1 /* $Cambridge: exim/src/src/moan.c,v 1.4 2005/11/14 13:56:49 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
8 /* See the file NOTICE for conditions of use and distribution. */
10 /* Functions for sending messages to sender or to mailmaster. */
17 /*************************************************
18 * Send error message *
19 *************************************************/
21 /* This function sends an error message by opening a pipe to a new process
22 running Exim, and writing a message to it using the "-t" option. This is not
23 used for delivery failures, which have their own code for handing failed
27 recipient addressee for the message
28 ident identifies the type of error
29 eblock chain of error_blocks containing data about the error
30 headers the message's headers
31 message_file FILE containing the body of the message
32 firstline contains first line of file, if it was read to check for
33 "From ", but it turned out not to be
35 Returns: TRUE if message successfully sent
39 moan_send_message(uschar *recipient, int ident, error_block *eblock,
40 header_line *headers, FILE *message_file, uschar *firstline)
46 int size_limit = bounce_return_size_limit;
48 int pid = child_open_exim(&fd);
50 /* Creation of child failed */
54 DEBUG(D_any) debug_printf("Failed to create child to send message: %s\n",
58 else DEBUG(D_any) debug_printf("Child process %d for sending message\n", pid);
60 /* Creation of child succeeded */
63 if (errors_reply_to != NULL) fprintf(f, "Reply-To: %s\n", errors_reply_to);
64 fprintf(f, "Auto-Submitted: auto-replied\n");
65 fprintf(f, "From: Mail Delivery System <Mailer-Daemon@%s>\n",
66 qualify_domain_sender);
67 fprintf(f, "To: %s\n", recipient);
71 case ERRMESS_BADARGADDRESS:
73 "Subject: Mail failure - malformed recipient address\n\n");
75 "A message that you sent contained a recipient address that was incorrectly\n"
77 fprintf(f, " %s %s\n", eblock->text1, eblock->text2);
78 count = Ustrlen(eblock->text1);
79 if (count > 0 && eblock->text1[count-1] == '.')
81 "\nRecipient addresses must not end with a '.' character.\n");
83 "\nThe message has not been delivered to any recipients.\n");
86 case ERRMESS_BADNOADDRESS:
87 case ERRMESS_BADADDRESS:
89 "Subject: Mail failure - malformed recipient address\n\n");
91 "A message that you sent contained one or more recipient addresses that were\n"
92 "incorrectly constructed:\n\n");
94 while (eblock != NULL)
96 fprintf(f, " %s: %s\n", eblock->text1, eblock->text2);
98 eblock = eblock->next;
101 fprintf(f, (count == 1)? "\nThis address has been ignored. " :
102 "\nThese addresses have been ignored. ");
104 fprintf(f, (ident == ERRMESS_BADADDRESS)?
105 "The other addresses in the message were\n"
106 "syntactically valid and have been passed on for an attempt at delivery.\n" :
108 "There were no other addresses in your\n"
109 "message, and so no attempt at delivery was possible.\n");
112 case ERRMESS_IGADDRESS:
113 fprintf(f, "Subject: Mail failure - no recipient addresses\n\n");
115 "A message that you sent using the -t command line option contained no\n"
116 "addresses that were not also on the command line, and were therefore\n"
117 "suppressed. This left no recipient addresses, and so no delivery could\n"
121 case ERRMESS_NOADDRESS:
122 fprintf(f, "Subject: Mail failure - no recipient addresses\n\n");
124 "A message that you sent contained no recipient addresses, and therefore no\n"
125 "delivery could be attempted.\n");
129 fprintf(f, "Subject: Mail failure - system failure\n\n");
131 "A system failure was encountered while processing a message that you sent,\n"
132 "so it has not been possible to deliver it. The error was:\n\n%s\n",
136 case ERRMESS_VLONGHEADER:
137 fprintf(f, "Subject: Mail failure - overlong header section\n\n");
139 "A message that you sent contained a header section that was excessively\n"
140 "long and could not be handled by the mail transmission software. The\n"
141 "message has not been delivered to any recipients.\n");
144 case ERRMESS_VLONGHDRLINE:
145 fprintf(f, "Subject: Mail failure - overlong header line\n\n");
147 "A message that you sent contained a header line that was excessively\n"
148 "long and could not be handled by the mail transmission software. The\n"
149 "message has not been delivered to any recipients.\n");
153 fprintf(f, "Subject: Mail failure - message too big\n\n");
155 "A message that you sent was longer than the maximum size allowed on this\n"
156 "system. It was not delivered to any recipients.\n");
159 case ERRMESS_TOOMANYRECIP:
160 fprintf(f, "Subject: Mail failure - too many recipients\n\n");
162 "A message that you sent contained more recipients than allowed on this\n"
163 "system. It was not delivered to any recipients.\n");
166 case ERRMESS_LOCAL_SCAN:
167 case ERRMESS_LOCAL_ACL:
168 fprintf(f, "Subject: Mail failure - rejected by local scanning code\n\n");
170 "A message that you sent was rejected by the local scanning code that\n"
171 "checks incoming messages on this system.");
172 if (eblock->text1 != NULL)
175 " The following error was given:\n\n %s", eblock->text1);
181 fprintf(f, "Subject: Mail failure\n\n");
183 "A message that you sent has caused the error routine to be entered with\n"
184 "an unknown error number (%d).\n", ident);
188 /* Now copy the message - headers then the rest of the input if
189 available, up to the configured limit. */
191 if (size_limit == 0 || size_limit > thismessage_size_limit)
192 size_limit = thismessage_size_limit;
194 if (size_limit > 0 && size_limit < message_size)
204 "------ This is a copy of your message, including all the headers.\n"
205 "------ No more than %d%s characters of the body are included.\n\n", x, k);
208 "------ This is a copy of your message, including all the headers. ------"
211 /* If the error occurred before the Received: header was created, its text
212 field will still be NULL; just omit such a header line. */
214 while (headers != NULL)
216 if (headers->text != NULL) fprintf(f, "%s", CS headers->text);
217 headers = headers->next;
220 if (ident != ERRMESS_VLONGHEADER && ident != ERRMESS_VLONGHDRLINE)
223 /* After early detection of an error, the message file may be STDIN,
224 in which case we might have to terminate on a line containing just "."
225 as well as on EOF. We may already have the first line in memory. */
227 if (message_file != NULL)
231 BOOL enddot = dot_ends && message_file == stdin;
232 if (firstline != NULL) fprintf(f, "%s", CS firstline);
233 while ((ch = fgetc(message_file)) != EOF)
236 if (size_limit > 0 && ++written > size_limit) break;
239 if (state == 0) { if (ch == '\n') state = 1; }
241 { if (ch == '.') state = 2; else if (ch != '\n') state = 0; }
243 { if (ch == '\n') break; else state = 0; }
248 /* Close the file, which should send an EOF to the child process
249 that is receiving the message. Wait for it to finish, without a timeout. */
252 status = child_close(pid, 0); /* Waits for child to close */
255 uschar *msg = US"Child mail process returned status";
257 log_write(0, LOG_MAIN, "%s %d: errno=%d: %s", msg, status, errno,
260 log_write(0, LOG_MAIN, "%s %d", msg, status);
269 /*************************************************
270 * Send message to sender *
271 *************************************************/
273 /* This function is called when errors are detected during the receipt of a
274 message. Delivery failures are handled separately in deliver.c.
276 If there is a valid sender_address, and the failing message is not a local
277 error message, then this function calls moan_send_message to send a message to
278 that person. If the sender's address is null, then an error has occurred with a
279 message that was generated by a mailer daemon. All we can do is to write
280 information to log files. The same action is taken if local_error_message is
281 set - this can happen for non null-senders in certain configurations where exim
282 doesn't run setuid root.
285 ident identifies the particular error
286 eblock chain of error_blocks containing data about the error
287 headers message's headers (chain)
288 message_file a FILE where the body of the message can be read
289 check_sender if TRUE, read the first line of the file for a possible
290 "From " sender (if a trusted caller)
292 Returns: FALSE if there is no sender_address to send to;
293 else the return from moan_send_message()
297 moan_to_sender(int ident, error_block *eblock, header_line *headers,
298 FILE *message_file, BOOL check_sender)
300 uschar *firstline = NULL;
301 uschar *msg = US"Error while reading message with no usable sender address";
303 if (message_reference != NULL)
304 msg = string_sprintf("%s (R=%s)", msg, message_reference);
306 /* Find the sender from a From line if permitted and possible */
308 if (check_sender && message_file != NULL && trusted_caller &&
309 Ufgets(big_buffer, BIG_BUFFER_SIZE, message_file) != NULL)
311 uschar *new_sender = NULL;
312 if (regex_match_and_setup(regex_From, big_buffer, 0, -1))
313 new_sender = expand_string(uucp_from_sender);
314 if (new_sender != NULL) sender_address = new_sender;
315 else firstline = big_buffer;
318 /* If viable sender address, send a message */
320 if (sender_address != NULL && sender_address[0] != 0 && !local_error_message)
321 return moan_send_message(sender_address, ident, eblock, headers,
322 message_file, firstline);
324 /* Otherwise, we can only log */
328 case ERRMESS_BADARGADDRESS:
329 case ERRMESS_BADNOADDRESS:
330 case ERRMESS_BADADDRESS:
331 log_write(0, LOG_MAIN, "%s: at least one malformed recipient address: "
332 "%s - %s", msg, eblock->text1, eblock->text2);
335 case ERRMESS_IGADDRESS:
336 case ERRMESS_NOADDRESS:
337 log_write(0, LOG_MAIN, "%s: no recipient addresses", msg);
340 /* This error has already been logged. */
344 case ERRMESS_VLONGHEADER:
345 log_write(0, LOG_MAIN, "%s: excessively long message header section read "
346 "(more than %d characters)", msg, header_maxsize);
349 case ERRMESS_VLONGHDRLINE:
350 log_write(0, LOG_MAIN, "%s: excessively long message header line read "
351 "(more than %d characters)", msg, header_line_maxsize);
355 log_write(0, LOG_MAIN, "%s: message too big (limit set to %d)", msg,
356 thismessage_size_limit);
359 case ERRMESS_TOOMANYRECIP:
360 log_write(0, LOG_MAIN, "%s: too many recipients (max set to %d)", msg,
364 case ERRMESS_LOCAL_SCAN:
365 log_write(0, LOG_MAIN, "%s: rejected by local_scan: %s", msg, eblock->text1);
368 case ERRMESS_LOCAL_ACL:
369 log_write(0, LOG_MAIN, "%s: rejected by non-SMTP ACL: %s", msg, eblock->text1);
373 log_write(0, LOG_MAIN|LOG_PANIC, "%s: unknown error number %d", msg,
383 /*************************************************
384 * Send message to someone *
385 *************************************************/
387 /* This is called when exim is configured to tell someone (often the
388 mailmaster) about some incident.
391 who address to send mail to
392 addr chain of deferred addresses whose details are to be included
393 subject subject text for the message
394 format a printf() format for the body of the message
395 ... arguments for the format
401 moan_tell_someone(uschar *who, address_item *addr, uschar *subject,
407 int pid = child_open_exim(&fd);
411 DEBUG(D_any) debug_printf("Failed to create child to send message: %s\n",
416 f = fdopen(fd, "wb");
417 fprintf(f, "Auto-Submitted: auto-replied\n");
418 fprintf(f, "From: Mail Delivery System <Mailer-Daemon@%s>\n",
419 qualify_domain_sender);
420 fprintf(f, "To: %s\n", who);
421 fprintf(f, "Subject: %s\n\n", subject);
422 va_start(ap, format);
423 vfprintf(f, format, ap);
428 fprintf(f, "\nThe following address(es) have yet to be delivered:\n");
429 for (; addr != NULL; addr = addr->next)
431 uschar *parent = (addr->parent == NULL)? NULL : addr->parent->address;
432 fprintf(f, " %s", addr->address);
433 if (parent != NULL) fprintf(f, " <%s>", parent);
434 if (addr->basic_errno > 0) fprintf(f, ": %s", strerror(addr->basic_errno));
435 if (addr->message != NULL) fprintf(f, ": %s", addr->message);
441 child_close(pid, 0); /* Waits for child to close; no timeout */
446 /*************************************************
447 * Handle SMTP batch error *
448 *************************************************/
450 /* This is called when something goes wrong in batched (-bS) SMTP input.
451 Information is written to stdout and/or stderr, and Exim exits with a non-zero
452 completion code. BSMTP is almost always called by some other program, so it is
453 up to that program to interpret the return code and do something with the error
454 information, and also to preserve the batch input file for human analysis.
456 Formerly, Exim used to attempt to continue after some errors, but this strategy
457 has been abandoned as it can lead to loss of messages.
460 cmd_buffer the command causing the error, or NULL
461 format a printf() format
462 ... arguments for the format
464 Returns: does not return; exits from the program
465 exit code = 1 if some messages were accepted
466 exit code = 2 if no messages were accepted
470 moan_smtp_batch(uschar *cmd_buffer, char *format, ...)
473 int yield = (receive_messagecount > 0)? 1 : 2;
475 DEBUG(D_any) debug_printf("Handling error in batched SMTP input\n");
477 /* On stdout, write stuff that a program could parse fairly easily. */
479 va_start(ap, format);
480 vfprintf(stdout, format, ap);
483 fprintf(stdout, "\nTransaction started in line %d\n",
484 bsmtp_transaction_linecount);
485 fprintf(stdout, "Error detected in line %d\n", receive_linecount);
486 if (cmd_buffer != NULL) fprintf(stdout, "%s\n", cmd_buffer);
488 /* On stderr, write stuff for human consumption */
491 "An error was detected while processing a file of BSMTP input.\n"
492 "The error message was:\n\n ");
494 va_start(ap, format);
495 vfprintf(stderr, format, ap);
499 "\n\nThe SMTP transaction started in line %d.\n"
500 "The error was detected in line %d.\n",
501 bsmtp_transaction_linecount, receive_linecount);
503 if (cmd_buffer != NULL)
505 fprintf(stderr, "The SMTP command at fault was:\n\n %s\n\n",
509 fprintf(stderr, "%d previous message%s successfully processed.\n",
510 receive_messagecount, (receive_messagecount == 1)? " was" : "s were");
512 fprintf(stderr, "The rest of the batch was abandoned.\n");
520 /*************************************************
521 * Check for error copies *
522 *************************************************/
524 /* This function is passed the recipient of an error message, and must check
525 the error_copies string to see whether there is an additional recipient list to
526 which errors for this recipient must be bcc'd. The incoming recipient is always
529 Argument: recipient address
530 Returns: additional recipient list or NULL
534 moan_check_errorcopy(uschar *recipient)
536 uschar *item, *localpart, *domain;
537 uschar *listptr = errors_copy;
538 uschar *yield = NULL;
543 if (errors_copy == NULL) return NULL;
545 /* Set up pointer to the local part and domain, and compute the
546 length of the local part. */
548 localpart = recipient;
549 domain = Ustrchr(recipient, '@');
550 if (domain == NULL) return NULL; /* should not occur, but avoid crash */
551 llen = domain++ - recipient;
553 /* Scan through the configured items */
555 while ((item = string_nextinlist(&listptr, &sep, buffer, sizeof(buffer)))
558 uschar *newaddress = item;
559 uschar *pattern = string_dequote(&newaddress);
561 /* If no new address found, just skip this item. */
563 while (isspace(*newaddress)) newaddress++;
564 if (*newaddress == 0) continue;
566 /* We now have an item to match as an address in item, and the additional
567 address in newaddress. If the pattern matches, expand the new address string
568 and return it. During expansion, make local part and domain available for
569 insertion. This requires a copy to be made; we can't just temporarily
570 terminate it, as the whole address is required for $0. */
572 if (match_address_list(recipient, TRUE, TRUE, &pattern, NULL, 0, UCHAR_MAX+1,
576 Ustrncpy(temp, localpart, llen);
578 deliver_localpart = temp;
579 deliver_domain = domain;
580 yield = expand_string_copy(newaddress);
581 deliver_domain = deliver_localpart = NULL;
583 log_write(0, LOG_MAIN|LOG_PANIC, "Failed to expand %s when processing "
584 "errors_copy: %s", newaddress, expand_string_message);
589 DEBUG(D_any) debug_printf("errors_copy check returned %s\n",
590 (yield == NULL)? US"NULL" : yield);
598 /************************************************
599 * Handle skipped syntax errors *
600 ************************************************/
602 /* This function is called by the redirect router when it has skipped over one
603 or more syntax errors in the list of addresses. If there is an address to mail
604 to, send a message, and always write the information to the log. In the case of
605 a filter file, a "syntax error" might actually be something else, such as the
606 inability to open a log file. Thus, the wording of the error message is
610 rname the router name
611 eblock chain of error blocks
612 syntax_errors_to address to send mail to, or NULL
613 some TRUE if some addresses were generated; FALSE if none were
614 custom custom message text
616 Returns: FALSE if string expansion failed; TRUE otherwise
620 moan_skipped_syntax_errors(uschar *rname, error_block *eblock,
621 uschar *syntax_errors_to, BOOL some, uschar *custom)
628 for (e = eblock; e != NULL; e = e->next)
630 if (e->text2 != NULL)
631 log_write(0, LOG_MAIN, "%s router: skipped error: %s in \"%s\"",
632 rname, e->text1, e->text2);
634 log_write(0, LOG_MAIN, "%s router: skipped error: %s", rname,
638 if (syntax_errors_to == NULL) return TRUE;
640 s = expand_string(syntax_errors_to);
643 log_write(0, LOG_MAIN, "%s router failed to expand %s: %s", rname,
644 syntax_errors_to, expand_string_message);
648 /* If we can't create a process to send the message, just forget about
651 pid = child_open_exim(&fd);
655 DEBUG(D_any) debug_printf("Failed to create child to send message: %s\n",
660 f = fdopen(fd, "wb");
661 fprintf(f, "Auto-Submitted: auto-replied\n");
662 fprintf(f, "From: Mail Delivery System <Mailer-Daemon@%s>\n",
663 qualify_domain_sender);
664 fprintf(f, "To: %s\n", s);
665 fprintf(f, "Subject: error(s) in forwarding or filtering\n\n");
669 t = expand_string(custom);
672 log_write(0, LOG_MAIN, "%s router failed to expand %s: %s", rname,
673 custom, expand_string_message);
676 fprintf(f, "%s\n\n", t);
679 fprintf(f, "The %s router encountered the following error(s):\n\n",
682 for (e = eblock; e != NULL; e = e->next)
684 fprintf(f, " %s", e->text1);
685 if (e->text2 != NULL)
686 fprintf(f, " in the address\n \"%s\"", e->text2);
691 fprintf(f, "Other addresses were processed normally.\n");
693 fprintf(f, "No valid addresses were generated.\n");
696 child_close(pid, 0); /* Waits for child to close; no timeout */