typo
[exim.git] / src / src / receive.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
f9ba5e22 5/* Copyright (c) University of Cambridge 1995 - 2018 */
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6/* See the file NOTICE for conditions of use and distribution. */
7
8/* Code for receiving a message and setting up spool files. */
9
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10#include "exim.h"
11
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12#ifdef EXPERIMENTAL_DCC
13extern int dcc_ok;
14#endif
15
4840604e 16#ifdef EXPERIMENTAL_DMARC
c007c974 17# include "dmarc.h"
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18#endif /* EXPERIMENTAL_DMARC */
19
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20/*************************************************
21* Local static variables *
22*************************************************/
23
24static FILE *data_file = NULL;
25static int data_fd = -1;
41313d92 26static uschar *spool_name = US"";
059ec3d9 27
cff70eb1 28enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
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29
30
31/*************************************************
32* Non-SMTP character reading functions *
33*************************************************/
34
35/* These are the default functions that are set up in the variables such as
36receive_getc initially. They just call the standard functions, passing stdin as
37the file. (When SMTP input is occurring, different functions are used by
38changing the pointer variables.) */
39
40int
bd8fbe36 41stdin_getc(unsigned lim)
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42{
43return getc(stdin);
44}
45
46int
47stdin_ungetc(int c)
48{
49return ungetc(c, stdin);
50}
51
52int
53stdin_feof(void)
54{
55return feof(stdin);
56}
57
58int
59stdin_ferror(void)
60{
61return ferror(stdin);
62}
63
64
65
66
67/*************************************************
68* Check that a set sender is allowed *
69*************************************************/
70
71/* This function is called when a local caller sets an explicit sender address.
72It checks whether this is permitted, which it is for trusted callers.
73Otherwise, it must match the pattern(s) in untrusted_set_sender.
74
75Arguments: the proposed sender address
76Returns: TRUE for a trusted caller
77 TRUE if the address has been set, untrusted_set_sender has been
78 set, and the address matches something in the list
79 FALSE otherwise
80*/
81
82BOOL
83receive_check_set_sender(uschar *newsender)
84{
85uschar *qnewsender;
86if (trusted_caller) return TRUE;
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87if (!newsender || !untrusted_set_sender) return FALSE;
88qnewsender = Ustrchr(newsender, '@')
89 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
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91}
92
93
94
95
96/*************************************************
5cb8cbc6 97* Read space info for a partition *
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98*************************************************/
99
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100/* This function is called by receive_check_fs() below, and also by string
101expansion for variables such as $spool_space. The field names for the statvfs
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102structure are macros, because not all OS have F_FAVAIL and it seems tidier to
103have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
104have inodes, and they return -1 for the number available.
059ec3d9 105
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106Later: It turns out that some file systems that do not have the concept of
107inodes return 0 rather than -1. Such systems should also return 0 for the total
8e669ac1 108number of inodes, so we require that to be greater than zero before returning
5cb8cbc6 109an inode count.
059ec3d9 110
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111Arguments:
112 isspool TRUE for spool partition, FALSE for log partition
113 inodeptr address of int to receive inode count; -1 if there isn't one
8e669ac1 114
5cb8cbc6 115Returns: available on-root space, in kilobytes
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116 -1 for log partition if there isn't one
117
118All values are -1 if the STATFS functions are not available.
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119*/
120
8e669ac1 121int
5cb8cbc6 122receive_statvfs(BOOL isspool, int *inodeptr)
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123{
124#ifdef HAVE_STATFS
059ec3d9 125struct STATVFS statbuf;
ddf1b11a 126struct stat dummy;
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127uschar *path;
128uschar *name;
129uschar buffer[1024];
059ec3d9 130
5cb8cbc6 131/* The spool directory must always exist. */
059ec3d9 132
5cb8cbc6 133if (isspool)
059ec3d9 134 {
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135 path = spool_directory;
136 name = US"spool";
137 }
138
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139/* Need to cut down the log file path to the directory, and to ignore any
140appearance of "syslog" in it. */
141
5cb8cbc6 142else
059ec3d9 143 {
059ec3d9 144 int sep = ':'; /* Not variable - outside scripts use */
55414b25 145 const uschar *p = log_file_path;
8e669ac1 146 name = US"log";
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147
148 /* An empty log_file_path means "use the default". This is the same as an
149 empty item in a list. */
150
151 if (*p == 0) p = US":";
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152 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
153 if (Ustrcmp(path, "syslog") != 0)
154 break;
059ec3d9 155
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156 if (path == NULL) /* No log files */
157 {
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158 *inodeptr = -1;
159 return -1;
160 }
059ec3d9 161
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162 /* An empty string means use the default, which is in the spool directory.
163 But don't just use the spool directory, as it is possible that the log
5cb8cbc6 164 subdirectory has been symbolically linked elsewhere. */
059ec3d9 165
8e669ac1 166 if (path[0] == 0)
059ec3d9 167 {
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168 sprintf(CS buffer, CS"%s/log", CS spool_directory);
169 path = buffer;
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170 }
171 else
059ec3d9 172 {
8e669ac1 173 uschar *cp;
5cb8cbc6 174 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
8e669ac1 175 }
5cb8cbc6 176 }
8e669ac1 177
8f128379 178/* We now have the path; do the business */
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179
180memset(&statbuf, 0, sizeof(statbuf));
181
182if (STATVFS(CS path, &statbuf) != 0)
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183 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
184 { /* Can happen on first run after installation */
185 *inodeptr = -1;
186 return -1;
187 }
188 else
189 {
190 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
191 "%s directory %s: %s", name, path, strerror(errno));
192 smtp_closedown(US"spool or log directory problem");
9bfb7e1b 193 exim_exit(EXIT_FAILURE, NULL);
ddf1b11a 194 }
8e669ac1 195
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196*inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
197
198/* Disks are getting huge. Take care with computing the size in kilobytes. */
8e669ac1 199
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200return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
201
ddf1b11a 202#else
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203/* Unable to find partition sizes in this environment. */
204
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205*inodeptr = -1;
206return -1;
207#endif
208}
209
059ec3d9 210
059ec3d9 211
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212
213/*************************************************
214* Check space on spool and log partitions *
215*************************************************/
216
217/* This function is called before accepting a message; if any thresholds are
218set, it checks them. If a message_size is supplied, it checks that there is
219enough space for that size plus the threshold - i.e. that the message won't
220reduce the space to the threshold. Not all OS have statvfs(); for those that
221don't, this function always returns TRUE. For some OS the old function and
222struct name statfs is used; that is handled by a macro, defined in exim.h.
223
224Arguments:
225 msg_size the (estimated) size of an incoming message
226
227Returns: FALSE if there isn't enough space, or if the information cannot
228 be obtained
229 TRUE if no check was done or there is enough space
230*/
231
232BOOL
233receive_check_fs(int msg_size)
234{
235int space, inodes;
236
237if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
238 {
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239 space = receive_statvfs(TRUE, &inodes);
240
059ec3d9 241 DEBUG(D_receive)
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242 debug_printf("spool directory space = %dK inodes = %d "
243 "check_space = %dK inodes = %d msg_size = %d\n",
244 space, inodes, check_spool_space, check_spool_inodes, msg_size);
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245
246 if ((space >= 0 && space < check_spool_space) ||
5cb8cbc6 247 (inodes >= 0 && inodes < check_spool_inodes))
8e669ac1 248 {
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249 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
250 "inodes=%d", space, inodes);
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251 return FALSE;
252 }
253 }
254
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255if (check_log_space > 0 || check_log_inodes > 0)
256 {
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257 space = receive_statvfs(FALSE, &inodes);
258
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259 DEBUG(D_receive)
260 debug_printf("log directory space = %dK inodes = %d "
261 "check_space = %dK inodes = %d\n",
262 space, inodes, check_log_space, check_log_inodes);
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263
264 if ((space >= 0 && space < check_log_space) ||
5cb8cbc6 265 (inodes >= 0 && inodes < check_log_inodes))
8e669ac1 266 {
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267 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
268 "inodes=%d", space, inodes);
269 return FALSE;
270 }
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271 }
272
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273return TRUE;
274}
275
276
277
278/*************************************************
279* Bomb out while reading a message *
280*************************************************/
281
282/* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
283received, or if there is a timeout. A rarer case might be if the log files are
284screwed up and Exim can't open them to record a message's arrival. Handling
285that case is done by setting a flag to cause the log functions to call this
286function if there is an ultimate disaster. That is why it is globally
287accessible.
288
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289Arguments:
290 reason text reason to pass to the not-quit ACL
291 msg default SMTP response to give if in an SMTP session
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292Returns: it doesn't
293*/
294
295void
8f128379 296receive_bomb_out(uschar *reason, uschar *msg)
059ec3d9 297{
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298 static BOOL already_bombing_out;
299/* The smtp_notquit_exit() below can call ACLs which can trigger recursive
300timeouts, if someone has something slow in their quit ACL. Since the only
301things we should be doing are to close down cleanly ASAP, on the second
302pass we also close down stuff that might be opened again, before bypassing
303the ACL call and exiting. */
304
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305/* If spool_name is set, it contains the name of the data file that is being
306written. Unlink it before closing so that it cannot be picked up by a delivery
307process. Ensure that any header file is also removed. */
308
ead37e6c 309if (spool_name[0] != '\0')
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310 {
311 Uunlink(spool_name);
312 spool_name[Ustrlen(spool_name) - 1] = 'H';
313 Uunlink(spool_name);
ead37e6c 314 spool_name[0] = '\0';
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315 }
316
317/* Now close the file if it is open, either as a fd or a stream. */
318
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319if (data_file != NULL)
320 {
321 (void)fclose(data_file);
322 data_file = NULL;
323} else if (data_fd >= 0) {
324 (void)close(data_fd);
325 data_fd = -1;
326 }
059ec3d9 327
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328/* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
329smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
330SMTP response. */
059ec3d9 331
ead37e6c 332if (!already_bombing_out)
059ec3d9 333 {
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334 already_bombing_out = TRUE;
335 if (smtp_input)
336 {
337 if (smtp_batched_input)
338 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
339 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
340 smtp_active_hostname, msg);
341 }
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342 }
343
344/* Exit from the program (non-BSMTP cases) */
345
9bfb7e1b 346exim_exit(EXIT_FAILURE, NULL);
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347}
348
349
350/*************************************************
351* Data read timeout *
352*************************************************/
353
354/* Handler function for timeouts that occur while reading the data that
355comprises a message.
356
357Argument: the signal number
358Returns: nothing
359*/
360
361static void
362data_timeout_handler(int sig)
363{
364uschar *msg = NULL;
365
366sig = sig; /* Keep picky compilers happy */
367
368if (smtp_input)
369 {
370 msg = US"SMTP incoming data timeout";
371 log_write(L_lost_incoming_connection,
372 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
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373 "from %s F=<%s>",
374 (sender_fullhost != NULL)? sender_fullhost : US"local process",
375 sender_address);
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376 }
377else
378 {
379 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
380 log_write(L_lost_incoming_connection,
381 LOG_MAIN, "timed out while reading local message");
382 }
383
8f128379 384receive_bomb_out(US"data-timeout", msg); /* Does not return */
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385}
386
387
388
389/*************************************************
390* local_scan() timeout *
391*************************************************/
392
393/* Handler function for timeouts that occur while running a local_scan()
394function.
395
396Argument: the signal number
397Returns: nothing
398*/
399
400static void
401local_scan_timeout_handler(int sig)
402{
403sig = sig; /* Keep picky compilers happy */
404log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
405 "message temporarily rejected (size %d)", message_size);
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406/* Does not return */
407receive_bomb_out(US"local-scan-timeout", US"local verification problem");
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408}
409
410
411
412/*************************************************
413* local_scan() crashed *
414*************************************************/
415
416/* Handler function for signals that occur while running a local_scan()
417function.
418
419Argument: the signal number
420Returns: nothing
421*/
422
423static void
424local_scan_crash_handler(int sig)
425{
426log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
427 "signal %d - message temporarily rejected (size %d)", sig, message_size);
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428/* Does not return */
429receive_bomb_out(US"local-scan-error", US"local verification problem");
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430}
431
432
433/*************************************************
434* SIGTERM or SIGINT received *
435*************************************************/
436
437/* Handler for SIGTERM or SIGINT signals that occur while reading the
438data that comprises a message.
439
440Argument: the signal number
441Returns: nothing
442*/
443
444static void
445data_sigterm_sigint_handler(int sig)
446{
447uschar *msg = NULL;
448
449if (smtp_input)
450 {
451 msg = US"Service not available - SIGTERM or SIGINT received";
452 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
453 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
454 }
455else
456 {
f05da2e8 457 if (filter_test == FTEST_NONE)
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458 {
459 fprintf(stderr, "\nexim: %s received - message abandoned\n",
460 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
461 log_write(0, LOG_MAIN, "%s received while reading local message",
462 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
463 }
464 }
465
8f128379 466receive_bomb_out(US"signal-exit", msg); /* Does not return */
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467}
468
469
470
471/*************************************************
472* Add new recipient to list *
473*************************************************/
474
475/* This function builds a list of recipient addresses in argc/argv
476format.
477
478Arguments:
479 recipient the next address to add to recipients_list
480 pno parent number for fixed aliases; -1 otherwise
481
482Returns: nothing
483*/
484
485void
486receive_add_recipient(uschar *recipient, int pno)
487{
488if (recipients_count >= recipients_list_max)
489 {
490 recipient_item *oldlist = recipients_list;
491 int oldmax = recipients_list_max;
492 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
493 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
494 if (oldlist != NULL)
495 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
496 }
497
498recipients_list[recipients_count].address = recipient;
499recipients_list[recipients_count].pno = pno;
8523533c
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500#ifdef EXPERIMENTAL_BRIGHTMAIL
501recipients_list[recipients_count].bmi_optin = bmi_current_optin;
502/* reset optin string pointer for next recipient */
503bmi_current_optin = NULL;
504#endif
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505recipients_list[recipients_count].orcpt = NULL;
506recipients_list[recipients_count].dsn_flags = 0;
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507recipients_list[recipients_count++].errors_to = NULL;
508}
509
510
511
512
513/*************************************************
fd98a5c6
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514* Send user response message *
515*************************************************/
61147df4 516
fd98a5c6
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517/* This function is passed a default response code and a user message. It calls
518smtp_message_code() to check and possibly modify the response code, and then
519calls smtp_respond() to transmit the response. I put this into a function
520just to avoid a lot of repetition.
61147df4
PP
521
522Arguments:
fd98a5c6
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523 code the response code
524 user_msg the user message
525
526Returns: nothing
61147df4
PP
527*/
528
8ccd00b1 529#ifndef DISABLE_PRDR
61147df4 530static void
fd98a5c6 531smtp_user_msg(uschar *code, uschar *user_msg)
61147df4 532{
fd98a5c6 533int len = 3;
4f6ae5c3 534smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
fd98a5c6 535smtp_respond(code, len, TRUE, user_msg);
61147df4
PP
536}
537#endif
538
539
540
541
fd98a5c6
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542
543/*************************************************
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544* Remove a recipient from the list *
545*************************************************/
546
547/* This function is provided for local_scan() to use.
548
549Argument:
550 recipient address to remove
551
552Returns: TRUE if it did remove something; FALSE otherwise
553*/
554
555BOOL
556receive_remove_recipient(uschar *recipient)
557{
558int count;
559DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
560 recipient);
561for (count = 0; count < recipients_count; count++)
562 {
563 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
564 {
565 if ((--recipients_count - count) > 0)
566 memmove(recipients_list + count, recipients_list + count + 1,
54cdb463 567 (recipients_count - count)*sizeof(recipient_item));
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568 return TRUE;
569 }
570 }
571return FALSE;
572}
573
574
575
576
577
578/*************************************************
579* Read data portion of a non-SMTP message *
580*************************************************/
581
582/* This function is called to read the remainder of a message (following the
583header) when the input is not from SMTP - we are receiving a local message on
584a standard input stream. The message is always terminated by EOF, and is also
585terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
586two cases for maximum efficiency.
587
588Ensure that the body ends with a newline. This will naturally be the case when
589the termination is "\n.\n" but may not be otherwise. The RFC defines messages
590as "sequences of lines" - this of course strictly applies only to SMTP, but
591deliveries into BSD-type mailbox files also require it. Exim used to have a
592flag for doing this at delivery time, but as it was always set for all
593transports, I decided to simplify things by putting the check here instead.
594
595There is at least one MUA (dtmail) that sends CRLF via this interface, and
596other programs are known to do this as well. Exim used to have a option for
597dealing with this: in July 2003, after much discussion, the code has been
598changed to default to treat any of LF, CRLF, and bare CR as line terminators.
599
600However, for the case when a dot on a line by itself terminates a message, the
601only recognized terminating sequences before and after the dot are LF and CRLF.
602Otherwise, having read EOL . CR, you don't know whether to read another
603character or not.
604
605Internally, in messages stored in Exim's spool files, LF is used as the line
606terminator. Under the new regime, bare CRs will no longer appear in these
607files.
608
609Arguments:
610 fout a FILE to which to write the message
611
612Returns: One of the END_xxx values indicating why it stopped reading
613*/
614
615static int
616read_message_data(FILE *fout)
617{
618int ch_state;
619register int ch;
d677b2f2 620register int linelength = 0;
059ec3d9
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621
622/* Handle the case when only EOF terminates the message */
623
624if (!dot_ends)
625 {
626 register int last_ch = '\n';
627
bd8fbe36 628 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
059ec3d9
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629 {
630 if (ch == 0) body_zerocount++;
631 if (last_ch == '\r' && ch != '\n')
632 {
d677b2f2
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633 if (linelength > max_received_linelength)
634 max_received_linelength = linelength;
635 linelength = 0;
059ec3d9
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636 if (fputc('\n', fout) == EOF) return END_WERROR;
637 message_size++;
638 body_linecount++;
639 }
640 if (ch == '\r') continue;
641
642 if (fputc(ch, fout) == EOF) return END_WERROR;
d677b2f2
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643 if (ch == '\n')
644 {
645 if (linelength > max_received_linelength)
646 max_received_linelength = linelength;
647 linelength = 0;
648 body_linecount++;
649 }
650 else linelength++;
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651 if (++message_size > thismessage_size_limit) return END_SIZE;
652 }
653
654 if (last_ch != '\n')
655 {
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656 if (linelength > max_received_linelength)
657 max_received_linelength = linelength;
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658 if (fputc('\n', fout) == EOF) return END_WERROR;
659 message_size++;
660 body_linecount++;
661 }
662
663 return END_EOF;
664 }
665
666/* Handle the case when a dot on a line on its own, or EOF, terminates. */
667
668ch_state = 1;
669
bd8fbe36 670while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
059ec3d9
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671 {
672 if (ch == 0) body_zerocount++;
673 switch (ch_state)
674 {
675 case 0: /* Normal state (previous char written) */
676 if (ch == '\n')
d677b2f2
PH
677 {
678 body_linecount++;
679 if (linelength > max_received_linelength)
680 max_received_linelength = linelength;
681 linelength = -1;
682 ch_state = 1;
683 }
059ec3d9
PH
684 else if (ch == '\r')
685 { ch_state = 2; continue; }
686 break;
687
688 case 1: /* After written "\n" */
689 if (ch == '.') { ch_state = 3; continue; }
6eb02f88 690 if (ch == '\r') { ch_state = 2; continue; }
3581f321
JH
691 if (ch == '\n') { body_linecount++; linelength = -1; }
692 else ch_state = 0;
059ec3d9
PH
693 break;
694
695 case 2:
696 body_linecount++; /* After unwritten "\r" */
d677b2f2
PH
697 if (linelength > max_received_linelength)
698 max_received_linelength = linelength;
059ec3d9 699 if (ch == '\n')
d677b2f2
PH
700 {
701 ch_state = 1;
702 linelength = -1;
703 }
059ec3d9
PH
704 else
705 {
706 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
707 if (ch == '\r') continue;
708 ch_state = 0;
d677b2f2 709 linelength = 0;
059ec3d9
PH
710 }
711 break;
712
713 case 3: /* After "\n." (\n written, dot not) */
714 if (ch == '\n') return END_DOT;
715 if (ch == '\r') { ch_state = 4; continue; }
716 message_size++;
d677b2f2 717 linelength++;
059ec3d9
PH
718 if (fputc('.', fout) == EOF) return END_WERROR;
719 ch_state = 0;
720 break;
721
722 case 4: /* After "\n.\r" (\n written, rest not) */
723 if (ch == '\n') return END_DOT;
724 message_size += 2;
725 body_linecount++;
726 if (fputs(".\n", fout) == EOF) return END_WERROR;
727 if (ch == '\r') { ch_state = 2; continue; }
728 ch_state = 0;
729 break;
730 }
731
d677b2f2 732 linelength++;
059ec3d9
PH
733 if (fputc(ch, fout) == EOF) return END_WERROR;
734 if (++message_size > thismessage_size_limit) return END_SIZE;
735 }
736
737/* Get here if EOF read. Unless we have just written "\n", we need to ensure
738the message ends with a newline, and we must also write any characters that
739were saved up while testing for an ending dot. */
740
741if (ch_state != 1)
742 {
743 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
744 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
745 message_size += Ustrlen(ends[ch_state]);
746 body_linecount++;
747 }
748
749return END_EOF;
750}
751
752
753
754
755/*************************************************
756* Read data portion of an SMTP message *
757*************************************************/
758
759/* This function is called to read the remainder of an SMTP message (after the
760headers), or to skip over it when an error has occurred. In this case, the
761output file is passed as NULL.
762
763If any line begins with a dot, that character is skipped. The input should only
764be successfully terminated by CR LF . CR LF unless it is local (non-network)
765SMTP, in which case the CRs are optional, but...
766
767FUDGE: It seems that sites on the net send out messages with just LF
768terminators, despite the warnings in the RFCs, and other MTAs handle this. So
769we make the CRs optional in all cases.
770
771July 2003: Bare CRs cause trouble. We now treat them as line terminators as
772well, so that there are no CRs in spooled messages. However, the message
773terminating dot is not recognized between two bare CRs.
774
775Arguments:
776 fout a FILE to which to write the message; NULL if skipping
777
778Returns: One of the END_xxx values indicating why it stopped reading
779*/
780
781static int
782read_message_data_smtp(FILE *fout)
783{
784int ch_state = 0;
e4bdf652 785int ch;
7e3ce68e 786int linelength = 0;
059ec3d9 787
bd8fbe36 788while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
059ec3d9
PH
789 {
790 if (ch == 0) body_zerocount++;
791 switch (ch_state)
792 {
793 case 0: /* After LF or CRLF */
794 if (ch == '.')
795 {
796 ch_state = 3;
797 continue; /* Don't ever write . after LF */
798 }
799 ch_state = 1;
800
801 /* Else fall through to handle as normal uschar. */
802
803 case 1: /* Normal state */
804 if (ch == '\n')
805 {
806 ch_state = 0;
807 body_linecount++;
1f5497b2
PH
808 if (linelength > max_received_linelength)
809 max_received_linelength = linelength;
810 linelength = -1;
059ec3d9
PH
811 }
812 else if (ch == '\r')
813 {
814 ch_state = 2;
815 continue;
816 }
817 break;
818
819 case 2: /* After (unwritten) CR */
820 body_linecount++;
1f5497b2
PH
821 if (linelength > max_received_linelength)
822 max_received_linelength = linelength;
823 linelength = -1;
059ec3d9
PH
824 if (ch == '\n')
825 {
826 ch_state = 0;
827 }
828 else
829 {
830 message_size++;
831 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
6851a9c5 832 cutthrough_data_put_nl();
059ec3d9
PH
833 if (ch != '\r') ch_state = 1; else continue;
834 }
835 break;
836
837 case 3: /* After [CR] LF . */
838 if (ch == '\n')
839 return END_DOT;
840 if (ch == '\r')
841 {
842 ch_state = 4;
843 continue;
844 }
1bc460a6
JH
845 /* The dot was removed at state 3. For a doubled dot, here, reinstate
846 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
847 and to file below. */
848 if (ch == '.')
849 {
850 uschar c= ch;
6851a9c5 851 cutthrough_data_puts(&c, 1);
1bc460a6
JH
852 }
853 ch_state = 1;
059ec3d9
PH
854 break;
855
856 case 4: /* After [CR] LF . CR */
857 if (ch == '\n') return END_DOT;
858 message_size++;
859 body_linecount++;
860 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
6851a9c5 861 cutthrough_data_put_nl();
059ec3d9
PH
862 if (ch == '\r')
863 {
864 ch_state = 2;
865 continue;
866 }
867 ch_state = 1;
868 break;
869 }
870
871 /* Add the character to the spool file, unless skipping; then loop for the
872 next. */
873
874 message_size++;
1f5497b2 875 linelength++;
7e3ce68e 876 if (fout)
059ec3d9
PH
877 {
878 if (fputc(ch, fout) == EOF) return END_WERROR;
879 if (message_size > thismessage_size_limit) return END_SIZE;
880 }
e4bdf652 881 if(ch == '\n')
6851a9c5 882 cutthrough_data_put_nl();
e4bdf652
JH
883 else
884 {
7e3ce68e 885 uschar c = ch;
6851a9c5 886 cutthrough_data_puts(&c, 1);
e4bdf652 887 }
059ec3d9
PH
888 }
889
890/* Fall through here if EOF encountered. This indicates some kind of error,
891since a correct message is terminated by [CR] LF . [CR] LF. */
892
893return END_EOF;
894}
895
896
897
898
7e3ce68e 899/* Variant of the above read_message_data_smtp() specialised for RFC 3030
1ebe15c3
JH
900CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
901LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
902body_linecount accounting for proper re-expansion for the wire, so use
903a cut-down version of the state-machine above; we don't need to do leading-dot
904detection and unstuffing.
7e3ce68e
JH
905
906Arguments:
544dd905
PP
907 fout a FILE to which to write the message; NULL if skipping;
908 must be open for both writing and reading.
7e3ce68e
JH
909
910Returns: One of the END_xxx values indicating why it stopped reading
911*/
912
913static int
914read_message_bdat_smtp(FILE *fout)
915{
cff70eb1
HSHR
916int linelength = 0, ch;
917enum CH_STATE ch_state = LF_SEEN;
d953610f 918BOOL fix_nl = FALSE;
7e3ce68e 919
1ebe15c3 920for(;;)
7e3ce68e 921 {
7d758a6a 922 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
1ebe15c3
JH
923 {
924 case EOF: return END_EOF;
1ebe15c3 925 case ERR: return END_PROTOCOL;
d953610f
HSHR
926 case EOD:
927 /* Nothing to get from the sender anymore. We check the last
928 character written to the spool.
929
930 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
931 If we would be strict, we would refuse such broken messages.
932 But we are liberal, so we fix it. It would be easy just to append
933 the "\n" to the spool.
934
935 But there are some more things (line counting, message size calculation and such),
936 that would need to be duplicated here. So we simply do some ungetc
937 trickery.
938 */
59d98039
JH
939 if (fout)
940 {
941 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
942 if (fgetc(fout) == '\n') return END_DOT;
943 }
d953610f
HSHR
944
945 if (linelength == -1) /* \r already seen (see below) */
946 {
947 DEBUG(D_receive) debug_printf("Add missing LF\n");
948 bdat_ungetc('\n');
949 continue;
950 }
951 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
952 bdat_ungetc('\r'); /* not even \r was seen */
953 fix_nl = TRUE;
954
955 continue;
1ebe15c3
JH
956 case '\0': body_zerocount++; break;
957 }
958 switch (ch_state)
959 {
cff70eb1
HSHR
960 case LF_SEEN: /* After LF or CRLF */
961 ch_state = MID_LINE;
1ebe15c3 962 /* fall through to handle as normal uschar. */
7e3ce68e 963
cff70eb1 964 case MID_LINE: /* Mid-line state */
1ebe15c3
JH
965 if (ch == '\n')
966 {
cff70eb1 967 ch_state = LF_SEEN;
1ebe15c3
JH
968 body_linecount++;
969 if (linelength > max_received_linelength)
970 max_received_linelength = linelength;
971 linelength = -1;
972 }
973 else if (ch == '\r')
974 {
cff70eb1 975 ch_state = CR_SEEN;
d953610f 976 if (fix_nl) bdat_ungetc('\n');
1ebe15c3
JH
977 continue; /* don't write CR */
978 }
979 break;
7e3ce68e 980
cff70eb1 981 case CR_SEEN: /* After (unwritten) CR */
1ebe15c3
JH
982 body_linecount++;
983 if (linelength > max_received_linelength)
984 max_received_linelength = linelength;
985 linelength = -1;
986 if (ch == '\n')
cff70eb1 987 ch_state = LF_SEEN;
1ebe15c3
JH
988 else
989 {
990 message_size++;
59d98039 991 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
6851a9c5 992 cutthrough_data_put_nl();
1ebe15c3 993 if (ch == '\r') continue; /* don't write CR */
cff70eb1 994 ch_state = MID_LINE;
1ebe15c3
JH
995 }
996 break;
997 }
998
999 /* Add the character to the spool file, unless skipping */
1000
1001 message_size++;
1002 linelength++;
1003 if (fout)
1004 {
1005 if (fputc(ch, fout) == EOF) return END_WERROR;
1006 if (message_size > thismessage_size_limit) return END_SIZE;
1007 }
1008 if(ch == '\n')
6851a9c5 1009 cutthrough_data_put_nl();
1ebe15c3
JH
1010 else
1011 {
1012 uschar c = ch;
6851a9c5 1013 cutthrough_data_puts(&c, 1);
1ebe15c3 1014 }
7e3ce68e
JH
1015 }
1016/*NOTREACHED*/
1017}
1018
328c5688
JH
1019static int
1020read_message_bdat_smtp_wire(FILE *fout)
1021{
1022int ch;
1023
1024/* Remember that this message uses wireformat. */
1025
d21bf202
JH
1026DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1027 fout ? "writing spoolfile in wire format" : "flushing input");
328c5688
JH
1028spool_file_wireformat = TRUE;
1029
0d81dabc 1030for (;;)
328c5688 1031 {
0d81dabc
JH
1032 if (chunking_data_left > 0)
1033 {
1034 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1035 uschar * buf = bdat_getbuf(&len);
328c5688 1036
0d81dabc
JH
1037 message_size += len;
1038 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1039 }
1040 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1041 {
1042 case EOF: return END_EOF;
1043 case EOD: return END_DOT;
1044 case ERR: return END_PROTOCOL;
1045
1046 default:
1047 message_size++;
1048 /*XXX not done:
1049 linelength
1050 max_received_linelength
1051 body_linecount
1052 body_zerocount
1053 */
1054 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1055 break;
1056 }
1057 if (message_size > thismessage_size_limit) return END_SIZE;
328c5688
JH
1058 }
1059/*NOTREACHED*/
1060}
1061
7e3ce68e
JH
1062
1063
1064
059ec3d9
PH
1065/*************************************************
1066* Swallow SMTP message *
1067*************************************************/
1068
1069/* This function is called when there has been some kind of error while reading
1070an SMTP message, and the remaining data may need to be swallowed. It is global
1071because it is called from smtp_closedown() to shut down an incoming call
1072tidily.
1073
1074Argument: a FILE from which to read the message
1075Returns: nothing
1076*/
1077
1078void
1079receive_swallow_smtp(void)
1080{
1081if (message_ended >= END_NOTENDED)
d21bf202
JH
1082 message_ended = chunking_state <= CHUNKING_OFFERED
1083 ? read_message_data_smtp(NULL)
1084 : read_message_bdat_smtp_wire(NULL);
059ec3d9
PH
1085}
1086
1087
1088
1089/*************************************************
1090* Handle lost SMTP connection *
1091*************************************************/
1092
1093/* This function logs connection loss incidents and generates an appropriate
1094SMTP response.
1095
1096Argument: additional data for the message
1097Returns: the SMTP response
1098*/
1099
1100static uschar *
1101handle_lost_connection(uschar *s)
1102{
1103log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1104 "%s lost while reading message data%s", smtp_get_connection_info(), s);
eea0defe 1105smtp_notquit_exit(US"connection-lost", NULL, NULL);
059ec3d9
PH
1106return US"421 Lost incoming connection";
1107}
1108
1109
1110
1111
1112/*************************************************
1113* Handle a non-smtp reception error *
1114*************************************************/
1115
1116/* This function is called for various errors during the reception of non-SMTP
1117messages. It either sends a message to the sender of the problem message, or it
1118writes to the standard error stream.
1119
1120Arguments:
1121 errcode code for moan_to_sender(), identifying the error
1122 text1 first message text, passed to moan_to_sender()
1123 text2 second message text, used only for stderrr
1124 error_rc code to pass to exim_exit if no problem
1125 f FILE containing body of message (may be stdin)
1126 hptr pointer to instore headers or NULL
1127
1128Returns: calls exim_exit(), which does not return
1129*/
1130
1131static void
1132give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1133 FILE *f, header_line *hptr)
1134{
1135if (error_handling == ERRORS_SENDER)
1136 {
1137 error_block eblock;
1138 eblock.next = NULL;
1139 eblock.text1 = text1;
37f3dc43 1140 eblock.text2 = US"";
059ec3d9
PH
1141 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1142 error_rc = EXIT_FAILURE;
1143 }
37f3dc43
JH
1144else
1145 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
f1e894f3 1146(void)fclose(f);
9bfb7e1b 1147exim_exit(error_rc, US"");
059ec3d9
PH
1148}
1149
1150
1151
1152/*************************************************
1153* Add header lines set up by ACL *
1154*************************************************/
1155
850635b6
PH
1156/* This function is called to add the header lines that were set up by
1157statements in an ACL to the list of headers in memory. It is done in two stages
1158like this, because when the ACL for RCPT is running, the other headers have not
1159yet been received. This function is called twice; once just before running the
1160DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1161are visible to the DATA ACL.
059ec3d9
PH
1162
1163Originally these header lines were added at the end. Now there is support for
1164three different places: top, bottom, and after the Received: header(s). There
1165will always be at least one Received: header, even if it is marked deleted, and
1166even if something else has been put in front of it.
1167
1168Arguments:
1169 acl_name text to identify which ACL
1170
1171Returns: nothing
1172*/
1173
1174static void
578d43dc 1175add_acl_headers(int where, uschar *acl_name)
059ec3d9
PH
1176{
1177header_line *h, *next;
1178header_line *last_received = NULL;
e7568d51 1179
578d43dc
JH
1180switch(where)
1181 {
1182 case ACL_WHERE_DKIM:
1183 case ACL_WHERE_MIME:
af4a1bca 1184 case ACL_WHERE_DATA:
57cc2785
JH
1185 if ( cutthrough.fd >= 0 && cutthrough.delivery
1186 && (acl_removed_headers || acl_added_headers))
578d43dc
JH
1187 {
1188 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
af4a1bca 1189 " will not take effect on cutthrough deliveries");
578d43dc
JH
1190 return;
1191 }
1192 }
1193
57cc2785 1194if (acl_removed_headers)
e7568d51 1195 {
e1d04f48 1196 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
e7568d51 1197
57cc2785 1198 for (h = header_list; h; h = h->next) if (h->type != htype_old)
e7568d51 1199 {
55414b25 1200 const uschar * list = acl_removed_headers;
e7568d51
TL
1201 int sep = ':'; /* This is specified as a colon-separated list */
1202 uschar *s;
1203 uschar buffer[128];
4a142059
JH
1204
1205 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1206 if (header_testname(h, s, Ustrlen(s), FALSE))
e7568d51
TL
1207 {
1208 h->type = htype_old;
e1d04f48 1209 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
e7568d51 1210 }
e7568d51
TL
1211 }
1212 acl_removed_headers = NULL;
e1d04f48 1213 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
e7568d51 1214 }
059ec3d9 1215
57cc2785 1216if (!acl_added_headers) return;
e1d04f48 1217DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
059ec3d9 1218
57cc2785 1219for (h = acl_added_headers; h; h = next)
059ec3d9
PH
1220 {
1221 next = h->next;
1222
1223 switch(h->type)
1224 {
1225 case htype_add_top:
1226 h->next = header_list;
1227 header_list = h;
e1d04f48 1228 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
059ec3d9
PH
1229 break;
1230
1231 case htype_add_rec:
1232 if (last_received == NULL)
1233 {
1234 last_received = header_list;
1235 while (!header_testname(last_received, US"Received", 8, FALSE))
1236 last_received = last_received->next;
1237 while (last_received->next != NULL &&
1238 header_testname(last_received->next, US"Received", 8, FALSE))
1239 last_received = last_received->next;
1240 }
1241 h->next = last_received->next;
1242 last_received->next = h;
e1d04f48 1243 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
059ec3d9
PH
1244 break;
1245
8523533c
TK
1246 case htype_add_rfc:
1247 /* add header before any header which is NOT Received: or Resent- */
1248 last_received = header_list;
1249 while ( (last_received->next != NULL) &&
1250 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1251 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1252 last_received = last_received->next;
1253 /* last_received now points to the last Received: or Resent-* header
1254 in an uninterrupted chain of those header types (seen from the beginning
1255 of all headers. Our current header must follow it. */
1256 h->next = last_received->next;
1257 last_received->next = h;
e1d04f48 1258 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
8523533c
TK
1259 break;
1260
059ec3d9
PH
1261 default:
1262 h->next = NULL;
1263 header_last->next = h;
1264 break;
1265 }
1266
1267 if (h->next == NULL) header_last = h;
1268
1269 /* Check for one of the known header types (From:, To:, etc.) though in
1270 practice most added headers are going to be "other". Lower case
1271 identification letters are never stored with the header; they are used
1272 for existence tests when messages are received. So discard any lower case
1273 flag values. */
1274
1275 h->type = header_checkname(h, FALSE);
1276 if (h->type >= 'a') h->type = htype_other;
1277
e1d04f48 1278 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", header_last->text);
059ec3d9
PH
1279 }
1280
71fafd95 1281acl_added_headers = NULL;
e1d04f48 1282DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
059ec3d9
PH
1283}
1284
1285
1286
1287/*************************************************
1288* Add host information for log line *
1289*************************************************/
1290
1291/* Called for acceptance and rejecting log lines. This adds information about
1292the calling host to a string that is being built dynamically.
1293
1294Arguments:
1295 s the dynamic string
059ec3d9
PH
1296
1297Returns: the extended string
1298*/
1299
acec9514
JH
1300static gstring *
1301add_host_info_for_log(gstring * g)
059ec3d9 1302{
fc16abb4 1303if (sender_fullhost)
059ec3d9 1304 {
fc16abb4 1305 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
acec9514
JH
1306 g = string_catn(g, US" DS", 3);
1307 g = string_append(g, 2, US" H=", sender_fullhost);
6c6d6e48 1308 if (LOGGING(incoming_interface) && interface_address != NULL)
059ec3d9 1309 {
acec9514 1310 g = string_cat(g,
fc16abb4 1311 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
059ec3d9
PH
1312 }
1313 }
a2673768
JH
1314if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1315 {
acec9514 1316 g = string_catn(g, US" TFO", 4);
a2673768
JH
1317 tcp_in_fastopen_logged = TRUE;
1318 }
1319if (sender_ident)
acec9514 1320 g = string_append(g, 2, US" U=", sender_ident);
a2673768 1321if (received_protocol)
acec9514
JH
1322 g = string_append(g, 2, US" P=", received_protocol);
1323return g;
059ec3d9
PH
1324}
1325
1326
1327
63955bf2 1328#ifdef WITH_CONTENT_SCAN
059ec3d9
PH
1329
1330/*************************************************
54cdb463
PH
1331* Run the MIME ACL on a message *
1332*************************************************/
1333
1334/* This code is in a subroutine so that it can be used for both SMTP
1335and non-SMTP messages. It is called with a non-NULL ACL pointer.
1336
1337Arguments:
1338 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1339 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1340 smtp_reply_ptr Where SMTP reply is being built
1341 blackholed_by_ptr Where "blackholed by" message is being built
1342
1343Returns: TRUE to carry on; FALSE to abandon the message
1344*/
1345
1346static BOOL
1347run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1348 uschar **blackholed_by_ptr)
1349{
1350FILE *mbox_file;
5b6f7658 1351uschar * rfc822_file_path = NULL;
54cdb463
PH
1352unsigned long mbox_size;
1353header_line *my_headerlist;
1354uschar *user_msg, *log_msg;
1355int mime_part_count_buffer = -1;
040721f2 1356uschar * mbox_filename;
7156b1ef 1357int rc = OK;
54cdb463 1358
54cdb463 1359/* check if it is a MIME message */
040721f2
JH
1360
1361for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1362 if ( my_headerlist->type != '*' /* skip deleted headers */
1363 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1364 )
4e88a19f 1365 {
54cdb463
PH
1366 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1367 goto DO_MIME_ACL;
4e88a19f 1368 }
54cdb463
PH
1369
1370DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1371return TRUE;
1372
1373DO_MIME_ACL:
040721f2 1374
54cdb463 1375/* make sure the eml mbox file is spooled up */
040721f2
JH
1376if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1377 { /* error while spooling */
54cdb463
PH
1378 log_write(0, LOG_MAIN|LOG_PANIC,
1379 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1380 Uunlink(spool_name);
1381 unspool_mbox();
6f0c431a
PP
1382#ifdef EXPERIMENTAL_DCC
1383 dcc_ok = 0;
1384#endif
a5bd321b 1385 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
54cdb463
PH
1386 message_id[0] = 0; /* Indicate no message accepted */
1387 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1388 return FALSE; /* Indicate skip to end of receive function */
040721f2 1389 }
54cdb463
PH
1390
1391mime_is_rfc822 = 0;
1392
1393MIME_ACL_CHECK:
1394mime_part_count = -1;
1395rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
f1e894f3 1396(void)fclose(mbox_file);
54cdb463 1397
5b6f7658 1398if (rfc822_file_path)
4e88a19f 1399 {
54cdb463
PH
1400 mime_part_count = mime_part_count_buffer;
1401
4e88a19f
PH
1402 if (unlink(CS rfc822_file_path) == -1)
1403 {
54cdb463
PH
1404 log_write(0, LOG_PANIC,
1405 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
5b6f7658 1406 goto END_MIME_ACL;
4e88a19f 1407 }
5b6f7658 1408 rfc822_file_path = NULL;
4e88a19f 1409 }
54cdb463
PH
1410
1411/* check if we must check any message/rfc822 attachments */
4e88a19f
PH
1412if (rc == OK)
1413 {
5b6f7658
JH
1414 uschar * scandir = string_copyn(mbox_filename,
1415 Ustrrchr(mbox_filename, '/') - mbox_filename);
e8bc7fca
JH
1416 struct dirent * entry;
1417 DIR * tempdir;
54cdb463 1418
5b6f7658 1419 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
e8bc7fca 1420 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
4e88a19f 1421 {
5b6f7658
JH
1422 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1423 DEBUG(D_receive)
1424 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1425 rfc822_file_path);
4e88a19f
PH
1426 break;
1427 }
4e88a19f 1428 closedir(tempdir);
54cdb463 1429
5b6f7658 1430 if (rfc822_file_path)
4e88a19f 1431 {
e8bc7fca 1432 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
4e88a19f 1433 {
e8bc7fca
JH
1434 /* set RFC822 expansion variable */
1435 mime_is_rfc822 = 1;
1436 mime_part_count_buffer = mime_part_count;
1437 goto MIME_ACL_CHECK;
4e88a19f 1438 }
e8bc7fca
JH
1439 log_write(0, LOG_PANIC,
1440 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1441 unlink(CS rfc822_file_path);
4e88a19f
PH
1442 }
1443 }
54cdb463
PH
1444
1445END_MIME_ACL:
578d43dc 1446add_acl_headers(ACL_WHERE_MIME, US"MIME");
54cdb463
PH
1447if (rc == DISCARD)
1448 {
1449 recipients_count = 0;
1450 *blackholed_by_ptr = US"MIME ACL";
1451 }
1452else if (rc != OK)
1453 {
1454 Uunlink(spool_name);
1455 unspool_mbox();
6f0c431a
PP
1456#ifdef EXPERIMENTAL_DCC
1457 dcc_ok = 0;
1458#endif
5b6f7658 1459 if (smtp_input)
4f6ae5c3 1460 {
5b6f7658
JH
1461 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1462 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
f4c1088b 1463 *smtp_reply_ptr = US""; /* Indicate reply already sent */
4f6ae5c3 1464 }
54cdb463
PH
1465 message_id[0] = 0; /* Indicate no message accepted */
1466 return FALSE; /* Cause skip to end of receive function */
4e88a19f 1467 }
54cdb463
PH
1468
1469return TRUE;
1470}
1471
63955bf2 1472#endif /* WITH_CONTENT_SCAN */
54cdb463
PH
1473
1474
e4bdf652
JH
1475
1476void
1477received_header_gen(void)
1478{
1479uschar *received;
1480uschar *timestamp;
1481header_line *received_header= header_list;
1482
1483timestamp = expand_string(US"${tod_full}");
1484if (recipients_count == 1) received_for = recipients_list[0].address;
1485received = expand_string(received_header_text);
1486received_for = NULL;
1487
d4ff61d1 1488if (!received)
e4bdf652
JH
1489 {
1490 if(spool_name[0] != 0)
1491 Uunlink(spool_name); /* Lose the data file */
1492 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1493 "(received_header_text) failed: %s", string_printing(received_header_text),
1494 expand_string_message);
1495 }
1496
1497/* The first element on the header chain is reserved for the Received header,
1498so all we have to do is fill in the text pointer, and set the type. However, if
1499the result of the expansion is an empty string, we leave the header marked as
1500"old" so as to refrain from adding a Received header. */
1501
1502if (received[0] == 0)
1503 {
1504 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1505 received_header->type = htype_old;
1506 }
1507else
1508 {
1509 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1510 received_header->type = htype_received;
1511 }
1512
1513received_header->slen = Ustrlen(received_header->text);
1514
1515DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1516 received_header->type, received_header->text);
1517}
1518
1519
1520
54cdb463 1521/*************************************************
059ec3d9
PH
1522* Receive message *
1523*************************************************/
1524
1525/* Receive a message on the given input, and put it into a pair of spool files.
1526Either a non-null list of recipients, or the extract flag will be true, or
1527both. The flag sender_local is true for locally generated messages. The flag
1528submission_mode is true if an ACL has obeyed "control = submission". The flag
8800895a 1529suppress_local_fixups is true if an ACL has obeyed "control =
f4ee74ac
PP
1530suppress_local_fixups" or -G was passed on the command-line.
1531The flag smtp_input is true if the message is to be
8800895a
PH
1532handled using SMTP conventions about termination and lines starting with dots.
1533For non-SMTP messages, dot_ends is true for dot-terminated messages.
059ec3d9
PH
1534
1535If a message was successfully read, message_id[0] will be non-zero.
1536
1537The general actions of this function are:
1538
1539 . Read the headers of the message (if any) into a chain of store
1540 blocks.
1541
1542 . If there is a "sender:" header and the message is locally originated,
69358f02
PH
1543 throw it away, unless the caller is trusted, or unless
1544 active_local_sender_retain is set - which can only happen if
1545 active_local_from_check is false.
059ec3d9
PH
1546
1547 . If recipients are to be extracted from the message, build the
1548 recipients list from the headers, removing any that were on the
1549 original recipients list (unless extract_addresses_remove_arguments is
1550 false), and at the same time, remove any bcc header that may be present.
1551
1552 . Get the spool file for the data, sort out its unique name, open
1553 and lock it (but don't give it the name yet).
1554
1555 . Generate a "Message-Id" header if the message doesn't have one, for
1556 locally-originated messages.
1557
1558 . Generate a "Received" header.
1559
1560 . Ensure the recipients list is fully qualified and rewritten if necessary.
1561
1562 . If there are any rewriting rules, apply them to the sender address
1563 and also to the headers.
1564
1565 . If there is no from: header, generate one, for locally-generated messages
1566 and messages in "submission mode" only.
1567
1568 . If the sender is local, check that from: is correct, and if not, generate
1569 a Sender: header, unless message comes from a trusted caller, or this
69358f02 1570 feature is disabled by active_local_from_check being false.
059ec3d9
PH
1571
1572 . If there is no "date" header, generate one, for locally-originated
1573 or submission mode messages only.
1574
1575 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1576 dot_ends mode, to the data file. Leave it open, to hold the lock.
1577
1578 . Write the envelope and the headers to a new file.
1579
1580 . Set the name for the header file; close it.
1581
1582 . Set the name for the data file; close it.
1583
1584Because this function can potentially be called many times in a single
1585SMTP connection, all store should be got by store_get(), so that it will be
1586automatically retrieved after the message is accepted.
1587
1588FUDGE: It seems that sites on the net send out messages with just LF
1589terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1590we make the CRs optional in all cases.
1591
1592July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1593new regime is now in place in which bare CRs in header lines are turned into LF
1594followed by a space, so as not to terminate the header line.
1595
1596February 2004: A bare LF in a header line in a message whose first line was
1597terminated by CRLF is treated in the same way as a bare CR.
1598
1599Arguments:
1600 extract_recip TRUE if recipients are to be extracted from the message's
1601 headers
1602
1603Returns: TRUE there are more messages to be read (SMTP input)
1604 FALSE there are no more messages to be read (non-SMTP input
1605 or SMTP connection collapsed, or other failure)
1606
1607When reading a message for filter testing, the returned value indicates
1608whether the headers (which is all that is read) were terminated by '.' or
1609not. */
1610
1611BOOL
1612receive_msg(BOOL extract_recip)
1613{
7156b1ef
NM
1614int i;
1615int rc = FAIL;
059ec3d9
PH
1616int msg_size = 0;
1617int process_info_len = Ustrlen(process_info);
1618int error_rc = (error_handling == ERRORS_SENDER)?
1619 errors_sender_rc : EXIT_FAILURE;
1620int header_size = 256;
acec9514 1621int start, end, domain;
059ec3d9
PH
1622int id_resolution;
1623int had_zero = 0;
d677b2f2 1624int prevlines_length = 0;
059ec3d9
PH
1625
1626register int ptr = 0;
1627
1628BOOL contains_resent_headers = FALSE;
1629BOOL extracted_ignored = FALSE;
1630BOOL first_line_ended_crlf = TRUE_UNSET;
1631BOOL smtp_yield = TRUE;
1632BOOL yield = FALSE;
1633
1634BOOL resents_exist = FALSE;
1635uschar *resent_prefix = US"";
1636uschar *blackholed_by = NULL;
04f7d5b9 1637uschar *blackhole_log_msg = US"";
c5430c20 1638enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
059ec3d9
PH
1639
1640flock_t lock_data;
1641error_block *bad_addresses = NULL;
1642
1643uschar *frozen_by = NULL;
1644uschar *queued_by = NULL;
1645
acec9514
JH
1646uschar *errmsg;
1647gstring * g;
059ec3d9
PH
1648struct stat statbuf;
1649
4e88a19f 1650/* Final message to give to SMTP caller, and messages from ACLs */
059ec3d9
PH
1651
1652uschar *smtp_reply = NULL;
4e88a19f 1653uschar *user_msg, *log_msg;
059ec3d9
PH
1654
1655/* Working header pointers */
1656
1657header_line *h, *next;
1658
2cbb4081 1659/* Flags for noting the existence of certain headers (only one left) */
059ec3d9
PH
1660
1661BOOL date_header_exists = FALSE;
1662
1663/* Pointers to receive the addresses of headers whose contents we need. */
1664
1665header_line *from_header = NULL;
1666header_line *subject_header = NULL;
1667header_line *msgid_header = NULL;
1668header_line *received_header;
1669
4840604e
TL
1670#ifdef EXPERIMENTAL_DMARC
1671int dmarc_up = 0;
1672#endif /* EXPERIMENTAL_DMARC */
1673
059ec3d9
PH
1674/* Variables for use when building the Received: header. */
1675
059ec3d9
PH
1676uschar *timestamp;
1677int tslen;
1678
1679/* Release any open files that might have been cached while preparing to
1680accept the message - e.g. by verifying addresses - because reading a message
1681might take a fair bit of real time. */
1682
1683search_tidyup();
1684
e4bdf652
JH
1685/* Extracting the recipient list from an input file is incompatible with
1686cutthrough delivery with the no-spool option. It shouldn't be possible
817d9f57 1687to set up the combination, but just in case kill any ongoing connection. */
e4bdf652 1688if (extract_recip || !smtp_input)
57cc2785 1689 cancel_cutthrough_connection(TRUE, US"not smtp input");
e4bdf652 1690
059ec3d9
PH
1691/* Initialize the chain of headers by setting up a place-holder for Received:
1692header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1693pointing to the end of the chain to make adding headers simple. */
1694
1695received_header = header_list = header_last = store_get(sizeof(header_line));
1696header_list->next = NULL;
1697header_list->type = htype_old;
1698header_list->text = NULL;
1699header_list->slen = 0;
1700
1701/* Control block for the next header to be read. */
1702
1703next = store_get(sizeof(header_line));
1704next->text = store_get(header_size);
1705
1706/* Initialize message id to be null (indicating no message read), and the
1707header names list to be the normal list. Indicate there is no data file open
1708yet, initialize the size and warning count, and deal with no size limit. */
1709
1710message_id[0] = 0;
1711data_file = NULL;
1712data_fd = -1;
41313d92 1713spool_name = US"";
059ec3d9
PH
1714message_size = 0;
1715warning_count = 0;
d677b2f2 1716received_count = 1; /* For the one we will add */
059ec3d9
PH
1717
1718if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1719
2e0c1448 1720/* While reading the message, the following counts are computed. */
059ec3d9 1721
d677b2f2
PH
1722message_linecount = body_linecount = body_zerocount =
1723 max_received_linelength = 0;
059ec3d9 1724
80a47a2c 1725#ifndef DISABLE_DKIM
e983e85a
JH
1726/* Call into DKIM to set up the context. In CHUNKING mode
1727we clear the dot-stuffing flag */
1728if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1729 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
fb2274d4
TK
1730#endif
1731
4840604e
TL
1732#ifdef EXPERIMENTAL_DMARC
1733/* initialize libopendmarc */
1734dmarc_up = dmarc_init();
1735#endif
1736
059ec3d9
PH
1737/* Remember the time of reception. Exim uses time+pid for uniqueness of message
1738ids, and fractions of a second are required. See the comments that precede the
1739message id creation below. */
1740
1741(void)gettimeofday(&message_id_tv, NULL);
1742
1743/* For other uses of the received time we can operate with granularity of one
1744second, and for that we use the global variable received_time. This is for
306c6c77 1745things like ultimate message timeouts. */
059ec3d9 1746
32dfdf8b 1747received_time = message_id_tv;
059ec3d9
PH
1748
1749/* If SMTP input, set the special handler for timeouts. The alarm() calls
1750happen in the smtp_getc() function when it refills its buffer. */
1751
1752if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1753
1754/* If not SMTP input, timeout happens only if configured, and we just set a
1755single timeout for the whole message. */
1756
1757else if (receive_timeout > 0)
1758 {
1759 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1760 alarm(receive_timeout);
1761 }
1762
1763/* SIGTERM and SIGINT are caught always. */
1764
1765signal(SIGTERM, data_sigterm_sigint_handler);
1766signal(SIGINT, data_sigterm_sigint_handler);
1767
1768/* Header lines in messages are not supposed to be very long, though when
1769unfolded, to: and cc: headers can take up a lot of store. We must also cope
1770with the possibility of junk being thrown at us. Start by getting 256 bytes for
1771storing the header, and extend this as necessary using string_cat().
1772
1773To cope with total lunacies, impose an upper limit on the length of the header
1774section of the message, as otherwise the store will fill up. We must also cope
1775with the possibility of binary zeros in the data. Hence we cannot use fgets().
1776Folded header lines are joined into one string, leaving the '\n' characters
1777inside them, so that writing them out reproduces the input.
1778
1779Loop for each character of each header; the next structure for chaining the
1780header is set up already, with ptr the offset of the next character in
1781next->text. */
1782
1783for (;;)
1784 {
bd8fbe36 1785 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
059ec3d9
PH
1786
1787 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1788 SMTP must have a correct "." terminator. */
1789
1790 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1791 {
1792 smtp_reply = handle_lost_connection(US" (header)");
1793 smtp_yield = FALSE;
1794 goto TIDYUP; /* Skip to end of function */
1795 }
1796
1797 /* See if we are at the current header's size limit - there must be at least
1798 four bytes left. This allows for the new character plus a zero, plus two for
1799 extra insertions when we are playing games with dots and carriage returns. If
1800 we are at the limit, extend the text buffer. This could have been done
1801 automatically using string_cat() but because this is a tightish loop storing
1802 only one character at a time, we choose to do it inline. Normally
1803 store_extend() will be able to extend the block; only at the end of a big
1804 store block will a copy be needed. To handle the case of very long headers
1805 (and sometimes lunatic messages can have ones that are 100s of K long) we
1806 call store_release() for strings that have been copied - if the string is at
1807 the start of a block (and therefore the only thing in it, because we aren't
4e6ae623
JH
1808 doing any other gets), the block gets freed. We can only do this release if
1809 there were no allocations since the once that we want to free. */
059ec3d9
PH
1810
1811 if (ptr >= header_size - 4)
1812 {
1813 int oldsize = header_size;
1814 /* header_size += 256; */
1815 header_size *= 2;
1816 if (!store_extend(next->text, oldsize, header_size))
459fca58 1817 next->text = store_newblock(next->text, header_size, ptr);
059ec3d9
PH
1818 }
1819
1820 /* Cope with receiving a binary zero. There is dispute about whether
1821 these should be allowed in RFC 822 messages. The middle view is that they
1822 should not be allowed in headers, at least. Exim takes this attitude at
1823 the moment. We can't just stomp on them here, because we don't know that
1824 this line is a header yet. Set a flag to cause scanning later. */
1825
1826 if (ch == 0) had_zero++;
1827
1828 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1829 those from data files use just LF. Treat LF in local SMTP input as a
1830 terminator too. Treat EOF as a line terminator always. */
1831
1832 if (ch == EOF) goto EOL;
1833
1834 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1835 other MTAs accept this. We are therefore forced into this "liberalisation"
1836 too, so we accept LF as a line terminator whatever the source of the message.
1837 However, if the first line of the message ended with a CRLF, we treat a bare
1838 LF specially by inserting a white space after it to ensure that the header
1839 line is not terminated. */
1840
1841 if (ch == '\n')
1842 {
1843 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
80a47a2c 1844 else if (first_line_ended_crlf) receive_ungetc(' ');
059ec3d9
PH
1845 goto EOL;
1846 }
1847
1848 /* This is not the end of the line. If this is SMTP input and this is
1849 the first character in the line and it is a "." character, ignore it.
1850 This implements the dot-doubling rule, though header lines starting with
1851 dots aren't exactly common. They are legal in RFC 822, though. If the
1852 following is CRLF or LF, this is the line that that terminates the
1853 entire message. We set message_ended to indicate this has happened (to
1854 prevent further reading), and break out of the loop, having freed the
1855 empty header, and set next = NULL to indicate no data line. */
1856
178ecb70 1857 if (ptr == 0 && ch == '.' && dot_ends)
059ec3d9 1858 {
bd8fbe36 1859 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
059ec3d9
PH
1860 if (ch == '\r')
1861 {
bd8fbe36 1862 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
059ec3d9
PH
1863 if (ch != '\n')
1864 {
80a47a2c 1865 receive_ungetc(ch);
059ec3d9
PH
1866 ch = '\r'; /* Revert to CR */
1867 }
1868 }
1869 if (ch == '\n')
1870 {
1871 message_ended = END_DOT;
1872 store_reset(next);
1873 next = NULL;
1874 break; /* End character-reading loop */
1875 }
1876
1877 /* For non-SMTP input, the dot at the start of the line was really a data
1878 character. What is now in ch is the following character. We guaranteed
1879 enough space for this above. */
1880
1881 if (!smtp_input)
1882 {
1883 next->text[ptr++] = '.';
1884 message_size++;
1885 }
1886 }
1887
1888 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1889 remember this case if this is the first line ending. */
1890
1891 if (ch == '\r')
1892 {
bd8fbe36 1893 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
059ec3d9
PH
1894 if (ch == '\n')
1895 {
1896 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1897 goto EOL;
1898 }
1899
1900 /* Otherwise, put back the character after CR, and turn the bare CR
1901 into LF SP. */
1902
80a47a2c 1903 ch = (receive_ungetc)(ch);
059ec3d9
PH
1904 next->text[ptr++] = '\n';
1905 message_size++;
1906 ch = ' ';
1907 }
1908
1909 /* We have a data character for the header line. */
1910
1911 next->text[ptr++] = ch; /* Add to buffer */
1912 message_size++; /* Total message size so far */
1913
1914 /* Handle failure due to a humungously long header section. The >= allows
1915 for the terminating \n. Add what we have so far onto the headers list so
1916 that it gets reflected in any error message, and back up the just-read
1917 character. */
1918
1919 if (message_size >= header_maxsize)
1920 {
1921 next->text[ptr] = 0;
1922 next->slen = ptr;
1923 next->type = htype_other;
1924 next->next = NULL;
1925 header_last->next = next;
1926 header_last = next;
1927
1928 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1929 "%s (more than %d characters): message abandoned",
1930 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1931
1932 if (smtp_input)
1933 {
1934 smtp_reply = US"552 Message header is ridiculously long";
1935 receive_swallow_smtp();
1936 goto TIDYUP; /* Skip to end of function */
1937 }
1938
1939 else
1940 {
1941 give_local_error(ERRMESS_VLONGHEADER,
1942 string_sprintf("message header longer than %d characters received: "
1943 "message not accepted", header_maxsize), US"", error_rc, stdin,
1944 header_list->next);
1945 /* Does not return */
1946 }
1947 }
1948
1949 continue; /* With next input character */
1950
1951 /* End of header line reached */
1952
1953 EOL:
2e0c1448
PH
1954
1955 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1956
1957 receive_linecount++;
1958 message_linecount++;
059ec3d9 1959
d677b2f2
PH
1960 /* Keep track of maximum line length */
1961
1962 if (ptr - prevlines_length > max_received_linelength)
1963 max_received_linelength = ptr - prevlines_length;
1964 prevlines_length = ptr + 1;
1965
059ec3d9
PH
1966 /* Now put in the terminating newline. There is always space for
1967 at least two more characters. */
1968
1969 next->text[ptr++] = '\n';
1970 message_size++;
1971
1972 /* A blank line signals the end of the headers; release the unwanted
1973 space and set next to NULL to indicate this. */
1974
1975 if (ptr == 1)
1976 {
1977 store_reset(next);
1978 next = NULL;
1979 break;
1980 }
1981
1982 /* There is data in the line; see if the next input character is a
1983 whitespace character. If it is, we have a continuation of this header line.
1984 There is always space for at least one character at this point. */
1985
1986 if (ch != EOF)
1987 {
bd8fbe36 1988 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
059ec3d9
PH
1989 if (nextch == ' ' || nextch == '\t')
1990 {
1991 next->text[ptr++] = nextch;
1992 message_size++;
1993 continue; /* Iterate the loop */
1994 }
80a47a2c 1995 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
059ec3d9
PH
1996 else ch = EOF; /* Cause main loop to exit at end */
1997 }
1998
1999 /* We have got to the real line end. Terminate the string and release store
2000 beyond it. If it turns out to be a real header, internal binary zeros will
2001 be squashed later. */
2002
2003 next->text[ptr] = 0;
2004 next->slen = ptr;
2005 store_reset(next->text + ptr + 1);
2006
2007 /* Check the running total size against the overall message size limit. We
2008 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2009 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2010 headers - the code to read the body will then also hit the buffer. */
2011
2012 if (message_size > thismessage_size_limit) break;
2013
2014 /* A line that is not syntactically correct for a header also marks
2015 the end of the headers. In this case, we leave next containing the
2016 first data line. This might actually be several lines because of the
2017 continuation logic applied above, but that doesn't matter.
2018
2019 It turns out that smail, and presumably sendmail, accept leading lines
2020 of the form
2021
2022 From ph10 Fri Jan 5 12:35 GMT 1996
2023
2024 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2025 find any documentation of this, but for compatibility it had better be
2026 accepted. Exim restricts it to the case of non-smtp messages, and
2027 treats it as an alternative to the -f command line option. Thus it is
2028 ignored except for trusted users or filter testing. Otherwise it is taken
2029 as the sender address, unless -f was used (sendmail compatibility).
2030
2031 It further turns out that some UUCPs generate the From_line in a different
2032 format, e.g.
2033
2034 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2035
2036 The regex for matching these things is now capable of recognizing both
2037 formats (including 2- and 4-digit years in the latter). In fact, the regex
2038 is now configurable, as is the expansion string to fish out the sender.
2039
2040 Even further on it has been discovered that some broken clients send
2041 these lines in SMTP messages. There is now an option to ignore them from
2042 specified hosts or networks. Sigh. */
2043
d21bf202
JH
2044 if ( header_last == header_list
2045 && ( !smtp_input
2046 || ( sender_host_address
2047 && verify_check_host(&ignore_fromline_hosts) == OK
2048 )
2049 || (!sender_host_address && ignore_fromline_local)
2050 )
2051 && regex_match_and_setup(regex_From, next->text, 0, -1)
2052 )
059ec3d9
PH
2053 {
2054 if (!sender_address_forced)
2055 {
2056 uschar *uucp_sender = expand_string(uucp_from_sender);
d21bf202 2057 if (!uucp_sender)
059ec3d9
PH
2058 log_write(0, LOG_MAIN|LOG_PANIC,
2059 "expansion of \"%s\" failed after matching "
2060 "\"From \" line: %s", uucp_from_sender, expand_string_message);
059ec3d9
PH
2061 else
2062 {
2063 int start, end, domain;
2064 uschar *errmess;
2065 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2066 &start, &end, &domain, TRUE);
d21bf202 2067 if (newsender)
059ec3d9
PH
2068 {
2069 if (domain == 0 && newsender[0] != 0)
2070 newsender = rewrite_address_qualify(newsender, FALSE);
2071
f05da2e8 2072 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
059ec3d9
PH
2073 {
2074 sender_address = newsender;
2075
f05da2e8 2076 if (trusted_caller || filter_test != FTEST_NONE)
059ec3d9
PH
2077 {
2078 authenticated_sender = NULL;
2079 originator_name = US"";
2080 sender_local = FALSE;
2081 }
2082
f05da2e8 2083 if (filter_test != FTEST_NONE)
059ec3d9
PH
2084 printf("Sender taken from \"From \" line\n");
2085 }
2086 }
2087 }
2088 }
2089 }
2090
2091 /* Not a leading "From " line. Check to see if it is a valid header line.
2092 Header names may contain any non-control characters except space and colon,
2093 amazingly. */
2094
2095 else
2096 {
2097 uschar *p = next->text;
2098
2099 /* If not a valid header line, break from the header reading loop, leaving
2100 next != NULL, indicating that it holds the first line of the body. */
2101
2102 if (isspace(*p)) break;
2103 while (mac_isgraph(*p) && *p != ':') p++;
2104 while (isspace(*p)) p++;
2105 if (*p != ':')
2106 {
2107 body_zerocount = had_zero;
2108 break;
2109 }
2110
2111 /* We have a valid header line. If there were any binary zeroes in
2112 the line, stomp on them here. */
2113
2114 if (had_zero > 0)
2115 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2116
2117 /* It is perfectly legal to have an empty continuation line
2118 at the end of a header, but it is confusing to humans
2119 looking at such messages, since it looks like a blank line.
2120 Reduce confusion by removing redundant white space at the
2121 end. We know that there is at least one printing character
2122 (the ':' tested for above) so there is no danger of running
2123 off the end. */
2124
2125 p = next->text + ptr - 2;
2126 for (;;)
2127 {
2128 while (*p == ' ' || *p == '\t') p--;
2129 if (*p != '\n') break;
2130 ptr = (p--) - next->text + 1;
2131 message_size -= next->slen - ptr;
2132 next->text[ptr] = 0;
2133 next->slen = ptr;
2134 }
2135
2136 /* Add the header to the chain */
2137
2138 next->type = htype_other;
2139 next->next = NULL;
2140 header_last->next = next;
2141 header_last = next;
2142
2143 /* Check the limit for individual line lengths. This comes after adding to
2144 the chain so that the failing line is reflected if a bounce is generated
2145 (for a local message). */
2146
2147 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2148 {
2149 log_write(0, LOG_MAIN, "overlong message header line received from "
2150 "%s (more than %d characters): message abandoned",
2151 sender_host_unknown? sender_ident : sender_fullhost,
2152 header_line_maxsize);
2153
2154 if (smtp_input)
2155 {
2156 smtp_reply = US"552 A message header line is too long";
2157 receive_swallow_smtp();
2158 goto TIDYUP; /* Skip to end of function */
2159 }
2160
2161 else
059ec3d9
PH
2162 give_local_error(ERRMESS_VLONGHDRLINE,
2163 string_sprintf("message header line longer than %d characters "
2164 "received: message not accepted", header_line_maxsize), US"",
2165 error_rc, stdin, header_list->next);
2166 /* Does not return */
059ec3d9
PH
2167 }
2168
2169 /* Note if any resent- fields exist. */
2170
2171 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2172 {
2173 resents_exist = TRUE;
2174 resent_prefix = US"Resent-";
2175 }
2176 }
2177
1ebe15c3
JH
2178 /* Reject CHUNKING messages that do not CRLF their first header line */
2179
2180 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2181 {
2182 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2183 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2184 sender_address,
2185 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2186 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
925ac8e4 2187 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
1ebe15c3
JH
2188 bdat_flush_data();
2189 smtp_reply = US"";
2190 goto TIDYUP; /* Skip to end of function */
2191 }
2192
059ec3d9
PH
2193 /* The line has been handled. If we have hit EOF, break out of the loop,
2194 indicating no pending data line. */
2195
2196 if (ch == EOF) { next = NULL; break; }
2197
2198 /* Set up for the next header */
2199
2200 header_size = 256;
2201 next = store_get(sizeof(header_line));
2202 next->text = store_get(header_size);
2203 ptr = 0;
2204 had_zero = 0;
d677b2f2 2205 prevlines_length = 0;
059ec3d9
PH
2206 } /* Continue, starting to read the next header */
2207
2208/* At this point, we have read all the headers into a data structure in main
2209store. The first header is still the dummy placeholder for the Received: header
2210we are going to generate a bit later on. If next != NULL, it contains the first
2211data line - which terminated the headers before reaching a blank line (not the
2212normal case). */
2213
2214DEBUG(D_receive)
2215 {
2216 debug_printf(">>Headers received:\n");
1ebe15c3 2217 for (h = header_list->next; h; h = h->next)
059ec3d9
PH
2218 debug_printf("%s", h->text);
2219 debug_printf("\n");
2220 }
2221
2222/* End of file on any SMTP connection is an error. If an incoming SMTP call
2223is dropped immediately after valid headers, the next thing we will see is EOF.
2224We must test for this specially, as further down the reading of the data is
2225skipped if already at EOF. */
2226
2227if (smtp_input && (receive_feof)())
2228 {
2229 smtp_reply = handle_lost_connection(US" (after header)");
2230 smtp_yield = FALSE;
2231 goto TIDYUP; /* Skip to end of function */
2232 }
2233
2234/* If this is a filter test run and no headers were read, output a warning
2235in case there is a mistake in the test message. */
2236
f05da2e8 2237if (filter_test != FTEST_NONE && header_list->next == NULL)
059ec3d9
PH
2238 printf("Warning: no message headers read\n");
2239
2240
2241/* Scan the headers to identify them. Some are merely marked for later
2242processing; some are dealt with here. */
2243
1ebe15c3 2244for (h = header_list->next; h; h = h->next)
059ec3d9
PH
2245 {
2246 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2247 if (is_resent) contains_resent_headers = TRUE;
2248
2249 switch (header_checkname(h, is_resent))
2250 {
059ec3d9 2251 case htype_bcc:
2cbb4081 2252 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
059ec3d9
PH
2253 break;
2254
059ec3d9 2255 case htype_cc:
2cbb4081 2256 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
059ec3d9
PH
2257 break;
2258
2259 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2260
2261 case htype_date:
4c69d561 2262 if (!resents_exist || is_resent) date_header_exists = TRUE;
059ec3d9
PH
2263 break;
2264
2265 /* Same comments as about Return-Path: below. */
2266
2267 case htype_delivery_date:
2268 if (delivery_date_remove) h->type = htype_old;
2269 break;
2270
2271 /* Same comments as about Return-Path: below. */
2272
2273 case htype_envelope_to:
2274 if (envelope_to_remove) h->type = htype_old;
2275 break;
2276
2277 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2278 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2279 header consists of just the login id of the user who called Exim, rewrite
2280 it with the gecos field first. Apply this rule to Resent-From: if there
2281 are resent- fields. */
2282
2283 case htype_from:
2284 h->type = htype_from;
2285 if (!resents_exist || is_resent)
2286 {
2287 from_header = h;
2288 if (!smtp_input)
2289 {
5de8faa3 2290 int len;
059ec3d9
PH
2291 uschar *s = Ustrchr(h->text, ':') + 1;
2292 while (isspace(*s)) s++;
5de8faa3 2293 len = h->slen - (s - h->text) - 1;
e0fccd1d
TF
2294 if (Ustrlen(originator_login) == len &&
2295 strncmpic(s, originator_login, len) == 0)
059ec3d9
PH
2296 {
2297 uschar *name = is_resent? US"Resent-From" : US"From";
2298 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2299 originator_login, qualify_domain_sender);
2300 from_header = header_last;
2301 h->type = htype_old;
2302 DEBUG(D_receive|D_rewrite)
2303 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2304 }
2305 }
2306 }
2307 break;
2308
2309 /* Identify the Message-id: header for generating "in-reply-to" in the
2310 autoreply transport. For incoming logging, save any resent- value. In both
2311 cases, take just the first of any multiples. */
2312
2313 case htype_id:
2314 if (msgid_header == NULL && (!resents_exist || is_resent))
2315 {
2316 msgid_header = h;
2317 h->type = htype_id;
2318 }
2319 break;
2320
2321 /* Flag all Received: headers */
2322
2323 case htype_received:
2324 h->type = htype_received;
2325 received_count++;
2326 break;
2327
2328 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2329
2330 case htype_reply_to:
2331 h->type = htype_reply_to;
2332 break;
2333
2334 /* The Return-path: header is supposed to be added to messages when
2335 they leave the SMTP system. We shouldn't receive messages that already
2336 contain Return-path. However, since Exim generates Return-path: on
2337 local delivery, resent messages may well contain it. We therefore
2338 provide an option (which defaults on) to remove any Return-path: headers
2339 on input. Removal actually means flagging as "old", which prevents the
2340 header being transmitted with the message. */
2341
2342 case htype_return_path:
2343 if (return_path_remove) h->type = htype_old;
2344
2345 /* If we are testing a mail filter file, use the value of the
2346 Return-Path: header to set up the return_path variable, which is not
2347 otherwise set. However, remove any <> that surround the address
2348 because the variable doesn't have these. */
2349
f05da2e8 2350 if (filter_test != FTEST_NONE)
059ec3d9
PH
2351 {
2352 uschar *start = h->text + 12;
2353 uschar *end = start + Ustrlen(start);
2354 while (isspace(*start)) start++;
2355 while (end > start && isspace(end[-1])) end--;
2356 if (*start == '<' && end[-1] == '>')
2357 {
2358 start++;
2359 end--;
2360 }
2361 return_path = string_copyn(start, end - start);
2362 printf("Return-path taken from \"Return-path:\" header line\n");
2363 }
2364 break;
2365
2366 /* If there is a "Sender:" header and the message is locally originated,
8800895a
PH
2367 and from an untrusted caller and suppress_local_fixups is not set, or if we
2368 are in submission mode for a remote message, mark it "old" so that it will
2369 not be transmitted with the message, unless active_local_sender_retain is
2370 set. (This can only be true if active_local_from_check is false.) If there
2371 are any resent- headers in the message, apply this rule to Resent-Sender:
2372 instead of Sender:. Messages with multiple resent- header sets cannot be
2373 tidily handled. (For this reason, at least one MUA - Pine - turns old
2374 resent- headers into X-resent- headers when resending, leaving just one
2375 set.) */
059ec3d9
PH
2376
2377 case htype_sender:
69358f02 2378 h->type = ((!active_local_sender_retain &&
8800895a
PH
2379 (
2380 (sender_local && !trusted_caller && !suppress_local_fixups)
2381 || submission_mode
2382 )
059ec3d9
PH
2383 ) &&
2384 (!resents_exist||is_resent))?
2385 htype_old : htype_sender;
2386 break;
2387
2388 /* Remember the Subject: header for logging. There is no Resent-Subject */
2389
2390 case htype_subject:
2391 subject_header = h;
2392 break;
2393
2394 /* "To:" gets flagged, and the existence of a recipient header is noted,
2395 whether it's resent- or not. */
2396
2397 case htype_to:
2398 h->type = htype_to;
2399 /****
2400 to_or_cc_header_exists = TRUE;
2401 ****/
2402 break;
2403 }
2404 }
2405
2406/* Extract recipients from the headers if that is required (the -t option).
2407Note that this is documented as being done *before* any address rewriting takes
2408place. There are two possibilities:
2409
2410(1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2411recipients already listed are to be REMOVED from the message. Smail 3 works
2412like this. We need to build a non-recipients tree for that list, because in
2413subsequent processing this data is held in a tree and that's what the
2414spool_write_header() function expects. Make sure that non-recipient addresses
2415are fully qualified and rewritten if necessary.
2416
2417(2) According to other sendmail documentation, -t ADDS extracted recipients to
2418those in the command line arguments (and it is rumoured some other MTAs do
2419this). Therefore, there is an option to make Exim behave this way.
2420
2421*** Notes on "Resent-" header lines ***
2422
2423The presence of resent-headers in the message makes -t horribly ambiguous.
2424Experiments with sendmail showed that it uses recipients for all resent-
2425headers, totally ignoring the concept of "sets of resent- headers" as described
2426in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2427with all the addresses in one instance of each header.
2428
2429This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2430error for -t if there were resent- headers in the message. However, after a
2431discussion on the mailing list, I've learned that there are MUAs that use
2432resent- headers with -t, and also that the stuff about sets of resent- headers
2433and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2434message with -t and resent- header lines makes sure that only *its* resent-
2435headers are present; previous ones are often renamed as X-resent- for example.
2436
2437Consequently, Exim has been changed so that, if any resent- header lines are
2438present, the recipients are taken from all of the appropriate resent- lines,
2439and not from the ordinary To:, Cc:, etc. */
2440
2441if (extract_recip)
2442 {
2443 int rcount = 0;
2444 error_block **bnext = &bad_addresses;
2445
2446 if (extract_addresses_remove_arguments)
2447 {
2448 while (recipients_count-- > 0)
2449 {
2450 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2451 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2452 tree_add_nonrecipient(s);
2453 }
2454 recipients_list = NULL;
2455 recipients_count = recipients_list_max = 0;
2456 }
2457
059ec3d9
PH
2458 /* Now scan the headers */
2459
1ebe15c3 2460 for (h = header_list->next; h; h = h->next)
059ec3d9
PH
2461 {
2462 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2463 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2464 {
2465 uschar *s = Ustrchr(h->text, ':') + 1;
2466 while (isspace(*s)) s++;
2467
1eccaa59
PH
2468 parse_allow_group = TRUE; /* Allow address group syntax */
2469
059ec3d9
PH
2470 while (*s != 0)
2471 {
2472 uschar *ss = parse_find_address_end(s, FALSE);
2473 uschar *recipient, *errmess, *p, *pp;
2474 int start, end, domain;
2475
2476 /* Check on maximum */
2477
2478 if (recipients_max > 0 && ++rcount > recipients_max)
2479 {
2480 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2481 US"message rejected: ", error_rc, stdin, NULL);
2482 /* Does not return */
2483 }
2484
2485 /* Make a copy of the address, and remove any internal newlines. These
2486 may be present as a result of continuations of the header line. The
2487 white space that follows the newline must not be removed - it is part
2488 of the header. */
2489
2490 pp = recipient = store_get(ss - s + 1);
2491 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2492 *pp = 0;
250b6871 2493
8c5d388a 2494#ifdef SUPPORT_I18N
250b6871
JH
2495 {
2496 BOOL b = allow_utf8_domains;
2497 allow_utf8_domains = TRUE;
2498#endif
059ec3d9
PH
2499 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2500 &domain, FALSE);
2501
8c5d388a 2502#ifdef SUPPORT_I18N
250b6871
JH
2503 if (string_is_utf8(recipient))
2504 message_smtputf8 = TRUE;
2505 else
2506 allow_utf8_domains = b;
2507 }
2508#endif
2509
059ec3d9
PH
2510 /* Keep a list of all the bad addresses so we can send a single
2511 error message at the end. However, an empty address is not an error;
2512 just ignore it. This can come from an empty group list like
2513
2514 To: Recipients of list:;
2515
2516 If there are no recipients at all, an error will occur later. */
2517
2518 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2519 {
2520 int len = Ustrlen(s);
2521 error_block *b = store_get(sizeof(error_block));
2522 while (len > 0 && isspace(s[len-1])) len--;
2523 b->next = NULL;
2524 b->text1 = string_printing(string_copyn(s, len));
2525 b->text2 = errmess;
2526 *bnext = b;
2527 bnext = &(b->next);
2528 }
2529
2530 /* If the recipient is already in the nonrecipients tree, it must
2531 have appeared on the command line with the option extract_addresses_
2532 remove_arguments set. Do not add it to the recipients, and keep a note
2533 that this has happened, in order to give a better error if there are
2534 no recipients left. */
2535
2536 else if (recipient != NULL)
2537 {
2538 if (tree_search(tree_nonrecipients, recipient) == NULL)
2539 receive_add_recipient(recipient, -1);
2540 else
2541 extracted_ignored = TRUE;
2542 }
2543
2544 /* Move on past this address */
2545
2546 s = ss + (*ss? 1:0);
2547 while (isspace(*s)) s++;
1eccaa59
PH
2548 } /* Next address */
2549
2550 parse_allow_group = FALSE; /* Reset group syntax flags */
2551 parse_found_group = FALSE;
059ec3d9
PH
2552
2553 /* If this was the bcc: header, mark it "old", which means it
2554 will be kept on the spool, but not transmitted as part of the
2555 message. */
2556
2cbb4081 2557 if (h->type == htype_bcc) h->type = htype_old;
059ec3d9
PH
2558 } /* For appropriate header line */
2559 } /* For each header line */
2560
059ec3d9
PH
2561 }
2562
2563/* Now build the unique message id. This has changed several times over the
2564lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2565Retaining all the history in the comment has become too unwieldy - read
2566previous release sources if you want it.
2567
2568The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2569The first part is the current time, in seconds. The second part is the current
2570pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2571can hold a number in the range 0-3843. It used to be a computed sequence
2572number, but is now the fractional component of the current time in units of
25731/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2574received, Exim ensures that the timer has ticked at the appropriate level
2575before proceeding, to avoid duplication if the pid happened to be re-used
2576within the same time period. It seems likely that most messages will take at
2577least half a millisecond to be received, so no delay will normally be
2578necessary. At least for some time...
2579
2580There is a modification when localhost_number is set. Formerly this was allowed
2581to be as large as 255. Now it is restricted to the range 0-16, and the final
2582component of the message id becomes (localhost_number * 200) + fractional time
2583in units of 1/200 of a second (i.e. a value in the range 0-3399).
2584
2585Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2586Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2587still allows the tttttt field to hold a large enough number to last for some
2588more decades, and the final two-digit field can hold numbers up to 1295, which
2589is enough for milliseconds (instead of 1/2000 of a second).
2590
2591However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2592pid, so it is probably safe because pids have to be positive. The
2593localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2594final field becomes (localhost_number * 100) + fractional time in centiseconds.
2595
2596Note that string_base62() returns its data in a static storage block, so it
2597must be copied before calling string_base62() again. It always returns exactly
25986 characters.
2599
2600There doesn't seem to be anything in the RFC which requires a message id to
2601start with a letter, but Smail was changed to ensure this. The external form of
2602the message id (as supplied by string expansion) therefore starts with an
2603additional leading 'E'. The spool file names do not include this leading
2604letter and it is not used internally.
2605
2606NOTE: If ever the format of message ids is changed, the regular expression for
2607checking that a string is in this format must be updated in a corresponding
2608way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2540f2f8
JH
2609must also be changed to reflect the correct string length. The queue-sort code
2610needs to know the layout. Then, of course, other programs that rely on the
2611message id format will need updating too. */
059ec3d9
PH
2612
2613Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2614message_id[6] = '-';
2615Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2616
2617/* Deal with the case where the host number is set. The value of the number was
2618checked when it was read, to ensure it isn't too big. The timing granularity is
2619left in id_resolution so that an appropriate wait can be done after receiving
2620the message, if necessary (we hope it won't be). */
2621
306c6c77 2622if (host_number_string)
059ec3d9
PH
2623 {
2624 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2625 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2626 string_base62((long int)(
2627 host_number * (1000000/id_resolution) +
2628 message_id_tv.tv_usec/id_resolution)) + 4);
2629 }
2630
2631/* Host number not set: final field is just the fractional time at an
2632appropriate resolution. */
2633
2634else
2635 {
2636 id_resolution = (BASE_62 == 62)? 500 : 1000;
2637 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2638 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2639 }
2640
2641/* Add the current message id onto the current process info string if
2642it will fit. */
2643
2644(void)string_format(process_info + process_info_len,
2645 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2646
2647/* If we are using multiple input directories, set up the one for this message
2648to be the least significant base-62 digit of the time of arrival. Otherwise
2649ensure that it is an empty string. */
2650
a2da3176 2651message_subdir[0] = split_spool_directory ? message_id[5] : 0;
059ec3d9
PH
2652
2653/* Now that we have the message-id, if there is no message-id: header, generate
8800895a
PH
2654one, but only for local (without suppress_local_fixups) or submission mode
2655messages. This can be user-configured if required, but we had better flatten
2656any illegal characters therein. */
059ec3d9 2657
306c6c77
JH
2658if ( !msgid_header
2659 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
059ec3d9
PH
2660 {
2661 uschar *p;
2662 uschar *id_text = US"";
2663 uschar *id_domain = primary_hostname;
2664
2665 /* Permit only letters, digits, dots, and hyphens in the domain */
2666
306c6c77 2667 if (message_id_domain)
059ec3d9
PH
2668 {
2669 uschar *new_id_domain = expand_string(message_id_domain);
306c6c77 2670 if (!new_id_domain)
059ec3d9
PH
2671 {
2672 if (!expand_string_forcedfail)
2673 log_write(0, LOG_MAIN|LOG_PANIC,
2674 "expansion of \"%s\" (message_id_header_domain) "
2675 "failed: %s", message_id_domain, expand_string_message);
2676 }
306c6c77 2677 else if (*new_id_domain)
059ec3d9
PH
2678 {
2679 id_domain = new_id_domain;
306c6c77 2680 for (p = id_domain; *p; p++)
059ec3d9
PH
2681 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2682 }
2683 }
2684
2685 /* Permit all characters except controls and RFC 2822 specials in the
2686 additional text part. */
2687
306c6c77 2688 if (message_id_text)
059ec3d9
PH
2689 {
2690 uschar *new_id_text = expand_string(message_id_text);
306c6c77 2691 if (!new_id_text)
059ec3d9
PH
2692 {
2693 if (!expand_string_forcedfail)
2694 log_write(0, LOG_MAIN|LOG_PANIC,
2695 "expansion of \"%s\" (message_id_header_text) "
2696 "failed: %s", message_id_text, expand_string_message);
2697 }
306c6c77 2698 else if (*new_id_text)
059ec3d9
PH
2699 {
2700 id_text = new_id_text;
306c6c77 2701 for (p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
059ec3d9
PH
2702 }
2703 }
2704
e7e680d6
PP
2705 /* Add the header line
2706 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2707 * appended, to preserve classical expectations of header ordering. */
059ec3d9 2708
e7e680d6 2709 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
5eb690a1
NM
2710 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2711 (*id_text == 0)? "" : ".", id_text, id_domain);
059ec3d9
PH
2712 }
2713
2714/* If we are to log recipients, keep a copy of the raw ones before any possible
2715rewriting. Must copy the count, because later ACLs and the local_scan()
2716function may mess with the real recipients. */
2717
6c6d6e48 2718if (LOGGING(received_recipients))
059ec3d9
PH
2719 {
2720 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2721 for (i = 0; i < recipients_count; i++)
2722 raw_recipients[i] = string_copy(recipients_list[i].address);
2723 raw_recipients_count = recipients_count;
2724 }
2725
2726/* Ensure the recipients list is fully qualified and rewritten. Unqualified
2727recipients will get here only if the conditions were right (allow_unqualified_
2728recipient is TRUE). */
2729
2730for (i = 0; i < recipients_count; i++)
2731 recipients_list[i].address =
2732 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2733 global_rewrite_rules, rewrite_existflags);
2734
8800895a
PH
2735/* If there is no From: header, generate one for local (without
2736suppress_local_fixups) or submission_mode messages. If there is no sender
2737address, but the sender is local or this is a local delivery error, use the
2738originator login. This shouldn't happen for genuine bounces, but might happen
2739for autoreplies. The addition of From: must be done *before* checking for the
2740possible addition of a Sender: header, because untrusted_set_sender allows an
2741untrusted user to set anything in the envelope (which might then get info
2742From:) but we still want to ensure a valid Sender: if it is required. */
2743
306c6c77
JH
2744if ( !from_header
2745 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
059ec3d9 2746 {
2fe1a124
PH
2747 uschar *oname = US"";
2748
2749 /* Use the originator_name if this is a locally submitted message and the
2750 caller is not trusted. For trusted callers, use it only if -F was used to
2751 force its value or if we have a non-SMTP message for which -f was not used
2752 to set the sender. */
2753
306c6c77 2754 if (!sender_host_address)
2fe1a124
PH
2755 {
2756 if (!trusted_caller || sender_name_forced ||
2757 (!smtp_input && !sender_address_forced))
2758 oname = originator_name;
2759 }
2760
2761 /* For non-locally submitted messages, the only time we use the originator
2762 name is when it was forced by the /name= option on control=submission. */
2763
306c6c77 2764 else if (submission_name) oname = submission_name;
2fe1a124 2765
059ec3d9
PH
2766 /* Envelope sender is empty */
2767
306c6c77 2768 if (!*sender_address)
059ec3d9 2769 {
87ba3f5f
PH
2770 uschar *fromstart, *fromend;
2771
306c6c77
JH
2772 fromstart = string_sprintf("%sFrom: %s%s",
2773 resent_prefix, oname, *oname ? " <" : "");
2774 fromend = *oname ? US">" : US"";
87ba3f5f 2775
059ec3d9 2776 if (sender_local || local_error_message)
87ba3f5f
PH
2777 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2778 local_part_quote(originator_login), qualify_domain_sender,
2779 fromend);
306c6c77
JH
2780
2781 else if (submission_mode && authenticated_id)
059ec3d9 2782 {
306c6c77 2783 if (!submission_domain)
87ba3f5f
PH
2784 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2785 local_part_quote(authenticated_id), qualify_domain_sender,
2786 fromend);
306c6c77
JH
2787
2788 else if (!*submission_domain) /* empty => whole address set */
87ba3f5f
PH
2789 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2790 fromend);
306c6c77 2791
059ec3d9 2792 else
87ba3f5f 2793 header_add(htype_from, "%s%s@%s%s\n", fromstart,
306c6c77
JH
2794 local_part_quote(authenticated_id), submission_domain, fromend);
2795
059ec3d9
PH
2796 from_header = header_last; /* To get it checked for Sender: */
2797 }
2798 }
2799
2800 /* There is a non-null envelope sender. Build the header using the original
2801 sender address, before any rewriting that might have been done while
2802 verifying it. */
2803
2804 else
2805 {
87ba3f5f 2806 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2fe1a124 2807 oname,
306c6c77
JH
2808 *oname ? " <" : "",
2809 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2810 *oname ? ">" : "");
059ec3d9
PH
2811
2812 from_header = header_last; /* To get it checked for Sender: */
2813 }
2814 }
2815
2816
8800895a
PH
2817/* If the sender is local (without suppress_local_fixups), or if we are in
2818submission mode and there is an authenticated_id, check that an existing From:
2819is correct, and if not, generate a Sender: header, unless disabled. Any
2820previously-existing Sender: header was removed above. Note that sender_local,
2821as well as being TRUE if the caller of exim is not trusted, is also true if a
2822trusted caller did not supply a -f argument for non-smtp input. To allow
2823trusted callers to forge From: without supplying -f, we have to test explicitly
2824here. If the From: header contains more than one address, then the call to
2825parse_extract_address fails, and a Sender: header is inserted, as required. */
059ec3d9 2826
306c6c77
JH
2827if ( from_header
2828 && ( active_local_from_check
2829 && ( sender_local && !trusted_caller && !suppress_local_fixups
2830 || submission_mode && authenticated_id
2831 ) ) )
059ec3d9
PH
2832 {
2833 BOOL make_sender = TRUE;
2834 int start, end, domain;
2835 uschar *errmess;
2836 uschar *from_address =
2837 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2838 &start, &end, &domain, FALSE);
2839 uschar *generated_sender_address;
2840
306c6c77
JH
2841 generated_sender_address = submission_mode
2842 ? !submission_domain
2843 ? string_sprintf("%s@%s",
2844 local_part_quote(authenticated_id), qualify_domain_sender)
2845 : !*submission_domain /* empty => full address */
2846 ? string_sprintf("%s", authenticated_id)
2847 : string_sprintf("%s@%s",
2848 local_part_quote(authenticated_id), submission_domain)
2849 : string_sprintf("%s@%s",
2850 local_part_quote(originator_login), qualify_domain_sender);
059ec3d9
PH
2851
2852 /* Remove permitted prefixes and suffixes from the local part of the From:
2853 address before doing the comparison with the generated sender. */
2854
306c6c77 2855 if (from_address)
059ec3d9
PH
2856 {
2857 int slen;
306c6c77 2858 uschar *at = domain ? from_address + domain - 1 : NULL;
059ec3d9 2859
306c6c77 2860 if (at) *at = 0;
059ec3d9
PH
2861 from_address += route_check_prefix(from_address, local_from_prefix);
2862 slen = route_check_suffix(from_address, local_from_suffix);
2863 if (slen > 0)
2864 {
2865 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2866 from_address += slen;
2867 }
306c6c77 2868 if (at) *at = '@';
059ec3d9 2869
306c6c77
JH
2870 if ( strcmpic(generated_sender_address, from_address) == 0
2871 || (!domain && strcmpic(from_address, originator_login) == 0))
059ec3d9
PH
2872 make_sender = FALSE;
2873 }
2874
2875 /* We have to cause the Sender header to be rewritten if there are
2876 appropriate rewriting rules. */
2877
2878 if (make_sender)
306c6c77 2879 if (submission_mode && !submission_name)
059ec3d9
PH
2880 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2881 generated_sender_address);
2882 else
2883 header_add(htype_sender, "%sSender: %s <%s>\n",
2fe1a124
PH
2884 resent_prefix,
2885 submission_mode? submission_name : originator_name,
2886 generated_sender_address);
87ba3f5f
PH
2887
2888 /* Ensure that a non-null envelope sender address corresponds to the
2889 submission mode sender address. */
2890
306c6c77 2891 if (submission_mode && *sender_address)
87ba3f5f 2892 {
306c6c77 2893 if (!sender_address_unrewritten)
87ba3f5f
PH
2894 sender_address_unrewritten = sender_address;
2895 sender_address = generated_sender_address;
089793a4
TF
2896 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2897 log_write(L_address_rewrite, LOG_MAIN,
2898 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2899 sender_address_unrewritten, generated_sender_address);
87ba3f5f 2900 }
059ec3d9
PH
2901 }
2902
059ec3d9
PH
2903/* If there are any rewriting rules, apply them to the sender address, unless
2904it has already been rewritten as part of verification for SMTP input. */
2905
306c6c77 2906if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
059ec3d9
PH
2907 {
2908 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2909 global_rewrite_rules, rewrite_existflags);
2910 DEBUG(D_receive|D_rewrite)
2911 debug_printf("rewritten sender = %s\n", sender_address);
2912 }
2913
2914
2915/* The headers must be run through rewrite_header(), because it ensures that
2916addresses are fully qualified, as well as applying any rewriting rules that may
2917exist.
2918
2919Qualification of header addresses in a message from a remote host happens only
2920if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2921appropriate. For local messages, qualification always happens, unless -bnq is
2922used to explicitly suppress it. No rewriting is done for an unqualified address
2923that is left untouched.
2924
2925We start at the second header, skipping our own Received:. This rewriting is
2926documented as happening *after* recipient addresses are taken from the headers
2927by the -t command line option. An added Sender: gets rewritten here. */
2928
1ebe15c3 2929for (h = header_list->next; h; h = h->next)
059ec3d9
PH
2930 {
2931 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2932 rewrite_existflags, TRUE);
1ebe15c3 2933 if (newh) h = newh;
059ec3d9
PH
2934 }
2935
2936
2937/* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2cbb4081 2938"cc", or "bcc". Note that although the minimal examples in RFC 822 show just
059ec3d9
PH
2939"to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2940exists, this applies to the set of resent- headers rather than the normal set.
2941
2cbb4081
PH
2942The requirement for a recipient header has been removed in RFC 2822. At this
2943point in the code, earlier versions of Exim added a To: header for locally
2944submitted messages, and an empty Bcc: header for others. In the light of the
2945changes in RFC 2822, this was dropped in November 2003. */
059ec3d9 2946
059ec3d9
PH
2947
2948/* If there is no date header, generate one if the message originates locally
8800895a
PH
2949(i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2950submission mode flag is set. Messages without Date: are not valid, but it seems
e7e680d6
PP
2951to be more confusing if Exim adds one to all remotely-originated messages.
2952As per Message-Id, we prepend if resending, else append.
2953*/
059ec3d9 2954
306c6c77
JH
2955if ( !date_header_exists
2956 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
e7e680d6
PP
2957 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2958 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
059ec3d9
PH
2959
2960search_tidyup(); /* Free any cached resources */
2961
2962/* Show the complete set of headers if debugging. Note that the first one (the
2963new Received:) has not yet been set. */
2964
2965DEBUG(D_receive)
2966 {
2967 debug_printf(">>Headers after rewriting and local additions:\n");
306c6c77 2968 for (h = header_list->next; h; h = h->next)
059ec3d9
PH
2969 debug_printf("%c %s", h->type, h->text);
2970 debug_printf("\n");
2971 }
2972
2973/* The headers are now complete in store. If we are running in filter
2974testing mode, that is all this function does. Return TRUE if the message
2975ended with a dot. */
2976
f05da2e8 2977if (filter_test != FTEST_NONE)
059ec3d9
PH
2978 {
2979 process_info[process_info_len] = 0;
2980 return message_ended == END_DOT;
2981 }
2982
7e3ce68e
JH
2983/*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2984think more if it could be handled. Cannot do onward CHUNKING unless
2985inbound is, but inbound chunking ought to be ok with outbound plain.
2986Could we do onward CHUNKING given inbound CHUNKING?
2987*/
2988if (chunking_state > CHUNKING_OFFERED)
57cc2785 2989 cancel_cutthrough_connection(FALSE, US"chunking active");
7e3ce68e 2990
817d9f57 2991/* Cutthrough delivery:
5032d1cf
JH
2992We have to create the Received header now rather than at the end of reception,
2993so the timestamp behaviour is a change to the normal case.
5032d1cf 2994Having created it, send the headers to the destination. */
57cc2785
JH
2995
2996if (cutthrough.fd >= 0 && cutthrough.delivery)
e4bdf652 2997 {
817d9f57
JH
2998 if (received_count > received_headers_max)
2999 {
57cc2785 3000 cancel_cutthrough_connection(TRUE, US"too many headers");
817d9f57
JH
3001 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3002 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3003 "Too many \"Received\" headers",
3004 sender_address,
57cc2785
JH
3005 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3006 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
817d9f57
JH
3007 message_id[0] = 0; /* Indicate no message accepted */
3008 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3009 goto TIDYUP; /* Skip to end of function */
3010 }
e4bdf652 3011 received_header_gen();
578d43dc 3012 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
e4bdf652
JH
3013 (void) cutthrough_headers_send();
3014 }
61147df4 3015
e4bdf652 3016
059ec3d9
PH
3017/* Open a new spool file for the data portion of the message. We need
3018to access it both via a file descriptor and a stream. Try to make the
41313d92 3019directory if it isn't there. */
059ec3d9 3020
41313d92 3021spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
a2da3176
JH
3022DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3023
3024if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
059ec3d9
PH
3025 {
3026 if (errno == ENOENT)
3027 {
0971ec06 3028 (void) directory_make(spool_directory,
41313d92
JH
3029 spool_sname(US"input", message_subdir),
3030 INPUT_DIRECTORY_MODE, TRUE);
059ec3d9
PH
3031 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3032 }
3033 if (data_fd < 0)
3034 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3035 spool_name, strerror(errno));
3036 }
3037
3038/* Make sure the file's group is the Exim gid, and double-check the mode
3039because the group setting doesn't always get set automatically. */
3040
1ac6b2e7
JH
3041if (fchown(data_fd, exim_uid, exim_gid))
3042 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3043 "Failed setting ownership on spool file %s: %s",
3044 spool_name, strerror(errno));
ff790e47 3045(void)fchmod(data_fd, SPOOL_MODE);
059ec3d9
PH
3046
3047/* We now have data file open. Build a stream for it and lock it. We lock only
3048the first line of the file (containing the message ID) because otherwise there
3049are problems when Exim is run under Cygwin (I'm told). See comments in
3050spool_in.c, where the same locking is done. */
3051
3052data_file = fdopen(data_fd, "w+");
3053lock_data.l_type = F_WRLCK;
3054lock_data.l_whence = SEEK_SET;
3055lock_data.l_start = 0;
3056lock_data.l_len = SPOOL_DATA_START_OFFSET;
3057
3058if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3059 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3060 errno, strerror(errno));
3061
3062/* We have an open, locked data file. Write the message id to it to make it
3063self-identifying. Then read the remainder of the input of this message and
3064write it to the data file. If the variable next != NULL, it contains the first
3065data line (which was read as a header but then turned out not to have the right
3066format); write it (remembering that it might contain binary zeros). The result
3067of fwrite() isn't inspected; instead we call ferror() below. */
3068
3069fprintf(data_file, "%s-D\n", message_id);
306c6c77 3070if (next)
059ec3d9
PH
3071 {
3072 uschar *s = next->text;
3073 int len = next->slen;
1ac6b2e7 3074 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
059ec3d9
PH
3075 body_linecount++; /* Assumes only 1 line */
3076 }
3077
3078/* Note that we might already be at end of file, or the logical end of file
3079(indicated by '.'), or might have encountered an error while writing the
3080message id or "next" line. */
3081
3082if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3083 {
3084 if (smtp_input)
3085 {
328c5688
JH
3086 message_ended = chunking_state <= CHUNKING_OFFERED
3087 ? read_message_data_smtp(data_file)
3088 : spool_wireformat
3089 ? read_message_bdat_smtp_wire(data_file)
3090 : read_message_bdat_smtp(data_file);
059ec3d9
PH
3091 receive_linecount++; /* The terminating "." line */
3092 }
3093 else message_ended = read_message_data(data_file);
3094
3095 receive_linecount += body_linecount; /* For BSMTP errors mainly */
2e0c1448 3096 message_linecount += body_linecount;
059ec3d9 3097
7e3ce68e 3098 switch (message_ended)
059ec3d9 3099 {
7e3ce68e 3100 /* Handle premature termination of SMTP */
059ec3d9 3101
7e3ce68e
JH
3102 case END_EOF:
3103 if (smtp_input)
3104 {
3105 Uunlink(spool_name); /* Lose data file when closed */
57cc2785 3106 cancel_cutthrough_connection(TRUE, US"sender closed connection");
7e3ce68e
JH
3107 message_id[0] = 0; /* Indicate no message accepted */
3108 smtp_reply = handle_lost_connection(US"");
3109 smtp_yield = FALSE;
3110 goto TIDYUP; /* Skip to end of function */
3111 }
3112 break;
059ec3d9 3113
7e3ce68e
JH
3114 /* Handle message that is too big. Don't use host_or_ident() in the log
3115 message; we want to see the ident value even for non-remote messages. */
059ec3d9 3116
7e3ce68e
JH
3117 case END_SIZE:
3118 Uunlink(spool_name); /* Lose the data file when closed */
57cc2785 3119 cancel_cutthrough_connection(TRUE, US"mail too big");
7e3ce68e 3120 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
059ec3d9 3121
7e3ce68e
JH
3122 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3123 "message too big: read=%d max=%d",
3124 sender_address,
306c6c77
JH
3125 sender_fullhost ? " H=" : "",
3126 sender_fullhost ? sender_fullhost : US"",
3127 sender_ident ? " U=" : "",
3128 sender_ident ? sender_ident : US"",
7e3ce68e
JH
3129 message_size,
3130 thismessage_size_limit);
3131
3132 if (smtp_input)
3133 {
3134 smtp_reply = US"552 Message size exceeds maximum permitted";
3135 message_id[0] = 0; /* Indicate no message accepted */
3136 goto TIDYUP; /* Skip to end of function */
3137 }
3138 else
3139 {
3140 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3141 give_local_error(ERRMESS_TOOBIG,
3142 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3143 US"message rejected: ", error_rc, data_file, header_list);
3144 /* Does not return */
3145 }
3146 break;
3147
3148 /* Handle bad BDAT protocol sequence */
3149
3150 case END_PROTOCOL:
3151 Uunlink(spool_name); /* Lose the data file when closed */
57cc2785 3152 cancel_cutthrough_connection(TRUE, US"sender protocol error");
7e3ce68e
JH
3153 smtp_reply = US""; /* Response already sent */
3154 message_id[0] = 0; /* Indicate no message accepted */
3155 goto TIDYUP; /* Skip to end of function */
059ec3d9
PH
3156 }
3157 }
3158
3159/* Restore the standard SIGALRM handler for any subsequent processing. (For
3160example, there may be some expansion in an ACL that uses a timer.) */
3161
3162os_non_restarting_signal(SIGALRM, sigalrm_handler);
3163
3164/* The message body has now been read into the data file. Call fflush() to
3165empty the buffers in C, and then call fsync() to get the data written out onto
3166the disk, as fflush() doesn't do this (or at least, it isn't documented as
3167having to do this). If there was an I/O error on either input or output,
3168attempt to send an error message, and unlink the spool file. For non-SMTP input
3169we can then give up. Note that for SMTP input we must swallow the remainder of
3170the input in cases of output errors, since the far end doesn't expect to see
3171anything until the terminating dot line is sent. */
3172
3173if (fflush(data_file) == EOF || ferror(data_file) ||
54fc8428 3174 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
059ec3d9
PH
3175 {
3176 uschar *msg_errno = US strerror(errno);
3177 BOOL input_error = (receive_ferror)() != 0;
3178 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3179 input_error? "Input read" : "Spool write",
3180 msg_errno,
306c6c77 3181 sender_fullhost ? sender_fullhost : sender_ident);
059ec3d9
PH
3182
3183 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3184 Uunlink(spool_name); /* Lose the data file */
57cc2785 3185 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
059ec3d9
PH
3186
3187 if (smtp_input)
3188 {
3189 if (input_error)
3190 smtp_reply = US"451 Error while reading input data";
3191 else
3192 {
3193 smtp_reply = US"451 Error while writing spool file";
3194 receive_swallow_smtp();
3195 }
3196 message_id[0] = 0; /* Indicate no message accepted */
3197 goto TIDYUP; /* Skip to end of function */
3198 }
3199
3200 else
3201 {
3202 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3203 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3204 header_list);
3205 /* Does not return */
3206 }
3207 }
3208
3209
3210/* No I/O errors were encountered while writing the data file. */
3211
3212DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
306c6c77 3213if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
059ec3d9
PH
3214
3215
3216/* If there were any bad addresses extracted by -t, or there were no recipients
3217left after -t, send a message to the sender of this message, or write it to
3218stderr if the error handling option is set that way. Note that there may
3219legitimately be no recipients for an SMTP message if they have all been removed
3220by "discard".
3221
3222We need to rewind the data file in order to read it. In the case of no
3223recipients or stderr error writing, throw the data file away afterwards, and
3224exit. (This can't be SMTP, which always ensures there's at least one
3225syntactically good recipient address.) */
3226
306c6c77 3227if (extract_recip && (bad_addresses || recipients_count == 0))
059ec3d9
PH
3228 {
3229 DEBUG(D_receive)
3230 {
3231 if (recipients_count == 0) debug_printf("*** No recipients\n");
306c6c77 3232 if (bad_addresses)
059ec3d9
PH
3233 {
3234 error_block *eblock = bad_addresses;
3235 debug_printf("*** Bad address(es)\n");
3236 while (eblock != NULL)
3237 {
3238 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3239 eblock = eblock->next;
3240 }
3241 }
3242 }
3243
3244 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3245
3246 /* If configured to send errors to the sender, but this fails, force
3247 a failure error code. We use a special one for no recipients so that it
3248 can be detected by the autoreply transport. Otherwise error_rc is set to
3249 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3250 it is EXIT_SUCCESS. */
3251
3252 if (error_handling == ERRORS_SENDER)
3253 {
3254 if (!moan_to_sender(
3255 (bad_addresses == NULL)?
3256 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3257 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3258 bad_addresses, header_list, data_file, FALSE))
3259 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3260 }
3261 else
3262 {
306c6c77 3263 if (!bad_addresses)
059ec3d9
PH
3264 {
3265 if (extracted_ignored)
3266 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3267 else
3268 fprintf(stderr, "exim: no recipients in message\n");
3269 }
3270 else
3271 {
3272 fprintf(stderr, "exim: invalid address%s",
3273 (bad_addresses->next == NULL)? ":" : "es:\n");
3274 while (bad_addresses != NULL)
3275 {
3276 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3277 bad_addresses->text2);
3278 bad_addresses = bad_addresses->next;
3279 }
3280 }
3281 }
3282
3283 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3284 {
3285 Uunlink(spool_name);
f1e894f3 3286 (void)fclose(data_file);
9bfb7e1b 3287 exim_exit(error_rc, US"receiving");
059ec3d9
PH
3288 }
3289 }
3290
3291/* Data file successfully written. Generate text for the Received: header by
3292expanding the configured string, and adding a timestamp. By leaving this
3293operation till now, we ensure that the timestamp is the time that message
3294reception was completed. However, this is deliberately done before calling the
3295data ACL and local_scan().
3296
3297This Received: header may therefore be inspected by the data ACL and by code in
3298the local_scan() function. When they have run, we update the timestamp to be
3299the final time of reception.
3300
3301If there is just one recipient, set up its value in the $received_for variable
3302for use when we generate the Received: header.
3303
3304Note: the checking for too many Received: headers is handled by the delivery
3305code. */
e4bdf652 3306/*XXX eventually add excess Received: check for cutthrough case back when classifying them */
059ec3d9 3307
306c6c77 3308if (!received_header->text) /* Non-cutthrough case */
059ec3d9 3309 {
e4bdf652 3310 received_header_gen();
059ec3d9 3311
e4bdf652 3312 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
059ec3d9 3313
e4bdf652
JH
3314 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3315 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
059ec3d9 3316
e4bdf652
JH
3317 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3318 now, before running the DATA ACL. */
059ec3d9 3319
578d43dc 3320 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
e4bdf652 3321 }
817d9f57 3322else
e4bdf652
JH
3323 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3324 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
059ec3d9
PH
3325
3326/* If an ACL is specified for checking things at this stage of reception of a
3327message, run it, unless all the recipients were removed by "discard" in earlier
3328ACLs. That is the only case in which recipients_count can be zero at this
3329stage. Set deliver_datafile to point to the data file so that $message_body and
3330$message_body_end can be extracted if needed. Allow $recipients in expansions.
3331*/
3332
3333deliver_datafile = data_fd;
4e88a19f 3334user_msg = NULL;
059ec3d9 3335
0e20aff9
MH
3336enable_dollar_recipients = TRUE;
3337
059ec3d9 3338if (recipients_count == 0)
7e3ce68e
JH
3339 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3340
059ec3d9
PH
3341else
3342 {
059ec3d9
PH
3343 /* Handle interactive SMTP messages */
3344
3345 if (smtp_input && !smtp_batched_input)
3346 {
8523533c 3347
80a47a2c
TK
3348#ifndef DISABLE_DKIM
3349 if (!dkim_disable_verify)
3350 {
cc55f420 3351 /* Finish verification */
80a47a2c
TK
3352 dkim_exim_verify_finish();
3353
3354 /* Check if we must run the DKIM ACL */
7e3ce68e 3355 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
80a47a2c 3356 {
cc55f420 3357 uschar * dkim_verify_signers_expanded =
80a47a2c 3358 expand_string(dkim_verify_signers);
cc55f420
JH
3359 gstring * results = NULL;
3360 int signer_sep = 0;
3361 const uschar * ptr;
3362 uschar * item;
3363 gstring * seen_items = NULL;
3364 int old_pool = store_pool;
3365
3366 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3367
3368 if (!(ptr = dkim_verify_signers_expanded))
80a47a2c
TK
3369 log_write(0, LOG_MAIN|LOG_PANIC,
3370 "expansion of dkim_verify_signers option failed: %s",
3371 expand_string_message);
7e3ce68e 3372
cc55f420
JH
3373 /* Default to OK when no items are present */
3374 rc = OK;
3375 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3376 {
3377 /* Prevent running ACL for an empty item */
3378 if (!item || !*item) continue;
3379
3380 /* Only run ACL once for each domain or identity,
3381 no matter how often it appears in the expanded list. */
3382 if (seen_items)
3383 {
3384 uschar * seen_item;
3385 const uschar * seen_items_list = string_from_gstring(seen_items);
3386 int seen_sep = ':';
3387 BOOL seen_this_item = FALSE;
3388
3389 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3390 NULL, 0)))
3391 if (Ustrcmp(seen_item,item) == 0)
3392 {
3393 seen_this_item = TRUE;
3394 break;
3395 }
3396
3397 if (seen_this_item)
5032d1cf
JH
3398 {
3399 DEBUG(D_receive)
cc55f420
JH
3400 debug_printf("acl_smtp_dkim: skipping signer %s, "
3401 "already seen\n", item);
3402 continue;
5032d1cf 3403 }
cc55f420 3404
b2bcdd35 3405 seen_items = string_catn(seen_items, US":", 1);
cc55f420 3406 }
cc55f420
JH
3407 seen_items = string_cat(seen_items, item);
3408
18067c75 3409 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
cc55f420
JH
3410 if (rc != OK)
3411 {
3412 DEBUG(D_receive)
3413 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3414 "skipping remaining items\n", rc, item);
3415 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3416 break;
3417 }
3418 }
3419 dkim_verify_status = string_from_gstring(results);
3420 store_pool = old_pool;
3421 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3422 if (rc == DISCARD)
3423 {
3424 recipients_count = 0;
3425 blackholed_by = US"DKIM ACL";
3426 if (log_msg)
3427 blackhole_log_msg = string_sprintf(": %s", log_msg);
3428 }
3429 else if (rc != OK)
3430 {
3431 Uunlink(spool_name);
3432 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3433 smtp_yield = FALSE; /* No more messages after dropped connection */
3434 smtp_reply = US""; /* Indicate reply already sent */
3435 message_id[0] = 0; /* Indicate no message accepted */
3436 goto TIDYUP; /* Skip to end of function */
3437 }
80a47a2c 3438 }
a79d8834
JH
3439 else
3440 dkim_exim_verify_log_all();
80a47a2c 3441 }
4a8ce2d8 3442#endif /* DISABLE_DKIM */
fb2274d4 3443
8523533c 3444#ifdef WITH_CONTENT_SCAN
5b6f7658
JH
3445 if ( recipients_count > 0
3446 && acl_smtp_mime
3447 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3448 )
54cdb463 3449 goto TIDYUP;
8523533c
TK
3450#endif /* WITH_CONTENT_SCAN */
3451
4840604e
TL
3452#ifdef EXPERIMENTAL_DMARC
3453 dmarc_up = dmarc_store_data(from_header);
3454#endif /* EXPERIMENTAL_DMARC */
3455
8ccd00b1
JH
3456#ifndef DISABLE_PRDR
3457 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
fd98a5c6
JH
3458 {
3459 unsigned int c;
3460 int all_pass = OK;
3461 int all_fail = FAIL;
3462
925ac8e4 3463 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
fd98a5c6
JH
3464 /* Loop through recipients, responses must be in same order received */
3465 for (c = 0; recipients_count > c; c++)
3466 {
3467 uschar * addr= recipients_list[c].address;
3468 uschar * msg= US"PRDR R=<%s> %s";
3469 uschar * code;
3470 DEBUG(D_receive)
3471 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3472 addr, c+1, recipients_count);
3473 rc = acl_check(ACL_WHERE_PRDR, addr,
3474 acl_smtp_data_prdr, &user_msg, &log_msg);
3475
3476 /* If any recipient rejected content, indicate it in final message */
3477 all_pass |= rc;
3478 /* If all recipients rejected, indicate in final message */
3479 all_fail &= rc;
3480
3481 switch (rc)
3482 {
3483 case OK: case DISCARD: code = US"250"; break;
3484 case DEFER: code = US"450"; break;
3485 default: code = US"550"; break;
3486 }
3487 if (user_msg != NULL)
3488 smtp_user_msg(code, user_msg);
3489 else
3490 {
3491 switch (rc)
3492 {
3493 case OK: case DISCARD:
3494 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3495 case DEFER:
3496 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3497 default:
3498 msg = string_sprintf(CS msg, addr, "refusal"); break;
3499 }
3500 smtp_user_msg(code, msg);
3501 }
3502 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3503 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
112b6a93 3504 else log_write(0, LOG_MAIN, "%s", CS msg);
fd98a5c6
JH
3505
3506 if (rc != OK) { receive_remove_recipient(addr); c--; }
3507 }
3508 /* Set up final message, used if data acl gives OK */
3509 smtp_reply = string_sprintf("%s id=%s message %s",
3510 all_fail == FAIL ? US"550" : US"250",
3511 message_id,
3512 all_fail == FAIL
3513 ? US"rejected for all recipients"
3514 : all_pass == OK
3515 ? US"accepted"
3516 : US"accepted for some recipients");
3517 if (recipients_count == 0)
3518 {
3519 message_id[0] = 0; /* Indicate no message accepted */
3520 goto TIDYUP;
3521 }
3522 }
3523 else
3524 prdr_requested = FALSE;
8ccd00b1 3525#endif /* !DISABLE_PRDR */
fd98a5c6 3526
54cdb463
PH
3527 /* Check the recipients count again, as the MIME ACL might have changed
3528 them. */
8523533c 3529
059ec3d9
PH
3530 if (acl_smtp_data != NULL && recipients_count > 0)
3531 {
059ec3d9 3532 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
578d43dc 3533 add_acl_headers(ACL_WHERE_DATA, US"DATA");
059ec3d9
PH
3534 if (rc == DISCARD)
3535 {
3536 recipients_count = 0;
3537 blackholed_by = US"DATA ACL";
57cc2785 3538 if (log_msg)
8e669ac1 3539 blackhole_log_msg = string_sprintf(": %s", log_msg);
57cc2785 3540 cancel_cutthrough_connection(TRUE, US"data acl discard");
059ec3d9
PH
3541 }
3542 else if (rc != OK)
3543 {
3544 Uunlink(spool_name);
57cc2785 3545 cancel_cutthrough_connection(TRUE, US"data acl not ok");
8523533c
TK
3546#ifdef WITH_CONTENT_SCAN
3547 unspool_mbox();
3548#endif
6f0c431a
PP
3549#ifdef EXPERIMENTAL_DCC
3550 dcc_ok = 0;
3551#endif
059ec3d9 3552 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
85ffcba6 3553 smtp_yield = FALSE; /* No more messages after dropped connection */
059ec3d9
PH
3554 smtp_reply = US""; /* Indicate reply already sent */
3555 message_id[0] = 0; /* Indicate no message accepted */
3556 goto TIDYUP; /* Skip to end of function */
3557 }
3558 }
3559 }
3560
3561 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3562 we cannot take different actions for permanent and temporary rejections. */
3563
54cdb463 3564 else
059ec3d9 3565 {
54cdb463
PH
3566
3567#ifdef WITH_CONTENT_SCAN
5b6f7658
JH
3568 if ( acl_not_smtp_mime
3569 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3570 &blackholed_by)
3571 )
54cdb463
PH
3572 goto TIDYUP;
3573#endif /* WITH_CONTENT_SCAN */
3574
3575 if (acl_not_smtp != NULL)
059ec3d9 3576 {
54cdb463
PH
3577 uschar *user_msg, *log_msg;
3578 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3579 if (rc == DISCARD)
059ec3d9 3580 {
54cdb463
PH
3581 recipients_count = 0;
3582 blackholed_by = US"non-SMTP ACL";
3583 if (log_msg != NULL)
3584 blackhole_log_msg = string_sprintf(": %s", log_msg);
059ec3d9 3585 }
54cdb463 3586 else if (rc != OK)
059ec3d9 3587 {
54cdb463
PH
3588 Uunlink(spool_name);
3589#ifdef WITH_CONTENT_SCAN
3590 unspool_mbox();
3591#endif
6f0c431a
PP
3592#ifdef EXPERIMENTAL_DCC
3593 dcc_ok = 0;
3594#endif
6ea85e9a
PH
3595 /* The ACL can specify where rejections are to be logged, possibly
3596 nowhere. The default is main and reject logs. */
3597
3598 if (log_reject_target != 0)
3599 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3600 sender_address, log_msg);
3601
54cdb463
PH
3602 if (user_msg == NULL) user_msg = US"local configuration problem";
3603 if (smtp_batched_input)
3604 {
3605 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3606 /* Does not return */
3607 }
3608 else
3609 {
3610 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3611 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3612 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3613 header_list);
3614 /* Does not return */
3615 }
059ec3d9 3616 }
578d43dc 3617 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
059ec3d9 3618 }
059ec3d9
PH
3619 }
3620