1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
12 #ifdef EXPERIMENTAL_DCC
16 #ifdef EXPERIMENTAL_DMARC
18 #endif /* EXPERIMENTAL_DMARC */
20 /*************************************************
21 * Local static variables *
22 *************************************************/
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
31 /*************************************************
32 * Non-SMTP character reading functions *
33 *************************************************/
35 /* These are the default functions that are set up in the variables such as
36 receive_getc initially. They just call the standard functions, passing stdin as
37 the file. (When SMTP input is occurring, different functions are used by
38 changing the pointer variables.) */
41 stdin_getc(unsigned lim)
49 return ungetc(c, stdin);
67 /*************************************************
68 * Check that a set sender is allowed *
69 *************************************************/
71 /* This function is called when a local caller sets an explicit sender address.
72 It checks whether this is permitted, which it is for trusted callers.
73 Otherwise, it must match the pattern(s) in untrusted_set_sender.
75 Arguments: the proposed sender address
76 Returns: TRUE for a trusted caller
77 TRUE if the address has been set, untrusted_set_sender has been
78 set, and the address matches something in the list
83 receive_check_set_sender(uschar *newsender)
86 if (trusted_caller) return TRUE;
87 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
88 qnewsender = (Ustrchr(newsender, '@') != NULL)?
89 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
91 match_address_list(qnewsender, TRUE, TRUE, CUSS &untrusted_set_sender, NULL, -1,
98 /*************************************************
99 * Read space info for a partition *
100 *************************************************/
102 /* This function is called by receive_check_fs() below, and also by string
103 expansion for variables such as $spool_space. The field names for the statvfs
104 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
105 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
106 have inodes, and they return -1 for the number available.
108 Later: It turns out that some file systems that do not have the concept of
109 inodes return 0 rather than -1. Such systems should also return 0 for the total
110 number of inodes, so we require that to be greater than zero before returning
114 isspool TRUE for spool partition, FALSE for log partition
115 inodeptr address of int to receive inode count; -1 if there isn't one
117 Returns: available on-root space, in kilobytes
118 -1 for log partition if there isn't one
120 All values are -1 if the STATFS functions are not available.
124 receive_statvfs(BOOL isspool, int *inodeptr)
127 struct STATVFS statbuf;
133 /* The spool directory must always exist. */
137 path = spool_directory;
141 /* Need to cut down the log file path to the directory, and to ignore any
142 appearance of "syslog" in it. */
146 int sep = ':'; /* Not variable - outside scripts use */
147 const uschar *p = log_file_path;
150 /* An empty log_file_path means "use the default". This is the same as an
151 empty item in a list. */
153 if (*p == 0) p = US":";
154 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
155 if (Ustrcmp(path, "syslog") != 0)
158 if (path == NULL) /* No log files */
164 /* An empty string means use the default, which is in the spool directory.
165 But don't just use the spool directory, as it is possible that the log
166 subdirectory has been symbolically linked elsewhere. */
170 sprintf(CS buffer, CS"%s/log", CS spool_directory);
176 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
180 /* We now have the path; do the business */
182 memset(&statbuf, 0, sizeof(statbuf));
184 if (STATVFS(CS path, &statbuf) != 0)
185 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
186 { /* Can happen on first run after installation */
192 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
193 "%s directory %s: %s", name, path, strerror(errno));
194 smtp_closedown(US"spool or log directory problem");
195 exim_exit(EXIT_FAILURE);
198 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
200 /* Disks are getting huge. Take care with computing the size in kilobytes. */
202 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
205 /* Unable to find partition sizes in this environment. */
215 /*************************************************
216 * Check space on spool and log partitions *
217 *************************************************/
219 /* This function is called before accepting a message; if any thresholds are
220 set, it checks them. If a message_size is supplied, it checks that there is
221 enough space for that size plus the threshold - i.e. that the message won't
222 reduce the space to the threshold. Not all OS have statvfs(); for those that
223 don't, this function always returns TRUE. For some OS the old function and
224 struct name statfs is used; that is handled by a macro, defined in exim.h.
227 msg_size the (estimated) size of an incoming message
229 Returns: FALSE if there isn't enough space, or if the information cannot
231 TRUE if no check was done or there is enough space
235 receive_check_fs(int msg_size)
239 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
241 space = receive_statvfs(TRUE, &inodes);
244 debug_printf("spool directory space = %dK inodes = %d "
245 "check_space = %dK inodes = %d msg_size = %d\n",
246 space, inodes, check_spool_space, check_spool_inodes, msg_size);
248 if ((space >= 0 && space < check_spool_space) ||
249 (inodes >= 0 && inodes < check_spool_inodes))
251 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
252 "inodes=%d", space, inodes);
257 if (check_log_space > 0 || check_log_inodes > 0)
259 space = receive_statvfs(FALSE, &inodes);
262 debug_printf("log directory space = %dK inodes = %d "
263 "check_space = %dK inodes = %d\n",
264 space, inodes, check_log_space, check_log_inodes);
266 if ((space >= 0 && space < check_log_space) ||
267 (inodes >= 0 && inodes < check_log_inodes))
269 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
270 "inodes=%d", space, inodes);
280 /*************************************************
281 * Bomb out while reading a message *
282 *************************************************/
284 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
285 received, or if there is a timeout. A rarer case might be if the log files are
286 screwed up and Exim can't open them to record a message's arrival. Handling
287 that case is done by setting a flag to cause the log functions to call this
288 function if there is an ultimate disaster. That is why it is globally
292 reason text reason to pass to the not-quit ACL
293 msg default SMTP response to give if in an SMTP session
298 receive_bomb_out(uschar *reason, uschar *msg)
300 static BOOL already_bombing_out;
301 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
302 timeouts, if someone has something slow in their quit ACL. Since the only
303 things we should be doing are to close down cleanly ASAP, on the second
304 pass we also close down stuff that might be opened again, before bypassing
305 the ACL call and exiting. */
307 /* If spool_name is set, it contains the name of the data file that is being
308 written. Unlink it before closing so that it cannot be picked up by a delivery
309 process. Ensure that any header file is also removed. */
311 if (spool_name[0] != '\0')
314 spool_name[Ustrlen(spool_name) - 1] = 'H';
316 spool_name[0] = '\0';
319 /* Now close the file if it is open, either as a fd or a stream. */
321 if (data_file != NULL)
323 (void)fclose(data_file);
325 } else if (data_fd >= 0) {
326 (void)close(data_fd);
330 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
331 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
334 if (!already_bombing_out)
336 already_bombing_out = TRUE;
339 if (smtp_batched_input)
340 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
341 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
342 smtp_active_hostname, msg);
346 /* Exit from the program (non-BSMTP cases) */
348 exim_exit(EXIT_FAILURE);
352 /*************************************************
353 * Data read timeout *
354 *************************************************/
356 /* Handler function for timeouts that occur while reading the data that
359 Argument: the signal number
364 data_timeout_handler(int sig)
368 sig = sig; /* Keep picky compilers happy */
372 msg = US"SMTP incoming data timeout";
373 log_write(L_lost_incoming_connection,
374 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
376 (sender_fullhost != NULL)? sender_fullhost : US"local process",
381 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
382 log_write(L_lost_incoming_connection,
383 LOG_MAIN, "timed out while reading local message");
386 receive_bomb_out(US"data-timeout", msg); /* Does not return */
391 /*************************************************
392 * local_scan() timeout *
393 *************************************************/
395 /* Handler function for timeouts that occur while running a local_scan()
398 Argument: the signal number
403 local_scan_timeout_handler(int sig)
405 sig = sig; /* Keep picky compilers happy */
406 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
407 "message temporarily rejected (size %d)", message_size);
408 /* Does not return */
409 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
414 /*************************************************
415 * local_scan() crashed *
416 *************************************************/
418 /* Handler function for signals that occur while running a local_scan()
421 Argument: the signal number
426 local_scan_crash_handler(int sig)
428 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
429 "signal %d - message temporarily rejected (size %d)", sig, message_size);
430 /* Does not return */
431 receive_bomb_out(US"local-scan-error", US"local verification problem");
435 /*************************************************
436 * SIGTERM or SIGINT received *
437 *************************************************/
439 /* Handler for SIGTERM or SIGINT signals that occur while reading the
440 data that comprises a message.
442 Argument: the signal number
447 data_sigterm_sigint_handler(int sig)
453 msg = US"Service not available - SIGTERM or SIGINT received";
454 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
455 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
459 if (filter_test == FTEST_NONE)
461 fprintf(stderr, "\nexim: %s received - message abandoned\n",
462 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
463 log_write(0, LOG_MAIN, "%s received while reading local message",
464 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
468 receive_bomb_out(US"signal-exit", msg); /* Does not return */
473 /*************************************************
474 * Add new recipient to list *
475 *************************************************/
477 /* This function builds a list of recipient addresses in argc/argv
481 recipient the next address to add to recipients_list
482 pno parent number for fixed aliases; -1 otherwise
488 receive_add_recipient(uschar *recipient, int pno)
490 if (recipients_count >= recipients_list_max)
492 recipient_item *oldlist = recipients_list;
493 int oldmax = recipients_list_max;
494 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
495 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
497 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
500 recipients_list[recipients_count].address = recipient;
501 recipients_list[recipients_count].pno = pno;
502 #ifdef EXPERIMENTAL_BRIGHTMAIL
503 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
504 /* reset optin string pointer for next recipient */
505 bmi_current_optin = NULL;
507 recipients_list[recipients_count].orcpt = NULL;
508 recipients_list[recipients_count].dsn_flags = 0;
509 recipients_list[recipients_count++].errors_to = NULL;
515 /*************************************************
516 * Send user response message *
517 *************************************************/
519 /* This function is passed a default response code and a user message. It calls
520 smtp_message_code() to check and possibly modify the response code, and then
521 calls smtp_respond() to transmit the response. I put this into a function
522 just to avoid a lot of repetition.
525 code the response code
526 user_msg the user message
533 smtp_user_msg(uschar *code, uschar *user_msg)
536 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
537 smtp_respond(code, len, TRUE, user_msg);
545 /*************************************************
546 * Remove a recipient from the list *
547 *************************************************/
549 /* This function is provided for local_scan() to use.
552 recipient address to remove
554 Returns: TRUE if it did remove something; FALSE otherwise
558 receive_remove_recipient(uschar *recipient)
561 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
563 for (count = 0; count < recipients_count; count++)
565 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
567 if ((--recipients_count - count) > 0)
568 memmove(recipients_list + count, recipients_list + count + 1,
569 (recipients_count - count)*sizeof(recipient_item));
580 /*************************************************
581 * Read data portion of a non-SMTP message *
582 *************************************************/
584 /* This function is called to read the remainder of a message (following the
585 header) when the input is not from SMTP - we are receiving a local message on
586 a standard input stream. The message is always terminated by EOF, and is also
587 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
588 two cases for maximum efficiency.
590 Ensure that the body ends with a newline. This will naturally be the case when
591 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
592 as "sequences of lines" - this of course strictly applies only to SMTP, but
593 deliveries into BSD-type mailbox files also require it. Exim used to have a
594 flag for doing this at delivery time, but as it was always set for all
595 transports, I decided to simplify things by putting the check here instead.
597 There is at least one MUA (dtmail) that sends CRLF via this interface, and
598 other programs are known to do this as well. Exim used to have a option for
599 dealing with this: in July 2003, after much discussion, the code has been
600 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
602 However, for the case when a dot on a line by itself terminates a message, the
603 only recognized terminating sequences before and after the dot are LF and CRLF.
604 Otherwise, having read EOL . CR, you don't know whether to read another
607 Internally, in messages stored in Exim's spool files, LF is used as the line
608 terminator. Under the new regime, bare CRs will no longer appear in these
612 fout a FILE to which to write the message
614 Returns: One of the END_xxx values indicating why it stopped reading
618 read_message_data(FILE *fout)
622 register int linelength = 0;
624 /* Handle the case when only EOF terminates the message */
628 register int last_ch = '\n';
630 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
632 if (ch == 0) body_zerocount++;
633 if (last_ch == '\r' && ch != '\n')
635 if (linelength > max_received_linelength)
636 max_received_linelength = linelength;
638 if (fputc('\n', fout) == EOF) return END_WERROR;
642 if (ch == '\r') continue;
644 if (fputc(ch, fout) == EOF) return END_WERROR;
647 if (linelength > max_received_linelength)
648 max_received_linelength = linelength;
653 if (++message_size > thismessage_size_limit) return END_SIZE;
658 if (linelength > max_received_linelength)
659 max_received_linelength = linelength;
660 if (fputc('\n', fout) == EOF) return END_WERROR;
668 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
672 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
674 if (ch == 0) body_zerocount++;
677 case 0: /* Normal state (previous char written) */
681 if (linelength > max_received_linelength)
682 max_received_linelength = linelength;
687 { ch_state = 2; continue; }
690 case 1: /* After written "\n" */
691 if (ch == '.') { ch_state = 3; continue; }
692 if (ch == '\r') { ch_state = 2; continue; }
693 if (ch == '\n') { body_linecount++; linelength = -1; }
698 body_linecount++; /* After unwritten "\r" */
699 if (linelength > max_received_linelength)
700 max_received_linelength = linelength;
708 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
709 if (ch == '\r') continue;
715 case 3: /* After "\n." (\n written, dot not) */
716 if (ch == '\n') return END_DOT;
717 if (ch == '\r') { ch_state = 4; continue; }
720 if (fputc('.', fout) == EOF) return END_WERROR;
724 case 4: /* After "\n.\r" (\n written, rest not) */
725 if (ch == '\n') return END_DOT;
728 if (fputs(".\n", fout) == EOF) return END_WERROR;
729 if (ch == '\r') { ch_state = 2; continue; }
735 if (fputc(ch, fout) == EOF) return END_WERROR;
736 if (++message_size > thismessage_size_limit) return END_SIZE;
739 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
740 the message ends with a newline, and we must also write any characters that
741 were saved up while testing for an ending dot. */
745 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
746 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
747 message_size += Ustrlen(ends[ch_state]);
757 /*************************************************
758 * Read data portion of an SMTP message *
759 *************************************************/
761 /* This function is called to read the remainder of an SMTP message (after the
762 headers), or to skip over it when an error has occurred. In this case, the
763 output file is passed as NULL.
765 If any line begins with a dot, that character is skipped. The input should only
766 be successfully terminated by CR LF . CR LF unless it is local (non-network)
767 SMTP, in which case the CRs are optional, but...
769 FUDGE: It seems that sites on the net send out messages with just LF
770 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
771 we make the CRs optional in all cases.
773 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
774 well, so that there are no CRs in spooled messages. However, the message
775 terminating dot is not recognized between two bare CRs.
778 fout a FILE to which to write the message; NULL if skipping
780 Returns: One of the END_xxx values indicating why it stopped reading
784 read_message_data_smtp(FILE *fout)
790 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
792 if (ch == 0) body_zerocount++;
795 case 0: /* After LF or CRLF */
799 continue; /* Don't ever write . after LF */
803 /* Else fall through to handle as normal uschar. */
805 case 1: /* Normal state */
810 if (linelength > max_received_linelength)
811 max_received_linelength = linelength;
821 case 2: /* After (unwritten) CR */
823 if (linelength > max_received_linelength)
824 max_received_linelength = linelength;
833 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
834 (void) cutthrough_put_nl();
835 if (ch != '\r') ch_state = 1; else continue;
839 case 3: /* After [CR] LF . */
847 /* The dot was removed at state 3. For a doubled dot, here, reinstate
848 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
849 and to file below. */
853 (void) cutthrough_puts(&c, 1);
858 case 4: /* After [CR] LF . CR */
859 if (ch == '\n') return END_DOT;
862 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
863 (void) cutthrough_put_nl();
873 /* Add the character to the spool file, unless skipping; then loop for the
880 if (fputc(ch, fout) == EOF) return END_WERROR;
881 if (message_size > thismessage_size_limit) return END_SIZE;
884 (void) cutthrough_put_nl();
888 (void) cutthrough_puts(&c, 1);
892 /* Fall through here if EOF encountered. This indicates some kind of error,
893 since a correct message is terminated by [CR] LF . [CR] LF. */
901 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
902 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
903 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
904 body_linecount accounting for proper re-expansion for the wire, so use
905 a cut-down version of the state-machine above; we don't need to do leading-dot
906 detection and unstuffing.
909 fout a FILE to which to write the message; NULL if skipping;
910 must be open for both writing and reading.
912 Returns: One of the END_xxx values indicating why it stopped reading
916 read_message_bdat_smtp(FILE *fout)
918 int linelength = 0, ch;
919 enum CH_STATE ch_state = LF_SEEN;
924 switch ((ch = (bdat_getc)(GETC_BUFFER_UNLIMITED)))
926 case EOF: return END_EOF;
927 case ERR: return END_PROTOCOL;
929 /* Nothing to get from the sender anymore. We check the last
930 character written to the spool.
932 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
933 If we would be strict, we would refuse such broken messages.
934 But we are liberal, so we fix it. It would be easy just to append
935 the "\n" to the spool.
937 But there are some more things (line counting, message size calculation and such),
938 that would need to be duplicated here. So we simply do some ungetc
943 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
944 if (fgetc(fout) == '\n') return END_DOT;
947 if (linelength == -1) /* \r already seen (see below) */
949 DEBUG(D_receive) debug_printf("Add missing LF\n");
953 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
954 bdat_ungetc('\r'); /* not even \r was seen */
958 case '\0': body_zerocount++; break;
962 case LF_SEEN: /* After LF or CRLF */
964 /* fall through to handle as normal uschar. */
966 case MID_LINE: /* Mid-line state */
971 if (linelength > max_received_linelength)
972 max_received_linelength = linelength;
978 if (fix_nl) bdat_ungetc('\n');
979 continue; /* don't write CR */
983 case CR_SEEN: /* After (unwritten) CR */
985 if (linelength > max_received_linelength)
986 max_received_linelength = linelength;
993 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
994 (void) cutthrough_put_nl();
995 if (ch == '\r') continue; /* don't write CR */
1001 /* Add the character to the spool file, unless skipping */
1007 if (fputc(ch, fout) == EOF) return END_WERROR;
1008 if (message_size > thismessage_size_limit) return END_SIZE;
1011 (void) cutthrough_put_nl();
1015 (void) cutthrough_puts(&c, 1);
1024 /*************************************************
1025 * Swallow SMTP message *
1026 *************************************************/
1028 /* This function is called when there has been some kind of error while reading
1029 an SMTP message, and the remaining data may need to be swallowed. It is global
1030 because it is called from smtp_closedown() to shut down an incoming call
1033 Argument: a FILE from which to read the message
1038 receive_swallow_smtp(void)
1040 /*XXX CHUNKING: not enough. read chunks until RSET? */
1041 if (message_ended >= END_NOTENDED)
1042 message_ended = read_message_data_smtp(NULL);
1047 /*************************************************
1048 * Handle lost SMTP connection *
1049 *************************************************/
1051 /* This function logs connection loss incidents and generates an appropriate
1054 Argument: additional data for the message
1055 Returns: the SMTP response
1059 handle_lost_connection(uschar *s)
1061 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1062 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1063 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1064 return US"421 Lost incoming connection";
1070 /*************************************************
1071 * Handle a non-smtp reception error *
1072 *************************************************/
1074 /* This function is called for various errors during the reception of non-SMTP
1075 messages. It either sends a message to the sender of the problem message, or it
1076 writes to the standard error stream.
1079 errcode code for moan_to_sender(), identifying the error
1080 text1 first message text, passed to moan_to_sender()
1081 text2 second message text, used only for stderrr
1082 error_rc code to pass to exim_exit if no problem
1083 f FILE containing body of message (may be stdin)
1084 hptr pointer to instore headers or NULL
1086 Returns: calls exim_exit(), which does not return
1090 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1091 FILE *f, header_line *hptr)
1093 if (error_handling == ERRORS_SENDER)
1097 eblock.text1 = text1;
1098 eblock.text2 = US"";
1099 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1100 error_rc = EXIT_FAILURE;
1103 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1105 exim_exit(error_rc);
1110 /*************************************************
1111 * Add header lines set up by ACL *
1112 *************************************************/
1114 /* This function is called to add the header lines that were set up by
1115 statements in an ACL to the list of headers in memory. It is done in two stages
1116 like this, because when the ACL for RCPT is running, the other headers have not
1117 yet been received. This function is called twice; once just before running the
1118 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1119 are visible to the DATA ACL.
1121 Originally these header lines were added at the end. Now there is support for
1122 three different places: top, bottom, and after the Received: header(s). There
1123 will always be at least one Received: header, even if it is marked deleted, and
1124 even if something else has been put in front of it.
1127 acl_name text to identify which ACL
1133 add_acl_headers(int where, uschar *acl_name)
1135 header_line *h, *next;
1136 header_line *last_received = NULL;
1140 case ACL_WHERE_DKIM:
1141 case ACL_WHERE_MIME:
1142 case ACL_WHERE_DATA:
1143 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1145 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1146 " will not take effect on cutthrough deliveries");
1151 if (acl_removed_headers != NULL)
1153 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1155 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1157 const uschar * list = acl_removed_headers;
1158 int sep = ':'; /* This is specified as a colon-separated list */
1162 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1163 if (header_testname(h, s, Ustrlen(s), FALSE))
1165 h->type = htype_old;
1166 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1169 acl_removed_headers = NULL;
1170 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1173 if (acl_added_headers == NULL) return;
1174 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1176 for (h = acl_added_headers; h != NULL; h = next)
1183 h->next = header_list;
1185 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1189 if (last_received == NULL)
1191 last_received = header_list;
1192 while (!header_testname(last_received, US"Received", 8, FALSE))
1193 last_received = last_received->next;
1194 while (last_received->next != NULL &&
1195 header_testname(last_received->next, US"Received", 8, FALSE))
1196 last_received = last_received->next;
1198 h->next = last_received->next;
1199 last_received->next = h;
1200 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1204 /* add header before any header which is NOT Received: or Resent- */
1205 last_received = header_list;
1206 while ( (last_received->next != NULL) &&
1207 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1208 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1209 last_received = last_received->next;
1210 /* last_received now points to the last Received: or Resent-* header
1211 in an uninterrupted chain of those header types (seen from the beginning
1212 of all headers. Our current header must follow it. */
1213 h->next = last_received->next;
1214 last_received->next = h;
1215 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1220 header_last->next = h;
1224 if (h->next == NULL) header_last = h;
1226 /* Check for one of the known header types (From:, To:, etc.) though in
1227 practice most added headers are going to be "other". Lower case
1228 identification letters are never stored with the header; they are used
1229 for existence tests when messages are received. So discard any lower case
1232 h->type = header_checkname(h, FALSE);
1233 if (h->type >= 'a') h->type = htype_other;
1235 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", header_last->text);
1238 acl_added_headers = NULL;
1239 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1244 /*************************************************
1245 * Add host information for log line *
1246 *************************************************/
1248 /* Called for acceptance and rejecting log lines. This adds information about
1249 the calling host to a string that is being built dynamically.
1252 s the dynamic string
1253 sizeptr points to the size variable
1254 ptrptr points to the pointer variable
1256 Returns: the extended string
1260 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1262 if (sender_fullhost)
1264 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1265 s = string_cat(s, sizeptr, ptrptr, US" DS");
1266 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1267 if (LOGGING(incoming_interface) && interface_address != NULL)
1269 s = string_cat(s, sizeptr, ptrptr,
1270 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1273 if (sender_ident != NULL)
1274 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1275 if (received_protocol != NULL)
1276 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1282 #ifdef WITH_CONTENT_SCAN
1284 /*************************************************
1285 * Run the MIME ACL on a message *
1286 *************************************************/
1288 /* This code is in a subroutine so that it can be used for both SMTP
1289 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1292 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1293 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1294 smtp_reply_ptr Where SMTP reply is being built
1295 blackholed_by_ptr Where "blackholed by" message is being built
1297 Returns: TRUE to carry on; FALSE to abandon the message
1301 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1302 uschar **blackholed_by_ptr)
1305 uschar rfc822_file_path[2048];
1306 unsigned long mbox_size;
1307 header_line *my_headerlist;
1308 uschar *user_msg, *log_msg;
1309 int mime_part_count_buffer = -1;
1312 memset(CS rfc822_file_path,0,2048);
1314 /* check if it is a MIME message */
1315 my_headerlist = header_list;
1316 while (my_headerlist != NULL)
1318 /* skip deleted headers */
1319 if (my_headerlist->type == '*')
1321 my_headerlist = my_headerlist->next;
1324 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1326 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1329 my_headerlist = my_headerlist->next;
1332 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1336 /* make sure the eml mbox file is spooled up */
1337 mbox_file = spool_mbox(&mbox_size, NULL);
1338 if (mbox_file == NULL) {
1339 /* error while spooling */
1340 log_write(0, LOG_MAIN|LOG_PANIC,
1341 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1342 Uunlink(spool_name);
1344 #ifdef EXPERIMENTAL_DCC
1347 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1348 message_id[0] = 0; /* Indicate no message accepted */
1349 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1350 return FALSE; /* Indicate skip to end of receive function */
1356 mime_part_count = -1;
1357 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1358 (void)fclose(mbox_file);
1360 if (Ustrlen(rfc822_file_path) > 0)
1362 mime_part_count = mime_part_count_buffer;
1364 if (unlink(CS rfc822_file_path) == -1)
1366 log_write(0, LOG_PANIC,
1367 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1372 /* check if we must check any message/rfc822 attachments */
1375 uschar temp_path[1024];
1376 struct dirent * entry;
1379 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1380 spool_directory, message_id);
1382 tempdir = opendir(CS temp_path);
1385 if (!(entry = readdir(tempdir)))
1387 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1389 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1390 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1391 DEBUG(D_receive) debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1400 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1402 /* set RFC822 expansion variable */
1404 mime_part_count_buffer = mime_part_count;
1405 goto MIME_ACL_CHECK;
1407 log_write(0, LOG_PANIC,
1408 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1409 unlink(CS rfc822_file_path);
1414 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1417 recipients_count = 0;
1418 *blackholed_by_ptr = US"MIME ACL";
1422 Uunlink(spool_name);
1424 #ifdef EXPERIMENTAL_DCC
1428 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1430 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1431 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1433 message_id[0] = 0; /* Indicate no message accepted */
1434 return FALSE; /* Cause skip to end of receive function */
1440 #endif /* WITH_CONTENT_SCAN */
1445 received_header_gen(void)
1449 header_line *received_header= header_list;
1451 timestamp = expand_string(US"${tod_full}");
1452 if (recipients_count == 1) received_for = recipients_list[0].address;
1453 received = expand_string(received_header_text);
1454 received_for = NULL;
1458 if(spool_name[0] != 0)
1459 Uunlink(spool_name); /* Lose the data file */
1460 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1461 "(received_header_text) failed: %s", string_printing(received_header_text),
1462 expand_string_message);
1465 /* The first element on the header chain is reserved for the Received header,
1466 so all we have to do is fill in the text pointer, and set the type. However, if
1467 the result of the expansion is an empty string, we leave the header marked as
1468 "old" so as to refrain from adding a Received header. */
1470 if (received[0] == 0)
1472 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1473 received_header->type = htype_old;
1477 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1478 received_header->type = htype_received;
1481 received_header->slen = Ustrlen(received_header->text);
1483 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1484 received_header->type, received_header->text);
1489 /*************************************************
1491 *************************************************/
1493 /* Receive a message on the given input, and put it into a pair of spool files.
1494 Either a non-null list of recipients, or the extract flag will be true, or
1495 both. The flag sender_local is true for locally generated messages. The flag
1496 submission_mode is true if an ACL has obeyed "control = submission". The flag
1497 suppress_local_fixups is true if an ACL has obeyed "control =
1498 suppress_local_fixups" or -G was passed on the command-line.
1499 The flag smtp_input is true if the message is to be
1500 handled using SMTP conventions about termination and lines starting with dots.
1501 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1503 If a message was successfully read, message_id[0] will be non-zero.
1505 The general actions of this function are:
1507 . Read the headers of the message (if any) into a chain of store
1510 . If there is a "sender:" header and the message is locally originated,
1511 throw it away, unless the caller is trusted, or unless
1512 active_local_sender_retain is set - which can only happen if
1513 active_local_from_check is false.
1515 . If recipients are to be extracted from the message, build the
1516 recipients list from the headers, removing any that were on the
1517 original recipients list (unless extract_addresses_remove_arguments is
1518 false), and at the same time, remove any bcc header that may be present.
1520 . Get the spool file for the data, sort out its unique name, open
1521 and lock it (but don't give it the name yet).
1523 . Generate a "Message-Id" header if the message doesn't have one, for
1524 locally-originated messages.
1526 . Generate a "Received" header.
1528 . Ensure the recipients list is fully qualified and rewritten if necessary.
1530 . If there are any rewriting rules, apply them to the sender address
1531 and also to the headers.
1533 . If there is no from: header, generate one, for locally-generated messages
1534 and messages in "submission mode" only.
1536 . If the sender is local, check that from: is correct, and if not, generate
1537 a Sender: header, unless message comes from a trusted caller, or this
1538 feature is disabled by active_local_from_check being false.
1540 . If there is no "date" header, generate one, for locally-originated
1541 or submission mode messages only.
1543 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1544 dot_ends mode, to the data file. Leave it open, to hold the lock.
1546 . Write the envelope and the headers to a new file.
1548 . Set the name for the header file; close it.
1550 . Set the name for the data file; close it.
1552 Because this function can potentially be called many times in a single
1553 SMTP connection, all store should be got by store_get(), so that it will be
1554 automatically retrieved after the message is accepted.
1556 FUDGE: It seems that sites on the net send out messages with just LF
1557 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1558 we make the CRs optional in all cases.
1560 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1561 new regime is now in place in which bare CRs in header lines are turned into LF
1562 followed by a space, so as not to terminate the header line.
1564 February 2004: A bare LF in a header line in a message whose first line was
1565 terminated by CRLF is treated in the same way as a bare CR.
1568 extract_recip TRUE if recipients are to be extracted from the message's
1571 Returns: TRUE there are more messages to be read (SMTP input)
1572 FALSE there are no more messages to be read (non-SMTP input
1573 or SMTP connection collapsed, or other failure)
1575 When reading a message for filter testing, the returned value indicates
1576 whether the headers (which is all that is read) were terminated by '.' or
1580 receive_msg(BOOL extract_recip)
1585 int process_info_len = Ustrlen(process_info);
1586 int error_rc = (error_handling == ERRORS_SENDER)?
1587 errors_sender_rc : EXIT_FAILURE;
1588 int header_size = 256;
1589 int start, end, domain, size, sptr;
1592 int prevlines_length = 0;
1594 register int ptr = 0;
1596 BOOL contains_resent_headers = FALSE;
1597 BOOL extracted_ignored = FALSE;
1598 BOOL first_line_ended_crlf = TRUE_UNSET;
1599 BOOL smtp_yield = TRUE;
1602 BOOL resents_exist = FALSE;
1603 uschar *resent_prefix = US"";
1604 uschar *blackholed_by = NULL;
1605 uschar *blackhole_log_msg = US"";
1606 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1609 error_block *bad_addresses = NULL;
1611 uschar *frozen_by = NULL;
1612 uschar *queued_by = NULL;
1615 struct stat statbuf;
1617 /* Final message to give to SMTP caller, and messages from ACLs */
1619 uschar *smtp_reply = NULL;
1620 uschar *user_msg, *log_msg;
1622 /* Working header pointers */
1624 header_line *h, *next;
1626 /* Flags for noting the existence of certain headers (only one left) */
1628 BOOL date_header_exists = FALSE;
1630 /* Pointers to receive the addresses of headers whose contents we need. */
1632 header_line *from_header = NULL;
1633 header_line *subject_header = NULL;
1634 header_line *msgid_header = NULL;
1635 header_line *received_header;
1637 #ifdef EXPERIMENTAL_DMARC
1639 #endif /* EXPERIMENTAL_DMARC */
1641 /* Variables for use when building the Received: header. */
1646 /* Release any open files that might have been cached while preparing to
1647 accept the message - e.g. by verifying addresses - because reading a message
1648 might take a fair bit of real time. */
1652 /* Extracting the recipient list from an input file is incompatible with
1653 cutthrough delivery with the no-spool option. It shouldn't be possible
1654 to set up the combination, but just in case kill any ongoing connection. */
1655 if (extract_recip || !smtp_input)
1656 cancel_cutthrough_connection("not smtp input");
1658 /* Initialize the chain of headers by setting up a place-holder for Received:
1659 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1660 pointing to the end of the chain to make adding headers simple. */
1662 received_header = header_list = header_last = store_get(sizeof(header_line));
1663 header_list->next = NULL;
1664 header_list->type = htype_old;
1665 header_list->text = NULL;
1666 header_list->slen = 0;
1668 /* Control block for the next header to be read. */
1670 next = store_get(sizeof(header_line));
1671 next->text = store_get(header_size);
1673 /* Initialize message id to be null (indicating no message read), and the
1674 header names list to be the normal list. Indicate there is no data file open
1675 yet, initialize the size and warning count, and deal with no size limit. */
1683 received_count = 1; /* For the one we will add */
1685 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1687 /* While reading the message, the following counts are computed. */
1689 message_linecount = body_linecount = body_zerocount =
1690 max_received_linelength = 0;
1692 #ifndef DISABLE_DKIM
1693 /* Call into DKIM to set up the context. In CHUNKING mode
1694 we clear the dot-stuffing flag */
1695 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1696 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1699 #ifdef EXPERIMENTAL_DMARC
1700 /* initialize libopendmarc */
1701 dmarc_up = dmarc_init();
1704 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1705 ids, and fractions of a second are required. See the comments that precede the
1706 message id creation below. */
1708 (void)gettimeofday(&message_id_tv, NULL);
1710 /* For other uses of the received time we can operate with granularity of one
1711 second, and for that we use the global variable received_time. This is for
1712 things like ultimate message timeouts. */
1714 received_time = message_id_tv.tv_sec;
1716 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1717 happen in the smtp_getc() function when it refills its buffer. */
1719 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1721 /* If not SMTP input, timeout happens only if configured, and we just set a
1722 single timeout for the whole message. */
1724 else if (receive_timeout > 0)
1726 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1727 alarm(receive_timeout);
1730 /* SIGTERM and SIGINT are caught always. */
1732 signal(SIGTERM, data_sigterm_sigint_handler);
1733 signal(SIGINT, data_sigterm_sigint_handler);
1735 /* Header lines in messages are not supposed to be very long, though when
1736 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1737 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1738 storing the header, and extend this as necessary using string_cat().
1740 To cope with total lunacies, impose an upper limit on the length of the header
1741 section of the message, as otherwise the store will fill up. We must also cope
1742 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1743 Folded header lines are joined into one string, leaving the '\n' characters
1744 inside them, so that writing them out reproduces the input.
1746 Loop for each character of each header; the next structure for chaining the
1747 header is set up already, with ptr the offset of the next character in
1752 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1754 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1755 SMTP must have a correct "." terminator. */
1757 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1759 smtp_reply = handle_lost_connection(US" (header)");
1761 goto TIDYUP; /* Skip to end of function */
1764 /* See if we are at the current header's size limit - there must be at least
1765 four bytes left. This allows for the new character plus a zero, plus two for
1766 extra insertions when we are playing games with dots and carriage returns. If
1767 we are at the limit, extend the text buffer. This could have been done
1768 automatically using string_cat() but because this is a tightish loop storing
1769 only one character at a time, we choose to do it inline. Normally
1770 store_extend() will be able to extend the block; only at the end of a big
1771 store block will a copy be needed. To handle the case of very long headers
1772 (and sometimes lunatic messages can have ones that are 100s of K long) we
1773 call store_release() for strings that have been copied - if the string is at
1774 the start of a block (and therefore the only thing in it, because we aren't
1775 doing any other gets), the block gets freed. We can only do this release if
1776 there were no allocations since the once that we want to free. */
1778 if (ptr >= header_size - 4)
1780 int oldsize = header_size;
1781 /* header_size += 256; */
1783 if (!store_extend(next->text, oldsize, header_size))
1785 BOOL release_ok = store_last_get[store_pool] == next->text;
1786 uschar *newtext = store_get(header_size);
1787 memcpy(newtext, next->text, ptr);
1788 if (release_ok) store_release(next->text);
1789 next->text = newtext;
1793 /* Cope with receiving a binary zero. There is dispute about whether
1794 these should be allowed in RFC 822 messages. The middle view is that they
1795 should not be allowed in headers, at least. Exim takes this attitude at
1796 the moment. We can't just stomp on them here, because we don't know that
1797 this line is a header yet. Set a flag to cause scanning later. */
1799 if (ch == 0) had_zero++;
1801 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1802 those from data files use just LF. Treat LF in local SMTP input as a
1803 terminator too. Treat EOF as a line terminator always. */
1805 if (ch == EOF) goto EOL;
1807 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1808 other MTAs accept this. We are therefore forced into this "liberalisation"
1809 too, so we accept LF as a line terminator whatever the source of the message.
1810 However, if the first line of the message ended with a CRLF, we treat a bare
1811 LF specially by inserting a white space after it to ensure that the header
1812 line is not terminated. */
1816 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1817 else if (first_line_ended_crlf) receive_ungetc(' ');
1821 /* This is not the end of the line. If this is SMTP input and this is
1822 the first character in the line and it is a "." character, ignore it.
1823 This implements the dot-doubling rule, though header lines starting with
1824 dots aren't exactly common. They are legal in RFC 822, though. If the
1825 following is CRLF or LF, this is the line that that terminates the
1826 entire message. We set message_ended to indicate this has happened (to
1827 prevent further reading), and break out of the loop, having freed the
1828 empty header, and set next = NULL to indicate no data line. */
1830 if (ptr == 0 && ch == '.' && dot_ends)
1832 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1835 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1839 ch = '\r'; /* Revert to CR */
1844 message_ended = END_DOT;
1847 break; /* End character-reading loop */
1850 /* For non-SMTP input, the dot at the start of the line was really a data
1851 character. What is now in ch is the following character. We guaranteed
1852 enough space for this above. */
1856 next->text[ptr++] = '.';
1861 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1862 remember this case if this is the first line ending. */
1866 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1869 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1873 /* Otherwise, put back the character after CR, and turn the bare CR
1876 ch = (receive_ungetc)(ch);
1877 next->text[ptr++] = '\n';
1882 /* We have a data character for the header line. */
1884 next->text[ptr++] = ch; /* Add to buffer */
1885 message_size++; /* Total message size so far */
1887 /* Handle failure due to a humungously long header section. The >= allows
1888 for the terminating \n. Add what we have so far onto the headers list so
1889 that it gets reflected in any error message, and back up the just-read
1892 if (message_size >= header_maxsize)
1894 next->text[ptr] = 0;
1896 next->type = htype_other;
1898 header_last->next = next;
1901 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1902 "%s (more than %d characters): message abandoned",
1903 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1907 smtp_reply = US"552 Message header is ridiculously long";
1908 receive_swallow_smtp();
1909 goto TIDYUP; /* Skip to end of function */
1914 give_local_error(ERRMESS_VLONGHEADER,
1915 string_sprintf("message header longer than %d characters received: "
1916 "message not accepted", header_maxsize), US"", error_rc, stdin,
1918 /* Does not return */
1922 continue; /* With next input character */
1924 /* End of header line reached */
1928 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1930 receive_linecount++;
1931 message_linecount++;
1933 /* Keep track of maximum line length */
1935 if (ptr - prevlines_length > max_received_linelength)
1936 max_received_linelength = ptr - prevlines_length;
1937 prevlines_length = ptr + 1;
1939 /* Now put in the terminating newline. There is always space for
1940 at least two more characters. */
1942 next->text[ptr++] = '\n';
1945 /* A blank line signals the end of the headers; release the unwanted
1946 space and set next to NULL to indicate this. */
1955 /* There is data in the line; see if the next input character is a
1956 whitespace character. If it is, we have a continuation of this header line.
1957 There is always space for at least one character at this point. */
1961 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1962 if (nextch == ' ' || nextch == '\t')
1964 next->text[ptr++] = nextch;
1966 continue; /* Iterate the loop */
1968 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1969 else ch = EOF; /* Cause main loop to exit at end */
1972 /* We have got to the real line end. Terminate the string and release store
1973 beyond it. If it turns out to be a real header, internal binary zeros will
1974 be squashed later. */
1976 next->text[ptr] = 0;
1978 store_reset(next->text + ptr + 1);
1980 /* Check the running total size against the overall message size limit. We
1981 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1982 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1983 headers - the code to read the body will then also hit the buffer. */
1985 if (message_size > thismessage_size_limit) break;
1987 /* A line that is not syntactically correct for a header also marks
1988 the end of the headers. In this case, we leave next containing the
1989 first data line. This might actually be several lines because of the
1990 continuation logic applied above, but that doesn't matter.
1992 It turns out that smail, and presumably sendmail, accept leading lines
1995 From ph10 Fri Jan 5 12:35 GMT 1996
1997 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1998 find any documentation of this, but for compatibility it had better be
1999 accepted. Exim restricts it to the case of non-smtp messages, and
2000 treats it as an alternative to the -f command line option. Thus it is
2001 ignored except for trusted users or filter testing. Otherwise it is taken
2002 as the sender address, unless -f was used (sendmail compatibility).
2004 It further turns out that some UUCPs generate the From_line in a different
2007 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2009 The regex for matching these things is now capable of recognizing both
2010 formats (including 2- and 4-digit years in the latter). In fact, the regex
2011 is now configurable, as is the expansion string to fish out the sender.
2013 Even further on it has been discovered that some broken clients send
2014 these lines in SMTP messages. There is now an option to ignore them from
2015 specified hosts or networks. Sigh. */
2017 if (header_last == header_list &&
2020 (sender_host_address != NULL &&
2021 verify_check_host(&ignore_fromline_hosts) == OK)
2023 (sender_host_address == NULL && ignore_fromline_local)
2025 regex_match_and_setup(regex_From, next->text, 0, -1))
2027 if (!sender_address_forced)
2029 uschar *uucp_sender = expand_string(uucp_from_sender);
2030 if (uucp_sender == NULL)
2032 log_write(0, LOG_MAIN|LOG_PANIC,
2033 "expansion of \"%s\" failed after matching "
2034 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2038 int start, end, domain;
2040 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2041 &start, &end, &domain, TRUE);
2042 if (newsender != NULL)
2044 if (domain == 0 && newsender[0] != 0)
2045 newsender = rewrite_address_qualify(newsender, FALSE);
2047 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2049 sender_address = newsender;
2051 if (trusted_caller || filter_test != FTEST_NONE)
2053 authenticated_sender = NULL;
2054 originator_name = US"";
2055 sender_local = FALSE;
2058 if (filter_test != FTEST_NONE)
2059 printf("Sender taken from \"From \" line\n");
2066 /* Not a leading "From " line. Check to see if it is a valid header line.
2067 Header names may contain any non-control characters except space and colon,
2072 uschar *p = next->text;
2074 /* If not a valid header line, break from the header reading loop, leaving
2075 next != NULL, indicating that it holds the first line of the body. */
2077 if (isspace(*p)) break;
2078 while (mac_isgraph(*p) && *p != ':') p++;
2079 while (isspace(*p)) p++;
2082 body_zerocount = had_zero;
2086 /* We have a valid header line. If there were any binary zeroes in
2087 the line, stomp on them here. */
2090 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2092 /* It is perfectly legal to have an empty continuation line
2093 at the end of a header, but it is confusing to humans
2094 looking at such messages, since it looks like a blank line.
2095 Reduce confusion by removing redundant white space at the
2096 end. We know that there is at least one printing character
2097 (the ':' tested for above) so there is no danger of running
2100 p = next->text + ptr - 2;
2103 while (*p == ' ' || *p == '\t') p--;
2104 if (*p != '\n') break;
2105 ptr = (p--) - next->text + 1;
2106 message_size -= next->slen - ptr;
2107 next->text[ptr] = 0;
2111 /* Add the header to the chain */
2113 next->type = htype_other;
2115 header_last->next = next;
2118 /* Check the limit for individual line lengths. This comes after adding to
2119 the chain so that the failing line is reflected if a bounce is generated
2120 (for a local message). */
2122 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2124 log_write(0, LOG_MAIN, "overlong message header line received from "
2125 "%s (more than %d characters): message abandoned",
2126 sender_host_unknown? sender_ident : sender_fullhost,
2127 header_line_maxsize);
2131 smtp_reply = US"552 A message header line is too long";
2132 receive_swallow_smtp();
2133 goto TIDYUP; /* Skip to end of function */
2138 give_local_error(ERRMESS_VLONGHDRLINE,
2139 string_sprintf("message header line longer than %d characters "
2140 "received: message not accepted", header_line_maxsize), US"",
2141 error_rc, stdin, header_list->next);
2142 /* Does not return */
2146 /* Note if any resent- fields exist. */
2148 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2150 resents_exist = TRUE;
2151 resent_prefix = US"Resent-";
2155 /* Reject CHUNKING messages that do not CRLF their first header line */
2157 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2159 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2160 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2162 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2163 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2164 smtp_printf("552 Message header not CRLF terminated\r\n");
2167 goto TIDYUP; /* Skip to end of function */
2170 /* The line has been handled. If we have hit EOF, break out of the loop,
2171 indicating no pending data line. */
2173 if (ch == EOF) { next = NULL; break; }
2175 /* Set up for the next header */
2178 next = store_get(sizeof(header_line));
2179 next->text = store_get(header_size);
2182 prevlines_length = 0;
2183 } /* Continue, starting to read the next header */
2185 /* At this point, we have read all the headers into a data structure in main
2186 store. The first header is still the dummy placeholder for the Received: header
2187 we are going to generate a bit later on. If next != NULL, it contains the first
2188 data line - which terminated the headers before reaching a blank line (not the
2193 debug_printf(">>Headers received:\n");
2194 for (h = header_list->next; h; h = h->next)
2195 debug_printf("%s", h->text);
2199 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2200 is dropped immediately after valid headers, the next thing we will see is EOF.
2201 We must test for this specially, as further down the reading of the data is
2202 skipped if already at EOF. */
2204 if (smtp_input && (receive_feof)())
2206 smtp_reply = handle_lost_connection(US" (after header)");
2208 goto TIDYUP; /* Skip to end of function */
2211 /* If this is a filter test run and no headers were read, output a warning
2212 in case there is a mistake in the test message. */
2214 if (filter_test != FTEST_NONE && header_list->next == NULL)
2215 printf("Warning: no message headers read\n");
2218 /* Scan the headers to identify them. Some are merely marked for later
2219 processing; some are dealt with here. */
2221 for (h = header_list->next; h; h = h->next)
2223 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2224 if (is_resent) contains_resent_headers = TRUE;
2226 switch (header_checkname(h, is_resent))
2229 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2233 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2236 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2239 if (!resents_exist || is_resent) date_header_exists = TRUE;
2242 /* Same comments as about Return-Path: below. */
2244 case htype_delivery_date:
2245 if (delivery_date_remove) h->type = htype_old;
2248 /* Same comments as about Return-Path: below. */
2250 case htype_envelope_to:
2251 if (envelope_to_remove) h->type = htype_old;
2254 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2255 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2256 header consists of just the login id of the user who called Exim, rewrite
2257 it with the gecos field first. Apply this rule to Resent-From: if there
2258 are resent- fields. */
2261 h->type = htype_from;
2262 if (!resents_exist || is_resent)
2268 uschar *s = Ustrchr(h->text, ':') + 1;
2269 while (isspace(*s)) s++;
2270 len = h->slen - (s - h->text) - 1;
2271 if (Ustrlen(originator_login) == len &&
2272 strncmpic(s, originator_login, len) == 0)
2274 uschar *name = is_resent? US"Resent-From" : US"From";
2275 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2276 originator_login, qualify_domain_sender);
2277 from_header = header_last;
2278 h->type = htype_old;
2279 DEBUG(D_receive|D_rewrite)
2280 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2286 /* Identify the Message-id: header for generating "in-reply-to" in the
2287 autoreply transport. For incoming logging, save any resent- value. In both
2288 cases, take just the first of any multiples. */
2291 if (msgid_header == NULL && (!resents_exist || is_resent))
2298 /* Flag all Received: headers */
2300 case htype_received:
2301 h->type = htype_received;
2305 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2307 case htype_reply_to:
2308 h->type = htype_reply_to;
2311 /* The Return-path: header is supposed to be added to messages when
2312 they leave the SMTP system. We shouldn't receive messages that already
2313 contain Return-path. However, since Exim generates Return-path: on
2314 local delivery, resent messages may well contain it. We therefore
2315 provide an option (which defaults on) to remove any Return-path: headers
2316 on input. Removal actually means flagging as "old", which prevents the
2317 header being transmitted with the message. */
2319 case htype_return_path:
2320 if (return_path_remove) h->type = htype_old;
2322 /* If we are testing a mail filter file, use the value of the
2323 Return-Path: header to set up the return_path variable, which is not
2324 otherwise set. However, remove any <> that surround the address
2325 because the variable doesn't have these. */
2327 if (filter_test != FTEST_NONE)
2329 uschar *start = h->text + 12;
2330 uschar *end = start + Ustrlen(start);
2331 while (isspace(*start)) start++;
2332 while (end > start && isspace(end[-1])) end--;
2333 if (*start == '<' && end[-1] == '>')
2338 return_path = string_copyn(start, end - start);
2339 printf("Return-path taken from \"Return-path:\" header line\n");
2343 /* If there is a "Sender:" header and the message is locally originated,
2344 and from an untrusted caller and suppress_local_fixups is not set, or if we
2345 are in submission mode for a remote message, mark it "old" so that it will
2346 not be transmitted with the message, unless active_local_sender_retain is
2347 set. (This can only be true if active_local_from_check is false.) If there
2348 are any resent- headers in the message, apply this rule to Resent-Sender:
2349 instead of Sender:. Messages with multiple resent- header sets cannot be
2350 tidily handled. (For this reason, at least one MUA - Pine - turns old
2351 resent- headers into X-resent- headers when resending, leaving just one
2355 h->type = ((!active_local_sender_retain &&
2357 (sender_local && !trusted_caller && !suppress_local_fixups)
2361 (!resents_exist||is_resent))?
2362 htype_old : htype_sender;
2365 /* Remember the Subject: header for logging. There is no Resent-Subject */
2371 /* "To:" gets flagged, and the existence of a recipient header is noted,
2372 whether it's resent- or not. */
2377 to_or_cc_header_exists = TRUE;
2383 /* Extract recipients from the headers if that is required (the -t option).
2384 Note that this is documented as being done *before* any address rewriting takes
2385 place. There are two possibilities:
2387 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2388 recipients already listed are to be REMOVED from the message. Smail 3 works
2389 like this. We need to build a non-recipients tree for that list, because in
2390 subsequent processing this data is held in a tree and that's what the
2391 spool_write_header() function expects. Make sure that non-recipient addresses
2392 are fully qualified and rewritten if necessary.
2394 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2395 those in the command line arguments (and it is rumoured some other MTAs do
2396 this). Therefore, there is an option to make Exim behave this way.
2398 *** Notes on "Resent-" header lines ***
2400 The presence of resent-headers in the message makes -t horribly ambiguous.
2401 Experiments with sendmail showed that it uses recipients for all resent-
2402 headers, totally ignoring the concept of "sets of resent- headers" as described
2403 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2404 with all the addresses in one instance of each header.
2406 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2407 error for -t if there were resent- headers in the message. However, after a
2408 discussion on the mailing list, I've learned that there are MUAs that use
2409 resent- headers with -t, and also that the stuff about sets of resent- headers
2410 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2411 message with -t and resent- header lines makes sure that only *its* resent-
2412 headers are present; previous ones are often renamed as X-resent- for example.
2414 Consequently, Exim has been changed so that, if any resent- header lines are
2415 present, the recipients are taken from all of the appropriate resent- lines,
2416 and not from the ordinary To:, Cc:, etc. */
2421 error_block **bnext = &bad_addresses;
2423 if (extract_addresses_remove_arguments)
2425 while (recipients_count-- > 0)
2427 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2428 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2429 tree_add_nonrecipient(s);
2431 recipients_list = NULL;
2432 recipients_count = recipients_list_max = 0;
2435 /* Now scan the headers */
2437 for (h = header_list->next; h; h = h->next)
2439 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2440 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2442 uschar *s = Ustrchr(h->text, ':') + 1;
2443 while (isspace(*s)) s++;
2445 parse_allow_group = TRUE; /* Allow address group syntax */
2449 uschar *ss = parse_find_address_end(s, FALSE);
2450 uschar *recipient, *errmess, *p, *pp;
2451 int start, end, domain;
2453 /* Check on maximum */
2455 if (recipients_max > 0 && ++rcount > recipients_max)
2457 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2458 US"message rejected: ", error_rc, stdin, NULL);
2459 /* Does not return */
2462 /* Make a copy of the address, and remove any internal newlines. These
2463 may be present as a result of continuations of the header line. The
2464 white space that follows the newline must not be removed - it is part
2467 pp = recipient = store_get(ss - s + 1);
2468 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2473 BOOL b = allow_utf8_domains;
2474 allow_utf8_domains = TRUE;
2476 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2480 if (string_is_utf8(recipient))
2481 message_smtputf8 = TRUE;
2483 allow_utf8_domains = b;
2487 /* Keep a list of all the bad addresses so we can send a single
2488 error message at the end. However, an empty address is not an error;
2489 just ignore it. This can come from an empty group list like
2491 To: Recipients of list:;
2493 If there are no recipients at all, an error will occur later. */
2495 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2497 int len = Ustrlen(s);
2498 error_block *b = store_get(sizeof(error_block));
2499 while (len > 0 && isspace(s[len-1])) len--;
2501 b->text1 = string_printing(string_copyn(s, len));
2507 /* If the recipient is already in the nonrecipients tree, it must
2508 have appeared on the command line with the option extract_addresses_
2509 remove_arguments set. Do not add it to the recipients, and keep a note
2510 that this has happened, in order to give a better error if there are
2511 no recipients left. */
2513 else if (recipient != NULL)
2515 if (tree_search(tree_nonrecipients, recipient) == NULL)
2516 receive_add_recipient(recipient, -1);
2518 extracted_ignored = TRUE;
2521 /* Move on past this address */
2523 s = ss + (*ss? 1:0);
2524 while (isspace(*s)) s++;
2525 } /* Next address */
2527 parse_allow_group = FALSE; /* Reset group syntax flags */
2528 parse_found_group = FALSE;
2530 /* If this was the bcc: header, mark it "old", which means it
2531 will be kept on the spool, but not transmitted as part of the
2534 if (h->type == htype_bcc) h->type = htype_old;
2535 } /* For appropriate header line */
2536 } /* For each header line */
2540 /* Now build the unique message id. This has changed several times over the
2541 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2542 Retaining all the history in the comment has become too unwieldy - read
2543 previous release sources if you want it.
2545 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2546 The first part is the current time, in seconds. The second part is the current
2547 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2548 can hold a number in the range 0-3843. It used to be a computed sequence
2549 number, but is now the fractional component of the current time in units of
2550 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2551 received, Exim ensures that the timer has ticked at the appropriate level
2552 before proceeding, to avoid duplication if the pid happened to be re-used
2553 within the same time period. It seems likely that most messages will take at
2554 least half a millisecond to be received, so no delay will normally be
2555 necessary. At least for some time...
2557 There is a modification when localhost_number is set. Formerly this was allowed
2558 to be as large as 255. Now it is restricted to the range 0-16, and the final
2559 component of the message id becomes (localhost_number * 200) + fractional time
2560 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2562 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2563 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2564 still allows the tttttt field to hold a large enough number to last for some
2565 more decades, and the final two-digit field can hold numbers up to 1295, which
2566 is enough for milliseconds (instead of 1/2000 of a second).
2568 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2569 pid, so it is probably safe because pids have to be positive. The
2570 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2571 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2573 Note that string_base62() returns its data in a static storage block, so it
2574 must be copied before calling string_base62() again. It always returns exactly
2577 There doesn't seem to be anything in the RFC which requires a message id to
2578 start with a letter, but Smail was changed to ensure this. The external form of
2579 the message id (as supplied by string expansion) therefore starts with an
2580 additional leading 'E'. The spool file names do not include this leading
2581 letter and it is not used internally.
2583 NOTE: If ever the format of message ids is changed, the regular expression for
2584 checking that a string is in this format must be updated in a corresponding
2585 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2586 must also be changed to reflect the correct string length. The queue-sort code
2587 needs to know the layout. Then, of course, other programs that rely on the
2588 message id format will need updating too. */
2590 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2591 message_id[6] = '-';
2592 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2594 /* Deal with the case where the host number is set. The value of the number was
2595 checked when it was read, to ensure it isn't too big. The timing granularity is
2596 left in id_resolution so that an appropriate wait can be done after receiving
2597 the message, if necessary (we hope it won't be). */
2599 if (host_number_string != NULL)
2601 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2602 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2603 string_base62((long int)(
2604 host_number * (1000000/id_resolution) +
2605 message_id_tv.tv_usec/id_resolution)) + 4);
2608 /* Host number not set: final field is just the fractional time at an
2609 appropriate resolution. */
2613 id_resolution = (BASE_62 == 62)? 500 : 1000;
2614 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2615 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2618 /* Add the current message id onto the current process info string if
2621 (void)string_format(process_info + process_info_len,
2622 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2624 /* If we are using multiple input directories, set up the one for this message
2625 to be the least significant base-62 digit of the time of arrival. Otherwise
2626 ensure that it is an empty string. */
2628 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2630 /* Now that we have the message-id, if there is no message-id: header, generate
2631 one, but only for local (without suppress_local_fixups) or submission mode
2632 messages. This can be user-configured if required, but we had better flatten
2633 any illegal characters therein. */
2635 if (msgid_header == NULL &&
2636 ((sender_host_address == NULL && !suppress_local_fixups)
2637 || submission_mode))
2640 uschar *id_text = US"";
2641 uschar *id_domain = primary_hostname;
2643 /* Permit only letters, digits, dots, and hyphens in the domain */
2645 if (message_id_domain != NULL)
2647 uschar *new_id_domain = expand_string(message_id_domain);
2648 if (new_id_domain == NULL)
2650 if (!expand_string_forcedfail)
2651 log_write(0, LOG_MAIN|LOG_PANIC,
2652 "expansion of \"%s\" (message_id_header_domain) "
2653 "failed: %s", message_id_domain, expand_string_message);
2655 else if (*new_id_domain != 0)
2657 id_domain = new_id_domain;
2658 for (p = id_domain; *p != 0; p++)
2659 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2663 /* Permit all characters except controls and RFC 2822 specials in the
2664 additional text part. */
2666 if (message_id_text != NULL)
2668 uschar *new_id_text = expand_string(message_id_text);
2669 if (new_id_text == NULL)
2671 if (!expand_string_forcedfail)
2672 log_write(0, LOG_MAIN|LOG_PANIC,
2673 "expansion of \"%s\" (message_id_header_text) "
2674 "failed: %s", message_id_text, expand_string_message);
2676 else if (*new_id_text != 0)
2678 id_text = new_id_text;
2679 for (p = id_text; *p != 0; p++)
2680 if (mac_iscntrl_or_special(*p)) *p = '-';
2684 /* Add the header line
2685 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2686 * appended, to preserve classical expectations of header ordering. */
2688 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2689 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2690 (*id_text == 0)? "" : ".", id_text, id_domain);
2693 /* If we are to log recipients, keep a copy of the raw ones before any possible
2694 rewriting. Must copy the count, because later ACLs and the local_scan()
2695 function may mess with the real recipients. */
2697 if (LOGGING(received_recipients))
2699 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2700 for (i = 0; i < recipients_count; i++)
2701 raw_recipients[i] = string_copy(recipients_list[i].address);
2702 raw_recipients_count = recipients_count;
2705 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2706 recipients will get here only if the conditions were right (allow_unqualified_
2707 recipient is TRUE). */
2709 for (i = 0; i < recipients_count; i++)
2710 recipients_list[i].address =
2711 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2712 global_rewrite_rules, rewrite_existflags);
2714 /* If there is no From: header, generate one for local (without
2715 suppress_local_fixups) or submission_mode messages. If there is no sender
2716 address, but the sender is local or this is a local delivery error, use the
2717 originator login. This shouldn't happen for genuine bounces, but might happen
2718 for autoreplies. The addition of From: must be done *before* checking for the
2719 possible addition of a Sender: header, because untrusted_set_sender allows an
2720 untrusted user to set anything in the envelope (which might then get info
2721 From:) but we still want to ensure a valid Sender: if it is required. */
2723 if (from_header == NULL &&
2724 ((sender_host_address == NULL && !suppress_local_fixups)
2725 || submission_mode))
2727 uschar *oname = US"";
2729 /* Use the originator_name if this is a locally submitted message and the
2730 caller is not trusted. For trusted callers, use it only if -F was used to
2731 force its value or if we have a non-SMTP message for which -f was not used
2732 to set the sender. */
2734 if (sender_host_address == NULL)
2736 if (!trusted_caller || sender_name_forced ||
2737 (!smtp_input && !sender_address_forced))
2738 oname = originator_name;
2741 /* For non-locally submitted messages, the only time we use the originator
2742 name is when it was forced by the /name= option on control=submission. */
2746 if (submission_name != NULL) oname = submission_name;
2749 /* Envelope sender is empty */
2751 if (sender_address[0] == 0)
2753 uschar *fromstart, *fromend;
2755 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2756 oname, (oname[0] == 0)? "" : " <");
2757 fromend = (oname[0] == 0)? US"" : US">";
2759 if (sender_local || local_error_message)
2761 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2762 local_part_quote(originator_login), qualify_domain_sender,
2765 else if (submission_mode && authenticated_id != NULL)
2767 if (submission_domain == NULL)
2769 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2770 local_part_quote(authenticated_id), qualify_domain_sender,
2773 else if (submission_domain[0] == 0) /* empty => whole address set */
2775 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2780 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2781 local_part_quote(authenticated_id), submission_domain,
2784 from_header = header_last; /* To get it checked for Sender: */
2788 /* There is a non-null envelope sender. Build the header using the original
2789 sender address, before any rewriting that might have been done while
2794 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2796 (oname[0] == 0)? "" : " <",
2797 (sender_address_unrewritten == NULL)?
2798 sender_address : sender_address_unrewritten,
2799 (oname[0] == 0)? "" : ">");
2801 from_header = header_last; /* To get it checked for Sender: */
2806 /* If the sender is local (without suppress_local_fixups), or if we are in
2807 submission mode and there is an authenticated_id, check that an existing From:
2808 is correct, and if not, generate a Sender: header, unless disabled. Any
2809 previously-existing Sender: header was removed above. Note that sender_local,
2810 as well as being TRUE if the caller of exim is not trusted, is also true if a
2811 trusted caller did not supply a -f argument for non-smtp input. To allow
2812 trusted callers to forge From: without supplying -f, we have to test explicitly
2813 here. If the From: header contains more than one address, then the call to
2814 parse_extract_address fails, and a Sender: header is inserted, as required. */
2816 if (from_header != NULL &&
2817 (active_local_from_check &&
2818 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2819 (submission_mode && authenticated_id != NULL))
2822 BOOL make_sender = TRUE;
2823 int start, end, domain;
2825 uschar *from_address =
2826 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2827 &start, &end, &domain, FALSE);
2828 uschar *generated_sender_address;
2830 if (submission_mode)
2832 if (submission_domain == NULL)
2834 generated_sender_address = string_sprintf("%s@%s",
2835 local_part_quote(authenticated_id), qualify_domain_sender);
2837 else if (submission_domain[0] == 0) /* empty => full address */
2839 generated_sender_address = string_sprintf("%s",
2844 generated_sender_address = string_sprintf("%s@%s",
2845 local_part_quote(authenticated_id), submission_domain);
2849 generated_sender_address = string_sprintf("%s@%s",
2850 local_part_quote(originator_login), qualify_domain_sender);
2852 /* Remove permitted prefixes and suffixes from the local part of the From:
2853 address before doing the comparison with the generated sender. */
2855 if (from_address != NULL)
2858 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2860 if (at != NULL) *at = 0;
2861 from_address += route_check_prefix(from_address, local_from_prefix);
2862 slen = route_check_suffix(from_address, local_from_suffix);
2865 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2866 from_address += slen;
2868 if (at != NULL) *at = '@';
2870 if (strcmpic(generated_sender_address, from_address) == 0 ||
2871 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2872 make_sender = FALSE;
2875 /* We have to cause the Sender header to be rewritten if there are
2876 appropriate rewriting rules. */
2880 if (submission_mode && submission_name == NULL)
2881 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2882 generated_sender_address);
2884 header_add(htype_sender, "%sSender: %s <%s>\n",
2886 submission_mode? submission_name : originator_name,
2887 generated_sender_address);
2890 /* Ensure that a non-null envelope sender address corresponds to the
2891 submission mode sender address. */
2893 if (submission_mode && sender_address[0] != 0)
2895 if (sender_address_unrewritten == NULL)
2896 sender_address_unrewritten = sender_address;
2897 sender_address = generated_sender_address;
2898 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2899 log_write(L_address_rewrite, LOG_MAIN,
2900 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2901 sender_address_unrewritten, generated_sender_address);
2905 /* If there are any rewriting rules, apply them to the sender address, unless
2906 it has already been rewritten as part of verification for SMTP input. */
2908 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2909 sender_address[0] != 0)
2911 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2912 global_rewrite_rules, rewrite_existflags);
2913 DEBUG(D_receive|D_rewrite)
2914 debug_printf("rewritten sender = %s\n", sender_address);
2918 /* The headers must be run through rewrite_header(), because it ensures that
2919 addresses are fully qualified, as well as applying any rewriting rules that may
2922 Qualification of header addresses in a message from a remote host happens only
2923 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2924 appropriate. For local messages, qualification always happens, unless -bnq is
2925 used to explicitly suppress it. No rewriting is done for an unqualified address
2926 that is left untouched.
2928 We start at the second header, skipping our own Received:. This rewriting is
2929 documented as happening *after* recipient addresses are taken from the headers
2930 by the -t command line option. An added Sender: gets rewritten here. */
2932 for (h = header_list->next; h; h = h->next)
2934 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2935 rewrite_existflags, TRUE);
2940 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2941 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2942 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2943 exists, this applies to the set of resent- headers rather than the normal set.
2945 The requirement for a recipient header has been removed in RFC 2822. At this
2946 point in the code, earlier versions of Exim added a To: header for locally
2947 submitted messages, and an empty Bcc: header for others. In the light of the
2948 changes in RFC 2822, this was dropped in November 2003. */
2951 /* If there is no date header, generate one if the message originates locally
2952 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2953 submission mode flag is set. Messages without Date: are not valid, but it seems
2954 to be more confusing if Exim adds one to all remotely-originated messages.
2955 As per Message-Id, we prepend if resending, else append.
2958 if (!date_header_exists &&
2959 ((sender_host_address == NULL && !suppress_local_fixups)
2960 || submission_mode))
2961 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2962 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2964 search_tidyup(); /* Free any cached resources */
2966 /* Show the complete set of headers if debugging. Note that the first one (the
2967 new Received:) has not yet been set. */
2971 debug_printf(">>Headers after rewriting and local additions:\n");
2972 for (h = header_list->next; h != NULL; h = h->next)
2973 debug_printf("%c %s", h->type, h->text);
2977 /* The headers are now complete in store. If we are running in filter
2978 testing mode, that is all this function does. Return TRUE if the message
2979 ended with a dot. */
2981 if (filter_test != FTEST_NONE)
2983 process_info[process_info_len] = 0;
2984 return message_ended == END_DOT;
2987 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2988 think more if it could be handled. Cannot do onward CHUNKING unless
2989 inbound is, but inbound chunking ought to be ok with outbound plain.
2990 Could we do onward CHUNKING given inbound CHUNKING?
2992 if (chunking_state > CHUNKING_OFFERED)
2993 cancel_cutthrough_connection("chunking active");
2995 /* Cutthrough delivery:
2996 We have to create the Received header now rather than at the end of reception,
2997 so the timestamp behaviour is a change to the normal case.
2998 XXX Ensure this gets documented XXX.
2999 Having created it, send the headers to the destination. */
3000 if (cutthrough.fd >= 0)
3002 if (received_count > received_headers_max)
3004 cancel_cutthrough_connection("too many headers");
3005 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3006 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3007 "Too many \"Received\" headers",
3009 (sender_fullhost == NULL)? "" : " H=",
3010 (sender_fullhost == NULL)? US"" : sender_fullhost,
3011 (sender_ident == NULL)? "" : " U=",
3012 (sender_ident == NULL)? US"" : sender_ident);
3013 message_id[0] = 0; /* Indicate no message accepted */
3014 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3015 goto TIDYUP; /* Skip to end of function */
3017 received_header_gen();
3018 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3019 (void) cutthrough_headers_send();
3023 /* Open a new spool file for the data portion of the message. We need
3024 to access it both via a file descriptor and a stream. Try to make the
3025 directory if it isn't there. */
3027 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3028 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3030 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3032 if (errno == ENOENT)
3034 (void) directory_make(spool_directory,
3035 spool_sname(US"input", message_subdir),
3036 INPUT_DIRECTORY_MODE, TRUE);
3037 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3040 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3041 spool_name, strerror(errno));
3044 /* Make sure the file's group is the Exim gid, and double-check the mode
3045 because the group setting doesn't always get set automatically. */
3047 if (fchown(data_fd, exim_uid, exim_gid))
3048 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3049 "Failed setting ownership on spool file %s: %s",
3050 spool_name, strerror(errno));
3051 (void)fchmod(data_fd, SPOOL_MODE);
3053 /* We now have data file open. Build a stream for it and lock it. We lock only
3054 the first line of the file (containing the message ID) because otherwise there
3055 are problems when Exim is run under Cygwin (I'm told). See comments in
3056 spool_in.c, where the same locking is done. */
3058 data_file = fdopen(data_fd, "w+");
3059 lock_data.l_type = F_WRLCK;
3060 lock_data.l_whence = SEEK_SET;
3061 lock_data.l_start = 0;
3062 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3064 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3065 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3066 errno, strerror(errno));
3068 /* We have an open, locked data file. Write the message id to it to make it
3069 self-identifying. Then read the remainder of the input of this message and
3070 write it to the data file. If the variable next != NULL, it contains the first
3071 data line (which was read as a header but then turned out not to have the right
3072 format); write it (remembering that it might contain binary zeros). The result
3073 of fwrite() isn't inspected; instead we call ferror() below. */
3075 fprintf(data_file, "%s-D\n", message_id);
3078 uschar *s = next->text;
3079 int len = next->slen;
3080 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3081 body_linecount++; /* Assumes only 1 line */
3084 /* Note that we might already be at end of file, or the logical end of file
3085 (indicated by '.'), or might have encountered an error while writing the
3086 message id or "next" line. */
3088 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3092 message_ended = chunking_state > CHUNKING_OFFERED
3093 ? read_message_bdat_smtp(data_file)
3094 : read_message_data_smtp(data_file);
3095 receive_linecount++; /* The terminating "." line */
3097 else message_ended = read_message_data(data_file);
3099 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3100 message_linecount += body_linecount;
3102 switch (message_ended)
3104 /* Handle premature termination of SMTP */
3109 Uunlink(spool_name); /* Lose data file when closed */
3110 cancel_cutthrough_connection("sender closed connection");
3111 message_id[0] = 0; /* Indicate no message accepted */
3112 smtp_reply = handle_lost_connection(US"");
3114 goto TIDYUP; /* Skip to end of function */
3118 /* Handle message that is too big. Don't use host_or_ident() in the log
3119 message; we want to see the ident value even for non-remote messages. */
3122 Uunlink(spool_name); /* Lose the data file when closed */
3123 cancel_cutthrough_connection("mail too big");
3124 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3126 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3127 "message too big: read=%d max=%d",
3129 (sender_fullhost == NULL)? "" : " H=",
3130 (sender_fullhost == NULL)? US"" : sender_fullhost,
3131 (sender_ident == NULL)? "" : " U=",
3132 (sender_ident == NULL)? US"" : sender_ident,
3134 thismessage_size_limit);
3138 smtp_reply = US"552 Message size exceeds maximum permitted";
3139 message_id[0] = 0; /* Indicate no message accepted */
3140 goto TIDYUP; /* Skip to end of function */
3144 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3145 give_local_error(ERRMESS_TOOBIG,
3146 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3147 US"message rejected: ", error_rc, data_file, header_list);
3148 /* Does not return */
3152 /* Handle bad BDAT protocol sequence */
3155 Uunlink(spool_name); /* Lose the data file when closed */
3156 cancel_cutthrough_connection("sender protocol error");
3157 smtp_reply = US""; /* Response already sent */
3158 message_id[0] = 0; /* Indicate no message accepted */
3159 goto TIDYUP; /* Skip to end of function */
3163 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3164 example, there may be some expansion in an ACL that uses a timer.) */
3166 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3168 /* The message body has now been read into the data file. Call fflush() to
3169 empty the buffers in C, and then call fsync() to get the data written out onto
3170 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3171 having to do this). If there was an I/O error on either input or output,
3172 attempt to send an error message, and unlink the spool file. For non-SMTP input
3173 we can then give up. Note that for SMTP input we must swallow the remainder of
3174 the input in cases of output errors, since the far end doesn't expect to see
3175 anything until the terminating dot line is sent. */
3177 if (fflush(data_file) == EOF || ferror(data_file) ||
3178 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3180 uschar *msg_errno = US strerror(errno);
3181 BOOL input_error = (receive_ferror)() != 0;
3182 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3183 input_error? "Input read" : "Spool write",
3185 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3187 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3188 Uunlink(spool_name); /* Lose the data file */
3189 cancel_cutthrough_connection("error writing spoolfile");
3194 smtp_reply = US"451 Error while reading input data";
3197 smtp_reply = US"451 Error while writing spool file";
3198 receive_swallow_smtp();
3200 message_id[0] = 0; /* Indicate no message accepted */
3201 goto TIDYUP; /* Skip to end of function */
3206 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3207 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3209 /* Does not return */
3214 /* No I/O errors were encountered while writing the data file. */
3216 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3219 /* If there were any bad addresses extracted by -t, or there were no recipients
3220 left after -t, send a message to the sender of this message, or write it to
3221 stderr if the error handling option is set that way. Note that there may
3222 legitimately be no recipients for an SMTP message if they have all been removed
3225 We need to rewind the data file in order to read it. In the case of no
3226 recipients or stderr error writing, throw the data file away afterwards, and
3227 exit. (This can't be SMTP, which always ensures there's at least one
3228 syntactically good recipient address.) */
3230 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3234 if (recipients_count == 0) debug_printf("*** No recipients\n");
3235 if (bad_addresses != NULL)
3237 error_block *eblock = bad_addresses;
3238 debug_printf("*** Bad address(es)\n");
3239 while (eblock != NULL)
3241 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3242 eblock = eblock->next;
3247 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3249 /* If configured to send errors to the sender, but this fails, force
3250 a failure error code. We use a special one for no recipients so that it
3251 can be detected by the autoreply transport. Otherwise error_rc is set to
3252 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3253 it is EXIT_SUCCESS. */
3255 if (error_handling == ERRORS_SENDER)
3257 if (!moan_to_sender(
3258 (bad_addresses == NULL)?
3259 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3260 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3261 bad_addresses, header_list, data_file, FALSE))
3262 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3266 if (bad_addresses == NULL)
3268 if (extracted_ignored)
3269 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3271 fprintf(stderr, "exim: no recipients in message\n");
3275 fprintf(stderr, "exim: invalid address%s",
3276 (bad_addresses->next == NULL)? ":" : "es:\n");
3277 while (bad_addresses != NULL)
3279 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3280 bad_addresses->text2);
3281 bad_addresses = bad_addresses->next;
3286 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3288 Uunlink(spool_name);
3289 (void)fclose(data_file);
3290 exim_exit(error_rc);
3294 /* Data file successfully written. Generate text for the Received: header by
3295 expanding the configured string, and adding a timestamp. By leaving this
3296 operation till now, we ensure that the timestamp is the time that message
3297 reception was completed. However, this is deliberately done before calling the
3298 data ACL and local_scan().
3300 This Received: header may therefore be inspected by the data ACL and by code in
3301 the local_scan() function. When they have run, we update the timestamp to be
3302 the final time of reception.
3304 If there is just one recipient, set up its value in the $received_for variable
3305 for use when we generate the Received: header.
3307 Note: the checking for too many Received: headers is handled by the delivery
3309 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3311 if (received_header->text == NULL) /* Non-cutthrough case */
3313 received_header_gen();
3315 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3317 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3318 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3320 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3321 now, before running the DATA ACL. */
3323 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3326 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3327 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3329 /* If an ACL is specified for checking things at this stage of reception of a
3330 message, run it, unless all the recipients were removed by "discard" in earlier
3331 ACLs. That is the only case in which recipients_count can be zero at this
3332 stage. Set deliver_datafile to point to the data file so that $message_body and
3333 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3336 deliver_datafile = data_fd;
3339 enable_dollar_recipients = TRUE;
3341 if (recipients_count == 0)
3342 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3346 /* Handle interactive SMTP messages */
3348 if (smtp_input && !smtp_batched_input)
3351 #ifndef DISABLE_DKIM
3352 if (!dkim_disable_verify)
3354 /* Finish verification, this will log individual signature results to
3356 dkim_exim_verify_finish();
3358 /* Check if we must run the DKIM ACL */
3359 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3361 uschar *dkim_verify_signers_expanded =
3362 expand_string(dkim_verify_signers);
3363 if (!dkim_verify_signers_expanded)
3364 log_write(0, LOG_MAIN|LOG_PANIC,
3365 "expansion of dkim_verify_signers option failed: %s",
3366 expand_string_message);
3371 const uschar *ptr = dkim_verify_signers_expanded;
3372 uschar *item = NULL;
3373 uschar *seen_items = NULL;
3374 int seen_items_size = 0;
3375 int seen_items_offset = 0;
3376 /* Default to OK when no items are present */
3378 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3380 /* Prevent running ACL for an empty item */
3381 if (!item || !*item) continue;
3383 /* Only run ACL once for each domain or identity,
3384 no matter how often it appears in the expanded list. */
3387 uschar *seen_item = NULL;
3388 const uschar *seen_items_list = seen_items;
3389 BOOL seen_this_item = FALSE;
3391 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3393 if (Ustrcmp(seen_item,item) == 0)
3395 seen_this_item = TRUE;
3402 debug_printf("acl_smtp_dkim: skipping signer %s, "
3403 "already seen\n", item);
3407 seen_items = string_append(seen_items, &seen_items_size,
3408 &seen_items_offset, 1, ":");
3411 seen_items = string_append(seen_items, &seen_items_size,
3412 &seen_items_offset, 1, item);
3413 seen_items[seen_items_offset] = '\0';
3416 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3419 dkim_exim_acl_setup(item);
3420 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3421 &user_msg, &log_msg);
3426 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3427 "skipping remaining items\n", rc, item);
3428 cancel_cutthrough_connection("dkim acl not ok");
3432 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3435 recipients_count = 0;
3436 blackholed_by = US"DKIM ACL";
3437 if (log_msg != NULL)
3438 blackhole_log_msg = string_sprintf(": %s", log_msg);
3442 Uunlink(spool_name);
3443 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3444 smtp_yield = FALSE; /* No more messages after dropped connection */
3445 smtp_reply = US""; /* Indicate reply already sent */
3446 message_id[0] = 0; /* Indicate no message accepted */
3447 goto TIDYUP; /* Skip to end of function */
3452 #endif /* DISABLE_DKIM */
3454 #ifdef WITH_CONTENT_SCAN
3455 if (recipients_count > 0 &&
3456 acl_smtp_mime != NULL &&
3457 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3459 #endif /* WITH_CONTENT_SCAN */
3461 #ifdef EXPERIMENTAL_DMARC
3462 dmarc_up = dmarc_store_data(from_header);
3463 #endif /* EXPERIMENTAL_DMARC */
3465 #ifndef DISABLE_PRDR
3466 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3470 int all_fail = FAIL;
3472 smtp_printf("353 PRDR content analysis beginning\r\n");
3473 /* Loop through recipients, responses must be in same order received */
3474 for (c = 0; recipients_count > c; c++)
3476 uschar * addr= recipients_list[c].address;
3477 uschar * msg= US"PRDR R=<%s> %s";
3480 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3481 addr, c+1, recipients_count);
3482 rc = acl_check(ACL_WHERE_PRDR, addr,
3483 acl_smtp_data_prdr, &user_msg, &log_msg);
3485 /* If any recipient rejected content, indicate it in final message */
3487 /* If all recipients rejected, indicate in final message */
3492 case OK: case DISCARD: code = US"250"; break;
3493 case DEFER: code = US"450"; break;
3494 default: code = US"550"; break;
3496 if (user_msg != NULL)
3497 smtp_user_msg(code, user_msg);
3502 case OK: case DISCARD:
3503 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3505 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3507 msg = string_sprintf(CS msg, addr, "refusal"); break;
3509 smtp_user_msg(code, msg);
3511 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3512 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3513 else log_write(0, LOG_MAIN, "%s", CS msg);
3515 if (rc != OK) { receive_remove_recipient(addr); c--; }
3517 /* Set up final message, used if data acl gives OK */
3518 smtp_reply = string_sprintf("%s id=%s message %s",
3519 all_fail == FAIL ? US"550" : US"250",
3522 ? US"rejected for all recipients"
3525 : US"accepted for some recipients");
3526 if (recipients_count == 0)
3528 message_id[0] = 0; /* Indicate no message accepted */
3533 prdr_requested = FALSE;
3534 #endif /* !DISABLE_PRDR */
3536 /* Check the recipients count again, as the MIME ACL might have changed
3539 if (acl_smtp_data != NULL && recipients_count > 0)
3541 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3542 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3545 recipients_count = 0;
3546 blackholed_by = US"DATA ACL";
3547 if (log_msg != NULL)
3548 blackhole_log_msg = string_sprintf(": %s", log_msg);
3549 cancel_cutthrough_connection("data acl discard");
3553 Uunlink(spool_name);
3554 cancel_cutthrough_connection("data acl not ok");
3555 #ifdef WITH_CONTENT_SCAN
3558 #ifdef EXPERIMENTAL_DCC
3561 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3562 smtp_yield = FALSE; /* No more messages after dropped connection */
3563 smtp_reply = US""; /* Indicate reply already sent */
3564 message_id[0] = 0; /* Indicate no message accepted */
3565 goto TIDYUP; /* Skip to end of function */
3570 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3571 we cannot take different actions for permanent and temporary rejections. */
3576 #ifdef WITH_CONTENT_SCAN
3577 if (acl_not_smtp_mime != NULL &&
3578 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3581 #endif /* WITH_CONTENT_SCAN */
3583 if (acl_not_smtp != NULL)
3585 uschar *user_msg, *log_msg;
3586 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3589 recipients_count = 0;
3590 blackholed_by = US"non-SMTP ACL";
3591 if (log_msg != NULL)
3592 blackhole_log_msg = string_sprintf(": %s", log_msg);
3596 Uunlink(spool_name);
3597 #ifdef WITH_CONTENT_SCAN
3600 #ifdef EXPERIMENTAL_DCC
3603 /* The ACL can specify where rejections are to be logged, possibly
3604 nowhere. The default is main and reject logs. */
3606 if (log_reject_target != 0)
3607 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3608 sender_address, log_msg);
3610 if (user_msg == NULL) user_msg = US"local configuration problem";
3611 if (smtp_batched_input)
3613 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3614 /* Does not return */
3618 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3619 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3620 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3622 /* Does not return */
3625 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3629 /* The applicable ACLs have been run */
3631 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3632 if (queue_only_policy) queued_by = US"ACL";
3635 #ifdef WITH_CONTENT_SCAN
3639 #ifdef EXPERIMENTAL_DCC
3644 /* The final check on the message is to run the scan_local() function. The
3645 version supplied with Exim always accepts, but this is a hook for sysadmins to
3646 supply their own checking code. The local_scan() function is run even when all
3647 the recipients have been discarded. */
3649 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3651 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3652 deleted, and the incident gets logged. */
3654 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3655 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3656 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3657 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3659 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3660 local_scan_timeout);
3661 local_scan_data = NULL;
3663 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3664 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3665 rc = local_scan(data_fd, &local_scan_data);
3667 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3669 enable_dollar_recipients = FALSE;
3671 store_pool = POOL_MAIN; /* In case changed */
3672 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3675 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3676 os_non_restarting_signal(SIGFPE, SIG_DFL);
3677 os_non_restarting_signal(SIGILL, SIG_DFL);
3678 os_non_restarting_signal(SIGBUS, SIG_DFL);
3680 /* The length check is paranoia against some runaway code, and also because
3681 (for a success return) lines in the spool file are read into big_buffer. */
3683 if (local_scan_data != NULL)
3685 int len = Ustrlen(local_scan_data);
3686 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3687 local_scan_data = string_copyn(local_scan_data, len);
3690 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3692 if (!deliver_freeze) /* ACL might have already frozen */
3694 deliver_freeze = TRUE;
3695 deliver_frozen_at = time(NULL);
3696 frozen_by = US"local_scan()";
3698 rc = LOCAL_SCAN_ACCEPT;
3700 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3702 if (!queue_only_policy) /* ACL might have already queued */
3704 queue_only_policy = TRUE;
3705 queued_by = US"local_scan()";
3707 rc = LOCAL_SCAN_ACCEPT;
3710 /* Message accepted: remove newlines in local_scan_data because otherwise
3711 the spool file gets corrupted. Ensure that all recipients are qualified. */
3713 if (rc == LOCAL_SCAN_ACCEPT)
3715 if (local_scan_data != NULL)
3718 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3720 for (i = 0; i < recipients_count; i++)
3722 recipient_item *r = recipients_list + i;
3723 r->address = rewrite_address_qualify(r->address, TRUE);
3724 if (r->errors_to != NULL)
3725 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3727 if (recipients_count == 0 && blackholed_by == NULL)
3728 blackholed_by = US"local_scan";
3731 /* Message rejected: newlines permitted in local_scan_data to generate
3732 multiline SMTP responses. */
3736 uschar *istemp = US"";
3742 errmsg = local_scan_data;
3744 Uunlink(spool_name); /* Cancel this message */
3748 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3749 "rejection given", rc);
3752 case LOCAL_SCAN_REJECT_NOLOGHDR:
3753 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3756 case LOCAL_SCAN_REJECT:
3757 smtp_code = US"550";
3758 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3761 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3762 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3765 case LOCAL_SCAN_TEMPREJECT:
3767 smtp_code = US"451";
3768 if (errmsg == NULL) errmsg = US"Temporary local problem";
3769 istemp = US"temporarily ";
3773 s = string_append(s, &size, &sptr, 2, US"F=",
3774 (sender_address[0] == 0)? US"<>" : sender_address);
3775 s = add_host_info_for_log(s, &size, &sptr);
3778 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3779 s, istemp, string_printing(errmsg));
3783 if (!smtp_batched_input)
3785 smtp_respond(smtp_code, 3, TRUE, errmsg);
3786 message_id[0] = 0; /* Indicate no message accepted */
3787 smtp_reply = US""; /* Indicate reply already sent */
3788 goto TIDYUP; /* Skip to end of function */
3792 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3793 /* Does not return */
3798 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3799 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3800 US"message rejected by local scan code: ", error_rc, data_file,
3802 /* Does not return */
3806 /* Reset signal handlers to ignore signals that previously would have caused
3807 the message to be abandoned. */
3809 signal(SIGTERM, SIG_IGN);
3810 signal(SIGINT, SIG_IGN);
3813 /* Ensure the first time flag is set in the newly-received message. */
3815 deliver_firsttime = TRUE;
3817 #ifdef EXPERIMENTAL_BRIGHTMAIL
3819 { /* rewind data file */
3820 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3821 bmi_verdicts = bmi_process_message(header_list, data_fd);
3825 /* Update the timestamp in our Received: header to account for any time taken by
3826 an ACL or by local_scan(). The new time is the time that all reception
3827 processing is complete. */
3829 timestamp = expand_string(US"${tod_full}");
3830 tslen = Ustrlen(timestamp);
3832 memcpy(received_header->text + received_header->slen - tslen - 1,
3835 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3839 deliver_freeze = FALSE;
3840 queue_only_policy = FALSE;
3843 /* Keep the data file open until we have written the header file, in order to
3844 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3845 don't write the header file, and we unlink the data file. If writing the header
3846 file fails, we have failed to accept this message. */
3848 if (host_checking || blackholed_by != NULL)
3851 Uunlink(spool_name);
3852 msg_size = 0; /* Compute size for log line */
3853 for (h = header_list; h != NULL; h = h->next)
3854 if (h->type != '*') msg_size += h->slen;
3857 /* Write the -H file */
3860 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3862 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3863 Uunlink(spool_name); /* Lose the data file */
3867 smtp_reply = US"451 Error in writing spool file";
3868 message_id[0] = 0; /* Indicate no message accepted */
3873 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3874 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3876 /* Does not return */
3881 /* The message has now been successfully received. */
3883 receive_messagecount++;
3885 /* In SMTP sessions we may receive several in one connection. After each one,
3886 we wait for the clock to tick at the level of message-id granularity. This is
3887 so that the combination of time+pid is unique, even on systems where the pid
3888 can be re-used within our time interval. We can't shorten the interval without
3889 re-designing the message-id. See comments above where the message id is
3890 created. This is Something For The Future. */
3892 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3893 exim_wait_tick(&message_id_tv, id_resolution);
3895 /* Add data size to written header size. We do not count the initial file name
3896 that is in the file, but we do add one extra for the notional blank line that
3897 precedes the data. This total differs from message_size in that it include the
3898 added Received: header and any other headers that got created locally. */
3901 fstat(data_fd, &statbuf);
3903 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3905 /* Generate a "message received" log entry. We do this by building up a dynamic
3906 string as required. Since we commonly want to add two items at a time, use a
3907 macro to simplify the coding. We log the arrival of a new message while the
3908 file is still locked, just in case the machine is *really* fast, and delivers
3909 it first! Include any message id that is in the message - since the syntax of a
3910 message id is actually an addr-spec, we can use the parse routine to canonicalize
3915 s = store_get(size);
3917 s = string_append(s, &size, &sptr, 2,
3918 fake_response == FAIL ? US"(= " : US"<= ",
3919 sender_address[0] == 0 ? US"<>" : sender_address);
3920 if (message_reference)
3921 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3923 s = add_host_info_for_log(s, &size, &sptr);
3926 if (LOGGING(tls_cipher) && tls_in.cipher)
3927 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3928 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3929 s = string_append(s, &size, &sptr, 2, US" CV=",
3930 tls_in.certificate_verified ? "yes":"no");
3931 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3932 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3933 string_printing(tls_in.peerdn), US"\"");
3934 if (LOGGING(tls_sni) && tls_in.sni)
3935 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3936 string_printing(tls_in.sni), US"\"");
3939 if (sender_host_authenticated)
3941 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3942 if (authenticated_id)
3944 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3945 if (LOGGING(smtp_mailauth) && authenticated_sender)
3946 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3950 #ifndef DISABLE_PRDR
3952 s = string_catn(s, &size, &sptr, US" PRDR", 5);
3955 #ifdef SUPPORT_PROXY
3956 if (proxy_session && LOGGING(proxy))
3957 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3960 if (chunking_state > CHUNKING_OFFERED)
3961 s = string_catn(s, &size, &sptr, US" K", 2);
3963 sprintf(CS big_buffer, "%d", msg_size);
3964 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3966 /* log 8BITMIME mode announced in MAIL_FROM
3970 if (LOGGING(8bitmime))
3972 sprintf(CS big_buffer, "%d", body_8bitmime);
3973 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3977 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
3979 /* If an addr-spec in a message-id contains a quoted string, it can contain
3980 any characters except " \ and CR and so in particular it can contain NL!
3981 Therefore, make sure we use a printing-characters only version for the log.
3982 Also, allow for domain literals in the message id. */
3987 BOOL save_allow_domain_literals = allow_domain_literals;
3988 allow_domain_literals = TRUE;
3989 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3990 &errmsg, &start, &end, &domain, FALSE);
3991 allow_domain_literals = save_allow_domain_literals;
3993 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3996 /* If subject logging is turned on, create suitable printing-character
3997 text. By expanding $h_subject: we make use of the MIME decoding. */
3999 if (LOGGING(subject) && subject_header != NULL)
4002 uschar *p = big_buffer;
4003 uschar *ss = expand_string(US"$h_subject:");
4005 /* Backslash-quote any double quotes or backslashes so as to make a
4006 a C-like string, and turn any non-printers into escape sequences. */
4009 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4011 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4016 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
4019 /* Terminate the string: string_cat() and string_append() leave room, but do
4020 not put the zero in. */
4024 /* Create a message log file if message logs are being used and this message is
4025 not blackholed. Write the reception stuff to it. We used to leave message log
4026 creation until the first delivery, but this has proved confusing for some
4029 if (message_logs && blackholed_by == NULL)
4033 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4035 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4039 (void)directory_make(spool_directory,
4040 spool_sname(US"msglog", message_subdir),
4041 MSGLOG_DIRECTORY_MODE, TRUE);
4042 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4047 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4048 spool_name, strerror(errno));
4053 FILE *message_log = fdopen(fd, "a");
4054 if (message_log == NULL)
4056 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4057 spool_name, strerror(errno));
4062 uschar *now = tod_stamp(tod_log);
4063 fprintf(message_log, "%s Received from %s\n", now, s+3);
4064 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4066 if (queue_only_policy) fprintf(message_log,
4067 "%s no immediate delivery: queued%s%s by %s\n", now,
4068 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4070 (void)fclose(message_log);
4075 /* Everything has now been done for a successful message except logging its
4076 arrival, and outputting an SMTP response. While writing to the log, set a flag
4077 to cause a call to receive_bomb_out() if the log cannot be opened. */
4079 receive_call_bombout = TRUE;
4081 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4082 connection has gone away. This can only be done if there is no unconsumed input
4083 waiting in the local input buffer. We can test for this by calling
4084 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4085 input to be sent following the final dot, so the presence of following input is
4088 If the connection is still present, but there is no unread input for the
4089 socket, the result of a select() call will be zero. If, however, the connection
4090 has gone away, or if there is pending input, the result of select() will be
4091 non-zero. The two cases can be distinguished by trying to read the next input
4092 character. If we succeed, we can unread it so that it remains in the local
4093 buffer for handling later. If not, the connection has been lost.
4095 Of course, since TCP/IP is asynchronous, there is always a chance that the
4096 connection will vanish between the time of this test and the sending of the
4097 response, but the chance of this happening should be small. */
4099 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4100 !receive_smtp_buffered())
4103 fd_set select_check;
4104 FD_ZERO(&select_check);
4105 FD_SET(fileno(smtp_in), &select_check);
4109 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4111 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4112 if (c != EOF) (receive_ungetc)(c); else
4114 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4115 smtp_reply = US""; /* No attempt to send a response */
4116 smtp_yield = FALSE; /* Nothing more on this connection */
4118 /* Re-use the log line workspace */
4121 s = string_cat(s, &size, &sptr, US"SMTP connection lost after final dot");
4122 s = add_host_info_for_log(s, &size, &sptr);
4124 log_write(0, LOG_MAIN, "%s", s);
4126 /* Delete the files for this aborted message. */
4128 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4129 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4130 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4137 /* The connection has not gone away; we really are going to take responsibility
4138 for this message. */
4140 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4143 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4144 the sender's dot (below).
4145 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4146 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4147 in which case pass temp-reject back to initiator and dump the files.
4149 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4151 XXX We do not handle queue-only, freezing, or blackholes.
4153 if(cutthrough.fd >= 0)
4155 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the message */
4156 /* Logging was done in finaldot() */
4159 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4160 cutthrough_done = ACCEPTED;
4161 break; /* message_id needed for SMTP accept below */
4163 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4164 ... for which, pass back the exact error */
4165 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4168 default: /* Unknown response, or error. Treat as temp-reject. */
4169 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4170 break; /* message_id needed for SMTP accept below */
4172 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4173 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4174 cutthrough_done = PERM_REJ;
4179 #ifndef DISABLE_PRDR
4180 if(!smtp_reply || prdr_requested)
4185 log_write(0, LOG_MAIN |
4186 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4187 (LOGGING(received_sender)? LOG_SENDER : 0),
4190 /* Log any control actions taken by an ACL or local_scan(). */
4192 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4193 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4194 "no immediate delivery: queued%s%s by %s",
4195 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4198 receive_call_bombout = FALSE;
4200 store_reset(s); /* The store for the main log message can be reused */
4202 /* If the message is frozen, and freeze_tell is set, do the telling. */
4204 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4206 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4207 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4208 message_id, frozen_by, sender_address);
4212 /* Either a message has been successfully received and written to the two spool
4213 files, or an error in writing the spool has occurred for an SMTP message, or
4214 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4215 we will have already given up because there's no point in carrying on!) In
4216 either event, we must now close (and thereby unlock) the data file. In the
4217 successful case, this leaves the message on the spool, ready for delivery. In
4218 the error case, the spool file will be deleted. Then tidy up store, interact
4219 with an SMTP call if necessary, and return.
4221 A fflush() was done earlier in the expectation that any write errors on the
4222 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4223 possible for fclose() to fail - but what to do? What has happened to the lock
4228 process_info[process_info_len] = 0; /* Remove message id */
4229 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4231 /* Now reset signal handlers to their defaults */
4233 signal(SIGTERM, SIG_DFL);
4234 signal(SIGINT, SIG_DFL);
4236 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4237 value, which defaults TRUE - meaning there may be more incoming messages from
4238 this connection. For non-SMTP callers (where there is only ever one message),
4239 the default is FALSE. */
4245 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4246 is set to the response that should be sent. When it is NULL, we generate
4247 default responses. After an ACL error or local_scan() error, the response has
4248 already been sent, and smtp_reply is an empty string to indicate this. */
4250 if (!smtp_batched_input)
4254 if (fake_response != OK)
4255 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4256 3, TRUE, fake_response_text);
4258 /* An OK response is required; use "message" text if present. */
4262 uschar *code = US"250";
4264 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4265 smtp_respond(code, len, TRUE, user_msg);
4268 /* Default OK response */
4270 else if (chunking_state > CHUNKING_OFFERED)
4272 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4273 chunking_datasize, message_size+message_linecount, message_id);
4274 chunking_state = CHUNKING_OFFERED;
4277 smtp_printf("250 OK id=%s\r\n", message_id);
4281 "\n**** SMTP testing: that is not a real message id!\n\n");
4284 /* smtp_reply is set non-empty */
4286 else if (smtp_reply[0] != 0)
4287 if (fake_response != OK && (smtp_reply[0] == '2'))
4288 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4289 fake_response_text);
4291 smtp_printf("%.1024s\r\n", smtp_reply);
4293 switch (cutthrough_done)
4296 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4298 /* Delete spool files */
4299 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4300 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4301 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4302 message_id[0] = 0; /* Prevent a delivery from starting */
4306 if (cutthrough.defer_pass)
4308 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4309 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4310 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4312 message_id[0] = 0; /* Prevent a delivery from starting */
4316 cutthrough.delivery = FALSE;
4317 cutthrough.defer_pass = FALSE;
4320 /* For batched SMTP, generate an error message on failure, and do
4321 nothing on success. The function moan_smtp_batch() does not return -
4322 it exits from the program with a non-zero return code. */
4324 else if (smtp_reply)
4325 moan_smtp_batch(NULL, "%s", smtp_reply);
4329 /* If blackholing, we can immediately log this message's sad fate. The data
4330 file has already been unlinked, and the header file was never written to disk.
4331 We must now indicate that nothing was received, to prevent a delivery from
4336 const uschar *detail = local_scan_data
4337 ? string_printing(local_scan_data)
4338 : string_sprintf("(%s discarded recipients)", blackholed_by);
4339 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4340 log_write(0, LOG_MAIN, "Completed");
4344 /* Reset headers so that logging of rejects for a subsequent message doesn't
4345 include them. It is also important to set header_last = NULL before exiting
4346 from this function, as this prevents certain rewrites that might happen during
4347 subsequent verifying (of another incoming message) from trying to add headers
4348 when they shouldn't. */
4350 header_list = header_last = NULL;
4352 return yield; /* TRUE if more messages (SMTP only) */
4355 /* End of receive.c */