1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 - 2021 */
7 /* See the file NOTICE for conditions of use and distribution. */
10 /* The main function: entry point, initialization, and high-level control.
11 Also a few functions that don't naturally fit elsewhere. */
16 #if defined(__GLIBC__) && !defined(__UCLIBC__)
17 # include <gnu/libc-version.h>
21 # include <gnutls/gnutls.h>
22 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
31 extern void init_lookup_list(void);
35 /*************************************************
36 * Function interface to store functions *
37 *************************************************/
39 /* We need some real functions to pass to the PCRE regular expression library
40 for store allocation via Exim's store manager. The normal calls are actually
41 macros that pass over location information to make tracing easier. These
42 functions just interface to the standard macro calls. A good compiler will
43 optimize out the tail recursion and so not make them too expensive. */
46 function_store_malloc(PCRE2_SIZE size, void * tag)
48 return store_malloc((int)size);
52 function_store_free(void * block, void * tag)
54 /* At least some version of pcre2 pass a null pointer */
55 if (block) store_free(block);
61 /*************************************************
62 * Enums for cmdline interface *
63 *************************************************/
65 enum commandline_info { CMDINFO_NONE=0,
66 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
71 /*************************************************
72 * Compile regular expression and panic on fail *
73 *************************************************/
75 /* This function is called when failure to compile a regular expression leads
76 to a panic exit. In other cases, pcre_compile() is called directly. In many
77 cases where this function is used, the results of the compilation are to be
78 placed in long-lived store, so we temporarily reset the store management
79 functions that PCRE uses if the use_malloc flag is set.
82 pattern the pattern to compile
83 caseless TRUE if caseless matching is required
84 use_malloc TRUE if compile into malloc store
86 Returns: pointer to the compiled pattern
90 regex_must_compile(const uschar * pattern, BOOL caseless, BOOL use_malloc)
93 int options = caseless ? PCRE_COPT|PCRE2_CASELESS : PCRE_COPT;
94 const pcre2_code * yield;
96 pcre2_general_context * gctx;
97 pcre2_compile_context * cctx;
101 gctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
102 cctx = pcre2_compile_context_create(gctx);
107 if (!(yield = pcre2_compile((PCRE2_SPTR)pattern, PCRE2_ZERO_TERMINATED, options,
108 &err, &offset, cctx)))
111 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
112 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
113 "%s at offset %ld while compiling %s", errbuf, (long)offset, pattern);
118 pcre2_compile_context_free(cctx);
119 pcre2_general_context_free(gctx);
128 pcre_gen_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
129 pcre_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
130 pcre_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
136 /*************************************************
137 * Execute regular expression and set strings *
138 *************************************************/
140 /* This function runs a regular expression match, and sets up the pointers to
141 the matched substrings. The matched strings are copied so the lifetime of
142 the subject is not a problem.
145 re the compiled expression
146 subject the subject string
147 options additional PCRE options
148 setup if < 0 do full setup
149 if >= 0 setup from setup+1 onwards,
150 excluding the full matched string
152 Returns: TRUE if matched, or FALSE
156 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
158 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
159 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
160 PCRE_EOPT | options, md, pcre_mtc_ctx);
163 if ((yield = (res >= 0)))
165 res = pcre2_get_ovector_count(md);
166 expand_nmax = setup < 0 ? 0 : setup + 1;
167 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
170 pcre2_substring_get_bynumber(md, matchnum,
171 (PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len);
172 expand_nlength[expand_nmax++] = (int)len;
176 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
179 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
180 debug_printf_indent("pcre2: %s\n", errbuf);
182 pcre2_match_data_free(md);
187 /* Check just for match with regex. Uses the common memory-handling.
191 subject string to be checked
192 slen length of subject; -1 for nul-terminated
193 rptr pointer for matched string, copied, or NULL
195 Return: TRUE for a match.
199 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
201 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
202 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
203 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
204 0, PCRE_EOPT, md, pcre_mtc_ctx);
205 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
209 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
215 /*************************************************
216 * Set up processing details *
217 *************************************************/
219 /* Save a text string for dumping when SIGUSR1 is received.
220 Do checks for overruns.
222 Arguments: format and arguments, as for printf()
227 set_process_info(const char *format, ...)
229 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
234 g = string_fmt_append(&gs, "%5d ", (int)getpid());
236 va_start(ap, format);
237 if (!string_vformat(g, 0, format, ap))
240 g = string_cat(&gs, US"**** string overflowed buffer ****");
242 g = string_catn(g, US"\n", 1);
243 string_from_gstring(g);
244 process_info_len = g->ptr;
245 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
249 /***********************************************
250 * Handler for SIGTERM *
251 ***********************************************/
254 term_handler(int sig)
260 /***********************************************
261 * Handler for SIGSEGV *
262 ***********************************************/
265 segv_handler(int sig)
267 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
268 signal(SIGSEGV, SIG_DFL);
273 /*************************************************
274 * Handler for SIGUSR1 *
275 *************************************************/
277 /* SIGUSR1 causes any exim process to write to the process log details of
278 what it is currently doing. It will only be used if the OS is capable of
279 setting up a handler that causes automatic restarting of any system call
280 that is in progress at the time.
282 This function takes care to be signal-safe.
284 Argument: the signal number (SIGUSR1)
289 usr1_handler(int sig)
293 os_restarting_signal(sig, usr1_handler);
295 if (!process_log_path) return;
296 fd = log_open_as_exim(process_log_path);
298 /* If we are neither exim nor root, or if we failed to create the log file,
299 give up. There is not much useful we can do with errors, since we don't want
300 to disrupt whatever is going on outside the signal handler. */
304 (void)write(fd, process_info, process_info_len);
310 /*************************************************
312 *************************************************/
314 /* This handler is enabled most of the time that Exim is running. The handler
315 doesn't actually get used unless alarm() has been called to set a timer, to
316 place a time limit on a system call of some kind. When the handler is run, it
319 There are some other SIGALRM handlers that are used in special cases when more
320 than just a flag setting is required; for example, when reading a message's
321 input. These are normally set up in the code module that uses them, and the
322 SIGALRM handler is reset to this one afterwards.
324 Argument: the signal value (SIGALRM)
329 sigalrm_handler(int sig)
332 os_non_restarting_signal(SIGALRM, sigalrm_handler);
337 /*************************************************
338 * Sleep for a fractional time interval *
339 *************************************************/
341 /* This function is called by millisleep() and exim_wait_tick() to wait for a
342 period of time that may include a fraction of a second. The coding is somewhat
343 tedious. We do not expect setitimer() ever to fail, but if it does, the process
344 will wait for ever, so we panic in this instance. (There was a case of this
345 when a bug in a function that calls milliwait() caused it to pass invalid data.
346 That's when I added the check. :-)
348 We assume it to be not worth sleeping for under 50us; this value will
349 require revisiting as hardware advances. This avoids the issue of
350 a zero-valued timer setting meaning "never fire".
352 Argument: an itimerval structure containing the interval
357 milliwait(struct itimerval *itval)
360 sigset_t old_sigmask;
361 int save_errno = errno;
363 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
365 (void)sigemptyset(&sigmask); /* Empty mask */
366 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
367 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
368 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
369 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
370 "setitimer() failed: %s", strerror(errno));
371 (void)sigfillset(&sigmask); /* All signals */
372 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
373 (void)sigsuspend(&sigmask); /* Until SIGALRM */
374 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
376 sigalrm_seen = FALSE;
382 /*************************************************
383 * Millisecond sleep function *
384 *************************************************/
386 /* The basic sleep() function has a granularity of 1 second, which is too rough
387 in some cases - for example, when using an increasing delay to slow down
390 Argument: number of millseconds
397 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
398 .it_value = {.tv_sec = msec/1000,
399 .tv_usec = (msec % 1000) * 1000}};
405 /*************************************************
406 * Compare microsecond times *
407 *************************************************/
414 Returns: -1, 0, or +1
418 exim_tvcmp(struct timeval *t1, struct timeval *t2)
420 if (t1->tv_sec > t2->tv_sec) return +1;
421 if (t1->tv_sec < t2->tv_sec) return -1;
422 if (t1->tv_usec > t2->tv_usec) return +1;
423 if (t1->tv_usec < t2->tv_usec) return -1;
430 /*************************************************
431 * Clock tick wait function *
432 *************************************************/
434 #ifdef _POSIX_MONOTONIC_CLOCK
435 # ifdef CLOCK_BOOTTIME
436 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
438 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
441 /* Amount EXIM_CLOCK is behind realtime, at startup. */
442 static struct timespec offset_ts;
445 exim_clock_init(void)
448 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
449 (void)gettimeofday(&tv, NULL);
450 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
451 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
452 if (offset_ts.tv_nsec >= 0) return;
454 offset_ts.tv_nsec += 1000*1000*1000;
460 exim_gettime(struct timeval * tv)
462 #ifdef _POSIX_MONOTONIC_CLOCK
463 struct timespec now_ts;
465 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
467 now_ts.tv_sec += offset_ts.tv_sec;
468 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
471 now_ts.tv_nsec -= 1000*1000*1000;
473 tv->tv_sec = now_ts.tv_sec;
474 tv->tv_usec = now_ts.tv_nsec / 1000;
478 (void)gettimeofday(tv, NULL);
482 /* Exim uses a time + a pid to generate a unique identifier in two places: its
483 message IDs, and in file names for maildir deliveries. Because some OS now
484 re-use pids within the same second, sub-second times are now being used.
485 However, for absolute certainty, we must ensure the clock has ticked before
486 allowing the relevant process to complete. At the time of implementation of
487 this code (February 2003), the speed of processors is such that the clock will
488 invariably have ticked already by the time a process has done its job. This
489 function prepares for the time when things are faster - and it also copes with
490 clocks that go backwards.
493 prev_tv A timeval which was used to create uniqueness; its usec field
494 has been rounded down to the value of the resolution.
495 We want to be sure the current time is greater than this.
496 On return, updated to current (rounded down).
497 resolution The resolution that was used to divide the microseconds
498 (1 for maildir, larger for message ids)
504 exim_wait_tick(struct timeval * prev_tv, int resolution)
506 struct timeval now_tv;
507 long int now_true_usec;
509 exim_gettime(&now_tv);
510 now_true_usec = now_tv.tv_usec;
511 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
513 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
515 struct itimerval itval;
516 itval.it_interval.tv_sec = 0;
517 itval.it_interval.tv_usec = 0;
518 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
519 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
521 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
522 negative value for the microseconds is possible only in the case when "now"
523 is more than a second less than "tgt". That means that itval.it_value.tv_sec
524 is greater than zero. The following correction is therefore safe. */
526 if (itval.it_value.tv_usec < 0)
528 itval.it_value.tv_usec += 1000000;
529 itval.it_value.tv_sec -= 1;
532 DEBUG(D_transport|D_receive)
534 if (!f.running_in_test_harness)
536 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
537 prev_tv->tv_sec, (long) prev_tv->tv_usec,
538 now_tv.tv_sec, (long) now_tv.tv_usec);
539 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
540 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
546 /* Be prapared to go around if the kernel does not implement subtick
547 granularity (GNU Hurd) */
549 exim_gettime(&now_tv);
550 now_true_usec = now_tv.tv_usec;
551 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
559 /*************************************************
560 * Call fopen() with umask 777 and adjust mode *
561 *************************************************/
563 /* Exim runs with umask(0) so that files created with open() have the mode that
564 is specified in the open() call. However, there are some files, typically in
565 the spool directory, that are created with fopen(). They end up world-writeable
566 if no precautions are taken. Although the spool directory is not accessible to
567 the world, this is an untidiness. So this is a wrapper function for fopen()
568 that sorts out the mode of the created file.
571 filename the file name
572 options the fopen() options
573 mode the required mode
575 Returns: the fopened FILE or NULL
579 modefopen(const uschar *filename, const char *options, mode_t mode)
581 mode_t saved_umask = umask(0777);
582 FILE *f = Ufopen(filename, options);
583 (void)umask(saved_umask);
584 if (f != NULL) (void)fchmod(fileno(f), mode);
589 /*************************************************
590 * Ensure stdin, stdout, and stderr exist *
591 *************************************************/
593 /* Some operating systems grumble if an exec() happens without a standard
594 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
595 file will be opened and will use these fd values, and then some other bit of
596 code will assume, for example, that it can write error messages to stderr.
597 This function ensures that fds 0, 1, and 2 are open if they do not already
598 exist, by connecting them to /dev/null.
600 This function is also used to ensure that std{in,out,err} exist at all times,
601 so that if any library that Exim calls tries to use them, it doesn't crash.
612 for (int i = 0; i <= 2; i++)
614 if (fstat(i, &statbuf) < 0 && errno == EBADF)
616 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
617 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
618 string_open_failed("/dev/null", NULL));
619 if (devnull != i) (void)dup2(devnull, i);
622 if (devnull > 2) (void)close(devnull);
628 /*************************************************
629 * Close unwanted file descriptors for delivery *
630 *************************************************/
632 /* This function is called from a new process that has been forked to deliver
633 an incoming message, either directly, or using exec.
635 We want any smtp input streams to be closed in this new process. However, it
636 has been observed that using fclose() here causes trouble. When reading in -bS
637 input, duplicate copies of messages have been seen. The files will be sharing a
638 file pointer with the parent process, and it seems that fclose() (at least on
639 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
640 least sometimes. Hence we go for closing the underlying file descriptors.
642 If TLS is active, we want to shut down the TLS library, but without molesting
643 the parent's SSL connection.
645 For delivery of a non-SMTP message, we want to close stdin and stdout (and
646 stderr unless debugging) because the calling process might have set them up as
647 pipes and be waiting for them to close before it waits for the submission
648 process to terminate. If they aren't closed, they hold up the calling process
649 until the initial delivery process finishes, which is not what we want.
651 Exception: We do want it for synchronous delivery!
653 And notwithstanding all the above, if D_resolver is set, implying resolver
654 debugging, leave stdout open, because that's where the resolver writes its
657 When we close stderr (which implies we've also closed stdout), we also get rid
658 of any controlling terminal.
670 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
672 (void)close(fileno(smtp_in));
673 (void)close(fileno(smtp_out));
678 (void)close(0); /* stdin */
679 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
680 if (debug_selector == 0) /* stderr */
682 if (!f.synchronous_delivery)
695 /*************************************************
697 *************************************************/
699 /* This function sets a new uid and gid permanently, optionally calling
700 initgroups() to set auxiliary groups. There are some special cases when running
701 Exim in unprivileged modes. In these situations the effective uid will not be
702 root; if we already have the right effective uid/gid, and don't need to
703 initialize any groups, leave things as they are.
708 igflag TRUE if initgroups() wanted
709 msg text to use in debugging output and failure log
711 Returns: nothing; bombs out on failure
715 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
717 uid_t euid = geteuid();
718 gid_t egid = getegid();
720 if (euid == root_uid || euid != uid || egid != gid || igflag)
722 /* At least one OS returns +1 for initgroups failure, so just check for
727 struct passwd *pw = getpwuid(uid);
729 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
730 "no passwd entry for uid=%ld", (long int)uid);
732 if (initgroups(pw->pw_name, gid) != 0)
733 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
734 (long int)uid, strerror(errno));
737 if (setgid(gid) < 0 || setuid(uid) < 0)
738 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
739 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
742 /* Debugging output included uid/gid and all groups */
746 int group_count, save_errno;
747 gid_t group_list[EXIM_GROUPLIST_SIZE];
748 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
749 (long int)geteuid(), (long int)getegid(), (long int)getpid());
750 group_count = getgroups(nelem(group_list), group_list);
752 debug_printf(" auxiliary group list:");
754 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
755 else if (group_count < 0)
756 debug_printf(" <error: %s>", strerror(save_errno));
757 else debug_printf(" <none>");
765 /*************************************************
767 *************************************************/
769 /* Exim exits via this function so that it always clears up any open
775 Returns: does not return
784 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
785 ">>>>>>>>>>>>>>>>\n",
786 (int)getpid(), process_purpose, rc);
792 exim_underbar_exit(int rc)
796 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
797 ">>>>>>>>>>>>>>>>\n",
798 (int)getpid(), process_purpose, rc);
804 /* Print error string, then die */
806 exim_fail(const char * fmt, ...)
810 vfprintf(stderr, fmt, ap);
814 /* fail if a length is too long */
816 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
818 if (itemlen <= maxlen)
820 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
821 itemlen, maxlen, description);
825 /* only pass through the string item back to the caller if it's short enough */
826 static inline const uschar *
827 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
829 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
833 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
834 of chown()/fchown(). See src/functions.h for more explanation */
836 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
838 int saved_errno = errno; /* from the preceeding chown call */
840 log_write(0, LOG_MAIN|LOG_PANIC,
841 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
842 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
843 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
845 /* I leave this here, commented, in case the "bug"(?) comes up again.
846 It is not an Exim bug, but we can provide a workaround.
852 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
854 if (buf.st_uid == owner && buf.st_gid == group) return 0;
855 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
857 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
865 /*************************************************
866 * Extract port from host address *
867 *************************************************/
869 /* Called to extract the port from the values given to -oMa and -oMi.
870 It also checks the syntax of the address, and terminates it before the
871 port data when a port is extracted.
874 address the address, with possible port on the end
876 Returns: the port, or zero if there isn't one
877 bombs out on a syntax error
881 check_port(uschar *address)
883 int port = host_address_extract_port(address);
884 if (string_is_ip_address(address, NULL) == 0)
885 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
891 /*************************************************
892 * Test/verify an address *
893 *************************************************/
895 /* This function is called by the -bv and -bt code. It extracts a working
896 address from a full RFC 822 address. This isn't really necessary per se, but it
897 has the effect of collapsing source routes.
901 flags flag bits for verify_address()
902 exit_value to be set for failures
908 test_address(uschar *s, int flags, int *exit_value)
910 int start, end, domain;
911 uschar *parse_error = NULL;
912 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
916 fprintf(stdout, "syntax error: %s\n", parse_error);
921 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
922 -1, -1, NULL, NULL, NULL);
923 if (rc == FAIL) *exit_value = 2;
924 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
930 /*************************************************
931 * Show supported features *
932 *************************************************/
935 show_db_version(FILE * f)
937 #ifdef DB_VERSION_STRING
940 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
941 fprintf(f, " Runtime: %s\n",
942 db_version(NULL, NULL, NULL));
945 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
947 #elif defined(BTREEVERSION) && defined(HASHVERSION)
949 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
951 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
954 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
955 fprintf(f, "Probably ndbm\n");
956 #elif defined(USE_TDB)
957 fprintf(f, "Using tdb\n");
960 fprintf(f, "Probably GDBM (native mode)\n");
962 fprintf(f, "Probably GDBM (compatibility mode)\n");
968 /* This function is called for -bV/--version and for -d to output the optional
969 features of the current Exim binary.
971 Arguments: a FILE for printing
976 show_whats_supported(FILE * fp)
978 rmark reset_point = store_mark();
980 DEBUG(D_any) {} else show_db_version(fp);
982 g = string_cat(NULL, US"Support for:");
983 #ifdef SUPPORT_CRYPTEQ
984 g = string_cat(g, US" crypteq");
987 g = string_cat(g, US" iconv()");
990 g = string_cat(g, US" IPv6");
992 #ifdef HAVE_SETCLASSRESOURCES
993 g = string_cat(g, US" use_setclassresources");
996 g = string_cat(g, US" PAM");
999 g = string_cat(g, US" Perl");
1001 #ifdef EXPAND_DLFUNC
1002 g = string_cat(g, US" Expand_dlfunc");
1004 #ifdef USE_TCP_WRAPPERS
1005 g = string_cat(g, US" TCPwrappers");
1008 g = string_cat(g, US" GnuTLS");
1011 g = string_cat(g, US" OpenSSL");
1013 #ifndef DISABLE_TLS_RESUME
1014 g = string_cat(g, US" TLS_resume");
1016 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1017 g = string_cat(g, US" translate_ip_address");
1019 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1020 g = string_cat(g, US" move_frozen_messages");
1022 #ifdef WITH_CONTENT_SCAN
1023 g = string_cat(g, US" Content_Scanning");
1026 g = string_cat(g, US" DANE");
1028 #ifndef DISABLE_DKIM
1029 g = string_cat(g, US" DKIM");
1031 #ifdef SUPPORT_DMARC
1032 g = string_cat(g, US" DMARC");
1034 #ifndef DISABLE_DNSSEC
1035 g = string_cat(g, US" DNSSEC");
1037 #ifndef DISABLE_EVENT
1038 g = string_cat(g, US" Event");
1041 g = string_cat(g, US" I18N");
1043 #ifndef DISABLE_OCSP
1044 g = string_cat(g, US" OCSP");
1046 #ifndef DISABLE_PIPE_CONNECT
1047 g = string_cat(g, US" PIPECONNECT");
1049 #ifndef DISABLE_PRDR
1050 g = string_cat(g, US" PRDR");
1052 #ifdef SUPPORT_PROXY
1053 g = string_cat(g, US" PROXY");
1055 #ifndef DISABLE_QUEUE_RAMP
1056 g = string_cat(g, US" Queue_Ramp");
1058 #ifdef SUPPORT_SOCKS
1059 g = string_cat(g, US" SOCKS");
1062 g = string_cat(g, US" SPF");
1064 #if defined(SUPPORT_SRS)
1065 g = string_cat(g, US" SRS");
1069 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1071 #ifdef EXPERIMENTAL_ARC
1072 g = string_cat(g, US" Experimental_ARC");
1074 #ifdef EXPERIMENTAL_BRIGHTMAIL
1075 g = string_cat(g, US" Experimental_Brightmail");
1077 #ifdef EXPERIMENTAL_DCC
1078 g = string_cat(g, US" Experimental_DCC");
1080 #ifdef EXPERIMENTAL_DSN_INFO
1081 g = string_cat(g, US" Experimental_DSN_info");
1083 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1084 g = string_cat(g, US" Experimental_ESMTP_Limits");
1086 #ifdef EXPERIMENTAL_QUEUEFILE
1087 g = string_cat(g, US" Experimental_QUEUEFILE");
1089 #if defined(EXPERIMENTAL_SRS_ALT)
1090 g = string_cat(g, US" Experimental_SRS");
1092 g = string_cat(g, US"\n");
1094 g = string_cat(g, US"Lookups (built-in):");
1095 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1096 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1098 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1099 g = string_cat(g, US" cdb");
1101 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1102 g = string_cat(g, US" dbm dbmjz dbmnz");
1104 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1105 g = string_cat(g, US" dnsdb");
1107 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1108 g = string_cat(g, US" dsearch");
1110 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1111 g = string_cat(g, US" ibase");
1113 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1114 g = string_cat(g, US" json");
1116 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1117 g = string_cat(g, US" ldap ldapdn ldapm");
1120 g = string_cat(g, US" lmdb");
1122 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1123 g = string_cat(g, US" mysql");
1125 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1126 g = string_cat(g, US" nis nis0");
1128 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1129 g = string_cat(g, US" nisplus");
1131 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1132 g = string_cat(g, US" oracle");
1134 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1135 g = string_cat(g, US" passwd");
1137 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1138 g = string_cat(g, US" pgsql");
1140 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1141 g = string_cat(g, US" redis");
1143 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1144 g = string_cat(g, US" sqlite");
1146 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1147 g = string_cat(g, US" testdb");
1149 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1150 g = string_cat(g, US" whoson");
1152 g = string_cat(g, US"\n");
1154 g = auth_show_supported(g);
1155 g = route_show_supported(g);
1156 g = transport_show_supported(g);
1158 #ifdef WITH_CONTENT_SCAN
1159 g = malware_show_supported(g);
1162 if (fixed_never_users[0] > 0)
1165 g = string_cat(g, US"Fixed never_users: ");
1166 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1167 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1168 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1171 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1172 fputs(CS string_from_gstring(g), fp);
1174 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1176 /* Everything else is details which are only worth reporting when debugging.
1177 Perhaps the tls_version_report should move into this too. */
1180 /* clang defines __GNUC__ (at least, for me) so test for it first */
1181 #if defined(__clang__)
1182 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1183 #elif defined(__GNUC__)
1184 fprintf(fp, "Compiler: GCC [%s]\n",
1188 "? unknown version ?"
1192 fprintf(fp, "Compiler: <unknown>\n");
1195 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1196 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1197 __GLIBC__, __GLIBC_MINOR__);
1198 if (__GLIBC_PREREQ(2, 1))
1199 fprintf(fp, " Runtime: %s\n",
1200 gnu_get_libc_version());
1203 show_db_version(fp);
1206 tls_version_report(fp);
1209 utf8_version_report(fp);
1211 #ifdef SUPPORT_DMARC
1212 dmarc_version_report(fp);
1215 spf_lib_version_report(fp);
1218 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1219 if (authi->version_report)
1220 (*authi->version_report)(fp);
1222 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1223 characters; unless it's an ancient version of PCRE in which case it
1225 #ifndef PCRE_PRERELEASE
1226 # define PCRE_PRERELEASE
1229 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1232 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1233 fprintf(fp, "Library version: PCRE2: Compile: %d.%d%s\n"
1235 PCRE2_MAJOR, PCRE2_MINOR,
1236 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1240 #undef EXPAND_AND_QUOTE
1243 for (int i = 0; i < lookup_list_count; i++)
1244 if (lookup_list[i]->version_report)
1245 lookup_list[i]->version_report(fp);
1247 #ifdef WHITELIST_D_MACROS
1248 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1250 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1252 #ifdef TRUSTED_CONFIG_LIST
1253 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1255 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1259 store_reset(reset_point);
1263 /*************************************************
1264 * Show auxiliary information about Exim *
1265 *************************************************/
1268 show_exim_information(enum commandline_info request, FILE *stream)
1273 fprintf(stream, "Oops, something went wrong.\n");
1277 "The -bI: flag takes a string indicating which information to provide.\n"
1278 "If the string is not recognised, you'll get this help (on stderr).\n"
1280 " exim -bI:help this information\n"
1281 " exim -bI:dscp list of known dscp value keywords\n"
1282 " exim -bI:sieve list of supported sieve extensions\n"
1286 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1287 fprintf(stream, "%s\n", *pp);
1290 dscp_list_to_stream(stream);
1296 /*************************************************
1297 * Quote a local part *
1298 *************************************************/
1300 /* This function is used when a sender address or a From: or Sender: header
1301 line is being created from the caller's login, or from an authenticated_id. It
1302 applies appropriate quoting rules for a local part.
1304 Argument: the local part
1305 Returns: the local part, quoted if necessary
1309 local_part_quote(uschar *lpart)
1311 BOOL needs_quote = FALSE;
1314 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1316 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1317 (*t != '.' || t == lpart || t[1] == 0);
1320 if (!needs_quote) return lpart;
1322 g = string_catn(NULL, US"\"", 1);
1326 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1329 g = string_cat(g, lpart);
1332 g = string_catn(g, lpart, nq - lpart);
1333 g = string_catn(g, US"\\", 1);
1334 g = string_catn(g, nq, 1);
1338 g = string_catn(g, US"\"", 1);
1339 return string_from_gstring(g);
1345 /*************************************************
1346 * Load readline() functions *
1347 *************************************************/
1349 /* This function is called from testing executions that read data from stdin,
1350 but only when running as the calling user. Currently, only -be does this. The
1351 function loads the readline() function library and passes back the functions.
1352 On some systems, it needs the curses library, so load that too, but try without
1353 it if loading fails. All this functionality has to be requested at build time.
1356 fn_readline_ptr pointer to where to put the readline pointer
1357 fn_addhist_ptr pointer to where to put the addhistory function
1359 Returns: the dlopen handle or NULL on failure
1363 set_readline(char * (**fn_readline_ptr)(const char *),
1364 void (**fn_addhist_ptr)(const char *))
1367 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1369 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1370 if (dlhandle_curses) dlclose(dlhandle_curses);
1374 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1375 * char * readline (const char *prompt);
1376 * void add_history (const char *string);
1378 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1379 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1382 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1390 /*************************************************
1391 * Get a line from stdin for testing things *
1392 *************************************************/
1394 /* This function is called when running tests that can take a number of lines
1395 of input (for example, -be and -bt). It handles continuations and trailing
1396 spaces. And prompting and a blank line output on eof. If readline() is in use,
1397 the arguments are non-NULL and provide the relevant functions.
1400 fn_readline readline function or NULL
1401 fn_addhist addhist function or NULL
1403 Returns: pointer to dynamic memory, or NULL at end of file
1407 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1411 if (!fn_readline) { printf("> "); fflush(stdout); }
1413 for (int i = 0;; i++)
1415 uschar buffer[1024];
1419 char *readline_line = NULL;
1422 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1423 if (*readline_line != 0 && fn_addhist) fn_addhist(readline_line);
1424 p = US readline_line;
1429 /* readline() not in use */
1432 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1436 /* Handle the line */
1438 ss = p + (int)Ustrlen(p);
1439 while (ss > p && isspace(ss[-1])) ss--;
1442 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1444 g = string_catn(g, p, ss - p);
1447 if (fn_readline) free(readline_line);
1450 /* g can only be NULL if ss==p */
1451 if (ss == p || g->s[g->ptr-1] != '\\')
1455 (void) string_from_gstring(g);
1458 if (!g) printf("\n");
1459 return string_from_gstring(g);
1464 /*************************************************
1465 * Output usage information for the program *
1466 *************************************************/
1468 /* This function is called when there are no recipients
1469 or a specific --help argument was added.
1472 progname information on what name we were called by
1474 Returns: DOES NOT RETURN
1478 exim_usage(uschar *progname)
1481 /* Handle specific program invocation variants */
1482 if (Ustrcmp(progname, US"-mailq") == 0)
1484 "mailq - list the contents of the mail queue\n\n"
1485 "For a list of options, see the Exim documentation.\n");
1487 /* Generic usage - we output this whatever happens */
1489 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1490 "not directly from a shell command line. Options and/or arguments control\n"
1491 "what it does when called. For a list of options, see the Exim documentation.\n");
1496 /*************************************************
1497 * Validate that the macros given are okay *
1498 *************************************************/
1500 /* Typically, Exim will drop privileges if macros are supplied. In some
1501 cases, we want to not do so.
1503 Arguments: opt_D_used - true if the commandline had a "-D" option
1504 Returns: true if trusted, false otherwise
1508 macros_trusted(BOOL opt_D_used)
1510 #ifdef WHITELIST_D_MACROS
1511 uschar *whitelisted, *end, *p, **whites;
1512 int white_count, i, n;
1514 BOOL prev_char_item, found;
1519 #ifndef WHITELIST_D_MACROS
1523 /* We only trust -D overrides for some invoking users:
1524 root, the exim run-time user, the optional config owner user.
1525 I don't know why config-owner would be needed, but since they can own the
1526 config files anyway, there's no security risk to letting them override -D. */
1527 if ( ! ((real_uid == root_uid)
1528 || (real_uid == exim_uid)
1529 #ifdef CONFIGURE_OWNER
1530 || (real_uid == config_uid)
1534 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1538 /* Get a list of macros which are whitelisted */
1539 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1540 prev_char_item = FALSE;
1542 for (p = whitelisted; *p != '\0'; ++p)
1544 if (*p == ':' || isspace(*p))
1549 prev_char_item = FALSE;
1552 if (!prev_char_item)
1553 prev_char_item = TRUE;
1560 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1561 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1566 if (i == white_count)
1568 while (*p != '\0' && p < end)
1574 /* The list of commandline macros should be very short.
1575 Accept the N*M complexity. */
1576 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1579 for (uschar ** w = whites; *w; ++w)
1580 if (Ustrcmp(*w, m->name) == 0)
1587 if (!m->replacement)
1589 if ((len = m->replen) == 0)
1591 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1594 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1600 /*************************************************
1601 * Expansion testing *
1602 *************************************************/
1604 /* Expand and print one item, doing macro-processing.
1607 item line for expansion
1611 expansion_test_line(const uschar * line)
1617 Ustrncpy(big_buffer, line, big_buffer_size);
1618 big_buffer[big_buffer_size-1] = '\0';
1619 len = Ustrlen(big_buffer);
1621 (void) macros_expand(0, &len, &dummy_macexp);
1623 if (isupper(big_buffer[0]))
1625 if (macro_read_assignment(big_buffer))
1626 printf("Defined macro '%s'\n", mlast->name);
1629 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1630 else printf("Failed: %s\n", expand_string_message);
1635 /*************************************************
1636 * Entry point and high-level code *
1637 *************************************************/
1639 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1640 the appropriate action. All the necessary functions are present in the one
1641 binary. I originally thought one should split it up, but it turns out that so
1642 much of the apparatus is needed in each chunk that one might as well just have
1643 it all available all the time, which then makes the coding easier as well.
1646 argc count of entries in argv
1647 argv argument strings, with argv[0] being the program name
1649 Returns: EXIT_SUCCESS if terminated successfully
1650 EXIT_FAILURE otherwise, except when a message has been sent
1651 to the sender, and -oee was given
1655 main(int argc, char **cargv)
1657 uschar **argv = USS cargv;
1658 int arg_receive_timeout = -1;
1659 int arg_smtp_receive_timeout = -1;
1660 int arg_error_handling = error_handling;
1661 int filter_sfd = -1;
1662 int filter_ufd = -1;
1665 int list_queue_option = 0;
1667 int msg_action_arg = -1;
1668 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1669 int queue_only_reason = 0;
1671 int perl_start_option = 0;
1673 int recipients_arg = argc;
1674 int sender_address_domain = 0;
1675 int test_retry_arg = -1;
1676 int test_rewrite_arg = -1;
1677 gid_t original_egid;
1678 BOOL arg_queue_only = FALSE;
1679 BOOL bi_option = FALSE;
1680 BOOL checking = FALSE;
1681 BOOL count_queue = FALSE;
1682 BOOL expansion_test = FALSE;
1683 BOOL extract_recipients = FALSE;
1684 BOOL flag_G = FALSE;
1685 BOOL flag_n = FALSE;
1686 BOOL forced_delivery = FALSE;
1687 BOOL f_end_dot = FALSE;
1688 BOOL deliver_give_up = FALSE;
1689 BOOL list_queue = FALSE;
1690 BOOL list_options = FALSE;
1691 BOOL list_config = FALSE;
1692 BOOL local_queue_only;
1693 BOOL one_msg_action = FALSE;
1694 BOOL opt_D_used = FALSE;
1695 BOOL queue_only_set = FALSE;
1696 BOOL receiving_message = TRUE;
1697 BOOL sender_ident_set = FALSE;
1698 BOOL session_local_queue_only;
1700 BOOL removed_privilege = FALSE;
1701 BOOL usage_wanted = FALSE;
1702 BOOL verify_address_mode = FALSE;
1703 BOOL verify_as_sender = FALSE;
1704 BOOL rcpt_verify_quota = FALSE;
1705 BOOL version_printed = FALSE;
1706 uschar *alias_arg = NULL;
1707 uschar *called_as = US"";
1708 uschar *cmdline_syslog_name = NULL;
1709 uschar *start_queue_run_id = NULL;
1710 uschar *stop_queue_run_id = NULL;
1711 uschar *expansion_test_message = NULL;
1712 const uschar *ftest_domain = NULL;
1713 const uschar *ftest_localpart = NULL;
1714 const uschar *ftest_prefix = NULL;
1715 const uschar *ftest_suffix = NULL;
1716 uschar *log_oneline = NULL;
1717 uschar *malware_test_file = NULL;
1718 uschar *real_sender_address;
1719 uschar *originator_home = US"/";
1723 struct stat statbuf;
1724 pid_t passed_qr_pid = (pid_t)0;
1725 int passed_qr_pipe = -1;
1726 gid_t group_list[EXIM_GROUPLIST_SIZE];
1728 /* For the -bI: flag */
1729 enum commandline_info info_flag = CMDINFO_NONE;
1730 BOOL info_stdout = FALSE;
1732 /* Possible options for -R and -S */
1734 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1736 /* Need to define this in case we need to change the environment in order
1737 to get rid of a bogus time zone. We have to make it char rather than uschar
1738 because some OS define it in /usr/include/unistd.h. */
1740 extern char **environ;
1742 #ifdef MEASURE_TIMING
1743 (void)gettimeofday(×tamp_startup, NULL);
1746 store_init(); /* Initialise the memory allocation susbsystem */
1747 pcre_init(); /* Set up memory handling for pcre */
1749 /* If the Exim user and/or group and/or the configuration file owner/group were
1750 defined by ref:name at build time, we must now find the actual uid/gid values.
1751 This is a feature to make the lives of binary distributors easier. */
1753 #ifdef EXIM_USERNAME
1754 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1757 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1759 /* If ref:name uses a number as the name, route_finduser() returns
1760 TRUE with exim_uid set and pw coerced to NULL. */
1762 exim_gid = pw->pw_gid;
1763 #ifndef EXIM_GROUPNAME
1766 "exim: ref:name should specify a usercode, not a group.\n"
1767 "exim: can't let you get away with it unless you also specify a group.\n");
1771 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1774 #ifdef EXIM_GROUPNAME
1775 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1776 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1779 #ifdef CONFIGURE_OWNERNAME
1780 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1781 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1782 CONFIGURE_OWNERNAME);
1785 /* We default the system_filter_user to be the Exim run-time user, as a
1786 sane non-root value. */
1787 system_filter_uid = exim_uid;
1789 #ifdef CONFIGURE_GROUPNAME
1790 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1791 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1792 CONFIGURE_GROUPNAME);
1795 /* In the Cygwin environment, some initialization used to need doing.
1796 It was fudged in by means of this macro; now no longer but we'll leave
1797 it in case of others. */
1803 /* Check a field which is patched when we are running Exim within its
1804 testing harness; do a fast initial check, and then the whole thing. */
1806 f.running_in_test_harness =
1807 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1808 if (f.running_in_test_harness)
1811 /* Protect against abusive argv[0] */
1812 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1814 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1815 at the start of a program; however, it seems that some environments do not
1816 follow this. A "strange" locale can affect the formatting of timestamps, so we
1819 setlocale(LC_ALL, "C");
1821 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1823 #ifdef _POSIX_MONOTONIC_CLOCK
1827 /* Set up the default handler for timing using alarm(). */
1829 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1831 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1832 because store_malloc writes a log entry on failure. */
1834 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1835 exim_fail("exim: failed to get store for log buffer\n");
1837 /* Initialize the default log options. */
1839 bits_set(log_selector, log_selector_size, log_default);
1841 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1842 NULL when the daemon is run and the file is closed. We have to use this
1843 indirection, because some systems don't allow writing to the variable "stderr".
1846 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1848 /* Ensure there is a big buffer for temporary use in several places. It is put
1849 in malloc store so that it can be freed for enlargement if necessary. */
1851 big_buffer = store_malloc(big_buffer_size);
1853 /* Set up the handler for the data request signal, and set the initial
1854 descriptive text. */
1856 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1857 set_process_info("initializing");
1858 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1859 signal(SIGSEGV, segv_handler); /* log faults */
1861 /* If running in a dockerized environment, the TERM signal is only
1862 delegated to the PID 1 if we request it by setting an signal handler */
1863 if (getpid() == 1) signal(SIGTERM, term_handler);
1865 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1866 in the daemon code. For the rest of Exim's uses, we ignore it. */
1868 signal(SIGHUP, SIG_IGN);
1870 /* We don't want to die on pipe errors as the code is written to handle
1871 the write error instead. */
1873 signal(SIGPIPE, SIG_IGN);
1875 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1876 set to SIG_IGN. This causes subprocesses that complete before the parent
1877 process waits for them not to hang around, so when Exim calls wait(), nothing
1878 is there. The wait() code has been made robust against this, but let's ensure
1879 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1880 ending status. We use sigaction rather than plain signal() on those OS where
1881 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1882 problem on AIX with this.) */
1886 struct sigaction act;
1887 act.sa_handler = SIG_DFL;
1888 sigemptyset(&(act.sa_mask));
1890 sigaction(SIGCHLD, &act, NULL);
1893 signal(SIGCHLD, SIG_DFL);
1896 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1901 /* Set up the version number. Set up the leading 'E' for the external form of
1902 message ids, set the pointer to the internal form, and initialize it to
1903 indicate no message being processed. */
1906 message_id_option[0] = '-';
1907 message_id_external = message_id_option + 1;
1908 message_id_external[0] = 'E';
1909 message_id = message_id_external + 1;
1912 /* Set the umask to zero so that any files Exim creates using open() are
1913 created with the modes that it specifies. NOTE: Files created with fopen() have
1914 a problem, which was not recognized till rather late (February 2006). With this
1915 umask, such files will be world writeable. (They are all content scanning files
1916 in the spool directory, which isn't world-accessible, so this is not a
1917 disaster, but it's untidy.) I don't want to change this overall setting,
1918 however, because it will interact badly with the open() calls. Instead, there's
1919 now a function called modefopen() that fiddles with the umask while calling
1924 /* Precompile the regular expression for matching a message id. Keep this in
1925 step with the code that generates ids in the accept.c module. We need to do
1926 this here, because the -M options check their arguments for syntactic validity
1927 using mac_ismsgid, which uses this. */
1930 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1932 /* Precompile the regular expression that is used for matching an SMTP error
1933 code, possibly extended, at the start of an error message. Note that the
1934 terminating whitespace character is included. */
1937 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1940 #ifdef WHITELIST_D_MACROS
1941 /* Precompile the regular expression used to filter the content of macros
1942 given to -D for permissibility. */
1944 regex_whitelisted_macro =
1945 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1948 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1950 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1951 this seems to be a generally accepted convention, since one finds symbolic
1952 links called "mailq" in standard OS configurations. */
1954 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1955 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1958 receiving_message = FALSE;
1959 called_as = US"-mailq";
1962 /* If the program is called as "rmail" treat it as equivalent to
1963 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1964 i.e. preventing a single dot on a line from terminating the message, and
1965 returning with zero return code, even in cases of error (provided an error
1966 message has been sent). */
1968 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1969 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1972 called_as = US"-rmail";
1973 errors_sender_rc = EXIT_SUCCESS;
1976 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1977 this is a smail convention. */
1979 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1980 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1982 smtp_input = smtp_batched_input = TRUE;
1983 called_as = US"-rsmtp";
1986 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1987 this is a smail convention. */
1989 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1990 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1993 receiving_message = FALSE;
1994 called_as = US"-runq";
1997 /* If the program is called as "newaliases" treat it as equivalent to
1998 "exim -bi"; this is a sendmail convention. */
2000 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2001 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2004 receiving_message = FALSE;
2005 called_as = US"-newaliases";
2008 /* Save the original effective uid for a couple of uses later. It should
2009 normally be root, but in some esoteric environments it may not be. */
2011 original_euid = geteuid();
2012 original_egid = getegid();
2014 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2015 to be the same as the real ones. This makes a difference only if Exim is setuid
2016 (or setgid) to something other than root, which could be the case in some
2017 special configurations. */
2019 real_uid = getuid();
2020 real_gid = getgid();
2022 if (real_uid == root_uid)
2024 if ((rv = setgid(real_gid)))
2025 exim_fail("exim: setgid(%ld) failed: %s\n",
2026 (long int)real_gid, strerror(errno));
2027 if ((rv = setuid(real_uid)))
2028 exim_fail("exim: setuid(%ld) failed: %s\n",
2029 (long int)real_uid, strerror(errno));
2032 /* If neither the original real uid nor the original euid was root, Exim is
2033 running in an unprivileged state. */
2035 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2037 /* For most of the args-parsing we need to use permanent pool memory */
2039 int old_pool = store_pool;
2040 store_pool = POOL_PERM;
2042 /* Scan the program's arguments. Some can be dealt with right away; others are
2043 simply recorded for checking and handling afterwards. Do a high-level switch
2044 on the second character (the one after '-'), to save some effort. */
2046 for (i = 1; i < argc; i++)
2048 BOOL badarg = FALSE;
2049 uschar * arg = argv[i];
2053 /* An argument not starting with '-' is the start of a recipients list;
2054 break out of the options-scanning loop. */
2062 /* An option consisting of -- terminates the options */
2064 if (Ustrcmp(arg, "--") == 0)
2066 recipients_arg = i + 1;
2070 /* Handle flagged options */
2072 switchchar = arg[1];
2075 /* Make all -ex options synonymous with -oex arguments, since that
2076 is assumed by various callers. Also make -qR options synonymous with -R
2077 options, as that seems to be required as well. Allow for -qqR too, and
2078 the same for -S options. */
2080 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2081 Ustrncmp(arg+1, "qR", 2) == 0 ||
2082 Ustrncmp(arg+1, "qS", 2) == 0)
2084 switchchar = arg[2];
2087 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2089 switchchar = arg[3];
2091 f.queue_2stage = TRUE;
2094 /* Make -r synonymous with -f, since it is a documented alias */
2096 else if (arg[1] == 'r') switchchar = 'f';
2098 /* Make -ov synonymous with -v */
2100 else if (Ustrcmp(arg, "-ov") == 0)
2106 /* deal with --option_aliases */
2107 else if (switchchar == '-')
2109 if (Ustrcmp(argrest, "help") == 0)
2111 usage_wanted = TRUE;
2114 else if (Ustrcmp(argrest, "version") == 0)
2121 /* High-level switch on active initial letter */
2126 /* sendmail uses -Ac and -Am to control which .cf file is used;
2129 if (!*argrest) { badarg = TRUE; break; }
2132 BOOL ignore = FALSE;
2137 if (*(argrest + 1) == '\0')
2141 if (!ignore) badarg = TRUE;
2145 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2146 so has no need of it. */
2149 if (!*argrest) i++; /* Skip over the type */
2155 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2159 /* -bd: Run in daemon mode, awaiting SMTP connections.
2160 -bdf: Ditto, but in the foreground.
2163 f.daemon_listen = TRUE;
2164 if (*argrest == 'f') f.background_daemon = FALSE;
2165 else if (*argrest) badarg = TRUE;
2168 /* -be: Run in expansion test mode
2169 -bem: Ditto, but read a message from a file first
2172 expansion_test = checking = TRUE;
2173 if (*argrest == 'm')
2175 if (++i >= argc) { badarg = TRUE; break; }
2176 expansion_test_message = argv[i];
2179 if (*argrest) badarg = TRUE;
2182 /* -bF: Run system filter test */
2184 filter_test |= checking = FTEST_SYSTEM;
2185 if (*argrest) badarg = TRUE;
2186 else if (++i < argc) filter_test_sfile = argv[i];
2187 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2190 /* -bf: Run user filter test
2191 -bfd: Set domain for filter testing
2192 -bfl: Set local part for filter testing
2193 -bfp: Set prefix for filter testing
2194 -bfs: Set suffix for filter testing
2199 filter_test |= checking = FTEST_USER;
2200 if (++i < argc) filter_test_ufile = argv[i];
2201 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2206 exim_fail("exim: string expected after %s\n", arg);
2207 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2208 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2209 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2210 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2215 /* -bh: Host checking - an IP address must follow. */
2217 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2219 if (++i >= argc) { badarg = TRUE; break; }
2220 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), TRUE);
2221 host_checking = checking = f.log_testing_mode = TRUE;
2222 f.host_checking_callout = *argrest == 'c';
2223 message_logs = FALSE;
2228 /* -bi: This option is used by sendmail to initialize *the* alias file,
2229 though it has the -oA option to specify a different file. Exim has no
2230 concept of *the* alias file, but since Sun's YP make script calls
2231 sendmail this way, some support must be provided. */
2233 if (!*argrest) bi_option = TRUE;
2237 /* -bI: provide information, of the type to follow after a colon.
2238 This is an Exim flag. */
2240 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2242 uschar *p = argrest+1;
2243 info_flag = CMDINFO_HELP;
2245 if (strcmpic(p, CUS"sieve") == 0)
2247 info_flag = CMDINFO_SIEVE;
2250 else if (strcmpic(p, CUS"dscp") == 0)
2252 info_flag = CMDINFO_DSCP;
2255 else if (strcmpic(p, CUS"help") == 0)
2261 /* -bm: Accept and deliver message - the default option. Reinstate
2262 receiving_message, which got turned off for all -b options.
2263 -bmalware: test the filename given for malware */
2265 if (!*argrest) receiving_message = TRUE;
2266 else if (Ustrcmp(argrest, "alware") == 0)
2268 if (++i >= argc) { badarg = TRUE; break; }
2270 malware_test_file = argv[i];
2275 /* -bnq: For locally originating messages, do not qualify unqualified
2276 addresses. In the envelope, this causes errors; in header lines they
2279 if (Ustrcmp(argrest, "q") == 0)
2281 f.allow_unqualified_sender = FALSE;
2282 f.allow_unqualified_recipient = FALSE;
2287 /* -bpxx: List the contents of the mail queue, in various forms. If
2288 the option is -bpc, just a queue count is needed. Otherwise, if the
2289 first letter after p is r, then order is random. */
2291 if (*argrest == 'c')
2294 if (*++argrest) badarg = TRUE;
2298 if (*argrest == 'r')
2300 list_queue_option = 8;
2303 else list_queue_option = 0;
2307 /* -bp: List the contents of the mail queue, top-level only */
2311 /* -bpu: List the contents of the mail queue, top-level undelivered */
2313 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2315 /* -bpa: List the contents of the mail queue, including all delivered */
2317 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2319 /* Unknown after -bp[r] */
2325 /* -bP: List the configuration variables given as the address list.
2326 Force -v, so configuration errors get displayed. */
2329 /* -bP config: we need to setup here, because later,
2330 when list_options is checked, the config is read already */
2333 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2336 readconf_save_config(version_string);
2340 list_options = TRUE;
2341 debug_selector |= D_v;
2342 debug_file = stderr;
2346 /* -brt: Test retry configuration lookup */
2348 if (Ustrcmp(argrest, "t") == 0)
2351 test_retry_arg = i + 1;
2355 /* -brw: Test rewrite configuration */
2357 else if (Ustrcmp(argrest, "w") == 0)
2360 test_rewrite_arg = i + 1;
2366 /* -bS: Read SMTP commands on standard input, but produce no replies -
2367 all errors are reported by sending messages. */
2370 smtp_input = smtp_batched_input = receiving_message = TRUE;
2374 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2375 on standard output. */
2377 if (!*argrest) smtp_input = receiving_message = TRUE;
2381 /* -bt: address testing mode */
2384 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2388 /* -bv: verify addresses */
2391 verify_address_mode = checking = f.log_testing_mode = TRUE;
2393 /* -bvs: verify sender addresses */
2395 else if (Ustrcmp(argrest, "s") == 0)
2397 verify_address_mode = checking = f.log_testing_mode = TRUE;
2398 verify_as_sender = TRUE;
2403 /* -bV: Print version string and support details */
2407 printf("Exim version %s #%s built %s\n", version_string,
2408 version_cnumber, version_date);
2409 printf("%s\n", CS version_copyright);
2410 version_printed = TRUE;
2411 show_whats_supported(stdout);
2412 f.log_testing_mode = TRUE;
2417 /* -bw: inetd wait mode, accept a listening socket as stdin */
2419 f.inetd_wait_mode = TRUE;
2420 f.background_daemon = FALSE;
2421 f.daemon_listen = TRUE;
2423 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2424 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2435 /* -C: change configuration file list; ignore if it isn't really
2436 a change! Enforce a prefix check if required. */
2440 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2441 if (Ustrcmp(config_main_filelist, argrest) != 0)
2443 #ifdef ALT_CONFIG_PREFIX
2445 int len = Ustrlen(ALT_CONFIG_PREFIX);
2446 const uschar *list = argrest;
2448 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2449 while((filename = string_nextinlist(&list, &sep, big_buffer,
2451 if ( ( Ustrlen(filename) < len
2452 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2453 || Ustrstr(filename, "/../") != NULL
2455 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2457 exim_fail("-C Permission denied\n");
2459 if (real_uid != root_uid)
2461 #ifdef TRUSTED_CONFIG_LIST
2463 if (real_uid != exim_uid
2464 #ifdef CONFIGURE_OWNER
2465 && real_uid != config_uid
2468 f.trusted_config = FALSE;
2471 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2474 struct stat statbuf;
2476 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2477 (statbuf.st_uid != root_uid /* owner not root */
2478 #ifdef CONFIGURE_OWNER
2479 && statbuf.st_uid != config_uid /* owner not the special one */
2482 (statbuf.st_gid != root_gid /* group not root */
2483 #ifdef CONFIGURE_GROUP
2484 && statbuf.st_gid != config_gid /* group not the special one */
2486 && (statbuf.st_mode & 020) != 0 /* group writeable */
2488 (statbuf.st_mode & 2) != 0) /* world writeable */
2490 f.trusted_config = FALSE;
2495 /* Well, the trust list at least is up to scratch... */
2497 uschar *trusted_configs[32];
2500 int old_pool = store_pool;
2501 store_pool = POOL_MAIN;
2503 reset_point = store_mark();
2504 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2506 uschar *start = big_buffer, *nl;
2507 while (*start && isspace(*start))
2511 nl = Ustrchr(start, '\n');
2514 trusted_configs[nr_configs++] = string_copy(start);
2515 if (nr_configs == nelem(trusted_configs))
2523 const uschar *list = argrest;
2525 while (f.trusted_config && (filename = string_nextinlist(&list,
2526 &sep, big_buffer, big_buffer_size)))
2528 for (i=0; i < nr_configs; i++)
2529 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2531 if (i == nr_configs)
2533 f.trusted_config = FALSE;
2538 else /* No valid prefixes found in trust_list file. */
2539 f.trusted_config = FALSE;
2540 store_reset(reset_point);
2541 store_pool = old_pool;
2544 else /* Could not open trust_list file. */
2545 f.trusted_config = FALSE;
2548 /* Not root; don't trust config */
2549 f.trusted_config = FALSE;
2553 config_main_filelist = argrest;
2554 f.config_changed = TRUE;
2559 /* -D: set up a macro definition */
2562 #ifdef DISABLE_D_OPTION
2563 exim_fail("exim: -D is not available in this Exim binary\n");
2569 uschar *s = argrest;
2572 while (isspace(*s)) s++;
2574 if (*s < 'A' || *s > 'Z')
2575 exim_fail("exim: macro name set by -D must start with "
2576 "an upper case letter\n");
2578 while (isalnum(*s) || *s == '_')
2580 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2584 if (ptr == 0) { badarg = TRUE; break; }
2585 while (isspace(*s)) s++;
2588 if (*s++ != '=') { badarg = TRUE; break; }
2589 while (isspace(*s)) s++;
2592 for (m = macros_user; m; m = m->next)
2593 if (Ustrcmp(m->name, name) == 0)
2594 exim_fail("exim: duplicated -D in command line\n");
2596 m = macro_create(name, s, TRUE);
2598 if (clmacro_count >= MAX_CLMACROS)
2599 exim_fail("exim: too many -D options on command line\n");
2600 clmacros[clmacro_count++] =
2601 string_sprintf("-D%s=%s", m->name, m->replacement);
2606 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2607 The latter is now a no-op, retained for compatibility only. If -dd is used,
2608 debugging subprocesses of the daemon is disabled. */
2611 if (Ustrcmp(argrest, "ropcr") == 0)
2613 /* drop_cr = TRUE; */
2616 /* Use an intermediate variable so that we don't set debugging while
2617 decoding the debugging bits. */
2621 unsigned int selector = D_default;
2624 if (*argrest == 'd')
2626 f.debug_daemon = TRUE;
2630 decode_bits(&selector, 1, debug_notall, argrest,
2631 debug_options, debug_options_count, US"debug", 0);
2632 debug_selector = selector;
2637 /* -E: This is a local error message. This option is not intended for
2638 external use at all, but is not restricted to trusted callers because it
2639 does no harm (just suppresses certain error messages) and if Exim is run
2640 not setuid root it won't always be trusted when it generates error
2641 messages using this option. If there is a message id following -E, point
2642 message_reference at it, for logging. */
2645 f.local_error_message = TRUE;
2646 if (mac_ismsgid(argrest)) message_reference = argrest;
2650 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2651 option, so it looks as if historically the -oex options are also callable
2652 without the leading -o. So we have to accept them. Before the switch,
2653 anything starting -oe has been converted to -e. Exim does not support all
2654 of the sendmail error options. */
2657 if (Ustrcmp(argrest, "e") == 0)
2659 arg_error_handling = ERRORS_SENDER;
2660 errors_sender_rc = EXIT_SUCCESS;
2662 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2663 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2664 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2665 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2670 /* -F: Set sender's full name, used instead of the gecos entry from
2671 the password file. Since users can usually alter their gecos entries,
2672 there's no security involved in using this instead. The data can follow
2673 the -F or be in the next argument. */
2677 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2678 originator_name = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), TRUE);
2679 f.sender_name_forced = TRUE;
2683 /* -f: Set sender's address - this value is only actually used if Exim is
2684 run by a trusted user, or if untrusted_set_sender is set and matches the
2685 address, except that the null address can always be set by any user. The
2686 test for this happens later, when the value given here is ignored when not
2687 permitted. For an untrusted user, the actual sender is still put in Sender:
2688 if it doesn't match the From: header (unless no_local_from_check is set).
2689 The data can follow the -f or be in the next argument. The -r switch is an
2690 obsolete form of -f but since there appear to be programs out there that
2691 use anything that sendmail has ever supported, better accept it - the
2692 synonymizing is done before the switch above.
2694 At this stage, we must allow domain literal addresses, because we don't
2695 know what the setting of allow_domain_literals is yet. Ditto for trailing
2696 dots and strip_trailing_dot. */
2700 int dummy_start, dummy_end;
2703 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2704 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2706 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2709 uschar * temp = argrest + Ustrlen(argrest) - 1;
2710 while (temp >= argrest && isspace(*temp)) temp--;
2711 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2712 allow_domain_literals = TRUE;
2713 strip_trailing_dot = TRUE;
2715 allow_utf8_domains = TRUE;
2717 if (!(sender_address = parse_extract_address(argrest, &errmess,
2718 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2719 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2721 sender_address = string_copy_taint(sender_address, TRUE);
2723 message_smtputf8 = string_is_utf8(sender_address);
2724 allow_utf8_domains = FALSE;
2726 allow_domain_literals = FALSE;
2727 strip_trailing_dot = FALSE;
2729 f.sender_address_forced = TRUE;
2733 /* -G: sendmail invocation to specify that it's a gateway submission and
2734 sendmail may complain about problems instead of fixing them.
2735 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2736 not at this time complain about problems. */
2742 /* -h: Set the hop count for an incoming message. Exim does not currently
2743 support this; it always computes it by counting the Received: headers.
2744 To put it in will require a change to the spool header file format. */
2748 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2749 if (!isdigit(*argrest)) badarg = TRUE;
2753 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2754 not to be documented for sendmail but mailx (at least) uses it) */
2757 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2761 /* -L: set the identifier used for syslog; equivalent to setting
2762 syslog_processname in the config file, but needs to be an admin option. */
2766 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2767 if ((sz = Ustrlen(argrest)) > 32)
2768 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2770 exim_fail("exim: the -L syslog name is too short\n");
2771 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2775 receiving_message = FALSE;
2777 /* -MC: continue delivery of another message via an existing open
2778 file descriptor. This option is used for an internal call by the
2779 smtp transport when there is a pending message waiting to go to an
2780 address to which it has got a connection. Five subsequent arguments are
2781 required: transport name, host name, IP address, sequence number, and
2782 message_id. Transports may decline to create new processes if the sequence
2783 number gets too big. The channel is stdin. This (-MC) must be the last
2784 argument. There's a subsequent check that the real-uid is privileged.
2786 If we are running in the test harness. delay for a bit, to let the process
2787 that set this one up complete. This makes for repeatability of the logging,
2790 if (Ustrcmp(argrest, "C") == 0)
2792 union sockaddr_46 interface_sock;
2793 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2796 exim_fail("exim: too many or too few arguments after -MC\n");
2798 if (msg_action_arg >= 0)
2799 exim_fail("exim: incompatible arguments\n");
2801 continue_transport = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), TRUE);
2802 continue_hostname = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), TRUE);
2803 continue_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), TRUE);
2804 continue_sequence = Uatoi(argv[++i]);
2805 msg_action = MSG_DELIVER;
2806 msg_action_arg = ++i;
2807 forced_delivery = TRUE;
2808 queue_run_pid = passed_qr_pid;
2809 queue_run_pipe = passed_qr_pipe;
2811 if (!mac_ismsgid(argv[i]))
2812 exim_fail("exim: malformed message id %s after -MC option\n",
2815 /* Set up $sending_ip_address and $sending_port, unless proxied */
2817 if (!continue_proxy_cipher)
2818 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2820 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2823 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2826 testharness_pause_ms(500);
2830 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2834 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2835 precedes -MC (see above). The flag indicates that the host to which
2836 Exim is connected has accepted an AUTH sequence. */
2838 case 'A': f.smtp_authenticated = TRUE; break;
2840 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2841 that exim is connected to supports the esmtp extension DSN */
2843 case 'D': smtp_peer_options |= OPTION_DSN; break;
2845 /* -MCd: for debug, set a process-purpose string */
2847 case 'd': if (++i < argc)
2848 process_purpose = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), TRUE);
2852 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2853 from the commandline should be tainted - but we will need an untainted
2854 value for the spoolfile when doing a -odi delivery process. */
2856 case 'G': if (++i < argc) queue_name = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), FALSE);
2860 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2862 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2864 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2865 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2866 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2868 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2870 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2875 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2876 it preceded -MC (see above) */
2878 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2880 #ifdef SUPPORT_SOCKS
2881 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2882 case 'p': proxy_session = TRUE;
2885 proxy_local_address = string_copy_taint(argv[i], TRUE);
2888 proxy_local_port = Uatoi(argv[i]);
2891 proxy_external_address = string_copy_taint(argv[i], TRUE);
2894 proxy_external_port = Uatoi(argv[i]);
2900 /* -MCQ: pass on the pid of the queue-running process that started
2901 this chain of deliveries and the fd of its synchronizing pipe; this
2902 is useful only when it precedes -MC (see above) */
2904 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2906 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2910 /* -MCq: do a quota check on the given recipient for the given size
2911 of message. Separate from -MC. */
2912 case 'q': rcpt_verify_quota = TRUE;
2913 if (++i < argc) message_size = Uatoi(argv[i]);
2917 /* -MCS: set the smtp_use_size flag; this is useful only when it
2918 precedes -MC (see above) */
2920 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2923 /* -MCs: used with -MCt; SNI was sent */
2924 /* -MCr: ditto, DANE */
2927 case 's': if (++i < argc)
2929 continue_proxy_sni = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), TRUE);
2930 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
2935 /* -MCt: similar to -MCT below but the connection is still open
2936 via a proxy process which handles the TLS context and coding.
2937 Require three arguments for the proxied local address and port,
2938 and the TLS cipher. */
2940 case 't': if (++i < argc)
2941 sending_ip_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), TRUE);
2944 sending_port = (int)(Uatol(argv[i]));
2947 continue_proxy_cipher = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), TRUE);
2951 /* -MCT: set the tls_offered flag; this is useful only when it
2952 precedes -MC (see above). The flag indicates that the host to which
2953 Exim is connected has offered TLS support. */
2955 case 'T': smtp_peer_options |= OPTION_TLS; break;
2958 default: badarg = TRUE; break;
2963 /* -M[x]: various operations on the following list of message ids:
2964 -M deliver the messages, ignoring next retry times and thawing
2965 -Mc deliver the messages, checking next retry times, no thawing
2966 -Mf freeze the messages
2967 -Mg give up on the messages
2968 -Mt thaw the messages
2969 -Mrm remove the messages
2970 In the above cases, this must be the last option. There are also the
2971 following options which are followed by a single message id, and which
2972 act on that message. Some of them use the "recipient" addresses as well.
2973 -Mar add recipient(s)
2974 -MG move to a different queue
2975 -Mmad mark all recipients delivered
2976 -Mmd mark recipients(s) delivered
2978 -Mset load a message for use with -be
2980 -Mvc show copy (of whole message, in RFC 2822 format)
2987 msg_action = MSG_DELIVER;
2988 forced_delivery = f.deliver_force_thaw = TRUE;
2990 else if (Ustrcmp(argrest, "ar") == 0)
2992 msg_action = MSG_ADD_RECIPIENT;
2993 one_msg_action = TRUE;
2995 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2996 else if (Ustrcmp(argrest, "es") == 0)
2998 msg_action = MSG_EDIT_SENDER;
2999 one_msg_action = TRUE;
3001 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3002 else if (Ustrcmp(argrest, "g") == 0)
3004 msg_action = MSG_DELIVER;
3005 deliver_give_up = TRUE;
3007 else if (Ustrcmp(argrest, "G") == 0)
3009 msg_action = MSG_SETQUEUE;
3010 queue_name_dest = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), TRUE);
3012 else if (Ustrcmp(argrest, "mad") == 0)
3014 msg_action = MSG_MARK_ALL_DELIVERED;
3016 else if (Ustrcmp(argrest, "md") == 0)
3018 msg_action = MSG_MARK_DELIVERED;
3019 one_msg_action = TRUE;
3021 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3022 else if (Ustrcmp(argrest, "set") == 0)
3024 msg_action = MSG_LOAD;
3025 one_msg_action = TRUE;
3027 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3028 else if (Ustrcmp(argrest, "vb") == 0)
3030 msg_action = MSG_SHOW_BODY;
3031 one_msg_action = TRUE;
3033 else if (Ustrcmp(argrest, "vc") == 0)
3035 msg_action = MSG_SHOW_COPY;
3036 one_msg_action = TRUE;
3038 else if (Ustrcmp(argrest, "vh") == 0)
3040 msg_action = MSG_SHOW_HEADER;
3041 one_msg_action = TRUE;
3043 else if (Ustrcmp(argrest, "vl") == 0)
3045 msg_action = MSG_SHOW_LOG;
3046 one_msg_action = TRUE;
3048 else { badarg = TRUE; break; }
3050 /* All the -Mxx options require at least one message id. */
3052 msg_action_arg = i + 1;
3053 if (msg_action_arg >= argc)
3054 exim_fail("exim: no message ids given after %s option\n", arg);
3056 /* Some require only message ids to follow */
3058 if (!one_msg_action)
3060 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3061 exim_fail("exim: malformed message id %s after %s option\n",
3063 goto END_ARG; /* Remaining args are ids */
3066 /* Others require only one message id, possibly followed by addresses,
3067 which will be handled as normal arguments. */
3071 if (!mac_ismsgid(argv[msg_action_arg]))
3072 exim_fail("exim: malformed message id %s after %s option\n",
3073 argv[msg_action_arg], arg);
3079 /* Some programs seem to call the -om option without the leading o;
3080 for sendmail it askes for "me too". Exim always does this. */
3083 if (*argrest) badarg = TRUE;
3087 /* -N: don't do delivery - a debugging option that stops transports doing
3088 their thing. It implies debugging at the D_v level. */
3093 f.dont_deliver = TRUE;
3094 debug_selector |= D_v;
3095 debug_file = stderr;
3101 /* -n: This means "don't alias" in sendmail, apparently.
3102 For normal invocations, it has no effect.
3103 It may affect some other options. */
3109 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3110 option to the specified value. This form uses long names. We need to handle
3111 -O option=value and -Ooption=value. */
3116 exim_fail("exim: string expected after -O\n");
3122 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3125 if (!*(alias_arg = argrest))
3126 if (i+1 < argc) alias_arg = argv[++i];
3127 else exim_fail("exim: string expected after -oA\n");
3130 /* -oB: Set a connection message max value for remote deliveries */
3133 uschar * p = argrest;
3135 if (i+1 < argc && isdigit((argv[i+1][0])))
3139 connection_max_messages = 1;
3146 exim_fail("exim: number expected after -oB\n");
3147 connection_max_messages = Uatoi(p);
3152 /* -odb: background delivery */
3155 if (Ustrcmp(argrest, "b") == 0)
3157 f.synchronous_delivery = FALSE;
3158 arg_queue_only = FALSE;
3159 queue_only_set = TRUE;
3162 /* -odd: testsuite-only: add no inter-process delays */
3164 else if (Ustrcmp(argrest, "d") == 0)
3165 f.testsuite_delays = FALSE;
3167 /* -odf: foreground delivery (smail-compatible option); same effect as
3168 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3171 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3173 f.synchronous_delivery = TRUE;
3174 arg_queue_only = FALSE;
3175 queue_only_set = TRUE;
3178 /* -odq: queue only */
3180 else if (Ustrcmp(argrest, "q") == 0)
3182 f.synchronous_delivery = FALSE;
3183 arg_queue_only = TRUE;
3184 queue_only_set = TRUE;
3187 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3188 but no remote delivery */
3190 else if (Ustrcmp(argrest, "qs") == 0)
3192 f.queue_smtp = TRUE;
3193 arg_queue_only = FALSE;
3194 queue_only_set = TRUE;
3199 /* -oex: Sendmail error flags. As these are also accepted without the
3200 leading -o prefix, for compatibility with vacation and other callers,
3201 they are handled with -e above. */
3203 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3204 -oitrue: Another sendmail syntax for the same */
3207 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3212 /* -oM*: Set various characteristics for an incoming message; actually
3213 acted on for trusted callers only. */
3218 exim_fail("exim: data expected after -oM%s\n", argrest);
3220 /* -oMa: Set sender host address */
3222 if (Ustrcmp(argrest, "a") == 0)
3223 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), TRUE);
3225 /* -oMaa: Set authenticator name */
3227 else if (Ustrcmp(argrest, "aa") == 0)
3228 sender_host_authenticated = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), TRUE);
3230 /* -oMas: setting authenticated sender */
3232 else if (Ustrcmp(argrest, "as") == 0)
3233 authenticated_sender = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3235 /* -oMai: setting authenticated id */
3237 else if (Ustrcmp(argrest, "ai") == 0)
3238 authenticated_id = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3240 /* -oMi: Set incoming interface address */
3242 else if (Ustrcmp(argrest, "i") == 0)
3243 interface_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), TRUE);
3245 /* -oMm: Message reference */
3247 else if (Ustrcmp(argrest, "m") == 0)
3249 if (!mac_ismsgid(argv[i+1]))
3250 exim_fail("-oMm must be a valid message ID\n");
3251 if (!f.trusted_config)
3252 exim_fail("-oMm must be called by a trusted user/config\n");
3253 message_reference = argv[++i];
3256 /* -oMr: Received protocol */
3258 else if (Ustrcmp(argrest, "r") == 0)
3260 if (received_protocol)
3261 exim_fail("received_protocol is set already\n");
3263 received_protocol = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), TRUE);
3265 /* -oMs: Set sender host name */
3267 else if (Ustrcmp(argrest, "s") == 0)
3268 sender_host_name = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), TRUE);
3270 /* -oMt: Set sender ident */
3272 else if (Ustrcmp(argrest, "t") == 0)
3274 sender_ident_set = TRUE;
3275 sender_ident = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), TRUE);
3278 /* Else a bad argument */
3285 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3286 seem to call this as -m (undocumented), so that is also accepted (see
3288 /* -oo: An ancient flag for old-style addresses which still seems to
3289 crop up in some calls (see in SCO). */
3293 if (*argrest) badarg = TRUE;
3296 /* -oP <name>: set pid file path for daemon
3297 -oPX: delete pid file of daemon */
3300 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3301 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3302 "(uid=%d euid=%d | %d)\n",
3303 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3304 if (!*argrest) override_pid_file_path = argv[++i];
3305 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3310 /* -or <n>: set timeout for non-SMTP acceptance
3311 -os <n>: set timeout for SMTP acceptance */
3316 int * tp = argrest[-1] == 'r'
3317 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3319 *tp = readconf_readtime(argrest, 0, FALSE);
3320 else if (i+1 < argc)
3321 *tp = readconf_readtime(argv[++i], 0, FALSE);
3324 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3328 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3329 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3332 if (*argrest) badarg = TRUE;
3333 else override_local_interfaces = string_copy_taint(exim_str_fail_toolong(argv[++i], 1024, "-oX"), TRUE);
3336 /* -oY: Override creation of daemon notifier socket */
3339 if (*argrest) badarg = TRUE;
3340 else notifier_socket = NULL;
3343 /* Unknown -o argument */
3351 /* -ps: force Perl startup; -pd force delayed Perl startup */
3355 if (*argrest == 's' && argrest[1] == 0)
3357 perl_start_option = 1;
3360 if (*argrest == 'd' && argrest[1] == 0)
3362 perl_start_option = -1;
3367 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3368 which sets the host protocol and host name */
3371 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3375 uschar * hn = Ustrchr(argrest, ':');
3377 if (received_protocol)
3378 exim_fail("received_protocol is set already\n");
3381 received_protocol = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), TRUE);
3384 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3385 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3386 sender_host_name = string_copy_taint(hn + 1, TRUE);
3393 receiving_message = FALSE;
3394 if (queue_interval >= 0)
3395 exim_fail("exim: -q specified more than once\n");
3397 /* -qq...: Do queue runs in a 2-stage manner */
3399 if (*argrest == 'q')
3401 f.queue_2stage = TRUE;
3405 /* -qi...: Do only first (initial) deliveries */
3407 if (*argrest == 'i')
3409 f.queue_run_first_delivery = TRUE;
3413 /* -qf...: Run the queue, forcing deliveries
3414 -qff..: Ditto, forcing thawing as well */
3416 if (*argrest == 'f')
3418 f.queue_run_force = TRUE;
3419 if (*++argrest == 'f')
3421 f.deliver_force_thaw = TRUE;
3426 /* -q[f][f]l...: Run the queue only on local deliveries */
3428 if (*argrest == 'l')
3430 f.queue_run_local = TRUE;
3434 /* -q[f][f][l][G<name>]... Work on the named queue */
3436 if (*argrest == 'G')
3439 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3440 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3441 queue_name = string_copyn(argrest, i);
3443 if (*argrest == '/') argrest++;
3446 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3447 only, optionally named, optionally starting from a given message id. */
3449 if (!(list_queue || count_queue))
3451 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3454 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3455 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3456 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3457 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3460 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3461 forced, optionally local only, optionally named. */
3463 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3465 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3469 case 'R': /* Synonymous with -qR... */
3471 const uschar *tainted_selectstr;
3473 receiving_message = FALSE;
3475 /* -Rf: As -R (below) but force all deliveries,
3476 -Rff: Ditto, but also thaw all frozen messages,
3477 -Rr: String is regex
3478 -Rrf: Regex and force
3479 -Rrff: Regex and force and thaw
3481 in all cases provided there are no further characters in this
3485 for (int i = 0; i < nelem(rsopts); i++)
3486 if (Ustrcmp(argrest, rsopts[i]) == 0)
3488 if (i != 2) f.queue_run_force = TRUE;
3489 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3490 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3491 argrest += Ustrlen(rsopts[i]);
3494 /* -R: Set string to match in addresses for forced queue run to
3495 pick out particular messages. */
3497 /* Avoid attacks from people providing very long strings, and do so before
3500 tainted_selectstr = argrest;
3501 else if (i+1 < argc)
3502 tainted_selectstr = argv[++i];
3504 exim_fail("exim: string expected after -R\n");
3505 deliver_selectstring = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), TRUE);
3509 /* -r: an obsolete synonym for -f (see above) */
3512 /* -S: Like -R but works on sender. */
3514 case 'S': /* Synonymous with -qS... */
3516 const uschar *tainted_selectstr;
3518 receiving_message = FALSE;
3520 /* -Sf: As -S (below) but force all deliveries,
3521 -Sff: Ditto, but also thaw all frozen messages,
3522 -Sr: String is regex
3523 -Srf: Regex and force
3524 -Srff: Regex and force and thaw
3526 in all cases provided there are no further characters in this
3530 for (int i = 0; i < nelem(rsopts); i++)
3531 if (Ustrcmp(argrest, rsopts[i]) == 0)
3533 if (i != 2) f.queue_run_force = TRUE;
3534 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3535 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3536 argrest += Ustrlen(rsopts[i]);
3539 /* -S: Set string to match in addresses for forced queue run to
3540 pick out particular messages. */
3543 tainted_selectstr = argrest;
3544 else if (i+1 < argc)
3545 tainted_selectstr = argv[++i];
3547 exim_fail("exim: string expected after -S\n");
3548 deliver_selectstring_sender = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), TRUE);
3552 /* -Tqt is an option that is exclusively for use by the testing suite.
3553 It is not recognized in other circumstances. It allows for the setting up
3554 of explicit "queue times" so that various warning/retry things can be
3555 tested. Otherwise variability of clock ticks etc. cause problems. */
3558 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3559 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3564 /* -t: Set flag to extract recipients from body of message. */
3567 if (!*argrest) extract_recipients = TRUE;
3569 /* -ti: Set flag to extract recipients from body of message, and also
3570 specify that dot does not end the message. */
3572 else if (Ustrcmp(argrest, "i") == 0)
3574 extract_recipients = TRUE;
3578 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3581 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3588 /* -U: This means "initial user submission" in sendmail, apparently. The
3589 doc claims that in future sendmail may refuse syntactically invalid
3590 messages instead of fixing them. For the moment, we just ignore it. */
3596 /* -v: verify things - this is a very low-level debugging */
3601 debug_selector |= D_v;
3602 debug_file = stderr;
3608 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3610 The -x flag tells the sendmail command that mail from a local
3611 mail program has National Language Support (NLS) extended characters
3612 in the body of the mail item. The sendmail command can send mail with
3613 extended NLS characters across networks that normally corrupts these
3616 As Exim is 8-bit clean, it just ignores this flag. */
3619 if (*argrest) badarg = TRUE;
3622 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3623 logs to that file. We swallow the parameter and otherwise ignore it. */
3628 exim_fail("exim: string expected after -X\n");
3631 /* -z: a line of text to log */
3636 log_oneline = string_copy_taint(exim_str_fail_toolong(argv[i], 2048, "-z logtext"), TRUE);
3638 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3641 /* All other initial characters are errors */
3646 } /* End of high-level switch statement */
3648 /* Failed to recognize the option, or syntax error */
3651 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3652 "option %s\n", arg);
3656 /* If -R or -S have been specified without -q, assume a single queue run. */
3658 if ( (deliver_selectstring || deliver_selectstring_sender)
3659 && queue_interval < 0)
3664 store_pool = old_pool;
3667 /* If usage_wanted is set we call the usage function - which never returns */
3668 if (usage_wanted) exim_usage(called_as);
3670 /* Arguments have been processed. Check for incompatibilities. */
3671 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3672 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3673 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3674 || filter_test != FTEST_NONE
3675 || msg_action_arg > 0 && !one_msg_action
3677 || ( msg_action_arg > 0
3678 && ( f.daemon_listen || queue_interval > 0 || list_options
3679 || checking && msg_action != MSG_LOAD
3680 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3682 || ( (f.daemon_listen || queue_interval > 0)
3683 && ( sender_address || list_options || list_queue || checking
3686 || f.daemon_listen && queue_interval == 0
3687 || f.inetd_wait_mode && queue_interval >= 0
3689 && ( checking || smtp_input || extract_recipients
3690 || filter_test != FTEST_NONE || bi_option
3692 || ( verify_address_mode
3693 && ( f.address_test_mode || smtp_input || extract_recipients
3694 || filter_test != FTEST_NONE || bi_option
3696 || ( f.address_test_mode
3697 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3701 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3703 || deliver_selectstring && queue_interval < 0
3704 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3706 exim_fail("exim: incompatible command-line options or arguments\n");
3708 /* If debugging is set up, set the file and the file descriptor to pass on to
3709 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3710 to run in the foreground. */
3712 if (debug_selector != 0)
3714 debug_file = stderr;
3715 debug_fd = fileno(debug_file);
3716 f.background_daemon = FALSE;
3717 testharness_pause_ms(100); /* lets caller finish */
3718 if (debug_selector != D_v) /* -v only doesn't show this */
3720 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3721 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3723 if (!version_printed)
3724 show_whats_supported(stderr);
3728 /* When started with root privilege, ensure that the limits on the number of
3729 open files and the number of processes (where that is accessible) are
3730 sufficiently large, or are unset, in case Exim has been called from an
3731 environment where the limits are screwed down. Not all OS have the ability to
3732 change some of these limits. */
3736 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3742 #ifdef RLIMIT_NOFILE
3743 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3745 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3747 rlp.rlim_cur = rlp.rlim_max = 0;
3750 /* I originally chose 1000 as a nice big number that was unlikely to
3751 be exceeded. It turns out that some older OS have a fixed upper limit of
3754 if (rlp.rlim_cur < 1000)
3756 rlp.rlim_cur = rlp.rlim_max = 1000;
3757 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3759 rlp.rlim_cur = rlp.rlim_max = 256;
3760 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3761 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3768 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3770 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3772 rlp.rlim_cur = rlp.rlim_max = 0;
3775 # ifdef RLIM_INFINITY
3776 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3778 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3780 if (rlp.rlim_cur < 1000)
3782 rlp.rlim_cur = rlp.rlim_max = 1000;
3784 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3785 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3791 /* Exim is normally entered as root (but some special configurations are
3792 possible that don't do this). However, it always spins off sub-processes that
3793 set their uid and gid as required for local delivery. We don't want to pass on
3794 any extra groups that root may belong to, so we want to get rid of them all at
3797 We need to obey setgroups() at this stage, before possibly giving up root
3798 privilege for a changed configuration file, but later on we might need to
3799 check on the additional groups for the admin user privilege - can't do that
3800 till after reading the config, which might specify the exim gid. Therefore,
3801 save the group list here first. */
3803 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3804 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3806 /* There is a fundamental difference in some BSD systems in the matter of
3807 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3808 known not to be different. On the "different" systems there is a single group
3809 list, and the first entry in it is the current group. On all other versions of
3810 Unix there is a supplementary group list, which is in *addition* to the current
3811 group. Consequently, to get rid of all extraneous groups on a "standard" system
3812 you pass over 0 groups to setgroups(), while on a "different" system you pass
3813 over a single group - the current group, which is always the first group in the
3814 list. Calling setgroups() with zero groups on a "different" system results in
3815 an error return. The following code should cope with both types of system.
3817 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3818 the "setgroups() with zero groups" - and changes the egid.
3819 Thanks to that we had to stash the original_egid above, for use below
3820 in the call to exim_setugid().
3822 However, if this process isn't running as root, setgroups() can't be used
3823 since you have to be root to run it, even if throwing away groups.
3824 Except, sigh, for Hurd - where you can.
3825 Not being root here happens only in some unusual configurations. */
3828 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3829 && setgroups(0, NULL) != 0
3831 && setgroups(1, group_list) != 0)
3832 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3834 /* If the configuration file name has been altered by an argument on the
3835 command line (either a new file name or a macro definition) and the caller is
3836 not root, or if this is a filter testing run, remove any setuid privilege the
3837 program has and run as the underlying user.
3839 The exim user is locked out of this, which severely restricts the use of -C
3842 Otherwise, set the real ids to the effective values (should be root unless run
3843 from inetd, which it can either be root or the exim uid, if one is configured).
3845 There is a private mechanism for bypassing some of this, in order to make it
3846 possible to test lots of configurations automatically, without having either to
3847 recompile each time, or to patch in an actual configuration file name and other
3848 values (such as the path name). If running in the test harness, pretend that
3849 configuration file changes and macro definitions haven't happened. */
3852 (!f.trusted_config || /* Config changed, or */
3853 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3854 real_uid != root_uid && /* Not root, and */
3855 !f.running_in_test_harness /* Not fudged */
3857 expansion_test /* expansion testing */
3859 filter_test != FTEST_NONE) /* Filter testing */
3861 setgroups(group_count, group_list);
3862 exim_setugid(real_uid, real_gid, FALSE,
3863 US"-C, -D, -be or -bf forces real uid");
3864 removed_privilege = TRUE;
3866 /* In the normal case when Exim is called like this, stderr is available
3867 and should be used for any logging information because attempts to write
3868 to the log will usually fail. To arrange this, we unset really_exim. However,
3869 if no stderr is available there is no point - we might as well have a go
3870 at the log (if it fails, syslog will be written).
3872 Note that if the invoker is Exim, the logs remain available. Messing with
3873 this causes unlogged successful deliveries. */
3875 if (log_stderr && real_uid != exim_uid)
3876 f.really_exim = FALSE;
3879 /* Privilege is to be retained for the moment. It may be dropped later,
3880 depending on the job that this Exim process has been asked to do. For now, set
3881 the real uid to the effective so that subsequent re-execs of Exim are done by a
3885 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3887 /* If testing a filter, open the file(s) now, before wasting time doing other
3888 setups and reading the message. */
3890 if (filter_test & FTEST_SYSTEM)
3891 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3892 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3895 if (filter_test & FTEST_USER)
3896 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3897 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3900 /* Initialise lookup_list
3901 If debugging, already called above via version reporting.
3902 In either case, we initialise the list of available lookups while running
3903 as root. All dynamically modules are loaded from a directory which is
3904 hard-coded into the binary and is code which, if not a module, would be
3905 part of Exim already. Ability to modify the content of the directory
3906 is equivalent to the ability to modify a setuid binary!
3908 This needs to happen before we read the main configuration. */
3911 /*XXX this excrescence could move to the testsuite standard config setup file */
3913 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3916 /* Read the main runtime configuration data; this gives up if there
3917 is a failure. It leaves the configuration file open so that the subsequent
3918 configuration data for delivery can be read if needed.
3920 NOTE: immediately after opening the configuration file we change the working
3921 directory to "/"! Later we change to $spool_directory. We do it there, because
3922 during readconf_main() some expansion takes place already. */
3924 /* Store the initial cwd before we change directories. Can be NULL if the
3925 dir has already been unlinked. */
3926 initial_cwd = os_getcwd(NULL, 0);
3927 if (!initial_cwd && errno)
3928 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
3930 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
3931 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
3934 -be[m] expansion test -
3935 -b[fF] filter test new
3937 -bmalware malware_test_file new
3939 -brw rewrite test new
3941 -bv[s] address verify -
3943 -bP <option> (except -bP config, which sets list_config)
3945 If any of these options is set, we suppress warnings about configuration
3946 issues (currently about tls_advertise_hosts and keep_environment not being
3950 int old_pool = store_pool;
3951 #ifdef MEASURE_TIMING
3952 struct timeval t0, diff;
3953 (void)gettimeofday(&t0, NULL);
3956 store_pool = POOL_CONFIG;
3957 readconf_main(checking || list_options);
3958 store_pool = old_pool;
3960 #ifdef MEASURE_TIMING
3961 report_time_since(&t0, US"readconf_main (delta)");
3965 /* Now in directory "/" */
3967 if (cleanup_environment() == FALSE)
3968 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3971 /* If an action on specific messages is requested, or if a daemon or queue
3972 runner is being started, we need to know if Exim was called by an admin user.
3973 This is the case if the real user is root or exim, or if the real group is
3974 exim, or if one of the supplementary groups is exim or a group listed in
3975 admin_groups. We don't fail all message actions immediately if not admin_user,
3976 since some actions can be performed by non-admin users. Instead, set admin_user
3977 for later interrogation. */
3979 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3980 f.admin_user = TRUE;
3982 for (int i = 0; i < group_count && !f.admin_user; i++)
3983 if (group_list[i] == exim_gid)
3984 f.admin_user = TRUE;
3985 else if (admin_groups)
3986 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3987 if (admin_groups[j] == group_list[i])
3988 f.admin_user = TRUE;
3990 /* Another group of privileged users are the trusted users. These are root,
3991 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3992 are permitted to specify sender_addresses with -f on the command line, and
3993 other message parameters as well. */
3995 if (real_uid == root_uid || real_uid == exim_uid)
3996 f.trusted_caller = TRUE;
4000 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4001 if (trusted_users[i] == real_uid)
4002 f.trusted_caller = TRUE;
4005 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4006 if (trusted_groups[i] == real_gid)
4007 f.trusted_caller = TRUE;
4008 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4009 if (trusted_groups[i] == group_list[j])
4010 f.trusted_caller = TRUE;
4013 /* At this point, we know if the user is privileged and some command-line
4014 options become possibly impermissible, depending upon the configuration file. */
4016 if (checking && commandline_checks_require_admin && !f.admin_user)
4017 exim_fail("exim: those command-line flags are set to require admin\n");
4019 /* Handle the decoding of logging options. */
4021 decode_bits(log_selector, log_selector_size, log_notall,
4022 log_selector_string, log_options, log_options_count, US"log", 0);
4026 debug_printf("configuration file is %s\n", config_main_filename);
4027 debug_printf("log selectors =");
4028 for (int i = 0; i < log_selector_size; i++)
4029 debug_printf(" %08x", log_selector[i]);
4033 /* If domain literals are not allowed, check the sender address that was
4034 supplied with -f. Ditto for a stripped trailing dot. */
4038 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4039 exim_fail("exim: bad -f address \"%s\": domain literals not "
4040 "allowed\n", sender_address);
4041 if (f_end_dot && !strip_trailing_dot)
4042 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4043 "(trailing dot not allowed)\n", sender_address);
4046 /* See if an admin user overrode our logging. */
4048 if (cmdline_syslog_name)
4051 syslog_processname = cmdline_syslog_name;
4052 log_file_path = string_copy(CUS"syslog");
4055 /* not a panic, non-privileged users should not be able to spam paniclog */
4057 "exim: you lack sufficient privilege to specify syslog process name\n");
4059 /* Paranoia check of maximum lengths of certain strings. There is a check
4060 on the length of the log file path in log.c, which will come into effect
4061 if there are any calls to write the log earlier than this. However, if we
4062 get this far but the string is very long, it is better to stop now than to
4063 carry on and (e.g.) receive a message and then have to collapse. The call to
4064 log_write() from here will cause the ultimate panic collapse if the complete
4065 file name exceeds the buffer length. */
4067 if (Ustrlen(log_file_path) > 200)
4068 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4069 "log_file_path is longer than 200 chars: aborting");
4071 if (Ustrlen(pid_file_path) > 200)
4072 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4073 "pid_file_path is longer than 200 chars: aborting");
4075 if (Ustrlen(spool_directory) > 200)
4076 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4077 "spool_directory is longer than 200 chars: aborting");
4079 /* Length check on the process name given to syslog for its TAG field,
4080 which is only permitted to be 32 characters or less. See RFC 3164. */
4082 if (Ustrlen(syslog_processname) > 32)
4083 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4084 "syslog_processname is longer than 32 chars: aborting");
4089 log_write(0, LOG_MAIN, "%s", log_oneline);
4090 return EXIT_SUCCESS;
4093 return EXIT_FAILURE;
4095 /* In some operating systems, the environment variable TMPDIR controls where
4096 temporary files are created; Exim doesn't use these (apart from when delivering
4097 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4098 If TMPDIR is found in the environment, reset it to the value defined in the
4099 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4100 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4101 EXIM_TMPDIR by the build scripts.
4105 if (environ) for (uschar ** p = USS environ; *p; p++)
4106 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4108 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4109 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4111 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4115 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4116 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4117 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4118 called by a user who has set the TZ variable. This then affects the timestamps
4119 in log files and in Received: headers, and any created Date: header lines. The
4120 required timezone is settable in the configuration file, so nothing can be done
4121 about this earlier - but hopefully nothing will normally be logged earlier than
4122 this. We have to make a new environment if TZ is wrong, but don't bother if
4123 timestamps_utc is set, because then all times are in UTC anyway. */
4125 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4126 f.timestamps_utc = TRUE;
4129 uschar *envtz = US getenv("TZ");
4131 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4132 : timezone_string != NULL
4135 uschar **p = USS environ;
4139 if (environ) while (*p++) count++;
4140 if (!envtz) count++;
4141 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4142 if (environ) for (p = USS environ; *p; p++)
4143 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4144 if (timezone_string)
4146 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4147 sprintf(CS *newp++, "TZ=%s", timezone_string);
4152 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4153 tod_stamp(tod_log));
4157 /* Handle the case when we have removed the setuid privilege because of -C or
4158 -D. This means that the caller of Exim was not root.
4160 There is a problem if we were running as the Exim user. The sysadmin may
4161 expect this case to retain privilege because "the binary was called by the
4162 Exim user", but it hasn't, because either the -D option set macros, or the
4163 -C option set a non-trusted configuration file. There are two possibilities:
4165 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4166 to do message deliveries. Thus, the fact that it is running as a
4167 non-privileged user is plausible, and might be wanted in some special
4168 configurations. However, really_exim will have been set false when
4169 privilege was dropped, to stop Exim trying to write to its normal log
4170 files. Therefore, re-enable normal log processing, assuming the sysadmin
4171 has set up the log directory correctly.
4173 (2) If deliver_drop_privilege is not set, the configuration won't work as
4174 apparently intended, and so we log a panic message. In order to retain
4175 root for -C or -D, the caller must either be root or be invoking a
4176 trusted configuration file (when deliver_drop_privilege is false). */
4178 if ( removed_privilege
4179 && (!f.trusted_config || opt_D_used)
4180 && real_uid == exim_uid)
4181 if (deliver_drop_privilege)
4182 f.really_exim = TRUE; /* let logging work normally */
4184 log_write(0, LOG_MAIN|LOG_PANIC,
4185 "exim user lost privilege for using %s option",
4186 f.trusted_config? "-D" : "-C");
4188 /* Start up Perl interpreter if Perl support is configured and there is a
4189 perl_startup option, and the configuration or the command line specifies
4190 initializing starting. Note that the global variables are actually called
4191 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4194 if (perl_start_option != 0)
4195 opt_perl_at_start = (perl_start_option > 0);
4196 if (opt_perl_at_start && opt_perl_startup != NULL)
4199 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4200 if ((errstr = init_perl(opt_perl_startup)))
4201 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4202 opt_perl_started = TRUE;
4204 #endif /* EXIM_PERL */
4206 /* Log the arguments of the call if the configuration file said so. This is
4207 a debugging feature for finding out what arguments certain MUAs actually use.
4208 Don't attempt it if logging is disabled, or if listing variables or if
4209 verifying/testing addresses or expansions. */
4211 if ( (debug_selector & D_any || LOGGING(arguments))
4212 && f.really_exim && !list_options && !checking)
4214 uschar *p = big_buffer;
4215 Ustrcpy(p, US"cwd= (failed)");
4222 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4223 p += Ustrlen(CCS p);
4226 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4228 for (int i = 0; i < argc; i++)
4230 int len = Ustrlen(argv[i]);
4231 const uschar *printing;
4233 if (p + len + 8 >= big_buffer + big_buffer_size)
4235 Ustrcpy(p, US" ...");
4236 log_write(0, LOG_MAIN, "%s", big_buffer);
4237 Ustrcpy(big_buffer, US"...");
4240 printing = string_printing(argv[i]);
4241 if (!*printing) quote = US"\"";
4244 const uschar *pp = printing;
4246 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4248 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4249 (p - big_buffer) - 4), printing, quote);
4252 if (LOGGING(arguments))
4253 log_write(0, LOG_MAIN, "%s", big_buffer);
4255 debug_printf("%s\n", big_buffer);
4258 /* Set the working directory to be the top-level spool directory. We don't rely
4259 on this in the code, which always uses fully qualified names, but it's useful
4260 for core dumps etc. Don't complain if it fails - the spool directory might not
4261 be generally accessible and calls with the -C option (and others) have lost
4262 privilege by now. Before the chdir, we try to ensure that the directory exists.
4265 if (Uchdir(spool_directory) != 0)
4267 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4268 (void) Uchdir(spool_directory);
4271 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4272 alias file. Exim doesn't have such a concept, but this call is screwed into
4273 Sun's YP makefiles. Handle this by calling a configured script, as the real
4274 user who called Exim. The -oA option can be used to pass an argument to the
4279 (void) fclose(config_file);
4280 if (bi_command && *bi_command)
4284 argv[i++] = bi_command;
4285 if (alias_arg) argv[i++] = alias_arg;
4288 setgroups(group_count, group_list);
4289 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4291 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4292 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4294 execv(CS argv[0], (char *const *)argv);
4295 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4299 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4304 /* We moved the admin/trusted check to be immediately after reading the
4305 configuration file. We leave these prints here to ensure that syslog setup,
4306 logfile setup, and so on has already happened. */
4308 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4309 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4311 /* Only an admin user may start the daemon or force a queue run in the default
4312 configuration, but the queue run restriction can be relaxed. Only an admin
4313 user may request that a message be returned to its sender forthwith. Only an
4314 admin user may specify a debug level greater than D_v (because it might show
4315 passwords, etc. in lookup queries). Only an admin user may request a queue
4316 count. Only an admin user can use the test interface to scan for email
4317 (because Exim will be in the spool dir and able to look at mails). */
4321 BOOL debugset = (debug_selector & ~D_v) != 0;
4322 if ( deliver_give_up || f.daemon_listen || malware_test_file
4323 || count_queue && queue_list_requires_admin
4324 || list_queue && queue_list_requires_admin
4325 || queue_interval >= 0 && prod_requires_admin
4326 || queue_name_dest && prod_requires_admin
4327 || debugset && !f.running_in_test_harness
4329 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4332 /* If the real user is not root or the exim uid, the argument for passing
4333 in an open TCP/IP connection for another message is not permitted, nor is
4334 running with the -N option for any delivery action, unless this call to exim is
4335 one that supplied an input message, or we are using a patched exim for
4336 regression testing. */
4338 if ( real_uid != root_uid && real_uid != exim_uid
4339 && ( continue_hostname
4341 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4343 && !f.running_in_test_harness
4345 exim_fail("exim: Permission denied\n");
4347 /* If the caller is not trusted, certain arguments are ignored when running for
4348 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4349 Note that authority for performing certain actions on messages is tested in the
4350 queue_action() function. */
4352 if (!f.trusted_caller && !checking)
4354 sender_host_name = sender_host_address = interface_address =
4355 sender_ident = received_protocol = NULL;
4356 sender_host_port = interface_port = 0;
4357 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4360 /* If a sender host address is set, extract the optional port number off the
4361 end of it and check its syntax. Do the same thing for the interface address.
4362 Exim exits if the syntax is bad. */
4366 if (sender_host_address)
4367 sender_host_port = check_port(sender_host_address);
4368 if (interface_address)
4369 interface_port = check_port(interface_address);
4372 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4375 if (f.trusted_caller)
4377 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4378 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4381 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4384 /* If an SMTP message is being received check to see if the standard input is a
4385 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4386 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4391 union sockaddr_46 inetd_sock;
4392 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4393 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4395 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4396 if (family == AF_INET || family == AF_INET6)
4398 union sockaddr_46 interface_sock;
4399 size = sizeof(interface_sock);
4401 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4402 interface_address = host_ntoa(-1, &interface_sock, NULL,
4405 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4407 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4410 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4411 NULL, &sender_host_port);
4412 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4413 "inetd is not supported when mua_wrapper is set");
4417 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4422 /* If the load average is going to be needed while receiving a message, get it
4423 now for those OS that require the first call to os_getloadavg() to be done as
4424 root. There will be further calls later for each message received. */
4426 #ifdef LOAD_AVG_NEEDS_ROOT
4427 if ( receiving_message
4428 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4429 load_average = OS_GETLOADAVG();
4432 /* The queue_only configuration option can be overridden by -odx on the command
4433 line, except that if queue_only_override is false, queue_only cannot be unset
4434 from the command line. */
4436 if (queue_only_set && (queue_only_override || arg_queue_only))
4437 queue_only = arg_queue_only;
4439 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4442 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4443 if (arg_smtp_receive_timeout >= 0)
4444 smtp_receive_timeout = arg_smtp_receive_timeout;
4446 /* If Exim was started with root privilege, unless we have already removed the
4447 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4448 except when starting the daemon or doing some kind of delivery or address
4449 testing (-bt). These are the only cases when root need to be retained. We run
4450 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4451 retained only for starting the daemon. We always do the initgroups() in this
4452 situation (controlled by the TRUE below), in order to be as close as possible
4453 to the state Exim usually runs in. */
4455 if ( !unprivileged /* originally had root AND */
4456 && !removed_privilege /* still got root AND */
4457 && !f.daemon_listen /* not starting the daemon */
4458 && queue_interval <= 0 /* (either kind of daemon) */
4459 && ( /* AND EITHER */
4460 deliver_drop_privilege /* requested unprivileged */
4462 queue_interval < 0 /* not running the queue */
4463 && ( msg_action_arg < 0 /* and */
4464 || msg_action != MSG_DELIVER /* not delivering */
4466 && (!checking || !f.address_test_mode) /* not address checking */
4467 && !rcpt_verify_quota /* and not quota checking */
4469 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4471 /* When we are retaining a privileged uid, we still change to the exim gid. */
4476 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4477 rv = setgid(exim_gid);
4478 /* Impact of failure is that some stuff might end up with an incorrect group.
4479 We track this for failures from root, since any attempt to change privilege
4480 by root should succeed and failures should be examined. For non-root,
4481 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4482 no need to complain then. */
4484 if (!(unprivileged || removed_privilege))
4485 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4488 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4489 (long int)exim_gid, strerror(errno));
4493 /* Handle a request to scan a file for malware */
4494 if (malware_test_file)
4496 #ifdef WITH_CONTENT_SCAN
4498 set_process_info("scanning file for malware");
4499 if ((result = malware_in_file(malware_test_file)) == FAIL)
4501 printf("No malware found.\n");
4506 printf("Malware lookup returned non-okay/fail: %d\n", result);
4510 printf("Malware found: %s\n", malware_name);
4512 printf("Malware scan detected malware of unknown name.\n");
4514 printf("Malware scanning not enabled at compile time.\n");
4519 /* Handle a request to list the delivery queue */
4523 set_process_info("listing the queue");
4524 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4528 /* Handle a request to count the delivery queue */
4532 set_process_info("counting the queue");
4533 fprintf(stdout, "%u\n", queue_count());
4537 /* Handle actions on specific messages, except for the force delivery and
4538 message load actions, which are done below. Some actions take a whole list of
4539 message ids, which are known to continue up to the end of the arguments. Others
4540 take a single message id and then operate on the recipients list. */
4542 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4544 int yield = EXIT_SUCCESS;
4545 set_process_info("acting on specified messages");
4547 /* ACL definitions may be needed when removing a message (-Mrm) because
4548 event_action gets expanded */
4550 if (msg_action == MSG_REMOVE)
4552 int old_pool = store_pool;
4553 store_pool = POOL_CONFIG;
4555 store_pool = old_pool;
4556 store_writeprotect(POOL_CONFIG);
4559 if (!one_msg_action)
4561 for (i = msg_action_arg; i < argc; i++)
4562 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4563 yield = EXIT_FAILURE;
4566 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4567 default: printf("\n"); break;
4571 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4572 recipients_arg)) yield = EXIT_FAILURE;
4576 /* We used to set up here to skip reading the ACL section, on
4577 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4578 Now, since the intro of the ${acl } expansion, ACL definitions may be
4579 needed in transports so we lost the optimisation. */
4582 int old_pool = store_pool;
4583 #ifdef MEASURE_TIMING
4584 struct timeval t0, diff;
4585 (void)gettimeofday(&t0, NULL);
4588 store_pool = POOL_CONFIG;
4590 store_pool = old_pool;
4592 /* -be can add macro definitions, needing to link to the macro structure
4593 chain. Otherwise, make the memory used for config data readonly. */
4595 if (!expansion_test)
4596 store_writeprotect(POOL_CONFIG);
4598 #ifdef MEASURE_TIMING
4599 report_time_since(&t0, US"readconf_rest (delta)");
4603 /* Handle a request to check quota */
4604 if (rcpt_verify_quota)
4605 if (real_uid != root_uid && real_uid != exim_uid)
4606 exim_fail("exim: Permission denied\n");
4607 else if (recipients_arg >= argc)
4608 exim_fail("exim: missing recipient for quota check\n");
4611 verify_quota(argv[recipients_arg]);
4612 exim_exit(EXIT_SUCCESS);
4615 /* Handle the -brt option. This is for checking out retry configurations.
4616 The next three arguments are a domain name or a complete address, and
4617 optionally two error numbers. All it does is to call the function that
4618 scans the retry configuration data. */
4620 if (test_retry_arg >= 0)
4622 retry_config *yield;
4623 int basic_errno = 0;
4625 const uschar *s1, *s2;
4627 if (test_retry_arg >= argc)
4629 printf("-brt needs a domain or address argument\n");
4630 exim_exit(EXIT_FAILURE);
4632 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4635 /* If the first argument contains no @ and no . it might be a local user
4636 or it might be a single-component name. Treat as a domain. */
4638 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4640 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4641 "being \ntreated as a one-component domain, not as a local part.\n\n",
4645 /* There may be an optional second domain arg. */
4647 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4648 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4650 /* The final arg is an error name */
4652 if (test_retry_arg < argc)
4654 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4656 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4659 printf("%s\n", CS error);
4660 return EXIT_FAILURE;
4663 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4664 code > 100 as an error is for matching codes to the decade. Turn them into
4665 a real error code, off the decade. */
4667 if (basic_errno == ERRNO_MAIL4XX ||
4668 basic_errno == ERRNO_RCPT4XX ||
4669 basic_errno == ERRNO_DATA4XX)
4671 int code = (more_errno >> 8) & 255;
4673 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4674 else if (code > 100)
4675 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4679 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4680 printf("No retry information found\n");
4683 more_errno = yield->more_errno;
4684 printf("Retry rule: %s ", yield->pattern);
4686 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4688 printf("quota%s%s ",
4689 (more_errno > 0)? "_" : "",
4690 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4692 else if (yield->basic_errno == ECONNREFUSED)
4694 printf("refused%s%s ",
4695 (more_errno > 0)? "_" : "",
4696 (more_errno == 'M')? "MX" :
4697 (more_errno == 'A')? "A" : "");
4699 else if (yield->basic_errno == ETIMEDOUT)
4702 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4704 if (more_errno != 0) printf("_%s",
4705 (more_errno == 'M')? "MX" : "A");
4708 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4709 printf("auth_failed ");
4712 for (retry_rule * r = yield->rules; r; r = r->next)
4714 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4715 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4721 printf(",%d.", x/1000);
4735 exim_exit(EXIT_SUCCESS);
4738 /* Handle a request to list one or more configuration options */
4739 /* If -n was set, we suppress some information */
4744 set_process_info("listing variables");
4745 if (recipients_arg >= argc)
4746 fail = !readconf_print(US"all", NULL, flag_n);
4747 else for (i = recipients_arg; i < argc; i++)
4750 (Ustrcmp(argv[i], "router") == 0 ||
4751 Ustrcmp(argv[i], "transport") == 0 ||
4752 Ustrcmp(argv[i], "authenticator") == 0 ||
4753 Ustrcmp(argv[i], "macro") == 0 ||
4754 Ustrcmp(argv[i], "environment") == 0))
4756 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4760 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4762 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4767 set_process_info("listing config");
4768 exim_exit(readconf_print(US"config", NULL, flag_n)
4769 ? EXIT_SUCCESS : EXIT_FAILURE);
4773 /* Initialise subsystems as required. */
4777 /* Handle a request to deliver one or more messages that are already on the
4778 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4779 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4781 Delivery of specific messages is typically used for a small number when
4782 prodding by hand (when the option forced_delivery will be set) or when
4783 re-execing to regain root privilege. Each message delivery must happen in a
4784 separate process, so we fork a process for each one, and run them sequentially
4785 so that debugging output doesn't get intertwined, and to avoid spawning too
4786 many processes if a long list is given. However, don't fork for the last one;
4787 this saves a process in the common case when Exim is called to deliver just one
4790 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4792 if (prod_requires_admin && !f.admin_user)
4794 fprintf(stderr, "exim: Permission denied\n");
4795 exim_exit(EXIT_FAILURE);
4797 set_process_info("delivering specified messages");
4798 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4799 for (i = msg_action_arg; i < argc; i++)
4803 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4804 that runs into a later copy into the untainted global message_id[] */
4805 /*XXX Do we need a length limit check here? */
4807 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4808 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4810 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4811 exim_underbar_exit(EXIT_SUCCESS);
4815 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4817 exim_exit(EXIT_FAILURE);
4821 exim_exit(EXIT_SUCCESS);
4825 /* If only a single queue run is requested, without SMTP listening, we can just
4826 turn into a queue runner, with an optional starting message id. */
4828 if (queue_interval == 0 && !f.daemon_listen)
4830 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4831 start_queue_run_id ? US" starting at " : US"",
4832 start_queue_run_id ? start_queue_run_id: US"",
4833 stop_queue_run_id ? US" stopping at " : US"",
4834 stop_queue_run_id ? stop_queue_run_id : US"");
4836 set_process_info("running the '%s' queue (single queue run)", queue_name);
4838 set_process_info("running the queue (single queue run)");
4839 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4840 exim_exit(EXIT_SUCCESS);
4844 /* Find the login name of the real user running this process. This is always
4845 needed when receiving a message, because it is written into the spool file. It
4846 may also be used to construct a from: or a sender: header, and in this case we
4847 need the user's full name as well, so save a copy of it, checked for RFC822
4848 syntax and munged if necessary, if it hasn't previously been set by the -F
4849 argument. We may try to get the passwd entry more than once, in case NIS or
4850 other delays are in evidence. Save the home directory for use in filter testing
4855 if ((pw = getpwuid(real_uid)) != NULL)
4857 originator_login = string_copy(US pw->pw_name);
4858 originator_home = string_copy(US pw->pw_dir);
4860 /* If user name has not been set by -F, set it from the passwd entry
4861 unless -f has been used to set the sender address by a trusted user. */
4863 if (!originator_name)
4865 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4867 uschar *name = US pw->pw_gecos;
4868 uschar *amp = Ustrchr(name, '&');
4871 /* Most Unix specify that a '&' character in the gecos field is
4872 replaced by a copy of the login name, and some even specify that
4873 the first character should be upper cased, so that's what we do. */
4878 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4879 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4880 buffer[loffset] = toupper(buffer[loffset]);
4884 /* If a pattern for matching the gecos field was supplied, apply
4885 it and then expand the name string. */
4887 if (gecos_pattern && gecos_name)
4889 const pcre2_code *re;
4890 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4892 if (regex_match_and_setup(re, name, 0, -1))
4894 uschar *new_name = expand_string(gecos_name);
4898 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4899 "gecos field \"%s\"\n", new_name, name);
4902 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4903 "\"%s\": %s\n", gecos_name, expand_string_message);
4905 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4906 "gecos field \"%s\"\n", gecos_pattern, name);
4907 store_free((void *)re);
4909 originator_name = string_copy(name);
4912 /* A trusted caller has used -f but not -F */
4914 else originator_name = US"";
4917 /* Break the retry loop */
4922 if (++i > finduser_retries) break;
4926 /* If we cannot get a user login, log the incident and give up, unless the
4927 configuration specifies something to use. When running in the test harness,
4928 any setting of unknown_login overrides the actual name. */
4930 if (!originator_login || f.running_in_test_harness)
4934 originator_login = expand_string(unknown_login);
4935 if (!originator_name && unknown_username)
4936 originator_name = expand_string(unknown_username);
4937 if (!originator_name) originator_name = US"";
4939 if (!originator_login)
4940 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4944 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4947 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
4949 /* If a message is created by this call of Exim, the uid/gid of its originator
4950 are those of the caller. These values are overridden if an existing message is
4951 read in from the spool. */
4953 originator_uid = real_uid;
4954 originator_gid = real_gid;
4956 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4957 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4959 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4960 returns. We leave this till here so that the originator_ fields are available
4961 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4964 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4968 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4969 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4970 "mua_wrapper is set");
4973 # ifndef DISABLE_TLS
4974 /* This also checks that the library linkage is working and we can call
4975 routines in it, so call even if tls_require_ciphers is unset */
4977 # ifdef MEASURE_TIMING
4978 struct timeval t0, diff;
4979 (void)gettimeofday(&t0, NULL);
4981 if (!tls_dropprivs_validate_require_cipher(FALSE))
4983 # ifdef MEASURE_TIMING
4984 report_time_since(&t0, US"validate_ciphers (delta)");
4992 /* If the sender ident has not been set (by a trusted caller) set it to
4993 the caller. This will get overwritten below for an inetd call. If a trusted
4994 caller has set it empty, unset it. */
4996 if (!sender_ident) sender_ident = originator_login;
4997 else if (!*sender_ident) sender_ident = NULL;
4999 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5000 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5001 originator_* variables set. */
5003 if (test_rewrite_arg >= 0)
5005 f.really_exim = FALSE;
5006 if (test_rewrite_arg >= argc)
5008 printf("-brw needs an address argument\n");
5009 exim_exit(EXIT_FAILURE);
5011 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5012 exim_exit(EXIT_SUCCESS);
5015 /* A locally-supplied message is considered to be coming from a local user
5016 unless a trusted caller supplies a sender address with -f, or is passing in the
5017 message via SMTP (inetd invocation or otherwise). */
5019 if ( !sender_address && !smtp_input
5020 || !f.trusted_caller && filter_test == FTEST_NONE)
5022 f.sender_local = TRUE;
5024 /* A trusted caller can supply authenticated_sender and authenticated_id
5025 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5026 defaults except when host checking. */
5028 if (!authenticated_sender && !host_checking)
5029 authenticated_sender = string_sprintf("%s@%s", originator_login,
5030 qualify_domain_sender);
5031 if (!authenticated_id && !host_checking)
5032 authenticated_id = originator_login;
5035 /* Trusted callers are always permitted to specify the sender address.
5036 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5037 is specified is the empty address. However, if a trusted caller does not
5038 specify a sender address for SMTP input, we leave sender_address unset. This
5039 causes the MAIL commands to be honoured. */
5041 if ( !smtp_input && !sender_address
5042 || !receive_check_set_sender(sender_address))
5044 /* Either the caller is not permitted to set a general sender, or this is
5045 non-SMTP input and the trusted caller has not set a sender. If there is no
5046 sender, or if a sender other than <> is set, override with the originator's
5047 login (which will get qualified below), except when checking things. */
5049 if ( !sender_address /* No sender_address set */
5051 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5052 !checking)) /* Not running tests, including filter tests */
5054 sender_address = originator_login;
5055 f.sender_address_forced = FALSE;
5056 sender_address_domain = 0;
5060 /* Remember whether an untrusted caller set the sender address */
5062 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5064 /* Ensure that the sender address is fully qualified unless it is the empty
5065 address, which indicates an error message, or doesn't exist (root caller, smtp
5066 interface, no -f argument). */
5068 if (sender_address && *sender_address && sender_address_domain == 0)
5069 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5070 qualify_domain_sender);
5072 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5074 /* Handle a request to verify a list of addresses, or test them for delivery.
5075 This must follow the setting of the sender address, since routers can be
5076 predicated upon the sender. If no arguments are given, read addresses from
5077 stdin. Set debug_level to at least D_v to get full output for address testing.
5080 if (verify_address_mode || f.address_test_mode)
5083 int flags = vopt_qualify;
5085 if (verify_address_mode)
5087 if (!verify_as_sender) flags |= vopt_is_recipient;
5088 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5093 flags |= vopt_is_recipient;
5094 debug_selector |= D_v;
5095 debug_file = stderr;
5096 debug_fd = fileno(debug_file);
5097 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5100 if (recipients_arg < argc)
5101 while (recipients_arg < argc)
5103 /* Supplied addresses are tainted since they come from a user */
5104 uschar * s = string_copy_taint(exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), TRUE);
5107 BOOL finished = FALSE;
5108 uschar *ss = parse_find_address_end(s, FALSE);
5109 if (*ss == ',') *ss = 0; else finished = TRUE;
5110 test_address(s, flags, &exit_value);
5113 while (*++s == ',' || isspace(*s)) ;
5119 uschar * s = get_stdinput(NULL, NULL);
5121 test_address(string_copy_taint(exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), TRUE), flags, &exit_value);
5125 exim_exit(exit_value);
5128 /* Handle expansion checking. Either expand items on the command line, or read
5129 from stdin if there aren't any. If -Mset was specified, load the message so
5130 that its variables can be used, but restrict this facility to admin users.
5131 Otherwise, if -bem was used, read a message from stdin. */
5135 dns_init(FALSE, FALSE, FALSE);
5136 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5140 exim_fail("exim: permission denied\n");
5141 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5142 /* Checking the length of the ID is sufficient to validate it.
5143 Get an untainted version so file opens can be done. */
5144 message_id = string_copy_taint(message_id, FALSE);
5146 spoolname = string_sprintf("%s-H", message_id);
5147 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5148 printf ("Failed to load message datafile %s\n", message_id);
5149 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5150 printf ("Failed to load message %s\n", message_id);
5153 /* Read a test message from a file. We fudge it up to be on stdin, saving
5154 stdin itself for later reading of expansion strings. */
5156 else if (expansion_test_message)
5158 int save_stdin = dup(0);
5159 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5161 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5164 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5165 message_ended = END_NOTENDED;
5166 read_message_body(receive_msg(extract_recipients));
5167 message_linecount += body_linecount;
5168 (void)dup2(save_stdin, 0);
5169 (void)close(save_stdin);
5170 clearerr(stdin); /* Required by Darwin */
5173 /* Only admin users may see config-file macros this way */
5175 if (!f.admin_user) macros_user = macros = mlast = NULL;
5177 /* Allow $recipients for this testing */
5179 f.enable_dollar_recipients = TRUE;
5181 /* Expand command line items */
5183 if (recipients_arg < argc)
5184 while (recipients_arg < argc)
5185 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5191 char *(*fn_readline)(const char *) = NULL;
5192 void (*fn_addhist)(const char *) = NULL;
5196 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5199 while (s = get_stdinput(fn_readline, fn_addhist))
5200 expansion_test_line(s);
5203 if (dlhandle) dlclose(dlhandle);
5207 /* The data file will be open after -Mset */
5209 if (deliver_datafile >= 0)
5211 (void)close(deliver_datafile);
5212 deliver_datafile = -1;
5215 exim_exit(EXIT_SUCCESS);
5219 /* The active host name is normally the primary host name, but it can be varied
5220 for hosts that want to play several parts at once. We need to ensure that it is
5221 set for host checking, and for receiving messages. */
5223 smtp_active_hostname = primary_hostname;
5224 if (raw_active_hostname != NULL)
5226 uschar *nah = expand_string(raw_active_hostname);
5229 if (!f.expand_string_forcedfail)
5230 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5231 "(smtp_active_hostname): %s", raw_active_hostname,
5232 expand_string_message);
5234 else if (nah[0] != 0) smtp_active_hostname = nah;
5237 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5238 given IP address so that the blocking and relay configuration can be tested.
5239 Unless a sender_ident was set by -oMt, we discard it (the default is the
5240 caller's login name). An RFC 1413 call is made only if we are running in the
5241 test harness and an incoming interface and both ports are specified, because
5242 there is no TCP/IP call to find the ident for. */
5249 if (!sender_ident_set)
5251 sender_ident = NULL;
5252 if (f.running_in_test_harness && sender_host_port
5253 && interface_address && interface_port)
5254 verify_get_ident(1223); /* note hardwired port number */
5257 /* In case the given address is a non-canonical IPv6 address, canonicalize
5258 it. The code works for both IPv4 and IPv6, as it happens. */
5260 size = host_aton(sender_host_address, x);
5261 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
5262 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5264 /* Now set up for testing */
5266 host_build_sender_fullhost();
5270 f.sender_local = FALSE;
5271 f.sender_host_notsocket = TRUE;
5272 debug_file = stderr;
5273 debug_fd = fileno(debug_file);
5274 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5275 "**** but without any ident (RFC 1413) callback.\n"
5276 "**** This is not for real!\n\n",
5277 sender_host_address);
5279 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5280 if (verify_check_host(&hosts_connection_nolog) == OK)
5281 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5282 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5284 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5285 because a log line has already been written for all its failure exists
5286 (usually "connection refused: <reason>") and writing another one is
5287 unnecessary clutter. */
5289 if (smtp_start_session())
5292 for (; (reset_point = store_mark()); store_reset(reset_point))
5294 if (smtp_setup_msg() <= 0) break;
5295 if (!receive_msg(FALSE)) break;
5297 return_path = sender_address = NULL;
5298 dnslist_domain = dnslist_matched = NULL;
5299 #ifndef DISABLE_DKIM
5300 dkim_cur_signer = NULL;
5303 deliver_localpart_orig = NULL;
5304 deliver_domain_orig = NULL;
5305 callout_address = sending_ip_address = NULL;
5306 deliver_localpart_data = deliver_domain_data =
5307 recipient_data = sender_data = NULL;
5308 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5312 exim_exit(EXIT_SUCCESS);
5316 /* Arrange for message reception if recipients or SMTP were specified;
5317 otherwise complain unless a version print (-bV) happened or this is a filter
5318 verification test or info dump.
5319 In the former case, show the configuration file name. */
5321 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5323 if (version_printed)
5325 if (Ustrchr(config_main_filelist, ':'))
5326 printf("Configuration file search path is %s\n", config_main_filelist);
5327 printf("Configuration file is %s\n", config_main_filename);
5328 return EXIT_SUCCESS;
5331 if (info_flag != CMDINFO_NONE)
5333 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5334 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5337 if (filter_test == FTEST_NONE)
5338 exim_usage(called_as);
5342 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5343 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5344 that we are not called from inetd, because that is rejected above. The
5345 following configuration settings are forced here:
5347 (1) Synchronous delivery (-odi)
5348 (2) Errors to stderr (-oep == -oeq)
5349 (3) No parallel remote delivery
5350 (4) Unprivileged delivery
5352 We don't force overall queueing options because there are several of them;
5353 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5354 to override any SMTP queueing. */
5358 f.synchronous_delivery = TRUE;
5359 arg_error_handling = ERRORS_STDERR;
5360 remote_max_parallel = 1;
5361 deliver_drop_privilege = TRUE;
5362 f.queue_smtp = FALSE;
5363 queue_smtp_domains = NULL;
5365 message_utf8_downconvert = -1; /* convert-if-needed */
5370 /* Prepare to accept one or more new messages on the standard input. When a
5371 message has been read, its id is returned in message_id[]. If doing immediate
5372 delivery, we fork a delivery process for each received message, except for the
5373 last one, where we can save a process switch.
5375 It is only in non-smtp mode that error_handling is allowed to be changed from
5376 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5377 sendmail error modes other than -oem ever actually used? Later: yes.) */
5379 if (!smtp_input) error_handling = arg_error_handling;
5381 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5382 logging being sent down the socket and make an identd call to get the
5385 else if (f.is_inetd)
5387 (void)fclose(stderr);
5388 exim_nullstd(); /* Re-open to /dev/null */
5389 verify_get_ident(IDENT_PORT);
5390 host_build_sender_fullhost();
5391 set_process_info("handling incoming connection from %s via inetd",
5395 /* If the sender host address has been set, build sender_fullhost if it hasn't
5396 already been done (which it will have been for inetd). This caters for the
5397 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5398 so that the test for IP options is skipped for -bs input. */
5400 if (sender_host_address && !sender_fullhost)
5402 host_build_sender_fullhost();
5403 set_process_info("handling incoming connection from %s via -oMa",
5405 f.sender_host_notsocket = TRUE;
5408 /* Otherwise, set the sender host as unknown except for inetd calls. This
5409 prevents host checking in the case of -bs not from inetd and also for -bS. */
5411 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5413 /* If stdout does not exist, then dup stdin to stdout. This can happen
5414 if exim is started from inetd. In this case fd 0 will be set to the socket,
5415 but fd 1 will not be set. This also happens for passed SMTP channels. */
5417 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5419 /* Set up the incoming protocol name and the state of the program. Root is
5420 allowed to force received protocol via the -oMr option above. If we have come
5421 via inetd, the process info has already been set up. We don't set
5422 received_protocol here for smtp input, as it varies according to
5423 batch/HELO/EHLO/AUTH/TLS. */
5427 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5428 smtp_batched_input? "batched " : "",
5429 sender_address ? sender_address : originator_login);
5433 int old_pool = store_pool;
5434 store_pool = POOL_PERM;
5435 if (!received_protocol)
5436 received_protocol = string_sprintf("local%s", called_as);
5437 store_pool = old_pool;
5438 set_process_info("accepting a local non-SMTP message from <%s>",
5442 /* Initialize the session_local_queue-only flag (this will be ignored if
5443 mua_wrapper is set) */
5446 session_local_queue_only = queue_only;
5448 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5449 the spool if so configured. On failure, we must not attempt to send an error
5450 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5451 error code is given.) */
5453 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5454 exim_fail("exim: insufficient disk space\n");
5456 /* If this is smtp input of any kind, real or batched, handle the start of the
5459 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5460 because a log line has already been written for all its failure exists
5461 (usually "connection refused: <reason>") and writing another one is
5462 unnecessary clutter. */
5468 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5469 if (verify_check_host(&hosts_connection_nolog) == OK)
5470 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5471 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5472 if (!smtp_start_session())
5475 exim_exit(EXIT_SUCCESS);
5479 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5480 (we handle buferring so as to have visibility of fill level). */
5484 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5485 if (expand_string_message)
5486 if (thismessage_size_limit == -1)
5487 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5488 "message_size_limit: %s", expand_string_message);
5490 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5491 "message_size_limit: %s", expand_string_message);
5493 setvbuf(stdin, NULL, _IONBF, 0);
5496 /* Loop for several messages when reading SMTP input. If we fork any child
5497 processes, we don't want to wait for them unless synchronous delivery is
5498 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5499 same as SIG_DFL, despite the fact that documentation often lists the default as
5500 "ignore". This is a confusing area. This is what I know:
5502 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5503 processes that complete simply to go away without ever becoming defunct. You
5504 can't then wait for them - but we don't want to wait for them in the
5505 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5506 happen for all OS (e.g. *BSD is different).
5508 But that's not the end of the story. Some (many? all?) systems have the
5509 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5510 has by default, so it seems that the difference is merely one of default
5511 (compare restarting vs non-restarting signals).
5513 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5514 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5515 of the loop below. Paranoia rules.
5517 February 2003: That's *still* not the end of the story. There are now versions
5518 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5519 process then calls waitpid(), a grumble is written to the system log, because
5520 this is logically inconsistent. In other words, it doesn't like the paranoia.
5521 As a consequence of this, the waitpid() below is now excluded if we are sure
5522 that SIG_IGN works. */
5524 if (!f.synchronous_delivery)
5527 struct sigaction act;
5528 act.sa_handler = SIG_IGN;
5529 sigemptyset(&(act.sa_mask));
5530 act.sa_flags = SA_NOCLDWAIT;
5531 sigaction(SIGCHLD, &act, NULL);
5533 signal(SIGCHLD, SIG_IGN);
5537 /* Save the current store pool point, for resetting at the start of
5538 each message, and save the real sender address, if any. */
5540 real_sender_address = sender_address;
5542 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5543 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5546 for (BOOL more = TRUE; more; )
5548 rmark reset_point = store_mark();
5551 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5552 input and build the recipients list, before calling receive_msg() to read the
5553 message proper. Whatever sender address is given in the SMTP transaction is
5554 often ignored for local senders - we use the actual sender, which is normally
5555 either the underlying user running this process or a -f argument provided by
5556 a trusted caller. It is saved in real_sender_address. The test for whether to
5557 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5562 if ((rc = smtp_setup_msg()) > 0)
5564 if (real_sender_address != NULL &&
5565 !receive_check_set_sender(sender_address))
5567 sender_address = raw_sender = real_sender_address;
5568 sender_address_unrewritten = NULL;
5571 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5572 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5573 the very end. The result of the ACL is ignored (as for other non-SMTP
5574 messages). It is run for its potential side effects. */
5576 if (smtp_batched_input && acl_not_smtp_start != NULL)
5578 uschar *user_msg, *log_msg;
5579 f.enable_dollar_recipients = TRUE;
5580 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5581 &user_msg, &log_msg);
5582 f.enable_dollar_recipients = FALSE;
5585 /* Now get the data for the message */
5587 more = receive_msg(extract_recipients);
5590 cancel_cutthrough_connection(TRUE, US"receive dropped");
5591 if (more) goto MORELOOP;
5592 smtp_log_no_mail(); /* Log no mail if configured */
5593 exim_exit(EXIT_FAILURE);
5598 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5599 smtp_log_no_mail(); /* Log no mail if configured */
5600 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5604 /* In the non-SMTP case, we have all the information from the command
5605 line, but must process it in case it is in the more general RFC822
5606 format, and in any case, to detect syntax errors. Also, it appears that
5607 the use of comma-separated lists as single arguments is common, so we
5608 had better support them. */
5613 int count = argc - recipients_arg;
5614 uschar **list = argv + recipients_arg;
5616 /* These options cannot be changed dynamically for non-SMTP messages */
5618 f.active_local_sender_retain = local_sender_retain;
5619 f.active_local_from_check = local_from_check;
5621 /* Save before any rewriting */
5623 raw_sender = string_copy(sender_address);
5625 /* Loop for each argument (supplied by user hence tainted) */
5627 for (int i = 0; i < count; i++)
5629 int start, end, domain;
5631 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5632 * We'll still want to cap it to something, just in case. */
5633 uschar * s = string_copy_taint(exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), TRUE);
5635 /* Loop for each comma-separated address */
5639 BOOL finished = FALSE;
5641 uschar *ss = parse_find_address_end(s, FALSE);
5643 if (*ss == ',') *ss = 0; else finished = TRUE;
5645 /* Check max recipients - if -t was used, these aren't recipients */
5647 if (recipients_max > 0 && ++rcount > recipients_max &&
5648 !extract_recipients)
5649 if (error_handling == ERRORS_STDERR)
5651 fprintf(stderr, "exim: too many recipients\n");
5652 exim_exit(EXIT_FAILURE);
5656 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5657 errors_sender_rc : EXIT_FAILURE;
5661 BOOL b = allow_utf8_domains;
5662 allow_utf8_domains = TRUE;
5665 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5669 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5670 else allow_utf8_domains = b;
5675 if (domain == 0 && !f.allow_unqualified_recipient)
5678 errmess = US"unqualified recipient address not allowed";
5682 if (error_handling == ERRORS_STDERR)
5684 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5685 string_printing(list[i]), errmess);
5686 exim_exit(EXIT_FAILURE);
5692 eblock.text1 = string_printing(list[i]);
5693 eblock.text2 = errmess;
5695 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5696 errors_sender_rc : EXIT_FAILURE;
5699 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5702 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5706 /* Show the recipients when debugging */
5710 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5711 if (recipients_list)
5713 debug_printf("Recipients:\n");
5714 for (int i = 0; i < recipients_count; i++)
5715 debug_printf(" %s\n", recipients_list[i].address);
5719 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5720 ignored; rejecting here would just add complication, and it can just as
5721 well be done later. Allow $recipients to be visible in the ACL. */
5723 if (acl_not_smtp_start)
5725 uschar *user_msg, *log_msg;
5726 f.enable_dollar_recipients = TRUE;
5727 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5728 &user_msg, &log_msg);
5729 f.enable_dollar_recipients = FALSE;
5732 /* Pause for a while waiting for input. If none received in that time,
5733 close the logfile, if we had one open; then if we wait for a long-running
5734 datasource (months, in one use-case) log rotation will not leave us holding
5737 if (!receive_timeout)
5738 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5741 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5742 will just read the headers for the message, and not write anything onto the
5745 message_ended = END_NOTENDED;
5746 more = receive_msg(extract_recipients);
5748 /* more is always FALSE here (not SMTP message) when reading a message
5749 for real; when reading the headers of a message for filter testing,
5750 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5752 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5753 } /* Non-SMTP message reception */
5755 /* If this is a filter testing run, there are headers in store, but
5756 no message on the spool. Run the filtering code in testing mode, setting
5757 the domain to the qualify domain and the local part to the current user,
5758 unless they have been set by options. The prefix and suffix are left unset
5759 unless specified. The the return path is set to to the sender unless it has
5760 already been set from a return-path header in the message. */
5762 if (filter_test != FTEST_NONE)
5764 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5765 deliver_domain_orig = deliver_domain;
5766 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5767 deliver_localpart_orig = deliver_localpart;
5768 deliver_localpart_prefix = US ftest_prefix;
5769 deliver_localpart_suffix = US ftest_suffix;
5770 deliver_home = originator_home;
5774 printf("Return-path copied from sender\n");
5775 return_path = string_copy(sender_address);
5778 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5779 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5781 receive_add_recipient(
5782 string_sprintf("%s%s%s@%s",
5783 ftest_prefix ? ftest_prefix : US"",
5785 ftest_suffix ? ftest_suffix : US"",
5786 deliver_domain), -1);
5788 printf("Recipient = %s\n", recipients_list[0].address);
5789 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5790 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5792 if (chdir("/")) /* Get away from wherever the user is running this from */
5794 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5795 exim_exit(EXIT_FAILURE);
5798 /* Now we run either a system filter test, or a user filter test, or both.
5799 In the latter case, headers added by the system filter will persist and be
5800 available to the user filter. We need to copy the filter variables
5803 if (filter_test & FTEST_SYSTEM)
5804 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5805 exim_exit(EXIT_FAILURE);
5807 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5809 if (filter_test & FTEST_USER)
5810 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5811 exim_exit(EXIT_FAILURE);
5813 exim_exit(EXIT_SUCCESS);
5816 /* Else act on the result of message reception. We should not get here unless
5817 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5818 will be TRUE. If it is not, check on the number of messages received in this
5821 if ( !session_local_queue_only
5822 && smtp_accept_queue_per_connection > 0
5823 && receive_messagecount > smtp_accept_queue_per_connection)
5825 session_local_queue_only = TRUE;
5826 queue_only_reason = 2;
5829 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5830 and queue_only_load is set, check that the load average is below it. If it is
5831 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5832 default), we put the whole session into queue_only mode. It then remains this
5833 way for any subsequent messages on the same SMTP connection. This is a
5834 deliberate choice; even though the load average may fall, it doesn't seem
5835 right to deliver later messages on the same call when not delivering earlier
5836 ones. However, there are odd cases where this is not wanted, so this can be
5837 changed by setting queue_only_load_latch false. */
5839 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5840 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5842 queue_only_reason = 3;
5843 if (queue_only_load_latch) session_local_queue_only = TRUE;
5846 /* If running as an MUA wrapper, all queueing options and freezing options
5850 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5852 /* Log the queueing here, when it will get a message id attached, but
5853 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5856 if (local_queue_only)
5858 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5859 switch(queue_only_reason)
5862 log_write(L_delay_delivery,
5863 LOG_MAIN, "no immediate delivery: more than %d messages "
5864 "received in one connection", smtp_accept_queue_per_connection);
5868 log_write(L_delay_delivery,
5869 LOG_MAIN, "no immediate delivery: load average %.2f",
5870 (double)load_average/1000.0);
5875 else if (f.queue_only_policy || f.deliver_freeze)
5876 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5878 /* Else do the delivery unless the ACL or local_scan() called for queue only
5879 or froze the message. Always deliver in a separate process. A fork failure is
5880 not a disaster, as the delivery will eventually happen on a subsequent queue
5881 run. The search cache must be tidied before the fork, as the parent will
5882 do it before exiting. The child will trigger a lookup failure and
5883 thereby defer the delivery if it tries to use (for example) a cached ldap
5884 connection that the parent has called unbind on. */
5891 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
5894 close_unwanted(); /* Close unwanted file descriptors and TLS */
5895 exim_nullstd(); /* Ensure std{in,out,err} exist */
5897 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5898 mode, deliver_drop_privilege is forced TRUE). */
5900 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5902 delivery_re_exec(CEE_EXEC_EXIT);
5903 /* Control does not return here. */
5906 /* No need to re-exec */
5908 rc = deliver_message(message_id, FALSE, FALSE);
5910 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5911 ? EXIT_SUCCESS : EXIT_FAILURE);
5916 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5917 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5918 "process: %s", strerror(errno));
5922 release_cutthrough_connection(US"msg passed for delivery");
5924 /* In the parent, wait if synchronous delivery is required. This will
5925 always be the case in MUA wrapper mode. */
5927 if (f.synchronous_delivery)
5930 while (wait(&status) != pid);
5931 if ((status & 0x00ff) != 0)
5932 log_write(0, LOG_MAIN|LOG_PANIC,
5933 "process %d crashed with signal %d while delivering %s",
5934 (int)pid, status & 0x00ff, message_id);
5935 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5940 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5941 automatically reaps children (see comments above the loop), clear away any
5942 finished subprocesses here, in case there are lots of messages coming in
5943 from the same source. */
5945 #ifndef SIG_IGN_WORKS
5946 while (waitpid(-1, NULL, WNOHANG) > 0);
5950 return_path = sender_address = NULL;
5951 authenticated_sender = NULL;
5952 deliver_localpart_orig = NULL;
5953 deliver_domain_orig = NULL;
5954 deliver_host = deliver_host_address = NULL;
5955 dnslist_domain = dnslist_matched = NULL;
5956 #ifdef WITH_CONTENT_SCAN
5957 malware_name = NULL;
5959 callout_address = NULL;
5960 sending_ip_address = NULL;
5961 deliver_localpart_data = deliver_domain_data =
5962 recipient_data = sender_data = NULL;
5964 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5966 store_reset(reset_point);
5969 exim_exit(EXIT_SUCCESS); /* Never returns */
5970 return 0; /* To stop compiler warning */