1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2022 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
10 /* The main function: entry point, initialization, and high-level control.
11 Also a few functions that don't naturally fit elsewhere. */
16 #if defined(__GLIBC__) && !defined(__UCLIBC__)
17 # include <gnu/libc-version.h>
24 # include <execinfo.h>
28 # include <gnutls/gnutls.h>
29 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
34 extern void init_lookup_list(void);
38 /*************************************************
39 * Function interface to store functions *
40 *************************************************/
42 /* We need some real functions to pass to the PCRE regular expression library
43 for store allocation via Exim's store manager. The normal calls are actually
44 macros that pass over location information to make tracing easier. These
45 functions just interface to the standard macro calls. A good compiler will
46 optimize out the tail recursion and so not make them too expensive. */
49 function_store_malloc(PCRE2_SIZE size, void * tag)
51 return store_malloc((int)size);
55 function_store_free(void * block, void * tag)
57 /* At least some version of pcre2 pass a null pointer */
58 if (block) store_free(block);
63 function_store_get(PCRE2_SIZE size, void * tag)
65 return store_get((int)size, GET_UNTAINTED); /* loses track of taint */
69 function_store_nullfree(void * block, void * tag)
76 /*************************************************
77 * Enums for cmdline interface *
78 *************************************************/
80 enum commandline_info { CMDINFO_NONE=0,
81 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
89 pcre_mlc_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
90 pcre_gen_ctx = pcre2_general_context_create(function_store_get, function_store_nullfree, NULL);
92 pcre_mlc_cmp_ctx = pcre2_compile_context_create(pcre_mlc_ctx);
93 pcre_gen_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
95 pcre_gen_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
101 /*************************************************
102 * Execute regular expression and set strings *
103 *************************************************/
105 /* This function runs a regular expression match, and sets up the pointers to
106 the matched substrings. The matched strings are copied so the lifetime of
107 the subject is not a problem.
110 re the compiled expression
111 subject the subject string
112 options additional PCRE options
113 setup if < 0 do full setup
114 if >= 0 setup from setup+1 onwards,
115 excluding the full matched string
117 Returns: TRUE if matched, or FALSE
121 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
123 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
124 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
125 PCRE_EOPT | options, md, pcre_gen_mtc_ctx);
128 if ((yield = (res >= 0)))
130 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
131 res = pcre2_get_ovector_count(md);
132 expand_nmax = setup < 0 ? 0 : setup + 1;
133 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
135 int off = matchnum * 2;
136 int len = ovec[off + 1] - ovec[off];
137 expand_nstring[expand_nmax] = string_copyn(subject + ovec[off], len);
138 expand_nlength[expand_nmax++] = len;
142 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
145 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
146 debug_printf_indent("pcre2: %s\n", errbuf);
148 /* pcre2_match_data_free(md); gen ctx needs no free */
153 /* Check just for match with regex. Uses the common memory-handling.
157 subject string to be checked
158 slen length of subject; -1 for nul-terminated
159 rptr pointer for matched string, copied, or NULL
161 Return: TRUE for a match.
165 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
167 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
168 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
169 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
170 0, PCRE_EOPT, md, pcre_gen_mtc_ctx);
171 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
177 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
180 /* pcre2_match_data_free(md); gen ctx needs no free */
186 /*************************************************
187 * Set up processing details *
188 *************************************************/
190 /* Save a text string for dumping when SIGUSR1 is received.
191 Do checks for overruns.
193 Arguments: format and arguments, as for printf()
198 set_process_info(const char *format, ...)
200 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
205 g = string_fmt_append(&gs, "%5d ", (int)getpid());
207 va_start(ap, format);
208 if (!string_vformat(g, 0, format, ap))
211 g = string_cat(&gs, US"**** string overflowed buffer ****");
213 g = string_catn(g, US"\n", 1);
214 string_from_gstring(g);
215 process_info_len = g->ptr;
216 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
220 /***********************************************
221 * Handler for SIGTERM *
222 ***********************************************/
225 term_handler(int sig)
231 /***********************************************
232 * Handler for SIGSEGV *
233 ***********************************************/
235 #define STACKDUMP_MAX 24
240 void * buf[STACKDUMP_MAX];
242 int nptrs = backtrace(buf, STACKDUMP_MAX);
244 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace\n");
245 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
246 if ((ss = backtrace_symbols(buf, nptrs)))
248 for (int i = 0; i < nptrs; i++)
249 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s\n", ss[i]);
253 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s\n", strerror(errno));
254 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
262 segv_handler(int sig, siginfo_t * info, void * uctx)
264 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
265 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
266 switch (info->si_code)
268 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
269 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
270 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
271 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
274 if (US info->si_addr < US 4096)
275 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
277 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
278 if (process_info_len > 0)
279 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
281 signal(SIGSEGV, SIG_DFL);
286 segv_handler(int sig)
288 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
289 if (process_info_len > 0)
290 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
292 signal(SIGSEGV, SIG_DFL);
298 /*************************************************
299 * Handler for SIGUSR1 *
300 *************************************************/
302 /* SIGUSR1 causes any exim process to write to the process log details of
303 what it is currently doing. It will only be used if the OS is capable of
304 setting up a handler that causes automatic restarting of any system call
305 that is in progress at the time.
307 This function takes care to be signal-safe.
309 Argument: the signal number (SIGUSR1)
314 usr1_handler(int sig)
318 os_restarting_signal(sig, usr1_handler);
320 if (!process_log_path) return;
321 fd = log_open_as_exim(process_log_path);
323 /* If we are neither exim nor root, or if we failed to create the log file,
324 give up. There is not much useful we can do with errors, since we don't want
325 to disrupt whatever is going on outside the signal handler. */
329 (void)write(fd, process_info, process_info_len);
335 /*************************************************
337 *************************************************/
339 /* This handler is enabled most of the time that Exim is running. The handler
340 doesn't actually get used unless alarm() has been called to set a timer, to
341 place a time limit on a system call of some kind. When the handler is run, it
344 There are some other SIGALRM handlers that are used in special cases when more
345 than just a flag setting is required; for example, when reading a message's
346 input. These are normally set up in the code module that uses them, and the
347 SIGALRM handler is reset to this one afterwards.
349 Argument: the signal value (SIGALRM)
354 sigalrm_handler(int sig)
357 os_non_restarting_signal(SIGALRM, sigalrm_handler);
362 /*************************************************
363 * Sleep for a fractional time interval *
364 *************************************************/
366 /* This function is called by millisleep() and exim_wait_tick() to wait for a
367 period of time that may include a fraction of a second. The coding is somewhat
368 tedious. We do not expect setitimer() ever to fail, but if it does, the process
369 will wait for ever, so we panic in this instance. (There was a case of this
370 when a bug in a function that calls milliwait() caused it to pass invalid data.
371 That's when I added the check. :-)
373 We assume it to be not worth sleeping for under 50us; this value will
374 require revisiting as hardware advances. This avoids the issue of
375 a zero-valued timer setting meaning "never fire".
377 Argument: an itimerval structure containing the interval
382 milliwait(struct itimerval *itval)
385 sigset_t old_sigmask;
386 int save_errno = errno;
388 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
390 (void)sigemptyset(&sigmask); /* Empty mask */
391 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
392 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
393 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
394 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
395 "setitimer() failed: %s", strerror(errno));
396 (void)sigfillset(&sigmask); /* All signals */
397 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
398 (void)sigsuspend(&sigmask); /* Until SIGALRM */
399 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
401 sigalrm_seen = FALSE;
407 /*************************************************
408 * Millisecond sleep function *
409 *************************************************/
411 /* The basic sleep() function has a granularity of 1 second, which is too rough
412 in some cases - for example, when using an increasing delay to slow down
415 Argument: number of millseconds
422 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
423 .it_value = {.tv_sec = msec/1000,
424 .tv_usec = (msec % 1000) * 1000}};
430 /*************************************************
431 * Compare microsecond times *
432 *************************************************/
439 Returns: -1, 0, or +1
443 exim_tvcmp(struct timeval *t1, struct timeval *t2)
445 if (t1->tv_sec > t2->tv_sec) return +1;
446 if (t1->tv_sec < t2->tv_sec) return -1;
447 if (t1->tv_usec > t2->tv_usec) return +1;
448 if (t1->tv_usec < t2->tv_usec) return -1;
455 /*************************************************
456 * Clock tick wait function *
457 *************************************************/
459 #ifdef _POSIX_MONOTONIC_CLOCK
460 # ifdef CLOCK_BOOTTIME
461 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
463 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
466 /* Amount EXIM_CLOCK is behind realtime, at startup. */
467 static struct timespec offset_ts;
470 exim_clock_init(void)
473 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
474 (void)gettimeofday(&tv, NULL);
475 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
476 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
477 if (offset_ts.tv_nsec >= 0) return;
479 offset_ts.tv_nsec += 1000*1000*1000;
485 exim_gettime(struct timeval * tv)
487 #ifdef _POSIX_MONOTONIC_CLOCK
488 struct timespec now_ts;
490 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
492 now_ts.tv_sec += offset_ts.tv_sec;
493 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
496 now_ts.tv_nsec -= 1000*1000*1000;
498 tv->tv_sec = now_ts.tv_sec;
499 tv->tv_usec = now_ts.tv_nsec / 1000;
503 (void)gettimeofday(tv, NULL);
507 /* Exim uses a time + a pid to generate a unique identifier in two places: its
508 message IDs, and in file names for maildir deliveries. Because some OS now
509 re-use pids within the same second, sub-second times are now being used.
510 However, for absolute certainty, we must ensure the clock has ticked before
511 allowing the relevant process to complete. At the time of implementation of
512 this code (February 2003), the speed of processors is such that the clock will
513 invariably have ticked already by the time a process has done its job. This
514 function prepares for the time when things are faster - and it also copes with
515 clocks that go backwards.
518 prev_tv A timeval which was used to create uniqueness; its usec field
519 has been rounded down to the value of the resolution.
520 We want to be sure the current time is greater than this.
521 On return, updated to current (rounded down).
522 resolution The resolution that was used to divide the microseconds
523 (1 for maildir, larger for message ids)
529 exim_wait_tick(struct timeval * prev_tv, int resolution)
531 struct timeval now_tv;
532 long int now_true_usec;
534 exim_gettime(&now_tv);
535 now_true_usec = now_tv.tv_usec;
536 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
538 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
540 struct itimerval itval;
541 itval.it_interval.tv_sec = 0;
542 itval.it_interval.tv_usec = 0;
543 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
544 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
546 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
547 negative value for the microseconds is possible only in the case when "now"
548 is more than a second less than "tgt". That means that itval.it_value.tv_sec
549 is greater than zero. The following correction is therefore safe. */
551 if (itval.it_value.tv_usec < 0)
553 itval.it_value.tv_usec += 1000000;
554 itval.it_value.tv_sec -= 1;
557 DEBUG(D_transport|D_receive)
559 if (!f.running_in_test_harness)
561 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
562 prev_tv->tv_sec, (long) prev_tv->tv_usec,
563 now_tv.tv_sec, (long) now_tv.tv_usec);
564 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
565 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
571 /* Be prapared to go around if the kernel does not implement subtick
572 granularity (GNU Hurd) */
574 exim_gettime(&now_tv);
575 now_true_usec = now_tv.tv_usec;
576 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
584 /*************************************************
585 * Call fopen() with umask 777 and adjust mode *
586 *************************************************/
588 /* Exim runs with umask(0) so that files created with open() have the mode that
589 is specified in the open() call. However, there are some files, typically in
590 the spool directory, that are created with fopen(). They end up world-writeable
591 if no precautions are taken. Although the spool directory is not accessible to
592 the world, this is an untidiness. So this is a wrapper function for fopen()
593 that sorts out the mode of the created file.
596 filename the file name
597 options the fopen() options
598 mode the required mode
600 Returns: the fopened FILE or NULL
604 modefopen(const uschar *filename, const char *options, mode_t mode)
606 mode_t saved_umask = umask(0777);
607 FILE *f = Ufopen(filename, options);
608 (void)umask(saved_umask);
609 if (f != NULL) (void)fchmod(fileno(f), mode);
614 /*************************************************
615 * Ensure stdin, stdout, and stderr exist *
616 *************************************************/
618 /* Some operating systems grumble if an exec() happens without a standard
619 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
620 file will be opened and will use these fd values, and then some other bit of
621 code will assume, for example, that it can write error messages to stderr.
622 This function ensures that fds 0, 1, and 2 are open if they do not already
623 exist, by connecting them to /dev/null.
625 This function is also used to ensure that std{in,out,err} exist at all times,
626 so that if any library that Exim calls tries to use them, it doesn't crash.
637 for (int i = 0; i <= 2; i++)
639 if (fstat(i, &statbuf) < 0 && errno == EBADF)
641 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
642 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
643 string_open_failed("/dev/null", NULL));
644 if (devnull != i) (void)dup2(devnull, i);
647 if (devnull > 2) (void)close(devnull);
653 /*************************************************
654 * Close unwanted file descriptors for delivery *
655 *************************************************/
657 /* This function is called from a new process that has been forked to deliver
658 an incoming message, either directly, or using exec.
660 We want any smtp input streams to be closed in this new process. However, it
661 has been observed that using fclose() here causes trouble. When reading in -bS
662 input, duplicate copies of messages have been seen. The files will be sharing a
663 file pointer with the parent process, and it seems that fclose() (at least on
664 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
665 least sometimes. Hence we go for closing the underlying file descriptors.
667 If TLS is active, we want to shut down the TLS library, but without molesting
668 the parent's SSL connection.
670 For delivery of a non-SMTP message, we want to close stdin and stdout (and
671 stderr unless debugging) because the calling process might have set them up as
672 pipes and be waiting for them to close before it waits for the submission
673 process to terminate. If they aren't closed, they hold up the calling process
674 until the initial delivery process finishes, which is not what we want.
676 Exception: We do want it for synchronous delivery!
678 And notwithstanding all the above, if D_resolver is set, implying resolver
679 debugging, leave stdout open, because that's where the resolver writes its
682 When we close stderr (which implies we've also closed stdout), we also get rid
683 of any controlling terminal.
695 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
697 (void)close(fileno(smtp_in));
698 (void)close(fileno(smtp_out));
703 (void)close(0); /* stdin */
704 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
705 if (debug_selector == 0) /* stderr */
707 if (!f.synchronous_delivery)
720 /*************************************************
722 *************************************************/
724 /* This function sets a new uid and gid permanently, optionally calling
725 initgroups() to set auxiliary groups. There are some special cases when running
726 Exim in unprivileged modes. In these situations the effective uid will not be
727 root; if we already have the right effective uid/gid, and don't need to
728 initialize any groups, leave things as they are.
733 igflag TRUE if initgroups() wanted
734 msg text to use in debugging output and failure log
736 Returns: nothing; bombs out on failure
740 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
742 uid_t euid = geteuid();
743 gid_t egid = getegid();
745 if (euid == root_uid || euid != uid || egid != gid || igflag)
747 /* At least one OS returns +1 for initgroups failure, so just check for
752 struct passwd *pw = getpwuid(uid);
754 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
755 "no passwd entry for uid=%ld", (long int)uid);
757 if (initgroups(pw->pw_name, gid) != 0)
758 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
759 (long int)uid, strerror(errno));
762 if (setgid(gid) < 0 || setuid(uid) < 0)
763 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
764 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
767 /* Debugging output included uid/gid and all groups */
771 int group_count, save_errno;
772 gid_t group_list[EXIM_GROUPLIST_SIZE];
773 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
774 (long int)geteuid(), (long int)getegid(), (long int)getpid());
775 group_count = getgroups(nelem(group_list), group_list);
777 debug_printf(" auxiliary group list:");
779 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
780 else if (group_count < 0)
781 debug_printf(" <error: %s>", strerror(save_errno));
782 else debug_printf(" <none>");
790 /*************************************************
792 *************************************************/
794 /* Exim exits via this function so that it always clears up any open
800 Returns: does not return
809 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
810 ">>>>>>>>>>>>>>>>\n",
811 (int)getpid(), process_purpose, rc);
817 exim_underbar_exit(int rc)
821 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
822 ">>>>>>>>>>>>>>>>\n",
823 (int)getpid(), process_purpose, rc);
829 /* Print error string, then die */
831 exim_fail(const char * fmt, ...)
835 vfprintf(stderr, fmt, ap);
839 /* fail if a length is too long */
841 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
843 if (itemlen <= maxlen)
845 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
846 itemlen, maxlen, description);
850 /* only pass through the string item back to the caller if it's short enough */
851 static inline const uschar *
852 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
854 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
858 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
859 of chown()/fchown(). See src/functions.h for more explanation */
861 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
863 int saved_errno = errno; /* from the preceeding chown call */
865 log_write(0, LOG_MAIN|LOG_PANIC,
866 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
867 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
868 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
870 /* I leave this here, commented, in case the "bug"(?) comes up again.
871 It is not an Exim bug, but we can provide a workaround.
877 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
879 if (buf.st_uid == owner && buf.st_gid == group) return 0;
880 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
882 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
890 /*************************************************
891 * Extract port from host address *
892 *************************************************/
894 /* Called to extract the port from the values given to -oMa and -oMi.
895 It also checks the syntax of the address, and terminates it before the
896 port data when a port is extracted.
899 address the address, with possible port on the end
901 Returns: the port, or zero if there isn't one
902 bombs out on a syntax error
906 check_port(uschar *address)
908 int port = host_address_extract_port(address);
909 if (string_is_ip_address(address, NULL) == 0)
910 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
916 /*************************************************
917 * Test/verify an address *
918 *************************************************/
920 /* This function is called by the -bv and -bt code. It extracts a working
921 address from a full RFC 822 address. This isn't really necessary per se, but it
922 has the effect of collapsing source routes.
926 flags flag bits for verify_address()
927 exit_value to be set for failures
933 test_address(uschar *s, int flags, int *exit_value)
935 int start, end, domain;
936 uschar *parse_error = NULL;
937 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
941 fprintf(stdout, "syntax error: %s\n", parse_error);
946 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
947 -1, -1, NULL, NULL, NULL);
948 if (rc == FAIL) *exit_value = 2;
949 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
955 /*************************************************
956 * Show supported features *
957 *************************************************/
960 show_string(BOOL is_stdout, gstring * g)
962 const uschar * s = string_from_gstring(g);
964 if (is_stdout) fputs(CCS s, stdout);
965 else debug_printf("%s", s);
970 show_db_version(gstring * g)
972 #ifdef DB_VERSION_STRING
975 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
976 g = string_fmt_append(g, " Runtime: %s\n",
977 db_version(NULL, NULL, NULL));
980 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
982 #elif defined(BTREEVERSION) && defined(HASHVERSION)
984 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
986 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
989 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
990 g = string_cat(g, US"Probably ndbm\n");
991 #elif defined(USE_TDB)
992 g = string_cat(g, US"Using tdb\n");
995 g = string_cat(g, US"Probably GDBM (native mode)\n");
997 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1004 /* This function is called for -bV/--version and for -d to output the optional
1005 features of the current Exim binary.
1007 Arguments: BOOL, true for stdout else debug channel
1012 show_whats_supported(BOOL is_stdout)
1014 rmark reset_point = store_mark();
1017 DEBUG(D_any) {} else g = show_db_version(g);
1019 g = string_cat(g, US"Support for:");
1020 #ifdef SUPPORT_CRYPTEQ
1021 g = string_cat(g, US" crypteq");
1024 g = string_cat(g, US" iconv()");
1027 g = string_cat(g, US" IPv6");
1029 #ifdef HAVE_SETCLASSRESOURCES
1030 g = string_cat(g, US" use_setclassresources");
1033 g = string_cat(g, US" PAM");
1036 g = string_cat(g, US" Perl");
1038 #ifdef EXPAND_DLFUNC
1039 g = string_cat(g, US" Expand_dlfunc");
1041 #ifdef USE_TCP_WRAPPERS
1042 g = string_cat(g, US" TCPwrappers");
1045 g = string_cat(g, US" GnuTLS");
1048 g = string_cat(g, US" OpenSSL");
1050 #ifndef DISABLE_TLS_RESUME
1051 g = string_cat(g, US" TLS_resume");
1053 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1054 g = string_cat(g, US" translate_ip_address");
1056 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1057 g = string_cat(g, US" move_frozen_messages");
1059 #ifdef WITH_CONTENT_SCAN
1060 g = string_cat(g, US" Content_Scanning");
1063 g = string_cat(g, US" DANE");
1065 #ifndef DISABLE_DKIM
1066 g = string_cat(g, US" DKIM");
1068 #ifdef SUPPORT_DMARC
1069 g = string_cat(g, US" DMARC");
1071 #ifndef DISABLE_DNSSEC
1072 g = string_cat(g, US" DNSSEC");
1074 #ifndef DISABLE_EVENT
1075 g = string_cat(g, US" Event");
1078 g = string_cat(g, US" I18N");
1080 #ifndef DISABLE_OCSP
1081 g = string_cat(g, US" OCSP");
1083 #ifndef DISABLE_PIPE_CONNECT
1084 g = string_cat(g, US" PIPECONNECT");
1086 #ifndef DISABLE_PRDR
1087 g = string_cat(g, US" PRDR");
1089 #ifdef SUPPORT_PROXY
1090 g = string_cat(g, US" PROXY");
1092 #ifndef DISABLE_QUEUE_RAMP
1093 g = string_cat(g, US" Queue_Ramp");
1095 #ifdef SUPPORT_SOCKS
1096 g = string_cat(g, US" SOCKS");
1099 g = string_cat(g, US" SPF");
1101 #if defined(SUPPORT_SRS)
1102 g = string_cat(g, US" SRS");
1106 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1108 #ifdef EXPERIMENTAL_ARC
1109 g = string_cat(g, US" Experimental_ARC");
1111 #ifdef EXPERIMENTAL_BRIGHTMAIL
1112 g = string_cat(g, US" Experimental_Brightmail");
1114 #ifdef EXPERIMENTAL_DCC
1115 g = string_cat(g, US" Experimental_DCC");
1117 #ifdef EXPERIMENTAL_DSN_INFO
1118 g = string_cat(g, US" Experimental_DSN_info");
1120 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1121 g = string_cat(g, US" Experimental_ESMTP_Limits");
1123 #ifdef EXPERIMENTAL_QUEUEFILE
1124 g = string_cat(g, US" Experimental_QUEUEFILE");
1126 g = string_cat(g, US"\n");
1128 g = string_cat(g, US"Lookups (built-in):");
1129 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1130 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1132 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1133 g = string_cat(g, US" cdb");
1135 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1136 g = string_cat(g, US" dbm dbmjz dbmnz");
1138 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1139 g = string_cat(g, US" dnsdb");
1141 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1142 g = string_cat(g, US" dsearch");
1144 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1145 g = string_cat(g, US" ibase");
1147 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1148 g = string_cat(g, US" json");
1150 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1151 g = string_cat(g, US" ldap ldapdn ldapm");
1154 g = string_cat(g, US" lmdb");
1156 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1157 g = string_cat(g, US" mysql");
1159 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1160 g = string_cat(g, US" nis nis0");
1162 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1163 g = string_cat(g, US" nisplus");
1165 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1166 g = string_cat(g, US" oracle");
1168 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1169 g = string_cat(g, US" passwd");
1171 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1172 g = string_cat(g, US" pgsql");
1174 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1175 g = string_cat(g, US" redis");
1177 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1178 g = string_cat(g, US" sqlite");
1180 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1181 g = string_cat(g, US" testdb");
1183 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1184 g = string_cat(g, US" whoson");
1186 g = string_cat(g, US"\n");
1188 g = auth_show_supported(g);
1189 g = route_show_supported(g);
1190 g = transport_show_supported(g);
1192 #ifdef WITH_CONTENT_SCAN
1193 g = malware_show_supported(g);
1195 show_string(is_stdout, g); g = NULL;
1197 if (fixed_never_users[0] > 0)
1200 g = string_cat(g, US"Fixed never_users: ");
1201 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1202 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1203 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1206 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1208 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1210 /* Everything else is details which are only worth reporting when debugging.
1211 Perhaps the tls_version_report should move into this too. */
1215 /* clang defines __GNUC__ (at least, for me) so test for it first */
1216 #if defined(__clang__)
1217 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1218 #elif defined(__GNUC__)
1219 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1223 "? unknown version ?"
1227 g = string_cat(g, US"Compiler: <unknown>\n");
1230 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1231 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1232 __GLIBC__, __GLIBC_MINOR__);
1233 if (__GLIBC_PREREQ(2, 1))
1234 g = string_fmt_append(g, " Runtime: %s\n",
1235 gnu_get_libc_version());
1238 g = show_db_version(g);
1241 g = tls_version_report(g);
1244 g = utf8_version_report(g);
1246 #ifdef SUPPORT_DMARC
1247 g = dmarc_version_report(g);
1250 g = spf_lib_version_report(g);
1253 show_string(is_stdout, g);
1256 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1257 if (authi->version_report)
1258 g = (*authi->version_report)(g);
1260 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1261 characters; unless it's an ancient version of PCRE in which case it
1263 #ifndef PCRE_PRERELEASE
1264 # define PCRE_PRERELEASE
1267 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1270 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1271 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1273 PCRE2_MAJOR, PCRE2_MINOR,
1274 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1278 #undef EXPAND_AND_QUOTE
1280 show_string(is_stdout, g);
1284 for (int i = 0; i < lookup_list_count; i++)
1285 if (lookup_list[i]->version_report)
1286 g = lookup_list[i]->version_report(g);
1287 show_string(is_stdout, g);
1290 #ifdef WHITELIST_D_MACROS
1291 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1293 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1295 #ifdef TRUSTED_CONFIG_LIST
1296 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1298 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1302 show_string(is_stdout, g);
1303 store_reset(reset_point);
1307 /*************************************************
1308 * Show auxiliary information about Exim *
1309 *************************************************/
1312 show_exim_information(enum commandline_info request, FILE *stream)
1317 fprintf(stream, "Oops, something went wrong.\n");
1321 "The -bI: flag takes a string indicating which information to provide.\n"
1322 "If the string is not recognised, you'll get this help (on stderr).\n"
1324 " exim -bI:help this information\n"
1325 " exim -bI:dscp list of known dscp value keywords\n"
1326 " exim -bI:sieve list of supported sieve extensions\n"
1330 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1331 fprintf(stream, "%s\n", *pp);
1334 dscp_list_to_stream(stream);
1340 /*************************************************
1341 * Quote a local part *
1342 *************************************************/
1344 /* This function is used when a sender address or a From: or Sender: header
1345 line is being created from the caller's login, or from an authenticated_id. It
1346 applies appropriate quoting rules for a local part.
1348 Argument: the local part
1349 Returns: the local part, quoted if necessary
1353 local_part_quote(uschar *lpart)
1355 BOOL needs_quote = FALSE;
1358 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1360 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1361 (*t != '.' || t == lpart || t[1] == 0);
1364 if (!needs_quote) return lpart;
1366 g = string_catn(NULL, US"\"", 1);
1370 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1373 g = string_cat(g, lpart);
1376 g = string_catn(g, lpart, nq - lpart);
1377 g = string_catn(g, US"\\", 1);
1378 g = string_catn(g, nq, 1);
1382 g = string_catn(g, US"\"", 1);
1383 return string_from_gstring(g);
1389 /*************************************************
1390 * Load readline() functions *
1391 *************************************************/
1393 /* This function is called from testing executions that read data from stdin,
1394 but only when running as the calling user. Currently, only -be does this. The
1395 function loads the readline() function library and passes back the functions.
1396 On some systems, it needs the curses library, so load that too, but try without
1397 it if loading fails. All this functionality has to be requested at build time.
1400 fn_readline_ptr pointer to where to put the readline pointer
1401 fn_addhist_ptr pointer to where to put the addhistory function
1403 Returns: the dlopen handle or NULL on failure
1407 set_readline(char * (**fn_readline_ptr)(const char *),
1408 void (**fn_addhist_ptr)(const char *))
1411 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1413 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1414 if (dlhandle_curses) dlclose(dlhandle_curses);
1418 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1419 * char * readline (const char *prompt);
1420 * void add_history (const char *string);
1422 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1423 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1426 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1434 /*************************************************
1435 * Get a line from stdin for testing things *
1436 *************************************************/
1438 /* This function is called when running tests that can take a number of lines
1439 of input (for example, -be and -bt). It handles continuations and trailing
1440 spaces. And prompting and a blank line output on eof. If readline() is in use,
1441 the arguments are non-NULL and provide the relevant functions.
1444 fn_readline readline function or NULL
1445 fn_addhist addhist function or NULL
1447 Returns: pointer to dynamic memory, or NULL at end of file
1451 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1454 BOOL had_input = FALSE;
1456 if (!fn_readline) { printf("> "); fflush(stdout); }
1458 for (int i = 0;; i++)
1460 uschar buffer[1024];
1464 char *readline_line = NULL;
1467 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1468 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1469 p = US readline_line;
1474 /* readline() not in use */
1477 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1481 /* Handle the line */
1484 ss = p + Ustrlen(p);
1485 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1488 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1490 g = string_catn(g, p, ss - p);
1493 if (fn_readline) free(readline_line);
1496 /* g can only be NULL if ss==p */
1497 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1500 --g->ptr; /* drop the \ */
1503 if (had_input) return g ? string_from_gstring(g) : US"";
1510 /*************************************************
1511 * Output usage information for the program *
1512 *************************************************/
1514 /* This function is called when there are no recipients
1515 or a specific --help argument was added.
1518 progname information on what name we were called by
1520 Returns: DOES NOT RETURN
1524 exim_usage(uschar *progname)
1527 /* Handle specific program invocation variants */
1528 if (Ustrcmp(progname, US"-mailq") == 0)
1530 "mailq - list the contents of the mail queue\n\n"
1531 "For a list of options, see the Exim documentation.\n");
1533 /* Generic usage - we output this whatever happens */
1535 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1536 "not directly from a shell command line. Options and/or arguments control\n"
1537 "what it does when called. For a list of options, see the Exim documentation.\n");
1542 /*************************************************
1543 * Validate that the macros given are okay *
1544 *************************************************/
1546 /* Typically, Exim will drop privileges if macros are supplied. In some
1547 cases, we want to not do so.
1549 Arguments: opt_D_used - true if the commandline had a "-D" option
1550 Returns: true if trusted, false otherwise
1554 macros_trusted(BOOL opt_D_used)
1556 #ifdef WHITELIST_D_MACROS
1557 uschar *whitelisted, *end, *p, **whites;
1558 int white_count, i, n;
1560 BOOL prev_char_item, found;
1565 #ifndef WHITELIST_D_MACROS
1569 /* We only trust -D overrides for some invoking users:
1570 root, the exim run-time user, the optional config owner user.
1571 I don't know why config-owner would be needed, but since they can own the
1572 config files anyway, there's no security risk to letting them override -D. */
1573 if ( ! ((real_uid == root_uid)
1574 || (real_uid == exim_uid)
1575 #ifdef CONFIGURE_OWNER
1576 || (real_uid == config_uid)
1580 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1584 /* Get a list of macros which are whitelisted */
1585 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1586 prev_char_item = FALSE;
1588 for (p = whitelisted; *p != '\0'; ++p)
1590 if (*p == ':' || isspace(*p))
1595 prev_char_item = FALSE;
1598 if (!prev_char_item)
1599 prev_char_item = TRUE;
1606 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1607 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1612 if (i == white_count)
1614 while (*p != '\0' && p < end)
1620 /* The list of commandline macros should be very short.
1621 Accept the N*M complexity. */
1622 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1625 for (uschar ** w = whites; *w; ++w)
1626 if (Ustrcmp(*w, m->name) == 0)
1633 if (!m->replacement)
1635 if ((len = m->replen) == 0)
1637 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1640 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1646 /*************************************************
1647 * Expansion testing *
1648 *************************************************/
1650 /* Expand and print one item, doing macro-processing.
1653 item line for expansion
1657 expansion_test_line(const uschar * line)
1663 Ustrncpy(big_buffer, line, big_buffer_size);
1664 big_buffer[big_buffer_size-1] = '\0';
1665 len = Ustrlen(big_buffer);
1667 (void) macros_expand(0, &len, &dummy_macexp);
1669 if (isupper(big_buffer[0]))
1671 if (macro_read_assignment(big_buffer))
1672 printf("Defined macro '%s'\n", mlast->name);
1674 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1675 printf("%s\n", acl_standalone_setvar(big_buffer+4));
1677 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1678 else printf("Failed: %s\n", expand_string_message);
1683 /*************************************************
1684 * Entry point and high-level code *
1685 *************************************************/
1687 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1688 the appropriate action. All the necessary functions are present in the one
1689 binary. I originally thought one should split it up, but it turns out that so
1690 much of the apparatus is needed in each chunk that one might as well just have
1691 it all available all the time, which then makes the coding easier as well.
1694 argc count of entries in argv
1695 argv argument strings, with argv[0] being the program name
1697 Returns: EXIT_SUCCESS if terminated successfully
1698 EXIT_FAILURE otherwise, except when a message has been sent
1699 to the sender, and -oee was given
1703 main(int argc, char **cargv)
1705 uschar **argv = USS cargv;
1706 int arg_receive_timeout = -1;
1707 int arg_smtp_receive_timeout = -1;
1708 int arg_error_handling = error_handling;
1709 int filter_sfd = -1;
1710 int filter_ufd = -1;
1713 int list_queue_option = 0;
1715 int msg_action_arg = -1;
1716 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1717 int queue_only_reason = 0;
1719 int perl_start_option = 0;
1721 int recipients_arg = argc;
1722 int sender_address_domain = 0;
1723 int test_retry_arg = -1;
1724 int test_rewrite_arg = -1;
1725 gid_t original_egid;
1726 BOOL arg_queue_only = FALSE;
1727 BOOL bi_option = FALSE;
1728 BOOL checking = FALSE;
1729 BOOL count_queue = FALSE;
1730 BOOL expansion_test = FALSE;
1731 BOOL extract_recipients = FALSE;
1732 BOOL flag_G = FALSE;
1733 BOOL flag_n = FALSE;
1734 BOOL forced_delivery = FALSE;
1735 BOOL f_end_dot = FALSE;
1736 BOOL deliver_give_up = FALSE;
1737 BOOL list_queue = FALSE;
1738 BOOL list_options = FALSE;
1739 BOOL list_config = FALSE;
1740 BOOL local_queue_only;
1741 BOOL one_msg_action = FALSE;
1742 BOOL opt_D_used = FALSE;
1743 BOOL queue_only_set = FALSE;
1744 BOOL receiving_message = TRUE;
1745 BOOL sender_ident_set = FALSE;
1746 BOOL session_local_queue_only;
1748 BOOL removed_privilege = FALSE;
1749 BOOL usage_wanted = FALSE;
1750 BOOL verify_address_mode = FALSE;
1751 BOOL verify_as_sender = FALSE;
1752 BOOL rcpt_verify_quota = FALSE;
1753 BOOL version_printed = FALSE;
1754 uschar *alias_arg = NULL;
1755 uschar *called_as = US"";
1756 uschar *cmdline_syslog_name = NULL;
1757 uschar *start_queue_run_id = NULL;
1758 uschar *stop_queue_run_id = NULL;
1759 uschar *expansion_test_message = NULL;
1760 const uschar *ftest_domain = NULL;
1761 const uschar *ftest_localpart = NULL;
1762 const uschar *ftest_prefix = NULL;
1763 const uschar *ftest_suffix = NULL;
1764 uschar *log_oneline = NULL;
1765 uschar *malware_test_file = NULL;
1766 uschar *real_sender_address;
1767 uschar *originator_home = US"/";
1771 struct stat statbuf;
1772 pid_t passed_qr_pid = (pid_t)0;
1773 int passed_qr_pipe = -1;
1774 gid_t group_list[EXIM_GROUPLIST_SIZE];
1776 /* For the -bI: flag */
1777 enum commandline_info info_flag = CMDINFO_NONE;
1778 BOOL info_stdout = FALSE;
1780 /* Possible options for -R and -S */
1782 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1784 /* Need to define this in case we need to change the environment in order
1785 to get rid of a bogus time zone. We have to make it char rather than uschar
1786 because some OS define it in /usr/include/unistd.h. */
1788 extern char **environ;
1790 #ifdef MEASURE_TIMING
1791 (void)gettimeofday(×tamp_startup, NULL);
1794 store_init(); /* Initialise the memory allocation susbsystem */
1795 pcre_init(); /* Set up memory handling for pcre */
1797 /* If the Exim user and/or group and/or the configuration file owner/group were
1798 defined by ref:name at build time, we must now find the actual uid/gid values.
1799 This is a feature to make the lives of binary distributors easier. */
1801 #ifdef EXIM_USERNAME
1802 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1805 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1807 /* If ref:name uses a number as the name, route_finduser() returns
1808 TRUE with exim_uid set and pw coerced to NULL. */
1810 exim_gid = pw->pw_gid;
1811 #ifndef EXIM_GROUPNAME
1814 "exim: ref:name should specify a usercode, not a group.\n"
1815 "exim: can't let you get away with it unless you also specify a group.\n");
1819 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1822 #ifdef EXIM_GROUPNAME
1823 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1824 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1827 #ifdef CONFIGURE_OWNERNAME
1828 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1829 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1830 CONFIGURE_OWNERNAME);
1833 /* We default the system_filter_user to be the Exim run-time user, as a
1834 sane non-root value. */
1835 system_filter_uid = exim_uid;
1837 #ifdef CONFIGURE_GROUPNAME
1838 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1839 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1840 CONFIGURE_GROUPNAME);
1843 /* In the Cygwin environment, some initialization used to need doing.
1844 It was fudged in by means of this macro; now no longer but we'll leave
1845 it in case of others. */
1851 /* Check a field which is patched when we are running Exim within its
1852 testing harness; do a fast initial check, and then the whole thing. */
1854 f.running_in_test_harness =
1855 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1856 if (f.running_in_test_harness)
1859 /* Protect against abusive argv[0] */
1860 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1861 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1863 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1864 at the start of a program; however, it seems that some environments do not
1865 follow this. A "strange" locale can affect the formatting of timestamps, so we
1868 setlocale(LC_ALL, "C");
1870 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1872 #ifdef _POSIX_MONOTONIC_CLOCK
1876 /* Set up the default handler for timing using alarm(). */
1878 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1880 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1881 because store_malloc writes a log entry on failure. */
1883 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1884 exim_fail("exim: failed to get store for log buffer\n");
1886 /* Initialize the default log options. */
1888 bits_set(log_selector, log_selector_size, log_default);
1890 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1891 NULL when the daemon is run and the file is closed. We have to use this
1892 indirection, because some systems don't allow writing to the variable "stderr".
1895 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1897 /* Ensure there is a big buffer for temporary use in several places. It is put
1898 in malloc store so that it can be freed for enlargement if necessary. */
1900 big_buffer = store_malloc(big_buffer_size);
1902 /* Set up the handler for the data request signal, and set the initial
1903 descriptive text. */
1905 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1906 set_process_info("initializing");
1907 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1910 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1911 sigaction(SIGSEGV, &act, NULL);
1914 signal(SIGSEGV, segv_handler); /* log faults */
1917 /* If running in a dockerized environment, the TERM signal is only
1918 delegated to the PID 1 if we request it by setting an signal handler */
1919 if (getpid() == 1) signal(SIGTERM, term_handler);
1921 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1922 in the daemon code. For the rest of Exim's uses, we ignore it. */
1924 signal(SIGHUP, SIG_IGN);
1926 /* We don't want to die on pipe errors as the code is written to handle
1927 the write error instead. */
1929 signal(SIGPIPE, SIG_IGN);
1931 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1932 set to SIG_IGN. This causes subprocesses that complete before the parent
1933 process waits for them not to hang around, so when Exim calls wait(), nothing
1934 is there. The wait() code has been made robust against this, but let's ensure
1935 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1936 ending status. We use sigaction rather than plain signal() on those OS where
1937 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1938 problem on AIX with this.) */
1942 struct sigaction act;
1943 act.sa_handler = SIG_DFL;
1944 sigemptyset(&(act.sa_mask));
1946 sigaction(SIGCHLD, &act, NULL);
1949 signal(SIGCHLD, SIG_DFL);
1952 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1957 /* Set up the version number. Set up the leading 'E' for the external form of
1958 message ids, set the pointer to the internal form, and initialize it to
1959 indicate no message being processed. */
1962 message_id_option[0] = '-';
1963 message_id_external = message_id_option + 1;
1964 message_id_external[0] = 'E';
1965 message_id = message_id_external + 1;
1968 /* Set the umask to zero so that any files Exim creates using open() are
1969 created with the modes that it specifies. NOTE: Files created with fopen() have
1970 a problem, which was not recognized till rather late (February 2006). With this
1971 umask, such files will be world writeable. (They are all content scanning files
1972 in the spool directory, which isn't world-accessible, so this is not a
1973 disaster, but it's untidy.) I don't want to change this overall setting,
1974 however, because it will interact badly with the open() calls. Instead, there's
1975 now a function called modefopen() that fiddles with the umask while calling
1980 /* Precompile the regular expression for matching a message id. Keep this in
1981 step with the code that generates ids in the accept.c module. We need to do
1982 this here, because the -M options check their arguments for syntactic validity
1983 using mac_ismsgid, which uses this. */
1986 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", MCS_NOFLAGS, TRUE);
1988 /* Precompile the regular expression that is used for matching an SMTP error
1989 code, possibly extended, at the start of an error message. Note that the
1990 terminating whitespace character is included. */
1993 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1996 #ifdef WHITELIST_D_MACROS
1997 /* Precompile the regular expression used to filter the content of macros
1998 given to -D for permissibility. */
2000 regex_whitelisted_macro =
2001 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2004 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2005 this seems to be a generally accepted convention, since one finds symbolic
2006 links called "mailq" in standard OS configurations. */
2008 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2009 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2012 receiving_message = FALSE;
2013 called_as = US"-mailq";
2016 /* If the program is called as "rmail" treat it as equivalent to
2017 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2018 i.e. preventing a single dot on a line from terminating the message, and
2019 returning with zero return code, even in cases of error (provided an error
2020 message has been sent). */
2022 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2023 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2026 called_as = US"-rmail";
2027 errors_sender_rc = EXIT_SUCCESS;
2030 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2031 this is a smail convention. */
2033 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2034 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2036 smtp_input = smtp_batched_input = TRUE;
2037 called_as = US"-rsmtp";
2040 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2041 this is a smail convention. */
2043 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2044 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2047 receiving_message = FALSE;
2048 called_as = US"-runq";
2051 /* If the program is called as "newaliases" treat it as equivalent to
2052 "exim -bi"; this is a sendmail convention. */
2054 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2055 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2058 receiving_message = FALSE;
2059 called_as = US"-newaliases";
2062 /* Save the original effective uid for a couple of uses later. It should
2063 normally be root, but in some esoteric environments it may not be. */
2065 original_euid = geteuid();
2066 original_egid = getegid();
2068 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2069 to be the same as the real ones. This makes a difference only if Exim is setuid
2070 (or setgid) to something other than root, which could be the case in some
2071 special configurations. */
2073 real_uid = getuid();
2074 real_gid = getgid();
2076 if (real_uid == root_uid)
2078 if ((rv = setgid(real_gid)))
2079 exim_fail("exim: setgid(%ld) failed: %s\n",
2080 (long int)real_gid, strerror(errno));
2081 if ((rv = setuid(real_uid)))
2082 exim_fail("exim: setuid(%ld) failed: %s\n",
2083 (long int)real_uid, strerror(errno));
2086 /* If neither the original real uid nor the original euid was root, Exim is
2087 running in an unprivileged state. */
2089 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2091 /* For most of the args-parsing we need to use permanent pool memory */
2093 int old_pool = store_pool;
2094 store_pool = POOL_PERM;
2096 /* Scan the program's arguments. Some can be dealt with right away; others are
2097 simply recorded for checking and handling afterwards. Do a high-level switch
2098 on the second character (the one after '-'), to save some effort. */
2100 for (i = 1; i < argc; i++)
2102 BOOL badarg = FALSE;
2103 uschar * arg = argv[i];
2107 /* An argument not starting with '-' is the start of a recipients list;
2108 break out of the options-scanning loop. */
2116 /* An option consisting of -- terminates the options */
2118 if (Ustrcmp(arg, "--") == 0)
2120 recipients_arg = i + 1;
2124 /* Handle flagged options */
2126 switchchar = arg[1];
2129 /* Make all -ex options synonymous with -oex arguments, since that
2130 is assumed by various callers. Also make -qR options synonymous with -R
2131 options, as that seems to be required as well. Allow for -qqR too, and
2132 the same for -S options. */
2134 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2135 Ustrncmp(arg+1, "qR", 2) == 0 ||
2136 Ustrncmp(arg+1, "qS", 2) == 0)
2138 switchchar = arg[2];
2141 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2143 switchchar = arg[3];
2145 f.queue_2stage = TRUE;
2148 /* Make -r synonymous with -f, since it is a documented alias */
2150 else if (arg[1] == 'r') switchchar = 'f';
2152 /* Make -ov synonymous with -v */
2154 else if (Ustrcmp(arg, "-ov") == 0)
2160 /* deal with --option_aliases */
2161 else if (switchchar == '-')
2163 if (Ustrcmp(argrest, "help") == 0)
2165 usage_wanted = TRUE;
2168 else if (Ustrcmp(argrest, "version") == 0)
2175 /* High-level switch on active initial letter */
2180 /* sendmail uses -Ac and -Am to control which .cf file is used;
2183 if (!*argrest) { badarg = TRUE; break; }
2186 BOOL ignore = FALSE;
2191 if (*(argrest + 1) == '\0')
2195 if (!ignore) badarg = TRUE;
2199 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2200 so has no need of it. */
2203 if (!*argrest) i++; /* Skip over the type */
2209 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2213 /* -bd: Run in daemon mode, awaiting SMTP connections.
2214 -bdf: Ditto, but in the foreground.
2217 f.daemon_listen = f.daemon_scion = TRUE;
2218 if (*argrest == 'f') f.background_daemon = FALSE;
2219 else if (*argrest) badarg = TRUE;
2222 /* -be: Run in expansion test mode
2223 -bem: Ditto, but read a message from a file first
2226 expansion_test = checking = TRUE;
2227 if (*argrest == 'm')
2229 if (++i >= argc) { badarg = TRUE; break; }
2230 expansion_test_message = argv[i];
2233 if (*argrest) badarg = TRUE;
2236 /* -bF: Run system filter test */
2238 filter_test |= checking = FTEST_SYSTEM;
2239 if (*argrest) badarg = TRUE;
2240 else if (++i < argc) filter_test_sfile = argv[i];
2241 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2244 /* -bf: Run user filter test
2245 -bfd: Set domain for filter testing
2246 -bfl: Set local part for filter testing
2247 -bfp: Set prefix for filter testing
2248 -bfs: Set suffix for filter testing
2253 filter_test |= checking = FTEST_USER;
2254 if (++i < argc) filter_test_ufile = argv[i];
2255 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2260 exim_fail("exim: string expected after %s\n", arg);
2261 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2262 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2263 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2264 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2269 /* -bh: Host checking - an IP address must follow. */
2271 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2273 if (++i >= argc) { badarg = TRUE; break; }
2274 sender_host_address = string_copy_taint(
2275 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2277 host_checking = checking = f.log_testing_mode = TRUE;
2278 f.host_checking_callout = *argrest == 'c';
2279 message_logs = FALSE;
2284 /* -bi: This option is used by sendmail to initialize *the* alias file,
2285 though it has the -oA option to specify a different file. Exim has no
2286 concept of *the* alias file, but since Sun's YP make script calls
2287 sendmail this way, some support must be provided. */
2289 if (!*argrest) bi_option = TRUE;
2293 /* -bI: provide information, of the type to follow after a colon.
2294 This is an Exim flag. */
2296 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2298 uschar *p = argrest+1;
2299 info_flag = CMDINFO_HELP;
2301 if (strcmpic(p, CUS"sieve") == 0)
2303 info_flag = CMDINFO_SIEVE;
2306 else if (strcmpic(p, CUS"dscp") == 0)
2308 info_flag = CMDINFO_DSCP;
2311 else if (strcmpic(p, CUS"help") == 0)
2317 /* -bm: Accept and deliver message - the default option. Reinstate
2318 receiving_message, which got turned off for all -b options.
2319 -bmalware: test the filename given for malware */
2321 if (!*argrest) receiving_message = TRUE;
2322 else if (Ustrcmp(argrest, "alware") == 0)
2324 if (++i >= argc) { badarg = TRUE; break; }
2326 malware_test_file = argv[i];
2331 /* -bnq: For locally originating messages, do not qualify unqualified
2332 addresses. In the envelope, this causes errors; in header lines they
2335 if (Ustrcmp(argrest, "q") == 0)
2337 f.allow_unqualified_sender = FALSE;
2338 f.allow_unqualified_recipient = FALSE;
2343 /* -bpxx: List the contents of the mail queue, in various forms. If
2344 the option is -bpc, just a queue count is needed. Otherwise, if the
2345 first letter after p is r, then order is random. */
2347 if (*argrest == 'c')
2350 if (*++argrest) badarg = TRUE;
2354 if (*argrest == 'r')
2356 list_queue_option = 8;
2359 else list_queue_option = 0;
2363 /* -bp: List the contents of the mail queue, top-level only */
2367 /* -bpu: List the contents of the mail queue, top-level undelivered */
2369 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2371 /* -bpa: List the contents of the mail queue, including all delivered */
2373 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2375 /* Unknown after -bp[r] */
2381 /* -bP: List the configuration variables given as the address list.
2382 Force -v, so configuration errors get displayed. */
2385 /* -bP config: we need to setup here, because later,
2386 when list_options is checked, the config is read already */
2389 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2392 readconf_save_config(version_string);
2396 list_options = TRUE;
2397 debug_selector |= D_v;
2398 debug_file = stderr;
2402 /* -brt: Test retry configuration lookup */
2404 if (Ustrcmp(argrest, "t") == 0)
2407 test_retry_arg = i + 1;
2411 /* -brw: Test rewrite configuration */
2413 else if (Ustrcmp(argrest, "w") == 0)
2416 test_rewrite_arg = i + 1;
2422 /* -bS: Read SMTP commands on standard input, but produce no replies -
2423 all errors are reported by sending messages. */
2426 smtp_input = smtp_batched_input = receiving_message = TRUE;
2430 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2431 on standard output. */
2433 if (!*argrest) smtp_input = receiving_message = TRUE;
2437 /* -bt: address testing mode */
2440 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2444 /* -bv: verify addresses */
2447 verify_address_mode = checking = f.log_testing_mode = TRUE;
2449 /* -bvs: verify sender addresses */
2451 else if (Ustrcmp(argrest, "s") == 0)
2453 verify_address_mode = checking = f.log_testing_mode = TRUE;
2454 verify_as_sender = TRUE;
2459 /* -bV: Print version string and support details */
2463 printf("Exim version %s #%s built %s\n", version_string,
2464 version_cnumber, version_date);
2465 printf("%s\n", CS version_copyright);
2466 version_printed = TRUE;
2467 show_whats_supported(TRUE);
2468 f.log_testing_mode = TRUE;
2473 /* -bw: inetd wait mode, accept a listening socket as stdin */
2475 f.inetd_wait_mode = TRUE;
2476 f.background_daemon = FALSE;
2477 f.daemon_listen = f.daemon_scion = TRUE;
2479 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2480 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2491 /* -C: change configuration file list; ignore if it isn't really
2492 a change! Enforce a prefix check if required. */
2496 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2497 if (Ustrcmp(config_main_filelist, argrest) != 0)
2499 #ifdef ALT_CONFIG_PREFIX
2501 int len = Ustrlen(ALT_CONFIG_PREFIX);
2502 const uschar *list = argrest;
2504 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2505 while((filename = string_nextinlist(&list, &sep, big_buffer,
2507 if ( ( Ustrlen(filename) < len
2508 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2509 || Ustrstr(filename, "/../") != NULL
2511 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2513 exim_fail("-C Permission denied\n");
2515 if (real_uid != root_uid)
2517 #ifdef TRUSTED_CONFIG_LIST
2519 if (real_uid != exim_uid
2520 #ifdef CONFIGURE_OWNER
2521 && real_uid != config_uid
2524 f.trusted_config = FALSE;
2527 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2530 struct stat statbuf;
2532 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2533 (statbuf.st_uid != root_uid /* owner not root */
2534 #ifdef CONFIGURE_OWNER
2535 && statbuf.st_uid != config_uid /* owner not the special one */
2538 (statbuf.st_gid != root_gid /* group not root */
2539 #ifdef CONFIGURE_GROUP
2540 && statbuf.st_gid != config_gid /* group not the special one */
2542 && (statbuf.st_mode & 020) != 0 /* group writeable */
2544 (statbuf.st_mode & 2) != 0) /* world writeable */
2546 f.trusted_config = FALSE;
2551 /* Well, the trust list at least is up to scratch... */
2553 uschar *trusted_configs[32];
2556 int old_pool = store_pool;
2557 store_pool = POOL_MAIN;
2559 reset_point = store_mark();
2560 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2562 uschar *start = big_buffer, *nl;
2563 while (*start && isspace(*start))
2567 nl = Ustrchr(start, '\n');
2570 trusted_configs[nr_configs++] = string_copy(start);
2571 if (nr_configs == nelem(trusted_configs))
2579 const uschar *list = argrest;
2581 while (f.trusted_config && (filename = string_nextinlist(&list,
2582 &sep, big_buffer, big_buffer_size)))
2584 for (i=0; i < nr_configs; i++)
2585 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2587 if (i == nr_configs)
2589 f.trusted_config = FALSE;
2594 else /* No valid prefixes found in trust_list file. */
2595 f.trusted_config = FALSE;
2596 store_reset(reset_point);
2597 store_pool = old_pool;
2600 else /* Could not open trust_list file. */
2601 f.trusted_config = FALSE;
2604 /* Not root; don't trust config */
2605 f.trusted_config = FALSE;
2609 config_main_filelist = argrest;
2610 f.config_changed = TRUE;
2615 /* -D: set up a macro definition */
2618 #ifdef DISABLE_D_OPTION
2619 exim_fail("exim: -D is not available in this Exim binary\n");
2625 uschar *s = argrest;
2628 while (isspace(*s)) s++;
2630 if (*s < 'A' || *s > 'Z')
2631 exim_fail("exim: macro name set by -D must start with "
2632 "an upper case letter\n");
2634 while (isalnum(*s) || *s == '_')
2636 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2640 if (ptr == 0) { badarg = TRUE; break; }
2641 while (isspace(*s)) s++;
2644 if (*s++ != '=') { badarg = TRUE; break; }
2645 while (isspace(*s)) s++;
2648 for (m = macros_user; m; m = m->next)
2649 if (Ustrcmp(m->name, name) == 0)
2650 exim_fail("exim: duplicated -D in command line\n");
2652 m = macro_create(name, s, TRUE);
2654 if (clmacro_count >= MAX_CLMACROS)
2655 exim_fail("exim: too many -D options on command line\n");
2656 clmacros[clmacro_count++] =
2657 string_sprintf("-D%s=%s", m->name, m->replacement);
2664 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2666 if (Ustrcmp(argrest, "ropcr") == 0)
2668 /* drop_cr = TRUE; */
2671 /* -dp: Set up a debug pretrigger buffer with given size. */
2673 else if (Ustrcmp(argrest, "p") == 0)
2677 debug_pretrigger_setup(argv[i]);
2679 /* -dt: Set a debug trigger selector */
2681 else if (Ustrncmp(argrest, "t=", 2) == 0)
2682 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2684 /* -d: Set debug level (see also -v below).
2685 If -dd is used, debugging subprocesses of the daemon is disabled. */
2689 /* Use an intermediate variable so that we don't set debugging while
2690 decoding the debugging bits. */
2692 unsigned int selector = D_default;
2695 if (*argrest == 'd')
2697 f.debug_daemon = TRUE;
2701 decode_bits(&selector, 1, debug_notall, argrest,
2702 debug_options, debug_options_count, US"debug", 0);
2703 debug_selector = selector;
2708 /* -E: This is a local error message. This option is not intended for
2709 external use at all, but is not restricted to trusted callers because it
2710 does no harm (just suppresses certain error messages) and if Exim is run
2711 not setuid root it won't always be trusted when it generates error
2712 messages using this option. If there is a message id following -E, point
2713 message_reference at it, for logging. */
2716 f.local_error_message = TRUE;
2717 if (mac_ismsgid(argrest)) message_reference = argrest;
2721 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2722 option, so it looks as if historically the -oex options are also callable
2723 without the leading -o. So we have to accept them. Before the switch,
2724 anything starting -oe has been converted to -e. Exim does not support all
2725 of the sendmail error options. */
2728 if (Ustrcmp(argrest, "e") == 0)
2730 arg_error_handling = ERRORS_SENDER;
2731 errors_sender_rc = EXIT_SUCCESS;
2733 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2734 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2735 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2736 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2741 /* -F: Set sender's full name, used instead of the gecos entry from
2742 the password file. Since users can usually alter their gecos entries,
2743 there's no security involved in using this instead. The data can follow
2744 the -F or be in the next argument. */
2748 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2749 originator_name = string_copy_taint(
2750 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2752 f.sender_name_forced = TRUE;
2756 /* -f: Set sender's address - this value is only actually used if Exim is
2757 run by a trusted user, or if untrusted_set_sender is set and matches the
2758 address, except that the null address can always be set by any user. The
2759 test for this happens later, when the value given here is ignored when not
2760 permitted. For an untrusted user, the actual sender is still put in Sender:
2761 if it doesn't match the From: header (unless no_local_from_check is set).
2762 The data can follow the -f or be in the next argument. The -r switch is an
2763 obsolete form of -f but since there appear to be programs out there that
2764 use anything that sendmail has ever supported, better accept it - the
2765 synonymizing is done before the switch above.
2767 At this stage, we must allow domain literal addresses, because we don't
2768 know what the setting of allow_domain_literals is yet. Ditto for trailing
2769 dots and strip_trailing_dot. */
2773 int dummy_start, dummy_end;
2776 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2777 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2779 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2782 uschar * temp = argrest + Ustrlen(argrest) - 1;
2783 while (temp >= argrest && isspace(*temp)) temp--;
2784 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2785 allow_domain_literals = TRUE;
2786 strip_trailing_dot = TRUE;
2788 allow_utf8_domains = TRUE;
2790 if (!(sender_address = parse_extract_address(argrest, &errmess,
2791 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2792 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2794 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2796 message_smtputf8 = string_is_utf8(sender_address);
2797 allow_utf8_domains = FALSE;
2799 allow_domain_literals = FALSE;
2800 strip_trailing_dot = FALSE;
2802 f.sender_address_forced = TRUE;
2806 /* -G: sendmail invocation to specify that it's a gateway submission and
2807 sendmail may complain about problems instead of fixing them.
2808 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2809 not at this time complain about problems. */
2815 /* -h: Set the hop count for an incoming message. Exim does not currently
2816 support this; it always computes it by counting the Received: headers.
2817 To put it in will require a change to the spool header file format. */
2821 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2822 if (!isdigit(*argrest)) badarg = TRUE;
2826 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2827 not to be documented for sendmail but mailx (at least) uses it) */
2830 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2834 /* -L: set the identifier used for syslog; equivalent to setting
2835 syslog_processname in the config file, but needs to be an admin option. */
2839 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2840 if ((sz = Ustrlen(argrest)) > 32)
2841 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2843 exim_fail("exim: the -L syslog name is too short\n");
2844 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2848 receiving_message = FALSE;
2850 /* -MC: continue delivery of another message via an existing open
2851 file descriptor. This option is used for an internal call by the
2852 smtp transport when there is a pending message waiting to go to an
2853 address to which it has got a connection. Five subsequent arguments are
2854 required: transport name, host name, IP address, sequence number, and
2855 message_id. Transports may decline to create new processes if the sequence
2856 number gets too big. The channel is stdin. This (-MC) must be the last
2857 argument. There's a subsequent check that the real-uid is privileged.
2859 If we are running in the test harness. delay for a bit, to let the process
2860 that set this one up complete. This makes for repeatability of the logging,
2863 if (Ustrcmp(argrest, "C") == 0)
2865 union sockaddr_46 interface_sock;
2866 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2869 exim_fail("exim: too many or too few arguments after -MC\n");
2871 if (msg_action_arg >= 0)
2872 exim_fail("exim: incompatible arguments\n");
2874 continue_transport = string_copy_taint(
2875 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2877 continue_hostname = string_copy_taint(
2878 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2880 continue_host_address = string_copy_taint(
2881 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2883 continue_sequence = Uatoi(argv[++i]);
2884 msg_action = MSG_DELIVER;
2885 msg_action_arg = ++i;
2886 forced_delivery = TRUE;
2887 queue_run_pid = passed_qr_pid;
2888 queue_run_pipe = passed_qr_pipe;
2890 if (!mac_ismsgid(argv[i]))
2891 exim_fail("exim: malformed message id %s after -MC option\n",
2894 /* Set up $sending_ip_address and $sending_port, unless proxied */
2896 if (!continue_proxy_cipher)
2897 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2899 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2902 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2905 testharness_pause_ms(500);
2909 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2913 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2914 precedes -MC (see above). The flag indicates that the host to which
2915 Exim is connected has accepted an AUTH sequence. */
2917 case 'A': f.smtp_authenticated = TRUE; break;
2919 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2920 that exim is connected to supports the esmtp extension DSN */
2922 case 'D': smtp_peer_options |= OPTION_DSN; break;
2924 /* -MCd: for debug, set a process-purpose string */
2926 case 'd': if (++i < argc)
2927 process_purpose = string_copy_taint(
2928 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2933 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2934 from the commandline should be tainted - but we will need an untainted
2935 value for the spoolfile when doing a -odi delivery process. */
2937 case 'G': if (++i < argc) queue_name = string_copy_taint(
2938 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2943 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2945 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2947 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2948 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2949 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2951 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2953 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2958 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2959 it preceded -MC (see above) */
2961 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2963 #ifdef SUPPORT_SOCKS
2964 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2965 case 'p': proxy_session = TRUE;
2968 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
2971 proxy_local_port = Uatoi(argv[i]);
2974 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
2977 proxy_external_port = Uatoi(argv[i]);
2983 /* -MCQ: pass on the pid of the queue-running process that started
2984 this chain of deliveries and the fd of its synchronizing pipe; this
2985 is useful only when it precedes -MC (see above) */
2987 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2989 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2993 /* -MCq: do a quota check on the given recipient for the given size
2994 of message. Separate from -MC. */
2995 case 'q': rcpt_verify_quota = TRUE;
2996 if (++i < argc) message_size = Uatoi(argv[i]);
3000 /* -MCS: set the smtp_use_size flag; this is useful only when it
3001 precedes -MC (see above) */
3003 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3006 /* -MCs: used with -MCt; SNI was sent */
3007 /* -MCr: ditto, DANE */
3010 case 's': if (++i < argc)
3012 continue_proxy_sni = string_copy_taint(
3013 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3015 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3020 /* -MCt: similar to -MCT below but the connection is still open
3021 via a proxy process which handles the TLS context and coding.
3022 Require three arguments for the proxied local address and port,
3023 and the TLS cipher. */
3025 case 't': if (++i < argc)
3026 sending_ip_address = string_copy_taint(
3027 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3031 sending_port = (int)(Uatol(argv[i]));
3034 continue_proxy_cipher = string_copy_taint(
3035 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3040 /* -MCT: set the tls_offered flag; this is useful only when it
3041 precedes -MC (see above). The flag indicates that the host to which
3042 Exim is connected has offered TLS support. */
3044 case 'T': smtp_peer_options |= OPTION_TLS; break;
3047 default: badarg = TRUE; break;
3052 /* -M[x]: various operations on the following list of message ids:
3053 -M deliver the messages, ignoring next retry times and thawing
3054 -Mc deliver the messages, checking next retry times, no thawing
3055 -Mf freeze the messages
3056 -Mg give up on the messages
3057 -Mt thaw the messages
3058 -Mrm remove the messages
3059 In the above cases, this must be the last option. There are also the
3060 following options which are followed by a single message id, and which
3061 act on that message. Some of them use the "recipient" addresses as well.
3062 -Mar add recipient(s)
3063 -MG move to a different queue
3064 -Mmad mark all recipients delivered
3065 -Mmd mark recipients(s) delivered
3067 -Mset load a message for use with -be
3069 -Mvc show copy (of whole message, in RFC 2822 format)
3076 msg_action = MSG_DELIVER;
3077 forced_delivery = f.deliver_force_thaw = TRUE;
3079 else if (Ustrcmp(argrest, "ar") == 0)
3081 msg_action = MSG_ADD_RECIPIENT;
3082 one_msg_action = TRUE;
3084 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3085 else if (Ustrcmp(argrest, "es") == 0)
3087 msg_action = MSG_EDIT_SENDER;
3088 one_msg_action = TRUE;
3090 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3091 else if (Ustrcmp(argrest, "g") == 0)
3093 msg_action = MSG_DELIVER;
3094 deliver_give_up = TRUE;
3096 else if (Ustrcmp(argrest, "G") == 0)
3098 msg_action = MSG_SETQUEUE;
3099 queue_name_dest = string_copy_taint(
3100 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3103 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3104 else if (Ustrcmp(argrest, "md") == 0)
3106 msg_action = MSG_MARK_DELIVERED;
3107 one_msg_action = TRUE;
3109 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3110 else if (Ustrcmp(argrest, "set") == 0)
3112 msg_action = MSG_LOAD;
3113 one_msg_action = TRUE;
3115 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3116 else if (Ustrcmp(argrest, "vb") == 0)
3118 msg_action = MSG_SHOW_BODY;
3119 one_msg_action = TRUE;
3121 else if (Ustrcmp(argrest, "vc") == 0)
3123 msg_action = MSG_SHOW_COPY;
3124 one_msg_action = TRUE;
3126 else if (Ustrcmp(argrest, "vh") == 0)
3128 msg_action = MSG_SHOW_HEADER;
3129 one_msg_action = TRUE;
3131 else if (Ustrcmp(argrest, "vl") == 0)
3133 msg_action = MSG_SHOW_LOG;
3134 one_msg_action = TRUE;
3136 else { badarg = TRUE; break; }
3138 /* All the -Mxx options require at least one message id. */
3140 msg_action_arg = i + 1;
3141 if (msg_action_arg >= argc)
3142 exim_fail("exim: no message ids given after %s option\n", arg);
3144 /* Some require only message ids to follow */
3146 if (!one_msg_action)
3148 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3149 exim_fail("exim: malformed message id %s after %s option\n",
3151 goto END_ARG; /* Remaining args are ids */
3154 /* Others require only one message id, possibly followed by addresses,
3155 which will be handled as normal arguments. */
3159 if (!mac_ismsgid(argv[msg_action_arg]))
3160 exim_fail("exim: malformed message id %s after %s option\n",
3161 argv[msg_action_arg], arg);
3167 /* Some programs seem to call the -om option without the leading o;
3168 for sendmail it askes for "me too". Exim always does this. */
3171 if (*argrest) badarg = TRUE;
3175 /* -N: don't do delivery - a debugging option that stops transports doing
3176 their thing. It implies debugging at the D_v level. */
3181 f.dont_deliver = TRUE;
3182 debug_selector |= D_v;
3183 debug_file = stderr;
3189 /* -n: This means "don't alias" in sendmail, apparently.
3190 For normal invocations, it has no effect.
3191 It may affect some other options. */
3197 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3198 option to the specified value. This form uses long names. We need to handle
3199 -O option=value and -Ooption=value. */
3204 exim_fail("exim: string expected after -O\n");
3210 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3213 if (!*(alias_arg = argrest))
3214 if (i+1 < argc) alias_arg = argv[++i];
3215 else exim_fail("exim: string expected after -oA\n");
3218 /* -oB: Set a connection message max value for remote deliveries */
3221 uschar * p = argrest;
3223 if (i+1 < argc && isdigit((argv[i+1][0])))
3227 connection_max_messages = 1;
3234 exim_fail("exim: number expected after -oB\n");
3235 connection_max_messages = Uatoi(p);
3240 /* -odb: background delivery */
3243 if (Ustrcmp(argrest, "b") == 0)
3245 f.synchronous_delivery = FALSE;
3246 arg_queue_only = FALSE;
3247 queue_only_set = TRUE;
3250 /* -odd: testsuite-only: add no inter-process delays */
3252 else if (Ustrcmp(argrest, "d") == 0)
3253 f.testsuite_delays = FALSE;
3255 /* -odf: foreground delivery (smail-compatible option); same effect as
3256 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3259 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3261 f.synchronous_delivery = TRUE;
3262 arg_queue_only = FALSE;
3263 queue_only_set = TRUE;
3266 /* -odq: queue only */
3268 else if (Ustrcmp(argrest, "q") == 0)
3270 f.synchronous_delivery = FALSE;
3271 arg_queue_only = TRUE;
3272 queue_only_set = TRUE;
3275 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3276 but no remote delivery */
3278 else if (Ustrcmp(argrest, "qs") == 0)
3280 f.queue_smtp = TRUE;
3281 arg_queue_only = FALSE;
3282 queue_only_set = TRUE;
3287 /* -oex: Sendmail error flags. As these are also accepted without the
3288 leading -o prefix, for compatibility with vacation and other callers,
3289 they are handled with -e above. */
3291 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3292 -oitrue: Another sendmail syntax for the same */
3295 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3300 /* -oM*: Set various characteristics for an incoming message; actually
3301 acted on for trusted callers only. */
3306 exim_fail("exim: data expected after -oM%s\n", argrest);
3308 /* -oMa: Set sender host address */
3310 if (Ustrcmp(argrest, "a") == 0)
3311 sender_host_address = string_copy_taint(
3312 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3315 /* -oMaa: Set authenticator name */
3317 else if (Ustrcmp(argrest, "aa") == 0)
3318 sender_host_authenticated = string_copy_taint(
3319 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3322 /* -oMas: setting authenticated sender */
3324 else if (Ustrcmp(argrest, "as") == 0)
3325 authenticated_sender = string_copy_taint(
3326 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3329 /* -oMai: setting authenticated id */
3331 else if (Ustrcmp(argrest, "ai") == 0)
3332 authenticated_id = string_copy_taint(
3333 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMai"),
3336 /* -oMi: Set incoming interface address */
3338 else if (Ustrcmp(argrest, "i") == 0)
3339 interface_address = string_copy_taint(
3340 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3343 /* -oMm: Message reference */
3345 else if (Ustrcmp(argrest, "m") == 0)
3347 if (!mac_ismsgid(argv[i+1]))
3348 exim_fail("-oMm must be a valid message ID\n");
3349 if (!f.trusted_config)
3350 exim_fail("-oMm must be called by a trusted user/config\n");
3351 message_reference = argv[++i];
3354 /* -oMr: Received protocol */
3356 else if (Ustrcmp(argrest, "r") == 0)
3358 if (received_protocol)
3359 exim_fail("received_protocol is set already\n");
3361 received_protocol = string_copy_taint(
3362 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3365 /* -oMs: Set sender host name */
3367 else if (Ustrcmp(argrest, "s") == 0)
3368 sender_host_name = string_copy_taint(
3369 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3372 /* -oMt: Set sender ident */
3374 else if (Ustrcmp(argrest, "t") == 0)
3376 sender_ident_set = TRUE;
3377 sender_ident = string_copy_taint(
3378 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3382 /* Else a bad argument */
3389 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3390 seem to call this as -m (undocumented), so that is also accepted (see
3392 /* -oo: An ancient flag for old-style addresses which still seems to
3393 crop up in some calls (see in SCO). */
3397 if (*argrest) badarg = TRUE;
3400 /* -oP <name>: set pid file path for daemon
3401 -oPX: delete pid file of daemon */
3404 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3405 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3406 "(uid=%d euid=%d | %d)\n",
3407 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3408 if (!*argrest) override_pid_file_path = argv[++i];
3409 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3414 /* -or <n>: set timeout for non-SMTP acceptance
3415 -os <n>: set timeout for SMTP acceptance */
3420 int * tp = argrest[-1] == 'r'
3421 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3423 *tp = readconf_readtime(argrest, 0, FALSE);
3424 else if (i+1 < argc)
3425 *tp = readconf_readtime(argv[++i], 0, FALSE);
3428 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3432 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3433 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3436 if (*argrest) badarg = TRUE;
3437 else override_local_interfaces = string_copy_taint(
3438 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3442 /* -oY: Override creation of daemon notifier socket */
3445 if (*argrest) badarg = TRUE;
3446 else notifier_socket = NULL;
3449 /* Unknown -o argument */
3457 /* -ps: force Perl startup; -pd force delayed Perl startup */
3461 if (*argrest == 's' && argrest[1] == 0)
3463 perl_start_option = 1;
3466 if (*argrest == 'd' && argrest[1] == 0)
3468 perl_start_option = -1;
3473 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3474 which sets the host protocol and host name */
3477 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3481 uschar * hn = Ustrchr(argrest, ':');
3483 if (received_protocol)
3484 exim_fail("received_protocol is set already\n");
3487 received_protocol = string_copy_taint(
3488 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3492 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3493 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3494 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3501 receiving_message = FALSE;
3502 if (queue_interval >= 0)
3503 exim_fail("exim: -q specified more than once\n");
3505 /* -qq...: Do queue runs in a 2-stage manner */
3507 if (*argrest == 'q')
3509 f.queue_2stage = TRUE;
3513 /* -qi...: Do only first (initial) deliveries */
3515 if (*argrest == 'i')
3517 f.queue_run_first_delivery = TRUE;
3521 /* -qf...: Run the queue, forcing deliveries
3522 -qff..: Ditto, forcing thawing as well */
3524 if (*argrest == 'f')
3526 f.queue_run_force = TRUE;
3527 if (*++argrest == 'f')
3529 f.deliver_force_thaw = TRUE;
3534 /* -q[f][f]l...: Run the queue only on local deliveries */
3536 if (*argrest == 'l')
3538 f.queue_run_local = TRUE;
3542 /* -q[f][f][l][G<name>]... Work on the named queue */
3544 if (*argrest == 'G')
3547 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3548 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3549 queue_name = string_copyn(argrest, i);
3551 if (*argrest == '/') argrest++;
3554 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3555 only, optionally named, optionally starting from a given message id. */
3557 if (!(list_queue || count_queue))
3559 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3562 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3563 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3564 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3565 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3568 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3569 forced, optionally local only, optionally named. */
3571 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3573 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3577 case 'R': /* Synonymous with -qR... */
3579 const uschar *tainted_selectstr;
3581 receiving_message = FALSE;
3583 /* -Rf: As -R (below) but force all deliveries,
3584 -Rff: Ditto, but also thaw all frozen messages,
3585 -Rr: String is regex
3586 -Rrf: Regex and force
3587 -Rrff: Regex and force and thaw
3589 in all cases provided there are no further characters in this
3593 for (int i = 0; i < nelem(rsopts); i++)
3594 if (Ustrcmp(argrest, rsopts[i]) == 0)
3596 if (i != 2) f.queue_run_force = TRUE;
3597 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3598 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3599 argrest += Ustrlen(rsopts[i]);
3602 /* -R: Set string to match in addresses for forced queue run to
3603 pick out particular messages. */
3605 /* Avoid attacks from people providing very long strings, and do so before
3608 tainted_selectstr = argrest;
3609 else if (i+1 < argc)
3610 tainted_selectstr = argv[++i];
3612 exim_fail("exim: string expected after -R\n");
3613 deliver_selectstring = string_copy_taint(
3614 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3619 /* -r: an obsolete synonym for -f (see above) */
3622 /* -S: Like -R but works on sender. */
3624 case 'S': /* Synonymous with -qS... */
3626 const uschar *tainted_selectstr;
3628 receiving_message = FALSE;
3630 /* -Sf: As -S (below) but force all deliveries,
3631 -Sff: Ditto, but also thaw all frozen messages,
3632 -Sr: String is regex
3633 -Srf: Regex and force
3634 -Srff: Regex and force and thaw
3636 in all cases provided there are no further characters in this
3640 for (int i = 0; i < nelem(rsopts); i++)
3641 if (Ustrcmp(argrest, rsopts[i]) == 0)
3643 if (i != 2) f.queue_run_force = TRUE;
3644 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3645 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3646 argrest += Ustrlen(rsopts[i]);
3649 /* -S: Set string to match in addresses for forced queue run to
3650 pick out particular messages. */
3653 tainted_selectstr = argrest;
3654 else if (i+1 < argc)
3655 tainted_selectstr = argv[++i];
3657 exim_fail("exim: string expected after -S\n");
3658 deliver_selectstring_sender = string_copy_taint(
3659 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3664 /* -Tqt is an option that is exclusively for use by the testing suite.
3665 It is not recognized in other circumstances. It allows for the setting up
3666 of explicit "queue times" so that various warning/retry things can be
3667 tested. Otherwise variability of clock ticks etc. cause problems. */
3670 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3671 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3676 /* -t: Set flag to extract recipients from body of message. */
3679 if (!*argrest) extract_recipients = TRUE;
3681 /* -ti: Set flag to extract recipients from body of message, and also
3682 specify that dot does not end the message. */
3684 else if (Ustrcmp(argrest, "i") == 0)
3686 extract_recipients = TRUE;
3690 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3693 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3700 /* -U: This means "initial user submission" in sendmail, apparently. The
3701 doc claims that in future sendmail may refuse syntactically invalid
3702 messages instead of fixing them. For the moment, we just ignore it. */
3708 /* -v: verify things - this is a very low-level debugging */
3713 debug_selector |= D_v;
3714 debug_file = stderr;
3720 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3722 The -x flag tells the sendmail command that mail from a local
3723 mail program has National Language Support (NLS) extended characters
3724 in the body of the mail item. The sendmail command can send mail with
3725 extended NLS characters across networks that normally corrupts these
3728 As Exim is 8-bit clean, it just ignores this flag. */
3731 if (*argrest) badarg = TRUE;
3734 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3735 logs to that file. We swallow the parameter and otherwise ignore it. */
3740 exim_fail("exim: string expected after -X\n");
3743 /* -z: a line of text to log */
3748 log_oneline = string_copy_taint(
3749 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3752 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3755 /* All other initial characters are errors */
3760 } /* End of high-level switch statement */
3762 /* Failed to recognize the option, or syntax error */
3765 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3766 "option %s\n", arg);
3770 /* If -R or -S have been specified without -q, assume a single queue run. */
3772 if ( (deliver_selectstring || deliver_selectstring_sender)
3773 && queue_interval < 0)
3778 store_pool = old_pool;
3781 /* If usage_wanted is set we call the usage function - which never returns */
3782 if (usage_wanted) exim_usage(called_as);
3784 /* Arguments have been processed. Check for incompatibilities. */
3785 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3786 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3787 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3788 || filter_test != FTEST_NONE
3789 || msg_action_arg > 0 && !one_msg_action
3791 || ( msg_action_arg > 0
3792 && ( f.daemon_listen || queue_interval > 0 || list_options
3793 || checking && msg_action != MSG_LOAD
3794 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3796 || ( (f.daemon_listen || queue_interval > 0)
3797 && ( sender_address || list_options || list_queue || checking
3800 || f.daemon_listen && queue_interval == 0
3801 || f.inetd_wait_mode && queue_interval >= 0
3803 && ( checking || smtp_input || extract_recipients
3804 || filter_test != FTEST_NONE || bi_option
3806 || ( verify_address_mode
3807 && ( f.address_test_mode || smtp_input || extract_recipients
3808 || filter_test != FTEST_NONE || bi_option
3810 || ( f.address_test_mode
3811 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3815 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3817 || deliver_selectstring && queue_interval < 0
3818 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3820 exim_fail("exim: incompatible command-line options or arguments\n");
3822 /* If debugging is set up, set the file and the file descriptor to pass on to
3823 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3824 to run in the foreground. */
3826 if (debug_selector != 0)
3828 debug_file = stderr;
3829 debug_fd = fileno(debug_file);
3830 f.background_daemon = FALSE;
3831 testharness_pause_ms(100); /* lets caller finish */
3832 if (debug_selector != D_v) /* -v only doesn't show this */
3834 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3835 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3837 if (!version_printed)
3838 show_whats_supported(FALSE);
3842 /* When started with root privilege, ensure that the limits on the number of
3843 open files and the number of processes (where that is accessible) are
3844 sufficiently large, or are unset, in case Exim has been called from an
3845 environment where the limits are screwed down. Not all OS have the ability to
3846 change some of these limits. */
3850 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3856 #ifdef RLIMIT_NOFILE
3857 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3859 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3861 rlp.rlim_cur = rlp.rlim_max = 0;
3864 /* I originally chose 1000 as a nice big number that was unlikely to
3865 be exceeded. It turns out that some older OS have a fixed upper limit of
3868 if (rlp.rlim_cur < 1000)
3870 rlp.rlim_cur = rlp.rlim_max = 1000;
3871 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3873 rlp.rlim_cur = rlp.rlim_max = 256;
3874 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3875 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3882 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3884 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3886 rlp.rlim_cur = rlp.rlim_max = 0;
3889 # ifdef RLIM_INFINITY
3890 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3892 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3894 if (rlp.rlim_cur < 1000)
3896 rlp.rlim_cur = rlp.rlim_max = 1000;
3898 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3899 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3905 /* Exim is normally entered as root (but some special configurations are
3906 possible that don't do this). However, it always spins off sub-processes that
3907 set their uid and gid as required for local delivery. We don't want to pass on
3908 any extra groups that root may belong to, so we want to get rid of them all at
3911 We need to obey setgroups() at this stage, before possibly giving up root
3912 privilege for a changed configuration file, but later on we might need to
3913 check on the additional groups for the admin user privilege - can't do that
3914 till after reading the config, which might specify the exim gid. Therefore,
3915 save the group list here first. */
3917 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3918 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3920 /* There is a fundamental difference in some BSD systems in the matter of
3921 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3922 known not to be different. On the "different" systems there is a single group
3923 list, and the first entry in it is the current group. On all other versions of
3924 Unix there is a supplementary group list, which is in *addition* to the current
3925 group. Consequently, to get rid of all extraneous groups on a "standard" system
3926 you pass over 0 groups to setgroups(), while on a "different" system you pass
3927 over a single group - the current group, which is always the first group in the
3928 list. Calling setgroups() with zero groups on a "different" system results in
3929 an error return. The following code should cope with both types of system.
3931 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3932 the "setgroups() with zero groups" - and changes the egid.
3933 Thanks to that we had to stash the original_egid above, for use below
3934 in the call to exim_setugid().
3936 However, if this process isn't running as root, setgroups() can't be used
3937 since you have to be root to run it, even if throwing away groups.
3938 Except, sigh, for Hurd - where you can.
3939 Not being root here happens only in some unusual configurations. */
3942 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3943 && setgroups(0, NULL) != 0
3945 && setgroups(1, group_list) != 0)
3946 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3948 /* If the configuration file name has been altered by an argument on the
3949 command line (either a new file name or a macro definition) and the caller is
3950 not root, or if this is a filter testing run, remove any setuid privilege the
3951 program has and run as the underlying user.
3953 The exim user is locked out of this, which severely restricts the use of -C
3956 Otherwise, set the real ids to the effective values (should be root unless run
3957 from inetd, which it can either be root or the exim uid, if one is configured).
3959 There is a private mechanism for bypassing some of this, in order to make it
3960 possible to test lots of configurations automatically, without having either to
3961 recompile each time, or to patch in an actual configuration file name and other
3962 values (such as the path name). If running in the test harness, pretend that
3963 configuration file changes and macro definitions haven't happened. */
3966 (!f.trusted_config || /* Config changed, or */
3967 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3968 real_uid != root_uid && /* Not root, and */
3969 !f.running_in_test_harness /* Not fudged */
3971 expansion_test /* expansion testing */
3973 filter_test != FTEST_NONE) /* Filter testing */
3975 setgroups(group_count, group_list);
3976 exim_setugid(real_uid, real_gid, FALSE,
3977 US"-C, -D, -be or -bf forces real uid");
3978 removed_privilege = TRUE;
3980 /* In the normal case when Exim is called like this, stderr is available
3981 and should be used for any logging information because attempts to write
3982 to the log will usually fail. To arrange this, we unset really_exim. However,
3983 if no stderr is available there is no point - we might as well have a go
3984 at the log (if it fails, syslog will be written).
3986 Note that if the invoker is Exim, the logs remain available. Messing with
3987 this causes unlogged successful deliveries. */
3989 if (log_stderr && real_uid != exim_uid)
3990 f.really_exim = FALSE;
3993 /* Privilege is to be retained for the moment. It may be dropped later,
3994 depending on the job that this Exim process has been asked to do. For now, set
3995 the real uid to the effective so that subsequent re-execs of Exim are done by a
3999 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4001 /* If testing a filter, open the file(s) now, before wasting time doing other
4002 setups and reading the message. */
4004 if (filter_test & FTEST_SYSTEM)
4005 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4006 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4009 if (filter_test & FTEST_USER)
4010 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4011 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4014 /* Initialise lookup_list
4015 If debugging, already called above via version reporting.
4016 In either case, we initialise the list of available lookups while running
4017 as root. All dynamically modules are loaded from a directory which is
4018 hard-coded into the binary and is code which, if not a module, would be
4019 part of Exim already. Ability to modify the content of the directory
4020 is equivalent to the ability to modify a setuid binary!
4022 This needs to happen before we read the main configuration. */
4025 /*XXX this excrescence could move to the testsuite standard config setup file */
4027 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4030 /* Read the main runtime configuration data; this gives up if there
4031 is a failure. It leaves the configuration file open so that the subsequent
4032 configuration data for delivery can be read if needed.
4034 NOTE: immediately after opening the configuration file we change the working
4035 directory to "/"! Later we change to $spool_directory. We do it there, because
4036 during readconf_main() some expansion takes place already. */
4038 /* Store the initial cwd before we change directories. Can be NULL if the
4039 dir has already been unlinked. */
4040 initial_cwd = os_getcwd(NULL, 0);
4041 if (!initial_cwd && errno)
4042 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4044 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4045 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4048 -be[m] expansion test -
4049 -b[fF] filter test new
4051 -bmalware malware_test_file new
4053 -brw rewrite test new
4055 -bv[s] address verify -
4057 -bP <option> (except -bP config, which sets list_config)
4059 If any of these options is set, we suppress warnings about configuration
4060 issues (currently about tls_advertise_hosts and keep_environment not being
4064 int old_pool = store_pool;
4065 #ifdef MEASURE_TIMING
4067 (void)gettimeofday(&t0, NULL);
4070 store_pool = POOL_CONFIG;
4071 readconf_main(checking || list_options);
4072 store_pool = old_pool;
4074 #ifdef MEASURE_TIMING
4075 report_time_since(&t0, US"readconf_main (delta)");
4079 /* Now in directory "/" */
4081 if (cleanup_environment() == FALSE)
4082 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4085 /* If an action on specific messages is requested, or if a daemon or queue
4086 runner is being started, we need to know if Exim was called by an admin user.
4087 This is the case if the real user is root or exim, or if the real group is
4088 exim, or if one of the supplementary groups is exim or a group listed in
4089 admin_groups. We don't fail all message actions immediately if not admin_user,
4090 since some actions can be performed by non-admin users. Instead, set admin_user
4091 for later interrogation. */
4093 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4094 f.admin_user = TRUE;
4096 for (int i = 0; i < group_count && !f.admin_user; i++)
4097 if (group_list[i] == exim_gid)
4098 f.admin_user = TRUE;
4099 else if (admin_groups)
4100 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4101 if (admin_groups[j] == group_list[i])
4102 f.admin_user = TRUE;
4104 /* Another group of privileged users are the trusted users. These are root,
4105 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4106 are permitted to specify sender_addresses with -f on the command line, and
4107 other message parameters as well. */
4109 if (real_uid == root_uid || real_uid == exim_uid)
4110 f.trusted_caller = TRUE;
4114 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4115 if (trusted_users[i] == real_uid)
4116 f.trusted_caller = TRUE;
4119 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4120 if (trusted_groups[i] == real_gid)
4121 f.trusted_caller = TRUE;
4122 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4123 if (trusted_groups[i] == group_list[j])
4124 f.trusted_caller = TRUE;
4127 /* At this point, we know if the user is privileged and some command-line
4128 options become possibly impermissible, depending upon the configuration file. */
4130 if (checking && commandline_checks_require_admin && !f.admin_user)
4131 exim_fail("exim: those command-line flags are set to require admin\n");
4133 /* Handle the decoding of logging options. */
4135 decode_bits(log_selector, log_selector_size, log_notall,
4136 log_selector_string, log_options, log_options_count, US"log", 0);
4140 debug_printf("configuration file is %s\n", config_main_filename);
4141 debug_printf("log selectors =");
4142 for (int i = 0; i < log_selector_size; i++)
4143 debug_printf(" %08x", log_selector[i]);
4147 /* If domain literals are not allowed, check the sender address that was
4148 supplied with -f. Ditto for a stripped trailing dot. */
4152 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4153 exim_fail("exim: bad -f address \"%s\": domain literals not "
4154 "allowed\n", sender_address);
4155 if (f_end_dot && !strip_trailing_dot)
4156 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4157 "(trailing dot not allowed)\n", sender_address);
4160 /* See if an admin user overrode our logging. */
4162 if (cmdline_syslog_name)
4165 syslog_processname = cmdline_syslog_name;
4166 log_file_path = string_copy(CUS"syslog");
4169 /* not a panic, non-privileged users should not be able to spam paniclog */
4171 "exim: you lack sufficient privilege to specify syslog process name\n");
4173 /* Paranoia check of maximum lengths of certain strings. There is a check
4174 on the length of the log file path in log.c, which will come into effect
4175 if there are any calls to write the log earlier than this. However, if we
4176 get this far but the string is very long, it is better to stop now than to
4177 carry on and (e.g.) receive a message and then have to collapse. The call to
4178 log_write() from here will cause the ultimate panic collapse if the complete
4179 file name exceeds the buffer length. */
4181 if (Ustrlen(log_file_path) > 200)
4182 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4183 "log_file_path is longer than 200 chars: aborting");
4185 if (Ustrlen(pid_file_path) > 200)
4186 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4187 "pid_file_path is longer than 200 chars: aborting");
4189 if (Ustrlen(spool_directory) > 200)
4190 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4191 "spool_directory is longer than 200 chars: aborting");
4193 /* Length check on the process name given to syslog for its TAG field,
4194 which is only permitted to be 32 characters or less. See RFC 3164. */
4196 if (Ustrlen(syslog_processname) > 32)
4197 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4198 "syslog_processname is longer than 32 chars: aborting");
4203 log_write(0, LOG_MAIN, "%s", log_oneline);
4204 return EXIT_SUCCESS;
4207 return EXIT_FAILURE;
4209 /* In some operating systems, the environment variable TMPDIR controls where
4210 temporary files are created; Exim doesn't use these (apart from when delivering
4211 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4212 If TMPDIR is found in the environment, reset it to the value defined in the
4213 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4214 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4215 EXIM_TMPDIR by the build scripts.
4219 if (environ) for (uschar ** p = USS environ; *p; p++)
4220 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4222 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4223 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4225 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4229 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4230 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4231 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4232 called by a user who has set the TZ variable. This then affects the timestamps
4233 in log files and in Received: headers, and any created Date: header lines. The
4234 required timezone is settable in the configuration file, so nothing can be done
4235 about this earlier - but hopefully nothing will normally be logged earlier than
4236 this. We have to make a new environment if TZ is wrong, but don't bother if
4237 timestamps_utc is set, because then all times are in UTC anyway. */
4239 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4240 f.timestamps_utc = TRUE;
4243 uschar *envtz = US getenv("TZ");
4245 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4246 : timezone_string != NULL
4249 uschar **p = USS environ;
4253 if (environ) while (*p++) count++;
4254 if (!envtz) count++;
4255 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4256 if (environ) for (p = USS environ; *p; p++)
4257 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4258 if (timezone_string)
4260 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4261 sprintf(CS *newp++, "TZ=%s", timezone_string);
4266 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4267 tod_stamp(tod_log));
4271 /* Handle the case when we have removed the setuid privilege because of -C or
4272 -D. This means that the caller of Exim was not root.
4274 There is a problem if we were running as the Exim user. The sysadmin may
4275 expect this case to retain privilege because "the binary was called by the
4276 Exim user", but it hasn't, because either the -D option set macros, or the
4277 -C option set a non-trusted configuration file. There are two possibilities:
4279 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4280 to do message deliveries. Thus, the fact that it is running as a
4281 non-privileged user is plausible, and might be wanted in some special
4282 configurations. However, really_exim will have been set false when
4283 privilege was dropped, to stop Exim trying to write to its normal log
4284 files. Therefore, re-enable normal log processing, assuming the sysadmin
4285 has set up the log directory correctly.
4287 (2) If deliver_drop_privilege is not set, the configuration won't work as
4288 apparently intended, and so we log a panic message. In order to retain
4289 root for -C or -D, the caller must either be root or be invoking a
4290 trusted configuration file (when deliver_drop_privilege is false). */
4292 if ( removed_privilege
4293 && (!f.trusted_config || opt_D_used)
4294 && real_uid == exim_uid)
4295 if (deliver_drop_privilege)
4296 f.really_exim = TRUE; /* let logging work normally */
4298 log_write(0, LOG_MAIN|LOG_PANIC,
4299 "exim user lost privilege for using %s option",
4300 f.trusted_config? "-D" : "-C");
4302 /* Start up Perl interpreter if Perl support is configured and there is a
4303 perl_startup option, and the configuration or the command line specifies
4304 initializing starting. Note that the global variables are actually called
4305 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4308 if (perl_start_option != 0)
4309 opt_perl_at_start = (perl_start_option > 0);
4310 if (opt_perl_at_start && opt_perl_startup != NULL)
4313 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4314 if ((errstr = init_perl(opt_perl_startup)))
4315 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4316 opt_perl_started = TRUE;
4318 #endif /* EXIM_PERL */
4320 /* Log the arguments of the call if the configuration file said so. This is
4321 a debugging feature for finding out what arguments certain MUAs actually use.
4322 Don't attempt it if logging is disabled, or if listing variables or if
4323 verifying/testing addresses or expansions. */
4325 if ( (debug_selector & D_any || LOGGING(arguments))
4326 && f.really_exim && !list_options && !checking)
4328 uschar *p = big_buffer;
4329 Ustrcpy(p, US"cwd= (failed)");
4336 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4337 p += Ustrlen(CCS p);
4340 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4342 for (int i = 0; i < argc; i++)
4344 int len = Ustrlen(argv[i]);
4345 const uschar *printing;
4347 if (p + len + 8 >= big_buffer + big_buffer_size)
4349 Ustrcpy(p, US" ...");
4350 log_write(0, LOG_MAIN, "%s", big_buffer);
4351 Ustrcpy(big_buffer, US"...");
4354 printing = string_printing(argv[i]);
4355 if (!*printing) quote = US"\"";
4358 const uschar *pp = printing;
4360 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4362 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4363 (p - big_buffer) - 4), printing, quote);
4366 if (LOGGING(arguments))
4367 log_write(0, LOG_MAIN, "%s", big_buffer);
4369 debug_printf("%s\n", big_buffer);
4372 /* Set the working directory to be the top-level spool directory. We don't rely
4373 on this in the code, which always uses fully qualified names, but it's useful
4374 for core dumps etc. Don't complain if it fails - the spool directory might not
4375 be generally accessible and calls with the -C option (and others) have lost
4376 privilege by now. Before the chdir, we try to ensure that the directory exists.
4379 if (Uchdir(spool_directory) != 0)
4381 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4382 (void) Uchdir(spool_directory);
4385 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4386 alias file. Exim doesn't have such a concept, but this call is screwed into
4387 Sun's YP makefiles. Handle this by calling a configured script, as the real
4388 user who called Exim. The -oA option can be used to pass an argument to the
4393 (void) fclose(config_file);
4394 if (bi_command && *bi_command)
4398 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4399 if (alias_arg) argv[i++] = alias_arg;
4402 setgroups(group_count, group_list);
4403 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4405 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4406 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4408 execv(CS argv[0], (char *const *)argv);
4409 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4413 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4418 /* We moved the admin/trusted check to be immediately after reading the
4419 configuration file. We leave these prints here to ensure that syslog setup,
4420 logfile setup, and so on has already happened. */
4422 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4423 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4425 /* Only an admin user may start the daemon or force a queue run in the default
4426 configuration, but the queue run restriction can be relaxed. Only an admin
4427 user may request that a message be returned to its sender forthwith. Only an
4428 admin user may specify a debug level greater than D_v (because it might show
4429 passwords, etc. in lookup queries). Only an admin user may request a queue
4430 count. Only an admin user can use the test interface to scan for email
4431 (because Exim will be in the spool dir and able to look at mails). */
4435 BOOL debugset = (debug_selector & ~D_v) != 0;
4436 if ( deliver_give_up || f.daemon_listen || malware_test_file
4437 || count_queue && queue_list_requires_admin
4438 || list_queue && queue_list_requires_admin
4439 || queue_interval >= 0 && prod_requires_admin
4440 || queue_name_dest && prod_requires_admin
4441 || debugset && !f.running_in_test_harness
4443 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4446 /* If the real user is not root or the exim uid, the argument for passing
4447 in an open TCP/IP connection for another message is not permitted, nor is
4448 running with the -N option for any delivery action, unless this call to exim is
4449 one that supplied an input message, or we are using a patched exim for
4450 regression testing. */
4452 if ( real_uid != root_uid && real_uid != exim_uid
4453 && ( continue_hostname
4455 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4457 && !f.running_in_test_harness
4459 exim_fail("exim: Permission denied\n");
4461 /* If the caller is not trusted, certain arguments are ignored when running for
4462 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4463 Note that authority for performing certain actions on messages is tested in the
4464 queue_action() function. */
4466 if (!f.trusted_caller && !checking)
4468 sender_host_name = sender_host_address = interface_address =
4469 sender_ident = received_protocol = NULL;
4470 sender_host_port = interface_port = 0;
4471 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4474 /* If a sender host address is set, extract the optional port number off the
4475 end of it and check its syntax. Do the same thing for the interface address.
4476 Exim exits if the syntax is bad. */
4480 if (sender_host_address)
4481 sender_host_port = check_port(sender_host_address);
4482 if (interface_address)
4483 interface_port = check_port(interface_address);
4486 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4489 if (f.trusted_caller)
4491 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4492 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4495 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4498 /* If an SMTP message is being received check to see if the standard input is a
4499 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4500 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4505 union sockaddr_46 inetd_sock;
4506 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4507 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4509 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4510 if (family == AF_INET || family == AF_INET6)
4512 union sockaddr_46 interface_sock;
4513 size = sizeof(interface_sock);
4515 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4516 interface_address = host_ntoa(-1, &interface_sock, NULL,
4519 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4521 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4524 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4525 NULL, &sender_host_port);
4526 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4527 "inetd is not supported when mua_wrapper is set");
4531 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4536 /* If the load average is going to be needed while receiving a message, get it
4537 now for those OS that require the first call to os_getloadavg() to be done as
4538 root. There will be further calls later for each message received. */
4540 #ifdef LOAD_AVG_NEEDS_ROOT
4541 if ( receiving_message
4542 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4543 load_average = OS_GETLOADAVG();
4546 /* The queue_only configuration option can be overridden by -odx on the command
4547 line, except that if queue_only_override is false, queue_only cannot be unset
4548 from the command line. */
4550 if (queue_only_set && (queue_only_override || arg_queue_only))
4551 queue_only = arg_queue_only;
4553 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4556 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4557 if (arg_smtp_receive_timeout >= 0)
4558 smtp_receive_timeout = arg_smtp_receive_timeout;
4560 /* If Exim was started with root privilege, unless we have already removed the
4561 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4562 except when starting the daemon or doing some kind of delivery or address
4563 testing (-bt). These are the only cases when root need to be retained. We run
4564 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4565 retained only for starting the daemon. We always do the initgroups() in this
4566 situation (controlled by the TRUE below), in order to be as close as possible
4567 to the state Exim usually runs in. */
4569 if ( !unprivileged /* originally had root AND */
4570 && !removed_privilege /* still got root AND */
4571 && !f.daemon_listen /* not starting the daemon */
4572 && queue_interval <= 0 /* (either kind of daemon) */
4573 && ( /* AND EITHER */
4574 deliver_drop_privilege /* requested unprivileged */
4576 queue_interval < 0 /* not running the queue */
4577 && ( msg_action_arg < 0 /* and */
4578 || msg_action != MSG_DELIVER /* not delivering */
4580 && (!checking || !f.address_test_mode) /* not address checking */
4581 && !rcpt_verify_quota /* and not quota checking */
4583 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4585 /* When we are retaining a privileged uid, we still change to the exim gid. */
4590 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4591 rv = setgid(exim_gid);
4592 /* Impact of failure is that some stuff might end up with an incorrect group.
4593 We track this for failures from root, since any attempt to change privilege
4594 by root should succeed and failures should be examined. For non-root,
4595 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4596 no need to complain then. */
4598 if (!(unprivileged || removed_privilege))
4599 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4602 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4603 (long int)exim_gid, strerror(errno));
4607 /* Handle a request to scan a file for malware */
4608 if (malware_test_file)
4610 #ifdef WITH_CONTENT_SCAN
4612 set_process_info("scanning file for malware");
4613 if ((result = malware_in_file(malware_test_file)) == FAIL)
4615 printf("No malware found.\n");
4620 printf("Malware lookup returned non-okay/fail: %d\n", result);
4624 printf("Malware found: %s\n", malware_name);
4626 printf("Malware scan detected malware of unknown name.\n");
4628 printf("Malware scanning not enabled at compile time.\n");
4633 /* Handle a request to list the delivery queue */
4637 set_process_info("listing the queue");
4638 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4642 /* Handle a request to count the delivery queue */
4646 set_process_info("counting the queue");
4647 fprintf(stdout, "%u\n", queue_count());
4651 /* Handle actions on specific messages, except for the force delivery and
4652 message load actions, which are done below. Some actions take a whole list of
4653 message ids, which are known to continue up to the end of the arguments. Others
4654 take a single message id and then operate on the recipients list. */
4656 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4658 int yield = EXIT_SUCCESS;
4659 set_process_info("acting on specified messages");
4661 /* ACL definitions may be needed when removing a message (-Mrm) because
4662 event_action gets expanded */
4664 if (msg_action == MSG_REMOVE)
4666 int old_pool = store_pool;
4667 store_pool = POOL_CONFIG;
4669 store_pool = old_pool;
4670 store_writeprotect(POOL_CONFIG);
4673 if (!one_msg_action)
4675 for (i = msg_action_arg; i < argc; i++)
4676 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4677 yield = EXIT_FAILURE;
4680 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4681 default: printf("\n"); break;
4685 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4686 recipients_arg)) yield = EXIT_FAILURE;
4690 /* We used to set up here to skip reading the ACL section, on
4691 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4692 Now, since the intro of the ${acl } expansion, ACL definitions may be
4693 needed in transports so we lost the optimisation. */
4696 int old_pool = store_pool;
4697 #ifdef MEASURE_TIMING
4699 (void)gettimeofday(&t0, NULL);
4702 store_pool = POOL_CONFIG;
4704 store_pool = old_pool;
4706 /* -be can add macro definitions, needing to link to the macro structure
4707 chain. Otherwise, make the memory used for config data readonly. */
4709 if (!expansion_test)
4710 store_writeprotect(POOL_CONFIG);
4712 #ifdef MEASURE_TIMING
4713 report_time_since(&t0, US"readconf_rest (delta)");
4717 /* Handle a request to check quota */
4718 if (rcpt_verify_quota)
4719 if (real_uid != root_uid && real_uid != exim_uid)
4720 exim_fail("exim: Permission denied\n");
4721 else if (recipients_arg >= argc)
4722 exim_fail("exim: missing recipient for quota check\n");
4725 verify_quota(argv[recipients_arg]);
4726 exim_exit(EXIT_SUCCESS);
4729 /* Handle the -brt option. This is for checking out retry configurations.
4730 The next three arguments are a domain name or a complete address, and
4731 optionally two error numbers. All it does is to call the function that
4732 scans the retry configuration data. */
4734 if (test_retry_arg >= 0)
4736 retry_config *yield;
4737 int basic_errno = 0;
4739 const uschar *s1, *s2;
4741 if (test_retry_arg >= argc)
4743 printf("-brt needs a domain or address argument\n");
4744 exim_exit(EXIT_FAILURE);
4746 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4749 /* If the first argument contains no @ and no . it might be a local user
4750 or it might be a single-component name. Treat as a domain. */
4752 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4754 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4755 "being \ntreated as a one-component domain, not as a local part.\n\n",
4759 /* There may be an optional second domain arg. */
4761 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4762 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4764 /* The final arg is an error name */
4766 if (test_retry_arg < argc)
4768 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4770 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4773 printf("%s\n", CS error);
4774 return EXIT_FAILURE;
4777 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4778 code > 100 as an error is for matching codes to the decade. Turn them into
4779 a real error code, off the decade. */
4781 if (basic_errno == ERRNO_MAIL4XX ||
4782 basic_errno == ERRNO_RCPT4XX ||
4783 basic_errno == ERRNO_DATA4XX)
4785 int code = (more_errno >> 8) & 255;
4787 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4788 else if (code > 100)
4789 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4793 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4794 printf("No retry information found\n");
4797 more_errno = yield->more_errno;
4798 printf("Retry rule: %s ", yield->pattern);
4800 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4802 printf("quota%s%s ",
4803 (more_errno > 0)? "_" : "",
4804 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4806 else if (yield->basic_errno == ECONNREFUSED)
4808 printf("refused%s%s ",
4809 (more_errno > 0)? "_" : "",
4810 (more_errno == 'M')? "MX" :
4811 (more_errno == 'A')? "A" : "");
4813 else if (yield->basic_errno == ETIMEDOUT)
4816 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4818 if (more_errno != 0) printf("_%s",
4819 (more_errno == 'M')? "MX" : "A");
4822 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4823 printf("auth_failed ");
4826 for (retry_rule * r = yield->rules; r; r = r->next)
4828 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4829 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4835 printf(",%d.", x/1000);
4849 exim_exit(EXIT_SUCCESS);
4852 /* Handle a request to list one or more configuration options */
4853 /* If -n was set, we suppress some information */
4858 set_process_info("listing variables");
4859 if (recipients_arg >= argc)
4860 fail = !readconf_print(US"all", NULL, flag_n);
4861 else for (i = recipients_arg; i < argc; i++)
4864 (Ustrcmp(argv[i], "router") == 0 ||
4865 Ustrcmp(argv[i], "transport") == 0 ||
4866 Ustrcmp(argv[i], "authenticator") == 0 ||
4867 Ustrcmp(argv[i], "macro") == 0 ||
4868 Ustrcmp(argv[i], "environment") == 0))
4870 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4874 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4876 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4881 set_process_info("listing config");
4882 exim_exit(readconf_print(US"config", NULL, flag_n)
4883 ? EXIT_SUCCESS : EXIT_FAILURE);
4887 /* Initialise subsystems as required. */
4891 /* Handle a request to deliver one or more messages that are already on the
4892 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4893 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4895 Delivery of specific messages is typically used for a small number when
4896 prodding by hand (when the option forced_delivery will be set) or when
4897 re-execing to regain root privilege. Each message delivery must happen in a
4898 separate process, so we fork a process for each one, and run them sequentially
4899 so that debugging output doesn't get intertwined, and to avoid spawning too
4900 many processes if a long list is given. However, don't fork for the last one;
4901 this saves a process in the common case when Exim is called to deliver just one
4904 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4906 if (prod_requires_admin && !f.admin_user)
4908 fprintf(stderr, "exim: Permission denied\n");
4909 exim_exit(EXIT_FAILURE);
4911 set_process_info("delivering specified messages");
4912 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4913 for (i = msg_action_arg; i < argc; i++)
4917 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4918 that runs into a later copy into the untainted global message_id[] */
4919 /*XXX Do we need a length limit check here? */
4921 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4922 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4924 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4925 exim_underbar_exit(EXIT_SUCCESS);
4929 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4931 exim_exit(EXIT_FAILURE);
4935 exim_exit(EXIT_SUCCESS);
4939 /* If only a single queue run is requested, without SMTP listening, we can just
4940 turn into a queue runner, with an optional starting message id. */
4942 if (queue_interval == 0 && !f.daemon_listen)
4944 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4945 start_queue_run_id ? US" starting at " : US"",
4946 start_queue_run_id ? start_queue_run_id: US"",
4947 stop_queue_run_id ? US" stopping at " : US"",
4948 stop_queue_run_id ? stop_queue_run_id : US"");
4950 set_process_info("running the '%s' queue (single queue run)", queue_name);
4952 set_process_info("running the queue (single queue run)");
4953 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4954 exim_exit(EXIT_SUCCESS);
4958 /* Find the login name of the real user running this process. This is always
4959 needed when receiving a message, because it is written into the spool file. It
4960 may also be used to construct a from: or a sender: header, and in this case we
4961 need the user's full name as well, so save a copy of it, checked for RFC822
4962 syntax and munged if necessary, if it hasn't previously been set by the -F
4963 argument. We may try to get the passwd entry more than once, in case NIS or
4964 other delays are in evidence. Save the home directory for use in filter testing
4969 if ((pw = getpwuid(real_uid)) != NULL)
4971 originator_login = string_copy(US pw->pw_name);
4972 originator_home = string_copy(US pw->pw_dir);
4974 /* If user name has not been set by -F, set it from the passwd entry
4975 unless -f has been used to set the sender address by a trusted user. */
4977 if (!originator_name)
4979 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4981 uschar *name = US pw->pw_gecos;
4982 uschar *amp = Ustrchr(name, '&');
4985 /* Most Unix specify that a '&' character in the gecos field is
4986 replaced by a copy of the login name, and some even specify that
4987 the first character should be upper cased, so that's what we do. */
4992 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4993 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4994 buffer[loffset] = toupper(buffer[loffset]);
4998 /* If a pattern for matching the gecos field was supplied, apply
4999 it and then expand the name string. */
5001 if (gecos_pattern && gecos_name)
5003 const pcre2_code *re;
5004 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5006 if (regex_match_and_setup(re, name, 0, -1))
5008 uschar *new_name = expand_string(gecos_name);
5012 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5013 "gecos field \"%s\"\n", new_name, name);
5016 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5017 "\"%s\": %s\n", gecos_name, expand_string_message);
5019 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5020 "gecos field \"%s\"\n", gecos_pattern, name);
5021 store_free((void *)re);
5023 originator_name = string_copy(name);
5026 /* A trusted caller has used -f but not -F */
5028 else originator_name = US"";
5031 /* Break the retry loop */
5036 if (++i > finduser_retries) break;
5040 /* If we cannot get a user login, log the incident and give up, unless the
5041 configuration specifies something to use. When running in the test harness,
5042 any setting of unknown_login overrides the actual name. */
5044 if (!originator_login || f.running_in_test_harness)
5048 originator_login = expand_string(unknown_login);
5049 if (!originator_name && unknown_username)
5050 originator_name = expand_string(unknown_username);
5051 if (!originator_name) originator_name = US"";
5053 if (!originator_login)
5054 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5058 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5061 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5063 /* If a message is created by this call of Exim, the uid/gid of its originator
5064 are those of the caller. These values are overridden if an existing message is
5065 read in from the spool. */
5067 originator_uid = real_uid;
5068 originator_gid = real_gid;
5070 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5071 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5073 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5074 returns. We leave this till here so that the originator_ fields are available
5075 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5078 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5082 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5083 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5084 "mua_wrapper is set");
5087 # ifndef DISABLE_TLS
5088 /* This also checks that the library linkage is working and we can call
5089 routines in it, so call even if tls_require_ciphers is unset */
5091 # ifdef MEASURE_TIMING
5093 (void)gettimeofday(&t0, NULL);
5095 if (!tls_dropprivs_validate_require_cipher(FALSE))
5097 # ifdef MEASURE_TIMING
5098 report_time_since(&t0, US"validate_ciphers (delta)");
5106 /* If the sender ident has not been set (by a trusted caller) set it to
5107 the caller. This will get overwritten below for an inetd call. If a trusted
5108 caller has set it empty, unset it. */
5110 if (!sender_ident) sender_ident = originator_login;
5111 else if (!*sender_ident) sender_ident = NULL;
5113 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5114 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5115 originator_* variables set. */
5117 if (test_rewrite_arg >= 0)
5119 f.really_exim = FALSE;
5120 if (test_rewrite_arg >= argc)
5122 printf("-brw needs an address argument\n");
5123 exim_exit(EXIT_FAILURE);
5125 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5126 exim_exit(EXIT_SUCCESS);
5129 /* A locally-supplied message is considered to be coming from a local user
5130 unless a trusted caller supplies a sender address with -f, or is passing in the
5131 message via SMTP (inetd invocation or otherwise). */
5133 if ( !sender_address && !smtp_input
5134 || !f.trusted_caller && filter_test == FTEST_NONE)
5136 f.sender_local = TRUE;
5138 /* A trusted caller can supply authenticated_sender and authenticated_id
5139 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5140 defaults except when host checking. */
5142 if (!authenticated_sender && !host_checking)
5143 authenticated_sender = string_sprintf("%s@%s", originator_login,
5144 qualify_domain_sender);
5145 if (!authenticated_id && !host_checking)
5146 authenticated_id = originator_login;
5149 /* Trusted callers are always permitted to specify the sender address.
5150 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5151 is specified is the empty address. However, if a trusted caller does not
5152 specify a sender address for SMTP input, we leave sender_address unset. This
5153 causes the MAIL commands to be honoured. */
5155 if ( !smtp_input && !sender_address
5156 || !receive_check_set_sender(sender_address))
5158 /* Either the caller is not permitted to set a general sender, or this is
5159 non-SMTP input and the trusted caller has not set a sender. If there is no
5160 sender, or if a sender other than <> is set, override with the originator's
5161 login (which will get qualified below), except when checking things. */
5163 if ( !sender_address /* No sender_address set */
5165 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5166 !checking)) /* Not running tests, including filter tests */
5168 sender_address = originator_login;
5169 f.sender_address_forced = FALSE;
5170 sender_address_domain = 0;
5174 /* Remember whether an untrusted caller set the sender address */
5176 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5178 /* Ensure that the sender address is fully qualified unless it is the empty
5179 address, which indicates an error message, or doesn't exist (root caller, smtp
5180 interface, no -f argument). */
5182 if (sender_address && *sender_address && sender_address_domain == 0)
5183 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5184 qualify_domain_sender);
5186 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5188 /* Handle a request to verify a list of addresses, or test them for delivery.
5189 This must follow the setting of the sender address, since routers can be
5190 predicated upon the sender. If no arguments are given, read addresses from
5191 stdin. Set debug_level to at least D_v to get full output for address testing.
5194 if (verify_address_mode || f.address_test_mode)
5197 int flags = vopt_qualify;
5199 if (verify_address_mode)
5201 if (!verify_as_sender) flags |= vopt_is_recipient;
5202 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5207 flags |= vopt_is_recipient;
5208 debug_selector |= D_v;
5209 debug_file = stderr;
5210 debug_fd = fileno(debug_file);
5211 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5214 if (recipients_arg < argc)
5215 while (recipients_arg < argc)
5217 /* Supplied addresses are tainted since they come from a user */
5218 uschar * s = string_copy_taint(
5219 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5223 BOOL finished = FALSE;
5224 uschar *ss = parse_find_address_end(s, FALSE);
5225 if (*ss == ',') *ss = 0; else finished = TRUE;
5226 test_address(s, flags, &exit_value);
5229 while (*++s == ',' || isspace(*s)) ;
5235 uschar * s = get_stdinput(NULL, NULL);
5237 test_address(string_copy_taint(
5238 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5240 flags, &exit_value);
5244 exim_exit(exit_value);
5247 /* Handle expansion checking. Either expand items on the command line, or read
5248 from stdin if there aren't any. If -Mset was specified, load the message so
5249 that its variables can be used, but restrict this facility to admin users.
5250 Otherwise, if -bem was used, read a message from stdin. */
5254 dns_init(FALSE, FALSE, FALSE);
5255 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5259 exim_fail("exim: permission denied\n");
5260 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5261 /* Checking the length of the ID is sufficient to validate it.
5262 Get an untainted version so file opens can be done. */
5263 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5265 spoolname = string_sprintf("%s-H", message_id);
5266 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5267 printf ("Failed to load message datafile %s\n", message_id);
5268 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5269 printf ("Failed to load message %s\n", message_id);
5272 /* Read a test message from a file. We fudge it up to be on stdin, saving
5273 stdin itself for later reading of expansion strings. */
5275 else if (expansion_test_message)
5277 int save_stdin = dup(0);
5278 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5280 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5283 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5284 message_ended = END_NOTENDED;
5285 read_message_body(receive_msg(extract_recipients));
5286 message_linecount += body_linecount;
5287 (void)dup2(save_stdin, 0);
5288 (void)close(save_stdin);
5289 clearerr(stdin); /* Required by Darwin */
5292 /* Only admin users may see config-file macros this way */
5294 if (!f.admin_user) macros_user = macros = mlast = NULL;
5296 /* Allow $recipients for this testing */
5298 f.enable_dollar_recipients = TRUE;
5300 /* Expand command line items */
5302 if (recipients_arg < argc)
5303 while (recipients_arg < argc)
5304 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5310 char *(*fn_readline)(const char *) = NULL;
5311 void (*fn_addhist)(const char *) = NULL;
5315 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5318 while (s = get_stdinput(fn_readline, fn_addhist))
5319 expansion_test_line(s);
5322 if (dlhandle) dlclose(dlhandle);
5326 /* The data file will be open after -Mset */
5328 if (deliver_datafile >= 0)
5330 (void)close(deliver_datafile);
5331 deliver_datafile = -1;
5334 exim_exit(EXIT_SUCCESS);
5338 /* The active host name is normally the primary host name, but it can be varied
5339 for hosts that want to play several parts at once. We need to ensure that it is
5340 set for host checking, and for receiving messages. */
5342 smtp_active_hostname = primary_hostname;
5343 if (raw_active_hostname != NULL)
5345 uschar *nah = expand_string(raw_active_hostname);
5348 if (!f.expand_string_forcedfail)
5349 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5350 "(smtp_active_hostname): %s", raw_active_hostname,
5351 expand_string_message);
5353 else if (nah[0] != 0) smtp_active_hostname = nah;
5356 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5357 given IP address so that the blocking and relay configuration can be tested.
5358 Unless a sender_ident was set by -oMt, we discard it (the default is the
5359 caller's login name). An RFC 1413 call is made only if we are running in the
5360 test harness and an incoming interface and both ports are specified, because
5361 there is no TCP/IP call to find the ident for. */
5368 if (!sender_ident_set)
5370 sender_ident = NULL;
5371 if (f.running_in_test_harness && sender_host_port
5372 && interface_address && interface_port)
5373 verify_get_ident(1223); /* note hardwired port number */
5376 /* In case the given address is a non-canonical IPv6 address, canonicalize
5377 it. The code works for both IPv4 and IPv6, as it happens. */
5379 size = host_aton(sender_host_address, x);
5380 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5381 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5383 /* Now set up for testing */
5385 host_build_sender_fullhost();
5389 f.sender_local = FALSE;
5390 f.sender_host_notsocket = TRUE;
5391 debug_file = stderr;
5392 debug_fd = fileno(debug_file);
5393 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5394 "**** but without any ident (RFC 1413) callback.\n"
5395 "**** This is not for real!\n\n",
5396 sender_host_address);
5398 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5399 if (verify_check_host(&hosts_connection_nolog) == OK)
5401 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5402 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5404 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5406 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5407 because a log line has already been written for all its failure exists
5408 (usually "connection refused: <reason>") and writing another one is
5409 unnecessary clutter. */
5411 if (smtp_start_session())
5414 for (; (reset_point = store_mark()); store_reset(reset_point))
5416 if (smtp_setup_msg() <= 0) break;
5417 if (!receive_msg(FALSE)) break;
5419 return_path = sender_address = NULL;
5420 dnslist_domain = dnslist_matched = NULL;
5421 #ifndef DISABLE_DKIM
5422 dkim_cur_signer = NULL;
5425 deliver_localpart_orig = NULL;
5426 deliver_domain_orig = NULL;
5427 callout_address = sending_ip_address = NULL;
5428 deliver_localpart_data = deliver_domain_data =
5429 recipient_data = sender_data = NULL;
5430 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5434 exim_exit(EXIT_SUCCESS);
5438 /* Arrange for message reception if recipients or SMTP were specified;
5439 otherwise complain unless a version print (-bV) happened or this is a filter
5440 verification test or info dump.
5441 In the former case, show the configuration file name. */
5443 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5445 if (version_printed)
5447 if (Ustrchr(config_main_filelist, ':'))
5448 printf("Configuration file search path is %s\n", config_main_filelist);
5449 printf("Configuration file is %s\n", config_main_filename);
5450 return EXIT_SUCCESS;
5453 if (info_flag != CMDINFO_NONE)
5455 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5456 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5459 if (filter_test == FTEST_NONE)
5460 exim_usage(called_as);
5464 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5465 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5466 that we are not called from inetd, because that is rejected above. The
5467 following configuration settings are forced here:
5469 (1) Synchronous delivery (-odi)
5470 (2) Errors to stderr (-oep == -oeq)
5471 (3) No parallel remote delivery
5472 (4) Unprivileged delivery
5474 We don't force overall queueing options because there are several of them;
5475 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5476 to override any SMTP queueing. */
5480 f.synchronous_delivery = TRUE;
5481 arg_error_handling = ERRORS_STDERR;
5482 remote_max_parallel = 1;
5483 deliver_drop_privilege = TRUE;
5484 f.queue_smtp = FALSE;
5485 queue_smtp_domains = NULL;
5487 message_utf8_downconvert = -1; /* convert-if-needed */
5492 /* Prepare to accept one or more new messages on the standard input. When a
5493 message has been read, its id is returned in message_id[]. If doing immediate
5494 delivery, we fork a delivery process for each received message, except for the
5495 last one, where we can save a process switch.
5497 It is only in non-smtp mode that error_handling is allowed to be changed from
5498 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5499 sendmail error modes other than -oem ever actually used? Later: yes.) */
5501 if (!smtp_input) error_handling = arg_error_handling;
5503 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5504 logging being sent down the socket and make an identd call to get the
5507 else if (f.is_inetd)
5509 (void)fclose(stderr);
5510 exim_nullstd(); /* Re-open to /dev/null */
5511 verify_get_ident(IDENT_PORT);
5512 host_build_sender_fullhost();
5513 set_process_info("handling incoming connection from %s via inetd",
5517 /* If the sender host address has been set, build sender_fullhost if it hasn't
5518 already been done (which it will have been for inetd). This caters for the
5519 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5520 so that the test for IP options is skipped for -bs input. */
5522 if (sender_host_address && !sender_fullhost)
5524 host_build_sender_fullhost();
5525 set_process_info("handling incoming connection from %s via -oMa",
5527 f.sender_host_notsocket = TRUE;
5530 /* Otherwise, set the sender host as unknown except for inetd calls. This
5531 prevents host checking in the case of -bs not from inetd and also for -bS. */
5533 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5535 /* If stdout does not exist, then dup stdin to stdout. This can happen
5536 if exim is started from inetd. In this case fd 0 will be set to the socket,
5537 but fd 1 will not be set. This also happens for passed SMTP channels. */
5539 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5541 /* Set up the incoming protocol name and the state of the program. Root is
5542 allowed to force received protocol via the -oMr option above. If we have come
5543 via inetd, the process info has already been set up. We don't set
5544 received_protocol here for smtp input, as it varies according to
5545 batch/HELO/EHLO/AUTH/TLS. */
5549 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5550 smtp_batched_input? "batched " : "",
5551 sender_address ? sender_address : originator_login);
5555 int old_pool = store_pool;
5556 store_pool = POOL_PERM;
5557 if (!received_protocol)
5558 received_protocol = string_sprintf("local%s", called_as);
5559 store_pool = old_pool;
5560 set_process_info("accepting a local non-SMTP message from <%s>",
5564 /* Initialize the session_local_queue-only flag (this will be ignored if
5565 mua_wrapper is set) */
5568 session_local_queue_only = queue_only;
5570 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5571 the spool if so configured. On failure, we must not attempt to send an error
5572 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5573 error code is given.) */
5575 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5576 exim_fail("exim: insufficient disk space\n");
5578 /* If this is smtp input of any kind, real or batched, handle the start of the
5581 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5582 because a log line has already been written for all its failure exists
5583 (usually "connection refused: <reason>") and writing another one is
5584 unnecessary clutter. */
5590 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5591 if (verify_check_host(&hosts_connection_nolog) == OK)
5593 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5594 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5596 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5597 if (!smtp_start_session())
5600 exim_exit(EXIT_SUCCESS);
5604 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5605 (we handle buferring so as to have visibility of fill level). */
5609 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5610 if (expand_string_message)
5611 if (thismessage_size_limit == -1)
5612 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5613 "message_size_limit: %s", expand_string_message);
5615 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5616 "message_size_limit: %s", expand_string_message);
5618 setvbuf(stdin, NULL, _IONBF, 0);
5621 /* Loop for several messages when reading SMTP input. If we fork any child
5622 processes, we don't want to wait for them unless synchronous delivery is
5623 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5624 same as SIG_DFL, despite the fact that documentation often lists the default as
5625 "ignore". This is a confusing area. This is what I know:
5627 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5628 processes that complete simply to go away without ever becoming defunct. You
5629 can't then wait for them - but we don't want to wait for them in the
5630 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5631 happen for all OS (e.g. *BSD is different).
5633 But that's not the end of the story. Some (many? all?) systems have the
5634 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5635 has by default, so it seems that the difference is merely one of default
5636 (compare restarting vs non-restarting signals).
5638 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5639 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5640 of the loop below. Paranoia rules.
5642 February 2003: That's *still* not the end of the story. There are now versions
5643 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5644 process then calls waitpid(), a grumble is written to the system log, because
5645 this is logically inconsistent. In other words, it doesn't like the paranoia.
5646 As a consequence of this, the waitpid() below is now excluded if we are sure
5647 that SIG_IGN works. */
5649 if (!f.synchronous_delivery)
5652 struct sigaction act;
5653 act.sa_handler = SIG_IGN;
5654 sigemptyset(&(act.sa_mask));
5655 act.sa_flags = SA_NOCLDWAIT;
5656 sigaction(SIGCHLD, &act, NULL);
5658 signal(SIGCHLD, SIG_IGN);
5662 /* Save the current store pool point, for resetting at the start of
5663 each message, and save the real sender address, if any. */
5665 real_sender_address = sender_address;
5667 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5668 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5671 for (BOOL more = TRUE; more; )
5673 rmark reset_point = store_mark();
5676 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5677 input and build the recipients list, before calling receive_msg() to read the
5678 message proper. Whatever sender address is given in the SMTP transaction is
5679 often ignored for local senders - we use the actual sender, which is normally
5680 either the underlying user running this process or a -f argument provided by
5681 a trusted caller. It is saved in real_sender_address. The test for whether to
5682 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5687 if ((rc = smtp_setup_msg()) > 0)
5689 if (real_sender_address != NULL &&
5690 !receive_check_set_sender(sender_address))
5692 sender_address = raw_sender = real_sender_address;
5693 sender_address_unrewritten = NULL;
5696 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5697 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5698 the very end. The result of the ACL is ignored (as for other non-SMTP
5699 messages). It is run for its potential side effects. */
5701 if (smtp_batched_input && acl_not_smtp_start != NULL)
5703 uschar *user_msg, *log_msg;
5704 f.enable_dollar_recipients = TRUE;
5705 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5706 &user_msg, &log_msg);
5707 f.enable_dollar_recipients = FALSE;
5710 /* Now get the data for the message */
5712 more = receive_msg(extract_recipients);
5715 cancel_cutthrough_connection(TRUE, US"receive dropped");
5716 if (more) goto MORELOOP;
5717 smtp_log_no_mail(); /* Log no mail if configured */
5718 exim_exit(EXIT_FAILURE);
5723 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5724 smtp_log_no_mail(); /* Log no mail if configured */
5725 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5729 /* In the non-SMTP case, we have all the information from the command
5730 line, but must process it in case it is in the more general RFC822
5731 format, and in any case, to detect syntax errors. Also, it appears that
5732 the use of comma-separated lists as single arguments is common, so we
5733 had better support them. */
5738 int count = argc - recipients_arg;
5739 uschar **list = argv + recipients_arg;
5741 /* These options cannot be changed dynamically for non-SMTP messages */
5743 f.active_local_sender_retain = local_sender_retain;
5744 f.active_local_from_check = local_from_check;
5746 /* Save before any rewriting */
5748 raw_sender = string_copy(sender_address);
5750 /* Loop for each argument (supplied by user hence tainted) */
5752 for (int i = 0; i < count; i++)
5754 int start, end, domain;
5756 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5757 * We'll still want to cap it to something, just in case. */
5758 uschar * s = string_copy_taint(
5759 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5762 /* Loop for each comma-separated address */
5766 BOOL finished = FALSE;
5768 uschar *ss = parse_find_address_end(s, FALSE);
5770 if (*ss == ',') *ss = 0; else finished = TRUE;
5772 /* Check max recipients - if -t was used, these aren't recipients */
5774 if (recipients_max > 0 && ++rcount > recipients_max &&
5775 !extract_recipients)
5776 if (error_handling == ERRORS_STDERR)
5778 fprintf(stderr, "exim: too many recipients\n");
5779 exim_exit(EXIT_FAILURE);
5783 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5784 errors_sender_rc : EXIT_FAILURE;
5788 BOOL b = allow_utf8_domains;
5789 allow_utf8_domains = TRUE;
5792 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5796 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5797 else allow_utf8_domains = b;
5802 if (domain == 0 && !f.allow_unqualified_recipient)
5805 errmess = US"unqualified recipient address not allowed";
5809 if (error_handling == ERRORS_STDERR)
5811 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5812 string_printing(list[i]), errmess);
5813 exim_exit(EXIT_FAILURE);
5819 eblock.text1 = string_printing(list[i]);
5820 eblock.text2 = errmess;
5822 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5823 errors_sender_rc : EXIT_FAILURE;
5826 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5829 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5833 /* Show the recipients when debugging */
5837 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5838 if (recipients_list)
5840 debug_printf("Recipients:\n");
5841 for (int i = 0; i < recipients_count; i++)
5842 debug_printf(" %s\n", recipients_list[i].address);
5846 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5847 ignored; rejecting here would just add complication, and it can just as
5848 well be done later. Allow $recipients to be visible in the ACL. */
5850 if (acl_not_smtp_start)
5852 uschar *user_msg, *log_msg;
5853 f.enable_dollar_recipients = TRUE;
5854 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5855 &user_msg, &log_msg);
5856 f.enable_dollar_recipients = FALSE;
5859 /* Pause for a while waiting for input. If none received in that time,
5860 close the logfile, if we had one open; then if we wait for a long-running
5861 datasource (months, in one use-case) log rotation will not leave us holding
5864 if (!receive_timeout)
5865 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5868 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5869 will just read the headers for the message, and not write anything onto the
5872 message_ended = END_NOTENDED;
5873 more = receive_msg(extract_recipients);
5875 /* more is always FALSE here (not SMTP message) when reading a message
5876 for real; when reading the headers of a message for filter testing,
5877 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5879 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5880 } /* Non-SMTP message reception */
5882 /* If this is a filter testing run, there are headers in store, but
5883 no message on the spool. Run the filtering code in testing mode, setting
5884 the domain to the qualify domain and the local part to the current user,
5885 unless they have been set by options. The prefix and suffix are left unset
5886 unless specified. The the return path is set to to the sender unless it has
5887 already been set from a return-path header in the message. */
5889 if (filter_test != FTEST_NONE)
5891 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5892 deliver_domain_orig = deliver_domain;
5893 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5894 deliver_localpart_orig = deliver_localpart;
5895 deliver_localpart_prefix = US ftest_prefix;
5896 deliver_localpart_suffix = US ftest_suffix;
5897 deliver_home = originator_home;
5901 printf("Return-path copied from sender\n");
5902 return_path = string_copy(sender_address);
5905 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5906 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5908 receive_add_recipient(
5909 string_sprintf("%s%s%s@%s",
5910 ftest_prefix ? ftest_prefix : US"",
5912 ftest_suffix ? ftest_suffix : US"",
5913 deliver_domain), -1);
5915 printf("Recipient = %s\n", recipients_list[0].address);
5916 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5917 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5919 if (chdir("/")) /* Get away from wherever the user is running this from */
5921 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5922 exim_exit(EXIT_FAILURE);
5925 /* Now we run either a system filter test, or a user filter test, or both.
5926 In the latter case, headers added by the system filter will persist and be
5927 available to the user filter. We need to copy the filter variables
5930 if (filter_test & FTEST_SYSTEM)
5931 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5932 exim_exit(EXIT_FAILURE);
5934 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5936 if (filter_test & FTEST_USER)
5937 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5938 exim_exit(EXIT_FAILURE);
5940 exim_exit(EXIT_SUCCESS);
5943 /* Else act on the result of message reception. We should not get here unless
5944 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5945 will be TRUE. If it is not, check on the number of messages received in this
5948 if ( !session_local_queue_only
5949 && smtp_accept_queue_per_connection > 0
5950 && receive_messagecount > smtp_accept_queue_per_connection)
5952 session_local_queue_only = TRUE;
5953 queue_only_reason = 2;
5956 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5957 and queue_only_load is set, check that the load average is below it. If it is
5958 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5959 default), we put the whole session into queue_only mode. It then remains this
5960 way for any subsequent messages on the same SMTP connection. This is a
5961 deliberate choice; even though the load average may fall, it doesn't seem
5962 right to deliver later messages on the same call when not delivering earlier
5963 ones. However, there are odd cases where this is not wanted, so this can be
5964 changed by setting queue_only_load_latch false. */
5966 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5967 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5969 queue_only_reason = 3;
5970 if (queue_only_load_latch) session_local_queue_only = TRUE;
5973 /* If running as an MUA wrapper, all queueing options and freezing options
5977 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5979 /* Log the queueing here, when it will get a message id attached, but
5980 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5983 if (local_queue_only)
5985 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5986 switch(queue_only_reason)
5989 log_write(L_delay_delivery,
5990 LOG_MAIN, "no immediate delivery: more than %d messages "
5991 "received in one connection", smtp_accept_queue_per_connection);
5995 log_write(L_delay_delivery,
5996 LOG_MAIN, "no immediate delivery: load average %.2f",
5997 (double)load_average/1000.0);
6002 else if (f.queue_only_policy || f.deliver_freeze)
6003 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6005 /* Else do the delivery unless the ACL or local_scan() called for queue only
6006 or froze the message. Always deliver in a separate process. A fork failure is
6007 not a disaster, as the delivery will eventually happen on a subsequent queue
6008 run. The search cache must be tidied before the fork, as the parent will
6009 do it before exiting. The child will trigger a lookup failure and
6010 thereby defer the delivery if it tries to use (for example) a cached ldap
6011 connection that the parent has called unbind on. */
6018 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6021 close_unwanted(); /* Close unwanted file descriptors and TLS */
6022 exim_nullstd(); /* Ensure std{in,out,err} exist */
6024 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6025 mode, deliver_drop_privilege is forced TRUE). */
6027 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6029 delivery_re_exec(CEE_EXEC_EXIT);
6030 /* Control does not return here. */
6033 /* No need to re-exec */
6035 rc = deliver_message(message_id, FALSE, FALSE);
6037 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6038 ? EXIT_SUCCESS : EXIT_FAILURE);
6043 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6044 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6045 "process: %s", strerror(errno));
6049 release_cutthrough_connection(US"msg passed for delivery");
6051 /* In the parent, wait if synchronous delivery is required. This will
6052 always be the case in MUA wrapper mode. */
6054 if (f.synchronous_delivery)
6057 while (wait(&status) != pid);
6058 if ((status & 0x00ff) != 0)
6059 log_write(0, LOG_MAIN|LOG_PANIC,
6060 "process %d crashed with signal %d while delivering %s",
6061 (int)pid, status & 0x00ff, message_id);
6062 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6067 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6068 automatically reaps children (see comments above the loop), clear away any
6069 finished subprocesses here, in case there are lots of messages coming in
6070 from the same source. */
6072 #ifndef SIG_IGN_WORKS
6073 while (waitpid(-1, NULL, WNOHANG) > 0);
6077 return_path = sender_address = NULL;
6078 authenticated_sender = NULL;
6079 deliver_localpart_orig = NULL;
6080 deliver_domain_orig = NULL;
6081 deliver_host = deliver_host_address = NULL;
6082 dnslist_domain = dnslist_matched = NULL;
6083 #ifdef WITH_CONTENT_SCAN
6084 malware_name = NULL;
6087 callout_address = NULL;
6088 sending_ip_address = NULL;
6089 deliver_localpart_data = deliver_domain_data =
6090 recipient_data = sender_data = NULL;
6093 store_reset(reset_point);
6096 exim_exit(EXIT_SUCCESS); /* Never returns */
6097 return 0; /* To stop compiler warning */