1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
12 #ifdef EXPERIMENTAL_DCC
16 #ifdef EXPERIMENTAL_DMARC
18 #endif /* EXPERIMENTAL_DMARC */
20 /*************************************************
21 * Local static variables *
22 *************************************************/
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
30 /*************************************************
31 * Non-SMTP character reading functions *
32 *************************************************/
34 /* These are the default functions that are set up in the variables such as
35 receive_getc initially. They just call the standard functions, passing stdin as
36 the file. (When SMTP input is occurring, different functions are used by
37 changing the pointer variables.) */
48 return ungetc(c, stdin);
66 /*************************************************
67 * Check that a set sender is allowed *
68 *************************************************/
70 /* This function is called when a local caller sets an explicit sender address.
71 It checks whether this is permitted, which it is for trusted callers.
72 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74 Arguments: the proposed sender address
75 Returns: TRUE for a trusted caller
76 TRUE if the address has been set, untrusted_set_sender has been
77 set, and the address matches something in the list
82 receive_check_set_sender(uschar *newsender)
85 if (trusted_caller) return TRUE;
86 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
87 qnewsender = (Ustrchr(newsender, '@') != NULL)?
88 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 match_address_list(qnewsender, TRUE, TRUE, CUSS &untrusted_set_sender, NULL, -1,
97 /*************************************************
98 * Read space info for a partition *
99 *************************************************/
101 /* This function is called by receive_check_fs() below, and also by string
102 expansion for variables such as $spool_space. The field names for the statvfs
103 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
104 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
105 have inodes, and they return -1 for the number available.
107 Later: It turns out that some file systems that do not have the concept of
108 inodes return 0 rather than -1. Such systems should also return 0 for the total
109 number of inodes, so we require that to be greater than zero before returning
113 isspool TRUE for spool partition, FALSE for log partition
114 inodeptr address of int to receive inode count; -1 if there isn't one
116 Returns: available on-root space, in kilobytes
117 -1 for log partition if there isn't one
119 All values are -1 if the STATFS functions are not available.
123 receive_statvfs(BOOL isspool, int *inodeptr)
126 struct STATVFS statbuf;
131 /* The spool directory must always exist. */
135 path = spool_directory;
139 /* Need to cut down the log file path to the directory, and to ignore any
140 appearance of "syslog" in it. */
144 int sep = ':'; /* Not variable - outside scripts use */
145 const uschar *p = log_file_path;
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
151 if (*p == 0) p = US":";
152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
153 if (Ustrcmp(path, "syslog") != 0)
156 if (path == NULL) /* No log files */
162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
164 subdirectory has been symbolically linked elsewhere. */
168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
178 /* We now have the path; do the business */
180 memset(&statbuf, 0, sizeof(statbuf));
182 if (STATVFS(CS path, &statbuf) != 0)
184 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
185 "%s directory %s: %s", name, spool_directory, strerror(errno));
186 smtp_closedown(US"spool or log directory problem");
187 exim_exit(EXIT_FAILURE);
190 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
192 /* Disks are getting huge. Take care with computing the size in kilobytes. */
194 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
196 /* Unable to find partition sizes in this environment. */
207 /*************************************************
208 * Check space on spool and log partitions *
209 *************************************************/
211 /* This function is called before accepting a message; if any thresholds are
212 set, it checks them. If a message_size is supplied, it checks that there is
213 enough space for that size plus the threshold - i.e. that the message won't
214 reduce the space to the threshold. Not all OS have statvfs(); for those that
215 don't, this function always returns TRUE. For some OS the old function and
216 struct name statfs is used; that is handled by a macro, defined in exim.h.
219 msg_size the (estimated) size of an incoming message
221 Returns: FALSE if there isn't enough space, or if the information cannot
223 TRUE if no check was done or there is enough space
227 receive_check_fs(int msg_size)
231 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
233 space = receive_statvfs(TRUE, &inodes);
236 debug_printf("spool directory space = %dK inodes = %d "
237 "check_space = %dK inodes = %d msg_size = %d\n",
238 space, inodes, check_spool_space, check_spool_inodes, msg_size);
240 if ((space >= 0 && space < check_spool_space) ||
241 (inodes >= 0 && inodes < check_spool_inodes))
243 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
244 "inodes=%d", space, inodes);
249 if (check_log_space > 0 || check_log_inodes > 0)
251 space = receive_statvfs(FALSE, &inodes);
254 debug_printf("log directory space = %dK inodes = %d "
255 "check_space = %dK inodes = %d\n",
256 space, inodes, check_log_space, check_log_inodes);
258 if ((space >= 0 && space < check_log_space) ||
259 (inodes >= 0 && inodes < check_log_inodes))
261 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
262 "inodes=%d", space, inodes);
272 /*************************************************
273 * Bomb out while reading a message *
274 *************************************************/
276 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
277 received, or if there is a timeout. A rarer case might be if the log files are
278 screwed up and Exim can't open them to record a message's arrival. Handling
279 that case is done by setting a flag to cause the log functions to call this
280 function if there is an ultimate disaster. That is why it is globally
284 reason text reason to pass to the not-quit ACL
285 msg default SMTP response to give if in an SMTP session
290 receive_bomb_out(uschar *reason, uschar *msg)
292 static BOOL already_bombing_out;
293 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
294 timeouts, if someone has something slow in their quit ACL. Since the only
295 things we should be doing are to close down cleanly ASAP, on the second
296 pass we also close down stuff that might be opened again, before bypassing
297 the ACL call and exiting. */
299 /* If spool_name is set, it contains the name of the data file that is being
300 written. Unlink it before closing so that it cannot be picked up by a delivery
301 process. Ensure that any header file is also removed. */
303 if (spool_name[0] != '\0')
306 spool_name[Ustrlen(spool_name) - 1] = 'H';
308 spool_name[0] = '\0';
311 /* Now close the file if it is open, either as a fd or a stream. */
313 if (data_file != NULL)
315 (void)fclose(data_file);
317 } else if (data_fd >= 0) {
318 (void)close(data_fd);
322 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
323 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
326 if (!already_bombing_out)
328 already_bombing_out = TRUE;
331 if (smtp_batched_input)
332 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
333 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
334 smtp_active_hostname, msg);
338 /* Exit from the program (non-BSMTP cases) */
340 exim_exit(EXIT_FAILURE);
344 /*************************************************
345 * Data read timeout *
346 *************************************************/
348 /* Handler function for timeouts that occur while reading the data that
351 Argument: the signal number
356 data_timeout_handler(int sig)
360 sig = sig; /* Keep picky compilers happy */
364 msg = US"SMTP incoming data timeout";
365 log_write(L_lost_incoming_connection,
366 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
368 (sender_fullhost != NULL)? sender_fullhost : US"local process",
373 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
374 log_write(L_lost_incoming_connection,
375 LOG_MAIN, "timed out while reading local message");
378 receive_bomb_out(US"data-timeout", msg); /* Does not return */
383 /*************************************************
384 * local_scan() timeout *
385 *************************************************/
387 /* Handler function for timeouts that occur while running a local_scan()
390 Argument: the signal number
395 local_scan_timeout_handler(int sig)
397 sig = sig; /* Keep picky compilers happy */
398 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
399 "message temporarily rejected (size %d)", message_size);
400 /* Does not return */
401 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
406 /*************************************************
407 * local_scan() crashed *
408 *************************************************/
410 /* Handler function for signals that occur while running a local_scan()
413 Argument: the signal number
418 local_scan_crash_handler(int sig)
420 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
421 "signal %d - message temporarily rejected (size %d)", sig, message_size);
422 /* Does not return */
423 receive_bomb_out(US"local-scan-error", US"local verification problem");
427 /*************************************************
428 * SIGTERM or SIGINT received *
429 *************************************************/
431 /* Handler for SIGTERM or SIGINT signals that occur while reading the
432 data that comprises a message.
434 Argument: the signal number
439 data_sigterm_sigint_handler(int sig)
445 msg = US"Service not available - SIGTERM or SIGINT received";
446 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
447 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
451 if (filter_test == FTEST_NONE)
453 fprintf(stderr, "\nexim: %s received - message abandoned\n",
454 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
455 log_write(0, LOG_MAIN, "%s received while reading local message",
456 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
460 receive_bomb_out(US"signal-exit", msg); /* Does not return */
465 /*************************************************
466 * Add new recipient to list *
467 *************************************************/
469 /* This function builds a list of recipient addresses in argc/argv
473 recipient the next address to add to recipients_list
474 pno parent number for fixed aliases; -1 otherwise
480 receive_add_recipient(uschar *recipient, int pno)
482 if (recipients_count >= recipients_list_max)
484 recipient_item *oldlist = recipients_list;
485 int oldmax = recipients_list_max;
486 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
487 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
489 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
492 recipients_list[recipients_count].address = recipient;
493 recipients_list[recipients_count].pno = pno;
494 #ifdef EXPERIMENTAL_BRIGHTMAIL
495 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
496 /* reset optin string pointer for next recipient */
497 bmi_current_optin = NULL;
499 recipients_list[recipients_count].orcpt = NULL;
500 recipients_list[recipients_count].dsn_flags = 0;
501 recipients_list[recipients_count++].errors_to = NULL;
507 /*************************************************
508 * Send user response message *
509 *************************************************/
511 /* This function is passed a default response code and a user message. It calls
512 smtp_message_code() to check and possibly modify the response code, and then
513 calls smtp_respond() to transmit the response. I put this into a function
514 just to avoid a lot of repetition.
517 code the response code
518 user_msg the user message
525 smtp_user_msg(uschar *code, uschar *user_msg)
528 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
529 smtp_respond(code, len, TRUE, user_msg);
537 /*************************************************
538 * Remove a recipient from the list *
539 *************************************************/
541 /* This function is provided for local_scan() to use.
544 recipient address to remove
546 Returns: TRUE if it did remove something; FALSE otherwise
550 receive_remove_recipient(uschar *recipient)
553 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
555 for (count = 0; count < recipients_count; count++)
557 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
559 if ((--recipients_count - count) > 0)
560 memmove(recipients_list + count, recipients_list + count + 1,
561 (recipients_count - count)*sizeof(recipient_item));
572 /*************************************************
573 * Read data portion of a non-SMTP message *
574 *************************************************/
576 /* This function is called to read the remainder of a message (following the
577 header) when the input is not from SMTP - we are receiving a local message on
578 a standard input stream. The message is always terminated by EOF, and is also
579 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
580 two cases for maximum efficiency.
582 Ensure that the body ends with a newline. This will naturally be the case when
583 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
584 as "sequences of lines" - this of course strictly applies only to SMTP, but
585 deliveries into BSD-type mailbox files also require it. Exim used to have a
586 flag for doing this at delivery time, but as it was always set for all
587 transports, I decided to simplify things by putting the check here instead.
589 There is at least one MUA (dtmail) that sends CRLF via this interface, and
590 other programs are known to do this as well. Exim used to have a option for
591 dealing with this: in July 2003, after much discussion, the code has been
592 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
594 However, for the case when a dot on a line by itself terminates a message, the
595 only recognized terminating sequences before and after the dot are LF and CRLF.
596 Otherwise, having read EOL . CR, you don't know whether to read another
599 Internally, in messages stored in Exim's spool files, LF is used as the line
600 terminator. Under the new regime, bare CRs will no longer appear in these
604 fout a FILE to which to write the message
606 Returns: One of the END_xxx values indicating why it stopped reading
610 read_message_data(FILE *fout)
614 register int linelength = 0;
616 /* Handle the case when only EOF terminates the message */
620 register int last_ch = '\n';
622 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
624 if (ch == 0) body_zerocount++;
625 if (last_ch == '\r' && ch != '\n')
627 if (linelength > max_received_linelength)
628 max_received_linelength = linelength;
630 if (fputc('\n', fout) == EOF) return END_WERROR;
634 if (ch == '\r') continue;
636 if (fputc(ch, fout) == EOF) return END_WERROR;
639 if (linelength > max_received_linelength)
640 max_received_linelength = linelength;
645 if (++message_size > thismessage_size_limit) return END_SIZE;
650 if (linelength > max_received_linelength)
651 max_received_linelength = linelength;
652 if (fputc('\n', fout) == EOF) return END_WERROR;
660 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
664 while ((ch = (receive_getc)()) != EOF)
666 if (ch == 0) body_zerocount++;
669 case 0: /* Normal state (previous char written) */
673 if (linelength > max_received_linelength)
674 max_received_linelength = linelength;
679 { ch_state = 2; continue; }
682 case 1: /* After written "\n" */
683 if (ch == '.') { ch_state = 3; continue; }
684 if (ch == '\r') { ch_state = 2; continue; }
685 if (ch != '\n') ch_state = 0; else linelength = -1;
689 body_linecount++; /* After unwritten "\r" */
690 if (linelength > max_received_linelength)
691 max_received_linelength = linelength;
699 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
700 if (ch == '\r') continue;
706 case 3: /* After "\n." (\n written, dot not) */
707 if (ch == '\n') return END_DOT;
708 if (ch == '\r') { ch_state = 4; continue; }
711 if (fputc('.', fout) == EOF) return END_WERROR;
715 case 4: /* After "\n.\r" (\n written, rest not) */
716 if (ch == '\n') return END_DOT;
719 if (fputs(".\n", fout) == EOF) return END_WERROR;
720 if (ch == '\r') { ch_state = 2; continue; }
726 if (fputc(ch, fout) == EOF) return END_WERROR;
727 if (++message_size > thismessage_size_limit) return END_SIZE;
730 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
731 the message ends with a newline, and we must also write any characters that
732 were saved up while testing for an ending dot. */
736 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
737 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
738 message_size += Ustrlen(ends[ch_state]);
748 /*************************************************
749 * Read data portion of an SMTP message *
750 *************************************************/
752 /* This function is called to read the remainder of an SMTP message (after the
753 headers), or to skip over it when an error has occurred. In this case, the
754 output file is passed as NULL.
756 If any line begins with a dot, that character is skipped. The input should only
757 be successfully terminated by CR LF . CR LF unless it is local (non-network)
758 SMTP, in which case the CRs are optional, but...
760 FUDGE: It seems that sites on the net send out messages with just LF
761 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
762 we make the CRs optional in all cases.
764 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
765 well, so that there are no CRs in spooled messages. However, the message
766 terminating dot is not recognized between two bare CRs.
769 fout a FILE to which to write the message; NULL if skipping
771 Returns: One of the END_xxx values indicating why it stopped reading
773 /*XXX CHUNKING: maybe a variant routing specialised for BDAT, assuming
774 string RFC compliance ie. CRLF always? We still have to strip the CR
775 but we are not dealing with variant lunacy or looking for the end-dot */
778 read_message_data_smtp(FILE *fout)
782 register int linelength = 0;
784 while ((ch = (receive_getc)()) != EOF)
786 if (ch == 0) body_zerocount++;
789 case 0: /* After LF or CRLF */
793 continue; /* Don't ever write . after LF */
797 /* Else fall through to handle as normal uschar. */
799 case 1: /* Normal state */
804 if (linelength > max_received_linelength)
805 max_received_linelength = linelength;
815 case 2: /* After (unwritten) CR */
817 if (linelength > max_received_linelength)
818 max_received_linelength = linelength;
827 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
828 (void) cutthrough_put_nl();
829 if (ch != '\r') ch_state = 1; else continue;
833 case 3: /* After [CR] LF . */
841 /* The dot was removed at state 3. For a doubled dot, here, reinstate
842 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
843 and to file below. */
847 (void) cutthrough_puts(&c, 1);
852 case 4: /* After [CR] LF . CR */
853 if (ch == '\n') return END_DOT;
856 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
857 (void) cutthrough_put_nl();
867 /* Add the character to the spool file, unless skipping; then loop for the
874 if (fputc(ch, fout) == EOF) return END_WERROR;
875 if (message_size > thismessage_size_limit) return END_SIZE;
878 (void) cutthrough_put_nl();
882 (void) cutthrough_puts(&c, 1);
886 /* Fall through here if EOF encountered. This indicates some kind of error,
887 since a correct message is terminated by [CR] LF . [CR] LF. */
895 /*************************************************
896 * Swallow SMTP message *
897 *************************************************/
899 /* This function is called when there has been some kind of error while reading
900 an SMTP message, and the remaining data may need to be swallowed. It is global
901 because it is called from smtp_closedown() to shut down an incoming call
904 Argument: a FILE from which to read the message
909 receive_swallow_smtp(void)
911 if (message_ended >= END_NOTENDED)
912 message_ended = read_message_data_smtp(NULL);
917 /*************************************************
918 * Handle lost SMTP connection *
919 *************************************************/
921 /* This function logs connection loss incidents and generates an appropriate
924 Argument: additional data for the message
925 Returns: the SMTP response
929 handle_lost_connection(uschar *s)
931 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
932 "%s lost while reading message data%s", smtp_get_connection_info(), s);
933 return US"421 Lost incoming connection";
939 /*************************************************
940 * Handle a non-smtp reception error *
941 *************************************************/
943 /* This function is called for various errors during the reception of non-SMTP
944 messages. It either sends a message to the sender of the problem message, or it
945 writes to the standard error stream.
948 errcode code for moan_to_sender(), identifying the error
949 text1 first message text, passed to moan_to_sender()
950 text2 second message text, used only for stderrr
951 error_rc code to pass to exim_exit if no problem
952 f FILE containing body of message (may be stdin)
953 hptr pointer to instore headers or NULL
955 Returns: calls exim_exit(), which does not return
959 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
960 FILE *f, header_line *hptr)
962 if (error_handling == ERRORS_SENDER)
966 eblock.text1 = text1;
968 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
969 error_rc = EXIT_FAILURE;
972 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
979 /*************************************************
980 * Add header lines set up by ACL *
981 *************************************************/
983 /* This function is called to add the header lines that were set up by
984 statements in an ACL to the list of headers in memory. It is done in two stages
985 like this, because when the ACL for RCPT is running, the other headers have not
986 yet been received. This function is called twice; once just before running the
987 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
988 are visible to the DATA ACL.
990 Originally these header lines were added at the end. Now there is support for
991 three different places: top, bottom, and after the Received: header(s). There
992 will always be at least one Received: header, even if it is marked deleted, and
993 even if something else has been put in front of it.
996 acl_name text to identify which ACL
1002 add_acl_headers(int where, uschar *acl_name)
1004 header_line *h, *next;
1005 header_line *last_received = NULL;
1009 case ACL_WHERE_DKIM:
1010 case ACL_WHERE_MIME:
1011 case ACL_WHERE_DATA:
1012 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1014 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1015 " will not take effect on cutthrough deliveries");
1020 if (acl_removed_headers != NULL)
1022 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1024 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1026 const uschar * list = acl_removed_headers;
1027 int sep = ':'; /* This is specified as a colon-separated list */
1031 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1032 if (header_testname(h, s, Ustrlen(s), FALSE))
1034 h->type = htype_old;
1035 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1038 acl_removed_headers = NULL;
1039 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1042 if (acl_added_headers == NULL) return;
1043 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1045 for (h = acl_added_headers; h != NULL; h = next)
1052 h->next = header_list;
1054 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1058 if (last_received == NULL)
1060 last_received = header_list;
1061 while (!header_testname(last_received, US"Received", 8, FALSE))
1062 last_received = last_received->next;
1063 while (last_received->next != NULL &&
1064 header_testname(last_received->next, US"Received", 8, FALSE))
1065 last_received = last_received->next;
1067 h->next = last_received->next;
1068 last_received->next = h;
1069 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1073 /* add header before any header which is NOT Received: or Resent- */
1074 last_received = header_list;
1075 while ( (last_received->next != NULL) &&
1076 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1077 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1078 last_received = last_received->next;
1079 /* last_received now points to the last Received: or Resent-* header
1080 in an uninterrupted chain of those header types (seen from the beginning
1081 of all headers. Our current header must follow it. */
1082 h->next = last_received->next;
1083 last_received->next = h;
1084 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1089 header_last->next = h;
1093 if (h->next == NULL) header_last = h;
1095 /* Check for one of the known header types (From:, To:, etc.) though in
1096 practice most added headers are going to be "other". Lower case
1097 identification letters are never stored with the header; they are used
1098 for existence tests when messages are received. So discard any lower case
1101 h->type = header_checkname(h, FALSE);
1102 if (h->type >= 'a') h->type = htype_other;
1104 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1107 acl_added_headers = NULL;
1108 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1113 /*************************************************
1114 * Add host information for log line *
1115 *************************************************/
1117 /* Called for acceptance and rejecting log lines. This adds information about
1118 the calling host to a string that is being built dynamically.
1121 s the dynamic string
1122 sizeptr points to the size variable
1123 ptrptr points to the pointer variable
1125 Returns: the extended string
1129 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1131 if (sender_fullhost)
1133 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1134 s = string_cat(s, sizeptr, ptrptr, US" DS");
1135 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1136 if (LOGGING(incoming_interface) && interface_address != NULL)
1138 s = string_cat(s, sizeptr, ptrptr,
1139 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1142 if (sender_ident != NULL)
1143 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1144 if (received_protocol != NULL)
1145 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1151 #ifdef WITH_CONTENT_SCAN
1153 /*************************************************
1154 * Run the MIME ACL on a message *
1155 *************************************************/
1157 /* This code is in a subroutine so that it can be used for both SMTP
1158 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1161 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1162 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1163 smtp_reply_ptr Where SMTP reply is being built
1164 blackholed_by_ptr Where "blackholed by" message is being built
1166 Returns: TRUE to carry on; FALSE to abandon the message
1170 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1171 uschar **blackholed_by_ptr)
1174 uschar rfc822_file_path[2048];
1175 unsigned long mbox_size;
1176 header_line *my_headerlist;
1177 uschar *user_msg, *log_msg;
1178 int mime_part_count_buffer = -1;
1181 memset(CS rfc822_file_path,0,2048);
1183 /* check if it is a MIME message */
1184 my_headerlist = header_list;
1185 while (my_headerlist != NULL)
1187 /* skip deleted headers */
1188 if (my_headerlist->type == '*')
1190 my_headerlist = my_headerlist->next;
1193 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1195 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1198 my_headerlist = my_headerlist->next;
1201 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1205 /* make sure the eml mbox file is spooled up */
1206 mbox_file = spool_mbox(&mbox_size, NULL);
1207 if (mbox_file == NULL) {
1208 /* error while spooling */
1209 log_write(0, LOG_MAIN|LOG_PANIC,
1210 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1211 Uunlink(spool_name);
1213 #ifdef EXPERIMENTAL_DCC
1216 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1217 message_id[0] = 0; /* Indicate no message accepted */
1218 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1219 return FALSE; /* Indicate skip to end of receive function */
1225 mime_part_count = -1;
1226 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1227 (void)fclose(mbox_file);
1229 if (Ustrlen(rfc822_file_path) > 0)
1231 mime_part_count = mime_part_count_buffer;
1233 if (unlink(CS rfc822_file_path) == -1)
1235 log_write(0, LOG_PANIC,
1236 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1241 /* check if we must check any message/rfc822 attachments */
1244 uschar temp_path[1024];
1245 struct dirent * entry;
1248 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1249 spool_directory, message_id);
1251 tempdir = opendir(CS temp_path);
1254 if (!(entry = readdir(tempdir)))
1256 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1258 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1259 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1260 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1269 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1271 /* set RFC822 expansion variable */
1273 mime_part_count_buffer = mime_part_count;
1274 goto MIME_ACL_CHECK;
1276 log_write(0, LOG_PANIC,
1277 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1278 unlink(CS rfc822_file_path);
1283 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1286 recipients_count = 0;
1287 *blackholed_by_ptr = US"MIME ACL";
1291 Uunlink(spool_name);
1293 #ifdef EXPERIMENTAL_DCC
1297 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1299 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1300 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1302 message_id[0] = 0; /* Indicate no message accepted */
1303 return FALSE; /* Cause skip to end of receive function */
1309 #endif /* WITH_CONTENT_SCAN */
1314 received_header_gen(void)
1318 header_line *received_header= header_list;
1320 timestamp = expand_string(US"${tod_full}");
1321 if (recipients_count == 1) received_for = recipients_list[0].address;
1322 received = expand_string(received_header_text);
1323 received_for = NULL;
1327 if(spool_name[0] != 0)
1328 Uunlink(spool_name); /* Lose the data file */
1329 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1330 "(received_header_text) failed: %s", string_printing(received_header_text),
1331 expand_string_message);
1334 /* The first element on the header chain is reserved for the Received header,
1335 so all we have to do is fill in the text pointer, and set the type. However, if
1336 the result of the expansion is an empty string, we leave the header marked as
1337 "old" so as to refrain from adding a Received header. */
1339 if (received[0] == 0)
1341 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1342 received_header->type = htype_old;
1346 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1347 received_header->type = htype_received;
1350 received_header->slen = Ustrlen(received_header->text);
1352 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1353 received_header->type, received_header->text);
1358 /*************************************************
1360 *************************************************/
1362 /* Receive a message on the given input, and put it into a pair of spool files.
1363 Either a non-null list of recipients, or the extract flag will be true, or
1364 both. The flag sender_local is true for locally generated messages. The flag
1365 submission_mode is true if an ACL has obeyed "control = submission". The flag
1366 suppress_local_fixups is true if an ACL has obeyed "control =
1367 suppress_local_fixups" or -G was passed on the command-line.
1368 The flag smtp_input is true if the message is to be
1369 handled using SMTP conventions about termination and lines starting with dots.
1370 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1372 If a message was successfully read, message_id[0] will be non-zero.
1374 The general actions of this function are:
1376 . Read the headers of the message (if any) into a chain of store
1379 . If there is a "sender:" header and the message is locally originated,
1380 throw it away, unless the caller is trusted, or unless
1381 active_local_sender_retain is set - which can only happen if
1382 active_local_from_check is false.
1384 . If recipients are to be extracted from the message, build the
1385 recipients list from the headers, removing any that were on the
1386 original recipients list (unless extract_addresses_remove_arguments is
1387 false), and at the same time, remove any bcc header that may be present.
1389 . Get the spool file for the data, sort out its unique name, open
1390 and lock it (but don't give it the name yet).
1392 . Generate a "Message-Id" header if the message doesn't have one, for
1393 locally-originated messages.
1395 . Generate a "Received" header.
1397 . Ensure the recipients list is fully qualified and rewritten if necessary.
1399 . If there are any rewriting rules, apply them to the sender address
1400 and also to the headers.
1402 . If there is no from: header, generate one, for locally-generated messages
1403 and messages in "submission mode" only.
1405 . If the sender is local, check that from: is correct, and if not, generate
1406 a Sender: header, unless message comes from a trusted caller, or this
1407 feature is disabled by active_local_from_check being false.
1409 . If there is no "date" header, generate one, for locally-originated
1410 or submission mode messages only.
1412 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1413 dot_ends mode, to the data file. Leave it open, to hold the lock.
1415 . Write the envelope and the headers to a new file.
1417 . Set the name for the header file; close it.
1419 . Set the name for the data file; close it.
1421 Because this function can potentially be called many times in a single
1422 SMTP connection, all store should be got by store_get(), so that it will be
1423 automatically retrieved after the message is accepted.
1425 FUDGE: It seems that sites on the net send out messages with just LF
1426 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1427 we make the CRs optional in all cases.
1429 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1430 new regime is now in place in which bare CRs in header lines are turned into LF
1431 followed by a space, so as not to terminate the header line.
1433 February 2004: A bare LF in a header line in a message whose first line was
1434 terminated by CRLF is treated in the same way as a bare CR.
1437 extract_recip TRUE if recipients are to be extracted from the message's
1440 Returns: TRUE there are more messages to be read (SMTP input)
1441 FALSE there are no more messages to be read (non-SMTP input
1442 or SMTP connection collapsed, or other failure)
1444 When reading a message for filter testing, the returned value indicates
1445 whether the headers (which is all that is read) were terminated by '.' or
1449 receive_msg(BOOL extract_recip)
1454 int process_info_len = Ustrlen(process_info);
1455 int error_rc = (error_handling == ERRORS_SENDER)?
1456 errors_sender_rc : EXIT_FAILURE;
1457 int header_size = 256;
1458 int start, end, domain, size, sptr;
1461 int prevlines_length = 0;
1463 register int ptr = 0;
1465 BOOL contains_resent_headers = FALSE;
1466 BOOL extracted_ignored = FALSE;
1467 BOOL first_line_ended_crlf = TRUE_UNSET;
1468 BOOL smtp_yield = TRUE;
1471 BOOL resents_exist = FALSE;
1472 uschar *resent_prefix = US"";
1473 uschar *blackholed_by = NULL;
1474 uschar *blackhole_log_msg = US"";
1475 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1478 error_block *bad_addresses = NULL;
1480 uschar *frozen_by = NULL;
1481 uschar *queued_by = NULL;
1484 struct stat statbuf;
1486 /* Final message to give to SMTP caller, and messages from ACLs */
1488 uschar *smtp_reply = NULL;
1489 uschar *user_msg, *log_msg;
1491 /* Working header pointers */
1493 header_line *h, *next;
1495 /* Flags for noting the existence of certain headers (only one left) */
1497 BOOL date_header_exists = FALSE;
1499 /* Pointers to receive the addresses of headers whose contents we need. */
1501 header_line *from_header = NULL;
1502 header_line *subject_header = NULL;
1503 header_line *msgid_header = NULL;
1504 header_line *received_header;
1506 #ifdef EXPERIMENTAL_DMARC
1508 #endif /* EXPERIMENTAL_DMARC */
1510 /* Variables for use when building the Received: header. */
1515 /* Release any open files that might have been cached while preparing to
1516 accept the message - e.g. by verifying addresses - because reading a message
1517 might take a fair bit of real time. */
1521 /* Extracting the recipient list from an input file is incompatible with
1522 cutthrough delivery with the no-spool option. It shouldn't be possible
1523 to set up the combination, but just in case kill any ongoing connection. */
1524 if (extract_recip || !smtp_input)
1525 cancel_cutthrough_connection("not smtp input");
1527 /* Initialize the chain of headers by setting up a place-holder for Received:
1528 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1529 pointing to the end of the chain to make adding headers simple. */
1531 received_header = header_list = header_last = store_get(sizeof(header_line));
1532 header_list->next = NULL;
1533 header_list->type = htype_old;
1534 header_list->text = NULL;
1535 header_list->slen = 0;
1537 /* Control block for the next header to be read. */
1539 next = store_get(sizeof(header_line));
1540 next->text = store_get(header_size);
1542 /* Initialize message id to be null (indicating no message read), and the
1543 header names list to be the normal list. Indicate there is no data file open
1544 yet, initialize the size and warning count, and deal with no size limit. */
1552 received_count = 1; /* For the one we will add */
1554 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1556 /* While reading the message, the following counts are computed. */
1558 message_linecount = body_linecount = body_zerocount =
1559 max_received_linelength = 0;
1561 #ifndef DISABLE_DKIM
1562 /* Call into DKIM to set up the context. */
1563 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1566 #ifdef EXPERIMENTAL_DMARC
1567 /* initialize libopendmarc */
1568 dmarc_up = dmarc_init();
1571 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1572 ids, and fractions of a second are required. See the comments that precede the
1573 message id creation below. */
1575 (void)gettimeofday(&message_id_tv, NULL);
1577 /* For other uses of the received time we can operate with granularity of one
1578 second, and for that we use the global variable received_time. This is for
1579 things like ultimate message timeouts. */
1581 received_time = message_id_tv.tv_sec;
1583 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1584 happen in the smtp_getc() function when it refills its buffer. */
1586 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1588 /* If not SMTP input, timeout happens only if configured, and we just set a
1589 single timeout for the whole message. */
1591 else if (receive_timeout > 0)
1593 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1594 alarm(receive_timeout);
1597 /* SIGTERM and SIGINT are caught always. */
1599 signal(SIGTERM, data_sigterm_sigint_handler);
1600 signal(SIGINT, data_sigterm_sigint_handler);
1602 /* Header lines in messages are not supposed to be very long, though when
1603 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1604 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1605 storing the header, and extend this as necessary using string_cat().
1607 To cope with total lunacies, impose an upper limit on the length of the header
1608 section of the message, as otherwise the store will fill up. We must also cope
1609 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1610 Folded header lines are joined into one string, leaving the '\n' characters
1611 inside them, so that writing them out reproduces the input.
1613 Loop for each character of each header; the next structure for chaining the
1614 header is set up already, with ptr the offset of the next character in
1619 /*XXX CHUNKING: account for BDAT size & last, and do more chunks as needed */
1620 int ch = (receive_getc)();
1622 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1623 SMTP must have a correct "." terminator. */
1625 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1627 smtp_reply = handle_lost_connection(US" (header)");
1629 goto TIDYUP; /* Skip to end of function */
1632 /* See if we are at the current header's size limit - there must be at least
1633 four bytes left. This allows for the new character plus a zero, plus two for
1634 extra insertions when we are playing games with dots and carriage returns. If
1635 we are at the limit, extend the text buffer. This could have been done
1636 automatically using string_cat() but because this is a tightish loop storing
1637 only one character at a time, we choose to do it inline. Normally
1638 store_extend() will be able to extend the block; only at the end of a big
1639 store block will a copy be needed. To handle the case of very long headers
1640 (and sometimes lunatic messages can have ones that are 100s of K long) we
1641 call store_release() for strings that have been copied - if the string is at
1642 the start of a block (and therefore the only thing in it, because we aren't
1643 doing any other gets), the block gets freed. We can only do this because we
1644 know there are no other calls to store_get() going on. */
1646 if (ptr >= header_size - 4)
1648 int oldsize = header_size;
1649 /* header_size += 256; */
1651 if (!store_extend(next->text, oldsize, header_size))
1653 uschar *newtext = store_get(header_size);
1654 memcpy(newtext, next->text, ptr);
1655 store_release(next->text);
1656 next->text = newtext;
1660 /* Cope with receiving a binary zero. There is dispute about whether
1661 these should be allowed in RFC 822 messages. The middle view is that they
1662 should not be allowed in headers, at least. Exim takes this attitude at
1663 the moment. We can't just stomp on them here, because we don't know that
1664 this line is a header yet. Set a flag to cause scanning later. */
1666 if (ch == 0) had_zero++;
1668 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1669 those from data files use just LF. Treat LF in local SMTP input as a
1670 terminator too. Treat EOF as a line terminator always. */
1672 if (ch == EOF) goto EOL;
1674 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1675 other MTAs accept this. We are therefore forced into this "liberalisation"
1676 too, so we accept LF as a line terminator whatever the source of the message.
1677 However, if the first line of the message ended with a CRLF, we treat a bare
1678 LF specially by inserting a white space after it to ensure that the header
1679 line is not terminated. */
1683 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1684 else if (first_line_ended_crlf) receive_ungetc(' ');
1688 /* This is not the end of the line. If this is SMTP input and this is
1689 the first character in the line and it is a "." character, ignore it.
1690 This implements the dot-doubling rule, though header lines starting with
1691 dots aren't exactly common. They are legal in RFC 822, though. If the
1692 following is CRLF or LF, this is the line that that terminates the
1693 entire message. We set message_ended to indicate this has happened (to
1694 prevent further reading), and break out of the loop, having freed the
1695 empty header, and set next = NULL to indicate no data line. */
1697 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1699 ch = (receive_getc)();
1702 ch = (receive_getc)();
1706 ch = '\r'; /* Revert to CR */
1711 message_ended = END_DOT;
1714 break; /* End character-reading loop */
1717 /* For non-SMTP input, the dot at the start of the line was really a data
1718 character. What is now in ch is the following character. We guaranteed
1719 enough space for this above. */
1723 next->text[ptr++] = '.';
1728 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1729 remember this case if this is the first line ending. */
1733 ch = (receive_getc)();
1736 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1740 /* Otherwise, put back the character after CR, and turn the bare CR
1743 ch = (receive_ungetc)(ch);
1744 next->text[ptr++] = '\n';
1749 /* We have a data character for the header line. */
1751 next->text[ptr++] = ch; /* Add to buffer */
1752 message_size++; /* Total message size so far */
1754 /* Handle failure due to a humungously long header section. The >= allows
1755 for the terminating \n. Add what we have so far onto the headers list so
1756 that it gets reflected in any error message, and back up the just-read
1759 if (message_size >= header_maxsize)
1761 next->text[ptr] = 0;
1763 next->type = htype_other;
1765 header_last->next = next;
1768 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1769 "%s (more than %d characters): message abandoned",
1770 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1774 smtp_reply = US"552 Message header is ridiculously long";
1775 receive_swallow_smtp();
1776 goto TIDYUP; /* Skip to end of function */
1781 give_local_error(ERRMESS_VLONGHEADER,
1782 string_sprintf("message header longer than %d characters received: "
1783 "message not accepted", header_maxsize), US"", error_rc, stdin,
1785 /* Does not return */
1789 continue; /* With next input character */
1791 /* End of header line reached */
1795 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1797 receive_linecount++;
1798 message_linecount++;
1800 /* Keep track of maximum line length */
1802 if (ptr - prevlines_length > max_received_linelength)
1803 max_received_linelength = ptr - prevlines_length;
1804 prevlines_length = ptr + 1;
1806 /* Now put in the terminating newline. There is always space for
1807 at least two more characters. */
1809 next->text[ptr++] = '\n';
1812 /* A blank line signals the end of the headers; release the unwanted
1813 space and set next to NULL to indicate this. */
1822 /* There is data in the line; see if the next input character is a
1823 whitespace character. If it is, we have a continuation of this header line.
1824 There is always space for at least one character at this point. */
1828 int nextch = (receive_getc)();
1829 if (nextch == ' ' || nextch == '\t')
1831 next->text[ptr++] = nextch;
1833 continue; /* Iterate the loop */
1835 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1836 else ch = EOF; /* Cause main loop to exit at end */
1839 /* We have got to the real line end. Terminate the string and release store
1840 beyond it. If it turns out to be a real header, internal binary zeros will
1841 be squashed later. */
1843 next->text[ptr] = 0;
1845 store_reset(next->text + ptr + 1);
1847 /* Check the running total size against the overall message size limit. We
1848 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1849 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1850 headers - the code to read the body will then also hit the buffer. */
1852 if (message_size > thismessage_size_limit) break;
1854 /* A line that is not syntactically correct for a header also marks
1855 the end of the headers. In this case, we leave next containing the
1856 first data line. This might actually be several lines because of the
1857 continuation logic applied above, but that doesn't matter.
1859 It turns out that smail, and presumably sendmail, accept leading lines
1862 From ph10 Fri Jan 5 12:35 GMT 1996
1864 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1865 find any documentation of this, but for compatibility it had better be
1866 accepted. Exim restricts it to the case of non-smtp messages, and
1867 treats it as an alternative to the -f command line option. Thus it is
1868 ignored except for trusted users or filter testing. Otherwise it is taken
1869 as the sender address, unless -f was used (sendmail compatibility).
1871 It further turns out that some UUCPs generate the From_line in a different
1874 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1876 The regex for matching these things is now capable of recognizing both
1877 formats (including 2- and 4-digit years in the latter). In fact, the regex
1878 is now configurable, as is the expansion string to fish out the sender.
1880 Even further on it has been discovered that some broken clients send
1881 these lines in SMTP messages. There is now an option to ignore them from
1882 specified hosts or networks. Sigh. */
1884 if (header_last == header_list &&
1887 (sender_host_address != NULL &&
1888 verify_check_host(&ignore_fromline_hosts) == OK)
1890 (sender_host_address == NULL && ignore_fromline_local)
1892 regex_match_and_setup(regex_From, next->text, 0, -1))
1894 if (!sender_address_forced)
1896 uschar *uucp_sender = expand_string(uucp_from_sender);
1897 if (uucp_sender == NULL)
1899 log_write(0, LOG_MAIN|LOG_PANIC,
1900 "expansion of \"%s\" failed after matching "
1901 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1905 int start, end, domain;
1907 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1908 &start, &end, &domain, TRUE);
1909 if (newsender != NULL)
1911 if (domain == 0 && newsender[0] != 0)
1912 newsender = rewrite_address_qualify(newsender, FALSE);
1914 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1916 sender_address = newsender;
1918 if (trusted_caller || filter_test != FTEST_NONE)
1920 authenticated_sender = NULL;
1921 originator_name = US"";
1922 sender_local = FALSE;
1925 if (filter_test != FTEST_NONE)
1926 printf("Sender taken from \"From \" line\n");
1933 /* Not a leading "From " line. Check to see if it is a valid header line.
1934 Header names may contain any non-control characters except space and colon,
1939 uschar *p = next->text;
1941 /* If not a valid header line, break from the header reading loop, leaving
1942 next != NULL, indicating that it holds the first line of the body. */
1944 if (isspace(*p)) break;
1945 while (mac_isgraph(*p) && *p != ':') p++;
1946 while (isspace(*p)) p++;
1949 body_zerocount = had_zero;
1953 /* We have a valid header line. If there were any binary zeroes in
1954 the line, stomp on them here. */
1957 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1959 /* It is perfectly legal to have an empty continuation line
1960 at the end of a header, but it is confusing to humans
1961 looking at such messages, since it looks like a blank line.
1962 Reduce confusion by removing redundant white space at the
1963 end. We know that there is at least one printing character
1964 (the ':' tested for above) so there is no danger of running
1967 p = next->text + ptr - 2;
1970 while (*p == ' ' || *p == '\t') p--;
1971 if (*p != '\n') break;
1972 ptr = (p--) - next->text + 1;
1973 message_size -= next->slen - ptr;
1974 next->text[ptr] = 0;
1978 /* Add the header to the chain */
1980 next->type = htype_other;
1982 header_last->next = next;
1985 /* Check the limit for individual line lengths. This comes after adding to
1986 the chain so that the failing line is reflected if a bounce is generated
1987 (for a local message). */
1989 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1991 log_write(0, LOG_MAIN, "overlong message header line received from "
1992 "%s (more than %d characters): message abandoned",
1993 sender_host_unknown? sender_ident : sender_fullhost,
1994 header_line_maxsize);
1998 smtp_reply = US"552 A message header line is too long";
1999 receive_swallow_smtp();
2000 goto TIDYUP; /* Skip to end of function */
2005 give_local_error(ERRMESS_VLONGHDRLINE,
2006 string_sprintf("message header line longer than %d characters "
2007 "received: message not accepted", header_line_maxsize), US"",
2008 error_rc, stdin, header_list->next);
2009 /* Does not return */
2013 /* Note if any resent- fields exist. */
2015 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2017 resents_exist = TRUE;
2018 resent_prefix = US"Resent-";
2022 /* The line has been handled. If we have hit EOF, break out of the loop,
2023 indicating no pending data line. */
2025 if (ch == EOF) { next = NULL; break; }
2027 /* Set up for the next header */
2030 next = store_get(sizeof(header_line));
2031 next->text = store_get(header_size);
2034 prevlines_length = 0;
2035 } /* Continue, starting to read the next header */
2037 /* At this point, we have read all the headers into a data structure in main
2038 store. The first header is still the dummy placeholder for the Received: header
2039 we are going to generate a bit later on. If next != NULL, it contains the first
2040 data line - which terminated the headers before reaching a blank line (not the
2045 debug_printf(">>Headers received:\n");
2046 for (h = header_list->next; h != NULL; h = h->next)
2047 debug_printf("%s", h->text);
2051 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2052 is dropped immediately after valid headers, the next thing we will see is EOF.
2053 We must test for this specially, as further down the reading of the data is
2054 skipped if already at EOF. */
2056 if (smtp_input && (receive_feof)())
2058 smtp_reply = handle_lost_connection(US" (after header)");
2060 goto TIDYUP; /* Skip to end of function */
2063 /* If this is a filter test run and no headers were read, output a warning
2064 in case there is a mistake in the test message. */
2066 if (filter_test != FTEST_NONE && header_list->next == NULL)
2067 printf("Warning: no message headers read\n");
2070 /* Scan the headers to identify them. Some are merely marked for later
2071 processing; some are dealt with here. */
2073 for (h = header_list->next; h != NULL; h = h->next)
2075 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2076 if (is_resent) contains_resent_headers = TRUE;
2078 switch (header_checkname(h, is_resent))
2081 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2085 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2088 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2091 if (!resents_exist || is_resent) date_header_exists = TRUE;
2094 /* Same comments as about Return-Path: below. */
2096 case htype_delivery_date:
2097 if (delivery_date_remove) h->type = htype_old;
2100 /* Same comments as about Return-Path: below. */
2102 case htype_envelope_to:
2103 if (envelope_to_remove) h->type = htype_old;
2106 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2107 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2108 header consists of just the login id of the user who called Exim, rewrite
2109 it with the gecos field first. Apply this rule to Resent-From: if there
2110 are resent- fields. */
2113 h->type = htype_from;
2114 if (!resents_exist || is_resent)
2120 uschar *s = Ustrchr(h->text, ':') + 1;
2121 while (isspace(*s)) s++;
2122 len = h->slen - (s - h->text) - 1;
2123 if (Ustrlen(originator_login) == len &&
2124 strncmpic(s, originator_login, len) == 0)
2126 uschar *name = is_resent? US"Resent-From" : US"From";
2127 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2128 originator_login, qualify_domain_sender);
2129 from_header = header_last;
2130 h->type = htype_old;
2131 DEBUG(D_receive|D_rewrite)
2132 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2138 /* Identify the Message-id: header for generating "in-reply-to" in the
2139 autoreply transport. For incoming logging, save any resent- value. In both
2140 cases, take just the first of any multiples. */
2143 if (msgid_header == NULL && (!resents_exist || is_resent))
2150 /* Flag all Received: headers */
2152 case htype_received:
2153 h->type = htype_received;
2157 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2159 case htype_reply_to:
2160 h->type = htype_reply_to;
2163 /* The Return-path: header is supposed to be added to messages when
2164 they leave the SMTP system. We shouldn't receive messages that already
2165 contain Return-path. However, since Exim generates Return-path: on
2166 local delivery, resent messages may well contain it. We therefore
2167 provide an option (which defaults on) to remove any Return-path: headers
2168 on input. Removal actually means flagging as "old", which prevents the
2169 header being transmitted with the message. */
2171 case htype_return_path:
2172 if (return_path_remove) h->type = htype_old;
2174 /* If we are testing a mail filter file, use the value of the
2175 Return-Path: header to set up the return_path variable, which is not
2176 otherwise set. However, remove any <> that surround the address
2177 because the variable doesn't have these. */
2179 if (filter_test != FTEST_NONE)
2181 uschar *start = h->text + 12;
2182 uschar *end = start + Ustrlen(start);
2183 while (isspace(*start)) start++;
2184 while (end > start && isspace(end[-1])) end--;
2185 if (*start == '<' && end[-1] == '>')
2190 return_path = string_copyn(start, end - start);
2191 printf("Return-path taken from \"Return-path:\" header line\n");
2195 /* If there is a "Sender:" header and the message is locally originated,
2196 and from an untrusted caller and suppress_local_fixups is not set, or if we
2197 are in submission mode for a remote message, mark it "old" so that it will
2198 not be transmitted with the message, unless active_local_sender_retain is
2199 set. (This can only be true if active_local_from_check is false.) If there
2200 are any resent- headers in the message, apply this rule to Resent-Sender:
2201 instead of Sender:. Messages with multiple resent- header sets cannot be
2202 tidily handled. (For this reason, at least one MUA - Pine - turns old
2203 resent- headers into X-resent- headers when resending, leaving just one
2207 h->type = ((!active_local_sender_retain &&
2209 (sender_local && !trusted_caller && !suppress_local_fixups)
2213 (!resents_exist||is_resent))?
2214 htype_old : htype_sender;
2217 /* Remember the Subject: header for logging. There is no Resent-Subject */
2223 /* "To:" gets flagged, and the existence of a recipient header is noted,
2224 whether it's resent- or not. */
2229 to_or_cc_header_exists = TRUE;
2235 /* Extract recipients from the headers if that is required (the -t option).
2236 Note that this is documented as being done *before* any address rewriting takes
2237 place. There are two possibilities:
2239 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2240 recipients already listed are to be REMOVED from the message. Smail 3 works
2241 like this. We need to build a non-recipients tree for that list, because in
2242 subsequent processing this data is held in a tree and that's what the
2243 spool_write_header() function expects. Make sure that non-recipient addresses
2244 are fully qualified and rewritten if necessary.
2246 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2247 those in the command line arguments (and it is rumoured some other MTAs do
2248 this). Therefore, there is an option to make Exim behave this way.
2250 *** Notes on "Resent-" header lines ***
2252 The presence of resent-headers in the message makes -t horribly ambiguous.
2253 Experiments with sendmail showed that it uses recipients for all resent-
2254 headers, totally ignoring the concept of "sets of resent- headers" as described
2255 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2256 with all the addresses in one instance of each header.
2258 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2259 error for -t if there were resent- headers in the message. However, after a
2260 discussion on the mailing list, I've learned that there are MUAs that use
2261 resent- headers with -t, and also that the stuff about sets of resent- headers
2262 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2263 message with -t and resent- header lines makes sure that only *its* resent-
2264 headers are present; previous ones are often renamed as X-resent- for example.
2266 Consequently, Exim has been changed so that, if any resent- header lines are
2267 present, the recipients are taken from all of the appropriate resent- lines,
2268 and not from the ordinary To:, Cc:, etc. */
2273 error_block **bnext = &bad_addresses;
2275 if (extract_addresses_remove_arguments)
2277 while (recipients_count-- > 0)
2279 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2280 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2281 tree_add_nonrecipient(s);
2283 recipients_list = NULL;
2284 recipients_count = recipients_list_max = 0;
2287 /* Now scan the headers */
2289 for (h = header_list->next; h != NULL; h = h->next)
2291 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2292 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2294 uschar *s = Ustrchr(h->text, ':') + 1;
2295 while (isspace(*s)) s++;
2297 parse_allow_group = TRUE; /* Allow address group syntax */
2301 uschar *ss = parse_find_address_end(s, FALSE);
2302 uschar *recipient, *errmess, *p, *pp;
2303 int start, end, domain;
2305 /* Check on maximum */
2307 if (recipients_max > 0 && ++rcount > recipients_max)
2309 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2310 US"message rejected: ", error_rc, stdin, NULL);
2311 /* Does not return */
2314 /* Make a copy of the address, and remove any internal newlines. These
2315 may be present as a result of continuations of the header line. The
2316 white space that follows the newline must not be removed - it is part
2319 pp = recipient = store_get(ss - s + 1);
2320 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2325 BOOL b = allow_utf8_domains;
2326 allow_utf8_domains = TRUE;
2328 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2332 if (string_is_utf8(recipient))
2333 message_smtputf8 = TRUE;
2335 allow_utf8_domains = b;
2339 /* Keep a list of all the bad addresses so we can send a single
2340 error message at the end. However, an empty address is not an error;
2341 just ignore it. This can come from an empty group list like
2343 To: Recipients of list:;
2345 If there are no recipients at all, an error will occur later. */
2347 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2349 int len = Ustrlen(s);
2350 error_block *b = store_get(sizeof(error_block));
2351 while (len > 0 && isspace(s[len-1])) len--;
2353 b->text1 = string_printing(string_copyn(s, len));
2359 /* If the recipient is already in the nonrecipients tree, it must
2360 have appeared on the command line with the option extract_addresses_
2361 remove_arguments set. Do not add it to the recipients, and keep a note
2362 that this has happened, in order to give a better error if there are
2363 no recipients left. */
2365 else if (recipient != NULL)
2367 if (tree_search(tree_nonrecipients, recipient) == NULL)
2368 receive_add_recipient(recipient, -1);
2370 extracted_ignored = TRUE;
2373 /* Move on past this address */
2375 s = ss + (*ss? 1:0);
2376 while (isspace(*s)) s++;
2377 } /* Next address */
2379 parse_allow_group = FALSE; /* Reset group syntax flags */
2380 parse_found_group = FALSE;
2382 /* If this was the bcc: header, mark it "old", which means it
2383 will be kept on the spool, but not transmitted as part of the
2386 if (h->type == htype_bcc) h->type = htype_old;
2387 } /* For appropriate header line */
2388 } /* For each header line */
2392 /* Now build the unique message id. This has changed several times over the
2393 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2394 Retaining all the history in the comment has become too unwieldy - read
2395 previous release sources if you want it.
2397 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2398 The first part is the current time, in seconds. The second part is the current
2399 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2400 can hold a number in the range 0-3843. It used to be a computed sequence
2401 number, but is now the fractional component of the current time in units of
2402 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2403 received, Exim ensures that the timer has ticked at the appropriate level
2404 before proceeding, to avoid duplication if the pid happened to be re-used
2405 within the same time period. It seems likely that most messages will take at
2406 least half a millisecond to be received, so no delay will normally be
2407 necessary. At least for some time...
2409 There is a modification when localhost_number is set. Formerly this was allowed
2410 to be as large as 255. Now it is restricted to the range 0-16, and the final
2411 component of the message id becomes (localhost_number * 200) + fractional time
2412 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2414 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2415 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2416 still allows the tttttt field to hold a large enough number to last for some
2417 more decades, and the final two-digit field can hold numbers up to 1295, which
2418 is enough for milliseconds (instead of 1/2000 of a second).
2420 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2421 pid, so it is probably safe because pids have to be positive. The
2422 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2423 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2425 Note that string_base62() returns its data in a static storage block, so it
2426 must be copied before calling string_base62() again. It always returns exactly
2429 There doesn't seem to be anything in the RFC which requires a message id to
2430 start with a letter, but Smail was changed to ensure this. The external form of
2431 the message id (as supplied by string expansion) therefore starts with an
2432 additional leading 'E'. The spool file names do not include this leading
2433 letter and it is not used internally.
2435 NOTE: If ever the format of message ids is changed, the regular expression for
2436 checking that a string is in this format must be updated in a corresponding
2437 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2438 must also be changed to reflect the correct string length. Then, of course,
2439 other programs that rely on the message id format will need updating too. */
2441 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2442 message_id[6] = '-';
2443 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2445 /* Deal with the case where the host number is set. The value of the number was
2446 checked when it was read, to ensure it isn't too big. The timing granularity is
2447 left in id_resolution so that an appropriate wait can be done after receiving
2448 the message, if necessary (we hope it won't be). */
2450 if (host_number_string != NULL)
2452 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2453 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2454 string_base62((long int)(
2455 host_number * (1000000/id_resolution) +
2456 message_id_tv.tv_usec/id_resolution)) + 4);
2459 /* Host number not set: final field is just the fractional time at an
2460 appropriate resolution. */
2464 id_resolution = (BASE_62 == 62)? 500 : 1000;
2465 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2466 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2469 /* Add the current message id onto the current process info string if
2472 (void)string_format(process_info + process_info_len,
2473 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2475 /* If we are using multiple input directories, set up the one for this message
2476 to be the least significant base-62 digit of the time of arrival. Otherwise
2477 ensure that it is an empty string. */
2479 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2481 /* Now that we have the message-id, if there is no message-id: header, generate
2482 one, but only for local (without suppress_local_fixups) or submission mode
2483 messages. This can be user-configured if required, but we had better flatten
2484 any illegal characters therein. */
2486 if (msgid_header == NULL &&
2487 ((sender_host_address == NULL && !suppress_local_fixups)
2488 || submission_mode))
2491 uschar *id_text = US"";
2492 uschar *id_domain = primary_hostname;
2494 /* Permit only letters, digits, dots, and hyphens in the domain */
2496 if (message_id_domain != NULL)
2498 uschar *new_id_domain = expand_string(message_id_domain);
2499 if (new_id_domain == NULL)
2501 if (!expand_string_forcedfail)
2502 log_write(0, LOG_MAIN|LOG_PANIC,
2503 "expansion of \"%s\" (message_id_header_domain) "
2504 "failed: %s", message_id_domain, expand_string_message);
2506 else if (*new_id_domain != 0)
2508 id_domain = new_id_domain;
2509 for (p = id_domain; *p != 0; p++)
2510 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2514 /* Permit all characters except controls and RFC 2822 specials in the
2515 additional text part. */
2517 if (message_id_text != NULL)
2519 uschar *new_id_text = expand_string(message_id_text);
2520 if (new_id_text == NULL)
2522 if (!expand_string_forcedfail)
2523 log_write(0, LOG_MAIN|LOG_PANIC,
2524 "expansion of \"%s\" (message_id_header_text) "
2525 "failed: %s", message_id_text, expand_string_message);
2527 else if (*new_id_text != 0)
2529 id_text = new_id_text;
2530 for (p = id_text; *p != 0; p++)
2531 if (mac_iscntrl_or_special(*p)) *p = '-';
2535 /* Add the header line
2536 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2537 * appended, to preserve classical expectations of header ordering. */
2539 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2540 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2541 (*id_text == 0)? "" : ".", id_text, id_domain);
2544 /* If we are to log recipients, keep a copy of the raw ones before any possible
2545 rewriting. Must copy the count, because later ACLs and the local_scan()
2546 function may mess with the real recipients. */
2548 if (LOGGING(received_recipients))
2550 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2551 for (i = 0; i < recipients_count; i++)
2552 raw_recipients[i] = string_copy(recipients_list[i].address);
2553 raw_recipients_count = recipients_count;
2556 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2557 recipients will get here only if the conditions were right (allow_unqualified_
2558 recipient is TRUE). */
2560 for (i = 0; i < recipients_count; i++)
2561 recipients_list[i].address =
2562 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2563 global_rewrite_rules, rewrite_existflags);
2565 /* If there is no From: header, generate one for local (without
2566 suppress_local_fixups) or submission_mode messages. If there is no sender
2567 address, but the sender is local or this is a local delivery error, use the
2568 originator login. This shouldn't happen for genuine bounces, but might happen
2569 for autoreplies. The addition of From: must be done *before* checking for the
2570 possible addition of a Sender: header, because untrusted_set_sender allows an
2571 untrusted user to set anything in the envelope (which might then get info
2572 From:) but we still want to ensure a valid Sender: if it is required. */
2574 if (from_header == NULL &&
2575 ((sender_host_address == NULL && !suppress_local_fixups)
2576 || submission_mode))
2578 uschar *oname = US"";
2580 /* Use the originator_name if this is a locally submitted message and the
2581 caller is not trusted. For trusted callers, use it only if -F was used to
2582 force its value or if we have a non-SMTP message for which -f was not used
2583 to set the sender. */
2585 if (sender_host_address == NULL)
2587 if (!trusted_caller || sender_name_forced ||
2588 (!smtp_input && !sender_address_forced))
2589 oname = originator_name;
2592 /* For non-locally submitted messages, the only time we use the originator
2593 name is when it was forced by the /name= option on control=submission. */
2597 if (submission_name != NULL) oname = submission_name;
2600 /* Envelope sender is empty */
2602 if (sender_address[0] == 0)
2604 uschar *fromstart, *fromend;
2606 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2607 oname, (oname[0] == 0)? "" : " <");
2608 fromend = (oname[0] == 0)? US"" : US">";
2610 if (sender_local || local_error_message)
2612 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2613 local_part_quote(originator_login), qualify_domain_sender,
2616 else if (submission_mode && authenticated_id != NULL)
2618 if (submission_domain == NULL)
2620 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2621 local_part_quote(authenticated_id), qualify_domain_sender,
2624 else if (submission_domain[0] == 0) /* empty => whole address set */
2626 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2631 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2632 local_part_quote(authenticated_id), submission_domain,
2635 from_header = header_last; /* To get it checked for Sender: */
2639 /* There is a non-null envelope sender. Build the header using the original
2640 sender address, before any rewriting that might have been done while
2645 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2647 (oname[0] == 0)? "" : " <",
2648 (sender_address_unrewritten == NULL)?
2649 sender_address : sender_address_unrewritten,
2650 (oname[0] == 0)? "" : ">");
2652 from_header = header_last; /* To get it checked for Sender: */
2657 /* If the sender is local (without suppress_local_fixups), or if we are in
2658 submission mode and there is an authenticated_id, check that an existing From:
2659 is correct, and if not, generate a Sender: header, unless disabled. Any
2660 previously-existing Sender: header was removed above. Note that sender_local,
2661 as well as being TRUE if the caller of exim is not trusted, is also true if a
2662 trusted caller did not supply a -f argument for non-smtp input. To allow
2663 trusted callers to forge From: without supplying -f, we have to test explicitly
2664 here. If the From: header contains more than one address, then the call to
2665 parse_extract_address fails, and a Sender: header is inserted, as required. */
2667 if (from_header != NULL &&
2668 (active_local_from_check &&
2669 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2670 (submission_mode && authenticated_id != NULL))
2673 BOOL make_sender = TRUE;
2674 int start, end, domain;
2676 uschar *from_address =
2677 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2678 &start, &end, &domain, FALSE);
2679 uschar *generated_sender_address;
2681 if (submission_mode)
2683 if (submission_domain == NULL)
2685 generated_sender_address = string_sprintf("%s@%s",
2686 local_part_quote(authenticated_id), qualify_domain_sender);
2688 else if (submission_domain[0] == 0) /* empty => full address */
2690 generated_sender_address = string_sprintf("%s",
2695 generated_sender_address = string_sprintf("%s@%s",
2696 local_part_quote(authenticated_id), submission_domain);
2700 generated_sender_address = string_sprintf("%s@%s",
2701 local_part_quote(originator_login), qualify_domain_sender);
2703 /* Remove permitted prefixes and suffixes from the local part of the From:
2704 address before doing the comparison with the generated sender. */
2706 if (from_address != NULL)
2709 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2711 if (at != NULL) *at = 0;
2712 from_address += route_check_prefix(from_address, local_from_prefix);
2713 slen = route_check_suffix(from_address, local_from_suffix);
2716 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2717 from_address += slen;
2719 if (at != NULL) *at = '@';
2721 if (strcmpic(generated_sender_address, from_address) == 0 ||
2722 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2723 make_sender = FALSE;
2726 /* We have to cause the Sender header to be rewritten if there are
2727 appropriate rewriting rules. */
2731 if (submission_mode && submission_name == NULL)
2732 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2733 generated_sender_address);
2735 header_add(htype_sender, "%sSender: %s <%s>\n",
2737 submission_mode? submission_name : originator_name,
2738 generated_sender_address);
2741 /* Ensure that a non-null envelope sender address corresponds to the
2742 submission mode sender address. */
2744 if (submission_mode && sender_address[0] != 0)
2746 if (sender_address_unrewritten == NULL)
2747 sender_address_unrewritten = sender_address;
2748 sender_address = generated_sender_address;
2749 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2750 log_write(L_address_rewrite, LOG_MAIN,
2751 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2752 sender_address_unrewritten, generated_sender_address);
2756 /* If there are any rewriting rules, apply them to the sender address, unless
2757 it has already been rewritten as part of verification for SMTP input. */
2759 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2760 sender_address[0] != 0)
2762 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2763 global_rewrite_rules, rewrite_existflags);
2764 DEBUG(D_receive|D_rewrite)
2765 debug_printf("rewritten sender = %s\n", sender_address);
2769 /* The headers must be run through rewrite_header(), because it ensures that
2770 addresses are fully qualified, as well as applying any rewriting rules that may
2773 Qualification of header addresses in a message from a remote host happens only
2774 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2775 appropriate. For local messages, qualification always happens, unless -bnq is
2776 used to explicitly suppress it. No rewriting is done for an unqualified address
2777 that is left untouched.
2779 We start at the second header, skipping our own Received:. This rewriting is
2780 documented as happening *after* recipient addresses are taken from the headers
2781 by the -t command line option. An added Sender: gets rewritten here. */
2783 for (h = header_list->next; h != NULL; h = h->next)
2785 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2786 rewrite_existflags, TRUE);
2787 if (newh != NULL) h = newh;
2791 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2792 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2793 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2794 exists, this applies to the set of resent- headers rather than the normal set.
2796 The requirement for a recipient header has been removed in RFC 2822. At this
2797 point in the code, earlier versions of Exim added a To: header for locally
2798 submitted messages, and an empty Bcc: header for others. In the light of the
2799 changes in RFC 2822, this was dropped in November 2003. */
2802 /* If there is no date header, generate one if the message originates locally
2803 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2804 submission mode flag is set. Messages without Date: are not valid, but it seems
2805 to be more confusing if Exim adds one to all remotely-originated messages.
2806 As per Message-Id, we prepend if resending, else append.
2809 if (!date_header_exists &&
2810 ((sender_host_address == NULL && !suppress_local_fixups)
2811 || submission_mode))
2812 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2813 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2815 search_tidyup(); /* Free any cached resources */
2817 /* Show the complete set of headers if debugging. Note that the first one (the
2818 new Received:) has not yet been set. */
2822 debug_printf(">>Headers after rewriting and local additions:\n");
2823 for (h = header_list->next; h != NULL; h = h->next)
2824 debug_printf("%c %s", h->type, h->text);
2828 /* The headers are now complete in store. If we are running in filter
2829 testing mode, that is all this function does. Return TRUE if the message
2830 ended with a dot. */
2832 if (filter_test != FTEST_NONE)
2834 process_info[process_info_len] = 0;
2835 return message_ended == END_DOT;
2838 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now */
2839 /* Cutthrough delivery:
2840 We have to create the Received header now rather than at the end of reception,
2841 so the timestamp behaviour is a change to the normal case.
2842 XXX Ensure this gets documented XXX.
2843 Having created it, send the headers to the destination. */
2844 if (cutthrough.fd >= 0)
2846 if (received_count > received_headers_max)
2848 cancel_cutthrough_connection("too many headers");
2849 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2850 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2851 "Too many \"Received\" headers",
2853 (sender_fullhost == NULL)? "" : " H=",
2854 (sender_fullhost == NULL)? US"" : sender_fullhost,
2855 (sender_ident == NULL)? "" : " U=",
2856 (sender_ident == NULL)? US"" : sender_ident);
2857 message_id[0] = 0; /* Indicate no message accepted */
2858 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2859 goto TIDYUP; /* Skip to end of function */
2861 received_header_gen();
2862 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2863 (void) cutthrough_headers_send();
2867 /* Open a new spool file for the data portion of the message. We need
2868 to access it both via a file descriptor and a stream. Try to make the
2869 directory if it isn't there. */
2871 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
2872 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
2874 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
2876 if (errno == ENOENT)
2878 (void) directory_make(spool_directory,
2879 spool_sname(US"input", message_subdir),
2880 INPUT_DIRECTORY_MODE, TRUE);
2881 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2884 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2885 spool_name, strerror(errno));
2888 /* Make sure the file's group is the Exim gid, and double-check the mode
2889 because the group setting doesn't always get set automatically. */
2891 if (fchown(data_fd, exim_uid, exim_gid))
2892 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2893 "Failed setting ownership on spool file %s: %s",
2894 spool_name, strerror(errno));
2895 (void)fchmod(data_fd, SPOOL_MODE);
2897 /* We now have data file open. Build a stream for it and lock it. We lock only
2898 the first line of the file (containing the message ID) because otherwise there
2899 are problems when Exim is run under Cygwin (I'm told). See comments in
2900 spool_in.c, where the same locking is done. */
2902 data_file = fdopen(data_fd, "w+");
2903 lock_data.l_type = F_WRLCK;
2904 lock_data.l_whence = SEEK_SET;
2905 lock_data.l_start = 0;
2906 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2908 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2909 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2910 errno, strerror(errno));
2912 /* We have an open, locked data file. Write the message id to it to make it
2913 self-identifying. Then read the remainder of the input of this message and
2914 write it to the data file. If the variable next != NULL, it contains the first
2915 data line (which was read as a header but then turned out not to have the right
2916 format); write it (remembering that it might contain binary zeros). The result
2917 of fwrite() isn't inspected; instead we call ferror() below. */
2919 fprintf(data_file, "%s-D\n", message_id);
2922 uschar *s = next->text;
2923 int len = next->slen;
2924 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2925 body_linecount++; /* Assumes only 1 line */
2928 /* Note that we might already be at end of file, or the logical end of file
2929 (indicated by '.'), or might have encountered an error while writing the
2930 message id or "next" line. */
2932 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2936 /*XXX CHUNKING: main data read, for message body */
2937 message_ended = read_message_data_smtp(data_file);
2938 receive_linecount++; /* The terminating "." line */
2940 else message_ended = read_message_data(data_file);
2942 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2943 message_linecount += body_linecount;
2945 /* Handle premature termination of SMTP */
2947 if (smtp_input && message_ended == END_EOF)
2949 Uunlink(spool_name); /* Lose data file when closed */
2950 cancel_cutthrough_connection("sender closed connection");
2951 message_id[0] = 0; /* Indicate no message accepted */
2952 smtp_reply = handle_lost_connection(US"");
2954 goto TIDYUP; /* Skip to end of function */
2957 /* Handle message that is too big. Don't use host_or_ident() in the log
2958 message; we want to see the ident value even for non-remote messages. */
2960 if (message_ended == END_SIZE)
2962 Uunlink(spool_name); /* Lose the data file when closed */
2963 cancel_cutthrough_connection("mail too big");
2964 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2966 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2967 "message too big: read=%d max=%d",
2969 (sender_fullhost == NULL)? "" : " H=",
2970 (sender_fullhost == NULL)? US"" : sender_fullhost,
2971 (sender_ident == NULL)? "" : " U=",
2972 (sender_ident == NULL)? US"" : sender_ident,
2974 thismessage_size_limit);
2978 smtp_reply = US"552 Message size exceeds maximum permitted";
2979 message_id[0] = 0; /* Indicate no message accepted */
2980 goto TIDYUP; /* Skip to end of function */
2984 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2985 give_local_error(ERRMESS_TOOBIG,
2986 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2987 US"message rejected: ", error_rc, data_file, header_list);
2988 /* Does not return */
2993 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2994 example, there may be some expansion in an ACL that uses a timer.) */
2996 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2998 /* The message body has now been read into the data file. Call fflush() to
2999 empty the buffers in C, and then call fsync() to get the data written out onto
3000 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3001 having to do this). If there was an I/O error on either input or output,
3002 attempt to send an error message, and unlink the spool file. For non-SMTP input
3003 we can then give up. Note that for SMTP input we must swallow the remainder of
3004 the input in cases of output errors, since the far end doesn't expect to see
3005 anything until the terminating dot line is sent. */
3007 if (fflush(data_file) == EOF || ferror(data_file) ||
3008 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3010 uschar *msg_errno = US strerror(errno);
3011 BOOL input_error = (receive_ferror)() != 0;
3012 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3013 input_error? "Input read" : "Spool write",
3015 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3017 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3018 Uunlink(spool_name); /* Lose the data file */
3019 cancel_cutthrough_connection("error writing spoolfile");
3024 smtp_reply = US"451 Error while reading input data";
3027 smtp_reply = US"451 Error while writing spool file";
3028 receive_swallow_smtp();
3030 message_id[0] = 0; /* Indicate no message accepted */
3031 goto TIDYUP; /* Skip to end of function */
3036 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3037 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3039 /* Does not return */
3044 /* No I/O errors were encountered while writing the data file. */
3046 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3049 /* If there were any bad addresses extracted by -t, or there were no recipients
3050 left after -t, send a message to the sender of this message, or write it to
3051 stderr if the error handling option is set that way. Note that there may
3052 legitimately be no recipients for an SMTP message if they have all been removed
3055 We need to rewind the data file in order to read it. In the case of no
3056 recipients or stderr error writing, throw the data file away afterwards, and
3057 exit. (This can't be SMTP, which always ensures there's at least one
3058 syntactically good recipient address.) */
3060 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3064 if (recipients_count == 0) debug_printf("*** No recipients\n");
3065 if (bad_addresses != NULL)
3067 error_block *eblock = bad_addresses;
3068 debug_printf("*** Bad address(es)\n");
3069 while (eblock != NULL)
3071 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3072 eblock = eblock->next;
3077 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3079 /* If configured to send errors to the sender, but this fails, force
3080 a failure error code. We use a special one for no recipients so that it
3081 can be detected by the autoreply transport. Otherwise error_rc is set to
3082 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3083 it is EXIT_SUCCESS. */
3085 if (error_handling == ERRORS_SENDER)
3087 if (!moan_to_sender(
3088 (bad_addresses == NULL)?
3089 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3090 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3091 bad_addresses, header_list, data_file, FALSE))
3092 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3096 if (bad_addresses == NULL)
3098 if (extracted_ignored)
3099 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3101 fprintf(stderr, "exim: no recipients in message\n");
3105 fprintf(stderr, "exim: invalid address%s",
3106 (bad_addresses->next == NULL)? ":" : "es:\n");
3107 while (bad_addresses != NULL)
3109 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3110 bad_addresses->text2);
3111 bad_addresses = bad_addresses->next;
3116 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3118 Uunlink(spool_name);
3119 (void)fclose(data_file);
3120 exim_exit(error_rc);
3124 /* Data file successfully written. Generate text for the Received: header by
3125 expanding the configured string, and adding a timestamp. By leaving this
3126 operation till now, we ensure that the timestamp is the time that message
3127 reception was completed. However, this is deliberately done before calling the
3128 data ACL and local_scan().
3130 This Received: header may therefore be inspected by the data ACL and by code in
3131 the local_scan() function. When they have run, we update the timestamp to be
3132 the final time of reception.
3134 If there is just one recipient, set up its value in the $received_for variable
3135 for use when we generate the Received: header.
3137 Note: the checking for too many Received: headers is handled by the delivery
3139 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3141 if (received_header->text == NULL) /* Non-cutthrough case */
3143 received_header_gen();
3145 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3147 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3148 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3150 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3151 now, before running the DATA ACL. */
3153 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3156 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3157 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3159 /* If an ACL is specified for checking things at this stage of reception of a
3160 message, run it, unless all the recipients were removed by "discard" in earlier
3161 ACLs. That is the only case in which recipients_count can be zero at this
3162 stage. Set deliver_datafile to point to the data file so that $message_body and
3163 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3166 deliver_datafile = data_fd;
3169 enable_dollar_recipients = TRUE;
3171 if (recipients_count == 0)
3173 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3177 /* Handle interactive SMTP messages */
3179 if (smtp_input && !smtp_batched_input)
3182 #ifndef DISABLE_DKIM
3183 if (!dkim_disable_verify)
3185 /* Finish verification, this will log individual signature results to
3187 dkim_exim_verify_finish();
3189 /* Check if we must run the DKIM ACL */
3190 if ((acl_smtp_dkim != NULL) &&
3191 (dkim_verify_signers != NULL) &&
3192 (dkim_verify_signers[0] != '\0'))
3194 uschar *dkim_verify_signers_expanded =
3195 expand_string(dkim_verify_signers);
3196 if (dkim_verify_signers_expanded == NULL)
3198 log_write(0, LOG_MAIN|LOG_PANIC,
3199 "expansion of dkim_verify_signers option failed: %s",
3200 expand_string_message);
3205 const uschar *ptr = dkim_verify_signers_expanded;
3206 uschar *item = NULL;
3207 uschar *seen_items = NULL;
3208 int seen_items_size = 0;
3209 int seen_items_offset = 0;
3210 uschar itembuf[256];
3211 /* Default to OK when no items are present */
3213 while ((item = string_nextinlist(&ptr, &sep,
3217 /* Prevent running ACL for an empty item */
3218 if (!item || (item[0] == '\0')) continue;
3220 /* Only run ACL once for each domain or identity,
3221 no matter how often it appears in the expanded list. */
3224 uschar *seen_item = NULL;
3225 uschar seen_item_buf[256];
3226 const uschar *seen_items_list = seen_items;
3227 BOOL seen_this_item = FALSE;
3229 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3231 sizeof(seen_item_buf))))
3232 if (Ustrcmp(seen_item,item) == 0)
3234 seen_this_item = TRUE;
3241 debug_printf("acl_smtp_dkim: skipping signer %s, "
3242 "already seen\n", item);
3246 seen_items = string_append(seen_items, &seen_items_size,
3247 &seen_items_offset, 1, ":");
3250 seen_items = string_append(seen_items, &seen_items_size,
3251 &seen_items_offset, 1, item);
3252 seen_items[seen_items_offset] = '\0';
3255 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3258 dkim_exim_acl_setup(item);
3259 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3260 &user_msg, &log_msg);
3265 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3266 "skipping remaining items\n", rc, item);
3267 cancel_cutthrough_connection("dkim acl not ok");
3271 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3274 recipients_count = 0;
3275 blackholed_by = US"DKIM ACL";
3276 if (log_msg != NULL)
3277 blackhole_log_msg = string_sprintf(": %s", log_msg);
3281 Uunlink(spool_name);
3282 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3283 smtp_yield = FALSE; /* No more messages after dropped connection */
3284 smtp_reply = US""; /* Indicate reply already sent */
3285 message_id[0] = 0; /* Indicate no message accepted */
3286 goto TIDYUP; /* Skip to end of function */
3291 #endif /* DISABLE_DKIM */
3293 #ifdef WITH_CONTENT_SCAN
3294 if (recipients_count > 0 &&
3295 acl_smtp_mime != NULL &&
3296 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3298 #endif /* WITH_CONTENT_SCAN */
3300 #ifdef EXPERIMENTAL_DMARC
3301 dmarc_up = dmarc_store_data(from_header);
3302 #endif /* EXPERIMENTAL_DMARC */
3304 #ifndef DISABLE_PRDR
3305 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3309 int all_fail = FAIL;
3311 smtp_printf("353 PRDR content analysis beginning\r\n");
3312 /* Loop through recipients, responses must be in same order received */
3313 for (c = 0; recipients_count > c; c++)
3315 uschar * addr= recipients_list[c].address;
3316 uschar * msg= US"PRDR R=<%s> %s";
3319 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3320 addr, c+1, recipients_count);
3321 rc = acl_check(ACL_WHERE_PRDR, addr,
3322 acl_smtp_data_prdr, &user_msg, &log_msg);
3324 /* If any recipient rejected content, indicate it in final message */
3326 /* If all recipients rejected, indicate in final message */
3331 case OK: case DISCARD: code = US"250"; break;
3332 case DEFER: code = US"450"; break;
3333 default: code = US"550"; break;
3335 if (user_msg != NULL)
3336 smtp_user_msg(code, user_msg);
3341 case OK: case DISCARD:
3342 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3344 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3346 msg = string_sprintf(CS msg, addr, "refusal"); break;
3348 smtp_user_msg(code, msg);
3350 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3351 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3352 else log_write(0, LOG_MAIN, "%s", CS msg);
3354 if (rc != OK) { receive_remove_recipient(addr); c--; }
3356 /* Set up final message, used if data acl gives OK */
3357 smtp_reply = string_sprintf("%s id=%s message %s",
3358 all_fail == FAIL ? US"550" : US"250",
3361 ? US"rejected for all recipients"
3364 : US"accepted for some recipients");
3365 if (recipients_count == 0)
3367 message_id[0] = 0; /* Indicate no message accepted */
3372 prdr_requested = FALSE;
3373 #endif /* !DISABLE_PRDR */
3375 /* Check the recipients count again, as the MIME ACL might have changed
3378 if (acl_smtp_data != NULL && recipients_count > 0)
3380 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3381 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3384 recipients_count = 0;
3385 blackholed_by = US"DATA ACL";
3386 if (log_msg != NULL)
3387 blackhole_log_msg = string_sprintf(": %s", log_msg);
3388 cancel_cutthrough_connection("data acl discard");
3392 Uunlink(spool_name);
3393 cancel_cutthrough_connection("data acl not ok");
3394 #ifdef WITH_CONTENT_SCAN
3397 #ifdef EXPERIMENTAL_DCC
3400 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3401 smtp_yield = FALSE; /* No more messages after dropped connection */
3402 smtp_reply = US""; /* Indicate reply already sent */
3403 message_id[0] = 0; /* Indicate no message accepted */
3404 goto TIDYUP; /* Skip to end of function */
3409 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3410 we cannot take different actions for permanent and temporary rejections. */
3415 #ifdef WITH_CONTENT_SCAN
3416 if (acl_not_smtp_mime != NULL &&
3417 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3420 #endif /* WITH_CONTENT_SCAN */
3422 if (acl_not_smtp != NULL)
3424 uschar *user_msg, *log_msg;
3425 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3428 recipients_count = 0;
3429 blackholed_by = US"non-SMTP ACL";
3430 if (log_msg != NULL)
3431 blackhole_log_msg = string_sprintf(": %s", log_msg);
3435 Uunlink(spool_name);
3436 #ifdef WITH_CONTENT_SCAN
3439 #ifdef EXPERIMENTAL_DCC
3442 /* The ACL can specify where rejections are to be logged, possibly
3443 nowhere. The default is main and reject logs. */
3445 if (log_reject_target != 0)
3446 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3447 sender_address, log_msg);
3449 if (user_msg == NULL) user_msg = US"local configuration problem";
3450 if (smtp_batched_input)
3452 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3453 /* Does not return */
3457 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3458 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3459 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3461 /* Does not return */
3464 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3468 /* The applicable ACLs have been run */
3470 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3471 if (queue_only_policy) queued_by = US"ACL";
3474 #ifdef WITH_CONTENT_SCAN
3478 #ifdef EXPERIMENTAL_DCC
3483 /* The final check on the message is to run the scan_local() function. The
3484 version supplied with Exim always accepts, but this is a hook for sysadmins to
3485 supply their own checking code. The local_scan() function is run even when all
3486 the recipients have been discarded. */
3488 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3490 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3491 deleted, and the incident gets logged. */
3493 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3494 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3495 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3496 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3498 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3499 local_scan_timeout);
3500 local_scan_data = NULL;
3502 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3503 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3504 rc = local_scan(data_fd, &local_scan_data);
3506 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3508 enable_dollar_recipients = FALSE;
3510 store_pool = POOL_MAIN; /* In case changed */
3511 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3514 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3515 os_non_restarting_signal(SIGFPE, SIG_DFL);
3516 os_non_restarting_signal(SIGILL, SIG_DFL);
3517 os_non_restarting_signal(SIGBUS, SIG_DFL);
3519 /* The length check is paranoia against some runaway code, and also because
3520 (for a success return) lines in the spool file are read into big_buffer. */
3522 if (local_scan_data != NULL)
3524 int len = Ustrlen(local_scan_data);
3525 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3526 local_scan_data = string_copyn(local_scan_data, len);
3529 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3531 if (!deliver_freeze) /* ACL might have already frozen */
3533 deliver_freeze = TRUE;
3534 deliver_frozen_at = time(NULL);
3535 frozen_by = US"local_scan()";
3537 rc = LOCAL_SCAN_ACCEPT;
3539 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3541 if (!queue_only_policy) /* ACL might have already queued */
3543 queue_only_policy = TRUE;
3544 queued_by = US"local_scan()";
3546 rc = LOCAL_SCAN_ACCEPT;
3549 /* Message accepted: remove newlines in local_scan_data because otherwise
3550 the spool file gets corrupted. Ensure that all recipients are qualified. */
3552 if (rc == LOCAL_SCAN_ACCEPT)
3554 if (local_scan_data != NULL)
3557 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3559 for (i = 0; i < recipients_count; i++)
3561 recipient_item *r = recipients_list + i;
3562 r->address = rewrite_address_qualify(r->address, TRUE);
3563 if (r->errors_to != NULL)
3564 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3566 if (recipients_count == 0 && blackholed_by == NULL)
3567 blackholed_by = US"local_scan";
3570 /* Message rejected: newlines permitted in local_scan_data to generate
3571 multiline SMTP responses. */
3575 uschar *istemp = US"";
3581 errmsg = local_scan_data;
3583 Uunlink(spool_name); /* Cancel this message */
3587 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3588 "rejection given", rc);
3591 case LOCAL_SCAN_REJECT_NOLOGHDR:
3592 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3595 case LOCAL_SCAN_REJECT:
3596 smtp_code = US"550";
3597 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3600 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3601 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3604 case LOCAL_SCAN_TEMPREJECT:
3606 smtp_code = US"451";
3607 if (errmsg == NULL) errmsg = US"Temporary local problem";
3608 istemp = US"temporarily ";
3612 s = string_append(s, &size, &sptr, 2, US"F=",
3613 (sender_address[0] == 0)? US"<>" : sender_address);
3614 s = add_host_info_for_log(s, &size, &sptr);
3617 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3618 s, istemp, string_printing(errmsg));
3622 if (!smtp_batched_input)
3624 smtp_respond(smtp_code, 3, TRUE, errmsg);
3625 message_id[0] = 0; /* Indicate no message accepted */
3626 smtp_reply = US""; /* Indicate reply already sent */
3627 goto TIDYUP; /* Skip to end of function */
3631 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3632 /* Does not return */
3637 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3638 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3639 US"message rejected by local scan code: ", error_rc, data_file,
3641 /* Does not return */
3645 /* Reset signal handlers to ignore signals that previously would have caused
3646 the message to be abandoned. */
3648 signal(SIGTERM, SIG_IGN);
3649 signal(SIGINT, SIG_IGN);
3652 /* Ensure the first time flag is set in the newly-received message. */
3654 deliver_firsttime = TRUE;
3656 #ifdef EXPERIMENTAL_BRIGHTMAIL
3658 { /* rewind data file */
3659 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3660 bmi_verdicts = bmi_process_message(header_list, data_fd);
3664 /* Update the timstamp in our Received: header to account for any time taken by
3665 an ACL or by local_scan(). The new time is the time that all reception
3666 processing is complete. */
3668 timestamp = expand_string(US"${tod_full}");
3669 tslen = Ustrlen(timestamp);
3671 memcpy(received_header->text + received_header->slen - tslen - 1,
3674 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3678 deliver_freeze = FALSE;
3679 queue_only_policy = FALSE;
3682 /* Keep the data file open until we have written the header file, in order to
3683 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3684 don't write the header file, and we unlink the data file. If writing the header
3685 file fails, we have failed to accept this message. */
3687 if (host_checking || blackholed_by != NULL)
3690 Uunlink(spool_name);
3691 msg_size = 0; /* Compute size for log line */
3692 for (h = header_list; h != NULL; h = h->next)
3693 if (h->type != '*') msg_size += h->slen;
3696 /* Write the -H file */
3699 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3701 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3702 Uunlink(spool_name); /* Lose the data file */
3706 smtp_reply = US"451 Error in writing spool file";
3707 message_id[0] = 0; /* Indicate no message accepted */
3712 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3713 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3715 /* Does not return */
3720 /* The message has now been successfully received. */
3722 receive_messagecount++;
3724 /* In SMTP sessions we may receive several in one connection. After each one,
3725 we wait for the clock to tick at the level of message-id granularity. This is
3726 so that the combination of time+pid is unique, even on systems where the pid
3727 can be re-used within our time interval. We can't shorten the interval without
3728 re-designing the message-id. See comments above where the message id is
3729 created. This is Something For The Future. */
3731 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3732 exim_wait_tick(&message_id_tv, id_resolution);
3734 /* Add data size to written header size. We do not count the initial file name
3735 that is in the file, but we do add one extra for the notional blank line that
3736 precedes the data. This total differs from message_size in that it include the
3737 added Received: header and any other headers that got created locally. */
3740 fstat(data_fd, &statbuf);
3742 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3744 /* Generate a "message received" log entry. We do this by building up a dynamic
3745 string as required. Since we commonly want to add two items at a time, use a
3746 macro to simplify the coding. We log the arrival of a new message while the
3747 file is still locked, just in case the machine is *really* fast, and delivers
3748 it first! Include any message id that is in the message - since the syntax of a
3749 message id is actually an addr-spec, we can use the parse routine to canonicize
3754 s = store_get(size);
3756 s = string_append(s, &size, &sptr, 2, US"<= ",
3757 (sender_address[0] == 0)? US"<>" : sender_address);
3758 if (message_reference != NULL)
3759 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3761 s = add_host_info_for_log(s, &size, &sptr);
3764 if (LOGGING(tls_cipher) && tls_in.cipher)
3765 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3766 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3767 s = string_append(s, &size, &sptr, 2, US" CV=",
3768 tls_in.certificate_verified? "yes":"no");
3769 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3770 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3771 string_printing(tls_in.peerdn), US"\"");
3772 if (LOGGING(tls_sni) && tls_in.sni)
3773 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3774 string_printing(tls_in.sni), US"\"");
3777 if (sender_host_authenticated)
3779 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3780 if (authenticated_id != NULL)
3782 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3783 if (LOGGING(smtp_mailauth) && authenticated_sender != NULL)
3784 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3788 #ifndef DISABLE_PRDR
3790 s = string_append(s, &size, &sptr, 1, US" PRDR");
3793 #ifdef SUPPORT_PROXY
3794 if (proxy_session && LOGGING(proxy))
3795 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3798 sprintf(CS big_buffer, "%d", msg_size);
3799 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3801 /* log 8BITMIME mode announced in MAIL_FROM
3805 if (LOGGING(8bitmime))
3807 sprintf(CS big_buffer, "%d", body_8bitmime);
3808 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3812 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
3814 /* If an addr-spec in a message-id contains a quoted string, it can contain
3815 any characters except " \ and CR and so in particular it can contain NL!
3816 Therefore, make sure we use a printing-characters only version for the log.
3817 Also, allow for domain literals in the message id. */
3819 if (msgid_header != NULL)
3822 BOOL save_allow_domain_literals = allow_domain_literals;
3823 allow_domain_literals = TRUE;
3824 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3825 &errmsg, &start, &end, &domain, FALSE);
3826 allow_domain_literals = save_allow_domain_literals;
3828 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3831 /* If subject logging is turned on, create suitable printing-character
3832 text. By expanding $h_subject: we make use of the MIME decoding. */
3834 if (LOGGING(subject) && subject_header != NULL)
3837 uschar *p = big_buffer;
3838 uschar *ss = expand_string(US"$h_subject:");
3840 /* Backslash-quote any double quotes or backslashes so as to make a
3841 a C-like string, and turn any non-printers into escape sequences. */
3844 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3846 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3851 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3854 /* Terminate the string: string_cat() and string_append() leave room, but do
3855 not put the zero in. */
3859 /* Create a message log file if message logs are being used and this message is
3860 not blackholed. Write the reception stuff to it. We used to leave message log
3861 creation until the first delivery, but this has proved confusing for some
3864 if (message_logs && blackholed_by == NULL)
3868 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
3870 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
3874 (void)directory_make(spool_directory,
3875 spool_sname(US"msglog", message_subdir),
3876 MSGLOG_DIRECTORY_MODE, TRUE);
3877 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3882 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3883 spool_name, strerror(errno));
3888 FILE *message_log = fdopen(fd, "a");
3889 if (message_log == NULL)
3891 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3892 spool_name, strerror(errno));
3897 uschar *now = tod_stamp(tod_log);
3898 fprintf(message_log, "%s Received from %s\n", now, s+3);
3899 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3901 if (queue_only_policy) fprintf(message_log,
3902 "%s no immediate delivery: queued by %s\n", now, queued_by);
3903 (void)fclose(message_log);
3908 /* Everything has now been done for a successful message except logging its
3909 arrival, and outputting an SMTP response. While writing to the log, set a flag
3910 to cause a call to receive_bomb_out() if the log cannot be opened. */
3912 receive_call_bombout = TRUE;
3914 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3915 connection has gone away. This can only be done if there is no unconsumed input
3916 waiting in the local input buffer. We can test for this by calling
3917 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3918 input to be sent following the final dot, so the presence of following input is
3921 If the connection is still present, but there is no unread input for the
3922 socket, the result of a select() call will be zero. If, however, the connection
3923 has gone away, or if there is pending input, the result of select() will be
3924 non-zero. The two cases can be distinguished by trying to read the next input
3925 character. If we succeed, we can unread it so that it remains in the local
3926 buffer for handling later. If not, the connection has been lost.
3928 Of course, since TCP/IP is asynchronous, there is always a chance that the
3929 connection will vanish between the time of this test and the sending of the
3930 response, but the chance of this happening should be small. */
3932 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3933 !receive_smtp_buffered())
3936 fd_set select_check;
3937 FD_ZERO(&select_check);
3938 FD_SET(fileno(smtp_in), &select_check);
3942 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3944 int c = (receive_getc)();
3945 if (c != EOF) (receive_ungetc)(c); else
3947 uschar *msg = US"SMTP connection lost after final dot";
3948 smtp_reply = US""; /* No attempt to send a response */
3949 smtp_yield = FALSE; /* Nothing more on this connection */
3951 /* Re-use the log line workspace */
3954 s = string_cat(s, &size, &sptr, msg);
3955 s = add_host_info_for_log(s, &size, &sptr);
3957 log_write(0, LOG_MAIN, "%s", s);
3959 /* Delete the files for this aborted message. */
3961 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
3962 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
3963 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
3970 /* The connection has not gone away; we really are going to take responsibility
3971 for this message. */
3973 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
3976 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
3977 the sender's dot (below).
3978 If rejected: copy response to sender, wipe the spooled files, log approriately.
3979 If temp-reject: accept to sender, keep the spooled files.
3981 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3983 XXX We do not handle queue-only, freezing, or blackholes.
3985 if(cutthrough.fd >= 0)
3987 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the message */
3988 /* Logging was done in finaldot() */
3991 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3992 cutthrough_done = ACCEPTED;
3993 break; /* message_id needed for SMTP accept below */
3995 default: /* Unknown response, or error. Treat as temp-reject. */
3996 case '4': /* Temp-reject. Keep spoolfiles and accept. */
3997 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
3998 break; /* message_id needed for SMTP accept below */
4000 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4001 smtp_reply= msg; /* Pass on the exact error */
4002 cutthrough_done = PERM_REJ;
4007 #ifndef DISABLE_PRDR
4008 if(!smtp_reply || prdr_requested)
4013 log_write(0, LOG_MAIN |
4014 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4015 (LOGGING(received_sender)? LOG_SENDER : 0),
4018 /* Log any control actions taken by an ACL or local_scan(). */
4020 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4021 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4022 "no immediate delivery: queued by %s", queued_by);
4024 receive_call_bombout = FALSE;
4026 store_reset(s); /* The store for the main log message can be reused */
4028 /* If the message is frozen, and freeze_tell is set, do the telling. */
4030 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4032 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4033 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4034 message_id, frozen_by, sender_address);
4038 /* Either a message has been successfully received and written to the two spool
4039 files, or an error in writing the spool has occurred for an SMTP message, or
4040 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4041 we will have already given up because there's no point in carrying on!) In
4042 either event, we must now close (and thereby unlock) the data file. In the
4043 successful case, this leaves the message on the spool, ready for delivery. In
4044 the error case, the spool file will be deleted. Then tidy up store, interact
4045 with an SMTP call if necessary, and return.
4047 A fflush() was done earlier in the expectation that any write errors on the
4048 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4049 possible for fclose() to fail - but what to do? What has happened to the lock
4054 process_info[process_info_len] = 0; /* Remove message id */
4055 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4057 /* Now reset signal handlers to their defaults */
4059 signal(SIGTERM, SIG_DFL);
4060 signal(SIGINT, SIG_DFL);
4062 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4063 value, which defaults TRUE - meaning there may be more incoming messages from
4064 this connection. For non-SMTP callers (where there is only ever one message),
4065 the default is FALSE. */
4071 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4072 is set to the response that should be sent. When it is NULL, we generate
4073 default responses. After an ACL error or local_scan() error, the response has
4074 already been sent, and smtp_reply is an empty string to indicate this. */
4076 if (!smtp_batched_input)
4078 if (smtp_reply == NULL)
4080 if (fake_response != OK)
4081 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4082 fake_response_text);
4084 /* An OK response is required; use "message" text if present. */
4086 else if (user_msg != NULL)
4088 uschar *code = US"250";
4090 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4091 smtp_respond(code, len, TRUE, user_msg);
4094 /* Default OK response */
4097 smtp_printf("250 OK id=%s\r\n", message_id);
4100 "\n**** SMTP testing: that is not a real message id!\n\n");
4103 /* smtp_reply is set non-empty */
4105 else if (smtp_reply[0] != 0)
4107 if (fake_response != OK && (smtp_reply[0] == '2'))
4108 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4109 fake_response_text);
4111 smtp_printf("%.1024s\r\n", smtp_reply);
4114 switch (cutthrough_done)
4116 case ACCEPTED: log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4118 { /* Delete spool files */
4119 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4120 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4121 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4123 case TMP_REJ: message_id[0] = 0; /* Prevent a delivery from starting */
4126 cutthrough.delivery = FALSE;
4129 /* For batched SMTP, generate an error message on failure, and do
4130 nothing on success. The function moan_smtp_batch() does not return -
4131 it exits from the program with a non-zero return code. */
4133 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
4137 /* If blackholing, we can immediately log this message's sad fate. The data
4138 file has already been unlinked, and the header file was never written to disk.
4139 We must now indicate that nothing was received, to prevent a delivery from
4142 if (blackholed_by != NULL)
4144 const uschar *detail = local_scan_data
4145 ? string_printing(local_scan_data)
4146 : string_sprintf("(%s discarded recipients)", blackholed_by);
4147 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4148 log_write(0, LOG_MAIN, "Completed");
4152 /* Reset headers so that logging of rejects for a subsequent message doesn't
4153 include them. It is also important to set header_last = NULL before exiting
4154 from this function, as this prevents certain rewrites that might happen during
4155 subsequent verifying (of another incoming message) from trying to add headers
4156 when they shouldn't. */
4158 header_list = header_last = NULL;
4160 return yield; /* TRUE if more messages (SMTP only) */
4163 /* End of receive.c */