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)
1520 uschar * timestamp = expand_string(US"${tod_full}");
1521 header_line * received_header= header_list;
1523 if (recipients_count == 1) received_for = recipients_list[0].address;
1524 received = expand_string(received_header_text);
1525 received_for = NULL;
1529 if(spool_name[0] != 0)
1530 Uunlink(spool_name); /* Lose the data file */
1531 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1532 "(received_header_text) failed: %s", string_printing(received_header_text),
1533 expand_string_message);
1536 /* The first element on the header chain is reserved for the Received header,
1537 so all we have to do is fill in the text pointer, and set the type. However, if
1538 the result of the expansion is an empty string, we leave the header marked as
1539 "old" so as to refrain from adding a Received header. */
1543 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1544 received_header->type = htype_old;
1548 received_header->text = string_sprintf("%s;\n\t%s\n", received, timestamp);
1549 received_header->type = htype_received;
1552 received_header->slen = Ustrlen(received_header->text);
1554 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1555 received_header->type, received_header->text);
1560 /*************************************************
1562 *************************************************/
1564 /* Receive a message on the given input, and put it into a pair of spool files.
1565 Either a non-null list of recipients, or the extract flag will be true, or
1566 both. The flag sender_local is true for locally generated messages. The flag
1567 submission_mode is true if an ACL has obeyed "control = submission". The flag
1568 suppress_local_fixups is true if an ACL has obeyed "control =
1569 suppress_local_fixups" or -G was passed on the command-line.
1570 The flag smtp_input is true if the message is to be
1571 handled using SMTP conventions about termination and lines starting with dots.
1572 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1574 If a message was successfully read, message_id[0] will be non-zero.
1576 The general actions of this function are:
1578 . Read the headers of the message (if any) into a chain of store
1581 . If there is a "sender:" header and the message is locally originated,
1582 throw it away, unless the caller is trusted, or unless
1583 active_local_sender_retain is set - which can only happen if
1584 active_local_from_check is false.
1586 . If recipients are to be extracted from the message, build the
1587 recipients list from the headers, removing any that were on the
1588 original recipients list (unless extract_addresses_remove_arguments is
1589 false), and at the same time, remove any bcc header that may be present.
1591 . Get the spool file for the data, sort out its unique name, open
1592 and lock it (but don't give it the name yet).
1594 . Generate a "Message-Id" header if the message doesn't have one, for
1595 locally-originated messages.
1597 . Generate a "Received" header.
1599 . Ensure the recipients list is fully qualified and rewritten if necessary.
1601 . If there are any rewriting rules, apply them to the sender address
1602 and also to the headers.
1604 . If there is no from: header, generate one, for locally-generated messages
1605 and messages in "submission mode" only.
1607 . If the sender is local, check that from: is correct, and if not, generate
1608 a Sender: header, unless message comes from a trusted caller, or this
1609 feature is disabled by active_local_from_check being false.
1611 . If there is no "date" header, generate one, for locally-originated
1612 or submission mode messages only.
1614 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1615 dot_ends mode, to the data file. Leave it open, to hold the lock.
1617 . Write the envelope and the headers to a new file.
1619 . Set the name for the header file; close it.
1621 . Set the name for the data file; close it.
1623 Because this function can potentially be called many times in a single
1624 SMTP connection, all store should be got by store_get(), so that it will be
1625 automatically retrieved after the message is accepted.
1627 FUDGE: It seems that sites on the net send out messages with just LF
1628 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1629 we make the CRs optional in all cases.
1631 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1632 new regime is now in place in which bare CRs in header lines are turned into LF
1633 followed by a space, so as not to terminate the header line.
1635 February 2004: A bare LF in a header line in a message whose first line was
1636 terminated by CRLF is treated in the same way as a bare CR.
1639 extract_recip TRUE if recipients are to be extracted from the message's
1642 Returns: TRUE there are more messages to be read (SMTP input)
1643 FALSE there are no more messages to be read (non-SMTP input
1644 or SMTP connection collapsed, or other failure)
1646 When reading a message for filter testing, the returned value indicates
1647 whether the headers (which is all that is read) were terminated by '.' or
1651 receive_msg(BOOL extract_recip)
1655 int process_info_len = Ustrlen(process_info);
1656 int error_rc = error_handling == ERRORS_SENDER
1657 ? errors_sender_rc : EXIT_FAILURE;
1658 int header_size = 256;
1659 int start, end, domain;
1660 int id_resolution = 0;
1662 int prevlines_length = 0;
1666 BOOL contains_resent_headers = FALSE;
1667 BOOL extracted_ignored = FALSE;
1668 BOOL first_line_ended_crlf = TRUE_UNSET;
1669 BOOL smtp_yield = TRUE;
1672 BOOL resents_exist = FALSE;
1673 uschar *resent_prefix = US"";
1674 uschar *blackholed_by = NULL;
1675 uschar *blackhole_log_msg = US"";
1676 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1679 error_block *bad_addresses = NULL;
1681 uschar *frozen_by = NULL;
1682 uschar *queued_by = NULL;
1685 rmark rcvd_log_reset_point;
1687 struct stat statbuf;
1689 /* Final message to give to SMTP caller, and messages from ACLs */
1691 uschar *smtp_reply = NULL;
1692 uschar *user_msg, *log_msg;
1694 /* Working header pointers */
1699 /* Flags for noting the existence of certain headers (only one left) */
1701 BOOL date_header_exists = FALSE;
1703 /* Pointers to receive the addresses of headers whose contents we need. */
1705 header_line *from_header = NULL;
1706 header_line *subject_header = NULL;
1707 header_line *msgid_header = NULL;
1708 header_line *received_header;
1709 BOOL msgid_header_newly_created = FALSE;
1711 /* Variables for use when building the Received: header. */
1717 /* Release any open files that might have been cached while preparing to
1718 accept the message - e.g. by verifying addresses - because reading a message
1719 might take a fair bit of real time. */
1723 /* Extracting the recipient list from an input file is incompatible with
1724 cutthrough delivery with the no-spool option. It shouldn't be possible
1725 to set up the combination, but just in case kill any ongoing connection. */
1726 if (extract_recip || !smtp_input)
1727 cancel_cutthrough_connection(TRUE, US"not smtp input");
1729 /* Initialize the chain of headers by setting up a place-holder for Received:
1730 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1731 pointing to the end of the chain to make adding headers simple. */
1733 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1734 header_list->next = NULL;
1735 header_list->type = htype_old;
1736 header_list->text = NULL;
1737 header_list->slen = 0;
1739 /* Control block for the next header to be read. */
1741 reset_point = store_mark();
1742 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1743 next->text = store_get(header_size, TRUE); /* tainted */
1745 /* Initialize message id to be null (indicating no message read), and the
1746 header names list to be the normal list. Indicate there is no data file open
1747 yet, initialize the size and warning count, and deal with no size limit. */
1750 spool_data_file = NULL;
1755 received_count = 1; /* For the one we will add */
1757 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1759 /* While reading the message, the following counts are computed. */
1761 message_linecount = body_linecount = body_zerocount =
1762 max_received_linelength = 0;
1764 #ifdef WITH_CONTENT_SCAN
1765 /* reset non-per-part mime variables */
1766 mime_is_coverletter = 0;
1768 mime_part_count = -1;
1771 #ifndef DISABLE_DKIM
1772 /* Call into DKIM to set up the context. In CHUNKING mode
1773 we clear the dot-stuffing flag */
1774 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1775 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1778 #ifdef SUPPORT_DMARC
1779 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1782 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1783 ids, and fractions of a second are required. See the comments that precede the
1784 message id creation below. */
1786 exim_gettime(&message_id_tv);
1788 /* For other uses of the received time we can operate with granularity of one
1789 second, and for that we use the global variable received_time. This is for
1790 things like ultimate message timeouts. */
1792 received_time = message_id_tv;
1794 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1795 happen in the smtp_getc() function when it refills its buffer. */
1797 had_data_timeout = 0;
1799 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1801 /* If not SMTP input, timeout happens only if configured, and we just set a
1802 single timeout for the whole message. */
1804 else if (receive_timeout > 0)
1806 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1807 ALARM(receive_timeout);
1810 /* SIGTERM and SIGINT are caught always. */
1812 had_data_sigint = 0;
1813 signal(SIGTERM, data_sigterm_sigint_handler);
1814 signal(SIGINT, data_sigterm_sigint_handler);
1816 /* Header lines in messages are not supposed to be very long, though when
1817 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1818 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1819 storing the header, and extend this as necessary using string_cat().
1821 To cope with total lunacies, impose an upper limit on the length of the header
1822 section of the message, as otherwise the store will fill up. We must also cope
1823 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1824 Folded header lines are joined into one string, leaving the '\n' characters
1825 inside them, so that writing them out reproduces the input.
1827 Loop for each character of each header; the next structure for chaining the
1828 header is set up already, with ptr the offset of the next character in
1833 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1835 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1836 SMTP must have a correct "." terminator. */
1838 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1840 smtp_reply = handle_lost_connection(US" (header)");
1842 goto TIDYUP; /* Skip to end of function */
1845 /* See if we are at the current header's size limit - there must be at least
1846 four bytes left. This allows for the new character plus a zero, plus two for
1847 extra insertions when we are playing games with dots and carriage returns. If
1848 we are at the limit, extend the text buffer. This could have been done
1849 automatically using string_cat() but because this is a tightish loop storing
1850 only one character at a time, we choose to do it inline. Normally
1851 store_extend() will be able to extend the block; only at the end of a big
1852 store block will a copy be needed. To handle the case of very long headers
1853 (and sometimes lunatic messages can have ones that are 100s of K long) we
1854 call store_release() for strings that have been copied - if the string is at
1855 the start of a block (and therefore the only thing in it, because we aren't
1856 doing any other gets), the block gets freed. We can only do this release if
1857 there were no allocations since the once that we want to free. */
1859 if (ptr >= header_size - 4)
1861 int oldsize = header_size;
1863 if (header_size >= INT_MAX/2)
1867 /* The data came from the message, so is tainted. */
1869 if (!store_extend(next->text, TRUE, oldsize, header_size))
1870 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1873 /* Cope with receiving a binary zero. There is dispute about whether
1874 these should be allowed in RFC 822 messages. The middle view is that they
1875 should not be allowed in headers, at least. Exim takes this attitude at
1876 the moment. We can't just stomp on them here, because we don't know that
1877 this line is a header yet. Set a flag to cause scanning later. */
1879 if (ch == 0) had_zero++;
1881 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1882 those from data files use just LF. Treat LF in local SMTP input as a
1883 terminator too. Treat EOF as a line terminator always. */
1885 if (ch == EOF) goto EOL;
1887 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1888 other MTAs accept this. We are therefore forced into this "liberalisation"
1889 too, so we accept LF as a line terminator whatever the source of the message.
1890 However, if the first line of the message ended with a CRLF, we treat a bare
1891 LF specially by inserting a white space after it to ensure that the header
1892 line is not terminated. */
1896 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1897 else if (first_line_ended_crlf) receive_ungetc(' ');
1901 /* This is not the end of the line. If this is SMTP input and this is
1902 the first character in the line and it is a "." character, ignore it.
1903 This implements the dot-doubling rule, though header lines starting with
1904 dots aren't exactly common. They are legal in RFC 822, though. If the
1905 following is CRLF or LF, this is the line that that terminates the
1906 entire message. We set message_ended to indicate this has happened (to
1907 prevent further reading), and break out of the loop, having freed the
1908 empty header, and set next = NULL to indicate no data line. */
1910 if (ptr == 0 && ch == '.' && f.dot_ends)
1912 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1915 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1919 ch = '\r'; /* Revert to CR */
1924 message_ended = END_DOT;
1925 reset_point = store_reset(reset_point);
1927 break; /* End character-reading loop */
1930 /* For non-SMTP input, the dot at the start of the line was really a data
1931 character. What is now in ch is the following character. We guaranteed
1932 enough space for this above. */
1936 next->text[ptr++] = '.';
1941 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1942 remember this case if this is the first line ending. */
1946 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1949 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1953 /* Otherwise, put back the character after CR, and turn the bare CR
1956 ch = (receive_ungetc)(ch);
1957 next->text[ptr++] = '\n';
1962 /* We have a data character for the header line. */
1964 next->text[ptr++] = ch; /* Add to buffer */
1965 message_size++; /* Total message size so far */
1967 /* Handle failure due to a humungously long header section. The >= allows
1968 for the terminating \n. Add what we have so far onto the headers list so
1969 that it gets reflected in any error message, and back up the just-read
1972 if (message_size >= header_maxsize)
1975 next->text[ptr] = 0;
1977 next->type = htype_other;
1979 header_last->next = next;
1982 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1983 "%s (more than %d characters): message abandoned",
1984 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1988 smtp_reply = US"552 Message header is ridiculously long";
1989 receive_swallow_smtp();
1990 goto TIDYUP; /* Skip to end of function */
1995 give_local_error(ERRMESS_VLONGHEADER,
1996 string_sprintf("message header longer than %d characters received: "
1997 "message not accepted", header_maxsize), US"", error_rc, stdin,
1999 /* Does not return */
2003 continue; /* With next input character */
2005 /* End of header line reached */
2009 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2011 receive_linecount++;
2012 message_linecount++;
2014 /* Keep track of maximum line length */
2016 if (ptr - prevlines_length > max_received_linelength)
2017 max_received_linelength = ptr - prevlines_length;
2018 prevlines_length = ptr + 1;
2020 /* Now put in the terminating newline. There is always space for
2021 at least two more characters. */
2023 next->text[ptr++] = '\n';
2026 /* A blank line signals the end of the headers; release the unwanted
2027 space and set next to NULL to indicate this. */
2031 reset_point = store_reset(reset_point);
2036 /* There is data in the line; see if the next input character is a
2037 whitespace character. If it is, we have a continuation of this header line.
2038 There is always space for at least one character at this point. */
2042 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2043 if (nextch == ' ' || nextch == '\t')
2045 next->text[ptr++] = nextch;
2046 if (++message_size >= header_maxsize)
2048 continue; /* Iterate the loop */
2050 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2051 else ch = EOF; /* Cause main loop to exit at end */
2054 /* We have got to the real line end. Terminate the string and release store
2055 beyond it. If it turns out to be a real header, internal binary zeros will
2056 be squashed later. */
2058 next->text[ptr] = 0;
2060 store_release_above(next->text + ptr + 1);
2062 /* Check the running total size against the overall message size limit. We
2063 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2064 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2065 headers - the code to read the body will then also hit the buffer. */
2067 if (message_size > thismessage_size_limit) break;
2069 /* A line that is not syntactically correct for a header also marks
2070 the end of the headers. In this case, we leave next containing the
2071 first data line. This might actually be several lines because of the
2072 continuation logic applied above, but that doesn't matter.
2074 It turns out that smail, and presumably sendmail, accept leading lines
2077 From ph10 Fri Jan 5 12:35 GMT 1996
2079 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2080 find any documentation of this, but for compatibility it had better be
2081 accepted. Exim restricts it to the case of non-smtp messages, and
2082 treats it as an alternative to the -f command line option. Thus it is
2083 ignored except for trusted users or filter testing. Otherwise it is taken
2084 as the sender address, unless -f was used (sendmail compatibility).
2086 It further turns out that some UUCPs generate the From_line in a different
2089 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2091 The regex for matching these things is now capable of recognizing both
2092 formats (including 2- and 4-digit years in the latter). In fact, the regex
2093 is now configurable, as is the expansion string to fish out the sender.
2095 Even further on it has been discovered that some broken clients send
2096 these lines in SMTP messages. There is now an option to ignore them from
2097 specified hosts or networks. Sigh. */
2099 if ( header_last == header_list
2101 || ( sender_host_address
2102 && verify_check_host(&ignore_fromline_hosts) == OK
2104 || (!sender_host_address && ignore_fromline_local)
2106 && regex_match_and_setup(regex_From, next->text, 0, -1)
2109 if (!f.sender_address_forced)
2111 uschar *uucp_sender = expand_string(uucp_from_sender);
2113 log_write(0, LOG_MAIN|LOG_PANIC,
2114 "expansion of \"%s\" failed after matching "
2115 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2118 int start, end, domain;
2120 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2121 &start, &end, &domain, TRUE);
2124 if (domain == 0 && newsender[0] != 0)
2125 newsender = rewrite_address_qualify(newsender, FALSE);
2127 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2129 sender_address = newsender;
2131 if (f.trusted_caller || filter_test != FTEST_NONE)
2133 authenticated_sender = NULL;
2134 originator_name = US"";
2135 f.sender_local = FALSE;
2138 if (filter_test != FTEST_NONE)
2139 printf("Sender taken from \"From \" line\n");
2146 /* Not a leading "From " line. Check to see if it is a valid header line.
2147 Header names may contain any non-control characters except space and colon,
2152 uschar *p = next->text;
2154 /* If not a valid header line, break from the header reading loop, leaving
2155 next != NULL, indicating that it holds the first line of the body. */
2157 if (isspace(*p)) break;
2158 while (mac_isgraph(*p) && *p != ':') p++;
2159 while (isspace(*p)) p++;
2162 body_zerocount = had_zero;
2166 /* We have a valid header line. If there were any binary zeroes in
2167 the line, stomp on them here. */
2170 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2173 /* It is perfectly legal to have an empty continuation line
2174 at the end of a header, but it is confusing to humans
2175 looking at such messages, since it looks like a blank line.
2176 Reduce confusion by removing redundant white space at the
2177 end. We know that there is at least one printing character
2178 (the ':' tested for above) so there is no danger of running
2181 p = next->text + ptr - 2;
2184 while (*p == ' ' || *p == '\t') p--;
2185 if (*p != '\n') break;
2186 ptr = (p--) - next->text + 1;
2187 message_size -= next->slen - ptr;
2188 next->text[ptr] = 0;
2192 /* Add the header to the chain */
2194 next->type = htype_other;
2196 header_last->next = next;
2199 /* Check the limit for individual line lengths. This comes after adding to
2200 the chain so that the failing line is reflected if a bounce is generated
2201 (for a local message). */
2203 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2205 log_write(0, LOG_MAIN, "overlong message header line received from "
2206 "%s (more than %d characters): message abandoned",
2207 f.sender_host_unknown ? sender_ident : sender_fullhost,
2208 header_line_maxsize);
2212 smtp_reply = US"552 A message header line is too long";
2213 receive_swallow_smtp();
2214 goto TIDYUP; /* Skip to end of function */
2218 give_local_error(ERRMESS_VLONGHDRLINE,
2219 string_sprintf("message header line longer than %d characters "
2220 "received: message not accepted", header_line_maxsize), US"",
2221 error_rc, stdin, header_list->next);
2222 /* Does not return */
2225 /* Note if any resent- fields exist. */
2227 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2229 resents_exist = TRUE;
2230 resent_prefix = US"Resent-";
2234 /* Reject CHUNKING messages that do not CRLF their first header line */
2236 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2238 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2239 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2241 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2242 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2243 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2246 goto TIDYUP; /* Skip to end of function */
2249 /* The line has been handled. If we have hit EOF, break out of the loop,
2250 indicating no pending data line. */
2252 if (ch == EOF) { next = NULL; break; }
2254 /* Set up for the next header */
2256 reset_point = store_mark();
2258 next = store_get(sizeof(header_line), FALSE);
2259 next->text = store_get(header_size, TRUE);
2262 prevlines_length = 0;
2263 } /* Continue, starting to read the next header */
2265 /* At this point, we have read all the headers into a data structure in main
2266 store. The first header is still the dummy placeholder for the Received: header
2267 we are going to generate a bit later on. If next != NULL, it contains the first
2268 data line - which terminated the headers before reaching a blank line (not the
2273 debug_printf(">>Headers received:\n");
2274 for (header_line * h = header_list->next; h; h = h->next)
2275 debug_printf("%s", h->text);
2279 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2280 is dropped immediately after valid headers, the next thing we will see is EOF.
2281 We must test for this specially, as further down the reading of the data is
2282 skipped if already at EOF. */
2284 if (smtp_input && (receive_feof)())
2286 smtp_reply = handle_lost_connection(US" (after header)");
2288 goto TIDYUP; /* Skip to end of function */
2291 /* If this is a filter test run and no headers were read, output a warning
2292 in case there is a mistake in the test message. */
2294 if (filter_test != FTEST_NONE && header_list->next == NULL)
2295 printf("Warning: no message headers read\n");
2298 /* Scan the headers to identify them. Some are merely marked for later
2299 processing; some are dealt with here. */
2301 for (header_line * h = header_list->next; h; h = h->next)
2303 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2304 if (is_resent) contains_resent_headers = TRUE;
2306 switch (header_checkname(h, is_resent))
2309 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2313 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2316 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2319 if (!resents_exist || is_resent) date_header_exists = TRUE;
2322 /* Same comments as about Return-Path: below. */
2324 case htype_delivery_date:
2325 if (delivery_date_remove) h->type = htype_old;
2328 /* Same comments as about Return-Path: below. */
2330 case htype_envelope_to:
2331 if (envelope_to_remove) h->type = htype_old;
2334 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2335 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2336 header consists of just the login id of the user who called Exim, rewrite
2337 it with the gecos field first. Apply this rule to Resent-From: if there
2338 are resent- fields. */
2341 h->type = htype_from;
2342 if (!resents_exist || is_resent)
2348 uschar *s = Ustrchr(h->text, ':') + 1;
2349 while (isspace(*s)) s++;
2350 len = h->slen - (s - h->text) - 1;
2351 if (Ustrlen(originator_login) == len &&
2352 strncmpic(s, originator_login, len) == 0)
2354 uschar *name = is_resent? US"Resent-From" : US"From";
2355 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2356 originator_login, qualify_domain_sender);
2357 from_header = header_last;
2358 h->type = htype_old;
2359 DEBUG(D_receive|D_rewrite)
2360 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2366 /* Identify the Message-id: header for generating "in-reply-to" in the
2367 autoreply transport. For incoming logging, save any resent- value. In both
2368 cases, take just the first of any multiples. */
2371 if (!msgid_header && (!resents_exist || is_resent))
2378 /* Flag all Received: headers */
2380 case htype_received:
2381 h->type = htype_received;
2385 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2387 case htype_reply_to:
2388 h->type = htype_reply_to;
2391 /* The Return-path: header is supposed to be added to messages when
2392 they leave the SMTP system. We shouldn't receive messages that already
2393 contain Return-path. However, since Exim generates Return-path: on
2394 local delivery, resent messages may well contain it. We therefore
2395 provide an option (which defaults on) to remove any Return-path: headers
2396 on input. Removal actually means flagging as "old", which prevents the
2397 header being transmitted with the message. */
2399 case htype_return_path:
2400 if (return_path_remove) h->type = htype_old;
2402 /* If we are testing a mail filter file, use the value of the
2403 Return-Path: header to set up the return_path variable, which is not
2404 otherwise set. However, remove any <> that surround the address
2405 because the variable doesn't have these. */
2407 if (filter_test != FTEST_NONE)
2409 uschar *start = h->text + 12;
2410 uschar *end = start + Ustrlen(start);
2411 while (isspace(*start)) start++;
2412 while (end > start && isspace(end[-1])) end--;
2413 if (*start == '<' && end[-1] == '>')
2418 return_path = string_copyn(start, end - start);
2419 printf("Return-path taken from \"Return-path:\" header line\n");
2423 /* If there is a "Sender:" header and the message is locally originated,
2424 and from an untrusted caller and suppress_local_fixups is not set, or if we
2425 are in submission mode for a remote message, mark it "old" so that it will
2426 not be transmitted with the message, unless active_local_sender_retain is
2427 set. (This can only be true if active_local_from_check is false.) If there
2428 are any resent- headers in the message, apply this rule to Resent-Sender:
2429 instead of Sender:. Messages with multiple resent- header sets cannot be
2430 tidily handled. (For this reason, at least one MUA - Pine - turns old
2431 resent- headers into X-resent- headers when resending, leaving just one
2435 h->type = !f.active_local_sender_retain
2436 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2437 || f.submission_mode
2439 && (!resents_exist || is_resent)
2440 ? htype_old : htype_sender;
2443 /* Remember the Subject: header for logging. There is no Resent-Subject */
2449 /* "To:" gets flagged, and the existence of a recipient header is noted,
2450 whether it's resent- or not. */
2455 to_or_cc_header_exists = TRUE;
2461 /* Extract recipients from the headers if that is required (the -t option).
2462 Note that this is documented as being done *before* any address rewriting takes
2463 place. There are two possibilities:
2465 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2466 recipients already listed are to be REMOVED from the message. Smail 3 works
2467 like this. We need to build a non-recipients tree for that list, because in
2468 subsequent processing this data is held in a tree and that's what the
2469 spool_write_header() function expects. Make sure that non-recipient addresses
2470 are fully qualified and rewritten if necessary.
2472 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2473 those in the command line arguments (and it is rumoured some other MTAs do
2474 this). Therefore, there is an option to make Exim behave this way.
2476 *** Notes on "Resent-" header lines ***
2478 The presence of resent-headers in the message makes -t horribly ambiguous.
2479 Experiments with sendmail showed that it uses recipients for all resent-
2480 headers, totally ignoring the concept of "sets of resent- headers" as described
2481 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2482 with all the addresses in one instance of each header.
2484 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2485 error for -t if there were resent- headers in the message. However, after a
2486 discussion on the mailing list, I've learned that there are MUAs that use
2487 resent- headers with -t, and also that the stuff about sets of resent- headers
2488 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2489 message with -t and resent- header lines makes sure that only *its* resent-
2490 headers are present; previous ones are often renamed as X-resent- for example.
2492 Consequently, Exim has been changed so that, if any resent- header lines are
2493 present, the recipients are taken from all of the appropriate resent- lines,
2494 and not from the ordinary To:, Cc:, etc. */
2499 error_block **bnext = &bad_addresses;
2501 if (extract_addresses_remove_arguments)
2503 while (recipients_count-- > 0)
2505 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2506 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2507 tree_add_nonrecipient(s);
2509 recipients_list = NULL;
2510 recipients_count = recipients_list_max = 0;
2513 /* Now scan the headers */
2515 for (header_line * h = header_list->next; h; h = h->next)
2517 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2518 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2520 uschar *s = Ustrchr(h->text, ':') + 1;
2521 while (isspace(*s)) s++;
2523 f.parse_allow_group = TRUE; /* Allow address group syntax */
2527 uschar *ss = parse_find_address_end(s, FALSE);
2528 uschar *recipient, *errmess, *pp;
2529 int start, end, domain;
2531 /* Check on maximum */
2533 if (recipients_max > 0 && ++rcount > recipients_max)
2534 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2535 US"message rejected: ", error_rc, stdin, NULL);
2536 /* Does not return */
2538 /* Make a copy of the address, and remove any internal newlines. These
2539 may be present as a result of continuations of the header line. The
2540 white space that follows the newline must not be removed - it is part
2543 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2544 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2549 BOOL b = allow_utf8_domains;
2550 allow_utf8_domains = TRUE;
2552 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2556 if (string_is_utf8(recipient))
2557 message_smtputf8 = TRUE;
2559 allow_utf8_domains = b;
2563 /* Keep a list of all the bad addresses so we can send a single
2564 error message at the end. However, an empty address is not an error;
2565 just ignore it. This can come from an empty group list like
2567 To: Recipients of list:;
2569 If there are no recipients at all, an error will occur later. */
2571 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2573 int len = Ustrlen(s);
2574 error_block *b = store_get(sizeof(error_block), FALSE);
2575 while (len > 0 && isspace(s[len-1])) len--;
2577 b->text1 = string_printing(string_copyn(s, len));
2583 /* If the recipient is already in the nonrecipients tree, it must
2584 have appeared on the command line with the option extract_addresses_
2585 remove_arguments set. Do not add it to the recipients, and keep a note
2586 that this has happened, in order to give a better error if there are
2587 no recipients left. */
2589 else if (recipient != NULL)
2591 if (tree_search(tree_nonrecipients, recipient) == NULL)
2592 receive_add_recipient(recipient, -1);
2594 extracted_ignored = TRUE;
2597 /* Move on past this address */
2599 s = ss + (*ss? 1:0);
2600 while (isspace(*s)) s++;
2601 } /* Next address */
2603 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2604 f.parse_found_group = FALSE;
2606 /* If this was the bcc: header, mark it "old", which means it
2607 will be kept on the spool, but not transmitted as part of the
2610 if (h->type == htype_bcc) h->type = htype_old;
2611 } /* For appropriate header line */
2612 } /* For each header line */
2616 /* Now build the unique message id. This has changed several times over the
2617 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2618 Retaining all the history in the comment has become too unwieldy - read
2619 previous release sources if you want it.
2621 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2622 The first part is the current time, in seconds. The second part is the current
2623 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2624 can hold a number in the range 0-3843. It used to be a computed sequence
2625 number, but is now the fractional component of the current time in units of
2626 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2627 received, Exim ensures that the timer has ticked at the appropriate level
2628 before proceeding, to avoid duplication if the pid happened to be re-used
2629 within the same time period. It seems likely that most messages will take at
2630 least half a millisecond to be received, so no delay will normally be
2631 necessary. At least for some time...
2633 There is a modification when localhost_number is set. Formerly this was allowed
2634 to be as large as 255. Now it is restricted to the range 0-16, and the final
2635 component of the message id becomes (localhost_number * 200) + fractional time
2636 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2638 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2639 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2640 still allows the tttttt field to hold a large enough number to last for some
2641 more decades, and the final two-digit field can hold numbers up to 1295, which
2642 is enough for milliseconds (instead of 1/2000 of a second).
2644 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2645 pid, so it is probably safe because pids have to be positive. The
2646 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2647 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2649 Note that string_base62() returns its data in a static storage block, so it
2650 must be copied before calling string_base62() again. It always returns exactly
2653 There doesn't seem to be anything in the RFC which requires a message id to
2654 start with a letter, but Smail was changed to ensure this. The external form of
2655 the message id (as supplied by string expansion) therefore starts with an
2656 additional leading 'E'. The spool file names do not include this leading
2657 letter and it is not used internally.
2659 NOTE: If ever the format of message ids is changed, the regular expression for
2660 checking that a string is in this format must be updated in a corresponding
2661 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2662 must also be changed to reflect the correct string length. The queue-sort code
2663 needs to know the layout. Then, of course, other programs that rely on the
2664 message id format will need updating too. */
2666 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2667 message_id[6] = '-';
2668 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2670 /* Deal with the case where the host number is set. The value of the number was
2671 checked when it was read, to ensure it isn't too big. The timing granularity is
2672 left in id_resolution so that an appropriate wait can be done after receiving
2673 the message, if necessary (we hope it won't be). */
2675 if (host_number_string)
2677 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2678 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2679 string_base62((long int)(
2680 host_number * (1000000/id_resolution) +
2681 message_id_tv.tv_usec/id_resolution)) + 4);
2684 /* Host number not set: final field is just the fractional time at an
2685 appropriate resolution. */
2689 id_resolution = BASE_62 == 62 ? 500 : 1000;
2690 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2691 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2694 /* Add the current message id onto the current process info string if
2697 (void)string_format(process_info + process_info_len,
2698 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2700 /* If we are using multiple input directories, set up the one for this message
2701 to be the least significant base-62 digit of the time of arrival. Otherwise
2702 ensure that it is an empty string. */
2704 set_subdir_str(message_subdir, message_id, 0);
2706 /* Now that we have the message-id, if there is no message-id: header, generate
2707 one, but only for local (without suppress_local_fixups) or submission mode
2708 messages. This can be user-configured if required, but we had better flatten
2709 any illegal characters therein. */
2712 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2714 uschar *id_text = US"";
2715 uschar *id_domain = primary_hostname;
2718 /* Permit only letters, digits, dots, and hyphens in the domain */
2720 if (message_id_domain)
2722 uschar *new_id_domain = expand_string(message_id_domain);
2725 if (!f.expand_string_forcedfail)
2726 log_write(0, LOG_MAIN|LOG_PANIC,
2727 "expansion of \"%s\" (message_id_header_domain) "
2728 "failed: %s", message_id_domain, expand_string_message);
2730 else if (*new_id_domain)
2732 id_domain = new_id_domain;
2733 for (uschar * p = id_domain; *p; p++)
2734 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2738 /* Permit all characters except controls and RFC 2822 specials in the
2739 additional text part. */
2741 if (message_id_text)
2743 uschar *new_id_text = expand_string(message_id_text);
2746 if (!f.expand_string_forcedfail)
2747 log_write(0, LOG_MAIN|LOG_PANIC,
2748 "expansion of \"%s\" (message_id_header_text) "
2749 "failed: %s", message_id_text, expand_string_message);
2751 else if (*new_id_text)
2753 id_text = new_id_text;
2754 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2758 /* Add the header line.
2759 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2760 appended, to preserve classical expectations of header ordering. */
2762 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2763 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2764 *id_text == 0 ? "" : ".", id_text, id_domain);
2766 /* Arrange for newly-created Message-Id to be logged */
2770 msgid_header_newly_created = TRUE;
2775 /* If we are to log recipients, keep a copy of the raw ones before any possible
2776 rewriting. Must copy the count, because later ACLs and the local_scan()
2777 function may mess with the real recipients. */
2779 if (LOGGING(received_recipients))
2781 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2782 for (int i = 0; i < recipients_count; i++)
2783 raw_recipients[i] = string_copy(recipients_list[i].address);
2784 raw_recipients_count = recipients_count;
2787 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2788 recipients will get here only if the conditions were right (allow_unqualified_
2789 recipient is TRUE). */
2791 for (int i = 0; i < recipients_count; i++)
2792 recipients_list[i].address =
2793 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2794 global_rewrite_rules, rewrite_existflags);
2796 /* If there is no From: header, generate one for local (without
2797 suppress_local_fixups) or submission_mode messages. If there is no sender
2798 address, but the sender is local or this is a local delivery error, use the
2799 originator login. This shouldn't happen for genuine bounces, but might happen
2800 for autoreplies. The addition of From: must be done *before* checking for the
2801 possible addition of a Sender: header, because untrusted_set_sender allows an
2802 untrusted user to set anything in the envelope (which might then get info
2803 From:) but we still want to ensure a valid Sender: if it is required. */
2806 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2808 const uschar * oname = US"";
2810 /* Use the originator_name if this is a locally submitted message and the
2811 caller is not trusted. For trusted callers, use it only if -F was used to
2812 force its value or if we have a non-SMTP message for which -f was not used
2813 to set the sender. */
2815 if (!sender_host_address)
2817 if (!f.trusted_caller || f.sender_name_forced ||
2818 (!smtp_input && !f.sender_address_forced))
2819 oname = originator_name;
2822 /* For non-locally submitted messages, the only time we use the originator
2823 name is when it was forced by the /name= option on control=submission. */
2825 else if (submission_name) oname = submission_name;
2827 /* Envelope sender is empty */
2829 if (!*sender_address)
2831 uschar *fromstart, *fromend;
2833 fromstart = string_sprintf("%sFrom: %s%s",
2834 resent_prefix, oname, *oname ? " <" : "");
2835 fromend = *oname ? US">" : US"";
2837 if (f.sender_local || f.local_error_message)
2838 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2839 local_part_quote(originator_login), qualify_domain_sender,
2842 else if (f.submission_mode && authenticated_id)
2844 if (!submission_domain)
2845 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2846 local_part_quote(authenticated_id), qualify_domain_sender,
2849 else if (!*submission_domain) /* empty => whole address set */
2850 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2854 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2855 local_part_quote(authenticated_id), submission_domain, fromend);
2857 from_header = header_last; /* To get it checked for Sender: */
2861 /* There is a non-null envelope sender. Build the header using the original
2862 sender address, before any rewriting that might have been done while
2867 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2870 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2873 from_header = header_last; /* To get it checked for Sender: */
2878 /* If the sender is local (without suppress_local_fixups), or if we are in
2879 submission mode and there is an authenticated_id, check that an existing From:
2880 is correct, and if not, generate a Sender: header, unless disabled. Any
2881 previously-existing Sender: header was removed above. Note that sender_local,
2882 as well as being TRUE if the caller of exim is not trusted, is also true if a
2883 trusted caller did not supply a -f argument for non-smtp input. To allow
2884 trusted callers to forge From: without supplying -f, we have to test explicitly
2885 here. If the From: header contains more than one address, then the call to
2886 parse_extract_address fails, and a Sender: header is inserted, as required. */
2889 && ( f.active_local_from_check
2890 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2891 || f.submission_mode && authenticated_id
2894 BOOL make_sender = TRUE;
2895 int start, end, domain;
2897 uschar *from_address =
2898 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2899 &start, &end, &domain, FALSE);
2900 uschar *generated_sender_address;
2902 generated_sender_address = f.submission_mode
2903 ? !submission_domain
2904 ? string_sprintf("%s@%s",
2905 local_part_quote(authenticated_id), qualify_domain_sender)
2906 : !*submission_domain /* empty => full address */
2907 ? string_sprintf("%s", authenticated_id)
2908 : string_sprintf("%s@%s",
2909 local_part_quote(authenticated_id), submission_domain)
2910 : string_sprintf("%s@%s",
2911 local_part_quote(originator_login), qualify_domain_sender);
2913 /* Remove permitted prefixes and suffixes from the local part of the From:
2914 address before doing the comparison with the generated sender. */
2919 uschar *at = domain ? from_address + domain - 1 : NULL;
2922 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2923 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2925 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2926 from_address += slen;
2930 if ( strcmpic(generated_sender_address, from_address) == 0
2931 || (!domain && strcmpic(from_address, originator_login) == 0))
2932 make_sender = FALSE;
2935 /* We have to cause the Sender header to be rewritten if there are
2936 appropriate rewriting rules. */
2939 if (f.submission_mode && !submission_name)
2940 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2941 generated_sender_address);
2943 header_add(htype_sender, "%sSender: %s <%s>\n",
2945 f.submission_mode ? submission_name : originator_name,
2946 generated_sender_address);
2948 /* Ensure that a non-null envelope sender address corresponds to the
2949 submission mode sender address. */
2951 if (f.submission_mode && *sender_address)
2953 if (!sender_address_unrewritten)
2954 sender_address_unrewritten = sender_address;
2955 sender_address = generated_sender_address;
2956 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2957 log_write(L_address_rewrite, LOG_MAIN,
2958 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2959 sender_address_unrewritten, generated_sender_address);
2963 /* If there are any rewriting rules, apply them to the sender address, unless
2964 it has already been rewritten as part of verification for SMTP input. */
2966 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2968 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2969 global_rewrite_rules, rewrite_existflags);
2970 DEBUG(D_receive|D_rewrite)
2971 debug_printf("rewritten sender = %s\n", sender_address);
2975 /* The headers must be run through rewrite_header(), because it ensures that
2976 addresses are fully qualified, as well as applying any rewriting rules that may
2979 Qualification of header addresses in a message from a remote host happens only
2980 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2981 appropriate. For local messages, qualification always happens, unless -bnq is
2982 used to explicitly suppress it. No rewriting is done for an unqualified address
2983 that is left untouched.
2985 We start at the second header, skipping our own Received:. This rewriting is
2986 documented as happening *after* recipient addresses are taken from the headers
2987 by the -t command line option. An added Sender: gets rewritten here. */
2989 for (header_line * h = header_list->next; h; h = h->next)
2991 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2992 rewrite_existflags, TRUE);
2997 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2998 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2999 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3000 exists, this applies to the set of resent- headers rather than the normal set.
3002 The requirement for a recipient header has been removed in RFC 2822. At this
3003 point in the code, earlier versions of Exim added a To: header for locally
3004 submitted messages, and an empty Bcc: header for others. In the light of the
3005 changes in RFC 2822, this was dropped in November 2003. */
3008 /* If there is no date header, generate one if the message originates locally
3009 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3010 submission mode flag is set. Messages without Date: are not valid, but it seems
3011 to be more confusing if Exim adds one to all remotely-originated messages.
3012 As per Message-Id, we prepend if resending, else append.
3015 if ( !date_header_exists
3016 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3017 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3018 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3020 search_tidyup(); /* Free any cached resources */
3022 /* Show the complete set of headers if debugging. Note that the first one (the
3023 new Received:) has not yet been set. */
3027 debug_printf(">>Headers after rewriting and local additions:\n");
3028 for (header_line * h = header_list->next; h; h = h->next)
3029 debug_printf("%c %s", h->type, h->text);
3033 /* The headers are now complete in store. If we are running in filter
3034 testing mode, that is all this function does. Return TRUE if the message
3035 ended with a dot. */
3037 if (filter_test != FTEST_NONE)
3039 process_info[process_info_len] = 0;
3040 return message_ended == END_DOT;
3043 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3044 think more if it could be handled. Cannot do onward CHUNKING unless
3045 inbound is, but inbound chunking ought to be ok with outbound plain.
3046 Could we do onward CHUNKING given inbound CHUNKING?
3048 if (chunking_state > CHUNKING_OFFERED)
3049 cancel_cutthrough_connection(FALSE, US"chunking active");
3051 /* Cutthrough delivery:
3052 We have to create the Received header now rather than at the end of reception,
3053 so the timestamp behaviour is a change to the normal case.
3054 Having created it, send the headers to the destination. */
3056 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3058 if (received_count > received_headers_max)
3060 cancel_cutthrough_connection(TRUE, US"too many headers");
3061 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3062 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3063 "Too many \"Received\" headers",
3065 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3066 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3067 message_id[0] = 0; /* Indicate no message accepted */
3068 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3069 goto TIDYUP; /* Skip to end of function */
3071 received_header_gen();
3072 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3073 (void) cutthrough_headers_send();
3077 /* Open a new spool file for the data portion of the message. We need
3078 to access it both via a file descriptor and a stream. Try to make the
3079 directory if it isn't there. */
3081 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3082 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3084 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3086 if (errno == ENOENT)
3088 (void) directory_make(spool_directory,
3089 spool_sname(US"input", message_subdir),
3090 INPUT_DIRECTORY_MODE, TRUE);
3091 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3094 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3095 spool_name, strerror(errno));
3098 /* Make sure the file's group is the Exim gid, and double-check the mode
3099 because the group setting doesn't always get set automatically. */
3101 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3102 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3103 "Failed setting ownership on spool file %s: %s",
3104 spool_name, strerror(errno));
3105 (void)fchmod(data_fd, SPOOL_MODE);
3107 /* We now have data file open. Build a stream for it and lock it. We lock only
3108 the first line of the file (containing the message ID) because otherwise there
3109 are problems when Exim is run under Cygwin (I'm told). See comments in
3110 spool_in.c, where the same locking is done. */
3112 spool_data_file = fdopen(data_fd, "w+");
3113 lock_data.l_type = F_WRLCK;
3114 lock_data.l_whence = SEEK_SET;
3115 lock_data.l_start = 0;
3116 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3118 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3119 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3120 errno, strerror(errno));
3122 /* We have an open, locked data file. Write the message id to it to make it
3123 self-identifying. Then read the remainder of the input of this message and
3124 write it to the data file. If the variable next != NULL, it contains the first
3125 data line (which was read as a header but then turned out not to have the right
3126 format); write it (remembering that it might contain binary zeros). The result
3127 of fwrite() isn't inspected; instead we call ferror() below. */
3129 fprintf(spool_data_file, "%s-D\n", message_id);
3132 uschar *s = next->text;
3133 int len = next->slen;
3134 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3135 body_linecount++; /* Assumes only 1 line */
3138 /* Note that we might already be at end of file, or the logical end of file
3139 (indicated by '.'), or might have encountered an error while writing the
3140 message id or "next" line. */
3142 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3146 message_ended = chunking_state <= CHUNKING_OFFERED
3147 ? read_message_data_smtp(spool_data_file)
3149 ? read_message_bdat_smtp_wire(spool_data_file)
3150 : read_message_bdat_smtp(spool_data_file);
3151 receive_linecount++; /* The terminating "." line */
3154 message_ended = read_message_data(spool_data_file);
3156 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3157 message_linecount += body_linecount;
3159 switch (message_ended)
3161 /* Handle premature termination of SMTP */
3166 Uunlink(spool_name); /* Lose data file when closed */
3167 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3168 message_id[0] = 0; /* Indicate no message accepted */
3169 smtp_reply = handle_lost_connection(US"");
3171 goto TIDYUP; /* Skip to end of function */
3175 /* Handle message that is too big. Don't use host_or_ident() in the log
3176 message; we want to see the ident value even for non-remote messages. */
3179 Uunlink(spool_name); /* Lose the data file when closed */
3180 cancel_cutthrough_connection(TRUE, US"mail too big");
3181 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3183 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3184 "message too big: read=%d max=%d",
3186 sender_fullhost ? " H=" : "",
3187 sender_fullhost ? sender_fullhost : US"",
3188 sender_ident ? " U=" : "",
3189 sender_ident ? sender_ident : US"",
3191 thismessage_size_limit);
3195 smtp_reply = US"552 Message size exceeds maximum permitted";
3196 message_id[0] = 0; /* Indicate no message accepted */
3197 goto TIDYUP; /* Skip to end of function */
3201 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3202 give_local_error(ERRMESS_TOOBIG,
3203 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3204 US"message rejected: ", error_rc, spool_data_file, header_list);
3205 /* Does not return */
3209 /* Handle bad BDAT protocol sequence */
3212 Uunlink(spool_name); /* Lose the data file when closed */
3213 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3214 smtp_reply = US""; /* Response already sent */
3215 message_id[0] = 0; /* Indicate no message accepted */
3216 goto TIDYUP; /* Skip to end of function */
3220 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3221 example, there may be some expansion in an ACL that uses a timer.) */
3223 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3225 /* The message body has now been read into the data file. Call fflush() to
3226 empty the buffers in C, and then call fsync() to get the data written out onto
3227 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3228 having to do this). If there was an I/O error on either input or output,
3229 attempt to send an error message, and unlink the spool file. For non-SMTP input
3230 we can then give up. Note that for SMTP input we must swallow the remainder of
3231 the input in cases of output errors, since the far end doesn't expect to see
3232 anything until the terminating dot line is sent. */
3234 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3235 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3237 uschar *msg_errno = US strerror(errno);
3238 BOOL input_error = (receive_ferror)() != 0;
3239 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3240 input_error? "Input read" : "Spool write",
3242 sender_fullhost ? sender_fullhost : sender_ident);
3244 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3245 Uunlink(spool_name); /* Lose the data file */
3246 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3251 smtp_reply = US"451 Error while reading input data";
3254 smtp_reply = US"451 Error while writing spool file";
3255 receive_swallow_smtp();
3257 message_id[0] = 0; /* Indicate no message accepted */
3258 goto TIDYUP; /* Skip to end of function */
3263 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3264 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3266 /* Does not return */
3271 /* No I/O errors were encountered while writing the data file. */
3273 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3274 gettimeofday(&received_time_complete, NULL);
3277 /* If there were any bad addresses extracted by -t, or there were no recipients
3278 left after -t, send a message to the sender of this message, or write it to
3279 stderr if the error handling option is set that way. Note that there may
3280 legitimately be no recipients for an SMTP message if they have all been removed
3283 We need to rewind the data file in order to read it. In the case of no
3284 recipients or stderr error writing, throw the data file away afterwards, and
3285 exit. (This can't be SMTP, which always ensures there's at least one
3286 syntactically good recipient address.) */
3288 if (extract_recip && (bad_addresses || recipients_count == 0))
3292 if (recipients_count == 0) debug_printf("*** No recipients\n");
3295 debug_printf("*** Bad address(es)\n");
3296 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3297 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3301 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3302 message_id, bad_addresses ? "bad addresses" : "no recipients");
3304 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3306 /* If configured to send errors to the sender, but this fails, force
3307 a failure error code. We use a special one for no recipients so that it
3308 can be detected by the autoreply transport. Otherwise error_rc is set to
3309 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3310 it is EXIT_SUCCESS. */
3312 if (error_handling == ERRORS_SENDER)
3314 if (!moan_to_sender(
3316 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3317 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3318 bad_addresses, header_list, spool_data_file, FALSE
3320 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3325 if (extracted_ignored)
3326 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3328 fprintf(stderr, "exim: no recipients in message\n");
3331 fprintf(stderr, "exim: invalid address%s",
3332 bad_addresses->next ? "es:\n" : ":");
3333 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3334 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3335 bad_addresses->text2);
3339 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3341 Uunlink(spool_name);
3342 (void)fclose(spool_data_file);
3343 exim_exit(error_rc);
3347 /* Data file successfully written. Generate text for the Received: header by
3348 expanding the configured string, and adding a timestamp. By leaving this
3349 operation till now, we ensure that the timestamp is the time that message
3350 reception was completed. However, this is deliberately done before calling the
3351 data ACL and local_scan().
3353 This Received: header may therefore be inspected by the data ACL and by code in
3354 the local_scan() function. When they have run, we update the timestamp to be
3355 the final time of reception.
3357 If there is just one recipient, set up its value in the $received_for variable
3358 for use when we generate the Received: header.
3360 Note: the checking for too many Received: headers is handled by the delivery
3362 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3364 if (!received_header->text) /* Non-cutthrough case */
3366 received_header_gen();
3368 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3370 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3371 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3373 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3374 now, before running the DATA ACL. */
3376 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3379 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3380 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3382 /* If an ACL is specified for checking things at this stage of reception of a
3383 message, run it, unless all the recipients were removed by "discard" in earlier
3384 ACLs. That is the only case in which recipients_count can be zero at this
3385 stage. Set deliver_datafile to point to the data file so that $message_body and
3386 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3389 deliver_datafile = data_fd;
3392 f.enable_dollar_recipients = TRUE;
3394 if (recipients_count == 0)
3395 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3399 /* Handle interactive SMTP messages */
3401 if (smtp_input && !smtp_batched_input)
3404 #ifndef DISABLE_DKIM
3405 if (!f.dkim_disable_verify)
3407 /* Finish verification */
3408 dkim_exim_verify_finish();
3410 /* Check if we must run the DKIM ACL */
3411 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3413 uschar * dkim_verify_signers_expanded =
3414 expand_string(dkim_verify_signers);
3415 gstring * results = NULL;
3419 gstring * seen_items = NULL;
3420 int old_pool = store_pool;
3422 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3424 if (!(ptr = dkim_verify_signers_expanded))
3425 log_write(0, LOG_MAIN|LOG_PANIC,
3426 "expansion of dkim_verify_signers option failed: %s",
3427 expand_string_message);
3429 /* Default to OK when no items are present */
3431 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3433 /* Prevent running ACL for an empty item */
3434 if (!item || !*item) continue;
3436 /* Only run ACL once for each domain or identity,
3437 no matter how often it appears in the expanded list. */
3441 const uschar * seen_items_list = string_from_gstring(seen_items);
3443 BOOL seen_this_item = FALSE;
3445 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3447 if (Ustrcmp(seen_item,item) == 0)
3449 seen_this_item = TRUE;
3456 debug_printf("acl_smtp_dkim: skipping signer %s, "
3457 "already seen\n", item);
3461 seen_items = string_catn(seen_items, US":", 1);
3463 seen_items = string_cat(seen_items, item);
3465 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3469 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3470 "skipping remaining items\n", rc, item);
3471 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3475 dkim_verify_status = string_from_gstring(results);
3476 store_pool = old_pool;
3477 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3480 recipients_count = 0;
3481 blackholed_by = US"DKIM ACL";
3483 blackhole_log_msg = string_sprintf(": %s", log_msg);
3487 Uunlink(spool_name);
3488 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3489 smtp_yield = FALSE; /* No more messages after dropped connection */
3490 smtp_reply = US""; /* Indicate reply already sent */
3491 message_id[0] = 0; /* Indicate no message accepted */
3492 goto TIDYUP; /* Skip to end of function */
3496 dkim_exim_verify_log_all();
3498 #endif /* DISABLE_DKIM */
3500 #ifdef WITH_CONTENT_SCAN
3501 if ( recipients_count > 0
3503 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3506 #endif /* WITH_CONTENT_SCAN */
3508 #ifdef SUPPORT_DMARC
3509 dmarc_store_data(from_header);
3512 #ifndef DISABLE_PRDR
3513 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3516 int all_fail = FAIL;
3518 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3519 /* Loop through recipients, responses must be in same order received */
3520 for (unsigned int c = 0; recipients_count > c; c++)
3522 uschar * addr= recipients_list[c].address;
3523 uschar * msg= US"PRDR R=<%s> %s";
3526 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3527 addr, c+1, recipients_count);
3528 rc = acl_check(ACL_WHERE_PRDR, addr,
3529 acl_smtp_data_prdr, &user_msg, &log_msg);
3531 /* If any recipient rejected content, indicate it in final message */
3533 /* If all recipients rejected, indicate in final message */
3538 case OK: case DISCARD: code = US"250"; break;
3539 case DEFER: code = US"450"; break;
3540 default: code = US"550"; break;
3542 if (user_msg != NULL)
3543 smtp_user_msg(code, user_msg);
3548 case OK: case DISCARD:
3549 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3551 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3553 msg = string_sprintf(CS msg, addr, "refusal"); break;
3555 smtp_user_msg(code, msg);
3557 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3558 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3559 else log_write(0, LOG_MAIN, "%s", CS msg);
3561 if (rc != OK) { receive_remove_recipient(addr); c--; }
3563 /* Set up final message, used if data acl gives OK */
3564 smtp_reply = string_sprintf("%s id=%s message %s",
3565 all_fail == FAIL ? US"550" : US"250",
3568 ? US"rejected for all recipients"
3571 : US"accepted for some recipients");
3572 if (recipients_count == 0)
3574 message_id[0] = 0; /* Indicate no message accepted */
3579 prdr_requested = FALSE;
3580 #endif /* !DISABLE_PRDR */
3582 /* Check the recipients count again, as the MIME ACL might have changed
3585 if (acl_smtp_data != NULL && recipients_count > 0)
3587 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3588 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3591 recipients_count = 0;
3592 blackholed_by = US"DATA ACL";
3594 blackhole_log_msg = string_sprintf(": %s", log_msg);
3595 cancel_cutthrough_connection(TRUE, US"data acl discard");
3599 Uunlink(spool_name);
3600 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3601 #ifdef WITH_CONTENT_SCAN
3604 #ifdef EXPERIMENTAL_DCC
3607 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3608 smtp_yield = FALSE; /* No more messages after dropped connection */
3609 smtp_reply = US""; /* Indicate reply already sent */
3610 message_id[0] = 0; /* Indicate no message accepted */
3611 goto TIDYUP; /* Skip to end of function */
3616 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3617 we cannot take different actions for permanent and temporary rejections. */
3622 #ifdef WITH_CONTENT_SCAN
3623 if ( acl_not_smtp_mime
3624 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3628 #endif /* WITH_CONTENT_SCAN */
3632 uschar *user_msg, *log_msg;
3633 f.authentication_local = TRUE;
3634 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3637 recipients_count = 0;
3638 blackholed_by = US"non-SMTP ACL";
3640 blackhole_log_msg = string_sprintf(": %s", log_msg);
3644 Uunlink(spool_name);
3645 #ifdef WITH_CONTENT_SCAN
3648 #ifdef EXPERIMENTAL_DCC
3651 /* The ACL can specify where rejections are to be logged, possibly
3652 nowhere. The default is main and reject logs. */
3654 if (log_reject_target)
3655 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3656 sender_address, log_msg);
3658 if (!user_msg) user_msg = US"local configuration problem";
3659 if (smtp_batched_input)
3660 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3661 /* Does not return */
3664 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3665 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3666 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3668 /* Does not return */
3671 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3675 /* The applicable ACLs have been run */
3677 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3678 if (f.queue_only_policy) queued_by = US"ACL";
3681 #ifdef WITH_CONTENT_SCAN
3685 #ifdef EXPERIMENTAL_DCC
3690 #ifdef HAVE_LOCAL_SCAN
3691 /* The final check on the message is to run the scan_local() function. The
3692 version supplied with Exim always accepts, but this is a hook for sysadmins to
3693 supply their own checking code. The local_scan() function is run even when all
3694 the recipients have been discarded. */
3696 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3698 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3699 deleted, and the incident gets logged. */
3701 if (sigsetjmp(local_scan_env, 1) == 0)
3703 had_local_scan_crash = 0;
3704 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3705 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3706 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3707 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3709 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3710 local_scan_timeout);
3711 local_scan_data = NULL;
3713 had_local_scan_timeout = 0;
3714 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3715 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3716 rc = local_scan(data_fd, &local_scan_data);
3718 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3720 f.enable_dollar_recipients = FALSE;
3722 store_pool = POOL_MAIN; /* In case changed */
3723 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3726 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3727 os_non_restarting_signal(SIGFPE, SIG_DFL);
3728 os_non_restarting_signal(SIGILL, SIG_DFL);
3729 os_non_restarting_signal(SIGBUS, SIG_DFL);
3733 if (had_local_scan_crash)
3735 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3736 "signal %d - message temporarily rejected (size %d)",
3737 had_local_scan_crash, message_size);
3738 receive_bomb_out(US"local-scan-error", US"local verification problem");
3739 /* Does not return */
3741 if (had_local_scan_timeout)
3743 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3744 "message temporarily rejected (size %d)", message_size);
3745 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3746 /* Does not return */
3750 /* The length check is paranoia against some runaway code, and also because
3751 (for a success return) lines in the spool file are read into big_buffer. */
3753 if (local_scan_data)
3755 int len = Ustrlen(local_scan_data);
3756 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3757 local_scan_data = string_copyn(local_scan_data, len);
3760 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3762 if (!f.deliver_freeze) /* ACL might have already frozen */
3764 f.deliver_freeze = TRUE;
3765 deliver_frozen_at = time(NULL);
3766 frozen_by = US"local_scan()";
3768 rc = LOCAL_SCAN_ACCEPT;
3770 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3772 if (!f.queue_only_policy) /* ACL might have already queued */
3774 f.queue_only_policy = TRUE;
3775 queued_by = US"local_scan()";
3777 rc = LOCAL_SCAN_ACCEPT;
3780 /* Message accepted: remove newlines in local_scan_data because otherwise
3781 the spool file gets corrupted. Ensure that all recipients are qualified. */
3783 if (rc == LOCAL_SCAN_ACCEPT)
3785 if (local_scan_data)
3786 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3787 for (int i = 0; i < recipients_count; i++)
3789 recipient_item *r = recipients_list + i;
3790 r->address = rewrite_address_qualify(r->address, TRUE);
3792 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3794 if (recipients_count == 0 && !blackholed_by)
3795 blackholed_by = US"local_scan";
3798 /* Message rejected: newlines permitted in local_scan_data to generate
3799 multiline SMTP responses. */
3803 uschar *istemp = US"";
3807 errmsg = local_scan_data;
3809 Uunlink(spool_name); /* Cancel this message */
3813 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3814 "rejection given", rc);
3817 case LOCAL_SCAN_REJECT_NOLOGHDR:
3818 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3821 case LOCAL_SCAN_REJECT:
3822 smtp_code = US"550";
3823 if (!errmsg) errmsg = US"Administrative prohibition";
3826 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3827 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3830 case LOCAL_SCAN_TEMPREJECT:
3832 smtp_code = US"451";
3833 if (!errmsg) errmsg = US"Temporary local problem";
3834 istemp = US"temporarily ";
3838 g = string_append(NULL, 2, US"F=",
3839 sender_address[0] == 0 ? US"<>" : sender_address);
3840 g = add_host_info_for_log(g);
3842 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3843 string_from_gstring(g), istemp, string_printing(errmsg));
3846 if (!smtp_batched_input)
3848 smtp_respond(smtp_code, 3, TRUE, errmsg);
3849 message_id[0] = 0; /* Indicate no message accepted */
3850 smtp_reply = US""; /* Indicate reply already sent */
3851 goto TIDYUP; /* Skip to end of function */
3854 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3855 /* Does not return */
3858 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3859 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3860 US"message rejected by local scan code: ", error_rc, spool_data_file,
3862 /* Does not return */
3866 /* Reset signal handlers to ignore signals that previously would have caused
3867 the message to be abandoned. */
3869 signal(SIGTERM, SIG_IGN);
3870 signal(SIGINT, SIG_IGN);
3871 #endif /* HAVE_LOCAL_SCAN */
3874 /* Ensure the first time flag is set in the newly-received message. */
3876 f.deliver_firsttime = TRUE;
3878 #ifdef EXPERIMENTAL_BRIGHTMAIL
3880 { /* rewind data file */
3881 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3882 bmi_verdicts = bmi_process_message(header_list, data_fd);
3886 /* Update the timestamp in our Received: header to account for any time taken by
3887 an ACL or by local_scan(). The new time is the time that all reception
3888 processing is complete. */
3890 timestamp = expand_string(US"${tod_full}");
3891 tslen = Ustrlen(timestamp);
3893 memcpy(received_header->text + received_header->slen - tslen - 1,
3896 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3900 f.deliver_freeze = FALSE;
3901 f.queue_only_policy = FALSE;
3904 /* Keep the data file open until we have written the header file, in order to
3905 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3906 don't write the header file, and we unlink the data file. If writing the header
3907 file fails, we have failed to accept this message. */
3909 if (host_checking || blackholed_by)
3911 Uunlink(spool_name);
3912 msg_size = 0; /* Compute size for log line */
3913 for (header_line * h = header_list; h; h = h->next)
3914 if (h->type != '*') msg_size += h->slen;
3917 /* Write the -H file */
3920 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3922 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3923 Uunlink(spool_name); /* Lose the data file */
3927 smtp_reply = US"451 Error in writing spool file";
3928 message_id[0] = 0; /* Indicate no message accepted */
3933 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3934 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3936 /* Does not return */
3941 /* The message has now been successfully received. */
3943 receive_messagecount++;
3945 /* Add data size to written header size. We do not count the initial file name
3946 that is in the file, but we do add one extra for the notional blank line that
3947 precedes the data. This total differs from message_size in that it include the
3948 added Received: header and any other headers that got created locally. */
3950 if (fflush(spool_data_file))
3952 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3953 log_write(0, LOG_MAIN, "%s\n", errmsg);
3954 Uunlink(spool_name); /* Lose the data file */
3958 smtp_reply = US"451 Error in writing spool file";
3959 message_id[0] = 0; /* Indicate no message accepted */
3964 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3965 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3967 /* Does not return */
3970 fstat(data_fd, &statbuf);
3972 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3974 /* Generate a "message received" log entry. We do this by building up a dynamic
3975 string as required. We log the arrival of a new message while the
3976 file is still locked, just in case the machine is *really* fast, and delivers
3977 it first! Include any message id that is in the message - since the syntax of a
3978 message id is actually an addr-spec, we can use the parse routine to canonicalize
3981 rcvd_log_reset_point = store_mark();
3982 g = string_get(256);
3984 g = string_append(g, 2,
3985 fake_response == FAIL ? US"(= " : US"<= ",
3986 sender_address[0] == 0 ? US"<>" : sender_address);
3987 if (message_reference)
3988 g = string_append(g, 2, US" R=", message_reference);
3990 g = add_host_info_for_log(g);
3993 if (LOGGING(tls_cipher) && tls_in.cipher)
3995 g = string_append(g, 2, US" X=", tls_in.cipher);
3996 # ifndef DISABLE_TLS_RESUME
3997 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
3998 g = string_catn(g, US"*", 1);
4001 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4002 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4003 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4004 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4005 if (LOGGING(tls_sni) && tls_in.sni)
4006 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4009 if (sender_host_authenticated)
4011 g = string_append(g, 2, US" A=", sender_host_authenticated);
4012 if (authenticated_id)
4014 g = string_append(g, 2, US":", authenticated_id);
4015 if (LOGGING(smtp_mailauth) && authenticated_sender)
4016 g = string_append(g, 2, US":", authenticated_sender);
4020 #ifndef DISABLE_PRDR
4022 g = string_catn(g, US" PRDR", 5);
4025 #ifdef SUPPORT_PROXY
4026 if (proxy_session && LOGGING(proxy))
4027 g = string_append(g, 2, US" PRX=", proxy_local_address);
4030 if (chunking_state > CHUNKING_OFFERED)
4031 g = string_catn(g, US" K", 2);
4033 g = string_fmt_append(g, " S=%d", msg_size);
4035 /* log 8BITMIME mode announced in MAIL_FROM
4039 if (LOGGING(8bitmime))
4040 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4042 #ifndef DISABLE_DKIM
4043 if (LOGGING(dkim) && dkim_verify_overall)
4044 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4045 # ifdef EXPERIMENTAL_ARC
4046 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4047 g = string_catn(g, US" ARC", 4);
4051 if (LOGGING(receive_time))
4053 struct timeval diff = received_time_complete;
4054 timediff(&diff, &received_time);
4055 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4059 g = string_append(g, 2, US" Q=", queue_name);
4061 /* If an addr-spec in a message-id contains a quoted string, it can contain
4062 any characters except " \ and CR and so in particular it can contain NL!
4063 Therefore, make sure we use a printing-characters only version for the log.
4064 Also, allow for domain literals in the message id. */
4066 if ( LOGGING(msg_id) && msgid_header
4067 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4071 BOOL save_allow_domain_literals = allow_domain_literals;
4072 allow_domain_literals = TRUE;
4073 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4074 &errmsg, &start, &end, &domain, FALSE);
4075 allow_domain_literals = save_allow_domain_literals;
4077 g = string_append(g, 2,
4078 msgid_header_newly_created ? US" id*=" : US" id=",
4079 string_printing(old_id));
4082 /* If subject logging is turned on, create suitable printing-character
4083 text. By expanding $h_subject: we make use of the MIME decoding. */
4085 if (LOGGING(subject) && subject_header)
4087 uschar *p = big_buffer;
4088 uschar *ss = expand_string(US"$h_subject:");
4090 /* Backslash-quote any double quotes or backslashes so as to make a
4091 a C-like string, and turn any non-printers into escape sequences. */
4094 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4096 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4101 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4104 /* Terminate the string: string_cat() and string_append() leave room, but do
4105 not put the zero in. */
4107 (void) string_from_gstring(g);
4109 /* Create a message log file if message logs are being used and this message is
4110 not blackholed. Write the reception stuff to it. We used to leave message log
4111 creation until the first delivery, but this has proved confusing for some
4114 if (message_logs && !blackholed_by)
4117 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4119 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4123 (void)directory_make(spool_directory,
4124 spool_sname(US"msglog", message_subdir),
4125 MSGLOG_DIRECTORY_MODE, TRUE);
4126 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4130 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4131 m_name, strerror(errno));
4134 FILE *message_log = fdopen(fd, "a");
4137 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4138 m_name, strerror(errno));
4143 uschar *now = tod_stamp(tod_log);
4144 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4145 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4147 if (f.queue_only_policy) fprintf(message_log,
4148 "%s no immediate delivery: queued%s%s by %s\n", now,
4149 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4151 (void)fclose(message_log);
4156 /* Everything has now been done for a successful message except logging its
4157 arrival, and outputting an SMTP response. While writing to the log, set a flag
4158 to cause a call to receive_bomb_out() if the log cannot be opened. */
4160 f.receive_call_bombout = TRUE;
4162 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4163 connection has gone away. This can only be done if there is no unconsumed input
4164 waiting in the local input buffer. We can test for this by calling
4165 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4166 input to be sent following the final dot, so the presence of following input is
4169 If the connection is still present, but there is no unread input for the
4170 socket, the result of a select() call will be zero. If, however, the connection
4171 has gone away, or if there is pending input, the result of select() will be
4172 non-zero. The two cases can be distinguished by trying to read the next input
4173 character. If we succeed, we can unread it so that it remains in the local
4174 buffer for handling later. If not, the connection has been lost.
4176 Of course, since TCP/IP is asynchronous, there is always a chance that the
4177 connection will vanish between the time of this test and the sending of the
4178 response, but the chance of this happening should be small. */
4180 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4181 !receive_smtp_buffered())
4183 struct timeval tv = {.tv_sec = 0, .tv_usec = 0};
4184 fd_set select_check;
4185 FD_ZERO(&select_check);
4186 FD_SET(fileno(smtp_in), &select_check);
4188 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4190 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4191 if (c != EOF) (receive_ungetc)(c); else
4193 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4194 smtp_reply = US""; /* No attempt to send a response */
4195 smtp_yield = FALSE; /* Nothing more on this connection */
4197 /* Re-use the log line workspace */
4200 g = string_cat(g, US"SMTP connection lost after final dot");
4201 g = add_host_info_for_log(g);
4202 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4204 /* Delete the files for this aborted message. */
4206 Uunlink(spool_name);
4207 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4208 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4215 /* The connection has not gone away; we really are going to take responsibility
4216 for this message. */
4218 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4221 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4222 the sender's dot (below).
4223 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4224 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4225 in which case pass temp-reject back to initiator and dump the files.
4227 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4229 XXX We do not handle queue-only, freezing, or blackholes.
4231 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4233 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4234 /* Logging was done in finaldot() */
4237 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4238 cutthrough_done = ACCEPTED;
4239 break; /* message_id needed for SMTP accept below */
4241 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4242 ... for which, pass back the exact error */
4243 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4244 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4245 break; /* message_id needed for SMTP accept below */
4247 default: /* Unknown response, or error. Treat as temp-reject. */
4248 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4249 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4250 break; /* message_id needed for SMTP accept below */
4252 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4253 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4254 cutthrough_done = PERM_REJ;
4259 #ifndef DISABLE_PRDR
4260 if(!smtp_reply || prdr_requested)
4265 log_write(0, LOG_MAIN |
4266 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4267 (LOGGING(received_sender) ? LOG_SENDER : 0),
4270 /* Log any control actions taken by an ACL or local_scan(). */
4272 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4273 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4274 "no immediate delivery: queued%s%s by %s",
4275 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4278 f.receive_call_bombout = FALSE;
4280 /* The store for the main log message can be reused */
4281 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4283 /* If the message is frozen, and freeze_tell is set, do the telling. */
4285 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4286 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4287 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4288 message_id, frozen_by, sender_address);
4291 /* Either a message has been successfully received and written to the two spool
4292 files, or an error in writing the spool has occurred for an SMTP message, or
4293 an SMTP message has been rejected for policy reasons, or a message was passed on
4294 by cutthrough delivery. (For a non-SMTP message we will have already given up
4295 because there's no point in carrying on!) For non-cutthrough we must now close
4296 (and thereby unlock) the data file. In the successful case, this leaves the
4297 message on the spool, ready for delivery. In the error case, the spool file will
4298 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4301 For cutthrough we hold the data file locked until we have deleted it, otherwise
4302 a queue-runner could grab it in the window.
4304 A fflush() was done earlier in the expectation that any write errors on the
4305 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4306 possible for fclose() to fail - but what to do? What has happened to the lock
4307 if this happens? We can at least log it; if it is observed on some platform
4308 then we can think about properly declaring the message not-received. */
4312 /* In SMTP sessions we may receive several messages in one connection. After
4313 each one, we wait for the clock to tick at the level of message-id granularity.
4314 This is so that the combination of time+pid is unique, even on systems where the
4315 pid can be re-used within our time interval. We can't shorten the interval
4316 without re-designing the message-id. See comments above where the message id is
4317 created. This is Something For The Future.
4318 Do this wait any time we have created a message-id, even if we rejected the
4319 message. This gives unique IDs for logging done by ACLs. */
4321 if (id_resolution != 0)
4323 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
4324 exim_wait_tick(&message_id_tv, id_resolution);
4329 process_info[process_info_len] = 0; /* Remove message id */
4330 if (spool_data_file && cutthrough_done == NOT_TRIED)
4332 if (fclose(spool_data_file)) /* Frees the lock */
4333 log_write(0, LOG_MAIN|LOG_PANIC,
4334 "spoolfile error on close: %s", strerror(errno));
4335 spool_data_file = NULL;
4338 /* Now reset signal handlers to their defaults */
4340 signal(SIGTERM, SIG_DFL);
4341 signal(SIGINT, SIG_DFL);
4343 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4344 value, which defaults TRUE - meaning there may be more incoming messages from
4345 this connection. For non-SMTP callers (where there is only ever one message),
4346 the default is FALSE. */
4352 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4353 is set to the response that should be sent. When it is NULL, we generate
4354 default responses. After an ACL error or local_scan() error, the response has
4355 already been sent, and smtp_reply is an empty string to indicate this. */
4357 if (!smtp_batched_input)
4361 if (fake_response != OK)
4362 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4363 3, TRUE, fake_response_text);
4365 /* An OK response is required; use "message" text if present. */
4369 uschar *code = US"250";
4371 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4372 smtp_respond(code, len, TRUE, user_msg);
4375 /* Default OK response */
4377 else if (chunking_state > CHUNKING_OFFERED)
4379 /* If there is more input waiting, no need to flush (probably the client
4380 pipelined QUIT after data). We check only the in-process buffer, not
4383 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4384 receive_smtp_buffered(),
4385 chunking_datasize, message_size+message_linecount, message_id);
4386 chunking_state = CHUNKING_OFFERED;
4389 smtp_printf("250 OK id=%s\r\n", receive_smtp_buffered(), message_id);
4393 "\n**** SMTP testing: that is not a real message id!\n\n");
4396 /* smtp_reply is set non-empty */
4398 else if (smtp_reply[0] != 0)
4399 if (fake_response != OK && smtp_reply[0] == '2')
4400 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4401 fake_response_text);
4403 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4405 switch (cutthrough_done)
4408 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4410 /* Delete spool files */
4411 Uunlink(spool_name);
4412 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4413 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4417 if (cutthrough.defer_pass)
4419 Uunlink(spool_name);
4420 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4421 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4426 if (cutthrough_done != NOT_TRIED)
4428 if (spool_data_file)
4430 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4431 spool_data_file = NULL;
4433 message_id[0] = 0; /* Prevent a delivery from starting */
4434 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4435 cutthrough.defer_pass = FALSE;
4439 /* For batched SMTP, generate an error message on failure, and do
4440 nothing on success. The function moan_smtp_batch() does not return -
4441 it exits from the program with a non-zero return code. */
4443 else if (smtp_reply)
4444 moan_smtp_batch(NULL, "%s", smtp_reply);
4448 /* If blackholing, we can immediately log this message's sad fate. The data
4449 file has already been unlinked, and the header file was never written to disk.
4450 We must now indicate that nothing was received, to prevent a delivery from
4455 const uschar *detail =
4456 #ifdef HAVE_LOCAL_SCAN
4457 local_scan_data ? string_printing(local_scan_data) :
4459 string_sprintf("(%s discarded recipients)", blackholed_by);
4460 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4461 log_write(0, LOG_MAIN, "Completed");
4465 /* Reset headers so that logging of rejects for a subsequent message doesn't
4466 include them. It is also important to set header_last = NULL before exiting
4467 from this function, as this prevents certain rewrites that might happen during
4468 subsequent verifying (of another incoming message) from trying to add headers
4469 when they shouldn't. */
4471 header_list = header_last = NULL;
4473 return yield; /* TRUE if more messages (SMTP only) */
4476 /* End of receive.c */