| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) University of Cambridge 1995 - 2016 */ |
| 6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | |
| 8 | |
| 9 | #include "../exim.h" |
| 10 | #include "lmtp.h" |
| 11 | |
| 12 | #define PENDING_OK 256 |
| 13 | |
| 14 | |
| 15 | /* Options specific to the lmtp transport. They must be in alphabetic |
| 16 | order (note that "_" comes before the lower case letters). Those starting |
| 17 | with "*" are not settable by the user but are used by the option-reading |
| 18 | software for alternative value types. Some options are stored in the transport |
| 19 | instance block so as to be publicly visible; these are flagged with opt_public. |
| 20 | */ |
| 21 | |
| 22 | optionlist lmtp_transport_options[] = { |
| 23 | { "batch_id", opt_stringptr | opt_public, |
| 24 | (void *)offsetof(transport_instance, batch_id) }, |
| 25 | { "batch_max", opt_int | opt_public, |
| 26 | (void *)offsetof(transport_instance, batch_max) }, |
| 27 | { "command", opt_stringptr, |
| 28 | (void *)offsetof(lmtp_transport_options_block, cmd) }, |
| 29 | { "ignore_quota", opt_bool, |
| 30 | (void *)offsetof(lmtp_transport_options_block, ignore_quota) }, |
| 31 | { "socket", opt_stringptr, |
| 32 | (void *)offsetof(lmtp_transport_options_block, skt) }, |
| 33 | { "timeout", opt_time, |
| 34 | (void *)offsetof(lmtp_transport_options_block, timeout) } |
| 35 | }; |
| 36 | |
| 37 | /* Size of the options list. An extern variable has to be used so that its |
| 38 | address can appear in the tables drtables.c. */ |
| 39 | |
| 40 | int lmtp_transport_options_count = |
| 41 | sizeof(lmtp_transport_options)/sizeof(optionlist); |
| 42 | |
| 43 | /* Default private options block for the lmtp transport. */ |
| 44 | |
| 45 | lmtp_transport_options_block lmtp_transport_option_defaults = { |
| 46 | NULL, /* cmd */ |
| 47 | NULL, /* skt */ |
| 48 | 5*60, /* timeout */ |
| 49 | 0, /* options */ |
| 50 | FALSE /* ignore_quota */ |
| 51 | }; |
| 52 | |
| 53 | |
| 54 | |
| 55 | /************************************************* |
| 56 | * Initialization entry point * |
| 57 | *************************************************/ |
| 58 | |
| 59 | /* Called for each instance, after its options have been read, to |
| 60 | enable consistency checks to be done, or anything else that needs |
| 61 | to be set up. */ |
| 62 | |
| 63 | void |
| 64 | lmtp_transport_init(transport_instance *tblock) |
| 65 | { |
| 66 | lmtp_transport_options_block *ob = |
| 67 | (lmtp_transport_options_block *)(tblock->options_block); |
| 68 | |
| 69 | /* Either the command field or the socket field must be set */ |
| 70 | |
| 71 | if ((ob->cmd == NULL) == (ob->skt == NULL)) |
| 72 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, |
| 73 | "one (and only one) of command or socket must be set for the %s transport", |
| 74 | tblock->name); |
| 75 | |
| 76 | /* If a fixed uid field is set, then a gid field must also be set. */ |
| 77 | |
| 78 | if (tblock->uid_set && !tblock->gid_set && tblock->expand_gid == NULL) |
| 79 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, |
| 80 | "user set without group for the %s transport", tblock->name); |
| 81 | |
| 82 | /* Set up the bitwise options for transport_write_message from the various |
| 83 | driver options. Only one of body_only and headers_only can be set. */ |
| 84 | |
| 85 | ob->options |= |
| 86 | (tblock->body_only? topt_no_headers : 0) | |
| 87 | (tblock->headers_only? topt_no_body : 0) | |
| 88 | (tblock->return_path_add? topt_add_return_path : 0) | |
| 89 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | |
| 90 | (tblock->envelope_to_add? topt_add_envelope_to : 0) | |
| 91 | topt_use_crlf | topt_end_dot; |
| 92 | } |
| 93 | |
| 94 | |
| 95 | /************************************************* |
| 96 | * Check an LMTP response * |
| 97 | *************************************************/ |
| 98 | |
| 99 | /* This function is given an errno code and the LMTP response buffer to |
| 100 | analyse. It sets an appropriate message and puts the first digit of the |
| 101 | response code into the yield variable. If no response was actually read, a |
| 102 | suitable digit is chosen. |
| 103 | |
| 104 | Arguments: |
| 105 | errno_value pointer to the errno value |
| 106 | more_errno from the top address for use with ERRNO_FILTER_FAIL |
| 107 | buffer the LMTP response buffer |
| 108 | yield where to put a one-digit LMTP response code |
| 109 | message where to put an error message |
| 110 | |
| 111 | Returns: TRUE if a "QUIT" command should be sent, else FALSE |
| 112 | */ |
| 113 | |
| 114 | static BOOL check_response(int *errno_value, int more_errno, uschar *buffer, |
| 115 | int *yield, uschar **message) |
| 116 | { |
| 117 | *yield = '4'; /* Default setting is to give a temporary error */ |
| 118 | |
| 119 | /* Handle response timeout */ |
| 120 | |
| 121 | if (*errno_value == ETIMEDOUT) |
| 122 | { |
| 123 | *message = string_sprintf("LMTP timeout after %s", big_buffer); |
| 124 | if (transport_count > 0) |
| 125 | *message = string_sprintf("%s (%d bytes written)", *message, |
| 126 | transport_count); |
| 127 | *errno_value = 0; |
| 128 | return FALSE; |
| 129 | } |
| 130 | |
| 131 | /* Handle malformed LMTP response */ |
| 132 | |
| 133 | if (*errno_value == ERRNO_SMTPFORMAT) |
| 134 | { |
| 135 | *message = string_sprintf("Malformed LMTP response after %s: %s", |
| 136 | big_buffer, string_printing(buffer)); |
| 137 | return FALSE; |
| 138 | } |
| 139 | |
| 140 | /* Handle a failed filter process error; can't send QUIT as we mustn't |
| 141 | end the DATA. */ |
| 142 | |
| 143 | if (*errno_value == ERRNO_FILTER_FAIL) |
| 144 | { |
| 145 | *message = string_sprintf("transport filter process failed (%d)%s", |
| 146 | more_errno, |
| 147 | (more_errno == EX_EXECFAILED)? ": unable to execute command" : ""); |
| 148 | return FALSE; |
| 149 | } |
| 150 | |
| 151 | /* Handle a failed add_headers expansion; can't send QUIT as we mustn't |
| 152 | end the DATA. */ |
| 153 | |
| 154 | if (*errno_value == ERRNO_CHHEADER_FAIL) |
| 155 | { |
| 156 | *message = |
| 157 | string_sprintf("failed to expand headers_add or headers_remove: %s", |
| 158 | expand_string_message); |
| 159 | return FALSE; |
| 160 | } |
| 161 | |
| 162 | /* Handle failure to write a complete data block */ |
| 163 | |
| 164 | if (*errno_value == ERRNO_WRITEINCOMPLETE) |
| 165 | { |
| 166 | *message = string_sprintf("failed to write a data block"); |
| 167 | return FALSE; |
| 168 | } |
| 169 | |
| 170 | /* Handle error responses from the remote process. */ |
| 171 | |
| 172 | if (buffer[0] != 0) |
| 173 | { |
| 174 | const uschar *s = string_printing(buffer); |
| 175 | *message = string_sprintf("LMTP error after %s: %s", big_buffer, s); |
| 176 | *yield = buffer[0]; |
| 177 | return TRUE; |
| 178 | } |
| 179 | |
| 180 | /* No data was read. If there is no errno, this must be the EOF (i.e. |
| 181 | connection closed) case, which causes deferral. Otherwise, leave the errno |
| 182 | value to be interpreted. In all cases, we have to assume the connection is now |
| 183 | dead. */ |
| 184 | |
| 185 | if (*errno_value == 0) |
| 186 | { |
| 187 | *errno_value = ERRNO_SMTPCLOSED; |
| 188 | *message = string_sprintf("LMTP connection closed after %s", big_buffer); |
| 189 | } |
| 190 | |
| 191 | return FALSE; |
| 192 | } |
| 193 | |
| 194 | |
| 195 | |
| 196 | /************************************************* |
| 197 | * Write LMTP command * |
| 198 | *************************************************/ |
| 199 | |
| 200 | /* The formatted command is left in big_buffer so that it can be reflected in |
| 201 | any error message. |
| 202 | |
| 203 | Arguments: |
| 204 | fd the fd to write to |
| 205 | format a format, starting with one of |
| 206 | of HELO, MAIL FROM, RCPT TO, DATA, ".", or QUIT. |
| 207 | ... data for the format |
| 208 | |
| 209 | Returns: TRUE if successful, FALSE if not, with errno set |
| 210 | */ |
| 211 | |
| 212 | static BOOL |
| 213 | lmtp_write_command(int fd, const char *format, ...) |
| 214 | { |
| 215 | int count, rc; |
| 216 | va_list ap; |
| 217 | va_start(ap, format); |
| 218 | if (!string_vformat(big_buffer, big_buffer_size, CS format, ap)) |
| 219 | { |
| 220 | va_end(ap); |
| 221 | errno = ERRNO_SMTPFORMAT; |
| 222 | return FALSE; |
| 223 | } |
| 224 | va_end(ap); |
| 225 | count = Ustrlen(big_buffer); |
| 226 | DEBUG(D_transport|D_v) debug_printf(" LMTP>> %s", big_buffer); |
| 227 | rc = write(fd, big_buffer, count); |
| 228 | big_buffer[count-2] = 0; /* remove \r\n for debug and error message */ |
| 229 | if (rc > 0) return TRUE; |
| 230 | DEBUG(D_transport) debug_printf("write failed: %s\n", strerror(errno)); |
| 231 | return FALSE; |
| 232 | } |
| 233 | |
| 234 | |
| 235 | |
| 236 | |
| 237 | /************************************************* |
| 238 | * Read LMTP response * |
| 239 | *************************************************/ |
| 240 | |
| 241 | /* This function reads an LMTP response with a timeout, and returns the |
| 242 | response in the given buffer. It also analyzes the first digit of the reply |
| 243 | code and returns FALSE if it is not acceptable. |
| 244 | |
| 245 | FALSE is also returned after a reading error. In this case buffer[0] will be |
| 246 | zero, and the error code will be in errno. |
| 247 | |
| 248 | Arguments: |
| 249 | f a file to read from |
| 250 | buffer where to put the response |
| 251 | size the size of the buffer |
| 252 | okdigit the expected first digit of the response |
| 253 | timeout the timeout to use |
| 254 | |
| 255 | Returns: TRUE if a valid, non-error response was received; else FALSE |
| 256 | */ |
| 257 | |
| 258 | static BOOL |
| 259 | lmtp_read_response(FILE *f, uschar *buffer, int size, int okdigit, int timeout) |
| 260 | { |
| 261 | int count; |
| 262 | uschar *ptr = buffer; |
| 263 | uschar *readptr = buffer; |
| 264 | |
| 265 | /* Ensure errno starts out zero */ |
| 266 | |
| 267 | errno = 0; |
| 268 | |
| 269 | /* Loop for handling LMTP responses that do not all come in one line. */ |
| 270 | |
| 271 | for (;;) |
| 272 | { |
| 273 | /* If buffer is too full, something has gone wrong. */ |
| 274 | |
| 275 | if (size < 10) |
| 276 | { |
| 277 | *readptr = 0; |
| 278 | errno = ERRNO_SMTPFORMAT; |
| 279 | return FALSE; |
| 280 | } |
| 281 | |
| 282 | /* Loop to cover the read getting interrupted. */ |
| 283 | |
| 284 | for (;;) |
| 285 | { |
| 286 | char *rc; |
| 287 | int save_errno; |
| 288 | |
| 289 | *readptr = 0; /* In case nothing gets read */ |
| 290 | sigalrm_seen = FALSE; |
| 291 | alarm(timeout); |
| 292 | rc = Ufgets(readptr, size-1, f); |
| 293 | save_errno = errno; |
| 294 | alarm(0); |
| 295 | errno = save_errno; |
| 296 | |
| 297 | if (rc != NULL) break; /* A line has been read */ |
| 298 | |
| 299 | /* Handle timeout; must do this first because it uses EINTR */ |
| 300 | |
| 301 | if (sigalrm_seen) errno = ETIMEDOUT; |
| 302 | |
| 303 | /* If some other interrupt arrived, just retry. We presume this to be rare, |
| 304 | but it can happen (e.g. the SIGUSR1 signal sent by exiwhat causes |
| 305 | read() to exit). */ |
| 306 | |
| 307 | else if (errno == EINTR) |
| 308 | { |
| 309 | DEBUG(D_transport) debug_printf("EINTR while reading LMTP response\n"); |
| 310 | continue; |
| 311 | } |
| 312 | |
| 313 | /* Handle other errors, including EOF; ensure buffer is completely empty. */ |
| 314 | |
| 315 | buffer[0] = 0; |
| 316 | return FALSE; |
| 317 | } |
| 318 | |
| 319 | /* Adjust size in case we have to read another line, and adjust the |
| 320 | count to be the length of the line we are about to inspect. */ |
| 321 | |
| 322 | count = Ustrlen(readptr); |
| 323 | size -= count; |
| 324 | count += readptr - ptr; |
| 325 | |
| 326 | /* See if the final two characters in the buffer are \r\n. If not, we |
| 327 | have to read some more. At least, that is what we should do on a strict |
| 328 | interpretation of the RFC. But accept LF as well, as we do for SMTP. */ |
| 329 | |
| 330 | if (ptr[count-1] != '\n') |
| 331 | { |
| 332 | DEBUG(D_transport) |
| 333 | { |
| 334 | int i; |
| 335 | debug_printf("LMTP input line incomplete in one buffer:\n "); |
| 336 | for (i = 0; i < count; i++) |
| 337 | { |
| 338 | int c = (ptr[i]); |
| 339 | if (mac_isprint(c)) debug_printf("%c", c); else debug_printf("<%d>", c); |
| 340 | } |
| 341 | debug_printf("\n"); |
| 342 | } |
| 343 | readptr = ptr + count; |
| 344 | continue; |
| 345 | } |
| 346 | |
| 347 | /* Remove any whitespace at the end of the buffer. This gets rid of CR, LF |
| 348 | etc. at the end. Show it, if debugging, formatting multi-line responses. */ |
| 349 | |
| 350 | while (count > 0 && isspace(ptr[count-1])) count--; |
| 351 | ptr[count] = 0; |
| 352 | |
| 353 | DEBUG(D_transport|D_v) |
| 354 | { |
| 355 | uschar *s = ptr; |
| 356 | uschar *t = ptr; |
| 357 | while (*t != 0) |
| 358 | { |
| 359 | while (*t != 0 && *t != '\n') t++; |
| 360 | debug_printf(" %s %*s\n", (s == ptr)? "LMTP<<" : " ", |
| 361 | (int)(t-s), s); |
| 362 | if (*t == 0) break; |
| 363 | s = t = t + 1; |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | /* Check the format of the response: it must start with three digits; if |
| 368 | these are followed by a space or end of line, the response is complete. If |
| 369 | they are followed by '-' this is a multi-line response and we must look for |
| 370 | another line until the final line is reached. The only use made of multi-line |
| 371 | responses is to pass them back as error messages. We therefore just |
| 372 | concatenate them all within the buffer, which should be large enough to |
| 373 | accept any reasonable number of lines. A multiline response may already |
| 374 | have been read in one go - hence the loop here. */ |
| 375 | |
| 376 | for(;;) |
| 377 | { |
| 378 | uschar *p; |
| 379 | if (count < 3 || |
| 380 | !isdigit(ptr[0]) || |
| 381 | !isdigit(ptr[1]) || |
| 382 | !isdigit(ptr[2]) || |
| 383 | (ptr[3] != '-' && ptr[3] != ' ' && ptr[3] != 0)) |
| 384 | { |
| 385 | errno = ERRNO_SMTPFORMAT; /* format error */ |
| 386 | return FALSE; |
| 387 | } |
| 388 | |
| 389 | /* If a single-line response, exit the loop */ |
| 390 | |
| 391 | if (ptr[3] != '-') break; |
| 392 | |
| 393 | /* For a multi-line response see if the next line is already read, and if |
| 394 | so, stay in this loop to check it. */ |
| 395 | |
| 396 | p = ptr + 3; |
| 397 | while (*(++p) != 0) |
| 398 | { |
| 399 | if (*p == '\n') |
| 400 | { |
| 401 | ptr = ++p; |
| 402 | break; |
| 403 | } |
| 404 | } |
| 405 | if (*p == 0) break; /* No more lines to check */ |
| 406 | } |
| 407 | |
| 408 | /* End of response. If the last of the lines we are looking at is the final |
| 409 | line, we are done. Otherwise more data has to be read. */ |
| 410 | |
| 411 | if (ptr[3] != '-') break; |
| 412 | |
| 413 | /* Move the reading pointer upwards in the buffer and insert \n in case this |
| 414 | is an error message that subsequently gets printed. Set the scanning pointer |
| 415 | to the reading pointer position. */ |
| 416 | |
| 417 | ptr += count; |
| 418 | *ptr++ = '\n'; |
| 419 | size--; |
| 420 | readptr = ptr; |
| 421 | } |
| 422 | |
| 423 | /* Return a value that depends on the LMTP return code. Ensure that errno is |
| 424 | zero, because the caller of this function looks at errno when FALSE is |
| 425 | returned, to distinguish between an unexpected return code and other errors |
| 426 | such as timeouts, lost connections, etc. */ |
| 427 | |
| 428 | errno = 0; |
| 429 | return buffer[0] == okdigit; |
| 430 | } |
| 431 | |
| 432 | |
| 433 | |
| 434 | |
| 435 | |
| 436 | |
| 437 | /************************************************* |
| 438 | * Main entry point * |
| 439 | *************************************************/ |
| 440 | |
| 441 | /* See local README for interface details. For setup-errors, this transport |
| 442 | returns FALSE, indicating that the first address has the status for all; in |
| 443 | normal cases it returns TRUE, indicating that each address has its own status |
| 444 | set. */ |
| 445 | |
| 446 | BOOL |
| 447 | lmtp_transport_entry( |
| 448 | transport_instance *tblock, /* data for this instantiation */ |
| 449 | address_item *addrlist) /* address(es) we are working on */ |
| 450 | { |
| 451 | pid_t pid = 0; |
| 452 | FILE *out; |
| 453 | lmtp_transport_options_block *ob = |
| 454 | (lmtp_transport_options_block *)(tblock->options_block); |
| 455 | struct sockaddr_un sockun; /* don't call this "sun" ! */ |
| 456 | int timeout = ob->timeout; |
| 457 | int fd_in = -1, fd_out = -1; |
| 458 | int code, save_errno; |
| 459 | BOOL send_data; |
| 460 | BOOL yield = FALSE; |
| 461 | address_item *addr; |
| 462 | uschar *igquotstr = US""; |
| 463 | uschar *sockname = NULL; |
| 464 | const uschar **argv; |
| 465 | uschar buffer[256]; |
| 466 | |
| 467 | DEBUG(D_transport) debug_printf("%s transport entered\n", tblock->name); |
| 468 | |
| 469 | /* Initialization ensures that either a command or a socket is specified, but |
| 470 | not both. When a command is specified, call the common function for creating an |
| 471 | argument list and expanding the items. */ |
| 472 | |
| 473 | if (ob->cmd) |
| 474 | { |
| 475 | DEBUG(D_transport) debug_printf("using command %s\n", ob->cmd); |
| 476 | sprintf(CS buffer, "%.50s transport", tblock->name); |
| 477 | if (!transport_set_up_command(&argv, ob->cmd, TRUE, PANIC, addrlist, buffer, |
| 478 | NULL)) |
| 479 | return FALSE; |
| 480 | |
| 481 | /* If the -N option is set, can't do any more. Presume all has gone well. */ |
| 482 | if (dont_deliver) |
| 483 | goto MINUS_N; |
| 484 | |
| 485 | /* As this is a local transport, we are already running with the required |
| 486 | uid/gid and current directory. Request that the new process be a process group |
| 487 | leader, so we can kill it and all its children on an error. */ |
| 488 | |
| 489 | if ((pid = child_open(USS argv, NULL, 0, &fd_in, &fd_out, TRUE)) < 0) |
| 490 | { |
| 491 | addrlist->message = string_sprintf( |
| 492 | "Failed to create child process for %s transport: %s", tblock->name, |
| 493 | strerror(errno)); |
| 494 | return FALSE; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | /* When a socket is specified, expand the string and create a socket. */ |
| 499 | |
| 500 | else |
| 501 | { |
| 502 | DEBUG(D_transport) debug_printf("using socket %s\n", ob->skt); |
| 503 | sockname = expand_string(ob->skt); |
| 504 | if (sockname == NULL) |
| 505 | { |
| 506 | addrlist->message = string_sprintf("Expansion of \"%s\" (socket setting " |
| 507 | "for %s transport) failed: %s", ob->skt, tblock->name, |
| 508 | expand_string_message); |
| 509 | return FALSE; |
| 510 | } |
| 511 | if ((fd_in = fd_out = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) |
| 512 | { |
| 513 | addrlist->message = string_sprintf( |
| 514 | "Failed to create socket %s for %s transport: %s", |
| 515 | ob->skt, tblock->name, strerror(errno)); |
| 516 | return FALSE; |
| 517 | } |
| 518 | |
| 519 | /* If the -N option is set, can't do any more. Presume all has gone well. */ |
| 520 | if (dont_deliver) |
| 521 | goto MINUS_N; |
| 522 | |
| 523 | sockun.sun_family = AF_UNIX; |
| 524 | sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1), sockname); |
| 525 | if(connect(fd_out, (struct sockaddr *)(&sockun), sizeof(sockun)) == -1) |
| 526 | { |
| 527 | addrlist->message = string_sprintf( |
| 528 | "Failed to connect to socket %s for %s transport: %s", |
| 529 | sockun.sun_path, tblock->name, strerror(errno)); |
| 530 | return FALSE; |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | |
| 535 | /* Make the output we are going to read into a file. */ |
| 536 | |
| 537 | out = fdopen(fd_out, "rb"); |
| 538 | |
| 539 | /* Now we must implement the LMTP protocol. It is like SMTP, except that after |
| 540 | the end of the message, a return code for every accepted RCPT TO is sent. This |
| 541 | allows for message+recipient checks after the message has been received. */ |
| 542 | |
| 543 | /* First thing is to wait for an initial greeting. */ |
| 544 | |
| 545 | Ustrcpy(big_buffer, "initial connection"); |
| 546 | if (!lmtp_read_response(out, buffer, sizeof(buffer), '2', |
| 547 | timeout)) goto RESPONSE_FAILED; |
| 548 | |
| 549 | /* Next, we send a LHLO command, and expect a positive response */ |
| 550 | |
| 551 | if (!lmtp_write_command(fd_in, "%s %s\r\n", "LHLO", |
| 552 | primary_hostname)) goto WRITE_FAILED; |
| 553 | |
| 554 | if (!lmtp_read_response(out, buffer, sizeof(buffer), '2', |
| 555 | timeout)) goto RESPONSE_FAILED; |
| 556 | |
| 557 | /* If the ignore_quota option is set, note whether the server supports the |
| 558 | IGNOREQUOTA option, and if so, set an appropriate addition for RCPT. */ |
| 559 | |
| 560 | if (ob->ignore_quota) |
| 561 | igquotstr = (pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, |
| 562 | Ustrlen(CS buffer), 0, PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; |
| 563 | |
| 564 | /* Now the envelope sender */ |
| 565 | |
| 566 | if (!lmtp_write_command(fd_in, "MAIL FROM:<%s>\r\n", return_path)) |
| 567 | goto WRITE_FAILED; |
| 568 | |
| 569 | if (!lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout)) |
| 570 | { |
| 571 | if (errno == 0 && buffer[0] == '4') |
| 572 | { |
| 573 | errno = ERRNO_MAIL4XX; |
| 574 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 575 | } |
| 576 | goto RESPONSE_FAILED; |
| 577 | } |
| 578 | |
| 579 | /* Next, we hand over all the recipients. Some may be permanently or |
| 580 | temporarily rejected; others may be accepted, for now. */ |
| 581 | |
| 582 | send_data = FALSE; |
| 583 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 584 | { |
| 585 | if (!lmtp_write_command(fd_in, "RCPT TO:<%s>%s\r\n", |
| 586 | transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr)) |
| 587 | goto WRITE_FAILED; |
| 588 | if (lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout)) |
| 589 | { |
| 590 | send_data = TRUE; |
| 591 | addr->transport_return = PENDING_OK; |
| 592 | } |
| 593 | else |
| 594 | { |
| 595 | if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED; |
| 596 | addr->message = string_sprintf("LMTP error after %s: %s", big_buffer, |
| 597 | string_printing(buffer)); |
| 598 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
| 599 | if (buffer[0] == '5') addr->transport_return = FAIL; else |
| 600 | { |
| 601 | addr->basic_errno = ERRNO_RCPT4XX; |
| 602 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 603 | } |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | /* Now send the text of the message if there were any good recipients. */ |
| 608 | |
| 609 | if (send_data) |
| 610 | { |
| 611 | BOOL ok; |
| 612 | transport_ctx tctx = { |
| 613 | tblock, |
| 614 | addrlist, |
| 615 | US".", US"..", |
| 616 | ob->options |
| 617 | }; |
| 618 | |
| 619 | if (!lmtp_write_command(fd_in, "DATA\r\n")) goto WRITE_FAILED; |
| 620 | if (!lmtp_read_response(out, buffer, sizeof(buffer), '3', timeout)) |
| 621 | { |
| 622 | if (errno == 0 && buffer[0] == '4') |
| 623 | { |
| 624 | errno = ERRNO_DATA4XX; |
| 625 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 626 | } |
| 627 | goto RESPONSE_FAILED; |
| 628 | } |
| 629 | |
| 630 | sigalrm_seen = FALSE; |
| 631 | transport_write_timeout = timeout; |
| 632 | Ustrcpy(big_buffer, "sending data block"); /* For error messages */ |
| 633 | DEBUG(D_transport|D_v) |
| 634 | debug_printf(" LMTP>> writing message and terminating \".\"\n"); |
| 635 | |
| 636 | transport_count = 0; |
| 637 | ok = transport_write_message(fd_in, &tctx, 0); |
| 638 | |
| 639 | /* Failure can either be some kind of I/O disaster (including timeout), |
| 640 | or the failure of a transport filter or the expansion of added headers. */ |
| 641 | |
| 642 | if (!ok) |
| 643 | { |
| 644 | buffer[0] = 0; /* There hasn't been a response */ |
| 645 | goto RESPONSE_FAILED; |
| 646 | } |
| 647 | |
| 648 | Ustrcpy(big_buffer, "end of data"); /* For error messages */ |
| 649 | |
| 650 | /* We now expect a response for every address that was accepted above, |
| 651 | in the same order. For those that get a response, their status is fixed; |
| 652 | any that are accepted have been handed over, even if later responses crash - |
| 653 | at least, that's how I read RFC 2033. */ |
| 654 | |
| 655 | for (addr = addrlist; addr != NULL; addr = addr->next) |
| 656 | { |
| 657 | if (addr->transport_return != PENDING_OK) continue; |
| 658 | |
| 659 | if (lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout)) |
| 660 | { |
| 661 | addr->transport_return = OK; |
| 662 | if (LOGGING(smtp_confirmation)) |
| 663 | { |
| 664 | const uschar *s = string_printing(buffer); |
| 665 | /* de-const safe here as string_printing known to have alloc'n'copied */ |
| 666 | addr->message = (s == buffer)? (uschar *)string_copy(s) : US s; |
| 667 | } |
| 668 | } |
| 669 | /* If the response has failed badly, use it for all the remaining pending |
| 670 | addresses and give up. */ |
| 671 | |
| 672 | else if (errno != 0 || buffer[0] == 0) |
| 673 | { |
| 674 | address_item *a; |
| 675 | save_errno = errno; |
| 676 | check_response(&save_errno, addr->more_errno, buffer, &code, |
| 677 | &(addr->message)); |
| 678 | addr->transport_return = (code == '5')? FAIL : DEFER; |
| 679 | for (a = addr->next; a != NULL; a = a->next) |
| 680 | { |
| 681 | if (a->transport_return != PENDING_OK) continue; |
| 682 | a->basic_errno = addr->basic_errno; |
| 683 | a->message = addr->message; |
| 684 | a->transport_return = addr->transport_return; |
| 685 | } |
| 686 | break; |
| 687 | } |
| 688 | |
| 689 | /* Otherwise, it's an LMTP error code return for one address */ |
| 690 | |
| 691 | else |
| 692 | { |
| 693 | if (buffer[0] == '4') |
| 694 | { |
| 695 | addr->basic_errno = ERRNO_DATA4XX; |
| 696 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
| 697 | } |
| 698 | addr->message = string_sprintf("LMTP error after %s: %s", big_buffer, |
| 699 | string_printing(buffer)); |
| 700 | addr->transport_return = (buffer[0] == '5')? FAIL : DEFER; |
| 701 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
| 702 | } |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | /* The message transaction has completed successfully - this doesn't mean that |
| 707 | all the addresses have necessarily been transferred, but each has its status |
| 708 | set, so we change the yield to TRUE. */ |
| 709 | |
| 710 | yield = TRUE; |
| 711 | (void) lmtp_write_command(fd_in, "QUIT\r\n"); |
| 712 | (void) lmtp_read_response(out, buffer, sizeof(buffer), '2', 1); |
| 713 | |
| 714 | goto RETURN; |
| 715 | |
| 716 | |
| 717 | /* Come here if any call to read_response, other than a response after the data |
| 718 | phase, failed. Put the error in the top address - this will be replicated |
| 719 | because the yield is still FALSE. (But omit ETIMEDOUT, as there will already be |
| 720 | a suitable message.) Analyse the error, and if if isn't too bad, send a QUIT |
| 721 | command. Wait for the response with a short timeout, so we don't wind up this |
| 722 | process before the far end has had time to read the QUIT. */ |
| 723 | |
| 724 | RESPONSE_FAILED: |
| 725 | |
| 726 | save_errno = errno; |
| 727 | if (errno != ETIMEDOUT && errno != 0) addrlist->basic_errno = errno; |
| 728 | addrlist->message = NULL; |
| 729 | |
| 730 | if (check_response(&save_errno, addrlist->more_errno, |
| 731 | buffer, &code, &(addrlist->message))) |
| 732 | { |
| 733 | (void) lmtp_write_command(fd_in, "QUIT\r\n"); |
| 734 | (void) lmtp_read_response(out, buffer, sizeof(buffer), '2', 1); |
| 735 | } |
| 736 | |
| 737 | addrlist->transport_return = (code == '5')? FAIL : DEFER; |
| 738 | if (code == '4' && save_errno > 0) |
| 739 | addrlist->message = string_sprintf("%s: %s", addrlist->message, |
| 740 | strerror(save_errno)); |
| 741 | goto KILL_AND_RETURN; |
| 742 | |
| 743 | /* Come here if there are errors during writing of a command or the message |
| 744 | itself. This error will be applied to all the addresses. */ |
| 745 | |
| 746 | WRITE_FAILED: |
| 747 | |
| 748 | addrlist->transport_return = PANIC; |
| 749 | addrlist->basic_errno = errno; |
| 750 | if (errno == ERRNO_CHHEADER_FAIL) |
| 751 | addrlist->message = |
| 752 | string_sprintf("Failed to expand headers_add or headers_remove: %s", |
| 753 | expand_string_message); |
| 754 | else if (errno == ERRNO_FILTER_FAIL) |
| 755 | addrlist->message = string_sprintf("Filter process failure"); |
| 756 | else if (errno == ERRNO_WRITEINCOMPLETE) |
| 757 | addrlist->message = string_sprintf("Failed repeatedly to write data"); |
| 758 | else if (errno == ERRNO_SMTPFORMAT) |
| 759 | addrlist->message = US"overlong LMTP command generated"; |
| 760 | else |
| 761 | addrlist->message = string_sprintf("Error %d", errno); |
| 762 | |
| 763 | /* Come here after errors. Kill off the process. */ |
| 764 | |
| 765 | KILL_AND_RETURN: |
| 766 | |
| 767 | if (pid > 0) killpg(pid, SIGKILL); |
| 768 | |
| 769 | /* Come here from all paths after the subprocess is created. Wait for the |
| 770 | process, but with a timeout. */ |
| 771 | |
| 772 | RETURN: |
| 773 | |
| 774 | (void)child_close(pid, timeout); |
| 775 | |
| 776 | if (fd_in >= 0) (void)close(fd_in); |
| 777 | if (fd_out >= 0) (void)fclose(out); |
| 778 | |
| 779 | DEBUG(D_transport) |
| 780 | debug_printf("%s transport yields %d\n", tblock->name, yield); |
| 781 | |
| 782 | return yield; |
| 783 | |
| 784 | |
| 785 | MINUS_N: |
| 786 | DEBUG(D_transport) |
| 787 | debug_printf("*** delivery by %s transport bypassed by -N option", |
| 788 | tblock->name); |
| 789 | addrlist->transport_return = OK; |
| 790 | return FALSE; |
| 791 | } |
| 792 | |
| 793 | /* End of transport/lmtp.c */ |