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 #ifdef 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");
1055 b = string_cat(b, US" cdb");
1057 d = string_cat(d, US" cdb");
1062 b = string_cat(b, US" dbm dbmjz dbmnz");
1064 d = string_cat(d, US" dbm dbmjz dbmnz");
1068 # if LOOKUP_DNSDB!=2
1069 b = string_cat(b, US" dnsdb");
1071 d = string_cat(d, US" dnsdb");
1074 #ifdef LOOKUP_DSEARCH
1075 # if LOOKUP_DSEARCH!=2
1076 b = string_cat(b, US" dsearch");
1078 d = string_cat(d, US" dsearch");
1082 # if LOOKUP_IBASE!=2
1083 b = string_cat(b, US" ibase");
1085 d = string_cat(d, US" ibase");
1090 b = string_cat(b, US" json");
1092 d = string_cat(d, US" json");
1097 b = string_cat(b, US" ldap ldapdn ldapm");
1099 d = string_cat(d, US" ldap ldapdn ldapm");
1104 b = string_cat(b, US" lmdb");
1106 d = string_cat(d, US" lmdb");
1110 # if LOOKUP_MYSQL!=2
1111 b = string_cat(b, US" mysql");
1113 d = string_cat(d, US" mysql");
1118 b = string_cat(b, US" nis nis0");
1120 d = string_cat(d, US" nis nis0");
1123 #ifdef LOOKUP_NISPLUS
1124 # if LOOKUP_NISPLUS!=2
1125 b = string_cat(b, US" nisplus");
1127 d = string_cat(d, US" nisplus");
1130 #ifdef LOOKUP_ORACLE
1131 # if LOOKUP_ORACLE!=2
1132 b = string_cat(b, US" oracle");
1134 d = string_cat(d, US" oracle");
1137 #ifdef LOOKUP_PASSWD
1138 # if LOOKUP_PASSWD!=2
1139 b = string_cat(b, US" passwd");
1141 d = string_cat(d, US" passwd");
1145 # if LOOKUP_PGSQL!=2
1146 b = string_cat(b, US" pgsql");
1148 d = string_cat(d, US" pgsql");
1152 # if LOOKUP_REDIS!=2
1153 b = string_cat(b, US" redis");
1155 d = string_cat(d, US" redis");
1158 #ifdef LOOKUP_SQLITE
1159 # if LOOKUP_SQLITE!=2
1160 b = string_cat(b, US" sqlite");
1162 d = string_cat(d, US" sqlite");
1165 #ifdef LOOKUP_TESTDB
1166 # if LOOKUP_TESTDB!=2
1167 b = string_cat(b, US" testdb");
1169 d = string_cat(d, US" testdb");
1172 #ifdef LOOKUP_WHOSON
1173 # if LOOKUP_WHOSON!=2
1174 b = string_cat(b, US" whoson");
1176 d = string_cat(d, US" whoson");
1180 if (b) g = string_fmt_append(g, "Lookups (built-in):%Y\n", b);
1181 if (d) g = string_fmt_append(g, "Lookups (dynamic): %Y\n", d);
1187 lookup_version_report_cb(uschar * name, uschar * ptr, void * ctx)
1189 const lookup_info * li = (lookup_info *)ptr;
1190 gstring ** gp = ctx;
1192 if (li->version_report)
1193 *gp = li->version_report(*gp);
1197 /* This function is called for -bV/--version and for -d to output the optional
1198 features of the current Exim binary.
1200 Arguments: BOOL, true for stdout else debug channel
1205 show_whats_supported(BOOL is_stdout)
1207 rmark reset_point = store_mark();
1210 DEBUG(D_any) {} else g = show_db_version(g);
1212 g = string_cat(g, US"Support for:");
1213 #ifdef WITH_CONTENT_SCAN
1214 g = string_cat(g, US" Content_Scanning");
1216 #ifdef SUPPORT_CRYPTEQ
1217 g = string_cat(g, US" crypteq");
1219 #ifdef EXPAND_DLFUNC
1220 g = string_cat(g, US" Expand_dlfunc");
1223 g = string_cat(g, US" iconv()");
1226 g = string_cat(g, US" IPv6");
1229 g = string_cat(g, US" PAM");
1232 g = string_cat(g, US" Perl");
1235 g = string_cat(g, US" GnuTLS");
1237 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1238 g = string_cat(g, US" move_frozen_messages");
1241 g = string_cat(g, US" OpenSSL");
1243 #if defined(CYRUS_PWCHECK_SOCKET)
1244 g = string_cat(g, US" pwcheck");
1246 #if defined(RADIUS_CONFIG_FILE)
1247 g = string_cat(g, US" radius");
1249 #ifndef DISABLE_TLS_RESUME
1250 g = string_cat(g, US" TLS_resume");
1252 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1253 g = string_cat(g, US" translate_ip_address");
1255 #ifdef USE_TCP_WRAPPERS
1256 g = string_cat(g, US" TCPwrappers");
1258 #ifdef HAVE_SETCLASSRESOURCES
1259 g = string_cat(g, US" use_setclassresources");
1262 g = string_cat(g, US" DANE");
1264 #ifndef DISABLE_DKIM
1265 g = string_cat(g, US" DKIM");
1267 #ifdef SUPPORT_DMARC
1268 g = string_cat(g, US" DMARC");
1270 #ifndef DISABLE_DNSSEC
1271 g = string_cat(g, US" DNSSEC");
1273 #ifndef DISABLE_ESMTP_LIMITS
1274 g = string_cat(g, US" ESMTP_Limits");
1276 #ifndef DISABLE_WELLKNOWN
1277 g = string_cat(g, US" ESMTP_Wellknown");
1279 #ifndef DISABLE_EVENT
1280 g = string_cat(g, US" Event");
1283 g = string_cat(g, US" I18N");
1285 #ifndef DISABLE_OCSP
1286 g = string_cat(g, US" OCSP");
1288 #ifndef DISABLE_PIPE_CONNECT
1289 g = string_cat(g, US" PIPECONNECT");
1291 #ifndef DISABLE_PRDR
1292 g = string_cat(g, US" PRDR");
1294 #ifdef SUPPORT_PROXY
1295 g = string_cat(g, US" PROXY");
1297 #ifndef DISABLE_QUEUE_RAMP
1298 g = string_cat(g, US" Queue_Ramp");
1300 #ifdef SUPPORT_SOCKS
1301 g = string_cat(g, US" SOCKS");
1304 g = string_cat(g, US" SPF");
1306 #if defined(SUPPORT_SRS)
1307 g = string_cat(g, US" SRS");
1311 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1313 #ifdef EXPERIMENTAL_ARC
1314 g = string_cat(g, US" Experimental_ARC");
1316 #ifdef EXPERIMENTAL_BRIGHTMAIL
1317 g = string_cat(g, US" Experimental_Brightmail");
1319 #ifdef EXPERIMENTAL_DCC
1320 g = string_cat(g, US" Experimental_DCC");
1322 #ifdef EXPERIMENTAL_DSN_INFO
1323 g = string_cat(g, US" Experimental_DSN_info");
1325 #ifdef EXPERIMENTAL_QUEUEFILE
1326 g = string_cat(g, US" Experimental_QUEUEFILE");
1328 #ifdef EXPERIMENTAL_XCLIENT
1329 g = string_cat(g, US" Experimental_XCLIENT");
1331 g = string_cat(g, US"\n");
1333 g = lookup_show_supported(g);
1334 g = auth_show_supported(g);
1335 g = route_show_supported(g);
1336 g = transport_show_supported(g);
1338 #ifdef WITH_CONTENT_SCAN
1339 g = malware_show_supported(g);
1341 show_string(is_stdout, g); g = NULL;
1343 if (fixed_never_users[0] > 0)
1346 g = string_cat(g, US"Fixed never_users: ");
1347 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1348 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1349 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1352 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1354 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1356 /* Everything else is details which are only worth reporting when debugging.
1357 Perhaps the tls_version_report should move into this too. */
1361 /* clang defines __GNUC__ (at least, for me) so test for it first */
1362 #if defined(__clang__)
1363 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1364 #elif defined(__GNUC__)
1366 g = string_fmt_append(g, "Compiler: GCC [%s]\n", __VERSION__);
1368 g = string_fmt_append(g, "Compiler: GCC [%s]\n", "? unknown version ?";
1371 g = string_cat(g, US"Compiler: <unknown>\n");
1374 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1375 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1376 __GLIBC__, __GLIBC_MINOR__);
1377 if (__GLIBC_PREREQ(2, 1))
1378 g = string_fmt_append(g, " Runtime: %s\n",
1379 gnu_get_libc_version());
1382 g = show_db_version(g);
1385 g = tls_version_report(g);
1388 g = utf8_version_report(g);
1390 #ifdef SUPPORT_DMARC
1391 g = dmarc_version_report(g);
1394 g = spf_lib_version_report(g);
1397 show_string(is_stdout, g);
1400 for (auth_info * ai = auths_available; ai; ai = (auth_info *)ai->drinfo.next)
1401 if (ai->version_report)
1402 g = (*ai->version_report)(g);
1404 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1405 characters; unless it's an ancient version of PCRE in which case it
1407 #ifndef PCRE_PRERELEASE
1408 # define PCRE_PRERELEASE
1411 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1414 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1415 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1417 PCRE2_MAJOR, PCRE2_MINOR,
1418 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1422 #undef EXPAND_AND_QUOTE
1424 show_string(is_stdout, g);
1428 tree_walk(lookups_tree, lookup_version_report_cb, &g);
1429 show_string(is_stdout, g);
1432 #ifdef WHITELIST_D_MACROS
1433 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1435 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1437 #ifdef TRUSTED_CONFIG_LIST
1438 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1440 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1444 show_string(is_stdout, g);
1445 store_reset(reset_point);
1449 /*************************************************
1450 * Show auxiliary information about Exim *
1451 *************************************************/
1454 show_exim_information(enum commandline_info request, FILE *stream)
1459 fprintf(stream, "Oops, something went wrong.\n");
1463 "The -bI: flag takes a string indicating which information to provide.\n"
1464 "If the string is not recognised, you'll get this help (on stderr).\n"
1466 " exim -bI:help this information\n"
1467 " exim -bI:dscp list of known dscp value keywords\n"
1468 " exim -bI:sieve list of supported sieve extensions\n"
1472 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1473 fprintf(stream, "%s\n", *pp);
1476 dscp_list_to_stream(stream);
1482 /*************************************************
1483 * Quote a local part *
1484 *************************************************/
1486 /* This function is used when a sender address or a From: or Sender: header
1487 line is being created from the caller's login, or from an authenticated_id. It
1488 applies appropriate quoting rules for a local part.
1490 Argument: the local part
1491 Returns: the local part, quoted if necessary
1495 local_part_quote(const uschar * lpart)
1497 BOOL needs_quote = FALSE;
1500 for (const uschar * t = lpart; !needs_quote && *t; t++)
1501 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1502 (*t != '.' || t == lpart || t[1] == 0);
1504 if (!needs_quote) return lpart;
1506 g = string_catn(NULL, US"\"", 1);
1510 uschar * nq = US Ustrpbrk(lpart, "\\\"");
1513 g = string_cat(g, lpart);
1516 g = string_catn(g, lpart, nq - lpart);
1517 g = string_catn(g, US"\\", 1);
1518 g = string_catn(g, nq, 1);
1522 g = string_catn(g, US"\"", 1);
1523 return string_from_gstring(g);
1529 /*************************************************
1530 * Load readline() functions *
1531 *************************************************/
1533 /* This function is called from testing executions that read data from stdin,
1534 but only when running as the calling user. Currently, only -be does this. The
1535 function loads the readline() function library and passes back the functions.
1536 On some systems, it needs the curses library, so load that too, but try without
1537 it if loading fails. All this functionality has to be requested at build time.
1540 fn_readline_ptr pointer to where to put the readline pointer
1541 fn_addhist_ptr pointer to where to put the addhistory function
1543 Returns: the dlopen handle or NULL on failure
1547 set_readline(char * (**fn_readline_ptr)(const char *),
1548 void (**fn_addhist_ptr)(const char *))
1551 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1553 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1554 if (dlhandle_curses) dlclose(dlhandle_curses);
1558 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1559 * char * readline (const char *prompt);
1560 * void add_history (const char *string);
1562 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1563 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1566 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1574 /*************************************************
1575 * Get a line from stdin for testing things *
1576 *************************************************/
1578 /* This function is called when running tests that can take a number of lines
1579 of input (for example, -be and -bt). It handles continuations and trailing
1580 spaces. And prompting and a blank line output on eof. If readline() is in use,
1581 the arguments are non-NULL and provide the relevant functions.
1584 fn_readline readline function or NULL
1585 fn_addhist addhist function or NULL
1587 Returns: pointer to dynamic memory, or NULL at end of file
1591 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1594 BOOL had_input = FALSE;
1596 if (!fn_readline) { printf("> "); fflush(stdout); }
1598 for (int i = 0;; i++)
1600 uschar buffer[1024];
1604 char *readline_line = NULL;
1607 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1608 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1609 p = US readline_line;
1614 /* readline() not in use */
1617 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1621 /* Handle the line */
1624 ss = p + Ustrlen(p);
1625 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1628 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1630 g = string_catn(g, p, ss - p);
1633 if (fn_readline) free(readline_line);
1636 /* g can only be NULL if ss==p */
1637 if (ss == p || gstring_last_char(g) != '\\') /* not continuation; done */
1640 gstring_trim(g, 1); /* drop the \ */
1643 if (had_input) return g ? string_from_gstring(g) : US"";
1650 /*************************************************
1651 * Output usage information for the program *
1652 *************************************************/
1654 /* This function is called when there are no recipients
1655 or a specific --help argument was added.
1658 progname information on what name we were called by
1660 Returns: DOES NOT RETURN
1664 exim_usage(const uschar * progname)
1667 /* Handle specific program invocation variants */
1668 if (Ustrcmp(progname, US"-mailq") == 0)
1670 "mailq - list the contents of the mail queue\n\n"
1671 "For a list of options, see the Exim documentation.\n");
1673 /* Generic usage - we output this whatever happens */
1675 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1676 "not directly from a shell command line. Options and/or arguments control\n"
1677 "what it does when called. For a list of options, see the Exim documentation.\n");
1682 /*************************************************
1683 * Validate that the macros given are okay *
1684 *************************************************/
1686 /* Typically, Exim will drop privileges if macros are supplied. In some
1687 cases, we want to not do so.
1689 Arguments: opt_D_used - true if the commandline had a "-D" option
1690 Returns: true if trusted, false otherwise
1694 macros_trusted(BOOL opt_D_used)
1696 #ifdef WHITELIST_D_MACROS
1697 uschar *whitelisted, *end, *p, **whites;
1698 int white_count, i, n;
1700 BOOL prev_char_item, found;
1705 #ifndef WHITELIST_D_MACROS
1709 /* We only trust -D overrides for some invoking users:
1710 root, the exim run-time user, the optional config owner user.
1711 I don't know why config-owner would be needed, but since they can own the
1712 config files anyway, there's no security risk to letting them override -D. */
1713 if ( ! ((real_uid == root_uid)
1714 || (real_uid == exim_uid)
1715 #ifdef CONFIGURE_OWNER
1716 || (real_uid == config_uid)
1720 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1724 /* Get a list of macros which are whitelisted */
1725 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1726 prev_char_item = FALSE;
1728 for (p = whitelisted; *p != '\0'; ++p)
1730 if (*p == ':' || isspace(*p))
1735 prev_char_item = FALSE;
1738 if (!prev_char_item)
1739 prev_char_item = TRUE;
1746 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1747 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1752 if (i == white_count)
1754 while (*p != '\0' && p < end)
1760 /* The list of commandline macros should be very short.
1761 Accept the N*M complexity. */
1762 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1765 for (uschar ** w = whites; *w; ++w)
1766 if (Ustrcmp(*w, m->name) == 0)
1773 if (!m->replacement)
1775 if ((len = m->replen) == 0)
1777 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1780 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1786 /*************************************************
1787 * Expansion testing *
1788 *************************************************/
1790 /* Expand and print one item, doing macro-processing.
1793 item line for expansion
1797 expansion_test_line(const uschar * line)
1803 Ustrncpy(big_buffer, line, big_buffer_size);
1804 big_buffer[big_buffer_size-1] = '\0';
1805 len = Ustrlen(big_buffer);
1807 (void) macros_expand(0, &len, &dummy_macexp);
1809 #ifdef LOOKUP_MODULE_DIR
1810 //mod_load_check(big_buffer);
1813 if (isupper(big_buffer[0]))
1815 if (macro_read_assignment(big_buffer))
1816 printf("Defined macro '%s'\n", mlast->name);
1818 else if (Ustrncmp(big_buffer, "set,t ", 6) == 0)
1819 printf("%s\n", acl_standalone_setvar(big_buffer+6, TRUE));
1820 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1821 printf("%s\n", acl_standalone_setvar(big_buffer+4, FALSE));
1823 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1824 else printf("Failed: %s\n", expand_string_message);
1829 /*************************************************
1830 * Queue-runner operations *
1831 *************************************************/
1833 /* Prefix a new qrunner descriptor to the qrunners list */
1838 qrunner * q = qrunners;
1839 qrunners = store_get(sizeof(qrunner), GET_UNTAINTED);
1840 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1842 qrunners->next_tick = time(NULL); /* run right away */
1847 alloc_onetime_qrunner(void)
1849 qrunners = store_get_perm(sizeof(qrunner), GET_UNTAINTED);
1850 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1851 qrunners->next_tick = time(NULL); /* run right away */
1852 qrunners->run_max = 1;
1857 /*************************************************
1858 * Entry point and high-level code *
1859 *************************************************/
1861 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1862 the appropriate action. All the necessary functions are present in the one
1863 binary. I originally thought one should split it up, but it turns out that so
1864 much of the apparatus is needed in each chunk that one might as well just have
1865 it all available all the time, which then makes the coding easier as well.
1868 argc count of entries in argv
1869 argv argument strings, with argv[0] being the program name
1871 Returns: EXIT_SUCCESS if terminated successfully
1872 EXIT_FAILURE otherwise, except when a message has been sent
1873 to the sender, and -oee was given
1877 main(int argc, char ** cargv)
1879 const uschar ** argv = CUSS cargv;
1880 int arg_receive_timeout = -1;
1881 int arg_smtp_receive_timeout = -1;
1882 int arg_error_handling = error_handling;
1883 int filter_sfd = -1;
1884 int filter_ufd = -1;
1887 int list_queue_option = QL_BASIC;
1889 int msg_action_arg = -1;
1890 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1891 int queue_only_reason = 0;
1893 int perl_start_option = 0;
1895 int recipients_arg = argc;
1896 int sender_address_domain = 0;
1897 int test_retry_arg = -1;
1898 int test_rewrite_arg = -1;
1899 gid_t original_egid;
1900 BOOL arg_queue_only = FALSE;
1901 BOOL bi_option = FALSE;
1902 BOOL checking = FALSE;
1903 BOOL count_queue = FALSE;
1904 BOOL expansion_test = FALSE;
1905 BOOL extract_recipients = FALSE;
1906 BOOL flag_G = FALSE;
1907 BOOL flag_n = FALSE;
1908 BOOL forced_delivery = FALSE;
1909 BOOL f_end_dot = FALSE;
1910 BOOL deliver_give_up = FALSE;
1911 BOOL list_queue = FALSE;
1912 BOOL list_options = FALSE;
1913 BOOL list_config = FALSE;
1914 BOOL local_queue_only;
1915 BOOL one_msg_action = FALSE;
1916 BOOL opt_D_used = FALSE;
1917 BOOL queue_only_set = FALSE;
1918 BOOL receiving_message = TRUE;
1919 BOOL sender_ident_set = FALSE;
1920 BOOL session_local_queue_only;
1922 BOOL removed_privilege = FALSE;
1923 BOOL usage_wanted = FALSE;
1924 BOOL verify_address_mode = FALSE;
1925 BOOL verify_as_sender = FALSE;
1926 BOOL rcpt_verify_quota = FALSE;
1927 BOOL version_printed = FALSE;
1928 const uschar * alias_arg = NULL;
1929 const uschar * called_as = US"";
1930 const uschar * cmdline_syslog_name = NULL;
1931 const uschar * start_queue_run_id = NULL;
1932 const uschar * stop_queue_run_id = NULL;
1933 const uschar * expansion_test_message = NULL;
1934 const uschar * ftest_domain = NULL;
1935 const uschar * ftest_localpart = NULL;
1936 const uschar * ftest_prefix = NULL;
1937 const uschar * ftest_suffix = NULL;
1938 uschar * log_oneline = NULL;
1939 const uschar * malware_test_file = NULL;
1940 const uschar * real_sender_address;
1941 uschar * originator_home = US"/";
1945 struct stat statbuf;
1946 pid_t passed_qr_pid = (pid_t)0;
1947 int passed_qr_pipe = -1;
1948 gid_t group_list[EXIM_GROUPLIST_SIZE];
1950 /* For the -bI: flag */
1951 enum commandline_info info_flag = CMDINFO_NONE;
1952 BOOL info_stdout = FALSE;
1954 /* Possible options for -R and -S */
1956 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1958 /* Need to define this in case we need to change the environment in order
1959 to get rid of a bogus time zone. We have to make it char rather than uschar
1960 because some OS define it in /usr/include/unistd.h. */
1962 extern char **environ;
1964 #ifdef MEASURE_TIMING
1965 (void)gettimeofday(×tamp_startup, NULL);
1968 store_init(); /* Initialise the memory allocation susbsystem */
1969 pcre_init(); /* Set up memory handling for pcre */
1971 /* If the Exim user and/or group and/or the configuration file owner/group were
1972 defined by ref:name at build time, we must now find the actual uid/gid values.
1973 This is a feature to make the lives of binary distributors easier. */
1975 #ifdef EXIM_USERNAME
1976 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1979 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1981 /* If ref:name uses a number as the name, route_finduser() returns
1982 TRUE with exim_uid set and pw coerced to NULL. */
1984 exim_gid = pw->pw_gid;
1985 #ifndef EXIM_GROUPNAME
1988 "exim: ref:name should specify a usercode, not a group.\n"
1989 "exim: can't let you get away with it unless you also specify a group.\n");
1993 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1996 #ifdef EXIM_GROUPNAME
1997 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1998 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
2001 #ifdef CONFIGURE_OWNERNAME
2002 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
2003 exim_fail("exim: failed to find uid for user name \"%s\"\n",
2004 CONFIGURE_OWNERNAME);
2007 /* We default the system_filter_user to be the Exim run-time user, as a
2008 sane non-root value. */
2009 system_filter_uid = exim_uid;
2011 #ifdef CONFIGURE_GROUPNAME
2012 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
2013 exim_fail("exim: failed to find gid for group name \"%s\"\n",
2014 CONFIGURE_GROUPNAME);
2017 /* In the Cygwin environment, some initialization used to need doing.
2018 It was fudged in by means of this macro; now no longer but we'll leave
2019 it in case of others. */
2025 /* Check a field which is patched when we are running Exim within its
2026 testing harness; do a fast initial check, and then the whole thing. */
2028 f.running_in_test_harness =
2029 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
2030 if (f.running_in_test_harness)
2033 /* Protect against abusive argv[0] */
2034 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
2035 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
2037 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
2038 at the start of a program; however, it seems that some environments do not
2039 follow this. A "strange" locale can affect the formatting of timestamps, so we
2042 setlocale(LC_ALL, "C");
2044 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
2046 #ifdef _POSIX_MONOTONIC_CLOCK
2050 /* Set up the default handler for timing using alarm(). */
2052 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2054 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
2055 because store_malloc writes a log entry on failure. */
2057 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
2058 exim_fail("exim: failed to get store for log buffer\n");
2060 /* Initialize the default log options. */
2062 bits_set(log_selector, log_selector_size, log_default);
2064 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
2065 NULL when the daemon is run and the file is closed. We have to use this
2066 indirection, because some systems don't allow writing to the variable "stderr".
2069 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
2071 /* Ensure there is a big buffer for temporary use in several places. It is put
2072 in malloc store so that it can be freed for enlargement if necessary. */
2074 big_buffer = store_malloc(big_buffer_size);
2076 /* Set up the handler for the data request signal, and set the initial
2077 descriptive text. */
2079 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
2080 set_process_info("initializing");
2081 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
2084 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
2085 sigaction(SIGSEGV, &act, NULL);
2088 signal(SIGSEGV, segv_handler); /* log faults */
2091 /* If running in a dockerized environment, the TERM signal is only
2092 delegated to the PID 1 if we request it by setting an signal handler */
2094 if (getpid() == 1) signal(SIGTERM, term_handler);
2096 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
2097 in the daemon code. For the rest of Exim's uses, we ignore it. */
2099 signal(SIGHUP, SIG_IGN);
2101 /* We don't want to die on pipe errors as the code is written to handle
2102 the write error instead. */
2104 signal(SIGPIPE, SIG_IGN);
2106 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
2107 set to SIG_IGN. This causes subprocesses that complete before the parent
2108 process waits for them not to hang around, so when Exim calls wait(), nothing
2109 is there. The wait() code has been made robust against this, but let's ensure
2110 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
2111 ending status. We use sigaction rather than plain signal() on those OS where
2112 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
2113 problem on AIX with this.) */
2117 struct sigaction act;
2118 act.sa_handler = SIG_DFL;
2119 sigemptyset(&(act.sa_mask));
2121 sigaction(SIGCHLD, &act, NULL);
2124 signal(SIGCHLD, SIG_DFL);
2127 /* Save the arguments for use if we re-exec exim as a daemon after receiving
2132 /* Set up the version number. Set up the leading 'E' for the external form of
2133 message ids, set the pointer to the internal form, and initialize it to
2134 indicate no message being processed. */
2137 message_id_option[0] = '-';
2138 message_id_external = message_id_option + 1;
2139 message_id_external[0] = 'E';
2140 message_id = message_id_external + 1;
2143 /* Set the umask to zero so that any files Exim creates using open() are
2144 created with the modes that it specifies. NOTE: Files created with fopen() have
2145 a problem, which was not recognized till rather late (February 2006). With this
2146 umask, such files will be world writeable. (They are all content scanning files
2147 in the spool directory, which isn't world-accessible, so this is not a
2148 disaster, but it's untidy.) I don't want to change this overall setting,
2149 however, because it will interact badly with the open() calls. Instead, there's
2150 now a function called modefopen() that fiddles with the umask while calling
2155 /* Precompile the regular expression for matching a message id. Keep this in
2156 step with the code that generates ids in the accept.c module. We need to do
2157 this here, because the -M options check their arguments for syntactic validity
2158 using mac_ismsgid, which uses this. */
2161 regex_must_compile(US"^(?:"
2162 "[^\\W_]{" str(MESSAGE_ID_TIME_LEN) "}"
2163 "-[^\\W_]{" str(MESSAGE_ID_PID_LEN) "}"
2164 "-[^\\W_]{" str(MESSAGE_ID_SUBTIME_LEN) "}"
2166 "(?:[^\\W_]{6}-){2}[^\\W_]{2}" /* old ID format */
2170 /* Precompile the regular expression that is used for matching an SMTP error
2171 code, possibly extended, at the start of an error message. Note that the
2172 terminating whitespace character is included. */
2175 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2178 #ifdef WHITELIST_D_MACROS
2179 /* Precompile the regular expression used to filter the content of macros
2180 given to -D for permissibility. */
2182 regex_whitelisted_macro =
2183 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2186 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2187 this seems to be a generally accepted convention, since one finds symbolic
2188 links called "mailq" in standard OS configurations. */
2190 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2191 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2194 receiving_message = FALSE;
2195 called_as = US"-mailq";
2198 /* If the program is called as "rmail" treat it as equivalent to
2199 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2200 i.e. preventing a single dot on a line from terminating the message, and
2201 returning with zero return code, even in cases of error (provided an error
2202 message has been sent). */
2204 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2205 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2208 called_as = US"-rmail";
2209 errors_sender_rc = EXIT_SUCCESS;
2212 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2213 this is a smail convention. */
2215 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2216 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2218 smtp_input = smtp_batched_input = TRUE;
2219 called_as = US"-rsmtp";
2222 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2223 this is a smail convention. */
2225 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2226 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2228 alloc_onetime_qrunner();
2229 receiving_message = FALSE;
2230 called_as = US"-runq";
2233 /* If the program is called as "newaliases" treat it as equivalent to
2234 "exim -bi"; this is a sendmail convention. */
2236 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2237 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2240 receiving_message = FALSE;
2241 called_as = US"-newaliases";
2244 /* Save the original effective uid for a couple of uses later. It should
2245 normally be root, but in some esoteric environments it may not be. */
2247 original_euid = geteuid();
2248 original_egid = getegid();
2250 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2251 to be the same as the real ones. This makes a difference only if Exim is setuid
2252 (or setgid) to something other than root, which could be the case in some
2253 special configurations. */
2255 real_uid = getuid();
2256 real_gid = getgid();
2258 if (real_uid == root_uid)
2260 if ((rv = setgid(real_gid)))
2261 exim_fail("exim: setgid(%ld) failed: %s\n",
2262 (long int)real_gid, strerror(errno));
2263 if ((rv = setuid(real_uid)))
2264 exim_fail("exim: setuid(%ld) failed: %s\n",
2265 (long int)real_uid, strerror(errno));
2268 /* If neither the original real uid nor the original euid was root, Exim is
2269 running in an unprivileged state. */
2271 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2273 /* For most of the args-parsing we need to use permanent pool memory */
2275 int old_pool = store_pool;
2276 store_pool = POOL_PERM;
2278 /* Scan the program's arguments. Some can be dealt with right away; others are
2279 simply recorded for checking and handling afterwards. Do a high-level switch
2280 on the second character (the one after '-'), to save some effort. */
2282 for (i = 1; i < argc; i++)
2284 BOOL badarg = FALSE;
2285 const uschar * arg = argv[i];
2286 const uschar * argrest;
2289 /* An argument not starting with '-' is the start of a recipients list;
2290 break out of the options-scanning loop. */
2298 /* An option consisting of -- terminates the options */
2300 if (Ustrcmp(arg, "--") == 0)
2302 recipients_arg = i + 1;
2306 /* Handle flagged options */
2308 switchchar = arg[1];
2311 /* Make all -ex options synonymous with -oex arguments, since that
2312 is assumed by various callers. Also make -qR options synonymous with -R
2313 options, as that seems to be required as well. Allow for -qqR too, and
2314 the same for -S options. */
2316 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2317 Ustrncmp(arg+1, "qR", 2) == 0 ||
2318 Ustrncmp(arg+1, "qS", 2) == 0)
2320 switchchar = arg[2];
2323 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2325 switchchar = arg[3];
2327 f.queue_2stage = TRUE;
2330 /* Make -r synonymous with -f, since it is a documented alias */
2332 else if (arg[1] == 'r') switchchar = 'f';
2334 /* Make -ov synonymous with -v */
2336 else if (Ustrcmp(arg, "-ov") == 0)
2342 /* deal with --option_aliases */
2343 else if (switchchar == '-')
2345 if (Ustrcmp(argrest, "help") == 0)
2347 usage_wanted = TRUE;
2350 else if (Ustrcmp(argrest, "version") == 0)
2357 /* High-level switch on active initial letter */
2362 /* sendmail uses -Ac and -Am to control which .cf file is used;
2365 if (!*argrest) { badarg = TRUE; break; }
2368 BOOL ignore = FALSE;
2373 if (*(argrest + 1) == '\0')
2377 if (!ignore) badarg = TRUE;
2381 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2382 so has no need of it. */
2385 if (!*argrest) i++; /* Skip over the type */
2391 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2395 /* -bd: Run in daemon mode, awaiting SMTP connections.
2396 -bdf: Ditto, but in the foreground.
2399 f.daemon_listen = f.daemon_scion = TRUE;
2400 if (*argrest == 'f') f.background_daemon = FALSE;
2401 else if (*argrest) badarg = TRUE;
2404 /* -be: Run in expansion test mode
2405 -bem: Ditto, but read a message from a file first
2408 expansion_test = checking = TRUE;
2409 if (*argrest == 'm')
2411 if (++i >= argc) { badarg = TRUE; break; }
2412 expansion_test_message = argv[i];
2415 if (*argrest) badarg = TRUE;
2418 /* -bF: Run system filter test */
2420 filter_test |= checking = FTEST_SYSTEM;
2421 if (*argrest) badarg = TRUE;
2422 else if (++i < argc) filter_test_sfile = argv[i];
2423 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2426 /* -bf: Run user filter test
2427 -bfd: Set domain for filter testing
2428 -bfl: Set local part for filter testing
2429 -bfp: Set prefix for filter testing
2430 -bfs: Set suffix for filter testing
2435 filter_test |= checking = FTEST_USER;
2436 if (++i < argc) filter_test_ufile = argv[i];
2437 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2442 exim_fail("exim: string expected after %s\n", arg);
2443 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2444 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2445 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2446 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2451 /* -bh: Host checking - an IP address must follow. */
2453 if ( (!*argrest || Ustrcmp(argrest, "c") == 0)
2456 sender_host_address = string_copy_taint(
2457 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2459 host_checking = checking = f.log_testing_mode = TRUE;
2460 f.host_checking_callout = *argrest == 'c';
2461 message_logs = FALSE;
2467 /* -bi: This option is used by sendmail to initialize *the* alias file,
2468 though it has the -oA option to specify a different file. Exim has no
2469 concept of *the* alias file, but since Sun's YP make script calls
2470 sendmail this way, some support must be provided. */
2472 if (!*argrest) bi_option = TRUE;
2476 /* -bI: provide information, of the type to follow after a colon.
2477 This is an Exim flag. */
2479 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2481 const uschar * p = argrest+1;
2482 info_flag = CMDINFO_HELP;
2484 if (strcmpic(p, CUS"sieve") == 0)
2486 info_flag = CMDINFO_SIEVE;
2489 else if (strcmpic(p, CUS"dscp") == 0)
2491 info_flag = CMDINFO_DSCP;
2494 else if (strcmpic(p, CUS"help") == 0)
2500 /* -bm: Accept and deliver message - the default option. Reinstate
2501 receiving_message, which got turned off for all -b options.
2502 -bmalware: test the filename given for malware */
2504 if (!*argrest) receiving_message = TRUE;
2505 else if (Ustrcmp(argrest, "alware") == 0)
2507 if (++i >= argc) { badarg = TRUE; break; }
2509 malware_test_file = argv[i];
2514 /* -bnq: For locally originating messages, do not qualify unqualified
2515 addresses. In the envelope, this causes errors; in header lines they
2518 if (Ustrcmp(argrest, "q") == 0)
2520 f.allow_unqualified_sender = FALSE;
2521 f.allow_unqualified_recipient = FALSE;
2526 /* -bpxx: List the contents of the mail queue, in various forms. If
2527 the option is -bpc, just a queue count is needed. Otherwise, if the
2528 first letter after p is r, then order is random. */
2530 if (*argrest == 'c')
2533 if (*++argrest) badarg = TRUE;
2537 if (*argrest == 'r')
2538 list_queue_option = QL_UNSORTED, argrest++;
2540 list_queue_option = QL_BASIC;
2544 /* -bp: List the contents of the mail queue, top-level only */
2548 /* -bpu: List the contents of the mail queue, top-level undelivered */
2550 else if (Ustrcmp(argrest, "u") == 0) list_queue_option |= QL_UNDELIVERED_ONLY;
2552 /* -bpa: List the contents of the mail queue, including all delivered */
2554 else if (Ustrcmp(argrest, "a") == 0) list_queue_option |= QL_PLUS_GENERATED;
2556 /* -bpi: List only message IDs */
2558 else if (Ustrcmp(argrest, "i") == 0) list_queue_option |= QL_MSGID_ONLY;
2560 /* Unknown after -bp[r] */
2566 /* -bP: List the configuration variables given as the address list.
2567 Force -v, so configuration errors get displayed. */
2570 /* -bP config: we need to setup here, because later,
2571 when list_options is checked, the config is read already */
2574 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2577 readconf_save_config(version_string);
2581 list_options = TRUE;
2582 debug_selector |= D_v;
2583 debug_file = stderr;
2587 /* -brt: Test retry configuration lookup */
2589 if (Ustrcmp(argrest, "t") == 0)
2592 test_retry_arg = i + 1;
2596 /* -brw: Test rewrite configuration */
2598 else if (Ustrcmp(argrest, "w") == 0)
2601 test_rewrite_arg = i + 1;
2607 /* -bS: Read SMTP commands on standard input, but produce no replies -
2608 all errors are reported by sending messages. */
2611 smtp_input = smtp_batched_input = receiving_message = TRUE;
2615 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2616 on standard output. */
2618 if (!*argrest) smtp_input = receiving_message = TRUE;
2622 /* -bt: address testing mode */
2625 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2629 /* -bv: verify addresses */
2632 verify_address_mode = checking = f.log_testing_mode = TRUE;
2634 /* -bvs: verify sender addresses */
2636 else if (Ustrcmp(argrest, "s") == 0)
2638 verify_address_mode = checking = f.log_testing_mode = TRUE;
2639 verify_as_sender = TRUE;
2644 /* -bV: Print version string and support details */
2648 printf("Exim version %s #%s built %s\n", version_string,
2649 version_cnumber, version_date);
2650 printf("%s\n", CS version_copyright);
2651 version_printed = TRUE;
2652 show_whats_supported(TRUE);
2653 f.log_testing_mode = TRUE;
2658 /* -bw: inetd wait mode, accept a listening socket as stdin */
2660 f.inetd_wait_mode = TRUE;
2661 f.background_daemon = FALSE;
2662 f.daemon_listen = f.daemon_scion = TRUE;
2664 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2665 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2676 /* -C: change configuration file list; ignore if it isn't really
2677 a change! Enforce a prefix check if required. */
2681 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2682 if (Ustrcmp(config_main_filelist, argrest) != 0)
2684 #ifdef ALT_CONFIG_PREFIX
2686 int len = Ustrlen(ALT_CONFIG_PREFIX);
2687 const uschar *list = argrest;
2689 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2690 while((filename = string_nextinlist(&list, &sep, big_buffer,
2692 if ( ( Ustrlen(filename) < len
2693 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2694 || Ustrstr(filename, "/../") != NULL
2696 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2698 exim_fail("-C Permission denied\n");
2700 if (real_uid != root_uid)
2702 #ifdef TRUSTED_CONFIG_LIST
2704 if (real_uid != exim_uid
2705 #ifdef CONFIGURE_OWNER
2706 && real_uid != config_uid
2709 f.trusted_config = FALSE;
2712 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2715 struct stat statbuf;
2717 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2718 (statbuf.st_uid != root_uid /* owner not root */
2719 #ifdef CONFIGURE_OWNER
2720 && statbuf.st_uid != config_uid /* owner not the special one */
2723 (statbuf.st_gid != root_gid /* group not root */
2724 #ifdef CONFIGURE_GROUP
2725 && statbuf.st_gid != config_gid /* group not the special one */
2727 && (statbuf.st_mode & 020) != 0 /* group writeable */
2729 (statbuf.st_mode & 2) != 0) /* world writeable */
2731 f.trusted_config = FALSE;
2736 /* Well, the trust list at least is up to scratch... */
2738 uschar *trusted_configs[32];
2741 int old_pool = store_pool;
2742 store_pool = POOL_MAIN;
2744 reset_point = store_mark();
2745 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2747 uschar * start = big_buffer, * nl;
2748 if (Uskip_whitespace(&start) != '/')
2750 if ((nl = Ustrchr(start, '\n')))
2752 trusted_configs[nr_configs++] = string_copy(start);
2753 if (nr_configs == nelem(trusted_configs))
2761 const uschar *list = argrest;
2763 while (f.trusted_config && (filename = string_nextinlist(&list,
2764 &sep, big_buffer, big_buffer_size)))
2766 for (i=0; i < nr_configs; i++)
2767 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2769 if (i == nr_configs)
2771 f.trusted_config = FALSE;
2776 else /* No valid prefixes found in trust_list file. */
2777 f.trusted_config = FALSE;
2778 store_reset(reset_point);
2779 store_pool = old_pool;
2782 else /* Could not open trust_list file. */
2783 f.trusted_config = FALSE;
2786 /* Not root; don't trust config */
2787 f.trusted_config = FALSE;
2791 config_main_filelist = argrest;
2792 f.config_changed = TRUE;
2797 /* -D: set up a macro definition */
2800 #ifdef DISABLE_D_OPTION
2801 exim_fail("exim: -D is not available in this Exim binary\n");
2807 const uschar * s = argrest;
2810 Uskip_whitespace(&s);
2812 if (*s < 'A' || *s > 'Z')
2813 exim_fail("exim: macro name set by -D must start with "
2814 "an upper case letter\n");
2816 while (isalnum(*s) || *s == '_')
2818 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2822 if (ptr == 0) { badarg = TRUE; break; }
2823 if (Uskip_whitespace(&s))
2825 if (*s++ != '=') { badarg = TRUE; break; }
2826 Uskip_whitespace(&s);
2829 for (m = macros_user; m; m = m->next)
2830 if (Ustrcmp(m->name, name) == 0)
2831 exim_fail("exim: duplicated -D in command line\n");
2833 m = macro_create(name, s, TRUE);
2835 if (clmacro_count >= MAX_CLMACROS)
2836 exim_fail("exim: too many -D options on command line\n");
2837 clmacros[clmacro_count++] =
2838 string_sprintf("-D%s=%s", m->name, m->replacement);
2845 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2847 if (Ustrcmp(argrest, "ropcr") == 0)
2849 /* drop_cr = TRUE; */
2852 /* -dp: Set up a debug pretrigger buffer with given size. */
2854 else if (Ustrcmp(argrest, "p") == 0)
2858 debug_pretrigger_setup(argv[i]);
2860 /* -dt: Set a debug trigger selector */
2862 else if (Ustrncmp(argrest, "t=", 2) == 0)
2863 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2865 /* -d: Set debug level (see also -v below).
2866 If -dd is used, debugging subprocesses of the daemon is disabled. */
2870 /* Use an intermediate variable so that we don't set debugging while
2871 decoding the debugging bits. */
2873 unsigned int selector = D_default;
2876 if (*argrest == 'd')
2878 f.debug_daemon = TRUE;
2882 decode_bits(&selector, 1, debug_notall, argrest,
2883 debug_options, debug_options_count, US"debug", 0);
2884 debug_selector = selector;
2889 /* -E: This is a local error message. This option is not intended for
2890 external use at all, but is not restricted to trusted callers because it
2891 does no harm (just suppresses certain error messages) and if Exim is run
2892 not setuid root it won't always be trusted when it generates error
2893 messages using this option. If there is a message id following -E, point
2894 message_reference at it, for logging. */
2897 f.local_error_message = TRUE;
2898 if (mac_ismsgid(argrest)) message_reference = argrest;
2902 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2903 option, so it looks as if historically the -oex options are also callable
2904 without the leading -o. So we have to accept them. Before the switch,
2905 anything starting -oe has been converted to -e. Exim does not support all
2906 of the sendmail error options. */
2909 if (Ustrcmp(argrest, "e") == 0)
2911 arg_error_handling = ERRORS_SENDER;
2912 errors_sender_rc = EXIT_SUCCESS;
2914 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2915 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2916 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2917 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2922 /* -F: Set sender's full name, used instead of the gecos entry from
2923 the password file. Since users can usually alter their gecos entries,
2924 there's no security involved in using this instead. The data can follow
2925 the -F or be in the next argument. */
2929 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2930 originator_name = string_copy_taint(
2931 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2933 f.sender_name_forced = TRUE;
2937 /* -f: Set sender's address - this value is only actually used if Exim is
2938 run by a trusted user, or if untrusted_set_sender is set and matches the
2939 address, except that the null address can always be set by any user. The
2940 test for this happens later, when the value given here is ignored when not
2941 permitted. For an untrusted user, the actual sender is still put in Sender:
2942 if it doesn't match the From: header (unless no_local_from_check is set).
2943 The data can follow the -f or be in the next argument. The -r switch is an
2944 obsolete form of -f but since there appear to be programs out there that
2945 use anything that sendmail has ever supported, better accept it - the
2946 synonymizing is done before the switch above.
2948 At this stage, we must allow domain literal addresses, because we don't
2949 know what the setting of allow_domain_literals is yet. Ditto for trailing
2950 dots and strip_trailing_dot. */
2954 int dummy_start, dummy_end;
2957 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2958 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2961 uschar * s = store_get(1, GET_UNTAINTED); /* Ensure writeable memory */
2967 const uschar * temp = argrest + Ustrlen(argrest) - 1;
2968 while (temp >= argrest && isspace(*temp)) temp--;
2969 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2970 allow_domain_literals = TRUE;
2971 strip_trailing_dot = TRUE;
2973 allow_utf8_domains = TRUE;
2975 if (!(sender_address = parse_extract_address(argrest, &errmess,
2976 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2977 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2979 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2981 message_smtputf8 = string_is_utf8(sender_address);
2982 allow_utf8_domains = FALSE;
2984 allow_domain_literals = FALSE;
2985 strip_trailing_dot = FALSE;
2987 f.sender_address_forced = TRUE;
2991 /* -G: sendmail invocation to specify that it's a gateway submission and
2992 sendmail may complain about problems instead of fixing them.
2993 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2994 not at this time complain about problems. */
3000 /* -h: Set the hop count for an incoming message. Exim does not currently
3001 support this; it always computes it by counting the Received: headers.
3002 To put it in will require a change to the spool header file format. */
3006 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3007 if (!isdigit(*argrest)) badarg = TRUE;
3011 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
3012 not to be documented for sendmail but mailx (at least) uses it) */
3015 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
3019 /* -L: set the identifier used for syslog; equivalent to setting
3020 syslog_processname in the config file, but needs to be an admin option. */
3024 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3025 if ((sz = Ustrlen(argrest)) > 32)
3026 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
3028 exim_fail("exim: the -L syslog name is too short\n");
3029 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
3033 receiving_message = FALSE;
3035 /* -MC: continue delivery of another message via an existing open
3036 file descriptor. This option is used for an internal call by the
3037 smtp transport when there is a pending message waiting to go to an
3038 address to which it has got a connection. Five subsequent arguments are
3039 required: transport name, host name, IP address, sequence number, and
3040 message_id. Transports may decline to create new processes if the sequence
3041 number gets too big. The channel is stdin. This (-MC) must be the last
3042 argument. There's a subsequent check that the real-uid is privileged.
3044 If we are running in the test harness. delay for a bit, to let the process
3045 that set this one up complete. This makes for repeatability of the logging,
3048 if (Ustrcmp(argrest, "C") == 0)
3050 union sockaddr_46 interface_sock;
3051 EXIM_SOCKLEN_T size = sizeof(interface_sock);
3054 exim_fail("exim: too many or too few arguments after -MC\n");
3056 if (msg_action_arg >= 0)
3057 exim_fail("exim: incompatible arguments\n");
3059 continue_transport = string_copy_taint(
3060 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
3062 continue_hostname = string_copy_taint(
3063 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
3065 continue_host_address = string_copy_taint(
3066 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
3068 continue_sequence = Uatoi(argv[++i]);
3069 msg_action = MSG_DELIVER;
3070 msg_action_arg = ++i;
3071 forced_delivery = TRUE;
3072 queue_run_pid = passed_qr_pid;
3073 queue_run_pipe = passed_qr_pipe;
3075 if (!mac_ismsgid(argv[i]))
3076 exim_fail("exim: malformed message id %s after -MC option\n",
3079 /* Set up $sending_ip_address and $sending_port, unless proxied */
3081 if (!continue_proxy_cipher)
3082 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
3084 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
3087 exim_fail("exim: getsockname() failed after -MC option: %s\n",
3090 testharness_pause_ms(500);
3094 else if (*argrest == 'C' && argrest[1] && !argrest[2])
3098 /* -MCA: set the smtp_authenticated flag; this is useful only when it
3099 precedes -MC (see above). The flag indicates that the host to which
3100 Exim is connected has accepted an AUTH sequence. */
3102 case 'A': f.smtp_authenticated = TRUE; break;
3104 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
3105 that exim is connected to supports the esmtp extension DSN */
3107 case 'D': smtp_peer_options |= OPTION_DSN; break;
3109 /* -MCd: for debug, set a process-purpose string */
3111 case 'd': if (++i < argc)
3112 process_purpose = string_copy_taint(
3113 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
3118 /* -MCG: set the queue name, to a non-default value. Arguably, anything
3119 from the commandline should be tainted - but we will need an untainted
3120 value for the spoolfile when doing a -odi delivery process. */
3122 case 'G': if (++i < argc) queue_name = string_copy_taint(
3123 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
3128 /* -MCK: the peer offered CHUNKING. Must precede -MC */
3130 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
3132 #ifndef DISABLE_ESMTP_LIMITS
3133 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
3134 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
3136 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
3138 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
3143 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
3144 it preceded -MC (see above) */
3146 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3148 #ifdef SUPPORT_SOCKS
3149 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3150 case 'p': proxy_session = TRUE;
3153 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3156 proxy_local_port = Uatoi(argv[i]);
3159 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3162 proxy_external_port = Uatoi(argv[i]);
3168 /* -MCQ: pass on the pid of the queue-running process that started
3169 this chain of deliveries and the fd of its synchronizing pipe; this
3170 is useful only when it precedes -MC (see above) */
3172 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3174 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3178 /* -MCq: do a quota check on the given recipient for the given size
3179 of message. Separate from -MC. */
3180 case 'q': rcpt_verify_quota = TRUE;
3181 if (++i < argc) message_size = Uatoi(argv[i]);
3185 /* -MCS: set the smtp_use_size flag; this is useful only when it
3186 precedes -MC (see above) */
3188 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3191 /* -MCs: used with -MCt; SNI was sent */
3192 /* -MCr: ditto, DANE */
3195 case 's': if (++i < argc)
3197 continue_proxy_sni = string_copy_taint(
3198 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3200 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3205 /* -MCt: similar to -MCT below but the connection is still open
3206 via a proxy process which handles the TLS context and coding.
3207 Require three arguments for the proxied local address and port,
3208 and the TLS cipher. */
3210 case 't': if (++i < argc)
3211 sending_ip_address = string_copy_taint(
3212 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3216 sending_port = (int)(Uatol(argv[i]));
3219 continue_proxy_cipher = string_copy_taint(
3220 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3225 /* -MCT: set the tls_offered flag; this is useful only when it
3226 precedes -MC (see above). The flag indicates that the host to which
3227 Exim is connected has offered TLS support. */
3229 case 'T': smtp_peer_options |= OPTION_TLS; break;
3232 default: badarg = TRUE; break;
3237 /* -M[x]: various operations on the following list of message ids:
3238 -M deliver the messages, ignoring next retry times and thawing
3239 -Mc deliver the messages, checking next retry times, no thawing
3240 -Mf freeze the messages
3241 -Mg give up on the messages
3242 -Mt thaw the messages
3243 -Mrm remove the messages
3244 In the above cases, this must be the last option. There are also the
3245 following options which are followed by a single message id, and which
3246 act on that message. Some of them use the "recipient" addresses as well.
3247 -Mar add recipient(s)
3248 -MG move to a different queue
3249 -Mmad mark all recipients delivered
3250 -Mmd mark recipients(s) delivered
3252 -Mset load a message for use with -be
3254 -Mvc show copy (of whole message, in RFC 2822 format)
3261 msg_action = MSG_DELIVER;
3262 forced_delivery = f.deliver_force_thaw = TRUE;
3264 else if (Ustrcmp(argrest, "ar") == 0)
3266 msg_action = MSG_ADD_RECIPIENT;
3267 one_msg_action = TRUE;
3269 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3270 else if (Ustrcmp(argrest, "es") == 0)
3272 msg_action = MSG_EDIT_SENDER;
3273 one_msg_action = TRUE;
3275 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3276 else if (Ustrcmp(argrest, "g") == 0)
3278 msg_action = MSG_DELIVER;
3279 deliver_give_up = TRUE;
3281 else if (Ustrcmp(argrest, "G") == 0)
3283 msg_action = MSG_SETQUEUE;
3284 queue_name_dest = string_copy_taint(
3285 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3286 EXIM_DRIVERNAME_MAX, "-MG"),
3289 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3290 else if (Ustrcmp(argrest, "md") == 0)
3292 msg_action = MSG_MARK_DELIVERED;
3293 one_msg_action = TRUE;
3295 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3296 else if (Ustrcmp(argrest, "set") == 0)
3298 msg_action = MSG_LOAD;
3299 one_msg_action = TRUE;
3301 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3302 else if (Ustrcmp(argrest, "vb") == 0)
3304 msg_action = MSG_SHOW_BODY;
3305 one_msg_action = TRUE;
3307 else if (Ustrcmp(argrest, "vc") == 0)
3309 msg_action = MSG_SHOW_COPY;
3310 one_msg_action = TRUE;
3312 else if (Ustrcmp(argrest, "vh") == 0)
3314 msg_action = MSG_SHOW_HEADER;
3315 one_msg_action = TRUE;
3317 else if (Ustrcmp(argrest, "vl") == 0)
3319 msg_action = MSG_SHOW_LOG;
3320 one_msg_action = TRUE;
3322 else { badarg = TRUE; break; }
3324 /* All the -Mxx options require at least one message id. */
3326 msg_action_arg = i + 1;
3327 if (msg_action_arg >= argc)
3328 exim_fail("exim: no message ids given after %s option\n", arg);
3330 /* Some require only message ids to follow */
3332 if (!one_msg_action)
3334 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3335 exim_fail("exim: malformed message id %s after %s option\n",
3337 goto END_ARG; /* Remaining args are ids */
3340 /* Others require only one message id, possibly followed by addresses,
3341 which will be handled as normal arguments. */
3345 if (!mac_ismsgid(argv[msg_action_arg]))
3346 exim_fail("exim: malformed message id %s after %s option\n",
3347 argv[msg_action_arg], arg);
3353 /* Some programs seem to call the -om option without the leading o;
3354 for sendmail it askes for "me too". Exim always does this. */
3357 if (*argrest) badarg = TRUE;
3361 /* -N: don't do delivery - a debugging option that stops transports doing
3362 their thing. It implies debugging at the D_v level. */
3367 f.dont_deliver = TRUE;
3368 debug_selector |= D_v;
3369 debug_file = stderr;
3375 /* -n: This means "don't alias" in sendmail, apparently.
3376 For normal invocations, it has no effect.
3377 It may affect some other options. */
3383 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3384 option to the specified value. This form uses long names. We need to handle
3385 -O option=value and -Ooption=value. */
3390 exim_fail("exim: string expected after -O\n");
3396 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3399 if (!*(alias_arg = argrest))
3400 if (i+1 < argc) alias_arg = argv[++i];
3401 else exim_fail("exim: string expected after -oA\n");
3404 /* -oB: Set a connection message max value for remote deliveries */
3407 const uschar * p = argrest;
3409 if (i+1 < argc && isdigit((argv[i+1][0])))
3413 connection_max_messages = 1;
3420 exim_fail("exim: number expected after -oB\n");
3421 connection_max_messages = Uatoi(p);
3426 /* -odb: background delivery */
3429 if (Ustrcmp(argrest, "b") == 0)
3431 f.synchronous_delivery = FALSE;
3432 arg_queue_only = FALSE;
3433 queue_only_set = TRUE;
3436 /* -odd: testsuite-only: add no inter-process delays */
3438 else if (Ustrcmp(argrest, "d") == 0)
3439 f.testsuite_delays = FALSE;
3441 /* -odf: foreground delivery (smail-compatible option); same effect as
3442 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3445 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3447 f.synchronous_delivery = TRUE;
3448 arg_queue_only = FALSE;
3449 queue_only_set = TRUE;
3452 /* -odq: queue only */
3454 else if (Ustrcmp(argrest, "q") == 0)
3456 f.synchronous_delivery = FALSE;
3457 arg_queue_only = TRUE;
3458 queue_only_set = TRUE;
3461 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3462 but no remote delivery */
3464 else if (Ustrcmp(argrest, "qs") == 0)
3466 f.queue_smtp = TRUE;
3467 arg_queue_only = FALSE;
3468 queue_only_set = TRUE;
3473 /* -oex: Sendmail error flags. As these are also accepted without the
3474 leading -o prefix, for compatibility with vacation and other callers,
3475 they are handled with -e above. */
3477 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3478 -oitrue: Another sendmail syntax for the same */
3481 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3486 /* -oM*: Set various characteristics for an incoming message; actually
3487 acted on for trusted callers only. */
3492 exim_fail("exim: data expected after -oM%s\n", argrest);
3494 /* -oMa: Set sender host address */
3496 if (Ustrcmp(argrest, "a") == 0)
3497 sender_host_address = string_copy_taint(
3498 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3499 EXIM_IPADDR_MAX, "-oMa"), GET_TAINTED);
3501 /* -oMaa: Set authenticator name */
3503 else if (Ustrcmp(argrest, "aa") == 0)
3504 sender_host_authenticated = string_copy_taint(
3505 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3506 EXIM_DRIVERNAME_MAX, "-oMaa"), GET_TAINTED);
3508 /* -oMas: setting authenticated sender */
3510 else if (Ustrcmp(argrest, "as") == 0)
3511 authenticated_sender = string_copy_taint(
3512 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3513 EXIM_EMAILADDR_MAX, "-oMas"), GET_TAINTED);
3515 /* -oMai: setting authenticated id */
3517 else if (Ustrcmp(argrest, "ai") == 0)
3518 authenticated_id = string_copy_taint(
3519 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3520 EXIM_EMAILADDR_MAX, "-oMai"), GET_TAINTED);
3522 /* -oMi: Set incoming interface address */
3524 else if (Ustrcmp(argrest, "i") == 0)
3525 interface_address = string_copy_taint(
3526 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3527 EXIM_IPADDR_MAX, "-oMi"), GET_TAINTED);
3529 /* -oMm: Message reference */
3531 else if (Ustrcmp(argrest, "m") == 0)
3533 if (!mac_ismsgid(argv[i+1]))
3534 exim_fail("-oMm must be a valid message ID\n");
3535 if (!f.trusted_config)
3536 exim_fail("-oMm must be called by a trusted user/config\n");
3537 message_reference = next_argv(argv, &i, argc, arg);
3540 /* -oMr: Received protocol */
3542 else if (Ustrcmp(argrest, "r") == 0)
3544 if (received_protocol)
3545 exim_fail("received_protocol is set already\n");
3547 if (++i >= argc) badarg = TRUE;
3549 received_protocol = string_copy_taint(
3550 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-oMr"),
3553 /* -oMs: Set sender host name */
3555 else if (Ustrcmp(argrest, "s") == 0)
3556 if (++i >= argc) badarg = TRUE;
3558 sender_host_name = string_copy_taint(
3559 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-oMs"),
3562 /* -oMt: Set sender ident */
3564 else if (Ustrcmp(argrest, "t") == 0)
3565 if (++i >= argc) badarg = TRUE;
3568 sender_ident_set = TRUE;
3569 sender_ident = string_copy_taint(
3570 exim_str_fail_toolong(argv[i], EXIM_IDENTUSER_MAX, "-oMt"),
3574 /* Else a bad argument */
3581 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3582 seem to call this as -m (undocumented), so that is also accepted (see
3584 /* -oo: An ancient flag for old-style addresses which still seems to
3585 crop up in some calls (see in SCO). */
3589 if (*argrest) badarg = TRUE;
3592 /* -oP <name>: set pid file path for daemon
3593 -oPX: delete pid file of daemon */
3596 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3597 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3598 "(uid=%d euid=%d | %d)\n",
3599 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3601 if (++i < argc) override_pid_file_path = argv[i];
3603 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3608 /* -or <n>: set timeout for non-SMTP acceptance
3609 -os <n>: set timeout for SMTP acceptance */
3614 int * tp = argrest[-1] == 'r'
3615 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3617 *tp = readconf_readtime(argrest, 0, FALSE);
3618 else if (i+1 < argc)
3619 *tp = readconf_readtime(argv[++i], 0, FALSE);
3622 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3626 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3627 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3630 if (*argrest || ++i >= argc) badarg = TRUE;
3631 else override_local_interfaces = string_copy_taint(
3632 exim_str_fail_toolong(argv[i], 1024, "-oX"), GET_TAINTED);
3635 /* -oY: Override creation of daemon notifier socket */
3638 if (*argrest) badarg = TRUE;
3639 else f.notifier_socket_en = FALSE;
3642 /* Unknown -o argument */
3650 /* -ps: force Perl startup; -pd force delayed Perl startup */
3654 if (*argrest == 's' && argrest[1] == 0)
3656 perl_start_option = 1;
3659 if (*argrest == 'd' && argrest[1] == 0)
3661 perl_start_option = -1;
3666 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3667 which sets the host protocol and host name */
3670 argrest = next_argv(argv, &i, argc, arg);
3674 uschar * hn = Ustrchr(argrest, ':');
3676 if (received_protocol)
3677 exim_fail("received_protocol is set already\n");
3680 received_protocol = string_copy_taint(
3681 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3685 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3686 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3687 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3692 /* -q: set up queue runs */
3696 BOOL two_stage, first_del, force, thaw = FALSE, local;
3698 receiving_message = FALSE;
3700 /* -qq...: Do queue runs in a 2-stage manner */
3702 if ((two_stage = *argrest == 'q'))
3705 /* -qi...: Do only first (initial) deliveries */
3707 if ((first_del = *argrest == 'i'))
3710 /* -qf...: Run the queue, forcing deliveries
3711 -qff..: Ditto, forcing thawing as well */
3713 if ((force = *argrest == 'f'))
3714 if ((thaw = *++argrest == 'f'))
3717 /* -q[f][f]l...: Run the queue only on local deliveries */
3719 if ((local = *argrest == 'l'))
3722 /* -q[f][f][l][G<name>]... Work on the named queue */
3724 if (*argrest == 'G')
3727 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3728 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3729 queue_name = string_copyn(argrest, i);
3731 if (*argrest == '/') argrest++;
3734 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3735 only, optionally named, optionally starting from a given message id. */
3737 if (!(list_queue || count_queue))
3742 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3744 q = alloc_onetime_qrunner();
3745 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3746 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3747 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3748 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3751 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3752 forced, optionally local only, optionally named. */
3759 if (*argrest) s = argrest;
3760 else if (++i < argc) { badarg = TRUE; break; }
3763 if ((intvl = readconf_readtime(s, 0, FALSE)) <= 0)
3764 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3766 for (qrunner * qq = qrunners; qq; qq = qq->next)
3767 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3768 || !queue_name && !qq->name)
3769 exim_fail("exim: queue-runner specified more than once\n");
3771 q = alloc_qrunner();
3772 q->interval = intvl;
3775 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3776 q->queue_run_force = force;
3777 q->deliver_force_thaw = thaw;
3778 q->queue_run_first_delivery = first_del;
3779 q->queue_run_local = local;
3780 q->queue_2stage = two_stage;
3787 case 'R': /* Synonymous with -qR... */
3788 case 'S': /* Synonymous with -qS... */
3790 const uschar * tainted_selectstr;
3793 receiving_message = FALSE;
3795 /* -Rf: As -R (below) but force all deliveries,
3796 -Rff: Ditto, but also thaw all frozen messages,
3797 -Rr: String is regex
3798 -Rrf: Regex and force
3799 -Rrff: Regex and force and thaw
3801 -S...: Like -R but works on sender.
3803 in all cases provided there are no further characters in this
3806 if (!qrunners) alloc_onetime_qrunner();
3807 qrunners->queue_2stage = f.queue_2stage;
3809 for (int i = 0; i < nelem(rsopts); i++)
3810 if (Ustrcmp(argrest, rsopts[i]) == 0)
3812 if (i != 2) qrunners->queue_run_force = TRUE;
3814 if (switchchar == 'R')
3815 f.deliver_selectstring_regex = TRUE;
3817 f.deliver_selectstring_sender_regex = TRUE;
3818 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3819 argrest += Ustrlen(rsopts[i]);
3822 /* -R or -S: Set string to match in addresses for forced queue run to
3823 pick out particular messages. */
3825 /* Avoid attacks from people providing very long strings, and do so before
3828 tainted_selectstr = argrest;
3829 else if (i+1 < argc)
3830 tainted_selectstr = argv[++i];
3832 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3834 s = string_copy_taint(
3835 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3838 if (switchchar == 'R')
3839 deliver_selectstring = s;
3841 deliver_selectstring_sender = s;
3846 /* -r: an obsolete synonym for -f (see above) */
3848 /* -Tqt is an option that is exclusively for use by the testing suite.
3849 It is not recognized in other circumstances. It allows for the setting up
3850 of explicit "queue times" so that various warning/retry things can be
3851 tested. Otherwise variability of clock ticks etc. cause problems. */
3854 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0 && ++i < argc)
3855 fudged_queue_times = string_copy_taint(argv[i], GET_TAINTED);
3860 /* -t: Set flag to extract recipients from body of message. */
3863 if (!*argrest) extract_recipients = TRUE;
3865 /* -ti: Set flag to extract recipients from body of message, and also
3866 specify that dot does not end the message. */
3868 else if (Ustrcmp(argrest, "i") == 0)
3870 extract_recipients = TRUE;
3874 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3877 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3884 /* -U: This means "initial user submission" in sendmail, apparently. The
3885 doc claims that in future sendmail may refuse syntactically invalid
3886 messages instead of fixing them. For the moment, we just ignore it. */
3892 /* -v: verify things - this is a very low-level debugging */
3897 debug_selector |= D_v;
3898 debug_file = stderr;
3904 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3906 The -x flag tells the sendmail command that mail from a local
3907 mail program has National Language Support (NLS) extended characters
3908 in the body of the mail item. The sendmail command can send mail with
3909 extended NLS characters across networks that normally corrupts these
3912 As Exim is 8-bit clean, it just ignores this flag. */
3915 if (*argrest) badarg = TRUE;
3918 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3919 logs to that file. We swallow the parameter and otherwise ignore it. */
3924 exim_fail("exim: string expected after -X\n");
3927 /* -z: a line of text to log */
3932 log_oneline = string_copy_taint(
3933 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3936 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3939 /* All other initial characters are errors */
3944 } /* End of high-level switch statement */
3946 /* Failed to recognize the option, or syntax error */
3949 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3950 "option %s\n", arg);
3954 /* If -R or -S have been specified without -q, assume a single queue run. */
3956 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3957 alloc_onetime_qrunner();
3961 store_pool = old_pool;
3964 /* If usage_wanted is set we call the usage function - which never returns */
3965 if (usage_wanted) exim_usage(called_as);
3967 /* Arguments have been processed. Check for incompatibilities. */
3968 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3969 && ( f.daemon_listen || qrunners || bi_option
3970 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3971 || filter_test != FTEST_NONE
3972 || msg_action_arg > 0 && !one_msg_action
3974 || ( msg_action_arg > 0
3975 && ( f.daemon_listen || is_multiple_qrun() || list_options
3976 || checking && msg_action != MSG_LOAD
3977 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3979 || ( (f.daemon_listen || is_multiple_qrun())
3980 && ( sender_address || list_options || list_queue || checking
3983 || f.daemon_listen && is_onetime_qrun()
3984 || f.inetd_wait_mode && qrunners
3986 && ( checking || smtp_input || extract_recipients
3987 || filter_test != FTEST_NONE || bi_option
3989 || ( verify_address_mode
3990 && ( f.address_test_mode || smtp_input || extract_recipients
3991 || filter_test != FTEST_NONE || bi_option
3993 || ( f.address_test_mode
3994 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3998 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
4000 || deliver_selectstring && !qrunners
4001 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
4003 exim_fail("exim: incompatible command-line options or arguments\n");
4005 /* If debugging is set up, set the file and the file descriptor to pass on to
4006 child processes. It should, of course, be 2 for stderr. Also, force the daemon
4007 to run in the foreground. */
4009 if (debug_selector != 0)
4011 debug_file = stderr;
4012 debug_fd = fileno(debug_file);
4013 f.background_daemon = FALSE;
4014 testharness_pause_ms(100); /* lets caller finish */
4015 if (debug_selector != D_v) /* -v only doesn't show this */
4017 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
4018 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
4020 if (!version_printed)
4021 show_whats_supported(FALSE);
4025 /* When started with root privilege, ensure that the limits on the number of
4026 open files and the number of processes (where that is accessible) are
4027 sufficiently large, or are unset, in case Exim has been called from an
4028 environment where the limits are screwed down. Not all OS have the ability to
4029 change some of these limits. */
4033 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
4039 #ifdef RLIMIT_NOFILE
4040 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
4042 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
4044 rlp.rlim_cur = rlp.rlim_max = 0;
4047 /* I originally chose 1000 as a nice big number that was unlikely to
4048 be exceeded. It turns out that some older OS have a fixed upper limit of
4051 if (rlp.rlim_cur < 1000)
4053 rlp.rlim_cur = rlp.rlim_max = 1000;
4054 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4056 rlp.rlim_cur = rlp.rlim_max = 256;
4057 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4058 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
4065 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
4067 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
4069 rlp.rlim_cur = rlp.rlim_max = 0;
4072 # ifdef RLIM_INFINITY
4073 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
4075 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
4077 if (rlp.rlim_cur < 1000)
4079 rlp.rlim_cur = rlp.rlim_max = 1000;
4081 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
4082 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
4088 /* Exim is normally entered as root (but some special configurations are
4089 possible that don't do this). However, it always spins off sub-processes that
4090 set their uid and gid as required for local delivery. We don't want to pass on
4091 any extra groups that root may belong to, so we want to get rid of them all at
4094 We need to obey setgroups() at this stage, before possibly giving up root
4095 privilege for a changed configuration file, but later on we might need to
4096 check on the additional groups for the admin user privilege - can't do that
4097 till after reading the config, which might specify the exim gid. Therefore,
4098 save the group list here first. */
4100 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
4101 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
4103 /* There is a fundamental difference in some BSD systems in the matter of
4104 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
4105 known not to be different. On the "different" systems there is a single group
4106 list, and the first entry in it is the current group. On all other versions of
4107 Unix there is a supplementary group list, which is in *addition* to the current
4108 group. Consequently, to get rid of all extraneous groups on a "standard" system
4109 you pass over 0 groups to setgroups(), while on a "different" system you pass
4110 over a single group - the current group, which is always the first group in the
4111 list. Calling setgroups() with zero groups on a "different" system results in
4112 an error return. The following code should cope with both types of system.
4114 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
4115 the "setgroups() with zero groups" - and changes the egid.
4116 Thanks to that we had to stash the original_egid above, for use below
4117 in the call to exim_setugid().
4119 However, if this process isn't running as root, setgroups() can't be used
4120 since you have to be root to run it, even if throwing away groups.
4121 Except, sigh, for Hurd - where you can.
4122 Not being root here happens only in some unusual configurations. */
4125 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
4126 && setgroups(0, NULL) != 0
4128 && setgroups(1, group_list) != 0)
4129 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
4131 /* If the configuration file name has been altered by an argument on the
4132 command line (either a new file name or a macro definition) and the caller is
4133 not root, or if this is a filter testing run, remove any setuid privilege the
4134 program has and run as the underlying user.
4136 The exim user is locked out of this, which severely restricts the use of -C
4139 Otherwise, set the real ids to the effective values (should be root unless run
4140 from inetd, which it can either be root or the exim uid, if one is configured).
4142 There is a private mechanism for bypassing some of this, in order to make it
4143 possible to test lots of configurations automatically, without having either to
4144 recompile each time, or to patch in an actual configuration file name and other
4145 values (such as the path name). If running in the test harness, pretend that
4146 configuration file changes and macro definitions haven't happened. */
4149 (!f.trusted_config || /* Config changed, or */
4150 !macros_trusted(opt_D_used)) && /* impermissible macros and */
4151 real_uid != root_uid && /* Not root, and */
4152 !f.running_in_test_harness /* Not fudged */
4154 expansion_test /* expansion testing */
4156 filter_test != FTEST_NONE) /* Filter testing */
4158 setgroups(group_count, group_list);
4159 exim_setugid(real_uid, real_gid, FALSE,
4160 US"-C, -D, -be or -bf forces real uid");
4161 removed_privilege = TRUE;
4163 /* In the normal case when Exim is called like this, stderr is available
4164 and should be used for any logging information because attempts to write
4165 to the log will usually fail. To arrange this, we unset really_exim. However,
4166 if no stderr is available there is no point - we might as well have a go
4167 at the log (if it fails, syslog will be written).
4169 Note that if the invoker is Exim, the logs remain available. Messing with
4170 this causes unlogged successful deliveries. */
4172 if (log_stderr && real_uid != exim_uid)
4173 f.really_exim = FALSE;
4176 /* Privilege is to be retained for the moment. It may be dropped later,
4177 depending on the job that this Exim process has been asked to do. For now, set
4178 the real uid to the effective so that subsequent re-execs of Exim are done by a
4182 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4184 /* If testing a filter, open the file(s) now, before wasting time doing other
4185 setups and reading the message. */
4187 if (filter_test & FTEST_SYSTEM)
4188 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4189 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4192 if (filter_test & FTEST_USER)
4193 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4194 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4197 /* Initialise lookup_list
4198 If debugging, already called above via version reporting.
4199 In either case, we initialise the list of available lookups while running
4200 as root. All dynamically modules are loaded from a directory which is
4201 hard-coded into the binary and is code which, if not a module, would be
4202 part of Exim already. Ability to modify the content of the directory
4203 is equivalent to the ability to modify a setuid binary!
4205 This needs to happen before we read the main configuration. */
4208 /*XXX this excrescence could move to the testsuite standard config setup file */
4210 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4213 /* Read the main runtime configuration data; this gives up if there
4214 is a failure. It leaves the configuration file open so that the subsequent
4215 configuration data for delivery can be read if needed.
4217 NOTE: immediately after opening the configuration file we change the working
4218 directory to "/"! Later we change to $spool_directory. We do it there, because
4219 during readconf_main() some expansion takes place already. */
4221 /* Store the initial cwd before we change directories. Can be NULL if the
4222 dir has already been unlinked. */
4223 initial_cwd = os_getcwd(NULL, 0);
4224 if (!initial_cwd && errno)
4225 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4227 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4228 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4231 -be[m] expansion test -
4232 -b[fF] filter test new
4234 -bmalware malware_test_file new
4236 -brw rewrite test new
4238 -bv[s] address verify -
4240 -bP <option> (except -bP config, which sets list_config)
4242 If any of these options is set, we suppress warnings about configuration
4243 issues (currently about tls_advertise_hosts and keep_environment not being
4247 int old_pool = store_pool;
4248 #ifdef MEASURE_TIMING
4250 (void)gettimeofday(&t0, NULL);
4253 store_pool = POOL_CONFIG;
4254 readconf_main(checking || list_options);
4255 store_pool = old_pool;
4257 #ifdef MEASURE_TIMING
4258 report_time_since(&t0, US"readconf_main (delta)");
4262 /* Now in directory "/" */
4264 if (cleanup_environment() == FALSE)
4265 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4268 /* If an action on specific messages is requested, or if a daemon or queue
4269 runner is being started, we need to know if Exim was called by an admin user.
4270 This is the case if the real user is root or exim, or if the real group is
4271 exim, or if one of the supplementary groups is exim or a group listed in
4272 admin_groups. We don't fail all message actions immediately if not admin_user,
4273 since some actions can be performed by non-admin users. Instead, set admin_user
4274 for later interrogation. */
4276 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4277 f.admin_user = TRUE;
4279 for (int i = 0; i < group_count && !f.admin_user; i++)
4280 if (group_list[i] == exim_gid)
4281 f.admin_user = TRUE;
4282 else if (admin_groups)
4283 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4284 if (admin_groups[j] == group_list[i])
4285 f.admin_user = TRUE;
4287 /* Another group of privileged users are the trusted users. These are root,
4288 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4289 are permitted to specify sender_addresses with -f on the command line, and
4290 other message parameters as well. */
4292 if (real_uid == root_uid || real_uid == exim_uid)
4293 f.trusted_caller = TRUE;
4297 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4298 if (trusted_users[i] == real_uid)
4299 f.trusted_caller = TRUE;
4302 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4303 if (trusted_groups[i] == real_gid)
4304 f.trusted_caller = TRUE;
4305 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4306 if (trusted_groups[i] == group_list[j])
4307 f.trusted_caller = TRUE;
4310 /* At this point, we know if the user is privileged and some command-line
4311 options become possibly impermissible, depending upon the configuration file. */
4313 if (checking && commandline_checks_require_admin && !f.admin_user)
4314 exim_fail("exim: those command-line flags are set to require admin\n");
4316 /* Handle the decoding of logging options. */
4318 decode_bits(log_selector, log_selector_size, log_notall,
4319 log_selector_string, log_options, log_options_count, US"log", 0);
4323 debug_printf("configuration file is %s\n", config_main_filename);
4324 debug_printf("log selectors =");
4325 for (int i = 0; i < log_selector_size; i++)
4326 debug_printf(" %08x", log_selector[i]);
4330 /* If domain literals are not allowed, check the sender address that was
4331 supplied with -f. Ditto for a stripped trailing dot. */
4335 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4336 exim_fail("exim: bad -f address \"%s\": domain literals not "
4337 "allowed\n", sender_address);
4338 if (f_end_dot && !strip_trailing_dot)
4339 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4340 "(trailing dot not allowed)\n", sender_address);
4343 /* See if an admin user overrode our logging. */
4345 if (cmdline_syslog_name)
4348 syslog_processname = cmdline_syslog_name;
4349 log_file_path = string_copy(CUS"syslog");
4352 /* not a panic, non-privileged users should not be able to spam paniclog */
4354 "exim: you lack sufficient privilege to specify syslog process name\n");
4356 /* Paranoia check of maximum lengths of certain strings. There is a check
4357 on the length of the log file path in log.c, which will come into effect
4358 if there are any calls to write the log earlier than this. However, if we
4359 get this far but the string is very long, it is better to stop now than to
4360 carry on and (e.g.) receive a message and then have to collapse. The call to
4361 log_write() from here will cause the ultimate panic collapse if the complete
4362 file name exceeds the buffer length. */
4364 if (Ustrlen(log_file_path) > 200)
4365 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4366 "log_file_path is longer than 200 chars: aborting");
4368 if (Ustrlen(pid_file_path) > 200)
4369 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4370 "pid_file_path is longer than 200 chars: aborting");
4372 if (Ustrlen(spool_directory) > 200)
4373 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4374 "spool_directory is longer than 200 chars: aborting");
4376 /* Length check on the process name given to syslog for its TAG field,
4377 which is only permitted to be 32 characters or less. See RFC 3164. */
4379 if (Ustrlen(syslog_processname) > 32)
4380 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4381 "syslog_processname is longer than 32 chars: aborting");
4386 log_write(0, LOG_MAIN, "%s", log_oneline);
4387 return EXIT_SUCCESS;
4390 return EXIT_FAILURE;
4392 /* In some operating systems, the environment variable TMPDIR controls where
4393 temporary files are created; Exim doesn't use these (apart from when delivering
4394 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4395 If TMPDIR is found in the environment, reset it to the value defined in the
4396 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4397 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4398 EXIM_TMPDIR by the build scripts.
4402 if (environ) for (uschar ** p = USS environ; *p; p++)
4403 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4405 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4406 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4408 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4412 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4413 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4414 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4415 called by a user who has set the TZ variable. This then affects the timestamps
4416 in log files and in Received: headers, and any created Date: header lines. The
4417 required timezone is settable in the configuration file, so nothing can be done
4418 about this earlier - but hopefully nothing will normally be logged earlier than
4419 this. We have to make a new environment if TZ is wrong, but don't bother if
4420 timestamps_utc is set, because then all times are in UTC anyway. */
4422 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4423 f.timestamps_utc = TRUE;
4426 uschar *envtz = US getenv("TZ");
4428 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4429 : timezone_string != NULL
4432 uschar **p = USS environ;
4436 if (environ) while (*p++) count++;
4437 if (!envtz) count++;
4438 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4439 if (environ) for (p = USS environ; *p; p++)
4440 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4441 if (timezone_string)
4443 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4444 sprintf(CS *newp++, "TZ=%s", timezone_string);
4449 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4450 tod_stamp(tod_log));
4454 /* Handle the case when we have removed the setuid privilege because of -C or
4455 -D. This means that the caller of Exim was not root.
4457 There is a problem if we were running as the Exim user. The sysadmin may
4458 expect this case to retain privilege because "the binary was called by the
4459 Exim user", but it hasn't, because either the -D option set macros, or the
4460 -C option set a non-trusted configuration file. There are two possibilities:
4462 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4463 to do message deliveries. Thus, the fact that it is running as a
4464 non-privileged user is plausible, and might be wanted in some special
4465 configurations. However, really_exim will have been set false when
4466 privilege was dropped, to stop Exim trying to write to its normal log
4467 files. Therefore, re-enable normal log processing, assuming the sysadmin
4468 has set up the log directory correctly.
4470 (2) If deliver_drop_privilege is not set, the configuration won't work as
4471 apparently intended, and so we log a panic message. In order to retain
4472 root for -C or -D, the caller must either be root or be invoking a
4473 trusted configuration file (when deliver_drop_privilege is false). */
4475 if ( removed_privilege
4476 && (!f.trusted_config || opt_D_used)
4477 && real_uid == exim_uid)
4478 if (deliver_drop_privilege)
4479 f.really_exim = TRUE; /* let logging work normally */
4481 log_write(0, LOG_MAIN|LOG_PANIC,
4482 "exim user lost privilege for using %s option",
4483 f.trusted_config? "-D" : "-C");
4485 /* Start up Perl interpreter if Perl support is configured and there is a
4486 perl_startup option, and the configuration or the command line specifies
4487 initializing starting. Note that the global variables are actually called
4488 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4491 if (perl_start_option != 0)
4492 opt_perl_at_start = (perl_start_option > 0);
4493 if (opt_perl_at_start && opt_perl_startup != NULL)
4496 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4497 if ((errstr = init_perl(opt_perl_startup)))
4498 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4499 opt_perl_started = TRUE;
4501 #endif /* EXIM_PERL */
4503 /* Log the arguments of the call if the configuration file said so. This is
4504 a debugging feature for finding out what arguments certain MUAs actually use.
4505 Don't attempt it if logging is disabled, or if listing variables or if
4506 verifying/testing addresses or expansions. */
4508 if ( (debug_selector & D_any || LOGGING(arguments))
4509 && f.really_exim && !list_options && !checking)
4511 uschar *p = big_buffer;
4512 Ustrcpy(p, US"cwd= (failed)");
4519 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4520 p += Ustrlen(CCS p);
4523 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4525 for (int i = 0; i < argc; i++)
4527 int len = Ustrlen(argv[i]);
4528 const uschar *printing;
4530 if (p + len + 8 >= big_buffer + big_buffer_size)
4532 Ustrcpy(p, US" ...");
4533 log_write(0, LOG_MAIN, "%s", big_buffer);
4534 Ustrcpy(big_buffer, US"...");
4537 printing = string_printing(argv[i]);
4538 if (!*printing) quote = US"\"";
4541 const uschar *pp = printing;
4543 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4545 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4546 (p - big_buffer) - 4), printing, quote);
4549 if (LOGGING(arguments))
4550 log_write(0, LOG_MAIN, "%s", big_buffer);
4552 debug_printf("%s\n", big_buffer);
4555 /* Set the working directory to be the top-level spool directory. We don't rely
4556 on this in the code, which always uses fully qualified names, but it's useful
4557 for core dumps etc. Don't complain if it fails - the spool directory might not
4558 be generally accessible and calls with the -C option (and others) have lost
4559 privilege by now. Before the chdir, we try to ensure that the directory exists.
4562 if (Uchdir(spool_directory) != 0)
4564 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4565 (void) Uchdir(spool_directory);
4568 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4569 alias file. Exim doesn't have such a concept, but this call is screwed into
4570 Sun's YP makefiles. Handle this by calling a configured script, as the real
4571 user who called Exim. The -oA option can be used to pass an argument to the
4576 (void) fclose(config_file);
4577 if (bi_command && *bi_command)
4580 const uschar * argv[3];
4581 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4582 if (alias_arg) argv[i++] = alias_arg;
4585 setgroups(group_count, group_list);
4586 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4588 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4589 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4591 execv(CS argv[0], (char *const *)argv);
4592 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4596 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4601 /* We moved the admin/trusted check to be immediately after reading the
4602 configuration file. We leave these prints here to ensure that syslog setup,
4603 logfile setup, and so on has already happened. */
4605 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4606 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4608 /* Only an admin user may start the daemon or force a queue run in the default
4609 configuration, but the queue run restriction can be relaxed. Only an admin
4610 user may request that a message be returned to its sender forthwith. Only an
4611 admin user may specify a debug level greater than D_v (because it might show
4612 passwords, etc. in lookup queries). Only an admin user may request a queue
4613 count. Only an admin user can use the test interface to scan for email
4614 (because Exim will be in the spool dir and able to look at mails). */
4618 BOOL debugset = (debug_selector & ~D_v) != 0;
4619 if ( deliver_give_up || f.daemon_listen || malware_test_file
4620 || count_queue && queue_list_requires_admin
4621 || list_queue && queue_list_requires_admin
4622 || qrunners && prod_requires_admin
4623 || queue_name_dest && prod_requires_admin
4624 || debugset && !f.running_in_test_harness
4626 exim_fail("exim:%s permission denied; not admin\n",
4627 debugset ? " debugging" : "");
4630 /* If the real user is not root or the exim uid, the argument for passing
4631 in an open TCP/IP connection for another message is not permitted, nor is
4632 running with the -N option for any delivery action, unless this call to exim is
4633 one that supplied an input message, or we are using a patched exim for
4634 regression testing. */
4636 if ( real_uid != root_uid && real_uid != exim_uid
4637 && ( continue_hostname
4639 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4641 && !f.running_in_test_harness
4643 exim_fail("exim: Permission denied; not exim user or root\n");
4645 /* If the caller is not trusted, certain arguments are ignored when running for
4646 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4647 Note that authority for performing certain actions on messages is tested in the
4648 queue_action() function. */
4650 if (!f.trusted_caller && !checking)
4652 sender_host_name = sender_host_address = interface_address =
4653 sender_ident = received_protocol = NULL;
4654 sender_host_port = interface_port = 0;
4655 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4658 /* If a sender host address is set, extract the optional port number off the
4659 end of it and check its syntax. Do the same thing for the interface address.
4660 Exim exits if the syntax is bad. */
4664 if (sender_host_address)
4665 sender_host_port = check_port(sender_host_address);
4666 if (interface_address)
4667 interface_port = check_port(interface_address);
4670 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4673 if (f.trusted_caller)
4675 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4676 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4679 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4682 /* If an SMTP message is being received check to see if the standard input is a
4683 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4684 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4689 union sockaddr_46 inetd_sock;
4690 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4691 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4693 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4694 if (family == AF_INET || family == AF_INET6)
4696 union sockaddr_46 interface_sock;
4697 size = sizeof(interface_sock);
4699 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4700 interface_address = host_ntoa(-1, &interface_sock, NULL,
4703 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4705 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4708 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4709 NULL, &sender_host_port);
4710 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4711 "inetd is not supported when mua_wrapper is set");
4715 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4720 /* If the load average is going to be needed while receiving a message, get it
4721 now for those OS that require the first call to os_getloadavg() to be done as
4722 root. There will be further calls later for each message received. */
4724 #ifdef LOAD_AVG_NEEDS_ROOT
4725 if ( receiving_message
4726 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4727 load_average = OS_GETLOADAVG();
4730 /* The queue_only configuration option can be overridden by -odx on the command
4731 line, except that if queue_only_override is false, queue_only cannot be unset
4732 from the command line. */
4734 if (queue_only_set && (queue_only_override || arg_queue_only))
4735 queue_only = arg_queue_only;
4737 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4740 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4741 if (arg_smtp_receive_timeout >= 0)
4742 smtp_receive_timeout = arg_smtp_receive_timeout;
4744 /* If Exim was started with root privilege, unless we have already removed the
4745 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4746 except when starting the daemon or doing some kind of delivery or address
4747 testing (-bt). These are the only cases when root need to be retained. We run
4748 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4749 retained only for starting the daemon. We always do the initgroups() in this
4750 situation (controlled by the TRUE below), in order to be as close as possible
4751 to the state Exim usually runs in. */
4753 if ( !unprivileged /* originally had root AND */
4754 && !removed_privilege /* still got root AND */
4755 && !f.daemon_listen /* not starting the daemon */
4756 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4757 && ( /* AND EITHER */
4758 deliver_drop_privilege /* requested unprivileged */
4760 !qrunners /* not running the queue */
4761 && ( msg_action_arg < 0 /* and */
4762 || msg_action != MSG_DELIVER /* not delivering */
4764 && (!checking || !f.address_test_mode) /* not address checking */
4765 && !rcpt_verify_quota /* and not quota checking */
4767 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4769 /* When we are retaining a privileged uid, we still change to the exim gid. */
4774 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4775 rv = setgid(exim_gid);
4776 /* Impact of failure is that some stuff might end up with an incorrect group.
4777 We track this for failures from root, since any attempt to change privilege
4778 by root should succeed and failures should be examined. For non-root,
4779 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4780 no need to complain then. */
4782 if (!(unprivileged || removed_privilege))
4783 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4786 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4787 (long int)exim_gid, strerror(errno));
4791 /* Handle a request to scan a file for malware */
4792 if (malware_test_file)
4794 #ifdef WITH_CONTENT_SCAN
4796 set_process_info("scanning file for malware");
4797 if ((result = malware_in_file(malware_test_file)) == FAIL)
4799 printf("No malware found.\n");
4800 exim_exit(EXIT_SUCCESS);
4804 printf("Malware lookup returned non-okay/fail: %d\n", result);
4805 exim_exit(EXIT_FAILURE);
4808 printf("Malware found: %s\n", malware_name);
4810 printf("Malware scan detected malware of unknown name.\n");
4812 printf("Malware scanning not enabled at compile time.\n");
4814 exim_exit(EXIT_FAILURE);
4817 /* Handle a request to list the delivery queue */
4821 set_process_info("listing the queue");
4822 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4823 exim_exit(EXIT_SUCCESS);
4826 /* Handle a request to count the delivery queue */
4830 set_process_info("counting the queue");
4831 fprintf(stdout, "%u\n", queue_count());
4832 exim_exit(EXIT_SUCCESS);
4835 /* Handle actions on specific messages, except for the force delivery and
4836 message load actions, which are done below. Some actions take a whole list of
4837 message ids, which are known to continue up to the end of the arguments. Others
4838 take a single message id and then operate on the recipients list. */
4840 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4842 int yield = EXIT_SUCCESS;
4843 set_process_info("acting on specified messages");
4845 /* ACL definitions may be needed when removing a message (-Mrm) because
4846 event_action gets expanded */
4848 if (msg_action == MSG_REMOVE)
4850 int old_pool = store_pool;
4851 store_pool = POOL_CONFIG;
4853 store_pool = old_pool;
4854 store_writeprotect(POOL_CONFIG);
4857 if (!one_msg_action)
4859 for (i = msg_action_arg; i < argc; i++)
4860 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4861 yield = EXIT_FAILURE;
4864 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4865 default: printf("\n"); break;
4869 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4870 recipients_arg)) yield = EXIT_FAILURE;
4874 /* We used to set up here to skip reading the ACL section, on
4875 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4876 Now, since the intro of the ${acl } expansion, ACL definitions may be
4877 needed in transports so we lost the optimisation. */
4880 int old_pool = store_pool;
4881 #ifdef MEASURE_TIMING
4883 (void)gettimeofday(&t0, NULL);
4886 store_pool = POOL_CONFIG;
4888 store_pool = old_pool;
4890 /* -be can add macro definitions, needing to link to the macro structure
4891 chain. Otherwise, make the memory used for config data readonly. */
4893 if (!expansion_test)
4894 store_writeprotect(POOL_CONFIG);
4896 #ifdef MEASURE_TIMING
4897 report_time_since(&t0, US"readconf_rest (delta)");
4901 /* Handle a request to check quota */
4902 if (rcpt_verify_quota)
4903 if (real_uid != root_uid && real_uid != exim_uid)
4904 exim_fail("exim: Permission denied\n");
4905 else if (recipients_arg >= argc)
4906 exim_fail("exim: missing recipient for quota check\n");
4909 verify_quota(US argv[recipients_arg]); /*XXX we lose track of const here */
4910 exim_exit(EXIT_SUCCESS);
4913 /* Handle the -brt option. This is for checking out retry configurations.
4914 The next three arguments are a domain name or a complete address, and
4915 optionally two error numbers. All it does is to call the function that
4916 scans the retry configuration data. */
4918 if (test_retry_arg >= 0)
4920 retry_config *yield;
4921 int basic_errno = 0;
4923 const uschar *s1, *s2;
4925 if (test_retry_arg >= argc)
4927 printf("-brt needs a domain or address argument\n");
4928 exim_exit(EXIT_FAILURE);
4930 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4933 /* If the first argument contains no @ and no . it might be a local user
4934 or it might be a single-component name. Treat as a domain. */
4936 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4938 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4939 "being \ntreated as a one-component domain, not as a local part.\n\n",
4943 /* There may be an optional second domain arg. */
4945 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4946 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4948 /* The final arg is an error name */
4950 if (test_retry_arg < argc)
4952 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4954 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4957 printf("%s\n", CS error);
4958 return EXIT_FAILURE;
4961 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4962 code > 100 as an error is for matching codes to the decade. Turn them into
4963 a real error code, off the decade. */
4965 if (basic_errno == ERRNO_MAIL4XX ||
4966 basic_errno == ERRNO_RCPT4XX ||
4967 basic_errno == ERRNO_DATA4XX)
4969 int code = (more_errno >> 8) & 255;
4971 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4972 else if (code > 100)
4973 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4977 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4978 printf("No retry information found\n");
4981 more_errno = yield->more_errno;
4982 printf("Retry rule: %s ", yield->pattern);
4984 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4986 printf("quota%s%s ",
4987 (more_errno > 0)? "_" : "",
4988 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4990 else if (yield->basic_errno == ECONNREFUSED)
4992 printf("refused%s%s ",
4993 (more_errno > 0)? "_" : "",
4994 (more_errno == 'M')? "MX" :
4995 (more_errno == 'A')? "A" : "");
4997 else if (yield->basic_errno == ETIMEDOUT)
5000 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
5002 if (more_errno != 0) printf("_%s",
5003 (more_errno == 'M')? "MX" : "A");
5006 else if (yield->basic_errno == ERRNO_AUTHFAIL)
5007 printf("auth_failed ");
5010 for (retry_rule * r = yield->rules; r; r = r->next)
5012 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
5013 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
5019 printf(",%d.", x/1000);
5033 exim_exit(EXIT_SUCCESS);
5036 /* Handle a request to list one or more configuration options */
5037 /* If -n was set, we suppress some information */
5042 set_process_info("listing variables");
5043 if (recipients_arg >= argc)
5044 fail = !readconf_print(US"all", NULL, flag_n);
5045 else for (i = recipients_arg; i < argc; i++)
5048 (Ustrcmp(argv[i], "router") == 0 ||
5049 Ustrcmp(argv[i], "transport") == 0 ||
5050 Ustrcmp(argv[i], "authenticator") == 0 ||
5051 Ustrcmp(argv[i], "macro") == 0 ||
5052 Ustrcmp(argv[i], "environment") == 0))
5054 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
5058 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
5060 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
5065 set_process_info("listing config");
5066 exim_exit(readconf_print(US"config", NULL, flag_n)
5067 ? EXIT_SUCCESS : EXIT_FAILURE);
5071 /* Initialise subsystems as required. */
5075 /* Handle a request to deliver one or more messages that are already on the
5076 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
5077 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
5079 Delivery of specific messages is typically used for a small number when
5080 prodding by hand (when the option forced_delivery will be set) or when
5081 re-execing to regain root privilege. Each message delivery must happen in a
5082 separate process, so we fork a process for each one, and run them sequentially
5083 so that debugging output doesn't get intertwined, and to avoid spawning too
5084 many processes if a long list is given. However, don't fork for the last one;
5085 this saves a process in the common case when Exim is called to deliver just one
5088 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
5090 if (prod_requires_admin && !f.admin_user)
5092 fprintf(stderr, "exim: Permission denied\n");
5093 exim_exit(EXIT_FAILURE);
5095 set_process_info("delivering specified messages");
5096 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
5097 for (i = msg_action_arg; i < argc; i++)
5101 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
5102 that runs into a later copy into the untainted global message_id[] */
5103 /*XXX Do we need a length limit check here? */
5105 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5106 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
5108 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5109 exim_underbar_exit(EXIT_SUCCESS);
5113 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
5115 exim_exit(EXIT_FAILURE);
5119 exim_exit(EXIT_SUCCESS);
5123 /* If only a single queue run is requested, without SMTP listening, we can just
5124 turn into a queue runner, with an optional starting message id. */
5126 if (is_onetime_qrun() && !f.daemon_listen)
5128 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
5129 exim_exit(EXIT_SUCCESS);
5133 /* Find the login name of the real user running this process. This is always
5134 needed when receiving a message, because it is written into the spool file. It
5135 may also be used to construct a from: or a sender: header, and in this case we
5136 need the user's full name as well, so save a copy of it, checked for RFC822
5137 syntax and munged if necessary, if it hasn't previously been set by the -F
5138 argument. We may try to get the passwd entry more than once, in case NIS or
5139 other delays are in evidence. Save the home directory for use in filter testing
5144 if ((pw = getpwuid(real_uid)) != NULL)
5146 originator_login = string_copy(US pw->pw_name);
5147 originator_home = string_copy(US pw->pw_dir);
5149 /* If user name has not been set by -F, set it from the passwd entry
5150 unless -f has been used to set the sender address by a trusted user. */
5152 if (!originator_name)
5154 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5156 uschar *name = US pw->pw_gecos;
5157 uschar *amp = Ustrchr(name, '&');
5160 /* Most Unix specify that a '&' character in the gecos field is
5161 replaced by a copy of the login name, and some even specify that
5162 the first character should be upper cased, so that's what we do. */
5167 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5168 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5169 buffer[loffset] = toupper(buffer[loffset]);
5173 /* If a pattern for matching the gecos field was supplied, apply
5174 it and then expand the name string. */
5176 GET_OPTION("gecos_pattern");
5177 GET_OPTION("gecos_name");
5178 if (gecos_pattern && gecos_name)
5180 const pcre2_code *re;
5181 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5183 if (regex_match_and_setup(re, name, 0, -1))
5185 uschar *new_name = expand_string(gecos_name);
5189 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5190 "gecos field \"%s\"\n", new_name, name);
5193 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5194 "\"%s\": %s\n", gecos_name, expand_string_message);
5196 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5197 "gecos field \"%s\"\n", gecos_pattern, name);
5198 store_free((void *)re);
5200 originator_name = string_copy(name);
5203 /* A trusted caller has used -f but not -F */
5205 else originator_name = US"";
5208 /* Break the retry loop */
5213 if (++i > finduser_retries) break;
5217 /* If we cannot get a user login, log the incident and give up, unless the
5218 configuration specifies something to use. When running in the test harness,
5219 any setting of unknown_login overrides the actual name. */
5221 if (!originator_login || f.running_in_test_harness)
5223 GET_OPTION("unknown_login");
5226 originator_login = expand_string(unknown_login);
5227 if (!originator_name && unknown_username)
5228 originator_name = expand_string(unknown_username);
5229 if (!originator_name) originator_name = US"";
5231 if (!originator_login)
5232 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5236 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5239 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5241 /* If a message is created by this call of Exim, the uid/gid of its originator
5242 are those of the caller. These values are overridden if an existing message is
5243 read in from the spool. */
5245 originator_uid = real_uid;
5246 originator_gid = real_gid;
5248 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5249 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5251 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5252 returns. We leave this till here so that the originator_ fields are available
5253 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5256 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5260 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5261 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5262 "mua_wrapper is set");
5265 # ifndef DISABLE_TLS
5266 /* This also checks that the library linkage is working and we can call
5267 routines in it, so call even if tls_require_ciphers is unset */
5269 # ifdef MEASURE_TIMING
5271 (void)gettimeofday(&t0, NULL);
5273 if (!tls_dropprivs_validate_require_cipher(FALSE))
5274 exim_exit(EXIT_FAILURE);
5275 # ifdef MEASURE_TIMING
5276 report_time_since(&t0, US"validate_ciphers (delta)");
5284 /* If the sender ident has not been set (by a trusted caller) set it to
5285 the caller. This will get overwritten below for an inetd call. If a trusted
5286 caller has set it empty, unset it. */
5288 if (!sender_ident) sender_ident = originator_login;
5289 else if (!*sender_ident) sender_ident = NULL;
5291 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5292 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5293 originator_* variables set. */
5295 if (test_rewrite_arg >= 0)
5297 f.really_exim = FALSE;
5298 if (test_rewrite_arg >= argc)
5300 printf("-brw needs an address argument\n");
5301 exim_exit(EXIT_FAILURE);
5303 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5304 exim_exit(EXIT_SUCCESS);
5307 /* A locally-supplied message is considered to be coming from a local user
5308 unless a trusted caller supplies a sender address with -f, or is passing in the
5309 message via SMTP (inetd invocation or otherwise). */
5311 if ( !sender_address && !smtp_input
5312 || !f.trusted_caller && filter_test == FTEST_NONE)
5314 f.sender_local = TRUE;
5316 /* A trusted caller can supply authenticated_sender and authenticated_id
5317 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5318 defaults except when host checking. */
5320 if (!authenticated_sender && !host_checking)
5321 authenticated_sender = string_sprintf("%s@%s", originator_login,
5322 qualify_domain_sender);
5323 if (!authenticated_id && !host_checking)
5324 authenticated_id = originator_login;
5327 /* Trusted callers are always permitted to specify the sender address.
5328 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5329 is specified is the empty address. However, if a trusted caller does not
5330 specify a sender address for SMTP input, we leave sender_address unset. This
5331 causes the MAIL commands to be honoured. */
5333 if ( !smtp_input && !sender_address
5334 || !receive_check_set_sender(sender_address))
5336 /* Either the caller is not permitted to set a general sender, or this is
5337 non-SMTP input and the trusted caller has not set a sender. If there is no
5338 sender, or if a sender other than <> is set, override with the originator's
5339 login (which will get qualified below), except when checking things. */
5341 if ( !sender_address /* No sender_address set */
5343 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5344 !checking)) /* Not running tests, including filter tests */
5346 sender_address = originator_login;
5347 f.sender_address_forced = FALSE;
5348 sender_address_domain = 0;
5352 /* Remember whether an untrusted caller set the sender address */
5354 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5356 /* Ensure that the sender address is fully qualified unless it is the empty
5357 address, which indicates an error message, or doesn't exist (root caller, smtp
5358 interface, no -f argument). */
5360 if (sender_address && *sender_address && sender_address_domain == 0)
5361 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5362 qualify_domain_sender);
5364 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5366 /* Handle a request to verify a list of addresses, or test them for delivery.
5367 This must follow the setting of the sender address, since routers can be
5368 predicated upon the sender. If no arguments are given, read addresses from
5369 stdin. Set debug_level to at least D_v to get full output for address testing.
5372 if (verify_address_mode || f.address_test_mode)
5375 int flags = vopt_qualify;
5377 if (verify_address_mode)
5379 if (!verify_as_sender) flags |= vopt_is_recipient;
5380 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5385 flags |= vopt_is_recipient;
5386 debug_selector |= D_v;
5387 debug_file = stderr;
5388 debug_fd = fileno(debug_file);
5389 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5392 if (recipients_arg < argc)
5393 while (recipients_arg < argc)
5395 /* Supplied addresses are tainted since they come from a user */
5396 uschar * s = string_copy_taint(
5397 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5401 BOOL finished = FALSE;
5402 uschar *ss = parse_find_address_end(s, FALSE);
5403 if (*ss == ',') *ss = 0; else finished = TRUE;
5404 test_address(s, flags, &exit_value);
5407 while (*++s == ',' || isspace(*s)) ;
5413 uschar * s = get_stdinput(NULL, NULL);
5415 test_address(string_copy_taint(
5416 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5418 flags, &exit_value);
5422 exim_exit(exit_value);
5425 /* Handle expansion checking. Either expand items on the command line, or read
5426 from stdin if there aren't any. If -Mset was specified, load the message so
5427 that its variables can be used, but restrict this facility to admin users.
5428 Otherwise, if -bem was used, read a message from stdin. */
5432 dns_init(FALSE, FALSE, FALSE);
5433 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5437 exim_fail("exim: permission denied\n");
5438 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5439 /* Checking the length of the ID is sufficient to validate it.
5440 Get an untainted version so file opens can be done. */
5441 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5443 spoolname = string_sprintf("%s-H", message_id);
5444 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5445 printf ("Failed to load message datafile %s\n", message_id);
5446 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5447 printf ("Failed to load message %s\n", message_id);
5450 /* Read a test message from a file. We fudge it up to be on stdin, saving
5451 stdin itself for later reading of expansion strings. */
5453 else if (expansion_test_message)
5455 uschar * rme = expand_string(recipients_max);
5456 int save_stdin = dup(0);
5457 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5459 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5462 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5463 message_ended = END_NOTENDED;
5464 recipients_max_expanded = atoi(CCS rme);
5465 read_message_body(receive_msg(extract_recipients));
5466 message_linecount += body_linecount;
5467 (void)dup2(save_stdin, 0);
5468 (void)close(save_stdin);
5469 clearerr(stdin); /* Required by Darwin */
5472 /* Only admin users may see config-file macros this way */
5474 if (!f.admin_user) macros_user = macros = mlast = NULL;
5476 /* Allow $recipients for this testing */
5478 f.enable_dollar_recipients = TRUE;
5480 /* Expand command line items */
5482 if (recipients_arg < argc)
5483 while (recipients_arg < argc)
5484 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5490 char *(*fn_readline)(const char *) = NULL;
5491 void (*fn_addhist)(const char *) = NULL;
5495 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5498 while (s = get_stdinput(fn_readline, fn_addhist))
5499 expansion_test_line(s);
5502 if (dlhandle) dlclose(dlhandle);
5506 /* The data file will be open after -Mset */
5508 if (deliver_datafile >= 0)
5510 (void)close(deliver_datafile);
5511 deliver_datafile = -1;
5514 exim_exit(EXIT_SUCCESS);
5518 /* The active host name is normally the primary host name, but it can be varied
5519 for hosts that want to play several parts at once. We need to ensure that it is
5520 set for host checking, and for receiving messages. */
5522 smtp_active_hostname = primary_hostname;
5523 GET_OPTION("smtp_active_hostname");
5524 if (raw_active_hostname)
5526 uschar * nah = expand_string(raw_active_hostname);
5529 if (!f.expand_string_forcedfail)
5530 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5531 "(smtp_active_hostname): %s", raw_active_hostname,
5532 expand_string_message);
5534 else if (nah[0]) smtp_active_hostname = nah;
5537 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5538 given IP address so that the blocking and relay configuration can be tested.
5539 Unless a sender_ident was set by -oMt, we discard it (the default is the
5540 caller's login name). An RFC 1413 call is made only if we are running in the
5541 test harness and an incoming interface and both ports are specified, because
5542 there is no TCP/IP call to find the ident for. */
5549 if (!sender_ident_set)
5551 sender_ident = NULL;
5552 if (f.running_in_test_harness && sender_host_port
5553 && interface_address && interface_port)
5554 verify_get_ident(1223); /* note hardwired port number */
5557 /* In case the given address is a non-canonical IPv6 address, canonicalize
5558 it. Use the compressed form for IPv6. */
5560 size = host_aton(sender_host_address, x);
5561 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5563 (void) host_nmtoa(size, x, -1, sender_host_address, ':');
5565 (void) ipv6_nmtoa(x, sender_host_address);
5567 /* Now set up for testing */
5569 host_build_sender_fullhost();
5573 f.sender_local = FALSE;
5574 f.sender_host_notsocket = TRUE;
5575 debug_file = stderr;
5576 debug_fd = fileno(debug_file);
5577 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5578 "**** but without any ident (RFC 1413) callback.\n"
5579 "**** This is not for real!\n\n",
5580 sender_host_address);
5582 set_connection_id();
5583 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5584 if (verify_check_host(&hosts_connection_nolog) == OK)
5586 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5587 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5589 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5591 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5592 because a log line has already been written for all its failure exists
5593 (usually "connection refused: <reason>") and writing another one is
5594 unnecessary clutter. */
5596 if (smtp_start_session())
5599 for (; (reset_point = store_mark()); store_reset(reset_point))
5601 if (smtp_setup_msg() <= 0) break;
5602 if (!receive_msg(FALSE)) break;
5604 return_path = sender_address = NULL;
5605 dnslist_domain = dnslist_matched = NULL;
5606 #ifndef DISABLE_DKIM
5607 dkim_cur_signer = NULL;
5610 deliver_localpart_orig = NULL;
5611 deliver_domain_orig = NULL;
5612 callout_address = sending_ip_address = NULL;
5613 deliver_localpart_data = deliver_domain_data =
5614 recipient_data = sender_data = NULL;
5615 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5619 exim_exit(EXIT_SUCCESS);
5623 /* Arrange for message reception if recipients or SMTP were specified;
5624 otherwise complain unless a version print (-bV) happened or this is a filter
5625 verification test or info dump.
5626 In the former case, show the configuration file name. */
5628 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5630 if (version_printed)
5632 if (Ustrchr(config_main_filelist, ':'))
5633 printf("Configuration file search path is %s\n", config_main_filelist);
5634 printf("Configuration file is %s\n", config_main_filename);
5635 return EXIT_SUCCESS;
5638 if (info_flag != CMDINFO_NONE)
5640 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5641 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5644 if (filter_test == FTEST_NONE)
5645 exim_usage(called_as);
5649 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5650 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5651 that we are not called from inetd, because that is rejected above. The
5652 following configuration settings are forced here:
5654 (1) Synchronous delivery (-odi)
5655 (2) Errors to stderr (-oep == -oeq)
5656 (3) No parallel remote delivery
5657 (4) Unprivileged delivery
5659 We don't force overall queueing options because there are several of them;
5660 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5661 to override any SMTP queueing. */
5665 f.synchronous_delivery = TRUE;
5666 arg_error_handling = ERRORS_STDERR;
5667 remote_max_parallel = 1;
5668 deliver_drop_privilege = TRUE;
5669 f.queue_smtp = FALSE;
5670 queue_smtp_domains = NULL;
5672 message_utf8_downconvert = -1; /* convert-if-needed */
5677 /* Prepare to accept one or more new messages on the standard input. When a
5678 message has been read, its id is returned in message_id[]. If doing immediate
5679 delivery, we fork a delivery process for each received message, except for the
5680 last one, where we can save a process switch.
5682 It is only in non-smtp mode that error_handling is allowed to be changed from
5683 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5684 sendmail error modes other than -oem ever actually used? Later: yes.) */
5686 if (!smtp_input) error_handling = arg_error_handling;
5688 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5689 logging being sent down the socket and make an identd call to get the
5692 else if (f.is_inetd)
5694 (void)fclose(stderr);
5695 exim_nullstd(); /* Re-open to /dev/null */
5696 verify_get_ident(IDENT_PORT);
5697 host_build_sender_fullhost();
5698 set_process_info("handling incoming connection from %s via inetd",
5702 /* If the sender host address has been set, build sender_fullhost if it hasn't
5703 already been done (which it will have been for inetd). This caters for the
5704 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5705 so that the test for IP options is skipped for -bs input. */
5707 if (sender_host_address && !sender_fullhost)
5709 host_build_sender_fullhost();
5710 set_process_info("handling incoming connection from %s via -oMa",
5712 f.sender_host_notsocket = TRUE;
5715 /* Otherwise, set the sender host as unknown except for inetd calls. This
5716 prevents host checking in the case of -bs not from inetd and also for -bS. */
5718 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5720 /* If stdout does not exist, then dup stdin to stdout. This can happen
5721 if exim is started from inetd. In this case fd 0 will be set to the socket,
5722 but fd 1 will not be set. This also happens for passed SMTP channels. */
5724 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5726 /* Set up the incoming protocol name and the state of the program. Root is
5727 allowed to force received protocol via the -oMr option above. If we have come
5728 via inetd, the process info has already been set up. We don't set
5729 received_protocol here for smtp input, as it varies according to
5730 batch/HELO/EHLO/AUTH/TLS. */
5734 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5735 smtp_batched_input? "batched " : "",
5736 sender_address ? sender_address : originator_login);
5740 int old_pool = store_pool;
5741 store_pool = POOL_PERM;
5742 if (!received_protocol)
5743 received_protocol = string_sprintf("local%s", called_as);
5744 store_pool = old_pool;
5745 set_process_info("accepting a local non-SMTP message from <%s>",
5749 /* Initialize the session_local_queue-only flag (this will be ignored if
5750 mua_wrapper is set) */
5753 session_local_queue_only = queue_only;
5755 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5756 the spool if so configured. On failure, we must not attempt to send an error
5757 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5758 error code is given.) */
5760 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5761 exim_fail("exim: insufficient disk space\n");
5763 /* If this is smtp input of any kind, real or batched, handle the start of the
5766 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5767 because a log line has already been written for all its failure exists
5768 (usually "connection refused: <reason>") and writing another one is
5769 unnecessary clutter. */
5771 set_connection_id();
5776 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5777 if (verify_check_host(&hosts_connection_nolog) == OK)
5779 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5780 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5782 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5783 if (!smtp_start_session())
5786 exim_exit(EXIT_SUCCESS);
5790 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5791 (we handle buferring so as to have visibility of fill level). */
5795 GET_OPTION("message_size_limit");
5796 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5797 if (expand_string_message)
5798 if (thismessage_size_limit == -1)
5799 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5800 "message_size_limit: %s", expand_string_message);
5802 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5803 "message_size_limit: %s", expand_string_message);
5805 setvbuf(stdin, NULL, _IONBF, 0);
5808 /* Loop for several messages when reading SMTP input. If we fork any child
5809 processes, we don't want to wait for them unless synchronous delivery is
5810 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5811 same as SIG_DFL, despite the fact that documentation often lists the default as
5812 "ignore". This is a confusing area. This is what I know:
5814 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5815 processes that complete simply to go away without ever becoming defunct. You
5816 can't then wait for them - but we don't want to wait for them in the
5817 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5818 happen for all OS (e.g. *BSD is different).
5820 But that's not the end of the story. Some (many? all?) systems have the
5821 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5822 has by default, so it seems that the difference is merely one of default
5823 (compare restarting vs non-restarting signals).
5825 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5826 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5827 of the loop below. Paranoia rules.
5829 February 2003: That's *still* not the end of the story. There are now versions
5830 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5831 process then calls waitpid(), a grumble is written to the system log, because
5832 this is logically inconsistent. In other words, it doesn't like the paranoia.
5833 As a consequence of this, the waitpid() below is now excluded if we are sure
5834 that SIG_IGN works. */
5836 if (!f.synchronous_delivery)
5839 struct sigaction act;
5840 act.sa_handler = SIG_IGN;
5841 sigemptyset(&(act.sa_mask));
5842 act.sa_flags = SA_NOCLDWAIT;
5843 sigaction(SIGCHLD, &act, NULL);
5845 signal(SIGCHLD, SIG_IGN);
5849 /* Save the current store pool point, for resetting at the start of
5850 each message, and save the real sender address, if any. */
5852 real_sender_address = sender_address;
5854 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5855 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5858 for (BOOL more = TRUE; more; )
5860 rmark reset_point = store_mark();
5863 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5864 input and build the recipients list, before calling receive_msg() to read the
5865 message proper. Whatever sender address is given in the SMTP transaction is
5866 often ignored for local senders - we use the actual sender, which is normally
5867 either the underlying user running this process or a -f argument provided by
5868 a trusted caller. It is saved in real_sender_address. The test for whether to
5869 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5874 if ((rc = smtp_setup_msg()) > 0)
5876 if ( real_sender_address
5877 && !receive_check_set_sender(sender_address))
5879 sender_address = raw_sender = real_sender_address;
5880 sender_address_unrewritten = NULL;
5883 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5884 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5885 the very end. The result of the ACL is ignored (as for other non-SMTP
5886 messages). It is run for its potential side effects. */
5888 if (smtp_batched_input)
5890 GET_OPTION("acl_not_smtp_start");
5891 if (acl_not_smtp_start)
5893 uschar * user_msg, * log_msg;
5894 f.enable_dollar_recipients = TRUE;
5895 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5896 &user_msg, &log_msg);
5897 f.enable_dollar_recipients = FALSE;
5901 /* Now get the data for the message */
5903 more = receive_msg(extract_recipients);
5906 cancel_cutthrough_connection(TRUE, US"receive dropped");
5907 if (more) goto MORELOOP;
5908 smtp_log_no_mail(); /* Log no mail if configured */
5909 exim_exit(EXIT_FAILURE);
5914 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5915 smtp_log_no_mail(); /* Log no mail if configured */
5916 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5920 /* In the non-SMTP case, we have all the information from the command
5921 line, but must process it in case it is in the more general RFC822
5922 format, and in any case, to detect syntax errors. Also, it appears that
5923 the use of comma-separated lists as single arguments is common, so we
5924 had better support them. */
5928 uschar * rme = expand_string(recipients_max);
5929 int rcount = 0, count = argc - recipients_arg;
5930 const uschar ** list = argv + recipients_arg;
5932 recipients_max_expanded = atoi(CCS rme);
5934 /* These options cannot be changed dynamically for non-SMTP messages */
5936 f.active_local_sender_retain = local_sender_retain;
5937 f.active_local_from_check = local_from_check;
5939 /* Save before any rewriting */
5941 raw_sender = string_copy(sender_address);
5943 /* Loop for each argument (supplied by user hence tainted) */
5945 for (int i = 0; i < count; i++)
5947 int start, end, domain;
5949 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5950 We'll still want to cap it to something, just in case. */
5951 uschar * s = string_copy_taint(
5952 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5955 /* Loop for each comma-separated address */
5959 BOOL finished = FALSE;
5961 uschar * ss = parse_find_address_end(s, FALSE);
5963 if (*ss == ',') *ss = 0; else finished = TRUE;
5965 /* Check max recipients - if -t was used, these aren't recipients */
5967 if ( recipients_max_expanded > 0 && ++rcount > recipients_max_expanded
5968 && !extract_recipients)
5970 DEBUG(D_all) debug_printf("excess reipients (max %d)\n",
5971 recipients_max_expanded);
5973 if (error_handling == ERRORS_STDERR)
5975 fprintf(stderr, "exim: too many recipients\n");
5976 exim_exit(EXIT_FAILURE);
5980 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5981 errors_sender_rc : EXIT_FAILURE;
5986 BOOL b = allow_utf8_domains;
5987 allow_utf8_domains = TRUE;
5990 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5994 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5995 else allow_utf8_domains = b;
6000 if (domain == 0 && !f.allow_unqualified_recipient)
6003 errmess = US"unqualified recipient address not allowed";
6008 DEBUG(D_all) debug_printf("bad recipient address \"%s\": %s\n",
6009 string_printing(list[i]), errmess);
6011 if (error_handling == ERRORS_STDERR)
6013 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
6014 string_printing(list[i]), errmess);
6015 exim_exit(EXIT_FAILURE);
6021 eblock.text1 = string_printing(list[i]);
6022 eblock.text2 = errmess;
6024 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
6025 errors_sender_rc : EXIT_FAILURE;
6029 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
6032 while (*++s && (*s == ',' || isspace(*s)));
6036 /* Show the recipients when debugging */
6040 if (sender_address) debug_printf("Sender: %s\n", sender_address);
6041 if (recipients_list)
6043 debug_printf("Recipients:\n");
6044 for (int i = 0; i < recipients_count; i++)
6045 debug_printf(" %s\n", recipients_list[i].address);
6049 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
6050 ignored; rejecting here would just add complication, and it can just as
6051 well be done later. Allow $recipients to be visible in the ACL. */
6053 GET_OPTION("acl_not_smtp_start");
6054 if (acl_not_smtp_start)
6056 uschar * user_msg, * log_msg;
6057 f.enable_dollar_recipients = TRUE;
6058 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
6059 &user_msg, &log_msg);
6060 f.enable_dollar_recipients = FALSE;
6063 /* Pause for a while waiting for input. If none received in that time,
6064 close the logfile, if we had one open; then if we wait for a long-running
6065 datasource (months, in one use-case) log rotation will not leave us holding
6068 if (!receive_timeout)
6069 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
6072 /* Read the data for the message. If filter_test is not FTEST_NONE, this
6073 will just read the headers for the message, and not write anything onto the
6076 message_ended = END_NOTENDED;
6077 more = receive_msg(extract_recipients);
6079 /* more is always FALSE here (not SMTP message) when reading a message
6080 for real; when reading the headers of a message for filter testing,
6081 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
6083 if (!message_id[0]) exim_exit(EXIT_FAILURE);
6084 } /* Non-SMTP message reception */
6086 /* If this is a filter testing run, there are headers in store, but
6087 no message on the spool. Run the filtering code in testing mode, setting
6088 the domain to the qualify domain and the local part to the current user,
6089 unless they have been set by options. The prefix and suffix are left unset
6090 unless specified. The the return path is set to to the sender unless it has
6091 already been set from a return-path header in the message. */
6093 if (filter_test != FTEST_NONE)
6095 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
6096 deliver_domain_orig = deliver_domain;
6097 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
6098 deliver_localpart_orig = deliver_localpart;
6099 deliver_localpart_prefix = US ftest_prefix;
6100 deliver_localpart_suffix = US ftest_suffix;
6101 deliver_home = originator_home;
6105 printf("Return-path copied from sender\n");
6106 return_path = string_copy(sender_address);
6109 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
6110 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
6112 receive_add_recipient(
6113 string_sprintf("%s%s%s@%s",
6114 ftest_prefix ? ftest_prefix : US"",
6116 ftest_suffix ? ftest_suffix : US"",
6117 deliver_domain), -1);
6119 printf("Recipient = %s\n", recipients_list[0].address);
6120 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
6121 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
6123 if (chdir("/")) /* Get away from wherever the user is running this from */
6125 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
6126 exim_exit(EXIT_FAILURE);
6129 /* Now we run either a system filter test, or a user filter test, or both.
6130 In the latter case, headers added by the system filter will persist and be
6131 available to the user filter. We need to copy the filter variables
6134 if (filter_test & FTEST_SYSTEM)
6135 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
6136 exim_exit(EXIT_FAILURE);
6138 memcpy(filter_sn, filter_n, sizeof(filter_sn));
6140 if (filter_test & FTEST_USER)
6141 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
6142 exim_exit(EXIT_FAILURE);
6144 exim_exit(EXIT_SUCCESS);
6147 /* Else act on the result of message reception. We should not get here unless
6148 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
6149 will be TRUE. If it is not, check on the number of messages received in this
6152 if ( !session_local_queue_only
6153 && smtp_accept_queue_per_connection > 0
6154 && receive_messagecount > smtp_accept_queue_per_connection)
6156 session_local_queue_only = TRUE;
6157 queue_only_reason = 2;
6160 /* Initialize local_queue_only from session_local_queue_only. If it is false,
6161 and queue_only_load is set, check that the load average is below it. If it is
6162 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
6163 default), we put the whole session into queue_only mode. It then remains this
6164 way for any subsequent messages on the same SMTP connection. This is a
6165 deliberate choice; even though the load average may fall, it doesn't seem
6166 right to deliver later messages on the same call when not delivering earlier
6167 ones. However, there are odd cases where this is not wanted, so this can be
6168 changed by setting queue_only_load_latch false. */
6170 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
6171 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
6173 queue_only_reason = 3;
6174 if (queue_only_load_latch) session_local_queue_only = TRUE;
6177 /* If running as an MUA wrapper, all queueing options and freezing options
6181 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6183 /* Log the queueing here, when it will get a message id attached, but
6184 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6187 if (local_queue_only)
6189 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6190 switch(queue_only_reason)
6193 log_write(L_delay_delivery,
6194 LOG_MAIN, "no immediate delivery: more than %d messages "
6195 "received in one connection", smtp_accept_queue_per_connection);
6199 log_write(L_delay_delivery,
6200 LOG_MAIN, "no immediate delivery: load average %.2f",
6201 (double)load_average/1000.0);
6206 else if (f.queue_only_policy || f.deliver_freeze)
6207 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6209 /* Else do the delivery unless the ACL or local_scan() called for queue only
6210 or froze the message. Always deliver in a separate process. A fork failure is
6211 not a disaster, as the delivery will eventually happen on a subsequent queue
6212 run. The search cache must be tidied before the fork, as the parent will
6213 do it before exiting. The child will trigger a lookup failure and
6214 thereby defer the delivery if it tries to use (for example) a cached ldap
6215 connection that the parent has called unbind on. */
6222 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6225 close_unwanted(); /* Close unwanted file descriptors and TLS */
6226 exim_nullstd(); /* Ensure std{in,out,err} exist */
6228 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6229 mode, deliver_drop_privilege is forced TRUE). */
6231 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6233 delivery_re_exec(CEE_EXEC_EXIT);
6234 /* Control does not return here. */
6237 /* No need to re-exec */
6239 rc = deliver_message(message_id, FALSE, FALSE);
6241 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6242 ? EXIT_SUCCESS : EXIT_FAILURE);
6247 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6248 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6249 "process: %s", strerror(errno));
6253 release_cutthrough_connection(US"msg passed for delivery");
6255 /* In the parent, wait if synchronous delivery is required. This will
6256 always be the case in MUA wrapper mode. */
6258 if (f.synchronous_delivery)
6261 while (wait(&status) != pid);
6262 if ((status & 0x00ff) != 0)
6263 log_write(0, LOG_MAIN|LOG_PANIC,
6264 "process %d crashed with signal %d while delivering %s",
6265 (int)pid, status & 0x00ff, message_id);
6266 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6271 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6272 automatically reaps children (see comments above the loop), clear away any
6273 finished subprocesses here, in case there are lots of messages coming in
6274 from the same source. */
6276 #ifndef SIG_IGN_WORKS
6277 while (waitpid(-1, NULL, WNOHANG) > 0);
6281 return_path = sender_address = NULL;
6282 authenticated_sender = NULL;
6283 deliver_localpart_orig = NULL;
6284 deliver_domain_orig = NULL;
6285 deliver_host = deliver_host_address = NULL;
6286 dnslist_domain = dnslist_matched = NULL;
6287 #ifdef WITH_CONTENT_SCAN
6288 malware_name = NULL;
6291 callout_address = NULL;
6292 sending_ip_address = NULL;
6293 deliver_localpart_data = deliver_domain_data =
6294 recipient_data = sender_data = NULL;
6296 lookup_value = NULL; /* Can be set by ACL */
6298 store_reset(reset_point);
6301 exim_exit(EXIT_SUCCESS); /* Never returns */
6302 return 0; /* To stop compiler warning */