1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
12 #ifdef EXPERIMENTAL_DCC
16 #ifdef EXPERIMENTAL_DMARC
18 #endif /* EXPERIMENTAL_DMARC */
20 /*************************************************
21 * Local static variables *
22 *************************************************/
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
31 /*************************************************
32 * Non-SMTP character reading functions *
33 *************************************************/
35 /* These are the default functions that are set up in the variables such as
36 receive_getc initially. They just call the standard functions, passing stdin as
37 the file. (When SMTP input is occurring, different functions are used by
38 changing the pointer variables.) */
41 stdin_getc(unsigned lim)
49 return ungetc(c, stdin);
67 /*************************************************
68 * Check that a set sender is allowed *
69 *************************************************/
71 /* This function is called when a local caller sets an explicit sender address.
72 It checks whether this is permitted, which it is for trusted callers.
73 Otherwise, it must match the pattern(s) in untrusted_set_sender.
75 Arguments: the proposed sender address
76 Returns: TRUE for a trusted caller
77 TRUE if the address has been set, untrusted_set_sender has been
78 set, and the address matches something in the list
83 receive_check_set_sender(uschar *newsender)
86 if (trusted_caller) return TRUE;
87 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
88 qnewsender = (Ustrchr(newsender, '@') != NULL)?
89 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
91 match_address_list(qnewsender, TRUE, TRUE, CUSS &untrusted_set_sender, NULL, -1,
98 /*************************************************
99 * Read space info for a partition *
100 *************************************************/
102 /* This function is called by receive_check_fs() below, and also by string
103 expansion for variables such as $spool_space. The field names for the statvfs
104 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
105 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
106 have inodes, and they return -1 for the number available.
108 Later: It turns out that some file systems that do not have the concept of
109 inodes return 0 rather than -1. Such systems should also return 0 for the total
110 number of inodes, so we require that to be greater than zero before returning
114 isspool TRUE for spool partition, FALSE for log partition
115 inodeptr address of int to receive inode count; -1 if there isn't one
117 Returns: available on-root space, in kilobytes
118 -1 for log partition if there isn't one
120 All values are -1 if the STATFS functions are not available.
124 receive_statvfs(BOOL isspool, int *inodeptr)
127 struct STATVFS statbuf;
133 /* The spool directory must always exist. */
137 path = spool_directory;
141 /* Need to cut down the log file path to the directory, and to ignore any
142 appearance of "syslog" in it. */
146 int sep = ':'; /* Not variable - outside scripts use */
147 const uschar *p = log_file_path;
150 /* An empty log_file_path means "use the default". This is the same as an
151 empty item in a list. */
153 if (*p == 0) p = US":";
154 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
155 if (Ustrcmp(path, "syslog") != 0)
158 if (path == NULL) /* No log files */
164 /* An empty string means use the default, which is in the spool directory.
165 But don't just use the spool directory, as it is possible that the log
166 subdirectory has been symbolically linked elsewhere. */
170 sprintf(CS buffer, CS"%s/log", CS spool_directory);
176 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
180 /* We now have the path; do the business */
182 memset(&statbuf, 0, sizeof(statbuf));
184 if (STATVFS(CS path, &statbuf) != 0)
185 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
186 { /* Can happen on first run after installation */
192 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
193 "%s directory %s: %s", name, path, strerror(errno));
194 smtp_closedown(US"spool or log directory problem");
195 exim_exit(EXIT_FAILURE);
198 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
200 /* Disks are getting huge. Take care with computing the size in kilobytes. */
202 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
205 /* Unable to find partition sizes in this environment. */
215 /*************************************************
216 * Check space on spool and log partitions *
217 *************************************************/
219 /* This function is called before accepting a message; if any thresholds are
220 set, it checks them. If a message_size is supplied, it checks that there is
221 enough space for that size plus the threshold - i.e. that the message won't
222 reduce the space to the threshold. Not all OS have statvfs(); for those that
223 don't, this function always returns TRUE. For some OS the old function and
224 struct name statfs is used; that is handled by a macro, defined in exim.h.
227 msg_size the (estimated) size of an incoming message
229 Returns: FALSE if there isn't enough space, or if the information cannot
231 TRUE if no check was done or there is enough space
235 receive_check_fs(int msg_size)
239 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
241 space = receive_statvfs(TRUE, &inodes);
244 debug_printf("spool directory space = %dK inodes = %d "
245 "check_space = %dK inodes = %d msg_size = %d\n",
246 space, inodes, check_spool_space, check_spool_inodes, msg_size);
248 if ((space >= 0 && space < check_spool_space) ||
249 (inodes >= 0 && inodes < check_spool_inodes))
251 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
252 "inodes=%d", space, inodes);
257 if (check_log_space > 0 || check_log_inodes > 0)
259 space = receive_statvfs(FALSE, &inodes);
262 debug_printf("log directory space = %dK inodes = %d "
263 "check_space = %dK inodes = %d\n",
264 space, inodes, check_log_space, check_log_inodes);
266 if ((space >= 0 && space < check_log_space) ||
267 (inodes >= 0 && inodes < check_log_inodes))
269 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
270 "inodes=%d", space, inodes);
280 /*************************************************
281 * Bomb out while reading a message *
282 *************************************************/
284 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
285 received, or if there is a timeout. A rarer case might be if the log files are
286 screwed up and Exim can't open them to record a message's arrival. Handling
287 that case is done by setting a flag to cause the log functions to call this
288 function if there is an ultimate disaster. That is why it is globally
292 reason text reason to pass to the not-quit ACL
293 msg default SMTP response to give if in an SMTP session
298 receive_bomb_out(uschar *reason, uschar *msg)
300 static BOOL already_bombing_out;
301 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
302 timeouts, if someone has something slow in their quit ACL. Since the only
303 things we should be doing are to close down cleanly ASAP, on the second
304 pass we also close down stuff that might be opened again, before bypassing
305 the ACL call and exiting. */
307 /* If spool_name is set, it contains the name of the data file that is being
308 written. Unlink it before closing so that it cannot be picked up by a delivery
309 process. Ensure that any header file is also removed. */
311 if (spool_name[0] != '\0')
314 spool_name[Ustrlen(spool_name) - 1] = 'H';
316 spool_name[0] = '\0';
319 /* Now close the file if it is open, either as a fd or a stream. */
321 if (data_file != NULL)
323 (void)fclose(data_file);
325 } else if (data_fd >= 0) {
326 (void)close(data_fd);
330 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
331 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
334 if (!already_bombing_out)
336 already_bombing_out = TRUE;
339 if (smtp_batched_input)
340 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
341 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
342 smtp_active_hostname, msg);
346 /* Exit from the program (non-BSMTP cases) */
348 exim_exit(EXIT_FAILURE);
352 /*************************************************
353 * Data read timeout *
354 *************************************************/
356 /* Handler function for timeouts that occur while reading the data that
359 Argument: the signal number
364 data_timeout_handler(int sig)
368 sig = sig; /* Keep picky compilers happy */
372 msg = US"SMTP incoming data timeout";
373 log_write(L_lost_incoming_connection,
374 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
376 (sender_fullhost != NULL)? sender_fullhost : US"local process",
381 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
382 log_write(L_lost_incoming_connection,
383 LOG_MAIN, "timed out while reading local message");
386 receive_bomb_out(US"data-timeout", msg); /* Does not return */
391 /*************************************************
392 * local_scan() timeout *
393 *************************************************/
395 /* Handler function for timeouts that occur while running a local_scan()
398 Argument: the signal number
403 local_scan_timeout_handler(int sig)
405 sig = sig; /* Keep picky compilers happy */
406 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
407 "message temporarily rejected (size %d)", message_size);
408 /* Does not return */
409 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
414 /*************************************************
415 * local_scan() crashed *
416 *************************************************/
418 /* Handler function for signals that occur while running a local_scan()
421 Argument: the signal number
426 local_scan_crash_handler(int sig)
428 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
429 "signal %d - message temporarily rejected (size %d)", sig, message_size);
430 /* Does not return */
431 receive_bomb_out(US"local-scan-error", US"local verification problem");
435 /*************************************************
436 * SIGTERM or SIGINT received *
437 *************************************************/
439 /* Handler for SIGTERM or SIGINT signals that occur while reading the
440 data that comprises a message.
442 Argument: the signal number
447 data_sigterm_sigint_handler(int sig)
453 msg = US"Service not available - SIGTERM or SIGINT received";
454 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
455 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
459 if (filter_test == FTEST_NONE)
461 fprintf(stderr, "\nexim: %s received - message abandoned\n",
462 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
463 log_write(0, LOG_MAIN, "%s received while reading local message",
464 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
468 receive_bomb_out(US"signal-exit", msg); /* Does not return */
473 /*************************************************
474 * Add new recipient to list *
475 *************************************************/
477 /* This function builds a list of recipient addresses in argc/argv
481 recipient the next address to add to recipients_list
482 pno parent number for fixed aliases; -1 otherwise
488 receive_add_recipient(uschar *recipient, int pno)
490 if (recipients_count >= recipients_list_max)
492 recipient_item *oldlist = recipients_list;
493 int oldmax = recipients_list_max;
494 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
495 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
497 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
500 recipients_list[recipients_count].address = recipient;
501 recipients_list[recipients_count].pno = pno;
502 #ifdef EXPERIMENTAL_BRIGHTMAIL
503 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
504 /* reset optin string pointer for next recipient */
505 bmi_current_optin = NULL;
507 recipients_list[recipients_count].orcpt = NULL;
508 recipients_list[recipients_count].dsn_flags = 0;
509 recipients_list[recipients_count++].errors_to = NULL;
515 /*************************************************
516 * Send user response message *
517 *************************************************/
519 /* This function is passed a default response code and a user message. It calls
520 smtp_message_code() to check and possibly modify the response code, and then
521 calls smtp_respond() to transmit the response. I put this into a function
522 just to avoid a lot of repetition.
525 code the response code
526 user_msg the user message
533 smtp_user_msg(uschar *code, uschar *user_msg)
536 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
537 smtp_respond(code, len, TRUE, user_msg);
545 /*************************************************
546 * Remove a recipient from the list *
547 *************************************************/
549 /* This function is provided for local_scan() to use.
552 recipient address to remove
554 Returns: TRUE if it did remove something; FALSE otherwise
558 receive_remove_recipient(uschar *recipient)
561 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
563 for (count = 0; count < recipients_count; count++)
565 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
567 if ((--recipients_count - count) > 0)
568 memmove(recipients_list + count, recipients_list + count + 1,
569 (recipients_count - count)*sizeof(recipient_item));
580 /*************************************************
581 * Read data portion of a non-SMTP message *
582 *************************************************/
584 /* This function is called to read the remainder of a message (following the
585 header) when the input is not from SMTP - we are receiving a local message on
586 a standard input stream. The message is always terminated by EOF, and is also
587 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
588 two cases for maximum efficiency.
590 Ensure that the body ends with a newline. This will naturally be the case when
591 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
592 as "sequences of lines" - this of course strictly applies only to SMTP, but
593 deliveries into BSD-type mailbox files also require it. Exim used to have a
594 flag for doing this at delivery time, but as it was always set for all
595 transports, I decided to simplify things by putting the check here instead.
597 There is at least one MUA (dtmail) that sends CRLF via this interface, and
598 other programs are known to do this as well. Exim used to have a option for
599 dealing with this: in July 2003, after much discussion, the code has been
600 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
602 However, for the case when a dot on a line by itself terminates a message, the
603 only recognized terminating sequences before and after the dot are LF and CRLF.
604 Otherwise, having read EOL . CR, you don't know whether to read another
607 Internally, in messages stored in Exim's spool files, LF is used as the line
608 terminator. Under the new regime, bare CRs will no longer appear in these
612 fout a FILE to which to write the message
614 Returns: One of the END_xxx values indicating why it stopped reading
618 read_message_data(FILE *fout)
622 register int linelength = 0;
624 /* Handle the case when only EOF terminates the message */
628 register int last_ch = '\n';
630 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
632 if (ch == 0) body_zerocount++;
633 if (last_ch == '\r' && ch != '\n')
635 if (linelength > max_received_linelength)
636 max_received_linelength = linelength;
638 if (fputc('\n', fout) == EOF) return END_WERROR;
642 if (ch == '\r') continue;
644 if (fputc(ch, fout) == EOF) return END_WERROR;
647 if (linelength > max_received_linelength)
648 max_received_linelength = linelength;
653 if (++message_size > thismessage_size_limit) return END_SIZE;
658 if (linelength > max_received_linelength)
659 max_received_linelength = linelength;
660 if (fputc('\n', fout) == EOF) return END_WERROR;
668 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
672 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
674 if (ch == 0) body_zerocount++;
677 case 0: /* Normal state (previous char written) */
681 if (linelength > max_received_linelength)
682 max_received_linelength = linelength;
687 { ch_state = 2; continue; }
690 case 1: /* After written "\n" */
691 if (ch == '.') { ch_state = 3; continue; }
692 if (ch == '\r') { ch_state = 2; continue; }
693 if (ch == '\n') { body_linecount++; linelength = -1; }
698 body_linecount++; /* After unwritten "\r" */
699 if (linelength > max_received_linelength)
700 max_received_linelength = linelength;
708 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
709 if (ch == '\r') continue;
715 case 3: /* After "\n." (\n written, dot not) */
716 if (ch == '\n') return END_DOT;
717 if (ch == '\r') { ch_state = 4; continue; }
720 if (fputc('.', fout) == EOF) return END_WERROR;
724 case 4: /* After "\n.\r" (\n written, rest not) */
725 if (ch == '\n') return END_DOT;
728 if (fputs(".\n", fout) == EOF) return END_WERROR;
729 if (ch == '\r') { ch_state = 2; continue; }
735 if (fputc(ch, fout) == EOF) return END_WERROR;
736 if (++message_size > thismessage_size_limit) return END_SIZE;
739 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
740 the message ends with a newline, and we must also write any characters that
741 were saved up while testing for an ending dot. */
745 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
746 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
747 message_size += Ustrlen(ends[ch_state]);
757 /*************************************************
758 * Read data portion of an SMTP message *
759 *************************************************/
761 /* This function is called to read the remainder of an SMTP message (after the
762 headers), or to skip over it when an error has occurred. In this case, the
763 output file is passed as NULL.
765 If any line begins with a dot, that character is skipped. The input should only
766 be successfully terminated by CR LF . CR LF unless it is local (non-network)
767 SMTP, in which case the CRs are optional, but...
769 FUDGE: It seems that sites on the net send out messages with just LF
770 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
771 we make the CRs optional in all cases.
773 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
774 well, so that there are no CRs in spooled messages. However, the message
775 terminating dot is not recognized between two bare CRs.
778 fout a FILE to which to write the message; NULL if skipping
780 Returns: One of the END_xxx values indicating why it stopped reading
784 read_message_data_smtp(FILE *fout)
790 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
792 if (ch == 0) body_zerocount++;
795 case 0: /* After LF or CRLF */
799 continue; /* Don't ever write . after LF */
803 /* Else fall through to handle as normal uschar. */
805 case 1: /* Normal state */
810 if (linelength > max_received_linelength)
811 max_received_linelength = linelength;
821 case 2: /* After (unwritten) CR */
823 if (linelength > max_received_linelength)
824 max_received_linelength = linelength;
833 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
834 (void) cutthrough_put_nl();
835 if (ch != '\r') ch_state = 1; else continue;
839 case 3: /* After [CR] LF . */
847 /* The dot was removed at state 3. For a doubled dot, here, reinstate
848 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
849 and to file below. */
853 (void) cutthrough_puts(&c, 1);
858 case 4: /* After [CR] LF . CR */
859 if (ch == '\n') return END_DOT;
862 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
863 (void) cutthrough_put_nl();
873 /* Add the character to the spool file, unless skipping; then loop for the
880 if (fputc(ch, fout) == EOF) return END_WERROR;
881 if (message_size > thismessage_size_limit) return END_SIZE;
884 (void) cutthrough_put_nl();
888 (void) cutthrough_puts(&c, 1);
892 /* Fall through here if EOF encountered. This indicates some kind of error,
893 since a correct message is terminated by [CR] LF . [CR] LF. */
901 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
902 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
903 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
904 body_linecount accounting for proper re-expansion for the wire, so use
905 a cut-down version of the state-machine above; we don't need to do leading-dot
906 detection and unstuffing.
909 fout a FILE to which to write the message; NULL if skipping
911 Returns: One of the END_xxx values indicating why it stopped reading
915 read_message_bdat_smtp(FILE *fout)
917 int linelength = 0, ch;
918 enum CH_STATE ch_state = LF_SEEN;
923 switch ((ch = (bdat_getc)(GETC_BUFFER_UNLIMITED)))
925 case EOF: return END_EOF;
926 case ERR: return END_PROTOCOL;
928 /* Nothing to get from the sender anymore. We check the last
929 character written to the spool.
931 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
932 If we would be strict, we would refuse such broken messages.
933 But we are liberal, so we fix it. It would be easy just to append
934 the "\n" to the spool.
936 But there are some more things (line counting, message size calculation and such),
937 that would need to be duplicated here. So we simply do some ungetc
940 fseek(fout, -1, SEEK_CUR);
941 if (fgetc(fout) == '\n') return END_DOT;
943 if (linelength == -1) /* \r already seen (see below) */
945 DEBUG(D_receive) debug_printf("Add missing LF\n");
949 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
950 bdat_ungetc('\r'); /* not even \r was seen */
954 case '\0': body_zerocount++; break;
958 case LF_SEEN: /* After LF or CRLF */
960 /* fall through to handle as normal uschar. */
962 case MID_LINE: /* Mid-line state */
967 if (linelength > max_received_linelength)
968 max_received_linelength = linelength;
974 if (fix_nl) bdat_ungetc('\n');
975 continue; /* don't write CR */
979 case CR_SEEN: /* After (unwritten) CR */
981 if (linelength > max_received_linelength)
982 max_received_linelength = linelength;
989 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
990 (void) cutthrough_put_nl();
991 if (ch == '\r') continue; /* don't write CR */
997 /* Add the character to the spool file, unless skipping */
1003 if (fputc(ch, fout) == EOF) return END_WERROR;
1004 if (message_size > thismessage_size_limit) return END_SIZE;
1007 (void) cutthrough_put_nl();
1011 (void) cutthrough_puts(&c, 1);
1020 /*************************************************
1021 * Swallow SMTP message *
1022 *************************************************/
1024 /* This function is called when there has been some kind of error while reading
1025 an SMTP message, and the remaining data may need to be swallowed. It is global
1026 because it is called from smtp_closedown() to shut down an incoming call
1029 Argument: a FILE from which to read the message
1034 receive_swallow_smtp(void)
1036 /*XXX CHUNKING: not enough. read chunks until RSET? */
1037 if (message_ended >= END_NOTENDED)
1038 message_ended = read_message_data_smtp(NULL);
1043 /*************************************************
1044 * Handle lost SMTP connection *
1045 *************************************************/
1047 /* This function logs connection loss incidents and generates an appropriate
1050 Argument: additional data for the message
1051 Returns: the SMTP response
1055 handle_lost_connection(uschar *s)
1057 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1058 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1059 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1060 return US"421 Lost incoming connection";
1066 /*************************************************
1067 * Handle a non-smtp reception error *
1068 *************************************************/
1070 /* This function is called for various errors during the reception of non-SMTP
1071 messages. It either sends a message to the sender of the problem message, or it
1072 writes to the standard error stream.
1075 errcode code for moan_to_sender(), identifying the error
1076 text1 first message text, passed to moan_to_sender()
1077 text2 second message text, used only for stderrr
1078 error_rc code to pass to exim_exit if no problem
1079 f FILE containing body of message (may be stdin)
1080 hptr pointer to instore headers or NULL
1082 Returns: calls exim_exit(), which does not return
1086 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1087 FILE *f, header_line *hptr)
1089 if (error_handling == ERRORS_SENDER)
1093 eblock.text1 = text1;
1094 eblock.text2 = US"";
1095 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1096 error_rc = EXIT_FAILURE;
1099 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1101 exim_exit(error_rc);
1106 /*************************************************
1107 * Add header lines set up by ACL *
1108 *************************************************/
1110 /* This function is called to add the header lines that were set up by
1111 statements in an ACL to the list of headers in memory. It is done in two stages
1112 like this, because when the ACL for RCPT is running, the other headers have not
1113 yet been received. This function is called twice; once just before running the
1114 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1115 are visible to the DATA ACL.
1117 Originally these header lines were added at the end. Now there is support for
1118 three different places: top, bottom, and after the Received: header(s). There
1119 will always be at least one Received: header, even if it is marked deleted, and
1120 even if something else has been put in front of it.
1123 acl_name text to identify which ACL
1129 add_acl_headers(int where, uschar *acl_name)
1131 header_line *h, *next;
1132 header_line *last_received = NULL;
1136 case ACL_WHERE_DKIM:
1137 case ACL_WHERE_MIME:
1138 case ACL_WHERE_DATA:
1139 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1141 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1142 " will not take effect on cutthrough deliveries");
1147 if (acl_removed_headers != NULL)
1149 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1151 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1153 const uschar * list = acl_removed_headers;
1154 int sep = ':'; /* This is specified as a colon-separated list */
1158 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1159 if (header_testname(h, s, Ustrlen(s), FALSE))
1161 h->type = htype_old;
1162 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1165 acl_removed_headers = NULL;
1166 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1169 if (acl_added_headers == NULL) return;
1170 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1172 for (h = acl_added_headers; h != NULL; h = next)
1179 h->next = header_list;
1181 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1185 if (last_received == NULL)
1187 last_received = header_list;
1188 while (!header_testname(last_received, US"Received", 8, FALSE))
1189 last_received = last_received->next;
1190 while (last_received->next != NULL &&
1191 header_testname(last_received->next, US"Received", 8, FALSE))
1192 last_received = last_received->next;
1194 h->next = last_received->next;
1195 last_received->next = h;
1196 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1200 /* add header before any header which is NOT Received: or Resent- */
1201 last_received = header_list;
1202 while ( (last_received->next != NULL) &&
1203 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1204 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1205 last_received = last_received->next;
1206 /* last_received now points to the last Received: or Resent-* header
1207 in an uninterrupted chain of those header types (seen from the beginning
1208 of all headers. Our current header must follow it. */
1209 h->next = last_received->next;
1210 last_received->next = h;
1211 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1216 header_last->next = h;
1220 if (h->next == NULL) header_last = h;
1222 /* Check for one of the known header types (From:, To:, etc.) though in
1223 practice most added headers are going to be "other". Lower case
1224 identification letters are never stored with the header; they are used
1225 for existence tests when messages are received. So discard any lower case
1228 h->type = header_checkname(h, FALSE);
1229 if (h->type >= 'a') h->type = htype_other;
1231 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", header_last->text);
1234 acl_added_headers = NULL;
1235 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1240 /*************************************************
1241 * Add host information for log line *
1242 *************************************************/
1244 /* Called for acceptance and rejecting log lines. This adds information about
1245 the calling host to a string that is being built dynamically.
1248 s the dynamic string
1249 sizeptr points to the size variable
1250 ptrptr points to the pointer variable
1252 Returns: the extended string
1256 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1258 if (sender_fullhost)
1260 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1261 s = string_cat(s, sizeptr, ptrptr, US" DS");
1262 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1263 if (LOGGING(incoming_interface) && interface_address != NULL)
1265 s = string_cat(s, sizeptr, ptrptr,
1266 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1269 if (sender_ident != NULL)
1270 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1271 if (received_protocol != NULL)
1272 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1278 #ifdef WITH_CONTENT_SCAN
1280 /*************************************************
1281 * Run the MIME ACL on a message *
1282 *************************************************/
1284 /* This code is in a subroutine so that it can be used for both SMTP
1285 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1288 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1289 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1290 smtp_reply_ptr Where SMTP reply is being built
1291 blackholed_by_ptr Where "blackholed by" message is being built
1293 Returns: TRUE to carry on; FALSE to abandon the message
1297 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1298 uschar **blackholed_by_ptr)
1301 uschar rfc822_file_path[2048];
1302 unsigned long mbox_size;
1303 header_line *my_headerlist;
1304 uschar *user_msg, *log_msg;
1305 int mime_part_count_buffer = -1;
1308 memset(CS rfc822_file_path,0,2048);
1310 /* check if it is a MIME message */
1311 my_headerlist = header_list;
1312 while (my_headerlist != NULL)
1314 /* skip deleted headers */
1315 if (my_headerlist->type == '*')
1317 my_headerlist = my_headerlist->next;
1320 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1322 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1325 my_headerlist = my_headerlist->next;
1328 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1332 /* make sure the eml mbox file is spooled up */
1333 mbox_file = spool_mbox(&mbox_size, NULL);
1334 if (mbox_file == NULL) {
1335 /* error while spooling */
1336 log_write(0, LOG_MAIN|LOG_PANIC,
1337 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1338 Uunlink(spool_name);
1340 #ifdef EXPERIMENTAL_DCC
1343 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1344 message_id[0] = 0; /* Indicate no message accepted */
1345 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1346 return FALSE; /* Indicate skip to end of receive function */
1352 mime_part_count = -1;
1353 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1354 (void)fclose(mbox_file);
1356 if (Ustrlen(rfc822_file_path) > 0)
1358 mime_part_count = mime_part_count_buffer;
1360 if (unlink(CS rfc822_file_path) == -1)
1362 log_write(0, LOG_PANIC,
1363 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1368 /* check if we must check any message/rfc822 attachments */
1371 uschar temp_path[1024];
1372 struct dirent * entry;
1375 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1376 spool_directory, message_id);
1378 tempdir = opendir(CS temp_path);
1381 if (!(entry = readdir(tempdir)))
1383 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1385 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1386 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1387 DEBUG(D_receive) debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1396 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1398 /* set RFC822 expansion variable */
1400 mime_part_count_buffer = mime_part_count;
1401 goto MIME_ACL_CHECK;
1403 log_write(0, LOG_PANIC,
1404 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1405 unlink(CS rfc822_file_path);
1410 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1413 recipients_count = 0;
1414 *blackholed_by_ptr = US"MIME ACL";
1418 Uunlink(spool_name);
1420 #ifdef EXPERIMENTAL_DCC
1424 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1426 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1427 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1429 message_id[0] = 0; /* Indicate no message accepted */
1430 return FALSE; /* Cause skip to end of receive function */
1436 #endif /* WITH_CONTENT_SCAN */
1441 received_header_gen(void)
1445 header_line *received_header= header_list;
1447 timestamp = expand_string(US"${tod_full}");
1448 if (recipients_count == 1) received_for = recipients_list[0].address;
1449 received = expand_string(received_header_text);
1450 received_for = NULL;
1454 if(spool_name[0] != 0)
1455 Uunlink(spool_name); /* Lose the data file */
1456 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1457 "(received_header_text) failed: %s", string_printing(received_header_text),
1458 expand_string_message);
1461 /* The first element on the header chain is reserved for the Received header,
1462 so all we have to do is fill in the text pointer, and set the type. However, if
1463 the result of the expansion is an empty string, we leave the header marked as
1464 "old" so as to refrain from adding a Received header. */
1466 if (received[0] == 0)
1468 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1469 received_header->type = htype_old;
1473 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1474 received_header->type = htype_received;
1477 received_header->slen = Ustrlen(received_header->text);
1479 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1480 received_header->type, received_header->text);
1485 /*************************************************
1487 *************************************************/
1489 /* Receive a message on the given input, and put it into a pair of spool files.
1490 Either a non-null list of recipients, or the extract flag will be true, or
1491 both. The flag sender_local is true for locally generated messages. The flag
1492 submission_mode is true if an ACL has obeyed "control = submission". The flag
1493 suppress_local_fixups is true if an ACL has obeyed "control =
1494 suppress_local_fixups" or -G was passed on the command-line.
1495 The flag smtp_input is true if the message is to be
1496 handled using SMTP conventions about termination and lines starting with dots.
1497 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1499 If a message was successfully read, message_id[0] will be non-zero.
1501 The general actions of this function are:
1503 . Read the headers of the message (if any) into a chain of store
1506 . If there is a "sender:" header and the message is locally originated,
1507 throw it away, unless the caller is trusted, or unless
1508 active_local_sender_retain is set - which can only happen if
1509 active_local_from_check is false.
1511 . If recipients are to be extracted from the message, build the
1512 recipients list from the headers, removing any that were on the
1513 original recipients list (unless extract_addresses_remove_arguments is
1514 false), and at the same time, remove any bcc header that may be present.
1516 . Get the spool file for the data, sort out its unique name, open
1517 and lock it (but don't give it the name yet).
1519 . Generate a "Message-Id" header if the message doesn't have one, for
1520 locally-originated messages.
1522 . Generate a "Received" header.
1524 . Ensure the recipients list is fully qualified and rewritten if necessary.
1526 . If there are any rewriting rules, apply them to the sender address
1527 and also to the headers.
1529 . If there is no from: header, generate one, for locally-generated messages
1530 and messages in "submission mode" only.
1532 . If the sender is local, check that from: is correct, and if not, generate
1533 a Sender: header, unless message comes from a trusted caller, or this
1534 feature is disabled by active_local_from_check being false.
1536 . If there is no "date" header, generate one, for locally-originated
1537 or submission mode messages only.
1539 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1540 dot_ends mode, to the data file. Leave it open, to hold the lock.
1542 . Write the envelope and the headers to a new file.
1544 . Set the name for the header file; close it.
1546 . Set the name for the data file; close it.
1548 Because this function can potentially be called many times in a single
1549 SMTP connection, all store should be got by store_get(), so that it will be
1550 automatically retrieved after the message is accepted.
1552 FUDGE: It seems that sites on the net send out messages with just LF
1553 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1554 we make the CRs optional in all cases.
1556 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1557 new regime is now in place in which bare CRs in header lines are turned into LF
1558 followed by a space, so as not to terminate the header line.
1560 February 2004: A bare LF in a header line in a message whose first line was
1561 terminated by CRLF is treated in the same way as a bare CR.
1564 extract_recip TRUE if recipients are to be extracted from the message's
1567 Returns: TRUE there are more messages to be read (SMTP input)
1568 FALSE there are no more messages to be read (non-SMTP input
1569 or SMTP connection collapsed, or other failure)
1571 When reading a message for filter testing, the returned value indicates
1572 whether the headers (which is all that is read) were terminated by '.' or
1576 receive_msg(BOOL extract_recip)
1581 int process_info_len = Ustrlen(process_info);
1582 int error_rc = (error_handling == ERRORS_SENDER)?
1583 errors_sender_rc : EXIT_FAILURE;
1584 int header_size = 256;
1585 int start, end, domain, size, sptr;
1588 int prevlines_length = 0;
1590 register int ptr = 0;
1592 BOOL contains_resent_headers = FALSE;
1593 BOOL extracted_ignored = FALSE;
1594 BOOL first_line_ended_crlf = TRUE_UNSET;
1595 BOOL smtp_yield = TRUE;
1598 BOOL resents_exist = FALSE;
1599 uschar *resent_prefix = US"";
1600 uschar *blackholed_by = NULL;
1601 uschar *blackhole_log_msg = US"";
1602 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1605 error_block *bad_addresses = NULL;
1607 uschar *frozen_by = NULL;
1608 uschar *queued_by = NULL;
1611 struct stat statbuf;
1613 /* Final message to give to SMTP caller, and messages from ACLs */
1615 uschar *smtp_reply = NULL;
1616 uschar *user_msg, *log_msg;
1618 /* Working header pointers */
1620 header_line *h, *next;
1622 /* Flags for noting the existence of certain headers (only one left) */
1624 BOOL date_header_exists = FALSE;
1626 /* Pointers to receive the addresses of headers whose contents we need. */
1628 header_line *from_header = NULL;
1629 header_line *subject_header = NULL;
1630 header_line *msgid_header = NULL;
1631 header_line *received_header;
1633 #ifdef EXPERIMENTAL_DMARC
1635 #endif /* EXPERIMENTAL_DMARC */
1637 /* Variables for use when building the Received: header. */
1642 /* Release any open files that might have been cached while preparing to
1643 accept the message - e.g. by verifying addresses - because reading a message
1644 might take a fair bit of real time. */
1648 /* Extracting the recipient list from an input file is incompatible with
1649 cutthrough delivery with the no-spool option. It shouldn't be possible
1650 to set up the combination, but just in case kill any ongoing connection. */
1651 if (extract_recip || !smtp_input)
1652 cancel_cutthrough_connection("not smtp input");
1654 /* Initialize the chain of headers by setting up a place-holder for Received:
1655 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1656 pointing to the end of the chain to make adding headers simple. */
1658 received_header = header_list = header_last = store_get(sizeof(header_line));
1659 header_list->next = NULL;
1660 header_list->type = htype_old;
1661 header_list->text = NULL;
1662 header_list->slen = 0;
1664 /* Control block for the next header to be read. */
1666 next = store_get(sizeof(header_line));
1667 next->text = store_get(header_size);
1669 /* Initialize message id to be null (indicating no message read), and the
1670 header names list to be the normal list. Indicate there is no data file open
1671 yet, initialize the size and warning count, and deal with no size limit. */
1679 received_count = 1; /* For the one we will add */
1681 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1683 /* While reading the message, the following counts are computed. */
1685 message_linecount = body_linecount = body_zerocount =
1686 max_received_linelength = 0;
1688 #ifndef DISABLE_DKIM
1689 /* Call into DKIM to set up the context. In CHUNKING mode
1690 we clear the dot-stuffing flag */
1691 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1692 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1695 #ifdef EXPERIMENTAL_DMARC
1696 /* initialize libopendmarc */
1697 dmarc_up = dmarc_init();
1700 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1701 ids, and fractions of a second are required. See the comments that precede the
1702 message id creation below. */
1704 (void)gettimeofday(&message_id_tv, NULL);
1706 /* For other uses of the received time we can operate with granularity of one
1707 second, and for that we use the global variable received_time. This is for
1708 things like ultimate message timeouts. */
1710 received_time = message_id_tv.tv_sec;
1712 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1713 happen in the smtp_getc() function when it refills its buffer. */
1715 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1717 /* If not SMTP input, timeout happens only if configured, and we just set a
1718 single timeout for the whole message. */
1720 else if (receive_timeout > 0)
1722 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1723 alarm(receive_timeout);
1726 /* SIGTERM and SIGINT are caught always. */
1728 signal(SIGTERM, data_sigterm_sigint_handler);
1729 signal(SIGINT, data_sigterm_sigint_handler);
1731 /* Header lines in messages are not supposed to be very long, though when
1732 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1733 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1734 storing the header, and extend this as necessary using string_cat().
1736 To cope with total lunacies, impose an upper limit on the length of the header
1737 section of the message, as otherwise the store will fill up. We must also cope
1738 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1739 Folded header lines are joined into one string, leaving the '\n' characters
1740 inside them, so that writing them out reproduces the input.
1742 Loop for each character of each header; the next structure for chaining the
1743 header is set up already, with ptr the offset of the next character in
1748 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1750 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1751 SMTP must have a correct "." terminator. */
1753 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1755 smtp_reply = handle_lost_connection(US" (header)");
1757 goto TIDYUP; /* Skip to end of function */
1760 /* See if we are at the current header's size limit - there must be at least
1761 four bytes left. This allows for the new character plus a zero, plus two for
1762 extra insertions when we are playing games with dots and carriage returns. If
1763 we are at the limit, extend the text buffer. This could have been done
1764 automatically using string_cat() but because this is a tightish loop storing
1765 only one character at a time, we choose to do it inline. Normally
1766 store_extend() will be able to extend the block; only at the end of a big
1767 store block will a copy be needed. To handle the case of very long headers
1768 (and sometimes lunatic messages can have ones that are 100s of K long) we
1769 call store_release() for strings that have been copied - if the string is at
1770 the start of a block (and therefore the only thing in it, because we aren't
1771 doing any other gets), the block gets freed. We can only do this because we
1772 know there are no other calls to store_get() going on. */
1774 if (ptr >= header_size - 4)
1776 int oldsize = header_size;
1777 /* header_size += 256; */
1779 if (!store_extend(next->text, oldsize, header_size))
1781 uschar *newtext = store_get(header_size);
1782 memcpy(newtext, next->text, ptr);
1783 store_release(next->text);
1784 next->text = newtext;
1788 /* Cope with receiving a binary zero. There is dispute about whether
1789 these should be allowed in RFC 822 messages. The middle view is that they
1790 should not be allowed in headers, at least. Exim takes this attitude at
1791 the moment. We can't just stomp on them here, because we don't know that
1792 this line is a header yet. Set a flag to cause scanning later. */
1794 if (ch == 0) had_zero++;
1796 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1797 those from data files use just LF. Treat LF in local SMTP input as a
1798 terminator too. Treat EOF as a line terminator always. */
1800 if (ch == EOF) goto EOL;
1802 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1803 other MTAs accept this. We are therefore forced into this "liberalisation"
1804 too, so we accept LF as a line terminator whatever the source of the message.
1805 However, if the first line of the message ended with a CRLF, we treat a bare
1806 LF specially by inserting a white space after it to ensure that the header
1807 line is not terminated. */
1811 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1812 else if (first_line_ended_crlf) receive_ungetc(' ');
1816 /* This is not the end of the line. If this is SMTP input and this is
1817 the first character in the line and it is a "." character, ignore it.
1818 This implements the dot-doubling rule, though header lines starting with
1819 dots aren't exactly common. They are legal in RFC 822, though. If the
1820 following is CRLF or LF, this is the line that that terminates the
1821 entire message. We set message_ended to indicate this has happened (to
1822 prevent further reading), and break out of the loop, having freed the
1823 empty header, and set next = NULL to indicate no data line. */
1825 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1827 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1830 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1834 ch = '\r'; /* Revert to CR */
1839 message_ended = END_DOT;
1842 break; /* End character-reading loop */
1845 /* For non-SMTP input, the dot at the start of the line was really a data
1846 character. What is now in ch is the following character. We guaranteed
1847 enough space for this above. */
1851 next->text[ptr++] = '.';
1856 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1857 remember this case if this is the first line ending. */
1861 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1864 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1868 /* Otherwise, put back the character after CR, and turn the bare CR
1871 ch = (receive_ungetc)(ch);
1872 next->text[ptr++] = '\n';
1877 /* We have a data character for the header line. */
1879 next->text[ptr++] = ch; /* Add to buffer */
1880 message_size++; /* Total message size so far */
1882 /* Handle failure due to a humungously long header section. The >= allows
1883 for the terminating \n. Add what we have so far onto the headers list so
1884 that it gets reflected in any error message, and back up the just-read
1887 if (message_size >= header_maxsize)
1889 next->text[ptr] = 0;
1891 next->type = htype_other;
1893 header_last->next = next;
1896 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1897 "%s (more than %d characters): message abandoned",
1898 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1902 smtp_reply = US"552 Message header is ridiculously long";
1903 receive_swallow_smtp();
1904 goto TIDYUP; /* Skip to end of function */
1909 give_local_error(ERRMESS_VLONGHEADER,
1910 string_sprintf("message header longer than %d characters received: "
1911 "message not accepted", header_maxsize), US"", error_rc, stdin,
1913 /* Does not return */
1917 continue; /* With next input character */
1919 /* End of header line reached */
1923 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1925 receive_linecount++;
1926 message_linecount++;
1928 /* Keep track of maximum line length */
1930 if (ptr - prevlines_length > max_received_linelength)
1931 max_received_linelength = ptr - prevlines_length;
1932 prevlines_length = ptr + 1;
1934 /* Now put in the terminating newline. There is always space for
1935 at least two more characters. */
1937 next->text[ptr++] = '\n';
1940 /* A blank line signals the end of the headers; release the unwanted
1941 space and set next to NULL to indicate this. */
1950 /* There is data in the line; see if the next input character is a
1951 whitespace character. If it is, we have a continuation of this header line.
1952 There is always space for at least one character at this point. */
1956 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1957 if (nextch == ' ' || nextch == '\t')
1959 next->text[ptr++] = nextch;
1961 continue; /* Iterate the loop */
1963 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1964 else ch = EOF; /* Cause main loop to exit at end */
1967 /* We have got to the real line end. Terminate the string and release store
1968 beyond it. If it turns out to be a real header, internal binary zeros will
1969 be squashed later. */
1971 next->text[ptr] = 0;
1973 store_reset(next->text + ptr + 1);
1975 /* Check the running total size against the overall message size limit. We
1976 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1977 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1978 headers - the code to read the body will then also hit the buffer. */
1980 if (message_size > thismessage_size_limit) break;
1982 /* A line that is not syntactically correct for a header also marks
1983 the end of the headers. In this case, we leave next containing the
1984 first data line. This might actually be several lines because of the
1985 continuation logic applied above, but that doesn't matter.
1987 It turns out that smail, and presumably sendmail, accept leading lines
1990 From ph10 Fri Jan 5 12:35 GMT 1996
1992 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1993 find any documentation of this, but for compatibility it had better be
1994 accepted. Exim restricts it to the case of non-smtp messages, and
1995 treats it as an alternative to the -f command line option. Thus it is
1996 ignored except for trusted users or filter testing. Otherwise it is taken
1997 as the sender address, unless -f was used (sendmail compatibility).
1999 It further turns out that some UUCPs generate the From_line in a different
2002 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2004 The regex for matching these things is now capable of recognizing both
2005 formats (including 2- and 4-digit years in the latter). In fact, the regex
2006 is now configurable, as is the expansion string to fish out the sender.
2008 Even further on it has been discovered that some broken clients send
2009 these lines in SMTP messages. There is now an option to ignore them from
2010 specified hosts or networks. Sigh. */
2012 if (header_last == header_list &&
2015 (sender_host_address != NULL &&
2016 verify_check_host(&ignore_fromline_hosts) == OK)
2018 (sender_host_address == NULL && ignore_fromline_local)
2020 regex_match_and_setup(regex_From, next->text, 0, -1))
2022 if (!sender_address_forced)
2024 uschar *uucp_sender = expand_string(uucp_from_sender);
2025 if (uucp_sender == NULL)
2027 log_write(0, LOG_MAIN|LOG_PANIC,
2028 "expansion of \"%s\" failed after matching "
2029 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2033 int start, end, domain;
2035 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2036 &start, &end, &domain, TRUE);
2037 if (newsender != NULL)
2039 if (domain == 0 && newsender[0] != 0)
2040 newsender = rewrite_address_qualify(newsender, FALSE);
2042 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2044 sender_address = newsender;
2046 if (trusted_caller || filter_test != FTEST_NONE)
2048 authenticated_sender = NULL;
2049 originator_name = US"";
2050 sender_local = FALSE;
2053 if (filter_test != FTEST_NONE)
2054 printf("Sender taken from \"From \" line\n");
2061 /* Not a leading "From " line. Check to see if it is a valid header line.
2062 Header names may contain any non-control characters except space and colon,
2067 uschar *p = next->text;
2069 /* If not a valid header line, break from the header reading loop, leaving
2070 next != NULL, indicating that it holds the first line of the body. */
2072 if (isspace(*p)) break;
2073 while (mac_isgraph(*p) && *p != ':') p++;
2074 while (isspace(*p)) p++;
2077 body_zerocount = had_zero;
2081 /* We have a valid header line. If there were any binary zeroes in
2082 the line, stomp on them here. */
2085 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2087 /* It is perfectly legal to have an empty continuation line
2088 at the end of a header, but it is confusing to humans
2089 looking at such messages, since it looks like a blank line.
2090 Reduce confusion by removing redundant white space at the
2091 end. We know that there is at least one printing character
2092 (the ':' tested for above) so there is no danger of running
2095 p = next->text + ptr - 2;
2098 while (*p == ' ' || *p == '\t') p--;
2099 if (*p != '\n') break;
2100 ptr = (p--) - next->text + 1;
2101 message_size -= next->slen - ptr;
2102 next->text[ptr] = 0;
2106 /* Add the header to the chain */
2108 next->type = htype_other;
2110 header_last->next = next;
2113 /* Check the limit for individual line lengths. This comes after adding to
2114 the chain so that the failing line is reflected if a bounce is generated
2115 (for a local message). */
2117 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2119 log_write(0, LOG_MAIN, "overlong message header line received from "
2120 "%s (more than %d characters): message abandoned",
2121 sender_host_unknown? sender_ident : sender_fullhost,
2122 header_line_maxsize);
2126 smtp_reply = US"552 A message header line is too long";
2127 receive_swallow_smtp();
2128 goto TIDYUP; /* Skip to end of function */
2133 give_local_error(ERRMESS_VLONGHDRLINE,
2134 string_sprintf("message header line longer than %d characters "
2135 "received: message not accepted", header_line_maxsize), US"",
2136 error_rc, stdin, header_list->next);
2137 /* Does not return */
2141 /* Note if any resent- fields exist. */
2143 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2145 resents_exist = TRUE;
2146 resent_prefix = US"Resent-";
2150 /* Reject CHUNKING messages that do not CRLF their first header line */
2152 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2154 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2155 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2157 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2158 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2159 smtp_printf("552 Message header not CRLF terminated\r\n");
2162 goto TIDYUP; /* Skip to end of function */
2165 /* The line has been handled. If we have hit EOF, break out of the loop,
2166 indicating no pending data line. */
2168 if (ch == EOF) { next = NULL; break; }
2170 /* Set up for the next header */
2173 next = store_get(sizeof(header_line));
2174 next->text = store_get(header_size);
2177 prevlines_length = 0;
2178 } /* Continue, starting to read the next header */
2180 /* At this point, we have read all the headers into a data structure in main
2181 store. The first header is still the dummy placeholder for the Received: header
2182 we are going to generate a bit later on. If next != NULL, it contains the first
2183 data line - which terminated the headers before reaching a blank line (not the
2188 debug_printf(">>Headers received:\n");
2189 for (h = header_list->next; h; h = h->next)
2190 debug_printf("%s", h->text);
2194 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2195 is dropped immediately after valid headers, the next thing we will see is EOF.
2196 We must test for this specially, as further down the reading of the data is
2197 skipped if already at EOF. */
2199 if (smtp_input && (receive_feof)())
2201 smtp_reply = handle_lost_connection(US" (after header)");
2203 goto TIDYUP; /* Skip to end of function */
2206 /* If this is a filter test run and no headers were read, output a warning
2207 in case there is a mistake in the test message. */
2209 if (filter_test != FTEST_NONE && header_list->next == NULL)
2210 printf("Warning: no message headers read\n");
2213 /* Scan the headers to identify them. Some are merely marked for later
2214 processing; some are dealt with here. */
2216 for (h = header_list->next; h; h = h->next)
2218 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2219 if (is_resent) contains_resent_headers = TRUE;
2221 switch (header_checkname(h, is_resent))
2224 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2228 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2231 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2234 if (!resents_exist || is_resent) date_header_exists = TRUE;
2237 /* Same comments as about Return-Path: below. */
2239 case htype_delivery_date:
2240 if (delivery_date_remove) h->type = htype_old;
2243 /* Same comments as about Return-Path: below. */
2245 case htype_envelope_to:
2246 if (envelope_to_remove) h->type = htype_old;
2249 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2250 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2251 header consists of just the login id of the user who called Exim, rewrite
2252 it with the gecos field first. Apply this rule to Resent-From: if there
2253 are resent- fields. */
2256 h->type = htype_from;
2257 if (!resents_exist || is_resent)
2263 uschar *s = Ustrchr(h->text, ':') + 1;
2264 while (isspace(*s)) s++;
2265 len = h->slen - (s - h->text) - 1;
2266 if (Ustrlen(originator_login) == len &&
2267 strncmpic(s, originator_login, len) == 0)
2269 uschar *name = is_resent? US"Resent-From" : US"From";
2270 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2271 originator_login, qualify_domain_sender);
2272 from_header = header_last;
2273 h->type = htype_old;
2274 DEBUG(D_receive|D_rewrite)
2275 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2281 /* Identify the Message-id: header for generating "in-reply-to" in the
2282 autoreply transport. For incoming logging, save any resent- value. In both
2283 cases, take just the first of any multiples. */
2286 if (msgid_header == NULL && (!resents_exist || is_resent))
2293 /* Flag all Received: headers */
2295 case htype_received:
2296 h->type = htype_received;
2300 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2302 case htype_reply_to:
2303 h->type = htype_reply_to;
2306 /* The Return-path: header is supposed to be added to messages when
2307 they leave the SMTP system. We shouldn't receive messages that already
2308 contain Return-path. However, since Exim generates Return-path: on
2309 local delivery, resent messages may well contain it. We therefore
2310 provide an option (which defaults on) to remove any Return-path: headers
2311 on input. Removal actually means flagging as "old", which prevents the
2312 header being transmitted with the message. */
2314 case htype_return_path:
2315 if (return_path_remove) h->type = htype_old;
2317 /* If we are testing a mail filter file, use the value of the
2318 Return-Path: header to set up the return_path variable, which is not
2319 otherwise set. However, remove any <> that surround the address
2320 because the variable doesn't have these. */
2322 if (filter_test != FTEST_NONE)
2324 uschar *start = h->text + 12;
2325 uschar *end = start + Ustrlen(start);
2326 while (isspace(*start)) start++;
2327 while (end > start && isspace(end[-1])) end--;
2328 if (*start == '<' && end[-1] == '>')
2333 return_path = string_copyn(start, end - start);
2334 printf("Return-path taken from \"Return-path:\" header line\n");
2338 /* If there is a "Sender:" header and the message is locally originated,
2339 and from an untrusted caller and suppress_local_fixups is not set, or if we
2340 are in submission mode for a remote message, mark it "old" so that it will
2341 not be transmitted with the message, unless active_local_sender_retain is
2342 set. (This can only be true if active_local_from_check is false.) If there
2343 are any resent- headers in the message, apply this rule to Resent-Sender:
2344 instead of Sender:. Messages with multiple resent- header sets cannot be
2345 tidily handled. (For this reason, at least one MUA - Pine - turns old
2346 resent- headers into X-resent- headers when resending, leaving just one
2350 h->type = ((!active_local_sender_retain &&
2352 (sender_local && !trusted_caller && !suppress_local_fixups)
2356 (!resents_exist||is_resent))?
2357 htype_old : htype_sender;
2360 /* Remember the Subject: header for logging. There is no Resent-Subject */
2366 /* "To:" gets flagged, and the existence of a recipient header is noted,
2367 whether it's resent- or not. */
2372 to_or_cc_header_exists = TRUE;
2378 /* Extract recipients from the headers if that is required (the -t option).
2379 Note that this is documented as being done *before* any address rewriting takes
2380 place. There are two possibilities:
2382 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2383 recipients already listed are to be REMOVED from the message. Smail 3 works
2384 like this. We need to build a non-recipients tree for that list, because in
2385 subsequent processing this data is held in a tree and that's what the
2386 spool_write_header() function expects. Make sure that non-recipient addresses
2387 are fully qualified and rewritten if necessary.
2389 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2390 those in the command line arguments (and it is rumoured some other MTAs do
2391 this). Therefore, there is an option to make Exim behave this way.
2393 *** Notes on "Resent-" header lines ***
2395 The presence of resent-headers in the message makes -t horribly ambiguous.
2396 Experiments with sendmail showed that it uses recipients for all resent-
2397 headers, totally ignoring the concept of "sets of resent- headers" as described
2398 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2399 with all the addresses in one instance of each header.
2401 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2402 error for -t if there were resent- headers in the message. However, after a
2403 discussion on the mailing list, I've learned that there are MUAs that use
2404 resent- headers with -t, and also that the stuff about sets of resent- headers
2405 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2406 message with -t and resent- header lines makes sure that only *its* resent-
2407 headers are present; previous ones are often renamed as X-resent- for example.
2409 Consequently, Exim has been changed so that, if any resent- header lines are
2410 present, the recipients are taken from all of the appropriate resent- lines,
2411 and not from the ordinary To:, Cc:, etc. */
2416 error_block **bnext = &bad_addresses;
2418 if (extract_addresses_remove_arguments)
2420 while (recipients_count-- > 0)
2422 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2423 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2424 tree_add_nonrecipient(s);
2426 recipients_list = NULL;
2427 recipients_count = recipients_list_max = 0;
2430 /* Now scan the headers */
2432 for (h = header_list->next; h; h = h->next)
2434 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2435 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2437 uschar *s = Ustrchr(h->text, ':') + 1;
2438 while (isspace(*s)) s++;
2440 parse_allow_group = TRUE; /* Allow address group syntax */
2444 uschar *ss = parse_find_address_end(s, FALSE);
2445 uschar *recipient, *errmess, *p, *pp;
2446 int start, end, domain;
2448 /* Check on maximum */
2450 if (recipients_max > 0 && ++rcount > recipients_max)
2452 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2453 US"message rejected: ", error_rc, stdin, NULL);
2454 /* Does not return */
2457 /* Make a copy of the address, and remove any internal newlines. These
2458 may be present as a result of continuations of the header line. The
2459 white space that follows the newline must not be removed - it is part
2462 pp = recipient = store_get(ss - s + 1);
2463 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2468 BOOL b = allow_utf8_domains;
2469 allow_utf8_domains = TRUE;
2471 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2475 if (string_is_utf8(recipient))
2476 message_smtputf8 = TRUE;
2478 allow_utf8_domains = b;
2482 /* Keep a list of all the bad addresses so we can send a single
2483 error message at the end. However, an empty address is not an error;
2484 just ignore it. This can come from an empty group list like
2486 To: Recipients of list:;
2488 If there are no recipients at all, an error will occur later. */
2490 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2492 int len = Ustrlen(s);
2493 error_block *b = store_get(sizeof(error_block));
2494 while (len > 0 && isspace(s[len-1])) len--;
2496 b->text1 = string_printing(string_copyn(s, len));
2502 /* If the recipient is already in the nonrecipients tree, it must
2503 have appeared on the command line with the option extract_addresses_
2504 remove_arguments set. Do not add it to the recipients, and keep a note
2505 that this has happened, in order to give a better error if there are
2506 no recipients left. */
2508 else if (recipient != NULL)
2510 if (tree_search(tree_nonrecipients, recipient) == NULL)
2511 receive_add_recipient(recipient, -1);
2513 extracted_ignored = TRUE;
2516 /* Move on past this address */
2518 s = ss + (*ss? 1:0);
2519 while (isspace(*s)) s++;
2520 } /* Next address */
2522 parse_allow_group = FALSE; /* Reset group syntax flags */
2523 parse_found_group = FALSE;
2525 /* If this was the bcc: header, mark it "old", which means it
2526 will be kept on the spool, but not transmitted as part of the
2529 if (h->type == htype_bcc) h->type = htype_old;
2530 } /* For appropriate header line */
2531 } /* For each header line */
2535 /* Now build the unique message id. This has changed several times over the
2536 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2537 Retaining all the history in the comment has become too unwieldy - read
2538 previous release sources if you want it.
2540 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2541 The first part is the current time, in seconds. The second part is the current
2542 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2543 can hold a number in the range 0-3843. It used to be a computed sequence
2544 number, but is now the fractional component of the current time in units of
2545 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2546 received, Exim ensures that the timer has ticked at the appropriate level
2547 before proceeding, to avoid duplication if the pid happened to be re-used
2548 within the same time period. It seems likely that most messages will take at
2549 least half a millisecond to be received, so no delay will normally be
2550 necessary. At least for some time...
2552 There is a modification when localhost_number is set. Formerly this was allowed
2553 to be as large as 255. Now it is restricted to the range 0-16, and the final
2554 component of the message id becomes (localhost_number * 200) + fractional time
2555 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2557 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2558 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2559 still allows the tttttt field to hold a large enough number to last for some
2560 more decades, and the final two-digit field can hold numbers up to 1295, which
2561 is enough for milliseconds (instead of 1/2000 of a second).
2563 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2564 pid, so it is probably safe because pids have to be positive. The
2565 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2566 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2568 Note that string_base62() returns its data in a static storage block, so it
2569 must be copied before calling string_base62() again. It always returns exactly
2572 There doesn't seem to be anything in the RFC which requires a message id to
2573 start with a letter, but Smail was changed to ensure this. The external form of
2574 the message id (as supplied by string expansion) therefore starts with an
2575 additional leading 'E'. The spool file names do not include this leading
2576 letter and it is not used internally.
2578 NOTE: If ever the format of message ids is changed, the regular expression for
2579 checking that a string is in this format must be updated in a corresponding
2580 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2581 must also be changed to reflect the correct string length. Then, of course,
2582 other programs that rely on the message id format will need updating too. */
2584 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2585 message_id[6] = '-';
2586 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2588 /* Deal with the case where the host number is set. The value of the number was
2589 checked when it was read, to ensure it isn't too big. The timing granularity is
2590 left in id_resolution so that an appropriate wait can be done after receiving
2591 the message, if necessary (we hope it won't be). */
2593 if (host_number_string != NULL)
2595 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2596 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2597 string_base62((long int)(
2598 host_number * (1000000/id_resolution) +
2599 message_id_tv.tv_usec/id_resolution)) + 4);
2602 /* Host number not set: final field is just the fractional time at an
2603 appropriate resolution. */
2607 id_resolution = (BASE_62 == 62)? 500 : 1000;
2608 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2609 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2612 /* Add the current message id onto the current process info string if
2615 (void)string_format(process_info + process_info_len,
2616 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2618 /* If we are using multiple input directories, set up the one for this message
2619 to be the least significant base-62 digit of the time of arrival. Otherwise
2620 ensure that it is an empty string. */
2622 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2624 /* Now that we have the message-id, if there is no message-id: header, generate
2625 one, but only for local (without suppress_local_fixups) or submission mode
2626 messages. This can be user-configured if required, but we had better flatten
2627 any illegal characters therein. */
2629 if (msgid_header == NULL &&
2630 ((sender_host_address == NULL && !suppress_local_fixups)
2631 || submission_mode))
2634 uschar *id_text = US"";
2635 uschar *id_domain = primary_hostname;
2637 /* Permit only letters, digits, dots, and hyphens in the domain */
2639 if (message_id_domain != NULL)
2641 uschar *new_id_domain = expand_string(message_id_domain);
2642 if (new_id_domain == NULL)
2644 if (!expand_string_forcedfail)
2645 log_write(0, LOG_MAIN|LOG_PANIC,
2646 "expansion of \"%s\" (message_id_header_domain) "
2647 "failed: %s", message_id_domain, expand_string_message);
2649 else if (*new_id_domain != 0)
2651 id_domain = new_id_domain;
2652 for (p = id_domain; *p != 0; p++)
2653 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2657 /* Permit all characters except controls and RFC 2822 specials in the
2658 additional text part. */
2660 if (message_id_text != NULL)
2662 uschar *new_id_text = expand_string(message_id_text);
2663 if (new_id_text == NULL)
2665 if (!expand_string_forcedfail)
2666 log_write(0, LOG_MAIN|LOG_PANIC,
2667 "expansion of \"%s\" (message_id_header_text) "
2668 "failed: %s", message_id_text, expand_string_message);
2670 else if (*new_id_text != 0)
2672 id_text = new_id_text;
2673 for (p = id_text; *p != 0; p++)
2674 if (mac_iscntrl_or_special(*p)) *p = '-';
2678 /* Add the header line
2679 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2680 * appended, to preserve classical expectations of header ordering. */
2682 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2683 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2684 (*id_text == 0)? "" : ".", id_text, id_domain);
2687 /* If we are to log recipients, keep a copy of the raw ones before any possible
2688 rewriting. Must copy the count, because later ACLs and the local_scan()
2689 function may mess with the real recipients. */
2691 if (LOGGING(received_recipients))
2693 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2694 for (i = 0; i < recipients_count; i++)
2695 raw_recipients[i] = string_copy(recipients_list[i].address);
2696 raw_recipients_count = recipients_count;
2699 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2700 recipients will get here only if the conditions were right (allow_unqualified_
2701 recipient is TRUE). */
2703 for (i = 0; i < recipients_count; i++)
2704 recipients_list[i].address =
2705 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2706 global_rewrite_rules, rewrite_existflags);
2708 /* If there is no From: header, generate one for local (without
2709 suppress_local_fixups) or submission_mode messages. If there is no sender
2710 address, but the sender is local or this is a local delivery error, use the
2711 originator login. This shouldn't happen for genuine bounces, but might happen
2712 for autoreplies. The addition of From: must be done *before* checking for the
2713 possible addition of a Sender: header, because untrusted_set_sender allows an
2714 untrusted user to set anything in the envelope (which might then get info
2715 From:) but we still want to ensure a valid Sender: if it is required. */
2717 if (from_header == NULL &&
2718 ((sender_host_address == NULL && !suppress_local_fixups)
2719 || submission_mode))
2721 uschar *oname = US"";
2723 /* Use the originator_name if this is a locally submitted message and the
2724 caller is not trusted. For trusted callers, use it only if -F was used to
2725 force its value or if we have a non-SMTP message for which -f was not used
2726 to set the sender. */
2728 if (sender_host_address == NULL)
2730 if (!trusted_caller || sender_name_forced ||
2731 (!smtp_input && !sender_address_forced))
2732 oname = originator_name;
2735 /* For non-locally submitted messages, the only time we use the originator
2736 name is when it was forced by the /name= option on control=submission. */
2740 if (submission_name != NULL) oname = submission_name;
2743 /* Envelope sender is empty */
2745 if (sender_address[0] == 0)
2747 uschar *fromstart, *fromend;
2749 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2750 oname, (oname[0] == 0)? "" : " <");
2751 fromend = (oname[0] == 0)? US"" : US">";
2753 if (sender_local || local_error_message)
2755 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2756 local_part_quote(originator_login), qualify_domain_sender,
2759 else if (submission_mode && authenticated_id != NULL)
2761 if (submission_domain == NULL)
2763 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2764 local_part_quote(authenticated_id), qualify_domain_sender,
2767 else if (submission_domain[0] == 0) /* empty => whole address set */
2769 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2774 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2775 local_part_quote(authenticated_id), submission_domain,
2778 from_header = header_last; /* To get it checked for Sender: */
2782 /* There is a non-null envelope sender. Build the header using the original
2783 sender address, before any rewriting that might have been done while
2788 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2790 (oname[0] == 0)? "" : " <",
2791 (sender_address_unrewritten == NULL)?
2792 sender_address : sender_address_unrewritten,
2793 (oname[0] == 0)? "" : ">");
2795 from_header = header_last; /* To get it checked for Sender: */
2800 /* If the sender is local (without suppress_local_fixups), or if we are in
2801 submission mode and there is an authenticated_id, check that an existing From:
2802 is correct, and if not, generate a Sender: header, unless disabled. Any
2803 previously-existing Sender: header was removed above. Note that sender_local,
2804 as well as being TRUE if the caller of exim is not trusted, is also true if a
2805 trusted caller did not supply a -f argument for non-smtp input. To allow
2806 trusted callers to forge From: without supplying -f, we have to test explicitly
2807 here. If the From: header contains more than one address, then the call to
2808 parse_extract_address fails, and a Sender: header is inserted, as required. */
2810 if (from_header != NULL &&
2811 (active_local_from_check &&
2812 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2813 (submission_mode && authenticated_id != NULL))
2816 BOOL make_sender = TRUE;
2817 int start, end, domain;
2819 uschar *from_address =
2820 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2821 &start, &end, &domain, FALSE);
2822 uschar *generated_sender_address;
2824 if (submission_mode)
2826 if (submission_domain == NULL)
2828 generated_sender_address = string_sprintf("%s@%s",
2829 local_part_quote(authenticated_id), qualify_domain_sender);
2831 else if (submission_domain[0] == 0) /* empty => full address */
2833 generated_sender_address = string_sprintf("%s",
2838 generated_sender_address = string_sprintf("%s@%s",
2839 local_part_quote(authenticated_id), submission_domain);
2843 generated_sender_address = string_sprintf("%s@%s",
2844 local_part_quote(originator_login), qualify_domain_sender);
2846 /* Remove permitted prefixes and suffixes from the local part of the From:
2847 address before doing the comparison with the generated sender. */
2849 if (from_address != NULL)
2852 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2854 if (at != NULL) *at = 0;
2855 from_address += route_check_prefix(from_address, local_from_prefix);
2856 slen = route_check_suffix(from_address, local_from_suffix);
2859 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2860 from_address += slen;
2862 if (at != NULL) *at = '@';
2864 if (strcmpic(generated_sender_address, from_address) == 0 ||
2865 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2866 make_sender = FALSE;
2869 /* We have to cause the Sender header to be rewritten if there are
2870 appropriate rewriting rules. */
2874 if (submission_mode && submission_name == NULL)
2875 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2876 generated_sender_address);
2878 header_add(htype_sender, "%sSender: %s <%s>\n",
2880 submission_mode? submission_name : originator_name,
2881 generated_sender_address);
2884 /* Ensure that a non-null envelope sender address corresponds to the
2885 submission mode sender address. */
2887 if (submission_mode && sender_address[0] != 0)
2889 if (sender_address_unrewritten == NULL)
2890 sender_address_unrewritten = sender_address;
2891 sender_address = generated_sender_address;
2892 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2893 log_write(L_address_rewrite, LOG_MAIN,
2894 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2895 sender_address_unrewritten, generated_sender_address);
2899 /* If there are any rewriting rules, apply them to the sender address, unless
2900 it has already been rewritten as part of verification for SMTP input. */
2902 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2903 sender_address[0] != 0)
2905 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2906 global_rewrite_rules, rewrite_existflags);
2907 DEBUG(D_receive|D_rewrite)
2908 debug_printf("rewritten sender = %s\n", sender_address);
2912 /* The headers must be run through rewrite_header(), because it ensures that
2913 addresses are fully qualified, as well as applying any rewriting rules that may
2916 Qualification of header addresses in a message from a remote host happens only
2917 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2918 appropriate. For local messages, qualification always happens, unless -bnq is
2919 used to explicitly suppress it. No rewriting is done for an unqualified address
2920 that is left untouched.
2922 We start at the second header, skipping our own Received:. This rewriting is
2923 documented as happening *after* recipient addresses are taken from the headers
2924 by the -t command line option. An added Sender: gets rewritten here. */
2926 for (h = header_list->next; h; h = h->next)
2928 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2929 rewrite_existflags, TRUE);
2934 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2935 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2936 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2937 exists, this applies to the set of resent- headers rather than the normal set.
2939 The requirement for a recipient header has been removed in RFC 2822. At this
2940 point in the code, earlier versions of Exim added a To: header for locally
2941 submitted messages, and an empty Bcc: header for others. In the light of the
2942 changes in RFC 2822, this was dropped in November 2003. */
2945 /* If there is no date header, generate one if the message originates locally
2946 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2947 submission mode flag is set. Messages without Date: are not valid, but it seems
2948 to be more confusing if Exim adds one to all remotely-originated messages.
2949 As per Message-Id, we prepend if resending, else append.
2952 if (!date_header_exists &&
2953 ((sender_host_address == NULL && !suppress_local_fixups)
2954 || submission_mode))
2955 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2956 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2958 search_tidyup(); /* Free any cached resources */
2960 /* Show the complete set of headers if debugging. Note that the first one (the
2961 new Received:) has not yet been set. */
2965 debug_printf(">>Headers after rewriting and local additions:\n");
2966 for (h = header_list->next; h != NULL; h = h->next)
2967 debug_printf("%c %s", h->type, h->text);
2971 /* The headers are now complete in store. If we are running in filter
2972 testing mode, that is all this function does. Return TRUE if the message
2973 ended with a dot. */
2975 if (filter_test != FTEST_NONE)
2977 process_info[process_info_len] = 0;
2978 return message_ended == END_DOT;
2981 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2982 think more if it could be handled. Cannot do onward CHUNKING unless
2983 inbound is, but inbound chunking ought to be ok with outbound plain.
2984 Could we do onward CHUNKING given inbound CHUNKING?
2986 if (chunking_state > CHUNKING_OFFERED)
2987 cancel_cutthrough_connection("chunking active");
2989 /* Cutthrough delivery:
2990 We have to create the Received header now rather than at the end of reception,
2991 so the timestamp behaviour is a change to the normal case.
2992 XXX Ensure this gets documented XXX.
2993 Having created it, send the headers to the destination. */
2994 if (cutthrough.fd >= 0)
2996 if (received_count > received_headers_max)
2998 cancel_cutthrough_connection("too many headers");
2999 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3000 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3001 "Too many \"Received\" headers",
3003 (sender_fullhost == NULL)? "" : " H=",
3004 (sender_fullhost == NULL)? US"" : sender_fullhost,
3005 (sender_ident == NULL)? "" : " U=",
3006 (sender_ident == NULL)? US"" : sender_ident);
3007 message_id[0] = 0; /* Indicate no message accepted */
3008 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3009 goto TIDYUP; /* Skip to end of function */
3011 received_header_gen();
3012 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3013 (void) cutthrough_headers_send();
3017 /* Open a new spool file for the data portion of the message. We need
3018 to access it both via a file descriptor and a stream. Try to make the
3019 directory if it isn't there. */
3021 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3022 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3024 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3026 if (errno == ENOENT)
3028 (void) directory_make(spool_directory,
3029 spool_sname(US"input", message_subdir),
3030 INPUT_DIRECTORY_MODE, TRUE);
3031 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3034 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3035 spool_name, strerror(errno));
3038 /* Make sure the file's group is the Exim gid, and double-check the mode
3039 because the group setting doesn't always get set automatically. */
3041 if (fchown(data_fd, exim_uid, exim_gid))
3042 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3043 "Failed setting ownership on spool file %s: %s",
3044 spool_name, strerror(errno));
3045 (void)fchmod(data_fd, SPOOL_MODE);
3047 /* We now have data file open. Build a stream for it and lock it. We lock only
3048 the first line of the file (containing the message ID) because otherwise there
3049 are problems when Exim is run under Cygwin (I'm told). See comments in
3050 spool_in.c, where the same locking is done. */
3052 data_file = fdopen(data_fd, "w+");
3053 lock_data.l_type = F_WRLCK;
3054 lock_data.l_whence = SEEK_SET;
3055 lock_data.l_start = 0;
3056 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3058 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3059 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3060 errno, strerror(errno));
3062 /* We have an open, locked data file. Write the message id to it to make it
3063 self-identifying. Then read the remainder of the input of this message and
3064 write it to the data file. If the variable next != NULL, it contains the first
3065 data line (which was read as a header but then turned out not to have the right
3066 format); write it (remembering that it might contain binary zeros). The result
3067 of fwrite() isn't inspected; instead we call ferror() below. */
3069 fprintf(data_file, "%s-D\n", message_id);
3072 uschar *s = next->text;
3073 int len = next->slen;
3074 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3075 body_linecount++; /* Assumes only 1 line */
3078 /* Note that we might already be at end of file, or the logical end of file
3079 (indicated by '.'), or might have encountered an error while writing the
3080 message id or "next" line. */
3082 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3086 message_ended = chunking_state > CHUNKING_OFFERED
3087 ? read_message_bdat_smtp(data_file)
3088 : read_message_data_smtp(data_file);
3089 receive_linecount++; /* The terminating "." line */
3091 else message_ended = read_message_data(data_file);
3093 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3094 message_linecount += body_linecount;
3096 switch (message_ended)
3098 /* Handle premature termination of SMTP */
3103 Uunlink(spool_name); /* Lose data file when closed */
3104 cancel_cutthrough_connection("sender closed connection");
3105 message_id[0] = 0; /* Indicate no message accepted */
3106 smtp_reply = handle_lost_connection(US"");
3108 goto TIDYUP; /* Skip to end of function */
3112 /* Handle message that is too big. Don't use host_or_ident() in the log
3113 message; we want to see the ident value even for non-remote messages. */
3116 Uunlink(spool_name); /* Lose the data file when closed */
3117 cancel_cutthrough_connection("mail too big");
3118 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3120 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3121 "message too big: read=%d max=%d",
3123 (sender_fullhost == NULL)? "" : " H=",
3124 (sender_fullhost == NULL)? US"" : sender_fullhost,
3125 (sender_ident == NULL)? "" : " U=",
3126 (sender_ident == NULL)? US"" : sender_ident,
3128 thismessage_size_limit);
3132 smtp_reply = US"552 Message size exceeds maximum permitted";
3133 message_id[0] = 0; /* Indicate no message accepted */
3134 goto TIDYUP; /* Skip to end of function */
3138 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3139 give_local_error(ERRMESS_TOOBIG,
3140 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3141 US"message rejected: ", error_rc, data_file, header_list);
3142 /* Does not return */
3146 /* Handle bad BDAT protocol sequence */
3149 Uunlink(spool_name); /* Lose the data file when closed */
3150 cancel_cutthrough_connection("sender protocol error");
3151 smtp_reply = US""; /* Response already sent */
3152 message_id[0] = 0; /* Indicate no message accepted */
3153 goto TIDYUP; /* Skip to end of function */
3157 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3158 example, there may be some expansion in an ACL that uses a timer.) */
3160 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3162 /* The message body has now been read into the data file. Call fflush() to
3163 empty the buffers in C, and then call fsync() to get the data written out onto
3164 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3165 having to do this). If there was an I/O error on either input or output,
3166 attempt to send an error message, and unlink the spool file. For non-SMTP input
3167 we can then give up. Note that for SMTP input we must swallow the remainder of
3168 the input in cases of output errors, since the far end doesn't expect to see
3169 anything until the terminating dot line is sent. */
3171 if (fflush(data_file) == EOF || ferror(data_file) ||
3172 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3174 uschar *msg_errno = US strerror(errno);
3175 BOOL input_error = (receive_ferror)() != 0;
3176 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3177 input_error? "Input read" : "Spool write",
3179 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3181 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3182 Uunlink(spool_name); /* Lose the data file */
3183 cancel_cutthrough_connection("error writing spoolfile");
3188 smtp_reply = US"451 Error while reading input data";
3191 smtp_reply = US"451 Error while writing spool file";
3192 receive_swallow_smtp();
3194 message_id[0] = 0; /* Indicate no message accepted */
3195 goto TIDYUP; /* Skip to end of function */
3200 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3201 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3203 /* Does not return */
3208 /* No I/O errors were encountered while writing the data file. */
3210 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3213 /* If there were any bad addresses extracted by -t, or there were no recipients
3214 left after -t, send a message to the sender of this message, or write it to
3215 stderr if the error handling option is set that way. Note that there may
3216 legitimately be no recipients for an SMTP message if they have all been removed
3219 We need to rewind the data file in order to read it. In the case of no
3220 recipients or stderr error writing, throw the data file away afterwards, and
3221 exit. (This can't be SMTP, which always ensures there's at least one
3222 syntactically good recipient address.) */
3224 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3228 if (recipients_count == 0) debug_printf("*** No recipients\n");
3229 if (bad_addresses != NULL)
3231 error_block *eblock = bad_addresses;
3232 debug_printf("*** Bad address(es)\n");
3233 while (eblock != NULL)
3235 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3236 eblock = eblock->next;
3241 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3243 /* If configured to send errors to the sender, but this fails, force
3244 a failure error code. We use a special one for no recipients so that it
3245 can be detected by the autoreply transport. Otherwise error_rc is set to
3246 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3247 it is EXIT_SUCCESS. */
3249 if (error_handling == ERRORS_SENDER)
3251 if (!moan_to_sender(
3252 (bad_addresses == NULL)?
3253 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3254 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3255 bad_addresses, header_list, data_file, FALSE))
3256 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3260 if (bad_addresses == NULL)
3262 if (extracted_ignored)
3263 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3265 fprintf(stderr, "exim: no recipients in message\n");
3269 fprintf(stderr, "exim: invalid address%s",
3270 (bad_addresses->next == NULL)? ":" : "es:\n");
3271 while (bad_addresses != NULL)
3273 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3274 bad_addresses->text2);
3275 bad_addresses = bad_addresses->next;
3280 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3282 Uunlink(spool_name);
3283 (void)fclose(data_file);
3284 exim_exit(error_rc);
3288 /* Data file successfully written. Generate text for the Received: header by
3289 expanding the configured string, and adding a timestamp. By leaving this
3290 operation till now, we ensure that the timestamp is the time that message
3291 reception was completed. However, this is deliberately done before calling the
3292 data ACL and local_scan().
3294 This Received: header may therefore be inspected by the data ACL and by code in
3295 the local_scan() function. When they have run, we update the timestamp to be
3296 the final time of reception.
3298 If there is just one recipient, set up its value in the $received_for variable
3299 for use when we generate the Received: header.
3301 Note: the checking for too many Received: headers is handled by the delivery
3303 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3305 if (received_header->text == NULL) /* Non-cutthrough case */
3307 received_header_gen();
3309 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3311 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3312 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3314 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3315 now, before running the DATA ACL. */
3317 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3320 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3321 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3323 /* If an ACL is specified for checking things at this stage of reception of a
3324 message, run it, unless all the recipients were removed by "discard" in earlier
3325 ACLs. That is the only case in which recipients_count can be zero at this
3326 stage. Set deliver_datafile to point to the data file so that $message_body and
3327 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3330 deliver_datafile = data_fd;
3333 enable_dollar_recipients = TRUE;
3335 if (recipients_count == 0)
3336 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3340 /* Handle interactive SMTP messages */
3342 if (smtp_input && !smtp_batched_input)
3345 #ifndef DISABLE_DKIM
3346 if (!dkim_disable_verify)
3348 /* Finish verification, this will log individual signature results to
3350 dkim_exim_verify_finish();
3352 /* Check if we must run the DKIM ACL */
3353 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3355 uschar *dkim_verify_signers_expanded =
3356 expand_string(dkim_verify_signers);
3357 if (!dkim_verify_signers_expanded)
3358 log_write(0, LOG_MAIN|LOG_PANIC,
3359 "expansion of dkim_verify_signers option failed: %s",
3360 expand_string_message);
3365 const uschar *ptr = dkim_verify_signers_expanded;
3366 uschar *item = NULL;
3367 uschar *seen_items = NULL;
3368 int seen_items_size = 0;
3369 int seen_items_offset = 0;
3370 /* Default to OK when no items are present */
3372 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3374 /* Prevent running ACL for an empty item */
3375 if (!item || !*item) continue;
3377 /* Only run ACL once for each domain or identity,
3378 no matter how often it appears in the expanded list. */
3381 uschar *seen_item = NULL;
3382 const uschar *seen_items_list = seen_items;
3383 BOOL seen_this_item = FALSE;
3385 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3387 if (Ustrcmp(seen_item,item) == 0)
3389 seen_this_item = TRUE;
3396 debug_printf("acl_smtp_dkim: skipping signer %s, "
3397 "already seen\n", item);
3401 seen_items = string_append(seen_items, &seen_items_size,
3402 &seen_items_offset, 1, ":");
3405 seen_items = string_append(seen_items, &seen_items_size,
3406 &seen_items_offset, 1, item);
3407 seen_items[seen_items_offset] = '\0';
3410 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3413 dkim_exim_acl_setup(item);
3414 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3415 &user_msg, &log_msg);
3420 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3421 "skipping remaining items\n", rc, item);
3422 cancel_cutthrough_connection("dkim acl not ok");
3426 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3429 recipients_count = 0;
3430 blackholed_by = US"DKIM ACL";
3431 if (log_msg != NULL)
3432 blackhole_log_msg = string_sprintf(": %s", log_msg);
3436 Uunlink(spool_name);
3437 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3438 smtp_yield = FALSE; /* No more messages after dropped connection */
3439 smtp_reply = US""; /* Indicate reply already sent */
3440 message_id[0] = 0; /* Indicate no message accepted */
3441 goto TIDYUP; /* Skip to end of function */
3446 #endif /* DISABLE_DKIM */
3448 #ifdef WITH_CONTENT_SCAN
3449 if (recipients_count > 0 &&
3450 acl_smtp_mime != NULL &&
3451 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3453 #endif /* WITH_CONTENT_SCAN */
3455 #ifdef EXPERIMENTAL_DMARC
3456 dmarc_up = dmarc_store_data(from_header);
3457 #endif /* EXPERIMENTAL_DMARC */
3459 #ifndef DISABLE_PRDR
3460 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3464 int all_fail = FAIL;
3466 smtp_printf("353 PRDR content analysis beginning\r\n");
3467 /* Loop through recipients, responses must be in same order received */
3468 for (c = 0; recipients_count > c; c++)
3470 uschar * addr= recipients_list[c].address;
3471 uschar * msg= US"PRDR R=<%s> %s";
3474 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3475 addr, c+1, recipients_count);
3476 rc = acl_check(ACL_WHERE_PRDR, addr,
3477 acl_smtp_data_prdr, &user_msg, &log_msg);
3479 /* If any recipient rejected content, indicate it in final message */
3481 /* If all recipients rejected, indicate in final message */
3486 case OK: case DISCARD: code = US"250"; break;
3487 case DEFER: code = US"450"; break;
3488 default: code = US"550"; break;
3490 if (user_msg != NULL)
3491 smtp_user_msg(code, user_msg);
3496 case OK: case DISCARD:
3497 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3499 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3501 msg = string_sprintf(CS msg, addr, "refusal"); break;
3503 smtp_user_msg(code, msg);
3505 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3506 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3507 else log_write(0, LOG_MAIN, "%s", CS msg);
3509 if (rc != OK) { receive_remove_recipient(addr); c--; }
3511 /* Set up final message, used if data acl gives OK */
3512 smtp_reply = string_sprintf("%s id=%s message %s",
3513 all_fail == FAIL ? US"550" : US"250",
3516 ? US"rejected for all recipients"
3519 : US"accepted for some recipients");
3520 if (recipients_count == 0)
3522 message_id[0] = 0; /* Indicate no message accepted */
3527 prdr_requested = FALSE;
3528 #endif /* !DISABLE_PRDR */
3530 /* Check the recipients count again, as the MIME ACL might have changed
3533 if (acl_smtp_data != NULL && recipients_count > 0)
3535 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3536 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3539 recipients_count = 0;
3540 blackholed_by = US"DATA ACL";
3541 if (log_msg != NULL)
3542 blackhole_log_msg = string_sprintf(": %s", log_msg);
3543 cancel_cutthrough_connection("data acl discard");
3547 Uunlink(spool_name);
3548 cancel_cutthrough_connection("data acl not ok");
3549 #ifdef WITH_CONTENT_SCAN
3552 #ifdef EXPERIMENTAL_DCC
3555 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3556 smtp_yield = FALSE; /* No more messages after dropped connection */
3557 smtp_reply = US""; /* Indicate reply already sent */
3558 message_id[0] = 0; /* Indicate no message accepted */
3559 goto TIDYUP; /* Skip to end of function */
3564 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3565 we cannot take different actions for permanent and temporary rejections. */
3570 #ifdef WITH_CONTENT_SCAN
3571 if (acl_not_smtp_mime != NULL &&
3572 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3575 #endif /* WITH_CONTENT_SCAN */
3577 if (acl_not_smtp != NULL)
3579 uschar *user_msg, *log_msg;
3580 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3583 recipients_count = 0;
3584 blackholed_by = US"non-SMTP ACL";
3585 if (log_msg != NULL)
3586 blackhole_log_msg = string_sprintf(": %s", log_msg);
3590 Uunlink(spool_name);
3591 #ifdef WITH_CONTENT_SCAN
3594 #ifdef EXPERIMENTAL_DCC
3597 /* The ACL can specify where rejections are to be logged, possibly
3598 nowhere. The default is main and reject logs. */
3600 if (log_reject_target != 0)
3601 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3602 sender_address, log_msg);
3604 if (user_msg == NULL) user_msg = US"local configuration problem";
3605 if (smtp_batched_input)
3607 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3608 /* Does not return */
3612 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3613 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3614 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3616 /* Does not return */
3619 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3623 /* The applicable ACLs have been run */
3625 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3626 if (queue_only_policy) queued_by = US"ACL";
3629 #ifdef WITH_CONTENT_SCAN
3633 #ifdef EXPERIMENTAL_DCC
3638 /* The final check on the message is to run the scan_local() function. The
3639 version supplied with Exim always accepts, but this is a hook for sysadmins to
3640 supply their own checking code. The local_scan() function is run even when all
3641 the recipients have been discarded. */
3643 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3645 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3646 deleted, and the incident gets logged. */
3648 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3649 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3650 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3651 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3653 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3654 local_scan_timeout);
3655 local_scan_data = NULL;
3657 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3658 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3659 rc = local_scan(data_fd, &local_scan_data);
3661 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3663 enable_dollar_recipients = FALSE;
3665 store_pool = POOL_MAIN; /* In case changed */
3666 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3669 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3670 os_non_restarting_signal(SIGFPE, SIG_DFL);
3671 os_non_restarting_signal(SIGILL, SIG_DFL);
3672 os_non_restarting_signal(SIGBUS, SIG_DFL);
3674 /* The length check is paranoia against some runaway code, and also because
3675 (for a success return) lines in the spool file are read into big_buffer. */
3677 if (local_scan_data != NULL)
3679 int len = Ustrlen(local_scan_data);
3680 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3681 local_scan_data = string_copyn(local_scan_data, len);
3684 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3686 if (!deliver_freeze) /* ACL might have already frozen */
3688 deliver_freeze = TRUE;
3689 deliver_frozen_at = time(NULL);
3690 frozen_by = US"local_scan()";
3692 rc = LOCAL_SCAN_ACCEPT;
3694 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3696 if (!queue_only_policy) /* ACL might have already queued */
3698 queue_only_policy = TRUE;
3699 queued_by = US"local_scan()";
3701 rc = LOCAL_SCAN_ACCEPT;
3704 /* Message accepted: remove newlines in local_scan_data because otherwise
3705 the spool file gets corrupted. Ensure that all recipients are qualified. */
3707 if (rc == LOCAL_SCAN_ACCEPT)
3709 if (local_scan_data != NULL)
3712 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3714 for (i = 0; i < recipients_count; i++)
3716 recipient_item *r = recipients_list + i;
3717 r->address = rewrite_address_qualify(r->address, TRUE);
3718 if (r->errors_to != NULL)
3719 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3721 if (recipients_count == 0 && blackholed_by == NULL)
3722 blackholed_by = US"local_scan";
3725 /* Message rejected: newlines permitted in local_scan_data to generate
3726 multiline SMTP responses. */
3730 uschar *istemp = US"";
3736 errmsg = local_scan_data;
3738 Uunlink(spool_name); /* Cancel this message */
3742 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3743 "rejection given", rc);
3746 case LOCAL_SCAN_REJECT_NOLOGHDR:
3747 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3750 case LOCAL_SCAN_REJECT:
3751 smtp_code = US"550";
3752 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3755 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3756 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3759 case LOCAL_SCAN_TEMPREJECT:
3761 smtp_code = US"451";
3762 if (errmsg == NULL) errmsg = US"Temporary local problem";
3763 istemp = US"temporarily ";
3767 s = string_append(s, &size, &sptr, 2, US"F=",
3768 (sender_address[0] == 0)? US"<>" : sender_address);
3769 s = add_host_info_for_log(s, &size, &sptr);
3772 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3773 s, istemp, string_printing(errmsg));
3777 if (!smtp_batched_input)
3779 smtp_respond(smtp_code, 3, TRUE, errmsg);
3780 message_id[0] = 0; /* Indicate no message accepted */
3781 smtp_reply = US""; /* Indicate reply already sent */
3782 goto TIDYUP; /* Skip to end of function */
3786 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3787 /* Does not return */
3792 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3793 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3794 US"message rejected by local scan code: ", error_rc, data_file,
3796 /* Does not return */
3800 /* Reset signal handlers to ignore signals that previously would have caused
3801 the message to be abandoned. */
3803 signal(SIGTERM, SIG_IGN);
3804 signal(SIGINT, SIG_IGN);
3807 /* Ensure the first time flag is set in the newly-received message. */
3809 deliver_firsttime = TRUE;
3811 #ifdef EXPERIMENTAL_BRIGHTMAIL
3813 { /* rewind data file */
3814 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3815 bmi_verdicts = bmi_process_message(header_list, data_fd);
3819 /* Update the timestamp in our Received: header to account for any time taken by
3820 an ACL or by local_scan(). The new time is the time that all reception
3821 processing is complete. */
3823 timestamp = expand_string(US"${tod_full}");
3824 tslen = Ustrlen(timestamp);
3826 memcpy(received_header->text + received_header->slen - tslen - 1,
3829 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3833 deliver_freeze = FALSE;
3834 queue_only_policy = FALSE;
3837 /* Keep the data file open until we have written the header file, in order to
3838 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3839 don't write the header file, and we unlink the data file. If writing the header
3840 file fails, we have failed to accept this message. */
3842 if (host_checking || blackholed_by != NULL)
3845 Uunlink(spool_name);
3846 msg_size = 0; /* Compute size for log line */
3847 for (h = header_list; h != NULL; h = h->next)
3848 if (h->type != '*') msg_size += h->slen;
3851 /* Write the -H file */
3854 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3856 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3857 Uunlink(spool_name); /* Lose the data file */
3861 smtp_reply = US"451 Error in writing spool file";
3862 message_id[0] = 0; /* Indicate no message accepted */
3867 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3868 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3870 /* Does not return */
3875 /* The message has now been successfully received. */
3877 receive_messagecount++;
3879 /* In SMTP sessions we may receive several in one connection. After each one,
3880 we wait for the clock to tick at the level of message-id granularity. This is
3881 so that the combination of time+pid is unique, even on systems where the pid
3882 can be re-used within our time interval. We can't shorten the interval without
3883 re-designing the message-id. See comments above where the message id is
3884 created. This is Something For The Future. */
3886 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3887 exim_wait_tick(&message_id_tv, id_resolution);
3889 /* Add data size to written header size. We do not count the initial file name
3890 that is in the file, but we do add one extra for the notional blank line that
3891 precedes the data. This total differs from message_size in that it include the
3892 added Received: header and any other headers that got created locally. */
3895 fstat(data_fd, &statbuf);
3897 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3899 /* Generate a "message received" log entry. We do this by building up a dynamic
3900 string as required. Since we commonly want to add two items at a time, use a
3901 macro to simplify the coding. We log the arrival of a new message while the
3902 file is still locked, just in case the machine is *really* fast, and delivers
3903 it first! Include any message id that is in the message - since the syntax of a
3904 message id is actually an addr-spec, we can use the parse routine to canonicalize
3909 s = store_get(size);
3911 s = string_append(s, &size, &sptr, 2,
3912 fake_response == FAIL ? US"(= " : US"<= ",
3913 sender_address[0] == 0 ? US"<>" : sender_address);
3914 if (message_reference)
3915 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3917 s = add_host_info_for_log(s, &size, &sptr);
3920 if (LOGGING(tls_cipher) && tls_in.cipher)
3921 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3922 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3923 s = string_append(s, &size, &sptr, 2, US" CV=",
3924 tls_in.certificate_verified ? "yes":"no");
3925 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3926 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3927 string_printing(tls_in.peerdn), US"\"");
3928 if (LOGGING(tls_sni) && tls_in.sni)
3929 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3930 string_printing(tls_in.sni), US"\"");
3933 if (sender_host_authenticated)
3935 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3936 if (authenticated_id)
3938 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3939 if (LOGGING(smtp_mailauth) && authenticated_sender)
3940 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3944 #ifndef DISABLE_PRDR
3946 s = string_catn(s, &size, &sptr, US" PRDR", 5);
3949 #ifdef SUPPORT_PROXY
3950 if (proxy_session && LOGGING(proxy))
3951 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3954 if (chunking_state > CHUNKING_OFFERED)
3955 s = string_catn(s, &size, &sptr, US" K", 2);
3957 sprintf(CS big_buffer, "%d", msg_size);
3958 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3960 /* log 8BITMIME mode announced in MAIL_FROM
3964 if (LOGGING(8bitmime))
3966 sprintf(CS big_buffer, "%d", body_8bitmime);
3967 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3971 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
3973 /* If an addr-spec in a message-id contains a quoted string, it can contain
3974 any characters except " \ and CR and so in particular it can contain NL!
3975 Therefore, make sure we use a printing-characters only version for the log.
3976 Also, allow for domain literals in the message id. */
3981 BOOL save_allow_domain_literals = allow_domain_literals;
3982 allow_domain_literals = TRUE;
3983 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3984 &errmsg, &start, &end, &domain, FALSE);
3985 allow_domain_literals = save_allow_domain_literals;
3987 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3990 /* If subject logging is turned on, create suitable printing-character
3991 text. By expanding $h_subject: we make use of the MIME decoding. */
3993 if (LOGGING(subject) && subject_header != NULL)
3996 uschar *p = big_buffer;
3997 uschar *ss = expand_string(US"$h_subject:");
3999 /* Backslash-quote any double quotes or backslashes so as to make a
4000 a C-like string, and turn any non-printers into escape sequences. */
4003 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4005 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4010 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
4013 /* Terminate the string: string_cat() and string_append() leave room, but do
4014 not put the zero in. */
4018 /* Create a message log file if message logs are being used and this message is
4019 not blackholed. Write the reception stuff to it. We used to leave message log
4020 creation until the first delivery, but this has proved confusing for some
4023 if (message_logs && blackholed_by == NULL)
4027 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4029 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4033 (void)directory_make(spool_directory,
4034 spool_sname(US"msglog", message_subdir),
4035 MSGLOG_DIRECTORY_MODE, TRUE);
4036 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4041 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4042 spool_name, strerror(errno));
4047 FILE *message_log = fdopen(fd, "a");
4048 if (message_log == NULL)
4050 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4051 spool_name, strerror(errno));
4056 uschar *now = tod_stamp(tod_log);
4057 fprintf(message_log, "%s Received from %s\n", now, s+3);
4058 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4060 if (queue_only_policy) fprintf(message_log,
4061 "%s no immediate delivery: queued%s%s by %s\n", now,
4062 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4064 (void)fclose(message_log);
4069 /* Everything has now been done for a successful message except logging its
4070 arrival, and outputting an SMTP response. While writing to the log, set a flag
4071 to cause a call to receive_bomb_out() if the log cannot be opened. */
4073 receive_call_bombout = TRUE;
4075 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4076 connection has gone away. This can only be done if there is no unconsumed input
4077 waiting in the local input buffer. We can test for this by calling
4078 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4079 input to be sent following the final dot, so the presence of following input is
4082 If the connection is still present, but there is no unread input for the
4083 socket, the result of a select() call will be zero. If, however, the connection
4084 has gone away, or if there is pending input, the result of select() will be
4085 non-zero. The two cases can be distinguished by trying to read the next input
4086 character. If we succeed, we can unread it so that it remains in the local
4087 buffer for handling later. If not, the connection has been lost.
4089 Of course, since TCP/IP is asynchronous, there is always a chance that the
4090 connection will vanish between the time of this test and the sending of the
4091 response, but the chance of this happening should be small. */
4093 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4094 !receive_smtp_buffered())
4097 fd_set select_check;
4098 FD_ZERO(&select_check);
4099 FD_SET(fileno(smtp_in), &select_check);
4103 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4105 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4106 if (c != EOF) (receive_ungetc)(c); else
4108 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4109 smtp_reply = US""; /* No attempt to send a response */
4110 smtp_yield = FALSE; /* Nothing more on this connection */
4112 /* Re-use the log line workspace */
4115 s = string_cat(s, &size, &sptr, US"SMTP connection lost after final dot");
4116 s = add_host_info_for_log(s, &size, &sptr);
4118 log_write(0, LOG_MAIN, "%s", s);
4120 /* Delete the files for this aborted message. */
4122 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4123 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4124 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4131 /* The connection has not gone away; we really are going to take responsibility
4132 for this message. */
4134 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4137 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4138 the sender's dot (below).
4139 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4140 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4141 in which case pass temp-reject back to initiator and dump the files.
4143 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4145 XXX We do not handle queue-only, freezing, or blackholes.
4147 if(cutthrough.fd >= 0)
4149 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the message */
4150 /* Logging was done in finaldot() */
4153 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4154 cutthrough_done = ACCEPTED;
4155 break; /* message_id needed for SMTP accept below */
4157 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4158 ... for which, pass back the exact error */
4159 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4162 default: /* Unknown response, or error. Treat as temp-reject. */
4163 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4164 break; /* message_id needed for SMTP accept below */
4166 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4167 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4168 cutthrough_done = PERM_REJ;
4173 #ifndef DISABLE_PRDR
4174 if(!smtp_reply || prdr_requested)
4179 log_write(0, LOG_MAIN |
4180 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4181 (LOGGING(received_sender)? LOG_SENDER : 0),
4184 /* Log any control actions taken by an ACL or local_scan(). */
4186 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4187 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4188 "no immediate delivery: queued%s%s by %s",
4189 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4192 receive_call_bombout = FALSE;
4194 store_reset(s); /* The store for the main log message can be reused */
4196 /* If the message is frozen, and freeze_tell is set, do the telling. */
4198 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4200 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4201 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4202 message_id, frozen_by, sender_address);
4206 /* Either a message has been successfully received and written to the two spool
4207 files, or an error in writing the spool has occurred for an SMTP message, or
4208 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4209 we will have already given up because there's no point in carrying on!) In
4210 either event, we must now close (and thereby unlock) the data file. In the
4211 successful case, this leaves the message on the spool, ready for delivery. In
4212 the error case, the spool file will be deleted. Then tidy up store, interact
4213 with an SMTP call if necessary, and return.
4215 A fflush() was done earlier in the expectation that any write errors on the
4216 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4217 possible for fclose() to fail - but what to do? What has happened to the lock
4222 process_info[process_info_len] = 0; /* Remove message id */
4223 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4225 /* Now reset signal handlers to their defaults */
4227 signal(SIGTERM, SIG_DFL);
4228 signal(SIGINT, SIG_DFL);
4230 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4231 value, which defaults TRUE - meaning there may be more incoming messages from
4232 this connection. For non-SMTP callers (where there is only ever one message),
4233 the default is FALSE. */
4239 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4240 is set to the response that should be sent. When it is NULL, we generate
4241 default responses. After an ACL error or local_scan() error, the response has
4242 already been sent, and smtp_reply is an empty string to indicate this. */
4244 if (!smtp_batched_input)
4248 if (fake_response != OK)
4249 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4250 3, TRUE, fake_response_text);
4252 /* An OK response is required; use "message" text if present. */
4256 uschar *code = US"250";
4258 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4259 smtp_respond(code, len, TRUE, user_msg);
4262 /* Default OK response */
4264 else if (chunking_state > CHUNKING_OFFERED)
4266 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4267 chunking_datasize, message_size+message_linecount, message_id);
4268 chunking_state = CHUNKING_OFFERED;
4271 smtp_printf("250 OK id=%s\r\n", message_id);
4275 "\n**** SMTP testing: that is not a real message id!\n\n");
4278 /* smtp_reply is set non-empty */
4280 else if (smtp_reply[0] != 0)
4281 if (fake_response != OK && (smtp_reply[0] == '2'))
4282 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4283 fake_response_text);
4285 smtp_printf("%.1024s\r\n", smtp_reply);
4287 switch (cutthrough_done)
4290 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4292 /* Delete spool files */
4293 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4294 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4295 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4296 message_id[0] = 0; /* Prevent a delivery from starting */
4300 if (cutthrough.defer_pass)
4302 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4303 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4304 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4306 message_id[0] = 0; /* Prevent a delivery from starting */
4310 cutthrough.delivery = FALSE;
4311 cutthrough.defer_pass = FALSE;
4314 /* For batched SMTP, generate an error message on failure, and do
4315 nothing on success. The function moan_smtp_batch() does not return -
4316 it exits from the program with a non-zero return code. */
4318 else if (smtp_reply)
4319 moan_smtp_batch(NULL, "%s", smtp_reply);
4323 /* If blackholing, we can immediately log this message's sad fate. The data
4324 file has already been unlinked, and the header file was never written to disk.
4325 We must now indicate that nothing was received, to prevent a delivery from
4330 const uschar *detail = local_scan_data
4331 ? string_printing(local_scan_data)
4332 : string_sprintf("(%s discarded recipients)", blackholed_by);
4333 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4334 log_write(0, LOG_MAIN, "Completed");
4338 /* Reset headers so that logging of rejects for a subsequent message doesn't
4339 include them. It is also important to set header_last = NULL before exiting
4340 from this function, as this prevents certain rewrites that might happen during
4341 subsequent verifying (of another incoming message) from trying to add headers
4342 when they shouldn't. */
4344 header_list = header_last = NULL;
4346 return yield; /* TRUE if more messages (SMTP only) */
4349 /* End of receive.c */