1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 */
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>
21 # include <gnutls/gnutls.h>
22 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
31 extern void init_lookup_list(void);
35 /*************************************************
36 * Function interface to store functions *
37 *************************************************/
39 /* We need some real functions to pass to the PCRE regular expression library
40 for store allocation via Exim's store manager. The normal calls are actually
41 macros that pass over location information to make tracing easier. These
42 functions just interface to the standard macro calls. A good compiler will
43 optimize out the tail recursion and so not make them too expensive. There
44 are two sets of functions; one for use when we want to retain the compiled
45 regular expression for a long time; the other for short-term use. */
48 function_store_get(size_t size)
50 /* For now, regard all RE results as potentially tainted. We might need
51 more intelligence on this point. */
52 return store_get((int)size, TRUE);
56 function_dummy_free(void * block) {}
59 function_store_malloc(size_t size)
61 return store_malloc((int)size);
65 function_store_free(void * block)
73 /*************************************************
74 * Enums for cmdline interface *
75 *************************************************/
77 enum commandline_info { CMDINFO_NONE=0,
78 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
83 /*************************************************
84 * Compile regular expression and panic on fail *
85 *************************************************/
87 /* This function is called when failure to compile a regular expression leads
88 to a panic exit. In other cases, pcre_compile() is called directly. In many
89 cases where this function is used, the results of the compilation are to be
90 placed in long-lived store, so we temporarily reset the store management
91 functions that PCRE uses if the use_malloc flag is set.
94 pattern the pattern to compile
95 caseless TRUE if caseless matching is required
96 use_malloc TRUE if compile into malloc store
98 Returns: pointer to the compiled pattern
102 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
105 int options = PCRE_COPT;
110 pcre_malloc = function_store_malloc;
111 pcre_free = function_store_free;
113 if (caseless) options |= PCRE_CASELESS;
114 yield = pcre_compile(CCS pattern, options, CCSS &error, &offset, NULL);
115 pcre_malloc = function_store_get;
116 pcre_free = function_dummy_free;
118 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
119 "%s at offset %d while compiling %s", error, offset, pattern);
126 /*************************************************
127 * Execute regular expression and set strings *
128 *************************************************/
130 /* This function runs a regular expression match, and sets up the pointers to
131 the matched substrings.
134 re the compiled expression
135 subject the subject string
136 options additional PCRE options
137 setup if < 0 do full setup
138 if >= 0 setup from setup+1 onwards,
139 excluding the full matched string
141 Returns: TRUE or FALSE
145 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
147 int ovector[3*(EXPAND_MAXN+1)];
148 uschar * s = string_copy(subject); /* de-constifying */
149 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
150 PCRE_EOPT | options, ovector, nelem(ovector));
152 if (n == 0) n = EXPAND_MAXN + 1;
155 expand_nmax = setup < 0 ? 0 : setup + 1;
156 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
158 expand_nstring[expand_nmax] = s + ovector[nn];
159 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
169 /*************************************************
170 * Set up processing details *
171 *************************************************/
173 /* Save a text string for dumping when SIGUSR1 is received.
174 Do checks for overruns.
176 Arguments: format and arguments, as for printf()
181 set_process_info(const char *format, ...)
183 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
188 g = string_fmt_append(&gs, "%5d ", (int)getpid());
190 va_start(ap, format);
191 if (!string_vformat(g, 0, format, ap))
194 g = string_cat(&gs, US"**** string overflowed buffer ****");
196 g = string_catn(g, US"\n", 1);
197 string_from_gstring(g);
198 process_info_len = g->ptr;
199 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
203 /***********************************************
204 * Handler for SIGTERM *
205 ***********************************************/
208 term_handler(int sig)
214 /***********************************************
215 * Handler for SIGSEGV *
216 ***********************************************/
219 segv_handler(int sig)
221 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
222 signal(SIGSEGV, SIG_DFL);
227 /*************************************************
228 * Handler for SIGUSR1 *
229 *************************************************/
231 /* SIGUSR1 causes any exim process to write to the process log details of
232 what it is currently doing. It will only be used if the OS is capable of
233 setting up a handler that causes automatic restarting of any system call
234 that is in progress at the time.
236 This function takes care to be signal-safe.
238 Argument: the signal number (SIGUSR1)
243 usr1_handler(int sig)
247 os_restarting_signal(sig, usr1_handler);
249 if (!process_log_path) return;
250 fd = log_open_as_exim(process_log_path);
252 /* If we are neither exim nor root, or if we failed to create the log file,
253 give up. There is not much useful we can do with errors, since we don't want
254 to disrupt whatever is going on outside the signal handler. */
258 (void)write(fd, process_info, process_info_len);
264 /*************************************************
266 *************************************************/
268 /* This handler is enabled most of the time that Exim is running. The handler
269 doesn't actually get used unless alarm() has been called to set a timer, to
270 place a time limit on a system call of some kind. When the handler is run, it
273 There are some other SIGALRM handlers that are used in special cases when more
274 than just a flag setting is required; for example, when reading a message's
275 input. These are normally set up in the code module that uses them, and the
276 SIGALRM handler is reset to this one afterwards.
278 Argument: the signal value (SIGALRM)
283 sigalrm_handler(int sig)
286 os_non_restarting_signal(SIGALRM, sigalrm_handler);
291 /*************************************************
292 * Sleep for a fractional time interval *
293 *************************************************/
295 /* This function is called by millisleep() and exim_wait_tick() to wait for a
296 period of time that may include a fraction of a second. The coding is somewhat
297 tedious. We do not expect setitimer() ever to fail, but if it does, the process
298 will wait for ever, so we panic in this instance. (There was a case of this
299 when a bug in a function that calls milliwait() caused it to pass invalid data.
300 That's when I added the check. :-)
302 We assume it to be not worth sleeping for under 50us; this value will
303 require revisiting as hardware advances. This avoids the issue of
304 a zero-valued timer setting meaning "never fire".
306 Argument: an itimerval structure containing the interval
311 milliwait(struct itimerval *itval)
314 sigset_t old_sigmask;
315 int save_errno = errno;
317 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
319 (void)sigemptyset(&sigmask); /* Empty mask */
320 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
321 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
322 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
323 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
324 "setitimer() failed: %s", strerror(errno));
325 (void)sigfillset(&sigmask); /* All signals */
326 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
327 (void)sigsuspend(&sigmask); /* Until SIGALRM */
328 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
330 sigalrm_seen = FALSE;
336 /*************************************************
337 * Millisecond sleep function *
338 *************************************************/
340 /* The basic sleep() function has a granularity of 1 second, which is too rough
341 in some cases - for example, when using an increasing delay to slow down
344 Argument: number of millseconds
351 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
352 .it_value = {.tv_sec = msec/1000,
353 .tv_usec = (msec % 1000) * 1000}};
359 /*************************************************
360 * Compare microsecond times *
361 *************************************************/
368 Returns: -1, 0, or +1
372 exim_tvcmp(struct timeval *t1, struct timeval *t2)
374 if (t1->tv_sec > t2->tv_sec) return +1;
375 if (t1->tv_sec < t2->tv_sec) return -1;
376 if (t1->tv_usec > t2->tv_usec) return +1;
377 if (t1->tv_usec < t2->tv_usec) return -1;
384 /*************************************************
385 * Clock tick wait function *
386 *************************************************/
388 #ifdef _POSIX_MONOTONIC_CLOCK
389 # ifdef CLOCK_BOOTTIME
390 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
392 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
395 /* Amount EXIM_CLOCK is behind realtime, at startup. */
396 static struct timespec offset_ts;
399 exim_clock_init(void)
402 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
403 (void)gettimeofday(&tv, NULL);
404 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
405 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
406 if (offset_ts.tv_nsec >= 0) return;
408 offset_ts.tv_nsec += 1000*1000*1000;
414 exim_gettime(struct timeval * tv)
416 #ifdef _POSIX_MONOTONIC_CLOCK
417 struct timespec now_ts;
419 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
421 now_ts.tv_sec += offset_ts.tv_sec;
422 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
425 now_ts.tv_nsec -= 1000*1000*1000;
427 tv->tv_sec = now_ts.tv_sec;
428 tv->tv_usec = now_ts.tv_nsec / 1000;
432 (void)gettimeofday(tv, NULL);
436 /* Exim uses a time + a pid to generate a unique identifier in two places: its
437 message IDs, and in file names for maildir deliveries. Because some OS now
438 re-use pids within the same second, sub-second times are now being used.
439 However, for absolute certainty, we must ensure the clock has ticked before
440 allowing the relevant process to complete. At the time of implementation of
441 this code (February 2003), the speed of processors is such that the clock will
442 invariably have ticked already by the time a process has done its job. This
443 function prepares for the time when things are faster - and it also copes with
444 clocks that go backwards.
447 tgt_tv A timeval which was used to create uniqueness; its usec field
448 has been rounded down to the value of the resolution.
449 We want to be sure the current time is greater than this.
450 resolution The resolution that was used to divide the microseconds
451 (1 for maildir, larger for message ids)
457 exim_wait_tick(struct timeval * tgt_tv, int resolution)
459 struct timeval now_tv;
460 long int now_true_usec;
462 exim_gettime(&now_tv);
463 now_true_usec = now_tv.tv_usec;
464 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
466 while (exim_tvcmp(&now_tv, tgt_tv) <= 0)
468 struct itimerval itval;
469 itval.it_interval.tv_sec = 0;
470 itval.it_interval.tv_usec = 0;
471 itval.it_value.tv_sec = tgt_tv->tv_sec - now_tv.tv_sec;
472 itval.it_value.tv_usec = tgt_tv->tv_usec + resolution - now_true_usec;
474 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
475 negative value for the microseconds is possible only in the case when "now"
476 is more than a second less than "tgt". That means that itval.it_value.tv_sec
477 is greater than zero. The following correction is therefore safe. */
479 if (itval.it_value.tv_usec < 0)
481 itval.it_value.tv_usec += 1000000;
482 itval.it_value.tv_sec -= 1;
485 DEBUG(D_transport|D_receive)
487 if (!f.running_in_test_harness)
489 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
490 tgt_tv->tv_sec, (long) tgt_tv->tv_usec,
491 now_tv.tv_sec, (long) now_tv.tv_usec);
492 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
493 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
499 /* Be prapared to go around if the kernel does not implement subtick
500 granularity (GNU Hurd) */
502 exim_gettime(&now_tv);
503 now_true_usec = now_tv.tv_usec;
504 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
511 /*************************************************
512 * Call fopen() with umask 777 and adjust mode *
513 *************************************************/
515 /* Exim runs with umask(0) so that files created with open() have the mode that
516 is specified in the open() call. However, there are some files, typically in
517 the spool directory, that are created with fopen(). They end up world-writeable
518 if no precautions are taken. Although the spool directory is not accessible to
519 the world, this is an untidiness. So this is a wrapper function for fopen()
520 that sorts out the mode of the created file.
523 filename the file name
524 options the fopen() options
525 mode the required mode
527 Returns: the fopened FILE or NULL
531 modefopen(const uschar *filename, const char *options, mode_t mode)
533 mode_t saved_umask = umask(0777);
534 FILE *f = Ufopen(filename, options);
535 (void)umask(saved_umask);
536 if (f != NULL) (void)fchmod(fileno(f), mode);
541 /*************************************************
542 * Ensure stdin, stdout, and stderr exist *
543 *************************************************/
545 /* Some operating systems grumble if an exec() happens without a standard
546 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
547 file will be opened and will use these fd values, and then some other bit of
548 code will assume, for example, that it can write error messages to stderr.
549 This function ensures that fds 0, 1, and 2 are open if they do not already
550 exist, by connecting them to /dev/null.
552 This function is also used to ensure that std{in,out,err} exist at all times,
553 so that if any library that Exim calls tries to use them, it doesn't crash.
564 for (int i = 0; i <= 2; i++)
566 if (fstat(i, &statbuf) < 0 && errno == EBADF)
568 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
569 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
570 string_open_failed("/dev/null", NULL));
571 if (devnull != i) (void)dup2(devnull, i);
574 if (devnull > 2) (void)close(devnull);
580 /*************************************************
581 * Close unwanted file descriptors for delivery *
582 *************************************************/
584 /* This function is called from a new process that has been forked to deliver
585 an incoming message, either directly, or using exec.
587 We want any smtp input streams to be closed in this new process. However, it
588 has been observed that using fclose() here causes trouble. When reading in -bS
589 input, duplicate copies of messages have been seen. The files will be sharing a
590 file pointer with the parent process, and it seems that fclose() (at least on
591 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
592 least sometimes. Hence we go for closing the underlying file descriptors.
594 If TLS is active, we want to shut down the TLS library, but without molesting
595 the parent's SSL connection.
597 For delivery of a non-SMTP message, we want to close stdin and stdout (and
598 stderr unless debugging) because the calling process might have set them up as
599 pipes and be waiting for them to close before it waits for the submission
600 process to terminate. If they aren't closed, they hold up the calling process
601 until the initial delivery process finishes, which is not what we want.
603 Exception: We do want it for synchronous delivery!
605 And notwithstanding all the above, if D_resolver is set, implying resolver
606 debugging, leave stdout open, because that's where the resolver writes its
609 When we close stderr (which implies we've also closed stdout), we also get rid
610 of any controlling terminal.
622 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
624 (void)close(fileno(smtp_in));
625 (void)close(fileno(smtp_out));
630 (void)close(0); /* stdin */
631 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
632 if (debug_selector == 0) /* stderr */
634 if (!f.synchronous_delivery)
647 /*************************************************
649 *************************************************/
651 /* This function sets a new uid and gid permanently, optionally calling
652 initgroups() to set auxiliary groups. There are some special cases when running
653 Exim in unprivileged modes. In these situations the effective uid will not be
654 root; if we already have the right effective uid/gid, and don't need to
655 initialize any groups, leave things as they are.
660 igflag TRUE if initgroups() wanted
661 msg text to use in debugging output and failure log
663 Returns: nothing; bombs out on failure
667 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
669 uid_t euid = geteuid();
670 gid_t egid = getegid();
672 if (euid == root_uid || euid != uid || egid != gid || igflag)
674 /* At least one OS returns +1 for initgroups failure, so just check for
679 struct passwd *pw = getpwuid(uid);
681 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
682 "no passwd entry for uid=%ld", (long int)uid);
684 if (initgroups(pw->pw_name, gid) != 0)
685 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
686 (long int)uid, strerror(errno));
689 if (setgid(gid) < 0 || setuid(uid) < 0)
690 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
691 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
694 /* Debugging output included uid/gid and all groups */
698 int group_count, save_errno;
699 gid_t group_list[EXIM_GROUPLIST_SIZE];
700 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
701 (long int)geteuid(), (long int)getegid(), (long int)getpid());
702 group_count = getgroups(nelem(group_list), group_list);
704 debug_printf(" auxiliary group list:");
706 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
707 else if (group_count < 0)
708 debug_printf(" <error: %s>", strerror(save_errno));
709 else debug_printf(" <none>");
717 /*************************************************
719 *************************************************/
721 /* Exim exits via this function so that it always clears up any open
727 Returns: does not return
736 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
737 ">>>>>>>>>>>>>>>>\n",
738 (int)getpid(), process_purpose, rc);
744 exim_underbar_exit(int rc)
748 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
749 ">>>>>>>>>>>>>>>>\n",
750 (int)getpid(), process_purpose, rc);
756 /* Print error string, then die */
758 exim_fail(const char * fmt, ...)
762 vfprintf(stderr, fmt, ap);
766 /* fail if a length is too long */
768 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
770 if (itemlen <= maxlen)
772 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
773 itemlen, maxlen, description);
777 /* only pass through the string item back to the caller if it's short enough */
778 static inline const uschar *
779 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
781 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
785 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
786 of chown()/fchown(). See src/functions.h for more explanation */
788 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
790 int saved_errno = errno; /* from the preceeding chown call */
792 log_write(0, LOG_MAIN|LOG_PANIC,
793 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
794 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
795 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
797 /* I leave this here, commented, in case the "bug"(?) comes up again.
798 It is not an Exim bug, but we can provide a workaround.
804 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
806 if (buf.st_uid == owner && buf.st_gid == group) return 0;
807 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
809 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
817 /*************************************************
818 * Extract port from host address *
819 *************************************************/
821 /* Called to extract the port from the values given to -oMa and -oMi.
822 It also checks the syntax of the address, and terminates it before the
823 port data when a port is extracted.
826 address the address, with possible port on the end
828 Returns: the port, or zero if there isn't one
829 bombs out on a syntax error
833 check_port(uschar *address)
835 int port = host_address_extract_port(address);
836 if (string_is_ip_address(address, NULL) == 0)
837 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
843 /*************************************************
844 * Test/verify an address *
845 *************************************************/
847 /* This function is called by the -bv and -bt code. It extracts a working
848 address from a full RFC 822 address. This isn't really necessary per se, but it
849 has the effect of collapsing source routes.
853 flags flag bits for verify_address()
854 exit_value to be set for failures
860 test_address(uschar *s, int flags, int *exit_value)
862 int start, end, domain;
863 uschar *parse_error = NULL;
864 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
868 fprintf(stdout, "syntax error: %s\n", parse_error);
873 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
874 -1, -1, NULL, NULL, NULL);
875 if (rc == FAIL) *exit_value = 2;
876 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
882 /*************************************************
883 * Show supported features *
884 *************************************************/
887 show_db_version(FILE * f)
889 #ifdef DB_VERSION_STRING
892 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
893 fprintf(f, " Runtime: %s\n",
894 db_version(NULL, NULL, NULL));
897 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
899 #elif defined(BTREEVERSION) && defined(HASHVERSION)
901 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
903 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
906 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
907 fprintf(f, "Probably ndbm\n");
908 #elif defined(USE_TDB)
909 fprintf(f, "Using tdb\n");
912 fprintf(f, "Probably GDBM (native mode)\n");
914 fprintf(f, "Probably GDBM (compatibility mode)\n");
920 /* This function is called for -bV/--version and for -d to output the optional
921 features of the current Exim binary.
923 Arguments: a FILE for printing
928 show_whats_supported(FILE * fp)
930 rmark reset_point = store_mark();
932 DEBUG(D_any) {} else show_db_version(fp);
934 g = string_cat(NULL, US"Support for:");
935 #ifdef SUPPORT_CRYPTEQ
936 g = string_cat(g, US" crypteq");
939 g = string_cat(g, US" iconv()");
942 g = string_cat(g, US" IPv6");
944 #ifdef HAVE_SETCLASSRESOURCES
945 g = string_cat(g, US" use_setclassresources");
948 g = string_cat(g, US" PAM");
951 g = string_cat(g, US" Perl");
954 g = string_cat(g, US" Expand_dlfunc");
956 #ifdef USE_TCP_WRAPPERS
957 g = string_cat(g, US" TCPwrappers");
960 g = string_cat(g, US" GnuTLS");
963 g = string_cat(g, US" OpenSSL");
965 #ifndef DISABLE_TLS_RESUME
966 g = string_cat(g, US" TLS_resume");
968 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
969 g = string_cat(g, US" translate_ip_address");
971 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
972 g = string_cat(g, US" move_frozen_messages");
974 #ifdef WITH_CONTENT_SCAN
975 g = string_cat(g, US" Content_Scanning");
978 g = string_cat(g, US" DANE");
981 g = string_cat(g, US" DKIM");
984 g = string_cat(g, US" DMARC");
986 #ifndef DISABLE_DNSSEC
987 g = string_cat(g, US" DNSSEC");
989 #ifndef DISABLE_EVENT
990 g = string_cat(g, US" Event");
993 g = string_cat(g, US" I18N");
996 g = string_cat(g, US" OCSP");
998 #ifndef DISABLE_PIPE_CONNECT
999 g = string_cat(g, US" PIPE_CONNECT");
1001 #ifndef DISABLE_PRDR
1002 g = string_cat(g, US" PRDR");
1004 #ifdef SUPPORT_PROXY
1005 g = string_cat(g, US" PROXY");
1007 #ifndef DISABLE_QUEUE_RAMP
1008 g = string_cat(g, US" Experimental_Queue_Ramp");
1010 #ifdef SUPPORT_SOCKS
1011 g = string_cat(g, US" SOCKS");
1014 g = string_cat(g, US" SPF");
1016 #if defined(SUPPORT_SRS)
1017 g = string_cat(g, US" SRS");
1021 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1023 #ifdef EXPERIMENTAL_ARC
1024 g = string_cat(g, US" Experimental_ARC");
1026 #ifdef EXPERIMENTAL_BRIGHTMAIL
1027 g = string_cat(g, US" Experimental_Brightmail");
1029 #ifdef EXPERIMENTAL_DCC
1030 g = string_cat(g, US" Experimental_DCC");
1032 #ifdef EXPERIMENTAL_DSN_INFO
1033 g = string_cat(g, US" Experimental_DSN_info");
1035 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1036 g = string_cat(g, US" Experimental_ESMTP_Limits");
1038 #ifdef EXPERIMENTAL_QUEUEFILE
1039 g = string_cat(g, US" Experimental_QUEUEFILE");
1041 #if defined(EXPERIMENTAL_SRS_ALT)
1042 g = string_cat(g, US" Experimental_SRS");
1044 g = string_cat(g, US"\n");
1046 g = string_cat(g, US"Lookups (built-in):");
1047 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1048 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1050 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1051 g = string_cat(g, US" cdb");
1053 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1054 g = string_cat(g, US" dbm dbmjz dbmnz");
1056 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1057 g = string_cat(g, US" dnsdb");
1059 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1060 g = string_cat(g, US" dsearch");
1062 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1063 g = string_cat(g, US" ibase");
1065 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1066 g = string_cat(g, US" json");
1068 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1069 g = string_cat(g, US" ldap ldapdn ldapm");
1072 g = string_cat(g, US" lmdb");
1074 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1075 g = string_cat(g, US" mysql");
1077 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1078 g = string_cat(g, US" nis nis0");
1080 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1081 g = string_cat(g, US" nisplus");
1083 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1084 g = string_cat(g, US" oracle");
1086 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1087 g = string_cat(g, US" passwd");
1089 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1090 g = string_cat(g, US" pgsql");
1092 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1093 g = string_cat(g, US" redis");
1095 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1096 g = string_cat(g, US" sqlite");
1098 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1099 g = string_cat(g, US" testdb");
1101 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1102 g = string_cat(g, US" whoson");
1104 g = string_cat(g, US"\n");
1106 g = auth_show_supported(g);
1107 g = route_show_supported(g);
1108 g = transport_show_supported(g);
1110 #ifdef WITH_CONTENT_SCAN
1111 g = malware_show_supported(g);
1114 if (fixed_never_users[0] > 0)
1117 g = string_cat(g, US"Fixed never_users: ");
1118 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1119 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1120 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1123 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1124 fputs(CS string_from_gstring(g), fp);
1126 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1128 /* Everything else is details which are only worth reporting when debugging.
1129 Perhaps the tls_version_report should move into this too. */
1132 /* clang defines __GNUC__ (at least, for me) so test for it first */
1133 #if defined(__clang__)
1134 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1135 #elif defined(__GNUC__)
1136 fprintf(fp, "Compiler: GCC [%s]\n",
1140 "? unknown version ?"
1144 fprintf(fp, "Compiler: <unknown>\n");
1147 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1148 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1149 __GLIBC__, __GLIBC_MINOR__);
1150 if (__GLIBC_PREREQ(2, 1))
1151 fprintf(fp, " Runtime: %s\n",
1152 gnu_get_libc_version());
1155 show_db_version(fp);
1158 tls_version_report(fp);
1161 utf8_version_report(fp);
1163 #ifdef SUPPORT_DMARC
1164 dmarc_version_report(fp);
1167 spf_lib_version_report(fp);
1170 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1171 if (authi->version_report)
1172 (*authi->version_report)(fp);
1174 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1175 characters; unless it's an ancient version of PCRE in which case it
1177 #ifndef PCRE_PRERELEASE
1178 # define PCRE_PRERELEASE
1181 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1182 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1184 PCRE_MAJOR, PCRE_MINOR,
1185 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1188 #undef EXPAND_AND_QUOTE
1191 for (int i = 0; i < lookup_list_count; i++)
1192 if (lookup_list[i]->version_report)
1193 lookup_list[i]->version_report(fp);
1195 #ifdef WHITELIST_D_MACROS
1196 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1198 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1200 #ifdef TRUSTED_CONFIG_LIST
1201 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1203 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1207 store_reset(reset_point);
1211 /*************************************************
1212 * Show auxiliary information about Exim *
1213 *************************************************/
1216 show_exim_information(enum commandline_info request, FILE *stream)
1221 fprintf(stream, "Oops, something went wrong.\n");
1225 "The -bI: flag takes a string indicating which information to provide.\n"
1226 "If the string is not recognised, you'll get this help (on stderr).\n"
1228 " exim -bI:help this information\n"
1229 " exim -bI:dscp list of known dscp value keywords\n"
1230 " exim -bI:sieve list of supported sieve extensions\n"
1234 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1235 fprintf(stream, "%s\n", *pp);
1238 dscp_list_to_stream(stream);
1244 /*************************************************
1245 * Quote a local part *
1246 *************************************************/
1248 /* This function is used when a sender address or a From: or Sender: header
1249 line is being created from the caller's login, or from an authenticated_id. It
1250 applies appropriate quoting rules for a local part.
1252 Argument: the local part
1253 Returns: the local part, quoted if necessary
1257 local_part_quote(uschar *lpart)
1259 BOOL needs_quote = FALSE;
1262 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1264 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1265 (*t != '.' || t == lpart || t[1] == 0);
1268 if (!needs_quote) return lpart;
1270 g = string_catn(NULL, US"\"", 1);
1274 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1277 g = string_cat(g, lpart);
1280 g = string_catn(g, lpart, nq - lpart);
1281 g = string_catn(g, US"\\", 1);
1282 g = string_catn(g, nq, 1);
1286 g = string_catn(g, US"\"", 1);
1287 return string_from_gstring(g);
1293 /*************************************************
1294 * Load readline() functions *
1295 *************************************************/
1297 /* This function is called from testing executions that read data from stdin,
1298 but only when running as the calling user. Currently, only -be does this. The
1299 function loads the readline() function library and passes back the functions.
1300 On some systems, it needs the curses library, so load that too, but try without
1301 it if loading fails. All this functionality has to be requested at build time.
1304 fn_readline_ptr pointer to where to put the readline pointer
1305 fn_addhist_ptr pointer to where to put the addhistory function
1307 Returns: the dlopen handle or NULL on failure
1311 set_readline(char * (**fn_readline_ptr)(const char *),
1312 void (**fn_addhist_ptr)(const char *))
1315 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1317 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1318 if (dlhandle_curses) dlclose(dlhandle_curses);
1322 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1323 * char * readline (const char *prompt);
1324 * void add_history (const char *string);
1326 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1327 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1330 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1338 /*************************************************
1339 * Get a line from stdin for testing things *
1340 *************************************************/
1342 /* This function is called when running tests that can take a number of lines
1343 of input (for example, -be and -bt). It handles continuations and trailing
1344 spaces. And prompting and a blank line output on eof. If readline() is in use,
1345 the arguments are non-NULL and provide the relevant functions.
1348 fn_readline readline function or NULL
1349 fn_addhist addhist function or NULL
1351 Returns: pointer to dynamic memory, or NULL at end of file
1355 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1359 if (!fn_readline) { printf("> "); fflush(stdout); }
1361 for (int i = 0;; i++)
1363 uschar buffer[1024];
1367 char *readline_line = NULL;
1370 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1371 if (*readline_line != 0 && fn_addhist) fn_addhist(readline_line);
1372 p = US readline_line;
1377 /* readline() not in use */
1380 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1384 /* Handle the line */
1386 ss = p + (int)Ustrlen(p);
1387 while (ss > p && isspace(ss[-1])) ss--;
1390 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1392 g = string_catn(g, p, ss - p);
1395 if (fn_readline) free(readline_line);
1398 /* g can only be NULL if ss==p */
1399 if (ss == p || g->s[g->ptr-1] != '\\')
1403 (void) string_from_gstring(g);
1406 if (!g) printf("\n");
1407 return string_from_gstring(g);
1412 /*************************************************
1413 * Output usage information for the program *
1414 *************************************************/
1416 /* This function is called when there are no recipients
1417 or a specific --help argument was added.
1420 progname information on what name we were called by
1422 Returns: DOES NOT RETURN
1426 exim_usage(uschar *progname)
1429 /* Handle specific program invocation variants */
1430 if (Ustrcmp(progname, US"-mailq") == 0)
1432 "mailq - list the contents of the mail queue\n\n"
1433 "For a list of options, see the Exim documentation.\n");
1435 /* Generic usage - we output this whatever happens */
1437 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1438 "not directly from a shell command line. Options and/or arguments control\n"
1439 "what it does when called. For a list of options, see the Exim documentation.\n");
1444 /*************************************************
1445 * Validate that the macros given are okay *
1446 *************************************************/
1448 /* Typically, Exim will drop privileges if macros are supplied. In some
1449 cases, we want to not do so.
1451 Arguments: opt_D_used - true if the commandline had a "-D" option
1452 Returns: true if trusted, false otherwise
1456 macros_trusted(BOOL opt_D_used)
1458 #ifdef WHITELIST_D_MACROS
1459 uschar *whitelisted, *end, *p, **whites;
1460 int white_count, i, n;
1462 BOOL prev_char_item, found;
1467 #ifndef WHITELIST_D_MACROS
1471 /* We only trust -D overrides for some invoking users:
1472 root, the exim run-time user, the optional config owner user.
1473 I don't know why config-owner would be needed, but since they can own the
1474 config files anyway, there's no security risk to letting them override -D. */
1475 if ( ! ((real_uid == root_uid)
1476 || (real_uid == exim_uid)
1477 #ifdef CONFIGURE_OWNER
1478 || (real_uid == config_uid)
1482 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1486 /* Get a list of macros which are whitelisted */
1487 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1488 prev_char_item = FALSE;
1490 for (p = whitelisted; *p != '\0'; ++p)
1492 if (*p == ':' || isspace(*p))
1497 prev_char_item = FALSE;
1500 if (!prev_char_item)
1501 prev_char_item = TRUE;
1508 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1509 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1514 if (i == white_count)
1516 while (*p != '\0' && p < end)
1522 /* The list of commandline macros should be very short.
1523 Accept the N*M complexity. */
1524 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1527 for (uschar ** w = whites; *w; ++w)
1528 if (Ustrcmp(*w, m->name) == 0)
1535 if (!m->replacement)
1537 if ((len = m->replen) == 0)
1539 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1540 0, PCRE_EOPT, NULL, 0);
1543 if (n != PCRE_ERROR_NOMATCH)
1544 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1548 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1554 /*************************************************
1555 * Expansion testing *
1556 *************************************************/
1558 /* Expand and print one item, doing macro-processing.
1561 item line for expansion
1565 expansion_test_line(const uschar * line)
1571 Ustrncpy(big_buffer, line, big_buffer_size);
1572 big_buffer[big_buffer_size-1] = '\0';
1573 len = Ustrlen(big_buffer);
1575 (void) macros_expand(0, &len, &dummy_macexp);
1577 if (isupper(big_buffer[0]))
1579 if (macro_read_assignment(big_buffer))
1580 printf("Defined macro '%s'\n", mlast->name);
1583 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1584 else printf("Failed: %s\n", expand_string_message);
1589 /*************************************************
1590 * Entry point and high-level code *
1591 *************************************************/
1593 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1594 the appropriate action. All the necessary functions are present in the one
1595 binary. I originally thought one should split it up, but it turns out that so
1596 much of the apparatus is needed in each chunk that one might as well just have
1597 it all available all the time, which then makes the coding easier as well.
1600 argc count of entries in argv
1601 argv argument strings, with argv[0] being the program name
1603 Returns: EXIT_SUCCESS if terminated successfully
1604 EXIT_FAILURE otherwise, except when a message has been sent
1605 to the sender, and -oee was given
1609 main(int argc, char **cargv)
1611 uschar **argv = USS cargv;
1612 int arg_receive_timeout = -1;
1613 int arg_smtp_receive_timeout = -1;
1614 int arg_error_handling = error_handling;
1615 int filter_sfd = -1;
1616 int filter_ufd = -1;
1619 int list_queue_option = 0;
1621 int msg_action_arg = -1;
1622 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1623 int queue_only_reason = 0;
1625 int perl_start_option = 0;
1627 int recipients_arg = argc;
1628 int sender_address_domain = 0;
1629 int test_retry_arg = -1;
1630 int test_rewrite_arg = -1;
1631 gid_t original_egid;
1632 BOOL arg_queue_only = FALSE;
1633 BOOL bi_option = FALSE;
1634 BOOL checking = FALSE;
1635 BOOL count_queue = FALSE;
1636 BOOL expansion_test = FALSE;
1637 BOOL extract_recipients = FALSE;
1638 BOOL flag_G = FALSE;
1639 BOOL flag_n = FALSE;
1640 BOOL forced_delivery = FALSE;
1641 BOOL f_end_dot = FALSE;
1642 BOOL deliver_give_up = FALSE;
1643 BOOL list_queue = FALSE;
1644 BOOL list_options = FALSE;
1645 BOOL list_config = FALSE;
1646 BOOL local_queue_only;
1647 BOOL one_msg_action = FALSE;
1648 BOOL opt_D_used = FALSE;
1649 BOOL queue_only_set = FALSE;
1650 BOOL receiving_message = TRUE;
1651 BOOL sender_ident_set = FALSE;
1652 BOOL session_local_queue_only;
1654 BOOL removed_privilege = FALSE;
1655 BOOL usage_wanted = FALSE;
1656 BOOL verify_address_mode = FALSE;
1657 BOOL verify_as_sender = FALSE;
1658 BOOL rcpt_verify_quota = FALSE;
1659 BOOL version_printed = FALSE;
1660 uschar *alias_arg = NULL;
1661 uschar *called_as = US"";
1662 uschar *cmdline_syslog_name = NULL;
1663 uschar *start_queue_run_id = NULL;
1664 uschar *stop_queue_run_id = NULL;
1665 uschar *expansion_test_message = NULL;
1666 const uschar *ftest_domain = NULL;
1667 const uschar *ftest_localpart = NULL;
1668 const uschar *ftest_prefix = NULL;
1669 const uschar *ftest_suffix = NULL;
1670 uschar *log_oneline = NULL;
1671 uschar *malware_test_file = NULL;
1672 uschar *real_sender_address;
1673 uschar *originator_home = US"/";
1677 struct stat statbuf;
1678 pid_t passed_qr_pid = (pid_t)0;
1679 int passed_qr_pipe = -1;
1680 gid_t group_list[EXIM_GROUPLIST_SIZE];
1682 /* For the -bI: flag */
1683 enum commandline_info info_flag = CMDINFO_NONE;
1684 BOOL info_stdout = FALSE;
1686 /* Possible options for -R and -S */
1688 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1690 /* Need to define this in case we need to change the environment in order
1691 to get rid of a bogus time zone. We have to make it char rather than uschar
1692 because some OS define it in /usr/include/unistd.h. */
1694 extern char **environ;
1696 #ifdef MEASURE_TIMING
1697 (void)gettimeofday(×tamp_startup, NULL);
1700 store_init(); /* Initialise the memory allocation susbsystem */
1702 /* If the Exim user and/or group and/or the configuration file owner/group were
1703 defined by ref:name at build time, we must now find the actual uid/gid values.
1704 This is a feature to make the lives of binary distributors easier. */
1706 #ifdef EXIM_USERNAME
1707 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1710 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1712 /* If ref:name uses a number as the name, route_finduser() returns
1713 TRUE with exim_uid set and pw coerced to NULL. */
1715 exim_gid = pw->pw_gid;
1716 #ifndef EXIM_GROUPNAME
1719 "exim: ref:name should specify a usercode, not a group.\n"
1720 "exim: can't let you get away with it unless you also specify a group.\n");
1724 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1727 #ifdef EXIM_GROUPNAME
1728 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1729 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1732 #ifdef CONFIGURE_OWNERNAME
1733 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1734 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1735 CONFIGURE_OWNERNAME);
1738 /* We default the system_filter_user to be the Exim run-time user, as a
1739 sane non-root value. */
1740 system_filter_uid = exim_uid;
1742 #ifdef CONFIGURE_GROUPNAME
1743 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1744 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1745 CONFIGURE_GROUPNAME);
1748 /* In the Cygwin environment, some initialization used to need doing.
1749 It was fudged in by means of this macro; now no longer but we'll leave
1750 it in case of others. */
1756 /* Check a field which is patched when we are running Exim within its
1757 testing harness; do a fast initial check, and then the whole thing. */
1759 f.running_in_test_harness =
1760 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1761 if (f.running_in_test_harness)
1764 /* Protect against abusive argv[0] */
1765 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1767 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1768 at the start of a program; however, it seems that some environments do not
1769 follow this. A "strange" locale can affect the formatting of timestamps, so we
1772 setlocale(LC_ALL, "C");
1774 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1776 #ifdef _POSIX_MONOTONIC_CLOCK
1780 /* Set up the default handler for timing using alarm(). */
1782 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1784 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1785 because store_malloc writes a log entry on failure. */
1787 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1788 exim_fail("exim: failed to get store for log buffer\n");
1790 /* Initialize the default log options. */
1792 bits_set(log_selector, log_selector_size, log_default);
1794 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1795 NULL when the daemon is run and the file is closed. We have to use this
1796 indirection, because some systems don't allow writing to the variable "stderr".
1799 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1801 /* Arrange for the PCRE regex library to use our store functions. Note that
1802 the normal calls are actually macros that add additional arguments for
1803 debugging purposes so we have to assign specially constructed functions here.
1804 The default is to use store in the stacking pool, but this is overridden in the
1805 regex_must_compile() function. */
1807 pcre_malloc = function_store_get;
1808 pcre_free = function_dummy_free;
1810 /* Ensure there is a big buffer for temporary use in several places. It is put
1811 in malloc store so that it can be freed for enlargement if necessary. */
1813 big_buffer = store_malloc(big_buffer_size);
1815 /* Set up the handler for the data request signal, and set the initial
1816 descriptive text. */
1818 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1819 set_process_info("initializing");
1820 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1821 signal(SIGSEGV, segv_handler); /* log faults */
1823 /* If running in a dockerized environment, the TERM signal is only
1824 delegated to the PID 1 if we request it by setting an signal handler */
1825 if (getpid() == 1) signal(SIGTERM, term_handler);
1827 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1828 in the daemon code. For the rest of Exim's uses, we ignore it. */
1830 signal(SIGHUP, SIG_IGN);
1832 /* We don't want to die on pipe errors as the code is written to handle
1833 the write error instead. */
1835 signal(SIGPIPE, SIG_IGN);
1837 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1838 set to SIG_IGN. This causes subprocesses that complete before the parent
1839 process waits for them not to hang around, so when Exim calls wait(), nothing
1840 is there. The wait() code has been made robust against this, but let's ensure
1841 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1842 ending status. We use sigaction rather than plain signal() on those OS where
1843 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1844 problem on AIX with this.) */
1848 struct sigaction act;
1849 act.sa_handler = SIG_DFL;
1850 sigemptyset(&(act.sa_mask));
1852 sigaction(SIGCHLD, &act, NULL);
1855 signal(SIGCHLD, SIG_DFL);
1858 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1863 /* Set up the version number. Set up the leading 'E' for the external form of
1864 message ids, set the pointer to the internal form, and initialize it to
1865 indicate no message being processed. */
1868 message_id_option[0] = '-';
1869 message_id_external = message_id_option + 1;
1870 message_id_external[0] = 'E';
1871 message_id = message_id_external + 1;
1874 /* Set the umask to zero so that any files Exim creates using open() are
1875 created with the modes that it specifies. NOTE: Files created with fopen() have
1876 a problem, which was not recognized till rather late (February 2006). With this
1877 umask, such files will be world writeable. (They are all content scanning files
1878 in the spool directory, which isn't world-accessible, so this is not a
1879 disaster, but it's untidy.) I don't want to change this overall setting,
1880 however, because it will interact badly with the open() calls. Instead, there's
1881 now a function called modefopen() that fiddles with the umask while calling
1886 /* Precompile the regular expression for matching a message id. Keep this in
1887 step with the code that generates ids in the accept.c module. We need to do
1888 this here, because the -M options check their arguments for syntactic validity
1889 using mac_ismsgid, which uses this. */
1892 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1894 /* Precompile the regular expression that is used for matching an SMTP error
1895 code, possibly extended, at the start of an error message. Note that the
1896 terminating whitespace character is included. */
1899 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1902 #ifdef WHITELIST_D_MACROS
1903 /* Precompile the regular expression used to filter the content of macros
1904 given to -D for permissibility. */
1906 regex_whitelisted_macro =
1907 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1910 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1912 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1913 this seems to be a generally accepted convention, since one finds symbolic
1914 links called "mailq" in standard OS configurations. */
1916 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1917 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1920 receiving_message = FALSE;
1921 called_as = US"-mailq";
1924 /* If the program is called as "rmail" treat it as equivalent to
1925 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1926 i.e. preventing a single dot on a line from terminating the message, and
1927 returning with zero return code, even in cases of error (provided an error
1928 message has been sent). */
1930 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1931 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1934 called_as = US"-rmail";
1935 errors_sender_rc = EXIT_SUCCESS;
1938 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1939 this is a smail convention. */
1941 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1942 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1944 smtp_input = smtp_batched_input = TRUE;
1945 called_as = US"-rsmtp";
1948 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1949 this is a smail convention. */
1951 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1952 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1955 receiving_message = FALSE;
1956 called_as = US"-runq";
1959 /* If the program is called as "newaliases" treat it as equivalent to
1960 "exim -bi"; this is a sendmail convention. */
1962 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1963 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1966 receiving_message = FALSE;
1967 called_as = US"-newaliases";
1970 /* Save the original effective uid for a couple of uses later. It should
1971 normally be root, but in some esoteric environments it may not be. */
1973 original_euid = geteuid();
1974 original_egid = getegid();
1976 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1977 to be the same as the real ones. This makes a difference only if Exim is setuid
1978 (or setgid) to something other than root, which could be the case in some
1979 special configurations. */
1981 real_uid = getuid();
1982 real_gid = getgid();
1984 if (real_uid == root_uid)
1986 if ((rv = setgid(real_gid)))
1987 exim_fail("exim: setgid(%ld) failed: %s\n",
1988 (long int)real_gid, strerror(errno));
1989 if ((rv = setuid(real_uid)))
1990 exim_fail("exim: setuid(%ld) failed: %s\n",
1991 (long int)real_uid, strerror(errno));
1994 /* If neither the original real uid nor the original euid was root, Exim is
1995 running in an unprivileged state. */
1997 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1999 /* For most of the args-parsing we need to use permanent pool memory */
2001 int old_pool = store_pool;
2002 store_pool = POOL_PERM;
2004 /* Scan the program's arguments. Some can be dealt with right away; others are
2005 simply recorded for checking and handling afterwards. Do a high-level switch
2006 on the second character (the one after '-'), to save some effort. */
2008 for (i = 1; i < argc; i++)
2010 BOOL badarg = FALSE;
2011 uschar * arg = argv[i];
2015 /* An argument not starting with '-' is the start of a recipients list;
2016 break out of the options-scanning loop. */
2024 /* An option consisting of -- terminates the options */
2026 if (Ustrcmp(arg, "--") == 0)
2028 recipients_arg = i + 1;
2032 /* Handle flagged options */
2034 switchchar = arg[1];
2037 /* Make all -ex options synonymous with -oex arguments, since that
2038 is assumed by various callers. Also make -qR options synonymous with -R
2039 options, as that seems to be required as well. Allow for -qqR too, and
2040 the same for -S options. */
2042 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2043 Ustrncmp(arg+1, "qR", 2) == 0 ||
2044 Ustrncmp(arg+1, "qS", 2) == 0)
2046 switchchar = arg[2];
2049 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2051 switchchar = arg[3];
2053 f.queue_2stage = TRUE;
2056 /* Make -r synonymous with -f, since it is a documented alias */
2058 else if (arg[1] == 'r') switchchar = 'f';
2060 /* Make -ov synonymous with -v */
2062 else if (Ustrcmp(arg, "-ov") == 0)
2068 /* deal with --option_aliases */
2069 else if (switchchar == '-')
2071 if (Ustrcmp(argrest, "help") == 0)
2073 usage_wanted = TRUE;
2076 else if (Ustrcmp(argrest, "version") == 0)
2083 /* High-level switch on active initial letter */
2088 /* sendmail uses -Ac and -Am to control which .cf file is used;
2091 if (!*argrest) { badarg = TRUE; break; }
2094 BOOL ignore = FALSE;
2099 if (*(argrest + 1) == '\0')
2103 if (!ignore) badarg = TRUE;
2107 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2108 so has no need of it. */
2111 if (!*argrest) i++; /* Skip over the type */
2117 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2121 /* -bd: Run in daemon mode, awaiting SMTP connections.
2122 -bdf: Ditto, but in the foreground.
2125 f.daemon_listen = TRUE;
2126 if (*argrest == 'f') f.background_daemon = FALSE;
2127 else if (*argrest) badarg = TRUE;
2130 /* -be: Run in expansion test mode
2131 -bem: Ditto, but read a message from a file first
2134 expansion_test = checking = TRUE;
2135 if (*argrest == 'm')
2137 if (++i >= argc) { badarg = TRUE; break; }
2138 expansion_test_message = argv[i];
2141 if (*argrest) badarg = TRUE;
2144 /* -bF: Run system filter test */
2146 filter_test |= checking = FTEST_SYSTEM;
2147 if (*argrest) badarg = TRUE;
2148 else if (++i < argc) filter_test_sfile = argv[i];
2149 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2152 /* -bf: Run user filter test
2153 -bfd: Set domain for filter testing
2154 -bfl: Set local part for filter testing
2155 -bfp: Set prefix for filter testing
2156 -bfs: Set suffix for filter testing
2161 filter_test |= checking = FTEST_USER;
2162 if (++i < argc) filter_test_ufile = argv[i];
2163 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2168 exim_fail("exim: string expected after %s\n", arg);
2169 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2170 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2171 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2172 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2177 /* -bh: Host checking - an IP address must follow. */
2179 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2181 if (++i >= argc) { badarg = TRUE; break; }
2182 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), TRUE);
2183 host_checking = checking = f.log_testing_mode = TRUE;
2184 f.host_checking_callout = *argrest == 'c';
2185 message_logs = FALSE;
2190 /* -bi: This option is used by sendmail to initialize *the* alias file,
2191 though it has the -oA option to specify a different file. Exim has no
2192 concept of *the* alias file, but since Sun's YP make script calls
2193 sendmail this way, some support must be provided. */
2195 if (!*argrest) bi_option = TRUE;
2199 /* -bI: provide information, of the type to follow after a colon.
2200 This is an Exim flag. */
2202 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2204 uschar *p = argrest+1;
2205 info_flag = CMDINFO_HELP;
2207 if (strcmpic(p, CUS"sieve") == 0)
2209 info_flag = CMDINFO_SIEVE;
2212 else if (strcmpic(p, CUS"dscp") == 0)
2214 info_flag = CMDINFO_DSCP;
2217 else if (strcmpic(p, CUS"help") == 0)
2223 /* -bm: Accept and deliver message - the default option. Reinstate
2224 receiving_message, which got turned off for all -b options.
2225 -bmalware: test the filename given for malware */
2227 if (!*argrest) receiving_message = TRUE;
2228 else if (Ustrcmp(argrest, "alware") == 0)
2230 if (++i >= argc) { badarg = TRUE; break; }
2232 malware_test_file = argv[i];
2237 /* -bnq: For locally originating messages, do not qualify unqualified
2238 addresses. In the envelope, this causes errors; in header lines they
2241 if (Ustrcmp(argrest, "q") == 0)
2243 f.allow_unqualified_sender = FALSE;
2244 f.allow_unqualified_recipient = FALSE;
2249 /* -bpxx: List the contents of the mail queue, in various forms. If
2250 the option is -bpc, just a queue count is needed. Otherwise, if the
2251 first letter after p is r, then order is random. */
2253 if (*argrest == 'c')
2256 if (*++argrest) badarg = TRUE;
2260 if (*argrest == 'r')
2262 list_queue_option = 8;
2265 else list_queue_option = 0;
2269 /* -bp: List the contents of the mail queue, top-level only */
2273 /* -bpu: List the contents of the mail queue, top-level undelivered */
2275 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2277 /* -bpa: List the contents of the mail queue, including all delivered */
2279 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2281 /* Unknown after -bp[r] */
2287 /* -bP: List the configuration variables given as the address list.
2288 Force -v, so configuration errors get displayed. */
2291 /* -bP config: we need to setup here, because later,
2292 when list_options is checked, the config is read already */
2295 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2298 readconf_save_config(version_string);
2302 list_options = TRUE;
2303 debug_selector |= D_v;
2304 debug_file = stderr;
2308 /* -brt: Test retry configuration lookup */
2310 if (Ustrcmp(argrest, "t") == 0)
2313 test_retry_arg = i + 1;
2317 /* -brw: Test rewrite configuration */
2319 else if (Ustrcmp(argrest, "w") == 0)
2322 test_rewrite_arg = i + 1;
2328 /* -bS: Read SMTP commands on standard input, but produce no replies -
2329 all errors are reported by sending messages. */
2332 smtp_input = smtp_batched_input = receiving_message = TRUE;
2336 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2337 on standard output. */
2339 if (!*argrest) smtp_input = receiving_message = TRUE;
2343 /* -bt: address testing mode */
2346 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2350 /* -bv: verify addresses */
2353 verify_address_mode = checking = f.log_testing_mode = TRUE;
2355 /* -bvs: verify sender addresses */
2357 else if (Ustrcmp(argrest, "s") == 0)
2359 verify_address_mode = checking = f.log_testing_mode = TRUE;
2360 verify_as_sender = TRUE;
2365 /* -bV: Print version string and support details */
2369 printf("Exim version %s #%s built %s\n", version_string,
2370 version_cnumber, version_date);
2371 printf("%s\n", CS version_copyright);
2372 version_printed = TRUE;
2373 show_whats_supported(stdout);
2374 f.log_testing_mode = TRUE;
2379 /* -bw: inetd wait mode, accept a listening socket as stdin */
2381 f.inetd_wait_mode = TRUE;
2382 f.background_daemon = FALSE;
2383 f.daemon_listen = TRUE;
2385 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2386 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2397 /* -C: change configuration file list; ignore if it isn't really
2398 a change! Enforce a prefix check if required. */
2402 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2403 if (Ustrcmp(config_main_filelist, argrest) != 0)
2405 #ifdef ALT_CONFIG_PREFIX
2407 int len = Ustrlen(ALT_CONFIG_PREFIX);
2408 const uschar *list = argrest;
2410 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2411 while((filename = string_nextinlist(&list, &sep, big_buffer,
2413 if ( ( Ustrlen(filename) < len
2414 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2415 || Ustrstr(filename, "/../") != NULL
2417 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2419 exim_fail("-C Permission denied\n");
2421 if (real_uid != root_uid)
2423 #ifdef TRUSTED_CONFIG_LIST
2425 if (real_uid != exim_uid
2426 #ifdef CONFIGURE_OWNER
2427 && real_uid != config_uid
2430 f.trusted_config = FALSE;
2433 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2436 struct stat statbuf;
2438 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2439 (statbuf.st_uid != root_uid /* owner not root */
2440 #ifdef CONFIGURE_OWNER
2441 && statbuf.st_uid != config_uid /* owner not the special one */
2444 (statbuf.st_gid != root_gid /* group not root */
2445 #ifdef CONFIGURE_GROUP
2446 && statbuf.st_gid != config_gid /* group not the special one */
2448 && (statbuf.st_mode & 020) != 0 /* group writeable */
2450 (statbuf.st_mode & 2) != 0) /* world writeable */
2452 f.trusted_config = FALSE;
2457 /* Well, the trust list at least is up to scratch... */
2459 uschar *trusted_configs[32];
2462 int old_pool = store_pool;
2463 store_pool = POOL_MAIN;
2465 reset_point = store_mark();
2466 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2468 uschar *start = big_buffer, *nl;
2469 while (*start && isspace(*start))
2473 nl = Ustrchr(start, '\n');
2476 trusted_configs[nr_configs++] = string_copy(start);
2477 if (nr_configs == nelem(trusted_configs))
2485 const uschar *list = argrest;
2487 while (f.trusted_config && (filename = string_nextinlist(&list,
2488 &sep, big_buffer, big_buffer_size)))
2490 for (i=0; i < nr_configs; i++)
2491 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2493 if (i == nr_configs)
2495 f.trusted_config = FALSE;
2500 else /* No valid prefixes found in trust_list file. */
2501 f.trusted_config = FALSE;
2502 store_reset(reset_point);
2503 store_pool = old_pool;
2506 else /* Could not open trust_list file. */
2507 f.trusted_config = FALSE;
2510 /* Not root; don't trust config */
2511 f.trusted_config = FALSE;
2515 config_main_filelist = argrest;
2516 f.config_changed = TRUE;
2521 /* -D: set up a macro definition */
2524 #ifdef DISABLE_D_OPTION
2525 exim_fail("exim: -D is not available in this Exim binary\n");
2531 uschar *s = argrest;
2534 while (isspace(*s)) s++;
2536 if (*s < 'A' || *s > 'Z')
2537 exim_fail("exim: macro name set by -D must start with "
2538 "an upper case letter\n");
2540 while (isalnum(*s) || *s == '_')
2542 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2546 if (ptr == 0) { badarg = TRUE; break; }
2547 while (isspace(*s)) s++;
2550 if (*s++ != '=') { badarg = TRUE; break; }
2551 while (isspace(*s)) s++;
2554 for (m = macros_user; m; m = m->next)
2555 if (Ustrcmp(m->name, name) == 0)
2556 exim_fail("exim: duplicated -D in command line\n");
2558 m = macro_create(name, s, TRUE);
2560 if (clmacro_count >= MAX_CLMACROS)
2561 exim_fail("exim: too many -D options on command line\n");
2562 clmacros[clmacro_count++] =
2563 string_sprintf("-D%s=%s", m->name, m->replacement);
2568 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2569 The latter is now a no-op, retained for compatibility only. If -dd is used,
2570 debugging subprocesses of the daemon is disabled. */
2573 if (Ustrcmp(argrest, "ropcr") == 0)
2575 /* drop_cr = TRUE; */
2578 /* Use an intermediate variable so that we don't set debugging while
2579 decoding the debugging bits. */
2583 unsigned int selector = D_default;
2586 if (*argrest == 'd')
2588 f.debug_daemon = TRUE;
2592 decode_bits(&selector, 1, debug_notall, argrest,
2593 debug_options, debug_options_count, US"debug", 0);
2594 debug_selector = selector;
2599 /* -E: This is a local error message. This option is not intended for
2600 external use at all, but is not restricted to trusted callers because it
2601 does no harm (just suppresses certain error messages) and if Exim is run
2602 not setuid root it won't always be trusted when it generates error
2603 messages using this option. If there is a message id following -E, point
2604 message_reference at it, for logging. */
2607 f.local_error_message = TRUE;
2608 if (mac_ismsgid(argrest)) message_reference = argrest;
2612 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2613 option, so it looks as if historically the -oex options are also callable
2614 without the leading -o. So we have to accept them. Before the switch,
2615 anything starting -oe has been converted to -e. Exim does not support all
2616 of the sendmail error options. */
2619 if (Ustrcmp(argrest, "e") == 0)
2621 arg_error_handling = ERRORS_SENDER;
2622 errors_sender_rc = EXIT_SUCCESS;
2624 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2625 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2626 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2627 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2632 /* -F: Set sender's full name, used instead of the gecos entry from
2633 the password file. Since users can usually alter their gecos entries,
2634 there's no security involved in using this instead. The data can follow
2635 the -F or be in the next argument. */
2639 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2640 originator_name = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), TRUE);
2641 f.sender_name_forced = TRUE;
2645 /* -f: Set sender's address - this value is only actually used if Exim is
2646 run by a trusted user, or if untrusted_set_sender is set and matches the
2647 address, except that the null address can always be set by any user. The
2648 test for this happens later, when the value given here is ignored when not
2649 permitted. For an untrusted user, the actual sender is still put in Sender:
2650 if it doesn't match the From: header (unless no_local_from_check is set).
2651 The data can follow the -f or be in the next argument. The -r switch is an
2652 obsolete form of -f but since there appear to be programs out there that
2653 use anything that sendmail has ever supported, better accept it - the
2654 synonymizing is done before the switch above.
2656 At this stage, we must allow domain literal addresses, because we don't
2657 know what the setting of allow_domain_literals is yet. Ditto for trailing
2658 dots and strip_trailing_dot. */
2662 int dummy_start, dummy_end;
2665 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2666 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2668 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2671 uschar * temp = argrest + Ustrlen(argrest) - 1;
2672 while (temp >= argrest && isspace(*temp)) temp--;
2673 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2674 allow_domain_literals = TRUE;
2675 strip_trailing_dot = TRUE;
2677 allow_utf8_domains = TRUE;
2679 if (!(sender_address = parse_extract_address(argrest, &errmess,
2680 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2681 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2683 sender_address = string_copy_taint(sender_address, TRUE);
2685 message_smtputf8 = string_is_utf8(sender_address);
2686 allow_utf8_domains = FALSE;
2688 allow_domain_literals = FALSE;
2689 strip_trailing_dot = FALSE;
2691 f.sender_address_forced = TRUE;
2695 /* -G: sendmail invocation to specify that it's a gateway submission and
2696 sendmail may complain about problems instead of fixing them.
2697 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2698 not at this time complain about problems. */
2704 /* -h: Set the hop count for an incoming message. Exim does not currently
2705 support this; it always computes it by counting the Received: headers.
2706 To put it in will require a change to the spool header file format. */
2710 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2711 if (!isdigit(*argrest)) badarg = TRUE;
2715 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2716 not to be documented for sendmail but mailx (at least) uses it) */
2719 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2723 /* -L: set the identifier used for syslog; equivalent to setting
2724 syslog_processname in the config file, but needs to be an admin option. */
2728 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2729 if ((sz = Ustrlen(argrest)) > 32)
2730 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2732 exim_fail("exim: the -L syslog name is too short\n");
2733 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2737 receiving_message = FALSE;
2739 /* -MC: continue delivery of another message via an existing open
2740 file descriptor. This option is used for an internal call by the
2741 smtp transport when there is a pending message waiting to go to an
2742 address to which it has got a connection. Five subsequent arguments are
2743 required: transport name, host name, IP address, sequence number, and
2744 message_id. Transports may decline to create new processes if the sequence
2745 number gets too big. The channel is stdin. This (-MC) must be the last
2746 argument. There's a subsequent check that the real-uid is privileged.
2748 If we are running in the test harness. delay for a bit, to let the process
2749 that set this one up complete. This makes for repeatability of the logging,
2752 if (Ustrcmp(argrest, "C") == 0)
2754 union sockaddr_46 interface_sock;
2755 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2758 exim_fail("exim: too many or too few arguments after -MC\n");
2760 if (msg_action_arg >= 0)
2761 exim_fail("exim: incompatible arguments\n");
2763 continue_transport = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), TRUE);
2764 continue_hostname = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), TRUE);
2765 continue_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), TRUE);
2766 continue_sequence = Uatoi(argv[++i]);
2767 msg_action = MSG_DELIVER;
2768 msg_action_arg = ++i;
2769 forced_delivery = TRUE;
2770 queue_run_pid = passed_qr_pid;
2771 queue_run_pipe = passed_qr_pipe;
2773 if (!mac_ismsgid(argv[i]))
2774 exim_fail("exim: malformed message id %s after -MC option\n",
2777 /* Set up $sending_ip_address and $sending_port, unless proxied */
2779 if (!continue_proxy_cipher)
2780 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2782 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2785 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2788 testharness_pause_ms(500);
2792 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2796 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2797 precedes -MC (see above). The flag indicates that the host to which
2798 Exim is connected has accepted an AUTH sequence. */
2800 case 'A': f.smtp_authenticated = TRUE; break;
2802 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2803 that exim is connected to supports the esmtp extension DSN */
2805 case 'D': smtp_peer_options |= OPTION_DSN; break;
2807 /* -MCd: for debug, set a process-purpose string */
2809 case 'd': if (++i < argc)
2810 process_purpose = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), TRUE);
2814 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2815 from the commandline should be tainted - but we will need an untainted
2816 value for the spoolfile when doing a -odi delivery process. */
2818 case 'G': if (++i < argc) queue_name = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), FALSE);
2822 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2824 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2826 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2827 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2828 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2830 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2832 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2837 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2838 it preceded -MC (see above) */
2840 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2842 #ifdef SUPPORT_SOCKS
2843 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2844 case 'p': proxy_session = TRUE;
2847 proxy_local_address = string_copy_taint(argv[i], TRUE);
2850 proxy_local_port = Uatoi(argv[i]);
2853 proxy_external_address = string_copy_taint(argv[i], TRUE);
2856 proxy_external_port = Uatoi(argv[i]);
2862 /* -MCQ: pass on the pid of the queue-running process that started
2863 this chain of deliveries and the fd of its synchronizing pipe; this
2864 is useful only when it precedes -MC (see above) */
2866 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2868 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2872 /* -MCq: do a quota check on the given recipient for the given size
2873 of message. Separate from -MC. */
2874 case 'q': rcpt_verify_quota = TRUE;
2875 if (++i < argc) message_size = Uatoi(argv[i]);
2879 /* -MCS: set the smtp_use_size flag; this is useful only when it
2880 precedes -MC (see above) */
2882 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2885 /* -MCs: used with -MCt; SNI was sent */
2886 /* -MCr: ditto, DANE */
2889 case 's': if (++i < argc)
2891 continue_proxy_sni = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), TRUE);
2892 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
2897 /* -MCt: similar to -MCT below but the connection is still open
2898 via a proxy process which handles the TLS context and coding.
2899 Require three arguments for the proxied local address and port,
2900 and the TLS cipher. */
2902 case 't': if (++i < argc)
2903 sending_ip_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), TRUE);
2906 sending_port = (int)(Uatol(argv[i]));
2909 continue_proxy_cipher = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), TRUE);
2913 /* -MCT: set the tls_offered 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 offered TLS support. */
2917 case 'T': smtp_peer_options |= OPTION_TLS; break;
2920 default: badarg = TRUE; break;
2925 /* -M[x]: various operations on the following list of message ids:
2926 -M deliver the messages, ignoring next retry times and thawing
2927 -Mc deliver the messages, checking next retry times, no thawing
2928 -Mf freeze the messages
2929 -Mg give up on the messages
2930 -Mt thaw the messages
2931 -Mrm remove the messages
2932 In the above cases, this must be the last option. There are also the
2933 following options which are followed by a single message id, and which
2934 act on that message. Some of them use the "recipient" addresses as well.
2935 -Mar add recipient(s)
2936 -MG move to a different queue
2937 -Mmad mark all recipients delivered
2938 -Mmd mark recipients(s) delivered
2940 -Mset load a message for use with -be
2942 -Mvc show copy (of whole message, in RFC 2822 format)
2949 msg_action = MSG_DELIVER;
2950 forced_delivery = f.deliver_force_thaw = TRUE;
2952 else if (Ustrcmp(argrest, "ar") == 0)
2954 msg_action = MSG_ADD_RECIPIENT;
2955 one_msg_action = TRUE;
2957 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2958 else if (Ustrcmp(argrest, "es") == 0)
2960 msg_action = MSG_EDIT_SENDER;
2961 one_msg_action = TRUE;
2963 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2964 else if (Ustrcmp(argrest, "g") == 0)
2966 msg_action = MSG_DELIVER;
2967 deliver_give_up = TRUE;
2969 else if (Ustrcmp(argrest, "G") == 0)
2971 msg_action = MSG_SETQUEUE;
2972 queue_name_dest = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), TRUE);
2974 else if (Ustrcmp(argrest, "mad") == 0)
2976 msg_action = MSG_MARK_ALL_DELIVERED;
2978 else if (Ustrcmp(argrest, "md") == 0)
2980 msg_action = MSG_MARK_DELIVERED;
2981 one_msg_action = TRUE;
2983 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2984 else if (Ustrcmp(argrest, "set") == 0)
2986 msg_action = MSG_LOAD;
2987 one_msg_action = TRUE;
2989 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2990 else if (Ustrcmp(argrest, "vb") == 0)
2992 msg_action = MSG_SHOW_BODY;
2993 one_msg_action = TRUE;
2995 else if (Ustrcmp(argrest, "vc") == 0)
2997 msg_action = MSG_SHOW_COPY;
2998 one_msg_action = TRUE;
3000 else if (Ustrcmp(argrest, "vh") == 0)
3002 msg_action = MSG_SHOW_HEADER;
3003 one_msg_action = TRUE;
3005 else if (Ustrcmp(argrest, "vl") == 0)
3007 msg_action = MSG_SHOW_LOG;
3008 one_msg_action = TRUE;
3010 else { badarg = TRUE; break; }
3012 /* All the -Mxx options require at least one message id. */
3014 msg_action_arg = i + 1;
3015 if (msg_action_arg >= argc)
3016 exim_fail("exim: no message ids given after %s option\n", arg);
3018 /* Some require only message ids to follow */
3020 if (!one_msg_action)
3022 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3023 exim_fail("exim: malformed message id %s after %s option\n",
3025 goto END_ARG; /* Remaining args are ids */
3028 /* Others require only one message id, possibly followed by addresses,
3029 which will be handled as normal arguments. */
3033 if (!mac_ismsgid(argv[msg_action_arg]))
3034 exim_fail("exim: malformed message id %s after %s option\n",
3035 argv[msg_action_arg], arg);
3041 /* Some programs seem to call the -om option without the leading o;
3042 for sendmail it askes for "me too". Exim always does this. */
3045 if (*argrest) badarg = TRUE;
3049 /* -N: don't do delivery - a debugging option that stops transports doing
3050 their thing. It implies debugging at the D_v level. */
3055 f.dont_deliver = TRUE;
3056 debug_selector |= D_v;
3057 debug_file = stderr;
3063 /* -n: This means "don't alias" in sendmail, apparently.
3064 For normal invocations, it has no effect.
3065 It may affect some other options. */
3071 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3072 option to the specified value. This form uses long names. We need to handle
3073 -O option=value and -Ooption=value. */
3078 exim_fail("exim: string expected after -O\n");
3084 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3087 if (!*(alias_arg = argrest))
3088 if (i+1 < argc) alias_arg = argv[++i];
3089 else exim_fail("exim: string expected after -oA\n");
3092 /* -oB: Set a connection message max value for remote deliveries */
3095 uschar * p = argrest;
3097 if (i+1 < argc && isdigit((argv[i+1][0])))
3101 connection_max_messages = 1;
3108 exim_fail("exim: number expected after -oB\n");
3109 connection_max_messages = Uatoi(p);
3114 /* -odb: background delivery */
3117 if (Ustrcmp(argrest, "b") == 0)
3119 f.synchronous_delivery = FALSE;
3120 arg_queue_only = FALSE;
3121 queue_only_set = TRUE;
3124 /* -odd: testsuite-only: add no inter-process delays */
3126 else if (Ustrcmp(argrest, "d") == 0)
3127 f.testsuite_delays = FALSE;
3129 /* -odf: foreground delivery (smail-compatible option); same effect as
3130 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3133 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3135 f.synchronous_delivery = TRUE;
3136 arg_queue_only = FALSE;
3137 queue_only_set = TRUE;
3140 /* -odq: queue only */
3142 else if (Ustrcmp(argrest, "q") == 0)
3144 f.synchronous_delivery = FALSE;
3145 arg_queue_only = TRUE;
3146 queue_only_set = TRUE;
3149 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3150 but no remote delivery */
3152 else if (Ustrcmp(argrest, "qs") == 0)
3154 f.queue_smtp = TRUE;
3155 arg_queue_only = FALSE;
3156 queue_only_set = TRUE;
3161 /* -oex: Sendmail error flags. As these are also accepted without the
3162 leading -o prefix, for compatibility with vacation and other callers,
3163 they are handled with -e above. */
3165 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3166 -oitrue: Another sendmail syntax for the same */
3169 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3174 /* -oM*: Set various characteristics for an incoming message; actually
3175 acted on for trusted callers only. */
3180 exim_fail("exim: data expected after -oM%s\n", argrest);
3182 /* -oMa: Set sender host address */
3184 if (Ustrcmp(argrest, "a") == 0)
3185 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), TRUE);
3187 /* -oMaa: Set authenticator name */
3189 else if (Ustrcmp(argrest, "aa") == 0)
3190 sender_host_authenticated = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), TRUE);
3192 /* -oMas: setting authenticated sender */
3194 else if (Ustrcmp(argrest, "as") == 0)
3195 authenticated_sender = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3197 /* -oMai: setting authenticated id */
3199 else if (Ustrcmp(argrest, "ai") == 0)
3200 authenticated_id = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3202 /* -oMi: Set incoming interface address */
3204 else if (Ustrcmp(argrest, "i") == 0)
3205 interface_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), TRUE);
3207 /* -oMm: Message reference */
3209 else if (Ustrcmp(argrest, "m") == 0)
3211 if (!mac_ismsgid(argv[i+1]))
3212 exim_fail("-oMm must be a valid message ID\n");
3213 if (!f.trusted_config)
3214 exim_fail("-oMm must be called by a trusted user/config\n");
3215 message_reference = argv[++i];
3218 /* -oMr: Received protocol */
3220 else if (Ustrcmp(argrest, "r") == 0)
3222 if (received_protocol)
3223 exim_fail("received_protocol is set already\n");
3225 received_protocol = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), TRUE);
3227 /* -oMs: Set sender host name */
3229 else if (Ustrcmp(argrest, "s") == 0)
3230 sender_host_name = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), TRUE);
3232 /* -oMt: Set sender ident */
3234 else if (Ustrcmp(argrest, "t") == 0)
3236 sender_ident_set = TRUE;
3237 sender_ident = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), TRUE);
3240 /* Else a bad argument */
3247 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3248 seem to call this as -m (undocumented), so that is also accepted (see
3250 /* -oo: An ancient flag for old-style addresses which still seems to
3251 crop up in some calls (see in SCO). */
3255 if (*argrest) badarg = TRUE;
3258 /* -oP <name>: set pid file path for daemon
3259 -oPX: delete pid file of daemon */
3262 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3263 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3264 "(uid=%d euid=%d | %d)\n",
3265 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3266 if (!*argrest) override_pid_file_path = argv[++i];
3267 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3272 /* -or <n>: set timeout for non-SMTP acceptance
3273 -os <n>: set timeout for SMTP acceptance */
3278 int * tp = argrest[-1] == 'r'
3279 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3281 *tp = readconf_readtime(argrest, 0, FALSE);
3282 else if (i+1 < argc)
3283 *tp = readconf_readtime(argv[++i], 0, FALSE);
3286 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3290 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3291 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3294 if (*argrest) badarg = TRUE;
3295 else override_local_interfaces = string_copy_taint(exim_str_fail_toolong(argv[++i], 1024, "-oX"), TRUE);
3298 /* -oY: Override creation of daemon notifier socket */
3301 if (*argrest) badarg = TRUE;
3302 else notifier_socket = NULL;
3305 /* Unknown -o argument */
3313 /* -ps: force Perl startup; -pd force delayed Perl startup */
3317 if (*argrest == 's' && argrest[1] == 0)
3319 perl_start_option = 1;
3322 if (*argrest == 'd' && argrest[1] == 0)
3324 perl_start_option = -1;
3329 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3330 which sets the host protocol and host name */
3333 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3337 uschar * hn = Ustrchr(argrest, ':');
3339 if (received_protocol)
3340 exim_fail("received_protocol is set already\n");
3343 received_protocol = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), TRUE);
3346 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3347 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3348 sender_host_name = string_copy_taint(hn + 1, TRUE);
3355 receiving_message = FALSE;
3356 if (queue_interval >= 0)
3357 exim_fail("exim: -q specified more than once\n");
3359 /* -qq...: Do queue runs in a 2-stage manner */
3361 if (*argrest == 'q')
3363 f.queue_2stage = TRUE;
3367 /* -qi...: Do only first (initial) deliveries */
3369 if (*argrest == 'i')
3371 f.queue_run_first_delivery = TRUE;
3375 /* -qf...: Run the queue, forcing deliveries
3376 -qff..: Ditto, forcing thawing as well */
3378 if (*argrest == 'f')
3380 f.queue_run_force = TRUE;
3381 if (*++argrest == 'f')
3383 f.deliver_force_thaw = TRUE;
3388 /* -q[f][f]l...: Run the queue only on local deliveries */
3390 if (*argrest == 'l')
3392 f.queue_run_local = TRUE;
3396 /* -q[f][f][l][G<name>]... Work on the named queue */
3398 if (*argrest == 'G')
3401 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3402 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3403 queue_name = string_copyn(argrest, i);
3405 if (*argrest == '/') argrest++;
3408 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3409 only, optionally named, optionally starting from a given message id. */
3411 if (!(list_queue || count_queue))
3413 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3416 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3417 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3418 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3419 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3422 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3423 forced, optionally local only, optionally named. */
3425 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3427 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3431 case 'R': /* Synonymous with -qR... */
3433 const uschar *tainted_selectstr;
3435 receiving_message = FALSE;
3437 /* -Rf: As -R (below) but force all deliveries,
3438 -Rff: Ditto, but also thaw all frozen messages,
3439 -Rr: String is regex
3440 -Rrf: Regex and force
3441 -Rrff: Regex and force and thaw
3443 in all cases provided there are no further characters in this
3447 for (int i = 0; i < nelem(rsopts); i++)
3448 if (Ustrcmp(argrest, rsopts[i]) == 0)
3450 if (i != 2) f.queue_run_force = TRUE;
3451 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3452 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3453 argrest += Ustrlen(rsopts[i]);
3456 /* -R: Set string to match in addresses for forced queue run to
3457 pick out particular messages. */
3459 /* Avoid attacks from people providing very long strings, and do so before
3462 tainted_selectstr = argrest;
3463 else if (i+1 < argc)
3464 tainted_selectstr = argv[++i];
3466 exim_fail("exim: string expected after -R\n");
3467 deliver_selectstring = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), TRUE);
3471 /* -r: an obsolete synonym for -f (see above) */
3474 /* -S: Like -R but works on sender. */
3476 case 'S': /* Synonymous with -qS... */
3478 const uschar *tainted_selectstr;
3480 receiving_message = FALSE;
3482 /* -Sf: As -S (below) but force all deliveries,
3483 -Sff: Ditto, but also thaw all frozen messages,
3484 -Sr: String is regex
3485 -Srf: Regex and force
3486 -Srff: Regex and force and thaw
3488 in all cases provided there are no further characters in this
3492 for (int i = 0; i < nelem(rsopts); i++)
3493 if (Ustrcmp(argrest, rsopts[i]) == 0)
3495 if (i != 2) f.queue_run_force = TRUE;
3496 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3497 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3498 argrest += Ustrlen(rsopts[i]);
3501 /* -S: Set string to match in addresses for forced queue run to
3502 pick out particular messages. */
3505 tainted_selectstr = argrest;
3506 else if (i+1 < argc)
3507 tainted_selectstr = argv[++i];
3509 exim_fail("exim: string expected after -S\n");
3510 deliver_selectstring_sender = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), TRUE);
3514 /* -Tqt is an option that is exclusively for use by the testing suite.
3515 It is not recognized in other circumstances. It allows for the setting up
3516 of explicit "queue times" so that various warning/retry things can be
3517 tested. Otherwise variability of clock ticks etc. cause problems. */
3520 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3521 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3526 /* -t: Set flag to extract recipients from body of message. */
3529 if (!*argrest) extract_recipients = TRUE;
3531 /* -ti: Set flag to extract recipients from body of message, and also
3532 specify that dot does not end the message. */
3534 else if (Ustrcmp(argrest, "i") == 0)
3536 extract_recipients = TRUE;
3540 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3543 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3550 /* -U: This means "initial user submission" in sendmail, apparently. The
3551 doc claims that in future sendmail may refuse syntactically invalid
3552 messages instead of fixing them. For the moment, we just ignore it. */
3558 /* -v: verify things - this is a very low-level debugging */
3563 debug_selector |= D_v;
3564 debug_file = stderr;
3570 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3572 The -x flag tells the sendmail command that mail from a local
3573 mail program has National Language Support (NLS) extended characters
3574 in the body of the mail item. The sendmail command can send mail with
3575 extended NLS characters across networks that normally corrupts these
3578 As Exim is 8-bit clean, it just ignores this flag. */
3581 if (*argrest) badarg = TRUE;
3584 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3585 logs to that file. We swallow the parameter and otherwise ignore it. */
3590 exim_fail("exim: string expected after -X\n");
3593 /* -z: a line of text to log */
3598 log_oneline = string_copy_taint(exim_str_fail_toolong(argv[i], 2048, "-z logtext"), TRUE);
3600 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3603 /* All other initial characters are errors */
3608 } /* End of high-level switch statement */
3610 /* Failed to recognize the option, or syntax error */
3613 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3614 "option %s\n", arg);
3618 /* If -R or -S have been specified without -q, assume a single queue run. */
3620 if ( (deliver_selectstring || deliver_selectstring_sender)
3621 && queue_interval < 0)
3626 store_pool = old_pool;
3629 /* If usage_wanted is set we call the usage function - which never returns */
3630 if (usage_wanted) exim_usage(called_as);
3632 /* Arguments have been processed. Check for incompatibilities. */
3633 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3634 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3635 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3636 || filter_test != FTEST_NONE
3637 || msg_action_arg > 0 && !one_msg_action
3639 || ( msg_action_arg > 0
3640 && ( f.daemon_listen || queue_interval > 0 || list_options
3641 || checking && msg_action != MSG_LOAD
3642 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3644 || ( (f.daemon_listen || queue_interval > 0)
3645 && ( sender_address || list_options || list_queue || checking
3648 || f.daemon_listen && queue_interval == 0
3649 || f.inetd_wait_mode && queue_interval >= 0
3651 && ( checking || smtp_input || extract_recipients
3652 || filter_test != FTEST_NONE || bi_option
3654 || ( verify_address_mode
3655 && ( f.address_test_mode || smtp_input || extract_recipients
3656 || filter_test != FTEST_NONE || bi_option
3658 || ( f.address_test_mode
3659 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3663 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3665 || deliver_selectstring && queue_interval < 0
3666 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3668 exim_fail("exim: incompatible command-line options or arguments\n");
3670 /* If debugging is set up, set the file and the file descriptor to pass on to
3671 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3672 to run in the foreground. */
3674 if (debug_selector != 0)
3676 debug_file = stderr;
3677 debug_fd = fileno(debug_file);
3678 f.background_daemon = FALSE;
3679 testharness_pause_ms(100); /* lets caller finish */
3680 if (debug_selector != D_v) /* -v only doesn't show this */
3682 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3683 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3685 if (!version_printed)
3686 show_whats_supported(stderr);
3690 /* When started with root privilege, ensure that the limits on the number of
3691 open files and the number of processes (where that is accessible) are
3692 sufficiently large, or are unset, in case Exim has been called from an
3693 environment where the limits are screwed down. Not all OS have the ability to
3694 change some of these limits. */
3698 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3704 #ifdef RLIMIT_NOFILE
3705 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3707 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3709 rlp.rlim_cur = rlp.rlim_max = 0;
3712 /* I originally chose 1000 as a nice big number that was unlikely to
3713 be exceeded. It turns out that some older OS have a fixed upper limit of
3716 if (rlp.rlim_cur < 1000)
3718 rlp.rlim_cur = rlp.rlim_max = 1000;
3719 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3721 rlp.rlim_cur = rlp.rlim_max = 256;
3722 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3723 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3730 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3732 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3734 rlp.rlim_cur = rlp.rlim_max = 0;
3737 # ifdef RLIM_INFINITY
3738 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3740 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3742 if (rlp.rlim_cur < 1000)
3744 rlp.rlim_cur = rlp.rlim_max = 1000;
3746 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3747 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3753 /* Exim is normally entered as root (but some special configurations are
3754 possible that don't do this). However, it always spins off sub-processes that
3755 set their uid and gid as required for local delivery. We don't want to pass on
3756 any extra groups that root may belong to, so we want to get rid of them all at
3759 We need to obey setgroups() at this stage, before possibly giving up root
3760 privilege for a changed configuration file, but later on we might need to
3761 check on the additional groups for the admin user privilege - can't do that
3762 till after reading the config, which might specify the exim gid. Therefore,
3763 save the group list here first. */
3765 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3766 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3768 /* There is a fundamental difference in some BSD systems in the matter of
3769 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3770 known not to be different. On the "different" systems there is a single group
3771 list, and the first entry in it is the current group. On all other versions of
3772 Unix there is a supplementary group list, which is in *addition* to the current
3773 group. Consequently, to get rid of all extraneous groups on a "standard" system
3774 you pass over 0 groups to setgroups(), while on a "different" system you pass
3775 over a single group - the current group, which is always the first group in the
3776 list. Calling setgroups() with zero groups on a "different" system results in
3777 an error return. The following code should cope with both types of system.
3779 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3780 the "setgroups() with zero groups" - and changes the egid.
3781 Thanks to that we had to stash the original_egid above, for use below
3782 in the call to exim_setugid().
3784 However, if this process isn't running as root, setgroups() can't be used
3785 since you have to be root to run it, even if throwing away groups.
3786 Except, sigh, for Hurd - where you can.
3787 Not being root here happens only in some unusual configurations. */
3790 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3791 && setgroups(0, NULL) != 0
3793 && setgroups(1, group_list) != 0)
3794 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3796 /* If the configuration file name has been altered by an argument on the
3797 command line (either a new file name or a macro definition) and the caller is
3798 not root, or if this is a filter testing run, remove any setuid privilege the
3799 program has and run as the underlying user.
3801 The exim user is locked out of this, which severely restricts the use of -C
3804 Otherwise, set the real ids to the effective values (should be root unless run
3805 from inetd, which it can either be root or the exim uid, if one is configured).
3807 There is a private mechanism for bypassing some of this, in order to make it
3808 possible to test lots of configurations automatically, without having either to
3809 recompile each time, or to patch in an actual configuration file name and other
3810 values (such as the path name). If running in the test harness, pretend that
3811 configuration file changes and macro definitions haven't happened. */
3814 (!f.trusted_config || /* Config changed, or */
3815 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3816 real_uid != root_uid && /* Not root, and */
3817 !f.running_in_test_harness /* Not fudged */
3819 expansion_test /* expansion testing */
3821 filter_test != FTEST_NONE) /* Filter testing */
3823 setgroups(group_count, group_list);
3824 exim_setugid(real_uid, real_gid, FALSE,
3825 US"-C, -D, -be or -bf forces real uid");
3826 removed_privilege = TRUE;
3828 /* In the normal case when Exim is called like this, stderr is available
3829 and should be used for any logging information because attempts to write
3830 to the log will usually fail. To arrange this, we unset really_exim. However,
3831 if no stderr is available there is no point - we might as well have a go
3832 at the log (if it fails, syslog will be written).
3834 Note that if the invoker is Exim, the logs remain available. Messing with
3835 this causes unlogged successful deliveries. */
3837 if (log_stderr && real_uid != exim_uid)
3838 f.really_exim = FALSE;
3841 /* Privilege is to be retained for the moment. It may be dropped later,
3842 depending on the job that this Exim process has been asked to do. For now, set
3843 the real uid to the effective so that subsequent re-execs of Exim are done by a
3847 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3849 /* If testing a filter, open the file(s) now, before wasting time doing other
3850 setups and reading the message. */
3852 if (filter_test & FTEST_SYSTEM)
3853 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3854 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3857 if (filter_test & FTEST_USER)
3858 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3859 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3862 /* Initialise lookup_list
3863 If debugging, already called above via version reporting.
3864 In either case, we initialise the list of available lookups while running
3865 as root. All dynamically modules are loaded from a directory which is
3866 hard-coded into the binary and is code which, if not a module, would be
3867 part of Exim already. Ability to modify the content of the directory
3868 is equivalent to the ability to modify a setuid binary!
3870 This needs to happen before we read the main configuration. */
3873 /*XXX this excrescence could move to the testsuite standard config setup file */
3875 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3878 /* Read the main runtime configuration data; this gives up if there
3879 is a failure. It leaves the configuration file open so that the subsequent
3880 configuration data for delivery can be read if needed.
3882 NOTE: immediately after opening the configuration file we change the working
3883 directory to "/"! Later we change to $spool_directory. We do it there, because
3884 during readconf_main() some expansion takes place already. */
3886 /* Store the initial cwd before we change directories. Can be NULL if the
3887 dir has already been unlinked. */
3888 initial_cwd = os_getcwd(NULL, 0);
3889 if (!initial_cwd && errno)
3890 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
3892 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
3893 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
3896 -be[m] expansion test -
3897 -b[fF] filter test new
3899 -bmalware malware_test_file new
3901 -brw rewrite test new
3903 -bv[s] address verify -
3905 -bP <option> (except -bP config, which sets list_config)
3907 If any of these options is set, we suppress warnings about configuration
3908 issues (currently about tls_advertise_hosts and keep_environment not being
3912 int old_pool = store_pool;
3913 #ifdef MEASURE_TIMING
3914 struct timeval t0, diff;
3915 (void)gettimeofday(&t0, NULL);
3918 store_pool = POOL_CONFIG;
3919 readconf_main(checking || list_options);
3920 store_pool = old_pool;
3922 #ifdef MEASURE_TIMING
3923 report_time_since(&t0, US"readconf_main (delta)");
3927 /* Now in directory "/" */
3929 if (cleanup_environment() == FALSE)
3930 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3933 /* If an action on specific messages is requested, or if a daemon or queue
3934 runner is being started, we need to know if Exim was called by an admin user.
3935 This is the case if the real user is root or exim, or if the real group is
3936 exim, or if one of the supplementary groups is exim or a group listed in
3937 admin_groups. We don't fail all message actions immediately if not admin_user,
3938 since some actions can be performed by non-admin users. Instead, set admin_user
3939 for later interrogation. */
3941 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3942 f.admin_user = TRUE;
3944 for (int i = 0; i < group_count && !f.admin_user; i++)
3945 if (group_list[i] == exim_gid)
3946 f.admin_user = TRUE;
3947 else if (admin_groups)
3948 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3949 if (admin_groups[j] == group_list[i])
3950 f.admin_user = TRUE;
3952 /* Another group of privileged users are the trusted users. These are root,
3953 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3954 are permitted to specify sender_addresses with -f on the command line, and
3955 other message parameters as well. */
3957 if (real_uid == root_uid || real_uid == exim_uid)
3958 f.trusted_caller = TRUE;
3962 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3963 if (trusted_users[i] == real_uid)
3964 f.trusted_caller = TRUE;
3967 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3968 if (trusted_groups[i] == real_gid)
3969 f.trusted_caller = TRUE;
3970 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3971 if (trusted_groups[i] == group_list[j])
3972 f.trusted_caller = TRUE;
3975 /* At this point, we know if the user is privileged and some command-line
3976 options become possibly impermissible, depending upon the configuration file. */
3978 if (checking && commandline_checks_require_admin && !f.admin_user)
3979 exim_fail("exim: those command-line flags are set to require admin\n");
3981 /* Handle the decoding of logging options. */
3983 decode_bits(log_selector, log_selector_size, log_notall,
3984 log_selector_string, log_options, log_options_count, US"log", 0);
3988 debug_printf("configuration file is %s\n", config_main_filename);
3989 debug_printf("log selectors =");
3990 for (int i = 0; i < log_selector_size; i++)
3991 debug_printf(" %08x", log_selector[i]);
3995 /* If domain literals are not allowed, check the sender address that was
3996 supplied with -f. Ditto for a stripped trailing dot. */
4000 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4001 exim_fail("exim: bad -f address \"%s\": domain literals not "
4002 "allowed\n", sender_address);
4003 if (f_end_dot && !strip_trailing_dot)
4004 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4005 "(trailing dot not allowed)\n", sender_address);
4008 /* See if an admin user overrode our logging. */
4010 if (cmdline_syslog_name)
4013 syslog_processname = cmdline_syslog_name;
4014 log_file_path = string_copy(CUS"syslog");
4017 /* not a panic, non-privileged users should not be able to spam paniclog */
4019 "exim: you lack sufficient privilege to specify syslog process name\n");
4021 /* Paranoia check of maximum lengths of certain strings. There is a check
4022 on the length of the log file path in log.c, which will come into effect
4023 if there are any calls to write the log earlier than this. However, if we
4024 get this far but the string is very long, it is better to stop now than to
4025 carry on and (e.g.) receive a message and then have to collapse. The call to
4026 log_write() from here will cause the ultimate panic collapse if the complete
4027 file name exceeds the buffer length. */
4029 if (Ustrlen(log_file_path) > 200)
4030 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4031 "log_file_path is longer than 200 chars: aborting");
4033 if (Ustrlen(pid_file_path) > 200)
4034 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4035 "pid_file_path is longer than 200 chars: aborting");
4037 if (Ustrlen(spool_directory) > 200)
4038 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4039 "spool_directory is longer than 200 chars: aborting");
4041 /* Length check on the process name given to syslog for its TAG field,
4042 which is only permitted to be 32 characters or less. See RFC 3164. */
4044 if (Ustrlen(syslog_processname) > 32)
4045 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4046 "syslog_processname is longer than 32 chars: aborting");
4051 log_write(0, LOG_MAIN, "%s", log_oneline);
4052 return EXIT_SUCCESS;
4055 return EXIT_FAILURE;
4057 /* In some operating systems, the environment variable TMPDIR controls where
4058 temporary files are created; Exim doesn't use these (apart from when delivering
4059 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4060 If TMPDIR is found in the environment, reset it to the value defined in the
4061 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4062 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4063 EXIM_TMPDIR by the build scripts.
4067 if (environ) for (uschar ** p = USS environ; *p; p++)
4068 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4070 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4071 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4073 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4077 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4078 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4079 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4080 called by a user who has set the TZ variable. This then affects the timestamps
4081 in log files and in Received: headers, and any created Date: header lines. The
4082 required timezone is settable in the configuration file, so nothing can be done
4083 about this earlier - but hopefully nothing will normally be logged earlier than
4084 this. We have to make a new environment if TZ is wrong, but don't bother if
4085 timestamps_utc is set, because then all times are in UTC anyway. */
4087 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4088 f.timestamps_utc = TRUE;
4091 uschar *envtz = US getenv("TZ");
4093 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4094 : timezone_string != NULL
4097 uschar **p = USS environ;
4101 if (environ) while (*p++) count++;
4102 if (!envtz) count++;
4103 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4104 if (environ) for (p = USS environ; *p; p++)
4105 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4106 if (timezone_string)
4108 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4109 sprintf(CS *newp++, "TZ=%s", timezone_string);
4114 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4115 tod_stamp(tod_log));
4119 /* Handle the case when we have removed the setuid privilege because of -C or
4120 -D. This means that the caller of Exim was not root.
4122 There is a problem if we were running as the Exim user. The sysadmin may
4123 expect this case to retain privilege because "the binary was called by the
4124 Exim user", but it hasn't, because either the -D option set macros, or the
4125 -C option set a non-trusted configuration file. There are two possibilities:
4127 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4128 to do message deliveries. Thus, the fact that it is running as a
4129 non-privileged user is plausible, and might be wanted in some special
4130 configurations. However, really_exim will have been set false when
4131 privilege was dropped, to stop Exim trying to write to its normal log
4132 files. Therefore, re-enable normal log processing, assuming the sysadmin
4133 has set up the log directory correctly.
4135 (2) If deliver_drop_privilege is not set, the configuration won't work as
4136 apparently intended, and so we log a panic message. In order to retain
4137 root for -C or -D, the caller must either be root or be invoking a
4138 trusted configuration file (when deliver_drop_privilege is false). */
4140 if ( removed_privilege
4141 && (!f.trusted_config || opt_D_used)
4142 && real_uid == exim_uid)
4143 if (deliver_drop_privilege)
4144 f.really_exim = TRUE; /* let logging work normally */
4146 log_write(0, LOG_MAIN|LOG_PANIC,
4147 "exim user lost privilege for using %s option",
4148 f.trusted_config? "-D" : "-C");
4150 /* Start up Perl interpreter if Perl support is configured and there is a
4151 perl_startup option, and the configuration or the command line specifies
4152 initializing starting. Note that the global variables are actually called
4153 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4156 if (perl_start_option != 0)
4157 opt_perl_at_start = (perl_start_option > 0);
4158 if (opt_perl_at_start && opt_perl_startup != NULL)
4161 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4162 if ((errstr = init_perl(opt_perl_startup)))
4163 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4164 opt_perl_started = TRUE;
4166 #endif /* EXIM_PERL */
4168 /* Log the arguments of the call if the configuration file said so. This is
4169 a debugging feature for finding out what arguments certain MUAs actually use.
4170 Don't attempt it if logging is disabled, or if listing variables or if
4171 verifying/testing addresses or expansions. */
4173 if ( (debug_selector & D_any || LOGGING(arguments))
4174 && f.really_exim && !list_options && !checking)
4176 uschar *p = big_buffer;
4177 Ustrcpy(p, US"cwd= (failed)");
4184 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4185 p += Ustrlen(CCS p);
4188 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4190 for (int i = 0; i < argc; i++)
4192 int len = Ustrlen(argv[i]);
4193 const uschar *printing;
4195 if (p + len + 8 >= big_buffer + big_buffer_size)
4197 Ustrcpy(p, US" ...");
4198 log_write(0, LOG_MAIN, "%s", big_buffer);
4199 Ustrcpy(big_buffer, US"...");
4202 printing = string_printing(argv[i]);
4203 if (!*printing) quote = US"\"";
4206 const uschar *pp = printing;
4208 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4210 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4211 (p - big_buffer) - 4), printing, quote);
4214 if (LOGGING(arguments))
4215 log_write(0, LOG_MAIN, "%s", big_buffer);
4217 debug_printf("%s\n", big_buffer);
4220 /* Set the working directory to be the top-level spool directory. We don't rely
4221 on this in the code, which always uses fully qualified names, but it's useful
4222 for core dumps etc. Don't complain if it fails - the spool directory might not
4223 be generally accessible and calls with the -C option (and others) have lost
4224 privilege by now. Before the chdir, we try to ensure that the directory exists.
4227 if (Uchdir(spool_directory) != 0)
4229 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4230 (void) Uchdir(spool_directory);
4233 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4234 alias file. Exim doesn't have such a concept, but this call is screwed into
4235 Sun's YP makefiles. Handle this by calling a configured script, as the real
4236 user who called Exim. The -oA option can be used to pass an argument to the
4241 (void) fclose(config_file);
4242 if (bi_command && *bi_command)
4246 argv[i++] = bi_command;
4247 if (alias_arg) argv[i++] = alias_arg;
4250 setgroups(group_count, group_list);
4251 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4253 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4254 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4256 execv(CS argv[0], (char *const *)argv);
4257 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4261 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4266 /* We moved the admin/trusted check to be immediately after reading the
4267 configuration file. We leave these prints here to ensure that syslog setup,
4268 logfile setup, and so on has already happened. */
4270 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4271 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4273 /* Only an admin user may start the daemon or force a queue run in the default
4274 configuration, but the queue run restriction can be relaxed. Only an admin
4275 user may request that a message be returned to its sender forthwith. Only an
4276 admin user may specify a debug level greater than D_v (because it might show
4277 passwords, etc. in lookup queries). Only an admin user may request a queue
4278 count. Only an admin user can use the test interface to scan for email
4279 (because Exim will be in the spool dir and able to look at mails). */
4283 BOOL debugset = (debug_selector & ~D_v) != 0;
4284 if ( deliver_give_up || f.daemon_listen || malware_test_file
4285 || count_queue && queue_list_requires_admin
4286 || list_queue && queue_list_requires_admin
4287 || queue_interval >= 0 && prod_requires_admin
4288 || queue_name_dest && prod_requires_admin
4289 || debugset && !f.running_in_test_harness
4291 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4294 /* If the real user is not root or the exim uid, the argument for passing
4295 in an open TCP/IP connection for another message is not permitted, nor is
4296 running with the -N option for any delivery action, unless this call to exim is
4297 one that supplied an input message, or we are using a patched exim for
4298 regression testing. */
4300 if ( real_uid != root_uid && real_uid != exim_uid
4301 && ( continue_hostname
4303 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4305 && !f.running_in_test_harness
4307 exim_fail("exim: Permission denied\n");
4309 /* If the caller is not trusted, certain arguments are ignored when running for
4310 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4311 Note that authority for performing certain actions on messages is tested in the
4312 queue_action() function. */
4314 if (!f.trusted_caller && !checking)
4316 sender_host_name = sender_host_address = interface_address =
4317 sender_ident = received_protocol = NULL;
4318 sender_host_port = interface_port = 0;
4319 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4322 /* If a sender host address is set, extract the optional port number off the
4323 end of it and check its syntax. Do the same thing for the interface address.
4324 Exim exits if the syntax is bad. */
4328 if (sender_host_address)
4329 sender_host_port = check_port(sender_host_address);
4330 if (interface_address)
4331 interface_port = check_port(interface_address);
4334 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4337 if (f.trusted_caller)
4339 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4340 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4343 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4346 /* If an SMTP message is being received check to see if the standard input is a
4347 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4348 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4353 union sockaddr_46 inetd_sock;
4354 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4355 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4357 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4358 if (family == AF_INET || family == AF_INET6)
4360 union sockaddr_46 interface_sock;
4361 size = sizeof(interface_sock);
4363 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4364 interface_address = host_ntoa(-1, &interface_sock, NULL,
4367 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4369 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4372 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4373 NULL, &sender_host_port);
4374 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4375 "inetd is not supported when mua_wrapper is set");
4379 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4384 /* If the load average is going to be needed while receiving a message, get it
4385 now for those OS that require the first call to os_getloadavg() to be done as
4386 root. There will be further calls later for each message received. */
4388 #ifdef LOAD_AVG_NEEDS_ROOT
4389 if ( receiving_message
4390 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4391 load_average = OS_GETLOADAVG();
4394 /* The queue_only configuration option can be overridden by -odx on the command
4395 line, except that if queue_only_override is false, queue_only cannot be unset
4396 from the command line. */
4398 if (queue_only_set && (queue_only_override || arg_queue_only))
4399 queue_only = arg_queue_only;
4401 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4404 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4405 if (arg_smtp_receive_timeout >= 0)
4406 smtp_receive_timeout = arg_smtp_receive_timeout;
4408 /* If Exim was started with root privilege, unless we have already removed the
4409 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4410 except when starting the daemon or doing some kind of delivery or address
4411 testing (-bt). These are the only cases when root need to be retained. We run
4412 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4413 retained only for starting the daemon. We always do the initgroups() in this
4414 situation (controlled by the TRUE below), in order to be as close as possible
4415 to the state Exim usually runs in. */
4417 if ( !unprivileged /* originally had root AND */
4418 && !removed_privilege /* still got root AND */
4419 && !f.daemon_listen /* not starting the daemon */
4420 && queue_interval <= 0 /* (either kind of daemon) */
4421 && ( /* AND EITHER */
4422 deliver_drop_privilege /* requested unprivileged */
4424 queue_interval < 0 /* not running the queue */
4425 && ( msg_action_arg < 0 /* and */
4426 || msg_action != MSG_DELIVER /* not delivering */
4428 && (!checking || !f.address_test_mode) /* not address checking */
4429 && !rcpt_verify_quota /* and not quota checking */
4431 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4433 /* When we are retaining a privileged uid, we still change to the exim gid. */
4438 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4439 rv = setgid(exim_gid);
4440 /* Impact of failure is that some stuff might end up with an incorrect group.
4441 We track this for failures from root, since any attempt to change privilege
4442 by root should succeed and failures should be examined. For non-root,
4443 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4444 no need to complain then. */
4446 if (!(unprivileged || removed_privilege))
4447 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4450 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4451 (long int)exim_gid, strerror(errno));
4455 /* Handle a request to scan a file for malware */
4456 if (malware_test_file)
4458 #ifdef WITH_CONTENT_SCAN
4460 set_process_info("scanning file for malware");
4461 if ((result = malware_in_file(malware_test_file)) == FAIL)
4463 printf("No malware found.\n");
4468 printf("Malware lookup returned non-okay/fail: %d\n", result);
4472 printf("Malware found: %s\n", malware_name);
4474 printf("Malware scan detected malware of unknown name.\n");
4476 printf("Malware scanning not enabled at compile time.\n");
4481 /* Handle a request to list the delivery queue */
4485 set_process_info("listing the queue");
4486 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4490 /* Handle a request to count the delivery queue */
4494 set_process_info("counting the queue");
4495 fprintf(stdout, "%u\n", queue_count());
4499 /* Handle actions on specific messages, except for the force delivery and
4500 message load actions, which are done below. Some actions take a whole list of
4501 message ids, which are known to continue up to the end of the arguments. Others
4502 take a single message id and then operate on the recipients list. */
4504 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4506 int yield = EXIT_SUCCESS;
4507 set_process_info("acting on specified messages");
4509 /* ACL definitions may be needed when removing a message (-Mrm) because
4510 event_action gets expanded */
4512 if (msg_action == MSG_REMOVE)
4514 int old_pool = store_pool;
4515 store_pool = POOL_CONFIG;
4517 store_pool = old_pool;
4518 store_writeprotect(POOL_CONFIG);
4521 if (!one_msg_action)
4523 for (i = msg_action_arg; i < argc; i++)
4524 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4525 yield = EXIT_FAILURE;
4528 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4529 default: printf("\n"); break;
4533 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4534 recipients_arg)) yield = EXIT_FAILURE;
4538 /* We used to set up here to skip reading the ACL section, on
4539 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4540 Now, since the intro of the ${acl } expansion, ACL definitions may be
4541 needed in transports so we lost the optimisation. */
4544 int old_pool = store_pool;
4545 #ifdef MEASURE_TIMING
4546 struct timeval t0, diff;
4547 (void)gettimeofday(&t0, NULL);
4550 store_pool = POOL_CONFIG;
4552 store_pool = old_pool;
4553 store_writeprotect(POOL_CONFIG);
4555 #ifdef MEASURE_TIMING
4556 report_time_since(&t0, US"readconf_rest (delta)");
4560 /* Handle a request to check quota */
4561 if (rcpt_verify_quota)
4562 if (real_uid != root_uid && real_uid != exim_uid)
4563 exim_fail("exim: Permission denied\n");
4564 else if (recipients_arg >= argc)
4565 exim_fail("exim: missing recipient for quota check\n");
4568 verify_quota(argv[recipients_arg]);
4569 exim_exit(EXIT_SUCCESS);
4572 /* Handle the -brt option. This is for checking out retry configurations.
4573 The next three arguments are a domain name or a complete address, and
4574 optionally two error numbers. All it does is to call the function that
4575 scans the retry configuration data. */
4577 if (test_retry_arg >= 0)
4579 retry_config *yield;
4580 int basic_errno = 0;
4582 const uschar *s1, *s2;
4584 if (test_retry_arg >= argc)
4586 printf("-brt needs a domain or address argument\n");
4587 exim_exit(EXIT_FAILURE);
4589 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4592 /* If the first argument contains no @ and no . it might be a local user
4593 or it might be a single-component name. Treat as a domain. */
4595 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4597 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4598 "being \ntreated as a one-component domain, not as a local part.\n\n",
4602 /* There may be an optional second domain arg. */
4604 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4605 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4607 /* The final arg is an error name */
4609 if (test_retry_arg < argc)
4611 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4613 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4616 printf("%s\n", CS error);
4617 return EXIT_FAILURE;
4620 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4621 code > 100 as an error is for matching codes to the decade. Turn them into
4622 a real error code, off the decade. */
4624 if (basic_errno == ERRNO_MAIL4XX ||
4625 basic_errno == ERRNO_RCPT4XX ||
4626 basic_errno == ERRNO_DATA4XX)
4628 int code = (more_errno >> 8) & 255;
4630 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4631 else if (code > 100)
4632 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4636 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4637 printf("No retry information found\n");
4640 more_errno = yield->more_errno;
4641 printf("Retry rule: %s ", yield->pattern);
4643 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4645 printf("quota%s%s ",
4646 (more_errno > 0)? "_" : "",
4647 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4649 else if (yield->basic_errno == ECONNREFUSED)
4651 printf("refused%s%s ",
4652 (more_errno > 0)? "_" : "",
4653 (more_errno == 'M')? "MX" :
4654 (more_errno == 'A')? "A" : "");
4656 else if (yield->basic_errno == ETIMEDOUT)
4659 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4661 if (more_errno != 0) printf("_%s",
4662 (more_errno == 'M')? "MX" : "A");
4665 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4666 printf("auth_failed ");
4669 for (retry_rule * r = yield->rules; r; r = r->next)
4671 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4672 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4678 printf(",%d.", x/1000);
4692 exim_exit(EXIT_SUCCESS);
4695 /* Handle a request to list one or more configuration options */
4696 /* If -n was set, we suppress some information */
4701 set_process_info("listing variables");
4702 if (recipients_arg >= argc)
4703 fail = !readconf_print(US"all", NULL, flag_n);
4704 else for (i = recipients_arg; i < argc; i++)
4707 (Ustrcmp(argv[i], "router") == 0 ||
4708 Ustrcmp(argv[i], "transport") == 0 ||
4709 Ustrcmp(argv[i], "authenticator") == 0 ||
4710 Ustrcmp(argv[i], "macro") == 0 ||
4711 Ustrcmp(argv[i], "environment") == 0))
4713 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4717 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4719 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4724 set_process_info("listing config");
4725 exim_exit(readconf_print(US"config", NULL, flag_n)
4726 ? EXIT_SUCCESS : EXIT_FAILURE);
4730 /* Initialise subsystems as required. */
4734 /* Handle a request to deliver one or more messages that are already on the
4735 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4736 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4738 Delivery of specific messages is typically used for a small number when
4739 prodding by hand (when the option forced_delivery will be set) or when
4740 re-execing to regain root privilege. Each message delivery must happen in a
4741 separate process, so we fork a process for each one, and run them sequentially
4742 so that debugging output doesn't get intertwined, and to avoid spawning too
4743 many processes if a long list is given. However, don't fork for the last one;
4744 this saves a process in the common case when Exim is called to deliver just one
4747 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4749 if (prod_requires_admin && !f.admin_user)
4751 fprintf(stderr, "exim: Permission denied\n");
4752 exim_exit(EXIT_FAILURE);
4754 set_process_info("delivering specified messages");
4755 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4756 for (i = msg_action_arg; i < argc; i++)
4760 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4761 that runs into a later copy into the untainted global message_id[] */
4762 /*XXX Do we need a length limit check here? */
4764 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4765 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4767 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4768 exim_underbar_exit(EXIT_SUCCESS);
4772 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4774 exim_exit(EXIT_FAILURE);
4778 exim_exit(EXIT_SUCCESS);
4782 /* If only a single queue run is requested, without SMTP listening, we can just
4783 turn into a queue runner, with an optional starting message id. */
4785 if (queue_interval == 0 && !f.daemon_listen)
4787 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4788 start_queue_run_id ? US" starting at " : US"",
4789 start_queue_run_id ? start_queue_run_id: US"",
4790 stop_queue_run_id ? US" stopping at " : US"",
4791 stop_queue_run_id ? stop_queue_run_id : US"");
4793 set_process_info("running the '%s' queue (single queue run)", queue_name);
4795 set_process_info("running the queue (single queue run)");
4796 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4797 exim_exit(EXIT_SUCCESS);
4801 /* Find the login name of the real user running this process. This is always
4802 needed when receiving a message, because it is written into the spool file. It
4803 may also be used to construct a from: or a sender: header, and in this case we
4804 need the user's full name as well, so save a copy of it, checked for RFC822
4805 syntax and munged if necessary, if it hasn't previously been set by the -F
4806 argument. We may try to get the passwd entry more than once, in case NIS or
4807 other delays are in evidence. Save the home directory for use in filter testing
4812 if ((pw = getpwuid(real_uid)) != NULL)
4814 originator_login = string_copy(US pw->pw_name);
4815 originator_home = string_copy(US pw->pw_dir);
4817 /* If user name has not been set by -F, set it from the passwd entry
4818 unless -f has been used to set the sender address by a trusted user. */
4820 if (!originator_name)
4822 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4824 uschar *name = US pw->pw_gecos;
4825 uschar *amp = Ustrchr(name, '&');
4828 /* Most Unix specify that a '&' character in the gecos field is
4829 replaced by a copy of the login name, and some even specify that
4830 the first character should be upper cased, so that's what we do. */
4835 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4836 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4837 buffer[loffset] = toupper(buffer[loffset]);
4841 /* If a pattern for matching the gecos field was supplied, apply
4842 it and then expand the name string. */
4844 if (gecos_pattern && gecos_name)
4847 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4849 if (regex_match_and_setup(re, name, 0, -1))
4851 uschar *new_name = expand_string(gecos_name);
4855 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4856 "gecos field \"%s\"\n", new_name, name);
4859 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4860 "\"%s\": %s\n", gecos_name, expand_string_message);
4862 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4863 "gecos field \"%s\"\n", gecos_pattern, name);
4864 store_free((void *)re);
4866 originator_name = string_copy(name);
4869 /* A trusted caller has used -f but not -F */
4871 else originator_name = US"";
4874 /* Break the retry loop */
4879 if (++i > finduser_retries) break;
4883 /* If we cannot get a user login, log the incident and give up, unless the
4884 configuration specifies something to use. When running in the test harness,
4885 any setting of unknown_login overrides the actual name. */
4887 if (!originator_login || f.running_in_test_harness)
4891 originator_login = expand_string(unknown_login);
4892 if (!originator_name && unknown_username)
4893 originator_name = expand_string(unknown_username);
4894 if (!originator_name) originator_name = US"";
4896 if (!originator_login)
4897 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4901 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4904 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
4906 /* If a message is created by this call of Exim, the uid/gid of its originator
4907 are those of the caller. These values are overridden if an existing message is
4908 read in from the spool. */
4910 originator_uid = real_uid;
4911 originator_gid = real_gid;
4913 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4914 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4916 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4917 returns. We leave this till here so that the originator_ fields are available
4918 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4921 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4925 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4926 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4927 "mua_wrapper is set");
4930 # ifndef DISABLE_TLS
4931 /* This also checks that the library linkage is working and we can call
4932 routines in it, so call even if tls_require_ciphers is unset */
4934 # ifdef MEASURE_TIMING
4935 struct timeval t0, diff;
4936 (void)gettimeofday(&t0, NULL);
4938 if (!tls_dropprivs_validate_require_cipher(FALSE))
4940 # ifdef MEASURE_TIMING
4941 report_time_since(&t0, US"validate_ciphers (delta)");
4949 /* If the sender ident has not been set (by a trusted caller) set it to
4950 the caller. This will get overwritten below for an inetd call. If a trusted
4951 caller has set it empty, unset it. */
4953 if (!sender_ident) sender_ident = originator_login;
4954 else if (!*sender_ident) sender_ident = NULL;
4956 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4957 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4958 originator_* variables set. */
4960 if (test_rewrite_arg >= 0)
4962 f.really_exim = FALSE;
4963 if (test_rewrite_arg >= argc)
4965 printf("-brw needs an address argument\n");
4966 exim_exit(EXIT_FAILURE);
4968 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
4969 exim_exit(EXIT_SUCCESS);
4972 /* A locally-supplied message is considered to be coming from a local user
4973 unless a trusted caller supplies a sender address with -f, or is passing in the
4974 message via SMTP (inetd invocation or otherwise). */
4976 if ( !sender_address && !smtp_input
4977 || !f.trusted_caller && filter_test == FTEST_NONE)
4979 f.sender_local = TRUE;
4981 /* A trusted caller can supply authenticated_sender and authenticated_id
4982 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4983 defaults except when host checking. */
4985 if (!authenticated_sender && !host_checking)
4986 authenticated_sender = string_sprintf("%s@%s", originator_login,
4987 qualify_domain_sender);
4988 if (!authenticated_id && !host_checking)
4989 authenticated_id = originator_login;
4992 /* Trusted callers are always permitted to specify the sender address.
4993 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4994 is specified is the empty address. However, if a trusted caller does not
4995 specify a sender address for SMTP input, we leave sender_address unset. This
4996 causes the MAIL commands to be honoured. */
4998 if ( !smtp_input && !sender_address
4999 || !receive_check_set_sender(sender_address))
5001 /* Either the caller is not permitted to set a general sender, or this is
5002 non-SMTP input and the trusted caller has not set a sender. If there is no
5003 sender, or if a sender other than <> is set, override with the originator's
5004 login (which will get qualified below), except when checking things. */
5006 if ( !sender_address /* No sender_address set */
5008 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5009 !checking)) /* Not running tests, including filter tests */
5011 sender_address = originator_login;
5012 f.sender_address_forced = FALSE;
5013 sender_address_domain = 0;
5017 /* Remember whether an untrusted caller set the sender address */
5019 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5021 /* Ensure that the sender address is fully qualified unless it is the empty
5022 address, which indicates an error message, or doesn't exist (root caller, smtp
5023 interface, no -f argument). */
5025 if (sender_address && *sender_address && sender_address_domain == 0)
5026 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5027 qualify_domain_sender);
5029 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5031 /* Handle a request to verify a list of addresses, or test them for delivery.
5032 This must follow the setting of the sender address, since routers can be
5033 predicated upon the sender. If no arguments are given, read addresses from
5034 stdin. Set debug_level to at least D_v to get full output for address testing.
5037 if (verify_address_mode || f.address_test_mode)
5040 int flags = vopt_qualify;
5042 if (verify_address_mode)
5044 if (!verify_as_sender) flags |= vopt_is_recipient;
5045 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5050 flags |= vopt_is_recipient;
5051 debug_selector |= D_v;
5052 debug_file = stderr;
5053 debug_fd = fileno(debug_file);
5054 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5057 if (recipients_arg < argc)
5058 while (recipients_arg < argc)
5060 /* Supplied addresses are tainted since they come from a user */
5061 uschar * s = string_copy_taint(exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), TRUE);
5064 BOOL finished = FALSE;
5065 uschar *ss = parse_find_address_end(s, FALSE);
5066 if (*ss == ',') *ss = 0; else finished = TRUE;
5067 test_address(s, flags, &exit_value);
5070 while (*++s == ',' || isspace(*s)) ;
5076 uschar * s = get_stdinput(NULL, NULL);
5078 test_address(string_copy_taint(exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), TRUE), flags, &exit_value);
5082 exim_exit(exit_value);
5085 /* Handle expansion checking. Either expand items on the command line, or read
5086 from stdin if there aren't any. If -Mset was specified, load the message so
5087 that its variables can be used, but restrict this facility to admin users.
5088 Otherwise, if -bem was used, read a message from stdin. */
5092 dns_init(FALSE, FALSE, FALSE);
5093 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5097 exim_fail("exim: permission denied\n");
5098 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5099 /* Checking the length of the ID is sufficient to validate it.
5100 Get an untainted version so file opens can be done. */
5101 message_id = string_copy_taint(message_id, FALSE);
5103 spoolname = string_sprintf("%s-H", message_id);
5104 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5105 printf ("Failed to load message datafile %s\n", message_id);
5106 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5107 printf ("Failed to load message %s\n", message_id);
5110 /* Read a test message from a file. We fudge it up to be on stdin, saving
5111 stdin itself for later reading of expansion strings. */
5113 else if (expansion_test_message)
5115 int save_stdin = dup(0);
5116 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5118 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5121 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5122 message_ended = END_NOTENDED;
5123 read_message_body(receive_msg(extract_recipients));
5124 message_linecount += body_linecount;
5125 (void)dup2(save_stdin, 0);
5126 (void)close(save_stdin);
5127 clearerr(stdin); /* Required by Darwin */
5130 /* Only admin users may see config-file macros this way */
5132 if (!f.admin_user) macros_user = macros = mlast = NULL;
5134 /* Allow $recipients for this testing */
5136 f.enable_dollar_recipients = TRUE;
5138 /* Expand command line items */
5140 if (recipients_arg < argc)
5141 while (recipients_arg < argc)
5142 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5148 char *(*fn_readline)(const char *) = NULL;
5149 void (*fn_addhist)(const char *) = NULL;
5153 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5156 while (s = get_stdinput(fn_readline, fn_addhist))
5157 expansion_test_line(s);
5160 if (dlhandle) dlclose(dlhandle);
5164 /* The data file will be open after -Mset */
5166 if (deliver_datafile >= 0)
5168 (void)close(deliver_datafile);
5169 deliver_datafile = -1;
5172 exim_exit(EXIT_SUCCESS);
5176 /* The active host name is normally the primary host name, but it can be varied
5177 for hosts that want to play several parts at once. We need to ensure that it is
5178 set for host checking, and for receiving messages. */
5180 smtp_active_hostname = primary_hostname;
5181 if (raw_active_hostname != NULL)
5183 uschar *nah = expand_string(raw_active_hostname);
5186 if (!f.expand_string_forcedfail)
5187 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5188 "(smtp_active_hostname): %s", raw_active_hostname,
5189 expand_string_message);
5191 else if (nah[0] != 0) smtp_active_hostname = nah;
5194 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5195 given IP address so that the blocking and relay configuration can be tested.
5196 Unless a sender_ident was set by -oMt, we discard it (the default is the
5197 caller's login name). An RFC 1413 call is made only if we are running in the
5198 test harness and an incoming interface and both ports are specified, because
5199 there is no TCP/IP call to find the ident for. */
5206 if (!sender_ident_set)
5208 sender_ident = NULL;
5209 if (f.running_in_test_harness && sender_host_port
5210 && interface_address && interface_port)
5211 verify_get_ident(1223); /* note hardwired port number */
5214 /* In case the given address is a non-canonical IPv6 address, canonicalize
5215 it. The code works for both IPv4 and IPv6, as it happens. */
5217 size = host_aton(sender_host_address, x);
5218 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
5219 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5221 /* Now set up for testing */
5223 host_build_sender_fullhost();
5227 f.sender_local = FALSE;
5228 f.sender_host_notsocket = TRUE;
5229 debug_file = stderr;
5230 debug_fd = fileno(debug_file);
5231 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5232 "**** but without any ident (RFC 1413) callback.\n"
5233 "**** This is not for real!\n\n",
5234 sender_host_address);
5236 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5237 if (verify_check_host(&hosts_connection_nolog) == OK)
5238 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5239 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5241 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5242 because a log line has already been written for all its failure exists
5243 (usually "connection refused: <reason>") and writing another one is
5244 unnecessary clutter. */
5246 if (smtp_start_session())
5249 for (; (reset_point = store_mark()); store_reset(reset_point))
5251 if (smtp_setup_msg() <= 0) break;
5252 if (!receive_msg(FALSE)) break;
5254 return_path = sender_address = NULL;
5255 dnslist_domain = dnslist_matched = NULL;
5256 #ifndef DISABLE_DKIM
5257 dkim_cur_signer = NULL;
5260 deliver_localpart_orig = NULL;
5261 deliver_domain_orig = NULL;
5262 callout_address = sending_ip_address = NULL;
5263 deliver_localpart_data = deliver_domain_data =
5264 recipient_data = sender_data = NULL;
5265 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5269 exim_exit(EXIT_SUCCESS);
5273 /* Arrange for message reception if recipients or SMTP were specified;
5274 otherwise complain unless a version print (-bV) happened or this is a filter
5275 verification test or info dump.
5276 In the former case, show the configuration file name. */
5278 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5280 if (version_printed)
5282 if (Ustrchr(config_main_filelist, ':'))
5283 printf("Configuration file search path is %s\n", config_main_filelist);
5284 printf("Configuration file is %s\n", config_main_filename);
5285 return EXIT_SUCCESS;
5288 if (info_flag != CMDINFO_NONE)
5290 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5291 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5294 if (filter_test == FTEST_NONE)
5295 exim_usage(called_as);
5299 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5300 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5301 that we are not called from inetd, because that is rejected above. The
5302 following configuration settings are forced here:
5304 (1) Synchronous delivery (-odi)
5305 (2) Errors to stderr (-oep == -oeq)
5306 (3) No parallel remote delivery
5307 (4) Unprivileged delivery
5309 We don't force overall queueing options because there are several of them;
5310 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5311 to override any SMTP queueing. */
5315 f.synchronous_delivery = TRUE;
5316 arg_error_handling = ERRORS_STDERR;
5317 remote_max_parallel = 1;
5318 deliver_drop_privilege = TRUE;
5319 f.queue_smtp = FALSE;
5320 queue_smtp_domains = NULL;
5322 message_utf8_downconvert = -1; /* convert-if-needed */
5327 /* Prepare to accept one or more new messages on the standard input. When a
5328 message has been read, its id is returned in message_id[]. If doing immediate
5329 delivery, we fork a delivery process for each received message, except for the
5330 last one, where we can save a process switch.
5332 It is only in non-smtp mode that error_handling is allowed to be changed from
5333 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5334 sendmail error modes other than -oem ever actually used? Later: yes.) */
5336 if (!smtp_input) error_handling = arg_error_handling;
5338 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5339 logging being sent down the socket and make an identd call to get the
5342 else if (f.is_inetd)
5344 (void)fclose(stderr);
5345 exim_nullstd(); /* Re-open to /dev/null */
5346 verify_get_ident(IDENT_PORT);
5347 host_build_sender_fullhost();
5348 set_process_info("handling incoming connection from %s via inetd",
5352 /* If the sender host address has been set, build sender_fullhost if it hasn't
5353 already been done (which it will have been for inetd). This caters for the
5354 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5355 so that the test for IP options is skipped for -bs input. */
5357 if (sender_host_address && !sender_fullhost)
5359 host_build_sender_fullhost();
5360 set_process_info("handling incoming connection from %s via -oMa",
5362 f.sender_host_notsocket = TRUE;
5365 /* Otherwise, set the sender host as unknown except for inetd calls. This
5366 prevents host checking in the case of -bs not from inetd and also for -bS. */
5368 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5370 /* If stdout does not exist, then dup stdin to stdout. This can happen
5371 if exim is started from inetd. In this case fd 0 will be set to the socket,
5372 but fd 1 will not be set. This also happens for passed SMTP channels. */
5374 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5376 /* Set up the incoming protocol name and the state of the program. Root is
5377 allowed to force received protocol via the -oMr option above. If we have come
5378 via inetd, the process info has already been set up. We don't set
5379 received_protocol here for smtp input, as it varies according to
5380 batch/HELO/EHLO/AUTH/TLS. */
5384 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5385 smtp_batched_input? "batched " : "",
5386 (sender_address!= NULL)? sender_address : originator_login);
5390 int old_pool = store_pool;
5391 store_pool = POOL_PERM;
5392 if (!received_protocol)
5393 received_protocol = string_sprintf("local%s", called_as);
5394 store_pool = old_pool;
5395 set_process_info("accepting a local non-SMTP message from <%s>",
5399 /* Initialize the session_local_queue-only flag (this will be ignored if
5400 mua_wrapper is set) */
5403 session_local_queue_only = queue_only;
5405 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5406 the spool if so configured. On failure, we must not attempt to send an error
5407 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5408 error code is given.) */
5410 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5411 exim_fail("exim: insufficient disk space\n");
5413 /* If this is smtp input of any kind, real or batched, handle the start of the
5416 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5417 because a log line has already been written for all its failure exists
5418 (usually "connection refused: <reason>") and writing another one is
5419 unnecessary clutter. */
5425 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5426 if (verify_check_host(&hosts_connection_nolog) == OK)
5427 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5428 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5429 if (!smtp_start_session())
5432 exim_exit(EXIT_SUCCESS);
5436 /* Otherwise, set up the input size limit here. */
5440 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5441 if (expand_string_message)
5442 if (thismessage_size_limit == -1)
5443 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5444 "message_size_limit: %s", expand_string_message);
5446 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5447 "message_size_limit: %s", expand_string_message);
5450 /* Loop for several messages when reading SMTP input. If we fork any child
5451 processes, we don't want to wait for them unless synchronous delivery is
5452 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5453 same as SIG_DFL, despite the fact that documentation often lists the default as
5454 "ignore". This is a confusing area. This is what I know:
5456 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5457 processes that complete simply to go away without ever becoming defunct. You
5458 can't then wait for them - but we don't want to wait for them in the
5459 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5460 happen for all OS (e.g. *BSD is different).
5462 But that's not the end of the story. Some (many? all?) systems have the
5463 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5464 has by default, so it seems that the difference is merely one of default
5465 (compare restarting vs non-restarting signals).
5467 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5468 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5469 of the loop below. Paranoia rules.
5471 February 2003: That's *still* not the end of the story. There are now versions
5472 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5473 process then calls waitpid(), a grumble is written to the system log, because
5474 this is logically inconsistent. In other words, it doesn't like the paranoia.
5475 As a consequence of this, the waitpid() below is now excluded if we are sure
5476 that SIG_IGN works. */
5478 if (!f.synchronous_delivery)
5481 struct sigaction act;
5482 act.sa_handler = SIG_IGN;
5483 sigemptyset(&(act.sa_mask));
5484 act.sa_flags = SA_NOCLDWAIT;
5485 sigaction(SIGCHLD, &act, NULL);
5487 signal(SIGCHLD, SIG_IGN);
5491 /* Save the current store pool point, for resetting at the start of
5492 each message, and save the real sender address, if any. */
5494 real_sender_address = sender_address;
5496 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5497 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5500 for (BOOL more = TRUE; more; )
5502 rmark reset_point = store_mark();
5505 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5506 input and build the recipients list, before calling receive_msg() to read the
5507 message proper. Whatever sender address is given in the SMTP transaction is
5508 often ignored for local senders - we use the actual sender, which is normally
5509 either the underlying user running this process or a -f argument provided by
5510 a trusted caller. It is saved in real_sender_address. The test for whether to
5511 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5516 if ((rc = smtp_setup_msg()) > 0)
5518 if (real_sender_address != NULL &&
5519 !receive_check_set_sender(sender_address))
5521 sender_address = raw_sender = real_sender_address;
5522 sender_address_unrewritten = NULL;
5525 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5526 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5527 the very end. The result of the ACL is ignored (as for other non-SMTP
5528 messages). It is run for its potential side effects. */
5530 if (smtp_batched_input && acl_not_smtp_start != NULL)
5532 uschar *user_msg, *log_msg;
5533 f.enable_dollar_recipients = TRUE;
5534 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5535 &user_msg, &log_msg);
5536 f.enable_dollar_recipients = FALSE;
5539 /* Now get the data for the message */
5541 more = receive_msg(extract_recipients);
5544 cancel_cutthrough_connection(TRUE, US"receive dropped");
5545 if (more) goto MORELOOP;
5546 smtp_log_no_mail(); /* Log no mail if configured */
5547 exim_exit(EXIT_FAILURE);
5552 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5553 smtp_log_no_mail(); /* Log no mail if configured */
5554 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5558 /* In the non-SMTP case, we have all the information from the command
5559 line, but must process it in case it is in the more general RFC822
5560 format, and in any case, to detect syntax errors. Also, it appears that
5561 the use of comma-separated lists as single arguments is common, so we
5562 had better support them. */
5567 int count = argc - recipients_arg;
5568 uschar **list = argv + recipients_arg;
5570 /* These options cannot be changed dynamically for non-SMTP messages */
5572 f.active_local_sender_retain = local_sender_retain;
5573 f.active_local_from_check = local_from_check;
5575 /* Save before any rewriting */
5577 raw_sender = string_copy(sender_address);
5579 /* Loop for each argument (supplied by user hence tainted) */
5581 for (int i = 0; i < count; i++)
5583 int start, end, domain;
5585 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5586 * We'll still want to cap it to something, just in case. */
5587 uschar * s = string_copy_taint(exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), TRUE);
5589 /* Loop for each comma-separated address */
5593 BOOL finished = FALSE;
5595 uschar *ss = parse_find_address_end(s, FALSE);
5597 if (*ss == ',') *ss = 0; else finished = TRUE;
5599 /* Check max recipients - if -t was used, these aren't recipients */
5601 if (recipients_max > 0 && ++rcount > recipients_max &&
5602 !extract_recipients)
5603 if (error_handling == ERRORS_STDERR)
5605 fprintf(stderr, "exim: too many recipients\n");
5606 exim_exit(EXIT_FAILURE);
5610 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5611 errors_sender_rc : EXIT_FAILURE;
5615 BOOL b = allow_utf8_domains;
5616 allow_utf8_domains = TRUE;
5619 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5623 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5624 else allow_utf8_domains = b;
5629 if (domain == 0 && !f.allow_unqualified_recipient)
5632 errmess = US"unqualified recipient address not allowed";
5636 if (error_handling == ERRORS_STDERR)
5638 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5639 string_printing(list[i]), errmess);
5640 exim_exit(EXIT_FAILURE);
5646 eblock.text1 = string_printing(list[i]);
5647 eblock.text2 = errmess;
5649 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5650 errors_sender_rc : EXIT_FAILURE;
5653 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5656 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5660 /* Show the recipients when debugging */
5664 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5665 if (recipients_list)
5667 debug_printf("Recipients:\n");
5668 for (int i = 0; i < recipients_count; i++)
5669 debug_printf(" %s\n", recipients_list[i].address);
5673 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5674 ignored; rejecting here would just add complication, and it can just as
5675 well be done later. Allow $recipients to be visible in the ACL. */
5677 if (acl_not_smtp_start)
5679 uschar *user_msg, *log_msg;
5680 f.enable_dollar_recipients = TRUE;
5681 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5682 &user_msg, &log_msg);
5683 f.enable_dollar_recipients = FALSE;
5686 /* Pause for a while waiting for input. If none received in that time,
5687 close the logfile, if we had one open; then if we wait for a long-running
5688 datasource (months, in one use-case) log rotation will not leave us holding
5691 if (!receive_timeout)
5693 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5696 FD_ZERO(&r); FD_SET(0, &r);
5697 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5700 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5701 will just read the headers for the message, and not write anything onto the
5704 message_ended = END_NOTENDED;
5705 more = receive_msg(extract_recipients);
5707 /* more is always FALSE here (not SMTP message) when reading a message
5708 for real; when reading the headers of a message for filter testing,
5709 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5711 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5712 } /* Non-SMTP message reception */
5714 /* If this is a filter testing run, there are headers in store, but
5715 no message on the spool. Run the filtering code in testing mode, setting
5716 the domain to the qualify domain and the local part to the current user,
5717 unless they have been set by options. The prefix and suffix are left unset
5718 unless specified. The the return path is set to to the sender unless it has
5719 already been set from a return-path header in the message. */
5721 if (filter_test != FTEST_NONE)
5723 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5724 deliver_domain_orig = deliver_domain;
5725 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5726 deliver_localpart_orig = deliver_localpart;
5727 deliver_localpart_prefix = US ftest_prefix;
5728 deliver_localpart_suffix = US ftest_suffix;
5729 deliver_home = originator_home;
5733 printf("Return-path copied from sender\n");
5734 return_path = string_copy(sender_address);
5737 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5738 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5740 receive_add_recipient(
5741 string_sprintf("%s%s%s@%s",
5742 ftest_prefix ? ftest_prefix : US"",
5744 ftest_suffix ? ftest_suffix : US"",
5745 deliver_domain), -1);
5747 printf("Recipient = %s\n", recipients_list[0].address);
5748 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5749 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5751 if (chdir("/")) /* Get away from wherever the user is running this from */
5753 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5754 exim_exit(EXIT_FAILURE);
5757 /* Now we run either a system filter test, or a user filter test, or both.
5758 In the latter case, headers added by the system filter will persist and be
5759 available to the user filter. We need to copy the filter variables
5762 if (filter_test & FTEST_SYSTEM)
5763 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5764 exim_exit(EXIT_FAILURE);
5766 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5768 if (filter_test & FTEST_USER)
5769 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5770 exim_exit(EXIT_FAILURE);
5772 exim_exit(EXIT_SUCCESS);
5775 /* Else act on the result of message reception. We should not get here unless
5776 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5777 will be TRUE. If it is not, check on the number of messages received in this
5780 if ( !session_local_queue_only
5781 && smtp_accept_queue_per_connection > 0
5782 && receive_messagecount > smtp_accept_queue_per_connection)
5784 session_local_queue_only = TRUE;
5785 queue_only_reason = 2;
5788 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5789 and queue_only_load is set, check that the load average is below it. If it is
5790 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5791 default), we put the whole session into queue_only mode. It then remains this
5792 way for any subsequent messages on the same SMTP connection. This is a
5793 deliberate choice; even though the load average may fall, it doesn't seem
5794 right to deliver later messages on the same call when not delivering earlier
5795 ones. However, there are odd cases where this is not wanted, so this can be
5796 changed by setting queue_only_load_latch false. */
5798 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5799 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5801 queue_only_reason = 3;
5802 if (queue_only_load_latch) session_local_queue_only = TRUE;
5805 /* If running as an MUA wrapper, all queueing options and freezing options
5809 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5811 /* Log the queueing here, when it will get a message id attached, but
5812 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5815 if (local_queue_only)
5817 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5818 switch(queue_only_reason)
5821 log_write(L_delay_delivery,
5822 LOG_MAIN, "no immediate delivery: more than %d messages "
5823 "received in one connection", smtp_accept_queue_per_connection);
5827 log_write(L_delay_delivery,
5828 LOG_MAIN, "no immediate delivery: load average %.2f",
5829 (double)load_average/1000.0);
5834 else if (f.queue_only_policy || f.deliver_freeze)
5835 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5837 /* Else do the delivery unless the ACL or local_scan() called for queue only
5838 or froze the message. Always deliver in a separate process. A fork failure is
5839 not a disaster, as the delivery will eventually happen on a subsequent queue
5840 run. The search cache must be tidied before the fork, as the parent will
5841 do it before exiting. The child will trigger a lookup failure and
5842 thereby defer the delivery if it tries to use (for example) a cached ldap
5843 connection that the parent has called unbind on. */
5850 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
5853 close_unwanted(); /* Close unwanted file descriptors and TLS */
5854 exim_nullstd(); /* Ensure std{in,out,err} exist */
5856 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5857 mode, deliver_drop_privilege is forced TRUE). */
5859 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5861 delivery_re_exec(CEE_EXEC_EXIT);
5862 /* Control does not return here. */
5865 /* No need to re-exec */
5867 rc = deliver_message(message_id, FALSE, FALSE);
5869 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5870 ? EXIT_SUCCESS : EXIT_FAILURE);
5875 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5876 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5877 "process: %s", strerror(errno));
5881 release_cutthrough_connection(US"msg passed for delivery");
5883 /* In the parent, wait if synchronous delivery is required. This will
5884 always be the case in MUA wrapper mode. */
5886 if (f.synchronous_delivery)
5889 while (wait(&status) != pid);
5890 if ((status & 0x00ff) != 0)
5891 log_write(0, LOG_MAIN|LOG_PANIC,
5892 "process %d crashed with signal %d while delivering %s",
5893 (int)pid, status & 0x00ff, message_id);
5894 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5899 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5900 automatically reaps children (see comments above the loop), clear away any
5901 finished subprocesses here, in case there are lots of messages coming in
5902 from the same source. */
5904 #ifndef SIG_IGN_WORKS
5905 while (waitpid(-1, NULL, WNOHANG) > 0);
5909 return_path = sender_address = NULL;
5910 authenticated_sender = NULL;
5911 deliver_localpart_orig = NULL;
5912 deliver_domain_orig = NULL;
5913 deliver_host = deliver_host_address = NULL;
5914 dnslist_domain = dnslist_matched = NULL;
5915 #ifdef WITH_CONTENT_SCAN
5916 malware_name = NULL;
5918 callout_address = NULL;
5919 sending_ip_address = NULL;
5920 deliver_localpart_data = deliver_domain_data =
5921 recipient_data = sender_data = NULL;
5923 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5925 store_reset(reset_point);
5928 exim_exit(EXIT_SUCCESS); /* Never returns */
5929 return 0; /* To stop compiler warning */