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)
780 register int linelength = 0;
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 /*************************************************
894 * Swallow SMTP message *
895 *************************************************/
897 /* This function is called when there has been some kind of error while reading
898 an SMTP message, and the remaining data may need to be swallowed. It is global
899 because it is called from smtp_closedown() to shut down an incoming call
902 Argument: a FILE from which to read the message
907 receive_swallow_smtp(void)
909 if (message_ended >= END_NOTENDED)
910 message_ended = read_message_data_smtp(NULL);
915 /*************************************************
916 * Handle lost SMTP connection *
917 *************************************************/
919 /* This function logs connection loss incidents and generates an appropriate
922 Argument: additional data for the message
923 Returns: the SMTP response
927 handle_lost_connection(uschar *s)
929 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
930 "%s lost while reading message data%s", smtp_get_connection_info(), s);
931 return US"421 Lost incoming connection";
937 /*************************************************
938 * Handle a non-smtp reception error *
939 *************************************************/
941 /* This function is called for various errors during the reception of non-SMTP
942 messages. It either sends a message to the sender of the problem message, or it
943 writes to the standard error stream.
946 errcode code for moan_to_sender(), identifying the error
947 text1 first message text, passed to moan_to_sender()
948 text2 second message text, used only for stderrr
949 error_rc code to pass to exim_exit if no problem
950 f FILE containing body of message (may be stdin)
951 hptr pointer to instore headers or NULL
953 Returns: calls exim_exit(), which does not return
957 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
958 FILE *f, header_line *hptr)
960 if (error_handling == ERRORS_SENDER)
964 eblock.text1 = text1;
966 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
967 error_rc = EXIT_FAILURE;
970 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
977 /*************************************************
978 * Add header lines set up by ACL *
979 *************************************************/
981 /* This function is called to add the header lines that were set up by
982 statements in an ACL to the list of headers in memory. It is done in two stages
983 like this, because when the ACL for RCPT is running, the other headers have not
984 yet been received. This function is called twice; once just before running the
985 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
986 are visible to the DATA ACL.
988 Originally these header lines were added at the end. Now there is support for
989 three different places: top, bottom, and after the Received: header(s). There
990 will always be at least one Received: header, even if it is marked deleted, and
991 even if something else has been put in front of it.
994 acl_name text to identify which ACL
1000 add_acl_headers(int where, uschar *acl_name)
1002 header_line *h, *next;
1003 header_line *last_received = NULL;
1007 case ACL_WHERE_DKIM:
1008 case ACL_WHERE_MIME:
1009 case ACL_WHERE_DATA:
1010 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1012 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1013 " will not take effect on cutthrough deliveries");
1018 if (acl_removed_headers != NULL)
1020 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1022 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1024 const uschar * list = acl_removed_headers;
1025 int sep = ':'; /* This is specified as a colon-separated list */
1029 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1030 if (header_testname(h, s, Ustrlen(s), FALSE))
1032 h->type = htype_old;
1033 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1036 acl_removed_headers = NULL;
1037 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1040 if (acl_added_headers == NULL) return;
1041 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1043 for (h = acl_added_headers; h != NULL; h = next)
1050 h->next = header_list;
1052 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1056 if (last_received == NULL)
1058 last_received = header_list;
1059 while (!header_testname(last_received, US"Received", 8, FALSE))
1060 last_received = last_received->next;
1061 while (last_received->next != NULL &&
1062 header_testname(last_received->next, US"Received", 8, FALSE))
1063 last_received = last_received->next;
1065 h->next = last_received->next;
1066 last_received->next = h;
1067 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1071 /* add header before any header which is NOT Received: or Resent- */
1072 last_received = header_list;
1073 while ( (last_received->next != NULL) &&
1074 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1075 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1076 last_received = last_received->next;
1077 /* last_received now points to the last Received: or Resent-* header
1078 in an uninterrupted chain of those header types (seen from the beginning
1079 of all headers. Our current header must follow it. */
1080 h->next = last_received->next;
1081 last_received->next = h;
1082 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1087 header_last->next = h;
1091 if (h->next == NULL) header_last = h;
1093 /* Check for one of the known header types (From:, To:, etc.) though in
1094 practice most added headers are going to be "other". Lower case
1095 identification letters are never stored with the header; they are used
1096 for existence tests when messages are received. So discard any lower case
1099 h->type = header_checkname(h, FALSE);
1100 if (h->type >= 'a') h->type = htype_other;
1102 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1105 acl_added_headers = NULL;
1106 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1111 /*************************************************
1112 * Add host information for log line *
1113 *************************************************/
1115 /* Called for acceptance and rejecting log lines. This adds information about
1116 the calling host to a string that is being built dynamically.
1119 s the dynamic string
1120 sizeptr points to the size variable
1121 ptrptr points to the pointer variable
1123 Returns: the extended string
1127 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1129 if (sender_fullhost)
1131 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1132 s = string_cat(s, sizeptr, ptrptr, US" DS");
1133 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1134 if (LOGGING(incoming_interface) && interface_address != NULL)
1136 s = string_cat(s, sizeptr, ptrptr,
1137 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1140 if (sender_ident != NULL)
1141 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1142 if (received_protocol != NULL)
1143 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1149 #ifdef WITH_CONTENT_SCAN
1151 /*************************************************
1152 * Run the MIME ACL on a message *
1153 *************************************************/
1155 /* This code is in a subroutine so that it can be used for both SMTP
1156 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1159 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1160 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1161 smtp_reply_ptr Where SMTP reply is being built
1162 blackholed_by_ptr Where "blackholed by" message is being built
1164 Returns: TRUE to carry on; FALSE to abandon the message
1168 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1169 uschar **blackholed_by_ptr)
1172 uschar rfc822_file_path[2048];
1173 unsigned long mbox_size;
1174 header_line *my_headerlist;
1175 uschar *user_msg, *log_msg;
1176 int mime_part_count_buffer = -1;
1179 memset(CS rfc822_file_path,0,2048);
1181 /* check if it is a MIME message */
1182 my_headerlist = header_list;
1183 while (my_headerlist != NULL)
1185 /* skip deleted headers */
1186 if (my_headerlist->type == '*')
1188 my_headerlist = my_headerlist->next;
1191 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1193 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1196 my_headerlist = my_headerlist->next;
1199 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1203 /* make sure the eml mbox file is spooled up */
1204 mbox_file = spool_mbox(&mbox_size, NULL);
1205 if (mbox_file == NULL) {
1206 /* error while spooling */
1207 log_write(0, LOG_MAIN|LOG_PANIC,
1208 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1209 Uunlink(spool_name);
1211 #ifdef EXPERIMENTAL_DCC
1214 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1215 message_id[0] = 0; /* Indicate no message accepted */
1216 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1217 return FALSE; /* Indicate skip to end of receive function */
1223 mime_part_count = -1;
1224 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1225 (void)fclose(mbox_file);
1227 if (Ustrlen(rfc822_file_path) > 0)
1229 mime_part_count = mime_part_count_buffer;
1231 if (unlink(CS rfc822_file_path) == -1)
1233 log_write(0, LOG_PANIC,
1234 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1239 /* check if we must check any message/rfc822 attachments */
1242 uschar temp_path[1024];
1243 struct dirent * entry;
1246 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1247 spool_directory, message_id);
1249 tempdir = opendir(CS temp_path);
1252 if (!(entry = readdir(tempdir)))
1254 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1256 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1257 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1258 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1267 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1269 /* set RFC822 expansion variable */
1271 mime_part_count_buffer = mime_part_count;
1272 goto MIME_ACL_CHECK;
1274 log_write(0, LOG_PANIC,
1275 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1276 unlink(CS rfc822_file_path);
1281 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1284 recipients_count = 0;
1285 *blackholed_by_ptr = US"MIME ACL";
1289 Uunlink(spool_name);
1291 #ifdef EXPERIMENTAL_DCC
1295 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1297 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1298 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1300 message_id[0] = 0; /* Indicate no message accepted */
1301 return FALSE; /* Cause skip to end of receive function */
1307 #endif /* WITH_CONTENT_SCAN */
1312 received_header_gen(void)
1316 header_line *received_header= header_list;
1318 timestamp = expand_string(US"${tod_full}");
1319 if (recipients_count == 1) received_for = recipients_list[0].address;
1320 received = expand_string(received_header_text);
1321 received_for = NULL;
1325 if(spool_name[0] != 0)
1326 Uunlink(spool_name); /* Lose the data file */
1327 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1328 "(received_header_text) failed: %s", string_printing(received_header_text),
1329 expand_string_message);
1332 /* The first element on the header chain is reserved for the Received header,
1333 so all we have to do is fill in the text pointer, and set the type. However, if
1334 the result of the expansion is an empty string, we leave the header marked as
1335 "old" so as to refrain from adding a Received header. */
1337 if (received[0] == 0)
1339 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1340 received_header->type = htype_old;
1344 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1345 received_header->type = htype_received;
1348 received_header->slen = Ustrlen(received_header->text);
1350 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1351 received_header->type, received_header->text);
1356 /*************************************************
1358 *************************************************/
1360 /* Receive a message on the given input, and put it into a pair of spool files.
1361 Either a non-null list of recipients, or the extract flag will be true, or
1362 both. The flag sender_local is true for locally generated messages. The flag
1363 submission_mode is true if an ACL has obeyed "control = submission". The flag
1364 suppress_local_fixups is true if an ACL has obeyed "control =
1365 suppress_local_fixups" or -G was passed on the command-line.
1366 The flag smtp_input is true if the message is to be
1367 handled using SMTP conventions about termination and lines starting with dots.
1368 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1370 If a message was successfully read, message_id[0] will be non-zero.
1372 The general actions of this function are:
1374 . Read the headers of the message (if any) into a chain of store
1377 . If there is a "sender:" header and the message is locally originated,
1378 throw it away, unless the caller is trusted, or unless
1379 active_local_sender_retain is set - which can only happen if
1380 active_local_from_check is false.
1382 . If recipients are to be extracted from the message, build the
1383 recipients list from the headers, removing any that were on the
1384 original recipients list (unless extract_addresses_remove_arguments is
1385 false), and at the same time, remove any bcc header that may be present.
1387 . Get the spool file for the data, sort out its unique name, open
1388 and lock it (but don't give it the name yet).
1390 . Generate a "Message-Id" header if the message doesn't have one, for
1391 locally-originated messages.
1393 . Generate a "Received" header.
1395 . Ensure the recipients list is fully qualified and rewritten if necessary.
1397 . If there are any rewriting rules, apply them to the sender address
1398 and also to the headers.
1400 . If there is no from: header, generate one, for locally-generated messages
1401 and messages in "submission mode" only.
1403 . If the sender is local, check that from: is correct, and if not, generate
1404 a Sender: header, unless message comes from a trusted caller, or this
1405 feature is disabled by active_local_from_check being false.
1407 . If there is no "date" header, generate one, for locally-originated
1408 or submission mode messages only.
1410 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1411 dot_ends mode, to the data file. Leave it open, to hold the lock.
1413 . Write the envelope and the headers to a new file.
1415 . Set the name for the header file; close it.
1417 . Set the name for the data file; close it.
1419 Because this function can potentially be called many times in a single
1420 SMTP connection, all store should be got by store_get(), so that it will be
1421 automatically retrieved after the message is accepted.
1423 FUDGE: It seems that sites on the net send out messages with just LF
1424 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1425 we make the CRs optional in all cases.
1427 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1428 new regime is now in place in which bare CRs in header lines are turned into LF
1429 followed by a space, so as not to terminate the header line.
1431 February 2004: A bare LF in a header line in a message whose first line was
1432 terminated by CRLF is treated in the same way as a bare CR.
1435 extract_recip TRUE if recipients are to be extracted from the message's
1438 Returns: TRUE there are more messages to be read (SMTP input)
1439 FALSE there are no more messages to be read (non-SMTP input
1440 or SMTP connection collapsed, or other failure)
1442 When reading a message for filter testing, the returned value indicates
1443 whether the headers (which is all that is read) were terminated by '.' or
1447 receive_msg(BOOL extract_recip)
1452 int process_info_len = Ustrlen(process_info);
1453 int error_rc = (error_handling == ERRORS_SENDER)?
1454 errors_sender_rc : EXIT_FAILURE;
1455 int header_size = 256;
1456 int start, end, domain, size, sptr;
1459 int prevlines_length = 0;
1461 register int ptr = 0;
1463 BOOL contains_resent_headers = FALSE;
1464 BOOL extracted_ignored = FALSE;
1465 BOOL first_line_ended_crlf = TRUE_UNSET;
1466 BOOL smtp_yield = TRUE;
1469 BOOL resents_exist = FALSE;
1470 uschar *resent_prefix = US"";
1471 uschar *blackholed_by = NULL;
1472 uschar *blackhole_log_msg = US"";
1473 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1476 error_block *bad_addresses = NULL;
1478 uschar *frozen_by = NULL;
1479 uschar *queued_by = NULL;
1482 struct stat statbuf;
1484 /* Final message to give to SMTP caller, and messages from ACLs */
1486 uschar *smtp_reply = NULL;
1487 uschar *user_msg, *log_msg;
1489 /* Working header pointers */
1491 header_line *h, *next;
1493 /* Flags for noting the existence of certain headers (only one left) */
1495 BOOL date_header_exists = FALSE;
1497 /* Pointers to receive the addresses of headers whose contents we need. */
1499 header_line *from_header = NULL;
1500 header_line *subject_header = NULL;
1501 header_line *msgid_header = NULL;
1502 header_line *received_header;
1504 #ifdef EXPERIMENTAL_DMARC
1506 #endif /* EXPERIMENTAL_DMARC */
1508 /* Variables for use when building the Received: header. */
1513 /* Release any open files that might have been cached while preparing to
1514 accept the message - e.g. by verifying addresses - because reading a message
1515 might take a fair bit of real time. */
1519 /* Extracting the recipient list from an input file is incompatible with
1520 cutthrough delivery with the no-spool option. It shouldn't be possible
1521 to set up the combination, but just in case kill any ongoing connection. */
1522 if (extract_recip || !smtp_input)
1523 cancel_cutthrough_connection("not smtp input");
1525 /* Initialize the chain of headers by setting up a place-holder for Received:
1526 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1527 pointing to the end of the chain to make adding headers simple. */
1529 received_header = header_list = header_last = store_get(sizeof(header_line));
1530 header_list->next = NULL;
1531 header_list->type = htype_old;
1532 header_list->text = NULL;
1533 header_list->slen = 0;
1535 /* Control block for the next header to be read. */
1537 next = store_get(sizeof(header_line));
1538 next->text = store_get(header_size);
1540 /* Initialize message id to be null (indicating no message read), and the
1541 header names list to be the normal list. Indicate there is no data file open
1542 yet, initialize the size and warning count, and deal with no size limit. */
1550 received_count = 1; /* For the one we will add */
1552 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1554 /* While reading the message, the following counts are computed. */
1556 message_linecount = body_linecount = body_zerocount =
1557 max_received_linelength = 0;
1559 #ifndef DISABLE_DKIM
1560 /* Call into DKIM to set up the context. */
1561 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1564 #ifdef EXPERIMENTAL_DMARC
1565 /* initialize libopendmarc */
1566 dmarc_up = dmarc_init();
1569 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1570 ids, and fractions of a second are required. See the comments that precede the
1571 message id creation below. */
1573 (void)gettimeofday(&message_id_tv, NULL);
1575 /* For other uses of the received time we can operate with granularity of one
1576 second, and for that we use the global variable received_time. This is for
1577 things like ultimate message timeouts. */
1579 received_time = message_id_tv.tv_sec;
1581 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1582 happen in the smtp_getc() function when it refills its buffer. */
1584 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1586 /* If not SMTP input, timeout happens only if configured, and we just set a
1587 single timeout for the whole message. */
1589 else if (receive_timeout > 0)
1591 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1592 alarm(receive_timeout);
1595 /* SIGTERM and SIGINT are caught always. */
1597 signal(SIGTERM, data_sigterm_sigint_handler);
1598 signal(SIGINT, data_sigterm_sigint_handler);
1600 /* Header lines in messages are not supposed to be very long, though when
1601 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1602 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1603 storing the header, and extend this as necessary using string_cat().
1605 To cope with total lunacies, impose an upper limit on the length of the header
1606 section of the message, as otherwise the store will fill up. We must also cope
1607 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1608 Folded header lines are joined into one string, leaving the '\n' characters
1609 inside them, so that writing them out reproduces the input.
1611 Loop for each character of each header; the next structure for chaining the
1612 header is set up already, with ptr the offset of the next character in
1617 int ch = (receive_getc)();
1619 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1620 SMTP must have a correct "." terminator. */
1622 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1624 smtp_reply = handle_lost_connection(US" (header)");
1626 goto TIDYUP; /* Skip to end of function */
1629 /* See if we are at the current header's size limit - there must be at least
1630 four bytes left. This allows for the new character plus a zero, plus two for
1631 extra insertions when we are playing games with dots and carriage returns. If
1632 we are at the limit, extend the text buffer. This could have been done
1633 automatically using string_cat() but because this is a tightish loop storing
1634 only one character at a time, we choose to do it inline. Normally
1635 store_extend() will be able to extend the block; only at the end of a big
1636 store block will a copy be needed. To handle the case of very long headers
1637 (and sometimes lunatic messages can have ones that are 100s of K long) we
1638 call store_release() for strings that have been copied - if the string is at
1639 the start of a block (and therefore the only thing in it, because we aren't
1640 doing any other gets), the block gets freed. We can only do this because we
1641 know there are no other calls to store_get() going on. */
1643 if (ptr >= header_size - 4)
1645 int oldsize = header_size;
1646 /* header_size += 256; */
1648 if (!store_extend(next->text, oldsize, header_size))
1650 uschar *newtext = store_get(header_size);
1651 memcpy(newtext, next->text, ptr);
1652 store_release(next->text);
1653 next->text = newtext;
1657 /* Cope with receiving a binary zero. There is dispute about whether
1658 these should be allowed in RFC 822 messages. The middle view is that they
1659 should not be allowed in headers, at least. Exim takes this attitude at
1660 the moment. We can't just stomp on them here, because we don't know that
1661 this line is a header yet. Set a flag to cause scanning later. */
1663 if (ch == 0) had_zero++;
1665 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1666 those from data files use just LF. Treat LF in local SMTP input as a
1667 terminator too. Treat EOF as a line terminator always. */
1669 if (ch == EOF) goto EOL;
1671 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1672 other MTAs accept this. We are therefore forced into this "liberalisation"
1673 too, so we accept LF as a line terminator whatever the source of the message.
1674 However, if the first line of the message ended with a CRLF, we treat a bare
1675 LF specially by inserting a white space after it to ensure that the header
1676 line is not terminated. */
1680 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1681 else if (first_line_ended_crlf) receive_ungetc(' ');
1685 /* This is not the end of the line. If this is SMTP input and this is
1686 the first character in the line and it is a "." character, ignore it.
1687 This implements the dot-doubling rule, though header lines starting with
1688 dots aren't exactly common. They are legal in RFC 822, though. If the
1689 following is CRLF or LF, this is the line that that terminates the
1690 entire message. We set message_ended to indicate this has happened (to
1691 prevent further reading), and break out of the loop, having freed the
1692 empty header, and set next = NULL to indicate no data line. */
1694 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1696 ch = (receive_getc)();
1699 ch = (receive_getc)();
1703 ch = '\r'; /* Revert to CR */
1708 message_ended = END_DOT;
1711 break; /* End character-reading loop */
1714 /* For non-SMTP input, the dot at the start of the line was really a data
1715 character. What is now in ch is the following character. We guaranteed
1716 enough space for this above. */
1720 next->text[ptr++] = '.';
1725 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1726 remember this case if this is the first line ending. */
1730 ch = (receive_getc)();
1733 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1737 /* Otherwise, put back the character after CR, and turn the bare CR
1740 ch = (receive_ungetc)(ch);
1741 next->text[ptr++] = '\n';
1746 /* We have a data character for the header line. */
1748 next->text[ptr++] = ch; /* Add to buffer */
1749 message_size++; /* Total message size so far */
1751 /* Handle failure due to a humungously long header section. The >= allows
1752 for the terminating \n. Add what we have so far onto the headers list so
1753 that it gets reflected in any error message, and back up the just-read
1756 if (message_size >= header_maxsize)
1758 next->text[ptr] = 0;
1760 next->type = htype_other;
1762 header_last->next = next;
1765 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1766 "%s (more than %d characters): message abandoned",
1767 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1771 smtp_reply = US"552 Message header is ridiculously long";
1772 receive_swallow_smtp();
1773 goto TIDYUP; /* Skip to end of function */
1778 give_local_error(ERRMESS_VLONGHEADER,
1779 string_sprintf("message header longer than %d characters received: "
1780 "message not accepted", header_maxsize), US"", error_rc, stdin,
1782 /* Does not return */
1786 continue; /* With next input character */
1788 /* End of header line reached */
1792 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1794 receive_linecount++;
1795 message_linecount++;
1797 /* Keep track of maximum line length */
1799 if (ptr - prevlines_length > max_received_linelength)
1800 max_received_linelength = ptr - prevlines_length;
1801 prevlines_length = ptr + 1;
1803 /* Now put in the terminating newline. There is always space for
1804 at least two more characters. */
1806 next->text[ptr++] = '\n';
1809 /* A blank line signals the end of the headers; release the unwanted
1810 space and set next to NULL to indicate this. */
1819 /* There is data in the line; see if the next input character is a
1820 whitespace character. If it is, we have a continuation of this header line.
1821 There is always space for at least one character at this point. */
1825 int nextch = (receive_getc)();
1826 if (nextch == ' ' || nextch == '\t')
1828 next->text[ptr++] = nextch;
1830 continue; /* Iterate the loop */
1832 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1833 else ch = EOF; /* Cause main loop to exit at end */
1836 /* We have got to the real line end. Terminate the string and release store
1837 beyond it. If it turns out to be a real header, internal binary zeros will
1838 be squashed later. */
1840 next->text[ptr] = 0;
1842 store_reset(next->text + ptr + 1);
1844 /* Check the running total size against the overall message size limit. We
1845 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1846 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1847 headers - the code to read the body will then also hit the buffer. */
1849 if (message_size > thismessage_size_limit) break;
1851 /* A line that is not syntactically correct for a header also marks
1852 the end of the headers. In this case, we leave next containing the
1853 first data line. This might actually be several lines because of the
1854 continuation logic applied above, but that doesn't matter.
1856 It turns out that smail, and presumably sendmail, accept leading lines
1859 From ph10 Fri Jan 5 12:35 GMT 1996
1861 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1862 find any documentation of this, but for compatibility it had better be
1863 accepted. Exim restricts it to the case of non-smtp messages, and
1864 treats it as an alternative to the -f command line option. Thus it is
1865 ignored except for trusted users or filter testing. Otherwise it is taken
1866 as the sender address, unless -f was used (sendmail compatibility).
1868 It further turns out that some UUCPs generate the From_line in a different
1871 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1873 The regex for matching these things is now capable of recognizing both
1874 formats (including 2- and 4-digit years in the latter). In fact, the regex
1875 is now configurable, as is the expansion string to fish out the sender.
1877 Even further on it has been discovered that some broken clients send
1878 these lines in SMTP messages. There is now an option to ignore them from
1879 specified hosts or networks. Sigh. */
1881 if (header_last == header_list &&
1884 (sender_host_address != NULL &&
1885 verify_check_host(&ignore_fromline_hosts) == OK)
1887 (sender_host_address == NULL && ignore_fromline_local)
1889 regex_match_and_setup(regex_From, next->text, 0, -1))
1891 if (!sender_address_forced)
1893 uschar *uucp_sender = expand_string(uucp_from_sender);
1894 if (uucp_sender == NULL)
1896 log_write(0, LOG_MAIN|LOG_PANIC,
1897 "expansion of \"%s\" failed after matching "
1898 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1902 int start, end, domain;
1904 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1905 &start, &end, &domain, TRUE);
1906 if (newsender != NULL)
1908 if (domain == 0 && newsender[0] != 0)
1909 newsender = rewrite_address_qualify(newsender, FALSE);
1911 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1913 sender_address = newsender;
1915 if (trusted_caller || filter_test != FTEST_NONE)
1917 authenticated_sender = NULL;
1918 originator_name = US"";
1919 sender_local = FALSE;
1922 if (filter_test != FTEST_NONE)
1923 printf("Sender taken from \"From \" line\n");
1930 /* Not a leading "From " line. Check to see if it is a valid header line.
1931 Header names may contain any non-control characters except space and colon,
1936 uschar *p = next->text;
1938 /* If not a valid header line, break from the header reading loop, leaving
1939 next != NULL, indicating that it holds the first line of the body. */
1941 if (isspace(*p)) break;
1942 while (mac_isgraph(*p) && *p != ':') p++;
1943 while (isspace(*p)) p++;
1946 body_zerocount = had_zero;
1950 /* We have a valid header line. If there were any binary zeroes in
1951 the line, stomp on them here. */
1954 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1956 /* It is perfectly legal to have an empty continuation line
1957 at the end of a header, but it is confusing to humans
1958 looking at such messages, since it looks like a blank line.
1959 Reduce confusion by removing redundant white space at the
1960 end. We know that there is at least one printing character
1961 (the ':' tested for above) so there is no danger of running
1964 p = next->text + ptr - 2;
1967 while (*p == ' ' || *p == '\t') p--;
1968 if (*p != '\n') break;
1969 ptr = (p--) - next->text + 1;
1970 message_size -= next->slen - ptr;
1971 next->text[ptr] = 0;
1975 /* Add the header to the chain */
1977 next->type = htype_other;
1979 header_last->next = next;
1982 /* Check the limit for individual line lengths. This comes after adding to
1983 the chain so that the failing line is reflected if a bounce is generated
1984 (for a local message). */
1986 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1988 log_write(0, LOG_MAIN, "overlong message header line received from "
1989 "%s (more than %d characters): message abandoned",
1990 sender_host_unknown? sender_ident : sender_fullhost,
1991 header_line_maxsize);
1995 smtp_reply = US"552 A message header line is too long";
1996 receive_swallow_smtp();
1997 goto TIDYUP; /* Skip to end of function */
2002 give_local_error(ERRMESS_VLONGHDRLINE,
2003 string_sprintf("message header line longer than %d characters "
2004 "received: message not accepted", header_line_maxsize), US"",
2005 error_rc, stdin, header_list->next);
2006 /* Does not return */
2010 /* Note if any resent- fields exist. */
2012 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2014 resents_exist = TRUE;
2015 resent_prefix = US"Resent-";
2019 /* The line has been handled. If we have hit EOF, break out of the loop,
2020 indicating no pending data line. */
2022 if (ch == EOF) { next = NULL; break; }
2024 /* Set up for the next header */
2027 next = store_get(sizeof(header_line));
2028 next->text = store_get(header_size);
2031 prevlines_length = 0;
2032 } /* Continue, starting to read the next header */
2034 /* At this point, we have read all the headers into a data structure in main
2035 store. The first header is still the dummy placeholder for the Received: header
2036 we are going to generate a bit later on. If next != NULL, it contains the first
2037 data line - which terminated the headers before reaching a blank line (not the
2042 debug_printf(">>Headers received:\n");
2043 for (h = header_list->next; h != NULL; h = h->next)
2044 debug_printf("%s", h->text);
2048 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2049 is dropped immediately after valid headers, the next thing we will see is EOF.
2050 We must test for this specially, as further down the reading of the data is
2051 skipped if already at EOF. */
2053 if (smtp_input && (receive_feof)())
2055 smtp_reply = handle_lost_connection(US" (after header)");
2057 goto TIDYUP; /* Skip to end of function */
2060 /* If this is a filter test run and no headers were read, output a warning
2061 in case there is a mistake in the test message. */
2063 if (filter_test != FTEST_NONE && header_list->next == NULL)
2064 printf("Warning: no message headers read\n");
2067 /* Scan the headers to identify them. Some are merely marked for later
2068 processing; some are dealt with here. */
2070 for (h = header_list->next; h != NULL; h = h->next)
2072 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2073 if (is_resent) contains_resent_headers = TRUE;
2075 switch (header_checkname(h, is_resent))
2078 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2082 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2085 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2088 if (!resents_exist || is_resent) date_header_exists = TRUE;
2091 /* Same comments as about Return-Path: below. */
2093 case htype_delivery_date:
2094 if (delivery_date_remove) h->type = htype_old;
2097 /* Same comments as about Return-Path: below. */
2099 case htype_envelope_to:
2100 if (envelope_to_remove) h->type = htype_old;
2103 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2104 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2105 header consists of just the login id of the user who called Exim, rewrite
2106 it with the gecos field first. Apply this rule to Resent-From: if there
2107 are resent- fields. */
2110 h->type = htype_from;
2111 if (!resents_exist || is_resent)
2117 uschar *s = Ustrchr(h->text, ':') + 1;
2118 while (isspace(*s)) s++;
2119 len = h->slen - (s - h->text) - 1;
2120 if (Ustrlen(originator_login) == len &&
2121 strncmpic(s, originator_login, len) == 0)
2123 uschar *name = is_resent? US"Resent-From" : US"From";
2124 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2125 originator_login, qualify_domain_sender);
2126 from_header = header_last;
2127 h->type = htype_old;
2128 DEBUG(D_receive|D_rewrite)
2129 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2135 /* Identify the Message-id: header for generating "in-reply-to" in the
2136 autoreply transport. For incoming logging, save any resent- value. In both
2137 cases, take just the first of any multiples. */
2140 if (msgid_header == NULL && (!resents_exist || is_resent))
2147 /* Flag all Received: headers */
2149 case htype_received:
2150 h->type = htype_received;
2154 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2156 case htype_reply_to:
2157 h->type = htype_reply_to;
2160 /* The Return-path: header is supposed to be added to messages when
2161 they leave the SMTP system. We shouldn't receive messages that already
2162 contain Return-path. However, since Exim generates Return-path: on
2163 local delivery, resent messages may well contain it. We therefore
2164 provide an option (which defaults on) to remove any Return-path: headers
2165 on input. Removal actually means flagging as "old", which prevents the
2166 header being transmitted with the message. */
2168 case htype_return_path:
2169 if (return_path_remove) h->type = htype_old;
2171 /* If we are testing a mail filter file, use the value of the
2172 Return-Path: header to set up the return_path variable, which is not
2173 otherwise set. However, remove any <> that surround the address
2174 because the variable doesn't have these. */
2176 if (filter_test != FTEST_NONE)
2178 uschar *start = h->text + 12;
2179 uschar *end = start + Ustrlen(start);
2180 while (isspace(*start)) start++;
2181 while (end > start && isspace(end[-1])) end--;
2182 if (*start == '<' && end[-1] == '>')
2187 return_path = string_copyn(start, end - start);
2188 printf("Return-path taken from \"Return-path:\" header line\n");
2192 /* If there is a "Sender:" header and the message is locally originated,
2193 and from an untrusted caller and suppress_local_fixups is not set, or if we
2194 are in submission mode for a remote message, mark it "old" so that it will
2195 not be transmitted with the message, unless active_local_sender_retain is
2196 set. (This can only be true if active_local_from_check is false.) If there
2197 are any resent- headers in the message, apply this rule to Resent-Sender:
2198 instead of Sender:. Messages with multiple resent- header sets cannot be
2199 tidily handled. (For this reason, at least one MUA - Pine - turns old
2200 resent- headers into X-resent- headers when resending, leaving just one
2204 h->type = ((!active_local_sender_retain &&
2206 (sender_local && !trusted_caller && !suppress_local_fixups)
2210 (!resents_exist||is_resent))?
2211 htype_old : htype_sender;
2214 /* Remember the Subject: header for logging. There is no Resent-Subject */
2220 /* "To:" gets flagged, and the existence of a recipient header is noted,
2221 whether it's resent- or not. */
2226 to_or_cc_header_exists = TRUE;
2232 /* Extract recipients from the headers if that is required (the -t option).
2233 Note that this is documented as being done *before* any address rewriting takes
2234 place. There are two possibilities:
2236 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2237 recipients already listed are to be REMOVED from the message. Smail 3 works
2238 like this. We need to build a non-recipients tree for that list, because in
2239 subsequent processing this data is held in a tree and that's what the
2240 spool_write_header() function expects. Make sure that non-recipient addresses
2241 are fully qualified and rewritten if necessary.
2243 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2244 those in the command line arguments (and it is rumoured some other MTAs do
2245 this). Therefore, there is an option to make Exim behave this way.
2247 *** Notes on "Resent-" header lines ***
2249 The presence of resent-headers in the message makes -t horribly ambiguous.
2250 Experiments with sendmail showed that it uses recipients for all resent-
2251 headers, totally ignoring the concept of "sets of resent- headers" as described
2252 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2253 with all the addresses in one instance of each header.
2255 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2256 error for -t if there were resent- headers in the message. However, after a
2257 discussion on the mailing list, I've learned that there are MUAs that use
2258 resent- headers with -t, and also that the stuff about sets of resent- headers
2259 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2260 message with -t and resent- header lines makes sure that only *its* resent-
2261 headers are present; previous ones are often renamed as X-resent- for example.
2263 Consequently, Exim has been changed so that, if any resent- header lines are
2264 present, the recipients are taken from all of the appropriate resent- lines,
2265 and not from the ordinary To:, Cc:, etc. */
2270 error_block **bnext = &bad_addresses;
2272 if (extract_addresses_remove_arguments)
2274 while (recipients_count-- > 0)
2276 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2277 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2278 tree_add_nonrecipient(s);
2280 recipients_list = NULL;
2281 recipients_count = recipients_list_max = 0;
2284 /* Now scan the headers */
2286 for (h = header_list->next; h != NULL; h = h->next)
2288 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2289 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2291 uschar *s = Ustrchr(h->text, ':') + 1;
2292 while (isspace(*s)) s++;
2294 parse_allow_group = TRUE; /* Allow address group syntax */
2298 uschar *ss = parse_find_address_end(s, FALSE);
2299 uschar *recipient, *errmess, *p, *pp;
2300 int start, end, domain;
2302 /* Check on maximum */
2304 if (recipients_max > 0 && ++rcount > recipients_max)
2306 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2307 US"message rejected: ", error_rc, stdin, NULL);
2308 /* Does not return */
2311 /* Make a copy of the address, and remove any internal newlines. These
2312 may be present as a result of continuations of the header line. The
2313 white space that follows the newline must not be removed - it is part
2316 pp = recipient = store_get(ss - s + 1);
2317 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2322 BOOL b = allow_utf8_domains;
2323 allow_utf8_domains = TRUE;
2325 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2329 if (string_is_utf8(recipient))
2330 message_smtputf8 = TRUE;
2332 allow_utf8_domains = b;
2336 /* Keep a list of all the bad addresses so we can send a single
2337 error message at the end. However, an empty address is not an error;
2338 just ignore it. This can come from an empty group list like
2340 To: Recipients of list:;
2342 If there are no recipients at all, an error will occur later. */
2344 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2346 int len = Ustrlen(s);
2347 error_block *b = store_get(sizeof(error_block));
2348 while (len > 0 && isspace(s[len-1])) len--;
2350 b->text1 = string_printing(string_copyn(s, len));
2356 /* If the recipient is already in the nonrecipients tree, it must
2357 have appeared on the command line with the option extract_addresses_
2358 remove_arguments set. Do not add it to the recipients, and keep a note
2359 that this has happened, in order to give a better error if there are
2360 no recipients left. */
2362 else if (recipient != NULL)
2364 if (tree_search(tree_nonrecipients, recipient) == NULL)
2365 receive_add_recipient(recipient, -1);
2367 extracted_ignored = TRUE;
2370 /* Move on past this address */
2372 s = ss + (*ss? 1:0);
2373 while (isspace(*s)) s++;
2374 } /* Next address */
2376 parse_allow_group = FALSE; /* Reset group syntax flags */
2377 parse_found_group = FALSE;
2379 /* If this was the bcc: header, mark it "old", which means it
2380 will be kept on the spool, but not transmitted as part of the
2383 if (h->type == htype_bcc) h->type = htype_old;
2384 } /* For appropriate header line */
2385 } /* For each header line */
2389 /* Now build the unique message id. This has changed several times over the
2390 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2391 Retaining all the history in the comment has become too unwieldy - read
2392 previous release sources if you want it.
2394 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2395 The first part is the current time, in seconds. The second part is the current
2396 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2397 can hold a number in the range 0-3843. It used to be a computed sequence
2398 number, but is now the fractional component of the current time in units of
2399 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2400 received, Exim ensures that the timer has ticked at the appropriate level
2401 before proceeding, to avoid duplication if the pid happened to be re-used
2402 within the same time period. It seems likely that most messages will take at
2403 least half a millisecond to be received, so no delay will normally be
2404 necessary. At least for some time...
2406 There is a modification when localhost_number is set. Formerly this was allowed
2407 to be as large as 255. Now it is restricted to the range 0-16, and the final
2408 component of the message id becomes (localhost_number * 200) + fractional time
2409 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2411 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2412 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2413 still allows the tttttt field to hold a large enough number to last for some
2414 more decades, and the final two-digit field can hold numbers up to 1295, which
2415 is enough for milliseconds (instead of 1/2000 of a second).
2417 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2418 pid, so it is probably safe because pids have to be positive. The
2419 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2420 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2422 Note that string_base62() returns its data in a static storage block, so it
2423 must be copied before calling string_base62() again. It always returns exactly
2426 There doesn't seem to be anything in the RFC which requires a message id to
2427 start with a letter, but Smail was changed to ensure this. The external form of
2428 the message id (as supplied by string expansion) therefore starts with an
2429 additional leading 'E'. The spool file names do not include this leading
2430 letter and it is not used internally.
2432 NOTE: If ever the format of message ids is changed, the regular expression for
2433 checking that a string is in this format must be updated in a corresponding
2434 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2435 must also be changed to reflect the correct string length. Then, of course,
2436 other programs that rely on the message id format will need updating too. */
2438 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2439 message_id[6] = '-';
2440 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2442 /* Deal with the case where the host number is set. The value of the number was
2443 checked when it was read, to ensure it isn't too big. The timing granularity is
2444 left in id_resolution so that an appropriate wait can be done after receiving
2445 the message, if necessary (we hope it won't be). */
2447 if (host_number_string != NULL)
2449 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2450 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2451 string_base62((long int)(
2452 host_number * (1000000/id_resolution) +
2453 message_id_tv.tv_usec/id_resolution)) + 4);
2456 /* Host number not set: final field is just the fractional time at an
2457 appropriate resolution. */
2461 id_resolution = (BASE_62 == 62)? 500 : 1000;
2462 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2463 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2466 /* Add the current message id onto the current process info string if
2469 (void)string_format(process_info + process_info_len,
2470 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2472 /* If we are using multiple input directories, set up the one for this message
2473 to be the least significant base-62 digit of the time of arrival. Otherwise
2474 ensure that it is an empty string. */
2476 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2478 /* Now that we have the message-id, if there is no message-id: header, generate
2479 one, but only for local (without suppress_local_fixups) or submission mode
2480 messages. This can be user-configured if required, but we had better flatten
2481 any illegal characters therein. */
2483 if (msgid_header == NULL &&
2484 ((sender_host_address == NULL && !suppress_local_fixups)
2485 || submission_mode))
2488 uschar *id_text = US"";
2489 uschar *id_domain = primary_hostname;
2491 /* Permit only letters, digits, dots, and hyphens in the domain */
2493 if (message_id_domain != NULL)
2495 uschar *new_id_domain = expand_string(message_id_domain);
2496 if (new_id_domain == NULL)
2498 if (!expand_string_forcedfail)
2499 log_write(0, LOG_MAIN|LOG_PANIC,
2500 "expansion of \"%s\" (message_id_header_domain) "
2501 "failed: %s", message_id_domain, expand_string_message);
2503 else if (*new_id_domain != 0)
2505 id_domain = new_id_domain;
2506 for (p = id_domain; *p != 0; p++)
2507 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2511 /* Permit all characters except controls and RFC 2822 specials in the
2512 additional text part. */
2514 if (message_id_text != NULL)
2516 uschar *new_id_text = expand_string(message_id_text);
2517 if (new_id_text == NULL)
2519 if (!expand_string_forcedfail)
2520 log_write(0, LOG_MAIN|LOG_PANIC,
2521 "expansion of \"%s\" (message_id_header_text) "
2522 "failed: %s", message_id_text, expand_string_message);
2524 else if (*new_id_text != 0)
2526 id_text = new_id_text;
2527 for (p = id_text; *p != 0; p++)
2528 if (mac_iscntrl_or_special(*p)) *p = '-';
2532 /* Add the header line
2533 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2534 * appended, to preserve classical expectations of header ordering. */
2536 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2537 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2538 (*id_text == 0)? "" : ".", id_text, id_domain);
2541 /* If we are to log recipients, keep a copy of the raw ones before any possible
2542 rewriting. Must copy the count, because later ACLs and the local_scan()
2543 function may mess with the real recipients. */
2545 if (LOGGING(received_recipients))
2547 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2548 for (i = 0; i < recipients_count; i++)
2549 raw_recipients[i] = string_copy(recipients_list[i].address);
2550 raw_recipients_count = recipients_count;
2553 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2554 recipients will get here only if the conditions were right (allow_unqualified_
2555 recipient is TRUE). */
2557 for (i = 0; i < recipients_count; i++)
2558 recipients_list[i].address =
2559 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2560 global_rewrite_rules, rewrite_existflags);
2562 /* If there is no From: header, generate one for local (without
2563 suppress_local_fixups) or submission_mode messages. If there is no sender
2564 address, but the sender is local or this is a local delivery error, use the
2565 originator login. This shouldn't happen for genuine bounces, but might happen
2566 for autoreplies. The addition of From: must be done *before* checking for the
2567 possible addition of a Sender: header, because untrusted_set_sender allows an
2568 untrusted user to set anything in the envelope (which might then get info
2569 From:) but we still want to ensure a valid Sender: if it is required. */
2571 if (from_header == NULL &&
2572 ((sender_host_address == NULL && !suppress_local_fixups)
2573 || submission_mode))
2575 uschar *oname = US"";
2577 /* Use the originator_name if this is a locally submitted message and the
2578 caller is not trusted. For trusted callers, use it only if -F was used to
2579 force its value or if we have a non-SMTP message for which -f was not used
2580 to set the sender. */
2582 if (sender_host_address == NULL)
2584 if (!trusted_caller || sender_name_forced ||
2585 (!smtp_input && !sender_address_forced))
2586 oname = originator_name;
2589 /* For non-locally submitted messages, the only time we use the originator
2590 name is when it was forced by the /name= option on control=submission. */
2594 if (submission_name != NULL) oname = submission_name;
2597 /* Envelope sender is empty */
2599 if (sender_address[0] == 0)
2601 uschar *fromstart, *fromend;
2603 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2604 oname, (oname[0] == 0)? "" : " <");
2605 fromend = (oname[0] == 0)? US"" : US">";
2607 if (sender_local || local_error_message)
2609 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2610 local_part_quote(originator_login), qualify_domain_sender,
2613 else if (submission_mode && authenticated_id != NULL)
2615 if (submission_domain == NULL)
2617 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2618 local_part_quote(authenticated_id), qualify_domain_sender,
2621 else if (submission_domain[0] == 0) /* empty => whole address set */
2623 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2628 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2629 local_part_quote(authenticated_id), submission_domain,
2632 from_header = header_last; /* To get it checked for Sender: */
2636 /* There is a non-null envelope sender. Build the header using the original
2637 sender address, before any rewriting that might have been done while
2642 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2644 (oname[0] == 0)? "" : " <",
2645 (sender_address_unrewritten == NULL)?
2646 sender_address : sender_address_unrewritten,
2647 (oname[0] == 0)? "" : ">");
2649 from_header = header_last; /* To get it checked for Sender: */
2654 /* If the sender is local (without suppress_local_fixups), or if we are in
2655 submission mode and there is an authenticated_id, check that an existing From:
2656 is correct, and if not, generate a Sender: header, unless disabled. Any
2657 previously-existing Sender: header was removed above. Note that sender_local,
2658 as well as being TRUE if the caller of exim is not trusted, is also true if a
2659 trusted caller did not supply a -f argument for non-smtp input. To allow
2660 trusted callers to forge From: without supplying -f, we have to test explicitly
2661 here. If the From: header contains more than one address, then the call to
2662 parse_extract_address fails, and a Sender: header is inserted, as required. */
2664 if (from_header != NULL &&
2665 (active_local_from_check &&
2666 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2667 (submission_mode && authenticated_id != NULL))
2670 BOOL make_sender = TRUE;
2671 int start, end, domain;
2673 uschar *from_address =
2674 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2675 &start, &end, &domain, FALSE);
2676 uschar *generated_sender_address;
2678 if (submission_mode)
2680 if (submission_domain == NULL)
2682 generated_sender_address = string_sprintf("%s@%s",
2683 local_part_quote(authenticated_id), qualify_domain_sender);
2685 else if (submission_domain[0] == 0) /* empty => full address */
2687 generated_sender_address = string_sprintf("%s",
2692 generated_sender_address = string_sprintf("%s@%s",
2693 local_part_quote(authenticated_id), submission_domain);
2697 generated_sender_address = string_sprintf("%s@%s",
2698 local_part_quote(originator_login), qualify_domain_sender);
2700 /* Remove permitted prefixes and suffixes from the local part of the From:
2701 address before doing the comparison with the generated sender. */
2703 if (from_address != NULL)
2706 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2708 if (at != NULL) *at = 0;
2709 from_address += route_check_prefix(from_address, local_from_prefix);
2710 slen = route_check_suffix(from_address, local_from_suffix);
2713 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2714 from_address += slen;
2716 if (at != NULL) *at = '@';
2718 if (strcmpic(generated_sender_address, from_address) == 0 ||
2719 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2720 make_sender = FALSE;
2723 /* We have to cause the Sender header to be rewritten if there are
2724 appropriate rewriting rules. */
2728 if (submission_mode && submission_name == NULL)
2729 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2730 generated_sender_address);
2732 header_add(htype_sender, "%sSender: %s <%s>\n",
2734 submission_mode? submission_name : originator_name,
2735 generated_sender_address);
2738 /* Ensure that a non-null envelope sender address corresponds to the
2739 submission mode sender address. */
2741 if (submission_mode && sender_address[0] != 0)
2743 if (sender_address_unrewritten == NULL)
2744 sender_address_unrewritten = sender_address;
2745 sender_address = generated_sender_address;
2746 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2747 log_write(L_address_rewrite, LOG_MAIN,
2748 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2749 sender_address_unrewritten, generated_sender_address);
2753 /* If there are any rewriting rules, apply them to the sender address, unless
2754 it has already been rewritten as part of verification for SMTP input. */
2756 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2757 sender_address[0] != 0)
2759 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2760 global_rewrite_rules, rewrite_existflags);
2761 DEBUG(D_receive|D_rewrite)
2762 debug_printf("rewritten sender = %s\n", sender_address);
2766 /* The headers must be run through rewrite_header(), because it ensures that
2767 addresses are fully qualified, as well as applying any rewriting rules that may
2770 Qualification of header addresses in a message from a remote host happens only
2771 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2772 appropriate. For local messages, qualification always happens, unless -bnq is
2773 used to explicitly suppress it. No rewriting is done for an unqualified address
2774 that is left untouched.
2776 We start at the second header, skipping our own Received:. This rewriting is
2777 documented as happening *after* recipient addresses are taken from the headers
2778 by the -t command line option. An added Sender: gets rewritten here. */
2780 for (h = header_list->next; h != NULL; h = h->next)
2782 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2783 rewrite_existflags, TRUE);
2784 if (newh != NULL) h = newh;
2788 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2789 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2790 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2791 exists, this applies to the set of resent- headers rather than the normal set.
2793 The requirement for a recipient header has been removed in RFC 2822. At this
2794 point in the code, earlier versions of Exim added a To: header for locally
2795 submitted messages, and an empty Bcc: header for others. In the light of the
2796 changes in RFC 2822, this was dropped in November 2003. */
2799 /* If there is no date header, generate one if the message originates locally
2800 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2801 submission mode flag is set. Messages without Date: are not valid, but it seems
2802 to be more confusing if Exim adds one to all remotely-originated messages.
2803 As per Message-Id, we prepend if resending, else append.
2806 if (!date_header_exists &&
2807 ((sender_host_address == NULL && !suppress_local_fixups)
2808 || submission_mode))
2809 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2810 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2812 search_tidyup(); /* Free any cached resources */
2814 /* Show the complete set of headers if debugging. Note that the first one (the
2815 new Received:) has not yet been set. */
2819 debug_printf(">>Headers after rewriting and local additions:\n");
2820 for (h = header_list->next; h != NULL; h = h->next)
2821 debug_printf("%c %s", h->type, h->text);
2825 /* The headers are now complete in store. If we are running in filter
2826 testing mode, that is all this function does. Return TRUE if the message
2827 ended with a dot. */
2829 if (filter_test != FTEST_NONE)
2831 process_info[process_info_len] = 0;
2832 return message_ended == END_DOT;
2835 /* Cutthrough delivery:
2836 We have to create the Received header now rather than at the end of reception,
2837 so the timestamp behaviour is a change to the normal case.
2838 XXX Ensure this gets documented XXX.
2839 Having created it, send the headers to the destination. */
2840 if (cutthrough.fd >= 0)
2842 if (received_count > received_headers_max)
2844 cancel_cutthrough_connection("too many headers");
2845 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2846 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2847 "Too many \"Received\" headers",
2849 (sender_fullhost == NULL)? "" : " H=",
2850 (sender_fullhost == NULL)? US"" : sender_fullhost,
2851 (sender_ident == NULL)? "" : " U=",
2852 (sender_ident == NULL)? US"" : sender_ident);
2853 message_id[0] = 0; /* Indicate no message accepted */
2854 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2855 goto TIDYUP; /* Skip to end of function */
2857 received_header_gen();
2858 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2859 (void) cutthrough_headers_send();
2863 /* Open a new spool file for the data portion of the message. We need
2864 to access it both via a file descriptor and a stream. Try to make the
2865 directory if it isn't there. */
2867 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
2868 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
2870 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
2872 if (errno == ENOENT)
2874 (void) directory_make(spool_directory,
2875 spool_sname(US"input", message_subdir),
2876 INPUT_DIRECTORY_MODE, TRUE);
2877 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2880 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2881 spool_name, strerror(errno));
2884 /* Make sure the file's group is the Exim gid, and double-check the mode
2885 because the group setting doesn't always get set automatically. */
2887 if (fchown(data_fd, exim_uid, exim_gid))
2888 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2889 "Failed setting ownership on spool file %s: %s",
2890 spool_name, strerror(errno));
2891 (void)fchmod(data_fd, SPOOL_MODE);
2893 /* We now have data file open. Build a stream for it and lock it. We lock only
2894 the first line of the file (containing the message ID) because otherwise there
2895 are problems when Exim is run under Cygwin (I'm told). See comments in
2896 spool_in.c, where the same locking is done. */
2898 data_file = fdopen(data_fd, "w+");
2899 lock_data.l_type = F_WRLCK;
2900 lock_data.l_whence = SEEK_SET;
2901 lock_data.l_start = 0;
2902 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2904 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2905 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2906 errno, strerror(errno));
2908 /* We have an open, locked data file. Write the message id to it to make it
2909 self-identifying. Then read the remainder of the input of this message and
2910 write it to the data file. If the variable next != NULL, it contains the first
2911 data line (which was read as a header but then turned out not to have the right
2912 format); write it (remembering that it might contain binary zeros). The result
2913 of fwrite() isn't inspected; instead we call ferror() below. */
2915 fprintf(data_file, "%s-D\n", message_id);
2918 uschar *s = next->text;
2919 int len = next->slen;
2920 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2921 body_linecount++; /* Assumes only 1 line */
2924 /* Note that we might already be at end of file, or the logical end of file
2925 (indicated by '.'), or might have encountered an error while writing the
2926 message id or "next" line. */
2928 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2932 message_ended = read_message_data_smtp(data_file);
2933 receive_linecount++; /* The terminating "." line */
2935 else message_ended = read_message_data(data_file);
2937 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2938 message_linecount += body_linecount;
2940 /* Handle premature termination of SMTP */
2942 if (smtp_input && message_ended == END_EOF)
2944 Uunlink(spool_name); /* Lose data file when closed */
2945 cancel_cutthrough_connection("sender closed connection");
2946 message_id[0] = 0; /* Indicate no message accepted */
2947 smtp_reply = handle_lost_connection(US"");
2949 goto TIDYUP; /* Skip to end of function */
2952 /* Handle message that is too big. Don't use host_or_ident() in the log
2953 message; we want to see the ident value even for non-remote messages. */
2955 if (message_ended == END_SIZE)
2957 Uunlink(spool_name); /* Lose the data file when closed */
2958 cancel_cutthrough_connection("mail too big");
2959 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2961 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2962 "message too big: read=%d max=%d",
2964 (sender_fullhost == NULL)? "" : " H=",
2965 (sender_fullhost == NULL)? US"" : sender_fullhost,
2966 (sender_ident == NULL)? "" : " U=",
2967 (sender_ident == NULL)? US"" : sender_ident,
2969 thismessage_size_limit);
2973 smtp_reply = US"552 Message size exceeds maximum permitted";
2974 message_id[0] = 0; /* Indicate no message accepted */
2975 goto TIDYUP; /* Skip to end of function */
2979 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2980 give_local_error(ERRMESS_TOOBIG,
2981 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2982 US"message rejected: ", error_rc, data_file, header_list);
2983 /* Does not return */
2988 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2989 example, there may be some expansion in an ACL that uses a timer.) */
2991 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2993 /* The message body has now been read into the data file. Call fflush() to
2994 empty the buffers in C, and then call fsync() to get the data written out onto
2995 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2996 having to do this). If there was an I/O error on either input or output,
2997 attempt to send an error message, and unlink the spool file. For non-SMTP input
2998 we can then give up. Note that for SMTP input we must swallow the remainder of
2999 the input in cases of output errors, since the far end doesn't expect to see
3000 anything until the terminating dot line is sent. */
3002 if (fflush(data_file) == EOF || ferror(data_file) ||
3003 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3005 uschar *msg_errno = US strerror(errno);
3006 BOOL input_error = (receive_ferror)() != 0;
3007 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3008 input_error? "Input read" : "Spool write",
3010 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3012 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3013 Uunlink(spool_name); /* Lose the data file */
3014 cancel_cutthrough_connection("error writing spoolfile");
3019 smtp_reply = US"451 Error while reading input data";
3022 smtp_reply = US"451 Error while writing spool file";
3023 receive_swallow_smtp();
3025 message_id[0] = 0; /* Indicate no message accepted */
3026 goto TIDYUP; /* Skip to end of function */
3031 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3032 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3034 /* Does not return */
3039 /* No I/O errors were encountered while writing the data file. */
3041 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3044 /* If there were any bad addresses extracted by -t, or there were no recipients
3045 left after -t, send a message to the sender of this message, or write it to
3046 stderr if the error handling option is set that way. Note that there may
3047 legitimately be no recipients for an SMTP message if they have all been removed
3050 We need to rewind the data file in order to read it. In the case of no
3051 recipients or stderr error writing, throw the data file away afterwards, and
3052 exit. (This can't be SMTP, which always ensures there's at least one
3053 syntactically good recipient address.) */
3055 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3059 if (recipients_count == 0) debug_printf("*** No recipients\n");
3060 if (bad_addresses != NULL)
3062 error_block *eblock = bad_addresses;
3063 debug_printf("*** Bad address(es)\n");
3064 while (eblock != NULL)
3066 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3067 eblock = eblock->next;
3072 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3074 /* If configured to send errors to the sender, but this fails, force
3075 a failure error code. We use a special one for no recipients so that it
3076 can be detected by the autoreply transport. Otherwise error_rc is set to
3077 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3078 it is EXIT_SUCCESS. */
3080 if (error_handling == ERRORS_SENDER)
3082 if (!moan_to_sender(
3083 (bad_addresses == NULL)?
3084 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3085 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3086 bad_addresses, header_list, data_file, FALSE))
3087 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3091 if (bad_addresses == NULL)
3093 if (extracted_ignored)
3094 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3096 fprintf(stderr, "exim: no recipients in message\n");
3100 fprintf(stderr, "exim: invalid address%s",
3101 (bad_addresses->next == NULL)? ":" : "es:\n");
3102 while (bad_addresses != NULL)
3104 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3105 bad_addresses->text2);
3106 bad_addresses = bad_addresses->next;
3111 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3113 Uunlink(spool_name);
3114 (void)fclose(data_file);
3115 exim_exit(error_rc);
3119 /* Data file successfully written. Generate text for the Received: header by
3120 expanding the configured string, and adding a timestamp. By leaving this
3121 operation till now, we ensure that the timestamp is the time that message
3122 reception was completed. However, this is deliberately done before calling the
3123 data ACL and local_scan().
3125 This Received: header may therefore be inspected by the data ACL and by code in
3126 the local_scan() function. When they have run, we update the timestamp to be
3127 the final time of reception.
3129 If there is just one recipient, set up its value in the $received_for variable
3130 for use when we generate the Received: header.
3132 Note: the checking for too many Received: headers is handled by the delivery
3134 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3136 if (received_header->text == NULL) /* Non-cutthrough case */
3138 received_header_gen();
3140 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3142 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3143 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3145 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3146 now, before running the DATA ACL. */
3148 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3151 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3152 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3154 /* If an ACL is specified for checking things at this stage of reception of a
3155 message, run it, unless all the recipients were removed by "discard" in earlier
3156 ACLs. That is the only case in which recipients_count can be zero at this
3157 stage. Set deliver_datafile to point to the data file so that $message_body and
3158 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3161 deliver_datafile = data_fd;
3164 enable_dollar_recipients = TRUE;
3166 if (recipients_count == 0)
3168 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3172 /* Handle interactive SMTP messages */
3174 if (smtp_input && !smtp_batched_input)
3177 #ifndef DISABLE_DKIM
3178 if (!dkim_disable_verify)
3180 /* Finish verification, this will log individual signature results to
3182 dkim_exim_verify_finish();
3184 /* Check if we must run the DKIM ACL */
3185 if ((acl_smtp_dkim != NULL) &&
3186 (dkim_verify_signers != NULL) &&
3187 (dkim_verify_signers[0] != '\0'))
3189 uschar *dkim_verify_signers_expanded =
3190 expand_string(dkim_verify_signers);
3191 if (dkim_verify_signers_expanded == NULL)
3193 log_write(0, LOG_MAIN|LOG_PANIC,
3194 "expansion of dkim_verify_signers option failed: %s",
3195 expand_string_message);
3200 const uschar *ptr = dkim_verify_signers_expanded;
3201 uschar *item = NULL;
3202 uschar *seen_items = NULL;
3203 int seen_items_size = 0;
3204 int seen_items_offset = 0;
3205 uschar itembuf[256];
3206 /* Default to OK when no items are present */
3208 while ((item = string_nextinlist(&ptr, &sep,
3212 /* Prevent running ACL for an empty item */
3213 if (!item || (item[0] == '\0')) continue;
3215 /* Only run ACL once for each domain or identity,
3216 no matter how often it appears in the expanded list. */
3219 uschar *seen_item = NULL;
3220 uschar seen_item_buf[256];
3221 const uschar *seen_items_list = seen_items;
3222 BOOL seen_this_item = FALSE;
3224 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3226 sizeof(seen_item_buf))))
3227 if (Ustrcmp(seen_item,item) == 0)
3229 seen_this_item = TRUE;
3236 debug_printf("acl_smtp_dkim: skipping signer %s, "
3237 "already seen\n", item);
3241 seen_items = string_append(seen_items, &seen_items_size,
3242 &seen_items_offset, 1, ":");
3245 seen_items = string_append(seen_items, &seen_items_size,
3246 &seen_items_offset, 1, item);
3247 seen_items[seen_items_offset] = '\0';
3250 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3253 dkim_exim_acl_setup(item);
3254 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3255 &user_msg, &log_msg);
3260 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3261 "skipping remaining items\n", rc, item);
3262 cancel_cutthrough_connection("dkim acl not ok");
3266 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3269 recipients_count = 0;
3270 blackholed_by = US"DKIM ACL";
3271 if (log_msg != NULL)
3272 blackhole_log_msg = string_sprintf(": %s", log_msg);
3276 Uunlink(spool_name);
3277 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3278 smtp_yield = FALSE; /* No more messages after dropped connection */
3279 smtp_reply = US""; /* Indicate reply already sent */
3280 message_id[0] = 0; /* Indicate no message accepted */
3281 goto TIDYUP; /* Skip to end of function */
3286 #endif /* DISABLE_DKIM */
3288 #ifdef WITH_CONTENT_SCAN
3289 if (recipients_count > 0 &&
3290 acl_smtp_mime != NULL &&
3291 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3293 #endif /* WITH_CONTENT_SCAN */
3295 #ifdef EXPERIMENTAL_DMARC
3296 dmarc_up = dmarc_store_data(from_header);
3297 #endif /* EXPERIMENTAL_DMARC */
3299 #ifndef DISABLE_PRDR
3300 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3304 int all_fail = FAIL;
3306 smtp_printf("353 PRDR content analysis beginning\r\n");
3307 /* Loop through recipients, responses must be in same order received */
3308 for (c = 0; recipients_count > c; c++)
3310 uschar * addr= recipients_list[c].address;
3311 uschar * msg= US"PRDR R=<%s> %s";
3314 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3315 addr, c+1, recipients_count);
3316 rc = acl_check(ACL_WHERE_PRDR, addr,
3317 acl_smtp_data_prdr, &user_msg, &log_msg);
3319 /* If any recipient rejected content, indicate it in final message */
3321 /* If all recipients rejected, indicate in final message */
3326 case OK: case DISCARD: code = US"250"; break;
3327 case DEFER: code = US"450"; break;
3328 default: code = US"550"; break;
3330 if (user_msg != NULL)
3331 smtp_user_msg(code, user_msg);
3336 case OK: case DISCARD:
3337 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3339 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3341 msg = string_sprintf(CS msg, addr, "refusal"); break;
3343 smtp_user_msg(code, msg);
3345 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3346 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3347 else log_write(0, LOG_MAIN, "%s", CS msg);
3349 if (rc != OK) { receive_remove_recipient(addr); c--; }
3351 /* Set up final message, used if data acl gives OK */
3352 smtp_reply = string_sprintf("%s id=%s message %s",
3353 all_fail == FAIL ? US"550" : US"250",
3356 ? US"rejected for all recipients"
3359 : US"accepted for some recipients");
3360 if (recipients_count == 0)
3362 message_id[0] = 0; /* Indicate no message accepted */
3367 prdr_requested = FALSE;
3368 #endif /* !DISABLE_PRDR */
3370 /* Check the recipients count again, as the MIME ACL might have changed
3373 if (acl_smtp_data != NULL && recipients_count > 0)
3375 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3376 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3379 recipients_count = 0;
3380 blackholed_by = US"DATA ACL";
3381 if (log_msg != NULL)
3382 blackhole_log_msg = string_sprintf(": %s", log_msg);
3383 cancel_cutthrough_connection("data acl discard");
3387 Uunlink(spool_name);
3388 cancel_cutthrough_connection("data acl not ok");
3389 #ifdef WITH_CONTENT_SCAN
3392 #ifdef EXPERIMENTAL_DCC
3395 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3396 smtp_yield = FALSE; /* No more messages after dropped connection */
3397 smtp_reply = US""; /* Indicate reply already sent */
3398 message_id[0] = 0; /* Indicate no message accepted */
3399 goto TIDYUP; /* Skip to end of function */
3404 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3405 we cannot take different actions for permanent and temporary rejections. */
3410 #ifdef WITH_CONTENT_SCAN
3411 if (acl_not_smtp_mime != NULL &&
3412 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3415 #endif /* WITH_CONTENT_SCAN */
3417 if (acl_not_smtp != NULL)
3419 uschar *user_msg, *log_msg;
3420 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3423 recipients_count = 0;
3424 blackholed_by = US"non-SMTP ACL";
3425 if (log_msg != NULL)
3426 blackhole_log_msg = string_sprintf(": %s", log_msg);
3430 Uunlink(spool_name);
3431 #ifdef WITH_CONTENT_SCAN
3434 #ifdef EXPERIMENTAL_DCC
3437 /* The ACL can specify where rejections are to be logged, possibly
3438 nowhere. The default is main and reject logs. */
3440 if (log_reject_target != 0)
3441 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3442 sender_address, log_msg);
3444 if (user_msg == NULL) user_msg = US"local configuration problem";
3445 if (smtp_batched_input)
3447 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3448 /* Does not return */
3452 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3453 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3454 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3456 /* Does not return */
3459 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3463 /* The applicable ACLs have been run */
3465 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3466 if (queue_only_policy) queued_by = US"ACL";
3469 #ifdef WITH_CONTENT_SCAN
3473 #ifdef EXPERIMENTAL_DCC
3478 /* The final check on the message is to run the scan_local() function. The
3479 version supplied with Exim always accepts, but this is a hook for sysadmins to
3480 supply their own checking code. The local_scan() function is run even when all
3481 the recipients have been discarded. */
3483 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3485 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3486 deleted, and the incident gets logged. */
3488 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3489 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3490 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3491 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3493 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3494 local_scan_timeout);
3495 local_scan_data = NULL;
3497 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3498 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3499 rc = local_scan(data_fd, &local_scan_data);
3501 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3503 enable_dollar_recipients = FALSE;
3505 store_pool = POOL_MAIN; /* In case changed */
3506 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3509 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3510 os_non_restarting_signal(SIGFPE, SIG_DFL);
3511 os_non_restarting_signal(SIGILL, SIG_DFL);
3512 os_non_restarting_signal(SIGBUS, SIG_DFL);
3514 /* The length check is paranoia against some runaway code, and also because
3515 (for a success return) lines in the spool file are read into big_buffer. */
3517 if (local_scan_data != NULL)
3519 int len = Ustrlen(local_scan_data);
3520 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3521 local_scan_data = string_copyn(local_scan_data, len);
3524 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3526 if (!deliver_freeze) /* ACL might have already frozen */
3528 deliver_freeze = TRUE;
3529 deliver_frozen_at = time(NULL);
3530 frozen_by = US"local_scan()";
3532 rc = LOCAL_SCAN_ACCEPT;
3534 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3536 if (!queue_only_policy) /* ACL might have already queued */
3538 queue_only_policy = TRUE;
3539 queued_by = US"local_scan()";
3541 rc = LOCAL_SCAN_ACCEPT;
3544 /* Message accepted: remove newlines in local_scan_data because otherwise
3545 the spool file gets corrupted. Ensure that all recipients are qualified. */
3547 if (rc == LOCAL_SCAN_ACCEPT)
3549 if (local_scan_data != NULL)
3552 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3554 for (i = 0; i < recipients_count; i++)
3556 recipient_item *r = recipients_list + i;
3557 r->address = rewrite_address_qualify(r->address, TRUE);
3558 if (r->errors_to != NULL)
3559 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3561 if (recipients_count == 0 && blackholed_by == NULL)
3562 blackholed_by = US"local_scan";
3565 /* Message rejected: newlines permitted in local_scan_data to generate
3566 multiline SMTP responses. */
3570 uschar *istemp = US"";
3576 errmsg = local_scan_data;
3578 Uunlink(spool_name); /* Cancel this message */
3582 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3583 "rejection given", rc);
3586 case LOCAL_SCAN_REJECT_NOLOGHDR:
3587 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3590 case LOCAL_SCAN_REJECT:
3591 smtp_code = US"550";
3592 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3595 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3596 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3599 case LOCAL_SCAN_TEMPREJECT:
3601 smtp_code = US"451";
3602 if (errmsg == NULL) errmsg = US"Temporary local problem";
3603 istemp = US"temporarily ";
3607 s = string_append(s, &size, &sptr, 2, US"F=",
3608 (sender_address[0] == 0)? US"<>" : sender_address);
3609 s = add_host_info_for_log(s, &size, &sptr);
3612 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3613 s, istemp, string_printing(errmsg));
3617 if (!smtp_batched_input)
3619 smtp_respond(smtp_code, 3, TRUE, errmsg);
3620 message_id[0] = 0; /* Indicate no message accepted */
3621 smtp_reply = US""; /* Indicate reply already sent */
3622 goto TIDYUP; /* Skip to end of function */
3626 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3627 /* Does not return */
3632 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3633 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3634 US"message rejected by local scan code: ", error_rc, data_file,
3636 /* Does not return */
3640 /* Reset signal handlers to ignore signals that previously would have caused
3641 the message to be abandoned. */
3643 signal(SIGTERM, SIG_IGN);
3644 signal(SIGINT, SIG_IGN);
3647 /* Ensure the first time flag is set in the newly-received message. */
3649 deliver_firsttime = TRUE;
3651 #ifdef EXPERIMENTAL_BRIGHTMAIL
3653 { /* rewind data file */
3654 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3655 bmi_verdicts = bmi_process_message(header_list, data_fd);
3659 /* Update the timstamp in our Received: header to account for any time taken by
3660 an ACL or by local_scan(). The new time is the time that all reception
3661 processing is complete. */
3663 timestamp = expand_string(US"${tod_full}");
3664 tslen = Ustrlen(timestamp);
3666 memcpy(received_header->text + received_header->slen - tslen - 1,
3669 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3673 deliver_freeze = FALSE;
3674 queue_only_policy = FALSE;
3677 /* Keep the data file open until we have written the header file, in order to
3678 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3679 don't write the header file, and we unlink the data file. If writing the header
3680 file fails, we have failed to accept this message. */
3682 if (host_checking || blackholed_by != NULL)
3685 Uunlink(spool_name);
3686 msg_size = 0; /* Compute size for log line */
3687 for (h = header_list; h != NULL; h = h->next)
3688 if (h->type != '*') msg_size += h->slen;
3691 /* Write the -H file */
3694 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3696 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3697 Uunlink(spool_name); /* Lose the data file */
3701 smtp_reply = US"451 Error in writing spool file";
3702 message_id[0] = 0; /* Indicate no message accepted */
3707 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3708 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3710 /* Does not return */
3715 /* The message has now been successfully received. */
3717 receive_messagecount++;
3719 /* In SMTP sessions we may receive several in one connection. After each one,
3720 we wait for the clock to tick at the level of message-id granularity. This is
3721 so that the combination of time+pid is unique, even on systems where the pid
3722 can be re-used within our time interval. We can't shorten the interval without
3723 re-designing the message-id. See comments above where the message id is
3724 created. This is Something For The Future. */
3726 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3727 exim_wait_tick(&message_id_tv, id_resolution);
3729 /* Add data size to written header size. We do not count the initial file name
3730 that is in the file, but we do add one extra for the notional blank line that
3731 precedes the data. This total differs from message_size in that it include the
3732 added Received: header and any other headers that got created locally. */
3735 fstat(data_fd, &statbuf);
3737 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3739 /* Generate a "message received" log entry. We do this by building up a dynamic
3740 string as required. Since we commonly want to add two items at a time, use a
3741 macro to simplify the coding. We log the arrival of a new message while the
3742 file is still locked, just in case the machine is *really* fast, and delivers
3743 it first! Include any message id that is in the message - since the syntax of a
3744 message id is actually an addr-spec, we can use the parse routine to canonicize
3749 s = store_get(size);
3751 s = string_append(s, &size, &sptr, 2, US"<= ",
3752 (sender_address[0] == 0)? US"<>" : sender_address);
3753 if (message_reference != NULL)
3754 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3756 s = add_host_info_for_log(s, &size, &sptr);
3759 if (LOGGING(tls_cipher) && tls_in.cipher)
3760 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3761 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3762 s = string_append(s, &size, &sptr, 2, US" CV=",
3763 tls_in.certificate_verified? "yes":"no");
3764 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3765 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3766 string_printing(tls_in.peerdn), US"\"");
3767 if (LOGGING(tls_sni) && tls_in.sni)
3768 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3769 string_printing(tls_in.sni), US"\"");
3772 if (sender_host_authenticated)
3774 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3775 if (authenticated_id != NULL)
3777 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3778 if (LOGGING(smtp_mailauth) && authenticated_sender != NULL)
3779 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3783 #ifndef DISABLE_PRDR
3785 s = string_append(s, &size, &sptr, 1, US" PRDR");
3788 #ifdef SUPPORT_PROXY
3789 if (proxy_session && LOGGING(proxy))
3790 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3793 sprintf(CS big_buffer, "%d", msg_size);
3794 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3796 /* log 8BITMIME mode announced in MAIL_FROM
3800 if (LOGGING(8bitmime))
3802 sprintf(CS big_buffer, "%d", body_8bitmime);
3803 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3807 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
3809 /* If an addr-spec in a message-id contains a quoted string, it can contain
3810 any characters except " \ and CR and so in particular it can contain NL!
3811 Therefore, make sure we use a printing-characters only version for the log.
3812 Also, allow for domain literals in the message id. */
3814 if (msgid_header != NULL)
3817 BOOL save_allow_domain_literals = allow_domain_literals;
3818 allow_domain_literals = TRUE;
3819 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3820 &errmsg, &start, &end, &domain, FALSE);
3821 allow_domain_literals = save_allow_domain_literals;
3823 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3826 /* If subject logging is turned on, create suitable printing-character
3827 text. By expanding $h_subject: we make use of the MIME decoding. */
3829 if (LOGGING(subject) && subject_header != NULL)
3832 uschar *p = big_buffer;
3833 uschar *ss = expand_string(US"$h_subject:");
3835 /* Backslash-quote any double quotes or backslashes so as to make a
3836 a C-like string, and turn any non-printers into escape sequences. */
3839 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3841 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3846 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3849 /* Terminate the string: string_cat() and string_append() leave room, but do
3850 not put the zero in. */
3854 /* Create a message log file if message logs are being used and this message is
3855 not blackholed. Write the reception stuff to it. We used to leave message log
3856 creation until the first delivery, but this has proved confusing for some
3859 if (message_logs && blackholed_by == NULL)
3863 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
3865 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
3869 (void)directory_make(spool_directory,
3870 spool_sname(US"msglog", message_subdir),
3871 MSGLOG_DIRECTORY_MODE, TRUE);
3872 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3877 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3878 spool_name, strerror(errno));
3883 FILE *message_log = fdopen(fd, "a");
3884 if (message_log == NULL)
3886 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3887 spool_name, strerror(errno));
3892 uschar *now = tod_stamp(tod_log);
3893 fprintf(message_log, "%s Received from %s\n", now, s+3);
3894 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3896 if (queue_only_policy) fprintf(message_log,
3897 "%s no immediate delivery: queued%s%s by %s\n", now,
3898 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
3900 (void)fclose(message_log);
3905 /* Everything has now been done for a successful message except logging its
3906 arrival, and outputting an SMTP response. While writing to the log, set a flag
3907 to cause a call to receive_bomb_out() if the log cannot be opened. */
3909 receive_call_bombout = TRUE;
3911 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3912 connection has gone away. This can only be done if there is no unconsumed input
3913 waiting in the local input buffer. We can test for this by calling
3914 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3915 input to be sent following the final dot, so the presence of following input is
3918 If the connection is still present, but there is no unread input for the
3919 socket, the result of a select() call will be zero. If, however, the connection
3920 has gone away, or if there is pending input, the result of select() will be
3921 non-zero. The two cases can be distinguished by trying to read the next input
3922 character. If we succeed, we can unread it so that it remains in the local
3923 buffer for handling later. If not, the connection has been lost.
3925 Of course, since TCP/IP is asynchronous, there is always a chance that the
3926 connection will vanish between the time of this test and the sending of the
3927 response, but the chance of this happening should be small. */
3929 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3930 !receive_smtp_buffered())
3933 fd_set select_check;
3934 FD_ZERO(&select_check);
3935 FD_SET(fileno(smtp_in), &select_check);
3939 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3941 int c = (receive_getc)();
3942 if (c != EOF) (receive_ungetc)(c); else
3944 uschar *msg = US"SMTP connection lost after final dot";
3945 smtp_reply = US""; /* No attempt to send a response */
3946 smtp_yield = FALSE; /* Nothing more on this connection */
3948 /* Re-use the log line workspace */
3951 s = string_cat(s, &size, &sptr, msg);
3952 s = add_host_info_for_log(s, &size, &sptr);
3954 log_write(0, LOG_MAIN, "%s", s);
3956 /* Delete the files for this aborted message. */
3958 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
3959 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
3960 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
3967 /* The connection has not gone away; we really are going to take responsibility
3968 for this message. */
3970 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
3973 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
3974 the sender's dot (below).
3975 If rejected: copy response to sender, wipe the spooled files, log approriately.
3976 If temp-reject: accept to sender, keep the spooled files.
3978 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3980 XXX We do not handle queue-only, freezing, or blackholes.
3982 if(cutthrough.fd >= 0)
3984 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the message */
3985 /* Logging was done in finaldot() */
3988 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3989 cutthrough_done = ACCEPTED;
3990 break; /* message_id needed for SMTP accept below */
3992 default: /* Unknown response, or error. Treat as temp-reject. */
3993 case '4': /* Temp-reject. Keep spoolfiles and accept. */
3994 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
3995 break; /* message_id needed for SMTP accept below */
3997 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
3998 smtp_reply= msg; /* Pass on the exact error */
3999 cutthrough_done = PERM_REJ;
4004 #ifndef DISABLE_PRDR
4005 if(!smtp_reply || prdr_requested)
4010 log_write(0, LOG_MAIN |
4011 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4012 (LOGGING(received_sender)? LOG_SENDER : 0),
4015 /* Log any control actions taken by an ACL or local_scan(). */
4017 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4018 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4019 "no immediate delivery: queued%s%s by %s",
4020 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4023 receive_call_bombout = FALSE;
4025 store_reset(s); /* The store for the main log message can be reused */
4027 /* If the message is frozen, and freeze_tell is set, do the telling. */
4029 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4031 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4032 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4033 message_id, frozen_by, sender_address);
4037 /* Either a message has been successfully received and written to the two spool
4038 files, or an error in writing the spool has occurred for an SMTP message, or
4039 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4040 we will have already given up because there's no point in carrying on!) In
4041 either event, we must now close (and thereby unlock) the data file. In the
4042 successful case, this leaves the message on the spool, ready for delivery. In
4043 the error case, the spool file will be deleted. Then tidy up store, interact
4044 with an SMTP call if necessary, and return.
4046 A fflush() was done earlier in the expectation that any write errors on the
4047 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4048 possible for fclose() to fail - but what to do? What has happened to the lock
4053 process_info[process_info_len] = 0; /* Remove message id */
4054 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4056 /* Now reset signal handlers to their defaults */
4058 signal(SIGTERM, SIG_DFL);
4059 signal(SIGINT, SIG_DFL);
4061 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4062 value, which defaults TRUE - meaning there may be more incoming messages from
4063 this connection. For non-SMTP callers (where there is only ever one message),
4064 the default is FALSE. */
4070 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4071 is set to the response that should be sent. When it is NULL, we generate
4072 default responses. After an ACL error or local_scan() error, the response has
4073 already been sent, and smtp_reply is an empty string to indicate this. */
4075 if (!smtp_batched_input)
4077 if (smtp_reply == NULL)
4079 if (fake_response != OK)
4080 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4081 fake_response_text);
4083 /* An OK response is required; use "message" text if present. */
4085 else if (user_msg != NULL)
4087 uschar *code = US"250";
4089 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4090 smtp_respond(code, len, TRUE, user_msg);
4093 /* Default OK response */
4096 smtp_printf("250 OK id=%s\r\n", message_id);
4099 "\n**** SMTP testing: that is not a real message id!\n\n");
4102 /* smtp_reply is set non-empty */
4104 else if (smtp_reply[0] != 0)
4106 if (fake_response != OK && (smtp_reply[0] == '2'))
4107 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4108 fake_response_text);
4110 smtp_printf("%.1024s\r\n", smtp_reply);
4113 switch (cutthrough_done)
4115 case ACCEPTED: log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4117 { /* Delete spool files */
4118 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4119 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4120 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4122 case TMP_REJ: message_id[0] = 0; /* Prevent a delivery from starting */
4125 cutthrough.delivery = FALSE;
4128 /* For batched SMTP, generate an error message on failure, and do
4129 nothing on success. The function moan_smtp_batch() does not return -
4130 it exits from the program with a non-zero return code. */
4132 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
4136 /* If blackholing, we can immediately log this message's sad fate. The data
4137 file has already been unlinked, and the header file was never written to disk.
4138 We must now indicate that nothing was received, to prevent a delivery from
4141 if (blackholed_by != NULL)
4143 const uschar *detail = local_scan_data
4144 ? string_printing(local_scan_data)
4145 : string_sprintf("(%s discarded recipients)", blackholed_by);
4146 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4147 log_write(0, LOG_MAIN, "Completed");
4151 /* Reset headers so that logging of rejects for a subsequent message doesn't
4152 include them. It is also important to set header_last = NULL before exiting
4153 from this function, as this prevents certain rewrites that might happen during
4154 subsequent verifying (of another incoming message) from trying to add headers
4155 when they shouldn't. */
4157 header_list = header_last = NULL;
4159 return yield; /* TRUE if more messages (SMTP only) */
4162 /* End of receive.c */