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') { body_linecount++; linelength = -1; }
690 body_linecount++; /* After unwritten "\r" */
691 if (linelength > max_received_linelength)
692 max_received_linelength = linelength;
700 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
701 if (ch == '\r') continue;
707 case 3: /* After "\n." (\n written, dot not) */
708 if (ch == '\n') return END_DOT;
709 if (ch == '\r') { ch_state = 4; continue; }
712 if (fputc('.', fout) == EOF) return END_WERROR;
716 case 4: /* After "\n.\r" (\n written, rest not) */
717 if (ch == '\n') return END_DOT;
720 if (fputs(".\n", fout) == EOF) return END_WERROR;
721 if (ch == '\r') { ch_state = 2; continue; }
727 if (fputc(ch, fout) == EOF) return END_WERROR;
728 if (++message_size > thismessage_size_limit) return END_SIZE;
731 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
732 the message ends with a newline, and we must also write any characters that
733 were saved up while testing for an ending dot. */
737 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
738 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
739 message_size += Ustrlen(ends[ch_state]);
749 /*************************************************
750 * Read data portion of an SMTP message *
751 *************************************************/
753 /* This function is called to read the remainder of an SMTP message (after the
754 headers), or to skip over it when an error has occurred. In this case, the
755 output file is passed as NULL.
757 If any line begins with a dot, that character is skipped. The input should only
758 be successfully terminated by CR LF . CR LF unless it is local (non-network)
759 SMTP, in which case the CRs are optional, but...
761 FUDGE: It seems that sites on the net send out messages with just LF
762 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
763 we make the CRs optional in all cases.
765 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
766 well, so that there are no CRs in spooled messages. However, the message
767 terminating dot is not recognized between two bare CRs.
770 fout a FILE to which to write the message; NULL if skipping
772 Returns: One of the END_xxx values indicating why it stopped reading
776 read_message_data_smtp(FILE *fout)
782 while ((ch = (receive_getc)()) != EOF)
784 if (ch == 0) body_zerocount++;
787 case 0: /* After LF or CRLF */
791 continue; /* Don't ever write . after LF */
795 /* Else fall through to handle as normal uschar. */
797 case 1: /* Normal state */
802 if (linelength > max_received_linelength)
803 max_received_linelength = linelength;
813 case 2: /* After (unwritten) CR */
815 if (linelength > max_received_linelength)
816 max_received_linelength = linelength;
825 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
826 (void) cutthrough_put_nl();
827 if (ch != '\r') ch_state = 1; else continue;
831 case 3: /* After [CR] LF . */
839 /* The dot was removed at state 3. For a doubled dot, here, reinstate
840 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
841 and to file below. */
845 (void) cutthrough_puts(&c, 1);
850 case 4: /* After [CR] LF . CR */
851 if (ch == '\n') return END_DOT;
854 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
855 (void) cutthrough_put_nl();
865 /* Add the character to the spool file, unless skipping; then loop for the
872 if (fputc(ch, fout) == EOF) return END_WERROR;
873 if (message_size > thismessage_size_limit) return END_SIZE;
876 (void) cutthrough_put_nl();
880 (void) cutthrough_puts(&c, 1);
884 /* Fall through here if EOF encountered. This indicates some kind of error,
885 since a correct message is terminated by [CR] LF . [CR] LF. */
893 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
894 CHUNKING. We assume that the incoming has proper CRLF, so only have to scan
895 for and strip CR. On the downside there are more protocol reasons to stop.
898 fout a FILE to which to write the message; NULL if skipping
900 Returns: One of the END_xxx values indicating why it stopped reading
904 read_message_bdat_smtp(FILE *fout)
909 for (;;) switch (ch = bdat_getc())
911 case EOF: return END_EOF;
912 case EOD: return END_DOT;
913 case ERR: return END_PROTOCOL;
917 if (linelength > max_received_linelength)
918 max_received_linelength = linelength;
930 if (fputc(ch, fout) == EOF) return END_WERROR;
931 if (message_size > thismessage_size_limit) return END_SIZE;
935 (void) cutthrough_put_nl();
939 (void) cutthrough_puts(&c, 1);
950 /*************************************************
951 * Swallow SMTP message *
952 *************************************************/
954 /* This function is called when there has been some kind of error while reading
955 an SMTP message, and the remaining data may need to be swallowed. It is global
956 because it is called from smtp_closedown() to shut down an incoming call
959 Argument: a FILE from which to read the message
964 receive_swallow_smtp(void)
966 /*XXX CHUNKING: not enough. read chunks until RSET? */
967 if (message_ended >= END_NOTENDED)
968 message_ended = read_message_data_smtp(NULL);
973 /*************************************************
974 * Handle lost SMTP connection *
975 *************************************************/
977 /* This function logs connection loss incidents and generates an appropriate
980 Argument: additional data for the message
981 Returns: the SMTP response
985 handle_lost_connection(uschar *s)
987 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
988 "%s lost while reading message data%s", smtp_get_connection_info(), s);
989 smtp_notquit_exit(US"connection-lost", NULL, NULL);
990 return US"421 Lost incoming connection";
996 /*************************************************
997 * Handle a non-smtp reception error *
998 *************************************************/
1000 /* This function is called for various errors during the reception of non-SMTP
1001 messages. It either sends a message to the sender of the problem message, or it
1002 writes to the standard error stream.
1005 errcode code for moan_to_sender(), identifying the error
1006 text1 first message text, passed to moan_to_sender()
1007 text2 second message text, used only for stderrr
1008 error_rc code to pass to exim_exit if no problem
1009 f FILE containing body of message (may be stdin)
1010 hptr pointer to instore headers or NULL
1012 Returns: calls exim_exit(), which does not return
1016 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1017 FILE *f, header_line *hptr)
1019 if (error_handling == ERRORS_SENDER)
1023 eblock.text1 = text1;
1024 eblock.text2 = US"";
1025 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1026 error_rc = EXIT_FAILURE;
1029 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1031 exim_exit(error_rc);
1036 /*************************************************
1037 * Add header lines set up by ACL *
1038 *************************************************/
1040 /* This function is called to add the header lines that were set up by
1041 statements in an ACL to the list of headers in memory. It is done in two stages
1042 like this, because when the ACL for RCPT is running, the other headers have not
1043 yet been received. This function is called twice; once just before running the
1044 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1045 are visible to the DATA ACL.
1047 Originally these header lines were added at the end. Now there is support for
1048 three different places: top, bottom, and after the Received: header(s). There
1049 will always be at least one Received: header, even if it is marked deleted, and
1050 even if something else has been put in front of it.
1053 acl_name text to identify which ACL
1059 add_acl_headers(int where, uschar *acl_name)
1061 header_line *h, *next;
1062 header_line *last_received = NULL;
1066 case ACL_WHERE_DKIM:
1067 case ACL_WHERE_MIME:
1068 case ACL_WHERE_DATA:
1069 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1071 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1072 " will not take effect on cutthrough deliveries");
1077 if (acl_removed_headers != NULL)
1079 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1081 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1083 const uschar * list = acl_removed_headers;
1084 int sep = ':'; /* This is specified as a colon-separated list */
1088 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1089 if (header_testname(h, s, Ustrlen(s), FALSE))
1091 h->type = htype_old;
1092 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1095 acl_removed_headers = NULL;
1096 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1099 if (acl_added_headers == NULL) return;
1100 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1102 for (h = acl_added_headers; h != NULL; h = next)
1109 h->next = header_list;
1111 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1115 if (last_received == NULL)
1117 last_received = header_list;
1118 while (!header_testname(last_received, US"Received", 8, FALSE))
1119 last_received = last_received->next;
1120 while (last_received->next != NULL &&
1121 header_testname(last_received->next, US"Received", 8, FALSE))
1122 last_received = last_received->next;
1124 h->next = last_received->next;
1125 last_received->next = h;
1126 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1130 /* add header before any header which is NOT Received: or Resent- */
1131 last_received = header_list;
1132 while ( (last_received->next != NULL) &&
1133 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1134 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1135 last_received = last_received->next;
1136 /* last_received now points to the last Received: or Resent-* header
1137 in an uninterrupted chain of those header types (seen from the beginning
1138 of all headers. Our current header must follow it. */
1139 h->next = last_received->next;
1140 last_received->next = h;
1141 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1146 header_last->next = h;
1150 if (h->next == NULL) header_last = h;
1152 /* Check for one of the known header types (From:, To:, etc.) though in
1153 practice most added headers are going to be "other". Lower case
1154 identification letters are never stored with the header; they are used
1155 for existence tests when messages are received. So discard any lower case
1158 h->type = header_checkname(h, FALSE);
1159 if (h->type >= 'a') h->type = htype_other;
1161 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1164 acl_added_headers = NULL;
1165 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1170 /*************************************************
1171 * Add host information for log line *
1172 *************************************************/
1174 /* Called for acceptance and rejecting log lines. This adds information about
1175 the calling host to a string that is being built dynamically.
1178 s the dynamic string
1179 sizeptr points to the size variable
1180 ptrptr points to the pointer variable
1182 Returns: the extended string
1186 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1188 if (sender_fullhost)
1190 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1191 s = string_cat(s, sizeptr, ptrptr, US" DS");
1192 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1193 if (LOGGING(incoming_interface) && interface_address != NULL)
1195 s = string_cat(s, sizeptr, ptrptr,
1196 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1199 if (sender_ident != NULL)
1200 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1201 if (received_protocol != NULL)
1202 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1208 #ifdef WITH_CONTENT_SCAN
1210 /*************************************************
1211 * Run the MIME ACL on a message *
1212 *************************************************/
1214 /* This code is in a subroutine so that it can be used for both SMTP
1215 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1218 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1219 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1220 smtp_reply_ptr Where SMTP reply is being built
1221 blackholed_by_ptr Where "blackholed by" message is being built
1223 Returns: TRUE to carry on; FALSE to abandon the message
1227 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1228 uschar **blackholed_by_ptr)
1231 uschar rfc822_file_path[2048];
1232 unsigned long mbox_size;
1233 header_line *my_headerlist;
1234 uschar *user_msg, *log_msg;
1235 int mime_part_count_buffer = -1;
1238 memset(CS rfc822_file_path,0,2048);
1240 /* check if it is a MIME message */
1241 my_headerlist = header_list;
1242 while (my_headerlist != NULL)
1244 /* skip deleted headers */
1245 if (my_headerlist->type == '*')
1247 my_headerlist = my_headerlist->next;
1250 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1252 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1255 my_headerlist = my_headerlist->next;
1258 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1262 /* make sure the eml mbox file is spooled up */
1263 mbox_file = spool_mbox(&mbox_size, NULL);
1264 if (mbox_file == NULL) {
1265 /* error while spooling */
1266 log_write(0, LOG_MAIN|LOG_PANIC,
1267 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1268 Uunlink(spool_name);
1270 #ifdef EXPERIMENTAL_DCC
1273 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1274 message_id[0] = 0; /* Indicate no message accepted */
1275 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1276 return FALSE; /* Indicate skip to end of receive function */
1282 mime_part_count = -1;
1283 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1284 (void)fclose(mbox_file);
1286 if (Ustrlen(rfc822_file_path) > 0)
1288 mime_part_count = mime_part_count_buffer;
1290 if (unlink(CS rfc822_file_path) == -1)
1292 log_write(0, LOG_PANIC,
1293 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1298 /* check if we must check any message/rfc822 attachments */
1301 uschar temp_path[1024];
1302 struct dirent * entry;
1305 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1306 spool_directory, message_id);
1308 tempdir = opendir(CS temp_path);
1311 if (!(entry = readdir(tempdir)))
1313 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1315 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1316 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1317 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1326 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1328 /* set RFC822 expansion variable */
1330 mime_part_count_buffer = mime_part_count;
1331 goto MIME_ACL_CHECK;
1333 log_write(0, LOG_PANIC,
1334 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1335 unlink(CS rfc822_file_path);
1340 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1343 recipients_count = 0;
1344 *blackholed_by_ptr = US"MIME ACL";
1348 Uunlink(spool_name);
1350 #ifdef EXPERIMENTAL_DCC
1354 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1356 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1357 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1359 message_id[0] = 0; /* Indicate no message accepted */
1360 return FALSE; /* Cause skip to end of receive function */
1366 #endif /* WITH_CONTENT_SCAN */
1371 received_header_gen(void)
1375 header_line *received_header= header_list;
1377 timestamp = expand_string(US"${tod_full}");
1378 if (recipients_count == 1) received_for = recipients_list[0].address;
1379 received = expand_string(received_header_text);
1380 received_for = NULL;
1384 if(spool_name[0] != 0)
1385 Uunlink(spool_name); /* Lose the data file */
1386 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1387 "(received_header_text) failed: %s", string_printing(received_header_text),
1388 expand_string_message);
1391 /* The first element on the header chain is reserved for the Received header,
1392 so all we have to do is fill in the text pointer, and set the type. However, if
1393 the result of the expansion is an empty string, we leave the header marked as
1394 "old" so as to refrain from adding a Received header. */
1396 if (received[0] == 0)
1398 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1399 received_header->type = htype_old;
1403 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1404 received_header->type = htype_received;
1407 received_header->slen = Ustrlen(received_header->text);
1409 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1410 received_header->type, received_header->text);
1415 /*************************************************
1417 *************************************************/
1419 /* Receive a message on the given input, and put it into a pair of spool files.
1420 Either a non-null list of recipients, or the extract flag will be true, or
1421 both. The flag sender_local is true for locally generated messages. The flag
1422 submission_mode is true if an ACL has obeyed "control = submission". The flag
1423 suppress_local_fixups is true if an ACL has obeyed "control =
1424 suppress_local_fixups" or -G was passed on the command-line.
1425 The flag smtp_input is true if the message is to be
1426 handled using SMTP conventions about termination and lines starting with dots.
1427 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1429 If a message was successfully read, message_id[0] will be non-zero.
1431 The general actions of this function are:
1433 . Read the headers of the message (if any) into a chain of store
1436 . If there is a "sender:" header and the message is locally originated,
1437 throw it away, unless the caller is trusted, or unless
1438 active_local_sender_retain is set - which can only happen if
1439 active_local_from_check is false.
1441 . If recipients are to be extracted from the message, build the
1442 recipients list from the headers, removing any that were on the
1443 original recipients list (unless extract_addresses_remove_arguments is
1444 false), and at the same time, remove any bcc header that may be present.
1446 . Get the spool file for the data, sort out its unique name, open
1447 and lock it (but don't give it the name yet).
1449 . Generate a "Message-Id" header if the message doesn't have one, for
1450 locally-originated messages.
1452 . Generate a "Received" header.
1454 . Ensure the recipients list is fully qualified and rewritten if necessary.
1456 . If there are any rewriting rules, apply them to the sender address
1457 and also to the headers.
1459 . If there is no from: header, generate one, for locally-generated messages
1460 and messages in "submission mode" only.
1462 . If the sender is local, check that from: is correct, and if not, generate
1463 a Sender: header, unless message comes from a trusted caller, or this
1464 feature is disabled by active_local_from_check being false.
1466 . If there is no "date" header, generate one, for locally-originated
1467 or submission mode messages only.
1469 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1470 dot_ends mode, to the data file. Leave it open, to hold the lock.
1472 . Write the envelope and the headers to a new file.
1474 . Set the name for the header file; close it.
1476 . Set the name for the data file; close it.
1478 Because this function can potentially be called many times in a single
1479 SMTP connection, all store should be got by store_get(), so that it will be
1480 automatically retrieved after the message is accepted.
1482 FUDGE: It seems that sites on the net send out messages with just LF
1483 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1484 we make the CRs optional in all cases.
1486 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1487 new regime is now in place in which bare CRs in header lines are turned into LF
1488 followed by a space, so as not to terminate the header line.
1490 February 2004: A bare LF in a header line in a message whose first line was
1491 terminated by CRLF is treated in the same way as a bare CR.
1494 extract_recip TRUE if recipients are to be extracted from the message's
1497 Returns: TRUE there are more messages to be read (SMTP input)
1498 FALSE there are no more messages to be read (non-SMTP input
1499 or SMTP connection collapsed, or other failure)
1501 When reading a message for filter testing, the returned value indicates
1502 whether the headers (which is all that is read) were terminated by '.' or
1506 receive_msg(BOOL extract_recip)
1511 int process_info_len = Ustrlen(process_info);
1512 int error_rc = (error_handling == ERRORS_SENDER)?
1513 errors_sender_rc : EXIT_FAILURE;
1514 int header_size = 256;
1515 int start, end, domain, size, sptr;
1518 int prevlines_length = 0;
1520 register int ptr = 0;
1522 BOOL contains_resent_headers = FALSE;
1523 BOOL extracted_ignored = FALSE;
1524 BOOL first_line_ended_crlf = TRUE_UNSET;
1525 BOOL smtp_yield = TRUE;
1528 BOOL resents_exist = FALSE;
1529 uschar *resent_prefix = US"";
1530 uschar *blackholed_by = NULL;
1531 uschar *blackhole_log_msg = US"";
1532 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1535 error_block *bad_addresses = NULL;
1537 uschar *frozen_by = NULL;
1538 uschar *queued_by = NULL;
1541 struct stat statbuf;
1543 /* Final message to give to SMTP caller, and messages from ACLs */
1545 uschar *smtp_reply = NULL;
1546 uschar *user_msg, *log_msg;
1548 /* Working header pointers */
1550 header_line *h, *next;
1552 /* Flags for noting the existence of certain headers (only one left) */
1554 BOOL date_header_exists = FALSE;
1556 /* Pointers to receive the addresses of headers whose contents we need. */
1558 header_line *from_header = NULL;
1559 header_line *subject_header = NULL;
1560 header_line *msgid_header = NULL;
1561 header_line *received_header;
1563 #ifdef EXPERIMENTAL_DMARC
1565 #endif /* EXPERIMENTAL_DMARC */
1567 /* Variables for use when building the Received: header. */
1572 /* Release any open files that might have been cached while preparing to
1573 accept the message - e.g. by verifying addresses - because reading a message
1574 might take a fair bit of real time. */
1578 /* Extracting the recipient list from an input file is incompatible with
1579 cutthrough delivery with the no-spool option. It shouldn't be possible
1580 to set up the combination, but just in case kill any ongoing connection. */
1581 if (extract_recip || !smtp_input)
1582 cancel_cutthrough_connection("not smtp input");
1584 /* Initialize the chain of headers by setting up a place-holder for Received:
1585 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1586 pointing to the end of the chain to make adding headers simple. */
1588 received_header = header_list = header_last = store_get(sizeof(header_line));
1589 header_list->next = NULL;
1590 header_list->type = htype_old;
1591 header_list->text = NULL;
1592 header_list->slen = 0;
1594 /* Control block for the next header to be read. */
1596 next = store_get(sizeof(header_line));
1597 next->text = store_get(header_size);
1599 /* Initialize message id to be null (indicating no message read), and the
1600 header names list to be the normal list. Indicate there is no data file open
1601 yet, initialize the size and warning count, and deal with no size limit. */
1609 received_count = 1; /* For the one we will add */
1611 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1613 /* While reading the message, the following counts are computed. */
1615 message_linecount = body_linecount = body_zerocount =
1616 max_received_linelength = 0;
1618 #ifndef DISABLE_DKIM
1619 /* Call into DKIM to set up the context. In CHUNKING mode
1620 we clear the dot-stuffing flag */
1621 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1622 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1625 #ifdef EXPERIMENTAL_DMARC
1626 /* initialize libopendmarc */
1627 dmarc_up = dmarc_init();
1630 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1631 ids, and fractions of a second are required. See the comments that precede the
1632 message id creation below. */
1634 (void)gettimeofday(&message_id_tv, NULL);
1636 /* For other uses of the received time we can operate with granularity of one
1637 second, and for that we use the global variable received_time. This is for
1638 things like ultimate message timeouts. */
1640 received_time = message_id_tv.tv_sec;
1642 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1643 happen in the smtp_getc() function when it refills its buffer. */
1645 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1647 /* If not SMTP input, timeout happens only if configured, and we just set a
1648 single timeout for the whole message. */
1650 else if (receive_timeout > 0)
1652 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1653 alarm(receive_timeout);
1656 /* SIGTERM and SIGINT are caught always. */
1658 signal(SIGTERM, data_sigterm_sigint_handler);
1659 signal(SIGINT, data_sigterm_sigint_handler);
1661 /* Header lines in messages are not supposed to be very long, though when
1662 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1663 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1664 storing the header, and extend this as necessary using string_cat().
1666 To cope with total lunacies, impose an upper limit on the length of the header
1667 section of the message, as otherwise the store will fill up. We must also cope
1668 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1669 Folded header lines are joined into one string, leaving the '\n' characters
1670 inside them, so that writing them out reproduces the input.
1672 Loop for each character of each header; the next structure for chaining the
1673 header is set up already, with ptr the offset of the next character in
1678 int ch = (receive_getc)();
1680 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1681 SMTP must have a correct "." terminator. */
1683 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1685 smtp_reply = handle_lost_connection(US" (header)");
1687 goto TIDYUP; /* Skip to end of function */
1690 /* See if we are at the current header's size limit - there must be at least
1691 four bytes left. This allows for the new character plus a zero, plus two for
1692 extra insertions when we are playing games with dots and carriage returns. If
1693 we are at the limit, extend the text buffer. This could have been done
1694 automatically using string_cat() but because this is a tightish loop storing
1695 only one character at a time, we choose to do it inline. Normally
1696 store_extend() will be able to extend the block; only at the end of a big
1697 store block will a copy be needed. To handle the case of very long headers
1698 (and sometimes lunatic messages can have ones that are 100s of K long) we
1699 call store_release() for strings that have been copied - if the string is at
1700 the start of a block (and therefore the only thing in it, because we aren't
1701 doing any other gets), the block gets freed. We can only do this because we
1702 know there are no other calls to store_get() going on. */
1704 if (ptr >= header_size - 4)
1706 int oldsize = header_size;
1707 /* header_size += 256; */
1709 if (!store_extend(next->text, oldsize, header_size))
1711 uschar *newtext = store_get(header_size);
1712 memcpy(newtext, next->text, ptr);
1713 store_release(next->text);
1714 next->text = newtext;
1718 /* Cope with receiving a binary zero. There is dispute about whether
1719 these should be allowed in RFC 822 messages. The middle view is that they
1720 should not be allowed in headers, at least. Exim takes this attitude at
1721 the moment. We can't just stomp on them here, because we don't know that
1722 this line is a header yet. Set a flag to cause scanning later. */
1724 if (ch == 0) had_zero++;
1726 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1727 those from data files use just LF. Treat LF in local SMTP input as a
1728 terminator too. Treat EOF as a line terminator always. */
1730 if (ch == EOF) goto EOL;
1732 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1733 other MTAs accept this. We are therefore forced into this "liberalisation"
1734 too, so we accept LF as a line terminator whatever the source of the message.
1735 However, if the first line of the message ended with a CRLF, we treat a bare
1736 LF specially by inserting a white space after it to ensure that the header
1737 line is not terminated. */
1741 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1742 else if (first_line_ended_crlf) receive_ungetc(' ');
1746 /* This is not the end of the line. If this is SMTP input and this is
1747 the first character in the line and it is a "." character, ignore it.
1748 This implements the dot-doubling rule, though header lines starting with
1749 dots aren't exactly common. They are legal in RFC 822, though. If the
1750 following is CRLF or LF, this is the line that that terminates the
1751 entire message. We set message_ended to indicate this has happened (to
1752 prevent further reading), and break out of the loop, having freed the
1753 empty header, and set next = NULL to indicate no data line. */
1755 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1757 ch = (receive_getc)();
1760 ch = (receive_getc)();
1764 ch = '\r'; /* Revert to CR */
1769 message_ended = END_DOT;
1772 break; /* End character-reading loop */
1775 /* For non-SMTP input, the dot at the start of the line was really a data
1776 character. What is now in ch is the following character. We guaranteed
1777 enough space for this above. */
1781 next->text[ptr++] = '.';
1786 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1787 remember this case if this is the first line ending. */
1791 ch = (receive_getc)();
1794 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1798 /* Otherwise, put back the character after CR, and turn the bare CR
1801 ch = (receive_ungetc)(ch);
1802 next->text[ptr++] = '\n';
1807 /* We have a data character for the header line. */
1809 next->text[ptr++] = ch; /* Add to buffer */
1810 message_size++; /* Total message size so far */
1812 /* Handle failure due to a humungously long header section. The >= allows
1813 for the terminating \n. Add what we have so far onto the headers list so
1814 that it gets reflected in any error message, and back up the just-read
1817 if (message_size >= header_maxsize)
1819 next->text[ptr] = 0;
1821 next->type = htype_other;
1823 header_last->next = next;
1826 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1827 "%s (more than %d characters): message abandoned",
1828 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1832 smtp_reply = US"552 Message header is ridiculously long";
1833 receive_swallow_smtp();
1834 goto TIDYUP; /* Skip to end of function */
1839 give_local_error(ERRMESS_VLONGHEADER,
1840 string_sprintf("message header longer than %d characters received: "
1841 "message not accepted", header_maxsize), US"", error_rc, stdin,
1843 /* Does not return */
1847 continue; /* With next input character */
1849 /* End of header line reached */
1853 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1855 receive_linecount++;
1856 message_linecount++;
1858 /* Keep track of maximum line length */
1860 if (ptr - prevlines_length > max_received_linelength)
1861 max_received_linelength = ptr - prevlines_length;
1862 prevlines_length = ptr + 1;
1864 /* Now put in the terminating newline. There is always space for
1865 at least two more characters. */
1867 next->text[ptr++] = '\n';
1870 /* A blank line signals the end of the headers; release the unwanted
1871 space and set next to NULL to indicate this. */
1880 /* There is data in the line; see if the next input character is a
1881 whitespace character. If it is, we have a continuation of this header line.
1882 There is always space for at least one character at this point. */
1886 int nextch = (receive_getc)();
1887 if (nextch == ' ' || nextch == '\t')
1889 next->text[ptr++] = nextch;
1891 continue; /* Iterate the loop */
1893 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1894 else ch = EOF; /* Cause main loop to exit at end */
1897 /* We have got to the real line end. Terminate the string and release store
1898 beyond it. If it turns out to be a real header, internal binary zeros will
1899 be squashed later. */
1901 next->text[ptr] = 0;
1903 store_reset(next->text + ptr + 1);
1905 /* Check the running total size against the overall message size limit. We
1906 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1907 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1908 headers - the code to read the body will then also hit the buffer. */
1910 if (message_size > thismessage_size_limit) break;
1912 /* A line that is not syntactically correct for a header also marks
1913 the end of the headers. In this case, we leave next containing the
1914 first data line. This might actually be several lines because of the
1915 continuation logic applied above, but that doesn't matter.
1917 It turns out that smail, and presumably sendmail, accept leading lines
1920 From ph10 Fri Jan 5 12:35 GMT 1996
1922 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1923 find any documentation of this, but for compatibility it had better be
1924 accepted. Exim restricts it to the case of non-smtp messages, and
1925 treats it as an alternative to the -f command line option. Thus it is
1926 ignored except for trusted users or filter testing. Otherwise it is taken
1927 as the sender address, unless -f was used (sendmail compatibility).
1929 It further turns out that some UUCPs generate the From_line in a different
1932 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1934 The regex for matching these things is now capable of recognizing both
1935 formats (including 2- and 4-digit years in the latter). In fact, the regex
1936 is now configurable, as is the expansion string to fish out the sender.
1938 Even further on it has been discovered that some broken clients send
1939 these lines in SMTP messages. There is now an option to ignore them from
1940 specified hosts or networks. Sigh. */
1942 if (header_last == header_list &&
1945 (sender_host_address != NULL &&
1946 verify_check_host(&ignore_fromline_hosts) == OK)
1948 (sender_host_address == NULL && ignore_fromline_local)
1950 regex_match_and_setup(regex_From, next->text, 0, -1))
1952 if (!sender_address_forced)
1954 uschar *uucp_sender = expand_string(uucp_from_sender);
1955 if (uucp_sender == NULL)
1957 log_write(0, LOG_MAIN|LOG_PANIC,
1958 "expansion of \"%s\" failed after matching "
1959 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1963 int start, end, domain;
1965 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1966 &start, &end, &domain, TRUE);
1967 if (newsender != NULL)
1969 if (domain == 0 && newsender[0] != 0)
1970 newsender = rewrite_address_qualify(newsender, FALSE);
1972 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1974 sender_address = newsender;
1976 if (trusted_caller || filter_test != FTEST_NONE)
1978 authenticated_sender = NULL;
1979 originator_name = US"";
1980 sender_local = FALSE;
1983 if (filter_test != FTEST_NONE)
1984 printf("Sender taken from \"From \" line\n");
1991 /* Not a leading "From " line. Check to see if it is a valid header line.
1992 Header names may contain any non-control characters except space and colon,
1997 uschar *p = next->text;
1999 /* If not a valid header line, break from the header reading loop, leaving
2000 next != NULL, indicating that it holds the first line of the body. */
2002 if (isspace(*p)) break;
2003 while (mac_isgraph(*p) && *p != ':') p++;
2004 while (isspace(*p)) p++;
2007 body_zerocount = had_zero;
2011 /* We have a valid header line. If there were any binary zeroes in
2012 the line, stomp on them here. */
2015 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2017 /* It is perfectly legal to have an empty continuation line
2018 at the end of a header, but it is confusing to humans
2019 looking at such messages, since it looks like a blank line.
2020 Reduce confusion by removing redundant white space at the
2021 end. We know that there is at least one printing character
2022 (the ':' tested for above) so there is no danger of running
2025 p = next->text + ptr - 2;
2028 while (*p == ' ' || *p == '\t') p--;
2029 if (*p != '\n') break;
2030 ptr = (p--) - next->text + 1;
2031 message_size -= next->slen - ptr;
2032 next->text[ptr] = 0;
2036 /* Add the header to the chain */
2038 next->type = htype_other;
2040 header_last->next = next;
2043 /* Check the limit for individual line lengths. This comes after adding to
2044 the chain so that the failing line is reflected if a bounce is generated
2045 (for a local message). */
2047 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2049 log_write(0, LOG_MAIN, "overlong message header line received from "
2050 "%s (more than %d characters): message abandoned",
2051 sender_host_unknown? sender_ident : sender_fullhost,
2052 header_line_maxsize);
2056 smtp_reply = US"552 A message header line is too long";
2057 receive_swallow_smtp();
2058 goto TIDYUP; /* Skip to end of function */
2063 give_local_error(ERRMESS_VLONGHDRLINE,
2064 string_sprintf("message header line longer than %d characters "
2065 "received: message not accepted", header_line_maxsize), US"",
2066 error_rc, stdin, header_list->next);
2067 /* Does not return */
2071 /* Note if any resent- fields exist. */
2073 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2075 resents_exist = TRUE;
2076 resent_prefix = US"Resent-";
2080 /* The line has been handled. If we have hit EOF, break out of the loop,
2081 indicating no pending data line. */
2083 if (ch == EOF) { next = NULL; break; }
2085 /* Set up for the next header */
2088 next = store_get(sizeof(header_line));
2089 next->text = store_get(header_size);
2092 prevlines_length = 0;
2093 } /* Continue, starting to read the next header */
2095 /* At this point, we have read all the headers into a data structure in main
2096 store. The first header is still the dummy placeholder for the Received: header
2097 we are going to generate a bit later on. If next != NULL, it contains the first
2098 data line - which terminated the headers before reaching a blank line (not the
2103 debug_printf(">>Headers received:\n");
2104 for (h = header_list->next; h != NULL; h = h->next)
2105 debug_printf("%s", h->text);
2109 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2110 is dropped immediately after valid headers, the next thing we will see is EOF.
2111 We must test for this specially, as further down the reading of the data is
2112 skipped if already at EOF. */
2114 if (smtp_input && (receive_feof)())
2116 smtp_reply = handle_lost_connection(US" (after header)");
2118 goto TIDYUP; /* Skip to end of function */
2121 /* If this is a filter test run and no headers were read, output a warning
2122 in case there is a mistake in the test message. */
2124 if (filter_test != FTEST_NONE && header_list->next == NULL)
2125 printf("Warning: no message headers read\n");
2128 /* Scan the headers to identify them. Some are merely marked for later
2129 processing; some are dealt with here. */
2131 for (h = header_list->next; h != NULL; h = h->next)
2133 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2134 if (is_resent) contains_resent_headers = TRUE;
2136 switch (header_checkname(h, is_resent))
2139 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2143 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2146 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2149 if (!resents_exist || is_resent) date_header_exists = TRUE;
2152 /* Same comments as about Return-Path: below. */
2154 case htype_delivery_date:
2155 if (delivery_date_remove) h->type = htype_old;
2158 /* Same comments as about Return-Path: below. */
2160 case htype_envelope_to:
2161 if (envelope_to_remove) h->type = htype_old;
2164 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2165 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2166 header consists of just the login id of the user who called Exim, rewrite
2167 it with the gecos field first. Apply this rule to Resent-From: if there
2168 are resent- fields. */
2171 h->type = htype_from;
2172 if (!resents_exist || is_resent)
2178 uschar *s = Ustrchr(h->text, ':') + 1;
2179 while (isspace(*s)) s++;
2180 len = h->slen - (s - h->text) - 1;
2181 if (Ustrlen(originator_login) == len &&
2182 strncmpic(s, originator_login, len) == 0)
2184 uschar *name = is_resent? US"Resent-From" : US"From";
2185 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2186 originator_login, qualify_domain_sender);
2187 from_header = header_last;
2188 h->type = htype_old;
2189 DEBUG(D_receive|D_rewrite)
2190 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2196 /* Identify the Message-id: header for generating "in-reply-to" in the
2197 autoreply transport. For incoming logging, save any resent- value. In both
2198 cases, take just the first of any multiples. */
2201 if (msgid_header == NULL && (!resents_exist || is_resent))
2208 /* Flag all Received: headers */
2210 case htype_received:
2211 h->type = htype_received;
2215 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2217 case htype_reply_to:
2218 h->type = htype_reply_to;
2221 /* The Return-path: header is supposed to be added to messages when
2222 they leave the SMTP system. We shouldn't receive messages that already
2223 contain Return-path. However, since Exim generates Return-path: on
2224 local delivery, resent messages may well contain it. We therefore
2225 provide an option (which defaults on) to remove any Return-path: headers
2226 on input. Removal actually means flagging as "old", which prevents the
2227 header being transmitted with the message. */
2229 case htype_return_path:
2230 if (return_path_remove) h->type = htype_old;
2232 /* If we are testing a mail filter file, use the value of the
2233 Return-Path: header to set up the return_path variable, which is not
2234 otherwise set. However, remove any <> that surround the address
2235 because the variable doesn't have these. */
2237 if (filter_test != FTEST_NONE)
2239 uschar *start = h->text + 12;
2240 uschar *end = start + Ustrlen(start);
2241 while (isspace(*start)) start++;
2242 while (end > start && isspace(end[-1])) end--;
2243 if (*start == '<' && end[-1] == '>')
2248 return_path = string_copyn(start, end - start);
2249 printf("Return-path taken from \"Return-path:\" header line\n");
2253 /* If there is a "Sender:" header and the message is locally originated,
2254 and from an untrusted caller and suppress_local_fixups is not set, or if we
2255 are in submission mode for a remote message, mark it "old" so that it will
2256 not be transmitted with the message, unless active_local_sender_retain is
2257 set. (This can only be true if active_local_from_check is false.) If there
2258 are any resent- headers in the message, apply this rule to Resent-Sender:
2259 instead of Sender:. Messages with multiple resent- header sets cannot be
2260 tidily handled. (For this reason, at least one MUA - Pine - turns old
2261 resent- headers into X-resent- headers when resending, leaving just one
2265 h->type = ((!active_local_sender_retain &&
2267 (sender_local && !trusted_caller && !suppress_local_fixups)
2271 (!resents_exist||is_resent))?
2272 htype_old : htype_sender;
2275 /* Remember the Subject: header for logging. There is no Resent-Subject */
2281 /* "To:" gets flagged, and the existence of a recipient header is noted,
2282 whether it's resent- or not. */
2287 to_or_cc_header_exists = TRUE;
2293 /* Extract recipients from the headers if that is required (the -t option).
2294 Note that this is documented as being done *before* any address rewriting takes
2295 place. There are two possibilities:
2297 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2298 recipients already listed are to be REMOVED from the message. Smail 3 works
2299 like this. We need to build a non-recipients tree for that list, because in
2300 subsequent processing this data is held in a tree and that's what the
2301 spool_write_header() function expects. Make sure that non-recipient addresses
2302 are fully qualified and rewritten if necessary.
2304 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2305 those in the command line arguments (and it is rumoured some other MTAs do
2306 this). Therefore, there is an option to make Exim behave this way.
2308 *** Notes on "Resent-" header lines ***
2310 The presence of resent-headers in the message makes -t horribly ambiguous.
2311 Experiments with sendmail showed that it uses recipients for all resent-
2312 headers, totally ignoring the concept of "sets of resent- headers" as described
2313 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2314 with all the addresses in one instance of each header.
2316 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2317 error for -t if there were resent- headers in the message. However, after a
2318 discussion on the mailing list, I've learned that there are MUAs that use
2319 resent- headers with -t, and also that the stuff about sets of resent- headers
2320 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2321 message with -t and resent- header lines makes sure that only *its* resent-
2322 headers are present; previous ones are often renamed as X-resent- for example.
2324 Consequently, Exim has been changed so that, if any resent- header lines are
2325 present, the recipients are taken from all of the appropriate resent- lines,
2326 and not from the ordinary To:, Cc:, etc. */
2331 error_block **bnext = &bad_addresses;
2333 if (extract_addresses_remove_arguments)
2335 while (recipients_count-- > 0)
2337 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2338 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2339 tree_add_nonrecipient(s);
2341 recipients_list = NULL;
2342 recipients_count = recipients_list_max = 0;
2345 /* Now scan the headers */
2347 for (h = header_list->next; h != NULL; h = h->next)
2349 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2350 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2352 uschar *s = Ustrchr(h->text, ':') + 1;
2353 while (isspace(*s)) s++;
2355 parse_allow_group = TRUE; /* Allow address group syntax */
2359 uschar *ss = parse_find_address_end(s, FALSE);
2360 uschar *recipient, *errmess, *p, *pp;
2361 int start, end, domain;
2363 /* Check on maximum */
2365 if (recipients_max > 0 && ++rcount > recipients_max)
2367 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2368 US"message rejected: ", error_rc, stdin, NULL);
2369 /* Does not return */
2372 /* Make a copy of the address, and remove any internal newlines. These
2373 may be present as a result of continuations of the header line. The
2374 white space that follows the newline must not be removed - it is part
2377 pp = recipient = store_get(ss - s + 1);
2378 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2383 BOOL b = allow_utf8_domains;
2384 allow_utf8_domains = TRUE;
2386 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2390 if (string_is_utf8(recipient))
2391 message_smtputf8 = TRUE;
2393 allow_utf8_domains = b;
2397 /* Keep a list of all the bad addresses so we can send a single
2398 error message at the end. However, an empty address is not an error;
2399 just ignore it. This can come from an empty group list like
2401 To: Recipients of list:;
2403 If there are no recipients at all, an error will occur later. */
2405 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2407 int len = Ustrlen(s);
2408 error_block *b = store_get(sizeof(error_block));
2409 while (len > 0 && isspace(s[len-1])) len--;
2411 b->text1 = string_printing(string_copyn(s, len));
2417 /* If the recipient is already in the nonrecipients tree, it must
2418 have appeared on the command line with the option extract_addresses_
2419 remove_arguments set. Do not add it to the recipients, and keep a note
2420 that this has happened, in order to give a better error if there are
2421 no recipients left. */
2423 else if (recipient != NULL)
2425 if (tree_search(tree_nonrecipients, recipient) == NULL)
2426 receive_add_recipient(recipient, -1);
2428 extracted_ignored = TRUE;
2431 /* Move on past this address */
2433 s = ss + (*ss? 1:0);
2434 while (isspace(*s)) s++;
2435 } /* Next address */
2437 parse_allow_group = FALSE; /* Reset group syntax flags */
2438 parse_found_group = FALSE;
2440 /* If this was the bcc: header, mark it "old", which means it
2441 will be kept on the spool, but not transmitted as part of the
2444 if (h->type == htype_bcc) h->type = htype_old;
2445 } /* For appropriate header line */
2446 } /* For each header line */
2450 /* Now build the unique message id. This has changed several times over the
2451 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2452 Retaining all the history in the comment has become too unwieldy - read
2453 previous release sources if you want it.
2455 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2456 The first part is the current time, in seconds. The second part is the current
2457 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2458 can hold a number in the range 0-3843. It used to be a computed sequence
2459 number, but is now the fractional component of the current time in units of
2460 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2461 received, Exim ensures that the timer has ticked at the appropriate level
2462 before proceeding, to avoid duplication if the pid happened to be re-used
2463 within the same time period. It seems likely that most messages will take at
2464 least half a millisecond to be received, so no delay will normally be
2465 necessary. At least for some time...
2467 There is a modification when localhost_number is set. Formerly this was allowed
2468 to be as large as 255. Now it is restricted to the range 0-16, and the final
2469 component of the message id becomes (localhost_number * 200) + fractional time
2470 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2472 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2473 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2474 still allows the tttttt field to hold a large enough number to last for some
2475 more decades, and the final two-digit field can hold numbers up to 1295, which
2476 is enough for milliseconds (instead of 1/2000 of a second).
2478 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2479 pid, so it is probably safe because pids have to be positive. The
2480 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2481 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2483 Note that string_base62() returns its data in a static storage block, so it
2484 must be copied before calling string_base62() again. It always returns exactly
2487 There doesn't seem to be anything in the RFC which requires a message id to
2488 start with a letter, but Smail was changed to ensure this. The external form of
2489 the message id (as supplied by string expansion) therefore starts with an
2490 additional leading 'E'. The spool file names do not include this leading
2491 letter and it is not used internally.
2493 NOTE: If ever the format of message ids is changed, the regular expression for
2494 checking that a string is in this format must be updated in a corresponding
2495 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2496 must also be changed to reflect the correct string length. Then, of course,
2497 other programs that rely on the message id format will need updating too. */
2499 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2500 message_id[6] = '-';
2501 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2503 /* Deal with the case where the host number is set. The value of the number was
2504 checked when it was read, to ensure it isn't too big. The timing granularity is
2505 left in id_resolution so that an appropriate wait can be done after receiving
2506 the message, if necessary (we hope it won't be). */
2508 if (host_number_string != NULL)
2510 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2511 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2512 string_base62((long int)(
2513 host_number * (1000000/id_resolution) +
2514 message_id_tv.tv_usec/id_resolution)) + 4);
2517 /* Host number not set: final field is just the fractional time at an
2518 appropriate resolution. */
2522 id_resolution = (BASE_62 == 62)? 500 : 1000;
2523 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2524 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2527 /* Add the current message id onto the current process info string if
2530 (void)string_format(process_info + process_info_len,
2531 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2533 /* If we are using multiple input directories, set up the one for this message
2534 to be the least significant base-62 digit of the time of arrival. Otherwise
2535 ensure that it is an empty string. */
2537 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2539 /* Now that we have the message-id, if there is no message-id: header, generate
2540 one, but only for local (without suppress_local_fixups) or submission mode
2541 messages. This can be user-configured if required, but we had better flatten
2542 any illegal characters therein. */
2544 if (msgid_header == NULL &&
2545 ((sender_host_address == NULL && !suppress_local_fixups)
2546 || submission_mode))
2549 uschar *id_text = US"";
2550 uschar *id_domain = primary_hostname;
2552 /* Permit only letters, digits, dots, and hyphens in the domain */
2554 if (message_id_domain != NULL)
2556 uschar *new_id_domain = expand_string(message_id_domain);
2557 if (new_id_domain == NULL)
2559 if (!expand_string_forcedfail)
2560 log_write(0, LOG_MAIN|LOG_PANIC,
2561 "expansion of \"%s\" (message_id_header_domain) "
2562 "failed: %s", message_id_domain, expand_string_message);
2564 else if (*new_id_domain != 0)
2566 id_domain = new_id_domain;
2567 for (p = id_domain; *p != 0; p++)
2568 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2572 /* Permit all characters except controls and RFC 2822 specials in the
2573 additional text part. */
2575 if (message_id_text != NULL)
2577 uschar *new_id_text = expand_string(message_id_text);
2578 if (new_id_text == NULL)
2580 if (!expand_string_forcedfail)
2581 log_write(0, LOG_MAIN|LOG_PANIC,
2582 "expansion of \"%s\" (message_id_header_text) "
2583 "failed: %s", message_id_text, expand_string_message);
2585 else if (*new_id_text != 0)
2587 id_text = new_id_text;
2588 for (p = id_text; *p != 0; p++)
2589 if (mac_iscntrl_or_special(*p)) *p = '-';
2593 /* Add the header line
2594 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2595 * appended, to preserve classical expectations of header ordering. */
2597 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2598 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2599 (*id_text == 0)? "" : ".", id_text, id_domain);
2602 /* If we are to log recipients, keep a copy of the raw ones before any possible
2603 rewriting. Must copy the count, because later ACLs and the local_scan()
2604 function may mess with the real recipients. */
2606 if (LOGGING(received_recipients))
2608 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2609 for (i = 0; i < recipients_count; i++)
2610 raw_recipients[i] = string_copy(recipients_list[i].address);
2611 raw_recipients_count = recipients_count;
2614 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2615 recipients will get here only if the conditions were right (allow_unqualified_
2616 recipient is TRUE). */
2618 for (i = 0; i < recipients_count; i++)
2619 recipients_list[i].address =
2620 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2621 global_rewrite_rules, rewrite_existflags);
2623 /* If there is no From: header, generate one for local (without
2624 suppress_local_fixups) or submission_mode messages. If there is no sender
2625 address, but the sender is local or this is a local delivery error, use the
2626 originator login. This shouldn't happen for genuine bounces, but might happen
2627 for autoreplies. The addition of From: must be done *before* checking for the
2628 possible addition of a Sender: header, because untrusted_set_sender allows an
2629 untrusted user to set anything in the envelope (which might then get info
2630 From:) but we still want to ensure a valid Sender: if it is required. */
2632 if (from_header == NULL &&
2633 ((sender_host_address == NULL && !suppress_local_fixups)
2634 || submission_mode))
2636 uschar *oname = US"";
2638 /* Use the originator_name if this is a locally submitted message and the
2639 caller is not trusted. For trusted callers, use it only if -F was used to
2640 force its value or if we have a non-SMTP message for which -f was not used
2641 to set the sender. */
2643 if (sender_host_address == NULL)
2645 if (!trusted_caller || sender_name_forced ||
2646 (!smtp_input && !sender_address_forced))
2647 oname = originator_name;
2650 /* For non-locally submitted messages, the only time we use the originator
2651 name is when it was forced by the /name= option on control=submission. */
2655 if (submission_name != NULL) oname = submission_name;
2658 /* Envelope sender is empty */
2660 if (sender_address[0] == 0)
2662 uschar *fromstart, *fromend;
2664 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2665 oname, (oname[0] == 0)? "" : " <");
2666 fromend = (oname[0] == 0)? US"" : US">";
2668 if (sender_local || local_error_message)
2670 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2671 local_part_quote(originator_login), qualify_domain_sender,
2674 else if (submission_mode && authenticated_id != NULL)
2676 if (submission_domain == NULL)
2678 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2679 local_part_quote(authenticated_id), qualify_domain_sender,
2682 else if (submission_domain[0] == 0) /* empty => whole address set */
2684 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2689 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2690 local_part_quote(authenticated_id), submission_domain,
2693 from_header = header_last; /* To get it checked for Sender: */
2697 /* There is a non-null envelope sender. Build the header using the original
2698 sender address, before any rewriting that might have been done while
2703 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2705 (oname[0] == 0)? "" : " <",
2706 (sender_address_unrewritten == NULL)?
2707 sender_address : sender_address_unrewritten,
2708 (oname[0] == 0)? "" : ">");
2710 from_header = header_last; /* To get it checked for Sender: */
2715 /* If the sender is local (without suppress_local_fixups), or if we are in
2716 submission mode and there is an authenticated_id, check that an existing From:
2717 is correct, and if not, generate a Sender: header, unless disabled. Any
2718 previously-existing Sender: header was removed above. Note that sender_local,
2719 as well as being TRUE if the caller of exim is not trusted, is also true if a
2720 trusted caller did not supply a -f argument for non-smtp input. To allow
2721 trusted callers to forge From: without supplying -f, we have to test explicitly
2722 here. If the From: header contains more than one address, then the call to
2723 parse_extract_address fails, and a Sender: header is inserted, as required. */
2725 if (from_header != NULL &&
2726 (active_local_from_check &&
2727 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2728 (submission_mode && authenticated_id != NULL))
2731 BOOL make_sender = TRUE;
2732 int start, end, domain;
2734 uschar *from_address =
2735 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2736 &start, &end, &domain, FALSE);
2737 uschar *generated_sender_address;
2739 if (submission_mode)
2741 if (submission_domain == NULL)
2743 generated_sender_address = string_sprintf("%s@%s",
2744 local_part_quote(authenticated_id), qualify_domain_sender);
2746 else if (submission_domain[0] == 0) /* empty => full address */
2748 generated_sender_address = string_sprintf("%s",
2753 generated_sender_address = string_sprintf("%s@%s",
2754 local_part_quote(authenticated_id), submission_domain);
2758 generated_sender_address = string_sprintf("%s@%s",
2759 local_part_quote(originator_login), qualify_domain_sender);
2761 /* Remove permitted prefixes and suffixes from the local part of the From:
2762 address before doing the comparison with the generated sender. */
2764 if (from_address != NULL)
2767 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2769 if (at != NULL) *at = 0;
2770 from_address += route_check_prefix(from_address, local_from_prefix);
2771 slen = route_check_suffix(from_address, local_from_suffix);
2774 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2775 from_address += slen;
2777 if (at != NULL) *at = '@';
2779 if (strcmpic(generated_sender_address, from_address) == 0 ||
2780 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2781 make_sender = FALSE;
2784 /* We have to cause the Sender header to be rewritten if there are
2785 appropriate rewriting rules. */
2789 if (submission_mode && submission_name == NULL)
2790 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2791 generated_sender_address);
2793 header_add(htype_sender, "%sSender: %s <%s>\n",
2795 submission_mode? submission_name : originator_name,
2796 generated_sender_address);
2799 /* Ensure that a non-null envelope sender address corresponds to the
2800 submission mode sender address. */
2802 if (submission_mode && sender_address[0] != 0)
2804 if (sender_address_unrewritten == NULL)
2805 sender_address_unrewritten = sender_address;
2806 sender_address = generated_sender_address;
2807 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2808 log_write(L_address_rewrite, LOG_MAIN,
2809 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2810 sender_address_unrewritten, generated_sender_address);
2814 /* If there are any rewriting rules, apply them to the sender address, unless
2815 it has already been rewritten as part of verification for SMTP input. */
2817 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2818 sender_address[0] != 0)
2820 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2821 global_rewrite_rules, rewrite_existflags);
2822 DEBUG(D_receive|D_rewrite)
2823 debug_printf("rewritten sender = %s\n", sender_address);
2827 /* The headers must be run through rewrite_header(), because it ensures that
2828 addresses are fully qualified, as well as applying any rewriting rules that may
2831 Qualification of header addresses in a message from a remote host happens only
2832 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2833 appropriate. For local messages, qualification always happens, unless -bnq is
2834 used to explicitly suppress it. No rewriting is done for an unqualified address
2835 that is left untouched.
2837 We start at the second header, skipping our own Received:. This rewriting is
2838 documented as happening *after* recipient addresses are taken from the headers
2839 by the -t command line option. An added Sender: gets rewritten here. */
2841 for (h = header_list->next; h != NULL; h = h->next)
2843 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2844 rewrite_existflags, TRUE);
2845 if (newh != NULL) h = newh;
2849 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2850 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2851 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2852 exists, this applies to the set of resent- headers rather than the normal set.
2854 The requirement for a recipient header has been removed in RFC 2822. At this
2855 point in the code, earlier versions of Exim added a To: header for locally
2856 submitted messages, and an empty Bcc: header for others. In the light of the
2857 changes in RFC 2822, this was dropped in November 2003. */
2860 /* If there is no date header, generate one if the message originates locally
2861 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2862 submission mode flag is set. Messages without Date: are not valid, but it seems
2863 to be more confusing if Exim adds one to all remotely-originated messages.
2864 As per Message-Id, we prepend if resending, else append.
2867 if (!date_header_exists &&
2868 ((sender_host_address == NULL && !suppress_local_fixups)
2869 || submission_mode))
2870 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2871 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2873 search_tidyup(); /* Free any cached resources */
2875 /* Show the complete set of headers if debugging. Note that the first one (the
2876 new Received:) has not yet been set. */
2880 debug_printf(">>Headers after rewriting and local additions:\n");
2881 for (h = header_list->next; h != NULL; h = h->next)
2882 debug_printf("%c %s", h->type, h->text);
2886 /* The headers are now complete in store. If we are running in filter
2887 testing mode, that is all this function does. Return TRUE if the message
2888 ended with a dot. */
2890 if (filter_test != FTEST_NONE)
2892 process_info[process_info_len] = 0;
2893 return message_ended == END_DOT;
2896 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2897 think more if it could be handled. Cannot do onward CHUNKING unless
2898 inbound is, but inbound chunking ought to be ok with outbound plain.
2899 Could we do onward CHUNKING given inbound CHUNKING?
2901 if (chunking_state > CHUNKING_OFFERED)
2902 cancel_cutthrough_connection("chunking active");
2904 /* Cutthrough delivery:
2905 We have to create the Received header now rather than at the end of reception,
2906 so the timestamp behaviour is a change to the normal case.
2907 XXX Ensure this gets documented XXX.
2908 Having created it, send the headers to the destination. */
2909 if (cutthrough.fd >= 0)
2911 if (received_count > received_headers_max)
2913 cancel_cutthrough_connection("too many headers");
2914 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2915 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2916 "Too many \"Received\" headers",
2918 (sender_fullhost == NULL)? "" : " H=",
2919 (sender_fullhost == NULL)? US"" : sender_fullhost,
2920 (sender_ident == NULL)? "" : " U=",
2921 (sender_ident == NULL)? US"" : sender_ident);
2922 message_id[0] = 0; /* Indicate no message accepted */
2923 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2924 goto TIDYUP; /* Skip to end of function */
2926 received_header_gen();
2927 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2928 (void) cutthrough_headers_send();
2932 /* Open a new spool file for the data portion of the message. We need
2933 to access it both via a file descriptor and a stream. Try to make the
2934 directory if it isn't there. */
2936 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
2937 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
2939 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
2941 if (errno == ENOENT)
2943 (void) directory_make(spool_directory,
2944 spool_sname(US"input", message_subdir),
2945 INPUT_DIRECTORY_MODE, TRUE);
2946 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2949 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2950 spool_name, strerror(errno));
2953 /* Make sure the file's group is the Exim gid, and double-check the mode
2954 because the group setting doesn't always get set automatically. */
2956 if (fchown(data_fd, exim_uid, exim_gid))
2957 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2958 "Failed setting ownership on spool file %s: %s",
2959 spool_name, strerror(errno));
2960 (void)fchmod(data_fd, SPOOL_MODE);
2962 /* We now have data file open. Build a stream for it and lock it. We lock only
2963 the first line of the file (containing the message ID) because otherwise there
2964 are problems when Exim is run under Cygwin (I'm told). See comments in
2965 spool_in.c, where the same locking is done. */
2967 data_file = fdopen(data_fd, "w+");
2968 lock_data.l_type = F_WRLCK;
2969 lock_data.l_whence = SEEK_SET;
2970 lock_data.l_start = 0;
2971 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2973 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2974 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2975 errno, strerror(errno));
2977 /* We have an open, locked data file. Write the message id to it to make it
2978 self-identifying. Then read the remainder of the input of this message and
2979 write it to the data file. If the variable next != NULL, it contains the first
2980 data line (which was read as a header but then turned out not to have the right
2981 format); write it (remembering that it might contain binary zeros). The result
2982 of fwrite() isn't inspected; instead we call ferror() below. */
2984 fprintf(data_file, "%s-D\n", message_id);
2987 uschar *s = next->text;
2988 int len = next->slen;
2989 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2990 body_linecount++; /* Assumes only 1 line */
2993 /* Note that we might already be at end of file, or the logical end of file
2994 (indicated by '.'), or might have encountered an error while writing the
2995 message id or "next" line. */
2997 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3001 message_ended = chunking_state > CHUNKING_OFFERED
3002 ? read_message_bdat_smtp(data_file)
3003 : read_message_data_smtp(data_file);
3004 receive_linecount++; /* The terminating "." line */
3006 else message_ended = read_message_data(data_file);
3008 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3009 message_linecount += body_linecount;
3011 switch (message_ended)
3013 /* Handle premature termination of SMTP */
3018 Uunlink(spool_name); /* Lose data file when closed */
3019 cancel_cutthrough_connection("sender closed connection");
3020 message_id[0] = 0; /* Indicate no message accepted */
3021 smtp_reply = handle_lost_connection(US"");
3023 goto TIDYUP; /* Skip to end of function */
3027 /* Handle message that is too big. Don't use host_or_ident() in the log
3028 message; we want to see the ident value even for non-remote messages. */
3031 Uunlink(spool_name); /* Lose the data file when closed */
3032 cancel_cutthrough_connection("mail too big");
3033 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3035 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3036 "message too big: read=%d max=%d",
3038 (sender_fullhost == NULL)? "" : " H=",
3039 (sender_fullhost == NULL)? US"" : sender_fullhost,
3040 (sender_ident == NULL)? "" : " U=",
3041 (sender_ident == NULL)? US"" : sender_ident,
3043 thismessage_size_limit);
3047 smtp_reply = US"552 Message size exceeds maximum permitted";
3048 message_id[0] = 0; /* Indicate no message accepted */
3049 goto TIDYUP; /* Skip to end of function */
3053 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3054 give_local_error(ERRMESS_TOOBIG,
3055 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3056 US"message rejected: ", error_rc, data_file, header_list);
3057 /* Does not return */
3061 /* Handle bad BDAT protocol sequence */
3064 Uunlink(spool_name); /* Lose the data file when closed */
3065 cancel_cutthrough_connection("sender protocol error");
3066 smtp_reply = US""; /* Response already sent */
3067 message_id[0] = 0; /* Indicate no message accepted */
3068 goto TIDYUP; /* Skip to end of function */
3072 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3073 example, there may be some expansion in an ACL that uses a timer.) */
3075 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3077 /* The message body has now been read into the data file. Call fflush() to
3078 empty the buffers in C, and then call fsync() to get the data written out onto
3079 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3080 having to do this). If there was an I/O error on either input or output,
3081 attempt to send an error message, and unlink the spool file. For non-SMTP input
3082 we can then give up. Note that for SMTP input we must swallow the remainder of
3083 the input in cases of output errors, since the far end doesn't expect to see
3084 anything until the terminating dot line is sent. */
3086 if (fflush(data_file) == EOF || ferror(data_file) ||
3087 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3089 uschar *msg_errno = US strerror(errno);
3090 BOOL input_error = (receive_ferror)() != 0;
3091 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3092 input_error? "Input read" : "Spool write",
3094 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3096 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3097 Uunlink(spool_name); /* Lose the data file */
3098 cancel_cutthrough_connection("error writing spoolfile");
3103 smtp_reply = US"451 Error while reading input data";
3106 smtp_reply = US"451 Error while writing spool file";
3107 receive_swallow_smtp();
3109 message_id[0] = 0; /* Indicate no message accepted */
3110 goto TIDYUP; /* Skip to end of function */
3115 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3116 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3118 /* Does not return */
3123 /* No I/O errors were encountered while writing the data file. */
3125 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3128 /* If there were any bad addresses extracted by -t, or there were no recipients
3129 left after -t, send a message to the sender of this message, or write it to
3130 stderr if the error handling option is set that way. Note that there may
3131 legitimately be no recipients for an SMTP message if they have all been removed
3134 We need to rewind the data file in order to read it. In the case of no
3135 recipients or stderr error writing, throw the data file away afterwards, and
3136 exit. (This can't be SMTP, which always ensures there's at least one
3137 syntactically good recipient address.) */
3139 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3143 if (recipients_count == 0) debug_printf("*** No recipients\n");
3144 if (bad_addresses != NULL)
3146 error_block *eblock = bad_addresses;
3147 debug_printf("*** Bad address(es)\n");
3148 while (eblock != NULL)
3150 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3151 eblock = eblock->next;
3156 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3158 /* If configured to send errors to the sender, but this fails, force
3159 a failure error code. We use a special one for no recipients so that it
3160 can be detected by the autoreply transport. Otherwise error_rc is set to
3161 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3162 it is EXIT_SUCCESS. */
3164 if (error_handling == ERRORS_SENDER)
3166 if (!moan_to_sender(
3167 (bad_addresses == NULL)?
3168 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3169 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3170 bad_addresses, header_list, data_file, FALSE))
3171 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3175 if (bad_addresses == NULL)
3177 if (extracted_ignored)
3178 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3180 fprintf(stderr, "exim: no recipients in message\n");
3184 fprintf(stderr, "exim: invalid address%s",
3185 (bad_addresses->next == NULL)? ":" : "es:\n");
3186 while (bad_addresses != NULL)
3188 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3189 bad_addresses->text2);
3190 bad_addresses = bad_addresses->next;
3195 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3197 Uunlink(spool_name);
3198 (void)fclose(data_file);
3199 exim_exit(error_rc);
3203 /* Data file successfully written. Generate text for the Received: header by
3204 expanding the configured string, and adding a timestamp. By leaving this
3205 operation till now, we ensure that the timestamp is the time that message
3206 reception was completed. However, this is deliberately done before calling the
3207 data ACL and local_scan().
3209 This Received: header may therefore be inspected by the data ACL and by code in
3210 the local_scan() function. When they have run, we update the timestamp to be
3211 the final time of reception.
3213 If there is just one recipient, set up its value in the $received_for variable
3214 for use when we generate the Received: header.
3216 Note: the checking for too many Received: headers is handled by the delivery
3218 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3220 if (received_header->text == NULL) /* Non-cutthrough case */
3222 received_header_gen();
3224 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3226 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3227 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3229 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3230 now, before running the DATA ACL. */
3232 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3235 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3236 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3238 /* If an ACL is specified for checking things at this stage of reception of a
3239 message, run it, unless all the recipients were removed by "discard" in earlier
3240 ACLs. That is the only case in which recipients_count can be zero at this
3241 stage. Set deliver_datafile to point to the data file so that $message_body and
3242 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3245 deliver_datafile = data_fd;
3248 enable_dollar_recipients = TRUE;
3250 if (recipients_count == 0)
3251 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3255 /* Handle interactive SMTP messages */
3257 if (smtp_input && !smtp_batched_input)
3260 #ifndef DISABLE_DKIM
3261 if (!dkim_disable_verify)
3263 /* Finish verification, this will log individual signature results to
3265 dkim_exim_verify_finish();
3267 /* Check if we must run the DKIM ACL */
3268 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3270 uschar *dkim_verify_signers_expanded =
3271 expand_string(dkim_verify_signers);
3272 if (!dkim_verify_signers_expanded)
3273 log_write(0, LOG_MAIN|LOG_PANIC,
3274 "expansion of dkim_verify_signers option failed: %s",
3275 expand_string_message);
3280 const uschar *ptr = dkim_verify_signers_expanded;
3281 uschar *item = NULL;
3282 uschar *seen_items = NULL;
3283 int seen_items_size = 0;
3284 int seen_items_offset = 0;
3285 /* Default to OK when no items are present */
3287 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3289 /* Prevent running ACL for an empty item */
3290 if (!item || !*item) continue;
3292 /* Only run ACL once for each domain or identity,
3293 no matter how often it appears in the expanded list. */
3296 uschar *seen_item = NULL;
3297 const uschar *seen_items_list = seen_items;
3298 BOOL seen_this_item = FALSE;
3300 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3302 if (Ustrcmp(seen_item,item) == 0)
3304 seen_this_item = TRUE;
3311 debug_printf("acl_smtp_dkim: skipping signer %s, "
3312 "already seen\n", item);
3316 seen_items = string_append(seen_items, &seen_items_size,
3317 &seen_items_offset, 1, ":");
3320 seen_items = string_append(seen_items, &seen_items_size,
3321 &seen_items_offset, 1, item);
3322 seen_items[seen_items_offset] = '\0';
3325 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3328 dkim_exim_acl_setup(item);
3329 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3330 &user_msg, &log_msg);
3335 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3336 "skipping remaining items\n", rc, item);
3337 cancel_cutthrough_connection("dkim acl not ok");
3341 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3344 recipients_count = 0;
3345 blackholed_by = US"DKIM ACL";
3346 if (log_msg != NULL)
3347 blackhole_log_msg = string_sprintf(": %s", log_msg);
3351 Uunlink(spool_name);
3352 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3353 smtp_yield = FALSE; /* No more messages after dropped connection */
3354 smtp_reply = US""; /* Indicate reply already sent */
3355 message_id[0] = 0; /* Indicate no message accepted */
3356 goto TIDYUP; /* Skip to end of function */
3361 #endif /* DISABLE_DKIM */
3363 #ifdef WITH_CONTENT_SCAN
3364 if (recipients_count > 0 &&
3365 acl_smtp_mime != NULL &&
3366 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3368 #endif /* WITH_CONTENT_SCAN */
3370 #ifdef EXPERIMENTAL_DMARC
3371 dmarc_up = dmarc_store_data(from_header);
3372 #endif /* EXPERIMENTAL_DMARC */
3374 #ifndef DISABLE_PRDR
3375 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3379 int all_fail = FAIL;
3381 smtp_printf("353 PRDR content analysis beginning\r\n");
3382 /* Loop through recipients, responses must be in same order received */
3383 for (c = 0; recipients_count > c; c++)
3385 uschar * addr= recipients_list[c].address;
3386 uschar * msg= US"PRDR R=<%s> %s";
3389 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3390 addr, c+1, recipients_count);
3391 rc = acl_check(ACL_WHERE_PRDR, addr,
3392 acl_smtp_data_prdr, &user_msg, &log_msg);
3394 /* If any recipient rejected content, indicate it in final message */
3396 /* If all recipients rejected, indicate in final message */
3401 case OK: case DISCARD: code = US"250"; break;
3402 case DEFER: code = US"450"; break;
3403 default: code = US"550"; break;
3405 if (user_msg != NULL)
3406 smtp_user_msg(code, user_msg);
3411 case OK: case DISCARD:
3412 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3414 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3416 msg = string_sprintf(CS msg, addr, "refusal"); break;
3418 smtp_user_msg(code, msg);
3420 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3421 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3422 else log_write(0, LOG_MAIN, "%s", CS msg);
3424 if (rc != OK) { receive_remove_recipient(addr); c--; }
3426 /* Set up final message, used if data acl gives OK */
3427 smtp_reply = string_sprintf("%s id=%s message %s",
3428 all_fail == FAIL ? US"550" : US"250",
3431 ? US"rejected for all recipients"
3434 : US"accepted for some recipients");
3435 if (recipients_count == 0)
3437 message_id[0] = 0; /* Indicate no message accepted */
3442 prdr_requested = FALSE;
3443 #endif /* !DISABLE_PRDR */
3445 /* Check the recipients count again, as the MIME ACL might have changed
3448 if (acl_smtp_data != NULL && recipients_count > 0)
3450 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3451 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3454 recipients_count = 0;
3455 blackholed_by = US"DATA ACL";
3456 if (log_msg != NULL)
3457 blackhole_log_msg = string_sprintf(": %s", log_msg);
3458 cancel_cutthrough_connection("data acl discard");
3462 Uunlink(spool_name);
3463 cancel_cutthrough_connection("data acl not ok");
3464 #ifdef WITH_CONTENT_SCAN
3467 #ifdef EXPERIMENTAL_DCC
3470 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3471 smtp_yield = FALSE; /* No more messages after dropped connection */
3472 smtp_reply = US""; /* Indicate reply already sent */
3473 message_id[0] = 0; /* Indicate no message accepted */
3474 goto TIDYUP; /* Skip to end of function */
3479 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3480 we cannot take different actions for permanent and temporary rejections. */
3485 #ifdef WITH_CONTENT_SCAN
3486 if (acl_not_smtp_mime != NULL &&
3487 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3490 #endif /* WITH_CONTENT_SCAN */
3492 if (acl_not_smtp != NULL)
3494 uschar *user_msg, *log_msg;
3495 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3498 recipients_count = 0;
3499 blackholed_by = US"non-SMTP ACL";
3500 if (log_msg != NULL)
3501 blackhole_log_msg = string_sprintf(": %s", log_msg);
3505 Uunlink(spool_name);
3506 #ifdef WITH_CONTENT_SCAN
3509 #ifdef EXPERIMENTAL_DCC
3512 /* The ACL can specify where rejections are to be logged, possibly
3513 nowhere. The default is main and reject logs. */
3515 if (log_reject_target != 0)
3516 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3517 sender_address, log_msg);
3519 if (user_msg == NULL) user_msg = US"local configuration problem";
3520 if (smtp_batched_input)
3522 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3523 /* Does not return */
3527 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3528 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3529 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3531 /* Does not return */
3534 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3538 /* The applicable ACLs have been run */
3540 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3541 if (queue_only_policy) queued_by = US"ACL";
3544 #ifdef WITH_CONTENT_SCAN
3548 #ifdef EXPERIMENTAL_DCC
3553 /* The final check on the message is to run the scan_local() function. The
3554 version supplied with Exim always accepts, but this is a hook for sysadmins to
3555 supply their own checking code. The local_scan() function is run even when all
3556 the recipients have been discarded. */
3558 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3560 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3561 deleted, and the incident gets logged. */
3563 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3564 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3565 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3566 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3568 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3569 local_scan_timeout);
3570 local_scan_data = NULL;
3572 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3573 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3574 rc = local_scan(data_fd, &local_scan_data);
3576 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3578 enable_dollar_recipients = FALSE;
3580 store_pool = POOL_MAIN; /* In case changed */
3581 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3584 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3585 os_non_restarting_signal(SIGFPE, SIG_DFL);
3586 os_non_restarting_signal(SIGILL, SIG_DFL);
3587 os_non_restarting_signal(SIGBUS, SIG_DFL);
3589 /* The length check is paranoia against some runaway code, and also because
3590 (for a success return) lines in the spool file are read into big_buffer. */
3592 if (local_scan_data != NULL)
3594 int len = Ustrlen(local_scan_data);
3595 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3596 local_scan_data = string_copyn(local_scan_data, len);
3599 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3601 if (!deliver_freeze) /* ACL might have already frozen */
3603 deliver_freeze = TRUE;
3604 deliver_frozen_at = time(NULL);
3605 frozen_by = US"local_scan()";
3607 rc = LOCAL_SCAN_ACCEPT;
3609 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3611 if (!queue_only_policy) /* ACL might have already queued */
3613 queue_only_policy = TRUE;
3614 queued_by = US"local_scan()";
3616 rc = LOCAL_SCAN_ACCEPT;
3619 /* Message accepted: remove newlines in local_scan_data because otherwise
3620 the spool file gets corrupted. Ensure that all recipients are qualified. */
3622 if (rc == LOCAL_SCAN_ACCEPT)
3624 if (local_scan_data != NULL)
3627 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3629 for (i = 0; i < recipients_count; i++)
3631 recipient_item *r = recipients_list + i;
3632 r->address = rewrite_address_qualify(r->address, TRUE);
3633 if (r->errors_to != NULL)
3634 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3636 if (recipients_count == 0 && blackholed_by == NULL)
3637 blackholed_by = US"local_scan";
3640 /* Message rejected: newlines permitted in local_scan_data to generate
3641 multiline SMTP responses. */
3645 uschar *istemp = US"";
3651 errmsg = local_scan_data;
3653 Uunlink(spool_name); /* Cancel this message */
3657 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3658 "rejection given", rc);
3661 case LOCAL_SCAN_REJECT_NOLOGHDR:
3662 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3665 case LOCAL_SCAN_REJECT:
3666 smtp_code = US"550";
3667 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3670 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3671 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3674 case LOCAL_SCAN_TEMPREJECT:
3676 smtp_code = US"451";
3677 if (errmsg == NULL) errmsg = US"Temporary local problem";
3678 istemp = US"temporarily ";
3682 s = string_append(s, &size, &sptr, 2, US"F=",
3683 (sender_address[0] == 0)? US"<>" : sender_address);
3684 s = add_host_info_for_log(s, &size, &sptr);
3687 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3688 s, istemp, string_printing(errmsg));
3692 if (!smtp_batched_input)
3694 smtp_respond(smtp_code, 3, TRUE, errmsg);
3695 message_id[0] = 0; /* Indicate no message accepted */
3696 smtp_reply = US""; /* Indicate reply already sent */
3697 goto TIDYUP; /* Skip to end of function */
3701 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3702 /* Does not return */
3707 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3708 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3709 US"message rejected by local scan code: ", error_rc, data_file,
3711 /* Does not return */
3715 /* Reset signal handlers to ignore signals that previously would have caused
3716 the message to be abandoned. */
3718 signal(SIGTERM, SIG_IGN);
3719 signal(SIGINT, SIG_IGN);
3722 /* Ensure the first time flag is set in the newly-received message. */
3724 deliver_firsttime = TRUE;
3726 #ifdef EXPERIMENTAL_BRIGHTMAIL
3728 { /* rewind data file */
3729 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3730 bmi_verdicts = bmi_process_message(header_list, data_fd);
3734 /* Update the timstamp in our Received: header to account for any time taken by
3735 an ACL or by local_scan(). The new time is the time that all reception
3736 processing is complete. */
3738 timestamp = expand_string(US"${tod_full}");
3739 tslen = Ustrlen(timestamp);
3741 memcpy(received_header->text + received_header->slen - tslen - 1,
3744 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3748 deliver_freeze = FALSE;
3749 queue_only_policy = FALSE;
3752 /* Keep the data file open until we have written the header file, in order to
3753 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3754 don't write the header file, and we unlink the data file. If writing the header
3755 file fails, we have failed to accept this message. */
3757 if (host_checking || blackholed_by != NULL)
3760 Uunlink(spool_name);
3761 msg_size = 0; /* Compute size for log line */
3762 for (h = header_list; h != NULL; h = h->next)
3763 if (h->type != '*') msg_size += h->slen;
3766 /* Write the -H file */
3769 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3771 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3772 Uunlink(spool_name); /* Lose the data file */
3776 smtp_reply = US"451 Error in writing spool file";
3777 message_id[0] = 0; /* Indicate no message accepted */
3782 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3783 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3785 /* Does not return */
3790 /* The message has now been successfully received. */
3792 receive_messagecount++;
3794 /* In SMTP sessions we may receive several in one connection. After each one,
3795 we wait for the clock to tick at the level of message-id granularity. This is
3796 so that the combination of time+pid is unique, even on systems where the pid
3797 can be re-used within our time interval. We can't shorten the interval without
3798 re-designing the message-id. See comments above where the message id is
3799 created. This is Something For The Future. */
3801 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3802 exim_wait_tick(&message_id_tv, id_resolution);
3804 /* Add data size to written header size. We do not count the initial file name
3805 that is in the file, but we do add one extra for the notional blank line that
3806 precedes the data. This total differs from message_size in that it include the
3807 added Received: header and any other headers that got created locally. */
3810 fstat(data_fd, &statbuf);
3812 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3814 /* Generate a "message received" log entry. We do this by building up a dynamic
3815 string as required. Since we commonly want to add two items at a time, use a
3816 macro to simplify the coding. We log the arrival of a new message while the
3817 file is still locked, just in case the machine is *really* fast, and delivers
3818 it first! Include any message id that is in the message - since the syntax of a
3819 message id is actually an addr-spec, we can use the parse routine to canonicize
3824 s = store_get(size);
3826 s = string_append(s, &size, &sptr, 2,
3827 fake_response == FAIL ? US"(= " : US"<= ",
3828 sender_address[0] == 0 ? US"<>" : sender_address);
3829 if (message_reference)
3830 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3832 s = add_host_info_for_log(s, &size, &sptr);
3835 if (LOGGING(tls_cipher) && tls_in.cipher)
3836 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3837 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3838 s = string_append(s, &size, &sptr, 2, US" CV=",
3839 tls_in.certificate_verified ? "yes":"no");
3840 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3841 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3842 string_printing(tls_in.peerdn), US"\"");
3843 if (LOGGING(tls_sni) && tls_in.sni)
3844 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3845 string_printing(tls_in.sni), US"\"");
3848 if (sender_host_authenticated)
3850 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3851 if (authenticated_id)
3853 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3854 if (LOGGING(smtp_mailauth) && authenticated_sender)
3855 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3859 #ifndef DISABLE_PRDR
3861 s = string_catn(s, &size, &sptr, US" PRDR", 5);
3864 #ifdef SUPPORT_PROXY
3865 if (proxy_session && LOGGING(proxy))
3866 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3869 if (chunking_state > CHUNKING_OFFERED)
3870 s = string_catn(s, &size, &sptr, US" K", 2);
3872 sprintf(CS big_buffer, "%d", msg_size);
3873 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3875 /* log 8BITMIME mode announced in MAIL_FROM
3879 if (LOGGING(8bitmime))
3881 sprintf(CS big_buffer, "%d", body_8bitmime);
3882 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3886 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
3888 /* If an addr-spec in a message-id contains a quoted string, it can contain
3889 any characters except " \ and CR and so in particular it can contain NL!
3890 Therefore, make sure we use a printing-characters only version for the log.
3891 Also, allow for domain literals in the message id. */
3896 BOOL save_allow_domain_literals = allow_domain_literals;
3897 allow_domain_literals = TRUE;
3898 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3899 &errmsg, &start, &end, &domain, FALSE);
3900 allow_domain_literals = save_allow_domain_literals;
3902 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3905 /* If subject logging is turned on, create suitable printing-character
3906 text. By expanding $h_subject: we make use of the MIME decoding. */
3908 if (LOGGING(subject) && subject_header != NULL)
3911 uschar *p = big_buffer;
3912 uschar *ss = expand_string(US"$h_subject:");
3914 /* Backslash-quote any double quotes or backslashes so as to make a
3915 a C-like string, and turn any non-printers into escape sequences. */
3918 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3920 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3925 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3928 /* Terminate the string: string_cat() and string_append() leave room, but do
3929 not put the zero in. */
3933 /* Create a message log file if message logs are being used and this message is
3934 not blackholed. Write the reception stuff to it. We used to leave message log
3935 creation until the first delivery, but this has proved confusing for some
3938 if (message_logs && blackholed_by == NULL)
3942 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
3944 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
3948 (void)directory_make(spool_directory,
3949 spool_sname(US"msglog", message_subdir),
3950 MSGLOG_DIRECTORY_MODE, TRUE);
3951 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3956 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3957 spool_name, strerror(errno));
3962 FILE *message_log = fdopen(fd, "a");
3963 if (message_log == NULL)
3965 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3966 spool_name, strerror(errno));
3971 uschar *now = tod_stamp(tod_log);
3972 fprintf(message_log, "%s Received from %s\n", now, s+3);
3973 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3975 if (queue_only_policy) fprintf(message_log,
3976 "%s no immediate delivery: queued%s%s by %s\n", now,
3977 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
3979 (void)fclose(message_log);
3984 /* Everything has now been done for a successful message except logging its
3985 arrival, and outputting an SMTP response. While writing to the log, set a flag
3986 to cause a call to receive_bomb_out() if the log cannot be opened. */
3988 receive_call_bombout = TRUE;
3990 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3991 connection has gone away. This can only be done if there is no unconsumed input
3992 waiting in the local input buffer. We can test for this by calling
3993 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3994 input to be sent following the final dot, so the presence of following input is
3997 If the connection is still present, but there is no unread input for the
3998 socket, the result of a select() call will be zero. If, however, the connection
3999 has gone away, or if there is pending input, the result of select() will be
4000 non-zero. The two cases can be distinguished by trying to read the next input
4001 character. If we succeed, we can unread it so that it remains in the local
4002 buffer for handling later. If not, the connection has been lost.
4004 Of course, since TCP/IP is asynchronous, there is always a chance that the
4005 connection will vanish between the time of this test and the sending of the
4006 response, but the chance of this happening should be small. */
4008 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4009 !receive_smtp_buffered())
4012 fd_set select_check;
4013 FD_ZERO(&select_check);
4014 FD_SET(fileno(smtp_in), &select_check);
4018 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4020 int c = (receive_getc)();
4021 if (c != EOF) (receive_ungetc)(c); else
4023 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4024 smtp_reply = US""; /* No attempt to send a response */
4025 smtp_yield = FALSE; /* Nothing more on this connection */
4027 /* Re-use the log line workspace */
4030 s = string_cat(s, &size, &sptr, US"SMTP connection lost after final dot");
4031 s = add_host_info_for_log(s, &size, &sptr);
4033 log_write(0, LOG_MAIN, "%s", s);
4035 /* Delete the files for this aborted message. */
4037 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4038 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4039 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4046 /* The connection has not gone away; we really are going to take responsibility
4047 for this message. */
4049 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4052 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4053 the sender's dot (below).
4054 If rejected: copy response to sender, wipe the spooled files, log approriately.
4055 If temp-reject: accept to sender, keep the spooled files.
4057 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4059 XXX We do not handle queue-only, freezing, or blackholes.
4061 if(cutthrough.fd >= 0)
4063 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the message */
4064 /* Logging was done in finaldot() */
4067 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4068 cutthrough_done = ACCEPTED;
4069 break; /* message_id needed for SMTP accept below */
4071 default: /* Unknown response, or error. Treat as temp-reject. */
4072 case '4': /* Temp-reject. Keep spoolfiles and accept. */
4073 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4074 break; /* message_id needed for SMTP accept below */
4076 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4077 smtp_reply= msg; /* Pass on the exact error */
4078 cutthrough_done = PERM_REJ;
4083 #ifndef DISABLE_PRDR
4084 if(!smtp_reply || prdr_requested)
4089 log_write(0, LOG_MAIN |
4090 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4091 (LOGGING(received_sender)? LOG_SENDER : 0),
4094 /* Log any control actions taken by an ACL or local_scan(). */
4096 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4097 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4098 "no immediate delivery: queued%s%s by %s",
4099 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4102 receive_call_bombout = FALSE;
4104 store_reset(s); /* The store for the main log message can be reused */
4106 /* If the message is frozen, and freeze_tell is set, do the telling. */
4108 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4110 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4111 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4112 message_id, frozen_by, sender_address);
4116 /* Either a message has been successfully received and written to the two spool
4117 files, or an error in writing the spool has occurred for an SMTP message, or
4118 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4119 we will have already given up because there's no point in carrying on!) In
4120 either event, we must now close (and thereby unlock) the data file. In the
4121 successful case, this leaves the message on the spool, ready for delivery. In
4122 the error case, the spool file will be deleted. Then tidy up store, interact
4123 with an SMTP call if necessary, and return.
4125 A fflush() was done earlier in the expectation that any write errors on the
4126 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4127 possible for fclose() to fail - but what to do? What has happened to the lock
4132 process_info[process_info_len] = 0; /* Remove message id */
4133 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4135 /* Now reset signal handlers to their defaults */
4137 signal(SIGTERM, SIG_DFL);
4138 signal(SIGINT, SIG_DFL);
4140 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4141 value, which defaults TRUE - meaning there may be more incoming messages from
4142 this connection. For non-SMTP callers (where there is only ever one message),
4143 the default is FALSE. */
4149 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4150 is set to the response that should be sent. When it is NULL, we generate
4151 default responses. After an ACL error or local_scan() error, the response has
4152 already been sent, and smtp_reply is an empty string to indicate this. */
4154 if (!smtp_batched_input)
4158 if (fake_response != OK)
4159 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4160 3, TRUE, fake_response_text);
4162 /* An OK response is required; use "message" text if present. */
4166 uschar *code = US"250";
4168 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4169 smtp_respond(code, len, TRUE, user_msg);
4172 /* Default OK response */
4174 else if (chunking_state > CHUNKING_OFFERED)
4176 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4177 chunking_datasize, message_size+message_linecount, message_id);
4178 chunking_state = CHUNKING_OFFERED;
4181 smtp_printf("250 OK id=%s\r\n", message_id);
4185 "\n**** SMTP testing: that is not a real message id!\n\n");
4188 /* smtp_reply is set non-empty */
4190 else if (smtp_reply[0] != 0)
4192 if (fake_response != OK && (smtp_reply[0] == '2'))
4193 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4194 fake_response_text);
4196 smtp_printf("%.1024s\r\n", smtp_reply);
4199 switch (cutthrough_done)
4201 case ACCEPTED: log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4203 { /* Delete spool files */
4204 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4205 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4206 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4208 case TMP_REJ: message_id[0] = 0; /* Prevent a delivery from starting */
4211 cutthrough.delivery = FALSE;
4214 /* For batched SMTP, generate an error message on failure, and do
4215 nothing on success. The function moan_smtp_batch() does not return -
4216 it exits from the program with a non-zero return code. */
4218 else if (smtp_reply)
4219 moan_smtp_batch(NULL, "%s", smtp_reply);
4223 /* If blackholing, we can immediately log this message's sad fate. The data
4224 file has already been unlinked, and the header file was never written to disk.
4225 We must now indicate that nothing was received, to prevent a delivery from
4230 const uschar *detail = local_scan_data
4231 ? string_printing(local_scan_data)
4232 : string_sprintf("(%s discarded recipients)", blackholed_by);
4233 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4234 log_write(0, LOG_MAIN, "Completed");
4238 /* Reset headers so that logging of rejects for a subsequent message doesn't
4239 include them. It is also important to set header_last = NULL before exiting
4240 from this function, as this prevents certain rewrites that might happen during
4241 subsequent verifying (of another incoming message) from trying to add headers
4242 when they shouldn't. */
4244 header_list = header_last = NULL;
4246 return yield; /* TRUE if more messages (SMTP only) */
4249 /* End of receive.c */