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[256];
30 /*************************************************
31 * Non-SMTP character reading functions *
32 *************************************************/
34 /* These are the default functions that are set up in the variables such as
35 receive_getc initially. They just call the standard functions, passing stdin as
36 the file. (When SMTP input is occurring, different functions are used by
37 changing the pointer variables.) */
48 return ungetc(c, stdin);
66 /*************************************************
67 * Check that a set sender is allowed *
68 *************************************************/
70 /* This function is called when a local caller sets an explicit sender address.
71 It checks whether this is permitted, which it is for trusted callers.
72 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74 Arguments: the proposed sender address
75 Returns: TRUE for a trusted caller
76 TRUE if the address has been set, untrusted_set_sender has been
77 set, and the address matches something in the list
82 receive_check_set_sender(uschar *newsender)
85 if (trusted_caller) return TRUE;
86 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
87 qnewsender = (Ustrchr(newsender, '@') != NULL)?
88 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 match_address_list(qnewsender, TRUE, TRUE, CUSS &untrusted_set_sender, NULL, -1,
97 /*************************************************
98 * Read space info for a partition *
99 *************************************************/
101 /* This function is called by receive_check_fs() below, and also by string
102 expansion for variables such as $spool_space. The field names for the statvfs
103 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
104 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
105 have inodes, and they return -1 for the number available.
107 Later: It turns out that some file systems that do not have the concept of
108 inodes return 0 rather than -1. Such systems should also return 0 for the total
109 number of inodes, so we require that to be greater than zero before returning
113 isspool TRUE for spool partition, FALSE for log partition
114 inodeptr address of int to receive inode count; -1 if there isn't one
116 Returns: available on-root space, in kilobytes
117 -1 for log partition if there isn't one
119 All values are -1 if the STATFS functions are not available.
123 receive_statvfs(BOOL isspool, int *inodeptr)
126 struct STATVFS statbuf;
131 /* The spool directory must always exist. */
135 path = spool_directory;
139 /* Need to cut down the log file path to the directory, and to ignore any
140 appearance of "syslog" in it. */
144 int sep = ':'; /* Not variable - outside scripts use */
145 const uschar *p = log_file_path;
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
151 if (*p == 0) p = US":";
152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
153 if (Ustrcmp(path, "syslog") != 0)
156 if (path == NULL) /* No log files */
162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
164 subdirectory has been symbolically linked elsewhere. */
168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
178 /* We now have the path; do the business */
180 memset(&statbuf, 0, sizeof(statbuf));
182 if (STATVFS(CS path, &statbuf) != 0)
184 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
185 "%s directory %s: %s", name, spool_directory, strerror(errno));
186 smtp_closedown(US"spool or log directory problem");
187 exim_exit(EXIT_FAILURE);
190 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
192 /* Disks are getting huge. Take care with computing the size in kilobytes. */
194 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
196 /* Unable to find partition sizes in this environment. */
207 /*************************************************
208 * Check space on spool and log partitions *
209 *************************************************/
211 /* This function is called before accepting a message; if any thresholds are
212 set, it checks them. If a message_size is supplied, it checks that there is
213 enough space for that size plus the threshold - i.e. that the message won't
214 reduce the space to the threshold. Not all OS have statvfs(); for those that
215 don't, this function always returns TRUE. For some OS the old function and
216 struct name statfs is used; that is handled by a macro, defined in exim.h.
219 msg_size the (estimated) size of an incoming message
221 Returns: FALSE if there isn't enough space, or if the information cannot
223 TRUE if no check was done or there is enough space
227 receive_check_fs(int msg_size)
231 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
233 space = receive_statvfs(TRUE, &inodes);
236 debug_printf("spool directory space = %dK inodes = %d "
237 "check_space = %dK inodes = %d msg_size = %d\n",
238 space, inodes, check_spool_space, check_spool_inodes, msg_size);
240 if ((space >= 0 && space < check_spool_space) ||
241 (inodes >= 0 && inodes < check_spool_inodes))
243 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
244 "inodes=%d", space, inodes);
249 if (check_log_space > 0 || check_log_inodes > 0)
251 space = receive_statvfs(FALSE, &inodes);
254 debug_printf("log directory space = %dK inodes = %d "
255 "check_space = %dK inodes = %d\n",
256 space, inodes, check_log_space, check_log_inodes);
258 if ((space >= 0 && space < check_log_space) ||
259 (inodes >= 0 && inodes < check_log_inodes))
261 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
262 "inodes=%d", space, inodes);
272 /*************************************************
273 * Bomb out while reading a message *
274 *************************************************/
276 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
277 received, or if there is a timeout. A rarer case might be if the log files are
278 screwed up and Exim can't open them to record a message's arrival. Handling
279 that case is done by setting a flag to cause the log functions to call this
280 function if there is an ultimate disaster. That is why it is globally
284 reason text reason to pass to the not-quit ACL
285 msg default SMTP response to give if in an SMTP session
290 receive_bomb_out(uschar *reason, uschar *msg)
292 static BOOL already_bombing_out;
293 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
294 timeouts, if someone has something slow in their quit ACL. Since the only
295 things we should be doing are to close down cleanly ASAP, on the second
296 pass we also close down stuff that might be opened again, before bypassing
297 the ACL call and exiting. */
299 /* If spool_name is set, it contains the name of the data file that is being
300 written. Unlink it before closing so that it cannot be picked up by a delivery
301 process. Ensure that any header file is also removed. */
303 if (spool_name[0] != '\0')
306 spool_name[Ustrlen(spool_name) - 1] = 'H';
308 spool_name[0] = '\0';
311 /* Now close the file if it is open, either as a fd or a stream. */
313 if (data_file != NULL)
315 (void)fclose(data_file);
317 } else if (data_fd >= 0) {
318 (void)close(data_fd);
322 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
323 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
326 if (!already_bombing_out)
328 already_bombing_out = TRUE;
331 if (smtp_batched_input)
332 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
333 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
334 smtp_active_hostname, msg);
338 /* Exit from the program (non-BSMTP cases) */
340 exim_exit(EXIT_FAILURE);
344 /*************************************************
345 * Data read timeout *
346 *************************************************/
348 /* Handler function for timeouts that occur while reading the data that
351 Argument: the signal number
356 data_timeout_handler(int sig)
360 sig = sig; /* Keep picky compilers happy */
364 msg = US"SMTP incoming data timeout";
365 log_write(L_lost_incoming_connection,
366 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
368 (sender_fullhost != NULL)? sender_fullhost : US"local process",
373 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
374 log_write(L_lost_incoming_connection,
375 LOG_MAIN, "timed out while reading local message");
378 receive_bomb_out(US"data-timeout", msg); /* Does not return */
383 /*************************************************
384 * local_scan() timeout *
385 *************************************************/
387 /* Handler function for timeouts that occur while running a local_scan()
390 Argument: the signal number
395 local_scan_timeout_handler(int sig)
397 sig = sig; /* Keep picky compilers happy */
398 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
399 "message temporarily rejected (size %d)", message_size);
400 /* Does not return */
401 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
406 /*************************************************
407 * local_scan() crashed *
408 *************************************************/
410 /* Handler function for signals that occur while running a local_scan()
413 Argument: the signal number
418 local_scan_crash_handler(int sig)
420 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
421 "signal %d - message temporarily rejected (size %d)", sig, message_size);
422 /* Does not return */
423 receive_bomb_out(US"local-scan-error", US"local verification problem");
427 /*************************************************
428 * SIGTERM or SIGINT received *
429 *************************************************/
431 /* Handler for SIGTERM or SIGINT signals that occur while reading the
432 data that comprises a message.
434 Argument: the signal number
439 data_sigterm_sigint_handler(int sig)
445 msg = US"Service not available - SIGTERM or SIGINT received";
446 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
447 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
451 if (filter_test == FTEST_NONE)
453 fprintf(stderr, "\nexim: %s received - message abandoned\n",
454 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
455 log_write(0, LOG_MAIN, "%s received while reading local message",
456 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
460 receive_bomb_out(US"signal-exit", msg); /* Does not return */
465 /*************************************************
466 * Add new recipient to list *
467 *************************************************/
469 /* This function builds a list of recipient addresses in argc/argv
473 recipient the next address to add to recipients_list
474 pno parent number for fixed aliases; -1 otherwise
480 receive_add_recipient(uschar *recipient, int pno)
482 if (recipients_count >= recipients_list_max)
484 recipient_item *oldlist = recipients_list;
485 int oldmax = recipients_list_max;
486 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
487 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
489 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
492 recipients_list[recipients_count].address = recipient;
493 recipients_list[recipients_count].pno = pno;
494 #ifdef EXPERIMENTAL_BRIGHTMAIL
495 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
496 /* reset optin string pointer for next recipient */
497 bmi_current_optin = NULL;
499 recipients_list[recipients_count].orcpt = NULL;
500 recipients_list[recipients_count].dsn_flags = 0;
501 recipients_list[recipients_count++].errors_to = NULL;
507 /*************************************************
508 * Send user response message *
509 *************************************************/
511 /* This function is passed a default response code and a user message. It calls
512 smtp_message_code() to check and possibly modify the response code, and then
513 calls smtp_respond() to transmit the response. I put this into a function
514 just to avoid a lot of repetition.
517 code the response code
518 user_msg the user message
525 smtp_user_msg(uschar *code, uschar *user_msg)
528 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
529 smtp_respond(code, len, TRUE, user_msg);
537 /*************************************************
538 * Remove a recipient from the list *
539 *************************************************/
541 /* This function is provided for local_scan() to use.
544 recipient address to remove
546 Returns: TRUE if it did remove something; FALSE otherwise
550 receive_remove_recipient(uschar *recipient)
553 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
555 for (count = 0; count < recipients_count; count++)
557 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
559 if ((--recipients_count - count) > 0)
560 memmove(recipients_list + count, recipients_list + count + 1,
561 (recipients_count - count)*sizeof(recipient_item));
572 /*************************************************
573 * Read data portion of a non-SMTP message *
574 *************************************************/
576 /* This function is called to read the remainder of a message (following the
577 header) when the input is not from SMTP - we are receiving a local message on
578 a standard input stream. The message is always terminated by EOF, and is also
579 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
580 two cases for maximum efficiency.
582 Ensure that the body ends with a newline. This will naturally be the case when
583 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
584 as "sequences of lines" - this of course strictly applies only to SMTP, but
585 deliveries into BSD-type mailbox files also require it. Exim used to have a
586 flag for doing this at delivery time, but as it was always set for all
587 transports, I decided to simplify things by putting the check here instead.
589 There is at least one MUA (dtmail) that sends CRLF via this interface, and
590 other programs are known to do this as well. Exim used to have a option for
591 dealing with this: in July 2003, after much discussion, the code has been
592 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
594 However, for the case when a dot on a line by itself terminates a message, the
595 only recognized terminating sequences before and after the dot are LF and CRLF.
596 Otherwise, having read EOL . CR, you don't know whether to read another
599 Internally, in messages stored in Exim's spool files, LF is used as the line
600 terminator. Under the new regime, bare CRs will no longer appear in these
604 fout a FILE to which to write the message
606 Returns: One of the END_xxx values indicating why it stopped reading
610 read_message_data(FILE *fout)
614 register int linelength = 0;
616 /* Handle the case when only EOF terminates the message */
620 register int last_ch = '\n';
622 for (; (ch = (receive_getc)()) != EOF; last_ch = ch)
624 if (ch == 0) body_zerocount++;
625 if (last_ch == '\r' && ch != '\n')
627 if (linelength > max_received_linelength)
628 max_received_linelength = linelength;
630 if (fputc('\n', fout) == EOF) return END_WERROR;
634 if (ch == '\r') continue;
636 if (fputc(ch, fout) == EOF) return END_WERROR;
639 if (linelength > max_received_linelength)
640 max_received_linelength = linelength;
645 if (++message_size > thismessage_size_limit) return END_SIZE;
650 if (linelength > max_received_linelength)
651 max_received_linelength = linelength;
652 if (fputc('\n', fout) == EOF) return END_WERROR;
660 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
664 while ((ch = (receive_getc)()) != EOF)
666 if (ch == 0) body_zerocount++;
669 case 0: /* Normal state (previous char written) */
673 if (linelength > max_received_linelength)
674 max_received_linelength = linelength;
679 { ch_state = 2; continue; }
682 case 1: /* After written "\n" */
683 if (ch == '.') { ch_state = 3; continue; }
684 if (ch == '\r') { ch_state = 2; continue; }
685 if (ch != '\n') ch_state = 0; else linelength = -1;
689 body_linecount++; /* After unwritten "\r" */
690 if (linelength > max_received_linelength)
691 max_received_linelength = linelength;
699 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
700 if (ch == '\r') continue;
706 case 3: /* After "\n." (\n written, dot not) */
707 if (ch == '\n') return END_DOT;
708 if (ch == '\r') { ch_state = 4; continue; }
711 if (fputc('.', fout) == EOF) return END_WERROR;
715 case 4: /* After "\n.\r" (\n written, rest not) */
716 if (ch == '\n') return END_DOT;
719 if (fputs(".\n", fout) == EOF) return END_WERROR;
720 if (ch == '\r') { ch_state = 2; continue; }
726 if (fputc(ch, fout) == EOF) return END_WERROR;
727 if (++message_size > thismessage_size_limit) return END_SIZE;
730 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
731 the message ends with a newline, and we must also write any characters that
732 were saved up while testing for an ending dot. */
736 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
737 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
738 message_size += Ustrlen(ends[ch_state]);
748 /*************************************************
749 * Read data portion of an SMTP message *
750 *************************************************/
752 /* This function is called to read the remainder of an SMTP message (after the
753 headers), or to skip over it when an error has occurred. In this case, the
754 output file is passed as NULL.
756 If any line begins with a dot, that character is skipped. The input should only
757 be successfully terminated by CR LF . CR LF unless it is local (non-network)
758 SMTP, in which case the CRs are optional, but...
760 FUDGE: It seems that sites on the net send out messages with just LF
761 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
762 we make the CRs optional in all cases.
764 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
765 well, so that there are no CRs in spooled messages. However, the message
766 terminating dot is not recognized between two bare CRs.
769 fout a FILE to which to write the message; NULL if skipping
771 Returns: One of the END_xxx values indicating why it stopped reading
775 read_message_data_smtp(FILE *fout)
779 register int linelength = 0;
781 while ((ch = (receive_getc)()) != EOF)
783 if (ch == 0) body_zerocount++;
786 case 0: /* After LF or CRLF */
790 continue; /* Don't ever write . after LF */
794 /* Else fall through to handle as normal uschar. */
796 case 1: /* Normal state */
801 if (linelength > max_received_linelength)
802 max_received_linelength = linelength;
812 case 2: /* After (unwritten) CR */
814 if (linelength > max_received_linelength)
815 max_received_linelength = linelength;
824 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
825 (void) cutthrough_put_nl();
826 if (ch != '\r') ch_state = 1; else continue;
830 case 3: /* After [CR] LF . */
838 /* The dot was removed at state 3. For a doubled dot, here, reinstate
839 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
840 and to file below. */
844 (void) cutthrough_puts(&c, 1);
849 case 4: /* After [CR] LF . CR */
850 if (ch == '\n') return END_DOT;
853 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
854 (void) cutthrough_put_nl();
864 /* Add the character to the spool file, unless skipping; then loop for the
871 if (fputc(ch, fout) == EOF) return END_WERROR;
872 if (message_size > thismessage_size_limit) return END_SIZE;
875 (void) cutthrough_put_nl();
879 (void) cutthrough_puts(&c, 1);
883 /* Fall through here if EOF encountered. This indicates some kind of error,
884 since a correct message is terminated by [CR] LF . [CR] LF. */
892 /*************************************************
893 * Swallow SMTP message *
894 *************************************************/
896 /* This function is called when there has been some kind of error while reading
897 an SMTP message, and the remaining data may need to be swallowed. It is global
898 because it is called from smtp_closedown() to shut down an incoming call
901 Argument: a FILE from which to read the message
906 receive_swallow_smtp(void)
908 if (message_ended >= END_NOTENDED)
909 message_ended = read_message_data_smtp(NULL);
914 /*************************************************
915 * Handle lost SMTP connection *
916 *************************************************/
918 /* This function logs connection loss incidents and generates an appropriate
921 Argument: additional data for the message
922 Returns: the SMTP response
926 handle_lost_connection(uschar *s)
928 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
929 "%s lost while reading message data%s", smtp_get_connection_info(), s);
930 return US"421 Lost incoming connection";
936 /*************************************************
937 * Handle a non-smtp reception error *
938 *************************************************/
940 /* This function is called for various errors during the reception of non-SMTP
941 messages. It either sends a message to the sender of the problem message, or it
942 writes to the standard error stream.
945 errcode code for moan_to_sender(), identifying the error
946 text1 first message text, passed to moan_to_sender()
947 text2 second message text, used only for stderrr
948 error_rc code to pass to exim_exit if no problem
949 f FILE containing body of message (may be stdin)
950 hptr pointer to instore headers or NULL
952 Returns: calls exim_exit(), which does not return
956 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
957 FILE *f, header_line *hptr)
959 if (error_handling == ERRORS_SENDER)
963 eblock.text1 = text1;
965 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
966 error_rc = EXIT_FAILURE;
969 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
976 /*************************************************
977 * Add header lines set up by ACL *
978 *************************************************/
980 /* This function is called to add the header lines that were set up by
981 statements in an ACL to the list of headers in memory. It is done in two stages
982 like this, because when the ACL for RCPT is running, the other headers have not
983 yet been received. This function is called twice; once just before running the
984 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
985 are visible to the DATA ACL.
987 Originally these header lines were added at the end. Now there is support for
988 three different places: top, bottom, and after the Received: header(s). There
989 will always be at least one Received: header, even if it is marked deleted, and
990 even if something else has been put in front of it.
993 acl_name text to identify which ACL
999 add_acl_headers(int where, uschar *acl_name)
1001 header_line *h, *next;
1002 header_line *last_received = NULL;
1006 case ACL_WHERE_DKIM:
1007 case ACL_WHERE_MIME:
1008 case ACL_WHERE_DATA:
1009 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1011 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1012 " will not take effect on cutthrough deliveries");
1017 if (acl_removed_headers != NULL)
1019 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1021 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1023 const uschar * list = acl_removed_headers;
1024 int sep = ':'; /* This is specified as a colon-separated list */
1028 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1029 if (header_testname(h, s, Ustrlen(s), FALSE))
1031 h->type = htype_old;
1032 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1035 acl_removed_headers = NULL;
1036 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1039 if (acl_added_headers == NULL) return;
1040 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1042 for (h = acl_added_headers; h != NULL; h = next)
1049 h->next = header_list;
1051 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1055 if (last_received == NULL)
1057 last_received = header_list;
1058 while (!header_testname(last_received, US"Received", 8, FALSE))
1059 last_received = last_received->next;
1060 while (last_received->next != NULL &&
1061 header_testname(last_received->next, US"Received", 8, FALSE))
1062 last_received = last_received->next;
1064 h->next = last_received->next;
1065 last_received->next = h;
1066 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1070 /* add header before any header which is NOT Received: or Resent- */
1071 last_received = header_list;
1072 while ( (last_received->next != NULL) &&
1073 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1074 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1075 last_received = last_received->next;
1076 /* last_received now points to the last Received: or Resent-* header
1077 in an uninterrupted chain of those header types (seen from the beginning
1078 of all headers. Our current header must follow it. */
1079 h->next = last_received->next;
1080 last_received->next = h;
1081 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1086 header_last->next = h;
1090 if (h->next == NULL) header_last = h;
1092 /* Check for one of the known header types (From:, To:, etc.) though in
1093 practice most added headers are going to be "other". Lower case
1094 identification letters are never stored with the header; they are used
1095 for existence tests when messages are received. So discard any lower case
1098 h->type = header_checkname(h, FALSE);
1099 if (h->type >= 'a') h->type = htype_other;
1101 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1104 acl_added_headers = NULL;
1105 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1110 /*************************************************
1111 * Add host information for log line *
1112 *************************************************/
1114 /* Called for acceptance and rejecting log lines. This adds information about
1115 the calling host to a string that is being built dynamically.
1118 s the dynamic string
1119 sizeptr points to the size variable
1120 ptrptr points to the pointer variable
1122 Returns: the extended string
1126 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1128 if (sender_fullhost)
1130 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1131 s = string_cat(s, sizeptr, ptrptr, US" DS");
1132 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1133 if (LOGGING(incoming_interface) && interface_address != NULL)
1135 s = string_cat(s, sizeptr, ptrptr,
1136 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1139 if (sender_ident != NULL)
1140 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1141 if (received_protocol != NULL)
1142 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1148 #ifdef WITH_CONTENT_SCAN
1150 /*************************************************
1151 * Run the MIME ACL on a message *
1152 *************************************************/
1154 /* This code is in a subroutine so that it can be used for both SMTP
1155 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1158 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1159 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1160 smtp_reply_ptr Where SMTP reply is being built
1161 blackholed_by_ptr Where "blackholed by" message is being built
1163 Returns: TRUE to carry on; FALSE to abandon the message
1167 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1168 uschar **blackholed_by_ptr)
1171 uschar rfc822_file_path[2048];
1172 unsigned long mbox_size;
1173 header_line *my_headerlist;
1174 uschar *user_msg, *log_msg;
1175 int mime_part_count_buffer = -1;
1178 memset(CS rfc822_file_path,0,2048);
1180 /* check if it is a MIME message */
1181 my_headerlist = header_list;
1182 while (my_headerlist != NULL)
1184 /* skip deleted headers */
1185 if (my_headerlist->type == '*')
1187 my_headerlist = my_headerlist->next;
1190 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1192 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1195 my_headerlist = my_headerlist->next;
1198 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1202 /* make sure the eml mbox file is spooled up */
1203 mbox_file = spool_mbox(&mbox_size, NULL);
1204 if (mbox_file == NULL) {
1205 /* error while spooling */
1206 log_write(0, LOG_MAIN|LOG_PANIC,
1207 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1208 Uunlink(spool_name);
1210 #ifdef EXPERIMENTAL_DCC
1213 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1214 message_id[0] = 0; /* Indicate no message accepted */
1215 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1216 return FALSE; /* Indicate skip to end of receive function */
1222 mime_part_count = -1;
1223 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1224 (void)fclose(mbox_file);
1226 if (Ustrlen(rfc822_file_path) > 0)
1228 mime_part_count = mime_part_count_buffer;
1230 if (unlink(CS rfc822_file_path) == -1)
1232 log_write(0, LOG_PANIC,
1233 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1238 /* check if we must check any message/rfc822 attachments */
1241 uschar temp_path[1024];
1242 struct dirent * entry;
1245 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1246 spool_directory, message_id);
1248 tempdir = opendir(CS temp_path);
1251 if (!(entry = readdir(tempdir)))
1253 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1255 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1256 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1257 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1266 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1268 /* set RFC822 expansion variable */
1270 mime_part_count_buffer = mime_part_count;
1271 goto MIME_ACL_CHECK;
1273 log_write(0, LOG_PANIC,
1274 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1275 unlink(CS rfc822_file_path);
1280 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1283 recipients_count = 0;
1284 *blackholed_by_ptr = US"MIME ACL";
1288 Uunlink(spool_name);
1290 #ifdef EXPERIMENTAL_DCC
1294 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1296 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1297 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1299 message_id[0] = 0; /* Indicate no message accepted */
1300 return FALSE; /* Cause skip to end of receive function */
1306 #endif /* WITH_CONTENT_SCAN */
1311 received_header_gen(void)
1315 header_line *received_header= header_list;
1317 timestamp = expand_string(US"${tod_full}");
1318 if (recipients_count == 1) received_for = recipients_list[0].address;
1319 received = expand_string(received_header_text);
1320 received_for = NULL;
1324 if(spool_name[0] != 0)
1325 Uunlink(spool_name); /* Lose the data file */
1326 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1327 "(received_header_text) failed: %s", string_printing(received_header_text),
1328 expand_string_message);
1331 /* The first element on the header chain is reserved for the Received header,
1332 so all we have to do is fill in the text pointer, and set the type. However, if
1333 the result of the expansion is an empty string, we leave the header marked as
1334 "old" so as to refrain from adding a Received header. */
1336 if (received[0] == 0)
1338 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1339 received_header->type = htype_old;
1343 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1344 received_header->type = htype_received;
1347 received_header->slen = Ustrlen(received_header->text);
1349 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1350 received_header->type, received_header->text);
1355 /*************************************************
1357 *************************************************/
1359 /* Receive a message on the given input, and put it into a pair of spool files.
1360 Either a non-null list of recipients, or the extract flag will be true, or
1361 both. The flag sender_local is true for locally generated messages. The flag
1362 submission_mode is true if an ACL has obeyed "control = submission". The flag
1363 suppress_local_fixups is true if an ACL has obeyed "control =
1364 suppress_local_fixups" or -G was passed on the command-line.
1365 The flag smtp_input is true if the message is to be
1366 handled using SMTP conventions about termination and lines starting with dots.
1367 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1369 If a message was successfully read, message_id[0] will be non-zero.
1371 The general actions of this function are:
1373 . Read the headers of the message (if any) into a chain of store
1376 . If there is a "sender:" header and the message is locally originated,
1377 throw it away, unless the caller is trusted, or unless
1378 active_local_sender_retain is set - which can only happen if
1379 active_local_from_check is false.
1381 . If recipients are to be extracted from the message, build the
1382 recipients list from the headers, removing any that were on the
1383 original recipients list (unless extract_addresses_remove_arguments is
1384 false), and at the same time, remove any bcc header that may be present.
1386 . Get the spool file for the data, sort out its unique name, open
1387 and lock it (but don't give it the name yet).
1389 . Generate a "Message-Id" header if the message doesn't have one, for
1390 locally-originated messages.
1392 . Generate a "Received" header.
1394 . Ensure the recipients list is fully qualified and rewritten if necessary.
1396 . If there are any rewriting rules, apply them to the sender address
1397 and also to the headers.
1399 . If there is no from: header, generate one, for locally-generated messages
1400 and messages in "submission mode" only.
1402 . If the sender is local, check that from: is correct, and if not, generate
1403 a Sender: header, unless message comes from a trusted caller, or this
1404 feature is disabled by active_local_from_check being false.
1406 . If there is no "date" header, generate one, for locally-originated
1407 or submission mode messages only.
1409 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1410 dot_ends mode, to the data file. Leave it open, to hold the lock.
1412 . Write the envelope and the headers to a new file.
1414 . Set the name for the header file; close it.
1416 . Set the name for the data file; close it.
1418 Because this function can potentially be called many times in a single
1419 SMTP connection, all store should be got by store_get(), so that it will be
1420 automatically retrieved after the message is accepted.
1422 FUDGE: It seems that sites on the net send out messages with just LF
1423 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1424 we make the CRs optional in all cases.
1426 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1427 new regime is now in place in which bare CRs in header lines are turned into LF
1428 followed by a space, so as not to terminate the header line.
1430 February 2004: A bare LF in a header line in a message whose first line was
1431 terminated by CRLF is treated in the same way as a bare CR.
1434 extract_recip TRUE if recipients are to be extracted from the message's
1437 Returns: TRUE there are more messages to be read (SMTP input)
1438 FALSE there are no more messages to be read (non-SMTP input
1439 or SMTP connection collapsed, or other failure)
1441 When reading a message for filter testing, the returned value indicates
1442 whether the headers (which is all that is read) were terminated by '.' or
1446 receive_msg(BOOL extract_recip)
1451 int process_info_len = Ustrlen(process_info);
1452 int error_rc = (error_handling == ERRORS_SENDER)?
1453 errors_sender_rc : EXIT_FAILURE;
1454 int header_size = 256;
1455 int start, end, domain, size, sptr;
1458 int prevlines_length = 0;
1460 register int ptr = 0;
1462 BOOL contains_resent_headers = FALSE;
1463 BOOL extracted_ignored = FALSE;
1464 BOOL first_line_ended_crlf = TRUE_UNSET;
1465 BOOL smtp_yield = TRUE;
1468 BOOL resents_exist = FALSE;
1469 uschar *resent_prefix = US"";
1470 uschar *blackholed_by = NULL;
1471 uschar *blackhole_log_msg = US"";
1472 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1475 error_block *bad_addresses = NULL;
1477 uschar *frozen_by = NULL;
1478 uschar *queued_by = NULL;
1481 struct stat statbuf;
1483 /* Final message to give to SMTP caller, and messages from ACLs */
1485 uschar *smtp_reply = NULL;
1486 uschar *user_msg, *log_msg;
1488 /* Working header pointers */
1490 header_line *h, *next;
1492 /* Flags for noting the existence of certain headers (only one left) */
1494 BOOL date_header_exists = FALSE;
1496 /* Pointers to receive the addresses of headers whose contents we need. */
1498 header_line *from_header = NULL;
1499 header_line *subject_header = NULL;
1500 header_line *msgid_header = NULL;
1501 header_line *received_header;
1503 #ifdef EXPERIMENTAL_DMARC
1505 #endif /* EXPERIMENTAL_DMARC */
1507 /* Variables for use when building the Received: header. */
1512 /* Release any open files that might have been cached while preparing to
1513 accept the message - e.g. by verifying addresses - because reading a message
1514 might take a fair bit of real time. */
1518 /* Extracting the recipient list from an input file is incompatible with
1519 cutthrough delivery with the no-spool option. It shouldn't be possible
1520 to set up the combination, but just in case kill any ongoing connection. */
1521 if (extract_recip || !smtp_input)
1522 cancel_cutthrough_connection("not smtp input");
1524 /* Initialize the chain of headers by setting up a place-holder for Received:
1525 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1526 pointing to the end of the chain to make adding headers simple. */
1528 received_header = header_list = header_last = store_get(sizeof(header_line));
1529 header_list->next = NULL;
1530 header_list->type = htype_old;
1531 header_list->text = NULL;
1532 header_list->slen = 0;
1534 /* Control block for the next header to be read. */
1536 next = store_get(sizeof(header_line));
1537 next->text = store_get(header_size);
1539 /* Initialize message id to be null (indicating no message read), and the
1540 header names list to be the normal list. Indicate there is no data file open
1541 yet, initialize the size and warning count, and deal with no size limit. */
1549 received_count = 1; /* For the one we will add */
1551 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1553 /* While reading the message, the following counts are computed. */
1555 message_linecount = body_linecount = body_zerocount =
1556 max_received_linelength = 0;
1558 #ifndef DISABLE_DKIM
1559 /* Call into DKIM to set up the context. */
1560 if (smtp_input && !smtp_batched_input && !dkim_disable_verify) dkim_exim_verify_init();
1563 #ifdef EXPERIMENTAL_DMARC
1564 /* initialize libopendmarc */
1565 dmarc_up = dmarc_init();
1568 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1569 ids, and fractions of a second are required. See the comments that precede the
1570 message id creation below. */
1572 (void)gettimeofday(&message_id_tv, NULL);
1574 /* For other uses of the received time we can operate with granularity of one
1575 second, and for that we use the global variable received_time. This is for
1576 things like ultimate message timeouts. */
1578 received_time = message_id_tv.tv_sec;
1580 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1581 happen in the smtp_getc() function when it refills its buffer. */
1583 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1585 /* If not SMTP input, timeout happens only if configured, and we just set a
1586 single timeout for the whole message. */
1588 else if (receive_timeout > 0)
1590 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1591 alarm(receive_timeout);
1594 /* SIGTERM and SIGINT are caught always. */
1596 signal(SIGTERM, data_sigterm_sigint_handler);
1597 signal(SIGINT, data_sigterm_sigint_handler);
1599 /* Header lines in messages are not supposed to be very long, though when
1600 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1601 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1602 storing the header, and extend this as necessary using string_cat().
1604 To cope with total lunacies, impose an upper limit on the length of the header
1605 section of the message, as otherwise the store will fill up. We must also cope
1606 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1607 Folded header lines are joined into one string, leaving the '\n' characters
1608 inside them, so that writing them out reproduces the input.
1610 Loop for each character of each header; the next structure for chaining the
1611 header is set up already, with ptr the offset of the next character in
1616 int ch = (receive_getc)();
1618 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1619 SMTP must have a correct "." terminator. */
1621 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1623 smtp_reply = handle_lost_connection(US" (header)");
1625 goto TIDYUP; /* Skip to end of function */
1628 /* See if we are at the current header's size limit - there must be at least
1629 four bytes left. This allows for the new character plus a zero, plus two for
1630 extra insertions when we are playing games with dots and carriage returns. If
1631 we are at the limit, extend the text buffer. This could have been done
1632 automatically using string_cat() but because this is a tightish loop storing
1633 only one character at a time, we choose to do it inline. Normally
1634 store_extend() will be able to extend the block; only at the end of a big
1635 store block will a copy be needed. To handle the case of very long headers
1636 (and sometimes lunatic messages can have ones that are 100s of K long) we
1637 call store_release() for strings that have been copied - if the string is at
1638 the start of a block (and therefore the only thing in it, because we aren't
1639 doing any other gets), the block gets freed. We can only do this because we
1640 know there are no other calls to store_get() going on. */
1642 if (ptr >= header_size - 4)
1644 int oldsize = header_size;
1645 /* header_size += 256; */
1647 if (!store_extend(next->text, oldsize, header_size))
1649 uschar *newtext = store_get(header_size);
1650 memcpy(newtext, next->text, ptr);
1651 store_release(next->text);
1652 next->text = newtext;
1656 /* Cope with receiving a binary zero. There is dispute about whether
1657 these should be allowed in RFC 822 messages. The middle view is that they
1658 should not be allowed in headers, at least. Exim takes this attitude at
1659 the moment. We can't just stomp on them here, because we don't know that
1660 this line is a header yet. Set a flag to cause scanning later. */
1662 if (ch == 0) had_zero++;
1664 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1665 those from data files use just LF. Treat LF in local SMTP input as a
1666 terminator too. Treat EOF as a line terminator always. */
1668 if (ch == EOF) goto EOL;
1670 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1671 other MTAs accept this. We are therefore forced into this "liberalisation"
1672 too, so we accept LF as a line terminator whatever the source of the message.
1673 However, if the first line of the message ended with a CRLF, we treat a bare
1674 LF specially by inserting a white space after it to ensure that the header
1675 line is not terminated. */
1679 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1680 else if (first_line_ended_crlf) receive_ungetc(' ');
1684 /* This is not the end of the line. If this is SMTP input and this is
1685 the first character in the line and it is a "." character, ignore it.
1686 This implements the dot-doubling rule, though header lines starting with
1687 dots aren't exactly common. They are legal in RFC 822, though. If the
1688 following is CRLF or LF, this is the line that that terminates the
1689 entire message. We set message_ended to indicate this has happened (to
1690 prevent further reading), and break out of the loop, having freed the
1691 empty header, and set next = NULL to indicate no data line. */
1693 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1695 ch = (receive_getc)();
1698 ch = (receive_getc)();
1702 ch = '\r'; /* Revert to CR */
1707 message_ended = END_DOT;
1710 break; /* End character-reading loop */
1713 /* For non-SMTP input, the dot at the start of the line was really a data
1714 character. What is now in ch is the following character. We guaranteed
1715 enough space for this above. */
1719 next->text[ptr++] = '.';
1724 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1725 remember this case if this is the first line ending. */
1729 ch = (receive_getc)();
1732 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1736 /* Otherwise, put back the character after CR, and turn the bare CR
1739 ch = (receive_ungetc)(ch);
1740 next->text[ptr++] = '\n';
1745 /* We have a data character for the header line. */
1747 next->text[ptr++] = ch; /* Add to buffer */
1748 message_size++; /* Total message size so far */
1750 /* Handle failure due to a humungously long header section. The >= allows
1751 for the terminating \n. Add what we have so far onto the headers list so
1752 that it gets reflected in any error message, and back up the just-read
1755 if (message_size >= header_maxsize)
1757 next->text[ptr] = 0;
1759 next->type = htype_other;
1761 header_last->next = next;
1764 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1765 "%s (more than %d characters): message abandoned",
1766 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1770 smtp_reply = US"552 Message header is ridiculously long";
1771 receive_swallow_smtp();
1772 goto TIDYUP; /* Skip to end of function */
1777 give_local_error(ERRMESS_VLONGHEADER,
1778 string_sprintf("message header longer than %d characters received: "
1779 "message not accepted", header_maxsize), US"", error_rc, stdin,
1781 /* Does not return */
1785 continue; /* With next input character */
1787 /* End of header line reached */
1791 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1793 receive_linecount++;
1794 message_linecount++;
1796 /* Keep track of maximum line length */
1798 if (ptr - prevlines_length > max_received_linelength)
1799 max_received_linelength = ptr - prevlines_length;
1800 prevlines_length = ptr + 1;
1802 /* Now put in the terminating newline. There is always space for
1803 at least two more characters. */
1805 next->text[ptr++] = '\n';
1808 /* A blank line signals the end of the headers; release the unwanted
1809 space and set next to NULL to indicate this. */
1818 /* There is data in the line; see if the next input character is a
1819 whitespace character. If it is, we have a continuation of this header line.
1820 There is always space for at least one character at this point. */
1824 int nextch = (receive_getc)();
1825 if (nextch == ' ' || nextch == '\t')
1827 next->text[ptr++] = nextch;
1829 continue; /* Iterate the loop */
1831 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1832 else ch = EOF; /* Cause main loop to exit at end */
1835 /* We have got to the real line end. Terminate the string and release store
1836 beyond it. If it turns out to be a real header, internal binary zeros will
1837 be squashed later. */
1839 next->text[ptr] = 0;
1841 store_reset(next->text + ptr + 1);
1843 /* Check the running total size against the overall message size limit. We
1844 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1845 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1846 headers - the code to read the body will then also hit the buffer. */
1848 if (message_size > thismessage_size_limit) break;
1850 /* A line that is not syntactically correct for a header also marks
1851 the end of the headers. In this case, we leave next containing the
1852 first data line. This might actually be several lines because of the
1853 continuation logic applied above, but that doesn't matter.
1855 It turns out that smail, and presumably sendmail, accept leading lines
1858 From ph10 Fri Jan 5 12:35 GMT 1996
1860 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1861 find any documentation of this, but for compatibility it had better be
1862 accepted. Exim restricts it to the case of non-smtp messages, and
1863 treats it as an alternative to the -f command line option. Thus it is
1864 ignored except for trusted users or filter testing. Otherwise it is taken
1865 as the sender address, unless -f was used (sendmail compatibility).
1867 It further turns out that some UUCPs generate the From_line in a different
1870 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1872 The regex for matching these things is now capable of recognizing both
1873 formats (including 2- and 4-digit years in the latter). In fact, the regex
1874 is now configurable, as is the expansion string to fish out the sender.
1876 Even further on it has been discovered that some broken clients send
1877 these lines in SMTP messages. There is now an option to ignore them from
1878 specified hosts or networks. Sigh. */
1880 if (header_last == header_list &&
1883 (sender_host_address != NULL &&
1884 verify_check_host(&ignore_fromline_hosts) == OK)
1886 (sender_host_address == NULL && ignore_fromline_local)
1888 regex_match_and_setup(regex_From, next->text, 0, -1))
1890 if (!sender_address_forced)
1892 uschar *uucp_sender = expand_string(uucp_from_sender);
1893 if (uucp_sender == NULL)
1895 log_write(0, LOG_MAIN|LOG_PANIC,
1896 "expansion of \"%s\" failed after matching "
1897 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1901 int start, end, domain;
1903 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1904 &start, &end, &domain, TRUE);
1905 if (newsender != NULL)
1907 if (domain == 0 && newsender[0] != 0)
1908 newsender = rewrite_address_qualify(newsender, FALSE);
1910 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
1912 sender_address = newsender;
1914 if (trusted_caller || filter_test != FTEST_NONE)
1916 authenticated_sender = NULL;
1917 originator_name = US"";
1918 sender_local = FALSE;
1921 if (filter_test != FTEST_NONE)
1922 printf("Sender taken from \"From \" line\n");
1929 /* Not a leading "From " line. Check to see if it is a valid header line.
1930 Header names may contain any non-control characters except space and colon,
1935 uschar *p = next->text;
1937 /* If not a valid header line, break from the header reading loop, leaving
1938 next != NULL, indicating that it holds the first line of the body. */
1940 if (isspace(*p)) break;
1941 while (mac_isgraph(*p) && *p != ':') p++;
1942 while (isspace(*p)) p++;
1945 body_zerocount = had_zero;
1949 /* We have a valid header line. If there were any binary zeroes in
1950 the line, stomp on them here. */
1953 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1955 /* It is perfectly legal to have an empty continuation line
1956 at the end of a header, but it is confusing to humans
1957 looking at such messages, since it looks like a blank line.
1958 Reduce confusion by removing redundant white space at the
1959 end. We know that there is at least one printing character
1960 (the ':' tested for above) so there is no danger of running
1963 p = next->text + ptr - 2;
1966 while (*p == ' ' || *p == '\t') p--;
1967 if (*p != '\n') break;
1968 ptr = (p--) - next->text + 1;
1969 message_size -= next->slen - ptr;
1970 next->text[ptr] = 0;
1974 /* Add the header to the chain */
1976 next->type = htype_other;
1978 header_last->next = next;
1981 /* Check the limit for individual line lengths. This comes after adding to
1982 the chain so that the failing line is reflected if a bounce is generated
1983 (for a local message). */
1985 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1987 log_write(0, LOG_MAIN, "overlong message header line received from "
1988 "%s (more than %d characters): message abandoned",
1989 sender_host_unknown? sender_ident : sender_fullhost,
1990 header_line_maxsize);
1994 smtp_reply = US"552 A message header line is too long";
1995 receive_swallow_smtp();
1996 goto TIDYUP; /* Skip to end of function */
2001 give_local_error(ERRMESS_VLONGHDRLINE,
2002 string_sprintf("message header line longer than %d characters "
2003 "received: message not accepted", header_line_maxsize), US"",
2004 error_rc, stdin, header_list->next);
2005 /* Does not return */
2009 /* Note if any resent- fields exist. */
2011 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2013 resents_exist = TRUE;
2014 resent_prefix = US"Resent-";
2018 /* The line has been handled. If we have hit EOF, break out of the loop,
2019 indicating no pending data line. */
2021 if (ch == EOF) { next = NULL; break; }
2023 /* Set up for the next header */
2026 next = store_get(sizeof(header_line));
2027 next->text = store_get(header_size);
2030 prevlines_length = 0;
2031 } /* Continue, starting to read the next header */
2033 /* At this point, we have read all the headers into a data structure in main
2034 store. The first header is still the dummy placeholder for the Received: header
2035 we are going to generate a bit later on. If next != NULL, it contains the first
2036 data line - which terminated the headers before reaching a blank line (not the
2041 debug_printf(">>Headers received:\n");
2042 for (h = header_list->next; h != NULL; h = h->next)
2043 debug_printf("%s", h->text);
2047 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2048 is dropped immediately after valid headers, the next thing we will see is EOF.
2049 We must test for this specially, as further down the reading of the data is
2050 skipped if already at EOF. */
2052 if (smtp_input && (receive_feof)())
2054 smtp_reply = handle_lost_connection(US" (after header)");
2056 goto TIDYUP; /* Skip to end of function */
2059 /* If this is a filter test run and no headers were read, output a warning
2060 in case there is a mistake in the test message. */
2062 if (filter_test != FTEST_NONE && header_list->next == NULL)
2063 printf("Warning: no message headers read\n");
2066 /* Scan the headers to identify them. Some are merely marked for later
2067 processing; some are dealt with here. */
2069 for (h = header_list->next; h != NULL; h = h->next)
2071 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2072 if (is_resent) contains_resent_headers = TRUE;
2074 switch (header_checkname(h, is_resent))
2077 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2081 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2084 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2087 if (!resents_exist || is_resent) date_header_exists = TRUE;
2090 /* Same comments as about Return-Path: below. */
2092 case htype_delivery_date:
2093 if (delivery_date_remove) h->type = htype_old;
2096 /* Same comments as about Return-Path: below. */
2098 case htype_envelope_to:
2099 if (envelope_to_remove) h->type = htype_old;
2102 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2103 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2104 header consists of just the login id of the user who called Exim, rewrite
2105 it with the gecos field first. Apply this rule to Resent-From: if there
2106 are resent- fields. */
2109 h->type = htype_from;
2110 if (!resents_exist || is_resent)
2116 uschar *s = Ustrchr(h->text, ':') + 1;
2117 while (isspace(*s)) s++;
2118 len = h->slen - (s - h->text) - 1;
2119 if (Ustrlen(originator_login) == len &&
2120 strncmpic(s, originator_login, len) == 0)
2122 uschar *name = is_resent? US"Resent-From" : US"From";
2123 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2124 originator_login, qualify_domain_sender);
2125 from_header = header_last;
2126 h->type = htype_old;
2127 DEBUG(D_receive|D_rewrite)
2128 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2134 /* Identify the Message-id: header for generating "in-reply-to" in the
2135 autoreply transport. For incoming logging, save any resent- value. In both
2136 cases, take just the first of any multiples. */
2139 if (msgid_header == NULL && (!resents_exist || is_resent))
2146 /* Flag all Received: headers */
2148 case htype_received:
2149 h->type = htype_received;
2153 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2155 case htype_reply_to:
2156 h->type = htype_reply_to;
2159 /* The Return-path: header is supposed to be added to messages when
2160 they leave the SMTP system. We shouldn't receive messages that already
2161 contain Return-path. However, since Exim generates Return-path: on
2162 local delivery, resent messages may well contain it. We therefore
2163 provide an option (which defaults on) to remove any Return-path: headers
2164 on input. Removal actually means flagging as "old", which prevents the
2165 header being transmitted with the message. */
2167 case htype_return_path:
2168 if (return_path_remove) h->type = htype_old;
2170 /* If we are testing a mail filter file, use the value of the
2171 Return-Path: header to set up the return_path variable, which is not
2172 otherwise set. However, remove any <> that surround the address
2173 because the variable doesn't have these. */
2175 if (filter_test != FTEST_NONE)
2177 uschar *start = h->text + 12;
2178 uschar *end = start + Ustrlen(start);
2179 while (isspace(*start)) start++;
2180 while (end > start && isspace(end[-1])) end--;
2181 if (*start == '<' && end[-1] == '>')
2186 return_path = string_copyn(start, end - start);
2187 printf("Return-path taken from \"Return-path:\" header line\n");
2191 /* If there is a "Sender:" header and the message is locally originated,
2192 and from an untrusted caller and suppress_local_fixups is not set, or if we
2193 are in submission mode for a remote message, mark it "old" so that it will
2194 not be transmitted with the message, unless active_local_sender_retain is
2195 set. (This can only be true if active_local_from_check is false.) If there
2196 are any resent- headers in the message, apply this rule to Resent-Sender:
2197 instead of Sender:. Messages with multiple resent- header sets cannot be
2198 tidily handled. (For this reason, at least one MUA - Pine - turns old
2199 resent- headers into X-resent- headers when resending, leaving just one
2203 h->type = ((!active_local_sender_retain &&
2205 (sender_local && !trusted_caller && !suppress_local_fixups)
2209 (!resents_exist||is_resent))?
2210 htype_old : htype_sender;
2213 /* Remember the Subject: header for logging. There is no Resent-Subject */
2219 /* "To:" gets flagged, and the existence of a recipient header is noted,
2220 whether it's resent- or not. */
2225 to_or_cc_header_exists = TRUE;
2231 /* Extract recipients from the headers if that is required (the -t option).
2232 Note that this is documented as being done *before* any address rewriting takes
2233 place. There are two possibilities:
2235 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2236 recipients already listed are to be REMOVED from the message. Smail 3 works
2237 like this. We need to build a non-recipients tree for that list, because in
2238 subsequent processing this data is held in a tree and that's what the
2239 spool_write_header() function expects. Make sure that non-recipient addresses
2240 are fully qualified and rewritten if necessary.
2242 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2243 those in the command line arguments (and it is rumoured some other MTAs do
2244 this). Therefore, there is an option to make Exim behave this way.
2246 *** Notes on "Resent-" header lines ***
2248 The presence of resent-headers in the message makes -t horribly ambiguous.
2249 Experiments with sendmail showed that it uses recipients for all resent-
2250 headers, totally ignoring the concept of "sets of resent- headers" as described
2251 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2252 with all the addresses in one instance of each header.
2254 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2255 error for -t if there were resent- headers in the message. However, after a
2256 discussion on the mailing list, I've learned that there are MUAs that use
2257 resent- headers with -t, and also that the stuff about sets of resent- headers
2258 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2259 message with -t and resent- header lines makes sure that only *its* resent-
2260 headers are present; previous ones are often renamed as X-resent- for example.
2262 Consequently, Exim has been changed so that, if any resent- header lines are
2263 present, the recipients are taken from all of the appropriate resent- lines,
2264 and not from the ordinary To:, Cc:, etc. */
2269 error_block **bnext = &bad_addresses;
2271 if (extract_addresses_remove_arguments)
2273 while (recipients_count-- > 0)
2275 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2276 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2277 tree_add_nonrecipient(s);
2279 recipients_list = NULL;
2280 recipients_count = recipients_list_max = 0;
2283 /* Now scan the headers */
2285 for (h = header_list->next; h != NULL; h = h->next)
2287 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2288 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2290 uschar *s = Ustrchr(h->text, ':') + 1;
2291 while (isspace(*s)) s++;
2293 parse_allow_group = TRUE; /* Allow address group syntax */
2297 uschar *ss = parse_find_address_end(s, FALSE);
2298 uschar *recipient, *errmess, *p, *pp;
2299 int start, end, domain;
2301 /* Check on maximum */
2303 if (recipients_max > 0 && ++rcount > recipients_max)
2305 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2306 US"message rejected: ", error_rc, stdin, NULL);
2307 /* Does not return */
2310 /* Make a copy of the address, and remove any internal newlines. These
2311 may be present as a result of continuations of the header line. The
2312 white space that follows the newline must not be removed - it is part
2315 pp = recipient = store_get(ss - s + 1);
2316 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2321 BOOL b = allow_utf8_domains;
2322 allow_utf8_domains = TRUE;
2324 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2328 if (string_is_utf8(recipient))
2329 message_smtputf8 = TRUE;
2331 allow_utf8_domains = b;
2335 /* Keep a list of all the bad addresses so we can send a single
2336 error message at the end. However, an empty address is not an error;
2337 just ignore it. This can come from an empty group list like
2339 To: Recipients of list:;
2341 If there are no recipients at all, an error will occur later. */
2343 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2345 int len = Ustrlen(s);
2346 error_block *b = store_get(sizeof(error_block));
2347 while (len > 0 && isspace(s[len-1])) len--;
2349 b->text1 = string_printing(string_copyn(s, len));
2355 /* If the recipient is already in the nonrecipients tree, it must
2356 have appeared on the command line with the option extract_addresses_
2357 remove_arguments set. Do not add it to the recipients, and keep a note
2358 that this has happened, in order to give a better error if there are
2359 no recipients left. */
2361 else if (recipient != NULL)
2363 if (tree_search(tree_nonrecipients, recipient) == NULL)
2364 receive_add_recipient(recipient, -1);
2366 extracted_ignored = TRUE;
2369 /* Move on past this address */
2371 s = ss + (*ss? 1:0);
2372 while (isspace(*s)) s++;
2373 } /* Next address */
2375 parse_allow_group = FALSE; /* Reset group syntax flags */
2376 parse_found_group = FALSE;
2378 /* If this was the bcc: header, mark it "old", which means it
2379 will be kept on the spool, but not transmitted as part of the
2382 if (h->type == htype_bcc) h->type = htype_old;
2383 } /* For appropriate header line */
2384 } /* For each header line */
2388 /* Now build the unique message id. This has changed several times over the
2389 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2390 Retaining all the history in the comment has become too unwieldy - read
2391 previous release sources if you want it.
2393 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2394 The first part is the current time, in seconds. The second part is the current
2395 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2396 can hold a number in the range 0-3843. It used to be a computed sequence
2397 number, but is now the fractional component of the current time in units of
2398 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2399 received, Exim ensures that the timer has ticked at the appropriate level
2400 before proceeding, to avoid duplication if the pid happened to be re-used
2401 within the same time period. It seems likely that most messages will take at
2402 least half a millisecond to be received, so no delay will normally be
2403 necessary. At least for some time...
2405 There is a modification when localhost_number is set. Formerly this was allowed
2406 to be as large as 255. Now it is restricted to the range 0-16, and the final
2407 component of the message id becomes (localhost_number * 200) + fractional time
2408 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2410 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2411 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2412 still allows the tttttt field to hold a large enough number to last for some
2413 more decades, and the final two-digit field can hold numbers up to 1295, which
2414 is enough for milliseconds (instead of 1/2000 of a second).
2416 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2417 pid, so it is probably safe because pids have to be positive. The
2418 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2419 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2421 Note that string_base62() returns its data in a static storage block, so it
2422 must be copied before calling string_base62() again. It always returns exactly
2425 There doesn't seem to be anything in the RFC which requires a message id to
2426 start with a letter, but Smail was changed to ensure this. The external form of
2427 the message id (as supplied by string expansion) therefore starts with an
2428 additional leading 'E'. The spool file names do not include this leading
2429 letter and it is not used internally.
2431 NOTE: If ever the format of message ids is changed, the regular expression for
2432 checking that a string is in this format must be updated in a corresponding
2433 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2434 must also be changed to reflect the correct string length. Then, of course,
2435 other programs that rely on the message id format will need updating too. */
2437 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2438 message_id[6] = '-';
2439 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2441 /* Deal with the case where the host number is set. The value of the number was
2442 checked when it was read, to ensure it isn't too big. The timing granularity is
2443 left in id_resolution so that an appropriate wait can be done after receiving
2444 the message, if necessary (we hope it won't be). */
2446 if (host_number_string != NULL)
2448 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2449 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2450 string_base62((long int)(
2451 host_number * (1000000/id_resolution) +
2452 message_id_tv.tv_usec/id_resolution)) + 4);
2455 /* Host number not set: final field is just the fractional time at an
2456 appropriate resolution. */
2460 id_resolution = (BASE_62 == 62)? 500 : 1000;
2461 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2462 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2465 /* Add the current message id onto the current process info string if
2468 (void)string_format(process_info + process_info_len,
2469 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2471 /* If we are using multiple input directories, set up the one for this message
2472 to be the least significant base-62 digit of the time of arrival. Otherwise
2473 ensure that it is an empty string. */
2475 message_subdir[0] = split_spool_directory? message_id[5] : 0;
2477 /* Now that we have the message-id, if there is no message-id: header, generate
2478 one, but only for local (without suppress_local_fixups) or submission mode
2479 messages. This can be user-configured if required, but we had better flatten
2480 any illegal characters therein. */
2482 if (msgid_header == NULL &&
2483 ((sender_host_address == NULL && !suppress_local_fixups)
2484 || submission_mode))
2487 uschar *id_text = US"";
2488 uschar *id_domain = primary_hostname;
2490 /* Permit only letters, digits, dots, and hyphens in the domain */
2492 if (message_id_domain != NULL)
2494 uschar *new_id_domain = expand_string(message_id_domain);
2495 if (new_id_domain == NULL)
2497 if (!expand_string_forcedfail)
2498 log_write(0, LOG_MAIN|LOG_PANIC,
2499 "expansion of \"%s\" (message_id_header_domain) "
2500 "failed: %s", message_id_domain, expand_string_message);
2502 else if (*new_id_domain != 0)
2504 id_domain = new_id_domain;
2505 for (p = id_domain; *p != 0; p++)
2506 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2510 /* Permit all characters except controls and RFC 2822 specials in the
2511 additional text part. */
2513 if (message_id_text != NULL)
2515 uschar *new_id_text = expand_string(message_id_text);
2516 if (new_id_text == NULL)
2518 if (!expand_string_forcedfail)
2519 log_write(0, LOG_MAIN|LOG_PANIC,
2520 "expansion of \"%s\" (message_id_header_text) "
2521 "failed: %s", message_id_text, expand_string_message);
2523 else if (*new_id_text != 0)
2525 id_text = new_id_text;
2526 for (p = id_text; *p != 0; p++)
2527 if (mac_iscntrl_or_special(*p)) *p = '-';
2531 /* Add the header line
2532 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2533 * appended, to preserve classical expectations of header ordering. */
2535 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2536 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2537 (*id_text == 0)? "" : ".", id_text, id_domain);
2540 /* If we are to log recipients, keep a copy of the raw ones before any possible
2541 rewriting. Must copy the count, because later ACLs and the local_scan()
2542 function may mess with the real recipients. */
2544 if (LOGGING(received_recipients))
2546 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2547 for (i = 0; i < recipients_count; i++)
2548 raw_recipients[i] = string_copy(recipients_list[i].address);
2549 raw_recipients_count = recipients_count;
2552 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2553 recipients will get here only if the conditions were right (allow_unqualified_
2554 recipient is TRUE). */
2556 for (i = 0; i < recipients_count; i++)
2557 recipients_list[i].address =
2558 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2559 global_rewrite_rules, rewrite_existflags);
2561 /* If there is no From: header, generate one for local (without
2562 suppress_local_fixups) or submission_mode messages. If there is no sender
2563 address, but the sender is local or this is a local delivery error, use the
2564 originator login. This shouldn't happen for genuine bounces, but might happen
2565 for autoreplies. The addition of From: must be done *before* checking for the
2566 possible addition of a Sender: header, because untrusted_set_sender allows an
2567 untrusted user to set anything in the envelope (which might then get info
2568 From:) but we still want to ensure a valid Sender: if it is required. */
2570 if (from_header == NULL &&
2571 ((sender_host_address == NULL && !suppress_local_fixups)
2572 || submission_mode))
2574 uschar *oname = US"";
2576 /* Use the originator_name if this is a locally submitted message and the
2577 caller is not trusted. For trusted callers, use it only if -F was used to
2578 force its value or if we have a non-SMTP message for which -f was not used
2579 to set the sender. */
2581 if (sender_host_address == NULL)
2583 if (!trusted_caller || sender_name_forced ||
2584 (!smtp_input && !sender_address_forced))
2585 oname = originator_name;
2588 /* For non-locally submitted messages, the only time we use the originator
2589 name is when it was forced by the /name= option on control=submission. */
2593 if (submission_name != NULL) oname = submission_name;
2596 /* Envelope sender is empty */
2598 if (sender_address[0] == 0)
2600 uschar *fromstart, *fromend;
2602 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2603 oname, (oname[0] == 0)? "" : " <");
2604 fromend = (oname[0] == 0)? US"" : US">";
2606 if (sender_local || local_error_message)
2608 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2609 local_part_quote(originator_login), qualify_domain_sender,
2612 else if (submission_mode && authenticated_id != NULL)
2614 if (submission_domain == NULL)
2616 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2617 local_part_quote(authenticated_id), qualify_domain_sender,
2620 else if (submission_domain[0] == 0) /* empty => whole address set */
2622 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2627 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2628 local_part_quote(authenticated_id), submission_domain,
2631 from_header = header_last; /* To get it checked for Sender: */
2635 /* There is a non-null envelope sender. Build the header using the original
2636 sender address, before any rewriting that might have been done while
2641 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2643 (oname[0] == 0)? "" : " <",
2644 (sender_address_unrewritten == NULL)?
2645 sender_address : sender_address_unrewritten,
2646 (oname[0] == 0)? "" : ">");
2648 from_header = header_last; /* To get it checked for Sender: */
2653 /* If the sender is local (without suppress_local_fixups), or if we are in
2654 submission mode and there is an authenticated_id, check that an existing From:
2655 is correct, and if not, generate a Sender: header, unless disabled. Any
2656 previously-existing Sender: header was removed above. Note that sender_local,
2657 as well as being TRUE if the caller of exim is not trusted, is also true if a
2658 trusted caller did not supply a -f argument for non-smtp input. To allow
2659 trusted callers to forge From: without supplying -f, we have to test explicitly
2660 here. If the From: header contains more than one address, then the call to
2661 parse_extract_address fails, and a Sender: header is inserted, as required. */
2663 if (from_header != NULL &&
2664 (active_local_from_check &&
2665 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2666 (submission_mode && authenticated_id != NULL))
2669 BOOL make_sender = TRUE;
2670 int start, end, domain;
2672 uschar *from_address =
2673 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2674 &start, &end, &domain, FALSE);
2675 uschar *generated_sender_address;
2677 if (submission_mode)
2679 if (submission_domain == NULL)
2681 generated_sender_address = string_sprintf("%s@%s",
2682 local_part_quote(authenticated_id), qualify_domain_sender);
2684 else if (submission_domain[0] == 0) /* empty => full address */
2686 generated_sender_address = string_sprintf("%s",
2691 generated_sender_address = string_sprintf("%s@%s",
2692 local_part_quote(authenticated_id), submission_domain);
2696 generated_sender_address = string_sprintf("%s@%s",
2697 local_part_quote(originator_login), qualify_domain_sender);
2699 /* Remove permitted prefixes and suffixes from the local part of the From:
2700 address before doing the comparison with the generated sender. */
2702 if (from_address != NULL)
2705 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2707 if (at != NULL) *at = 0;
2708 from_address += route_check_prefix(from_address, local_from_prefix);
2709 slen = route_check_suffix(from_address, local_from_suffix);
2712 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2713 from_address += slen;
2715 if (at != NULL) *at = '@';
2717 if (strcmpic(generated_sender_address, from_address) == 0 ||
2718 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2719 make_sender = FALSE;
2722 /* We have to cause the Sender header to be rewritten if there are
2723 appropriate rewriting rules. */
2727 if (submission_mode && submission_name == NULL)
2728 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2729 generated_sender_address);
2731 header_add(htype_sender, "%sSender: %s <%s>\n",
2733 submission_mode? submission_name : originator_name,
2734 generated_sender_address);
2737 /* Ensure that a non-null envelope sender address corresponds to the
2738 submission mode sender address. */
2740 if (submission_mode && sender_address[0] != 0)
2742 if (sender_address_unrewritten == NULL)
2743 sender_address_unrewritten = sender_address;
2744 sender_address = generated_sender_address;
2745 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2746 log_write(L_address_rewrite, LOG_MAIN,
2747 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2748 sender_address_unrewritten, generated_sender_address);
2752 /* If there are any rewriting rules, apply them to the sender address, unless
2753 it has already been rewritten as part of verification for SMTP input. */
2755 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2756 sender_address[0] != 0)
2758 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2759 global_rewrite_rules, rewrite_existflags);
2760 DEBUG(D_receive|D_rewrite)
2761 debug_printf("rewritten sender = %s\n", sender_address);
2765 /* The headers must be run through rewrite_header(), because it ensures that
2766 addresses are fully qualified, as well as applying any rewriting rules that may
2769 Qualification of header addresses in a message from a remote host happens only
2770 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2771 appropriate. For local messages, qualification always happens, unless -bnq is
2772 used to explicitly suppress it. No rewriting is done for an unqualified address
2773 that is left untouched.
2775 We start at the second header, skipping our own Received:. This rewriting is
2776 documented as happening *after* recipient addresses are taken from the headers
2777 by the -t command line option. An added Sender: gets rewritten here. */
2779 for (h = header_list->next; h != NULL; h = h->next)
2781 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2782 rewrite_existflags, TRUE);
2783 if (newh != NULL) h = newh;
2787 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2788 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2789 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2790 exists, this applies to the set of resent- headers rather than the normal set.
2792 The requirement for a recipient header has been removed in RFC 2822. At this
2793 point in the code, earlier versions of Exim added a To: header for locally
2794 submitted messages, and an empty Bcc: header for others. In the light of the
2795 changes in RFC 2822, this was dropped in November 2003. */
2798 /* If there is no date header, generate one if the message originates locally
2799 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2800 submission mode flag is set. Messages without Date: are not valid, but it seems
2801 to be more confusing if Exim adds one to all remotely-originated messages.
2802 As per Message-Id, we prepend if resending, else append.
2805 if (!date_header_exists &&
2806 ((sender_host_address == NULL && !suppress_local_fixups)
2807 || submission_mode))
2808 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2809 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2811 search_tidyup(); /* Free any cached resources */
2813 /* Show the complete set of headers if debugging. Note that the first one (the
2814 new Received:) has not yet been set. */
2818 debug_printf(">>Headers after rewriting and local additions:\n");
2819 for (h = header_list->next; h != NULL; h = h->next)
2820 debug_printf("%c %s", h->type, h->text);
2824 /* The headers are now complete in store. If we are running in filter
2825 testing mode, that is all this function does. Return TRUE if the message
2826 ended with a dot. */
2828 if (filter_test != FTEST_NONE)
2830 process_info[process_info_len] = 0;
2831 return message_ended == END_DOT;
2834 /* Cutthrough delivery:
2835 We have to create the Received header now rather than at the end of reception,
2836 so the timestamp behaviour is a change to the normal case.
2837 XXX Ensure this gets documented XXX.
2838 Having created it, send the headers to the destination. */
2839 if (cutthrough.fd >= 0)
2841 if (received_count > received_headers_max)
2843 cancel_cutthrough_connection("too many headers");
2844 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2845 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2846 "Too many \"Received\" headers",
2848 (sender_fullhost == NULL)? "" : " H=",
2849 (sender_fullhost == NULL)? US"" : sender_fullhost,
2850 (sender_ident == NULL)? "" : " U=",
2851 (sender_ident == NULL)? US"" : sender_ident);
2852 message_id[0] = 0; /* Indicate no message accepted */
2853 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2854 goto TIDYUP; /* Skip to end of function */
2856 received_header_gen();
2857 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2858 (void) cutthrough_headers_send();
2862 /* Open a new spool file for the data portion of the message. We need
2863 to access it both via a file descriptor and a stream. Try to make the
2864 directory if it isn't there. Note re use of sprintf: spool_directory
2865 is checked on input to be < 200 characters long. */
2867 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2869 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2872 if (errno == ENOENT)
2875 sprintf(CS temp, "input/%s", message_subdir);
2876 if (message_subdir[0] == 0) temp[5] = 0;
2877 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2878 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2881 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2882 spool_name, strerror(errno));
2885 /* Make sure the file's group is the Exim gid, and double-check the mode
2886 because the group setting doesn't always get set automatically. */
2888 if (fchown(data_fd, exim_uid, exim_gid))
2889 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
2890 "Failed setting ownership on spool file %s: %s",
2891 spool_name, strerror(errno));
2892 (void)fchmod(data_fd, SPOOL_MODE);
2894 /* We now have data file open. Build a stream for it and lock it. We lock only
2895 the first line of the file (containing the message ID) because otherwise there
2896 are problems when Exim is run under Cygwin (I'm told). See comments in
2897 spool_in.c, where the same locking is done. */
2899 data_file = fdopen(data_fd, "w+");
2900 lock_data.l_type = F_WRLCK;
2901 lock_data.l_whence = SEEK_SET;
2902 lock_data.l_start = 0;
2903 lock_data.l_len = SPOOL_DATA_START_OFFSET;
2905 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2906 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2907 errno, strerror(errno));
2909 /* We have an open, locked data file. Write the message id to it to make it
2910 self-identifying. Then read the remainder of the input of this message and
2911 write it to the data file. If the variable next != NULL, it contains the first
2912 data line (which was read as a header but then turned out not to have the right
2913 format); write it (remembering that it might contain binary zeros). The result
2914 of fwrite() isn't inspected; instead we call ferror() below. */
2916 fprintf(data_file, "%s-D\n", message_id);
2919 uschar *s = next->text;
2920 int len = next->slen;
2921 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
2922 body_linecount++; /* Assumes only 1 line */
2925 /* Note that we might already be at end of file, or the logical end of file
2926 (indicated by '.'), or might have encountered an error while writing the
2927 message id or "next" line. */
2929 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2933 message_ended = read_message_data_smtp(data_file);
2934 receive_linecount++; /* The terminating "." line */
2936 else message_ended = read_message_data(data_file);
2938 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2939 message_linecount += body_linecount;
2941 /* Handle premature termination of SMTP */
2943 if (smtp_input && message_ended == END_EOF)
2945 Uunlink(spool_name); /* Lose data file when closed */
2946 cancel_cutthrough_connection("sender closed connection");
2947 message_id[0] = 0; /* Indicate no message accepted */
2948 smtp_reply = handle_lost_connection(US"");
2950 goto TIDYUP; /* Skip to end of function */
2953 /* Handle message that is too big. Don't use host_or_ident() in the log
2954 message; we want to see the ident value even for non-remote messages. */
2956 if (message_ended == END_SIZE)
2958 Uunlink(spool_name); /* Lose the data file when closed */
2959 cancel_cutthrough_connection("mail too big");
2960 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2962 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2963 "message too big: read=%d max=%d",
2965 (sender_fullhost == NULL)? "" : " H=",
2966 (sender_fullhost == NULL)? US"" : sender_fullhost,
2967 (sender_ident == NULL)? "" : " U=",
2968 (sender_ident == NULL)? US"" : sender_ident,
2970 thismessage_size_limit);
2974 smtp_reply = US"552 Message size exceeds maximum permitted";
2975 message_id[0] = 0; /* Indicate no message accepted */
2976 goto TIDYUP; /* Skip to end of function */
2980 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2981 give_local_error(ERRMESS_TOOBIG,
2982 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2983 US"message rejected: ", error_rc, data_file, header_list);
2984 /* Does not return */
2989 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2990 example, there may be some expansion in an ACL that uses a timer.) */
2992 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2994 /* The message body has now been read into the data file. Call fflush() to
2995 empty the buffers in C, and then call fsync() to get the data written out onto
2996 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2997 having to do this). If there was an I/O error on either input or output,
2998 attempt to send an error message, and unlink the spool file. For non-SMTP input
2999 we can then give up. Note that for SMTP input we must swallow the remainder of
3000 the input in cases of output errors, since the far end doesn't expect to see
3001 anything until the terminating dot line is sent. */
3003 if (fflush(data_file) == EOF || ferror(data_file) ||
3004 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3006 uschar *msg_errno = US strerror(errno);
3007 BOOL input_error = (receive_ferror)() != 0;
3008 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3009 input_error? "Input read" : "Spool write",
3011 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3013 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3014 Uunlink(spool_name); /* Lose the data file */
3015 cancel_cutthrough_connection("error writing spoolfile");
3020 smtp_reply = US"451 Error while reading input data";
3023 smtp_reply = US"451 Error while writing spool file";
3024 receive_swallow_smtp();
3026 message_id[0] = 0; /* Indicate no message accepted */
3027 goto TIDYUP; /* Skip to end of function */
3032 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3033 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3035 /* Does not return */
3040 /* No I/O errors were encountered while writing the data file. */
3042 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3045 /* If there were any bad addresses extracted by -t, or there were no recipients
3046 left after -t, send a message to the sender of this message, or write it to
3047 stderr if the error handling option is set that way. Note that there may
3048 legitimately be no recipients for an SMTP message if they have all been removed
3051 We need to rewind the data file in order to read it. In the case of no
3052 recipients or stderr error writing, throw the data file away afterwards, and
3053 exit. (This can't be SMTP, which always ensures there's at least one
3054 syntactically good recipient address.) */
3056 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3060 if (recipients_count == 0) debug_printf("*** No recipients\n");
3061 if (bad_addresses != NULL)
3063 error_block *eblock = bad_addresses;
3064 debug_printf("*** Bad address(es)\n");
3065 while (eblock != NULL)
3067 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3068 eblock = eblock->next;
3073 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3075 /* If configured to send errors to the sender, but this fails, force
3076 a failure error code. We use a special one for no recipients so that it
3077 can be detected by the autoreply transport. Otherwise error_rc is set to
3078 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3079 it is EXIT_SUCCESS. */
3081 if (error_handling == ERRORS_SENDER)
3083 if (!moan_to_sender(
3084 (bad_addresses == NULL)?
3085 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3086 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3087 bad_addresses, header_list, data_file, FALSE))
3088 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3092 if (bad_addresses == NULL)
3094 if (extracted_ignored)
3095 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3097 fprintf(stderr, "exim: no recipients in message\n");
3101 fprintf(stderr, "exim: invalid address%s",
3102 (bad_addresses->next == NULL)? ":" : "es:\n");
3103 while (bad_addresses != NULL)
3105 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3106 bad_addresses->text2);
3107 bad_addresses = bad_addresses->next;
3112 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3114 Uunlink(spool_name);
3115 (void)fclose(data_file);
3116 exim_exit(error_rc);
3120 /* Data file successfully written. Generate text for the Received: header by
3121 expanding the configured string, and adding a timestamp. By leaving this
3122 operation till now, we ensure that the timestamp is the time that message
3123 reception was completed. However, this is deliberately done before calling the
3124 data ACL and local_scan().
3126 This Received: header may therefore be inspected by the data ACL and by code in
3127 the local_scan() function. When they have run, we update the timestamp to be
3128 the final time of reception.
3130 If there is just one recipient, set up its value in the $received_for variable
3131 for use when we generate the Received: header.
3133 Note: the checking for too many Received: headers is handled by the delivery
3135 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3137 if (received_header->text == NULL) /* Non-cutthrough case */
3139 received_header_gen();
3141 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3143 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3144 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3146 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3147 now, before running the DATA ACL. */
3149 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3152 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3153 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3155 /* If an ACL is specified for checking things at this stage of reception of a
3156 message, run it, unless all the recipients were removed by "discard" in earlier
3157 ACLs. That is the only case in which recipients_count can be zero at this
3158 stage. Set deliver_datafile to point to the data file so that $message_body and
3159 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3162 deliver_datafile = data_fd;
3165 enable_dollar_recipients = TRUE;
3167 if (recipients_count == 0)
3169 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
3173 /* Handle interactive SMTP messages */
3175 if (smtp_input && !smtp_batched_input)
3178 #ifndef DISABLE_DKIM
3179 if (!dkim_disable_verify)
3181 /* Finish verification, this will log individual signature results to
3183 dkim_exim_verify_finish();
3185 /* Check if we must run the DKIM ACL */
3186 if ((acl_smtp_dkim != NULL) &&
3187 (dkim_verify_signers != NULL) &&
3188 (dkim_verify_signers[0] != '\0'))
3190 uschar *dkim_verify_signers_expanded =
3191 expand_string(dkim_verify_signers);
3192 if (dkim_verify_signers_expanded == NULL)
3194 log_write(0, LOG_MAIN|LOG_PANIC,
3195 "expansion of dkim_verify_signers option failed: %s",
3196 expand_string_message);
3201 const uschar *ptr = dkim_verify_signers_expanded;
3202 uschar *item = NULL;
3203 uschar *seen_items = NULL;
3204 int seen_items_size = 0;
3205 int seen_items_offset = 0;
3206 uschar itembuf[256];
3207 /* Default to OK when no items are present */
3209 while ((item = string_nextinlist(&ptr, &sep,
3213 /* Prevent running ACL for an empty item */
3214 if (!item || (item[0] == '\0')) continue;
3216 /* Only run ACL once for each domain or identity,
3217 no matter how often it appears in the expanded list. */
3220 uschar *seen_item = NULL;
3221 uschar seen_item_buf[256];
3222 const uschar *seen_items_list = seen_items;
3223 BOOL seen_this_item = FALSE;
3225 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3227 sizeof(seen_item_buf))))
3228 if (Ustrcmp(seen_item,item) == 0)
3230 seen_this_item = TRUE;
3237 debug_printf("acl_smtp_dkim: skipping signer %s, "
3238 "already seen\n", item);
3242 seen_items = string_append(seen_items, &seen_items_size,
3243 &seen_items_offset, 1, ":");
3246 seen_items = string_append(seen_items, &seen_items_size,
3247 &seen_items_offset, 1, item);
3248 seen_items[seen_items_offset] = '\0';
3251 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3254 dkim_exim_acl_setup(item);
3255 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3256 &user_msg, &log_msg);
3261 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3262 "skipping remaining items\n", rc, item);
3263 cancel_cutthrough_connection("dkim acl not ok");
3267 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3270 recipients_count = 0;
3271 blackholed_by = US"DKIM ACL";
3272 if (log_msg != NULL)
3273 blackhole_log_msg = string_sprintf(": %s", log_msg);
3277 Uunlink(spool_name);
3278 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3279 smtp_yield = FALSE; /* No more messages after dropped connection */
3280 smtp_reply = US""; /* Indicate reply already sent */
3281 message_id[0] = 0; /* Indicate no message accepted */
3282 goto TIDYUP; /* Skip to end of function */
3287 #endif /* DISABLE_DKIM */
3289 #ifdef WITH_CONTENT_SCAN
3290 if (recipients_count > 0 &&
3291 acl_smtp_mime != NULL &&
3292 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3294 #endif /* WITH_CONTENT_SCAN */
3296 #ifdef EXPERIMENTAL_DMARC
3297 dmarc_up = dmarc_store_data(from_header);
3298 #endif /* EXPERIMENTAL_DMARC */
3300 #ifndef DISABLE_PRDR
3301 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3305 int all_fail = FAIL;
3307 smtp_printf("353 PRDR content analysis beginning\r\n");
3308 /* Loop through recipients, responses must be in same order received */
3309 for (c = 0; recipients_count > c; c++)
3311 uschar * addr= recipients_list[c].address;
3312 uschar * msg= US"PRDR R=<%s> %s";
3315 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3316 addr, c+1, recipients_count);
3317 rc = acl_check(ACL_WHERE_PRDR, addr,
3318 acl_smtp_data_prdr, &user_msg, &log_msg);
3320 /* If any recipient rejected content, indicate it in final message */
3322 /* If all recipients rejected, indicate in final message */
3327 case OK: case DISCARD: code = US"250"; break;
3328 case DEFER: code = US"450"; break;
3329 default: code = US"550"; break;
3331 if (user_msg != NULL)
3332 smtp_user_msg(code, user_msg);
3337 case OK: case DISCARD:
3338 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3340 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3342 msg = string_sprintf(CS msg, addr, "refusal"); break;
3344 smtp_user_msg(code, msg);
3346 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3347 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3348 else log_write(0, LOG_MAIN, "%s", CS msg);
3350 if (rc != OK) { receive_remove_recipient(addr); c--; }
3352 /* Set up final message, used if data acl gives OK */
3353 smtp_reply = string_sprintf("%s id=%s message %s",
3354 all_fail == FAIL ? US"550" : US"250",
3357 ? US"rejected for all recipients"
3360 : US"accepted for some recipients");
3361 if (recipients_count == 0)
3363 message_id[0] = 0; /* Indicate no message accepted */
3368 prdr_requested = FALSE;
3369 #endif /* !DISABLE_PRDR */
3371 /* Check the recipients count again, as the MIME ACL might have changed
3374 if (acl_smtp_data != NULL && recipients_count > 0)
3376 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3377 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3380 recipients_count = 0;
3381 blackholed_by = US"DATA ACL";
3382 if (log_msg != NULL)
3383 blackhole_log_msg = string_sprintf(": %s", log_msg);
3384 cancel_cutthrough_connection("data acl discard");
3388 Uunlink(spool_name);
3389 cancel_cutthrough_connection("data acl not ok");
3390 #ifdef WITH_CONTENT_SCAN
3393 #ifdef EXPERIMENTAL_DCC
3396 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3397 smtp_yield = FALSE; /* No more messages after dropped connection */
3398 smtp_reply = US""; /* Indicate reply already sent */
3399 message_id[0] = 0; /* Indicate no message accepted */
3400 goto TIDYUP; /* Skip to end of function */
3405 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3406 we cannot take different actions for permanent and temporary rejections. */
3411 #ifdef WITH_CONTENT_SCAN
3412 if (acl_not_smtp_mime != NULL &&
3413 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3416 #endif /* WITH_CONTENT_SCAN */
3418 if (acl_not_smtp != NULL)
3420 uschar *user_msg, *log_msg;
3421 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3424 recipients_count = 0;
3425 blackholed_by = US"non-SMTP ACL";
3426 if (log_msg != NULL)
3427 blackhole_log_msg = string_sprintf(": %s", log_msg);
3431 Uunlink(spool_name);
3432 #ifdef WITH_CONTENT_SCAN
3435 #ifdef EXPERIMENTAL_DCC
3438 /* The ACL can specify where rejections are to be logged, possibly
3439 nowhere. The default is main and reject logs. */
3441 if (log_reject_target != 0)
3442 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3443 sender_address, log_msg);
3445 if (user_msg == NULL) user_msg = US"local configuration problem";
3446 if (smtp_batched_input)
3448 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3449 /* Does not return */
3453 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3454 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3455 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3457 /* Does not return */
3460 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3464 /* The applicable ACLs have been run */
3466 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3467 if (queue_only_policy) queued_by = US"ACL";
3470 #ifdef WITH_CONTENT_SCAN
3474 #ifdef EXPERIMENTAL_DCC
3479 /* The final check on the message is to run the scan_local() function. The
3480 version supplied with Exim always accepts, but this is a hook for sysadmins to
3481 supply their own checking code. The local_scan() function is run even when all
3482 the recipients have been discarded. */
3484 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3486 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3487 deleted, and the incident gets logged. */
3489 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3490 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3491 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3492 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3494 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3495 local_scan_timeout);
3496 local_scan_data = NULL;
3498 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3499 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3500 rc = local_scan(data_fd, &local_scan_data);
3502 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3504 enable_dollar_recipients = FALSE;
3506 store_pool = POOL_MAIN; /* In case changed */
3507 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3510 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3511 os_non_restarting_signal(SIGFPE, SIG_DFL);
3512 os_non_restarting_signal(SIGILL, SIG_DFL);
3513 os_non_restarting_signal(SIGBUS, SIG_DFL);
3515 /* The length check is paranoia against some runaway code, and also because
3516 (for a success return) lines in the spool file are read into big_buffer. */
3518 if (local_scan_data != NULL)
3520 int len = Ustrlen(local_scan_data);
3521 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3522 local_scan_data = string_copyn(local_scan_data, len);
3525 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3527 if (!deliver_freeze) /* ACL might have already frozen */
3529 deliver_freeze = TRUE;
3530 deliver_frozen_at = time(NULL);
3531 frozen_by = US"local_scan()";
3533 rc = LOCAL_SCAN_ACCEPT;
3535 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3537 if (!queue_only_policy) /* ACL might have already queued */
3539 queue_only_policy = TRUE;
3540 queued_by = US"local_scan()";
3542 rc = LOCAL_SCAN_ACCEPT;
3545 /* Message accepted: remove newlines in local_scan_data because otherwise
3546 the spool file gets corrupted. Ensure that all recipients are qualified. */
3548 if (rc == LOCAL_SCAN_ACCEPT)
3550 if (local_scan_data != NULL)
3553 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3555 for (i = 0; i < recipients_count; i++)
3557 recipient_item *r = recipients_list + i;
3558 r->address = rewrite_address_qualify(r->address, TRUE);
3559 if (r->errors_to != NULL)
3560 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3562 if (recipients_count == 0 && blackholed_by == NULL)
3563 blackholed_by = US"local_scan";
3566 /* Message rejected: newlines permitted in local_scan_data to generate
3567 multiline SMTP responses. */
3571 uschar *istemp = US"";
3577 errmsg = local_scan_data;
3579 Uunlink(spool_name); /* Cancel this message */
3583 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3584 "rejection given", rc);
3587 case LOCAL_SCAN_REJECT_NOLOGHDR:
3588 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3591 case LOCAL_SCAN_REJECT:
3592 smtp_code = US"550";
3593 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3596 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3597 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3600 case LOCAL_SCAN_TEMPREJECT:
3602 smtp_code = US"451";
3603 if (errmsg == NULL) errmsg = US"Temporary local problem";
3604 istemp = US"temporarily ";
3608 s = string_append(s, &size, &sptr, 2, US"F=",
3609 (sender_address[0] == 0)? US"<>" : sender_address);
3610 s = add_host_info_for_log(s, &size, &sptr);
3613 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3614 s, istemp, string_printing(errmsg));
3618 if (!smtp_batched_input)
3620 smtp_respond(smtp_code, 3, TRUE, errmsg);
3621 message_id[0] = 0; /* Indicate no message accepted */
3622 smtp_reply = US""; /* Indicate reply already sent */
3623 goto TIDYUP; /* Skip to end of function */
3627 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3628 /* Does not return */
3633 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3634 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3635 US"message rejected by local scan code: ", error_rc, data_file,
3637 /* Does not return */
3641 /* Reset signal handlers to ignore signals that previously would have caused
3642 the message to be abandoned. */
3644 signal(SIGTERM, SIG_IGN);
3645 signal(SIGINT, SIG_IGN);
3648 /* Ensure the first time flag is set in the newly-received message. */
3650 deliver_firsttime = TRUE;
3652 #ifdef EXPERIMENTAL_BRIGHTMAIL
3654 /* rewind data file */
3655 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3656 bmi_verdicts = bmi_process_message(header_list, data_fd);
3660 /* Update the timstamp in our Received: header to account for any time taken by
3661 an ACL or by local_scan(). The new time is the time that all reception
3662 processing is complete. */
3664 timestamp = expand_string(US"${tod_full}");
3665 tslen = Ustrlen(timestamp);
3667 memcpy(received_header->text + received_header->slen - tslen - 1,
3670 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3674 deliver_freeze = FALSE;
3675 queue_only_policy = FALSE;
3678 /* Keep the data file open until we have written the header file, in order to
3679 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3680 don't write the header file, and we unlink the data file. If writing the header
3681 file fails, we have failed to accept this message. */
3683 if (host_checking || blackholed_by != NULL)
3686 Uunlink(spool_name);
3687 msg_size = 0; /* Compute size for log line */
3688 for (h = header_list; h != NULL; h = h->next)
3689 if (h->type != '*') msg_size += h->slen;
3692 /* Write the -H file */
3696 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3698 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3699 Uunlink(spool_name); /* Lose the data file */
3703 smtp_reply = US"451 Error in writing spool file";
3704 message_id[0] = 0; /* Indicate no message accepted */
3709 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3710 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3712 /* Does not return */
3718 /* The message has now been successfully received. */
3720 receive_messagecount++;
3722 /* In SMTP sessions we may receive several in one connection. After each one,
3723 we wait for the clock to tick at the level of message-id granularity. This is
3724 so that the combination of time+pid is unique, even on systems where the pid
3725 can be re-used within our time interval. We can't shorten the interval without
3726 re-designing the message-id. See comments above where the message id is
3727 created. This is Something For The Future. */
3729 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3730 exim_wait_tick(&message_id_tv, id_resolution);
3732 /* Add data size to written header size. We do not count the initial file name
3733 that is in the file, but we do add one extra for the notional blank line that
3734 precedes the data. This total differs from message_size in that it include the
3735 added Received: header and any other headers that got created locally. */
3738 fstat(data_fd, &statbuf);
3740 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3742 /* Generate a "message received" log entry. We do this by building up a dynamic
3743 string as required. Since we commonly want to add two items at a time, use a
3744 macro to simplify the coding. We log the arrival of a new message while the
3745 file is still locked, just in case the machine is *really* fast, and delivers
3746 it first! Include any message id that is in the message - since the syntax of a
3747 message id is actually an addr-spec, we can use the parse routine to canonicize
3752 s = store_get(size);
3754 s = string_append(s, &size, &sptr, 2, US"<= ",
3755 (sender_address[0] == 0)? US"<>" : sender_address);
3756 if (message_reference != NULL)
3757 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3759 s = add_host_info_for_log(s, &size, &sptr);
3762 if (LOGGING(tls_cipher) && tls_in.cipher)
3763 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3764 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3765 s = string_append(s, &size, &sptr, 2, US" CV=",
3766 tls_in.certificate_verified? "yes":"no");
3767 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3768 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3769 string_printing(tls_in.peerdn), US"\"");
3770 if (LOGGING(tls_sni) && tls_in.sni)
3771 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3772 string_printing(tls_in.sni), US"\"");
3775 if (sender_host_authenticated)
3777 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3778 if (authenticated_id != NULL)
3780 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3781 if (LOGGING(smtp_mailauth) && authenticated_sender != NULL)
3782 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3786 #ifndef DISABLE_PRDR
3788 s = string_append(s, &size, &sptr, 1, US" PRDR");
3791 #ifdef SUPPORT_PROXY
3792 if (proxy_session && LOGGING(proxy))
3793 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3796 sprintf(CS big_buffer, "%d", msg_size);
3797 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3799 /* log 8BITMIME mode announced in MAIL_FROM
3803 if (LOGGING(8bitmime))
3805 sprintf(CS big_buffer, "%d", body_8bitmime);
3806 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3809 /* If an addr-spec in a message-id contains a quoted string, it can contain
3810 any characters except " \ and CR and so in particular it can contain NL!
3811 Therefore, make sure we use a printing-characters only version for the log.
3812 Also, allow for domain literals in the message id. */
3814 if (msgid_header != NULL)
3817 BOOL save_allow_domain_literals = allow_domain_literals;
3818 allow_domain_literals = TRUE;
3819 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3820 &errmsg, &start, &end, &domain, FALSE);
3821 allow_domain_literals = save_allow_domain_literals;
3823 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3826 /* If subject logging is turned on, create suitable printing-character
3827 text. By expanding $h_subject: we make use of the MIME decoding. */
3829 if (LOGGING(subject) && subject_header != NULL)
3832 uschar *p = big_buffer;
3833 uschar *ss = expand_string(US"$h_subject:");
3835 /* Backslash-quote any double quotes or backslashes so as to make a
3836 a C-like string, and turn any non-printers into escape sequences. */
3839 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3841 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3846 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3849 /* Terminate the string: string_cat() and string_append() leave room, but do
3850 not put the zero in. */
3854 /* Create a message log file if message logs are being used and this message is
3855 not blackholed. Write the reception stuff to it. We used to leave message log
3856 creation until the first delivery, but this has proved confusing for some
3859 if (message_logs && blackholed_by == NULL)
3863 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3865 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3867 if (fd < 0 && errno == ENOENT)
3870 sprintf(CS temp, "msglog/%s", message_subdir);
3871 if (message_subdir[0] == 0) temp[6] = 0;
3872 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3873 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3878 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3879 spool_name, strerror(errno));
3884 FILE *message_log = fdopen(fd, "a");
3885 if (message_log == NULL)
3887 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3888 spool_name, strerror(errno));
3893 uschar *now = tod_stamp(tod_log);
3894 fprintf(message_log, "%s Received from %s\n", now, s+3);
3895 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3897 if (queue_only_policy) fprintf(message_log,
3898 "%s no immediate delivery: queued by %s\n", now, queued_by);
3899 (void)fclose(message_log);
3904 /* Everything has now been done for a successful message except logging its
3905 arrival, and outputting an SMTP response. While writing to the log, set a flag
3906 to cause a call to receive_bomb_out() if the log cannot be opened. */
3908 receive_call_bombout = TRUE;
3910 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
3911 connection has gone away. This can only be done if there is no unconsumed input
3912 waiting in the local input buffer. We can test for this by calling
3913 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
3914 input to be sent following the final dot, so the presence of following input is
3917 If the connection is still present, but there is no unread input for the
3918 socket, the result of a select() call will be zero. If, however, the connection
3919 has gone away, or if there is pending input, the result of select() will be
3920 non-zero. The two cases can be distinguished by trying to read the next input
3921 character. If we succeed, we can unread it so that it remains in the local
3922 buffer for handling later. If not, the connection has been lost.
3924 Of course, since TCP/IP is asynchronous, there is always a chance that the
3925 connection will vanish between the time of this test and the sending of the
3926 response, but the chance of this happening should be small. */
3928 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
3929 !receive_smtp_buffered())
3932 fd_set select_check;
3933 FD_ZERO(&select_check);
3934 FD_SET(fileno(smtp_in), &select_check);
3938 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
3940 int c = (receive_getc)();
3941 if (c != EOF) (receive_ungetc)(c); else
3943 uschar *msg = US"SMTP connection lost after final dot";
3944 smtp_reply = US""; /* No attempt to send a response */
3945 smtp_yield = FALSE; /* Nothing more on this connection */
3947 /* Re-use the log line workspace */
3950 s = string_cat(s, &size, &sptr, msg);
3951 s = add_host_info_for_log(s, &size, &sptr);
3953 log_write(0, LOG_MAIN, "%s", s);
3955 /* Delete the files for this aborted message. */
3957 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
3958 message_subdir, message_id);
3959 Uunlink(spool_name);
3961 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
3962 message_subdir, message_id);
3963 Uunlink(spool_name);
3965 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
3966 message_subdir, message_id);
3967 Uunlink(spool_name);
3974 /* The connection has not gone away; we really are going to take responsibility
3975 for this message. */
3977 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
3980 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
3981 the sender's dot (below).
3982 If rejected: copy response to sender, wipe the spooled files, log approriately.
3983 If temp-reject: accept to sender, keep the spooled files.
3985 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
3987 XXX We do not handle queue-only, freezing, or blackholes.
3989 if(cutthrough.fd >= 0)
3991 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the message */
3992 /* Logging was done in finaldot() */
3995 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
3996 cutthrough_done = ACCEPTED;
3997 break; /* message_id needed for SMTP accept below */
3999 default: /* Unknown response, or error. Treat as temp-reject. */
4000 case '4': /* Temp-reject. Keep spoolfiles and accept. */
4001 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4002 break; /* message_id needed for SMTP accept below */
4004 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4005 smtp_reply= msg; /* Pass on the exact error */
4006 cutthrough_done = PERM_REJ;
4011 #ifndef DISABLE_PRDR
4012 if(!smtp_reply || prdr_requested)
4017 log_write(0, LOG_MAIN |
4018 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4019 (LOGGING(received_sender)? LOG_SENDER : 0),
4022 /* Log any control actions taken by an ACL or local_scan(). */
4024 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4025 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4026 "no immediate delivery: queued by %s", queued_by);
4028 receive_call_bombout = FALSE;
4030 store_reset(s); /* The store for the main log message can be reused */
4032 /* If the message is frozen, and freeze_tell is set, do the telling. */
4034 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4036 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4037 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4038 message_id, frozen_by, sender_address);
4042 /* Either a message has been successfully received and written to the two spool
4043 files, or an error in writing the spool has occurred for an SMTP message, or
4044 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4045 we will have already given up because there's no point in carrying on!) In
4046 either event, we must now close (and thereby unlock) the data file. In the
4047 successful case, this leaves the message on the spool, ready for delivery. In
4048 the error case, the spool file will be deleted. Then tidy up store, interact
4049 with an SMTP call if necessary, and return.
4051 A fflush() was done earlier in the expectation that any write errors on the
4052 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4053 possible for fclose() to fail - but what to do? What has happened to the lock
4058 process_info[process_info_len] = 0; /* Remove message id */
4059 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4061 /* Now reset signal handlers to their defaults */
4063 signal(SIGTERM, SIG_DFL);
4064 signal(SIGINT, SIG_DFL);
4066 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4067 value, which defaults TRUE - meaning there may be more incoming messages from
4068 this connection. For non-SMTP callers (where there is only ever one message),
4069 the default is FALSE. */
4075 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4076 is set to the response that should be sent. When it is NULL, we generate
4077 default responses. After an ACL error or local_scan() error, the response has
4078 already been sent, and smtp_reply is an empty string to indicate this. */
4080 if (!smtp_batched_input)
4082 if (smtp_reply == NULL)
4084 if (fake_response != OK)
4085 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4086 fake_response_text);
4088 /* An OK response is required; use "message" text if present. */
4090 else if (user_msg != NULL)
4092 uschar *code = US"250";
4094 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4095 smtp_respond(code, len, TRUE, user_msg);
4098 /* Default OK response */
4101 smtp_printf("250 OK id=%s\r\n", message_id);
4104 "\n**** SMTP testing: that is not a real message id!\n\n");
4107 /* smtp_reply is set non-empty */
4109 else if (smtp_reply[0] != 0)
4111 if (fake_response != OK && (smtp_reply[0] == '2'))
4112 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4113 fake_response_text);
4115 smtp_printf("%.1024s\r\n", smtp_reply);
4118 switch (cutthrough_done)
4120 case ACCEPTED: log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4121 case PERM_REJ: { /* Delete spool files */
4122 sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
4123 message_subdir, message_id);
4124 Uunlink(spool_name);
4125 sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
4126 message_subdir, message_id);
4127 Uunlink(spool_name);
4128 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
4129 message_subdir, message_id);
4130 Uunlink(spool_name);
4132 case TMP_REJ: message_id[0] = 0; /* Prevent a delivery from starting */
4135 cutthrough.delivery = FALSE;
4138 /* For batched SMTP, generate an error message on failure, and do
4139 nothing on success. The function moan_smtp_batch() does not return -
4140 it exits from the program with a non-zero return code. */
4142 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
4146 /* If blackholing, we can immediately log this message's sad fate. The data
4147 file has already been unlinked, and the header file was never written to disk.
4148 We must now indicate that nothing was received, to prevent a delivery from
4151 if (blackholed_by != NULL)
4153 const uschar *detail = local_scan_data
4154 ? string_printing(local_scan_data)
4155 : string_sprintf("(%s discarded recipients)", blackholed_by);
4156 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4157 log_write(0, LOG_MAIN, "Completed");
4161 /* Reset headers so that logging of rejects for a subsequent message doesn't
4162 include them. It is also important to set header_last = NULL before exiting
4163 from this function, as this prevents certain rewrites that might happen during
4164 subsequent verifying (of another incoming message) from trying to add headers
4165 when they shouldn't. */
4167 header_list = header_last = NULL;
4169 return yield; /* TRUE if more messages (SMTP only) */
4172 /* End of receive.c */