1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 */
7 /* See the file NOTICE for conditions of use and distribution. */
9 /* Code for receiving a message and setting up spool files. */
14 #ifdef EXPERIMENTAL_DCC
22 /*************************************************
23 * Local static variables *
24 *************************************************/
26 static int data_fd = -1;
27 static uschar *spool_name = US"";
29 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
31 #ifdef HAVE_LOCAL_SCAN
32 jmp_buf local_scan_env; /* error-handling context for local_scan */
33 unsigned had_local_scan_crash;
34 unsigned had_local_scan_timeout;
38 /*************************************************
39 * Non-SMTP character reading functions *
40 *************************************************/
42 /* These are the default functions that are set up in the variables such as
43 receive_getc initially. They just call the standard functions, passing stdin as
44 the file. (When SMTP input is occurring, different functions are used by
45 changing the pointer variables.) */
48 stdin_getc(unsigned lim)
54 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
55 log_write(L_lost_incoming_connection,
56 LOG_MAIN, "timed out while reading local message");
57 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
61 if (filter_test == FTEST_NONE)
63 fprintf(stderr, "\nexim: %s received - message abandoned\n",
64 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
65 log_write(0, LOG_MAIN, "%s received while reading local message",
66 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
68 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
76 return ungetc(c, stdin);
94 /*************************************************
95 * Check that a set sender is allowed *
96 *************************************************/
98 /* This function is called when a local caller sets an explicit sender address.
99 It checks whether this is permitted, which it is for trusted callers.
100 Otherwise, it must match the pattern(s) in untrusted_set_sender.
102 Arguments: the proposed sender address
103 Returns: TRUE for a trusted caller
104 TRUE if the address has been set, untrusted_set_sender has been
105 set, and the address matches something in the list
110 receive_check_set_sender(uschar *newsender)
113 if (f.trusted_caller) return TRUE;
114 if (!newsender || !untrusted_set_sender) return FALSE;
115 qnewsender = Ustrchr(newsender, '@')
116 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
117 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
123 /*************************************************
124 * Read space info for a partition *
125 *************************************************/
127 /* This function is called by receive_check_fs() below, and also by string
128 expansion for variables such as $spool_space. The field names for the statvfs
129 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
130 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
131 have inodes, and they return -1 for the number available.
133 Later: It turns out that some file systems that do not have the concept of
134 inodes return 0 rather than -1. Such systems should also return 0 for the total
135 number of inodes, so we require that to be greater than zero before returning
139 isspool TRUE for spool partition, FALSE for log partition
140 inodeptr address of int to receive inode count; -1 if there isn't one
142 Returns: available on-root space, in kilobytes
143 -1 for log partition if there isn't one
145 All values are -1 if the STATFS functions are not available.
149 receive_statvfs(BOOL isspool, int *inodeptr)
152 struct STATVFS statbuf;
158 /* The spool directory must always exist. */
162 path = spool_directory;
166 /* Need to cut down the log file path to the directory, and to ignore any
167 appearance of "syslog" in it. */
171 int sep = ':'; /* Not variable - outside scripts use */
172 const uschar *p = log_file_path;
175 /* An empty log_file_path means "use the default". This is the same as an
176 empty item in a list. */
178 if (*p == 0) p = US":";
179 /* should never be a tainted list */
180 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
181 if (Ustrcmp(path, "syslog") != 0)
184 if (path == NULL) /* No log files */
190 /* An empty string means use the default, which is in the spool directory.
191 But don't just use the spool directory, as it is possible that the log
192 subdirectory has been symbolically linked elsewhere. */
196 sprintf(CS buffer, CS"%s/log", CS spool_directory);
202 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
206 /* We now have the path; do the business */
208 memset(&statbuf, 0, sizeof(statbuf));
210 if (STATVFS(CS path, &statbuf) != 0)
211 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
212 { /* Can happen on first run after installation */
218 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
219 "%s directory %s: %s", name, path, strerror(errno));
220 smtp_closedown(US"spool or log directory problem");
221 exim_exit(EXIT_FAILURE);
224 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
226 /* Disks are getting huge. Take care with computing the size in kilobytes. */
228 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
231 /* Unable to find partition sizes in this environment. */
241 /*************************************************
242 * Check space on spool and log partitions *
243 *************************************************/
245 /* This function is called before accepting a message; if any thresholds are
246 set, it checks them. If a message_size is supplied, it checks that there is
247 enough space for that size plus the threshold - i.e. that the message won't
248 reduce the space to the threshold. Not all OS have statvfs(); for those that
249 don't, this function always returns TRUE. For some OS the old function and
250 struct name statfs is used; that is handled by a macro, defined in exim.h.
253 msg_size the (estimated) size of an incoming message
255 Returns: FALSE if there isn't enough space, or if the information cannot
257 TRUE if no check was done or there is enough space
261 receive_check_fs(int msg_size)
263 int_eximarith_t space;
266 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
268 space = receive_statvfs(TRUE, &inodes);
271 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
272 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
273 space, inodes, check_spool_space, check_spool_inodes, msg_size);
275 if ( space >= 0 && space + msg_size / 1024 < check_spool_space
276 || inodes >= 0 && inodes < check_spool_inodes)
278 log_write(0, LOG_MAIN, "spool directory space check failed: space="
279 PR_EXIM_ARITH " inodes=%d", space, inodes);
284 if (check_log_space > 0 || check_log_inodes > 0)
286 space = receive_statvfs(FALSE, &inodes);
289 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
290 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
291 space, inodes, check_log_space, check_log_inodes);
293 if ( space >= 0 && space < check_log_space
294 || inodes >= 0 && inodes < check_log_inodes)
296 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
297 " inodes=%d", space, inodes);
307 /*************************************************
308 * Bomb out while reading a message *
309 *************************************************/
311 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
312 received, or if there is a timeout. A rarer case might be if the log files are
313 screwed up and Exim can't open them to record a message's arrival. Handling
314 that case is done by setting a flag to cause the log functions to call this
315 function if there is an ultimate disaster. That is why it is globally
319 reason text reason to pass to the not-quit ACL
320 msg default SMTP response to give if in an SMTP session
325 receive_bomb_out(uschar *reason, uschar *msg)
327 static BOOL already_bombing_out;
328 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
329 timeouts, if someone has something slow in their quit ACL. Since the only
330 things we should be doing are to close down cleanly ASAP, on the second
331 pass we also close down stuff that might be opened again, before bypassing
332 the ACL call and exiting. */
334 /* If spool_name is set, it contains the name of the data file that is being
335 written. Unlink it before closing so that it cannot be picked up by a delivery
336 process. Ensure that any header file is also removed. */
338 if (spool_name[0] != '\0')
341 spool_name[Ustrlen(spool_name) - 1] = 'H';
343 spool_name[0] = '\0';
346 /* Now close the file if it is open, either as a fd or a stream. */
350 (void)fclose(spool_data_file);
351 spool_data_file = NULL;
353 else if (data_fd >= 0)
355 (void)close(data_fd);
359 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
360 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
363 if (!already_bombing_out)
365 already_bombing_out = TRUE;
368 if (smtp_batched_input)
369 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
370 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
371 smtp_active_hostname, msg);
375 /* Exit from the program (non-BSMTP cases) */
377 exim_exit(EXIT_FAILURE);
381 /*************************************************
382 * Data read timeout *
383 *************************************************/
385 /* Handler function for timeouts that occur while reading the data that
388 Argument: the signal number
393 data_timeout_handler(int sig)
395 had_data_timeout = sig;
400 #ifdef HAVE_LOCAL_SCAN
401 /*************************************************
402 * local_scan() timeout *
403 *************************************************/
405 /* Handler function for timeouts that occur while running a local_scan()
406 function. Posix recommends against calling longjmp() from a signal-handler,
407 but the GCC manual says you can so we will, and trust that it's better than
408 calling probably non-signal-safe funxtions during logging from within the
409 handler, even with other compilers.
411 See also https://cwe.mitre.org/data/definitions/745.html which also lists
414 This is all because we have no control over what might be written for a
415 local-scan function, so cannot sprinkle had-signal checks after each
416 call-site. At least with the default "do-nothing" function we won't
419 Argument: the signal number
424 local_scan_timeout_handler(int sig)
426 had_local_scan_timeout = sig;
427 siglongjmp(local_scan_env, 1);
432 /*************************************************
433 * local_scan() crashed *
434 *************************************************/
436 /* Handler function for signals that occur while running a local_scan()
439 Argument: the signal number
444 local_scan_crash_handler(int sig)
446 had_local_scan_crash = sig;
447 siglongjmp(local_scan_env, 1);
450 #endif /*HAVE_LOCAL_SCAN*/
453 /*************************************************
454 * SIGTERM or SIGINT received *
455 *************************************************/
457 /* Handler for SIGTERM or SIGINT signals that occur while reading the
458 data that comprises a message.
460 Argument: the signal number
465 data_sigterm_sigint_handler(int sig)
467 had_data_sigint = sig;
472 /*************************************************
473 * Add new recipient to list *
474 *************************************************/
476 /* This function builds a list of recipient addresses in argc/argv
480 recipient the next address to add to recipients_list
481 pno parent number for fixed aliases; -1 otherwise
487 receive_add_recipient(uschar *recipient, int pno)
489 if (recipients_count >= recipients_list_max)
491 recipient_item *oldlist = recipients_list;
492 int oldmax = recipients_list_max;
493 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
494 recipients_list = store_get(recipients_list_max * sizeof(recipient_item), FALSE);
496 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
499 recipients_list[recipients_count].address = recipient;
500 recipients_list[recipients_count].pno = pno;
501 #ifdef EXPERIMENTAL_BRIGHTMAIL
502 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
503 /* reset optin string pointer for next recipient */
504 bmi_current_optin = NULL;
506 recipients_list[recipients_count].orcpt = NULL;
507 recipients_list[recipients_count].dsn_flags = 0;
508 recipients_list[recipients_count++].errors_to = NULL;
514 /*************************************************
515 * Send user response message *
516 *************************************************/
518 /* This function is passed a default response code and a user message. It calls
519 smtp_message_code() to check and possibly modify the response code, and then
520 calls smtp_respond() to transmit the response. I put this into a function
521 just to avoid a lot of repetition.
524 code the response code
525 user_msg the user message
532 smtp_user_msg(uschar *code, uschar *user_msg)
535 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
536 smtp_respond(code, len, TRUE, user_msg);
544 /*************************************************
545 * Remove a recipient from the list *
546 *************************************************/
548 /* This function is provided for local_scan() to use.
551 recipient address to remove
553 Returns: TRUE if it did remove something; FALSE otherwise
557 receive_remove_recipient(uschar *recipient)
559 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
561 for (int count = 0; count < recipients_count; count++)
562 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
564 if ((--recipients_count - count) > 0)
565 memmove(recipients_list + count, recipients_list + count + 1,
566 (recipients_count - count)*sizeof(recipient_item));
576 /* Pause for a while waiting for input. If none received in that time,
577 close the logfile, if we had one open; then if we wait for a long-running
578 datasource (months, in one use-case) log rotation will not leave us holding
584 if (!receive_timeout)
587 timesince(&t, &received_time);
588 if (t.tv_sec > 30*60)
593 FD_ZERO(&r); FD_SET(0, &r);
594 t.tv_sec = 30*60 - t.tv_sec; t.tv_usec = 0;
595 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
600 /*************************************************
601 * Read data portion of a non-SMTP message *
602 *************************************************/
604 /* This function is called to read the remainder of a message (following the
605 header) when the input is not from SMTP - we are receiving a local message on
606 a standard input stream. The message is always terminated by EOF, and is also
607 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
608 two cases for maximum efficiency.
610 Ensure that the body ends with a newline. This will naturally be the case when
611 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
612 as "sequences of lines" - this of course strictly applies only to SMTP, but
613 deliveries into BSD-type mailbox files also require it. Exim used to have a
614 flag for doing this at delivery time, but as it was always set for all
615 transports, I decided to simplify things by putting the check here instead.
617 There is at least one MUA (dtmail) that sends CRLF via this interface, and
618 other programs are known to do this as well. Exim used to have a option for
619 dealing with this: in July 2003, after much discussion, the code has been
620 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
622 However, for the case when a dot on a line by itself terminates a message, the
623 only recognized terminating sequences before and after the dot are LF and CRLF.
624 Otherwise, having read EOL . CR, you don't know whether to read another
627 Internally, in messages stored in Exim's spool files, LF is used as the line
628 terminator. Under the new regime, bare CRs will no longer appear in these
632 fout a FILE to which to write the message
634 Returns: One of the END_xxx values indicating why it stopped reading
638 read_message_data(FILE *fout)
642 register int linelength = 0;
644 /* Handle the case when only EOF terminates the message */
650 /*XXX we do a gettimeofday before checking for every received char,
651 which is hardly clever. The function-indirection doesn't help, but
652 an additional function to check for nonempty read buffer would help.
653 See stdin_getc() / smtp_getc() / tls_getc() / bdat_getc(). */
656 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
659 if (ch == 0) body_zerocount++;
660 if (last_ch == '\r' && ch != '\n')
662 if (linelength > max_received_linelength)
663 max_received_linelength = linelength;
665 if (fputc('\n', fout) == EOF) return END_WERROR;
669 if (ch == '\r') continue;
671 if (fputc(ch, fout) == EOF) return END_WERROR;
674 if (linelength > max_received_linelength)
675 max_received_linelength = linelength;
680 if (++message_size > thismessage_size_limit) return END_SIZE;
685 if (linelength > max_received_linelength)
686 max_received_linelength = linelength;
687 if (fputc('\n', fout) == EOF) return END_WERROR;
695 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
699 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
701 if (ch == 0) body_zerocount++;
704 case 0: /* Normal state (previous char written) */
708 if (linelength > max_received_linelength)
709 max_received_linelength = linelength;
714 { ch_state = 2; continue; }
717 case 1: /* After written "\n" */
718 if (ch == '.') { ch_state = 3; continue; }
719 if (ch == '\r') { ch_state = 2; continue; }
720 if (ch == '\n') { body_linecount++; linelength = -1; }
725 body_linecount++; /* After unwritten "\r" */
726 if (linelength > max_received_linelength)
727 max_received_linelength = linelength;
735 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
736 if (ch == '\r') continue;
742 case 3: /* After "\n." (\n written, dot not) */
743 if (ch == '\n') return END_DOT;
744 if (ch == '\r') { ch_state = 4; continue; }
747 if (fputc('.', fout) == EOF) return END_WERROR;
751 case 4: /* After "\n.\r" (\n written, rest not) */
752 if (ch == '\n') return END_DOT;
755 if (fputs(".\n", fout) == EOF) return END_WERROR;
756 if (ch == '\r') { ch_state = 2; continue; }
762 if (fputc(ch, fout) == EOF) return END_WERROR;
763 if (++message_size > thismessage_size_limit) return END_SIZE;
766 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
767 the message ends with a newline, and we must also write any characters that
768 were saved up while testing for an ending dot. */
772 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
773 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
774 message_size += Ustrlen(ends[ch_state]);
784 /*************************************************
785 * Read data portion of an SMTP message *
786 *************************************************/
788 /* This function is called to read the remainder of an SMTP message (after the
789 headers), or to skip over it when an error has occurred. In this case, the
790 output file is passed as NULL.
792 If any line begins with a dot, that character is skipped. The input should only
793 be successfully terminated by CR LF . CR LF unless it is local (non-network)
794 SMTP, in which case the CRs are optional, but...
796 FUDGE: It seems that sites on the net send out messages with just LF
797 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
798 we make the CRs optional in all cases.
800 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
801 well, so that there are no CRs in spooled messages. However, the message
802 terminating dot is not recognized between two bare CRs.
805 fout a FILE to which to write the message; NULL if skipping
807 Returns: One of the END_xxx values indicating why it stopped reading
811 read_message_data_smtp(FILE *fout)
817 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
819 if (ch == 0) body_zerocount++;
822 case 0: /* After LF or CRLF */
826 continue; /* Don't ever write . after LF */
830 /* Else fall through to handle as normal uschar. */
832 case 1: /* Normal state */
837 if (linelength > max_received_linelength)
838 max_received_linelength = linelength;
848 case 2: /* After (unwritten) CR */
850 if (linelength > max_received_linelength)
851 max_received_linelength = linelength;
860 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
861 cutthrough_data_put_nl();
862 if (ch != '\r') ch_state = 1; else continue;
866 case 3: /* After [CR] LF . */
874 /* The dot was removed at state 3. For a doubled dot, here, reinstate
875 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
876 and to file below. */
880 cutthrough_data_puts(&c, 1);
885 case 4: /* After [CR] LF . CR */
886 if (ch == '\n') return END_DOT;
889 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
890 cutthrough_data_put_nl();
900 /* Add the character to the spool file, unless skipping; then loop for the
907 if (fputc(ch, fout) == EOF) return END_WERROR;
908 if (message_size > thismessage_size_limit) return END_SIZE;
911 cutthrough_data_put_nl();
915 cutthrough_data_puts(&c, 1);
919 /* Fall through here if EOF encountered. This indicates some kind of error,
920 since a correct message is terminated by [CR] LF . [CR] LF. */
928 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
929 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
930 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
931 body_linecount accounting for proper re-expansion for the wire, so use
932 a cut-down version of the state-machine above; we don't need to do leading-dot
933 detection and unstuffing.
936 fout a FILE to which to write the message; NULL if skipping;
937 must be open for both writing and reading.
939 Returns: One of the END_xxx values indicating why it stopped reading
943 read_message_bdat_smtp(FILE *fout)
945 int linelength = 0, ch;
946 enum CH_STATE ch_state = LF_SEEN;
951 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
953 case EOF: return END_EOF;
954 case ERR: return END_PROTOCOL;
956 /* Nothing to get from the sender anymore. We check the last
957 character written to the spool.
959 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
960 If we would be strict, we would refuse such broken messages.
961 But we are liberal, so we fix it. It would be easy just to append
962 the "\n" to the spool.
964 But there are some more things (line counting, message size calculation and such),
965 that would need to be duplicated here. So we simply do some ungetc
970 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
971 if (fgetc(fout) == '\n') return END_DOT;
974 if (linelength == -1) /* \r already seen (see below) */
976 DEBUG(D_receive) debug_printf("Add missing LF\n");
980 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
981 bdat_ungetc('\r'); /* not even \r was seen */
985 case '\0': body_zerocount++; break;
989 case LF_SEEN: /* After LF or CRLF */
991 /* fall through to handle as normal uschar. */
993 case MID_LINE: /* Mid-line state */
998 if (linelength > max_received_linelength)
999 max_received_linelength = linelength;
1002 else if (ch == '\r')
1005 if (fix_nl) bdat_ungetc('\n');
1006 continue; /* don't write CR */
1010 case CR_SEEN: /* After (unwritten) CR */
1012 if (linelength > max_received_linelength)
1013 max_received_linelength = linelength;
1020 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1021 cutthrough_data_put_nl();
1022 if (ch == '\r') continue; /* don't write CR */
1023 ch_state = MID_LINE;
1028 /* Add the character to the spool file, unless skipping */
1034 if (fputc(ch, fout) == EOF) return END_WERROR;
1035 if (message_size > thismessage_size_limit) return END_SIZE;
1038 cutthrough_data_put_nl();
1042 cutthrough_data_puts(&c, 1);
1049 read_message_bdat_smtp_wire(FILE *fout)
1053 /* Remember that this message uses wireformat. */
1055 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1056 fout ? "writing spoolfile in wire format" : "flushing input");
1057 f.spool_file_wireformat = TRUE;
1061 if (chunking_data_left > 0)
1063 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1064 uschar * buf = bdat_getbuf(&len);
1066 if (!buf) return END_EOF;
1067 message_size += len;
1068 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1070 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1072 case EOF: return END_EOF;
1073 case EOD: return END_DOT;
1074 case ERR: return END_PROTOCOL;
1080 max_received_linelength
1084 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1087 if (message_size > thismessage_size_limit) return END_SIZE;
1095 /*************************************************
1096 * Swallow SMTP message *
1097 *************************************************/
1099 /* This function is called when there has been some kind of error while reading
1100 an SMTP message, and the remaining data may need to be swallowed. It is global
1101 because it is called from smtp_closedown() to shut down an incoming call
1104 Argument: a FILE from which to read the message
1109 receive_swallow_smtp(void)
1111 if (message_ended >= END_NOTENDED)
1112 message_ended = chunking_state <= CHUNKING_OFFERED
1113 ? read_message_data_smtp(NULL)
1114 : read_message_bdat_smtp_wire(NULL);
1119 /*************************************************
1120 * Handle lost SMTP connection *
1121 *************************************************/
1123 /* This function logs connection loss incidents and generates an appropriate
1126 Argument: additional data for the message
1127 Returns: the SMTP response
1131 handle_lost_connection(uschar *s)
1133 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1134 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1135 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1136 return US"421 Lost incoming connection";
1142 /*************************************************
1143 * Handle a non-smtp reception error *
1144 *************************************************/
1146 /* This function is called for various errors during the reception of non-SMTP
1147 messages. It either sends a message to the sender of the problem message, or it
1148 writes to the standard error stream.
1151 errcode code for moan_to_sender(), identifying the error
1152 text1 first message text, passed to moan_to_sender()
1153 text2 second message text, used only for stderrr
1154 error_rc code to pass to exim_exit if no problem
1155 f FILE containing body of message (may be stdin)
1156 hptr pointer to instore headers or NULL
1158 Returns: calls exim_exit(), which does not return
1162 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1163 FILE *f, header_line *hptr)
1165 if (error_handling == ERRORS_SENDER)
1169 eblock.text1 = text1;
1170 eblock.text2 = US"";
1171 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1172 error_rc = EXIT_FAILURE;
1175 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1177 exim_exit(error_rc);
1182 /*************************************************
1183 * Add header lines set up by ACL *
1184 *************************************************/
1186 /* This function is called to add the header lines that were set up by
1187 statements in an ACL to the list of headers in memory. It is done in two stages
1188 like this, because when the ACL for RCPT is running, the other headers have not
1189 yet been received. This function is called twice; once just before running the
1190 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1191 are visible to the DATA ACL.
1193 Originally these header lines were added at the end. Now there is support for
1194 three different places: top, bottom, and after the Received: header(s). There
1195 will always be at least one Received: header, even if it is marked deleted, and
1196 even if something else has been put in front of it.
1199 acl_name text to identify which ACL
1205 add_acl_headers(int where, uschar *acl_name)
1207 header_line *last_received = NULL;
1211 case ACL_WHERE_DKIM:
1212 case ACL_WHERE_MIME:
1213 case ACL_WHERE_DATA:
1214 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1215 && (acl_removed_headers || acl_added_headers))
1217 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1218 " will not take effect on cutthrough deliveries");
1223 if (acl_removed_headers)
1225 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1227 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1229 const uschar * list = acl_removed_headers;
1230 int sep = ':'; /* This is specified as a colon-separated list */
1233 while ((s = string_nextinlist(&list, &sep, NULL, 0)))
1234 if (header_testname(h, s, Ustrlen(s), FALSE))
1236 h->type = htype_old;
1237 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1240 acl_removed_headers = NULL;
1241 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1244 if (!acl_added_headers) return;
1245 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1247 for (header_line * h = acl_added_headers, * next; h; h = next)
1254 h->next = header_list;
1256 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1262 last_received = header_list;
1263 while (!header_testname(last_received, US"Received", 8, FALSE))
1264 last_received = last_received->next;
1265 while (last_received->next &&
1266 header_testname(last_received->next, US"Received", 8, FALSE))
1267 last_received = last_received->next;
1269 h->next = last_received->next;
1270 last_received->next = h;
1271 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1275 /* add header before any header which is NOT Received: or Resent- */
1276 last_received = header_list;
1277 while ( last_received->next &&
1278 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1279 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1280 last_received = last_received->next;
1281 /* last_received now points to the last Received: or Resent-* header
1282 in an uninterrupted chain of those header types (seen from the beginning
1283 of all headers. Our current header must follow it. */
1284 h->next = last_received->next;
1285 last_received->next = h;
1286 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1291 header_last->next = h;
1292 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1296 if (!h->next) header_last = h;
1298 /* Check for one of the known header types (From:, To:, etc.) though in
1299 practice most added headers are going to be "other". Lower case
1300 identification letters are never stored with the header; they are used
1301 for existence tests when messages are received. So discard any lower case
1304 h->type = header_checkname(h, FALSE);
1305 if (h->type >= 'a') h->type = htype_other;
1307 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1310 acl_added_headers = NULL;
1311 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1316 /*************************************************
1317 * Add host information for log line *
1318 *************************************************/
1320 /* Called for acceptance and rejecting log lines. This adds information about
1321 the calling host to a string that is being built dynamically.
1324 s the dynamic string
1326 Returns: the extended string
1330 add_host_info_for_log(gstring * g)
1332 if (sender_fullhost)
1334 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1335 g = string_catn(g, US" DS", 3);
1336 g = string_append(g, 2, US" H=", sender_fullhost);
1337 if (LOGGING(incoming_interface) && interface_address)
1338 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1340 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1342 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1343 f.tcp_in_fastopen_logged = TRUE;
1346 g = string_append(g, 2, US" U=", sender_ident);
1347 if (received_protocol)
1348 g = string_append(g, 2, US" P=", received_protocol);
1349 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1351 g = string_catn(g, US" L", 2);
1352 #ifndef DISABLE_PIPE_CONNECT
1353 if (f.smtp_in_early_pipe_used)
1354 g = string_catn(g, US"*", 1);
1355 else if (f.smtp_in_early_pipe_advertised)
1356 g = string_catn(g, US".", 1);
1358 if (!f.smtp_in_pipelining_used)
1359 g = string_catn(g, US"-", 1);
1366 #ifdef WITH_CONTENT_SCAN
1368 /*************************************************
1369 * Run the MIME ACL on a message *
1370 *************************************************/
1372 /* This code is in a subroutine so that it can be used for both SMTP
1373 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1376 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1377 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1378 smtp_reply_ptr Where SMTP reply is being built
1379 blackholed_by_ptr Where "blackholed by" message is being built
1381 Returns: TRUE to carry on; FALSE to abandon the message
1385 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1386 uschar **blackholed_by_ptr)
1389 uschar * rfc822_file_path = NULL;
1390 unsigned long mbox_size;
1391 uschar *user_msg, *log_msg;
1392 int mime_part_count_buffer = -1;
1393 uschar * mbox_filename;
1396 /* check if it is a MIME message */
1398 for (header_line * my_headerlist = header_list; my_headerlist;
1399 my_headerlist = my_headerlist->next)
1400 if ( my_headerlist->type != '*' /* skip deleted headers */
1401 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1404 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1408 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1413 /* make sure the eml mbox file is spooled up */
1414 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1415 { /* error while spooling */
1416 log_write(0, LOG_MAIN|LOG_PANIC,
1417 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1418 Uunlink(spool_name);
1420 #ifdef EXPERIMENTAL_DCC
1423 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1424 message_id[0] = 0; /* Indicate no message accepted */
1425 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1426 return FALSE; /* Indicate skip to end of receive function */
1432 mime_part_count = -1;
1433 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1434 (void)fclose(mbox_file);
1436 if (rfc822_file_path)
1438 mime_part_count = mime_part_count_buffer;
1440 if (unlink(CS rfc822_file_path) == -1)
1442 log_write(0, LOG_PANIC,
1443 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1446 rfc822_file_path = NULL;
1449 /* check if we must check any message/rfc822 attachments */
1452 uschar * scandir = string_copyn(mbox_filename,
1453 Ustrrchr(mbox_filename, '/') - mbox_filename);
1454 struct dirent * entry;
1457 for (tempdir = exim_opendir(scandir); entry = readdir(tempdir); )
1458 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1460 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1462 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1468 if (rfc822_file_path)
1470 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1472 /* set RFC822 expansion variable */
1474 mime_part_count_buffer = mime_part_count;
1475 goto MIME_ACL_CHECK;
1477 log_write(0, LOG_PANIC,
1478 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1479 unlink(CS rfc822_file_path);
1484 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1487 recipients_count = 0;
1488 *blackholed_by_ptr = US"MIME ACL";
1489 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1493 Uunlink(spool_name);
1494 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1496 #ifdef EXPERIMENTAL_DCC
1501 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1502 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1503 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1505 message_id[0] = 0; /* Indicate no message accepted */
1506 return FALSE; /* Cause skip to end of receive function */
1512 #endif /* WITH_CONTENT_SCAN */
1517 received_header_gen(void)
1521 header_line *received_header= header_list;
1523 timestamp = expand_string(US"${tod_full}");
1524 if (recipients_count == 1) received_for = recipients_list[0].address;
1525 received = expand_string(received_header_text);
1526 received_for = NULL;
1530 if(spool_name[0] != 0)
1531 Uunlink(spool_name); /* Lose the data file */
1532 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1533 "(received_header_text) failed: %s", string_printing(received_header_text),
1534 expand_string_message);
1537 /* The first element on the header chain is reserved for the Received header,
1538 so all we have to do is fill in the text pointer, and set the type. However, if
1539 the result of the expansion is an empty string, we leave the header marked as
1540 "old" so as to refrain from adding a Received header. */
1542 if (received[0] == 0)
1544 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1545 received_header->type = htype_old;
1549 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1550 received_header->type = htype_received;
1553 received_header->slen = Ustrlen(received_header->text);
1555 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1556 received_header->type, received_header->text);
1561 /*************************************************
1563 *************************************************/
1565 /* Receive a message on the given input, and put it into a pair of spool files.
1566 Either a non-null list of recipients, or the extract flag will be true, or
1567 both. The flag sender_local is true for locally generated messages. The flag
1568 submission_mode is true if an ACL has obeyed "control = submission". The flag
1569 suppress_local_fixups is true if an ACL has obeyed "control =
1570 suppress_local_fixups" or -G was passed on the command-line.
1571 The flag smtp_input is true if the message is to be
1572 handled using SMTP conventions about termination and lines starting with dots.
1573 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1575 If a message was successfully read, message_id[0] will be non-zero.
1577 The general actions of this function are:
1579 . Read the headers of the message (if any) into a chain of store
1582 . If there is a "sender:" header and the message is locally originated,
1583 throw it away, unless the caller is trusted, or unless
1584 active_local_sender_retain is set - which can only happen if
1585 active_local_from_check is false.
1587 . If recipients are to be extracted from the message, build the
1588 recipients list from the headers, removing any that were on the
1589 original recipients list (unless extract_addresses_remove_arguments is
1590 false), and at the same time, remove any bcc header that may be present.
1592 . Get the spool file for the data, sort out its unique name, open
1593 and lock it (but don't give it the name yet).
1595 . Generate a "Message-Id" header if the message doesn't have one, for
1596 locally-originated messages.
1598 . Generate a "Received" header.
1600 . Ensure the recipients list is fully qualified and rewritten if necessary.
1602 . If there are any rewriting rules, apply them to the sender address
1603 and also to the headers.
1605 . If there is no from: header, generate one, for locally-generated messages
1606 and messages in "submission mode" only.
1608 . If the sender is local, check that from: is correct, and if not, generate
1609 a Sender: header, unless message comes from a trusted caller, or this
1610 feature is disabled by active_local_from_check being false.
1612 . If there is no "date" header, generate one, for locally-originated
1613 or submission mode messages only.
1615 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1616 dot_ends mode, to the data file. Leave it open, to hold the lock.
1618 . Write the envelope and the headers to a new file.
1620 . Set the name for the header file; close it.
1622 . Set the name for the data file; close it.
1624 Because this function can potentially be called many times in a single
1625 SMTP connection, all store should be got by store_get(), so that it will be
1626 automatically retrieved after the message is accepted.
1628 FUDGE: It seems that sites on the net send out messages with just LF
1629 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1630 we make the CRs optional in all cases.
1632 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1633 new regime is now in place in which bare CRs in header lines are turned into LF
1634 followed by a space, so as not to terminate the header line.
1636 February 2004: A bare LF in a header line in a message whose first line was
1637 terminated by CRLF is treated in the same way as a bare CR.
1640 extract_recip TRUE if recipients are to be extracted from the message's
1643 Returns: TRUE there are more messages to be read (SMTP input)
1644 FALSE there are no more messages to be read (non-SMTP input
1645 or SMTP connection collapsed, or other failure)
1647 When reading a message for filter testing, the returned value indicates
1648 whether the headers (which is all that is read) were terminated by '.' or
1652 receive_msg(BOOL extract_recip)
1656 int process_info_len = Ustrlen(process_info);
1657 int error_rc = error_handling == ERRORS_SENDER
1658 ? errors_sender_rc : EXIT_FAILURE;
1659 int header_size = 256;
1660 int start, end, domain;
1661 int id_resolution = 0;
1663 int prevlines_length = 0;
1667 BOOL contains_resent_headers = FALSE;
1668 BOOL extracted_ignored = FALSE;
1669 BOOL first_line_ended_crlf = TRUE_UNSET;
1670 BOOL smtp_yield = TRUE;
1673 BOOL resents_exist = FALSE;
1674 uschar *resent_prefix = US"";
1675 uschar *blackholed_by = NULL;
1676 uschar *blackhole_log_msg = US"";
1677 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1680 error_block *bad_addresses = NULL;
1682 uschar *frozen_by = NULL;
1683 uschar *queued_by = NULL;
1686 rmark rcvd_log_reset_point;
1688 struct stat statbuf;
1690 /* Final message to give to SMTP caller, and messages from ACLs */
1692 uschar *smtp_reply = NULL;
1693 uschar *user_msg, *log_msg;
1695 /* Working header pointers */
1700 /* Flags for noting the existence of certain headers (only one left) */
1702 BOOL date_header_exists = FALSE;
1704 /* Pointers to receive the addresses of headers whose contents we need. */
1706 header_line *from_header = NULL;
1707 header_line *subject_header = NULL;
1708 header_line *msgid_header = NULL;
1709 header_line *received_header;
1710 BOOL msgid_header_newly_created = FALSE;
1712 /* Variables for use when building the Received: header. */
1718 /* Release any open files that might have been cached while preparing to
1719 accept the message - e.g. by verifying addresses - because reading a message
1720 might take a fair bit of real time. */
1724 /* Extracting the recipient list from an input file is incompatible with
1725 cutthrough delivery with the no-spool option. It shouldn't be possible
1726 to set up the combination, but just in case kill any ongoing connection. */
1727 if (extract_recip || !smtp_input)
1728 cancel_cutthrough_connection(TRUE, US"not smtp input");
1730 /* Initialize the chain of headers by setting up a place-holder for Received:
1731 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1732 pointing to the end of the chain to make adding headers simple. */
1734 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1735 header_list->next = NULL;
1736 header_list->type = htype_old;
1737 header_list->text = NULL;
1738 header_list->slen = 0;
1740 /* Control block for the next header to be read. */
1742 reset_point = store_mark();
1743 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1744 next->text = store_get(header_size, TRUE); /* tainted */
1746 /* Initialize message id to be null (indicating no message read), and the
1747 header names list to be the normal list. Indicate there is no data file open
1748 yet, initialize the size and warning count, and deal with no size limit. */
1751 spool_data_file = NULL;
1756 received_count = 1; /* For the one we will add */
1758 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1760 /* While reading the message, the following counts are computed. */
1762 message_linecount = body_linecount = body_zerocount =
1763 max_received_linelength = 0;
1765 #ifdef WITH_CONTENT_SCAN
1766 /* reset non-per-part mime variables */
1767 mime_is_coverletter = 0;
1769 mime_part_count = -1;
1772 #ifndef DISABLE_DKIM
1773 /* Call into DKIM to set up the context. In CHUNKING mode
1774 we clear the dot-stuffing flag */
1775 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1776 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1779 #ifdef SUPPORT_DMARC
1780 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1783 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1784 ids, and fractions of a second are required. See the comments that precede the
1785 message id creation below. */
1787 exim_gettime(&message_id_tv);
1789 /* For other uses of the received time we can operate with granularity of one
1790 second, and for that we use the global variable received_time. This is for
1791 things like ultimate message timeouts. */
1793 received_time = message_id_tv;
1795 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1796 happen in the smtp_getc() function when it refills its buffer. */
1798 had_data_timeout = 0;
1800 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1802 /* If not SMTP input, timeout happens only if configured, and we just set a
1803 single timeout for the whole message. */
1805 else if (receive_timeout > 0)
1807 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1808 ALARM(receive_timeout);
1811 /* SIGTERM and SIGINT are caught always. */
1813 had_data_sigint = 0;
1814 signal(SIGTERM, data_sigterm_sigint_handler);
1815 signal(SIGINT, data_sigterm_sigint_handler);
1817 /* Header lines in messages are not supposed to be very long, though when
1818 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1819 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1820 storing the header, and extend this as necessary using string_cat().
1822 To cope with total lunacies, impose an upper limit on the length of the header
1823 section of the message, as otherwise the store will fill up. We must also cope
1824 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1825 Folded header lines are joined into one string, leaving the '\n' characters
1826 inside them, so that writing them out reproduces the input.
1828 Loop for each character of each header; the next structure for chaining the
1829 header is set up already, with ptr the offset of the next character in
1834 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1836 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1837 SMTP must have a correct "." terminator. */
1839 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1841 smtp_reply = handle_lost_connection(US" (header)");
1843 goto TIDYUP; /* Skip to end of function */
1846 /* See if we are at the current header's size limit - there must be at least
1847 four bytes left. This allows for the new character plus a zero, plus two for
1848 extra insertions when we are playing games with dots and carriage returns. If
1849 we are at the limit, extend the text buffer. This could have been done
1850 automatically using string_cat() but because this is a tightish loop storing
1851 only one character at a time, we choose to do it inline. Normally
1852 store_extend() will be able to extend the block; only at the end of a big
1853 store block will a copy be needed. To handle the case of very long headers
1854 (and sometimes lunatic messages can have ones that are 100s of K long) we
1855 call store_release() for strings that have been copied - if the string is at
1856 the start of a block (and therefore the only thing in it, because we aren't
1857 doing any other gets), the block gets freed. We can only do this release if
1858 there were no allocations since the once that we want to free. */
1860 if (ptr >= header_size - 4)
1862 int oldsize = header_size;
1864 if (header_size >= INT_MAX/2)
1868 /* The data came from the message, so is tainted. */
1870 if (!store_extend(next->text, TRUE, oldsize, header_size))
1871 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1874 /* Cope with receiving a binary zero. There is dispute about whether
1875 these should be allowed in RFC 822 messages. The middle view is that they
1876 should not be allowed in headers, at least. Exim takes this attitude at
1877 the moment. We can't just stomp on them here, because we don't know that
1878 this line is a header yet. Set a flag to cause scanning later. */
1880 if (ch == 0) had_zero++;
1882 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1883 those from data files use just LF. Treat LF in local SMTP input as a
1884 terminator too. Treat EOF as a line terminator always. */
1886 if (ch == EOF) goto EOL;
1888 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1889 other MTAs accept this. We are therefore forced into this "liberalisation"
1890 too, so we accept LF as a line terminator whatever the source of the message.
1891 However, if the first line of the message ended with a CRLF, we treat a bare
1892 LF specially by inserting a white space after it to ensure that the header
1893 line is not terminated. */
1897 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1898 else if (first_line_ended_crlf) receive_ungetc(' ');
1902 /* This is not the end of the line. If this is SMTP input and this is
1903 the first character in the line and it is a "." character, ignore it.
1904 This implements the dot-doubling rule, though header lines starting with
1905 dots aren't exactly common. They are legal in RFC 822, though. If the
1906 following is CRLF or LF, this is the line that that terminates the
1907 entire message. We set message_ended to indicate this has happened (to
1908 prevent further reading), and break out of the loop, having freed the
1909 empty header, and set next = NULL to indicate no data line. */
1911 if (ptr == 0 && ch == '.' && f.dot_ends)
1913 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1916 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1920 ch = '\r'; /* Revert to CR */
1925 message_ended = END_DOT;
1926 reset_point = store_reset(reset_point);
1928 break; /* End character-reading loop */
1931 /* For non-SMTP input, the dot at the start of the line was really a data
1932 character. What is now in ch is the following character. We guaranteed
1933 enough space for this above. */
1937 next->text[ptr++] = '.';
1942 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1943 remember this case if this is the first line ending. */
1947 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1950 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1954 /* Otherwise, put back the character after CR, and turn the bare CR
1957 ch = (receive_ungetc)(ch);
1958 next->text[ptr++] = '\n';
1963 /* We have a data character for the header line. */
1965 next->text[ptr++] = ch; /* Add to buffer */
1966 message_size++; /* Total message size so far */
1968 /* Handle failure due to a humungously long header section. The >= allows
1969 for the terminating \n. Add what we have so far onto the headers list so
1970 that it gets reflected in any error message, and back up the just-read
1973 if (message_size >= header_maxsize)
1976 next->text[ptr] = 0;
1978 next->type = htype_other;
1980 header_last->next = next;
1983 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1984 "%s (more than %d characters): message abandoned",
1985 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1989 smtp_reply = US"552 Message header is ridiculously long";
1990 receive_swallow_smtp();
1991 goto TIDYUP; /* Skip to end of function */
1996 give_local_error(ERRMESS_VLONGHEADER,
1997 string_sprintf("message header longer than %d characters received: "
1998 "message not accepted", header_maxsize), US"", error_rc, stdin,
2000 /* Does not return */
2004 continue; /* With next input character */
2006 /* End of header line reached */
2010 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2012 receive_linecount++;
2013 message_linecount++;
2015 /* Keep track of maximum line length */
2017 if (ptr - prevlines_length > max_received_linelength)
2018 max_received_linelength = ptr - prevlines_length;
2019 prevlines_length = ptr + 1;
2021 /* Now put in the terminating newline. There is always space for
2022 at least two more characters. */
2024 next->text[ptr++] = '\n';
2027 /* A blank line signals the end of the headers; release the unwanted
2028 space and set next to NULL to indicate this. */
2032 reset_point = store_reset(reset_point);
2037 /* There is data in the line; see if the next input character is a
2038 whitespace character. If it is, we have a continuation of this header line.
2039 There is always space for at least one character at this point. */
2043 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2044 if (nextch == ' ' || nextch == '\t')
2046 next->text[ptr++] = nextch;
2047 if (++message_size >= header_maxsize)
2049 continue; /* Iterate the loop */
2051 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2052 else ch = EOF; /* Cause main loop to exit at end */
2055 /* We have got to the real line end. Terminate the string and release store
2056 beyond it. If it turns out to be a real header, internal binary zeros will
2057 be squashed later. */
2059 next->text[ptr] = 0;
2061 store_release_above(next->text + ptr + 1);
2063 /* Check the running total size against the overall message size limit. We
2064 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2065 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2066 headers - the code to read the body will then also hit the buffer. */
2068 if (message_size > thismessage_size_limit) break;
2070 /* A line that is not syntactically correct for a header also marks
2071 the end of the headers. In this case, we leave next containing the
2072 first data line. This might actually be several lines because of the
2073 continuation logic applied above, but that doesn't matter.
2075 It turns out that smail, and presumably sendmail, accept leading lines
2078 From ph10 Fri Jan 5 12:35 GMT 1996
2080 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2081 find any documentation of this, but for compatibility it had better be
2082 accepted. Exim restricts it to the case of non-smtp messages, and
2083 treats it as an alternative to the -f command line option. Thus it is
2084 ignored except for trusted users or filter testing. Otherwise it is taken
2085 as the sender address, unless -f was used (sendmail compatibility).
2087 It further turns out that some UUCPs generate the From_line in a different
2090 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2092 The regex for matching these things is now capable of recognizing both
2093 formats (including 2- and 4-digit years in the latter). In fact, the regex
2094 is now configurable, as is the expansion string to fish out the sender.
2096 Even further on it has been discovered that some broken clients send
2097 these lines in SMTP messages. There is now an option to ignore them from
2098 specified hosts or networks. Sigh. */
2100 if ( header_last == header_list
2102 || ( sender_host_address
2103 && verify_check_host(&ignore_fromline_hosts) == OK
2105 || (!sender_host_address && ignore_fromline_local)
2107 && regex_match_and_setup(regex_From, next->text, 0, -1)
2110 if (!f.sender_address_forced)
2112 uschar *uucp_sender = expand_string(uucp_from_sender);
2114 log_write(0, LOG_MAIN|LOG_PANIC,
2115 "expansion of \"%s\" failed after matching "
2116 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2119 int start, end, domain;
2121 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2122 &start, &end, &domain, TRUE);
2125 if (domain == 0 && newsender[0] != 0)
2126 newsender = rewrite_address_qualify(newsender, FALSE);
2128 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2130 sender_address = newsender;
2132 if (f.trusted_caller || filter_test != FTEST_NONE)
2134 authenticated_sender = NULL;
2135 originator_name = US"";
2136 f.sender_local = FALSE;
2139 if (filter_test != FTEST_NONE)
2140 printf("Sender taken from \"From \" line\n");
2147 /* Not a leading "From " line. Check to see if it is a valid header line.
2148 Header names may contain any non-control characters except space and colon,
2153 uschar *p = next->text;
2155 /* If not a valid header line, break from the header reading loop, leaving
2156 next != NULL, indicating that it holds the first line of the body. */
2158 if (isspace(*p)) break;
2159 while (mac_isgraph(*p) && *p != ':') p++;
2160 while (isspace(*p)) p++;
2163 body_zerocount = had_zero;
2167 /* We have a valid header line. If there were any binary zeroes in
2168 the line, stomp on them here. */
2171 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2174 /* It is perfectly legal to have an empty continuation line
2175 at the end of a header, but it is confusing to humans
2176 looking at such messages, since it looks like a blank line.
2177 Reduce confusion by removing redundant white space at the
2178 end. We know that there is at least one printing character
2179 (the ':' tested for above) so there is no danger of running
2182 p = next->text + ptr - 2;
2185 while (*p == ' ' || *p == '\t') p--;
2186 if (*p != '\n') break;
2187 ptr = (p--) - next->text + 1;
2188 message_size -= next->slen - ptr;
2189 next->text[ptr] = 0;
2193 /* Add the header to the chain */
2195 next->type = htype_other;
2197 header_last->next = next;
2200 /* Check the limit for individual line lengths. This comes after adding to
2201 the chain so that the failing line is reflected if a bounce is generated
2202 (for a local message). */
2204 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2206 log_write(0, LOG_MAIN, "overlong message header line received from "
2207 "%s (more than %d characters): message abandoned",
2208 f.sender_host_unknown ? sender_ident : sender_fullhost,
2209 header_line_maxsize);
2213 smtp_reply = US"552 A message header line is too long";
2214 receive_swallow_smtp();
2215 goto TIDYUP; /* Skip to end of function */
2219 give_local_error(ERRMESS_VLONGHDRLINE,
2220 string_sprintf("message header line longer than %d characters "
2221 "received: message not accepted", header_line_maxsize), US"",
2222 error_rc, stdin, header_list->next);
2223 /* Does not return */
2226 /* Note if any resent- fields exist. */
2228 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2230 resents_exist = TRUE;
2231 resent_prefix = US"Resent-";
2235 /* Reject CHUNKING messages that do not CRLF their first header line */
2237 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2239 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2240 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2242 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2243 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2244 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2247 goto TIDYUP; /* Skip to end of function */
2250 /* The line has been handled. If we have hit EOF, break out of the loop,
2251 indicating no pending data line. */
2253 if (ch == EOF) { next = NULL; break; }
2255 /* Set up for the next header */
2257 reset_point = store_mark();
2259 next = store_get(sizeof(header_line), FALSE);
2260 next->text = store_get(header_size, TRUE);
2263 prevlines_length = 0;
2264 } /* Continue, starting to read the next header */
2266 /* At this point, we have read all the headers into a data structure in main
2267 store. The first header is still the dummy placeholder for the Received: header
2268 we are going to generate a bit later on. If next != NULL, it contains the first
2269 data line - which terminated the headers before reaching a blank line (not the
2274 debug_printf(">>Headers received:\n");
2275 for (header_line * h = header_list->next; h; h = h->next)
2276 debug_printf("%s", h->text);
2280 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2281 is dropped immediately after valid headers, the next thing we will see is EOF.
2282 We must test for this specially, as further down the reading of the data is
2283 skipped if already at EOF. */
2285 if (smtp_input && (receive_feof)())
2287 smtp_reply = handle_lost_connection(US" (after header)");
2289 goto TIDYUP; /* Skip to end of function */
2292 /* If this is a filter test run and no headers were read, output a warning
2293 in case there is a mistake in the test message. */
2295 if (filter_test != FTEST_NONE && header_list->next == NULL)
2296 printf("Warning: no message headers read\n");
2299 /* Scan the headers to identify them. Some are merely marked for later
2300 processing; some are dealt with here. */
2302 for (header_line * h = header_list->next; h; h = h->next)
2304 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2305 if (is_resent) contains_resent_headers = TRUE;
2307 switch (header_checkname(h, is_resent))
2310 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2314 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2317 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2320 if (!resents_exist || is_resent) date_header_exists = TRUE;
2323 /* Same comments as about Return-Path: below. */
2325 case htype_delivery_date:
2326 if (delivery_date_remove) h->type = htype_old;
2329 /* Same comments as about Return-Path: below. */
2331 case htype_envelope_to:
2332 if (envelope_to_remove) h->type = htype_old;
2335 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2336 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2337 header consists of just the login id of the user who called Exim, rewrite
2338 it with the gecos field first. Apply this rule to Resent-From: if there
2339 are resent- fields. */
2342 h->type = htype_from;
2343 if (!resents_exist || is_resent)
2349 uschar *s = Ustrchr(h->text, ':') + 1;
2350 while (isspace(*s)) s++;
2351 len = h->slen - (s - h->text) - 1;
2352 if (Ustrlen(originator_login) == len &&
2353 strncmpic(s, originator_login, len) == 0)
2355 uschar *name = is_resent? US"Resent-From" : US"From";
2356 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2357 originator_login, qualify_domain_sender);
2358 from_header = header_last;
2359 h->type = htype_old;
2360 DEBUG(D_receive|D_rewrite)
2361 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2367 /* Identify the Message-id: header for generating "in-reply-to" in the
2368 autoreply transport. For incoming logging, save any resent- value. In both
2369 cases, take just the first of any multiples. */
2372 if (!msgid_header && (!resents_exist || is_resent))
2379 /* Flag all Received: headers */
2381 case htype_received:
2382 h->type = htype_received;
2386 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2388 case htype_reply_to:
2389 h->type = htype_reply_to;
2392 /* The Return-path: header is supposed to be added to messages when
2393 they leave the SMTP system. We shouldn't receive messages that already
2394 contain Return-path. However, since Exim generates Return-path: on
2395 local delivery, resent messages may well contain it. We therefore
2396 provide an option (which defaults on) to remove any Return-path: headers
2397 on input. Removal actually means flagging as "old", which prevents the
2398 header being transmitted with the message. */
2400 case htype_return_path:
2401 if (return_path_remove) h->type = htype_old;
2403 /* If we are testing a mail filter file, use the value of the
2404 Return-Path: header to set up the return_path variable, which is not
2405 otherwise set. However, remove any <> that surround the address
2406 because the variable doesn't have these. */
2408 if (filter_test != FTEST_NONE)
2410 uschar *start = h->text + 12;
2411 uschar *end = start + Ustrlen(start);
2412 while (isspace(*start)) start++;
2413 while (end > start && isspace(end[-1])) end--;
2414 if (*start == '<' && end[-1] == '>')
2419 return_path = string_copyn(start, end - start);
2420 printf("Return-path taken from \"Return-path:\" header line\n");
2424 /* If there is a "Sender:" header and the message is locally originated,
2425 and from an untrusted caller and suppress_local_fixups is not set, or if we
2426 are in submission mode for a remote message, mark it "old" so that it will
2427 not be transmitted with the message, unless active_local_sender_retain is
2428 set. (This can only be true if active_local_from_check is false.) If there
2429 are any resent- headers in the message, apply this rule to Resent-Sender:
2430 instead of Sender:. Messages with multiple resent- header sets cannot be
2431 tidily handled. (For this reason, at least one MUA - Pine - turns old
2432 resent- headers into X-resent- headers when resending, leaving just one
2436 h->type = !f.active_local_sender_retain
2437 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2438 || f.submission_mode
2440 && (!resents_exist || is_resent)
2441 ? htype_old : htype_sender;
2444 /* Remember the Subject: header for logging. There is no Resent-Subject */
2450 /* "To:" gets flagged, and the existence of a recipient header is noted,
2451 whether it's resent- or not. */
2456 to_or_cc_header_exists = TRUE;
2462 /* Extract recipients from the headers if that is required (the -t option).
2463 Note that this is documented as being done *before* any address rewriting takes
2464 place. There are two possibilities:
2466 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2467 recipients already listed are to be REMOVED from the message. Smail 3 works
2468 like this. We need to build a non-recipients tree for that list, because in
2469 subsequent processing this data is held in a tree and that's what the
2470 spool_write_header() function expects. Make sure that non-recipient addresses
2471 are fully qualified and rewritten if necessary.
2473 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2474 those in the command line arguments (and it is rumoured some other MTAs do
2475 this). Therefore, there is an option to make Exim behave this way.
2477 *** Notes on "Resent-" header lines ***
2479 The presence of resent-headers in the message makes -t horribly ambiguous.
2480 Experiments with sendmail showed that it uses recipients for all resent-
2481 headers, totally ignoring the concept of "sets of resent- headers" as described
2482 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2483 with all the addresses in one instance of each header.
2485 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2486 error for -t if there were resent- headers in the message. However, after a
2487 discussion on the mailing list, I've learned that there are MUAs that use
2488 resent- headers with -t, and also that the stuff about sets of resent- headers
2489 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2490 message with -t and resent- header lines makes sure that only *its* resent-
2491 headers are present; previous ones are often renamed as X-resent- for example.
2493 Consequently, Exim has been changed so that, if any resent- header lines are
2494 present, the recipients are taken from all of the appropriate resent- lines,
2495 and not from the ordinary To:, Cc:, etc. */
2500 error_block **bnext = &bad_addresses;
2502 if (extract_addresses_remove_arguments)
2504 while (recipients_count-- > 0)
2506 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2507 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2508 tree_add_nonrecipient(s);
2510 recipients_list = NULL;
2511 recipients_count = recipients_list_max = 0;
2514 /* Now scan the headers */
2516 for (header_line * h = header_list->next; h; h = h->next)
2518 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2519 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2521 uschar *s = Ustrchr(h->text, ':') + 1;
2522 while (isspace(*s)) s++;
2524 f.parse_allow_group = TRUE; /* Allow address group syntax */
2528 uschar *ss = parse_find_address_end(s, FALSE);
2529 uschar *recipient, *errmess, *pp;
2530 int start, end, domain;
2532 /* Check on maximum */
2534 if (recipients_max > 0 && ++rcount > recipients_max)
2535 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2536 US"message rejected: ", error_rc, stdin, NULL);
2537 /* Does not return */
2539 /* Make a copy of the address, and remove any internal newlines. These
2540 may be present as a result of continuations of the header line. The
2541 white space that follows the newline must not be removed - it is part
2544 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2545 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2550 BOOL b = allow_utf8_domains;
2551 allow_utf8_domains = TRUE;
2553 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2557 if (string_is_utf8(recipient))
2558 message_smtputf8 = TRUE;
2560 allow_utf8_domains = b;
2564 /* Keep a list of all the bad addresses so we can send a single
2565 error message at the end. However, an empty address is not an error;
2566 just ignore it. This can come from an empty group list like
2568 To: Recipients of list:;
2570 If there are no recipients at all, an error will occur later. */
2572 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2574 int len = Ustrlen(s);
2575 error_block *b = store_get(sizeof(error_block), FALSE);
2576 while (len > 0 && isspace(s[len-1])) len--;
2578 b->text1 = string_printing(string_copyn(s, len));
2584 /* If the recipient is already in the nonrecipients tree, it must
2585 have appeared on the command line with the option extract_addresses_
2586 remove_arguments set. Do not add it to the recipients, and keep a note
2587 that this has happened, in order to give a better error if there are
2588 no recipients left. */
2590 else if (recipient != NULL)
2592 if (tree_search(tree_nonrecipients, recipient) == NULL)
2593 receive_add_recipient(recipient, -1);
2595 extracted_ignored = TRUE;
2598 /* Move on past this address */
2600 s = ss + (*ss? 1:0);
2601 while (isspace(*s)) s++;
2602 } /* Next address */
2604 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2605 f.parse_found_group = FALSE;
2607 /* If this was the bcc: header, mark it "old", which means it
2608 will be kept on the spool, but not transmitted as part of the
2611 if (h->type == htype_bcc) h->type = htype_old;
2612 } /* For appropriate header line */
2613 } /* For each header line */
2617 /* Now build the unique message id. This has changed several times over the
2618 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2619 Retaining all the history in the comment has become too unwieldy - read
2620 previous release sources if you want it.
2622 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2623 The first part is the current time, in seconds. The second part is the current
2624 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2625 can hold a number in the range 0-3843. It used to be a computed sequence
2626 number, but is now the fractional component of the current time in units of
2627 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2628 received, Exim ensures that the timer has ticked at the appropriate level
2629 before proceeding, to avoid duplication if the pid happened to be re-used
2630 within the same time period. It seems likely that most messages will take at
2631 least half a millisecond to be received, so no delay will normally be
2632 necessary. At least for some time...
2634 There is a modification when localhost_number is set. Formerly this was allowed
2635 to be as large as 255. Now it is restricted to the range 0-16, and the final
2636 component of the message id becomes (localhost_number * 200) + fractional time
2637 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2639 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2640 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2641 still allows the tttttt field to hold a large enough number to last for some
2642 more decades, and the final two-digit field can hold numbers up to 1295, which
2643 is enough for milliseconds (instead of 1/2000 of a second).
2645 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2646 pid, so it is probably safe because pids have to be positive. The
2647 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2648 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2650 Note that string_base62() returns its data in a static storage block, so it
2651 must be copied before calling string_base62() again. It always returns exactly
2654 There doesn't seem to be anything in the RFC which requires a message id to
2655 start with a letter, but Smail was changed to ensure this. The external form of
2656 the message id (as supplied by string expansion) therefore starts with an
2657 additional leading 'E'. The spool file names do not include this leading
2658 letter and it is not used internally.
2660 NOTE: If ever the format of message ids is changed, the regular expression for
2661 checking that a string is in this format must be updated in a corresponding
2662 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2663 must also be changed to reflect the correct string length. The queue-sort code
2664 needs to know the layout. Then, of course, other programs that rely on the
2665 message id format will need updating too. */
2667 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2668 message_id[6] = '-';
2669 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2671 /* Deal with the case where the host number is set. The value of the number was
2672 checked when it was read, to ensure it isn't too big. The timing granularity is
2673 left in id_resolution so that an appropriate wait can be done after receiving
2674 the message, if necessary (we hope it won't be). */
2676 if (host_number_string)
2678 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2679 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2680 string_base62((long int)(
2681 host_number * (1000000/id_resolution) +
2682 message_id_tv.tv_usec/id_resolution)) + 4);
2685 /* Host number not set: final field is just the fractional time at an
2686 appropriate resolution. */
2690 id_resolution = BASE_62 == 62 ? 500 : 1000;
2691 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2692 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2695 /* Add the current message id onto the current process info string if
2698 (void)string_format(process_info + process_info_len,
2699 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2701 /* If we are using multiple input directories, set up the one for this message
2702 to be the least significant base-62 digit of the time of arrival. Otherwise
2703 ensure that it is an empty string. */
2705 set_subdir_str(message_subdir, message_id, 0);
2707 /* Now that we have the message-id, if there is no message-id: header, generate
2708 one, but only for local (without suppress_local_fixups) or submission mode
2709 messages. This can be user-configured if required, but we had better flatten
2710 any illegal characters therein. */
2713 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2715 uschar *id_text = US"";
2716 uschar *id_domain = primary_hostname;
2719 /* Permit only letters, digits, dots, and hyphens in the domain */
2721 if (message_id_domain)
2723 uschar *new_id_domain = expand_string(message_id_domain);
2726 if (!f.expand_string_forcedfail)
2727 log_write(0, LOG_MAIN|LOG_PANIC,
2728 "expansion of \"%s\" (message_id_header_domain) "
2729 "failed: %s", message_id_domain, expand_string_message);
2731 else if (*new_id_domain)
2733 id_domain = new_id_domain;
2734 for (uschar * p = id_domain; *p; p++)
2735 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2739 /* Permit all characters except controls and RFC 2822 specials in the
2740 additional text part. */
2742 if (message_id_text)
2744 uschar *new_id_text = expand_string(message_id_text);
2747 if (!f.expand_string_forcedfail)
2748 log_write(0, LOG_MAIN|LOG_PANIC,
2749 "expansion of \"%s\" (message_id_header_text) "
2750 "failed: %s", message_id_text, expand_string_message);
2752 else if (*new_id_text)
2754 id_text = new_id_text;
2755 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2759 /* Add the header line.
2760 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2761 appended, to preserve classical expectations of header ordering. */
2763 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2764 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2765 *id_text == 0 ? "" : ".", id_text, id_domain);
2767 /* Arrange for newly-created Message-Id to be logged */
2771 msgid_header_newly_created = TRUE;
2776 /* If we are to log recipients, keep a copy of the raw ones before any possible
2777 rewriting. Must copy the count, because later ACLs and the local_scan()
2778 function may mess with the real recipients. */
2780 if (LOGGING(received_recipients))
2782 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2783 for (int i = 0; i < recipients_count; i++)
2784 raw_recipients[i] = string_copy(recipients_list[i].address);
2785 raw_recipients_count = recipients_count;
2788 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2789 recipients will get here only if the conditions were right (allow_unqualified_
2790 recipient is TRUE). */
2792 for (int i = 0; i < recipients_count; i++)
2793 recipients_list[i].address =
2794 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2795 global_rewrite_rules, rewrite_existflags);
2797 /* If there is no From: header, generate one for local (without
2798 suppress_local_fixups) or submission_mode messages. If there is no sender
2799 address, but the sender is local or this is a local delivery error, use the
2800 originator login. This shouldn't happen for genuine bounces, but might happen
2801 for autoreplies. The addition of From: must be done *before* checking for the
2802 possible addition of a Sender: header, because untrusted_set_sender allows an
2803 untrusted user to set anything in the envelope (which might then get info
2804 From:) but we still want to ensure a valid Sender: if it is required. */
2807 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2809 const uschar * oname = US"";
2811 /* Use the originator_name if this is a locally submitted message and the
2812 caller is not trusted. For trusted callers, use it only if -F was used to
2813 force its value or if we have a non-SMTP message for which -f was not used
2814 to set the sender. */
2816 if (!sender_host_address)
2818 if (!f.trusted_caller || f.sender_name_forced ||
2819 (!smtp_input && !f.sender_address_forced))
2820 oname = originator_name;
2823 /* For non-locally submitted messages, the only time we use the originator
2824 name is when it was forced by the /name= option on control=submission. */
2826 else if (submission_name) oname = submission_name;
2828 /* Envelope sender is empty */
2830 if (!*sender_address)
2832 uschar *fromstart, *fromend;
2834 fromstart = string_sprintf("%sFrom: %s%s",
2835 resent_prefix, oname, *oname ? " <" : "");
2836 fromend = *oname ? US">" : US"";
2838 if (f.sender_local || f.local_error_message)
2839 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2840 local_part_quote(originator_login), qualify_domain_sender,
2843 else if (f.submission_mode && authenticated_id)
2845 if (!submission_domain)
2846 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2847 local_part_quote(authenticated_id), qualify_domain_sender,
2850 else if (!*submission_domain) /* empty => whole address set */
2851 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2855 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2856 local_part_quote(authenticated_id), submission_domain, fromend);
2858 from_header = header_last; /* To get it checked for Sender: */
2862 /* There is a non-null envelope sender. Build the header using the original
2863 sender address, before any rewriting that might have been done while
2868 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2871 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2874 from_header = header_last; /* To get it checked for Sender: */
2879 /* If the sender is local (without suppress_local_fixups), or if we are in
2880 submission mode and there is an authenticated_id, check that an existing From:
2881 is correct, and if not, generate a Sender: header, unless disabled. Any
2882 previously-existing Sender: header was removed above. Note that sender_local,
2883 as well as being TRUE if the caller of exim is not trusted, is also true if a
2884 trusted caller did not supply a -f argument for non-smtp input. To allow
2885 trusted callers to forge From: without supplying -f, we have to test explicitly
2886 here. If the From: header contains more than one address, then the call to
2887 parse_extract_address fails, and a Sender: header is inserted, as required. */
2890 && ( f.active_local_from_check
2891 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2892 || f.submission_mode && authenticated_id
2895 BOOL make_sender = TRUE;
2896 int start, end, domain;
2898 uschar *from_address =
2899 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2900 &start, &end, &domain, FALSE);
2901 uschar *generated_sender_address;
2903 generated_sender_address = f.submission_mode
2904 ? !submission_domain
2905 ? string_sprintf("%s@%s",
2906 local_part_quote(authenticated_id), qualify_domain_sender)
2907 : !*submission_domain /* empty => full address */
2908 ? string_sprintf("%s", authenticated_id)
2909 : string_sprintf("%s@%s",
2910 local_part_quote(authenticated_id), submission_domain)
2911 : string_sprintf("%s@%s",
2912 local_part_quote(originator_login), qualify_domain_sender);
2914 /* Remove permitted prefixes and suffixes from the local part of the From:
2915 address before doing the comparison with the generated sender. */
2920 uschar *at = domain ? from_address + domain - 1 : NULL;
2923 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2924 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2926 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2927 from_address += slen;
2931 if ( strcmpic(generated_sender_address, from_address) == 0
2932 || (!domain && strcmpic(from_address, originator_login) == 0))
2933 make_sender = FALSE;
2936 /* We have to cause the Sender header to be rewritten if there are
2937 appropriate rewriting rules. */
2940 if (f.submission_mode && !submission_name)
2941 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2942 generated_sender_address);
2944 header_add(htype_sender, "%sSender: %s <%s>\n",
2946 f.submission_mode ? submission_name : originator_name,
2947 generated_sender_address);
2949 /* Ensure that a non-null envelope sender address corresponds to the
2950 submission mode sender address. */
2952 if (f.submission_mode && *sender_address)
2954 if (!sender_address_unrewritten)
2955 sender_address_unrewritten = sender_address;
2956 sender_address = generated_sender_address;
2957 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2958 log_write(L_address_rewrite, LOG_MAIN,
2959 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2960 sender_address_unrewritten, generated_sender_address);
2964 /* If there are any rewriting rules, apply them to the sender address, unless
2965 it has already been rewritten as part of verification for SMTP input. */
2967 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2969 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2970 global_rewrite_rules, rewrite_existflags);
2971 DEBUG(D_receive|D_rewrite)
2972 debug_printf("rewritten sender = %s\n", sender_address);
2976 /* The headers must be run through rewrite_header(), because it ensures that
2977 addresses are fully qualified, as well as applying any rewriting rules that may
2980 Qualification of header addresses in a message from a remote host happens only
2981 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2982 appropriate. For local messages, qualification always happens, unless -bnq is
2983 used to explicitly suppress it. No rewriting is done for an unqualified address
2984 that is left untouched.
2986 We start at the second header, skipping our own Received:. This rewriting is
2987 documented as happening *after* recipient addresses are taken from the headers
2988 by the -t command line option. An added Sender: gets rewritten here. */
2990 for (header_line * h = header_list->next; h; h = h->next)
2992 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2993 rewrite_existflags, TRUE);
2998 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2999 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3000 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3001 exists, this applies to the set of resent- headers rather than the normal set.
3003 The requirement for a recipient header has been removed in RFC 2822. At this
3004 point in the code, earlier versions of Exim added a To: header for locally
3005 submitted messages, and an empty Bcc: header for others. In the light of the
3006 changes in RFC 2822, this was dropped in November 2003. */
3009 /* If there is no date header, generate one if the message originates locally
3010 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3011 submission mode flag is set. Messages without Date: are not valid, but it seems
3012 to be more confusing if Exim adds one to all remotely-originated messages.
3013 As per Message-Id, we prepend if resending, else append.
3016 if ( !date_header_exists
3017 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3018 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3019 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3021 search_tidyup(); /* Free any cached resources */
3023 /* Show the complete set of headers if debugging. Note that the first one (the
3024 new Received:) has not yet been set. */
3028 debug_printf(">>Headers after rewriting and local additions:\n");
3029 for (header_line * h = header_list->next; h; h = h->next)
3030 debug_printf("%c %s", h->type, h->text);
3034 /* The headers are now complete in store. If we are running in filter
3035 testing mode, that is all this function does. Return TRUE if the message
3036 ended with a dot. */
3038 if (filter_test != FTEST_NONE)
3040 process_info[process_info_len] = 0;
3041 return message_ended == END_DOT;
3044 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3045 think more if it could be handled. Cannot do onward CHUNKING unless
3046 inbound is, but inbound chunking ought to be ok with outbound plain.
3047 Could we do onward CHUNKING given inbound CHUNKING?
3049 if (chunking_state > CHUNKING_OFFERED)
3050 cancel_cutthrough_connection(FALSE, US"chunking active");
3052 /* Cutthrough delivery:
3053 We have to create the Received header now rather than at the end of reception,
3054 so the timestamp behaviour is a change to the normal case.
3055 Having created it, send the headers to the destination. */
3057 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3059 if (received_count > received_headers_max)
3061 cancel_cutthrough_connection(TRUE, US"too many headers");
3062 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3063 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3064 "Too many \"Received\" headers",
3066 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3067 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3068 message_id[0] = 0; /* Indicate no message accepted */
3069 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3070 goto TIDYUP; /* Skip to end of function */
3072 received_header_gen();
3073 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3074 (void) cutthrough_headers_send();
3078 /* Open a new spool file for the data portion of the message. We need
3079 to access it both via a file descriptor and a stream. Try to make the
3080 directory if it isn't there. */
3082 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3083 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3085 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3087 if (errno == ENOENT)
3089 (void) directory_make(spool_directory,
3090 spool_sname(US"input", message_subdir),
3091 INPUT_DIRECTORY_MODE, TRUE);
3092 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3095 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3096 spool_name, strerror(errno));
3099 /* Make sure the file's group is the Exim gid, and double-check the mode
3100 because the group setting doesn't always get set automatically. */
3102 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3103 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3104 "Failed setting ownership on spool file %s: %s",
3105 spool_name, strerror(errno));
3106 (void)fchmod(data_fd, SPOOL_MODE);
3108 /* We now have data file open. Build a stream for it and lock it. We lock only
3109 the first line of the file (containing the message ID) because otherwise there
3110 are problems when Exim is run under Cygwin (I'm told). See comments in
3111 spool_in.c, where the same locking is done. */
3113 spool_data_file = fdopen(data_fd, "w+");
3114 lock_data.l_type = F_WRLCK;
3115 lock_data.l_whence = SEEK_SET;
3116 lock_data.l_start = 0;
3117 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3119 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3120 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3121 errno, strerror(errno));
3123 /* We have an open, locked data file. Write the message id to it to make it
3124 self-identifying. Then read the remainder of the input of this message and
3125 write it to the data file. If the variable next != NULL, it contains the first
3126 data line (which was read as a header but then turned out not to have the right
3127 format); write it (remembering that it might contain binary zeros). The result
3128 of fwrite() isn't inspected; instead we call ferror() below. */
3130 fprintf(spool_data_file, "%s-D\n", message_id);
3133 uschar *s = next->text;
3134 int len = next->slen;
3135 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3136 body_linecount++; /* Assumes only 1 line */
3139 /* Note that we might already be at end of file, or the logical end of file
3140 (indicated by '.'), or might have encountered an error while writing the
3141 message id or "next" line. */
3143 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3147 message_ended = chunking_state <= CHUNKING_OFFERED
3148 ? read_message_data_smtp(spool_data_file)
3150 ? read_message_bdat_smtp_wire(spool_data_file)
3151 : read_message_bdat_smtp(spool_data_file);
3152 receive_linecount++; /* The terminating "." line */
3155 message_ended = read_message_data(spool_data_file);
3157 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3158 message_linecount += body_linecount;
3160 switch (message_ended)
3162 /* Handle premature termination of SMTP */
3167 Uunlink(spool_name); /* Lose data file when closed */
3168 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3169 message_id[0] = 0; /* Indicate no message accepted */
3170 smtp_reply = handle_lost_connection(US"");
3172 goto TIDYUP; /* Skip to end of function */
3176 /* Handle message that is too big. Don't use host_or_ident() in the log
3177 message; we want to see the ident value even for non-remote messages. */
3180 Uunlink(spool_name); /* Lose the data file when closed */
3181 cancel_cutthrough_connection(TRUE, US"mail too big");
3182 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3184 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3185 "message too big: read=%d max=%d",
3187 sender_fullhost ? " H=" : "",
3188 sender_fullhost ? sender_fullhost : US"",
3189 sender_ident ? " U=" : "",
3190 sender_ident ? sender_ident : US"",
3192 thismessage_size_limit);
3196 smtp_reply = US"552 Message size exceeds maximum permitted";
3197 message_id[0] = 0; /* Indicate no message accepted */
3198 goto TIDYUP; /* Skip to end of function */
3202 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3203 give_local_error(ERRMESS_TOOBIG,
3204 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3205 US"message rejected: ", error_rc, spool_data_file, header_list);
3206 /* Does not return */
3210 /* Handle bad BDAT protocol sequence */
3213 Uunlink(spool_name); /* Lose the data file when closed */
3214 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3215 smtp_reply = US""; /* Response already sent */
3216 message_id[0] = 0; /* Indicate no message accepted */
3217 goto TIDYUP; /* Skip to end of function */
3221 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3222 example, there may be some expansion in an ACL that uses a timer.) */
3224 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3226 /* The message body has now been read into the data file. Call fflush() to
3227 empty the buffers in C, and then call fsync() to get the data written out onto
3228 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3229 having to do this). If there was an I/O error on either input or output,
3230 attempt to send an error message, and unlink the spool file. For non-SMTP input
3231 we can then give up. Note that for SMTP input we must swallow the remainder of
3232 the input in cases of output errors, since the far end doesn't expect to see
3233 anything until the terminating dot line is sent. */
3235 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3236 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3238 uschar *msg_errno = US strerror(errno);
3239 BOOL input_error = (receive_ferror)() != 0;
3240 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3241 input_error? "Input read" : "Spool write",
3243 sender_fullhost ? sender_fullhost : sender_ident);
3245 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3246 Uunlink(spool_name); /* Lose the data file */
3247 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3252 smtp_reply = US"451 Error while reading input data";
3255 smtp_reply = US"451 Error while writing spool file";
3256 receive_swallow_smtp();
3258 message_id[0] = 0; /* Indicate no message accepted */
3259 goto TIDYUP; /* Skip to end of function */
3264 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3265 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3267 /* Does not return */
3272 /* No I/O errors were encountered while writing the data file. */
3274 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3275 gettimeofday(&received_time_complete, NULL);
3278 /* If there were any bad addresses extracted by -t, or there were no recipients
3279 left after -t, send a message to the sender of this message, or write it to
3280 stderr if the error handling option is set that way. Note that there may
3281 legitimately be no recipients for an SMTP message if they have all been removed
3284 We need to rewind the data file in order to read it. In the case of no
3285 recipients or stderr error writing, throw the data file away afterwards, and
3286 exit. (This can't be SMTP, which always ensures there's at least one
3287 syntactically good recipient address.) */
3289 if (extract_recip && (bad_addresses || recipients_count == 0))
3293 if (recipients_count == 0) debug_printf("*** No recipients\n");
3296 debug_printf("*** Bad address(es)\n");
3297 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3298 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3302 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3303 message_id, bad_addresses ? "bad addresses" : "no recipients");
3305 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3307 /* If configured to send errors to the sender, but this fails, force
3308 a failure error code. We use a special one for no recipients so that it
3309 can be detected by the autoreply transport. Otherwise error_rc is set to
3310 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3311 it is EXIT_SUCCESS. */
3313 if (error_handling == ERRORS_SENDER)
3315 if (!moan_to_sender(
3317 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3318 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3319 bad_addresses, header_list, spool_data_file, FALSE
3321 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3326 if (extracted_ignored)
3327 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3329 fprintf(stderr, "exim: no recipients in message\n");
3332 fprintf(stderr, "exim: invalid address%s",
3333 bad_addresses->next ? "es:\n" : ":");
3334 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3335 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3336 bad_addresses->text2);
3340 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3342 Uunlink(spool_name);
3343 (void)fclose(spool_data_file);
3344 exim_exit(error_rc);
3348 /* Data file successfully written. Generate text for the Received: header by
3349 expanding the configured string, and adding a timestamp. By leaving this
3350 operation till now, we ensure that the timestamp is the time that message
3351 reception was completed. However, this is deliberately done before calling the
3352 data ACL and local_scan().
3354 This Received: header may therefore be inspected by the data ACL and by code in
3355 the local_scan() function. When they have run, we update the timestamp to be
3356 the final time of reception.
3358 If there is just one recipient, set up its value in the $received_for variable
3359 for use when we generate the Received: header.
3361 Note: the checking for too many Received: headers is handled by the delivery
3363 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3365 if (!received_header->text) /* Non-cutthrough case */
3367 received_header_gen();
3369 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3371 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3372 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3374 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3375 now, before running the DATA ACL. */
3377 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3380 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3381 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3383 /* If an ACL is specified for checking things at this stage of reception of a
3384 message, run it, unless all the recipients were removed by "discard" in earlier
3385 ACLs. That is the only case in which recipients_count can be zero at this
3386 stage. Set deliver_datafile to point to the data file so that $message_body and
3387 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3390 deliver_datafile = data_fd;
3393 f.enable_dollar_recipients = TRUE;
3395 if (recipients_count == 0)
3396 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3400 /* Handle interactive SMTP messages */
3402 if (smtp_input && !smtp_batched_input)
3405 #ifndef DISABLE_DKIM
3406 if (!f.dkim_disable_verify)
3408 /* Finish verification */
3409 dkim_exim_verify_finish();
3411 /* Check if we must run the DKIM ACL */
3412 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3414 uschar * dkim_verify_signers_expanded =
3415 expand_string(dkim_verify_signers);
3416 gstring * results = NULL;
3420 gstring * seen_items = NULL;
3421 int old_pool = store_pool;
3423 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3425 if (!(ptr = dkim_verify_signers_expanded))
3426 log_write(0, LOG_MAIN|LOG_PANIC,
3427 "expansion of dkim_verify_signers option failed: %s",
3428 expand_string_message);
3430 /* Default to OK when no items are present */
3432 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3434 /* Prevent running ACL for an empty item */
3435 if (!item || !*item) continue;
3437 /* Only run ACL once for each domain or identity,
3438 no matter how often it appears in the expanded list. */
3442 const uschar * seen_items_list = string_from_gstring(seen_items);
3444 BOOL seen_this_item = FALSE;
3446 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3448 if (Ustrcmp(seen_item,item) == 0)
3450 seen_this_item = TRUE;
3457 debug_printf("acl_smtp_dkim: skipping signer %s, "
3458 "already seen\n", item);
3462 seen_items = string_catn(seen_items, US":", 1);
3464 seen_items = string_cat(seen_items, item);
3466 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3470 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3471 "skipping remaining items\n", rc, item);
3472 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3476 dkim_verify_status = string_from_gstring(results);
3477 store_pool = old_pool;
3478 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3481 recipients_count = 0;
3482 blackholed_by = US"DKIM ACL";
3484 blackhole_log_msg = string_sprintf(": %s", log_msg);
3488 Uunlink(spool_name);
3489 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3490 smtp_yield = FALSE; /* No more messages after dropped connection */
3491 smtp_reply = US""; /* Indicate reply already sent */
3492 message_id[0] = 0; /* Indicate no message accepted */
3493 goto TIDYUP; /* Skip to end of function */
3497 dkim_exim_verify_log_all();
3499 #endif /* DISABLE_DKIM */
3501 #ifdef WITH_CONTENT_SCAN
3502 if ( recipients_count > 0
3504 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3507 #endif /* WITH_CONTENT_SCAN */
3509 #ifdef SUPPORT_DMARC
3510 dmarc_store_data(from_header);
3513 #ifndef DISABLE_PRDR
3514 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3517 int all_fail = FAIL;
3519 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3520 /* Loop through recipients, responses must be in same order received */
3521 for (unsigned int c = 0; recipients_count > c; c++)
3523 uschar * addr= recipients_list[c].address;
3524 uschar * msg= US"PRDR R=<%s> %s";
3527 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3528 addr, c+1, recipients_count);
3529 rc = acl_check(ACL_WHERE_PRDR, addr,
3530 acl_smtp_data_prdr, &user_msg, &log_msg);
3532 /* If any recipient rejected content, indicate it in final message */
3534 /* If all recipients rejected, indicate in final message */
3539 case OK: case DISCARD: code = US"250"; break;
3540 case DEFER: code = US"450"; break;
3541 default: code = US"550"; break;
3543 if (user_msg != NULL)
3544 smtp_user_msg(code, user_msg);
3549 case OK: case DISCARD:
3550 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3552 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3554 msg = string_sprintf(CS msg, addr, "refusal"); break;
3556 smtp_user_msg(code, msg);
3558 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3559 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3560 else log_write(0, LOG_MAIN, "%s", CS msg);
3562 if (rc != OK) { receive_remove_recipient(addr); c--; }
3564 /* Set up final message, used if data acl gives OK */
3565 smtp_reply = string_sprintf("%s id=%s message %s",
3566 all_fail == FAIL ? US"550" : US"250",
3569 ? US"rejected for all recipients"
3572 : US"accepted for some recipients");
3573 if (recipients_count == 0)
3575 message_id[0] = 0; /* Indicate no message accepted */
3580 prdr_requested = FALSE;
3581 #endif /* !DISABLE_PRDR */
3583 /* Check the recipients count again, as the MIME ACL might have changed
3586 if (acl_smtp_data != NULL && recipients_count > 0)
3588 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3589 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3592 recipients_count = 0;
3593 blackholed_by = US"DATA ACL";
3595 blackhole_log_msg = string_sprintf(": %s", log_msg);
3596 cancel_cutthrough_connection(TRUE, US"data acl discard");
3600 Uunlink(spool_name);
3601 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3602 #ifdef WITH_CONTENT_SCAN
3605 #ifdef EXPERIMENTAL_DCC
3608 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3609 smtp_yield = FALSE; /* No more messages after dropped connection */
3610 smtp_reply = US""; /* Indicate reply already sent */
3611 message_id[0] = 0; /* Indicate no message accepted */
3612 goto TIDYUP; /* Skip to end of function */
3617 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3618 we cannot take different actions for permanent and temporary rejections. */
3623 #ifdef WITH_CONTENT_SCAN
3624 if ( acl_not_smtp_mime
3625 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3629 #endif /* WITH_CONTENT_SCAN */
3633 uschar *user_msg, *log_msg;
3634 f.authentication_local = TRUE;
3635 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3638 recipients_count = 0;
3639 blackholed_by = US"non-SMTP ACL";
3641 blackhole_log_msg = string_sprintf(": %s", log_msg);
3645 Uunlink(spool_name);
3646 #ifdef WITH_CONTENT_SCAN
3649 #ifdef EXPERIMENTAL_DCC
3652 /* The ACL can specify where rejections are to be logged, possibly
3653 nowhere. The default is main and reject logs. */
3655 if (log_reject_target)
3656 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3657 sender_address, log_msg);
3659 if (!user_msg) user_msg = US"local configuration problem";
3660 if (smtp_batched_input)
3661 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3662 /* Does not return */
3665 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3666 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3667 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3669 /* Does not return */
3672 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3676 /* The applicable ACLs have been run */
3678 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3679 if (f.queue_only_policy) queued_by = US"ACL";
3682 #ifdef WITH_CONTENT_SCAN
3686 #ifdef EXPERIMENTAL_DCC
3691 #ifdef HAVE_LOCAL_SCAN
3692 /* The final check on the message is to run the scan_local() function. The
3693 version supplied with Exim always accepts, but this is a hook for sysadmins to
3694 supply their own checking code. The local_scan() function is run even when all
3695 the recipients have been discarded. */
3697 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3699 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3700 deleted, and the incident gets logged. */
3702 if (sigsetjmp(local_scan_env, 1) == 0)
3704 had_local_scan_crash = 0;
3705 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3706 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3707 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3708 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3710 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3711 local_scan_timeout);
3712 local_scan_data = NULL;
3714 had_local_scan_timeout = 0;
3715 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3716 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3717 rc = local_scan(data_fd, &local_scan_data);
3719 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3721 f.enable_dollar_recipients = FALSE;
3723 store_pool = POOL_MAIN; /* In case changed */
3724 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3727 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3728 os_non_restarting_signal(SIGFPE, SIG_DFL);
3729 os_non_restarting_signal(SIGILL, SIG_DFL);
3730 os_non_restarting_signal(SIGBUS, SIG_DFL);
3734 if (had_local_scan_crash)
3736 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3737 "signal %d - message temporarily rejected (size %d)",
3738 had_local_scan_crash, message_size);
3739 receive_bomb_out(US"local-scan-error", US"local verification problem");
3740 /* Does not return */
3742 if (had_local_scan_timeout)
3744 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3745 "message temporarily rejected (size %d)", message_size);
3746 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3747 /* Does not return */
3751 /* The length check is paranoia against some runaway code, and also because
3752 (for a success return) lines in the spool file are read into big_buffer. */
3754 if (local_scan_data)
3756 int len = Ustrlen(local_scan_data);
3757 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3758 local_scan_data = string_copyn(local_scan_data, len);
3761 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3763 if (!f.deliver_freeze) /* ACL might have already frozen */
3765 f.deliver_freeze = TRUE;
3766 deliver_frozen_at = time(NULL);
3767 frozen_by = US"local_scan()";
3769 rc = LOCAL_SCAN_ACCEPT;
3771 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3773 if (!f.queue_only_policy) /* ACL might have already queued */
3775 f.queue_only_policy = TRUE;
3776 queued_by = US"local_scan()";
3778 rc = LOCAL_SCAN_ACCEPT;
3781 /* Message accepted: remove newlines in local_scan_data because otherwise
3782 the spool file gets corrupted. Ensure that all recipients are qualified. */
3784 if (rc == LOCAL_SCAN_ACCEPT)
3786 if (local_scan_data)
3787 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3788 for (int i = 0; i < recipients_count; i++)
3790 recipient_item *r = recipients_list + i;
3791 r->address = rewrite_address_qualify(r->address, TRUE);
3793 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3795 if (recipients_count == 0 && !blackholed_by)
3796 blackholed_by = US"local_scan";
3799 /* Message rejected: newlines permitted in local_scan_data to generate
3800 multiline SMTP responses. */
3804 uschar *istemp = US"";
3808 errmsg = local_scan_data;
3810 Uunlink(spool_name); /* Cancel this message */
3814 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3815 "rejection given", rc);
3818 case LOCAL_SCAN_REJECT_NOLOGHDR:
3819 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3822 case LOCAL_SCAN_REJECT:
3823 smtp_code = US"550";
3824 if (!errmsg) errmsg = US"Administrative prohibition";
3827 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3828 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3831 case LOCAL_SCAN_TEMPREJECT:
3833 smtp_code = US"451";
3834 if (!errmsg) errmsg = US"Temporary local problem";
3835 istemp = US"temporarily ";
3839 g = string_append(NULL, 2, US"F=",
3840 sender_address[0] == 0 ? US"<>" : sender_address);
3841 g = add_host_info_for_log(g);
3843 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3844 string_from_gstring(g), istemp, string_printing(errmsg));
3847 if (!smtp_batched_input)
3849 smtp_respond(smtp_code, 3, TRUE, errmsg);
3850 message_id[0] = 0; /* Indicate no message accepted */
3851 smtp_reply = US""; /* Indicate reply already sent */
3852 goto TIDYUP; /* Skip to end of function */
3855 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3856 /* Does not return */
3859 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3860 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3861 US"message rejected by local scan code: ", error_rc, spool_data_file,
3863 /* Does not return */
3867 /* Reset signal handlers to ignore signals that previously would have caused
3868 the message to be abandoned. */
3870 signal(SIGTERM, SIG_IGN);
3871 signal(SIGINT, SIG_IGN);
3872 #endif /* HAVE_LOCAL_SCAN */
3875 /* Ensure the first time flag is set in the newly-received message. */
3877 f.deliver_firsttime = TRUE;
3879 #ifdef EXPERIMENTAL_BRIGHTMAIL
3881 { /* rewind data file */
3882 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3883 bmi_verdicts = bmi_process_message(header_list, data_fd);
3887 /* Update the timestamp in our Received: header to account for any time taken by
3888 an ACL or by local_scan(). The new time is the time that all reception
3889 processing is complete. */
3891 timestamp = expand_string(US"${tod_full}");
3892 tslen = Ustrlen(timestamp);
3894 memcpy(received_header->text + received_header->slen - tslen - 1,
3897 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3901 f.deliver_freeze = FALSE;
3902 f.queue_only_policy = FALSE;
3905 /* Keep the data file open until we have written the header file, in order to
3906 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3907 don't write the header file, and we unlink the data file. If writing the header
3908 file fails, we have failed to accept this message. */
3910 if (host_checking || blackholed_by)
3912 Uunlink(spool_name);
3913 msg_size = 0; /* Compute size for log line */
3914 for (header_line * h = header_list; h; h = h->next)
3915 if (h->type != '*') msg_size += h->slen;
3918 /* Write the -H file */
3921 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3923 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3924 Uunlink(spool_name); /* Lose the data file */
3928 smtp_reply = US"451 Error in writing spool file";
3929 message_id[0] = 0; /* Indicate no message accepted */
3934 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3935 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3937 /* Does not return */
3942 /* The message has now been successfully received. */
3944 receive_messagecount++;
3946 /* Add data size to written header size. We do not count the initial file name
3947 that is in the file, but we do add one extra for the notional blank line that
3948 precedes the data. This total differs from message_size in that it include the
3949 added Received: header and any other headers that got created locally. */
3951 if (fflush(spool_data_file))
3953 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3954 log_write(0, LOG_MAIN, "%s\n", errmsg);
3955 Uunlink(spool_name); /* Lose the data file */
3959 smtp_reply = US"451 Error in writing spool file";
3960 message_id[0] = 0; /* Indicate no message accepted */
3965 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3966 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3968 /* Does not return */
3971 fstat(data_fd, &statbuf);
3973 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3975 /* Generate a "message received" log entry. We do this by building up a dynamic
3976 string as required. We log the arrival of a new message while the
3977 file is still locked, just in case the machine is *really* fast, and delivers
3978 it first! Include any message id that is in the message - since the syntax of a
3979 message id is actually an addr-spec, we can use the parse routine to canonicalize
3982 rcvd_log_reset_point = store_mark();
3983 g = string_get(256);
3985 g = string_append(g, 2,
3986 fake_response == FAIL ? US"(= " : US"<= ",
3987 sender_address[0] == 0 ? US"<>" : sender_address);
3988 if (message_reference)
3989 g = string_append(g, 2, US" R=", message_reference);
3991 g = add_host_info_for_log(g);
3994 if (LOGGING(tls_cipher) && tls_in.cipher)
3996 g = string_append(g, 2, US" X=", tls_in.cipher);
3997 # ifndef DISABLE_TLS_RESUME
3998 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
3999 g = string_catn(g, US"*", 1);
4002 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4003 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4004 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4005 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4006 if (LOGGING(tls_sni) && tls_in.sni)
4007 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4010 if (sender_host_authenticated)
4012 g = string_append(g, 2, US" A=", sender_host_authenticated);
4013 if (authenticated_id)
4015 g = string_append(g, 2, US":", authenticated_id);
4016 if (LOGGING(smtp_mailauth) && authenticated_sender)
4017 g = string_append(g, 2, US":", authenticated_sender);
4021 #ifndef DISABLE_PRDR
4023 g = string_catn(g, US" PRDR", 5);
4026 #ifdef SUPPORT_PROXY
4027 if (proxy_session && LOGGING(proxy))
4028 g = string_append(g, 2, US" PRX=", proxy_local_address);
4031 if (chunking_state > CHUNKING_OFFERED)
4032 g = string_catn(g, US" K", 2);
4034 g = string_fmt_append(g, " S=%d", msg_size);
4036 /* log 8BITMIME mode announced in MAIL_FROM
4040 if (LOGGING(8bitmime))
4041 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4043 #ifndef DISABLE_DKIM
4044 if (LOGGING(dkim) && dkim_verify_overall)
4045 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4046 # ifdef EXPERIMENTAL_ARC
4047 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4048 g = string_catn(g, US" ARC", 4);
4052 if (LOGGING(receive_time))
4054 struct timeval diff = received_time_complete;
4055 timediff(&diff, &received_time);
4056 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4060 g = string_append(g, 2, US" Q=", queue_name);
4062 /* If an addr-spec in a message-id contains a quoted string, it can contain
4063 any characters except " \ and CR and so in particular it can contain NL!
4064 Therefore, make sure we use a printing-characters only version for the log.
4065 Also, allow for domain literals in the message id. */
4067 if ( LOGGING(msg_id) && msgid_header
4068 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4072 BOOL save_allow_domain_literals = allow_domain_literals;
4073 allow_domain_literals = TRUE;
4074 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4075 &errmsg, &start, &end, &domain, FALSE);
4076 allow_domain_literals = save_allow_domain_literals;
4078 g = string_append(g, 2,
4079 msgid_header_newly_created ? US" id*=" : US" id=",
4080 string_printing(old_id));
4083 /* If subject logging is turned on, create suitable printing-character
4084 text. By expanding $h_subject: we make use of the MIME decoding. */
4086 if (LOGGING(subject) && subject_header)
4088 uschar *p = big_buffer;
4089 uschar *ss = expand_string(US"$h_subject:");
4091 /* Backslash-quote any double quotes or backslashes so as to make a
4092 a C-like string, and turn any non-printers into escape sequences. */
4095 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4097 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4102 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4105 /* Terminate the string: string_cat() and string_append() leave room, but do
4106 not put the zero in. */
4108 (void) string_from_gstring(g);
4110 /* Create a message log file if message logs are being used and this message is
4111 not blackholed. Write the reception stuff to it. We used to leave message log
4112 creation until the first delivery, but this has proved confusing for some
4115 if (message_logs && !blackholed_by)
4118 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4120 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4124 (void)directory_make(spool_directory,
4125 spool_sname(US"msglog", message_subdir),
4126 MSGLOG_DIRECTORY_MODE, TRUE);
4127 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4131 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4132 m_name, strerror(errno));
4135 FILE *message_log = fdopen(fd, "a");
4138 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4139 m_name, strerror(errno));
4144 uschar *now = tod_stamp(tod_log);
4145 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4146 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4148 if (f.queue_only_policy) fprintf(message_log,
4149 "%s no immediate delivery: queued%s%s by %s\n", now,
4150 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4152 (void)fclose(message_log);
4157 /* Everything has now been done for a successful message except logging its
4158 arrival, and outputting an SMTP response. While writing to the log, set a flag
4159 to cause a call to receive_bomb_out() if the log cannot be opened. */
4161 f.receive_call_bombout = TRUE;
4163 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4164 connection has gone away. This can only be done if there is no unconsumed input
4165 waiting in the local input buffer. We can test for this by calling
4166 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4167 input to be sent following the final dot, so the presence of following input is
4170 If the connection is still present, but there is no unread input for the
4171 socket, the result of a select() call will be zero. If, however, the connection
4172 has gone away, or if there is pending input, the result of select() will be
4173 non-zero. The two cases can be distinguished by trying to read the next input
4174 character. If we succeed, we can unread it so that it remains in the local
4175 buffer for handling later. If not, the connection has been lost.
4177 Of course, since TCP/IP is asynchronous, there is always a chance that the
4178 connection will vanish between the time of this test and the sending of the
4179 response, but the chance of this happening should be small. */
4181 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4182 !receive_smtp_buffered())
4184 struct timeval tv = {.tv_sec = 0, .tv_usec = 0};
4185 fd_set select_check;
4186 FD_ZERO(&select_check);
4187 FD_SET(fileno(smtp_in), &select_check);
4189 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4191 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4192 if (c != EOF) (receive_ungetc)(c); else
4194 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4195 smtp_reply = US""; /* No attempt to send a response */
4196 smtp_yield = FALSE; /* Nothing more on this connection */
4198 /* Re-use the log line workspace */
4201 g = string_cat(g, US"SMTP connection lost after final dot");
4202 g = add_host_info_for_log(g);
4203 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4205 /* Delete the files for this aborted message. */
4207 Uunlink(spool_name);
4208 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4209 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4216 /* The connection has not gone away; we really are going to take responsibility
4217 for this message. */
4219 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4222 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4223 the sender's dot (below).
4224 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4225 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4226 in which case pass temp-reject back to initiator and dump the files.
4228 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4230 XXX We do not handle queue-only, freezing, or blackholes.
4232 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4234 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4235 /* Logging was done in finaldot() */
4238 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4239 cutthrough_done = ACCEPTED;
4240 break; /* message_id needed for SMTP accept below */
4242 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4243 ... for which, pass back the exact error */
4244 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4245 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4246 break; /* message_id needed for SMTP accept below */
4248 default: /* Unknown response, or error. Treat as temp-reject. */
4249 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4250 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4251 break; /* message_id needed for SMTP accept below */
4253 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4254 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4255 cutthrough_done = PERM_REJ;
4260 #ifndef DISABLE_PRDR
4261 if(!smtp_reply || prdr_requested)
4266 log_write(0, LOG_MAIN |
4267 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4268 (LOGGING(received_sender) ? LOG_SENDER : 0),
4271 /* Log any control actions taken by an ACL or local_scan(). */
4273 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4274 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4275 "no immediate delivery: queued%s%s by %s",
4276 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4279 f.receive_call_bombout = FALSE;
4281 /* The store for the main log message can be reused */
4282 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4284 /* If the message is frozen, and freeze_tell is set, do the telling. */
4286 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4287 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4288 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4289 message_id, frozen_by, sender_address);
4292 /* Either a message has been successfully received and written to the two spool
4293 files, or an error in writing the spool has occurred for an SMTP message, or
4294 an SMTP message has been rejected for policy reasons, or a message was passed on
4295 by cutthrough delivery. (For a non-SMTP message we will have already given up
4296 because there's no point in carrying on!) For non-cutthrough we must now close
4297 (and thereby unlock) the data file. In the successful case, this leaves the
4298 message on the spool, ready for delivery. In the error case, the spool file will
4299 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4302 For cutthrough we hold the data file locked until we have deleted it, otherwise
4303 a queue-runner could grab it in the window.
4305 A fflush() was done earlier in the expectation that any write errors on the
4306 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4307 possible for fclose() to fail - but what to do? What has happened to the lock
4308 if this happens? We can at least log it; if it is observed on some platform
4309 then we can think about properly declaring the message not-received. */
4313 /* In SMTP sessions we may receive several messages in one connection. After
4314 each one, we wait for the clock to tick at the level of message-id granularity.
4315 This is so that the combination of time+pid is unique, even on systems where the
4316 pid can be re-used within our time interval. We can't shorten the interval
4317 without re-designing the message-id. See comments above where the message id is
4318 created. This is Something For The Future.
4319 Do this wait any time we have created a message-id, even if we rejected the
4320 message. This gives unique IDs for logging done by ACLs. */
4322 if (id_resolution != 0)
4324 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
4325 exim_wait_tick(&message_id_tv, id_resolution);
4330 process_info[process_info_len] = 0; /* Remove message id */
4331 if (spool_data_file && cutthrough_done == NOT_TRIED)
4333 if (fclose(spool_data_file)) /* Frees the lock */
4334 log_write(0, LOG_MAIN|LOG_PANIC,
4335 "spoolfile error on close: %s", strerror(errno));
4336 spool_data_file = NULL;
4339 /* Now reset signal handlers to their defaults */
4341 signal(SIGTERM, SIG_DFL);
4342 signal(SIGINT, SIG_DFL);
4344 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4345 value, which defaults TRUE - meaning there may be more incoming messages from
4346 this connection. For non-SMTP callers (where there is only ever one message),
4347 the default is FALSE. */
4353 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4354 is set to the response that should be sent. When it is NULL, we generate
4355 default responses. After an ACL error or local_scan() error, the response has
4356 already been sent, and smtp_reply is an empty string to indicate this. */
4358 if (!smtp_batched_input)
4362 if (fake_response != OK)
4363 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4364 3, TRUE, fake_response_text);
4366 /* An OK response is required; use "message" text if present. */
4370 uschar *code = US"250";
4372 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4373 smtp_respond(code, len, TRUE, user_msg);
4376 /* Default OK response */
4378 else if (chunking_state > CHUNKING_OFFERED)
4380 /* If there is more input waiting, no need to flush (probably the client
4381 pipelined QUIT after data). We check only the in-process buffer, not
4384 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4385 receive_smtp_buffered(),
4386 chunking_datasize, message_size+message_linecount, message_id);
4387 chunking_state = CHUNKING_OFFERED;
4390 smtp_printf("250 OK id=%s\r\n", receive_smtp_buffered(), message_id);
4394 "\n**** SMTP testing: that is not a real message id!\n\n");
4397 /* smtp_reply is set non-empty */
4399 else if (smtp_reply[0] != 0)
4400 if (fake_response != OK && smtp_reply[0] == '2')
4401 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4402 fake_response_text);
4404 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4406 switch (cutthrough_done)
4409 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4411 /* Delete spool files */
4412 Uunlink(spool_name);
4413 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4414 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4418 if (cutthrough.defer_pass)
4420 Uunlink(spool_name);
4421 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4422 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4427 if (cutthrough_done != NOT_TRIED)
4429 if (spool_data_file)
4431 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4432 spool_data_file = NULL;
4434 message_id[0] = 0; /* Prevent a delivery from starting */
4435 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4436 cutthrough.defer_pass = FALSE;
4440 /* For batched SMTP, generate an error message on failure, and do
4441 nothing on success. The function moan_smtp_batch() does not return -
4442 it exits from the program with a non-zero return code. */
4444 else if (smtp_reply)
4445 moan_smtp_batch(NULL, "%s", smtp_reply);
4449 /* If blackholing, we can immediately log this message's sad fate. The data
4450 file has already been unlinked, and the header file was never written to disk.
4451 We must now indicate that nothing was received, to prevent a delivery from
4456 const uschar *detail =
4457 #ifdef HAVE_LOCAL_SCAN
4458 local_scan_data ? string_printing(local_scan_data) :
4460 string_sprintf("(%s discarded recipients)", blackholed_by);
4461 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4462 log_write(0, LOG_MAIN, "Completed");
4466 /* Reset headers so that logging of rejects for a subsequent message doesn't
4467 include them. It is also important to set header_last = NULL before exiting
4468 from this function, as this prevents certain rewrites that might happen during
4469 subsequent verifying (of another incoming message) from trying to add headers
4470 when they shouldn't. */
4472 header_list = header_last = NULL;
4474 return yield; /* TRUE if more messages (SMTP only) */
4477 /* End of receive.c */