1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
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"";
30 /*************************************************
31 * Non-SMTP character reading functions *
32 *************************************************/
34 /* These are the default functions that are set up in the variables such as
35 receive_getc initially. They just call the standard functions, passing stdin as
36 the file. (When SMTP input is occurring, different functions are used by
37 changing the pointer variables.) */
48 return ungetc(c, stdin);
66 /*************************************************
67 * Check that a set sender is allowed *
68 *************************************************/
70 /* This function is called when a local caller sets an explicit sender address.
71 It checks whether this is permitted, which it is for trusted callers.
72 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74 Arguments: the proposed sender address
75 Returns: TRUE for a trusted caller
76 TRUE if the address has been set, untrusted_set_sender has been
77 set, and the address matches something in the list
82 receive_check_set_sender(uschar *newsender)
85 if (trusted_caller) return TRUE;
86 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
87 qnewsender = (Ustrchr(newsender, '@') != NULL)?
88 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 match_address_list(qnewsender, TRUE, TRUE, CUSS &untrusted_set_sender, NULL, -1,
97 /*************************************************
98 * Read space info for a partition *
99 *************************************************/
101 /* This function is called by receive_check_fs() below, and also by string
102 expansion for variables such as $spool_space. The field names for the statvfs
103 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
104 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
105 have inodes, and they return -1 for the number available.
107 Later: It turns out that some file systems that do not have the concept of
108 inodes return 0 rather than -1. Such systems should also return 0 for the total
109 number of inodes, so we require that to be greater than zero before returning
113 isspool TRUE for spool partition, FALSE for log partition
114 inodeptr address of int to receive inode count; -1 if there isn't one
116 Returns: available on-root space, in kilobytes
117 -1 for log partition if there isn't one
119 All values are -1 if the STATFS functions are not available.
123 receive_statvfs(BOOL isspool, int *inodeptr)
126 struct STATVFS statbuf;
131 /* The spool directory must always exist. */
135 path = spool_directory;
139 /* Need to cut down the log file path to the directory, and to ignore any
140 appearance of "syslog" in it. */
144 int sep = ':'; /* Not variable - outside scripts use */
145 const uschar *p = log_file_path;
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
151 if (*p == 0) p = US":";
152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
153 if (Ustrcmp(path, "syslog") != 0)
156 if (path == NULL) /* No log files */
162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
164 subdirectory has been symbolically linked elsewhere. */
168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
178 /* We now have the path; do the business */
180 memset(&statbuf, 0, sizeof(statbuf));
182 if (STATVFS(CS path, &statbuf) != 0)
184 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
185 "%s directory %s: %s", name, spool_directory, strerror(errno));
186 smtp_closedown(US"spool or log directory problem");
187 exim_exit(EXIT_FAILURE);
190 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
192 /* Disks are getting huge. Take care with computing the size in kilobytes. */
194 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
196 /* Unable to find partition sizes in this environment. */
207 /*************************************************
208 * Check space on spool and log partitions *
209 *************************************************/
211 /* This function is called before accepting a message; if any thresholds are
212 set, it checks them. If a message_size is supplied, it checks that there is
213 enough space for that size plus the threshold - i.e. that the message won't
214 reduce the space to the threshold. Not all OS have statvfs(); for those that
215 don't, this function always returns TRUE. For some OS the old function and
216 struct name statfs is used; that is handled by a macro, defined in exim.h.
219 msg_size the (estimated) size of an incoming message
221 Returns: FALSE if there isn't enough space, or if the information cannot
223 TRUE if no check was done or there is enough space
227 receive_check_fs(int msg_size)
231 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
233 space = receive_statvfs(TRUE, &inodes);
236 debug_printf("spool directory space = %dK inodes = %d "
237 "check_space = %dK inodes = %d msg_size = %d\n",
238 space, inodes, check_spool_space, check_spool_inodes, msg_size);
240 if ((space >= 0 && space < check_spool_space) ||
241 (inodes >= 0 && inodes < check_spool_inodes))
243 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
244 "inodes=%d", space, inodes);
249 if (check_log_space > 0 || check_log_inodes > 0)
251 space = receive_statvfs(FALSE, &inodes);
254 debug_printf("log directory space = %dK inodes = %d "
255 "check_space = %dK inodes = %d\n",
256 space, inodes, check_log_space, check_log_inodes);
258 if ((space >= 0 && space < check_log_space) ||
259 (inodes >= 0 && inodes < check_log_inodes))
261 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
262 "inodes=%d", space, inodes);
272 /*************************************************
273 * Bomb out while reading a message *
274 *************************************************/
276 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
277 received, or if there is a timeout. A rarer case might be if the log files are
278 screwed up and Exim can't open them to record a message's arrival. Handling
279 that case is done by setting a flag to cause the log functions to call this
280 function if there is an ultimate disaster. That is why it is globally
284 reason text reason to pass to the not-quit ACL
285 msg default SMTP response to give if in an SMTP session
290 receive_bomb_out(uschar *reason, uschar *msg)
292 static BOOL already_bombing_out;
293 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
294 timeouts, if someone has something slow in their quit ACL. Since the only
295 things we should be doing are to close down cleanly ASAP, on the second
296 pass we also close down stuff that might be opened again, before bypassing
297 the ACL call and exiting. */
299 /* If spool_name is set, it contains the name of the data file that is being
300 written. Unlink it before closing so that it cannot be picked up by a delivery
301 process. Ensure that any header file is also removed. */
303 if (spool_name[0] != '\0')
306 spool_name[Ustrlen(spool_name) - 1] = 'H';
308 spool_name[0] = '\0';
311 /* Now close the file if it is open, either as a fd or a stream. */
313 if (data_file != NULL)
315 (void)fclose(data_file);
317 } else if (data_fd >= 0) {
318 (void)close(data_fd);
322 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
323 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
326 if (!already_bombing_out)
328 already_bombing_out = TRUE;
331 if (smtp_batched_input)
332 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
333 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
334 smtp_active_hostname, msg);
338 /* Exit from the program (non-BSMTP cases) */
340 exim_exit(EXIT_FAILURE);
344 /*************************************************
345 * Data read timeout *
346 *************************************************/
348 /* Handler function for timeouts that occur while reading the data that
351 Argument: the signal number
356 data_timeout_handler(int sig)
360 sig = sig; /* Keep picky compilers happy */
364 msg = US"SMTP incoming data timeout";
365 log_write(L_lost_incoming_connection,
366 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
368 (sender_fullhost != NULL)? sender_fullhost : US"local process",
373 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
374 log_write(L_lost_incoming_connection,
375 LOG_MAIN, "timed out while reading local message");
378 receive_bomb_out(US"data-timeout", msg); /* Does not return */
383 /*************************************************
384 * local_scan() timeout *
385 *************************************************/
387 /* Handler function for timeouts that occur while running a local_scan()
390 Argument: the signal number
395 local_scan_timeout_handler(int sig)
397 sig = sig; /* Keep picky compilers happy */
398 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
399 "message temporarily rejected (size %d)", message_size);
400 /* Does not return */
401 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
406 /*************************************************
407 * local_scan() crashed *
408 *************************************************/
410 /* Handler function for signals that occur while running a local_scan()
413 Argument: the signal number
418 local_scan_crash_handler(int sig)
420 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
421 "signal %d - message temporarily rejected (size %d)", sig, message_size);
422 /* Does not return */
423 receive_bomb_out(US"local-scan-error", US"local verification problem");
427 /*************************************************
428 * SIGTERM or SIGINT received *
429 *************************************************/
431 /* Handler for SIGTERM or SIGINT signals that occur while reading the
432 data that comprises a message.
434 Argument: the signal number
439 data_sigterm_sigint_handler(int sig)
445 msg = US"Service not available - SIGTERM or SIGINT received";
446 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
447 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
451 if (filter_test == FTEST_NONE)
453 fprintf(stderr, "\nexim: %s received - message abandoned\n",
454 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
455 log_write(0, LOG_MAIN, "%s received while reading local message",
456 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
460 receive_bomb_out(US"signal-exit", msg); /* Does not return */
465 /*************************************************
466 * Add new recipient to list *
467 *************************************************/
469 /* This function builds a list of recipient addresses in argc/argv
473 recipient the next address to add to recipients_list
474 pno parent number for fixed aliases; -1 otherwise
480 receive_add_recipient(uschar *recipient, int pno)
482 if (recipients_count >= recipients_list_max)
484 recipient_item *oldlist = recipients_list;
485 int oldmax = recipients_list_max;
486 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
487 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
489 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
492 recipients_list[recipients_count].address = recipient;
493 recipients_list[recipients_count].pno = pno;
494 #ifdef EXPERIMENTAL_BRIGHTMAIL
495 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
496 /* reset optin string pointer for next recipient */
497 bmi_current_optin = NULL;
499 recipients_list[recipients_count].orcpt = NULL;
500 recipients_list[recipients_count].dsn_flags = 0;
501 recipients_list[recipients_count++].errors_to = NULL;
507 /*************************************************
508 * Send user response message *
509 *************************************************/
511 /* This function is passed a default response code and a user message. It calls
512 smtp_message_code() to check and possibly modify the response code, and then
513 calls smtp_respond() to transmit the response. I put this into a function
514 just to avoid a lot of repetition.
517 code the response code
518 user_msg the user message
525 smtp_user_msg(uschar *code, uschar *user_msg)
528 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
529 smtp_respond(code, len, TRUE, user_msg);
537 /*************************************************
538 * Remove a recipient from the list *
539 *************************************************/
541 /* This function is provided for local_scan() to use.
544 recipient address to remove
546 Returns: TRUE if it did remove something; FALSE otherwise
550 receive_remove_recipient(uschar *recipient)
553 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
555 for (count = 0; count < recipients_count; count++)
557 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
559 if ((--recipients_count - count) > 0)
560 memmove(recipients_list + count, recipients_list + count + 1,
561 (recipients_count - count)*sizeof(recipient_item));
572 /*************************************************
573 * Read data portion of a non-SMTP message *
574 *************************************************/
576 /* This function is called to read the remainder of a message (following the
577 header) when the input is not from SMTP - we are receiving a local message on
578 a standard input stream. The message is always terminated by EOF, and is also
579 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
580 two cases for maximum efficiency.
582 Ensure that the body ends with a newline. This will naturally be the case when
583 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
584 as "sequences of lines" - this of course strictly applies only to SMTP, but
585 deliveries into BSD-type mailbox files also require it. Exim used to have a
586 flag for doing this at delivery time, but as it was always set for all
587 transports, I decided to simplify things by putting the check here instead.
589 There is at least one MUA (dtmail) that sends CRLF via this interface, and
590 other programs are known to do this as well. Exim used to have a option for
591 dealing with this: in July 2003, after much discussion, the code has been
592 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
594 However, for the case when a dot on a line by itself terminates a message, the
595 only recognized terminating sequences before and after the dot are LF and CRLF.
596 Otherwise, having read EOL . CR, you don't know whether to read another
599 Internally, in messages stored in Exim's spool files, LF is used as the line
600 terminator. Under the new regime, bare CRs will no longer appear in these
604 fout a FILE to which to write the message
606 Returns: One of the END_xxx values indicating why it stopped reading
610 read_message_data(FILE *fout)
614 register int linelength = 0;
616 /* Handle the case when only EOF terminates the message */
620 register int last_ch = '\n';
622 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
624 if (ch == 0) body_zerocount++;
625 if (last_ch == '\r' && ch != '\n')
627 if (linelength > max_received_linelength)
628 max_received_linelength = linelength;
630 if (fputc('\n', fout) == EOF) return END_WERROR;
634 if (ch == '\r') continue;
636 if (fputc(ch, fout) == EOF) return END_WERROR;
639 if (linelength > max_received_linelength)
640 max_received_linelength = linelength;
645 if (++message_size > thismessage_size_limit) return END_SIZE;
650 if (linelength > max_received_linelength)
651 max_received_linelength = linelength;
652 if (fputc('\n', fout) == EOF) return END_WERROR;
660 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
664 while ((ch = (receive_getc)()) != EOF)
666 if (ch == 0) body_zerocount++;
669 case 0: /* Normal state (previous char written) */
673 if (linelength > max_received_linelength)
674 max_received_linelength = linelength;
679 { ch_state = 2; continue; }
682 case 1: /* After written "\n" */
683 if (ch == '.') { ch_state = 3; continue; }
684 if (ch == '\r') { ch_state = 2; continue; }
685 if (ch != '\n') ch_state = 0; else linelength = -1;
689 body_linecount++; /* After unwritten "\r" */
690 if (linelength > max_received_linelength)
691 max_received_linelength = linelength;
699 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
700 if (ch == '\r') continue;
706 case 3: /* After "\n." (\n written, dot not) */
707 if (ch == '\n') return END_DOT;
708 if (ch == '\r') { ch_state = 4; continue; }
711 if (fputc('.', fout) == EOF) return END_WERROR;
715 case 4: /* After "\n.\r" (\n written, rest not) */
716 if (ch == '\n') return END_DOT;
719 if (fputs(".\n", fout) == EOF) return END_WERROR;
720 if (ch == '\r') { ch_state = 2; continue; }
726 if (fputc(ch, fout) == EOF) return END_WERROR;
727 if (++message_size > thismessage_size_limit) return END_SIZE;
730 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
731 the message ends with a newline, and we must also write any characters that
732 were saved up while testing for an ending dot. */
736 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
737 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
738 message_size += Ustrlen(ends[ch_state]);
748 /*************************************************
749 * Read data portion of an SMTP message *
750 *************************************************/
752 /* This function is called to read the remainder of an SMTP message (after the
753 headers), or to skip over it when an error has occurred. In this case, the
754 output file is passed as NULL.
756 If any line begins with a dot, that character is skipped. The input should only
757 be successfully terminated by CR LF . CR LF unless it is local (non-network)
758 SMTP, in which case the CRs are optional, but...
760 FUDGE: It seems that sites on the net send out messages with just LF
761 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
762 we make the CRs optional in all cases.
764 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
765 well, so that there are no CRs in spooled messages. However, the message
766 terminating dot is not recognized between two bare CRs.
769 fout a FILE to which to write the message; NULL if skipping
771 Returns: One of the END_xxx values indicating why it stopped reading
775 read_message_data_smtp(FILE *fout)
781 while ((ch = (receive_getc)()) != EOF)
783 if (ch == 0) body_zerocount++;
786 case 0: /* After LF or CRLF */
790 continue; /* Don't ever write . after LF */
794 /* Else fall through to handle as normal uschar. */
796 case 1: /* Normal state */
801 if (linelength > max_received_linelength)
802 max_received_linelength = linelength;
812 case 2: /* After (unwritten) CR */
814 if (linelength > max_received_linelength)
815 max_received_linelength = linelength;
824 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
825 (void) cutthrough_put_nl();
826 if (ch != '\r') ch_state = 1; else continue;
830 case 3: /* After [CR] LF . */
838 /* The dot was removed at state 3. For a doubled dot, here, reinstate
839 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
840 and to file below. */
844 (void) cutthrough_puts(&c, 1);
849 case 4: /* After [CR] LF . CR */
850 if (ch == '\n') return END_DOT;
853 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
854 (void) cutthrough_put_nl();
864 /* Add the character to the spool file, unless skipping; then loop for the
871 if (fputc(ch, fout) == EOF) return END_WERROR;
872 if (message_size > thismessage_size_limit) return END_SIZE;
875 (void) cutthrough_put_nl();
879 (void) cutthrough_puts(&c, 1);
883 /* Fall through here if EOF encountered. This indicates some kind of error,
884 since a correct message is terminated by [CR] LF . [CR] LF. */
892 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
893 CHUNKING. We assume that the incoming has proper CRLF, so only have to scan
894 for and strip CR. On the downside there are more protocol reasons to stop.
897 fout a FILE to which to write the message; NULL if skipping
899 Returns: One of the END_xxx values indicating why it stopped reading
903 read_message_bdat_smtp(FILE *fout)
908 for (;;) switch (ch = bdat_getc())
910 case EOF: return END_EOF;
911 case EOD: return END_DOT;
912 case ERR: return END_PROTOCOL;
916 if (linelength > max_received_linelength)
917 max_received_linelength = linelength;
929 if (fputc(ch, fout) == EOF) return END_WERROR;
930 if (message_size > thismessage_size_limit) return END_SIZE;
934 (void) cutthrough_put_nl();
938 (void) cutthrough_puts(&c, 1);
949 /*************************************************
950 * Swallow SMTP message *
951 *************************************************/
953 /* This function is called when there has been some kind of error while reading
954 an SMTP message, and the remaining data may need to be swallowed. It is global
955 because it is called from smtp_closedown() to shut down an incoming call
958 Argument: a FILE from which to read the message
963 receive_swallow_smtp(void)
965 /*XXX CHUNKING: not enough. read chunks until RSET? */
966 if (message_ended >= END_NOTENDED)
967 message_ended = read_message_data_smtp(NULL);
972 /*************************************************
973 * Handle lost SMTP connection *
974 *************************************************/
976 /* This function logs connection loss incidents and generates an appropriate
979 Argument: additional data for the message
980 Returns: the SMTP response
984 handle_lost_connection(uschar *s)
986 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
987 "%s lost while reading message data%s", smtp_get_connection_info(), s);
988 return US"421 Lost incoming connection";
994 /*************************************************
995 * Handle a non-smtp reception error *
996 *************************************************/
998 /* This function is called for various errors during the reception of non-SMTP
999 messages. It either sends a message to the sender of the problem message, or it
1000 writes to the standard error stream.
1003 errcode code for moan_to_sender(), identifying the error
1004 text1 first message text, passed to moan_to_sender()
1005 text2 second message text, used only for stderrr
1006 error_rc code to pass to exim_exit if no problem
1007 f FILE containing body of message (may be stdin)
1008 hptr pointer to instore headers or NULL
1010 Returns: calls exim_exit(), which does not return
1014 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1015 FILE *f, header_line *hptr)
1017 if (error_handling == ERRORS_SENDER)
1021 eblock.text1 = text1;
1022 eblock.text2 = US"";
1023 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1024 error_rc = EXIT_FAILURE;
1027 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1029 exim_exit(error_rc);
1034 /*************************************************
1035 * Add header lines set up by ACL *
1036 *************************************************/
1038 /* This function is called to add the header lines that were set up by
1039 statements in an ACL to the list of headers in memory. It is done in two stages
1040 like this, because when the ACL for RCPT is running, the other headers have not
1041 yet been received. This function is called twice; once just before running the
1042 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1043 are visible to the DATA ACL.
1045 Originally these header lines were added at the end. Now there is support for
1046 three different places: top, bottom, and after the Received: header(s). There
1047 will always be at least one Received: header, even if it is marked deleted, and
1048 even if something else has been put in front of it.
1051 acl_name text to identify which ACL
1057 add_acl_headers(int where, uschar *acl_name)
1059 header_line *h, *next;
1060 header_line *last_received = NULL;
1064 case ACL_WHERE_DKIM:
1065 case ACL_WHERE_MIME:
1066 case ACL_WHERE_DATA:
1067 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1069 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1070 " will not take effect on cutthrough deliveries");
1075 if (acl_removed_headers != NULL)
1077 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1079 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1081 const uschar * list = acl_removed_headers;
1082 int sep = ':'; /* This is specified as a colon-separated list */
1086 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1087 if (header_testname(h, s, Ustrlen(s), FALSE))
1089 h->type = htype_old;
1090 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1093 acl_removed_headers = NULL;
1094 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1097 if (acl_added_headers == NULL) return;
1098 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1100 for (h = acl_added_headers; h != NULL; h = next)
1107 h->next = header_list;
1109 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1113 if (last_received == NULL)
1115 last_received = header_list;
1116 while (!header_testname(last_received, US"Received", 8, FALSE))
1117 last_received = last_received->next;
1118 while (last_received->next != NULL &&
1119 header_testname(last_received->next, US"Received", 8, FALSE))
1120 last_received = last_received->next;
1122 h->next = last_received->next;
1123 last_received->next = h;
1124 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1128 /* add header before any header which is NOT Received: or Resent- */
1129 last_received = header_list;
1130 while ( (last_received->next != NULL) &&
1131 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1132 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1133 last_received = last_received->next;
1134 /* last_received now points to the last Received: or Resent-* header
1135 in an uninterrupted chain of those header types (seen from the beginning
1136 of all headers. Our current header must follow it. */
1137 h->next = last_received->next;
1138 last_received->next = h;
1139 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1144 header_last->next = h;
1148 if (h->next == NULL) header_last = h;
1150 /* Check for one of the known header types (From:, To:, etc.) though in
1151 practice most added headers are going to be "other". Lower case
1152 identification letters are never stored with the header; they are used
1153 for existence tests when messages are received. So discard any lower case
1156 h->type = header_checkname(h, FALSE);
1157 if (h->type >= 'a') h->type = htype_other;
1159 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1162 acl_added_headers = NULL;
1163 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1168 /*************************************************
1169 * Add host information for log line *
1170 *************************************************/
1172 /* Called for acceptance and rejecting log lines. This adds information about
1173 the calling host to a string that is being built dynamically.
1176 s the dynamic string
1177 sizeptr points to the size variable
1178 ptrptr points to the pointer variable
1180 Returns: the extended string
1184 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1186 if (sender_fullhost)
1188 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1189 s = string_cat(s, sizeptr, ptrptr, US" DS");
1190 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1191 if (LOGGING(incoming_interface) && interface_address != NULL)
1193 s = string_cat(s, sizeptr, ptrptr,
1194 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1197 if (sender_ident != NULL)
1198 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1199 if (received_protocol != NULL)
1200 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1206 #ifdef WITH_CONTENT_SCAN
1208 /*************************************************
1209 * Run the MIME ACL on a message *
1210 *************************************************/
1212 /* This code is in a subroutine so that it can be used for both SMTP
1213 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1216 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1217 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1218 smtp_reply_ptr Where SMTP reply is being built
1219 blackholed_by_ptr Where "blackholed by" message is being built
1221 Returns: TRUE to carry on; FALSE to abandon the message
1225 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1226 uschar **blackholed_by_ptr)
1229 uschar rfc822_file_path[2048];
1230 unsigned long mbox_size;
1231 header_line *my_headerlist;
1232 uschar *user_msg, *log_msg;
1233 int mime_part_count_buffer = -1;
1236 memset(CS rfc822_file_path,0,2048);
1238 /* check if it is a MIME message */
1239 my_headerlist = header_list;
1240 while (my_headerlist != NULL)
1242 /* skip deleted headers */
1243 if (my_headerlist->type == '*')
1245 my_headerlist = my_headerlist->next;
1248 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1250 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1253 my_headerlist = my_headerlist->next;
1256 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1260 /* make sure the eml mbox file is spooled up */
1261 mbox_file = spool_mbox(&mbox_size, NULL);
1262 if (mbox_file == NULL) {
1263 /* error while spooling */
1264 log_write(0, LOG_MAIN|LOG_PANIC,
1265 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1266 Uunlink(spool_name);
1268 #ifdef EXPERIMENTAL_DCC
1271 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1272 message_id[0] = 0; /* Indicate no message accepted */
1273 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1274 return FALSE; /* Indicate skip to end of receive function */
1280 mime_part_count = -1;
1281 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1282 (void)fclose(mbox_file);
1284 if (Ustrlen(rfc822_file_path) > 0)
1286 mime_part_count = mime_part_count_buffer;
1288 if (unlink(CS rfc822_file_path) == -1)
1290 log_write(0, LOG_PANIC,
1291 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1296 /* check if we must check any message/rfc822 attachments */
1299 uschar temp_path[1024];
1300 struct dirent * entry;
1303 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1304 spool_directory, message_id);
1306 tempdir = opendir(CS temp_path);
1309 if (!(entry = readdir(tempdir)))
1311 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1313 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1314 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1315 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1324 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1326 /* set RFC822 expansion variable */
1328 mime_part_count_buffer = mime_part_count;
1329 goto MIME_ACL_CHECK;
1331 log_write(0, LOG_PANIC,
1332 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1333 unlink(CS rfc822_file_path);
1338 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1341 recipients_count = 0;
1342 *blackholed_by_ptr = US"MIME ACL";
1346 Uunlink(spool_name);
1348 #ifdef EXPERIMENTAL_DCC
1352 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1354 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1355 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1357 message_id[0] = 0; /* Indicate no message accepted */
1358 return FALSE; /* Cause skip to end of receive function */
1364 #endif /* WITH_CONTENT_SCAN */
1369 received_header_gen(void)
1373 header_line *received_header= header_list;
1375 timestamp = expand_string(US"${tod_full}");
1376 if (recipients_count == 1) received_for = recipients_list[0].address;
1377 received = expand_string(received_header_text);
1378 received_for = NULL;
1382 if(spool_name[0] != 0)
1383 Uunlink(spool_name); /* Lose the data file */
1384 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1385 "(received_header_text) failed: %s", string_printing(received_header_text),
1386 expand_string_message);
1389 /* The first element on the header chain is reserved for the Received header,
1390 so all we have to do is fill in the text pointer, and set the type. However, if
1391 the result of the expansion is an empty string, we leave the header marked as
1392 "old" so as to refrain from adding a Received header. */
1394 if (received[0] == 0)
1396 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1397 received_header->type = htype_old;
1401 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1402 received_header->type = htype_received;
1405 received_header->slen = Ustrlen(received_header->text);
1407 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1408 received_header->type, received_header->text);
1413 /*************************************************
1415 *************************************************/
1417 /* Receive a message on the given input, and put it into a pair of spool files.
1418 Either a non-null list of recipients, or the extract flag will be true, or
1419 both. The flag sender_local is true for locally generated messages. The flag
1420 submission_mode is true if an ACL has obeyed "control = submission". The flag
1421 suppress_local_fixups is true if an ACL has obeyed "control =
1422 suppress_local_fixups" or -G was passed on the command-line.
1423 The flag smtp_input is true if the message is to be
1424 handled using SMTP conventions about termination and lines starting with dots.
1425 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1427 If a message was successfully read, message_id[0] will be non-zero.
1429 The general actions of this function are:
1431 . Read the headers of the message (if any) into a chain of store
1434 . If there is a "sender:" header and the message is locally originated,
1435 throw it away, unless the caller is trusted, or unless
1436 active_local_sender_retain is set - which can only happen if
1437 active_local_from_check is false.
1439 . If recipients are to be extracted from the message, build the
1440 recipients list from the headers, removing any that were on the
1441 original recipients list (unless extract_addresses_remove_arguments is
1442 false), and at the same time, remove any bcc header that may be present.
1444 . Get the spool file for the data, sort out its unique name, open
1445 and lock it (but don't give it the name yet).
1447 . Generate a "Message-Id" header if the message doesn't have one, for
1448 locally-originated messages.
1450 . Generate a "Received" header.
1452 . Ensure the recipients list is fully qualified and rewritten if necessary.
1454 . If there are any rewriting rules, apply them to the sender address
1455 and also to the headers.
1457 . If there is no from: header, generate one, for locally-generated messages
1458 and messages in "submission mode" only.
1460 . If the sender is local, check that from: is correct, and if not, generate
1461 a Sender: header, unless message comes from a trusted caller, or this
1462 feature is disabled by active_local_from_check being false.
1464 . If there is no "date" header, generate one, for locally-originated
1465 or submission mode messages only.
1467 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1468 dot_ends mode, to the data file. Leave it open, to hold the lock.
1470 . Write the envelope and the headers to a new file.
1472 . Set the name for the header file; close it.
1474 . Set the name for the data file; close it.
1476 Because this function can potentially be called many times in a single
1477 SMTP connection, all store should be got by store_get(), so that it will be
1478 automatically retrieved after the message is accepted.
1480 FUDGE: It seems that sites on the net send out messages with just LF
1481 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1482 we make the CRs optional in all cases.
1484 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1485 new regime is now in place in which bare CRs in header lines are turned into LF
1486 followed by a space, so as not to terminate the header line.
1488 February 2004: A bare LF in a header line in a message whose first line was
1489 terminated by CRLF is treated in the same way as a bare CR.
1492 extract_recip TRUE if recipients are to be extracted from the message's
1495 Returns: TRUE there are more messages to be read (SMTP input)
1496 FALSE there are no more messages to be read (non-SMTP input
1497 or SMTP connection collapsed, or other failure)
1499 When reading a message for filter testing, the returned value indicates
1500 whether the headers (which is all that is read) were terminated by '.' or
1504 receive_msg(BOOL extract_recip)
1509 int process_info_len = Ustrlen(process_info);
1510 int error_rc = (error_handling == ERRORS_SENDER)?
1511 errors_sender_rc : EXIT_FAILURE;
1512 int header_size = 256;
1513 int start, end, domain, size, sptr;
1516 int prevlines_length = 0;
1518 register int ptr = 0;
1520 BOOL contains_resent_headers = FALSE;
1521 BOOL extracted_ignored = FALSE;
1522 BOOL first_line_ended_crlf = TRUE_UNSET;
1523 BOOL smtp_yield = TRUE;
1526 BOOL resents_exist = FALSE;
1527 uschar *resent_prefix = US"";
1528 uschar *blackholed_by = NULL;
1529 uschar *blackhole_log_msg = US"";
1530 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1533 error_block *bad_addresses = NULL;
1535 uschar *frozen_by = NULL;
1536 uschar *queued_by = NULL;
1539 struct stat statbuf;
1541 /* Final message to give to SMTP caller, and messages from ACLs */
1543 uschar *smtp_reply = NULL;
1544 uschar *user_msg, *log_msg;
1546 /* Working header pointers */
1548 header_line *h, *next;
1550 /* Flags for noting the existence of certain headers (only one left) */
1552 BOOL date_header_exists = FALSE;
1554 /* Pointers to receive the addresses of headers whose contents we need. */
1556 header_line *from_header = NULL;
1557 header_line *subject_header = NULL;
1558 header_line *msgid_header = NULL;
1559 header_line *received_header;
1561 #ifdef EXPERIMENTAL_DMARC
1563 #endif /* EXPERIMENTAL_DMARC */
1565 /* Variables for use when building the Received: header. */
1570 /* Release any open files that might have been cached while preparing to
1571 accept the message - e.g. by verifying addresses - because reading a message
1572 might take a fair bit of real time. */
1576 /* Extracting the recipient list from an input file is incompatible with
1577 cutthrough delivery with the no-spool option. It shouldn't be possible
1578 to set up the combination, but just in case kill any ongoing connection. */
1579 if (extract_recip || !smtp_input)
1580 cancel_cutthrough_connection("not smtp input");
1582 /* Initialize the chain of headers by setting up a place-holder for Received:
1583 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1584 pointing to the end of the chain to make adding headers simple. */
1586 received_header = header_list = header_last = store_get(sizeof(header_line));
1587 header_list->next = NULL;
1588 header_list->type = htype_old;
1589 header_list->text = NULL;
1590 header_list->slen = 0;
1592 /* Control block for the next header to be read. */
1594 next = store_get(sizeof(header_line));
1595 next->text = store_get(header_size);
1597 /* Initialize message id to be null (indicating no message read), and the
1598 header names list to be the normal list. Indicate there is no data file open
1599 yet, initialize the size and warning count, and deal with no size limit. */
1607 received_count = 1; /* For the one we will add */
1609 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1611 /* While reading the message, the following counts are computed. */
1613 message_linecount = body_linecount = body_zerocount =
1614 max_received_linelength = 0;
1616 #ifndef DISABLE_DKIM
1617 /* Call into DKIM to set up the context. */
1618 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1621 #ifdef EXPERIMENTAL_DMARC
1622 /* initialize libopendmarc */
1623 dmarc_up = dmarc_init();
1626 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1627 ids, and fractions of a second are required. See the comments that precede the
1628 message id creation below. */
1630 (void)gettimeofday(&message_id_tv, NULL);
1632 /* For other uses of the received time we can operate with granularity of one
1633 second, and for that we use the global variable received_time. This is for
1634 things like ultimate message timeouts. */
1636 received_time = message_id_tv.tv_sec;
1638 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1639 happen in the smtp_getc() function when it refills its buffer. */
1641 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1643 /* If not SMTP input, timeout happens only if configured, and we just set a
1644 single timeout for the whole message. */
1646 else if (receive_timeout > 0)
1648 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1649 alarm(receive_timeout);
1652 /* SIGTERM and SIGINT are caught always. */
1654 signal(SIGTERM, data_sigterm_sigint_handler);
1655 signal(SIGINT, data_sigterm_sigint_handler);
1657 /* Header lines in messages are not supposed to be very long, though when
1658 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1659 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1660 storing the header, and extend this as necessary using string_cat().
1662 To cope with total lunacies, impose an upper limit on the length of the header
1663 section of the message, as otherwise the store will fill up. We must also cope
1664 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1665 Folded header lines are joined into one string, leaving the '\n' characters
1666 inside them, so that writing them out reproduces the input.
1668 Loop for each character of each header; the next structure for chaining the
1669 header is set up already, with ptr the offset of the next character in
1674 int ch = (receive_getc)();
1676 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1677 SMTP must have a correct "." terminator. */
1679 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1681 smtp_reply = handle_lost_connection(US" (header)");
1683 goto TIDYUP; /* Skip to end of function */
1686 /* See if we are at the current header's size limit - there must be at least
1687 four bytes left. This allows for the new character plus a zero, plus two for
1688 extra insertions when we are playing games with dots and carriage returns. If
1689 we are at the limit, extend the text buffer. This could have been done
1690 automatically using string_cat() but because this is a tightish loop storing
1691 only one character at a time, we choose to do it inline. Normally
1692 store_extend() will be able to extend the block; only at the end of a big
1693 store block will a copy be needed. To handle the case of very long headers
1694 (and sometimes lunatic messages can have ones that are 100s of K long) we
1695 call store_release() for strings that have been copied - if the string is at
1696 the start of a block (and therefore the only thing in it, because we aren't
1697 doing any other gets), the block gets freed. We can only do this because we
1698 know there are no other calls to store_get() going on. */
1700 if (ptr >= header_size - 4)
1702 int oldsize = header_size;
1703 /* header_size += 256; */
1705 if (!store_extend(next->text, oldsize, header_size))
1707 uschar *newtext = store_get(header_size);
1708 memcpy(newtext, next->text, ptr);
1709 store_release(next->text);
1710 next->text = newtext;
1714 /* Cope with receiving a binary zero. There is dispute about whether
1715 these should be allowed in RFC 822 messages. The middle view is that they
1716 should not be allowed in headers, at least. Exim takes this attitude at
1717 the moment. We can't just stomp on them here, because we don't know that
1718 this line is a header yet. Set a flag to cause scanning later. */
1720 if (ch == 0) had_zero++;
1722 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1723 those from data files use just LF. Treat LF in local SMTP input as a
1724 terminator too. Treat EOF as a line terminator always. */
1726 if (ch == EOF) goto EOL;
1728 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1729 other MTAs accept this. We are therefore forced into this "liberalisation"
1730 too, so we accept LF as a line terminator whatever the source of the message.
1731 However, if the first line of the message ended with a CRLF, we treat a bare
1732 LF specially by inserting a white space after it to ensure that the header
1733 line is not terminated. */
1737 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1738 else if (first_line_ended_crlf) receive_ungetc(' ');
1742 /* This is not the end of the line. If this is SMTP input and this is
1743 the first character in the line and it is a "." character, ignore it.
1744 This implements the dot-doubling rule, though header lines starting with
1745 dots aren't exactly common. They are legal in RFC 822, though. If the
1746 following is CRLF or LF, this is the line that that terminates the
1747 entire message. We set message_ended to indicate this has happened (to
1748 prevent further reading), and break out of the loop, having freed the
1749 empty header, and set next = NULL to indicate no data line. */
1751 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1753 ch = (receive_getc)();
1756 ch = (receive_getc)();
1760 ch = '\r'; /* Revert to CR */
1765 message_ended = END_DOT;
1768 break; /* End character-reading loop */
1771 /* For non-SMTP input, the dot at the start of the line was really a data
1772 character. What is now in ch is the following character. We guaranteed
1773 enough space for this above. */
1777 next->text[ptr++] = '.';
1782 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1783 remember this case if this is the first line ending. */
1787 ch = (receive_getc)();
1790 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1794 /* Otherwise, put back the character after CR, and turn the bare CR
1797 ch = (receive_ungetc)(ch);
1798 next->text[ptr++] = '\n';
1803 /* We have a data character for the header line. */
1805 next->text[ptr++] = ch; /* Add to buffer */
1806 message_size++; /* Total message size so far */
1808 /* Handle failure due to a humungously long header section. The >= allows
1809 for the terminating \n. Add what we have so far onto the headers list so
1810 that it gets reflected in any error message, and back up the just-read
1813 if (message_size >= header_maxsize)
1815 next->text[ptr] = 0;
1817 next->type = htype_other;
1819 header_last->next = next;
1822 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1823 "%s (more than %d characters): message abandoned",
1824 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1828 smtp_reply = US"552 Message header is ridiculously long";
1829 receive_swallow_smtp();
1830 goto TIDYUP; /* Skip to end of function */
1835 give_local_error(ERRMESS_VLONGHEADER,
1836 string_sprintf("message header longer than %d characters received: "
1837 "message not accepted", header_maxsize), US"", error_rc, stdin,
1839 /* Does not return */
1843 continue; /* With next input character */
1845 /* End of header line reached */
1849 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1851 receive_linecount++;
1852 message_linecount++;
1854 /* Keep track of maximum line length */
1856 if (ptr - prevlines_length > max_received_linelength)
1857 max_received_linelength = ptr - prevlines_length;
1858 prevlines_length = ptr + 1;
1860 /* Now put in the terminating newline. There is always space for
1861 at least two more characters. */
1863 next->text[ptr++] = '\n';
1866 /* A blank line signals the end of the headers; release the unwanted
1867 space and set next to NULL to indicate this. */
1876 /* There is data in the line; see if the next input character is a
1877 whitespace character. If it is, we have a continuation of this header line.
1878 There is always space for at least one character at this point. */
1882 int nextch = (receive_getc)();
1883 if (nextch == ' ' || nextch == '\t')
1885 next->text[ptr++] = nextch;
1887 continue; /* Iterate the loop */
1889 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1890 else ch = EOF; /* Cause main loop to exit at end */
1893 /* We have got to the real line end. Terminate the string and release store
1894 beyond it. If it turns out to be a real header, internal binary zeros will
1895 be squashed later. */
1897 next->text[ptr] = 0;
1899 store_reset(next->text + ptr + 1);
1901 /* Check the running total size against the overall message size limit. We
1902 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1903 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1904 headers - the code to read the body will then also hit the buffer. */
1906 if (message_size > thismessage_size_limit) break;
1908 /* A line that is not syntactically correct for a header also marks
1909 the end of the headers. In this case, we leave next containing the
1910 first data line. This might actually be several lines because of the
1911 continuation logic applied above, but that doesn't matter.
1913 It turns out that smail, and presumably sendmail, accept leading lines
1916 From ph10 Fri Jan 5 12:35 GMT 1996
1918 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1919 find any documentation of this, but for compatibility it had better be
1920 accepted. Exim restricts it to the case of non-smtp messages, and
1921 treats it as an alternative to the -f command line option. Thus it is
1922 ignored except for trusted users or filter testing. Otherwise it is taken
1923 as the sender address, unless -f was used (sendmail compatibility).
1925 It further turns out that some UUCPs generate the From_line in a different
1928 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1930 The regex for matching these things is now capable of recognizing both
1931 formats (including 2- and 4-digit years in the latter). In fact, the regex
1932 is now configurable, as is the expansion string to fish out the sender.
1934 Even further on it has been discovered that some broken clients send
1935 these lines in SMTP messages. There is now an option to ignore them from
1936 specified hosts or networks. Sigh. */
1938 if (header_last == header_list &&
1941 (sender_host_address != NULL &&
1942 verify_check_host(&ignore_fromline_hosts) == OK)
1944 (sender_host_address == NULL && ignore_fromline_local)
1946 regex_match_and_setup(regex_From, next->text, 0, -1))
1948 if (!sender_address_forced)
1950 uschar *uucp_sender = expand_string(uucp_from_sender);
1951 if (uucp_sender == NULL)
1953 log_write(0, LOG_MAIN|LOG_PANIC,
1954 "expansion of \"%s\" failed after matching "
1955 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1959 int start, end, domain;
1961 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1962 &start, &end, &domain, TRUE);
1963 if (newsender != NULL)
1965 if (domain == 0 && newsender[0] != 0)
1966 newsender = rewrite_address_qualify(newsender, FALSE);
1968 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1970 sender_address = newsender;
1972 if (trusted_caller || filter_test != FTEST_NONE)
1974 authenticated_sender = NULL;
1975 originator_name = US"";
1976 sender_local = FALSE;
1979 if (filter_test != FTEST_NONE)
1980 printf("Sender taken from \"From \" line\n");
1987 /* Not a leading "From " line. Check to see if it is a valid header line.
1988 Header names may contain any non-control characters except space and colon,
1993 uschar *p = next->text;
1995 /* If not a valid header line, break from the header reading loop, leaving
1996 next != NULL, indicating that it holds the first line of the body. */
1998 if (isspace(*p)) break;
1999 while (mac_isgraph(*p) && *p != ':') p++;
2000 while (isspace(*p)) p++;
2003 body_zerocount = had_zero;
2007 /* We have a valid header line. If there were any binary zeroes in
2008 the line, stomp on them here. */
2011 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2013 /* It is perfectly legal to have an empty continuation line
2014 at the end of a header, but it is confusing to humans
2015 looking at such messages, since it looks like a blank line.
2016 Reduce confusion by removing redundant white space at the
2017 end. We know that there is at least one printing character
2018 (the ':' tested for above) so there is no danger of running
2021 p = next->text + ptr - 2;
2024 while (*p == ' ' || *p == '\t') p--;
2025 if (*p != '\n') break;
2026 ptr = (p--) - next->text + 1;
2027 message_size -= next->slen - ptr;
2028 next->text[ptr] = 0;
2032 /* Add the header to the chain */
2034 next->type = htype_other;
2036 header_last->next = next;
2039 /* Check the limit for individual line lengths. This comes after adding to
2040 the chain so that the failing line is reflected if a bounce is generated
2041 (for a local message). */
2043 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2045 log_write(0, LOG_MAIN, "overlong message header line received from "
2046 "%s (more than %d characters): message abandoned",
2047 sender_host_unknown? sender_ident : sender_fullhost,
2048 header_line_maxsize);
2052 smtp_reply = US"552 A message header line is too long";
2053 receive_swallow_smtp();
2054 goto TIDYUP; /* Skip to end of function */
2059 give_local_error(ERRMESS_VLONGHDRLINE,
2060 string_sprintf("message header line longer than %d characters "
2061 "received: message not accepted", header_line_maxsize), US"",
2062 error_rc, stdin, header_list->next);
2063 /* Does not return */
2067 /* Note if any resent- fields exist. */
2069 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2071 resents_exist = TRUE;
2072 resent_prefix = US"Resent-";
2076 /* The line has been handled. If we have hit EOF, break out of the loop,
2077 indicating no pending data line. */
2079 if (ch == EOF) { next = NULL; break; }
2081 /* Set up for the next header */
2084 next = store_get(sizeof(header_line));
2085 next->text = store_get(header_size);
2088 prevlines_length = 0;
2089 } /* Continue, starting to read the next header */
2091 /* At this point, we have read all the headers into a data structure in main
2092 store. The first header is still the dummy placeholder for the Received: header
2093 we are going to generate a bit later on. If next != NULL, it contains the first
2094 data line - which terminated the headers before reaching a blank line (not the
2099 debug_printf(">>Headers received:\n");
2100 for (h = header_list->next; h != NULL; h = h->next)
2101 debug_printf("%s", h->text);
2105 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2106 is dropped immediately after valid headers, the next thing we will see is EOF.
2107 We must test for this specially, as further down the reading of the data is
2108 skipped if already at EOF. */
2110 if (smtp_input && (receive_feof)())
2112 smtp_reply = handle_lost_connection(US" (after header)");
2114 goto TIDYUP; /* Skip to end of function */
2117 /* If this is a filter test run and no headers were read, output a warning
2118 in case there is a mistake in the test message. */
2120 if (filter_test != FTEST_NONE && header_list->next == NULL)
2121 printf("Warning: no message headers read\n");
2124 /* Scan the headers to identify them. Some are merely marked for later
2125 processing; some are dealt with here. */
2127 for (h = header_list->next; h != NULL; h = h->next)
2129 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2130 if (is_resent) contains_resent_headers = TRUE;
2132 switch (header_checkname(h, is_resent))
2135 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2139 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2142 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2145 if (!resents_exist || is_resent) date_header_exists = TRUE;
2148 /* Same comments as about Return-Path: below. */
2150 case htype_delivery_date:
2151 if (delivery_date_remove) h->type = htype_old;
2154 /* Same comments as about Return-Path: below. */
2156 case htype_envelope_to:
2157 if (envelope_to_remove) h->type = htype_old;
2160 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2161 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2162 header consists of just the login id of the user who called Exim, rewrite
2163 it with the gecos field first. Apply this rule to Resent-From: if there
2164 are resent- fields. */
2167 h->type = htype_from;
2168 if (!resents_exist || is_resent)
2174 uschar *s = Ustrchr(h->text, ':') + 1;
2175 while (isspace(*s)) s++;
2176 len = h->slen - (s - h->text) - 1;
2177 if (Ustrlen(originator_login) == len &&
2178 strncmpic(s, originator_login, len) == 0)
2180 uschar *name = is_resent? US"Resent-From" : US"From";
2181 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2182 originator_login, qualify_domain_sender);
2183 from_header = header_last;
2184 h->type = htype_old;
2185 DEBUG(D_receive|D_rewrite)
2186 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2192 /* Identify the Message-id: header for generating "in-reply-to" in the
2193 autoreply transport. For incoming logging, save any resent- value. In both
2194 cases, take just the first of any multiples. */
2197 if (msgid_header == NULL && (!resents_exist || is_resent))
2204 /* Flag all Received: headers */
2206 case htype_received:
2207 h->type = htype_received;
2211 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2213 case htype_reply_to:
2214 h->type = htype_reply_to;
2217 /* The Return-path: header is supposed to be added to messages when
2218 they leave the SMTP system. We shouldn't receive messages that already
2219 contain Return-path. However, since Exim generates Return-path: on
2220 local delivery, resent messages may well contain it. We therefore
2221 provide an option (which defaults on) to remove any Return-path: headers
2222 on input. Removal actually means flagging as "old", which prevents the
2223 header being transmitted with the message. */
2225 case htype_return_path:
2226 if (return_path_remove) h->type = htype_old;
2228 /* If we are testing a mail filter file, use the value of the
2229 Return-Path: header to set up the return_path variable, which is not
2230 otherwise set. However, remove any <> that surround the address
2231 because the variable doesn't have these. */
2233 if (filter_test != FTEST_NONE)
2235 uschar *start = h->text + 12;
2236 uschar *end = start + Ustrlen(start);
2237 while (isspace(*start)) start++;
2238 while (end > start && isspace(end[-1])) end--;
2239 if (*start == '<' && end[-1] == '>')
2244 return_path = string_copyn(start, end - start);
2245 printf("Return-path taken from \"Return-path:\" header line\n");
2249 /* If there is a "Sender:" header and the message is locally originated,
2250 and from an untrusted caller and suppress_local_fixups is not set, or if we
2251 are in submission mode for a remote message, mark it "old" so that it will
2252 not be transmitted with the message, unless active_local_sender_retain is
2253 set. (This can only be true if active_local_from_check is false.) If there
2254 are any resent- headers in the message, apply this rule to Resent-Sender:
2255 instead of Sender:. Messages with multiple resent- header sets cannot be
2256 tidily handled. (For this reason, at least one MUA - Pine - turns old
2257 resent- headers into X-resent- headers when resending, leaving just one
2261 h->type = ((!active_local_sender_retain &&
2263 (sender_local && !trusted_caller && !suppress_local_fixups)
2267 (!resents_exist||is_resent))?
2268 htype_old : htype_sender;
2271 /* Remember the Subject: header for logging. There is no Resent-Subject */
2277 /* "To:" gets flagged, and the existence of a recipient header is noted,
2278 whether it's resent- or not. */
2283 to_or_cc_header_exists = TRUE;
2289 /* Extract recipients from the headers if that is required (the -t option).
2290 Note that this is documented as being done *before* any address rewriting takes
2291 place. There are two possibilities:
2293 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2294 recipients already listed are to be REMOVED from the message. Smail 3 works
2295 like this. We need to build a non-recipients tree for that list, because in
2296 subsequent processing this data is held in a tree and that's what the
2297 spool_write_header() function expects. Make sure that non-recipient addresses
2298 are fully qualified and rewritten if necessary.
2300 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2301 those in the command line arguments (and it is rumoured some other MTAs do
2302 this). Therefore, there is an option to make Exim behave this way.
2304 *** Notes on "Resent-" header lines ***
2306 The presence of resent-headers in the message makes -t horribly ambiguous.
2307 Experiments with sendmail showed that it uses recipients for all resent-
2308 headers, totally ignoring the concept of "sets of resent- headers" as described
2309 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2310 with all the addresses in one instance of each header.
2312 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2313 error for -t if there were resent- headers in the message. However, after a
2314 discussion on the mailing list, I've learned that there are MUAs that use
2315 resent- headers with -t, and also that the stuff about sets of resent- headers
2316 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2317 message with -t and resent- header lines makes sure that only *its* resent-
2318 headers are present; previous ones are often renamed as X-resent- for example.
2320 Consequently, Exim has been changed so that, if any resent- header lines are
2321 present, the recipients are taken from all of the appropriate resent- lines,
2322 and not from the ordinary To:, Cc:, etc. */
2327 error_block **bnext = &bad_addresses;
2329 if (extract_addresses_remove_arguments)
2331 while (recipients_count-- > 0)
2333 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2334 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2335 tree_add_nonrecipient(s);
2337 recipients_list = NULL;
2338 recipients_count = recipients_list_max = 0;
2341 /* Now scan the headers */
2343 for (h = header_list->next; h != NULL; h = h->next)
2345 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2346 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2348 uschar *s = Ustrchr(h->text, ':') + 1;
2349 while (isspace(*s)) s++;
2351 parse_allow_group = TRUE; /* Allow address group syntax */
2355 uschar *ss = parse_find_address_end(s, FALSE);
2356 uschar *recipient, *errmess, *p, *pp;
2357 int start, end, domain;
2359 /* Check on maximum */
2361 if (recipients_max > 0 && ++rcount > recipients_max)
2363 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2364 US"message rejected: ", error_rc, stdin, NULL);
2365 /* Does not return */
2368 /* Make a copy of the address, and remove any internal newlines. These
2369 may be present as a result of continuations of the header line. The
2370 white space that follows the newline must not be removed - it is part
2373 pp = recipient = store_get(ss - s + 1);
2374 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2379 BOOL b = allow_utf8_domains;
2380 allow_utf8_domains = TRUE;
2382 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2386 if (string_is_utf8(recipient))
2387 message_smtputf8 = TRUE;
2389 allow_utf8_domains = b;
2393 /* Keep a list of all the bad addresses so we can send a single
2394 error message at the end. However, an empty address is not an error;
2395 just ignore it. This can come from an empty group list like
2397 To: Recipients of list:;
2399 If there are no recipients at all, an error will occur later. */
2401 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2403 int len = Ustrlen(s);
2404 error_block *b = store_get(sizeof(error_block));
2405 while (len > 0 && isspace(s[len-1])) len--;
2407 b->text1 = string_printing(string_copyn(s, len));
2413 /* If the recipient is already in the nonrecipients tree, it must
2414 have appeared on the command line with the option extract_addresses_
2415 remove_arguments set. Do not add it to the recipients, and keep a note
2416 that this has happened, in order to give a better error if there are
2417 no recipients left. */
2419 else if (recipient != NULL)
2421 if (tree_search(tree_nonrecipients, recipient) == NULL)
2422 receive_add_recipient(recipient, -1);
2424 extracted_ignored = TRUE;
2427 /* Move on past this address */
2429 s = ss + (*ss? 1:0);
2430 while (isspace(*s)) s++;
2431 } /* Next address */
2433 parse_allow_group = FALSE; /* Reset group syntax flags */
2434 parse_found_group = FALSE;
2436 /* If this was the bcc: header, mark it "old", which means it
2437 will be kept on the spool, but not transmitted as part of the
2440 if (h->type == htype_bcc) h->type = htype_old;
2441 } /* For appropriate header line */
2442 } /* For each header line */
2446 /* Now build the unique message id. This has changed several times over the
2447 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2448 Retaining all the history in the comment has become too unwieldy - read
2449 previous release sources if you want it.
2451 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2452 The first part is the current time, in seconds. The second part is the current
2453 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2454 can hold a number in the range 0-3843. It used to be a computed sequence
2455 number, but is now the fractional component of the current time in units of
2456 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2457 received, Exim ensures that the timer has ticked at the appropriate level
2458 before proceeding, to avoid duplication if the pid happened to be re-used
2459 within the same time period. It seems likely that most messages will take at
2460 least half a millisecond to be received, so no delay will normally be
2461 necessary. At least for some time...
2463 There is a modification when localhost_number is set. Formerly this was allowed
2464 to be as large as 255. Now it is restricted to the range 0-16, and the final
2465 component of the message id becomes (localhost_number * 200) + fractional time
2466 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2468 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2469 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2470 still allows the tttttt field to hold a large enough number to last for some
2471 more decades, and the final two-digit field can hold numbers up to 1295, which
2472 is enough for milliseconds (instead of 1/2000 of a second).
2474 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2475 pid, so it is probably safe because pids have to be positive. The
2476 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2477 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2479 Note that string_base62() returns its data in a static storage block, so it
2480 must be copied before calling string_base62() again. It always returns exactly
2483 There doesn't seem to be anything in the RFC which requires a message id to
2484 start with a letter, but Smail was changed to ensure this. The external form of
2485 the message id (as supplied by string expansion) therefore starts with an
2486 additional leading 'E'. The spool file names do not include this leading
2487 letter and it is not used internally.
2489 NOTE: If ever the format of message ids is changed, the regular expression for
2490 checking that a string is in this format must be updated in a corresponding
2491 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2492 must also be changed to reflect the correct string length. Then, of course,
2493 other programs that rely on the message id format will need updating too. */
2495 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2496 message_id[6] = '-';
2497 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2499 /* Deal with the case where the host number is set. The value of the number was
2500 checked when it was read, to ensure it isn't too big. The timing granularity is
2501 left in id_resolution so that an appropriate wait can be done after receiving
2502 the message, if necessary (we hope it won't be). */
2504 if (host_number_string != NULL)
2506 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2507 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2508 string_base62((long int)(
2509 host_number * (1000000/id_resolution) +
2510 message_id_tv.tv_usec/id_resolution)) + 4);
2513 /* Host number not set: final field is just the fractional time at an
2514 appropriate resolution. */
2518 id_resolution = (BASE_62 == 62)? 500 : 1000;
2519 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2520 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2523 /* Add the current message id onto the current process info string if
2526 (void)string_format(process_info + process_info_len,
2527 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2529 /* If we are using multiple input directories, set up the one for this message
2530 to be the least significant base-62 digit of the time of arrival. Otherwise
2531 ensure that it is an empty string. */
2533 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2535 /* Now that we have the message-id, if there is no message-id: header, generate
2536 one, but only for local (without suppress_local_fixups) or submission mode
2537 messages. This can be user-configured if required, but we had better flatten
2538 any illegal characters therein. */
2540 if (msgid_header == NULL &&
2541 ((sender_host_address == NULL && !suppress_local_fixups)
2542 || submission_mode))
2545 uschar *id_text = US"";
2546 uschar *id_domain = primary_hostname;
2548 /* Permit only letters, digits, dots, and hyphens in the domain */
2550 if (message_id_domain != NULL)
2552 uschar *new_id_domain = expand_string(message_id_domain);
2553 if (new_id_domain == NULL)
2555 if (!expand_string_forcedfail)
2556 log_write(0, LOG_MAIN|LOG_PANIC,
2557 "expansion of \"%s\" (message_id_header_domain) "
2558 "failed: %s", message_id_domain, expand_string_message);
2560 else if (*new_id_domain != 0)
2562 id_domain = new_id_domain;
2563 for (p = id_domain; *p != 0; p++)
2564 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2568 /* Permit all characters except controls and RFC 2822 specials in the
2569 additional text part. */
2571 if (message_id_text != NULL)
2573 uschar *new_id_text = expand_string(message_id_text);
2574 if (new_id_text == NULL)
2576 if (!expand_string_forcedfail)
2577 log_write(0, LOG_MAIN|LOG_PANIC,
2578 "expansion of \"%s\" (message_id_header_text) "
2579 "failed: %s", message_id_text, expand_string_message);
2581 else if (*new_id_text != 0)
2583 id_text = new_id_text;
2584 for (p = id_text; *p != 0; p++)
2585 if (mac_iscntrl_or_special(*p)) *p = '-';
2589 /* Add the header line
2590 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2591 * appended, to preserve classical expectations of header ordering. */
2593 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2594 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2595 (*id_text == 0)? "" : ".", id_text, id_domain);
2598 /* If we are to log recipients, keep a copy of the raw ones before any possible
2599 rewriting. Must copy the count, because later ACLs and the local_scan()
2600 function may mess with the real recipients. */
2602 if (LOGGING(received_recipients))
2604 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2605 for (i = 0; i < recipients_count; i++)
2606 raw_recipients[i] = string_copy(recipients_list[i].address);
2607 raw_recipients_count = recipients_count;
2610 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2611 recipients will get here only if the conditions were right (allow_unqualified_
2612 recipient is TRUE). */
2614 for (i = 0; i < recipients_count; i++)
2615 recipients_list[i].address =
2616 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2617 global_rewrite_rules, rewrite_existflags);
2619 /* If there is no From: header, generate one for local (without
2620 suppress_local_fixups) or submission_mode messages. If there is no sender
2621 address, but the sender is local or this is a local delivery error, use the
2622 originator login. This shouldn't happen for genuine bounces, but might happen
2623 for autoreplies. The addition of From: must be done *before* checking for the
2624 possible addition of a Sender: header, because untrusted_set_sender allows an
2625 untrusted user to set anything in the envelope (which might then get info
2626 From:) but we still want to ensure a valid Sender: if it is required. */
2628 if (from_header == NULL &&
2629 ((sender_host_address == NULL && !suppress_local_fixups)
2630 || submission_mode))
2632 uschar *oname = US"";
2634 /* Use the originator_name if this is a locally submitted message and the
2635 caller is not trusted. For trusted callers, use it only if -F was used to
2636 force its value or if we have a non-SMTP message for which -f was not used
2637 to set the sender. */
2639 if (sender_host_address == NULL)
2641 if (!trusted_caller || sender_name_forced ||
2642 (!smtp_input && !sender_address_forced))
2643 oname = originator_name;
2646 /* For non-locally submitted messages, the only time we use the originator
2647 name is when it was forced by the /name= option on control=submission. */
2651 if (submission_name != NULL) oname = submission_name;
2654 /* Envelope sender is empty */
2656 if (sender_address[0] == 0)
2658 uschar *fromstart, *fromend;
2660 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2661 oname, (oname[0] == 0)? "" : " <");
2662 fromend = (oname[0] == 0)? US"" : US">";
2664 if (sender_local || local_error_message)
2666 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2667 local_part_quote(originator_login), qualify_domain_sender,
2670 else if (submission_mode && authenticated_id != NULL)
2672 if (submission_domain == NULL)
2674 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2675 local_part_quote(authenticated_id), qualify_domain_sender,
2678 else if (submission_domain[0] == 0) /* empty => whole address set */
2680 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2685 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2686 local_part_quote(authenticated_id), submission_domain,
2689 from_header = header_last; /* To get it checked for Sender: */
2693 /* There is a non-null envelope sender. Build the header using the original
2694 sender address, before any rewriting that might have been done while
2699 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2701 (oname[0] == 0)? "" : " <",
2702 (sender_address_unrewritten == NULL)?
2703 sender_address : sender_address_unrewritten,
2704 (oname[0] == 0)? "" : ">");
2706 from_header = header_last; /* To get it checked for Sender: */
2711 /* If the sender is local (without suppress_local_fixups), or if we are in
2712 submission mode and there is an authenticated_id, check that an existing From:
2713 is correct, and if not, generate a Sender: header, unless disabled. Any
2714 previously-existing Sender: header was removed above. Note that sender_local,
2715 as well as being TRUE if the caller of exim is not trusted, is also true if a
2716 trusted caller did not supply a -f argument for non-smtp input. To allow
2717 trusted callers to forge From: without supplying -f, we have to test explicitly
2718 here. If the From: header contains more than one address, then the call to
2719 parse_extract_address fails, and a Sender: header is inserted, as required. */
2721 if (from_header != NULL &&
2722 (active_local_from_check &&
2723 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2724 (submission_mode && authenticated_id != NULL))
2727 BOOL make_sender = TRUE;
2728 int start, end, domain;
2730 uschar *from_address =
2731 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2732 &start, &end, &domain, FALSE);
2733 uschar *generated_sender_address;
2735 if (submission_mode)
2737 if (submission_domain == NULL)
2739 generated_sender_address = string_sprintf("%s@%s",
2740 local_part_quote(authenticated_id), qualify_domain_sender);
2742 else if (submission_domain[0] == 0) /* empty => full address */
2744 generated_sender_address = string_sprintf("%s",
2749 generated_sender_address = string_sprintf("%s@%s",
2750 local_part_quote(authenticated_id), submission_domain);
2754 generated_sender_address = string_sprintf("%s@%s",
2755 local_part_quote(originator_login), qualify_domain_sender);
2757 /* Remove permitted prefixes and suffixes from the local part of the From:
2758 address before doing the comparison with the generated sender. */
2760 if (from_address != NULL)
2763 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2765 if (at != NULL) *at = 0;
2766 from_address += route_check_prefix(from_address, local_from_prefix);
2767 slen = route_check_suffix(from_address, local_from_suffix);
2770 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2771 from_address += slen;
2773 if (at != NULL) *at = '@';
2775 if (strcmpic(generated_sender_address, from_address) == 0 ||
2776 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2777 make_sender = FALSE;
2780 /* We have to cause the Sender header to be rewritten if there are
2781 appropriate rewriting rules. */
2785 if (submission_mode && submission_name == NULL)
2786 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2787 generated_sender_address);
2789 header_add(htype_sender, "%sSender: %s <%s>\n",
2791 submission_mode? submission_name : originator_name,
2792 generated_sender_address);
2795 /* Ensure that a non-null envelope sender address corresponds to the
2796 submission mode sender address. */
2798 if (submission_mode && sender_address[0] != 0)
2800 if (sender_address_unrewritten == NULL)
2801 sender_address_unrewritten = sender_address;
2802 sender_address = generated_sender_address;
2803 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2804 log_write(L_address_rewrite, LOG_MAIN,
2805 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2806 sender_address_unrewritten, generated_sender_address);
2810 /* If there are any rewriting rules, apply them to the sender address, unless
2811 it has already been rewritten as part of verification for SMTP input. */
2813 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2814 sender_address[0] != 0)
2816 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2817 global_rewrite_rules, rewrite_existflags);
2818 DEBUG(D_receive|D_rewrite)
2819 debug_printf("rewritten sender = %s\n", sender_address);
2823 /* The headers must be run through rewrite_header(), because it ensures that
2824 addresses are fully qualified, as well as applying any rewriting rules that may
2827 Qualification of header addresses in a message from a remote host happens only
2828 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2829 appropriate. For local messages, qualification always happens, unless -bnq is
2830 used to explicitly suppress it. No rewriting is done for an unqualified address
2831 that is left untouched.
2833 We start at the second header, skipping our own Received:. This rewriting is
2834 documented as happening *after* recipient addresses are taken from the headers
2835 by the -t command line option. An added Sender: gets rewritten here. */
2837 for (h = header_list->next; h != NULL; h = h->next)
2839 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2840 rewrite_existflags, TRUE);
2841 if (newh != NULL) h = newh;
2845 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2846 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2847 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2848 exists, this applies to the set of resent- headers rather than the normal set.
2850 The requirement for a recipient header has been removed in RFC 2822. At this
2851 point in the code, earlier versions of Exim added a To: header for locally
2852 submitted messages, and an empty Bcc: header for others. In the light of the
2853 changes in RFC 2822, this was dropped in November 2003. */
2856 /* If there is no date header, generate one if the message originates locally
2857 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2858 submission mode flag is set. Messages without Date: are not valid, but it seems
2859 to be more confusing if Exim adds one to all remotely-originated messages.
2860 As per Message-Id, we prepend if resending, else append.
2863 if (!date_header_exists &&
2864 ((sender_host_address == NULL && !suppress_local_fixups)
2865 || submission_mode))
2866 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2867 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2869 search_tidyup(); /* Free any cached resources */
2871 /* Show the complete set of headers if debugging. Note that the first one (the
2872 new Received:) has not yet been set. */
2876 debug_printf(">>Headers after rewriting and local additions:\n");
2877 for (h = header_list->next; h != NULL; h = h->next)
2878 debug_printf("%c %s", h->type, h->text);
2882 /* The headers are now complete in store. If we are running in filter
2883 testing mode, that is all this function does. Return TRUE if the message
2884 ended with a dot. */
2886 if (filter_test != FTEST_NONE)
2888 process_info[process_info_len] = 0;
2889 return message_ended == END_DOT;
2892 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2893 think more if it could be handled. Cannot do onward CHUNKING unless
2894 inbound is, but inbound chunking ought to be ok with outbound plain.
2895 Could we do onward CHUNKING given inbound CHUNKING?
2897 if (chunking_state > CHUNKING_OFFERED)
2898 cancel_cutthrough_connection("chunking active");
2900 /* Cutthrough delivery:
2901 We have to create the Received header now rather than at the end of reception,
2902 so the timestamp behaviour is a change to the normal case.
2903 XXX Ensure this gets documented XXX.
2904 Having created it, send the headers to the destination. */
2905 if (cutthrough.fd >= 0)
2907 if (received_count > received_headers_max)
2909 cancel_cutthrough_connection("too many headers");
2910 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2911 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2912 "Too many \"Received\" headers",
2914 (sender_fullhost == NULL)? "" : " H=",
2915 (sender_fullhost == NULL)? US"" : sender_fullhost,
2916 (sender_ident == NULL)? "" : " U=",
2917 (sender_ident == NULL)? US"" : sender_ident);
2918 message_id[0] = 0; /* Indicate no message accepted */
2919 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2920 goto TIDYUP; /* Skip to end of function */
2922 received_header_gen();
2923 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2924 (void) cutthrough_headers_send();
2928 /* Open a new spool file for the data portion of the message. We need
2929 to access it both via a file descriptor and a stream. Try to make the
2930 directory if it isn't there. */
2932 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
2933 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
2935 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
2937 if (errno == ENOENT)
2939 (void) directory_make(spool_directory,
2940 spool_sname(US"input", message_subdir),
2941 INPUT_DIRECTORY_MODE, TRUE);
2942 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2945 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2946 spool_name, strerror(errno));
2949 /* Make sure the file's group is the Exim gid, and double-check the mode
2950 because the group setting doesn't always get set automatically. */
2952 if (fchown(data_fd, exim_uid, exim_gid))
2953 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2954 "Failed setting ownership on spool file %s: %s",
2955 spool_name, strerror(errno));
2956 (void)fchmod(data_fd, SPOOL_MODE);
2958 /* We now have data file open. Build a stream for it and lock it. We lock only
2959 the first line of the file (containing the message ID) because otherwise there
2960 are problems when Exim is run under Cygwin (I'm told). See comments in
2961 spool_in.c, where the same locking is done. */
2963 data_file = fdopen(data_fd, "w+");
2964 lock_data.l_type = F_WRLCK;
2965 lock_data.l_whence = SEEK_SET;
2966 lock_data.l_start = 0;
2967 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2969 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2970 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2971 errno, strerror(errno));
2973 /* We have an open, locked data file. Write the message id to it to make it
2974 self-identifying. Then read the remainder of the input of this message and
2975 write it to the data file. If the variable next != NULL, it contains the first
2976 data line (which was read as a header but then turned out not to have the right
2977 format); write it (remembering that it might contain binary zeros). The result
2978 of fwrite() isn't inspected; instead we call ferror() below. */
2980 fprintf(data_file, "%s-D\n", message_id);
2983 uschar *s = next->text;
2984 int len = next->slen;
2985 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2986 body_linecount++; /* Assumes only 1 line */
2989 /* Note that we might already be at end of file, or the logical end of file
2990 (indicated by '.'), or might have encountered an error while writing the
2991 message id or "next" line. */
2993 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2997 message_ended = chunking_state > CHUNKING_OFFERED
2998 ? read_message_bdat_smtp(data_file)
2999 : read_message_data_smtp(data_file);
3000 receive_linecount++; /* The terminating "." line */
3002 else message_ended = read_message_data(data_file);
3004 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3005 message_linecount += body_linecount;
3007 switch (message_ended)
3009 /* Handle premature termination of SMTP */
3014 Uunlink(spool_name); /* Lose data file when closed */
3015 cancel_cutthrough_connection("sender closed connection");
3016 message_id[0] = 0; /* Indicate no message accepted */
3017 smtp_reply = handle_lost_connection(US"");
3019 goto TIDYUP; /* Skip to end of function */
3023 /* Handle message that is too big. Don't use host_or_ident() in the log
3024 message; we want to see the ident value even for non-remote messages. */
3027 Uunlink(spool_name); /* Lose the data file when closed */
3028 cancel_cutthrough_connection("mail too big");
3029 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3031 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3032 "message too big: read=%d max=%d",
3034 (sender_fullhost == NULL)? "" : " H=",
3035 (sender_fullhost == NULL)? US"" : sender_fullhost,
3036 (sender_ident == NULL)? "" : " U=",
3037 (sender_ident == NULL)? US"" : sender_ident,
3039 thismessage_size_limit);
3043 smtp_reply = US"552 Message size exceeds maximum permitted";
3044 message_id[0] = 0; /* Indicate no message accepted */
3045 goto TIDYUP; /* Skip to end of function */
3049 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3050 give_local_error(ERRMESS_TOOBIG,
3051 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3052 US"message rejected: ", error_rc, data_file, header_list);
3053 /* Does not return */
3057 /* Handle bad BDAT protocol sequence */
3060 Uunlink(spool_name); /* Lose the data file when closed */
3061 cancel_cutthrough_connection("sender protocol error");
3062 smtp_reply = US""; /* Response already sent */
3063 message_id[0] = 0; /* Indicate no message accepted */
3064 goto TIDYUP; /* Skip to end of function */
3068 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3069 example, there may be some expansion in an ACL that uses a timer.) */
3071 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3073 /* The message body has now been read into the data file. Call fflush() to
3074 empty the buffers in C, and then call fsync() to get the data written out onto
3075 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3076 having to do this). If there was an I/O error on either input or output,
3077 attempt to send an error message, and unlink the spool file. For non-SMTP input
3078 we can then give up. Note that for SMTP input we must swallow the remainder of
3079 the input in cases of output errors, since the far end doesn't expect to see
3080 anything until the terminating dot line is sent. */
3082 if (fflush(data_file) == EOF || ferror(data_file) ||
3083 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3085 uschar *msg_errno = US strerror(errno);
3086 BOOL input_error = (receive_ferror)() != 0;
3087 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3088 input_error? "Input read" : "Spool write",
3090 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3092 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3093 Uunlink(spool_name); /* Lose the data file */
3094 cancel_cutthrough_connection("error writing spoolfile");
3099 smtp_reply = US"451 Error while reading input data";
3102 smtp_reply = US"451 Error while writing spool file";
3103 receive_swallow_smtp();
3105 message_id[0] = 0; /* Indicate no message accepted */
3106 goto TIDYUP; /* Skip to end of function */
3111 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3112 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3114 /* Does not return */
3119 /* No I/O errors were encountered while writing the data file. */
3121 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3124 /* If there were any bad addresses extracted by -t, or there were no recipients
3125 left after -t, send a message to the sender of this message, or write it to
3126 stderr if the error handling option is set that way. Note that there may
3127 legitimately be no recipients for an SMTP message if they have all been removed
3130 We need to rewind the data file in order to read it. In the case of no
3131 recipients or stderr error writing, throw the data file away afterwards, and
3132 exit. (This can't be SMTP, which always ensures there's at least one
3133 syntactically good recipient address.) */
3135 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3139 if (recipients_count == 0) debug_printf("*** No recipients\n");
3140 if (bad_addresses != NULL)
3142 error_block *eblock = bad_addresses;
3143 debug_printf("*** Bad address(es)\n");
3144 while (eblock != NULL)
3146 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3147 eblock = eblock->next;
3152 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3154 /* If configured to send errors to the sender, but this fails, force
3155 a failure error code. We use a special one for no recipients so that it
3156 can be detected by the autoreply transport. Otherwise error_rc is set to
3157 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3158 it is EXIT_SUCCESS. */
3160 if (error_handling == ERRORS_SENDER)
3162 if (!moan_to_sender(
3163 (bad_addresses == NULL)?
3164 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3165 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3166 bad_addresses, header_list, data_file, FALSE))
3167 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3171 if (bad_addresses == NULL)
3173 if (extracted_ignored)
3174 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3176 fprintf(stderr, "exim: no recipients in message\n");
3180 fprintf(stderr, "exim: invalid address%s",
3181 (bad_addresses->next == NULL)? ":" : "es:\n");
3182 while (bad_addresses != NULL)
3184 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3185 bad_addresses->text2);
3186 bad_addresses = bad_addresses->next;
3191 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3193 Uunlink(spool_name);
3194 (void)fclose(data_file);
3195 exim_exit(error_rc);
3199 /* Data file successfully written. Generate text for the Received: header by
3200 expanding the configured string, and adding a timestamp. By leaving this
3201 operation till now, we ensure that the timestamp is the time that message
3202 reception was completed. However, this is deliberately done before calling the
3203 data ACL and local_scan().
3205 This Received: header may therefore be inspected by the data ACL and by code in
3206 the local_scan() function. When they have run, we update the timestamp to be
3207 the final time of reception.
3209 If there is just one recipient, set up its value in the $received_for variable
3210 for use when we generate the Received: header.
3212 Note: the checking for too many Received: headers is handled by the delivery
3214 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3216 if (received_header->text == NULL) /* Non-cutthrough case */
3218 received_header_gen();
3220 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3222 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3223 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3225 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3226 now, before running the DATA ACL. */
3228 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3231 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3232 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3234 /* If an ACL is specified for checking things at this stage of reception of a
3235 message, run it, unless all the recipients were removed by "discard" in earlier
3236 ACLs. That is the only case in which recipients_count can be zero at this
3237 stage. Set deliver_datafile to point to the data file so that $message_body and
3238 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3241 deliver_datafile = data_fd;
3244 enable_dollar_recipients = TRUE;
3246 if (recipients_count == 0)
3247 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3251 /* Handle interactive SMTP messages */
3253 if (smtp_input && !smtp_batched_input)
3256 #ifndef DISABLE_DKIM
3257 if (!dkim_disable_verify)
3259 /* Finish verification, this will log individual signature results to
3261 dkim_exim_verify_finish();
3263 /* Check if we must run the DKIM ACL */
3264 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3266 uschar *dkim_verify_signers_expanded =
3267 expand_string(dkim_verify_signers);
3268 if (!dkim_verify_signers_expanded)
3269 log_write(0, LOG_MAIN|LOG_PANIC,
3270 "expansion of dkim_verify_signers option failed: %s",
3271 expand_string_message);
3276 const uschar *ptr = dkim_verify_signers_expanded;
3277 uschar *item = NULL;
3278 uschar *seen_items = NULL;
3279 int seen_items_size = 0;
3280 int seen_items_offset = 0;
3281 /* Default to OK when no items are present */
3283 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3285 /* Prevent running ACL for an empty item */
3286 if (!item || !*item) continue;
3288 /* Only run ACL once for each domain or identity,
3289 no matter how often it appears in the expanded list. */
3292 uschar *seen_item = NULL;
3293 const uschar *seen_items_list = seen_items;
3294 BOOL seen_this_item = FALSE;
3296 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3298 if (Ustrcmp(seen_item,item) == 0)
3300 seen_this_item = TRUE;
3307 debug_printf("acl_smtp_dkim: skipping signer %s, "
3308 "already seen\n", item);
3312 seen_items = string_append(seen_items, &seen_items_size,
3313 &seen_items_offset, 1, ":");
3316 seen_items = string_append(seen_items, &seen_items_size,
3317 &seen_items_offset, 1, item);
3318 seen_items[seen_items_offset] = '\0';
3321 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3324 dkim_exim_acl_setup(item);
3325 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3326 &user_msg, &log_msg);
3331 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3332 "skipping remaining items\n", rc, item);
3333 cancel_cutthrough_connection("dkim acl not ok");
3337 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3340 recipients_count = 0;
3341 blackholed_by = US"DKIM ACL";
3342 if (log_msg != NULL)
3343 blackhole_log_msg = string_sprintf(": %s", log_msg);
3347 Uunlink(spool_name);
3348 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3349 smtp_yield = FALSE; /* No more messages after dropped connection */
3350 smtp_reply = US""; /* Indicate reply already sent */
3351 message_id[0] = 0; /* Indicate no message accepted */
3352 goto TIDYUP; /* Skip to end of function */
3357 #endif /* DISABLE_DKIM */
3359 #ifdef WITH_CONTENT_SCAN
3360 if (recipients_count > 0 &&
3361 acl_smtp_mime != NULL &&
3362 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3364 #endif /* WITH_CONTENT_SCAN */
3366 #ifdef EXPERIMENTAL_DMARC
3367 dmarc_up = dmarc_store_data(from_header);
3368 #endif /* EXPERIMENTAL_DMARC */
3370 #ifndef DISABLE_PRDR
3371 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3375 int all_fail = FAIL;
3377 smtp_printf("353 PRDR content analysis beginning\r\n");
3378 /* Loop through recipients, responses must be in same order received */
3379 for (c = 0; recipients_count > c; c++)
3381 uschar * addr= recipients_list[c].address;
3382 uschar * msg= US"PRDR R=<%s> %s";
3385 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3386 addr, c+1, recipients_count);
3387 rc = acl_check(ACL_WHERE_PRDR, addr,
3388 acl_smtp_data_prdr, &user_msg, &log_msg);
3390 /* If any recipient rejected content, indicate it in final message */
3392 /* If all recipients rejected, indicate in final message */
3397 case OK: case DISCARD: code = US"250"; break;
3398 case DEFER: code = US"450"; break;
3399 default: code = US"550"; break;
3401 if (user_msg != NULL)
3402 smtp_user_msg(code, user_msg);
3407 case OK: case DISCARD:
3408 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3410 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3412 msg = string_sprintf(CS msg, addr, "refusal"); break;
3414 smtp_user_msg(code, msg);
3416 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3417 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3418 else log_write(0, LOG_MAIN, "%s", CS msg);
3420 if (rc != OK) { receive_remove_recipient(addr); c--; }
3422 /* Set up final message, used if data acl gives OK */
3423 smtp_reply = string_sprintf("%s id=%s message %s",
3424 all_fail == FAIL ? US"550" : US"250",
3427 ? US"rejected for all recipients"
3430 : US"accepted for some recipients");
3431 if (recipients_count == 0)
3433 message_id[0] = 0; /* Indicate no message accepted */
3438 prdr_requested = FALSE;
3439 #endif /* !DISABLE_PRDR */
3441 /* Check the recipients count again, as the MIME ACL might have changed
3444 if (acl_smtp_data != NULL && recipients_count > 0)
3446 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3447 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3450 recipients_count = 0;
3451 blackholed_by = US"DATA ACL";
3452 if (log_msg != NULL)
3453 blackhole_log_msg = string_sprintf(": %s", log_msg);
3454 cancel_cutthrough_connection("data acl discard");
3458 Uunlink(spool_name);
3459 cancel_cutthrough_connection("data acl not ok");
3460 #ifdef WITH_CONTENT_SCAN
3463 #ifdef EXPERIMENTAL_DCC
3466 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3467 smtp_yield = FALSE; /* No more messages after dropped connection */
3468 smtp_reply = US""; /* Indicate reply already sent */
3469 message_id[0] = 0; /* Indicate no message accepted */
3470 goto TIDYUP; /* Skip to end of function */
3475 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3476 we cannot take different actions for permanent and temporary rejections. */
3481 #ifdef WITH_CONTENT_SCAN
3482 if (acl_not_smtp_mime != NULL &&
3483 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3486 #endif /* WITH_CONTENT_SCAN */
3488 if (acl_not_smtp != NULL)
3490 uschar *user_msg, *log_msg;
3491 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3494 recipients_count = 0;
3495 blackholed_by = US"non-SMTP ACL";
3496 if (log_msg != NULL)
3497 blackhole_log_msg = string_sprintf(": %s", log_msg);
3501 Uunlink(spool_name);
3502 #ifdef WITH_CONTENT_SCAN
3505 #ifdef EXPERIMENTAL_DCC
3508 /* The ACL can specify where rejections are to be logged, possibly
3509 nowhere. The default is main and reject logs. */
3511 if (log_reject_target != 0)
3512 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3513 sender_address, log_msg);
3515 if (user_msg == NULL) user_msg = US"local configuration problem";
3516 if (smtp_batched_input)
3518 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3519 /* Does not return */
3523 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3524 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3525 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3527 /* Does not return */
3530 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3534 /* The applicable ACLs have been run */
3536 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3537 if (queue_only_policy) queued_by = US"ACL";
3540 #ifdef WITH_CONTENT_SCAN
3544 #ifdef EXPERIMENTAL_DCC
3549 /* The final check on the message is to run the scan_local() function. The
3550 version supplied with Exim always accepts, but this is a hook for sysadmins to
3551 supply their own checking code. The local_scan() function is run even when all
3552 the recipients have been discarded. */
3554 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3556 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3557 deleted, and the incident gets logged. */
3559 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3560 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3561 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3562 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3564 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3565 local_scan_timeout);
3566 local_scan_data = NULL;
3568 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3569 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3570 rc = local_scan(data_fd, &local_scan_data);
3572 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3574 enable_dollar_recipients = FALSE;
3576 store_pool = POOL_MAIN; /* In case changed */
3577 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3580 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3581 os_non_restarting_signal(SIGFPE, SIG_DFL);
3582 os_non_restarting_signal(SIGILL, SIG_DFL);
3583 os_non_restarting_signal(SIGBUS, SIG_DFL);
3585 /* The length check is paranoia against some runaway code, and also because
3586 (for a success return) lines in the spool file are read into big_buffer. */
3588 if (local_scan_data != NULL)
3590 int len = Ustrlen(local_scan_data);
3591 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3592 local_scan_data = string_copyn(local_scan_data, len);
3595 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3597 if (!deliver_freeze) /* ACL might have already frozen */
3599 deliver_freeze = TRUE;
3600 deliver_frozen_at = time(NULL);
3601 frozen_by = US"local_scan()";
3603 rc = LOCAL_SCAN_ACCEPT;
3605 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3607 if (!queue_only_policy) /* ACL might have already queued */
3609 queue_only_policy = TRUE;
3610 queued_by = US"local_scan()";
3612 rc = LOCAL_SCAN_ACCEPT;
3615 /* Message accepted: remove newlines in local_scan_data because otherwise
3616 the spool file gets corrupted. Ensure that all recipients are qualified. */
3618 if (rc == LOCAL_SCAN_ACCEPT)
3620 if (local_scan_data != NULL)
3623 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3625 for (i = 0; i < recipients_count; i++)
3627 recipient_item *r = recipients_list + i;
3628 r->address = rewrite_address_qualify(r->address, TRUE);
3629 if (r->errors_to != NULL)
3630 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3632 if (recipients_count == 0 && blackholed_by == NULL)
3633 blackholed_by = US"local_scan";
3636 /* Message rejected: newlines permitted in local_scan_data to generate
3637 multiline SMTP responses. */
3641 uschar *istemp = US"";
3647 errmsg = local_scan_data;
3649 Uunlink(spool_name); /* Cancel this message */
3653 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3654 "rejection given", rc);
3657 case LOCAL_SCAN_REJECT_NOLOGHDR:
3658 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3661 case LOCAL_SCAN_REJECT:
3662 smtp_code = US"550";
3663 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3666 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3667 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3670 case LOCAL_SCAN_TEMPREJECT:
3672 smtp_code = US"451";
3673 if (errmsg == NULL) errmsg = US"Temporary local problem";
3674 istemp = US"temporarily ";
3678 s = string_append(s, &size, &sptr, 2, US"F=",
3679 (sender_address[0] == 0)? US"<>" : sender_address);
3680 s = add_host_info_for_log(s, &size, &sptr);
3683 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3684 s, istemp, string_printing(errmsg));
3688 if (!smtp_batched_input)
3690 smtp_respond(smtp_code, 3, TRUE, errmsg);
3691 message_id[0] = 0; /* Indicate no message accepted */
3692 smtp_reply = US""; /* Indicate reply already sent */
3693 goto TIDYUP; /* Skip to end of function */
3697 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3698 /* Does not return */
3703 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3704 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3705 US"message rejected by local scan code: ", error_rc, data_file,
3707 /* Does not return */
3711 /* Reset signal handlers to ignore signals that previously would have caused
3712 the message to be abandoned. */
3714 signal(SIGTERM, SIG_IGN);
3715 signal(SIGINT, SIG_IGN);
3718 /* Ensure the first time flag is set in the newly-received message. */
3720 deliver_firsttime = TRUE;
3722 #ifdef EXPERIMENTAL_BRIGHTMAIL
3724 { /* rewind data file */
3725 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3726 bmi_verdicts = bmi_process_message(header_list, data_fd);
3730 /* Update the timstamp in our Received: header to account for any time taken by
3731 an ACL or by local_scan(). The new time is the time that all reception
3732 processing is complete. */
3734 timestamp = expand_string(US"${tod_full}");
3735 tslen = Ustrlen(timestamp);
3737 memcpy(received_header->text + received_header->slen - tslen - 1,
3740 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3744 deliver_freeze = FALSE;
3745 queue_only_policy = FALSE;
3748 /* Keep the data file open until we have written the header file, in order to
3749 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3750 don't write the header file, and we unlink the data file. If writing the header
3751 file fails, we have failed to accept this message. */
3753 if (host_checking || blackholed_by != NULL)
3756 Uunlink(spool_name);
3757 msg_size = 0; /* Compute size for log line */
3758 for (h = header_list; h != NULL; h = h->next)
3759 if (h->type != '*') msg_size += h->slen;
3762 /* Write the -H file */
3765 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3767 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3768 Uunlink(spool_name); /* Lose the data file */
3772 smtp_reply = US"451 Error in writing spool file";
3773 message_id[0] = 0; /* Indicate no message accepted */
3778 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3779 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3781 /* Does not return */
3786 /* The message has now been successfully received. */
3788 receive_messagecount++;
3790 /* In SMTP sessions we may receive several in one connection. After each one,
3791 we wait for the clock to tick at the level of message-id granularity. This is
3792 so that the combination of time+pid is unique, even on systems where the pid
3793 can be re-used within our time interval. We can't shorten the interval without
3794 re-designing the message-id. See comments above where the message id is
3795 created. This is Something For The Future. */
3797 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3798 exim_wait_tick(&message_id_tv, id_resolution);
3800 /* Add data size to written header size. We do not count the initial file name
3801 that is in the file, but we do add one extra for the notional blank line that
3802 precedes the data. This total differs from message_size in that it include the
3803 added Received: header and any other headers that got created locally. */
3806 fstat(data_fd, &statbuf);
3808 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3810 /* Generate a "message received" log entry. We do this by building up a dynamic
3811 string as required. Since we commonly want to add two items at a time, use a
3812 macro to simplify the coding. We log the arrival of a new message while the
3813 file is still locked, just in case the machine is *really* fast, and delivers
3814 it first! Include any message id that is in the message - since the syntax of a
3815 message id is actually an addr-spec, we can use the parse routine to canonicize
3820 s = store_get(size);
3822 s = string_append(s, &size, &sptr, 2, US"<= ",
3823 (sender_address[0] == 0)? US"<>" : sender_address);
3824 if (message_reference != NULL)
3825 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3827 s = add_host_info_for_log(s, &size, &sptr);
3830 if (LOGGING(tls_cipher) && tls_in.cipher)
3831 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3832 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3833 s = string_append(s, &size, &sptr, 2, US" CV=",
3834 tls_in.certificate_verified? "yes":"no");
3835 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3836 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3837 string_printing(tls_in.peerdn), US"\"");
3838 if (LOGGING(tls_sni) && tls_in.sni)
3839 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3840 string_printing(tls_in.sni), US"\"");
3843 if (sender_host_authenticated)
3845 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3846 if (authenticated_id != NULL)
3848 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3849 if (LOGGING(smtp_mailauth) && authenticated_sender != NULL)
3850 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3854 #ifndef DISABLE_PRDR
3856 s = string_catn(s, &size, &sptr, US" PRDR", 5);
3859 #ifdef SUPPORT_PROXY
3860 if (proxy_session && LOGGING(proxy))
3861 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3864 if (chunking_state > CHUNKING_OFFERED)
3865 s = string_catn(s, &size, &sptr, US" K", 2);
3867 sprintf(CS big_buffer, "%d", msg_size);
3868 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3870 /* log 8BITMIME mode announced in MAIL_FROM
3874 if (LOGGING(8bitmime))
3876 sprintf(CS big_buffer, "%d", body_8bitmime);
3877 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3881 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
3883 /* If an addr-spec in a message-id contains a quoted string, it can contain
3884 any characters except " \ and CR and so in particular it can contain NL!
3885 Therefore, make sure we use a printing-characters only version for the log.
3886 Also, allow for domain literals in the message id. */
3888 if (msgid_header != NULL)
3891 BOOL save_allow_domain_literals = allow_domain_literals;
3892 allow_domain_literals = TRUE;
3893 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3894 &errmsg, &start, &end, &domain, FALSE);
3895 allow_domain_literals = save_allow_domain_literals;
3897 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3900 /* If subject logging is turned on, create suitable printing-character
3901 text. By expanding $h_subject: we make use of the MIME decoding. */
3903 if (LOGGING(subject) && subject_header != NULL)
3906 uschar *p = big_buffer;
3907 uschar *ss = expand_string(US"$h_subject:");
3909 /* Backslash-quote any double quotes or backslashes so as to make a
3910 a C-like string, and turn any non-printers into escape sequences. */
3913 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3915 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3920 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3923 /* Terminate the string: string_cat() and string_append() leave room, but do
3924 not put the zero in. */
3928 /* Create a message log file if message logs are being used and this message is
3929 not blackholed. Write the reception stuff to it. We used to leave message log
3930 creation until the first delivery, but this has proved confusing for some
3933 if (message_logs && blackholed_by == NULL)
3937 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
3939 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
3943 (void)directory_make(spool_directory,
3944 spool_sname(US"msglog", message_subdir),
3945 MSGLOG_DIRECTORY_MODE, TRUE);
3946 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3951 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3952 spool_name, strerror(errno));
3957 FILE *message_log = fdopen(fd, "a");
3958 if (message_log == NULL)
3960 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3961 spool_name, strerror(errno));
3966 uschar *now = tod_stamp(tod_log);
3967 fprintf(message_log, "%s Received from %s\n", now, s+3);
3968 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3970 if (queue_only_policy) fprintf(message_log,
3971 "%s no immediate delivery: queued by %s\n", now, queued_by);
3972 (void)fclose(message_log);
3977 /* Everything has now been done for a successful message except logging its
3978 arrival, and outputting an SMTP response. While writing to the log, set a flag
3979 to cause a call to receive_bomb_out() if the log cannot be opened. */
3981 receive_call_bombout = TRUE;
3983 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3984 connection has gone away. This can only be done if there is no unconsumed input
3985 waiting in the local input buffer. We can test for this by calling
3986 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3987 input to be sent following the final dot, so the presence of following input is
3990 If the connection is still present, but there is no unread input for the
3991 socket, the result of a select() call will be zero. If, however, the connection
3992 has gone away, or if there is pending input, the result of select() will be
3993 non-zero. The two cases can be distinguished by trying to read the next input
3994 character. If we succeed, we can unread it so that it remains in the local
3995 buffer for handling later. If not, the connection has been lost.
3997 Of course, since TCP/IP is asynchronous, there is always a chance that the
3998 connection will vanish between the time of this test and the sending of the
3999 response, but the chance of this happening should be small. */
4001 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4002 !receive_smtp_buffered())
4005 fd_set select_check;
4006 FD_ZERO(&select_check);
4007 FD_SET(fileno(smtp_in), &select_check);
4011 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4013 int c = (receive_getc)();
4014 if (c != EOF) (receive_ungetc)(c); else
4016 uschar *msg = US"SMTP connection lost after final dot";
4017 smtp_reply = US""; /* No attempt to send a response */
4018 smtp_yield = FALSE; /* Nothing more on this connection */
4020 /* Re-use the log line workspace */
4023 s = string_cat(s, &size, &sptr, msg);
4024 s = add_host_info_for_log(s, &size, &sptr);
4026 log_write(0, LOG_MAIN, "%s", s);
4028 /* Delete the files for this aborted message. */
4030 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4031 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4032 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4039 /* The connection has not gone away; we really are going to take responsibility
4040 for this message. */
4042 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4045 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4046 the sender's dot (below).
4047 If rejected: copy response to sender, wipe the spooled files, log approriately.
4048 If temp-reject: accept to sender, keep the spooled files.
4050 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4052 XXX We do not handle queue-only, freezing, or blackholes.
4054 if(cutthrough.fd >= 0)
4056 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the message */
4057 /* Logging was done in finaldot() */
4060 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4061 cutthrough_done = ACCEPTED;
4062 break; /* message_id needed for SMTP accept below */
4064 default: /* Unknown response, or error. Treat as temp-reject. */
4065 case '4': /* Temp-reject. Keep spoolfiles and accept. */
4066 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4067 break; /* message_id needed for SMTP accept below */
4069 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4070 smtp_reply= msg; /* Pass on the exact error */
4071 cutthrough_done = PERM_REJ;
4076 #ifndef DISABLE_PRDR
4077 if(!smtp_reply || prdr_requested)
4082 log_write(0, LOG_MAIN |
4083 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4084 (LOGGING(received_sender)? LOG_SENDER : 0),
4087 /* Log any control actions taken by an ACL or local_scan(). */
4089 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4090 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4091 "no immediate delivery: queued by %s", queued_by);
4093 receive_call_bombout = FALSE;
4095 store_reset(s); /* The store for the main log message can be reused */
4097 /* If the message is frozen, and freeze_tell is set, do the telling. */
4099 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4101 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4102 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4103 message_id, frozen_by, sender_address);
4107 /* Either a message has been successfully received and written to the two spool
4108 files, or an error in writing the spool has occurred for an SMTP message, or
4109 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4110 we will have already given up because there's no point in carrying on!) In
4111 either event, we must now close (and thereby unlock) the data file. In the
4112 successful case, this leaves the message on the spool, ready for delivery. In
4113 the error case, the spool file will be deleted. Then tidy up store, interact
4114 with an SMTP call if necessary, and return.
4116 A fflush() was done earlier in the expectation that any write errors on the
4117 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4118 possible for fclose() to fail - but what to do? What has happened to the lock
4123 process_info[process_info_len] = 0; /* Remove message id */
4124 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4126 /* Now reset signal handlers to their defaults */
4128 signal(SIGTERM, SIG_DFL);
4129 signal(SIGINT, SIG_DFL);
4131 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4132 value, which defaults TRUE - meaning there may be more incoming messages from
4133 this connection. For non-SMTP callers (where there is only ever one message),
4134 the default is FALSE. */
4140 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4141 is set to the response that should be sent. When it is NULL, we generate
4142 default responses. After an ACL error or local_scan() error, the response has
4143 already been sent, and smtp_reply is an empty string to indicate this. */
4145 if (!smtp_batched_input)
4147 if (smtp_reply == NULL)
4149 if (fake_response != OK)
4150 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4151 fake_response_text);
4153 /* An OK response is required; use "message" text if present. */
4155 else if (user_msg != NULL)
4157 uschar *code = US"250";
4159 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4160 smtp_respond(code, len, TRUE, user_msg);
4163 /* Default OK response */
4165 else if (chunking_state > CHUNKING_OFFERED)
4167 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4168 chunking_datasize, message_size+message_linecount, message_id);
4169 chunking_state = CHUNKING_OFFERED;
4172 smtp_printf("250 OK id=%s\r\n", message_id);
4176 "\n**** SMTP testing: that is not a real message id!\n\n");
4179 /* smtp_reply is set non-empty */
4181 else if (smtp_reply[0] != 0)
4183 if (fake_response != OK && (smtp_reply[0] == '2'))
4184 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4185 fake_response_text);
4187 smtp_printf("%.1024s\r\n", smtp_reply);
4190 switch (cutthrough_done)
4192 case ACCEPTED: log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4194 { /* Delete spool files */
4195 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4196 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4197 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4199 case TMP_REJ: message_id[0] = 0; /* Prevent a delivery from starting */
4202 cutthrough.delivery = FALSE;
4205 /* For batched SMTP, generate an error message on failure, and do
4206 nothing on success. The function moan_smtp_batch() does not return -
4207 it exits from the program with a non-zero return code. */
4209 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
4213 /* If blackholing, we can immediately log this message's sad fate. The data
4214 file has already been unlinked, and the header file was never written to disk.
4215 We must now indicate that nothing was received, to prevent a delivery from
4218 if (blackholed_by != NULL)
4220 const uschar *detail = local_scan_data
4221 ? string_printing(local_scan_data)
4222 : string_sprintf("(%s discarded recipients)", blackholed_by);
4223 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4224 log_write(0, LOG_MAIN, "Completed");
4228 /* Reset headers so that logging of rejects for a subsequent message doesn't
4229 include them. It is also important to set header_last = NULL before exiting
4230 from this function, as this prevents certain rewrites that might happen during
4231 subsequent verifying (of another incoming message) from trying to add headers
4232 when they shouldn't. */
4234 header_list = header_last = NULL;
4236 return yield; /* TRUE if more messages (SMTP only) */
4239 /* End of receive.c */