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 if (isupper(big_buffer[0]))
1811 if (macro_read_assignment(big_buffer))
1812 printf("Defined macro '%s'\n", mlast->name);
1814 else if (Ustrncmp(big_buffer, "set,t ", 6) == 0)
1815 printf("%s\n", acl_standalone_setvar(big_buffer+6, TRUE));
1816 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1817 printf("%s\n", acl_standalone_setvar(big_buffer+4, FALSE));
1819 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1820 else printf("Failed: %s\n", expand_string_message);
1825 /*************************************************
1826 * Queue-runner operations *
1827 *************************************************/
1829 /* Prefix a new qrunner descriptor to the qrunners list */
1834 qrunner * q = qrunners;
1835 qrunners = store_get(sizeof(qrunner), GET_UNTAINTED);
1836 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1838 qrunners->next_tick = time(NULL); /* run right away */
1843 alloc_onetime_qrunner(void)
1845 qrunners = store_get_perm(sizeof(qrunner), GET_UNTAINTED);
1846 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1847 qrunners->next_tick = time(NULL); /* run right away */
1848 qrunners->run_max = 1;
1853 /*************************************************
1854 * Entry point and high-level code *
1855 *************************************************/
1857 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1858 the appropriate action. All the necessary functions are present in the one
1859 binary. I originally thought one should split it up, but it turns out that so
1860 much of the apparatus is needed in each chunk that one might as well just have
1861 it all available all the time, which then makes the coding easier as well.
1864 argc count of entries in argv
1865 argv argument strings, with argv[0] being the program name
1867 Returns: EXIT_SUCCESS if terminated successfully
1868 EXIT_FAILURE otherwise, except when a message has been sent
1869 to the sender, and -oee was given
1873 main(int argc, char ** cargv)
1875 const uschar ** argv = CUSS cargv;
1876 int arg_receive_timeout = -1;
1877 int arg_smtp_receive_timeout = -1;
1878 int arg_error_handling = error_handling;
1879 int filter_sfd = -1;
1880 int filter_ufd = -1;
1883 int list_queue_option = QL_BASIC;
1885 int msg_action_arg = -1;
1886 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1887 int queue_only_reason = 0;
1889 int perl_start_option = 0;
1891 int recipients_arg = argc;
1892 int sender_address_domain = 0;
1893 int test_retry_arg = -1;
1894 int test_rewrite_arg = -1;
1895 gid_t original_egid;
1896 BOOL arg_queue_only = FALSE;
1897 BOOL bi_option = FALSE;
1898 BOOL checking = FALSE;
1899 BOOL count_queue = FALSE;
1900 BOOL expansion_test = FALSE;
1901 BOOL extract_recipients = FALSE;
1902 BOOL flag_G = FALSE;
1903 BOOL flag_n = FALSE;
1904 BOOL forced_delivery = FALSE;
1905 BOOL f_end_dot = FALSE;
1906 BOOL deliver_give_up = FALSE;
1907 BOOL list_queue = FALSE;
1908 BOOL list_options = FALSE;
1909 BOOL list_config = FALSE;
1910 BOOL local_queue_only;
1911 BOOL one_msg_action = FALSE;
1912 BOOL opt_D_used = FALSE;
1913 BOOL queue_only_set = FALSE;
1914 BOOL receiving_message = TRUE;
1915 BOOL sender_ident_set = FALSE;
1916 BOOL session_local_queue_only;
1918 BOOL removed_privilege = FALSE;
1919 BOOL usage_wanted = FALSE;
1920 BOOL verify_address_mode = FALSE;
1921 BOOL verify_as_sender = FALSE;
1922 BOOL rcpt_verify_quota = FALSE;
1923 BOOL version_printed = FALSE;
1924 const uschar * alias_arg = NULL;
1925 const uschar * called_as = US"";
1926 const uschar * cmdline_syslog_name = NULL;
1927 const uschar * start_queue_run_id = NULL;
1928 const uschar * stop_queue_run_id = NULL;
1929 const uschar * expansion_test_message = NULL;
1930 const uschar * ftest_domain = NULL;
1931 const uschar * ftest_localpart = NULL;
1932 const uschar * ftest_prefix = NULL;
1933 const uschar * ftest_suffix = NULL;
1934 uschar * log_oneline = NULL;
1935 const uschar * malware_test_file = NULL;
1936 const uschar * real_sender_address;
1937 uschar * originator_home = US"/";
1941 struct stat statbuf;
1942 pid_t passed_qr_pid = (pid_t)0;
1943 int passed_qr_pipe = -1;
1944 gid_t group_list[EXIM_GROUPLIST_SIZE];
1946 /* For the -bI: flag */
1947 enum commandline_info info_flag = CMDINFO_NONE;
1948 BOOL info_stdout = FALSE;
1950 /* Possible options for -R and -S */
1952 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1954 /* Need to define this in case we need to change the environment in order
1955 to get rid of a bogus time zone. We have to make it char rather than uschar
1956 because some OS define it in /usr/include/unistd.h. */
1958 extern char **environ;
1960 #ifdef MEASURE_TIMING
1961 (void)gettimeofday(×tamp_startup, NULL);
1964 store_init(); /* Initialise the memory allocation susbsystem */
1965 pcre_init(); /* Set up memory handling for pcre */
1967 /* If the Exim user and/or group and/or the configuration file owner/group were
1968 defined by ref:name at build time, we must now find the actual uid/gid values.
1969 This is a feature to make the lives of binary distributors easier. */
1971 #ifdef EXIM_USERNAME
1972 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1975 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1977 /* If ref:name uses a number as the name, route_finduser() returns
1978 TRUE with exim_uid set and pw coerced to NULL. */
1980 exim_gid = pw->pw_gid;
1981 #ifndef EXIM_GROUPNAME
1984 "exim: ref:name should specify a usercode, not a group.\n"
1985 "exim: can't let you get away with it unless you also specify a group.\n");
1989 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1992 #ifdef EXIM_GROUPNAME
1993 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1994 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1997 #ifdef CONFIGURE_OWNERNAME
1998 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1999 exim_fail("exim: failed to find uid for user name \"%s\"\n",
2000 CONFIGURE_OWNERNAME);
2003 /* We default the system_filter_user to be the Exim run-time user, as a
2004 sane non-root value. */
2005 system_filter_uid = exim_uid;
2007 #ifdef CONFIGURE_GROUPNAME
2008 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
2009 exim_fail("exim: failed to find gid for group name \"%s\"\n",
2010 CONFIGURE_GROUPNAME);
2013 /* In the Cygwin environment, some initialization used to need doing.
2014 It was fudged in by means of this macro; now no longer but we'll leave
2015 it in case of others. */
2021 /* Check a field which is patched when we are running Exim within its
2022 testing harness; do a fast initial check, and then the whole thing. */
2024 f.running_in_test_harness =
2025 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
2026 if (f.running_in_test_harness)
2029 /* Protect against abusive argv[0] */
2030 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
2031 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
2033 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
2034 at the start of a program; however, it seems that some environments do not
2035 follow this. A "strange" locale can affect the formatting of timestamps, so we
2038 setlocale(LC_ALL, "C");
2040 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
2042 #ifdef _POSIX_MONOTONIC_CLOCK
2046 /* Set up the default handler for timing using alarm(). */
2048 os_non_restarting_signal(SIGALRM, sigalrm_handler);
2050 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
2051 because store_malloc writes a log entry on failure. */
2053 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
2054 exim_fail("exim: failed to get store for log buffer\n");
2056 /* Initialize the default log options. */
2058 bits_set(log_selector, log_selector_size, log_default);
2060 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
2061 NULL when the daemon is run and the file is closed. We have to use this
2062 indirection, because some systems don't allow writing to the variable "stderr".
2065 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
2067 /* Ensure there is a big buffer for temporary use in several places. It is put
2068 in malloc store so that it can be freed for enlargement if necessary. */
2070 big_buffer = store_malloc(big_buffer_size);
2072 /* Set up the handler for the data request signal, and set the initial
2073 descriptive text. */
2075 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
2076 set_process_info("initializing");
2077 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
2080 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
2081 sigaction(SIGSEGV, &act, NULL);
2084 signal(SIGSEGV, segv_handler); /* log faults */
2087 /* If running in a dockerized environment, the TERM signal is only
2088 delegated to the PID 1 if we request it by setting an signal handler */
2090 if (getpid() == 1) signal(SIGTERM, term_handler);
2092 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
2093 in the daemon code. For the rest of Exim's uses, we ignore it. */
2095 signal(SIGHUP, SIG_IGN);
2097 /* We don't want to die on pipe errors as the code is written to handle
2098 the write error instead. */
2100 signal(SIGPIPE, SIG_IGN);
2102 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
2103 set to SIG_IGN. This causes subprocesses that complete before the parent
2104 process waits for them not to hang around, so when Exim calls wait(), nothing
2105 is there. The wait() code has been made robust against this, but let's ensure
2106 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
2107 ending status. We use sigaction rather than plain signal() on those OS where
2108 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
2109 problem on AIX with this.) */
2113 struct sigaction act;
2114 act.sa_handler = SIG_DFL;
2115 sigemptyset(&(act.sa_mask));
2117 sigaction(SIGCHLD, &act, NULL);
2120 signal(SIGCHLD, SIG_DFL);
2123 /* Save the arguments for use if we re-exec exim as a daemon after receiving
2128 /* Set up the version number. Set up the leading 'E' for the external form of
2129 message ids, set the pointer to the internal form, and initialize it to
2130 indicate no message being processed. */
2133 message_id_option[0] = '-';
2134 message_id_external = message_id_option + 1;
2135 message_id_external[0] = 'E';
2136 message_id = message_id_external + 1;
2139 /* Set the umask to zero so that any files Exim creates using open() are
2140 created with the modes that it specifies. NOTE: Files created with fopen() have
2141 a problem, which was not recognized till rather late (February 2006). With this
2142 umask, such files will be world writeable. (They are all content scanning files
2143 in the spool directory, which isn't world-accessible, so this is not a
2144 disaster, but it's untidy.) I don't want to change this overall setting,
2145 however, because it will interact badly with the open() calls. Instead, there's
2146 now a function called modefopen() that fiddles with the umask while calling
2151 /* Precompile the regular expression for matching a message id. Keep this in
2152 step with the code that generates ids in the accept.c module. We need to do
2153 this here, because the -M options check their arguments for syntactic validity
2154 using mac_ismsgid, which uses this. */
2157 regex_must_compile(US"^(?:"
2158 "[^\\W_]{" str(MESSAGE_ID_TIME_LEN) "}"
2159 "-[^\\W_]{" str(MESSAGE_ID_PID_LEN) "}"
2160 "-[^\\W_]{" str(MESSAGE_ID_SUBTIME_LEN) "}"
2162 "(?:[^\\W_]{6}-){2}[^\\W_]{2}" /* old ID format */
2166 /* Precompile the regular expression that is used for matching an SMTP error
2167 code, possibly extended, at the start of an error message. Note that the
2168 terminating whitespace character is included. */
2171 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2174 #ifdef WHITELIST_D_MACROS
2175 /* Precompile the regular expression used to filter the content of macros
2176 given to -D for permissibility. */
2178 regex_whitelisted_macro =
2179 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2182 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2183 this seems to be a generally accepted convention, since one finds symbolic
2184 links called "mailq" in standard OS configurations. */
2186 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2187 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2190 receiving_message = FALSE;
2191 called_as = US"-mailq";
2194 /* If the program is called as "rmail" treat it as equivalent to
2195 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2196 i.e. preventing a single dot on a line from terminating the message, and
2197 returning with zero return code, even in cases of error (provided an error
2198 message has been sent). */
2200 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2201 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2204 called_as = US"-rmail";
2205 errors_sender_rc = EXIT_SUCCESS;
2208 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2209 this is a smail convention. */
2211 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2212 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2214 smtp_input = smtp_batched_input = TRUE;
2215 called_as = US"-rsmtp";
2218 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2219 this is a smail convention. */
2221 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2222 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2224 alloc_onetime_qrunner();
2225 receiving_message = FALSE;
2226 called_as = US"-runq";
2229 /* If the program is called as "newaliases" treat it as equivalent to
2230 "exim -bi"; this is a sendmail convention. */
2232 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2233 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2236 receiving_message = FALSE;
2237 called_as = US"-newaliases";
2240 /* Save the original effective uid for a couple of uses later. It should
2241 normally be root, but in some esoteric environments it may not be. */
2243 original_euid = geteuid();
2244 original_egid = getegid();
2246 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2247 to be the same as the real ones. This makes a difference only if Exim is setuid
2248 (or setgid) to something other than root, which could be the case in some
2249 special configurations. */
2251 real_uid = getuid();
2252 real_gid = getgid();
2254 if (real_uid == root_uid)
2256 if ((rv = setgid(real_gid)))
2257 exim_fail("exim: setgid(%ld) failed: %s\n",
2258 (long int)real_gid, strerror(errno));
2259 if ((rv = setuid(real_uid)))
2260 exim_fail("exim: setuid(%ld) failed: %s\n",
2261 (long int)real_uid, strerror(errno));
2264 /* If neither the original real uid nor the original euid was root, Exim is
2265 running in an unprivileged state. */
2267 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2269 /* For most of the args-parsing we need to use permanent pool memory */
2271 int old_pool = store_pool;
2272 store_pool = POOL_PERM;
2274 /* Scan the program's arguments. Some can be dealt with right away; others are
2275 simply recorded for checking and handling afterwards. Do a high-level switch
2276 on the second character (the one after '-'), to save some effort. */
2278 for (i = 1; i < argc; i++)
2280 BOOL badarg = FALSE;
2281 const uschar * arg = argv[i];
2282 const uschar * argrest;
2285 /* An argument not starting with '-' is the start of a recipients list;
2286 break out of the options-scanning loop. */
2294 /* An option consisting of -- terminates the options */
2296 if (Ustrcmp(arg, "--") == 0)
2298 recipients_arg = i + 1;
2302 /* Handle flagged options */
2304 switchchar = arg[1];
2307 /* Make all -ex options synonymous with -oex arguments, since that
2308 is assumed by various callers. Also make -qR options synonymous with -R
2309 options, as that seems to be required as well. Allow for -qqR too, and
2310 the same for -S options. */
2312 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2313 Ustrncmp(arg+1, "qR", 2) == 0 ||
2314 Ustrncmp(arg+1, "qS", 2) == 0)
2316 switchchar = arg[2];
2319 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2321 switchchar = arg[3];
2323 f.queue_2stage = TRUE;
2326 /* Make -r synonymous with -f, since it is a documented alias */
2328 else if (arg[1] == 'r') switchchar = 'f';
2330 /* Make -ov synonymous with -v */
2332 else if (Ustrcmp(arg, "-ov") == 0)
2338 /* deal with --option_aliases */
2339 else if (switchchar == '-')
2341 if (Ustrcmp(argrest, "help") == 0)
2343 usage_wanted = TRUE;
2346 else if (Ustrcmp(argrest, "version") == 0)
2353 /* High-level switch on active initial letter */
2358 /* sendmail uses -Ac and -Am to control which .cf file is used;
2361 if (!*argrest) { badarg = TRUE; break; }
2364 BOOL ignore = FALSE;
2369 if (*(argrest + 1) == '\0')
2373 if (!ignore) badarg = TRUE;
2377 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2378 so has no need of it. */
2381 if (!*argrest) i++; /* Skip over the type */
2387 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2391 /* -bd: Run in daemon mode, awaiting SMTP connections.
2392 -bdf: Ditto, but in the foreground.
2395 f.daemon_listen = f.daemon_scion = TRUE;
2396 if (*argrest == 'f') f.background_daemon = FALSE;
2397 else if (*argrest) badarg = TRUE;
2400 /* -be: Run in expansion test mode
2401 -bem: Ditto, but read a message from a file first
2404 expansion_test = checking = TRUE;
2405 if (*argrest == 'm')
2407 if (++i >= argc) { badarg = TRUE; break; }
2408 expansion_test_message = argv[i];
2411 if (*argrest) badarg = TRUE;
2414 /* -bF: Run system filter test */
2416 filter_test |= checking = FTEST_SYSTEM;
2417 if (*argrest) badarg = TRUE;
2418 else if (++i < argc) filter_test_sfile = argv[i];
2419 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2422 /* -bf: Run user filter test
2423 -bfd: Set domain for filter testing
2424 -bfl: Set local part for filter testing
2425 -bfp: Set prefix for filter testing
2426 -bfs: Set suffix for filter testing
2431 filter_test |= checking = FTEST_USER;
2432 if (++i < argc) filter_test_ufile = argv[i];
2433 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2438 exim_fail("exim: string expected after %s\n", arg);
2439 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2440 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2441 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2442 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2447 /* -bh: Host checking - an IP address must follow. */
2449 if ( (!*argrest || Ustrcmp(argrest, "c") == 0)
2452 sender_host_address = string_copy_taint(
2453 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2455 host_checking = checking = f.log_testing_mode = TRUE;
2456 f.host_checking_callout = *argrest == 'c';
2457 message_logs = FALSE;
2463 /* -bi: This option is used by sendmail to initialize *the* alias file,
2464 though it has the -oA option to specify a different file. Exim has no
2465 concept of *the* alias file, but since Sun's YP make script calls
2466 sendmail this way, some support must be provided. */
2468 if (!*argrest) bi_option = TRUE;
2472 /* -bI: provide information, of the type to follow after a colon.
2473 This is an Exim flag. */
2475 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2477 const uschar * p = argrest+1;
2478 info_flag = CMDINFO_HELP;
2480 if (strcmpic(p, CUS"sieve") == 0)
2482 info_flag = CMDINFO_SIEVE;
2485 else if (strcmpic(p, CUS"dscp") == 0)
2487 info_flag = CMDINFO_DSCP;
2490 else if (strcmpic(p, CUS"help") == 0)
2496 /* -bm: Accept and deliver message - the default option. Reinstate
2497 receiving_message, which got turned off for all -b options.
2498 -bmalware: test the filename given for malware */
2500 if (!*argrest) receiving_message = TRUE;
2501 else if (Ustrcmp(argrest, "alware") == 0)
2503 if (++i >= argc) { badarg = TRUE; break; }
2505 malware_test_file = argv[i];
2510 /* -bnq: For locally originating messages, do not qualify unqualified
2511 addresses. In the envelope, this causes errors; in header lines they
2514 if (Ustrcmp(argrest, "q") == 0)
2516 f.allow_unqualified_sender = FALSE;
2517 f.allow_unqualified_recipient = FALSE;
2522 /* -bpxx: List the contents of the mail queue, in various forms. If
2523 the option is -bpc, just a queue count is needed. Otherwise, if the
2524 first letter after p is r, then order is random. */
2526 if (*argrest == 'c')
2529 if (*++argrest) badarg = TRUE;
2533 if (*argrest == 'r')
2534 list_queue_option = QL_UNSORTED, argrest++;
2536 list_queue_option = QL_BASIC;
2540 /* -bp: List the contents of the mail queue, top-level only */
2544 /* -bpu: List the contents of the mail queue, top-level undelivered */
2546 else if (Ustrcmp(argrest, "u") == 0) list_queue_option |= QL_UNDELIVERED_ONLY;
2548 /* -bpa: List the contents of the mail queue, including all delivered */
2550 else if (Ustrcmp(argrest, "a") == 0) list_queue_option |= QL_PLUS_GENERATED;
2552 /* -bpi: List only message IDs */
2554 else if (Ustrcmp(argrest, "i") == 0) list_queue_option |= QL_MSGID_ONLY;
2556 /* Unknown after -bp[r] */
2562 /* -bP: List the configuration variables given as the address list.
2563 Force -v, so configuration errors get displayed. */
2566 /* -bP config: we need to setup here, because later,
2567 when list_options is checked, the config is read already */
2570 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2573 readconf_save_config(version_string);
2577 list_options = TRUE;
2578 debug_selector |= D_v;
2579 debug_file = stderr;
2583 /* -brt: Test retry configuration lookup */
2585 if (Ustrcmp(argrest, "t") == 0)
2588 test_retry_arg = i + 1;
2592 /* -brw: Test rewrite configuration */
2594 else if (Ustrcmp(argrest, "w") == 0)
2597 test_rewrite_arg = i + 1;
2603 /* -bS: Read SMTP commands on standard input, but produce no replies -
2604 all errors are reported by sending messages. */
2607 smtp_input = smtp_batched_input = receiving_message = TRUE;
2611 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2612 on standard output. */
2614 if (!*argrest) smtp_input = receiving_message = TRUE;
2618 /* -bt: address testing mode */
2621 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2625 /* -bv: verify addresses */
2628 verify_address_mode = checking = f.log_testing_mode = TRUE;
2630 /* -bvs: verify sender addresses */
2632 else if (Ustrcmp(argrest, "s") == 0)
2634 verify_address_mode = checking = f.log_testing_mode = TRUE;
2635 verify_as_sender = TRUE;
2640 /* -bV: Print version string and support details */
2644 printf("Exim version %s #%s built %s\n", version_string,
2645 version_cnumber, version_date);
2646 printf("%s\n", CS version_copyright);
2647 version_printed = TRUE;
2648 show_whats_supported(TRUE);
2649 f.log_testing_mode = TRUE;
2654 /* -bw: inetd wait mode, accept a listening socket as stdin */
2656 f.inetd_wait_mode = TRUE;
2657 f.background_daemon = FALSE;
2658 f.daemon_listen = f.daemon_scion = TRUE;
2660 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2661 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2672 /* -C: change configuration file list; ignore if it isn't really
2673 a change! Enforce a prefix check if required. */
2677 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2678 if (Ustrcmp(config_main_filelist, argrest) != 0)
2680 #ifdef ALT_CONFIG_PREFIX
2682 int len = Ustrlen(ALT_CONFIG_PREFIX);
2683 const uschar *list = argrest;
2685 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2686 while((filename = string_nextinlist(&list, &sep, big_buffer,
2688 if ( ( Ustrlen(filename) < len
2689 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2690 || Ustrstr(filename, "/../") != NULL
2692 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2694 exim_fail("-C Permission denied\n");
2696 if (real_uid != root_uid)
2698 #ifdef TRUSTED_CONFIG_LIST
2700 if (real_uid != exim_uid
2701 #ifdef CONFIGURE_OWNER
2702 && real_uid != config_uid
2705 f.trusted_config = FALSE;
2708 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2711 struct stat statbuf;
2713 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2714 (statbuf.st_uid != root_uid /* owner not root */
2715 #ifdef CONFIGURE_OWNER
2716 && statbuf.st_uid != config_uid /* owner not the special one */
2719 (statbuf.st_gid != root_gid /* group not root */
2720 #ifdef CONFIGURE_GROUP
2721 && statbuf.st_gid != config_gid /* group not the special one */
2723 && (statbuf.st_mode & 020) != 0 /* group writeable */
2725 (statbuf.st_mode & 2) != 0) /* world writeable */
2727 f.trusted_config = FALSE;
2732 /* Well, the trust list at least is up to scratch... */
2734 uschar *trusted_configs[32];
2737 int old_pool = store_pool;
2738 store_pool = POOL_MAIN;
2740 reset_point = store_mark();
2741 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2743 uschar * start = big_buffer, * nl;
2744 if (Uskip_whitespace(&start) != '/')
2746 if ((nl = Ustrchr(start, '\n')))
2748 trusted_configs[nr_configs++] = string_copy(start);
2749 if (nr_configs == nelem(trusted_configs))
2757 const uschar *list = argrest;
2759 while (f.trusted_config && (filename = string_nextinlist(&list,
2760 &sep, big_buffer, big_buffer_size)))
2762 for (i=0; i < nr_configs; i++)
2763 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2765 if (i == nr_configs)
2767 f.trusted_config = FALSE;
2772 else /* No valid prefixes found in trust_list file. */
2773 f.trusted_config = FALSE;
2774 store_reset(reset_point);
2775 store_pool = old_pool;
2778 else /* Could not open trust_list file. */
2779 f.trusted_config = FALSE;
2782 /* Not root; don't trust config */
2783 f.trusted_config = FALSE;
2787 config_main_filelist = argrest;
2788 f.config_changed = TRUE;
2793 /* -D: set up a macro definition */
2796 #ifdef DISABLE_D_OPTION
2797 exim_fail("exim: -D is not available in this Exim binary\n");
2803 const uschar * s = argrest;
2806 Uskip_whitespace(&s);
2808 if (*s < 'A' || *s > 'Z')
2809 exim_fail("exim: macro name set by -D must start with "
2810 "an upper case letter\n");
2812 while (isalnum(*s) || *s == '_')
2814 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2818 if (ptr == 0) { badarg = TRUE; break; }
2819 if (Uskip_whitespace(&s))
2821 if (*s++ != '=') { badarg = TRUE; break; }
2822 Uskip_whitespace(&s);
2825 for (m = macros_user; m; m = m->next)
2826 if (Ustrcmp(m->name, name) == 0)
2827 exim_fail("exim: duplicated -D in command line\n");
2829 m = macro_create(name, s, TRUE);
2831 if (clmacro_count >= MAX_CLMACROS)
2832 exim_fail("exim: too many -D options on command line\n");
2833 clmacros[clmacro_count++] =
2834 string_sprintf("-D%s=%s", m->name, m->replacement);
2841 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2843 if (Ustrcmp(argrest, "ropcr") == 0)
2845 /* drop_cr = TRUE; */
2848 /* -dp: Set up a debug pretrigger buffer with given size. */
2850 else if (Ustrcmp(argrest, "p") == 0)
2854 debug_pretrigger_setup(argv[i]);
2856 /* -dt: Set a debug trigger selector */
2858 else if (Ustrncmp(argrest, "t=", 2) == 0)
2859 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2861 /* -d: Set debug level (see also -v below).
2862 If -dd is used, debugging subprocesses of the daemon is disabled. */
2866 /* Use an intermediate variable so that we don't set debugging while
2867 decoding the debugging bits. */
2869 unsigned int selector = D_default;
2872 if (*argrest == 'd')
2874 f.debug_daemon = TRUE;
2878 decode_bits(&selector, 1, debug_notall, argrest,
2879 debug_options, debug_options_count, US"debug", 0);
2880 debug_selector = selector;
2885 /* -E: This is a local error message. This option is not intended for
2886 external use at all, but is not restricted to trusted callers because it
2887 does no harm (just suppresses certain error messages) and if Exim is run
2888 not setuid root it won't always be trusted when it generates error
2889 messages using this option. If there is a message id following -E, point
2890 message_reference at it, for logging. */
2893 f.local_error_message = TRUE;
2894 if (mac_ismsgid(argrest)) message_reference = argrest;
2898 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2899 option, so it looks as if historically the -oex options are also callable
2900 without the leading -o. So we have to accept them. Before the switch,
2901 anything starting -oe has been converted to -e. Exim does not support all
2902 of the sendmail error options. */
2905 if (Ustrcmp(argrest, "e") == 0)
2907 arg_error_handling = ERRORS_SENDER;
2908 errors_sender_rc = EXIT_SUCCESS;
2910 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2911 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2912 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2913 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2918 /* -F: Set sender's full name, used instead of the gecos entry from
2919 the password file. Since users can usually alter their gecos entries,
2920 there's no security involved in using this instead. The data can follow
2921 the -F or be in the next argument. */
2925 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2926 originator_name = string_copy_taint(
2927 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2929 f.sender_name_forced = TRUE;
2933 /* -f: Set sender's address - this value is only actually used if Exim is
2934 run by a trusted user, or if untrusted_set_sender is set and matches the
2935 address, except that the null address can always be set by any user. The
2936 test for this happens later, when the value given here is ignored when not
2937 permitted. For an untrusted user, the actual sender is still put in Sender:
2938 if it doesn't match the From: header (unless no_local_from_check is set).
2939 The data can follow the -f or be in the next argument. The -r switch is an
2940 obsolete form of -f but since there appear to be programs out there that
2941 use anything that sendmail has ever supported, better accept it - the
2942 synonymizing is done before the switch above.
2944 At this stage, we must allow domain literal addresses, because we don't
2945 know what the setting of allow_domain_literals is yet. Ditto for trailing
2946 dots and strip_trailing_dot. */
2950 int dummy_start, dummy_end;
2953 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2954 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2957 uschar * s = store_get(1, GET_UNTAINTED); /* Ensure writeable memory */
2963 const uschar * temp = argrest + Ustrlen(argrest) - 1;
2964 while (temp >= argrest && isspace(*temp)) temp--;
2965 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2966 allow_domain_literals = TRUE;
2967 strip_trailing_dot = TRUE;
2969 allow_utf8_domains = TRUE;
2971 if (!(sender_address = parse_extract_address(argrest, &errmess,
2972 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2973 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2975 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2977 message_smtputf8 = string_is_utf8(sender_address);
2978 allow_utf8_domains = FALSE;
2980 allow_domain_literals = FALSE;
2981 strip_trailing_dot = FALSE;
2983 f.sender_address_forced = TRUE;
2987 /* -G: sendmail invocation to specify that it's a gateway submission and
2988 sendmail may complain about problems instead of fixing them.
2989 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2990 not at this time complain about problems. */
2996 /* -h: Set the hop count for an incoming message. Exim does not currently
2997 support this; it always computes it by counting the Received: headers.
2998 To put it in will require a change to the spool header file format. */
3002 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3003 if (!isdigit(*argrest)) badarg = TRUE;
3007 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
3008 not to be documented for sendmail but mailx (at least) uses it) */
3011 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
3015 /* -L: set the identifier used for syslog; equivalent to setting
3016 syslog_processname in the config file, but needs to be an admin option. */
3020 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
3021 if ((sz = Ustrlen(argrest)) > 32)
3022 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
3024 exim_fail("exim: the -L syslog name is too short\n");
3025 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
3029 receiving_message = FALSE;
3031 /* -MC: continue delivery of another message via an existing open
3032 file descriptor. This option is used for an internal call by the
3033 smtp transport when there is a pending message waiting to go to an
3034 address to which it has got a connection. Five subsequent arguments are
3035 required: transport name, host name, IP address, sequence number, and
3036 message_id. Transports may decline to create new processes if the sequence
3037 number gets too big. The channel is stdin. This (-MC) must be the last
3038 argument. There's a subsequent check that the real-uid is privileged.
3040 If we are running in the test harness. delay for a bit, to let the process
3041 that set this one up complete. This makes for repeatability of the logging,
3044 if (Ustrcmp(argrest, "C") == 0)
3046 union sockaddr_46 interface_sock;
3047 EXIM_SOCKLEN_T size = sizeof(interface_sock);
3050 exim_fail("exim: too many or too few arguments after -MC\n");
3052 if (msg_action_arg >= 0)
3053 exim_fail("exim: incompatible arguments\n");
3055 continue_transport = string_copy_taint(
3056 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
3058 continue_hostname = string_copy_taint(
3059 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
3061 continue_host_address = string_copy_taint(
3062 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
3064 continue_sequence = Uatoi(argv[++i]);
3065 msg_action = MSG_DELIVER;
3066 msg_action_arg = ++i;
3067 forced_delivery = TRUE;
3068 queue_run_pid = passed_qr_pid;
3069 queue_run_pipe = passed_qr_pipe;
3071 if (!mac_ismsgid(argv[i]))
3072 exim_fail("exim: malformed message id %s after -MC option\n",
3075 /* Set up $sending_ip_address and $sending_port, unless proxied */
3077 if (!continue_proxy_cipher)
3078 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
3080 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
3083 exim_fail("exim: getsockname() failed after -MC option: %s\n",
3086 testharness_pause_ms(500);
3090 else if (*argrest == 'C' && argrest[1] && !argrest[2])
3094 /* -MCA: set the smtp_authenticated flag; this is useful only when it
3095 precedes -MC (see above). The flag indicates that the host to which
3096 Exim is connected has accepted an AUTH sequence. */
3098 case 'A': f.smtp_authenticated = TRUE; break;
3100 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
3101 that exim is connected to supports the esmtp extension DSN */
3103 case 'D': smtp_peer_options |= OPTION_DSN; break;
3105 /* -MCd: for debug, set a process-purpose string */
3107 case 'd': if (++i < argc)
3108 process_purpose = string_copy_taint(
3109 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
3114 /* -MCG: set the queue name, to a non-default value. Arguably, anything
3115 from the commandline should be tainted - but we will need an untainted
3116 value for the spoolfile when doing a -odi delivery process. */
3118 case 'G': if (++i < argc) queue_name = string_copy_taint(
3119 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
3124 /* -MCK: the peer offered CHUNKING. Must precede -MC */
3126 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
3128 #ifndef DISABLE_ESMTP_LIMITS
3129 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
3130 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
3132 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
3134 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
3139 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
3140 it preceded -MC (see above) */
3142 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3144 #ifdef SUPPORT_SOCKS
3145 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3146 case 'p': proxy_session = TRUE;
3149 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3152 proxy_local_port = Uatoi(argv[i]);
3155 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3158 proxy_external_port = Uatoi(argv[i]);
3164 /* -MCQ: pass on the pid of the queue-running process that started
3165 this chain of deliveries and the fd of its synchronizing pipe; this
3166 is useful only when it precedes -MC (see above) */
3168 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3170 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3174 /* -MCq: do a quota check on the given recipient for the given size
3175 of message. Separate from -MC. */
3176 case 'q': rcpt_verify_quota = TRUE;
3177 if (++i < argc) message_size = Uatoi(argv[i]);
3181 /* -MCS: set the smtp_use_size flag; this is useful only when it
3182 precedes -MC (see above) */
3184 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3187 /* -MCs: used with -MCt; SNI was sent */
3188 /* -MCr: ditto, DANE */
3191 case 's': if (++i < argc)
3193 continue_proxy_sni = string_copy_taint(
3194 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3196 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3201 /* -MCt: similar to -MCT below but the connection is still open
3202 via a proxy process which handles the TLS context and coding.
3203 Require three arguments for the proxied local address and port,
3204 and the TLS cipher. */
3206 case 't': if (++i < argc)
3207 sending_ip_address = string_copy_taint(
3208 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3212 sending_port = (int)(Uatol(argv[i]));
3215 continue_proxy_cipher = string_copy_taint(
3216 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3221 /* -MCT: set the tls_offered flag; this is useful only when it
3222 precedes -MC (see above). The flag indicates that the host to which
3223 Exim is connected has offered TLS support. */
3225 case 'T': smtp_peer_options |= OPTION_TLS; break;
3228 default: badarg = TRUE; break;
3233 /* -M[x]: various operations on the following list of message ids:
3234 -M deliver the messages, ignoring next retry times and thawing
3235 -Mc deliver the messages, checking next retry times, no thawing
3236 -Mf freeze the messages
3237 -Mg give up on the messages
3238 -Mt thaw the messages
3239 -Mrm remove the messages
3240 In the above cases, this must be the last option. There are also the
3241 following options which are followed by a single message id, and which
3242 act on that message. Some of them use the "recipient" addresses as well.
3243 -Mar add recipient(s)
3244 -MG move to a different queue
3245 -Mmad mark all recipients delivered
3246 -Mmd mark recipients(s) delivered
3248 -Mset load a message for use with -be
3250 -Mvc show copy (of whole message, in RFC 2822 format)
3257 msg_action = MSG_DELIVER;
3258 forced_delivery = f.deliver_force_thaw = TRUE;
3260 else if (Ustrcmp(argrest, "ar") == 0)
3262 msg_action = MSG_ADD_RECIPIENT;
3263 one_msg_action = TRUE;
3265 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3266 else if (Ustrcmp(argrest, "es") == 0)
3268 msg_action = MSG_EDIT_SENDER;
3269 one_msg_action = TRUE;
3271 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3272 else if (Ustrcmp(argrest, "g") == 0)
3274 msg_action = MSG_DELIVER;
3275 deliver_give_up = TRUE;
3277 else if (Ustrcmp(argrest, "G") == 0)
3279 msg_action = MSG_SETQUEUE;
3280 queue_name_dest = string_copy_taint(
3281 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3282 EXIM_DRIVERNAME_MAX, "-MG"),
3285 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3286 else if (Ustrcmp(argrest, "md") == 0)
3288 msg_action = MSG_MARK_DELIVERED;
3289 one_msg_action = TRUE;
3291 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3292 else if (Ustrcmp(argrest, "set") == 0)
3294 msg_action = MSG_LOAD;
3295 one_msg_action = TRUE;
3297 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3298 else if (Ustrcmp(argrest, "vb") == 0)
3300 msg_action = MSG_SHOW_BODY;
3301 one_msg_action = TRUE;
3303 else if (Ustrcmp(argrest, "vc") == 0)
3305 msg_action = MSG_SHOW_COPY;
3306 one_msg_action = TRUE;
3308 else if (Ustrcmp(argrest, "vh") == 0)
3310 msg_action = MSG_SHOW_HEADER;
3311 one_msg_action = TRUE;
3313 else if (Ustrcmp(argrest, "vl") == 0)
3315 msg_action = MSG_SHOW_LOG;
3316 one_msg_action = TRUE;
3318 else { badarg = TRUE; break; }
3320 /* All the -Mxx options require at least one message id. */
3322 msg_action_arg = i + 1;
3323 if (msg_action_arg >= argc)
3324 exim_fail("exim: no message ids given after %s option\n", arg);
3326 /* Some require only message ids to follow */
3328 if (!one_msg_action)
3330 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3331 exim_fail("exim: malformed message id %s after %s option\n",
3333 goto END_ARG; /* Remaining args are ids */
3336 /* Others require only one message id, possibly followed by addresses,
3337 which will be handled as normal arguments. */
3341 if (!mac_ismsgid(argv[msg_action_arg]))
3342 exim_fail("exim: malformed message id %s after %s option\n",
3343 argv[msg_action_arg], arg);
3349 /* Some programs seem to call the -om option without the leading o;
3350 for sendmail it askes for "me too". Exim always does this. */
3353 if (*argrest) badarg = TRUE;
3357 /* -N: don't do delivery - a debugging option that stops transports doing
3358 their thing. It implies debugging at the D_v level. */
3363 f.dont_deliver = TRUE;
3364 debug_selector |= D_v;
3365 debug_file = stderr;
3371 /* -n: This means "don't alias" in sendmail, apparently.
3372 For normal invocations, it has no effect.
3373 It may affect some other options. */
3379 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3380 option to the specified value. This form uses long names. We need to handle
3381 -O option=value and -Ooption=value. */
3386 exim_fail("exim: string expected after -O\n");
3392 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3395 if (!*(alias_arg = argrest))
3396 if (i+1 < argc) alias_arg = argv[++i];
3397 else exim_fail("exim: string expected after -oA\n");
3400 /* -oB: Set a connection message max value for remote deliveries */
3403 const uschar * p = argrest;
3405 if (i+1 < argc && isdigit((argv[i+1][0])))
3409 connection_max_messages = 1;
3416 exim_fail("exim: number expected after -oB\n");
3417 connection_max_messages = Uatoi(p);
3422 /* -odb: background delivery */
3425 if (Ustrcmp(argrest, "b") == 0)
3427 f.synchronous_delivery = FALSE;
3428 arg_queue_only = FALSE;
3429 queue_only_set = TRUE;
3432 /* -odd: testsuite-only: add no inter-process delays */
3434 else if (Ustrcmp(argrest, "d") == 0)
3435 f.testsuite_delays = FALSE;
3437 /* -odf: foreground delivery (smail-compatible option); same effect as
3438 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3441 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3443 f.synchronous_delivery = TRUE;
3444 arg_queue_only = FALSE;
3445 queue_only_set = TRUE;
3448 /* -odq: queue only */
3450 else if (Ustrcmp(argrest, "q") == 0)
3452 f.synchronous_delivery = FALSE;
3453 arg_queue_only = TRUE;
3454 queue_only_set = TRUE;
3457 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3458 but no remote delivery */
3460 else if (Ustrcmp(argrest, "qs") == 0)
3462 f.queue_smtp = TRUE;
3463 arg_queue_only = FALSE;
3464 queue_only_set = TRUE;
3469 /* -oex: Sendmail error flags. As these are also accepted without the
3470 leading -o prefix, for compatibility with vacation and other callers,
3471 they are handled with -e above. */
3473 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3474 -oitrue: Another sendmail syntax for the same */
3477 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3482 /* -oM*: Set various characteristics for an incoming message; actually
3483 acted on for trusted callers only. */
3488 exim_fail("exim: data expected after -oM%s\n", argrest);
3490 /* -oMa: Set sender host address */
3492 if (Ustrcmp(argrest, "a") == 0)
3493 sender_host_address = string_copy_taint(
3494 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3495 EXIM_IPADDR_MAX, "-oMa"), GET_TAINTED);
3497 /* -oMaa: Set authenticator name */
3499 else if (Ustrcmp(argrest, "aa") == 0)
3500 sender_host_authenticated = string_copy_taint(
3501 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3502 EXIM_DRIVERNAME_MAX, "-oMaa"), GET_TAINTED);
3504 /* -oMas: setting authenticated sender */
3506 else if (Ustrcmp(argrest, "as") == 0)
3507 authenticated_sender = string_copy_taint(
3508 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3509 EXIM_EMAILADDR_MAX, "-oMas"), GET_TAINTED);
3511 /* -oMai: setting authenticated id */
3513 else if (Ustrcmp(argrest, "ai") == 0)
3514 authenticated_id = string_copy_taint(
3515 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3516 EXIM_EMAILADDR_MAX, "-oMai"), GET_TAINTED);
3518 /* -oMi: Set incoming interface address */
3520 else if (Ustrcmp(argrest, "i") == 0)
3521 interface_address = string_copy_taint(
3522 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3523 EXIM_IPADDR_MAX, "-oMi"), GET_TAINTED);
3525 /* -oMm: Message reference */
3527 else if (Ustrcmp(argrest, "m") == 0)
3529 if (!mac_ismsgid(argv[i+1]))
3530 exim_fail("-oMm must be a valid message ID\n");
3531 if (!f.trusted_config)
3532 exim_fail("-oMm must be called by a trusted user/config\n");
3533 message_reference = next_argv(argv, &i, argc, arg);
3536 /* -oMr: Received protocol */
3538 else if (Ustrcmp(argrest, "r") == 0)
3540 if (received_protocol)
3541 exim_fail("received_protocol is set already\n");
3543 if (++i >= argc) badarg = TRUE;
3545 received_protocol = string_copy_taint(
3546 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-oMr"),
3549 /* -oMs: Set sender host name */
3551 else if (Ustrcmp(argrest, "s") == 0)
3552 if (++i >= argc) badarg = TRUE;
3554 sender_host_name = string_copy_taint(
3555 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-oMs"),
3558 /* -oMt: Set sender ident */
3560 else if (Ustrcmp(argrest, "t") == 0)
3561 if (++i >= argc) badarg = TRUE;
3564 sender_ident_set = TRUE;
3565 sender_ident = string_copy_taint(
3566 exim_str_fail_toolong(argv[i], EXIM_IDENTUSER_MAX, "-oMt"),
3570 /* Else a bad argument */
3577 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3578 seem to call this as -m (undocumented), so that is also accepted (see
3580 /* -oo: An ancient flag for old-style addresses which still seems to
3581 crop up in some calls (see in SCO). */
3585 if (*argrest) badarg = TRUE;
3588 /* -oP <name>: set pid file path for daemon
3589 -oPX: delete pid file of daemon */
3592 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3593 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3594 "(uid=%d euid=%d | %d)\n",
3595 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3597 if (++i < argc) override_pid_file_path = argv[i];
3599 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3604 /* -or <n>: set timeout for non-SMTP acceptance
3605 -os <n>: set timeout for SMTP acceptance */
3610 int * tp = argrest[-1] == 'r'
3611 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3613 *tp = readconf_readtime(argrest, 0, FALSE);
3614 else if (i+1 < argc)
3615 *tp = readconf_readtime(argv[++i], 0, FALSE);
3618 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3622 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3623 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3626 if (*argrest || ++i >= argc) badarg = TRUE;
3627 else override_local_interfaces = string_copy_taint(
3628 exim_str_fail_toolong(argv[i], 1024, "-oX"), GET_TAINTED);
3631 /* -oY: Override creation of daemon notifier socket */
3634 if (*argrest) badarg = TRUE;
3635 else f.notifier_socket_en = FALSE;
3638 /* Unknown -o argument */
3646 /* -ps: force Perl startup; -pd force delayed Perl startup */
3650 if (*argrest == 's' && argrest[1] == 0)
3652 perl_start_option = 1;
3655 if (*argrest == 'd' && argrest[1] == 0)
3657 perl_start_option = -1;
3662 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3663 which sets the host protocol and host name */
3666 argrest = next_argv(argv, &i, argc, arg);
3670 uschar * hn = Ustrchr(argrest, ':');
3672 if (received_protocol)
3673 exim_fail("received_protocol is set already\n");
3676 received_protocol = string_copy_taint(
3677 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3681 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3682 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3683 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3688 /* -q: set up queue runs */
3692 BOOL two_stage, first_del, force, thaw = FALSE, local;
3694 receiving_message = FALSE;
3696 /* -qq...: Do queue runs in a 2-stage manner */
3698 if ((two_stage = *argrest == 'q'))
3701 /* -qi...: Do only first (initial) deliveries */
3703 if ((first_del = *argrest == 'i'))
3706 /* -qf...: Run the queue, forcing deliveries
3707 -qff..: Ditto, forcing thawing as well */
3709 if ((force = *argrest == 'f'))
3710 if ((thaw = *++argrest == 'f'))
3713 /* -q[f][f]l...: Run the queue only on local deliveries */
3715 if ((local = *argrest == 'l'))
3718 /* -q[f][f][l][G<name>]... Work on the named queue */
3720 if (*argrest == 'G')
3723 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3724 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3725 queue_name = string_copyn(argrest, i);
3727 if (*argrest == '/') argrest++;
3730 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3731 only, optionally named, optionally starting from a given message id. */
3733 if (!(list_queue || count_queue))
3738 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3740 q = alloc_onetime_qrunner();
3741 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3742 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3743 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3744 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3747 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3748 forced, optionally local only, optionally named. */
3755 if (*argrest) s = argrest;
3756 else if (++i < argc) { badarg = TRUE; break; }
3759 if ((intvl = readconf_readtime(s, 0, FALSE)) <= 0)
3760 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3762 for (qrunner * qq = qrunners; qq; qq = qq->next)
3763 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3764 || !queue_name && !qq->name)
3765 exim_fail("exim: queue-runner specified more than once\n");
3767 q = alloc_qrunner();
3768 q->interval = intvl;
3771 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3772 q->queue_run_force = force;
3773 q->deliver_force_thaw = thaw;
3774 q->queue_run_first_delivery = first_del;
3775 q->queue_run_local = local;
3776 q->queue_2stage = two_stage;
3783 case 'R': /* Synonymous with -qR... */
3784 case 'S': /* Synonymous with -qS... */
3786 const uschar * tainted_selectstr;
3789 receiving_message = FALSE;
3791 /* -Rf: As -R (below) but force all deliveries,
3792 -Rff: Ditto, but also thaw all frozen messages,
3793 -Rr: String is regex
3794 -Rrf: Regex and force
3795 -Rrff: Regex and force and thaw
3797 -S...: Like -R but works on sender.
3799 in all cases provided there are no further characters in this
3802 if (!qrunners) alloc_onetime_qrunner();
3803 qrunners->queue_2stage = f.queue_2stage;
3805 for (int i = 0; i < nelem(rsopts); i++)
3806 if (Ustrcmp(argrest, rsopts[i]) == 0)
3808 if (i != 2) qrunners->queue_run_force = TRUE;
3810 if (switchchar == 'R')
3811 f.deliver_selectstring_regex = TRUE;
3813 f.deliver_selectstring_sender_regex = TRUE;
3814 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3815 argrest += Ustrlen(rsopts[i]);
3818 /* -R or -S: Set string to match in addresses for forced queue run to
3819 pick out particular messages. */
3821 /* Avoid attacks from people providing very long strings, and do so before
3824 tainted_selectstr = argrest;
3825 else if (i+1 < argc)
3826 tainted_selectstr = argv[++i];
3828 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3830 s = string_copy_taint(
3831 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3834 if (switchchar == 'R')
3835 deliver_selectstring = s;
3837 deliver_selectstring_sender = s;
3842 /* -r: an obsolete synonym for -f (see above) */
3844 /* -Tqt is an option that is exclusively for use by the testing suite.
3845 It is not recognized in other circumstances. It allows for the setting up
3846 of explicit "queue times" so that various warning/retry things can be
3847 tested. Otherwise variability of clock ticks etc. cause problems. */
3850 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0 && ++i < argc)
3851 fudged_queue_times = string_copy_taint(argv[i], GET_TAINTED);
3856 /* -t: Set flag to extract recipients from body of message. */
3859 if (!*argrest) extract_recipients = TRUE;
3861 /* -ti: Set flag to extract recipients from body of message, and also
3862 specify that dot does not end the message. */
3864 else if (Ustrcmp(argrest, "i") == 0)
3866 extract_recipients = TRUE;
3870 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3873 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3880 /* -U: This means "initial user submission" in sendmail, apparently. The
3881 doc claims that in future sendmail may refuse syntactically invalid
3882 messages instead of fixing them. For the moment, we just ignore it. */
3888 /* -v: verify things - this is a very low-level debugging */
3893 debug_selector |= D_v;
3894 debug_file = stderr;
3900 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3902 The -x flag tells the sendmail command that mail from a local
3903 mail program has National Language Support (NLS) extended characters
3904 in the body of the mail item. The sendmail command can send mail with
3905 extended NLS characters across networks that normally corrupts these
3908 As Exim is 8-bit clean, it just ignores this flag. */
3911 if (*argrest) badarg = TRUE;
3914 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3915 logs to that file. We swallow the parameter and otherwise ignore it. */
3920 exim_fail("exim: string expected after -X\n");
3923 /* -z: a line of text to log */
3928 log_oneline = string_copy_taint(
3929 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3932 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3935 /* All other initial characters are errors */
3940 } /* End of high-level switch statement */
3942 /* Failed to recognize the option, or syntax error */
3945 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3946 "option %s\n", arg);
3950 /* If -R or -S have been specified without -q, assume a single queue run. */
3952 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3953 alloc_onetime_qrunner();
3957 store_pool = old_pool;
3960 /* If usage_wanted is set we call the usage function - which never returns */
3961 if (usage_wanted) exim_usage(called_as);
3963 /* Arguments have been processed. Check for incompatibilities. */
3964 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3965 && ( f.daemon_listen || qrunners || bi_option
3966 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3967 || filter_test != FTEST_NONE
3968 || msg_action_arg > 0 && !one_msg_action
3970 || ( msg_action_arg > 0
3971 && ( f.daemon_listen || is_multiple_qrun() || list_options
3972 || checking && msg_action != MSG_LOAD
3973 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3975 || ( (f.daemon_listen || is_multiple_qrun())
3976 && ( sender_address || list_options || list_queue || checking
3979 || f.daemon_listen && is_onetime_qrun()
3980 || f.inetd_wait_mode && qrunners
3982 && ( checking || smtp_input || extract_recipients
3983 || filter_test != FTEST_NONE || bi_option
3985 || ( verify_address_mode
3986 && ( f.address_test_mode || smtp_input || extract_recipients
3987 || filter_test != FTEST_NONE || bi_option
3989 || ( f.address_test_mode
3990 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3994 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3996 || deliver_selectstring && !qrunners
3997 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3999 exim_fail("exim: incompatible command-line options or arguments\n");
4001 /* If debugging is set up, set the file and the file descriptor to pass on to
4002 child processes. It should, of course, be 2 for stderr. Also, force the daemon
4003 to run in the foreground. */
4005 if (debug_selector != 0)
4007 debug_file = stderr;
4008 debug_fd = fileno(debug_file);
4009 f.background_daemon = FALSE;
4010 testharness_pause_ms(100); /* lets caller finish */
4011 if (debug_selector != D_v) /* -v only doesn't show this */
4013 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
4014 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
4016 if (!version_printed)
4017 show_whats_supported(FALSE);
4021 /* When started with root privilege, ensure that the limits on the number of
4022 open files and the number of processes (where that is accessible) are
4023 sufficiently large, or are unset, in case Exim has been called from an
4024 environment where the limits are screwed down. Not all OS have the ability to
4025 change some of these limits. */
4029 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
4035 #ifdef RLIMIT_NOFILE
4036 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
4038 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
4040 rlp.rlim_cur = rlp.rlim_max = 0;
4043 /* I originally chose 1000 as a nice big number that was unlikely to
4044 be exceeded. It turns out that some older OS have a fixed upper limit of
4047 if (rlp.rlim_cur < 1000)
4049 rlp.rlim_cur = rlp.rlim_max = 1000;
4050 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4052 rlp.rlim_cur = rlp.rlim_max = 256;
4053 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
4054 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
4061 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
4063 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
4065 rlp.rlim_cur = rlp.rlim_max = 0;
4068 # ifdef RLIM_INFINITY
4069 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
4071 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
4073 if (rlp.rlim_cur < 1000)
4075 rlp.rlim_cur = rlp.rlim_max = 1000;
4077 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
4078 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
4084 /* Exim is normally entered as root (but some special configurations are
4085 possible that don't do this). However, it always spins off sub-processes that
4086 set their uid and gid as required for local delivery. We don't want to pass on
4087 any extra groups that root may belong to, so we want to get rid of them all at
4090 We need to obey setgroups() at this stage, before possibly giving up root
4091 privilege for a changed configuration file, but later on we might need to
4092 check on the additional groups for the admin user privilege - can't do that
4093 till after reading the config, which might specify the exim gid. Therefore,
4094 save the group list here first. */
4096 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
4097 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
4099 /* There is a fundamental difference in some BSD systems in the matter of
4100 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
4101 known not to be different. On the "different" systems there is a single group
4102 list, and the first entry in it is the current group. On all other versions of
4103 Unix there is a supplementary group list, which is in *addition* to the current
4104 group. Consequently, to get rid of all extraneous groups on a "standard" system
4105 you pass over 0 groups to setgroups(), while on a "different" system you pass
4106 over a single group - the current group, which is always the first group in the
4107 list. Calling setgroups() with zero groups on a "different" system results in
4108 an error return. The following code should cope with both types of system.
4110 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
4111 the "setgroups() with zero groups" - and changes the egid.
4112 Thanks to that we had to stash the original_egid above, for use below
4113 in the call to exim_setugid().
4115 However, if this process isn't running as root, setgroups() can't be used
4116 since you have to be root to run it, even if throwing away groups.
4117 Except, sigh, for Hurd - where you can.
4118 Not being root here happens only in some unusual configurations. */
4121 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
4122 && setgroups(0, NULL) != 0
4124 && setgroups(1, group_list) != 0)
4125 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
4127 /* If the configuration file name has been altered by an argument on the
4128 command line (either a new file name or a macro definition) and the caller is
4129 not root, or if this is a filter testing run, remove any setuid privilege the
4130 program has and run as the underlying user.
4132 The exim user is locked out of this, which severely restricts the use of -C
4135 Otherwise, set the real ids to the effective values (should be root unless run
4136 from inetd, which it can either be root or the exim uid, if one is configured).
4138 There is a private mechanism for bypassing some of this, in order to make it
4139 possible to test lots of configurations automatically, without having either to
4140 recompile each time, or to patch in an actual configuration file name and other
4141 values (such as the path name). If running in the test harness, pretend that
4142 configuration file changes and macro definitions haven't happened. */
4145 (!f.trusted_config || /* Config changed, or */
4146 !macros_trusted(opt_D_used)) && /* impermissible macros and */
4147 real_uid != root_uid && /* Not root, and */
4148 !f.running_in_test_harness /* Not fudged */
4150 expansion_test /* expansion testing */
4152 filter_test != FTEST_NONE) /* Filter testing */
4154 setgroups(group_count, group_list);
4155 exim_setugid(real_uid, real_gid, FALSE,
4156 US"-C, -D, -be or -bf forces real uid");
4157 removed_privilege = TRUE;
4159 /* In the normal case when Exim is called like this, stderr is available
4160 and should be used for any logging information because attempts to write
4161 to the log will usually fail. To arrange this, we unset really_exim. However,
4162 if no stderr is available there is no point - we might as well have a go
4163 at the log (if it fails, syslog will be written).
4165 Note that if the invoker is Exim, the logs remain available. Messing with
4166 this causes unlogged successful deliveries. */
4168 if (log_stderr && real_uid != exim_uid)
4169 f.really_exim = FALSE;
4172 /* Privilege is to be retained for the moment. It may be dropped later,
4173 depending on the job that this Exim process has been asked to do. For now, set
4174 the real uid to the effective so that subsequent re-execs of Exim are done by a
4178 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4180 /* If testing a filter, open the file(s) now, before wasting time doing other
4181 setups and reading the message. */
4183 if (filter_test & FTEST_SYSTEM)
4184 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4185 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4188 if (filter_test & FTEST_USER)
4189 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4190 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4193 /* Initialise lookup_list
4194 If debugging, already called above via version reporting.
4195 In either case, we initialise the list of available lookups while running
4196 as root. All dynamically modules are loaded from a directory which is
4197 hard-coded into the binary and is code which, if not a module, would be
4198 part of Exim already. Ability to modify the content of the directory
4199 is equivalent to the ability to modify a setuid binary!
4201 This needs to happen before we read the main configuration. */
4204 /*XXX this excrescence could move to the testsuite standard config setup file */
4206 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4209 /* Read the main runtime configuration data; this gives up if there
4210 is a failure. It leaves the configuration file open so that the subsequent
4211 configuration data for delivery can be read if needed.
4213 NOTE: immediately after opening the configuration file we change the working
4214 directory to "/"! Later we change to $spool_directory. We do it there, because
4215 during readconf_main() some expansion takes place already. */
4217 /* Store the initial cwd before we change directories. Can be NULL if the
4218 dir has already been unlinked. */
4219 initial_cwd = os_getcwd(NULL, 0);
4220 if (!initial_cwd && errno)
4221 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4223 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4224 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4227 -be[m] expansion test -
4228 -b[fF] filter test new
4230 -bmalware malware_test_file new
4232 -brw rewrite test new
4234 -bv[s] address verify -
4236 -bP <option> (except -bP config, which sets list_config)
4238 If any of these options is set, we suppress warnings about configuration
4239 issues (currently about tls_advertise_hosts and keep_environment not being
4243 int old_pool = store_pool;
4244 #ifdef MEASURE_TIMING
4246 (void)gettimeofday(&t0, NULL);
4249 store_pool = POOL_CONFIG;
4250 readconf_main(checking || list_options);
4251 store_pool = old_pool;
4253 #ifdef MEASURE_TIMING
4254 report_time_since(&t0, US"readconf_main (delta)");
4258 /* Now in directory "/" */
4260 if (cleanup_environment() == FALSE)
4261 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4264 /* If an action on specific messages is requested, or if a daemon or queue
4265 runner is being started, we need to know if Exim was called by an admin user.
4266 This is the case if the real user is root or exim, or if the real group is
4267 exim, or if one of the supplementary groups is exim or a group listed in
4268 admin_groups. We don't fail all message actions immediately if not admin_user,
4269 since some actions can be performed by non-admin users. Instead, set admin_user
4270 for later interrogation. */
4272 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4273 f.admin_user = TRUE;
4275 for (int i = 0; i < group_count && !f.admin_user; i++)
4276 if (group_list[i] == exim_gid)
4277 f.admin_user = TRUE;
4278 else if (admin_groups)
4279 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4280 if (admin_groups[j] == group_list[i])
4281 f.admin_user = TRUE;
4283 /* Another group of privileged users are the trusted users. These are root,
4284 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4285 are permitted to specify sender_addresses with -f on the command line, and
4286 other message parameters as well. */
4288 if (real_uid == root_uid || real_uid == exim_uid)
4289 f.trusted_caller = TRUE;
4293 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4294 if (trusted_users[i] == real_uid)
4295 f.trusted_caller = TRUE;
4298 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4299 if (trusted_groups[i] == real_gid)
4300 f.trusted_caller = TRUE;
4301 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4302 if (trusted_groups[i] == group_list[j])
4303 f.trusted_caller = TRUE;
4306 /* At this point, we know if the user is privileged and some command-line
4307 options become possibly impermissible, depending upon the configuration file. */
4309 if (checking && commandline_checks_require_admin && !f.admin_user)
4310 exim_fail("exim: those command-line flags are set to require admin\n");
4312 /* Handle the decoding of logging options. */
4314 decode_bits(log_selector, log_selector_size, log_notall,
4315 log_selector_string, log_options, log_options_count, US"log", 0);
4319 debug_printf("configuration file is %s\n", config_main_filename);
4320 debug_printf("log selectors =");
4321 for (int i = 0; i < log_selector_size; i++)
4322 debug_printf(" %08x", log_selector[i]);
4326 /* If domain literals are not allowed, check the sender address that was
4327 supplied with -f. Ditto for a stripped trailing dot. */
4331 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4332 exim_fail("exim: bad -f address \"%s\": domain literals not "
4333 "allowed\n", sender_address);
4334 if (f_end_dot && !strip_trailing_dot)
4335 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4336 "(trailing dot not allowed)\n", sender_address);
4339 /* See if an admin user overrode our logging. */
4341 if (cmdline_syslog_name)
4344 syslog_processname = cmdline_syslog_name;
4345 log_file_path = string_copy(CUS"syslog");
4348 /* not a panic, non-privileged users should not be able to spam paniclog */
4350 "exim: you lack sufficient privilege to specify syslog process name\n");
4352 /* Paranoia check of maximum lengths of certain strings. There is a check
4353 on the length of the log file path in log.c, which will come into effect
4354 if there are any calls to write the log earlier than this. However, if we
4355 get this far but the string is very long, it is better to stop now than to
4356 carry on and (e.g.) receive a message and then have to collapse. The call to
4357 log_write() from here will cause the ultimate panic collapse if the complete
4358 file name exceeds the buffer length. */
4360 if (Ustrlen(log_file_path) > 200)
4361 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4362 "log_file_path is longer than 200 chars: aborting");
4364 if (Ustrlen(pid_file_path) > 200)
4365 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4366 "pid_file_path is longer than 200 chars: aborting");
4368 if (Ustrlen(spool_directory) > 200)
4369 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4370 "spool_directory is longer than 200 chars: aborting");
4372 /* Length check on the process name given to syslog for its TAG field,
4373 which is only permitted to be 32 characters or less. See RFC 3164. */
4375 if (Ustrlen(syslog_processname) > 32)
4376 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4377 "syslog_processname is longer than 32 chars: aborting");
4382 log_write(0, LOG_MAIN, "%s", log_oneline);
4383 return EXIT_SUCCESS;
4386 return EXIT_FAILURE;
4388 /* In some operating systems, the environment variable TMPDIR controls where
4389 temporary files are created; Exim doesn't use these (apart from when delivering
4390 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4391 If TMPDIR is found in the environment, reset it to the value defined in the
4392 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4393 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4394 EXIM_TMPDIR by the build scripts.
4398 if (environ) for (uschar ** p = USS environ; *p; p++)
4399 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4401 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4402 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4404 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4408 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4409 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4410 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4411 called by a user who has set the TZ variable. This then affects the timestamps
4412 in log files and in Received: headers, and any created Date: header lines. The
4413 required timezone is settable in the configuration file, so nothing can be done
4414 about this earlier - but hopefully nothing will normally be logged earlier than
4415 this. We have to make a new environment if TZ is wrong, but don't bother if
4416 timestamps_utc is set, because then all times are in UTC anyway. */
4418 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4419 f.timestamps_utc = TRUE;
4422 uschar *envtz = US getenv("TZ");
4424 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4425 : timezone_string != NULL
4428 uschar **p = USS environ;
4432 if (environ) while (*p++) count++;
4433 if (!envtz) count++;
4434 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4435 if (environ) for (p = USS environ; *p; p++)
4436 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4437 if (timezone_string)
4439 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4440 sprintf(CS *newp++, "TZ=%s", timezone_string);
4445 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4446 tod_stamp(tod_log));
4450 /* Handle the case when we have removed the setuid privilege because of -C or
4451 -D. This means that the caller of Exim was not root.
4453 There is a problem if we were running as the Exim user. The sysadmin may
4454 expect this case to retain privilege because "the binary was called by the
4455 Exim user", but it hasn't, because either the -D option set macros, or the
4456 -C option set a non-trusted configuration file. There are two possibilities:
4458 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4459 to do message deliveries. Thus, the fact that it is running as a
4460 non-privileged user is plausible, and might be wanted in some special
4461 configurations. However, really_exim will have been set false when
4462 privilege was dropped, to stop Exim trying to write to its normal log
4463 files. Therefore, re-enable normal log processing, assuming the sysadmin
4464 has set up the log directory correctly.
4466 (2) If deliver_drop_privilege is not set, the configuration won't work as
4467 apparently intended, and so we log a panic message. In order to retain
4468 root for -C or -D, the caller must either be root or be invoking a
4469 trusted configuration file (when deliver_drop_privilege is false). */
4471 if ( removed_privilege
4472 && (!f.trusted_config || opt_D_used)
4473 && real_uid == exim_uid)
4474 if (deliver_drop_privilege)
4475 f.really_exim = TRUE; /* let logging work normally */
4477 log_write(0, LOG_MAIN|LOG_PANIC,
4478 "exim user lost privilege for using %s option",
4479 f.trusted_config? "-D" : "-C");
4481 /* Start up Perl interpreter if Perl support is configured and there is a
4482 perl_startup option, and the configuration or the command line specifies
4483 initializing starting. Note that the global variables are actually called
4484 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4487 if (perl_start_option != 0)
4488 opt_perl_at_start = (perl_start_option > 0);
4489 if (opt_perl_at_start && opt_perl_startup != NULL)
4492 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4493 if ((errstr = init_perl(opt_perl_startup)))
4494 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4495 opt_perl_started = TRUE;
4497 #endif /* EXIM_PERL */
4499 /* Log the arguments of the call if the configuration file said so. This is
4500 a debugging feature for finding out what arguments certain MUAs actually use.
4501 Don't attempt it if logging is disabled, or if listing variables or if
4502 verifying/testing addresses or expansions. */
4504 if ( (debug_selector & D_any || LOGGING(arguments))
4505 && f.really_exim && !list_options && !checking)
4507 uschar *p = big_buffer;
4508 Ustrcpy(p, US"cwd= (failed)");
4515 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4516 p += Ustrlen(CCS p);
4519 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4521 for (int i = 0; i < argc; i++)
4523 int len = Ustrlen(argv[i]);
4524 const uschar *printing;
4526 if (p + len + 8 >= big_buffer + big_buffer_size)
4528 Ustrcpy(p, US" ...");
4529 log_write(0, LOG_MAIN, "%s", big_buffer);
4530 Ustrcpy(big_buffer, US"...");
4533 printing = string_printing(argv[i]);
4534 if (!*printing) quote = US"\"";
4537 const uschar *pp = printing;
4539 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4541 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4542 (p - big_buffer) - 4), printing, quote);
4545 if (LOGGING(arguments))
4546 log_write(0, LOG_MAIN, "%s", big_buffer);
4548 debug_printf("%s\n", big_buffer);
4551 /* Set the working directory to be the top-level spool directory. We don't rely
4552 on this in the code, which always uses fully qualified names, but it's useful
4553 for core dumps etc. Don't complain if it fails - the spool directory might not
4554 be generally accessible and calls with the -C option (and others) have lost
4555 privilege by now. Before the chdir, we try to ensure that the directory exists.
4558 if (Uchdir(spool_directory) != 0)
4560 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4561 (void) Uchdir(spool_directory);
4564 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4565 alias file. Exim doesn't have such a concept, but this call is screwed into
4566 Sun's YP makefiles. Handle this by calling a configured script, as the real
4567 user who called Exim. The -oA option can be used to pass an argument to the
4572 (void) fclose(config_file);
4573 if (bi_command && *bi_command)
4576 const uschar * argv[3];
4577 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4578 if (alias_arg) argv[i++] = alias_arg;
4581 setgroups(group_count, group_list);
4582 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4584 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4585 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4587 execv(CS argv[0], (char *const *)argv);
4588 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4592 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4597 /* We moved the admin/trusted check to be immediately after reading the
4598 configuration file. We leave these prints here to ensure that syslog setup,
4599 logfile setup, and so on has already happened. */
4601 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4602 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4604 /* Only an admin user may start the daemon or force a queue run in the default
4605 configuration, but the queue run restriction can be relaxed. Only an admin
4606 user may request that a message be returned to its sender forthwith. Only an
4607 admin user may specify a debug level greater than D_v (because it might show
4608 passwords, etc. in lookup queries). Only an admin user may request a queue
4609 count. Only an admin user can use the test interface to scan for email
4610 (because Exim will be in the spool dir and able to look at mails). */
4614 BOOL debugset = (debug_selector & ~D_v) != 0;
4615 if ( deliver_give_up || f.daemon_listen || malware_test_file
4616 || count_queue && queue_list_requires_admin
4617 || list_queue && queue_list_requires_admin
4618 || qrunners && prod_requires_admin
4619 || queue_name_dest && prod_requires_admin
4620 || debugset && !f.running_in_test_harness
4622 exim_fail("exim:%s permission denied; not admin\n",
4623 debugset ? " debugging" : "");
4626 /* If the real user is not root or the exim uid, the argument for passing
4627 in an open TCP/IP connection for another message is not permitted, nor is
4628 running with the -N option for any delivery action, unless this call to exim is
4629 one that supplied an input message, or we are using a patched exim for
4630 regression testing. */
4632 if ( real_uid != root_uid && real_uid != exim_uid
4633 && ( continue_hostname
4635 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4637 && !f.running_in_test_harness
4639 exim_fail("exim: Permission denied; not exim user or root\n");
4641 /* If the caller is not trusted, certain arguments are ignored when running for
4642 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4643 Note that authority for performing certain actions on messages is tested in the
4644 queue_action() function. */
4646 if (!f.trusted_caller && !checking)
4648 sender_host_name = sender_host_address = interface_address =
4649 sender_ident = received_protocol = NULL;
4650 sender_host_port = interface_port = 0;
4651 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4654 /* If a sender host address is set, extract the optional port number off the
4655 end of it and check its syntax. Do the same thing for the interface address.
4656 Exim exits if the syntax is bad. */
4660 if (sender_host_address)
4661 sender_host_port = check_port(sender_host_address);
4662 if (interface_address)
4663 interface_port = check_port(interface_address);
4666 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4669 if (f.trusted_caller)
4671 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4672 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4675 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4678 /* If an SMTP message is being received check to see if the standard input is a
4679 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4680 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4685 union sockaddr_46 inetd_sock;
4686 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4687 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4689 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4690 if (family == AF_INET || family == AF_INET6)
4692 union sockaddr_46 interface_sock;
4693 size = sizeof(interface_sock);
4695 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4696 interface_address = host_ntoa(-1, &interface_sock, NULL,
4699 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4701 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4704 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4705 NULL, &sender_host_port);
4706 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4707 "inetd is not supported when mua_wrapper is set");
4711 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4716 /* If the load average is going to be needed while receiving a message, get it
4717 now for those OS that require the first call to os_getloadavg() to be done as
4718 root. There will be further calls later for each message received. */
4720 #ifdef LOAD_AVG_NEEDS_ROOT
4721 if ( receiving_message
4722 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4723 load_average = OS_GETLOADAVG();
4726 /* The queue_only configuration option can be overridden by -odx on the command
4727 line, except that if queue_only_override is false, queue_only cannot be unset
4728 from the command line. */
4730 if (queue_only_set && (queue_only_override || arg_queue_only))
4731 queue_only = arg_queue_only;
4733 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4736 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4737 if (arg_smtp_receive_timeout >= 0)
4738 smtp_receive_timeout = arg_smtp_receive_timeout;
4740 /* If Exim was started with root privilege, unless we have already removed the
4741 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4742 except when starting the daemon or doing some kind of delivery or address
4743 testing (-bt). These are the only cases when root need to be retained. We run
4744 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4745 retained only for starting the daemon. We always do the initgroups() in this
4746 situation (controlled by the TRUE below), in order to be as close as possible
4747 to the state Exim usually runs in. */
4749 if ( !unprivileged /* originally had root AND */
4750 && !removed_privilege /* still got root AND */
4751 && !f.daemon_listen /* not starting the daemon */
4752 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4753 && ( /* AND EITHER */
4754 deliver_drop_privilege /* requested unprivileged */
4756 !qrunners /* not running the queue */
4757 && ( msg_action_arg < 0 /* and */
4758 || msg_action != MSG_DELIVER /* not delivering */
4760 && (!checking || !f.address_test_mode) /* not address checking */
4761 && !rcpt_verify_quota /* and not quota checking */
4763 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4765 /* When we are retaining a privileged uid, we still change to the exim gid. */
4770 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4771 rv = setgid(exim_gid);
4772 /* Impact of failure is that some stuff might end up with an incorrect group.
4773 We track this for failures from root, since any attempt to change privilege
4774 by root should succeed and failures should be examined. For non-root,
4775 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4776 no need to complain then. */
4778 if (!(unprivileged || removed_privilege))
4779 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4782 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4783 (long int)exim_gid, strerror(errno));
4787 /* Handle a request to scan a file for malware */
4788 if (malware_test_file)
4790 #ifdef WITH_CONTENT_SCAN
4792 set_process_info("scanning file for malware");
4793 if ((result = malware_in_file(malware_test_file)) == FAIL)
4795 printf("No malware found.\n");
4796 exim_exit(EXIT_SUCCESS);
4800 printf("Malware lookup returned non-okay/fail: %d\n", result);
4801 exim_exit(EXIT_FAILURE);
4804 printf("Malware found: %s\n", malware_name);
4806 printf("Malware scan detected malware of unknown name.\n");
4808 printf("Malware scanning not enabled at compile time.\n");
4810 exim_exit(EXIT_FAILURE);
4813 /* Handle a request to list the delivery queue */
4817 set_process_info("listing the queue");
4818 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4819 exim_exit(EXIT_SUCCESS);
4822 /* Handle a request to count the delivery queue */
4826 set_process_info("counting the queue");
4827 fprintf(stdout, "%u\n", queue_count());
4828 exim_exit(EXIT_SUCCESS);
4831 /* Handle actions on specific messages, except for the force delivery and
4832 message load actions, which are done below. Some actions take a whole list of
4833 message ids, which are known to continue up to the end of the arguments. Others
4834 take a single message id and then operate on the recipients list. */
4836 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4838 int yield = EXIT_SUCCESS;
4839 set_process_info("acting on specified messages");
4841 /* ACL definitions may be needed when removing a message (-Mrm) because
4842 event_action gets expanded */
4844 if (msg_action == MSG_REMOVE)
4846 int old_pool = store_pool;
4847 store_pool = POOL_CONFIG;
4849 store_pool = old_pool;
4850 store_writeprotect(POOL_CONFIG);
4853 if (!one_msg_action)
4855 for (i = msg_action_arg; i < argc; i++)
4856 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4857 yield = EXIT_FAILURE;
4860 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4861 default: printf("\n"); break;
4865 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4866 recipients_arg)) yield = EXIT_FAILURE;
4870 /* We used to set up here to skip reading the ACL section, on
4871 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4872 Now, since the intro of the ${acl } expansion, ACL definitions may be
4873 needed in transports so we lost the optimisation. */
4876 int old_pool = store_pool;
4877 #ifdef MEASURE_TIMING
4879 (void)gettimeofday(&t0, NULL);
4882 store_pool = POOL_CONFIG;
4884 store_pool = old_pool;
4886 /* -be can add macro definitions, needing to link to the macro structure
4887 chain. Otherwise, make the memory used for config data readonly. */
4889 if (!expansion_test)
4890 store_writeprotect(POOL_CONFIG);
4892 #ifdef MEASURE_TIMING
4893 report_time_since(&t0, US"readconf_rest (delta)");
4897 /* Handle a request to check quota */
4898 if (rcpt_verify_quota)
4899 if (real_uid != root_uid && real_uid != exim_uid)
4900 exim_fail("exim: Permission denied\n");
4901 else if (recipients_arg >= argc)
4902 exim_fail("exim: missing recipient for quota check\n");
4905 verify_quota(US argv[recipients_arg]); /*XXX we lose track of const here */
4906 exim_exit(EXIT_SUCCESS);
4909 /* Handle the -brt option. This is for checking out retry configurations.
4910 The next three arguments are a domain name or a complete address, and
4911 optionally two error numbers. All it does is to call the function that
4912 scans the retry configuration data. */
4914 if (test_retry_arg >= 0)
4916 retry_config *yield;
4917 int basic_errno = 0;
4919 const uschar *s1, *s2;
4921 if (test_retry_arg >= argc)
4923 printf("-brt needs a domain or address argument\n");
4924 exim_exit(EXIT_FAILURE);
4926 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4929 /* If the first argument contains no @ and no . it might be a local user
4930 or it might be a single-component name. Treat as a domain. */
4932 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4934 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4935 "being \ntreated as a one-component domain, not as a local part.\n\n",
4939 /* There may be an optional second domain arg. */
4941 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4942 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4944 /* The final arg is an error name */
4946 if (test_retry_arg < argc)
4948 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4950 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4953 printf("%s\n", CS error);
4954 return EXIT_FAILURE;
4957 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4958 code > 100 as an error is for matching codes to the decade. Turn them into
4959 a real error code, off the decade. */
4961 if (basic_errno == ERRNO_MAIL4XX ||
4962 basic_errno == ERRNO_RCPT4XX ||
4963 basic_errno == ERRNO_DATA4XX)
4965 int code = (more_errno >> 8) & 255;
4967 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4968 else if (code > 100)
4969 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4973 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4974 printf("No retry information found\n");
4977 more_errno = yield->more_errno;
4978 printf("Retry rule: %s ", yield->pattern);
4980 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4982 printf("quota%s%s ",
4983 (more_errno > 0)? "_" : "",
4984 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4986 else if (yield->basic_errno == ECONNREFUSED)
4988 printf("refused%s%s ",
4989 (more_errno > 0)? "_" : "",
4990 (more_errno == 'M')? "MX" :
4991 (more_errno == 'A')? "A" : "");
4993 else if (yield->basic_errno == ETIMEDOUT)
4996 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4998 if (more_errno != 0) printf("_%s",
4999 (more_errno == 'M')? "MX" : "A");
5002 else if (yield->basic_errno == ERRNO_AUTHFAIL)
5003 printf("auth_failed ");
5006 for (retry_rule * r = yield->rules; r; r = r->next)
5008 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
5009 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
5015 printf(",%d.", x/1000);
5029 exim_exit(EXIT_SUCCESS);
5032 /* Handle a request to list one or more configuration options */
5033 /* If -n was set, we suppress some information */
5038 set_process_info("listing variables");
5039 if (recipients_arg >= argc)
5040 fail = !readconf_print(US"all", NULL, flag_n);
5041 else for (i = recipients_arg; i < argc; i++)
5044 (Ustrcmp(argv[i], "router") == 0 ||
5045 Ustrcmp(argv[i], "transport") == 0 ||
5046 Ustrcmp(argv[i], "authenticator") == 0 ||
5047 Ustrcmp(argv[i], "macro") == 0 ||
5048 Ustrcmp(argv[i], "environment") == 0))
5050 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
5054 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
5056 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
5061 set_process_info("listing config");
5062 exim_exit(readconf_print(US"config", NULL, flag_n)
5063 ? EXIT_SUCCESS : EXIT_FAILURE);
5067 /* Initialise subsystems as required. */
5071 /* Handle a request to deliver one or more messages that are already on the
5072 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
5073 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
5075 Delivery of specific messages is typically used for a small number when
5076 prodding by hand (when the option forced_delivery will be set) or when
5077 re-execing to regain root privilege. Each message delivery must happen in a
5078 separate process, so we fork a process for each one, and run them sequentially
5079 so that debugging output doesn't get intertwined, and to avoid spawning too
5080 many processes if a long list is given. However, don't fork for the last one;
5081 this saves a process in the common case when Exim is called to deliver just one
5084 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
5086 if (prod_requires_admin && !f.admin_user)
5088 fprintf(stderr, "exim: Permission denied\n");
5089 exim_exit(EXIT_FAILURE);
5091 set_process_info("delivering specified messages");
5092 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
5093 for (i = msg_action_arg; i < argc; i++)
5097 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
5098 that runs into a later copy into the untainted global message_id[] */
5099 /*XXX Do we need a length limit check here? */
5101 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5102 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
5104 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5105 exim_underbar_exit(EXIT_SUCCESS);
5109 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
5111 exim_exit(EXIT_FAILURE);
5115 exim_exit(EXIT_SUCCESS);
5119 /* If only a single queue run is requested, without SMTP listening, we can just
5120 turn into a queue runner, with an optional starting message id. */
5122 if (is_onetime_qrun() && !f.daemon_listen)
5124 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
5125 exim_exit(EXIT_SUCCESS);
5129 /* Find the login name of the real user running this process. This is always
5130 needed when receiving a message, because it is written into the spool file. It
5131 may also be used to construct a from: or a sender: header, and in this case we
5132 need the user's full name as well, so save a copy of it, checked for RFC822
5133 syntax and munged if necessary, if it hasn't previously been set by the -F
5134 argument. We may try to get the passwd entry more than once, in case NIS or
5135 other delays are in evidence. Save the home directory for use in filter testing
5140 if ((pw = getpwuid(real_uid)) != NULL)
5142 originator_login = string_copy(US pw->pw_name);
5143 originator_home = string_copy(US pw->pw_dir);
5145 /* If user name has not been set by -F, set it from the passwd entry
5146 unless -f has been used to set the sender address by a trusted user. */
5148 if (!originator_name)
5150 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5152 uschar *name = US pw->pw_gecos;
5153 uschar *amp = Ustrchr(name, '&');
5156 /* Most Unix specify that a '&' character in the gecos field is
5157 replaced by a copy of the login name, and some even specify that
5158 the first character should be upper cased, so that's what we do. */
5163 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5164 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5165 buffer[loffset] = toupper(buffer[loffset]);
5169 /* If a pattern for matching the gecos field was supplied, apply
5170 it and then expand the name string. */
5172 GET_OPTION("gecos_pattern");
5173 GET_OPTION("gecos_name");
5174 if (gecos_pattern && gecos_name)
5176 const pcre2_code *re;
5177 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5179 if (regex_match_and_setup(re, name, 0, -1))
5181 uschar *new_name = expand_string(gecos_name);
5185 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5186 "gecos field \"%s\"\n", new_name, name);
5189 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5190 "\"%s\": %s\n", gecos_name, expand_string_message);
5192 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5193 "gecos field \"%s\"\n", gecos_pattern, name);
5194 store_free((void *)re);
5196 originator_name = string_copy(name);
5199 /* A trusted caller has used -f but not -F */
5201 else originator_name = US"";
5204 /* Break the retry loop */
5209 if (++i > finduser_retries) break;
5213 /* If we cannot get a user login, log the incident and give up, unless the
5214 configuration specifies something to use. When running in the test harness,
5215 any setting of unknown_login overrides the actual name. */
5217 if (!originator_login || f.running_in_test_harness)
5219 GET_OPTION("unknown_login");
5222 originator_login = expand_string(unknown_login);
5223 if (!originator_name && unknown_username)
5224 originator_name = expand_string(unknown_username);
5225 if (!originator_name) originator_name = US"";
5227 if (!originator_login)
5228 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5232 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5235 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5237 /* If a message is created by this call of Exim, the uid/gid of its originator
5238 are those of the caller. These values are overridden if an existing message is
5239 read in from the spool. */
5241 originator_uid = real_uid;
5242 originator_gid = real_gid;
5244 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5245 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5247 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5248 returns. We leave this till here so that the originator_ fields are available
5249 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5252 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5256 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5257 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5258 "mua_wrapper is set");
5261 # ifndef DISABLE_TLS
5262 /* This also checks that the library linkage is working and we can call
5263 routines in it, so call even if tls_require_ciphers is unset */
5265 # ifdef MEASURE_TIMING
5267 (void)gettimeofday(&t0, NULL);
5269 if (!tls_dropprivs_validate_require_cipher(FALSE))
5270 exim_exit(EXIT_FAILURE);
5271 # ifdef MEASURE_TIMING
5272 report_time_since(&t0, US"validate_ciphers (delta)");
5280 /* If the sender ident has not been set (by a trusted caller) set it to
5281 the caller. This will get overwritten below for an inetd call. If a trusted
5282 caller has set it empty, unset it. */
5284 if (!sender_ident) sender_ident = originator_login;
5285 else if (!*sender_ident) sender_ident = NULL;
5287 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5288 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5289 originator_* variables set. */
5291 if (test_rewrite_arg >= 0)
5293 f.really_exim = FALSE;
5294 if (test_rewrite_arg >= argc)
5296 printf("-brw needs an address argument\n");
5297 exim_exit(EXIT_FAILURE);
5299 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5300 exim_exit(EXIT_SUCCESS);
5303 /* A locally-supplied message is considered to be coming from a local user
5304 unless a trusted caller supplies a sender address with -f, or is passing in the
5305 message via SMTP (inetd invocation or otherwise). */
5307 if ( !sender_address && !smtp_input
5308 || !f.trusted_caller && filter_test == FTEST_NONE)
5310 f.sender_local = TRUE;
5312 /* A trusted caller can supply authenticated_sender and authenticated_id
5313 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5314 defaults except when host checking. */
5316 if (!authenticated_sender && !host_checking)
5317 authenticated_sender = string_sprintf("%s@%s", originator_login,
5318 qualify_domain_sender);
5319 if (!authenticated_id && !host_checking)
5320 authenticated_id = originator_login;
5323 /* Trusted callers are always permitted to specify the sender address.
5324 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5325 is specified is the empty address. However, if a trusted caller does not
5326 specify a sender address for SMTP input, we leave sender_address unset. This
5327 causes the MAIL commands to be honoured. */
5329 if ( !smtp_input && !sender_address
5330 || !receive_check_set_sender(sender_address))
5332 /* Either the caller is not permitted to set a general sender, or this is
5333 non-SMTP input and the trusted caller has not set a sender. If there is no
5334 sender, or if a sender other than <> is set, override with the originator's
5335 login (which will get qualified below), except when checking things. */
5337 if ( !sender_address /* No sender_address set */
5339 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5340 !checking)) /* Not running tests, including filter tests */
5342 sender_address = originator_login;
5343 f.sender_address_forced = FALSE;
5344 sender_address_domain = 0;
5348 /* Remember whether an untrusted caller set the sender address */
5350 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5352 /* Ensure that the sender address is fully qualified unless it is the empty
5353 address, which indicates an error message, or doesn't exist (root caller, smtp
5354 interface, no -f argument). */
5356 if (sender_address && *sender_address && sender_address_domain == 0)
5357 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5358 qualify_domain_sender);
5360 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5362 /* Handle a request to verify a list of addresses, or test them for delivery.
5363 This must follow the setting of the sender address, since routers can be
5364 predicated upon the sender. If no arguments are given, read addresses from
5365 stdin. Set debug_level to at least D_v to get full output for address testing.
5368 if (verify_address_mode || f.address_test_mode)
5371 int flags = vopt_qualify;
5373 if (verify_address_mode)
5375 if (!verify_as_sender) flags |= vopt_is_recipient;
5376 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5381 flags |= vopt_is_recipient;
5382 debug_selector |= D_v;
5383 debug_file = stderr;
5384 debug_fd = fileno(debug_file);
5385 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5388 if (recipients_arg < argc)
5389 while (recipients_arg < argc)
5391 /* Supplied addresses are tainted since they come from a user */
5392 uschar * s = string_copy_taint(
5393 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5397 BOOL finished = FALSE;
5398 uschar *ss = parse_find_address_end(s, FALSE);
5399 if (*ss == ',') *ss = 0; else finished = TRUE;
5400 test_address(s, flags, &exit_value);
5403 while (*++s == ',' || isspace(*s)) ;
5409 uschar * s = get_stdinput(NULL, NULL);
5411 test_address(string_copy_taint(
5412 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5414 flags, &exit_value);
5418 exim_exit(exit_value);
5421 /* Handle expansion checking. Either expand items on the command line, or read
5422 from stdin if there aren't any. If -Mset was specified, load the message so
5423 that its variables can be used, but restrict this facility to admin users.
5424 Otherwise, if -bem was used, read a message from stdin. */
5428 dns_init(FALSE, FALSE, FALSE);
5429 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5433 exim_fail("exim: permission denied\n");
5434 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5435 /* Checking the length of the ID is sufficient to validate it.
5436 Get an untainted version so file opens can be done. */
5437 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5439 spoolname = string_sprintf("%s-H", message_id);
5440 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5441 printf ("Failed to load message datafile %s\n", message_id);
5442 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5443 printf ("Failed to load message %s\n", message_id);
5446 /* Read a test message from a file. We fudge it up to be on stdin, saving
5447 stdin itself for later reading of expansion strings. */
5449 else if (expansion_test_message)
5451 uschar * rme = expand_string(recipients_max);
5452 int save_stdin = dup(0);
5453 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5455 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5458 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5459 message_ended = END_NOTENDED;
5460 recipients_max_expanded = atoi(CCS rme);
5461 read_message_body(receive_msg(extract_recipients));
5462 message_linecount += body_linecount;
5463 (void)dup2(save_stdin, 0);
5464 (void)close(save_stdin);
5465 clearerr(stdin); /* Required by Darwin */
5468 /* Only admin users may see config-file macros this way */
5470 if (!f.admin_user) macros_user = macros = mlast = NULL;
5472 /* Allow $recipients for this testing */
5474 f.enable_dollar_recipients = TRUE;
5476 /* Expand command line items */
5478 if (recipients_arg < argc)
5479 while (recipients_arg < argc)
5480 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5486 char *(*fn_readline)(const char *) = NULL;
5487 void (*fn_addhist)(const char *) = NULL;
5491 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5494 while (s = get_stdinput(fn_readline, fn_addhist))
5495 expansion_test_line(s);
5498 if (dlhandle) dlclose(dlhandle);
5502 /* The data file will be open after -Mset */
5504 if (deliver_datafile >= 0)
5506 (void)close(deliver_datafile);
5507 deliver_datafile = -1;
5510 exim_exit(EXIT_SUCCESS);
5514 /* The active host name is normally the primary host name, but it can be varied
5515 for hosts that want to play several parts at once. We need to ensure that it is
5516 set for host checking, and for receiving messages. */
5518 smtp_active_hostname = primary_hostname;
5519 GET_OPTION("smtp_active_hostname");
5520 if (raw_active_hostname)
5522 uschar * nah = expand_string(raw_active_hostname);
5525 if (!f.expand_string_forcedfail)
5526 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5527 "(smtp_active_hostname): %s", raw_active_hostname,
5528 expand_string_message);
5530 else if (nah[0]) smtp_active_hostname = nah;
5533 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5534 given IP address so that the blocking and relay configuration can be tested.
5535 Unless a sender_ident was set by -oMt, we discard it (the default is the
5536 caller's login name). An RFC 1413 call is made only if we are running in the
5537 test harness and an incoming interface and both ports are specified, because
5538 there is no TCP/IP call to find the ident for. */
5545 if (!sender_ident_set)
5547 sender_ident = NULL;
5548 if (f.running_in_test_harness && sender_host_port
5549 && interface_address && interface_port)
5550 verify_get_ident(1223); /* note hardwired port number */
5553 /* In case the given address is a non-canonical IPv6 address, canonicalize
5554 it. Use the compressed form for IPv6. */
5556 size = host_aton(sender_host_address, x);
5557 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5559 (void) host_nmtoa(size, x, -1, sender_host_address, ':');
5561 (void) ipv6_nmtoa(x, sender_host_address);
5563 /* Now set up for testing */
5565 host_build_sender_fullhost();
5569 f.sender_local = FALSE;
5570 f.sender_host_notsocket = TRUE;
5571 debug_file = stderr;
5572 debug_fd = fileno(debug_file);
5573 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5574 "**** but without any ident (RFC 1413) callback.\n"
5575 "**** This is not for real!\n\n",
5576 sender_host_address);
5578 set_connection_id();
5579 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5580 if (verify_check_host(&hosts_connection_nolog) == OK)
5582 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5583 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5585 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5587 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5588 because a log line has already been written for all its failure exists
5589 (usually "connection refused: <reason>") and writing another one is
5590 unnecessary clutter. */
5592 if (smtp_start_session())
5595 for (; (reset_point = store_mark()); store_reset(reset_point))
5597 if (smtp_setup_msg() <= 0) break;
5598 if (!receive_msg(FALSE)) break;
5600 return_path = sender_address = NULL;
5601 dnslist_domain = dnslist_matched = NULL;
5602 #ifndef DISABLE_DKIM
5603 dkim_cur_signer = NULL;
5606 deliver_localpart_orig = NULL;
5607 deliver_domain_orig = NULL;
5608 callout_address = sending_ip_address = NULL;
5609 deliver_localpart_data = deliver_domain_data =
5610 recipient_data = sender_data = NULL;
5611 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5615 exim_exit(EXIT_SUCCESS);
5619 /* Arrange for message reception if recipients or SMTP were specified;
5620 otherwise complain unless a version print (-bV) happened or this is a filter
5621 verification test or info dump.
5622 In the former case, show the configuration file name. */
5624 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5626 if (version_printed)
5628 if (Ustrchr(config_main_filelist, ':'))
5629 printf("Configuration file search path is %s\n", config_main_filelist);
5630 printf("Configuration file is %s\n", config_main_filename);
5631 return EXIT_SUCCESS;
5634 if (info_flag != CMDINFO_NONE)
5636 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5637 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5640 if (filter_test == FTEST_NONE)
5641 exim_usage(called_as);
5645 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5646 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5647 that we are not called from inetd, because that is rejected above. The
5648 following configuration settings are forced here:
5650 (1) Synchronous delivery (-odi)
5651 (2) Errors to stderr (-oep == -oeq)
5652 (3) No parallel remote delivery
5653 (4) Unprivileged delivery
5655 We don't force overall queueing options because there are several of them;
5656 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5657 to override any SMTP queueing. */
5661 f.synchronous_delivery = TRUE;
5662 arg_error_handling = ERRORS_STDERR;
5663 remote_max_parallel = 1;
5664 deliver_drop_privilege = TRUE;
5665 f.queue_smtp = FALSE;
5666 queue_smtp_domains = NULL;
5668 message_utf8_downconvert = -1; /* convert-if-needed */
5673 /* Prepare to accept one or more new messages on the standard input. When a
5674 message has been read, its id is returned in message_id[]. If doing immediate
5675 delivery, we fork a delivery process for each received message, except for the
5676 last one, where we can save a process switch.
5678 It is only in non-smtp mode that error_handling is allowed to be changed from
5679 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5680 sendmail error modes other than -oem ever actually used? Later: yes.) */
5682 if (!smtp_input) error_handling = arg_error_handling;
5684 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5685 logging being sent down the socket and make an identd call to get the
5688 else if (f.is_inetd)
5690 (void)fclose(stderr);
5691 exim_nullstd(); /* Re-open to /dev/null */
5692 verify_get_ident(IDENT_PORT);
5693 host_build_sender_fullhost();
5694 set_process_info("handling incoming connection from %s via inetd",
5698 /* If the sender host address has been set, build sender_fullhost if it hasn't
5699 already been done (which it will have been for inetd). This caters for the
5700 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5701 so that the test for IP options is skipped for -bs input. */
5703 if (sender_host_address && !sender_fullhost)
5705 host_build_sender_fullhost();
5706 set_process_info("handling incoming connection from %s via -oMa",
5708 f.sender_host_notsocket = TRUE;
5711 /* Otherwise, set the sender host as unknown except for inetd calls. This
5712 prevents host checking in the case of -bs not from inetd and also for -bS. */
5714 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5716 /* If stdout does not exist, then dup stdin to stdout. This can happen
5717 if exim is started from inetd. In this case fd 0 will be set to the socket,
5718 but fd 1 will not be set. This also happens for passed SMTP channels. */
5720 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5722 /* Set up the incoming protocol name and the state of the program. Root is
5723 allowed to force received protocol via the -oMr option above. If we have come
5724 via inetd, the process info has already been set up. We don't set
5725 received_protocol here for smtp input, as it varies according to
5726 batch/HELO/EHLO/AUTH/TLS. */
5730 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5731 smtp_batched_input? "batched " : "",
5732 sender_address ? sender_address : originator_login);
5736 int old_pool = store_pool;
5737 store_pool = POOL_PERM;
5738 if (!received_protocol)
5739 received_protocol = string_sprintf("local%s", called_as);
5740 store_pool = old_pool;
5741 set_process_info("accepting a local non-SMTP message from <%s>",
5745 /* Initialize the session_local_queue-only flag (this will be ignored if
5746 mua_wrapper is set) */
5749 session_local_queue_only = queue_only;
5751 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5752 the spool if so configured. On failure, we must not attempt to send an error
5753 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5754 error code is given.) */
5756 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5757 exim_fail("exim: insufficient disk space\n");
5759 /* If this is smtp input of any kind, real or batched, handle the start of the
5762 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5763 because a log line has already been written for all its failure exists
5764 (usually "connection refused: <reason>") and writing another one is
5765 unnecessary clutter. */
5767 set_connection_id();
5772 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5773 if (verify_check_host(&hosts_connection_nolog) == OK)
5775 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5776 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5778 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5779 if (!smtp_start_session())
5782 exim_exit(EXIT_SUCCESS);
5786 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5787 (we handle buferring so as to have visibility of fill level). */
5791 GET_OPTION("message_size_limit");
5792 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5793 if (expand_string_message)
5794 if (thismessage_size_limit == -1)
5795 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5796 "message_size_limit: %s", expand_string_message);
5798 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5799 "message_size_limit: %s", expand_string_message);
5801 setvbuf(stdin, NULL, _IONBF, 0);
5804 /* Loop for several messages when reading SMTP input. If we fork any child
5805 processes, we don't want to wait for them unless synchronous delivery is
5806 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5807 same as SIG_DFL, despite the fact that documentation often lists the default as
5808 "ignore". This is a confusing area. This is what I know:
5810 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5811 processes that complete simply to go away without ever becoming defunct. You
5812 can't then wait for them - but we don't want to wait for them in the
5813 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5814 happen for all OS (e.g. *BSD is different).
5816 But that's not the end of the story. Some (many? all?) systems have the
5817 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5818 has by default, so it seems that the difference is merely one of default
5819 (compare restarting vs non-restarting signals).
5821 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5822 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5823 of the loop below. Paranoia rules.
5825 February 2003: That's *still* not the end of the story. There are now versions
5826 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5827 process then calls waitpid(), a grumble is written to the system log, because
5828 this is logically inconsistent. In other words, it doesn't like the paranoia.
5829 As a consequence of this, the waitpid() below is now excluded if we are sure
5830 that SIG_IGN works. */
5832 if (!f.synchronous_delivery)
5835 struct sigaction act;
5836 act.sa_handler = SIG_IGN;
5837 sigemptyset(&(act.sa_mask));
5838 act.sa_flags = SA_NOCLDWAIT;
5839 sigaction(SIGCHLD, &act, NULL);
5841 signal(SIGCHLD, SIG_IGN);
5845 /* Save the current store pool point, for resetting at the start of
5846 each message, and save the real sender address, if any. */
5848 real_sender_address = sender_address;
5850 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5851 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5854 for (BOOL more = TRUE; more; )
5856 rmark reset_point = store_mark();
5859 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5860 input and build the recipients list, before calling receive_msg() to read the
5861 message proper. Whatever sender address is given in the SMTP transaction is
5862 often ignored for local senders - we use the actual sender, which is normally
5863 either the underlying user running this process or a -f argument provided by
5864 a trusted caller. It is saved in real_sender_address. The test for whether to
5865 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5870 if ((rc = smtp_setup_msg()) > 0)
5872 if ( real_sender_address
5873 && !receive_check_set_sender(sender_address))
5875 sender_address = raw_sender = real_sender_address;
5876 sender_address_unrewritten = NULL;
5879 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5880 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5881 the very end. The result of the ACL is ignored (as for other non-SMTP
5882 messages). It is run for its potential side effects. */
5884 if (smtp_batched_input)
5886 GET_OPTION("acl_not_smtp_start");
5887 if (acl_not_smtp_start)
5889 uschar * user_msg, * log_msg;
5890 f.enable_dollar_recipients = TRUE;
5891 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5892 &user_msg, &log_msg);
5893 f.enable_dollar_recipients = FALSE;
5897 /* Now get the data for the message */
5899 more = receive_msg(extract_recipients);
5902 cancel_cutthrough_connection(TRUE, US"receive dropped");
5903 if (more) goto MORELOOP;
5904 smtp_log_no_mail(); /* Log no mail if configured */
5905 exim_exit(EXIT_FAILURE);
5910 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5911 smtp_log_no_mail(); /* Log no mail if configured */
5912 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5916 /* In the non-SMTP case, we have all the information from the command
5917 line, but must process it in case it is in the more general RFC822
5918 format, and in any case, to detect syntax errors. Also, it appears that
5919 the use of comma-separated lists as single arguments is common, so we
5920 had better support them. */
5924 uschar * rme = expand_string(recipients_max);
5925 int rcount = 0, count = argc - recipients_arg;
5926 const uschar ** list = argv + recipients_arg;
5928 recipients_max_expanded = atoi(CCS rme);
5930 /* These options cannot be changed dynamically for non-SMTP messages */
5932 f.active_local_sender_retain = local_sender_retain;
5933 f.active_local_from_check = local_from_check;
5935 /* Save before any rewriting */
5937 raw_sender = string_copy(sender_address);
5939 /* Loop for each argument (supplied by user hence tainted) */
5941 for (int i = 0; i < count; i++)
5943 int start, end, domain;
5945 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5946 We'll still want to cap it to something, just in case. */
5947 uschar * s = string_copy_taint(
5948 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5951 /* Loop for each comma-separated address */
5955 BOOL finished = FALSE;
5957 uschar * ss = parse_find_address_end(s, FALSE);
5959 if (*ss == ',') *ss = 0; else finished = TRUE;
5961 /* Check max recipients - if -t was used, these aren't recipients */
5963 if ( recipients_max_expanded > 0 && ++rcount > recipients_max_expanded
5964 && !extract_recipients)
5966 DEBUG(D_all) debug_printf("excess reipients (max %d)\n",
5967 recipients_max_expanded);
5969 if (error_handling == ERRORS_STDERR)
5971 fprintf(stderr, "exim: too many recipients\n");
5972 exim_exit(EXIT_FAILURE);
5976 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5977 errors_sender_rc : EXIT_FAILURE;
5982 BOOL b = allow_utf8_domains;
5983 allow_utf8_domains = TRUE;
5986 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5990 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5991 else allow_utf8_domains = b;
5996 if (domain == 0 && !f.allow_unqualified_recipient)
5999 errmess = US"unqualified recipient address not allowed";
6004 DEBUG(D_all) debug_printf("bad recipient address \"%s\": %s\n",
6005 string_printing(list[i]), errmess);
6007 if (error_handling == ERRORS_STDERR)
6009 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
6010 string_printing(list[i]), errmess);
6011 exim_exit(EXIT_FAILURE);
6017 eblock.text1 = string_printing(list[i]);
6018 eblock.text2 = errmess;
6020 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
6021 errors_sender_rc : EXIT_FAILURE;
6025 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
6028 while (*++s && (*s == ',' || isspace(*s)));
6032 /* Show the recipients when debugging */
6036 if (sender_address) debug_printf("Sender: %s\n", sender_address);
6037 if (recipients_list)
6039 debug_printf("Recipients:\n");
6040 for (int i = 0; i < recipients_count; i++)
6041 debug_printf(" %s\n", recipients_list[i].address);
6045 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
6046 ignored; rejecting here would just add complication, and it can just as
6047 well be done later. Allow $recipients to be visible in the ACL. */
6049 GET_OPTION("acl_not_smtp_start");
6050 if (acl_not_smtp_start)
6052 uschar * user_msg, * log_msg;
6053 f.enable_dollar_recipients = TRUE;
6054 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
6055 &user_msg, &log_msg);
6056 f.enable_dollar_recipients = FALSE;
6059 /* Pause for a while waiting for input. If none received in that time,
6060 close the logfile, if we had one open; then if we wait for a long-running
6061 datasource (months, in one use-case) log rotation will not leave us holding
6064 if (!receive_timeout)
6065 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
6068 /* Read the data for the message. If filter_test is not FTEST_NONE, this
6069 will just read the headers for the message, and not write anything onto the
6072 message_ended = END_NOTENDED;
6073 more = receive_msg(extract_recipients);
6075 /* more is always FALSE here (not SMTP message) when reading a message
6076 for real; when reading the headers of a message for filter testing,
6077 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
6079 if (!message_id[0]) exim_exit(EXIT_FAILURE);
6080 } /* Non-SMTP message reception */
6082 /* If this is a filter testing run, there are headers in store, but
6083 no message on the spool. Run the filtering code in testing mode, setting
6084 the domain to the qualify domain and the local part to the current user,
6085 unless they have been set by options. The prefix and suffix are left unset
6086 unless specified. The the return path is set to to the sender unless it has
6087 already been set from a return-path header in the message. */
6089 if (filter_test != FTEST_NONE)
6091 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
6092 deliver_domain_orig = deliver_domain;
6093 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
6094 deliver_localpart_orig = deliver_localpart;
6095 deliver_localpart_prefix = US ftest_prefix;
6096 deliver_localpart_suffix = US ftest_suffix;
6097 deliver_home = originator_home;
6101 printf("Return-path copied from sender\n");
6102 return_path = string_copy(sender_address);
6105 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
6106 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
6108 receive_add_recipient(
6109 string_sprintf("%s%s%s@%s",
6110 ftest_prefix ? ftest_prefix : US"",
6112 ftest_suffix ? ftest_suffix : US"",
6113 deliver_domain), -1);
6115 printf("Recipient = %s\n", recipients_list[0].address);
6116 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
6117 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
6119 if (chdir("/")) /* Get away from wherever the user is running this from */
6121 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
6122 exim_exit(EXIT_FAILURE);
6125 /* Now we run either a system filter test, or a user filter test, or both.
6126 In the latter case, headers added by the system filter will persist and be
6127 available to the user filter. We need to copy the filter variables
6130 if (filter_test & FTEST_SYSTEM)
6131 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
6132 exim_exit(EXIT_FAILURE);
6134 memcpy(filter_sn, filter_n, sizeof(filter_sn));
6136 if (filter_test & FTEST_USER)
6137 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
6138 exim_exit(EXIT_FAILURE);
6140 exim_exit(EXIT_SUCCESS);
6143 /* Else act on the result of message reception. We should not get here unless
6144 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
6145 will be TRUE. If it is not, check on the number of messages received in this
6148 if ( !session_local_queue_only
6149 && smtp_accept_queue_per_connection > 0
6150 && receive_messagecount > smtp_accept_queue_per_connection)
6152 session_local_queue_only = TRUE;
6153 queue_only_reason = 2;
6156 /* Initialize local_queue_only from session_local_queue_only. If it is false,
6157 and queue_only_load is set, check that the load average is below it. If it is
6158 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
6159 default), we put the whole session into queue_only mode. It then remains this
6160 way for any subsequent messages on the same SMTP connection. This is a
6161 deliberate choice; even though the load average may fall, it doesn't seem
6162 right to deliver later messages on the same call when not delivering earlier
6163 ones. However, there are odd cases where this is not wanted, so this can be
6164 changed by setting queue_only_load_latch false. */
6166 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
6167 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
6169 queue_only_reason = 3;
6170 if (queue_only_load_latch) session_local_queue_only = TRUE;
6173 /* If running as an MUA wrapper, all queueing options and freezing options
6177 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6179 /* Log the queueing here, when it will get a message id attached, but
6180 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6183 if (local_queue_only)
6185 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6186 switch(queue_only_reason)
6189 log_write(L_delay_delivery,
6190 LOG_MAIN, "no immediate delivery: more than %d messages "
6191 "received in one connection", smtp_accept_queue_per_connection);
6195 log_write(L_delay_delivery,
6196 LOG_MAIN, "no immediate delivery: load average %.2f",
6197 (double)load_average/1000.0);
6202 else if (f.queue_only_policy || f.deliver_freeze)
6203 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6205 /* Else do the delivery unless the ACL or local_scan() called for queue only
6206 or froze the message. Always deliver in a separate process. A fork failure is
6207 not a disaster, as the delivery will eventually happen on a subsequent queue
6208 run. The search cache must be tidied before the fork, as the parent will
6209 do it before exiting. The child will trigger a lookup failure and
6210 thereby defer the delivery if it tries to use (for example) a cached ldap
6211 connection that the parent has called unbind on. */
6218 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6221 close_unwanted(); /* Close unwanted file descriptors and TLS */
6222 exim_nullstd(); /* Ensure std{in,out,err} exist */
6224 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6225 mode, deliver_drop_privilege is forced TRUE). */
6227 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6229 delivery_re_exec(CEE_EXEC_EXIT);
6230 /* Control does not return here. */
6233 /* No need to re-exec */
6235 rc = deliver_message(message_id, FALSE, FALSE);
6237 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6238 ? EXIT_SUCCESS : EXIT_FAILURE);
6243 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6244 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6245 "process: %s", strerror(errno));
6249 release_cutthrough_connection(US"msg passed for delivery");
6251 /* In the parent, wait if synchronous delivery is required. This will
6252 always be the case in MUA wrapper mode. */
6254 if (f.synchronous_delivery)
6257 while (wait(&status) != pid);
6258 if ((status & 0x00ff) != 0)
6259 log_write(0, LOG_MAIN|LOG_PANIC,
6260 "process %d crashed with signal %d while delivering %s",
6261 (int)pid, status & 0x00ff, message_id);
6262 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6267 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6268 automatically reaps children (see comments above the loop), clear away any
6269 finished subprocesses here, in case there are lots of messages coming in
6270 from the same source. */
6272 #ifndef SIG_IGN_WORKS
6273 while (waitpid(-1, NULL, WNOHANG) > 0);
6277 return_path = sender_address = NULL;
6278 authenticated_sender = NULL;
6279 deliver_localpart_orig = NULL;
6280 deliver_domain_orig = NULL;
6281 deliver_host = deliver_host_address = NULL;
6282 dnslist_domain = dnslist_matched = NULL;
6283 #ifdef WITH_CONTENT_SCAN
6284 malware_name = NULL;
6287 callout_address = NULL;
6288 sending_ip_address = NULL;
6289 deliver_localpart_data = deliver_domain_data =
6290 recipient_data = sender_data = NULL;
6292 lookup_value = NULL; /* Can be set by ACL */
6294 store_reset(reset_point);
6297 exim_exit(EXIT_SUCCESS); /* Never returns */
6298 return 0; /* To stop compiler warning */