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;
1648 BOOL one_msg_action = FALSE;
1649 BOOL opt_D_used = FALSE;
1650 BOOL queue_only_set = FALSE;
1651 BOOL receiving_message = TRUE;
1652 BOOL sender_ident_set = FALSE;
1653 BOOL session_local_queue_only;
1655 BOOL removed_privilege = FALSE;
1656 BOOL usage_wanted = FALSE;
1657 BOOL verify_address_mode = FALSE;
1658 BOOL verify_as_sender = FALSE;
1659 BOOL rcpt_verify_quota = FALSE;
1660 BOOL version_printed = FALSE;
1661 uschar *alias_arg = NULL;
1662 uschar *called_as = US"";
1663 uschar *cmdline_syslog_name = NULL;
1664 uschar *start_queue_run_id = NULL;
1665 uschar *stop_queue_run_id = NULL;
1666 uschar *expansion_test_message = NULL;
1667 const uschar *ftest_domain = NULL;
1668 const uschar *ftest_localpart = NULL;
1669 const uschar *ftest_prefix = NULL;
1670 const uschar *ftest_suffix = NULL;
1671 uschar *log_oneline = NULL;
1672 uschar *malware_test_file = NULL;
1673 uschar *real_sender_address;
1674 uschar *originator_home = US"/";
1678 struct stat statbuf;
1679 pid_t passed_qr_pid = (pid_t)0;
1680 int passed_qr_pipe = -1;
1681 gid_t group_list[EXIM_GROUPLIST_SIZE];
1683 /* For the -bI: flag */
1684 enum commandline_info info_flag = CMDINFO_NONE;
1685 BOOL info_stdout = FALSE;
1687 /* Possible options for -R and -S */
1689 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1691 /* Need to define this in case we need to change the environment in order
1692 to get rid of a bogus time zone. We have to make it char rather than uschar
1693 because some OS define it in /usr/include/unistd.h. */
1695 extern char **environ;
1697 #ifdef MEASURE_TIMING
1698 (void)gettimeofday(×tamp_startup, NULL);
1701 store_init(); /* Initialise the memory allocation susbsystem */
1703 /* If the Exim user and/or group and/or the configuration file owner/group were
1704 defined by ref:name at build time, we must now find the actual uid/gid values.
1705 This is a feature to make the lives of binary distributors easier. */
1707 #ifdef EXIM_USERNAME
1708 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1711 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1713 /* If ref:name uses a number as the name, route_finduser() returns
1714 TRUE with exim_uid set and pw coerced to NULL. */
1716 exim_gid = pw->pw_gid;
1717 #ifndef EXIM_GROUPNAME
1720 "exim: ref:name should specify a usercode, not a group.\n"
1721 "exim: can't let you get away with it unless you also specify a group.\n");
1725 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1728 #ifdef EXIM_GROUPNAME
1729 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1730 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1733 #ifdef CONFIGURE_OWNERNAME
1734 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1735 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1736 CONFIGURE_OWNERNAME);
1739 /* We default the system_filter_user to be the Exim run-time user, as a
1740 sane non-root value. */
1741 system_filter_uid = exim_uid;
1743 #ifdef CONFIGURE_GROUPNAME
1744 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1745 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1746 CONFIGURE_GROUPNAME);
1749 /* In the Cygwin environment, some initialization used to need doing.
1750 It was fudged in by means of this macro; now no longer but we'll leave
1751 it in case of others. */
1757 /* Check a field which is patched when we are running Exim within its
1758 testing harness; do a fast initial check, and then the whole thing. */
1760 f.running_in_test_harness =
1761 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1762 if (f.running_in_test_harness)
1765 /* Protect against abusive argv[0] */
1766 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1768 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1769 at the start of a program; however, it seems that some environments do not
1770 follow this. A "strange" locale can affect the formatting of timestamps, so we
1773 setlocale(LC_ALL, "C");
1775 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1777 #ifdef _POSIX_MONOTONIC_CLOCK
1781 /* Set up the default handler for timing using alarm(). */
1783 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1785 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1786 because store_malloc writes a log entry on failure. */
1788 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1789 exim_fail("exim: failed to get store for log buffer\n");
1791 /* Initialize the default log options. */
1793 bits_set(log_selector, log_selector_size, log_default);
1795 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1796 NULL when the daemon is run and the file is closed. We have to use this
1797 indirection, because some systems don't allow writing to the variable "stderr".
1800 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1802 /* Arrange for the PCRE regex library to use our store functions. Note that
1803 the normal calls are actually macros that add additional arguments for
1804 debugging purposes so we have to assign specially constructed functions here.
1805 The default is to use store in the stacking pool, but this is overridden in the
1806 regex_must_compile() function. */
1808 pcre_malloc = function_store_get;
1809 pcre_free = function_dummy_free;
1811 /* Ensure there is a big buffer for temporary use in several places. It is put
1812 in malloc store so that it can be freed for enlargement if necessary. */
1814 big_buffer = store_malloc(big_buffer_size);
1816 /* Set up the handler for the data request signal, and set the initial
1817 descriptive text. */
1819 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1820 set_process_info("initializing");
1821 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1822 signal(SIGSEGV, segv_handler); /* log faults */
1824 /* If running in a dockerized environment, the TERM signal is only
1825 delegated to the PID 1 if we request it by setting an signal handler */
1826 if (getpid() == 1) signal(SIGTERM, term_handler);
1828 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1829 in the daemon code. For the rest of Exim's uses, we ignore it. */
1831 signal(SIGHUP, SIG_IGN);
1833 /* We don't want to die on pipe errors as the code is written to handle
1834 the write error instead. */
1836 signal(SIGPIPE, SIG_IGN);
1838 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1839 set to SIG_IGN. This causes subprocesses that complete before the parent
1840 process waits for them not to hang around, so when Exim calls wait(), nothing
1841 is there. The wait() code has been made robust against this, but let's ensure
1842 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1843 ending status. We use sigaction rather than plain signal() on those OS where
1844 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1845 problem on AIX with this.) */
1849 struct sigaction act;
1850 act.sa_handler = SIG_DFL;
1851 sigemptyset(&(act.sa_mask));
1853 sigaction(SIGCHLD, &act, NULL);
1856 signal(SIGCHLD, SIG_DFL);
1859 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1864 /* Set up the version number. Set up the leading 'E' for the external form of
1865 message ids, set the pointer to the internal form, and initialize it to
1866 indicate no message being processed. */
1869 message_id_option[0] = '-';
1870 message_id_external = message_id_option + 1;
1871 message_id_external[0] = 'E';
1872 message_id = message_id_external + 1;
1875 /* Set the umask to zero so that any files Exim creates using open() are
1876 created with the modes that it specifies. NOTE: Files created with fopen() have
1877 a problem, which was not recognized till rather late (February 2006). With this
1878 umask, such files will be world writeable. (They are all content scanning files
1879 in the spool directory, which isn't world-accessible, so this is not a
1880 disaster, but it's untidy.) I don't want to change this overall setting,
1881 however, because it will interact badly with the open() calls. Instead, there's
1882 now a function called modefopen() that fiddles with the umask while calling
1887 /* Precompile the regular expression for matching a message id. Keep this in
1888 step with the code that generates ids in the accept.c module. We need to do
1889 this here, because the -M options check their arguments for syntactic validity
1890 using mac_ismsgid, which uses this. */
1893 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1895 /* Precompile the regular expression that is used for matching an SMTP error
1896 code, possibly extended, at the start of an error message. Note that the
1897 terminating whitespace character is included. */
1900 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1903 #ifdef WHITELIST_D_MACROS
1904 /* Precompile the regular expression used to filter the content of macros
1905 given to -D for permissibility. */
1907 regex_whitelisted_macro =
1908 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1911 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1913 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1914 this seems to be a generally accepted convention, since one finds symbolic
1915 links called "mailq" in standard OS configurations. */
1917 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1918 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1921 receiving_message = FALSE;
1922 called_as = US"-mailq";
1925 /* If the program is called as "rmail" treat it as equivalent to
1926 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1927 i.e. preventing a single dot on a line from terminating the message, and
1928 returning with zero return code, even in cases of error (provided an error
1929 message has been sent). */
1931 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1932 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1935 called_as = US"-rmail";
1936 errors_sender_rc = EXIT_SUCCESS;
1939 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1940 this is a smail convention. */
1942 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1943 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1945 smtp_input = smtp_batched_input = TRUE;
1946 called_as = US"-rsmtp";
1949 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1950 this is a smail convention. */
1952 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1953 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1956 receiving_message = FALSE;
1957 called_as = US"-runq";
1960 /* If the program is called as "newaliases" treat it as equivalent to
1961 "exim -bi"; this is a sendmail convention. */
1963 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1964 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1967 receiving_message = FALSE;
1968 called_as = US"-newaliases";
1971 /* Save the original effective uid for a couple of uses later. It should
1972 normally be root, but in some esoteric environments it may not be. */
1974 original_euid = geteuid();
1975 original_egid = getegid();
1977 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1978 to be the same as the real ones. This makes a difference only if Exim is setuid
1979 (or setgid) to something other than root, which could be the case in some
1980 special configurations. */
1982 real_uid = getuid();
1983 real_gid = getgid();
1985 if (real_uid == root_uid)
1987 if ((rv = setgid(real_gid)))
1988 exim_fail("exim: setgid(%ld) failed: %s\n",
1989 (long int)real_gid, strerror(errno));
1990 if ((rv = setuid(real_uid)))
1991 exim_fail("exim: setuid(%ld) failed: %s\n",
1992 (long int)real_uid, strerror(errno));
1995 /* If neither the original real uid nor the original euid was root, Exim is
1996 running in an unprivileged state. */
1998 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2000 /* For most of the args-parsing we need to use permanent pool memory */
2002 int old_pool = store_pool;
2003 store_pool = POOL_PERM;
2005 /* Scan the program's arguments. Some can be dealt with right away; others are
2006 simply recorded for checking and handling afterwards. Do a high-level switch
2007 on the second character (the one after '-'), to save some effort. */
2009 for (i = 1; i < argc; i++)
2011 BOOL badarg = FALSE;
2012 uschar * arg = argv[i];
2016 /* An argument not starting with '-' is the start of a recipients list;
2017 break out of the options-scanning loop. */
2025 /* An option consisting of -- terminates the options */
2027 if (Ustrcmp(arg, "--") == 0)
2029 recipients_arg = i + 1;
2033 /* Handle flagged options */
2035 switchchar = arg[1];
2038 /* Make all -ex options synonymous with -oex arguments, since that
2039 is assumed by various callers. Also make -qR options synonymous with -R
2040 options, as that seems to be required as well. Allow for -qqR too, and
2041 the same for -S options. */
2043 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2044 Ustrncmp(arg+1, "qR", 2) == 0 ||
2045 Ustrncmp(arg+1, "qS", 2) == 0)
2047 switchchar = arg[2];
2050 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2052 switchchar = arg[3];
2054 f.queue_2stage = TRUE;
2057 /* Make -r synonymous with -f, since it is a documented alias */
2059 else if (arg[1] == 'r') switchchar = 'f';
2061 /* Make -ov synonymous with -v */
2063 else if (Ustrcmp(arg, "-ov") == 0)
2069 /* deal with --option_aliases */
2070 else if (switchchar == '-')
2072 if (Ustrcmp(argrest, "help") == 0)
2074 usage_wanted = TRUE;
2077 else if (Ustrcmp(argrest, "version") == 0)
2084 /* High-level switch on active initial letter */
2089 /* sendmail uses -Ac and -Am to control which .cf file is used;
2092 if (!*argrest) { badarg = TRUE; break; }
2095 BOOL ignore = FALSE;
2100 if (*(argrest + 1) == '\0')
2104 if (!ignore) badarg = TRUE;
2108 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2109 so has no need of it. */
2112 if (!*argrest) i++; /* Skip over the type */
2118 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2122 /* -bd: Run in daemon mode, awaiting SMTP connections.
2123 -bdf: Ditto, but in the foreground.
2126 f.daemon_listen = TRUE;
2127 if (*argrest == 'f') f.background_daemon = FALSE;
2128 else if (*argrest) badarg = TRUE;
2131 /* -be: Run in expansion test mode
2132 -bem: Ditto, but read a message from a file first
2135 expansion_test = checking = TRUE;
2136 if (*argrest == 'm')
2138 if (++i >= argc) { badarg = TRUE; break; }
2139 expansion_test_message = argv[i];
2142 if (*argrest) badarg = TRUE;
2145 /* -bF: Run system filter test */
2147 filter_test |= checking = FTEST_SYSTEM;
2148 if (*argrest) badarg = TRUE;
2149 else if (++i < argc) filter_test_sfile = argv[i];
2150 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2153 /* -bf: Run user filter test
2154 -bfd: Set domain for filter testing
2155 -bfl: Set local part for filter testing
2156 -bfp: Set prefix for filter testing
2157 -bfs: Set suffix for filter testing
2162 filter_test |= checking = FTEST_USER;
2163 if (++i < argc) filter_test_ufile = argv[i];
2164 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2169 exim_fail("exim: string expected after %s\n", arg);
2170 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2171 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2172 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2173 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2178 /* -bh: Host checking - an IP address must follow. */
2180 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2182 if (++i >= argc) { badarg = TRUE; break; }
2183 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), TRUE);
2184 host_checking = checking = f.log_testing_mode = TRUE;
2185 f.host_checking_callout = *argrest == 'c';
2186 message_logs = FALSE;
2191 /* -bi: This option is used by sendmail to initialize *the* alias file,
2192 though it has the -oA option to specify a different file. Exim has no
2193 concept of *the* alias file, but since Sun's YP make script calls
2194 sendmail this way, some support must be provided. */
2196 if (!*argrest) bi_option = TRUE;
2200 /* -bI: provide information, of the type to follow after a colon.
2201 This is an Exim flag. */
2203 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2205 uschar *p = argrest+1;
2206 info_flag = CMDINFO_HELP;
2208 if (strcmpic(p, CUS"sieve") == 0)
2210 info_flag = CMDINFO_SIEVE;
2213 else if (strcmpic(p, CUS"dscp") == 0)
2215 info_flag = CMDINFO_DSCP;
2218 else if (strcmpic(p, CUS"help") == 0)
2224 /* -bm: Accept and deliver message - the default option. Reinstate
2225 receiving_message, which got turned off for all -b options.
2226 -bmalware: test the filename given for malware */
2228 if (!*argrest) receiving_message = TRUE;
2229 else if (Ustrcmp(argrest, "alware") == 0)
2231 if (++i >= argc) { badarg = TRUE; break; }
2233 malware_test_file = argv[i];
2238 /* -bnq: For locally originating messages, do not qualify unqualified
2239 addresses. In the envelope, this causes errors; in header lines they
2242 if (Ustrcmp(argrest, "q") == 0)
2244 f.allow_unqualified_sender = FALSE;
2245 f.allow_unqualified_recipient = FALSE;
2250 /* -bpxx: List the contents of the mail queue, in various forms. If
2251 the option is -bpc, just a queue count is needed. Otherwise, if the
2252 first letter after p is r, then order is random. */
2254 if (*argrest == 'c')
2257 if (*++argrest) badarg = TRUE;
2261 if (*argrest == 'r')
2263 list_queue_option = 8;
2266 else list_queue_option = 0;
2270 /* -bp: List the contents of the mail queue, top-level only */
2274 /* -bpu: List the contents of the mail queue, top-level undelivered */
2276 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2278 /* -bpa: List the contents of the mail queue, including all delivered */
2280 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2282 /* Unknown after -bp[r] */
2288 /* -bP: List the configuration variables given as the address list.
2289 Force -v, so configuration errors get displayed. */
2292 /* -bP config: we need to setup here, because later,
2293 when list_options is checked, the config is read already */
2296 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2299 readconf_save_config(version_string);
2303 list_options = TRUE;
2304 debug_selector |= D_v;
2305 debug_file = stderr;
2309 /* -brt: Test retry configuration lookup */
2311 if (Ustrcmp(argrest, "t") == 0)
2314 test_retry_arg = i + 1;
2318 /* -brw: Test rewrite configuration */
2320 else if (Ustrcmp(argrest, "w") == 0)
2323 test_rewrite_arg = i + 1;
2329 /* -bS: Read SMTP commands on standard input, but produce no replies -
2330 all errors are reported by sending messages. */
2333 smtp_input = smtp_batched_input = receiving_message = TRUE;
2337 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2338 on standard output. */
2340 if (!*argrest) smtp_input = receiving_message = TRUE;
2344 /* -bt: address testing mode */
2347 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2351 /* -bv: verify addresses */
2354 verify_address_mode = checking = f.log_testing_mode = TRUE;
2356 /* -bvs: verify sender addresses */
2358 else if (Ustrcmp(argrest, "s") == 0)
2360 verify_address_mode = checking = f.log_testing_mode = TRUE;
2361 verify_as_sender = TRUE;
2366 /* -bV: Print version string and support details */
2370 printf("Exim version %s #%s built %s\n", version_string,
2371 version_cnumber, version_date);
2372 printf("%s\n", CS version_copyright);
2373 version_printed = TRUE;
2374 show_whats_supported(stdout);
2375 f.log_testing_mode = TRUE;
2380 /* -bw: inetd wait mode, accept a listening socket as stdin */
2382 f.inetd_wait_mode = TRUE;
2383 f.background_daemon = FALSE;
2384 f.daemon_listen = TRUE;
2386 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2387 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2398 /* -C: change configuration file list; ignore if it isn't really
2399 a change! Enforce a prefix check if required. */
2403 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2404 if (Ustrcmp(config_main_filelist, argrest) != 0)
2406 #ifdef ALT_CONFIG_PREFIX
2408 int len = Ustrlen(ALT_CONFIG_PREFIX);
2409 const uschar *list = argrest;
2411 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2412 while((filename = string_nextinlist(&list, &sep, big_buffer,
2414 if ( ( Ustrlen(filename) < len
2415 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2416 || Ustrstr(filename, "/../") != NULL
2418 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2420 exim_fail("-C Permission denied\n");
2422 if (real_uid != root_uid)
2424 #ifdef TRUSTED_CONFIG_LIST
2426 if (real_uid != exim_uid
2427 #ifdef CONFIGURE_OWNER
2428 && real_uid != config_uid
2431 f.trusted_config = FALSE;
2434 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2437 struct stat statbuf;
2439 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2440 (statbuf.st_uid != root_uid /* owner not root */
2441 #ifdef CONFIGURE_OWNER
2442 && statbuf.st_uid != config_uid /* owner not the special one */
2445 (statbuf.st_gid != root_gid /* group not root */
2446 #ifdef CONFIGURE_GROUP
2447 && statbuf.st_gid != config_gid /* group not the special one */
2449 && (statbuf.st_mode & 020) != 0 /* group writeable */
2451 (statbuf.st_mode & 2) != 0) /* world writeable */
2453 f.trusted_config = FALSE;
2458 /* Well, the trust list at least is up to scratch... */
2460 uschar *trusted_configs[32];
2463 int old_pool = store_pool;
2464 store_pool = POOL_MAIN;
2466 reset_point = store_mark();
2467 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2469 uschar *start = big_buffer, *nl;
2470 while (*start && isspace(*start))
2474 nl = Ustrchr(start, '\n');
2477 trusted_configs[nr_configs++] = string_copy(start);
2478 if (nr_configs == nelem(trusted_configs))
2486 const uschar *list = argrest;
2488 while (f.trusted_config && (filename = string_nextinlist(&list,
2489 &sep, big_buffer, big_buffer_size)))
2491 for (i=0; i < nr_configs; i++)
2492 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2494 if (i == nr_configs)
2496 f.trusted_config = FALSE;
2501 else /* No valid prefixes found in trust_list file. */
2502 f.trusted_config = FALSE;
2503 store_reset(reset_point);
2504 store_pool = old_pool;
2507 else /* Could not open trust_list file. */
2508 f.trusted_config = FALSE;
2511 /* Not root; don't trust config */
2512 f.trusted_config = FALSE;
2516 config_main_filelist = argrest;
2517 f.config_changed = TRUE;
2522 /* -D: set up a macro definition */
2525 #ifdef DISABLE_D_OPTION
2526 exim_fail("exim: -D is not available in this Exim binary\n");
2532 uschar *s = argrest;
2535 while (isspace(*s)) s++;
2537 if (*s < 'A' || *s > 'Z')
2538 exim_fail("exim: macro name set by -D must start with "
2539 "an upper case letter\n");
2541 while (isalnum(*s) || *s == '_')
2543 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2547 if (ptr == 0) { badarg = TRUE; break; }
2548 while (isspace(*s)) s++;
2551 if (*s++ != '=') { badarg = TRUE; break; }
2552 while (isspace(*s)) s++;
2555 for (m = macros_user; m; m = m->next)
2556 if (Ustrcmp(m->name, name) == 0)
2557 exim_fail("exim: duplicated -D in command line\n");
2559 m = macro_create(name, s, TRUE);
2561 if (clmacro_count >= MAX_CLMACROS)
2562 exim_fail("exim: too many -D options on command line\n");
2563 clmacros[clmacro_count++] =
2564 string_sprintf("-D%s=%s", m->name, m->replacement);
2569 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2570 The latter is now a no-op, retained for compatibility only. If -dd is used,
2571 debugging subprocesses of the daemon is disabled. */
2574 if (Ustrcmp(argrest, "ropcr") == 0)
2576 /* drop_cr = TRUE; */
2579 /* Use an intermediate variable so that we don't set debugging while
2580 decoding the debugging bits. */
2584 unsigned int selector = D_default;
2587 if (*argrest == 'd')
2589 f.debug_daemon = TRUE;
2593 decode_bits(&selector, 1, debug_notall, argrest,
2594 debug_options, debug_options_count, US"debug", 0);
2595 debug_selector = selector;
2600 /* -E: This is a local error message. This option is not intended for
2601 external use at all, but is not restricted to trusted callers because it
2602 does no harm (just suppresses certain error messages) and if Exim is run
2603 not setuid root it won't always be trusted when it generates error
2604 messages using this option. If there is a message id following -E, point
2605 message_reference at it, for logging. */
2608 f.local_error_message = TRUE;
2609 if (mac_ismsgid(argrest)) message_reference = argrest;
2613 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2614 option, so it looks as if historically the -oex options are also callable
2615 without the leading -o. So we have to accept them. Before the switch,
2616 anything starting -oe has been converted to -e. Exim does not support all
2617 of the sendmail error options. */
2620 if (Ustrcmp(argrest, "e") == 0)
2622 arg_error_handling = ERRORS_SENDER;
2623 errors_sender_rc = EXIT_SUCCESS;
2625 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2626 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2627 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2628 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2633 /* -F: Set sender's full name, used instead of the gecos entry from
2634 the password file. Since users can usually alter their gecos entries,
2635 there's no security involved in using this instead. The data can follow
2636 the -F or be in the next argument. */
2640 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2641 originator_name = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), TRUE);
2642 f.sender_name_forced = TRUE;
2646 /* -f: Set sender's address - this value is only actually used if Exim is
2647 run by a trusted user, or if untrusted_set_sender is set and matches the
2648 address, except that the null address can always be set by any user. The
2649 test for this happens later, when the value given here is ignored when not
2650 permitted. For an untrusted user, the actual sender is still put in Sender:
2651 if it doesn't match the From: header (unless no_local_from_check is set).
2652 The data can follow the -f or be in the next argument. The -r switch is an
2653 obsolete form of -f but since there appear to be programs out there that
2654 use anything that sendmail has ever supported, better accept it - the
2655 synonymizing is done before the switch above.
2657 At this stage, we must allow domain literal addresses, because we don't
2658 know what the setting of allow_domain_literals is yet. Ditto for trailing
2659 dots and strip_trailing_dot. */
2663 int dummy_start, dummy_end;
2666 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2667 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2669 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2672 uschar * temp = argrest + Ustrlen(argrest) - 1;
2673 while (temp >= argrest && isspace(*temp)) temp--;
2674 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2675 allow_domain_literals = TRUE;
2676 strip_trailing_dot = TRUE;
2678 allow_utf8_domains = TRUE;
2680 if (!(sender_address = parse_extract_address(argrest, &errmess,
2681 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2682 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2684 sender_address = string_copy_taint(sender_address, TRUE);
2686 message_smtputf8 = string_is_utf8(sender_address);
2687 allow_utf8_domains = FALSE;
2689 allow_domain_literals = FALSE;
2690 strip_trailing_dot = FALSE;
2692 f.sender_address_forced = TRUE;
2696 /* -G: sendmail invocation to specify that it's a gateway submission and
2697 sendmail may complain about problems instead of fixing them.
2698 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2699 not at this time complain about problems. */
2705 /* -h: Set the hop count for an incoming message. Exim does not currently
2706 support this; it always computes it by counting the Received: headers.
2707 To put it in will require a change to the spool header file format. */
2711 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2712 if (!isdigit(*argrest)) badarg = TRUE;
2716 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2717 not to be documented for sendmail but mailx (at least) uses it) */
2720 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2724 /* -L: set the identifier used for syslog; equivalent to setting
2725 syslog_processname in the config file, but needs to be an admin option. */
2729 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2730 if ((sz = Ustrlen(argrest)) > 32)
2731 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2733 exim_fail("exim: the -L syslog name is too short\n");
2734 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2738 receiving_message = FALSE;
2740 /* -MC: continue delivery of another message via an existing open
2741 file descriptor. This option is used for an internal call by the
2742 smtp transport when there is a pending message waiting to go to an
2743 address to which it has got a connection. Five subsequent arguments are
2744 required: transport name, host name, IP address, sequence number, and
2745 message_id. Transports may decline to create new processes if the sequence
2746 number gets too big. The channel is stdin. This (-MC) must be the last
2747 argument. There's a subsequent check that the real-uid is privileged.
2749 If we are running in the test harness. delay for a bit, to let the process
2750 that set this one up complete. This makes for repeatability of the logging,
2753 if (Ustrcmp(argrest, "C") == 0)
2755 union sockaddr_46 interface_sock;
2756 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2759 exim_fail("exim: too many or too few arguments after -MC\n");
2761 if (msg_action_arg >= 0)
2762 exim_fail("exim: incompatible arguments\n");
2764 continue_transport = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), TRUE);
2765 continue_hostname = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), TRUE);
2766 continue_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), TRUE);
2767 continue_sequence = Uatoi(argv[++i]);
2768 msg_action = MSG_DELIVER;
2769 msg_action_arg = ++i;
2770 forced_delivery = TRUE;
2771 queue_run_pid = passed_qr_pid;
2772 queue_run_pipe = passed_qr_pipe;
2774 if (!mac_ismsgid(argv[i]))
2775 exim_fail("exim: malformed message id %s after -MC option\n",
2778 /* Set up $sending_ip_address and $sending_port, unless proxied */
2780 if (!continue_proxy_cipher)
2781 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2783 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2786 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2789 testharness_pause_ms(500);
2793 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2797 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2798 precedes -MC (see above). The flag indicates that the host to which
2799 Exim is connected has accepted an AUTH sequence. */
2801 case 'A': f.smtp_authenticated = TRUE; break;
2803 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2804 that exim is connected to supports the esmtp extension DSN */
2806 case 'D': smtp_peer_options |= OPTION_DSN; break;
2808 /* -MCd: for debug, set a process-purpose string */
2810 case 'd': if (++i < argc)
2811 process_purpose = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), TRUE);
2815 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2816 from the commandline should be tainted - but we will need an untainted
2817 value for the spoolfile when doing a -odi delivery process. */
2819 case 'G': if (++i < argc) queue_name = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), FALSE);
2823 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2825 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2827 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2828 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2829 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2831 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2833 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2838 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2839 it preceded -MC (see above) */
2841 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2843 #ifdef SUPPORT_SOCKS
2844 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2845 case 'p': proxy_session = TRUE;
2848 proxy_local_address = string_copy_taint(argv[i], TRUE);
2851 proxy_local_port = Uatoi(argv[i]);
2854 proxy_external_address = string_copy_taint(argv[i], TRUE);
2857 proxy_external_port = Uatoi(argv[i]);
2863 /* -MCQ: pass on the pid of the queue-running process that started
2864 this chain of deliveries and the fd of its synchronizing pipe; this
2865 is useful only when it precedes -MC (see above) */
2867 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2869 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2873 /* -MCq: do a quota check on the given recipient for the given size
2874 of message. Separate from -MC. */
2875 case 'q': rcpt_verify_quota = TRUE;
2876 if (++i < argc) message_size = Uatoi(argv[i]);
2880 /* -MCS: set the smtp_use_size flag; this is useful only when it
2881 precedes -MC (see above) */
2883 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2886 /* -MCs: used with -MCt; SNI was sent */
2887 /* -MCr: ditto, DANE */
2890 case 's': if (++i < argc)
2892 continue_proxy_sni = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), TRUE);
2893 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
2898 /* -MCt: similar to -MCT below but the connection is still open
2899 via a proxy process which handles the TLS context and coding.
2900 Require three arguments for the proxied local address and port,
2901 and the TLS cipher. */
2903 case 't': if (++i < argc)
2904 sending_ip_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), TRUE);
2907 sending_port = (int)(Uatol(argv[i]));
2910 continue_proxy_cipher = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), TRUE);
2914 /* -MCT: set the tls_offered flag; this is useful only when it
2915 precedes -MC (see above). The flag indicates that the host to which
2916 Exim is connected has offered TLS support. */
2918 case 'T': smtp_peer_options |= OPTION_TLS; break;
2921 default: badarg = TRUE; break;
2926 /* -M[x]: various operations on the following list of message ids:
2927 -M deliver the messages, ignoring next retry times and thawing
2928 -Mc deliver the messages, checking next retry times, no thawing
2929 -Mf freeze the messages
2930 -Mg give up on the messages
2931 -Mt thaw the messages
2932 -Mrm remove the messages
2933 In the above cases, this must be the last option. There are also the
2934 following options which are followed by a single message id, and which
2935 act on that message. Some of them use the "recipient" addresses as well.
2936 -Mar add recipient(s)
2937 -MG move to a different queue
2938 -Mmad mark all recipients delivered
2939 -Mmd mark recipients(s) delivered
2941 -Mset load a message for use with -be
2943 -Mvc show copy (of whole message, in RFC 2822 format)
2950 msg_action = MSG_DELIVER;
2951 forced_delivery = f.deliver_force_thaw = TRUE;
2953 else if (Ustrcmp(argrest, "ar") == 0)
2955 msg_action = MSG_ADD_RECIPIENT;
2956 one_msg_action = TRUE;
2958 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2959 else if (Ustrcmp(argrest, "es") == 0)
2961 msg_action = MSG_EDIT_SENDER;
2962 one_msg_action = TRUE;
2964 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2965 else if (Ustrcmp(argrest, "g") == 0)
2967 msg_action = MSG_DELIVER;
2968 deliver_give_up = TRUE;
2970 else if (Ustrcmp(argrest, "G") == 0)
2972 msg_action = MSG_SETQUEUE;
2973 queue_name_dest = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), TRUE);
2975 else if (Ustrcmp(argrest, "mad") == 0)
2977 msg_action = MSG_MARK_ALL_DELIVERED;
2979 else if (Ustrcmp(argrest, "md") == 0)
2981 msg_action = MSG_MARK_DELIVERED;
2982 one_msg_action = TRUE;
2984 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2985 else if (Ustrcmp(argrest, "set") == 0)
2987 msg_action = MSG_LOAD;
2988 one_msg_action = TRUE;
2990 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2991 else if (Ustrcmp(argrest, "vb") == 0)
2993 msg_action = MSG_SHOW_BODY;
2994 one_msg_action = TRUE;
2996 else if (Ustrcmp(argrest, "vc") == 0)
2998 msg_action = MSG_SHOW_COPY;
2999 one_msg_action = TRUE;
3001 else if (Ustrcmp(argrest, "vh") == 0)
3003 msg_action = MSG_SHOW_HEADER;
3004 one_msg_action = TRUE;
3006 else if (Ustrcmp(argrest, "vl") == 0)
3008 msg_action = MSG_SHOW_LOG;
3009 one_msg_action = TRUE;
3011 else { badarg = TRUE; break; }
3013 /* All the -Mxx options require at least one message id. */
3015 msg_action_arg = i + 1;
3016 if (msg_action_arg >= argc)
3017 exim_fail("exim: no message ids given after %s option\n", arg);
3019 /* Some require only message ids to follow */
3021 if (!one_msg_action)
3023 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3024 exim_fail("exim: malformed message id %s after %s option\n",
3026 goto END_ARG; /* Remaining args are ids */
3029 /* Others require only one message id, possibly followed by addresses,
3030 which will be handled as normal arguments. */
3034 if (!mac_ismsgid(argv[msg_action_arg]))
3035 exim_fail("exim: malformed message id %s after %s option\n",
3036 argv[msg_action_arg], arg);
3042 /* Some programs seem to call the -om option without the leading o;
3043 for sendmail it askes for "me too". Exim always does this. */
3046 if (*argrest) badarg = TRUE;
3050 /* -N: don't do delivery - a debugging option that stops transports doing
3051 their thing. It implies debugging at the D_v level. */
3056 f.dont_deliver = TRUE;
3057 debug_selector |= D_v;
3058 debug_file = stderr;
3064 /* -n: This means "don't alias" in sendmail, apparently.
3065 For normal invocations, it has no effect.
3066 It may affect some other options. */
3072 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3073 option to the specified value. This form uses long names. We need to handle
3074 -O option=value and -Ooption=value. */
3079 exim_fail("exim: string expected after -O\n");
3085 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3088 if (!*(alias_arg = argrest))
3089 if (i+1 < argc) alias_arg = argv[++i];
3090 else exim_fail("exim: string expected after -oA\n");
3093 /* -oB: Set a connection message max value for remote deliveries */
3096 uschar * p = argrest;
3098 if (i+1 < argc && isdigit((argv[i+1][0])))
3102 connection_max_messages = 1;
3109 exim_fail("exim: number expected after -oB\n");
3110 connection_max_messages = Uatoi(p);
3115 /* -odb: background delivery */
3118 if (Ustrcmp(argrest, "b") == 0)
3120 f.synchronous_delivery = FALSE;
3121 arg_queue_only = FALSE;
3122 queue_only_set = TRUE;
3125 /* -odd: testsuite-only: add no inter-process delays */
3127 else if (Ustrcmp(argrest, "d") == 0)
3128 f.testsuite_delays = FALSE;
3130 /* -odf: foreground delivery (smail-compatible option); same effect as
3131 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3134 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3136 f.synchronous_delivery = TRUE;
3137 arg_queue_only = FALSE;
3138 queue_only_set = TRUE;
3141 /* -odq: queue only */
3143 else if (Ustrcmp(argrest, "q") == 0)
3145 f.synchronous_delivery = FALSE;
3146 arg_queue_only = TRUE;
3147 queue_only_set = TRUE;
3150 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3151 but no remote delivery */
3153 else if (Ustrcmp(argrest, "qs") == 0)
3155 f.queue_smtp = TRUE;
3156 arg_queue_only = FALSE;
3157 queue_only_set = TRUE;
3162 /* -oex: Sendmail error flags. As these are also accepted without the
3163 leading -o prefix, for compatibility with vacation and other callers,
3164 they are handled with -e above. */
3166 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3167 -oitrue: Another sendmail syntax for the same */
3170 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3175 /* -oM*: Set various characteristics for an incoming message; actually
3176 acted on for trusted callers only. */
3181 exim_fail("exim: data expected after -oM%s\n", argrest);
3183 /* -oMa: Set sender host address */
3185 if (Ustrcmp(argrest, "a") == 0)
3186 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), TRUE);
3188 /* -oMaa: Set authenticator name */
3190 else if (Ustrcmp(argrest, "aa") == 0)
3191 sender_host_authenticated = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), TRUE);
3193 /* -oMas: setting authenticated sender */
3195 else if (Ustrcmp(argrest, "as") == 0)
3196 authenticated_sender = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3198 /* -oMai: setting authenticated id */
3200 else if (Ustrcmp(argrest, "ai") == 0)
3201 authenticated_id = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3203 /* -oMi: Set incoming interface address */
3205 else if (Ustrcmp(argrest, "i") == 0)
3206 interface_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), TRUE);
3208 /* -oMm: Message reference */
3210 else if (Ustrcmp(argrest, "m") == 0)
3212 if (!mac_ismsgid(argv[i+1]))
3213 exim_fail("-oMm must be a valid message ID\n");
3214 if (!f.trusted_config)
3215 exim_fail("-oMm must be called by a trusted user/config\n");
3216 message_reference = argv[++i];
3219 /* -oMr: Received protocol */
3221 else if (Ustrcmp(argrest, "r") == 0)
3223 if (received_protocol)
3224 exim_fail("received_protocol is set already\n");
3226 received_protocol = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), TRUE);
3228 /* -oMs: Set sender host name */
3230 else if (Ustrcmp(argrest, "s") == 0)
3231 sender_host_name = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), TRUE);
3233 /* -oMt: Set sender ident */
3235 else if (Ustrcmp(argrest, "t") == 0)
3237 sender_ident_set = TRUE;
3238 sender_ident = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), TRUE);
3241 /* Else a bad argument */
3248 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3249 seem to call this as -m (undocumented), so that is also accepted (see
3251 /* -oo: An ancient flag for old-style addresses which still seems to
3252 crop up in some calls (see in SCO). */
3256 if (*argrest) badarg = TRUE;
3259 /* -oP <name>: set pid file path for daemon
3260 -oPX: delete pid file of daemon */
3263 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3264 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3265 "(uid=%d euid=%d | %d)\n",
3266 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3267 if (!*argrest) override_pid_file_path = argv[++i];
3268 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3273 /* -or <n>: set timeout for non-SMTP acceptance
3274 -os <n>: set timeout for SMTP acceptance */
3279 int * tp = argrest[-1] == 'r'
3280 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3282 *tp = readconf_readtime(argrest, 0, FALSE);
3283 else if (i+1 < argc)
3284 *tp = readconf_readtime(argv[++i], 0, FALSE);
3287 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3291 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3292 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3295 if (*argrest) badarg = TRUE;
3296 else override_local_interfaces = string_copy_taint(exim_str_fail_toolong(argv[++i], 1024, "-oX"), TRUE);
3299 /* -oY: Override creation of daemon notifier socket */
3302 if (*argrest) badarg = TRUE;
3303 else notifier_socket = NULL;
3306 /* Unknown -o argument */
3314 /* -ps: force Perl startup; -pd force delayed Perl startup */
3318 if (*argrest == 's' && argrest[1] == 0)
3320 perl_start_option = 1;
3323 if (*argrest == 'd' && argrest[1] == 0)
3325 perl_start_option = -1;
3330 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3331 which sets the host protocol and host name */
3334 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3338 uschar * hn = Ustrchr(argrest, ':');
3340 if (received_protocol)
3341 exim_fail("received_protocol is set already\n");
3344 received_protocol = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), TRUE);
3347 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3348 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3349 sender_host_name = string_copy_taint(hn + 1, TRUE);
3356 receiving_message = FALSE;
3357 if (queue_interval >= 0)
3358 exim_fail("exim: -q specified more than once\n");
3360 /* -qq...: Do queue runs in a 2-stage manner */
3362 if (*argrest == 'q')
3364 f.queue_2stage = TRUE;
3368 /* -qi...: Do only first (initial) deliveries */
3370 if (*argrest == 'i')
3372 f.queue_run_first_delivery = TRUE;
3376 /* -qf...: Run the queue, forcing deliveries
3377 -qff..: Ditto, forcing thawing as well */
3379 if (*argrest == 'f')
3381 f.queue_run_force = TRUE;
3382 if (*++argrest == 'f')
3384 f.deliver_force_thaw = TRUE;
3389 /* -q[f][f]l...: Run the queue only on local deliveries */
3391 if (*argrest == 'l')
3393 f.queue_run_local = TRUE;
3397 /* -q[f][f][l][G<name>]... Work on the named queue */
3399 if (*argrest == 'G')
3402 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3403 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3404 queue_name = string_copyn(argrest, i);
3406 if (*argrest == '/') argrest++;
3409 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3410 only, optionally named, optionally starting from a given message id. */
3412 if (!(list_queue || count_queue))
3414 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3417 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3418 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3419 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3420 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3423 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3424 forced, optionally local only, optionally named. */
3426 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3428 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3432 case 'R': /* Synonymous with -qR... */
3434 const uschar *tainted_selectstr;
3436 receiving_message = FALSE;
3438 /* -Rf: As -R (below) but force all deliveries,
3439 -Rff: Ditto, but also thaw all frozen messages,
3440 -Rr: String is regex
3441 -Rrf: Regex and force
3442 -Rrff: Regex and force and thaw
3444 in all cases provided there are no further characters in this
3448 for (int i = 0; i < nelem(rsopts); i++)
3449 if (Ustrcmp(argrest, rsopts[i]) == 0)
3451 if (i != 2) f.queue_run_force = TRUE;
3452 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3453 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3454 argrest += Ustrlen(rsopts[i]);
3457 /* -R: Set string to match in addresses for forced queue run to
3458 pick out particular messages. */
3460 /* Avoid attacks from people providing very long strings, and do so before
3463 tainted_selectstr = argrest;
3464 else if (i+1 < argc)
3465 tainted_selectstr = argv[++i];
3467 exim_fail("exim: string expected after -R\n");
3468 deliver_selectstring = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), TRUE);
3472 /* -r: an obsolete synonym for -f (see above) */
3475 /* -S: Like -R but works on sender. */
3477 case 'S': /* Synonymous with -qS... */
3479 const uschar *tainted_selectstr;
3481 receiving_message = FALSE;
3483 /* -Sf: As -S (below) but force all deliveries,
3484 -Sff: Ditto, but also thaw all frozen messages,
3485 -Sr: String is regex
3486 -Srf: Regex and force
3487 -Srff: Regex and force and thaw
3489 in all cases provided there are no further characters in this
3493 for (int i = 0; i < nelem(rsopts); i++)
3494 if (Ustrcmp(argrest, rsopts[i]) == 0)
3496 if (i != 2) f.queue_run_force = TRUE;
3497 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3498 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3499 argrest += Ustrlen(rsopts[i]);
3502 /* -S: Set string to match in addresses for forced queue run to
3503 pick out particular messages. */
3506 tainted_selectstr = argrest;
3507 else if (i+1 < argc)
3508 tainted_selectstr = argv[++i];
3510 exim_fail("exim: string expected after -S\n");
3511 deliver_selectstring_sender = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), TRUE);
3515 /* -Tqt is an option that is exclusively for use by the testing suite.
3516 It is not recognized in other circumstances. It allows for the setting up
3517 of explicit "queue times" so that various warning/retry things can be
3518 tested. Otherwise variability of clock ticks etc. cause problems. */
3521 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3522 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3527 /* -t: Set flag to extract recipients from body of message. */
3530 if (!*argrest) extract_recipients = TRUE;
3532 /* -ti: Set flag to extract recipients from body of message, and also
3533 specify that dot does not end the message. */
3535 else if (Ustrcmp(argrest, "i") == 0)
3537 extract_recipients = TRUE;
3541 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3544 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3551 /* -U: This means "initial user submission" in sendmail, apparently. The
3552 doc claims that in future sendmail may refuse syntactically invalid
3553 messages instead of fixing them. For the moment, we just ignore it. */
3559 /* -v: verify things - this is a very low-level debugging */
3564 debug_selector |= D_v;
3565 debug_file = stderr;
3571 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3573 The -x flag tells the sendmail command that mail from a local
3574 mail program has National Language Support (NLS) extended characters
3575 in the body of the mail item. The sendmail command can send mail with
3576 extended NLS characters across networks that normally corrupts these
3579 As Exim is 8-bit clean, it just ignores this flag. */
3582 if (*argrest) badarg = TRUE;
3585 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3586 logs to that file. We swallow the parameter and otherwise ignore it. */
3591 exim_fail("exim: string expected after -X\n");
3594 /* -z: a line of text to log */
3599 log_oneline = string_copy_taint(exim_str_fail_toolong(argv[i], 2048, "-z logtext"), TRUE);
3601 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3604 /* All other initial characters are errors */
3609 } /* End of high-level switch statement */
3611 /* Failed to recognize the option, or syntax error */
3614 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3615 "option %s\n", arg);
3619 /* If -R or -S have been specified without -q, assume a single queue run. */
3621 if ( (deliver_selectstring || deliver_selectstring_sender)
3622 && queue_interval < 0)
3627 store_pool = old_pool;
3630 /* If usage_wanted is set we call the usage function - which never returns */
3631 if (usage_wanted) exim_usage(called_as);
3633 /* Arguments have been processed. Check for incompatibilities. */
3634 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3635 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3636 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3637 || filter_test != FTEST_NONE
3638 || msg_action_arg > 0 && !one_msg_action
3640 || ( msg_action_arg > 0
3641 && ( f.daemon_listen || queue_interval > 0 || list_options
3642 || checking && msg_action != MSG_LOAD
3643 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3645 || ( (f.daemon_listen || queue_interval > 0)
3646 && ( sender_address || list_options || list_queue || checking
3649 || f.daemon_listen && queue_interval == 0
3650 || f.inetd_wait_mode && queue_interval >= 0
3652 && ( checking || smtp_input || extract_recipients
3653 || filter_test != FTEST_NONE || bi_option
3655 || ( verify_address_mode
3656 && ( f.address_test_mode || smtp_input || extract_recipients
3657 || filter_test != FTEST_NONE || bi_option
3659 || ( f.address_test_mode
3660 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3664 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3666 || deliver_selectstring && queue_interval < 0
3667 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3669 exim_fail("exim: incompatible command-line options or arguments\n");
3671 /* If debugging is set up, set the file and the file descriptor to pass on to
3672 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3673 to run in the foreground. */
3675 if (debug_selector != 0)
3677 debug_file = stderr;
3678 debug_fd = fileno(debug_file);
3679 f.background_daemon = FALSE;
3680 testharness_pause_ms(100); /* lets caller finish */
3681 if (debug_selector != D_v) /* -v only doesn't show this */
3683 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3684 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3686 if (!version_printed)
3687 show_whats_supported(stderr);
3691 /* When started with root privilege, ensure that the limits on the number of
3692 open files and the number of processes (where that is accessible) are
3693 sufficiently large, or are unset, in case Exim has been called from an
3694 environment where the limits are screwed down. Not all OS have the ability to
3695 change some of these limits. */
3699 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3705 #ifdef RLIMIT_NOFILE
3706 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3708 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3710 rlp.rlim_cur = rlp.rlim_max = 0;
3713 /* I originally chose 1000 as a nice big number that was unlikely to
3714 be exceeded. It turns out that some older OS have a fixed upper limit of
3717 if (rlp.rlim_cur < 1000)
3719 rlp.rlim_cur = rlp.rlim_max = 1000;
3720 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3722 rlp.rlim_cur = rlp.rlim_max = 256;
3723 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3724 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3731 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3733 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3735 rlp.rlim_cur = rlp.rlim_max = 0;
3738 # ifdef RLIM_INFINITY
3739 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3741 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3743 if (rlp.rlim_cur < 1000)
3745 rlp.rlim_cur = rlp.rlim_max = 1000;
3747 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3748 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3754 /* Exim is normally entered as root (but some special configurations are
3755 possible that don't do this). However, it always spins off sub-processes that
3756 set their uid and gid as required for local delivery. We don't want to pass on
3757 any extra groups that root may belong to, so we want to get rid of them all at
3760 We need to obey setgroups() at this stage, before possibly giving up root
3761 privilege for a changed configuration file, but later on we might need to
3762 check on the additional groups for the admin user privilege - can't do that
3763 till after reading the config, which might specify the exim gid. Therefore,
3764 save the group list here first. */
3766 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3767 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3769 /* There is a fundamental difference in some BSD systems in the matter of
3770 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3771 known not to be different. On the "different" systems there is a single group
3772 list, and the first entry in it is the current group. On all other versions of
3773 Unix there is a supplementary group list, which is in *addition* to the current
3774 group. Consequently, to get rid of all extraneous groups on a "standard" system
3775 you pass over 0 groups to setgroups(), while on a "different" system you pass
3776 over a single group - the current group, which is always the first group in the
3777 list. Calling setgroups() with zero groups on a "different" system results in
3778 an error return. The following code should cope with both types of system.
3780 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3781 the "setgroups() with zero groups" - and changes the egid.
3782 Thanks to that we had to stash the original_egid above, for use below
3783 in the call to exim_setugid().
3785 However, if this process isn't running as root, setgroups() can't be used
3786 since you have to be root to run it, even if throwing away groups.
3787 Except, sigh, for Hurd - where you can.
3788 Not being root here happens only in some unusual configurations. */
3791 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3792 && setgroups(0, NULL) != 0
3794 && setgroups(1, group_list) != 0)
3795 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3797 /* If the configuration file name has been altered by an argument on the
3798 command line (either a new file name or a macro definition) and the caller is
3799 not root, or if this is a filter testing run, remove any setuid privilege the
3800 program has and run as the underlying user.
3802 The exim user is locked out of this, which severely restricts the use of -C
3805 Otherwise, set the real ids to the effective values (should be root unless run
3806 from inetd, which it can either be root or the exim uid, if one is configured).
3808 There is a private mechanism for bypassing some of this, in order to make it
3809 possible to test lots of configurations automatically, without having either to
3810 recompile each time, or to patch in an actual configuration file name and other
3811 values (such as the path name). If running in the test harness, pretend that
3812 configuration file changes and macro definitions haven't happened. */
3815 (!f.trusted_config || /* Config changed, or */
3816 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3817 real_uid != root_uid && /* Not root, and */
3818 !f.running_in_test_harness /* Not fudged */
3820 expansion_test /* expansion testing */
3822 filter_test != FTEST_NONE) /* Filter testing */
3824 setgroups(group_count, group_list);
3825 exim_setugid(real_uid, real_gid, FALSE,
3826 US"-C, -D, -be or -bf forces real uid");
3827 removed_privilege = TRUE;
3829 /* In the normal case when Exim is called like this, stderr is available
3830 and should be used for any logging information because attempts to write
3831 to the log will usually fail. To arrange this, we unset really_exim. However,
3832 if no stderr is available there is no point - we might as well have a go
3833 at the log (if it fails, syslog will be written).
3835 Note that if the invoker is Exim, the logs remain available. Messing with
3836 this causes unlogged successful deliveries. */
3838 if (log_stderr && real_uid != exim_uid)
3839 f.really_exim = FALSE;
3842 /* Privilege is to be retained for the moment. It may be dropped later,
3843 depending on the job that this Exim process has been asked to do. For now, set
3844 the real uid to the effective so that subsequent re-execs of Exim are done by a
3848 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3850 /* If testing a filter, open the file(s) now, before wasting time doing other
3851 setups and reading the message. */
3853 if (filter_test & FTEST_SYSTEM)
3854 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3855 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3858 if (filter_test & FTEST_USER)
3859 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3860 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3863 /* Initialise lookup_list
3864 If debugging, already called above via version reporting.
3865 In either case, we initialise the list of available lookups while running
3866 as root. All dynamically modules are loaded from a directory which is
3867 hard-coded into the binary and is code which, if not a module, would be
3868 part of Exim already. Ability to modify the content of the directory
3869 is equivalent to the ability to modify a setuid binary!
3871 This needs to happen before we read the main configuration. */
3874 /*XXX this excrescence could move to the testsuite standard config setup file */
3876 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3879 /* Read the main runtime configuration data; this gives up if there
3880 is a failure. It leaves the configuration file open so that the subsequent
3881 configuration data for delivery can be read if needed.
3883 NOTE: immediately after opening the configuration file we change the working
3884 directory to "/"! Later we change to $spool_directory. We do it there, because
3885 during readconf_main() some expansion takes place already. */
3887 /* Store the initial cwd before we change directories. Can be NULL if the
3888 dir has already been unlinked. */
3889 initial_cwd = os_getcwd(NULL, 0);
3890 if (!initial_cwd && errno)
3891 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
3893 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
3894 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
3897 -be[m] expansion test -
3898 -b[fF] filter test new
3900 -bmalware malware_test_file new
3902 -brw rewrite test new
3904 -bv[s] address verify -
3906 -bP <option> (except -bP config, which sets list_config)
3908 If any of these options is set, we suppress warnings about configuration
3909 issues (currently about tls_advertise_hosts and keep_environment not being
3913 int old_pool = store_pool;
3914 #ifdef MEASURE_TIMING
3915 struct timeval t0, diff;
3916 (void)gettimeofday(&t0, NULL);
3919 store_pool = POOL_CONFIG;
3920 readconf_main(checking || list_options);
3921 store_pool = old_pool;
3923 #ifdef MEASURE_TIMING
3924 report_time_since(&t0, US"readconf_main (delta)");
3928 /* Now in directory "/" */
3930 if (cleanup_environment() == FALSE)
3931 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3934 /* If an action on specific messages is requested, or if a daemon or queue
3935 runner is being started, we need to know if Exim was called by an admin user.
3936 This is the case if the real user is root or exim, or if the real group is
3937 exim, or if one of the supplementary groups is exim or a group listed in
3938 admin_groups. We don't fail all message actions immediately if not admin_user,
3939 since some actions can be performed by non-admin users. Instead, set admin_user
3940 for later interrogation. */
3942 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3943 f.admin_user = TRUE;
3945 for (int i = 0; i < group_count && !f.admin_user; i++)
3946 if (group_list[i] == exim_gid)
3947 f.admin_user = TRUE;
3948 else if (admin_groups)
3949 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3950 if (admin_groups[j] == group_list[i])
3951 f.admin_user = TRUE;
3953 /* Another group of privileged users are the trusted users. These are root,
3954 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3955 are permitted to specify sender_addresses with -f on the command line, and
3956 other message parameters as well. */
3958 if (real_uid == root_uid || real_uid == exim_uid)
3959 f.trusted_caller = TRUE;
3963 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3964 if (trusted_users[i] == real_uid)
3965 f.trusted_caller = TRUE;
3968 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3969 if (trusted_groups[i] == real_gid)
3970 f.trusted_caller = TRUE;
3971 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3972 if (trusted_groups[i] == group_list[j])
3973 f.trusted_caller = TRUE;
3976 /* At this point, we know if the user is privileged and some command-line
3977 options become possibly impermissible, depending upon the configuration file. */
3979 if (checking && commandline_checks_require_admin && !f.admin_user)
3980 exim_fail("exim: those command-line flags are set to require admin\n");
3982 /* Handle the decoding of logging options. */
3984 decode_bits(log_selector, log_selector_size, log_notall,
3985 log_selector_string, log_options, log_options_count, US"log", 0);
3989 debug_printf("configuration file is %s\n", config_main_filename);
3990 debug_printf("log selectors =");
3991 for (int i = 0; i < log_selector_size; i++)
3992 debug_printf(" %08x", log_selector[i]);
3996 /* If domain literals are not allowed, check the sender address that was
3997 supplied with -f. Ditto for a stripped trailing dot. */
4001 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4002 exim_fail("exim: bad -f address \"%s\": domain literals not "
4003 "allowed\n", sender_address);
4004 if (f_end_dot && !strip_trailing_dot)
4005 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4006 "(trailing dot not allowed)\n", sender_address);
4009 /* See if an admin user overrode our logging. */
4011 if (cmdline_syslog_name)
4014 syslog_processname = cmdline_syslog_name;
4015 log_file_path = string_copy(CUS"syslog");
4018 /* not a panic, non-privileged users should not be able to spam paniclog */
4020 "exim: you lack sufficient privilege to specify syslog process name\n");
4022 /* Paranoia check of maximum lengths of certain strings. There is a check
4023 on the length of the log file path in log.c, which will come into effect
4024 if there are any calls to write the log earlier than this. However, if we
4025 get this far but the string is very long, it is better to stop now than to
4026 carry on and (e.g.) receive a message and then have to collapse. The call to
4027 log_write() from here will cause the ultimate panic collapse if the complete
4028 file name exceeds the buffer length. */
4030 if (Ustrlen(log_file_path) > 200)
4031 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4032 "log_file_path is longer than 200 chars: aborting");
4034 if (Ustrlen(pid_file_path) > 200)
4035 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4036 "pid_file_path is longer than 200 chars: aborting");
4038 if (Ustrlen(spool_directory) > 200)
4039 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4040 "spool_directory is longer than 200 chars: aborting");
4042 /* Length check on the process name given to syslog for its TAG field,
4043 which is only permitted to be 32 characters or less. See RFC 3164. */
4045 if (Ustrlen(syslog_processname) > 32)
4046 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4047 "syslog_processname is longer than 32 chars: aborting");
4052 log_write(0, LOG_MAIN, "%s", log_oneline);
4053 return EXIT_SUCCESS;
4056 return EXIT_FAILURE;
4058 /* In some operating systems, the environment variable TMPDIR controls where
4059 temporary files are created; Exim doesn't use these (apart from when delivering
4060 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4061 If TMPDIR is found in the environment, reset it to the value defined in the
4062 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4063 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4064 EXIM_TMPDIR by the build scripts.
4068 if (environ) for (uschar ** p = USS environ; *p; p++)
4069 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4071 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4072 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4074 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4078 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4079 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4080 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4081 called by a user who has set the TZ variable. This then affects the timestamps
4082 in log files and in Received: headers, and any created Date: header lines. The
4083 required timezone is settable in the configuration file, so nothing can be done
4084 about this earlier - but hopefully nothing will normally be logged earlier than
4085 this. We have to make a new environment if TZ is wrong, but don't bother if
4086 timestamps_utc is set, because then all times are in UTC anyway. */
4088 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4089 f.timestamps_utc = TRUE;
4092 uschar *envtz = US getenv("TZ");
4094 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4095 : timezone_string != NULL
4098 uschar **p = USS environ;
4102 if (environ) while (*p++) count++;
4103 if (!envtz) count++;
4104 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4105 if (environ) for (p = USS environ; *p; p++)
4106 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4107 if (timezone_string)
4109 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4110 sprintf(CS *newp++, "TZ=%s", timezone_string);
4115 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4116 tod_stamp(tod_log));
4120 /* Handle the case when we have removed the setuid privilege because of -C or
4121 -D. This means that the caller of Exim was not root.
4123 There is a problem if we were running as the Exim user. The sysadmin may
4124 expect this case to retain privilege because "the binary was called by the
4125 Exim user", but it hasn't, because either the -D option set macros, or the
4126 -C option set a non-trusted configuration file. There are two possibilities:
4128 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4129 to do message deliveries. Thus, the fact that it is running as a
4130 non-privileged user is plausible, and might be wanted in some special
4131 configurations. However, really_exim will have been set false when
4132 privilege was dropped, to stop Exim trying to write to its normal log
4133 files. Therefore, re-enable normal log processing, assuming the sysadmin
4134 has set up the log directory correctly.
4136 (2) If deliver_drop_privilege is not set, the configuration won't work as
4137 apparently intended, and so we log a panic message. In order to retain
4138 root for -C or -D, the caller must either be root or be invoking a
4139 trusted configuration file (when deliver_drop_privilege is false). */
4141 if ( removed_privilege
4142 && (!f.trusted_config || opt_D_used)
4143 && real_uid == exim_uid)
4144 if (deliver_drop_privilege)
4145 f.really_exim = TRUE; /* let logging work normally */
4147 log_write(0, LOG_MAIN|LOG_PANIC,
4148 "exim user lost privilege for using %s option",
4149 f.trusted_config? "-D" : "-C");
4151 /* Start up Perl interpreter if Perl support is configured and there is a
4152 perl_startup option, and the configuration or the command line specifies
4153 initializing starting. Note that the global variables are actually called
4154 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4157 if (perl_start_option != 0)
4158 opt_perl_at_start = (perl_start_option > 0);
4159 if (opt_perl_at_start && opt_perl_startup != NULL)
4162 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4163 if ((errstr = init_perl(opt_perl_startup)))
4164 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4165 opt_perl_started = TRUE;
4167 #endif /* EXIM_PERL */
4169 /* Log the arguments of the call if the configuration file said so. This is
4170 a debugging feature for finding out what arguments certain MUAs actually use.
4171 Don't attempt it if logging is disabled, or if listing variables or if
4172 verifying/testing addresses or expansions. */
4174 if ( (debug_selector & D_any || LOGGING(arguments))
4175 && f.really_exim && !list_options && !checking)
4177 uschar *p = big_buffer;
4178 Ustrcpy(p, US"cwd= (failed)");
4185 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4186 p += Ustrlen(CCS p);
4189 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4191 for (int i = 0; i < argc; i++)
4193 int len = Ustrlen(argv[i]);
4194 const uschar *printing;
4196 if (p + len + 8 >= big_buffer + big_buffer_size)
4198 Ustrcpy(p, US" ...");
4199 log_write(0, LOG_MAIN, "%s", big_buffer);
4200 Ustrcpy(big_buffer, US"...");
4203 printing = string_printing(argv[i]);
4204 if (!*printing) quote = US"\"";
4207 const uschar *pp = printing;
4209 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4211 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4212 (p - big_buffer) - 4), printing, quote);
4215 if (LOGGING(arguments))
4216 log_write(0, LOG_MAIN, "%s", big_buffer);
4218 debug_printf("%s\n", big_buffer);
4221 /* Set the working directory to be the top-level spool directory. We don't rely
4222 on this in the code, which always uses fully qualified names, but it's useful
4223 for core dumps etc. Don't complain if it fails - the spool directory might not
4224 be generally accessible and calls with the -C option (and others) have lost
4225 privilege by now. Before the chdir, we try to ensure that the directory exists.
4228 if (Uchdir(spool_directory) != 0)
4230 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4231 (void) Uchdir(spool_directory);
4234 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4235 alias file. Exim doesn't have such a concept, but this call is screwed into
4236 Sun's YP makefiles. Handle this by calling a configured script, as the real
4237 user who called Exim. The -oA option can be used to pass an argument to the
4242 (void) fclose(config_file);
4243 if (bi_command && *bi_command)
4247 argv[i++] = bi_command;
4248 if (alias_arg) argv[i++] = alias_arg;
4251 setgroups(group_count, group_list);
4252 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4254 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4255 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4257 execv(CS argv[0], (char *const *)argv);
4258 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4262 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4267 /* We moved the admin/trusted check to be immediately after reading the
4268 configuration file. We leave these prints here to ensure that syslog setup,
4269 logfile setup, and so on has already happened. */
4271 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4272 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4274 /* Only an admin user may start the daemon or force a queue run in the default
4275 configuration, but the queue run restriction can be relaxed. Only an admin
4276 user may request that a message be returned to its sender forthwith. Only an
4277 admin user may specify a debug level greater than D_v (because it might show
4278 passwords, etc. in lookup queries). Only an admin user may request a queue
4279 count. Only an admin user can use the test interface to scan for email
4280 (because Exim will be in the spool dir and able to look at mails). */
4284 BOOL debugset = (debug_selector & ~D_v) != 0;
4285 if ( deliver_give_up || f.daemon_listen || malware_test_file
4286 || count_queue && queue_list_requires_admin
4287 || list_queue && queue_list_requires_admin
4288 || queue_interval >= 0 && prod_requires_admin
4289 || queue_name_dest && prod_requires_admin
4290 || debugset && !f.running_in_test_harness
4292 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4295 /* If the real user is not root or the exim uid, the argument for passing
4296 in an open TCP/IP connection for another message is not permitted, nor is
4297 running with the -N option for any delivery action, unless this call to exim is
4298 one that supplied an input message, or we are using a patched exim for
4299 regression testing. */
4301 if ( real_uid != root_uid && real_uid != exim_uid
4302 && ( continue_hostname
4304 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4306 && !f.running_in_test_harness
4308 exim_fail("exim: Permission denied\n");
4310 /* If the caller is not trusted, certain arguments are ignored when running for
4311 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4312 Note that authority for performing certain actions on messages is tested in the
4313 queue_action() function. */
4315 if (!f.trusted_caller && !checking)
4317 sender_host_name = sender_host_address = interface_address =
4318 sender_ident = received_protocol = NULL;
4319 sender_host_port = interface_port = 0;
4320 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4323 /* If a sender host address is set, extract the optional port number off the
4324 end of it and check its syntax. Do the same thing for the interface address.
4325 Exim exits if the syntax is bad. */
4329 if (sender_host_address)
4330 sender_host_port = check_port(sender_host_address);
4331 if (interface_address)
4332 interface_port = check_port(interface_address);
4335 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4338 if (f.trusted_caller)
4340 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4341 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4344 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4347 /* If an SMTP message is being received check to see if the standard input is a
4348 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4349 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4354 union sockaddr_46 inetd_sock;
4355 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4356 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4358 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4359 if (family == AF_INET || family == AF_INET6)
4361 union sockaddr_46 interface_sock;
4362 size = sizeof(interface_sock);
4364 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4365 interface_address = host_ntoa(-1, &interface_sock, NULL,
4368 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4370 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4373 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4374 NULL, &sender_host_port);
4375 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4376 "inetd is not supported when mua_wrapper is set");
4380 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4385 /* If the load average is going to be needed while receiving a message, get it
4386 now for those OS that require the first call to os_getloadavg() to be done as
4387 root. There will be further calls later for each message received. */
4389 #ifdef LOAD_AVG_NEEDS_ROOT
4390 if ( receiving_message
4391 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4392 load_average = OS_GETLOADAVG();
4395 /* The queue_only configuration option can be overridden by -odx on the command
4396 line, except that if queue_only_override is false, queue_only cannot be unset
4397 from the command line. */
4399 if (queue_only_set && (queue_only_override || arg_queue_only))
4400 queue_only = arg_queue_only;
4402 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4405 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4406 if (arg_smtp_receive_timeout >= 0)
4407 smtp_receive_timeout = arg_smtp_receive_timeout;
4409 /* If Exim was started with root privilege, unless we have already removed the
4410 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4411 except when starting the daemon or doing some kind of delivery or address
4412 testing (-bt). These are the only cases when root need to be retained. We run
4413 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4414 retained only for starting the daemon. We always do the initgroups() in this
4415 situation (controlled by the TRUE below), in order to be as close as possible
4416 to the state Exim usually runs in. */
4418 if ( !unprivileged /* originally had root AND */
4419 && !removed_privilege /* still got root AND */
4420 && !f.daemon_listen /* not starting the daemon */
4421 && queue_interval <= 0 /* (either kind of daemon) */
4422 && ( /* AND EITHER */
4423 deliver_drop_privilege /* requested unprivileged */
4425 queue_interval < 0 /* not running the queue */
4426 && ( msg_action_arg < 0 /* and */
4427 || msg_action != MSG_DELIVER /* not delivering */
4429 && (!checking || !f.address_test_mode) /* not address checking */
4430 && !rcpt_verify_quota /* and not quota checking */
4432 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4434 /* When we are retaining a privileged uid, we still change to the exim gid. */
4439 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4440 rv = setgid(exim_gid);
4441 /* Impact of failure is that some stuff might end up with an incorrect group.
4442 We track this for failures from root, since any attempt to change privilege
4443 by root should succeed and failures should be examined. For non-root,
4444 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4445 no need to complain then. */
4447 if (!(unprivileged || removed_privilege))
4448 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4451 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4452 (long int)exim_gid, strerror(errno));
4456 /* Handle a request to scan a file for malware */
4457 if (malware_test_file)
4459 #ifdef WITH_CONTENT_SCAN
4461 set_process_info("scanning file for malware");
4462 if ((result = malware_in_file(malware_test_file)) == FAIL)
4464 printf("No malware found.\n");
4469 printf("Malware lookup returned non-okay/fail: %d\n", result);
4473 printf("Malware found: %s\n", malware_name);
4475 printf("Malware scan detected malware of unknown name.\n");
4477 printf("Malware scanning not enabled at compile time.\n");
4482 /* Handle a request to list the delivery queue */
4486 set_process_info("listing the queue");
4487 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4491 /* Handle a request to count the delivery queue */
4495 set_process_info("counting the queue");
4496 fprintf(stdout, "%u\n", queue_count());
4500 /* Handle actions on specific messages, except for the force delivery and
4501 message load actions, which are done below. Some actions take a whole list of
4502 message ids, which are known to continue up to the end of the arguments. Others
4503 take a single message id and then operate on the recipients list. */
4505 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4507 int yield = EXIT_SUCCESS;
4508 set_process_info("acting on specified messages");
4510 /* ACL definitions may be needed when removing a message (-Mrm) because
4511 event_action gets expanded */
4513 if (msg_action == MSG_REMOVE)
4515 int old_pool = store_pool;
4516 store_pool = POOL_CONFIG;
4518 store_pool = old_pool;
4519 store_writeprotect(POOL_CONFIG);
4522 if (!one_msg_action)
4524 for (i = msg_action_arg; i < argc; i++)
4525 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4526 yield = EXIT_FAILURE;
4529 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4530 default: printf("\n"); break;
4534 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4535 recipients_arg)) yield = EXIT_FAILURE;
4539 /* We used to set up here to skip reading the ACL section, on
4540 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4541 Now, since the intro of the ${acl } expansion, ACL definitions may be
4542 needed in transports so we lost the optimisation. */
4545 int old_pool = store_pool;
4546 #ifdef MEASURE_TIMING
4547 struct timeval t0, diff;
4548 (void)gettimeofday(&t0, NULL);
4551 store_pool = POOL_CONFIG;
4553 store_pool = old_pool;
4554 store_writeprotect(POOL_CONFIG);
4556 #ifdef MEASURE_TIMING
4557 report_time_since(&t0, US"readconf_rest (delta)");
4561 /* Handle a request to check quota */
4562 if (rcpt_verify_quota)
4563 if (real_uid != root_uid && real_uid != exim_uid)
4564 exim_fail("exim: Permission denied\n");
4565 else if (recipients_arg >= argc)
4566 exim_fail("exim: missing recipient for quota check\n");
4569 verify_quota(argv[recipients_arg]);
4570 exim_exit(EXIT_SUCCESS);
4573 /* Handle the -brt option. This is for checking out retry configurations.
4574 The next three arguments are a domain name or a complete address, and
4575 optionally two error numbers. All it does is to call the function that
4576 scans the retry configuration data. */
4578 if (test_retry_arg >= 0)
4580 retry_config *yield;
4581 int basic_errno = 0;
4583 const uschar *s1, *s2;
4585 if (test_retry_arg >= argc)
4587 printf("-brt needs a domain or address argument\n");
4588 exim_exit(EXIT_FAILURE);
4590 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4593 /* If the first argument contains no @ and no . it might be a local user
4594 or it might be a single-component name. Treat as a domain. */
4596 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4598 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4599 "being \ntreated as a one-component domain, not as a local part.\n\n",
4603 /* There may be an optional second domain arg. */
4605 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4606 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4608 /* The final arg is an error name */
4610 if (test_retry_arg < argc)
4612 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4614 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4617 printf("%s\n", CS error);
4618 return EXIT_FAILURE;
4621 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4622 code > 100 as an error is for matching codes to the decade. Turn them into
4623 a real error code, off the decade. */
4625 if (basic_errno == ERRNO_MAIL4XX ||
4626 basic_errno == ERRNO_RCPT4XX ||
4627 basic_errno == ERRNO_DATA4XX)
4629 int code = (more_errno >> 8) & 255;
4631 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4632 else if (code > 100)
4633 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4637 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4638 printf("No retry information found\n");
4641 more_errno = yield->more_errno;
4642 printf("Retry rule: %s ", yield->pattern);
4644 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4646 printf("quota%s%s ",
4647 (more_errno > 0)? "_" : "",
4648 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4650 else if (yield->basic_errno == ECONNREFUSED)
4652 printf("refused%s%s ",
4653 (more_errno > 0)? "_" : "",
4654 (more_errno == 'M')? "MX" :
4655 (more_errno == 'A')? "A" : "");
4657 else if (yield->basic_errno == ETIMEDOUT)
4660 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4662 if (more_errno != 0) printf("_%s",
4663 (more_errno == 'M')? "MX" : "A");
4666 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4667 printf("auth_failed ");
4670 for (retry_rule * r = yield->rules; r; r = r->next)
4672 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4673 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4679 printf(",%d.", x/1000);
4693 exim_exit(EXIT_SUCCESS);
4696 /* Handle a request to list one or more configuration options */
4697 /* If -n was set, we suppress some information */
4702 set_process_info("listing variables");
4703 if (recipients_arg >= argc)
4704 fail = !readconf_print(US"all", NULL, flag_n);
4705 else for (i = recipients_arg; i < argc; i++)
4708 (Ustrcmp(argv[i], "router") == 0 ||
4709 Ustrcmp(argv[i], "transport") == 0 ||
4710 Ustrcmp(argv[i], "authenticator") == 0 ||
4711 Ustrcmp(argv[i], "macro") == 0 ||
4712 Ustrcmp(argv[i], "environment") == 0))
4714 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4718 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4720 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4725 set_process_info("listing config");
4726 exim_exit(readconf_print(US"config", NULL, flag_n)
4727 ? EXIT_SUCCESS : EXIT_FAILURE);
4731 /* Initialise subsystems as required. */
4735 /* Handle a request to deliver one or more messages that are already on the
4736 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4737 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4739 Delivery of specific messages is typically used for a small number when
4740 prodding by hand (when the option forced_delivery will be set) or when
4741 re-execing to regain root privilege. Each message delivery must happen in a
4742 separate process, so we fork a process for each one, and run them sequentially
4743 so that debugging output doesn't get intertwined, and to avoid spawning too
4744 many processes if a long list is given. However, don't fork for the last one;
4745 this saves a process in the common case when Exim is called to deliver just one
4748 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4750 if (prod_requires_admin && !f.admin_user)
4752 fprintf(stderr, "exim: Permission denied\n");
4753 exim_exit(EXIT_FAILURE);
4755 set_process_info("delivering specified messages");
4756 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4757 for (i = msg_action_arg; i < argc; i++)
4761 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4762 that runs into a later copy into the untainted global message_id[] */
4763 /*XXX Do we need a length limit check here? */
4765 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4766 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4768 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4769 exim_underbar_exit(EXIT_SUCCESS);
4773 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4775 exim_exit(EXIT_FAILURE);
4779 exim_exit(EXIT_SUCCESS);
4783 /* If only a single queue run is requested, without SMTP listening, we can just
4784 turn into a queue runner, with an optional starting message id. */
4786 if (queue_interval == 0 && !f.daemon_listen)
4788 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4789 start_queue_run_id ? US" starting at " : US"",
4790 start_queue_run_id ? start_queue_run_id: US"",
4791 stop_queue_run_id ? US" stopping at " : US"",
4792 stop_queue_run_id ? stop_queue_run_id : US"");
4794 set_process_info("running the '%s' queue (single queue run)", queue_name);
4796 set_process_info("running the queue (single queue run)");
4797 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4798 exim_exit(EXIT_SUCCESS);
4802 /* Find the login name of the real user running this process. This is always
4803 needed when receiving a message, because it is written into the spool file. It
4804 may also be used to construct a from: or a sender: header, and in this case we
4805 need the user's full name as well, so save a copy of it, checked for RFC822
4806 syntax and munged if necessary, if it hasn't previously been set by the -F
4807 argument. We may try to get the passwd entry more than once, in case NIS or
4808 other delays are in evidence. Save the home directory for use in filter testing
4813 if ((pw = getpwuid(real_uid)) != NULL)
4815 originator_login = string_copy(US pw->pw_name);
4816 originator_home = string_copy(US pw->pw_dir);
4818 /* If user name has not been set by -F, set it from the passwd entry
4819 unless -f has been used to set the sender address by a trusted user. */
4821 if (!originator_name)
4823 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4825 uschar *name = US pw->pw_gecos;
4826 uschar *amp = Ustrchr(name, '&');
4829 /* Most Unix specify that a '&' character in the gecos field is
4830 replaced by a copy of the login name, and some even specify that
4831 the first character should be upper cased, so that's what we do. */
4836 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4837 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4838 buffer[loffset] = toupper(buffer[loffset]);
4842 /* If a pattern for matching the gecos field was supplied, apply
4843 it and then expand the name string. */
4845 if (gecos_pattern && gecos_name)
4848 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4850 if (regex_match_and_setup(re, name, 0, -1))
4852 uschar *new_name = expand_string(gecos_name);
4856 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4857 "gecos field \"%s\"\n", new_name, name);
4860 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4861 "\"%s\": %s\n", gecos_name, expand_string_message);
4863 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4864 "gecos field \"%s\"\n", gecos_pattern, name);
4865 store_free((void *)re);
4867 originator_name = string_copy(name);
4870 /* A trusted caller has used -f but not -F */
4872 else originator_name = US"";
4875 /* Break the retry loop */
4880 if (++i > finduser_retries) break;
4884 /* If we cannot get a user login, log the incident and give up, unless the
4885 configuration specifies something to use. When running in the test harness,
4886 any setting of unknown_login overrides the actual name. */
4888 if (!originator_login || f.running_in_test_harness)
4892 originator_login = expand_string(unknown_login);
4893 if (!originator_name && unknown_username)
4894 originator_name = expand_string(unknown_username);
4895 if (!originator_name) originator_name = US"";
4897 if (!originator_login)
4898 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4902 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4905 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
4907 /* If a message is created by this call of Exim, the uid/gid of its originator
4908 are those of the caller. These values are overridden if an existing message is
4909 read in from the spool. */
4911 originator_uid = real_uid;
4912 originator_gid = real_gid;
4914 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4915 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4917 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4918 returns. We leave this till here so that the originator_ fields are available
4919 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4922 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4926 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4927 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4928 "mua_wrapper is set");
4931 # ifndef DISABLE_TLS
4932 /* This also checks that the library linkage is working and we can call
4933 routines in it, so call even if tls_require_ciphers is unset */
4935 # ifdef MEASURE_TIMING
4936 struct timeval t0, diff;
4937 (void)gettimeofday(&t0, NULL);
4939 if (!tls_dropprivs_validate_require_cipher(FALSE))
4941 # ifdef MEASURE_TIMING
4942 report_time_since(&t0, US"validate_ciphers (delta)");
4950 /* If the sender ident has not been set (by a trusted caller) set it to
4951 the caller. This will get overwritten below for an inetd call. If a trusted
4952 caller has set it empty, unset it. */
4954 if (!sender_ident) sender_ident = originator_login;
4955 else if (!*sender_ident) sender_ident = NULL;
4957 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4958 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4959 originator_* variables set. */
4961 if (test_rewrite_arg >= 0)
4963 f.really_exim = FALSE;
4964 if (test_rewrite_arg >= argc)
4966 printf("-brw needs an address argument\n");
4967 exim_exit(EXIT_FAILURE);
4969 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
4970 exim_exit(EXIT_SUCCESS);
4973 /* A locally-supplied message is considered to be coming from a local user
4974 unless a trusted caller supplies a sender address with -f, or is passing in the
4975 message via SMTP (inetd invocation or otherwise). */
4977 if ( !sender_address && !smtp_input
4978 || !f.trusted_caller && filter_test == FTEST_NONE)
4980 f.sender_local = TRUE;
4982 /* A trusted caller can supply authenticated_sender and authenticated_id
4983 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4984 defaults except when host checking. */
4986 if (!authenticated_sender && !host_checking)
4987 authenticated_sender = string_sprintf("%s@%s", originator_login,
4988 qualify_domain_sender);
4989 if (!authenticated_id && !host_checking)
4990 authenticated_id = originator_login;
4993 /* Trusted callers are always permitted to specify the sender address.
4994 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4995 is specified is the empty address. However, if a trusted caller does not
4996 specify a sender address for SMTP input, we leave sender_address unset. This
4997 causes the MAIL commands to be honoured. */
4999 if ( !smtp_input && !sender_address
5000 || !receive_check_set_sender(sender_address))
5002 /* Either the caller is not permitted to set a general sender, or this is
5003 non-SMTP input and the trusted caller has not set a sender. If there is no
5004 sender, or if a sender other than <> is set, override with the originator's
5005 login (which will get qualified below), except when checking things. */
5007 if ( !sender_address /* No sender_address set */
5009 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5010 !checking)) /* Not running tests, including filter tests */
5012 sender_address = originator_login;
5013 f.sender_address_forced = FALSE;
5014 sender_address_domain = 0;
5018 /* Remember whether an untrusted caller set the sender address */
5020 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5022 /* Ensure that the sender address is fully qualified unless it is the empty
5023 address, which indicates an error message, or doesn't exist (root caller, smtp
5024 interface, no -f argument). */
5026 if (sender_address && *sender_address && sender_address_domain == 0)
5027 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5028 qualify_domain_sender);
5030 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5032 /* Handle a request to verify a list of addresses, or test them for delivery.
5033 This must follow the setting of the sender address, since routers can be
5034 predicated upon the sender. If no arguments are given, read addresses from
5035 stdin. Set debug_level to at least D_v to get full output for address testing.
5038 if (verify_address_mode || f.address_test_mode)
5041 int flags = vopt_qualify;
5043 if (verify_address_mode)
5045 if (!verify_as_sender) flags |= vopt_is_recipient;
5046 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5051 flags |= vopt_is_recipient;
5052 debug_selector |= D_v;
5053 debug_file = stderr;
5054 debug_fd = fileno(debug_file);
5055 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5058 if (recipients_arg < argc)
5059 while (recipients_arg < argc)
5061 /* Supplied addresses are tainted since they come from a user */
5062 uschar * s = string_copy_taint(exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), TRUE);
5065 BOOL finished = FALSE;
5066 uschar *ss = parse_find_address_end(s, FALSE);
5067 if (*ss == ',') *ss = 0; else finished = TRUE;
5068 test_address(s, flags, &exit_value);
5071 while (*++s == ',' || isspace(*s)) ;
5077 uschar * s = get_stdinput(NULL, NULL);
5079 test_address(string_copy_taint(exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), TRUE), flags, &exit_value);
5083 exim_exit(exit_value);
5086 /* Handle expansion checking. Either expand items on the command line, or read
5087 from stdin if there aren't any. If -Mset was specified, load the message so
5088 that its variables can be used, but restrict this facility to admin users.
5089 Otherwise, if -bem was used, read a message from stdin. */
5093 dns_init(FALSE, FALSE, FALSE);
5094 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5098 exim_fail("exim: permission denied\n");
5099 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5100 /* Checking the length of the ID is sufficient to validate it.
5101 Get an untainted version so file opens can be done. */
5102 message_id = string_copy_taint(message_id, FALSE);
5104 spoolname = string_sprintf("%s-H", message_id);
5105 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5106 printf ("Failed to load message datafile %s\n", message_id);
5107 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5108 printf ("Failed to load message %s\n", message_id);
5111 /* Read a test message from a file. We fudge it up to be on stdin, saving
5112 stdin itself for later reading of expansion strings. */
5114 else if (expansion_test_message)
5116 int save_stdin = dup(0);
5117 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5119 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5122 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5123 message_ended = END_NOTENDED;
5124 read_message_body(receive_msg(extract_recipients));
5125 message_linecount += body_linecount;
5126 (void)dup2(save_stdin, 0);
5127 (void)close(save_stdin);
5128 clearerr(stdin); /* Required by Darwin */
5131 /* Only admin users may see config-file macros this way */
5133 if (!f.admin_user) macros_user = macros = mlast = NULL;
5135 /* Allow $recipients for this testing */
5137 f.enable_dollar_recipients = TRUE;
5139 /* Expand command line items */
5141 if (recipients_arg < argc)
5142 while (recipients_arg < argc)
5143 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5149 char *(*fn_readline)(const char *) = NULL;
5150 void (*fn_addhist)(const char *) = NULL;
5154 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5157 while (s = get_stdinput(fn_readline, fn_addhist))
5158 expansion_test_line(s);
5161 if (dlhandle) dlclose(dlhandle);
5165 /* The data file will be open after -Mset */
5167 if (deliver_datafile >= 0)
5169 (void)close(deliver_datafile);
5170 deliver_datafile = -1;
5173 exim_exit(EXIT_SUCCESS);
5177 /* The active host name is normally the primary host name, but it can be varied
5178 for hosts that want to play several parts at once. We need to ensure that it is
5179 set for host checking, and for receiving messages. */
5181 smtp_active_hostname = primary_hostname;
5182 if (raw_active_hostname != NULL)
5184 uschar *nah = expand_string(raw_active_hostname);
5187 if (!f.expand_string_forcedfail)
5188 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5189 "(smtp_active_hostname): %s", raw_active_hostname,
5190 expand_string_message);
5192 else if (nah[0] != 0) smtp_active_hostname = nah;
5195 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5196 given IP address so that the blocking and relay configuration can be tested.
5197 Unless a sender_ident was set by -oMt, we discard it (the default is the
5198 caller's login name). An RFC 1413 call is made only if we are running in the
5199 test harness and an incoming interface and both ports are specified, because
5200 there is no TCP/IP call to find the ident for. */
5207 if (!sender_ident_set)
5209 sender_ident = NULL;
5210 if (f.running_in_test_harness && sender_host_port
5211 && interface_address && interface_port)
5212 verify_get_ident(1223); /* note hardwired port number */
5215 /* In case the given address is a non-canonical IPv6 address, canonicalize
5216 it. The code works for both IPv4 and IPv6, as it happens. */
5218 size = host_aton(sender_host_address, x);
5219 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
5220 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5222 /* Now set up for testing */
5224 host_build_sender_fullhost();
5228 f.sender_local = FALSE;
5229 f.sender_host_notsocket = TRUE;
5230 debug_file = stderr;
5231 debug_fd = fileno(debug_file);
5232 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5233 "**** but without any ident (RFC 1413) callback.\n"
5234 "**** This is not for real!\n\n",
5235 sender_host_address);
5237 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5238 if (verify_check_host(&hosts_connection_nolog) == OK)
5239 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5240 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5242 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5243 because a log line has already been written for all its failure exists
5244 (usually "connection refused: <reason>") and writing another one is
5245 unnecessary clutter. */
5247 if (smtp_start_session())
5250 for (; (reset_point = store_mark()); store_reset(reset_point))
5252 if (smtp_setup_msg() <= 0) break;
5253 if (!receive_msg(FALSE)) break;
5255 return_path = sender_address = NULL;
5256 dnslist_domain = dnslist_matched = NULL;
5257 #ifndef DISABLE_DKIM
5258 dkim_cur_signer = NULL;
5261 deliver_localpart_orig = NULL;
5262 deliver_domain_orig = NULL;
5263 callout_address = sending_ip_address = NULL;
5264 deliver_localpart_data = deliver_domain_data =
5265 recipient_data = sender_data = NULL;
5266 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5270 exim_exit(EXIT_SUCCESS);
5274 /* Arrange for message reception if recipients or SMTP were specified;
5275 otherwise complain unless a version print (-bV) happened or this is a filter
5276 verification test or info dump.
5277 In the former case, show the configuration file name. */
5279 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5281 if (version_printed)
5283 if (Ustrchr(config_main_filelist, ':'))
5284 printf("Configuration file search path is %s\n", config_main_filelist);
5285 printf("Configuration file is %s\n", config_main_filename);
5286 return EXIT_SUCCESS;
5289 if (info_flag != CMDINFO_NONE)
5291 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5292 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5295 if (filter_test == FTEST_NONE)
5296 exim_usage(called_as);
5300 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5301 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5302 that we are not called from inetd, because that is rejected above. The
5303 following configuration settings are forced here:
5305 (1) Synchronous delivery (-odi)
5306 (2) Errors to stderr (-oep == -oeq)
5307 (3) No parallel remote delivery
5308 (4) Unprivileged delivery
5310 We don't force overall queueing options because there are several of them;
5311 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5312 to override any SMTP queueing. */
5316 f.synchronous_delivery = TRUE;
5317 arg_error_handling = ERRORS_STDERR;
5318 remote_max_parallel = 1;
5319 deliver_drop_privilege = TRUE;
5320 f.queue_smtp = FALSE;
5321 queue_smtp_domains = NULL;
5323 message_utf8_downconvert = -1; /* convert-if-needed */
5328 /* Prepare to accept one or more new messages on the standard input. When a
5329 message has been read, its id is returned in message_id[]. If doing immediate
5330 delivery, we fork a delivery process for each received message, except for the
5331 last one, where we can save a process switch.
5333 It is only in non-smtp mode that error_handling is allowed to be changed from
5334 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5335 sendmail error modes other than -oem ever actually used? Later: yes.) */
5337 if (!smtp_input) error_handling = arg_error_handling;
5339 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5340 logging being sent down the socket and make an identd call to get the
5343 else if (f.is_inetd)
5345 (void)fclose(stderr);
5346 exim_nullstd(); /* Re-open to /dev/null */
5347 verify_get_ident(IDENT_PORT);
5348 host_build_sender_fullhost();
5349 set_process_info("handling incoming connection from %s via inetd",
5353 /* If the sender host address has been set, build sender_fullhost if it hasn't
5354 already been done (which it will have been for inetd). This caters for the
5355 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5356 so that the test for IP options is skipped for -bs input. */
5358 if (sender_host_address && !sender_fullhost)
5360 host_build_sender_fullhost();
5361 set_process_info("handling incoming connection from %s via -oMa",
5363 f.sender_host_notsocket = TRUE;
5366 /* Otherwise, set the sender host as unknown except for inetd calls. This
5367 prevents host checking in the case of -bs not from inetd and also for -bS. */
5369 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5371 /* If stdout does not exist, then dup stdin to stdout. This can happen
5372 if exim is started from inetd. In this case fd 0 will be set to the socket,
5373 but fd 1 will not be set. This also happens for passed SMTP channels. */
5375 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5377 /* Set up the incoming protocol name and the state of the program. Root is
5378 allowed to force received protocol via the -oMr option above. If we have come
5379 via inetd, the process info has already been set up. We don't set
5380 received_protocol here for smtp input, as it varies according to
5381 batch/HELO/EHLO/AUTH/TLS. */
5385 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5386 smtp_batched_input? "batched " : "",
5387 (sender_address!= NULL)? sender_address : originator_login);
5391 int old_pool = store_pool;
5392 store_pool = POOL_PERM;
5393 if (!received_protocol)
5394 received_protocol = string_sprintf("local%s", called_as);
5395 store_pool = old_pool;
5396 set_process_info("accepting a local non-SMTP message from <%s>",
5400 /* Initialize the session_local_queue-only flag (this will be ignored if
5401 mua_wrapper is set) */
5404 session_local_queue_only = queue_only;
5406 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5407 the spool if so configured. On failure, we must not attempt to send an error
5408 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5409 error code is given.) */
5411 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5412 exim_fail("exim: insufficient disk space\n");
5414 /* If this is smtp input of any kind, real or batched, handle the start of the
5417 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5418 because a log line has already been written for all its failure exists
5419 (usually "connection refused: <reason>") and writing another one is
5420 unnecessary clutter. */
5426 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5427 if (verify_check_host(&hosts_connection_nolog) == OK)
5428 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5429 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5430 if (!smtp_start_session())
5433 exim_exit(EXIT_SUCCESS);
5437 /* Otherwise, set up the input size limit here. */
5441 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5442 if (expand_string_message)
5443 if (thismessage_size_limit == -1)
5444 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5445 "message_size_limit: %s", expand_string_message);
5447 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5448 "message_size_limit: %s", expand_string_message);
5451 /* Loop for several messages when reading SMTP input. If we fork any child
5452 processes, we don't want to wait for them unless synchronous delivery is
5453 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5454 same as SIG_DFL, despite the fact that documentation often lists the default as
5455 "ignore". This is a confusing area. This is what I know:
5457 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5458 processes that complete simply to go away without ever becoming defunct. You
5459 can't then wait for them - but we don't want to wait for them in the
5460 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5461 happen for all OS (e.g. *BSD is different).
5463 But that's not the end of the story. Some (many? all?) systems have the
5464 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5465 has by default, so it seems that the difference is merely one of default
5466 (compare restarting vs non-restarting signals).
5468 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5469 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5470 of the loop below. Paranoia rules.
5472 February 2003: That's *still* not the end of the story. There are now versions
5473 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5474 process then calls waitpid(), a grumble is written to the system log, because
5475 this is logically inconsistent. In other words, it doesn't like the paranoia.
5476 As a consequence of this, the waitpid() below is now excluded if we are sure
5477 that SIG_IGN works. */
5479 if (!f.synchronous_delivery)
5482 struct sigaction act;
5483 act.sa_handler = SIG_IGN;
5484 sigemptyset(&(act.sa_mask));
5485 act.sa_flags = SA_NOCLDWAIT;
5486 sigaction(SIGCHLD, &act, NULL);
5488 signal(SIGCHLD, SIG_IGN);
5492 /* Save the current store pool point, for resetting at the start of
5493 each message, and save the real sender address, if any. */
5495 real_sender_address = sender_address;
5497 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5498 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5503 rmark reset_point = store_mark();
5506 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5507 input and build the recipients list, before calling receive_msg() to read the
5508 message proper. Whatever sender address is given in the SMTP transaction is
5509 often ignored for local senders - we use the actual sender, which is normally
5510 either the underlying user running this process or a -f argument provided by
5511 a trusted caller. It is saved in real_sender_address. The test for whether to
5512 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5517 if ((rc = smtp_setup_msg()) > 0)
5519 if (real_sender_address != NULL &&
5520 !receive_check_set_sender(sender_address))
5522 sender_address = raw_sender = real_sender_address;
5523 sender_address_unrewritten = NULL;
5526 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5527 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5528 the very end. The result of the ACL is ignored (as for other non-SMTP
5529 messages). It is run for its potential side effects. */
5531 if (smtp_batched_input && acl_not_smtp_start != NULL)
5533 uschar *user_msg, *log_msg;
5534 f.enable_dollar_recipients = TRUE;
5535 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5536 &user_msg, &log_msg);
5537 f.enable_dollar_recipients = FALSE;
5540 /* Now get the data for the message */
5542 more = receive_msg(extract_recipients);
5543 if (message_id[0] == 0)
5545 cancel_cutthrough_connection(TRUE, US"receive dropped");
5546 if (more) goto moreloop;
5547 smtp_log_no_mail(); /* Log no mail if configured */
5548 exim_exit(EXIT_FAILURE);
5553 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5554 smtp_log_no_mail(); /* Log no mail if configured */
5555 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5559 /* In the non-SMTP case, we have all the information from the command
5560 line, but must process it in case it is in the more general RFC822
5561 format, and in any case, to detect syntax errors. Also, it appears that
5562 the use of comma-separated lists as single arguments is common, so we
5563 had better support them. */
5568 int count = argc - recipients_arg;
5569 uschar **list = argv + recipients_arg;
5571 /* These options cannot be changed dynamically for non-SMTP messages */
5573 f.active_local_sender_retain = local_sender_retain;
5574 f.active_local_from_check = local_from_check;
5576 /* Save before any rewriting */
5578 raw_sender = string_copy(sender_address);
5580 /* Loop for each argument (supplied by user hence tainted) */
5582 for (int i = 0; i < count; i++)
5584 int start, end, domain;
5586 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5587 * We'll still want to cap it to something, just in case. */
5588 uschar * s = string_copy_taint(exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), TRUE);
5590 /* Loop for each comma-separated address */
5594 BOOL finished = FALSE;
5596 uschar *ss = parse_find_address_end(s, FALSE);
5598 if (*ss == ',') *ss = 0; else finished = TRUE;
5600 /* Check max recipients - if -t was used, these aren't recipients */
5602 if (recipients_max > 0 && ++rcount > recipients_max &&
5603 !extract_recipients)
5604 if (error_handling == ERRORS_STDERR)
5606 fprintf(stderr, "exim: too many recipients\n");
5607 exim_exit(EXIT_FAILURE);
5611 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5612 errors_sender_rc : EXIT_FAILURE;
5616 BOOL b = allow_utf8_domains;
5617 allow_utf8_domains = TRUE;
5620 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5624 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5625 else allow_utf8_domains = b;
5630 if (domain == 0 && !f.allow_unqualified_recipient)
5633 errmess = US"unqualified recipient address not allowed";
5637 if (error_handling == ERRORS_STDERR)
5639 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5640 string_printing(list[i]), errmess);
5641 exim_exit(EXIT_FAILURE);
5647 eblock.text1 = string_printing(list[i]);
5648 eblock.text2 = errmess;
5650 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5651 errors_sender_rc : EXIT_FAILURE;
5654 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5657 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5661 /* Show the recipients when debugging */
5665 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5666 if (recipients_list)
5668 debug_printf("Recipients:\n");
5669 for (int i = 0; i < recipients_count; i++)
5670 debug_printf(" %s\n", recipients_list[i].address);
5674 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5675 ignored; rejecting here would just add complication, and it can just as
5676 well be done later. Allow $recipients to be visible in the ACL. */
5678 if (acl_not_smtp_start)
5680 uschar *user_msg, *log_msg;
5681 f.enable_dollar_recipients = TRUE;
5682 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5683 &user_msg, &log_msg);
5684 f.enable_dollar_recipients = FALSE;
5687 /* Pause for a while waiting for input. If none received in that time,
5688 close the logfile, if we had one open; then if we wait for a long-running
5689 datasource (months, in one use-case) log rotation will not leave us holding
5692 if (!receive_timeout)
5694 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5697 FD_ZERO(&r); FD_SET(0, &r);
5698 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5701 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5702 will just read the headers for the message, and not write anything onto the
5705 message_ended = END_NOTENDED;
5706 more = receive_msg(extract_recipients);
5708 /* more is always FALSE here (not SMTP message) when reading a message
5709 for real; when reading the headers of a message for filter testing,
5710 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5712 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5713 } /* Non-SMTP message reception */
5715 /* If this is a filter testing run, there are headers in store, but
5716 no message on the spool. Run the filtering code in testing mode, setting
5717 the domain to the qualify domain and the local part to the current user,
5718 unless they have been set by options. The prefix and suffix are left unset
5719 unless specified. The the return path is set to to the sender unless it has
5720 already been set from a return-path header in the message. */
5722 if (filter_test != FTEST_NONE)
5724 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5725 deliver_domain_orig = deliver_domain;
5726 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5727 deliver_localpart_orig = deliver_localpart;
5728 deliver_localpart_prefix = US ftest_prefix;
5729 deliver_localpart_suffix = US ftest_suffix;
5730 deliver_home = originator_home;
5734 printf("Return-path copied from sender\n");
5735 return_path = string_copy(sender_address);
5738 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5739 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5741 receive_add_recipient(
5742 string_sprintf("%s%s%s@%s",
5743 ftest_prefix ? ftest_prefix : US"",
5745 ftest_suffix ? ftest_suffix : US"",
5746 deliver_domain), -1);
5748 printf("Recipient = %s\n", recipients_list[0].address);
5749 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5750 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5752 if (chdir("/")) /* Get away from wherever the user is running this from */
5754 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5755 exim_exit(EXIT_FAILURE);
5758 /* Now we run either a system filter test, or a user filter test, or both.
5759 In the latter case, headers added by the system filter will persist and be
5760 available to the user filter. We need to copy the filter variables
5763 if (filter_test & FTEST_SYSTEM)
5764 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5765 exim_exit(EXIT_FAILURE);
5767 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5769 if (filter_test & FTEST_USER)
5770 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5771 exim_exit(EXIT_FAILURE);
5773 exim_exit(EXIT_SUCCESS);
5776 /* Else act on the result of message reception. We should not get here unless
5777 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5778 will be TRUE. If it is not, check on the number of messages received in this
5781 if ( !session_local_queue_only
5782 && smtp_accept_queue_per_connection > 0
5783 && receive_messagecount > smtp_accept_queue_per_connection)
5785 session_local_queue_only = TRUE;
5786 queue_only_reason = 2;
5789 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5790 and queue_only_load is set, check that the load average is below it. If it is
5791 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5792 default), we put the whole session into queue_only mode. It then remains this
5793 way for any subsequent messages on the same SMTP connection. This is a
5794 deliberate choice; even though the load average may fall, it doesn't seem
5795 right to deliver later messages on the same call when not delivering earlier
5796 ones. However, there are odd cases where this is not wanted, so this can be
5797 changed by setting queue_only_load_latch false. */
5799 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5800 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5802 queue_only_reason = 3;
5803 if (queue_only_load_latch) session_local_queue_only = TRUE;
5806 /* If running as an MUA wrapper, all queueing options and freezing options
5810 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5812 /* Log the queueing here, when it will get a message id attached, but
5813 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5816 if (local_queue_only)
5818 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5819 switch(queue_only_reason)
5822 log_write(L_delay_delivery,
5823 LOG_MAIN, "no immediate delivery: more than %d messages "
5824 "received in one connection", smtp_accept_queue_per_connection);
5828 log_write(L_delay_delivery,
5829 LOG_MAIN, "no immediate delivery: load average %.2f",
5830 (double)load_average/1000.0);
5835 else if (f.queue_only_policy || f.deliver_freeze)
5836 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5838 /* Else do the delivery unless the ACL or local_scan() called for queue only
5839 or froze the message. Always deliver in a separate process. A fork failure is
5840 not a disaster, as the delivery will eventually happen on a subsequent queue
5841 run. The search cache must be tidied before the fork, as the parent will
5842 do it before exiting. The child will trigger a lookup failure and
5843 thereby defer the delivery if it tries to use (for example) a cached ldap
5844 connection that the parent has called unbind on. */
5851 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
5854 close_unwanted(); /* Close unwanted file descriptors and TLS */
5855 exim_nullstd(); /* Ensure std{in,out,err} exist */
5857 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5858 mode, deliver_drop_privilege is forced TRUE). */
5860 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5862 delivery_re_exec(CEE_EXEC_EXIT);
5863 /* Control does not return here. */
5866 /* No need to re-exec */
5868 rc = deliver_message(message_id, FALSE, FALSE);
5870 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5871 ? EXIT_SUCCESS : EXIT_FAILURE);
5876 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5877 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5878 "process: %s", strerror(errno));
5882 release_cutthrough_connection(US"msg passed for delivery");
5884 /* In the parent, wait if synchronous delivery is required. This will
5885 always be the case in MUA wrapper mode. */
5887 if (f.synchronous_delivery)
5890 while (wait(&status) != pid);
5891 if ((status & 0x00ff) != 0)
5892 log_write(0, LOG_MAIN|LOG_PANIC,
5893 "process %d crashed with signal %d while delivering %s",
5894 (int)pid, status & 0x00ff, message_id);
5895 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5900 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5901 automatically reaps children (see comments above the loop), clear away any
5902 finished subprocesses here, in case there are lots of messages coming in
5903 from the same source. */
5905 #ifndef SIG_IGN_WORKS
5906 while (waitpid(-1, NULL, WNOHANG) > 0);
5910 return_path = sender_address = NULL;
5911 authenticated_sender = NULL;
5912 deliver_localpart_orig = NULL;
5913 deliver_domain_orig = NULL;
5914 deliver_host = deliver_host_address = NULL;
5915 dnslist_domain = dnslist_matched = NULL;
5916 #ifdef WITH_CONTENT_SCAN
5917 malware_name = NULL;
5919 callout_address = NULL;
5920 sending_ip_address = NULL;
5921 deliver_localpart_data = deliver_domain_data =
5922 recipient_data = sender_data = NULL;
5924 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5926 store_reset(reset_point);
5929 exim_exit(EXIT_SUCCESS); /* Never returns */
5930 return 0; /* To stop compiler warning */