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 #ifdef SUPPORT_CRYPTEQ
1225 g = string_cat(g, US" crypteq");
1227 #ifdef EXPAND_DLFUNC
1228 g = string_cat(g, US" Expand_dlfunc");
1231 g = string_cat(g, US" iconv()");
1234 g = string_cat(g, US" IPv6");
1237 g = string_cat(g, US" PAM");
1240 g = string_cat(g, US" Perl");
1243 g = string_cat(g, US" GnuTLS");
1245 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1246 g = string_cat(g, US" move_frozen_messages");
1249 g = string_cat(g, US" OpenSSL");
1251 #if defined(CYRUS_PWCHECK_SOCKET)
1252 g = string_cat(g, US" pwcheck");
1254 #if defined(RADIUS_CONFIG_FILE)
1255 g = string_cat(g, US" radius");
1257 #ifndef DISABLE_TLS_RESUME
1258 g = string_cat(g, US" TLS_resume");
1260 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1261 g = string_cat(g, US" translate_ip_address");
1263 #ifdef USE_TCP_WRAPPERS
1264 g = string_cat(g, US" TCPwrappers");
1266 #ifdef HAVE_SETCLASSRESOURCES
1267 g = string_cat(g, US" use_setclassresources");
1270 g = string_cat(g, US" DANE");
1272 #ifndef DISABLE_DKIM
1273 g = string_cat(g, US" DKIM");
1275 #ifdef SUPPORT_DMARC
1276 g = string_cat(g, US" DMARC");
1278 #ifndef DISABLE_DNSSEC
1279 g = string_cat(g, US" DNSSEC");
1281 #ifndef DISABLE_ESMTP_LIMITS
1282 g = string_cat(g, US" ESMTP_Limits");
1284 #ifndef DISABLE_WELLKNOWN
1285 g = string_cat(g, US" ESMTP_Wellknown");
1287 #ifndef DISABLE_EVENT
1288 g = string_cat(g, US" Event");
1291 g = string_cat(g, US" I18N");
1293 #ifndef DISABLE_OCSP
1294 g = string_cat(g, US" OCSP");
1296 #ifndef DISABLE_PIPE_CONNECT
1297 g = string_cat(g, US" PIPECONNECT");
1299 #ifndef DISABLE_PRDR
1300 g = string_cat(g, US" PRDR");
1302 #ifdef SUPPORT_PROXY
1303 g = string_cat(g, US" PROXY");
1305 #ifndef DISABLE_QUEUE_RAMP
1306 g = string_cat(g, US" Queue_Ramp");
1308 #ifdef SUPPORT_SOCKS
1309 g = string_cat(g, US" SOCKS");
1312 g = string_cat(g, US" SPF");
1314 #if defined(SUPPORT_SRS)
1315 g = string_cat(g, US" SRS");
1319 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1321 #ifdef EXPERIMENTAL_ARC
1322 g = string_cat(g, US" Experimental_ARC");
1324 #ifdef EXPERIMENTAL_BRIGHTMAIL
1325 g = string_cat(g, US" Experimental_Brightmail");
1327 #ifdef EXPERIMENTAL_DCC
1328 g = string_cat(g, US" Experimental_DCC");
1330 #ifdef EXPERIMENTAL_DSN_INFO
1331 g = string_cat(g, US" Experimental_DSN_info");
1333 #ifdef EXPERIMENTAL_QUEUEFILE
1334 g = string_cat(g, US" Experimental_QUEUEFILE");
1336 #ifdef EXPERIMENTAL_XCLIENT
1337 g = string_cat(g, US" Experimental_XCLIENT");
1339 g = string_cat(g, US"\n");
1341 g = lookup_show_supported(g);
1342 g = auth_show_supported(g);
1343 g = route_show_supported(g);
1344 g = transport_show_supported(g);
1346 #ifdef WITH_CONTENT_SCAN
1347 g = malware_show_supported(g);
1349 show_string(is_stdout, g); g = NULL;
1351 if (fixed_never_users[0] > 0)
1354 g = string_cat(g, US"Fixed never_users: ");
1355 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1356 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1357 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1360 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1362 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1364 /* Everything else is details which are only worth reporting when debugging.
1365 Perhaps the tls_version_report should move into this too. */
1369 /* clang defines __GNUC__ (at least, for me) so test for it first */
1370 #if defined(__clang__)
1371 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1372 #elif defined(__GNUC__)
1374 g = string_fmt_append(g, "Compiler: GCC [%s]\n", __VERSION__);
1376 g = string_fmt_append(g, "Compiler: GCC [%s]\n", "? unknown version ?";
1379 g = string_cat(g, US"Compiler: <unknown>\n");
1382 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1383 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1384 __GLIBC__, __GLIBC_MINOR__);
1385 if (__GLIBC_PREREQ(2, 1))
1386 g = string_fmt_append(g, " Runtime: %s\n",
1387 gnu_get_libc_version());
1390 g = show_db_version(g);
1393 g = tls_version_report(g);
1396 g = utf8_version_report(g);
1399 /*XXX do we need a "show misc-mods version-report" ?
1400 Currently they are output in misc_mod_add() */
1402 show_string(is_stdout, g);
1405 for (auth_info * ai = auths_available; ai; ai = (auth_info *)ai->drinfo.next)
1406 if (ai->version_report)
1407 g = (*ai->version_report)(g);
1409 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1410 characters; unless it's an ancient version of PCRE in which case it
1412 #ifndef PCRE_PRERELEASE
1413 # define PCRE_PRERELEASE
1416 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1419 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1420 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1422 PCRE2_MAJOR, PCRE2_MINOR,
1423 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1427 #undef EXPAND_AND_QUOTE
1429 show_string(is_stdout, g);
1433 tree_walk(lookups_tree, lookup_version_report_cb, &g);
1434 show_string(is_stdout, g);
1436 init_misc_mod_list();
1438 #ifdef WHITELIST_D_MACROS
1439 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1441 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1443 #ifdef TRUSTED_CONFIG_LIST
1444 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1446 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1450 show_string(is_stdout, g);
1451 store_reset(reset_point);
1455 /*************************************************
1456 * Show auxiliary information about Exim *
1457 *************************************************/
1460 show_exim_information(enum commandline_info request, FILE *stream)
1465 fprintf(stream, "Oops, something went wrong.\n");
1469 "The -bI: flag takes a string indicating which information to provide.\n"
1470 "If the string is not recognised, you'll get this help (on stderr).\n"
1472 " exim -bI:help this information\n"
1473 " exim -bI:dscp list of known dscp value keywords\n"
1474 " exim -bI:sieve list of supported sieve extensions\n"
1478 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1479 fprintf(stream, "%s\n", *pp);
1482 dscp_list_to_stream(stream);
1488 /*************************************************
1489 * Quote a local part *
1490 *************************************************/
1492 /* This function is used when a sender address or a From: or Sender: header
1493 line is being created from the caller's login, or from an authenticated_id. It
1494 applies appropriate quoting rules for a local part.
1496 Argument: the local part
1497 Returns: the local part, quoted if necessary
1501 local_part_quote(const uschar * lpart)
1503 BOOL needs_quote = FALSE;
1506 for (const uschar * t = lpart; !needs_quote && *t; t++)
1507 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1508 (*t != '.' || t == lpart || t[1] == 0);
1510 if (!needs_quote) return lpart;
1512 g = string_catn(NULL, US"\"", 1);
1516 uschar * nq = US Ustrpbrk(lpart, "\\\"");
1519 g = string_cat(g, lpart);
1522 g = string_catn(g, lpart, nq - lpart);
1523 g = string_catn(g, US"\\", 1);
1524 g = string_catn(g, nq, 1);
1528 g = string_catn(g, US"\"", 1);
1529 return string_from_gstring(g);
1535 /*************************************************
1536 * Load readline() functions *
1537 *************************************************/
1539 /* This function is called from testing executions that read data from stdin,
1540 but only when running as the calling user. Currently, only -be does this. The
1541 function loads the readline() function library and passes back the functions.
1542 On some systems, it needs the curses library, so load that too, but try without
1543 it if loading fails. All this functionality has to be requested at build time.
1546 fn_readline_ptr pointer to where to put the readline pointer
1547 fn_addhist_ptr pointer to where to put the addhistory function
1549 Returns: the dlopen handle or NULL on failure
1553 set_readline(char * (**fn_readline_ptr)(const char *),
1554 void (**fn_addhist_ptr)(const char *))
1557 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1559 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1560 if (dlhandle_curses) dlclose(dlhandle_curses);
1564 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1565 * char * readline (const char *prompt);
1566 * void add_history (const char *string);
1568 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1569 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1572 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1580 /*************************************************
1581 * Get a line from stdin for testing things *
1582 *************************************************/
1584 /* This function is called when running tests that can take a number of lines
1585 of input (for example, -be and -bt). It handles continuations and trailing
1586 spaces. And prompting and a blank line output on eof. If readline() is in use,
1587 the arguments are non-NULL and provide the relevant functions.
1590 fn_readline readline function or NULL
1591 fn_addhist addhist function or NULL
1593 Returns: pointer to dynamic memory, or NULL at end of file
1597 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1600 BOOL had_input = FALSE;
1602 if (!fn_readline) { printf("> "); fflush(stdout); }
1604 for (int i = 0;; i++)
1606 uschar buffer[1024];
1610 char *readline_line = NULL;
1613 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1614 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1615 p = US readline_line;
1620 /* readline() not in use */
1623 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1627 /* Handle the line */
1630 ss = p + Ustrlen(p);
1631 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1634 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1636 g = string_catn(g, p, ss - p);
1639 if (fn_readline) free(readline_line);
1642 /* g can only be NULL if ss==p */
1643 if (ss == p || gstring_last_char(g) != '\\') /* not continuation; done */
1646 gstring_trim(g, 1); /* drop the \ */
1649 if (had_input) return g ? string_from_gstring(g) : US"";
1656 /*************************************************
1657 * Output usage information for the program *
1658 *************************************************/
1660 /* This function is called when there are no recipients
1661 or a specific --help argument was added.
1664 progname information on what name we were called by
1666 Returns: DOES NOT RETURN
1670 exim_usage(const uschar * progname)
1673 /* Handle specific program invocation variants */
1674 if (Ustrcmp(progname, US"-mailq") == 0)
1676 "mailq - list the contents of the mail queue\n\n"
1677 "For a list of options, see the Exim documentation.\n");
1679 /* Generic usage - we output this whatever happens */
1681 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1682 "not directly from a shell command line. Options and/or arguments control\n"
1683 "what it does when called. For a list of options, see the Exim documentation.\n");
1688 /*************************************************
1689 * Validate that the macros given are okay *
1690 *************************************************/
1692 /* Typically, Exim will drop privileges if macros are supplied. In some
1693 cases, we want to not do so.
1695 Arguments: opt_D_used - true if the commandline had a "-D" option
1696 Returns: true if trusted, false otherwise
1700 macros_trusted(BOOL opt_D_used)
1702 #ifdef WHITELIST_D_MACROS
1703 uschar *whitelisted, *end, *p, **whites;
1704 int white_count, i, n;
1706 BOOL prev_char_item, found;
1711 #ifndef WHITELIST_D_MACROS
1715 /* We only trust -D overrides for some invoking users:
1716 root, the exim run-time user, the optional config owner user.
1717 I don't know why config-owner would be needed, but since they can own the
1718 config files anyway, there's no security risk to letting them override -D. */
1719 if ( ! ((real_uid == root_uid)
1720 || (real_uid == exim_uid)
1721 #ifdef CONFIGURE_OWNER
1722 || (real_uid == config_uid)
1726 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1730 /* Get a list of macros which are whitelisted */
1731 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1732 prev_char_item = FALSE;
1734 for (p = whitelisted; *p != '\0'; ++p)
1736 if (*p == ':' || isspace(*p))
1741 prev_char_item = FALSE;
1744 if (!prev_char_item)
1745 prev_char_item = TRUE;
1752 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1753 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1758 if (i == white_count)
1760 while (*p != '\0' && p < end)
1766 /* The list of commandline macros should be very short.
1767 Accept the N*M complexity. */
1768 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1771 for (uschar ** w = whites; *w; ++w)
1772 if (Ustrcmp(*w, m->name) == 0)
1779 if (!m->replacement)
1781 if ((len = m->replen) == 0)
1783 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1786 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1792 /*************************************************
1793 * Expansion testing *
1794 *************************************************/
1796 /* Expand and print one item, doing macro-processing.
1799 item line for expansion
1803 expansion_test_line(const uschar * line)
1809 Ustrncpy(big_buffer, line, big_buffer_size);
1810 big_buffer[big_buffer_size-1] = '\0';
1811 len = Ustrlen(big_buffer);
1813 (void) macros_expand(0, &len, &dummy_macexp);
1815 #ifdef LOOKUP_MODULE_DIR
1816 //mod_load_check(big_buffer);
1819 if (isupper(big_buffer[0]))
1821 if (macro_read_assignment(big_buffer))
1822 printf("Defined macro '%s'\n", mlast->name);
1824 else if (Ustrncmp(big_buffer, "set,t ", 6) == 0)
1825 printf("%s\n", acl_standalone_setvar(big_buffer+6, TRUE));
1826 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1827 printf("%s\n", acl_standalone_setvar(big_buffer+4, FALSE));
1829 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1830 else printf("Failed: %s\n", expand_string_message);
1835 /*************************************************
1836 * Queue-runner operations *
1837 *************************************************/
1839 /* Prefix a new qrunner descriptor to the qrunners list */
1844 qrunner * q = qrunners;
1845 qrunners = store_get(sizeof(qrunner), GET_UNTAINTED);
1846 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1848 qrunners->next_tick = time(NULL); /* run right away */
1853 alloc_onetime_qrunner(void)
1855 qrunners = store_get_perm(sizeof(qrunner), GET_UNTAINTED);
1856 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1857 qrunners->next_tick = time(NULL); /* run right away */
1858 qrunners->run_max = 1;
1863 /*************************************************
1864 * Entry point and high-level code *
1865 *************************************************/
1867 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1868 the appropriate action. All the necessary functions are present in the one
1869 binary. I originally thought one should split it up, but it turns out that so
1870 much of the apparatus is needed in each chunk that one might as well just have
1871 it all available all the time, which then makes the coding easier as well.
1874 argc count of entries in argv
1875 argv argument strings, with argv[0] being the program name
1877 Returns: EXIT_SUCCESS if terminated successfully
1878 EXIT_FAILURE otherwise, except when a message has been sent
1879 to the sender, and -oee was given
1883 main(int argc, char ** cargv)
1885 const uschar ** argv = CUSS cargv;
1886 int arg_receive_timeout = -1;
1887 int arg_smtp_receive_timeout = -1;
1888 int arg_error_handling = error_handling;
1889 int filter_sfd = -1;
1890 int filter_ufd = -1;
1893 int list_queue_option = QL_BASIC;
1895 int msg_action_arg = -1;
1896 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1897 int queue_only_reason = 0;
1899 int perl_start_option = 0;
1901 int recipients_arg = argc;
1902 int sender_address_domain = 0;
1903 int test_retry_arg = -1;
1904 int test_rewrite_arg = -1;
1905 gid_t original_egid;
1906 BOOL arg_queue_only = FALSE;
1907 BOOL bi_option = FALSE;
1908 BOOL checking = FALSE;
1909 BOOL count_queue = FALSE;
1910 BOOL expansion_test = FALSE;
1911 BOOL extract_recipients = FALSE;
1912 BOOL flag_G = FALSE;
1913 BOOL flag_n = FALSE;
1914 BOOL forced_delivery = FALSE;
1915 BOOL f_end_dot = FALSE;
1916 BOOL deliver_give_up = FALSE;
1917 BOOL list_queue = FALSE;
1918 BOOL list_options = FALSE;
1919 BOOL list_config = FALSE;
1920 BOOL local_queue_only;
1921 BOOL one_msg_action = FALSE;
1922 BOOL opt_D_used = FALSE;
1923 BOOL queue_only_set = FALSE;
1924 BOOL receiving_message = TRUE;
1925 BOOL sender_ident_set = FALSE;
1926 BOOL session_local_queue_only;
1928 BOOL removed_privilege = FALSE;
1929 BOOL usage_wanted = FALSE;
1930 BOOL verify_address_mode = FALSE;
1931 BOOL verify_as_sender = FALSE;
1932 BOOL rcpt_verify_quota = FALSE;
1933 BOOL version_printed = FALSE;
1934 const uschar * alias_arg = NULL;
1935 const uschar * called_as = US"";
1936 const uschar * cmdline_syslog_name = NULL;
1937 const uschar * start_queue_run_id = NULL;
1938 const uschar * stop_queue_run_id = NULL;
1939 const uschar * expansion_test_message = NULL;
1940 const uschar * ftest_domain = NULL;
1941 const uschar * ftest_localpart = NULL;
1942 const uschar * ftest_prefix = NULL;
1943 const uschar * ftest_suffix = NULL;
1944 uschar * log_oneline = NULL;
1945 const uschar * malware_test_file = NULL;
1946 const uschar * real_sender_address;
1947 uschar * originator_home = US"/";
1951 struct stat statbuf;
1952 pid_t passed_qr_pid = (pid_t)0;
1953 int passed_qr_pipe = -1;
1954 gid_t group_list[EXIM_GROUPLIST_SIZE];
1956 /* For the -bI: flag */
1957 enum commandline_info info_flag = CMDINFO_NONE;
1958 BOOL info_stdout = FALSE;
1960 /* Possible options for -R and -S */
1962 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1964 /* Need to define this in case we need to change the environment in order
1965 to get rid of a bogus time zone. We have to make it char rather than uschar
1966 because some OS define it in /usr/include/unistd.h. */
1968 extern char **environ;
1970 #ifdef MEASURE_TIMING
1971 (void)gettimeofday(×tamp_startup, NULL);
1974 store_init(); /* Initialise the memory allocation susbsystem */
1975 pcre_init(); /* Set up memory handling for pcre */
1977 /* If the Exim user and/or group and/or the configuration file owner/group were
1978 defined by ref:name at build time, we must now find the actual uid/gid values.
1979 This is a feature to make the lives of binary distributors easier. */
1981 #ifdef EXIM_USERNAME
1982 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1985 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1987 /* If ref:name uses a number as the name, route_finduser() returns
1988 TRUE with exim_uid set and pw coerced to NULL. */
1990 exim_gid = pw->pw_gid;
1991 #ifndef EXIM_GROUPNAME
1994 "exim: ref:name should specify a usercode, not a group.\n"
1995 "exim: can't let you get away with it unless you also specify a group.\n");
1999 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
2002 #ifdef EXIM_GROUPNAME
2003 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
2004 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
2007 #ifdef CONFIGURE_OWNERNAME
2008 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
2009 exim_fail("exim: failed to find uid for user name \"%s\"\n",
2010 CONFIGURE_OWNERNAME);
2013 /* We default the system_filter_user to be the Exim run-time user, as a
2014 sane non-root value. */
2015 system_filter_uid = exim_uid;
2017 #ifdef CONFIGURE_GROUPNAME
2018 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
2019 exim_fail("exim: failed to find gid for group name \"%s\"\n",
2020 CONFIGURE_GROUPNAME);
2023 /* In the Cygwin environment, some initialization used to need doing.
2024 It was fudged in by means of this macro; now no longer but we'll leave
2025 it in case of others. */
2031 /* Check a field which is patched when we are running Exim within its
2032 testing harness; do a fast initial check, and then the whole thing. */
2034 f.running_in_test_harness =
2035 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
2036 if (f.running_in_test_harness)
2039 /* Protect against abusive argv[0] */
2040 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
2041 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
2043 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
2044 at the start of a program; however, it seems that some environments do not
2045 follow this. A "strange" locale can affect the formatting of timestamps, so we
2048 setlocale(LC_ALL, "C");
2050 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
2052 #ifdef _POSIX_MONOTONIC_CLOCK
2056 /* Set up the default handler for timing using alarm(). */
2058 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2060 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
2061 because store_malloc writes a log entry on failure. */
2063 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
2064 exim_fail("exim: failed to get store for log buffer\n");
2066 /* Initialize the default log options. */
2068 bits_set(log_selector, log_selector_size, log_default);
2070 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
2071 NULL when the daemon is run and the file is closed. We have to use this
2072 indirection, because some systems don't allow writing to the variable "stderr".
2075 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
2077 /* Ensure there is a big buffer for temporary use in several places. It is put
2078 in malloc store so that it can be freed for enlargement if necessary. */
2080 big_buffer = store_malloc(big_buffer_size);
2082 /* Set up the handler for the data request signal, and set the initial
2083 descriptive text. */
2085 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
2086 set_process_info("initializing");
2087 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
2090 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
2091 sigaction(SIGSEGV, &act, NULL);
2094 signal(SIGSEGV, segv_handler); /* log faults */
2097 /* If running in a dockerized environment, the TERM signal is only
2098 delegated to the PID 1 if we request it by setting an signal handler */
2100 if (getpid() == 1) signal(SIGTERM, term_handler);
2102 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
2103 in the daemon code. For the rest of Exim's uses, we ignore it. */
2105 signal(SIGHUP, SIG_IGN);
2107 /* We don't want to die on pipe errors as the code is written to handle
2108 the write error instead. */
2110 signal(SIGPIPE, SIG_IGN);
2112 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
2113 set to SIG_IGN. This causes subprocesses that complete before the parent
2114 process waits for them not to hang around, so when Exim calls wait(), nothing
2115 is there. The wait() code has been made robust against this, but let's ensure
2116 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
2117 ending status. We use sigaction rather than plain signal() on those OS where
2118 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
2119 problem on AIX with this.) */
2123 struct sigaction act;
2124 act.sa_handler = SIG_DFL;
2125 sigemptyset(&(act.sa_mask));
2127 sigaction(SIGCHLD, &act, NULL);
2130 signal(SIGCHLD, SIG_DFL);
2133 /* Save the arguments for use if we re-exec exim as a daemon after receiving
2138 /* Set up the version number. Set up the leading 'E' for the external form of
2139 message ids, set the pointer to the internal form, and initialize it to
2140 indicate no message being processed. */
2143 message_id_option[0] = '-';
2144 message_id_external = message_id_option + 1;
2145 message_id_external[0] = 'E';
2146 message_id = message_id_external + 1;
2149 /* Set the umask to zero so that any files Exim creates using open() are
2150 created with the modes that it specifies. NOTE: Files created with fopen() have
2151 a problem, which was not recognized till rather late (February 2006). With this
2152 umask, such files will be world writeable. (They are all content scanning files
2153 in the spool directory, which isn't world-accessible, so this is not a
2154 disaster, but it's untidy.) I don't want to change this overall setting,
2155 however, because it will interact badly with the open() calls. Instead, there's
2156 now a function called modefopen() that fiddles with the umask while calling
2161 /* Precompile the regular expression for matching a message id. Keep this in
2162 step with the code that generates ids in the accept.c module. We need to do
2163 this here, because the -M options check their arguments for syntactic validity
2164 using mac_ismsgid, which uses this. */
2167 regex_must_compile(US"^(?:"
2168 "[^\\W_]{" str(MESSAGE_ID_TIME_LEN) "}"
2169 "-[^\\W_]{" str(MESSAGE_ID_PID_LEN) "}"
2170 "-[^\\W_]{" str(MESSAGE_ID_SUBTIME_LEN) "}"
2172 "(?:[^\\W_]{6}-){2}[^\\W_]{2}" /* old ID format */
2176 /* Precompile the regular expression that is used for matching an SMTP error
2177 code, possibly extended, at the start of an error message. Note that the
2178 terminating whitespace character is included. */
2181 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2184 #ifdef WHITELIST_D_MACROS
2185 /* Precompile the regular expression used to filter the content of macros
2186 given to -D for permissibility. */
2188 regex_whitelisted_macro =
2189 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2192 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2193 this seems to be a generally accepted convention, since one finds symbolic
2194 links called "mailq" in standard OS configurations. */
2196 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2197 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2200 receiving_message = FALSE;
2201 called_as = US"-mailq";
2204 /* If the program is called as "rmail" treat it as equivalent to
2205 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2206 i.e. preventing a single dot on a line from terminating the message, and
2207 returning with zero return code, even in cases of error (provided an error
2208 message has been sent). */
2210 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2211 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2214 called_as = US"-rmail";
2215 errors_sender_rc = EXIT_SUCCESS;
2218 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2219 this is a smail convention. */
2221 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2222 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2224 smtp_input = smtp_batched_input = TRUE;
2225 called_as = US"-rsmtp";
2228 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2229 this is a smail convention. */
2231 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2232 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2234 alloc_onetime_qrunner();
2235 receiving_message = FALSE;
2236 called_as = US"-runq";
2239 /* If the program is called as "newaliases" treat it as equivalent to
2240 "exim -bi"; this is a sendmail convention. */
2242 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2243 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2246 receiving_message = FALSE;
2247 called_as = US"-newaliases";
2250 /* Save the original effective uid for a couple of uses later. It should
2251 normally be root, but in some esoteric environments it may not be. */
2253 original_euid = geteuid();
2254 original_egid = getegid();
2256 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2257 to be the same as the real ones. This makes a difference only if Exim is setuid
2258 (or setgid) to something other than root, which could be the case in some
2259 special configurations. */
2261 real_uid = getuid();
2262 real_gid = getgid();
2264 if (real_uid == root_uid)
2266 if ((rv = setgid(real_gid)))
2267 exim_fail("exim: setgid(%ld) failed: %s\n",
2268 (long int)real_gid, strerror(errno));
2269 if ((rv = setuid(real_uid)))
2270 exim_fail("exim: setuid(%ld) failed: %s\n",
2271 (long int)real_uid, strerror(errno));
2274 /* If neither the original real uid nor the original euid was root, Exim is
2275 running in an unprivileged state. */
2277 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2279 /* For most of the args-parsing we need to use permanent pool memory */
2281 int old_pool = store_pool;
2282 store_pool = POOL_PERM;
2284 /* Scan the program's arguments. Some can be dealt with right away; others are
2285 simply recorded for checking and handling afterwards. Do a high-level switch
2286 on the second character (the one after '-'), to save some effort. */
2288 for (i = 1; i < argc; i++)
2290 BOOL badarg = FALSE;
2291 const uschar * arg = argv[i];
2292 const uschar * argrest;
2295 /* An argument not starting with '-' is the start of a recipients list;
2296 break out of the options-scanning loop. */
2304 /* An option consisting of -- terminates the options */
2306 if (Ustrcmp(arg, "--") == 0)
2308 recipients_arg = i + 1;
2312 /* Handle flagged options */
2314 switchchar = arg[1];
2317 /* Make all -ex options synonymous with -oex arguments, since that
2318 is assumed by various callers. Also make -qR options synonymous with -R
2319 options, as that seems to be required as well. Allow for -qqR too, and
2320 the same for -S options. */
2322 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2323 Ustrncmp(arg+1, "qR", 2) == 0 ||
2324 Ustrncmp(arg+1, "qS", 2) == 0)
2326 switchchar = arg[2];
2329 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2331 switchchar = arg[3];
2333 f.queue_2stage = TRUE;
2336 /* Make -r synonymous with -f, since it is a documented alias */
2338 else if (arg[1] == 'r') switchchar = 'f';
2340 /* Make -ov synonymous with -v */
2342 else if (Ustrcmp(arg, "-ov") == 0)
2348 /* deal with --option_aliases */
2349 else if (switchchar == '-')
2351 if (Ustrcmp(argrest, "help") == 0)
2353 usage_wanted = TRUE;
2356 else if (Ustrcmp(argrest, "version") == 0)
2363 /* High-level switch on active initial letter */
2368 /* sendmail uses -Ac and -Am to control which .cf file is used;
2371 if (!*argrest) { badarg = TRUE; break; }
2374 BOOL ignore = FALSE;
2379 if (*(argrest + 1) == '\0')
2383 if (!ignore) badarg = TRUE;
2387 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2388 so has no need of it. */
2391 if (!*argrest) i++; /* Skip over the type */
2397 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2401 /* -bd: Run in daemon mode, awaiting SMTP connections.
2402 -bdf: Ditto, but in the foreground.
2405 f.daemon_listen = f.daemon_scion = TRUE;
2406 if (*argrest == 'f') f.background_daemon = FALSE;
2407 else if (*argrest) badarg = TRUE;
2410 /* -be: Run in expansion test mode
2411 -bem: Ditto, but read a message from a file first
2414 expansion_test = checking = TRUE;
2415 if (*argrest == 'm')
2417 if (++i >= argc) { badarg = TRUE; break; }
2418 expansion_test_message = argv[i];
2421 if (*argrest) badarg = TRUE;
2424 /* -bF: Run system filter test */
2426 filter_test |= checking = FTEST_SYSTEM;
2427 if (*argrest) badarg = TRUE;
2428 else if (++i < argc) filter_test_sfile = argv[i];
2429 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2432 /* -bf: Run user filter test
2433 -bfd: Set domain for filter testing
2434 -bfl: Set local part for filter testing
2435 -bfp: Set prefix for filter testing
2436 -bfs: Set suffix for filter testing
2441 filter_test |= checking = FTEST_USER;
2442 if (++i < argc) filter_test_ufile = argv[i];
2443 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2448 exim_fail("exim: string expected after %s\n", arg);
2449 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2450 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2451 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2452 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2457 /* -bh: Host checking - an IP address must follow. */
2459 if ( (!*argrest || Ustrcmp(argrest, "c") == 0)
2462 sender_host_address = string_copy_taint(
2463 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2465 host_checking = checking = f.log_testing_mode = TRUE;
2466 f.host_checking_callout = *argrest == 'c';
2467 message_logs = FALSE;
2473 /* -bi: This option is used by sendmail to initialize *the* alias file,
2474 though it has the -oA option to specify a different file. Exim has no
2475 concept of *the* alias file, but since Sun's YP make script calls
2476 sendmail this way, some support must be provided. */
2478 if (!*argrest) bi_option = TRUE;
2482 /* -bI: provide information, of the type to follow after a colon.
2483 This is an Exim flag. */
2485 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2487 const uschar * p = argrest+1;
2488 info_flag = CMDINFO_HELP;
2490 if (strcmpic(p, CUS"sieve") == 0)
2492 info_flag = CMDINFO_SIEVE;
2495 else if (strcmpic(p, CUS"dscp") == 0)
2497 info_flag = CMDINFO_DSCP;
2500 else if (strcmpic(p, CUS"help") == 0)
2506 /* -bm: Accept and deliver message - the default option. Reinstate
2507 receiving_message, which got turned off for all -b options.
2508 -bmalware: test the filename given for malware */
2510 if (!*argrest) receiving_message = TRUE;
2511 else if (Ustrcmp(argrest, "alware") == 0)
2513 if (++i >= argc) { badarg = TRUE; break; }
2515 malware_test_file = argv[i];
2520 /* -bnq: For locally originating messages, do not qualify unqualified
2521 addresses. In the envelope, this causes errors; in header lines they
2524 if (Ustrcmp(argrest, "q") == 0)
2526 f.allow_unqualified_sender = FALSE;
2527 f.allow_unqualified_recipient = FALSE;
2532 /* -bpxx: List the contents of the mail queue, in various forms. If
2533 the option is -bpc, just a queue count is needed. Otherwise, if the
2534 first letter after p is r, then order is random. */
2536 if (*argrest == 'c')
2539 if (*++argrest) badarg = TRUE;
2543 if (*argrest == 'r')
2544 list_queue_option = QL_UNSORTED, argrest++;
2546 list_queue_option = QL_BASIC;
2550 /* -bp: List the contents of the mail queue, top-level only */
2554 /* -bpu: List the contents of the mail queue, top-level undelivered */
2556 else if (Ustrcmp(argrest, "u") == 0) list_queue_option |= QL_UNDELIVERED_ONLY;
2558 /* -bpa: List the contents of the mail queue, including all delivered */
2560 else if (Ustrcmp(argrest, "a") == 0) list_queue_option |= QL_PLUS_GENERATED;
2562 /* -bpi: List only message IDs */
2564 else if (Ustrcmp(argrest, "i") == 0) list_queue_option |= QL_MSGID_ONLY;
2566 /* Unknown after -bp[r] */
2572 /* -bP: List the configuration variables given as the address list.
2573 Force -v, so configuration errors get displayed. */
2576 /* -bP config: we need to setup here, because later,
2577 when list_options is checked, the config is read already */
2580 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2583 readconf_save_config(version_string);
2587 list_options = TRUE;
2588 debug_selector |= D_v;
2589 debug_file = stderr;
2593 /* -brt: Test retry configuration lookup */
2595 if (Ustrcmp(argrest, "t") == 0)
2598 test_retry_arg = i + 1;
2602 /* -brw: Test rewrite configuration */
2604 else if (Ustrcmp(argrest, "w") == 0)
2607 test_rewrite_arg = i + 1;
2613 /* -bS: Read SMTP commands on standard input, but produce no replies -
2614 all errors are reported by sending messages. */
2617 smtp_input = smtp_batched_input = receiving_message = TRUE;
2621 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2622 on standard output. */
2624 if (!*argrest) smtp_input = receiving_message = TRUE;
2628 /* -bt: address testing mode */
2631 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2635 /* -bv: verify addresses */
2638 verify_address_mode = checking = f.log_testing_mode = TRUE;
2640 /* -bvs: verify sender addresses */
2642 else if (Ustrcmp(argrest, "s") == 0)
2644 verify_address_mode = checking = f.log_testing_mode = TRUE;
2645 verify_as_sender = TRUE;
2650 /* -bV: Print version string and support details */
2654 printf("Exim version %s #%s built %s\n", version_string,
2655 version_cnumber, version_date);
2656 printf("%s\n", CS version_copyright);
2657 version_printed = TRUE;
2658 show_whats_supported(TRUE);
2659 f.log_testing_mode = TRUE;
2664 /* -bw: inetd wait mode, accept a listening socket as stdin */
2666 f.inetd_wait_mode = TRUE;
2667 f.background_daemon = FALSE;
2668 f.daemon_listen = f.daemon_scion = TRUE;
2670 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2671 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2682 /* -C: change configuration file list; ignore if it isn't really
2683 a change! Enforce a prefix check if required. */
2687 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2688 if (Ustrcmp(config_main_filelist, argrest) != 0)
2690 #ifdef ALT_CONFIG_PREFIX
2692 int len = Ustrlen(ALT_CONFIG_PREFIX);
2693 const uschar *list = argrest;
2695 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2696 while((filename = string_nextinlist(&list, &sep, big_buffer,
2698 if ( ( Ustrlen(filename) < len
2699 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2700 || Ustrstr(filename, "/../") != NULL
2702 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2704 exim_fail("-C Permission denied\n");
2706 if (real_uid != root_uid)
2708 #ifdef TRUSTED_CONFIG_LIST
2710 if (real_uid != exim_uid
2711 #ifdef CONFIGURE_OWNER
2712 && real_uid != config_uid
2715 f.trusted_config = FALSE;
2718 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2721 struct stat statbuf;
2723 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2724 (statbuf.st_uid != root_uid /* owner not root */
2725 #ifdef CONFIGURE_OWNER
2726 && statbuf.st_uid != config_uid /* owner not the special one */
2729 (statbuf.st_gid != root_gid /* group not root */
2730 #ifdef CONFIGURE_GROUP
2731 && statbuf.st_gid != config_gid /* group not the special one */
2733 && (statbuf.st_mode & 020) != 0 /* group writeable */
2735 (statbuf.st_mode & 2) != 0) /* world writeable */
2737 f.trusted_config = FALSE;
2742 /* Well, the trust list at least is up to scratch... */
2744 uschar *trusted_configs[32];
2747 int old_pool = store_pool;
2748 store_pool = POOL_MAIN;
2750 reset_point = store_mark();
2751 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2753 uschar * start = big_buffer, * nl;
2754 if (Uskip_whitespace(&start) != '/')
2756 if ((nl = Ustrchr(start, '\n')))
2758 trusted_configs[nr_configs++] = string_copy(start);
2759 if (nr_configs == nelem(trusted_configs))
2767 const uschar *list = argrest;
2769 while (f.trusted_config && (filename = string_nextinlist(&list,
2770 &sep, big_buffer, big_buffer_size)))
2772 for (i=0; i < nr_configs; i++)
2773 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2775 if (i == nr_configs)
2777 f.trusted_config = FALSE;
2782 else /* No valid prefixes found in trust_list file. */
2783 f.trusted_config = FALSE;
2784 store_reset(reset_point);
2785 store_pool = old_pool;
2788 else /* Could not open trust_list file. */
2789 f.trusted_config = FALSE;
2792 /* Not root; don't trust config */
2793 f.trusted_config = FALSE;
2797 config_main_filelist = argrest;
2798 f.config_changed = TRUE;
2803 /* -D: set up a macro definition */
2806 #ifdef DISABLE_D_OPTION
2807 exim_fail("exim: -D is not available in this Exim binary\n");
2813 const uschar * s = argrest;
2816 Uskip_whitespace(&s);
2818 if (*s < 'A' || *s > 'Z')
2819 exim_fail("exim: macro name set by -D must start with "
2820 "an upper case letter\n");
2822 while (isalnum(*s) || *s == '_')
2824 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2828 if (ptr == 0) { badarg = TRUE; break; }
2829 if (Uskip_whitespace(&s))
2831 if (*s++ != '=') { badarg = TRUE; break; }
2832 Uskip_whitespace(&s);
2835 for (m = macros_user; m; m = m->next)
2836 if (Ustrcmp(m->name, name) == 0)
2837 exim_fail("exim: duplicated -D in command line\n");
2839 m = macro_create(name, s, TRUE);
2841 if (clmacro_count >= MAX_CLMACROS)
2842 exim_fail("exim: too many -D options on command line\n");
2843 clmacros[clmacro_count++] =
2844 string_sprintf("-D%s=%s", m->name, m->replacement);
2851 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2853 if (Ustrcmp(argrest, "ropcr") == 0)
2855 /* drop_cr = TRUE; */
2858 /* -dp: Set up a debug pretrigger buffer with given size. */
2860 else if (Ustrcmp(argrest, "p") == 0)
2864 debug_pretrigger_setup(argv[i]);
2866 /* -dt: Set a debug trigger selector */
2868 else if (Ustrncmp(argrest, "t=", 2) == 0)
2869 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2871 /* -d: Set debug level (see also -v below).
2872 If -dd is used, debugging subprocesses of the daemon is disabled. */
2876 /* Use an intermediate variable so that we don't set debugging while
2877 decoding the debugging bits. */
2879 unsigned int selector = D_default;
2882 if (*argrest == 'd')
2884 f.debug_daemon = TRUE;
2888 decode_bits(&selector, 1, debug_notall, argrest,
2889 debug_options, debug_options_count, US"debug", 0);
2890 debug_selector = selector;
2895 /* -E: This is a local error message. This option is not intended for
2896 external use at all, but is not restricted to trusted callers because it
2897 does no harm (just suppresses certain error messages) and if Exim is run
2898 not setuid root it won't always be trusted when it generates error
2899 messages using this option. If there is a message id following -E, point
2900 message_reference at it, for logging. */
2903 f.local_error_message = TRUE;
2904 if (mac_ismsgid(argrest)) message_reference = argrest;
2908 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2909 option, so it looks as if historically the -oex options are also callable
2910 without the leading -o. So we have to accept them. Before the switch,
2911 anything starting -oe has been converted to -e. Exim does not support all
2912 of the sendmail error options. */
2915 if (Ustrcmp(argrest, "e") == 0)
2917 arg_error_handling = ERRORS_SENDER;
2918 errors_sender_rc = EXIT_SUCCESS;
2920 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2921 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2922 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2923 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2928 /* -F: Set sender's full name, used instead of the gecos entry from
2929 the password file. Since users can usually alter their gecos entries,
2930 there's no security involved in using this instead. The data can follow
2931 the -F or be in the next argument. */
2935 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2936 originator_name = string_copy_taint(
2937 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2939 f.sender_name_forced = TRUE;
2943 /* -f: Set sender's address - this value is only actually used if Exim is
2944 run by a trusted user, or if untrusted_set_sender is set and matches the
2945 address, except that the null address can always be set by any user. The
2946 test for this happens later, when the value given here is ignored when not
2947 permitted. For an untrusted user, the actual sender is still put in Sender:
2948 if it doesn't match the From: header (unless no_local_from_check is set).
2949 The data can follow the -f or be in the next argument. The -r switch is an
2950 obsolete form of -f but since there appear to be programs out there that
2951 use anything that sendmail has ever supported, better accept it - the
2952 synonymizing is done before the switch above.
2954 At this stage, we must allow domain literal addresses, because we don't
2955 know what the setting of allow_domain_literals is yet. Ditto for trailing
2956 dots and strip_trailing_dot. */
2960 int dummy_start, dummy_end;
2963 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2964 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2967 uschar * s = store_get(1, GET_UNTAINTED); /* Ensure writeable memory */
2973 const uschar * temp = argrest + Ustrlen(argrest) - 1;
2974 while (temp >= argrest && isspace(*temp)) temp--;
2975 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2976 allow_domain_literals = TRUE;
2977 strip_trailing_dot = TRUE;
2979 allow_utf8_domains = TRUE;
2981 if (!(sender_address = parse_extract_address(argrest, &errmess,
2982 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2983 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2985 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2987 message_smtputf8 = string_is_utf8(sender_address);
2988 allow_utf8_domains = FALSE;
2990 allow_domain_literals = FALSE;
2991 strip_trailing_dot = FALSE;
2993 f.sender_address_forced = TRUE;
2997 /* -G: sendmail invocation to specify that it's a gateway submission and
2998 sendmail may complain about problems instead of fixing them.
2999 We make it equivalent to an ACL "control = suppress_local_fixups" and do
3000 not at this time complain about problems. */
3006 /* -h: Set the hop count for an incoming message. Exim does not currently
3007 support this; it always computes it by counting the Received: headers.
3008 To put it in will require a change to the spool header file format. */
3012 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3013 if (!isdigit(*argrest)) badarg = TRUE;
3017 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
3018 not to be documented for sendmail but mailx (at least) uses it) */
3021 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
3025 /* -L: set the identifier used for syslog; equivalent to setting
3026 syslog_processname in the config file, but needs to be an admin option. */
3030 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3031 if ((sz = Ustrlen(argrest)) > 32)
3032 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
3034 exim_fail("exim: the -L syslog name is too short\n");
3035 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
3039 receiving_message = FALSE;
3041 /* -MC: continue delivery of another message via an existing open
3042 file descriptor. This option is used for an internal call by the
3043 smtp transport when there is a pending message waiting to go to an
3044 address to which it has got a connection. Five subsequent arguments are
3045 required: transport name, host name, IP address, sequence number, and
3046 message_id. Transports may decline to create new processes if the sequence
3047 number gets too big. The channel is stdin. This (-MC) must be the last
3048 argument. There's a subsequent check that the real-uid is privileged.
3050 If we are running in the test harness. delay for a bit, to let the process
3051 that set this one up complete. This makes for repeatability of the logging,
3054 if (Ustrcmp(argrest, "C") == 0)
3056 union sockaddr_46 interface_sock;
3057 EXIM_SOCKLEN_T size = sizeof(interface_sock);
3060 exim_fail("exim: too many or too few arguments after -MC\n");
3062 if (msg_action_arg >= 0)
3063 exim_fail("exim: incompatible arguments\n");
3065 continue_transport = string_copy_taint(
3066 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
3068 continue_hostname = string_copy_taint(
3069 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
3071 continue_host_address = string_copy_taint(
3072 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
3074 continue_sequence = Uatoi(argv[++i]);
3075 msg_action = MSG_DELIVER;
3076 msg_action_arg = ++i;
3077 forced_delivery = TRUE;
3078 queue_run_pid = passed_qr_pid;
3079 queue_run_pipe = passed_qr_pipe;
3081 if (!mac_ismsgid(argv[i]))
3082 exim_fail("exim: malformed message id %s after -MC option\n",
3085 /* Set up $sending_ip_address and $sending_port, unless proxied */
3087 if (!continue_proxy_cipher)
3088 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
3090 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
3093 exim_fail("exim: getsockname() failed after -MC option: %s\n",
3096 testharness_pause_ms(500);
3100 else if (*argrest == 'C' && argrest[1] && !argrest[2])
3104 /* -MCA: set the smtp_authenticated flag; this is useful only when it
3105 precedes -MC (see above). The flag indicates that the host to which
3106 Exim is connected has accepted an AUTH sequence. */
3108 case 'A': f.smtp_authenticated = TRUE; break;
3110 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
3111 that exim is connected to supports the esmtp extension DSN */
3113 case 'D': smtp_peer_options |= OPTION_DSN; break;
3115 /* -MCd: for debug, set a process-purpose string */
3117 case 'd': if (++i < argc)
3118 process_purpose = string_copy_taint(
3119 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
3124 /* -MCG: set the queue name, to a non-default value. Arguably, anything
3125 from the commandline should be tainted - but we will need an untainted
3126 value for the spoolfile when doing a -odi delivery process. */
3128 case 'G': if (++i < argc) queue_name = string_copy_taint(
3129 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
3134 /* -MCK: the peer offered CHUNKING. Must precede -MC */
3136 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
3138 #ifndef DISABLE_ESMTP_LIMITS
3139 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
3140 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
3142 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
3144 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
3149 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
3150 it preceded -MC (see above) */
3152 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3154 #ifdef SUPPORT_SOCKS
3155 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3156 case 'p': proxy_session = TRUE;
3159 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3162 proxy_local_port = Uatoi(argv[i]);
3165 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3168 proxy_external_port = Uatoi(argv[i]);
3174 /* -MCQ: pass on the pid of the queue-running process that started
3175 this chain of deliveries and the fd of its synchronizing pipe; this
3176 is useful only when it precedes -MC (see above) */
3178 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3180 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3184 /* -MCq: do a quota check on the given recipient for the given size
3185 of message. Separate from -MC. */
3186 case 'q': rcpt_verify_quota = TRUE;
3187 if (++i < argc) message_size = Uatoi(argv[i]);
3191 /* -MCS: set the smtp_use_size flag; this is useful only when it
3192 precedes -MC (see above) */
3194 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3197 /* -MCs: used with -MCt; SNI was sent */
3198 /* -MCr: ditto, DANE */
3201 case 's': if (++i < argc)
3203 continue_proxy_sni = string_copy_taint(
3204 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3206 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3211 /* -MCt: similar to -MCT below but the connection is still open
3212 via a proxy process which handles the TLS context and coding.
3213 Require three arguments for the proxied local address and port,
3214 and the TLS cipher. */
3216 case 't': if (++i < argc)
3217 sending_ip_address = string_copy_taint(
3218 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3222 sending_port = (int)(Uatol(argv[i]));
3225 continue_proxy_cipher = string_copy_taint(
3226 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3231 /* -MCT: set the tls_offered flag; this is useful only when it
3232 precedes -MC (see above). The flag indicates that the host to which
3233 Exim is connected has offered TLS support. */
3235 case 'T': smtp_peer_options |= OPTION_TLS; break;
3238 default: badarg = TRUE; break;
3243 /* -M[x]: various operations on the following list of message ids:
3244 -M deliver the messages, ignoring next retry times and thawing
3245 -Mc deliver the messages, checking next retry times, no thawing
3246 -Mf freeze the messages
3247 -Mg give up on the messages
3248 -Mt thaw the messages
3249 -Mrm remove the messages
3250 In the above cases, this must be the last option. There are also the
3251 following options which are followed by a single message id, and which
3252 act on that message. Some of them use the "recipient" addresses as well.
3253 -Mar add recipient(s)
3254 -MG move to a different queue
3255 -Mmad mark all recipients delivered
3256 -Mmd mark recipients(s) delivered
3258 -Mset load a message for use with -be
3260 -Mvc show copy (of whole message, in RFC 2822 format)
3267 msg_action = MSG_DELIVER;
3268 forced_delivery = f.deliver_force_thaw = TRUE;
3270 else if (Ustrcmp(argrest, "ar") == 0)
3272 msg_action = MSG_ADD_RECIPIENT;
3273 one_msg_action = TRUE;
3275 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3276 else if (Ustrcmp(argrest, "es") == 0)
3278 msg_action = MSG_EDIT_SENDER;
3279 one_msg_action = TRUE;
3281 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3282 else if (Ustrcmp(argrest, "g") == 0)
3284 msg_action = MSG_DELIVER;
3285 deliver_give_up = TRUE;
3287 else if (Ustrcmp(argrest, "G") == 0)
3289 msg_action = MSG_SETQUEUE;
3290 queue_name_dest = string_copy_taint(
3291 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3292 EXIM_DRIVERNAME_MAX, "-MG"),
3295 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3296 else if (Ustrcmp(argrest, "md") == 0)
3298 msg_action = MSG_MARK_DELIVERED;
3299 one_msg_action = TRUE;
3301 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3302 else if (Ustrcmp(argrest, "set") == 0)
3304 msg_action = MSG_LOAD;
3305 one_msg_action = TRUE;
3307 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3308 else if (Ustrcmp(argrest, "vb") == 0)
3310 msg_action = MSG_SHOW_BODY;
3311 one_msg_action = TRUE;
3313 else if (Ustrcmp(argrest, "vc") == 0)
3315 msg_action = MSG_SHOW_COPY;
3316 one_msg_action = TRUE;
3318 else if (Ustrcmp(argrest, "vh") == 0)
3320 msg_action = MSG_SHOW_HEADER;
3321 one_msg_action = TRUE;
3323 else if (Ustrcmp(argrest, "vl") == 0)
3325 msg_action = MSG_SHOW_LOG;
3326 one_msg_action = TRUE;
3328 else { badarg = TRUE; break; }
3330 /* All the -Mxx options require at least one message id. */
3332 msg_action_arg = i + 1;
3333 if (msg_action_arg >= argc)
3334 exim_fail("exim: no message ids given after %s option\n", arg);
3336 /* Some require only message ids to follow */
3338 if (!one_msg_action)
3340 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3341 exim_fail("exim: malformed message id %s after %s option\n",
3343 goto END_ARG; /* Remaining args are ids */
3346 /* Others require only one message id, possibly followed by addresses,
3347 which will be handled as normal arguments. */
3351 if (!mac_ismsgid(argv[msg_action_arg]))
3352 exim_fail("exim: malformed message id %s after %s option\n",
3353 argv[msg_action_arg], arg);
3359 /* Some programs seem to call the -om option without the leading o;
3360 for sendmail it askes for "me too". Exim always does this. */
3363 if (*argrest) badarg = TRUE;
3367 /* -N: don't do delivery - a debugging option that stops transports doing
3368 their thing. It implies debugging at the D_v level. */
3373 f.dont_deliver = TRUE;
3374 debug_selector |= D_v;
3375 debug_file = stderr;
3381 /* -n: This means "don't alias" in sendmail, apparently.
3382 For normal invocations, it has no effect.
3383 It may affect some other options. */
3389 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3390 option to the specified value. This form uses long names. We need to handle
3391 -O option=value and -Ooption=value. */
3396 exim_fail("exim: string expected after -O\n");
3402 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3405 if (!*(alias_arg = argrest))
3406 if (i+1 < argc) alias_arg = argv[++i];
3407 else exim_fail("exim: string expected after -oA\n");
3410 /* -oB: Set a connection message max value for remote deliveries */
3413 const uschar * p = argrest;
3415 if (i+1 < argc && isdigit((argv[i+1][0])))
3419 connection_max_messages = 1;
3426 exim_fail("exim: number expected after -oB\n");
3427 connection_max_messages = Uatoi(p);
3432 /* -odb: background delivery */
3435 if (Ustrcmp(argrest, "b") == 0)
3437 f.synchronous_delivery = FALSE;
3438 arg_queue_only = FALSE;
3439 queue_only_set = TRUE;
3442 /* -odd: testsuite-only: add no inter-process delays */
3444 else if (Ustrcmp(argrest, "d") == 0)
3445 f.testsuite_delays = FALSE;
3447 /* -odf: foreground delivery (smail-compatible option); same effect as
3448 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3451 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3453 f.synchronous_delivery = TRUE;
3454 arg_queue_only = FALSE;
3455 queue_only_set = TRUE;
3458 /* -odq: queue only */
3460 else if (Ustrcmp(argrest, "q") == 0)
3462 f.synchronous_delivery = FALSE;
3463 arg_queue_only = TRUE;
3464 queue_only_set = TRUE;
3467 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3468 but no remote delivery */
3470 else if (Ustrcmp(argrest, "qs") == 0)
3472 f.queue_smtp = TRUE;
3473 arg_queue_only = FALSE;
3474 queue_only_set = TRUE;
3479 /* -oex: Sendmail error flags. As these are also accepted without the
3480 leading -o prefix, for compatibility with vacation and other callers,
3481 they are handled with -e above. */
3483 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3484 -oitrue: Another sendmail syntax for the same */
3487 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3492 /* -oM*: Set various characteristics for an incoming message; actually
3493 acted on for trusted callers only. */
3498 exim_fail("exim: data expected after -oM%s\n", argrest);
3500 /* -oMa: Set sender host address */
3502 if (Ustrcmp(argrest, "a") == 0)
3503 sender_host_address = string_copy_taint(
3504 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3505 EXIM_IPADDR_MAX, "-oMa"), GET_TAINTED);
3507 /* -oMaa: Set authenticator name */
3509 else if (Ustrcmp(argrest, "aa") == 0)
3510 sender_host_authenticated = string_copy_taint(
3511 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3512 EXIM_DRIVERNAME_MAX, "-oMaa"), GET_TAINTED);
3514 /* -oMas: setting authenticated sender */
3516 else if (Ustrcmp(argrest, "as") == 0)
3517 authenticated_sender = string_copy_taint(
3518 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3519 EXIM_EMAILADDR_MAX, "-oMas"), GET_TAINTED);
3521 /* -oMai: setting authenticated id */
3523 else if (Ustrcmp(argrest, "ai") == 0)
3524 authenticated_id = string_copy_taint(
3525 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3526 EXIM_EMAILADDR_MAX, "-oMai"), GET_TAINTED);
3528 /* -oMi: Set incoming interface address */
3530 else if (Ustrcmp(argrest, "i") == 0)
3531 interface_address = string_copy_taint(
3532 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3533 EXIM_IPADDR_MAX, "-oMi"), GET_TAINTED);
3535 /* -oMm: Message reference */
3537 else if (Ustrcmp(argrest, "m") == 0)
3539 if (!mac_ismsgid(argv[i+1]))
3540 exim_fail("-oMm must be a valid message ID\n");
3541 if (!f.trusted_config)
3542 exim_fail("-oMm must be called by a trusted user/config\n");
3543 message_reference = next_argv(argv, &i, argc, arg);
3546 /* -oMr: Received protocol */
3548 else if (Ustrcmp(argrest, "r") == 0)
3550 if (received_protocol)
3551 exim_fail("received_protocol is set already\n");
3553 if (++i >= argc) badarg = TRUE;
3555 received_protocol = string_copy_taint(
3556 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-oMr"),
3559 /* -oMs: Set sender host name */
3561 else if (Ustrcmp(argrest, "s") == 0)
3562 if (++i >= argc) badarg = TRUE;
3564 sender_host_name = string_copy_taint(
3565 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-oMs"),
3568 /* -oMt: Set sender ident */
3570 else if (Ustrcmp(argrest, "t") == 0)
3571 if (++i >= argc) badarg = TRUE;
3574 sender_ident_set = TRUE;
3575 sender_ident = string_copy_taint(
3576 exim_str_fail_toolong(argv[i], EXIM_IDENTUSER_MAX, "-oMt"),
3580 /* Else a bad argument */
3587 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3588 seem to call this as -m (undocumented), so that is also accepted (see
3590 /* -oo: An ancient flag for old-style addresses which still seems to
3591 crop up in some calls (see in SCO). */
3595 if (*argrest) badarg = TRUE;
3598 /* -oP <name>: set pid file path for daemon
3599 -oPX: delete pid file of daemon */
3602 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3603 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3604 "(uid=%d euid=%d | %d)\n",
3605 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3607 if (++i < argc) override_pid_file_path = argv[i];
3609 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3614 /* -or <n>: set timeout for non-SMTP acceptance
3615 -os <n>: set timeout for SMTP acceptance */
3620 int * tp = argrest[-1] == 'r'
3621 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3623 *tp = readconf_readtime(argrest, 0, FALSE);
3624 else if (i+1 < argc)
3625 *tp = readconf_readtime(argv[++i], 0, FALSE);
3628 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3632 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3633 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3636 if (*argrest || ++i >= argc) badarg = TRUE;
3637 else override_local_interfaces = string_copy_taint(
3638 exim_str_fail_toolong(argv[i], 1024, "-oX"), GET_TAINTED);
3641 /* -oY: Override creation of daemon notifier socket */
3644 if (*argrest) badarg = TRUE;
3645 else f.notifier_socket_en = FALSE;
3648 /* Unknown -o argument */
3656 /* -ps: force Perl startup; -pd force delayed Perl startup */
3660 if (*argrest == 's' && argrest[1] == 0)
3662 perl_start_option = 1;
3665 if (*argrest == 'd' && argrest[1] == 0)
3667 perl_start_option = -1;
3672 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3673 which sets the host protocol and host name */
3676 argrest = next_argv(argv, &i, argc, arg);
3680 uschar * hn = Ustrchr(argrest, ':');
3682 if (received_protocol)
3683 exim_fail("received_protocol is set already\n");
3686 received_protocol = string_copy_taint(
3687 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3691 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3692 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3693 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3698 /* -q: set up queue runs */
3702 BOOL two_stage, first_del, force, thaw = FALSE, local;
3704 receiving_message = FALSE;
3706 /* -qq...: Do queue runs in a 2-stage manner */
3708 if ((two_stage = *argrest == 'q'))
3711 /* -qi...: Do only first (initial) deliveries */
3713 if ((first_del = *argrest == 'i'))
3716 /* -qf...: Run the queue, forcing deliveries
3717 -qff..: Ditto, forcing thawing as well */
3719 if ((force = *argrest == 'f'))
3720 if ((thaw = *++argrest == 'f'))
3723 /* -q[f][f]l...: Run the queue only on local deliveries */
3725 if ((local = *argrest == 'l'))
3728 /* -q[f][f][l][G<name>]... Work on the named queue */
3730 if (*argrest == 'G')
3733 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3734 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3735 queue_name = string_copyn(argrest, i);
3737 if (*argrest == '/') argrest++;
3740 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3741 only, optionally named, optionally starting from a given message id. */
3743 if (!(list_queue || count_queue))
3748 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3750 q = alloc_onetime_qrunner();
3751 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3752 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3753 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3754 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3757 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3758 forced, optionally local only, optionally named. */
3765 if (*argrest) s = argrest;
3766 else if (++i < argc) { badarg = TRUE; break; }
3769 if ((intvl = readconf_readtime(s, 0, FALSE)) <= 0)
3770 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3772 for (qrunner * qq = qrunners; qq; qq = qq->next)
3773 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3774 || !queue_name && !qq->name)
3775 exim_fail("exim: queue-runner specified more than once\n");
3777 q = alloc_qrunner();
3778 q->interval = intvl;
3781 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3782 q->queue_run_force = force;
3783 q->deliver_force_thaw = thaw;
3784 q->queue_run_first_delivery = first_del;
3785 q->queue_run_local = local;
3786 q->queue_2stage = two_stage;
3793 case 'R': /* Synonymous with -qR... */
3794 case 'S': /* Synonymous with -qS... */
3796 const uschar * tainted_selectstr;
3799 receiving_message = FALSE;
3801 /* -Rf: As -R (below) but force all deliveries,
3802 -Rff: Ditto, but also thaw all frozen messages,
3803 -Rr: String is regex
3804 -Rrf: Regex and force
3805 -Rrff: Regex and force and thaw
3807 -S...: Like -R but works on sender.
3809 in all cases provided there are no further characters in this
3812 if (!qrunners) alloc_onetime_qrunner();
3813 qrunners->queue_2stage = f.queue_2stage;
3815 for (int i = 0; i < nelem(rsopts); i++)
3816 if (Ustrcmp(argrest, rsopts[i]) == 0)
3818 if (i != 2) qrunners->queue_run_force = TRUE;
3820 if (switchchar == 'R')
3821 f.deliver_selectstring_regex = TRUE;
3823 f.deliver_selectstring_sender_regex = TRUE;
3824 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3825 argrest += Ustrlen(rsopts[i]);
3828 /* -R or -S: Set string to match in addresses for forced queue run to
3829 pick out particular messages. */
3831 /* Avoid attacks from people providing very long strings, and do so before
3834 tainted_selectstr = argrest;
3835 else if (i+1 < argc)
3836 tainted_selectstr = argv[++i];
3838 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3840 s = string_copy_taint(
3841 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3844 if (switchchar == 'R')
3845 deliver_selectstring = s;
3847 deliver_selectstring_sender = s;
3852 /* -r: an obsolete synonym for -f (see above) */
3854 /* -Tqt is an option that is exclusively for use by the testing suite.
3855 It is not recognized in other circumstances. It allows for the setting up
3856 of explicit "queue times" so that various warning/retry things can be
3857 tested. Otherwise variability of clock ticks etc. cause problems. */
3860 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0 && ++i < argc)
3861 fudged_queue_times = string_copy_taint(argv[i], GET_TAINTED);
3866 /* -t: Set flag to extract recipients from body of message. */
3869 if (!*argrest) extract_recipients = TRUE;
3871 /* -ti: Set flag to extract recipients from body of message, and also
3872 specify that dot does not end the message. */
3874 else if (Ustrcmp(argrest, "i") == 0)
3876 extract_recipients = TRUE;
3880 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3883 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3890 /* -U: This means "initial user submission" in sendmail, apparently. The
3891 doc claims that in future sendmail may refuse syntactically invalid
3892 messages instead of fixing them. For the moment, we just ignore it. */
3898 /* -v: verify things - this is a very low-level debugging */
3903 debug_selector |= D_v;
3904 debug_file = stderr;
3910 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3912 The -x flag tells the sendmail command that mail from a local
3913 mail program has National Language Support (NLS) extended characters
3914 in the body of the mail item. The sendmail command can send mail with
3915 extended NLS characters across networks that normally corrupts these
3918 As Exim is 8-bit clean, it just ignores this flag. */
3921 if (*argrest) badarg = TRUE;
3924 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3925 logs to that file. We swallow the parameter and otherwise ignore it. */
3930 exim_fail("exim: string expected after -X\n");
3933 /* -z: a line of text to log */
3938 log_oneline = string_copy_taint(
3939 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3942 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3945 /* All other initial characters are errors */
3950 } /* End of high-level switch statement */
3952 /* Failed to recognize the option, or syntax error */
3955 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3956 "option %s\n", arg);
3960 /* If -R or -S have been specified without -q, assume a single queue run. */
3962 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3963 alloc_onetime_qrunner();
3967 store_pool = old_pool;
3970 /* If usage_wanted is set we call the usage function - which never returns */
3971 if (usage_wanted) exim_usage(called_as);
3973 /* Arguments have been processed. Check for incompatibilities. */
3974 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3975 && ( f.daemon_listen || qrunners || bi_option
3976 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3977 || filter_test != FTEST_NONE
3978 || msg_action_arg > 0 && !one_msg_action
3980 || ( msg_action_arg > 0
3981 && ( f.daemon_listen || is_multiple_qrun() || list_options
3982 || checking && msg_action != MSG_LOAD
3983 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3985 || ( (f.daemon_listen || is_multiple_qrun())
3986 && ( sender_address || list_options || list_queue || checking
3989 || f.daemon_listen && is_onetime_qrun()
3990 || f.inetd_wait_mode && qrunners
3992 && ( checking || smtp_input || extract_recipients
3993 || filter_test != FTEST_NONE || bi_option
3995 || ( verify_address_mode
3996 && ( f.address_test_mode || smtp_input || extract_recipients
3997 || filter_test != FTEST_NONE || bi_option
3999 || ( f.address_test_mode
4000 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
4004 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
4006 || deliver_selectstring && !qrunners
4007 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
4009 exim_fail("exim: incompatible command-line options or arguments\n");
4011 /* If debugging is set up, set the file and the file descriptor to pass on to
4012 child processes. It should, of course, be 2 for stderr. Also, force the daemon
4013 to run in the foreground. */
4015 if (debug_selector != 0)
4017 debug_file = stderr;
4018 debug_fd = fileno(debug_file);
4019 f.background_daemon = FALSE;
4020 testharness_pause_ms(100); /* lets caller finish */
4021 if (debug_selector != D_v) /* -v only doesn't show this */
4023 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
4024 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
4026 if (!version_printed)
4027 show_whats_supported(FALSE);
4031 /* When started with root privilege, ensure that the limits on the number of
4032 open files and the number of processes (where that is accessible) are
4033 sufficiently large, or are unset, in case Exim has been called from an
4034 environment where the limits are screwed down. Not all OS have the ability to
4035 change some of these limits. */
4039 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
4045 #ifdef RLIMIT_NOFILE
4046 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
4048 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
4050 rlp.rlim_cur = rlp.rlim_max = 0;
4053 /* I originally chose 1000 as a nice big number that was unlikely to
4054 be exceeded. It turns out that some older OS have a fixed upper limit of
4057 if (rlp.rlim_cur < 1000)
4059 rlp.rlim_cur = rlp.rlim_max = 1000;
4060 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4062 rlp.rlim_cur = rlp.rlim_max = 256;
4063 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4064 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
4071 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
4073 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
4075 rlp.rlim_cur = rlp.rlim_max = 0;
4078 # ifdef RLIM_INFINITY
4079 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
4081 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
4083 if (rlp.rlim_cur < 1000)
4085 rlp.rlim_cur = rlp.rlim_max = 1000;
4087 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
4088 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
4094 /* Exim is normally entered as root (but some special configurations are
4095 possible that don't do this). However, it always spins off sub-processes that
4096 set their uid and gid as required for local delivery. We don't want to pass on
4097 any extra groups that root may belong to, so we want to get rid of them all at
4100 We need to obey setgroups() at this stage, before possibly giving up root
4101 privilege for a changed configuration file, but later on we might need to
4102 check on the additional groups for the admin user privilege - can't do that
4103 till after reading the config, which might specify the exim gid. Therefore,
4104 save the group list here first. */
4106 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
4107 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
4109 /* There is a fundamental difference in some BSD systems in the matter of
4110 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
4111 known not to be different. On the "different" systems there is a single group
4112 list, and the first entry in it is the current group. On all other versions of
4113 Unix there is a supplementary group list, which is in *addition* to the current
4114 group. Consequently, to get rid of all extraneous groups on a "standard" system
4115 you pass over 0 groups to setgroups(), while on a "different" system you pass
4116 over a single group - the current group, which is always the first group in the
4117 list. Calling setgroups() with zero groups on a "different" system results in
4118 an error return. The following code should cope with both types of system.
4120 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
4121 the "setgroups() with zero groups" - and changes the egid.
4122 Thanks to that we had to stash the original_egid above, for use below
4123 in the call to exim_setugid().
4125 However, if this process isn't running as root, setgroups() can't be used
4126 since you have to be root to run it, even if throwing away groups.
4127 Except, sigh, for Hurd - where you can.
4128 Not being root here happens only in some unusual configurations. */
4131 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
4132 && setgroups(0, NULL) != 0
4134 && setgroups(1, group_list) != 0)
4135 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
4137 /* If the configuration file name has been altered by an argument on the
4138 command line (either a new file name or a macro definition) and the caller is
4139 not root, or if this is a filter testing run, remove any setuid privilege the
4140 program has and run as the underlying user.
4142 The exim user is locked out of this, which severely restricts the use of -C
4145 Otherwise, set the real ids to the effective values (should be root unless run
4146 from inetd, which it can either be root or the exim uid, if one is configured).
4148 There is a private mechanism for bypassing some of this, in order to make it
4149 possible to test lots of configurations automatically, without having either to
4150 recompile each time, or to patch in an actual configuration file name and other
4151 values (such as the path name). If running in the test harness, pretend that
4152 configuration file changes and macro definitions haven't happened. */
4155 (!f.trusted_config || /* Config changed, or */
4156 !macros_trusted(opt_D_used)) && /* impermissible macros and */
4157 real_uid != root_uid && /* Not root, and */
4158 !f.running_in_test_harness /* Not fudged */
4160 expansion_test /* expansion testing */
4162 filter_test != FTEST_NONE) /* Filter testing */
4164 setgroups(group_count, group_list);
4165 exim_setugid(real_uid, real_gid, FALSE,
4166 US"-C, -D, -be or -bf forces real uid");
4167 removed_privilege = TRUE;
4169 /* In the normal case when Exim is called like this, stderr is available
4170 and should be used for any logging information because attempts to write
4171 to the log will usually fail. To arrange this, we unset really_exim. However,
4172 if no stderr is available there is no point - we might as well have a go
4173 at the log (if it fails, syslog will be written).
4175 Note that if the invoker is Exim, the logs remain available. Messing with
4176 this causes unlogged successful deliveries. */
4178 if (log_stderr && real_uid != exim_uid)
4179 f.really_exim = FALSE;
4182 /* Privilege is to be retained for the moment. It may be dropped later,
4183 depending on the job that this Exim process has been asked to do. For now, set
4184 the real uid to the effective so that subsequent re-execs of Exim are done by a
4188 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4190 /* If testing a filter, open the file(s) now, before wasting time doing other
4191 setups and reading the message. */
4193 if (filter_test & FTEST_SYSTEM)
4194 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4195 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4198 if (filter_test & FTEST_USER)
4199 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4200 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4203 /* Initialise lookup_list
4204 If debugging, already called above via version reporting.
4205 In either case, we initialise the list of available lookups while running
4206 as root. All dynamically modules are loaded from a directory which is
4207 hard-coded into the binary and is code which, if not a module, would be
4208 part of Exim already. Ability to modify the content of the directory
4209 is equivalent to the ability to modify a setuid binary!
4211 This needs to happen before we read the main configuration. */
4213 init_misc_mod_list();
4215 /*XXX this excrescence could move to the testsuite standard config setup file */
4217 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4220 /* Read the main runtime configuration data; this gives up if there
4221 is a failure. It leaves the configuration file open so that the subsequent
4222 configuration data for delivery can be read if needed.
4224 NOTE: immediately after opening the configuration file we change the working
4225 directory to "/"! Later we change to $spool_directory. We do it there, because
4226 during readconf_main() some expansion takes place already. */
4228 /* Store the initial cwd before we change directories. Can be NULL if the
4229 dir has already been unlinked. */
4230 initial_cwd = os_getcwd(NULL, 0);
4231 if (!initial_cwd && errno)
4232 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4234 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4235 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4238 -be[m] expansion test -
4239 -b[fF] filter test new
4241 -bmalware malware_test_file new
4243 -brw rewrite test new
4245 -bv[s] address verify -
4247 -bP <option> (except -bP config, which sets list_config)
4249 If any of these options is set, we suppress warnings about configuration
4250 issues (currently about tls_advertise_hosts and keep_environment not being
4254 int old_pool = store_pool;
4255 #ifdef MEASURE_TIMING
4257 (void)gettimeofday(&t0, NULL);
4260 store_pool = POOL_CONFIG;
4261 readconf_main(checking || list_options);
4262 store_pool = old_pool;
4264 #ifdef MEASURE_TIMING
4265 report_time_since(&t0, US"readconf_main (delta)");
4269 /* Now in directory "/" */
4271 if (cleanup_environment() == FALSE)
4272 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4275 /* If an action on specific messages is requested, or if a daemon or queue
4276 runner is being started, we need to know if Exim was called by an admin user.
4277 This is the case if the real user is root or exim, or if the real group is
4278 exim, or if one of the supplementary groups is exim or a group listed in
4279 admin_groups. We don't fail all message actions immediately if not admin_user,
4280 since some actions can be performed by non-admin users. Instead, set admin_user
4281 for later interrogation. */
4283 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4284 f.admin_user = TRUE;
4286 for (int i = 0; i < group_count && !f.admin_user; i++)
4287 if (group_list[i] == exim_gid)
4288 f.admin_user = TRUE;
4289 else if (admin_groups)
4290 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4291 if (admin_groups[j] == group_list[i])
4292 f.admin_user = TRUE;
4294 /* Another group of privileged users are the trusted users. These are root,
4295 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4296 are permitted to specify sender_addresses with -f on the command line, and
4297 other message parameters as well. */
4299 if (real_uid == root_uid || real_uid == exim_uid)
4300 f.trusted_caller = TRUE;
4304 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4305 if (trusted_users[i] == real_uid)
4306 f.trusted_caller = TRUE;
4309 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4310 if (trusted_groups[i] == real_gid)
4311 f.trusted_caller = TRUE;
4312 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4313 if (trusted_groups[i] == group_list[j])
4314 f.trusted_caller = TRUE;
4317 /* At this point, we know if the user is privileged and some command-line
4318 options become possibly impermissible, depending upon the configuration file. */
4320 if (checking && commandline_checks_require_admin && !f.admin_user)
4321 exim_fail("exim: those command-line flags are set to require admin\n");
4323 /* Handle the decoding of logging options. */
4325 decode_bits(log_selector, log_selector_size, log_notall,
4326 log_selector_string, log_options, log_options_count, US"log", 0);
4330 debug_printf("configuration file is %s\n", config_main_filename);
4331 debug_printf("log selectors =");
4332 for (int i = 0; i < log_selector_size; i++)
4333 debug_printf(" %08x", log_selector[i]);
4337 /* If domain literals are not allowed, check the sender address that was
4338 supplied with -f. Ditto for a stripped trailing dot. */
4342 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4343 exim_fail("exim: bad -f address \"%s\": domain literals not "
4344 "allowed\n", sender_address);
4345 if (f_end_dot && !strip_trailing_dot)
4346 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4347 "(trailing dot not allowed)\n", sender_address);
4350 /* See if an admin user overrode our logging. */
4352 if (cmdline_syslog_name)
4355 syslog_processname = cmdline_syslog_name;
4356 log_file_path = string_copy(CUS"syslog");
4359 /* not a panic, non-privileged users should not be able to spam paniclog */
4361 "exim: you lack sufficient privilege to specify syslog process name\n");
4363 /* Paranoia check of maximum lengths of certain strings. There is a check
4364 on the length of the log file path in log.c, which will come into effect
4365 if there are any calls to write the log earlier than this. However, if we
4366 get this far but the string is very long, it is better to stop now than to
4367 carry on and (e.g.) receive a message and then have to collapse. The call to
4368 log_write() from here will cause the ultimate panic collapse if the complete
4369 file name exceeds the buffer length. */
4371 if (Ustrlen(log_file_path) > 200)
4372 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4373 "log_file_path is longer than 200 chars: aborting");
4375 if (Ustrlen(pid_file_path) > 200)
4376 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4377 "pid_file_path is longer than 200 chars: aborting");
4379 if (Ustrlen(spool_directory) > 200)
4380 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4381 "spool_directory is longer than 200 chars: aborting");
4383 /* Length check on the process name given to syslog for its TAG field,
4384 which is only permitted to be 32 characters or less. See RFC 3164. */
4386 if (Ustrlen(syslog_processname) > 32)
4387 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4388 "syslog_processname is longer than 32 chars: aborting");
4393 log_write(0, LOG_MAIN, "%s", log_oneline);
4394 return EXIT_SUCCESS;
4397 return EXIT_FAILURE;
4399 /* In some operating systems, the environment variable TMPDIR controls where
4400 temporary files are created; Exim doesn't use these (apart from when delivering
4401 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4402 If TMPDIR is found in the environment, reset it to the value defined in the
4403 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4404 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4405 EXIM_TMPDIR by the build scripts.
4409 if (environ) for (uschar ** p = USS environ; *p; p++)
4410 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4412 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4413 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4415 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4419 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4420 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4421 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4422 called by a user who has set the TZ variable. This then affects the timestamps
4423 in log files and in Received: headers, and any created Date: header lines. The
4424 required timezone is settable in the configuration file, so nothing can be done
4425 about this earlier - but hopefully nothing will normally be logged earlier than
4426 this. We have to make a new environment if TZ is wrong, but don't bother if
4427 timestamps_utc is set, because then all times are in UTC anyway. */
4429 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4430 f.timestamps_utc = TRUE;
4433 uschar *envtz = US getenv("TZ");
4435 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4436 : timezone_string != NULL
4439 uschar **p = USS environ;
4443 if (environ) while (*p++) count++;
4444 if (!envtz) count++;
4445 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4446 if (environ) for (p = USS environ; *p; p++)
4447 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4448 if (timezone_string)
4450 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4451 sprintf(CS *newp++, "TZ=%s", timezone_string);
4456 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4457 tod_stamp(tod_log));
4461 /* Handle the case when we have removed the setuid privilege because of -C or
4462 -D. This means that the caller of Exim was not root.
4464 There is a problem if we were running as the Exim user. The sysadmin may
4465 expect this case to retain privilege because "the binary was called by the
4466 Exim user", but it hasn't, because either the -D option set macros, or the
4467 -C option set a non-trusted configuration file. There are two possibilities:
4469 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4470 to do message deliveries. Thus, the fact that it is running as a
4471 non-privileged user is plausible, and might be wanted in some special
4472 configurations. However, really_exim will have been set false when
4473 privilege was dropped, to stop Exim trying to write to its normal log
4474 files. Therefore, re-enable normal log processing, assuming the sysadmin
4475 has set up the log directory correctly.
4477 (2) If deliver_drop_privilege is not set, the configuration won't work as
4478 apparently intended, and so we log a panic message. In order to retain
4479 root for -C or -D, the caller must either be root or be invoking a
4480 trusted configuration file (when deliver_drop_privilege is false). */
4482 if ( removed_privilege
4483 && (!f.trusted_config || opt_D_used)
4484 && real_uid == exim_uid)
4485 if (deliver_drop_privilege)
4486 f.really_exim = TRUE; /* let logging work normally */
4488 log_write(0, LOG_MAIN|LOG_PANIC,
4489 "exim user lost privilege for using %s option",
4490 f.trusted_config? "-D" : "-C");
4492 /* Start up Perl interpreter if Perl support is configured and there is a
4493 perl_startup option, and the configuration or the command line specifies
4494 initializing starting. Note that the global variables are actually called
4495 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4498 if (perl_start_option != 0)
4499 opt_perl_at_start = (perl_start_option > 0);
4500 if (opt_perl_at_start && opt_perl_startup != NULL)
4503 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4504 if ((errstr = init_perl(opt_perl_startup)))
4505 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4506 opt_perl_started = TRUE;
4508 #endif /* EXIM_PERL */
4510 /* Log the arguments of the call if the configuration file said so. This is
4511 a debugging feature for finding out what arguments certain MUAs actually use.
4512 Don't attempt it if logging is disabled, or if listing variables or if
4513 verifying/testing addresses or expansions. */
4515 if ( (debug_selector & D_any || LOGGING(arguments))
4516 && f.really_exim && !list_options && !checking)
4518 uschar *p = big_buffer;
4519 Ustrcpy(p, US"cwd= (failed)");
4526 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4527 p += Ustrlen(CCS p);
4530 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4532 for (int i = 0; i < argc; i++)
4534 int len = Ustrlen(argv[i]);
4535 const uschar *printing;
4537 if (p + len + 8 >= big_buffer + big_buffer_size)
4539 Ustrcpy(p, US" ...");
4540 log_write(0, LOG_MAIN, "%s", big_buffer);
4541 Ustrcpy(big_buffer, US"...");
4544 printing = string_printing(argv[i]);
4545 if (!*printing) quote = US"\"";
4548 const uschar *pp = printing;
4550 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4552 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4553 (p - big_buffer) - 4), printing, quote);
4556 if (LOGGING(arguments))
4557 log_write(0, LOG_MAIN, "%s", big_buffer);
4559 debug_printf("%s\n", big_buffer);
4562 /* Set the working directory to be the top-level spool directory. We don't rely
4563 on this in the code, which always uses fully qualified names, but it's useful
4564 for core dumps etc. Don't complain if it fails - the spool directory might not
4565 be generally accessible and calls with the -C option (and others) have lost
4566 privilege by now. Before the chdir, we try to ensure that the directory exists.
4569 if (Uchdir(spool_directory) != 0)
4571 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4572 (void) Uchdir(spool_directory);
4575 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4576 alias file. Exim doesn't have such a concept, but this call is screwed into
4577 Sun's YP makefiles. Handle this by calling a configured script, as the real
4578 user who called Exim. The -oA option can be used to pass an argument to the
4583 (void) fclose(config_file);
4584 if (bi_command && *bi_command)
4587 const uschar * argv[3];
4588 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4589 if (alias_arg) argv[i++] = alias_arg;
4592 setgroups(group_count, group_list);
4593 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4595 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4596 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4598 execv(CS argv[0], (char *const *)argv);
4599 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4603 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4608 /* We moved the admin/trusted check to be immediately after reading the
4609 configuration file. We leave these prints here to ensure that syslog setup,
4610 logfile setup, and so on has already happened. */
4612 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4613 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4615 /* Only an admin user may start the daemon or force a queue run in the default
4616 configuration, but the queue run restriction can be relaxed. Only an admin
4617 user may request that a message be returned to its sender forthwith. Only an
4618 admin user may specify a debug level greater than D_v (because it might show
4619 passwords, etc. in lookup queries). Only an admin user may request a queue
4620 count. Only an admin user can use the test interface to scan for email
4621 (because Exim will be in the spool dir and able to look at mails). */
4625 BOOL debugset = (debug_selector & ~D_v) != 0;
4626 if ( deliver_give_up || f.daemon_listen || malware_test_file
4627 || count_queue && queue_list_requires_admin
4628 || list_queue && queue_list_requires_admin
4629 || qrunners && prod_requires_admin
4630 || queue_name_dest && prod_requires_admin
4631 || debugset && !f.running_in_test_harness
4633 exim_fail("exim:%s permission denied; not admin\n",
4634 debugset ? " debugging" : "");
4637 /* If the real user is not root or the exim uid, the argument for passing
4638 in an open TCP/IP connection for another message is not permitted, nor is
4639 running with the -N option for any delivery action, unless this call to exim is
4640 one that supplied an input message, or we are using a patched exim for
4641 regression testing. */
4643 if ( real_uid != root_uid && real_uid != exim_uid
4644 && ( continue_hostname
4646 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4648 && !f.running_in_test_harness
4650 exim_fail("exim: Permission denied; not exim user or root\n");
4652 /* If the caller is not trusted, certain arguments are ignored when running for
4653 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4654 Note that authority for performing certain actions on messages is tested in the
4655 queue_action() function. */
4657 if (!f.trusted_caller && !checking)
4659 sender_host_name = sender_host_address = interface_address =
4660 sender_ident = received_protocol = NULL;
4661 sender_host_port = interface_port = 0;
4662 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4665 /* If a sender host address is set, extract the optional port number off the
4666 end of it and check its syntax. Do the same thing for the interface address.
4667 Exim exits if the syntax is bad. */
4671 if (sender_host_address)
4672 sender_host_port = check_port(sender_host_address);
4673 if (interface_address)
4674 interface_port = check_port(interface_address);
4677 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4680 if (f.trusted_caller)
4682 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4683 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4686 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4689 /* If an SMTP message is being received check to see if the standard input is a
4690 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4691 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4696 union sockaddr_46 inetd_sock;
4697 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4698 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4700 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4701 if (family == AF_INET || family == AF_INET6)
4703 union sockaddr_46 interface_sock;
4704 size = sizeof(interface_sock);
4706 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4707 interface_address = host_ntoa(-1, &interface_sock, NULL,
4710 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4712 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4715 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4716 NULL, &sender_host_port);
4717 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4718 "inetd is not supported when mua_wrapper is set");
4722 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4727 /* If the load average is going to be needed while receiving a message, get it
4728 now for those OS that require the first call to os_getloadavg() to be done as
4729 root. There will be further calls later for each message received. */
4731 #ifdef LOAD_AVG_NEEDS_ROOT
4732 if ( receiving_message
4733 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4734 load_average = OS_GETLOADAVG();
4737 /* The queue_only configuration option can be overridden by -odx on the command
4738 line, except that if queue_only_override is false, queue_only cannot be unset
4739 from the command line. */
4741 if (queue_only_set && (queue_only_override || arg_queue_only))
4742 queue_only = arg_queue_only;
4744 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4747 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4748 if (arg_smtp_receive_timeout >= 0)
4749 smtp_receive_timeout = arg_smtp_receive_timeout;
4751 /* If Exim was started with root privilege, unless we have already removed the
4752 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4753 except when starting the daemon or doing some kind of delivery or address
4754 testing (-bt). These are the only cases when root need to be retained. We run
4755 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4756 retained only for starting the daemon. We always do the initgroups() in this
4757 situation (controlled by the TRUE below), in order to be as close as possible
4758 to the state Exim usually runs in. */
4760 if ( !unprivileged /* originally had root AND */
4761 && !removed_privilege /* still got root AND */
4762 && !f.daemon_listen /* not starting the daemon */
4763 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4764 && ( /* AND EITHER */
4765 deliver_drop_privilege /* requested unprivileged */
4767 !qrunners /* not running the queue */
4768 && ( msg_action_arg < 0 /* and */
4769 || msg_action != MSG_DELIVER /* not delivering */
4771 && (!checking || !f.address_test_mode) /* not address checking */
4772 && !rcpt_verify_quota /* and not quota checking */
4774 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4776 /* When we are retaining a privileged uid, we still change to the exim gid. */
4781 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4782 rv = setgid(exim_gid);
4783 /* Impact of failure is that some stuff might end up with an incorrect group.
4784 We track this for failures from root, since any attempt to change privilege
4785 by root should succeed and failures should be examined. For non-root,
4786 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4787 no need to complain then. */
4789 if (!(unprivileged || removed_privilege))
4790 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4793 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4794 (long int)exim_gid, strerror(errno));
4798 /* Handle a request to scan a file for malware */
4799 if (malware_test_file)
4801 #ifdef WITH_CONTENT_SCAN
4803 set_process_info("scanning file for malware");
4804 if ((result = malware_in_file(malware_test_file)) == FAIL)
4806 printf("No malware found.\n");
4807 exim_exit(EXIT_SUCCESS);
4811 printf("Malware lookup returned non-okay/fail: %d\n", result);
4812 exim_exit(EXIT_FAILURE);
4815 printf("Malware found: %s\n", malware_name);
4817 printf("Malware scan detected malware of unknown name.\n");
4819 printf("Malware scanning not enabled at compile time.\n");
4821 exim_exit(EXIT_FAILURE);
4824 /* Handle a request to list the delivery queue */
4828 set_process_info("listing the queue");
4829 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4830 exim_exit(EXIT_SUCCESS);
4833 /* Handle a request to count the delivery queue */
4837 set_process_info("counting the queue");
4838 fprintf(stdout, "%u\n", queue_count());
4839 exim_exit(EXIT_SUCCESS);
4842 /* Handle actions on specific messages, except for the force delivery and
4843 message load actions, which are done below. Some actions take a whole list of
4844 message ids, which are known to continue up to the end of the arguments. Others
4845 take a single message id and then operate on the recipients list. */
4847 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4849 int yield = EXIT_SUCCESS;
4850 set_process_info("acting on specified messages");
4852 /* ACL definitions may be needed when removing a message (-Mrm) because
4853 event_action gets expanded */
4855 if (msg_action == MSG_REMOVE)
4857 int old_pool = store_pool;
4858 store_pool = POOL_CONFIG;
4860 store_pool = old_pool;
4861 store_writeprotect(POOL_CONFIG);
4864 if (!one_msg_action)
4866 for (i = msg_action_arg; i < argc; i++)
4867 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4868 yield = EXIT_FAILURE;
4871 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4872 default: printf("\n"); break;
4876 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4877 recipients_arg)) yield = EXIT_FAILURE;
4881 /* We used to set up here to skip reading the ACL section, on
4882 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4883 Now, since the intro of the ${acl } expansion, ACL definitions may be
4884 needed in transports so we lost the optimisation. */
4887 int old_pool = store_pool;
4888 #ifdef MEASURE_TIMING
4890 (void)gettimeofday(&t0, NULL);
4893 store_pool = POOL_CONFIG;
4895 store_pool = old_pool;
4897 /* -be can add macro definitions, needing to link to the macro structure
4898 chain. Otherwise, make the memory used for config data readonly. */
4900 if (!expansion_test)
4901 store_writeprotect(POOL_CONFIG);
4903 #ifdef MEASURE_TIMING
4904 report_time_since(&t0, US"readconf_rest (delta)");
4908 /* Handle a request to check quota */
4909 if (rcpt_verify_quota)
4910 if (real_uid != root_uid && real_uid != exim_uid)
4911 exim_fail("exim: Permission denied\n");
4912 else if (recipients_arg >= argc)
4913 exim_fail("exim: missing recipient for quota check\n");
4916 verify_quota(US argv[recipients_arg]); /*XXX we lose track of const here */
4917 exim_exit(EXIT_SUCCESS);
4920 /* Handle the -brt option. This is for checking out retry configurations.
4921 The next three arguments are a domain name or a complete address, and
4922 optionally two error numbers. All it does is to call the function that
4923 scans the retry configuration data. */
4925 if (test_retry_arg >= 0)
4927 retry_config *yield;
4928 int basic_errno = 0;
4930 const uschar *s1, *s2;
4932 if (test_retry_arg >= argc)
4934 printf("-brt needs a domain or address argument\n");
4935 exim_exit(EXIT_FAILURE);
4937 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4940 /* If the first argument contains no @ and no . it might be a local user
4941 or it might be a single-component name. Treat as a domain. */
4943 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4945 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4946 "being \ntreated as a one-component domain, not as a local part.\n\n",
4950 /* There may be an optional second domain arg. */
4952 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4953 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4955 /* The final arg is an error name */
4957 if (test_retry_arg < argc)
4959 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4961 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4964 printf("%s\n", CS error);
4965 return EXIT_FAILURE;
4968 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4969 code > 100 as an error is for matching codes to the decade. Turn them into
4970 a real error code, off the decade. */
4972 if (basic_errno == ERRNO_MAIL4XX ||
4973 basic_errno == ERRNO_RCPT4XX ||
4974 basic_errno == ERRNO_DATA4XX)
4976 int code = (more_errno >> 8) & 255;
4978 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4979 else if (code > 100)
4980 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4984 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4985 printf("No retry information found\n");
4988 more_errno = yield->more_errno;
4989 printf("Retry rule: %s ", yield->pattern);
4991 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4993 printf("quota%s%s ",
4994 (more_errno > 0)? "_" : "",
4995 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4997 else if (yield->basic_errno == ECONNREFUSED)
4999 printf("refused%s%s ",
5000 (more_errno > 0)? "_" : "",
5001 (more_errno == 'M')? "MX" :
5002 (more_errno == 'A')? "A" : "");
5004 else if (yield->basic_errno == ETIMEDOUT)
5007 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
5009 if (more_errno != 0) printf("_%s",
5010 (more_errno == 'M')? "MX" : "A");
5013 else if (yield->basic_errno == ERRNO_AUTHFAIL)
5014 printf("auth_failed ");
5017 for (retry_rule * r = yield->rules; r; r = r->next)
5019 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
5020 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
5026 printf(",%d.", x/1000);
5040 exim_exit(EXIT_SUCCESS);
5043 /* Handle a request to list one or more configuration options */
5044 /* If -n was set, we suppress some information */
5049 set_process_info("listing variables");
5050 if (recipients_arg >= argc)
5051 fail = !readconf_print(US"all", NULL, flag_n);
5052 else for (i = recipients_arg; i < argc; i++)
5055 (Ustrcmp(argv[i], "router") == 0 ||
5056 Ustrcmp(argv[i], "transport") == 0 ||
5057 Ustrcmp(argv[i], "authenticator") == 0 ||
5058 Ustrcmp(argv[i], "macro") == 0 ||
5059 Ustrcmp(argv[i], "environment") == 0))
5061 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
5065 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
5067 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
5072 set_process_info("listing config");
5073 exim_exit(readconf_print(US"config", NULL, flag_n)
5074 ? EXIT_SUCCESS : EXIT_FAILURE);
5078 /* Initialise subsystems as required. */
5082 /* Handle a request to deliver one or more messages that are already on the
5083 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
5084 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
5086 Delivery of specific messages is typically used for a small number when
5087 prodding by hand (when the option forced_delivery will be set) or when
5088 re-execing to regain root privilege. Each message delivery must happen in a
5089 separate process, so we fork a process for each one, and run them sequentially
5090 so that debugging output doesn't get intertwined, and to avoid spawning too
5091 many processes if a long list is given. However, don't fork for the last one;
5092 this saves a process in the common case when Exim is called to deliver just one
5095 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
5097 if (prod_requires_admin && !f.admin_user)
5099 fprintf(stderr, "exim: Permission denied\n");
5100 exim_exit(EXIT_FAILURE);
5102 set_process_info("delivering specified messages");
5103 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
5104 for (i = msg_action_arg; i < argc; i++)
5108 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
5109 that runs into a later copy into the untainted global message_id[] */
5110 /*XXX Do we need a length limit check here? */
5112 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5113 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
5115 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5116 exim_underbar_exit(EXIT_SUCCESS);
5120 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
5122 exim_exit(EXIT_FAILURE);
5126 exim_exit(EXIT_SUCCESS);
5130 /* If only a single queue run is requested, without SMTP listening, we can just
5131 turn into a queue runner, with an optional starting message id. */
5133 if (is_onetime_qrun() && !f.daemon_listen)
5135 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
5136 exim_exit(EXIT_SUCCESS);
5140 /* Find the login name of the real user running this process. This is always
5141 needed when receiving a message, because it is written into the spool file. It
5142 may also be used to construct a from: or a sender: header, and in this case we
5143 need the user's full name as well, so save a copy of it, checked for RFC822
5144 syntax and munged if necessary, if it hasn't previously been set by the -F
5145 argument. We may try to get the passwd entry more than once, in case NIS or
5146 other delays are in evidence. Save the home directory for use in filter testing
5151 if ((pw = getpwuid(real_uid)) != NULL)
5153 originator_login = string_copy(US pw->pw_name);
5154 originator_home = string_copy(US pw->pw_dir);
5156 /* If user name has not been set by -F, set it from the passwd entry
5157 unless -f has been used to set the sender address by a trusted user. */
5159 if (!originator_name)
5161 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5163 uschar *name = US pw->pw_gecos;
5164 uschar *amp = Ustrchr(name, '&');
5167 /* Most Unix specify that a '&' character in the gecos field is
5168 replaced by a copy of the login name, and some even specify that
5169 the first character should be upper cased, so that's what we do. */
5174 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5175 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5176 buffer[loffset] = toupper(buffer[loffset]);
5180 /* If a pattern for matching the gecos field was supplied, apply
5181 it and then expand the name string. */
5183 GET_OPTION("gecos_pattern");
5184 GET_OPTION("gecos_name");
5185 if (gecos_pattern && gecos_name)
5187 const pcre2_code *re;
5188 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5190 if (regex_match_and_setup(re, name, 0, -1))
5192 uschar *new_name = expand_string(gecos_name);
5196 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5197 "gecos field \"%s\"\n", new_name, name);
5200 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5201 "\"%s\": %s\n", gecos_name, expand_string_message);
5203 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5204 "gecos field \"%s\"\n", gecos_pattern, name);
5205 store_free((void *)re);
5207 originator_name = string_copy(name);
5210 /* A trusted caller has used -f but not -F */
5212 else originator_name = US"";
5215 /* Break the retry loop */
5220 if (++i > finduser_retries) break;
5224 /* If we cannot get a user login, log the incident and give up, unless the
5225 configuration specifies something to use. When running in the test harness,
5226 any setting of unknown_login overrides the actual name. */
5228 if (!originator_login || f.running_in_test_harness)
5230 GET_OPTION("unknown_login");
5233 originator_login = expand_string(unknown_login);
5234 if (!originator_name && unknown_username)
5235 originator_name = expand_string(unknown_username);
5236 if (!originator_name) originator_name = US"";
5238 if (!originator_login)
5239 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5243 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5246 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5248 /* If a message is created by this call of Exim, the uid/gid of its originator
5249 are those of the caller. These values are overridden if an existing message is
5250 read in from the spool. */
5252 originator_uid = real_uid;
5253 originator_gid = real_gid;
5255 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5256 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5258 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5259 returns. We leave this till here so that the originator_ fields are available
5260 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5263 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5267 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5268 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5269 "mua_wrapper is set");
5272 # ifndef DISABLE_TLS
5273 /* This also checks that the library linkage is working and we can call
5274 routines in it, so call even if tls_require_ciphers is unset */
5276 # ifdef MEASURE_TIMING
5278 (void)gettimeofday(&t0, NULL);
5280 if (!tls_dropprivs_validate_require_cipher(FALSE))
5281 exim_exit(EXIT_FAILURE);
5282 # ifdef MEASURE_TIMING
5283 report_time_since(&t0, US"validate_ciphers (delta)");
5291 /* If the sender ident has not been set (by a trusted caller) set it to
5292 the caller. This will get overwritten below for an inetd call. If a trusted
5293 caller has set it empty, unset it. */
5295 if (!sender_ident) sender_ident = originator_login;
5296 else if (!*sender_ident) sender_ident = NULL;
5298 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5299 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5300 originator_* variables set. */
5302 if (test_rewrite_arg >= 0)
5304 f.really_exim = FALSE;
5305 if (test_rewrite_arg >= argc)
5307 printf("-brw needs an address argument\n");
5308 exim_exit(EXIT_FAILURE);
5310 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5311 exim_exit(EXIT_SUCCESS);
5314 /* A locally-supplied message is considered to be coming from a local user
5315 unless a trusted caller supplies a sender address with -f, or is passing in the
5316 message via SMTP (inetd invocation or otherwise). */
5318 if ( !sender_address && !smtp_input
5319 || !f.trusted_caller && filter_test == FTEST_NONE)
5321 f.sender_local = TRUE;
5323 /* A trusted caller can supply authenticated_sender and authenticated_id
5324 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5325 defaults except when host checking. */
5327 if (!authenticated_sender && !host_checking)
5328 authenticated_sender = string_sprintf("%s@%s", originator_login,
5329 qualify_domain_sender);
5330 if (!authenticated_id && !host_checking)
5331 authenticated_id = originator_login;
5334 /* Trusted callers are always permitted to specify the sender address.
5335 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5336 is specified is the empty address. However, if a trusted caller does not
5337 specify a sender address for SMTP input, we leave sender_address unset. This
5338 causes the MAIL commands to be honoured. */
5340 if ( !smtp_input && !sender_address
5341 || !receive_check_set_sender(sender_address))
5343 /* Either the caller is not permitted to set a general sender, or this is
5344 non-SMTP input and the trusted caller has not set a sender. If there is no
5345 sender, or if a sender other than <> is set, override with the originator's
5346 login (which will get qualified below), except when checking things. */
5348 if ( !sender_address /* No sender_address set */
5350 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5351 !checking)) /* Not running tests, including filter tests */
5353 sender_address = originator_login;
5354 f.sender_address_forced = FALSE;
5355 sender_address_domain = 0;
5359 /* Remember whether an untrusted caller set the sender address */
5361 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5363 /* Ensure that the sender address is fully qualified unless it is the empty
5364 address, which indicates an error message, or doesn't exist (root caller, smtp
5365 interface, no -f argument). */
5367 if (sender_address && *sender_address && sender_address_domain == 0)
5368 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5369 qualify_domain_sender);
5371 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5373 /* Handle a request to verify a list of addresses, or test them for delivery.
5374 This must follow the setting of the sender address, since routers can be
5375 predicated upon the sender. If no arguments are given, read addresses from
5376 stdin. Set debug_level to at least D_v to get full output for address testing.
5379 if (verify_address_mode || f.address_test_mode)
5382 int flags = vopt_qualify;
5384 if (verify_address_mode)
5386 if (!verify_as_sender) flags |= vopt_is_recipient;
5387 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5392 flags |= vopt_is_recipient;
5393 debug_selector |= D_v;
5394 debug_file = stderr;
5395 debug_fd = fileno(debug_file);
5396 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5399 if (recipients_arg < argc)
5400 while (recipients_arg < argc)
5402 /* Supplied addresses are tainted since they come from a user */
5403 uschar * s = string_copy_taint(
5404 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5408 BOOL finished = FALSE;
5409 uschar *ss = parse_find_address_end(s, FALSE);
5410 if (*ss == ',') *ss = 0; else finished = TRUE;
5411 test_address(s, flags, &exit_value);
5414 while (*++s == ',' || isspace(*s)) ;
5420 uschar * s = get_stdinput(NULL, NULL);
5422 test_address(string_copy_taint(
5423 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5425 flags, &exit_value);
5429 exim_exit(exit_value);
5432 /* Handle expansion checking. Either expand items on the command line, or read
5433 from stdin if there aren't any. If -Mset was specified, load the message so
5434 that its variables can be used, but restrict this facility to admin users.
5435 Otherwise, if -bem was used, read a message from stdin. */
5439 dns_init(FALSE, FALSE, FALSE);
5440 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5444 exim_fail("exim: permission denied\n");
5445 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5446 /* Checking the length of the ID is sufficient to validate it.
5447 Get an untainted version so file opens can be done. */
5448 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5450 spoolname = string_sprintf("%s-H", message_id);
5451 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5452 printf ("Failed to load message datafile %s\n", message_id);
5453 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5454 printf ("Failed to load message %s\n", message_id);
5457 /* Read a test message from a file. We fudge it up to be on stdin, saving
5458 stdin itself for later reading of expansion strings. */
5460 else if (expansion_test_message)
5462 uschar * rme = expand_string(recipients_max);
5463 int save_stdin = dup(0);
5464 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5466 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5469 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5470 message_ended = END_NOTENDED;
5471 recipients_max_expanded = atoi(CCS rme);
5472 read_message_body(receive_msg(extract_recipients));
5473 message_linecount += body_linecount;
5474 (void)dup2(save_stdin, 0);
5475 (void)close(save_stdin);
5476 clearerr(stdin); /* Required by Darwin */
5479 /* Only admin users may see config-file macros this way */
5481 if (!f.admin_user) macros_user = macros = mlast = NULL;
5483 /* Allow $recipients for this testing */
5485 f.enable_dollar_recipients = TRUE;
5487 /* Expand command line items */
5489 if (recipients_arg < argc)
5490 while (recipients_arg < argc)
5491 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5497 char *(*fn_readline)(const char *) = NULL;
5498 void (*fn_addhist)(const char *) = NULL;
5502 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5505 while (s = get_stdinput(fn_readline, fn_addhist))
5506 expansion_test_line(s);
5509 if (dlhandle) dlclose(dlhandle);
5513 /* The data file will be open after -Mset */
5515 if (deliver_datafile >= 0)
5517 (void)close(deliver_datafile);
5518 deliver_datafile = -1;
5521 exim_exit(EXIT_SUCCESS);
5525 /* The active host name is normally the primary host name, but it can be varied
5526 for hosts that want to play several parts at once. We need to ensure that it is
5527 set for host checking, and for receiving messages. */
5529 smtp_active_hostname = primary_hostname;
5530 GET_OPTION("smtp_active_hostname");
5531 if (raw_active_hostname)
5533 uschar * nah = expand_string(raw_active_hostname);
5536 if (!f.expand_string_forcedfail)
5537 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5538 "(smtp_active_hostname): %s", raw_active_hostname,
5539 expand_string_message);
5541 else if (nah[0]) smtp_active_hostname = nah;
5544 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5545 given IP address so that the blocking and relay configuration can be tested.
5546 Unless a sender_ident was set by -oMt, we discard it (the default is the
5547 caller's login name). An RFC 1413 call is made only if we are running in the
5548 test harness and an incoming interface and both ports are specified, because
5549 there is no TCP/IP call to find the ident for. */
5556 if (!sender_ident_set)
5558 sender_ident = NULL;
5559 if (f.running_in_test_harness && sender_host_port
5560 && interface_address && interface_port)
5561 verify_get_ident(1223); /* note hardwired port number */
5564 /* In case the given address is a non-canonical IPv6 address, canonicalize
5565 it. Use the compressed form for IPv6. */
5567 size = host_aton(sender_host_address, x);
5568 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5570 (void) host_nmtoa(size, x, -1, sender_host_address, ':');
5572 (void) ipv6_nmtoa(x, sender_host_address);
5574 /* Now set up for testing */
5576 host_build_sender_fullhost();
5580 f.sender_local = FALSE;
5581 f.sender_host_notsocket = TRUE;
5582 debug_file = stderr;
5583 debug_fd = fileno(debug_file);
5584 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5585 "**** but without any ident (RFC 1413) callback.\n"
5586 "**** This is not for real!\n\n",
5587 sender_host_address);
5589 set_connection_id();
5590 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5591 if (verify_check_host(&hosts_connection_nolog) == OK)
5593 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5594 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5596 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5598 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5599 because a log line has already been written for all its failure exists
5600 (usually "connection refused: <reason>") and writing another one is
5601 unnecessary clutter. */
5603 if (smtp_start_session())
5606 for (; (reset_point = store_mark()); store_reset(reset_point))
5608 if (smtp_setup_msg() <= 0) break;
5609 if (!receive_msg(FALSE)) break;
5611 return_path = sender_address = NULL;
5612 dnslist_domain = dnslist_matched = NULL;
5614 deliver_localpart_orig = NULL;
5615 deliver_domain_orig = NULL;
5616 callout_address = sending_ip_address = NULL;
5617 deliver_localpart_data = deliver_domain_data =
5618 recipient_data = sender_data = NULL;
5619 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5623 exim_exit(EXIT_SUCCESS);
5627 /* Arrange for message reception if recipients or SMTP were specified;
5628 otherwise complain unless a version print (-bV) happened or this is a filter
5629 verification test or info dump.
5630 In the former case, show the configuration file name. */
5632 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5634 if (version_printed)
5636 if (Ustrchr(config_main_filelist, ':'))
5637 printf("Configuration file search path is %s\n", config_main_filelist);
5638 printf("Configuration file is %s\n", config_main_filename);
5639 return EXIT_SUCCESS;
5642 if (info_flag != CMDINFO_NONE)
5644 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5645 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5648 if (filter_test == FTEST_NONE)
5649 exim_usage(called_as);
5653 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5654 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5655 that we are not called from inetd, because that is rejected above. The
5656 following configuration settings are forced here:
5658 (1) Synchronous delivery (-odi)
5659 (2) Errors to stderr (-oep == -oeq)
5660 (3) No parallel remote delivery
5661 (4) Unprivileged delivery
5663 We don't force overall queueing options because there are several of them;
5664 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5665 to override any SMTP queueing. */
5669 f.synchronous_delivery = TRUE;
5670 arg_error_handling = ERRORS_STDERR;
5671 remote_max_parallel = 1;
5672 deliver_drop_privilege = TRUE;
5673 f.queue_smtp = FALSE;
5674 queue_smtp_domains = NULL;
5676 message_utf8_downconvert = -1; /* convert-if-needed */
5681 /* Prepare to accept one or more new messages on the standard input. When a
5682 message has been read, its id is returned in message_id[]. If doing immediate
5683 delivery, we fork a delivery process for each received message, except for the
5684 last one, where we can save a process switch.
5686 It is only in non-smtp mode that error_handling is allowed to be changed from
5687 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5688 sendmail error modes other than -oem ever actually used? Later: yes.) */
5690 if (!smtp_input) error_handling = arg_error_handling;
5692 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5693 logging being sent down the socket and make an identd call to get the
5696 else if (f.is_inetd)
5698 (void)fclose(stderr);
5699 exim_nullstd(); /* Re-open to /dev/null */
5700 verify_get_ident(IDENT_PORT);
5701 host_build_sender_fullhost();
5702 set_process_info("handling incoming connection from %s via inetd",
5706 /* If the sender host address has been set, build sender_fullhost if it hasn't
5707 already been done (which it will have been for inetd). This caters for the
5708 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5709 so that the test for IP options is skipped for -bs input. */
5711 if (sender_host_address && !sender_fullhost)
5713 host_build_sender_fullhost();
5714 set_process_info("handling incoming connection from %s via -oMa",
5716 f.sender_host_notsocket = TRUE;
5719 /* Otherwise, set the sender host as unknown except for inetd calls. This
5720 prevents host checking in the case of -bs not from inetd and also for -bS. */
5722 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5724 /* If stdout does not exist, then dup stdin to stdout. This can happen
5725 if exim is started from inetd. In this case fd 0 will be set to the socket,
5726 but fd 1 will not be set. This also happens for passed SMTP channels. */
5728 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5730 /* Set up the incoming protocol name and the state of the program. Root is
5731 allowed to force received protocol via the -oMr option above. If we have come
5732 via inetd, the process info has already been set up. We don't set
5733 received_protocol here for smtp input, as it varies according to
5734 batch/HELO/EHLO/AUTH/TLS. */
5738 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5739 smtp_batched_input? "batched " : "",
5740 sender_address ? sender_address : originator_login);
5744 int old_pool = store_pool;
5745 store_pool = POOL_PERM;
5746 if (!received_protocol)
5747 received_protocol = string_sprintf("local%s", called_as);
5748 store_pool = old_pool;
5749 set_process_info("accepting a local non-SMTP message from <%s>",
5753 /* Initialize the session_local_queue-only flag (this will be ignored if
5754 mua_wrapper is set) */
5757 session_local_queue_only = queue_only;
5759 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5760 the spool if so configured. On failure, we must not attempt to send an error
5761 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5762 error code is given.) */
5764 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5765 exim_fail("exim: insufficient disk space\n");
5767 /* If this is smtp input of any kind, real or batched, handle the start of the
5770 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5771 because a log line has already been written for all its failure exists
5772 (usually "connection refused: <reason>") and writing another one is
5773 unnecessary clutter. */
5775 set_connection_id();
5780 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5781 if (verify_check_host(&hosts_connection_nolog) == OK)
5783 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5784 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5786 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5787 if (!smtp_start_session())
5790 exim_exit(EXIT_SUCCESS);
5794 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5795 (we handle buferring so as to have visibility of fill level). */
5799 GET_OPTION("message_size_limit");
5800 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5801 if (expand_string_message)
5802 if (thismessage_size_limit == -1)
5803 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5804 "message_size_limit: %s", expand_string_message);
5806 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5807 "message_size_limit: %s", expand_string_message);
5809 setvbuf(stdin, NULL, _IONBF, 0);
5812 /* Loop for several messages when reading SMTP input. If we fork any child
5813 processes, we don't want to wait for them unless synchronous delivery is
5814 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5815 same as SIG_DFL, despite the fact that documentation often lists the default as
5816 "ignore". This is a confusing area. This is what I know:
5818 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5819 processes that complete simply to go away without ever becoming defunct. You
5820 can't then wait for them - but we don't want to wait for them in the
5821 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5822 happen for all OS (e.g. *BSD is different).
5824 But that's not the end of the story. Some (many? all?) systems have the
5825 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5826 has by default, so it seems that the difference is merely one of default
5827 (compare restarting vs non-restarting signals).
5829 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5830 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5831 of the loop below. Paranoia rules.
5833 February 2003: That's *still* not the end of the story. There are now versions
5834 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5835 process then calls waitpid(), a grumble is written to the system log, because
5836 this is logically inconsistent. In other words, it doesn't like the paranoia.
5837 As a consequence of this, the waitpid() below is now excluded if we are sure
5838 that SIG_IGN works. */
5840 if (!f.synchronous_delivery)
5843 struct sigaction act;
5844 act.sa_handler = SIG_IGN;
5845 sigemptyset(&(act.sa_mask));
5846 act.sa_flags = SA_NOCLDWAIT;
5847 sigaction(SIGCHLD, &act, NULL);
5849 signal(SIGCHLD, SIG_IGN);
5853 /* Save the current store pool point, for resetting at the start of
5854 each message, and save the real sender address, if any. */
5856 real_sender_address = sender_address;
5858 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5859 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5862 for (BOOL more = TRUE; more; )
5864 rmark reset_point = store_mark();
5867 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5868 input and build the recipients list, before calling receive_msg() to read the
5869 message proper. Whatever sender address is given in the SMTP transaction is
5870 often ignored for local senders - we use the actual sender, which is normally
5871 either the underlying user running this process or a -f argument provided by
5872 a trusted caller. It is saved in real_sender_address. The test for whether to
5873 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5878 if ((rc = smtp_setup_msg()) > 0)
5880 if ( real_sender_address
5881 && !receive_check_set_sender(sender_address))
5883 sender_address = raw_sender = real_sender_address;
5884 sender_address_unrewritten = NULL;
5887 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5888 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5889 the very end. The result of the ACL is ignored (as for other non-SMTP
5890 messages). It is run for its potential side effects. */
5892 if (smtp_batched_input)
5894 GET_OPTION("acl_not_smtp_start");
5895 if (acl_not_smtp_start)
5897 uschar * user_msg, * log_msg;
5898 f.enable_dollar_recipients = TRUE;
5899 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5900 &user_msg, &log_msg);
5901 f.enable_dollar_recipients = FALSE;
5905 /* Now get the data for the message */
5907 more = receive_msg(extract_recipients);
5910 cancel_cutthrough_connection(TRUE, US"receive dropped");
5911 if (more) goto MORELOOP;
5912 smtp_log_no_mail(); /* Log no mail if configured */
5913 exim_exit(EXIT_FAILURE);
5918 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5919 smtp_log_no_mail(); /* Log no mail if configured */
5920 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5924 /* In the non-SMTP case, we have all the information from the command
5925 line, but must process it in case it is in the more general RFC822
5926 format, and in any case, to detect syntax errors. Also, it appears that
5927 the use of comma-separated lists as single arguments is common, so we
5928 had better support them. */
5932 uschar * rme = expand_string(recipients_max);
5933 int rcount = 0, count = argc - recipients_arg;
5934 const uschar ** list = argv + recipients_arg;
5936 recipients_max_expanded = atoi(CCS rme);
5938 /* These options cannot be changed dynamically for non-SMTP messages */
5940 f.active_local_sender_retain = local_sender_retain;
5941 f.active_local_from_check = local_from_check;
5943 /* Save before any rewriting */
5945 raw_sender = string_copy(sender_address);
5947 /* Loop for each argument (supplied by user hence tainted) */
5949 for (int i = 0; i < count; i++)
5951 int start, end, domain;
5953 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5954 We'll still want to cap it to something, just in case. */
5955 uschar * s = string_copy_taint(
5956 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5959 /* Loop for each comma-separated address */
5963 BOOL finished = FALSE;
5965 uschar * ss = parse_find_address_end(s, FALSE);
5967 if (*ss == ',') *ss = 0; else finished = TRUE;
5969 /* Check max recipients - if -t was used, these aren't recipients */
5971 if ( recipients_max_expanded > 0 && ++rcount > recipients_max_expanded
5972 && !extract_recipients)
5974 DEBUG(D_all) debug_printf("excess reipients (max %d)\n",
5975 recipients_max_expanded);
5977 if (error_handling == ERRORS_STDERR)
5979 fprintf(stderr, "exim: too many recipients\n");
5980 exim_exit(EXIT_FAILURE);
5984 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5985 errors_sender_rc : EXIT_FAILURE;
5990 BOOL b = allow_utf8_domains;
5991 allow_utf8_domains = TRUE;
5994 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5998 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5999 else allow_utf8_domains = b;
6004 if (domain == 0 && !f.allow_unqualified_recipient)
6007 errmess = US"unqualified recipient address not allowed";
6012 DEBUG(D_all) debug_printf("bad recipient address \"%s\": %s\n",
6013 string_printing(list[i]), errmess);
6015 if (error_handling == ERRORS_STDERR)
6017 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
6018 string_printing(list[i]), errmess);
6019 exim_exit(EXIT_FAILURE);
6025 eblock.text1 = string_printing(list[i]);
6026 eblock.text2 = errmess;
6028 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
6029 errors_sender_rc : EXIT_FAILURE;
6033 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
6036 while (*++s && (*s == ',' || isspace(*s)));
6040 /* Show the recipients when debugging */
6044 if (sender_address) debug_printf("Sender: %s\n", sender_address);
6045 if (recipients_list)
6047 debug_printf("Recipients:\n");
6048 for (int i = 0; i < recipients_count; i++)
6049 debug_printf(" %s\n", recipients_list[i].address);
6053 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
6054 ignored; rejecting here would just add complication, and it can just as
6055 well be done later. Allow $recipients to be visible in the ACL. */
6057 GET_OPTION("acl_not_smtp_start");
6058 if (acl_not_smtp_start)
6060 uschar * user_msg, * log_msg;
6061 f.enable_dollar_recipients = TRUE;
6062 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
6063 &user_msg, &log_msg);
6064 f.enable_dollar_recipients = FALSE;
6067 /* Pause for a while waiting for input. If none received in that time,
6068 close the logfile, if we had one open; then if we wait for a long-running
6069 datasource (months, in one use-case) log rotation will not leave us holding
6072 if (!receive_timeout)
6073 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
6076 /* Read the data for the message. If filter_test is not FTEST_NONE, this
6077 will just read the headers for the message, and not write anything onto the
6080 message_ended = END_NOTENDED;
6081 more = receive_msg(extract_recipients);
6083 /* more is always FALSE here (not SMTP message) when reading a message
6084 for real; when reading the headers of a message for filter testing,
6085 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
6087 if (!message_id[0]) exim_exit(EXIT_FAILURE);
6088 } /* Non-SMTP message reception */
6090 /* If this is a filter testing run, there are headers in store, but
6091 no message on the spool. Run the filtering code in testing mode, setting
6092 the domain to the qualify domain and the local part to the current user,
6093 unless they have been set by options. The prefix and suffix are left unset
6094 unless specified. The the return path is set to to the sender unless it has
6095 already been set from a return-path header in the message. */
6097 if (filter_test != FTEST_NONE)
6099 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
6100 deliver_domain_orig = deliver_domain;
6101 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
6102 deliver_localpart_orig = deliver_localpart;
6103 deliver_localpart_prefix = US ftest_prefix;
6104 deliver_localpart_suffix = US ftest_suffix;
6105 deliver_home = originator_home;
6109 printf("Return-path copied from sender\n");
6110 return_path = string_copy(sender_address);
6113 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
6114 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
6116 receive_add_recipient(
6117 string_sprintf("%s%s%s@%s",
6118 ftest_prefix ? ftest_prefix : US"",
6120 ftest_suffix ? ftest_suffix : US"",
6121 deliver_domain), -1);
6123 printf("Recipient = %s\n", recipients_list[0].address);
6124 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
6125 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
6127 if (chdir("/")) /* Get away from wherever the user is running this from */
6129 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
6130 exim_exit(EXIT_FAILURE);
6133 /* Now we run either a system filter test, or a user filter test, or both.
6134 In the latter case, headers added by the system filter will persist and be
6135 available to the user filter. We need to copy the filter variables
6138 if (filter_test & FTEST_SYSTEM)
6139 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
6140 exim_exit(EXIT_FAILURE);
6142 memcpy(filter_sn, filter_n, sizeof(filter_sn));
6144 if (filter_test & FTEST_USER)
6145 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
6146 exim_exit(EXIT_FAILURE);
6148 exim_exit(EXIT_SUCCESS);
6151 /* Else act on the result of message reception. We should not get here unless
6152 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
6153 will be TRUE. If it is not, check on the number of messages received in this
6156 if ( !session_local_queue_only
6157 && smtp_accept_queue_per_connection > 0
6158 && receive_messagecount > smtp_accept_queue_per_connection)
6160 session_local_queue_only = TRUE;
6161 queue_only_reason = 2;
6164 /* Initialize local_queue_only from session_local_queue_only. If it is false,
6165 and queue_only_load is set, check that the load average is below it. If it is
6166 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
6167 default), we put the whole session into queue_only mode. It then remains this
6168 way for any subsequent messages on the same SMTP connection. This is a
6169 deliberate choice; even though the load average may fall, it doesn't seem
6170 right to deliver later messages on the same call when not delivering earlier
6171 ones. However, there are odd cases where this is not wanted, so this can be
6172 changed by setting queue_only_load_latch false. */
6174 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
6175 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
6177 queue_only_reason = 3;
6178 if (queue_only_load_latch) session_local_queue_only = TRUE;
6181 /* If running as an MUA wrapper, all queueing options and freezing options
6185 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6187 /* Log the queueing here, when it will get a message id attached, but
6188 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6191 if (local_queue_only)
6193 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6194 switch(queue_only_reason)
6197 log_write(L_delay_delivery,
6198 LOG_MAIN, "no immediate delivery: more than %d messages "
6199 "received in one connection", smtp_accept_queue_per_connection);
6203 log_write(L_delay_delivery,
6204 LOG_MAIN, "no immediate delivery: load average %.2f",
6205 (double)load_average/1000.0);
6210 else if (f.queue_only_policy || f.deliver_freeze)
6211 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6213 /* Else do the delivery unless the ACL or local_scan() called for queue only
6214 or froze the message. Always deliver in a separate process. A fork failure is
6215 not a disaster, as the delivery will eventually happen on a subsequent queue
6216 run. The search cache must be tidied before the fork, as the parent will
6217 do it before exiting. The child will trigger a lookup failure and
6218 thereby defer the delivery if it tries to use (for example) a cached ldap
6219 connection that the parent has called unbind on. */
6226 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6229 close_unwanted(); /* Close unwanted file descriptors and TLS */
6230 exim_nullstd(); /* Ensure std{in,out,err} exist */
6232 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6233 mode, deliver_drop_privilege is forced TRUE). */
6235 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6237 delivery_re_exec(CEE_EXEC_EXIT);
6238 /* Control does not return here. */
6241 /* No need to re-exec */
6243 rc = deliver_message(message_id, FALSE, FALSE);
6245 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6246 ? EXIT_SUCCESS : EXIT_FAILURE);
6251 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6252 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6253 "process: %s", strerror(errno));
6257 release_cutthrough_connection(US"msg passed for delivery");
6259 /* In the parent, wait if synchronous delivery is required. This will
6260 always be the case in MUA wrapper mode. */
6262 if (f.synchronous_delivery)
6265 while (wait(&status) != pid);
6266 if ((status & 0x00ff) != 0)
6267 log_write(0, LOG_MAIN|LOG_PANIC,
6268 "process %d crashed with signal %d while delivering %s",
6269 (int)pid, status & 0x00ff, message_id);
6270 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6275 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6276 automatically reaps children (see comments above the loop), clear away any
6277 finished subprocesses here, in case there are lots of messages coming in
6278 from the same source. */
6280 #ifndef SIG_IGN_WORKS
6281 while (waitpid(-1, NULL, WNOHANG) > 0);
6285 return_path = sender_address = NULL;
6286 authenticated_sender = NULL;
6287 deliver_localpart_orig = NULL;
6288 deliver_domain_orig = NULL;
6289 deliver_host = deliver_host_address = NULL;
6290 dnslist_domain = dnslist_matched = NULL;
6291 #ifdef WITH_CONTENT_SCAN
6292 malware_name = NULL;
6295 callout_address = NULL;
6296 sending_ip_address = NULL;
6297 deliver_localpart_data = deliver_domain_data =
6298 recipient_data = sender_data = NULL;
6300 lookup_value = NULL; /* Can be set by ACL */
6302 store_reset(reset_point);
6305 exim_exit(EXIT_SUCCESS); /* Never returns */
6306 return 0; /* To stop compiler warning */