1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
15 #if defined(__GLIBC__) && !defined(__UCLIBC__)
16 # include <gnu/libc-version.h>
20 # include <gnutls/gnutls.h>
21 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
26 extern void init_lookup_list(void);
30 /*************************************************
31 * Function interface to store functions *
32 *************************************************/
34 /* We need some real functions to pass to the PCRE regular expression library
35 for store allocation via Exim's store manager. The normal calls are actually
36 macros that pass over location information to make tracing easier. These
37 functions just interface to the standard macro calls. A good compiler will
38 optimize out the tail recursion and so not make them too expensive. There
39 are two sets of functions; one for use when we want to retain the compiled
40 regular expression for a long time; the other for short-term use. */
43 function_store_get(size_t size)
45 /* For now, regard all RE results as potentially tainted. We might need
46 more intelligence on this point. */
47 return store_get((int)size, TRUE);
51 function_dummy_free(void *block) { block = block; }
54 function_store_malloc(size_t size)
56 return store_malloc((int)size);
60 function_store_free(void *block)
68 /*************************************************
69 * Enums for cmdline interface *
70 *************************************************/
72 enum commandline_info { CMDINFO_NONE=0,
73 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
78 /*************************************************
79 * Compile regular expression and panic on fail *
80 *************************************************/
82 /* This function is called when failure to compile a regular expression leads
83 to a panic exit. In other cases, pcre_compile() is called directly. In many
84 cases where this function is used, the results of the compilation are to be
85 placed in long-lived store, so we temporarily reset the store management
86 functions that PCRE uses if the use_malloc flag is set.
89 pattern the pattern to compile
90 caseless TRUE if caseless matching is required
91 use_malloc TRUE if compile into malloc store
93 Returns: pointer to the compiled pattern
97 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
100 int options = PCRE_COPT;
105 pcre_malloc = function_store_malloc;
106 pcre_free = function_store_free;
108 if (caseless) options |= PCRE_CASELESS;
109 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
110 pcre_malloc = function_store_get;
111 pcre_free = function_dummy_free;
113 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
114 "%s at offset %d while compiling %s", error, offset, pattern);
121 /*************************************************
122 * Execute regular expression and set strings *
123 *************************************************/
125 /* This function runs a regular expression match, and sets up the pointers to
126 the matched substrings.
129 re the compiled expression
130 subject the subject string
131 options additional PCRE options
132 setup if < 0 do full setup
133 if >= 0 setup from setup+1 onwards,
134 excluding the full matched string
136 Returns: TRUE or FALSE
140 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
142 int ovector[3*(EXPAND_MAXN+1)];
143 uschar * s = string_copy(subject); /* de-constifying */
144 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
145 PCRE_EOPT | options, ovector, nelem(ovector));
147 if (n == 0) n = EXPAND_MAXN + 1;
150 expand_nmax = setup < 0 ? 0 : setup + 1;
151 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
153 expand_nstring[expand_nmax] = s + ovector[nn];
154 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
164 /*************************************************
165 * Set up processing details *
166 *************************************************/
168 /* Save a text string for dumping when SIGUSR1 is received.
169 Do checks for overruns.
171 Arguments: format and arguments, as for printf()
176 set_process_info(const char *format, ...)
178 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
183 g = string_fmt_append(&gs, "%5d ", (int)getpid());
185 va_start(ap, format);
186 if (!string_vformat(g, 0, format, ap))
189 g = string_cat(&gs, US"**** string overflowed buffer ****");
191 g = string_catn(g, US"\n", 1);
192 string_from_gstring(g);
193 process_info_len = g->ptr;
194 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
198 /***********************************************
199 * Handler for SIGTERM *
200 ***********************************************/
203 term_handler(int sig)
209 /*************************************************
210 * Handler for SIGUSR1 *
211 *************************************************/
213 /* SIGUSR1 causes any exim process to write to the process log details of
214 what it is currently doing. It will only be used if the OS is capable of
215 setting up a handler that causes automatic restarting of any system call
216 that is in progress at the time.
218 This function takes care to be signal-safe.
220 Argument: the signal number (SIGUSR1)
225 usr1_handler(int sig)
229 os_restarting_signal(sig, usr1_handler);
231 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
233 /* If we are already running as the Exim user, try to create it in the
234 current process (assuming spool_directory exists). Otherwise, if we are
235 root, do the creation in an exim:exim subprocess. */
237 int euid = geteuid();
238 if (euid == exim_uid)
239 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
240 else if (euid == root_uid)
241 fd = log_create_as_exim(process_log_path);
244 /* If we are neither exim nor root, or if we failed to create the log file,
245 give up. There is not much useful we can do with errors, since we don't want
246 to disrupt whatever is going on outside the signal handler. */
250 (void)write(fd, process_info, process_info_len);
256 /*************************************************
258 *************************************************/
260 /* This handler is enabled most of the time that Exim is running. The handler
261 doesn't actually get used unless alarm() has been called to set a timer, to
262 place a time limit on a system call of some kind. When the handler is run, it
265 There are some other SIGALRM handlers that are used in special cases when more
266 than just a flag setting is required; for example, when reading a message's
267 input. These are normally set up in the code module that uses them, and the
268 SIGALRM handler is reset to this one afterwards.
270 Argument: the signal value (SIGALRM)
275 sigalrm_handler(int sig)
277 sig = sig; /* Keep picky compilers happy */
279 os_non_restarting_signal(SIGALRM, sigalrm_handler);
284 /*************************************************
285 * Sleep for a fractional time interval *
286 *************************************************/
288 /* This function is called by millisleep() and exim_wait_tick() to wait for a
289 period of time that may include a fraction of a second. The coding is somewhat
290 tedious. We do not expect setitimer() ever to fail, but if it does, the process
291 will wait for ever, so we panic in this instance. (There was a case of this
292 when a bug in a function that calls milliwait() caused it to pass invalid data.
293 That's when I added the check. :-)
295 We assume it to be not worth sleeping for under 100us; this value will
296 require revisiting as hardware advances. This avoids the issue of
297 a zero-valued timer setting meaning "never fire".
299 Argument: an itimerval structure containing the interval
304 milliwait(struct itimerval *itval)
307 sigset_t old_sigmask;
309 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
311 (void)sigemptyset(&sigmask); /* Empty mask */
312 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
313 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
314 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
315 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
316 "setitimer() failed: %s", strerror(errno));
317 (void)sigfillset(&sigmask); /* All signals */
318 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
319 (void)sigsuspend(&sigmask); /* Until SIGALRM */
320 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
326 /*************************************************
327 * Millisecond sleep function *
328 *************************************************/
330 /* The basic sleep() function has a granularity of 1 second, which is too rough
331 in some cases - for example, when using an increasing delay to slow down
334 Argument: number of millseconds
341 struct itimerval itval;
342 itval.it_interval.tv_sec = 0;
343 itval.it_interval.tv_usec = 0;
344 itval.it_value.tv_sec = msec/1000;
345 itval.it_value.tv_usec = (msec % 1000) * 1000;
351 /*************************************************
352 * Compare microsecond times *
353 *************************************************/
360 Returns: -1, 0, or +1
364 exim_tvcmp(struct timeval *t1, struct timeval *t2)
366 if (t1->tv_sec > t2->tv_sec) return +1;
367 if (t1->tv_sec < t2->tv_sec) return -1;
368 if (t1->tv_usec > t2->tv_usec) return +1;
369 if (t1->tv_usec < t2->tv_usec) return -1;
376 /*************************************************
377 * Clock tick wait function *
378 *************************************************/
380 /* Exim uses a time + a pid to generate a unique identifier in two places: its
381 message IDs, and in file names for maildir deliveries. Because some OS now
382 re-use pids within the same second, sub-second times are now being used.
383 However, for absolute certainty, we must ensure the clock has ticked before
384 allowing the relevant process to complete. At the time of implementation of
385 this code (February 2003), the speed of processors is such that the clock will
386 invariably have ticked already by the time a process has done its job. This
387 function prepares for the time when things are faster - and it also copes with
388 clocks that go backwards.
391 then_tv A timeval which was used to create uniqueness; its usec field
392 has been rounded down to the value of the resolution.
393 We want to be sure the current time is greater than this.
394 resolution The resolution that was used to divide the microseconds
395 (1 for maildir, larger for message ids)
401 exim_wait_tick(struct timeval *then_tv, int resolution)
403 struct timeval now_tv;
404 long int now_true_usec;
406 (void)gettimeofday(&now_tv, NULL);
407 now_true_usec = now_tv.tv_usec;
408 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
410 if (exim_tvcmp(&now_tv, then_tv) <= 0)
412 struct itimerval itval;
413 itval.it_interval.tv_sec = 0;
414 itval.it_interval.tv_usec = 0;
415 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
416 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
418 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
419 negative value for the microseconds is possible only in the case when "now"
420 is more than a second less than "then". That means that itval.it_value.tv_sec
421 is greater than zero. The following correction is therefore safe. */
423 if (itval.it_value.tv_usec < 0)
425 itval.it_value.tv_usec += 1000000;
426 itval.it_value.tv_sec -= 1;
429 DEBUG(D_transport|D_receive)
431 if (!f.running_in_test_harness)
433 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
434 then_tv->tv_sec, (long) then_tv->tv_usec,
435 now_tv.tv_sec, (long) now_tv.tv_usec);
436 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
437 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
448 /*************************************************
449 * Call fopen() with umask 777 and adjust mode *
450 *************************************************/
452 /* Exim runs with umask(0) so that files created with open() have the mode that
453 is specified in the open() call. However, there are some files, typically in
454 the spool directory, that are created with fopen(). They end up world-writeable
455 if no precautions are taken. Although the spool directory is not accessible to
456 the world, this is an untidiness. So this is a wrapper function for fopen()
457 that sorts out the mode of the created file.
460 filename the file name
461 options the fopen() options
462 mode the required mode
464 Returns: the fopened FILE or NULL
468 modefopen(const uschar *filename, const char *options, mode_t mode)
470 mode_t saved_umask = umask(0777);
471 FILE *f = Ufopen(filename, options);
472 (void)umask(saved_umask);
473 if (f != NULL) (void)fchmod(fileno(f), mode);
478 /*************************************************
479 * Ensure stdin, stdout, and stderr exist *
480 *************************************************/
482 /* Some operating systems grumble if an exec() happens without a standard
483 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
484 file will be opened and will use these fd values, and then some other bit of
485 code will assume, for example, that it can write error messages to stderr.
486 This function ensures that fds 0, 1, and 2 are open if they do not already
487 exist, by connecting them to /dev/null.
489 This function is also used to ensure that std{in,out,err} exist at all times,
490 so that if any library that Exim calls tries to use them, it doesn't crash.
501 for (int i = 0; i <= 2; i++)
503 if (fstat(i, &statbuf) < 0 && errno == EBADF)
505 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
506 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
507 string_open_failed(errno, "/dev/null", NULL));
508 if (devnull != i) (void)dup2(devnull, i);
511 if (devnull > 2) (void)close(devnull);
517 /*************************************************
518 * Close unwanted file descriptors for delivery *
519 *************************************************/
521 /* This function is called from a new process that has been forked to deliver
522 an incoming message, either directly, or using exec.
524 We want any smtp input streams to be closed in this new process. However, it
525 has been observed that using fclose() here causes trouble. When reading in -bS
526 input, duplicate copies of messages have been seen. The files will be sharing a
527 file pointer with the parent process, and it seems that fclose() (at least on
528 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
529 least sometimes. Hence we go for closing the underlying file descriptors.
531 If TLS is active, we want to shut down the TLS library, but without molesting
532 the parent's SSL connection.
534 For delivery of a non-SMTP message, we want to close stdin and stdout (and
535 stderr unless debugging) because the calling process might have set them up as
536 pipes and be waiting for them to close before it waits for the submission
537 process to terminate. If they aren't closed, they hold up the calling process
538 until the initial delivery process finishes, which is not what we want.
540 Exception: We do want it for synchronous delivery!
542 And notwithstanding all the above, if D_resolver is set, implying resolver
543 debugging, leave stdout open, because that's where the resolver writes its
546 When we close stderr (which implies we've also closed stdout), we also get rid
547 of any controlling terminal.
559 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
561 (void)close(fileno(smtp_in));
562 (void)close(fileno(smtp_out));
567 (void)close(0); /* stdin */
568 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
569 if (debug_selector == 0) /* stderr */
571 if (!f.synchronous_delivery)
584 /*************************************************
586 *************************************************/
588 /* This function sets a new uid and gid permanently, optionally calling
589 initgroups() to set auxiliary groups. There are some special cases when running
590 Exim in unprivileged modes. In these situations the effective uid will not be
591 root; if we already have the right effective uid/gid, and don't need to
592 initialize any groups, leave things as they are.
597 igflag TRUE if initgroups() wanted
598 msg text to use in debugging output and failure log
600 Returns: nothing; bombs out on failure
604 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
606 uid_t euid = geteuid();
607 gid_t egid = getegid();
609 if (euid == root_uid || euid != uid || egid != gid || igflag)
611 /* At least one OS returns +1 for initgroups failure, so just check for
616 struct passwd *pw = getpwuid(uid);
618 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
619 "no passwd entry for uid=%ld", (long int)uid);
621 if (initgroups(pw->pw_name, gid) != 0)
622 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
623 (long int)uid, strerror(errno));
626 if (setgid(gid) < 0 || setuid(uid) < 0)
627 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
628 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
631 /* Debugging output included uid/gid and all groups */
635 int group_count, save_errno;
636 gid_t group_list[EXIM_GROUPLIST_SIZE];
637 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
638 (long int)geteuid(), (long int)getegid(), (long int)getpid());
639 group_count = getgroups(nelem(group_list), group_list);
641 debug_printf(" auxiliary group list:");
643 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
644 else if (group_count < 0)
645 debug_printf(" <error: %s>", strerror(save_errno));
646 else debug_printf(" <none>");
654 /*************************************************
656 *************************************************/
658 /* Exim exits via this function so that it always clears up any open
664 Returns: does not return
668 exim_exit(int rc, const uschar * process)
673 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
674 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
675 process ? "(" : "", process, process ? ") " : "", rc);
681 exim_underbar_exit(int rc)
689 /* Print error string, then die */
691 exim_fail(const char * fmt, ...)
695 vfprintf(stderr, fmt, ap);
699 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
700 of chown()/fchown(). See src/functions.h for more explanation */
702 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
704 int saved_errno = errno; /* from the preceeding chown call */
706 log_write(0, LOG_MAIN|LOG_PANIC,
707 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
708 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
709 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
711 /* I leave this here, commented, in case the "bug"(?) comes up again.
712 It is not an Exim bug, but we can provide a workaround.
718 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
720 if (buf.st_uid == owner && buf.st_gid == group) return 0;
721 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
723 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
731 /*************************************************
732 * Extract port from host address *
733 *************************************************/
735 /* Called to extract the port from the values given to -oMa and -oMi.
736 It also checks the syntax of the address, and terminates it before the
737 port data when a port is extracted.
740 address the address, with possible port on the end
742 Returns: the port, or zero if there isn't one
743 bombs out on a syntax error
747 check_port(uschar *address)
749 int port = host_address_extract_port(address);
750 if (string_is_ip_address(address, NULL) == 0)
751 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
757 /*************************************************
758 * Test/verify an address *
759 *************************************************/
761 /* This function is called by the -bv and -bt code. It extracts a working
762 address from a full RFC 822 address. This isn't really necessary per se, but it
763 has the effect of collapsing source routes.
767 flags flag bits for verify_address()
768 exit_value to be set for failures
774 test_address(uschar *s, int flags, int *exit_value)
776 int start, end, domain;
777 uschar *parse_error = NULL;
778 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
782 fprintf(stdout, "syntax error: %s\n", parse_error);
787 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
788 -1, -1, NULL, NULL, NULL);
789 if (rc == FAIL) *exit_value = 2;
790 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
796 /*************************************************
797 * Show supported features *
798 *************************************************/
801 show_db_version(FILE * f)
803 #ifdef DB_VERSION_STRING
806 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
807 fprintf(f, " Runtime: %s\n",
808 db_version(NULL, NULL, NULL));
811 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
813 #elif defined(BTREEVERSION) && defined(HASHVERSION)
815 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
817 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
820 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
821 fprintf(f, "Probably ndbm\n");
822 #elif defined(USE_TDB)
823 fprintf(f, "Using tdb\n");
826 fprintf(f, "Probably GDBM (native mode)\n");
828 fprintf(f, "Probably GDBM (compatibility mode)\n");
834 /* This function is called for -bV/--version and for -d to output the optional
835 features of the current Exim binary.
837 Arguments: a FILE for printing
842 show_whats_supported(FILE * fp)
844 DEBUG(D_any) {} else show_db_version(fp);
846 fprintf(fp, "Support for:");
847 #ifdef SUPPORT_CRYPTEQ
848 fprintf(fp, " crypteq");
851 fprintf(fp, " iconv()");
854 fprintf(fp, " IPv6");
856 #ifdef HAVE_SETCLASSRESOURCES
857 fprintf(fp, " use_setclassresources");
863 fprintf(fp, " Perl");
866 fprintf(fp, " Expand_dlfunc");
868 #ifdef USE_TCP_WRAPPERS
869 fprintf(fp, " TCPwrappers");
872 fprintf(fp, " GnuTLS");
875 fprintf(fp, " OpenSSL");
877 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
878 fprintf(fp, " translate_ip_address");
880 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
881 fprintf(fp, " move_frozen_messages");
883 #ifdef WITH_CONTENT_SCAN
884 fprintf(fp, " Content_Scanning");
887 fprintf(fp, " DANE");
890 fprintf(fp, " DKIM");
892 #ifndef DISABLE_DNSSEC
893 fprintf(fp, " DNSSEC");
895 #ifndef DISABLE_EVENT
896 fprintf(fp, " Event");
899 fprintf(fp, " I18N");
902 fprintf(fp, " OCSP");
904 #ifndef DISABLE_PIPE_CONNECT
905 fprintf(fp, " PIPE_CONNECT");
908 fprintf(fp, " PRDR");
911 fprintf(fp, " PROXY");
914 fprintf(fp, " SOCKS");
920 fprintf(fp, " DMARC");
924 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
926 #ifdef EXPERIMENTAL_LMDB
927 fprintf(fp, " Experimental_LMDB");
929 #ifdef EXPERIMENTAL_QUEUEFILE
930 fprintf(fp, " Experimental_QUEUEFILE");
932 #if defined(EXPERIMENTAL_SRS) || defined(EXPERIMENTAL_SRS_NATIVE)
933 fprintf(fp, " Experimental_SRS");
935 #ifdef EXPERIMENTAL_ARC
936 fprintf(fp, " Experimental_ARC");
938 #ifdef EXPERIMENTAL_BRIGHTMAIL
939 fprintf(fp, " Experimental_Brightmail");
941 #ifdef EXPERIMENTAL_DCC
942 fprintf(fp, " Experimental_DCC");
944 #ifdef EXPERIMENTAL_DSN_INFO
945 fprintf(fp, " Experimental_DSN_info");
947 #ifdef EXPERIMENTAL_TLS_RESUME
948 fprintf(fp, " Experimental_TLS_resume");
952 fprintf(fp, "Lookups (built-in):");
953 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
954 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
956 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
959 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
960 fprintf(fp, " dbm dbmjz dbmnz");
962 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
963 fprintf(fp, " dnsdb");
965 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
966 fprintf(fp, " dsearch");
968 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
969 fprintf(fp, " ibase");
971 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
972 fprintf(fp, " json");
974 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
975 fprintf(fp, " ldap ldapdn ldapm");
977 #ifdef EXPERIMENTAL_LMDB
978 fprintf(fp, " lmdb");
980 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
981 fprintf(fp, " mysql");
983 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
984 fprintf(fp, " nis nis0");
986 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
987 fprintf(fp, " nisplus");
989 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
990 fprintf(fp, " oracle");
992 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
993 fprintf(fp, " passwd");
995 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
996 fprintf(fp, " pgsql");
998 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
999 fprintf(fp, " redis");
1001 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1002 fprintf(fp, " sqlite");
1004 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1005 fprintf(fp, " testdb");
1007 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1008 fprintf(fp, " whoson");
1012 auth_show_supported(fp);
1013 route_show_supported(fp);
1014 transport_show_supported(fp);
1016 #ifdef WITH_CONTENT_SCAN
1017 malware_show_supported(fp);
1020 if (fixed_never_users[0] > 0)
1023 fprintf(fp, "Fixed never_users: ");
1024 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1025 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
1026 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
1029 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
1031 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1033 /* Everything else is details which are only worth reporting when debugging.
1034 Perhaps the tls_version_report should move into this too. */
1037 /* clang defines __GNUC__ (at least, for me) so test for it first */
1038 #if defined(__clang__)
1039 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1040 #elif defined(__GNUC__)
1041 fprintf(fp, "Compiler: GCC [%s]\n",
1045 "? unknown version ?"
1049 fprintf(fp, "Compiler: <unknown>\n");
1052 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1053 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1054 __GLIBC__, __GLIBC_MINOR__);
1055 if (__GLIBC_PREREQ(2, 1))
1056 fprintf(fp, " Runtime: %s\n",
1057 gnu_get_libc_version());
1060 show_db_version(fp);
1063 tls_version_report(fp);
1066 utf8_version_report(fp);
1069 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1070 if (authi->version_report)
1071 (*authi->version_report)(fp);
1073 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1074 characters; unless it's an ancient version of PCRE in which case it
1076 #ifndef PCRE_PRERELEASE
1077 # define PCRE_PRERELEASE
1080 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1081 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1083 PCRE_MAJOR, PCRE_MINOR,
1084 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1087 #undef EXPAND_AND_QUOTE
1090 for (int i = 0; i < lookup_list_count; i++)
1091 if (lookup_list[i]->version_report)
1092 lookup_list[i]->version_report(fp);
1094 #ifdef WHITELIST_D_MACROS
1095 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1097 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1099 #ifdef TRUSTED_CONFIG_LIST
1100 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1102 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1109 /*************************************************
1110 * Show auxiliary information about Exim *
1111 *************************************************/
1114 show_exim_information(enum commandline_info request, FILE *stream)
1119 fprintf(stream, "Oops, something went wrong.\n");
1123 "The -bI: flag takes a string indicating which information to provide.\n"
1124 "If the string is not recognised, you'll get this help (on stderr).\n"
1126 " exim -bI:help this information\n"
1127 " exim -bI:dscp list of known dscp value keywords\n"
1128 " exim -bI:sieve list of supported sieve extensions\n"
1132 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1133 fprintf(stream, "%s\n", *pp);
1136 dscp_list_to_stream(stream);
1142 /*************************************************
1143 * Quote a local part *
1144 *************************************************/
1146 /* This function is used when a sender address or a From: or Sender: header
1147 line is being created from the caller's login, or from an authenticated_id. It
1148 applies appropriate quoting rules for a local part.
1150 Argument: the local part
1151 Returns: the local part, quoted if necessary
1155 local_part_quote(uschar *lpart)
1157 BOOL needs_quote = FALSE;
1160 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1162 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1163 (*t != '.' || t == lpart || t[1] == 0);
1166 if (!needs_quote) return lpart;
1168 g = string_catn(NULL, US"\"", 1);
1172 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1175 g = string_cat(g, lpart);
1178 g = string_catn(g, lpart, nq - lpart);
1179 g = string_catn(g, US"\\", 1);
1180 g = string_catn(g, nq, 1);
1184 g = string_catn(g, US"\"", 1);
1185 return string_from_gstring(g);
1191 /*************************************************
1192 * Load readline() functions *
1193 *************************************************/
1195 /* This function is called from testing executions that read data from stdin,
1196 but only when running as the calling user. Currently, only -be does this. The
1197 function loads the readline() function library and passes back the functions.
1198 On some systems, it needs the curses library, so load that too, but try without
1199 it if loading fails. All this functionality has to be requested at build time.
1202 fn_readline_ptr pointer to where to put the readline pointer
1203 fn_addhist_ptr pointer to where to put the addhistory function
1205 Returns: the dlopen handle or NULL on failure
1209 set_readline(char * (**fn_readline_ptr)(const char *),
1210 void (**fn_addhist_ptr)(const char *))
1213 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1215 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1216 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1218 if (dlhandle != NULL)
1220 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1221 * char * readline (const char *prompt);
1222 * void add_history (const char *string);
1224 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1225 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1229 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1238 /*************************************************
1239 * Get a line from stdin for testing things *
1240 *************************************************/
1242 /* This function is called when running tests that can take a number of lines
1243 of input (for example, -be and -bt). It handles continuations and trailing
1244 spaces. And prompting and a blank line output on eof. If readline() is in use,
1245 the arguments are non-NULL and provide the relevant functions.
1248 fn_readline readline function or NULL
1249 fn_addhist addhist function or NULL
1251 Returns: pointer to dynamic memory, or NULL at end of file
1255 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1259 if (!fn_readline) { printf("> "); fflush(stdout); }
1261 for (int i = 0;; i++)
1263 uschar buffer[1024];
1267 char *readline_line = NULL;
1270 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1271 if (*readline_line != 0 && fn_addhist) fn_addhist(readline_line);
1272 p = US readline_line;
1277 /* readline() not in use */
1280 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1284 /* Handle the line */
1286 ss = p + (int)Ustrlen(p);
1287 while (ss > p && isspace(ss[-1])) ss--;
1290 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1292 g = string_catn(g, p, ss - p);
1295 if (fn_readline) free(readline_line);
1298 /* g can only be NULL if ss==p */
1299 if (ss == p || g->s[g->ptr-1] != '\\')
1303 (void) string_from_gstring(g);
1306 if (!g) printf("\n");
1307 return string_from_gstring(g);
1312 /*************************************************
1313 * Output usage information for the program *
1314 *************************************************/
1316 /* This function is called when there are no recipients
1317 or a specific --help argument was added.
1320 progname information on what name we were called by
1322 Returns: DOES NOT RETURN
1326 exim_usage(uschar *progname)
1329 /* Handle specific program invocation variants */
1330 if (Ustrcmp(progname, US"-mailq") == 0)
1332 "mailq - list the contents of the mail queue\n\n"
1333 "For a list of options, see the Exim documentation.\n");
1335 /* Generic usage - we output this whatever happens */
1337 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1338 "not directly from a shell command line. Options and/or arguments control\n"
1339 "what it does when called. For a list of options, see the Exim documentation.\n");
1344 /*************************************************
1345 * Validate that the macros given are okay *
1346 *************************************************/
1348 /* Typically, Exim will drop privileges if macros are supplied. In some
1349 cases, we want to not do so.
1351 Arguments: opt_D_used - true if the commandline had a "-D" option
1352 Returns: true if trusted, false otherwise
1356 macros_trusted(BOOL opt_D_used)
1358 #ifdef WHITELIST_D_MACROS
1359 uschar *whitelisted, *end, *p, **whites;
1360 int white_count, i, n;
1362 BOOL prev_char_item, found;
1367 #ifndef WHITELIST_D_MACROS
1371 /* We only trust -D overrides for some invoking users:
1372 root, the exim run-time user, the optional config owner user.
1373 I don't know why config-owner would be needed, but since they can own the
1374 config files anyway, there's no security risk to letting them override -D. */
1375 if ( ! ((real_uid == root_uid)
1376 || (real_uid == exim_uid)
1377 #ifdef CONFIGURE_OWNER
1378 || (real_uid == config_uid)
1382 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1386 /* Get a list of macros which are whitelisted */
1387 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1388 prev_char_item = FALSE;
1390 for (p = whitelisted; *p != '\0'; ++p)
1392 if (*p == ':' || isspace(*p))
1397 prev_char_item = FALSE;
1400 if (!prev_char_item)
1401 prev_char_item = TRUE;
1408 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1409 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1414 if (i == white_count)
1416 while (*p != '\0' && p < end)
1422 /* The list of commandline macros should be very short.
1423 Accept the N*M complexity. */
1424 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1427 for (uschar ** w = whites; *w; ++w)
1428 if (Ustrcmp(*w, m->name) == 0)
1435 if (!m->replacement)
1437 if ((len = m->replen) == 0)
1439 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1440 0, PCRE_EOPT, NULL, 0);
1443 if (n != PCRE_ERROR_NOMATCH)
1444 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1448 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1454 /*************************************************
1455 * Expansion testing *
1456 *************************************************/
1458 /* Expand and print one item, doing macro-processing.
1461 item line for expansion
1465 expansion_test_line(uschar * line)
1470 Ustrncpy(big_buffer, line, big_buffer_size);
1471 big_buffer[big_buffer_size-1] = '\0';
1472 len = Ustrlen(big_buffer);
1474 (void) macros_expand(0, &len, &dummy_macexp);
1476 if (isupper(big_buffer[0]))
1478 if (macro_read_assignment(big_buffer))
1479 printf("Defined macro '%s'\n", mlast->name);
1482 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1483 else printf("Failed: %s\n", expand_string_message);
1488 /*************************************************
1489 * Entry point and high-level code *
1490 *************************************************/
1492 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1493 the appropriate action. All the necessary functions are present in the one
1494 binary. I originally thought one should split it up, but it turns out that so
1495 much of the apparatus is needed in each chunk that one might as well just have
1496 it all available all the time, which then makes the coding easier as well.
1499 argc count of entries in argv
1500 argv argument strings, with argv[0] being the program name
1502 Returns: EXIT_SUCCESS if terminated successfully
1503 EXIT_FAILURE otherwise, except when a message has been sent
1504 to the sender, and -oee was given
1508 main(int argc, char **cargv)
1510 uschar **argv = USS cargv;
1511 int arg_receive_timeout = -1;
1512 int arg_smtp_receive_timeout = -1;
1513 int arg_error_handling = error_handling;
1514 int filter_sfd = -1;
1515 int filter_ufd = -1;
1518 int list_queue_option = 0;
1520 int msg_action_arg = -1;
1521 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1522 int queue_only_reason = 0;
1524 int perl_start_option = 0;
1526 int recipients_arg = argc;
1527 int sender_address_domain = 0;
1528 int test_retry_arg = -1;
1529 int test_rewrite_arg = -1;
1530 gid_t original_egid;
1531 BOOL arg_queue_only = FALSE;
1532 BOOL bi_option = FALSE;
1533 BOOL checking = FALSE;
1534 BOOL count_queue = FALSE;
1535 BOOL expansion_test = FALSE;
1536 BOOL extract_recipients = FALSE;
1537 BOOL flag_G = FALSE;
1538 BOOL flag_n = FALSE;
1539 BOOL forced_delivery = FALSE;
1540 BOOL f_end_dot = FALSE;
1541 BOOL deliver_give_up = FALSE;
1542 BOOL list_queue = FALSE;
1543 BOOL list_options = FALSE;
1544 BOOL list_config = FALSE;
1545 BOOL local_queue_only;
1547 BOOL one_msg_action = FALSE;
1548 BOOL opt_D_used = FALSE;
1549 BOOL queue_only_set = FALSE;
1550 BOOL receiving_message = TRUE;
1551 BOOL sender_ident_set = FALSE;
1552 BOOL session_local_queue_only;
1554 BOOL removed_privilege = FALSE;
1555 BOOL usage_wanted = FALSE;
1556 BOOL verify_address_mode = FALSE;
1557 BOOL verify_as_sender = FALSE;
1558 BOOL version_printed = FALSE;
1559 uschar *alias_arg = NULL;
1560 uschar *called_as = US"";
1561 uschar *cmdline_syslog_name = NULL;
1562 uschar *start_queue_run_id = NULL;
1563 uschar *stop_queue_run_id = NULL;
1564 uschar *expansion_test_message = NULL;
1565 uschar *ftest_domain = NULL;
1566 uschar *ftest_localpart = NULL;
1567 uschar *ftest_prefix = NULL;
1568 uschar *ftest_suffix = NULL;
1569 uschar *log_oneline = NULL;
1570 uschar *malware_test_file = NULL;
1571 uschar *real_sender_address;
1572 uschar *originator_home = US"/";
1577 struct stat statbuf;
1578 pid_t passed_qr_pid = (pid_t)0;
1579 int passed_qr_pipe = -1;
1580 gid_t group_list[EXIM_GROUPLIST_SIZE];
1582 /* For the -bI: flag */
1583 enum commandline_info info_flag = CMDINFO_NONE;
1584 BOOL info_stdout = FALSE;
1586 /* Possible options for -R and -S */
1588 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1590 /* Need to define this in case we need to change the environment in order
1591 to get rid of a bogus time zone. We have to make it char rather than uschar
1592 because some OS define it in /usr/include/unistd.h. */
1594 extern char **environ;
1596 #ifdef MEASURE_TIMING
1597 (void)gettimeofday(×tamp_startup, NULL);
1600 /* If the Exim user and/or group and/or the configuration file owner/group were
1601 defined by ref:name at build time, we must now find the actual uid/gid values.
1602 This is a feature to make the lives of binary distributors easier. */
1604 #ifdef EXIM_USERNAME
1605 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1608 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1610 /* If ref:name uses a number as the name, route_finduser() returns
1611 TRUE with exim_uid set and pw coerced to NULL. */
1613 exim_gid = pw->pw_gid;
1614 #ifndef EXIM_GROUPNAME
1617 "exim: ref:name should specify a usercode, not a group.\n"
1618 "exim: can't let you get away with it unless you also specify a group.\n");
1622 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1625 #ifdef EXIM_GROUPNAME
1626 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1627 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1630 #ifdef CONFIGURE_OWNERNAME
1631 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1632 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1633 CONFIGURE_OWNERNAME);
1636 /* We default the system_filter_user to be the Exim run-time user, as a
1637 sane non-root value. */
1638 system_filter_uid = exim_uid;
1640 #ifdef CONFIGURE_GROUPNAME
1641 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1642 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1643 CONFIGURE_GROUPNAME);
1646 /* In the Cygwin environment, some initialization used to need doing.
1647 It was fudged in by means of this macro; now no longer but we'll leave
1648 it in case of others. */
1654 /* Check a field which is patched when we are running Exim within its
1655 testing harness; do a fast initial check, and then the whole thing. */
1657 f.running_in_test_harness =
1658 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1659 if (f.running_in_test_harness)
1662 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1663 at the start of a program; however, it seems that some environments do not
1664 follow this. A "strange" locale can affect the formatting of timestamps, so we
1667 setlocale(LC_ALL, "C");
1669 /* Set up the default handler for timing using alarm(). */
1671 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1673 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1674 because store_malloc writes a log entry on failure. */
1676 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1677 exim_fail("exim: failed to get store for log buffer\n");
1679 /* Initialize the default log options. */
1681 bits_set(log_selector, log_selector_size, log_default);
1683 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1684 NULL when the daemon is run and the file is closed. We have to use this
1685 indirection, because some systems don't allow writing to the variable "stderr".
1688 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1690 /* Arrange for the PCRE regex library to use our store functions. Note that
1691 the normal calls are actually macros that add additional arguments for
1692 debugging purposes so we have to assign specially constructed functions here.
1693 The default is to use store in the stacking pool, but this is overridden in the
1694 regex_must_compile() function. */
1696 pcre_malloc = function_store_get;
1697 pcre_free = function_dummy_free;
1699 /* Ensure there is a big buffer for temporary use in several places. It is put
1700 in malloc store so that it can be freed for enlargement if necessary. */
1702 big_buffer = store_malloc(big_buffer_size);
1704 /* Set up the handler for the data request signal, and set the initial
1705 descriptive text. */
1707 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1708 set_process_info("initializing");
1709 os_restarting_signal(SIGUSR1, usr1_handler);
1711 /* If running in a dockerized environment, the TERM signal is only
1712 delegated to the PID 1 if we request it by setting an signal handler */
1713 if (getpid() == 1) signal(SIGTERM, term_handler);
1715 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1716 in the daemon code. For the rest of Exim's uses, we ignore it. */
1718 signal(SIGHUP, SIG_IGN);
1720 /* We don't want to die on pipe errors as the code is written to handle
1721 the write error instead. */
1723 signal(SIGPIPE, SIG_IGN);
1725 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1726 set to SIG_IGN. This causes subprocesses that complete before the parent
1727 process waits for them not to hang around, so when Exim calls wait(), nothing
1728 is there. The wait() code has been made robust against this, but let's ensure
1729 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1730 ending status. We use sigaction rather than plain signal() on those OS where
1731 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1732 problem on AIX with this.) */
1736 struct sigaction act;
1737 act.sa_handler = SIG_DFL;
1738 sigemptyset(&(act.sa_mask));
1740 sigaction(SIGCHLD, &act, NULL);
1743 signal(SIGCHLD, SIG_DFL);
1746 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1751 /* Set up the version number. Set up the leading 'E' for the external form of
1752 message ids, set the pointer to the internal form, and initialize it to
1753 indicate no message being processed. */
1756 message_id_option[0] = '-';
1757 message_id_external = message_id_option + 1;
1758 message_id_external[0] = 'E';
1759 message_id = message_id_external + 1;
1762 /* Set the umask to zero so that any files Exim creates using open() are
1763 created with the modes that it specifies. NOTE: Files created with fopen() have
1764 a problem, which was not recognized till rather late (February 2006). With this
1765 umask, such files will be world writeable. (They are all content scanning files
1766 in the spool directory, which isn't world-accessible, so this is not a
1767 disaster, but it's untidy.) I don't want to change this overall setting,
1768 however, because it will interact badly with the open() calls. Instead, there's
1769 now a function called modefopen() that fiddles with the umask while calling
1774 /* Precompile the regular expression for matching a message id. Keep this in
1775 step with the code that generates ids in the accept.c module. We need to do
1776 this here, because the -M options check their arguments for syntactic validity
1777 using mac_ismsgid, which uses this. */
1780 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1782 /* Precompile the regular expression that is used for matching an SMTP error
1783 code, possibly extended, at the start of an error message. Note that the
1784 terminating whitespace character is included. */
1787 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1790 #ifdef WHITELIST_D_MACROS
1791 /* Precompile the regular expression used to filter the content of macros
1792 given to -D for permissibility. */
1794 regex_whitelisted_macro =
1795 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1798 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1800 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1801 this seems to be a generally accepted convention, since one finds symbolic
1802 links called "mailq" in standard OS configurations. */
1804 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1805 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1808 receiving_message = FALSE;
1809 called_as = US"-mailq";
1812 /* If the program is called as "rmail" treat it as equivalent to
1813 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1814 i.e. preventing a single dot on a line from terminating the message, and
1815 returning with zero return code, even in cases of error (provided an error
1816 message has been sent). */
1818 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1819 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1822 called_as = US"-rmail";
1823 errors_sender_rc = EXIT_SUCCESS;
1826 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1827 this is a smail convention. */
1829 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1830 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1832 smtp_input = smtp_batched_input = TRUE;
1833 called_as = US"-rsmtp";
1836 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1837 this is a smail convention. */
1839 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1840 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1843 receiving_message = FALSE;
1844 called_as = US"-runq";
1847 /* If the program is called as "newaliases" treat it as equivalent to
1848 "exim -bi"; this is a sendmail convention. */
1850 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1851 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1854 receiving_message = FALSE;
1855 called_as = US"-newaliases";
1858 /* Save the original effective uid for a couple of uses later. It should
1859 normally be root, but in some esoteric environments it may not be. */
1861 original_euid = geteuid();
1862 original_egid = getegid();
1864 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1865 to be the same as the real ones. This makes a difference only if Exim is setuid
1866 (or setgid) to something other than root, which could be the case in some
1867 special configurations. */
1869 real_uid = getuid();
1870 real_gid = getgid();
1872 if (real_uid == root_uid)
1874 if ((rv = setgid(real_gid)))
1875 exim_fail("exim: setgid(%ld) failed: %s\n",
1876 (long int)real_gid, strerror(errno));
1877 if ((rv = setuid(real_uid)))
1878 exim_fail("exim: setuid(%ld) failed: %s\n",
1879 (long int)real_uid, strerror(errno));
1882 /* If neither the original real uid nor the original euid was root, Exim is
1883 running in an unprivileged state. */
1885 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1887 /* Scan the program's arguments. Some can be dealt with right away; others are
1888 simply recorded for checking and handling afterwards. Do a high-level switch
1889 on the second character (the one after '-'), to save some effort. */
1891 for (i = 1; i < argc; i++)
1893 BOOL badarg = FALSE;
1894 uschar *arg = argv[i];
1898 /* An argument not starting with '-' is the start of a recipients list;
1899 break out of the options-scanning loop. */
1907 /* An option consisting of -- terminates the options */
1909 if (Ustrcmp(arg, "--") == 0)
1911 recipients_arg = i + 1;
1915 /* Handle flagged options */
1917 switchchar = arg[1];
1920 /* Make all -ex options synonymous with -oex arguments, since that
1921 is assumed by various callers. Also make -qR options synonymous with -R
1922 options, as that seems to be required as well. Allow for -qqR too, and
1923 the same for -S options. */
1925 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1926 Ustrncmp(arg+1, "qR", 2) == 0 ||
1927 Ustrncmp(arg+1, "qS", 2) == 0)
1929 switchchar = arg[2];
1932 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1934 switchchar = arg[3];
1936 f.queue_2stage = TRUE;
1939 /* Make -r synonymous with -f, since it is a documented alias */
1941 else if (arg[1] == 'r') switchchar = 'f';
1943 /* Make -ov synonymous with -v */
1945 else if (Ustrcmp(arg, "-ov") == 0)
1951 /* deal with --option_aliases */
1952 else if (switchchar == '-')
1954 if (Ustrcmp(argrest, "help") == 0)
1956 usage_wanted = TRUE;
1959 else if (Ustrcmp(argrest, "version") == 0)
1966 /* High-level switch on active initial letter */
1971 /* sendmail uses -Ac and -Am to control which .cf file is used;
1974 if (*argrest == '\0') { badarg = TRUE; break; }
1977 BOOL ignore = FALSE;
1982 if (*(argrest + 1) == '\0')
1986 if (!ignore) { badarg = TRUE; break; }
1990 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1991 so has no need of it. */
1994 if (*argrest == 0) i++; /* Skip over the type */
1999 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2001 /* -bd: Run in daemon mode, awaiting SMTP connections.
2002 -bdf: Ditto, but in the foreground.
2005 if (*argrest == 'd')
2007 f.daemon_listen = TRUE;
2008 if (*(++argrest) == 'f') f.background_daemon = FALSE;
2009 else if (*argrest != 0) { badarg = TRUE; break; }
2012 /* -be: Run in expansion test mode
2013 -bem: Ditto, but read a message from a file first
2016 else if (*argrest == 'e')
2018 expansion_test = checking = TRUE;
2019 if (argrest[1] == 'm')
2021 if (++i >= argc) { badarg = TRUE; break; }
2022 expansion_test_message = argv[i];
2025 if (argrest[1] != 0) { badarg = TRUE; break; }
2028 /* -bF: Run system filter test */
2030 else if (*argrest == 'F')
2032 filter_test |= checking = FTEST_SYSTEM;
2033 if (*(++argrest) != 0) { badarg = TRUE; break; }
2034 if (++i < argc) filter_test_sfile = argv[i]; else
2035 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2038 /* -bf: Run user filter test
2039 -bfd: Set domain for filter testing
2040 -bfl: Set local part for filter testing
2041 -bfp: Set prefix for filter testing
2042 -bfs: Set suffix for filter testing
2045 else if (*argrest == 'f')
2047 if (*(++argrest) == 0)
2049 filter_test |= checking = FTEST_USER;
2050 if (++i < argc) filter_test_ufile = argv[i]; else
2051 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2056 exim_fail("exim: string expected after %s\n", arg);
2057 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2058 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2059 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2060 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2061 else { badarg = TRUE; break; }
2065 /* -bh: Host checking - an IP address must follow. */
2067 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2069 if (++i >= argc) { badarg = TRUE; break; }
2070 sender_host_address = argv[i];
2071 host_checking = checking = f.log_testing_mode = TRUE;
2072 f.host_checking_callout = argrest[1] == 'c';
2073 message_logs = FALSE;
2076 /* -bi: This option is used by sendmail to initialize *the* alias file,
2077 though it has the -oA option to specify a different file. Exim has no
2078 concept of *the* alias file, but since Sun's YP make script calls
2079 sendmail this way, some support must be provided. */
2081 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2083 /* -bI: provide information, of the type to follow after a colon.
2084 This is an Exim flag. */
2086 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2088 uschar *p = &argrest[2];
2089 info_flag = CMDINFO_HELP;
2092 if (strcmpic(p, CUS"sieve") == 0)
2094 info_flag = CMDINFO_SIEVE;
2097 else if (strcmpic(p, CUS"dscp") == 0)
2099 info_flag = CMDINFO_DSCP;
2102 else if (strcmpic(p, CUS"help") == 0)
2109 /* -bm: Accept and deliver message - the default option. Reinstate
2110 receiving_message, which got turned off for all -b options. */
2112 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2114 /* -bmalware: test the filename given for malware */
2116 else if (Ustrcmp(argrest, "malware") == 0)
2118 if (++i >= argc) { badarg = TRUE; break; }
2120 malware_test_file = argv[i];
2123 /* -bnq: For locally originating messages, do not qualify unqualified
2124 addresses. In the envelope, this causes errors; in header lines they
2127 else if (Ustrcmp(argrest, "nq") == 0)
2129 f.allow_unqualified_sender = FALSE;
2130 f.allow_unqualified_recipient = FALSE;
2133 /* -bpxx: List the contents of the mail queue, in various forms. If
2134 the option is -bpc, just a queue count is needed. Otherwise, if the
2135 first letter after p is r, then order is random. */
2137 else if (*argrest == 'p')
2139 if (*(++argrest) == 'c')
2142 if (*(++argrest) != 0) badarg = TRUE;
2146 if (*argrest == 'r')
2148 list_queue_option = 8;
2151 else list_queue_option = 0;
2155 /* -bp: List the contents of the mail queue, top-level only */
2157 if (*argrest == 0) {}
2159 /* -bpu: List the contents of the mail queue, top-level undelivered */
2161 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2163 /* -bpa: List the contents of the mail queue, including all delivered */
2165 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2167 /* Unknown after -bp[r] */
2177 /* -bP: List the configuration variables given as the address list.
2178 Force -v, so configuration errors get displayed. */
2180 else if (Ustrcmp(argrest, "P") == 0)
2182 /* -bP config: we need to setup here, because later,
2183 * when list_options is checked, the config is read already */
2184 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2187 readconf_save_config(version_string);
2191 list_options = TRUE;
2192 debug_selector |= D_v;
2193 debug_file = stderr;
2197 /* -brt: Test retry configuration lookup */
2199 else if (Ustrcmp(argrest, "rt") == 0)
2202 test_retry_arg = i + 1;
2206 /* -brw: Test rewrite configuration */
2208 else if (Ustrcmp(argrest, "rw") == 0)
2211 test_rewrite_arg = i + 1;
2215 /* -bS: Read SMTP commands on standard input, but produce no replies -
2216 all errors are reported by sending messages. */
2218 else if (Ustrcmp(argrest, "S") == 0)
2219 smtp_input = smtp_batched_input = receiving_message = TRUE;
2221 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2222 on standard output. */
2224 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2226 /* -bt: address testing mode */
2228 else if (Ustrcmp(argrest, "t") == 0)
2229 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2231 /* -bv: verify addresses */
2233 else if (Ustrcmp(argrest, "v") == 0)
2234 verify_address_mode = checking = f.log_testing_mode = TRUE;
2236 /* -bvs: verify sender addresses */
2238 else if (Ustrcmp(argrest, "vs") == 0)
2240 verify_address_mode = checking = f.log_testing_mode = TRUE;
2241 verify_as_sender = TRUE;
2244 /* -bV: Print version string and support details */
2246 else if (Ustrcmp(argrest, "V") == 0)
2248 printf("Exim version %s #%s built %s\n", version_string,
2249 version_cnumber, version_date);
2250 printf("%s\n", CS version_copyright);
2251 version_printed = TRUE;
2252 show_whats_supported(stdout);
2253 f.log_testing_mode = TRUE;
2256 /* -bw: inetd wait mode, accept a listening socket as stdin */
2258 else if (*argrest == 'w')
2260 f.inetd_wait_mode = TRUE;
2261 f.background_daemon = FALSE;
2262 f.daemon_listen = TRUE;
2263 if (*(++argrest) != '\0')
2264 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2265 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2272 /* -C: change configuration file list; ignore if it isn't really
2273 a change! Enforce a prefix check if required. */
2278 if(++i < argc) argrest = argv[i]; else
2279 { badarg = TRUE; break; }
2281 if (Ustrcmp(config_main_filelist, argrest) != 0)
2283 #ifdef ALT_CONFIG_PREFIX
2285 int len = Ustrlen(ALT_CONFIG_PREFIX);
2286 const uschar *list = argrest;
2288 while((filename = string_nextinlist(&list, &sep, big_buffer,
2289 big_buffer_size)) != NULL)
2291 if ((Ustrlen(filename) < len ||
2292 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2293 Ustrstr(filename, "/../") != NULL) &&
2294 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2295 exim_fail("-C Permission denied\n");
2298 if (real_uid != root_uid)
2300 #ifdef TRUSTED_CONFIG_LIST
2302 if (real_uid != exim_uid
2303 #ifdef CONFIGURE_OWNER
2304 && real_uid != config_uid
2307 f.trusted_config = FALSE;
2310 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2313 struct stat statbuf;
2315 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2316 (statbuf.st_uid != root_uid /* owner not root */
2317 #ifdef CONFIGURE_OWNER
2318 && statbuf.st_uid != config_uid /* owner not the special one */
2321 (statbuf.st_gid != root_gid /* group not root */
2322 #ifdef CONFIGURE_GROUP
2323 && statbuf.st_gid != config_gid /* group not the special one */
2325 && (statbuf.st_mode & 020) != 0 /* group writeable */
2327 (statbuf.st_mode & 2) != 0) /* world writeable */
2329 f.trusted_config = FALSE;
2334 /* Well, the trust list at least is up to scratch... */
2335 rmark reset_point = store_mark();
2336 uschar *trusted_configs[32];
2340 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2342 uschar *start = big_buffer, *nl;
2343 while (*start && isspace(*start))
2347 nl = Ustrchr(start, '\n');
2350 trusted_configs[nr_configs++] = string_copy(start);
2351 if (nr_configs == 32)
2359 const uschar *list = argrest;
2361 while (f.trusted_config && (filename = string_nextinlist(&list,
2362 &sep, big_buffer, big_buffer_size)) != NULL)
2364 for (i=0; i < nr_configs; i++)
2365 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2367 if (i == nr_configs)
2369 f.trusted_config = FALSE;
2374 else /* No valid prefixes found in trust_list file. */
2375 f.trusted_config = FALSE;
2376 store_reset(reset_point);
2379 else /* Could not open trust_list file. */
2380 f.trusted_config = FALSE;
2383 /* Not root; don't trust config */
2384 f.trusted_config = FALSE;
2388 config_main_filelist = argrest;
2389 f.config_changed = TRUE;
2394 /* -D: set up a macro definition */
2397 #ifdef DISABLE_D_OPTION
2398 exim_fail("exim: -D is not available in this Exim binary\n");
2404 uschar *s = argrest;
2407 while (isspace(*s)) s++;
2409 if (*s < 'A' || *s > 'Z')
2410 exim_fail("exim: macro name set by -D must start with "
2411 "an upper case letter\n");
2413 while (isalnum(*s) || *s == '_')
2415 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2419 if (ptr == 0) { badarg = TRUE; break; }
2420 while (isspace(*s)) s++;
2423 if (*s++ != '=') { badarg = TRUE; break; }
2424 while (isspace(*s)) s++;
2427 for (m = macros_user; m; m = m->next)
2428 if (Ustrcmp(m->name, name) == 0)
2429 exim_fail("exim: duplicated -D in command line\n");
2431 m = macro_create(name, s, TRUE);
2433 if (clmacro_count >= MAX_CLMACROS)
2434 exim_fail("exim: too many -D options on command line\n");
2435 clmacros[clmacro_count++] =
2436 string_sprintf("-D%s=%s", m->name, m->replacement);
2441 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2442 The latter is now a no-op, retained for compatibility only. If -dd is used,
2443 debugging subprocesses of the daemon is disabled. */
2446 if (Ustrcmp(argrest, "ropcr") == 0)
2448 /* drop_cr = TRUE; */
2451 /* Use an intermediate variable so that we don't set debugging while
2452 decoding the debugging bits. */
2456 unsigned int selector = D_default;
2459 if (*argrest == 'd')
2461 f.debug_daemon = TRUE;
2465 decode_bits(&selector, 1, debug_notall, argrest,
2466 debug_options, debug_options_count, US"debug", 0);
2467 debug_selector = selector;
2472 /* -E: This is a local error message. This option is not intended for
2473 external use at all, but is not restricted to trusted callers because it
2474 does no harm (just suppresses certain error messages) and if Exim is run
2475 not setuid root it won't always be trusted when it generates error
2476 messages using this option. If there is a message id following -E, point
2477 message_reference at it, for logging. */
2480 f.local_error_message = TRUE;
2481 if (mac_ismsgid(argrest)) message_reference = argrest;
2485 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2486 option, so it looks as if historically the -oex options are also callable
2487 without the leading -o. So we have to accept them. Before the switch,
2488 anything starting -oe has been converted to -e. Exim does not support all
2489 of the sendmail error options. */
2492 if (Ustrcmp(argrest, "e") == 0)
2494 arg_error_handling = ERRORS_SENDER;
2495 errors_sender_rc = EXIT_SUCCESS;
2497 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2498 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2499 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2500 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2505 /* -F: Set sender's full name, used instead of the gecos entry from
2506 the password file. Since users can usually alter their gecos entries,
2507 there's no security involved in using this instead. The data can follow
2508 the -F or be in the next argument. */
2513 if(++i < argc) argrest = argv[i]; else
2514 { badarg = TRUE; break; }
2516 originator_name = argrest;
2517 f.sender_name_forced = TRUE;
2521 /* -f: Set sender's address - this value is only actually used if Exim is
2522 run by a trusted user, or if untrusted_set_sender is set and matches the
2523 address, except that the null address can always be set by any user. The
2524 test for this happens later, when the value given here is ignored when not
2525 permitted. For an untrusted user, the actual sender is still put in Sender:
2526 if it doesn't match the From: header (unless no_local_from_check is set).
2527 The data can follow the -f or be in the next argument. The -r switch is an
2528 obsolete form of -f but since there appear to be programs out there that
2529 use anything that sendmail has ever supported, better accept it - the
2530 synonymizing is done before the switch above.
2532 At this stage, we must allow domain literal addresses, because we don't
2533 know what the setting of allow_domain_literals is yet. Ditto for trailing
2534 dots and strip_trailing_dot. */
2538 int dummy_start, dummy_end;
2542 if (i+1 < argc) argrest = argv[++i]; else
2543 { badarg = TRUE; break; }
2546 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2549 uschar *temp = argrest + Ustrlen(argrest) - 1;
2550 while (temp >= argrest && isspace(*temp)) temp--;
2551 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2552 allow_domain_literals = TRUE;
2553 strip_trailing_dot = TRUE;
2555 allow_utf8_domains = TRUE;
2557 sender_address = parse_extract_address(argrest, &errmess,
2558 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2559 sender_address = string_copy_taint(sender_address, TRUE);
2561 message_smtputf8 = string_is_utf8(sender_address);
2562 allow_utf8_domains = FALSE;
2564 allow_domain_literals = FALSE;
2565 strip_trailing_dot = FALSE;
2566 if (!sender_address)
2567 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2569 f.sender_address_forced = TRUE;
2573 /* -G: sendmail invocation to specify that it's a gateway submission and
2574 sendmail may complain about problems instead of fixing them.
2575 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2576 not at this time complain about problems. */
2582 /* -h: Set the hop count for an incoming message. Exim does not currently
2583 support this; it always computes it by counting the Received: headers.
2584 To put it in will require a change to the spool header file format. */
2589 if(++i < argc) argrest = argv[i]; else
2590 { badarg = TRUE; break; }
2592 if (!isdigit(*argrest)) badarg = TRUE;
2596 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2597 not to be documented for sendmail but mailx (at least) uses it) */
2600 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2604 /* -L: set the identifier used for syslog; equivalent to setting
2605 syslog_processname in the config file, but needs to be an admin option. */
2608 if (*argrest == '\0')
2610 if(++i < argc) argrest = argv[i]; else
2611 { badarg = TRUE; break; }
2613 if ((sz = Ustrlen(argrest)) > 32)
2614 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2616 exim_fail("exim: the -L syslog name is too short\n");
2617 cmdline_syslog_name = argrest;
2621 receiving_message = FALSE;
2623 /* -MC: continue delivery of another message via an existing open
2624 file descriptor. This option is used for an internal call by the
2625 smtp transport when there is a pending message waiting to go to an
2626 address to which it has got a connection. Five subsequent arguments are
2627 required: transport name, host name, IP address, sequence number, and
2628 message_id. Transports may decline to create new processes if the sequence
2629 number gets too big. The channel is stdin. This (-MC) must be the last
2630 argument. There's a subsequent check that the real-uid is privileged.
2632 If we are running in the test harness. delay for a bit, to let the process
2633 that set this one up complete. This makes for repeatability of the logging,
2636 if (Ustrcmp(argrest, "C") == 0)
2638 union sockaddr_46 interface_sock;
2639 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2642 exim_fail("exim: too many or too few arguments after -MC\n");
2644 if (msg_action_arg >= 0)
2645 exim_fail("exim: incompatible arguments\n");
2647 continue_transport = argv[++i];
2648 continue_hostname = argv[++i];
2649 continue_host_address = argv[++i];
2650 continue_sequence = Uatoi(argv[++i]);
2651 msg_action = MSG_DELIVER;
2652 msg_action_arg = ++i;
2653 forced_delivery = TRUE;
2654 queue_run_pid = passed_qr_pid;
2655 queue_run_pipe = passed_qr_pipe;
2657 if (!mac_ismsgid(argv[i]))
2658 exim_fail("exim: malformed message id %s after -MC option\n",
2661 /* Set up $sending_ip_address and $sending_port, unless proxied */
2663 if (!continue_proxy_cipher)
2664 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2666 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2669 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2672 testharness_pause_ms(500);
2676 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2680 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2681 precedes -MC (see above). The flag indicates that the host to which
2682 Exim is connected has accepted an AUTH sequence. */
2684 case 'A': f.smtp_authenticated = TRUE; break;
2686 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2687 that exim is connected to supports the esmtp extension DSN */
2689 case 'D': smtp_peer_options |= OPTION_DSN; break;
2691 /* -MCG: set the queue name, to a non-default value */
2693 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2697 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2699 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2701 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2702 it preceded -MC (see above) */
2704 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2706 /* -MCQ: pass on the pid of the queue-running process that started
2707 this chain of deliveries and the fd of its synchronizing pipe; this
2708 is useful only when it precedes -MC (see above) */
2710 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2712 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2716 /* -MCS: set the smtp_use_size flag; this is useful only when it
2717 precedes -MC (see above) */
2719 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2722 /* -MCt: similar to -MCT below but the connection is still open
2723 via a proxy process which handles the TLS context and coding.
2724 Require three arguments for the proxied local address and port,
2725 and the TLS cipher. */
2727 case 't': if (++i < argc) sending_ip_address = argv[i];
2729 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2731 if (++i < argc) continue_proxy_cipher = argv[i];
2735 /* -MCT: set the tls_offered flag; this is useful only when it
2736 precedes -MC (see above). The flag indicates that the host to which
2737 Exim is connected has offered TLS support. */
2739 case 'T': smtp_peer_options |= OPTION_TLS; break;
2742 default: badarg = TRUE; break;
2747 /* -M[x]: various operations on the following list of message ids:
2748 -M deliver the messages, ignoring next retry times and thawing
2749 -Mc deliver the messages, checking next retry times, no thawing
2750 -Mf freeze the messages
2751 -Mg give up on the messages
2752 -Mt thaw the messages
2753 -Mrm remove the messages
2754 In the above cases, this must be the last option. There are also the
2755 following options which are followed by a single message id, and which
2756 act on that message. Some of them use the "recipient" addresses as well.
2757 -Mar add recipient(s)
2758 -Mmad mark all recipients delivered
2759 -Mmd mark recipients(s) delivered
2761 -Mset load a message for use with -be
2763 -Mvc show copy (of whole message, in RFC 2822 format)
2768 else if (*argrest == 0)
2770 msg_action = MSG_DELIVER;
2771 forced_delivery = f.deliver_force_thaw = TRUE;
2773 else if (Ustrcmp(argrest, "ar") == 0)
2775 msg_action = MSG_ADD_RECIPIENT;
2776 one_msg_action = TRUE;
2778 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2779 else if (Ustrcmp(argrest, "es") == 0)
2781 msg_action = MSG_EDIT_SENDER;
2782 one_msg_action = TRUE;
2784 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2785 else if (Ustrcmp(argrest, "g") == 0)
2787 msg_action = MSG_DELIVER;
2788 deliver_give_up = TRUE;
2790 else if (Ustrcmp(argrest, "mad") == 0)
2792 msg_action = MSG_MARK_ALL_DELIVERED;
2794 else if (Ustrcmp(argrest, "md") == 0)
2796 msg_action = MSG_MARK_DELIVERED;
2797 one_msg_action = TRUE;
2799 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2800 else if (Ustrcmp(argrest, "set") == 0)
2802 msg_action = MSG_LOAD;
2803 one_msg_action = TRUE;
2805 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2806 else if (Ustrcmp(argrest, "vb") == 0)
2808 msg_action = MSG_SHOW_BODY;
2809 one_msg_action = TRUE;
2811 else if (Ustrcmp(argrest, "vc") == 0)
2813 msg_action = MSG_SHOW_COPY;
2814 one_msg_action = TRUE;
2816 else if (Ustrcmp(argrest, "vh") == 0)
2818 msg_action = MSG_SHOW_HEADER;
2819 one_msg_action = TRUE;
2821 else if (Ustrcmp(argrest, "vl") == 0)
2823 msg_action = MSG_SHOW_LOG;
2824 one_msg_action = TRUE;
2826 else { badarg = TRUE; break; }
2828 /* All the -Mxx options require at least one message id. */
2830 msg_action_arg = i + 1;
2831 if (msg_action_arg >= argc)
2832 exim_fail("exim: no message ids given after %s option\n", arg);
2834 /* Some require only message ids to follow */
2836 if (!one_msg_action)
2838 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2839 exim_fail("exim: malformed message id %s after %s option\n",
2841 goto END_ARG; /* Remaining args are ids */
2844 /* Others require only one message id, possibly followed by addresses,
2845 which will be handled as normal arguments. */
2849 if (!mac_ismsgid(argv[msg_action_arg]))
2850 exim_fail("exim: malformed message id %s after %s option\n",
2851 argv[msg_action_arg], arg);
2857 /* Some programs seem to call the -om option without the leading o;
2858 for sendmail it askes for "me too". Exim always does this. */
2861 if (*argrest != 0) badarg = TRUE;
2865 /* -N: don't do delivery - a debugging option that stops transports doing
2866 their thing. It implies debugging at the D_v level. */
2871 f.dont_deliver = TRUE;
2872 debug_selector |= D_v;
2873 debug_file = stderr;
2879 /* -n: This means "don't alias" in sendmail, apparently.
2880 For normal invocations, it has no effect.
2881 It may affect some other options. */
2887 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2888 option to the specified value. This form uses long names. We need to handle
2889 -O option=value and -Ooption=value. */
2895 exim_fail("exim: string expected after -O\n");
2901 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2904 if (*argrest == 'A')
2906 alias_arg = argrest + 1;
2907 if (alias_arg[0] == 0)
2909 if (i+1 < argc) alias_arg = argv[++i]; else
2910 exim_fail("exim: string expected after -oA\n");
2914 /* -oB: Set a connection message max value for remote deliveries */
2916 else if (*argrest == 'B')
2918 uschar *p = argrest + 1;
2921 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2923 connection_max_messages = 1;
2931 exim_fail("exim: number expected after -oB\n");
2932 connection_max_messages = Uatoi(p);
2936 /* -odb: background delivery */
2938 else if (Ustrcmp(argrest, "db") == 0)
2940 f.synchronous_delivery = FALSE;
2941 arg_queue_only = FALSE;
2942 queue_only_set = TRUE;
2945 /* -odf: foreground delivery (smail-compatible option); same effect as
2946 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2949 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2951 f.synchronous_delivery = TRUE;
2952 arg_queue_only = FALSE;
2953 queue_only_set = TRUE;
2956 /* -odq: queue only */
2958 else if (Ustrcmp(argrest, "dq") == 0)
2960 f.synchronous_delivery = FALSE;
2961 arg_queue_only = TRUE;
2962 queue_only_set = TRUE;
2965 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2966 but no remote delivery */
2968 else if (Ustrcmp(argrest, "dqs") == 0)
2970 f.queue_smtp = TRUE;
2971 arg_queue_only = FALSE;
2972 queue_only_set = TRUE;
2975 /* -oex: Sendmail error flags. As these are also accepted without the
2976 leading -o prefix, for compatibility with vacation and other callers,
2977 they are handled with -e above. */
2979 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2980 -oitrue: Another sendmail syntax for the same */
2982 else if (Ustrcmp(argrest, "i") == 0 ||
2983 Ustrcmp(argrest, "itrue") == 0)
2986 /* -oM*: Set various characteristics for an incoming message; actually
2987 acted on for trusted callers only. */
2989 else if (*argrest == 'M')
2992 exim_fail("exim: data expected after -o%s\n", argrest);
2994 /* -oMa: Set sender host address */
2996 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2998 /* -oMaa: Set authenticator name */
3000 else if (Ustrcmp(argrest, "Maa") == 0)
3001 sender_host_authenticated = argv[++i];
3003 /* -oMas: setting authenticated sender */
3005 else if (Ustrcmp(argrest, "Mas") == 0)
3006 authenticated_sender = string_copy_taint(argv[++i], TRUE);
3008 /* -oMai: setting authenticated id */
3010 else if (Ustrcmp(argrest, "Mai") == 0)
3011 authenticated_id = string_copy_taint(argv[++i], TRUE);
3013 /* -oMi: Set incoming interface address */
3015 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3017 /* -oMm: Message reference */
3019 else if (Ustrcmp(argrest, "Mm") == 0)
3021 if (!mac_ismsgid(argv[i+1]))
3022 exim_fail("-oMm must be a valid message ID\n");
3023 if (!f.trusted_config)
3024 exim_fail("-oMm must be called by a trusted user/config\n");
3025 message_reference = argv[++i];
3028 /* -oMr: Received protocol */
3030 else if (Ustrcmp(argrest, "Mr") == 0)
3032 if (received_protocol)
3033 exim_fail("received_protocol is set already\n");
3035 received_protocol = argv[++i];
3037 /* -oMs: Set sender host name */
3039 else if (Ustrcmp(argrest, "Ms") == 0)
3040 sender_host_name = string_copy_taint(argv[++i], TRUE);
3042 /* -oMt: Set sender ident */
3044 else if (Ustrcmp(argrest, "Mt") == 0)
3046 sender_ident_set = TRUE;
3047 sender_ident = argv[++i];
3050 /* Else a bad argument */
3059 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3060 seem to call this as -m (undocumented), so that is also accepted (see
3063 else if (Ustrcmp(argrest, "m") == 0) {}
3065 /* -oo: An ancient flag for old-style addresses which still seems to
3066 crop up in some calls (see in SCO). */
3068 else if (Ustrcmp(argrest, "o") == 0) {}
3070 /* -oP <name>: set pid file path for daemon
3071 -oPX: delete pid file of daemon */
3073 else if (Ustrcmp(argrest, "P") == 0)
3074 override_pid_file_path = argv[++i];
3076 else if (Ustrcmp(argrest, "PX") == 0)
3079 /* -or <n>: set timeout for non-SMTP acceptance
3080 -os <n>: set timeout for SMTP acceptance */
3082 else if (*argrest == 'r' || *argrest == 's')
3084 int *tp = (*argrest == 'r')?
3085 &arg_receive_timeout : &arg_smtp_receive_timeout;
3086 if (argrest[1] == 0)
3088 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3090 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3092 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3095 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3097 else if (Ustrcmp(argrest, "X") == 0)
3098 override_local_interfaces = argv[++i];
3100 /* Unknown -o argument */
3106 /* -ps: force Perl startup; -pd force delayed Perl startup */
3110 if (*argrest == 's' && argrest[1] == 0)
3112 perl_start_option = 1;
3115 if (*argrest == 'd' && argrest[1] == 0)
3117 perl_start_option = -1;
3122 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3123 which sets the host protocol and host name */
3127 argrest = argv[++i];
3129 { badarg = TRUE; break; }
3135 if (received_protocol)
3136 exim_fail("received_protocol is set already\n");
3138 hn = Ustrchr(argrest, ':');
3140 received_protocol = argrest;
3143 int old_pool = store_pool;
3144 store_pool = POOL_PERM;
3145 received_protocol = string_copyn(argrest, hn - argrest);
3146 store_pool = old_pool;
3147 sender_host_name = hn + 1;
3154 receiving_message = FALSE;
3155 if (queue_interval >= 0)
3156 exim_fail("exim: -q specified more than once\n");
3158 /* -qq...: Do queue runs in a 2-stage manner */
3160 if (*argrest == 'q')
3162 f.queue_2stage = TRUE;
3166 /* -qi...: Do only first (initial) deliveries */
3168 if (*argrest == 'i')
3170 f.queue_run_first_delivery = TRUE;
3174 /* -qf...: Run the queue, forcing deliveries
3175 -qff..: Ditto, forcing thawing as well */
3177 if (*argrest == 'f')
3179 f.queue_run_force = TRUE;
3180 if (*++argrest == 'f')
3182 f.deliver_force_thaw = TRUE;
3187 /* -q[f][f]l...: Run the queue only on local deliveries */
3189 if (*argrest == 'l')
3191 f.queue_run_local = TRUE;
3195 /* -q[f][f][l][G<name>]... Work on the named queue */
3197 if (*argrest == 'G')
3200 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3201 queue_name = string_copyn(argrest, i);
3203 if (*argrest == '/') argrest++;
3206 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3207 only, optionally named, optionally starting from a given message id. */
3209 if (!(list_queue || count_queue))
3211 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3214 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3215 start_queue_run_id = argv[++i];
3216 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3217 stop_queue_run_id = argv[++i];
3220 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3221 forced, optionally local only, optionally named. */
3223 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3225 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3229 case 'R': /* Synonymous with -qR... */
3230 receiving_message = FALSE;
3232 /* -Rf: As -R (below) but force all deliveries,
3233 -Rff: Ditto, but also thaw all frozen messages,
3234 -Rr: String is regex
3235 -Rrf: Regex and force
3236 -Rrff: Regex and force and thaw
3238 in all cases provided there are no further characters in this
3242 for (int i = 0; i < nelem(rsopts); i++)
3243 if (Ustrcmp(argrest, rsopts[i]) == 0)
3245 if (i != 2) f.queue_run_force = TRUE;
3246 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3247 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3248 argrest += Ustrlen(rsopts[i]);
3251 /* -R: Set string to match in addresses for forced queue run to
3252 pick out particular messages. */
3255 deliver_selectstring = argrest;
3256 else if (i+1 < argc)
3257 deliver_selectstring = argv[++i];
3259 exim_fail("exim: string expected after -R\n");
3263 /* -r: an obsolete synonym for -f (see above) */
3266 /* -S: Like -R but works on sender. */
3268 case 'S': /* Synonymous with -qS... */
3269 receiving_message = FALSE;
3271 /* -Sf: As -S (below) but force all deliveries,
3272 -Sff: Ditto, but also thaw all frozen messages,
3273 -Sr: String is regex
3274 -Srf: Regex and force
3275 -Srff: Regex and force and thaw
3277 in all cases provided there are no further characters in this
3281 for (int i = 0; i < nelem(rsopts); i++)
3282 if (Ustrcmp(argrest, rsopts[i]) == 0)
3284 if (i != 2) f.queue_run_force = TRUE;
3285 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3286 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3287 argrest += Ustrlen(rsopts[i]);
3290 /* -S: Set string to match in addresses for forced queue run to
3291 pick out particular messages. */
3294 deliver_selectstring_sender = argrest;
3295 else if (i+1 < argc)
3296 deliver_selectstring_sender = argv[++i];
3298 exim_fail("exim: string expected after -S\n");
3301 /* -Tqt is an option that is exclusively for use by the testing suite.
3302 It is not recognized in other circumstances. It allows for the setting up
3303 of explicit "queue times" so that various warning/retry things can be
3304 tested. Otherwise variability of clock ticks etc. cause problems. */
3307 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3308 fudged_queue_times = argv[++i];
3313 /* -t: Set flag to extract recipients from body of message. */
3316 if (*argrest == 0) extract_recipients = TRUE;
3318 /* -ti: Set flag to extract recipients from body of message, and also
3319 specify that dot does not end the message. */
3321 else if (Ustrcmp(argrest, "i") == 0)
3323 extract_recipients = TRUE;
3327 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3330 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3337 /* -U: This means "initial user submission" in sendmail, apparently. The
3338 doc claims that in future sendmail may refuse syntactically invalid
3339 messages instead of fixing them. For the moment, we just ignore it. */
3345 /* -v: verify things - this is a very low-level debugging */
3350 debug_selector |= D_v;
3351 debug_file = stderr;
3357 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3359 The -x flag tells the sendmail command that mail from a local
3360 mail program has National Language Support (NLS) extended characters
3361 in the body of the mail item. The sendmail command can send mail with
3362 extended NLS characters across networks that normally corrupts these
3365 As Exim is 8-bit clean, it just ignores this flag. */
3368 if (*argrest != 0) badarg = TRUE;
3371 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3372 logs to that file. We swallow the parameter and otherwise ignore it. */
3375 if (*argrest == '\0')
3377 exim_fail("exim: string expected after -X\n");
3381 if (*argrest == '\0')
3383 log_oneline = argv[i];
3385 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3388 /* All other initial characters are errors */
3393 } /* End of high-level switch statement */
3395 /* Failed to recognize the option, or syntax error */
3398 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3399 "option %s\n", arg);
3403 /* If -R or -S have been specified without -q, assume a single queue run. */
3405 if ( (deliver_selectstring || deliver_selectstring_sender)
3406 && queue_interval < 0)
3411 /* If usage_wanted is set we call the usage function - which never returns */
3412 if (usage_wanted) exim_usage(called_as);
3414 /* Arguments have been processed. Check for incompatibilities. */
3416 (smtp_input || extract_recipients || recipients_arg < argc) &&
3417 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3418 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3419 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3422 msg_action_arg > 0 &&
3423 (f.daemon_listen || queue_interval > 0 || list_options ||
3424 (checking && msg_action != MSG_LOAD) ||
3425 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3428 (f.daemon_listen || queue_interval > 0) &&
3429 (sender_address != NULL || list_options || list_queue || checking ||
3433 f.daemon_listen && queue_interval == 0
3436 f.inetd_wait_mode && queue_interval >= 0
3440 (checking || smtp_input || extract_recipients ||
3441 filter_test != FTEST_NONE || bi_option)
3444 verify_address_mode &&
3445 (f.address_test_mode || smtp_input || extract_recipients ||
3446 filter_test != FTEST_NONE || bi_option)
3449 f.address_test_mode && (smtp_input || extract_recipients ||
3450 filter_test != FTEST_NONE || bi_option)
3453 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3457 deliver_selectstring != NULL && queue_interval < 0
3460 msg_action == MSG_LOAD &&
3461 (!expansion_test || expansion_test_message != NULL)
3464 exim_fail("exim: incompatible command-line options or arguments\n");
3466 /* If debugging is set up, set the file and the file descriptor to pass on to
3467 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3468 to run in the foreground. */
3470 if (debug_selector != 0)
3472 debug_file = stderr;
3473 debug_fd = fileno(debug_file);
3474 f.background_daemon = FALSE;
3475 testharness_pause_ms(100); /* lets caller finish */
3476 if (debug_selector != D_v) /* -v only doesn't show this */
3478 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3479 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3481 if (!version_printed)
3482 show_whats_supported(stderr);
3486 /* When started with root privilege, ensure that the limits on the number of
3487 open files and the number of processes (where that is accessible) are
3488 sufficiently large, or are unset, in case Exim has been called from an
3489 environment where the limits are screwed down. Not all OS have the ability to
3490 change some of these limits. */
3494 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3500 #ifdef RLIMIT_NOFILE
3501 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3503 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3505 rlp.rlim_cur = rlp.rlim_max = 0;
3508 /* I originally chose 1000 as a nice big number that was unlikely to
3509 be exceeded. It turns out that some older OS have a fixed upper limit of
3512 if (rlp.rlim_cur < 1000)
3514 rlp.rlim_cur = rlp.rlim_max = 1000;
3515 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3517 rlp.rlim_cur = rlp.rlim_max = 256;
3518 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3519 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3526 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3528 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3530 rlp.rlim_cur = rlp.rlim_max = 0;
3533 #ifdef RLIM_INFINITY
3534 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3536 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3538 if (rlp.rlim_cur < 1000)
3540 rlp.rlim_cur = rlp.rlim_max = 1000;
3542 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3543 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3549 /* Exim is normally entered as root (but some special configurations are
3550 possible that don't do this). However, it always spins off sub-processes that
3551 set their uid and gid as required for local delivery. We don't want to pass on
3552 any extra groups that root may belong to, so we want to get rid of them all at
3555 We need to obey setgroups() at this stage, before possibly giving up root
3556 privilege for a changed configuration file, but later on we might need to
3557 check on the additional groups for the admin user privilege - can't do that
3558 till after reading the config, which might specify the exim gid. Therefore,
3559 save the group list here first. */
3561 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3562 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3564 /* There is a fundamental difference in some BSD systems in the matter of
3565 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3566 known not to be different. On the "different" systems there is a single group
3567 list, and the first entry in it is the current group. On all other versions of
3568 Unix there is a supplementary group list, which is in *addition* to the current
3569 group. Consequently, to get rid of all extraneous groups on a "standard" system
3570 you pass over 0 groups to setgroups(), while on a "different" system you pass
3571 over a single group - the current group, which is always the first group in the
3572 list. Calling setgroups() with zero groups on a "different" system results in
3573 an error return. The following code should cope with both types of system.
3575 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3576 the "setgroups() with zero groups" - and changes the egid.
3577 Thanks to that we had to stash the original_egid above, for use below
3578 in the call to exim_setugid().
3580 However, if this process isn't running as root, setgroups() can't be used
3581 since you have to be root to run it, even if throwing away groups. Not being
3582 root here happens only in some unusual configurations. We just ignore the
3585 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0 && !unprivileged)
3586 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3588 /* If the configuration file name has been altered by an argument on the
3589 command line (either a new file name or a macro definition) and the caller is
3590 not root, or if this is a filter testing run, remove any setuid privilege the
3591 program has and run as the underlying user.
3593 The exim user is locked out of this, which severely restricts the use of -C
3596 Otherwise, set the real ids to the effective values (should be root unless run
3597 from inetd, which it can either be root or the exim uid, if one is configured).
3599 There is a private mechanism for bypassing some of this, in order to make it
3600 possible to test lots of configurations automatically, without having either to
3601 recompile each time, or to patch in an actual configuration file name and other
3602 values (such as the path name). If running in the test harness, pretend that
3603 configuration file changes and macro definitions haven't happened. */
3606 (!f.trusted_config || /* Config changed, or */
3607 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3608 real_uid != root_uid && /* Not root, and */
3609 !f.running_in_test_harness /* Not fudged */
3611 expansion_test /* expansion testing */
3613 filter_test != FTEST_NONE) /* Filter testing */
3615 setgroups(group_count, group_list);
3616 exim_setugid(real_uid, real_gid, FALSE,
3617 US"-C, -D, -be or -bf forces real uid");
3618 removed_privilege = TRUE;
3620 /* In the normal case when Exim is called like this, stderr is available
3621 and should be used for any logging information because attempts to write
3622 to the log will usually fail. To arrange this, we unset really_exim. However,
3623 if no stderr is available there is no point - we might as well have a go
3624 at the log (if it fails, syslog will be written).
3626 Note that if the invoker is Exim, the logs remain available. Messing with
3627 this causes unlogged successful deliveries. */
3629 if (log_stderr && real_uid != exim_uid)
3630 f.really_exim = FALSE;
3633 /* Privilege is to be retained for the moment. It may be dropped later,
3634 depending on the job that this Exim process has been asked to do. For now, set
3635 the real uid to the effective so that subsequent re-execs of Exim are done by a
3639 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3641 /* If testing a filter, open the file(s) now, before wasting time doing other
3642 setups and reading the message. */
3644 if (filter_test & FTEST_SYSTEM)
3645 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3646 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3649 if (filter_test & FTEST_USER)
3650 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3651 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3654 /* Initialise lookup_list
3655 If debugging, already called above via version reporting.
3656 In either case, we initialise the list of available lookups while running
3657 as root. All dynamically modules are loaded from a directory which is
3658 hard-coded into the binary and is code which, if not a module, would be
3659 part of Exim already. Ability to modify the content of the directory
3660 is equivalent to the ability to modify a setuid binary!
3662 This needs to happen before we read the main configuration. */
3666 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3669 /* Read the main runtime configuration data; this gives up if there
3670 is a failure. It leaves the configuration file open so that the subsequent
3671 configuration data for delivery can be read if needed.
3673 NOTE: immediately after opening the configuration file we change the working
3674 directory to "/"! Later we change to $spool_directory. We do it there, because
3675 during readconf_main() some expansion takes place already. */
3677 /* Store the initial cwd before we change directories. Can be NULL if the
3678 dir has already been unlinked. */
3679 initial_cwd = os_getcwd(NULL, 0);
3682 -be[m] expansion test -
3683 -b[fF] filter test new
3685 -bmalware malware_test_file new
3687 -brw rewrite test new
3689 -bv[s] address verify -
3691 -bP <option> (except -bP config, which sets list_config)
3693 If any of these options is set, we suppress warnings about configuration
3694 issues (currently about tls_advertise_hosts and keep_environment not being
3698 #ifdef MEASURE_TIMING
3699 struct timeval t0, diff;
3700 (void)gettimeofday(&t0, NULL);
3703 readconf_main(checking || list_options);
3705 #ifdef MEASURE_TIMING
3706 report_time_since(&t0, US"readconf_main (delta)");
3711 /* Now in directory "/" */
3713 if (cleanup_environment() == FALSE)
3714 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3717 /* If an action on specific messages is requested, or if a daemon or queue
3718 runner is being started, we need to know if Exim was called by an admin user.
3719 This is the case if the real user is root or exim, or if the real group is
3720 exim, or if one of the supplementary groups is exim or a group listed in
3721 admin_groups. We don't fail all message actions immediately if not admin_user,
3722 since some actions can be performed by non-admin users. Instead, set admin_user
3723 for later interrogation. */
3725 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3726 f.admin_user = TRUE;
3728 for (int i = 0; i < group_count && !f.admin_user; i++)
3729 if (group_list[i] == exim_gid)
3730 f.admin_user = TRUE;
3731 else if (admin_groups)
3732 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3733 if (admin_groups[j] == group_list[i])
3734 f.admin_user = TRUE;
3736 /* Another group of privileged users are the trusted users. These are root,
3737 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3738 are permitted to specify sender_addresses with -f on the command line, and
3739 other message parameters as well. */
3741 if (real_uid == root_uid || real_uid == exim_uid)
3742 f.trusted_caller = TRUE;
3746 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3747 if (trusted_users[i] == real_uid)
3748 f.trusted_caller = TRUE;
3751 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3752 if (trusted_groups[i] == real_gid)
3753 f.trusted_caller = TRUE;
3754 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3755 if (trusted_groups[i] == group_list[j])
3756 f.trusted_caller = TRUE;
3759 /* At this point, we know if the user is privileged and some command-line
3760 options become possibly impermissible, depending upon the configuration file. */
3762 if (checking && commandline_checks_require_admin && !f.admin_user)
3763 exim_fail("exim: those command-line flags are set to require admin\n");
3765 /* Handle the decoding of logging options. */
3767 decode_bits(log_selector, log_selector_size, log_notall,
3768 log_selector_string, log_options, log_options_count, US"log", 0);
3772 debug_printf("configuration file is %s\n", config_main_filename);
3773 debug_printf("log selectors =");
3774 for (int i = 0; i < log_selector_size; i++)
3775 debug_printf(" %08x", log_selector[i]);
3779 /* If domain literals are not allowed, check the sender address that was
3780 supplied with -f. Ditto for a stripped trailing dot. */
3784 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3785 exim_fail("exim: bad -f address \"%s\": domain literals not "
3786 "allowed\n", sender_address);
3787 if (f_end_dot && !strip_trailing_dot)
3788 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3789 "(trailing dot not allowed)\n", sender_address);
3792 /* See if an admin user overrode our logging. */
3794 if (cmdline_syslog_name)
3797 syslog_processname = cmdline_syslog_name;
3798 log_file_path = string_copy(CUS"syslog");
3801 /* not a panic, non-privileged users should not be able to spam paniclog */
3803 "exim: you lack sufficient privilege to specify syslog process name\n");
3805 /* Paranoia check of maximum lengths of certain strings. There is a check
3806 on the length of the log file path in log.c, which will come into effect
3807 if there are any calls to write the log earlier than this. However, if we
3808 get this far but the string is very long, it is better to stop now than to
3809 carry on and (e.g.) receive a message and then have to collapse. The call to
3810 log_write() from here will cause the ultimate panic collapse if the complete
3811 file name exceeds the buffer length. */
3813 if (Ustrlen(log_file_path) > 200)
3814 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3815 "log_file_path is longer than 200 chars: aborting");
3817 if (Ustrlen(pid_file_path) > 200)
3818 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3819 "pid_file_path is longer than 200 chars: aborting");
3821 if (Ustrlen(spool_directory) > 200)
3822 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3823 "spool_directory is longer than 200 chars: aborting");
3825 /* Length check on the process name given to syslog for its TAG field,
3826 which is only permitted to be 32 characters or less. See RFC 3164. */
3828 if (Ustrlen(syslog_processname) > 32)
3829 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3830 "syslog_processname is longer than 32 chars: aborting");
3835 log_write(0, LOG_MAIN, "%s", log_oneline);
3836 return EXIT_SUCCESS;
3839 return EXIT_FAILURE;
3841 /* In some operating systems, the environment variable TMPDIR controls where
3842 temporary files are created; Exim doesn't use these (apart from when delivering
3843 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3844 If TMPDIR is found in the environment, reset it to the value defined in the
3845 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3846 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3847 EXIM_TMPDIR by the build scripts.
3851 if (environ) for (uschar ** p = USS environ; *p; p++)
3852 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3854 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3855 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3857 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3861 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3862 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3863 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3864 called by a user who has set the TZ variable. This then affects the timestamps
3865 in log files and in Received: headers, and any created Date: header lines. The
3866 required timezone is settable in the configuration file, so nothing can be done
3867 about this earlier - but hopefully nothing will normally be logged earlier than
3868 this. We have to make a new environment if TZ is wrong, but don't bother if
3869 timestamps_utc is set, because then all times are in UTC anyway. */
3871 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3872 f.timestamps_utc = TRUE;
3875 uschar *envtz = US getenv("TZ");
3877 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3878 : timezone_string != NULL
3881 uschar **p = USS environ;
3885 if (environ) while (*p++) count++;
3886 if (!envtz) count++;
3887 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3888 if (environ) for (p = USS environ; *p; p++)
3889 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3890 if (timezone_string)
3892 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3893 sprintf(CS *newp++, "TZ=%s", timezone_string);
3898 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3899 tod_stamp(tod_log));
3903 /* Handle the case when we have removed the setuid privilege because of -C or
3904 -D. This means that the caller of Exim was not root.
3906 There is a problem if we were running as the Exim user. The sysadmin may
3907 expect this case to retain privilege because "the binary was called by the
3908 Exim user", but it hasn't, because either the -D option set macros, or the
3909 -C option set a non-trusted configuration file. There are two possibilities:
3911 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3912 to do message deliveries. Thus, the fact that it is running as a
3913 non-privileged user is plausible, and might be wanted in some special
3914 configurations. However, really_exim will have been set false when
3915 privilege was dropped, to stop Exim trying to write to its normal log
3916 files. Therefore, re-enable normal log processing, assuming the sysadmin
3917 has set up the log directory correctly.
3919 (2) If deliver_drop_privilege is not set, the configuration won't work as
3920 apparently intended, and so we log a panic message. In order to retain
3921 root for -C or -D, the caller must either be root or be invoking a
3922 trusted configuration file (when deliver_drop_privilege is false). */
3924 if ( removed_privilege
3925 && (!f.trusted_config || opt_D_used)
3926 && real_uid == exim_uid)
3927 if (deliver_drop_privilege)
3928 f.really_exim = TRUE; /* let logging work normally */
3930 log_write(0, LOG_MAIN|LOG_PANIC,
3931 "exim user lost privilege for using %s option",
3932 f.trusted_config? "-D" : "-C");
3934 /* Start up Perl interpreter if Perl support is configured and there is a
3935 perl_startup option, and the configuration or the command line specifies
3936 initializing starting. Note that the global variables are actually called
3937 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3940 if (perl_start_option != 0)
3941 opt_perl_at_start = (perl_start_option > 0);
3942 if (opt_perl_at_start && opt_perl_startup != NULL)
3945 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3946 if ((errstr = init_perl(opt_perl_startup)))
3947 exim_fail("exim: error in perl_startup code: %s\n", errstr);
3948 opt_perl_started = TRUE;
3950 #endif /* EXIM_PERL */
3952 /* Log the arguments of the call if the configuration file said so. This is
3953 a debugging feature for finding out what arguments certain MUAs actually use.
3954 Don't attempt it if logging is disabled, or if listing variables or if
3955 verifying/testing addresses or expansions. */
3957 if ( (debug_selector & D_any || LOGGING(arguments))
3958 && f.really_exim && !list_options && !checking)
3960 uschar *p = big_buffer;
3961 Ustrcpy(p, US"cwd= (failed)");
3967 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3968 p += 4 + Ustrlen(initial_cwd);
3969 /* in case p is near the end and we don't provide enough space for
3970 * string_format to be willing to write. */
3974 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3976 for (int i = 0; i < argc; i++)
3978 int len = Ustrlen(argv[i]);
3979 const uschar *printing;
3981 if (p + len + 8 >= big_buffer + big_buffer_size)
3983 Ustrcpy(p, US" ...");
3984 log_write(0, LOG_MAIN, "%s", big_buffer);
3985 Ustrcpy(big_buffer, US"...");
3988 printing = string_printing(argv[i]);
3989 if (printing[0] == 0) quote = US"\""; else
3991 const uschar *pp = printing;
3993 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3995 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3996 (p - big_buffer) - 4), printing, quote);
3999 if (LOGGING(arguments))
4000 log_write(0, LOG_MAIN, "%s", big_buffer);
4002 debug_printf("%s\n", big_buffer);
4005 /* Set the working directory to be the top-level spool directory. We don't rely
4006 on this in the code, which always uses fully qualified names, but it's useful
4007 for core dumps etc. Don't complain if it fails - the spool directory might not
4008 be generally accessible and calls with the -C option (and others) have lost
4009 privilege by now. Before the chdir, we try to ensure that the directory exists.
4012 if (Uchdir(spool_directory) != 0)
4015 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4016 dummy = /* quieten compiler */ Uchdir(spool_directory);
4017 dummy = dummy; /* yet more compiler quietening, sigh */
4020 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4021 alias file. Exim doesn't have such a concept, but this call is screwed into
4022 Sun's YP makefiles. Handle this by calling a configured script, as the real
4023 user who called Exim. The -oA option can be used to pass an argument to the
4028 (void)fclose(config_file);
4029 if (bi_command != NULL)
4033 argv[i++] = bi_command;
4034 if (alias_arg != NULL) argv[i++] = alias_arg;
4037 setgroups(group_count, group_list);
4038 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4040 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4041 (argv[1] == NULL)? US"" : argv[1]);
4043 execv(CS argv[0], (char *const *)argv);
4044 exim_fail("exim: exec failed: %s\n", strerror(errno));
4048 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4053 /* We moved the admin/trusted check to be immediately after reading the
4054 configuration file. We leave these prints here to ensure that syslog setup,
4055 logfile setup, and so on has already happened. */
4057 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4058 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4060 /* Only an admin user may start the daemon or force a queue run in the default
4061 configuration, but the queue run restriction can be relaxed. Only an admin
4062 user may request that a message be returned to its sender forthwith. Only an
4063 admin user may specify a debug level greater than D_v (because it might show
4064 passwords, etc. in lookup queries). Only an admin user may request a queue
4065 count. Only an admin user can use the test interface to scan for email
4066 (because Exim will be in the spool dir and able to look at mails). */
4070 BOOL debugset = (debug_selector & ~D_v) != 0;
4071 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4072 (count_queue && queue_list_requires_admin) ||
4073 (list_queue && queue_list_requires_admin) ||
4074 (queue_interval >= 0 && prod_requires_admin) ||
4075 (debugset && !f.running_in_test_harness))
4076 exim_fail("exim:%s permission denied\n", debugset? " debugging" : "");
4079 /* If the real user is not root or the exim uid, the argument for passing
4080 in an open TCP/IP connection for another message is not permitted, nor is
4081 running with the -N option for any delivery action, unless this call to exim is
4082 one that supplied an input message, or we are using a patched exim for
4083 regression testing. */
4085 if (real_uid != root_uid && real_uid != exim_uid &&
4086 (continue_hostname != NULL ||
4088 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4089 )) && !f.running_in_test_harness)
4090 exim_fail("exim: Permission denied\n");
4092 /* If the caller is not trusted, certain arguments are ignored when running for
4093 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4094 Note that authority for performing certain actions on messages is tested in the
4095 queue_action() function. */
4097 if (!f.trusted_caller && !checking)
4099 sender_host_name = sender_host_address = interface_address =
4100 sender_ident = received_protocol = NULL;
4101 sender_host_port = interface_port = 0;
4102 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4105 /* If a sender host address is set, extract the optional port number off the
4106 end of it and check its syntax. Do the same thing for the interface address.
4107 Exim exits if the syntax is bad. */
4111 if (sender_host_address != NULL)
4112 sender_host_port = check_port(sender_host_address);
4113 if (interface_address != NULL)
4114 interface_port = check_port(interface_address);
4117 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4120 if (f.trusted_caller)
4122 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4123 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4126 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4129 /* If an SMTP message is being received check to see if the standard input is a
4130 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4131 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4136 union sockaddr_46 inetd_sock;
4137 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4138 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4140 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4141 if (family == AF_INET || family == AF_INET6)
4143 union sockaddr_46 interface_sock;
4144 size = sizeof(interface_sock);
4146 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4147 interface_address = host_ntoa(-1, &interface_sock, NULL,
4150 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4152 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4155 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4156 NULL, &sender_host_port);
4157 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4158 "inetd is not supported when mua_wrapper is set");
4162 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4167 /* If the load average is going to be needed while receiving a message, get it
4168 now for those OS that require the first call to os_getloadavg() to be done as
4169 root. There will be further calls later for each message received. */
4171 #ifdef LOAD_AVG_NEEDS_ROOT
4172 if (receiving_message &&
4173 (queue_only_load >= 0 ||
4174 (f.is_inetd && smtp_load_reserve >= 0)
4177 load_average = OS_GETLOADAVG();
4181 /* The queue_only configuration option can be overridden by -odx on the command
4182 line, except that if queue_only_override is false, queue_only cannot be unset
4183 from the command line. */
4185 if (queue_only_set && (queue_only_override || arg_queue_only))
4186 queue_only = arg_queue_only;
4188 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4191 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4192 if (arg_smtp_receive_timeout >= 0)
4193 smtp_receive_timeout = arg_smtp_receive_timeout;
4195 /* If Exim was started with root privilege, unless we have already removed the
4196 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4197 except when starting the daemon or doing some kind of delivery or address
4198 testing (-bt). These are the only cases when root need to be retained. We run
4199 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4200 retained only for starting the daemon. We always do the initgroups() in this
4201 situation (controlled by the TRUE below), in order to be as close as possible
4202 to the state Exim usually runs in. */
4204 if (!unprivileged && /* originally had root AND */
4205 !removed_privilege && /* still got root AND */
4206 !f.daemon_listen && /* not starting the daemon */
4207 queue_interval <= 0 && /* (either kind of daemon) */
4209 deliver_drop_privilege || /* requested unprivileged */
4211 queue_interval < 0 && /* not running the queue */
4212 (msg_action_arg < 0 || /* and */
4213 msg_action != MSG_DELIVER) && /* not delivering and */
4214 (!checking || !f.address_test_mode) /* not address checking */
4216 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4218 /* When we are retaining a privileged uid, we still change to the exim gid. */
4223 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4224 rv = setgid(exim_gid);
4225 /* Impact of failure is that some stuff might end up with an incorrect group.
4226 We track this for failures from root, since any attempt to change privilege
4227 by root should succeed and failures should be examined. For non-root,
4228 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4229 no need to complain then. */
4231 if (!(unprivileged || removed_privilege))
4232 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4234 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4235 (long int)exim_gid, strerror(errno));
4238 /* Handle a request to scan a file for malware */
4239 if (malware_test_file)
4241 #ifdef WITH_CONTENT_SCAN
4243 set_process_info("scanning file for malware");
4244 result = malware_in_file(malware_test_file);
4247 printf("No malware found.\n");
4252 printf("Malware lookup returned non-okay/fail: %d\n", result);
4256 printf("Malware found: %s\n", malware_name);
4258 printf("Malware scan detected malware of unknown name.\n");
4260 printf("Malware scanning not enabled at compile time.\n");
4265 /* Handle a request to list the delivery queue */
4269 set_process_info("listing the queue");
4270 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4274 /* Handle a request to count the delivery queue */
4278 set_process_info("counting the queue");
4283 /* Handle actions on specific messages, except for the force delivery and
4284 message load actions, which are done below. Some actions take a whole list of
4285 message ids, which are known to continue up to the end of the arguments. Others
4286 take a single message id and then operate on the recipients list. */
4288 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4290 int yield = EXIT_SUCCESS;
4291 set_process_info("acting on specified messages");
4293 /* ACL definitions may be needed when removing a message (-Mrm) because
4294 event_action gets expanded */
4296 if (msg_action == MSG_REMOVE)
4299 if (!one_msg_action)
4301 for (i = msg_action_arg; i < argc; i++)
4302 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4303 yield = EXIT_FAILURE;
4306 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4307 recipients_arg)) yield = EXIT_FAILURE;
4311 /* We used to set up here to skip reading the ACL section, on
4312 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4313 Now, since the intro of the ${acl } expansion, ACL definitions may be
4314 needed in transports so we lost the optimisation. */
4317 #ifdef MEASURE_TIMING
4318 struct timeval t0, diff;
4319 (void)gettimeofday(&t0, NULL);
4324 #ifdef MEASURE_TIMING
4325 report_time_since(&t0, US"readconf_rest (delta)");
4329 /* Handle the -brt option. This is for checking out retry configurations.
4330 The next three arguments are a domain name or a complete address, and
4331 optionally two error numbers. All it does is to call the function that
4332 scans the retry configuration data. */
4334 if (test_retry_arg >= 0)
4336 retry_config *yield;
4337 int basic_errno = 0;
4341 if (test_retry_arg >= argc)
4343 printf("-brt needs a domain or address argument\n");
4344 exim_exit(EXIT_FAILURE, US"main");
4346 s1 = argv[test_retry_arg++];
4349 /* If the first argument contains no @ and no . it might be a local user
4350 or it might be a single-component name. Treat as a domain. */
4352 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4354 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4355 "being \ntreated as a one-component domain, not as a local part.\n\n",
4359 /* There may be an optional second domain arg. */
4361 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4362 s2 = argv[test_retry_arg++];
4364 /* The final arg is an error name */
4366 if (test_retry_arg < argc)
4368 uschar *ss = argv[test_retry_arg];
4370 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4373 printf("%s\n", CS error);
4374 return EXIT_FAILURE;
4377 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4378 code > 100 as an error is for matching codes to the decade. Turn them into
4379 a real error code, off the decade. */
4381 if (basic_errno == ERRNO_MAIL4XX ||
4382 basic_errno == ERRNO_RCPT4XX ||
4383 basic_errno == ERRNO_DATA4XX)
4385 int code = (more_errno >> 8) & 255;
4387 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4388 else if (code > 100)
4389 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4393 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4394 printf("No retry information found\n");
4397 more_errno = yield->more_errno;
4398 printf("Retry rule: %s ", yield->pattern);
4400 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4402 printf("quota%s%s ",
4403 (more_errno > 0)? "_" : "",
4404 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4406 else if (yield->basic_errno == ECONNREFUSED)
4408 printf("refused%s%s ",
4409 (more_errno > 0)? "_" : "",
4410 (more_errno == 'M')? "MX" :
4411 (more_errno == 'A')? "A" : "");
4413 else if (yield->basic_errno == ETIMEDOUT)
4416 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4418 if (more_errno != 0) printf("_%s",
4419 (more_errno == 'M')? "MX" : "A");
4422 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4423 printf("auth_failed ");
4426 for (retry_rule * r = yield->rules; r; r = r->next)
4428 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4429 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4435 printf(",%d.", x/1000);
4449 exim_exit(EXIT_SUCCESS, US"main");
4452 /* Handle a request to list one or more configuration options */
4453 /* If -n was set, we suppress some information */
4458 set_process_info("listing variables");
4459 if (recipients_arg >= argc)
4460 fail = !readconf_print(US"all", NULL, flag_n);
4461 else for (i = recipients_arg; i < argc; i++)
4464 (Ustrcmp(argv[i], "router") == 0 ||
4465 Ustrcmp(argv[i], "transport") == 0 ||
4466 Ustrcmp(argv[i], "authenticator") == 0 ||
4467 Ustrcmp(argv[i], "macro") == 0 ||
4468 Ustrcmp(argv[i], "environment") == 0))
4470 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4474 fail = !readconf_print(argv[i], NULL, flag_n);
4476 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4481 set_process_info("listing config");
4482 exim_exit(readconf_print(US"config", NULL, flag_n)
4483 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4487 /* Initialise subsystems as required. */
4491 /* Handle a request to deliver one or more messages that are already on the
4492 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4493 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4495 Delivery of specific messages is typically used for a small number when
4496 prodding by hand (when the option forced_delivery will be set) or when
4497 re-execing to regain root privilege. Each message delivery must happen in a
4498 separate process, so we fork a process for each one, and run them sequentially
4499 so that debugging output doesn't get intertwined, and to avoid spawning too
4500 many processes if a long list is given. However, don't fork for the last one;
4501 this saves a process in the common case when Exim is called to deliver just one
4504 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4506 if (prod_requires_admin && !f.admin_user)
4508 fprintf(stderr, "exim: Permission denied\n");
4509 exim_exit(EXIT_FAILURE, US"main");
4511 set_process_info("delivering specified messages");
4512 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4513 for (i = msg_action_arg; i < argc; i++)
4518 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4519 else if ((pid = fork()) == 0)
4521 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4522 exim_underbar_exit(EXIT_SUCCESS);
4526 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4528 exim_exit(EXIT_FAILURE, US"main");
4532 exim_exit(EXIT_SUCCESS, US"main");
4536 /* If only a single queue run is requested, without SMTP listening, we can just
4537 turn into a queue runner, with an optional starting message id. */
4539 if (queue_interval == 0 && !f.daemon_listen)
4541 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4542 (start_queue_run_id == NULL)? US"" : US" starting at ",
4543 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4544 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4545 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4547 set_process_info("running the '%s' queue (single queue run)", queue_name);
4549 set_process_info("running the queue (single queue run)");
4550 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4551 exim_exit(EXIT_SUCCESS, US"main");
4555 /* Find the login name of the real user running this process. This is always
4556 needed when receiving a message, because it is written into the spool file. It
4557 may also be used to construct a from: or a sender: header, and in this case we
4558 need the user's full name as well, so save a copy of it, checked for RFC822
4559 syntax and munged if necessary, if it hasn't previously been set by the -F
4560 argument. We may try to get the passwd entry more than once, in case NIS or
4561 other delays are in evidence. Save the home directory for use in filter testing
4566 if ((pw = getpwuid(real_uid)) != NULL)
4568 originator_login = string_copy(US pw->pw_name);
4569 originator_home = string_copy(US pw->pw_dir);
4571 /* If user name has not been set by -F, set it from the passwd entry
4572 unless -f has been used to set the sender address by a trusted user. */
4574 if (!originator_name)
4576 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4578 uschar *name = US pw->pw_gecos;
4579 uschar *amp = Ustrchr(name, '&');
4582 /* Most Unix specify that a '&' character in the gecos field is
4583 replaced by a copy of the login name, and some even specify that
4584 the first character should be upper cased, so that's what we do. */
4589 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4590 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4591 buffer[loffset] = toupper(buffer[loffset]);
4595 /* If a pattern for matching the gecos field was supplied, apply
4596 it and then expand the name string. */
4598 if (gecos_pattern && gecos_name)
4601 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4603 if (regex_match_and_setup(re, name, 0, -1))
4605 uschar *new_name = expand_string(gecos_name);
4609 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4610 "gecos field \"%s\"\n", new_name, name);
4613 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4614 "\"%s\": %s\n", gecos_name, expand_string_message);
4616 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4617 "gecos field \"%s\"\n", gecos_pattern, name);
4618 store_free((void *)re);
4620 originator_name = string_copy(name);
4623 /* A trusted caller has used -f but not -F */
4625 else originator_name = US"";
4628 /* Break the retry loop */
4633 if (++i > finduser_retries) break;
4637 /* If we cannot get a user login, log the incident and give up, unless the
4638 configuration specifies something to use. When running in the test harness,
4639 any setting of unknown_login overrides the actual name. */
4641 if (originator_login == NULL || f.running_in_test_harness)
4643 if (unknown_login != NULL)
4645 originator_login = expand_string(unknown_login);
4646 if (originator_name == NULL && unknown_username != NULL)
4647 originator_name = expand_string(unknown_username);
4648 if (originator_name == NULL) originator_name = US"";
4650 if (originator_login == NULL)
4651 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4655 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4658 originator_name = string_copy(parse_fix_phrase(originator_name,
4659 Ustrlen(originator_name), big_buffer, big_buffer_size));
4661 /* If a message is created by this call of Exim, the uid/gid of its originator
4662 are those of the caller. These values are overridden if an existing message is
4663 read in from the spool. */
4665 originator_uid = real_uid;
4666 originator_gid = real_gid;
4668 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4669 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4671 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4672 returns. We leave this till here so that the originator_ fields are available
4673 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4676 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4680 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4681 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4682 "mua_wrapper is set");
4685 # ifndef DISABLE_TLS
4686 /* This also checks that the library linkage is working and we can call
4687 routines in it, so call even if tls_require_ciphers is unset */
4689 # ifdef MEASURE_TIMING
4690 struct timeval t0, diff;
4691 (void)gettimeofday(&t0, NULL);
4693 if (!tls_dropprivs_validate_require_cipher(FALSE))
4695 # ifdef MEASURE_TIMING
4696 report_time_since(&t0, US"validate_ciphers (delta)");
4704 /* If the sender ident has not been set (by a trusted caller) set it to
4705 the caller. This will get overwritten below for an inetd call. If a trusted
4706 caller has set it empty, unset it. */
4708 if (!sender_ident) sender_ident = originator_login;
4709 else if (!*sender_ident) sender_ident = NULL;
4711 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4712 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4713 originator_* variables set. */
4715 if (test_rewrite_arg >= 0)
4717 f.really_exim = FALSE;
4718 if (test_rewrite_arg >= argc)
4720 printf("-brw needs an address argument\n");
4721 exim_exit(EXIT_FAILURE, US"main");
4723 rewrite_test(argv[test_rewrite_arg]);
4724 exim_exit(EXIT_SUCCESS, US"main");
4727 /* A locally-supplied message is considered to be coming from a local user
4728 unless a trusted caller supplies a sender address with -f, or is passing in the
4729 message via SMTP (inetd invocation or otherwise). */
4731 if ( !sender_address && !smtp_input
4732 || !f.trusted_caller && filter_test == FTEST_NONE)
4734 f.sender_local = TRUE;
4736 /* A trusted caller can supply authenticated_sender and authenticated_id
4737 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4738 defaults except when host checking. */
4740 if (!authenticated_sender && !host_checking)
4741 authenticated_sender = string_sprintf("%s@%s", originator_login,
4742 qualify_domain_sender);
4743 if (!authenticated_id && !host_checking)
4744 authenticated_id = originator_login;
4747 /* Trusted callers are always permitted to specify the sender address.
4748 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4749 is specified is the empty address. However, if a trusted caller does not
4750 specify a sender address for SMTP input, we leave sender_address unset. This
4751 causes the MAIL commands to be honoured. */
4753 if ( !smtp_input && !sender_address
4754 || !receive_check_set_sender(sender_address))
4756 /* Either the caller is not permitted to set a general sender, or this is
4757 non-SMTP input and the trusted caller has not set a sender. If there is no
4758 sender, or if a sender other than <> is set, override with the originator's
4759 login (which will get qualified below), except when checking things. */
4761 if (sender_address == NULL /* No sender_address set */
4763 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4764 !checking)) /* Not running tests, including filter tests */
4766 sender_address = originator_login;
4767 f.sender_address_forced = FALSE;
4768 sender_address_domain = 0;
4772 /* Remember whether an untrusted caller set the sender address */
4774 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4776 /* Ensure that the sender address is fully qualified unless it is the empty
4777 address, which indicates an error message, or doesn't exist (root caller, smtp
4778 interface, no -f argument). */
4780 if (sender_address && *sender_address && sender_address_domain == 0)
4781 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4782 qualify_domain_sender);
4784 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4786 /* Handle a request to verify a list of addresses, or test them for delivery.
4787 This must follow the setting of the sender address, since routers can be
4788 predicated upon the sender. If no arguments are given, read addresses from
4789 stdin. Set debug_level to at least D_v to get full output for address testing.
4792 if (verify_address_mode || f.address_test_mode)
4795 int flags = vopt_qualify;
4797 if (verify_address_mode)
4799 if (!verify_as_sender) flags |= vopt_is_recipient;
4800 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4805 flags |= vopt_is_recipient;
4806 debug_selector |= D_v;
4807 debug_file = stderr;
4808 debug_fd = fileno(debug_file);
4809 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4812 if (recipients_arg < argc)
4814 while (recipients_arg < argc)
4816 /* Supplied addresses are tainted since they come from a user */
4817 uschar * s = string_copy_taint(argv[recipients_arg++], TRUE);
4820 BOOL finished = FALSE;
4821 uschar *ss = parse_find_address_end(s, FALSE);
4822 if (*ss == ',') *ss = 0; else finished = TRUE;
4823 test_address(s, flags, &exit_value);
4826 while (*++s == ',' || isspace(*s)) ;
4833 uschar * s = get_stdinput(NULL, NULL);
4835 test_address(string_copy_taint(s, TRUE), flags, &exit_value);
4839 exim_exit(exit_value, US"main");
4842 /* Handle expansion checking. Either expand items on the command line, or read
4843 from stdin if there aren't any. If -Mset was specified, load the message so
4844 that its variables can be used, but restrict this facility to admin users.
4845 Otherwise, if -bem was used, read a message from stdin. */
4849 dns_init(FALSE, FALSE, FALSE);
4850 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4852 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4854 exim_fail("exim: permission denied\n");
4855 message_id = argv[msg_action_arg];
4856 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4857 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4858 printf ("Failed to load message datafile %s\n", message_id);
4859 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4860 printf ("Failed to load message %s\n", message_id);
4863 /* Read a test message from a file. We fudge it up to be on stdin, saving
4864 stdin itself for later reading of expansion strings. */
4866 else if (expansion_test_message)
4868 int save_stdin = dup(0);
4869 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4871 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
4874 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4875 message_ended = END_NOTENDED;
4876 read_message_body(receive_msg(extract_recipients));
4877 message_linecount += body_linecount;
4878 (void)dup2(save_stdin, 0);
4879 (void)close(save_stdin);
4880 clearerr(stdin); /* Required by Darwin */
4883 /* Only admin users may see config-file macros this way */
4885 if (!f.admin_user) macros_user = macros = mlast = NULL;
4887 /* Allow $recipients for this testing */
4889 f.enable_dollar_recipients = TRUE;
4891 /* Expand command line items */
4893 if (recipients_arg < argc)
4894 while (recipients_arg < argc)
4895 expansion_test_line(argv[recipients_arg++]);
4901 char *(*fn_readline)(const char *) = NULL;
4902 void (*fn_addhist)(const char *) = NULL;
4906 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4909 while (s = get_stdinput(fn_readline, fn_addhist))
4910 expansion_test_line(s);
4913 if (dlhandle) dlclose(dlhandle);
4917 /* The data file will be open after -Mset */
4919 if (deliver_datafile >= 0)
4921 (void)close(deliver_datafile);
4922 deliver_datafile = -1;
4925 exim_exit(EXIT_SUCCESS, US"main: expansion test");
4929 /* The active host name is normally the primary host name, but it can be varied
4930 for hosts that want to play several parts at once. We need to ensure that it is
4931 set for host checking, and for receiving messages. */
4933 smtp_active_hostname = primary_hostname;
4934 if (raw_active_hostname != NULL)
4936 uschar *nah = expand_string(raw_active_hostname);
4939 if (!f.expand_string_forcedfail)
4940 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4941 "(smtp_active_hostname): %s", raw_active_hostname,
4942 expand_string_message);
4944 else if (nah[0] != 0) smtp_active_hostname = nah;
4947 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4948 given IP address so that the blocking and relay configuration can be tested.
4949 Unless a sender_ident was set by -oMt, we discard it (the default is the
4950 caller's login name). An RFC 1413 call is made only if we are running in the
4951 test harness and an incoming interface and both ports are specified, because
4952 there is no TCP/IP call to find the ident for. */
4959 if (!sender_ident_set)
4961 sender_ident = NULL;
4962 if (f.running_in_test_harness && sender_host_port != 0 &&
4963 interface_address != NULL && interface_port != 0)
4964 verify_get_ident(1413);
4967 /* In case the given address is a non-canonical IPv6 address, canonicalize
4968 it. The code works for both IPv4 and IPv6, as it happens. */
4970 size = host_aton(sender_host_address, x);
4971 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
4972 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4974 /* Now set up for testing */
4976 host_build_sender_fullhost();
4980 f.sender_local = FALSE;
4981 f.sender_host_notsocket = TRUE;
4982 debug_file = stderr;
4983 debug_fd = fileno(debug_file);
4984 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4985 "**** but without any ident (RFC 1413) callback.\n"
4986 "**** This is not for real!\n\n",
4987 sender_host_address);
4989 memset(sender_host_cache, 0, sizeof(sender_host_cache));
4990 if (verify_check_host(&hosts_connection_nolog) == OK)
4991 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
4992 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4994 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4995 because a log line has already been written for all its failure exists
4996 (usually "connection refused: <reason>") and writing another one is
4997 unnecessary clutter. */
4999 if (smtp_start_session())
5001 for (; (reset_point = store_mark()); store_reset(reset_point))
5003 if (smtp_setup_msg() <= 0) break;
5004 if (!receive_msg(FALSE)) break;
5006 return_path = sender_address = NULL;
5007 dnslist_domain = dnslist_matched = NULL;
5008 #ifndef DISABLE_DKIM
5009 dkim_cur_signer = NULL;
5012 deliver_localpart_orig = NULL;
5013 deliver_domain_orig = NULL;
5014 callout_address = sending_ip_address = NULL;
5015 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5019 exim_exit(EXIT_SUCCESS, US"main");
5023 /* Arrange for message reception if recipients or SMTP were specified;
5024 otherwise complain unless a version print (-bV) happened or this is a filter
5025 verification test or info dump.
5026 In the former case, show the configuration file name. */
5028 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5030 if (version_printed)
5032 if (Ustrchr(config_main_filelist, ':'))
5033 printf("Configuration file search path is %s\n", config_main_filelist);
5034 printf("Configuration file is %s\n", config_main_filename);
5035 return EXIT_SUCCESS;
5038 if (info_flag != CMDINFO_NONE)
5040 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5041 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5044 if (filter_test == FTEST_NONE)
5045 exim_usage(called_as);
5049 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5050 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5051 that we are not called from inetd, because that is rejected above. The
5052 following configuration settings are forced here:
5054 (1) Synchronous delivery (-odi)
5055 (2) Errors to stderr (-oep == -oeq)
5056 (3) No parallel remote delivery
5057 (4) Unprivileged delivery
5059 We don't force overall queueing options because there are several of them;
5060 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5061 to override any SMTP queueing. */
5065 f.synchronous_delivery = TRUE;
5066 arg_error_handling = ERRORS_STDERR;
5067 remote_max_parallel = 1;
5068 deliver_drop_privilege = TRUE;
5069 f.queue_smtp = FALSE;
5070 queue_smtp_domains = NULL;
5072 message_utf8_downconvert = -1; /* convert-if-needed */
5077 /* Prepare to accept one or more new messages on the standard input. When a
5078 message has been read, its id is returned in message_id[]. If doing immediate
5079 delivery, we fork a delivery process for each received message, except for the
5080 last one, where we can save a process switch.
5082 It is only in non-smtp mode that error_handling is allowed to be changed from
5083 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5084 sendmail error modes other than -oem ever actually used? Later: yes.) */
5086 if (!smtp_input) error_handling = arg_error_handling;
5088 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5089 logging being sent down the socket and make an identd call to get the
5092 else if (f.is_inetd)
5094 (void)fclose(stderr);
5095 exim_nullstd(); /* Re-open to /dev/null */
5096 verify_get_ident(IDENT_PORT);
5097 host_build_sender_fullhost();
5098 set_process_info("handling incoming connection from %s via inetd",
5102 /* If the sender host address has been set, build sender_fullhost if it hasn't
5103 already been done (which it will have been for inetd). This caters for the
5104 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5105 so that the test for IP options is skipped for -bs input. */
5107 if (sender_host_address && !sender_fullhost)
5109 host_build_sender_fullhost();
5110 set_process_info("handling incoming connection from %s via -oMa",
5112 f.sender_host_notsocket = TRUE;
5115 /* Otherwise, set the sender host as unknown except for inetd calls. This
5116 prevents host checking in the case of -bs not from inetd and also for -bS. */
5118 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5120 /* If stdout does not exist, then dup stdin to stdout. This can happen
5121 if exim is started from inetd. In this case fd 0 will be set to the socket,
5122 but fd 1 will not be set. This also happens for passed SMTP channels. */
5124 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5126 /* Set up the incoming protocol name and the state of the program. Root is
5127 allowed to force received protocol via the -oMr option above. If we have come
5128 via inetd, the process info has already been set up. We don't set
5129 received_protocol here for smtp input, as it varies according to
5130 batch/HELO/EHLO/AUTH/TLS. */
5134 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5135 smtp_batched_input? "batched " : "",
5136 (sender_address!= NULL)? sender_address : originator_login);
5140 int old_pool = store_pool;
5141 store_pool = POOL_PERM;
5142 if (!received_protocol)
5143 received_protocol = string_sprintf("local%s", called_as);
5144 store_pool = old_pool;
5145 set_process_info("accepting a local non-SMTP message from <%s>",
5149 /* Initialize the session_local_queue-only flag (this will be ignored if
5150 mua_wrapper is set) */
5153 session_local_queue_only = queue_only;
5155 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5156 the spool if so configured. On failure, we must not attempt to send an error
5157 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5158 error code is given.) */
5160 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5161 exim_fail("exim: insufficient disk space\n");
5163 /* If this is smtp input of any kind, real or batched, handle the start of the
5166 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5167 because a log line has already been written for all its failure exists
5168 (usually "connection refused: <reason>") and writing another one is
5169 unnecessary clutter. */
5175 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5176 if (verify_check_host(&hosts_connection_nolog) == OK)
5177 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5178 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5179 if (!smtp_start_session())
5182 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5186 /* Otherwise, set up the input size limit here. */
5190 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5191 if (expand_string_message)
5192 if (thismessage_size_limit == -1)
5193 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5194 "message_size_limit: %s", expand_string_message);
5196 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5197 "message_size_limit: %s", expand_string_message);
5200 /* Loop for several messages when reading SMTP input. If we fork any child
5201 processes, we don't want to wait for them unless synchronous delivery is
5202 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5203 same as SIG_DFL, despite the fact that documentation often lists the default as
5204 "ignore". This is a confusing area. This is what I know:
5206 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5207 processes that complete simply to go away without ever becoming defunct. You
5208 can't then wait for them - but we don't want to wait for them in the
5209 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5210 happen for all OS (e.g. *BSD is different).
5212 But that's not the end of the story. Some (many? all?) systems have the
5213 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5214 has by default, so it seems that the difference is merely one of default
5215 (compare restarting vs non-restarting signals).
5217 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5218 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5219 of the loop below. Paranoia rules.
5221 February 2003: That's *still* not the end of the story. There are now versions
5222 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5223 process then calls waitpid(), a grumble is written to the system log, because
5224 this is logically inconsistent. In other words, it doesn't like the paranoia.
5225 As a consequence of this, the waitpid() below is now excluded if we are sure
5226 that SIG_IGN works. */
5228 if (!f.synchronous_delivery)
5231 struct sigaction act;
5232 act.sa_handler = SIG_IGN;
5233 sigemptyset(&(act.sa_mask));
5234 act.sa_flags = SA_NOCLDWAIT;
5235 sigaction(SIGCHLD, &act, NULL);
5237 signal(SIGCHLD, SIG_IGN);
5241 /* Save the current store pool point, for resetting at the start of
5242 each message, and save the real sender address, if any. */
5244 real_sender_address = sender_address;
5246 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5247 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5252 reset_point = store_mark();
5255 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5256 input and build the recipients list, before calling receive_msg() to read the
5257 message proper. Whatever sender address is given in the SMTP transaction is
5258 often ignored for local senders - we use the actual sender, which is normally
5259 either the underlying user running this process or a -f argument provided by
5260 a trusted caller. It is saved in real_sender_address. The test for whether to
5261 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5266 if ((rc = smtp_setup_msg()) > 0)
5268 if (real_sender_address != NULL &&
5269 !receive_check_set_sender(sender_address))
5271 sender_address = raw_sender = real_sender_address;
5272 sender_address_unrewritten = NULL;
5275 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5276 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5277 the very end. The result of the ACL is ignored (as for other non-SMTP
5278 messages). It is run for its potential side effects. */
5280 if (smtp_batched_input && acl_not_smtp_start != NULL)
5282 uschar *user_msg, *log_msg;
5283 f.enable_dollar_recipients = TRUE;
5284 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5285 &user_msg, &log_msg);
5286 f.enable_dollar_recipients = FALSE;
5289 /* Now get the data for the message */
5291 more = receive_msg(extract_recipients);
5292 if (message_id[0] == 0)
5294 cancel_cutthrough_connection(TRUE, US"receive dropped");
5295 if (more) goto moreloop;
5296 smtp_log_no_mail(); /* Log no mail if configured */
5297 exim_exit(EXIT_FAILURE, US"receive toplevel");
5302 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5303 smtp_log_no_mail(); /* Log no mail if configured */
5304 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5308 /* In the non-SMTP case, we have all the information from the command
5309 line, but must process it in case it is in the more general RFC822
5310 format, and in any case, to detect syntax errors. Also, it appears that
5311 the use of comma-separated lists as single arguments is common, so we
5312 had better support them. */
5317 int count = argc - recipients_arg;
5318 uschar **list = argv + recipients_arg;
5320 /* These options cannot be changed dynamically for non-SMTP messages */
5322 f.active_local_sender_retain = local_sender_retain;
5323 f.active_local_from_check = local_from_check;
5325 /* Save before any rewriting */
5327 raw_sender = string_copy(sender_address);
5329 /* Loop for each argument (supplied by user hence tainted) */
5331 for (int i = 0; i < count; i++)
5333 int start, end, domain;
5335 uschar * s = string_copy_taint(list[i], TRUE);
5337 /* Loop for each comma-separated address */
5341 BOOL finished = FALSE;
5343 uschar *ss = parse_find_address_end(s, FALSE);
5345 if (*ss == ',') *ss = 0; else finished = TRUE;
5347 /* Check max recipients - if -t was used, these aren't recipients */
5349 if (recipients_max > 0 && ++rcount > recipients_max &&
5350 !extract_recipients)
5351 if (error_handling == ERRORS_STDERR)
5353 fprintf(stderr, "exim: too many recipients\n");
5354 exim_exit(EXIT_FAILURE, US"main");
5358 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5359 errors_sender_rc : EXIT_FAILURE;
5363 BOOL b = allow_utf8_domains;
5364 allow_utf8_domains = TRUE;
5367 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5370 if (string_is_utf8(recipient))
5371 message_smtputf8 = TRUE;
5373 allow_utf8_domains = b;
5376 if (domain == 0 && !f.allow_unqualified_recipient)
5379 errmess = US"unqualified recipient address not allowed";
5382 if (recipient == NULL)
5384 if (error_handling == ERRORS_STDERR)
5386 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5387 string_printing(list[i]), errmess);
5388 exim_exit(EXIT_FAILURE, US"main");
5394 eblock.text1 = string_printing(list[i]);
5395 eblock.text2 = errmess;
5397 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5398 errors_sender_rc : EXIT_FAILURE;
5402 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5405 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5409 /* Show the recipients when debugging */
5413 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5414 if (recipients_list != NULL)
5416 debug_printf("Recipients:\n");
5417 for (int i = 0; i < recipients_count; i++)
5418 debug_printf(" %s\n", recipients_list[i].address);
5422 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5423 ignored; rejecting here would just add complication, and it can just as
5424 well be done later. Allow $recipients to be visible in the ACL. */
5426 if (acl_not_smtp_start)
5428 uschar *user_msg, *log_msg;
5429 f.enable_dollar_recipients = TRUE;
5430 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5431 &user_msg, &log_msg);
5432 f.enable_dollar_recipients = FALSE;
5435 /* Pause for a while waiting for input. If none received in that time,
5436 close the logfile, if we had one open; then if we wait for a long-running
5437 datasource (months, in one use-case) log rotation will not leave us holding
5440 if (!receive_timeout)
5442 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5445 FD_ZERO(&r); FD_SET(0, &r);
5446 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5449 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5450 will just read the headers for the message, and not write anything onto the
5453 message_ended = END_NOTENDED;
5454 more = receive_msg(extract_recipients);
5456 /* more is always FALSE here (not SMTP message) when reading a message
5457 for real; when reading the headers of a message for filter testing,
5458 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5460 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5461 } /* Non-SMTP message reception */
5463 /* If this is a filter testing run, there are headers in store, but
5464 no message on the spool. Run the filtering code in testing mode, setting
5465 the domain to the qualify domain and the local part to the current user,
5466 unless they have been set by options. The prefix and suffix are left unset
5467 unless specified. The the return path is set to to the sender unless it has
5468 already been set from a return-path header in the message. */
5470 if (filter_test != FTEST_NONE)
5472 deliver_domain = (ftest_domain != NULL)?
5473 ftest_domain : qualify_domain_recipient;
5474 deliver_domain_orig = deliver_domain;
5475 deliver_localpart = (ftest_localpart != NULL)?
5476 ftest_localpart : originator_login;
5477 deliver_localpart_orig = deliver_localpart;
5478 deliver_localpart_prefix = ftest_prefix;
5479 deliver_localpart_suffix = ftest_suffix;
5480 deliver_home = originator_home;
5482 if (return_path == NULL)
5484 printf("Return-path copied from sender\n");
5485 return_path = string_copy(sender_address);
5488 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5489 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5491 receive_add_recipient(
5492 string_sprintf("%s%s%s@%s",
5493 (ftest_prefix == NULL)? US"" : ftest_prefix,
5495 (ftest_suffix == NULL)? US"" : ftest_suffix,
5496 deliver_domain), -1);
5498 printf("Recipient = %s\n", recipients_list[0].address);
5499 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5500 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5502 if (chdir("/")) /* Get away from wherever the user is running this from */
5504 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5505 exim_exit(EXIT_FAILURE, US"main");
5508 /* Now we run either a system filter test, or a user filter test, or both.
5509 In the latter case, headers added by the system filter will persist and be
5510 available to the user filter. We need to copy the filter variables
5513 if ((filter_test & FTEST_SYSTEM) != 0)
5514 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5515 exim_exit(EXIT_FAILURE, US"main");
5517 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5519 if ((filter_test & FTEST_USER) != 0)
5520 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5521 exim_exit(EXIT_FAILURE, US"main");
5523 exim_exit(EXIT_SUCCESS, US"main");
5526 /* Else act on the result of message reception. We should not get here unless
5527 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5528 will be TRUE. If it is not, check on the number of messages received in this
5531 if (!session_local_queue_only &&
5532 smtp_accept_queue_per_connection > 0 &&
5533 receive_messagecount > smtp_accept_queue_per_connection)
5535 session_local_queue_only = TRUE;
5536 queue_only_reason = 2;
5539 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5540 and queue_only_load is set, check that the load average is below it. If it is
5541 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5542 default), we put the whole session into queue_only mode. It then remains this
5543 way for any subsequent messages on the same SMTP connection. This is a
5544 deliberate choice; even though the load average may fall, it doesn't seem
5545 right to deliver later messages on the same call when not delivering earlier
5546 ones. However, there are odd cases where this is not wanted, so this can be
5547 changed by setting queue_only_load_latch false. */
5549 local_queue_only = session_local_queue_only;
5550 if (!local_queue_only && queue_only_load >= 0)
5552 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5553 if (local_queue_only)
5555 queue_only_reason = 3;
5556 if (queue_only_load_latch) session_local_queue_only = TRUE;
5560 /* If running as an MUA wrapper, all queueing options and freezing options
5564 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5566 /* Log the queueing here, when it will get a message id attached, but
5567 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5570 if (local_queue_only)
5572 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5573 switch(queue_only_reason)
5576 log_write(L_delay_delivery,
5577 LOG_MAIN, "no immediate delivery: more than %d messages "
5578 "received in one connection", smtp_accept_queue_per_connection);
5582 log_write(L_delay_delivery,
5583 LOG_MAIN, "no immediate delivery: load average %.2f",
5584 (double)load_average/1000.0);
5589 else if (f.queue_only_policy || f.deliver_freeze)
5590 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5592 /* Else do the delivery unless the ACL or local_scan() called for queue only
5593 or froze the message. Always deliver in a separate process. A fork failure is
5594 not a disaster, as the delivery will eventually happen on a subsequent queue
5595 run. The search cache must be tidied before the fork, as the parent will
5596 do it before exiting. The child will trigger a lookup failure and
5597 thereby defer the delivery if it tries to use (for example) a cached ldap
5598 connection that the parent has called unbind on. */
5605 if ((pid = fork()) == 0)
5608 close_unwanted(); /* Close unwanted file descriptors and TLS */
5609 exim_nullstd(); /* Ensure std{in,out,err} exist */
5611 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5612 mode, deliver_drop_privilege is forced TRUE). */
5614 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5616 delivery_re_exec(CEE_EXEC_EXIT);
5617 /* Control does not return here. */
5620 /* No need to re-exec */
5622 rc = deliver_message(message_id, FALSE, FALSE);
5624 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5625 ? EXIT_SUCCESS : EXIT_FAILURE);
5630 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5631 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5632 "process: %s", strerror(errno));
5636 release_cutthrough_connection(US"msg passed for delivery");
5638 /* In the parent, wait if synchronous delivery is required. This will
5639 always be the case in MUA wrapper mode. */
5641 if (f.synchronous_delivery)
5644 while (wait(&status) != pid);
5645 if ((status & 0x00ff) != 0)
5646 log_write(0, LOG_MAIN|LOG_PANIC,
5647 "process %d crashed with signal %d while delivering %s",
5648 (int)pid, status & 0x00ff, message_id);
5649 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5654 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5655 automatically reaps children (see comments above the loop), clear away any
5656 finished subprocesses here, in case there are lots of messages coming in
5657 from the same source. */
5659 #ifndef SIG_IGN_WORKS
5660 while (waitpid(-1, NULL, WNOHANG) > 0);
5664 return_path = sender_address = NULL;
5665 authenticated_sender = NULL;
5666 deliver_localpart_orig = NULL;
5667 deliver_domain_orig = NULL;
5668 deliver_host = deliver_host_address = NULL;
5669 dnslist_domain = dnslist_matched = NULL;
5670 #ifdef WITH_CONTENT_SCAN
5671 malware_name = NULL;
5673 callout_address = NULL;
5674 sending_ip_address = NULL;
5676 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5678 store_reset(reset_point);
5681 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5682 return 0; /* To stop compiler warning */