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1/* $Cambridge: exim/src/src/exim.c,v 1.1 2004/10/07 10:39:01 ph10 Exp $ */
2
3/*************************************************
4* Exim - an Internet mail transport agent *
5*************************************************/
6
7/* Copyright (c) University of Cambridge 1995 - 2004 */
8/* See the file NOTICE for conditions of use and distribution. */
9
10
11/* The main function: entry point, initialization, and high-level control.
12Also a few functions that don't naturally fit elsewhere. */
13
14
15#include "exim.h"
16
17
18
19/*************************************************
20* Function interface to store functions *
21*************************************************/
22
23/* We need some real functions to pass to the PCRE regular expression library
24for store allocation via Exim's store manager. The normal calls are actually
25macros that pass over location information to make tracing easier. These
26functions just interface to the standard macro calls. A good compiler will
27optimize out the tail recursion and so not make them too expensive. There
28are two sets of functions; one for use when we want to retain the compiled
29regular expression for a long time; the other for short-term use. */
30
31static void *
32function_store_get(size_t size)
33{
34return store_get((int)size);
35}
36
37static void
38function_dummy_free(void *block) { block = block; }
39
40static void *
41function_store_malloc(size_t size)
42{
43return store_malloc((int)size);
44}
45
46static void
47function_store_free(void *block)
48{
49store_free(block);
50}
51
52
53
54
55/*************************************************
56* Compile regular expression and panic on fail *
57*************************************************/
58
59/* This function is called when failure to compile a regular expression leads
60to a panic exit. In other cases, pcre_compile() is called directly. In many
61cases where this function is used, the results of the compilation are to be
62placed in long-lived store, so we temporarily reset the store management
63functions that PCRE uses if the use_malloc flag is set.
64
65Argument:
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
69
70Returns: pointer to the compiled pattern
71*/
72
73const pcre *
74regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
75{
76int offset;
77int options = PCRE_COPT;
78const pcre *yield;
79const uschar *error;
80if (use_malloc)
81 {
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
84 }
85if (caseless) options |= PCRE_CASELESS;
86yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87pcre_malloc = function_store_get;
88pcre_free = function_dummy_free;
89if (yield == NULL)
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
92return yield;
93}
94
95
96
97
98/*************************************************
99* Execute regular expression and set strings *
100*************************************************/
101
102/* This function runs a regular expression match, and sets up the pointers to
103the matched substrings.
104
105Arguments:
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
112
113Returns: TRUE or FALSE
114*/
115
116BOOL
117regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
118{
119int ovector[3*(EXPAND_MAXN+1)];
120int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
122BOOL yield = n >= 0;
123if (n == 0) n = EXPAND_MAXN + 1;
124if (yield)
125 {
126 int nn;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
129 {
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
132 }
133 expand_nmax--;
134 }
135return yield;
136}
137
138
139
140
141/*************************************************
142* Handler for SIGUSR1 *
143*************************************************/
144
145/* SIGUSR1 causes any exim process to write to the process log details of
146what it is currently doing. It will only be used if the OS is capable of
147setting up a handler that causes automatic restarting of any system call
148that is in progress at the time.
149
150Argument: the signal number (SIGUSR1)
151Returns: nothing
152*/
153
154static void
155usr1_handler(int sig)
156{
157sig = sig; /* Keep picky compilers happy */
158log_write(0, LOG_PROCESS, "%s", process_info);
159log_close_all();
160os_restarting_signal(SIGUSR1, usr1_handler);
161}
162
163
164
165/*************************************************
166* Timeout handler *
167*************************************************/
168
169/* This handler is enabled most of the time that Exim is running. The handler
170doesn't actually get used unless alarm() has been called to set a timer, to
171place a time limit on a system call of some kind. When the handler is run, it
172re-enables itself.
173
174There are some other SIGALRM handlers that are used in special cases when more
175than just a flag setting is required; for example, when reading a message's
176input. These are normally set up in the code module that uses them, and the
177SIGALRM handler is reset to this one afterwards.
178
179Argument: the signal value (SIGALRM)
180Returns: nothing
181*/
182
183void
184sigalrm_handler(int sig)
185{
186sig = sig; /* Keep picky compilers happy */
187sigalrm_seen = TRUE;
188os_non_restarting_signal(SIGALRM, sigalrm_handler);
189}
190
191
192
193/*************************************************
194* Sleep for a fractional time interval *
195*************************************************/
196
197/* This function is called by millisleep() and exim_wait_tick() to wait for a
198period of time that may include a fraction of a second. The coding is somewhat
199tedious...
200
201Argument: an itimerval structure containing the interval
202Returns: nothing
203*/
204
205static void
206milliwait(struct itimerval *itval)
207{
208sigset_t sigmask;
209sigset_t old_sigmask;
210(void)sigemptyset(&sigmask); /* Empty mask */
211(void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
212(void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
213(void)setitimer(ITIMER_REAL, itval, NULL); /* Start timer */
214(void)sigfillset(&sigmask); /* All signals */
215(void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
216(void)sigsuspend(&sigmask); /* Until SIGALRM */
217(void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
218}
219
220
221
222
223/*************************************************
224* Millisecond sleep function *
225*************************************************/
226
227/* The basic sleep() function has a granularity of 1 second, which is too rough
228in some cases - for example, when using an increasing delay to slow down
229spammers.
230
231Argument: number of millseconds
232Returns: nothing
233*/
234
235void
236millisleep(int msec)
237{
238struct itimerval itval;
239itval.it_interval.tv_sec = 0;
240itval.it_interval.tv_usec = 0;
241itval.it_value.tv_sec = msec/1000;
242itval.it_value.tv_usec = (msec % 1000) * 1000;
243milliwait(&itval);
244}
245
246
247
248/*************************************************
249* Compare microsecond times *
250*************************************************/
251
252/*
253Arguments:
254 tv1 the first time
255 tv2 the second time
256
257Returns: -1, 0, or +1
258*/
259
260int
261exim_tvcmp(struct timeval *t1, struct timeval *t2)
262{
263if (t1->tv_sec > t2->tv_sec) return +1;
264if (t1->tv_sec < t2->tv_sec) return -1;
265if (t1->tv_usec > t2->tv_usec) return +1;
266if (t1->tv_usec < t2->tv_usec) return -1;
267return 0;
268}
269
270
271
272
273/*************************************************
274* Clock tick wait function *
275*************************************************/
276
277/* Exim uses a time + a pid to generate a unique identifier in two places: its
278message IDs, and in file names for maildir deliveries. Because some OS now
279re-use pids within the same second, sub-second times are now being used.
280However, for absolute certaintly, we must ensure the clock has ticked before
281allowing the relevant process to complete. At the time of implementation of
282this code (February 2003), the speed of processors is such that the clock will
283invariably have ticked already by the time a process has done its job. This
284function prepares for the time when things are faster - and it also copes with
285clocks that go backwards.
286
287Arguments:
288 then_tv A timeval which was used to create uniqueness; its usec field
289 has been rounded down to the value of the resolution.
290 We want to be sure the current time is greater than this.
291 resolution The resolution that was used to divide the microseconds
292 (1 for maildir, larger for message ids)
293
294Returns: nothing
295*/
296
297void
298exim_wait_tick(struct timeval *then_tv, int resolution)
299{
300struct timeval now_tv;
301long int now_true_usec;
302
303(void)gettimeofday(&now_tv, NULL);
304now_true_usec = now_tv.tv_usec;
305now_tv.tv_usec = (now_true_usec/resolution) * resolution;
306
307if (exim_tvcmp(&now_tv, then_tv) <= 0)
308 {
309 struct itimerval itval;
310 itval.it_interval.tv_sec = 0;
311 itval.it_interval.tv_usec = 0;
312 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
313 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
314
315 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
316 negative value for the microseconds is possible only in the case when "now"
317 is more than a second less than "then". That means that itval.it_value.tv_sec
318 is greater than zero. The following correction is therefore safe. */
319
320 if (itval.it_value.tv_usec < 0)
321 {
322 itval.it_value.tv_usec += 1000000;
323 itval.it_value.tv_sec -= 1;
324 }
325
326 DEBUG(D_transport|D_receive)
327 {
328 if (!running_in_test_harness)
329 {
330 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
331 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
332 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
333 itval.it_value.tv_usec);
334 }
335 }
336
337 milliwait(&itval);
338 }
339}
340
341
342
343
344/*************************************************
345* Set up processing details *
346*************************************************/
347
348/* Save a text string for dumping when SIGUSR1 is received.
349Do checks for overruns.
350
351Arguments: format and arguments, as for printf()
352Returns: nothing
353*/
354
355void
356set_process_info(char *format, ...)
357{
358int len;
359va_list ap;
360sprintf(CS process_info, "%5d ", (int)getpid());
361len = Ustrlen(process_info);
362va_start(ap, format);
363if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
364 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
365DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
366va_end(ap);
367}
368
369
370
371
372
373/*************************************************
374* Ensure stdin, stdout, and stderr exist *
375*************************************************/
376
377/* Some operating systems grumble if an exec() happens without a standard
378input, output, and error (fds 0, 1, 2) being defined. The worry is that some
379file will be opened and will use these fd values, and then some other bit of
380code will assume, for example, that it can write error messages to stderr.
381This function ensures that fds 0, 1, and 2 are open if they do not already
382exist, by connecting them to /dev/null.
383
384This function is also used to ensure that std{in,out,err} exist at all times,
385so that if any library that Exim calls tries to use them, it doesn't crash.
386
387Arguments: None
388Returns: Nothing
389*/
390
391void
392exim_nullstd(void)
393{
394int i;
395int devnull = -1;
396struct stat statbuf;
397for (i = 0; i <= 2; i++)
398 {
399 if (fstat(i, &statbuf) < 0 && errno == EBADF)
400 {
401 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
402 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
403 string_open_failed(errno, "/dev/null"));
404 if (devnull != i) dup2(devnull, i);
405 }
406 }
407if (devnull > 2) close(devnull);
408}
409
410
411
412
413/*************************************************
414* Close unwanted file descriptors for delivery *
415*************************************************/
416
417/* This function is called from a new process that has been forked to deliver
418an incoming message, either directly, or using exec.
419
420We want any smtp input streams to be closed in this new process. However, it
421has been observed that using fclose() here causes trouble. When reading in -bS
422input, duplicate copies of messages have been seen. The files will be sharing a
423file pointer with the parent process, and it seems that fclose() (at least on
424some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
425least sometimes. Hence we go for closing the underlying file descriptors.
426
427If TLS is active, we want to shut down the TLS library, but without molesting
428the parent's SSL connection.
429
430For delivery of a non-SMTP message, we want to close stdin and stdout (and
431stderr unless debugging) because the calling process might have set them up as
432pipes and be waiting for them to close before it waits for the submission
433process to terminate. If they aren't closed, they hold up the calling process
434until the initial delivery process finishes, which is not what we want.
435
436Exception: We do want it for synchronous delivery!
437
438And notwithstanding all the above, if D_resolver is set, implying resolver
439debugging, leave stdout open, because that's where the resolver writes its
440debugging output.
441
442When we close stderr (which implies we've also closed stdout), we also get rid
443of any controlling terminal.
444
445Arguments: None
446Returns: Nothing
447*/
448
449static void
450close_unwanted(void)
451{
452if (smtp_input)
453 {
454 #ifdef SUPPORT_TLS
455 tls_close(FALSE); /* Shut down the TLS library */
456 #endif
457 close(fileno(smtp_in));
458 close(fileno(smtp_out));
459 smtp_in = NULL;
460 }
461else
462 {
463 close(0); /* stdin */
464 if ((debug_selector & D_resolver) == 0) close(1); /* stdout */
465 if (debug_selector == 0) /* stderr */
466 {
467 if (!synchronous_delivery)
468 {
469 close(2);
470 log_stderr = NULL;
471 }
472 (void)setsid();
473 }
474 }
475}
476
477
478
479
480/*************************************************
481* Set uid and gid *
482*************************************************/
483
484/* This function sets a new uid and gid permanently, optionally calling
485initgroups() to set auxiliary groups. There are some special cases when running
486Exim in unprivileged modes. In these situations the effective uid will not be
487root; if we already have the right effective uid/gid, and don't need to
488initialize any groups, leave things as they are.
489
490Arguments:
491 uid the uid
492 gid the gid
493 igflag TRUE if initgroups() wanted
494 msg text to use in debugging output and failure log
495
496Returns: nothing; bombs out on failure
497*/
498
499void
500exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
501{
502uid_t euid = geteuid();
503gid_t egid = getegid();
504
505if (euid == root_uid || euid != uid || egid != gid || igflag)
506 {
507 /* At least one OS returns +1 for initgroups failure, so just check for
508 non-zero. */
509
510 if (igflag)
511 {
512 struct passwd *pw = getpwuid(uid);
513 if (pw != NULL)
514 {
515 if (initgroups(pw->pw_name, gid) != 0)
516 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
517 (long int)uid, strerror(errno));
518 }
519 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
520 "no passwd entry for uid=%ld", (long int)uid);
521 }
522
523 if (setgid(gid) < 0 || setuid(uid) < 0)
524 {
525 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
526 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
527 }
528 }
529
530/* Debugging output included uid/gid and all groups */
531
532DEBUG(D_uid)
533 {
534 int group_count;
535 gid_t group_list[NGROUPS_MAX];
536 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
537 (long int)geteuid(), (long int)getegid(), (long int)getpid());
538 group_count = getgroups(NGROUPS_MAX, group_list);
539 debug_printf(" auxiliary group list:");
540 if (group_count > 0)
541 {
542 int i;
543 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
544 }
545 else debug_printf(" <none>");
546 debug_printf("\n");
547 }
548}
549
550
551
552
553/*************************************************
554* Exit point *
555*************************************************/
556
557/* Exim exits via this function so that it always clears up any open
558databases.
559
560Arguments:
561 rc return code
562
563Returns: does not return
564*/
565
566void
567exim_exit(int rc)
568{
569search_tidyup();
570DEBUG(D_any)
571 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
572 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
573exit(rc);
574}
575
576
577
578
579/*************************************************
580* Extract port from host address *
581*************************************************/
582
583/* Called to extract the port from the values given to -oMa and -oMi.
584It also checks the syntax of the address.
585
586Argument:
587 address the address, with possible port on the end
588
589Returns: the port, or zero if there isn't one
590 bombs out on a syntax error
591*/
592
593static int
594check_port(uschar *address)
595{
596int port = host_extract_port(address);
597if (!string_is_ip_address(address, NULL))
598 {
599 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
600 exit(EXIT_FAILURE);
601 }
602return port;
603}
604
605
606
607/*************************************************
608* Test/verify an address *
609*************************************************/
610
611/* This function is called by the -bv and -bt code. It extracts a working
612address from a full RFC 822 address. This isn't really necessary per se, but it
613has the effect of collapsing source routes.
614
615Arguments:
616 s the address string
617 flags flag bits for verify_address()
618 exit_value to be set for failures
619
620Returns: nothint
621*/
622
623static void
624test_address(uschar *s, int flags, int *exit_value)
625{
626int start, end, domain;
627uschar *parse_error = NULL;
628uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
629 FALSE);
630if (address == NULL)
631 {
632 fprintf(stdout, "syntax error: %s\n", parse_error);
633 *exit_value = 2;
634 }
635else
636 {
637 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
638 -1, NULL, NULL, NULL);
639 if (rc == FAIL) *exit_value = 2;
640 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
641 }
642}
643
644
645
646/*************************************************
647* Decode bit settings for log/debug *
648*************************************************/
649
650/* This function decodes a string containing bit settings in the form of +name
651and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
652also recognizes a numeric setting of the form =<number>, but this is not
653intended for user use. It's an easy way for Exim to pass the debug settings
654when it is re-exec'ed.
655
656The log options are held in two unsigned ints (because there became too many
657for one). The top bit in the table means "put in 2nd selector". This does not
658yet apply to debug options, so the "=" facility sets only the first selector.
659
660A bad value for a debug setting is treated as an unknown option - error message
661to stderr and die. For log settings, which come from the configuration file,
662we write to the log on the way out...
663
664Arguments:
665 selector1 address of the first bit string
666 selector2 address of the second bit string, or NULL
667 string the configured string
668 options the table of option names
669 count size of table
670 which "log" or "debug"
671
672Returns: nothing on success - bomb out on failure
673*/
674
675static void
676decode_bits(unsigned int *selector1, unsigned int *selector2, uschar *string,
677 bit_table *options, int count, uschar *which)
678{
679uschar *errmsg;
680if (string == NULL) return;
681
682if (*string == '=')
683 {
684 char *end; /* Not uschar */
685 *selector1 = strtoul(CS string+1, &end, 0);
686 if (*end == 0) return;
687 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
688 string);
689 goto ERROR_RETURN;
690 }
691
692/* Handle symbolic setting */
693
694else for(;;)
695 {
696 BOOL adding;
697 uschar *s;
698 int len;
699 bit_table *start, *end;
700
701 while (isspace(*string)) string++;
702 if (*string == 0) return;
703
704 if (*string != '+' && *string != '-')
705 {
706 errmsg = string_sprintf("malformed %s_selector setting: "
707 "+ or - expected but found \"%s\"", which, string);
708 goto ERROR_RETURN;
709 }
710
711 adding = *string++ == '+';
712 s = string;
713 while (isalnum(*string) || *string == '_') string++;
714 len = string - s;
715
716 start = options;
717 end = options + count;
718
719 while (start < end)
720 {
721 bit_table *middle = start + (end - start)/2;
722 int c = Ustrncmp(s, middle->name, len);
723 if (c == 0)
724 {
725 if (middle->name[len] != 0) c = -1; else
726 {
727 unsigned int bit = middle->bit;
728 unsigned int *selector;
729
730 /* The value with all bits set means "set all bits in both selectors"
731 in the case where two are being handled. However, the top bit in the
732 second selector is never set. */
733
734 if (bit == 0xffffffff)
735 {
736 *selector1 = adding? bit : 0;
737 if (selector2 != NULL) *selector2 = adding? 0x7fffffff : 0;
738 }
739
740 /* Otherwise, the 0x80000000 bit means "this value, without the top
741 bit, belongs in the second selector". */
742
743 else
744 {
745 if ((bit & 0x80000000) != 0)
746 {
747 selector = selector2;
748 bit &= 0x7fffffff;
749 }
750 else selector = selector1;
751 if (adding) *selector |= bit; else *selector &= ~bit;
752 }
753 break; /* Out of loop to match selector name */
754 }
755 }
756 if (c < 0) end = middle; else start = middle + 1;
757 } /* Loop to match selector name */
758
759 if (start >= end)
760 {
761 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
762 adding? '+' : '-', len, s);
763 goto ERROR_RETURN;
764 }
765 } /* Loop for selector names */
766
767/* Handle disasters */
768
769ERROR_RETURN:
770if (Ustrcmp(which, "debug") == 0)
771 {
772 fprintf(stderr, "exim: %s\n", errmsg);
773 exit(EXIT_FAILURE);
774 }
775else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
776}
777
778
779
780/*************************************************
781* Show supported features *
782*************************************************/
783
784/* This function is called for -bV and for -d to output the optional features
785of the current Exim binary.
786
787Arguments: a FILE for printing
788Returns: nothing
789*/
790
791static void
792show_whats_supported(FILE *f)
793{
794#ifdef DB_VERSION_STRING
795fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
796#elif defined(BTREEVERSION) && defined(HASHVERSION)
797 #ifdef USE_DB
798 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
799 #else
800 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
801 #endif
802#elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
803fprintf(f, "Probably ndbm\n");
804#elif defined(USE_TDB)
805fprintf(f, "Using tdb\n");
806#else
807 #ifdef USE_GDBM
808 fprintf(f, "Probably GDBM (native mode)\n");
809 #else
810 fprintf(f, "Probably GDBM (compatibility mode)\n");
811 #endif
812#endif
813
814fprintf(f, "Support for:");
815#if HAVE_ICONV
816 fprintf(f, " iconv()");
817#endif
818#if HAVE_IPV6
819 fprintf(f, " IPv6");
820#endif
821#ifdef SUPPORT_PAM
822 fprintf(f, " PAM");
823#endif
824#ifdef EXIM_PERL
825 fprintf(f, " Perl");
826#endif
827#ifdef USE_TCP_WRAPPERS
828 fprintf(f, " TCPwrappers");
829#endif
830#ifdef SUPPORT_TLS
831 #ifdef USE_GNUTLS
832 fprintf(f, " GnuTLS");
833 #else
834 fprintf(f, " OpenSSL");
835 #endif
836#endif
837fprintf(f, "\n");
838
839fprintf(f, "Lookups:");
840#ifdef LOOKUP_LSEARCH
841 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
842#endif
843#ifdef LOOKUP_CDB
844 fprintf(f, " cdb");
845#endif
846#ifdef LOOKUP_DBM
847 fprintf(f, " dbm dbmnz");
848#endif
849#ifdef LOOKUP_DNSDB
850 fprintf(f, " dnsdb");
851#endif
852#ifdef LOOKUP_DSEARCH
853 fprintf(f, " dsearch");
854#endif
855#ifdef LOOKUP_IBASE
856 fprintf(f, " ibase");
857#endif
858#ifdef LOOKUP_LDAP
859 fprintf(f, " ldap ldapdn ldapm");
860#endif
861#ifdef LOOKUP_MYSQL
862 fprintf(f, " mysql");
863#endif
864#ifdef LOOKUP_NIS
865 fprintf(f, " nis nis0");
866#endif
867#ifdef LOOKUP_NISPLUS
868 fprintf(f, " nisplus");
869#endif
870#ifdef LOOKUP_ORACLE
871 fprintf(f, " oracle");
872#endif
873#ifdef LOOKUP_PASSWD
874 fprintf(f, " passwd");
875#endif
876#ifdef LOOKUP_PGSQL
877 fprintf(f, " pgsql");
878#endif
879#ifdef LOOKUP_TESTDB
880 fprintf(f, " testdb");
881#endif
882#ifdef LOOKUP_WHOSON
883 fprintf(f, " whoson");
884#endif
885fprintf(f, "\n");
886
887fprintf(f, "Authenticators:");
888#ifdef AUTH_CRAM_MD5
889 fprintf(f, " cram_md5");
890#endif
891#ifdef AUTH_CYRUS_SASL
892 fprintf(f, " cyrus_sasl");
893#endif
894#ifdef AUTH_PLAINTEXT
895 fprintf(f, " plaintext");
896#endif
897#ifdef AUTH_SPA
898 fprintf(f, " spa");
899#endif
900fprintf(f, "\n");
901
902fprintf(f, "Routers:");
903#ifdef ROUTER_ACCEPT
904 fprintf(f, " accept");
905#endif
906#ifdef ROUTER_DNSLOOKUP
907 fprintf(f, " dnslookup");
908#endif
909#ifdef ROUTER_IPLITERAL
910 fprintf(f, " ipliteral");
911#endif
912#ifdef ROUTER_IPLOOKUP
913 fprintf(f, " iplookup");
914#endif
915#ifdef ROUTER_MANUALROUTE
916 fprintf(f, " manualroute");
917#endif
918#ifdef ROUTER_QUERYPROGRAM
919 fprintf(f, " queryprogram");
920#endif
921#ifdef ROUTER_REDIRECT
922 fprintf(f, " redirect");
923#endif
924fprintf(f, "\n");
925
926fprintf(f, "Transports:");
927#ifdef TRANSPORT_APPENDFILE
928 fprintf(f, " appendfile");
929 #ifdef SUPPORT_MAILDIR
930 fprintf(f, "/maildir");
931 #endif
932 #ifdef SUPPORT_MAILSTORE
933 fprintf(f, "/mailstore");
934 #endif
935 #ifdef SUPPORT_MBX
936 fprintf(f, "/mbx");
937 #endif
938#endif
939#ifdef TRANSPORT_AUTOREPLY
940 fprintf(f, " autoreply");
941#endif
942#ifdef TRANSPORT_LMTP
943 fprintf(f, " lmtp");
944#endif
945#ifdef TRANSPORT_PIPE
946 fprintf(f, " pipe");
947#endif
948#ifdef TRANSPORT_SMTP
949 fprintf(f, " smtp");
950#endif
951fprintf(f, "\n");
952
953if (fixed_never_users[0] > 0)
954 {
955 int i;
956 fprintf(f, "Fixed never_users: ");
957 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
958 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
959 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
960 }
961}
962
963
964
965
966/*************************************************
967* Quote a local part *
968*************************************************/
969
970/* This function is used when a sender address or a From: or Sender: header
971line is being created from the caller's login, or from an authenticated_id. It
972applies appropriate quoting rules for a local part.
973
974Argument: the local part
975Returns: the local part, quoted if necessary
976*/
977
978uschar *
979local_part_quote(uschar *lpart)
980{
981BOOL needs_quote = FALSE;
982int size, ptr;
983uschar *yield;
984uschar *t;
985
986for (t = lpart; !needs_quote && *t != 0; t++)
987 {
988 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
989 (*t != '.' || t == lpart || t[1] == 0);
990 }
991
992if (!needs_quote) return lpart;
993
994size = ptr = 0;
995yield = string_cat(NULL, &size, &ptr, US"\"", 1);
996
997for (;;)
998 {
999 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1000 if (nq == NULL)
1001 {
1002 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1003 break;
1004 }
1005 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1006 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1007 yield = string_cat(yield, &size, &ptr, nq, 1);
1008 lpart = nq + 1;
1009 }
1010
1011yield = string_cat(yield, &size, &ptr, US"\"", 1);
1012yield[ptr] = 0;
1013return yield;
1014}
1015
1016
1017
1018#ifdef USE_READLINE
1019/*************************************************
1020* Load readline() functions *
1021*************************************************/
1022
1023/* This function is called from testing executions that read data from stdin,
1024but only when running as the calling user. Currently, only -be does this. The
1025function loads the readline() function library and passes back the functions.
1026On some systems, it needs the curses library, so load that too, but try without
1027it if loading fails. All this functionality has to be requested at build time.
1028
1029Arguments:
1030 fn_readline_ptr pointer to where to put the readline pointer
1031 fn_addhist_ptr pointer to where to put the addhistory function
1032
1033Returns: the dlopen handle or NULL on failure
1034*/
1035
1036static void *
1037set_readline(char * (**fn_readline_ptr)(char *),
1038 char * (**fn_addhist_ptr)(char *))
1039{
1040void *dlhandle;
1041void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1042
1043dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1044if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1045
1046if (dlhandle != NULL)
1047 {
1048 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1049 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1050 }
1051else
1052 {
1053 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1054 }
1055
1056return dlhandle;
1057}
1058#endif
1059
1060
1061
1062/*************************************************
1063* Get a line from stdin for testing things *
1064*************************************************/
1065
1066/* This function is called when running tests that can take a number of lines
1067of input (for example, -be and -bt). It handles continuations and trailing
1068spaces. And prompting and a blank line output on eof. If readline() is in use,
1069the arguments are non-NULL and provide the relevant functions.
1070
1071Arguments:
1072 fn_readline readline function or NULL
1073 fn_addhist addhist function or NULL
1074
1075Returns: pointer to dynamic memory, or NULL at end of file
1076*/
1077
1078static uschar *
1079get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1080{
1081int i;
1082int size = 0;
1083int ptr = 0;
1084uschar *yield = NULL;
1085
1086if (fn_readline == NULL) printf("> ");
1087
1088for (i = 0;; i++)
1089 {
1090 uschar buffer[1024];
1091 uschar *p, *ss;
1092
1093 #ifdef USE_READLINE
1094 char *readline_line = NULL;
1095 if (fn_readline != NULL)
1096 {
1097 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1098 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1099 p = US readline_line;
1100 }
1101 else
1102 #endif
1103
1104 /* readline() not in use */
1105
1106 {
1107 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1108 p = buffer;
1109 }
1110
1111 /* Handle the line */
1112
1113 ss = p + (int)Ustrlen(p);
1114 while (ss > p && isspace(ss[-1])) ss--;
1115
1116 if (i > 0)
1117 {
1118 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1119 }
1120
1121 yield = string_cat(yield, &size, &ptr, p, ss - p);
1122
1123 #ifdef USE_READLINE
1124 if (fn_readline != NULL) free(readline_line);
1125 #endif
1126
1127 if (ss == p || yield[ptr-1] != '\\')
1128 {
1129 yield[ptr] = 0;
1130 break;
1131 }
1132 yield[--ptr] = 0;
1133 }
1134
1135if (yield == NULL) printf("\n");
1136return yield;
1137}
1138
1139
1140
1141/*************************************************
1142* Entry point and high-level code *
1143*************************************************/
1144
1145/* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1146the appropriate action. All the necessary functions are present in the one
1147binary. I originally thought one should split it up, but it turns out that so
1148much of the apparatus is needed in each chunk that one might as well just have
1149it all available all the time, which then makes the coding easier as well.
1150
1151Arguments:
1152 argc count of entries in argv
1153 argv argument strings, with argv[0] being the program name
1154
1155Returns: EXIT_SUCCESS if terminated successfully
1156 EXIT_FAILURE otherwise, except when a message has been sent
1157 to the sender, and -oee was given
1158*/
1159
1160int
1161main(int argc, char **cargv)
1162{
1163uschar **argv = USS cargv;
1164int arg_receive_timeout = -1;
1165int arg_smtp_receive_timeout = -1;
1166int arg_error_handling = error_handling;
1167int filter_fd = -1;
1168int group_count;
1169int i;
1170int list_queue_option = 0;
1171int msg_action = 0;
1172int msg_action_arg = -1;
1173int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1174int queue_only_reason = 0;
1175#ifdef EXIM_PERL
1176int perl_start_option = 0;
1177#endif
1178int recipients_arg = argc;
1179int sender_address_domain = 0;
1180int test_retry_arg = -1;
1181int test_rewrite_arg = -1;
1182BOOL arg_queue_only = FALSE;
1183BOOL bi_option = FALSE;
1184BOOL checking = FALSE;
1185BOOL count_queue = FALSE;
1186BOOL expansion_test = FALSE;
1187BOOL extract_recipients = FALSE;
1188BOOL forced_delivery = FALSE;
1189BOOL f_end_dot = FALSE;
1190BOOL deliver_give_up = FALSE;
1191BOOL list_queue = FALSE;
1192BOOL list_options = FALSE;
1193BOOL local_queue_only;
1194BOOL more = TRUE;
1195BOOL one_msg_action = FALSE;
1196BOOL queue_only_set = FALSE;
1197BOOL receiving_message = TRUE;
1198BOOL unprivileged;
1199BOOL removed_privilege = FALSE;
1200BOOL verify_address_mode = FALSE;
1201BOOL verify_as_sender = FALSE;
1202BOOL version_printed = FALSE;
1203uschar *alias_arg = NULL;
1204uschar *called_as = US"";
1205uschar *start_queue_run_id = NULL;
1206uschar *stop_queue_run_id = NULL;
1207uschar *ftest_domain = NULL;
1208uschar *ftest_localpart = NULL;
1209uschar *ftest_prefix = NULL;
1210uschar *ftest_suffix = NULL;
1211uschar *real_sender_address;
1212uschar *originator_home = US"/";
1213BOOL ftest_system = FALSE;
1214void *reset_point;
1215
1216struct passwd *pw;
1217struct stat statbuf;
1218pid_t passed_qr_pid = (pid_t)0;
1219int passed_qr_pipe = -1;
1220gid_t group_list[NGROUPS_MAX];
1221
1222/* Possible options for -R and -S */
1223
1224static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1225
1226/* Need to define this in case we need to change the environment in order
1227to get rid of a bogus time zone. We have to make it char rather than uschar
1228because some OS define it in /usr/include/unistd.h. */
1229
1230extern char **environ;
1231
1232/* If the Exim user and/or group and/or the configuration file owner were
1233defined by ref:name at build time, we must now find the actual uid/gid values.
1234This is a feature to make the lives of binary distributors easier. */
1235
1236#ifdef EXIM_USERNAME
1237if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1238 {
1239 exim_gid = pw->pw_gid;
1240 }
1241else
1242 {
1243 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1244 EXIM_USERNAME);
1245 exit(EXIT_FAILURE);
1246 }
1247#endif
1248
1249#ifdef EXIM_GROUPNAME
1250if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1251 {
1252 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1253 EXIM_GROUPNAME);
1254 exit(EXIT_FAILURE);
1255 }
1256#endif
1257
1258#ifdef CONFIGURE_OWNERNAME
1259if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1260 {
1261 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1262 CONFIGURE_OWNERNAME);
1263 exit(EXIT_FAILURE);
1264 }
1265#endif
1266
1267/* In the Cygwin environment, some initialization needs doing. It is fudged
1268in by means of this macro. */
1269
1270#ifdef OS_INIT
1271OS_INIT
1272#endif
1273
1274/* Check a field which is patched when we are running Exim within its
1275testing harness; do a fast initial check, and then the whole thing. */
1276
1277running_in_test_harness =
1278 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1279
1280/* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1281at the start of a program; however, it seems that some environments do not
1282follow this. A "strange" locale can affect the formatting of timestamps, so we
1283make quite sure. */
1284
1285setlocale(LC_ALL, "C");
1286
1287/* Set up the default handler for timing using alarm(). */
1288
1289os_non_restarting_signal(SIGALRM, sigalrm_handler);
1290
1291/* Ensure we have a buffer for constructing log entries. Use malloc directly,
1292because store_malloc writes a log entry on failure. */
1293
1294log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1295if (log_buffer == NULL)
1296 {
1297 fprintf(stderr, "exim: failed to get store for log buffer\n");
1298 exit(EXIT_FAILURE);
1299 }
1300
1301/* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1302NULL when the daemon is run and the file is closed. We have to use this
1303indirection, because some systems don't allow writing to the variable "stderr".
1304*/
1305
1306if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1307
1308/* Arrange for the PCRE regex library to use our store functions. Note that
1309the normal calls are actually macros that add additional arguments for
1310debugging purposes so we have to assign specially constructed functions here.
1311The default is to use store in the stacking pool, but this is overridden in the
1312regex_must_compile() function. */
1313
1314pcre_malloc = function_store_get;
1315pcre_free = function_dummy_free;
1316
1317/* Ensure there is a big buffer for temporary use in several places. It is put
1318in malloc store so that it can be freed for enlargement if necessary. */
1319
1320big_buffer = store_malloc(big_buffer_size);
1321
1322/* Set up the handler for the data request signal, and set the initial
1323descriptive text. */
1324
1325set_process_info("initializing");
1326os_restarting_signal(SIGUSR1, usr1_handler);
1327
1328/* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1329in the daemon code. For the rest of Exim's uses, we ignore it. */
1330
1331signal(SIGHUP, SIG_IGN);
1332
1333/* We don't want to die on pipe errors as the code is written to handle
1334the write error instead. */
1335
1336signal(SIGPIPE, SIG_IGN);
1337
1338/* Under some circumstance on some OS, Exim can get called with SIGCHLD
1339set to SIG_IGN. This causes subprocesses that complete before the parent
1340process waits for them not to hang around, so when Exim calls wait(), nothing
1341is there. The wait() code has been made robust against this, but let's ensure
1342that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1343ending status. We use sigaction rather than plain signal() on those OS where
1344SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1345problem on AIX with this.) */
1346
1347#ifdef SA_NOCLDWAIT
1348 {
1349 struct sigaction act;
1350 act.sa_handler = SIG_DFL;
1351 sigemptyset(&(act.sa_mask));
1352 act.sa_flags = 0;
1353 sigaction(SIGCHLD, &act, NULL);
1354 }
1355#else
1356signal(SIGCHLD, SIG_DFL);
1357#endif
1358
1359/* Save the arguments for use if we re-exec exim as a daemon after receiving
1360SIGHUP. */
1361
1362sighup_argv = argv;
1363
1364/* Set up the version number. Set up the leading 'E' for the external form of
1365message ids, set the pointer to the internal form, and initialize it to
1366indicate no message being processed. */
1367
1368version_init();
1369message_id_option[0] = '-';
1370message_id_external = message_id_option + 1;
1371message_id_external[0] = 'E';
1372message_id = message_id_external + 1;
1373message_id[0] = 0;
1374
1375/* Set the umask to zero so that any files that Exim creates are created
1376with the modes that it specifies. */
1377
1378umask(0);
1379
1380/* Precompile the regular expression for matching a message id. Keep this in
1381step with the code that generates ids in the accept.c module. We need to do
1382this here, because the -M options check their arguments for syntactic validity
1383using mac_ismsgid, which uses this. */
1384
1385regex_ismsgid =
1386 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1387
1388/* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1389this seems to be a generally accepted convention, since one finds symbolic
1390links called "mailq" in standard OS configurations. */
1391
1392if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1393 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1394 {
1395 list_queue = TRUE;
1396 receiving_message = FALSE;
1397 called_as = US"-mailq";
1398 }
1399
1400/* If the program is called as "rmail" treat it as equivalent to
1401"exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1402i.e. preventing a single dot on a line from terminating the message, and
1403returning with zero return code, even in cases of error (provided an error
1404message has been sent). */
1405
1406if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1407 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1408 {
1409 dot_ends = FALSE;
1410 called_as = US"-rmail";
1411 errors_sender_rc = EXIT_SUCCESS;
1412 }
1413
1414/* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1415this is a smail convention. */
1416
1417if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1418 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1419 {
1420 smtp_input = smtp_batched_input = TRUE;
1421 called_as = US"-rsmtp";
1422 }
1423
1424/* If the program is called as "runq" treat it as equivalent to "exim -q";
1425this is a smail convention. */
1426
1427if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1428 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1429 {
1430 queue_interval = 0;
1431 receiving_message = FALSE;
1432 called_as = US"-runq";
1433 }
1434
1435/* If the program is called as "newaliases" treat it as equivalent to
1436"exim -bi"; this is a sendmail convention. */
1437
1438if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1439 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1440 {
1441 bi_option = TRUE;
1442 receiving_message = FALSE;
1443 called_as = US"-newaliases";
1444 }
1445
1446/* Save the original effective uid for a couple of uses later. It should
1447normally be root, but in some esoteric environments it may not be. */
1448
1449original_euid = geteuid();
1450
1451/* Get the real uid and gid. If the caller is root, force the effective uid/gid
1452to be the same as the real ones. This makes a difference only if Exim is setuid
1453(or setgid) to something other than root, which could be the case in some
1454special configurations. */
1455
1456real_uid = getuid();
1457real_gid = getgid();
1458
1459if (real_uid == root_uid)
1460 {
1461 setgid(real_gid);
1462 setuid(real_uid);
1463 }
1464
1465/* If neither the original real uid nor the original euid was root, Exim is
1466running in an unprivileged state. */
1467
1468unprivileged = (real_uid != root_uid && original_euid != root_uid);
1469
1470/* If the first argument is --help, pretend there are no arguments. This will
1471cause a brief message to be given. */
1472
1473if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1474
1475/* Scan the program's arguments. Some can be dealt with right away; others are
1476simply recorded for checking and handling afterwards. Do a high-level switch
1477on the second character (the one after '-'), to save some effort. */
1478
1479for (i = 1; i < argc; i++)
1480 {
1481 BOOL badarg = FALSE;
1482 uschar *arg = argv[i];
1483 uschar *argrest;
1484 int switchchar;
1485
1486 /* An argument not starting with '-' is the start of a recipients list;
1487 break out of the options-scanning loop. */
1488
1489 if (arg[0] != '-')
1490 {
1491 recipients_arg = i;
1492 break;
1493 }
1494
1495 /* An option consistion of -- terminates the options */
1496
1497 if (Ustrcmp(arg, "--") == 0)
1498 {
1499 recipients_arg = i + 1;
1500 break;
1501 }
1502
1503 /* Handle flagged options */
1504
1505 switchchar = arg[1];
1506 argrest = arg+2;
1507
1508 /* Make all -ex options synonymous with -oex arguments, since that
1509 is assumed by various callers. Also make -qR options synonymous with -R
1510 options, as that seems to be required as well. Allow for -qqR too, and
1511 the same for -S options. */
1512
1513 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1514 Ustrncmp(arg+1, "qR", 2) == 0 ||
1515 Ustrncmp(arg+1, "qS", 2) == 0)
1516 {
1517 switchchar = arg[2];
1518 argrest++;
1519 }
1520 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1521 {
1522 switchchar = arg[3];
1523 argrest += 2;
1524 queue_2stage = TRUE;
1525 }
1526
1527 /* Make -r synonymous with -f, since it is a documented alias */
1528
1529 else if (arg[1] == 'r') switchchar = 'f';
1530
1531 /* Make -ov synonymous with -v */
1532
1533 else if (Ustrcmp(arg, "-ov") == 0)
1534 {
1535 switchchar = 'v';
1536 argrest++;
1537 }
1538
1539 /* High-level switch on active initial letter */
1540
1541 switch(switchchar)
1542 {
1543 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1544 so has no need of it. */
1545
1546 case 'B':
1547 if (*argrest == 0) i++; /* Skip over the type */
1548 break;
1549
1550
1551 case 'b':
1552 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1553
1554 /* -bd: Run in daemon mode, awaiting SMTP connections.
1555 -bdf: Ditto, but in the foreground.
1556 */
1557
1558 if (*argrest == 'd')
1559 {
1560 daemon_listen = TRUE;
1561 if (*(++argrest) == 'f') background_daemon = FALSE;
1562 else if (*argrest != 0) { badarg = TRUE; break; }
1563 }
1564
1565 /* -be: Run in expansion test mode */
1566
1567 else if (*argrest == 'e')
1568 expansion_test = checking = TRUE;
1569
1570 /* -bf: Run in mail filter testing mode
1571 -bF: Ditto, but for system filters
1572 -bfd: Set domain for filter testing
1573 -bfl: Set local part for filter testing
1574 -bfp: Set prefix for filter testing
1575 -bfs: Set suffix for filter testing
1576 */
1577
1578 else if (*argrest == 'f' || *argrest == 'F')
1579 {
1580 ftest_system = *argrest++ == 'F';
1581 if (*argrest == 0)
1582 {
1583 if(++i < argc) filter_test = argv[i]; else
1584 {
1585 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1586 exit(EXIT_FAILURE);
1587 }
1588 }
1589 else
1590 {
1591 if (++i >= argc)
1592 {
1593 fprintf(stderr, "exim: string expected after %s\n", arg);
1594 exit(EXIT_FAILURE);
1595 }
1596 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1597 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1598 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1599 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1600 else { badarg = TRUE; break; }
1601 }
1602 }
1603
1604 /* -bh: Host checking - an IP address must follow. */
1605
1606 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1607 {
1608 if (++i >= argc) { badarg = TRUE; break; }
1609 sender_host_address = argv[i];
1610 host_checking = checking = log_testing_mode = TRUE;
1611 host_checking_callout = argrest[1] == 'c';
1612 }
1613
1614 /* -bi: This option is used by sendmail to initialize *the* alias file,
1615 though it has the -oA option to specify a different file. Exim has no
1616 concept of *the* alias file, but since Sun's YP make script calls
1617 sendmail this way, some support must be provided. */
1618
1619 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1620
1621 /* -bm: Accept and deliver message - the default option. Reinstate
1622 receiving_message, which got turned off for all -b options. */
1623
1624 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1625
1626 /* -bnq: For locally originating messages, do not qualify unqualified
1627 addresses. In the envelope, this causes errors; in header lines they
1628 just get left. */
1629
1630 else if (Ustrcmp(argrest, "nq") == 0)
1631 {
1632 allow_unqualified_sender = FALSE;
1633 allow_unqualified_recipient = FALSE;
1634 }
1635
1636 /* -bpxx: List the contents of the mail queue, in various forms. If
1637 the option is -bpc, just a queue count is needed. Otherwise, if the
1638 first letter after p is r, then order is random. */
1639
1640 else if (*argrest == 'p')
1641 {
1642 if (*(++argrest) == 'c')
1643 {
1644 count_queue = TRUE;
1645 if (*(++argrest) != 0) badarg = TRUE;
1646 break;
1647 }
1648
1649 if (*argrest == 'r')
1650 {
1651 list_queue_option = 8;
1652 argrest++;
1653 }
1654 else list_queue_option = 0;
1655
1656 list_queue = TRUE;
1657
1658 /* -bp: List the contents of the mail queue, top-level only */
1659
1660 if (*argrest == 0) {}
1661
1662 /* -bpu: List the contents of the mail queue, top-level undelivered */
1663
1664 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1665
1666 /* -bpa: List the contents of the mail queue, including all delivered */
1667
1668 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1669
1670 /* Unknown after -bp[r] */
1671
1672 else
1673 {
1674 badarg = TRUE;
1675 break;
1676 }
1677 }
1678
1679
1680 /* -bP: List the configuration variables given as the address list.
1681 Force -v, so configuration errors get displayed. */
1682
1683 else if (Ustrcmp(argrest, "P") == 0)
1684 {
1685 list_options = TRUE;
1686 debug_selector |= D_v;
1687 debug_file = stderr;
1688 }
1689
1690 /* -brt: Test retry configuration lookup */
1691
1692 else if (Ustrcmp(argrest, "rt") == 0)
1693 {
1694 test_retry_arg = i + 1;
1695 goto END_ARG;
1696 }
1697
1698 /* -brw: Test rewrite configuration */
1699
1700 else if (Ustrcmp(argrest, "rw") == 0)
1701 {
1702 test_rewrite_arg = i + 1;
1703 goto END_ARG;
1704 }
1705
1706 /* -bS: Read SMTP commands on standard input, but produce no replies -
1707 all errors are reported by sending messages. */
1708
1709 else if (Ustrcmp(argrest, "S") == 0)
1710 smtp_input = smtp_batched_input = receiving_message = TRUE;
1711
1712 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1713 on standard output. */
1714
1715 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1716
1717 /* -bt: address testing mode */
1718
1719 else if (Ustrcmp(argrest, "t") == 0)
1720 address_test_mode = checking = log_testing_mode = TRUE;
1721
1722 /* -bv: verify addresses */
1723
1724 else if (Ustrcmp(argrest, "v") == 0)
1725 verify_address_mode = checking = log_testing_mode = TRUE;
1726
1727 /* -bvs: verify sender addresses */
1728
1729 else if (Ustrcmp(argrest, "vs") == 0)
1730 {
1731 verify_address_mode = checking = log_testing_mode = TRUE;
1732 verify_as_sender = TRUE;
1733 }
1734
1735 /* -bV: Print version string and support details */
1736
1737 else if (Ustrcmp(argrest, "V") == 0)
1738 {
1739 printf("Exim version %s #%s built %s\n", version_string,
1740 version_cnumber, version_date);
1741 printf("%s\n", CS version_copyright);
1742 version_printed = TRUE;
1743 show_whats_supported(stdout);
1744 }
1745
1746 else badarg = TRUE;
1747 break;
1748
1749
1750 /* -C: change configuration file list; ignore if it isn't really
1751 a change! Enforce a prefix check if required. */
1752
1753 case 'C':
1754 if (*argrest == 0)
1755 {
1756 if(++i < argc) argrest = argv[i]; else
1757 { badarg = TRUE; break; }
1758 }
1759 if (Ustrcmp(config_main_filelist, argrest) != 0)
1760 {
1761 #ifdef ALT_CONFIG_PREFIX
1762 int sep = 0;
1763 int len = Ustrlen(ALT_CONFIG_PREFIX);
1764 uschar *list = argrest;
1765 uschar *filename;
1766 while((filename = string_nextinlist(&list, &sep, big_buffer,
1767 big_buffer_size)) != NULL)
1768 {
1769 if ((Ustrlen(filename) < len ||
1770 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1771 Ustrstr(filename, "/../") != NULL) &&
1772 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1773 {
1774 fprintf(stderr, "-C Permission denied\n");
1775 exit(EXIT_FAILURE);
1776 }
1777 }
1778 #endif
1779
1780 config_main_filelist = argrest;
1781 config_changed = TRUE;
1782 }
1783 break;
1784
1785
1786 /* -D: set up a macro definition */
1787
1788 case 'D':
1789 #ifdef DISABLE_D_OPTION
1790 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1791 exit(EXIT_FAILURE);
1792 #else
1793 {
1794 int ptr = 0;
1795 macro_item *mlast = NULL;
1796 macro_item *m;
1797 uschar name[24];
1798 uschar *s = argrest;
1799
1800 while (isspace(*s)) s++;
1801
1802 if (*s < 'A' || *s > 'Z')
1803 {
1804 fprintf(stderr, "exim: macro name set by -D must start with "
1805 "an upper case letter\n");
1806 exit(EXIT_FAILURE);
1807 }
1808
1809 while (isalnum(*s) || *s == '_')
1810 {
1811 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1812 s++;
1813 }
1814 name[ptr] = 0;
1815 if (ptr == 0) { badarg = TRUE; break; }
1816 while (isspace(*s)) s++;
1817 if (*s != 0)
1818 {
1819 if (*s++ != '=') { badarg = TRUE; break; }
1820 while (isspace(*s)) s++;
1821 }
1822
1823 for (m = macros; m != NULL; m = m->next)
1824 {
1825 if (Ustrcmp(m->name, name) == 0)
1826 {
1827 fprintf(stderr, "exim: duplicated -D in command line\n");
1828 exit(EXIT_FAILURE);
1829 }
1830 mlast = m;
1831 }
1832
1833 m = store_get(sizeof(macro_item) + Ustrlen(name));
1834 m->next = NULL;
1835 m->command_line = TRUE;
1836 if (mlast == NULL) macros = m; else mlast->next = m;
1837 Ustrcpy(m->name, name);
1838 m->replacement = string_copy(s);
1839
1840 if (clmacro_count >= MAX_CLMACROS)
1841 {
1842 fprintf(stderr, "exim: too many -D options on command line\n");
1843 exit(EXIT_FAILURE);
1844 }
1845 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1846 m->replacement);
1847 }
1848 #endif
1849 break;
1850
1851 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1852 The latter is now a no-opt, retained for compatibility only. */
1853
1854 case 'd':
1855 if (Ustrcmp(argrest, "ropcr") == 0)
1856 {
1857 /* drop_cr = TRUE; */
1858 }
1859
1860 /* Use an intermediate variable so that we don't set debugging while
1861 decoding the debugging bits. */
1862
1863 else
1864 {
1865 unsigned int selector = D_default;
1866 debug_selector = 0;
1867 debug_file = NULL;
1868 if (*argrest != 0)
1869 decode_bits(&selector, NULL, argrest, debug_options,
1870 debug_options_count, US"debug");
1871 debug_selector = selector;
1872 }
1873 break;
1874
1875
1876 /* -E: This is a local error message. This option is not intended for
1877 external use at all, but is not restricted to trusted callers because it
1878 does no harm (just suppresses certain error messages) and if Exim is run
1879 not setuid root it won't always be trusted when it generates error
1880 messages using this option. If there is a message id following -E, point
1881 message_reference at it, for logging. */
1882
1883 case 'E':
1884 local_error_message = TRUE;
1885 if (mac_ismsgid(argrest)) message_reference = argrest;
1886 break;
1887
1888
1889 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1890 option, so it looks as if historically the -oex options are also callable
1891 without the leading -o. So we have to accept them. Before the switch,
1892 anything starting -oe has been converted to -e. Exim does not support all
1893 of the sendmail error options. */
1894
1895 case 'e':
1896 if (Ustrcmp(argrest, "e") == 0)
1897 {
1898 arg_error_handling = ERRORS_SENDER;
1899 errors_sender_rc = EXIT_SUCCESS;
1900 }
1901 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1902 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1903 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1904 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1905 else badarg = TRUE;
1906 break;
1907
1908
1909 /* -F: Set sender's full name, used instead of the gecos entry from
1910 the password file. Since users can usually alter their gecos entries,
1911 there's no security involved in using this instead. The data can follow
1912 the -F or be in the next argument. */
1913
1914 case 'F':
1915 if (*argrest == 0)
1916 {
1917 if(++i < argc) argrest = argv[i]; else
1918 { badarg = TRUE; break; }
1919 }
1920 originator_name = argrest;
1921 break;
1922
1923
1924 /* -f: Set sender's address - this value is only actually used if Exim is
1925 run by a trusted user, or if untrusted_set_sender is set and matches the
1926 address, except that the null address can always be set by any user. The
1927 test for this happens later, when the value given here is ignored when not
1928 permitted. For an untrusted user, the actual sender is still put in Sender:
1929 if it doesn't match the From: header (unless no_local_from_check is set).
1930 The data can follow the -f or be in the next argument. The -r switch is an
1931 obsolete form of -f but since there appear to be programs out there that
1932 use anything that sendmail has ever supported, better accept it - the
1933 synonymizing is done before the switch above.
1934
1935 At this stage, we must allow domain literal addresses, because we don't
1936 know what the setting of allow_domain_literals is yet. Ditto for trailing
1937 dots and strip_trailing_dot. */
1938
1939 case 'f':
1940 {
1941 int start, end;
1942 uschar *errmess;
1943 if (*argrest == 0)
1944 {
1945 if (i+1 < argc) argrest = argv[++i]; else
1946 { badarg = TRUE; break; }
1947 }
1948 if (*argrest == 0)
1949 {
1950 sender_address = string_sprintf(""); /* Ensure writeable memory */
1951 }
1952 else
1953 {
1954 uschar *temp = argrest + Ustrlen(argrest) - 1;
1955 while (temp >= argrest && isspace(*temp)) temp--;
1956 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
1957 allow_domain_literals = TRUE;
1958 strip_trailing_dot = TRUE;
1959 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
1960 &sender_address_domain, TRUE);
1961 allow_domain_literals = FALSE;
1962 strip_trailing_dot = FALSE;
1963 if (sender_address == NULL)
1964 {
1965 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
1966 return EXIT_FAILURE;
1967 }
1968 }
1969 sender_address_forced = TRUE;
1970 }
1971 break;
1972
1973 /* This is some Sendmail thing which can be ignored */
1974
1975 case 'G':
1976 break;
1977
1978 /* -h: Set the hop count for an incoming message. Exim does not currently
1979 support this; it always computes it by counting the Received: headers.
1980 To put it in will require a change to the spool header file format. */
1981
1982 case 'h':
1983 if (*argrest == 0)
1984 {
1985 if(++i < argc) argrest = argv[i]; else
1986 { badarg = TRUE; break; }
1987 }
1988 if (!isdigit(*argrest)) badarg = TRUE;
1989 break;
1990
1991
1992 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
1993 not to be documented for sendmail but mailx (at least) uses it) */
1994
1995 case 'i':
1996 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
1997 break;
1998
1999
2000 case 'M':
2001 receiving_message = FALSE;
2002
2003 /* -MC: continue delivery of another message via an existing open
2004 file descriptor. This option is used for an internal call by the
2005 smtp transport when there is a pending message waiting to go to an
2006 address to which it has got a connection. Five subsequent arguments are
2007 required: transport name, host name, IP address, sequence number, and
2008 message_id. Transports may decline to create new processes if the sequence
2009 number gets too big. The channel is stdin. This (-MC) must be the last
2010 argument. There's a subsequent check that the real-uid is privileged.
2011
2012 If we are running in the test harness. delay for a bit, to let the process
2013 that set this one up complete. This makes for repeatability of the logging,
2014 etc. output. */
2015
2016 if (Ustrcmp(argrest, "C") == 0)
2017 {
2018 if (argc != i + 6)
2019 {
2020 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2021 return EXIT_FAILURE;
2022 }
2023
2024 if (msg_action_arg >= 0)
2025 {
2026 fprintf(stderr, "exim: incompatible arguments\n");
2027 return EXIT_FAILURE;
2028 }
2029
2030 continue_transport = argv[++i];
2031 continue_hostname = argv[++i];
2032 continue_host_address = argv[++i];
2033 continue_sequence = Uatoi(argv[++i]);
2034 msg_action = MSG_DELIVER;
2035 msg_action_arg = ++i;
2036 forced_delivery = TRUE;
2037 queue_run_pid = passed_qr_pid;
2038 queue_run_pipe = passed_qr_pipe;
2039
2040 if (!mac_ismsgid(argv[i]))
2041 {
2042 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2043 argv[i]);
2044 return EXIT_FAILURE;
2045 }
2046
2047 if (running_in_test_harness) millisleep(500);
2048 break;
2049 }
2050
2051 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2052 precedes -MC (see above). The flag indicates that the host to which
2053 Exim is connected has accepted an AUTH sequence. */
2054
2055 else if (Ustrcmp(argrest, "CA") == 0)
2056 {
2057 smtp_authenticated = TRUE;
2058 break;
2059 }
2060
2061 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2062 it preceded -MC (see above) */
2063
2064 else if (Ustrcmp(argrest, "CP") == 0)
2065 {
2066 smtp_use_pipelining = TRUE;
2067 break;
2068 }
2069
2070 /* -MCQ: pass on the pid of the queue-running process that started
2071 this chain of deliveries and the fd of its synchronizing pipe; this
2072 is useful only when it precedes -MC (see above) */
2073
2074 else if (Ustrcmp(argrest, "CQ") == 0)
2075 {
2076 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2077 else badarg = TRUE;
2078 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2079 else badarg = TRUE;
2080 break;
2081 }
2082
2083 /* -MCS: set the smtp_use_size flag; this is useful only when it
2084 precedes -MC (see above) */
2085
2086 else if (Ustrcmp(argrest, "CS") == 0)
2087 {
2088 smtp_use_size = TRUE;
2089 break;
2090 }
2091
2092 /* -MCT: set the tls_offered flag; this is useful only when it
2093 precedes -MC (see above). The flag indicates that the host to which
2094 Exim is connected has offered TLS support. */
2095
2096 #ifdef SUPPORT_TLS
2097 else if (Ustrcmp(argrest, "CT") == 0)
2098 {
2099 tls_offered = TRUE;
2100 break;
2101 }
2102 #endif
2103
2104 /* -M[x]: various operations on the following list of message ids:
2105 -M deliver the messages, ignoring next retry times and thawing
2106 -Mc deliver the messages, checking next retry times, no thawing
2107 -Mf freeze the messages
2108 -Mg give up on the messages
2109 -Mt thaw the messages
2110 -Mrm remove the messages
2111 In the above cases, this must be the last option. There are also the
2112 following options which are followed by a single message id, and which
2113 act on that message. Some of them use the "recipient" addresses as well.
2114 -Mar add recipient(s)
2115 -Mmad mark all recipients delivered
2116 -Mmd mark recipients(s) delivered
2117 -Mes edit sender
2118 -Mvb show body
2119 -Mvh show header
2120 -Mvl show log
2121 */
2122
2123 else if (*argrest == 0)
2124 {
2125 msg_action = MSG_DELIVER;
2126 forced_delivery = deliver_force_thaw = TRUE;
2127 }
2128 else if (Ustrcmp(argrest, "ar") == 0)
2129 {
2130 msg_action = MSG_ADD_RECIPIENT;
2131 one_msg_action = TRUE;
2132 }
2133 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2134 else if (Ustrcmp(argrest, "es") == 0)
2135 {
2136 msg_action = MSG_EDIT_SENDER;
2137 one_msg_action = TRUE;
2138 }
2139 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2140 else if (Ustrcmp(argrest, "g") == 0)
2141 {
2142 msg_action = MSG_DELIVER;
2143 deliver_give_up = TRUE;
2144 }
2145 else if (Ustrcmp(argrest, "mad") == 0)
2146 {
2147 msg_action = MSG_MARK_ALL_DELIVERED;
2148 }
2149 else if (Ustrcmp(argrest, "md") == 0)
2150 {
2151 msg_action = MSG_MARK_DELIVERED;
2152 one_msg_action = TRUE;
2153 }
2154 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2155 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2156 else if (Ustrcmp(argrest, "vb") == 0)
2157 {
2158 msg_action = MSG_SHOW_BODY;
2159 one_msg_action = TRUE;
2160 }
2161 else if (Ustrcmp(argrest, "vh") == 0)
2162 {
2163 msg_action = MSG_SHOW_HEADER;
2164 one_msg_action = TRUE;
2165 }
2166 else if (Ustrcmp(argrest, "vl") == 0)
2167 {
2168 msg_action = MSG_SHOW_LOG;
2169 one_msg_action = TRUE;
2170 }
2171 else { badarg = TRUE; break; }
2172
2173 /* All the -Mxx options require at least one message id. */
2174
2175 msg_action_arg = i + 1;
2176 if (msg_action_arg >= argc)
2177 {
2178 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2179 return EXIT_FAILURE;
2180 }
2181
2182 /* Some require only message ids to follow */
2183
2184 if (!one_msg_action)
2185 {
2186 int j;
2187 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2188 {
2189 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2190 argv[j], arg);
2191 return EXIT_FAILURE;
2192 }
2193 goto END_ARG; /* Remaining args are ids */
2194 }
2195
2196 /* Others require only one message id, possibly followed by addresses,
2197 which will be handled as normal arguments. */
2198
2199 else
2200 {
2201 if (!mac_ismsgid(argv[msg_action_arg]))
2202 {
2203 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2204 argv[msg_action_arg], arg);
2205 return EXIT_FAILURE;
2206 }
2207 i++;
2208 }
2209 break;
2210
2211
2212 /* Some programs seem to call the -om option without the leading o;
2213 for sendmail it askes for "me too". Exim always does this. */
2214
2215 case 'm':
2216 if (*argrest != 0) badarg = TRUE;
2217 break;
2218
2219
2220 /* -N: don't do delivery - a debugging option that stops transports doing
2221 their thing. It implies debugging at the D_v level. */
2222
2223 case 'N':
2224 if (*argrest == 0)
2225 {
2226 dont_deliver = TRUE;
2227 debug_selector |= D_v;
2228 debug_file = stderr;
2229 }
2230 else badarg = TRUE;
2231 break;
2232
2233
2234 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2235 it. */
2236
2237 case 'n':
2238 break;
2239
2240 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2241 option to the specified value. This form uses long names. We need to handle
2242 -O option=value and -Ooption=value. */
2243
2244 case 'O':
2245 if (*argrest == 0)
2246 {
2247 if (++i >= argc)
2248 {
2249 fprintf(stderr, "exim: string expected after -O\n");
2250 exit(EXIT_FAILURE);
2251 }
2252 }
2253 break;
2254
2255 case 'o':
2256
2257 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2258 file" option). */
2259
2260 if (*argrest == 'A')
2261 {
2262 alias_arg = argrest + 1;
2263 if (alias_arg[0] == 0)
2264 {
2265 if (i+1 < argc) alias_arg = argv[++i]; else
2266 {
2267 fprintf(stderr, "exim: string expected after -oA\n");
2268 exit(EXIT_FAILURE);
2269 }
2270 }
2271 }
2272
2273 /* -oB: Set a connection message max value for remote deliveries */
2274
2275 else if (*argrest == 'B')
2276 {
2277 uschar *p = argrest + 1;
2278 if (p[0] == 0)
2279 {
2280 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2281 {
2282 connection_max_messages = 1;
2283 p = NULL;
2284 }
2285 }
2286
2287 if (p != NULL)
2288 {
2289 if (!isdigit(*p))
2290 {
2291 fprintf(stderr, "exim: number expected after -oB\n");
2292 exit(EXIT_FAILURE);
2293 }
2294 connection_max_messages = Uatoi(p);
2295 }
2296 }
2297
2298 /* -odb: background delivery */
2299
2300 else if (Ustrcmp(argrest, "db") == 0)
2301 {
2302 synchronous_delivery = FALSE;
2303 arg_queue_only = FALSE;
2304 queue_only_set = TRUE;
2305 }
2306
2307 /* -odf: foreground delivery (smail-compatible option); same effect as
2308 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2309 */
2310
2311 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2312 {
2313 synchronous_delivery = TRUE;
2314 arg_queue_only = FALSE;
2315 queue_only_set = TRUE;
2316 }
2317
2318 /* -odq: queue only */
2319
2320 else if (Ustrcmp(argrest, "dq") == 0)
2321 {
2322 synchronous_delivery = FALSE;
2323 arg_queue_only = TRUE;
2324 queue_only_set = TRUE;
2325 }
2326
2327 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2328 but no remote delivery */
2329
2330 else if (Ustrcmp(argrest, "dqs") == 0)
2331 {
2332 queue_smtp = TRUE;
2333 arg_queue_only = FALSE;
2334 queue_only_set = TRUE;
2335 }
2336
2337 /* -oex: Sendmail error flags. As these are also accepted without the
2338 leading -o prefix, for compatibility with vacation and other callers,
2339 they are handled with -e above. */
2340
2341 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2342 -oitrue: Another sendmail syntax for the same */
2343
2344 else if (Ustrcmp(argrest, "i") == 0 ||
2345 Ustrcmp(argrest, "itrue") == 0)
2346 dot_ends = FALSE;
2347
2348 /* -oM*: Set various characteristics for an incoming message; actually
2349 acted on for trusted callers only. */
2350
2351 else if (*argrest == 'M')
2352 {
2353 if (i+1 >= argc)
2354 {
2355 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2356 exit(EXIT_FAILURE);
2357 }
2358
2359 /* -oMa: Set sender host address */
2360
2361 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2362
2363 /* -oMaa: Set authenticator name */
2364
2365 else if (Ustrcmp(argrest, "Maa") == 0)
2366 sender_host_authenticated = argv[++i];
2367
2368 /* -oMas: setting authenticated sender */
2369
2370 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2371
2372 /* -oMai: setting authenticated id */
2373
2374 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2375
2376 /* -oMi: Set incoming interface address */
2377
2378 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2379
2380 /* -oMr: Received protocol */
2381
2382 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2383
2384 /* -oMs: Set sender host name */
2385
2386 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2387
2388 /* -oMt: Set sender ident */
2389
2390 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2391
2392 /* Else a bad argument */
2393
2394 else
2395 {
2396 badarg = TRUE;
2397 break;
2398 }
2399 }
2400
2401 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2402 seem to call this as -m (undocumented), so that is also accepted (see
2403 above). */
2404
2405 else if (Ustrcmp(argrest, "m") == 0) {}
2406
2407 /* -oo: An ancient flag for old-style addresses which still seems to
2408 crop up in some calls (see in SCO). */
2409
2410 else if (Ustrcmp(argrest, "o") == 0) {}
2411
2412 /* -oP <name>: set pid file path for daemon */
2413
2414 else if (Ustrcmp(argrest, "P") == 0)
2415 override_pid_file_path = argv[++i];
2416
2417 /* -or <n>: set timeout for non-SMTP acceptance
2418 -os <n>: set timeout for SMTP acceptance */
2419
2420 else if (*argrest == 'r' || *argrest == 's')
2421 {
2422 int *tp = (*argrest == 'r')?
2423 &arg_receive_timeout : &arg_smtp_receive_timeout;
2424 if (argrest[1] == 0)
2425 {
2426 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2427 }
2428 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2429 if (*tp < 0)
2430 {
2431 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2432 exit(EXIT_FAILURE);
2433 }
2434 }
2435
2436 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2437
2438 else if (Ustrcmp(argrest, "X") == 0)
2439 override_local_interfaces = argv[++i];
2440
2441 /* Unknown -o argument */
2442
2443 else badarg = TRUE;
2444 break;
2445
2446
2447 /* -ps: force Perl startup; -pd force delayed Perl startup */
2448
2449 case 'p':
2450 #ifdef EXIM_PERL
2451 if (*argrest == 's' && argrest[1] == 0)
2452 {
2453 perl_start_option = 1;
2454 break;
2455 }
2456 if (*argrest == 'd' && argrest[1] == 0)
2457 {
2458 perl_start_option = -1;
2459 break;
2460 }
2461 #endif
2462
2463 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2464 which sets the host protocol and host name */
2465
2466 if (*argrest == 0)
2467 {
2468 if (i+1 < argc) argrest = argv[++i]; else
2469 { badarg = TRUE; break; }
2470 }
2471
2472 if (*argrest != 0)
2473 {
2474 uschar *hn = Ustrchr(argrest, ':');
2475 if (hn == NULL)
2476 {
2477 received_protocol = argrest;
2478 }
2479 else
2480 {
2481 received_protocol = string_copyn(argrest, hn - argrest);
2482 sender_host_name = hn + 1;
2483 }
2484 }
2485 break;
2486
2487
2488 case 'q':
2489 receiving_message = FALSE;
2490
2491 /* -qq...: Do queue runs in a 2-stage manner */
2492
2493 if (*argrest == 'q')
2494 {
2495 queue_2stage = TRUE;
2496 argrest++;
2497 }
2498
2499 /* -qi...: Do only first (initial) deliveries */
2500
2501 if (*argrest == 'i')
2502 {
2503 queue_run_first_delivery = TRUE;
2504 argrest++;
2505 }
2506
2507 /* -qf...: Run the queue, forcing deliveries
2508 -qff..: Ditto, forcing thawing as well */
2509
2510 if (*argrest == 'f')
2511 {
2512 queue_run_force = TRUE;
2513 if (*(++argrest) == 'f')
2514 {
2515 deliver_force_thaw = TRUE;
2516 argrest++;
2517 }
2518 }
2519
2520 /* -q[f][f]l...: Run the queue only on local deliveries */
2521
2522 if (*argrest == 'l')
2523 {
2524 queue_run_local = TRUE;
2525 argrest++;
2526 }
2527
2528 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2529 optionally starting from a given message id. */
2530
2531 if (*argrest == 0 &&
2532 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2533 {
2534 queue_interval = 0;
2535 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2536 start_queue_run_id = argv[++i];
2537 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2538 stop_queue_run_id = argv[++i];
2539 }
2540
2541 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2542 optionally local only. */
2543
2544 else
2545 {
2546 if (*argrest != 0)
2547 queue_interval = readconf_readtime(argrest, 0, FALSE);
2548 else
2549 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2550 if (queue_interval <= 0)
2551 {
2552 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2553 exit(EXIT_FAILURE);
2554 }
2555 }
2556 break;
2557
2558
2559 case 'R': /* Synonymous with -qR... */
2560 receiving_message = FALSE;
2561
2562 /* -Rf: As -R (below) but force all deliveries,
2563 -Rff: Ditto, but also thaw all frozen messages,
2564 -Rr: String is regex
2565 -Rrf: Regex and force
2566 -Rrff: Regex and force and thaw
2567
2568 in all cases provided there are no further characters in this
2569 argument. */
2570
2571 if (*argrest != 0)
2572 {
2573 int i;
2574 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2575 {
2576 if (Ustrcmp(argrest, rsopts[i]) == 0)
2577 {
2578 if (i != 2) queue_run_force = TRUE;
2579 if (i >= 2) deliver_selectstring_regex = TRUE;
2580 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2581 argrest += Ustrlen(rsopts[i]);
2582 }
2583 }
2584 }
2585
2586 /* -R: Set string to match in addresses for forced queue run to
2587 pick out particular messages. */
2588
2589 if (*argrest == 0)
2590 {
2591 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2592 {
2593 fprintf(stderr, "exim: string expected after -R\n");
2594 exit(EXIT_FAILURE);
2595 }
2596 }
2597 else deliver_selectstring = argrest;
2598 if (queue_interval < 0) queue_interval = 0;
2599 break;
2600
2601
2602 /* -r: an obsolete synonym for -f (see above) */
2603
2604
2605 /* -S: Like -R but works on sender. */
2606
2607 case 'S': /* Synonymous with -qS... */
2608 receiving_message = FALSE;
2609
2610 /* -Sf: As -S (below) but force all deliveries,
2611 -Sff: Ditto, but also thaw all frozen messages,
2612 -Sr: String is regex
2613 -Srf: Regex and force
2614 -Srff: Regex and force and thaw
2615
2616 in all cases provided there are no further characters in this
2617 argument. */
2618
2619 if (*argrest != 0)
2620 {
2621 int i;
2622 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2623 {
2624 if (Ustrcmp(argrest, rsopts[i]) == 0)
2625 {
2626 if (i != 2) queue_run_force = TRUE;
2627 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2628 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2629 argrest += Ustrlen(rsopts[i]);
2630 }
2631 }
2632 }
2633
2634 /* -S: Set string to match in addresses for forced queue run to
2635 pick out particular messages. */
2636
2637 if (*argrest == 0)
2638 {
2639 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2640 {
2641 fprintf(stderr, "exim: string expected after -S\n");
2642 exit(EXIT_FAILURE);
2643 }
2644 }
2645 else deliver_selectstring_sender = argrest;
2646 if (queue_interval < 0) queue_interval = 0;
2647 break;
2648
2649 /* -Tqt is an option that is exclusively for use by the testing suite.
2650 It is not recognized in other circumstances. It allows for the setting up
2651 of explicit "queue times" so that various warning/retry things can be
2652 tested. Otherwise variability of clock ticks etc. cause problems. */
2653
2654 case 'T':
2655 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2656 fudged_queue_times = argv[++i];
2657 else badarg = TRUE;
2658 break;
2659
2660
2661 /* -t: Set flag to extract recipients from body of message. */
2662
2663 case 't':
2664 if (*argrest == 0) extract_recipients = TRUE;
2665
2666 /* -ti: Set flag to extract recipients from body of message, and also
2667 specify that dot does not end the message. */
2668
2669 else if (Ustrcmp(argrest, "i") == 0)
2670 {
2671 extract_recipients = TRUE;
2672 dot_ends = FALSE;
2673 }
2674
2675 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2676
2677 #ifdef SUPPORT_TLS
2678 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2679 #endif
2680
2681 else badarg = TRUE;
2682 break;
2683
2684
2685 /* -U: This means "initial user submission" in sendmail, apparently. The
2686 doc claims that in future sendmail may refuse syntactically invalid
2687 messages instead of fixing them. For the moment, we just ignore it. */
2688
2689 case 'U':
2690 break;
2691
2692
2693 /* -v: verify things - this is a very low-level debugging */
2694
2695 case 'v':
2696 if (*argrest == 0)
2697 {
2698 debug_selector |= D_v;
2699 debug_file = stderr;
2700 }
2701 else badarg = TRUE;
2702 break;
2703
2704
2705 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2706
2707 The -x flag tells the sendmail command that mail from a local
2708 mail program has National Language Support (NLS) extended characters
2709 in the body of the mail item. The sendmail command can send mail with
2710 extended NLS characters across networks that normally corrupts these
2711 8-bit characters.
2712
2713 As Exim is 8-bit clean, it just ignores this flag. */
2714
2715 case 'x':
2716 if (*argrest != 0) badarg = TRUE;
2717 break;
2718
2719 /* All other initial characters are errors */
2720
2721 default:
2722 badarg = TRUE;
2723 break;
2724 } /* End of high-level switch statement */
2725
2726 /* Failed to recognize the option, or syntax error */
2727
2728 if (badarg)
2729 {
2730 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2731 "option %s\n", arg);
2732 exit(EXIT_FAILURE);
2733 }
2734 }
2735
2736
2737/* Arguments have been processed. Check for incompatibilities. */
2738
2739END_ARG:
2740if ((
2741 (smtp_input || extract_recipients || recipients_arg < argc) &&
2742 (daemon_listen || queue_interval >= 0 || bi_option ||
2743 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2744 filter_test != NULL || (msg_action_arg > 0 && !one_msg_action))
2745 ) ||
2746 (
2747 msg_action_arg > 0 &&
2748 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2749 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2750 ) ||
2751 (
2752 (daemon_listen || queue_interval >= 0) &&
2753 (sender_address != NULL || list_options || list_queue || checking ||
2754 bi_option)
2755 ) ||
2756 (
2757 daemon_listen && queue_interval == 0
2758 ) ||
2759 (
2760 list_options &&
2761 (checking || smtp_input || extract_recipients ||
2762 filter_test != NULL || bi_option)
2763 ) ||
2764 (
2765 verify_address_mode &&
2766 (address_test_mode || smtp_input || extract_recipients ||
2767 filter_test != NULL || bi_option)
2768 ) ||
2769 (
2770 address_test_mode && (smtp_input || extract_recipients ||
2771 filter_test != NULL || bi_option)
2772 ) ||
2773 (
2774 smtp_input && (sender_address != NULL || filter_test != NULL ||
2775 extract_recipients)
2776 ) ||
2777 (
2778 deliver_selectstring != NULL && queue_interval < 0
2779 )
2780 )
2781 {
2782 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2783 exit(EXIT_FAILURE);
2784 }
2785
2786/* If debugging is set up, set the file and the file descriptor to pass on to
2787child processes. It should, of course, be 2 for stderr. Also, force the daemon
2788to run in the foreground. */
2789
2790if (debug_selector != 0)
2791 {
2792 debug_file = stderr;
2793 debug_fd = fileno(debug_file);
2794 background_daemon = FALSE;
2795 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2796 if (debug_selector != D_v) /* -v only doesn't show this */
2797 {
2798 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2799 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2800 debug_selector);
2801 show_whats_supported(stderr);
2802 }
2803 }
2804
2805/* When started with root privilege, ensure that the limits on the number of
2806open files and the number of processes (where that is accessible) are
2807sufficiently large, or are unset, in case Exim has been called from an
2808environment where the limits are screwed down. Not all OS have the ability to
2809change some of these limits. */
2810
2811if (unprivileged)
2812 {
2813 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2814 }
2815else
2816 {
2817 struct rlimit rlp;
2818
2819 #ifdef RLIMIT_NOFILE
2820 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2821 {
2822 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2823 strerror(errno));
2824 rlp.rlim_cur = rlp.rlim_max = 0;
2825 }
2826 if (rlp.rlim_cur < 1000)
2827 {
2828 rlp.rlim_cur = rlp.rlim_max = 1000;
2829 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2830 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2831 strerror(errno));
2832 }
2833 #endif
2834
2835 #ifdef RLIMIT_NPROC
2836 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2837 {
2838 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2839 strerror(errno));
2840 rlp.rlim_cur = rlp.rlim_max = 0;
2841 }
2842
2843 #ifdef RLIM_INFINITY
2844 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2845 {
2846 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2847 #else
2848 if (rlp.rlim_cur < 1000)
2849 {
2850 rlp.rlim_cur = rlp.rlim_max = 1000;
2851 #endif
2852 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2853 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2854 strerror(errno));
2855 }
2856 #endif
2857 }
2858
2859/* Exim is normally entered as root (but some special configurations are
2860possible that don't do this). However, it always spins off sub-processes that
2861set their uid and gid as required for local delivery. We don't want to pass on
2862any extra groups that root may belong to, so we want to get rid of them all at
2863this point.
2864
2865We need to obey setgroups() at this stage, before possibly giving up root
2866privilege for a changed configuration file, but later on we might need to
2867check on the additional groups for the admin user privilege - can't do that
2868till after reading the config, which might specify the exim gid. Therefore,
2869save the group list here first. */
2870
2871group_count = getgroups(NGROUPS_MAX, group_list);
2872
2873/* There is a fundamental difference in some BSD systems in the matter of
2874groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2875known not to be different. On the "different" systems there is a single group
2876list, and the first entry in it is the current group. On all other versions of
2877Unix there is a supplementary group list, which is in *addition* to the current
2878group. Consequently, to get rid of all extraneous groups on a "standard" system
2879you pass over 0 groups to setgroups(), while on a "different" system you pass
2880over a single group - the current group, which is always the first group in the
2881list. Calling setgroups() with zero groups on a "different" system results in
2882an error return. The following code should cope with both types of system.
2883
2884However, if this process isn't running as root, setgroups() can't be used
2885since you have to be root to run it, even if throwing away groups. Not being
2886root here happens only in some unusual configurations. We just ignore the
2887error. */
2888
2889if (setgroups(0, NULL) != 0)
2890 {
2891 if (setgroups(1, group_list) != 0 && !unprivileged)
2892 {
2893 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2894 exit(EXIT_FAILURE);
2895 }
2896 }
2897
2898/* If the configuration file name has been altered by an argument on the
2899command line (either a new file name or a macro definition) and the caller is
2900not root or the exim user, or if this is a filter testing run, remove any
2901setuid privilege the program has, and run as the underlying user.
2902
2903If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2904severely restricts the use of -C for some purposes.
2905
2906Otherwise, set the real ids to the effective values (should be root unless run
2907from inetd, which it can either be root or the exim uid, if one is configured).
2908
2909There is a private mechanism for bypassing some of this, in order to make it
2910possible to test lots of configurations automatically, without having either to
2911recompile each time, or to patch in an actual configuration file name and other
2912values (such as the path name). If running in the test harness, pretend that
2913configuration file changes and macro definitions haven't happened. */
2914
2915if (( /* EITHER */
2916 (config_changed || macros != NULL) && /* Config changed, and */
2917 real_uid != root_uid && /* Not root, and */
2918 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2919 real_uid != exim_uid && /* Not exim, and */
2920 #endif
2921 !running_in_test_harness /* Not fudged */
2922 ) || /* OR */
2923 expansion_test /* expansion testing */
2924 || /* OR */
2925 filter_test != NULL) /* Filter testing */
2926 {
2927 setgroups(group_count, group_list);
2928 exim_setugid(real_uid, real_gid, FALSE,
2929 US"-C, -D, -be or -bf forces real uid");
2930 removed_privilege = TRUE;
2931
2932 /* In the normal case when Exim is called like this, stderr is available
2933 and should be used for any logging information because attempts to write
2934 to the log will usually fail. To arrange this, we unset really_exim. However,
2935 if no stderr is available there is no point - we might as well have a go
2936 at the log (if it fails, syslog will be written). */
2937
2938 if (log_stderr != NULL) really_exim = FALSE;
2939 }
2940
2941/* Privilege is to be retained for the moment. It may be dropped later,
2942depending on the job that this Exim process has been asked to do. For now, set
2943the real uid to the effective so that subsequent re-execs of Exim are done by a
2944privileged user. */
2945
2946else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
2947
2948/* If testing a filter, open the file now, before wasting time doing other
2949setups and reading the message. */
2950
2951if (filter_test != NULL)
2952 {
2953 filter_fd = Uopen(filter_test, O_RDONLY,0);
2954 if (filter_fd < 0)
2955 {
2956 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test,
2957 strerror(errno));
2958 return EXIT_FAILURE;
2959 }
2960 }
2961
2962/* Read the main runtime configuration data; this gives up if there
2963is a failure. It leaves the configuration file open so that the subsequent
2964configuration data for delivery can be read if needed. */
2965
2966readconf_main();
2967
2968/* Handle the decoding of logging options. */
2969
2970decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
2971 log_options, log_options_count, US"log");
2972
2973DEBUG(D_any)
2974 {
2975 debug_printf("configuration file is %s\n", config_main_filename);
2976 debug_printf("log selectors = %08x %08x\n", log_write_selector,
2977 log_extra_selector);
2978 }
2979
2980/* If domain literals are not allowed, check the sender address that was
2981supplied with -f. Ditto for a stripped trailing dot. */
2982
2983if (sender_address != NULL)
2984 {
2985 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
2986 {
2987 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
2988 "allowed\n", sender_address);
2989 return EXIT_FAILURE;
2990 }
2991 if (f_end_dot && !strip_trailing_dot)
2992 {
2993 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
2994 "(trailing dot not allowed)\n", sender_address);
2995 return EXIT_FAILURE;
2996 }
2997 }
2998
2999/* Paranoia check of maximum lengths of certain strings. There is a check
3000on the length of the log file path in log.c, which will come into effect
3001if there are any calls to write the log earlier than this. However, if we
3002get this far but the string is very long, it is better to stop now than to
3003carry on and (e.g.) receive a message and then have to collapse. The call to
3004log_write() from here will cause the ultimate panic collapse if the complete
3005file name exceeds the buffer length. */
3006
3007if (Ustrlen(log_file_path) > 200)
3008 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3009 "log_file_path is longer than 200 chars: aborting");
3010
3011if (Ustrlen(pid_file_path) > 200)
3012 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3013 "pid_file_path is longer than 200 chars: aborting");
3014
3015if (Ustrlen(spool_directory) > 200)
3016 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3017 "spool_directory is longer than 200 chars: aborting");
3018
3019/* Length check on the process name given to syslog for its TAG field,
3020which is only permitted to be 32 characters or less. See RFC 3164. */
3021
3022if (Ustrlen(syslog_processname) > 32)
3023 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3024 "syslog_processname is longer than 32 chars: aborting");
3025
3026/* In some operating systems, the environment variable TMPDIR controls where
3027temporary files are created; Exim doesn't use these (apart from when delivering
3028to MBX mailboxes), but called libraries such as DBM libraries may require them.
3029If TMPDIR is found in the environment, reset it to the value defined in the
3030TMPDIR macro, if this macro is defined. */
3031
3032#ifdef TMPDIR
3033 {
3034 uschar **p;
3035 for (p = USS environ; *p != NULL; p++)
3036 {
3037 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3038 Ustrcmp(*p+7, TMPDIR) != 0)
3039 {
3040 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3041 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3042 *p = newp;
3043 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3044 }
3045 }
3046 }
3047#endif
3048
3049/* Timezone handling. If timezone_string is "utc", set a flag to cause all
3050timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3051we may need to get rid of a bogus timezone setting. This can arise when Exim is
3052called by a user who has set the TZ variable. This then affects the timestamps
3053in log files and in Received: headers, and any created Date: header lines. The
3054required timezone is settable in the configuration file, so nothing can be done
3055about this earlier - but hopefully nothing will normally be logged earlier than
3056this. We have to make a new environment if TZ is wrong, but don't bother if
3057timestamps_utc is set, because then all times are in UTC anyway. */
3058
3059if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3060 {
3061 timestamps_utc = TRUE;
3062 }
3063else
3064 {
3065 uschar *envtz = US getenv("TZ");
3066 if ((envtz == NULL && timezone_string != NULL) ||
3067 (envtz != NULL &&
3068 (timezone_string == NULL ||
3069 Ustrcmp(timezone_string, envtz) != 0)))
3070 {
3071 uschar **p = USS environ;
3072 uschar **new;
3073 uschar **newp;
3074 int count = 0;
3075 while (*p++ != NULL) count++;
3076 if (envtz == NULL) count++;
3077 newp = new = malloc(sizeof(uschar *) * (count + 1));
3078 for (p = USS environ; *p != NULL; p++)
3079 {
3080 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3081 *newp++ = *p;
3082 }
3083 if (timezone_string != NULL)
3084 {
3085 *newp = malloc(Ustrlen(timezone_string) + 4);
3086 sprintf(CS *newp++, "TZ=%s", timezone_string);
3087 }
3088 *newp = NULL;
3089 environ = CSS new;
3090 tzset();
3091 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3092 tod_stamp(tod_log));
3093 }
3094 }
3095
3096/* Handle the case when we have removed the setuid privilege because of -C or
3097-D. This means that the caller of Exim was not root, and, provided that
3098ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3099the binary.
3100
3101If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3102were running as the exim user defined in the configuration file (different to
3103the one in the binary). The sysadmin may expect this case to retain privilege
3104because "the binary was called by the Exim user", but it hasn't, because of the
3105order in which it handles this stuff. There are two possibilities:
3106
3107 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3108 to do message deliveries. Thus, the fact that it is running as a
3109 non-privileged user is plausible, and might be wanted in some special
3110 configurations. However, really_exim will have been set false when
3111 privilege was dropped, to stop Exim trying to write to its normal log
3112 files. Therefore, re-enable normal log processing, assuming the sysadmin
3113 has set up the log directory correctly.
3114
3115 (2) If deliver_drop_privilege is not set, the configuration won't work as
3116 apparently intended, and so we log a panic message. In order to retain
3117 root for -C or -D, the caller must either be root or the Exim user
3118 defined in the binary (when deliver_drop_ privilege is false).
3119
3120If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3121built-in exim user or one defined in the configuration. In either event,
3122re-enable log processing, assuming the sysadmin knows what they are doing. */
3123
3124if (removed_privilege && (config_changed || macros != NULL) &&
3125 real_uid == exim_uid)
3126 {
3127 #ifdef ALT_CONFIG_ROOT_ONLY
3128 really_exim = TRUE; /* let logging work normally */
3129 #else
3130
3131 if (deliver_drop_privilege)
3132 really_exim = TRUE; /* let logging work normally */
3133 else
3134 log_write(0, LOG_MAIN|LOG_PANIC,
3135 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3136 (int)exim_uid, config_changed? "-C" : "-D");
3137 #endif
3138 }
3139
3140/* Start up Perl interpreter if Perl support is configured and there is a
3141perl_startup option, and the configuration or the command line specifies
3142initializing starting. Note that the global variables are actually called
3143opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3144
3145#ifdef EXIM_PERL
3146if (perl_start_option != 0)
3147 opt_perl_at_start = (perl_start_option > 0);
3148if (opt_perl_at_start && opt_perl_startup != NULL)
3149 {
3150 uschar *errstr;
3151 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3152 errstr = init_perl(opt_perl_startup);
3153 if (errstr != NULL)
3154 {
3155 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3156 return EXIT_FAILURE;
3157 }
3158 opt_perl_started = TRUE;
3159 }
3160#endif /* EXIM_PERL */
3161
3162/* Log the arguments of the call if the configuration file said so. This is
3163a debugging feature for finding out what arguments certain MUAs actually use.
3164Don't attempt it if logging is disabled, or if listing variables or if
3165verifying/testing addresses or expansions. */
3166
3167if ((log_extra_selector & LX_arguments) != 0 && really_exim
3168 && !list_options && !checking)
3169 {
3170 int i;
3171 uschar *p = big_buffer;
3172 Ustrcpy(p, "cwd=");
3173 (void)getcwd(CS p+4, big_buffer_size - 4);
3174 while (*p) p++;
3175 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3176 while (*p) p++;
3177 for (i = 0; i < argc; i++)
3178 {
3179 int len = Ustrlen(argv[i]);
3180 uschar *printing;
3181 uschar *quote;
3182 if (p + len + 8 >= big_buffer + big_buffer_size)
3183 {
3184 Ustrcpy(p, " ...");
3185 log_write(0, LOG_MAIN, "%s", big_buffer);
3186 Ustrcpy(big_buffer, "...");
3187 p = big_buffer + 3;
3188 }
3189 printing = string_printing(argv[i]);
3190 if (printing[0] == 0) quote = US"\""; else
3191 {
3192 uschar *pp = printing;
3193 quote = US"";
3194 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3195 }
3196 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3197 (p - big_buffer) - 4), printing, quote);
3198 while (*p) p++;
3199 }
3200 log_write(0, LOG_MAIN, "%s", big_buffer);
3201 }
3202
3203/* Set the working directory to be the top-level spool directory. We don't rely
3204on this in the code, which always uses fully qualified names, but it's useful
3205for core dumps etc. Don't complain if it fails - the spool directory might not
3206be generally accessible and calls with the -C option (and others) have lost
3207privilege by now. */
3208
3209if (Uchdir(spool_directory) != 0)
3210 {
3211 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3212 (void)Uchdir(spool_directory);
3213 }
3214
3215/* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3216alias file. Exim doesn't have such a concept, but this call is screwed into
3217Sun's YP makefiles. Handle this by calling a configured script, as the real
3218user who called Exim. The -oA option can be used to pass an argument to the
3219script. */
3220
3221if (bi_option)
3222 {
3223 fclose(config_file);
3224 if (bi_command != NULL)
3225 {
3226 int i = 0;
3227 uschar *argv[3];
3228 argv[i++] = bi_command;
3229 if (alias_arg != NULL) argv[i++] = alias_arg;
3230 argv[i++] = NULL;
3231
3232 setgroups(group_count, group_list);
3233 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3234
3235 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3236 (argv[1] == NULL)? US"" : argv[1]);
3237
3238 execv(CS argv[0], (char *const *)argv);
3239 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3240 exit(EXIT_FAILURE);
3241 }
3242 else
3243 {
3244 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3245 exit(EXIT_SUCCESS);
3246 }
3247 }
3248
3249/* If an action on specific messages is requested, or if a daemon or queue
3250runner is being started, we need to know if Exim was called by an admin user.
3251This is the case if the real user is root or exim, or if the real group is
3252exim, or if one of the supplementary groups is exim or a group listed in
3253admin_groups. We don't fail all message actions immediately if not admin_user,
3254since some actions can be performed by non-admin users. Instead, set admin_user
3255for later interrogation. */
3256
3257if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3258 admin_user = TRUE;
3259else
3260 {
3261 int i, j;
3262
3263 for (i = 0; i < group_count; i++)
3264 {
3265 if (group_list[i] == exim_gid) admin_user = TRUE;
3266 else if (admin_groups != NULL)
3267 {
3268 for (j = 1; j <= (int)(admin_groups[0]); j++)
3269 if (admin_groups[j] == group_list[i])
3270 { admin_user = TRUE; break; }
3271 }
3272 if (admin_user) break;
3273 }
3274 }
3275
3276/* Another group of privileged users are the trusted users. These are root,
3277exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3278are permitted to specify sender_addresses with -f on the command line, and
3279other message parameters as well. */
3280
3281if (real_uid == root_uid || real_uid == exim_uid)
3282 trusted_caller = TRUE;
3283else
3284 {
3285 int i, j;
3286
3287 if (trusted_users != NULL)
3288 {
3289 for (i = 1; i <= (int)(trusted_users[0]); i++)
3290 if (trusted_users[i] == real_uid)
3291 { trusted_caller = TRUE; break; }
3292 }
3293
3294 if (!trusted_caller && trusted_groups != NULL)
3295 {
3296 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3297 {
3298 if (trusted_groups[i] == real_gid)
3299 trusted_caller = TRUE;
3300 else for (j = 0; j < group_count; j++)
3301 {
3302 if (trusted_groups[i] == group_list[j])
3303 { trusted_caller = TRUE; break; }
3304 }
3305 if (trusted_caller) break;
3306 }
3307 }
3308 }
3309
3310if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3311if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3312
3313/* Only an admin user may start the daemon or force a queue run in the default
3314configuration, but the queue run restriction can be relaxed. Only an admin
3315user may request that a message be returned to its sender forthwith. Only an
3316admin user may specify a debug level greater than D_v (because it might show
3317passwords, etc. in lookup queries). Only an admin user may request a queue
3318count. */
3319
3320if (!admin_user)
3321 {
3322 BOOL debugset = (debug_selector & ~D_v) != 0;
3323 if (deliver_give_up || daemon_listen ||
3324 (count_queue && queue_list_requires_admin) ||
3325 (list_queue && queue_list_requires_admin) ||
3326 (queue_interval >= 0 && prod_requires_admin) ||
3327 (debugset && !running_in_test_harness))
3328 {
3329 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3330 exit(EXIT_FAILURE);
3331 }
3332 }
3333
3334/* If the real user is not root or the exim uid, the argument for passing
3335in an open TCP/IP connection for another message is not permitted, nor is
3336running with the -N option for any delivery action, unless this call to exim is
3337one that supplied an input message, or we are using a patched exim for
3338regression testing. */
3339
3340if (real_uid != root_uid && real_uid != exim_uid &&
3341 (continue_hostname != NULL ||
3342 (dont_deliver &&
3343 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3344 )) && !running_in_test_harness)
3345 {
3346 fprintf(stderr, "exim: Permission denied\n");
3347 return EXIT_FAILURE;
3348 }
3349
3350/* If the caller is not trusted, certain arguments are ignored when running for
3351real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf). Note
3352that authority for performing certain actions on messages is tested in the
3353queue_action() function. */
3354
3355if (!trusted_caller && !checking && filter_test == NULL)
3356 {
3357 sender_host_name = sender_host_address = interface_address =
3358 sender_ident = received_protocol = NULL;
3359 sender_host_port = interface_port = 0;
3360 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3361 }
3362
3363/* If a sender host address is set, extract the optional port number off the
3364end of it and check its syntax. Do the same thing for the interface address.
3365Exim exits if the syntax is bad. */
3366
3367else
3368 {
3369 if (sender_host_address != NULL)
3370 sender_host_port = check_port(sender_host_address);
3371 if (interface_address != NULL)
3372 interface_port = check_port(interface_address);
3373 }
3374
3375/* If an SMTP message is being received check to see if the standard input is a
3376TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3377caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3378barf. */
3379
3380if (smtp_input)
3381 {
3382 union sockaddr_46 inetd_sock;
3383 SOCKLEN_T size = sizeof(inetd_sock);
3384 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3385 {
3386 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3387 if (family == AF_INET || family == AF_INET6)
3388 {
3389 union sockaddr_46 interface_sock;
3390 size = sizeof(interface_sock);
3391
3392 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3393 interface_address = host_ntoa(-1, &interface_sock, NULL,
3394 &interface_port);
3395
3396 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3397
3398 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3399 {
3400 is_inetd = TRUE;
3401 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3402 NULL, &sender_host_port);
3403 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3404 "inetd is not supported when mua_wrapper is set");
3405 }
3406 else
3407 {
3408 fprintf(stderr,
3409 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3410 return EXIT_FAILURE;
3411 }
3412 }
3413 }
3414 }
3415
3416/* If the load average is going to be needed while receiving a message, get it
3417now for those OS that require the first call to os_getloadavg() to be done as
3418root. There will be further calls later for each message received. */
3419
3420#ifdef LOAD_AVG_NEEDS_ROOT
3421if (receiving_message &&
3422 (queue_only_load >= 0 ||
3423 (is_inetd && smtp_load_reserve >= 0)
3424 ))
3425 {
3426 load_average = os_getloadavg();
3427 }
3428#endif
3429
3430/* The queue_only configuration option can be overridden by -odx on the command
3431line, except that if queue_only_override is false, queue_only cannot be unset
3432from the command line. */
3433
3434if (queue_only_set && (queue_only_override || arg_queue_only))
3435 queue_only = arg_queue_only;
3436
3437/* The receive_timeout and smtp_receive_timeout options can be overridden by
3438-or and -os. */
3439
3440if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3441if (arg_smtp_receive_timeout >= 0)
3442 smtp_receive_timeout = arg_smtp_receive_timeout;
3443
3444/* If Exim was started with root privilege, unless we have already removed the
3445root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3446except when starting the daemon or doing some kind of delivery or address
3447testing (-bt). These are the only cases when root need to be retained. We run
3448as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3449retained only for starting the daemon. */
3450
3451if (!unprivileged && /* originally had root AND */
3452 !removed_privilege && /* still got root AND */
3453 !daemon_listen && /* not starting the daemon */
3454 queue_interval <= 0 && /* (either kind of daemon) */
3455 ( /* AND EITHER */
3456 deliver_drop_privilege || /* requested unprivileged */
3457 ( /* OR */
3458 queue_interval < 0 && /* not running the queue */
3459 (msg_action_arg < 0 || /* and */
3460 msg_action != MSG_DELIVER) && /* not delivering and */
3461 (!checking || !address_test_mode) /* not address checking */
3462 )
3463 ))
3464 {
3465 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3466 }
3467
3468/* When we are retaining a privileged uid, we still change to the exim gid. */
3469
3470else setgid(exim_gid);
3471
3472/* Handle a request to list the delivery queue */
3473
3474if (list_queue)
3475 {
3476 set_process_info("listing the queue");
3477 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3478 exit(EXIT_SUCCESS);
3479 }
3480
3481/* Handle a request to count the delivery queue */
3482
3483if (count_queue)
3484 {
3485 set_process_info("counting the queue");
3486 queue_count();
3487 exit(EXIT_SUCCESS);
3488 }
3489
3490/* Handle actions on specific messages, except for the force delivery action,
3491which is done below. Some actions take a whole list of message ids, which
3492are known to continue up to the end of the arguments. Others take a single
3493message id and then operate on the recipients list. */
3494
3495if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3496 {
3497 int yield = EXIT_SUCCESS;
3498 set_process_info("acting on specified messages");
3499
3500 if (!one_msg_action)
3501 {
3502 for (i = msg_action_arg; i < argc; i++)
3503 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3504 yield = EXIT_FAILURE;
3505 }
3506
3507 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3508 recipients_arg)) yield = EXIT_FAILURE;
3509 exit(yield);
3510 }
3511
3512/* All the modes below here require the remaining configuration sections
3513to be read, except that we can skip over the ACL setting when delivering
3514specific messages, or doing a queue run. (For various testing cases we could
3515skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3516for skipping. */
3517
3518readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3519
3520/* The configuration data will have been read into POOL_PERM because we won't
3521ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3522this is just a bit of pedantic tidiness. It wouldn't really matter if the
3523configuration were read into POOL_MAIN, because we don't do any resets till
3524later on. However, it seems right, and it does ensure that both pools get used.
3525*/
3526
3527store_pool = POOL_MAIN;
3528
3529/* Handle the -brt option. This is for checking out retry configurations.
3530The next three arguments are a domain name or a complete address, and
3531optionally two error numbers. All it does is to call the function that
3532scans the retry configuration data. */
3533
3534if (test_retry_arg >= 0)
3535 {
3536 retry_config *yield;
3537 int basic_errno = 0;
3538 int more_errno = 0;
3539 uschar *s1, *s2;
3540
3541 if (test_retry_arg >= argc)
3542 {
3543 printf("-brt needs a domain or address argument\n");
3544 exim_exit(EXIT_FAILURE);
3545 }
3546 s1 = argv[test_retry_arg++];
3547 s2 = NULL;
3548
3549 /* If the first argument contains no @ and no . it might be a local user
3550 or it might be a single-component name. Treat as a domain. */
3551
3552 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3553 {
3554 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3555 "being \ntreated as a one-component domain, not as a local part.\n\n",
3556 s1);
3557 }
3558
3559 /* There may be an optional second domain arg. */
3560
3561 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3562 s2 = argv[test_retry_arg++];
3563
3564 /* The final arg is an error name */
3565
3566 if (test_retry_arg < argc)
3567 {
3568 uschar *ss = argv[test_retry_arg];
3569 uschar *error =
3570 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3571 if (error != NULL)
3572 {
3573 printf("%s\n", CS error);
3574 return EXIT_FAILURE;
3575 }
3576
3577 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3578 an error is for matching codes to the decade. Turn them into a real error
3579 code, off the decade. */
3580
3581 if (basic_errno == ERRNO_RCPT4XX)
3582 {
3583 int code = (more_errno >> 8) & 255;
3584 if (code == 255)
3585 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3586 else if (code > 100)
3587 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3588 }
3589 }
3590
3591 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3592 if (yield == NULL) printf("No retry information found\n"); else
3593 {
3594 retry_rule *r;
3595 more_errno = yield->more_errno;
3596 printf("Retry rule: %s ", yield->pattern);
3597
3598 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3599 {
3600 printf("quota%s%s ",
3601 (more_errno > 0)? "_" : "",
3602 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3603 }
3604 else if (yield->basic_errno == ECONNREFUSED)
3605 {
3606 printf("refused%s%s ",
3607 (more_errno > 0)? "_" : "",
3608 (more_errno == 'M')? "MX" :
3609 (more_errno == 'A')? "A" : "");
3610 }
3611 else if (yield->basic_errno == ETIMEDOUT)
3612 {
3613 printf("timeout");
3614 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3615 more_errno &= 255;
3616 if (more_errno != 0) printf("_%s",
3617 (more_errno == 'M')? "MX" : "A");
3618 printf(" ");
3619 }
3620 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3621 printf("auth_failed ");
3622 else printf("* ");
3623
3624 for (r = yield->rules; r != NULL; r = r->next)
3625 {
3626 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3627 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3628 if (r->rule == 'G')
3629 {
3630 int x = r->p2;
3631 int f = x % 1000;
3632 int d = 100;
3633 printf(",%d.", x/1000);
3634 do
3635 {
3636 printf("%d", f/d);
3637 f %= d;
3638 d /= 10;
3639 }
3640 while (f != 0);
3641 }
3642 printf("; ");
3643 }
3644
3645 printf("\n");
3646 }
3647 exim_exit(EXIT_SUCCESS);
3648 }
3649
3650/* Handle a request to list one or more configuration options */
3651
3652if (list_options)
3653 {
3654 set_process_info("listing variables");
3655 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3656 else for (i = recipients_arg; i < argc; i++)
3657 {
3658 if (i < argc - 1 &&
3659 (Ustrcmp(argv[i], "router") == 0 ||
3660 Ustrcmp(argv[i], "transport") == 0 ||
3661 Ustrcmp(argv[i], "authenticator") == 0))
3662 {
3663 readconf_print(argv[i+1], argv[i]);
3664 i++;
3665 }
3666 else readconf_print(argv[i], NULL);
3667 }
3668 exim_exit(EXIT_SUCCESS);
3669 }
3670
3671
3672/* Handle a request to deliver one or more messages that are already on the
3673queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3674is typically used for a small number when prodding by hand (when the option
3675forced_delivery will be set) or when re-execing to regain root privilege.
3676Each message delivery must happen in a separate process, so we fork a process
3677for each one, and run them sequentially so that debugging output doesn't get
3678intertwined, and to avoid spawning too many processes if a long list is given.
3679However, don't fork for the last one; this saves a process in the common case
3680when Exim is called to deliver just one message. */
3681
3682if (msg_action_arg > 0)
3683 {
3684 if (prod_requires_admin && !admin_user)
3685 {
3686 fprintf(stderr, "exim: Permission denied\n");
3687 exim_exit(EXIT_FAILURE);
3688 }
3689 set_process_info("delivering specified messages");
3690 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3691 for (i = msg_action_arg; i < argc; i++)
3692 {
3693 int status;
3694 pid_t pid;
3695 if (i == argc - 1)
3696 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3697 else if ((pid = fork()) == 0)
3698 {
3699 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3700 _exit(EXIT_SUCCESS);
3701 }
3702 else if (pid < 0)
3703 {
3704 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3705 strerror(errno));
3706 exim_exit(EXIT_FAILURE);
3707 }
3708 else wait(&status);
3709 }
3710 exim_exit(EXIT_SUCCESS);
3711 }
3712
3713
3714/* If only a single queue run is requested, without SMTP listening, we can just
3715turn into a queue runner, with an optional starting message id. */
3716
3717if (queue_interval == 0 && !daemon_listen)
3718 {
3719 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3720 (start_queue_run_id == NULL)? US"" : US" starting at ",
3721 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3722 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3723 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3724 set_process_info("running the queue (single queue run)");
3725 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3726 exim_exit(EXIT_SUCCESS);
3727 }
3728
3729
3730/* Find the login name of the real user running this process. This is always
3731needed when receiving a message, because it is written into the spool file. It
3732may also be used to construct a from: or a sender: header, and in this case we
3733need the user's full name as well, so save a copy of it, checked for RFC822
3734syntax and munged if necessary, if it hasn't previously been set by the -F
3735argument. We may try to get the passwd entry more than once, in case NIS or
3736other delays are in evidence. Save the home directory for use in filter testing
3737(only). */
3738
3739for (i = 0;;)
3740 {
3741 if ((pw = getpwuid(real_uid)) != NULL)
3742 {
3743 originator_login = string_copy(US pw->pw_name);
3744 originator_home = string_copy(US pw->pw_dir);
3745
3746 /* If user name has not been set by -F, set it from the passwd entry
3747 unless -f has been used to set the sender address by a trusted user. */
3748
3749 if (originator_name == NULL)
3750 {
3751 if (sender_address == NULL ||
3752 (!trusted_caller && filter_test == NULL))
3753 {
3754 uschar *name = US pw->pw_gecos;
3755 uschar *amp = Ustrchr(name, '&');
3756 uschar buffer[256];
3757
3758 /* Most Unix specify that a '&' character in the gecos field is
3759 replaced by a copy of the login name, and some even specify that
3760 the first character should be upper cased, so that's what we do. */
3761
3762 if (amp != NULL)
3763 {
3764 int loffset;
3765 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3766 amp - name, name, &loffset, originator_login, amp + 1);
3767 buffer[loffset] = toupper(buffer[loffset]);
3768 name = buffer;
3769 }
3770
3771 /* If a pattern for matching the gecos field was supplied, apply
3772 it and then expand the name string. */
3773
3774 if (gecos_pattern != NULL && gecos_name != NULL)
3775 {
3776 const pcre *re;
3777 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3778
3779 if (regex_match_and_setup(re, name, 0, -1))
3780 {
3781 uschar *new_name = expand_string(gecos_name);
3782 expand_nmax = -1;
3783 if (new_name != NULL)
3784 {
3785 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3786 "gecos field \"%s\"\n", new_name, name);
3787 name = new_name;
3788 }
3789 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3790 "\"%s\": %s\n", gecos_name, expand_string_message);
3791 }
3792 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3793 "gecos field \"%s\"\n", gecos_pattern, name);
3794 store_free((void *)re);
3795 }
3796 originator_name = string_copy(name);
3797 }
3798
3799 /* A trusted caller has used -f but not -F */
3800
3801 else originator_name = US"";
3802 }
3803
3804 /* Break the retry loop */
3805
3806 break;
3807 }
3808
3809 if (++i > finduser_retries) break;
3810 sleep(1);
3811 }
3812
3813/* If we cannot get a user login, log the incident and give up, unless the
3814configuration specifies something to use. When running in the test harness,
3815any setting of unknown_login overrides the actual login name. */
3816
3817if (originator_login == NULL || running_in_test_harness)
3818 {
3819 if (unknown_login != NULL)
3820 {
3821 originator_login = expand_string(unknown_login);
3822 if (originator_name == NULL && unknown_username != NULL)
3823 originator_name = expand_string(unknown_username);
3824 if (originator_name == NULL) originator_name = US"";
3825 }
3826 if (originator_login == NULL)
3827 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3828 (int)real_uid);
3829 }
3830
3831/* Ensure that the user name is in a suitable form for use as a "phrase" in an
3832RFC822 address.*/
3833
3834originator_name = string_copy(parse_fix_phrase(originator_name,
3835 Ustrlen(originator_name), big_buffer, big_buffer_size));
3836
3837/* If a message is created by this call of Exim, the uid/gid of its originator
3838are those of the caller. These values are overridden if an existing message is
3839read in from the spool. */
3840
3841originator_uid = real_uid;
3842originator_gid = real_gid;
3843
3844DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3845 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3846
3847/* Run in daemon and/or queue-running mode. The function daemon_go() never
3848returns. We leave this till here so that the originator_ fields are available
3849for incoming messages via the daemon. */
3850
3851if (daemon_listen || queue_interval > 0)
3852 {
3853 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3854 "run when mua_wrapper is set");
3855 daemon_go();
3856 }
3857
3858/* If the sender ident has not been set (by a trusted caller) set it to
3859the caller. This will get overwritten below for an inetd call. If a trusted
3860caller has set it empty, unset it. */
3861
3862if (sender_ident == NULL) sender_ident = originator_login;
3863 else if (sender_ident[0] == 0) sender_ident = NULL;
3864
3865/* Handle the -brw option, which is for checking out rewriting rules. Cause log
3866writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3867originator_* variables set. */
3868
3869if (test_rewrite_arg >= 0)
3870 {
3871 really_exim = FALSE;
3872 if (test_rewrite_arg >= argc)
3873 {
3874 printf("-brw needs an address argument\n");
3875 exim_exit(EXIT_FAILURE);
3876 }
3877 rewrite_test(argv[test_rewrite_arg]);
3878 exim_exit(EXIT_SUCCESS);
3879 }
3880
3881/* A locally-supplied message is considered to be coming from a local user
3882unless a trusted caller supplies a sender address with -f, or is passing in the
3883message via SMTP (inetd invocation or otherwise). */
3884
3885if ((sender_address == NULL && !smtp_input) ||
3886 (!trusted_caller && filter_test == NULL))
3887 {
3888 sender_local = TRUE;
3889
3890 /* A trusted caller can supply authenticated_sender and authenticated_id
3891 via -oMas and -oMai and if so, they will already be set. */
3892
3893 if (authenticated_sender == NULL)
3894 authenticated_sender = string_sprintf("%s@%s", originator_login,
3895 qualify_domain_sender);
3896 if (authenticated_id == NULL) authenticated_id = originator_login;
3897 }
3898
3899/* Trusted callers are always permitted to specify the sender address.
3900Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3901is specified is the empty address. However, if a trusted caller does not
3902specify a sender address for SMTP input, we leave sender_address unset. This
3903causes the MAIL commands to be honoured. */
3904
3905if ((!smtp_input && sender_address == NULL) ||
3906 !receive_check_set_sender(sender_address))
3907 {
3908 /* Either the caller is not permitted to set a general sender, or this is
3909 non-SMTP input and the trusted caller has not set a sender. If there is no
3910 sender, or if a sender other than <> is set, override with the originator's
3911 login (which will get qualified below), except when checking things. */
3912
3913 if (sender_address == NULL /* No sender_address set */
3914 || /* OR */
3915 (sender_address[0] != 0 && /* Non-empty sender address, AND */
3916 !checking && /* Not running tests, AND */
3917 filter_test == NULL)) /* Not testing a filter */
3918 {
3919 sender_address = originator_login;
3920 sender_address_forced = FALSE;
3921 sender_address_domain = 0;
3922 }
3923 }
3924
3925/* Remember whether an untrusted caller set the sender address */
3926
3927sender_set_untrusted = sender_address != originator_login && !trusted_caller;
3928
3929/* Ensure that the sender address is fully qualified unless it is the empty
3930address, which indicates an error message, or doesn't exist (root caller, smtp
3931interface, no -f argument). */
3932
3933if (sender_address != NULL && sender_address[0] != 0 &&
3934 sender_address_domain == 0)
3935 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
3936 qualify_domain_sender);
3937
3938DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
3939
3940/* Handle a request to verify a list of addresses, or test them for delivery.
3941This must follow the setting of the sender address, since routers can be
3942predicated upon the sender. If no arguments are given, read addresses from
3943stdin. Set debug_level to at least D_v to get full output for address testing.
3944*/
3945
3946if (verify_address_mode || address_test_mode)
3947 {
3948 int exit_value = 0;
3949 int flags = vopt_qualify;
3950
3951 if (verify_address_mode)
3952 {
3953 if (!verify_as_sender) flags |= vopt_is_recipient;
3954 DEBUG(D_verify) debug_print_ids(US"Verifying:");
3955 }
3956
3957 else
3958 {
3959 flags |= vopt_is_recipient;
3960 debug_selector |= D_v;
3961 debug_file = stderr;
3962 debug_fd = fileno(debug_file);
3963 DEBUG(D_verify) debug_print_ids(US"Address testing:");
3964 }
3965
3966 if (recipients_arg < argc)
3967 {
3968 while (recipients_arg < argc)
3969 {
3970 uschar *s = argv[recipients_arg++];
3971 while (*s != 0)
3972 {
3973 BOOL finished = FALSE;
3974 uschar *ss = parse_find_address_end(s, FALSE);
3975 if (*ss == ',') *ss = 0; else finished = TRUE;
3976 test_address(s, flags, &exit_value);
3977 s = ss;
3978 if (!finished)
3979 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
3980 }
3981 }
3982 }
3983
3984 else for (;;)
3985 {
3986 uschar *s = get_stdinput(NULL, NULL);
3987 if (s == NULL) break;
3988 test_address(s, flags, &exit_value);
3989 }
3990
3991 route_tidyup();
3992 exim_exit(exit_value);
3993 }
3994
3995/* Handle expansion checking */
3996
3997if (expansion_test)
3998 {
3999 if (recipients_arg < argc)
4000 {
4001 while (recipients_arg < argc)
4002 {
4003 uschar *s = argv[recipients_arg++];
4004 uschar *ss = expand_string(s);
4005 if (ss == NULL)
4006 printf ("Failed: %s\n", expand_string_message);
4007 else printf("%s\n", CS ss);
4008 }
4009 }
4010
4011 /* Read stdin */
4012
4013 else
4014 {
4015 char *(*fn_readline)(char *) = NULL;
4016 char *(*fn_addhist)(char *) = NULL;
4017
4018 #ifdef USE_READLINE
4019 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4020 #endif
4021
4022 for (;;)
4023 {
4024 uschar *ss;
4025 uschar *source = get_stdinput(fn_readline, fn_addhist);
4026 if (source == NULL) break;
4027 ss = expand_string(source);
4028 if (ss == NULL)
4029 printf ("Failed: %s\n", expand_string_message);
4030 else printf("%s\n", CS ss);
4031 }
4032
4033 #ifdef USE_READLINE
4034 if (dlhandle != NULL) dlclose(dlhandle);
4035 #endif
4036 }
4037
4038 exim_exit(EXIT_SUCCESS);
4039 }
4040
4041
4042/* The active host name is normally the primary host name, but it can be varied
4043for hosts that want to play several parts at once. We need to ensure that it is
4044set for host checking, and for receiving messages. */
4045
4046smtp_active_hostname = primary_hostname;
4047if (raw_active_hostname != NULL)
4048 {
4049 uschar *nah = expand_string(raw_active_hostname);
4050 if (nah == NULL)
4051 {
4052 if (!expand_string_forcedfail)
4053 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4054 "(smtp_active_hostname): %s", raw_active_hostname,
4055 expand_string_message);
4056 }
4057 else if (nah[0] != 0) smtp_active_hostname = nah;
4058 }
4059
4060/* Handle host checking: this facility mocks up an incoming SMTP call from a
4061given IP address so that the blocking and relay configuration can be tested. An
4062RFC 1413 call is made only if we are running in the test harness and an
4063incoming interface and both ports are specified, because there is no TCP/IP
4064call to find the ident for. */
4065
4066if (host_checking)
4067 {
4068 sender_ident = NULL;
4069 if (running_in_test_harness && sender_host_port != 0 &&
4070 interface_address != NULL && interface_port != 0)
4071 verify_get_ident(1413);
4072
4073 host_build_sender_fullhost();
4074 smtp_input = TRUE;
4075 smtp_in = stdin;
4076 smtp_out = stdout;
4077 sender_local = FALSE;
4078 sender_host_notsocket = TRUE;
4079 debug_file = stderr;
4080 debug_fd = fileno(debug_file);
4081 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4082 "**** but without any ident (RFC 1413) callback.\n"
4083 "**** This is not for real!\n\n",
4084 sender_host_address);
4085
4086 if (verify_check_host(&hosts_connection_nolog) == OK)
4087 log_write_selector &= ~L_smtp_connection;
4088 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4089
4090 if (smtp_start_session())
4091 {
4092 reset_point = store_get(0);
4093 for (;;)
4094 {
4095 store_reset(reset_point);
4096 if (smtp_setup_msg() <= 0) break;
4097 if (!receive_msg(FALSE)) break;
4098 }
4099 }
4100 exim_exit(EXIT_SUCCESS);
4101 }
4102
4103
4104/* Arrange for message reception if recipients or SMTP were specified;
4105otherwise complain unless a version print (-bV) happened or this is a filter
4106verification test. In the former case, show the configuration file name. */
4107
4108if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4109 {
4110 if (version_printed)
4111 {
4112 printf("Configuration file is %s\n", config_main_filename);
4113 return EXIT_SUCCESS;
4114 }
4115 if (filter_test == NULL)
4116 {
4117 fprintf(stderr,
4118"Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4119"not directly from a shell command line. Options and/or arguments control\n"
4120"what it does when called. For a list of options, see the Exim documentation.\n");
4121 return EXIT_FAILURE;
4122 }
4123 }
4124
4125
4126/* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4127standard input into an MUA that submits to a smarthost over TCP/IP. We know
4128that we are not called from inetd, because that is rejected above. The
4129following configuration settings are forced here:
4130
4131 (1) Synchronous delivery (-odi)
4132 (2) Errors to stderr (-oep == -oeq)
4133 (3) No parallel remote delivery
4134 (4) Unprivileged delivery
4135
4136We don't force overall queueing options because there are several of them;
4137instead, queueing is avoided below when mua_wrapper is set. However, we do need
4138to override any SMTP queueing. */
4139
4140if (mua_wrapper)
4141 {
4142 synchronous_delivery = TRUE;
4143 arg_error_handling = ERRORS_STDERR;
4144 remote_max_parallel = 1;
4145 deliver_drop_privilege = TRUE;
4146 queue_smtp = FALSE;
4147 queue_smtp_domains = NULL;
4148 }
4149
4150
4151/* Prepare to accept one or more new messages on the standard input. When a
4152message has been read, its id is returned in message_id[]. If doing immediate
4153delivery, we fork a delivery process for each received message, except for the
4154last one, where we can save a process switch.
4155
4156It is only in non-smtp mode that error_handling is allowed to be changed from
4157its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4158sendmail error modes other than -oem ever actually used? Later: yes.) */
4159
4160if (!smtp_input) error_handling = arg_error_handling;
4161
4162/* If this is an inetd call, ensure that stderr is closed to prevent panic
4163logging being sent down the socket and make an identd call to get the
4164sender_ident. */
4165
4166else if (is_inetd)
4167 {
4168 fclose(stderr);
4169 exim_nullstd(); /* Re-open to /dev/null */
4170 verify_get_ident(IDENT_PORT);
4171 host_build_sender_fullhost();
4172 set_process_info("handling incoming connection from %s via inetd",
4173 sender_fullhost);
4174 }
4175
4176/* If the sender host address has been set, build sender_fullhost if it hasn't
4177already been done (which it will have been for inetd). This caters for the
4178case when it is forced by -oMa. However, we must flag that it isn't a socket,
4179so that the test for IP options is skipped for -bs input. */
4180
4181if (sender_host_address != NULL && sender_fullhost == NULL)
4182 {
4183 host_build_sender_fullhost();
4184 set_process_info("handling incoming connection from %s via -oMa",
4185 sender_fullhost);
4186 sender_host_notsocket = TRUE;
4187 }
4188
4189/* Otherwise, set the sender host as unknown except for inetd calls. This
4190prevents host checking in the case of -bs not from inetd and also for -bS. */
4191
4192else if (!is_inetd) sender_host_unknown = TRUE;
4193
4194/* If stdout does not exist, then dup stdin to stdout. This can happen
4195if exim is started from inetd. In this case fd 0 will be set to the socket,
4196but fd 1 will not be set. This also happens for passed SMTP channels. */
4197
4198if (fstat(1, &statbuf) < 0) dup2(0, 1);
4199
4200/* Set up the incoming protocol name and the state of the program. Root
4201is allowed to force received protocol via the -oMr option above, and if we are
4202in a non-local SMTP state it means we have come via inetd and the process info
4203has already been set up. We don't set received_protocol here for smtp input,
4204as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4205
4206if (smtp_input)
4207 {
4208 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4209 sender_address);
4210 }
4211else
4212 {
4213 if (received_protocol == NULL)
4214 received_protocol = string_sprintf("local%s", called_as);
4215 set_process_info("accepting a local non-SMTP message from <%s>",
4216 sender_address);
4217 }
4218
4219/* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4220set) */
4221
4222queue_check_only();
4223local_queue_only = queue_only;
4224
4225/* For non-SMTP and for batched SMTP input, check that there is enough space on
4226the spool if so configured. On failure, we must not attempt to send an error
4227message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4228error code is given.) */
4229
4230if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4231 {
4232 fprintf(stderr, "exim: insufficient disk space\n");
4233 return EXIT_FAILURE;
4234 }
4235
4236/* If this is smtp input of any kind, handle the start of the SMTP
4237session. */
4238
4239if (smtp_input)
4240 {
4241 smtp_in = stdin;
4242 smtp_out = stdout;
4243 if (verify_check_host(&hosts_connection_nolog) == OK)
4244 log_write_selector &= ~L_smtp_connection;
4245 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4246 if (!smtp_start_session())
4247 {
4248 mac_smtp_fflush();
4249 exim_exit(EXIT_SUCCESS);
4250 }
4251 }
4252
4253/* Otherwise, set up the input size limit here */
4254
4255else
4256 {
4257 thismessage_size_limit = expand_string_integer(message_size_limit);
4258 if (thismessage_size_limit < 0)
4259 {
4260 if (thismessage_size_limit == -1)
4261 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4262 "message_size_limit: %s", expand_string_message);
4263 else
4264 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4265 "message_size_limit: %s", expand_string_message);
4266 }
4267 }
4268
4269/* Loop for several messages when reading SMTP input. If we fork any child
4270processes, we don't want to wait for them unless synchronous delivery is
4271requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4272same as SIG_DFL, despite the fact that documentation often lists the default as
4273"ignore". This is a confusing area. This is what I know:
4274
4275At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4276processes that complete simply to go away without ever becoming defunct. You
4277can't then wait for them - but we don't want to wait for them in