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_SIEVE_FILTER
1225 g = string_cat(g, US" Sieve_filter");
1227 #ifdef SUPPORT_CRYPTEQ
1228 g = string_cat(g, US" crypteq");
1230 #ifdef EXPAND_DLFUNC
1231 g = string_cat(g, US" Expand_dlfunc");
1234 g = string_cat(g, US" iconv()");
1237 g = string_cat(g, US" IPv6");
1240 g = string_cat(g, US" PAM");
1243 g = string_cat(g, US" Perl");
1246 g = string_cat(g, US" GnuTLS");
1248 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1249 g = string_cat(g, US" move_frozen_messages");
1252 g = string_cat(g, US" OpenSSL");
1254 #if defined(CYRUS_PWCHECK_SOCKET)
1255 g = string_cat(g, US" pwcheck");
1257 #if defined(RADIUS_CONFIG_FILE)
1258 g = string_cat(g, US" radius");
1260 #ifndef DISABLE_TLS_RESUME
1261 g = string_cat(g, US" TLS_resume");
1263 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1264 g = string_cat(g, US" translate_ip_address");
1266 #ifdef USE_TCP_WRAPPERS
1267 g = string_cat(g, US" TCPwrappers");
1269 #ifdef HAVE_SETCLASSRESOURCES
1270 g = string_cat(g, US" use_setclassresources");
1273 g = string_cat(g, US" DANE");
1275 #ifndef DISABLE_DKIM
1276 g = string_cat(g, US" DKIM");
1278 #ifdef SUPPORT_DMARC
1279 g = string_cat(g, US" DMARC");
1281 #ifndef DISABLE_DNSSEC
1282 g = string_cat(g, US" DNSSEC");
1284 #ifndef DISABLE_ESMTP_LIMITS
1285 g = string_cat(g, US" ESMTP_Limits");
1287 #ifndef DISABLE_WELLKNOWN
1288 g = string_cat(g, US" ESMTP_Wellknown");
1290 #ifndef DISABLE_EVENT
1291 g = string_cat(g, US" Event");
1294 g = string_cat(g, US" I18N");
1296 #ifndef DISABLE_OCSP
1297 g = string_cat(g, US" OCSP");
1299 #ifndef DISABLE_PIPE_CONNECT
1300 g = string_cat(g, US" PIPECONNECT");
1302 #ifndef DISABLE_PRDR
1303 g = string_cat(g, US" PRDR");
1305 #ifdef SUPPORT_PROXY
1306 g = string_cat(g, US" PROXY");
1308 #ifndef DISABLE_QUEUE_RAMP
1309 g = string_cat(g, US" Queue_Ramp");
1311 #ifdef SUPPORT_SOCKS
1312 g = string_cat(g, US" SOCKS");
1315 g = string_cat(g, US" SPF");
1317 #if defined(SUPPORT_SRS)
1318 g = string_cat(g, US" SRS");
1322 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1324 #ifdef EXPERIMENTAL_ARC
1325 g = string_cat(g, US" Experimental_ARC");
1327 #ifdef EXPERIMENTAL_BRIGHTMAIL
1328 g = string_cat(g, US" Experimental_Brightmail");
1330 #ifdef EXPERIMENTAL_DCC
1331 g = string_cat(g, US" Experimental_DCC");
1333 #ifdef EXPERIMENTAL_DSN_INFO
1334 g = string_cat(g, US" Experimental_DSN_info");
1336 #ifdef EXPERIMENTAL_QUEUEFILE
1337 g = string_cat(g, US" Experimental_QUEUEFILE");
1339 #ifdef EXPERIMENTAL_XCLIENT
1340 g = string_cat(g, US" Experimental_XCLIENT");
1342 g = string_cat(g, US"\n");
1344 g = lookup_show_supported(g);
1345 g = auth_show_supported(g);
1346 g = route_show_supported(g);
1347 g = transport_show_supported(g);
1349 #ifdef WITH_CONTENT_SCAN
1350 g = malware_show_supported(g);
1352 show_string(is_stdout, g); g = NULL;
1354 if (fixed_never_users[0] > 0)
1357 g = string_cat(g, US"Fixed never_users: ");
1358 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1359 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1360 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1363 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1365 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1367 /* Everything else is details which are only worth reporting when debugging.
1368 Perhaps the tls_version_report should move into this too. */
1372 /* clang defines __GNUC__ (at least, for me) so test for it first */
1373 #if defined(__clang__)
1374 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1375 #elif defined(__GNUC__)
1377 g = string_fmt_append(g, "Compiler: GCC [%s]\n", __VERSION__);
1379 g = string_fmt_append(g, "Compiler: GCC [%s]\n", "? unknown version ?";
1382 g = string_cat(g, US"Compiler: <unknown>\n");
1385 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1386 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1387 __GLIBC__, __GLIBC_MINOR__);
1388 if (__GLIBC_PREREQ(2, 1))
1389 g = string_fmt_append(g, " Runtime: %s\n",
1390 gnu_get_libc_version());
1393 g = show_db_version(g);
1396 g = tls_version_report(g);
1399 g = utf8_version_report(g);
1402 /*XXX do we need a "show misc-mods version-report" ?
1403 Currently they are output in misc_mod_add() */
1405 show_string(is_stdout, g);
1408 for (auth_info * ai = auths_available; ai; ai = (auth_info *)ai->drinfo.next)
1409 if (ai->version_report)
1410 g = (*ai->version_report)(g);
1412 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1413 characters; unless it's an ancient version of PCRE in which case it
1415 #ifndef PCRE_PRERELEASE
1416 # define PCRE_PRERELEASE
1419 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1422 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1423 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1425 PCRE2_MAJOR, PCRE2_MINOR,
1426 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1430 #undef EXPAND_AND_QUOTE
1432 show_string(is_stdout, g);
1436 tree_walk(lookups_tree, lookup_version_report_cb, &g);
1437 show_string(is_stdout, g);
1439 init_misc_mod_list();
1441 #ifdef WHITELIST_D_MACROS
1442 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1444 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1446 #ifdef TRUSTED_CONFIG_LIST
1447 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1449 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1453 show_string(is_stdout, g);
1454 store_reset(reset_point);
1458 /*************************************************
1459 * Show auxiliary information about Exim *
1460 *************************************************/
1463 show_exim_information(enum commandline_info request, FILE *stream)
1468 fprintf(stream, "Oops, something went wrong.\n");
1472 "The -bI: flag takes a string indicating which information to provide.\n"
1473 "If the string is not recognised, you'll get this help (on stderr).\n"
1475 " exim -bI:help this information\n"
1476 " exim -bI:dscp list of known dscp value keywords\n"
1477 " exim -bI:sieve list of supported sieve extensions\n"
1482 const misc_module_info * mi;
1483 typedef void (*fn_t)(FILE *);
1484 if ((mi = misc_mod_find(US"sieve_filter", NULL)))
1485 (((fn_t *) mi->functions)[SIEVE_EXTENSIONS]) (stream);
1487 fprintf(stream, "Sieve filtering not available\n");
1491 dscp_list_to_stream(stream);
1497 /*************************************************
1498 * Quote a local part *
1499 *************************************************/
1501 /* This function is used when a sender address or a From: or Sender: header
1502 line is being created from the caller's login, or from an authenticated_id. It
1503 applies appropriate quoting rules for a local part.
1505 Argument: the local part
1506 Returns: the local part, quoted if necessary
1510 local_part_quote(const uschar * lpart)
1512 BOOL needs_quote = FALSE;
1515 for (const uschar * t = lpart; !needs_quote && *t; t++)
1516 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1517 (*t != '.' || t == lpart || t[1] == 0);
1519 if (!needs_quote) return lpart;
1521 g = string_catn(NULL, US"\"", 1);
1525 uschar * nq = US Ustrpbrk(lpart, "\\\"");
1528 g = string_cat(g, lpart);
1531 g = string_catn(g, lpart, nq - lpart);
1532 g = string_catn(g, US"\\", 1);
1533 g = string_catn(g, nq, 1);
1537 g = string_catn(g, US"\"", 1);
1538 return string_from_gstring(g);
1544 /*************************************************
1545 * Load readline() functions *
1546 *************************************************/
1548 /* This function is called from testing executions that read data from stdin,
1549 but only when running as the calling user. Currently, only -be does this. The
1550 function loads the readline() function library and passes back the functions.
1551 On some systems, it needs the curses library, so load that too, but try without
1552 it if loading fails. All this functionality has to be requested at build time.
1555 fn_readline_ptr pointer to where to put the readline pointer
1556 fn_addhist_ptr pointer to where to put the addhistory function
1558 Returns: the dlopen handle or NULL on failure
1562 set_readline(char * (**fn_readline_ptr)(const char *),
1563 void (**fn_addhist_ptr)(const char *))
1566 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1568 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1569 if (dlhandle_curses) dlclose(dlhandle_curses);
1573 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1574 * char * readline (const char *prompt);
1575 * void add_history (const char *string);
1577 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1578 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1581 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1589 /*************************************************
1590 * Get a line from stdin for testing things *
1591 *************************************************/
1593 /* This function is called when running tests that can take a number of lines
1594 of input (for example, -be and -bt). It handles continuations and trailing
1595 spaces. And prompting and a blank line output on eof. If readline() is in use,
1596 the arguments are non-NULL and provide the relevant functions.
1599 fn_readline readline function or NULL
1600 fn_addhist addhist function or NULL
1602 Returns: pointer to dynamic memory, or NULL at end of file
1606 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1609 BOOL had_input = FALSE;
1611 if (!fn_readline) { printf("> "); fflush(stdout); }
1613 for (int i = 0;; i++)
1615 uschar buffer[1024];
1619 char *readline_line = NULL;
1622 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1623 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1624 p = US readline_line;
1629 /* readline() not in use */
1632 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1636 /* Handle the line */
1639 ss = p + Ustrlen(p);
1640 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1643 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1645 g = string_catn(g, p, ss - p);
1648 if (fn_readline) free(readline_line);
1651 /* g can only be NULL if ss==p */
1652 if (ss == p || gstring_last_char(g) != '\\') /* not continuation; done */
1655 gstring_trim(g, 1); /* drop the \ */
1658 if (had_input) return g ? string_from_gstring(g) : US"";
1665 /*************************************************
1666 * Output usage information for the program *
1667 *************************************************/
1669 /* This function is called when there are no recipients
1670 or a specific --help argument was added.
1673 progname information on what name we were called by
1675 Returns: DOES NOT RETURN
1679 exim_usage(const uschar * progname)
1682 /* Handle specific program invocation variants */
1683 if (Ustrcmp(progname, US"-mailq") == 0)
1685 "mailq - list the contents of the mail queue\n\n"
1686 "For a list of options, see the Exim documentation.\n");
1688 /* Generic usage - we output this whatever happens */
1690 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1691 "not directly from a shell command line. Options and/or arguments control\n"
1692 "what it does when called. For a list of options, see the Exim documentation.\n");
1697 /*************************************************
1698 * Validate that the macros given are okay *
1699 *************************************************/
1701 /* Typically, Exim will drop privileges if macros are supplied. In some
1702 cases, we want to not do so.
1704 Arguments: opt_D_used - true if the commandline had a "-D" option
1705 Returns: true if trusted, false otherwise
1709 macros_trusted(BOOL opt_D_used)
1711 #ifdef WHITELIST_D_MACROS
1712 uschar *whitelisted, *end, *p, **whites;
1713 int white_count, i, n;
1715 BOOL prev_char_item, found;
1720 #ifndef WHITELIST_D_MACROS
1724 /* We only trust -D overrides for some invoking users:
1725 root, the exim run-time user, the optional config owner user.
1726 I don't know why config-owner would be needed, but since they can own the
1727 config files anyway, there's no security risk to letting them override -D. */
1728 if ( ! ((real_uid == root_uid)
1729 || (real_uid == exim_uid)
1730 #ifdef CONFIGURE_OWNER
1731 || (real_uid == config_uid)
1735 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1739 /* Get a list of macros which are whitelisted */
1740 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1741 prev_char_item = FALSE;
1743 for (p = whitelisted; *p != '\0'; ++p)
1745 if (*p == ':' || isspace(*p))
1750 prev_char_item = FALSE;
1753 if (!prev_char_item)
1754 prev_char_item = TRUE;
1761 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1762 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1767 if (i == white_count)
1769 while (*p != '\0' && p < end)
1775 /* The list of commandline macros should be very short.
1776 Accept the N*M complexity. */
1777 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1780 for (uschar ** w = whites; *w; ++w)
1781 if (Ustrcmp(*w, m->name) == 0)
1788 if (!m->replacement)
1790 if ((len = m->replen) == 0)
1792 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1795 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1801 /*************************************************
1802 * Expansion testing *
1803 *************************************************/
1805 /* Expand and print one item, doing macro-processing.
1808 item line for expansion
1812 expansion_test_line(const uschar * line)
1818 Ustrncpy(big_buffer, line, big_buffer_size);
1819 big_buffer[big_buffer_size-1] = '\0';
1820 len = Ustrlen(big_buffer);
1822 (void) macros_expand(0, &len, &dummy_macexp);
1824 #ifdef LOOKUP_MODULE_DIR
1825 //mod_load_check(big_buffer);
1828 if (isupper(big_buffer[0]))
1830 if (macro_read_assignment(big_buffer))
1831 printf("Defined macro '%s'\n", mlast->name);
1833 else if (Ustrncmp(big_buffer, "set,t ", 6) == 0)
1834 printf("%s\n", acl_standalone_setvar(big_buffer+6, TRUE));
1835 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1836 printf("%s\n", acl_standalone_setvar(big_buffer+4, FALSE));
1838 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1839 else printf("Failed: %s\n", expand_string_message);
1844 /*************************************************
1845 * Queue-runner operations *
1846 *************************************************/
1848 /* Prefix a new qrunner descriptor to the qrunners list */
1853 qrunner * q = qrunners;
1854 qrunners = store_get(sizeof(qrunner), GET_UNTAINTED);
1855 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1857 qrunners->next_tick = time(NULL); /* run right away */
1862 alloc_onetime_qrunner(void)
1864 qrunners = store_get_perm(sizeof(qrunner), GET_UNTAINTED);
1865 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1866 qrunners->next_tick = time(NULL); /* run right away */
1867 qrunners->run_max = 1;
1872 /*************************************************
1873 * Entry point and high-level code *
1874 *************************************************/
1876 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1877 the appropriate action. All the necessary functions are present in the one
1878 binary. I originally thought one should split it up, but it turns out that so
1879 much of the apparatus is needed in each chunk that one might as well just have
1880 it all available all the time, which then makes the coding easier as well.
1883 argc count of entries in argv
1884 argv argument strings, with argv[0] being the program name
1886 Returns: EXIT_SUCCESS if terminated successfully
1887 EXIT_FAILURE otherwise, except when a message has been sent
1888 to the sender, and -oee was given
1892 main(int argc, char ** cargv)
1894 const uschar ** argv = CUSS cargv;
1895 int arg_receive_timeout = -1;
1896 int arg_smtp_receive_timeout = -1;
1897 int arg_error_handling = error_handling;
1898 int filter_sfd = -1;
1899 int filter_ufd = -1;
1902 int list_queue_option = QL_BASIC;
1904 int msg_action_arg = -1;
1905 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1906 int queue_only_reason = 0;
1908 int perl_start_option = 0;
1910 int recipients_arg = argc;
1911 int sender_address_domain = 0;
1912 int test_retry_arg = -1;
1913 int test_rewrite_arg = -1;
1914 gid_t original_egid;
1915 BOOL arg_queue_only = FALSE;
1916 BOOL bi_option = FALSE;
1917 BOOL checking = FALSE;
1918 BOOL count_queue = FALSE;
1919 BOOL expansion_test = FALSE;
1920 BOOL extract_recipients = FALSE;
1921 BOOL flag_G = FALSE;
1922 BOOL flag_n = FALSE;
1923 BOOL forced_delivery = FALSE;
1924 BOOL f_end_dot = FALSE;
1925 BOOL deliver_give_up = FALSE;
1926 BOOL list_queue = FALSE;
1927 BOOL list_options = FALSE;
1928 BOOL list_config = FALSE;
1929 BOOL local_queue_only;
1930 BOOL one_msg_action = FALSE;
1931 BOOL opt_D_used = FALSE;
1932 BOOL queue_only_set = FALSE;
1933 BOOL receiving_message = TRUE;
1934 BOOL sender_ident_set = FALSE;
1935 BOOL session_local_queue_only;
1937 BOOL removed_privilege = FALSE;
1938 BOOL usage_wanted = FALSE;
1939 BOOL verify_address_mode = FALSE;
1940 BOOL verify_as_sender = FALSE;
1941 BOOL rcpt_verify_quota = FALSE;
1942 BOOL version_printed = FALSE;
1943 const uschar * alias_arg = NULL;
1944 const uschar * called_as = US"";
1945 const uschar * cmdline_syslog_name = NULL;
1946 const uschar * start_queue_run_id = NULL;
1947 const uschar * stop_queue_run_id = NULL;
1948 const uschar * expansion_test_message = NULL;
1949 const uschar * ftest_domain = NULL;
1950 const uschar * ftest_localpart = NULL;
1951 const uschar * ftest_prefix = NULL;
1952 const uschar * ftest_suffix = NULL;
1953 uschar * log_oneline = NULL;
1954 const uschar * malware_test_file = NULL;
1955 const uschar * real_sender_address;
1956 uschar * originator_home = US"/";
1960 struct stat statbuf;
1961 pid_t passed_qr_pid = (pid_t)0;
1962 int passed_qr_pipe = -1;
1963 gid_t group_list[EXIM_GROUPLIST_SIZE];
1965 /* For the -bI: flag */
1966 enum commandline_info info_flag = CMDINFO_NONE;
1967 BOOL info_stdout = FALSE;
1969 /* Possible options for -R and -S */
1971 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1973 /* Need to define this in case we need to change the environment in order
1974 to get rid of a bogus time zone. We have to make it char rather than uschar
1975 because some OS define it in /usr/include/unistd.h. */
1977 extern char **environ;
1979 #ifdef MEASURE_TIMING
1980 (void)gettimeofday(×tamp_startup, NULL);
1983 store_init(); /* Initialise the memory allocation susbsystem */
1984 pcre_init(); /* Set up memory handling for pcre */
1986 /* If the Exim user and/or group and/or the configuration file owner/group were
1987 defined by ref:name at build time, we must now find the actual uid/gid values.
1988 This is a feature to make the lives of binary distributors easier. */
1990 #ifdef EXIM_USERNAME
1991 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1994 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1996 /* If ref:name uses a number as the name, route_finduser() returns
1997 TRUE with exim_uid set and pw coerced to NULL. */
1999 exim_gid = pw->pw_gid;
2000 #ifndef EXIM_GROUPNAME
2003 "exim: ref:name should specify a usercode, not a group.\n"
2004 "exim: can't let you get away with it unless you also specify a group.\n");
2008 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
2011 #ifdef EXIM_GROUPNAME
2012 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
2013 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
2016 #ifdef CONFIGURE_OWNERNAME
2017 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
2018 exim_fail("exim: failed to find uid for user name \"%s\"\n",
2019 CONFIGURE_OWNERNAME);
2022 /* We default the system_filter_user to be the Exim run-time user, as a
2023 sane non-root value. */
2024 system_filter_uid = exim_uid;
2026 #ifdef CONFIGURE_GROUPNAME
2027 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
2028 exim_fail("exim: failed to find gid for group name \"%s\"\n",
2029 CONFIGURE_GROUPNAME);
2032 /* In the Cygwin environment, some initialization used to need doing.
2033 It was fudged in by means of this macro; now no longer but we'll leave
2034 it in case of others. */
2040 /* Check a field which is patched when we are running Exim within its
2041 testing harness; do a fast initial check, and then the whole thing. */
2043 f.running_in_test_harness =
2044 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
2045 if (f.running_in_test_harness)
2048 /* Protect against abusive argv[0] */
2049 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
2050 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
2052 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
2053 at the start of a program; however, it seems that some environments do not
2054 follow this. A "strange" locale can affect the formatting of timestamps, so we
2057 setlocale(LC_ALL, "C");
2059 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
2061 #ifdef _POSIX_MONOTONIC_CLOCK
2065 /* Set up the default handler for timing using alarm(). */
2067 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2069 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
2070 because store_malloc writes a log entry on failure. */
2072 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
2073 exim_fail("exim: failed to get store for log buffer\n");
2075 /* Initialize the default log options. */
2077 bits_set(log_selector, log_selector_size, log_default);
2079 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
2080 NULL when the daemon is run and the file is closed. We have to use this
2081 indirection, because some systems don't allow writing to the variable "stderr".
2084 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
2086 /* Ensure there is a big buffer for temporary use in several places. It is put
2087 in malloc store so that it can be freed for enlargement if necessary. */
2089 big_buffer = store_malloc(big_buffer_size);
2091 /* Set up the handler for the data request signal, and set the initial
2092 descriptive text. */
2094 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
2095 set_process_info("initializing");
2096 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
2099 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
2100 sigaction(SIGSEGV, &act, NULL);
2103 signal(SIGSEGV, segv_handler); /* log faults */
2106 /* If running in a dockerized environment, the TERM signal is only
2107 delegated to the PID 1 if we request it by setting an signal handler */
2109 if (getpid() == 1) signal(SIGTERM, term_handler);
2111 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
2112 in the daemon code. For the rest of Exim's uses, we ignore it. */
2114 signal(SIGHUP, SIG_IGN);
2116 /* We don't want to die on pipe errors as the code is written to handle
2117 the write error instead. */
2119 signal(SIGPIPE, SIG_IGN);
2121 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
2122 set to SIG_IGN. This causes subprocesses that complete before the parent
2123 process waits for them not to hang around, so when Exim calls wait(), nothing
2124 is there. The wait() code has been made robust against this, but let's ensure
2125 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
2126 ending status. We use sigaction rather than plain signal() on those OS where
2127 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
2128 problem on AIX with this.) */
2132 struct sigaction act;
2133 act.sa_handler = SIG_DFL;
2134 sigemptyset(&(act.sa_mask));
2136 sigaction(SIGCHLD, &act, NULL);
2139 signal(SIGCHLD, SIG_DFL);
2142 /* Save the arguments for use if we re-exec exim as a daemon after receiving
2147 /* Set up the version number. Set up the leading 'E' for the external form of
2148 message ids, set the pointer to the internal form, and initialize it to
2149 indicate no message being processed. */
2152 message_id_option[0] = '-';
2153 message_id_external = message_id_option + 1;
2154 message_id_external[0] = 'E';
2155 message_id = message_id_external + 1;
2158 /* Set the umask to zero so that any files Exim creates using open() are
2159 created with the modes that it specifies. NOTE: Files created with fopen() have
2160 a problem, which was not recognized till rather late (February 2006). With this
2161 umask, such files will be world writeable. (They are all content scanning files
2162 in the spool directory, which isn't world-accessible, so this is not a
2163 disaster, but it's untidy.) I don't want to change this overall setting,
2164 however, because it will interact badly with the open() calls. Instead, there's
2165 now a function called modefopen() that fiddles with the umask while calling
2170 /* Precompile the regular expression for matching a message id. Keep this in
2171 step with the code that generates ids in the accept.c module. We need to do
2172 this here, because the -M options check their arguments for syntactic validity
2173 using mac_ismsgid, which uses this. */
2176 regex_must_compile(US"^(?:"
2177 "[^\\W_]{" str(MESSAGE_ID_TIME_LEN) "}"
2178 "-[^\\W_]{" str(MESSAGE_ID_PID_LEN) "}"
2179 "-[^\\W_]{" str(MESSAGE_ID_SUBTIME_LEN) "}"
2181 "(?:[^\\W_]{6}-){2}[^\\W_]{2}" /* old ID format */
2185 /* Precompile the regular expression that is used for matching an SMTP error
2186 code, possibly extended, at the start of an error message. Note that the
2187 terminating whitespace character is included. */
2190 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2193 #ifdef WHITELIST_D_MACROS
2194 /* Precompile the regular expression used to filter the content of macros
2195 given to -D for permissibility. */
2197 regex_whitelisted_macro =
2198 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2201 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2202 this seems to be a generally accepted convention, since one finds symbolic
2203 links called "mailq" in standard OS configurations. */
2205 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2206 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2209 receiving_message = FALSE;
2210 called_as = US"-mailq";
2213 /* If the program is called as "rmail" treat it as equivalent to
2214 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2215 i.e. preventing a single dot on a line from terminating the message, and
2216 returning with zero return code, even in cases of error (provided an error
2217 message has been sent). */
2219 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2220 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2223 called_as = US"-rmail";
2224 errors_sender_rc = EXIT_SUCCESS;
2227 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2228 this is a smail convention. */
2230 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2231 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2233 smtp_input = smtp_batched_input = TRUE;
2234 called_as = US"-rsmtp";
2237 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2238 this is a smail convention. */
2240 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2241 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2243 alloc_onetime_qrunner();
2244 receiving_message = FALSE;
2245 called_as = US"-runq";
2248 /* If the program is called as "newaliases" treat it as equivalent to
2249 "exim -bi"; this is a sendmail convention. */
2251 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2252 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2255 receiving_message = FALSE;
2256 called_as = US"-newaliases";
2259 /* Save the original effective uid for a couple of uses later. It should
2260 normally be root, but in some esoteric environments it may not be. */
2262 original_euid = geteuid();
2263 original_egid = getegid();
2265 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2266 to be the same as the real ones. This makes a difference only if Exim is setuid
2267 (or setgid) to something other than root, which could be the case in some
2268 special configurations. */
2270 real_uid = getuid();
2271 real_gid = getgid();
2273 if (real_uid == root_uid)
2275 if ((rv = setgid(real_gid)))
2276 exim_fail("exim: setgid(%ld) failed: %s\n",
2277 (long int)real_gid, strerror(errno));
2278 if ((rv = setuid(real_uid)))
2279 exim_fail("exim: setuid(%ld) failed: %s\n",
2280 (long int)real_uid, strerror(errno));
2283 /* If neither the original real uid nor the original euid was root, Exim is
2284 running in an unprivileged state. */
2286 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2288 /* For most of the args-parsing we need to use permanent pool memory */
2290 int old_pool = store_pool;
2291 store_pool = POOL_PERM;
2293 /* Scan the program's arguments. Some can be dealt with right away; others are
2294 simply recorded for checking and handling afterwards. Do a high-level switch
2295 on the second character (the one after '-'), to save some effort. */
2297 for (i = 1; i < argc; i++)
2299 BOOL badarg = FALSE;
2300 const uschar * arg = argv[i];
2301 const uschar * argrest;
2304 /* An argument not starting with '-' is the start of a recipients list;
2305 break out of the options-scanning loop. */
2313 /* An option consisting of -- terminates the options */
2315 if (Ustrcmp(arg, "--") == 0)
2317 recipients_arg = i + 1;
2321 /* Handle flagged options */
2323 switchchar = arg[1];
2326 /* Make all -ex options synonymous with -oex arguments, since that
2327 is assumed by various callers. Also make -qR options synonymous with -R
2328 options, as that seems to be required as well. Allow for -qqR too, and
2329 the same for -S options. */
2331 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2332 Ustrncmp(arg+1, "qR", 2) == 0 ||
2333 Ustrncmp(arg+1, "qS", 2) == 0)
2335 switchchar = arg[2];
2338 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2340 switchchar = arg[3];
2342 f.queue_2stage = TRUE;
2345 /* Make -r synonymous with -f, since it is a documented alias */
2347 else if (arg[1] == 'r') switchchar = 'f';
2349 /* Make -ov synonymous with -v */
2351 else if (Ustrcmp(arg, "-ov") == 0)
2357 /* deal with --option_aliases */
2358 else if (switchchar == '-')
2360 if (Ustrcmp(argrest, "help") == 0)
2362 usage_wanted = TRUE;
2365 else if (Ustrcmp(argrest, "version") == 0)
2372 /* High-level switch on active initial letter */
2377 /* sendmail uses -Ac and -Am to control which .cf file is used;
2380 if (!*argrest) { badarg = TRUE; break; }
2383 BOOL ignore = FALSE;
2388 if (*(argrest + 1) == '\0')
2392 if (!ignore) badarg = TRUE;
2396 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2397 so has no need of it. */
2400 if (!*argrest) i++; /* Skip over the type */
2406 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2410 /* -bd: Run in daemon mode, awaiting SMTP connections.
2411 -bdf: Ditto, but in the foreground.
2414 f.daemon_listen = f.daemon_scion = TRUE;
2415 if (*argrest == 'f') f.background_daemon = FALSE;
2416 else if (*argrest) badarg = TRUE;
2419 /* -be: Run in expansion test mode
2420 -bem: Ditto, but read a message from a file first
2423 expansion_test = checking = TRUE;
2424 if (*argrest == 'm')
2426 if (++i >= argc) { badarg = TRUE; break; }
2427 expansion_test_message = argv[i];
2430 if (*argrest) badarg = TRUE;
2433 /* -bF: Run system filter test */
2435 filter_test |= checking = FTEST_SYSTEM;
2436 if (*argrest) badarg = TRUE;
2437 else if (++i < argc) filter_test_sfile = argv[i];
2438 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2441 /* -bf: Run user filter test
2442 -bfd: Set domain for filter testing
2443 -bfl: Set local part for filter testing
2444 -bfp: Set prefix for filter testing
2445 -bfs: Set suffix for filter testing
2450 filter_test |= checking = FTEST_USER;
2451 if (++i < argc) filter_test_ufile = argv[i];
2452 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2457 exim_fail("exim: string expected after %s\n", arg);
2458 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2459 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2460 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2461 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2466 /* -bh: Host checking - an IP address must follow. */
2468 if ( (!*argrest || Ustrcmp(argrest, "c") == 0)
2471 sender_host_address = string_copy_taint(
2472 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2474 host_checking = checking = f.log_testing_mode = TRUE;
2475 f.host_checking_callout = *argrest == 'c';
2476 message_logs = FALSE;
2482 /* -bi: This option is used by sendmail to initialize *the* alias file,
2483 though it has the -oA option to specify a different file. Exim has no
2484 concept of *the* alias file, but since Sun's YP make script calls
2485 sendmail this way, some support must be provided. */
2487 if (!*argrest) bi_option = TRUE;
2491 /* -bI: provide information, of the type to follow after a colon.
2492 This is an Exim flag. */
2494 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2496 const uschar * p = argrest+1;
2497 info_flag = CMDINFO_HELP;
2499 if (strcmpic(p, CUS"sieve") == 0)
2501 info_flag = CMDINFO_SIEVE;
2504 else if (strcmpic(p, CUS"dscp") == 0)
2506 info_flag = CMDINFO_DSCP;
2509 else if (strcmpic(p, CUS"help") == 0)
2515 /* -bm: Accept and deliver message - the default option. Reinstate
2516 receiving_message, which got turned off for all -b options.
2517 -bmalware: test the filename given for malware */
2519 if (!*argrest) receiving_message = TRUE;
2520 else if (Ustrcmp(argrest, "alware") == 0)
2522 if (++i >= argc) { badarg = TRUE; break; }
2524 malware_test_file = argv[i];
2529 /* -bnq: For locally originating messages, do not qualify unqualified
2530 addresses. In the envelope, this causes errors; in header lines they
2533 if (Ustrcmp(argrest, "q") == 0)
2535 f.allow_unqualified_sender = FALSE;
2536 f.allow_unqualified_recipient = FALSE;
2541 /* -bpxx: List the contents of the mail queue, in various forms. If
2542 the option is -bpc, just a queue count is needed. Otherwise, if the
2543 first letter after p is r, then order is random. */
2545 if (*argrest == 'c')
2548 if (*++argrest) badarg = TRUE;
2552 if (*argrest == 'r')
2553 list_queue_option = QL_UNSORTED, argrest++;
2555 list_queue_option = QL_BASIC;
2559 /* -bp: List the contents of the mail queue, top-level only */
2563 /* -bpu: List the contents of the mail queue, top-level undelivered */
2565 else if (Ustrcmp(argrest, "u") == 0) list_queue_option |= QL_UNDELIVERED_ONLY;
2567 /* -bpa: List the contents of the mail queue, including all delivered */
2569 else if (Ustrcmp(argrest, "a") == 0) list_queue_option |= QL_PLUS_GENERATED;
2571 /* -bpi: List only message IDs */
2573 else if (Ustrcmp(argrest, "i") == 0) list_queue_option |= QL_MSGID_ONLY;
2575 /* Unknown after -bp[r] */
2581 /* -bP: List the configuration variables given as the address list.
2582 Force -v, so configuration errors get displayed. */
2585 /* -bP config: we need to setup here, because later,
2586 when list_options is checked, the config is read already */
2589 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2592 readconf_save_config(version_string);
2596 list_options = TRUE;
2597 debug_selector |= D_v;
2598 debug_file = stderr;
2602 /* -brt: Test retry configuration lookup */
2604 if (Ustrcmp(argrest, "t") == 0)
2607 test_retry_arg = i + 1;
2611 /* -brw: Test rewrite configuration */
2613 else if (Ustrcmp(argrest, "w") == 0)
2616 test_rewrite_arg = i + 1;
2622 /* -bS: Read SMTP commands on standard input, but produce no replies -
2623 all errors are reported by sending messages. */
2626 smtp_input = smtp_batched_input = receiving_message = TRUE;
2630 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2631 on standard output. */
2633 if (!*argrest) smtp_input = receiving_message = TRUE;
2637 /* -bt: address testing mode */
2640 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2644 /* -bv: verify addresses */
2647 verify_address_mode = checking = f.log_testing_mode = TRUE;
2649 /* -bvs: verify sender addresses */
2651 else if (Ustrcmp(argrest, "s") == 0)
2653 verify_address_mode = checking = f.log_testing_mode = TRUE;
2654 verify_as_sender = TRUE;
2659 /* -bV: Print version string and support details */
2663 printf("Exim version %s #%s built %s\n", version_string,
2664 version_cnumber, version_date);
2665 printf("%s\n", CS version_copyright);
2666 version_printed = TRUE;
2667 show_whats_supported(TRUE);
2668 f.log_testing_mode = TRUE;
2673 /* -bw: inetd wait mode, accept a listening socket as stdin */
2675 f.inetd_wait_mode = TRUE;
2676 f.background_daemon = FALSE;
2677 f.daemon_listen = f.daemon_scion = TRUE;
2679 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2680 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2691 /* -C: change configuration file list; ignore if it isn't really
2692 a change! Enforce a prefix check if required. */
2696 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2697 if (Ustrcmp(config_main_filelist, argrest) != 0)
2699 #ifdef ALT_CONFIG_PREFIX
2701 int len = Ustrlen(ALT_CONFIG_PREFIX);
2702 const uschar *list = argrest;
2704 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2705 while((filename = string_nextinlist(&list, &sep, big_buffer,
2707 if ( ( Ustrlen(filename) < len
2708 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2709 || Ustrstr(filename, "/../") != NULL
2711 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2713 exim_fail("-C Permission denied\n");
2715 if (real_uid != root_uid)
2717 #ifdef TRUSTED_CONFIG_LIST
2719 if (real_uid != exim_uid
2720 #ifdef CONFIGURE_OWNER
2721 && real_uid != config_uid
2724 f.trusted_config = FALSE;
2727 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2730 struct stat statbuf;
2732 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2733 (statbuf.st_uid != root_uid /* owner not root */
2734 #ifdef CONFIGURE_OWNER
2735 && statbuf.st_uid != config_uid /* owner not the special one */
2738 (statbuf.st_gid != root_gid /* group not root */
2739 #ifdef CONFIGURE_GROUP
2740 && statbuf.st_gid != config_gid /* group not the special one */
2742 && (statbuf.st_mode & 020) != 0 /* group writeable */
2744 (statbuf.st_mode & 2) != 0) /* world writeable */
2746 f.trusted_config = FALSE;
2751 /* Well, the trust list at least is up to scratch... */
2753 uschar *trusted_configs[32];
2756 int old_pool = store_pool;
2757 store_pool = POOL_MAIN;
2759 reset_point = store_mark();
2760 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2762 uschar * start = big_buffer, * nl;
2763 if (Uskip_whitespace(&start) != '/')
2765 if ((nl = Ustrchr(start, '\n')))
2767 trusted_configs[nr_configs++] = string_copy(start);
2768 if (nr_configs == nelem(trusted_configs))
2776 const uschar *list = argrest;
2778 while (f.trusted_config && (filename = string_nextinlist(&list,
2779 &sep, big_buffer, big_buffer_size)))
2781 for (i=0; i < nr_configs; i++)
2782 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2784 if (i == nr_configs)
2786 f.trusted_config = FALSE;
2791 else /* No valid prefixes found in trust_list file. */
2792 f.trusted_config = FALSE;
2793 store_reset(reset_point);
2794 store_pool = old_pool;
2797 else /* Could not open trust_list file. */
2798 f.trusted_config = FALSE;
2801 /* Not root; don't trust config */
2802 f.trusted_config = FALSE;
2806 config_main_filelist = argrest;
2807 f.config_changed = TRUE;
2812 /* -D: set up a macro definition */
2815 #ifdef DISABLE_D_OPTION
2816 exim_fail("exim: -D is not available in this Exim binary\n");
2822 const uschar * s = argrest;
2825 Uskip_whitespace(&s);
2827 if (*s < 'A' || *s > 'Z')
2828 exim_fail("exim: macro name set by -D must start with "
2829 "an upper case letter\n");
2831 while (isalnum(*s) || *s == '_')
2833 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2837 if (ptr == 0) { badarg = TRUE; break; }
2838 if (Uskip_whitespace(&s))
2840 if (*s++ != '=') { badarg = TRUE; break; }
2841 Uskip_whitespace(&s);
2844 for (m = macros_user; m; m = m->next)
2845 if (Ustrcmp(m->name, name) == 0)
2846 exim_fail("exim: duplicated -D in command line\n");
2848 m = macro_create(name, s, TRUE);
2850 if (clmacro_count >= MAX_CLMACROS)
2851 exim_fail("exim: too many -D options on command line\n");
2852 clmacros[clmacro_count++] =
2853 string_sprintf("-D%s=%s", m->name, m->replacement);
2860 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2862 if (Ustrcmp(argrest, "ropcr") == 0)
2864 /* drop_cr = TRUE; */
2867 /* -dp: Set up a debug pretrigger buffer with given size. */
2869 else if (Ustrcmp(argrest, "p") == 0)
2873 debug_pretrigger_setup(argv[i]);
2875 /* -dt: Set a debug trigger selector */
2877 else if (Ustrncmp(argrest, "t=", 2) == 0)
2878 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2880 /* -d: Set debug level (see also -v below).
2881 If -dd is used, debugging subprocesses of the daemon is disabled. */
2885 /* Use an intermediate variable so that we don't set debugging while
2886 decoding the debugging bits. */
2888 unsigned int selector = D_default;
2891 if (*argrest == 'd')
2893 f.debug_daemon = TRUE;
2897 decode_bits(&selector, 1, debug_notall, argrest,
2898 debug_options, debug_options_count, US"debug", 0);
2899 debug_selector = selector;
2904 /* -E: This is a local error message. This option is not intended for
2905 external use at all, but is not restricted to trusted callers because it
2906 does no harm (just suppresses certain error messages) and if Exim is run
2907 not setuid root it won't always be trusted when it generates error
2908 messages using this option. If there is a message id following -E, point
2909 message_reference at it, for logging. */
2912 f.local_error_message = TRUE;
2913 if (mac_ismsgid(argrest)) message_reference = argrest;
2917 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2918 option, so it looks as if historically the -oex options are also callable
2919 without the leading -o. So we have to accept them. Before the switch,
2920 anything starting -oe has been converted to -e. Exim does not support all
2921 of the sendmail error options. */
2924 if (Ustrcmp(argrest, "e") == 0)
2926 arg_error_handling = ERRORS_SENDER;
2927 errors_sender_rc = EXIT_SUCCESS;
2929 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2930 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2931 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2932 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2937 /* -F: Set sender's full name, used instead of the gecos entry from
2938 the password file. Since users can usually alter their gecos entries,
2939 there's no security involved in using this instead. The data can follow
2940 the -F or be in the next argument. */
2944 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2945 originator_name = string_copy_taint(
2946 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2948 f.sender_name_forced = TRUE;
2952 /* -f: Set sender's address - this value is only actually used if Exim is
2953 run by a trusted user, or if untrusted_set_sender is set and matches the
2954 address, except that the null address can always be set by any user. The
2955 test for this happens later, when the value given here is ignored when not
2956 permitted. For an untrusted user, the actual sender is still put in Sender:
2957 if it doesn't match the From: header (unless no_local_from_check is set).
2958 The data can follow the -f or be in the next argument. The -r switch is an
2959 obsolete form of -f but since there appear to be programs out there that
2960 use anything that sendmail has ever supported, better accept it - the
2961 synonymizing is done before the switch above.
2963 At this stage, we must allow domain literal addresses, because we don't
2964 know what the setting of allow_domain_literals is yet. Ditto for trailing
2965 dots and strip_trailing_dot. */
2969 int dummy_start, dummy_end;
2972 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2973 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2976 uschar * s = store_get(1, GET_UNTAINTED); /* Ensure writeable memory */
2982 const uschar * temp = argrest + Ustrlen(argrest) - 1;
2983 while (temp >= argrest && isspace(*temp)) temp--;
2984 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2985 allow_domain_literals = TRUE;
2986 strip_trailing_dot = TRUE;
2988 allow_utf8_domains = TRUE;
2990 if (!(sender_address = parse_extract_address(argrest, &errmess,
2991 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2992 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2994 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2996 message_smtputf8 = string_is_utf8(sender_address);
2997 allow_utf8_domains = FALSE;
2999 allow_domain_literals = FALSE;
3000 strip_trailing_dot = FALSE;
3002 f.sender_address_forced = TRUE;
3006 /* -G: sendmail invocation to specify that it's a gateway submission and
3007 sendmail may complain about problems instead of fixing them.
3008 We make it equivalent to an ACL "control = suppress_local_fixups" and do
3009 not at this time complain about problems. */
3015 /* -h: Set the hop count for an incoming message. Exim does not currently
3016 support this; it always computes it by counting the Received: headers.
3017 To put it in will require a change to the spool header file format. */
3021 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3022 if (!isdigit(*argrest)) badarg = TRUE;
3026 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
3027 not to be documented for sendmail but mailx (at least) uses it) */
3030 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
3034 /* -L: set the identifier used for syslog; equivalent to setting
3035 syslog_processname in the config file, but needs to be an admin option. */
3039 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3040 if ((sz = Ustrlen(argrest)) > 32)
3041 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
3043 exim_fail("exim: the -L syslog name is too short\n");
3044 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
3048 receiving_message = FALSE;
3050 /* -MC: continue delivery of another message via an existing open
3051 file descriptor. This option is used for an internal call by the
3052 smtp transport when there is a pending message waiting to go to an
3053 address to which it has got a connection. Five subsequent arguments are
3054 required: transport name, host name, IP address, sequence number, and
3055 message_id. Transports may decline to create new processes if the sequence
3056 number gets too big. The channel is stdin. This (-MC) must be the last
3057 argument. There's a subsequent check that the real-uid is privileged.
3059 If we are running in the test harness. delay for a bit, to let the process
3060 that set this one up complete. This makes for repeatability of the logging,
3063 if (Ustrcmp(argrest, "C") == 0)
3065 union sockaddr_46 interface_sock;
3066 EXIM_SOCKLEN_T size = sizeof(interface_sock);
3069 exim_fail("exim: too many or too few arguments after -MC\n");
3071 if (msg_action_arg >= 0)
3072 exim_fail("exim: incompatible arguments\n");
3074 continue_transport = string_copy_taint(
3075 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
3077 continue_hostname = string_copy_taint(
3078 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
3080 continue_host_address = string_copy_taint(
3081 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
3083 continue_sequence = Uatoi(argv[++i]);
3084 msg_action = MSG_DELIVER;
3085 msg_action_arg = ++i;
3086 forced_delivery = TRUE;
3087 queue_run_pid = passed_qr_pid;
3088 queue_run_pipe = passed_qr_pipe;
3090 if (!mac_ismsgid(argv[i]))
3091 exim_fail("exim: malformed message id %s after -MC option\n",
3094 /* Set up $sending_ip_address and $sending_port, unless proxied */
3096 if (!continue_proxy_cipher)
3097 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
3099 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
3102 exim_fail("exim: getsockname() failed after -MC option: %s\n",
3105 testharness_pause_ms(500);
3109 else if (*argrest == 'C' && argrest[1] && !argrest[2])
3113 /* -MCA: set the smtp_authenticated flag; this is useful only when it
3114 precedes -MC (see above). The flag indicates that the host to which
3115 Exim is connected has accepted an AUTH sequence. */
3117 case 'A': f.smtp_authenticated = TRUE; break;
3119 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
3120 that exim is connected to supports the esmtp extension DSN */
3122 case 'D': smtp_peer_options |= OPTION_DSN; break;
3124 /* -MCd: for debug, set a process-purpose string */
3126 case 'd': if (++i < argc)
3127 process_purpose = string_copy_taint(
3128 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
3133 /* -MCG: set the queue name, to a non-default value. Arguably, anything
3134 from the commandline should be tainted - but we will need an untainted
3135 value for the spoolfile when doing a -odi delivery process. */
3137 case 'G': if (++i < argc) queue_name = string_copy_taint(
3138 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
3143 /* -MCK: the peer offered CHUNKING. Must precede -MC */
3145 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
3147 #ifndef DISABLE_ESMTP_LIMITS
3148 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
3149 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
3151 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
3153 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
3158 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
3159 it preceded -MC (see above) */
3161 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3163 #ifdef SUPPORT_SOCKS
3164 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3165 case 'p': proxy_session = TRUE;
3168 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3171 proxy_local_port = Uatoi(argv[i]);
3174 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3177 proxy_external_port = Uatoi(argv[i]);
3183 /* -MCQ: pass on the pid of the queue-running process that started
3184 this chain of deliveries and the fd of its synchronizing pipe; this
3185 is useful only when it precedes -MC (see above) */
3187 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3189 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3193 /* -MCq: do a quota check on the given recipient for the given size
3194 of message. Separate from -MC. */
3195 case 'q': rcpt_verify_quota = TRUE;
3196 if (++i < argc) message_size = Uatoi(argv[i]);
3200 /* -MCS: set the smtp_use_size flag; this is useful only when it
3201 precedes -MC (see above) */
3203 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3206 /* -MCs: used with -MCt; SNI was sent */
3207 /* -MCr: ditto, DANE */
3210 case 's': if (++i < argc)
3212 continue_proxy_sni = string_copy_taint(
3213 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3215 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3220 /* -MCt: similar to -MCT below but the connection is still open
3221 via a proxy process which handles the TLS context and coding.
3222 Require three arguments for the proxied local address and port,
3223 and the TLS cipher. */
3225 case 't': if (++i < argc)
3226 sending_ip_address = string_copy_taint(
3227 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3231 sending_port = (int)(Uatol(argv[i]));
3234 continue_proxy_cipher = string_copy_taint(
3235 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3240 /* -MCT: set the tls_offered flag; this is useful only when it
3241 precedes -MC (see above). The flag indicates that the host to which
3242 Exim is connected has offered TLS support. */
3244 case 'T': smtp_peer_options |= OPTION_TLS; break;
3247 default: badarg = TRUE; break;
3252 /* -M[x]: various operations on the following list of message ids:
3253 -M deliver the messages, ignoring next retry times and thawing
3254 -Mc deliver the messages, checking next retry times, no thawing
3255 -Mf freeze the messages
3256 -Mg give up on the messages
3257 -Mt thaw the messages
3258 -Mrm remove the messages
3259 In the above cases, this must be the last option. There are also the
3260 following options which are followed by a single message id, and which
3261 act on that message. Some of them use the "recipient" addresses as well.
3262 -Mar add recipient(s)
3263 -MG move to a different queue
3264 -Mmad mark all recipients delivered
3265 -Mmd mark recipients(s) delivered
3267 -Mset load a message for use with -be
3269 -Mvc show copy (of whole message, in RFC 2822 format)
3276 msg_action = MSG_DELIVER;
3277 forced_delivery = f.deliver_force_thaw = TRUE;
3279 else if (Ustrcmp(argrest, "ar") == 0)
3281 msg_action = MSG_ADD_RECIPIENT;
3282 one_msg_action = TRUE;
3284 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3285 else if (Ustrcmp(argrest, "es") == 0)
3287 msg_action = MSG_EDIT_SENDER;
3288 one_msg_action = TRUE;
3290 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3291 else if (Ustrcmp(argrest, "g") == 0)
3293 msg_action = MSG_DELIVER;
3294 deliver_give_up = TRUE;
3296 else if (Ustrcmp(argrest, "G") == 0)
3298 msg_action = MSG_SETQUEUE;
3299 queue_name_dest = string_copy_taint(
3300 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3301 EXIM_DRIVERNAME_MAX, "-MG"),
3304 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3305 else if (Ustrcmp(argrest, "md") == 0)
3307 msg_action = MSG_MARK_DELIVERED;
3308 one_msg_action = TRUE;
3310 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3311 else if (Ustrcmp(argrest, "set") == 0)
3313 msg_action = MSG_LOAD;
3314 one_msg_action = TRUE;
3316 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3317 else if (Ustrcmp(argrest, "vb") == 0)
3319 msg_action = MSG_SHOW_BODY;
3320 one_msg_action = TRUE;
3322 else if (Ustrcmp(argrest, "vc") == 0)
3324 msg_action = MSG_SHOW_COPY;
3325 one_msg_action = TRUE;
3327 else if (Ustrcmp(argrest, "vh") == 0)
3329 msg_action = MSG_SHOW_HEADER;
3330 one_msg_action = TRUE;
3332 else if (Ustrcmp(argrest, "vl") == 0)
3334 msg_action = MSG_SHOW_LOG;
3335 one_msg_action = TRUE;
3337 else { badarg = TRUE; break; }
3339 /* All the -Mxx options require at least one message id. */
3341 msg_action_arg = i + 1;
3342 if (msg_action_arg >= argc)
3343 exim_fail("exim: no message ids given after %s option\n", arg);
3345 /* Some require only message ids to follow */
3347 if (!one_msg_action)
3349 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3350 exim_fail("exim: malformed message id %s after %s option\n",
3352 goto END_ARG; /* Remaining args are ids */
3355 /* Others require only one message id, possibly followed by addresses,
3356 which will be handled as normal arguments. */
3360 if (!mac_ismsgid(argv[msg_action_arg]))
3361 exim_fail("exim: malformed message id %s after %s option\n",
3362 argv[msg_action_arg], arg);
3368 /* Some programs seem to call the -om option without the leading o;
3369 for sendmail it askes for "me too". Exim always does this. */
3372 if (*argrest) badarg = TRUE;
3376 /* -N: don't do delivery - a debugging option that stops transports doing
3377 their thing. It implies debugging at the D_v level. */
3382 f.dont_deliver = TRUE;
3383 debug_selector |= D_v;
3384 debug_file = stderr;
3390 /* -n: This means "don't alias" in sendmail, apparently.
3391 For normal invocations, it has no effect.
3392 It may affect some other options. */
3398 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3399 option to the specified value. This form uses long names. We need to handle
3400 -O option=value and -Ooption=value. */
3405 exim_fail("exim: string expected after -O\n");
3411 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3414 if (!*(alias_arg = argrest))
3415 if (i+1 < argc) alias_arg = argv[++i];
3416 else exim_fail("exim: string expected after -oA\n");
3419 /* -oB: Set a connection message max value for remote deliveries */
3422 const uschar * p = argrest;
3424 if (i+1 < argc && isdigit((argv[i+1][0])))
3428 connection_max_messages = 1;
3435 exim_fail("exim: number expected after -oB\n");
3436 connection_max_messages = Uatoi(p);
3441 /* -odb: background delivery */
3444 if (Ustrcmp(argrest, "b") == 0)
3446 f.synchronous_delivery = FALSE;
3447 arg_queue_only = FALSE;
3448 queue_only_set = TRUE;
3451 /* -odd: testsuite-only: add no inter-process delays */
3453 else if (Ustrcmp(argrest, "d") == 0)
3454 f.testsuite_delays = FALSE;
3456 /* -odf: foreground delivery (smail-compatible option); same effect as
3457 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3460 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3462 f.synchronous_delivery = TRUE;
3463 arg_queue_only = FALSE;
3464 queue_only_set = TRUE;
3467 /* -odq: queue only */
3469 else if (Ustrcmp(argrest, "q") == 0)
3471 f.synchronous_delivery = FALSE;
3472 arg_queue_only = TRUE;
3473 queue_only_set = TRUE;
3476 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3477 but no remote delivery */
3479 else if (Ustrcmp(argrest, "qs") == 0)
3481 f.queue_smtp = TRUE;
3482 arg_queue_only = FALSE;
3483 queue_only_set = TRUE;
3488 /* -oex: Sendmail error flags. As these are also accepted without the
3489 leading -o prefix, for compatibility with vacation and other callers,
3490 they are handled with -e above. */
3492 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3493 -oitrue: Another sendmail syntax for the same */
3496 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3501 /* -oM*: Set various characteristics for an incoming message; actually
3502 acted on for trusted callers only. */
3507 exim_fail("exim: data expected after -oM%s\n", argrest);
3509 /* -oMa: Set sender host address */
3511 if (Ustrcmp(argrest, "a") == 0)
3512 sender_host_address = string_copy_taint(
3513 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3514 EXIM_IPADDR_MAX, "-oMa"), GET_TAINTED);
3516 /* -oMaa: Set authenticator name */
3518 else if (Ustrcmp(argrest, "aa") == 0)
3519 sender_host_authenticated = string_copy_taint(
3520 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3521 EXIM_DRIVERNAME_MAX, "-oMaa"), GET_TAINTED);
3523 /* -oMas: setting authenticated sender */
3525 else if (Ustrcmp(argrest, "as") == 0)
3526 authenticated_sender = string_copy_taint(
3527 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3528 EXIM_EMAILADDR_MAX, "-oMas"), GET_TAINTED);
3530 /* -oMai: setting authenticated id */
3532 else if (Ustrcmp(argrest, "ai") == 0)
3533 authenticated_id = string_copy_taint(
3534 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3535 EXIM_EMAILADDR_MAX, "-oMai"), GET_TAINTED);
3537 /* -oMi: Set incoming interface address */
3539 else if (Ustrcmp(argrest, "i") == 0)
3540 interface_address = string_copy_taint(
3541 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3542 EXIM_IPADDR_MAX, "-oMi"), GET_TAINTED);
3544 /* -oMm: Message reference */
3546 else if (Ustrcmp(argrest, "m") == 0)
3548 if (!mac_ismsgid(argv[i+1]))
3549 exim_fail("-oMm must be a valid message ID\n");
3550 if (!f.trusted_config)
3551 exim_fail("-oMm must be called by a trusted user/config\n");
3552 message_reference = next_argv(argv, &i, argc, arg);
3555 /* -oMr: Received protocol */
3557 else if (Ustrcmp(argrest, "r") == 0)
3559 if (received_protocol)
3560 exim_fail("received_protocol is set already\n");
3562 if (++i >= argc) badarg = TRUE;
3564 received_protocol = string_copy_taint(
3565 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-oMr"),
3568 /* -oMs: Set sender host name */
3570 else if (Ustrcmp(argrest, "s") == 0)
3571 if (++i >= argc) badarg = TRUE;
3573 sender_host_name = string_copy_taint(
3574 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-oMs"),
3577 /* -oMt: Set sender ident */
3579 else if (Ustrcmp(argrest, "t") == 0)
3580 if (++i >= argc) badarg = TRUE;
3583 sender_ident_set = TRUE;
3584 sender_ident = string_copy_taint(
3585 exim_str_fail_toolong(argv[i], EXIM_IDENTUSER_MAX, "-oMt"),
3589 /* Else a bad argument */
3596 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3597 seem to call this as -m (undocumented), so that is also accepted (see
3599 /* -oo: An ancient flag for old-style addresses which still seems to
3600 crop up in some calls (see in SCO). */
3604 if (*argrest) badarg = TRUE;
3607 /* -oP <name>: set pid file path for daemon
3608 -oPX: delete pid file of daemon */
3611 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3612 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3613 "(uid=%d euid=%d | %d)\n",
3614 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3616 if (++i < argc) override_pid_file_path = argv[i];
3618 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3623 /* -or <n>: set timeout for non-SMTP acceptance
3624 -os <n>: set timeout for SMTP acceptance */
3629 int * tp = argrest[-1] == 'r'
3630 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3632 *tp = readconf_readtime(argrest, 0, FALSE);
3633 else if (i+1 < argc)
3634 *tp = readconf_readtime(argv[++i], 0, FALSE);
3637 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3641 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3642 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3645 if (*argrest || ++i >= argc) badarg = TRUE;
3646 else override_local_interfaces = string_copy_taint(
3647 exim_str_fail_toolong(argv[i], 1024, "-oX"), GET_TAINTED);
3650 /* -oY: Override creation of daemon notifier socket */
3653 if (*argrest) badarg = TRUE;
3654 else f.notifier_socket_en = FALSE;
3657 /* Unknown -o argument */
3665 /* -ps: force Perl startup; -pd force delayed Perl startup */
3669 if (*argrest == 's' && argrest[1] == 0)
3671 perl_start_option = 1;
3674 if (*argrest == 'd' && argrest[1] == 0)
3676 perl_start_option = -1;
3681 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3682 which sets the host protocol and host name */
3685 argrest = next_argv(argv, &i, argc, arg);
3689 uschar * hn = Ustrchr(argrest, ':');
3691 if (received_protocol)
3692 exim_fail("received_protocol is set already\n");
3695 received_protocol = string_copy_taint(
3696 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3700 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3701 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3702 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3707 /* -q: set up queue runs */
3711 BOOL two_stage, first_del, force, thaw = FALSE, local;
3713 receiving_message = FALSE;
3715 /* -qq...: Do queue runs in a 2-stage manner */
3717 if ((two_stage = *argrest == 'q'))
3720 /* -qi...: Do only first (initial) deliveries */
3722 if ((first_del = *argrest == 'i'))
3725 /* -qf...: Run the queue, forcing deliveries
3726 -qff..: Ditto, forcing thawing as well */
3728 if ((force = *argrest == 'f'))
3729 if ((thaw = *++argrest == 'f'))
3732 /* -q[f][f]l...: Run the queue only on local deliveries */
3734 if ((local = *argrest == 'l'))
3737 /* -q[f][f][l][G<name>]... Work on the named queue */
3739 if (*argrest == 'G')
3742 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3743 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3744 queue_name = string_copyn(argrest, i);
3746 if (*argrest == '/') argrest++;
3749 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3750 only, optionally named, optionally starting from a given message id. */
3752 if (!(list_queue || count_queue))
3757 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3759 q = alloc_onetime_qrunner();
3760 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3761 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3762 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3763 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3766 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3767 forced, optionally local only, optionally named. */
3774 if (*argrest) s = argrest;
3775 else if (++i < argc) { badarg = TRUE; break; }
3778 if ((intvl = readconf_readtime(s, 0, FALSE)) <= 0)
3779 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3781 for (qrunner * qq = qrunners; qq; qq = qq->next)
3782 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3783 || !queue_name && !qq->name)
3784 exim_fail("exim: queue-runner specified more than once\n");
3786 q = alloc_qrunner();
3787 q->interval = intvl;
3790 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3791 q->queue_run_force = force;
3792 q->deliver_force_thaw = thaw;
3793 q->queue_run_first_delivery = first_del;
3794 q->queue_run_local = local;
3795 q->queue_2stage = two_stage;
3802 case 'R': /* Synonymous with -qR... */
3803 case 'S': /* Synonymous with -qS... */
3805 const uschar * tainted_selectstr;
3808 receiving_message = FALSE;
3810 /* -Rf: As -R (below) but force all deliveries,
3811 -Rff: Ditto, but also thaw all frozen messages,
3812 -Rr: String is regex
3813 -Rrf: Regex and force
3814 -Rrff: Regex and force and thaw
3816 -S...: Like -R but works on sender.
3818 in all cases provided there are no further characters in this
3821 if (!qrunners) alloc_onetime_qrunner();
3822 qrunners->queue_2stage = f.queue_2stage;
3824 for (int i = 0; i < nelem(rsopts); i++)
3825 if (Ustrcmp(argrest, rsopts[i]) == 0)
3827 if (i != 2) qrunners->queue_run_force = TRUE;
3829 if (switchchar == 'R')
3830 f.deliver_selectstring_regex = TRUE;
3832 f.deliver_selectstring_sender_regex = TRUE;
3833 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3834 argrest += Ustrlen(rsopts[i]);
3837 /* -R or -S: Set string to match in addresses for forced queue run to
3838 pick out particular messages. */
3840 /* Avoid attacks from people providing very long strings, and do so before
3843 tainted_selectstr = argrest;
3844 else if (i+1 < argc)
3845 tainted_selectstr = argv[++i];
3847 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3849 s = string_copy_taint(
3850 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3853 if (switchchar == 'R')
3854 deliver_selectstring = s;
3856 deliver_selectstring_sender = s;
3861 /* -r: an obsolete synonym for -f (see above) */
3863 /* -Tqt is an option that is exclusively for use by the testing suite.
3864 It is not recognized in other circumstances. It allows for the setting up
3865 of explicit "queue times" so that various warning/retry things can be
3866 tested. Otherwise variability of clock ticks etc. cause problems. */
3869 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0 && ++i < argc)
3870 fudged_queue_times = string_copy_taint(argv[i], GET_TAINTED);
3875 /* -t: Set flag to extract recipients from body of message. */
3878 if (!*argrest) extract_recipients = TRUE;
3880 /* -ti: Set flag to extract recipients from body of message, and also
3881 specify that dot does not end the message. */
3883 else if (Ustrcmp(argrest, "i") == 0)
3885 extract_recipients = TRUE;
3889 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3892 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3899 /* -U: This means "initial user submission" in sendmail, apparently. The
3900 doc claims that in future sendmail may refuse syntactically invalid
3901 messages instead of fixing them. For the moment, we just ignore it. */
3907 /* -v: verify things - this is a very low-level debugging */
3912 debug_selector |= D_v;
3913 debug_file = stderr;
3919 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3921 The -x flag tells the sendmail command that mail from a local
3922 mail program has National Language Support (NLS) extended characters
3923 in the body of the mail item. The sendmail command can send mail with
3924 extended NLS characters across networks that normally corrupts these
3927 As Exim is 8-bit clean, it just ignores this flag. */
3930 if (*argrest) badarg = TRUE;
3933 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3934 logs to that file. We swallow the parameter and otherwise ignore it. */
3939 exim_fail("exim: string expected after -X\n");
3942 /* -z: a line of text to log */
3947 log_oneline = string_copy_taint(
3948 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3951 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3954 /* All other initial characters are errors */
3959 } /* End of high-level switch statement */
3961 /* Failed to recognize the option, or syntax error */
3964 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3965 "option %s\n", arg);
3969 /* If -R or -S have been specified without -q, assume a single queue run. */
3971 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3972 alloc_onetime_qrunner();
3976 store_pool = old_pool;
3979 /* If usage_wanted is set we call the usage function - which never returns */
3980 if (usage_wanted) exim_usage(called_as);
3982 /* Arguments have been processed. Check for incompatibilities. */
3983 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3984 && ( f.daemon_listen || qrunners || bi_option
3985 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3986 || filter_test != FTEST_NONE
3987 || msg_action_arg > 0 && !one_msg_action
3989 || ( msg_action_arg > 0
3990 && ( f.daemon_listen || is_multiple_qrun() || list_options
3991 || checking && msg_action != MSG_LOAD
3992 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3994 || ( (f.daemon_listen || is_multiple_qrun())
3995 && ( sender_address || list_options || list_queue || checking
3998 || f.daemon_listen && is_onetime_qrun()
3999 || f.inetd_wait_mode && qrunners
4001 && ( checking || smtp_input || extract_recipients
4002 || filter_test != FTEST_NONE || bi_option
4004 || ( verify_address_mode
4005 && ( f.address_test_mode || smtp_input || extract_recipients
4006 || filter_test != FTEST_NONE || bi_option
4008 || ( f.address_test_mode
4009 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
4013 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
4015 || deliver_selectstring && !qrunners
4016 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
4018 exim_fail("exim: incompatible command-line options or arguments\n");
4020 /* If debugging is set up, set the file and the file descriptor to pass on to
4021 child processes. It should, of course, be 2 for stderr. Also, force the daemon
4022 to run in the foreground. */
4024 if (debug_selector != 0)
4026 debug_file = stderr;
4027 debug_fd = fileno(debug_file);
4028 f.background_daemon = FALSE;
4029 testharness_pause_ms(100); /* lets caller finish */
4030 if (debug_selector != D_v) /* -v only doesn't show this */
4032 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
4033 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
4035 if (!version_printed)
4036 show_whats_supported(FALSE);
4040 /* When started with root privilege, ensure that the limits on the number of
4041 open files and the number of processes (where that is accessible) are
4042 sufficiently large, or are unset, in case Exim has been called from an
4043 environment where the limits are screwed down. Not all OS have the ability to
4044 change some of these limits. */
4048 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
4054 #ifdef RLIMIT_NOFILE
4055 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
4057 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
4059 rlp.rlim_cur = rlp.rlim_max = 0;
4062 /* I originally chose 1000 as a nice big number that was unlikely to
4063 be exceeded. It turns out that some older OS have a fixed upper limit of
4066 if (rlp.rlim_cur < 1000)
4068 rlp.rlim_cur = rlp.rlim_max = 1000;
4069 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4071 rlp.rlim_cur = rlp.rlim_max = 256;
4072 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4073 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
4080 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
4082 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
4084 rlp.rlim_cur = rlp.rlim_max = 0;
4087 # ifdef RLIM_INFINITY
4088 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
4090 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
4092 if (rlp.rlim_cur < 1000)
4094 rlp.rlim_cur = rlp.rlim_max = 1000;
4096 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
4097 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
4103 /* Exim is normally entered as root (but some special configurations are
4104 possible that don't do this). However, it always spins off sub-processes that
4105 set their uid and gid as required for local delivery. We don't want to pass on
4106 any extra groups that root may belong to, so we want to get rid of them all at
4109 We need to obey setgroups() at this stage, before possibly giving up root
4110 privilege for a changed configuration file, but later on we might need to
4111 check on the additional groups for the admin user privilege - can't do that
4112 till after reading the config, which might specify the exim gid. Therefore,
4113 save the group list here first. */
4115 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
4116 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
4118 /* There is a fundamental difference in some BSD systems in the matter of
4119 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
4120 known not to be different. On the "different" systems there is a single group
4121 list, and the first entry in it is the current group. On all other versions of
4122 Unix there is a supplementary group list, which is in *addition* to the current
4123 group. Consequently, to get rid of all extraneous groups on a "standard" system
4124 you pass over 0 groups to setgroups(), while on a "different" system you pass
4125 over a single group - the current group, which is always the first group in the
4126 list. Calling setgroups() with zero groups on a "different" system results in
4127 an error return. The following code should cope with both types of system.
4129 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
4130 the "setgroups() with zero groups" - and changes the egid.
4131 Thanks to that we had to stash the original_egid above, for use below
4132 in the call to exim_setugid().
4134 However, if this process isn't running as root, setgroups() can't be used
4135 since you have to be root to run it, even if throwing away groups.
4136 Except, sigh, for Hurd - where you can.
4137 Not being root here happens only in some unusual configurations. */
4140 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
4141 && setgroups(0, NULL) != 0
4143 && setgroups(1, group_list) != 0)
4144 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
4146 /* If the configuration file name has been altered by an argument on the
4147 command line (either a new file name or a macro definition) and the caller is
4148 not root, or if this is a filter testing run, remove any setuid privilege the
4149 program has and run as the underlying user.
4151 The exim user is locked out of this, which severely restricts the use of -C
4154 Otherwise, set the real ids to the effective values (should be root unless run
4155 from inetd, which it can either be root or the exim uid, if one is configured).
4157 There is a private mechanism for bypassing some of this, in order to make it
4158 possible to test lots of configurations automatically, without having either to
4159 recompile each time, or to patch in an actual configuration file name and other
4160 values (such as the path name). If running in the test harness, pretend that
4161 configuration file changes and macro definitions haven't happened. */
4164 (!f.trusted_config || /* Config changed, or */
4165 !macros_trusted(opt_D_used)) && /* impermissible macros and */
4166 real_uid != root_uid && /* Not root, and */
4167 !f.running_in_test_harness /* Not fudged */
4169 expansion_test /* expansion testing */
4171 filter_test != FTEST_NONE) /* Filter testing */
4173 setgroups(group_count, group_list);
4174 exim_setugid(real_uid, real_gid, FALSE,
4175 US"-C, -D, -be or -bf forces real uid");
4176 removed_privilege = TRUE;
4178 /* In the normal case when Exim is called like this, stderr is available
4179 and should be used for any logging information because attempts to write
4180 to the log will usually fail. To arrange this, we unset really_exim. However,
4181 if no stderr is available there is no point - we might as well have a go
4182 at the log (if it fails, syslog will be written).
4184 Note that if the invoker is Exim, the logs remain available. Messing with
4185 this causes unlogged successful deliveries. */
4187 if (log_stderr && real_uid != exim_uid)
4188 f.really_exim = FALSE;
4191 /* Privilege is to be retained for the moment. It may be dropped later,
4192 depending on the job that this Exim process has been asked to do. For now, set
4193 the real uid to the effective so that subsequent re-execs of Exim are done by a
4197 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4199 /* If testing a filter, open the file(s) now, before wasting time doing other
4200 setups and reading the message. */
4202 if (filter_test & FTEST_SYSTEM)
4203 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4204 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4207 if (filter_test & FTEST_USER)
4208 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4209 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4212 /* Initialise lookup_list
4213 If debugging, already called above via version reporting.
4214 In either case, we initialise the list of available lookups while running
4215 as root. All dynamically modules are loaded from a directory which is
4216 hard-coded into the binary and is code which, if not a module, would be
4217 part of Exim already. Ability to modify the content of the directory
4218 is equivalent to the ability to modify a setuid binary!
4220 This needs to happen before we read the main configuration. */
4222 init_misc_mod_list();
4224 /*XXX this excrescence could move to the testsuite standard config setup file */
4226 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4229 /* Read the main runtime configuration data; this gives up if there
4230 is a failure. It leaves the configuration file open so that the subsequent
4231 configuration data for delivery can be read if needed.
4233 NOTE: immediately after opening the configuration file we change the working
4234 directory to "/"! Later we change to $spool_directory. We do it there, because
4235 during readconf_main() some expansion takes place already. */
4237 /* Store the initial cwd before we change directories. Can be NULL if the
4238 dir has already been unlinked. */
4239 initial_cwd = os_getcwd(NULL, 0);
4240 if (!initial_cwd && errno)
4241 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4243 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4244 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4247 -be[m] expansion test -
4248 -b[fF] filter test new
4250 -bmalware malware_test_file new
4252 -brw rewrite test new
4254 -bv[s] address verify -
4256 -bP <option> (except -bP config, which sets list_config)
4258 If any of these options is set, we suppress warnings about configuration
4259 issues (currently about tls_advertise_hosts and keep_environment not being
4263 int old_pool = store_pool;
4264 #ifdef MEASURE_TIMING
4266 (void)gettimeofday(&t0, NULL);
4269 store_pool = POOL_CONFIG;
4270 readconf_main(checking || list_options);
4271 store_pool = old_pool;
4273 #ifdef MEASURE_TIMING
4274 report_time_since(&t0, US"readconf_main (delta)");
4278 /* Now in directory "/" */
4280 if (cleanup_environment() == FALSE)
4281 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4284 /* If an action on specific messages is requested, or if a daemon or queue
4285 runner is being started, we need to know if Exim was called by an admin user.
4286 This is the case if the real user is root or exim, or if the real group is
4287 exim, or if one of the supplementary groups is exim or a group listed in
4288 admin_groups. We don't fail all message actions immediately if not admin_user,
4289 since some actions can be performed by non-admin users. Instead, set admin_user
4290 for later interrogation. */
4292 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4293 f.admin_user = TRUE;
4295 for (int i = 0; i < group_count && !f.admin_user; i++)
4296 if (group_list[i] == exim_gid)
4297 f.admin_user = TRUE;
4298 else if (admin_groups)
4299 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4300 if (admin_groups[j] == group_list[i])
4301 f.admin_user = TRUE;
4303 /* Another group of privileged users are the trusted users. These are root,
4304 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4305 are permitted to specify sender_addresses with -f on the command line, and
4306 other message parameters as well. */
4308 if (real_uid == root_uid || real_uid == exim_uid)
4309 f.trusted_caller = TRUE;
4313 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4314 if (trusted_users[i] == real_uid)
4315 f.trusted_caller = TRUE;
4318 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4319 if (trusted_groups[i] == real_gid)
4320 f.trusted_caller = TRUE;
4321 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4322 if (trusted_groups[i] == group_list[j])
4323 f.trusted_caller = TRUE;
4326 /* At this point, we know if the user is privileged and some command-line
4327 options become possibly impermissible, depending upon the configuration file. */
4329 if (checking && commandline_checks_require_admin && !f.admin_user)
4330 exim_fail("exim: those command-line flags are set to require admin\n");
4332 /* Handle the decoding of logging options. */
4334 decode_bits(log_selector, log_selector_size, log_notall,
4335 log_selector_string, log_options, log_options_count, US"log", 0);
4339 debug_printf("configuration file is %s\n", config_main_filename);
4340 debug_printf("log selectors =");
4341 for (int i = 0; i < log_selector_size; i++)
4342 debug_printf(" %08x", log_selector[i]);
4346 /* If domain literals are not allowed, check the sender address that was
4347 supplied with -f. Ditto for a stripped trailing dot. */
4351 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4352 exim_fail("exim: bad -f address \"%s\": domain literals not "
4353 "allowed\n", sender_address);
4354 if (f_end_dot && !strip_trailing_dot)
4355 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4356 "(trailing dot not allowed)\n", sender_address);
4359 /* See if an admin user overrode our logging. */
4361 if (cmdline_syslog_name)
4364 syslog_processname = cmdline_syslog_name;
4365 log_file_path = string_copy(CUS"syslog");
4368 /* not a panic, non-privileged users should not be able to spam paniclog */
4370 "exim: you lack sufficient privilege to specify syslog process name\n");
4372 /* Paranoia check of maximum lengths of certain strings. There is a check
4373 on the length of the log file path in log.c, which will come into effect
4374 if there are any calls to write the log earlier than this. However, if we
4375 get this far but the string is very long, it is better to stop now than to
4376 carry on and (e.g.) receive a message and then have to collapse. The call to
4377 log_write() from here will cause the ultimate panic collapse if the complete
4378 file name exceeds the buffer length. */
4380 if (Ustrlen(log_file_path) > 200)
4381 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4382 "log_file_path is longer than 200 chars: aborting");
4384 if (Ustrlen(pid_file_path) > 200)
4385 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4386 "pid_file_path is longer than 200 chars: aborting");
4388 if (Ustrlen(spool_directory) > 200)
4389 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4390 "spool_directory is longer than 200 chars: aborting");
4392 /* Length check on the process name given to syslog for its TAG field,
4393 which is only permitted to be 32 characters or less. See RFC 3164. */
4395 if (Ustrlen(syslog_processname) > 32)
4396 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4397 "syslog_processname is longer than 32 chars: aborting");
4402 log_write(0, LOG_MAIN, "%s", log_oneline);
4403 return EXIT_SUCCESS;
4406 return EXIT_FAILURE;
4408 /* In some operating systems, the environment variable TMPDIR controls where
4409 temporary files are created; Exim doesn't use these (apart from when delivering
4410 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4411 If TMPDIR is found in the environment, reset it to the value defined in the
4412 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4413 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4414 EXIM_TMPDIR by the build scripts.
4418 if (environ) for (uschar ** p = USS environ; *p; p++)
4419 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4421 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4422 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4424 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4428 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4429 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4430 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4431 called by a user who has set the TZ variable. This then affects the timestamps
4432 in log files and in Received: headers, and any created Date: header lines. The
4433 required timezone is settable in the configuration file, so nothing can be done
4434 about this earlier - but hopefully nothing will normally be logged earlier than
4435 this. We have to make a new environment if TZ is wrong, but don't bother if
4436 timestamps_utc is set, because then all times are in UTC anyway. */
4438 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4439 f.timestamps_utc = TRUE;
4442 uschar *envtz = US getenv("TZ");
4444 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4445 : timezone_string != NULL
4448 uschar **p = USS environ;
4452 if (environ) while (*p++) count++;
4453 if (!envtz) count++;
4454 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4455 if (environ) for (p = USS environ; *p; p++)
4456 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4457 if (timezone_string)
4459 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4460 sprintf(CS *newp++, "TZ=%s", timezone_string);
4465 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4466 tod_stamp(tod_log));
4470 /* Handle the case when we have removed the setuid privilege because of -C or
4471 -D. This means that the caller of Exim was not root.
4473 There is a problem if we were running as the Exim user. The sysadmin may
4474 expect this case to retain privilege because "the binary was called by the
4475 Exim user", but it hasn't, because either the -D option set macros, or the
4476 -C option set a non-trusted configuration file. There are two possibilities:
4478 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4479 to do message deliveries. Thus, the fact that it is running as a
4480 non-privileged user is plausible, and might be wanted in some special
4481 configurations. However, really_exim will have been set false when
4482 privilege was dropped, to stop Exim trying to write to its normal log
4483 files. Therefore, re-enable normal log processing, assuming the sysadmin
4484 has set up the log directory correctly.
4486 (2) If deliver_drop_privilege is not set, the configuration won't work as
4487 apparently intended, and so we log a panic message. In order to retain
4488 root for -C or -D, the caller must either be root or be invoking a
4489 trusted configuration file (when deliver_drop_privilege is false). */
4491 if ( removed_privilege
4492 && (!f.trusted_config || opt_D_used)
4493 && real_uid == exim_uid)
4494 if (deliver_drop_privilege)
4495 f.really_exim = TRUE; /* let logging work normally */
4497 log_write(0, LOG_MAIN|LOG_PANIC,
4498 "exim user lost privilege for using %s option",
4499 f.trusted_config? "-D" : "-C");
4501 /* Start up Perl interpreter if Perl support is configured and there is a
4502 perl_startup option, and the configuration or the command line specifies
4503 initializing starting. Note that the global variables are actually called
4504 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4507 if (perl_start_option != 0)
4508 opt_perl_at_start = (perl_start_option > 0);
4509 if (opt_perl_at_start && opt_perl_startup != NULL)
4512 const misc_module_info * mi = misc_mod_find(US"perl", &errstr);
4513 typedef uschar * (*fn_t)(uschar *);
4516 exim_fail("exim: error finding perl module: %s\n", errstr);
4518 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4520 if ((errstr = (((fn_t *) mi->functions)[PERL_STARTUP]) (opt_perl_startup)))
4521 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4522 opt_perl_started = TRUE;
4524 #endif /* EXIM_PERL */
4526 /* Log the arguments of the call if the configuration file said so. This is
4527 a debugging feature for finding out what arguments certain MUAs actually use.
4528 Don't attempt it if logging is disabled, or if listing variables or if
4529 verifying/testing addresses or expansions. */
4531 if ( (debug_selector & D_any || LOGGING(arguments))
4532 && f.really_exim && !list_options && !checking)
4534 uschar *p = big_buffer;
4535 Ustrcpy(p, US"cwd= (failed)");
4542 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4543 p += Ustrlen(CCS p);
4546 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4548 for (int i = 0; i < argc; i++)
4550 int len = Ustrlen(argv[i]);
4551 const uschar *printing;
4553 if (p + len + 8 >= big_buffer + big_buffer_size)
4555 Ustrcpy(p, US" ...");
4556 log_write(0, LOG_MAIN, "%s", big_buffer);
4557 Ustrcpy(big_buffer, US"...");
4560 printing = string_printing(argv[i]);
4561 if (!*printing) quote = US"\"";
4564 const uschar *pp = printing;
4566 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4568 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4569 (p - big_buffer) - 4), printing, quote);
4572 if (LOGGING(arguments))
4573 log_write(0, LOG_MAIN, "%s", big_buffer);
4575 debug_printf("%s\n", big_buffer);
4578 /* Set the working directory to be the top-level spool directory. We don't rely
4579 on this in the code, which always uses fully qualified names, but it's useful
4580 for core dumps etc. Don't complain if it fails - the spool directory might not
4581 be generally accessible and calls with the -C option (and others) have lost
4582 privilege by now. Before the chdir, we try to ensure that the directory exists.
4585 if (Uchdir(spool_directory) != 0)
4587 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4588 (void) Uchdir(spool_directory);
4591 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4592 alias file. Exim doesn't have such a concept, but this call is screwed into
4593 Sun's YP makefiles. Handle this by calling a configured script, as the real
4594 user who called Exim. The -oA option can be used to pass an argument to the
4599 (void) fclose(config_file);
4600 if (bi_command && *bi_command)
4603 const uschar * argv[3];
4604 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4605 if (alias_arg) argv[i++] = alias_arg;
4608 setgroups(group_count, group_list);
4609 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4611 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4612 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4614 execv(CS argv[0], (char *const *)argv);
4615 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4619 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4624 /* We moved the admin/trusted check to be immediately after reading the
4625 configuration file. We leave these prints here to ensure that syslog setup,
4626 logfile setup, and so on has already happened. */
4628 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4629 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4631 /* Only an admin user may start the daemon or force a queue run in the default
4632 configuration, but the queue run restriction can be relaxed. Only an admin
4633 user may request that a message be returned to its sender forthwith. Only an
4634 admin user may specify a debug level greater than D_v (because it might show
4635 passwords, etc. in lookup queries). Only an admin user may request a queue
4636 count. Only an admin user can use the test interface to scan for email
4637 (because Exim will be in the spool dir and able to look at mails). */
4641 BOOL debugset = (debug_selector & ~D_v) != 0;
4642 if ( deliver_give_up || f.daemon_listen || malware_test_file
4643 || count_queue && queue_list_requires_admin
4644 || list_queue && queue_list_requires_admin
4645 || qrunners && prod_requires_admin
4646 || queue_name_dest && prod_requires_admin
4647 || debugset && !f.running_in_test_harness
4649 exim_fail("exim:%s permission denied; not admin\n",
4650 debugset ? " debugging" : "");
4653 /* If the real user is not root or the exim uid, the argument for passing
4654 in an open TCP/IP connection for another message is not permitted, nor is
4655 running with the -N option for any delivery action, unless this call to exim is
4656 one that supplied an input message, or we are using a patched exim for
4657 regression testing. */
4659 if ( real_uid != root_uid && real_uid != exim_uid
4660 && ( continue_hostname
4662 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4664 && !f.running_in_test_harness
4666 exim_fail("exim: Permission denied; not exim user or root\n");
4668 /* If the caller is not trusted, certain arguments are ignored when running for
4669 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4670 Note that authority for performing certain actions on messages is tested in the
4671 queue_action() function. */
4673 if (!f.trusted_caller && !checking)
4675 sender_host_name = sender_host_address = interface_address =
4676 sender_ident = received_protocol = NULL;
4677 sender_host_port = interface_port = 0;
4678 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4681 /* If a sender host address is set, extract the optional port number off the
4682 end of it and check its syntax. Do the same thing for the interface address.
4683 Exim exits if the syntax is bad. */
4687 if (sender_host_address)
4688 sender_host_port = check_port(sender_host_address);
4689 if (interface_address)
4690 interface_port = check_port(interface_address);
4693 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4696 if (f.trusted_caller)
4698 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4699 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4702 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4705 /* If an SMTP message is being received check to see if the standard input is a
4706 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4707 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4712 union sockaddr_46 inetd_sock;
4713 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4714 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4716 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4717 if (family == AF_INET || family == AF_INET6)
4719 union sockaddr_46 interface_sock;
4720 size = sizeof(interface_sock);
4722 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4723 interface_address = host_ntoa(-1, &interface_sock, NULL,
4726 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4728 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4731 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4732 NULL, &sender_host_port);
4733 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4734 "inetd is not supported when mua_wrapper is set");
4738 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4743 /* If the load average is going to be needed while receiving a message, get it
4744 now for those OS that require the first call to os_getloadavg() to be done as
4745 root. There will be further calls later for each message received. */
4747 #ifdef LOAD_AVG_NEEDS_ROOT
4748 if ( receiving_message
4749 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4750 load_average = OS_GETLOADAVG();
4753 /* The queue_only configuration option can be overridden by -odx on the command
4754 line, except that if queue_only_override is false, queue_only cannot be unset
4755 from the command line. */
4757 if (queue_only_set && (queue_only_override || arg_queue_only))
4758 queue_only = arg_queue_only;
4760 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4763 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4764 if (arg_smtp_receive_timeout >= 0)
4765 smtp_receive_timeout = arg_smtp_receive_timeout;
4767 /* If Exim was started with root privilege, unless we have already removed the
4768 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4769 except when starting the daemon or doing some kind of delivery or address
4770 testing (-bt). These are the only cases when root need to be retained. We run
4771 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4772 retained only for starting the daemon. We always do the initgroups() in this
4773 situation (controlled by the TRUE below), in order to be as close as possible
4774 to the state Exim usually runs in. */
4776 if ( !unprivileged /* originally had root AND */
4777 && !removed_privilege /* still got root AND */
4778 && !f.daemon_listen /* not starting the daemon */
4779 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4780 && ( /* AND EITHER */
4781 deliver_drop_privilege /* requested unprivileged */
4783 !qrunners /* not running the queue */
4784 && ( msg_action_arg < 0 /* and */
4785 || msg_action != MSG_DELIVER /* not delivering */
4787 && (!checking || !f.address_test_mode) /* not address checking */
4788 && !rcpt_verify_quota /* and not quota checking */
4790 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4792 /* When we are retaining a privileged uid, we still change to the exim gid. */
4797 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4798 rv = setgid(exim_gid);
4799 /* Impact of failure is that some stuff might end up with an incorrect group.
4800 We track this for failures from root, since any attempt to change privilege
4801 by root should succeed and failures should be examined. For non-root,
4802 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4803 no need to complain then. */
4805 if (!(unprivileged || removed_privilege))
4806 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4809 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4810 (long int)exim_gid, strerror(errno));
4814 /* Handle a request to scan a file for malware */
4815 if (malware_test_file)
4817 #ifdef WITH_CONTENT_SCAN
4819 set_process_info("scanning file for malware");
4820 if ((result = malware_in_file(malware_test_file)) == FAIL)
4822 printf("No malware found.\n");
4823 exim_exit(EXIT_SUCCESS);
4827 printf("Malware lookup returned non-okay/fail: %d\n", result);
4828 exim_exit(EXIT_FAILURE);
4831 printf("Malware found: %s\n", malware_name);
4833 printf("Malware scan detected malware of unknown name.\n");
4835 printf("Malware scanning not enabled at compile time.\n");
4837 exim_exit(EXIT_FAILURE);
4840 /* Handle a request to list the delivery queue */
4844 set_process_info("listing the queue");
4845 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4846 exim_exit(EXIT_SUCCESS);
4849 /* Handle a request to count the delivery queue */
4853 set_process_info("counting the queue");
4854 fprintf(stdout, "%u\n", queue_count());
4855 exim_exit(EXIT_SUCCESS);
4858 /* Handle actions on specific messages, except for the force delivery and
4859 message load actions, which are done below. Some actions take a whole list of
4860 message ids, which are known to continue up to the end of the arguments. Others
4861 take a single message id and then operate on the recipients list. */
4863 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4865 int yield = EXIT_SUCCESS;
4866 set_process_info("acting on specified messages");
4868 /* ACL definitions may be needed when removing a message (-Mrm) because
4869 event_action gets expanded */
4871 if (msg_action == MSG_REMOVE)
4873 int old_pool = store_pool;
4874 store_pool = POOL_CONFIG;
4876 store_pool = old_pool;
4877 store_writeprotect(POOL_CONFIG);
4880 if (!one_msg_action)
4882 for (i = msg_action_arg; i < argc; i++)
4883 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4884 yield = EXIT_FAILURE;
4887 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4888 default: printf("\n"); break;
4892 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4893 recipients_arg)) yield = EXIT_FAILURE;
4897 /* We used to set up here to skip reading the ACL section, on
4898 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4899 Now, since the intro of the ${acl } expansion, ACL definitions may be
4900 needed in transports so we lost the optimisation. */
4903 int old_pool = store_pool;
4904 #ifdef MEASURE_TIMING
4906 (void)gettimeofday(&t0, NULL);
4909 store_pool = POOL_CONFIG;
4911 store_pool = old_pool;
4913 /* -be can add macro definitions, needing to link to the macro structure
4914 chain. Otherwise, make the memory used for config data readonly. */
4916 if (!expansion_test)
4917 store_writeprotect(POOL_CONFIG);
4919 #ifdef MEASURE_TIMING
4920 report_time_since(&t0, US"readconf_rest (delta)");
4924 /* Handle a request to check quota */
4925 if (rcpt_verify_quota)
4926 if (real_uid != root_uid && real_uid != exim_uid)
4927 exim_fail("exim: Permission denied\n");
4928 else if (recipients_arg >= argc)
4929 exim_fail("exim: missing recipient for quota check\n");
4932 verify_quota(US argv[recipients_arg]); /*XXX we lose track of const here */
4933 exim_exit(EXIT_SUCCESS);
4936 /* Handle the -brt option. This is for checking out retry configurations.
4937 The next three arguments are a domain name or a complete address, and
4938 optionally two error numbers. All it does is to call the function that
4939 scans the retry configuration data. */
4941 if (test_retry_arg >= 0)
4943 retry_config *yield;
4944 int basic_errno = 0;
4946 const uschar *s1, *s2;
4948 if (test_retry_arg >= argc)
4950 printf("-brt needs a domain or address argument\n");
4951 exim_exit(EXIT_FAILURE);
4953 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4956 /* If the first argument contains no @ and no . it might be a local user
4957 or it might be a single-component name. Treat as a domain. */
4959 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4961 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4962 "being \ntreated as a one-component domain, not as a local part.\n\n",
4966 /* There may be an optional second domain arg. */
4968 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4969 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4971 /* The final arg is an error name */
4973 if (test_retry_arg < argc)
4975 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4977 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4980 printf("%s\n", CS error);
4981 return EXIT_FAILURE;
4984 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4985 code > 100 as an error is for matching codes to the decade. Turn them into
4986 a real error code, off the decade. */
4988 if (basic_errno == ERRNO_MAIL4XX ||
4989 basic_errno == ERRNO_RCPT4XX ||
4990 basic_errno == ERRNO_DATA4XX)
4992 int code = (more_errno >> 8) & 255;
4994 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4995 else if (code > 100)
4996 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
5000 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
5001 printf("No retry information found\n");
5004 more_errno = yield->more_errno;
5005 printf("Retry rule: %s ", yield->pattern);
5007 if (yield->basic_errno == ERRNO_EXIMQUOTA)
5009 printf("quota%s%s ",
5010 (more_errno > 0)? "_" : "",
5011 (more_errno > 0)? readconf_printtime(more_errno) : US"");
5013 else if (yield->basic_errno == ECONNREFUSED)
5015 printf("refused%s%s ",
5016 (more_errno > 0)? "_" : "",
5017 (more_errno == 'M')? "MX" :
5018 (more_errno == 'A')? "A" : "");
5020 else if (yield->basic_errno == ETIMEDOUT)
5023 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
5025 if (more_errno != 0) printf("_%s",
5026 (more_errno == 'M')? "MX" : "A");
5029 else if (yield->basic_errno == ERRNO_AUTHFAIL)
5030 printf("auth_failed ");
5033 for (retry_rule * r = yield->rules; r; r = r->next)
5035 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
5036 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
5042 printf(",%d.", x/1000);
5056 exim_exit(EXIT_SUCCESS);
5059 /* Handle a request to list one or more configuration options */
5060 /* If -n was set, we suppress some information */
5065 set_process_info("listing variables");
5066 if (recipients_arg >= argc)
5067 fail = !readconf_print(US"all", NULL, flag_n);
5068 else for (i = recipients_arg; i < argc; i++)
5071 (Ustrcmp(argv[i], "router") == 0 ||
5072 Ustrcmp(argv[i], "transport") == 0 ||
5073 Ustrcmp(argv[i], "authenticator") == 0 ||
5074 Ustrcmp(argv[i], "macro") == 0 ||
5075 Ustrcmp(argv[i], "environment") == 0))
5077 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
5081 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
5083 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
5088 set_process_info("listing config");
5089 exim_exit(readconf_print(US"config", NULL, flag_n)
5090 ? EXIT_SUCCESS : EXIT_FAILURE);
5094 /* Initialise subsystems as required. */
5098 /* Handle a request to deliver one or more messages that are already on the
5099 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
5100 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
5102 Delivery of specific messages is typically used for a small number when
5103 prodding by hand (when the option forced_delivery will be set) or when
5104 re-execing to regain root privilege. Each message delivery must happen in a
5105 separate process, so we fork a process for each one, and run them sequentially
5106 so that debugging output doesn't get intertwined, and to avoid spawning too
5107 many processes if a long list is given. However, don't fork for the last one;
5108 this saves a process in the common case when Exim is called to deliver just one
5111 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
5113 if (prod_requires_admin && !f.admin_user)
5115 fprintf(stderr, "exim: Permission denied\n");
5116 exim_exit(EXIT_FAILURE);
5118 set_process_info("delivering specified messages");
5119 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
5120 for (i = msg_action_arg; i < argc; i++)
5124 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
5125 that runs into a later copy into the untainted global message_id[] */
5126 /*XXX Do we need a length limit check here? */
5128 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5129 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
5131 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5132 exim_underbar_exit(EXIT_SUCCESS);
5136 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
5138 exim_exit(EXIT_FAILURE);
5142 exim_exit(EXIT_SUCCESS);
5146 /* If only a single queue run is requested, without SMTP listening, we can just
5147 turn into a queue runner, with an optional starting message id. */
5149 if (is_onetime_qrun() && !f.daemon_listen)
5151 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
5152 exim_exit(EXIT_SUCCESS);
5156 /* Find the login name of the real user running this process. This is always
5157 needed when receiving a message, because it is written into the spool file. It
5158 may also be used to construct a from: or a sender: header, and in this case we
5159 need the user's full name as well, so save a copy of it, checked for RFC822
5160 syntax and munged if necessary, if it hasn't previously been set by the -F
5161 argument. We may try to get the passwd entry more than once, in case NIS or
5162 other delays are in evidence. Save the home directory for use in filter testing
5167 if ((pw = getpwuid(real_uid)) != NULL)
5169 originator_login = string_copy(US pw->pw_name);
5170 originator_home = string_copy(US pw->pw_dir);
5172 /* If user name has not been set by -F, set it from the passwd entry
5173 unless -f has been used to set the sender address by a trusted user. */
5175 if (!originator_name)
5177 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5179 uschar *name = US pw->pw_gecos;
5180 uschar *amp = Ustrchr(name, '&');
5183 /* Most Unix specify that a '&' character in the gecos field is
5184 replaced by a copy of the login name, and some even specify that
5185 the first character should be upper cased, so that's what we do. */
5190 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5191 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5192 buffer[loffset] = toupper(buffer[loffset]);
5196 /* If a pattern for matching the gecos field was supplied, apply
5197 it and then expand the name string. */
5199 GET_OPTION("gecos_pattern");
5200 GET_OPTION("gecos_name");
5201 if (gecos_pattern && gecos_name)
5203 const pcre2_code *re;
5204 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5206 if (regex_match_and_setup(re, name, 0, -1))
5208 uschar *new_name = expand_string(gecos_name);
5212 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5213 "gecos field \"%s\"\n", new_name, name);
5216 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5217 "\"%s\": %s\n", gecos_name, expand_string_message);
5219 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5220 "gecos field \"%s\"\n", gecos_pattern, name);
5221 store_free((void *)re);
5223 originator_name = string_copy(name);
5226 /* A trusted caller has used -f but not -F */
5228 else originator_name = US"";
5231 /* Break the retry loop */
5236 if (++i > finduser_retries) break;
5240 /* If we cannot get a user login, log the incident and give up, unless the
5241 configuration specifies something to use. When running in the test harness,
5242 any setting of unknown_login overrides the actual name. */
5244 if (!originator_login || f.running_in_test_harness)
5246 GET_OPTION("unknown_login");
5249 originator_login = expand_string(unknown_login);
5250 if (!originator_name && unknown_username)
5251 originator_name = expand_string(unknown_username);
5252 if (!originator_name) originator_name = US"";
5254 if (!originator_login)
5255 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5259 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5262 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5264 /* If a message is created by this call of Exim, the uid/gid of its originator
5265 are those of the caller. These values are overridden if an existing message is
5266 read in from the spool. */
5268 originator_uid = real_uid;
5269 originator_gid = real_gid;
5271 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5272 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5274 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5275 returns. We leave this till here so that the originator_ fields are available
5276 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5279 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5283 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5284 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5285 "mua_wrapper is set");
5288 # ifndef DISABLE_TLS
5289 /* This also checks that the library linkage is working and we can call
5290 routines in it, so call even if tls_require_ciphers is unset */
5292 # ifdef MEASURE_TIMING
5294 (void)gettimeofday(&t0, NULL);
5296 if (!tls_dropprivs_validate_require_cipher(FALSE))
5297 exim_exit(EXIT_FAILURE);
5298 # ifdef MEASURE_TIMING
5299 report_time_since(&t0, US"validate_ciphers (delta)");
5307 /* If the sender ident has not been set (by a trusted caller) set it to
5308 the caller. This will get overwritten below for an inetd call. If a trusted
5309 caller has set it empty, unset it. */
5311 if (!sender_ident) sender_ident = originator_login;
5312 else if (!*sender_ident) sender_ident = NULL;
5314 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5315 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5316 originator_* variables set. */
5318 if (test_rewrite_arg >= 0)
5320 f.really_exim = FALSE;
5321 if (test_rewrite_arg >= argc)
5323 printf("-brw needs an address argument\n");
5324 exim_exit(EXIT_FAILURE);
5326 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5327 exim_exit(EXIT_SUCCESS);
5330 /* A locally-supplied message is considered to be coming from a local user
5331 unless a trusted caller supplies a sender address with -f, or is passing in the
5332 message via SMTP (inetd invocation or otherwise). */
5334 if ( !sender_address && !smtp_input
5335 || !f.trusted_caller && filter_test == FTEST_NONE)
5337 f.sender_local = TRUE;
5339 /* A trusted caller can supply authenticated_sender and authenticated_id
5340 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5341 defaults except when host checking. */
5343 if (!authenticated_sender && !host_checking)
5344 authenticated_sender = string_sprintf("%s@%s", originator_login,
5345 qualify_domain_sender);
5346 if (!authenticated_id && !host_checking)
5347 authenticated_id = originator_login;
5350 /* Trusted callers are always permitted to specify the sender address.
5351 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5352 is specified is the empty address. However, if a trusted caller does not
5353 specify a sender address for SMTP input, we leave sender_address unset. This
5354 causes the MAIL commands to be honoured. */
5356 if ( !smtp_input && !sender_address
5357 || !receive_check_set_sender(sender_address))
5359 /* Either the caller is not permitted to set a general sender, or this is
5360 non-SMTP input and the trusted caller has not set a sender. If there is no
5361 sender, or if a sender other than <> is set, override with the originator's
5362 login (which will get qualified below), except when checking things. */
5364 if ( !sender_address /* No sender_address set */
5366 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5367 !checking)) /* Not running tests, including filter tests */
5369 sender_address = originator_login;
5370 f.sender_address_forced = FALSE;
5371 sender_address_domain = 0;
5375 /* Remember whether an untrusted caller set the sender address */
5377 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5379 /* Ensure that the sender address is fully qualified unless it is the empty
5380 address, which indicates an error message, or doesn't exist (root caller, smtp
5381 interface, no -f argument). */
5383 if (sender_address && *sender_address && sender_address_domain == 0)
5384 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5385 qualify_domain_sender);
5387 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5389 /* Handle a request to verify a list of addresses, or test them for delivery.
5390 This must follow the setting of the sender address, since routers can be
5391 predicated upon the sender. If no arguments are given, read addresses from
5392 stdin. Set debug_level to at least D_v to get full output for address testing.
5395 if (verify_address_mode || f.address_test_mode)
5398 int flags = vopt_qualify;
5400 if (verify_address_mode)
5402 if (!verify_as_sender) flags |= vopt_is_recipient;
5403 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5408 flags |= vopt_is_recipient;
5409 debug_selector |= D_v;
5410 debug_file = stderr;
5411 debug_fd = fileno(debug_file);
5412 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5415 if (recipients_arg < argc)
5416 while (recipients_arg < argc)
5418 /* Supplied addresses are tainted since they come from a user */
5419 uschar * s = string_copy_taint(
5420 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5424 BOOL finished = FALSE;
5425 uschar *ss = parse_find_address_end(s, FALSE);
5426 if (*ss == ',') *ss = 0; else finished = TRUE;
5427 test_address(s, flags, &exit_value);
5430 while (*++s == ',' || isspace(*s)) ;
5436 uschar * s = get_stdinput(NULL, NULL);
5438 test_address(string_copy_taint(
5439 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5441 flags, &exit_value);
5445 exim_exit(exit_value);
5448 /* Handle expansion checking. Either expand items on the command line, or read
5449 from stdin if there aren't any. If -Mset was specified, load the message so
5450 that its variables can be used, but restrict this facility to admin users.
5451 Otherwise, if -bem was used, read a message from stdin. */
5455 dns_init(FALSE, FALSE, FALSE);
5456 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5460 exim_fail("exim: permission denied\n");
5461 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5462 /* Checking the length of the ID is sufficient to validate it.
5463 Get an untainted version so file opens can be done. */
5464 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5466 spoolname = string_sprintf("%s-H", message_id);
5467 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5468 printf ("Failed to load message datafile %s\n", message_id);
5469 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5470 printf ("Failed to load message %s\n", message_id);
5473 /* Read a test message from a file. We fudge it up to be on stdin, saving
5474 stdin itself for later reading of expansion strings. */
5476 else if (expansion_test_message)
5478 uschar * rme = expand_string(recipients_max);
5479 int save_stdin = dup(0);
5480 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5482 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5485 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5486 message_ended = END_NOTENDED;
5487 recipients_max_expanded = atoi(CCS rme);
5488 read_message_body(receive_msg(extract_recipients));
5489 message_linecount += body_linecount;
5490 (void)dup2(save_stdin, 0);
5491 (void)close(save_stdin);
5492 clearerr(stdin); /* Required by Darwin */
5495 /* Only admin users may see config-file macros this way */
5497 if (!f.admin_user) macros_user = macros = mlast = NULL;
5499 /* Allow $recipients for this testing */
5501 f.enable_dollar_recipients = TRUE;
5503 /* Expand command line items */
5505 if (recipients_arg < argc)
5507 config_filename = US"-be args";
5508 for (config_lineno = 1; recipients_arg < argc; config_lineno++)
5509 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++],
5510 EXIM_EMAILADDR_MAX, "-be arg"));
5517 char *(*fn_readline)(const char *) = NULL;
5518 void (*fn_addhist)(const char *) = NULL;
5522 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5525 config_filename = US"-be stdin";
5526 for (config_lineno = 1; s = get_stdinput(fn_readline, fn_addhist);
5528 expansion_test_line(s);
5531 if (dlhandle) dlclose(dlhandle);
5535 /* The data file will be open after -Mset */
5537 if (deliver_datafile >= 0)
5539 (void)close(deliver_datafile);
5540 deliver_datafile = -1;
5543 exim_exit(EXIT_SUCCESS);
5547 /* The active host name is normally the primary host name, but it can be varied
5548 for hosts that want to play several parts at once. We need to ensure that it is
5549 set for host checking, and for receiving messages. */
5551 smtp_active_hostname = primary_hostname;
5552 GET_OPTION("smtp_active_hostname");
5553 if (raw_active_hostname)
5555 uschar * nah = expand_string(raw_active_hostname);
5558 if (!f.expand_string_forcedfail)
5559 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5560 "(smtp_active_hostname): %s", raw_active_hostname,
5561 expand_string_message);
5563 else if (nah[0]) smtp_active_hostname = nah;
5566 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5567 given IP address so that the blocking and relay configuration can be tested.
5568 Unless a sender_ident was set by -oMt, we discard it (the default is the
5569 caller's login name). An RFC 1413 call is made only if we are running in the
5570 test harness and an incoming interface and both ports are specified, because
5571 there is no TCP/IP call to find the ident for. */
5578 if (!sender_ident_set)
5580 sender_ident = NULL;
5581 if (f.running_in_test_harness && sender_host_port
5582 && interface_address && interface_port)
5583 verify_get_ident(1223); /* note hardwired port number */
5586 /* In case the given address is a non-canonical IPv6 address, canonicalize
5587 it. Use the compressed form for IPv6. */
5589 size = host_aton(sender_host_address, x);
5590 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5592 (void) host_nmtoa(size, x, -1, sender_host_address, ':');
5594 (void) ipv6_nmtoa(x, sender_host_address);
5596 /* Now set up for testing */
5598 host_build_sender_fullhost();
5602 f.sender_local = FALSE;
5603 f.sender_host_notsocket = TRUE;
5604 debug_file = stderr;
5605 debug_fd = fileno(debug_file);
5606 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5607 "**** but without any ident (RFC 1413) callback.\n"
5608 "**** This is not for real!\n\n",
5609 sender_host_address);
5611 set_connection_id();
5612 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5613 if (verify_check_host(&hosts_connection_nolog) == OK)
5615 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5616 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5618 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5620 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5621 because a log line has already been written for all its failure exists
5622 (usually "connection refused: <reason>") and writing another one is
5623 unnecessary clutter. */
5625 if (smtp_start_session())
5628 for (; (reset_point = store_mark()); store_reset(reset_point))
5630 if (smtp_setup_msg() <= 0) break;
5631 if (!receive_msg(FALSE)) break;
5633 return_path = sender_address = NULL;
5634 dnslist_domain = dnslist_matched = NULL;
5636 deliver_localpart_orig = NULL;
5637 deliver_domain_orig = NULL;
5638 callout_address = sending_ip_address = NULL;
5639 deliver_localpart_data = deliver_domain_data =
5640 recipient_data = sender_data = NULL;
5641 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5645 exim_exit(EXIT_SUCCESS);
5649 /* Arrange for message reception if recipients or SMTP were specified;
5650 otherwise complain unless a version print (-bV) happened or this is a filter
5651 verification test or info dump.
5652 In the former case, show the configuration file name. */
5654 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5656 if (version_printed)
5658 if (Ustrchr(config_main_filelist, ':'))
5659 printf("Configuration file search path is %s\n", config_main_filelist);
5660 printf("Configuration file is %s\n", config_main_filename);
5661 return EXIT_SUCCESS;
5664 if (info_flag != CMDINFO_NONE)
5666 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5667 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5670 if (filter_test == FTEST_NONE)
5671 exim_usage(called_as);
5675 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5676 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5677 that we are not called from inetd, because that is rejected above. The
5678 following configuration settings are forced here:
5680 (1) Synchronous delivery (-odi)
5681 (2) Errors to stderr (-oep == -oeq)
5682 (3) No parallel remote delivery
5683 (4) Unprivileged delivery
5685 We don't force overall queueing options because there are several of them;
5686 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5687 to override any SMTP queueing. */
5691 f.synchronous_delivery = TRUE;
5692 arg_error_handling = ERRORS_STDERR;
5693 remote_max_parallel = 1;
5694 deliver_drop_privilege = TRUE;
5695 f.queue_smtp = FALSE;
5696 queue_smtp_domains = NULL;
5698 message_utf8_downconvert = -1; /* convert-if-needed */
5703 /* Prepare to accept one or more new messages on the standard input. When a
5704 message has been read, its id is returned in message_id[]. If doing immediate
5705 delivery, we fork a delivery process for each received message, except for the
5706 last one, where we can save a process switch.
5708 It is only in non-smtp mode that error_handling is allowed to be changed from
5709 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5710 sendmail error modes other than -oem ever actually used? Later: yes.) */
5712 if (!smtp_input) error_handling = arg_error_handling;
5714 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5715 logging being sent down the socket and make an identd call to get the
5718 else if (f.is_inetd)
5720 (void)fclose(stderr);
5721 exim_nullstd(); /* Re-open to /dev/null */
5722 verify_get_ident(IDENT_PORT);
5723 host_build_sender_fullhost();
5724 set_process_info("handling incoming connection from %s via inetd",
5728 /* If the sender host address has been set, build sender_fullhost if it hasn't
5729 already been done (which it will have been for inetd). This caters for the
5730 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5731 so that the test for IP options is skipped for -bs input. */
5733 if (sender_host_address && !sender_fullhost)
5735 host_build_sender_fullhost();
5736 set_process_info("handling incoming connection from %s via -oMa",
5738 f.sender_host_notsocket = TRUE;
5741 /* Otherwise, set the sender host as unknown except for inetd calls. This
5742 prevents host checking in the case of -bs not from inetd and also for -bS. */
5744 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5746 /* If stdout does not exist, then dup stdin to stdout. This can happen
5747 if exim is started from inetd. In this case fd 0 will be set to the socket,
5748 but fd 1 will not be set. This also happens for passed SMTP channels. */
5750 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5752 /* Set up the incoming protocol name and the state of the program. Root is
5753 allowed to force received protocol via the -oMr option above. If we have come
5754 via inetd, the process info has already been set up. We don't set
5755 received_protocol here for smtp input, as it varies according to
5756 batch/HELO/EHLO/AUTH/TLS. */
5760 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5761 smtp_batched_input? "batched " : "",
5762 sender_address ? sender_address : originator_login);
5766 int old_pool = store_pool;
5767 store_pool = POOL_PERM;
5768 if (!received_protocol)
5769 received_protocol = string_sprintf("local%s", called_as);
5770 store_pool = old_pool;
5771 set_process_info("accepting a local non-SMTP message from <%s>",
5775 /* Initialize the session_local_queue-only flag (this will be ignored if
5776 mua_wrapper is set) */
5779 session_local_queue_only = queue_only;
5781 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5782 the spool if so configured. On failure, we must not attempt to send an error
5783 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5784 error code is given.) */
5786 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5787 exim_fail("exim: insufficient disk space\n");
5789 /* If this is smtp input of any kind, real or batched, handle the start of the
5792 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5793 because a log line has already been written for all its failure exists
5794 (usually "connection refused: <reason>") and writing another one is
5795 unnecessary clutter. */
5797 set_connection_id();
5802 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5803 if (verify_check_host(&hosts_connection_nolog) == OK)
5805 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5806 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5808 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5809 if (!smtp_start_session())
5812 exim_exit(EXIT_SUCCESS);
5816 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5817 (we handle buferring so as to have visibility of fill level). */
5821 GET_OPTION("message_size_limit");
5822 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5823 if (expand_string_message)
5824 if (thismessage_size_limit == -1)
5825 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5826 "message_size_limit: %s", expand_string_message);
5828 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5829 "message_size_limit: %s", expand_string_message);
5831 setvbuf(stdin, NULL, _IONBF, 0);
5834 /* Loop for several messages when reading SMTP input. If we fork any child
5835 processes, we don't want to wait for them unless synchronous delivery is
5836 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5837 same as SIG_DFL, despite the fact that documentation often lists the default as
5838 "ignore". This is a confusing area. This is what I know:
5840 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5841 processes that complete simply to go away without ever becoming defunct. You
5842 can't then wait for them - but we don't want to wait for them in the
5843 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5844 happen for all OS (e.g. *BSD is different).
5846 But that's not the end of the story. Some (many? all?) systems have the
5847 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5848 has by default, so it seems that the difference is merely one of default
5849 (compare restarting vs non-restarting signals).
5851 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5852 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5853 of the loop below. Paranoia rules.
5855 February 2003: That's *still* not the end of the story. There are now versions
5856 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5857 process then calls waitpid(), a grumble is written to the system log, because
5858 this is logically inconsistent. In other words, it doesn't like the paranoia.
5859 As a consequence of this, the waitpid() below is now excluded if we are sure
5860 that SIG_IGN works. */
5862 if (!f.synchronous_delivery)
5865 struct sigaction act;
5866 act.sa_handler = SIG_IGN;
5867 sigemptyset(&(act.sa_mask));
5868 act.sa_flags = SA_NOCLDWAIT;
5869 sigaction(SIGCHLD, &act, NULL);
5871 signal(SIGCHLD, SIG_IGN);
5875 /* Save the current store pool point, for resetting at the start of
5876 each message, and save the real sender address, if any. */
5878 real_sender_address = sender_address;
5880 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5881 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5884 for (BOOL more = TRUE; more; )
5886 rmark reset_point = store_mark();
5889 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5890 input and build the recipients list, before calling receive_msg() to read the
5891 message proper. Whatever sender address is given in the SMTP transaction is
5892 often ignored for local senders - we use the actual sender, which is normally
5893 either the underlying user running this process or a -f argument provided by
5894 a trusted caller. It is saved in real_sender_address. The test for whether to
5895 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5900 if ((rc = smtp_setup_msg()) > 0)
5902 if ( real_sender_address
5903 && !receive_check_set_sender(sender_address))
5905 sender_address = raw_sender = real_sender_address;
5906 sender_address_unrewritten = NULL;
5909 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5910 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5911 the very end. The result of the ACL is ignored (as for other non-SMTP
5912 messages). It is run for its potential side effects. */
5914 if (smtp_batched_input)
5916 GET_OPTION("acl_not_smtp_start");
5917 if (acl_not_smtp_start)
5919 uschar * user_msg, * log_msg;
5920 f.enable_dollar_recipients = TRUE;
5921 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5922 &user_msg, &log_msg);
5923 f.enable_dollar_recipients = FALSE;
5927 /* Now get the data for the message */
5929 more = receive_msg(extract_recipients);
5932 cancel_cutthrough_connection(TRUE, US"receive dropped");
5933 if (more) goto MORELOOP;
5934 smtp_log_no_mail(); /* Log no mail if configured */
5935 exim_exit(EXIT_FAILURE);
5940 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5941 smtp_log_no_mail(); /* Log no mail if configured */
5942 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5946 /* In the non-SMTP case, we have all the information from the command
5947 line, but must process it in case it is in the more general RFC822
5948 format, and in any case, to detect syntax errors. Also, it appears that
5949 the use of comma-separated lists as single arguments is common, so we
5950 had better support them. */
5954 uschar * rme = expand_string(recipients_max);
5955 int rcount = 0, count = argc - recipients_arg;
5956 const uschar ** list = argv + recipients_arg;
5958 recipients_max_expanded = atoi(CCS rme);
5960 /* These options cannot be changed dynamically for non-SMTP messages */
5962 f.active_local_sender_retain = local_sender_retain;
5963 f.active_local_from_check = local_from_check;
5965 /* Save before any rewriting */
5967 raw_sender = string_copy(sender_address);
5969 /* Loop for each argument (supplied by user hence tainted) */
5971 for (int i = 0; i < count; i++)
5973 int start, end, domain;
5975 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5976 We'll still want to cap it to something, just in case. */
5977 uschar * s = string_copy_taint(
5978 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5981 /* Loop for each comma-separated address */
5985 BOOL finished = FALSE;
5987 uschar * ss = parse_find_address_end(s, FALSE);
5989 if (*ss == ',') *ss = 0; else finished = TRUE;
5991 /* Check max recipients - if -t was used, these aren't recipients */
5993 if ( recipients_max_expanded > 0 && ++rcount > recipients_max_expanded
5994 && !extract_recipients)
5996 DEBUG(D_all) debug_printf("excess reipients (max %d)\n",
5997 recipients_max_expanded);
5999 if (error_handling == ERRORS_STDERR)
6001 fprintf(stderr, "exim: too many recipients\n");
6002 exim_exit(EXIT_FAILURE);
6006 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
6007 errors_sender_rc : EXIT_FAILURE;
6012 BOOL b = allow_utf8_domains;
6013 allow_utf8_domains = TRUE;
6016 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
6020 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
6021 else allow_utf8_domains = b;
6026 if (domain == 0 && !f.allow_unqualified_recipient)
6029 errmess = US"unqualified recipient address not allowed";
6034 DEBUG(D_all) debug_printf("bad recipient address \"%s\": %s\n",
6035 string_printing(list[i]), errmess);
6037 if (error_handling == ERRORS_STDERR)
6039 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
6040 string_printing(list[i]), errmess);
6041 exim_exit(EXIT_FAILURE);
6047 eblock.text1 = string_printing(list[i]);
6048 eblock.text2 = errmess;
6050 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
6051 errors_sender_rc : EXIT_FAILURE;
6055 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
6058 while (*++s && (*s == ',' || isspace(*s)));
6062 /* Show the recipients when debugging */
6066 if (sender_address) debug_printf("Sender: %s\n", sender_address);
6067 if (recipients_list)
6069 debug_printf("Recipients:\n");
6070 for (int i = 0; i < recipients_count; i++)
6071 debug_printf(" %s\n", recipients_list[i].address);
6075 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
6076 ignored; rejecting here would just add complication, and it can just as
6077 well be done later. Allow $recipients to be visible in the ACL. */
6079 GET_OPTION("acl_not_smtp_start");
6080 if (acl_not_smtp_start)
6082 uschar * user_msg, * log_msg;
6083 f.enable_dollar_recipients = TRUE;
6084 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
6085 &user_msg, &log_msg);
6086 f.enable_dollar_recipients = FALSE;
6089 /* Pause for a while waiting for input. If none received in that time,
6090 close the logfile, if we had one open; then if we wait for a long-running
6091 datasource (months, in one use-case) log rotation will not leave us holding
6094 if (!receive_timeout)
6095 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
6098 /* Read the data for the message. If filter_test is not FTEST_NONE, this
6099 will just read the headers for the message, and not write anything onto the
6102 message_ended = END_NOTENDED;
6103 more = receive_msg(extract_recipients);
6105 /* more is always FALSE here (not SMTP message) when reading a message
6106 for real; when reading the headers of a message for filter testing,
6107 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
6109 if (!message_id[0]) exim_exit(EXIT_FAILURE);
6110 } /* Non-SMTP message reception */
6112 /* If this is a filter testing run, there are headers in store, but
6113 no message on the spool. Run the filtering code in testing mode, setting
6114 the domain to the qualify domain and the local part to the current user,
6115 unless they have been set by options. The prefix and suffix are left unset
6116 unless specified. The the return path is set to to the sender unless it has
6117 already been set from a return-path header in the message. */
6119 if (filter_test != FTEST_NONE)
6121 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
6122 deliver_domain_orig = deliver_domain;
6123 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
6124 deliver_localpart_orig = deliver_localpart;
6125 deliver_localpart_prefix = US ftest_prefix;
6126 deliver_localpart_suffix = US ftest_suffix;
6127 deliver_home = originator_home;
6131 printf("Return-path copied from sender\n");
6132 return_path = string_copy(sender_address);
6135 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
6136 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
6138 receive_add_recipient(
6139 string_sprintf("%s%s%s@%s",
6140 ftest_prefix ? ftest_prefix : US"",
6142 ftest_suffix ? ftest_suffix : US"",
6143 deliver_domain), -1);
6145 printf("Recipient = %s\n", recipients_list[0].address);
6146 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
6147 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
6149 if (chdir("/")) /* Get away from wherever the user is running this from */
6151 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
6152 exim_exit(EXIT_FAILURE);
6155 /* Now we run either a system filter test, or a user filter test, or both.
6156 In the latter case, headers added by the system filter will persist and be
6157 available to the user filter. We need to copy the filter variables
6160 if (filter_test & FTEST_SYSTEM)
6161 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
6162 exim_exit(EXIT_FAILURE);
6164 memcpy(filter_sn, filter_n, sizeof(filter_sn));
6166 if (filter_test & FTEST_USER)
6167 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
6168 exim_exit(EXIT_FAILURE);
6170 exim_exit(EXIT_SUCCESS);
6173 /* Else act on the result of message reception. We should not get here unless
6174 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
6175 will be TRUE. If it is not, check on the number of messages received in this
6178 if ( !session_local_queue_only
6179 && smtp_accept_queue_per_connection > 0
6180 && receive_messagecount > smtp_accept_queue_per_connection)
6182 session_local_queue_only = TRUE;
6183 queue_only_reason = 2;
6186 /* Initialize local_queue_only from session_local_queue_only. If it is false,
6187 and queue_only_load is set, check that the load average is below it. If it is
6188 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
6189 default), we put the whole session into queue_only mode. It then remains this
6190 way for any subsequent messages on the same SMTP connection. This is a
6191 deliberate choice; even though the load average may fall, it doesn't seem
6192 right to deliver later messages on the same call when not delivering earlier
6193 ones. However, there are odd cases where this is not wanted, so this can be
6194 changed by setting queue_only_load_latch false. */
6196 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
6197 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
6199 queue_only_reason = 3;
6200 if (queue_only_load_latch) session_local_queue_only = TRUE;
6203 /* If running as an MUA wrapper, all queueing options and freezing options
6207 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6209 /* Log the queueing here, when it will get a message id attached, but
6210 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6213 if (local_queue_only)
6215 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6216 switch(queue_only_reason)
6219 log_write(L_delay_delivery,
6220 LOG_MAIN, "no immediate delivery: more than %d messages "
6221 "received in one connection", smtp_accept_queue_per_connection);
6225 log_write(L_delay_delivery,
6226 LOG_MAIN, "no immediate delivery: load average %.2f",
6227 (double)load_average/1000.0);
6232 else if (f.queue_only_policy || f.deliver_freeze)
6233 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6235 /* Else do the delivery unless the ACL or local_scan() called for queue only
6236 or froze the message. Always deliver in a separate process. A fork failure is
6237 not a disaster, as the delivery will eventually happen on a subsequent queue
6238 run. The search cache must be tidied before the fork, as the parent will
6239 do it before exiting. The child will trigger a lookup failure and
6240 thereby defer the delivery if it tries to use (for example) a cached ldap
6241 connection that the parent has called unbind on. */
6248 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6251 close_unwanted(); /* Close unwanted file descriptors and TLS */
6252 exim_nullstd(); /* Ensure std{in,out,err} exist */
6254 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6255 mode, deliver_drop_privilege is forced TRUE). */
6257 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6259 delivery_re_exec(CEE_EXEC_EXIT);
6260 /* Control does not return here. */
6263 /* No need to re-exec */
6265 rc = deliver_message(message_id, FALSE, FALSE);
6267 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6268 ? EXIT_SUCCESS : EXIT_FAILURE);
6273 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6274 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6275 "process: %s", strerror(errno));
6279 release_cutthrough_connection(US"msg passed for delivery");
6281 /* In the parent, wait if synchronous delivery is required. This will
6282 always be the case in MUA wrapper mode. */
6284 if (f.synchronous_delivery)
6287 while (wait(&status) != pid);
6288 if ((status & 0x00ff) != 0)
6289 log_write(0, LOG_MAIN|LOG_PANIC,
6290 "process %d crashed with signal %d while delivering %s",
6291 (int)pid, status & 0x00ff, message_id);
6292 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6297 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6298 automatically reaps children (see comments above the loop), clear away any
6299 finished subprocesses here, in case there are lots of messages coming in
6300 from the same source. */
6302 #ifndef SIG_IGN_WORKS
6303 while (waitpid(-1, NULL, WNOHANG) > 0);
6307 return_path = sender_address = NULL;
6308 authenticated_sender = NULL;
6309 deliver_localpart_orig = NULL;
6310 deliver_domain_orig = NULL;
6311 deliver_host = deliver_host_address = NULL;
6312 dnslist_domain = dnslist_matched = NULL;
6313 #ifdef WITH_CONTENT_SCAN
6314 malware_name = NULL;
6317 callout_address = NULL;
6318 sending_ip_address = NULL;
6319 deliver_localpart_data = deliver_domain_data =
6320 recipient_data = sender_data = NULL;
6322 lookup_value = NULL; /* Can be set by ACL */
6324 store_reset(reset_point);
6327 exim_exit(EXIT_SUCCESS); /* Never returns */
6328 return 0; /* To stop compiler warning */