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);
39 /*************************************************
40 * Function interface to store functions *
41 *************************************************/
43 /* We need some real functions to pass to the PCRE regular expression library
44 for store allocation via Exim's store manager. The normal calls are actually
45 macros that pass over location information to make tracing easier. These
46 functions just interface to the standard macro calls. A good compiler will
47 optimize out the tail recursion and so not make them too expensive. */
50 function_store_malloc(PCRE2_SIZE size, void * tag)
53 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "excessive memory alloc request");
54 return store_malloc((int)size);
58 function_store_free(void * block, void * tag)
60 /* At least some version of pcre2 pass a null pointer */
61 if (block) store_free(block);
66 function_store_get(PCRE2_SIZE size, void * tag)
69 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "excessive memory alloc request");
70 return store_get((int)size, GET_UNTAINTED); /* loses track of taint */
74 function_store_nullfree(void * block, void * tag)
76 /* We cannot free memory allocated using store_get() */
82 /*************************************************
83 * Enums for cmdline interface *
84 *************************************************/
86 enum commandline_info { CMDINFO_NONE=0,
87 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
95 pcre_mlc_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
96 pcre_gen_ctx = pcre2_general_context_create(function_store_get, function_store_nullfree, NULL);
98 pcre_mlc_cmp_ctx = pcre2_compile_context_create(pcre_mlc_ctx);
99 pcre_gen_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
101 pcre_gen_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
107 /*************************************************
108 * Execute regular expression and set strings *
109 *************************************************/
111 /* This function runs a regular expression match, and sets up the pointers to
112 the matched substrings. The matched strings are copied so the lifetime of
113 the subject is not a problem. Matched strings will have the same taint status
114 as the subject string (this is not a de-taint method, and must not be made so
115 given the support for wildcards in REs).
118 re the compiled expression
119 subject the subject string
120 options additional PCRE options
121 setup if < 0 do full setup
122 if >= 0 setup from setup+1 onwards,
123 excluding the full matched string
125 Returns: TRUE if matched, or FALSE
129 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
131 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
132 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
133 PCRE_EOPT | options, md, pcre_gen_mtc_ctx);
136 if ((yield = (res >= 0)))
138 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
139 res = pcre2_get_ovector_count(md);
140 expand_nmax = setup < 0 ? 0 : setup + 1;
141 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
143 /* Although PCRE2 has a pcre2_substring_get_bynumber() conveneience, it
144 seems to return a bad pointer when a capture group had no data, eg. (.*)
145 matching zero letters. So use the underlying ovec and hope (!) that the
146 offsets are sane (including that case). Should we go further and range-
147 check each one vs. the subject string length? */
148 int off = matchnum * 2;
149 int len = ovec[off + 1] - ovec[off];
150 expand_nstring[expand_nmax] = string_copyn(subject + ovec[off], len);
151 expand_nlength[expand_nmax++] = len;
155 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
158 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
159 debug_printf_indent("pcre2: %s\n", errbuf);
161 /* pcre2_match_data_free(md); gen ctx needs no free */
166 /* Check just for match with regex. Uses the common memory-handling.
170 subject string to be checked
171 slen length of subject; -1 for nul-terminated
172 rptr pointer for matched string, copied, or NULL
174 Return: TRUE for a match.
178 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
180 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
181 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
182 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
183 0, PCRE_EOPT, md, pcre_gen_mtc_ctx);
184 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
190 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
193 /* pcre2_match_data_free(md); gen ctx needs no free */
199 /*************************************************
200 * Set up processing details *
201 *************************************************/
203 /* Save a text string for dumping when SIGUSR1 is received.
204 Do checks for overruns.
206 Arguments: format and arguments, as for printf()
211 set_process_info(const char * format, ...)
213 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
219 g = string_fmt_append(&gs, "%5d ", (int)getpid());
220 len = gstring_length(g);
221 va_start(ap, format);
222 if (!string_vformat(g, 0, format, ap))
225 g = string_cat(&gs, US"**** string overflowed buffer ****");
227 g = string_catn(g, US"\n", 1);
228 process_info_len = len_string_from_gstring(g, &s);
229 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
233 /***********************************************
234 * Handler for SIGTERM *
235 ***********************************************/
238 term_handler(int sig)
240 exim_exit(EXIT_FAILURE);
244 /***********************************************
245 * Handler for SIGSEGV *
246 ***********************************************/
248 #define STACKDUMP_MAX 24
253 void * buf[STACKDUMP_MAX];
255 int nptrs = backtrace(buf, STACKDUMP_MAX);
257 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace");
258 log_write(0, LOG_MAIN|LOG_PANIC, "---");
259 if ((ss = backtrace_symbols(buf, nptrs)))
261 for (int i = 0; i < nptrs; i++)
262 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s", ss[i]);
266 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s", strerror(errno));
267 log_write(0, LOG_MAIN|LOG_PANIC, "---");
275 segv_handler(int sig, siginfo_t * info, void * uctx)
279 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
280 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
281 switch (info->si_code)
283 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
284 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
285 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
286 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
291 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (deliberate trap)");
292 else if (US info->si_addr < US 4096)
293 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
295 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
296 if (process_info_len > 0)
297 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%s: %.*s)",
298 process_purpose, process_info_len, process_info);
300 signal(SIGSEGV, SIG_DFL);
305 segv_handler(int sig)
307 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
308 if (process_info_len > 0)
309 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
311 signal(SIGSEGV, SIG_DFL);
317 /*************************************************
318 * Handler for SIGUSR1 *
319 *************************************************/
321 /* SIGUSR1 causes any exim process to write to the process log details of
322 what it is currently doing. It will only be used if the OS is capable of
323 setting up a handler that causes automatic restarting of any system call
324 that is in progress at the time.
326 This function takes care to be signal-safe.
328 Argument: the signal number (SIGUSR1)
333 usr1_handler(int sig)
337 os_restarting_signal(sig, usr1_handler);
339 if (!process_log_path) return;
340 fd = log_open_as_exim(process_log_path);
342 /* If we are neither exim nor root, or if we failed to create the log file,
343 give up. There is not much useful we can do with errors, since we don't want
344 to disrupt whatever is going on outside the signal handler. */
348 (void)write(fd, process_info, process_info_len);
354 /*************************************************
356 *************************************************/
358 /* This handler is enabled most of the time that Exim is running. The handler
359 doesn't actually get used unless alarm() has been called to set a timer, to
360 place a time limit on a system call of some kind. When the handler is run, it
363 There are some other SIGALRM handlers that are used in special cases when more
364 than just a flag setting is required; for example, when reading a message's
365 input. These are normally set up in the code module that uses them, and the
366 SIGALRM handler is reset to this one afterwards.
368 Argument: the signal value (SIGALRM)
373 sigalrm_handler(int sig)
376 os_non_restarting_signal(SIGALRM, sigalrm_handler);
381 /*************************************************
382 * Sleep for a fractional time interval *
383 *************************************************/
385 /* This function is called by millisleep() and exim_wait_tick() to wait for a
386 period of time that may include a fraction of a second. The coding is somewhat
387 tedious. We do not expect setitimer() ever to fail, but if it does, the process
388 will wait for ever, so we panic in this instance. (There was a case of this
389 when a bug in a function that calls milliwait() caused it to pass invalid data.
390 That's when I added the check. :-)
392 We assume it to be not worth sleeping for under 50us; this value will
393 require revisiting as hardware advances. This avoids the issue of
394 a zero-valued timer setting meaning "never fire".
396 Argument: an itimerval structure containing the interval
401 milliwait(struct itimerval *itval)
404 sigset_t old_sigmask;
405 int save_errno = errno;
407 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
409 (void)sigemptyset(&sigmask); /* Empty mask */
410 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
411 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
412 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
413 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
414 "setitimer() failed: %s", strerror(errno));
415 (void)sigfillset(&sigmask); /* All signals */
416 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
417 (void)sigsuspend(&sigmask); /* Until SIGALRM */
418 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
420 sigalrm_seen = FALSE;
426 /*************************************************
427 * Millisecond sleep function *
428 *************************************************/
430 /* The basic sleep() function has a granularity of 1 second, which is too rough
431 in some cases - for example, when using an increasing delay to slow down
434 Argument: number of millseconds
441 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
442 .it_value = {.tv_sec = msec/1000,
443 .tv_usec = (msec % 1000) * 1000}};
449 /*************************************************
450 * Compare microsecond times *
451 *************************************************/
458 Returns: -1, 0, or +1
462 exim_tvcmp(struct timeval *t1, struct timeval *t2)
464 if (t1->tv_sec > t2->tv_sec) return +1;
465 if (t1->tv_sec < t2->tv_sec) return -1;
466 if (t1->tv_usec > t2->tv_usec) return +1;
467 if (t1->tv_usec < t2->tv_usec) return -1;
474 /*************************************************
475 * Clock tick wait function *
476 *************************************************/
478 #ifdef _POSIX_MONOTONIC_CLOCK
479 # ifdef CLOCK_BOOTTIME
480 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
482 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
485 /* Amount EXIM_CLOCK is behind realtime, at startup. */
486 static struct timespec offset_ts;
489 exim_clock_init(void)
492 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
493 (void)gettimeofday(&tv, NULL);
494 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
495 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
496 if (offset_ts.tv_nsec >= 0) return;
498 offset_ts.tv_nsec += 1000*1000*1000;
504 exim_gettime(struct timeval * tv)
506 #ifdef _POSIX_MONOTONIC_CLOCK
507 struct timespec now_ts;
509 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
511 now_ts.tv_sec += offset_ts.tv_sec;
512 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
515 now_ts.tv_nsec -= 1000*1000*1000;
517 tv->tv_sec = now_ts.tv_sec;
518 tv->tv_usec = now_ts.tv_nsec / 1000;
522 (void)gettimeofday(tv, NULL);
526 /* Exim uses a time + a pid to generate a unique identifier in two places: its
527 message IDs, and in file names for maildir deliveries. Because some OS now
528 re-use pids within the same second, sub-second times are now being used.
529 However, for absolute certainty, we must ensure the clock has ticked before
530 allowing the relevant process to complete. At the time of implementation of
531 this code (February 2003), the speed of processors is such that the clock will
532 invariably have ticked already by the time a process has done its job. This
533 function prepares for the time when things are faster - and it also copes with
534 clocks that go backwards.
537 prev_tv A timeval which was used to create uniqueness; its usec field
538 has been rounded down to the value of the resolution.
539 We want to be sure the current time is greater than this.
540 On return, updated to current (rounded down).
541 resolution The resolution that was used to divide the microseconds
542 (1 for maildir, larger for message ids)
548 exim_wait_tick(struct timeval * prev_tv, int resolution)
550 struct timeval now_tv;
551 long int now_true_usec;
553 exim_gettime(&now_tv);
554 now_true_usec = now_tv.tv_usec;
555 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
557 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
559 struct itimerval itval;
560 itval.it_interval.tv_sec = 0;
561 itval.it_interval.tv_usec = 0;
562 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
563 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
565 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
566 negative value for the microseconds is possible only in the case when "now"
567 is more than a second less than "tgt". That means that itval.it_value.tv_sec
568 is greater than zero. The following correction is therefore safe. */
570 if (itval.it_value.tv_usec < 0)
572 itval.it_value.tv_usec += 1000000;
573 itval.it_value.tv_sec -= 1;
576 DEBUG(D_transport|D_receive)
578 if (!f.running_in_test_harness)
580 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
581 prev_tv->tv_sec, (long) prev_tv->tv_usec,
582 now_tv.tv_sec, (long) now_tv.tv_usec);
583 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
584 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
590 /* Be prapared to go around if the kernel does not implement subtick
591 granularity (GNU Hurd) */
593 exim_gettime(&now_tv);
594 now_true_usec = now_tv.tv_usec;
595 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
603 /*************************************************
604 * Call fopen() with umask 777 and adjust mode *
605 *************************************************/
607 /* Exim runs with umask(0) so that files created with open() have the mode that
608 is specified in the open() call. However, there are some files, typically in
609 the spool directory, that are created with fopen(). They end up world-writeable
610 if no precautions are taken. Although the spool directory is not accessible to
611 the world, this is an untidiness. So this is a wrapper function for fopen()
612 that sorts out the mode of the created file.
615 filename the file name
616 options the fopen() options
617 mode the required mode
619 Returns: the fopened FILE or NULL
623 modefopen(const uschar *filename, const char *options, mode_t mode)
625 mode_t saved_umask = umask(0777);
626 FILE *f = Ufopen(filename, options);
627 (void)umask(saved_umask);
628 if (f != NULL) (void)fchmod(fileno(f), mode);
633 /*************************************************
634 * Ensure stdin, stdout, and stderr exist *
635 *************************************************/
637 /* Some operating systems grumble if an exec() happens without a standard
638 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
639 file will be opened and will use these fd values, and then some other bit of
640 code will assume, for example, that it can write error messages to stderr.
641 This function ensures that fds 0, 1, and 2 are open if they do not already
642 exist, by connecting them to /dev/null.
644 This function is also used to ensure that std{in,out,err} exist at all times,
645 so that if any library that Exim calls tries to use them, it doesn't crash.
656 for (int i = 0; i <= 2; i++)
658 if (fstat(i, &statbuf) < 0 && errno == EBADF)
660 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
661 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
662 string_open_failed("/dev/null", NULL));
663 if (devnull != i) (void)dup2(devnull, i);
666 if (devnull > 2) (void)close(devnull);
672 /*************************************************
673 * Close unwanted file descriptors for delivery *
674 *************************************************/
676 /* This function is called from a new process that has been forked to deliver
677 an incoming message, either directly, or using exec.
679 We want any smtp input streams to be closed in this new process. However, it
680 has been observed that using fclose() here causes trouble. When reading in -bS
681 input, duplicate copies of messages have been seen. The files will be sharing a
682 file pointer with the parent process, and it seems that fclose() (at least on
683 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
684 least sometimes. Hence we go for closing the underlying file descriptors.
686 If TLS is active, we want to shut down the TLS library, but without molesting
687 the parent's SSL connection.
689 For delivery of a non-SMTP message, we want to close stdin and stdout (and
690 stderr unless debugging) because the calling process might have set them up as
691 pipes and be waiting for them to close before it waits for the submission
692 process to terminate. If they aren't closed, they hold up the calling process
693 until the initial delivery process finishes, which is not what we want.
695 Exception: We do want it for synchronous delivery!
697 And notwithstanding all the above, if D_resolver is set, implying resolver
698 debugging, leave stdout open, because that's where the resolver writes its
701 When we close stderr (which implies we've also closed stdout), we also get rid
702 of any controlling terminal.
714 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
716 (void)close(fileno(smtp_in));
717 (void)close(fileno(smtp_out));
722 (void)close(0); /* stdin */
723 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
724 if (debug_selector == 0) /* stderr */
726 if (!f.synchronous_delivery)
739 /*************************************************
741 *************************************************/
743 /* This function sets a new uid and gid permanently, optionally calling
744 initgroups() to set auxiliary groups. There are some special cases when running
745 Exim in unprivileged modes. In these situations the effective uid will not be
746 root; if we already have the right effective uid/gid, and don't need to
747 initialize any groups, leave things as they are.
752 igflag TRUE if initgroups() wanted
753 msg text to use in debugging output and failure log
755 Returns: nothing; bombs out on failure
759 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
761 uid_t euid = geteuid();
762 gid_t egid = getegid();
764 if (euid == root_uid || euid != uid || egid != gid || igflag)
766 /* At least one OS returns +1 for initgroups failure, so just check for
771 struct passwd *pw = getpwuid(uid);
773 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
774 "no passwd entry for uid=%ld", (long int)uid);
776 if (initgroups(pw->pw_name, gid) != 0)
777 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
778 (long int)uid, strerror(errno));
781 if (setgid(gid) < 0 || setuid(uid) < 0)
782 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
783 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
786 /* Debugging output included uid/gid and all groups */
790 int group_count, save_errno;
791 gid_t group_list[EXIM_GROUPLIST_SIZE];
792 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
793 (long int)geteuid(), (long int)getegid(), (long int)getpid());
794 group_count = getgroups(nelem(group_list), group_list);
796 debug_printf(" auxiliary group list:");
798 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
799 else if (group_count < 0)
800 debug_printf(" <error: %s>", strerror(save_errno));
801 else debug_printf(" <none>");
809 /*************************************************
811 *************************************************/
813 /* Exim exits via this function so that it always clears up any open
819 Returns: does not return
828 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
829 ">>>>>>>>>>>>>>>>\n",
830 (int)getpid(), process_purpose, rc);
836 exim_underbar_exit(int rc)
840 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
841 ">>>>>>>>>>>>>>>>\n",
842 (int)getpid(), process_purpose, rc);
848 /* Print error string, then die */
850 exim_fail(const char * fmt, ...)
854 vfprintf(stderr, fmt, ap);
859 /* fail if a length is too long */
861 exim_len_fail_toolong(int itemlen, int maxlen, const char * description)
863 if (itemlen <= maxlen)
865 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
866 itemlen, maxlen, description);
870 /* only pass through the string item back to the caller if it's short enough */
871 static inline const uschar *
872 exim_str_fail_toolong(const uschar * item, int maxlen, const char * description)
875 exim_fail("exim: bad item for: %s\n", description);
876 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
880 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
881 of chown()/fchown(). See src/functions.h for more explanation */
883 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
885 int saved_errno = errno; /* from the preceeding chown call */
887 log_write(0, LOG_MAIN|LOG_PANIC,
888 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
889 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
890 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
892 /* I leave this here, commented, in case the "bug"(?) comes up again.
893 It is not an Exim bug, but we can provide a workaround.
899 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
901 if (buf.st_uid == owner && buf.st_gid == group) return 0;
902 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
904 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
912 /* Bump the index for argv, checking for overflow,
913 and return the argument. */
915 static const uschar *
916 next_argv(const uschar ** argv, int * pi, int argc, const uschar * where)
919 if (++i >= argc) exim_fail("exim: bad item for: %s\n", where);
920 return argv[*pi = i];
924 /*************************************************
925 * Extract port from host address *
926 *************************************************/
928 /* Called to extract the port from the values given to -oMa and -oMi.
929 It also checks the syntax of the address, and terminates it before the
930 port data when a port is extracted.
933 address the address, with possible port on the end
935 Returns: the port, or zero if there isn't one
936 bombs out on a syntax error
940 check_port(uschar *address)
942 int port = host_address_extract_port(address);
943 if (string_is_ip_address(address, NULL) == 0)
944 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
950 /*************************************************
951 * Test/verify an address *
952 *************************************************/
954 /* This function is called by the -bv and -bt code. It extracts a working
955 address from a full RFC 822 address. This isn't really necessary per se, but it
956 has the effect of collapsing source routes.
960 flags flag bits for verify_address()
961 exit_value to be set for failures
967 test_address(uschar *s, int flags, int *exit_value)
969 int start, end, domain;
970 uschar *parse_error = NULL;
971 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
975 fprintf(stdout, "syntax error: %s\n", parse_error);
980 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
981 -1, -1, NULL, NULL, NULL);
982 if (rc == FAIL) *exit_value = 2;
983 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
989 /*************************************************
990 * Show supported features *
991 *************************************************/
994 show_string(BOOL is_stdout, gstring * g)
996 const uschar * s = string_from_gstring(g);
998 if (is_stdout) fputs(CCS s, stdout);
999 else debug_printf("%s", s);
1004 show_db_version(gstring * g)
1006 g = string_cat(g, US"Hints DB:\n");
1007 #ifdef DB_VERSION_STRING
1010 g = string_fmt_append(g, " Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
1011 g = string_fmt_append(g, " Runtime: %s\n",
1012 db_version(NULL, NULL, NULL));
1015 g = string_fmt_append(g, " Berkeley DB: %s\n", DB_VERSION_STRING);
1017 #elif defined(BTREEVERSION) && defined(HASHVERSION)
1019 g = string_cat(g, US" Probably Berkeley DB version 1.8x (native mode)\n");
1021 g = string_cat(g, US" Probably Berkeley DB version 1.8x (compatibility mode)\n");
1024 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
1025 g = string_cat(g, US" Probably ndbm\n");
1026 #elif defined(USE_SQLITE)
1027 g = string_cat(g, US" Using sqlite3\n");
1028 #elif defined(USE_TDB)
1029 g = string_cat(g, US" Using tdb\n");
1032 g = string_cat(g, US" Probably GDBM (native mode)\n");
1034 g = string_cat(g, US" Probably GDBM (compatibility mode)\n");
1042 lookup_show_supported(gstring * g)
1044 gstring * b = NULL, * d = NULL;
1046 #if defined(LOOKUP_LSEARCH)
1047 # if LOOKUP_LSEARCH!=2
1048 b = string_cat(b, US" lsearch wildlsearch nwildlsearch iplsearch");
1050 d = string_cat(d, US" lsearch wildlsearch nwildlsearch iplsearch");
1053 #if defined(LOOKUP_CDB)
1055 b = string_cat(b, US" cdb");
1057 d = string_cat(d, US" cdb");
1060 #if defined(LOOKUP_DBM)
1062 b = string_cat(b, US" dbm dbmjz dbmnz");
1064 d = string_cat(d, US" dbm dbmjz dbmnz");
1067 #if defined(LOOKUP_DNSDB)
1068 # if LOOKUP_DNSDB!=2
1069 b = string_cat(b, US" dnsdb");
1071 d = string_cat(d, US" dnsdb");
1074 #if defined(LOOKUP_DSEARCH)
1075 # if LOOKUP_DSEARCH!=2
1076 b = string_cat(b, US" dsearch");
1078 d = string_cat(d, US" dsearch");
1081 #if defined(LOOKUP_IBASE)
1082 # if LOOKUP_IBASE!=2
1083 b = string_cat(b, US" ibase");
1085 d = string_cat(d, US" ibase");
1088 #if defined(LOOKUP_JSON)
1090 b = string_cat(b, US" json");
1092 d = string_cat(d, US" json");
1095 #if defined(LOOKUP_LDAP)
1097 b = string_cat(b, US" ldap ldapdn ldapm");
1099 d = string_cat(d, US" ldap ldapdn ldapm");
1103 b = string_cat(b, US" lmdb");
1105 #if defined(LOOKUP_MYSQL)
1106 # if LOOKUP_MYSQL!=2
1107 b = string_cat(b, US" mysql");
1109 d = string_cat(d, US" mysql");
1112 #if defined(LOOKUP_NIS)
1114 b = string_cat(b, US" nis nis0");
1116 d = string_cat(d, US" nis nis0");
1119 #if defined(LOOKUP_NISPLUS)
1120 # if LOOKUP_NISPLUS!=2
1121 b = string_cat(b, US" nisplus");
1123 d = string_cat(d, US" nisplus");
1126 #if defined(LOOKUP_ORACLE)
1127 # if LOOKUP_ORACLE!=2
1128 b = string_cat(b, US" oracle");
1130 d = string_cat(d, US" oracle");
1133 #if defined(LOOKUP_PASSWD)
1134 # if LOOKUP_PASSWD!=2
1135 b = string_cat(b, US" passwd");
1137 d = string_cat(d, US" passwd");
1140 #if defined(LOOKUP_PGSQL)
1141 # if LOOKUP_PGSQL!=2
1142 b = string_cat(b, US" pgsql");
1144 d = string_cat(d, US" pgsql");
1147 #if defined(LOOKUP_REDIS)
1148 # if LOOKUP_REDIS!=2
1149 b = string_cat(b, US" redis");
1151 d = string_cat(d, US" redis");
1154 #if defined(LOOKUP_SQLITE)
1155 # if LOOKUP_SQLITE!=2
1156 b = string_cat(b, US" sqlite");
1158 d = string_cat(d, US" sqlite");
1161 #if defined(LOOKUP_TESTDB)
1162 # if LOOKUP_TESTDB!=2
1163 b = string_cat(b, US" testdb");
1165 d = string_cat(d, US" testdb");
1168 #if defined(LOOKUP_WHOSON)
1169 # if LOOKUP_WHOSON!=2
1170 b = string_cat(b, US" whoson");
1172 d = string_cat(d, US" whoson");
1176 if (b) g = string_fmt_append(g, "Lookups (built-in):%Y\n", b);
1177 if (d) g = string_fmt_append(g, "Lookups (dynamic): %Y\n", d);
1182 /* This function is called for -bV/--version and for -d to output the optional
1183 features of the current Exim binary.
1185 Arguments: BOOL, true for stdout else debug channel
1190 show_whats_supported(BOOL is_stdout)
1192 rmark reset_point = store_mark();
1195 DEBUG(D_any) {} else g = show_db_version(g);
1197 g = string_cat(g, US"Support for:");
1198 #ifdef WITH_CONTENT_SCAN
1199 g = string_cat(g, US" Content_Scanning");
1201 #ifdef SUPPORT_CRYPTEQ
1202 g = string_cat(g, US" crypteq");
1204 #ifdef EXPAND_DLFUNC
1205 g = string_cat(g, US" Expand_dlfunc");
1208 g = string_cat(g, US" iconv()");
1211 g = string_cat(g, US" IPv6");
1214 g = string_cat(g, US" PAM");
1217 g = string_cat(g, US" Perl");
1220 g = string_cat(g, US" GnuTLS");
1222 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1223 g = string_cat(g, US" move_frozen_messages");
1226 g = string_cat(g, US" OpenSSL");
1228 #if defined(CYRUS_PWCHECK_SOCKET)
1229 g = string_cat(g, US" pwcheck");
1231 #if defined(RADIUS_CONFIG_FILE)
1232 g = string_cat(g, US" radius");
1234 #ifndef DISABLE_TLS_RESUME
1235 g = string_cat(g, US" TLS_resume");
1237 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1238 g = string_cat(g, US" translate_ip_address");
1240 #ifdef USE_TCP_WRAPPERS
1241 g = string_cat(g, US" TCPwrappers");
1243 #ifdef HAVE_SETCLASSRESOURCES
1244 g = string_cat(g, US" use_setclassresources");
1247 g = string_cat(g, US" DANE");
1249 #ifndef DISABLE_DKIM
1250 g = string_cat(g, US" DKIM");
1252 #ifdef SUPPORT_DMARC
1253 g = string_cat(g, US" DMARC");
1255 #ifndef DISABLE_DNSSEC
1256 g = string_cat(g, US" DNSSEC");
1258 #ifndef DISABLE_ESMTP_LIMITS
1259 g = string_cat(g, US" ESMTP_Limits");
1261 #ifndef DISABLE_WELLKNOWN
1262 g = string_cat(g, US" ESMTP_Wellknown");
1264 #ifndef DISABLE_EVENT
1265 g = string_cat(g, US" Event");
1268 g = string_cat(g, US" I18N");
1270 #ifndef DISABLE_OCSP
1271 g = string_cat(g, US" OCSP");
1273 #ifndef DISABLE_PIPE_CONNECT
1274 g = string_cat(g, US" PIPECONNECT");
1276 #ifndef DISABLE_PRDR
1277 g = string_cat(g, US" PRDR");
1279 #ifdef SUPPORT_PROXY
1280 g = string_cat(g, US" PROXY");
1282 #ifndef DISABLE_QUEUE_RAMP
1283 g = string_cat(g, US" Queue_Ramp");
1285 #ifdef SUPPORT_SOCKS
1286 g = string_cat(g, US" SOCKS");
1289 g = string_cat(g, US" SPF");
1291 #if defined(SUPPORT_SRS)
1292 g = string_cat(g, US" SRS");
1296 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1298 #ifdef EXPERIMENTAL_ARC
1299 g = string_cat(g, US" Experimental_ARC");
1301 #ifdef EXPERIMENTAL_BRIGHTMAIL
1302 g = string_cat(g, US" Experimental_Brightmail");
1304 #ifdef EXPERIMENTAL_DCC
1305 g = string_cat(g, US" Experimental_DCC");
1307 #ifdef EXPERIMENTAL_DSN_INFO
1308 g = string_cat(g, US" Experimental_DSN_info");
1310 #ifdef EXPERIMENTAL_QUEUEFILE
1311 g = string_cat(g, US" Experimental_QUEUEFILE");
1313 #ifdef EXPERIMENTAL_XCLIENT
1314 g = string_cat(g, US" Experimental_XCLIENT");
1316 g = string_cat(g, US"\n");
1318 g = lookup_show_supported(g);
1319 g = auth_show_supported(g);
1320 g = route_show_supported(g);
1321 g = transport_show_supported(g);
1323 #ifdef WITH_CONTENT_SCAN
1324 g = malware_show_supported(g);
1326 show_string(is_stdout, g); g = NULL;
1328 if (fixed_never_users[0] > 0)
1331 g = string_cat(g, US"Fixed never_users: ");
1332 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1333 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1334 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1337 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1339 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1341 /* Everything else is details which are only worth reporting when debugging.
1342 Perhaps the tls_version_report should move into this too. */
1346 /* clang defines __GNUC__ (at least, for me) so test for it first */
1347 #if defined(__clang__)
1348 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1349 #elif defined(__GNUC__)
1351 g = string_fmt_append(g, "Compiler: GCC [%s]\n", __VERSION__);
1353 g = string_fmt_append(g, "Compiler: GCC [%s]\n", "? unknown version ?";
1356 g = string_cat(g, US"Compiler: <unknown>\n");
1359 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1360 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1361 __GLIBC__, __GLIBC_MINOR__);
1362 if (__GLIBC_PREREQ(2, 1))
1363 g = string_fmt_append(g, " Runtime: %s\n",
1364 gnu_get_libc_version());
1367 g = show_db_version(g);
1370 g = tls_version_report(g);
1373 g = utf8_version_report(g);
1375 #ifdef SUPPORT_DMARC
1376 g = dmarc_version_report(g);
1379 g = spf_lib_version_report(g);
1382 show_string(is_stdout, g);
1385 for (auth_info * ai= auths_available; *ai->drinfo.driver_name != '\0'; ai++)
1386 if (ai->version_report)
1387 g = (*ai->version_report)(g);
1389 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1390 characters; unless it's an ancient version of PCRE in which case it
1392 #ifndef PCRE_PRERELEASE
1393 # define PCRE_PRERELEASE
1396 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1399 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1400 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1402 PCRE2_MAJOR, PCRE2_MINOR,
1403 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1407 #undef EXPAND_AND_QUOTE
1409 show_string(is_stdout, g);
1413 for (int i = 0; i < lookup_list_count; i++)
1414 if (lookup_list[i]->version_report)
1415 g = lookup_list[i]->version_report(g);
1416 show_string(is_stdout, g);
1419 #ifdef WHITELIST_D_MACROS
1420 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1422 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1424 #ifdef TRUSTED_CONFIG_LIST
1425 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1427 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1431 show_string(is_stdout, g);
1432 store_reset(reset_point);
1436 /*************************************************
1437 * Show auxiliary information about Exim *
1438 *************************************************/
1441 show_exim_information(enum commandline_info request, FILE *stream)
1446 fprintf(stream, "Oops, something went wrong.\n");
1450 "The -bI: flag takes a string indicating which information to provide.\n"
1451 "If the string is not recognised, you'll get this help (on stderr).\n"
1453 " exim -bI:help this information\n"
1454 " exim -bI:dscp list of known dscp value keywords\n"
1455 " exim -bI:sieve list of supported sieve extensions\n"
1459 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1460 fprintf(stream, "%s\n", *pp);
1463 dscp_list_to_stream(stream);
1469 /*************************************************
1470 * Quote a local part *
1471 *************************************************/
1473 /* This function is used when a sender address or a From: or Sender: header
1474 line is being created from the caller's login, or from an authenticated_id. It
1475 applies appropriate quoting rules for a local part.
1477 Argument: the local part
1478 Returns: the local part, quoted if necessary
1482 local_part_quote(const uschar * lpart)
1484 BOOL needs_quote = FALSE;
1487 for (const uschar * t = lpart; !needs_quote && *t; t++)
1488 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1489 (*t != '.' || t == lpart || t[1] == 0);
1491 if (!needs_quote) return lpart;
1493 g = string_catn(NULL, US"\"", 1);
1497 uschar * nq = US Ustrpbrk(lpart, "\\\"");
1500 g = string_cat(g, lpart);
1503 g = string_catn(g, lpart, nq - lpart);
1504 g = string_catn(g, US"\\", 1);
1505 g = string_catn(g, nq, 1);
1509 g = string_catn(g, US"\"", 1);
1510 return string_from_gstring(g);
1516 /*************************************************
1517 * Load readline() functions *
1518 *************************************************/
1520 /* This function is called from testing executions that read data from stdin,
1521 but only when running as the calling user. Currently, only -be does this. The
1522 function loads the readline() function library and passes back the functions.
1523 On some systems, it needs the curses library, so load that too, but try without
1524 it if loading fails. All this functionality has to be requested at build time.
1527 fn_readline_ptr pointer to where to put the readline pointer
1528 fn_addhist_ptr pointer to where to put the addhistory function
1530 Returns: the dlopen handle or NULL on failure
1534 set_readline(char * (**fn_readline_ptr)(const char *),
1535 void (**fn_addhist_ptr)(const char *))
1538 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1540 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1541 if (dlhandle_curses) dlclose(dlhandle_curses);
1545 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1546 * char * readline (const char *prompt);
1547 * void add_history (const char *string);
1549 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1550 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1553 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1561 /*************************************************
1562 * Get a line from stdin for testing things *
1563 *************************************************/
1565 /* This function is called when running tests that can take a number of lines
1566 of input (for example, -be and -bt). It handles continuations and trailing
1567 spaces. And prompting and a blank line output on eof. If readline() is in use,
1568 the arguments are non-NULL and provide the relevant functions.
1571 fn_readline readline function or NULL
1572 fn_addhist addhist function or NULL
1574 Returns: pointer to dynamic memory, or NULL at end of file
1578 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1581 BOOL had_input = FALSE;
1583 if (!fn_readline) { printf("> "); fflush(stdout); }
1585 for (int i = 0;; i++)
1587 uschar buffer[1024];
1591 char *readline_line = NULL;
1594 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1595 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1596 p = US readline_line;
1601 /* readline() not in use */
1604 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1608 /* Handle the line */
1611 ss = p + Ustrlen(p);
1612 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1615 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1617 g = string_catn(g, p, ss - p);
1620 if (fn_readline) free(readline_line);
1623 /* g can only be NULL if ss==p */
1624 if (ss == p || gstring_last_char(g) != '\\') /* not continuation; done */
1627 gstring_trim(g, 1); /* drop the \ */
1630 if (had_input) return g ? string_from_gstring(g) : US"";
1637 /*************************************************
1638 * Output usage information for the program *
1639 *************************************************/
1641 /* This function is called when there are no recipients
1642 or a specific --help argument was added.
1645 progname information on what name we were called by
1647 Returns: DOES NOT RETURN
1651 exim_usage(const uschar * progname)
1654 /* Handle specific program invocation variants */
1655 if (Ustrcmp(progname, US"-mailq") == 0)
1657 "mailq - list the contents of the mail queue\n\n"
1658 "For a list of options, see the Exim documentation.\n");
1660 /* Generic usage - we output this whatever happens */
1662 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1663 "not directly from a shell command line. Options and/or arguments control\n"
1664 "what it does when called. For a list of options, see the Exim documentation.\n");
1669 /*************************************************
1670 * Validate that the macros given are okay *
1671 *************************************************/
1673 /* Typically, Exim will drop privileges if macros are supplied. In some
1674 cases, we want to not do so.
1676 Arguments: opt_D_used - true if the commandline had a "-D" option
1677 Returns: true if trusted, false otherwise
1681 macros_trusted(BOOL opt_D_used)
1683 #ifdef WHITELIST_D_MACROS
1684 uschar *whitelisted, *end, *p, **whites;
1685 int white_count, i, n;
1687 BOOL prev_char_item, found;
1692 #ifndef WHITELIST_D_MACROS
1696 /* We only trust -D overrides for some invoking users:
1697 root, the exim run-time user, the optional config owner user.
1698 I don't know why config-owner would be needed, but since they can own the
1699 config files anyway, there's no security risk to letting them override -D. */
1700 if ( ! ((real_uid == root_uid)
1701 || (real_uid == exim_uid)
1702 #ifdef CONFIGURE_OWNER
1703 || (real_uid == config_uid)
1707 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1711 /* Get a list of macros which are whitelisted */
1712 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1713 prev_char_item = FALSE;
1715 for (p = whitelisted; *p != '\0'; ++p)
1717 if (*p == ':' || isspace(*p))
1722 prev_char_item = FALSE;
1725 if (!prev_char_item)
1726 prev_char_item = TRUE;
1733 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1734 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1739 if (i == white_count)
1741 while (*p != '\0' && p < end)
1747 /* The list of commandline macros should be very short.
1748 Accept the N*M complexity. */
1749 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1752 for (uschar ** w = whites; *w; ++w)
1753 if (Ustrcmp(*w, m->name) == 0)
1760 if (!m->replacement)
1762 if ((len = m->replen) == 0)
1764 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1767 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1773 /*************************************************
1774 * Expansion testing *
1775 *************************************************/
1777 /* Expand and print one item, doing macro-processing.
1780 item line for expansion
1784 expansion_test_line(const uschar * line)
1790 Ustrncpy(big_buffer, line, big_buffer_size);
1791 big_buffer[big_buffer_size-1] = '\0';
1792 len = Ustrlen(big_buffer);
1794 (void) macros_expand(0, &len, &dummy_macexp);
1796 if (isupper(big_buffer[0]))
1798 if (macro_read_assignment(big_buffer))
1799 printf("Defined macro '%s'\n", mlast->name);
1801 else if (Ustrncmp(big_buffer, "set,t ", 6) == 0)
1802 printf("%s\n", acl_standalone_setvar(big_buffer+6, TRUE));
1803 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1804 printf("%s\n", acl_standalone_setvar(big_buffer+4, FALSE));
1806 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1807 else printf("Failed: %s\n", expand_string_message);
1812 /*************************************************
1813 * Queue-runner operations *
1814 *************************************************/
1816 /* Prefix a new qrunner descriptor to the qrunners list */
1821 qrunner * q = qrunners;
1822 qrunners = store_get(sizeof(qrunner), GET_UNTAINTED);
1823 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1825 qrunners->next_tick = time(NULL); /* run right away */
1830 alloc_onetime_qrunner(void)
1832 qrunners = store_get_perm(sizeof(qrunner), GET_UNTAINTED);
1833 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1834 qrunners->next_tick = time(NULL); /* run right away */
1835 qrunners->run_max = 1;
1840 /*************************************************
1841 * Entry point and high-level code *
1842 *************************************************/
1844 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1845 the appropriate action. All the necessary functions are present in the one
1846 binary. I originally thought one should split it up, but it turns out that so
1847 much of the apparatus is needed in each chunk that one might as well just have
1848 it all available all the time, which then makes the coding easier as well.
1851 argc count of entries in argv
1852 argv argument strings, with argv[0] being the program name
1854 Returns: EXIT_SUCCESS if terminated successfully
1855 EXIT_FAILURE otherwise, except when a message has been sent
1856 to the sender, and -oee was given
1860 main(int argc, char ** cargv)
1862 const uschar ** argv = CUSS cargv;
1863 int arg_receive_timeout = -1;
1864 int arg_smtp_receive_timeout = -1;
1865 int arg_error_handling = error_handling;
1866 int filter_sfd = -1;
1867 int filter_ufd = -1;
1870 int list_queue_option = QL_BASIC;
1872 int msg_action_arg = -1;
1873 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1874 int queue_only_reason = 0;
1876 int perl_start_option = 0;
1878 int recipients_arg = argc;
1879 int sender_address_domain = 0;
1880 int test_retry_arg = -1;
1881 int test_rewrite_arg = -1;
1882 gid_t original_egid;
1883 BOOL arg_queue_only = FALSE;
1884 BOOL bi_option = FALSE;
1885 BOOL checking = FALSE;
1886 BOOL count_queue = FALSE;
1887 BOOL expansion_test = FALSE;
1888 BOOL extract_recipients = FALSE;
1889 BOOL flag_G = FALSE;
1890 BOOL flag_n = FALSE;
1891 BOOL forced_delivery = FALSE;
1892 BOOL f_end_dot = FALSE;
1893 BOOL deliver_give_up = FALSE;
1894 BOOL list_queue = FALSE;
1895 BOOL list_options = FALSE;
1896 BOOL list_config = FALSE;
1897 BOOL local_queue_only;
1898 BOOL one_msg_action = FALSE;
1899 BOOL opt_D_used = FALSE;
1900 BOOL queue_only_set = FALSE;
1901 BOOL receiving_message = TRUE;
1902 BOOL sender_ident_set = FALSE;
1903 BOOL session_local_queue_only;
1905 BOOL removed_privilege = FALSE;
1906 BOOL usage_wanted = FALSE;
1907 BOOL verify_address_mode = FALSE;
1908 BOOL verify_as_sender = FALSE;
1909 BOOL rcpt_verify_quota = FALSE;
1910 BOOL version_printed = FALSE;
1911 const uschar * alias_arg = NULL;
1912 const uschar * called_as = US"";
1913 const uschar * cmdline_syslog_name = NULL;
1914 const uschar * start_queue_run_id = NULL;
1915 const uschar * stop_queue_run_id = NULL;
1916 const uschar * expansion_test_message = NULL;
1917 const uschar * ftest_domain = NULL;
1918 const uschar * ftest_localpart = NULL;
1919 const uschar * ftest_prefix = NULL;
1920 const uschar * ftest_suffix = NULL;
1921 uschar * log_oneline = NULL;
1922 const uschar * malware_test_file = NULL;
1923 const uschar * real_sender_address;
1924 uschar * originator_home = US"/";
1928 struct stat statbuf;
1929 pid_t passed_qr_pid = (pid_t)0;
1930 int passed_qr_pipe = -1;
1931 gid_t group_list[EXIM_GROUPLIST_SIZE];
1933 /* For the -bI: flag */
1934 enum commandline_info info_flag = CMDINFO_NONE;
1935 BOOL info_stdout = FALSE;
1937 /* Possible options for -R and -S */
1939 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1941 /* Need to define this in case we need to change the environment in order
1942 to get rid of a bogus time zone. We have to make it char rather than uschar
1943 because some OS define it in /usr/include/unistd.h. */
1945 extern char **environ;
1947 #ifdef MEASURE_TIMING
1948 (void)gettimeofday(×tamp_startup, NULL);
1951 store_init(); /* Initialise the memory allocation susbsystem */
1952 pcre_init(); /* Set up memory handling for pcre */
1954 /* If the Exim user and/or group and/or the configuration file owner/group were
1955 defined by ref:name at build time, we must now find the actual uid/gid values.
1956 This is a feature to make the lives of binary distributors easier. */
1958 #ifdef EXIM_USERNAME
1959 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1962 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1964 /* If ref:name uses a number as the name, route_finduser() returns
1965 TRUE with exim_uid set and pw coerced to NULL. */
1967 exim_gid = pw->pw_gid;
1968 #ifndef EXIM_GROUPNAME
1971 "exim: ref:name should specify a usercode, not a group.\n"
1972 "exim: can't let you get away with it unless you also specify a group.\n");
1976 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1979 #ifdef EXIM_GROUPNAME
1980 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1981 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1984 #ifdef CONFIGURE_OWNERNAME
1985 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1986 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1987 CONFIGURE_OWNERNAME);
1990 /* We default the system_filter_user to be the Exim run-time user, as a
1991 sane non-root value. */
1992 system_filter_uid = exim_uid;
1994 #ifdef CONFIGURE_GROUPNAME
1995 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1996 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1997 CONFIGURE_GROUPNAME);
2000 /* In the Cygwin environment, some initialization used to need doing.
2001 It was fudged in by means of this macro; now no longer but we'll leave
2002 it in case of others. */
2008 /* Check a field which is patched when we are running Exim within its
2009 testing harness; do a fast initial check, and then the whole thing. */
2011 f.running_in_test_harness =
2012 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
2013 if (f.running_in_test_harness)
2016 /* Protect against abusive argv[0] */
2017 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
2018 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
2020 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
2021 at the start of a program; however, it seems that some environments do not
2022 follow this. A "strange" locale can affect the formatting of timestamps, so we
2025 setlocale(LC_ALL, "C");
2027 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
2029 #ifdef _POSIX_MONOTONIC_CLOCK
2033 /* Set up the default handler for timing using alarm(). */
2035 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2037 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
2038 because store_malloc writes a log entry on failure. */
2040 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
2041 exim_fail("exim: failed to get store for log buffer\n");
2043 /* Initialize the default log options. */
2045 bits_set(log_selector, log_selector_size, log_default);
2047 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
2048 NULL when the daemon is run and the file is closed. We have to use this
2049 indirection, because some systems don't allow writing to the variable "stderr".
2052 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
2054 /* Ensure there is a big buffer for temporary use in several places. It is put
2055 in malloc store so that it can be freed for enlargement if necessary. */
2057 big_buffer = store_malloc(big_buffer_size);
2059 /* Set up the handler for the data request signal, and set the initial
2060 descriptive text. */
2062 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
2063 set_process_info("initializing");
2064 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
2067 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
2068 sigaction(SIGSEGV, &act, NULL);
2071 signal(SIGSEGV, segv_handler); /* log faults */
2074 /* If running in a dockerized environment, the TERM signal is only
2075 delegated to the PID 1 if we request it by setting an signal handler */
2077 if (getpid() == 1) signal(SIGTERM, term_handler);
2079 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
2080 in the daemon code. For the rest of Exim's uses, we ignore it. */
2082 signal(SIGHUP, SIG_IGN);
2084 /* We don't want to die on pipe errors as the code is written to handle
2085 the write error instead. */
2087 signal(SIGPIPE, SIG_IGN);
2089 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
2090 set to SIG_IGN. This causes subprocesses that complete before the parent
2091 process waits for them not to hang around, so when Exim calls wait(), nothing
2092 is there. The wait() code has been made robust against this, but let's ensure
2093 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
2094 ending status. We use sigaction rather than plain signal() on those OS where
2095 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
2096 problem on AIX with this.) */
2100 struct sigaction act;
2101 act.sa_handler = SIG_DFL;
2102 sigemptyset(&(act.sa_mask));
2104 sigaction(SIGCHLD, &act, NULL);
2107 signal(SIGCHLD, SIG_DFL);
2110 /* Save the arguments for use if we re-exec exim as a daemon after receiving
2115 /* Set up the version number. Set up the leading 'E' for the external form of
2116 message ids, set the pointer to the internal form, and initialize it to
2117 indicate no message being processed. */
2120 message_id_option[0] = '-';
2121 message_id_external = message_id_option + 1;
2122 message_id_external[0] = 'E';
2123 message_id = message_id_external + 1;
2126 /* Set the umask to zero so that any files Exim creates using open() are
2127 created with the modes that it specifies. NOTE: Files created with fopen() have
2128 a problem, which was not recognized till rather late (February 2006). With this
2129 umask, such files will be world writeable. (They are all content scanning files
2130 in the spool directory, which isn't world-accessible, so this is not a
2131 disaster, but it's untidy.) I don't want to change this overall setting,
2132 however, because it will interact badly with the open() calls. Instead, there's
2133 now a function called modefopen() that fiddles with the umask while calling
2138 /* Precompile the regular expression for matching a message id. Keep this in
2139 step with the code that generates ids in the accept.c module. We need to do
2140 this here, because the -M options check their arguments for syntactic validity
2141 using mac_ismsgid, which uses this. */
2144 regex_must_compile(US"^(?:"
2145 "[^\\W_]{" str(MESSAGE_ID_TIME_LEN) "}"
2146 "-[^\\W_]{" str(MESSAGE_ID_PID_LEN) "}"
2147 "-[^\\W_]{" str(MESSAGE_ID_SUBTIME_LEN) "}"
2149 "(?:[^\\W_]{6}-){2}[^\\W_]{2}" /* old ID format */
2153 /* Precompile the regular expression that is used for matching an SMTP error
2154 code, possibly extended, at the start of an error message. Note that the
2155 terminating whitespace character is included. */
2158 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2161 #ifdef WHITELIST_D_MACROS
2162 /* Precompile the regular expression used to filter the content of macros
2163 given to -D for permissibility. */
2165 regex_whitelisted_macro =
2166 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2169 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2170 this seems to be a generally accepted convention, since one finds symbolic
2171 links called "mailq" in standard OS configurations. */
2173 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2174 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2177 receiving_message = FALSE;
2178 called_as = US"-mailq";
2181 /* If the program is called as "rmail" treat it as equivalent to
2182 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2183 i.e. preventing a single dot on a line from terminating the message, and
2184 returning with zero return code, even in cases of error (provided an error
2185 message has been sent). */
2187 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2188 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2191 called_as = US"-rmail";
2192 errors_sender_rc = EXIT_SUCCESS;
2195 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2196 this is a smail convention. */
2198 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2199 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2201 smtp_input = smtp_batched_input = TRUE;
2202 called_as = US"-rsmtp";
2205 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2206 this is a smail convention. */
2208 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2209 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2211 alloc_onetime_qrunner();
2212 receiving_message = FALSE;
2213 called_as = US"-runq";
2216 /* If the program is called as "newaliases" treat it as equivalent to
2217 "exim -bi"; this is a sendmail convention. */
2219 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2220 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2223 receiving_message = FALSE;
2224 called_as = US"-newaliases";
2227 /* Save the original effective uid for a couple of uses later. It should
2228 normally be root, but in some esoteric environments it may not be. */
2230 original_euid = geteuid();
2231 original_egid = getegid();
2233 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2234 to be the same as the real ones. This makes a difference only if Exim is setuid
2235 (or setgid) to something other than root, which could be the case in some
2236 special configurations. */
2238 real_uid = getuid();
2239 real_gid = getgid();
2241 if (real_uid == root_uid)
2243 if ((rv = setgid(real_gid)))
2244 exim_fail("exim: setgid(%ld) failed: %s\n",
2245 (long int)real_gid, strerror(errno));
2246 if ((rv = setuid(real_uid)))
2247 exim_fail("exim: setuid(%ld) failed: %s\n",
2248 (long int)real_uid, strerror(errno));
2251 /* If neither the original real uid nor the original euid was root, Exim is
2252 running in an unprivileged state. */
2254 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2256 /* For most of the args-parsing we need to use permanent pool memory */
2258 int old_pool = store_pool;
2259 store_pool = POOL_PERM;
2261 /* Scan the program's arguments. Some can be dealt with right away; others are
2262 simply recorded for checking and handling afterwards. Do a high-level switch
2263 on the second character (the one after '-'), to save some effort. */
2265 for (i = 1; i < argc; i++)
2267 BOOL badarg = FALSE;
2268 const uschar * arg = argv[i];
2269 const uschar * argrest;
2272 /* An argument not starting with '-' is the start of a recipients list;
2273 break out of the options-scanning loop. */
2281 /* An option consisting of -- terminates the options */
2283 if (Ustrcmp(arg, "--") == 0)
2285 recipients_arg = i + 1;
2289 /* Handle flagged options */
2291 switchchar = arg[1];
2294 /* Make all -ex options synonymous with -oex arguments, since that
2295 is assumed by various callers. Also make -qR options synonymous with -R
2296 options, as that seems to be required as well. Allow for -qqR too, and
2297 the same for -S options. */
2299 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2300 Ustrncmp(arg+1, "qR", 2) == 0 ||
2301 Ustrncmp(arg+1, "qS", 2) == 0)
2303 switchchar = arg[2];
2306 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2308 switchchar = arg[3];
2310 f.queue_2stage = TRUE;
2313 /* Make -r synonymous with -f, since it is a documented alias */
2315 else if (arg[1] == 'r') switchchar = 'f';
2317 /* Make -ov synonymous with -v */
2319 else if (Ustrcmp(arg, "-ov") == 0)
2325 /* deal with --option_aliases */
2326 else if (switchchar == '-')
2328 if (Ustrcmp(argrest, "help") == 0)
2330 usage_wanted = TRUE;
2333 else if (Ustrcmp(argrest, "version") == 0)
2340 /* High-level switch on active initial letter */
2345 /* sendmail uses -Ac and -Am to control which .cf file is used;
2348 if (!*argrest) { badarg = TRUE; break; }
2351 BOOL ignore = FALSE;
2356 if (*(argrest + 1) == '\0')
2360 if (!ignore) badarg = TRUE;
2364 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2365 so has no need of it. */
2368 if (!*argrest) i++; /* Skip over the type */
2374 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2378 /* -bd: Run in daemon mode, awaiting SMTP connections.
2379 -bdf: Ditto, but in the foreground.
2382 f.daemon_listen = f.daemon_scion = TRUE;
2383 if (*argrest == 'f') f.background_daemon = FALSE;
2384 else if (*argrest) badarg = TRUE;
2387 /* -be: Run in expansion test mode
2388 -bem: Ditto, but read a message from a file first
2391 expansion_test = checking = TRUE;
2392 if (*argrest == 'm')
2394 if (++i >= argc) { badarg = TRUE; break; }
2395 expansion_test_message = argv[i];
2398 if (*argrest) badarg = TRUE;
2401 /* -bF: Run system filter test */
2403 filter_test |= checking = FTEST_SYSTEM;
2404 if (*argrest) badarg = TRUE;
2405 else if (++i < argc) filter_test_sfile = argv[i];
2406 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2409 /* -bf: Run user filter test
2410 -bfd: Set domain for filter testing
2411 -bfl: Set local part for filter testing
2412 -bfp: Set prefix for filter testing
2413 -bfs: Set suffix for filter testing
2418 filter_test |= checking = FTEST_USER;
2419 if (++i < argc) filter_test_ufile = argv[i];
2420 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2425 exim_fail("exim: string expected after %s\n", arg);
2426 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2427 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2428 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2429 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2434 /* -bh: Host checking - an IP address must follow. */
2436 if ( (!*argrest || Ustrcmp(argrest, "c") == 0)
2439 sender_host_address = string_copy_taint(
2440 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2442 host_checking = checking = f.log_testing_mode = TRUE;
2443 f.host_checking_callout = *argrest == 'c';
2444 message_logs = FALSE;
2450 /* -bi: This option is used by sendmail to initialize *the* alias file,
2451 though it has the -oA option to specify a different file. Exim has no
2452 concept of *the* alias file, but since Sun's YP make script calls
2453 sendmail this way, some support must be provided. */
2455 if (!*argrest) bi_option = TRUE;
2459 /* -bI: provide information, of the type to follow after a colon.
2460 This is an Exim flag. */
2462 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2464 const uschar * p = argrest+1;
2465 info_flag = CMDINFO_HELP;
2467 if (strcmpic(p, CUS"sieve") == 0)
2469 info_flag = CMDINFO_SIEVE;
2472 else if (strcmpic(p, CUS"dscp") == 0)
2474 info_flag = CMDINFO_DSCP;
2477 else if (strcmpic(p, CUS"help") == 0)
2483 /* -bm: Accept and deliver message - the default option. Reinstate
2484 receiving_message, which got turned off for all -b options.
2485 -bmalware: test the filename given for malware */
2487 if (!*argrest) receiving_message = TRUE;
2488 else if (Ustrcmp(argrest, "alware") == 0)
2490 if (++i >= argc) { badarg = TRUE; break; }
2492 malware_test_file = argv[i];
2497 /* -bnq: For locally originating messages, do not qualify unqualified
2498 addresses. In the envelope, this causes errors; in header lines they
2501 if (Ustrcmp(argrest, "q") == 0)
2503 f.allow_unqualified_sender = FALSE;
2504 f.allow_unqualified_recipient = FALSE;
2509 /* -bpxx: List the contents of the mail queue, in various forms. If
2510 the option is -bpc, just a queue count is needed. Otherwise, if the
2511 first letter after p is r, then order is random. */
2513 if (*argrest == 'c')
2516 if (*++argrest) badarg = TRUE;
2520 if (*argrest == 'r')
2521 list_queue_option = QL_UNSORTED, argrest++;
2523 list_queue_option = QL_BASIC;
2527 /* -bp: List the contents of the mail queue, top-level only */
2531 /* -bpu: List the contents of the mail queue, top-level undelivered */
2533 else if (Ustrcmp(argrest, "u") == 0) list_queue_option |= QL_UNDELIVERED_ONLY;
2535 /* -bpa: List the contents of the mail queue, including all delivered */
2537 else if (Ustrcmp(argrest, "a") == 0) list_queue_option |= QL_PLUS_GENERATED;
2539 /* -bpi: List only message IDs */
2541 else if (Ustrcmp(argrest, "i") == 0) list_queue_option |= QL_MSGID_ONLY;
2543 /* Unknown after -bp[r] */
2549 /* -bP: List the configuration variables given as the address list.
2550 Force -v, so configuration errors get displayed. */
2553 /* -bP config: we need to setup here, because later,
2554 when list_options is checked, the config is read already */
2557 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2560 readconf_save_config(version_string);
2564 list_options = TRUE;
2565 debug_selector |= D_v;
2566 debug_file = stderr;
2570 /* -brt: Test retry configuration lookup */
2572 if (Ustrcmp(argrest, "t") == 0)
2575 test_retry_arg = i + 1;
2579 /* -brw: Test rewrite configuration */
2581 else if (Ustrcmp(argrest, "w") == 0)
2584 test_rewrite_arg = i + 1;
2590 /* -bS: Read SMTP commands on standard input, but produce no replies -
2591 all errors are reported by sending messages. */
2594 smtp_input = smtp_batched_input = receiving_message = TRUE;
2598 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2599 on standard output. */
2601 if (!*argrest) smtp_input = receiving_message = TRUE;
2605 /* -bt: address testing mode */
2608 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2612 /* -bv: verify addresses */
2615 verify_address_mode = checking = f.log_testing_mode = TRUE;
2617 /* -bvs: verify sender addresses */
2619 else if (Ustrcmp(argrest, "s") == 0)
2621 verify_address_mode = checking = f.log_testing_mode = TRUE;
2622 verify_as_sender = TRUE;
2627 /* -bV: Print version string and support details */
2631 printf("Exim version %s #%s built %s\n", version_string,
2632 version_cnumber, version_date);
2633 printf("%s\n", CS version_copyright);
2634 version_printed = TRUE;
2635 show_whats_supported(TRUE);
2636 f.log_testing_mode = TRUE;
2641 /* -bw: inetd wait mode, accept a listening socket as stdin */
2643 f.inetd_wait_mode = TRUE;
2644 f.background_daemon = FALSE;
2645 f.daemon_listen = f.daemon_scion = TRUE;
2647 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2648 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2659 /* -C: change configuration file list; ignore if it isn't really
2660 a change! Enforce a prefix check if required. */
2664 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2665 if (Ustrcmp(config_main_filelist, argrest) != 0)
2667 #ifdef ALT_CONFIG_PREFIX
2669 int len = Ustrlen(ALT_CONFIG_PREFIX);
2670 const uschar *list = argrest;
2672 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2673 while((filename = string_nextinlist(&list, &sep, big_buffer,
2675 if ( ( Ustrlen(filename) < len
2676 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2677 || Ustrstr(filename, "/../") != NULL
2679 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2681 exim_fail("-C Permission denied\n");
2683 if (real_uid != root_uid)
2685 #ifdef TRUSTED_CONFIG_LIST
2687 if (real_uid != exim_uid
2688 #ifdef CONFIGURE_OWNER
2689 && real_uid != config_uid
2692 f.trusted_config = FALSE;
2695 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2698 struct stat statbuf;
2700 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2701 (statbuf.st_uid != root_uid /* owner not root */
2702 #ifdef CONFIGURE_OWNER
2703 && statbuf.st_uid != config_uid /* owner not the special one */
2706 (statbuf.st_gid != root_gid /* group not root */
2707 #ifdef CONFIGURE_GROUP
2708 && statbuf.st_gid != config_gid /* group not the special one */
2710 && (statbuf.st_mode & 020) != 0 /* group writeable */
2712 (statbuf.st_mode & 2) != 0) /* world writeable */
2714 f.trusted_config = FALSE;
2719 /* Well, the trust list at least is up to scratch... */
2721 uschar *trusted_configs[32];
2724 int old_pool = store_pool;
2725 store_pool = POOL_MAIN;
2727 reset_point = store_mark();
2728 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2730 uschar * start = big_buffer, * nl;
2731 if (Uskip_whitespace(&start) != '/')
2733 if ((nl = Ustrchr(start, '\n')))
2735 trusted_configs[nr_configs++] = string_copy(start);
2736 if (nr_configs == nelem(trusted_configs))
2744 const uschar *list = argrest;
2746 while (f.trusted_config && (filename = string_nextinlist(&list,
2747 &sep, big_buffer, big_buffer_size)))
2749 for (i=0; i < nr_configs; i++)
2750 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2752 if (i == nr_configs)
2754 f.trusted_config = FALSE;
2759 else /* No valid prefixes found in trust_list file. */
2760 f.trusted_config = FALSE;
2761 store_reset(reset_point);
2762 store_pool = old_pool;
2765 else /* Could not open trust_list file. */
2766 f.trusted_config = FALSE;
2769 /* Not root; don't trust config */
2770 f.trusted_config = FALSE;
2774 config_main_filelist = argrest;
2775 f.config_changed = TRUE;
2780 /* -D: set up a macro definition */
2783 #ifdef DISABLE_D_OPTION
2784 exim_fail("exim: -D is not available in this Exim binary\n");
2790 const uschar * s = argrest;
2793 Uskip_whitespace(&s);
2795 if (*s < 'A' || *s > 'Z')
2796 exim_fail("exim: macro name set by -D must start with "
2797 "an upper case letter\n");
2799 while (isalnum(*s) || *s == '_')
2801 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2805 if (ptr == 0) { badarg = TRUE; break; }
2806 if (Uskip_whitespace(&s))
2808 if (*s++ != '=') { badarg = TRUE; break; }
2809 Uskip_whitespace(&s);
2812 for (m = macros_user; m; m = m->next)
2813 if (Ustrcmp(m->name, name) == 0)
2814 exim_fail("exim: duplicated -D in command line\n");
2816 m = macro_create(name, s, TRUE);
2818 if (clmacro_count >= MAX_CLMACROS)
2819 exim_fail("exim: too many -D options on command line\n");
2820 clmacros[clmacro_count++] =
2821 string_sprintf("-D%s=%s", m->name, m->replacement);
2828 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2830 if (Ustrcmp(argrest, "ropcr") == 0)
2832 /* drop_cr = TRUE; */
2835 /* -dp: Set up a debug pretrigger buffer with given size. */
2837 else if (Ustrcmp(argrest, "p") == 0)
2841 debug_pretrigger_setup(argv[i]);
2843 /* -dt: Set a debug trigger selector */
2845 else if (Ustrncmp(argrest, "t=", 2) == 0)
2846 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2848 /* -d: Set debug level (see also -v below).
2849 If -dd is used, debugging subprocesses of the daemon is disabled. */
2853 /* Use an intermediate variable so that we don't set debugging while
2854 decoding the debugging bits. */
2856 unsigned int selector = D_default;
2859 if (*argrest == 'd')
2861 f.debug_daemon = TRUE;
2865 decode_bits(&selector, 1, debug_notall, argrest,
2866 debug_options, debug_options_count, US"debug", 0);
2867 debug_selector = selector;
2872 /* -E: This is a local error message. This option is not intended for
2873 external use at all, but is not restricted to trusted callers because it
2874 does no harm (just suppresses certain error messages) and if Exim is run
2875 not setuid root it won't always be trusted when it generates error
2876 messages using this option. If there is a message id following -E, point
2877 message_reference at it, for logging. */
2880 f.local_error_message = TRUE;
2881 if (mac_ismsgid(argrest)) message_reference = argrest;
2885 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2886 option, so it looks as if historically the -oex options are also callable
2887 without the leading -o. So we have to accept them. Before the switch,
2888 anything starting -oe has been converted to -e. Exim does not support all
2889 of the sendmail error options. */
2892 if (Ustrcmp(argrest, "e") == 0)
2894 arg_error_handling = ERRORS_SENDER;
2895 errors_sender_rc = EXIT_SUCCESS;
2897 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2898 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2899 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2900 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2905 /* -F: Set sender's full name, used instead of the gecos entry from
2906 the password file. Since users can usually alter their gecos entries,
2907 there's no security involved in using this instead. The data can follow
2908 the -F or be in the next argument. */
2912 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2913 originator_name = string_copy_taint(
2914 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2916 f.sender_name_forced = TRUE;
2920 /* -f: Set sender's address - this value is only actually used if Exim is
2921 run by a trusted user, or if untrusted_set_sender is set and matches the
2922 address, except that the null address can always be set by any user. The
2923 test for this happens later, when the value given here is ignored when not
2924 permitted. For an untrusted user, the actual sender is still put in Sender:
2925 if it doesn't match the From: header (unless no_local_from_check is set).
2926 The data can follow the -f or be in the next argument. The -r switch is an
2927 obsolete form of -f but since there appear to be programs out there that
2928 use anything that sendmail has ever supported, better accept it - the
2929 synonymizing is done before the switch above.
2931 At this stage, we must allow domain literal addresses, because we don't
2932 know what the setting of allow_domain_literals is yet. Ditto for trailing
2933 dots and strip_trailing_dot. */
2937 int dummy_start, dummy_end;
2940 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2941 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2944 uschar * s = store_get(1, GET_UNTAINTED); /* Ensure writeable memory */
2950 const uschar * temp = argrest + Ustrlen(argrest) - 1;
2951 while (temp >= argrest && isspace(*temp)) temp--;
2952 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2953 allow_domain_literals = TRUE;
2954 strip_trailing_dot = TRUE;
2956 allow_utf8_domains = TRUE;
2958 if (!(sender_address = parse_extract_address(argrest, &errmess,
2959 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2960 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2962 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2964 message_smtputf8 = string_is_utf8(sender_address);
2965 allow_utf8_domains = FALSE;
2967 allow_domain_literals = FALSE;
2968 strip_trailing_dot = FALSE;
2970 f.sender_address_forced = TRUE;
2974 /* -G: sendmail invocation to specify that it's a gateway submission and
2975 sendmail may complain about problems instead of fixing them.
2976 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2977 not at this time complain about problems. */
2983 /* -h: Set the hop count for an incoming message. Exim does not currently
2984 support this; it always computes it by counting the Received: headers.
2985 To put it in will require a change to the spool header file format. */
2989 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2990 if (!isdigit(*argrest)) badarg = TRUE;
2994 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2995 not to be documented for sendmail but mailx (at least) uses it) */
2998 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
3002 /* -L: set the identifier used for syslog; equivalent to setting
3003 syslog_processname in the config file, but needs to be an admin option. */
3007 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3008 if ((sz = Ustrlen(argrest)) > 32)
3009 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
3011 exim_fail("exim: the -L syslog name is too short\n");
3012 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
3016 receiving_message = FALSE;
3018 /* -MC: continue delivery of another message via an existing open
3019 file descriptor. This option is used for an internal call by the
3020 smtp transport when there is a pending message waiting to go to an
3021 address to which it has got a connection. Five subsequent arguments are
3022 required: transport name, host name, IP address, sequence number, and
3023 message_id. Transports may decline to create new processes if the sequence
3024 number gets too big. The channel is stdin. This (-MC) must be the last
3025 argument. There's a subsequent check that the real-uid is privileged.
3027 If we are running in the test harness. delay for a bit, to let the process
3028 that set this one up complete. This makes for repeatability of the logging,
3031 if (Ustrcmp(argrest, "C") == 0)
3033 union sockaddr_46 interface_sock;
3034 EXIM_SOCKLEN_T size = sizeof(interface_sock);
3037 exim_fail("exim: too many or too few arguments after -MC\n");
3039 if (msg_action_arg >= 0)
3040 exim_fail("exim: incompatible arguments\n");
3042 continue_transport = string_copy_taint(
3043 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
3045 continue_hostname = string_copy_taint(
3046 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
3048 continue_host_address = string_copy_taint(
3049 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
3051 continue_sequence = Uatoi(argv[++i]);
3052 msg_action = MSG_DELIVER;
3053 msg_action_arg = ++i;
3054 forced_delivery = TRUE;
3055 queue_run_pid = passed_qr_pid;
3056 queue_run_pipe = passed_qr_pipe;
3058 if (!mac_ismsgid(argv[i]))
3059 exim_fail("exim: malformed message id %s after -MC option\n",
3062 /* Set up $sending_ip_address and $sending_port, unless proxied */
3064 if (!continue_proxy_cipher)
3065 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
3067 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
3070 exim_fail("exim: getsockname() failed after -MC option: %s\n",
3073 testharness_pause_ms(500);
3077 else if (*argrest == 'C' && argrest[1] && !argrest[2])
3081 /* -MCA: set the smtp_authenticated flag; this is useful only when it
3082 precedes -MC (see above). The flag indicates that the host to which
3083 Exim is connected has accepted an AUTH sequence. */
3085 case 'A': f.smtp_authenticated = TRUE; break;
3087 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
3088 that exim is connected to supports the esmtp extension DSN */
3090 case 'D': smtp_peer_options |= OPTION_DSN; break;
3092 /* -MCd: for debug, set a process-purpose string */
3094 case 'd': if (++i < argc)
3095 process_purpose = string_copy_taint(
3096 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
3101 /* -MCG: set the queue name, to a non-default value. Arguably, anything
3102 from the commandline should be tainted - but we will need an untainted
3103 value for the spoolfile when doing a -odi delivery process. */
3105 case 'G': if (++i < argc) queue_name = string_copy_taint(
3106 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
3111 /* -MCK: the peer offered CHUNKING. Must precede -MC */
3113 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
3115 #ifndef DISABLE_ESMTP_LIMITS
3116 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
3117 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
3119 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
3121 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
3126 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
3127 it preceded -MC (see above) */
3129 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3131 #ifdef SUPPORT_SOCKS
3132 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3133 case 'p': proxy_session = TRUE;
3136 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3139 proxy_local_port = Uatoi(argv[i]);
3142 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3145 proxy_external_port = Uatoi(argv[i]);
3151 /* -MCQ: pass on the pid of the queue-running process that started
3152 this chain of deliveries and the fd of its synchronizing pipe; this
3153 is useful only when it precedes -MC (see above) */
3155 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3157 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3161 /* -MCq: do a quota check on the given recipient for the given size
3162 of message. Separate from -MC. */
3163 case 'q': rcpt_verify_quota = TRUE;
3164 if (++i < argc) message_size = Uatoi(argv[i]);
3168 /* -MCS: set the smtp_use_size flag; this is useful only when it
3169 precedes -MC (see above) */
3171 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3174 /* -MCs: used with -MCt; SNI was sent */
3175 /* -MCr: ditto, DANE */
3178 case 's': if (++i < argc)
3180 continue_proxy_sni = string_copy_taint(
3181 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3183 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3188 /* -MCt: similar to -MCT below but the connection is still open
3189 via a proxy process which handles the TLS context and coding.
3190 Require three arguments for the proxied local address and port,
3191 and the TLS cipher. */
3193 case 't': if (++i < argc)
3194 sending_ip_address = string_copy_taint(
3195 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3199 sending_port = (int)(Uatol(argv[i]));
3202 continue_proxy_cipher = string_copy_taint(
3203 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3208 /* -MCT: set the tls_offered flag; this is useful only when it
3209 precedes -MC (see above). The flag indicates that the host to which
3210 Exim is connected has offered TLS support. */
3212 case 'T': smtp_peer_options |= OPTION_TLS; break;
3215 default: badarg = TRUE; break;
3220 /* -M[x]: various operations on the following list of message ids:
3221 -M deliver the messages, ignoring next retry times and thawing
3222 -Mc deliver the messages, checking next retry times, no thawing
3223 -Mf freeze the messages
3224 -Mg give up on the messages
3225 -Mt thaw the messages
3226 -Mrm remove the messages
3227 In the above cases, this must be the last option. There are also the
3228 following options which are followed by a single message id, and which
3229 act on that message. Some of them use the "recipient" addresses as well.
3230 -Mar add recipient(s)
3231 -MG move to a different queue
3232 -Mmad mark all recipients delivered
3233 -Mmd mark recipients(s) delivered
3235 -Mset load a message for use with -be
3237 -Mvc show copy (of whole message, in RFC 2822 format)
3244 msg_action = MSG_DELIVER;
3245 forced_delivery = f.deliver_force_thaw = TRUE;
3247 else if (Ustrcmp(argrest, "ar") == 0)
3249 msg_action = MSG_ADD_RECIPIENT;
3250 one_msg_action = TRUE;
3252 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3253 else if (Ustrcmp(argrest, "es") == 0)
3255 msg_action = MSG_EDIT_SENDER;
3256 one_msg_action = TRUE;
3258 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3259 else if (Ustrcmp(argrest, "g") == 0)
3261 msg_action = MSG_DELIVER;
3262 deliver_give_up = TRUE;
3264 else if (Ustrcmp(argrest, "G") == 0)
3266 msg_action = MSG_SETQUEUE;
3267 queue_name_dest = string_copy_taint(
3268 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3269 EXIM_DRIVERNAME_MAX, "-MG"),
3272 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3273 else if (Ustrcmp(argrest, "md") == 0)
3275 msg_action = MSG_MARK_DELIVERED;
3276 one_msg_action = TRUE;
3278 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3279 else if (Ustrcmp(argrest, "set") == 0)
3281 msg_action = MSG_LOAD;
3282 one_msg_action = TRUE;
3284 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3285 else if (Ustrcmp(argrest, "vb") == 0)
3287 msg_action = MSG_SHOW_BODY;
3288 one_msg_action = TRUE;
3290 else if (Ustrcmp(argrest, "vc") == 0)
3292 msg_action = MSG_SHOW_COPY;
3293 one_msg_action = TRUE;
3295 else if (Ustrcmp(argrest, "vh") == 0)
3297 msg_action = MSG_SHOW_HEADER;
3298 one_msg_action = TRUE;
3300 else if (Ustrcmp(argrest, "vl") == 0)
3302 msg_action = MSG_SHOW_LOG;
3303 one_msg_action = TRUE;
3305 else { badarg = TRUE; break; }
3307 /* All the -Mxx options require at least one message id. */
3309 msg_action_arg = i + 1;
3310 if (msg_action_arg >= argc)
3311 exim_fail("exim: no message ids given after %s option\n", arg);
3313 /* Some require only message ids to follow */
3315 if (!one_msg_action)
3317 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3318 exim_fail("exim: malformed message id %s after %s option\n",
3320 goto END_ARG; /* Remaining args are ids */
3323 /* Others require only one message id, possibly followed by addresses,
3324 which will be handled as normal arguments. */
3328 if (!mac_ismsgid(argv[msg_action_arg]))
3329 exim_fail("exim: malformed message id %s after %s option\n",
3330 argv[msg_action_arg], arg);
3336 /* Some programs seem to call the -om option without the leading o;
3337 for sendmail it askes for "me too". Exim always does this. */
3340 if (*argrest) badarg = TRUE;
3344 /* -N: don't do delivery - a debugging option that stops transports doing
3345 their thing. It implies debugging at the D_v level. */
3350 f.dont_deliver = TRUE;
3351 debug_selector |= D_v;
3352 debug_file = stderr;
3358 /* -n: This means "don't alias" in sendmail, apparently.
3359 For normal invocations, it has no effect.
3360 It may affect some other options. */
3366 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3367 option to the specified value. This form uses long names. We need to handle
3368 -O option=value and -Ooption=value. */
3373 exim_fail("exim: string expected after -O\n");
3379 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3382 if (!*(alias_arg = argrest))
3383 if (i+1 < argc) alias_arg = argv[++i];
3384 else exim_fail("exim: string expected after -oA\n");
3387 /* -oB: Set a connection message max value for remote deliveries */
3390 const uschar * p = argrest;
3392 if (i+1 < argc && isdigit((argv[i+1][0])))
3396 connection_max_messages = 1;
3403 exim_fail("exim: number expected after -oB\n");
3404 connection_max_messages = Uatoi(p);
3409 /* -odb: background delivery */
3412 if (Ustrcmp(argrest, "b") == 0)
3414 f.synchronous_delivery = FALSE;
3415 arg_queue_only = FALSE;
3416 queue_only_set = TRUE;
3419 /* -odd: testsuite-only: add no inter-process delays */
3421 else if (Ustrcmp(argrest, "d") == 0)
3422 f.testsuite_delays = FALSE;
3424 /* -odf: foreground delivery (smail-compatible option); same effect as
3425 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3428 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3430 f.synchronous_delivery = TRUE;
3431 arg_queue_only = FALSE;
3432 queue_only_set = TRUE;
3435 /* -odq: queue only */
3437 else if (Ustrcmp(argrest, "q") == 0)
3439 f.synchronous_delivery = FALSE;
3440 arg_queue_only = TRUE;
3441 queue_only_set = TRUE;
3444 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3445 but no remote delivery */
3447 else if (Ustrcmp(argrest, "qs") == 0)
3449 f.queue_smtp = TRUE;
3450 arg_queue_only = FALSE;
3451 queue_only_set = TRUE;
3456 /* -oex: Sendmail error flags. As these are also accepted without the
3457 leading -o prefix, for compatibility with vacation and other callers,
3458 they are handled with -e above. */
3460 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3461 -oitrue: Another sendmail syntax for the same */
3464 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3469 /* -oM*: Set various characteristics for an incoming message; actually
3470 acted on for trusted callers only. */
3475 exim_fail("exim: data expected after -oM%s\n", argrest);
3477 /* -oMa: Set sender host address */
3479 if (Ustrcmp(argrest, "a") == 0)
3480 sender_host_address = string_copy_taint(
3481 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3482 EXIM_IPADDR_MAX, "-oMa"), GET_TAINTED);
3484 /* -oMaa: Set authenticator name */
3486 else if (Ustrcmp(argrest, "aa") == 0)
3487 sender_host_authenticated = string_copy_taint(
3488 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3489 EXIM_DRIVERNAME_MAX, "-oMaa"), GET_TAINTED);
3491 /* -oMas: setting authenticated sender */
3493 else if (Ustrcmp(argrest, "as") == 0)
3494 authenticated_sender = string_copy_taint(
3495 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3496 EXIM_EMAILADDR_MAX, "-oMas"), GET_TAINTED);
3498 /* -oMai: setting authenticated id */
3500 else if (Ustrcmp(argrest, "ai") == 0)
3501 authenticated_id = string_copy_taint(
3502 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3503 EXIM_EMAILADDR_MAX, "-oMai"), GET_TAINTED);
3505 /* -oMi: Set incoming interface address */
3507 else if (Ustrcmp(argrest, "i") == 0)
3508 interface_address = string_copy_taint(
3509 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3510 EXIM_IPADDR_MAX, "-oMi"), GET_TAINTED);
3512 /* -oMm: Message reference */
3514 else if (Ustrcmp(argrest, "m") == 0)
3516 if (!mac_ismsgid(argv[i+1]))
3517 exim_fail("-oMm must be a valid message ID\n");
3518 if (!f.trusted_config)
3519 exim_fail("-oMm must be called by a trusted user/config\n");
3520 message_reference = next_argv(argv, &i, argc, arg);
3523 /* -oMr: Received protocol */
3525 else if (Ustrcmp(argrest, "r") == 0)
3527 if (received_protocol)
3528 exim_fail("received_protocol is set already\n");
3530 if (++i >= argc) badarg = TRUE;
3532 received_protocol = string_copy_taint(
3533 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-oMr"),
3536 /* -oMs: Set sender host name */
3538 else if (Ustrcmp(argrest, "s") == 0)
3539 if (++i >= argc) badarg = TRUE;
3541 sender_host_name = string_copy_taint(
3542 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-oMs"),
3545 /* -oMt: Set sender ident */
3547 else if (Ustrcmp(argrest, "t") == 0)
3548 if (++i >= argc) badarg = TRUE;
3551 sender_ident_set = TRUE;
3552 sender_ident = string_copy_taint(
3553 exim_str_fail_toolong(argv[i], EXIM_IDENTUSER_MAX, "-oMt"),
3557 /* Else a bad argument */
3564 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3565 seem to call this as -m (undocumented), so that is also accepted (see
3567 /* -oo: An ancient flag for old-style addresses which still seems to
3568 crop up in some calls (see in SCO). */
3572 if (*argrest) badarg = TRUE;
3575 /* -oP <name>: set pid file path for daemon
3576 -oPX: delete pid file of daemon */
3579 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3580 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3581 "(uid=%d euid=%d | %d)\n",
3582 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3584 if (++i < argc) override_pid_file_path = argv[i];
3586 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3591 /* -or <n>: set timeout for non-SMTP acceptance
3592 -os <n>: set timeout for SMTP acceptance */
3597 int * tp = argrest[-1] == 'r'
3598 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3600 *tp = readconf_readtime(argrest, 0, FALSE);
3601 else if (i+1 < argc)
3602 *tp = readconf_readtime(argv[++i], 0, FALSE);
3605 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3609 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3610 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3613 if (*argrest || ++i >= argc) badarg = TRUE;
3614 else override_local_interfaces = string_copy_taint(
3615 exim_str_fail_toolong(argv[i], 1024, "-oX"), GET_TAINTED);
3618 /* -oY: Override creation of daemon notifier socket */
3621 if (*argrest) badarg = TRUE;
3622 else f.notifier_socket_en = FALSE;
3625 /* Unknown -o argument */
3633 /* -ps: force Perl startup; -pd force delayed Perl startup */
3637 if (*argrest == 's' && argrest[1] == 0)
3639 perl_start_option = 1;
3642 if (*argrest == 'd' && argrest[1] == 0)
3644 perl_start_option = -1;
3649 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3650 which sets the host protocol and host name */
3653 argrest = next_argv(argv, &i, argc, arg);
3657 uschar * hn = Ustrchr(argrest, ':');
3659 if (received_protocol)
3660 exim_fail("received_protocol is set already\n");
3663 received_protocol = string_copy_taint(
3664 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3668 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3669 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3670 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3675 /* -q: set up queue runs */
3679 BOOL two_stage, first_del, force, thaw = FALSE, local;
3681 receiving_message = FALSE;
3683 /* -qq...: Do queue runs in a 2-stage manner */
3685 if ((two_stage = *argrest == 'q'))
3688 /* -qi...: Do only first (initial) deliveries */
3690 if ((first_del = *argrest == 'i'))
3693 /* -qf...: Run the queue, forcing deliveries
3694 -qff..: Ditto, forcing thawing as well */
3696 if ((force = *argrest == 'f'))
3697 if ((thaw = *++argrest == 'f'))
3700 /* -q[f][f]l...: Run the queue only on local deliveries */
3702 if ((local = *argrest == 'l'))
3705 /* -q[f][f][l][G<name>]... Work on the named queue */
3707 if (*argrest == 'G')
3710 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3711 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3712 queue_name = string_copyn(argrest, i);
3714 if (*argrest == '/') argrest++;
3717 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3718 only, optionally named, optionally starting from a given message id. */
3720 if (!(list_queue || count_queue))
3725 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3727 q = alloc_onetime_qrunner();
3728 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3729 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3730 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3731 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3734 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3735 forced, optionally local only, optionally named. */
3742 if (*argrest) s = argrest;
3743 else if (++i < argc) { badarg = TRUE; break; }
3746 if ((intvl = readconf_readtime(s, 0, FALSE)) <= 0)
3747 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3749 for (qrunner * qq = qrunners; qq; qq = qq->next)
3750 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3751 || !queue_name && !qq->name)
3752 exim_fail("exim: queue-runner specified more than once\n");
3754 q = alloc_qrunner();
3755 q->interval = intvl;
3758 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3759 q->queue_run_force = force;
3760 q->deliver_force_thaw = thaw;
3761 q->queue_run_first_delivery = first_del;
3762 q->queue_run_local = local;
3763 q->queue_2stage = two_stage;
3770 case 'R': /* Synonymous with -qR... */
3771 case 'S': /* Synonymous with -qS... */
3773 const uschar * tainted_selectstr;
3776 receiving_message = FALSE;
3778 /* -Rf: As -R (below) but force all deliveries,
3779 -Rff: Ditto, but also thaw all frozen messages,
3780 -Rr: String is regex
3781 -Rrf: Regex and force
3782 -Rrff: Regex and force and thaw
3784 -S...: Like -R but works on sender.
3786 in all cases provided there are no further characters in this
3789 if (!qrunners) alloc_onetime_qrunner();
3790 qrunners->queue_2stage = f.queue_2stage;
3792 for (int i = 0; i < nelem(rsopts); i++)
3793 if (Ustrcmp(argrest, rsopts[i]) == 0)
3795 if (i != 2) qrunners->queue_run_force = TRUE;
3797 if (switchchar == 'R')
3798 f.deliver_selectstring_regex = TRUE;
3800 f.deliver_selectstring_sender_regex = TRUE;
3801 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3802 argrest += Ustrlen(rsopts[i]);
3805 /* -R or -S: Set string to match in addresses for forced queue run to
3806 pick out particular messages. */
3808 /* Avoid attacks from people providing very long strings, and do so before
3811 tainted_selectstr = argrest;
3812 else if (i+1 < argc)
3813 tainted_selectstr = argv[++i];
3815 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3817 s = string_copy_taint(
3818 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3821 if (switchchar == 'R')
3822 deliver_selectstring = s;
3824 deliver_selectstring_sender = s;
3829 /* -r: an obsolete synonym for -f (see above) */
3831 /* -Tqt is an option that is exclusively for use by the testing suite.
3832 It is not recognized in other circumstances. It allows for the setting up
3833 of explicit "queue times" so that various warning/retry things can be
3834 tested. Otherwise variability of clock ticks etc. cause problems. */
3837 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0 && ++i < argc)
3838 fudged_queue_times = string_copy_taint(argv[i], GET_TAINTED);
3843 /* -t: Set flag to extract recipients from body of message. */
3846 if (!*argrest) extract_recipients = TRUE;
3848 /* -ti: Set flag to extract recipients from body of message, and also
3849 specify that dot does not end the message. */
3851 else if (Ustrcmp(argrest, "i") == 0)
3853 extract_recipients = TRUE;
3857 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3860 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3867 /* -U: This means "initial user submission" in sendmail, apparently. The
3868 doc claims that in future sendmail may refuse syntactically invalid
3869 messages instead of fixing them. For the moment, we just ignore it. */
3875 /* -v: verify things - this is a very low-level debugging */
3880 debug_selector |= D_v;
3881 debug_file = stderr;
3887 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3889 The -x flag tells the sendmail command that mail from a local
3890 mail program has National Language Support (NLS) extended characters
3891 in the body of the mail item. The sendmail command can send mail with
3892 extended NLS characters across networks that normally corrupts these
3895 As Exim is 8-bit clean, it just ignores this flag. */
3898 if (*argrest) badarg = TRUE;
3901 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3902 logs to that file. We swallow the parameter and otherwise ignore it. */
3907 exim_fail("exim: string expected after -X\n");
3910 /* -z: a line of text to log */
3915 log_oneline = string_copy_taint(
3916 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3919 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3922 /* All other initial characters are errors */
3927 } /* End of high-level switch statement */
3929 /* Failed to recognize the option, or syntax error */
3932 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3933 "option %s\n", arg);
3937 /* If -R or -S have been specified without -q, assume a single queue run. */
3939 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3940 alloc_onetime_qrunner();
3944 store_pool = old_pool;
3947 /* If usage_wanted is set we call the usage function - which never returns */
3948 if (usage_wanted) exim_usage(called_as);
3950 /* Arguments have been processed. Check for incompatibilities. */
3951 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3952 && ( f.daemon_listen || qrunners || bi_option
3953 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3954 || filter_test != FTEST_NONE
3955 || msg_action_arg > 0 && !one_msg_action
3957 || ( msg_action_arg > 0
3958 && ( f.daemon_listen || is_multiple_qrun() || list_options
3959 || checking && msg_action != MSG_LOAD
3960 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3962 || ( (f.daemon_listen || is_multiple_qrun())
3963 && ( sender_address || list_options || list_queue || checking
3966 || f.daemon_listen && is_onetime_qrun()
3967 || f.inetd_wait_mode && qrunners
3969 && ( checking || smtp_input || extract_recipients
3970 || filter_test != FTEST_NONE || bi_option
3972 || ( verify_address_mode
3973 && ( f.address_test_mode || smtp_input || extract_recipients
3974 || filter_test != FTEST_NONE || bi_option
3976 || ( f.address_test_mode
3977 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3981 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3983 || deliver_selectstring && !qrunners
3984 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3986 exim_fail("exim: incompatible command-line options or arguments\n");
3988 /* If debugging is set up, set the file and the file descriptor to pass on to
3989 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3990 to run in the foreground. */
3992 if (debug_selector != 0)
3994 debug_file = stderr;
3995 debug_fd = fileno(debug_file);
3996 f.background_daemon = FALSE;
3997 testharness_pause_ms(100); /* lets caller finish */
3998 if (debug_selector != D_v) /* -v only doesn't show this */
4000 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
4001 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
4003 if (!version_printed)
4004 show_whats_supported(FALSE);
4008 /* When started with root privilege, ensure that the limits on the number of
4009 open files and the number of processes (where that is accessible) are
4010 sufficiently large, or are unset, in case Exim has been called from an
4011 environment where the limits are screwed down. Not all OS have the ability to
4012 change some of these limits. */
4016 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
4022 #ifdef RLIMIT_NOFILE
4023 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
4025 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
4027 rlp.rlim_cur = rlp.rlim_max = 0;
4030 /* I originally chose 1000 as a nice big number that was unlikely to
4031 be exceeded. It turns out that some older OS have a fixed upper limit of
4034 if (rlp.rlim_cur < 1000)
4036 rlp.rlim_cur = rlp.rlim_max = 1000;
4037 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4039 rlp.rlim_cur = rlp.rlim_max = 256;
4040 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4041 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
4048 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
4050 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
4052 rlp.rlim_cur = rlp.rlim_max = 0;
4055 # ifdef RLIM_INFINITY
4056 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
4058 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
4060 if (rlp.rlim_cur < 1000)
4062 rlp.rlim_cur = rlp.rlim_max = 1000;
4064 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
4065 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
4071 /* Exim is normally entered as root (but some special configurations are
4072 possible that don't do this). However, it always spins off sub-processes that
4073 set their uid and gid as required for local delivery. We don't want to pass on
4074 any extra groups that root may belong to, so we want to get rid of them all at
4077 We need to obey setgroups() at this stage, before possibly giving up root
4078 privilege for a changed configuration file, but later on we might need to
4079 check on the additional groups for the admin user privilege - can't do that
4080 till after reading the config, which might specify the exim gid. Therefore,
4081 save the group list here first. */
4083 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
4084 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
4086 /* There is a fundamental difference in some BSD systems in the matter of
4087 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
4088 known not to be different. On the "different" systems there is a single group
4089 list, and the first entry in it is the current group. On all other versions of
4090 Unix there is a supplementary group list, which is in *addition* to the current
4091 group. Consequently, to get rid of all extraneous groups on a "standard" system
4092 you pass over 0 groups to setgroups(), while on a "different" system you pass
4093 over a single group - the current group, which is always the first group in the
4094 list. Calling setgroups() with zero groups on a "different" system results in
4095 an error return. The following code should cope with both types of system.
4097 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
4098 the "setgroups() with zero groups" - and changes the egid.
4099 Thanks to that we had to stash the original_egid above, for use below
4100 in the call to exim_setugid().
4102 However, if this process isn't running as root, setgroups() can't be used
4103 since you have to be root to run it, even if throwing away groups.
4104 Except, sigh, for Hurd - where you can.
4105 Not being root here happens only in some unusual configurations. */
4108 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
4109 && setgroups(0, NULL) != 0
4111 && setgroups(1, group_list) != 0)
4112 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
4114 /* If the configuration file name has been altered by an argument on the
4115 command line (either a new file name or a macro definition) and the caller is
4116 not root, or if this is a filter testing run, remove any setuid privilege the
4117 program has and run as the underlying user.
4119 The exim user is locked out of this, which severely restricts the use of -C
4122 Otherwise, set the real ids to the effective values (should be root unless run
4123 from inetd, which it can either be root or the exim uid, if one is configured).
4125 There is a private mechanism for bypassing some of this, in order to make it
4126 possible to test lots of configurations automatically, without having either to
4127 recompile each time, or to patch in an actual configuration file name and other
4128 values (such as the path name). If running in the test harness, pretend that
4129 configuration file changes and macro definitions haven't happened. */
4132 (!f.trusted_config || /* Config changed, or */
4133 !macros_trusted(opt_D_used)) && /* impermissible macros and */
4134 real_uid != root_uid && /* Not root, and */
4135 !f.running_in_test_harness /* Not fudged */
4137 expansion_test /* expansion testing */
4139 filter_test != FTEST_NONE) /* Filter testing */
4141 setgroups(group_count, group_list);
4142 exim_setugid(real_uid, real_gid, FALSE,
4143 US"-C, -D, -be or -bf forces real uid");
4144 removed_privilege = TRUE;
4146 /* In the normal case when Exim is called like this, stderr is available
4147 and should be used for any logging information because attempts to write
4148 to the log will usually fail. To arrange this, we unset really_exim. However,
4149 if no stderr is available there is no point - we might as well have a go
4150 at the log (if it fails, syslog will be written).
4152 Note that if the invoker is Exim, the logs remain available. Messing with
4153 this causes unlogged successful deliveries. */
4155 if (log_stderr && real_uid != exim_uid)
4156 f.really_exim = FALSE;
4159 /* Privilege is to be retained for the moment. It may be dropped later,
4160 depending on the job that this Exim process has been asked to do. For now, set
4161 the real uid to the effective so that subsequent re-execs of Exim are done by a
4165 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4167 /* If testing a filter, open the file(s) now, before wasting time doing other
4168 setups and reading the message. */
4170 if (filter_test & FTEST_SYSTEM)
4171 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4172 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4175 if (filter_test & FTEST_USER)
4176 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4177 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4180 /* Initialise lookup_list
4181 If debugging, already called above via version reporting.
4182 In either case, we initialise the list of available lookups while running
4183 as root. All dynamically modules are loaded from a directory which is
4184 hard-coded into the binary and is code which, if not a module, would be
4185 part of Exim already. Ability to modify the content of the directory
4186 is equivalent to the ability to modify a setuid binary!
4188 This needs to happen before we read the main configuration. */
4191 /*XXX this excrescence could move to the testsuite standard config setup file */
4193 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4196 /* Read the main runtime configuration data; this gives up if there
4197 is a failure. It leaves the configuration file open so that the subsequent
4198 configuration data for delivery can be read if needed.
4200 NOTE: immediately after opening the configuration file we change the working
4201 directory to "/"! Later we change to $spool_directory. We do it there, because
4202 during readconf_main() some expansion takes place already. */
4204 /* Store the initial cwd before we change directories. Can be NULL if the
4205 dir has already been unlinked. */
4206 initial_cwd = os_getcwd(NULL, 0);
4207 if (!initial_cwd && errno)
4208 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4210 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4211 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4214 -be[m] expansion test -
4215 -b[fF] filter test new
4217 -bmalware malware_test_file new
4219 -brw rewrite test new
4221 -bv[s] address verify -
4223 -bP <option> (except -bP config, which sets list_config)
4225 If any of these options is set, we suppress warnings about configuration
4226 issues (currently about tls_advertise_hosts and keep_environment not being
4230 int old_pool = store_pool;
4231 #ifdef MEASURE_TIMING
4233 (void)gettimeofday(&t0, NULL);
4236 store_pool = POOL_CONFIG;
4237 readconf_main(checking || list_options);
4238 store_pool = old_pool;
4240 #ifdef MEASURE_TIMING
4241 report_time_since(&t0, US"readconf_main (delta)");
4245 /* Now in directory "/" */
4247 if (cleanup_environment() == FALSE)
4248 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4251 /* If an action on specific messages is requested, or if a daemon or queue
4252 runner is being started, we need to know if Exim was called by an admin user.
4253 This is the case if the real user is root or exim, or if the real group is
4254 exim, or if one of the supplementary groups is exim or a group listed in
4255 admin_groups. We don't fail all message actions immediately if not admin_user,
4256 since some actions can be performed by non-admin users. Instead, set admin_user
4257 for later interrogation. */
4259 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4260 f.admin_user = TRUE;
4262 for (int i = 0; i < group_count && !f.admin_user; i++)
4263 if (group_list[i] == exim_gid)
4264 f.admin_user = TRUE;
4265 else if (admin_groups)
4266 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4267 if (admin_groups[j] == group_list[i])
4268 f.admin_user = TRUE;
4270 /* Another group of privileged users are the trusted users. These are root,
4271 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4272 are permitted to specify sender_addresses with -f on the command line, and
4273 other message parameters as well. */
4275 if (real_uid == root_uid || real_uid == exim_uid)
4276 f.trusted_caller = TRUE;
4280 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4281 if (trusted_users[i] == real_uid)
4282 f.trusted_caller = TRUE;
4285 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4286 if (trusted_groups[i] == real_gid)
4287 f.trusted_caller = TRUE;
4288 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4289 if (trusted_groups[i] == group_list[j])
4290 f.trusted_caller = TRUE;
4293 /* At this point, we know if the user is privileged and some command-line
4294 options become possibly impermissible, depending upon the configuration file. */
4296 if (checking && commandline_checks_require_admin && !f.admin_user)
4297 exim_fail("exim: those command-line flags are set to require admin\n");
4299 /* Handle the decoding of logging options. */
4301 decode_bits(log_selector, log_selector_size, log_notall,
4302 log_selector_string, log_options, log_options_count, US"log", 0);
4306 debug_printf("configuration file is %s\n", config_main_filename);
4307 debug_printf("log selectors =");
4308 for (int i = 0; i < log_selector_size; i++)
4309 debug_printf(" %08x", log_selector[i]);
4313 /* If domain literals are not allowed, check the sender address that was
4314 supplied with -f. Ditto for a stripped trailing dot. */
4318 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4319 exim_fail("exim: bad -f address \"%s\": domain literals not "
4320 "allowed\n", sender_address);
4321 if (f_end_dot && !strip_trailing_dot)
4322 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4323 "(trailing dot not allowed)\n", sender_address);
4326 /* See if an admin user overrode our logging. */
4328 if (cmdline_syslog_name)
4331 syslog_processname = cmdline_syslog_name;
4332 log_file_path = string_copy(CUS"syslog");
4335 /* not a panic, non-privileged users should not be able to spam paniclog */
4337 "exim: you lack sufficient privilege to specify syslog process name\n");
4339 /* Paranoia check of maximum lengths of certain strings. There is a check
4340 on the length of the log file path in log.c, which will come into effect
4341 if there are any calls to write the log earlier than this. However, if we
4342 get this far but the string is very long, it is better to stop now than to
4343 carry on and (e.g.) receive a message and then have to collapse. The call to
4344 log_write() from here will cause the ultimate panic collapse if the complete
4345 file name exceeds the buffer length. */
4347 if (Ustrlen(log_file_path) > 200)
4348 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4349 "log_file_path is longer than 200 chars: aborting");
4351 if (Ustrlen(pid_file_path) > 200)
4352 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4353 "pid_file_path is longer than 200 chars: aborting");
4355 if (Ustrlen(spool_directory) > 200)
4356 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4357 "spool_directory is longer than 200 chars: aborting");
4359 /* Length check on the process name given to syslog for its TAG field,
4360 which is only permitted to be 32 characters or less. See RFC 3164. */
4362 if (Ustrlen(syslog_processname) > 32)
4363 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4364 "syslog_processname is longer than 32 chars: aborting");
4369 log_write(0, LOG_MAIN, "%s", log_oneline);
4370 return EXIT_SUCCESS;
4373 return EXIT_FAILURE;
4375 /* In some operating systems, the environment variable TMPDIR controls where
4376 temporary files are created; Exim doesn't use these (apart from when delivering
4377 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4378 If TMPDIR is found in the environment, reset it to the value defined in the
4379 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4380 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4381 EXIM_TMPDIR by the build scripts.
4385 if (environ) for (uschar ** p = USS environ; *p; p++)
4386 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4388 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4389 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4391 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4395 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4396 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4397 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4398 called by a user who has set the TZ variable. This then affects the timestamps
4399 in log files and in Received: headers, and any created Date: header lines. The
4400 required timezone is settable in the configuration file, so nothing can be done
4401 about this earlier - but hopefully nothing will normally be logged earlier than
4402 this. We have to make a new environment if TZ is wrong, but don't bother if
4403 timestamps_utc is set, because then all times are in UTC anyway. */
4405 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4406 f.timestamps_utc = TRUE;
4409 uschar *envtz = US getenv("TZ");
4411 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4412 : timezone_string != NULL
4415 uschar **p = USS environ;
4419 if (environ) while (*p++) count++;
4420 if (!envtz) count++;
4421 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4422 if (environ) for (p = USS environ; *p; p++)
4423 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4424 if (timezone_string)
4426 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4427 sprintf(CS *newp++, "TZ=%s", timezone_string);
4432 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4433 tod_stamp(tod_log));
4437 /* Handle the case when we have removed the setuid privilege because of -C or
4438 -D. This means that the caller of Exim was not root.
4440 There is a problem if we were running as the Exim user. The sysadmin may
4441 expect this case to retain privilege because "the binary was called by the
4442 Exim user", but it hasn't, because either the -D option set macros, or the
4443 -C option set a non-trusted configuration file. There are two possibilities:
4445 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4446 to do message deliveries. Thus, the fact that it is running as a
4447 non-privileged user is plausible, and might be wanted in some special
4448 configurations. However, really_exim will have been set false when
4449 privilege was dropped, to stop Exim trying to write to its normal log
4450 files. Therefore, re-enable normal log processing, assuming the sysadmin
4451 has set up the log directory correctly.
4453 (2) If deliver_drop_privilege is not set, the configuration won't work as
4454 apparently intended, and so we log a panic message. In order to retain
4455 root for -C or -D, the caller must either be root or be invoking a
4456 trusted configuration file (when deliver_drop_privilege is false). */
4458 if ( removed_privilege
4459 && (!f.trusted_config || opt_D_used)
4460 && real_uid == exim_uid)
4461 if (deliver_drop_privilege)
4462 f.really_exim = TRUE; /* let logging work normally */
4464 log_write(0, LOG_MAIN|LOG_PANIC,
4465 "exim user lost privilege for using %s option",
4466 f.trusted_config? "-D" : "-C");
4468 /* Start up Perl interpreter if Perl support is configured and there is a
4469 perl_startup option, and the configuration or the command line specifies
4470 initializing starting. Note that the global variables are actually called
4471 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4474 if (perl_start_option != 0)
4475 opt_perl_at_start = (perl_start_option > 0);
4476 if (opt_perl_at_start && opt_perl_startup != NULL)
4479 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4480 if ((errstr = init_perl(opt_perl_startup)))
4481 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4482 opt_perl_started = TRUE;
4484 #endif /* EXIM_PERL */
4486 /* Log the arguments of the call if the configuration file said so. This is
4487 a debugging feature for finding out what arguments certain MUAs actually use.
4488 Don't attempt it if logging is disabled, or if listing variables or if
4489 verifying/testing addresses or expansions. */
4491 if ( (debug_selector & D_any || LOGGING(arguments))
4492 && f.really_exim && !list_options && !checking)
4494 uschar *p = big_buffer;
4495 Ustrcpy(p, US"cwd= (failed)");
4502 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4503 p += Ustrlen(CCS p);
4506 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4508 for (int i = 0; i < argc; i++)
4510 int len = Ustrlen(argv[i]);
4511 const uschar *printing;
4513 if (p + len + 8 >= big_buffer + big_buffer_size)
4515 Ustrcpy(p, US" ...");
4516 log_write(0, LOG_MAIN, "%s", big_buffer);
4517 Ustrcpy(big_buffer, US"...");
4520 printing = string_printing(argv[i]);
4521 if (!*printing) quote = US"\"";
4524 const uschar *pp = printing;
4526 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4528 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4529 (p - big_buffer) - 4), printing, quote);
4532 if (LOGGING(arguments))
4533 log_write(0, LOG_MAIN, "%s", big_buffer);
4535 debug_printf("%s\n", big_buffer);
4538 /* Set the working directory to be the top-level spool directory. We don't rely
4539 on this in the code, which always uses fully qualified names, but it's useful
4540 for core dumps etc. Don't complain if it fails - the spool directory might not
4541 be generally accessible and calls with the -C option (and others) have lost
4542 privilege by now. Before the chdir, we try to ensure that the directory exists.
4545 if (Uchdir(spool_directory) != 0)
4547 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4548 (void) Uchdir(spool_directory);
4551 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4552 alias file. Exim doesn't have such a concept, but this call is screwed into
4553 Sun's YP makefiles. Handle this by calling a configured script, as the real
4554 user who called Exim. The -oA option can be used to pass an argument to the
4559 (void) fclose(config_file);
4560 if (bi_command && *bi_command)
4563 const uschar * argv[3];
4564 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4565 if (alias_arg) argv[i++] = alias_arg;
4568 setgroups(group_count, group_list);
4569 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4571 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4572 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4574 execv(CS argv[0], (char *const *)argv);
4575 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4579 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4584 /* We moved the admin/trusted check to be immediately after reading the
4585 configuration file. We leave these prints here to ensure that syslog setup,
4586 logfile setup, and so on has already happened. */
4588 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4589 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4591 /* Only an admin user may start the daemon or force a queue run in the default
4592 configuration, but the queue run restriction can be relaxed. Only an admin
4593 user may request that a message be returned to its sender forthwith. Only an
4594 admin user may specify a debug level greater than D_v (because it might show
4595 passwords, etc. in lookup queries). Only an admin user may request a queue
4596 count. Only an admin user can use the test interface to scan for email
4597 (because Exim will be in the spool dir and able to look at mails). */
4601 BOOL debugset = (debug_selector & ~D_v) != 0;
4602 if ( deliver_give_up || f.daemon_listen || malware_test_file
4603 || count_queue && queue_list_requires_admin
4604 || list_queue && queue_list_requires_admin
4605 || qrunners && prod_requires_admin
4606 || queue_name_dest && prod_requires_admin
4607 || debugset && !f.running_in_test_harness
4609 exim_fail("exim:%s permission denied; not admin\n",
4610 debugset ? " debugging" : "");
4613 /* If the real user is not root or the exim uid, the argument for passing
4614 in an open TCP/IP connection for another message is not permitted, nor is
4615 running with the -N option for any delivery action, unless this call to exim is
4616 one that supplied an input message, or we are using a patched exim for
4617 regression testing. */
4619 if ( real_uid != root_uid && real_uid != exim_uid
4620 && ( continue_hostname
4622 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4624 && !f.running_in_test_harness
4626 exim_fail("exim: Permission denied; not exim user or root\n");
4628 /* If the caller is not trusted, certain arguments are ignored when running for
4629 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4630 Note that authority for performing certain actions on messages is tested in the
4631 queue_action() function. */
4633 if (!f.trusted_caller && !checking)
4635 sender_host_name = sender_host_address = interface_address =
4636 sender_ident = received_protocol = NULL;
4637 sender_host_port = interface_port = 0;
4638 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4641 /* If a sender host address is set, extract the optional port number off the
4642 end of it and check its syntax. Do the same thing for the interface address.
4643 Exim exits if the syntax is bad. */
4647 if (sender_host_address)
4648 sender_host_port = check_port(sender_host_address);
4649 if (interface_address)
4650 interface_port = check_port(interface_address);
4653 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4656 if (f.trusted_caller)
4658 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4659 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4662 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4665 /* If an SMTP message is being received check to see if the standard input is a
4666 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4667 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4672 union sockaddr_46 inetd_sock;
4673 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4674 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4676 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4677 if (family == AF_INET || family == AF_INET6)
4679 union sockaddr_46 interface_sock;
4680 size = sizeof(interface_sock);
4682 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4683 interface_address = host_ntoa(-1, &interface_sock, NULL,
4686 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4688 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4691 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4692 NULL, &sender_host_port);
4693 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4694 "inetd is not supported when mua_wrapper is set");
4698 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4703 /* If the load average is going to be needed while receiving a message, get it
4704 now for those OS that require the first call to os_getloadavg() to be done as
4705 root. There will be further calls later for each message received. */
4707 #ifdef LOAD_AVG_NEEDS_ROOT
4708 if ( receiving_message
4709 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4710 load_average = OS_GETLOADAVG();
4713 /* The queue_only configuration option can be overridden by -odx on the command
4714 line, except that if queue_only_override is false, queue_only cannot be unset
4715 from the command line. */
4717 if (queue_only_set && (queue_only_override || arg_queue_only))
4718 queue_only = arg_queue_only;
4720 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4723 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4724 if (arg_smtp_receive_timeout >= 0)
4725 smtp_receive_timeout = arg_smtp_receive_timeout;
4727 /* If Exim was started with root privilege, unless we have already removed the
4728 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4729 except when starting the daemon or doing some kind of delivery or address
4730 testing (-bt). These are the only cases when root need to be retained. We run
4731 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4732 retained only for starting the daemon. We always do the initgroups() in this
4733 situation (controlled by the TRUE below), in order to be as close as possible
4734 to the state Exim usually runs in. */
4736 if ( !unprivileged /* originally had root AND */
4737 && !removed_privilege /* still got root AND */
4738 && !f.daemon_listen /* not starting the daemon */
4739 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4740 && ( /* AND EITHER */
4741 deliver_drop_privilege /* requested unprivileged */
4743 !qrunners /* not running the queue */
4744 && ( msg_action_arg < 0 /* and */
4745 || msg_action != MSG_DELIVER /* not delivering */
4747 && (!checking || !f.address_test_mode) /* not address checking */
4748 && !rcpt_verify_quota /* and not quota checking */
4750 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4752 /* When we are retaining a privileged uid, we still change to the exim gid. */
4757 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4758 rv = setgid(exim_gid);
4759 /* Impact of failure is that some stuff might end up with an incorrect group.
4760 We track this for failures from root, since any attempt to change privilege
4761 by root should succeed and failures should be examined. For non-root,
4762 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4763 no need to complain then. */
4765 if (!(unprivileged || removed_privilege))
4766 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4769 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4770 (long int)exim_gid, strerror(errno));
4774 /* Handle a request to scan a file for malware */
4775 if (malware_test_file)
4777 #ifdef WITH_CONTENT_SCAN
4779 set_process_info("scanning file for malware");
4780 if ((result = malware_in_file(malware_test_file)) == FAIL)
4782 printf("No malware found.\n");
4783 exim_exit(EXIT_SUCCESS);
4787 printf("Malware lookup returned non-okay/fail: %d\n", result);
4788 exim_exit(EXIT_FAILURE);
4791 printf("Malware found: %s\n", malware_name);
4793 printf("Malware scan detected malware of unknown name.\n");
4795 printf("Malware scanning not enabled at compile time.\n");
4797 exim_exit(EXIT_FAILURE);
4800 /* Handle a request to list the delivery queue */
4804 set_process_info("listing the queue");
4805 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4806 exim_exit(EXIT_SUCCESS);
4809 /* Handle a request to count the delivery queue */
4813 set_process_info("counting the queue");
4814 fprintf(stdout, "%u\n", queue_count());
4815 exim_exit(EXIT_SUCCESS);
4818 /* Handle actions on specific messages, except for the force delivery and
4819 message load actions, which are done below. Some actions take a whole list of
4820 message ids, which are known to continue up to the end of the arguments. Others
4821 take a single message id and then operate on the recipients list. */
4823 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4825 int yield = EXIT_SUCCESS;
4826 set_process_info("acting on specified messages");
4828 /* ACL definitions may be needed when removing a message (-Mrm) because
4829 event_action gets expanded */
4831 if (msg_action == MSG_REMOVE)
4833 int old_pool = store_pool;
4834 store_pool = POOL_CONFIG;
4836 store_pool = old_pool;
4837 store_writeprotect(POOL_CONFIG);
4840 if (!one_msg_action)
4842 for (i = msg_action_arg; i < argc; i++)
4843 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4844 yield = EXIT_FAILURE;
4847 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4848 default: printf("\n"); break;
4852 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4853 recipients_arg)) yield = EXIT_FAILURE;
4857 /* We used to set up here to skip reading the ACL section, on
4858 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4859 Now, since the intro of the ${acl } expansion, ACL definitions may be
4860 needed in transports so we lost the optimisation. */
4863 int old_pool = store_pool;
4864 #ifdef MEASURE_TIMING
4866 (void)gettimeofday(&t0, NULL);
4869 store_pool = POOL_CONFIG;
4871 store_pool = old_pool;
4873 /* -be can add macro definitions, needing to link to the macro structure
4874 chain. Otherwise, make the memory used for config data readonly. */
4876 if (!expansion_test)
4877 store_writeprotect(POOL_CONFIG);
4879 #ifdef MEASURE_TIMING
4880 report_time_since(&t0, US"readconf_rest (delta)");
4884 /* Handle a request to check quota */
4885 if (rcpt_verify_quota)
4886 if (real_uid != root_uid && real_uid != exim_uid)
4887 exim_fail("exim: Permission denied\n");
4888 else if (recipients_arg >= argc)
4889 exim_fail("exim: missing recipient for quota check\n");
4892 verify_quota(US argv[recipients_arg]); /*XXX we lose track of const here */
4893 exim_exit(EXIT_SUCCESS);
4896 /* Handle the -brt option. This is for checking out retry configurations.
4897 The next three arguments are a domain name or a complete address, and
4898 optionally two error numbers. All it does is to call the function that
4899 scans the retry configuration data. */
4901 if (test_retry_arg >= 0)
4903 retry_config *yield;
4904 int basic_errno = 0;
4906 const uschar *s1, *s2;
4908 if (test_retry_arg >= argc)
4910 printf("-brt needs a domain or address argument\n");
4911 exim_exit(EXIT_FAILURE);
4913 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4916 /* If the first argument contains no @ and no . it might be a local user
4917 or it might be a single-component name. Treat as a domain. */
4919 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4921 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4922 "being \ntreated as a one-component domain, not as a local part.\n\n",
4926 /* There may be an optional second domain arg. */
4928 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4929 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4931 /* The final arg is an error name */
4933 if (test_retry_arg < argc)
4935 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4937 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4940 printf("%s\n", CS error);
4941 return EXIT_FAILURE;
4944 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4945 code > 100 as an error is for matching codes to the decade. Turn them into
4946 a real error code, off the decade. */
4948 if (basic_errno == ERRNO_MAIL4XX ||
4949 basic_errno == ERRNO_RCPT4XX ||
4950 basic_errno == ERRNO_DATA4XX)
4952 int code = (more_errno >> 8) & 255;
4954 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4955 else if (code > 100)
4956 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4960 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4961 printf("No retry information found\n");
4964 more_errno = yield->more_errno;
4965 printf("Retry rule: %s ", yield->pattern);
4967 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4969 printf("quota%s%s ",
4970 (more_errno > 0)? "_" : "",
4971 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4973 else if (yield->basic_errno == ECONNREFUSED)
4975 printf("refused%s%s ",
4976 (more_errno > 0)? "_" : "",
4977 (more_errno == 'M')? "MX" :
4978 (more_errno == 'A')? "A" : "");
4980 else if (yield->basic_errno == ETIMEDOUT)
4983 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4985 if (more_errno != 0) printf("_%s",
4986 (more_errno == 'M')? "MX" : "A");
4989 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4990 printf("auth_failed ");
4993 for (retry_rule * r = yield->rules; r; r = r->next)
4995 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4996 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
5002 printf(",%d.", x/1000);
5016 exim_exit(EXIT_SUCCESS);
5019 /* Handle a request to list one or more configuration options */
5020 /* If -n was set, we suppress some information */
5025 set_process_info("listing variables");
5026 if (recipients_arg >= argc)
5027 fail = !readconf_print(US"all", NULL, flag_n);
5028 else for (i = recipients_arg; i < argc; i++)
5031 (Ustrcmp(argv[i], "router") == 0 ||
5032 Ustrcmp(argv[i], "transport") == 0 ||
5033 Ustrcmp(argv[i], "authenticator") == 0 ||
5034 Ustrcmp(argv[i], "macro") == 0 ||
5035 Ustrcmp(argv[i], "environment") == 0))
5037 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
5041 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
5043 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
5048 set_process_info("listing config");
5049 exim_exit(readconf_print(US"config", NULL, flag_n)
5050 ? EXIT_SUCCESS : EXIT_FAILURE);
5054 /* Initialise subsystems as required. */
5058 /* Handle a request to deliver one or more messages that are already on the
5059 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
5060 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
5062 Delivery of specific messages is typically used for a small number when
5063 prodding by hand (when the option forced_delivery will be set) or when
5064 re-execing to regain root privilege. Each message delivery must happen in a
5065 separate process, so we fork a process for each one, and run them sequentially
5066 so that debugging output doesn't get intertwined, and to avoid spawning too
5067 many processes if a long list is given. However, don't fork for the last one;
5068 this saves a process in the common case when Exim is called to deliver just one
5071 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
5073 if (prod_requires_admin && !f.admin_user)
5075 fprintf(stderr, "exim: Permission denied\n");
5076 exim_exit(EXIT_FAILURE);
5078 set_process_info("delivering specified messages");
5079 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
5080 for (i = msg_action_arg; i < argc; i++)
5084 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
5085 that runs into a later copy into the untainted global message_id[] */
5086 /*XXX Do we need a length limit check here? */
5088 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5089 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
5091 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5092 exim_underbar_exit(EXIT_SUCCESS);
5096 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
5098 exim_exit(EXIT_FAILURE);
5102 exim_exit(EXIT_SUCCESS);
5106 /* If only a single queue run is requested, without SMTP listening, we can just
5107 turn into a queue runner, with an optional starting message id. */
5109 if (is_onetime_qrun() && !f.daemon_listen)
5111 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
5112 exim_exit(EXIT_SUCCESS);
5116 /* Find the login name of the real user running this process. This is always
5117 needed when receiving a message, because it is written into the spool file. It
5118 may also be used to construct a from: or a sender: header, and in this case we
5119 need the user's full name as well, so save a copy of it, checked for RFC822
5120 syntax and munged if necessary, if it hasn't previously been set by the -F
5121 argument. We may try to get the passwd entry more than once, in case NIS or
5122 other delays are in evidence. Save the home directory for use in filter testing
5127 if ((pw = getpwuid(real_uid)) != NULL)
5129 originator_login = string_copy(US pw->pw_name);
5130 originator_home = string_copy(US pw->pw_dir);
5132 /* If user name has not been set by -F, set it from the passwd entry
5133 unless -f has been used to set the sender address by a trusted user. */
5135 if (!originator_name)
5137 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5139 uschar *name = US pw->pw_gecos;
5140 uschar *amp = Ustrchr(name, '&');
5143 /* Most Unix specify that a '&' character in the gecos field is
5144 replaced by a copy of the login name, and some even specify that
5145 the first character should be upper cased, so that's what we do. */
5150 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5151 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5152 buffer[loffset] = toupper(buffer[loffset]);
5156 /* If a pattern for matching the gecos field was supplied, apply
5157 it and then expand the name string. */
5159 GET_OPTION("gecos_pattern");
5160 GET_OPTION("gecos_name");
5161 if (gecos_pattern && gecos_name)
5163 const pcre2_code *re;
5164 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5166 if (regex_match_and_setup(re, name, 0, -1))
5168 uschar *new_name = expand_string(gecos_name);
5172 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5173 "gecos field \"%s\"\n", new_name, name);
5176 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5177 "\"%s\": %s\n", gecos_name, expand_string_message);
5179 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5180 "gecos field \"%s\"\n", gecos_pattern, name);
5181 store_free((void *)re);
5183 originator_name = string_copy(name);
5186 /* A trusted caller has used -f but not -F */
5188 else originator_name = US"";
5191 /* Break the retry loop */
5196 if (++i > finduser_retries) break;
5200 /* If we cannot get a user login, log the incident and give up, unless the
5201 configuration specifies something to use. When running in the test harness,
5202 any setting of unknown_login overrides the actual name. */
5204 if (!originator_login || f.running_in_test_harness)
5206 GET_OPTION("unknown_login");
5209 originator_login = expand_string(unknown_login);
5210 if (!originator_name && unknown_username)
5211 originator_name = expand_string(unknown_username);
5212 if (!originator_name) originator_name = US"";
5214 if (!originator_login)
5215 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5219 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5222 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5224 /* If a message is created by this call of Exim, the uid/gid of its originator
5225 are those of the caller. These values are overridden if an existing message is
5226 read in from the spool. */
5228 originator_uid = real_uid;
5229 originator_gid = real_gid;
5231 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5232 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5234 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5235 returns. We leave this till here so that the originator_ fields are available
5236 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5239 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5243 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5244 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5245 "mua_wrapper is set");
5248 # ifndef DISABLE_TLS
5249 /* This also checks that the library linkage is working and we can call
5250 routines in it, so call even if tls_require_ciphers is unset */
5252 # ifdef MEASURE_TIMING
5254 (void)gettimeofday(&t0, NULL);
5256 if (!tls_dropprivs_validate_require_cipher(FALSE))
5257 exim_exit(EXIT_FAILURE);
5258 # ifdef MEASURE_TIMING
5259 report_time_since(&t0, US"validate_ciphers (delta)");
5267 /* If the sender ident has not been set (by a trusted caller) set it to
5268 the caller. This will get overwritten below for an inetd call. If a trusted
5269 caller has set it empty, unset it. */
5271 if (!sender_ident) sender_ident = originator_login;
5272 else if (!*sender_ident) sender_ident = NULL;
5274 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5275 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5276 originator_* variables set. */
5278 if (test_rewrite_arg >= 0)
5280 f.really_exim = FALSE;
5281 if (test_rewrite_arg >= argc)
5283 printf("-brw needs an address argument\n");
5284 exim_exit(EXIT_FAILURE);
5286 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5287 exim_exit(EXIT_SUCCESS);
5290 /* A locally-supplied message is considered to be coming from a local user
5291 unless a trusted caller supplies a sender address with -f, or is passing in the
5292 message via SMTP (inetd invocation or otherwise). */
5294 if ( !sender_address && !smtp_input
5295 || !f.trusted_caller && filter_test == FTEST_NONE)
5297 f.sender_local = TRUE;
5299 /* A trusted caller can supply authenticated_sender and authenticated_id
5300 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5301 defaults except when host checking. */
5303 if (!authenticated_sender && !host_checking)
5304 authenticated_sender = string_sprintf("%s@%s", originator_login,
5305 qualify_domain_sender);
5306 if (!authenticated_id && !host_checking)
5307 authenticated_id = originator_login;
5310 /* Trusted callers are always permitted to specify the sender address.
5311 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5312 is specified is the empty address. However, if a trusted caller does not
5313 specify a sender address for SMTP input, we leave sender_address unset. This
5314 causes the MAIL commands to be honoured. */
5316 if ( !smtp_input && !sender_address
5317 || !receive_check_set_sender(sender_address))
5319 /* Either the caller is not permitted to set a general sender, or this is
5320 non-SMTP input and the trusted caller has not set a sender. If there is no
5321 sender, or if a sender other than <> is set, override with the originator's
5322 login (which will get qualified below), except when checking things. */
5324 if ( !sender_address /* No sender_address set */
5326 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5327 !checking)) /* Not running tests, including filter tests */
5329 sender_address = originator_login;
5330 f.sender_address_forced = FALSE;
5331 sender_address_domain = 0;
5335 /* Remember whether an untrusted caller set the sender address */
5337 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5339 /* Ensure that the sender address is fully qualified unless it is the empty
5340 address, which indicates an error message, or doesn't exist (root caller, smtp
5341 interface, no -f argument). */
5343 if (sender_address && *sender_address && sender_address_domain == 0)
5344 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5345 qualify_domain_sender);
5347 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5349 /* Handle a request to verify a list of addresses, or test them for delivery.
5350 This must follow the setting of the sender address, since routers can be
5351 predicated upon the sender. If no arguments are given, read addresses from
5352 stdin. Set debug_level to at least D_v to get full output for address testing.
5355 if (verify_address_mode || f.address_test_mode)
5358 int flags = vopt_qualify;
5360 if (verify_address_mode)
5362 if (!verify_as_sender) flags |= vopt_is_recipient;
5363 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5368 flags |= vopt_is_recipient;
5369 debug_selector |= D_v;
5370 debug_file = stderr;
5371 debug_fd = fileno(debug_file);
5372 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5375 if (recipients_arg < argc)
5376 while (recipients_arg < argc)
5378 /* Supplied addresses are tainted since they come from a user */
5379 uschar * s = string_copy_taint(
5380 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5384 BOOL finished = FALSE;
5385 uschar *ss = parse_find_address_end(s, FALSE);
5386 if (*ss == ',') *ss = 0; else finished = TRUE;
5387 test_address(s, flags, &exit_value);
5390 while (*++s == ',' || isspace(*s)) ;
5396 uschar * s = get_stdinput(NULL, NULL);
5398 test_address(string_copy_taint(
5399 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5401 flags, &exit_value);
5405 exim_exit(exit_value);
5408 /* Handle expansion checking. Either expand items on the command line, or read
5409 from stdin if there aren't any. If -Mset was specified, load the message so
5410 that its variables can be used, but restrict this facility to admin users.
5411 Otherwise, if -bem was used, read a message from stdin. */
5415 dns_init(FALSE, FALSE, FALSE);
5416 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5420 exim_fail("exim: permission denied\n");
5421 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5422 /* Checking the length of the ID is sufficient to validate it.
5423 Get an untainted version so file opens can be done. */
5424 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5426 spoolname = string_sprintf("%s-H", message_id);
5427 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5428 printf ("Failed to load message datafile %s\n", message_id);
5429 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5430 printf ("Failed to load message %s\n", message_id);
5433 /* Read a test message from a file. We fudge it up to be on stdin, saving
5434 stdin itself for later reading of expansion strings. */
5436 else if (expansion_test_message)
5438 uschar * rme = expand_string(recipients_max);
5439 int save_stdin = dup(0);
5440 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5442 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5445 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5446 message_ended = END_NOTENDED;
5447 recipients_max_expanded = atoi(CCS rme);
5448 read_message_body(receive_msg(extract_recipients));
5449 message_linecount += body_linecount;
5450 (void)dup2(save_stdin, 0);
5451 (void)close(save_stdin);
5452 clearerr(stdin); /* Required by Darwin */
5455 /* Only admin users may see config-file macros this way */
5457 if (!f.admin_user) macros_user = macros = mlast = NULL;
5459 /* Allow $recipients for this testing */
5461 f.enable_dollar_recipients = TRUE;
5463 /* Expand command line items */
5465 if (recipients_arg < argc)
5466 while (recipients_arg < argc)
5467 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5473 char *(*fn_readline)(const char *) = NULL;
5474 void (*fn_addhist)(const char *) = NULL;
5478 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5481 while (s = get_stdinput(fn_readline, fn_addhist))
5482 expansion_test_line(s);
5485 if (dlhandle) dlclose(dlhandle);
5489 /* The data file will be open after -Mset */
5491 if (deliver_datafile >= 0)
5493 (void)close(deliver_datafile);
5494 deliver_datafile = -1;
5497 exim_exit(EXIT_SUCCESS);
5501 /* The active host name is normally the primary host name, but it can be varied
5502 for hosts that want to play several parts at once. We need to ensure that it is
5503 set for host checking, and for receiving messages. */
5505 smtp_active_hostname = primary_hostname;
5506 GET_OPTION("smtp_active_hostname");
5507 if (raw_active_hostname)
5509 uschar * nah = expand_string(raw_active_hostname);
5512 if (!f.expand_string_forcedfail)
5513 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5514 "(smtp_active_hostname): %s", raw_active_hostname,
5515 expand_string_message);
5517 else if (nah[0]) smtp_active_hostname = nah;
5520 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5521 given IP address so that the blocking and relay configuration can be tested.
5522 Unless a sender_ident was set by -oMt, we discard it (the default is the
5523 caller's login name). An RFC 1413 call is made only if we are running in the
5524 test harness and an incoming interface and both ports are specified, because
5525 there is no TCP/IP call to find the ident for. */
5532 if (!sender_ident_set)
5534 sender_ident = NULL;
5535 if (f.running_in_test_harness && sender_host_port
5536 && interface_address && interface_port)
5537 verify_get_ident(1223); /* note hardwired port number */
5540 /* In case the given address is a non-canonical IPv6 address, canonicalize
5541 it. Use the compressed form for IPv6. */
5543 size = host_aton(sender_host_address, x);
5544 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5546 (void) host_nmtoa(size, x, -1, sender_host_address, ':');
5548 (void) ipv6_nmtoa(x, sender_host_address);
5550 /* Now set up for testing */
5552 host_build_sender_fullhost();
5556 f.sender_local = FALSE;
5557 f.sender_host_notsocket = TRUE;
5558 debug_file = stderr;
5559 debug_fd = fileno(debug_file);
5560 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5561 "**** but without any ident (RFC 1413) callback.\n"
5562 "**** This is not for real!\n\n",
5563 sender_host_address);
5565 set_connection_id();
5566 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5567 if (verify_check_host(&hosts_connection_nolog) == OK)
5569 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5570 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5572 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5574 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5575 because a log line has already been written for all its failure exists
5576 (usually "connection refused: <reason>") and writing another one is
5577 unnecessary clutter. */
5579 if (smtp_start_session())
5582 for (; (reset_point = store_mark()); store_reset(reset_point))
5584 if (smtp_setup_msg() <= 0) break;
5585 if (!receive_msg(FALSE)) break;
5587 return_path = sender_address = NULL;
5588 dnslist_domain = dnslist_matched = NULL;
5589 #ifndef DISABLE_DKIM
5590 dkim_cur_signer = NULL;
5593 deliver_localpart_orig = NULL;
5594 deliver_domain_orig = NULL;
5595 callout_address = sending_ip_address = NULL;
5596 deliver_localpart_data = deliver_domain_data =
5597 recipient_data = sender_data = NULL;
5598 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5602 exim_exit(EXIT_SUCCESS);
5606 /* Arrange for message reception if recipients or SMTP were specified;
5607 otherwise complain unless a version print (-bV) happened or this is a filter
5608 verification test or info dump.
5609 In the former case, show the configuration file name. */
5611 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5613 if (version_printed)
5615 if (Ustrchr(config_main_filelist, ':'))
5616 printf("Configuration file search path is %s\n", config_main_filelist);
5617 printf("Configuration file is %s\n", config_main_filename);
5618 return EXIT_SUCCESS;
5621 if (info_flag != CMDINFO_NONE)
5623 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5624 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5627 if (filter_test == FTEST_NONE)
5628 exim_usage(called_as);
5632 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5633 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5634 that we are not called from inetd, because that is rejected above. The
5635 following configuration settings are forced here:
5637 (1) Synchronous delivery (-odi)
5638 (2) Errors to stderr (-oep == -oeq)
5639 (3) No parallel remote delivery
5640 (4) Unprivileged delivery
5642 We don't force overall queueing options because there are several of them;
5643 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5644 to override any SMTP queueing. */
5648 f.synchronous_delivery = TRUE;
5649 arg_error_handling = ERRORS_STDERR;
5650 remote_max_parallel = 1;
5651 deliver_drop_privilege = TRUE;
5652 f.queue_smtp = FALSE;
5653 queue_smtp_domains = NULL;
5655 message_utf8_downconvert = -1; /* convert-if-needed */
5660 /* Prepare to accept one or more new messages on the standard input. When a
5661 message has been read, its id is returned in message_id[]. If doing immediate
5662 delivery, we fork a delivery process for each received message, except for the
5663 last one, where we can save a process switch.
5665 It is only in non-smtp mode that error_handling is allowed to be changed from
5666 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5667 sendmail error modes other than -oem ever actually used? Later: yes.) */
5669 if (!smtp_input) error_handling = arg_error_handling;
5671 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5672 logging being sent down the socket and make an identd call to get the
5675 else if (f.is_inetd)
5677 (void)fclose(stderr);
5678 exim_nullstd(); /* Re-open to /dev/null */
5679 verify_get_ident(IDENT_PORT);
5680 host_build_sender_fullhost();
5681 set_process_info("handling incoming connection from %s via inetd",
5685 /* If the sender host address has been set, build sender_fullhost if it hasn't
5686 already been done (which it will have been for inetd). This caters for the
5687 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5688 so that the test for IP options is skipped for -bs input. */
5690 if (sender_host_address && !sender_fullhost)
5692 host_build_sender_fullhost();
5693 set_process_info("handling incoming connection from %s via -oMa",
5695 f.sender_host_notsocket = TRUE;
5698 /* Otherwise, set the sender host as unknown except for inetd calls. This
5699 prevents host checking in the case of -bs not from inetd and also for -bS. */
5701 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5703 /* If stdout does not exist, then dup stdin to stdout. This can happen
5704 if exim is started from inetd. In this case fd 0 will be set to the socket,
5705 but fd 1 will not be set. This also happens for passed SMTP channels. */
5707 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5709 /* Set up the incoming protocol name and the state of the program. Root is
5710 allowed to force received protocol via the -oMr option above. If we have come
5711 via inetd, the process info has already been set up. We don't set
5712 received_protocol here for smtp input, as it varies according to
5713 batch/HELO/EHLO/AUTH/TLS. */
5717 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5718 smtp_batched_input? "batched " : "",
5719 sender_address ? sender_address : originator_login);
5723 int old_pool = store_pool;
5724 store_pool = POOL_PERM;
5725 if (!received_protocol)
5726 received_protocol = string_sprintf("local%s", called_as);
5727 store_pool = old_pool;
5728 set_process_info("accepting a local non-SMTP message from <%s>",
5732 /* Initialize the session_local_queue-only flag (this will be ignored if
5733 mua_wrapper is set) */
5736 session_local_queue_only = queue_only;
5738 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5739 the spool if so configured. On failure, we must not attempt to send an error
5740 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5741 error code is given.) */
5743 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5744 exim_fail("exim: insufficient disk space\n");
5746 /* If this is smtp input of any kind, real or batched, handle the start of the
5749 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5750 because a log line has already been written for all its failure exists
5751 (usually "connection refused: <reason>") and writing another one is
5752 unnecessary clutter. */
5754 set_connection_id();
5759 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5760 if (verify_check_host(&hosts_connection_nolog) == OK)
5762 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5763 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5765 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5766 if (!smtp_start_session())
5769 exim_exit(EXIT_SUCCESS);
5773 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5774 (we handle buferring so as to have visibility of fill level). */
5778 GET_OPTION("message_size_limit");
5779 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5780 if (expand_string_message)
5781 if (thismessage_size_limit == -1)
5782 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5783 "message_size_limit: %s", expand_string_message);
5785 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5786 "message_size_limit: %s", expand_string_message);
5788 setvbuf(stdin, NULL, _IONBF, 0);
5791 /* Loop for several messages when reading SMTP input. If we fork any child
5792 processes, we don't want to wait for them unless synchronous delivery is
5793 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5794 same as SIG_DFL, despite the fact that documentation often lists the default as
5795 "ignore". This is a confusing area. This is what I know:
5797 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5798 processes that complete simply to go away without ever becoming defunct. You
5799 can't then wait for them - but we don't want to wait for them in the
5800 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5801 happen for all OS (e.g. *BSD is different).
5803 But that's not the end of the story. Some (many? all?) systems have the
5804 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5805 has by default, so it seems that the difference is merely one of default
5806 (compare restarting vs non-restarting signals).
5808 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5809 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5810 of the loop below. Paranoia rules.
5812 February 2003: That's *still* not the end of the story. There are now versions
5813 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5814 process then calls waitpid(), a grumble is written to the system log, because
5815 this is logically inconsistent. In other words, it doesn't like the paranoia.
5816 As a consequence of this, the waitpid() below is now excluded if we are sure
5817 that SIG_IGN works. */
5819 if (!f.synchronous_delivery)
5822 struct sigaction act;
5823 act.sa_handler = SIG_IGN;
5824 sigemptyset(&(act.sa_mask));
5825 act.sa_flags = SA_NOCLDWAIT;
5826 sigaction(SIGCHLD, &act, NULL);
5828 signal(SIGCHLD, SIG_IGN);
5832 /* Save the current store pool point, for resetting at the start of
5833 each message, and save the real sender address, if any. */
5835 real_sender_address = sender_address;
5837 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5838 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5841 for (BOOL more = TRUE; more; )
5843 rmark reset_point = store_mark();
5846 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5847 input and build the recipients list, before calling receive_msg() to read the
5848 message proper. Whatever sender address is given in the SMTP transaction is
5849 often ignored for local senders - we use the actual sender, which is normally
5850 either the underlying user running this process or a -f argument provided by
5851 a trusted caller. It is saved in real_sender_address. The test for whether to
5852 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5857 if ((rc = smtp_setup_msg()) > 0)
5859 if ( real_sender_address
5860 && !receive_check_set_sender(sender_address))
5862 sender_address = raw_sender = real_sender_address;
5863 sender_address_unrewritten = NULL;
5866 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5867 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5868 the very end. The result of the ACL is ignored (as for other non-SMTP
5869 messages). It is run for its potential side effects. */
5871 if (smtp_batched_input)
5873 GET_OPTION("acl_not_smtp_start");
5874 if (acl_not_smtp_start)
5876 uschar * user_msg, * log_msg;
5877 f.enable_dollar_recipients = TRUE;
5878 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5879 &user_msg, &log_msg);
5880 f.enable_dollar_recipients = FALSE;
5884 /* Now get the data for the message */
5886 more = receive_msg(extract_recipients);
5889 cancel_cutthrough_connection(TRUE, US"receive dropped");
5890 if (more) goto MORELOOP;
5891 smtp_log_no_mail(); /* Log no mail if configured */
5892 exim_exit(EXIT_FAILURE);
5897 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5898 smtp_log_no_mail(); /* Log no mail if configured */
5899 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5903 /* In the non-SMTP case, we have all the information from the command
5904 line, but must process it in case it is in the more general RFC822
5905 format, and in any case, to detect syntax errors. Also, it appears that
5906 the use of comma-separated lists as single arguments is common, so we
5907 had better support them. */
5911 uschar * rme = expand_string(recipients_max);
5912 int rcount = 0, count = argc - recipients_arg;
5913 const uschar ** list = argv + recipients_arg;
5915 recipients_max_expanded = atoi(CCS rme);
5917 /* These options cannot be changed dynamically for non-SMTP messages */
5919 f.active_local_sender_retain = local_sender_retain;
5920 f.active_local_from_check = local_from_check;
5922 /* Save before any rewriting */
5924 raw_sender = string_copy(sender_address);
5926 /* Loop for each argument (supplied by user hence tainted) */
5928 for (int i = 0; i < count; i++)
5930 int start, end, domain;
5932 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5933 We'll still want to cap it to something, just in case. */
5934 uschar * s = string_copy_taint(
5935 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5938 /* Loop for each comma-separated address */
5942 BOOL finished = FALSE;
5944 uschar * ss = parse_find_address_end(s, FALSE);
5946 if (*ss == ',') *ss = 0; else finished = TRUE;
5948 /* Check max recipients - if -t was used, these aren't recipients */
5950 if ( recipients_max_expanded > 0 && ++rcount > recipients_max_expanded
5951 && !extract_recipients)
5953 DEBUG(D_all) debug_printf("excess reipients (max %d)\n",
5954 recipients_max_expanded);
5956 if (error_handling == ERRORS_STDERR)
5958 fprintf(stderr, "exim: too many recipients\n");
5959 exim_exit(EXIT_FAILURE);
5963 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5964 errors_sender_rc : EXIT_FAILURE;
5969 BOOL b = allow_utf8_domains;
5970 allow_utf8_domains = TRUE;
5973 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5977 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5978 else allow_utf8_domains = b;
5983 if (domain == 0 && !f.allow_unqualified_recipient)
5986 errmess = US"unqualified recipient address not allowed";
5991 DEBUG(D_all) debug_printf("bad recipient address \"%s\": %s\n",
5992 string_printing(list[i]), errmess);
5994 if (error_handling == ERRORS_STDERR)
5996 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5997 string_printing(list[i]), errmess);
5998 exim_exit(EXIT_FAILURE);
6004 eblock.text1 = string_printing(list[i]);
6005 eblock.text2 = errmess;
6007 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
6008 errors_sender_rc : EXIT_FAILURE;
6012 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
6015 while (*++s && (*s == ',' || isspace(*s)));
6019 /* Show the recipients when debugging */
6023 if (sender_address) debug_printf("Sender: %s\n", sender_address);
6024 if (recipients_list)
6026 debug_printf("Recipients:\n");
6027 for (int i = 0; i < recipients_count; i++)
6028 debug_printf(" %s\n", recipients_list[i].address);
6032 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
6033 ignored; rejecting here would just add complication, and it can just as
6034 well be done later. Allow $recipients to be visible in the ACL. */
6036 GET_OPTION("acl_not_smtp_start");
6037 if (acl_not_smtp_start)
6039 uschar * user_msg, * log_msg;
6040 f.enable_dollar_recipients = TRUE;
6041 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
6042 &user_msg, &log_msg);
6043 f.enable_dollar_recipients = FALSE;
6046 /* Pause for a while waiting for input. If none received in that time,
6047 close the logfile, if we had one open; then if we wait for a long-running
6048 datasource (months, in one use-case) log rotation will not leave us holding
6051 if (!receive_timeout)
6052 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
6055 /* Read the data for the message. If filter_test is not FTEST_NONE, this
6056 will just read the headers for the message, and not write anything onto the
6059 message_ended = END_NOTENDED;
6060 more = receive_msg(extract_recipients);
6062 /* more is always FALSE here (not SMTP message) when reading a message
6063 for real; when reading the headers of a message for filter testing,
6064 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
6066 if (!message_id[0]) exim_exit(EXIT_FAILURE);
6067 } /* Non-SMTP message reception */
6069 /* If this is a filter testing run, there are headers in store, but
6070 no message on the spool. Run the filtering code in testing mode, setting
6071 the domain to the qualify domain and the local part to the current user,
6072 unless they have been set by options. The prefix and suffix are left unset
6073 unless specified. The the return path is set to to the sender unless it has
6074 already been set from a return-path header in the message. */
6076 if (filter_test != FTEST_NONE)
6078 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
6079 deliver_domain_orig = deliver_domain;
6080 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
6081 deliver_localpart_orig = deliver_localpart;
6082 deliver_localpart_prefix = US ftest_prefix;
6083 deliver_localpart_suffix = US ftest_suffix;
6084 deliver_home = originator_home;
6088 printf("Return-path copied from sender\n");
6089 return_path = string_copy(sender_address);
6092 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
6093 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
6095 receive_add_recipient(
6096 string_sprintf("%s%s%s@%s",
6097 ftest_prefix ? ftest_prefix : US"",
6099 ftest_suffix ? ftest_suffix : US"",
6100 deliver_domain), -1);
6102 printf("Recipient = %s\n", recipients_list[0].address);
6103 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
6104 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
6106 if (chdir("/")) /* Get away from wherever the user is running this from */
6108 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
6109 exim_exit(EXIT_FAILURE);
6112 /* Now we run either a system filter test, or a user filter test, or both.
6113 In the latter case, headers added by the system filter will persist and be
6114 available to the user filter. We need to copy the filter variables
6117 if (filter_test & FTEST_SYSTEM)
6118 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
6119 exim_exit(EXIT_FAILURE);
6121 memcpy(filter_sn, filter_n, sizeof(filter_sn));
6123 if (filter_test & FTEST_USER)
6124 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
6125 exim_exit(EXIT_FAILURE);
6127 exim_exit(EXIT_SUCCESS);
6130 /* Else act on the result of message reception. We should not get here unless
6131 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
6132 will be TRUE. If it is not, check on the number of messages received in this
6135 if ( !session_local_queue_only
6136 && smtp_accept_queue_per_connection > 0
6137 && receive_messagecount > smtp_accept_queue_per_connection)
6139 session_local_queue_only = TRUE;
6140 queue_only_reason = 2;
6143 /* Initialize local_queue_only from session_local_queue_only. If it is false,
6144 and queue_only_load is set, check that the load average is below it. If it is
6145 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
6146 default), we put the whole session into queue_only mode. It then remains this
6147 way for any subsequent messages on the same SMTP connection. This is a
6148 deliberate choice; even though the load average may fall, it doesn't seem
6149 right to deliver later messages on the same call when not delivering earlier
6150 ones. However, there are odd cases where this is not wanted, so this can be
6151 changed by setting queue_only_load_latch false. */
6153 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
6154 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
6156 queue_only_reason = 3;
6157 if (queue_only_load_latch) session_local_queue_only = TRUE;
6160 /* If running as an MUA wrapper, all queueing options and freezing options
6164 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6166 /* Log the queueing here, when it will get a message id attached, but
6167 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6170 if (local_queue_only)
6172 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6173 switch(queue_only_reason)
6176 log_write(L_delay_delivery,
6177 LOG_MAIN, "no immediate delivery: more than %d messages "
6178 "received in one connection", smtp_accept_queue_per_connection);
6182 log_write(L_delay_delivery,
6183 LOG_MAIN, "no immediate delivery: load average %.2f",
6184 (double)load_average/1000.0);
6189 else if (f.queue_only_policy || f.deliver_freeze)
6190 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6192 /* Else do the delivery unless the ACL or local_scan() called for queue only
6193 or froze the message. Always deliver in a separate process. A fork failure is
6194 not a disaster, as the delivery will eventually happen on a subsequent queue
6195 run. The search cache must be tidied before the fork, as the parent will
6196 do it before exiting. The child will trigger a lookup failure and
6197 thereby defer the delivery if it tries to use (for example) a cached ldap
6198 connection that the parent has called unbind on. */
6205 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6208 close_unwanted(); /* Close unwanted file descriptors and TLS */
6209 exim_nullstd(); /* Ensure std{in,out,err} exist */
6211 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6212 mode, deliver_drop_privilege is forced TRUE). */
6214 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6216 delivery_re_exec(CEE_EXEC_EXIT);
6217 /* Control does not return here. */
6220 /* No need to re-exec */
6222 rc = deliver_message(message_id, FALSE, FALSE);
6224 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6225 ? EXIT_SUCCESS : EXIT_FAILURE);
6230 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6231 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6232 "process: %s", strerror(errno));
6236 release_cutthrough_connection(US"msg passed for delivery");
6238 /* In the parent, wait if synchronous delivery is required. This will
6239 always be the case in MUA wrapper mode. */
6241 if (f.synchronous_delivery)
6244 while (wait(&status) != pid);
6245 if ((status & 0x00ff) != 0)
6246 log_write(0, LOG_MAIN|LOG_PANIC,
6247 "process %d crashed with signal %d while delivering %s",
6248 (int)pid, status & 0x00ff, message_id);
6249 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6254 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6255 automatically reaps children (see comments above the loop), clear away any
6256 finished subprocesses here, in case there are lots of messages coming in
6257 from the same source. */
6259 #ifndef SIG_IGN_WORKS
6260 while (waitpid(-1, NULL, WNOHANG) > 0);
6264 return_path = sender_address = NULL;
6265 authenticated_sender = NULL;
6266 deliver_localpart_orig = NULL;
6267 deliver_domain_orig = NULL;
6268 deliver_host = deliver_host_address = NULL;
6269 dnslist_domain = dnslist_matched = NULL;
6270 #ifdef WITH_CONTENT_SCAN
6271 malware_name = NULL;
6274 callout_address = NULL;
6275 sending_ip_address = NULL;
6276 deliver_localpart_data = deliver_domain_data =
6277 recipient_data = sender_data = NULL;
6279 lookup_value = NULL; /* Can be set by ACL */
6281 store_reset(reset_point);
6284 exim_exit(EXIT_SUCCESS); /* Never returns */
6285 return 0; /* To stop compiler warning */