tidying
[exim.git] / src / src / transports / lmtp.c
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
44 #ifdef MACRO_PREDEF
45
46 /* Dummy values */
47 lmtp_transport_options_block lmtp_transport_option_defaults = {0};
48 void lmtp_transport_init(transport_instance *tblock) {}
49 BOOL lmtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
50
51 #else /*!MACRO_PREDEF*/
52
53
54 /* Default private options block for the lmtp transport. */
55
56 lmtp_transport_options_block lmtp_transport_option_defaults = {
57 NULL, /* cmd */
58 NULL, /* skt */
59 5*60, /* timeout */
60 0, /* options */
61 FALSE /* ignore_quota */
62 };
63
64
65
66 /*************************************************
67 * Initialization entry point *
68 *************************************************/
69
70 /* Called for each instance, after its options have been read, to
71 enable consistency checks to be done, or anything else that needs
72 to be set up. */
73
74 void
75 lmtp_transport_init(transport_instance *tblock)
76 {
77 lmtp_transport_options_block *ob =
78 (lmtp_transport_options_block *)(tblock->options_block);
79
80 /* Either the command field or the socket field must be set */
81
82 if ((ob->cmd == NULL) == (ob->skt == NULL))
83 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
84 "one (and only one) of command or socket must be set for the %s transport",
85 tblock->name);
86
87 /* If a fixed uid field is set, then a gid field must also be set. */
88
89 if (tblock->uid_set && !tblock->gid_set && tblock->expand_gid == NULL)
90 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
91 "user set without group for the %s transport", tblock->name);
92
93 /* Set up the bitwise options for transport_write_message from the various
94 driver options. Only one of body_only and headers_only can be set. */
95
96 ob->options |=
97 (tblock->body_only? topt_no_headers : 0) |
98 (tblock->headers_only? topt_no_body : 0) |
99 (tblock->return_path_add? topt_add_return_path : 0) |
100 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
101 (tblock->envelope_to_add? topt_add_envelope_to : 0) |
102 topt_use_crlf | topt_end_dot;
103 }
104
105
106 /*************************************************
107 * Check an LMTP response *
108 *************************************************/
109
110 /* This function is given an errno code and the LMTP response buffer to
111 analyse. It sets an appropriate message and puts the first digit of the
112 response code into the yield variable. If no response was actually read, a
113 suitable digit is chosen.
114
115 Arguments:
116 errno_value pointer to the errno value
117 more_errno from the top address for use with ERRNO_FILTER_FAIL
118 buffer the LMTP response buffer
119 yield where to put a one-digit LMTP response code
120 message where to put an error message
121
122 Returns: TRUE if a "QUIT" command should be sent, else FALSE
123 */
124
125 static BOOL check_response(int *errno_value, int more_errno, uschar *buffer,
126 int *yield, uschar **message)
127 {
128 *yield = '4'; /* Default setting is to give a temporary error */
129
130 /* Handle response timeout */
131
132 if (*errno_value == ETIMEDOUT)
133 {
134 *message = string_sprintf("LMTP timeout after %s", big_buffer);
135 if (transport_count > 0)
136 *message = string_sprintf("%s (%d bytes written)", *message,
137 transport_count);
138 *errno_value = 0;
139 return FALSE;
140 }
141
142 /* Handle malformed LMTP response */
143
144 if (*errno_value == ERRNO_SMTPFORMAT)
145 {
146 *message = string_sprintf("Malformed LMTP response after %s: %s",
147 big_buffer, string_printing(buffer));
148 return FALSE;
149 }
150
151 /* Handle a failed filter process error; can't send QUIT as we mustn't
152 end the DATA. */
153
154 if (*errno_value == ERRNO_FILTER_FAIL)
155 {
156 *message = string_sprintf("transport filter process failed (%d)%s",
157 more_errno,
158 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
159 return FALSE;
160 }
161
162 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
163 end the DATA. */
164
165 if (*errno_value == ERRNO_CHHEADER_FAIL)
166 {
167 *message =
168 string_sprintf("failed to expand headers_add or headers_remove: %s",
169 expand_string_message);
170 return FALSE;
171 }
172
173 /* Handle failure to write a complete data block */
174
175 if (*errno_value == ERRNO_WRITEINCOMPLETE)
176 {
177 *message = string_sprintf("failed to write a data block");
178 return FALSE;
179 }
180
181 /* Handle error responses from the remote process. */
182
183 if (buffer[0] != 0)
184 {
185 const uschar *s = string_printing(buffer);
186 *message = string_sprintf("LMTP error after %s: %s", big_buffer, s);
187 *yield = buffer[0];
188 return TRUE;
189 }
190
191 /* No data was read. If there is no errno, this must be the EOF (i.e.
192 connection closed) case, which causes deferral. Otherwise, leave the errno
193 value to be interpreted. In all cases, we have to assume the connection is now
194 dead. */
195
196 if (*errno_value == 0)
197 {
198 *errno_value = ERRNO_SMTPCLOSED;
199 *message = string_sprintf("LMTP connection closed after %s", big_buffer);
200 }
201
202 return FALSE;
203 }
204
205
206
207 /*************************************************
208 * Write LMTP command *
209 *************************************************/
210
211 /* The formatted command is left in big_buffer so that it can be reflected in
212 any error message.
213
214 Arguments:
215 fd the fd to write to
216 format a format, starting with one of
217 of HELO, MAIL FROM, RCPT TO, DATA, ".", or QUIT.
218 ... data for the format
219
220 Returns: TRUE if successful, FALSE if not, with errno set
221 */
222
223 static BOOL
224 lmtp_write_command(int fd, const char *format, ...)
225 {
226 int count, rc;
227 va_list ap;
228 va_start(ap, format);
229 if (!string_vformat(big_buffer, big_buffer_size, CS format, ap))
230 {
231 va_end(ap);
232 errno = ERRNO_SMTPFORMAT;
233 return FALSE;
234 }
235 va_end(ap);
236 count = Ustrlen(big_buffer);
237 DEBUG(D_transport|D_v) debug_printf(" LMTP>> %s", big_buffer);
238 rc = write(fd, big_buffer, count);
239 big_buffer[count-2] = 0; /* remove \r\n for debug and error message */
240 if (rc > 0) return TRUE;
241 DEBUG(D_transport) debug_printf("write failed: %s\n", strerror(errno));
242 return FALSE;
243 }
244
245
246
247
248 /*************************************************
249 * Read LMTP response *
250 *************************************************/
251
252 /* This function reads an LMTP response with a timeout, and returns the
253 response in the given buffer. It also analyzes the first digit of the reply
254 code and returns FALSE if it is not acceptable.
255
256 FALSE is also returned after a reading error. In this case buffer[0] will be
257 zero, and the error code will be in errno.
258
259 Arguments:
260 f a file to read from
261 buffer where to put the response
262 size the size of the buffer
263 okdigit the expected first digit of the response
264 timeout the timeout to use
265
266 Returns: TRUE if a valid, non-error response was received; else FALSE
267 */
268
269 static BOOL
270 lmtp_read_response(FILE *f, uschar *buffer, int size, int okdigit, int timeout)
271 {
272 int count;
273 uschar *ptr = buffer;
274 uschar *readptr = buffer;
275
276 /* Ensure errno starts out zero */
277
278 errno = 0;
279
280 /* Loop for handling LMTP responses that do not all come in one line. */
281
282 for (;;)
283 {
284 /* If buffer is too full, something has gone wrong. */
285
286 if (size < 10)
287 {
288 *readptr = 0;
289 errno = ERRNO_SMTPFORMAT;
290 return FALSE;
291 }
292
293 /* Loop to cover the read getting interrupted. */
294
295 for (;;)
296 {
297 char *rc;
298 int save_errno;
299
300 *readptr = 0; /* In case nothing gets read */
301 sigalrm_seen = FALSE;
302 alarm(timeout);
303 rc = Ufgets(readptr, size-1, f);
304 save_errno = errno;
305 alarm(0);
306 errno = save_errno;
307
308 if (rc != NULL) break; /* A line has been read */
309
310 /* Handle timeout; must do this first because it uses EINTR */
311
312 if (sigalrm_seen) errno = ETIMEDOUT;
313
314 /* If some other interrupt arrived, just retry. We presume this to be rare,
315 but it can happen (e.g. the SIGUSR1 signal sent by exiwhat causes
316 read() to exit). */
317
318 else if (errno == EINTR)
319 {
320 DEBUG(D_transport) debug_printf("EINTR while reading LMTP response\n");
321 continue;
322 }
323
324 /* Handle other errors, including EOF; ensure buffer is completely empty. */
325
326 buffer[0] = 0;
327 return FALSE;
328 }
329
330 /* Adjust size in case we have to read another line, and adjust the
331 count to be the length of the line we are about to inspect. */
332
333 count = Ustrlen(readptr);
334 size -= count;
335 count += readptr - ptr;
336
337 /* See if the final two characters in the buffer are \r\n. If not, we
338 have to read some more. At least, that is what we should do on a strict
339 interpretation of the RFC. But accept LF as well, as we do for SMTP. */
340
341 if (ptr[count-1] != '\n')
342 {
343 DEBUG(D_transport)
344 {
345 int i;
346 debug_printf("LMTP input line incomplete in one buffer:\n ");
347 for (i = 0; i < count; i++)
348 {
349 int c = (ptr[i]);
350 if (mac_isprint(c)) debug_printf("%c", c); else debug_printf("<%d>", c);
351 }
352 debug_printf("\n");
353 }
354 readptr = ptr + count;
355 continue;
356 }
357
358 /* Remove any whitespace at the end of the buffer. This gets rid of CR, LF
359 etc. at the end. Show it, if debugging, formatting multi-line responses. */
360
361 while (count > 0 && isspace(ptr[count-1])) count--;
362 ptr[count] = 0;
363
364 DEBUG(D_transport|D_v)
365 {
366 uschar *s = ptr;
367 uschar *t = ptr;
368 while (*t != 0)
369 {
370 while (*t != 0 && *t != '\n') t++;
371 debug_printf(" %s %*s\n", (s == ptr)? "LMTP<<" : " ",
372 (int)(t-s), s);
373 if (*t == 0) break;
374 s = t = t + 1;
375 }
376 }
377
378 /* Check the format of the response: it must start with three digits; if
379 these are followed by a space or end of line, the response is complete. If
380 they are followed by '-' this is a multi-line response and we must look for
381 another line until the final line is reached. The only use made of multi-line
382 responses is to pass them back as error messages. We therefore just
383 concatenate them all within the buffer, which should be large enough to
384 accept any reasonable number of lines. A multiline response may already
385 have been read in one go - hence the loop here. */
386
387 for(;;)
388 {
389 uschar *p;
390 if (count < 3 ||
391 !isdigit(ptr[0]) ||
392 !isdigit(ptr[1]) ||
393 !isdigit(ptr[2]) ||
394 (ptr[3] != '-' && ptr[3] != ' ' && ptr[3] != 0))
395 {
396 errno = ERRNO_SMTPFORMAT; /* format error */
397 return FALSE;
398 }
399
400 /* If a single-line response, exit the loop */
401
402 if (ptr[3] != '-') break;
403
404 /* For a multi-line response see if the next line is already read, and if
405 so, stay in this loop to check it. */
406
407 p = ptr + 3;
408 while (*(++p) != 0)
409 {
410 if (*p == '\n')
411 {
412 ptr = ++p;
413 break;
414 }
415 }
416 if (*p == 0) break; /* No more lines to check */
417 }
418
419 /* End of response. If the last of the lines we are looking at is the final
420 line, we are done. Otherwise more data has to be read. */
421
422 if (ptr[3] != '-') break;
423
424 /* Move the reading pointer upwards in the buffer and insert \n in case this
425 is an error message that subsequently gets printed. Set the scanning pointer
426 to the reading pointer position. */
427
428 ptr += count;
429 *ptr++ = '\n';
430 size--;
431 readptr = ptr;
432 }
433
434 /* Return a value that depends on the LMTP return code. Ensure that errno is
435 zero, because the caller of this function looks at errno when FALSE is
436 returned, to distinguish between an unexpected return code and other errors
437 such as timeouts, lost connections, etc. */
438
439 errno = 0;
440 return buffer[0] == okdigit;
441 }
442
443
444
445
446
447
448 /*************************************************
449 * Main entry point *
450 *************************************************/
451
452 /* See local README for interface details. For setup-errors, this transport
453 returns FALSE, indicating that the first address has the status for all; in
454 normal cases it returns TRUE, indicating that each address has its own status
455 set. */
456
457 BOOL
458 lmtp_transport_entry(
459 transport_instance *tblock, /* data for this instantiation */
460 address_item *addrlist) /* address(es) we are working on */
461 {
462 pid_t pid = 0;
463 FILE *out;
464 lmtp_transport_options_block *ob =
465 (lmtp_transport_options_block *)(tblock->options_block);
466 struct sockaddr_un sockun; /* don't call this "sun" ! */
467 int timeout = ob->timeout;
468 int fd_in = -1, fd_out = -1;
469 int code, save_errno;
470 BOOL send_data;
471 BOOL yield = FALSE;
472 address_item *addr;
473 uschar *igquotstr = US"";
474 uschar *sockname = NULL;
475 const uschar **argv;
476 uschar buffer[256];
477
478 DEBUG(D_transport) debug_printf("%s transport entered\n", tblock->name);
479
480 /* Initialization ensures that either a command or a socket is specified, but
481 not both. When a command is specified, call the common function for creating an
482 argument list and expanding the items. */
483
484 if (ob->cmd)
485 {
486 DEBUG(D_transport) debug_printf("using command %s\n", ob->cmd);
487 sprintf(CS buffer, "%.50s transport", tblock->name);
488 if (!transport_set_up_command(&argv, ob->cmd, TRUE, PANIC, addrlist, buffer,
489 NULL))
490 return FALSE;
491
492 /* If the -N option is set, can't do any more. Presume all has gone well. */
493 if (dont_deliver)
494 goto MINUS_N;
495
496 /* As this is a local transport, we are already running with the required
497 uid/gid and current directory. Request that the new process be a process group
498 leader, so we can kill it and all its children on an error. */
499
500 if ((pid = child_open(USS argv, NULL, 0, &fd_in, &fd_out, TRUE)) < 0)
501 {
502 addrlist->message = string_sprintf(
503 "Failed to create child process for %s transport: %s", tblock->name,
504 strerror(errno));
505 return FALSE;
506 }
507 }
508
509 /* When a socket is specified, expand the string and create a socket. */
510
511 else
512 {
513 DEBUG(D_transport) debug_printf("using socket %s\n", ob->skt);
514 sockname = expand_string(ob->skt);
515 if (sockname == NULL)
516 {
517 addrlist->message = string_sprintf("Expansion of \"%s\" (socket setting "
518 "for %s transport) failed: %s", ob->skt, tblock->name,
519 expand_string_message);
520 return FALSE;
521 }
522 if ((fd_in = fd_out = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
523 {
524 addrlist->message = string_sprintf(
525 "Failed to create socket %s for %s transport: %s",
526 ob->skt, tblock->name, strerror(errno));
527 return FALSE;
528 }
529
530 /* If the -N option is set, can't do any more. Presume all has gone well. */
531 if (dont_deliver)
532 goto MINUS_N;
533
534 sockun.sun_family = AF_UNIX;
535 sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1), sockname);
536 if(connect(fd_out, (struct sockaddr *)(&sockun), sizeof(sockun)) == -1)
537 {
538 addrlist->message = string_sprintf(
539 "Failed to connect to socket %s for %s transport: %s",
540 sockun.sun_path, tblock->name, strerror(errno));
541 return FALSE;
542 }
543 }
544
545
546 /* Make the output we are going to read into a file. */
547
548 out = fdopen(fd_out, "rb");
549
550 /* Now we must implement the LMTP protocol. It is like SMTP, except that after
551 the end of the message, a return code for every accepted RCPT TO is sent. This
552 allows for message+recipient checks after the message has been received. */
553
554 /* First thing is to wait for an initial greeting. */
555
556 Ustrcpy(big_buffer, "initial connection");
557 if (!lmtp_read_response(out, buffer, sizeof(buffer), '2',
558 timeout)) goto RESPONSE_FAILED;
559
560 /* Next, we send a LHLO command, and expect a positive response */
561
562 if (!lmtp_write_command(fd_in, "%s %s\r\n", "LHLO",
563 primary_hostname)) goto WRITE_FAILED;
564
565 if (!lmtp_read_response(out, buffer, sizeof(buffer), '2',
566 timeout)) goto RESPONSE_FAILED;
567
568 /* If the ignore_quota option is set, note whether the server supports the
569 IGNOREQUOTA option, and if so, set an appropriate addition for RCPT. */
570
571 if (ob->ignore_quota)
572 igquotstr = (pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer,
573 Ustrlen(CS buffer), 0, PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
574
575 /* Now the envelope sender */
576
577 if (!lmtp_write_command(fd_in, "MAIL FROM:<%s>\r\n", return_path))
578 goto WRITE_FAILED;
579
580 if (!lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout))
581 {
582 if (errno == 0 && buffer[0] == '4')
583 {
584 errno = ERRNO_MAIL4XX;
585 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
586 }
587 goto RESPONSE_FAILED;
588 }
589
590 /* Next, we hand over all the recipients. Some may be permanently or
591 temporarily rejected; others may be accepted, for now. */
592
593 send_data = FALSE;
594 for (addr = addrlist; addr != NULL; addr = addr->next)
595 {
596 if (!lmtp_write_command(fd_in, "RCPT TO:<%s>%s\r\n",
597 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr))
598 goto WRITE_FAILED;
599 if (lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout))
600 {
601 send_data = TRUE;
602 addr->transport_return = PENDING_OK;
603 }
604 else
605 {
606 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
607 addr->message = string_sprintf("LMTP error after %s: %s", big_buffer,
608 string_printing(buffer));
609 setflag(addr, af_pass_message); /* Allow message to go to user */
610 if (buffer[0] == '5') addr->transport_return = FAIL; else
611 {
612 addr->basic_errno = ERRNO_RCPT4XX;
613 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
614 }
615 }
616 }
617
618 /* Now send the text of the message if there were any good recipients. */
619
620 if (send_data)
621 {
622 BOOL ok;
623 transport_ctx tctx = {
624 {fd_in},
625 tblock,
626 addrlist,
627 US".", US"..",
628 ob->options
629 };
630
631 if (!lmtp_write_command(fd_in, "DATA\r\n")) goto WRITE_FAILED;
632 if (!lmtp_read_response(out, buffer, sizeof(buffer), '3', timeout))
633 {
634 if (errno == 0 && buffer[0] == '4')
635 {
636 errno = ERRNO_DATA4XX;
637 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
638 }
639 goto RESPONSE_FAILED;
640 }
641
642 sigalrm_seen = FALSE;
643 transport_write_timeout = timeout;
644 Ustrcpy(big_buffer, "sending data block"); /* For error messages */
645 DEBUG(D_transport|D_v)
646 debug_printf(" LMTP>> writing message and terminating \".\"\n");
647
648 transport_count = 0;
649 ok = transport_write_message(&tctx, 0);
650
651 /* Failure can either be some kind of I/O disaster (including timeout),
652 or the failure of a transport filter or the expansion of added headers. */
653
654 if (!ok)
655 {
656 buffer[0] = 0; /* There hasn't been a response */
657 goto RESPONSE_FAILED;
658 }
659
660 Ustrcpy(big_buffer, "end of data"); /* For error messages */
661
662 /* We now expect a response for every address that was accepted above,
663 in the same order. For those that get a response, their status is fixed;
664 any that are accepted have been handed over, even if later responses crash -
665 at least, that's how I read RFC 2033. */
666
667 for (addr = addrlist; addr != NULL; addr = addr->next)
668 {
669 if (addr->transport_return != PENDING_OK) continue;
670
671 if (lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout))
672 {
673 addr->transport_return = OK;
674 if (LOGGING(smtp_confirmation))
675 {
676 const uschar *s = string_printing(buffer);
677 /* de-const safe here as string_printing known to have alloc'n'copied */
678 addr->message = (s == buffer)? (uschar *)string_copy(s) : US s;
679 }
680 }
681 /* If the response has failed badly, use it for all the remaining pending
682 addresses and give up. */
683
684 else if (errno != 0 || buffer[0] == 0)
685 {
686 address_item *a;
687 save_errno = errno;
688 check_response(&save_errno, addr->more_errno, buffer, &code,
689 &(addr->message));
690 addr->transport_return = (code == '5')? FAIL : DEFER;
691 for (a = addr->next; a != NULL; a = a->next)
692 {
693 if (a->transport_return != PENDING_OK) continue;
694 a->basic_errno = addr->basic_errno;
695 a->message = addr->message;
696 a->transport_return = addr->transport_return;
697 }
698 break;
699 }
700
701 /* Otherwise, it's an LMTP error code return for one address */
702
703 else
704 {
705 if (buffer[0] == '4')
706 {
707 addr->basic_errno = ERRNO_DATA4XX;
708 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
709 }
710 addr->message = string_sprintf("LMTP error after %s: %s", big_buffer,
711 string_printing(buffer));
712 addr->transport_return = (buffer[0] == '5')? FAIL : DEFER;
713 setflag(addr, af_pass_message); /* Allow message to go to user */
714 }
715 }
716 }
717
718 /* The message transaction has completed successfully - this doesn't mean that
719 all the addresses have necessarily been transferred, but each has its status
720 set, so we change the yield to TRUE. */
721
722 yield = TRUE;
723 (void) lmtp_write_command(fd_in, "QUIT\r\n");
724 (void) lmtp_read_response(out, buffer, sizeof(buffer), '2', 1);
725
726 goto RETURN;
727
728
729 /* Come here if any call to read_response, other than a response after the data
730 phase, failed. Put the error in the top address - this will be replicated
731 because the yield is still FALSE. (But omit ETIMEDOUT, as there will already be
732 a suitable message.) Analyse the error, and if if isn't too bad, send a QUIT
733 command. Wait for the response with a short timeout, so we don't wind up this
734 process before the far end has had time to read the QUIT. */
735
736 RESPONSE_FAILED:
737
738 save_errno = errno;
739 if (errno != ETIMEDOUT && errno != 0) addrlist->basic_errno = errno;
740 addrlist->message = NULL;
741
742 if (check_response(&save_errno, addrlist->more_errno,
743 buffer, &code, &(addrlist->message)))
744 {
745 (void) lmtp_write_command(fd_in, "QUIT\r\n");
746 (void) lmtp_read_response(out, buffer, sizeof(buffer), '2', 1);
747 }
748
749 addrlist->transport_return = (code == '5')? FAIL : DEFER;
750 if (code == '4' && save_errno > 0)
751 addrlist->message = string_sprintf("%s: %s", addrlist->message,
752 strerror(save_errno));
753 goto KILL_AND_RETURN;
754
755 /* Come here if there are errors during writing of a command or the message
756 itself. This error will be applied to all the addresses. */
757
758 WRITE_FAILED:
759
760 addrlist->transport_return = PANIC;
761 addrlist->basic_errno = errno;
762 if (errno == ERRNO_CHHEADER_FAIL)
763 addrlist->message =
764 string_sprintf("Failed to expand headers_add or headers_remove: %s",
765 expand_string_message);
766 else if (errno == ERRNO_FILTER_FAIL)
767 addrlist->message = string_sprintf("Filter process failure");
768 else if (errno == ERRNO_WRITEINCOMPLETE)
769 addrlist->message = string_sprintf("Failed repeatedly to write data");
770 else if (errno == ERRNO_SMTPFORMAT)
771 addrlist->message = US"overlong LMTP command generated";
772 else
773 addrlist->message = string_sprintf("Error %d", errno);
774
775 /* Come here after errors. Kill off the process. */
776
777 KILL_AND_RETURN:
778
779 if (pid > 0) killpg(pid, SIGKILL);
780
781 /* Come here from all paths after the subprocess is created. Wait for the
782 process, but with a timeout. */
783
784 RETURN:
785
786 (void)child_close(pid, timeout);
787
788 if (fd_in >= 0) (void)close(fd_in);
789 if (fd_out >= 0) (void)fclose(out);
790
791 DEBUG(D_transport)
792 debug_printf("%s transport yields %d\n", tblock->name, yield);
793
794 return yield;
795
796
797 MINUS_N:
798 DEBUG(D_transport)
799 debug_printf("*** delivery by %s transport bypassed by -N option",
800 tblock->name);
801 addrlist->transport_return = OK;
802 return FALSE;
803 }
804
805 #endif /*!MACRO_PREDEF*/
806 /* End of transport/lmtp.c */