1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
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 extern void init_lookup_list(void);
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Enums for cmdline interface *
57 *************************************************/
59 enum commandline_info { CMDINFO_NONE=0,
60 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
65 /*************************************************
66 * Compile regular expression and panic on fail *
67 *************************************************/
69 /* This function is called when failure to compile a regular expression leads
70 to a panic exit. In other cases, pcre_compile() is called directly. In many
71 cases where this function is used, the results of the compilation are to be
72 placed in long-lived store, so we temporarily reset the store management
73 functions that PCRE uses if the use_malloc flag is set.
76 pattern the pattern to compile
77 caseless TRUE if caseless matching is required
78 use_malloc TRUE if compile into malloc store
80 Returns: pointer to the compiled pattern
84 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
87 int options = PCRE_COPT;
92 pcre_malloc = function_store_malloc;
93 pcre_free = function_store_free;
95 if (caseless) options |= PCRE_CASELESS;
96 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
97 pcre_malloc = function_store_get;
98 pcre_free = function_dummy_free;
100 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
101 "%s at offset %d while compiling %s", error, offset, pattern);
108 /*************************************************
109 * Execute regular expression and set strings *
110 *************************************************/
112 /* This function runs a regular expression match, and sets up the pointers to
113 the matched substrings.
116 re the compiled expression
117 subject the subject string
118 options additional PCRE options
119 setup if < 0 do full setup
120 if >= 0 setup from setup+1 onwards,
121 excluding the full matched string
123 Returns: TRUE or FALSE
127 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
129 int ovector[3*(EXPAND_MAXN+1)];
130 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
131 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
133 if (n == 0) n = EXPAND_MAXN + 1;
137 expand_nmax = (setup < 0)? 0 : setup + 1;
138 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
140 expand_nstring[expand_nmax] = subject + ovector[nn];
141 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
151 /*************************************************
152 * Set up processing details *
153 *************************************************/
155 /* Save a text string for dumping when SIGUSR1 is received.
156 Do checks for overruns.
158 Arguments: format and arguments, as for printf()
163 set_process_info(const char *format, ...)
167 sprintf(CS process_info, "%5d ", (int)getpid());
168 len = Ustrlen(process_info);
169 va_start(ap, format);
170 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
171 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
172 len = Ustrlen(process_info);
173 process_info[len+0] = '\n';
174 process_info[len+1] = '\0';
175 process_info_len = len + 1;
176 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
183 /*************************************************
184 * Handler for SIGUSR1 *
185 *************************************************/
187 /* SIGUSR1 causes any exim process to write to the process log details of
188 what it is currently doing. It will only be used if the OS is capable of
189 setting up a handler that causes automatic restarting of any system call
190 that is in progress at the time.
192 This function takes care to be signal-safe.
194 Argument: the signal number (SIGUSR1)
199 usr1_handler(int sig)
203 os_restarting_signal(sig, usr1_handler);
205 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
208 /* If we are already running as the Exim user, try to create it in the
209 current process (assuming spool_directory exists). Otherwise, if we are
210 root, do the creation in an exim:exim subprocess. */
212 int euid = geteuid();
213 if (euid == exim_uid)
214 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
215 else if (euid == root_uid)
216 fd = log_create_as_exim(process_log_path);
219 /* If we are neither exim nor root, or if we failed to create the log file,
220 give up. There is not much useful we can do with errors, since we don't want
221 to disrupt whatever is going on outside the signal handler. */
225 {int dummy = write(fd, process_info, process_info_len); dummy = dummy; }
231 /*************************************************
233 *************************************************/
235 /* This handler is enabled most of the time that Exim is running. The handler
236 doesn't actually get used unless alarm() has been called to set a timer, to
237 place a time limit on a system call of some kind. When the handler is run, it
240 There are some other SIGALRM handlers that are used in special cases when more
241 than just a flag setting is required; for example, when reading a message's
242 input. These are normally set up in the code module that uses them, and the
243 SIGALRM handler is reset to this one afterwards.
245 Argument: the signal value (SIGALRM)
250 sigalrm_handler(int sig)
252 sig = sig; /* Keep picky compilers happy */
254 os_non_restarting_signal(SIGALRM, sigalrm_handler);
259 /*************************************************
260 * Sleep for a fractional time interval *
261 *************************************************/
263 /* This function is called by millisleep() and exim_wait_tick() to wait for a
264 period of time that may include a fraction of a second. The coding is somewhat
265 tedious. We do not expect setitimer() ever to fail, but if it does, the process
266 will wait for ever, so we panic in this instance. (There was a case of this
267 when a bug in a function that calls milliwait() caused it to pass invalid data.
268 That's when I added the check. :-)
270 We assume it to be not worth sleeping for under 100us; this value will
271 require revisiting as hardware advances. This avoids the issue of
272 a zero-valued timer setting meaning "never fire".
274 Argument: an itimerval structure containing the interval
279 milliwait(struct itimerval *itval)
282 sigset_t old_sigmask;
284 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
286 (void)sigemptyset(&sigmask); /* Empty mask */
287 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
288 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
289 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
290 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
291 "setitimer() failed: %s", strerror(errno));
292 (void)sigfillset(&sigmask); /* All signals */
293 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
294 (void)sigsuspend(&sigmask); /* Until SIGALRM */
295 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
301 /*************************************************
302 * Millisecond sleep function *
303 *************************************************/
305 /* The basic sleep() function has a granularity of 1 second, which is too rough
306 in some cases - for example, when using an increasing delay to slow down
309 Argument: number of millseconds
316 struct itimerval itval;
317 itval.it_interval.tv_sec = 0;
318 itval.it_interval.tv_usec = 0;
319 itval.it_value.tv_sec = msec/1000;
320 itval.it_value.tv_usec = (msec % 1000) * 1000;
326 /*************************************************
327 * Compare microsecond times *
328 *************************************************/
335 Returns: -1, 0, or +1
339 exim_tvcmp(struct timeval *t1, struct timeval *t2)
341 if (t1->tv_sec > t2->tv_sec) return +1;
342 if (t1->tv_sec < t2->tv_sec) return -1;
343 if (t1->tv_usec > t2->tv_usec) return +1;
344 if (t1->tv_usec < t2->tv_usec) return -1;
351 /*************************************************
352 * Clock tick wait function *
353 *************************************************/
355 /* Exim uses a time + a pid to generate a unique identifier in two places: its
356 message IDs, and in file names for maildir deliveries. Because some OS now
357 re-use pids within the same second, sub-second times are now being used.
358 However, for absolute certaintly, we must ensure the clock has ticked before
359 allowing the relevant process to complete. At the time of implementation of
360 this code (February 2003), the speed of processors is such that the clock will
361 invariably have ticked already by the time a process has done its job. This
362 function prepares for the time when things are faster - and it also copes with
363 clocks that go backwards.
366 then_tv A timeval which was used to create uniqueness; its usec field
367 has been rounded down to the value of the resolution.
368 We want to be sure the current time is greater than this.
369 resolution The resolution that was used to divide the microseconds
370 (1 for maildir, larger for message ids)
376 exim_wait_tick(struct timeval *then_tv, int resolution)
378 struct timeval now_tv;
379 long int now_true_usec;
381 (void)gettimeofday(&now_tv, NULL);
382 now_true_usec = now_tv.tv_usec;
383 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
385 if (exim_tvcmp(&now_tv, then_tv) <= 0)
387 struct itimerval itval;
388 itval.it_interval.tv_sec = 0;
389 itval.it_interval.tv_usec = 0;
390 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
391 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
393 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
394 negative value for the microseconds is possible only in the case when "now"
395 is more than a second less than "then". That means that itval.it_value.tv_sec
396 is greater than zero. The following correction is therefore safe. */
398 if (itval.it_value.tv_usec < 0)
400 itval.it_value.tv_usec += 1000000;
401 itval.it_value.tv_sec -= 1;
404 DEBUG(D_transport|D_receive)
406 if (!running_in_test_harness)
408 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
409 then_tv->tv_sec, (long) then_tv->tv_usec,
410 now_tv.tv_sec, (long) now_tv.tv_usec);
411 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
412 (long) itval.it_value.tv_usec);
423 /*************************************************
424 * Call fopen() with umask 777 and adjust mode *
425 *************************************************/
427 /* Exim runs with umask(0) so that files created with open() have the mode that
428 is specified in the open() call. However, there are some files, typically in
429 the spool directory, that are created with fopen(). They end up world-writeable
430 if no precautions are taken. Although the spool directory is not accessible to
431 the world, this is an untidiness. So this is a wrapper function for fopen()
432 that sorts out the mode of the created file.
435 filename the file name
436 options the fopen() options
437 mode the required mode
439 Returns: the fopened FILE or NULL
443 modefopen(const uschar *filename, const char *options, mode_t mode)
445 mode_t saved_umask = umask(0777);
446 FILE *f = Ufopen(filename, options);
447 (void)umask(saved_umask);
448 if (f != NULL) (void)fchmod(fileno(f), mode);
455 /*************************************************
456 * Ensure stdin, stdout, and stderr exist *
457 *************************************************/
459 /* Some operating systems grumble if an exec() happens without a standard
460 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
461 file will be opened and will use these fd values, and then some other bit of
462 code will assume, for example, that it can write error messages to stderr.
463 This function ensures that fds 0, 1, and 2 are open if they do not already
464 exist, by connecting them to /dev/null.
466 This function is also used to ensure that std{in,out,err} exist at all times,
467 so that if any library that Exim calls tries to use them, it doesn't crash.
479 for (i = 0; i <= 2; i++)
481 if (fstat(i, &statbuf) < 0 && errno == EBADF)
483 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
484 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
485 string_open_failed(errno, "/dev/null"));
486 if (devnull != i) (void)dup2(devnull, i);
489 if (devnull > 2) (void)close(devnull);
495 /*************************************************
496 * Close unwanted file descriptors for delivery *
497 *************************************************/
499 /* This function is called from a new process that has been forked to deliver
500 an incoming message, either directly, or using exec.
502 We want any smtp input streams to be closed in this new process. However, it
503 has been observed that using fclose() here causes trouble. When reading in -bS
504 input, duplicate copies of messages have been seen. The files will be sharing a
505 file pointer with the parent process, and it seems that fclose() (at least on
506 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
507 least sometimes. Hence we go for closing the underlying file descriptors.
509 If TLS is active, we want to shut down the TLS library, but without molesting
510 the parent's SSL connection.
512 For delivery of a non-SMTP message, we want to close stdin and stdout (and
513 stderr unless debugging) because the calling process might have set them up as
514 pipes and be waiting for them to close before it waits for the submission
515 process to terminate. If they aren't closed, they hold up the calling process
516 until the initial delivery process finishes, which is not what we want.
518 Exception: We do want it for synchronous delivery!
520 And notwithstanding all the above, if D_resolver is set, implying resolver
521 debugging, leave stdout open, because that's where the resolver writes its
524 When we close stderr (which implies we've also closed stdout), we also get rid
525 of any controlling terminal.
537 tls_close(TRUE, FALSE); /* Shut down the TLS library */
539 (void)close(fileno(smtp_in));
540 (void)close(fileno(smtp_out));
545 (void)close(0); /* stdin */
546 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
547 if (debug_selector == 0) /* stderr */
549 if (!synchronous_delivery)
562 /*************************************************
564 *************************************************/
566 /* This function sets a new uid and gid permanently, optionally calling
567 initgroups() to set auxiliary groups. There are some special cases when running
568 Exim in unprivileged modes. In these situations the effective uid will not be
569 root; if we already have the right effective uid/gid, and don't need to
570 initialize any groups, leave things as they are.
575 igflag TRUE if initgroups() wanted
576 msg text to use in debugging output and failure log
578 Returns: nothing; bombs out on failure
582 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
584 uid_t euid = geteuid();
585 gid_t egid = getegid();
587 if (euid == root_uid || euid != uid || egid != gid || igflag)
589 /* At least one OS returns +1 for initgroups failure, so just check for
594 struct passwd *pw = getpwuid(uid);
597 if (initgroups(pw->pw_name, gid) != 0)
598 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
599 (long int)uid, strerror(errno));
601 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
602 "no passwd entry for uid=%ld", (long int)uid);
605 if (setgid(gid) < 0 || setuid(uid) < 0)
607 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
608 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
612 /* Debugging output included uid/gid and all groups */
616 int group_count, save_errno;
617 gid_t group_list[NGROUPS_MAX];
618 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
619 (long int)geteuid(), (long int)getegid(), (long int)getpid());
620 group_count = getgroups(NGROUPS_MAX, group_list);
622 debug_printf(" auxiliary group list:");
626 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
628 else if (group_count < 0)
629 debug_printf(" <error: %s>", strerror(save_errno));
630 else debug_printf(" <none>");
638 /*************************************************
640 *************************************************/
642 /* Exim exits via this function so that it always clears up any open
648 Returns: does not return
656 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
657 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
664 /*************************************************
665 * Extract port from host address *
666 *************************************************/
668 /* Called to extract the port from the values given to -oMa and -oMi.
669 It also checks the syntax of the address, and terminates it before the
670 port data when a port is extracted.
673 address the address, with possible port on the end
675 Returns: the port, or zero if there isn't one
676 bombs out on a syntax error
680 check_port(uschar *address)
682 int port = host_address_extract_port(address);
683 if (string_is_ip_address(address, NULL) == 0)
685 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
693 /*************************************************
694 * Test/verify an address *
695 *************************************************/
697 /* This function is called by the -bv and -bt code. It extracts a working
698 address from a full RFC 822 address. This isn't really necessary per se, but it
699 has the effect of collapsing source routes.
703 flags flag bits for verify_address()
704 exit_value to be set for failures
710 test_address(uschar *s, int flags, int *exit_value)
712 int start, end, domain;
713 uschar *parse_error = NULL;
714 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
718 fprintf(stdout, "syntax error: %s\n", parse_error);
723 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
724 -1, -1, NULL, NULL, NULL);
725 if (rc == FAIL) *exit_value = 2;
726 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
732 /*************************************************
733 * Show supported features *
734 *************************************************/
736 /* This function is called for -bV/--version and for -d to output the optional
737 features of the current Exim binary.
739 Arguments: a FILE for printing
744 show_whats_supported(FILE *f)
748 #ifdef DB_VERSION_STRING
749 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
750 #elif defined(BTREEVERSION) && defined(HASHVERSION)
752 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
754 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
756 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
757 fprintf(f, "Probably ndbm\n");
758 #elif defined(USE_TDB)
759 fprintf(f, "Using tdb\n");
762 fprintf(f, "Probably GDBM (native mode)\n");
764 fprintf(f, "Probably GDBM (compatibility mode)\n");
768 fprintf(f, "Support for:");
769 #ifdef SUPPORT_CRYPTEQ
770 fprintf(f, " crypteq");
773 fprintf(f, " iconv()");
778 #ifdef HAVE_SETCLASSRESOURCES
779 fprintf(f, " use_setclassresources");
788 fprintf(f, " Expand_dlfunc");
790 #ifdef USE_TCP_WRAPPERS
791 fprintf(f, " TCPwrappers");
795 fprintf(f, " GnuTLS");
797 fprintf(f, " OpenSSL");
800 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
801 fprintf(f, " translate_ip_address");
803 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
804 fprintf(f, " move_frozen_messages");
806 #ifdef WITH_CONTENT_SCAN
807 fprintf(f, " Content_Scanning");
812 #ifdef WITH_OLD_DEMIME
813 fprintf(f, " Old_Demime");
821 #ifdef EXPERIMENTAL_SPF
822 fprintf(f, " Experimental_SPF");
824 #ifdef EXPERIMENTAL_SRS
825 fprintf(f, " Experimental_SRS");
827 #ifdef EXPERIMENTAL_BRIGHTMAIL
828 fprintf(f, " Experimental_Brightmail");
830 #ifdef EXPERIMENTAL_DANE
831 fprintf(f, " Experimental_DANE");
833 #ifdef EXPERIMENTAL_DCC
834 fprintf(f, " Experimental_DCC");
836 #ifdef EXPERIMENTAL_DMARC
837 fprintf(f, " Experimental_DMARC");
839 #ifdef EXPERIMENTAL_PROXY
840 fprintf(f, " Experimental_Proxy");
842 #ifdef EXPERIMENTAL_TPDA
843 fprintf(f, " Experimental_TPDA");
845 #ifdef EXPERIMENTAL_REDIS
846 fprintf(f, " Experimental_Redis");
848 #ifdef EXPERIMENTAL_CERTNAMES
849 fprintf(f, " Experimental_Certnames");
851 #ifdef EXPERIMENTAL_DSN
852 fprintf(f, " Experimental_DSN");
856 fprintf(f, "Lookups (built-in):");
857 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
858 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
860 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
863 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
864 fprintf(f, " dbm dbmjz dbmnz");
866 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
867 fprintf(f, " dnsdb");
869 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
870 fprintf(f, " dsearch");
872 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
873 fprintf(f, " ibase");
875 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
876 fprintf(f, " ldap ldapdn ldapm");
878 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
879 fprintf(f, " mysql");
881 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
882 fprintf(f, " nis nis0");
884 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
885 fprintf(f, " nisplus");
887 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
888 fprintf(f, " oracle");
890 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
891 fprintf(f, " passwd");
893 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
894 fprintf(f, " pgsql");
896 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
897 fprintf(f, " sqlite");
899 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
900 fprintf(f, " testdb");
902 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
903 fprintf(f, " whoson");
907 fprintf(f, "Authenticators:");
909 fprintf(f, " cram_md5");
911 #ifdef AUTH_CYRUS_SASL
912 fprintf(f, " cyrus_sasl");
915 fprintf(f, " dovecot");
918 fprintf(f, " gsasl");
920 #ifdef AUTH_HEIMDAL_GSSAPI
921 fprintf(f, " heimdal_gssapi");
923 #ifdef AUTH_PLAINTEXT
924 fprintf(f, " plaintext");
931 fprintf(f, "Routers:");
933 fprintf(f, " accept");
935 #ifdef ROUTER_DNSLOOKUP
936 fprintf(f, " dnslookup");
938 #ifdef ROUTER_IPLITERAL
939 fprintf(f, " ipliteral");
941 #ifdef ROUTER_IPLOOKUP
942 fprintf(f, " iplookup");
944 #ifdef ROUTER_MANUALROUTE
945 fprintf(f, " manualroute");
947 #ifdef ROUTER_QUERYPROGRAM
948 fprintf(f, " queryprogram");
950 #ifdef ROUTER_REDIRECT
951 fprintf(f, " redirect");
955 fprintf(f, "Transports:");
956 #ifdef TRANSPORT_APPENDFILE
957 fprintf(f, " appendfile");
958 #ifdef SUPPORT_MAILDIR
959 fprintf(f, "/maildir");
961 #ifdef SUPPORT_MAILSTORE
962 fprintf(f, "/mailstore");
968 #ifdef TRANSPORT_AUTOREPLY
969 fprintf(f, " autoreply");
971 #ifdef TRANSPORT_LMTP
974 #ifdef TRANSPORT_PIPE
977 #ifdef TRANSPORT_SMTP
982 if (fixed_never_users[0] > 0)
985 fprintf(f, "Fixed never_users: ");
986 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
987 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
988 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
991 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
993 /* Everything else is details which are only worth reporting when debugging.
994 Perhaps the tls_version_report should move into this too. */
999 /* clang defines __GNUC__ (at least, for me) so test for it first */
1000 #if defined(__clang__)
1001 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1002 #elif defined(__GNUC__)
1003 fprintf(f, "Compiler: GCC [%s]\n",
1007 "? unknown version ?"
1011 fprintf(f, "Compiler: <unknown>\n");
1015 tls_version_report(f);
1018 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1019 if (authi->version_report) {
1020 (*authi->version_report)(f);
1024 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1025 characters; unless it's an ancient version of PCRE in which case it
1027 #ifndef PCRE_PRERELEASE
1028 #define PCRE_PRERELEASE
1031 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1032 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1034 PCRE_MAJOR, PCRE_MINOR,
1035 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1038 #undef EXPAND_AND_QUOTE
1041 for (i = 0; i < lookup_list_count; i++)
1043 if (lookup_list[i]->version_report)
1044 lookup_list[i]->version_report(f);
1047 #ifdef WHITELIST_D_MACROS
1048 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1050 fprintf(f, "WHITELIST_D_MACROS unset\n");
1052 #ifdef TRUSTED_CONFIG_LIST
1053 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1055 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1062 /*************************************************
1063 * Show auxiliary information about Exim *
1064 *************************************************/
1067 show_exim_information(enum commandline_info request, FILE *stream)
1074 fprintf(stream, "Oops, something went wrong.\n");
1078 "The -bI: flag takes a string indicating which information to provide.\n"
1079 "If the string is not recognised, you'll get this help (on stderr).\n"
1081 " exim -bI:help this information\n"
1082 " exim -bI:dscp dscp value keywords known\n"
1083 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1087 for (pp = exim_sieve_extension_list; *pp; ++pp)
1088 fprintf(stream, "%s\n", *pp);
1091 dscp_list_to_stream(stream);
1097 /*************************************************
1098 * Quote a local part *
1099 *************************************************/
1101 /* This function is used when a sender address or a From: or Sender: header
1102 line is being created from the caller's login, or from an authenticated_id. It
1103 applies appropriate quoting rules for a local part.
1105 Argument: the local part
1106 Returns: the local part, quoted if necessary
1110 local_part_quote(uschar *lpart)
1112 BOOL needs_quote = FALSE;
1117 for (t = lpart; !needs_quote && *t != 0; t++)
1119 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1120 (*t != '.' || t == lpart || t[1] == 0);
1123 if (!needs_quote) return lpart;
1126 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1130 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1133 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1136 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1137 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1138 yield = string_cat(yield, &size, &ptr, nq, 1);
1142 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1150 /*************************************************
1151 * Load readline() functions *
1152 *************************************************/
1154 /* This function is called from testing executions that read data from stdin,
1155 but only when running as the calling user. Currently, only -be does this. The
1156 function loads the readline() function library and passes back the functions.
1157 On some systems, it needs the curses library, so load that too, but try without
1158 it if loading fails. All this functionality has to be requested at build time.
1161 fn_readline_ptr pointer to where to put the readline pointer
1162 fn_addhist_ptr pointer to where to put the addhistory function
1164 Returns: the dlopen handle or NULL on failure
1168 set_readline(char * (**fn_readline_ptr)(const char *),
1169 void (**fn_addhist_ptr)(const char *))
1172 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1174 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1175 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1177 if (dlhandle != NULL)
1179 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1180 * char * readline (const char *prompt);
1181 * void add_history (const char *string);
1183 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1184 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1188 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1197 /*************************************************
1198 * Get a line from stdin for testing things *
1199 *************************************************/
1201 /* This function is called when running tests that can take a number of lines
1202 of input (for example, -be and -bt). It handles continuations and trailing
1203 spaces. And prompting and a blank line output on eof. If readline() is in use,
1204 the arguments are non-NULL and provide the relevant functions.
1207 fn_readline readline function or NULL
1208 fn_addhist addhist function or NULL
1210 Returns: pointer to dynamic memory, or NULL at end of file
1214 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1219 uschar *yield = NULL;
1221 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1225 uschar buffer[1024];
1229 char *readline_line = NULL;
1230 if (fn_readline != NULL)
1232 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1233 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1234 p = US readline_line;
1239 /* readline() not in use */
1242 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1246 /* Handle the line */
1248 ss = p + (int)Ustrlen(p);
1249 while (ss > p && isspace(ss[-1])) ss--;
1253 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1256 yield = string_cat(yield, &size, &ptr, p, ss - p);
1259 if (fn_readline != NULL) free(readline_line);
1262 if (ss == p || yield[ptr-1] != '\\')
1270 if (yield == NULL) printf("\n");
1276 /*************************************************
1277 * Output usage information for the program *
1278 *************************************************/
1280 /* This function is called when there are no recipients
1281 or a specific --help argument was added.
1284 progname information on what name we were called by
1286 Returns: DOES NOT RETURN
1290 exim_usage(uschar *progname)
1293 /* Handle specific program invocation varients */
1294 if (Ustrcmp(progname, US"-mailq") == 0)
1297 "mailq - list the contents of the mail queue\n\n"
1298 "For a list of options, see the Exim documentation.\n");
1302 /* Generic usage - we output this whatever happens */
1304 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1305 "not directly from a shell command line. Options and/or arguments control\n"
1306 "what it does when called. For a list of options, see the Exim documentation.\n");
1313 /*************************************************
1314 * Validate that the macros given are okay *
1315 *************************************************/
1317 /* Typically, Exim will drop privileges if macros are supplied. In some
1318 cases, we want to not do so.
1320 Arguments: none (macros is a global)
1321 Returns: true if trusted, false otherwise
1325 macros_trusted(void)
1327 #ifdef WHITELIST_D_MACROS
1329 uschar *whitelisted, *end, *p, **whites, **w;
1330 int white_count, i, n;
1332 BOOL prev_char_item, found;
1337 #ifndef WHITELIST_D_MACROS
1341 /* We only trust -D overrides for some invoking users:
1342 root, the exim run-time user, the optional config owner user.
1343 I don't know why config-owner would be needed, but since they can own the
1344 config files anyway, there's no security risk to letting them override -D. */
1345 if ( ! ((real_uid == root_uid)
1346 || (real_uid == exim_uid)
1347 #ifdef CONFIGURE_OWNER
1348 || (real_uid == config_uid)
1352 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1356 /* Get a list of macros which are whitelisted */
1357 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1358 prev_char_item = FALSE;
1360 for (p = whitelisted; *p != '\0'; ++p)
1362 if (*p == ':' || isspace(*p))
1367 prev_char_item = FALSE;
1370 if (!prev_char_item)
1371 prev_char_item = TRUE;
1378 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1379 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1384 if (i == white_count)
1386 while (*p != '\0' && p < end)
1392 /* The list of macros should be very short. Accept the N*M complexity. */
1393 for (m = macros; m != NULL; m = m->next)
1396 for (w = whites; *w; ++w)
1397 if (Ustrcmp(*w, m->name) == 0)
1404 if (m->replacement == NULL)
1406 len = Ustrlen(m->replacement);
1409 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1410 0, PCRE_EOPT, NULL, 0);
1413 if (n != PCRE_ERROR_NOMATCH)
1414 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1418 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1424 /*************************************************
1425 * Entry point and high-level code *
1426 *************************************************/
1428 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1429 the appropriate action. All the necessary functions are present in the one
1430 binary. I originally thought one should split it up, but it turns out that so
1431 much of the apparatus is needed in each chunk that one might as well just have
1432 it all available all the time, which then makes the coding easier as well.
1435 argc count of entries in argv
1436 argv argument strings, with argv[0] being the program name
1438 Returns: EXIT_SUCCESS if terminated successfully
1439 EXIT_FAILURE otherwise, except when a message has been sent
1440 to the sender, and -oee was given
1444 main(int argc, char **cargv)
1446 uschar **argv = USS cargv;
1447 int arg_receive_timeout = -1;
1448 int arg_smtp_receive_timeout = -1;
1449 int arg_error_handling = error_handling;
1450 int filter_sfd = -1;
1451 int filter_ufd = -1;
1454 int list_queue_option = 0;
1456 int msg_action_arg = -1;
1457 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1458 int queue_only_reason = 0;
1460 int perl_start_option = 0;
1462 int recipients_arg = argc;
1463 int sender_address_domain = 0;
1464 int test_retry_arg = -1;
1465 int test_rewrite_arg = -1;
1466 BOOL arg_queue_only = FALSE;
1467 BOOL bi_option = FALSE;
1468 BOOL checking = FALSE;
1469 BOOL count_queue = FALSE;
1470 BOOL expansion_test = FALSE;
1471 BOOL extract_recipients = FALSE;
1472 BOOL flag_G = FALSE;
1473 BOOL flag_n = FALSE;
1474 BOOL forced_delivery = FALSE;
1475 BOOL f_end_dot = FALSE;
1476 BOOL deliver_give_up = FALSE;
1477 BOOL list_queue = FALSE;
1478 BOOL list_options = FALSE;
1479 BOOL local_queue_only;
1481 BOOL one_msg_action = FALSE;
1482 BOOL queue_only_set = FALSE;
1483 BOOL receiving_message = TRUE;
1484 BOOL sender_ident_set = FALSE;
1485 BOOL session_local_queue_only;
1487 BOOL removed_privilege = FALSE;
1488 BOOL usage_wanted = FALSE;
1489 BOOL verify_address_mode = FALSE;
1490 BOOL verify_as_sender = FALSE;
1491 BOOL version_printed = FALSE;
1492 uschar *alias_arg = NULL;
1493 uschar *called_as = US"";
1494 uschar *cmdline_syslog_name = NULL;
1495 uschar *start_queue_run_id = NULL;
1496 uschar *stop_queue_run_id = NULL;
1497 uschar *expansion_test_message = NULL;
1498 uschar *ftest_domain = NULL;
1499 uschar *ftest_localpart = NULL;
1500 uschar *ftest_prefix = NULL;
1501 uschar *ftest_suffix = NULL;
1502 uschar *malware_test_file = NULL;
1503 uschar *real_sender_address;
1504 uschar *originator_home = US"/";
1509 struct stat statbuf;
1510 pid_t passed_qr_pid = (pid_t)0;
1511 int passed_qr_pipe = -1;
1512 gid_t group_list[NGROUPS_MAX];
1514 /* For the -bI: flag */
1515 enum commandline_info info_flag = CMDINFO_NONE;
1516 BOOL info_stdout = FALSE;
1518 /* Possible options for -R and -S */
1520 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1522 /* Need to define this in case we need to change the environment in order
1523 to get rid of a bogus time zone. We have to make it char rather than uschar
1524 because some OS define it in /usr/include/unistd.h. */
1526 extern char **environ;
1528 /* If the Exim user and/or group and/or the configuration file owner/group were
1529 defined by ref:name at build time, we must now find the actual uid/gid values.
1530 This is a feature to make the lives of binary distributors easier. */
1532 #ifdef EXIM_USERNAME
1533 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1537 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1541 /* If ref:name uses a number as the name, route_finduser() returns
1542 TRUE with exim_uid set and pw coerced to NULL. */
1544 exim_gid = pw->pw_gid;
1545 #ifndef EXIM_GROUPNAME
1549 "exim: ref:name should specify a usercode, not a group.\n"
1550 "exim: can't let you get away with it unless you also specify a group.\n");
1557 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1563 #ifdef EXIM_GROUPNAME
1564 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1566 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1572 #ifdef CONFIGURE_OWNERNAME
1573 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1575 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1576 CONFIGURE_OWNERNAME);
1581 /* We default the system_filter_user to be the Exim run-time user, as a
1582 sane non-root value. */
1583 system_filter_uid = exim_uid;
1585 #ifdef CONFIGURE_GROUPNAME
1586 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1588 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1589 CONFIGURE_GROUPNAME);
1594 /* In the Cygwin environment, some initialization needs doing. It is fudged
1595 in by means of this macro. */
1601 /* Check a field which is patched when we are running Exim within its
1602 testing harness; do a fast initial check, and then the whole thing. */
1604 running_in_test_harness =
1605 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1607 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1608 at the start of a program; however, it seems that some environments do not
1609 follow this. A "strange" locale can affect the formatting of timestamps, so we
1612 setlocale(LC_ALL, "C");
1614 /* Set up the default handler for timing using alarm(). */
1616 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1618 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1619 because store_malloc writes a log entry on failure. */
1621 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1622 if (log_buffer == NULL)
1624 fprintf(stderr, "exim: failed to get store for log buffer\n");
1628 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1629 NULL when the daemon is run and the file is closed. We have to use this
1630 indirection, because some systems don't allow writing to the variable "stderr".
1633 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1635 /* Arrange for the PCRE regex library to use our store functions. Note that
1636 the normal calls are actually macros that add additional arguments for
1637 debugging purposes so we have to assign specially constructed functions here.
1638 The default is to use store in the stacking pool, but this is overridden in the
1639 regex_must_compile() function. */
1641 pcre_malloc = function_store_get;
1642 pcre_free = function_dummy_free;
1644 /* Ensure there is a big buffer for temporary use in several places. It is put
1645 in malloc store so that it can be freed for enlargement if necessary. */
1647 big_buffer = store_malloc(big_buffer_size);
1649 /* Set up the handler for the data request signal, and set the initial
1650 descriptive text. */
1652 set_process_info("initializing");
1653 os_restarting_signal(SIGUSR1, usr1_handler);
1655 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1656 in the daemon code. For the rest of Exim's uses, we ignore it. */
1658 signal(SIGHUP, SIG_IGN);
1660 /* We don't want to die on pipe errors as the code is written to handle
1661 the write error instead. */
1663 signal(SIGPIPE, SIG_IGN);
1665 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1666 set to SIG_IGN. This causes subprocesses that complete before the parent
1667 process waits for them not to hang around, so when Exim calls wait(), nothing
1668 is there. The wait() code has been made robust against this, but let's ensure
1669 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1670 ending status. We use sigaction rather than plain signal() on those OS where
1671 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1672 problem on AIX with this.) */
1676 struct sigaction act;
1677 act.sa_handler = SIG_DFL;
1678 sigemptyset(&(act.sa_mask));
1680 sigaction(SIGCHLD, &act, NULL);
1683 signal(SIGCHLD, SIG_DFL);
1686 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1691 /* Set up the version number. Set up the leading 'E' for the external form of
1692 message ids, set the pointer to the internal form, and initialize it to
1693 indicate no message being processed. */
1696 message_id_option[0] = '-';
1697 message_id_external = message_id_option + 1;
1698 message_id_external[0] = 'E';
1699 message_id = message_id_external + 1;
1702 /* Set the umask to zero so that any files Exim creates using open() are
1703 created with the modes that it specifies. NOTE: Files created with fopen() have
1704 a problem, which was not recognized till rather late (February 2006). With this
1705 umask, such files will be world writeable. (They are all content scanning files
1706 in the spool directory, which isn't world-accessible, so this is not a
1707 disaster, but it's untidy.) I don't want to change this overall setting,
1708 however, because it will interact badly with the open() calls. Instead, there's
1709 now a function called modefopen() that fiddles with the umask while calling
1714 /* Precompile the regular expression for matching a message id. Keep this in
1715 step with the code that generates ids in the accept.c module. We need to do
1716 this here, because the -M options check their arguments for syntactic validity
1717 using mac_ismsgid, which uses this. */
1720 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1722 /* Precompile the regular expression that is used for matching an SMTP error
1723 code, possibly extended, at the start of an error message. Note that the
1724 terminating whitespace character is included. */
1727 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1730 #ifdef WHITELIST_D_MACROS
1731 /* Precompile the regular expression used to filter the content of macros
1732 given to -D for permissibility. */
1734 regex_whitelisted_macro =
1735 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1739 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1740 this seems to be a generally accepted convention, since one finds symbolic
1741 links called "mailq" in standard OS configurations. */
1743 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1744 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1747 receiving_message = FALSE;
1748 called_as = US"-mailq";
1751 /* If the program is called as "rmail" treat it as equivalent to
1752 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1753 i.e. preventing a single dot on a line from terminating the message, and
1754 returning with zero return code, even in cases of error (provided an error
1755 message has been sent). */
1757 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1758 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1761 called_as = US"-rmail";
1762 errors_sender_rc = EXIT_SUCCESS;
1765 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1766 this is a smail convention. */
1768 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1769 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1771 smtp_input = smtp_batched_input = TRUE;
1772 called_as = US"-rsmtp";
1775 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1776 this is a smail convention. */
1778 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1779 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1782 receiving_message = FALSE;
1783 called_as = US"-runq";
1786 /* If the program is called as "newaliases" treat it as equivalent to
1787 "exim -bi"; this is a sendmail convention. */
1789 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1790 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1793 receiving_message = FALSE;
1794 called_as = US"-newaliases";
1797 /* Save the original effective uid for a couple of uses later. It should
1798 normally be root, but in some esoteric environments it may not be. */
1800 original_euid = geteuid();
1802 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1803 to be the same as the real ones. This makes a difference only if Exim is setuid
1804 (or setgid) to something other than root, which could be the case in some
1805 special configurations. */
1807 real_uid = getuid();
1808 real_gid = getgid();
1810 if (real_uid == root_uid)
1812 rv = setgid(real_gid);
1815 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1816 (long int)real_gid, strerror(errno));
1819 rv = setuid(real_uid);
1822 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1823 (long int)real_uid, strerror(errno));
1828 /* If neither the original real uid nor the original euid was root, Exim is
1829 running in an unprivileged state. */
1831 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1833 /* Scan the program's arguments. Some can be dealt with right away; others are
1834 simply recorded for checking and handling afterwards. Do a high-level switch
1835 on the second character (the one after '-'), to save some effort. */
1837 for (i = 1; i < argc; i++)
1839 BOOL badarg = FALSE;
1840 uschar *arg = argv[i];
1844 /* An argument not starting with '-' is the start of a recipients list;
1845 break out of the options-scanning loop. */
1853 /* An option consistion of -- terminates the options */
1855 if (Ustrcmp(arg, "--") == 0)
1857 recipients_arg = i + 1;
1861 /* Handle flagged options */
1863 switchchar = arg[1];
1866 /* Make all -ex options synonymous with -oex arguments, since that
1867 is assumed by various callers. Also make -qR options synonymous with -R
1868 options, as that seems to be required as well. Allow for -qqR too, and
1869 the same for -S options. */
1871 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1872 Ustrncmp(arg+1, "qR", 2) == 0 ||
1873 Ustrncmp(arg+1, "qS", 2) == 0)
1875 switchchar = arg[2];
1878 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1880 switchchar = arg[3];
1882 queue_2stage = TRUE;
1885 /* Make -r synonymous with -f, since it is a documented alias */
1887 else if (arg[1] == 'r') switchchar = 'f';
1889 /* Make -ov synonymous with -v */
1891 else if (Ustrcmp(arg, "-ov") == 0)
1897 /* deal with --option_aliases */
1898 else if (switchchar == '-')
1900 if (Ustrcmp(argrest, "help") == 0)
1902 usage_wanted = TRUE;
1905 else if (Ustrcmp(argrest, "version") == 0)
1912 /* High-level switch on active initial letter */
1917 /* sendmail uses -Ac and -Am to control which .cf file is used;
1920 if (*argrest == '\0') { badarg = TRUE; break; }
1923 BOOL ignore = FALSE;
1928 if (*(argrest + 1) == '\0')
1932 if (!ignore) { badarg = TRUE; break; }
1936 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1937 so has no need of it. */
1940 if (*argrest == 0) i++; /* Skip over the type */
1945 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1947 /* -bd: Run in daemon mode, awaiting SMTP connections.
1948 -bdf: Ditto, but in the foreground.
1951 if (*argrest == 'd')
1953 daemon_listen = TRUE;
1954 if (*(++argrest) == 'f') background_daemon = FALSE;
1955 else if (*argrest != 0) { badarg = TRUE; break; }
1958 /* -be: Run in expansion test mode
1959 -bem: Ditto, but read a message from a file first
1962 else if (*argrest == 'e')
1964 expansion_test = checking = TRUE;
1965 if (argrest[1] == 'm')
1967 if (++i >= argc) { badarg = TRUE; break; }
1968 expansion_test_message = argv[i];
1971 if (argrest[1] != 0) { badarg = TRUE; break; }
1974 /* -bF: Run system filter test */
1976 else if (*argrest == 'F')
1978 filter_test |= FTEST_SYSTEM;
1979 if (*(++argrest) != 0) { badarg = TRUE; break; }
1980 if (++i < argc) filter_test_sfile = argv[i]; else
1982 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1987 /* -bf: Run user filter test
1988 -bfd: Set domain for filter testing
1989 -bfl: Set local part for filter testing
1990 -bfp: Set prefix for filter testing
1991 -bfs: Set suffix for filter testing
1994 else if (*argrest == 'f')
1996 if (*(++argrest) == 0)
1998 filter_test |= FTEST_USER;
1999 if (++i < argc) filter_test_ufile = argv[i]; else
2001 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2009 fprintf(stderr, "exim: string expected after %s\n", arg);
2012 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2013 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2014 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2015 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2016 else { badarg = TRUE; break; }
2020 /* -bh: Host checking - an IP address must follow. */
2022 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2024 if (++i >= argc) { badarg = TRUE; break; }
2025 sender_host_address = argv[i];
2026 host_checking = checking = log_testing_mode = TRUE;
2027 host_checking_callout = argrest[1] == 'c';
2030 /* -bi: This option is used by sendmail to initialize *the* alias file,
2031 though it has the -oA option to specify a different file. Exim has no
2032 concept of *the* alias file, but since Sun's YP make script calls
2033 sendmail this way, some support must be provided. */
2035 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2037 /* -bI: provide information, of the type to follow after a colon.
2038 This is an Exim flag. */
2040 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2042 uschar *p = &argrest[2];
2043 info_flag = CMDINFO_HELP;
2046 if (strcmpic(p, CUS"sieve") == 0)
2048 info_flag = CMDINFO_SIEVE;
2051 else if (strcmpic(p, CUS"dscp") == 0)
2053 info_flag = CMDINFO_DSCP;
2056 else if (strcmpic(p, CUS"help") == 0)
2063 /* -bm: Accept and deliver message - the default option. Reinstate
2064 receiving_message, which got turned off for all -b options. */
2066 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2068 /* -bmalware: test the filename given for malware */
2070 else if (Ustrcmp(argrest, "malware") == 0)
2072 if (++i >= argc) { badarg = TRUE; break; }
2073 malware_test_file = argv[i];
2076 /* -bnq: For locally originating messages, do not qualify unqualified
2077 addresses. In the envelope, this causes errors; in header lines they
2080 else if (Ustrcmp(argrest, "nq") == 0)
2082 allow_unqualified_sender = FALSE;
2083 allow_unqualified_recipient = FALSE;
2086 /* -bpxx: List the contents of the mail queue, in various forms. If
2087 the option is -bpc, just a queue count is needed. Otherwise, if the
2088 first letter after p is r, then order is random. */
2090 else if (*argrest == 'p')
2092 if (*(++argrest) == 'c')
2095 if (*(++argrest) != 0) badarg = TRUE;
2099 if (*argrest == 'r')
2101 list_queue_option = 8;
2104 else list_queue_option = 0;
2108 /* -bp: List the contents of the mail queue, top-level only */
2110 if (*argrest == 0) {}
2112 /* -bpu: List the contents of the mail queue, top-level undelivered */
2114 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2116 /* -bpa: List the contents of the mail queue, including all delivered */
2118 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2120 /* Unknown after -bp[r] */
2130 /* -bP: List the configuration variables given as the address list.
2131 Force -v, so configuration errors get displayed. */
2133 else if (Ustrcmp(argrest, "P") == 0)
2135 list_options = TRUE;
2136 debug_selector |= D_v;
2137 debug_file = stderr;
2140 /* -brt: Test retry configuration lookup */
2142 else if (Ustrcmp(argrest, "rt") == 0)
2144 test_retry_arg = i + 1;
2148 /* -brw: Test rewrite configuration */
2150 else if (Ustrcmp(argrest, "rw") == 0)
2152 test_rewrite_arg = i + 1;
2156 /* -bS: Read SMTP commands on standard input, but produce no replies -
2157 all errors are reported by sending messages. */
2159 else if (Ustrcmp(argrest, "S") == 0)
2160 smtp_input = smtp_batched_input = receiving_message = TRUE;
2162 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2163 on standard output. */
2165 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2167 /* -bt: address testing mode */
2169 else if (Ustrcmp(argrest, "t") == 0)
2170 address_test_mode = checking = log_testing_mode = TRUE;
2172 /* -bv: verify addresses */
2174 else if (Ustrcmp(argrest, "v") == 0)
2175 verify_address_mode = checking = log_testing_mode = TRUE;
2177 /* -bvs: verify sender addresses */
2179 else if (Ustrcmp(argrest, "vs") == 0)
2181 verify_address_mode = checking = log_testing_mode = TRUE;
2182 verify_as_sender = TRUE;
2185 /* -bV: Print version string and support details */
2187 else if (Ustrcmp(argrest, "V") == 0)
2189 printf("Exim version %s #%s built %s\n", version_string,
2190 version_cnumber, version_date);
2191 printf("%s\n", CS version_copyright);
2192 version_printed = TRUE;
2193 show_whats_supported(stdout);
2196 /* -bw: inetd wait mode, accept a listening socket as stdin */
2198 else if (*argrest == 'w')
2200 inetd_wait_mode = TRUE;
2201 background_daemon = FALSE;
2202 daemon_listen = TRUE;
2203 if (*(++argrest) != '\0')
2205 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2206 if (inetd_wait_timeout <= 0)
2208 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2218 /* -C: change configuration file list; ignore if it isn't really
2219 a change! Enforce a prefix check if required. */
2224 if(++i < argc) argrest = argv[i]; else
2225 { badarg = TRUE; break; }
2227 if (Ustrcmp(config_main_filelist, argrest) != 0)
2229 #ifdef ALT_CONFIG_PREFIX
2231 int len = Ustrlen(ALT_CONFIG_PREFIX);
2232 uschar *list = argrest;
2234 while((filename = string_nextinlist(&list, &sep, big_buffer,
2235 big_buffer_size)) != NULL)
2237 if ((Ustrlen(filename) < len ||
2238 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2239 Ustrstr(filename, "/../") != NULL) &&
2240 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2242 fprintf(stderr, "-C Permission denied\n");
2247 if (real_uid != root_uid)
2249 #ifdef TRUSTED_CONFIG_LIST
2251 if (real_uid != exim_uid
2252 #ifdef CONFIGURE_OWNER
2253 && real_uid != config_uid
2256 trusted_config = FALSE;
2259 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2262 struct stat statbuf;
2264 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2265 (statbuf.st_uid != root_uid /* owner not root */
2266 #ifdef CONFIGURE_OWNER
2267 && statbuf.st_uid != config_uid /* owner not the special one */
2270 (statbuf.st_gid != root_gid /* group not root */
2271 #ifdef CONFIGURE_GROUP
2272 && statbuf.st_gid != config_gid /* group not the special one */
2274 && (statbuf.st_mode & 020) != 0 /* group writeable */
2276 (statbuf.st_mode & 2) != 0) /* world writeable */
2278 trusted_config = FALSE;
2283 /* Well, the trust list at least is up to scratch... */
2284 void *reset_point = store_get(0);
2285 uschar *trusted_configs[32];
2289 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2291 uschar *start = big_buffer, *nl;
2292 while (*start && isspace(*start))
2296 nl = Ustrchr(start, '\n');
2299 trusted_configs[nr_configs++] = string_copy(start);
2300 if (nr_configs == 32)
2308 uschar *list = argrest;
2310 while (trusted_config && (filename = string_nextinlist(&list,
2311 &sep, big_buffer, big_buffer_size)) != NULL)
2313 for (i=0; i < nr_configs; i++)
2315 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2318 if (i == nr_configs)
2320 trusted_config = FALSE;
2324 store_reset(reset_point);
2328 /* No valid prefixes found in trust_list file. */
2329 trusted_config = FALSE;
2335 /* Could not open trust_list file. */
2336 trusted_config = FALSE;
2340 /* Not root; don't trust config */
2341 trusted_config = FALSE;
2345 config_main_filelist = argrest;
2346 config_changed = TRUE;
2351 /* -D: set up a macro definition */
2354 #ifdef DISABLE_D_OPTION
2355 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2360 macro_item *mlast = NULL;
2363 uschar *s = argrest;
2365 while (isspace(*s)) s++;
2367 if (*s < 'A' || *s > 'Z')
2369 fprintf(stderr, "exim: macro name set by -D must start with "
2370 "an upper case letter\n");
2374 while (isalnum(*s) || *s == '_')
2376 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2380 if (ptr == 0) { badarg = TRUE; break; }
2381 while (isspace(*s)) s++;
2384 if (*s++ != '=') { badarg = TRUE; break; }
2385 while (isspace(*s)) s++;
2388 for (m = macros; m != NULL; m = m->next)
2390 if (Ustrcmp(m->name, name) == 0)
2392 fprintf(stderr, "exim: duplicated -D in command line\n");
2398 m = store_get(sizeof(macro_item) + Ustrlen(name));
2400 m->command_line = TRUE;
2401 if (mlast == NULL) macros = m; else mlast->next = m;
2402 Ustrcpy(m->name, name);
2403 m->replacement = string_copy(s);
2405 if (clmacro_count >= MAX_CLMACROS)
2407 fprintf(stderr, "exim: too many -D options on command line\n");
2410 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2416 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2417 The latter is now a no-op, retained for compatibility only. If -dd is used,
2418 debugging subprocesses of the daemon is disabled. */
2421 if (Ustrcmp(argrest, "ropcr") == 0)
2423 /* drop_cr = TRUE; */
2426 /* Use an intermediate variable so that we don't set debugging while
2427 decoding the debugging bits. */
2431 unsigned int selector = D_default;
2434 if (*argrest == 'd')
2436 debug_daemon = TRUE;
2440 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2441 debug_options_count, US"debug", 0);
2442 debug_selector = selector;
2447 /* -E: This is a local error message. This option is not intended for
2448 external use at all, but is not restricted to trusted callers because it
2449 does no harm (just suppresses certain error messages) and if Exim is run
2450 not setuid root it won't always be trusted when it generates error
2451 messages using this option. If there is a message id following -E, point
2452 message_reference at it, for logging. */
2455 local_error_message = TRUE;
2456 if (mac_ismsgid(argrest)) message_reference = argrest;
2460 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2461 option, so it looks as if historically the -oex options are also callable
2462 without the leading -o. So we have to accept them. Before the switch,
2463 anything starting -oe has been converted to -e. Exim does not support all
2464 of the sendmail error options. */
2467 if (Ustrcmp(argrest, "e") == 0)
2469 arg_error_handling = ERRORS_SENDER;
2470 errors_sender_rc = EXIT_SUCCESS;
2472 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2473 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2474 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2475 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2480 /* -F: Set sender's full name, used instead of the gecos entry from
2481 the password file. Since users can usually alter their gecos entries,
2482 there's no security involved in using this instead. The data can follow
2483 the -F or be in the next argument. */
2488 if(++i < argc) argrest = argv[i]; else
2489 { badarg = TRUE; break; }
2491 originator_name = argrest;
2492 sender_name_forced = TRUE;
2496 /* -f: Set sender's address - this value is only actually used if Exim is
2497 run by a trusted user, or if untrusted_set_sender is set and matches the
2498 address, except that the null address can always be set by any user. The
2499 test for this happens later, when the value given here is ignored when not
2500 permitted. For an untrusted user, the actual sender is still put in Sender:
2501 if it doesn't match the From: header (unless no_local_from_check is set).
2502 The data can follow the -f or be in the next argument. The -r switch is an
2503 obsolete form of -f but since there appear to be programs out there that
2504 use anything that sendmail has ever supported, better accept it - the
2505 synonymizing is done before the switch above.
2507 At this stage, we must allow domain literal addresses, because we don't
2508 know what the setting of allow_domain_literals is yet. Ditto for trailing
2509 dots and strip_trailing_dot. */
2517 if (i+1 < argc) argrest = argv[++i]; else
2518 { badarg = TRUE; break; }
2522 sender_address = string_sprintf(""); /* Ensure writeable memory */
2526 uschar *temp = argrest + Ustrlen(argrest) - 1;
2527 while (temp >= argrest && isspace(*temp)) temp--;
2528 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2529 allow_domain_literals = TRUE;
2530 strip_trailing_dot = TRUE;
2531 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2532 &sender_address_domain, TRUE);
2533 allow_domain_literals = FALSE;
2534 strip_trailing_dot = FALSE;
2535 if (sender_address == NULL)
2537 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2538 return EXIT_FAILURE;
2541 sender_address_forced = TRUE;
2545 /* -G: sendmail invocation to specify that it's a gateway submission and
2546 sendmail may complain about problems instead of fixing them.
2547 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2548 not at this time complain about problems. */
2554 /* -h: Set the hop count for an incoming message. Exim does not currently
2555 support this; it always computes it by counting the Received: headers.
2556 To put it in will require a change to the spool header file format. */
2561 if(++i < argc) argrest = argv[i]; else
2562 { badarg = TRUE; break; }
2564 if (!isdigit(*argrest)) badarg = TRUE;
2568 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2569 not to be documented for sendmail but mailx (at least) uses it) */
2572 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2576 /* -L: set the identifier used for syslog; equivalent to setting
2577 syslog_processname in the config file, but needs to be an admin option. */
2580 if (*argrest == '\0')
2582 if(++i < argc) argrest = argv[i]; else
2583 { badarg = TRUE; break; }
2585 sz = Ustrlen(argrest);
2588 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2589 return EXIT_FAILURE;
2593 fprintf(stderr, "exim: the -L syslog name is too short\n");
2594 return EXIT_FAILURE;
2596 cmdline_syslog_name = argrest;
2600 receiving_message = FALSE;
2602 /* -MC: continue delivery of another message via an existing open
2603 file descriptor. This option is used for an internal call by the
2604 smtp transport when there is a pending message waiting to go to an
2605 address to which it has got a connection. Five subsequent arguments are
2606 required: transport name, host name, IP address, sequence number, and
2607 message_id. Transports may decline to create new processes if the sequence
2608 number gets too big. The channel is stdin. This (-MC) must be the last
2609 argument. There's a subsequent check that the real-uid is privileged.
2611 If we are running in the test harness. delay for a bit, to let the process
2612 that set this one up complete. This makes for repeatability of the logging,
2615 if (Ustrcmp(argrest, "C") == 0)
2617 union sockaddr_46 interface_sock;
2618 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2622 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2623 return EXIT_FAILURE;
2626 if (msg_action_arg >= 0)
2628 fprintf(stderr, "exim: incompatible arguments\n");
2629 return EXIT_FAILURE;
2632 continue_transport = argv[++i];
2633 continue_hostname = argv[++i];
2634 continue_host_address = argv[++i];
2635 continue_sequence = Uatoi(argv[++i]);
2636 msg_action = MSG_DELIVER;
2637 msg_action_arg = ++i;
2638 forced_delivery = TRUE;
2639 queue_run_pid = passed_qr_pid;
2640 queue_run_pipe = passed_qr_pipe;
2642 if (!mac_ismsgid(argv[i]))
2644 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2646 return EXIT_FAILURE;
2649 /* Set up $sending_ip_address and $sending_port */
2651 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2653 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2657 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2659 return EXIT_FAILURE;
2662 if (running_in_test_harness) millisleep(500);
2666 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2667 precedes -MC (see above). The flag indicates that the host to which
2668 Exim is connected has accepted an AUTH sequence. */
2670 else if (Ustrcmp(argrest, "CA") == 0)
2672 smtp_authenticated = TRUE;
2676 #ifdef EXPERIMENTAL_DSN
2677 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2678 that exim is connected to supports the esmtp extension DSN */
2679 else if (strcmp(argrest, "CD") == 0)
2681 smtp_use_dsn = TRUE;
2686 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2687 it preceded -MC (see above) */
2689 else if (Ustrcmp(argrest, "CP") == 0)
2691 smtp_use_pipelining = TRUE;
2695 /* -MCQ: pass on the pid of the queue-running process that started
2696 this chain of deliveries and the fd of its synchronizing pipe; this
2697 is useful only when it precedes -MC (see above) */
2699 else if (Ustrcmp(argrest, "CQ") == 0)
2701 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2703 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2708 /* -MCS: set the smtp_use_size flag; this is useful only when it
2709 precedes -MC (see above) */
2711 else if (Ustrcmp(argrest, "CS") == 0)
2713 smtp_use_size = TRUE;
2717 /* -MCT: set the tls_offered flag; this is useful only when it
2718 precedes -MC (see above). The flag indicates that the host to which
2719 Exim is connected has offered TLS support. */
2722 else if (Ustrcmp(argrest, "CT") == 0)
2729 /* -M[x]: various operations on the following list of message ids:
2730 -M deliver the messages, ignoring next retry times and thawing
2731 -Mc deliver the messages, checking next retry times, no thawing
2732 -Mf freeze the messages
2733 -Mg give up on the messages
2734 -Mt thaw the messages
2735 -Mrm remove the messages
2736 In the above cases, this must be the last option. There are also the
2737 following options which are followed by a single message id, and which
2738 act on that message. Some of them use the "recipient" addresses as well.
2739 -Mar add recipient(s)
2740 -Mmad mark all recipients delivered
2741 -Mmd mark recipients(s) delivered
2743 -Mset load a message for use with -be
2745 -Mvc show copy (of whole message, in RFC 2822 format)
2750 else if (*argrest == 0)
2752 msg_action = MSG_DELIVER;
2753 forced_delivery = deliver_force_thaw = TRUE;
2755 else if (Ustrcmp(argrest, "ar") == 0)
2757 msg_action = MSG_ADD_RECIPIENT;
2758 one_msg_action = TRUE;
2760 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2761 else if (Ustrcmp(argrest, "es") == 0)
2763 msg_action = MSG_EDIT_SENDER;
2764 one_msg_action = TRUE;
2766 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2767 else if (Ustrcmp(argrest, "g") == 0)
2769 msg_action = MSG_DELIVER;
2770 deliver_give_up = TRUE;
2772 else if (Ustrcmp(argrest, "mad") == 0)
2774 msg_action = MSG_MARK_ALL_DELIVERED;
2776 else if (Ustrcmp(argrest, "md") == 0)
2778 msg_action = MSG_MARK_DELIVERED;
2779 one_msg_action = TRUE;
2781 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2782 else if (Ustrcmp(argrest, "set") == 0)
2784 msg_action = MSG_LOAD;
2785 one_msg_action = TRUE;
2787 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2788 else if (Ustrcmp(argrest, "vb") == 0)
2790 msg_action = MSG_SHOW_BODY;
2791 one_msg_action = TRUE;
2793 else if (Ustrcmp(argrest, "vc") == 0)
2795 msg_action = MSG_SHOW_COPY;
2796 one_msg_action = TRUE;
2798 else if (Ustrcmp(argrest, "vh") == 0)
2800 msg_action = MSG_SHOW_HEADER;
2801 one_msg_action = TRUE;
2803 else if (Ustrcmp(argrest, "vl") == 0)
2805 msg_action = MSG_SHOW_LOG;
2806 one_msg_action = TRUE;
2808 else { badarg = TRUE; break; }
2810 /* All the -Mxx options require at least one message id. */
2812 msg_action_arg = i + 1;
2813 if (msg_action_arg >= argc)
2815 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2816 return EXIT_FAILURE;
2819 /* Some require only message ids to follow */
2821 if (!one_msg_action)
2824 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2826 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2828 return EXIT_FAILURE;
2830 goto END_ARG; /* Remaining args are ids */
2833 /* Others require only one message id, possibly followed by addresses,
2834 which will be handled as normal arguments. */
2838 if (!mac_ismsgid(argv[msg_action_arg]))
2840 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2841 argv[msg_action_arg], arg);
2842 return EXIT_FAILURE;
2849 /* Some programs seem to call the -om option without the leading o;
2850 for sendmail it askes for "me too". Exim always does this. */
2853 if (*argrest != 0) badarg = TRUE;
2857 /* -N: don't do delivery - a debugging option that stops transports doing
2858 their thing. It implies debugging at the D_v level. */
2863 dont_deliver = TRUE;
2864 debug_selector |= D_v;
2865 debug_file = stderr;
2871 /* -n: This means "don't alias" in sendmail, apparently.
2872 For normal invocations, it has no effect.
2873 It may affect some other options. */
2879 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2880 option to the specified value. This form uses long names. We need to handle
2881 -O option=value and -Ooption=value. */
2888 fprintf(stderr, "exim: string expected after -O\n");
2896 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2899 if (*argrest == 'A')
2901 alias_arg = argrest + 1;
2902 if (alias_arg[0] == 0)
2904 if (i+1 < argc) alias_arg = argv[++i]; else
2906 fprintf(stderr, "exim: string expected after -oA\n");
2912 /* -oB: Set a connection message max value for remote deliveries */
2914 else if (*argrest == 'B')
2916 uschar *p = argrest + 1;
2919 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2921 connection_max_messages = 1;
2930 fprintf(stderr, "exim: number expected after -oB\n");
2933 connection_max_messages = Uatoi(p);
2937 /* -odb: background delivery */
2939 else if (Ustrcmp(argrest, "db") == 0)
2941 synchronous_delivery = FALSE;
2942 arg_queue_only = FALSE;
2943 queue_only_set = TRUE;
2946 /* -odf: foreground delivery (smail-compatible option); same effect as
2947 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2950 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2952 synchronous_delivery = TRUE;
2953 arg_queue_only = FALSE;
2954 queue_only_set = TRUE;
2957 /* -odq: queue only */
2959 else if (Ustrcmp(argrest, "dq") == 0)
2961 synchronous_delivery = FALSE;
2962 arg_queue_only = TRUE;
2963 queue_only_set = TRUE;
2966 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2967 but no remote delivery */
2969 else if (Ustrcmp(argrest, "dqs") == 0)
2972 arg_queue_only = FALSE;
2973 queue_only_set = TRUE;
2976 /* -oex: Sendmail error flags. As these are also accepted without the
2977 leading -o prefix, for compatibility with vacation and other callers,
2978 they are handled with -e above. */
2980 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2981 -oitrue: Another sendmail syntax for the same */
2983 else if (Ustrcmp(argrest, "i") == 0 ||
2984 Ustrcmp(argrest, "itrue") == 0)
2987 /* -oM*: Set various characteristics for an incoming message; actually
2988 acted on for trusted callers only. */
2990 else if (*argrest == 'M')
2994 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2998 /* -oMa: Set sender host address */
3000 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3002 /* -oMaa: Set authenticator name */
3004 else if (Ustrcmp(argrest, "Maa") == 0)
3005 sender_host_authenticated = argv[++i];
3007 /* -oMas: setting authenticated sender */
3009 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3011 /* -oMai: setting authenticated id */
3013 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3015 /* -oMi: Set incoming interface address */
3017 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3019 /* -oMm: Message reference */
3021 else if (Ustrcmp(argrest, "Mm") == 0)
3023 if (!mac_ismsgid(argv[i+1]))
3025 fprintf(stderr,"-oMm must be a valid message ID\n");
3028 if (!trusted_config)
3030 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3033 message_reference = argv[++i];
3036 /* -oMr: Received protocol */
3038 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3040 /* -oMs: Set sender host name */
3042 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3044 /* -oMt: Set sender ident */
3046 else if (Ustrcmp(argrest, "Mt") == 0)
3048 sender_ident_set = TRUE;
3049 sender_ident = argv[++i];
3052 /* Else a bad argument */
3061 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3062 seem to call this as -m (undocumented), so that is also accepted (see
3065 else if (Ustrcmp(argrest, "m") == 0) {}
3067 /* -oo: An ancient flag for old-style addresses which still seems to
3068 crop up in some calls (see in SCO). */
3070 else if (Ustrcmp(argrest, "o") == 0) {}
3072 /* -oP <name>: set pid file path for daemon */
3074 else if (Ustrcmp(argrest, "P") == 0)
3075 override_pid_file_path = argv[++i];
3077 /* -or <n>: set timeout for non-SMTP acceptance
3078 -os <n>: set timeout for SMTP acceptance */
3080 else if (*argrest == 'r' || *argrest == 's')
3082 int *tp = (*argrest == 'r')?
3083 &arg_receive_timeout : &arg_smtp_receive_timeout;
3084 if (argrest[1] == 0)
3086 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3088 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3091 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3096 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3098 else if (Ustrcmp(argrest, "X") == 0)
3099 override_local_interfaces = argv[++i];
3101 /* Unknown -o argument */
3107 /* -ps: force Perl startup; -pd force delayed Perl startup */
3111 if (*argrest == 's' && argrest[1] == 0)
3113 perl_start_option = 1;
3116 if (*argrest == 'd' && argrest[1] == 0)
3118 perl_start_option = -1;
3123 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3124 which sets the host protocol and host name */
3128 if (i+1 < argc) argrest = argv[++i]; else
3129 { badarg = TRUE; break; }
3134 uschar *hn = Ustrchr(argrest, ':');
3137 received_protocol = argrest;
3141 received_protocol = string_copyn(argrest, hn - argrest);
3142 sender_host_name = hn + 1;
3149 receiving_message = FALSE;
3150 if (queue_interval >= 0)
3152 fprintf(stderr, "exim: -q specified more than once\n");
3156 /* -qq...: Do queue runs in a 2-stage manner */
3158 if (*argrest == 'q')
3160 queue_2stage = TRUE;
3164 /* -qi...: Do only first (initial) deliveries */
3166 if (*argrest == 'i')
3168 queue_run_first_delivery = TRUE;
3172 /* -qf...: Run the queue, forcing deliveries
3173 -qff..: Ditto, forcing thawing as well */
3175 if (*argrest == 'f')
3177 queue_run_force = TRUE;
3178 if (*(++argrest) == 'f')
3180 deliver_force_thaw = TRUE;
3185 /* -q[f][f]l...: Run the queue only on local deliveries */
3187 if (*argrest == 'l')
3189 queue_run_local = TRUE;
3193 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3194 optionally starting from a given message id. */
3196 if (*argrest == 0 &&
3197 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3200 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3201 start_queue_run_id = argv[++i];
3202 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3203 stop_queue_run_id = argv[++i];
3206 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3207 optionally local only. */
3212 queue_interval = readconf_readtime(argrest, 0, FALSE);
3214 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3215 if (queue_interval <= 0)
3217 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3224 case 'R': /* Synonymous with -qR... */
3225 receiving_message = FALSE;
3227 /* -Rf: As -R (below) but force all deliveries,
3228 -Rff: Ditto, but also thaw all frozen messages,
3229 -Rr: String is regex
3230 -Rrf: Regex and force
3231 -Rrff: Regex and force and thaw
3233 in all cases provided there are no further characters in this
3239 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3241 if (Ustrcmp(argrest, rsopts[i]) == 0)
3243 if (i != 2) queue_run_force = TRUE;
3244 if (i >= 2) deliver_selectstring_regex = TRUE;
3245 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3246 argrest += Ustrlen(rsopts[i]);
3251 /* -R: Set string to match in addresses for forced queue run to
3252 pick out particular messages. */
3256 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3258 fprintf(stderr, "exim: string expected after -R\n");
3262 else deliver_selectstring = argrest;
3266 /* -r: an obsolete synonym for -f (see above) */
3269 /* -S: Like -R but works on sender. */
3271 case 'S': /* Synonymous with -qS... */
3272 receiving_message = FALSE;
3274 /* -Sf: As -S (below) but force all deliveries,
3275 -Sff: Ditto, but also thaw all frozen messages,
3276 -Sr: String is regex
3277 -Srf: Regex and force
3278 -Srff: Regex and force and thaw
3280 in all cases provided there are no further characters in this
3286 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3288 if (Ustrcmp(argrest, rsopts[i]) == 0)
3290 if (i != 2) queue_run_force = TRUE;
3291 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3292 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3293 argrest += Ustrlen(rsopts[i]);
3298 /* -S: Set string to match in addresses for forced queue run to
3299 pick out particular messages. */
3303 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3305 fprintf(stderr, "exim: string expected after -S\n");
3309 else deliver_selectstring_sender = argrest;
3312 /* -Tqt is an option that is exclusively for use by the testing suite.
3313 It is not recognized in other circumstances. It allows for the setting up
3314 of explicit "queue times" so that various warning/retry things can be
3315 tested. Otherwise variability of clock ticks etc. cause problems. */
3318 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3319 fudged_queue_times = argv[++i];
3324 /* -t: Set flag to extract recipients from body of message. */
3327 if (*argrest == 0) extract_recipients = TRUE;
3329 /* -ti: Set flag to extract recipients from body of message, and also
3330 specify that dot does not end the message. */
3332 else if (Ustrcmp(argrest, "i") == 0)
3334 extract_recipients = TRUE;
3338 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3341 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3348 /* -U: This means "initial user submission" in sendmail, apparently. The
3349 doc claims that in future sendmail may refuse syntactically invalid
3350 messages instead of fixing them. For the moment, we just ignore it. */
3356 /* -v: verify things - this is a very low-level debugging */
3361 debug_selector |= D_v;
3362 debug_file = stderr;
3368 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3370 The -x flag tells the sendmail command that mail from a local
3371 mail program has National Language Support (NLS) extended characters
3372 in the body of the mail item. The sendmail command can send mail with
3373 extended NLS characters across networks that normally corrupts these
3376 As Exim is 8-bit clean, it just ignores this flag. */
3379 if (*argrest != 0) badarg = TRUE;
3382 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3383 logs to that file. We swallow the parameter and otherwise ignore it. */
3386 if (*argrest == '\0')
3390 fprintf(stderr, "exim: string expected after -X\n");
3396 /* All other initial characters are errors */
3401 } /* End of high-level switch statement */
3403 /* Failed to recognize the option, or syntax error */
3407 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3408 "option %s\n", arg);
3414 /* If -R or -S have been specified without -q, assume a single queue run. */
3416 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3417 queue_interval < 0) queue_interval = 0;
3421 /* If usage_wanted is set we call the usage function - which never returns */
3422 if (usage_wanted) exim_usage(called_as);
3424 /* Arguments have been processed. Check for incompatibilities. */
3426 (smtp_input || extract_recipients || recipients_arg < argc) &&
3427 (daemon_listen || queue_interval >= 0 || bi_option ||
3428 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3429 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3432 msg_action_arg > 0 &&
3433 (daemon_listen || queue_interval >= 0 || list_options ||
3434 (checking && msg_action != MSG_LOAD) ||
3435 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3438 (daemon_listen || queue_interval >= 0) &&
3439 (sender_address != NULL || list_options || list_queue || checking ||
3443 daemon_listen && queue_interval == 0
3446 inetd_wait_mode && queue_interval >= 0
3450 (checking || smtp_input || extract_recipients ||
3451 filter_test != FTEST_NONE || bi_option)
3454 verify_address_mode &&
3455 (address_test_mode || smtp_input || extract_recipients ||
3456 filter_test != FTEST_NONE || bi_option)
3459 address_test_mode && (smtp_input || extract_recipients ||
3460 filter_test != FTEST_NONE || bi_option)
3463 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3467 deliver_selectstring != NULL && queue_interval < 0
3470 msg_action == MSG_LOAD &&
3471 (!expansion_test || expansion_test_message != NULL)
3475 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3479 /* If debugging is set up, set the file and the file descriptor to pass on to
3480 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3481 to run in the foreground. */
3483 if (debug_selector != 0)
3485 debug_file = stderr;
3486 debug_fd = fileno(debug_file);
3487 background_daemon = FALSE;
3488 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3489 if (debug_selector != D_v) /* -v only doesn't show this */
3491 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3492 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3494 if (!version_printed)
3495 show_whats_supported(stderr);
3499 /* When started with root privilege, ensure that the limits on the number of
3500 open files and the number of processes (where that is accessible) are
3501 sufficiently large, or are unset, in case Exim has been called from an
3502 environment where the limits are screwed down. Not all OS have the ability to
3503 change some of these limits. */
3507 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3513 #ifdef RLIMIT_NOFILE
3514 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3516 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3518 rlp.rlim_cur = rlp.rlim_max = 0;
3521 /* I originally chose 1000 as a nice big number that was unlikely to
3522 be exceeded. It turns out that some older OS have a fixed upper limit of
3525 if (rlp.rlim_cur < 1000)
3527 rlp.rlim_cur = rlp.rlim_max = 1000;
3528 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3530 rlp.rlim_cur = rlp.rlim_max = 256;
3531 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3532 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3539 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3541 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3543 rlp.rlim_cur = rlp.rlim_max = 0;
3546 #ifdef RLIM_INFINITY
3547 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3549 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3551 if (rlp.rlim_cur < 1000)
3553 rlp.rlim_cur = rlp.rlim_max = 1000;
3555 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3556 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3562 /* Exim is normally entered as root (but some special configurations are
3563 possible that don't do this). However, it always spins off sub-processes that
3564 set their uid and gid as required for local delivery. We don't want to pass on
3565 any extra groups that root may belong to, so we want to get rid of them all at
3568 We need to obey setgroups() at this stage, before possibly giving up root
3569 privilege for a changed configuration file, but later on we might need to
3570 check on the additional groups for the admin user privilege - can't do that
3571 till after reading the config, which might specify the exim gid. Therefore,
3572 save the group list here first. */
3574 group_count = getgroups(NGROUPS_MAX, group_list);
3575 if (group_count < 0)
3577 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3581 /* There is a fundamental difference in some BSD systems in the matter of
3582 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3583 known not to be different. On the "different" systems there is a single group
3584 list, and the first entry in it is the current group. On all other versions of
3585 Unix there is a supplementary group list, which is in *addition* to the current
3586 group. Consequently, to get rid of all extraneous groups on a "standard" system
3587 you pass over 0 groups to setgroups(), while on a "different" system you pass
3588 over a single group - the current group, which is always the first group in the
3589 list. Calling setgroups() with zero groups on a "different" system results in
3590 an error return. The following code should cope with both types of system.
3592 However, if this process isn't running as root, setgroups() can't be used
3593 since you have to be root to run it, even if throwing away groups. Not being
3594 root here happens only in some unusual configurations. We just ignore the
3597 if (setgroups(0, NULL) != 0)
3599 if (setgroups(1, group_list) != 0 && !unprivileged)
3601 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3606 /* If the configuration file name has been altered by an argument on the
3607 command line (either a new file name or a macro definition) and the caller is
3608 not root, or if this is a filter testing run, remove any setuid privilege the
3609 program has and run as the underlying user.
3611 The exim user is locked out of this, which severely restricts the use of -C
3614 Otherwise, set the real ids to the effective values (should be root unless run
3615 from inetd, which it can either be root or the exim uid, if one is configured).
3617 There is a private mechanism for bypassing some of this, in order to make it
3618 possible to test lots of configurations automatically, without having either to
3619 recompile each time, or to patch in an actual configuration file name and other
3620 values (such as the path name). If running in the test harness, pretend that
3621 configuration file changes and macro definitions haven't happened. */
3624 (!trusted_config || /* Config changed, or */
3625 !macros_trusted()) && /* impermissible macros and */
3626 real_uid != root_uid && /* Not root, and */
3627 !running_in_test_harness /* Not fudged */
3629 expansion_test /* expansion testing */
3631 filter_test != FTEST_NONE) /* Filter testing */
3633 setgroups(group_count, group_list);
3634 exim_setugid(real_uid, real_gid, FALSE,
3635 US"-C, -D, -be or -bf forces real uid");
3636 removed_privilege = TRUE;
3638 /* In the normal case when Exim is called like this, stderr is available
3639 and should be used for any logging information because attempts to write
3640 to the log will usually fail. To arrange this, we unset really_exim. However,
3641 if no stderr is available there is no point - we might as well have a go
3642 at the log (if it fails, syslog will be written).
3644 Note that if the invoker is Exim, the logs remain available. Messing with
3645 this causes unlogged successful deliveries. */
3647 if ((log_stderr != NULL) && (real_uid != exim_uid))
3648 really_exim = FALSE;
3651 /* Privilege is to be retained for the moment. It may be dropped later,
3652 depending on the job that this Exim process has been asked to do. For now, set
3653 the real uid to the effective so that subsequent re-execs of Exim are done by a
3656 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3658 /* If testing a filter, open the file(s) now, before wasting time doing other
3659 setups and reading the message. */
3661 if ((filter_test & FTEST_SYSTEM) != 0)
3663 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3666 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3668 return EXIT_FAILURE;
3672 if ((filter_test & FTEST_USER) != 0)
3674 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3677 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3679 return EXIT_FAILURE;
3683 /* Initialise lookup_list
3684 If debugging, already called above via version reporting.
3685 In either case, we initialise the list of available lookups while running
3686 as root. All dynamically modules are loaded from a directory which is
3687 hard-coded into the binary and is code which, if not a module, would be
3688 part of Exim already. Ability to modify the content of the directory
3689 is equivalent to the ability to modify a setuid binary!
3691 This needs to happen before we read the main configuration. */
3694 /* Read the main runtime configuration data; this gives up if there
3695 is a failure. It leaves the configuration file open so that the subsequent
3696 configuration data for delivery can be read if needed. */
3700 /* If an action on specific messages is requested, or if a daemon or queue
3701 runner is being started, we need to know if Exim was called by an admin user.
3702 This is the case if the real user is root or exim, or if the real group is
3703 exim, or if one of the supplementary groups is exim or a group listed in
3704 admin_groups. We don't fail all message actions immediately if not admin_user,
3705 since some actions can be performed by non-admin users. Instead, set admin_user
3706 for later interrogation. */
3708 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3713 for (i = 0; i < group_count; i++)
3715 if (group_list[i] == exim_gid) admin_user = TRUE;
3716 else if (admin_groups != NULL)
3718 for (j = 1; j <= (int)(admin_groups[0]); j++)
3719 if (admin_groups[j] == group_list[i])
3720 { admin_user = TRUE; break; }
3722 if (admin_user) break;
3726 /* Another group of privileged users are the trusted users. These are root,
3727 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3728 are permitted to specify sender_addresses with -f on the command line, and
3729 other message parameters as well. */
3731 if (real_uid == root_uid || real_uid == exim_uid)
3732 trusted_caller = TRUE;
3737 if (trusted_users != NULL)
3739 for (i = 1; i <= (int)(trusted_users[0]); i++)
3740 if (trusted_users[i] == real_uid)
3741 { trusted_caller = TRUE; break; }
3744 if (!trusted_caller && trusted_groups != NULL)
3746 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3748 if (trusted_groups[i] == real_gid)
3749 trusted_caller = TRUE;
3750 else for (j = 0; j < group_count; j++)
3752 if (trusted_groups[i] == group_list[j])
3753 { trusted_caller = TRUE; break; }
3755 if (trusted_caller) break;
3760 /* Handle the decoding of logging options. */
3762 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3763 log_selector_string, log_options, log_options_count, US"log", 0);
3767 debug_printf("configuration file is %s\n", config_main_filename);
3768 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3769 log_extra_selector);
3772 /* If domain literals are not allowed, check the sender address that was
3773 supplied with -f. Ditto for a stripped trailing dot. */
3775 if (sender_address != NULL)
3777 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3779 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3780 "allowed\n", sender_address);
3781 return EXIT_FAILURE;
3783 if (f_end_dot && !strip_trailing_dot)
3785 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3786 "(trailing dot not allowed)\n", sender_address);
3787 return EXIT_FAILURE;
3791 /* See if an admin user overrode our logging. */
3793 if (cmdline_syslog_name != NULL)
3797 syslog_processname = cmdline_syslog_name;
3798 log_file_path = string_copy(CUS"syslog");
3802 /* not a panic, non-privileged users should not be able to spam paniclog */
3804 "exim: you lack sufficient privilege to specify syslog process name\n");
3805 return EXIT_FAILURE;
3809 /* Paranoia check of maximum lengths of certain strings. There is a check
3810 on the length of the log file path in log.c, which will come into effect
3811 if there are any calls to write the log earlier than this. However, if we
3812 get this far but the string is very long, it is better to stop now than to
3813 carry on and (e.g.) receive a message and then have to collapse. The call to
3814 log_write() from here will cause the ultimate panic collapse if the complete
3815 file name exceeds the buffer length. */
3817 if (Ustrlen(log_file_path) > 200)
3818 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3819 "log_file_path is longer than 200 chars: aborting");
3821 if (Ustrlen(pid_file_path) > 200)
3822 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3823 "pid_file_path is longer than 200 chars: aborting");
3825 if (Ustrlen(spool_directory) > 200)
3826 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3827 "spool_directory is longer than 200 chars: aborting");
3829 /* Length check on the process name given to syslog for its TAG field,
3830 which is only permitted to be 32 characters or less. See RFC 3164. */
3832 if (Ustrlen(syslog_processname) > 32)
3833 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3834 "syslog_processname is longer than 32 chars: aborting");
3836 /* In some operating systems, the environment variable TMPDIR controls where
3837 temporary files are created; Exim doesn't use these (apart from when delivering
3838 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3839 If TMPDIR is found in the environment, reset it to the value defined in the
3840 TMPDIR macro, if this macro is defined. */
3845 for (p = USS environ; *p != NULL; p++)
3847 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3848 Ustrcmp(*p+7, TMPDIR) != 0)
3850 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3851 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3853 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3859 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3860 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3861 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3862 called by a user who has set the TZ variable. This then affects the timestamps
3863 in log files and in Received: headers, and any created Date: header lines. The
3864 required timezone is settable in the configuration file, so nothing can be done
3865 about this earlier - but hopefully nothing will normally be logged earlier than
3866 this. We have to make a new environment if TZ is wrong, but don't bother if
3867 timestamps_utc is set, because then all times are in UTC anyway. */
3869 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3871 timestamps_utc = TRUE;
3875 uschar *envtz = US getenv("TZ");
3876 if ((envtz == NULL && timezone_string != NULL) ||
3878 (timezone_string == NULL ||
3879 Ustrcmp(timezone_string, envtz) != 0)))
3881 uschar **p = USS environ;
3885 while (*p++ != NULL) count++;
3886 if (envtz == NULL) count++;
3887 newp = new = malloc(sizeof(uschar *) * (count + 1));
3888 for (p = USS environ; *p != NULL; p++)
3890 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3893 if (timezone_string != NULL)
3895 *newp = malloc(Ustrlen(timezone_string) + 4);
3896 sprintf(CS *newp++, "TZ=%s", timezone_string);
3901 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3902 tod_stamp(tod_log));
3906 /* Handle the case when we have removed the setuid privilege because of -C or
3907 -D. This means that the caller of Exim was not root.
3909 There is a problem if we were running as the Exim user. The sysadmin may
3910 expect this case to retain privilege because "the binary was called by the
3911 Exim user", but it hasn't, because either the -D option set macros, or the
3912 -C option set a non-trusted configuration file. There are two possibilities:
3914 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3915 to do message deliveries. Thus, the fact that it is running as a
3916 non-privileged user is plausible, and might be wanted in some special
3917 configurations. However, really_exim will have been set false when
3918 privilege was dropped, to stop Exim trying to write to its normal log
3919 files. Therefore, re-enable normal log processing, assuming the sysadmin
3920 has set up the log directory correctly.
3922 (2) If deliver_drop_privilege is not set, the configuration won't work as
3923 apparently intended, and so we log a panic message. In order to retain
3924 root for -C or -D, the caller must either be root or be invoking a
3925 trusted configuration file (when deliver_drop_privilege is false). */
3927 if (removed_privilege && (!trusted_config || macros != NULL) &&
3928 real_uid == exim_uid)
3930 if (deliver_drop_privilege)
3931 really_exim = TRUE; /* let logging work normally */
3933 log_write(0, LOG_MAIN|LOG_PANIC,
3934 "exim user lost privilege for using %s option",
3935 trusted_config? "-D" : "-C");
3938 /* Start up Perl interpreter if Perl support is configured and there is a
3939 perl_startup option, and the configuration or the command line specifies
3940 initializing starting. Note that the global variables are actually called
3941 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3944 if (perl_start_option != 0)
3945 opt_perl_at_start = (perl_start_option > 0);
3946 if (opt_perl_at_start && opt_perl_startup != NULL)
3949 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3950 errstr = init_perl(opt_perl_startup);
3953 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3954 return EXIT_FAILURE;
3956 opt_perl_started = TRUE;
3958 #endif /* EXIM_PERL */
3960 /* Log the arguments of the call if the configuration file said so. This is
3961 a debugging feature for finding out what arguments certain MUAs actually use.
3962 Don't attempt it if logging is disabled, or if listing variables or if
3963 verifying/testing addresses or expansions. */
3965 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3966 && really_exim && !list_options && !checking)
3969 uschar *p = big_buffer;
3971 Ustrcpy(p, "cwd= (failed)");
3972 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3974 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3976 for (i = 0; i < argc; i++)
3978 int len = Ustrlen(argv[i]);
3981 if (p + len + 8 >= big_buffer + big_buffer_size)
3984 log_write(0, LOG_MAIN, "%s", big_buffer);
3985 Ustrcpy(big_buffer, "...");
3988 printing = string_printing(argv[i]);
3989 if (printing[0] == 0) quote = US"\""; else
3991 uschar *pp = printing;
3993 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3995 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3996 (p - big_buffer) - 4), printing, quote);
4000 if ((log_extra_selector & LX_arguments) != 0)
4001 log_write(0, LOG_MAIN, "%s", big_buffer);
4003 debug_printf("%s\n", big_buffer);
4006 /* Set the working directory to be the top-level spool directory. We don't rely
4007 on this in the code, which always uses fully qualified names, but it's useful
4008 for core dumps etc. Don't complain if it fails - the spool directory might not
4009 be generally accessible and calls with the -C option (and others) have lost
4010 privilege by now. Before the chdir, we try to ensure that the directory exists.
4013 if (Uchdir(spool_directory) != 0)
4016 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4017 dummy = /* quieten compiler */ Uchdir(spool_directory);
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 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4049 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4054 /* We moved the admin/trusted check to be immediately after reading the
4055 configuration file. We leave these prints here to ensure that syslog setup,
4056 logfile setup, and so on has already happened. */
4058 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4059 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4061 /* Only an admin user may start the daemon or force a queue run in the default
4062 configuration, but the queue run restriction can be relaxed. Only an admin
4063 user may request that a message be returned to its sender forthwith. Only an
4064 admin user may specify a debug level greater than D_v (because it might show
4065 passwords, etc. in lookup queries). Only an admin user may request a queue
4066 count. Only an admin user can use the test interface to scan for email
4067 (because Exim will be in the spool dir and able to look at mails). */
4071 BOOL debugset = (debug_selector & ~D_v) != 0;
4072 if (deliver_give_up || daemon_listen || malware_test_file ||
4073 (count_queue && queue_list_requires_admin) ||
4074 (list_queue && queue_list_requires_admin) ||
4075 (queue_interval >= 0 && prod_requires_admin) ||
4076 (debugset && !running_in_test_harness))
4078 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4083 /* If the real user is not root or the exim uid, the argument for passing
4084 in an open TCP/IP connection for another message is not permitted, nor is
4085 running with the -N option for any delivery action, unless this call to exim is
4086 one that supplied an input message, or we are using a patched exim for
4087 regression testing. */
4089 if (real_uid != root_uid && real_uid != exim_uid &&
4090 (continue_hostname != NULL ||
4092 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4093 )) && !running_in_test_harness)
4095 fprintf(stderr, "exim: Permission denied\n");
4096 return EXIT_FAILURE;
4099 /* If the caller is not trusted, certain arguments are ignored when running for
4100 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4101 Note that authority for performing certain actions on messages is tested in the
4102 queue_action() function. */
4104 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4106 sender_host_name = sender_host_address = interface_address =
4107 sender_ident = received_protocol = NULL;
4108 sender_host_port = interface_port = 0;
4109 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4112 /* If a sender host address is set, extract the optional port number off the
4113 end of it and check its syntax. Do the same thing for the interface address.
4114 Exim exits if the syntax is bad. */
4118 if (sender_host_address != NULL)
4119 sender_host_port = check_port(sender_host_address);
4120 if (interface_address != NULL)
4121 interface_port = check_port(interface_address);
4124 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4129 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4130 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4134 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4135 return EXIT_FAILURE;
4139 /* If an SMTP message is being received check to see if the standard input is a
4140 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4141 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4146 union sockaddr_46 inetd_sock;
4147 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4148 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4150 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4151 if (family == AF_INET || family == AF_INET6)
4153 union sockaddr_46 interface_sock;
4154 size = sizeof(interface_sock);
4156 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4157 interface_address = host_ntoa(-1, &interface_sock, NULL,
4160 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4162 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4165 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4166 NULL, &sender_host_port);
4167 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4168 "inetd is not supported when mua_wrapper is set");
4173 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4174 return EXIT_FAILURE;
4180 /* If the load average is going to be needed while receiving a message, get it
4181 now for those OS that require the first call to os_getloadavg() to be done as
4182 root. There will be further calls later for each message received. */
4184 #ifdef LOAD_AVG_NEEDS_ROOT
4185 if (receiving_message &&
4186 (queue_only_load >= 0 ||
4187 (is_inetd && smtp_load_reserve >= 0)
4190 load_average = OS_GETLOADAVG();
4194 /* The queue_only configuration option can be overridden by -odx on the command
4195 line, except that if queue_only_override is false, queue_only cannot be unset
4196 from the command line. */
4198 if (queue_only_set && (queue_only_override || arg_queue_only))
4199 queue_only = arg_queue_only;
4201 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4204 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4205 if (arg_smtp_receive_timeout >= 0)
4206 smtp_receive_timeout = arg_smtp_receive_timeout;
4208 /* If Exim was started with root privilege, unless we have already removed the
4209 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4210 except when starting the daemon or doing some kind of delivery or address
4211 testing (-bt). These are the only cases when root need to be retained. We run
4212 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4213 retained only for starting the daemon. We always do the initgroups() in this
4214 situation (controlled by the TRUE below), in order to be as close as possible
4215 to the state Exim usually runs in. */
4217 if (!unprivileged && /* originally had root AND */
4218 !removed_privilege && /* still got root AND */
4219 !daemon_listen && /* not starting the daemon */
4220 queue_interval <= 0 && /* (either kind of daemon) */
4222 deliver_drop_privilege || /* requested unprivileged */
4224 queue_interval < 0 && /* not running the queue */
4225 (msg_action_arg < 0 || /* and */
4226 msg_action != MSG_DELIVER) && /* not delivering and */
4227 (!checking || !address_test_mode) /* not address checking */
4231 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4234 /* When we are retaining a privileged uid, we still change to the exim gid. */
4239 rv = setgid(exim_gid);
4240 /* Impact of failure is that some stuff might end up with an incorrect group.
4241 We track this for failures from root, since any attempt to change privilege
4242 by root should succeed and failures should be examined. For non-root,
4243 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4244 no need to complain then. */
4247 if (!(unprivileged || removed_privilege))
4250 "exim: changing group failed: %s\n", strerror(errno));
4254 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4255 (long int)exim_gid, strerror(errno));
4259 /* Handle a request to scan a file for malware */
4260 if (malware_test_file)
4262 #ifdef WITH_CONTENT_SCAN
4264 set_process_info("scanning file for malware");
4265 result = malware_in_file(malware_test_file);
4268 printf("No malware found.\n");
4273 printf("Malware lookup returned non-okay/fail: %d\n", result);
4277 printf("Malware found: %s\n", malware_name);
4279 printf("Malware scan detected malware of unknown name.\n");
4281 printf("Malware scanning not enabled at compile time.\n");
4286 /* Handle a request to list the delivery queue */
4290 set_process_info("listing the queue");
4291 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4295 /* Handle a request to count the delivery queue */
4299 set_process_info("counting the queue");
4304 /* Handle actions on specific messages, except for the force delivery and
4305 message load actions, which are done below. Some actions take a whole list of
4306 message ids, which are known to continue up to the end of the arguments. Others
4307 take a single message id and then operate on the recipients list. */
4309 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4311 int yield = EXIT_SUCCESS;
4312 set_process_info("acting on specified messages");
4314 if (!one_msg_action)
4316 for (i = msg_action_arg; i < argc; i++)
4317 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4318 yield = EXIT_FAILURE;
4321 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4322 recipients_arg)) yield = EXIT_FAILURE;
4326 /* We used to set up here to skip reading the ACL section, on
4327 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4328 Now, since the intro of the ${acl } expansion, ACL definitions may be
4329 needed in transports so we lost the optimisation. */
4333 /* The configuration data will have been read into POOL_PERM because we won't
4334 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4335 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4336 configuration were read into POOL_MAIN, because we don't do any resets till
4337 later on. However, it seems right, and it does ensure that both pools get used.
4340 store_pool = POOL_MAIN;
4342 /* Handle the -brt option. This is for checking out retry configurations.
4343 The next three arguments are a domain name or a complete address, and
4344 optionally two error numbers. All it does is to call the function that
4345 scans the retry configuration data. */
4347 if (test_retry_arg >= 0)
4349 retry_config *yield;
4350 int basic_errno = 0;
4354 if (test_retry_arg >= argc)
4356 printf("-brt needs a domain or address argument\n");
4357 exim_exit(EXIT_FAILURE);
4359 s1 = argv[test_retry_arg++];
4362 /* If the first argument contains no @ and no . it might be a local user
4363 or it might be a single-component name. Treat as a domain. */
4365 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4367 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4368 "being \ntreated as a one-component domain, not as a local part.\n\n",
4372 /* There may be an optional second domain arg. */
4374 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4375 s2 = argv[test_retry_arg++];
4377 /* The final arg is an error name */
4379 if (test_retry_arg < argc)
4381 uschar *ss = argv[test_retry_arg];
4383 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4386 printf("%s\n", CS error);
4387 return EXIT_FAILURE;
4390 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4391 code > 100 as an error is for matching codes to the decade. Turn them into
4392 a real error code, off the decade. */
4394 if (basic_errno == ERRNO_MAIL4XX ||
4395 basic_errno == ERRNO_RCPT4XX ||
4396 basic_errno == ERRNO_DATA4XX)
4398 int code = (more_errno >> 8) & 255;
4400 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4401 else if (code > 100)
4402 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4406 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4407 if (yield == NULL) printf("No retry information found\n"); else
4410 more_errno = yield->more_errno;
4411 printf("Retry rule: %s ", yield->pattern);
4413 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4415 printf("quota%s%s ",
4416 (more_errno > 0)? "_" : "",
4417 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4419 else if (yield->basic_errno == ECONNREFUSED)
4421 printf("refused%s%s ",
4422 (more_errno > 0)? "_" : "",
4423 (more_errno == 'M')? "MX" :
4424 (more_errno == 'A')? "A" : "");
4426 else if (yield->basic_errno == ETIMEDOUT)
4429 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4431 if (more_errno != 0) printf("_%s",
4432 (more_errno == 'M')? "MX" : "A");
4435 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4436 printf("auth_failed ");
4439 for (r = yield->rules; r != NULL; r = r->next)
4441 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4442 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4448 printf(",%d.", x/1000);
4462 exim_exit(EXIT_SUCCESS);
4465 /* Handle a request to list one or more configuration options */
4466 /* If -n was set, we suppress some information */
4470 set_process_info("listing variables");
4471 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4472 else for (i = recipients_arg; i < argc; i++)
4475 (Ustrcmp(argv[i], "router") == 0 ||
4476 Ustrcmp(argv[i], "transport") == 0 ||
4477 Ustrcmp(argv[i], "authenticator") == 0 ||
4478 Ustrcmp(argv[i], "macro") == 0))
4480 readconf_print(argv[i+1], argv[i], flag_n);
4483 else readconf_print(argv[i], NULL, flag_n);
4485 exim_exit(EXIT_SUCCESS);
4489 /* Handle a request to deliver one or more messages that are already on the
4490 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4491 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4493 Delivery of specific messages is typically used for a small number when
4494 prodding by hand (when the option forced_delivery will be set) or when
4495 re-execing to regain root privilege. Each message delivery must happen in a
4496 separate process, so we fork a process for each one, and run them sequentially
4497 so that debugging output doesn't get intertwined, and to avoid spawning too
4498 many processes if a long list is given. However, don't fork for the last one;
4499 this saves a process in the common case when Exim is called to deliver just one
4502 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4504 if (prod_requires_admin && !admin_user)
4506 fprintf(stderr, "exim: Permission denied\n");
4507 exim_exit(EXIT_FAILURE);
4509 set_process_info("delivering specified messages");
4510 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4511 for (i = msg_action_arg; i < argc; i++)
4516 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4517 else if ((pid = fork()) == 0)
4519 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4520 _exit(EXIT_SUCCESS);
4524 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4526 exim_exit(EXIT_FAILURE);
4530 exim_exit(EXIT_SUCCESS);
4534 /* If only a single queue run is requested, without SMTP listening, we can just
4535 turn into a queue runner, with an optional starting message id. */
4537 if (queue_interval == 0 && !daemon_listen)
4539 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4540 (start_queue_run_id == NULL)? US"" : US" starting at ",
4541 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4542 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4543 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4544 set_process_info("running the queue (single queue run)");
4545 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4546 exim_exit(EXIT_SUCCESS);
4550 /* Find the login name of the real user running this process. This is always
4551 needed when receiving a message, because it is written into the spool file. It
4552 may also be used to construct a from: or a sender: header, and in this case we
4553 need the user's full name as well, so save a copy of it, checked for RFC822
4554 syntax and munged if necessary, if it hasn't previously been set by the -F
4555 argument. We may try to get the passwd entry more than once, in case NIS or
4556 other delays are in evidence. Save the home directory for use in filter testing
4561 if ((pw = getpwuid(real_uid)) != NULL)
4563 originator_login = string_copy(US pw->pw_name);
4564 originator_home = string_copy(US pw->pw_dir);
4566 /* If user name has not been set by -F, set it from the passwd entry
4567 unless -f has been used to set the sender address by a trusted user. */
4569 if (originator_name == NULL)
4571 if (sender_address == NULL ||
4572 (!trusted_caller && filter_test == FTEST_NONE))
4574 uschar *name = US pw->pw_gecos;
4575 uschar *amp = Ustrchr(name, '&');
4578 /* Most Unix specify that a '&' character in the gecos field is
4579 replaced by a copy of the login name, and some even specify that
4580 the first character should be upper cased, so that's what we do. */
4585 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4586 amp - name, name, &loffset, originator_login, amp + 1);
4587 buffer[loffset] = toupper(buffer[loffset]);
4591 /* If a pattern for matching the gecos field was supplied, apply
4592 it and then expand the name string. */
4594 if (gecos_pattern != NULL && gecos_name != NULL)
4597 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4599 if (regex_match_and_setup(re, name, 0, -1))
4601 uschar *new_name = expand_string(gecos_name);
4603 if (new_name != NULL)
4605 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4606 "gecos field \"%s\"\n", new_name, name);
4609 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4610 "\"%s\": %s\n", gecos_name, expand_string_message);
4612 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4613 "gecos field \"%s\"\n", gecos_pattern, name);
4614 store_free((void *)re);
4616 originator_name = string_copy(name);
4619 /* A trusted caller has used -f but not -F */
4621 else originator_name = US"";
4624 /* Break the retry loop */
4629 if (++i > finduser_retries) break;
4633 /* If we cannot get a user login, log the incident and give up, unless the
4634 configuration specifies something to use. When running in the test harness,
4635 any setting of unknown_login overrides the actual name. */
4637 if (originator_login == NULL || running_in_test_harness)
4639 if (unknown_login != NULL)
4641 originator_login = expand_string(unknown_login);
4642 if (originator_name == NULL && unknown_username != NULL)
4643 originator_name = expand_string(unknown_username);
4644 if (originator_name == NULL) originator_name = US"";
4646 if (originator_login == NULL)
4647 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4651 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4654 originator_name = string_copy(parse_fix_phrase(originator_name,
4655 Ustrlen(originator_name), big_buffer, big_buffer_size));
4657 /* If a message is created by this call of Exim, the uid/gid of its originator
4658 are those of the caller. These values are overridden if an existing message is
4659 read in from the spool. */
4661 originator_uid = real_uid;
4662 originator_gid = real_gid;
4664 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4665 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4667 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4668 returns. We leave this till here so that the originator_ fields are available
4669 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4672 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4676 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4677 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4678 "mua_wrapper is set");
4683 /* If the sender ident has not been set (by a trusted caller) set it to
4684 the caller. This will get overwritten below for an inetd call. If a trusted
4685 caller has set it empty, unset it. */
4687 if (sender_ident == NULL) sender_ident = originator_login;
4688 else if (sender_ident[0] == 0) sender_ident = NULL;
4690 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4691 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4692 originator_* variables set. */
4694 if (test_rewrite_arg >= 0)
4696 really_exim = FALSE;
4697 if (test_rewrite_arg >= argc)
4699 printf("-brw needs an address argument\n");
4700 exim_exit(EXIT_FAILURE);
4702 rewrite_test(argv[test_rewrite_arg]);
4703 exim_exit(EXIT_SUCCESS);
4706 /* A locally-supplied message is considered to be coming from a local user
4707 unless a trusted caller supplies a sender address with -f, or is passing in the
4708 message via SMTP (inetd invocation or otherwise). */
4710 if ((sender_address == NULL && !smtp_input) ||
4711 (!trusted_caller && filter_test == FTEST_NONE))
4713 sender_local = TRUE;
4715 /* A trusted caller can supply authenticated_sender and authenticated_id
4716 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4717 defaults except when host checking. */
4719 if (authenticated_sender == NULL && !host_checking)
4720 authenticated_sender = string_sprintf("%s@%s", originator_login,
4721 qualify_domain_sender);
4722 if (authenticated_id == NULL && !host_checking)
4723 authenticated_id = originator_login;
4726 /* Trusted callers are always permitted to specify the sender address.
4727 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4728 is specified is the empty address. However, if a trusted caller does not
4729 specify a sender address for SMTP input, we leave sender_address unset. This
4730 causes the MAIL commands to be honoured. */
4732 if ((!smtp_input && sender_address == NULL) ||
4733 !receive_check_set_sender(sender_address))
4735 /* Either the caller is not permitted to set a general sender, or this is
4736 non-SMTP input and the trusted caller has not set a sender. If there is no
4737 sender, or if a sender other than <> is set, override with the originator's
4738 login (which will get qualified below), except when checking things. */
4740 if (sender_address == NULL /* No sender_address set */
4742 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4743 !checking && /* Not running tests, AND */
4744 filter_test == FTEST_NONE)) /* Not testing a filter */
4746 sender_address = originator_login;
4747 sender_address_forced = FALSE;
4748 sender_address_domain = 0;
4752 /* Remember whether an untrusted caller set the sender address */
4754 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4756 /* Ensure that the sender address is fully qualified unless it is the empty
4757 address, which indicates an error message, or doesn't exist (root caller, smtp
4758 interface, no -f argument). */
4760 if (sender_address != NULL && sender_address[0] != 0 &&
4761 sender_address_domain == 0)
4762 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4763 qualify_domain_sender);
4765 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4767 /* Handle a request to verify a list of addresses, or test them for delivery.
4768 This must follow the setting of the sender address, since routers can be
4769 predicated upon the sender. If no arguments are given, read addresses from
4770 stdin. Set debug_level to at least D_v to get full output for address testing.
4773 if (verify_address_mode || address_test_mode)
4776 int flags = vopt_qualify;
4778 if (verify_address_mode)
4780 if (!verify_as_sender) flags |= vopt_is_recipient;
4781 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4786 flags |= vopt_is_recipient;
4787 debug_selector |= D_v;
4788 debug_file = stderr;
4789 debug_fd = fileno(debug_file);
4790 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4793 if (recipients_arg < argc)
4795 while (recipients_arg < argc)
4797 uschar *s = argv[recipients_arg++];
4800 BOOL finished = FALSE;
4801 uschar *ss = parse_find_address_end(s, FALSE);
4802 if (*ss == ',') *ss = 0; else finished = TRUE;
4803 test_address(s, flags, &exit_value);
4806 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4813 uschar *s = get_stdinput(NULL, NULL);
4814 if (s == NULL) break;
4815 test_address(s, flags, &exit_value);
4819 exim_exit(exit_value);
4822 /* Handle expansion checking. Either expand items on the command line, or read
4823 from stdin if there aren't any. If -Mset was specified, load the message so
4824 that its variables can be used, but restrict this facility to admin users.
4825 Otherwise, if -bem was used, read a message from stdin. */
4829 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4831 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4834 fprintf(stderr, "exim: permission denied\n");
4837 message_id = argv[msg_action_arg];
4838 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4839 if (!spool_open_datafile(message_id))
4840 printf ("Failed to load message datafile %s\n", message_id);
4841 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4842 printf ("Failed to load message %s\n", message_id);
4845 /* Read a test message from a file. We fudge it up to be on stdin, saving
4846 stdin itself for later reading of expansion strings. */
4848 else if (expansion_test_message != NULL)
4850 int save_stdin = dup(0);
4851 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4854 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4856 return EXIT_FAILURE;
4859 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4860 message_ended = END_NOTENDED;
4861 read_message_body(receive_msg(extract_recipients));
4862 message_linecount += body_linecount;
4863 (void)dup2(save_stdin, 0);
4864 (void)close(save_stdin);
4865 clearerr(stdin); /* Required by Darwin */
4868 /* Allow $recipients for this testing */
4870 enable_dollar_recipients = TRUE;
4872 /* Expand command line items */
4874 if (recipients_arg < argc)
4876 while (recipients_arg < argc)
4878 uschar *s = argv[recipients_arg++];
4879 uschar *ss = expand_string(s);
4880 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4881 else printf("%s\n", CS ss);
4889 char *(*fn_readline)(const char *) = NULL;
4890 void (*fn_addhist)(const char *) = NULL;
4893 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4899 uschar *source = get_stdinput(fn_readline, fn_addhist);
4900 if (source == NULL) break;
4901 ss = expand_string(source);
4903 printf ("Failed: %s\n", expand_string_message);
4904 else printf("%s\n", CS ss);
4908 if (dlhandle != NULL) dlclose(dlhandle);
4912 /* The data file will be open after -Mset */
4914 if (deliver_datafile >= 0)
4916 (void)close(deliver_datafile);
4917 deliver_datafile = -1;
4920 exim_exit(EXIT_SUCCESS);
4924 /* The active host name is normally the primary host name, but it can be varied
4925 for hosts that want to play several parts at once. We need to ensure that it is
4926 set for host checking, and for receiving messages. */
4928 smtp_active_hostname = primary_hostname;
4929 if (raw_active_hostname != NULL)
4931 uschar *nah = expand_string(raw_active_hostname);
4934 if (!expand_string_forcedfail)
4935 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4936 "(smtp_active_hostname): %s", raw_active_hostname,
4937 expand_string_message);
4939 else if (nah[0] != 0) smtp_active_hostname = nah;
4942 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4943 given IP address so that the blocking and relay configuration can be tested.
4944 Unless a sender_ident was set by -oMt, we discard it (the default is the
4945 caller's login name). An RFC 1413 call is made only if we are running in the
4946 test harness and an incoming interface and both ports are specified, because
4947 there is no TCP/IP call to find the ident for. */
4954 if (!sender_ident_set)
4956 sender_ident = NULL;
4957 if (running_in_test_harness && sender_host_port != 0 &&
4958 interface_address != NULL && interface_port != 0)
4959 verify_get_ident(1413);
4962 /* In case the given address is a non-canonical IPv6 address, canonicize
4963 it. The code works for both IPv4 and IPv6, as it happens. */
4965 size = host_aton(sender_host_address, x);
4966 sender_host_address = store_get(48); /* large enough for full IPv6 */
4967 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4969 /* Now set up for testing */
4971 host_build_sender_fullhost();
4975 sender_local = FALSE;
4976 sender_host_notsocket = TRUE;
4977 debug_file = stderr;
4978 debug_fd = fileno(debug_file);
4979 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4980 "**** but without any ident (RFC 1413) callback.\n"
4981 "**** This is not for real!\n\n",
4982 sender_host_address);
4984 if (verify_check_host(&hosts_connection_nolog) == OK)
4985 log_write_selector &= ~L_smtp_connection;
4986 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4988 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4989 because a log line has already been written for all its failure exists
4990 (usually "connection refused: <reason>") and writing another one is
4991 unnecessary clutter. */
4993 if (smtp_start_session())
4995 reset_point = store_get(0);
4998 store_reset(reset_point);
4999 if (smtp_setup_msg() <= 0) break;
5000 if (!receive_msg(FALSE)) break;
5004 exim_exit(EXIT_SUCCESS);
5008 /* Arrange for message reception if recipients or SMTP were specified;
5009 otherwise complain unless a version print (-bV) happened or this is a filter
5010 verification test or info dump.
5011 In the former case, show the configuration file name. */
5013 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5015 if (version_printed)
5017 printf("Configuration file is %s\n", config_main_filename);
5018 return EXIT_SUCCESS;
5021 if (info_flag != CMDINFO_NONE)
5023 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5024 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5027 if (filter_test == FTEST_NONE)
5028 exim_usage(called_as);
5032 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5033 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5034 that we are not called from inetd, because that is rejected above. The
5035 following configuration settings are forced here:
5037 (1) Synchronous delivery (-odi)
5038 (2) Errors to stderr (-oep == -oeq)
5039 (3) No parallel remote delivery
5040 (4) Unprivileged delivery
5042 We don't force overall queueing options because there are several of them;
5043 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5044 to override any SMTP queueing. */
5048 synchronous_delivery = TRUE;
5049 arg_error_handling = ERRORS_STDERR;
5050 remote_max_parallel = 1;
5051 deliver_drop_privilege = TRUE;
5053 queue_smtp_domains = NULL;
5057 /* Prepare to accept one or more new messages on the standard input. When a
5058 message has been read, its id is returned in message_id[]. If doing immediate
5059 delivery, we fork a delivery process for each received message, except for the
5060 last one, where we can save a process switch.
5062 It is only in non-smtp mode that error_handling is allowed to be changed from
5063 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5064 sendmail error modes other than -oem ever actually used? Later: yes.) */
5066 if (!smtp_input) error_handling = arg_error_handling;
5068 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5069 logging being sent down the socket and make an identd call to get the
5074 (void)fclose(stderr);
5075 exim_nullstd(); /* Re-open to /dev/null */
5076 verify_get_ident(IDENT_PORT);
5077 host_build_sender_fullhost();
5078 set_process_info("handling incoming connection from %s via inetd",
5082 /* If the sender host address has been set, build sender_fullhost if it hasn't
5083 already been done (which it will have been for inetd). This caters for the
5084 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5085 so that the test for IP options is skipped for -bs input. */
5087 if (sender_host_address != NULL && sender_fullhost == NULL)
5089 host_build_sender_fullhost();
5090 set_process_info("handling incoming connection from %s via -oMa",
5092 sender_host_notsocket = TRUE;
5095 /* Otherwise, set the sender host as unknown except for inetd calls. This
5096 prevents host checking in the case of -bs not from inetd and also for -bS. */
5098 else if (!is_inetd) sender_host_unknown = TRUE;
5100 /* If stdout does not exist, then dup stdin to stdout. This can happen
5101 if exim is started from inetd. In this case fd 0 will be set to the socket,
5102 but fd 1 will not be set. This also happens for passed SMTP channels. */
5104 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5106 /* Set up the incoming protocol name and the state of the program. Root is
5107 allowed to force received protocol via the -oMr option above. If we have come
5108 via inetd, the process info has already been set up. We don't set
5109 received_protocol here for smtp input, as it varies according to
5110 batch/HELO/EHLO/AUTH/TLS. */
5114 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5115 smtp_batched_input? "batched " : "",
5116 (sender_address!= NULL)? sender_address : originator_login);
5120 if (received_protocol == NULL)
5121 received_protocol = string_sprintf("local%s", called_as);
5122 set_process_info("accepting a local non-SMTP message from <%s>",
5126 /* Initialize the session_local_queue-only flag (this will be ignored if
5127 mua_wrapper is set) */
5130 session_local_queue_only = queue_only;
5132 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5133 the spool if so configured. On failure, we must not attempt to send an error
5134 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5135 error code is given.) */
5137 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5139 fprintf(stderr, "exim: insufficient disk space\n");
5140 return EXIT_FAILURE;
5143 /* If this is smtp input of any kind, real or batched, handle the start of the
5146 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5147 because a log line has already been written for all its failure exists
5148 (usually "connection refused: <reason>") and writing another one is
5149 unnecessary clutter. */
5155 if (verify_check_host(&hosts_connection_nolog) == OK)
5156 log_write_selector &= ~L_smtp_connection;
5157 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5158 if (!smtp_start_session())
5161 exim_exit(EXIT_SUCCESS);
5165 /* Otherwise, set up the input size limit here. */
5169 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5170 if (expand_string_message != NULL)
5172 if (thismessage_size_limit == -1)
5173 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5174 "message_size_limit: %s", expand_string_message);
5176 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5177 "message_size_limit: %s", expand_string_message);
5181 /* Loop for several messages when reading SMTP input. If we fork any child
5182 processes, we don't want to wait for them unless synchronous delivery is
5183 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5184 same as SIG_DFL, despite the fact that documentation often lists the default as
5185 "ignore". This is a confusing area. This is what I know:
5187 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5188 processes that complete simply to go away without ever becoming defunct. You
5189 can't then wait for them - but we don't want to wait for them in the
5190 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5191 happen for all OS (e.g. *BSD is different).
5193 But that's not the end of the story. Some (many? all?) systems have the
5194 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5195 has by default, so it seems that the difference is merely one of default
5196 (compare restarting vs non-restarting signals).
5198 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5199 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5200 of the loop below. Paranoia rules.
5202 February 2003: That's *still* not the end of the story. There are now versions
5203 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5204 process then calls waitpid(), a grumble is written to the system log, because
5205 this is logically inconsistent. In other words, it doesn't like the paranoia.
5206 As a consequenc of this, the waitpid() below is now excluded if we are sure
5207 that SIG_IGN works. */
5209 if (!synchronous_delivery)
5212 struct sigaction act;
5213 act.sa_handler = SIG_IGN;
5214 sigemptyset(&(act.sa_mask));
5215 act.sa_flags = SA_NOCLDWAIT;
5216 sigaction(SIGCHLD, &act, NULL);
5218 signal(SIGCHLD, SIG_IGN);
5222 /* Save the current store pool point, for resetting at the start of
5223 each message, and save the real sender address, if any. */
5225 reset_point = store_get(0);
5226 real_sender_address = sender_address;
5228 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5229 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5234 store_reset(reset_point);
5237 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5238 input and build the recipients list, before calling receive_msg() to read the
5239 message proper. Whatever sender address is given in the SMTP transaction is
5240 often ignored for local senders - we use the actual sender, which is normally
5241 either the underlying user running this process or a -f argument provided by
5242 a trusted caller. It is saved in real_sender_address. The test for whether to
5243 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5248 if ((rc = smtp_setup_msg()) > 0)
5250 if (real_sender_address != NULL &&
5251 !receive_check_set_sender(sender_address))
5253 sender_address = raw_sender = real_sender_address;
5254 sender_address_unrewritten = NULL;
5257 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5258 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5259 the very end. The result of the ACL is ignored (as for other non-SMTP
5260 messages). It is run for its potential side effects. */
5262 if (smtp_batched_input && acl_not_smtp_start != NULL)
5264 uschar *user_msg, *log_msg;
5265 enable_dollar_recipients = TRUE;
5266 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5267 &user_msg, &log_msg);
5268 enable_dollar_recipients = FALSE;
5271 /* Now get the data for the message */
5273 more = receive_msg(extract_recipients);
5274 if (message_id[0] == 0)
5277 smtp_log_no_mail(); /* Log no mail if configured */
5278 exim_exit(EXIT_FAILURE);
5283 smtp_log_no_mail(); /* Log no mail if configured */
5284 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5288 /* In the non-SMTP case, we have all the information from the command
5289 line, but must process it in case it is in the more general RFC822
5290 format, and in any case, to detect syntax errors. Also, it appears that
5291 the use of comma-separated lists as single arguments is common, so we
5292 had better support them. */
5298 int count = argc - recipients_arg;
5299 uschar **list = argv + recipients_arg;
5301 /* These options cannot be changed dynamically for non-SMTP messages */
5303 active_local_sender_retain = local_sender_retain;
5304 active_local_from_check = local_from_check;
5306 /* Save before any rewriting */
5308 raw_sender = string_copy(sender_address);
5310 /* Loop for each argument */
5312 for (i = 0; i < count; i++)
5314 int start, end, domain;
5316 uschar *s = list[i];
5318 /* Loop for each comma-separated address */
5322 BOOL finished = FALSE;
5324 uschar *ss = parse_find_address_end(s, FALSE);
5326 if (*ss == ',') *ss = 0; else finished = TRUE;
5328 /* Check max recipients - if -t was used, these aren't recipients */
5330 if (recipients_max > 0 && ++rcount > recipients_max &&
5331 !extract_recipients)
5333 if (error_handling == ERRORS_STDERR)
5335 fprintf(stderr, "exim: too many recipients\n");
5336 exim_exit(EXIT_FAILURE);
5341 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5342 errors_sender_rc : EXIT_FAILURE;
5347 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5349 if (domain == 0 && !allow_unqualified_recipient)
5352 errmess = US"unqualified recipient address not allowed";
5355 if (recipient == NULL)
5357 if (error_handling == ERRORS_STDERR)
5359 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5360 string_printing(list[i]), errmess);
5361 exim_exit(EXIT_FAILURE);
5367 eblock.text1 = string_printing(list[i]);
5368 eblock.text2 = errmess;
5370 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5371 errors_sender_rc : EXIT_FAILURE;
5375 receive_add_recipient(recipient, -1);
5378 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5382 /* Show the recipients when debugging */
5387 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5388 if (recipients_list != NULL)
5390 debug_printf("Recipients:\n");
5391 for (i = 0; i < recipients_count; i++)
5392 debug_printf(" %s\n", recipients_list[i].address);
5396 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5397 ignored; rejecting here would just add complication, and it can just as
5398 well be done later. Allow $recipients to be visible in the ACL. */
5400 if (acl_not_smtp_start != NULL)
5402 uschar *user_msg, *log_msg;
5403 enable_dollar_recipients = TRUE;
5404 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5405 &user_msg, &log_msg);
5406 enable_dollar_recipients = FALSE;
5409 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5410 will just read the headers for the message, and not write anything onto the
5413 message_ended = END_NOTENDED;
5414 more = receive_msg(extract_recipients);
5416 /* more is always FALSE here (not SMTP message) when reading a message
5417 for real; when reading the headers of a message for filter testing,
5418 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5420 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5421 } /* Non-SMTP message reception */
5423 /* If this is a filter testing run, there are headers in store, but
5424 no message on the spool. Run the filtering code in testing mode, setting
5425 the domain to the qualify domain and the local part to the current user,
5426 unless they have been set by options. The prefix and suffix are left unset
5427 unless specified. The the return path is set to to the sender unless it has
5428 already been set from a return-path header in the message. */
5430 if (filter_test != FTEST_NONE)
5432 deliver_domain = (ftest_domain != NULL)?
5433 ftest_domain : qualify_domain_recipient;
5434 deliver_domain_orig = deliver_domain;
5435 deliver_localpart = (ftest_localpart != NULL)?
5436 ftest_localpart : originator_login;
5437 deliver_localpart_orig = deliver_localpart;
5438 deliver_localpart_prefix = ftest_prefix;
5439 deliver_localpart_suffix = ftest_suffix;
5440 deliver_home = originator_home;
5442 if (return_path == NULL)
5444 printf("Return-path copied from sender\n");
5445 return_path = string_copy(sender_address);
5449 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5451 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5453 receive_add_recipient(
5454 string_sprintf("%s%s%s@%s",
5455 (ftest_prefix == NULL)? US"" : ftest_prefix,
5457 (ftest_suffix == NULL)? US"" : ftest_suffix,
5458 deliver_domain), -1);
5460 printf("Recipient = %s\n", recipients_list[0].address);
5461 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5462 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5464 if (chdir("/")) /* Get away from wherever the user is running this from */
5466 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5467 exim_exit(EXIT_FAILURE);
5470 /* Now we run either a system filter test, or a user filter test, or both.
5471 In the latter case, headers added by the system filter will persist and be
5472 available to the user filter. We need to copy the filter variables
5475 if ((filter_test & FTEST_SYSTEM) != 0)
5477 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5478 exim_exit(EXIT_FAILURE);
5481 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5483 if ((filter_test & FTEST_USER) != 0)
5485 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5486 exim_exit(EXIT_FAILURE);
5489 exim_exit(EXIT_SUCCESS);
5492 /* Else act on the result of message reception. We should not get here unless
5493 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5494 will be TRUE. If it is not, check on the number of messages received in this
5497 if (!session_local_queue_only &&
5498 smtp_accept_queue_per_connection > 0 &&
5499 receive_messagecount > smtp_accept_queue_per_connection)
5501 session_local_queue_only = TRUE;
5502 queue_only_reason = 2;
5505 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5506 and queue_only_load is set, check that the load average is below it. If it is
5507 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5508 default), we put the whole session into queue_only mode. It then remains this
5509 way for any subsequent messages on the same SMTP connection. This is a
5510 deliberate choice; even though the load average may fall, it doesn't seem
5511 right to deliver later messages on the same call when not delivering earlier
5512 ones. However, there are odd cases where this is not wanted, so this can be
5513 changed by setting queue_only_load_latch false. */
5515 local_queue_only = session_local_queue_only;
5516 if (!local_queue_only && queue_only_load >= 0)
5518 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5519 if (local_queue_only)
5521 queue_only_reason = 3;
5522 if (queue_only_load_latch) session_local_queue_only = TRUE;
5526 /* If running as an MUA wrapper, all queueing options and freezing options
5530 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5532 /* Log the queueing here, when it will get a message id attached, but
5533 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5536 if (local_queue_only) switch(queue_only_reason)
5539 log_write(L_delay_delivery,
5540 LOG_MAIN, "no immediate delivery: more than %d messages "
5541 "received in one connection", smtp_accept_queue_per_connection);
5545 log_write(L_delay_delivery,
5546 LOG_MAIN, "no immediate delivery: load average %.2f",
5547 (double)load_average/1000.0);
5551 /* Else do the delivery unless the ACL or local_scan() called for queue only
5552 or froze the message. Always deliver in a separate process. A fork failure is
5553 not a disaster, as the delivery will eventually happen on a subsequent queue
5554 run. The search cache must be tidied before the fork, as the parent will
5555 do it before exiting. The child will trigger a lookup failure and
5556 thereby defer the delivery if it tries to use (for example) a cached ldap
5557 connection that the parent has called unbind on. */
5559 else if (!queue_only_policy && !deliver_freeze)
5564 if ((pid = fork()) == 0)
5567 close_unwanted(); /* Close unwanted file descriptors and TLS */
5568 exim_nullstd(); /* Ensure std{in,out,err} exist */
5570 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5571 mode, deliver_drop_privilege is forced TRUE). */
5573 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5575 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5577 /* Control does not return here. */
5580 /* No need to re-exec */
5582 rc = deliver_message(message_id, FALSE, FALSE);
5584 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5585 EXIT_SUCCESS : EXIT_FAILURE);
5590 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5591 "process: %s", strerror(errno));
5594 /* In the parent, wait if synchronous delivery is required. This will
5595 always be the case in MUA wrapper mode. */
5597 else if (synchronous_delivery)
5600 while (wait(&status) != pid);
5601 if ((status & 0x00ff) != 0)
5602 log_write(0, LOG_MAIN|LOG_PANIC,
5603 "process %d crashed with signal %d while delivering %s",
5604 (int)pid, status & 0x00ff, message_id);
5605 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5609 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5610 automatically reaps children (see comments above the loop), clear away any
5611 finished subprocesses here, in case there are lots of messages coming in
5612 from the same source. */
5614 #ifndef SIG_IGN_WORKS
5615 while (waitpid(-1, NULL, WNOHANG) > 0);
5619 exim_exit(EXIT_SUCCESS); /* Never returns */
5620 return 0; /* To stop compiler warning */