1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2024 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
17 #if defined(__GLIBC__) && !defined(__UCLIBC__)
18 # include <gnu/libc-version.h>
25 # include <execinfo.h>
29 # include <gnutls/gnutls.h>
30 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
35 extern void init_lookup_list(void);
36 extern void init_misc_mod_list(void);
40 /*************************************************
41 * Function interface to store functions *
42 *************************************************/
44 /* We need some real functions to pass to the PCRE regular expression library
45 for store allocation via Exim's store manager. The normal calls are actually
46 macros that pass over location information to make tracing easier. These
47 functions just interface to the standard macro calls. A good compiler will
48 optimize out the tail recursion and so not make them too expensive. */
51 function_store_malloc(PCRE2_SIZE size, void * tag)
54 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "excessive memory alloc request");
55 return store_malloc((int)size);
59 function_store_free(void * block, void * tag)
61 /* At least some version of pcre2 pass a null pointer */
62 if (block) store_free(block);
67 function_store_get(PCRE2_SIZE size, void * tag)
70 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "excessive memory alloc request");
71 return store_get((int)size, GET_UNTAINTED); /* loses track of taint */
75 function_store_nullfree(void * block, void * tag)
77 /* We cannot free memory allocated using store_get() */
83 /*************************************************
84 * Enums for cmdline interface *
85 *************************************************/
87 enum commandline_info { CMDINFO_NONE=0,
88 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
96 pcre_mlc_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
97 pcre_gen_ctx = pcre2_general_context_create(function_store_get, function_store_nullfree, NULL);
99 pcre_mlc_cmp_ctx = pcre2_compile_context_create(pcre_mlc_ctx);
100 pcre_gen_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
102 pcre_gen_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
108 /*************************************************
109 * Execute regular expression and set strings *
110 *************************************************/
112 /* This function runs a regular expression match, and sets up the pointers to
113 the matched substrings. The matched strings are copied so the lifetime of
114 the subject is not a problem. Matched strings will have the same taint status
115 as the subject string (this is not a de-taint method, and must not be made so
116 given the support for wildcards in REs).
119 re the compiled expression
120 subject the subject string
121 options additional PCRE options
122 setup if < 0 do full setup
123 if >= 0 setup from setup+1 onwards,
124 excluding the full matched string
126 Returns: TRUE if matched, or FALSE
130 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
132 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
133 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
134 PCRE_EOPT | options, md, pcre_gen_mtc_ctx);
137 if ((yield = (res >= 0)))
139 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
140 res = pcre2_get_ovector_count(md);
141 expand_nmax = setup < 0 ? 0 : setup + 1;
142 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
144 /* Although PCRE2 has a pcre2_substring_get_bynumber() conveneience, it
145 seems to return a bad pointer when a capture group had no data, eg. (.*)
146 matching zero letters. So use the underlying ovec and hope (!) that the
147 offsets are sane (including that case). Should we go further and range-
148 check each one vs. the subject string length? */
149 int off = matchnum * 2;
150 int len = ovec[off + 1] - ovec[off];
151 expand_nstring[expand_nmax] = string_copyn(subject + ovec[off], len);
152 expand_nlength[expand_nmax++] = len;
156 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
159 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
160 debug_printf_indent("pcre2: %s\n", errbuf);
162 /* pcre2_match_data_free(md); gen ctx needs no free */
167 /* Check just for match with regex. Uses the common memory-handling.
171 subject string to be checked
172 slen length of subject; -1 for nul-terminated
173 rptr pointer for matched string, copied, or NULL
175 Return: TRUE for a match.
179 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
181 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
182 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
183 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
184 0, PCRE_EOPT, md, pcre_gen_mtc_ctx);
185 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
191 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
194 /* pcre2_match_data_free(md); gen ctx needs no free */
200 /*************************************************
201 * Set up processing details *
202 *************************************************/
204 /* Save a text string for dumping when SIGUSR1 is received.
205 Do checks for overruns.
207 Arguments: format and arguments, as for printf()
212 set_process_info(const char * format, ...)
214 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
220 g = string_fmt_append(&gs, "%5d ", (int)getpid());
221 len = gstring_length(g);
222 va_start(ap, format);
223 if (!string_vformat(g, 0, format, ap))
226 g = string_cat(&gs, US"**** string overflowed buffer ****");
228 g = string_catn(g, US"\n", 1);
229 process_info_len = len_string_from_gstring(g, &s);
230 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
234 /***********************************************
235 * Handler for SIGTERM *
236 ***********************************************/
239 term_handler(int sig)
241 exim_exit(EXIT_FAILURE);
245 /***********************************************
246 * Handler for SIGSEGV *
247 ***********************************************/
249 #define STACKDUMP_MAX 24
254 void * buf[STACKDUMP_MAX];
256 int nptrs = backtrace(buf, STACKDUMP_MAX);
258 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace");
259 log_write(0, LOG_MAIN|LOG_PANIC, "---");
260 if ((ss = backtrace_symbols(buf, nptrs)))
262 for (int i = 0; i < nptrs; i++)
263 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s", ss[i]);
267 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s", strerror(errno));
268 log_write(0, LOG_MAIN|LOG_PANIC, "---");
276 segv_handler(int sig, siginfo_t * info, void * uctx)
280 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
281 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
282 switch (info->si_code)
284 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
285 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
286 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
287 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
292 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (deliberate trap)");
293 else if (US info->si_addr < US 4096)
294 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
296 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
297 if (process_info_len > 0)
298 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%s: %.*s)",
299 process_purpose, process_info_len, process_info);
301 signal(SIGSEGV, SIG_DFL);
306 segv_handler(int sig)
308 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
309 if (process_info_len > 0)
310 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
312 signal(SIGSEGV, SIG_DFL);
318 /*************************************************
319 * Handler for SIGUSR1 *
320 *************************************************/
322 /* SIGUSR1 causes any exim process to write to the process log details of
323 what it is currently doing. It will only be used if the OS is capable of
324 setting up a handler that causes automatic restarting of any system call
325 that is in progress at the time.
327 This function takes care to be signal-safe.
329 Argument: the signal number (SIGUSR1)
334 usr1_handler(int sig)
338 os_restarting_signal(sig, usr1_handler);
340 if (!process_log_path) return;
341 fd = log_open_as_exim(process_log_path);
343 /* If we are neither exim nor root, or if we failed to create the log file,
344 give up. There is not much useful we can do with errors, since we don't want
345 to disrupt whatever is going on outside the signal handler. */
349 (void)write(fd, process_info, process_info_len);
355 /*************************************************
357 *************************************************/
359 /* This handler is enabled most of the time that Exim is running. The handler
360 doesn't actually get used unless alarm() has been called to set a timer, to
361 place a time limit on a system call of some kind. When the handler is run, it
364 There are some other SIGALRM handlers that are used in special cases when more
365 than just a flag setting is required; for example, when reading a message's
366 input. These are normally set up in the code module that uses them, and the
367 SIGALRM handler is reset to this one afterwards.
369 Argument: the signal value (SIGALRM)
374 sigalrm_handler(int sig)
377 os_non_restarting_signal(SIGALRM, sigalrm_handler);
382 /*************************************************
383 * Sleep for a fractional time interval *
384 *************************************************/
386 /* This function is called by millisleep() and exim_wait_tick() to wait for a
387 period of time that may include a fraction of a second. The coding is somewhat
388 tedious. We do not expect setitimer() ever to fail, but if it does, the process
389 will wait for ever, so we panic in this instance. (There was a case of this
390 when a bug in a function that calls milliwait() caused it to pass invalid data.
391 That's when I added the check. :-)
393 We assume it to be not worth sleeping for under 50us; this value will
394 require revisiting as hardware advances. This avoids the issue of
395 a zero-valued timer setting meaning "never fire".
397 Argument: an itimerval structure containing the interval
402 milliwait(struct itimerval *itval)
405 sigset_t old_sigmask;
406 int save_errno = errno;
408 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
410 (void)sigemptyset(&sigmask); /* Empty mask */
411 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
412 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
413 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
414 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
415 "setitimer() failed: %s", strerror(errno));
416 (void)sigfillset(&sigmask); /* All signals */
417 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
418 (void)sigsuspend(&sigmask); /* Until SIGALRM */
419 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
421 sigalrm_seen = FALSE;
427 /*************************************************
428 * Millisecond sleep function *
429 *************************************************/
431 /* The basic sleep() function has a granularity of 1 second, which is too rough
432 in some cases - for example, when using an increasing delay to slow down
435 Argument: number of millseconds
442 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
443 .it_value = {.tv_sec = msec/1000,
444 .tv_usec = (msec % 1000) * 1000}};
450 /*************************************************
451 * Compare microsecond times *
452 *************************************************/
459 Returns: -1, 0, or +1
463 exim_tvcmp(struct timeval *t1, struct timeval *t2)
465 if (t1->tv_sec > t2->tv_sec) return +1;
466 if (t1->tv_sec < t2->tv_sec) return -1;
467 if (t1->tv_usec > t2->tv_usec) return +1;
468 if (t1->tv_usec < t2->tv_usec) return -1;
475 /*************************************************
476 * Clock tick wait function *
477 *************************************************/
479 #ifdef _POSIX_MONOTONIC_CLOCK
480 # ifdef CLOCK_BOOTTIME
481 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
483 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
486 /* Amount EXIM_CLOCK is behind realtime, at startup. */
487 static struct timespec offset_ts;
490 exim_clock_init(void)
493 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
494 (void)gettimeofday(&tv, NULL);
495 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
496 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
497 if (offset_ts.tv_nsec >= 0) return;
499 offset_ts.tv_nsec += 1000*1000*1000;
505 exim_gettime(struct timeval * tv)
507 #ifdef _POSIX_MONOTONIC_CLOCK
508 struct timespec now_ts;
510 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
512 now_ts.tv_sec += offset_ts.tv_sec;
513 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
516 now_ts.tv_nsec -= 1000*1000*1000;
518 tv->tv_sec = now_ts.tv_sec;
519 tv->tv_usec = now_ts.tv_nsec / 1000;
523 (void)gettimeofday(tv, NULL);
527 /* Exim uses a time + a pid to generate a unique identifier in two places: its
528 message IDs, and in file names for maildir deliveries. Because some OS now
529 re-use pids within the same second, sub-second times are now being used.
530 However, for absolute certainty, we must ensure the clock has ticked before
531 allowing the relevant process to complete. At the time of implementation of
532 this code (February 2003), the speed of processors is such that the clock will
533 invariably have ticked already by the time a process has done its job. This
534 function prepares for the time when things are faster - and it also copes with
535 clocks that go backwards.
538 prev_tv A timeval which was used to create uniqueness; its usec field
539 has been rounded down to the value of the resolution.
540 We want to be sure the current time is greater than this.
541 On return, updated to current (rounded down).
542 resolution The resolution that was used to divide the microseconds
543 (1 for maildir, larger for message ids)
549 exim_wait_tick(struct timeval * prev_tv, int resolution)
551 struct timeval now_tv;
552 long int now_true_usec;
554 exim_gettime(&now_tv);
555 now_true_usec = now_tv.tv_usec;
556 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
558 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
560 struct itimerval itval;
561 itval.it_interval.tv_sec = 0;
562 itval.it_interval.tv_usec = 0;
563 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
564 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
566 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
567 negative value for the microseconds is possible only in the case when "now"
568 is more than a second less than "tgt". That means that itval.it_value.tv_sec
569 is greater than zero. The following correction is therefore safe. */
571 if (itval.it_value.tv_usec < 0)
573 itval.it_value.tv_usec += 1000000;
574 itval.it_value.tv_sec -= 1;
577 DEBUG(D_transport|D_receive)
579 if (!f.running_in_test_harness)
581 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
582 prev_tv->tv_sec, (long) prev_tv->tv_usec,
583 now_tv.tv_sec, (long) now_tv.tv_usec);
584 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
585 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
591 /* Be prapared to go around if the kernel does not implement subtick
592 granularity (GNU Hurd) */
594 exim_gettime(&now_tv);
595 now_true_usec = now_tv.tv_usec;
596 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
604 /*************************************************
605 * Call fopen() with umask 777 and adjust mode *
606 *************************************************/
608 /* Exim runs with umask(0) so that files created with open() have the mode that
609 is specified in the open() call. However, there are some files, typically in
610 the spool directory, that are created with fopen(). They end up world-writeable
611 if no precautions are taken. Although the spool directory is not accessible to
612 the world, this is an untidiness. So this is a wrapper function for fopen()
613 that sorts out the mode of the created file.
616 filename the file name
617 options the fopen() options
618 mode the required mode
620 Returns: the fopened FILE or NULL
624 modefopen(const uschar *filename, const char *options, mode_t mode)
626 mode_t saved_umask = umask(0777);
627 FILE *f = Ufopen(filename, options);
628 (void)umask(saved_umask);
629 if (f != NULL) (void)fchmod(fileno(f), mode);
634 /*************************************************
635 * Ensure stdin, stdout, and stderr exist *
636 *************************************************/
638 /* Some operating systems grumble if an exec() happens without a standard
639 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
640 file will be opened and will use these fd values, and then some other bit of
641 code will assume, for example, that it can write error messages to stderr.
642 This function ensures that fds 0, 1, and 2 are open if they do not already
643 exist, by connecting them to /dev/null.
645 This function is also used to ensure that std{in,out,err} exist at all times,
646 so that if any library that Exim calls tries to use them, it doesn't crash.
657 for (int i = 0; i <= 2; i++)
659 if (fstat(i, &statbuf) < 0 && errno == EBADF)
661 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
662 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
663 string_open_failed("/dev/null", NULL));
664 if (devnull != i) (void)dup2(devnull, i);
667 if (devnull > 2) (void)close(devnull);
673 /*************************************************
674 * Close unwanted file descriptors for delivery *
675 *************************************************/
677 /* This function is called from a new process that has been forked to deliver
678 an incoming message, either directly, or using exec.
680 We want any smtp input streams to be closed in this new process. However, it
681 has been observed that using fclose() here causes trouble. When reading in -bS
682 input, duplicate copies of messages have been seen. The files will be sharing a
683 file pointer with the parent process, and it seems that fclose() (at least on
684 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
685 least sometimes. Hence we go for closing the underlying file descriptors.
687 If TLS is active, we want to shut down the TLS library, but without molesting
688 the parent's SSL connection.
690 For delivery of a non-SMTP message, we want to close stdin and stdout (and
691 stderr unless debugging) because the calling process might have set them up as
692 pipes and be waiting for them to close before it waits for the submission
693 process to terminate. If they aren't closed, they hold up the calling process
694 until the initial delivery process finishes, which is not what we want.
696 Exception: We do want it for synchronous delivery!
698 And notwithstanding all the above, if D_resolver is set, implying resolver
699 debugging, leave stdout open, because that's where the resolver writes its
702 When we close stderr (which implies we've also closed stdout), we also get rid
703 of any controlling terminal.
715 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
717 (void)close(fileno(smtp_in));
718 (void)close(fileno(smtp_out));
723 (void)close(0); /* stdin */
724 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
725 if (debug_selector == 0) /* stderr */
727 if (!f.synchronous_delivery)
740 /*************************************************
742 *************************************************/
744 /* This function sets a new uid and gid permanently, optionally calling
745 initgroups() to set auxiliary groups. There are some special cases when running
746 Exim in unprivileged modes. In these situations the effective uid will not be
747 root; if we already have the right effective uid/gid, and don't need to
748 initialize any groups, leave things as they are.
753 igflag TRUE if initgroups() wanted
754 msg text to use in debugging output and failure log
756 Returns: nothing; bombs out on failure
760 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
762 uid_t euid = geteuid();
763 gid_t egid = getegid();
765 if (euid == root_uid || euid != uid || egid != gid || igflag)
767 /* At least one OS returns +1 for initgroups failure, so just check for
772 struct passwd *pw = getpwuid(uid);
774 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
775 "no passwd entry for uid=%ld", (long int)uid);
777 if (initgroups(pw->pw_name, gid) != 0)
778 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
779 (long int)uid, strerror(errno));
782 if (setgid(gid) < 0 || setuid(uid) < 0)
783 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
784 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
787 /* Debugging output included uid/gid and all groups */
791 int group_count, save_errno;
792 gid_t group_list[EXIM_GROUPLIST_SIZE];
793 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
794 (long int)geteuid(), (long int)getegid(), (long int)getpid());
795 group_count = getgroups(nelem(group_list), group_list);
797 debug_printf(" auxiliary group list:");
799 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
800 else if (group_count < 0)
801 debug_printf(" <error: %s>", strerror(save_errno));
802 else debug_printf(" <none>");
810 /*************************************************
812 *************************************************/
814 /* Exim exits via this function so that it always clears up any open
820 Returns: does not return
829 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
830 ">>>>>>>>>>>>>>>>\n",
831 (int)getpid(), process_purpose, rc);
837 exim_underbar_exit(int rc)
841 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
842 ">>>>>>>>>>>>>>>>\n",
843 (int)getpid(), process_purpose, rc);
849 /* Print error string, then die */
851 exim_fail(const char * fmt, ...)
855 vfprintf(stderr, fmt, ap);
860 /* fail if a length is too long */
862 exim_len_fail_toolong(int itemlen, int maxlen, const char * description)
864 if (itemlen <= maxlen)
866 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
867 itemlen, maxlen, description);
871 /* only pass through the string item back to the caller if it's short enough */
872 static inline const uschar *
873 exim_str_fail_toolong(const uschar * item, int maxlen, const char * description)
876 exim_fail("exim: bad item for: %s\n", description);
877 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
881 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
882 of chown()/fchown(). See src/functions.h for more explanation */
884 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
886 int saved_errno = errno; /* from the preceeding chown call */
888 log_write(0, LOG_MAIN|LOG_PANIC,
889 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
890 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
891 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
893 /* I leave this here, commented, in case the "bug"(?) comes up again.
894 It is not an Exim bug, but we can provide a workaround.
900 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
902 if (buf.st_uid == owner && buf.st_gid == group) return 0;
903 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
905 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
913 /* Bump the index for argv, checking for overflow,
914 and return the argument. */
916 static const uschar *
917 next_argv(const uschar ** argv, int * pi, int argc, const uschar * where)
920 if (++i >= argc) exim_fail("exim: bad item for: %s\n", where);
921 return argv[*pi = i];
925 /*************************************************
926 * Extract port from host address *
927 *************************************************/
929 /* Called to extract the port from the values given to -oMa and -oMi.
930 It also checks the syntax of the address, and terminates it before the
931 port data when a port is extracted.
934 address the address, with possible port on the end
936 Returns: the port, or zero if there isn't one
937 bombs out on a syntax error
941 check_port(uschar *address)
943 int port = host_address_extract_port(address);
944 if (string_is_ip_address(address, NULL) == 0)
945 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
951 /*************************************************
952 * Test/verify an address *
953 *************************************************/
955 /* This function is called by the -bv and -bt code. It extracts a working
956 address from a full RFC 822 address. This isn't really necessary per se, but it
957 has the effect of collapsing source routes.
961 flags flag bits for verify_address()
962 exit_value to be set for failures
968 test_address(uschar *s, int flags, int *exit_value)
970 int start, end, domain;
971 uschar *parse_error = NULL;
972 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
976 fprintf(stdout, "syntax error: %s\n", parse_error);
981 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
982 -1, -1, NULL, NULL, NULL);
983 if (rc == FAIL) *exit_value = 2;
984 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
990 /*************************************************
991 * Show supported features *
992 *************************************************/
995 show_string(BOOL is_stdout, gstring * g)
997 const uschar * s = string_from_gstring(g);
999 if (is_stdout) fputs(CCS s, stdout);
1000 else debug_printf("%s", s);
1005 show_db_version(gstring * g)
1007 g = string_cat(g, US"Hints DB:\n");
1008 #ifdef DB_VERSION_STRING
1011 g = string_fmt_append(g, " Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
1012 g = string_fmt_append(g, " Runtime: %s\n",
1013 db_version(NULL, NULL, NULL));
1016 g = string_fmt_append(g, " Berkeley DB: %s\n", DB_VERSION_STRING);
1018 #elif defined(BTREEVERSION) && defined(HASHVERSION)
1020 g = string_cat(g, US" Probably Berkeley DB version 1.8x (native mode)\n");
1022 g = string_cat(g, US" Probably Berkeley DB version 1.8x (compatibility mode)\n");
1025 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
1026 g = string_cat(g, US" Probably ndbm\n");
1027 #elif defined(USE_SQLITE)
1028 g = string_cat(g, US" Using sqlite3\n");
1029 #elif defined(USE_TDB)
1030 g = string_cat(g, US" Using tdb\n");
1033 g = string_cat(g, US" Probably GDBM (native mode)\n");
1035 g = string_cat(g, US" Probably GDBM (compatibility mode)\n");
1043 lookup_show_supported(gstring * g)
1045 gstring * b = NULL, * d = NULL;
1047 #ifdef LOOKUP_LSEARCH
1048 # if LOOKUP_LSEARCH!=2
1049 b = string_cat(b, US" lsearch wildlsearch nwildlsearch iplsearch");
1051 d = string_cat(d, US" lsearch wildlsearch nwildlsearch iplsearch");
1056 b = string_cat(b, US" cdb");
1058 d = string_cat(d, US" cdb");
1063 b = string_cat(b, US" dbm dbmjz dbmnz");
1065 d = string_cat(d, US" dbm dbmjz dbmnz");
1069 # if LOOKUP_DNSDB!=2
1070 b = string_cat(b, US" dnsdb");
1072 d = string_cat(d, US" dnsdb");
1075 #ifdef LOOKUP_DSEARCH
1076 # if LOOKUP_DSEARCH!=2
1077 b = string_cat(b, US" dsearch");
1079 d = string_cat(d, US" dsearch");
1083 # if LOOKUP_IBASE!=2
1084 b = string_cat(b, US" ibase");
1086 d = string_cat(d, US" ibase");
1091 b = string_cat(b, US" json");
1093 d = string_cat(d, US" json");
1098 b = string_cat(b, US" ldap ldapdn ldapm");
1100 d = string_cat(d, US" ldap ldapdn ldapm");
1105 b = string_cat(b, US" lmdb");
1107 d = string_cat(d, US" lmdb");
1111 # if LOOKUP_MYSQL!=2
1112 b = string_cat(b, US" mysql");
1114 d = string_cat(d, US" mysql");
1119 b = string_cat(b, US" nis nis0");
1121 d = string_cat(d, US" nis nis0");
1124 #ifdef LOOKUP_NISPLUS
1125 # if LOOKUP_NISPLUS!=2
1126 b = string_cat(b, US" nisplus");
1128 d = string_cat(d, US" nisplus");
1131 #ifdef LOOKUP_ORACLE
1132 # if LOOKUP_ORACLE!=2
1133 b = string_cat(b, US" oracle");
1135 d = string_cat(d, US" oracle");
1138 #ifdef LOOKUP_PASSWD
1139 # if LOOKUP_PASSWD!=2
1140 b = string_cat(b, US" passwd");
1142 d = string_cat(d, US" passwd");
1146 # if LOOKUP_PGSQL!=2
1147 b = string_cat(b, US" pgsql");
1149 d = string_cat(d, US" pgsql");
1153 # if LOOKUP_REDIS!=2
1154 b = string_cat(b, US" redis");
1156 d = string_cat(d, US" redis");
1161 b = string_cat(b, US" spf");
1163 d = string_cat(d, US" spf");
1166 #ifdef LOOKUP_SQLITE
1167 # if LOOKUP_SQLITE!=2
1168 b = string_cat(b, US" sqlite");
1170 d = string_cat(d, US" sqlite");
1173 #ifdef LOOKUP_TESTDB
1174 # if LOOKUP_TESTDB!=2
1175 b = string_cat(b, US" testdb");
1177 d = string_cat(d, US" testdb");
1180 #ifdef LOOKUP_WHOSON
1181 # if LOOKUP_WHOSON!=2
1182 b = string_cat(b, US" whoson");
1184 d = string_cat(d, US" whoson");
1188 if (b) g = string_fmt_append(g, "Lookups (built-in):%Y\n", b);
1189 if (d) g = string_fmt_append(g, "Lookups (dynamic): %Y\n", d);
1195 lookup_version_report_cb(uschar * name, uschar * ptr, void * ctx)
1197 const lookup_info * li = (lookup_info *)ptr;
1198 gstring ** gp = ctx;
1200 if (li->version_report)
1201 *gp = li->version_report(*gp);
1205 /* This function is called for -bV/--version and for -d to output the optional
1206 features of the current Exim binary.
1208 Arguments: BOOL, true for stdout else debug channel
1213 show_whats_supported(BOOL is_stdout)
1215 rmark reset_point = store_mark();
1218 DEBUG(D_any) {} else g = show_db_version(g);
1220 g = string_cat(g, US"Support for:");
1221 #ifdef WITH_CONTENT_SCAN
1222 g = string_cat(g, US" Content_Scanning");
1224 #ifndef DISABLE_EXIM_FILTER
1225 g = string_cat(g, US" Exim_filter");
1227 #ifndef DISABLE_SIEVE_FILTER
1228 g = string_cat(g, US" Sieve_filter");
1230 #ifdef SUPPORT_CRYPTEQ
1231 g = string_cat(g, US" crypteq");
1233 #ifdef EXPAND_DLFUNC
1234 g = string_cat(g, US" Expand_dlfunc");
1237 g = string_cat(g, US" iconv()");
1240 g = string_cat(g, US" IPv6");
1243 g = string_cat(g, US" PAM");
1246 g = string_cat(g, US" Perl");
1249 g = string_cat(g, US" GnuTLS");
1251 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1252 g = string_cat(g, US" move_frozen_messages");
1255 g = string_cat(g, US" OpenSSL");
1257 #if defined(CYRUS_PWCHECK_SOCKET)
1258 g = string_cat(g, US" pwcheck");
1260 #if defined(RADIUS_CONFIG_FILE)
1261 g = string_cat(g, US" radius");
1263 #ifndef DISABLE_TLS_RESUME
1264 g = string_cat(g, US" TLS_resume");
1266 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1267 g = string_cat(g, US" translate_ip_address");
1269 #ifdef USE_TCP_WRAPPERS
1270 g = string_cat(g, US" TCPwrappers");
1272 #ifdef HAVE_SETCLASSRESOURCES
1273 g = string_cat(g, US" use_setclassresources");
1276 g = string_cat(g, US" DANE");
1278 #ifndef DISABLE_DKIM
1279 g = string_cat(g, US" DKIM");
1281 #ifdef SUPPORT_DMARC
1282 g = string_cat(g, US" DMARC");
1284 #ifndef DISABLE_DNSSEC
1285 g = string_cat(g, US" DNSSEC");
1287 #ifndef DISABLE_ESMTP_LIMITS
1288 g = string_cat(g, US" ESMTP_Limits");
1290 #ifndef DISABLE_WELLKNOWN
1291 g = string_cat(g, US" ESMTP_Wellknown");
1293 #ifndef DISABLE_EVENT
1294 g = string_cat(g, US" Event");
1297 g = string_cat(g, US" I18N");
1299 #ifndef DISABLE_OCSP
1300 g = string_cat(g, US" OCSP");
1302 #ifndef DISABLE_PIPE_CONNECT
1303 g = string_cat(g, US" PIPECONNECT");
1305 #ifndef DISABLE_PRDR
1306 g = string_cat(g, US" PRDR");
1308 #ifdef SUPPORT_PROXY
1309 g = string_cat(g, US" PROXY");
1311 #ifndef DISABLE_QUEUE_RAMP
1312 g = string_cat(g, US" Queue_Ramp");
1314 #ifdef SUPPORT_SOCKS
1315 g = string_cat(g, US" SOCKS");
1318 g = string_cat(g, US" SPF");
1320 #if defined(SUPPORT_SRS)
1321 g = string_cat(g, US" SRS");
1325 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1327 #ifdef EXPERIMENTAL_ARC
1328 g = string_cat(g, US" Experimental_ARC");
1330 #ifdef EXPERIMENTAL_BRIGHTMAIL
1331 g = string_cat(g, US" Experimental_Brightmail");
1333 #ifdef EXPERIMENTAL_DCC
1334 g = string_cat(g, US" Experimental_DCC");
1336 #ifdef EXPERIMENTAL_DSN_INFO
1337 g = string_cat(g, US" Experimental_DSN_info");
1339 #ifdef EXPERIMENTAL_QUEUEFILE
1340 g = string_cat(g, US" Experimental_QUEUEFILE");
1342 #ifdef EXPERIMENTAL_XCLIENT
1343 g = string_cat(g, US" Experimental_XCLIENT");
1345 g = string_cat(g, US"\n");
1347 g = lookup_show_supported(g);
1348 g = auth_show_supported(g);
1349 g = route_show_supported(g);
1350 g = transport_show_supported(g);
1352 #ifdef WITH_CONTENT_SCAN
1353 g = malware_show_supported(g);
1355 show_string(is_stdout, g); g = NULL;
1357 if (fixed_never_users[0] > 0)
1360 g = string_cat(g, US"Fixed never_users: ");
1361 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1362 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1363 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1366 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1368 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1370 /* Everything else is details which are only worth reporting when debugging.
1371 Perhaps the tls_version_report should move into this too. */
1375 /* clang defines __GNUC__ (at least, for me) so test for it first */
1376 #if defined(__clang__)
1377 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1378 #elif defined(__GNUC__)
1380 g = string_fmt_append(g, "Compiler: GCC [%s]\n", __VERSION__);
1382 g = string_fmt_append(g, "Compiler: GCC [%s]\n", "? unknown version ?";
1385 g = string_cat(g, US"Compiler: <unknown>\n");
1388 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1389 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1390 __GLIBC__, __GLIBC_MINOR__);
1391 if (__GLIBC_PREREQ(2, 1))
1392 g = string_fmt_append(g, " Runtime: %s\n",
1393 gnu_get_libc_version());
1396 g = show_db_version(g);
1399 g = tls_version_report(g);
1402 g = utf8_version_report(g);
1405 /*XXX do we need a "show misc-mods version-report" ?
1406 Currently they are output in misc_mod_add() */
1408 show_string(is_stdout, g);
1411 for (auth_info * ai = auths_available; ai; ai = (auth_info *)ai->drinfo.next)
1412 if (ai->version_report)
1413 g = (*ai->version_report)(g);
1415 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1416 characters; unless it's an ancient version of PCRE in which case it
1418 #ifndef PCRE_PRERELEASE
1419 # define PCRE_PRERELEASE
1422 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1425 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1426 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1428 PCRE2_MAJOR, PCRE2_MINOR,
1429 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1433 #undef EXPAND_AND_QUOTE
1435 show_string(is_stdout, g);
1439 tree_walk(lookups_tree, lookup_version_report_cb, &g);
1440 show_string(is_stdout, g);
1442 init_misc_mod_list();
1444 #ifdef WHITELIST_D_MACROS
1445 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1447 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1449 #ifdef TRUSTED_CONFIG_LIST
1450 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1452 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1456 show_string(is_stdout, g);
1457 store_reset(reset_point);
1461 /*************************************************
1462 * Show auxiliary information about Exim *
1463 *************************************************/
1466 show_exim_information(enum commandline_info request, FILE *stream)
1471 fprintf(stream, "Oops, something went wrong.\n");
1475 "The -bI: flag takes a string indicating which information to provide.\n"
1476 "If the string is not recognised, you'll get this help (on stderr).\n"
1478 " exim -bI:help this information\n"
1479 " exim -bI:dscp list of known dscp value keywords\n"
1480 " exim -bI:sieve list of supported sieve extensions\n"
1485 const misc_module_info * mi;
1486 typedef void (*fn_t)(FILE *);
1487 if ((mi = misc_mod_find(US"sieve_filter", NULL)))
1488 (((fn_t *) mi->functions)[SIEVE_EXTENSIONS]) (stream);
1490 fprintf(stream, "Sieve filtering not available\n");
1494 dscp_list_to_stream(stream);
1500 /*************************************************
1501 * Quote a local part *
1502 *************************************************/
1504 /* This function is used when a sender address or a From: or Sender: header
1505 line is being created from the caller's login, or from an authenticated_id. It
1506 applies appropriate quoting rules for a local part.
1508 Argument: the local part
1509 Returns: the local part, quoted if necessary
1513 local_part_quote(const uschar * lpart)
1515 BOOL needs_quote = FALSE;
1518 for (const uschar * t = lpart; !needs_quote && *t; t++)
1519 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1520 (*t != '.' || t == lpart || t[1] == 0);
1522 if (!needs_quote) return lpart;
1524 g = string_catn(NULL, US"\"", 1);
1528 uschar * nq = US Ustrpbrk(lpart, "\\\"");
1531 g = string_cat(g, lpart);
1534 g = string_catn(g, lpart, nq - lpart);
1535 g = string_catn(g, US"\\", 1);
1536 g = string_catn(g, nq, 1);
1540 g = string_catn(g, US"\"", 1);
1541 return string_from_gstring(g);
1547 /*************************************************
1548 * Load readline() functions *
1549 *************************************************/
1551 /* This function is called from testing executions that read data from stdin,
1552 but only when running as the calling user. Currently, only -be does this. The
1553 function loads the readline() function library and passes back the functions.
1554 On some systems, it needs the curses library, so load that too, but try without
1555 it if loading fails. All this functionality has to be requested at build time.
1558 fn_readline_ptr pointer to where to put the readline pointer
1559 fn_addhist_ptr pointer to where to put the addhistory function
1561 Returns: the dlopen handle or NULL on failure
1565 set_readline(char * (**fn_readline_ptr)(const char *),
1566 void (**fn_addhist_ptr)(const char *))
1569 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1571 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1572 if (dlhandle_curses) dlclose(dlhandle_curses);
1576 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1577 * char * readline (const char *prompt);
1578 * void add_history (const char *string);
1580 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1581 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1584 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1592 /*************************************************
1593 * Get a line from stdin for testing things *
1594 *************************************************/
1596 /* This function is called when running tests that can take a number of lines
1597 of input (for example, -be and -bt). It handles continuations and trailing
1598 spaces. And prompting and a blank line output on eof. If readline() is in use,
1599 the arguments are non-NULL and provide the relevant functions.
1602 fn_readline readline function or NULL
1603 fn_addhist addhist function or NULL
1605 Returns: pointer to dynamic memory, or NULL at end of file
1609 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1612 BOOL had_input = FALSE;
1614 if (!fn_readline) { printf("> "); fflush(stdout); }
1616 for (int i = 0;; i++)
1618 uschar buffer[1024];
1622 char *readline_line = NULL;
1625 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1626 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1627 p = US readline_line;
1632 /* readline() not in use */
1635 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1639 /* Handle the line */
1642 ss = p + Ustrlen(p);
1643 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1646 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1648 g = string_catn(g, p, ss - p);
1651 if (fn_readline) free(readline_line);
1654 /* g can only be NULL if ss==p */
1655 if (ss == p || gstring_last_char(g) != '\\') /* not continuation; done */
1658 gstring_trim(g, 1); /* drop the \ */
1661 if (had_input) return g ? string_from_gstring(g) : US"";
1668 /*************************************************
1669 * Output usage information for the program *
1670 *************************************************/
1672 /* This function is called when there are no recipients
1673 or a specific --help argument was added.
1676 progname information on what name we were called by
1678 Returns: DOES NOT RETURN
1682 exim_usage(const uschar * progname)
1685 /* Handle specific program invocation variants */
1686 if (Ustrcmp(progname, US"-mailq") == 0)
1688 "mailq - list the contents of the mail queue\n\n"
1689 "For a list of options, see the Exim documentation.\n");
1691 /* Generic usage - we output this whatever happens */
1693 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1694 "not directly from a shell command line. Options and/or arguments control\n"
1695 "what it does when called. For a list of options, see the Exim documentation.\n");
1700 /*************************************************
1701 * Validate that the macros given are okay *
1702 *************************************************/
1704 /* Typically, Exim will drop privileges if macros are supplied. In some
1705 cases, we want to not do so.
1707 Arguments: opt_D_used - true if the commandline had a "-D" option
1708 Returns: true if trusted, false otherwise
1712 macros_trusted(BOOL opt_D_used)
1714 #ifdef WHITELIST_D_MACROS
1715 uschar *whitelisted, *end, *p, **whites;
1716 int white_count, i, n;
1718 BOOL prev_char_item, found;
1723 #ifndef WHITELIST_D_MACROS
1727 /* We only trust -D overrides for some invoking users:
1728 root, the exim run-time user, the optional config owner user.
1729 I don't know why config-owner would be needed, but since they can own the
1730 config files anyway, there's no security risk to letting them override -D. */
1731 if ( ! ((real_uid == root_uid)
1732 || (real_uid == exim_uid)
1733 #ifdef CONFIGURE_OWNER
1734 || (real_uid == config_uid)
1738 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1742 /* Get a list of macros which are whitelisted */
1743 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1744 prev_char_item = FALSE;
1746 for (p = whitelisted; *p != '\0'; ++p)
1748 if (*p == ':' || isspace(*p))
1753 prev_char_item = FALSE;
1756 if (!prev_char_item)
1757 prev_char_item = TRUE;
1764 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1765 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1770 if (i == white_count)
1772 while (*p != '\0' && p < end)
1778 /* The list of commandline macros should be very short.
1779 Accept the N*M complexity. */
1780 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1783 for (uschar ** w = whites; *w; ++w)
1784 if (Ustrcmp(*w, m->name) == 0)
1791 if (!m->replacement)
1793 if ((len = m->replen) == 0)
1795 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1798 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1804 /*************************************************
1805 * Expansion testing *
1806 *************************************************/
1808 /* Expand and print one item, doing macro-processing.
1811 item line for expansion
1815 expansion_test_line(const uschar * line)
1821 Ustrncpy(big_buffer, line, big_buffer_size);
1822 big_buffer[big_buffer_size-1] = '\0';
1823 len = Ustrlen(big_buffer);
1825 (void) macros_expand(0, &len, &dummy_macexp);
1827 #ifdef LOOKUP_MODULE_DIR
1828 //mod_load_check(big_buffer);
1831 if (isupper(big_buffer[0]))
1833 if (macro_read_assignment(big_buffer))
1834 printf("Defined macro '%s'\n", mlast->name);
1836 else if (Ustrncmp(big_buffer, "set,t ", 6) == 0)
1837 printf("%s\n", acl_standalone_setvar(big_buffer+6, TRUE));
1838 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1839 printf("%s\n", acl_standalone_setvar(big_buffer+4, FALSE));
1841 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1842 else printf("Failed: %s\n", expand_string_message);
1847 /*************************************************
1848 * Queue-runner operations *
1849 *************************************************/
1851 /* Prefix a new qrunner descriptor to the qrunners list */
1856 qrunner * q = qrunners;
1857 qrunners = store_get(sizeof(qrunner), GET_UNTAINTED);
1858 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1860 qrunners->next_tick = time(NULL); /* run right away */
1865 alloc_onetime_qrunner(void)
1867 qrunners = store_get_perm(sizeof(qrunner), GET_UNTAINTED);
1868 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1869 qrunners->next_tick = time(NULL); /* run right away */
1870 qrunners->run_max = 1;
1875 /*************************************************
1876 * Entry point and high-level code *
1877 *************************************************/
1879 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1880 the appropriate action. All the necessary functions are present in the one
1881 binary. I originally thought one should split it up, but it turns out that so
1882 much of the apparatus is needed in each chunk that one might as well just have
1883 it all available all the time, which then makes the coding easier as well.
1886 argc count of entries in argv
1887 argv argument strings, with argv[0] being the program name
1889 Returns: EXIT_SUCCESS if terminated successfully
1890 EXIT_FAILURE otherwise, except when a message has been sent
1891 to the sender, and -oee was given
1895 main(int argc, char ** cargv)
1897 const uschar ** argv = CUSS cargv;
1898 int arg_receive_timeout = -1;
1899 int arg_smtp_receive_timeout = -1;
1900 int arg_error_handling = error_handling;
1901 int filter_sfd = -1;
1902 int filter_ufd = -1;
1905 int list_queue_option = QL_BASIC;
1907 int msg_action_arg = -1;
1908 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1909 int queue_only_reason = 0;
1911 int perl_start_option = 0;
1913 int recipients_arg = argc;
1914 int sender_address_domain = 0;
1915 int test_retry_arg = -1;
1916 int test_rewrite_arg = -1;
1917 gid_t original_egid;
1918 BOOL arg_queue_only = FALSE;
1919 BOOL bi_option = FALSE;
1920 BOOL checking = FALSE;
1921 BOOL count_queue = FALSE;
1922 BOOL expansion_test = FALSE;
1923 BOOL extract_recipients = FALSE;
1924 BOOL flag_G = FALSE;
1925 BOOL flag_n = FALSE;
1926 BOOL forced_delivery = FALSE;
1927 BOOL f_end_dot = FALSE;
1928 BOOL deliver_give_up = FALSE;
1929 BOOL list_queue = FALSE;
1930 BOOL list_options = FALSE;
1931 BOOL list_config = FALSE;
1932 BOOL local_queue_only;
1933 BOOL one_msg_action = FALSE;
1934 BOOL opt_D_used = FALSE;
1935 BOOL queue_only_set = FALSE;
1936 BOOL receiving_message = TRUE;
1937 BOOL sender_ident_set = FALSE;
1938 BOOL session_local_queue_only;
1940 BOOL removed_privilege = FALSE;
1941 BOOL usage_wanted = FALSE;
1942 BOOL verify_address_mode = FALSE;
1943 BOOL verify_as_sender = FALSE;
1944 BOOL rcpt_verify_quota = FALSE;
1945 BOOL version_printed = FALSE;
1946 const uschar * alias_arg = NULL;
1947 const uschar * called_as = US"";
1948 const uschar * cmdline_syslog_name = NULL;
1949 const uschar * start_queue_run_id = NULL;
1950 const uschar * stop_queue_run_id = NULL;
1951 const uschar * expansion_test_message = NULL;
1952 const uschar * ftest_domain = NULL;
1953 const uschar * ftest_localpart = NULL;
1954 const uschar * ftest_prefix = NULL;
1955 const uschar * ftest_suffix = NULL;
1956 uschar * log_oneline = NULL;
1957 const uschar * malware_test_file = NULL;
1958 const uschar * real_sender_address;
1959 uschar * originator_home = US"/";
1963 struct stat statbuf;
1964 pid_t passed_qr_pid = (pid_t)0;
1965 int passed_qr_pipe = -1;
1966 gid_t group_list[EXIM_GROUPLIST_SIZE];
1968 /* For the -bI: flag */
1969 enum commandline_info info_flag = CMDINFO_NONE;
1970 BOOL info_stdout = FALSE;
1972 /* Possible options for -R and -S */
1974 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1976 /* Need to define this in case we need to change the environment in order
1977 to get rid of a bogus time zone. We have to make it char rather than uschar
1978 because some OS define it in /usr/include/unistd.h. */
1980 extern char **environ;
1982 #ifdef MEASURE_TIMING
1983 (void)gettimeofday(×tamp_startup, NULL);
1986 store_init(); /* Initialise the memory allocation susbsystem */
1987 pcre_init(); /* Set up memory handling for pcre */
1989 /* If the Exim user and/or group and/or the configuration file owner/group were
1990 defined by ref:name at build time, we must now find the actual uid/gid values.
1991 This is a feature to make the lives of binary distributors easier. */
1993 #ifdef EXIM_USERNAME
1994 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1997 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1999 /* If ref:name uses a number as the name, route_finduser() returns
2000 TRUE with exim_uid set and pw coerced to NULL. */
2002 exim_gid = pw->pw_gid;
2003 #ifndef EXIM_GROUPNAME
2006 "exim: ref:name should specify a usercode, not a group.\n"
2007 "exim: can't let you get away with it unless you also specify a group.\n");
2011 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
2014 #ifdef EXIM_GROUPNAME
2015 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
2016 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
2019 #ifdef CONFIGURE_OWNERNAME
2020 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
2021 exim_fail("exim: failed to find uid for user name \"%s\"\n",
2022 CONFIGURE_OWNERNAME);
2025 /* We default the system_filter_user to be the Exim run-time user, as a
2026 sane non-root value. */
2027 system_filter_uid = exim_uid;
2029 #ifdef CONFIGURE_GROUPNAME
2030 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
2031 exim_fail("exim: failed to find gid for group name \"%s\"\n",
2032 CONFIGURE_GROUPNAME);
2035 /* In the Cygwin environment, some initialization used to need doing.
2036 It was fudged in by means of this macro; now no longer but we'll leave
2037 it in case of others. */
2043 /* Check a field which is patched when we are running Exim within its
2044 testing harness; do a fast initial check, and then the whole thing. */
2046 f.running_in_test_harness =
2047 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
2048 if (f.running_in_test_harness)
2051 /* Protect against abusive argv[0] */
2052 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
2053 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
2055 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
2056 at the start of a program; however, it seems that some environments do not
2057 follow this. A "strange" locale can affect the formatting of timestamps, so we
2060 setlocale(LC_ALL, "C");
2062 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
2064 #ifdef _POSIX_MONOTONIC_CLOCK
2068 /* Set up the default handler for timing using alarm(). */
2070 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2072 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
2073 because store_malloc writes a log entry on failure. */
2075 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
2076 exim_fail("exim: failed to get store for log buffer\n");
2078 /* Initialize the default log options. */
2080 bits_set(log_selector, log_selector_size, log_default);
2082 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
2083 NULL when the daemon is run and the file is closed. We have to use this
2084 indirection, because some systems don't allow writing to the variable "stderr".
2087 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
2089 /* Ensure there is a big buffer for temporary use in several places. It is put
2090 in malloc store so that it can be freed for enlargement if necessary. */
2092 big_buffer = store_malloc(big_buffer_size);
2094 /* Set up the handler for the data request signal, and set the initial
2095 descriptive text. */
2097 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
2098 set_process_info("initializing");
2099 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
2102 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
2103 sigaction(SIGSEGV, &act, NULL);
2106 signal(SIGSEGV, segv_handler); /* log faults */
2109 /* If running in a dockerized environment, the TERM signal is only
2110 delegated to the PID 1 if we request it by setting an signal handler */
2112 if (getpid() == 1) signal(SIGTERM, term_handler);
2114 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
2115 in the daemon code. For the rest of Exim's uses, we ignore it. */
2117 signal(SIGHUP, SIG_IGN);
2119 /* We don't want to die on pipe errors as the code is written to handle
2120 the write error instead. */
2122 signal(SIGPIPE, SIG_IGN);
2124 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
2125 set to SIG_IGN. This causes subprocesses that complete before the parent
2126 process waits for them not to hang around, so when Exim calls wait(), nothing
2127 is there. The wait() code has been made robust against this, but let's ensure
2128 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
2129 ending status. We use sigaction rather than plain signal() on those OS where
2130 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
2131 problem on AIX with this.) */
2135 struct sigaction act;
2136 act.sa_handler = SIG_DFL;
2137 sigemptyset(&(act.sa_mask));
2139 sigaction(SIGCHLD, &act, NULL);
2142 signal(SIGCHLD, SIG_DFL);
2145 /* Save the arguments for use if we re-exec exim as a daemon after receiving
2150 /* Set up the version number. Set up the leading 'E' for the external form of
2151 message ids, set the pointer to the internal form, and initialize it to
2152 indicate no message being processed. */
2155 message_id_option[0] = '-';
2156 message_id_external = message_id_option + 1;
2157 message_id_external[0] = 'E';
2158 message_id = message_id_external + 1;
2161 /* Set the umask to zero so that any files Exim creates using open() are
2162 created with the modes that it specifies. NOTE: Files created with fopen() have
2163 a problem, which was not recognized till rather late (February 2006). With this
2164 umask, such files will be world writeable. (They are all content scanning files
2165 in the spool directory, which isn't world-accessible, so this is not a
2166 disaster, but it's untidy.) I don't want to change this overall setting,
2167 however, because it will interact badly with the open() calls. Instead, there's
2168 now a function called modefopen() that fiddles with the umask while calling
2173 /* Precompile the regular expression for matching a message id. Keep this in
2174 step with the code that generates ids in the accept.c module. We need to do
2175 this here, because the -M options check their arguments for syntactic validity
2176 using mac_ismsgid, which uses this. */
2179 regex_must_compile(US"^(?:"
2180 "[^\\W_]{" str(MESSAGE_ID_TIME_LEN) "}"
2181 "-[^\\W_]{" str(MESSAGE_ID_PID_LEN) "}"
2182 "-[^\\W_]{" str(MESSAGE_ID_SUBTIME_LEN) "}"
2184 "(?:[^\\W_]{6}-){2}[^\\W_]{2}" /* old ID format */
2188 /* Precompile the regular expression that is used for matching an SMTP error
2189 code, possibly extended, at the start of an error message. Note that the
2190 terminating whitespace character is included. */
2193 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2196 #ifdef WHITELIST_D_MACROS
2197 /* Precompile the regular expression used to filter the content of macros
2198 given to -D for permissibility. */
2200 regex_whitelisted_macro =
2201 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2204 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2205 this seems to be a generally accepted convention, since one finds symbolic
2206 links called "mailq" in standard OS configurations. */
2208 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2209 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2212 receiving_message = FALSE;
2213 called_as = US"-mailq";
2216 /* If the program is called as "rmail" treat it as equivalent to
2217 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2218 i.e. preventing a single dot on a line from terminating the message, and
2219 returning with zero return code, even in cases of error (provided an error
2220 message has been sent). */
2222 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2223 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2226 called_as = US"-rmail";
2227 errors_sender_rc = EXIT_SUCCESS;
2230 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2231 this is a smail convention. */
2233 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2234 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2236 smtp_input = smtp_batched_input = TRUE;
2237 called_as = US"-rsmtp";
2240 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2241 this is a smail convention. */
2243 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2244 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2246 alloc_onetime_qrunner();
2247 receiving_message = FALSE;
2248 called_as = US"-runq";
2251 /* If the program is called as "newaliases" treat it as equivalent to
2252 "exim -bi"; this is a sendmail convention. */
2254 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2255 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2258 receiving_message = FALSE;
2259 called_as = US"-newaliases";
2262 /* Save the original effective uid for a couple of uses later. It should
2263 normally be root, but in some esoteric environments it may not be. */
2265 original_euid = geteuid();
2266 original_egid = getegid();
2268 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2269 to be the same as the real ones. This makes a difference only if Exim is setuid
2270 (or setgid) to something other than root, which could be the case in some
2271 special configurations. */
2273 real_uid = getuid();
2274 real_gid = getgid();
2276 if (real_uid == root_uid)
2278 if ((rv = setgid(real_gid)))
2279 exim_fail("exim: setgid(%ld) failed: %s\n",
2280 (long int)real_gid, strerror(errno));
2281 if ((rv = setuid(real_uid)))
2282 exim_fail("exim: setuid(%ld) failed: %s\n",
2283 (long int)real_uid, strerror(errno));
2286 /* If neither the original real uid nor the original euid was root, Exim is
2287 running in an unprivileged state. */
2289 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2291 /* For most of the args-parsing we need to use permanent pool memory */
2293 int old_pool = store_pool;
2294 store_pool = POOL_PERM;
2296 /* Scan the program's arguments. Some can be dealt with right away; others are
2297 simply recorded for checking and handling afterwards. Do a high-level switch
2298 on the second character (the one after '-'), to save some effort. */
2300 for (i = 1; i < argc; i++)
2302 BOOL badarg = FALSE;
2303 const uschar * arg = argv[i];
2304 const uschar * argrest;
2307 /* An argument not starting with '-' is the start of a recipients list;
2308 break out of the options-scanning loop. */
2316 /* An option consisting of -- terminates the options */
2318 if (Ustrcmp(arg, "--") == 0)
2320 recipients_arg = i + 1;
2324 /* Handle flagged options */
2326 switchchar = arg[1];
2329 /* Make all -ex options synonymous with -oex arguments, since that
2330 is assumed by various callers. Also make -qR options synonymous with -R
2331 options, as that seems to be required as well. Allow for -qqR too, and
2332 the same for -S options. */
2334 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2335 Ustrncmp(arg+1, "qR", 2) == 0 ||
2336 Ustrncmp(arg+1, "qS", 2) == 0)
2338 switchchar = arg[2];
2341 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2343 switchchar = arg[3];
2345 f.queue_2stage = TRUE;
2348 /* Make -r synonymous with -f, since it is a documented alias */
2350 else if (arg[1] == 'r') switchchar = 'f';
2352 /* Make -ov synonymous with -v */
2354 else if (Ustrcmp(arg, "-ov") == 0)
2360 /* deal with --option_aliases */
2361 else if (switchchar == '-')
2363 if (Ustrcmp(argrest, "help") == 0)
2365 usage_wanted = TRUE;
2368 else if (Ustrcmp(argrest, "version") == 0)
2375 /* High-level switch on active initial letter */
2380 /* sendmail uses -Ac and -Am to control which .cf file is used;
2383 if (!*argrest) { badarg = TRUE; break; }
2386 BOOL ignore = FALSE;
2391 if (*(argrest + 1) == '\0')
2395 if (!ignore) badarg = TRUE;
2399 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2400 so has no need of it. */
2403 if (!*argrest) i++; /* Skip over the type */
2409 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2413 /* -bd: Run in daemon mode, awaiting SMTP connections.
2414 -bdf: Ditto, but in the foreground.
2417 f.daemon_listen = f.daemon_scion = TRUE;
2418 if (*argrest == 'f') f.background_daemon = FALSE;
2419 else if (*argrest) badarg = TRUE;
2422 /* -be: Run in expansion test mode
2423 -bem: Ditto, but read a message from a file first
2426 expansion_test = checking = TRUE;
2427 if (*argrest == 'm')
2429 if (++i >= argc) { badarg = TRUE; break; }
2430 expansion_test_message = argv[i];
2433 if (*argrest) badarg = TRUE;
2436 /* -bF: Run system filter test */
2438 filter_test |= checking = FTEST_SYSTEM;
2439 if (*argrest) badarg = TRUE;
2440 else if (++i < argc) filter_test_sfile = argv[i];
2441 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2444 /* -bf: Run user filter test
2445 -bfd: Set domain for filter testing
2446 -bfl: Set local part for filter testing
2447 -bfp: Set prefix for filter testing
2448 -bfs: Set suffix for filter testing
2453 filter_test |= checking = FTEST_USER;
2454 if (++i < argc) filter_test_ufile = argv[i];
2455 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2460 exim_fail("exim: string expected after %s\n", arg);
2461 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2462 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2463 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2464 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2469 /* -bh: Host checking - an IP address must follow. */
2471 if ( (!*argrest || Ustrcmp(argrest, "c") == 0)
2474 sender_host_address = string_copy_taint(
2475 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2477 host_checking = checking = f.log_testing_mode = TRUE;
2478 f.host_checking_callout = *argrest == 'c';
2479 message_logs = FALSE;
2485 /* -bi: This option is used by sendmail to initialize *the* alias file,
2486 though it has the -oA option to specify a different file. Exim has no
2487 concept of *the* alias file, but since Sun's YP make script calls
2488 sendmail this way, some support must be provided. */
2490 if (!*argrest) bi_option = TRUE;
2494 /* -bI: provide information, of the type to follow after a colon.
2495 This is an Exim flag. */
2497 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2499 const uschar * p = argrest+1;
2500 info_flag = CMDINFO_HELP;
2502 if (strcmpic(p, CUS"sieve") == 0)
2504 info_flag = CMDINFO_SIEVE;
2507 else if (strcmpic(p, CUS"dscp") == 0)
2509 info_flag = CMDINFO_DSCP;
2512 else if (strcmpic(p, CUS"help") == 0)
2518 /* -bm: Accept and deliver message - the default option. Reinstate
2519 receiving_message, which got turned off for all -b options.
2520 -bmalware: test the filename given for malware */
2522 if (!*argrest) receiving_message = TRUE;
2523 else if (Ustrcmp(argrest, "alware") == 0)
2525 if (++i >= argc) { badarg = TRUE; break; }
2527 malware_test_file = argv[i];
2532 /* -bnq: For locally originating messages, do not qualify unqualified
2533 addresses. In the envelope, this causes errors; in header lines they
2536 if (Ustrcmp(argrest, "q") == 0)
2538 f.allow_unqualified_sender = FALSE;
2539 f.allow_unqualified_recipient = FALSE;
2544 /* -bpxx: List the contents of the mail queue, in various forms. If
2545 the option is -bpc, just a queue count is needed. Otherwise, if the
2546 first letter after p is r, then order is random. */
2548 if (*argrest == 'c')
2551 if (*++argrest) badarg = TRUE;
2555 if (*argrest == 'r')
2556 list_queue_option = QL_UNSORTED, argrest++;
2558 list_queue_option = QL_BASIC;
2562 /* -bp: List the contents of the mail queue, top-level only */
2566 /* -bpu: List the contents of the mail queue, top-level undelivered */
2568 else if (Ustrcmp(argrest, "u") == 0) list_queue_option |= QL_UNDELIVERED_ONLY;
2570 /* -bpa: List the contents of the mail queue, including all delivered */
2572 else if (Ustrcmp(argrest, "a") == 0) list_queue_option |= QL_PLUS_GENERATED;
2574 /* -bpi: List only message IDs */
2576 else if (Ustrcmp(argrest, "i") == 0) list_queue_option |= QL_MSGID_ONLY;
2578 /* Unknown after -bp[r] */
2584 /* -bP: List the configuration variables given as the address list.
2585 Force -v, so configuration errors get displayed. */
2588 /* -bP config: we need to setup here, because later,
2589 when list_options is checked, the config is read already */
2592 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2595 readconf_save_config(version_string);
2599 list_options = TRUE;
2600 debug_selector |= D_v;
2601 debug_file = stderr;
2605 /* -brt: Test retry configuration lookup */
2607 if (Ustrcmp(argrest, "t") == 0)
2610 test_retry_arg = i + 1;
2614 /* -brw: Test rewrite configuration */
2616 else if (Ustrcmp(argrest, "w") == 0)
2619 test_rewrite_arg = i + 1;
2625 /* -bS: Read SMTP commands on standard input, but produce no replies -
2626 all errors are reported by sending messages. */
2629 smtp_input = smtp_batched_input = receiving_message = TRUE;
2633 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2634 on standard output. */
2636 if (!*argrest) smtp_input = receiving_message = TRUE;
2640 /* -bt: address testing mode */
2643 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2647 /* -bv: verify addresses */
2650 verify_address_mode = checking = f.log_testing_mode = TRUE;
2652 /* -bvs: verify sender addresses */
2654 else if (Ustrcmp(argrest, "s") == 0)
2656 verify_address_mode = checking = f.log_testing_mode = TRUE;
2657 verify_as_sender = TRUE;
2662 /* -bV: Print version string and support details */
2666 printf("Exim version %s #%s built %s\n", version_string,
2667 version_cnumber, version_date);
2668 printf("%s\n", CS version_copyright);
2669 version_printed = TRUE;
2670 show_whats_supported(TRUE);
2671 f.log_testing_mode = TRUE;
2676 /* -bw: inetd wait mode, accept a listening socket as stdin */
2678 f.inetd_wait_mode = TRUE;
2679 f.background_daemon = FALSE;
2680 f.daemon_listen = f.daemon_scion = TRUE;
2682 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2683 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2694 /* -C: change configuration file list; ignore if it isn't really
2695 a change! Enforce a prefix check if required. */
2699 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2700 if (Ustrcmp(config_main_filelist, argrest) != 0)
2702 #ifdef ALT_CONFIG_PREFIX
2704 int len = Ustrlen(ALT_CONFIG_PREFIX);
2705 const uschar *list = argrest;
2707 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2708 while((filename = string_nextinlist(&list, &sep, big_buffer,
2710 if ( ( Ustrlen(filename) < len
2711 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2712 || Ustrstr(filename, "/../") != NULL
2714 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2716 exim_fail("-C Permission denied\n");
2718 if (real_uid != root_uid)
2720 #ifdef TRUSTED_CONFIG_LIST
2722 if (real_uid != exim_uid
2723 #ifdef CONFIGURE_OWNER
2724 && real_uid != config_uid
2727 f.trusted_config = FALSE;
2730 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2733 struct stat statbuf;
2735 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2736 (statbuf.st_uid != root_uid /* owner not root */
2737 #ifdef CONFIGURE_OWNER
2738 && statbuf.st_uid != config_uid /* owner not the special one */
2741 (statbuf.st_gid != root_gid /* group not root */
2742 #ifdef CONFIGURE_GROUP
2743 && statbuf.st_gid != config_gid /* group not the special one */
2745 && (statbuf.st_mode & 020) != 0 /* group writeable */
2747 (statbuf.st_mode & 2) != 0) /* world writeable */
2749 f.trusted_config = FALSE;
2754 /* Well, the trust list at least is up to scratch... */
2756 uschar *trusted_configs[32];
2759 int old_pool = store_pool;
2760 store_pool = POOL_MAIN;
2762 reset_point = store_mark();
2763 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2765 uschar * start = big_buffer, * nl;
2766 if (Uskip_whitespace(&start) != '/')
2768 if ((nl = Ustrchr(start, '\n')))
2770 trusted_configs[nr_configs++] = string_copy(start);
2771 if (nr_configs == nelem(trusted_configs))
2779 const uschar *list = argrest;
2781 while (f.trusted_config && (filename = string_nextinlist(&list,
2782 &sep, big_buffer, big_buffer_size)))
2784 for (i=0; i < nr_configs; i++)
2785 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2787 if (i == nr_configs)
2789 f.trusted_config = FALSE;
2794 else /* No valid prefixes found in trust_list file. */
2795 f.trusted_config = FALSE;
2796 store_reset(reset_point);
2797 store_pool = old_pool;
2800 else /* Could not open trust_list file. */
2801 f.trusted_config = FALSE;
2804 /* Not root; don't trust config */
2805 f.trusted_config = FALSE;
2809 config_main_filelist = argrest;
2810 f.config_changed = TRUE;
2815 /* -D: set up a macro definition */
2818 #ifdef DISABLE_D_OPTION
2819 exim_fail("exim: -D is not available in this Exim binary\n");
2825 const uschar * s = argrest;
2828 Uskip_whitespace(&s);
2830 if (*s < 'A' || *s > 'Z')
2831 exim_fail("exim: macro name set by -D must start with "
2832 "an upper case letter\n");
2834 while (isalnum(*s) || *s == '_')
2836 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2840 if (ptr == 0) { badarg = TRUE; break; }
2841 if (Uskip_whitespace(&s))
2843 if (*s++ != '=') { badarg = TRUE; break; }
2844 Uskip_whitespace(&s);
2847 for (m = macros_user; m; m = m->next)
2848 if (Ustrcmp(m->name, name) == 0)
2849 exim_fail("exim: duplicated -D in command line\n");
2851 m = macro_create(name, s, TRUE);
2853 if (clmacro_count >= MAX_CLMACROS)
2854 exim_fail("exim: too many -D options on command line\n");
2855 clmacros[clmacro_count++] =
2856 string_sprintf("-D%s=%s", m->name, m->replacement);
2863 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2865 if (Ustrcmp(argrest, "ropcr") == 0)
2867 /* drop_cr = TRUE; */
2870 /* -dp: Set up a debug pretrigger buffer with given size. */
2872 else if (Ustrcmp(argrest, "p") == 0)
2876 debug_pretrigger_setup(argv[i]);
2878 /* -dt: Set a debug trigger selector */
2880 else if (Ustrncmp(argrest, "t=", 2) == 0)
2881 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2883 /* -d: Set debug level (see also -v below).
2884 If -dd is used, debugging subprocesses of the daemon is disabled. */
2888 /* Use an intermediate variable so that we don't set debugging while
2889 decoding the debugging bits. */
2891 unsigned int selector = D_default;
2894 if (*argrest == 'd')
2896 f.debug_daemon = TRUE;
2900 decode_bits(&selector, 1, debug_notall, argrest,
2901 debug_options, debug_options_count, US"debug", 0);
2902 debug_selector = selector;
2907 /* -E: This is a local error message. This option is not intended for
2908 external use at all, but is not restricted to trusted callers because it
2909 does no harm (just suppresses certain error messages) and if Exim is run
2910 not setuid root it won't always be trusted when it generates error
2911 messages using this option. If there is a message id following -E, point
2912 message_reference at it, for logging. */
2915 f.local_error_message = TRUE;
2916 if (mac_ismsgid(argrest)) message_reference = argrest;
2920 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2921 option, so it looks as if historically the -oex options are also callable
2922 without the leading -o. So we have to accept them. Before the switch,
2923 anything starting -oe has been converted to -e. Exim does not support all
2924 of the sendmail error options. */
2927 if (Ustrcmp(argrest, "e") == 0)
2929 arg_error_handling = ERRORS_SENDER;
2930 errors_sender_rc = EXIT_SUCCESS;
2932 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2933 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2934 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2935 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2940 /* -F: Set sender's full name, used instead of the gecos entry from
2941 the password file. Since users can usually alter their gecos entries,
2942 there's no security involved in using this instead. The data can follow
2943 the -F or be in the next argument. */
2947 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2948 originator_name = string_copy_taint(
2949 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2951 f.sender_name_forced = TRUE;
2955 /* -f: Set sender's address - this value is only actually used if Exim is
2956 run by a trusted user, or if untrusted_set_sender is set and matches the
2957 address, except that the null address can always be set by any user. The
2958 test for this happens later, when the value given here is ignored when not
2959 permitted. For an untrusted user, the actual sender is still put in Sender:
2960 if it doesn't match the From: header (unless no_local_from_check is set).
2961 The data can follow the -f or be in the next argument. The -r switch is an
2962 obsolete form of -f but since there appear to be programs out there that
2963 use anything that sendmail has ever supported, better accept it - the
2964 synonymizing is done before the switch above.
2966 At this stage, we must allow domain literal addresses, because we don't
2967 know what the setting of allow_domain_literals is yet. Ditto for trailing
2968 dots and strip_trailing_dot. */
2972 int dummy_start, dummy_end;
2975 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2976 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2979 uschar * s = store_get(1, GET_UNTAINTED); /* Ensure writeable memory */
2985 const uschar * temp = argrest + Ustrlen(argrest) - 1;
2986 while (temp >= argrest && isspace(*temp)) temp--;
2987 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2988 allow_domain_literals = TRUE;
2989 strip_trailing_dot = TRUE;
2991 allow_utf8_domains = TRUE;
2993 if (!(sender_address = parse_extract_address(argrest, &errmess,
2994 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2995 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2997 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2999 message_smtputf8 = string_is_utf8(sender_address);
3000 allow_utf8_domains = FALSE;
3002 allow_domain_literals = FALSE;
3003 strip_trailing_dot = FALSE;
3005 f.sender_address_forced = TRUE;
3009 /* -G: sendmail invocation to specify that it's a gateway submission and
3010 sendmail may complain about problems instead of fixing them.
3011 We make it equivalent to an ACL "control = suppress_local_fixups" and do
3012 not at this time complain about problems. */
3018 /* -h: Set the hop count for an incoming message. Exim does not currently
3019 support this; it always computes it by counting the Received: headers.
3020 To put it in will require a change to the spool header file format. */
3024 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3025 if (!isdigit(*argrest)) badarg = TRUE;
3029 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
3030 not to be documented for sendmail but mailx (at least) uses it) */
3033 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
3037 /* -L: set the identifier used for syslog; equivalent to setting
3038 syslog_processname in the config file, but needs to be an admin option. */
3042 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3043 if ((sz = Ustrlen(argrest)) > 32)
3044 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
3046 exim_fail("exim: the -L syslog name is too short\n");
3047 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
3051 receiving_message = FALSE;
3053 /* -MC: continue delivery of another message via an existing open
3054 file descriptor. This option is used for an internal call by the
3055 smtp transport when there is a pending message waiting to go to an
3056 address to which it has got a connection. Five subsequent arguments are
3057 required: transport name, host name, IP address, sequence number, and
3058 message_id. Transports may decline to create new processes if the sequence
3059 number gets too big. The channel is stdin. This (-MC) must be the last
3060 argument. There's a subsequent check that the real-uid is privileged.
3062 If we are running in the test harness. delay for a bit, to let the process
3063 that set this one up complete. This makes for repeatability of the logging,
3066 if (Ustrcmp(argrest, "C") == 0)
3068 union sockaddr_46 interface_sock;
3069 EXIM_SOCKLEN_T size = sizeof(interface_sock);
3072 exim_fail("exim: too many or too few arguments after -MC\n");
3074 if (msg_action_arg >= 0)
3075 exim_fail("exim: incompatible arguments\n");
3077 continue_transport = string_copy_taint(
3078 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
3080 continue_hostname = string_copy_taint(
3081 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
3083 continue_host_address = string_copy_taint(
3084 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
3086 continue_sequence = Uatoi(argv[++i]);
3087 msg_action = MSG_DELIVER;
3088 msg_action_arg = ++i;
3089 forced_delivery = TRUE;
3090 queue_run_pid = passed_qr_pid;
3091 queue_run_pipe = passed_qr_pipe;
3093 if (!mac_ismsgid(argv[i]))
3094 exim_fail("exim: malformed message id %s after -MC option\n",
3097 /* Set up $sending_ip_address and $sending_port, unless proxied */
3099 if (!continue_proxy_cipher)
3100 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
3102 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
3105 exim_fail("exim: getsockname() failed after -MC option: %s\n",
3108 testharness_pause_ms(500);
3112 else if (*argrest == 'C' && argrest[1] && !argrest[2])
3116 /* -MCA: set the smtp_authenticated flag; this is useful only when it
3117 precedes -MC (see above). The flag indicates that the host to which
3118 Exim is connected has accepted an AUTH sequence. */
3120 case 'A': f.smtp_authenticated = TRUE; break;
3122 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
3123 that exim is connected to supports the esmtp extension DSN */
3125 case 'D': smtp_peer_options |= OPTION_DSN; break;
3127 /* -MCd: for debug, set a process-purpose string */
3129 case 'd': if (++i < argc)
3130 process_purpose = string_copy_taint(
3131 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
3136 /* -MCG: set the queue name, to a non-default value. Arguably, anything
3137 from the commandline should be tainted - but we will need an untainted
3138 value for the spoolfile when doing a -odi delivery process. */
3140 case 'G': if (++i < argc) queue_name = string_copy_taint(
3141 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
3146 /* -MCK: the peer offered CHUNKING. Must precede -MC */
3148 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
3150 #ifndef DISABLE_ESMTP_LIMITS
3151 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
3152 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
3154 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
3156 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
3161 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
3162 it preceded -MC (see above) */
3164 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3166 #ifdef SUPPORT_SOCKS
3167 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3168 case 'p': proxy_session = TRUE;
3171 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3174 proxy_local_port = Uatoi(argv[i]);
3177 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3180 proxy_external_port = Uatoi(argv[i]);
3186 /* -MCQ: pass on the pid of the queue-running process that started
3187 this chain of deliveries and the fd of its synchronizing pipe; this
3188 is useful only when it precedes -MC (see above) */
3190 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3192 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3196 /* -MCq: do a quota check on the given recipient for the given size
3197 of message. Separate from -MC. */
3198 case 'q': rcpt_verify_quota = TRUE;
3199 if (++i < argc) message_size = Uatoi(argv[i]);
3203 /* -MCS: set the smtp_use_size flag; this is useful only when it
3204 precedes -MC (see above) */
3206 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3209 /* -MCs: used with -MCt; SNI was sent */
3210 /* -MCr: ditto, DANE */
3213 case 's': if (++i < argc)
3215 continue_proxy_sni = string_copy_taint(
3216 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3218 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3223 /* -MCt: similar to -MCT below but the connection is still open
3224 via a proxy process which handles the TLS context and coding.
3225 Require three arguments for the proxied local address and port,
3226 and the TLS cipher. */
3228 case 't': if (++i < argc)
3229 sending_ip_address = string_copy_taint(
3230 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3234 sending_port = (int)(Uatol(argv[i]));
3237 continue_proxy_cipher = string_copy_taint(
3238 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3243 /* -MCT: set the tls_offered flag; this is useful only when it
3244 precedes -MC (see above). The flag indicates that the host to which
3245 Exim is connected has offered TLS support. */
3247 case 'T': smtp_peer_options |= OPTION_TLS; break;
3250 default: badarg = TRUE; break;
3255 /* -M[x]: various operations on the following list of message ids:
3256 -M deliver the messages, ignoring next retry times and thawing
3257 -Mc deliver the messages, checking next retry times, no thawing
3258 -Mf freeze the messages
3259 -Mg give up on the messages
3260 -Mt thaw the messages
3261 -Mrm remove the messages
3262 In the above cases, this must be the last option. There are also the
3263 following options which are followed by a single message id, and which
3264 act on that message. Some of them use the "recipient" addresses as well.
3265 -Mar add recipient(s)
3266 -MG move to a different queue
3267 -Mmad mark all recipients delivered
3268 -Mmd mark recipients(s) delivered
3270 -Mset load a message for use with -be
3272 -Mvc show copy (of whole message, in RFC 2822 format)
3279 msg_action = MSG_DELIVER;
3280 forced_delivery = f.deliver_force_thaw = TRUE;
3282 else if (Ustrcmp(argrest, "ar") == 0)
3284 msg_action = MSG_ADD_RECIPIENT;
3285 one_msg_action = TRUE;
3287 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3288 else if (Ustrcmp(argrest, "es") == 0)
3290 msg_action = MSG_EDIT_SENDER;
3291 one_msg_action = TRUE;
3293 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3294 else if (Ustrcmp(argrest, "g") == 0)
3296 msg_action = MSG_DELIVER;
3297 deliver_give_up = TRUE;
3299 else if (Ustrcmp(argrest, "G") == 0)
3301 msg_action = MSG_SETQUEUE;
3302 queue_name_dest = string_copy_taint(
3303 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3304 EXIM_DRIVERNAME_MAX, "-MG"),
3307 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3308 else if (Ustrcmp(argrest, "md") == 0)
3310 msg_action = MSG_MARK_DELIVERED;
3311 one_msg_action = TRUE;
3313 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3314 else if (Ustrcmp(argrest, "set") == 0)
3316 msg_action = MSG_LOAD;
3317 one_msg_action = TRUE;
3319 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3320 else if (Ustrcmp(argrest, "vb") == 0)
3322 msg_action = MSG_SHOW_BODY;
3323 one_msg_action = TRUE;
3325 else if (Ustrcmp(argrest, "vc") == 0)
3327 msg_action = MSG_SHOW_COPY;
3328 one_msg_action = TRUE;
3330 else if (Ustrcmp(argrest, "vh") == 0)
3332 msg_action = MSG_SHOW_HEADER;
3333 one_msg_action = TRUE;
3335 else if (Ustrcmp(argrest, "vl") == 0)
3337 msg_action = MSG_SHOW_LOG;
3338 one_msg_action = TRUE;
3340 else { badarg = TRUE; break; }
3342 /* All the -Mxx options require at least one message id. */
3344 msg_action_arg = i + 1;
3345 if (msg_action_arg >= argc)
3346 exim_fail("exim: no message ids given after %s option\n", arg);
3348 /* Some require only message ids to follow */
3350 if (!one_msg_action)
3352 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3353 exim_fail("exim: malformed message id %s after %s option\n",
3355 goto END_ARG; /* Remaining args are ids */
3358 /* Others require only one message id, possibly followed by addresses,
3359 which will be handled as normal arguments. */
3363 if (!mac_ismsgid(argv[msg_action_arg]))
3364 exim_fail("exim: malformed message id %s after %s option\n",
3365 argv[msg_action_arg], arg);
3371 /* Some programs seem to call the -om option without the leading o;
3372 for sendmail it askes for "me too". Exim always does this. */
3375 if (*argrest) badarg = TRUE;
3379 /* -N: don't do delivery - a debugging option that stops transports doing
3380 their thing. It implies debugging at the D_v level. */
3385 f.dont_deliver = TRUE;
3386 debug_selector |= D_v;
3387 debug_file = stderr;
3393 /* -n: This means "don't alias" in sendmail, apparently.
3394 For normal invocations, it has no effect.
3395 It may affect some other options. */
3401 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3402 option to the specified value. This form uses long names. We need to handle
3403 -O option=value and -Ooption=value. */
3408 exim_fail("exim: string expected after -O\n");
3414 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3417 if (!*(alias_arg = argrest))
3418 if (i+1 < argc) alias_arg = argv[++i];
3419 else exim_fail("exim: string expected after -oA\n");
3422 /* -oB: Set a connection message max value for remote deliveries */
3425 const uschar * p = argrest;
3427 if (i+1 < argc && isdigit((argv[i+1][0])))
3431 connection_max_messages = 1;
3438 exim_fail("exim: number expected after -oB\n");
3439 connection_max_messages = Uatoi(p);
3444 /* -odb: background delivery */
3447 if (Ustrcmp(argrest, "b") == 0)
3449 f.synchronous_delivery = FALSE;
3450 arg_queue_only = FALSE;
3451 queue_only_set = TRUE;
3454 /* -odd: testsuite-only: add no inter-process delays */
3456 else if (Ustrcmp(argrest, "d") == 0)
3457 f.testsuite_delays = FALSE;
3459 /* -odf: foreground delivery (smail-compatible option); same effect as
3460 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3463 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3465 f.synchronous_delivery = TRUE;
3466 arg_queue_only = FALSE;
3467 queue_only_set = TRUE;
3470 /* -odq: queue only */
3472 else if (Ustrcmp(argrest, "q") == 0)
3474 f.synchronous_delivery = FALSE;
3475 arg_queue_only = TRUE;
3476 queue_only_set = TRUE;
3479 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3480 but no remote delivery */
3482 else if (Ustrcmp(argrest, "qs") == 0)
3484 f.queue_smtp = TRUE;
3485 arg_queue_only = FALSE;
3486 queue_only_set = TRUE;
3491 /* -oex: Sendmail error flags. As these are also accepted without the
3492 leading -o prefix, for compatibility with vacation and other callers,
3493 they are handled with -e above. */
3495 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3496 -oitrue: Another sendmail syntax for the same */
3499 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3504 /* -oM*: Set various characteristics for an incoming message; actually
3505 acted on for trusted callers only. */
3510 exim_fail("exim: data expected after -oM%s\n", argrest);
3512 /* -oMa: Set sender host address */
3514 if (Ustrcmp(argrest, "a") == 0)
3515 sender_host_address = string_copy_taint(
3516 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3517 EXIM_IPADDR_MAX, "-oMa"), GET_TAINTED);
3519 /* -oMaa: Set authenticator name */
3521 else if (Ustrcmp(argrest, "aa") == 0)
3522 sender_host_authenticated = string_copy_taint(
3523 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3524 EXIM_DRIVERNAME_MAX, "-oMaa"), GET_TAINTED);
3526 /* -oMas: setting authenticated sender */
3528 else if (Ustrcmp(argrest, "as") == 0)
3529 authenticated_sender = string_copy_taint(
3530 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3531 EXIM_EMAILADDR_MAX, "-oMas"), GET_TAINTED);
3533 /* -oMai: setting authenticated id */
3535 else if (Ustrcmp(argrest, "ai") == 0)
3536 authenticated_id = string_copy_taint(
3537 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3538 EXIM_EMAILADDR_MAX, "-oMai"), GET_TAINTED);
3540 /* -oMi: Set incoming interface address */
3542 else if (Ustrcmp(argrest, "i") == 0)
3543 interface_address = string_copy_taint(
3544 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3545 EXIM_IPADDR_MAX, "-oMi"), GET_TAINTED);
3547 /* -oMm: Message reference */
3549 else if (Ustrcmp(argrest, "m") == 0)
3551 if (!mac_ismsgid(argv[i+1]))
3552 exim_fail("-oMm must be a valid message ID\n");
3553 if (!f.trusted_config)
3554 exim_fail("-oMm must be called by a trusted user/config\n");
3555 message_reference = next_argv(argv, &i, argc, arg);
3558 /* -oMr: Received protocol */
3560 else if (Ustrcmp(argrest, "r") == 0)
3562 if (received_protocol)
3563 exim_fail("received_protocol is set already\n");
3565 if (++i >= argc) badarg = TRUE;
3567 received_protocol = string_copy_taint(
3568 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-oMr"),
3571 /* -oMs: Set sender host name */
3573 else if (Ustrcmp(argrest, "s") == 0)
3574 if (++i >= argc) badarg = TRUE;
3576 sender_host_name = string_copy_taint(
3577 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-oMs"),
3580 /* -oMt: Set sender ident */
3582 else if (Ustrcmp(argrest, "t") == 0)
3583 if (++i >= argc) badarg = TRUE;
3586 sender_ident_set = TRUE;
3587 sender_ident = string_copy_taint(
3588 exim_str_fail_toolong(argv[i], EXIM_IDENTUSER_MAX, "-oMt"),
3592 /* Else a bad argument */
3599 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3600 seem to call this as -m (undocumented), so that is also accepted (see
3602 /* -oo: An ancient flag for old-style addresses which still seems to
3603 crop up in some calls (see in SCO). */
3607 if (*argrest) badarg = TRUE;
3610 /* -oP <name>: set pid file path for daemon
3611 -oPX: delete pid file of daemon */
3614 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3615 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3616 "(uid=%d euid=%d | %d)\n",
3617 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3619 if (++i < argc) override_pid_file_path = argv[i];
3621 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3626 /* -or <n>: set timeout for non-SMTP acceptance
3627 -os <n>: set timeout for SMTP acceptance */
3632 int * tp = argrest[-1] == 'r'
3633 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3635 *tp = readconf_readtime(argrest, 0, FALSE);
3636 else if (i+1 < argc)
3637 *tp = readconf_readtime(argv[++i], 0, FALSE);
3640 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3644 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3645 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3648 if (*argrest || ++i >= argc) badarg = TRUE;
3649 else override_local_interfaces = string_copy_taint(
3650 exim_str_fail_toolong(argv[i], 1024, "-oX"), GET_TAINTED);
3653 /* -oY: Override creation of daemon notifier socket */
3656 if (*argrest) badarg = TRUE;
3657 else f.notifier_socket_en = FALSE;
3660 /* Unknown -o argument */
3668 /* -ps: force Perl startup; -pd force delayed Perl startup */
3672 if (*argrest == 's' && argrest[1] == 0)
3674 perl_start_option = 1;
3677 if (*argrest == 'd' && argrest[1] == 0)
3679 perl_start_option = -1;
3684 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3685 which sets the host protocol and host name */
3688 argrest = next_argv(argv, &i, argc, arg);
3692 uschar * hn = Ustrchr(argrest, ':');
3694 if (received_protocol)
3695 exim_fail("received_protocol is set already\n");
3698 received_protocol = string_copy_taint(
3699 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3703 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3704 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3705 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3710 /* -q: set up queue runs */
3714 BOOL two_stage, first_del, force, thaw = FALSE, local;
3716 receiving_message = FALSE;
3718 /* -qq...: Do queue runs in a 2-stage manner */
3720 if ((two_stage = *argrest == 'q'))
3723 /* -qi...: Do only first (initial) deliveries */
3725 if ((first_del = *argrest == 'i'))
3728 /* -qf...: Run the queue, forcing deliveries
3729 -qff..: Ditto, forcing thawing as well */
3731 if ((force = *argrest == 'f'))
3732 if ((thaw = *++argrest == 'f'))
3735 /* -q[f][f]l...: Run the queue only on local deliveries */
3737 if ((local = *argrest == 'l'))
3740 /* -q[f][f][l][G<name>]... Work on the named queue */
3742 if (*argrest == 'G')
3745 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3746 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3747 queue_name = string_copyn(argrest, i);
3749 if (*argrest == '/') argrest++;
3752 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3753 only, optionally named, optionally starting from a given message id. */
3755 if (!(list_queue || count_queue))
3760 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3762 q = alloc_onetime_qrunner();
3763 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3764 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3765 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3766 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3769 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3770 forced, optionally local only, optionally named. */
3777 if (*argrest) s = argrest;
3778 else if (++i < argc) { badarg = TRUE; break; }
3781 if ((intvl = readconf_readtime(s, 0, FALSE)) <= 0)
3782 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3784 for (qrunner * qq = qrunners; qq; qq = qq->next)
3785 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3786 || !queue_name && !qq->name)
3787 exim_fail("exim: queue-runner specified more than once\n");
3789 q = alloc_qrunner();
3790 q->interval = intvl;
3793 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3794 q->queue_run_force = force;
3795 q->deliver_force_thaw = thaw;
3796 q->queue_run_first_delivery = first_del;
3797 q->queue_run_local = local;
3798 q->queue_2stage = two_stage;
3805 case 'R': /* Synonymous with -qR... */
3806 case 'S': /* Synonymous with -qS... */
3808 const uschar * tainted_selectstr;
3811 receiving_message = FALSE;
3813 /* -Rf: As -R (below) but force all deliveries,
3814 -Rff: Ditto, but also thaw all frozen messages,
3815 -Rr: String is regex
3816 -Rrf: Regex and force
3817 -Rrff: Regex and force and thaw
3819 -S...: Like -R but works on sender.
3821 in all cases provided there are no further characters in this
3824 if (!qrunners) alloc_onetime_qrunner();
3825 qrunners->queue_2stage = f.queue_2stage;
3827 for (int i = 0; i < nelem(rsopts); i++)
3828 if (Ustrcmp(argrest, rsopts[i]) == 0)
3830 if (i != 2) qrunners->queue_run_force = TRUE;
3832 if (switchchar == 'R')
3833 f.deliver_selectstring_regex = TRUE;
3835 f.deliver_selectstring_sender_regex = TRUE;
3836 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3837 argrest += Ustrlen(rsopts[i]);
3840 /* -R or -S: Set string to match in addresses for forced queue run to
3841 pick out particular messages. */
3843 /* Avoid attacks from people providing very long strings, and do so before
3846 tainted_selectstr = argrest;
3847 else if (i+1 < argc)
3848 tainted_selectstr = argv[++i];
3850 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3852 s = string_copy_taint(
3853 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3856 if (switchchar == 'R')
3857 deliver_selectstring = s;
3859 deliver_selectstring_sender = s;
3864 /* -r: an obsolete synonym for -f (see above) */
3866 /* -Tqt is an option that is exclusively for use by the testing suite.
3867 It is not recognized in other circumstances. It allows for the setting up
3868 of explicit "queue times" so that various warning/retry things can be
3869 tested. Otherwise variability of clock ticks etc. cause problems. */
3872 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0 && ++i < argc)
3873 fudged_queue_times = string_copy_taint(argv[i], GET_TAINTED);
3878 /* -t: Set flag to extract recipients from body of message. */
3881 if (!*argrest) extract_recipients = TRUE;
3883 /* -ti: Set flag to extract recipients from body of message, and also
3884 specify that dot does not end the message. */
3886 else if (Ustrcmp(argrest, "i") == 0)
3888 extract_recipients = TRUE;
3892 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3895 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3902 /* -U: This means "initial user submission" in sendmail, apparently. The
3903 doc claims that in future sendmail may refuse syntactically invalid
3904 messages instead of fixing them. For the moment, we just ignore it. */
3910 /* -v: verify things - this is a very low-level debugging */
3915 debug_selector |= D_v;
3916 debug_file = stderr;
3922 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3924 The -x flag tells the sendmail command that mail from a local
3925 mail program has National Language Support (NLS) extended characters
3926 in the body of the mail item. The sendmail command can send mail with
3927 extended NLS characters across networks that normally corrupts these
3930 As Exim is 8-bit clean, it just ignores this flag. */
3933 if (*argrest) badarg = TRUE;
3936 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3937 logs to that file. We swallow the parameter and otherwise ignore it. */
3942 exim_fail("exim: string expected after -X\n");
3945 /* -z: a line of text to log */
3950 log_oneline = string_copy_taint(
3951 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3954 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3957 /* All other initial characters are errors */
3962 } /* End of high-level switch statement */
3964 /* Failed to recognize the option, or syntax error */
3967 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3968 "option %s\n", arg);
3972 /* If -R or -S have been specified without -q, assume a single queue run. */
3974 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3975 alloc_onetime_qrunner();
3979 store_pool = old_pool;
3982 /* If usage_wanted is set we call the usage function - which never returns */
3983 if (usage_wanted) exim_usage(called_as);
3985 /* Arguments have been processed. Check for incompatibilities. */
3986 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3987 && ( f.daemon_listen || qrunners || bi_option
3988 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3989 || filter_test != FTEST_NONE
3990 || msg_action_arg > 0 && !one_msg_action
3992 || ( msg_action_arg > 0
3993 && ( f.daemon_listen || is_multiple_qrun() || list_options
3994 || checking && msg_action != MSG_LOAD
3995 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3997 || ( (f.daemon_listen || is_multiple_qrun())
3998 && ( sender_address || list_options || list_queue || checking
4001 || f.daemon_listen && is_onetime_qrun()
4002 || f.inetd_wait_mode && qrunners
4004 && ( checking || smtp_input || extract_recipients
4005 || filter_test != FTEST_NONE || bi_option
4007 || ( verify_address_mode
4008 && ( f.address_test_mode || smtp_input || extract_recipients
4009 || filter_test != FTEST_NONE || bi_option
4011 || ( f.address_test_mode
4012 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
4016 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
4018 || deliver_selectstring && !qrunners
4019 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
4021 exim_fail("exim: incompatible command-line options or arguments\n");
4023 /* If debugging is set up, set the file and the file descriptor to pass on to
4024 child processes. It should, of course, be 2 for stderr. Also, force the daemon
4025 to run in the foreground. */
4027 if (debug_selector != 0)
4029 debug_file = stderr;
4030 debug_fd = fileno(debug_file);
4031 f.background_daemon = FALSE;
4032 testharness_pause_ms(100); /* lets caller finish */
4033 if (debug_selector != D_v) /* -v only doesn't show this */
4035 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
4036 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
4038 if (!version_printed)
4039 show_whats_supported(FALSE);
4043 /* When started with root privilege, ensure that the limits on the number of
4044 open files and the number of processes (where that is accessible) are
4045 sufficiently large, or are unset, in case Exim has been called from an
4046 environment where the limits are screwed down. Not all OS have the ability to
4047 change some of these limits. */
4051 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
4057 #ifdef RLIMIT_NOFILE
4058 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
4060 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
4062 rlp.rlim_cur = rlp.rlim_max = 0;
4065 /* I originally chose 1000 as a nice big number that was unlikely to
4066 be exceeded. It turns out that some older OS have a fixed upper limit of
4069 if (rlp.rlim_cur < 1000)
4071 rlp.rlim_cur = rlp.rlim_max = 1000;
4072 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4074 rlp.rlim_cur = rlp.rlim_max = 256;
4075 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4076 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
4083 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
4085 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
4087 rlp.rlim_cur = rlp.rlim_max = 0;
4090 # ifdef RLIM_INFINITY
4091 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
4093 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
4095 if (rlp.rlim_cur < 1000)
4097 rlp.rlim_cur = rlp.rlim_max = 1000;
4099 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
4100 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
4106 /* Exim is normally entered as root (but some special configurations are
4107 possible that don't do this). However, it always spins off sub-processes that
4108 set their uid and gid as required for local delivery. We don't want to pass on
4109 any extra groups that root may belong to, so we want to get rid of them all at
4112 We need to obey setgroups() at this stage, before possibly giving up root
4113 privilege for a changed configuration file, but later on we might need to
4114 check on the additional groups for the admin user privilege - can't do that
4115 till after reading the config, which might specify the exim gid. Therefore,
4116 save the group list here first. */
4118 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
4119 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
4121 /* There is a fundamental difference in some BSD systems in the matter of
4122 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
4123 known not to be different. On the "different" systems there is a single group
4124 list, and the first entry in it is the current group. On all other versions of
4125 Unix there is a supplementary group list, which is in *addition* to the current
4126 group. Consequently, to get rid of all extraneous groups on a "standard" system
4127 you pass over 0 groups to setgroups(), while on a "different" system you pass
4128 over a single group - the current group, which is always the first group in the
4129 list. Calling setgroups() with zero groups on a "different" system results in
4130 an error return. The following code should cope with both types of system.
4132 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
4133 the "setgroups() with zero groups" - and changes the egid.
4134 Thanks to that we had to stash the original_egid above, for use below
4135 in the call to exim_setugid().
4137 However, if this process isn't running as root, setgroups() can't be used
4138 since you have to be root to run it, even if throwing away groups.
4139 Except, sigh, for Hurd - where you can.
4140 Not being root here happens only in some unusual configurations. */
4143 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
4144 && setgroups(0, NULL) != 0
4146 && setgroups(1, group_list) != 0)
4147 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
4149 /* If the configuration file name has been altered by an argument on the
4150 command line (either a new file name or a macro definition) and the caller is
4151 not root, or if this is a filter testing run, remove any setuid privilege the
4152 program has and run as the underlying user.
4154 The exim user is locked out of this, which severely restricts the use of -C
4157 Otherwise, set the real ids to the effective values (should be root unless run
4158 from inetd, which it can either be root or the exim uid, if one is configured).
4160 There is a private mechanism for bypassing some of this, in order to make it
4161 possible to test lots of configurations automatically, without having either to
4162 recompile each time, or to patch in an actual configuration file name and other
4163 values (such as the path name). If running in the test harness, pretend that
4164 configuration file changes and macro definitions haven't happened. */
4167 (!f.trusted_config || /* Config changed, or */
4168 !macros_trusted(opt_D_used)) && /* impermissible macros and */
4169 real_uid != root_uid && /* Not root, and */
4170 !f.running_in_test_harness /* Not fudged */
4172 expansion_test /* expansion testing */
4174 filter_test != FTEST_NONE) /* Filter testing */
4176 setgroups(group_count, group_list);
4177 exim_setugid(real_uid, real_gid, FALSE,
4178 US"-C, -D, -be or -bf forces real uid");
4179 removed_privilege = TRUE;
4181 /* In the normal case when Exim is called like this, stderr is available
4182 and should be used for any logging information because attempts to write
4183 to the log will usually fail. To arrange this, we unset really_exim. However,
4184 if no stderr is available there is no point - we might as well have a go
4185 at the log (if it fails, syslog will be written).
4187 Note that if the invoker is Exim, the logs remain available. Messing with
4188 this causes unlogged successful deliveries. */
4190 if (log_stderr && real_uid != exim_uid)
4191 f.really_exim = FALSE;
4194 /* Privilege is to be retained for the moment. It may be dropped later,
4195 depending on the job that this Exim process has been asked to do. For now, set
4196 the real uid to the effective so that subsequent re-execs of Exim are done by a
4200 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4202 /* If testing a filter, open the file(s) now, before wasting time doing other
4203 setups and reading the message. */
4205 if (filter_test & FTEST_SYSTEM)
4206 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4207 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4210 if (filter_test & FTEST_USER)
4211 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4212 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4215 /* Initialise lookup_list
4216 If debugging, already called above via version reporting.
4217 In either case, we initialise the list of available lookups while running
4218 as root. All dynamically modules are loaded from a directory which is
4219 hard-coded into the binary and is code which, if not a module, would be
4220 part of Exim already. Ability to modify the content of the directory
4221 is equivalent to the ability to modify a setuid binary!
4223 This needs to happen before we read the main configuration. */
4225 init_misc_mod_list();
4227 /*XXX this excrescence could move to the testsuite standard config setup file */
4229 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4232 /* Read the main runtime configuration data; this gives up if there
4233 is a failure. It leaves the configuration file open so that the subsequent
4234 configuration data for delivery can be read if needed.
4236 NOTE: immediately after opening the configuration file we change the working
4237 directory to "/"! Later we change to $spool_directory. We do it there, because
4238 during readconf_main() some expansion takes place already. */
4240 /* Store the initial cwd before we change directories. Can be NULL if the
4241 dir has already been unlinked. */
4242 initial_cwd = os_getcwd(NULL, 0);
4243 if (!initial_cwd && errno)
4244 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4246 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4247 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4250 -be[m] expansion test -
4251 -b[fF] filter test new
4253 -bmalware malware_test_file new
4255 -brw rewrite test new
4257 -bv[s] address verify -
4259 -bP <option> (except -bP config, which sets list_config)
4261 If any of these options is set, we suppress warnings about configuration
4262 issues (currently about tls_advertise_hosts and keep_environment not being
4266 int old_pool = store_pool;
4267 #ifdef MEASURE_TIMING
4269 (void)gettimeofday(&t0, NULL);
4272 store_pool = POOL_CONFIG;
4273 readconf_main(checking || list_options);
4274 store_pool = old_pool;
4276 #ifdef MEASURE_TIMING
4277 report_time_since(&t0, US"readconf_main (delta)");
4281 /* Now in directory "/" */
4283 if (cleanup_environment() == FALSE)
4284 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4287 /* If an action on specific messages is requested, or if a daemon or queue
4288 runner is being started, we need to know if Exim was called by an admin user.
4289 This is the case if the real user is root or exim, or if the real group is
4290 exim, or if one of the supplementary groups is exim or a group listed in
4291 admin_groups. We don't fail all message actions immediately if not admin_user,
4292 since some actions can be performed by non-admin users. Instead, set admin_user
4293 for later interrogation. */
4295 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4296 f.admin_user = TRUE;
4298 for (int i = 0; i < group_count && !f.admin_user; i++)
4299 if (group_list[i] == exim_gid)
4300 f.admin_user = TRUE;
4301 else if (admin_groups)
4302 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4303 if (admin_groups[j] == group_list[i])
4304 f.admin_user = TRUE;
4306 /* Another group of privileged users are the trusted users. These are root,
4307 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4308 are permitted to specify sender_addresses with -f on the command line, and
4309 other message parameters as well. */
4311 if (real_uid == root_uid || real_uid == exim_uid)
4312 f.trusted_caller = TRUE;
4316 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4317 if (trusted_users[i] == real_uid)
4318 f.trusted_caller = TRUE;
4321 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4322 if (trusted_groups[i] == real_gid)
4323 f.trusted_caller = TRUE;
4324 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4325 if (trusted_groups[i] == group_list[j])
4326 f.trusted_caller = TRUE;
4329 /* At this point, we know if the user is privileged and some command-line
4330 options become possibly impermissible, depending upon the configuration file. */
4332 if (checking && commandline_checks_require_admin && !f.admin_user)
4333 exim_fail("exim: those command-line flags are set to require admin\n");
4335 /* Handle the decoding of logging options. */
4337 decode_bits(log_selector, log_selector_size, log_notall,
4338 log_selector_string, log_options, log_options_count, US"log", 0);
4342 debug_printf("configuration file is %s\n", config_main_filename);
4343 debug_printf("log selectors =");
4344 for (int i = 0; i < log_selector_size; i++)
4345 debug_printf(" %08x", log_selector[i]);
4349 /* If domain literals are not allowed, check the sender address that was
4350 supplied with -f. Ditto for a stripped trailing dot. */
4354 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4355 exim_fail("exim: bad -f address \"%s\": domain literals not "
4356 "allowed\n", sender_address);
4357 if (f_end_dot && !strip_trailing_dot)
4358 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4359 "(trailing dot not allowed)\n", sender_address);
4362 /* See if an admin user overrode our logging. */
4364 if (cmdline_syslog_name)
4367 syslog_processname = cmdline_syslog_name;
4368 log_file_path = string_copy(CUS"syslog");
4371 /* not a panic, non-privileged users should not be able to spam paniclog */
4373 "exim: you lack sufficient privilege to specify syslog process name\n");
4375 /* Paranoia check of maximum lengths of certain strings. There is a check
4376 on the length of the log file path in log.c, which will come into effect
4377 if there are any calls to write the log earlier than this. However, if we
4378 get this far but the string is very long, it is better to stop now than to
4379 carry on and (e.g.) receive a message and then have to collapse. The call to
4380 log_write() from here will cause the ultimate panic collapse if the complete
4381 file name exceeds the buffer length. */
4383 if (Ustrlen(log_file_path) > 200)
4384 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4385 "log_file_path is longer than 200 chars: aborting");
4387 if (Ustrlen(pid_file_path) > 200)
4388 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4389 "pid_file_path is longer than 200 chars: aborting");
4391 if (Ustrlen(spool_directory) > 200)
4392 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4393 "spool_directory is longer than 200 chars: aborting");
4395 /* Length check on the process name given to syslog for its TAG field,
4396 which is only permitted to be 32 characters or less. See RFC 3164. */
4398 if (Ustrlen(syslog_processname) > 32)
4399 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4400 "syslog_processname is longer than 32 chars: aborting");
4405 log_write(0, LOG_MAIN, "%s", log_oneline);
4406 return EXIT_SUCCESS;
4409 return EXIT_FAILURE;
4411 /* In some operating systems, the environment variable TMPDIR controls where
4412 temporary files are created; Exim doesn't use these (apart from when delivering
4413 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4414 If TMPDIR is found in the environment, reset it to the value defined in the
4415 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4416 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4417 EXIM_TMPDIR by the build scripts.
4421 if (environ) for (uschar ** p = USS environ; *p; p++)
4422 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4424 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4425 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4427 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4431 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4432 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4433 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4434 called by a user who has set the TZ variable. This then affects the timestamps
4435 in log files and in Received: headers, and any created Date: header lines. The
4436 required timezone is settable in the configuration file, so nothing can be done
4437 about this earlier - but hopefully nothing will normally be logged earlier than
4438 this. We have to make a new environment if TZ is wrong, but don't bother if
4439 timestamps_utc is set, because then all times are in UTC anyway. */
4441 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4442 f.timestamps_utc = TRUE;
4445 uschar *envtz = US getenv("TZ");
4447 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4448 : timezone_string != NULL
4451 uschar **p = USS environ;
4455 if (environ) while (*p++) count++;
4456 if (!envtz) count++;
4457 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4458 if (environ) for (p = USS environ; *p; p++)
4459 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4460 if (timezone_string)
4462 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4463 sprintf(CS *newp++, "TZ=%s", timezone_string);
4468 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4469 tod_stamp(tod_log));
4473 /* Handle the case when we have removed the setuid privilege because of -C or
4474 -D. This means that the caller of Exim was not root.
4476 There is a problem if we were running as the Exim user. The sysadmin may
4477 expect this case to retain privilege because "the binary was called by the
4478 Exim user", but it hasn't, because either the -D option set macros, or the
4479 -C option set a non-trusted configuration file. There are two possibilities:
4481 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4482 to do message deliveries. Thus, the fact that it is running as a
4483 non-privileged user is plausible, and might be wanted in some special
4484 configurations. However, really_exim will have been set false when
4485 privilege was dropped, to stop Exim trying to write to its normal log
4486 files. Therefore, re-enable normal log processing, assuming the sysadmin
4487 has set up the log directory correctly.
4489 (2) If deliver_drop_privilege is not set, the configuration won't work as
4490 apparently intended, and so we log a panic message. In order to retain
4491 root for -C or -D, the caller must either be root or be invoking a
4492 trusted configuration file (when deliver_drop_privilege is false). */
4494 if ( removed_privilege
4495 && (!f.trusted_config || opt_D_used)
4496 && real_uid == exim_uid)
4497 if (deliver_drop_privilege)
4498 f.really_exim = TRUE; /* let logging work normally */
4500 log_write(0, LOG_MAIN|LOG_PANIC,
4501 "exim user lost privilege for using %s option",
4502 f.trusted_config? "-D" : "-C");
4504 /* Start up Perl interpreter if Perl support is configured and there is a
4505 perl_startup option, and the configuration or the command line specifies
4506 initializing starting. Note that the global variables are actually called
4507 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4510 if (perl_start_option != 0)
4511 opt_perl_at_start = (perl_start_option > 0);
4512 if (opt_perl_at_start && opt_perl_startup != NULL)
4515 const misc_module_info * mi = misc_mod_find(US"perl", &errstr);
4516 typedef uschar * (*fn_t)(uschar *);
4519 exim_fail("exim: error finding perl module: %s\n", errstr);
4521 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4523 if ((errstr = (((fn_t *) mi->functions)[PERL_STARTUP]) (opt_perl_startup)))
4524 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4525 opt_perl_started = TRUE;
4527 #endif /* EXIM_PERL */
4529 /* Log the arguments of the call if the configuration file said so. This is
4530 a debugging feature for finding out what arguments certain MUAs actually use.
4531 Don't attempt it if logging is disabled, or if listing variables or if
4532 verifying/testing addresses or expansions. */
4534 if ( (debug_selector & D_any || LOGGING(arguments))
4535 && f.really_exim && !list_options && !checking)
4537 uschar *p = big_buffer;
4538 Ustrcpy(p, US"cwd= (failed)");
4545 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4546 p += Ustrlen(CCS p);
4549 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4551 for (int i = 0; i < argc; i++)
4553 int len = Ustrlen(argv[i]);
4554 const uschar *printing;
4556 if (p + len + 8 >= big_buffer + big_buffer_size)
4558 Ustrcpy(p, US" ...");
4559 log_write(0, LOG_MAIN, "%s", big_buffer);
4560 Ustrcpy(big_buffer, US"...");
4563 printing = string_printing(argv[i]);
4564 if (!*printing) quote = US"\"";
4567 const uschar *pp = printing;
4569 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4571 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4572 (p - big_buffer) - 4), printing, quote);
4575 if (LOGGING(arguments))
4576 log_write(0, LOG_MAIN, "%s", big_buffer);
4578 debug_printf("%s\n", big_buffer);
4581 /* Set the working directory to be the top-level spool directory. We don't rely
4582 on this in the code, which always uses fully qualified names, but it's useful
4583 for core dumps etc. Don't complain if it fails - the spool directory might not
4584 be generally accessible and calls with the -C option (and others) have lost
4585 privilege by now. Before the chdir, we try to ensure that the directory exists.
4588 if (Uchdir(spool_directory) != 0)
4590 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4591 (void) Uchdir(spool_directory);
4594 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4595 alias file. Exim doesn't have such a concept, but this call is screwed into
4596 Sun's YP makefiles. Handle this by calling a configured script, as the real
4597 user who called Exim. The -oA option can be used to pass an argument to the
4602 (void) fclose(config_file);
4603 if (bi_command && *bi_command)
4606 const uschar * argv[3];
4607 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4608 if (alias_arg) argv[i++] = alias_arg;
4611 setgroups(group_count, group_list);
4612 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4614 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4615 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4617 execv(CS argv[0], (char *const *)argv);
4618 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4622 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4627 /* We moved the admin/trusted check to be immediately after reading the
4628 configuration file. We leave these prints here to ensure that syslog setup,
4629 logfile setup, and so on has already happened. */
4631 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4632 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4634 /* Only an admin user may start the daemon or force a queue run in the default
4635 configuration, but the queue run restriction can be relaxed. Only an admin
4636 user may request that a message be returned to its sender forthwith. Only an
4637 admin user may specify a debug level greater than D_v (because it might show
4638 passwords, etc. in lookup queries). Only an admin user may request a queue
4639 count. Only an admin user can use the test interface to scan for email
4640 (because Exim will be in the spool dir and able to look at mails). */
4644 BOOL debugset = (debug_selector & ~D_v) != 0;
4645 if ( deliver_give_up || f.daemon_listen || malware_test_file
4646 || count_queue && queue_list_requires_admin
4647 || list_queue && queue_list_requires_admin
4648 || qrunners && prod_requires_admin
4649 || queue_name_dest && prod_requires_admin
4650 || debugset && !f.running_in_test_harness
4652 exim_fail("exim:%s permission denied; not admin\n",
4653 debugset ? " debugging" : "");
4656 /* If the real user is not root or the exim uid, the argument for passing
4657 in an open TCP/IP connection for another message is not permitted, nor is
4658 running with the -N option for any delivery action, unless this call to exim is
4659 one that supplied an input message, or we are using a patched exim for
4660 regression testing. */
4662 if ( real_uid != root_uid && real_uid != exim_uid
4663 && ( continue_hostname
4665 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4667 && !f.running_in_test_harness
4669 exim_fail("exim: Permission denied; not exim user or root\n");
4671 /* If the caller is not trusted, certain arguments are ignored when running for
4672 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4673 Note that authority for performing certain actions on messages is tested in the
4674 queue_action() function. */
4676 if (!f.trusted_caller && !checking)
4678 sender_host_name = sender_host_address = interface_address =
4679 sender_ident = received_protocol = NULL;
4680 sender_host_port = interface_port = 0;
4681 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4684 /* If a sender host address is set, extract the optional port number off the
4685 end of it and check its syntax. Do the same thing for the interface address.
4686 Exim exits if the syntax is bad. */
4690 if (sender_host_address)
4691 sender_host_port = check_port(sender_host_address);
4692 if (interface_address)
4693 interface_port = check_port(interface_address);
4696 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4699 if (f.trusted_caller)
4701 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4702 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4705 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4708 /* If an SMTP message is being received check to see if the standard input is a
4709 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4710 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4715 union sockaddr_46 inetd_sock;
4716 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4717 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4719 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4720 if (family == AF_INET || family == AF_INET6)
4722 union sockaddr_46 interface_sock;
4723 size = sizeof(interface_sock);
4725 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4726 interface_address = host_ntoa(-1, &interface_sock, NULL,
4729 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4731 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4734 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4735 NULL, &sender_host_port);
4736 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4737 "inetd is not supported when mua_wrapper is set");
4741 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4746 /* If the load average is going to be needed while receiving a message, get it
4747 now for those OS that require the first call to os_getloadavg() to be done as
4748 root. There will be further calls later for each message received. */
4750 #ifdef LOAD_AVG_NEEDS_ROOT
4751 if ( receiving_message
4752 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4753 load_average = OS_GETLOADAVG();
4756 /* The queue_only configuration option can be overridden by -odx on the command
4757 line, except that if queue_only_override is false, queue_only cannot be unset
4758 from the command line. */
4760 if (queue_only_set && (queue_only_override || arg_queue_only))
4761 queue_only = arg_queue_only;
4763 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4766 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4767 if (arg_smtp_receive_timeout >= 0)
4768 smtp_receive_timeout = arg_smtp_receive_timeout;
4770 /* If Exim was started with root privilege, unless we have already removed the
4771 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4772 except when starting the daemon or doing some kind of delivery or address
4773 testing (-bt). These are the only cases when root need to be retained. We run
4774 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4775 retained only for starting the daemon. We always do the initgroups() in this
4776 situation (controlled by the TRUE below), in order to be as close as possible
4777 to the state Exim usually runs in. */
4779 if ( !unprivileged /* originally had root AND */
4780 && !removed_privilege /* still got root AND */
4781 && !f.daemon_listen /* not starting the daemon */
4782 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4783 && ( /* AND EITHER */
4784 deliver_drop_privilege /* requested unprivileged */
4786 !qrunners /* not running the queue */
4787 && ( msg_action_arg < 0 /* and */
4788 || msg_action != MSG_DELIVER /* not delivering */
4790 && (!checking || !f.address_test_mode) /* not address checking */
4791 && !rcpt_verify_quota /* and not quota checking */
4793 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4795 /* When we are retaining a privileged uid, we still change to the exim gid. */
4800 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4801 rv = setgid(exim_gid);
4802 /* Impact of failure is that some stuff might end up with an incorrect group.
4803 We track this for failures from root, since any attempt to change privilege
4804 by root should succeed and failures should be examined. For non-root,
4805 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4806 no need to complain then. */
4808 if (!(unprivileged || removed_privilege))
4809 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4812 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4813 (long int)exim_gid, strerror(errno));
4817 /* Handle a request to scan a file for malware */
4818 if (malware_test_file)
4820 #ifdef WITH_CONTENT_SCAN
4822 set_process_info("scanning file for malware");
4823 if ((result = malware_in_file(malware_test_file)) == FAIL)
4825 printf("No malware found.\n");
4826 exim_exit(EXIT_SUCCESS);
4830 printf("Malware lookup returned non-okay/fail: %d\n", result);
4831 exim_exit(EXIT_FAILURE);
4834 printf("Malware found: %s\n", malware_name);
4836 printf("Malware scan detected malware of unknown name.\n");
4838 printf("Malware scanning not enabled at compile time.\n");
4840 exim_exit(EXIT_FAILURE);
4843 /* Handle a request to list the delivery queue */
4847 set_process_info("listing the queue");
4848 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4849 exim_exit(EXIT_SUCCESS);
4852 /* Handle a request to count the delivery queue */
4856 set_process_info("counting the queue");
4857 fprintf(stdout, "%u\n", queue_count());
4858 exim_exit(EXIT_SUCCESS);
4861 /* Handle actions on specific messages, except for the force delivery and
4862 message load actions, which are done below. Some actions take a whole list of
4863 message ids, which are known to continue up to the end of the arguments. Others
4864 take a single message id and then operate on the recipients list. */
4866 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4868 int yield = EXIT_SUCCESS;
4869 set_process_info("acting on specified messages");
4871 /* ACL definitions may be needed when removing a message (-Mrm) because
4872 event_action gets expanded */
4874 if (msg_action == MSG_REMOVE)
4876 int old_pool = store_pool;
4877 store_pool = POOL_CONFIG;
4879 store_pool = old_pool;
4880 store_writeprotect(POOL_CONFIG);
4883 if (!one_msg_action)
4885 for (i = msg_action_arg; i < argc; i++)
4886 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4887 yield = EXIT_FAILURE;
4890 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4891 default: printf("\n"); break;
4895 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4896 recipients_arg)) yield = EXIT_FAILURE;
4900 /* We used to set up here to skip reading the ACL section, on
4901 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4902 Now, since the intro of the ${acl } expansion, ACL definitions may be
4903 needed in transports so we lost the optimisation. */
4906 int old_pool = store_pool;
4907 #ifdef MEASURE_TIMING
4909 (void)gettimeofday(&t0, NULL);
4912 store_pool = POOL_CONFIG;
4914 store_pool = old_pool;
4916 /* -be can add macro definitions, needing to link to the macro structure
4917 chain. Otherwise, make the memory used for config data readonly. */
4919 if (!expansion_test)
4920 store_writeprotect(POOL_CONFIG);
4922 #ifdef MEASURE_TIMING
4923 report_time_since(&t0, US"readconf_rest (delta)");
4927 /* Handle a request to check quota */
4928 if (rcpt_verify_quota)
4929 if (real_uid != root_uid && real_uid != exim_uid)
4930 exim_fail("exim: Permission denied\n");
4931 else if (recipients_arg >= argc)
4932 exim_fail("exim: missing recipient for quota check\n");
4935 verify_quota(US argv[recipients_arg]); /*XXX we lose track of const here */
4936 exim_exit(EXIT_SUCCESS);
4939 /* Handle the -brt option. This is for checking out retry configurations.
4940 The next three arguments are a domain name or a complete address, and
4941 optionally two error numbers. All it does is to call the function that
4942 scans the retry configuration data. */
4944 if (test_retry_arg >= 0)
4946 retry_config *yield;
4947 int basic_errno = 0;
4949 const uschar *s1, *s2;
4951 if (test_retry_arg >= argc)
4953 printf("-brt needs a domain or address argument\n");
4954 exim_exit(EXIT_FAILURE);
4956 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4959 /* If the first argument contains no @ and no . it might be a local user
4960 or it might be a single-component name. Treat as a domain. */
4962 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4964 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4965 "being \ntreated as a one-component domain, not as a local part.\n\n",
4969 /* There may be an optional second domain arg. */
4971 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4972 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4974 /* The final arg is an error name */
4976 if (test_retry_arg < argc)
4978 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4980 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4983 printf("%s\n", CS error);
4984 return EXIT_FAILURE;
4987 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4988 code > 100 as an error is for matching codes to the decade. Turn them into
4989 a real error code, off the decade. */
4991 if (basic_errno == ERRNO_MAIL4XX ||
4992 basic_errno == ERRNO_RCPT4XX ||
4993 basic_errno == ERRNO_DATA4XX)
4995 int code = (more_errno >> 8) & 255;
4997 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4998 else if (code > 100)
4999 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
5003 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
5004 printf("No retry information found\n");
5007 more_errno = yield->more_errno;
5008 printf("Retry rule: %s ", yield->pattern);
5010 if (yield->basic_errno == ERRNO_EXIMQUOTA)
5012 printf("quota%s%s ",
5013 (more_errno > 0)? "_" : "",
5014 (more_errno > 0)? readconf_printtime(more_errno) : US"");
5016 else if (yield->basic_errno == ECONNREFUSED)
5018 printf("refused%s%s ",
5019 (more_errno > 0)? "_" : "",
5020 (more_errno == 'M')? "MX" :
5021 (more_errno == 'A')? "A" : "");
5023 else if (yield->basic_errno == ETIMEDOUT)
5026 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
5028 if (more_errno != 0) printf("_%s",
5029 (more_errno == 'M')? "MX" : "A");
5032 else if (yield->basic_errno == ERRNO_AUTHFAIL)
5033 printf("auth_failed ");
5036 for (retry_rule * r = yield->rules; r; r = r->next)
5038 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
5039 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
5045 printf(",%d.", x/1000);
5059 exim_exit(EXIT_SUCCESS);
5062 /* Handle a request to list one or more configuration options */
5063 /* If -n was set, we suppress some information */
5068 set_process_info("listing variables");
5069 if (recipients_arg >= argc)
5070 fail = !readconf_print(US"all", NULL, flag_n);
5071 else for (i = recipients_arg; i < argc; i++)
5074 (Ustrcmp(argv[i], "router") == 0 ||
5075 Ustrcmp(argv[i], "transport") == 0 ||
5076 Ustrcmp(argv[i], "authenticator") == 0 ||
5077 Ustrcmp(argv[i], "macro") == 0 ||
5078 Ustrcmp(argv[i], "environment") == 0))
5080 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
5084 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
5086 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
5091 set_process_info("listing config");
5092 exim_exit(readconf_print(US"config", NULL, flag_n)
5093 ? EXIT_SUCCESS : EXIT_FAILURE);
5097 /* Initialise subsystems as required. */
5101 /* Handle a request to deliver one or more messages that are already on the
5102 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
5103 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
5105 Delivery of specific messages is typically used for a small number when
5106 prodding by hand (when the option forced_delivery will be set) or when
5107 re-execing to regain root privilege. Each message delivery must happen in a
5108 separate process, so we fork a process for each one, and run them sequentially
5109 so that debugging output doesn't get intertwined, and to avoid spawning too
5110 many processes if a long list is given. However, don't fork for the last one;
5111 this saves a process in the common case when Exim is called to deliver just one
5114 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
5116 if (prod_requires_admin && !f.admin_user)
5118 fprintf(stderr, "exim: Permission denied\n");
5119 exim_exit(EXIT_FAILURE);
5121 set_process_info("delivering specified messages");
5122 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
5123 for (i = msg_action_arg; i < argc; i++)
5127 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
5128 that runs into a later copy into the untainted global message_id[] */
5129 /*XXX Do we need a length limit check here? */
5131 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5132 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
5134 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5135 exim_underbar_exit(EXIT_SUCCESS);
5139 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
5141 exim_exit(EXIT_FAILURE);
5145 exim_exit(EXIT_SUCCESS);
5149 /* If only a single queue run is requested, without SMTP listening, we can just
5150 turn into a queue runner, with an optional starting message id. */
5152 if (is_onetime_qrun() && !f.daemon_listen)
5154 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
5155 exim_exit(EXIT_SUCCESS);
5159 /* Find the login name of the real user running this process. This is always
5160 needed when receiving a message, because it is written into the spool file. It
5161 may also be used to construct a from: or a sender: header, and in this case we
5162 need the user's full name as well, so save a copy of it, checked for RFC822
5163 syntax and munged if necessary, if it hasn't previously been set by the -F
5164 argument. We may try to get the passwd entry more than once, in case NIS or
5165 other delays are in evidence. Save the home directory for use in filter testing
5170 if ((pw = getpwuid(real_uid)) != NULL)
5172 originator_login = string_copy(US pw->pw_name);
5173 originator_home = string_copy(US pw->pw_dir);
5175 /* If user name has not been set by -F, set it from the passwd entry
5176 unless -f has been used to set the sender address by a trusted user. */
5178 if (!originator_name)
5180 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5182 uschar *name = US pw->pw_gecos;
5183 uschar *amp = Ustrchr(name, '&');
5186 /* Most Unix specify that a '&' character in the gecos field is
5187 replaced by a copy of the login name, and some even specify that
5188 the first character should be upper cased, so that's what we do. */
5193 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5194 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5195 buffer[loffset] = toupper(buffer[loffset]);
5199 /* If a pattern for matching the gecos field was supplied, apply
5200 it and then expand the name string. */
5202 GET_OPTION("gecos_pattern");
5203 GET_OPTION("gecos_name");
5204 if (gecos_pattern && gecos_name)
5206 const pcre2_code *re;
5207 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5209 if (regex_match_and_setup(re, name, 0, -1))
5211 uschar *new_name = expand_string(gecos_name);
5215 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5216 "gecos field \"%s\"\n", new_name, name);
5219 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5220 "\"%s\": %s\n", gecos_name, expand_string_message);
5222 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5223 "gecos field \"%s\"\n", gecos_pattern, name);
5224 store_free((void *)re);
5226 originator_name = string_copy(name);
5229 /* A trusted caller has used -f but not -F */
5231 else originator_name = US"";
5234 /* Break the retry loop */
5239 if (++i > finduser_retries) break;
5243 /* If we cannot get a user login, log the incident and give up, unless the
5244 configuration specifies something to use. When running in the test harness,
5245 any setting of unknown_login overrides the actual name. */
5247 if (!originator_login || f.running_in_test_harness)
5249 GET_OPTION("unknown_login");
5252 originator_login = expand_string(unknown_login);
5253 if (!originator_name && unknown_username)
5254 originator_name = expand_string(unknown_username);
5255 if (!originator_name) originator_name = US"";
5257 if (!originator_login)
5258 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5262 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5265 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5267 /* If a message is created by this call of Exim, the uid/gid of its originator
5268 are those of the caller. These values are overridden if an existing message is
5269 read in from the spool. */
5271 originator_uid = real_uid;
5272 originator_gid = real_gid;
5274 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5275 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5277 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5278 returns. We leave this till here so that the originator_ fields are available
5279 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5282 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5286 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5287 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5288 "mua_wrapper is set");
5291 # ifndef DISABLE_TLS
5292 /* This also checks that the library linkage is working and we can call
5293 routines in it, so call even if tls_require_ciphers is unset */
5295 # ifdef MEASURE_TIMING
5297 (void)gettimeofday(&t0, NULL);
5299 if (!tls_dropprivs_validate_require_cipher(FALSE))
5300 exim_exit(EXIT_FAILURE);
5301 # ifdef MEASURE_TIMING
5302 report_time_since(&t0, US"validate_ciphers (delta)");
5310 /* If the sender ident has not been set (by a trusted caller) set it to
5311 the caller. This will get overwritten below for an inetd call. If a trusted
5312 caller has set it empty, unset it. */
5314 if (!sender_ident) sender_ident = originator_login;
5315 else if (!*sender_ident) sender_ident = NULL;
5317 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5318 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5319 originator_* variables set. */
5321 if (test_rewrite_arg >= 0)
5323 f.really_exim = FALSE;
5324 if (test_rewrite_arg >= argc)
5326 printf("-brw needs an address argument\n");
5327 exim_exit(EXIT_FAILURE);
5329 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5330 exim_exit(EXIT_SUCCESS);
5333 /* A locally-supplied message is considered to be coming from a local user
5334 unless a trusted caller supplies a sender address with -f, or is passing in the
5335 message via SMTP (inetd invocation or otherwise). */
5337 if ( !sender_address && !smtp_input
5338 || !f.trusted_caller && filter_test == FTEST_NONE)
5340 f.sender_local = TRUE;
5342 /* A trusted caller can supply authenticated_sender and authenticated_id
5343 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5344 defaults except when host checking. */
5346 if (!authenticated_sender && !host_checking)
5347 authenticated_sender = string_sprintf("%s@%s", originator_login,
5348 qualify_domain_sender);
5349 if (!authenticated_id && !host_checking)
5350 authenticated_id = originator_login;
5353 /* Trusted callers are always permitted to specify the sender address.
5354 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5355 is specified is the empty address. However, if a trusted caller does not
5356 specify a sender address for SMTP input, we leave sender_address unset. This
5357 causes the MAIL commands to be honoured. */
5359 if ( !smtp_input && !sender_address
5360 || !receive_check_set_sender(sender_address))
5362 /* Either the caller is not permitted to set a general sender, or this is
5363 non-SMTP input and the trusted caller has not set a sender. If there is no
5364 sender, or if a sender other than <> is set, override with the originator's
5365 login (which will get qualified below), except when checking things. */
5367 if ( !sender_address /* No sender_address set */
5369 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5370 !checking)) /* Not running tests, including filter tests */
5372 sender_address = originator_login;
5373 f.sender_address_forced = FALSE;
5374 sender_address_domain = 0;
5378 /* Remember whether an untrusted caller set the sender address */
5380 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5382 /* Ensure that the sender address is fully qualified unless it is the empty
5383 address, which indicates an error message, or doesn't exist (root caller, smtp
5384 interface, no -f argument). */
5386 if (sender_address && *sender_address && sender_address_domain == 0)
5387 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5388 qualify_domain_sender);
5390 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5392 /* Handle a request to verify a list of addresses, or test them for delivery.
5393 This must follow the setting of the sender address, since routers can be
5394 predicated upon the sender. If no arguments are given, read addresses from
5395 stdin. Set debug_level to at least D_v to get full output for address testing.
5398 if (verify_address_mode || f.address_test_mode)
5401 int flags = vopt_qualify;
5403 if (verify_address_mode)
5405 if (!verify_as_sender) flags |= vopt_is_recipient;
5406 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5411 flags |= vopt_is_recipient;
5412 debug_selector |= D_v;
5413 debug_file = stderr;
5414 debug_fd = fileno(debug_file);
5415 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5418 if (recipients_arg < argc)
5419 while (recipients_arg < argc)
5421 /* Supplied addresses are tainted since they come from a user */
5422 uschar * s = string_copy_taint(
5423 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5427 BOOL finished = FALSE;
5428 uschar *ss = parse_find_address_end(s, FALSE);
5429 if (*ss == ',') *ss = 0; else finished = TRUE;
5430 test_address(s, flags, &exit_value);
5433 while (*++s == ',' || isspace(*s)) ;
5439 uschar * s = get_stdinput(NULL, NULL);
5441 test_address(string_copy_taint(
5442 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5444 flags, &exit_value);
5448 exim_exit(exit_value);
5451 /* Handle expansion checking. Either expand items on the command line, or read
5452 from stdin if there aren't any. If -Mset was specified, load the message so
5453 that its variables can be used, but restrict this facility to admin users.
5454 Otherwise, if -bem was used, read a message from stdin. */
5458 dns_init(FALSE, FALSE, FALSE);
5459 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5463 exim_fail("exim: permission denied\n");
5464 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5465 /* Checking the length of the ID is sufficient to validate it.
5466 Get an untainted version so file opens can be done. */
5467 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5469 spoolname = string_sprintf("%s-H", message_id);
5470 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5471 printf ("Failed to load message datafile %s\n", message_id);
5472 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5473 printf ("Failed to load message %s\n", message_id);
5476 /* Read a test message from a file. We fudge it up to be on stdin, saving
5477 stdin itself for later reading of expansion strings. */
5479 else if (expansion_test_message)
5481 uschar * rme = expand_string(recipients_max);
5482 int save_stdin = dup(0);
5483 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5485 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5488 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5489 message_ended = END_NOTENDED;
5490 recipients_max_expanded = atoi(CCS rme);
5491 read_message_body(receive_msg(extract_recipients));
5492 message_linecount += body_linecount;
5493 (void)dup2(save_stdin, 0);
5494 (void)close(save_stdin);
5495 clearerr(stdin); /* Required by Darwin */
5498 /* Only admin users may see config-file macros this way */
5500 if (!f.admin_user) macros_user = macros = mlast = NULL;
5502 /* Allow $recipients for this testing */
5504 f.enable_dollar_recipients = TRUE;
5506 /* Expand command line items */
5508 if (recipients_arg < argc)
5510 config_filename = US"-be args";
5511 for (config_lineno = 1; recipients_arg < argc; config_lineno++)
5512 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++],
5513 EXIM_EMAILADDR_MAX, "-be arg"));
5520 char *(*fn_readline)(const char *) = NULL;
5521 void (*fn_addhist)(const char *) = NULL;
5525 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5528 config_filename = US"-be stdin";
5529 for (config_lineno = 1; s = get_stdinput(fn_readline, fn_addhist);
5531 expansion_test_line(s);
5534 if (dlhandle) dlclose(dlhandle);
5538 /* The data file will be open after -Mset */
5540 if (deliver_datafile >= 0)
5542 (void)close(deliver_datafile);
5543 deliver_datafile = -1;
5546 exim_exit(EXIT_SUCCESS);
5550 /* The active host name is normally the primary host name, but it can be varied
5551 for hosts that want to play several parts at once. We need to ensure that it is
5552 set for host checking, and for receiving messages. */
5554 smtp_active_hostname = primary_hostname;
5555 GET_OPTION("smtp_active_hostname");
5556 if (raw_active_hostname)
5558 uschar * nah = expand_string(raw_active_hostname);
5561 if (!f.expand_string_forcedfail)
5562 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5563 "(smtp_active_hostname): %s", raw_active_hostname,
5564 expand_string_message);
5566 else if (nah[0]) smtp_active_hostname = nah;
5569 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5570 given IP address so that the blocking and relay configuration can be tested.
5571 Unless a sender_ident was set by -oMt, we discard it (the default is the
5572 caller's login name). An RFC 1413 call is made only if we are running in the
5573 test harness and an incoming interface and both ports are specified, because
5574 there is no TCP/IP call to find the ident for. */
5581 if (!sender_ident_set)
5583 sender_ident = NULL;
5584 if (f.running_in_test_harness && sender_host_port
5585 && interface_address && interface_port)
5586 verify_get_ident(1223); /* note hardwired port number */
5589 /* In case the given address is a non-canonical IPv6 address, canonicalize
5590 it. Use the compressed form for IPv6. */
5592 size = host_aton(sender_host_address, x);
5593 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5595 (void) host_nmtoa(size, x, -1, sender_host_address, ':');
5597 (void) ipv6_nmtoa(x, sender_host_address);
5599 /* Now set up for testing */
5601 host_build_sender_fullhost();
5605 f.sender_local = FALSE;
5606 f.sender_host_notsocket = TRUE;
5607 debug_file = stderr;
5608 debug_fd = fileno(debug_file);
5609 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5610 "**** but without any ident (RFC 1413) callback.\n"
5611 "**** This is not for real!\n\n",
5612 sender_host_address);
5614 set_connection_id();
5615 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5616 if (verify_check_host(&hosts_connection_nolog) == OK)
5618 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5619 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5621 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5623 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5624 because a log line has already been written for all its failure exists
5625 (usually "connection refused: <reason>") and writing another one is
5626 unnecessary clutter. */
5628 if (smtp_start_session())
5631 for (; (reset_point = store_mark()); store_reset(reset_point))
5633 if (smtp_setup_msg() <= 0) break;
5634 if (!receive_msg(FALSE)) break;
5636 return_path = sender_address = NULL;
5637 dnslist_domain = dnslist_matched = NULL;
5639 deliver_localpart_orig = NULL;
5640 deliver_domain_orig = NULL;
5641 callout_address = sending_ip_address = NULL;
5642 deliver_localpart_data = deliver_domain_data =
5643 recipient_data = sender_data = NULL;
5644 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5648 exim_exit(EXIT_SUCCESS);
5652 /* Arrange for message reception if recipients or SMTP were specified;
5653 otherwise complain unless a version print (-bV) happened or this is a filter
5654 verification test or info dump.
5655 In the former case, show the configuration file name. */
5657 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5659 if (version_printed)
5661 if (Ustrchr(config_main_filelist, ':'))
5662 printf("Configuration file search path is %s\n", config_main_filelist);
5663 printf("Configuration file is %s\n", config_main_filename);
5664 return EXIT_SUCCESS;
5667 if (info_flag != CMDINFO_NONE)
5669 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5670 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5673 if (filter_test == FTEST_NONE)
5674 exim_usage(called_as);
5678 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5679 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5680 that we are not called from inetd, because that is rejected above. The
5681 following configuration settings are forced here:
5683 (1) Synchronous delivery (-odi)
5684 (2) Errors to stderr (-oep == -oeq)
5685 (3) No parallel remote delivery
5686 (4) Unprivileged delivery
5688 We don't force overall queueing options because there are several of them;
5689 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5690 to override any SMTP queueing. */
5694 f.synchronous_delivery = TRUE;
5695 arg_error_handling = ERRORS_STDERR;
5696 remote_max_parallel = 1;
5697 deliver_drop_privilege = TRUE;
5698 f.queue_smtp = FALSE;
5699 queue_smtp_domains = NULL;
5701 message_utf8_downconvert = -1; /* convert-if-needed */
5706 /* Prepare to accept one or more new messages on the standard input. When a
5707 message has been read, its id is returned in message_id[]. If doing immediate
5708 delivery, we fork a delivery process for each received message, except for the
5709 last one, where we can save a process switch.
5711 It is only in non-smtp mode that error_handling is allowed to be changed from
5712 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5713 sendmail error modes other than -oem ever actually used? Later: yes.) */
5715 if (!smtp_input) error_handling = arg_error_handling;
5717 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5718 logging being sent down the socket and make an identd call to get the
5721 else if (f.is_inetd)
5723 (void)fclose(stderr);
5724 exim_nullstd(); /* Re-open to /dev/null */
5725 verify_get_ident(IDENT_PORT);
5726 host_build_sender_fullhost();
5727 set_process_info("handling incoming connection from %s via inetd",
5731 /* If the sender host address has been set, build sender_fullhost if it hasn't
5732 already been done (which it will have been for inetd). This caters for the
5733 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5734 so that the test for IP options is skipped for -bs input. */
5736 if (sender_host_address && !sender_fullhost)
5738 host_build_sender_fullhost();
5739 set_process_info("handling incoming connection from %s via -oMa",
5741 f.sender_host_notsocket = TRUE;
5744 /* Otherwise, set the sender host as unknown except for inetd calls. This
5745 prevents host checking in the case of -bs not from inetd and also for -bS. */
5747 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5749 /* If stdout does not exist, then dup stdin to stdout. This can happen
5750 if exim is started from inetd. In this case fd 0 will be set to the socket,
5751 but fd 1 will not be set. This also happens for passed SMTP channels. */
5753 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5755 /* Set up the incoming protocol name and the state of the program. Root is
5756 allowed to force received protocol via the -oMr option above. If we have come
5757 via inetd, the process info has already been set up. We don't set
5758 received_protocol here for smtp input, as it varies according to
5759 batch/HELO/EHLO/AUTH/TLS. */
5763 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5764 smtp_batched_input? "batched " : "",
5765 sender_address ? sender_address : originator_login);
5769 int old_pool = store_pool;
5770 store_pool = POOL_PERM;
5771 if (!received_protocol)
5772 received_protocol = string_sprintf("local%s", called_as);
5773 store_pool = old_pool;
5774 set_process_info("accepting a local non-SMTP message from <%s>",
5778 /* Initialize the session_local_queue-only flag (this will be ignored if
5779 mua_wrapper is set) */
5782 session_local_queue_only = queue_only;
5784 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5785 the spool if so configured. On failure, we must not attempt to send an error
5786 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5787 error code is given.) */
5789 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5790 exim_fail("exim: insufficient disk space\n");
5792 /* If this is smtp input of any kind, real or batched, handle the start of the
5795 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5796 because a log line has already been written for all its failure exists
5797 (usually "connection refused: <reason>") and writing another one is
5798 unnecessary clutter. */
5800 set_connection_id();
5805 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5806 if (verify_check_host(&hosts_connection_nolog) == OK)
5808 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5809 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5811 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5812 if (!smtp_start_session())
5815 exim_exit(EXIT_SUCCESS);
5819 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5820 (we handle buferring so as to have visibility of fill level). */
5824 GET_OPTION("message_size_limit");
5825 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5826 if (expand_string_message)
5827 if (thismessage_size_limit == -1)
5828 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5829 "message_size_limit: %s", expand_string_message);
5831 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5832 "message_size_limit: %s", expand_string_message);
5834 setvbuf(stdin, NULL, _IONBF, 0);
5837 /* Loop for several messages when reading SMTP input. If we fork any child
5838 processes, we don't want to wait for them unless synchronous delivery is
5839 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5840 same as SIG_DFL, despite the fact that documentation often lists the default as
5841 "ignore". This is a confusing area. This is what I know:
5843 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5844 processes that complete simply to go away without ever becoming defunct. You
5845 can't then wait for them - but we don't want to wait for them in the
5846 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5847 happen for all OS (e.g. *BSD is different).
5849 But that's not the end of the story. Some (many? all?) systems have the
5850 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5851 has by default, so it seems that the difference is merely one of default
5852 (compare restarting vs non-restarting signals).
5854 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5855 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5856 of the loop below. Paranoia rules.
5858 February 2003: That's *still* not the end of the story. There are now versions
5859 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5860 process then calls waitpid(), a grumble is written to the system log, because
5861 this is logically inconsistent. In other words, it doesn't like the paranoia.
5862 As a consequence of this, the waitpid() below is now excluded if we are sure
5863 that SIG_IGN works. */
5865 if (!f.synchronous_delivery)
5868 struct sigaction act;
5869 act.sa_handler = SIG_IGN;
5870 sigemptyset(&(act.sa_mask));
5871 act.sa_flags = SA_NOCLDWAIT;
5872 sigaction(SIGCHLD, &act, NULL);
5874 signal(SIGCHLD, SIG_IGN);
5878 /* Save the current store pool point, for resetting at the start of
5879 each message, and save the real sender address, if any. */
5881 real_sender_address = sender_address;
5883 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5884 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5887 for (BOOL more = TRUE; more; )
5889 rmark reset_point = store_mark();
5892 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5893 input and build the recipients list, before calling receive_msg() to read the
5894 message proper. Whatever sender address is given in the SMTP transaction is
5895 often ignored for local senders - we use the actual sender, which is normally
5896 either the underlying user running this process or a -f argument provided by
5897 a trusted caller. It is saved in real_sender_address. The test for whether to
5898 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5903 if ((rc = smtp_setup_msg()) > 0)
5905 if ( real_sender_address
5906 && !receive_check_set_sender(sender_address))
5908 sender_address = raw_sender = real_sender_address;
5909 sender_address_unrewritten = NULL;
5912 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5913 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5914 the very end. The result of the ACL is ignored (as for other non-SMTP
5915 messages). It is run for its potential side effects. */
5917 if (smtp_batched_input)
5919 GET_OPTION("acl_not_smtp_start");
5920 if (acl_not_smtp_start)
5922 uschar * user_msg, * log_msg;
5923 f.enable_dollar_recipients = TRUE;
5924 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5925 &user_msg, &log_msg);
5926 f.enable_dollar_recipients = FALSE;
5930 /* Now get the data for the message */
5932 more = receive_msg(extract_recipients);
5935 cancel_cutthrough_connection(TRUE, US"receive dropped");
5936 if (more) goto MORELOOP;
5937 smtp_log_no_mail(); /* Log no mail if configured */
5938 exim_exit(EXIT_FAILURE);
5943 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5944 smtp_log_no_mail(); /* Log no mail if configured */
5945 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5949 /* In the non-SMTP case, we have all the information from the command
5950 line, but must process it in case it is in the more general RFC822
5951 format, and in any case, to detect syntax errors. Also, it appears that
5952 the use of comma-separated lists as single arguments is common, so we
5953 had better support them. */
5957 uschar * rme = expand_string(recipients_max);
5958 int rcount = 0, count = argc - recipients_arg;
5959 const uschar ** list = argv + recipients_arg;
5961 recipients_max_expanded = atoi(CCS rme);
5963 /* These options cannot be changed dynamically for non-SMTP messages */
5965 f.active_local_sender_retain = local_sender_retain;
5966 f.active_local_from_check = local_from_check;
5968 /* Save before any rewriting */
5970 raw_sender = string_copy(sender_address);
5972 /* Loop for each argument (supplied by user hence tainted) */
5974 for (int i = 0; i < count; i++)
5976 int start, end, domain;
5978 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5979 We'll still want to cap it to something, just in case. */
5980 uschar * s = string_copy_taint(
5981 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5984 /* Loop for each comma-separated address */
5988 BOOL finished = FALSE;
5990 uschar * ss = parse_find_address_end(s, FALSE);
5992 if (*ss == ',') *ss = 0; else finished = TRUE;
5994 /* Check max recipients - if -t was used, these aren't recipients */
5996 if ( recipients_max_expanded > 0 && ++rcount > recipients_max_expanded
5997 && !extract_recipients)
5999 DEBUG(D_all) debug_printf("excess reipients (max %d)\n",
6000 recipients_max_expanded);
6002 if (error_handling == ERRORS_STDERR)
6004 fprintf(stderr, "exim: too many recipients\n");
6005 exim_exit(EXIT_FAILURE);
6009 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
6010 errors_sender_rc : EXIT_FAILURE;
6015 BOOL b = allow_utf8_domains;
6016 allow_utf8_domains = TRUE;
6019 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
6023 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
6024 else allow_utf8_domains = b;
6029 if (domain == 0 && !f.allow_unqualified_recipient)
6032 errmess = US"unqualified recipient address not allowed";
6037 DEBUG(D_all) debug_printf("bad recipient address \"%s\": %s\n",
6038 string_printing(list[i]), errmess);
6040 if (error_handling == ERRORS_STDERR)
6042 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
6043 string_printing(list[i]), errmess);
6044 exim_exit(EXIT_FAILURE);
6050 eblock.text1 = string_printing(list[i]);
6051 eblock.text2 = errmess;
6053 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
6054 errors_sender_rc : EXIT_FAILURE;
6058 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
6061 while (*++s && (*s == ',' || isspace(*s)));
6065 /* Show the recipients when debugging */
6069 if (sender_address) debug_printf("Sender: %s\n", sender_address);
6070 if (recipients_list)
6072 debug_printf("Recipients:\n");
6073 for (int i = 0; i < recipients_count; i++)
6074 debug_printf(" %s\n", recipients_list[i].address);
6078 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
6079 ignored; rejecting here would just add complication, and it can just as
6080 well be done later. Allow $recipients to be visible in the ACL. */
6082 GET_OPTION("acl_not_smtp_start");
6083 if (acl_not_smtp_start)
6085 uschar * user_msg, * log_msg;
6086 f.enable_dollar_recipients = TRUE;
6087 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
6088 &user_msg, &log_msg);
6089 f.enable_dollar_recipients = FALSE;
6092 /* Pause for a while waiting for input. If none received in that time,
6093 close the logfile, if we had one open; then if we wait for a long-running
6094 datasource (months, in one use-case) log rotation will not leave us holding
6097 if (!receive_timeout)
6098 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
6101 /* Read the data for the message. If filter_test is not FTEST_NONE, this
6102 will just read the headers for the message, and not write anything onto the
6105 message_ended = END_NOTENDED;
6106 more = receive_msg(extract_recipients);
6108 /* more is always FALSE here (not SMTP message) when reading a message
6109 for real; when reading the headers of a message for filter testing,
6110 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
6112 if (!message_id[0]) exim_exit(EXIT_FAILURE);
6113 } /* Non-SMTP message reception */
6115 /* If this is a filter testing run, there are headers in store, but
6116 no message on the spool. Run the filtering code in testing mode, setting
6117 the domain to the qualify domain and the local part to the current user,
6118 unless they have been set by options. The prefix and suffix are left unset
6119 unless specified. The the return path is set to to the sender unless it has
6120 already been set from a return-path header in the message. */
6122 if (filter_test != FTEST_NONE)
6124 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
6125 deliver_domain_orig = deliver_domain;
6126 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
6127 deliver_localpart_orig = deliver_localpart;
6128 deliver_localpart_prefix = US ftest_prefix;
6129 deliver_localpart_suffix = US ftest_suffix;
6130 deliver_home = originator_home;
6134 printf("Return-path copied from sender\n");
6135 return_path = string_copy(sender_address);
6138 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
6139 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
6141 receive_add_recipient(
6142 string_sprintf("%s%s%s@%s",
6143 ftest_prefix ? ftest_prefix : US"",
6145 ftest_suffix ? ftest_suffix : US"",
6146 deliver_domain), -1);
6148 printf("Recipient = %s\n", recipients_list[0].address);
6149 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
6150 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
6152 if (chdir("/")) /* Get away from wherever the user is running this from */
6154 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
6155 exim_exit(EXIT_FAILURE);
6158 /* Now we run either a system filter test, or a user filter test, or both.
6159 In the latter case, headers added by the system filter will persist and be
6160 available to the user filter. We need to copy the filter variables
6163 if (filter_test & FTEST_SYSTEM)
6164 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
6165 exim_exit(EXIT_FAILURE);
6167 memcpy(filter_sn, filter_n, sizeof(filter_sn));
6169 if (filter_test & FTEST_USER)
6170 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
6171 exim_exit(EXIT_FAILURE);
6173 exim_exit(EXIT_SUCCESS);
6176 /* Else act on the result of message reception. We should not get here unless
6177 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
6178 will be TRUE. If it is not, check on the number of messages received in this
6181 if ( !session_local_queue_only
6182 && smtp_accept_queue_per_connection > 0
6183 && receive_messagecount > smtp_accept_queue_per_connection)
6185 session_local_queue_only = TRUE;
6186 queue_only_reason = 2;
6189 /* Initialize local_queue_only from session_local_queue_only. If it is false,
6190 and queue_only_load is set, check that the load average is below it. If it is
6191 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
6192 default), we put the whole session into queue_only mode. It then remains this
6193 way for any subsequent messages on the same SMTP connection. This is a
6194 deliberate choice; even though the load average may fall, it doesn't seem
6195 right to deliver later messages on the same call when not delivering earlier
6196 ones. However, there are odd cases where this is not wanted, so this can be
6197 changed by setting queue_only_load_latch false. */
6199 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
6200 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
6202 queue_only_reason = 3;
6203 if (queue_only_load_latch) session_local_queue_only = TRUE;
6206 /* If running as an MUA wrapper, all queueing options and freezing options
6210 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6212 /* Log the queueing here, when it will get a message id attached, but
6213 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6216 if (local_queue_only)
6218 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6219 switch(queue_only_reason)
6222 log_write(L_delay_delivery,
6223 LOG_MAIN, "no immediate delivery: more than %d messages "
6224 "received in one connection", smtp_accept_queue_per_connection);
6228 log_write(L_delay_delivery,
6229 LOG_MAIN, "no immediate delivery: load average %.2f",
6230 (double)load_average/1000.0);
6235 else if (f.queue_only_policy || f.deliver_freeze)
6236 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6238 /* Else do the delivery unless the ACL or local_scan() called for queue only
6239 or froze the message. Always deliver in a separate process. A fork failure is
6240 not a disaster, as the delivery will eventually happen on a subsequent queue
6241 run. The search cache must be tidied before the fork, as the parent will
6242 do it before exiting. The child will trigger a lookup failure and
6243 thereby defer the delivery if it tries to use (for example) a cached ldap
6244 connection that the parent has called unbind on. */
6251 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6254 close_unwanted(); /* Close unwanted file descriptors and TLS */
6255 exim_nullstd(); /* Ensure std{in,out,err} exist */
6257 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6258 mode, deliver_drop_privilege is forced TRUE). */
6260 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6262 delivery_re_exec(CEE_EXEC_EXIT);
6263 /* Control does not return here. */
6266 /* No need to re-exec */
6268 rc = deliver_message(message_id, FALSE, FALSE);
6270 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6271 ? EXIT_SUCCESS : EXIT_FAILURE);
6276 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6277 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6278 "process: %s", strerror(errno));
6282 release_cutthrough_connection(US"msg passed for delivery");
6284 /* In the parent, wait if synchronous delivery is required. This will
6285 always be the case in MUA wrapper mode. */
6287 if (f.synchronous_delivery)
6290 while (wait(&status) != pid);
6291 if ((status & 0x00ff) != 0)
6292 log_write(0, LOG_MAIN|LOG_PANIC,
6293 "process %d crashed with signal %d while delivering %s",
6294 (int)pid, status & 0x00ff, message_id);
6295 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6300 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6301 automatically reaps children (see comments above the loop), clear away any
6302 finished subprocesses here, in case there are lots of messages coming in
6303 from the same source. */
6305 #ifndef SIG_IGN_WORKS
6306 while (waitpid(-1, NULL, WNOHANG) > 0);
6310 return_path = sender_address = NULL;
6311 authenticated_sender = NULL;
6312 deliver_localpart_orig = NULL;
6313 deliver_domain_orig = NULL;
6314 deliver_host = deliver_host_address = NULL;
6315 dnslist_domain = dnslist_matched = NULL;
6316 #ifdef WITH_CONTENT_SCAN
6317 malware_name = NULL;
6320 callout_address = NULL;
6321 sending_ip_address = NULL;
6322 deliver_localpart_data = deliver_domain_data =
6323 recipient_data = sender_data = NULL;
6325 lookup_value = NULL; /* Can be set by ACL */
6327 store_reset(reset_point);
6330 exim_exit(EXIT_SUCCESS); /* Never returns */
6331 return 0; /* To stop compiler warning */