79ad67d01fcbdee388ef86c11cdbf4bad6cb1f26
[exim.git] / src / src / transports / lmtp.c
1 /* $Cambridge: exim/src/src/transports/lmtp.c,v 1.7 2006/02/07 11:19:03 ph10 Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2006 */
8 /* See the file NOTICE for conditions of use and distribution. */
9
10
11 #include "../exim.h"
12 #include "lmtp.h"
13
14 #define PENDING_OK 256
15
16
17 /* Options specific to the lmtp transport. They must be in alphabetic
18 order (note that "_" comes before the lower case letters). Those starting
19 with "*" are not settable by the user but are used by the option-reading
20 software for alternative value types. Some options are stored in the transport
21 instance block so as to be publicly visible; these are flagged with opt_public.
22 */
23
24 optionlist lmtp_transport_options[] = {
25 { "batch_id", opt_stringptr | opt_public,
26 (void *)offsetof(transport_instance, batch_id) },
27 { "batch_max", opt_int | opt_public,
28 (void *)offsetof(transport_instance, batch_max) },
29 { "command", opt_stringptr,
30 (void *)offsetof(lmtp_transport_options_block, cmd) },
31 { "ignore_quota", opt_bool,
32 (void *)offsetof(lmtp_transport_options_block, ignore_quota) },
33 { "socket", opt_stringptr,
34 (void *)offsetof(lmtp_transport_options_block, skt) },
35 { "timeout", opt_time,
36 (void *)offsetof(lmtp_transport_options_block, timeout) }
37 };
38
39 /* Size of the options list. An extern variable has to be used so that its
40 address can appear in the tables drtables.c. */
41
42 int lmtp_transport_options_count =
43 sizeof(lmtp_transport_options)/sizeof(optionlist);
44
45 /* Default private options block for the lmtp transport. */
46
47 lmtp_transport_options_block lmtp_transport_option_defaults = {
48 NULL, /* cmd */
49 NULL, /* skt */
50 5*60, /* timeout */
51 0, /* options */
52 FALSE /* ignore_quota */
53 };
54
55
56
57 /*************************************************
58 * Initialization entry point *
59 *************************************************/
60
61 /* Called for each instance, after its options have been read, to
62 enable consistency checks to be done, or anything else that needs
63 to be set up. */
64
65 void
66 lmtp_transport_init(transport_instance *tblock)
67 {
68 lmtp_transport_options_block *ob =
69 (lmtp_transport_options_block *)(tblock->options_block);
70
71 /* Either the command field or the socket field must be set */
72
73 if ((ob->cmd == NULL) == (ob->skt == NULL))
74 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
75 "one (and only one) of command or socket must be set for the %s transport",
76 tblock->name);
77
78 /* If a fixed uid field is set, then a gid field must also be set. */
79
80 if (tblock->uid_set && !tblock->gid_set && tblock->expand_gid == NULL)
81 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
82 "user set without group for the %s transport", tblock->name);
83
84 /* Set up the bitwise options for transport_write_message from the various
85 driver options. Only one of body_only and headers_only can be set. */
86
87 ob->options |=
88 (tblock->body_only? topt_no_headers : 0) |
89 (tblock->headers_only? topt_no_body : 0) |
90 (tblock->return_path_add? topt_add_return_path : 0) |
91 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
92 (tblock->envelope_to_add? topt_add_envelope_to : 0) |
93 topt_use_crlf | topt_end_dot;
94 }
95
96
97 /*************************************************
98 * Check an LMTP response *
99 *************************************************/
100
101 /* This function is given an errno code and the LMTP response buffer to
102 analyse. It sets an appropriate message and puts the first digit of the
103 response code into the yield variable. If no response was actually read, a
104 suitable digit is chosen.
105
106 Arguments:
107 errno_value pointer to the errno value
108 more_errno from the top address for use with ERRNO_FILTER_FAIL
109 buffer the LMTP response buffer
110 yield where to put a one-digit LMTP response code
111 message where to put an errror message
112
113 Returns: TRUE if a "QUIT" command should be sent, else FALSE
114 */
115
116 static BOOL check_response(int *errno_value, int more_errno, uschar *buffer,
117 int *yield, uschar **message)
118 {
119 *yield = '4'; /* Default setting is to give a temporary error */
120
121 /* Handle response timeout */
122
123 if (*errno_value == ETIMEDOUT)
124 {
125 *message = string_sprintf("LMTP timeout after %s", big_buffer);
126 if (transport_count > 0)
127 *message = string_sprintf("%s (%d bytes written)", *message,
128 transport_count);
129 *errno_value = 0;
130 return FALSE;
131 }
132
133 /* Handle malformed LMTP response */
134
135 if (*errno_value == ERRNO_SMTPFORMAT)
136 {
137 *message = string_sprintf("Malformed LMTP response after %s: %s",
138 big_buffer, string_printing(buffer));
139 return FALSE;
140 }
141
142 /* Handle a failed filter process error; can't send QUIT as we mustn't
143 end the DATA. */
144
145 if (*errno_value == ERRNO_FILTER_FAIL)
146 {
147 *message = string_sprintf("transport filter process failed (%d)%s",
148 more_errno,
149 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
150 return FALSE;
151 }
152
153 /* Handle a failed add_headers expansion; can't send QUIT as we mustn't
154 end the DATA. */
155
156 if (*errno_value == ERRNO_CHHEADER_FAIL)
157 {
158 *message =
159 string_sprintf("failed to expand headers_add or headers_remove: %s",
160 expand_string_message);
161 return FALSE;
162 }
163
164 /* Handle failure to write a complete data block */
165
166 if (*errno_value == ERRNO_WRITEINCOMPLETE)
167 {
168 *message = string_sprintf("failed to write a data block");
169 return FALSE;
170 }
171
172 /* Handle error responses from the remote process. */
173
174 if (buffer[0] != 0)
175 {
176 uschar *s = string_printing(buffer);
177 *message = string_sprintf("LMTP error after %s: %s", big_buffer, s);
178 *yield = buffer[0];
179 return TRUE;
180 }
181
182 /* No data was read. If there is no errno, this must be the EOF (i.e.
183 connection closed) case, which causes deferral. Otherwise, leave the errno
184 value to be interpreted. In all cases, we have to assume the connection is now
185 dead. */
186
187 if (*errno_value == 0)
188 {
189 *errno_value = ERRNO_SMTPCLOSED;
190 *message = string_sprintf("LMTP connection closed after %s", big_buffer);
191 }
192
193 return FALSE;
194 }
195
196
197
198 /*************************************************
199 * Write LMTP command *
200 *************************************************/
201
202 /* The formatted command is left in big_buffer so that it can be reflected in
203 any error message.
204
205 Arguments:
206 fd the fd to write to
207 format a format, starting with one of
208 of HELO, MAIL FROM, RCPT TO, DATA, ".", or QUIT.
209 ... data for the format
210
211 Returns: TRUE if successful, FALSE if not, with errno set
212 */
213
214 static BOOL
215 lmtp_write_command(int fd, char *format, ...)
216 {
217 int count, rc;
218 va_list ap;
219 va_start(ap, format);
220 if (!string_vformat(big_buffer, big_buffer_size, CS format, ap))
221 {
222 errno = ERRNO_SMTPFORMAT;
223 return FALSE;
224 }
225 va_end(ap);
226 count = Ustrlen(big_buffer);
227 DEBUG(D_transport|D_v) debug_printf(" LMTP>> %s", big_buffer);
228 rc = write(fd, big_buffer, count);
229 big_buffer[count-2] = 0; /* remove \r\n for debug and error message */
230 if (rc > 0) return TRUE;
231 DEBUG(D_transport) debug_printf("write failed: %s\n", strerror(errno));
232 return FALSE;
233 }
234
235
236
237
238 /*************************************************
239 * Read LMTP response *
240 *************************************************/
241
242 /* This function reads an LMTP response with a timeout, and returns the
243 response in the given buffer. It also analyzes the first digit of the reply
244 code and returns FALSE if it is not acceptable.
245
246 FALSE is also returned after a reading error. In this case buffer[0] will be
247 zero, and the error code will be in errno.
248
249 Arguments:
250 f a file to read from
251 buffer where to put the response
252 size the size of the buffer
253 okdigit the expected first digit of the response
254 timeout the timeout to use
255
256 Returns: TRUE if a valid, non-error response was received; else FALSE
257 */
258
259 static BOOL
260 lmtp_read_response(FILE *f, uschar *buffer, int size, int okdigit, int timeout)
261 {
262 int count;
263 uschar *ptr = buffer;
264 uschar *readptr = buffer;
265
266 /* Ensure errno starts out zero */
267
268 errno = 0;
269
270 /* Loop for handling LMTP responses that do not all come in one line. */
271
272 for (;;)
273 {
274 /* If buffer is too full, something has gone wrong. */
275
276 if (size < 10)
277 {
278 *readptr = 0;
279 errno = ERRNO_SMTPFORMAT;
280 return FALSE;
281 }
282
283 /* Loop to cover the read getting interrupted. */
284
285 for (;;)
286 {
287 char *rc;
288 int save_errno;
289
290 *readptr = 0; /* In case nothing gets read */
291 sigalrm_seen = FALSE;
292 alarm(timeout);
293 rc = Ufgets(readptr, size-1, f);
294 save_errno = errno;
295 alarm(0);
296 errno = save_errno;
297
298 if (rc != NULL) break; /* A line has been read */
299
300 /* Handle timeout; must do this first because it uses EINTR */
301
302 if (sigalrm_seen) errno = ETIMEDOUT;
303
304 /* If some other interrupt arrived, just retry. We presume this to be rare,
305 but it can happen (e.g. the SIGUSR1 signal sent by exiwhat causes
306 read() to exit). */
307
308 else if (errno == EINTR)
309 {
310 DEBUG(D_transport) debug_printf("EINTR while reading LMTP response\n");
311 continue;
312 }
313
314 /* Handle other errors, including EOF; ensure buffer is completely empty. */
315
316 buffer[0] = 0;
317 return FALSE;
318 }
319
320 /* Adjust size in case we have to read another line, and adjust the
321 count to be the length of the line we are about to inspect. */
322
323 count = Ustrlen(readptr);
324 size -= count;
325 count += readptr - ptr;
326
327 /* See if the final two characters in the buffer are \r\n. If not, we
328 have to read some more. At least, that is what we should do on a strict
329 interpretation of the RFC. But accept LF as well, as we do for SMTP. */
330
331 if (ptr[count-1] != '\n')
332 {
333 DEBUG(D_transport)
334 {
335 int i;
336 debug_printf("LMTP input line incomplete in one buffer:\n ");
337 for (i = 0; i < count; i++)
338 {
339 int c = (ptr[i]);
340 if (mac_isprint(c)) debug_printf("%c", c); else debug_printf("<%d>", c);
341 }
342 debug_printf("\n");
343 }
344 readptr = ptr + count;
345 continue;
346 }
347
348 /* Remove any whitespace at the end of the buffer. This gets rid of CR, LF
349 etc. at the end. Show it, if debugging, formatting multi-line responses. */
350
351 while (count > 0 && isspace(ptr[count-1])) count--;
352 ptr[count] = 0;
353
354 DEBUG(D_transport|D_v)
355 {
356 uschar *s = ptr;
357 uschar *t = ptr;
358 while (*t != 0)
359 {
360 while (*t != 0 && *t != '\n') t++;
361 debug_printf(" %s %*s\n", (s == ptr)? "LMTP<<" : " ",
362 (int)(t-s), s);
363 if (*t == 0) break;
364 s = t = t + 1;
365 }
366 }
367
368 /* Check the format of the response: it must start with three digits; if
369 these are followed by a space or end of line, the response is complete. If
370 they are followed by '-' this is a multi-line response and we must look for
371 another line until the final line is reached. The only use made of multi-line
372 responses is to pass them back as error messages. We therefore just
373 concatenate them all within the buffer, which should be large enough to
374 accept any reasonable number of lines. A multiline response may already
375 have been read in one go - hence the loop here. */
376
377 for(;;)
378 {
379 uschar *p;
380 if (count < 3 ||
381 !isdigit(ptr[0]) ||
382 !isdigit(ptr[1]) ||
383 !isdigit(ptr[2]) ||
384 (ptr[3] != '-' && ptr[3] != ' ' && ptr[3] != 0))
385 {
386 errno = ERRNO_SMTPFORMAT; /* format error */
387 return FALSE;
388 }
389
390 /* If a single-line response, exit the loop */
391
392 if (ptr[3] != '-') break;
393
394 /* For a multi-line response see if the next line is already read, and if
395 so, stay in this loop to check it. */
396
397 p = ptr + 3;
398 while (*(++p) != 0)
399 {
400 if (*p == '\n')
401 {
402 ptr = ++p;
403 break;
404 }
405 }
406 if (*p == 0) break; /* No more lines to check */
407 }
408
409 /* End of response. If the last of the lines we are looking at is the final
410 line, we are done. Otherwise more data has to be read. */
411
412 if (ptr[3] != '-') break;
413
414 /* Move the reading pointer upwards in the buffer and insert \n in case this
415 is an error message that subsequently gets printed. Set the scanning pointer
416 to the reading pointer position. */
417
418 ptr += count;
419 *ptr++ = '\n';
420 size--;
421 readptr = ptr;
422 }
423
424 /* Return a value that depends on the LMTP return code. Ensure that errno is
425 zero, because the caller of this function looks at errno when FALSE is
426 returned, to distinguish between an unexpected return code and other errors
427 such as timeouts, lost connections, etc. */
428
429 errno = 0;
430 return buffer[0] == okdigit;
431 }
432
433
434
435
436
437
438 /*************************************************
439 * Main entry point *
440 *************************************************/
441
442 /* See local README for interface details. For setup-errors, this transport
443 returns FALSE, indicating that the first address has the status for all; in
444 normal cases it returns TRUE, indicating that each address has its own status
445 set. */
446
447 BOOL
448 lmtp_transport_entry(
449 transport_instance *tblock, /* data for this instantiation */
450 address_item *addrlist) /* address(es) we are working on */
451 {
452 pid_t pid = 0;
453 FILE *out;
454 lmtp_transport_options_block *ob =
455 (lmtp_transport_options_block *)(tblock->options_block);
456 struct sockaddr_un sockun; /* don't call this "sun" ! */
457 int timeout = ob->timeout;
458 int fd_in = -1, fd_out = -1;
459 int code, save_errno;
460 BOOL send_data;
461 BOOL yield = FALSE;
462 address_item *addr;
463 uschar *igquotstr = US"";
464 uschar *sockname = NULL;
465 uschar **argv;
466 uschar buffer[256];
467
468 DEBUG(D_transport) debug_printf("%s transport entered\n", tblock->name);
469
470 /* Initialization ensures that either a command or a socket is specified, but
471 not both. When a command is specified, call the common function for creating an
472 argument list and expanding the items. */
473
474 if (ob->cmd != NULL)
475 {
476 DEBUG(D_transport) debug_printf("using command %s\n", ob->cmd);
477 sprintf(CS buffer, "%.50s transport", tblock->name);
478 if (!transport_set_up_command(&argv, ob->cmd, TRUE, PANIC, addrlist, buffer,
479 NULL))
480 return FALSE;
481 }
482
483 /* When a socket is specified, expand the string and create a socket. */
484
485 else
486 {
487 DEBUG(D_transport) debug_printf("using socket %s\n", ob->skt);
488 sockname = expand_string(ob->skt);
489 if (sockname == NULL)
490 {
491 addrlist->message = string_sprintf("Expansion of \"%s\" (socket setting "
492 "for %s transport) failed: %s", ob->skt, tblock->name,
493 expand_string_message);
494 return FALSE;
495 }
496 if ((fd_in = fd_out = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
497 {
498 addrlist->message = string_sprintf(
499 "Failed to create socket %s for %s transport: %s",
500 ob->skt, tblock->name, strerror(errno));
501 return FALSE;
502 }
503 }
504
505 /* If the -N option is set, can't do any more. Presume all has gone well. */
506
507 if (dont_deliver)
508 {
509 DEBUG(D_transport)
510 debug_printf("*** delivery by %s transport bypassed by -N option",
511 tblock->name);
512 addrlist->transport_return = OK;
513 return FALSE;
514 }
515
516 /* As this is a local transport, we are already running with the required
517 uid/gid and current directory. Request that the new process be a process group
518 leader, so we can kill it and all its children on an error. */
519
520 if (ob->cmd != NULL)
521 {
522 if ((pid = child_open(argv, NULL, 0, &fd_in, &fd_out, TRUE)) < 0)
523 {
524 addrlist->message = string_sprintf(
525 "Failed to create child process for %s transport: %s", tblock->name,
526 strerror(errno));
527 return FALSE;
528 }
529 }
530
531 /* For a socket, try to make the connection */
532
533 else
534 {
535 sockun.sun_family = AF_UNIX;
536 sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1), sockname);
537 if(connect(fd_out, (struct sockaddr *)(&sockun), sizeof(sockun)) == -1)
538 {
539 addrlist->message = string_sprintf(
540 "Failed to connect to socket %s for %s transport: %s",
541 sockun.sun_path, tblock->name, strerror(errno));
542 return FALSE;
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 goto RESPONSE_FAILED;
582
583 /* Next, we hand over all the recipients. Some may be permanently or
584 temporarily rejected; others may be accepted, for now. */
585
586 send_data = FALSE;
587 for (addr = addrlist; addr != NULL; addr = addr->next)
588 {
589 if (!lmtp_write_command(fd_in, "RCPT TO:<%s>%s\r\n",
590 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr))
591 goto WRITE_FAILED;
592 if (lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout))
593 {
594 send_data = TRUE;
595 addr->transport_return = PENDING_OK;
596 }
597 else
598 {
599 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
600 addr->message = string_sprintf("LMTP error after %s: %s", big_buffer,
601 string_printing(buffer));
602 if (buffer[0] == '5') addr->transport_return = FAIL; else
603 {
604 int bincode = (buffer[1] - '0')*10 + buffer[2] - '0';
605 addr->basic_errno = ERRNO_RCPT4XX;
606 addr->more_errno |= bincode << 8;
607 }
608 }
609 }
610
611 /* Now send the text of the message if there were any good recipients. */
612
613 if (send_data)
614 {
615 BOOL ok;
616
617 if (!lmtp_write_command(fd_in, "DATA\r\n")) goto WRITE_FAILED;
618 if (!lmtp_read_response(out, buffer, sizeof(buffer), '3', timeout))
619 goto RESPONSE_FAILED;
620
621 sigalrm_seen = FALSE;
622 transport_write_timeout = timeout;
623 Ustrcpy(big_buffer, "sending data block"); /* For error messages */
624 DEBUG(D_transport|D_v)
625 debug_printf(" LMTP>> writing message and terminating \".\"\n");
626
627 transport_count = 0;
628 ok = transport_write_message(addrlist, fd_in, ob->options, 0,
629 tblock->add_headers, tblock->remove_headers, US".", US"..",
630 tblock->rewrite_rules, tblock->rewrite_existflags);
631
632 /* Failure can either be some kind of I/O disaster (including timeout),
633 or the failure of a transport filter or the expansion of added headers. */
634
635 if (!ok)
636 {
637 buffer[0] = 0; /* There hasn't been a response */
638 goto RESPONSE_FAILED;
639 }
640
641 Ustrcpy(big_buffer, "end of data"); /* For error messages */
642
643 /* We now expect a response for every address that was accepted above,
644 in the same order. For those that get a response, their status is fixed;
645 any that are accepted have been handed over, even if later responses crash -
646 at least, that's how I read RFC 2033. */
647
648 for (addr = addrlist; addr != NULL; addr = addr->next)
649 {
650 if (addr->transport_return != PENDING_OK) continue;
651
652 if (lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout))
653 addr->transport_return = OK;
654
655 /* If the response has failed badly, use it for all the remaining pending
656 addresses and give up. */
657
658 else if (errno != 0 || buffer[0] == 0)
659 {
660 address_item *a;
661 save_errno = errno;
662 check_response(&save_errno, addr->more_errno, buffer, &code,
663 &(addr->message));
664 addr->transport_return = (code == '5')? FAIL : DEFER;
665 for (a = addr->next; a != NULL; a = a->next)
666 {
667 if (a->transport_return != PENDING_OK) continue;
668 a->basic_errno = addr->basic_errno;
669 a->message = addr->message;
670 a->transport_return = addr->transport_return;
671 }
672 break;
673 }
674
675 /* Otherwise, it's an LMTP error code return for one address */
676
677 else
678 {
679 addr->message = string_sprintf("LMTP error after %s: %s", big_buffer,
680 string_printing(buffer));
681 addr->transport_return = (buffer[0] == '5')? FAIL : DEFER;
682 }
683 }
684 }
685
686 /* The message transaction has completed successfully - this doesn't mean that
687 all the addresses have necessarily been transferred, but each has its status
688 set, so we change the yield to TRUE. */
689
690 yield = TRUE;
691 (void) lmtp_write_command(fd_in, "QUIT\r\n");
692 (void) lmtp_read_response(out, buffer, sizeof(buffer), '2', 1);
693
694 goto RETURN;
695
696
697 /* Come here if any call to read_response, other than a response after the data
698 phase, failed. Put the error in the top address - this will be replicated
699 because the yield is still FALSE. Analyse the error, and if if isn't too bad,
700 send a QUIT command. Wait for the response with a short timeout, so we don't
701 wind up this process before the far end has had time to read the QUIT. */
702
703 RESPONSE_FAILED:
704
705 save_errno = errno;
706 addrlist->message = NULL;
707
708 if (check_response(&save_errno, addrlist->more_errno,
709 buffer, &code, &(addrlist->message)))
710 {
711 (void) lmtp_write_command(fd_in, "QUIT\r\n");
712 (void) lmtp_read_response(out, buffer, sizeof(buffer), '2', 1);
713 }
714
715 addrlist->transport_return = (code == '5')? FAIL : DEFER;
716 if (code == '4' && save_errno > 0)
717 addrlist->message = string_sprintf("%s: %s", addrlist->message,
718 strerror(save_errno));
719 goto KILL_AND_RETURN;
720
721 /* Come here if there are errors during writing of a command or the message
722 itself. This error will be applied to all the addresses. */
723
724 WRITE_FAILED:
725
726 addrlist->transport_return = PANIC;
727 addrlist->basic_errno = errno;
728 if (errno == ERRNO_CHHEADER_FAIL)
729 addrlist->message =
730 string_sprintf("Failed to expand headers_add or headers_remove: %s",
731 expand_string_message);
732 else if (errno == ERRNO_FILTER_FAIL)
733 addrlist->message = string_sprintf("Filter process failure");
734 else if (errno == ERRNO_WRITEINCOMPLETE)
735 addrlist->message = string_sprintf("Failed repeatedly to write data");
736 else if (errno == ERRNO_SMTPFORMAT)
737 addrlist->message = US"overlong LMTP command generated";
738 else
739 addrlist->message = string_sprintf("Error %d", errno);
740
741 /* Come here after errors. Kill off the process. */
742
743 KILL_AND_RETURN:
744
745 if (pid > 0) killpg(pid, SIGKILL);
746
747 /* Come here from all paths after the subprocess is created. Wait for the
748 process, but with a timeout. */
749
750 RETURN:
751
752 (void)child_close(pid, timeout);
753
754 if (fd_in >= 0) (void)close(fd_in);
755 if (fd_out >= 0) (void)fclose(out);
756
757 DEBUG(D_transport)
758 debug_printf("%s transport yields %d\n", tblock->name, yield);
759
760 return yield;
761 }
762
763 /* End of transport/lmtp.c */