Fix incorrect use of local user name for trusted submissions.
[exim.git] / src / src / receive.c
CommitLineData
2fe1a124 1/* $Cambridge: exim/src/src/receive.c,v 1.23 2005/09/07 10:15:33 ph10 Exp $ */
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2
3/*************************************************
4* Exim - an Internet mail transport agent *
5*************************************************/
6
c988f1f4 7/* Copyright (c) University of Cambridge 1995 - 2005 */
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8/* See the file NOTICE for conditions of use and distribution. */
9
10/* Code for receiving a message and setting up spool files. */
11
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12#include "exim.h"
13
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14#ifdef EXPERIMENTAL_DOMAINKEYS
15#define RECEIVE_GETC dk_receive_getc
16#define RECEIVE_UNGETC dk_receive_ungetc
17#else
18#define RECEIVE_GETC receive_getc
19#define RECEIVE_UNGETC receive_ungetc
20#endif
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21
22/*************************************************
23* Local static variables *
24*************************************************/
25
26static FILE *data_file = NULL;
27static int data_fd = -1;
28static uschar spool_name[256];
29
30
31
32/*************************************************
33* Non-SMTP character reading functions *
34*************************************************/
35
36/* These are the default functions that are set up in the variables such as
37receive_getc initially. They just call the standard functions, passing stdin as
38the file. (When SMTP input is occurring, different functions are used by
39changing the pointer variables.) */
40
41int
42stdin_getc(void)
43{
44return getc(stdin);
45}
46
47int
48stdin_ungetc(int c)
49{
50return ungetc(c, stdin);
51}
52
53int
54stdin_feof(void)
55{
56return feof(stdin);
57}
58
59int
60stdin_ferror(void)
61{
62return ferror(stdin);
63}
64
65
66
67
68/*************************************************
69* Check that a set sender is allowed *
70*************************************************/
71
72/* This function is called when a local caller sets an explicit sender address.
73It checks whether this is permitted, which it is for trusted callers.
74Otherwise, it must match the pattern(s) in untrusted_set_sender.
75
76Arguments: the proposed sender address
77Returns: TRUE for a trusted caller
78 TRUE if the address has been set, untrusted_set_sender has been
79 set, and the address matches something in the list
80 FALSE otherwise
81*/
82
83BOOL
84receive_check_set_sender(uschar *newsender)
85{
86uschar *qnewsender;
87if (trusted_caller) return TRUE;
88if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
89qnewsender = (Ustrchr(newsender, '@') != NULL)?
90 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
91return
92 match_address_list(qnewsender, TRUE, TRUE, &untrusted_set_sender, NULL, -1,
93 0, NULL) == OK;
94}
95
96
97
98
99/*************************************************
5cb8cbc6 100* Read space info for a partition *
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101*************************************************/
102
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103/* This function is called by receive_check_fs() below, and also by string
104expansion for variables such as $spool_space. The field names for the statvfs
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105structure are macros, because not all OS have F_FAVAIL and it seems tidier to
106have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
107have inodes, and they return -1 for the number available.
059ec3d9 108
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109Later: It turns out that some file systems that do not have the concept of
110inodes return 0 rather than -1. Such systems should also return 0 for the total
8e669ac1 111number of inodes, so we require that to be greater than zero before returning
5cb8cbc6 112an inode count.
059ec3d9 113
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114Arguments:
115 isspool TRUE for spool partition, FALSE for log partition
116 inodeptr address of int to receive inode count; -1 if there isn't one
8e669ac1 117
5cb8cbc6 118Returns: available on-root space, in kilobytes
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119 -1 for log partition if there isn't one
120
121All values are -1 if the STATFS functions are not available.
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122*/
123
8e669ac1 124int
5cb8cbc6 125receive_statvfs(BOOL isspool, int *inodeptr)
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126{
127#ifdef HAVE_STATFS
059ec3d9 128struct STATVFS statbuf;
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129uschar *path;
130uschar *name;
131uschar buffer[1024];
059ec3d9 132
5cb8cbc6 133/* The spool directory must always exist. */
059ec3d9 134
5cb8cbc6 135if (isspool)
059ec3d9 136 {
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137 path = spool_directory;
138 name = US"spool";
139 }
140
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141/* Need to cut down the log file path to the directory, and to ignore any
142appearance of "syslog" in it. */
143
5cb8cbc6 144else
059ec3d9 145 {
059ec3d9 146 int sep = ':'; /* Not variable - outside scripts use */
059ec3d9 147 uschar *p = log_file_path;
8e669ac1 148 name = US"log";
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149
150 /* An empty log_file_path means "use the default". This is the same as an
151 empty item in a list. */
152
153 if (*p == 0) p = US":";
154 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))) != NULL)
155 {
156 if (Ustrcmp(path, "syslog") != 0) break;
157 }
158
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159 if (path == NULL) /* No log files */
160 {
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161 *inodeptr = -1;
162 return -1;
163 }
059ec3d9 164
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165 /* An empty string means use the default, which is in the spool directory.
166 But don't just use the spool directory, as it is possible that the log
5cb8cbc6 167 subdirectory has been symbolically linked elsewhere. */
059ec3d9 168
8e669ac1 169 if (path[0] == 0)
059ec3d9 170 {
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171 sprintf(CS buffer, CS"%s/log", CS spool_directory);
172 path = buffer;
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173 }
174 else
059ec3d9 175 {
8e669ac1 176 uschar *cp;
5cb8cbc6 177 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
8e669ac1 178 }
5cb8cbc6 179 }
8e669ac1 180
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181/* We now have the patch; do the business */
182
183memset(&statbuf, 0, sizeof(statbuf));
184
185if (STATVFS(CS path, &statbuf) != 0)
186 {
187 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
188 "%s directory %s: %s", name, spool_directory, strerror(errno));
189 smtp_closedown(US"spool or log directory problem");
190 exim_exit(EXIT_FAILURE);
191 }
8e669ac1 192
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193*inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
194
195/* Disks are getting huge. Take care with computing the size in kilobytes. */
8e669ac1 196
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197return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
198
199/* Unable to find partition sizes in this environment. */
200
201#else
202*inodeptr = -1;
203return -1;
204#endif
205}
206
059ec3d9 207
059ec3d9 208
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209
210/*************************************************
211* Check space on spool and log partitions *
212*************************************************/
213
214/* This function is called before accepting a message; if any thresholds are
215set, it checks them. If a message_size is supplied, it checks that there is
216enough space for that size plus the threshold - i.e. that the message won't
217reduce the space to the threshold. Not all OS have statvfs(); for those that
218don't, this function always returns TRUE. For some OS the old function and
219struct name statfs is used; that is handled by a macro, defined in exim.h.
220
221Arguments:
222 msg_size the (estimated) size of an incoming message
223
224Returns: FALSE if there isn't enough space, or if the information cannot
225 be obtained
226 TRUE if no check was done or there is enough space
227*/
228
229BOOL
230receive_check_fs(int msg_size)
231{
232int space, inodes;
233
234if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
235 {
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236 space = receive_statvfs(TRUE, &inodes);
237
059ec3d9 238 DEBUG(D_receive)
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239 debug_printf("spool directory space = %dK inodes = %d "
240 "check_space = %dK inodes = %d msg_size = %d\n",
241 space, inodes, check_spool_space, check_spool_inodes, msg_size);
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242
243 if ((space >= 0 && space < check_spool_space) ||
5cb8cbc6 244 (inodes >= 0 && inodes < check_spool_inodes))
8e669ac1 245 {
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246 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
247 "inodes=%d", space, inodes);
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248 return FALSE;
249 }
250 }
251
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252if (check_log_space > 0 || check_log_inodes > 0)
253 {
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254 space = receive_statvfs(FALSE, &inodes);
255
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256 DEBUG(D_receive)
257 debug_printf("log directory space = %dK inodes = %d "
258 "check_space = %dK inodes = %d\n",
259 space, inodes, check_log_space, check_log_inodes);
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260
261 if ((space >= 0 && space < check_log_space) ||
5cb8cbc6 262 (inodes >= 0 && inodes < check_log_inodes))
8e669ac1 263 {
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264 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
265 "inodes=%d", space, inodes);
266 return FALSE;
267 }
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268 }
269
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270return TRUE;
271}
272
273
274
275/*************************************************
276* Bomb out while reading a message *
277*************************************************/
278
279/* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
280received, or if there is a timeout. A rarer case might be if the log files are
281screwed up and Exim can't open them to record a message's arrival. Handling
282that case is done by setting a flag to cause the log functions to call this
283function if there is an ultimate disaster. That is why it is globally
284accessible.
285
286Arguments: SMTP response to give if in an SMTP session
287Returns: it doesn't
288*/
289
290void
291receive_bomb_out(uschar *msg)
292{
293/* If spool_name is set, it contains the name of the data file that is being
294written. Unlink it before closing so that it cannot be picked up by a delivery
295process. Ensure that any header file is also removed. */
296
297if (spool_name[0] != 0)
298 {
299 Uunlink(spool_name);
300 spool_name[Ustrlen(spool_name) - 1] = 'H';
301 Uunlink(spool_name);
302 }
303
304/* Now close the file if it is open, either as a fd or a stream. */
305
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306if (data_file != NULL) (void)fclose(data_file);
307 else if (data_fd >= 0) (void)close(data_fd);
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308
309/* Attempt to close down an SMTP connection tidily. */
310
311if (smtp_input)
312 {
313 if (!smtp_batched_input)
314 {
315 smtp_printf("421 %s %s - closing connection.\r\n", smtp_active_hostname,
316 msg);
317 mac_smtp_fflush();
318 }
319
320 /* Control does not return from moan_smtp_batch(). */
321
322 else moan_smtp_batch(NULL, "421 %s - message abandoned", msg);
323 }
324
325/* Exit from the program (non-BSMTP cases) */
326
327exim_exit(EXIT_FAILURE);
328}
329
330
331/*************************************************
332* Data read timeout *
333*************************************************/
334
335/* Handler function for timeouts that occur while reading the data that
336comprises a message.
337
338Argument: the signal number
339Returns: nothing
340*/
341
342static void
343data_timeout_handler(int sig)
344{
345uschar *msg = NULL;
346
347sig = sig; /* Keep picky compilers happy */
348
349if (smtp_input)
350 {
351 msg = US"SMTP incoming data timeout";
352 log_write(L_lost_incoming_connection,
353 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
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354 "from %s F=<%s>",
355 (sender_fullhost != NULL)? sender_fullhost : US"local process",
356 sender_address);
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357 }
358else
359 {
360 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
361 log_write(L_lost_incoming_connection,
362 LOG_MAIN, "timed out while reading local message");
363 }
364
365receive_bomb_out(msg); /* Does not return */
366}
367
368
369
370/*************************************************
371* local_scan() timeout *
372*************************************************/
373
374/* Handler function for timeouts that occur while running a local_scan()
375function.
376
377Argument: the signal number
378Returns: nothing
379*/
380
381static void
382local_scan_timeout_handler(int sig)
383{
384sig = sig; /* Keep picky compilers happy */
385log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
386 "message temporarily rejected (size %d)", message_size);
387receive_bomb_out(US"local verification problem"); /* Does not return */
388}
389
390
391
392/*************************************************
393* local_scan() crashed *
394*************************************************/
395
396/* Handler function for signals that occur while running a local_scan()
397function.
398
399Argument: the signal number
400Returns: nothing
401*/
402
403static void
404local_scan_crash_handler(int sig)
405{
406log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
407 "signal %d - message temporarily rejected (size %d)", sig, message_size);
408receive_bomb_out(US"local verification problem"); /* Does not return */
409}
410
411
412/*************************************************
413* SIGTERM or SIGINT received *
414*************************************************/
415
416/* Handler for SIGTERM or SIGINT signals that occur while reading the
417data that comprises a message.
418
419Argument: the signal number
420Returns: nothing
421*/
422
423static void
424data_sigterm_sigint_handler(int sig)
425{
426uschar *msg = NULL;
427
428if (smtp_input)
429 {
430 msg = US"Service not available - SIGTERM or SIGINT received";
431 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
432 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
433 }
434else
435 {
f05da2e8 436 if (filter_test == FTEST_NONE)
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437 {
438 fprintf(stderr, "\nexim: %s received - message abandoned\n",
439 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
440 log_write(0, LOG_MAIN, "%s received while reading local message",
441 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
442 }
443 }
444
445receive_bomb_out(msg); /* Does not return */
446}
447
448
449
450/*************************************************
451* Add new recipient to list *
452*************************************************/
453
454/* This function builds a list of recipient addresses in argc/argv
455format.
456
457Arguments:
458 recipient the next address to add to recipients_list
459 pno parent number for fixed aliases; -1 otherwise
460
461Returns: nothing
462*/
463
464void
465receive_add_recipient(uschar *recipient, int pno)
466{
467if (recipients_count >= recipients_list_max)
468 {
469 recipient_item *oldlist = recipients_list;
470 int oldmax = recipients_list_max;
471 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
472 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
473 if (oldlist != NULL)
474 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
475 }
476
477recipients_list[recipients_count].address = recipient;
478recipients_list[recipients_count].pno = pno;
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479#ifdef EXPERIMENTAL_BRIGHTMAIL
480recipients_list[recipients_count].bmi_optin = bmi_current_optin;
481/* reset optin string pointer for next recipient */
482bmi_current_optin = NULL;
483#endif
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484recipients_list[recipients_count++].errors_to = NULL;
485}
486
487
488
489
490/*************************************************
491* Remove a recipient from the list *
492*************************************************/
493
494/* This function is provided for local_scan() to use.
495
496Argument:
497 recipient address to remove
498
499Returns: TRUE if it did remove something; FALSE otherwise
500*/
501
502BOOL
503receive_remove_recipient(uschar *recipient)
504{
505int count;
506DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
507 recipient);
508for (count = 0; count < recipients_count; count++)
509 {
510 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
511 {
512 if ((--recipients_count - count) > 0)
513 memmove(recipients_list + count, recipients_list + count + 1,
54cdb463 514 (recipients_count - count)*sizeof(recipient_item));
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515 return TRUE;
516 }
517 }
518return FALSE;
519}
520
521
522
523
524
525/*************************************************
526* Read data portion of a non-SMTP message *
527*************************************************/
528
529/* This function is called to read the remainder of a message (following the
530header) when the input is not from SMTP - we are receiving a local message on
531a standard input stream. The message is always terminated by EOF, and is also
532terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
533two cases for maximum efficiency.
534
535Ensure that the body ends with a newline. This will naturally be the case when
536the termination is "\n.\n" but may not be otherwise. The RFC defines messages
537as "sequences of lines" - this of course strictly applies only to SMTP, but
538deliveries into BSD-type mailbox files also require it. Exim used to have a
539flag for doing this at delivery time, but as it was always set for all
540transports, I decided to simplify things by putting the check here instead.
541
542There is at least one MUA (dtmail) that sends CRLF via this interface, and
543other programs are known to do this as well. Exim used to have a option for
544dealing with this: in July 2003, after much discussion, the code has been
545changed to default to treat any of LF, CRLF, and bare CR as line terminators.
546
547However, for the case when a dot on a line by itself terminates a message, the
548only recognized terminating sequences before and after the dot are LF and CRLF.
549Otherwise, having read EOL . CR, you don't know whether to read another
550character or not.
551
552Internally, in messages stored in Exim's spool files, LF is used as the line
553terminator. Under the new regime, bare CRs will no longer appear in these
554files.
555
556Arguments:
557 fout a FILE to which to write the message
558
559Returns: One of the END_xxx values indicating why it stopped reading
560*/
561
562static int
563read_message_data(FILE *fout)
564{
565int ch_state;
566register int ch;
567
568/* Handle the case when only EOF terminates the message */
569
570if (!dot_ends)
571 {
572 register int last_ch = '\n';
573
fb2274d4 574 for (; (ch = (RECEIVE_GETC)()) != EOF; last_ch = ch)
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575 {
576 if (ch == 0) body_zerocount++;
577 if (last_ch == '\r' && ch != '\n')
578 {
579 if (fputc('\n', fout) == EOF) return END_WERROR;
580 message_size++;
581 body_linecount++;
582 }
583 if (ch == '\r') continue;
584
585 if (fputc(ch, fout) == EOF) return END_WERROR;
586 if (ch == '\n') body_linecount++;
587 if (++message_size > thismessage_size_limit) return END_SIZE;
588 }
589
590 if (last_ch != '\n')
591 {
592 if (fputc('\n', fout) == EOF) return END_WERROR;
593 message_size++;
594 body_linecount++;
595 }
596
597 return END_EOF;
598 }
599
600/* Handle the case when a dot on a line on its own, or EOF, terminates. */
601
602ch_state = 1;
603
fb2274d4 604while ((ch = (RECEIVE_GETC)()) != EOF)
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605 {
606 if (ch == 0) body_zerocount++;
607 switch (ch_state)
608 {
609 case 0: /* Normal state (previous char written) */
610 if (ch == '\n')
611 { body_linecount++; ch_state = 1; }
612 else if (ch == '\r')
613 { ch_state = 2; continue; }
614 break;
615
616 case 1: /* After written "\n" */
617 if (ch == '.') { ch_state = 3; continue; }
618 if (ch != '\n') ch_state = 0;
619 break;
620
621 case 2:
622 body_linecount++; /* After unwritten "\r" */
623 if (ch == '\n')
624 { ch_state = 1; }
625 else
626 {
627 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
628 if (ch == '\r') continue;
629 ch_state = 0;
630 }
631 break;
632
633 case 3: /* After "\n." (\n written, dot not) */
634 if (ch == '\n') return END_DOT;
635 if (ch == '\r') { ch_state = 4; continue; }
636 message_size++;
637 if (fputc('.', fout) == EOF) return END_WERROR;
638 ch_state = 0;
639 break;
640
641 case 4: /* After "\n.\r" (\n written, rest not) */
642 if (ch == '\n') return END_DOT;
643 message_size += 2;
644 body_linecount++;
645 if (fputs(".\n", fout) == EOF) return END_WERROR;
646 if (ch == '\r') { ch_state = 2; continue; }
647 ch_state = 0;
648 break;
649 }
650
651 if (fputc(ch, fout) == EOF) return END_WERROR;
652 if (++message_size > thismessage_size_limit) return END_SIZE;
653 }
654
655/* Get here if EOF read. Unless we have just written "\n", we need to ensure
656the message ends with a newline, and we must also write any characters that
657were saved up while testing for an ending dot. */
658
659if (ch_state != 1)
660 {
661 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
662 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
663 message_size += Ustrlen(ends[ch_state]);
664 body_linecount++;
665 }
666
667return END_EOF;
668}
669
670
671
672
673/*************************************************
674* Read data portion of an SMTP message *
675*************************************************/
676
677/* This function is called to read the remainder of an SMTP message (after the
678headers), or to skip over it when an error has occurred. In this case, the
679output file is passed as NULL.
680
681If any line begins with a dot, that character is skipped. The input should only
682be successfully terminated by CR LF . CR LF unless it is local (non-network)
683SMTP, in which case the CRs are optional, but...
684
685FUDGE: It seems that sites on the net send out messages with just LF
686terminators, despite the warnings in the RFCs, and other MTAs handle this. So
687we make the CRs optional in all cases.
688
689July 2003: Bare CRs cause trouble. We now treat them as line terminators as
690well, so that there are no CRs in spooled messages. However, the message
691terminating dot is not recognized between two bare CRs.
692
693Arguments:
694 fout a FILE to which to write the message; NULL if skipping
695
696Returns: One of the END_xxx values indicating why it stopped reading
697*/
698
699static int
700read_message_data_smtp(FILE *fout)
701{
702int ch_state = 0;
703register int ch;
704
fb2274d4 705while ((ch = (RECEIVE_GETC)()) != EOF)
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706 {
707 if (ch == 0) body_zerocount++;
708 switch (ch_state)
709 {
710 case 0: /* After LF or CRLF */
711 if (ch == '.')
712 {
713 ch_state = 3;
714 continue; /* Don't ever write . after LF */
715 }
716 ch_state = 1;
717
718 /* Else fall through to handle as normal uschar. */
719
720 case 1: /* Normal state */
721 if (ch == '\n')
722 {
723 ch_state = 0;
724 body_linecount++;
725 }
726 else if (ch == '\r')
727 {
728 ch_state = 2;
729 continue;
730 }
731 break;
732
733 case 2: /* After (unwritten) CR */
734 body_linecount++;
735 if (ch == '\n')
736 {
737 ch_state = 0;
738 }
739 else
740 {
741 message_size++;
742 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
743 if (ch != '\r') ch_state = 1; else continue;
744 }
745 break;
746
747 case 3: /* After [CR] LF . */
748 if (ch == '\n')
749 return END_DOT;
750 if (ch == '\r')
751 {
752 ch_state = 4;
753 continue;
754 }
755 ch_state = 1; /* The dot itself is removed */
756 break;
757
758 case 4: /* After [CR] LF . CR */
759 if (ch == '\n') return END_DOT;
760 message_size++;
761 body_linecount++;
762 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
763 if (ch == '\r')
764 {
765 ch_state = 2;
766 continue;
767 }
768 ch_state = 1;
769 break;
770 }
771
772 /* Add the character to the spool file, unless skipping; then loop for the
773 next. */
774
775 message_size++;
776 if (fout != NULL)
777 {
778 if (fputc(ch, fout) == EOF) return END_WERROR;
779 if (message_size > thismessage_size_limit) return END_SIZE;
780 }
781 }
782
783/* Fall through here if EOF encountered. This indicates some kind of error,
784since a correct message is terminated by [CR] LF . [CR] LF. */
785
786return END_EOF;
787}
788
789
790
791
792/*************************************************
793* Swallow SMTP message *
794*************************************************/
795
796/* This function is called when there has been some kind of error while reading
797an SMTP message, and the remaining data may need to be swallowed. It is global
798because it is called from smtp_closedown() to shut down an incoming call
799tidily.
800
801Argument: a FILE from which to read the message
802Returns: nothing
803*/
804
805void
806receive_swallow_smtp(void)
807{
808if (message_ended >= END_NOTENDED)
809 message_ended = read_message_data_smtp(NULL);
810}
811
812
813
814/*************************************************
815* Handle lost SMTP connection *
816*************************************************/
817
818/* This function logs connection loss incidents and generates an appropriate
819SMTP response.
820
821Argument: additional data for the message
822Returns: the SMTP response
823*/
824
825static uschar *
826handle_lost_connection(uschar *s)
827{
828log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
829 "%s lost while reading message data%s", smtp_get_connection_info(), s);
830return US"421 Lost incoming connection";
831}
832
833
834
835
836/*************************************************
837* Handle a non-smtp reception error *
838*************************************************/
839
840/* This function is called for various errors during the reception of non-SMTP
841messages. It either sends a message to the sender of the problem message, or it
842writes to the standard error stream.
843
844Arguments:
845 errcode code for moan_to_sender(), identifying the error
846 text1 first message text, passed to moan_to_sender()
847 text2 second message text, used only for stderrr
848 error_rc code to pass to exim_exit if no problem
849 f FILE containing body of message (may be stdin)
850 hptr pointer to instore headers or NULL
851
852Returns: calls exim_exit(), which does not return
853*/
854
855static void
856give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
857 FILE *f, header_line *hptr)
858{
859if (error_handling == ERRORS_SENDER)
860 {
861 error_block eblock;
862 eblock.next = NULL;
863 eblock.text1 = text1;
864 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
865 error_rc = EXIT_FAILURE;
866 }
867else fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
f1e894f3 868(void)fclose(f);
059ec3d9
PH
869exim_exit(error_rc);
870}
871
872
873
874/*************************************************
875* Add header lines set up by ACL *
876*************************************************/
877
878/* This function is called to add the header lines that were set up by "warn"
879statements in an ACL onto the list of headers in memory. It is done in two
880stages like this, because when the ACL for RCPT is running, the other headers
881have not yet been received. This function is called twice; once just before
882running the DATA ACL, and once after. This is so that header lines added by
883MAIL or RCPT are visible to the DATA ACL.
884
885Originally these header lines were added at the end. Now there is support for
886three different places: top, bottom, and after the Received: header(s). There
887will always be at least one Received: header, even if it is marked deleted, and
888even if something else has been put in front of it.
889
890Arguments:
891 acl_name text to identify which ACL
892
893Returns: nothing
894*/
895
896static void
897add_acl_headers(uschar *acl_name)
898{
899header_line *h, *next;
900header_line *last_received = NULL;
901
902if (acl_warn_headers == NULL) return;
903DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
904
905for (h = acl_warn_headers; h != NULL; h = next)
906 {
907 next = h->next;
908
909 switch(h->type)
910 {
911 case htype_add_top:
912 h->next = header_list;
913 header_list = h;
914 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
915 break;
916
917 case htype_add_rec:
918 if (last_received == NULL)
919 {
920 last_received = header_list;
921 while (!header_testname(last_received, US"Received", 8, FALSE))
922 last_received = last_received->next;
923 while (last_received->next != NULL &&
924 header_testname(last_received->next, US"Received", 8, FALSE))
925 last_received = last_received->next;
926 }
927 h->next = last_received->next;
928 last_received->next = h;
929 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
930 break;
931
8523533c
TK
932 case htype_add_rfc:
933 /* add header before any header which is NOT Received: or Resent- */
934 last_received = header_list;
935 while ( (last_received->next != NULL) &&
936 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
937 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
938 last_received = last_received->next;
939 /* last_received now points to the last Received: or Resent-* header
940 in an uninterrupted chain of those header types (seen from the beginning
941 of all headers. Our current header must follow it. */
942 h->next = last_received->next;
943 last_received->next = h;
8e669ac1 944 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
8523533c
TK
945 break;
946
059ec3d9
PH
947 default:
948 h->next = NULL;
949 header_last->next = h;
950 break;
951 }
952
953 if (h->next == NULL) header_last = h;
954
955 /* Check for one of the known header types (From:, To:, etc.) though in
956 practice most added headers are going to be "other". Lower case
957 identification letters are never stored with the header; they are used
958 for existence tests when messages are received. So discard any lower case
959 flag values. */
960
961 h->type = header_checkname(h, FALSE);
962 if (h->type >= 'a') h->type = htype_other;
963
964 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
965 }
966
967acl_warn_headers = NULL;
968DEBUG(D_receive|D_acl) debug_printf(">>\n");
969}
970
971
972
973/*************************************************
974* Add host information for log line *
975*************************************************/
976
977/* Called for acceptance and rejecting log lines. This adds information about
978the calling host to a string that is being built dynamically.
979
980Arguments:
981 s the dynamic string
982 sizeptr points to the size variable
983 ptrptr points to the pointer variable
984
985Returns: the extended string
986*/
987
988static uschar *
989add_host_info_for_log(uschar *s, int *sizeptr, int *ptrptr)
990{
991if (sender_fullhost != NULL)
992 {
993 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
994 if ((log_extra_selector & LX_incoming_interface) != 0 &&
995 interface_address != NULL)
996 {
997 uschar *ss = string_sprintf(" I=[%s]:%d", interface_address,
998 interface_port);
999 s = string_cat(s, sizeptr, ptrptr, ss, Ustrlen(ss));
1000 }
1001 }
1002if (sender_ident != NULL)
1003 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1004if (received_protocol != NULL)
1005 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1006return s;
1007}
1008
1009
1010
63955bf2 1011#ifdef WITH_CONTENT_SCAN
059ec3d9
PH
1012
1013/*************************************************
54cdb463
PH
1014* Run the MIME ACL on a message *
1015*************************************************/
1016
1017/* This code is in a subroutine so that it can be used for both SMTP
1018and non-SMTP messages. It is called with a non-NULL ACL pointer.
1019
1020Arguments:
1021 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1022 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1023 smtp_reply_ptr Where SMTP reply is being built
1024 blackholed_by_ptr Where "blackholed by" message is being built
1025
1026Returns: TRUE to carry on; FALSE to abandon the message
1027*/
1028
1029static BOOL
1030run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1031 uschar **blackholed_by_ptr)
1032{
1033FILE *mbox_file;
1034uschar rfc822_file_path[2048];
1035unsigned long mbox_size;
1036header_line *my_headerlist;
1037uschar *user_msg, *log_msg;
1038int mime_part_count_buffer = -1;
1039int rc;
1040
1041memset(CS rfc822_file_path,0,2048);
1042
1043/* check if it is a MIME message */
1044my_headerlist = header_list;
1045while (my_headerlist != NULL) {
1046 /* skip deleted headers */
1047 if (my_headerlist->type == '*') {
1048 my_headerlist = my_headerlist->next;
1049 continue;
1050 };
1051 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0) {
1052 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1053 goto DO_MIME_ACL;
1054 };
1055 my_headerlist = my_headerlist->next;
1056};
1057
1058DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1059return TRUE;
1060
1061DO_MIME_ACL:
1062/* make sure the eml mbox file is spooled up */
1063mbox_file = spool_mbox(&mbox_size);
1064if (mbox_file == NULL) {
1065 /* error while spooling */
1066 log_write(0, LOG_MAIN|LOG_PANIC,
1067 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1068 Uunlink(spool_name);
1069 unspool_mbox();
1070 smtp_respond(451, TRUE, US"temporary local problem");
1071 message_id[0] = 0; /* Indicate no message accepted */
1072 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1073 return FALSE; /* Indicate skip to end of receive function */
1074};
1075
1076mime_is_rfc822 = 0;
1077
1078MIME_ACL_CHECK:
1079mime_part_count = -1;
1080rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
f1e894f3 1081(void)fclose(mbox_file);
54cdb463
PH
1082
1083if (Ustrlen(rfc822_file_path) > 0) {
1084 mime_part_count = mime_part_count_buffer;
1085
1086 if (unlink(CS rfc822_file_path) == -1) {
1087 log_write(0, LOG_PANIC,
1088 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1089 goto END_MIME_ACL;
1090 };
1091};
1092
1093/* check if we must check any message/rfc822 attachments */
1094if (rc == OK) {
1095 uschar temp_path[1024];
1096 int n;
1097 struct dirent *entry;
1098 DIR *tempdir;
1099
b07e6aa3
PH
1100 (void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
1101 message_id);
54cdb463
PH
1102
1103 tempdir = opendir(CS temp_path);
1104 n = 0;
1105 do {
1106 entry = readdir(tempdir);
1107 if (entry == NULL) break;
1108 if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0) {
b07e6aa3 1109 (void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
54cdb463
PH
1110 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
1111 break;
1112 };
1113 } while (1);
1114 closedir(tempdir);
1115
1116 if (entry != NULL) {
c58b88df 1117 mbox_file = Ufopen(rfc822_file_path,"rb");
54cdb463
PH
1118 if (mbox_file == NULL) {
1119 log_write(0, LOG_PANIC,
1120 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1121 unlink(CS rfc822_file_path);
1122 goto END_MIME_ACL;
1123 };
1124 /* set RFC822 expansion variable */
1125 mime_is_rfc822 = 1;
1126 mime_part_count_buffer = mime_part_count;
1127 goto MIME_ACL_CHECK;
1128 };
1129};
1130
1131END_MIME_ACL:
1132add_acl_headers(US"MIME");
1133if (rc == DISCARD)
1134 {
1135 recipients_count = 0;
1136 *blackholed_by_ptr = US"MIME ACL";
1137 }
1138else if (rc != OK)
1139 {
1140 Uunlink(spool_name);
1141 unspool_mbox();
1142 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1143 *smtp_yield_ptr = FALSE; /* No more messsages after dropped connection */
1144 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1145 message_id[0] = 0; /* Indicate no message accepted */
1146 return FALSE; /* Cause skip to end of receive function */
1147 };
1148
1149return TRUE;
1150}
1151
63955bf2 1152#endif /* WITH_CONTENT_SCAN */
54cdb463
PH
1153
1154
1155/*************************************************
059ec3d9
PH
1156* Receive message *
1157*************************************************/
1158
1159/* Receive a message on the given input, and put it into a pair of spool files.
1160Either a non-null list of recipients, or the extract flag will be true, or
1161both. The flag sender_local is true for locally generated messages. The flag
1162submission_mode is true if an ACL has obeyed "control = submission". The flag
1163smtp_input is true if the message is to be handled using SMTP conventions about
1164termination and lines starting with dots. For non-SMTP messages, dot_ends is
1165true for dot-terminated messages.
1166
1167If a message was successfully read, message_id[0] will be non-zero.
1168
1169The general actions of this function are:
1170
1171 . Read the headers of the message (if any) into a chain of store
1172 blocks.
1173
1174 . If there is a "sender:" header and the message is locally originated,
69358f02
PH
1175 throw it away, unless the caller is trusted, or unless
1176 active_local_sender_retain is set - which can only happen if
1177 active_local_from_check is false.
059ec3d9
PH
1178
1179 . If recipients are to be extracted from the message, build the
1180 recipients list from the headers, removing any that were on the
1181 original recipients list (unless extract_addresses_remove_arguments is
1182 false), and at the same time, remove any bcc header that may be present.
1183
1184 . Get the spool file for the data, sort out its unique name, open
1185 and lock it (but don't give it the name yet).
1186
1187 . Generate a "Message-Id" header if the message doesn't have one, for
1188 locally-originated messages.
1189
1190 . Generate a "Received" header.
1191
1192 . Ensure the recipients list is fully qualified and rewritten if necessary.
1193
1194 . If there are any rewriting rules, apply them to the sender address
1195 and also to the headers.
1196
1197 . If there is no from: header, generate one, for locally-generated messages
1198 and messages in "submission mode" only.
1199
1200 . If the sender is local, check that from: is correct, and if not, generate
1201 a Sender: header, unless message comes from a trusted caller, or this
69358f02 1202 feature is disabled by active_local_from_check being false.
059ec3d9
PH
1203
1204 . If there is no "date" header, generate one, for locally-originated
1205 or submission mode messages only.
1206
1207 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1208 dot_ends mode, to the data file. Leave it open, to hold the lock.
1209
1210 . Write the envelope and the headers to a new file.
1211
1212 . Set the name for the header file; close it.
1213
1214 . Set the name for the data file; close it.
1215
1216Because this function can potentially be called many times in a single
1217SMTP connection, all store should be got by store_get(), so that it will be
1218automatically retrieved after the message is accepted.
1219
1220FUDGE: It seems that sites on the net send out messages with just LF
1221terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1222we make the CRs optional in all cases.
1223
1224July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1225new regime is now in place in which bare CRs in header lines are turned into LF
1226followed by a space, so as not to terminate the header line.
1227
1228February 2004: A bare LF in a header line in a message whose first line was
1229terminated by CRLF is treated in the same way as a bare CR.
1230
1231Arguments:
1232 extract_recip TRUE if recipients are to be extracted from the message's
1233 headers
1234
1235Returns: TRUE there are more messages to be read (SMTP input)
1236 FALSE there are no more messages to be read (non-SMTP input
1237 or SMTP connection collapsed, or other failure)
1238
1239When reading a message for filter testing, the returned value indicates
1240whether the headers (which is all that is read) were terminated by '.' or
1241not. */
1242
1243BOOL
1244receive_msg(BOOL extract_recip)
1245{
1246int i, rc;
1247int msg_size = 0;
1248int process_info_len = Ustrlen(process_info);
1249int error_rc = (error_handling == ERRORS_SENDER)?
1250 errors_sender_rc : EXIT_FAILURE;
1251int header_size = 256;
1252int start, end, domain, size, sptr;
1253int id_resolution;
1254int had_zero = 0;
1255
1256register int ptr = 0;
1257
1258BOOL contains_resent_headers = FALSE;
1259BOOL extracted_ignored = FALSE;
1260BOOL first_line_ended_crlf = TRUE_UNSET;
1261BOOL smtp_yield = TRUE;
1262BOOL yield = FALSE;
1263
1264BOOL resents_exist = FALSE;
1265uschar *resent_prefix = US"";
1266uschar *blackholed_by = NULL;
04f7d5b9 1267uschar *blackhole_log_msg = US"";
059ec3d9
PH
1268
1269flock_t lock_data;
1270error_block *bad_addresses = NULL;
1271
1272uschar *frozen_by = NULL;
1273uschar *queued_by = NULL;
1274
1275uschar *errmsg, *s;
1276struct stat statbuf;
1277
1278/* Final message to give to SMTP caller */
1279
1280uschar *smtp_reply = NULL;
1281
1282/* Working header pointers */
1283
1284header_line *h, *next;
1285
1286/* Flags for noting the existence of certain headers */
1287
1288/**** No longer check for these (Nov 2003)
1289BOOL to_or_cc_header_exists = FALSE;
1290BOOL bcc_header_exists = FALSE;
1291****/
1292
1293BOOL date_header_exists = FALSE;
1294
1295/* Pointers to receive the addresses of headers whose contents we need. */
1296
1297header_line *from_header = NULL;
1298header_line *subject_header = NULL;
1299header_line *msgid_header = NULL;
1300header_line *received_header;
1301
1302/* Variables for use when building the Received: header. */
1303
1304uschar *received;
1305uschar *timestamp;
1306int tslen;
1307
1308/* Release any open files that might have been cached while preparing to
1309accept the message - e.g. by verifying addresses - because reading a message
1310might take a fair bit of real time. */
1311
1312search_tidyup();
1313
1314/* Initialize the chain of headers by setting up a place-holder for Received:
1315header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1316pointing to the end of the chain to make adding headers simple. */
1317
1318received_header = header_list = header_last = store_get(sizeof(header_line));
1319header_list->next = NULL;
1320header_list->type = htype_old;
1321header_list->text = NULL;
1322header_list->slen = 0;
1323
1324/* Control block for the next header to be read. */
1325
1326next = store_get(sizeof(header_line));
1327next->text = store_get(header_size);
1328
1329/* Initialize message id to be null (indicating no message read), and the
1330header names list to be the normal list. Indicate there is no data file open
1331yet, initialize the size and warning count, and deal with no size limit. */
1332
1333message_id[0] = 0;
1334data_file = NULL;
1335data_fd = -1;
1336spool_name[0] = 0;
1337message_size = 0;
1338warning_count = 0;
1339received_count = 1; /* For the one we will add */
1340
1341if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1342
2e0c1448 1343/* While reading the message, the following counts are computed. */
059ec3d9 1344
2e0c1448 1345message_linecount = body_linecount = body_zerocount = 0;
059ec3d9 1346
fb2274d4
TK
1347#ifdef EXPERIMENTAL_DOMAINKEYS
1348/* Call into DK to set up the context. Check if DK is to be run are carried out
1349 inside dk_exim_verify_init(). */
1350dk_exim_verify_init();
1351#endif
1352
059ec3d9
PH
1353/* Remember the time of reception. Exim uses time+pid for uniqueness of message
1354ids, and fractions of a second are required. See the comments that precede the
1355message id creation below. */
1356
1357(void)gettimeofday(&message_id_tv, NULL);
1358
1359/* For other uses of the received time we can operate with granularity of one
1360second, and for that we use the global variable received_time. This is for
1361things like ultimate message timeouts. */
1362
1363received_time = message_id_tv.tv_sec;
1364
1365/* If SMTP input, set the special handler for timeouts. The alarm() calls
1366happen in the smtp_getc() function when it refills its buffer. */
1367
1368if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1369
1370/* If not SMTP input, timeout happens only if configured, and we just set a
1371single timeout for the whole message. */
1372
1373else if (receive_timeout > 0)
1374 {
1375 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1376 alarm(receive_timeout);
1377 }
1378
1379/* SIGTERM and SIGINT are caught always. */
1380
1381signal(SIGTERM, data_sigterm_sigint_handler);
1382signal(SIGINT, data_sigterm_sigint_handler);
1383
1384/* Header lines in messages are not supposed to be very long, though when
1385unfolded, to: and cc: headers can take up a lot of store. We must also cope
1386with the possibility of junk being thrown at us. Start by getting 256 bytes for
1387storing the header, and extend this as necessary using string_cat().
1388
1389To cope with total lunacies, impose an upper limit on the length of the header
1390section of the message, as otherwise the store will fill up. We must also cope
1391with the possibility of binary zeros in the data. Hence we cannot use fgets().
1392Folded header lines are joined into one string, leaving the '\n' characters
1393inside them, so that writing them out reproduces the input.
1394
1395Loop for each character of each header; the next structure for chaining the
1396header is set up already, with ptr the offset of the next character in
1397next->text. */
1398
1399for (;;)
1400 {
fb2274d4 1401 int ch = (RECEIVE_GETC)();
059ec3d9
PH
1402
1403 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1404 SMTP must have a correct "." terminator. */
1405
1406 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1407 {
1408 smtp_reply = handle_lost_connection(US" (header)");
1409 smtp_yield = FALSE;
1410 goto TIDYUP; /* Skip to end of function */
1411 }
1412
1413 /* See if we are at the current header's size limit - there must be at least
1414 four bytes left. This allows for the new character plus a zero, plus two for
1415 extra insertions when we are playing games with dots and carriage returns. If
1416 we are at the limit, extend the text buffer. This could have been done
1417 automatically using string_cat() but because this is a tightish loop storing
1418 only one character at a time, we choose to do it inline. Normally
1419 store_extend() will be able to extend the block; only at the end of a big
1420 store block will a copy be needed. To handle the case of very long headers
1421 (and sometimes lunatic messages can have ones that are 100s of K long) we
1422 call store_release() for strings that have been copied - if the string is at
1423 the start of a block (and therefore the only thing in it, because we aren't
1424 doing any other gets), the block gets freed. We can only do this because we
1425 know there are no other calls to store_get() going on. */
1426
1427 if (ptr >= header_size - 4)
1428 {
1429 int oldsize = header_size;
1430 /* header_size += 256; */
1431 header_size *= 2;
1432 if (!store_extend(next->text, oldsize, header_size))
1433 {
1434 uschar *newtext = store_get(header_size);
1435 memcpy(newtext, next->text, ptr);
1436 store_release(next->text);
1437 next->text = newtext;
1438 }
1439 }
1440
1441 /* Cope with receiving a binary zero. There is dispute about whether
1442 these should be allowed in RFC 822 messages. The middle view is that they
1443 should not be allowed in headers, at least. Exim takes this attitude at
1444 the moment. We can't just stomp on them here, because we don't know that
1445 this line is a header yet. Set a flag to cause scanning later. */
1446
1447 if (ch == 0) had_zero++;
1448
1449 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1450 those from data files use just LF. Treat LF in local SMTP input as a
1451 terminator too. Treat EOF as a line terminator always. */
1452
1453 if (ch == EOF) goto EOL;
1454
1455 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1456 other MTAs accept this. We are therefore forced into this "liberalisation"
1457 too, so we accept LF as a line terminator whatever the source of the message.
1458 However, if the first line of the message ended with a CRLF, we treat a bare
1459 LF specially by inserting a white space after it to ensure that the header
1460 line is not terminated. */
1461
1462 if (ch == '\n')
1463 {
1464 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
fb2274d4 1465 else if (first_line_ended_crlf) RECEIVE_UNGETC(' ');
059ec3d9
PH
1466 goto EOL;
1467 }
1468
1469 /* This is not the end of the line. If this is SMTP input and this is
1470 the first character in the line and it is a "." character, ignore it.
1471 This implements the dot-doubling rule, though header lines starting with
1472 dots aren't exactly common. They are legal in RFC 822, though. If the
1473 following is CRLF or LF, this is the line that that terminates the
1474 entire message. We set message_ended to indicate this has happened (to
1475 prevent further reading), and break out of the loop, having freed the
1476 empty header, and set next = NULL to indicate no data line. */
1477
1478 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1479 {
fb2274d4 1480 ch = (RECEIVE_GETC)();
059ec3d9
PH
1481 if (ch == '\r')
1482 {
fb2274d4 1483 ch = (RECEIVE_GETC)();
059ec3d9
PH
1484 if (ch != '\n')
1485 {
fb2274d4 1486 RECEIVE_UNGETC(ch);
059ec3d9
PH
1487 ch = '\r'; /* Revert to CR */
1488 }
1489 }
1490 if (ch == '\n')
1491 {
1492 message_ended = END_DOT;
1493 store_reset(next);
1494 next = NULL;
1495 break; /* End character-reading loop */
1496 }
1497
1498 /* For non-SMTP input, the dot at the start of the line was really a data
1499 character. What is now in ch is the following character. We guaranteed
1500 enough space for this above. */
1501
1502 if (!smtp_input)
1503 {
1504 next->text[ptr++] = '.';
1505 message_size++;
1506 }
1507 }
1508
1509 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1510 remember this case if this is the first line ending. */
1511
1512 if (ch == '\r')
1513 {
fb2274d4 1514 ch = (RECEIVE_GETC)();
059ec3d9
PH
1515 if (ch == '\n')
1516 {
1517 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1518 goto EOL;
1519 }
1520
1521 /* Otherwise, put back the character after CR, and turn the bare CR
1522 into LF SP. */
1523
fb2274d4 1524 ch = (RECEIVE_UNGETC)(ch);
059ec3d9
PH
1525 next->text[ptr++] = '\n';
1526 message_size++;
1527 ch = ' ';
1528 }
1529
1530 /* We have a data character for the header line. */
1531
1532 next->text[ptr++] = ch; /* Add to buffer */
1533 message_size++; /* Total message size so far */
1534
1535 /* Handle failure due to a humungously long header section. The >= allows
1536 for the terminating \n. Add what we have so far onto the headers list so
1537 that it gets reflected in any error message, and back up the just-read
1538 character. */
1539
1540 if (message_size >= header_maxsize)
1541 {
1542 next->text[ptr] = 0;
1543 next->slen = ptr;
1544 next->type = htype_other;
1545 next->next = NULL;
1546 header_last->next = next;
1547 header_last = next;
1548
1549 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1550 "%s (more than %d characters): message abandoned",
1551 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1552
1553 if (smtp_input)
1554 {
1555 smtp_reply = US"552 Message header is ridiculously long";
1556 receive_swallow_smtp();
1557 goto TIDYUP; /* Skip to end of function */
1558 }
1559
1560 else
1561 {
1562 give_local_error(ERRMESS_VLONGHEADER,
1563 string_sprintf("message header longer than %d characters received: "
1564 "message not accepted", header_maxsize), US"", error_rc, stdin,
1565 header_list->next);
1566 /* Does not return */
1567 }
1568 }
1569
1570 continue; /* With next input character */
1571
1572 /* End of header line reached */
1573
1574 EOL:
2e0c1448
PH
1575
1576 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1577
1578 receive_linecount++;
1579 message_linecount++;
059ec3d9
PH
1580
1581 /* Now put in the terminating newline. There is always space for
1582 at least two more characters. */
1583
1584 next->text[ptr++] = '\n';
1585 message_size++;
1586
1587 /* A blank line signals the end of the headers; release the unwanted
1588 space and set next to NULL to indicate this. */
1589
1590 if (ptr == 1)
1591 {
1592 store_reset(next);
1593 next = NULL;
1594 break;
1595 }
1596
1597 /* There is data in the line; see if the next input character is a
1598 whitespace character. If it is, we have a continuation of this header line.
1599 There is always space for at least one character at this point. */
1600
1601 if (ch != EOF)
1602 {
fb2274d4 1603 int nextch = (RECEIVE_GETC)();
059ec3d9
PH
1604 if (nextch == ' ' || nextch == '\t')
1605 {
1606 next->text[ptr++] = nextch;
1607 message_size++;
1608 continue; /* Iterate the loop */
1609 }
fb2274d4 1610 else if (nextch != EOF) (RECEIVE_UNGETC)(nextch); /* For next time */
059ec3d9
PH
1611 else ch = EOF; /* Cause main loop to exit at end */
1612 }
1613
1614 /* We have got to the real line end. Terminate the string and release store
1615 beyond it. If it turns out to be a real header, internal binary zeros will
1616 be squashed later. */
1617
1618 next->text[ptr] = 0;
1619 next->slen = ptr;
1620 store_reset(next->text + ptr + 1);
1621
1622 /* Check the running total size against the overall message size limit. We
1623 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1624 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1625 headers - the code to read the body will then also hit the buffer. */
1626
1627 if (message_size > thismessage_size_limit) break;
1628
1629 /* A line that is not syntactically correct for a header also marks
1630 the end of the headers. In this case, we leave next containing the
1631 first data line. This might actually be several lines because of the
1632 continuation logic applied above, but that doesn't matter.
1633
1634 It turns out that smail, and presumably sendmail, accept leading lines
1635 of the form
1636
1637 From ph10 Fri Jan 5 12:35 GMT 1996
1638
1639 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1640 find any documentation of this, but for compatibility it had better be
1641 accepted. Exim restricts it to the case of non-smtp messages, and
1642 treats it as an alternative to the -f command line option. Thus it is
1643 ignored except for trusted users or filter testing. Otherwise it is taken
1644 as the sender address, unless -f was used (sendmail compatibility).
1645
1646 It further turns out that some UUCPs generate the From_line in a different
1647 format, e.g.
1648
1649 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1650
1651 The regex for matching these things is now capable of recognizing both
1652 formats (including 2- and 4-digit years in the latter). In fact, the regex
1653 is now configurable, as is the expansion string to fish out the sender.
1654
1655 Even further on it has been discovered that some broken clients send
1656 these lines in SMTP messages. There is now an option to ignore them from
1657 specified hosts or networks. Sigh. */
1658
1659 if (header_last == header_list &&
1660 (!smtp_input
1661 ||
1662 (sender_host_address != NULL &&
1663 verify_check_host(&ignore_fromline_hosts) == OK)
1664 ||
1665 (sender_host_address == NULL && ignore_fromline_local)
1666 ) &&
1667 regex_match_and_setup(regex_From, next->text, 0, -1))
1668 {
1669 if (!sender_address_forced)
1670 {
1671 uschar *uucp_sender = expand_string(uucp_from_sender);
1672 if (uucp_sender == NULL)
1673 {
1674 log_write(0, LOG_MAIN|LOG_PANIC,
1675 "expansion of \"%s\" failed after matching "
1676 "\"From \" line: %s", uucp_from_sender, expand_string_message);
1677 }
1678 else
1679 {
1680 int start, end, domain;
1681 uschar *errmess;
1682 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
1683 &start, &end, &domain, TRUE);
1684 if (newsender != NULL)
1685 {
1686 if (domain == 0 && newsender[0] != 0)
1687 newsender = rewrite_address_qualify(newsender, FALSE);
1688
f05da2e8 1689 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
059ec3d9
PH
1690 {
1691 sender_address = newsender;
1692
f05da2e8 1693 if (trusted_caller || filter_test != FTEST_NONE)
059ec3d9
PH
1694 {
1695 authenticated_sender = NULL;
1696 originator_name = US"";
1697 sender_local = FALSE;
1698 }
1699
f05da2e8 1700 if (filter_test != FTEST_NONE)
059ec3d9
PH
1701 printf("Sender taken from \"From \" line\n");
1702 }
1703 }
1704 }
1705 }
1706 }
1707
1708 /* Not a leading "From " line. Check to see if it is a valid header line.
1709 Header names may contain any non-control characters except space and colon,
1710 amazingly. */
1711
1712 else
1713 {
1714 uschar *p = next->text;
1715
1716 /* If not a valid header line, break from the header reading loop, leaving
1717 next != NULL, indicating that it holds the first line of the body. */
1718
1719 if (isspace(*p)) break;
1720 while (mac_isgraph(*p) && *p != ':') p++;
1721 while (isspace(*p)) p++;
1722 if (*p != ':')
1723 {
1724 body_zerocount = had_zero;
1725 break;
1726 }
1727
1728 /* We have a valid header line. If there were any binary zeroes in
1729 the line, stomp on them here. */
1730
1731 if (had_zero > 0)
1732 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
1733
1734 /* It is perfectly legal to have an empty continuation line
1735 at the end of a header, but it is confusing to humans
1736 looking at such messages, since it looks like a blank line.
1737 Reduce confusion by removing redundant white space at the
1738 end. We know that there is at least one printing character
1739 (the ':' tested for above) so there is no danger of running
1740 off the end. */
1741
1742 p = next->text + ptr - 2;
1743 for (;;)
1744 {
1745 while (*p == ' ' || *p == '\t') p--;
1746 if (*p != '\n') break;
1747 ptr = (p--) - next->text + 1;
1748 message_size -= next->slen - ptr;
1749 next->text[ptr] = 0;
1750 next->slen = ptr;
1751 }
1752
1753 /* Add the header to the chain */
1754
1755 next->type = htype_other;
1756 next->next = NULL;
1757 header_last->next = next;
1758 header_last = next;
1759
1760 /* Check the limit for individual line lengths. This comes after adding to
1761 the chain so that the failing line is reflected if a bounce is generated
1762 (for a local message). */
1763
1764 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
1765 {
1766 log_write(0, LOG_MAIN, "overlong message header line received from "
1767 "%s (more than %d characters): message abandoned",
1768 sender_host_unknown? sender_ident : sender_fullhost,
1769 header_line_maxsize);
1770
1771 if (smtp_input)
1772 {
1773 smtp_reply = US"552 A message header line is too long";
1774 receive_swallow_smtp();
1775 goto TIDYUP; /* Skip to end of function */
1776 }
1777
1778 else
1779 {
1780 give_local_error(ERRMESS_VLONGHDRLINE,
1781 string_sprintf("message header line longer than %d characters "
1782 "received: message not accepted", header_line_maxsize), US"",
1783 error_rc, stdin, header_list->next);
1784 /* Does not return */
1785 }
1786 }
1787
1788 /* Note if any resent- fields exist. */
1789
1790 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
1791 {
1792 resents_exist = TRUE;
1793 resent_prefix = US"Resent-";
1794 }
1795 }
1796
1797 /* The line has been handled. If we have hit EOF, break out of the loop,
1798 indicating no pending data line. */
1799
1800 if (ch == EOF) { next = NULL; break; }
1801
1802 /* Set up for the next header */
1803
1804 header_size = 256;
1805 next = store_get(sizeof(header_line));
1806 next->text = store_get(header_size);
1807 ptr = 0;
1808 had_zero = 0;
1809 } /* Continue, starting to read the next header */
1810
1811/* At this point, we have read all the headers into a data structure in main
1812store. The first header is still the dummy placeholder for the Received: header
1813we are going to generate a bit later on. If next != NULL, it contains the first
1814data line - which terminated the headers before reaching a blank line (not the
1815normal case). */
1816
1817DEBUG(D_receive)
1818 {
1819 debug_printf(">>Headers received:\n");
1820 for (h = header_list->next; h != NULL; h = h->next)
1821 debug_printf("%s", h->text);
1822 debug_printf("\n");
1823 }
1824
1825/* End of file on any SMTP connection is an error. If an incoming SMTP call
1826is dropped immediately after valid headers, the next thing we will see is EOF.
1827We must test for this specially, as further down the reading of the data is
1828skipped if already at EOF. */
1829
1830if (smtp_input && (receive_feof)())
1831 {
1832 smtp_reply = handle_lost_connection(US" (after header)");
1833 smtp_yield = FALSE;
1834 goto TIDYUP; /* Skip to end of function */
1835 }
1836
1837/* If this is a filter test run and no headers were read, output a warning
1838in case there is a mistake in the test message. */
1839
f05da2e8 1840if (filter_test != FTEST_NONE && header_list->next == NULL)
059ec3d9
PH
1841 printf("Warning: no message headers read\n");
1842
1843
1844/* Scan the headers to identify them. Some are merely marked for later
1845processing; some are dealt with here. */
1846
1847for (h = header_list->next; h != NULL; h = h->next)
1848 {
1849 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
1850 if (is_resent) contains_resent_headers = TRUE;
1851
1852 switch (header_checkname(h, is_resent))
1853 {
1854 /* "Bcc:" gets flagged, and its existence noted, whether it's resent- or
1855 not. */
1856
1857 case htype_bcc:
1858 h->type = htype_bcc;
1859 /****
1860 bcc_header_exists = TRUE;
1861 ****/
1862 break;
1863
1864 /* "Cc:" gets flagged, and the existence of a recipient header is noted,
1865 whether it's resent- or not. */
1866
1867 case htype_cc:
1868 h->type = htype_cc;
1869 /****
1870 to_or_cc_header_exists = TRUE;
1871 ****/
1872 break;
1873
1874 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1875
1876 case htype_date:
1877 date_header_exists = !resents_exist || is_resent;
1878 break;
1879
1880 /* Same comments as about Return-Path: below. */
1881
1882 case htype_delivery_date:
1883 if (delivery_date_remove) h->type = htype_old;
1884 break;
1885
1886 /* Same comments as about Return-Path: below. */
1887
1888 case htype_envelope_to:
1889 if (envelope_to_remove) h->type = htype_old;
1890 break;
1891
1892 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1893 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1894 header consists of just the login id of the user who called Exim, rewrite
1895 it with the gecos field first. Apply this rule to Resent-From: if there
1896 are resent- fields. */
1897
1898 case htype_from:
1899 h->type = htype_from;
1900 if (!resents_exist || is_resent)
1901 {
1902 from_header = h;
1903 if (!smtp_input)
1904 {
1905 uschar *s = Ustrchr(h->text, ':') + 1;
1906 while (isspace(*s)) s++;
1907 if (strncmpic(s, originator_login, h->slen - (s - h->text) - 1) == 0)
1908 {
1909 uschar *name = is_resent? US"Resent-From" : US"From";
1910 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
1911 originator_login, qualify_domain_sender);
1912 from_header = header_last;
1913 h->type = htype_old;
1914 DEBUG(D_receive|D_rewrite)
1915 debug_printf("rewrote \"%s:\" header using gecos\n", name);
1916 }
1917 }
1918 }
1919 break;
1920
1921 /* Identify the Message-id: header for generating "in-reply-to" in the
1922 autoreply transport. For incoming logging, save any resent- value. In both
1923 cases, take just the first of any multiples. */
1924
1925 case htype_id:
1926 if (msgid_header == NULL && (!resents_exist || is_resent))
1927 {
1928 msgid_header = h;
1929 h->type = htype_id;
1930 }
1931 break;
1932
1933 /* Flag all Received: headers */
1934
1935 case htype_received:
1936 h->type = htype_received;
1937 received_count++;
1938 break;
1939
1940 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1941
1942 case htype_reply_to:
1943 h->type = htype_reply_to;
1944 break;
1945
1946 /* The Return-path: header is supposed to be added to messages when
1947 they leave the SMTP system. We shouldn't receive messages that already
1948 contain Return-path. However, since Exim generates Return-path: on
1949 local delivery, resent messages may well contain it. We therefore
1950 provide an option (which defaults on) to remove any Return-path: headers
1951 on input. Removal actually means flagging as "old", which prevents the
1952 header being transmitted with the message. */
1953
1954 case htype_return_path:
1955 if (return_path_remove) h->type = htype_old;
1956
1957 /* If we are testing a mail filter file, use the value of the
1958 Return-Path: header to set up the return_path variable, which is not
1959 otherwise set. However, remove any <> that surround the address
1960 because the variable doesn't have these. */
1961
f05da2e8 1962 if (filter_test != FTEST_NONE)
059ec3d9
PH
1963 {
1964 uschar *start = h->text + 12;
1965 uschar *end = start + Ustrlen(start);
1966 while (isspace(*start)) start++;
1967 while (end > start && isspace(end[-1])) end--;
1968 if (*start == '<' && end[-1] == '>')
1969 {
1970 start++;
1971 end--;
1972 }
1973 return_path = string_copyn(start, end - start);
1974 printf("Return-path taken from \"Return-path:\" header line\n");
1975 }
1976 break;
1977
1978 /* If there is a "Sender:" header and the message is locally originated,
1979 and from an untrusted caller, or if we are in submission mode for a remote
1980 message, mark it "old" so that it will not be transmitted with the message,
69358f02
PH
1981 unless active_local_sender_retain is set. (This can only be true if
1982 active_local_from_check is false.) If there are any resent- headers in the
059ec3d9
PH
1983 message, apply this rule to Resent-Sender: instead of Sender:. Messages
1984 with multiple resent- header sets cannot be tidily handled. (For this
1985 reason, at least one MUA - Pine - turns old resent- headers into X-resent-
1986 headers when resending, leaving just one set.) */
1987
1988 case htype_sender:
69358f02
PH
1989 h->type = ((!active_local_sender_retain &&
1990 ((sender_local && !trusted_caller) || submission_mode)
059ec3d9
PH
1991 ) &&
1992 (!resents_exist||is_resent))?
1993 htype_old : htype_sender;
1994 break;
1995
1996 /* Remember the Subject: header for logging. There is no Resent-Subject */
1997
1998 case htype_subject:
1999 subject_header = h;
2000 break;
2001
2002 /* "To:" gets flagged, and the existence of a recipient header is noted,
2003 whether it's resent- or not. */
2004
2005 case htype_to:
2006 h->type = htype_to;
2007 /****
2008 to_or_cc_header_exists = TRUE;
2009 ****/
2010 break;
2011 }
2012 }
2013
2014/* Extract recipients from the headers if that is required (the -t option).
2015Note that this is documented as being done *before* any address rewriting takes
2016place. There are two possibilities:
2017
2018(1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2019recipients already listed are to be REMOVED from the message. Smail 3 works
2020like this. We need to build a non-recipients tree for that list, because in
2021subsequent processing this data is held in a tree and that's what the
2022spool_write_header() function expects. Make sure that non-recipient addresses
2023are fully qualified and rewritten if necessary.
2024
2025(2) According to other sendmail documentation, -t ADDS extracted recipients to
2026those in the command line arguments (and it is rumoured some other MTAs do
2027this). Therefore, there is an option to make Exim behave this way.
2028
2029*** Notes on "Resent-" header lines ***
2030
2031The presence of resent-headers in the message makes -t horribly ambiguous.
2032Experiments with sendmail showed that it uses recipients for all resent-
2033headers, totally ignoring the concept of "sets of resent- headers" as described
2034in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2035with all the addresses in one instance of each header.
2036
2037This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2038error for -t if there were resent- headers in the message. However, after a
2039discussion on the mailing list, I've learned that there are MUAs that use
2040resent- headers with -t, and also that the stuff about sets of resent- headers
2041and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2042message with -t and resent- header lines makes sure that only *its* resent-
2043headers are present; previous ones are often renamed as X-resent- for example.
2044
2045Consequently, Exim has been changed so that, if any resent- header lines are
2046present, the recipients are taken from all of the appropriate resent- lines,
2047and not from the ordinary To:, Cc:, etc. */
2048
2049if (extract_recip)
2050 {
2051 int rcount = 0;
2052 error_block **bnext = &bad_addresses;
2053
2054 if (extract_addresses_remove_arguments)
2055 {
2056 while (recipients_count-- > 0)
2057 {
2058 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2059 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2060 tree_add_nonrecipient(s);
2061 }
2062 recipients_list = NULL;
2063 recipients_count = recipients_list_max = 0;
2064 }
2065
2066 parse_allow_group = TRUE; /* Allow address group syntax */
2067
2068 /* Now scan the headers */
2069
2070 for (h = header_list->next; h != NULL; h = h->next)
2071 {
2072 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2073 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2074 {
2075 uschar *s = Ustrchr(h->text, ':') + 1;
2076 while (isspace(*s)) s++;
2077
2078 while (*s != 0)
2079 {
2080 uschar *ss = parse_find_address_end(s, FALSE);
2081 uschar *recipient, *errmess, *p, *pp;
2082 int start, end, domain;
2083
2084 /* Check on maximum */
2085
2086 if (recipients_max > 0 && ++rcount > recipients_max)
2087 {
2088 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2089 US"message rejected: ", error_rc, stdin, NULL);
2090 /* Does not return */
2091 }
2092
2093 /* Make a copy of the address, and remove any internal newlines. These
2094 may be present as a result of continuations of the header line. The
2095 white space that follows the newline must not be removed - it is part
2096 of the header. */
2097
2098 pp = recipient = store_get(ss - s + 1);
2099 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2100 *pp = 0;
2101 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2102 &domain, FALSE);
2103
2104 /* Keep a list of all the bad addresses so we can send a single
2105 error message at the end. However, an empty address is not an error;
2106 just ignore it. This can come from an empty group list like
2107
2108 To: Recipients of list:;
2109
2110 If there are no recipients at all, an error will occur later. */
2111
2112 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2113 {
2114 int len = Ustrlen(s);
2115 error_block *b = store_get(sizeof(error_block));
2116 while (len > 0 && isspace(s[len-1])) len--;
2117 b->next = NULL;
2118 b->text1 = string_printing(string_copyn(s, len));
2119 b->text2 = errmess;
2120 *bnext = b;
2121 bnext = &(b->next);
2122 }
2123
2124 /* If the recipient is already in the nonrecipients tree, it must
2125 have appeared on the command line with the option extract_addresses_
2126 remove_arguments set. Do not add it to the recipients, and keep a note
2127 that this has happened, in order to give a better error if there are
2128 no recipients left. */
2129
2130 else if (recipient != NULL)
2131 {
2132 if (tree_search(tree_nonrecipients, recipient) == NULL)
2133 receive_add_recipient(recipient, -1);
2134 else
2135 extracted_ignored = TRUE;
2136 }
2137
2138 /* Move on past this address */
2139
2140 s = ss + (*ss? 1:0);
2141 while (isspace(*s)) s++;
2142 }
2143
2144 /* If this was the bcc: header, mark it "old", which means it
2145 will be kept on the spool, but not transmitted as part of the
2146 message. */
2147
2148 if (h->type == htype_bcc)
2149 {
2150 h->type = htype_old;
2151 /****
2152 bcc_header_exists = FALSE;
2153 ****/
2154 }
2155 } /* For appropriate header line */
2156 } /* For each header line */
2157
2158 parse_allow_group = FALSE; /* Reset group syntax flags */
2159 parse_found_group = FALSE;
2160 }
2161
2162/* Now build the unique message id. This has changed several times over the
2163lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2164Retaining all the history in the comment has become too unwieldy - read
2165previous release sources if you want it.
2166
2167The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2168The first part is the current time, in seconds. The second part is the current
2169pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2170can hold a number in the range 0-3843. It used to be a computed sequence
2171number, but is now the fractional component of the current time in units of
21721/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2173received, Exim ensures that the timer has ticked at the appropriate level
2174before proceeding, to avoid duplication if the pid happened to be re-used
2175within the same time period. It seems likely that most messages will take at
2176least half a millisecond to be received, so no delay will normally be
2177necessary. At least for some time...
2178
2179There is a modification when localhost_number is set. Formerly this was allowed
2180to be as large as 255. Now it is restricted to the range 0-16, and the final
2181component of the message id becomes (localhost_number * 200) + fractional time
2182in units of 1/200 of a second (i.e. a value in the range 0-3399).
2183
2184Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2185Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2186still allows the tttttt field to hold a large enough number to last for some
2187more decades, and the final two-digit field can hold numbers up to 1295, which
2188is enough for milliseconds (instead of 1/2000 of a second).
2189
2190However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2191pid, so it is probably safe because pids have to be positive. The
2192localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2193final field becomes (localhost_number * 100) + fractional time in centiseconds.
2194
2195Note that string_base62() returns its data in a static storage block, so it
2196must be copied before calling string_base62() again. It always returns exactly
21976 characters.
2198
2199There doesn't seem to be anything in the RFC which requires a message id to
2200start with a letter, but Smail was changed to ensure this. The external form of
2201the message id (as supplied by string expansion) therefore starts with an
2202additional leading 'E'. The spool file names do not include this leading
2203letter and it is not used internally.
2204
2205NOTE: If ever the format of message ids is changed, the regular expression for
2206checking that a string is in this format must be updated in a corresponding
2207way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2208must also be changed to reflect the correct string length. Then, of course,
2209other programs that rely on the message id format will need updating too. */
2210
2211Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2212message_id[6] = '-';
2213Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2214
2215/* Deal with the case where the host number is set. The value of the number was
2216checked when it was read, to ensure it isn't too big. The timing granularity is
2217left in id_resolution so that an appropriate wait can be done after receiving
2218the message, if necessary (we hope it won't be). */
2219
2220if (host_number_string != NULL)
2221 {
2222 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2223 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2224 string_base62((long int)(
2225 host_number * (1000000/id_resolution) +
2226 message_id_tv.tv_usec/id_resolution)) + 4);
2227 }
2228
2229/* Host number not set: final field is just the fractional time at an
2230appropriate resolution. */
2231
2232else
2233 {
2234 id_resolution = (BASE_62 == 62)? 500 : 1000;
2235 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2236 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2237 }
2238
2239/* Add the current message id onto the current process info string if
2240it will fit. */
2241
2242(void)string_format(process_info + process_info_len,
2243 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2244
2245/* If we are using multiple input directories, set up the one for this message
2246to be the least significant base-62 digit of the time of arrival. Otherwise
2247ensure that it is an empty string. */
2248
2249message_subdir[0] = split_spool_directory? message_id[5] : 0;
2250
2251/* Now that we have the message-id, if there is no message-id: header, generate
2252one, but only for local or submission mode messages. This can be
2253user-configured if required, but we had better flatten any illegal characters
2254therein. */
2255
2256if (msgid_header == NULL && (sender_host_address == NULL || submission_mode))
2257 {
2258 uschar *p;
2259 uschar *id_text = US"";
2260 uschar *id_domain = primary_hostname;
2261
2262 /* Permit only letters, digits, dots, and hyphens in the domain */
2263
2264 if (message_id_domain != NULL)
2265 {
2266 uschar *new_id_domain = expand_string(message_id_domain);
2267 if (new_id_domain == NULL)
2268 {
2269 if (!expand_string_forcedfail)
2270 log_write(0, LOG_MAIN|LOG_PANIC,
2271 "expansion of \"%s\" (message_id_header_domain) "
2272 "failed: %s", message_id_domain, expand_string_message);
2273 }
2274 else if (*new_id_domain != 0)
2275 {
2276 id_domain = new_id_domain;
2277 for (p = id_domain; *p != 0; p++)
2278 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2279 }
2280 }
2281
2282 /* Permit all characters except controls and RFC 2822 specials in the
2283 additional text part. */
2284
2285 if (message_id_text != NULL)
2286 {
2287 uschar *new_id_text = expand_string(message_id_text);
2288 if (new_id_text == NULL)
2289 {
2290 if (!expand_string_forcedfail)
2291 log_write(0, LOG_MAIN|LOG_PANIC,
2292 "expansion of \"%s\" (message_id_header_text) "
2293 "failed: %s", message_id_text, expand_string_message);
2294 }
2295 else if (*new_id_text != 0)
2296 {
2297 id_text = new_id_text;
2298 for (p = id_text; *p != 0; p++)
2299 if (mac_iscntrl_or_special(*p)) *p = '-';
2300 }
2301 }
2302
2303 /* Add the header line */
2304
2305 header_add(htype_id, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix,
2306 message_id_external, (*id_text == 0)? "" : ".", id_text, id_domain);
2307 }
2308
2309/* If we are to log recipients, keep a copy of the raw ones before any possible
2310rewriting. Must copy the count, because later ACLs and the local_scan()
2311function may mess with the real recipients. */
2312
2313if ((log_extra_selector & LX_received_recipients) != 0)
2314 {
2315 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2316 for (i = 0; i < recipients_count; i++)
2317 raw_recipients[i] = string_copy(recipients_list[i].address);
2318 raw_recipients_count = recipients_count;
2319 }
2320
2321/* Ensure the recipients list is fully qualified and rewritten. Unqualified
2322recipients will get here only if the conditions were right (allow_unqualified_
2323recipient is TRUE). */
2324
2325for (i = 0; i < recipients_count; i++)
2326 recipients_list[i].address =
2327 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2328 global_rewrite_rules, rewrite_existflags);
2329
2330/* If there is no From: header, generate one for local or submission_mode
2331messages. If there is no sender address, but the sender is local or this is a
2332local delivery error, use the originator login. This shouldn't happen for
2333genuine bounces, but might happen for autoreplies. The addition of From: must
2334be done *before* checking for the possible addition of a Sender: header,
2335because untrusted_set_sender allows an untrusted user to set anything in the
2336envelope (which might then get info From:) but we still want to ensure a valid
2337Sender: if it is required. */
2338
2339if (from_header == NULL && (sender_host_address == NULL || submission_mode))
2340 {
2fe1a124
PH
2341 uschar *oname = US"";
2342
2343 /* Use the originator_name if this is a locally submitted message and the
2344 caller is not trusted. For trusted callers, use it only if -F was used to
2345 force its value or if we have a non-SMTP message for which -f was not used
2346 to set the sender. */
2347
2348 if (sender_host_address == NULL)
2349 {
2350 if (!trusted_caller || sender_name_forced ||
2351 (!smtp_input && !sender_address_forced))
2352 oname = originator_name;
2353 }
2354
2355 /* For non-locally submitted messages, the only time we use the originator
2356 name is when it was forced by the /name= option on control=submission. */
2357
2358 else
2359 {
2360 if (submission_name != NULL) oname = submission_name;
2361 }
2362
059ec3d9
PH
2363 /* Envelope sender is empty */
2364
2365 if (sender_address[0] == 0)
2366 {
87ba3f5f
PH
2367 uschar *fromstart, *fromend;
2368
2369 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2fe1a124
PH
2370 oname, (oname[0] == 0)? "" : " <");
2371 fromend = (oname[0] == 0)? US"" : US">";
87ba3f5f 2372
059ec3d9
PH
2373 if (sender_local || local_error_message)
2374 {
87ba3f5f
PH
2375 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2376 local_part_quote(originator_login), qualify_domain_sender,
2377 fromend);
059ec3d9
PH
2378 }
2379 else if (submission_mode && authenticated_id != NULL)
2380 {
2381 if (submission_domain == NULL)
2382 {
87ba3f5f
PH
2383 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2384 local_part_quote(authenticated_id), qualify_domain_sender,
2385 fromend);
059ec3d9
PH
2386 }
2387 else if (submission_domain[0] == 0) /* empty => whole address set */
2388 {
87ba3f5f
PH
2389 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2390 fromend);
059ec3d9
PH
2391 }
2392 else
2393 {
87ba3f5f
PH
2394 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2395 local_part_quote(authenticated_id), submission_domain,
2396 fromend);
059ec3d9
PH
2397 }
2398 from_header = header_last; /* To get it checked for Sender: */
2399 }
2400 }
2401
2402 /* There is a non-null envelope sender. Build the header using the original
2403 sender address, before any rewriting that might have been done while
2404 verifying it. */
2405
2406 else
2407 {
87ba3f5f 2408 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2fe1a124
PH
2409 oname,
2410 (oname[0] == 0)? "" : " <",
87ba3f5f
PH
2411 (sender_address_unrewritten == NULL)?
2412 sender_address : sender_address_unrewritten,
2fe1a124 2413 (oname[0] == 0)? "" : ">");
059ec3d9
PH
2414
2415 from_header = header_last; /* To get it checked for Sender: */
2416 }
2417 }
2418
2419
2420/* If the sender is local, or if we are in submission mode and there is an
2421authenticated_id, check that an existing From: is correct, and if not, generate
2422a Sender: header, unless disabled. Any previously-existing Sender: header was
2423removed above. Note that sender_local, as well as being TRUE if the caller of
2424exim is not trusted, is also true if a trusted caller did not supply a -f
2425argument for non-smtp input. To allow trusted callers to forge From: without
2426supplying -f, we have to test explicitly here. If the From: header contains
2427more than one address, then the call to parse_extract_address fails, and a
2428Sender: header is inserted, as required. */
2429
2430if (from_header != NULL &&
69358f02
PH
2431 (active_local_from_check &&
2432 ((sender_local && !trusted_caller) ||
2433 (submission_mode && authenticated_id != NULL))
059ec3d9
PH
2434 ))
2435 {
2436 BOOL make_sender = TRUE;
2437 int start, end, domain;
2438 uschar *errmess;
2439 uschar *from_address =
2440 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2441 &start, &end, &domain, FALSE);
2442 uschar *generated_sender_address;
2443
2444 if (submission_mode)
2445 {
2446 if (submission_domain == NULL)
2447 {
2448 generated_sender_address = string_sprintf("%s@%s",
2449 local_part_quote(authenticated_id), qualify_domain_sender);
2450 }
2451 else if (submission_domain[0] == 0) /* empty => full address */
2452 {
2453 generated_sender_address = string_sprintf("%s",
2454 authenticated_id);
2455 }
2456 else
2457 {
2458 generated_sender_address = string_sprintf("%s@%s",
2459 local_part_quote(authenticated_id), submission_domain);
2460 }
2461 }
2462 else
2463 generated_sender_address = string_sprintf("%s@%s",
2464 local_part_quote(originator_login), qualify_domain_sender);
2465
2466 /* Remove permitted prefixes and suffixes from the local part of the From:
2467 address before doing the comparison with the generated sender. */
2468
2469 if (from_address != NULL)
2470 {
2471 int slen;
2472 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2473
2474 if (at != NULL) *at = 0;
2475 from_address += route_check_prefix(from_address, local_from_prefix);
2476 slen = route_check_suffix(from_address, local_from_suffix);
2477 if (slen > 0)
2478 {
2479 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2480 from_address += slen;
2481 }
2482 if (at != NULL) *at = '@';
2483
2484 if (strcmpic(generated_sender_address, from_address) == 0 ||
2485 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2486 make_sender = FALSE;
2487 }
2488
2489 /* We have to cause the Sender header to be rewritten if there are
2490 appropriate rewriting rules. */
2491
2492 if (make_sender)
2493 {
2fe1a124 2494 if (submission_mode && submission_name == NULL)
059ec3d9
PH
2495 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2496 generated_sender_address);
2497 else
2498 header_add(htype_sender, "%sSender: %s <%s>\n",
2fe1a124
PH
2499 resent_prefix,
2500 submission_mode? submission_name : originator_name,
2501 generated_sender_address);
059ec3d9 2502 }
87ba3f5f
PH
2503
2504 /* Ensure that a non-null envelope sender address corresponds to the
2505 submission mode sender address. */
2506
2507 if (submission_mode && sender_address[0] != 0)
2508 {
2509 if (sender_address_unrewritten == NULL)
2510 sender_address_unrewritten = sender_address;
2511 sender_address = generated_sender_address;
2512 log_write(L_address_rewrite, LOG_MAIN,
2513 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2514 sender_address_unrewritten, generated_sender_address);
2515 }
059ec3d9
PH
2516 }
2517
2518
2519/* If there are any rewriting rules, apply them to the sender address, unless
2520it has already been rewritten as part of verification for SMTP input. */
2521
2522if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2523 sender_address[0] != 0)
2524 {
2525 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2526 global_rewrite_rules, rewrite_existflags);
2527 DEBUG(D_receive|D_rewrite)
2528 debug_printf("rewritten sender = %s\n", sender_address);
2529 }
2530
2531
2532/* The headers must be run through rewrite_header(), because it ensures that
2533addresses are fully qualified, as well as applying any rewriting rules that may
2534exist.
2535
2536Qualification of header addresses in a message from a remote host happens only
2537if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2538appropriate. For local messages, qualification always happens, unless -bnq is
2539used to explicitly suppress it. No rewriting is done for an unqualified address
2540that is left untouched.
2541
2542We start at the second header, skipping our own Received:. This rewriting is
2543documented as happening *after* recipient addresses are taken from the headers
2544by the -t command line option. An added Sender: gets rewritten here. */
2545
2546for (h = header_list->next; h != NULL; h = h->next)
2547 {
2548 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2549 rewrite_existflags, TRUE);
2550 if (newh != NULL) h = newh;
2551 }
2552
2553
2554/* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2555"cc", or "bcc". Note that although the minimal examples in RFC822 show just
2556"to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2557exists, this applies to the set of resent- headers rather than the normal set.
2558
2559The requirement for a recipient header has been removed in RFC 2822. Earlier
2560versions of Exim added a To: header for locally submitted messages, and an
2561empty Bcc: header for others or when always_bcc was set. In the light of the
2562changes in RFC 2822, we now always add Bcc: just in case there are still MTAs
2563out there that insist on the RFC 822 syntax.
2564
2565November 2003: While generally revising what Exim does to fix up headers, it
2566seems like a good time to remove this altogether. */
2567
2568/******
2569if (!to_or_cc_header_exists && !bcc_header_exists)
2570 header_add(htype_bcc, "Bcc:\n");
2571******/
2572
2573/* If there is no date header, generate one if the message originates locally
2574(i.e. not over TCP/IP) or the submission mode flag is set. Messages without
2575Date: are not valid, but it seems to be more confusing if Exim adds one to
2576all remotely-originated messages. */
2577
2578if (!date_header_exists && (sender_host_address == NULL || submission_mode))
2579 header_add(htype_other, "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2580
2581search_tidyup(); /* Free any cached resources */
2582
2583/* Show the complete set of headers if debugging. Note that the first one (the
2584new Received:) has not yet been set. */
2585
2586DEBUG(D_receive)
2587 {
2588 debug_printf(">>Headers after rewriting and local additions:\n");
2589 for (h = header_list->next; h != NULL; h = h->next)
2590 debug_printf("%c %s", h->type, h->text);
2591 debug_printf("\n");
2592 }
2593
2594/* The headers are now complete in store. If we are running in filter
2595testing mode, that is all this function does. Return TRUE if the message
2596ended with a dot. */
2597
f05da2e8 2598if (filter_test != FTEST_NONE)
059ec3d9
PH
2599 {
2600 process_info[process_info_len] = 0;
2601 return message_ended == END_DOT;
2602 }
2603
2604/* Open a new spool file for the data portion of the message. We need
2605to access it both via a file descriptor and a stream. Try to make the
2606directory if it isn't there. Note re use of sprintf: spool_directory
2607is checked on input to be < 200 characters long. */
2608
2609sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory, message_subdir,
2610 message_id);
2611data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2612if (data_fd < 0)
2613 {
2614 if (errno == ENOENT)
2615 {
2616 uschar temp[16];
2617 sprintf(CS temp, "input/%s", message_subdir);
2618 if (message_subdir[0] == 0) temp[5] = 0;
2619 (void)directory_make(spool_directory, temp, INPUT_DIRECTORY_MODE, TRUE);
2620 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
2621 }
2622 if (data_fd < 0)
2623 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
2624 spool_name, strerror(errno));
2625 }
2626
2627/* Make sure the file's group is the Exim gid, and double-check the mode
2628because the group setting doesn't always get set automatically. */
2629
ff790e47
PH
2630(void)fchown(data_fd, exim_uid, exim_gid);
2631(void)fchmod(data_fd, SPOOL_MODE);
059ec3d9
PH
2632
2633/* We now have data file open. Build a stream for it and lock it. We lock only
2634the first line of the file (containing the message ID) because otherwise there
2635are problems when Exim is run under Cygwin (I'm told). See comments in
2636spool_in.c, where the same locking is done. */
2637
2638data_file = fdopen(data_fd, "w+");
2639lock_data.l_type = F_WRLCK;
2640lock_data.l_whence = SEEK_SET;
2641lock_data.l_start = 0;
2642lock_data.l_len = SPOOL_DATA_START_OFFSET;
2643
2644if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
2645 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
2646 errno, strerror(errno));
2647
2648/* We have an open, locked data file. Write the message id to it to make it
2649self-identifying. Then read the remainder of the input of this message and
2650write it to the data file. If the variable next != NULL, it contains the first
2651data line (which was read as a header but then turned out not to have the right
2652format); write it (remembering that it might contain binary zeros). The result
2653of fwrite() isn't inspected; instead we call ferror() below. */
2654
2655fprintf(data_file, "%s-D\n", message_id);
2656if (next != NULL)
2657 {
2658 uschar *s = next->text;
2659 int len = next->slen;
f1e894f3 2660 (void)fwrite(s, 1, len, data_file);
059ec3d9
PH
2661 body_linecount++; /* Assumes only 1 line */
2662 }
2663
2664/* Note that we might already be at end of file, or the logical end of file
2665(indicated by '.'), or might have encountered an error while writing the
2666message id or "next" line. */
2667
2668if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
2669 {
2670 if (smtp_input)
2671 {
2672 message_ended = read_message_data_smtp(data_file);
2673 receive_linecount++; /* The terminating "." line */
2674 }
2675 else message_ended = read_message_data(data_file);
2676
2677 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2e0c1448 2678 message_linecount += body_linecount;
059ec3d9
PH
2679
2680 /* Handle premature termination of SMTP */
2681
2682 if (smtp_input && message_ended == END_EOF)
2683 {
2684 Uunlink(spool_name); /* Lose data file when closed */
2685 message_id[0] = 0; /* Indicate no message accepted */
2686 smtp_reply = handle_lost_connection(US"");
2687 smtp_yield = FALSE;
2688 goto TIDYUP; /* Skip to end of function */
2689 }
2690
2691 /* Handle message that is too big. Don't use host_or_ident() in the log
2692 message; we want to see the ident value even for non-remote messages. */
2693
2694 if (message_ended == END_SIZE)
2695 {
2696 Uunlink(spool_name); /* Lose the data file when closed */
2697 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2698
2699 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2700 "message too big: read=%d max=%d",
2701 sender_address,
2702 (sender_fullhost == NULL)? "" : " H=",
2703 (sender_fullhost == NULL)? US"" : sender_fullhost,
2704 (sender_ident == NULL)? "" : " U=",
2705 (sender_ident == NULL)? US"" : sender_ident,
2706 message_size,
2707 thismessage_size_limit);
2708
2709 if (smtp_input)
2710 {
2711 smtp_reply = US"552 Message size exceeds maximum permitted";
2712 message_id[0] = 0; /* Indicate no message accepted */
2713 goto TIDYUP; /* Skip to end of function */
2714 }
2715 else
2716 {
2717 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2718 give_local_error(ERRMESS_TOOBIG,
2719 string_sprintf("message too big (max=%d)", thismessage_size_limit),
2720 US"message rejected: ", error_rc, data_file, header_list);
2721 /* Does not return */
2722 }
2723 }
2724 }
2725
2726/* Restore the standard SIGALRM handler for any subsequent processing. (For
2727example, there may be some expansion in an ACL that uses a timer.) */
2728
2729os_non_restarting_signal(SIGALRM, sigalrm_handler);
2730
2731/* The message body has now been read into the data file. Call fflush() to
2732empty the buffers in C, and then call fsync() to get the data written out onto
2733the disk, as fflush() doesn't do this (or at least, it isn't documented as
2734having to do this). If there was an I/O error on either input or output,
2735attempt to send an error message, and unlink the spool file. For non-SMTP input
2736we can then give up. Note that for SMTP input we must swallow the remainder of
2737the input in cases of output errors, since the far end doesn't expect to see
2738anything until the terminating dot line is sent. */
2739
2740if (fflush(data_file) == EOF || ferror(data_file) ||
2741 fsync(fileno(data_file)) < 0 || (receive_ferror)())
2742 {
2743 uschar *msg_errno = US strerror(errno);
2744 BOOL input_error = (receive_ferror)() != 0;
2745 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
2746 input_error? "Input read" : "Spool write",
2747 msg_errno,
2748 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
2749
2750 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
2751 Uunlink(spool_name); /* Lose the data file */
2752
2753 if (smtp_input)
2754 {
2755 if (input_error)
2756 smtp_reply = US"451 Error while reading input data";
2757 else
2758 {
2759 smtp_reply = US"451 Error while writing spool file";
2760 receive_swallow_smtp();
2761 }
2762 message_id[0] = 0; /* Indicate no message accepted */
2763 goto TIDYUP; /* Skip to end of function */
2764 }
2765
2766 else
2767 {
2768 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2769 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
2770 header_list);
2771 /* Does not return */
2772 }
2773 }
2774
2775
2776/* No I/O errors were encountered while writing the data file. */
2777
2778DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
2779
2780
2781/* If there were any bad addresses extracted by -t, or there were no recipients
2782left after -t, send a message to the sender of this message, or write it to
2783stderr if the error handling option is set that way. Note that there may
2784legitimately be no recipients for an SMTP message if they have all been removed
2785by "discard".
2786
2787We need to rewind the data file in order to read it. In the case of no
2788recipients or stderr error writing, throw the data file away afterwards, and
2789exit. (This can't be SMTP, which always ensures there's at least one
2790syntactically good recipient address.) */
2791
2792if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
2793 {
2794 DEBUG(D_receive)
2795 {
2796 if (recipients_count == 0) debug_printf("*** No recipients\n");
2797 if (bad_addresses != NULL)
2798 {
2799 error_block *eblock = bad_addresses;
2800 debug_printf("*** Bad address(es)\n");
2801 while (eblock != NULL)
2802 {
2803 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
2804 eblock = eblock->next;
2805 }
2806 }
2807 }
2808
2809 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
2810
2811 /* If configured to send errors to the sender, but this fails, force
2812 a failure error code. We use a special one for no recipients so that it
2813 can be detected by the autoreply transport. Otherwise error_rc is set to
2814 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2815 it is EXIT_SUCCESS. */
2816
2817 if (error_handling == ERRORS_SENDER)
2818 {
2819 if (!moan_to_sender(
2820 (bad_addresses == NULL)?
2821 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
2822 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
2823 bad_addresses, header_list, data_file, FALSE))
2824 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
2825 }
2826 else
2827 {
2828 if (bad_addresses == NULL)
2829 {
2830 if (extracted_ignored)
2831 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
2832 else
2833 fprintf(stderr, "exim: no recipients in message\n");
2834 }
2835 else
2836 {
2837 fprintf(stderr, "exim: invalid address%s",
2838 (bad_addresses->next == NULL)? ":" : "es:\n");
2839 while (bad_addresses != NULL)
2840 {
2841 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
2842 bad_addresses->text2);
2843 bad_addresses = bad_addresses->next;
2844 }
2845 }
2846 }
2847
2848 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
2849 {
2850 Uunlink(spool_name);
f1e894f3 2851 (void)fclose(data_file);
059ec3d9
PH
2852 exim_exit(error_rc);
2853 }
2854 }
2855
2856/* Data file successfully written. Generate text for the Received: header by
2857expanding the configured string, and adding a timestamp. By leaving this
2858operation till now, we ensure that the timestamp is the time that message
2859reception was completed. However, this is deliberately done before calling the
2860data ACL and local_scan().
2861
2862This Received: header may therefore be inspected by the data ACL and by code in
2863the local_scan() function. When they have run, we update the timestamp to be
2864the final time of reception.
2865
2866If there is just one recipient, set up its value in the $received_for variable
2867for use when we generate the Received: header.
2868
2869Note: the checking for too many Received: headers is handled by the delivery
2870code. */
2871
2872timestamp = expand_string(US"${tod_full}");
2873if (recipients_count == 1) received_for = recipients_list[0].address;
2874received = expand_string(received_header_text);
2875received_for = NULL;
2876
2877if (received == NULL)
2878 {
2879 Uunlink(spool_name); /* Lose the data file */
2880 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
2881 "(received_header_text) failed: %s", string_printing(received_header_text),
2882 expand_string_message);
2883 }
2884
2885/* The first element on the header chain is reserved for the Received header,
2886so all we have to do is fill in the text pointer, and set the type. However, if
2887the result of the expansion is an empty string, we leave the header marked as
2888"old" so as to refrain from adding a Received header. */
2889
2890if (received[0] == 0)
2891 {
2892 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
2893 received_header->type = htype_old;
2894 }
2895else
2896 {
2897 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
2898 received_header->type = htype_received;
2899 }
2900
2901received_header->slen = Ustrlen(received_header->text);
2902
2903DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
2904 received_header->type, received_header->text);
2905
2906/* Set the value of message_body_size for the DATA ACL and for local_scan() */
2907
2908message_body_size = (fstat(data_fd, &statbuf) == 0)?
2909 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
2910
2911/* If an ACL from any RCPT commands set up any warning headers to add, do so
2912now, before running the DATA ACL. */
2913
2914add_acl_headers(US"MAIL or RCPT");
2915
2916/* If an ACL is specified for checking things at this stage of reception of a
2917message, run it, unless all the recipients were removed by "discard" in earlier
2918ACLs. That is the only case in which recipients_count can be zero at this
2919stage. Set deliver_datafile to point to the data file so that $message_body and
2920$message_body_end can be extracted if needed. Allow $recipients in expansions.
2921*/
2922
2923deliver_datafile = data_fd;
2924
2925if (recipients_count == 0)
2926 {
2927 blackholed_by = recipients_discarded? US"MAIL ACL" : US"RCPT ACL";
2928 }
2929else
2930 {
2931 enable_dollar_recipients = TRUE;
2932
2933 /* Handle interactive SMTP messages */
2934
2935 if (smtp_input && !smtp_batched_input)
2936 {
8523533c 2937
fb2274d4
TK
2938#ifdef EXPERIMENTAL_DOMAINKEYS
2939 dk_exim_verify_finish();
2940#endif
2941
8523533c 2942#ifdef WITH_CONTENT_SCAN
54cdb463
PH
2943 if (acl_smtp_mime != NULL &&
2944 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
2945 goto TIDYUP;
8523533c
TK
2946#endif /* WITH_CONTENT_SCAN */
2947
54cdb463
PH
2948 /* Check the recipients count again, as the MIME ACL might have changed
2949 them. */
8523533c 2950
059ec3d9
PH
2951 if (acl_smtp_data != NULL && recipients_count > 0)
2952 {
2953 uschar *user_msg, *log_msg;
2954 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
2955 add_acl_headers(US"DATA");
2956 if (rc == DISCARD)
2957 {
2958 recipients_count = 0;
2959 blackholed_by = US"DATA ACL";
8e669ac1
PH
2960 if (log_msg != NULL)
2961 blackhole_log_msg = string_sprintf(": %s", log_msg);
059ec3d9
PH
2962 }
2963 else if (rc != OK)
2964 {
2965 Uunlink(spool_name);
8523533c
TK
2966#ifdef WITH_CONTENT_SCAN
2967 unspool_mbox();
2968#endif
059ec3d9
PH
2969 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
2970 smtp_yield = FALSE; /* No more messsages after dropped connection */
2971 smtp_reply = US""; /* Indicate reply already sent */
2972 message_id[0] = 0; /* Indicate no message accepted */
2973 goto TIDYUP; /* Skip to end of function */
2974 }
2975 }
2976 }
2977
2978 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
2979 we cannot take different actions for permanent and temporary rejections. */
2980
54cdb463 2981 else
059ec3d9 2982 {
54cdb463
PH
2983
2984#ifdef WITH_CONTENT_SCAN
2985 if (acl_not_smtp_mime != NULL &&
2986 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
2987 &blackholed_by))
2988 goto TIDYUP;
2989#endif /* WITH_CONTENT_SCAN */
2990
2991 if (acl_not_smtp != NULL)
059ec3d9 2992 {
54cdb463
PH
2993 uschar *user_msg, *log_msg;
2994 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
2995 if (rc == DISCARD)
059ec3d9 2996 {
54cdb463
PH
2997 recipients_count = 0;
2998 blackholed_by = US"non-SMTP ACL";
2999 if (log_msg != NULL)
3000 blackhole_log_msg = string_sprintf(": %s", log_msg);
059ec3d9 3001 }
54cdb463 3002 else if (rc != OK)
059ec3d9 3003 {
54cdb463
PH
3004 Uunlink(spool_name);
3005#ifdef WITH_CONTENT_SCAN
3006 unspool_mbox();
3007#endif
3008 log_write(0, LOG_MAIN|LOG_REJECT, "F=<%s> rejected by non-SMTP ACL: %s",
3009 sender_address, log_msg);
3010 if (user_msg == NULL) user_msg = US"local configuration problem";
3011 if (smtp_batched_input)
3012 {
3013 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3014 /* Does not return */
3015 }
3016 else
3017 {
3018 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3019 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3020 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3021 header_list);
3022 /* Does not return */
3023 }
059ec3d9 3024 }
54cdb463 3025 add_acl_headers(US"non-SMTP");
059ec3d9 3026 }
059ec3d9
PH
3027 }
3028
54cdb463
PH
3029 /* The applicable ACLs have been run */
3030
059ec3d9
PH
3031 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3032 if (queue_only_policy) queued_by = US"ACL";
3033
3034 enable_dollar_recipients = FALSE;
3035 }
3036
8523533c
TK
3037#ifdef WITH_CONTENT_SCAN
3038unspool_mbox();
3039#endif
3040
059ec3d9
PH
3041/* The final check on the message is to run the scan_local() function. The
3042version supplied with Exim always accepts, but this is a hook for sysadmins to
3043supply their own checking code. The local_scan() function is run even when all
3044the recipients have been discarded. */
3045
3046lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3047
3048/* Arrange to catch crashes in local_scan(), so that the -D file gets
3049deleted, and the incident gets logged. */
3050
3051os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3052os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3053os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3054os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3055
3056DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3057 local_scan_timeout);
3058local_scan_data = NULL;
3059
3060os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3061if (local_scan_timeout > 0) alarm(local_scan_timeout);
3062rc = local_scan(data_fd, &local_scan_data);
3063alarm(0);
3064os_non_restarting_signal(SIGALRM, sigalrm_handler);
3065
3066store_pool = POOL_MAIN; /* In case changed */
3067DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3068 local_scan_data);
3069
3070os_non_restarting_signal(SIGSEGV, SIG_DFL);
3071os_non_restarting_signal(SIGFPE, SIG_DFL);
3072os_non_restarting_signal(SIGILL, SIG_DFL);
3073os_non_restarting_signal(SIGBUS, SIG_DFL);
3074
3075/* The length check is paranoia against some runaway code, and also because
3076(for a success return) lines in the spool file are read into big_buffer. */
3077
3078if (local_scan_data != NULL)
3079 {
3080 int len = Ustrlen(local_scan_data);
3081 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3082 local_scan_data = string_copyn(local_scan_data, len);
3083 }
3084
3085if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3086 {
3087 if (!deliver_freeze) /* ACL might have already frozen */
3088 {
3089 deliver_freeze = TRUE;
3090 deliver_frozen_at = time(NULL);
3091 frozen_by = US"local_scan()";
3092 }
3093 rc = LOCAL_SCAN_ACCEPT;
3094 }
3095else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3096 {
3097 if (!queue_only_policy) /* ACL might have already queued */
3098 {
3099 queue_only_policy = TRUE;
3100 queued_by = US"local_scan()";
3101 }
3102 rc = LOCAL_SCAN_ACCEPT;
3103 }
3104
3105/* Message accepted: remove newlines in local_scan_data because otherwise
3106the spool file gets corrupted. Ensure that all recipients are qualified. */
3107
3108if (rc == LOCAL_SCAN_ACCEPT)
3109 {
3110 if (local_scan_data != NULL)
3111 {
3112 uschar *s;
3113 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3114 }
3115 for (i = 0; i < recipients_count; i++)
3116 {
3117 recipient_item *r = recipients_list + i;
3118 r->address = rewrite_address_qualify(r->address, TRUE);
3119 if (r->errors_to != NULL)
3120 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3121 }
3122 if (recipients_count == 0 && blackholed_by == NULL)
3123 blackholed_by = US"local_scan";
3124 }
3125
3126/* Message rejected: newlines permitted in local_scan_data to generate
3127multiline SMTP responses. */
3128
3129else
3130 {
3131 uschar *istemp = US"";
3132 uschar *s = NULL;
3133 int size = 0;
3134 int sptr = 0;
3135 int code;
3136
3137 errmsg = local_scan_data;
3138
3139 Uunlink(spool_name); /* Cancel this message */
3140 switch(rc)
3141 {
3142 default:
3143 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3144 "rejection given", rc);
3145 goto TEMPREJECT;
3146
3147 case LOCAL_SCAN_REJECT_NOLOGHDR:
3148 log_extra_selector &= ~LX_rejected_header;
3149 /* Fall through */
3150
3151 case LOCAL_SCAN_REJECT:
3152 code = 550;
3153 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3154 break;
3155
3156 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3157 log_extra_selector &= ~LX_rejected_header;
3158 /* Fall through */
3159
3160 case LOCAL_SCAN_TEMPREJECT:
3161 TEMPREJECT:
3162 code = 451;
3163 if (errmsg == NULL) errmsg = US"Temporary local problem";
3164 istemp = US"temporarily ";
3165 break;
3166 }
3167
3168 s = string_append(s, &size, &sptr, 2, US"F=",
3169 (sender_address[0] == 0)? US"<>" : sender_address);
3170 s = add_host_info_for_log(s, &size, &sptr);
3171 s[sptr] = 0;
3172
3173 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3174 s, istemp, string_printing(errmsg));
3175
3176 if (smtp_input)
3177 {
3178 if (!smtp_batched_input)
3179 {
3180 smtp_respond(code, TRUE, errmsg);
3181 message_id[0] = 0; /* Indicate no message accepted */
3182 smtp_reply = US""; /* Indicate reply already sent */
3183 goto TIDYUP; /* Skip to end of function */
3184 }
3185 else
3186 {
3187 moan_smtp_batch(NULL, "%d %s", code, errmsg);
3188 /* Does not return */
3189 }
3190 }
3191 else
3192 {
3193 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3194 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3195 US"message rejected by local scan code: ", error_rc, data_file,
3196 header_list);
3197 /* Does not return */
3198 }
3199 }
3200
3201/* Reset signal handlers to ignore signals that previously would have caused
3202the message to be abandoned. */
3203
3204signal(SIGTERM, SIG_IGN);
3205signal(SIGINT, SIG_IGN);
3206
3207/* Ensure the first time flag is set in the newly-received message. */
3208
3209deliver_firsttime = TRUE;
3210
8523533c
TK
3211#ifdef EXPERIMENTAL_BRIGHTMAIL
3212if (bmi_run == 1) {
3213 /* rewind data file */
3214 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3215 bmi_verdicts = bmi_process_message(header_list, data_fd);
3216};
3217#endif
3218
059ec3d9
PH
3219/* Update the timstamp in our Received: header to account for any time taken by
3220an ACL or by local_scan(). The new time is the time that all reception
3221processing is complete. */
3222
3223timestamp = expand_string(US"${tod_full}");
3224tslen = Ustrlen(timestamp);
3225
3226memcpy(received_header->text + received_header->slen - tslen - 1,
3227 timestamp, tslen);
3228
3229/* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3230
3231if (mua_wrapper)
3232 {
3233 deliver_freeze = FALSE;
3234 queue_only_policy = FALSE;
3235 }
3236
3237/* Keep the data file open until we have written the header file, in order to
3238hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3239don't write the header file, and we unlink the data file. If writing the header
3240file fails, we have failed to accept this message. */
3241
3242if (host_checking || blackholed_by != NULL)
3243 {
3244 header_line *h;
3245 Uunlink(spool_name);
3246 msg_size = 0; /* Compute size for log line */
3247 for (h = header_list; h != NULL; h = h->next)
3248 if (h->type != '*') msg_size += h->slen;
3249 }
3250
3251/* Write the -H file */
3252
3253else
3254 {
3255 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3256 {
3257 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3258 Uunlink(spool_name); /* Lose the data file */
3259
3260 if (smtp_input)
3261 {
3262 smtp_reply = US"451 Error in writing spool file";
3263 message_id[0] = 0; /* Indicate no message accepted */
3264 goto TIDYUP;
3265 }
3266 else
3267 {
3268 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3269 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3270 header_list);
3271 /* Does not return */
3272 }
3273 }
3274 }
3275
3276
3277/* The message has now been successfully received. */
3278
3279receive_messagecount++;
3280
3281/* In SMTP sessions we may receive several in one connection. After each one,
3282we wait for the clock to tick at the level of message-id granularity. This is
3283so that the combination of time+pid is unique, even on systems where the pid
3284can be re-used within our time interval. We can't shorten the interval without
3285re-designing the message-id. See comments above where the message id is
3286created. This is Something For The Future. */
3287
3288message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3289exim_wait_tick(&message_id_tv, id_resolution);
3290
3291/* Add data size to written header size. We do not count the initial file name
3292that is in the file, but we do add one extra for the notional blank line that
3293precedes the data. This total differs from message_size in that it include the
3294added Received: header and any other headers that got created locally. */
3295
3296fflush(data_file);
3297fstat(data_fd, &statbuf);
3298
3299msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3300
3301/* Generate a "message received" log entry. We do this by building up a dynamic
3302string as required. Since we commonly want to add two items at a time, use a
3303macro to simplify the coding. We log the arrival of a new message while the
3304file is still locked, just in case the machine is *really* fast, and delivers
3305it first! Include any message id that is in the message - since the syntax of a
3306message id is actually an addr-spec, we can use the parse routine to canonicize
3307it. */
3308
3309size = 256;
3310sptr = 0;
3311s = store_get(size);
3312
3313s = string_append(s, &size, &sptr, 2, US"<= ",
3314 (sender_address[0] == 0)? US"<>" : sender_address);
3315if (message_reference != NULL)
3316 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3317
3318s = add_host_info_for_log(s, &size, &sptr);
3319
3320#ifdef SUPPORT_TLS
3321if ((log_extra_selector & LX_tls_cipher) != 0 && tls_cipher != NULL)
3322 s = string_append(s, &size, &sptr, 2, US" X=", tls_cipher);
3323if ((log_extra_selector & LX_tls_certificate_verified) != 0 &&
3324 tls_cipher != NULL)
3325 s = string_append(s, &size, &sptr, 2, US" CV=",
3326 tls_certificate_verified? "yes":"no");
3327if ((log_extra_selector & LX_tls_peerdn) != 0 && tls_peerdn != NULL)
3328 s = string_append(s, &size, &sptr, 3, US" DN=\"", tls_peerdn, US"\"");
3329#endif
3330
3331if (sender_host_authenticated != NULL)
3332 {
3333 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3334 if (authenticated_id != NULL)
3335 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3336 }
3337
3338sprintf(CS big_buffer, "%d", msg_size);
3339s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3340
3341/* If an addr-spec in a message-id contains a quoted string, it can contain
3342any characters except " \ and CR and so in particular it can contain NL!
3343Therefore, make sure we use a printing-characters only version for the log.
3344Also, allow for domain literals in the message id. */
3345
3346if (msgid_header != NULL)
3347 {
3348 uschar *old_id;
3349 BOOL save_allow_domain_literals = allow_domain_literals;
3350 allow_domain_literals = TRUE;
3351 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3352 &errmsg, &start, &end, &domain, FALSE);
3353 allow_domain_literals = save_allow_domain_literals;
3354 if (old_id != NULL)
3355 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3356 }
3357
3358/* If subject logging is turned on, create suitable printing-character
3359text. By expanding $h_subject: we make use of the MIME decoding. */
3360
3361if ((log_extra_selector & LX_subject) != 0 && subject_header != NULL)
3362 {
3363 int i;
3364 uschar *p = big_buffer;
3365 uschar *ss = expand_string(US"$h_subject:");
3366
3367 /* Backslash-quote any double quotes or backslashes so as to make a
3368 a C-like string, and turn any non-printers into escape sequences. */
3369
3370 *p++ = '\"';
3371 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3372 {
3373 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3374 *p++ = ss[i];
3375 }
3376 *p++ = '\"';
3377 *p = 0;
3378 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3379 }
3380
3381/* Terminate the string: string_cat() and string_append() leave room, but do
3382not put the zero in. */
3383
3384s[sptr] = 0;
3385
3386/* While writing to the log, set a flag to cause a call to receive_bomb_out()
3387if the log cannot be opened. */
3388
3389receive_call_bombout = TRUE;
3390log_write(0, LOG_MAIN |
3391 (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
3392 (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
3393 "%s", s);
3394receive_call_bombout = FALSE;
3395
3396/* Log any control actions taken by an ACL or local_scan(). */
3397
3398if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
3399if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
3400 "no immediate delivery: queued by %s", queued_by);
3401
3402/* Create a message log file if message logs are being used and this message is
3403not blackholed. Write the reception stuff to it. We used to leave message log
3404creation until the first delivery, but this has proved confusing for somep
3405people. */
3406
3407if (message_logs && blackholed_by == NULL)
3408 {
3409 int fd;
3410
3411 sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory, message_subdir,
3412 message_id);
3413 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3414
3415 if (fd < 0 && errno == ENOENT)
3416 {
3417 uschar temp[16];
3418 sprintf(CS temp, "msglog/%s", message_subdir);
3419 if (message_subdir[0] == 0) temp[6] = 0;
3420 (void)directory_make(spool_directory, temp, MSGLOG_DIRECTORY_MODE, TRUE);
3421 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
3422 }
3423
3424 if (fd < 0)
3425 {
3426 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
3427 spool_name, strerror(errno));
3428 }
3429
3430 else
3431 {
3432 FILE *message_log = fdopen(fd, "a");
3433 if (message_log == NULL)
3434 {
3435 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
3436 spool_name, strerror(errno));
f1e894f3 3437 (void)close(fd);
059ec3d9
PH
3438 }
3439 else
3440 {
3441 uschar *now = tod_stamp(tod_log);
3442 fprintf(message_log, "%s Received from %s\n", now, s+3);
3443 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
3444 frozen_by);
3445 if (queue_only_policy) fprintf(message_log,
3446 "%s no immediate delivery: queued by %s\n", now, queued_by);
f1e894f3 3447 (void)fclose(message_log);
059ec3d9
PH
3448 }
3449 }
3450 }
3451
3452store_reset(s); /* The store for the main log message can be reused */
3453
3454/* If the message is frozen, and freeze_tell is set, do the telling. */
3455
3456if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
3457 {
3458 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
3459 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3460 message_id, frozen_by, sender_address);
3461 }
3462
3463
3464/* Either a message has been successfully received and written to the two spool
3465files, or an error in writing the spool has occurred for an SMTP message, or
3466an SMTP message has been rejected because of a bad sender. (For a non-SMTP
3467message we will have already given up because there's no point in carrying on!)
3468In either event, we must now close (and thereby unlock) the data file. In the
3469successful case, this leaves the message on the spool, ready for delivery. In
3470the error case, the spool file will be deleted. Then tidy up store, interact
3471with an SMTP call if necessary, and return.
3472
3473A fflush() was done earlier in the expectation that any write errors on the
3474data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3475possible for fclose() to fail - but what to do? What has happened to the lock
3476if this happens? */
3477
3478TIDYUP:
f1e894f3
PH
3479process_info[process_info_len] = 0; /* Remove message id */
3480if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
059ec3d9
PH
3481
3482/* Now reset signal handlers to their defaults */
3483
3484signal(SIGTERM, SIG_DFL);
3485signal(SIGINT, SIG_DFL);
3486
3487/* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3488value, which defaults TRUE - meaning there may be more incoming messages from
3489this connection. For non-SMTP callers (where there is only ever one message),
3490the default is FALSE. */
3491
3492if (smtp_input)
3493 {
3494 yield = smtp_yield;
3495
3496 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3497 is set to the response. However, after an ACL error or local_scan() error,
3498 the response has already been sent, and smtp_reply is an empty string to
3499 indicate this. */
3500
3501 if (!smtp_batched_input)
3502 {
3503 if (smtp_reply == NULL)
3504 {
29aba418
TF
3505 if (fake_response != OK)
3506 smtp_respond(fake_response == DEFER ? 450 : 550,
3507 TRUE, fake_response_text);
8e669ac1
PH
3508 else
3509 smtp_printf("250 OK id=%s\r\n", message_id);
059ec3d9
PH
3510 if (host_checking)
3511 fprintf(stdout,
3512 "\n**** SMTP testing: that is not a real message id!\n\n");
3513 }
8523533c
TK
3514 else if (smtp_reply[0] != 0)
3515 {
29aba418
TF
3516 if (fake_response != OK && (smtp_reply[0] == '2'))
3517 smtp_respond(fake_response == DEFER ? 450 : 550,
3518 TRUE, fake_response_text);
8e669ac1 3519 else
6951ac6c
PH
3520 smtp_printf("%.1024s\r\n", smtp_reply);
3521 }
059ec3d9
PH
3522 }
3523
3524 /* For batched SMTP, generate an error message on failure, and do
3525 nothing on success. The function moan_smtp_batch() does not return -
3526 it exits from the program with a non-zero return code. */
3527
3528 else if (smtp_reply != NULL) moan_smtp_batch(NULL, "%s", smtp_reply);
3529 }
3530
3531
3532/* If blackholing, we can immediately log this message's sad fate. The data
3533file has already been unlinked, and the header file was never written to disk.
3534We must now indicate that nothing was received, to prevent a delivery from
3535starting. */
3536
3537if (blackholed_by != NULL)
3538 {
3539 uschar *detail = (local_scan_data != NULL)?
3540 string_printing(local_scan_data) :
3541 string_sprintf("(%s discarded recipients)", blackholed_by);
04f7d5b9 3542 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
059ec3d9
PH
3543 log_write(0, LOG_MAIN, "Completed");
3544 message_id[0] = 0;
3545 }
3546
3547/* Reset headers so that logging of rejects for a subsequent message doesn't
3548include them. It is also important to set header_last = NULL before exiting
3549from this function, as this prevents certain rewrites that might happen during
3550subsequent verifying (of another incoming message) from trying to add headers
3551when they shouldn't. */
3552
3553header_list = header_last = NULL;
3554
3555return yield; /* TRUE if more messages (SMTP only) */
3556}
3557
3558/* End of receive.c */