1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2023 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
10 /* Code for receiving a message and setting up spool files. */
15 #ifdef EXPERIMENTAL_DCC
23 /*************************************************
24 * Local static variables *
25 *************************************************/
27 static int data_fd = -1;
28 static uschar *spool_name = US"";
30 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
32 #ifdef HAVE_LOCAL_SCAN
33 jmp_buf local_scan_env; /* error-handling context for local_scan */
34 unsigned had_local_scan_crash;
35 unsigned had_local_scan_timeout;
39 /*************************************************
40 * Non-SMTP character reading functions *
41 *************************************************/
43 /* These are the default functions that are set up in the variables such as
44 receive_getc initially. They just call the standard functions, passing stdin as
45 the file. (When SMTP input is occurring, different functions are used by
46 changing the pointer variables.) */
48 uschar stdin_buf[4096];
49 uschar * stdin_inptr = stdin_buf;
50 uschar * stdin_inend = stdin_buf;
55 size_t rc = fread(stdin_buf, 1, sizeof(stdin_buf), stdin);
60 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
61 log_write(L_lost_incoming_connection,
62 LOG_MAIN, "timed out while reading local message");
63 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
67 if (filter_test == FTEST_NONE)
69 fprintf(stderr, "\nexim: %s received - message abandoned\n",
70 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
71 log_write(0, LOG_MAIN, "%s received while reading local message",
72 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
74 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
78 stdin_inend = stdin_buf + rc;
79 stdin_inptr = stdin_buf;
84 stdin_getc(unsigned lim)
86 if (stdin_inptr >= stdin_inend)
89 return *stdin_inptr++;
96 return stdin_inptr < stdin_inend;
102 if (stdin_inptr <= stdin_buf)
103 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "buffer underflow in stdin_ungetc");
112 return stdin_hasc() ? FALSE : feof(stdin);
118 return ferror(stdin);
124 /*************************************************
125 * Check that a set sender is allowed *
126 *************************************************/
128 /* This function is called when a local caller sets an explicit sender address.
129 It checks whether this is permitted, which it is for trusted callers.
130 Otherwise, it must match the pattern(s) in untrusted_set_sender.
132 Arguments: the proposed sender address
133 Returns: TRUE for a trusted caller
134 TRUE if the address has been set, untrusted_set_sender has been
135 set, and the address matches something in the list
140 receive_check_set_sender(const uschar * newsender)
142 const uschar * qnewsender;
143 if (f.trusted_caller) return TRUE;
144 if (!newsender || !untrusted_set_sender) return FALSE;
145 qnewsender = Ustrchr(newsender, '@')
146 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
147 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
153 /*************************************************
154 * Read space info for a partition *
155 *************************************************/
157 /* This function is called by receive_check_fs() below, and also by string
158 expansion for variables such as $spool_space. The field names for the statvfs
159 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
160 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
161 have inodes, and they return -1 for the number available.
163 Later: It turns out that some file systems that do not have the concept of
164 inodes return 0 rather than -1. Such systems should also return 0 for the total
165 number of inodes, so we require that to be greater than zero before returning
169 isspool TRUE for spool partition, FALSE for log partition
170 inodeptr address of int to receive inode count; -1 if there isn't one
172 Returns: available on-root space, in kilobytes
173 -1 for log partition if there isn't one
175 All values are -1 if the STATFS functions are not available.
179 receive_statvfs(BOOL isspool, int *inodeptr)
182 struct STATVFS statbuf;
188 /* The spool directory must always exist. */
192 path = spool_directory;
196 /* Need to cut down the log file path to the directory, and to ignore any
197 appearance of "syslog" in it. */
201 int sep = ':'; /* Not variable - outside scripts use */
202 const uschar *p = log_file_path;
205 /* An empty log_file_path means "use the default". This is the same as an
206 empty item in a list. */
208 if (*p == 0) p = US":";
209 /* should never be a tainted list */
210 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
211 if (Ustrcmp(path, "syslog") != 0)
214 if (path == NULL) /* No log files */
220 /* An empty string means use the default, which is in the spool directory.
221 But don't just use the spool directory, as it is possible that the log
222 subdirectory has been symbolically linked elsewhere. */
226 sprintf(CS buffer, CS"%s/log", CS spool_directory);
232 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
236 /* We now have the path; do the business */
238 memset(&statbuf, 0, sizeof(statbuf));
240 if (STATVFS(CS path, &statbuf) != 0)
241 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
242 { /* Can happen on first run after installation */
248 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
249 "%s directory %s: %s", name, path, strerror(errno));
250 smtp_closedown(US"spool or log directory problem");
251 exim_exit(EXIT_FAILURE);
254 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
256 /* Disks are getting huge. Take care with computing the size in kilobytes. */
258 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
261 /* Unable to find partition sizes in this environment. */
271 /*************************************************
272 * Check space on spool and log partitions *
273 *************************************************/
275 /* This function is called before accepting a message; if any thresholds are
276 set, it checks them. If a message_size is supplied, it checks that there is
277 enough space for that size plus the threshold - i.e. that the message won't
278 reduce the space to the threshold. Not all OS have statvfs(); for those that
279 don't, this function always returns TRUE. For some OS the old function and
280 struct name statfs is used; that is handled by a macro, defined in exim.h.
283 msg_size the (estimated) size of an incoming message
285 Returns: FALSE if there isn't enough space, or if the information cannot
287 TRUE if no check was done or there is enough space
291 receive_check_fs(int msg_size)
293 int_eximarith_t space;
296 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
298 space = receive_statvfs(TRUE, &inodes);
301 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
302 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
303 space, inodes, check_spool_space, check_spool_inodes, msg_size);
305 if ( space >= 0 && space + msg_size / 1024 < check_spool_space
306 || inodes >= 0 && inodes < check_spool_inodes)
308 log_write(0, LOG_MAIN, "spool directory space check failed: space="
309 PR_EXIM_ARITH " inodes=%d", space, inodes);
314 if (check_log_space > 0 || check_log_inodes > 0)
316 space = receive_statvfs(FALSE, &inodes);
319 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
320 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
321 space, inodes, check_log_space, check_log_inodes);
323 if ( space >= 0 && space < check_log_space
324 || inodes >= 0 && inodes < check_log_inodes)
326 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
327 " inodes=%d", space, inodes);
337 /*************************************************
338 * Bomb out while reading a message *
339 *************************************************/
341 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
342 received, or if there is a timeout. A rarer case might be if the log files are
343 screwed up and Exim can't open them to record a message's arrival. Handling
344 that case is done by setting a flag to cause the log functions to call this
345 function if there is an ultimate disaster. That is why it is globally
349 reason text reason to pass to the not-quit ACL
350 msg default SMTP response to give if in an SMTP session
355 receive_bomb_out(uschar *reason, uschar *msg)
357 static BOOL already_bombing_out;
358 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
359 timeouts, if someone has something slow in their quit ACL. Since the only
360 things we should be doing are to close down cleanly ASAP, on the second
361 pass we also close down stuff that might be opened again, before bypassing
362 the ACL call and exiting. */
364 /* If spool_name is set, it contains the name of the data file that is being
365 written. Unlink it before closing so that it cannot be picked up by a delivery
366 process. Ensure that any header file is also removed. */
368 if (spool_name[0] != '\0')
371 spool_name[Ustrlen(spool_name) - 1] = 'H';
373 spool_name[0] = '\0';
376 /* Now close the file if it is open, either as a fd or a stream. */
380 (void)fclose(spool_data_file);
381 spool_data_file = NULL;
383 else if (data_fd >= 0)
385 (void)close(data_fd);
389 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
390 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
393 if (!already_bombing_out)
395 already_bombing_out = TRUE;
398 if (smtp_batched_input)
399 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
400 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
401 smtp_active_hostname, msg);
405 /* Exit from the program (non-BSMTP cases) */
407 exim_exit(EXIT_FAILURE);
411 /*************************************************
412 * Data read timeout *
413 *************************************************/
415 /* Handler function for timeouts that occur while reading the data that
418 Argument: the signal number
423 data_timeout_handler(int sig)
425 had_data_timeout = sig;
430 #ifdef HAVE_LOCAL_SCAN
431 /*************************************************
432 * local_scan() timeout *
433 *************************************************/
435 /* Handler function for timeouts that occur while running a local_scan()
436 function. Posix recommends against calling longjmp() from a signal-handler,
437 but the GCC manual says you can so we will, and trust that it's better than
438 calling probably non-signal-safe funxtions during logging from within the
439 handler, even with other compilers.
441 See also https://cwe.mitre.org/data/definitions/745.html which also lists
444 This is all because we have no control over what might be written for a
445 local-scan function, so cannot sprinkle had-signal checks after each
446 call-site. At least with the default "do-nothing" function we won't
449 Argument: the signal number
454 local_scan_timeout_handler(int sig)
456 had_local_scan_timeout = sig;
457 siglongjmp(local_scan_env, 1);
462 /*************************************************
463 * local_scan() crashed *
464 *************************************************/
466 /* Handler function for signals that occur while running a local_scan()
469 Argument: the signal number
474 local_scan_crash_handler(int sig)
476 had_local_scan_crash = sig;
477 siglongjmp(local_scan_env, 1);
480 #endif /*HAVE_LOCAL_SCAN*/
483 /*************************************************
484 * SIGTERM or SIGINT received *
485 *************************************************/
487 /* Handler for SIGTERM or SIGINT signals that occur while reading the
488 data that comprises a message.
490 Argument: the signal number
495 data_sigterm_sigint_handler(int sig)
497 had_data_sigint = sig;
502 /*************************************************
503 * Add new recipient to list *
504 *************************************************/
506 /* This function builds a list of recipient addresses in argc/argv
510 recipient the next address to add to recipients_list
511 pno parent number for fixed aliases; -1 otherwise
517 receive_add_recipient(const uschar * recipient, int pno)
519 if (recipients_count >= recipients_list_max)
521 recipient_item *oldlist = recipients_list;
522 int oldmax = recipients_list_max;
524 const int safe_recipients_limit = INT_MAX / 2 / sizeof(recipient_item);
525 if (recipients_list_max < 0 || recipients_list_max >= safe_recipients_limit)
527 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Too many recipients: %d", recipients_list_max);
530 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
531 recipients_list = store_get(recipients_list_max * sizeof(recipient_item), GET_UNTAINTED);
533 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
536 recipients_list[recipients_count].address = recipient;
537 recipients_list[recipients_count].pno = pno;
538 #ifdef EXPERIMENTAL_BRIGHTMAIL
539 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
540 /* reset optin string pointer for next recipient */
541 bmi_current_optin = NULL;
543 recipients_list[recipients_count].orcpt = NULL;
544 recipients_list[recipients_count].dsn_flags = 0;
545 recipients_list[recipients_count++].errors_to = NULL;
551 /*************************************************
552 * Send user response message *
553 *************************************************/
555 /* This function is passed a default response code and a user message. It calls
556 smtp_message_code() to check and possibly modify the response code, and then
557 calls smtp_respond() to transmit the response. I put this into a function
558 just to avoid a lot of repetition.
561 code the response code
562 user_msg the user message
569 smtp_user_msg(uschar *code, uschar *user_msg)
572 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
573 smtp_respond(code, len, SR_FINAL, user_msg);
581 /*************************************************
582 * Remove a recipient from the list *
583 *************************************************/
585 /* This function is provided for local_scan() to use.
588 recipient address to remove
590 Returns: TRUE if it did remove something; FALSE otherwise
594 receive_remove_recipient(const uschar * recipient)
596 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
598 for (int count = 0; count < recipients_count; count++)
599 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
601 if ((--recipients_count - count) > 0)
602 memmove(recipients_list + count, recipients_list + count + 1,
603 (recipients_count - count)*sizeof(recipient_item));
613 /* Pause for a while waiting for input. If none received in that time,
614 close the logfile, if we had one open; then if we wait for a long-running
615 datasource (months, in one use-case) log rotation will not leave us holding
621 if (!receive_timeout && !receive_hasc())
624 timesince(&t, &received_time);
625 if (t.tv_sec > 30*60)
628 if (poll_one_fd(0, POLLIN, (30*60 - t.tv_sec) * 1000) == 0)
633 /*************************************************
634 * Read data portion of a non-SMTP message *
635 *************************************************/
637 /* This function is called to read the remainder of a message (following the
638 header) when the input is not from SMTP - we are receiving a local message on
639 a standard input stream. The message is always terminated by EOF, and is also
640 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
641 two cases for maximum efficiency.
643 Ensure that the body ends with a newline. This will naturally be the case when
644 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
645 as "sequences of lines" - this of course strictly applies only to SMTP, but
646 deliveries into BSD-type mailbox files also require it. Exim used to have a
647 flag for doing this at delivery time, but as it was always set for all
648 transports, I decided to simplify things by putting the check here instead.
650 There is at least one MUA (dtmail) that sends CRLF via this interface, and
651 other programs are known to do this as well. Exim used to have a option for
652 dealing with this: in July 2003, after much discussion, the code has been
653 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
655 However, for the case when a dot on a line by itself terminates a message, the
656 only recognized terminating sequences before and after the dot are LF and CRLF.
657 Otherwise, having read EOL . CR, you don't know whether to read another
660 Internally, in messages stored in Exim's spool files, LF is used as the line
661 terminator. Under the new regime, bare CRs will no longer appear in these
665 fout a FILE to which to write the message
667 Returns: One of the END_xxx values indicating why it stopped reading
671 read_message_data(FILE *fout)
675 register int linelength = 0;
677 /* Handle the case when only EOF terminates the message */
684 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
687 if (ch == 0) body_zerocount++;
688 if (last_ch == '\r' && ch != '\n')
690 if (linelength > max_received_linelength)
691 max_received_linelength = linelength;
693 if (fputc('\n', fout) == EOF) return END_WERROR;
697 if (ch == '\r') continue;
699 if (fputc(ch, fout) == EOF) return END_WERROR;
702 if (linelength > max_received_linelength)
703 max_received_linelength = linelength;
708 if (++message_size > thismessage_size_limit) return END_SIZE;
713 if (linelength > max_received_linelength)
714 max_received_linelength = linelength;
715 if (fputc('\n', fout) == EOF) return END_WERROR;
723 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
727 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
729 if (ch == 0) body_zerocount++;
732 case 0: /* Normal state (previous char written) */
736 if (linelength > max_received_linelength)
737 max_received_linelength = linelength;
742 { ch_state = 2; continue; }
745 case 1: /* After written "\n" */
746 if (ch == '.') { ch_state = 3; continue; }
747 if (ch == '\r') { ch_state = 2; continue; }
748 if (ch == '\n') { body_linecount++; linelength = -1; }
753 body_linecount++; /* After unwritten "\r" */
754 if (linelength > max_received_linelength)
755 max_received_linelength = linelength;
763 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
764 if (ch == '\r') continue;
770 case 3: /* After "\n." (\n written, dot not) */
771 if (ch == '\n') return END_DOT;
772 if (ch == '\r') { ch_state = 4; continue; }
775 if (fputc('.', fout) == EOF) return END_WERROR;
779 case 4: /* After "\n.\r" (\n written, rest not) */
780 if (ch == '\n') return END_DOT;
783 if (fputs(".\n", fout) == EOF) return END_WERROR;
784 if (ch == '\r') { ch_state = 2; continue; }
790 if (fputc(ch, fout) == EOF) return END_WERROR;
791 if (++message_size > thismessage_size_limit) return END_SIZE;
794 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
795 the message ends with a newline, and we must also write any characters that
796 were saved up while testing for an ending dot. */
800 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
801 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
802 message_size += Ustrlen(ends[ch_state]);
812 /*************************************************
813 * Read data portion of an SMTP message *
814 *************************************************/
816 /* This function is called to read the remainder of an SMTP message (after the
817 headers), or to skip over it when an error has occurred. In this case, the
818 output file is passed as NULL.
820 If any line begins with a dot, that character is skipped. The input should only
821 be successfully terminated by CR LF . CR LF unless it is local (non-network)
822 SMTP, in which case the CRs are optional, but...
824 FUDGE: It seems that sites on the net send out messages with just LF
825 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
826 we make the CRs optional in all cases.
828 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
829 well, so that there are no CRs in spooled messages. However, the message
830 terminating dot is not recognized between two bare CRs.
833 fout a FILE to which to write the message; NULL if skipping
835 Returns: One of the END_xxx values indicating why it stopped reading
839 read_message_data_smtp(FILE *fout)
845 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
847 if (ch == 0) body_zerocount++;
850 case 0: /* After LF or CRLF */
854 continue; /* Don't ever write . after LF */
858 /* Else fall through to handle as normal uschar. */
860 case 1: /* Normal state */
865 if (linelength > max_received_linelength)
866 max_received_linelength = linelength;
876 case 2: /* After (unwritten) CR */
878 if (linelength > max_received_linelength)
879 max_received_linelength = linelength;
888 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
889 cutthrough_data_put_nl();
890 if (ch != '\r') ch_state = 1; else continue;
894 case 3: /* After [CR] LF . */
902 /* The dot was removed at state 3. For a doubled dot, here, reinstate
903 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
904 and to file below. */
908 cutthrough_data_puts(&c, 1);
913 case 4: /* After [CR] LF . CR */
914 if (ch == '\n') return END_DOT;
917 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
918 cutthrough_data_put_nl();
928 /* Add the character to the spool file, unless skipping; then loop for the
935 if (fputc(ch, fout) == EOF) return END_WERROR;
936 if (message_size > thismessage_size_limit) return END_SIZE;
939 cutthrough_data_put_nl();
943 cutthrough_data_puts(&c, 1);
947 /* Fall through here if EOF encountered. This indicates some kind of error,
948 since a correct message is terminated by [CR] LF . [CR] LF. */
956 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
957 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
958 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
959 body_linecount accounting for proper re-expansion for the wire, so use
960 a cut-down version of the state-machine above; we don't need to do leading-dot
961 detection and unstuffing.
964 fout a FILE to which to write the message; NULL if skipping;
965 must be open for both writing and reading.
967 Returns: One of the END_xxx values indicating why it stopped reading
971 read_message_bdat_smtp(FILE * fout)
973 int linelength = 0, ch;
974 enum CH_STATE ch_state = LF_SEEN;
979 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
981 case EOF: return END_EOF;
982 case ERR: return END_PROTOCOL;
984 /* Nothing to get from the sender anymore. We check the last
985 character written to the spool.
987 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
988 If we would be strict, we would refuse such broken messages.
989 But we are liberal, so we fix it. It would be easy just to append
990 the "\n" to the spool.
992 But there are some more things (line counting, message size calculation and such),
993 that would need to be duplicated here. So we simply do some ungetc
998 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
999 if (fgetc(fout) == '\n') return END_DOT;
1002 if (linelength == -1) /* \r already seen (see below) */
1004 DEBUG(D_receive) debug_printf("Add missing LF\n");
1008 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
1009 bdat_ungetc('\r'); /* not even \r was seen */
1013 case '\0': body_zerocount++; break;
1017 case LF_SEEN: /* After LF or CRLF */
1018 ch_state = MID_LINE;
1019 /* fall through to handle as normal uschar. */
1021 case MID_LINE: /* Mid-line state */
1026 if (linelength > max_received_linelength)
1027 max_received_linelength = linelength;
1030 else if (ch == '\r')
1033 if (fix_nl) bdat_ungetc('\n');
1034 continue; /* don't write CR */
1038 case CR_SEEN: /* After (unwritten) CR */
1040 if (linelength > max_received_linelength)
1041 max_received_linelength = linelength;
1048 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1049 cutthrough_data_put_nl();
1050 if (ch == '\r') continue; /* don't write CR */
1051 ch_state = MID_LINE;
1056 /* Add the character to the spool file, unless skipping */
1062 if (fputc(ch, fout) == EOF) return END_WERROR;
1063 if (message_size > thismessage_size_limit) return END_SIZE;
1066 cutthrough_data_put_nl();
1070 cutthrough_data_puts(&c, 1);
1077 read_message_bdat_smtp_wire(FILE * fout)
1081 /* Remember that this message uses wireformat. */
1083 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1084 fout ? "writing spoolfile in wire format" : "flushing input");
1085 f.spool_file_wireformat = TRUE;
1089 if (chunking_data_left > 0)
1091 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1092 uschar * buf = bdat_getbuf(&len);
1094 if (!buf) return END_EOF;
1095 message_size += len;
1096 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1098 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1100 case EOF: return END_EOF;
1101 case EOD: return END_DOT;
1102 case ERR: return END_PROTOCOL;
1108 max_received_linelength
1112 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1115 if (message_size > thismessage_size_limit) return END_SIZE;
1123 /*************************************************
1124 * Swallow SMTP message *
1125 *************************************************/
1127 /* This function is called when there has been some kind of error while reading
1128 an SMTP message, and the remaining data may need to be swallowed. It is global
1129 because it is called from smtp_closedown() to shut down an incoming call
1132 Argument: a FILE from which to read the message
1137 receive_swallow_smtp(void)
1139 if (message_ended >= END_NOTENDED)
1140 message_ended = chunking_state <= CHUNKING_OFFERED
1141 ? read_message_data_smtp(NULL)
1142 : read_message_bdat_smtp_wire(NULL);
1147 /*************************************************
1148 * Handle lost SMTP connection *
1149 *************************************************/
1151 /* This function logs connection loss incidents and generates an appropriate
1154 Argument: additional data for the message
1155 Returns: the SMTP response
1159 handle_lost_connection(uschar * s)
1161 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1162 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1163 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1164 return US"421 Lost incoming connection";
1170 /*************************************************
1171 * Handle a non-smtp reception error *
1172 *************************************************/
1174 /* This function is called for various errors during the reception of non-SMTP
1175 messages. It either sends a message to the sender of the problem message, or it
1176 writes to the standard error stream.
1179 errcode code for moan_to_sender(), identifying the error
1180 text1 first message text, passed to moan_to_sender()
1181 text2 second message text, used only for stderrr
1182 error_rc code to pass to exim_exit if no problem
1183 f FILE containing body of message (may be stdin)
1184 hptr pointer to instore headers or NULL
1186 Returns: calls exim_exit(), which does not return
1190 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1191 FILE *f, header_line *hptr)
1193 if (error_handling == ERRORS_SENDER)
1197 eblock.text1 = text1;
1198 eblock.text2 = US"";
1199 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1200 error_rc = EXIT_FAILURE;
1203 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1205 exim_exit(error_rc);
1210 /*************************************************
1211 * Add header lines set up by ACL *
1212 *************************************************/
1214 /* This function is called to add the header lines that were set up by
1215 statements in an ACL to the list of headers in memory. It is done in two stages
1216 like this, because when the ACL for RCPT is running, the other headers have not
1217 yet been received. This function is called twice; once just before running the
1218 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1219 are visible to the DATA ACL.
1221 Originally these header lines were added at the end. Now there is support for
1222 three different places: top, bottom, and after the Received: header(s). There
1223 will always be at least one Received: header, even if it is marked deleted, and
1224 even if something else has been put in front of it.
1227 acl_name text to identify which ACL
1233 add_acl_headers(int where, uschar * acl_name)
1235 header_line * last_received = NULL;
1239 case ACL_WHERE_DKIM:
1240 case ACL_WHERE_MIME:
1241 case ACL_WHERE_DATA:
1242 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1243 && (acl_removed_headers || acl_added_headers))
1245 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1246 " will not take effect on cutthrough deliveries");
1251 if (acl_removed_headers)
1253 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1255 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1257 const uschar * list = acl_removed_headers, * s;
1258 int sep = ':'; /* This is specified as a colon-separated list */
1260 /* If a list element has a leading '^' then it is an RE for
1261 the whole header, else just a header name. */
1262 while ((s = string_nextinlist(&list, &sep, NULL, 0)))
1265 regex_must_compile(s, MCS_CACHEABLE, FALSE),
1266 h->text, h->slen, NULL)
1268 || header_testname(h, s, Ustrlen(s), FALSE)
1271 h->type = htype_old;
1272 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1275 acl_removed_headers = NULL;
1276 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1279 if (!acl_added_headers) return;
1280 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1282 for (header_line * h = acl_added_headers, * next; h; h = next)
1289 h->next = header_list;
1291 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1297 last_received = header_list;
1298 while (!header_testname(last_received, US"Received", 8, FALSE))
1299 last_received = last_received->next;
1300 while (last_received->next &&
1301 header_testname(last_received->next, US"Received", 8, FALSE))
1302 last_received = last_received->next;
1304 h->next = last_received->next;
1305 last_received->next = h;
1306 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1310 /* add header before any header which is NOT Received: or Resent- */
1311 last_received = header_list;
1312 while ( last_received->next &&
1313 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1314 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1315 last_received = last_received->next;
1316 /* last_received now points to the last Received: or Resent-* header
1317 in an uninterrupted chain of those header types (seen from the beginning
1318 of all headers. Our current header must follow it. */
1319 h->next = last_received->next;
1320 last_received->next = h;
1321 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1326 header_last->next = h;
1327 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1331 if (!h->next) header_last = h;
1333 /* Check for one of the known header types (From:, To:, etc.) though in
1334 practice most added headers are going to be "other". Lower case
1335 identification letters are never stored with the header; they are used
1336 for existence tests when messages are received. So discard any lower case
1339 h->type = header_checkname(h, FALSE);
1340 if (h->type >= 'a') h->type = htype_other;
1342 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1345 acl_added_headers = NULL;
1346 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1351 /*************************************************
1352 * Add host information for log line *
1353 *************************************************/
1355 /* Called for acceptance and rejecting log lines. This adds information about
1356 the calling host to a string that is being built dynamically.
1359 s the dynamic string
1361 Returns: the extended string
1365 add_host_info_for_log(gstring * g)
1367 if (sender_fullhost)
1369 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1370 g = string_catn(g, US" DS", 3);
1371 g = string_append(g, 2, US" H=", sender_fullhost);
1372 if (LOGGING(incoming_interface) && interface_address)
1373 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1375 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1377 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1378 f.tcp_in_fastopen_logged = TRUE;
1381 g = string_append(g, 2, US" U=", sender_ident);
1382 if (LOGGING(connection_id))
1383 g = string_fmt_append(g, " Ci=%lu", connection_id);
1384 if (received_protocol)
1385 g = string_append(g, 2, US" P=", received_protocol);
1386 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1388 g = string_catn(g, US" L", 2);
1389 #ifndef DISABLE_PIPE_CONNECT
1390 if (f.smtp_in_early_pipe_used)
1391 g = string_catn(g, US"*", 1);
1392 else if (f.smtp_in_early_pipe_advertised)
1393 g = string_catn(g, US".", 1);
1395 if (!f.smtp_in_pipelining_used)
1396 g = string_catn(g, US"-", 1);
1403 #ifdef WITH_CONTENT_SCAN
1405 /*************************************************
1406 * Run the MIME ACL on a message *
1407 *************************************************/
1409 /* This code is in a subroutine so that it can be used for both SMTP
1410 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1413 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1414 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1415 smtp_reply_ptr Where SMTP reply is being built
1416 blackholed_by_ptr Where "blackholed by" message is being built
1418 Returns: TRUE to carry on; FALSE to abandon the message
1422 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1423 uschar **blackholed_by_ptr)
1426 uschar * rfc822_file_path = NULL;
1427 unsigned long mbox_size;
1428 uschar *user_msg, *log_msg;
1429 int mime_part_count_buffer = -1;
1430 uschar * mbox_filename;
1433 /* check if it is a MIME message */
1435 for (header_line * my_headerlist = header_list; my_headerlist;
1436 my_headerlist = my_headerlist->next)
1437 if ( my_headerlist->type != '*' /* skip deleted headers */
1438 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1441 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1445 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1450 /* make sure the eml mbox file is spooled up */
1451 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1452 { /* error while spooling */
1453 log_write(0, LOG_MAIN|LOG_PANIC,
1454 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1455 Uunlink(spool_name);
1457 #ifdef EXPERIMENTAL_DCC
1460 smtp_respond(US"451", 3, SR_FINAL, US"temporary local problem");
1461 message_id[0] = 0; /* Indicate no message accepted */
1462 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1463 return FALSE; /* Indicate skip to end of receive function */
1469 mime_part_count = -1;
1470 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1471 (void)fclose(mbox_file);
1473 if (rfc822_file_path)
1475 mime_part_count = mime_part_count_buffer;
1477 if (unlink(CS rfc822_file_path) == -1)
1479 log_write(0, LOG_PANIC,
1480 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1483 rfc822_file_path = NULL;
1486 /* check if we must check any message/rfc822 attachments */
1489 uschar * scandir = string_copyn(mbox_filename,
1490 Ustrrchr(mbox_filename, '/') - mbox_filename);
1491 struct dirent * entry;
1494 for (tempdir = exim_opendir(scandir); entry = readdir(tempdir); )
1495 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1497 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1499 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1505 if (rfc822_file_path)
1507 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1509 /* set RFC822 expansion variable */
1511 mime_part_count_buffer = mime_part_count;
1512 goto MIME_ACL_CHECK;
1514 log_write(0, LOG_PANIC,
1515 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1516 unlink(CS rfc822_file_path);
1521 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1524 recipients_count = 0;
1525 *blackholed_by_ptr = US"MIME ACL";
1526 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1530 Uunlink(spool_name);
1531 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1533 #ifdef EXPERIMENTAL_DCC
1538 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1539 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1540 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1542 message_id[0] = 0; /* Indicate no message accepted */
1543 return FALSE; /* Cause skip to end of receive function */
1549 #endif /* WITH_CONTENT_SCAN */
1554 received_header_gen(void)
1557 uschar * timestamp = expand_string(US"${tod_full}");
1558 header_line * received_header= header_list;
1560 if (recipients_count == 1) received_for = recipients_list[0].address;
1561 received = expand_string(received_header_text);
1562 received_for = NULL;
1566 if(spool_name[0] != 0)
1567 Uunlink(spool_name); /* Lose the data file */
1568 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1569 "(received_header_text) failed: %s", string_printing(received_header_text),
1570 expand_string_message);
1573 /* The first element on the header chain is reserved for the Received header,
1574 so all we have to do is fill in the text pointer, and set the type. However, if
1575 the result of the expansion is an empty string, we leave the header marked as
1576 "old" so as to refrain from adding a Received header. */
1580 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1581 received_header->type = htype_old;
1585 received_header->text = string_sprintf("%s;\n\t%s\n", received, timestamp);
1586 received_header->type = htype_received;
1589 received_header->slen = Ustrlen(received_header->text);
1591 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1592 received_header->type, received_header->text);
1597 /*************************************************
1599 *************************************************/
1601 /* Receive a message on the given input, and put it into a pair of spool files.
1602 Either a non-null list of recipients, or the extract flag will be true, or
1603 both. The flag sender_local is true for locally generated messages. The flag
1604 submission_mode is true if an ACL has obeyed "control = submission". The flag
1605 suppress_local_fixups is true if an ACL has obeyed "control =
1606 suppress_local_fixups" or -G was passed on the command-line.
1607 The flag smtp_input is true if the message is to be
1608 handled using SMTP conventions about termination and lines starting with dots.
1609 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1611 If a message was successfully read, message_id[0] will be non-zero.
1613 The general actions of this function are:
1615 . Read the headers of the message (if any) into a chain of store
1618 . If there is a "sender:" header and the message is locally originated,
1619 throw it away, unless the caller is trusted, or unless
1620 active_local_sender_retain is set - which can only happen if
1621 active_local_from_check is false.
1623 . If recipients are to be extracted from the message, build the
1624 recipients list from the headers, removing any that were on the
1625 original recipients list (unless extract_addresses_remove_arguments is
1626 false), and at the same time, remove any bcc header that may be present.
1628 . Get the spool file for the data, sort out its unique name, open
1629 and lock it (but don't give it the name yet).
1631 . Generate a "Message-Id" header if the message doesn't have one, for
1632 locally-originated messages.
1634 . Generate a "Received" header.
1636 . Ensure the recipients list is fully qualified and rewritten if necessary.
1638 . If there are any rewriting rules, apply them to the sender address
1639 and also to the headers.
1641 . If there is no from: header, generate one, for locally-generated messages
1642 and messages in "submission mode" only.
1644 . If the sender is local, check that from: is correct, and if not, generate
1645 a Sender: header, unless message comes from a trusted caller, or this
1646 feature is disabled by active_local_from_check being false.
1648 . If there is no "date" header, generate one, for locally-originated
1649 or submission mode messages only.
1651 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1652 dot_ends mode, to the data file. Leave it open, to hold the lock.
1654 . Write the envelope and the headers to a new file.
1656 . Set the name for the header file; close it.
1658 . Set the name for the data file; close it.
1660 Because this function can potentially be called many times in a single
1661 SMTP connection, all store should be got by store_get(), so that it will be
1662 automatically retrieved after the message is accepted.
1664 FUDGE: It seems that sites on the net send out messages with just LF
1665 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1666 we make the CRs optional in all cases.
1668 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1669 new regime is now in place in which bare CRs in header lines are turned into LF
1670 followed by a space, so as not to terminate the header line.
1672 February 2004: A bare LF in a header line in a message whose first line was
1673 terminated by CRLF is treated in the same way as a bare CR.
1676 extract_recip TRUE if recipients are to be extracted from the message's
1679 Returns: TRUE there are more messages to be read (SMTP input)
1680 FALSE there are no more messages to be read (non-SMTP input
1681 or SMTP connection collapsed, or other failure)
1683 When reading a message for filter testing, the returned value indicates
1684 whether the headers (which is all that is read) were terminated by '.' or
1688 receive_msg(BOOL extract_recip)
1692 int process_info_len = Ustrlen(process_info);
1693 int error_rc = error_handling == ERRORS_SENDER
1694 ? errors_sender_rc : EXIT_FAILURE;
1695 int header_size = 256;
1697 int prevlines_length = 0;
1698 const int id_resolution = BASE_62 == 62 && !host_number_string ? 1
1699 : BASE_62 != 62 && host_number_string ? 4
1704 BOOL contains_resent_headers = FALSE;
1705 BOOL extracted_ignored = FALSE;
1706 BOOL first_line_ended_crlf = TRUE_UNSET;
1707 BOOL smtp_yield = TRUE;
1710 BOOL resents_exist = FALSE;
1711 uschar *resent_prefix = US"";
1712 uschar *blackholed_by = NULL;
1713 uschar *blackhole_log_msg = US"";
1714 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1717 error_block *bad_addresses = NULL;
1719 uschar *frozen_by = NULL;
1720 uschar *queued_by = NULL;
1723 rmark rcvd_log_reset_point;
1725 struct stat statbuf;
1727 /* Final message to give to SMTP caller, and messages from ACLs */
1729 uschar *smtp_reply = NULL;
1730 uschar *user_msg, *log_msg;
1732 /* Working header pointers */
1737 /* Flags for noting the existence of certain headers (only one left) */
1739 BOOL date_header_exists = FALSE;
1741 /* Pointers to receive the addresses of headers whose contents we need. */
1743 header_line *from_header = NULL;
1744 header_line *subject_header = NULL;
1745 header_line *msgid_header = NULL;
1746 header_line *received_header;
1747 BOOL msgid_header_newly_created = FALSE;
1749 /* Variables for use when building the Received: header. */
1754 /* Time of creation of message_id */
1756 static struct timeval message_id_tv = { 0, 0 };
1759 /* Release any open files that might have been cached while preparing to
1760 accept the message - e.g. by verifying addresses - because reading a message
1761 might take a fair bit of real time. */
1765 /* Extracting the recipient list from an input file is incompatible with
1766 cutthrough delivery with the no-spool option. It shouldn't be possible
1767 to set up the combination, but just in case kill any ongoing connection. */
1768 if (extract_recip || !smtp_input)
1769 cancel_cutthrough_connection(TRUE, US"not smtp input");
1771 /* Initialize the chain of headers by setting up a place-holder for Received:
1772 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1773 pointing to the end of the chain to make adding headers simple. */
1775 received_header = header_list = header_last = store_get(sizeof(header_line), GET_UNTAINTED);
1776 header_list->next = NULL;
1777 header_list->type = htype_old;
1778 header_list->text = NULL;
1779 header_list->slen = 0;
1781 /* Control block for the next header to be read.
1782 The data comes from the message, so is tainted. */
1784 reset_point = store_mark();
1785 next = store_get(sizeof(header_line), GET_UNTAINTED);
1786 next->text = store_get(header_size, GET_TAINTED);
1788 /* Initialize message id to be null (indicating no message read), and the
1789 header names list to be the normal list. Indicate there is no data file open
1790 yet, initialize the size and warning count, and deal with no size limit. */
1793 spool_data_file = NULL;
1798 received_count = 1; /* For the one we will add */
1800 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1802 /* While reading the message, the following counts are computed. */
1804 message_linecount = body_linecount = body_zerocount =
1805 max_received_linelength = 0;
1807 #ifdef WITH_CONTENT_SCAN
1808 /* reset non-per-part mime variables */
1809 mime_is_coverletter = 0;
1811 mime_part_count = -1;
1814 #ifndef DISABLE_DKIM
1815 /* Call into DKIM to set up the context. In CHUNKING mode
1816 we clear the dot-stuffing flag */
1817 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1818 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1821 #ifdef SUPPORT_DMARC
1822 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1825 /* In SMTP sessions we may receive several messages in one connection. Before
1826 each subsequent one, we wait for the clock to tick at the level of message-id
1828 This is so that the combination of time+pid is unique, even on systems where the
1829 pid can be re-used within our time interval. We can't shorten the interval
1830 without re-designing the message-id. See comments above where the message id is
1831 created. This is Something For The Future.
1832 Do this wait any time we have previously created a message-id, even if we
1833 rejected the message. This gives unique IDs for logging done by ACLs.
1834 The initial timestamp must have been obtained via exim_gettime() to avoid
1835 issues on Linux with suspend/resume. */
1837 if (message_id_tv.tv_sec)
1839 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1840 exim_wait_tick(&message_id_tv, id_resolution);
1843 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1844 ids, and fractions of a second are required. See the comments that precede the
1845 message id creation below.
1846 We use a routine that if possible uses a monotonic clock, and can be used again
1847 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1850 exim_gettime(&message_id_tv);
1852 /* For other uses of the received time we can operate with granularity of one
1853 second, and for that we use the global variable received_time. This is for
1854 things like ultimate message timeouts.
1855 For this we do not care about the Linux suspend/resume problem, so rather than
1856 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1858 gettimeofday(&received_time, NULL);
1860 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1861 happen in the smtp_getc() function when it refills its buffer. */
1863 had_data_timeout = 0;
1865 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1867 /* If not SMTP input, timeout happens only if configured, and we just set a
1868 single timeout for the whole message. */
1870 else if (receive_timeout > 0)
1872 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1873 ALARM(receive_timeout);
1876 /* SIGTERM and SIGINT are caught always. */
1878 had_data_sigint = 0;
1879 signal(SIGTERM, data_sigterm_sigint_handler);
1880 signal(SIGINT, data_sigterm_sigint_handler);
1882 /* Header lines in messages are not supposed to be very long, though when
1883 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1884 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1885 storing the header, and extend this as necessary using string_cat().
1887 To cope with total lunacies, impose an upper limit on the length of the header
1888 section of the message, as otherwise the store will fill up. We must also cope
1889 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1890 Folded header lines are joined into one string, leaving the '\n' characters
1891 inside them, so that writing them out reproduces the input.
1893 Loop for each character of each header; the next structure for chaining the
1894 header is set up already, with ptr the offset of the next character in
1899 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1901 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1902 SMTP must have a correct "." terminator. */
1904 if (smtp_input /* && !smtp_batched_input */)
1907 smtp_reply = handle_lost_connection(US" (header)");
1909 goto TIDYUP; /* Skip to end of function */
1914 /* See if we are at the current header's size limit - there must be at least
1915 four bytes left. This allows for the new character plus a zero, plus two for
1916 extra insertions when we are playing games with dots and carriage returns. If
1917 we are at the limit, extend the text buffer. This could have been done
1918 automatically using string_cat() but because this is a tightish loop storing
1919 only one character at a time, we choose to do it inline. Normally
1920 store_extend() will be able to extend the block; only at the end of a big
1921 store block will a copy be needed. To handle the case of very long headers
1922 (and sometimes lunatic messages can have ones that are 100s of K long) we
1923 call store_release() for strings that have been copied - if the string is at
1924 the start of a block (and therefore the only thing in it, because we aren't
1925 doing any other gets), the block gets freed. We can only do this release if
1926 there were no allocations since the once that we want to free. */
1928 if (ptr >= header_size - 4)
1930 int oldsize = header_size;
1932 if (header_size >= INT_MAX/2)
1936 if (!store_extend(next->text, oldsize, header_size))
1937 next->text = store_newblock(next->text, header_size, ptr);
1940 /* Cope with receiving a binary zero. There is dispute about whether
1941 these should be allowed in RFC 822 messages. The middle view is that they
1942 should not be allowed in headers, at least. Exim takes this attitude at
1943 the moment. We can't just stomp on them here, because we don't know that
1944 this line is a header yet. Set a flag to cause scanning later. */
1946 if (ch == 0) had_zero++;
1948 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1949 those from data files use just LF. Treat LF in local SMTP input as a
1950 terminator too. Treat EOF as a line terminator always. */
1952 if (ch < 0) goto EOL;
1954 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1955 other MTAs accept this. We are therefore forced into this "liberalisation"
1956 too, so we accept LF as a line terminator whatever the source of the message.
1957 However, if the first line of the message ended with a CRLF, we treat a bare
1958 LF specially by inserting a white space after it to ensure that the header
1959 line is not terminated. */
1963 if (first_line_ended_crlf == TRUE_UNSET)
1964 first_line_ended_crlf = FALSE;
1965 else if (first_line_ended_crlf)
1966 receive_ungetc(' ');
1970 /* This is not the end of the line. If this is SMTP input and this is
1971 the first character in the line and it is a "." character, ignore it.
1972 This implements the dot-doubling rule, though header lines starting with
1973 dots aren't exactly common. They are legal in RFC 822, though. If the
1974 following is CRLF or LF, this is the line that that terminates the
1976 entire message. We set message_ended to indicate this has happened (to
1977 prevent further reading), and break out of the loop, having freed the
1978 empty header, and set next = NULL to indicate no data line. */
1980 if (f.dot_ends && ptr == 0 && ch == '.')
1982 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1983 if (ch == '\n' && first_line_ended_crlf == TRUE /* and not TRUE_UNSET */ )
1984 /* dot, LF but we are in CRLF mode. Attack? */
1985 ch = ' '; /* replace the LF with a space */
1987 else if (ch == '\r')
1989 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1992 if (ch >= 0) receive_ungetc(ch);
1993 ch = '\r'; /* Revert to CR */
1998 message_ended = END_DOT;
1999 reset_point = store_reset(reset_point);
2001 break; /* End character-reading loop */
2004 /* For non-SMTP input, the dot at the start of the line was really a data
2005 character. What is now in ch is the following character. We guaranteed
2006 enough space for this above. */
2010 next->text[ptr++] = '.';
2015 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
2016 remember this case if this is the first line ending. */
2020 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2023 if (first_line_ended_crlf == TRUE_UNSET)
2024 first_line_ended_crlf = TRUE;
2028 /* Otherwise, put back the character after CR, and turn the bare CR
2031 if (ch >= 0) (receive_ungetc)(ch);
2032 next->text[ptr++] = '\n';
2037 /* We have a data character for the header line. */
2039 next->text[ptr++] = ch; /* Add to buffer */
2040 message_size++; /* Total message size so far */
2042 /* Handle failure due to a humungously long header section. The >= allows
2043 for the terminating \n. Add what we have so far onto the headers list so
2044 that it gets reflected in any error message, and back up the just-read
2047 if (message_size >= header_maxsize)
2050 next->text[ptr] = 0;
2052 next->type = htype_other;
2054 header_last->next = next;
2057 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2058 "%s (more than %d characters): message abandoned",
2059 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2063 smtp_reply = US"552 Message header is ridiculously long";
2064 receive_swallow_smtp();
2065 goto TIDYUP; /* Skip to end of function */
2070 give_local_error(ERRMESS_VLONGHEADER,
2071 string_sprintf("message header longer than %d characters received: "
2072 "message not accepted", header_maxsize), US"", error_rc, stdin,
2074 /* Does not return */
2078 continue; /* With next input character */
2080 /* End of header line reached */
2084 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2086 receive_linecount++;
2087 message_linecount++;
2089 /* Keep track of maximum line length */
2091 if (ptr - prevlines_length > max_received_linelength)
2092 max_received_linelength = ptr - prevlines_length;
2093 prevlines_length = ptr + 1;
2095 /* Now put in the terminating newline. There is always space for
2096 at least two more characters. */
2098 next->text[ptr++] = '\n';
2101 /* A blank line signals the end of the headers; release the unwanted
2102 space and set next to NULL to indicate this. */
2106 reset_point = store_reset(reset_point);
2111 /* There is data in the line; see if the next input character is a
2112 whitespace character. If it is, we have a continuation of this header line.
2113 There is always space for at least one character at this point. */
2117 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2118 if (nextch == ' ' || nextch == '\t')
2120 next->text[ptr++] = nextch;
2121 if (++message_size >= header_maxsize)
2123 continue; /* Iterate the loop */
2125 else if (nextch >= 0) /* not EOF, ERR etc */
2126 (receive_ungetc)(nextch); /* For next time */
2127 else ch = nextch; /* Cause main loop to exit at end */
2130 /* We have got to the real line end. Terminate the string and release store
2131 beyond it. If it turns out to be a real header, internal binary zeros will
2132 be squashed later. */
2134 next->text[ptr] = 0;
2136 store_release_above(next->text + ptr + 1);
2138 /* Check the running total size against the overall message size limit. We
2139 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2140 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2141 headers - the code to read the body will then also hit the buffer. */
2143 if (message_size > thismessage_size_limit) break;
2145 /* A line that is not syntactically correct for a header also marks
2146 the end of the headers. In this case, we leave next containing the
2147 first data line. This might actually be several lines because of the
2148 continuation logic applied above, but that doesn't matter.
2150 It turns out that smail, and presumably sendmail, accept leading lines
2153 From ph10 Fri Jan 5 12:35 GMT 1996
2155 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2156 find any documentation of this, but for compatibility it had better be
2157 accepted. Exim restricts it to the case of non-smtp messages, and
2158 treats it as an alternative to the -f command line option. Thus it is
2159 ignored except for trusted users or filter testing. Otherwise it is taken
2160 as the sender address, unless -f was used (sendmail compatibility).
2162 It further turns out that some UUCPs generate the From_line in a different
2165 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2167 The regex for matching these things is now capable of recognizing both
2168 formats (including 2- and 4-digit years in the latter). In fact, the regex
2169 is now configurable, as is the expansion string to fish out the sender.
2171 Even further on it has been discovered that some broken clients send
2172 these lines in SMTP messages. There is now an option to ignore them from
2173 specified hosts or networks. Sigh. */
2175 if ( header_last == header_list
2177 || ( sender_host_address
2178 && verify_check_host(&ignore_fromline_hosts) == OK
2180 || (!sender_host_address && ignore_fromline_local)
2182 && regex_match_and_setup(regex_From, next->text, 0, -1)
2185 if (!f.sender_address_forced)
2187 uschar *uucp_sender = expand_string(uucp_from_sender);
2189 log_write(0, LOG_MAIN|LOG_PANIC,
2190 "expansion of \"%s\" failed after matching "
2191 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2194 int start, end, domain;
2196 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2197 &start, &end, &domain, TRUE);
2200 if (domain == 0 && newsender[0] != 0)
2201 /* deconst ok as newsender was not const */
2202 newsender = US rewrite_address_qualify(newsender, FALSE);
2204 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2206 sender_address = newsender;
2208 if (f.trusted_caller || filter_test != FTEST_NONE)
2210 authenticated_sender = NULL;
2211 originator_name = US"";
2212 f.sender_local = FALSE;
2215 if (filter_test != FTEST_NONE)
2216 printf("Sender taken from \"From \" line\n");
2223 /* Not a leading "From " line. Check to see if it is a valid header line.
2224 Header names may contain any non-control characters except space and colon,
2229 uschar * p = next->text;
2231 /* If not a valid header line, break from the header reading loop, leaving
2232 next != NULL, indicating that it holds the first line of the body. */
2234 if (isspace(*p)) break;
2235 while (mac_isgraph(*p) && *p != ':') p++;
2236 while (isspace(*p)) p++;
2239 body_zerocount = had_zero;
2243 /* We have a valid header line. If there were any binary zeroes in
2244 the line, stomp on them here. */
2247 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2250 /* It is perfectly legal to have an empty continuation line
2251 at the end of a header, but it is confusing to humans
2252 looking at such messages, since it looks like a blank line.
2253 Reduce confusion by removing redundant white space at the
2254 end. We know that there is at least one printing character
2255 (the ':' tested for above) so there is no danger of running
2258 p = next->text + ptr - 2;
2261 while (*p == ' ' || *p == '\t') p--;
2262 if (*p != '\n') break;
2263 ptr = (p--) - next->text + 1;
2264 message_size -= next->slen - ptr;
2265 next->text[ptr] = 0;
2269 /* Add the header to the chain */
2271 next->type = htype_other;
2273 header_last->next = next;
2276 /* Check the limit for individual line lengths. This comes after adding to
2277 the chain so that the failing line is reflected if a bounce is generated
2278 (for a local message). */
2280 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2282 log_write(0, LOG_MAIN, "overlong message header line received from "
2283 "%s (more than %d characters): message abandoned",
2284 f.sender_host_unknown ? sender_ident : sender_fullhost,
2285 header_line_maxsize);
2289 smtp_reply = US"552 A message header line is too long";
2290 receive_swallow_smtp();
2291 goto TIDYUP; /* Skip to end of function */
2295 give_local_error(ERRMESS_VLONGHDRLINE,
2296 string_sprintf("message header line longer than %d characters "
2297 "received: message not accepted", header_line_maxsize), US"",
2298 error_rc, stdin, header_list->next);
2299 /* Does not return */
2302 /* Note if any resent- fields exist. */
2304 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2306 resents_exist = TRUE;
2307 resent_prefix = US"Resent-";
2311 /* Reject CHUNKING messages that do not CRLF their first header line */
2313 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2315 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2316 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2318 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2319 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2320 smtp_printf("552 Message header not CRLF terminated\r\n", SP_NO_MORE);
2323 goto TIDYUP; /* Skip to end of function */
2326 /* The line has been handled. If we have hit EOF, break out of the loop,
2327 indicating no pending data line and no more data for the message */
2332 if (ch == EOF) message_ended = END_DOT;
2333 else if (ch == ERR) message_ended = END_PROTOCOL;
2337 /* Set up for the next header */
2339 reset_point = store_mark();
2341 next = store_get(sizeof(header_line), GET_UNTAINTED);
2342 next->text = store_get(header_size, GET_TAINTED);
2345 prevlines_length = 0;
2346 } /* Continue, starting to read the next header */
2348 /* At this point, we have read all the headers into a data structure in main
2349 store. The first header is still the dummy placeholder for the Received: header
2350 we are going to generate a bit later on. If next != NULL, it contains the first
2351 data line - which terminated the headers before reaching a blank line (not the
2356 debug_printf(">>Headers received:\n");
2357 for (header_line * h = header_list->next; h; h = h->next)
2358 debug_printf("%s", h->text);
2362 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2363 is dropped immediately after valid headers, the next thing we will see is EOF.
2364 We must test for this specially, as further down the reading of the data is
2365 skipped if already at EOF.
2366 In CHUNKING mode, a protocol error makes us give up on the message. */
2369 if ((receive_feof)())
2371 smtp_reply = handle_lost_connection(US" (after header)");
2373 goto TIDYUP; /* Skip to end of function */
2375 else if (message_ended == END_PROTOCOL)
2377 smtp_reply = US""; /* no reply needed */
2381 /* If this is a filter test run and no headers were read, output a warning
2382 in case there is a mistake in the test message. */
2384 if (filter_test != FTEST_NONE && header_list->next == NULL)
2385 printf("Warning: no message headers read\n");
2388 /* Scan the headers to identify them. Some are merely marked for later
2389 processing; some are dealt with here. */
2391 for (header_line * h = header_list->next; h; h = h->next)
2393 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2394 if (is_resent) contains_resent_headers = TRUE;
2396 switch (header_checkname(h, is_resent))
2399 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2403 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2406 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2409 if (!resents_exist || is_resent) date_header_exists = TRUE;
2412 /* Same comments as about Return-Path: below. */
2414 case htype_delivery_date:
2415 if (delivery_date_remove) h->type = htype_old;
2418 /* Same comments as about Return-Path: below. */
2420 case htype_envelope_to:
2421 if (envelope_to_remove) h->type = htype_old;
2424 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2425 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2426 header consists of just the login id of the user who called Exim, rewrite
2427 it with the gecos field first. Apply this rule to Resent-From: if there
2428 are resent- fields. */
2431 h->type = htype_from;
2432 if (!resents_exist || is_resent)
2438 uschar *s = Ustrchr(h->text, ':') + 1;
2439 while (isspace(*s)) s++;
2440 len = h->slen - (s - h->text) - 1;
2441 if (Ustrlen(originator_login) == len &&
2442 strncmpic(s, originator_login, len) == 0)
2444 uschar *name = is_resent? US"Resent-From" : US"From";
2445 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2446 originator_login, qualify_domain_sender);
2447 from_header = header_last;
2448 h->type = htype_old;
2449 DEBUG(D_receive|D_rewrite)
2450 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2456 /* Identify the Message-id: header for generating "in-reply-to" in the
2457 autoreply transport. For incoming logging, save any resent- value. In both
2458 cases, take just the first of any multiples. */
2461 if (!msgid_header && (!resents_exist || is_resent))
2468 /* Flag all Received: headers */
2470 case htype_received:
2471 h->type = htype_received;
2475 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2477 case htype_reply_to:
2478 h->type = htype_reply_to;
2481 /* The Return-path: header is supposed to be added to messages when
2482 they leave the SMTP system. We shouldn't receive messages that already
2483 contain Return-path. However, since Exim generates Return-path: on
2484 local delivery, resent messages may well contain it. We therefore
2485 provide an option (which defaults on) to remove any Return-path: headers
2486 on input. Removal actually means flagging as "old", which prevents the
2487 header being transmitted with the message. */
2489 case htype_return_path:
2490 if (return_path_remove) h->type = htype_old;
2492 /* If we are testing a mail filter file, use the value of the
2493 Return-Path: header to set up the return_path variable, which is not
2494 otherwise set. However, remove any <> that surround the address
2495 because the variable doesn't have these. */
2497 if (filter_test != FTEST_NONE)
2499 uschar *start = h->text + 12;
2500 uschar *end = start + Ustrlen(start);
2501 while (isspace(*start)) start++;
2502 while (end > start && isspace(end[-1])) end--;
2503 if (*start == '<' && end[-1] == '>')
2508 return_path = string_copyn(start, end - start);
2509 printf("Return-path taken from \"Return-path:\" header line\n");
2513 /* If there is a "Sender:" header and the message is locally originated,
2514 and from an untrusted caller and suppress_local_fixups is not set, or if we
2515 are in submission mode for a remote message, mark it "old" so that it will
2516 not be transmitted with the message, unless active_local_sender_retain is
2517 set. (This can only be true if active_local_from_check is false.) If there
2518 are any resent- headers in the message, apply this rule to Resent-Sender:
2519 instead of Sender:. Messages with multiple resent- header sets cannot be
2520 tidily handled. (For this reason, at least one MUA - Pine - turns old
2521 resent- headers into X-resent- headers when resending, leaving just one
2525 h->type = !f.active_local_sender_retain
2526 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2527 || f.submission_mode
2529 && (!resents_exist || is_resent)
2530 ? htype_old : htype_sender;
2533 /* Remember the Subject: header for logging. There is no Resent-Subject */
2539 /* "To:" gets flagged, and the existence of a recipient header is noted,
2540 whether it's resent- or not. */
2545 to_or_cc_header_exists = TRUE;
2551 /* Extract recipients from the headers if that is required (the -t option).
2552 Note that this is documented as being done *before* any address rewriting takes
2553 place. There are two possibilities:
2555 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2556 recipients already listed are to be REMOVED from the message. Smail 3 works
2557 like this. We need to build a non-recipients tree for that list, because in
2558 subsequent processing this data is held in a tree and that's what the
2559 spool_write_header() function expects. Make sure that non-recipient addresses
2560 are fully qualified and rewritten if necessary.
2562 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2563 those in the command line arguments (and it is rumoured some other MTAs do
2564 this). Therefore, there is an option to make Exim behave this way.
2566 *** Notes on "Resent-" header lines ***
2568 The presence of resent-headers in the message makes -t horribly ambiguous.
2569 Experiments with sendmail showed that it uses recipients for all resent-
2570 headers, totally ignoring the concept of "sets of resent- headers" as described
2571 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2572 with all the addresses in one instance of each header.
2574 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2575 error for -t if there were resent- headers in the message. However, after a
2576 discussion on the mailing list, I've learned that there are MUAs that use
2577 resent- headers with -t, and also that the stuff about sets of resent- headers
2578 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2579 message with -t and resent- header lines makes sure that only *its* resent-
2580 headers are present; previous ones are often renamed as X-resent- for example.
2582 Consequently, Exim has been changed so that, if any resent- header lines are
2583 present, the recipients are taken from all of the appropriate resent- lines,
2584 and not from the ordinary To:, Cc:, etc. */
2589 error_block **bnext = &bad_addresses;
2591 if (extract_addresses_remove_arguments)
2593 while (recipients_count-- > 0)
2595 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2596 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2597 tree_add_nonrecipient(s);
2599 recipients_list = NULL;
2600 recipients_count = recipients_list_max = 0;
2603 /* Now scan the headers */
2605 for (header_line * h = header_list->next; h; h = h->next)
2607 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2608 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2610 uschar *s = Ustrchr(h->text, ':') + 1;
2611 while (isspace(*s)) s++;
2613 f.parse_allow_group = TRUE; /* Allow address group syntax */
2617 uschar *ss = parse_find_address_end(s, FALSE);
2618 uschar *recipient, *errmess, *pp;
2619 int start, end, domain;
2621 /* Check on maximum */
2623 if (recipients_max > 0 && ++rcount > recipients_max)
2624 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2625 US"message rejected: ", error_rc, stdin, NULL);
2626 /* Does not return */
2628 /* Make a copy of the address, and remove any internal newlines. These
2629 may be present as a result of continuations of the header line. The
2630 white space that follows the newline must not be removed - it is part
2633 pp = recipient = store_get(ss - s + 1, s);
2634 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2639 BOOL b = allow_utf8_domains;
2640 allow_utf8_domains = TRUE;
2642 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2647 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2648 else allow_utf8_domains = b;
2654 /* Keep a list of all the bad addresses so we can send a single
2655 error message at the end. However, an empty address is not an error;
2656 just ignore it. This can come from an empty group list like
2658 To: Recipients of list:;
2660 If there are no recipients at all, an error will occur later. */
2662 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2664 int len = Ustrlen(s);
2665 error_block * b = store_get(sizeof(error_block), GET_UNTAINTED);
2666 while (len > 0 && isspace(s[len-1])) len--;
2668 b->text1 = string_printing(string_copyn(s, len));
2674 /* If the recipient is already in the nonrecipients tree, it must
2675 have appeared on the command line with the option extract_addresses_
2676 remove_arguments set. Do not add it to the recipients, and keep a note
2677 that this has happened, in order to give a better error if there are
2678 no recipients left. */
2682 if (tree_search(tree_nonrecipients, recipient) == NULL)
2683 receive_add_recipient(recipient, -1);
2685 extracted_ignored = TRUE;
2688 /* Move on past this address */
2690 s = ss + (*ss ? 1 : 0);
2691 while (isspace(*s)) s++;
2692 } /* Next address */
2694 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2695 f.parse_found_group = FALSE;
2697 /* If this was the bcc: header, mark it "old", which means it
2698 will be kept on the spool, but not transmitted as part of the
2701 if (h->type == htype_bcc) h->type = htype_old;
2702 } /* For appropriate header line */
2703 } /* For each header line */
2707 /* Now build the unique message id. This has changed several times over the
2708 lifetime of Exim, and is changing for Exim 4.97.
2709 The previous change was in about 2003.
2711 Detail for the pre-4.97 version is here in [square-brackets].
2713 The message ID has 3 parts: tttttt-ppppppppppp-ssss (6, 11, 4 - total 23 with
2714 the dashes). Each part is a number in base 62.
2715 [ tttttt-pppppp-ss 6, 6, 2 => 16 ]
2717 The first part is the current time, in seconds. Six chars is enough until
2718 year 3700 with case-sensitive filesystes, but will run out in 2038 on
2719 case-insensitive ones (Cygwin, Darwin - where we have to use base-36.
2720 Both of those are in the "unsupported" bucket, so ignore for now).
2722 The second part is the current pid, and supports 64b [31b] PIDs.
2724 The third part holds sub-second time, plus (when localhost_number is set)
2725 the host number multiplied by a number large enough to keep it away from
2726 the time portion. Host numbers are restricted to the range 0-16.
2727 The time resolution is variously 1, 2 or 4 microseconds [0.5 or 1 ms]
2728 depending on the use of localhost_nubmer and of case-insensitive filesystems.
2730 After a message has been received, Exim ensures that the timer has ticked at the
2731 appropriate level before proceeding, to avoid duplication if the pid happened to
2732 be re-used within the same time period. It seems likely that most messages will
2733 take at least half a millisecond to be received, so no delay will normally be
2734 necessary. At least for some time...
2736 Note that string_base62_XX() returns its data in a static storage block, so it
2737 must be copied before calling string_base62_XXX) again. It always returns exactly
2738 11 (_64) or 6 (_32) characters.
2740 There doesn't seem to be anything in the RFC which requires a message id to
2741 start with a letter, but Smail was changed to ensure this. The external form of
2742 the message id (as supplied by string expansion) therefore starts with an
2743 additional leading 'E'. The spool file names do not include this leading
2744 letter and it is not used internally.
2746 NOTE: If ever the format of message ids is changed, the regular expression for
2747 checking that a string is in this format must be updated in a corresponding
2748 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2749 must also be changed to reflect the correct string length. The queue-sort code
2750 needs to know the layout. Then, of course, other programs that rely on the
2751 message id format will need updating too (inc. at least exim_msgdate). */
2753 Ustrncpy(message_id, string_base62_32((long int)(message_id_tv.tv_sec)), MESSAGE_ID_TIME_LEN);
2754 message_id[MESSAGE_ID_TIME_LEN] = '-';
2755 Ustrncpy(message_id + MESSAGE_ID_TIME_LEN + 1,
2756 string_base62_64((long int)getpid()),
2760 /* Deal with the case where the host number is set. The value of the number was
2761 checked when it was read, to ensure it isn't too big. */
2763 if (host_number_string)
2764 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2765 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2766 string_base62_32((long int)(
2767 host_number * (1000000/id_resolution)
2768 + message_id_tv.tv_usec/id_resolution))
2769 + (6 - MESSAGE_ID_SUBTIME_LEN)
2772 /* Host number not set: final field is just the fractional time at an
2773 appropriate resolution. */
2776 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2777 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2778 string_base62_32((long int)(message_id_tv.tv_usec/id_resolution))
2779 + (6 - MESSAGE_ID_SUBTIME_LEN));
2781 /* Add the current message id onto the current process info string if
2784 (void)string_format(process_info + process_info_len,
2785 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2787 /* If we are using multiple input directories, set up the one for this message
2788 to be the least significant base-62 digit of the time of arrival. Otherwise
2789 ensure that it is an empty string. */
2791 set_subdir_str(message_subdir, message_id, 0);
2793 /* Now that we have the message-id, if there is no message-id: header, generate
2794 one, but only for local (without suppress_local_fixups) or submission mode
2795 messages. This can be user-configured if required, but we had better flatten
2796 any illegal characters therein. */
2799 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2801 uschar *id_text = US"";
2802 uschar *id_domain = primary_hostname;
2805 /* Permit only letters, digits, dots, and hyphens in the domain */
2807 if (message_id_domain)
2809 uschar *new_id_domain = expand_string(message_id_domain);
2812 if (!f.expand_string_forcedfail)
2813 log_write(0, LOG_MAIN|LOG_PANIC,
2814 "expansion of \"%s\" (message_id_header_domain) "
2815 "failed: %s", message_id_domain, expand_string_message);
2817 else if (*new_id_domain)
2819 id_domain = new_id_domain;
2820 for (uschar * p = id_domain; *p; p++)
2821 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2825 /* Permit all characters except controls and RFC 2822 specials in the
2826 additional text part. */
2828 if (message_id_text)
2830 uschar *new_id_text = expand_string(message_id_text);
2833 if (!f.expand_string_forcedfail)
2834 log_write(0, LOG_MAIN|LOG_PANIC,
2835 "expansion of \"%s\" (message_id_header_text) "
2836 "failed: %s", message_id_text, expand_string_message);
2838 else if (*new_id_text)
2840 id_text = new_id_text;
2841 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2845 /* Add the header line.
2846 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2847 appended, to preserve classical expectations of header ordering. */
2849 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2850 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2851 *id_text == 0 ? "" : ".", id_text, id_domain);
2853 /* Arrange for newly-created Message-Id to be logged */
2857 msgid_header_newly_created = TRUE;
2862 /* If we are to log recipients, keep a copy of the raw ones before any possible
2863 rewriting. Must copy the count, because later ACLs and the local_scan()
2864 function may mess with the real recipients. */
2866 if (LOGGING(received_recipients))
2868 raw_recipients = store_get(recipients_count * sizeof(uschar *), GET_UNTAINTED);
2869 for (int i = 0; i < recipients_count; i++)
2870 raw_recipients[i] = string_copy(recipients_list[i].address);
2871 raw_recipients_count = recipients_count;
2874 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2875 recipients will get here only if the conditions were right (allow_unqualified_
2876 recipient is TRUE). */
2879 { debug_printf_indent("qualify & rewrite recipients list\n"); acl_level++; }
2880 for (int i = 0; i < recipients_count; i++)
2881 recipients_list[i].address = /* deconst ok as src was not cont */
2882 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2883 global_rewrite_rules, rewrite_existflags);
2884 DEBUG(D_rewrite) acl_level--;
2886 /* If there is no From: header, generate one for local (without
2887 suppress_local_fixups) or submission_mode messages. If there is no sender
2888 address, but the sender is local or this is a local delivery error, use the
2889 originator login. This shouldn't happen for genuine bounces, but might happen
2890 for autoreplies. The addition of From: must be done *before* checking for the
2891 possible addition of a Sender: header, because untrusted_set_sender allows an
2892 untrusted user to set anything in the envelope (which might then get info
2893 From:) but we still want to ensure a valid Sender: if it is required. */
2896 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2898 const uschar * oname = US"";
2900 /* Use the originator_name if this is a locally submitted message and the
2901 caller is not trusted. For trusted callers, use it only if -F was used to
2902 force its value or if we have a non-SMTP message for which -f was not used
2903 to set the sender. */
2905 if (!sender_host_address)
2907 if (!f.trusted_caller || f.sender_name_forced ||
2908 (!smtp_input && !f.sender_address_forced))
2909 oname = originator_name;
2912 /* For non-locally submitted messages, the only time we use the originator
2913 name is when it was forced by the /name= option on control=submission. */
2915 else if (submission_name) oname = submission_name;
2917 /* Envelope sender is empty */
2919 if (!*sender_address)
2921 uschar *fromstart, *fromend;
2923 fromstart = string_sprintf("%sFrom: %s%s",
2924 resent_prefix, oname, *oname ? " <" : "");
2925 fromend = *oname ? US">" : US"";
2927 if (f.sender_local || f.local_error_message)
2928 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2929 local_part_quote(originator_login), qualify_domain_sender,
2932 else if (f.submission_mode && authenticated_id)
2934 if (!submission_domain)
2935 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2936 local_part_quote(authenticated_id), qualify_domain_sender,
2939 else if (!*submission_domain) /* empty => whole address set */
2940 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2944 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2945 local_part_quote(authenticated_id), submission_domain, fromend);
2947 from_header = header_last; /* To get it checked for Sender: */
2951 /* There is a non-null envelope sender. Build the header using the original
2952 sender address, before any rewriting that might have been done while
2957 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2960 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2963 from_header = header_last; /* To get it checked for Sender: */
2968 /* If the sender is local (without suppress_local_fixups), or if we are in
2969 submission mode and there is an authenticated_id, check that an existing From:
2970 is correct, and if not, generate a Sender: header, unless disabled. Any
2971 previously-existing Sender: header was removed above. Note that sender_local,
2972 as well as being TRUE if the caller of exim is not trusted, is also true if a
2973 trusted caller did not supply a -f argument for non-smtp input. To allow
2974 trusted callers to forge From: without supplying -f, we have to test explicitly
2975 here. If the From: header contains more than one address, then the call to
2976 parse_extract_address fails, and a Sender: header is inserted, as required. */
2979 && ( f.active_local_from_check
2980 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2981 || f.submission_mode && authenticated_id
2984 BOOL make_sender = TRUE;
2985 int start, end, domain;
2987 uschar *from_address =
2988 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2989 &start, &end, &domain, FALSE);
2990 uschar *generated_sender_address;
2992 generated_sender_address = f.submission_mode
2993 ? !submission_domain
2994 ? string_sprintf("%s@%s",
2995 local_part_quote(authenticated_id), qualify_domain_sender)
2996 : !*submission_domain /* empty => full address */
2997 ? string_sprintf("%s", authenticated_id)
2998 : string_sprintf("%s@%s",
2999 local_part_quote(authenticated_id), submission_domain)
3000 : string_sprintf("%s@%s",
3001 local_part_quote(originator_login), qualify_domain_sender);
3003 /* Remove permitted prefixes and suffixes from the local part of the From:
3004 address before doing the comparison with the generated sender. */
3009 uschar *at = domain ? from_address + domain - 1 : NULL;
3012 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
3013 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
3015 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
3016 from_address += slen;
3020 if ( strcmpic(generated_sender_address, from_address) == 0
3021 || (!domain && strcmpic(from_address, originator_login) == 0))
3022 make_sender = FALSE;
3025 /* We have to cause the Sender header to be rewritten if there are
3026 appropriate rewriting rules. */
3029 if (f.submission_mode && !submission_name)
3030 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
3031 generated_sender_address);
3033 header_add(htype_sender, "%sSender: %s <%s>\n",
3035 f.submission_mode ? submission_name : originator_name,
3036 generated_sender_address);
3038 /* Ensure that a non-null envelope sender address corresponds to the
3039 submission mode sender address. */
3041 if (f.submission_mode && *sender_address)
3043 if (!sender_address_unrewritten)
3044 sender_address_unrewritten = sender_address;
3045 sender_address = generated_sender_address;
3046 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3047 log_write(L_address_rewrite, LOG_MAIN,
3048 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3049 sender_address_unrewritten, generated_sender_address);
3053 /* If there are any rewriting rules, apply them to the sender address, unless
3054 it has already been rewritten as part of verification for SMTP input. */
3057 { debug_printf("global rewrite rules\n"); acl_level++; }
3058 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3060 /* deconst ok as src was not const */
3061 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3062 global_rewrite_rules, rewrite_existflags);
3063 DEBUG(D_receive|D_rewrite)
3064 debug_printf("rewritten sender = %s\n", sender_address);
3066 DEBUG(D_rewrite) acl_level--;
3069 /* The headers must be run through rewrite_header(), because it ensures that
3070 addresses are fully qualified, as well as applying any rewriting rules that may
3073 Qualification of header addresses in a message from a remote host happens only
3074 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3075 appropriate. For local messages, qualification always happens, unless -bnq is
3076 used to explicitly suppress it. No rewriting is done for an unqualified address
3077 that is left untouched.
3079 We start at the second header, skipping our own Received:. This rewriting is
3080 documented as happening *after* recipient addresses are taken from the headers
3081 by the -t command line option. An added Sender: gets rewritten here. */
3084 { debug_printf("rewrite headers\n"); acl_level++; }
3085 for (header_line * h = header_list->next, * newh; h; h = h->next)
3086 if ((newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3087 rewrite_existflags, TRUE)))
3089 DEBUG(D_rewrite) acl_level--;
3092 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3093 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3094 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3095 exists, this applies to the set of resent- headers rather than the normal set.
3097 The requirement for a recipient header has been removed in RFC 2822. At this
3098 point in the code, earlier versions of Exim added a To: header for locally
3099 submitted messages, and an empty Bcc: header for others. In the light of the
3100 changes in RFC 2822, this was dropped in November 2003. */
3103 /* If there is no date header, generate one if the message originates locally
3104 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3105 submission mode flag is set. Messages without Date: are not valid, but it seems
3106 to be more confusing if Exim adds one to all remotely-originated messages.
3107 As per Message-Id, we prepend if resending, else append.
3110 if ( !date_header_exists
3111 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3112 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3113 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3115 search_tidyup(); /* Free any cached resources */
3117 /* Show the complete set of headers if debugging. Note that the first one (the
3118 new Received:) has not yet been set. */
3122 debug_printf(">>Headers after rewriting and local additions:\n");
3123 for (header_line * h = header_list->next; h; h = h->next)
3124 debug_printf("%c %s", h->type, h->text);
3128 /* The headers are now complete in store. If we are running in filter
3129 testing mode, that is all this function does. Return TRUE if the message
3130 ended with a dot. */
3132 if (filter_test != FTEST_NONE)
3134 process_info[process_info_len] = 0;
3135 return message_ended == END_DOT;
3138 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3139 think more if it could be handled. Cannot do onward CHUNKING unless
3140 inbound is, but inbound chunking ought to be ok with outbound plain.
3141 Could we do onward CHUNKING given inbound CHUNKING?
3143 if (chunking_state > CHUNKING_OFFERED)
3144 cancel_cutthrough_connection(FALSE, US"chunking active");
3146 /* Cutthrough delivery:
3147 We have to create the Received header now rather than at the end of reception,
3148 so the timestamp behaviour is a change to the normal case.
3149 Having created it, send the headers to the destination. */
3151 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3153 if (received_count > received_headers_max)
3155 cancel_cutthrough_connection(TRUE, US"too many headers");
3156 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3157 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3158 "Too many \"Received\" headers",
3160 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3161 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3162 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3163 goto NOT_ACCEPTED; /* Skip to end of function */
3165 received_header_gen();
3166 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3167 (void) cutthrough_headers_send();
3171 /* Open a new spool file for the data portion of the message. We need
3172 to access it both via a file descriptor and a stream. Try to make the
3173 directory if it isn't there. */
3175 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3176 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3178 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3180 if (errno == ENOENT)
3182 (void) directory_make(spool_directory,
3183 spool_sname(US"input", message_subdir),
3184 INPUT_DIRECTORY_MODE, TRUE);
3185 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3188 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3189 spool_name, strerror(errno));
3192 /* Make sure the file's group is the Exim gid, and double-check the mode
3193 because the group setting doesn't always get set automatically. */
3195 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3196 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3197 "Failed setting ownership on spool file %s: %s",
3198 spool_name, strerror(errno));
3199 (void)fchmod(data_fd, SPOOL_MODE);
3201 /* We now have data file open. Build a stream for it and lock it. We lock only
3202 the first line of the file (containing the message ID) because otherwise there
3203 are problems when Exim is run under Cygwin (I'm told). See comments in
3204 spool_in.c, where the same locking is done. */
3206 spool_data_file = fdopen(data_fd, "w+");
3207 lock_data.l_type = F_WRLCK;
3208 lock_data.l_whence = SEEK_SET;
3209 lock_data.l_start = 0;
3210 lock_data.l_len = spool_data_start_offset(message_id);
3212 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3213 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3214 errno, strerror(errno));
3216 /* We have an open, locked data file. Write the message id to it to make it
3217 self-identifying. Then read the remainder of the input of this message and
3218 write it to the data file. If the variable next != NULL, it contains the first
3219 data line (which was read as a header but then turned out not to have the right
3220 format); write it (remembering that it might contain binary zeros). The result
3221 of fwrite() isn't inspected; instead we call ferror() below. */
3223 fprintf(spool_data_file, "%s-D\n", message_id);
3226 uschar *s = next->text;
3227 int len = next->slen;
3228 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3229 body_linecount++; /* Assumes only 1 line */
3232 /* Note that we might already be at end of file, or the logical end of file
3233 (indicated by '.'), or might have encountered an error while writing the
3234 message id or "next" line. */
3236 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3240 message_ended = chunking_state <= CHUNKING_OFFERED
3241 ? read_message_data_smtp(spool_data_file)
3243 ? read_message_bdat_smtp_wire(spool_data_file)
3244 : read_message_bdat_smtp(spool_data_file);
3245 receive_linecount++; /* The terminating "." line */
3248 message_ended = read_message_data(spool_data_file);
3250 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3251 message_linecount += body_linecount;
3253 switch (message_ended)
3255 /* Handle premature termination of SMTP */
3260 Uunlink(spool_name); /* Lose data file when closed */
3261 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3262 smtp_reply = handle_lost_connection(US"");
3264 goto NOT_ACCEPTED; /* Skip to end of function */
3268 /* Handle message that is too big. Don't use host_or_ident() in the log
3269 message; we want to see the ident value even for non-remote messages. */
3272 Uunlink(spool_name); /* Lose the data file when closed */
3273 cancel_cutthrough_connection(TRUE, US"mail too big");
3274 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3276 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3277 "message too big: read=%d max=%d",
3279 sender_fullhost ? " H=" : "",
3280 sender_fullhost ? sender_fullhost : US"",
3281 sender_ident ? " U=" : "",
3282 sender_ident ? sender_ident : US"",
3284 thismessage_size_limit);
3288 smtp_reply = US"552 Message size exceeds maximum permitted";
3289 goto NOT_ACCEPTED; /* Skip to end of function */
3293 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3294 give_local_error(ERRMESS_TOOBIG,
3295 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3296 US"message rejected: ", error_rc, spool_data_file, header_list);
3297 /* Does not return */
3301 /* Handle bad BDAT protocol sequence */
3304 Uunlink(spool_name); /* Lose the data file when closed */
3305 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3306 smtp_reply = US""; /* Response already sent */
3307 goto NOT_ACCEPTED; /* Skip to end of function */
3311 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3312 example, there may be some expansion in an ACL that uses a timer.) */
3314 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3316 /* The message body has now been read into the data file. Call fflush() to
3317 empty the buffers in C, and then call fsync() to get the data written out onto
3318 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3319 having to do this). If there was an I/O error on either input or output,
3320 attempt to send an error message, and unlink the spool file. For non-SMTP input
3321 we can then give up. Note that for SMTP input we must swallow the remainder of
3322 the input in cases of output errors, since the far end doesn't expect to see
3323 anything until the terminating dot line is sent. */
3325 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3326 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3328 uschar *msg_errno = US strerror(errno);
3329 BOOL input_error = (receive_ferror)() != 0;
3330 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3331 input_error? "Input read" : "Spool write",
3333 sender_fullhost ? sender_fullhost : sender_ident);
3335 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3336 Uunlink(spool_name); /* Lose the data file */
3337 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3342 smtp_reply = US"451 Error while reading input data";
3345 smtp_reply = US"451 Error while writing spool file";
3346 receive_swallow_smtp();
3348 goto NOT_ACCEPTED; /* Skip to end of function */
3353 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3354 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3356 /* Does not return */
3361 /* No I/O errors were encountered while writing the data file. */
3363 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3364 gettimeofday(&received_time_complete, NULL);
3367 /* If there were any bad addresses extracted by -t, or there were no recipients
3368 left after -t, send a message to the sender of this message, or write it to
3369 stderr if the error handling option is set that way. Note that there may
3370 legitimately be no recipients for an SMTP message if they have all been removed
3373 We need to rewind the data file in order to read it. In the case of no
3374 recipients or stderr error writing, throw the data file away afterwards, and
3375 exit. (This can't be SMTP, which always ensures there's at least one
3376 syntactically good recipient address.) */
3378 if (extract_recip && (bad_addresses || recipients_count == 0))
3382 if (recipients_count == 0) debug_printf("*** No recipients\n");
3385 debug_printf("*** Bad address(es)\n");
3386 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3387 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3391 log_write(0, LOG_MAIN|LOG_PANIC, "%s found in headers",
3392 bad_addresses ? "bad addresses" : "no recipients");
3394 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3396 /* If configured to send errors to the sender, but this fails, force
3397 a failure error code. We use a special one for no recipients so that it
3398 can be detected by the autoreply transport. Otherwise error_rc is set to
3399 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3400 it is EXIT_SUCCESS. */
3402 if (error_handling == ERRORS_SENDER)
3404 if (!moan_to_sender(
3406 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3407 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3408 bad_addresses, header_list, spool_data_file, FALSE
3410 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3415 if (extracted_ignored)
3416 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3418 fprintf(stderr, "exim: no recipients in message\n");
3421 fprintf(stderr, "exim: invalid address%s",
3422 bad_addresses->next ? "es:\n" : ":");
3423 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3424 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3425 bad_addresses->text2);
3429 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3431 Uunlink(spool_name);
3432 (void)fclose(spool_data_file);
3433 exim_exit(error_rc);
3437 /* Data file successfully written. Generate text for the Received: header by
3438 expanding the configured string, and adding a timestamp. By leaving this
3439 operation till now, we ensure that the timestamp is the time that message
3440 reception was completed. However, this is deliberately done before calling the
3441 data ACL and local_scan().
3443 This Received: header may therefore be inspected by the data ACL and by code in
3444 the local_scan() function. When they have run, we update the timestamp to be
3445 the final time of reception.
3447 If there is just one recipient, set up its value in the $received_for variable
3448 for use when we generate the Received: header.
3450 Note: the checking for too many Received: headers is handled by the delivery
3452 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3454 if (!received_header->text) /* Non-cutthrough case */
3456 received_header_gen();
3458 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3460 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3461 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3463 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3464 now, before running the DATA ACL. */
3466 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3469 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3470 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3472 /* If an ACL is specified for checking things at this stage of reception of a
3473 message, run it, unless all the recipients were removed by "discard" in earlier
3474 ACLs. That is the only case in which recipients_count can be zero at this
3475 stage. Set deliver_datafile to point to the data file so that $message_body and
3476 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3479 deliver_datafile = data_fd;
3482 f.enable_dollar_recipients = TRUE;
3484 if (recipients_count == 0)
3485 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3489 /* Handle interactive SMTP messages */
3491 if (smtp_input && !smtp_batched_input)
3494 #ifndef DISABLE_DKIM
3495 if (!f.dkim_disable_verify)
3497 /* Finish verification */
3498 dkim_exim_verify_finish();
3500 /* Check if we must run the DKIM ACL */
3501 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3503 uschar * dkim_verify_signers_expanded =
3504 expand_string(dkim_verify_signers);
3505 gstring * results = NULL;
3509 gstring * seen_items = NULL;
3510 int old_pool = store_pool;
3512 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3514 if (!(ptr = dkim_verify_signers_expanded))
3515 log_write(0, LOG_MAIN|LOG_PANIC,
3516 "expansion of dkim_verify_signers option failed: %s",
3517 expand_string_message);
3519 /* Default to OK when no items are present */
3521 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3523 /* Prevent running ACL for an empty item */
3524 if (!item || !*item) continue;
3526 /* Only run ACL once for each domain or identity,
3527 no matter how often it appears in the expanded list. */
3531 const uschar * seen_items_list = string_from_gstring(seen_items);
3533 BOOL seen_this_item = FALSE;
3535 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3537 if (Ustrcmp(seen_item,item) == 0)
3539 seen_this_item = TRUE;
3546 debug_printf("acl_smtp_dkim: skipping signer %s, "
3547 "already seen\n", item);
3551 seen_items = string_catn(seen_items, US":", 1);
3553 seen_items = string_cat(seen_items, item);
3555 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3559 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3560 "skipping remaining items\n", rc, item);
3561 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3565 dkim_verify_status = string_from_gstring(results);
3566 store_pool = old_pool;
3567 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3570 recipients_count = 0;
3571 blackholed_by = US"DKIM ACL";
3573 blackhole_log_msg = string_sprintf(": %s", log_msg);
3577 Uunlink(spool_name);
3578 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3579 smtp_yield = FALSE; /* No more messages after dropped connection */
3580 smtp_reply = US""; /* Indicate reply already sent */
3581 goto NOT_ACCEPTED; /* Skip to end of function */
3585 dkim_exim_verify_log_all();
3587 #endif /* DISABLE_DKIM */
3589 #ifdef WITH_CONTENT_SCAN
3590 if ( recipients_count > 0
3592 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3595 #endif /* WITH_CONTENT_SCAN */
3597 #ifdef SUPPORT_DMARC
3598 dmarc_store_data(from_header);
3601 #ifndef DISABLE_PRDR
3602 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3605 int all_fail = FAIL;
3607 smtp_printf("353 PRDR content analysis beginning\r\n", SP_MORE);
3608 /* Loop through recipients, responses must be in same order received */
3609 for (unsigned int c = 0; recipients_count > c; c++)
3611 const uschar * addr = recipients_list[c].address;
3612 uschar * msg= US"PRDR R=<%s> %s";
3615 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3616 addr, c+1, recipients_count);
3617 rc = acl_check(ACL_WHERE_PRDR, addr,
3618 acl_smtp_data_prdr, &user_msg, &log_msg);
3620 /* If any recipient rejected content, indicate it in final message */
3622 /* If all recipients rejected, indicate in final message */
3627 case OK: case DISCARD: code = US"250"; break;
3628 case DEFER: code = US"450"; break;
3629 default: code = US"550"; break;
3631 if (user_msg != NULL)
3632 smtp_user_msg(code, user_msg);
3637 case OK: case DISCARD:
3638 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3640 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3642 msg = string_sprintf(CS msg, addr, "refusal"); break;
3644 smtp_user_msg(code, msg);
3646 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3647 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3648 else log_write(0, LOG_MAIN, "%s", CS msg);
3650 if (rc != OK) { receive_remove_recipient(addr); c--; }
3652 /* Set up final message, used if data acl gives OK */
3653 smtp_reply = string_sprintf("%s id=%s message %s",
3654 all_fail == FAIL ? US"550" : US"250",
3657 ? US"rejected for all recipients"
3660 : US"accepted for some recipients");
3661 if (recipients_count == 0)
3665 prdr_requested = FALSE;
3666 #endif /* !DISABLE_PRDR */
3668 /* Check the recipients count again, as the MIME ACL might have changed
3671 if (acl_smtp_data && recipients_count > 0)
3673 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3674 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3677 recipients_count = 0;
3678 blackholed_by = US"DATA ACL";
3680 blackhole_log_msg = string_sprintf(": %s", log_msg);
3681 cancel_cutthrough_connection(TRUE, US"data acl discard");
3685 Uunlink(spool_name);
3686 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3687 #ifdef WITH_CONTENT_SCAN
3690 #ifdef EXPERIMENTAL_DCC
3693 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3694 smtp_yield = FALSE; /* No more messages after dropped connection */
3695 smtp_reply = US""; /* Indicate reply already sent */
3696 goto NOT_ACCEPTED; /* Skip to end of function */
3701 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3702 we cannot take different actions for permanent and temporary rejections. */
3707 #ifdef WITH_CONTENT_SCAN
3708 if ( acl_not_smtp_mime
3709 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3713 #endif /* WITH_CONTENT_SCAN */
3717 uschar *user_msg, *log_msg;
3718 f.authentication_local = TRUE;
3719 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3722 recipients_count = 0;
3723 blackholed_by = US"non-SMTP ACL";
3725 blackhole_log_msg = string_sprintf(": %s", log_msg);
3729 Uunlink(spool_name);
3730 #ifdef WITH_CONTENT_SCAN
3733 #ifdef EXPERIMENTAL_DCC
3736 /* The ACL can specify where rejections are to be logged, possibly
3737 nowhere. The default is main and reject logs. */
3739 if (log_reject_target)
3740 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3741 sender_address, log_msg);
3743 if (!user_msg) user_msg = US"local configuration problem";
3744 if (smtp_batched_input)
3745 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3746 /* Does not return */
3749 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3750 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3751 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3753 /* Does not return */
3756 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3760 /* The applicable ACLs have been run */
3762 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3763 if (f.queue_only_policy) queued_by = US"ACL";
3766 #ifdef WITH_CONTENT_SCAN
3770 #ifdef EXPERIMENTAL_DCC
3775 #ifdef HAVE_LOCAL_SCAN
3776 /* The final check on the message is to run the scan_local() function. The
3777 version supplied with Exim always accepts, but this is a hook for sysadmins to
3778 supply their own checking code. The local_scan() function is run even when all
3779 the recipients have been discarded. */
3781 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3783 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3784 deleted, and the incident gets logged. */
3786 if (sigsetjmp(local_scan_env, 1) == 0)
3788 had_local_scan_crash = 0;
3789 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3790 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3791 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3792 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3794 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3795 local_scan_timeout);
3796 local_scan_data = NULL;
3798 had_local_scan_timeout = 0;
3799 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3800 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3801 rc = local_scan(data_fd, &local_scan_data);
3803 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3805 f.enable_dollar_recipients = FALSE;
3807 store_pool = POOL_MAIN; /* In case changed */
3808 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3811 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3812 os_non_restarting_signal(SIGFPE, SIG_DFL);
3813 os_non_restarting_signal(SIGILL, SIG_DFL);
3814 os_non_restarting_signal(SIGBUS, SIG_DFL);
3818 if (had_local_scan_crash)
3820 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3821 "signal %d - message temporarily rejected (size %d)",
3822 had_local_scan_crash, message_size);
3823 receive_bomb_out(US"local-scan-error", US"local verification problem");
3824 /* Does not return */
3826 if (had_local_scan_timeout)
3828 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3829 "message temporarily rejected (size %d)", message_size);
3830 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3831 /* Does not return */
3835 /* The length check is paranoia against some runaway code, and also because
3836 (for a success return) lines in the spool file are read into big_buffer. */
3838 if (local_scan_data)
3840 int len = Ustrlen(local_scan_data);
3841 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3842 local_scan_data = string_copyn(local_scan_data, len);
3845 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3847 if (!f.deliver_freeze) /* ACL might have already frozen */
3849 f.deliver_freeze = TRUE;
3850 deliver_frozen_at = time(NULL);
3851 frozen_by = US"local_scan()";
3853 rc = LOCAL_SCAN_ACCEPT;
3855 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3857 if (!f.queue_only_policy) /* ACL might have already queued */
3859 f.queue_only_policy = TRUE;
3860 queued_by = US"local_scan()";
3862 rc = LOCAL_SCAN_ACCEPT;
3865 /* Message accepted: remove newlines in local_scan_data because otherwise
3866 the spool file gets corrupted. Ensure that all recipients are qualified. */
3868 if (rc == LOCAL_SCAN_ACCEPT)
3870 if (local_scan_data)
3871 for (uschar * s = local_scan_data; *s; s++) if (*s == '\n') *s = ' ';
3872 for (recipient_item * r = recipients_list;
3873 r < recipients_list + recipients_count; r++)
3875 r->address = rewrite_address_qualify(r->address, TRUE);
3877 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3879 if (recipients_count == 0 && !blackholed_by)
3880 blackholed_by = US"local_scan";
3883 /* Message rejected: newlines permitted in local_scan_data to generate
3884 multiline SMTP responses. */
3888 uschar *istemp = US"";
3892 errmsg = local_scan_data;
3894 Uunlink(spool_name); /* Cancel this message */
3898 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3899 "rejection given", rc);
3902 case LOCAL_SCAN_REJECT_NOLOGHDR:
3903 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3906 case LOCAL_SCAN_REJECT:
3907 smtp_code = US"550";
3908 if (!errmsg) errmsg = US"Administrative prohibition";
3911 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3912 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3915 case LOCAL_SCAN_TEMPREJECT:
3917 smtp_code = US"451";
3918 if (!errmsg) errmsg = US"Temporary local problem";
3919 istemp = US"temporarily ";
3923 g = string_append(NULL, 2, US"F=", *sender_address ? sender_address : US"<>");
3924 g = add_host_info_for_log(g);
3926 log_write(0, LOG_MAIN|LOG_REJECT, "%Y %srejected by local_scan(): %.256s",
3927 g, istemp, string_printing(errmsg));
3930 if (!smtp_batched_input)
3932 smtp_respond(smtp_code, 3, SR_FINAL, errmsg);
3933 smtp_reply = US""; /* Indicate reply already sent */
3934 goto NOT_ACCEPTED; /* Skip to end of function */
3937 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3938 /* Does not return */
3941 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3942 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3943 US"message rejected by local scan code: ", error_rc, spool_data_file,
3945 /* Does not return */
3949 /* Reset signal handlers to ignore signals that previously would have caused
3950 the message to be abandoned. */
3952 signal(SIGTERM, SIG_IGN);
3953 signal(SIGINT, SIG_IGN);
3954 #endif /* HAVE_LOCAL_SCAN */
3956 /* If we are faking a reject or defer, avoid sennding a DSN for the
3957 actually-accepted message */
3959 if (fake_response != OK)
3960 for (recipient_item * r = recipients_list;
3961 r < recipients_list + recipients_count; r++)
3963 DEBUG(D_receive) if (r->dsn_flags & (rf_notify_success | rf_notify_delay))
3964 debug_printf("DSN: clearing flags due to fake-response for message\n");
3965 r->dsn_flags = r->dsn_flags & ~(rf_notify_success | rf_notify_delay)
3970 /* Ensure the first time flag is set in the newly-received message. */
3972 f.deliver_firsttime = TRUE;
3974 #ifdef EXPERIMENTAL_BRIGHTMAIL
3976 { /* rewind data file */
3977 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3978 bmi_verdicts = bmi_process_message(header_list, data_fd);
3982 /* Update the timestamp in our Received: header to account for any time taken by
3983 an ACL or by local_scan(). The new time is the time that all reception
3984 processing is complete. */
3986 timestamp = expand_string(US"${tod_full}");
3987 tslen = Ustrlen(timestamp);
3989 memcpy(received_header->text + received_header->slen - tslen - 1,
3992 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3996 f.deliver_freeze = FALSE;
3997 f.queue_only_policy = FALSE;
4000 /* Keep the data file open until we have written the header file, in order to
4001 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
4002 don't write the header file, and we unlink the data file. If writing the header
4003 file fails, we have failed to accept this message. */
4005 if (host_checking || blackholed_by)
4007 Uunlink(spool_name);
4008 msg_size = 0; /* Compute size for log line */
4009 for (header_line * h = header_list; h; h = h->next)
4010 if (h->type != '*') msg_size += h->slen;
4013 /* Write the -H file */
4016 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
4018 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
4019 Uunlink(spool_name); /* Lose the data file */
4023 smtp_reply = US"451 Error in writing spool file";
4028 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4029 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4031 /* Does not return */
4036 /* The message has now been successfully received. */
4038 receive_messagecount++;
4040 if (fflush(spool_data_file))
4042 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4043 log_write(0, LOG_MAIN, "%s\n", errmsg);
4044 Uunlink(spool_name); /* Lose the data file */
4048 smtp_reply = US"451 Error in writing spool file";
4053 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4054 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4056 /* Does not return */
4060 /* Add data size to written header size. We do not count the initial file name
4061 that is in the file, but we do add one extra for the notional blank line that
4062 precedes the data. This total differs from message_size in that it include the
4063 added Received: header and any other headers that got created locally. */
4065 fstat(data_fd, &statbuf);
4066 msg_size += statbuf.st_size - spool_data_start_offset(message_id) + 1;
4068 /* Generate a "message received" log entry. We do this by building up a dynamic
4069 string as required. We log the arrival of a new message while the
4070 file is still locked, just in case the machine is *really* fast, and delivers
4071 it first! Include any message id that is in the message - since the syntax of a
4072 message id is actually an addr-spec, we can use the parse routine to canonicalize
4075 rcvd_log_reset_point = store_mark();
4076 g = string_get(256);
4078 g = string_append(g, 2,
4079 fake_response == FAIL ? US"(= " : US"<= ",
4080 *sender_address ? sender_address : US"<>");
4081 if (message_reference)
4082 g = string_append(g, 2, US" R=", message_reference);
4084 g = add_host_info_for_log(g);
4087 if (LOGGING(tls_cipher) && tls_in.cipher)
4089 g = string_append(g, 2, US" X=", tls_in.cipher);
4090 # ifndef DISABLE_TLS_RESUME
4091 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4092 g = string_catn(g, US"*", 1);
4095 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4096 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4097 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4098 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4099 if (LOGGING(tls_sni) && tls_in.sni)
4100 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4103 if (sender_host_authenticated)
4105 g = string_append(g, 2, US" A=", sender_host_authenticated);
4106 if (authenticated_id)
4108 g = string_append(g, 2, US":", authenticated_id);
4109 if (LOGGING(smtp_mailauth) && authenticated_sender)
4110 g = string_append(g, 2, US":", authenticated_sender);
4114 #ifndef DISABLE_PRDR
4116 g = string_catn(g, US" PRDR", 5);
4119 #ifdef SUPPORT_PROXY
4120 if (proxy_session && LOGGING(proxy))
4121 g = string_append(g, 2, US" PRX=", proxy_local_address);
4124 if (chunking_state > CHUNKING_OFFERED)
4125 g = string_catn(g, US" K", 2);
4127 g = string_fmt_append(g, " S=%d", msg_size);
4129 /* log 8BITMIME mode announced in MAIL_FROM
4133 if (LOGGING(8bitmime))
4134 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4136 #ifndef DISABLE_DKIM
4137 if (LOGGING(dkim) && dkim_verify_overall)
4138 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4139 # ifdef EXPERIMENTAL_ARC
4140 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4141 g = string_catn(g, US" ARC", 4);
4145 if (LOGGING(receive_time))
4147 struct timeval diff = received_time_complete;
4148 timediff(&diff, &received_time);
4149 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4153 g = string_append(g, 2, US" Q=", queue_name);
4155 /* If an addr-spec in a message-id contains a quoted string, it can contain
4156 any characters except " \ and CR and so in particular it can contain NL!
4157 Therefore, make sure we use a printing-characters only version for the log.
4158 Also, allow for domain literals in the message id. */
4160 if ( LOGGING(msg_id) && msgid_header
4161 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4165 BOOL save_allow_domain_literals = allow_domain_literals;
4166 allow_domain_literals = TRUE;
4167 int start, end, domain;
4169 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4170 &errmsg, &start, &end, &domain, FALSE);
4171 allow_domain_literals = save_allow_domain_literals;
4173 g = string_append(g, 2,
4174 msgid_header_newly_created ? US" id*=" : US" id=",
4175 string_printing(old_id));
4178 /* If subject logging is turned on, create suitable printing-character
4179 text. By expanding $h_subject: we make use of the MIME decoding. */
4181 if (LOGGING(subject) && subject_header)
4183 uschar *p = big_buffer;
4184 uschar *ss = expand_string(US"$h_subject:");
4186 /* Backslash-quote any double quotes or backslashes so as to make a
4187 a C-like string, and turn any non-printers into escape sequences. */
4190 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4192 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4197 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4200 /* Terminate the string: string_cat() and string_append() leave room, but do
4201 not put the zero in. */
4203 (void) string_from_gstring(g);
4205 /* Create a message log file if message logs are being used and this message is
4206 not blackholed. Write the reception stuff to it. We used to leave message log
4207 creation until the first delivery, but this has proved confusing for some
4210 if (message_logs && !blackholed_by)
4213 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4215 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4219 (void)directory_make(spool_directory,
4220 spool_sname(US"msglog", message_subdir),
4221 MSGLOG_DIRECTORY_MODE, TRUE);
4222 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4226 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4227 m_name, strerror(errno));
4230 FILE *message_log = fdopen(fd, "a");
4233 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4234 m_name, strerror(errno));
4239 uschar * now = tod_stamp(tod_log);
4240 /* Drop the initial "<= " */
4241 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4242 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4244 if (f.queue_only_policy) fprintf(message_log,
4245 "%s no immediate delivery: queued%s%s by %s\n", now,
4246 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4248 (void)fclose(message_log);
4253 /* Everything has now been done for a successful message except logging its
4254 arrival, and outputting an SMTP response. While writing to the log, set a flag
4255 to cause a call to receive_bomb_out() if the log cannot be opened. */
4257 f.receive_call_bombout = TRUE;
4259 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4260 connection has gone away. This can only be done if there is no unconsumed input
4261 waiting in the local input buffer. We can test for this by calling
4262 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4263 input to be sent following the final dot, so the presence of following input is
4266 If the connection is still present, but there is no unread input for the
4267 socket, the result of a select() call will be zero. If, however, the connection
4268 has gone away, or if there is pending input, the result of select() will be
4269 non-zero. The two cases can be distinguished by trying to read the next input
4270 character. If we succeed, we can unread it so that it remains in the local
4271 buffer for handling later. If not, the connection has been lost.
4273 Of course, since TCP/IP is asynchronous, there is always a chance that the
4274 connection will vanish between the time of this test and the sending of the
4275 response, but the chance of this happening should be small. */
4277 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4280 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4282 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4283 if (c != EOF) (receive_ungetc)(c);
4286 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4287 smtp_reply = US""; /* No attempt to send a response */
4288 smtp_yield = FALSE; /* Nothing more on this connection */
4290 /* Re-use the log line workspace */
4293 g = string_cat(g, US"SMTP connection lost after final dot");
4294 g = add_host_info_for_log(g);
4295 log_write(0, LOG_MAIN, "%Y", g);
4297 /* Delete the files for this aborted message. */
4299 Uunlink(spool_name);
4300 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4301 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4308 /* The connection has not gone away; we really are going to take responsibility
4309 for this message. */
4311 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4314 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4315 the sender's dot (below).
4316 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4317 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4318 in which case pass temp-reject back to initiator and dump the files.
4320 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4322 XXX We do not handle queue-only, freezing, or blackholes.
4324 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4326 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4327 /* Logging was done in finaldot() */
4330 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4331 cutthrough_done = ACCEPTED;
4332 break; /* message_id needed for SMTP accept below */
4334 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4335 ... for which, pass back the exact error */
4336 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4337 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4338 break; /* message_id needed for SMTP accept below */
4340 default: /* Unknown response, or error. Treat as temp-reject. */
4341 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4342 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4343 break; /* message_id needed for SMTP accept below */
4345 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4346 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4347 cutthrough_done = PERM_REJ;
4352 #ifndef DISABLE_PRDR
4353 if(!smtp_reply || prdr_requested)
4358 log_write(0, LOG_MAIN |
4359 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4360 (LOGGING(received_sender) ? LOG_SENDER : 0),
4363 /* Log any control actions taken by an ACL or local_scan(). */
4365 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4366 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4367 "no immediate delivery: queued%s%s by %s",
4368 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4371 f.receive_call_bombout = FALSE;
4373 /* The store for the main log message can be reused */
4374 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4376 /* If the message is frozen, and freeze_tell is set, do the telling. */
4378 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4379 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4380 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4381 message_id, frozen_by, sender_address);
4384 /* Either a message has been successfully received and written to the two spool
4385 files, or an error in writing the spool has occurred for an SMTP message, or
4386 an SMTP message has been rejected for policy reasons, or a message was passed on
4387 by cutthrough delivery. (For a non-SMTP message we will have already given up
4388 because there's no point in carrying on!) For non-cutthrough we must now close
4389 (and thereby unlock) the data file. In the successful case, this leaves the
4390 message on the spool, ready for delivery. In the error case, the spool file will
4391 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4394 For cutthrough we hold the data file locked until we have deleted it, otherwise
4395 a queue-runner could grab it in the window.
4397 A fflush() was done earlier in the expectation that any write errors on the
4398 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4399 possible for fclose() to fail - and this has been seen on obscure filesystems
4400 (probably one that delayed the actual media write as long as possible)
4401 but what to do? What has happened to the lock if this happens?
4402 It's a mess because we already logged the acceptance.
4403 We can at least log the issue, try to remove spoolfiles and respond with
4404 a temp-reject. We do not want to close before logging acceptance because
4405 we want to hold the lock until we know that logging worked.
4406 Could we make this less likely by doing an fdatasync() just after the fflush()?
4407 That seems like a good thing on data-security grounds, but how much will it hit
4414 message_id[0] = 0; /* Indicate no message accepted */
4417 process_info[process_info_len] = 0; /* Remove message id */
4418 if (spool_data_file && cutthrough_done == NOT_TRIED)
4420 if (fclose(spool_data_file)) /* Frees the lock */
4422 log_msg = string_sprintf("spoolfile error on close: %s", strerror(errno));
4423 log_write(0, LOG_MAIN|LOG_PANIC |
4424 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4425 (LOGGING(received_sender) ? LOG_SENDER : 0),
4427 log_write(0, LOG_MAIN |
4428 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4429 (LOGGING(received_sender) ? LOG_SENDER : 0),
4430 "rescind the above message-accept");
4432 Uunlink(spool_name);
4433 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4434 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4436 /* Claim a data ACL temp-reject, just to get reject logging and response */
4437 if (smtp_input) smtp_handle_acl_fail(ACL_WHERE_DATA, rc, NULL, log_msg);
4438 smtp_reply = US""; /* Indicate reply already sent */
4440 message_id[0] = 0; /* no message accepted */
4442 spool_data_file = NULL;
4445 /* Now reset signal handlers to their defaults */
4447 signal(SIGTERM, SIG_DFL);
4448 signal(SIGINT, SIG_DFL);
4450 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4451 value, which defaults TRUE - meaning there may be more incoming messages from
4452 this connection. For non-SMTP callers (where there is only ever one message),
4453 the default is FALSE. */
4459 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4460 is set to the response that should be sent. When it is NULL, we generate
4461 default responses. After an ACL error or local_scan() error, the response has
4462 already been sent, and smtp_reply is an empty string to indicate this. */
4464 if (!smtp_batched_input)
4468 if (fake_response != OK)
4469 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4470 3, SR_FINAL, fake_response_text);
4472 /* An OK response is required; use "message" text if present. */
4476 uschar *code = US"250";
4478 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4479 smtp_respond(code, len, SR_FINAL, user_msg);
4482 /* Default OK response */
4484 else if (chunking_state > CHUNKING_OFFERED)
4486 /* If there is more input waiting, no need to flush (probably the client
4487 pipelined QUIT after data). We check only the in-process buffer, not
4490 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4492 chunking_datasize, message_size+message_linecount, message_id);
4493 chunking_state = CHUNKING_OFFERED;
4496 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4500 "\n**** SMTP testing: that is not a real message id!\n\n");
4503 /* smtp_reply is set non-empty */
4505 else if (smtp_reply[0] != 0)
4506 if (fake_response != OK && smtp_reply[0] == '2')
4507 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4508 3, SR_FINAL, fake_response_text);
4510 smtp_printf("%.1024s\r\n", SP_NO_MORE, smtp_reply);
4512 switch (cutthrough_done)
4515 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4517 /* Delete spool files */
4518 Uunlink(spool_name);
4519 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4520 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4524 if (cutthrough.defer_pass)
4526 Uunlink(spool_name);
4527 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4528 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4533 if (cutthrough_done != NOT_TRIED)
4535 if (spool_data_file)
4537 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4538 spool_data_file = NULL;
4540 message_id[0] = 0; /* Prevent a delivery from starting */
4541 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4542 cutthrough.defer_pass = FALSE;
4546 /* For batched SMTP, generate an error message on failure, and do
4547 nothing on success. The function moan_smtp_batch() does not return -
4548 it exits from the program with a non-zero return code. */
4550 else if (smtp_reply)
4551 moan_smtp_batch(NULL, "%s", smtp_reply);
4555 /* If blackholing, we can immediately log this message's sad fate. The data
4556 file has already been unlinked, and the header file was never written to disk.
4557 We must now indicate that nothing was received, to prevent a delivery from
4562 const uschar *detail =
4563 #ifdef HAVE_LOCAL_SCAN
4564 local_scan_data ? string_printing(local_scan_data) :
4566 string_sprintf("(%s discarded recipients)", blackholed_by);
4567 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4568 log_write(0, LOG_MAIN, "Completed");
4572 /* Reset headers so that logging of rejects for a subsequent message doesn't
4573 include them. It is also important to set header_last = NULL before exiting
4574 from this function, as this prevents certain rewrites that might happen during
4575 subsequent verifying (of another incoming message) from trying to add headers
4576 when they shouldn't. */
4578 header_list = header_last = NULL;
4580 return yield; /* TRUE if more messages (SMTP only) */
4583 /* End of receive.c */