ |
| 1652 | |
| 1653 | if (!(dbm_file = dbfn_open(string_sprintf("wait-%.200s", transport_name), |
| 1654 | O_RDWR, &dbblock, TRUE, TRUE))) |
| 1655 | return FALSE; |
| 1656 | |
| 1657 | /* See if there is a record for this host; if not, there's nothing to do. */ |
| 1658 | |
| 1659 | if (!(host_record = dbfn_read(dbm_file, hostname))) |
| 1660 | { |
| 1661 | dbfn_close(dbm_file); |
| 1662 | DEBUG(D_transport) debug_printf("no messages waiting for %s\n", hostname); |
| 1663 | return FALSE; |
| 1664 | } |
| 1665 | |
| 1666 | /* If the data in the record looks corrupt, just log something and |
| 1667 | don't try to use it. */ |
| 1668 | |
| 1669 | if (host_record->count > WAIT_NAME_MAX) |
| 1670 | { |
| 1671 | dbfn_close(dbm_file); |
| 1672 | log_write(0, LOG_MAIN|LOG_PANIC, "smtp-wait database entry for %s has bad " |
| 1673 | "count=%d (max=%d)", hostname, host_record->count, WAIT_NAME_MAX); |
| 1674 | return FALSE; |
| 1675 | } |
| 1676 | |
| 1677 | /* Scan the message ids in the record from the end towards the beginning, |
| 1678 | until one is found for which a spool file actually exists. If the record gets |
| 1679 | emptied, delete it and continue with any continuation records that may exist. |
| 1680 | */ |
| 1681 | |
| 1682 | /* For Bug 1141, I refactored this major portion of the routine, it is risky |
| 1683 | but the 1 off will remain without it. This code now allows me to SKIP over |
| 1684 | a message I do not want to send out on this run. */ |
| 1685 | |
| 1686 | host_length = host_record->count * MESSAGE_ID_LENGTH; |
| 1687 | |
| 1688 | while (1) |
| 1689 | { |
| 1690 | msgq_t *msgq; |
| 1691 | int msgq_count = 0; |
| 1692 | int msgq_actual = 0; |
| 1693 | BOOL bFound = FALSE; |
| 1694 | BOOL bContinuation = FALSE; |
| 1695 | |
| 1696 | /* create an array to read entire message queue into memory for processing */ |
| 1697 | |
| 1698 | msgq = store_get(sizeof(msgq_t) * host_record->count, FALSE); |
| 1699 | msgq_count = host_record->count; |
| 1700 | msgq_actual = msgq_count; |
| 1701 | |
| 1702 | for (i = 0; i < host_record->count; ++i) |
| 1703 | { |
| 1704 | msgq[i].bKeep = TRUE; |
| 1705 | |
| 1706 | Ustrncpy_nt(msgq[i].message_id, host_record->text + (i * MESSAGE_ID_LENGTH), |
| 1707 | MESSAGE_ID_LENGTH); |
| 1708 | msgq[i].message_id[MESSAGE_ID_LENGTH] = 0; |
| 1709 | } |
| 1710 | |
| 1711 | /* first thing remove current message id if it exists */ |
| 1712 | |
| 1713 | for (i = 0; i < msgq_count; ++i) |
| 1714 | if (Ustrcmp(msgq[i].message_id, message_id) == 0) |
| 1715 | { |
| 1716 | msgq[i].bKeep = FALSE; |
| 1717 | break; |
| 1718 | } |
| 1719 | |
| 1720 | /* now find the next acceptable message_id */ |
| 1721 | |
| 1722 | for (i = msgq_count - 1; i >= 0; --i) if (msgq[i].bKeep) |
| 1723 | { |
| 1724 | uschar subdir[2]; |
| 1725 | uschar * mid = msgq[i].message_id; |
| 1726 | |
| 1727 | set_subdir_str(subdir, mid, 0); |
| 1728 | if (Ustat(spool_fname(US"input", subdir, mid, US"-D"), &statbuf) != 0) |
| 1729 | msgq[i].bKeep = FALSE; |
| 1730 | else if (!oicf_func || oicf_func(mid, oicf_data)) |
| 1731 | { |
| 1732 | Ustrcpy_nt(new_message_id, mid); |
| 1733 | msgq[i].bKeep = FALSE; |
| 1734 | bFound = TRUE; |
| 1735 | break; |
| 1736 | } |
| 1737 | } |
| 1738 | |
| 1739 | /* re-count */ |
| 1740 | for (msgq_actual = 0, i = 0; i < msgq_count; ++i) |
| 1741 | if (msgq[i].bKeep) |
| 1742 | msgq_actual++; |
| 1743 | |
| 1744 | /* reassemble the host record, based on removed message ids, from in |
| 1745 | memory queue */ |
| 1746 | |
| 1747 | if (msgq_actual <= 0) |
| 1748 | { |
| 1749 | host_length = 0; |
| 1750 | host_record->count = 0; |
| 1751 | } |
| 1752 | else |
| 1753 | { |
| 1754 | host_length = msgq_actual * MESSAGE_ID_LENGTH; |
| 1755 | host_record->count = msgq_actual; |
| 1756 | |
| 1757 | if (msgq_actual < msgq_count) |
| 1758 | { |
| 1759 | int new_count; |
| 1760 | for (new_count = 0, i = 0; i < msgq_count; ++i) |
| 1761 | if (msgq[i].bKeep) |
| 1762 | Ustrncpy(&host_record->text[new_count++ * MESSAGE_ID_LENGTH], |
| 1763 | msgq[i].message_id, MESSAGE_ID_LENGTH); |
| 1764 | |
| 1765 | host_record->text[new_count * MESSAGE_ID_LENGTH] = 0; |
| 1766 | } |
| 1767 | } |
| 1768 | |
| 1769 | /* Check for a continuation record. */ |
| 1770 | |
| 1771 | while (host_length <= 0) |
| 1772 | { |
| 1773 | dbdata_wait * newr = NULL; |
| 1774 | uschar buffer[256]; |
| 1775 | |
| 1776 | /* Search for a continuation */ |
| 1777 | |
| 1778 | for (int i = host_record->sequence - 1; i >= 0 && !newr; i--) |
| 1779 | { |
| 1780 | sprintf(CS buffer, "%.200s:%d", hostname, i); |
| 1781 | newr = dbfn_read(dbm_file, buffer); |
| 1782 | } |
| 1783 | |
| 1784 | /* If no continuation, delete the current and break the loop */ |
| 1785 | |
| 1786 | if (!newr) |
| 1787 | { |
| 1788 | dbfn_delete(dbm_file, hostname); |
| 1789 | break; |
| 1790 | } |
| 1791 | |
| 1792 | /* Else replace the current with the continuation */ |
| 1793 | |
| 1794 | dbfn_delete(dbm_file, buffer); |
| 1795 | host_record = newr; |
| 1796 | host_length = host_record->count * MESSAGE_ID_LENGTH; |
| 1797 | |
| 1798 | bContinuation = TRUE; |
| 1799 | } |
| 1800 | |
| 1801 | if (bFound) /* Usual exit from main loop */ |
| 1802 | break; |
| 1803 | |
| 1804 | /* If host_length <= 0 we have emptied a record and not found a good message, |
| 1805 | and there are no continuation records. Otherwise there is a continuation |
| 1806 | record to process. */ |
| 1807 | |
| 1808 | if (host_length <= 0) |
| 1809 | { |
| 1810 | dbfn_close(dbm_file); |
| 1811 | DEBUG(D_transport) debug_printf("waiting messages already delivered\n"); |
| 1812 | return FALSE; |
| 1813 | } |
| 1814 | |
| 1815 | /* we were not able to find an acceptable message, nor was there a |
| 1816 | * continuation record. So bug out, outer logic will clean this up. |
| 1817 | */ |
| 1818 | |
| 1819 | if (!bContinuation) |
| 1820 | { |
| 1821 | Ustrcpy(new_message_id, message_id); |
| 1822 | dbfn_close(dbm_file); |
| 1823 | return FALSE; |
| 1824 | } |
| 1825 | } /* we need to process a continuation record */ |
| 1826 | |
| 1827 | /* Control gets here when an existing message has been encountered; its |
| 1828 | id is in new_message_id, and host_length is the revised length of the |
| 1829 | host record. If it is zero, the record has been removed. Update the |
| 1830 | record if required, close the database, and return TRUE. */ |
| 1831 | |
| 1832 | if (host_length > 0) |
| 1833 | { |
| 1834 | host_record->count = host_length/MESSAGE_ID_LENGTH; |
| 1835 | |
| 1836 | dbfn_write(dbm_file, hostname, host_record, (int)sizeof(dbdata_wait) + host_length); |
| 1837 | *more = TRUE; |
| 1838 | } |
| 1839 | |
| 1840 | dbfn_close(dbm_file); |
| 1841 | return TRUE; |
| 1842 | } |
| 1843 | |
| 1844 | /************************************************* |
| 1845 | * Deliver waiting message down same socket * |
| 1846 | *************************************************/ |
| 1847 | |
| 1848 | /* Just the regain-root-privilege exec portion */ |
| 1849 | void |
| 1850 | transport_do_pass_socket(const uschar *transport_name, const uschar *hostname, |
| 1851 | const uschar *hostaddress, uschar *id, int socket_fd) |
| 1852 | { |
| 1853 | int i = 20; |
| 1854 | const uschar **argv; |
| 1855 | |
| 1856 | /* Set up the calling arguments; use the standard function for the basics, |
| 1857 | but we have a number of extras that may be added. */ |
| 1858 | |
| 1859 | argv = CUSS child_exec_exim(CEE_RETURN_ARGV, TRUE, &i, FALSE, 0); |
| 1860 | |
| 1861 | if (f.smtp_authenticated) argv[i++] = US"-MCA"; |
| 1862 | if (smtp_peer_options & OPTION_CHUNKING) argv[i++] = US"-MCK"; |
| 1863 | if (smtp_peer_options & OPTION_DSN) argv[i++] = US"-MCD"; |
| 1864 | if (smtp_peer_options & OPTION_PIPE) argv[i++] = US"-MCP"; |
| 1865 | if (smtp_peer_options & OPTION_SIZE) argv[i++] = US"-MCS"; |
| 1866 | #ifndef DISABLE_TLS |
| 1867 | if (smtp_peer_options & OPTION_TLS) |
| 1868 | if (tls_out.active.sock >= 0 || continue_proxy_cipher) |
| 1869 | { |
| 1870 | argv[i++] = US"-MCt"; |
| 1871 | argv[i++] = sending_ip_address; |
| 1872 | argv[i++] = string_sprintf("%d", sending_port); |
| 1873 | argv[i++] = tls_out.active.sock >= 0 ? tls_out.cipher : continue_proxy_cipher; |
| 1874 | } |
| 1875 | else |
| 1876 | argv[i++] = US"-MCT"; |
| 1877 | #endif |
| 1878 | |
| 1879 | if (queue_run_pid != (pid_t)0) |
| 1880 | { |
| 1881 | argv[i++] = US"-MCQ"; |
| 1882 | argv[i++] = string_sprintf("%d", queue_run_pid); |
| 1883 | argv[i++] = string_sprintf("%d", queue_run_pipe); |
| 1884 | } |
| 1885 | |
| 1886 | argv[i++] = US"-MC"; |
| 1887 | argv[i++] = US transport_name; |
| 1888 | argv[i++] = US hostname; |
| 1889 | argv[i++] = US hostaddress; |
| 1890 | argv[i++] = string_sprintf("%d", continue_sequence + 1); |
| 1891 | argv[i++] = id; |
| 1892 | argv[i++] = NULL; |
| 1893 | |
| 1894 | /* Arrange for the channel to be on stdin. */ |
| 1895 | |
| 1896 | if (socket_fd != 0) |
| 1897 | { |
| 1898 | (void)dup2(socket_fd, 0); |
| 1899 | (void)close(socket_fd); |
| 1900 | } |
| 1901 | |
| 1902 | DEBUG(D_exec) debug_print_argv(argv); |
| 1903 | exim_nullstd(); /* Ensure std{out,err} exist */ |
| 1904 | execv(CS argv[0], (char *const *)argv); |
| 1905 | |
| 1906 | DEBUG(D_any) debug_printf("execv failed: %s\n", strerror(errno)); |
| 1907 | _exit(errno); /* Note: must be _exit(), NOT exit() */ |
| 1908 | } |
| 1909 | |
| 1910 | |
| 1911 | |
| 1912 | /* Fork a new exim process to deliver the message, and do a re-exec, both to |
| 1913 | get a clean delivery process, and to regain root privilege in cases where it |
| 1914 | has been given away. |
| 1915 | |
| 1916 | Arguments: |
| 1917 | transport_name to pass to the new process |
| 1918 | hostname ditto |
| 1919 | hostaddress ditto |
| 1920 | id the new message to process |
| 1921 | socket_fd the connected socket |
| 1922 | |
| 1923 | Returns: FALSE if fork fails; TRUE otherwise |
| 1924 | */ |
| 1925 | |
| 1926 | BOOL |
| 1927 | transport_pass_socket(const uschar *transport_name, const uschar *hostname, |
| 1928 | const uschar *hostaddress, uschar *id, int socket_fd) |
| 1929 | { |
| 1930 | pid_t pid; |
| 1931 | int status; |
| 1932 | |
| 1933 | DEBUG(D_transport) debug_printf("transport_pass_socket entered\n"); |
| 1934 | |
| 1935 | if ((pid = fork()) == 0) |
| 1936 | { |
| 1937 | /* Disconnect entirely from the parent process. If we are running in the |
| 1938 | test harness, wait for a bit to allow the previous process time to finish, |
| 1939 | write the log, etc., so that the output is always in the same order for |
| 1940 | automatic comparison. */ |
| 1941 | |
| 1942 | if ((pid = fork()) != 0) |
| 1943 | { |
| 1944 | DEBUG(D_transport) debug_printf("transport_pass_socket succeeded (final-pid %d)\n", pid); |
| 1945 | _exit(EXIT_SUCCESS); |
| 1946 | } |
| 1947 | testharness_pause_ms(1000); |
| 1948 | |
| 1949 | transport_do_pass_socket(transport_name, hostname, hostaddress, |
| 1950 | id, socket_fd); |
| 1951 | } |
| 1952 | |
| 1953 | /* If the process creation succeeded, wait for the first-level child, which |
| 1954 | immediately exits, leaving the second level process entirely disconnected from |
| 1955 | this one. */ |
| 1956 | |
| 1957 | if (pid > 0) |
| 1958 | { |
| 1959 | int rc; |
| 1960 | while ((rc = wait(&status)) != pid && (rc >= 0 || errno != ECHILD)); |
| 1961 | DEBUG(D_transport) debug_printf("transport_pass_socket succeeded (inter-pid %d)\n", pid); |
| 1962 | return TRUE; |
| 1963 | } |
| 1964 | else |
| 1965 | { |
| 1966 | DEBUG(D_transport) debug_printf("transport_pass_socket failed to fork: %s\n", |
| 1967 | strerror(errno)); |
| 1968 | return FALSE; |
| 1969 | } |
| 1970 | } |
| 1971 | |
| 1972 | |
| 1973 | |
| 1974 | /************************************************* |
| 1975 | * Set up direct (non-shell) command * |
| 1976 | *************************************************/ |
| 1977 | |
| 1978 | /* This function is called when a command line is to be parsed and executed |
| 1979 | directly, without the use of /bin/sh. It is called by the pipe transport, |
| 1980 | the queryprogram router, and also from the main delivery code when setting up a |
| 1981 | transport filter process. The code for ETRN also makes use of this; in that |
| 1982 | case, no addresses are passed. |
| 1983 | |
| 1984 | Arguments: |
| 1985 | argvptr pointer to anchor for argv vector |
| 1986 | cmd points to the command string (modified IN PLACE) |
| 1987 | expand_arguments true if expansion is to occur |
| 1988 | expand_failed error value to set if expansion fails; not relevant if |
| 1989 | addr == NULL |
| 1990 | addr chain of addresses, or NULL |
| 1991 | etext text for use in error messages |
| 1992 | errptr where to put error message if addr is NULL; |
| 1993 | otherwise it is put in the first address |
| 1994 | |
| 1995 | Returns: TRUE if all went well; otherwise an error will be |
| 1996 | set in the first address and FALSE returned |
| 1997 | */ |
| 1998 | |
| 1999 | BOOL |
| 2000 | transport_set_up_command(const uschar ***argvptr, uschar *cmd, |
| 2001 | BOOL expand_arguments, int expand_failed, address_item *addr, |
| 2002 | uschar *etext, uschar **errptr) |
| 2003 | { |
| 2004 | const uschar **argv; |
| 2005 | uschar *s, *ss; |
| 2006 | int address_count = 0; |
| 2007 | int argcount = 0; |
| 2008 | int max_args; |
| 2009 | |
| 2010 | /* Get store in which to build an argument list. Count the number of addresses |
| 2011 | supplied, and allow for that many arguments, plus an additional 60, which |
| 2012 | should be enough for anybody. Multiple addresses happen only when the local |
| 2013 | delivery batch option is set. */ |
| 2014 | |
| 2015 | for (address_item * ad = addr; ad; ad = ad->next) address_count++; |
| 2016 | max_args = address_count + 60; |
| 2017 | *argvptr = argv = store_get((max_args+1)*sizeof(uschar *), FALSE); |
| 2018 | |
| 2019 | /* Split the command up into arguments terminated by white space. Lose |
| 2020 | trailing space at the start and end. Double-quoted arguments can contain \\ and |
| 2021 | \" escapes and so can be handled by the standard function; single-quoted |
| 2022 | arguments are verbatim. Copy each argument into a new string. */ |
| 2023 | |
| 2024 | s = cmd; |
| 2025 | while (isspace(*s)) s++; |
| 2026 | |
| 2027 | for (; *s != 0 && argcount < max_args; argcount++) |
| 2028 | { |
| 2029 | if (*s == '\'') |
| 2030 | { |
| 2031 | ss = s + 1; |
| 2032 | while (*ss != 0 && *ss != '\'') ss++; |
| 2033 | argv[argcount] = ss = store_get(ss - s++, is_tainted(cmd)); |
| 2034 | while (*s != 0 && *s != '\'') *ss++ = *s++; |
| 2035 | if (*s != 0) s++; |
| 2036 | *ss++ = 0; |
| 2037 | } |
| 2038 | else |
| 2039 | argv[argcount] = string_dequote(CUSS &s); |
| 2040 | while (isspace(*s)) s++; |
| 2041 | } |
| 2042 | |
| 2043 | argv[argcount] = US 0; |
| 2044 | |
| 2045 | /* If *s != 0 we have run out of argument slots. */ |
| 2046 | |
| 2047 | if (*s != 0) |
| 2048 | { |
| 2049 | uschar *msg = string_sprintf("Too many arguments in command \"%s\" in " |
| 2050 | "%s", cmd, etext); |
| 2051 | if (addr != NULL) |
| 2052 | { |
| 2053 | addr->transport_return = FAIL; |
| 2054 | addr->message = msg; |
| 2055 | } |
| 2056 | else *errptr = msg; |
| 2057 | return FALSE; |
| 2058 | } |
| 2059 | |
| 2060 | /* Expand each individual argument if required. Expansion happens for pipes set |
| 2061 | up in filter files and with directly-supplied commands. It does not happen if |
| 2062 | the pipe comes from a traditional .forward file. A failing expansion is a big |
| 2063 | disaster if the command came from Exim's configuration; if it came from a user |
| 2064 | it is just a normal failure. The expand_failed value is used as the error value |
| 2065 | to cater for these two cases. |
| 2066 | |
| 2067 | An argument consisting just of the text "$pipe_addresses" is treated specially. |
| 2068 | It is not passed to the general expansion function. Instead, it is replaced by |
| 2069 | a number of arguments, one for each address. This avoids problems with shell |
| 2070 | metacharacters and spaces in addresses. |
| 2071 | |
| 2072 | If the parent of the top address has an original part of "system-filter", this |
| 2073 | pipe was set up by the system filter, and we can permit the expansion of |
| 2074 | $recipients. */ |
| 2075 | |
| 2076 | DEBUG(D_transport) |
| 2077 | { |
| 2078 | debug_printf("direct command:\n"); |
| 2079 | for (int i = 0; argv[i]; i++) |
| 2080 | debug_printf(" argv[%d] = '%s'\n", i, string_printing(argv[i])); |
| 2081 | } |
| 2082 | |
| 2083 | if (expand_arguments) |
| 2084 | { |
| 2085 | BOOL allow_dollar_recipients = addr != NULL && |
| 2086 | addr->parent != NULL && |
| 2087 | Ustrcmp(addr->parent->address, "system-filter") == 0; |
| 2088 | |
| 2089 | for (int i = 0; argv[i] != US 0; i++) |
| 2090 | { |
| 2091 | |
| 2092 | /* Handle special fudge for passing an address list */ |
| 2093 | |
| 2094 | if (addr != NULL && |
| 2095 | (Ustrcmp(argv[i], "$pipe_addresses") == 0 || |
| 2096 | Ustrcmp(argv[i], "${pipe_addresses}") == 0)) |
| 2097 | { |
| 2098 | int additional; |
| 2099 | |
| 2100 | if (argcount + address_count - 1 > max_args) |
| 2101 | { |
| 2102 | addr->transport_return = FAIL; |
| 2103 | addr->message = string_sprintf("Too many arguments to command \"%s\" " |
| 2104 | "in %s", cmd, etext); |
| 2105 | return FALSE; |
| 2106 | } |
| 2107 | |
| 2108 | additional = address_count - 1; |
| 2109 | if (additional > 0) |
| 2110 | memmove(argv + i + 1 + additional, argv + i + 1, |
| 2111 | (argcount - i)*sizeof(uschar *)); |
| 2112 | |
| 2113 | for (address_item * ad = addr; ad; ad = ad->next) |
| 2114 | { |
| 2115 | argv[i++] = ad->address; |
| 2116 | argcount++; |
| 2117 | } |
| 2118 | |
| 2119 | /* Subtract one since we replace $pipe_addresses */ |
| 2120 | argcount--; |
| 2121 | i--; |
| 2122 | } |
| 2123 | |
| 2124 | /* Handle special case of $address_pipe when af_force_command is set */ |
| 2125 | |
| 2126 | else if (addr != NULL && testflag(addr,af_force_command) && |
| 2127 | (Ustrcmp(argv[i], "$address_pipe") == 0 || |
| 2128 | Ustrcmp(argv[i], "${address_pipe}") == 0)) |
| 2129 | { |
| 2130 | int address_pipe_argcount = 0; |
| 2131 | int address_pipe_max_args; |
| 2132 | uschar **address_pipe_argv; |
| 2133 | BOOL tainted; |
| 2134 | |
| 2135 | /* We can never have more then the argv we will be loading into */ |
| 2136 | address_pipe_max_args = max_args - argcount + 1; |
| 2137 | |
| 2138 | DEBUG(D_transport) |
| 2139 | debug_printf("address_pipe_max_args=%d\n", address_pipe_max_args); |
| 2140 | |
| 2141 | /* We allocate an additional for (uschar *)0 */ |
| 2142 | address_pipe_argv = store_get((address_pipe_max_args+1)*sizeof(uschar *), FALSE); |
| 2143 | |
| 2144 | /* +1 because addr->local_part[0] == '|' since af_force_command is set */ |
| 2145 | s = expand_string(addr->local_part + 1); |
| 2146 | tainted = is_tainted(s); |
| 2147 | |
| 2148 | if (s == NULL || *s == '\0') |
| 2149 | { |
| 2150 | addr->transport_return = FAIL; |
| 2151 | addr->message = string_sprintf("Expansion of \"%s\" " |
| 2152 | "from command \"%s\" in %s failed: %s", |
| 2153 | (addr->local_part + 1), cmd, etext, expand_string_message); |
| 2154 | return FALSE; |
| 2155 | } |
| 2156 | |
| 2157 | while (isspace(*s)) s++; /* strip leading space */ |
| 2158 | |
| 2159 | while (*s != 0 && address_pipe_argcount < address_pipe_max_args) |
| 2160 | { |
| 2161 | if (*s == '\'') |
| 2162 | { |
| 2163 | ss = s + 1; |
| 2164 | while (*ss != 0 && *ss != '\'') ss++; |
| 2165 | address_pipe_argv[address_pipe_argcount++] = ss = store_get(ss - s++, tainted); |
| 2166 | while (*s != 0 && *s != '\'') *ss++ = *s++; |
| 2167 | if (*s != 0) s++; |
| 2168 | *ss++ = 0; |
| 2169 | } |
| 2170 | else address_pipe_argv[address_pipe_argcount++] = |
| 2171 | string_copy(string_dequote(CUSS &s)); |
| 2172 | while (isspace(*s)) s++; /* strip space after arg */ |
| 2173 | } |
| 2174 | |
| 2175 | address_pipe_argv[address_pipe_argcount] = US 0; |
| 2176 | |
| 2177 | /* If *s != 0 we have run out of argument slots. */ |
| 2178 | if (*s != 0) |
| 2179 | { |
| 2180 | uschar *msg = string_sprintf("Too many arguments in $address_pipe " |
| 2181 | "\"%s\" in %s", addr->local_part + 1, etext); |
| 2182 | if (addr != NULL) |
| 2183 | { |
| 2184 | addr->transport_return = FAIL; |
| 2185 | addr->message = msg; |
| 2186 | } |
| 2187 | else *errptr = msg; |
| 2188 | return FALSE; |
| 2189 | } |
| 2190 | |
| 2191 | /* address_pipe_argcount - 1 |
| 2192 | * because we are replacing $address_pipe in the argument list |
| 2193 | * with the first thing it expands to */ |
| 2194 | if (argcount + address_pipe_argcount - 1 > max_args) |
| 2195 | { |
| 2196 | addr->transport_return = FAIL; |
| 2197 | addr->message = string_sprintf("Too many arguments to command " |
| 2198 | "\"%s\" after expanding $address_pipe in %s", cmd, etext); |
| 2199 | return FALSE; |
| 2200 | } |
| 2201 | |
| 2202 | /* If we are not just able to replace the slot that contained |
| 2203 | * $address_pipe (address_pipe_argcount == 1) |
| 2204 | * We have to move the existing argv by address_pipe_argcount - 1 |
| 2205 | * Visually if address_pipe_argcount == 2: |
| 2206 | * [argv 0][argv 1][argv 2($address_pipe)][argv 3][0] |
| 2207 | * [argv 0][argv 1][ap_arg0][ap_arg1][old argv 3][0] |
| 2208 | */ |
| 2209 | if (address_pipe_argcount > 1) |
| 2210 | memmove( |
| 2211 | /* current position + additional args */ |
| 2212 | argv + i + address_pipe_argcount, |
| 2213 | /* current position + 1 (for the (uschar *)0 at the end) */ |
| 2214 | argv + i + 1, |
| 2215 | /* -1 for the (uschar *)0 at the end)*/ |
| 2216 | (argcount - i)*sizeof(uschar *) |
| 2217 | ); |
| 2218 | |
| 2219 | /* Now we fill in the slots we just moved argv out of |
| 2220 | * [argv 0][argv 1][argv 2=pipeargv[0]][argv 3=pipeargv[1]][old argv 3][0] |
| 2221 | */ |
| 2222 | for (int address_pipe_i = 0; |
| 2223 | address_pipe_argv[address_pipe_i] != US 0; |
| 2224 | address_pipe_i++) |
| 2225 | { |
| 2226 | argv[i++] = address_pipe_argv[address_pipe_i]; |
| 2227 | argcount++; |
| 2228 | } |
| 2229 | |
| 2230 | /* Subtract one since we replace $address_pipe */ |
| 2231 | argcount--; |
| 2232 | i--; |
| 2233 | } |
| 2234 | |
| 2235 | /* Handle normal expansion string */ |
| 2236 | |
| 2237 | else |
| 2238 | { |
| 2239 | const uschar *expanded_arg; |
| 2240 | f.enable_dollar_recipients = allow_dollar_recipients; |
| 2241 | expanded_arg = expand_cstring(argv[i]); |
| 2242 | f.enable_dollar_recipients = FALSE; |
| 2243 | |
| 2244 | if (!expanded_arg) |
| 2245 | { |
| 2246 | uschar *msg = string_sprintf("Expansion of \"%s\" " |
| 2247 | "from command \"%s\" in %s failed: %s", |
| 2248 | argv[i], cmd, etext, expand_string_message); |
| 2249 | if (addr) |
| 2250 | { |
| 2251 | addr->transport_return = expand_failed; |
| 2252 | addr->message = msg; |
| 2253 | } |
| 2254 | else *errptr = msg; |
| 2255 | return FALSE; |
| 2256 | } |
| 2257 | argv[i] = expanded_arg; |
| 2258 | } |
| 2259 | } |
| 2260 | |
| 2261 | DEBUG(D_transport) |
| 2262 | { |
| 2263 | debug_printf("direct command after expansion:\n"); |
| 2264 | for (int i = 0; argv[i] != US 0; i++) |
| 2265 | debug_printf(" argv[%d] = %s\n", i, string_printing(argv[i])); |
| 2266 | } |
| 2267 | } |
| 2268 | |
| 2269 | return TRUE; |
| 2270 | } |
| 2271 | |
| 2272 | #endif /*!MACRO_PREDEF*/ |
| 2273 | /* vi: aw ai sw=2 |
| 2274 | */ |
| 2275 | /* End of transport.c */ |