1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
15 #if defined(__GLIBC__) && !defined(__UCLIBC__)
16 # include <gnu/libc-version.h>
20 # include <gnutls/gnutls.h>
21 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
26 extern void init_lookup_list(void);
30 /*************************************************
31 * Function interface to store functions *
32 *************************************************/
34 /* We need some real functions to pass to the PCRE regular expression library
35 for store allocation via Exim's store manager. The normal calls are actually
36 macros that pass over location information to make tracing easier. These
37 functions just interface to the standard macro calls. A good compiler will
38 optimize out the tail recursion and so not make them too expensive. There
39 are two sets of functions; one for use when we want to retain the compiled
40 regular expression for a long time; the other for short-term use. */
43 function_store_get(size_t size)
45 return store_get((int)size);
49 function_dummy_free(void *block) { block = block; }
52 function_store_malloc(size_t size)
54 return store_malloc((int)size);
58 function_store_free(void *block)
66 /*************************************************
67 * Enums for cmdline interface *
68 *************************************************/
70 enum commandline_info { CMDINFO_NONE=0,
71 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
76 /*************************************************
77 * Compile regular expression and panic on fail *
78 *************************************************/
80 /* This function is called when failure to compile a regular expression leads
81 to a panic exit. In other cases, pcre_compile() is called directly. In many
82 cases where this function is used, the results of the compilation are to be
83 placed in long-lived store, so we temporarily reset the store management
84 functions that PCRE uses if the use_malloc flag is set.
87 pattern the pattern to compile
88 caseless TRUE if caseless matching is required
89 use_malloc TRUE if compile into malloc store
91 Returns: pointer to the compiled pattern
95 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
98 int options = PCRE_COPT;
103 pcre_malloc = function_store_malloc;
104 pcre_free = function_store_free;
106 if (caseless) options |= PCRE_CASELESS;
107 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
108 pcre_malloc = function_store_get;
109 pcre_free = function_dummy_free;
111 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
112 "%s at offset %d while compiling %s", error, offset, pattern);
119 /*************************************************
120 * Execute regular expression and set strings *
121 *************************************************/
123 /* This function runs a regular expression match, and sets up the pointers to
124 the matched substrings.
127 re the compiled expression
128 subject the subject string
129 options additional PCRE options
130 setup if < 0 do full setup
131 if >= 0 setup from setup+1 onwards,
132 excluding the full matched string
134 Returns: TRUE or FALSE
138 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
140 int ovector[3*(EXPAND_MAXN+1)];
141 uschar * s = string_copy(subject); /* de-constifying */
142 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
143 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
145 if (n == 0) n = EXPAND_MAXN + 1;
149 expand_nmax = (setup < 0)? 0 : setup + 1;
150 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
152 expand_nstring[expand_nmax] = s + ovector[nn];
153 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
163 /*************************************************
164 * Set up processing details *
165 *************************************************/
167 /* Save a text string for dumping when SIGUSR1 is received.
168 Do checks for overruns.
170 Arguments: format and arguments, as for printf()
175 set_process_info(const char *format, ...)
177 int len = sprintf(CS process_info, "%5d ", (int)getpid());
179 va_start(ap, format);
180 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
181 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
182 len = Ustrlen(process_info);
183 process_info[len+0] = '\n';
184 process_info[len+1] = '\0';
185 process_info_len = len + 1;
186 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
190 /***********************************************
191 * Handler for SIGTERM *
192 ***********************************************/
195 term_handler(int sig)
201 /*************************************************
202 * Handler for SIGUSR1 *
203 *************************************************/
205 /* SIGUSR1 causes any exim process to write to the process log details of
206 what it is currently doing. It will only be used if the OS is capable of
207 setting up a handler that causes automatic restarting of any system call
208 that is in progress at the time.
210 This function takes care to be signal-safe.
212 Argument: the signal number (SIGUSR1)
217 usr1_handler(int sig)
221 os_restarting_signal(sig, usr1_handler);
223 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
225 /* If we are already running as the Exim user, try to create it in the
226 current process (assuming spool_directory exists). Otherwise, if we are
227 root, do the creation in an exim:exim subprocess. */
229 int euid = geteuid();
230 if (euid == exim_uid)
231 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
232 else if (euid == root_uid)
233 fd = log_create_as_exim(process_log_path);
236 /* If we are neither exim nor root, or if we failed to create the log file,
237 give up. There is not much useful we can do with errors, since we don't want
238 to disrupt whatever is going on outside the signal handler. */
242 (void)write(fd, process_info, process_info_len);
248 /*************************************************
250 *************************************************/
252 /* This handler is enabled most of the time that Exim is running. The handler
253 doesn't actually get used unless alarm() has been called to set a timer, to
254 place a time limit on a system call of some kind. When the handler is run, it
257 There are some other SIGALRM handlers that are used in special cases when more
258 than just a flag setting is required; for example, when reading a message's
259 input. These are normally set up in the code module that uses them, and the
260 SIGALRM handler is reset to this one afterwards.
262 Argument: the signal value (SIGALRM)
267 sigalrm_handler(int sig)
269 sig = sig; /* Keep picky compilers happy */
271 os_non_restarting_signal(SIGALRM, sigalrm_handler);
276 /*************************************************
277 * Sleep for a fractional time interval *
278 *************************************************/
280 /* This function is called by millisleep() and exim_wait_tick() to wait for a
281 period of time that may include a fraction of a second. The coding is somewhat
282 tedious. We do not expect setitimer() ever to fail, but if it does, the process
283 will wait for ever, so we panic in this instance. (There was a case of this
284 when a bug in a function that calls milliwait() caused it to pass invalid data.
285 That's when I added the check. :-)
287 We assume it to be not worth sleeping for under 100us; this value will
288 require revisiting as hardware advances. This avoids the issue of
289 a zero-valued timer setting meaning "never fire".
291 Argument: an itimerval structure containing the interval
296 milliwait(struct itimerval *itval)
299 sigset_t old_sigmask;
301 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
303 (void)sigemptyset(&sigmask); /* Empty mask */
304 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
305 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
306 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
307 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
308 "setitimer() failed: %s", strerror(errno));
309 (void)sigfillset(&sigmask); /* All signals */
310 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
311 (void)sigsuspend(&sigmask); /* Until SIGALRM */
312 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
318 /*************************************************
319 * Millisecond sleep function *
320 *************************************************/
322 /* The basic sleep() function has a granularity of 1 second, which is too rough
323 in some cases - for example, when using an increasing delay to slow down
326 Argument: number of millseconds
333 struct itimerval itval;
334 itval.it_interval.tv_sec = 0;
335 itval.it_interval.tv_usec = 0;
336 itval.it_value.tv_sec = msec/1000;
337 itval.it_value.tv_usec = (msec % 1000) * 1000;
343 /*************************************************
344 * Compare microsecond times *
345 *************************************************/
352 Returns: -1, 0, or +1
356 exim_tvcmp(struct timeval *t1, struct timeval *t2)
358 if (t1->tv_sec > t2->tv_sec) return +1;
359 if (t1->tv_sec < t2->tv_sec) return -1;
360 if (t1->tv_usec > t2->tv_usec) return +1;
361 if (t1->tv_usec < t2->tv_usec) return -1;
368 /*************************************************
369 * Clock tick wait function *
370 *************************************************/
372 /* Exim uses a time + a pid to generate a unique identifier in two places: its
373 message IDs, and in file names for maildir deliveries. Because some OS now
374 re-use pids within the same second, sub-second times are now being used.
375 However, for absolute certainty, we must ensure the clock has ticked before
376 allowing the relevant process to complete. At the time of implementation of
377 this code (February 2003), the speed of processors is such that the clock will
378 invariably have ticked already by the time a process has done its job. This
379 function prepares for the time when things are faster - and it also copes with
380 clocks that go backwards.
383 then_tv A timeval which was used to create uniqueness; its usec field
384 has been rounded down to the value of the resolution.
385 We want to be sure the current time is greater than this.
386 resolution The resolution that was used to divide the microseconds
387 (1 for maildir, larger for message ids)
393 exim_wait_tick(struct timeval *then_tv, int resolution)
395 struct timeval now_tv;
396 long int now_true_usec;
398 (void)gettimeofday(&now_tv, NULL);
399 now_true_usec = now_tv.tv_usec;
400 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
402 if (exim_tvcmp(&now_tv, then_tv) <= 0)
404 struct itimerval itval;
405 itval.it_interval.tv_sec = 0;
406 itval.it_interval.tv_usec = 0;
407 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
408 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
410 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
411 negative value for the microseconds is possible only in the case when "now"
412 is more than a second less than "then". That means that itval.it_value.tv_sec
413 is greater than zero. The following correction is therefore safe. */
415 if (itval.it_value.tv_usec < 0)
417 itval.it_value.tv_usec += 1000000;
418 itval.it_value.tv_sec -= 1;
421 DEBUG(D_transport|D_receive)
423 if (!f.running_in_test_harness)
425 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
426 then_tv->tv_sec, (long) then_tv->tv_usec,
427 now_tv.tv_sec, (long) now_tv.tv_usec);
428 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
429 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
440 /*************************************************
441 * Call fopen() with umask 777 and adjust mode *
442 *************************************************/
444 /* Exim runs with umask(0) so that files created with open() have the mode that
445 is specified in the open() call. However, there are some files, typically in
446 the spool directory, that are created with fopen(). They end up world-writeable
447 if no precautions are taken. Although the spool directory is not accessible to
448 the world, this is an untidiness. So this is a wrapper function for fopen()
449 that sorts out the mode of the created file.
452 filename the file name
453 options the fopen() options
454 mode the required mode
456 Returns: the fopened FILE or NULL
460 modefopen(const uschar *filename, const char *options, mode_t mode)
462 mode_t saved_umask = umask(0777);
463 FILE *f = Ufopen(filename, options);
464 (void)umask(saved_umask);
465 if (f != NULL) (void)fchmod(fileno(f), mode);
472 /*************************************************
473 * Ensure stdin, stdout, and stderr exist *
474 *************************************************/
476 /* Some operating systems grumble if an exec() happens without a standard
477 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
478 file will be opened and will use these fd values, and then some other bit of
479 code will assume, for example, that it can write error messages to stderr.
480 This function ensures that fds 0, 1, and 2 are open if they do not already
481 exist, by connecting them to /dev/null.
483 This function is also used to ensure that std{in,out,err} exist at all times,
484 so that if any library that Exim calls tries to use them, it doesn't crash.
496 for (i = 0; i <= 2; i++)
498 if (fstat(i, &statbuf) < 0 && errno == EBADF)
500 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
501 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
502 string_open_failed(errno, "/dev/null"));
503 if (devnull != i) (void)dup2(devnull, i);
506 if (devnull > 2) (void)close(devnull);
512 /*************************************************
513 * Close unwanted file descriptors for delivery *
514 *************************************************/
516 /* This function is called from a new process that has been forked to deliver
517 an incoming message, either directly, or using exec.
519 We want any smtp input streams to be closed in this new process. However, it
520 has been observed that using fclose() here causes trouble. When reading in -bS
521 input, duplicate copies of messages have been seen. The files will be sharing a
522 file pointer with the parent process, and it seems that fclose() (at least on
523 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
524 least sometimes. Hence we go for closing the underlying file descriptors.
526 If TLS is active, we want to shut down the TLS library, but without molesting
527 the parent's SSL connection.
529 For delivery of a non-SMTP message, we want to close stdin and stdout (and
530 stderr unless debugging) because the calling process might have set them up as
531 pipes and be waiting for them to close before it waits for the submission
532 process to terminate. If they aren't closed, they hold up the calling process
533 until the initial delivery process finishes, which is not what we want.
535 Exception: We do want it for synchronous delivery!
537 And notwithstanding all the above, if D_resolver is set, implying resolver
538 debugging, leave stdout open, because that's where the resolver writes its
541 When we close stderr (which implies we've also closed stdout), we also get rid
542 of any controlling terminal.
554 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
556 (void)close(fileno(smtp_in));
557 (void)close(fileno(smtp_out));
562 (void)close(0); /* stdin */
563 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
564 if (debug_selector == 0) /* stderr */
566 if (!f.synchronous_delivery)
579 /*************************************************
581 *************************************************/
583 /* This function sets a new uid and gid permanently, optionally calling
584 initgroups() to set auxiliary groups. There are some special cases when running
585 Exim in unprivileged modes. In these situations the effective uid will not be
586 root; if we already have the right effective uid/gid, and don't need to
587 initialize any groups, leave things as they are.
592 igflag TRUE if initgroups() wanted
593 msg text to use in debugging output and failure log
595 Returns: nothing; bombs out on failure
599 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
601 uid_t euid = geteuid();
602 gid_t egid = getegid();
604 if (euid == root_uid || euid != uid || egid != gid || igflag)
606 /* At least one OS returns +1 for initgroups failure, so just check for
611 struct passwd *pw = getpwuid(uid);
613 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
614 "no passwd entry for uid=%ld", (long int)uid);
616 if (initgroups(pw->pw_name, gid) != 0)
617 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
618 (long int)uid, strerror(errno));
621 if (setgid(gid) < 0 || setuid(uid) < 0)
622 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
623 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
626 /* Debugging output included uid/gid and all groups */
630 int group_count, save_errno;
631 gid_t group_list[NGROUPS_MAX];
632 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
633 (long int)geteuid(), (long int)getegid(), (long int)getpid());
634 group_count = getgroups(NGROUPS_MAX, group_list);
636 debug_printf(" auxiliary group list:");
640 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
642 else if (group_count < 0)
643 debug_printf(" <error: %s>", strerror(save_errno));
644 else debug_printf(" <none>");
652 /*************************************************
654 *************************************************/
656 /* Exim exits via this function so that it always clears up any open
662 Returns: does not return
666 exim_exit(int rc, const uschar * process)
670 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
671 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
672 process ? "(" : "", process, process ? ") " : "", rc);
678 /* Print error string, then die */
680 exim_fail(const char * fmt, ...)
684 vfprintf(stderr, fmt, ap);
690 /*************************************************
691 * Extract port from host address *
692 *************************************************/
694 /* Called to extract the port from the values given to -oMa and -oMi.
695 It also checks the syntax of the address, and terminates it before the
696 port data when a port is extracted.
699 address the address, with possible port on the end
701 Returns: the port, or zero if there isn't one
702 bombs out on a syntax error
706 check_port(uschar *address)
708 int port = host_address_extract_port(address);
709 if (string_is_ip_address(address, NULL) == 0)
710 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
716 /*************************************************
717 * Test/verify an address *
718 *************************************************/
720 /* This function is called by the -bv and -bt code. It extracts a working
721 address from a full RFC 822 address. This isn't really necessary per se, but it
722 has the effect of collapsing source routes.
726 flags flag bits for verify_address()
727 exit_value to be set for failures
733 test_address(uschar *s, int flags, int *exit_value)
735 int start, end, domain;
736 uschar *parse_error = NULL;
737 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
741 fprintf(stdout, "syntax error: %s\n", parse_error);
746 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
747 -1, -1, NULL, NULL, NULL);
748 if (rc == FAIL) *exit_value = 2;
749 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
755 /*************************************************
756 * Show supported features *
757 *************************************************/
760 show_db_version(FILE * f)
762 #ifdef DB_VERSION_STRING
765 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
766 fprintf(f, " Runtime: %s\n",
767 db_version(NULL, NULL, NULL));
770 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
772 #elif defined(BTREEVERSION) && defined(HASHVERSION)
774 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
776 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
779 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
780 fprintf(f, "Probably ndbm\n");
781 #elif defined(USE_TDB)
782 fprintf(f, "Using tdb\n");
785 fprintf(f, "Probably GDBM (native mode)\n");
787 fprintf(f, "Probably GDBM (compatibility mode)\n");
793 /* This function is called for -bV/--version and for -d to output the optional
794 features of the current Exim binary.
796 Arguments: a FILE for printing
801 show_whats_supported(FILE * fp)
805 DEBUG(D_any) {} else show_db_version(fp);
807 fprintf(fp, "Support for:");
808 #ifdef SUPPORT_CRYPTEQ
809 fprintf(fp, " crypteq");
812 fprintf(fp, " iconv()");
815 fprintf(fp, " IPv6");
817 #ifdef HAVE_SETCLASSRESOURCES
818 fprintf(fp, " use_setclassresources");
824 fprintf(fp, " Perl");
827 fprintf(fp, " Expand_dlfunc");
829 #ifdef USE_TCP_WRAPPERS
830 fprintf(fp, " TCPwrappers");
834 fprintf(fp, " GnuTLS");
836 fprintf(fp, " OpenSSL");
839 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
840 fprintf(fp, " translate_ip_address");
842 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
843 fprintf(fp, " move_frozen_messages");
845 #ifdef WITH_CONTENT_SCAN
846 fprintf(fp, " Content_Scanning");
849 fprintf(fp, " DANE");
852 fprintf(fp, " DKIM");
854 #ifndef DISABLE_DNSSEC
855 fprintf(fp, " DNSSEC");
857 #ifndef DISABLE_EVENT
858 fprintf(fp, " Event");
861 fprintf(fp, " I18N");
864 fprintf(fp, " OCSP");
867 fprintf(fp, " PRDR");
870 fprintf(fp, " PROXY");
873 fprintf(fp, " SOCKS");
880 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
882 #ifdef EXPERIMENTAL_LMDB
883 fprintf(fp, " Experimental_LMDB");
885 #ifdef EXPERIMENTAL_QUEUEFILE
886 fprintf(fp, " Experimental_QUEUEFILE");
888 #ifdef EXPERIMENTAL_SRS
889 fprintf(fp, " Experimental_SRS");
891 #ifdef EXPERIMENTAL_ARC
892 fprintf(fp, " Experimental_ARC");
894 #ifdef EXPERIMENTAL_BRIGHTMAIL
895 fprintf(fp, " Experimental_Brightmail");
897 #ifdef EXPERIMENTAL_DCC
898 fprintf(fp, " Experimental_DCC");
900 #ifdef EXPERIMENTAL_DMARC
901 fprintf(fp, " Experimental_DMARC");
903 #ifdef EXPERIMENTAL_DSN_INFO
904 fprintf(fp, " Experimental_DSN_info");
906 #ifdef EXPERIMENTAL_REQUIRETLS
907 fprintf(fp, " Experimental_REQUIRETLS");
911 fprintf(fp, "Lookups (built-in):");
912 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
913 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
915 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
918 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
919 fprintf(fp, " dbm dbmjz dbmnz");
921 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
922 fprintf(fp, " dnsdb");
924 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
925 fprintf(fp, " dsearch");
927 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
928 fprintf(fp, " ibase");
930 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
931 fprintf(fp, " ldap ldapdn ldapm");
933 #ifdef EXPERIMENTAL_LMDB
934 fprintf(fp, " lmdb");
936 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
937 fprintf(fp, " mysql");
939 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
940 fprintf(fp, " nis nis0");
942 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
943 fprintf(fp, " nisplus");
945 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
946 fprintf(fp, " oracle");
948 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
949 fprintf(fp, " passwd");
951 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
952 fprintf(fp, " pgsql");
954 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
955 fprintf(fp, " redis");
957 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
958 fprintf(fp, " sqlite");
960 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
961 fprintf(fp, " testdb");
963 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
964 fprintf(fp, " whoson");
968 auth_show_supported(fp);
969 route_show_supported(fp);
970 transport_show_supported(fp);
972 #ifdef WITH_CONTENT_SCAN
973 malware_show_supported(fp);
976 if (fixed_never_users[0] > 0)
979 fprintf(fp, "Fixed never_users: ");
980 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
981 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
982 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
985 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
987 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
989 /* Everything else is details which are only worth reporting when debugging.
990 Perhaps the tls_version_report should move into this too. */
995 /* clang defines __GNUC__ (at least, for me) so test for it first */
996 #if defined(__clang__)
997 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
998 #elif defined(__GNUC__)
999 fprintf(fp, "Compiler: GCC [%s]\n",
1003 "? unknown version ?"
1007 fprintf(fp, "Compiler: <unknown>\n");
1010 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1011 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1012 __GLIBC__, __GLIBC_MINOR__);
1013 if (__GLIBC_PREREQ(2, 1))
1014 fprintf(fp, " Runtime: %s\n",
1015 gnu_get_libc_version());
1018 show_db_version(fp);
1021 tls_version_report(fp);
1024 utf8_version_report(fp);
1027 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1028 if (authi->version_report)
1029 (*authi->version_report)(fp);
1031 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1032 characters; unless it's an ancient version of PCRE in which case it
1034 #ifndef PCRE_PRERELEASE
1035 # define PCRE_PRERELEASE
1038 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1039 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1041 PCRE_MAJOR, PCRE_MINOR,
1042 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1045 #undef EXPAND_AND_QUOTE
1048 for (i = 0; i < lookup_list_count; i++)
1049 if (lookup_list[i]->version_report)
1050 lookup_list[i]->version_report(fp);
1052 #ifdef WHITELIST_D_MACROS
1053 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1055 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1057 #ifdef TRUSTED_CONFIG_LIST
1058 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1060 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1067 /*************************************************
1068 * Show auxiliary information about Exim *
1069 *************************************************/
1072 show_exim_information(enum commandline_info request, FILE *stream)
1079 fprintf(stream, "Oops, something went wrong.\n");
1083 "The -bI: flag takes a string indicating which information to provide.\n"
1084 "If the string is not recognised, you'll get this help (on stderr).\n"
1086 " exim -bI:help this information\n"
1087 " exim -bI:dscp list of known dscp value keywords\n"
1088 " exim -bI:sieve list of supported sieve extensions\n"
1092 for (pp = exim_sieve_extension_list; *pp; ++pp)
1093 fprintf(stream, "%s\n", *pp);
1096 dscp_list_to_stream(stream);
1102 /*************************************************
1103 * Quote a local part *
1104 *************************************************/
1106 /* This function is used when a sender address or a From: or Sender: header
1107 line is being created from the caller's login, or from an authenticated_id. It
1108 applies appropriate quoting rules for a local part.
1110 Argument: the local part
1111 Returns: the local part, quoted if necessary
1115 local_part_quote(uschar *lpart)
1117 BOOL needs_quote = FALSE;
1121 for (t = lpart; !needs_quote && *t != 0; t++)
1123 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1124 (*t != '.' || t == lpart || t[1] == 0);
1127 if (!needs_quote) return lpart;
1129 g = string_catn(NULL, US"\"", 1);
1133 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1136 g = string_cat(g, lpart);
1139 g = string_catn(g, lpart, nq - lpart);
1140 g = string_catn(g, US"\\", 1);
1141 g = string_catn(g, nq, 1);
1145 g = string_catn(g, US"\"", 1);
1146 return string_from_gstring(g);
1152 /*************************************************
1153 * Load readline() functions *
1154 *************************************************/
1156 /* This function is called from testing executions that read data from stdin,
1157 but only when running as the calling user. Currently, only -be does this. The
1158 function loads the readline() function library and passes back the functions.
1159 On some systems, it needs the curses library, so load that too, but try without
1160 it if loading fails. All this functionality has to be requested at build time.
1163 fn_readline_ptr pointer to where to put the readline pointer
1164 fn_addhist_ptr pointer to where to put the addhistory function
1166 Returns: the dlopen handle or NULL on failure
1170 set_readline(char * (**fn_readline_ptr)(const char *),
1171 void (**fn_addhist_ptr)(const char *))
1174 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1176 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1177 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1179 if (dlhandle != NULL)
1181 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1182 * char * readline (const char *prompt);
1183 * void add_history (const char *string);
1185 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1186 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1190 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1199 /*************************************************
1200 * Get a line from stdin for testing things *
1201 *************************************************/
1203 /* This function is called when running tests that can take a number of lines
1204 of input (for example, -be and -bt). It handles continuations and trailing
1205 spaces. And prompting and a blank line output on eof. If readline() is in use,
1206 the arguments are non-NULL and provide the relevant functions.
1209 fn_readline readline function or NULL
1210 fn_addhist addhist function or NULL
1212 Returns: pointer to dynamic memory, or NULL at end of file
1216 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1221 if (!fn_readline) { 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 g = string_catn(g, p, ss - p);
1259 if (fn_readline) free(readline_line);
1262 /* g can only be NULL if ss==p */
1263 if (ss == p || g->s[g->ptr-1] != '\\')
1267 (void) string_from_gstring(g);
1270 if (!g) printf("\n");
1271 return string_from_gstring(g);
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 variants */
1294 if (Ustrcmp(progname, US"-mailq") == 0)
1296 "mailq - list the contents of the mail queue\n\n"
1297 "For a list of options, see the Exim documentation.\n");
1299 /* Generic usage - we output this whatever happens */
1301 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1302 "not directly from a shell command line. Options and/or arguments control\n"
1303 "what it does when called. For a list of options, see the Exim documentation.\n");
1308 /*************************************************
1309 * Validate that the macros given are okay *
1310 *************************************************/
1312 /* Typically, Exim will drop privileges if macros are supplied. In some
1313 cases, we want to not do so.
1315 Arguments: opt_D_used - true if the commandline had a "-D" option
1316 Returns: true if trusted, false otherwise
1320 macros_trusted(BOOL opt_D_used)
1322 #ifdef WHITELIST_D_MACROS
1324 uschar *whitelisted, *end, *p, **whites, **w;
1325 int white_count, i, n;
1327 BOOL prev_char_item, found;
1332 #ifndef WHITELIST_D_MACROS
1336 /* We only trust -D overrides for some invoking users:
1337 root, the exim run-time user, the optional config owner user.
1338 I don't know why config-owner would be needed, but since they can own the
1339 config files anyway, there's no security risk to letting them override -D. */
1340 if ( ! ((real_uid == root_uid)
1341 || (real_uid == exim_uid)
1342 #ifdef CONFIGURE_OWNER
1343 || (real_uid == config_uid)
1347 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1351 /* Get a list of macros which are whitelisted */
1352 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1353 prev_char_item = FALSE;
1355 for (p = whitelisted; *p != '\0'; ++p)
1357 if (*p == ':' || isspace(*p))
1362 prev_char_item = FALSE;
1365 if (!prev_char_item)
1366 prev_char_item = TRUE;
1373 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1374 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1379 if (i == white_count)
1381 while (*p != '\0' && p < end)
1387 /* The list of commandline macros should be very short.
1388 Accept the N*M complexity. */
1389 for (m = macros_user; m; m = m->next) if (m->command_line)
1392 for (w = whites; *w; ++w)
1393 if (Ustrcmp(*w, m->name) == 0)
1400 if (!m->replacement)
1402 if ((len = m->replen) == 0)
1404 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1405 0, PCRE_EOPT, NULL, 0);
1408 if (n != PCRE_ERROR_NOMATCH)
1409 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1413 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1419 /*************************************************
1420 * Expansion testing *
1421 *************************************************/
1423 /* Expand and print one item, doing macro-processing.
1426 item line for expansion
1430 expansion_test_line(uschar * line)
1435 Ustrncpy(big_buffer, line, big_buffer_size);
1436 big_buffer[big_buffer_size-1] = '\0';
1437 len = Ustrlen(big_buffer);
1439 (void) macros_expand(0, &len, &dummy_macexp);
1441 if (isupper(big_buffer[0]))
1443 if (macro_read_assignment(big_buffer))
1444 printf("Defined macro '%s'\n", mlast->name);
1447 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1448 else printf("Failed: %s\n", expand_string_message);
1453 /*************************************************
1454 * Entry point and high-level code *
1455 *************************************************/
1457 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1458 the appropriate action. All the necessary functions are present in the one
1459 binary. I originally thought one should split it up, but it turns out that so
1460 much of the apparatus is needed in each chunk that one might as well just have
1461 it all available all the time, which then makes the coding easier as well.
1464 argc count of entries in argv
1465 argv argument strings, with argv[0] being the program name
1467 Returns: EXIT_SUCCESS if terminated successfully
1468 EXIT_FAILURE otherwise, except when a message has been sent
1469 to the sender, and -oee was given
1473 main(int argc, char **cargv)
1475 uschar **argv = USS cargv;
1476 int arg_receive_timeout = -1;
1477 int arg_smtp_receive_timeout = -1;
1478 int arg_error_handling = error_handling;
1479 int filter_sfd = -1;
1480 int filter_ufd = -1;
1483 int list_queue_option = 0;
1485 int msg_action_arg = -1;
1486 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1487 int queue_only_reason = 0;
1489 int perl_start_option = 0;
1491 int recipients_arg = argc;
1492 int sender_address_domain = 0;
1493 int test_retry_arg = -1;
1494 int test_rewrite_arg = -1;
1495 BOOL arg_queue_only = FALSE;
1496 BOOL bi_option = FALSE;
1497 BOOL checking = FALSE;
1498 BOOL count_queue = FALSE;
1499 BOOL expansion_test = FALSE;
1500 BOOL extract_recipients = FALSE;
1501 BOOL flag_G = FALSE;
1502 BOOL flag_n = FALSE;
1503 BOOL forced_delivery = FALSE;
1504 BOOL f_end_dot = FALSE;
1505 BOOL deliver_give_up = FALSE;
1506 BOOL list_queue = FALSE;
1507 BOOL list_options = FALSE;
1508 BOOL list_config = FALSE;
1509 BOOL local_queue_only;
1511 BOOL one_msg_action = FALSE;
1512 BOOL opt_D_used = FALSE;
1513 BOOL queue_only_set = FALSE;
1514 BOOL receiving_message = TRUE;
1515 BOOL sender_ident_set = FALSE;
1516 BOOL session_local_queue_only;
1518 BOOL removed_privilege = FALSE;
1519 BOOL usage_wanted = FALSE;
1520 BOOL verify_address_mode = FALSE;
1521 BOOL verify_as_sender = FALSE;
1522 BOOL version_printed = FALSE;
1523 uschar *alias_arg = NULL;
1524 uschar *called_as = US"";
1525 uschar *cmdline_syslog_name = NULL;
1526 uschar *start_queue_run_id = NULL;
1527 uschar *stop_queue_run_id = NULL;
1528 uschar *expansion_test_message = NULL;
1529 uschar *ftest_domain = NULL;
1530 uschar *ftest_localpart = NULL;
1531 uschar *ftest_prefix = NULL;
1532 uschar *ftest_suffix = NULL;
1533 uschar *log_oneline = NULL;
1534 uschar *malware_test_file = NULL;
1535 uschar *real_sender_address;
1536 uschar *originator_home = US"/";
1541 struct stat statbuf;
1542 pid_t passed_qr_pid = (pid_t)0;
1543 int passed_qr_pipe = -1;
1544 gid_t group_list[NGROUPS_MAX];
1546 /* For the -bI: flag */
1547 enum commandline_info info_flag = CMDINFO_NONE;
1548 BOOL info_stdout = FALSE;
1550 /* Possible options for -R and -S */
1552 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1554 /* Need to define this in case we need to change the environment in order
1555 to get rid of a bogus time zone. We have to make it char rather than uschar
1556 because some OS define it in /usr/include/unistd.h. */
1558 extern char **environ;
1560 /* If the Exim user and/or group and/or the configuration file owner/group were
1561 defined by ref:name at build time, we must now find the actual uid/gid values.
1562 This is a feature to make the lives of binary distributors easier. */
1564 #ifdef EXIM_USERNAME
1565 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1568 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1570 /* If ref:name uses a number as the name, route_finduser() returns
1571 TRUE with exim_uid set and pw coerced to NULL. */
1573 exim_gid = pw->pw_gid;
1574 #ifndef EXIM_GROUPNAME
1577 "exim: ref:name should specify a usercode, not a group.\n"
1578 "exim: can't let you get away with it unless you also specify a group.\n");
1582 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1585 #ifdef EXIM_GROUPNAME
1586 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1587 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1590 #ifdef CONFIGURE_OWNERNAME
1591 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1592 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1593 CONFIGURE_OWNERNAME);
1596 /* We default the system_filter_user to be the Exim run-time user, as a
1597 sane non-root value. */
1598 system_filter_uid = exim_uid;
1600 #ifdef CONFIGURE_GROUPNAME
1601 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1602 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1603 CONFIGURE_GROUPNAME);
1606 /* In the Cygwin environment, some initialization used to need doing.
1607 It was fudged in by means of this macro; now no longer but we'll leave
1608 it in case of others. */
1614 /* Check a field which is patched when we are running Exim within its
1615 testing harness; do a fast initial check, and then the whole thing. */
1617 f.running_in_test_harness =
1618 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1619 if (f.running_in_test_harness)
1622 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1623 at the start of a program; however, it seems that some environments do not
1624 follow this. A "strange" locale can affect the formatting of timestamps, so we
1627 setlocale(LC_ALL, "C");
1629 /* Set up the default handler for timing using alarm(). */
1631 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1633 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1634 because store_malloc writes a log entry on failure. */
1636 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1637 exim_fail("exim: failed to get store for log buffer\n");
1639 /* Initialize the default log options. */
1641 bits_set(log_selector, log_selector_size, log_default);
1643 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1644 NULL when the daemon is run and the file is closed. We have to use this
1645 indirection, because some systems don't allow writing to the variable "stderr".
1648 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1650 /* Arrange for the PCRE regex library to use our store functions. Note that
1651 the normal calls are actually macros that add additional arguments for
1652 debugging purposes so we have to assign specially constructed functions here.
1653 The default is to use store in the stacking pool, but this is overridden in the
1654 regex_must_compile() function. */
1656 pcre_malloc = function_store_get;
1657 pcre_free = function_dummy_free;
1659 /* Ensure there is a big buffer for temporary use in several places. It is put
1660 in malloc store so that it can be freed for enlargement if necessary. */
1662 big_buffer = store_malloc(big_buffer_size);
1664 /* Set up the handler for the data request signal, and set the initial
1665 descriptive text. */
1667 set_process_info("initializing");
1668 os_restarting_signal(SIGUSR1, usr1_handler);
1670 /* If running in a dockerized environment, the TERM signal is only
1671 delegated to the PID 1 if we request it by setting an signal handler */
1672 if (getpid() == 1) signal(SIGTERM, term_handler);
1674 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1675 in the daemon code. For the rest of Exim's uses, we ignore it. */
1677 signal(SIGHUP, SIG_IGN);
1679 /* We don't want to die on pipe errors as the code is written to handle
1680 the write error instead. */
1682 signal(SIGPIPE, SIG_IGN);
1684 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1685 set to SIG_IGN. This causes subprocesses that complete before the parent
1686 process waits for them not to hang around, so when Exim calls wait(), nothing
1687 is there. The wait() code has been made robust against this, but let's ensure
1688 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1689 ending status. We use sigaction rather than plain signal() on those OS where
1690 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1691 problem on AIX with this.) */
1695 struct sigaction act;
1696 act.sa_handler = SIG_DFL;
1697 sigemptyset(&(act.sa_mask));
1699 sigaction(SIGCHLD, &act, NULL);
1702 signal(SIGCHLD, SIG_DFL);
1705 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1710 /* Set up the version number. Set up the leading 'E' for the external form of
1711 message ids, set the pointer to the internal form, and initialize it to
1712 indicate no message being processed. */
1715 message_id_option[0] = '-';
1716 message_id_external = message_id_option + 1;
1717 message_id_external[0] = 'E';
1718 message_id = message_id_external + 1;
1721 /* Set the umask to zero so that any files Exim creates using open() are
1722 created with the modes that it specifies. NOTE: Files created with fopen() have
1723 a problem, which was not recognized till rather late (February 2006). With this
1724 umask, such files will be world writeable. (They are all content scanning files
1725 in the spool directory, which isn't world-accessible, so this is not a
1726 disaster, but it's untidy.) I don't want to change this overall setting,
1727 however, because it will interact badly with the open() calls. Instead, there's
1728 now a function called modefopen() that fiddles with the umask while calling
1733 /* Precompile the regular expression for matching a message id. Keep this in
1734 step with the code that generates ids in the accept.c module. We need to do
1735 this here, because the -M options check their arguments for syntactic validity
1736 using mac_ismsgid, which uses this. */
1739 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1741 /* Precompile the regular expression that is used for matching an SMTP error
1742 code, possibly extended, at the start of an error message. Note that the
1743 terminating whitespace character is included. */
1746 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1749 #ifdef WHITELIST_D_MACROS
1750 /* Precompile the regular expression used to filter the content of macros
1751 given to -D for permissibility. */
1753 regex_whitelisted_macro =
1754 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1757 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1759 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1760 this seems to be a generally accepted convention, since one finds symbolic
1761 links called "mailq" in standard OS configurations. */
1763 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1764 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1767 receiving_message = FALSE;
1768 called_as = US"-mailq";
1771 /* If the program is called as "rmail" treat it as equivalent to
1772 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1773 i.e. preventing a single dot on a line from terminating the message, and
1774 returning with zero return code, even in cases of error (provided an error
1775 message has been sent). */
1777 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1778 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1781 called_as = US"-rmail";
1782 errors_sender_rc = EXIT_SUCCESS;
1785 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1786 this is a smail convention. */
1788 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1789 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1791 smtp_input = smtp_batched_input = TRUE;
1792 called_as = US"-rsmtp";
1795 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1796 this is a smail convention. */
1798 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1799 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1802 receiving_message = FALSE;
1803 called_as = US"-runq";
1806 /* If the program is called as "newaliases" treat it as equivalent to
1807 "exim -bi"; this is a sendmail convention. */
1809 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1810 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1813 receiving_message = FALSE;
1814 called_as = US"-newaliases";
1817 /* Save the original effective uid for a couple of uses later. It should
1818 normally be root, but in some esoteric environments it may not be. */
1820 original_euid = geteuid();
1822 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1823 to be the same as the real ones. This makes a difference only if Exim is setuid
1824 (or setgid) to something other than root, which could be the case in some
1825 special configurations. */
1827 real_uid = getuid();
1828 real_gid = getgid();
1830 if (real_uid == root_uid)
1832 if ((rv = setgid(real_gid)))
1833 exim_fail("exim: setgid(%ld) failed: %s\n",
1834 (long int)real_gid, strerror(errno));
1835 if ((rv = setuid(real_uid)))
1836 exim_fail("exim: setuid(%ld) failed: %s\n",
1837 (long int)real_uid, strerror(errno));
1840 /* If neither the original real uid nor the original euid was root, Exim is
1841 running in an unprivileged state. */
1843 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1845 /* Scan the program's arguments. Some can be dealt with right away; others are
1846 simply recorded for checking and handling afterwards. Do a high-level switch
1847 on the second character (the one after '-'), to save some effort. */
1849 for (i = 1; i < argc; i++)
1851 BOOL badarg = FALSE;
1852 uschar *arg = argv[i];
1856 /* An argument not starting with '-' is the start of a recipients list;
1857 break out of the options-scanning loop. */
1865 /* An option consisting of -- terminates the options */
1867 if (Ustrcmp(arg, "--") == 0)
1869 recipients_arg = i + 1;
1873 /* Handle flagged options */
1875 switchchar = arg[1];
1878 /* Make all -ex options synonymous with -oex arguments, since that
1879 is assumed by various callers. Also make -qR options synonymous with -R
1880 options, as that seems to be required as well. Allow for -qqR too, and
1881 the same for -S options. */
1883 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1884 Ustrncmp(arg+1, "qR", 2) == 0 ||
1885 Ustrncmp(arg+1, "qS", 2) == 0)
1887 switchchar = arg[2];
1890 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1892 switchchar = arg[3];
1894 f.queue_2stage = TRUE;
1897 /* Make -r synonymous with -f, since it is a documented alias */
1899 else if (arg[1] == 'r') switchchar = 'f';
1901 /* Make -ov synonymous with -v */
1903 else if (Ustrcmp(arg, "-ov") == 0)
1909 /* deal with --option_aliases */
1910 else if (switchchar == '-')
1912 if (Ustrcmp(argrest, "help") == 0)
1914 usage_wanted = TRUE;
1917 else if (Ustrcmp(argrest, "version") == 0)
1924 /* High-level switch on active initial letter */
1929 /* sendmail uses -Ac and -Am to control which .cf file is used;
1932 if (*argrest == '\0') { badarg = TRUE; break; }
1935 BOOL ignore = FALSE;
1940 if (*(argrest + 1) == '\0')
1944 if (!ignore) { badarg = TRUE; break; }
1948 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1949 so has no need of it. */
1952 if (*argrest == 0) i++; /* Skip over the type */
1957 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1959 /* -bd: Run in daemon mode, awaiting SMTP connections.
1960 -bdf: Ditto, but in the foreground.
1963 if (*argrest == 'd')
1965 f.daemon_listen = TRUE;
1966 if (*(++argrest) == 'f') f.background_daemon = FALSE;
1967 else if (*argrest != 0) { badarg = TRUE; break; }
1970 /* -be: Run in expansion test mode
1971 -bem: Ditto, but read a message from a file first
1974 else if (*argrest == 'e')
1976 expansion_test = checking = TRUE;
1977 if (argrest[1] == 'm')
1979 if (++i >= argc) { badarg = TRUE; break; }
1980 expansion_test_message = argv[i];
1983 if (argrest[1] != 0) { badarg = TRUE; break; }
1986 /* -bF: Run system filter test */
1988 else if (*argrest == 'F')
1990 filter_test |= checking = FTEST_SYSTEM;
1991 if (*(++argrest) != 0) { badarg = TRUE; break; }
1992 if (++i < argc) filter_test_sfile = argv[i]; else
1993 exim_fail("exim: file name expected after %s\n", argv[i-1]);
1996 /* -bf: Run user filter test
1997 -bfd: Set domain for filter testing
1998 -bfl: Set local part for filter testing
1999 -bfp: Set prefix for filter testing
2000 -bfs: Set suffix for filter testing
2003 else if (*argrest == 'f')
2005 if (*(++argrest) == 0)
2007 filter_test |= checking = FTEST_USER;
2008 if (++i < argc) filter_test_ufile = argv[i]; else
2009 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2014 exim_fail("exim: string expected after %s\n", arg);
2015 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2016 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2017 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2018 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2019 else { badarg = TRUE; break; }
2023 /* -bh: Host checking - an IP address must follow. */
2025 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2027 if (++i >= argc) { badarg = TRUE; break; }
2028 sender_host_address = argv[i];
2029 host_checking = checking = f.log_testing_mode = TRUE;
2030 f.host_checking_callout = argrest[1] == 'c';
2031 message_logs = FALSE;
2034 /* -bi: This option is used by sendmail to initialize *the* alias file,
2035 though it has the -oA option to specify a different file. Exim has no
2036 concept of *the* alias file, but since Sun's YP make script calls
2037 sendmail this way, some support must be provided. */
2039 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2041 /* -bI: provide information, of the type to follow after a colon.
2042 This is an Exim flag. */
2044 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2046 uschar *p = &argrest[2];
2047 info_flag = CMDINFO_HELP;
2050 if (strcmpic(p, CUS"sieve") == 0)
2052 info_flag = CMDINFO_SIEVE;
2055 else if (strcmpic(p, CUS"dscp") == 0)
2057 info_flag = CMDINFO_DSCP;
2060 else if (strcmpic(p, CUS"help") == 0)
2067 /* -bm: Accept and deliver message - the default option. Reinstate
2068 receiving_message, which got turned off for all -b options. */
2070 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2072 /* -bmalware: test the filename given for malware */
2074 else if (Ustrcmp(argrest, "malware") == 0)
2076 if (++i >= argc) { badarg = TRUE; break; }
2078 malware_test_file = argv[i];
2081 /* -bnq: For locally originating messages, do not qualify unqualified
2082 addresses. In the envelope, this causes errors; in header lines they
2085 else if (Ustrcmp(argrest, "nq") == 0)
2087 f.allow_unqualified_sender = FALSE;
2088 f.allow_unqualified_recipient = FALSE;
2091 /* -bpxx: List the contents of the mail queue, in various forms. If
2092 the option is -bpc, just a queue count is needed. Otherwise, if the
2093 first letter after p is r, then order is random. */
2095 else if (*argrest == 'p')
2097 if (*(++argrest) == 'c')
2100 if (*(++argrest) != 0) badarg = TRUE;
2104 if (*argrest == 'r')
2106 list_queue_option = 8;
2109 else list_queue_option = 0;
2113 /* -bp: List the contents of the mail queue, top-level only */
2115 if (*argrest == 0) {}
2117 /* -bpu: List the contents of the mail queue, top-level undelivered */
2119 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2121 /* -bpa: List the contents of the mail queue, including all delivered */
2123 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2125 /* Unknown after -bp[r] */
2135 /* -bP: List the configuration variables given as the address list.
2136 Force -v, so configuration errors get displayed. */
2138 else if (Ustrcmp(argrest, "P") == 0)
2140 /* -bP config: we need to setup here, because later,
2141 * when list_options is checked, the config is read already */
2142 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2145 readconf_save_config(version_string);
2149 list_options = TRUE;
2150 debug_selector |= D_v;
2151 debug_file = stderr;
2155 /* -brt: Test retry configuration lookup */
2157 else if (Ustrcmp(argrest, "rt") == 0)
2160 test_retry_arg = i + 1;
2164 /* -brw: Test rewrite configuration */
2166 else if (Ustrcmp(argrest, "rw") == 0)
2169 test_rewrite_arg = i + 1;
2173 /* -bS: Read SMTP commands on standard input, but produce no replies -
2174 all errors are reported by sending messages. */
2176 else if (Ustrcmp(argrest, "S") == 0)
2177 smtp_input = smtp_batched_input = receiving_message = TRUE;
2179 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2180 on standard output. */
2182 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2184 /* -bt: address testing mode */
2186 else if (Ustrcmp(argrest, "t") == 0)
2187 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2189 /* -bv: verify addresses */
2191 else if (Ustrcmp(argrest, "v") == 0)
2192 verify_address_mode = checking = f.log_testing_mode = TRUE;
2194 /* -bvs: verify sender addresses */
2196 else if (Ustrcmp(argrest, "vs") == 0)
2198 verify_address_mode = checking = f.log_testing_mode = TRUE;
2199 verify_as_sender = TRUE;
2202 /* -bV: Print version string and support details */
2204 else if (Ustrcmp(argrest, "V") == 0)
2206 printf("Exim version %s #%s built %s\n", version_string,
2207 version_cnumber, version_date);
2208 printf("%s\n", CS version_copyright);
2209 version_printed = TRUE;
2210 show_whats_supported(stdout);
2211 f.log_testing_mode = TRUE;
2214 /* -bw: inetd wait mode, accept a listening socket as stdin */
2216 else if (*argrest == 'w')
2218 f.inetd_wait_mode = TRUE;
2219 f.background_daemon = FALSE;
2220 f.daemon_listen = TRUE;
2221 if (*(++argrest) != '\0')
2222 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2223 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2230 /* -C: change configuration file list; ignore if it isn't really
2231 a change! Enforce a prefix check if required. */
2236 if(++i < argc) argrest = argv[i]; else
2237 { badarg = TRUE; break; }
2239 if (Ustrcmp(config_main_filelist, argrest) != 0)
2241 #ifdef ALT_CONFIG_PREFIX
2243 int len = Ustrlen(ALT_CONFIG_PREFIX);
2244 const uschar *list = argrest;
2246 while((filename = string_nextinlist(&list, &sep, big_buffer,
2247 big_buffer_size)) != NULL)
2249 if ((Ustrlen(filename) < len ||
2250 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2251 Ustrstr(filename, "/../") != NULL) &&
2252 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2253 exim_fail("-C Permission denied\n");
2256 if (real_uid != root_uid)
2258 #ifdef TRUSTED_CONFIG_LIST
2260 if (real_uid != exim_uid
2261 #ifdef CONFIGURE_OWNER
2262 && real_uid != config_uid
2265 f.trusted_config = FALSE;
2268 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2271 struct stat statbuf;
2273 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2274 (statbuf.st_uid != root_uid /* owner not root */
2275 #ifdef CONFIGURE_OWNER
2276 && statbuf.st_uid != config_uid /* owner not the special one */
2279 (statbuf.st_gid != root_gid /* group not root */
2280 #ifdef CONFIGURE_GROUP
2281 && statbuf.st_gid != config_gid /* group not the special one */
2283 && (statbuf.st_mode & 020) != 0 /* group writeable */
2285 (statbuf.st_mode & 2) != 0) /* world writeable */
2287 f.trusted_config = FALSE;
2292 /* Well, the trust list at least is up to scratch... */
2293 void *reset_point = store_get(0);
2294 uschar *trusted_configs[32];
2298 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2300 uschar *start = big_buffer, *nl;
2301 while (*start && isspace(*start))
2305 nl = Ustrchr(start, '\n');
2308 trusted_configs[nr_configs++] = string_copy(start);
2309 if (nr_configs == 32)
2317 const uschar *list = argrest;
2319 while (f.trusted_config && (filename = string_nextinlist(&list,
2320 &sep, big_buffer, big_buffer_size)) != NULL)
2322 for (i=0; i < nr_configs; i++)
2324 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2327 if (i == nr_configs)
2329 f.trusted_config = FALSE;
2333 store_reset(reset_point);
2337 /* No valid prefixes found in trust_list file. */
2338 f.trusted_config = FALSE;
2344 /* Could not open trust_list file. */
2345 f.trusted_config = FALSE;
2349 /* Not root; don't trust config */
2350 f.trusted_config = FALSE;
2354 config_main_filelist = argrest;
2355 f.config_changed = TRUE;
2360 /* -D: set up a macro definition */
2363 #ifdef DISABLE_D_OPTION
2364 exim_fail("exim: -D is not available in this Exim binary\n");
2370 uschar *s = argrest;
2373 while (isspace(*s)) s++;
2375 if (*s < 'A' || *s > 'Z')
2376 exim_fail("exim: macro name set by -D must start with "
2377 "an upper case letter\n");
2379 while (isalnum(*s) || *s == '_')
2381 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2385 if (ptr == 0) { badarg = TRUE; break; }
2386 while (isspace(*s)) s++;
2389 if (*s++ != '=') { badarg = TRUE; break; }
2390 while (isspace(*s)) s++;
2393 for (m = macros_user; m; m = m->next)
2394 if (Ustrcmp(m->name, name) == 0)
2395 exim_fail("exim: duplicated -D in command line\n");
2397 m = macro_create(name, s, TRUE);
2399 if (clmacro_count >= MAX_CLMACROS)
2400 exim_fail("exim: too many -D options on command line\n");
2401 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2407 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2408 The latter is now a no-op, retained for compatibility only. If -dd is used,
2409 debugging subprocesses of the daemon is disabled. */
2412 if (Ustrcmp(argrest, "ropcr") == 0)
2414 /* drop_cr = TRUE; */
2417 /* Use an intermediate variable so that we don't set debugging while
2418 decoding the debugging bits. */
2422 unsigned int selector = D_default;
2425 if (*argrest == 'd')
2427 f.debug_daemon = TRUE;
2431 decode_bits(&selector, 1, debug_notall, argrest,
2432 debug_options, debug_options_count, US"debug", 0);
2433 debug_selector = selector;
2438 /* -E: This is a local error message. This option is not intended for
2439 external use at all, but is not restricted to trusted callers because it
2440 does no harm (just suppresses certain error messages) and if Exim is run
2441 not setuid root it won't always be trusted when it generates error
2442 messages using this option. If there is a message id following -E, point
2443 message_reference at it, for logging. */
2446 f.local_error_message = TRUE;
2447 if (mac_ismsgid(argrest)) message_reference = argrest;
2451 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2452 option, so it looks as if historically the -oex options are also callable
2453 without the leading -o. So we have to accept them. Before the switch,
2454 anything starting -oe has been converted to -e. Exim does not support all
2455 of the sendmail error options. */
2458 if (Ustrcmp(argrest, "e") == 0)
2460 arg_error_handling = ERRORS_SENDER;
2461 errors_sender_rc = EXIT_SUCCESS;
2463 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2464 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2465 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2466 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2471 /* -F: Set sender's full name, used instead of the gecos entry from
2472 the password file. Since users can usually alter their gecos entries,
2473 there's no security involved in using this instead. The data can follow
2474 the -F or be in the next argument. */
2479 if(++i < argc) argrest = argv[i]; else
2480 { badarg = TRUE; break; }
2482 originator_name = argrest;
2483 f.sender_name_forced = TRUE;
2487 /* -f: Set sender's address - this value is only actually used if Exim is
2488 run by a trusted user, or if untrusted_set_sender is set and matches the
2489 address, except that the null address can always be set by any user. The
2490 test for this happens later, when the value given here is ignored when not
2491 permitted. For an untrusted user, the actual sender is still put in Sender:
2492 if it doesn't match the From: header (unless no_local_from_check is set).
2493 The data can follow the -f or be in the next argument. The -r switch is an
2494 obsolete form of -f but since there appear to be programs out there that
2495 use anything that sendmail has ever supported, better accept it - the
2496 synonymizing is done before the switch above.
2498 At this stage, we must allow domain literal addresses, because we don't
2499 know what the setting of allow_domain_literals is yet. Ditto for trailing
2500 dots and strip_trailing_dot. */
2504 int dummy_start, dummy_end;
2508 if (i+1 < argc) argrest = argv[++i]; else
2509 { badarg = TRUE; break; }
2512 sender_address = string_sprintf(""); /* Ensure writeable memory */
2515 uschar *temp = argrest + Ustrlen(argrest) - 1;
2516 while (temp >= argrest && isspace(*temp)) temp--;
2517 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2518 allow_domain_literals = TRUE;
2519 strip_trailing_dot = TRUE;
2521 allow_utf8_domains = TRUE;
2523 sender_address = parse_extract_address(argrest, &errmess,
2524 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2526 message_smtputf8 = string_is_utf8(sender_address);
2527 allow_utf8_domains = FALSE;
2529 allow_domain_literals = FALSE;
2530 strip_trailing_dot = FALSE;
2531 if (!sender_address)
2532 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2534 f.sender_address_forced = TRUE;
2538 /* -G: sendmail invocation to specify that it's a gateway submission and
2539 sendmail may complain about problems instead of fixing them.
2540 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2541 not at this time complain about problems. */
2547 /* -h: Set the hop count for an incoming message. Exim does not currently
2548 support this; it always computes it by counting the Received: headers.
2549 To put it in will require a change to the spool header file format. */
2554 if(++i < argc) argrest = argv[i]; else
2555 { badarg = TRUE; break; }
2557 if (!isdigit(*argrest)) badarg = TRUE;
2561 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2562 not to be documented for sendmail but mailx (at least) uses it) */
2565 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2569 /* -L: set the identifier used for syslog; equivalent to setting
2570 syslog_processname in the config file, but needs to be an admin option. */
2573 if (*argrest == '\0')
2575 if(++i < argc) argrest = argv[i]; else
2576 { badarg = TRUE; break; }
2578 if ((sz = Ustrlen(argrest)) > 32)
2579 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2581 exim_fail("exim: the -L syslog name is too short\n");
2582 cmdline_syslog_name = argrest;
2586 receiving_message = FALSE;
2588 /* -MC: continue delivery of another message via an existing open
2589 file descriptor. This option is used for an internal call by the
2590 smtp transport when there is a pending message waiting to go to an
2591 address to which it has got a connection. Five subsequent arguments are
2592 required: transport name, host name, IP address, sequence number, and
2593 message_id. Transports may decline to create new processes if the sequence
2594 number gets too big. The channel is stdin. This (-MC) must be the last
2595 argument. There's a subsequent check that the real-uid is privileged.
2597 If we are running in the test harness. delay for a bit, to let the process
2598 that set this one up complete. This makes for repeatability of the logging,
2601 if (Ustrcmp(argrest, "C") == 0)
2603 union sockaddr_46 interface_sock;
2604 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2607 exim_fail("exim: too many or too few arguments after -MC\n");
2609 if (msg_action_arg >= 0)
2610 exim_fail("exim: incompatible arguments\n");
2612 continue_transport = argv[++i];
2613 continue_hostname = argv[++i];
2614 continue_host_address = argv[++i];
2615 continue_sequence = Uatoi(argv[++i]);
2616 msg_action = MSG_DELIVER;
2617 msg_action_arg = ++i;
2618 forced_delivery = TRUE;
2619 queue_run_pid = passed_qr_pid;
2620 queue_run_pipe = passed_qr_pipe;
2622 if (!mac_ismsgid(argv[i]))
2623 exim_fail("exim: malformed message id %s after -MC option\n",
2626 /* Set up $sending_ip_address and $sending_port, unless proxied */
2628 if (!continue_proxy_cipher)
2629 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2631 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2634 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2637 if (f.running_in_test_harness) millisleep(500);
2641 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2645 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2646 precedes -MC (see above). The flag indicates that the host to which
2647 Exim is connected has accepted an AUTH sequence. */
2649 case 'A': f.smtp_authenticated = TRUE; break;
2651 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2652 that exim is connected to supports the esmtp extension DSN */
2654 case 'D': smtp_peer_options |= OPTION_DSN; break;
2656 /* -MCG: set the queue name, to a non-default value */
2658 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2662 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2664 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2666 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2667 it preceded -MC (see above) */
2669 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2671 /* -MCQ: pass on the pid of the queue-running process that started
2672 this chain of deliveries and the fd of its synchronizing pipe; this
2673 is useful only when it precedes -MC (see above) */
2675 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2677 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2681 /* -MCS: set the smtp_use_size flag; this is useful only when it
2682 precedes -MC (see above) */
2684 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2687 /* -MCt: similar to -MCT below but the connection is still open
2688 via a proxy proces which handles the TLS context and coding.
2689 Require three arguments for the proxied local address and port,
2690 and the TLS cipher. */
2692 case 't': if (++i < argc) sending_ip_address = argv[i];
2694 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2696 if (++i < argc) continue_proxy_cipher = argv[i];
2700 /* -MCT: set the tls_offered flag; this is useful only when it
2701 precedes -MC (see above). The flag indicates that the host to which
2702 Exim is connected has offered TLS support. */
2704 case 'T': smtp_peer_options |= OPTION_TLS; break;
2707 default: badarg = TRUE; break;
2712 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2713 /* -MS set REQUIRETLS on (new) message */
2715 else if (*argrest == 'S')
2717 tls_requiretls |= REQUIRETLS_MSG;
2722 /* -M[x]: various operations on the following list of message ids:
2723 -M deliver the messages, ignoring next retry times and thawing
2724 -Mc deliver the messages, checking next retry times, no thawing
2725 -Mf freeze the messages
2726 -Mg give up on the messages
2727 -Mt thaw the messages
2728 -Mrm remove the messages
2729 In the above cases, this must be the last option. There are also the
2730 following options which are followed by a single message id, and which
2731 act on that message. Some of them use the "recipient" addresses as well.
2732 -Mar add recipient(s)
2733 -Mmad mark all recipients delivered
2734 -Mmd mark recipients(s) delivered
2736 -Mset load a message for use with -be
2738 -Mvc show copy (of whole message, in RFC 2822 format)
2743 else if (*argrest == 0)
2745 msg_action = MSG_DELIVER;
2746 forced_delivery = f.deliver_force_thaw = TRUE;
2748 else if (Ustrcmp(argrest, "ar") == 0)
2750 msg_action = MSG_ADD_RECIPIENT;
2751 one_msg_action = TRUE;
2753 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2754 else if (Ustrcmp(argrest, "es") == 0)
2756 msg_action = MSG_EDIT_SENDER;
2757 one_msg_action = TRUE;
2759 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2760 else if (Ustrcmp(argrest, "g") == 0)
2762 msg_action = MSG_DELIVER;
2763 deliver_give_up = TRUE;
2765 else if (Ustrcmp(argrest, "mad") == 0)
2767 msg_action = MSG_MARK_ALL_DELIVERED;
2769 else if (Ustrcmp(argrest, "md") == 0)
2771 msg_action = MSG_MARK_DELIVERED;
2772 one_msg_action = TRUE;
2774 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2775 else if (Ustrcmp(argrest, "set") == 0)
2777 msg_action = MSG_LOAD;
2778 one_msg_action = TRUE;
2780 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2781 else if (Ustrcmp(argrest, "vb") == 0)
2783 msg_action = MSG_SHOW_BODY;
2784 one_msg_action = TRUE;
2786 else if (Ustrcmp(argrest, "vc") == 0)
2788 msg_action = MSG_SHOW_COPY;
2789 one_msg_action = TRUE;
2791 else if (Ustrcmp(argrest, "vh") == 0)
2793 msg_action = MSG_SHOW_HEADER;
2794 one_msg_action = TRUE;
2796 else if (Ustrcmp(argrest, "vl") == 0)
2798 msg_action = MSG_SHOW_LOG;
2799 one_msg_action = TRUE;
2801 else { badarg = TRUE; break; }
2803 /* All the -Mxx options require at least one message id. */
2805 msg_action_arg = i + 1;
2806 if (msg_action_arg >= argc)
2807 exim_fail("exim: no message ids given after %s option\n", arg);
2809 /* Some require only message ids to follow */
2811 if (!one_msg_action)
2814 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2815 exim_fail("exim: malformed message id %s after %s option\n",
2817 goto END_ARG; /* Remaining args are ids */
2820 /* Others require only one message id, possibly followed by addresses,
2821 which will be handled as normal arguments. */
2825 if (!mac_ismsgid(argv[msg_action_arg]))
2826 exim_fail("exim: malformed message id %s after %s option\n",
2827 argv[msg_action_arg], arg);
2833 /* Some programs seem to call the -om option without the leading o;
2834 for sendmail it askes for "me too". Exim always does this. */
2837 if (*argrest != 0) badarg = TRUE;
2841 /* -N: don't do delivery - a debugging option that stops transports doing
2842 their thing. It implies debugging at the D_v level. */
2847 f.dont_deliver = TRUE;
2848 debug_selector |= D_v;
2849 debug_file = stderr;
2855 /* -n: This means "don't alias" in sendmail, apparently.
2856 For normal invocations, it has no effect.
2857 It may affect some other options. */
2863 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2864 option to the specified value. This form uses long names. We need to handle
2865 -O option=value and -Ooption=value. */
2871 exim_fail("exim: string expected after -O\n");
2877 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2880 if (*argrest == 'A')
2882 alias_arg = argrest + 1;
2883 if (alias_arg[0] == 0)
2885 if (i+1 < argc) alias_arg = argv[++i]; else
2886 exim_fail("exim: string expected after -oA\n");
2890 /* -oB: Set a connection message max value for remote deliveries */
2892 else if (*argrest == 'B')
2894 uschar *p = argrest + 1;
2897 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2899 connection_max_messages = 1;
2907 exim_fail("exim: number expected after -oB\n");
2908 connection_max_messages = Uatoi(p);
2912 /* -odb: background delivery */
2914 else if (Ustrcmp(argrest, "db") == 0)
2916 f.synchronous_delivery = FALSE;
2917 arg_queue_only = FALSE;
2918 queue_only_set = TRUE;
2921 /* -odf: foreground delivery (smail-compatible option); same effect as
2922 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2925 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2927 f.synchronous_delivery = TRUE;
2928 arg_queue_only = FALSE;
2929 queue_only_set = TRUE;
2932 /* -odq: queue only */
2934 else if (Ustrcmp(argrest, "dq") == 0)
2936 f.synchronous_delivery = FALSE;
2937 arg_queue_only = TRUE;
2938 queue_only_set = TRUE;
2941 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2942 but no remote delivery */
2944 else if (Ustrcmp(argrest, "dqs") == 0)
2946 f.queue_smtp = TRUE;
2947 arg_queue_only = FALSE;
2948 queue_only_set = TRUE;
2951 /* -oex: Sendmail error flags. As these are also accepted without the
2952 leading -o prefix, for compatibility with vacation and other callers,
2953 they are handled with -e above. */
2955 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2956 -oitrue: Another sendmail syntax for the same */
2958 else if (Ustrcmp(argrest, "i") == 0 ||
2959 Ustrcmp(argrest, "itrue") == 0)
2962 /* -oM*: Set various characteristics for an incoming message; actually
2963 acted on for trusted callers only. */
2965 else if (*argrest == 'M')
2968 exim_fail("exim: data expected after -o%s\n", argrest);
2970 /* -oMa: Set sender host address */
2972 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2974 /* -oMaa: Set authenticator name */
2976 else if (Ustrcmp(argrest, "Maa") == 0)
2977 sender_host_authenticated = argv[++i];
2979 /* -oMas: setting authenticated sender */
2981 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2983 /* -oMai: setting authenticated id */
2985 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2987 /* -oMi: Set incoming interface address */
2989 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2991 /* -oMm: Message reference */
2993 else if (Ustrcmp(argrest, "Mm") == 0)
2995 if (!mac_ismsgid(argv[i+1]))
2996 exim_fail("-oMm must be a valid message ID\n");
2997 if (!f.trusted_config)
2998 exim_fail("-oMm must be called by a trusted user/config\n");
2999 message_reference = argv[++i];
3002 /* -oMr: Received protocol */
3004 else if (Ustrcmp(argrest, "Mr") == 0)
3006 if (received_protocol)
3007 exim_fail("received_protocol is set already\n");
3009 received_protocol = argv[++i];
3011 /* -oMs: Set sender host name */
3013 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3015 /* -oMt: Set sender ident */
3017 else if (Ustrcmp(argrest, "Mt") == 0)
3019 sender_ident_set = TRUE;
3020 sender_ident = argv[++i];
3023 /* Else a bad argument */
3032 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3033 seem to call this as -m (undocumented), so that is also accepted (see
3036 else if (Ustrcmp(argrest, "m") == 0) {}
3038 /* -oo: An ancient flag for old-style addresses which still seems to
3039 crop up in some calls (see in SCO). */
3041 else if (Ustrcmp(argrest, "o") == 0) {}
3043 /* -oP <name>: set pid file path for daemon */
3045 else if (Ustrcmp(argrest, "P") == 0)
3046 override_pid_file_path = argv[++i];
3048 /* -or <n>: set timeout for non-SMTP acceptance
3049 -os <n>: set timeout for SMTP acceptance */
3051 else if (*argrest == 'r' || *argrest == 's')
3053 int *tp = (*argrest == 'r')?
3054 &arg_receive_timeout : &arg_smtp_receive_timeout;
3055 if (argrest[1] == 0)
3057 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3059 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3061 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3064 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3066 else if (Ustrcmp(argrest, "X") == 0)
3067 override_local_interfaces = argv[++i];
3069 /* Unknown -o argument */
3075 /* -ps: force Perl startup; -pd force delayed Perl startup */
3079 if (*argrest == 's' && argrest[1] == 0)
3081 perl_start_option = 1;
3084 if (*argrest == 'd' && argrest[1] == 0)
3086 perl_start_option = -1;
3091 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3092 which sets the host protocol and host name */
3096 argrest = argv[++i];
3098 { badarg = TRUE; break; }
3104 if (received_protocol)
3105 exim_fail("received_protocol is set already\n");
3107 hn = Ustrchr(argrest, ':');
3109 received_protocol = argrest;
3112 int old_pool = store_pool;
3113 store_pool = POOL_PERM;
3114 received_protocol = string_copyn(argrest, hn - argrest);
3115 store_pool = old_pool;
3116 sender_host_name = hn + 1;
3123 receiving_message = FALSE;
3124 if (queue_interval >= 0)
3125 exim_fail("exim: -q specified more than once\n");
3127 /* -qq...: Do queue runs in a 2-stage manner */
3129 if (*argrest == 'q')
3131 f.queue_2stage = TRUE;
3135 /* -qi...: Do only first (initial) deliveries */
3137 if (*argrest == 'i')
3139 f.queue_run_first_delivery = TRUE;
3143 /* -qf...: Run the queue, forcing deliveries
3144 -qff..: Ditto, forcing thawing as well */
3146 if (*argrest == 'f')
3148 f.queue_run_force = TRUE;
3149 if (*++argrest == 'f')
3151 f.deliver_force_thaw = TRUE;
3156 /* -q[f][f]l...: Run the queue only on local deliveries */
3158 if (*argrest == 'l')
3160 f.queue_run_local = TRUE;
3164 /* -q[f][f][l][G<name>]... Work on the named queue */
3166 if (*argrest == 'G')
3169 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3170 queue_name = string_copyn(argrest, i);
3172 if (*argrest == '/') argrest++;
3175 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3176 only, optionally named, optionally starting from a given message id. */
3178 if (*argrest == 0 &&
3179 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3182 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3183 start_queue_run_id = argv[++i];
3184 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3185 stop_queue_run_id = argv[++i];
3188 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3189 forced, optionally local only, optionally named. */
3191 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3193 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3197 case 'R': /* Synonymous with -qR... */
3198 receiving_message = FALSE;
3200 /* -Rf: As -R (below) but force all deliveries,
3201 -Rff: Ditto, but also thaw all frozen messages,
3202 -Rr: String is regex
3203 -Rrf: Regex and force
3204 -Rrff: Regex and force and thaw
3206 in all cases provided there are no further characters in this
3212 for (i = 0; i < nelem(rsopts); i++)
3213 if (Ustrcmp(argrest, rsopts[i]) == 0)
3215 if (i != 2) f.queue_run_force = TRUE;
3216 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3217 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3218 argrest += Ustrlen(rsopts[i]);
3222 /* -R: Set string to match in addresses for forced queue run to
3223 pick out particular messages. */
3226 deliver_selectstring = argrest;
3227 else if (i+1 < argc)
3228 deliver_selectstring = argv[++i];
3230 exim_fail("exim: string expected after -R\n");
3234 /* -r: an obsolete synonym for -f (see above) */
3237 /* -S: Like -R but works on sender. */
3239 case 'S': /* Synonymous with -qS... */
3240 receiving_message = FALSE;
3242 /* -Sf: As -S (below) but force all deliveries,
3243 -Sff: Ditto, but also thaw all frozen messages,
3244 -Sr: String is regex
3245 -Srf: Regex and force
3246 -Srff: Regex and force and thaw
3248 in all cases provided there are no further characters in this
3254 for (i = 0; i < nelem(rsopts); i++)
3255 if (Ustrcmp(argrest, rsopts[i]) == 0)
3257 if (i != 2) f.queue_run_force = TRUE;
3258 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3259 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3260 argrest += Ustrlen(rsopts[i]);
3264 /* -S: Set string to match in addresses for forced queue run to
3265 pick out particular messages. */
3268 deliver_selectstring_sender = argrest;
3269 else if (i+1 < argc)
3270 deliver_selectstring_sender = argv[++i];
3272 exim_fail("exim: string expected after -S\n");
3275 /* -Tqt is an option that is exclusively for use by the testing suite.
3276 It is not recognized in other circumstances. It allows for the setting up
3277 of explicit "queue times" so that various warning/retry things can be
3278 tested. Otherwise variability of clock ticks etc. cause problems. */
3281 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3282 fudged_queue_times = argv[++i];
3287 /* -t: Set flag to extract recipients from body of message. */
3290 if (*argrest == 0) extract_recipients = TRUE;
3292 /* -ti: Set flag to extract recipients from body of message, and also
3293 specify that dot does not end the message. */
3295 else if (Ustrcmp(argrest, "i") == 0)
3297 extract_recipients = TRUE;
3301 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3304 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3311 /* -U: This means "initial user submission" in sendmail, apparently. The
3312 doc claims that in future sendmail may refuse syntactically invalid
3313 messages instead of fixing them. For the moment, we just ignore it. */
3319 /* -v: verify things - this is a very low-level debugging */
3324 debug_selector |= D_v;
3325 debug_file = stderr;
3331 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3333 The -x flag tells the sendmail command that mail from a local
3334 mail program has National Language Support (NLS) extended characters
3335 in the body of the mail item. The sendmail command can send mail with
3336 extended NLS characters across networks that normally corrupts these
3339 As Exim is 8-bit clean, it just ignores this flag. */
3342 if (*argrest != 0) badarg = TRUE;
3345 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3346 logs to that file. We swallow the parameter and otherwise ignore it. */
3349 if (*argrest == '\0')
3351 exim_fail("exim: string expected after -X\n");
3355 if (*argrest == '\0')
3357 log_oneline = argv[i];
3359 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3362 /* All other initial characters are errors */
3367 } /* End of high-level switch statement */
3369 /* Failed to recognize the option, or syntax error */
3372 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3373 "option %s\n", arg);
3377 /* If -R or -S have been specified without -q, assume a single queue run. */
3379 if ( (deliver_selectstring || deliver_selectstring_sender)
3380 && queue_interval < 0)
3385 /* If usage_wanted is set we call the usage function - which never returns */
3386 if (usage_wanted) exim_usage(called_as);
3388 /* Arguments have been processed. Check for incompatibilities. */
3390 (smtp_input || extract_recipients || recipients_arg < argc) &&
3391 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3392 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3393 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3396 msg_action_arg > 0 &&
3397 (f.daemon_listen || queue_interval > 0 || list_options ||
3398 (checking && msg_action != MSG_LOAD) ||
3399 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3402 (f.daemon_listen || queue_interval > 0) &&
3403 (sender_address != NULL || list_options || list_queue || checking ||
3407 f.daemon_listen && queue_interval == 0
3410 f.inetd_wait_mode && queue_interval >= 0
3414 (checking || smtp_input || extract_recipients ||
3415 filter_test != FTEST_NONE || bi_option)
3418 verify_address_mode &&
3419 (f.address_test_mode || smtp_input || extract_recipients ||
3420 filter_test != FTEST_NONE || bi_option)
3423 f.address_test_mode && (smtp_input || extract_recipients ||
3424 filter_test != FTEST_NONE || bi_option)
3427 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3431 deliver_selectstring != NULL && queue_interval < 0
3434 msg_action == MSG_LOAD &&
3435 (!expansion_test || expansion_test_message != NULL)
3438 exim_fail("exim: incompatible command-line options or arguments\n");
3440 /* If debugging is set up, set the file and the file descriptor to pass on to
3441 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3442 to run in the foreground. */
3444 if (debug_selector != 0)
3446 debug_file = stderr;
3447 debug_fd = fileno(debug_file);
3448 f.background_daemon = FALSE;
3449 if (f.running_in_test_harness) millisleep(100); /* lets caller finish */
3450 if (debug_selector != D_v) /* -v only doesn't show this */
3452 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3453 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3455 if (!version_printed)
3456 show_whats_supported(stderr);
3460 /* When started with root privilege, ensure that the limits on the number of
3461 open files and the number of processes (where that is accessible) are
3462 sufficiently large, or are unset, in case Exim has been called from an
3463 environment where the limits are screwed down. Not all OS have the ability to
3464 change some of these limits. */
3468 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3474 #ifdef RLIMIT_NOFILE
3475 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3477 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3479 rlp.rlim_cur = rlp.rlim_max = 0;
3482 /* I originally chose 1000 as a nice big number that was unlikely to
3483 be exceeded. It turns out that some older OS have a fixed upper limit of
3486 if (rlp.rlim_cur < 1000)
3488 rlp.rlim_cur = rlp.rlim_max = 1000;
3489 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3491 rlp.rlim_cur = rlp.rlim_max = 256;
3492 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3493 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3500 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3502 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3504 rlp.rlim_cur = rlp.rlim_max = 0;
3507 #ifdef RLIM_INFINITY
3508 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3510 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3512 if (rlp.rlim_cur < 1000)
3514 rlp.rlim_cur = rlp.rlim_max = 1000;
3516 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3517 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3523 /* Exim is normally entered as root (but some special configurations are
3524 possible that don't do this). However, it always spins off sub-processes that
3525 set their uid and gid as required for local delivery. We don't want to pass on
3526 any extra groups that root may belong to, so we want to get rid of them all at
3529 We need to obey setgroups() at this stage, before possibly giving up root
3530 privilege for a changed configuration file, but later on we might need to
3531 check on the additional groups for the admin user privilege - can't do that
3532 till after reading the config, which might specify the exim gid. Therefore,
3533 save the group list here first. */
3535 if ((group_count = getgroups(NGROUPS_MAX, group_list)) < 0)
3536 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3538 /* There is a fundamental difference in some BSD systems in the matter of
3539 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3540 known not to be different. On the "different" systems there is a single group
3541 list, and the first entry in it is the current group. On all other versions of
3542 Unix there is a supplementary group list, which is in *addition* to the current
3543 group. Consequently, to get rid of all extraneous groups on a "standard" system
3544 you pass over 0 groups to setgroups(), while on a "different" system you pass
3545 over a single group - the current group, which is always the first group in the
3546 list. Calling setgroups() with zero groups on a "different" system results in
3547 an error return. The following code should cope with both types of system.
3549 However, if this process isn't running as root, setgroups() can't be used
3550 since you have to be root to run it, even if throwing away groups. Not being
3551 root here happens only in some unusual configurations. We just ignore the
3554 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0 && !unprivileged)
3555 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3557 /* If the configuration file name has been altered by an argument on the
3558 command line (either a new file name or a macro definition) and the caller is
3559 not root, or if this is a filter testing run, remove any setuid privilege the
3560 program has and run as the underlying user.
3562 The exim user is locked out of this, which severely restricts the use of -C
3565 Otherwise, set the real ids to the effective values (should be root unless run
3566 from inetd, which it can either be root or the exim uid, if one is configured).
3568 There is a private mechanism for bypassing some of this, in order to make it
3569 possible to test lots of configurations automatically, without having either to
3570 recompile each time, or to patch in an actual configuration file name and other
3571 values (such as the path name). If running in the test harness, pretend that
3572 configuration file changes and macro definitions haven't happened. */
3575 (!f.trusted_config || /* Config changed, or */
3576 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3577 real_uid != root_uid && /* Not root, and */
3578 !f.running_in_test_harness /* Not fudged */
3580 expansion_test /* expansion testing */
3582 filter_test != FTEST_NONE) /* Filter testing */
3584 setgroups(group_count, group_list);
3585 exim_setugid(real_uid, real_gid, FALSE,
3586 US"-C, -D, -be or -bf forces real uid");
3587 removed_privilege = TRUE;
3589 /* In the normal case when Exim is called like this, stderr is available
3590 and should be used for any logging information because attempts to write
3591 to the log will usually fail. To arrange this, we unset really_exim. However,
3592 if no stderr is available there is no point - we might as well have a go
3593 at the log (if it fails, syslog will be written).
3595 Note that if the invoker is Exim, the logs remain available. Messing with
3596 this causes unlogged successful deliveries. */
3598 if (log_stderr && real_uid != exim_uid)
3599 f.really_exim = FALSE;
3602 /* Privilege is to be retained for the moment. It may be dropped later,
3603 depending on the job that this Exim process has been asked to do. For now, set
3604 the real uid to the effective so that subsequent re-execs of Exim are done by a
3608 exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3610 /* If testing a filter, open the file(s) now, before wasting time doing other
3611 setups and reading the message. */
3613 if (filter_test & FTEST_SYSTEM)
3614 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3615 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3618 if (filter_test & FTEST_USER)
3619 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3620 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3623 /* Initialise lookup_list
3624 If debugging, already called above via version reporting.
3625 In either case, we initialise the list of available lookups while running
3626 as root. All dynamically modules are loaded from a directory which is
3627 hard-coded into the binary and is code which, if not a module, would be
3628 part of Exim already. Ability to modify the content of the directory
3629 is equivalent to the ability to modify a setuid binary!
3631 This needs to happen before we read the main configuration. */
3635 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3638 /* Read the main runtime configuration data; this gives up if there
3639 is a failure. It leaves the configuration file open so that the subsequent
3640 configuration data for delivery can be read if needed.
3642 NOTE: immediatly after opening the configuration file we change the working
3643 directory to "/"! Later we change to $spool_directory. We do it there, because
3644 during readconf_main() some expansion takes place already. */
3646 /* Store the initial cwd before we change directories. Can be NULL if the
3647 dir has already been unlinked. */
3648 initial_cwd = os_getcwd(NULL, 0);
3651 -be[m] expansion test -
3652 -b[fF] filter test new
3654 -bmalware malware_test_file new
3656 -brw rewrite test new
3658 -bv[s] address verify -
3660 -bP <option> (except -bP config, which sets list_config)
3662 If any of these options is set, we suppress warnings about configuration
3663 issues (currently about tls_advertise_hosts and keep_environment not being
3666 readconf_main(checking || list_options);
3669 /* Now in directory "/" */
3671 if (cleanup_environment() == FALSE)
3672 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3675 /* If an action on specific messages is requested, or if a daemon or queue
3676 runner is being started, we need to know if Exim was called by an admin user.
3677 This is the case if the real user is root or exim, or if the real group is
3678 exim, or if one of the supplementary groups is exim or a group listed in
3679 admin_groups. We don't fail all message actions immediately if not admin_user,
3680 since some actions can be performed by non-admin users. Instead, set admin_user
3681 for later interrogation. */
3683 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3684 f.admin_user = TRUE;
3688 for (i = 0; i < group_count && !f.admin_user; i++)
3689 if (group_list[i] == exim_gid)
3690 f.admin_user = TRUE;
3691 else if (admin_groups)
3692 for (j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3693 if (admin_groups[j] == group_list[i])
3694 f.admin_user = TRUE;
3697 /* Another group of privileged users are the trusted users. These are root,
3698 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3699 are permitted to specify sender_addresses with -f on the command line, and
3700 other message parameters as well. */
3702 if (real_uid == root_uid || real_uid == exim_uid)
3703 f.trusted_caller = TRUE;
3709 for (i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3710 if (trusted_users[i] == real_uid)
3711 f.trusted_caller = TRUE;
3714 for (i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3715 if (trusted_groups[i] == real_gid)
3716 f.trusted_caller = TRUE;
3717 else for (j = 0; j < group_count && !f.trusted_caller; j++)
3718 if (trusted_groups[i] == group_list[j])
3719 f.trusted_caller = TRUE;
3722 /* At this point, we know if the user is privileged and some command-line
3723 options become possibly impermissible, depending upon the configuration file. */
3725 if (checking && commandline_checks_require_admin && !f.admin_user)
3726 exim_fail("exim: those command-line flags are set to require admin\n");
3728 /* Handle the decoding of logging options. */
3730 decode_bits(log_selector, log_selector_size, log_notall,
3731 log_selector_string, log_options, log_options_count, US"log", 0);
3736 debug_printf("configuration file is %s\n", config_main_filename);
3737 debug_printf("log selectors =");
3738 for (i = 0; i < log_selector_size; i++)
3739 debug_printf(" %08x", log_selector[i]);
3743 /* If domain literals are not allowed, check the sender address that was
3744 supplied with -f. Ditto for a stripped trailing dot. */
3748 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3749 exim_fail("exim: bad -f address \"%s\": domain literals not "
3750 "allowed\n", sender_address);
3751 if (f_end_dot && !strip_trailing_dot)
3752 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3753 "(trailing dot not allowed)\n", sender_address);
3756 /* See if an admin user overrode our logging. */
3758 if (cmdline_syslog_name)
3761 syslog_processname = cmdline_syslog_name;
3762 log_file_path = string_copy(CUS"syslog");
3765 /* not a panic, non-privileged users should not be able to spam paniclog */
3767 "exim: you lack sufficient privilege to specify syslog process name\n");
3769 /* Paranoia check of maximum lengths of certain strings. There is a check
3770 on the length of the log file path in log.c, which will come into effect
3771 if there are any calls to write the log earlier than this. However, if we
3772 get this far but the string is very long, it is better to stop now than to
3773 carry on and (e.g.) receive a message and then have to collapse. The call to
3774 log_write() from here will cause the ultimate panic collapse if the complete
3775 file name exceeds the buffer length. */
3777 if (Ustrlen(log_file_path) > 200)
3778 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3779 "log_file_path is longer than 200 chars: aborting");
3781 if (Ustrlen(pid_file_path) > 200)
3782 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3783 "pid_file_path is longer than 200 chars: aborting");
3785 if (Ustrlen(spool_directory) > 200)
3786 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3787 "spool_directory is longer than 200 chars: aborting");
3789 /* Length check on the process name given to syslog for its TAG field,
3790 which is only permitted to be 32 characters or less. See RFC 3164. */
3792 if (Ustrlen(syslog_processname) > 32)
3793 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3794 "syslog_processname is longer than 32 chars: aborting");
3799 log_write(0, LOG_MAIN, "%s", log_oneline);
3800 return EXIT_SUCCESS;
3803 return EXIT_FAILURE;
3805 /* In some operating systems, the environment variable TMPDIR controls where
3806 temporary files are created; Exim doesn't use these (apart from when delivering
3807 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3808 If TMPDIR is found in the environment, reset it to the value defined in the
3809 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3810 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3811 EXIM_TMPDIR by the build scripts.
3817 if (environ) for (p = USS environ; *p; p++)
3818 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3820 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3821 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3823 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3828 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3829 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3830 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3831 called by a user who has set the TZ variable. This then affects the timestamps
3832 in log files and in Received: headers, and any created Date: header lines. The
3833 required timezone is settable in the configuration file, so nothing can be done
3834 about this earlier - but hopefully nothing will normally be logged earlier than
3835 this. We have to make a new environment if TZ is wrong, but don't bother if
3836 timestamps_utc is set, because then all times are in UTC anyway. */
3838 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3839 f.timestamps_utc = TRUE;
3842 uschar *envtz = US getenv("TZ");
3844 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3845 : timezone_string != NULL
3848 uschar **p = USS environ;
3852 if (environ) while (*p++) count++;
3853 if (!envtz) count++;
3854 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3855 if (environ) for (p = USS environ; *p; p++)
3856 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3857 if (timezone_string)
3859 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3860 sprintf(CS *newp++, "TZ=%s", timezone_string);
3865 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3866 tod_stamp(tod_log));
3870 /* Handle the case when we have removed the setuid privilege because of -C or
3871 -D. This means that the caller of Exim was not root.
3873 There is a problem if we were running as the Exim user. The sysadmin may
3874 expect this case to retain privilege because "the binary was called by the
3875 Exim user", but it hasn't, because either the -D option set macros, or the
3876 -C option set a non-trusted configuration file. There are two possibilities:
3878 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3879 to do message deliveries. Thus, the fact that it is running as a
3880 non-privileged user is plausible, and might be wanted in some special
3881 configurations. However, really_exim will have been set false when
3882 privilege was dropped, to stop Exim trying to write to its normal log
3883 files. Therefore, re-enable normal log processing, assuming the sysadmin
3884 has set up the log directory correctly.
3886 (2) If deliver_drop_privilege is not set, the configuration won't work as
3887 apparently intended, and so we log a panic message. In order to retain
3888 root for -C or -D, the caller must either be root or be invoking a
3889 trusted configuration file (when deliver_drop_privilege is false). */
3891 if ( removed_privilege
3892 && (!f.trusted_config || opt_D_used)
3893 && real_uid == exim_uid)
3894 if (deliver_drop_privilege)
3895 f.really_exim = TRUE; /* let logging work normally */
3897 log_write(0, LOG_MAIN|LOG_PANIC,
3898 "exim user lost privilege for using %s option",
3899 f.trusted_config? "-D" : "-C");
3901 /* Start up Perl interpreter if Perl support is configured and there is a
3902 perl_startup option, and the configuration or the command line specifies
3903 initializing starting. Note that the global variables are actually called
3904 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3907 if (perl_start_option != 0)
3908 opt_perl_at_start = (perl_start_option > 0);
3909 if (opt_perl_at_start && opt_perl_startup != NULL)
3912 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3913 if ((errstr = init_perl(opt_perl_startup)))
3914 exim_fail("exim: error in perl_startup code: %s\n", errstr);
3915 opt_perl_started = TRUE;
3917 #endif /* EXIM_PERL */
3919 /* Log the arguments of the call if the configuration file said so. This is
3920 a debugging feature for finding out what arguments certain MUAs actually use.
3921 Don't attempt it if logging is disabled, or if listing variables or if
3922 verifying/testing addresses or expansions. */
3924 if ( (debug_selector & D_any || LOGGING(arguments))
3925 && f.really_exim && !list_options && !checking)
3928 uschar *p = big_buffer;
3929 Ustrcpy(p, "cwd= (failed)");
3935 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3936 p += 4 + Ustrlen(initial_cwd);
3937 /* in case p is near the end and we don't provide enough space for
3938 * string_format to be willing to write. */
3942 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3944 for (i = 0; i < argc; i++)
3946 int len = Ustrlen(argv[i]);
3947 const uschar *printing;
3949 if (p + len + 8 >= big_buffer + big_buffer_size)
3952 log_write(0, LOG_MAIN, "%s", big_buffer);
3953 Ustrcpy(big_buffer, "...");
3956 printing = string_printing(argv[i]);
3957 if (printing[0] == 0) quote = US"\""; else
3959 const uschar *pp = printing;
3961 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3963 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3964 (p - big_buffer) - 4), printing, quote);
3967 if (LOGGING(arguments))
3968 log_write(0, LOG_MAIN, "%s", big_buffer);
3970 debug_printf("%s\n", big_buffer);
3973 /* Set the working directory to be the top-level spool directory. We don't rely
3974 on this in the code, which always uses fully qualified names, but it's useful
3975 for core dumps etc. Don't complain if it fails - the spool directory might not
3976 be generally accessible and calls with the -C option (and others) have lost
3977 privilege by now. Before the chdir, we try to ensure that the directory exists.
3980 if (Uchdir(spool_directory) != 0)
3983 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3984 dummy = /* quieten compiler */ Uchdir(spool_directory);
3985 dummy = dummy; /* yet more compiler quietening, sigh */
3988 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3989 alias file. Exim doesn't have such a concept, but this call is screwed into
3990 Sun's YP makefiles. Handle this by calling a configured script, as the real
3991 user who called Exim. The -oA option can be used to pass an argument to the
3996 (void)fclose(config_file);
3997 if (bi_command != NULL)
4001 argv[i++] = bi_command;
4002 if (alias_arg != NULL) argv[i++] = alias_arg;
4005 setgroups(group_count, group_list);
4006 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4008 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4009 (argv[1] == NULL)? US"" : argv[1]);
4011 execv(CS argv[0], (char *const *)argv);
4012 exim_fail("exim: exec failed: %s\n", strerror(errno));
4016 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4021 /* We moved the admin/trusted check to be immediately after reading the
4022 configuration file. We leave these prints here to ensure that syslog setup,
4023 logfile setup, and so on has already happened. */
4025 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4026 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4028 /* Only an admin user may start the daemon or force a queue run in the default
4029 configuration, but the queue run restriction can be relaxed. Only an admin
4030 user may request that a message be returned to its sender forthwith. Only an
4031 admin user may specify a debug level greater than D_v (because it might show
4032 passwords, etc. in lookup queries). Only an admin user may request a queue
4033 count. Only an admin user can use the test interface to scan for email
4034 (because Exim will be in the spool dir and able to look at mails). */
4038 BOOL debugset = (debug_selector & ~D_v) != 0;
4039 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4040 (count_queue && queue_list_requires_admin) ||
4041 (list_queue && queue_list_requires_admin) ||
4042 (queue_interval >= 0 && prod_requires_admin) ||
4043 (debugset && !f.running_in_test_harness))
4044 exim_fail("exim:%s permission denied\n", debugset? " debugging" : "");
4047 /* If the real user is not root or the exim uid, the argument for passing
4048 in an open TCP/IP connection for another message is not permitted, nor is
4049 running with the -N option for any delivery action, unless this call to exim is
4050 one that supplied an input message, or we are using a patched exim for
4051 regression testing. */
4053 if (real_uid != root_uid && real_uid != exim_uid &&
4054 (continue_hostname != NULL ||
4056 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4057 )) && !f.running_in_test_harness)
4058 exim_fail("exim: Permission denied\n");
4060 /* If the caller is not trusted, certain arguments are ignored when running for
4061 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4062 Note that authority for performing certain actions on messages is tested in the
4063 queue_action() function. */
4065 if (!f.trusted_caller && !checking)
4067 sender_host_name = sender_host_address = interface_address =
4068 sender_ident = received_protocol = NULL;
4069 sender_host_port = interface_port = 0;
4070 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4073 /* If a sender host address is set, extract the optional port number off the
4074 end of it and check its syntax. Do the same thing for the interface address.
4075 Exim exits if the syntax is bad. */
4079 if (sender_host_address != NULL)
4080 sender_host_port = check_port(sender_host_address);
4081 if (interface_address != NULL)
4082 interface_port = check_port(interface_address);
4085 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4088 if (f.trusted_caller)
4090 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4091 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4094 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4097 /* If an SMTP message is being received check to see if the standard input is a
4098 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4099 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4104 union sockaddr_46 inetd_sock;
4105 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4106 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4108 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4109 if (family == AF_INET || family == AF_INET6)
4111 union sockaddr_46 interface_sock;
4112 size = sizeof(interface_sock);
4114 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4115 interface_address = host_ntoa(-1, &interface_sock, NULL,
4118 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4120 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4123 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4124 NULL, &sender_host_port);
4125 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4126 "inetd is not supported when mua_wrapper is set");
4130 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4135 /* If the load average is going to be needed while receiving a message, get it
4136 now for those OS that require the first call to os_getloadavg() to be done as
4137 root. There will be further calls later for each message received. */
4139 #ifdef LOAD_AVG_NEEDS_ROOT
4140 if (receiving_message &&
4141 (queue_only_load >= 0 ||
4142 (f.is_inetd && smtp_load_reserve >= 0)
4145 load_average = OS_GETLOADAVG();
4149 /* The queue_only configuration option can be overridden by -odx on the command
4150 line, except that if queue_only_override is false, queue_only cannot be unset
4151 from the command line. */
4153 if (queue_only_set && (queue_only_override || arg_queue_only))
4154 queue_only = arg_queue_only;
4156 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4159 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4160 if (arg_smtp_receive_timeout >= 0)
4161 smtp_receive_timeout = arg_smtp_receive_timeout;
4163 /* If Exim was started with root privilege, unless we have already removed the
4164 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4165 except when starting the daemon or doing some kind of delivery or address
4166 testing (-bt). These are the only cases when root need to be retained. We run
4167 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4168 retained only for starting the daemon. We always do the initgroups() in this
4169 situation (controlled by the TRUE below), in order to be as close as possible
4170 to the state Exim usually runs in. */
4172 if (!unprivileged && /* originally had root AND */
4173 !removed_privilege && /* still got root AND */
4174 !f.daemon_listen && /* not starting the daemon */
4175 queue_interval <= 0 && /* (either kind of daemon) */
4177 deliver_drop_privilege || /* requested unprivileged */
4179 queue_interval < 0 && /* not running the queue */
4180 (msg_action_arg < 0 || /* and */
4181 msg_action != MSG_DELIVER) && /* not delivering and */
4182 (!checking || !f.address_test_mode) /* not address checking */
4184 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4186 /* When we are retaining a privileged uid, we still change to the exim gid. */
4191 rv = setgid(exim_gid);
4192 /* Impact of failure is that some stuff might end up with an incorrect group.
4193 We track this for failures from root, since any attempt to change privilege
4194 by root should succeed and failures should be examined. For non-root,
4195 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4196 no need to complain then. */
4198 if (!(unprivileged || removed_privilege))
4199 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4201 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4202 (long int)exim_gid, strerror(errno));
4205 /* Handle a request to scan a file for malware */
4206 if (malware_test_file)
4208 #ifdef WITH_CONTENT_SCAN
4210 set_process_info("scanning file for malware");
4211 result = malware_in_file(malware_test_file);
4214 printf("No malware found.\n");
4219 printf("Malware lookup returned non-okay/fail: %d\n", result);
4223 printf("Malware found: %s\n", malware_name);
4225 printf("Malware scan detected malware of unknown name.\n");
4227 printf("Malware scanning not enabled at compile time.\n");
4232 /* Handle a request to list the delivery queue */
4236 set_process_info("listing the queue");
4237 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4241 /* Handle a request to count the delivery queue */
4245 set_process_info("counting the queue");
4250 /* Handle actions on specific messages, except for the force delivery and
4251 message load actions, which are done below. Some actions take a whole list of
4252 message ids, which are known to continue up to the end of the arguments. Others
4253 take a single message id and then operate on the recipients list. */
4255 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4257 int yield = EXIT_SUCCESS;
4258 set_process_info("acting on specified messages");
4260 /* ACL definitions may be needed when removing a message (-Mrm) because
4261 event_action gets expanded */
4263 if (msg_action == MSG_REMOVE)
4266 if (!one_msg_action)
4268 for (i = msg_action_arg; i < argc; i++)
4269 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4270 yield = EXIT_FAILURE;
4273 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4274 recipients_arg)) yield = EXIT_FAILURE;
4278 /* We used to set up here to skip reading the ACL section, on
4279 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4280 Now, since the intro of the ${acl } expansion, ACL definitions may be
4281 needed in transports so we lost the optimisation. */
4285 /* The configuration data will have been read into POOL_PERM because we won't
4286 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4287 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4288 configuration were read into POOL_MAIN, because we don't do any resets till
4289 later on. However, it seems right, and it does ensure that both pools get used.
4292 store_pool = POOL_MAIN;
4294 /* Handle the -brt option. This is for checking out retry configurations.
4295 The next three arguments are a domain name or a complete address, and
4296 optionally two error numbers. All it does is to call the function that
4297 scans the retry configuration data. */
4299 if (test_retry_arg >= 0)
4301 retry_config *yield;
4302 int basic_errno = 0;
4306 if (test_retry_arg >= argc)
4308 printf("-brt needs a domain or address argument\n");
4309 exim_exit(EXIT_FAILURE, US"main");
4311 s1 = argv[test_retry_arg++];
4314 /* If the first argument contains no @ and no . it might be a local user
4315 or it might be a single-component name. Treat as a domain. */
4317 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4319 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4320 "being \ntreated as a one-component domain, not as a local part.\n\n",
4324 /* There may be an optional second domain arg. */
4326 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4327 s2 = argv[test_retry_arg++];
4329 /* The final arg is an error name */
4331 if (test_retry_arg < argc)
4333 uschar *ss = argv[test_retry_arg];
4335 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4338 printf("%s\n", CS error);
4339 return EXIT_FAILURE;
4342 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4343 code > 100 as an error is for matching codes to the decade. Turn them into
4344 a real error code, off the decade. */
4346 if (basic_errno == ERRNO_MAIL4XX ||
4347 basic_errno == ERRNO_RCPT4XX ||
4348 basic_errno == ERRNO_DATA4XX)
4350 int code = (more_errno >> 8) & 255;
4352 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4353 else if (code > 100)
4354 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4358 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4359 printf("No retry information found\n");
4363 more_errno = yield->more_errno;
4364 printf("Retry rule: %s ", yield->pattern);
4366 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4368 printf("quota%s%s ",
4369 (more_errno > 0)? "_" : "",
4370 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4372 else if (yield->basic_errno == ECONNREFUSED)
4374 printf("refused%s%s ",
4375 (more_errno > 0)? "_" : "",
4376 (more_errno == 'M')? "MX" :
4377 (more_errno == 'A')? "A" : "");
4379 else if (yield->basic_errno == ETIMEDOUT)
4382 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4384 if (more_errno != 0) printf("_%s",
4385 (more_errno == 'M')? "MX" : "A");
4388 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4389 printf("auth_failed ");
4392 for (r = yield->rules; r; r = r->next)
4394 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4395 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4401 printf(",%d.", x/1000);
4415 exim_exit(EXIT_SUCCESS, US"main");
4418 /* Handle a request to list one or more configuration options */
4419 /* If -n was set, we suppress some information */
4424 set_process_info("listing variables");
4425 if (recipients_arg >= argc)
4426 fail = !readconf_print(US"all", NULL, flag_n);
4427 else for (i = recipients_arg; i < argc; i++)
4430 (Ustrcmp(argv[i], "router") == 0 ||
4431 Ustrcmp(argv[i], "transport") == 0 ||
4432 Ustrcmp(argv[i], "authenticator") == 0 ||
4433 Ustrcmp(argv[i], "macro") == 0 ||
4434 Ustrcmp(argv[i], "environment") == 0))
4436 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4440 fail = !readconf_print(argv[i], NULL, flag_n);
4442 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4447 set_process_info("listing config");
4448 exim_exit(readconf_print(US"config", NULL, flag_n)
4449 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4453 /* Initialise subsystems as required */
4454 #ifndef DISABLE_DKIM
4460 /* Handle a request to deliver one or more messages that are already on the
4461 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4462 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4464 Delivery of specific messages is typically used for a small number when
4465 prodding by hand (when the option forced_delivery will be set) or when
4466 re-execing to regain root privilege. Each message delivery must happen in a
4467 separate process, so we fork a process for each one, and run them sequentially
4468 so that debugging output doesn't get intertwined, and to avoid spawning too
4469 many processes if a long list is given. However, don't fork for the last one;
4470 this saves a process in the common case when Exim is called to deliver just one
4473 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4475 if (prod_requires_admin && !f.admin_user)
4477 fprintf(stderr, "exim: Permission denied\n");
4478 exim_exit(EXIT_FAILURE, US"main");
4480 set_process_info("delivering specified messages");
4481 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4482 for (i = msg_action_arg; i < argc; i++)
4487 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4488 else if ((pid = fork()) == 0)
4490 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4491 _exit(EXIT_SUCCESS);
4495 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4497 exim_exit(EXIT_FAILURE, US"main");
4501 exim_exit(EXIT_SUCCESS, US"main");
4505 /* If only a single queue run is requested, without SMTP listening, we can just
4506 turn into a queue runner, with an optional starting message id. */
4508 if (queue_interval == 0 && !f.daemon_listen)
4510 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4511 (start_queue_run_id == NULL)? US"" : US" starting at ",
4512 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4513 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4514 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4516 set_process_info("running the '%s' queue (single queue run)", queue_name);
4518 set_process_info("running the queue (single queue run)");
4519 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4520 exim_exit(EXIT_SUCCESS, US"main");
4524 /* Find the login name of the real user running this process. This is always
4525 needed when receiving a message, because it is written into the spool file. It
4526 may also be used to construct a from: or a sender: header, and in this case we
4527 need the user's full name as well, so save a copy of it, checked for RFC822
4528 syntax and munged if necessary, if it hasn't previously been set by the -F
4529 argument. We may try to get the passwd entry more than once, in case NIS or
4530 other delays are in evidence. Save the home directory for use in filter testing
4535 if ((pw = getpwuid(real_uid)) != NULL)
4537 originator_login = string_copy(US pw->pw_name);
4538 originator_home = string_copy(US pw->pw_dir);
4540 /* If user name has not been set by -F, set it from the passwd entry
4541 unless -f has been used to set the sender address by a trusted user. */
4543 if (!originator_name)
4545 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4547 uschar *name = US pw->pw_gecos;
4548 uschar *amp = Ustrchr(name, '&');
4551 /* Most Unix specify that a '&' character in the gecos field is
4552 replaced by a copy of the login name, and some even specify that
4553 the first character should be upper cased, so that's what we do. */
4558 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4559 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4560 buffer[loffset] = toupper(buffer[loffset]);
4564 /* If a pattern for matching the gecos field was supplied, apply
4565 it and then expand the name string. */
4567 if (gecos_pattern && gecos_name)
4570 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4572 if (regex_match_and_setup(re, name, 0, -1))
4574 uschar *new_name = expand_string(gecos_name);
4578 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4579 "gecos field \"%s\"\n", new_name, name);
4582 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4583 "\"%s\": %s\n", gecos_name, expand_string_message);
4585 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4586 "gecos field \"%s\"\n", gecos_pattern, name);
4587 store_free((void *)re);
4589 originator_name = string_copy(name);
4592 /* A trusted caller has used -f but not -F */
4594 else originator_name = US"";
4597 /* Break the retry loop */
4602 if (++i > finduser_retries) break;
4606 /* If we cannot get a user login, log the incident and give up, unless the
4607 configuration specifies something to use. When running in the test harness,
4608 any setting of unknown_login overrides the actual name. */
4610 if (originator_login == NULL || f.running_in_test_harness)
4612 if (unknown_login != NULL)
4614 originator_login = expand_string(unknown_login);
4615 if (originator_name == NULL && unknown_username != NULL)
4616 originator_name = expand_string(unknown_username);
4617 if (originator_name == NULL) originator_name = US"";
4619 if (originator_login == NULL)
4620 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4624 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4627 originator_name = string_copy(parse_fix_phrase(originator_name,
4628 Ustrlen(originator_name), big_buffer, big_buffer_size));
4630 /* If a message is created by this call of Exim, the uid/gid of its originator
4631 are those of the caller. These values are overridden if an existing message is
4632 read in from the spool. */
4634 originator_uid = real_uid;
4635 originator_gid = real_gid;
4637 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4638 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4640 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4641 returns. We leave this till here so that the originator_ fields are available
4642 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4645 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4649 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4650 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4651 "mua_wrapper is set");
4656 /* If the sender ident has not been set (by a trusted caller) set it to
4657 the caller. This will get overwritten below for an inetd call. If a trusted
4658 caller has set it empty, unset it. */
4660 if (sender_ident == NULL) sender_ident = originator_login;
4661 else if (sender_ident[0] == 0) sender_ident = NULL;
4663 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4664 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4665 originator_* variables set. */
4667 if (test_rewrite_arg >= 0)
4669 f.really_exim = FALSE;
4670 if (test_rewrite_arg >= argc)
4672 printf("-brw needs an address argument\n");
4673 exim_exit(EXIT_FAILURE, US"main");
4675 rewrite_test(argv[test_rewrite_arg]);
4676 exim_exit(EXIT_SUCCESS, US"main");
4679 /* A locally-supplied message is considered to be coming from a local user
4680 unless a trusted caller supplies a sender address with -f, or is passing in the
4681 message via SMTP (inetd invocation or otherwise). */
4683 if ((sender_address == NULL && !smtp_input) ||
4684 (!f.trusted_caller && filter_test == FTEST_NONE))
4686 f.sender_local = TRUE;
4688 /* A trusted caller can supply authenticated_sender and authenticated_id
4689 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4690 defaults except when host checking. */
4692 if (authenticated_sender == NULL && !host_checking)
4693 authenticated_sender = string_sprintf("%s@%s", originator_login,
4694 qualify_domain_sender);
4695 if (authenticated_id == NULL && !host_checking)
4696 authenticated_id = originator_login;
4699 /* Trusted callers are always permitted to specify the sender address.
4700 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4701 is specified is the empty address. However, if a trusted caller does not
4702 specify a sender address for SMTP input, we leave sender_address unset. This
4703 causes the MAIL commands to be honoured. */
4705 if ((!smtp_input && sender_address == NULL) ||
4706 !receive_check_set_sender(sender_address))
4708 /* Either the caller is not permitted to set a general sender, or this is
4709 non-SMTP input and the trusted caller has not set a sender. If there is no
4710 sender, or if a sender other than <> is set, override with the originator's
4711 login (which will get qualified below), except when checking things. */
4713 if (sender_address == NULL /* No sender_address set */
4715 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4716 !checking)) /* Not running tests, including filter tests */
4718 sender_address = originator_login;
4719 f.sender_address_forced = FALSE;
4720 sender_address_domain = 0;
4724 /* Remember whether an untrusted caller set the sender address */
4726 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4728 /* Ensure that the sender address is fully qualified unless it is the empty
4729 address, which indicates an error message, or doesn't exist (root caller, smtp
4730 interface, no -f argument). */
4732 if (sender_address != NULL && sender_address[0] != 0 &&
4733 sender_address_domain == 0)
4734 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4735 qualify_domain_sender);
4737 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4739 /* Handle a request to verify a list of addresses, or test them for delivery.
4740 This must follow the setting of the sender address, since routers can be
4741 predicated upon the sender. If no arguments are given, read addresses from
4742 stdin. Set debug_level to at least D_v to get full output for address testing.
4745 if (verify_address_mode || f.address_test_mode)
4748 int flags = vopt_qualify;
4750 if (verify_address_mode)
4752 if (!verify_as_sender) flags |= vopt_is_recipient;
4753 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4758 flags |= vopt_is_recipient;
4759 debug_selector |= D_v;
4760 debug_file = stderr;
4761 debug_fd = fileno(debug_file);
4762 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4765 if (recipients_arg < argc)
4767 while (recipients_arg < argc)
4769 uschar *s = argv[recipients_arg++];
4772 BOOL finished = FALSE;
4773 uschar *ss = parse_find_address_end(s, FALSE);
4774 if (*ss == ',') *ss = 0; else finished = TRUE;
4775 test_address(s, flags, &exit_value);
4778 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4785 uschar *s = get_stdinput(NULL, NULL);
4786 if (s == NULL) break;
4787 test_address(s, flags, &exit_value);
4791 exim_exit(exit_value, US"main");
4794 /* Handle expansion checking. Either expand items on the command line, or read
4795 from stdin if there aren't any. If -Mset was specified, load the message so
4796 that its variables can be used, but restrict this facility to admin users.
4797 Otherwise, if -bem was used, read a message from stdin. */
4801 dns_init(FALSE, FALSE, FALSE);
4802 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4804 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4806 exim_fail("exim: permission denied\n");
4807 message_id = argv[msg_action_arg];
4808 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4809 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4810 printf ("Failed to load message datafile %s\n", message_id);
4811 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4812 printf ("Failed to load message %s\n", message_id);
4815 /* Read a test message from a file. We fudge it up to be on stdin, saving
4816 stdin itself for later reading of expansion strings. */
4818 else if (expansion_test_message)
4820 int save_stdin = dup(0);
4821 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4823 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
4826 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4827 message_ended = END_NOTENDED;
4828 read_message_body(receive_msg(extract_recipients));
4829 message_linecount += body_linecount;
4830 (void)dup2(save_stdin, 0);
4831 (void)close(save_stdin);
4832 clearerr(stdin); /* Required by Darwin */
4835 /* Only admin users may see config-file macros this way */
4837 if (!f.admin_user) macros_user = macros = mlast = NULL;
4839 /* Allow $recipients for this testing */
4841 f.enable_dollar_recipients = TRUE;
4843 /* Expand command line items */
4845 if (recipients_arg < argc)
4846 while (recipients_arg < argc)
4847 expansion_test_line(argv[recipients_arg++]);
4853 char *(*fn_readline)(const char *) = NULL;
4854 void (*fn_addhist)(const char *) = NULL;
4858 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4861 while (s = get_stdinput(fn_readline, fn_addhist))
4862 expansion_test_line(s);
4865 if (dlhandle) dlclose(dlhandle);
4869 /* The data file will be open after -Mset */
4871 if (deliver_datafile >= 0)
4873 (void)close(deliver_datafile);
4874 deliver_datafile = -1;
4877 exim_exit(EXIT_SUCCESS, US"main: expansion test");
4881 /* The active host name is normally the primary host name, but it can be varied
4882 for hosts that want to play several parts at once. We need to ensure that it is
4883 set for host checking, and for receiving messages. */
4885 smtp_active_hostname = primary_hostname;
4886 if (raw_active_hostname != NULL)
4888 uschar *nah = expand_string(raw_active_hostname);
4891 if (!f.expand_string_forcedfail)
4892 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4893 "(smtp_active_hostname): %s", raw_active_hostname,
4894 expand_string_message);
4896 else if (nah[0] != 0) smtp_active_hostname = nah;
4899 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4900 given IP address so that the blocking and relay configuration can be tested.
4901 Unless a sender_ident was set by -oMt, we discard it (the default is the
4902 caller's login name). An RFC 1413 call is made only if we are running in the
4903 test harness and an incoming interface and both ports are specified, because
4904 there is no TCP/IP call to find the ident for. */
4911 if (!sender_ident_set)
4913 sender_ident = NULL;
4914 if (f.running_in_test_harness && sender_host_port != 0 &&
4915 interface_address != NULL && interface_port != 0)
4916 verify_get_ident(1413);
4919 /* In case the given address is a non-canonical IPv6 address, canonicalize
4920 it. The code works for both IPv4 and IPv6, as it happens. */
4922 size = host_aton(sender_host_address, x);
4923 sender_host_address = store_get(48); /* large enough for full IPv6 */
4924 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4926 /* Now set up for testing */
4928 host_build_sender_fullhost();
4932 f.sender_local = FALSE;
4933 f.sender_host_notsocket = TRUE;
4934 debug_file = stderr;
4935 debug_fd = fileno(debug_file);
4936 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4937 "**** but without any ident (RFC 1413) callback.\n"
4938 "**** This is not for real!\n\n",
4939 sender_host_address);
4941 memset(sender_host_cache, 0, sizeof(sender_host_cache));
4942 if (verify_check_host(&hosts_connection_nolog) == OK)
4943 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
4944 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4946 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4947 because a log line has already been written for all its failure exists
4948 (usually "connection refused: <reason>") and writing another one is
4949 unnecessary clutter. */
4951 if (smtp_start_session())
4953 for (reset_point = store_get(0); ; store_reset(reset_point))
4955 if (smtp_setup_msg() <= 0) break;
4956 if (!receive_msg(FALSE)) break;
4958 return_path = sender_address = NULL;
4959 dnslist_domain = dnslist_matched = NULL;
4960 #ifndef DISABLE_DKIM
4961 dkim_cur_signer = NULL;
4964 deliver_localpart_orig = NULL;
4965 deliver_domain_orig = NULL;
4966 callout_address = sending_ip_address = NULL;
4967 sender_rate = sender_rate_limit = sender_rate_period = NULL;
4971 exim_exit(EXIT_SUCCESS, US"main");
4975 /* Arrange for message reception if recipients or SMTP were specified;
4976 otherwise complain unless a version print (-bV) happened or this is a filter
4977 verification test or info dump.
4978 In the former case, show the configuration file name. */
4980 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4982 if (version_printed)
4984 if (Ustrchr(config_main_filelist, ':'))
4985 printf("Configuration file search path is %s\n", config_main_filelist);
4986 printf("Configuration file is %s\n", config_main_filename);
4987 return EXIT_SUCCESS;
4990 if (info_flag != CMDINFO_NONE)
4992 show_exim_information(info_flag, info_stdout ? stdout : stderr);
4993 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
4996 if (filter_test == FTEST_NONE)
4997 exim_usage(called_as);
5001 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5002 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5003 that we are not called from inetd, because that is rejected above. The
5004 following configuration settings are forced here:
5006 (1) Synchronous delivery (-odi)
5007 (2) Errors to stderr (-oep == -oeq)
5008 (3) No parallel remote delivery
5009 (4) Unprivileged delivery
5011 We don't force overall queueing options because there are several of them;
5012 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5013 to override any SMTP queueing. */
5017 f.synchronous_delivery = TRUE;
5018 arg_error_handling = ERRORS_STDERR;
5019 remote_max_parallel = 1;
5020 deliver_drop_privilege = TRUE;
5021 f.queue_smtp = FALSE;
5022 queue_smtp_domains = NULL;
5024 message_utf8_downconvert = -1; /* convert-if-needed */
5029 /* Prepare to accept one or more new messages on the standard input. When a
5030 message has been read, its id is returned in message_id[]. If doing immediate
5031 delivery, we fork a delivery process for each received message, except for the
5032 last one, where we can save a process switch.
5034 It is only in non-smtp mode that error_handling is allowed to be changed from
5035 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5036 sendmail error modes other than -oem ever actually used? Later: yes.) */
5038 if (!smtp_input) error_handling = arg_error_handling;
5040 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5041 logging being sent down the socket and make an identd call to get the
5044 else if (f.is_inetd)
5046 (void)fclose(stderr);
5047 exim_nullstd(); /* Re-open to /dev/null */
5048 verify_get_ident(IDENT_PORT);
5049 host_build_sender_fullhost();
5050 set_process_info("handling incoming connection from %s via inetd",
5054 /* If the sender host address has been set, build sender_fullhost if it hasn't
5055 already been done (which it will have been for inetd). This caters for the
5056 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5057 so that the test for IP options is skipped for -bs input. */
5059 if (sender_host_address && !sender_fullhost)
5061 host_build_sender_fullhost();
5062 set_process_info("handling incoming connection from %s via -oMa",
5064 f.sender_host_notsocket = TRUE;
5067 /* Otherwise, set the sender host as unknown except for inetd calls. This
5068 prevents host checking in the case of -bs not from inetd and also for -bS. */
5070 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5072 /* If stdout does not exist, then dup stdin to stdout. This can happen
5073 if exim is started from inetd. In this case fd 0 will be set to the socket,
5074 but fd 1 will not be set. This also happens for passed SMTP channels. */
5076 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5078 /* Set up the incoming protocol name and the state of the program. Root is
5079 allowed to force received protocol via the -oMr option above. If we have come
5080 via inetd, the process info has already been set up. We don't set
5081 received_protocol here for smtp input, as it varies according to
5082 batch/HELO/EHLO/AUTH/TLS. */
5086 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5087 smtp_batched_input? "batched " : "",
5088 (sender_address!= NULL)? sender_address : originator_login);
5092 int old_pool = store_pool;
5093 store_pool = POOL_PERM;
5094 if (!received_protocol)
5095 received_protocol = string_sprintf("local%s", called_as);
5096 store_pool = old_pool;
5097 set_process_info("accepting a local non-SMTP message from <%s>",
5101 /* Initialize the session_local_queue-only flag (this will be ignored if
5102 mua_wrapper is set) */
5105 session_local_queue_only = queue_only;
5107 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5108 the spool if so configured. On failure, we must not attempt to send an error
5109 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5110 error code is given.) */
5112 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5113 exim_fail("exim: insufficient disk space\n");
5115 /* If this is smtp input of any kind, real or batched, handle the start of the
5118 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5119 because a log line has already been written for all its failure exists
5120 (usually "connection refused: <reason>") and writing another one is
5121 unnecessary clutter. */
5127 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5128 if (verify_check_host(&hosts_connection_nolog) == OK)
5129 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5130 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5131 if (!smtp_start_session())
5134 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5138 /* Otherwise, set up the input size limit here. */
5142 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5143 if (expand_string_message)
5144 if (thismessage_size_limit == -1)
5145 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5146 "message_size_limit: %s", expand_string_message);
5148 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5149 "message_size_limit: %s", expand_string_message);
5152 /* Loop for several messages when reading SMTP input. If we fork any child
5153 processes, we don't want to wait for them unless synchronous delivery is
5154 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5155 same as SIG_DFL, despite the fact that documentation often lists the default as
5156 "ignore". This is a confusing area. This is what I know:
5158 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5159 processes that complete simply to go away without ever becoming defunct. You
5160 can't then wait for them - but we don't want to wait for them in the
5161 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5162 happen for all OS (e.g. *BSD is different).
5164 But that's not the end of the story. Some (many? all?) systems have the
5165 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5166 has by default, so it seems that the difference is merely one of default
5167 (compare restarting vs non-restarting signals).
5169 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5170 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5171 of the loop below. Paranoia rules.
5173 February 2003: That's *still* not the end of the story. There are now versions
5174 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5175 process then calls waitpid(), a grumble is written to the system log, because
5176 this is logically inconsistent. In other words, it doesn't like the paranoia.
5177 As a consequence of this, the waitpid() below is now excluded if we are sure
5178 that SIG_IGN works. */
5180 if (!f.synchronous_delivery)
5183 struct sigaction act;
5184 act.sa_handler = SIG_IGN;
5185 sigemptyset(&(act.sa_mask));
5186 act.sa_flags = SA_NOCLDWAIT;
5187 sigaction(SIGCHLD, &act, NULL);
5189 signal(SIGCHLD, SIG_IGN);
5193 /* Save the current store pool point, for resetting at the start of
5194 each message, and save the real sender address, if any. */
5196 reset_point = store_get(0);
5197 real_sender_address = sender_address;
5199 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5200 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5207 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5208 input and build the recipients list, before calling receive_msg() to read the
5209 message proper. Whatever sender address is given in the SMTP transaction is
5210 often ignored for local senders - we use the actual sender, which is normally
5211 either the underlying user running this process or a -f argument provided by
5212 a trusted caller. It is saved in real_sender_address. The test for whether to
5213 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5218 if ((rc = smtp_setup_msg()) > 0)
5220 if (real_sender_address != NULL &&
5221 !receive_check_set_sender(sender_address))
5223 sender_address = raw_sender = real_sender_address;
5224 sender_address_unrewritten = NULL;
5227 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5228 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5229 the very end. The result of the ACL is ignored (as for other non-SMTP
5230 messages). It is run for its potential side effects. */
5232 if (smtp_batched_input && acl_not_smtp_start != NULL)
5234 uschar *user_msg, *log_msg;
5235 f.enable_dollar_recipients = TRUE;
5236 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5237 &user_msg, &log_msg);
5238 f.enable_dollar_recipients = FALSE;
5241 /* Now get the data for the message */
5243 more = receive_msg(extract_recipients);
5244 if (message_id[0] == 0)
5246 cancel_cutthrough_connection(TRUE, US"receive dropped");
5247 if (more) goto moreloop;
5248 smtp_log_no_mail(); /* Log no mail if configured */
5249 exim_exit(EXIT_FAILURE, US"receive toplevel");
5254 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5255 smtp_log_no_mail(); /* Log no mail if configured */
5256 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5260 /* In the non-SMTP case, we have all the information from the command
5261 line, but must process it in case it is in the more general RFC822
5262 format, and in any case, to detect syntax errors. Also, it appears that
5263 the use of comma-separated lists as single arguments is common, so we
5264 had better support them. */
5270 int count = argc - recipients_arg;
5271 uschar **list = argv + recipients_arg;
5273 /* These options cannot be changed dynamically for non-SMTP messages */
5275 f.active_local_sender_retain = local_sender_retain;
5276 f.active_local_from_check = local_from_check;
5278 /* Save before any rewriting */
5280 raw_sender = string_copy(sender_address);
5282 /* Loop for each argument */
5284 for (i = 0; i < count; i++)
5286 int start, end, domain;
5288 uschar *s = list[i];
5290 /* Loop for each comma-separated address */
5294 BOOL finished = FALSE;
5296 uschar *ss = parse_find_address_end(s, FALSE);
5298 if (*ss == ',') *ss = 0; else finished = TRUE;
5300 /* Check max recipients - if -t was used, these aren't recipients */
5302 if (recipients_max > 0 && ++rcount > recipients_max &&
5303 !extract_recipients)
5304 if (error_handling == ERRORS_STDERR)
5306 fprintf(stderr, "exim: too many recipients\n");
5307 exim_exit(EXIT_FAILURE, US"main");
5311 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5312 errors_sender_rc : EXIT_FAILURE;
5316 BOOL b = allow_utf8_domains;
5317 allow_utf8_domains = TRUE;
5320 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5323 if (string_is_utf8(recipient))
5324 message_smtputf8 = TRUE;
5326 allow_utf8_domains = b;
5329 if (domain == 0 && !f.allow_unqualified_recipient)
5332 errmess = US"unqualified recipient address not allowed";
5335 if (recipient == NULL)
5337 if (error_handling == ERRORS_STDERR)
5339 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5340 string_printing(list[i]), errmess);
5341 exim_exit(EXIT_FAILURE, US"main");
5347 eblock.text1 = string_printing(list[i]);
5348 eblock.text2 = errmess;
5350 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5351 errors_sender_rc : EXIT_FAILURE;
5355 receive_add_recipient(recipient, -1);
5358 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5362 /* Show the recipients when debugging */
5367 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5368 if (recipients_list != NULL)
5370 debug_printf("Recipients:\n");
5371 for (i = 0; i < recipients_count; i++)
5372 debug_printf(" %s\n", recipients_list[i].address);
5376 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5377 ignored; rejecting here would just add complication, and it can just as
5378 well be done later. Allow $recipients to be visible in the ACL. */
5380 if (acl_not_smtp_start)
5382 uschar *user_msg, *log_msg;
5383 f.enable_dollar_recipients = TRUE;
5384 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5385 &user_msg, &log_msg);
5386 f.enable_dollar_recipients = FALSE;
5389 /* Pause for a while waiting for input. If none received in that time,
5390 close the logfile, if we had one open; then if we wait for a long-running
5391 datasource (months, in one use-case) log rotation will not leave us holding
5394 if (!receive_timeout)
5396 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5399 FD_ZERO(&r); FD_SET(0, &r);
5400 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5403 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5404 will just read the headers for the message, and not write anything onto the
5407 message_ended = END_NOTENDED;
5408 more = receive_msg(extract_recipients);
5410 /* more is always FALSE here (not SMTP message) when reading a message
5411 for real; when reading the headers of a message for filter testing,
5412 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5414 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5415 } /* Non-SMTP message reception */
5417 /* If this is a filter testing run, there are headers in store, but
5418 no message on the spool. Run the filtering code in testing mode, setting
5419 the domain to the qualify domain and the local part to the current user,
5420 unless they have been set by options. The prefix and suffix are left unset
5421 unless specified. The the return path is set to to the sender unless it has
5422 already been set from a return-path header in the message. */
5424 if (filter_test != FTEST_NONE)
5426 deliver_domain = (ftest_domain != NULL)?
5427 ftest_domain : qualify_domain_recipient;
5428 deliver_domain_orig = deliver_domain;
5429 deliver_localpart = (ftest_localpart != NULL)?
5430 ftest_localpart : originator_login;
5431 deliver_localpart_orig = deliver_localpart;
5432 deliver_localpart_prefix = ftest_prefix;
5433 deliver_localpart_suffix = ftest_suffix;
5434 deliver_home = originator_home;
5436 if (return_path == NULL)
5438 printf("Return-path copied from sender\n");
5439 return_path = string_copy(sender_address);
5442 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5443 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5445 receive_add_recipient(
5446 string_sprintf("%s%s%s@%s",
5447 (ftest_prefix == NULL)? US"" : ftest_prefix,
5449 (ftest_suffix == NULL)? US"" : ftest_suffix,
5450 deliver_domain), -1);
5452 printf("Recipient = %s\n", recipients_list[0].address);
5453 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5454 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5456 if (chdir("/")) /* Get away from wherever the user is running this from */
5458 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5459 exim_exit(EXIT_FAILURE, US"main");
5462 /* Now we run either a system filter test, or a user filter test, or both.
5463 In the latter case, headers added by the system filter will persist and be
5464 available to the user filter. We need to copy the filter variables
5467 if ((filter_test & FTEST_SYSTEM) != 0)
5468 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5469 exim_exit(EXIT_FAILURE, US"main");
5471 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5473 if ((filter_test & FTEST_USER) != 0)
5474 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5475 exim_exit(EXIT_FAILURE, US"main");
5477 exim_exit(EXIT_SUCCESS, US"main");
5480 /* Else act on the result of message reception. We should not get here unless
5481 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5482 will be TRUE. If it is not, check on the number of messages received in this
5485 if (!session_local_queue_only &&
5486 smtp_accept_queue_per_connection > 0 &&
5487 receive_messagecount > smtp_accept_queue_per_connection)
5489 session_local_queue_only = TRUE;
5490 queue_only_reason = 2;
5493 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5494 and queue_only_load is set, check that the load average is below it. If it is
5495 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5496 default), we put the whole session into queue_only mode. It then remains this
5497 way for any subsequent messages on the same SMTP connection. This is a
5498 deliberate choice; even though the load average may fall, it doesn't seem
5499 right to deliver later messages on the same call when not delivering earlier
5500 ones. However, there are odd cases where this is not wanted, so this can be
5501 changed by setting queue_only_load_latch false. */
5503 local_queue_only = session_local_queue_only;
5504 if (!local_queue_only && queue_only_load >= 0)
5506 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5507 if (local_queue_only)
5509 queue_only_reason = 3;
5510 if (queue_only_load_latch) session_local_queue_only = TRUE;
5514 /* If running as an MUA wrapper, all queueing options and freezing options
5518 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5520 /* Log the queueing here, when it will get a message id attached, but
5521 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5524 if (local_queue_only)
5526 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5527 switch(queue_only_reason)
5530 log_write(L_delay_delivery,
5531 LOG_MAIN, "no immediate delivery: more than %d messages "
5532 "received in one connection", smtp_accept_queue_per_connection);
5536 log_write(L_delay_delivery,
5537 LOG_MAIN, "no immediate delivery: load average %.2f",
5538 (double)load_average/1000.0);
5543 else if (f.queue_only_policy || f.deliver_freeze)
5544 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5546 /* Else do the delivery unless the ACL or local_scan() called for queue only
5547 or froze the message. Always deliver in a separate process. A fork failure is
5548 not a disaster, as the delivery will eventually happen on a subsequent queue
5549 run. The search cache must be tidied before the fork, as the parent will
5550 do it before exiting. The child will trigger a lookup failure and
5551 thereby defer the delivery if it tries to use (for example) a cached ldap
5552 connection that the parent has called unbind on. */
5559 if ((pid = fork()) == 0)
5562 close_unwanted(); /* Close unwanted file descriptors and TLS */
5563 exim_nullstd(); /* Ensure std{in,out,err} exist */
5565 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5566 mode, deliver_drop_privilege is forced TRUE). */
5568 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5570 delivery_re_exec(CEE_EXEC_EXIT);
5571 /* Control does not return here. */
5574 /* No need to re-exec */
5576 rc = deliver_message(message_id, FALSE, FALSE);
5578 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5579 EXIT_SUCCESS : EXIT_FAILURE);
5584 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5585 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5586 "process: %s", strerror(errno));
5590 release_cutthrough_connection(US"msg passed for delivery");
5592 /* In the parent, wait if synchronous delivery is required. This will
5593 always be the case in MUA wrapper mode. */
5595 if (f.synchronous_delivery)
5598 while (wait(&status) != pid);
5599 if ((status & 0x00ff) != 0)
5600 log_write(0, LOG_MAIN|LOG_PANIC,
5601 "process %d crashed with signal %d while delivering %s",
5602 (int)pid, status & 0x00ff, message_id);
5603 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5608 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5609 automatically reaps children (see comments above the loop), clear away any
5610 finished subprocesses here, in case there are lots of messages coming in
5611 from the same source. */
5613 #ifndef SIG_IGN_WORKS
5614 while (waitpid(-1, NULL, WNOHANG) > 0);
5618 return_path = sender_address = NULL;
5619 authenticated_sender = NULL;
5620 deliver_localpart_orig = NULL;
5621 deliver_domain_orig = NULL;
5622 deliver_host = deliver_host_address = NULL;
5623 dnslist_domain = dnslist_matched = NULL;
5624 #ifdef WITH_CONTENT_SCAN
5625 malware_name = NULL;
5627 callout_address = NULL;
5628 sending_ip_address = NULL;
5630 { int i; for(i=0; i<REGEX_VARS; i++) regex_vars[i] = NULL; }
5632 store_reset(reset_point);
5635 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5636 return 0; /* To stop compiler warning */