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, nelem(ovector));
145 if (n == 0) n = EXPAND_MAXN + 1;
148 expand_nmax = setup < 0 ? 0 : setup + 1;
149 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
151 expand_nstring[expand_nmax] = s + ovector[nn];
152 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
162 /*************************************************
163 * Set up processing details *
164 *************************************************/
166 /* Save a text string for dumping when SIGUSR1 is received.
167 Do checks for overruns.
169 Arguments: format and arguments, as for printf()
174 set_process_info(const char *format, ...)
176 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
181 g = string_fmt_append(&gs, "%5d ", (int)getpid());
183 va_start(ap, format);
184 if (!string_vformat(g, FALSE, format, ap))
187 g = string_cat(&gs, US"**** string overflowed buffer ****");
189 g = string_catn(g, US"\n", 1);
190 string_from_gstring(g);
191 process_info_len = g->ptr;
192 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
196 /***********************************************
197 * Handler for SIGTERM *
198 ***********************************************/
201 term_handler(int sig)
207 /*************************************************
208 * Handler for SIGUSR1 *
209 *************************************************/
211 /* SIGUSR1 causes any exim process to write to the process log details of
212 what it is currently doing. It will only be used if the OS is capable of
213 setting up a handler that causes automatic restarting of any system call
214 that is in progress at the time.
216 This function takes care to be signal-safe.
218 Argument: the signal number (SIGUSR1)
223 usr1_handler(int sig)
227 os_restarting_signal(sig, usr1_handler);
229 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
231 /* If we are already running as the Exim user, try to create it in the
232 current process (assuming spool_directory exists). Otherwise, if we are
233 root, do the creation in an exim:exim subprocess. */
235 int euid = geteuid();
236 if (euid == exim_uid)
237 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
238 else if (euid == root_uid)
239 fd = log_create_as_exim(process_log_path);
242 /* If we are neither exim nor root, or if we failed to create the log file,
243 give up. There is not much useful we can do with errors, since we don't want
244 to disrupt whatever is going on outside the signal handler. */
248 (void)write(fd, process_info, process_info_len);
254 /*************************************************
256 *************************************************/
258 /* This handler is enabled most of the time that Exim is running. The handler
259 doesn't actually get used unless alarm() has been called to set a timer, to
260 place a time limit on a system call of some kind. When the handler is run, it
263 There are some other SIGALRM handlers that are used in special cases when more
264 than just a flag setting is required; for example, when reading a message's
265 input. These are normally set up in the code module that uses them, and the
266 SIGALRM handler is reset to this one afterwards.
268 Argument: the signal value (SIGALRM)
273 sigalrm_handler(int sig)
275 sig = sig; /* Keep picky compilers happy */
277 os_non_restarting_signal(SIGALRM, sigalrm_handler);
282 /*************************************************
283 * Sleep for a fractional time interval *
284 *************************************************/
286 /* This function is called by millisleep() and exim_wait_tick() to wait for a
287 period of time that may include a fraction of a second. The coding is somewhat
288 tedious. We do not expect setitimer() ever to fail, but if it does, the process
289 will wait for ever, so we panic in this instance. (There was a case of this
290 when a bug in a function that calls milliwait() caused it to pass invalid data.
291 That's when I added the check. :-)
293 We assume it to be not worth sleeping for under 100us; this value will
294 require revisiting as hardware advances. This avoids the issue of
295 a zero-valued timer setting meaning "never fire".
297 Argument: an itimerval structure containing the interval
302 milliwait(struct itimerval *itval)
305 sigset_t old_sigmask;
307 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
309 (void)sigemptyset(&sigmask); /* Empty mask */
310 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
311 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
312 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
313 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
314 "setitimer() failed: %s", strerror(errno));
315 (void)sigfillset(&sigmask); /* All signals */
316 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
317 (void)sigsuspend(&sigmask); /* Until SIGALRM */
318 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
324 /*************************************************
325 * Millisecond sleep function *
326 *************************************************/
328 /* The basic sleep() function has a granularity of 1 second, which is too rough
329 in some cases - for example, when using an increasing delay to slow down
332 Argument: number of millseconds
339 struct itimerval itval;
340 itval.it_interval.tv_sec = 0;
341 itval.it_interval.tv_usec = 0;
342 itval.it_value.tv_sec = msec/1000;
343 itval.it_value.tv_usec = (msec % 1000) * 1000;
349 /*************************************************
350 * Compare microsecond times *
351 *************************************************/
358 Returns: -1, 0, or +1
362 exim_tvcmp(struct timeval *t1, struct timeval *t2)
364 if (t1->tv_sec > t2->tv_sec) return +1;
365 if (t1->tv_sec < t2->tv_sec) return -1;
366 if (t1->tv_usec > t2->tv_usec) return +1;
367 if (t1->tv_usec < t2->tv_usec) return -1;
374 /*************************************************
375 * Clock tick wait function *
376 *************************************************/
378 /* Exim uses a time + a pid to generate a unique identifier in two places: its
379 message IDs, and in file names for maildir deliveries. Because some OS now
380 re-use pids within the same second, sub-second times are now being used.
381 However, for absolute certainty, we must ensure the clock has ticked before
382 allowing the relevant process to complete. At the time of implementation of
383 this code (February 2003), the speed of processors is such that the clock will
384 invariably have ticked already by the time a process has done its job. This
385 function prepares for the time when things are faster - and it also copes with
386 clocks that go backwards.
389 then_tv A timeval which was used to create uniqueness; its usec field
390 has been rounded down to the value of the resolution.
391 We want to be sure the current time is greater than this.
392 resolution The resolution that was used to divide the microseconds
393 (1 for maildir, larger for message ids)
399 exim_wait_tick(struct timeval *then_tv, int resolution)
401 struct timeval now_tv;
402 long int now_true_usec;
404 (void)gettimeofday(&now_tv, NULL);
405 now_true_usec = now_tv.tv_usec;
406 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
408 if (exim_tvcmp(&now_tv, then_tv) <= 0)
410 struct itimerval itval;
411 itval.it_interval.tv_sec = 0;
412 itval.it_interval.tv_usec = 0;
413 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
414 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
416 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
417 negative value for the microseconds is possible only in the case when "now"
418 is more than a second less than "then". That means that itval.it_value.tv_sec
419 is greater than zero. The following correction is therefore safe. */
421 if (itval.it_value.tv_usec < 0)
423 itval.it_value.tv_usec += 1000000;
424 itval.it_value.tv_sec -= 1;
427 DEBUG(D_transport|D_receive)
429 if (!f.running_in_test_harness)
431 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
432 then_tv->tv_sec, (long) then_tv->tv_usec,
433 now_tv.tv_sec, (long) now_tv.tv_usec);
434 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
435 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
446 /*************************************************
447 * Call fopen() with umask 777 and adjust mode *
448 *************************************************/
450 /* Exim runs with umask(0) so that files created with open() have the mode that
451 is specified in the open() call. However, there are some files, typically in
452 the spool directory, that are created with fopen(). They end up world-writeable
453 if no precautions are taken. Although the spool directory is not accessible to
454 the world, this is an untidiness. So this is a wrapper function for fopen()
455 that sorts out the mode of the created file.
458 filename the file name
459 options the fopen() options
460 mode the required mode
462 Returns: the fopened FILE or NULL
466 modefopen(const uschar *filename, const char *options, mode_t mode)
468 mode_t saved_umask = umask(0777);
469 FILE *f = Ufopen(filename, options);
470 (void)umask(saved_umask);
471 if (f != NULL) (void)fchmod(fileno(f), mode);
478 /*************************************************
479 * Ensure stdin, stdout, and stderr exist *
480 *************************************************/
482 /* Some operating systems grumble if an exec() happens without a standard
483 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
484 file will be opened and will use these fd values, and then some other bit of
485 code will assume, for example, that it can write error messages to stderr.
486 This function ensures that fds 0, 1, and 2 are open if they do not already
487 exist, by connecting them to /dev/null.
489 This function is also used to ensure that std{in,out,err} exist at all times,
490 so that if any library that Exim calls tries to use them, it doesn't crash.
501 for (int i = 0; i <= 2; i++)
503 if (fstat(i, &statbuf) < 0 && errno == EBADF)
505 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
506 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
507 string_open_failed(errno, "/dev/null"));
508 if (devnull != i) (void)dup2(devnull, i);
511 if (devnull > 2) (void)close(devnull);
517 /*************************************************
518 * Close unwanted file descriptors for delivery *
519 *************************************************/
521 /* This function is called from a new process that has been forked to deliver
522 an incoming message, either directly, or using exec.
524 We want any smtp input streams to be closed in this new process. However, it
525 has been observed that using fclose() here causes trouble. When reading in -bS
526 input, duplicate copies of messages have been seen. The files will be sharing a
527 file pointer with the parent process, and it seems that fclose() (at least on
528 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
529 least sometimes. Hence we go for closing the underlying file descriptors.
531 If TLS is active, we want to shut down the TLS library, but without molesting
532 the parent's SSL connection.
534 For delivery of a non-SMTP message, we want to close stdin and stdout (and
535 stderr unless debugging) because the calling process might have set them up as
536 pipes and be waiting for them to close before it waits for the submission
537 process to terminate. If they aren't closed, they hold up the calling process
538 until the initial delivery process finishes, which is not what we want.
540 Exception: We do want it for synchronous delivery!
542 And notwithstanding all the above, if D_resolver is set, implying resolver
543 debugging, leave stdout open, because that's where the resolver writes its
546 When we close stderr (which implies we've also closed stdout), we also get rid
547 of any controlling terminal.
559 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
561 (void)close(fileno(smtp_in));
562 (void)close(fileno(smtp_out));
567 (void)close(0); /* stdin */
568 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
569 if (debug_selector == 0) /* stderr */
571 if (!f.synchronous_delivery)
584 /*************************************************
586 *************************************************/
588 /* This function sets a new uid and gid permanently, optionally calling
589 initgroups() to set auxiliary groups. There are some special cases when running
590 Exim in unprivileged modes. In these situations the effective uid will not be
591 root; if we already have the right effective uid/gid, and don't need to
592 initialize any groups, leave things as they are.
597 igflag TRUE if initgroups() wanted
598 msg text to use in debugging output and failure log
600 Returns: nothing; bombs out on failure
604 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
606 uid_t euid = geteuid();
607 gid_t egid = getegid();
609 if (euid == root_uid || euid != uid || egid != gid || igflag)
611 /* At least one OS returns +1 for initgroups failure, so just check for
616 struct passwd *pw = getpwuid(uid);
618 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
619 "no passwd entry for uid=%ld", (long int)uid);
621 if (initgroups(pw->pw_name, gid) != 0)
622 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
623 (long int)uid, strerror(errno));
626 if (setgid(gid) < 0 || setuid(uid) < 0)
627 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
628 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
631 /* Debugging output included uid/gid and all groups */
635 int group_count, save_errno;
636 gid_t group_list[EXIM_GROUPLIST_SIZE];
637 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
638 (long int)geteuid(), (long int)getegid(), (long int)getpid());
639 group_count = getgroups(nelem(group_list), group_list);
641 debug_printf(" auxiliary group list:");
643 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
644 else if (group_count < 0)
645 debug_printf(" <error: %s>", strerror(save_errno));
646 else debug_printf(" <none>");
654 /*************************************************
656 *************************************************/
658 /* Exim exits via this function so that it always clears up any open
664 Returns: does not return
668 exim_exit(int rc, const uschar * process)
672 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
673 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
674 process ? "(" : "", process, process ? ") " : "", rc);
680 /* Print error string, then die */
682 exim_fail(const char * fmt, ...)
686 vfprintf(stderr, fmt, ap);
692 /*************************************************
693 * Extract port from host address *
694 *************************************************/
696 /* Called to extract the port from the values given to -oMa and -oMi.
697 It also checks the syntax of the address, and terminates it before the
698 port data when a port is extracted.
701 address the address, with possible port on the end
703 Returns: the port, or zero if there isn't one
704 bombs out on a syntax error
708 check_port(uschar *address)
710 int port = host_address_extract_port(address);
711 if (string_is_ip_address(address, NULL) == 0)
712 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
718 /*************************************************
719 * Test/verify an address *
720 *************************************************/
722 /* This function is called by the -bv and -bt code. It extracts a working
723 address from a full RFC 822 address. This isn't really necessary per se, but it
724 has the effect of collapsing source routes.
728 flags flag bits for verify_address()
729 exit_value to be set for failures
735 test_address(uschar *s, int flags, int *exit_value)
737 int start, end, domain;
738 uschar *parse_error = NULL;
739 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
743 fprintf(stdout, "syntax error: %s\n", parse_error);
748 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
749 -1, -1, NULL, NULL, NULL);
750 if (rc == FAIL) *exit_value = 2;
751 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
757 /*************************************************
758 * Show supported features *
759 *************************************************/
762 show_db_version(FILE * f)
764 #ifdef DB_VERSION_STRING
767 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
768 fprintf(f, " Runtime: %s\n",
769 db_version(NULL, NULL, NULL));
772 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
774 #elif defined(BTREEVERSION) && defined(HASHVERSION)
776 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
778 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
781 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
782 fprintf(f, "Probably ndbm\n");
783 #elif defined(USE_TDB)
784 fprintf(f, "Using tdb\n");
787 fprintf(f, "Probably GDBM (native mode)\n");
789 fprintf(f, "Probably GDBM (compatibility mode)\n");
795 /* This function is called for -bV/--version and for -d to output the optional
796 features of the current Exim binary.
798 Arguments: a FILE for printing
803 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_PIPE_CONNECT
907 fprintf(fp, " Experimental_PIPE_CONNECT");
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_JSON) && LOOKUP_JSON!=2
931 fprintf(fp, " json");
933 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
934 fprintf(fp, " ldap ldapdn ldapm");
936 #ifdef EXPERIMENTAL_LMDB
937 fprintf(fp, " lmdb");
939 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
940 fprintf(fp, " mysql");
942 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
943 fprintf(fp, " nis nis0");
945 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
946 fprintf(fp, " nisplus");
948 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
949 fprintf(fp, " oracle");
951 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
952 fprintf(fp, " passwd");
954 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
955 fprintf(fp, " pgsql");
957 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
958 fprintf(fp, " redis");
960 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
961 fprintf(fp, " sqlite");
963 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
964 fprintf(fp, " testdb");
966 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
967 fprintf(fp, " whoson");
971 auth_show_supported(fp);
972 route_show_supported(fp);
973 transport_show_supported(fp);
975 #ifdef WITH_CONTENT_SCAN
976 malware_show_supported(fp);
979 if (fixed_never_users[0] > 0)
982 fprintf(fp, "Fixed never_users: ");
983 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
984 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
985 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
988 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
990 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
992 /* Everything else is details which are only worth reporting when debugging.
993 Perhaps the tls_version_report should move into this too. */
996 /* clang defines __GNUC__ (at least, for me) so test for it first */
997 #if defined(__clang__)
998 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
999 #elif defined(__GNUC__)
1000 fprintf(fp, "Compiler: GCC [%s]\n",
1004 "? unknown version ?"
1008 fprintf(fp, "Compiler: <unknown>\n");
1011 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1012 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1013 __GLIBC__, __GLIBC_MINOR__);
1014 if (__GLIBC_PREREQ(2, 1))
1015 fprintf(fp, " Runtime: %s\n",
1016 gnu_get_libc_version());
1019 show_db_version(fp);
1022 tls_version_report(fp);
1025 utf8_version_report(fp);
1028 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1029 if (authi->version_report)
1030 (*authi->version_report)(fp);
1032 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1033 characters; unless it's an ancient version of PCRE in which case it
1035 #ifndef PCRE_PRERELEASE
1036 # define PCRE_PRERELEASE
1039 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1040 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1042 PCRE_MAJOR, PCRE_MINOR,
1043 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1046 #undef EXPAND_AND_QUOTE
1049 for (int i = 0; i < lookup_list_count; i++)
1050 if (lookup_list[i]->version_report)
1051 lookup_list[i]->version_report(fp);
1053 #ifdef WHITELIST_D_MACROS
1054 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1056 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1058 #ifdef TRUSTED_CONFIG_LIST
1059 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1061 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1068 /*************************************************
1069 * Show auxiliary information about Exim *
1070 *************************************************/
1073 show_exim_information(enum commandline_info request, FILE *stream)
1078 fprintf(stream, "Oops, something went wrong.\n");
1082 "The -bI: flag takes a string indicating which information to provide.\n"
1083 "If the string is not recognised, you'll get this help (on stderr).\n"
1085 " exim -bI:help this information\n"
1086 " exim -bI:dscp list of known dscp value keywords\n"
1087 " exim -bI:sieve list of supported sieve extensions\n"
1091 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1092 fprintf(stream, "%s\n", *pp);
1095 dscp_list_to_stream(stream);
1101 /*************************************************
1102 * Quote a local part *
1103 *************************************************/
1105 /* This function is used when a sender address or a From: or Sender: header
1106 line is being created from the caller's login, or from an authenticated_id. It
1107 applies appropriate quoting rules for a local part.
1109 Argument: the local part
1110 Returns: the local part, quoted if necessary
1114 local_part_quote(uschar *lpart)
1116 BOOL needs_quote = FALSE;
1119 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1121 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1122 (*t != '.' || t == lpart || t[1] == 0);
1125 if (!needs_quote) return lpart;
1127 g = string_catn(NULL, US"\"", 1);
1131 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1134 g = string_cat(g, lpart);
1137 g = string_catn(g, lpart, nq - lpart);
1138 g = string_catn(g, US"\\", 1);
1139 g = string_catn(g, nq, 1);
1143 g = string_catn(g, US"\"", 1);
1144 return string_from_gstring(g);
1150 /*************************************************
1151 * Load readline() functions *
1152 *************************************************/
1154 /* This function is called from testing executions that read data from stdin,
1155 but only when running as the calling user. Currently, only -be does this. The
1156 function loads the readline() function library and passes back the functions.
1157 On some systems, it needs the curses library, so load that too, but try without
1158 it if loading fails. All this functionality has to be requested at build time.
1161 fn_readline_ptr pointer to where to put the readline pointer
1162 fn_addhist_ptr pointer to where to put the addhistory function
1164 Returns: the dlopen handle or NULL on failure
1168 set_readline(char * (**fn_readline_ptr)(const char *),
1169 void (**fn_addhist_ptr)(const char *))
1172 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1174 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1175 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1177 if (dlhandle != NULL)
1179 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1180 * char * readline (const char *prompt);
1181 * void add_history (const char *string);
1183 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1184 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1188 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1197 /*************************************************
1198 * Get a line from stdin for testing things *
1199 *************************************************/
1201 /* This function is called when running tests that can take a number of lines
1202 of input (for example, -be and -bt). It handles continuations and trailing
1203 spaces. And prompting and a blank line output on eof. If readline() is in use,
1204 the arguments are non-NULL and provide the relevant functions.
1207 fn_readline readline function or NULL
1208 fn_addhist addhist function or NULL
1210 Returns: pointer to dynamic memory, or NULL at end of file
1214 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1218 if (!fn_readline) { printf("> "); fflush(stdout); }
1220 for (int i = 0;; i++)
1222 uschar buffer[1024];
1226 char *readline_line = NULL;
1227 if (fn_readline != NULL)
1229 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1230 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1231 p = US readline_line;
1236 /* readline() not in use */
1239 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1243 /* Handle the line */
1245 ss = p + (int)Ustrlen(p);
1246 while (ss > p && isspace(ss[-1])) ss--;
1250 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1253 g = string_catn(g, p, ss - p);
1256 if (fn_readline) free(readline_line);
1259 /* g can only be NULL if ss==p */
1260 if (ss == p || g->s[g->ptr-1] != '\\')
1264 (void) string_from_gstring(g);
1267 if (!g) printf("\n");
1268 return string_from_gstring(g);
1273 /*************************************************
1274 * Output usage information for the program *
1275 *************************************************/
1277 /* This function is called when there are no recipients
1278 or a specific --help argument was added.
1281 progname information on what name we were called by
1283 Returns: DOES NOT RETURN
1287 exim_usage(uschar *progname)
1290 /* Handle specific program invocation variants */
1291 if (Ustrcmp(progname, US"-mailq") == 0)
1293 "mailq - list the contents of the mail queue\n\n"
1294 "For a list of options, see the Exim documentation.\n");
1296 /* Generic usage - we output this whatever happens */
1298 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1299 "not directly from a shell command line. Options and/or arguments control\n"
1300 "what it does when called. For a list of options, see the Exim documentation.\n");
1305 /*************************************************
1306 * Validate that the macros given are okay *
1307 *************************************************/
1309 /* Typically, Exim will drop privileges if macros are supplied. In some
1310 cases, we want to not do so.
1312 Arguments: opt_D_used - true if the commandline had a "-D" option
1313 Returns: true if trusted, false otherwise
1317 macros_trusted(BOOL opt_D_used)
1319 #ifdef WHITELIST_D_MACROS
1320 uschar *whitelisted, *end, *p, **whites;
1321 int white_count, i, n;
1323 BOOL prev_char_item, found;
1328 #ifndef WHITELIST_D_MACROS
1332 /* We only trust -D overrides for some invoking users:
1333 root, the exim run-time user, the optional config owner user.
1334 I don't know why config-owner would be needed, but since they can own the
1335 config files anyway, there's no security risk to letting them override -D. */
1336 if ( ! ((real_uid == root_uid)
1337 || (real_uid == exim_uid)
1338 #ifdef CONFIGURE_OWNER
1339 || (real_uid == config_uid)
1343 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1347 /* Get a list of macros which are whitelisted */
1348 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1349 prev_char_item = FALSE;
1351 for (p = whitelisted; *p != '\0'; ++p)
1353 if (*p == ':' || isspace(*p))
1358 prev_char_item = FALSE;
1361 if (!prev_char_item)
1362 prev_char_item = TRUE;
1369 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1370 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1375 if (i == white_count)
1377 while (*p != '\0' && p < end)
1383 /* The list of commandline macros should be very short.
1384 Accept the N*M complexity. */
1385 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1388 for (uschar ** w = whites; *w; ++w)
1389 if (Ustrcmp(*w, m->name) == 0)
1396 if (!m->replacement)
1398 if ((len = m->replen) == 0)
1400 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1401 0, PCRE_EOPT, NULL, 0);
1404 if (n != PCRE_ERROR_NOMATCH)
1405 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1409 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1415 /*************************************************
1416 * Expansion testing *
1417 *************************************************/
1419 /* Expand and print one item, doing macro-processing.
1422 item line for expansion
1426 expansion_test_line(uschar * line)
1431 Ustrncpy(big_buffer, line, big_buffer_size);
1432 big_buffer[big_buffer_size-1] = '\0';
1433 len = Ustrlen(big_buffer);
1435 (void) macros_expand(0, &len, &dummy_macexp);
1437 if (isupper(big_buffer[0]))
1439 if (macro_read_assignment(big_buffer))
1440 printf("Defined macro '%s'\n", mlast->name);
1443 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1444 else printf("Failed: %s\n", expand_string_message);
1449 /*************************************************
1450 * Entry point and high-level code *
1451 *************************************************/
1453 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1454 the appropriate action. All the necessary functions are present in the one
1455 binary. I originally thought one should split it up, but it turns out that so
1456 much of the apparatus is needed in each chunk that one might as well just have
1457 it all available all the time, which then makes the coding easier as well.
1460 argc count of entries in argv
1461 argv argument strings, with argv[0] being the program name
1463 Returns: EXIT_SUCCESS if terminated successfully
1464 EXIT_FAILURE otherwise, except when a message has been sent
1465 to the sender, and -oee was given
1469 main(int argc, char **cargv)
1471 uschar **argv = USS cargv;
1472 int arg_receive_timeout = -1;
1473 int arg_smtp_receive_timeout = -1;
1474 int arg_error_handling = error_handling;
1475 int filter_sfd = -1;
1476 int filter_ufd = -1;
1479 int list_queue_option = 0;
1481 int msg_action_arg = -1;
1482 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1483 int queue_only_reason = 0;
1485 int perl_start_option = 0;
1487 int recipients_arg = argc;
1488 int sender_address_domain = 0;
1489 int test_retry_arg = -1;
1490 int test_rewrite_arg = -1;
1491 gid_t original_egid;
1492 BOOL arg_queue_only = FALSE;
1493 BOOL bi_option = FALSE;
1494 BOOL checking = FALSE;
1495 BOOL count_queue = FALSE;
1496 BOOL expansion_test = FALSE;
1497 BOOL extract_recipients = FALSE;
1498 BOOL flag_G = FALSE;
1499 BOOL flag_n = FALSE;
1500 BOOL forced_delivery = FALSE;
1501 BOOL f_end_dot = FALSE;
1502 BOOL deliver_give_up = FALSE;
1503 BOOL list_queue = FALSE;
1504 BOOL list_options = FALSE;
1505 BOOL list_config = FALSE;
1506 BOOL local_queue_only;
1508 BOOL one_msg_action = FALSE;
1509 BOOL opt_D_used = FALSE;
1510 BOOL queue_only_set = FALSE;
1511 BOOL receiving_message = TRUE;
1512 BOOL sender_ident_set = FALSE;
1513 BOOL session_local_queue_only;
1515 BOOL removed_privilege = FALSE;
1516 BOOL usage_wanted = FALSE;
1517 BOOL verify_address_mode = FALSE;
1518 BOOL verify_as_sender = FALSE;
1519 BOOL version_printed = FALSE;
1520 uschar *alias_arg = NULL;
1521 uschar *called_as = US"";
1522 uschar *cmdline_syslog_name = NULL;
1523 uschar *start_queue_run_id = NULL;
1524 uschar *stop_queue_run_id = NULL;
1525 uschar *expansion_test_message = NULL;
1526 uschar *ftest_domain = NULL;
1527 uschar *ftest_localpart = NULL;
1528 uschar *ftest_prefix = NULL;
1529 uschar *ftest_suffix = NULL;
1530 uschar *log_oneline = NULL;
1531 uschar *malware_test_file = NULL;
1532 uschar *real_sender_address;
1533 uschar *originator_home = US"/";
1538 struct stat statbuf;
1539 pid_t passed_qr_pid = (pid_t)0;
1540 int passed_qr_pipe = -1;
1541 gid_t group_list[EXIM_GROUPLIST_SIZE];
1543 /* For the -bI: flag */
1544 enum commandline_info info_flag = CMDINFO_NONE;
1545 BOOL info_stdout = FALSE;
1547 /* Possible options for -R and -S */
1549 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1551 /* Need to define this in case we need to change the environment in order
1552 to get rid of a bogus time zone. We have to make it char rather than uschar
1553 because some OS define it in /usr/include/unistd.h. */
1555 extern char **environ;
1557 /* If the Exim user and/or group and/or the configuration file owner/group were
1558 defined by ref:name at build time, we must now find the actual uid/gid values.
1559 This is a feature to make the lives of binary distributors easier. */
1561 #ifdef EXIM_USERNAME
1562 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1565 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1567 /* If ref:name uses a number as the name, route_finduser() returns
1568 TRUE with exim_uid set and pw coerced to NULL. */
1570 exim_gid = pw->pw_gid;
1571 #ifndef EXIM_GROUPNAME
1574 "exim: ref:name should specify a usercode, not a group.\n"
1575 "exim: can't let you get away with it unless you also specify a group.\n");
1579 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1582 #ifdef EXIM_GROUPNAME
1583 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1584 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1587 #ifdef CONFIGURE_OWNERNAME
1588 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1589 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1590 CONFIGURE_OWNERNAME);
1593 /* We default the system_filter_user to be the Exim run-time user, as a
1594 sane non-root value. */
1595 system_filter_uid = exim_uid;
1597 #ifdef CONFIGURE_GROUPNAME
1598 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1599 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1600 CONFIGURE_GROUPNAME);
1603 /* In the Cygwin environment, some initialization used to need doing.
1604 It was fudged in by means of this macro; now no longer but we'll leave
1605 it in case of others. */
1611 /* Check a field which is patched when we are running Exim within its
1612 testing harness; do a fast initial check, and then the whole thing. */
1614 f.running_in_test_harness =
1615 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1616 if (f.running_in_test_harness)
1619 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1620 at the start of a program; however, it seems that some environments do not
1621 follow this. A "strange" locale can affect the formatting of timestamps, so we
1624 setlocale(LC_ALL, "C");
1626 /* Set up the default handler for timing using alarm(). */
1628 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1630 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1631 because store_malloc writes a log entry on failure. */
1633 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1634 exim_fail("exim: failed to get store for log buffer\n");
1636 /* Initialize the default log options. */
1638 bits_set(log_selector, log_selector_size, log_default);
1640 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1641 NULL when the daemon is run and the file is closed. We have to use this
1642 indirection, because some systems don't allow writing to the variable "stderr".
1645 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1647 /* Arrange for the PCRE regex library to use our store functions. Note that
1648 the normal calls are actually macros that add additional arguments for
1649 debugging purposes so we have to assign specially constructed functions here.
1650 The default is to use store in the stacking pool, but this is overridden in the
1651 regex_must_compile() function. */
1653 pcre_malloc = function_store_get;
1654 pcre_free = function_dummy_free;
1656 /* Ensure there is a big buffer for temporary use in several places. It is put
1657 in malloc store so that it can be freed for enlargement if necessary. */
1659 big_buffer = store_malloc(big_buffer_size);
1661 /* Set up the handler for the data request signal, and set the initial
1662 descriptive text. */
1664 set_process_info("initializing");
1665 os_restarting_signal(SIGUSR1, usr1_handler);
1667 /* If running in a dockerized environment, the TERM signal is only
1668 delegated to the PID 1 if we request it by setting an signal handler */
1669 if (getpid() == 1) signal(SIGTERM, term_handler);
1671 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1672 in the daemon code. For the rest of Exim's uses, we ignore it. */
1674 signal(SIGHUP, SIG_IGN);
1676 /* We don't want to die on pipe errors as the code is written to handle
1677 the write error instead. */
1679 signal(SIGPIPE, SIG_IGN);
1681 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1682 set to SIG_IGN. This causes subprocesses that complete before the parent
1683 process waits for them not to hang around, so when Exim calls wait(), nothing
1684 is there. The wait() code has been made robust against this, but let's ensure
1685 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1686 ending status. We use sigaction rather than plain signal() on those OS where
1687 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1688 problem on AIX with this.) */
1692 struct sigaction act;
1693 act.sa_handler = SIG_DFL;
1694 sigemptyset(&(act.sa_mask));
1696 sigaction(SIGCHLD, &act, NULL);
1699 signal(SIGCHLD, SIG_DFL);
1702 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1707 /* Set up the version number. Set up the leading 'E' for the external form of
1708 message ids, set the pointer to the internal form, and initialize it to
1709 indicate no message being processed. */
1712 message_id_option[0] = '-';
1713 message_id_external = message_id_option + 1;
1714 message_id_external[0] = 'E';
1715 message_id = message_id_external + 1;
1718 /* Set the umask to zero so that any files Exim creates using open() are
1719 created with the modes that it specifies. NOTE: Files created with fopen() have
1720 a problem, which was not recognized till rather late (February 2006). With this
1721 umask, such files will be world writeable. (They are all content scanning files
1722 in the spool directory, which isn't world-accessible, so this is not a
1723 disaster, but it's untidy.) I don't want to change this overall setting,
1724 however, because it will interact badly with the open() calls. Instead, there's
1725 now a function called modefopen() that fiddles with the umask while calling
1730 /* Precompile the regular expression for matching a message id. Keep this in
1731 step with the code that generates ids in the accept.c module. We need to do
1732 this here, because the -M options check their arguments for syntactic validity
1733 using mac_ismsgid, which uses this. */
1736 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1738 /* Precompile the regular expression that is used for matching an SMTP error
1739 code, possibly extended, at the start of an error message. Note that the
1740 terminating whitespace character is included. */
1743 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1746 #ifdef WHITELIST_D_MACROS
1747 /* Precompile the regular expression used to filter the content of macros
1748 given to -D for permissibility. */
1750 regex_whitelisted_macro =
1751 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1754 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1756 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1757 this seems to be a generally accepted convention, since one finds symbolic
1758 links called "mailq" in standard OS configurations. */
1760 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1761 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1764 receiving_message = FALSE;
1765 called_as = US"-mailq";
1768 /* If the program is called as "rmail" treat it as equivalent to
1769 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1770 i.e. preventing a single dot on a line from terminating the message, and
1771 returning with zero return code, even in cases of error (provided an error
1772 message has been sent). */
1774 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1775 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1778 called_as = US"-rmail";
1779 errors_sender_rc = EXIT_SUCCESS;
1782 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1783 this is a smail convention. */
1785 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1786 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1788 smtp_input = smtp_batched_input = TRUE;
1789 called_as = US"-rsmtp";
1792 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1793 this is a smail convention. */
1795 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1796 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1799 receiving_message = FALSE;
1800 called_as = US"-runq";
1803 /* If the program is called as "newaliases" treat it as equivalent to
1804 "exim -bi"; this is a sendmail convention. */
1806 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1807 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1810 receiving_message = FALSE;
1811 called_as = US"-newaliases";
1814 /* Save the original effective uid for a couple of uses later. It should
1815 normally be root, but in some esoteric environments it may not be. */
1817 original_euid = geteuid();
1818 original_egid = getegid();
1820 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1821 to be the same as the real ones. This makes a difference only if Exim is setuid
1822 (or setgid) to something other than root, which could be the case in some
1823 special configurations. */
1825 real_uid = getuid();
1826 real_gid = getgid();
1828 if (real_uid == root_uid)
1830 if ((rv = setgid(real_gid)))
1831 exim_fail("exim: setgid(%ld) failed: %s\n",
1832 (long int)real_gid, strerror(errno));
1833 if ((rv = setuid(real_uid)))
1834 exim_fail("exim: setuid(%ld) failed: %s\n",
1835 (long int)real_uid, strerror(errno));
1838 /* If neither the original real uid nor the original euid was root, Exim is
1839 running in an unprivileged state. */
1841 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1843 /* Scan the program's arguments. Some can be dealt with right away; others are
1844 simply recorded for checking and handling afterwards. Do a high-level switch
1845 on the second character (the one after '-'), to save some effort. */
1847 for (i = 1; i < argc; i++)
1849 BOOL badarg = FALSE;
1850 uschar *arg = argv[i];
1854 /* An argument not starting with '-' is the start of a recipients list;
1855 break out of the options-scanning loop. */
1863 /* An option consisting of -- terminates the options */
1865 if (Ustrcmp(arg, "--") == 0)
1867 recipients_arg = i + 1;
1871 /* Handle flagged options */
1873 switchchar = arg[1];
1876 /* Make all -ex options synonymous with -oex arguments, since that
1877 is assumed by various callers. Also make -qR options synonymous with -R
1878 options, as that seems to be required as well. Allow for -qqR too, and
1879 the same for -S options. */
1881 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1882 Ustrncmp(arg+1, "qR", 2) == 0 ||
1883 Ustrncmp(arg+1, "qS", 2) == 0)
1885 switchchar = arg[2];
1888 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1890 switchchar = arg[3];
1892 f.queue_2stage = TRUE;
1895 /* Make -r synonymous with -f, since it is a documented alias */
1897 else if (arg[1] == 'r') switchchar = 'f';
1899 /* Make -ov synonymous with -v */
1901 else if (Ustrcmp(arg, "-ov") == 0)
1907 /* deal with --option_aliases */
1908 else if (switchchar == '-')
1910 if (Ustrcmp(argrest, "help") == 0)
1912 usage_wanted = TRUE;
1915 else if (Ustrcmp(argrest, "version") == 0)
1922 /* High-level switch on active initial letter */
1927 /* sendmail uses -Ac and -Am to control which .cf file is used;
1930 if (*argrest == '\0') { badarg = TRUE; break; }
1933 BOOL ignore = FALSE;
1938 if (*(argrest + 1) == '\0')
1942 if (!ignore) { badarg = TRUE; break; }
1946 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1947 so has no need of it. */
1950 if (*argrest == 0) i++; /* Skip over the type */
1955 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1957 /* -bd: Run in daemon mode, awaiting SMTP connections.
1958 -bdf: Ditto, but in the foreground.
1961 if (*argrest == 'd')
1963 f.daemon_listen = TRUE;
1964 if (*(++argrest) == 'f') f.background_daemon = FALSE;
1965 else if (*argrest != 0) { badarg = TRUE; break; }
1968 /* -be: Run in expansion test mode
1969 -bem: Ditto, but read a message from a file first
1972 else if (*argrest == 'e')
1974 expansion_test = checking = TRUE;
1975 if (argrest[1] == 'm')
1977 if (++i >= argc) { badarg = TRUE; break; }
1978 expansion_test_message = argv[i];
1981 if (argrest[1] != 0) { badarg = TRUE; break; }
1984 /* -bF: Run system filter test */
1986 else if (*argrest == 'F')
1988 filter_test |= checking = FTEST_SYSTEM;
1989 if (*(++argrest) != 0) { badarg = TRUE; break; }
1990 if (++i < argc) filter_test_sfile = argv[i]; else
1991 exim_fail("exim: file name expected after %s\n", argv[i-1]);
1994 /* -bf: Run user filter test
1995 -bfd: Set domain for filter testing
1996 -bfl: Set local part for filter testing
1997 -bfp: Set prefix for filter testing
1998 -bfs: Set suffix for filter testing
2001 else if (*argrest == 'f')
2003 if (*(++argrest) == 0)
2005 filter_test |= checking = FTEST_USER;
2006 if (++i < argc) filter_test_ufile = argv[i]; else
2007 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2012 exim_fail("exim: string expected after %s\n", arg);
2013 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2014 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2015 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2016 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2017 else { badarg = TRUE; break; }
2021 /* -bh: Host checking - an IP address must follow. */
2023 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2025 if (++i >= argc) { badarg = TRUE; break; }
2026 sender_host_address = argv[i];
2027 host_checking = checking = f.log_testing_mode = TRUE;
2028 f.host_checking_callout = argrest[1] == 'c';
2029 message_logs = FALSE;
2032 /* -bi: This option is used by sendmail to initialize *the* alias file,
2033 though it has the -oA option to specify a different file. Exim has no
2034 concept of *the* alias file, but since Sun's YP make script calls
2035 sendmail this way, some support must be provided. */
2037 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2039 /* -bI: provide information, of the type to follow after a colon.
2040 This is an Exim flag. */
2042 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2044 uschar *p = &argrest[2];
2045 info_flag = CMDINFO_HELP;
2048 if (strcmpic(p, CUS"sieve") == 0)
2050 info_flag = CMDINFO_SIEVE;
2053 else if (strcmpic(p, CUS"dscp") == 0)
2055 info_flag = CMDINFO_DSCP;
2058 else if (strcmpic(p, CUS"help") == 0)
2065 /* -bm: Accept and deliver message - the default option. Reinstate
2066 receiving_message, which got turned off for all -b options. */
2068 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2070 /* -bmalware: test the filename given for malware */
2072 else if (Ustrcmp(argrest, "malware") == 0)
2074 if (++i >= argc) { badarg = TRUE; break; }
2076 malware_test_file = argv[i];
2079 /* -bnq: For locally originating messages, do not qualify unqualified
2080 addresses. In the envelope, this causes errors; in header lines they
2083 else if (Ustrcmp(argrest, "nq") == 0)
2085 f.allow_unqualified_sender = FALSE;
2086 f.allow_unqualified_recipient = FALSE;
2089 /* -bpxx: List the contents of the mail queue, in various forms. If
2090 the option is -bpc, just a queue count is needed. Otherwise, if the
2091 first letter after p is r, then order is random. */
2093 else if (*argrest == 'p')
2095 if (*(++argrest) == 'c')
2098 if (*(++argrest) != 0) badarg = TRUE;
2102 if (*argrest == 'r')
2104 list_queue_option = 8;
2107 else list_queue_option = 0;
2111 /* -bp: List the contents of the mail queue, top-level only */
2113 if (*argrest == 0) {}
2115 /* -bpu: List the contents of the mail queue, top-level undelivered */
2117 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2119 /* -bpa: List the contents of the mail queue, including all delivered */
2121 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2123 /* Unknown after -bp[r] */
2133 /* -bP: List the configuration variables given as the address list.
2134 Force -v, so configuration errors get displayed. */
2136 else if (Ustrcmp(argrest, "P") == 0)
2138 /* -bP config: we need to setup here, because later,
2139 * when list_options is checked, the config is read already */
2140 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2143 readconf_save_config(version_string);
2147 list_options = TRUE;
2148 debug_selector |= D_v;
2149 debug_file = stderr;
2153 /* -brt: Test retry configuration lookup */
2155 else if (Ustrcmp(argrest, "rt") == 0)
2158 test_retry_arg = i + 1;
2162 /* -brw: Test rewrite configuration */
2164 else if (Ustrcmp(argrest, "rw") == 0)
2167 test_rewrite_arg = i + 1;
2171 /* -bS: Read SMTP commands on standard input, but produce no replies -
2172 all errors are reported by sending messages. */
2174 else if (Ustrcmp(argrest, "S") == 0)
2175 smtp_input = smtp_batched_input = receiving_message = TRUE;
2177 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2178 on standard output. */
2180 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2182 /* -bt: address testing mode */
2184 else if (Ustrcmp(argrest, "t") == 0)
2185 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2187 /* -bv: verify addresses */
2189 else if (Ustrcmp(argrest, "v") == 0)
2190 verify_address_mode = checking = f.log_testing_mode = TRUE;
2192 /* -bvs: verify sender addresses */
2194 else if (Ustrcmp(argrest, "vs") == 0)
2196 verify_address_mode = checking = f.log_testing_mode = TRUE;
2197 verify_as_sender = TRUE;
2200 /* -bV: Print version string and support details */
2202 else if (Ustrcmp(argrest, "V") == 0)
2204 printf("Exim version %s #%s built %s\n", version_string,
2205 version_cnumber, version_date);
2206 printf("%s\n", CS version_copyright);
2207 version_printed = TRUE;
2208 show_whats_supported(stdout);
2209 f.log_testing_mode = TRUE;
2212 /* -bw: inetd wait mode, accept a listening socket as stdin */
2214 else if (*argrest == 'w')
2216 f.inetd_wait_mode = TRUE;
2217 f.background_daemon = FALSE;
2218 f.daemon_listen = TRUE;
2219 if (*(++argrest) != '\0')
2220 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2221 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2228 /* -C: change configuration file list; ignore if it isn't really
2229 a change! Enforce a prefix check if required. */
2234 if(++i < argc) argrest = argv[i]; else
2235 { badarg = TRUE; break; }
2237 if (Ustrcmp(config_main_filelist, argrest) != 0)
2239 #ifdef ALT_CONFIG_PREFIX
2241 int len = Ustrlen(ALT_CONFIG_PREFIX);
2242 const uschar *list = argrest;
2244 while((filename = string_nextinlist(&list, &sep, big_buffer,
2245 big_buffer_size)) != NULL)
2247 if ((Ustrlen(filename) < len ||
2248 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2249 Ustrstr(filename, "/../") != NULL) &&
2250 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2251 exim_fail("-C Permission denied\n");
2254 if (real_uid != root_uid)
2256 #ifdef TRUSTED_CONFIG_LIST
2258 if (real_uid != exim_uid
2259 #ifdef CONFIGURE_OWNER
2260 && real_uid != config_uid
2263 f.trusted_config = FALSE;
2266 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2269 struct stat statbuf;
2271 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2272 (statbuf.st_uid != root_uid /* owner not root */
2273 #ifdef CONFIGURE_OWNER
2274 && statbuf.st_uid != config_uid /* owner not the special one */
2277 (statbuf.st_gid != root_gid /* group not root */
2278 #ifdef CONFIGURE_GROUP
2279 && statbuf.st_gid != config_gid /* group not the special one */
2281 && (statbuf.st_mode & 020) != 0 /* group writeable */
2283 (statbuf.st_mode & 2) != 0) /* world writeable */
2285 f.trusted_config = FALSE;
2290 /* Well, the trust list at least is up to scratch... */
2291 void *reset_point = store_get(0);
2292 uschar *trusted_configs[32];
2296 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2298 uschar *start = big_buffer, *nl;
2299 while (*start && isspace(*start))
2303 nl = Ustrchr(start, '\n');
2306 trusted_configs[nr_configs++] = string_copy(start);
2307 if (nr_configs == 32)
2315 const uschar *list = argrest;
2317 while (f.trusted_config && (filename = string_nextinlist(&list,
2318 &sep, big_buffer, big_buffer_size)) != NULL)
2320 for (i=0; i < nr_configs; i++)
2322 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2325 if (i == nr_configs)
2327 f.trusted_config = FALSE;
2331 store_reset(reset_point);
2335 /* No valid prefixes found in trust_list file. */
2336 f.trusted_config = FALSE;
2342 /* Could not open trust_list file. */
2343 f.trusted_config = FALSE;
2347 /* Not root; don't trust config */
2348 f.trusted_config = FALSE;
2352 config_main_filelist = argrest;
2353 f.config_changed = TRUE;
2358 /* -D: set up a macro definition */
2361 #ifdef DISABLE_D_OPTION
2362 exim_fail("exim: -D is not available in this Exim binary\n");
2368 uschar *s = argrest;
2371 while (isspace(*s)) s++;
2373 if (*s < 'A' || *s > 'Z')
2374 exim_fail("exim: macro name set by -D must start with "
2375 "an upper case letter\n");
2377 while (isalnum(*s) || *s == '_')
2379 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2383 if (ptr == 0) { badarg = TRUE; break; }
2384 while (isspace(*s)) s++;
2387 if (*s++ != '=') { badarg = TRUE; break; }
2388 while (isspace(*s)) s++;
2391 for (m = macros_user; m; m = m->next)
2392 if (Ustrcmp(m->name, name) == 0)
2393 exim_fail("exim: duplicated -D in command line\n");
2395 m = macro_create(name, s, TRUE);
2397 if (clmacro_count >= MAX_CLMACROS)
2398 exim_fail("exim: too many -D options on command line\n");
2399 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2405 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2406 The latter is now a no-op, retained for compatibility only. If -dd is used,
2407 debugging subprocesses of the daemon is disabled. */
2410 if (Ustrcmp(argrest, "ropcr") == 0)
2412 /* drop_cr = TRUE; */
2415 /* Use an intermediate variable so that we don't set debugging while
2416 decoding the debugging bits. */
2420 unsigned int selector = D_default;
2423 if (*argrest == 'd')
2425 f.debug_daemon = TRUE;
2429 decode_bits(&selector, 1, debug_notall, argrest,
2430 debug_options, debug_options_count, US"debug", 0);
2431 debug_selector = selector;
2436 /* -E: This is a local error message. This option is not intended for
2437 external use at all, but is not restricted to trusted callers because it
2438 does no harm (just suppresses certain error messages) and if Exim is run
2439 not setuid root it won't always be trusted when it generates error
2440 messages using this option. If there is a message id following -E, point
2441 message_reference at it, for logging. */
2444 f.local_error_message = TRUE;
2445 if (mac_ismsgid(argrest)) message_reference = argrest;
2449 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2450 option, so it looks as if historically the -oex options are also callable
2451 without the leading -o. So we have to accept them. Before the switch,
2452 anything starting -oe has been converted to -e. Exim does not support all
2453 of the sendmail error options. */
2456 if (Ustrcmp(argrest, "e") == 0)
2458 arg_error_handling = ERRORS_SENDER;
2459 errors_sender_rc = EXIT_SUCCESS;
2461 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2462 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2463 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2464 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2469 /* -F: Set sender's full name, used instead of the gecos entry from
2470 the password file. Since users can usually alter their gecos entries,
2471 there's no security involved in using this instead. The data can follow
2472 the -F or be in the next argument. */
2477 if(++i < argc) argrest = argv[i]; else
2478 { badarg = TRUE; break; }
2480 originator_name = argrest;
2481 f.sender_name_forced = TRUE;
2485 /* -f: Set sender's address - this value is only actually used if Exim is
2486 run by a trusted user, or if untrusted_set_sender is set and matches the
2487 address, except that the null address can always be set by any user. The
2488 test for this happens later, when the value given here is ignored when not
2489 permitted. For an untrusted user, the actual sender is still put in Sender:
2490 if it doesn't match the From: header (unless no_local_from_check is set).
2491 The data can follow the -f or be in the next argument. The -r switch is an
2492 obsolete form of -f but since there appear to be programs out there that
2493 use anything that sendmail has ever supported, better accept it - the
2494 synonymizing is done before the switch above.
2496 At this stage, we must allow domain literal addresses, because we don't
2497 know what the setting of allow_domain_literals is yet. Ditto for trailing
2498 dots and strip_trailing_dot. */
2502 int dummy_start, dummy_end;
2506 if (i+1 < argc) argrest = argv[++i]; else
2507 { badarg = TRUE; break; }
2510 sender_address = string_sprintf(""); /* Ensure writeable memory */
2513 uschar *temp = argrest + Ustrlen(argrest) - 1;
2514 while (temp >= argrest && isspace(*temp)) temp--;
2515 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2516 allow_domain_literals = TRUE;
2517 strip_trailing_dot = TRUE;
2519 allow_utf8_domains = TRUE;
2521 sender_address = parse_extract_address(argrest, &errmess,
2522 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2524 message_smtputf8 = string_is_utf8(sender_address);
2525 allow_utf8_domains = FALSE;
2527 allow_domain_literals = FALSE;
2528 strip_trailing_dot = FALSE;
2529 if (!sender_address)
2530 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2532 f.sender_address_forced = TRUE;
2536 /* -G: sendmail invocation to specify that it's a gateway submission and
2537 sendmail may complain about problems instead of fixing them.
2538 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2539 not at this time complain about problems. */
2545 /* -h: Set the hop count for an incoming message. Exim does not currently
2546 support this; it always computes it by counting the Received: headers.
2547 To put it in will require a change to the spool header file format. */
2552 if(++i < argc) argrest = argv[i]; else
2553 { badarg = TRUE; break; }
2555 if (!isdigit(*argrest)) badarg = TRUE;
2559 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2560 not to be documented for sendmail but mailx (at least) uses it) */
2563 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2567 /* -L: set the identifier used for syslog; equivalent to setting
2568 syslog_processname in the config file, but needs to be an admin option. */
2571 if (*argrest == '\0')
2573 if(++i < argc) argrest = argv[i]; else
2574 { badarg = TRUE; break; }
2576 if ((sz = Ustrlen(argrest)) > 32)
2577 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2579 exim_fail("exim: the -L syslog name is too short\n");
2580 cmdline_syslog_name = argrest;
2584 receiving_message = FALSE;
2586 /* -MC: continue delivery of another message via an existing open
2587 file descriptor. This option is used for an internal call by the
2588 smtp transport when there is a pending message waiting to go to an
2589 address to which it has got a connection. Five subsequent arguments are
2590 required: transport name, host name, IP address, sequence number, and
2591 message_id. Transports may decline to create new processes if the sequence
2592 number gets too big. The channel is stdin. This (-MC) must be the last
2593 argument. There's a subsequent check that the real-uid is privileged.
2595 If we are running in the test harness. delay for a bit, to let the process
2596 that set this one up complete. This makes for repeatability of the logging,
2599 if (Ustrcmp(argrest, "C") == 0)
2601 union sockaddr_46 interface_sock;
2602 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2605 exim_fail("exim: too many or too few arguments after -MC\n");
2607 if (msg_action_arg >= 0)
2608 exim_fail("exim: incompatible arguments\n");
2610 continue_transport = argv[++i];
2611 continue_hostname = argv[++i];
2612 continue_host_address = argv[++i];
2613 continue_sequence = Uatoi(argv[++i]);
2614 msg_action = MSG_DELIVER;
2615 msg_action_arg = ++i;
2616 forced_delivery = TRUE;
2617 queue_run_pid = passed_qr_pid;
2618 queue_run_pipe = passed_qr_pipe;
2620 if (!mac_ismsgid(argv[i]))
2621 exim_fail("exim: malformed message id %s after -MC option\n",
2624 /* Set up $sending_ip_address and $sending_port, unless proxied */
2626 if (!continue_proxy_cipher)
2627 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2629 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2632 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2635 if (f.running_in_test_harness) millisleep(500);
2639 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2643 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2644 precedes -MC (see above). The flag indicates that the host to which
2645 Exim is connected has accepted an AUTH sequence. */
2647 case 'A': f.smtp_authenticated = TRUE; break;
2649 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2650 that exim is connected to supports the esmtp extension DSN */
2652 case 'D': smtp_peer_options |= OPTION_DSN; break;
2654 /* -MCG: set the queue name, to a non-default value */
2656 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2660 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2662 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2664 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2665 it preceded -MC (see above) */
2667 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2669 /* -MCQ: pass on the pid of the queue-running process that started
2670 this chain of deliveries and the fd of its synchronizing pipe; this
2671 is useful only when it precedes -MC (see above) */
2673 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2675 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2679 /* -MCS: set the smtp_use_size flag; this is useful only when it
2680 precedes -MC (see above) */
2682 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2685 /* -MCt: similar to -MCT below but the connection is still open
2686 via a proxy process which handles the TLS context and coding.
2687 Require three arguments for the proxied local address and port,
2688 and the TLS cipher. */
2690 case 't': if (++i < argc) sending_ip_address = argv[i];
2692 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2694 if (++i < argc) continue_proxy_cipher = argv[i];
2698 /* -MCT: set the tls_offered flag; this is useful only when it
2699 precedes -MC (see above). The flag indicates that the host to which
2700 Exim is connected has offered TLS support. */
2702 case 'T': smtp_peer_options |= OPTION_TLS; break;
2705 default: badarg = TRUE; break;
2710 /* -M[x]: various operations on the following list of message ids:
2711 -M deliver the messages, ignoring next retry times and thawing
2712 -Mc deliver the messages, checking next retry times, no thawing
2713 -Mf freeze the messages
2714 -Mg give up on the messages
2715 -Mt thaw the messages
2716 -Mrm remove the messages
2717 In the above cases, this must be the last option. There are also the
2718 following options which are followed by a single message id, and which
2719 act on that message. Some of them use the "recipient" addresses as well.
2720 -Mar add recipient(s)
2721 -Mmad mark all recipients delivered
2722 -Mmd mark recipients(s) delivered
2724 -Mset load a message for use with -be
2726 -Mvc show copy (of whole message, in RFC 2822 format)
2731 else if (*argrest == 0)
2733 msg_action = MSG_DELIVER;
2734 forced_delivery = f.deliver_force_thaw = TRUE;
2736 else if (Ustrcmp(argrest, "ar") == 0)
2738 msg_action = MSG_ADD_RECIPIENT;
2739 one_msg_action = TRUE;
2741 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2742 else if (Ustrcmp(argrest, "es") == 0)
2744 msg_action = MSG_EDIT_SENDER;
2745 one_msg_action = TRUE;
2747 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2748 else if (Ustrcmp(argrest, "g") == 0)
2750 msg_action = MSG_DELIVER;
2751 deliver_give_up = TRUE;
2753 else if (Ustrcmp(argrest, "mad") == 0)
2755 msg_action = MSG_MARK_ALL_DELIVERED;
2757 else if (Ustrcmp(argrest, "md") == 0)
2759 msg_action = MSG_MARK_DELIVERED;
2760 one_msg_action = TRUE;
2762 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2763 else if (Ustrcmp(argrest, "set") == 0)
2765 msg_action = MSG_LOAD;
2766 one_msg_action = TRUE;
2768 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2769 else if (Ustrcmp(argrest, "vb") == 0)
2771 msg_action = MSG_SHOW_BODY;
2772 one_msg_action = TRUE;
2774 else if (Ustrcmp(argrest, "vc") == 0)
2776 msg_action = MSG_SHOW_COPY;
2777 one_msg_action = TRUE;
2779 else if (Ustrcmp(argrest, "vh") == 0)
2781 msg_action = MSG_SHOW_HEADER;
2782 one_msg_action = TRUE;
2784 else if (Ustrcmp(argrest, "vl") == 0)
2786 msg_action = MSG_SHOW_LOG;
2787 one_msg_action = TRUE;
2789 else { badarg = TRUE; break; }
2791 /* All the -Mxx options require at least one message id. */
2793 msg_action_arg = i + 1;
2794 if (msg_action_arg >= argc)
2795 exim_fail("exim: no message ids given after %s option\n", arg);
2797 /* Some require only message ids to follow */
2799 if (!one_msg_action)
2801 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2802 exim_fail("exim: malformed message id %s after %s option\n",
2804 goto END_ARG; /* Remaining args are ids */
2807 /* Others require only one message id, possibly followed by addresses,
2808 which will be handled as normal arguments. */
2812 if (!mac_ismsgid(argv[msg_action_arg]))
2813 exim_fail("exim: malformed message id %s after %s option\n",
2814 argv[msg_action_arg], arg);
2820 /* Some programs seem to call the -om option without the leading o;
2821 for sendmail it askes for "me too". Exim always does this. */
2824 if (*argrest != 0) badarg = TRUE;
2828 /* -N: don't do delivery - a debugging option that stops transports doing
2829 their thing. It implies debugging at the D_v level. */
2834 f.dont_deliver = TRUE;
2835 debug_selector |= D_v;
2836 debug_file = stderr;
2842 /* -n: This means "don't alias" in sendmail, apparently.
2843 For normal invocations, it has no effect.
2844 It may affect some other options. */
2850 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2851 option to the specified value. This form uses long names. We need to handle
2852 -O option=value and -Ooption=value. */
2858 exim_fail("exim: string expected after -O\n");
2864 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2867 if (*argrest == 'A')
2869 alias_arg = argrest + 1;
2870 if (alias_arg[0] == 0)
2872 if (i+1 < argc) alias_arg = argv[++i]; else
2873 exim_fail("exim: string expected after -oA\n");
2877 /* -oB: Set a connection message max value for remote deliveries */
2879 else if (*argrest == 'B')
2881 uschar *p = argrest + 1;
2884 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2886 connection_max_messages = 1;
2894 exim_fail("exim: number expected after -oB\n");
2895 connection_max_messages = Uatoi(p);
2899 /* -odb: background delivery */
2901 else if (Ustrcmp(argrest, "db") == 0)
2903 f.synchronous_delivery = FALSE;
2904 arg_queue_only = FALSE;
2905 queue_only_set = TRUE;
2908 /* -odf: foreground delivery (smail-compatible option); same effect as
2909 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2912 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2914 f.synchronous_delivery = TRUE;
2915 arg_queue_only = FALSE;
2916 queue_only_set = TRUE;
2919 /* -odq: queue only */
2921 else if (Ustrcmp(argrest, "dq") == 0)
2923 f.synchronous_delivery = FALSE;
2924 arg_queue_only = TRUE;
2925 queue_only_set = TRUE;
2928 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2929 but no remote delivery */
2931 else if (Ustrcmp(argrest, "dqs") == 0)
2933 f.queue_smtp = TRUE;
2934 arg_queue_only = FALSE;
2935 queue_only_set = TRUE;
2938 /* -oex: Sendmail error flags. As these are also accepted without the
2939 leading -o prefix, for compatibility with vacation and other callers,
2940 they are handled with -e above. */
2942 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2943 -oitrue: Another sendmail syntax for the same */
2945 else if (Ustrcmp(argrest, "i") == 0 ||
2946 Ustrcmp(argrest, "itrue") == 0)
2949 /* -oM*: Set various characteristics for an incoming message; actually
2950 acted on for trusted callers only. */
2952 else if (*argrest == 'M')
2955 exim_fail("exim: data expected after -o%s\n", argrest);
2957 /* -oMa: Set sender host address */
2959 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2961 /* -oMaa: Set authenticator name */
2963 else if (Ustrcmp(argrest, "Maa") == 0)
2964 sender_host_authenticated = argv[++i];
2966 /* -oMas: setting authenticated sender */
2968 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2970 /* -oMai: setting authenticated id */
2972 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2974 /* -oMi: Set incoming interface address */
2976 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2978 /* -oMm: Message reference */
2980 else if (Ustrcmp(argrest, "Mm") == 0)
2982 if (!mac_ismsgid(argv[i+1]))
2983 exim_fail("-oMm must be a valid message ID\n");
2984 if (!f.trusted_config)
2985 exim_fail("-oMm must be called by a trusted user/config\n");
2986 message_reference = argv[++i];
2989 /* -oMr: Received protocol */
2991 else if (Ustrcmp(argrest, "Mr") == 0)
2993 if (received_protocol)
2994 exim_fail("received_protocol is set already\n");
2996 received_protocol = argv[++i];
2998 /* -oMs: Set sender host name */
3000 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3002 /* -oMt: Set sender ident */
3004 else if (Ustrcmp(argrest, "Mt") == 0)
3006 sender_ident_set = TRUE;
3007 sender_ident = argv[++i];
3010 /* Else a bad argument */
3019 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3020 seem to call this as -m (undocumented), so that is also accepted (see
3023 else if (Ustrcmp(argrest, "m") == 0) {}
3025 /* -oo: An ancient flag for old-style addresses which still seems to
3026 crop up in some calls (see in SCO). */
3028 else if (Ustrcmp(argrest, "o") == 0) {}
3030 /* -oP <name>: set pid file path for daemon */
3032 else if (Ustrcmp(argrest, "P") == 0)
3033 override_pid_file_path = argv[++i];
3035 /* -or <n>: set timeout for non-SMTP acceptance
3036 -os <n>: set timeout for SMTP acceptance */
3038 else if (*argrest == 'r' || *argrest == 's')
3040 int *tp = (*argrest == 'r')?
3041 &arg_receive_timeout : &arg_smtp_receive_timeout;
3042 if (argrest[1] == 0)
3044 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3046 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3048 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3051 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3053 else if (Ustrcmp(argrest, "X") == 0)
3054 override_local_interfaces = argv[++i];
3056 /* Unknown -o argument */
3062 /* -ps: force Perl startup; -pd force delayed Perl startup */
3066 if (*argrest == 's' && argrest[1] == 0)
3068 perl_start_option = 1;
3071 if (*argrest == 'd' && argrest[1] == 0)
3073 perl_start_option = -1;
3078 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3079 which sets the host protocol and host name */
3083 argrest = argv[++i];
3085 { badarg = TRUE; break; }
3091 if (received_protocol)
3092 exim_fail("received_protocol is set already\n");
3094 hn = Ustrchr(argrest, ':');
3096 received_protocol = argrest;
3099 int old_pool = store_pool;
3100 store_pool = POOL_PERM;
3101 received_protocol = string_copyn(argrest, hn - argrest);
3102 store_pool = old_pool;
3103 sender_host_name = hn + 1;
3110 receiving_message = FALSE;
3111 if (queue_interval >= 0)
3112 exim_fail("exim: -q specified more than once\n");
3114 /* -qq...: Do queue runs in a 2-stage manner */
3116 if (*argrest == 'q')
3118 f.queue_2stage = TRUE;
3122 /* -qi...: Do only first (initial) deliveries */
3124 if (*argrest == 'i')
3126 f.queue_run_first_delivery = TRUE;
3130 /* -qf...: Run the queue, forcing deliveries
3131 -qff..: Ditto, forcing thawing as well */
3133 if (*argrest == 'f')
3135 f.queue_run_force = TRUE;
3136 if (*++argrest == 'f')
3138 f.deliver_force_thaw = TRUE;
3143 /* -q[f][f]l...: Run the queue only on local deliveries */
3145 if (*argrest == 'l')
3147 f.queue_run_local = TRUE;
3151 /* -q[f][f][l][G<name>]... Work on the named queue */
3153 if (*argrest == 'G')
3156 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3157 queue_name = string_copyn(argrest, i);
3159 if (*argrest == '/') argrest++;
3162 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3163 only, optionally named, optionally starting from a given message id. */
3165 if (*argrest == 0 &&
3166 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3169 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3170 start_queue_run_id = argv[++i];
3171 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3172 stop_queue_run_id = argv[++i];
3175 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3176 forced, optionally local only, optionally named. */
3178 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3180 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3184 case 'R': /* Synonymous with -qR... */
3185 receiving_message = FALSE;
3187 /* -Rf: As -R (below) but force all deliveries,
3188 -Rff: Ditto, but also thaw all frozen messages,
3189 -Rr: String is regex
3190 -Rrf: Regex and force
3191 -Rrff: Regex and force and thaw
3193 in all cases provided there are no further characters in this
3197 for (int i = 0; i < nelem(rsopts); i++)
3198 if (Ustrcmp(argrest, rsopts[i]) == 0)
3200 if (i != 2) f.queue_run_force = TRUE;
3201 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3202 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3203 argrest += Ustrlen(rsopts[i]);
3206 /* -R: Set string to match in addresses for forced queue run to
3207 pick out particular messages. */
3210 deliver_selectstring = argrest;
3211 else if (i+1 < argc)
3212 deliver_selectstring = argv[++i];
3214 exim_fail("exim: string expected after -R\n");
3218 /* -r: an obsolete synonym for -f (see above) */
3221 /* -S: Like -R but works on sender. */
3223 case 'S': /* Synonymous with -qS... */
3224 receiving_message = FALSE;
3226 /* -Sf: As -S (below) but force all deliveries,
3227 -Sff: Ditto, but also thaw all frozen messages,
3228 -Sr: String is regex
3229 -Srf: Regex and force
3230 -Srff: Regex and force and thaw
3232 in all cases provided there are no further characters in this
3236 for (int i = 0; i < nelem(rsopts); i++)
3237 if (Ustrcmp(argrest, rsopts[i]) == 0)
3239 if (i != 2) f.queue_run_force = TRUE;
3240 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3241 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3242 argrest += Ustrlen(rsopts[i]);
3245 /* -S: Set string to match in addresses for forced queue run to
3246 pick out particular messages. */
3249 deliver_selectstring_sender = argrest;
3250 else if (i+1 < argc)
3251 deliver_selectstring_sender = argv[++i];
3253 exim_fail("exim: string expected after -S\n");
3256 /* -Tqt is an option that is exclusively for use by the testing suite.
3257 It is not recognized in other circumstances. It allows for the setting up
3258 of explicit "queue times" so that various warning/retry things can be
3259 tested. Otherwise variability of clock ticks etc. cause problems. */
3262 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3263 fudged_queue_times = argv[++i];
3268 /* -t: Set flag to extract recipients from body of message. */
3271 if (*argrest == 0) extract_recipients = TRUE;
3273 /* -ti: Set flag to extract recipients from body of message, and also
3274 specify that dot does not end the message. */
3276 else if (Ustrcmp(argrest, "i") == 0)
3278 extract_recipients = TRUE;
3282 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3285 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3292 /* -U: This means "initial user submission" in sendmail, apparently. The
3293 doc claims that in future sendmail may refuse syntactically invalid
3294 messages instead of fixing them. For the moment, we just ignore it. */
3300 /* -v: verify things - this is a very low-level debugging */
3305 debug_selector |= D_v;
3306 debug_file = stderr;
3312 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3314 The -x flag tells the sendmail command that mail from a local
3315 mail program has National Language Support (NLS) extended characters
3316 in the body of the mail item. The sendmail command can send mail with
3317 extended NLS characters across networks that normally corrupts these
3320 As Exim is 8-bit clean, it just ignores this flag. */
3323 if (*argrest != 0) badarg = TRUE;
3326 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3327 logs to that file. We swallow the parameter and otherwise ignore it. */
3330 if (*argrest == '\0')
3332 exim_fail("exim: string expected after -X\n");
3336 if (*argrest == '\0')
3338 log_oneline = argv[i];
3340 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3343 /* All other initial characters are errors */
3348 } /* End of high-level switch statement */
3350 /* Failed to recognize the option, or syntax error */
3353 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3354 "option %s\n", arg);
3358 /* If -R or -S have been specified without -q, assume a single queue run. */
3360 if ( (deliver_selectstring || deliver_selectstring_sender)
3361 && queue_interval < 0)
3366 /* If usage_wanted is set we call the usage function - which never returns */
3367 if (usage_wanted) exim_usage(called_as);
3369 /* Arguments have been processed. Check for incompatibilities. */
3371 (smtp_input || extract_recipients || recipients_arg < argc) &&
3372 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3373 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3374 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3377 msg_action_arg > 0 &&
3378 (f.daemon_listen || queue_interval > 0 || list_options ||
3379 (checking && msg_action != MSG_LOAD) ||
3380 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3383 (f.daemon_listen || queue_interval > 0) &&
3384 (sender_address != NULL || list_options || list_queue || checking ||
3388 f.daemon_listen && queue_interval == 0
3391 f.inetd_wait_mode && queue_interval >= 0
3395 (checking || smtp_input || extract_recipients ||
3396 filter_test != FTEST_NONE || bi_option)
3399 verify_address_mode &&
3400 (f.address_test_mode || smtp_input || extract_recipients ||
3401 filter_test != FTEST_NONE || bi_option)
3404 f.address_test_mode && (smtp_input || extract_recipients ||
3405 filter_test != FTEST_NONE || bi_option)
3408 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3412 deliver_selectstring != NULL && queue_interval < 0
3415 msg_action == MSG_LOAD &&
3416 (!expansion_test || expansion_test_message != NULL)
3419 exim_fail("exim: incompatible command-line options or arguments\n");
3421 /* If debugging is set up, set the file and the file descriptor to pass on to
3422 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3423 to run in the foreground. */
3425 if (debug_selector != 0)
3427 debug_file = stderr;
3428 debug_fd = fileno(debug_file);
3429 f.background_daemon = FALSE;
3430 if (f.running_in_test_harness) millisleep(100); /* lets caller finish */
3431 if (debug_selector != D_v) /* -v only doesn't show this */
3433 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3434 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3436 if (!version_printed)
3437 show_whats_supported(stderr);
3441 /* When started with root privilege, ensure that the limits on the number of
3442 open files and the number of processes (where that is accessible) are
3443 sufficiently large, or are unset, in case Exim has been called from an
3444 environment where the limits are screwed down. Not all OS have the ability to
3445 change some of these limits. */
3449 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3455 #ifdef RLIMIT_NOFILE
3456 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3458 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3460 rlp.rlim_cur = rlp.rlim_max = 0;
3463 /* I originally chose 1000 as a nice big number that was unlikely to
3464 be exceeded. It turns out that some older OS have a fixed upper limit of
3467 if (rlp.rlim_cur < 1000)
3469 rlp.rlim_cur = rlp.rlim_max = 1000;
3470 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3472 rlp.rlim_cur = rlp.rlim_max = 256;
3473 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3474 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3481 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3483 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3485 rlp.rlim_cur = rlp.rlim_max = 0;
3488 #ifdef RLIM_INFINITY
3489 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3491 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3493 if (rlp.rlim_cur < 1000)
3495 rlp.rlim_cur = rlp.rlim_max = 1000;
3497 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3498 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3504 /* Exim is normally entered as root (but some special configurations are
3505 possible that don't do this). However, it always spins off sub-processes that
3506 set their uid and gid as required for local delivery. We don't want to pass on
3507 any extra groups that root may belong to, so we want to get rid of them all at
3510 We need to obey setgroups() at this stage, before possibly giving up root
3511 privilege for a changed configuration file, but later on we might need to
3512 check on the additional groups for the admin user privilege - can't do that
3513 till after reading the config, which might specify the exim gid. Therefore,
3514 save the group list here first. */
3516 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3517 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3519 /* There is a fundamental difference in some BSD systems in the matter of
3520 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3521 known not to be different. On the "different" systems there is a single group
3522 list, and the first entry in it is the current group. On all other versions of
3523 Unix there is a supplementary group list, which is in *addition* to the current
3524 group. Consequently, to get rid of all extraneous groups on a "standard" system
3525 you pass over 0 groups to setgroups(), while on a "different" system you pass
3526 over a single group - the current group, which is always the first group in the
3527 list. Calling setgroups() with zero groups on a "different" system results in
3528 an error return. The following code should cope with both types of system.
3530 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3531 the "setgroups() with zero groups" - and changes the egid.
3532 Thanks to that we had to stash the original_egid above, for use below
3533 in the call to exim_setugid().
3535 However, if this process isn't running as root, setgroups() can't be used
3536 since you have to be root to run it, even if throwing away groups. Not being
3537 root here happens only in some unusual configurations. We just ignore the
3540 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0 && !unprivileged)
3541 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3543 /* If the configuration file name has been altered by an argument on the
3544 command line (either a new file name or a macro definition) and the caller is
3545 not root, or if this is a filter testing run, remove any setuid privilege the
3546 program has and run as the underlying user.
3548 The exim user is locked out of this, which severely restricts the use of -C
3551 Otherwise, set the real ids to the effective values (should be root unless run
3552 from inetd, which it can either be root or the exim uid, if one is configured).
3554 There is a private mechanism for bypassing some of this, in order to make it
3555 possible to test lots of configurations automatically, without having either to
3556 recompile each time, or to patch in an actual configuration file name and other
3557 values (such as the path name). If running in the test harness, pretend that
3558 configuration file changes and macro definitions haven't happened. */
3561 (!f.trusted_config || /* Config changed, or */
3562 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3563 real_uid != root_uid && /* Not root, and */
3564 !f.running_in_test_harness /* Not fudged */
3566 expansion_test /* expansion testing */
3568 filter_test != FTEST_NONE) /* Filter testing */
3570 setgroups(group_count, group_list);
3571 exim_setugid(real_uid, real_gid, FALSE,
3572 US"-C, -D, -be or -bf forces real uid");
3573 removed_privilege = TRUE;
3575 /* In the normal case when Exim is called like this, stderr is available
3576 and should be used for any logging information because attempts to write
3577 to the log will usually fail. To arrange this, we unset really_exim. However,
3578 if no stderr is available there is no point - we might as well have a go
3579 at the log (if it fails, syslog will be written).
3581 Note that if the invoker is Exim, the logs remain available. Messing with
3582 this causes unlogged successful deliveries. */
3584 if (log_stderr && real_uid != exim_uid)
3585 f.really_exim = FALSE;
3588 /* Privilege is to be retained for the moment. It may be dropped later,
3589 depending on the job that this Exim process has been asked to do. For now, set
3590 the real uid to the effective so that subsequent re-execs of Exim are done by a
3594 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3596 /* If testing a filter, open the file(s) now, before wasting time doing other
3597 setups and reading the message. */
3599 if (filter_test & FTEST_SYSTEM)
3600 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3601 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3604 if (filter_test & FTEST_USER)
3605 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3606 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3609 /* Initialise lookup_list
3610 If debugging, already called above via version reporting.
3611 In either case, we initialise the list of available lookups while running
3612 as root. All dynamically modules are loaded from a directory which is
3613 hard-coded into the binary and is code which, if not a module, would be
3614 part of Exim already. Ability to modify the content of the directory
3615 is equivalent to the ability to modify a setuid binary!
3617 This needs to happen before we read the main configuration. */
3621 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3624 /* Read the main runtime configuration data; this gives up if there
3625 is a failure. It leaves the configuration file open so that the subsequent
3626 configuration data for delivery can be read if needed.
3628 NOTE: immediately after opening the configuration file we change the working
3629 directory to "/"! Later we change to $spool_directory. We do it there, because
3630 during readconf_main() some expansion takes place already. */
3632 /* Store the initial cwd before we change directories. Can be NULL if the
3633 dir has already been unlinked. */
3634 initial_cwd = os_getcwd(NULL, 0);
3637 -be[m] expansion test -
3638 -b[fF] filter test new
3640 -bmalware malware_test_file new
3642 -brw rewrite test new
3644 -bv[s] address verify -
3646 -bP <option> (except -bP config, which sets list_config)
3648 If any of these options is set, we suppress warnings about configuration
3649 issues (currently about tls_advertise_hosts and keep_environment not being
3652 readconf_main(checking || list_options);
3655 /* Now in directory "/" */
3657 if (cleanup_environment() == FALSE)
3658 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3661 /* If an action on specific messages is requested, or if a daemon or queue
3662 runner is being started, we need to know if Exim was called by an admin user.
3663 This is the case if the real user is root or exim, or if the real group is
3664 exim, or if one of the supplementary groups is exim or a group listed in
3665 admin_groups. We don't fail all message actions immediately if not admin_user,
3666 since some actions can be performed by non-admin users. Instead, set admin_user
3667 for later interrogation. */
3669 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3670 f.admin_user = TRUE;
3672 for (int i = 0; i < group_count && !f.admin_user; i++)
3673 if (group_list[i] == exim_gid)
3674 f.admin_user = TRUE;
3675 else if (admin_groups)
3676 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3677 if (admin_groups[j] == group_list[i])
3678 f.admin_user = TRUE;
3680 /* Another group of privileged users are the trusted users. These are root,
3681 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3682 are permitted to specify sender_addresses with -f on the command line, and
3683 other message parameters as well. */
3685 if (real_uid == root_uid || real_uid == exim_uid)
3686 f.trusted_caller = TRUE;
3690 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3691 if (trusted_users[i] == real_uid)
3692 f.trusted_caller = TRUE;
3695 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3696 if (trusted_groups[i] == real_gid)
3697 f.trusted_caller = TRUE;
3698 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3699 if (trusted_groups[i] == group_list[j])
3700 f.trusted_caller = TRUE;
3703 /* At this point, we know if the user is privileged and some command-line
3704 options become possibly impermissible, depending upon the configuration file. */
3706 if (checking && commandline_checks_require_admin && !f.admin_user)
3707 exim_fail("exim: those command-line flags are set to require admin\n");
3709 /* Handle the decoding of logging options. */
3711 decode_bits(log_selector, log_selector_size, log_notall,
3712 log_selector_string, log_options, log_options_count, US"log", 0);
3716 debug_printf("configuration file is %s\n", config_main_filename);
3717 debug_printf("log selectors =");
3718 for (int i = 0; i < log_selector_size; i++)
3719 debug_printf(" %08x", log_selector[i]);
3723 /* If domain literals are not allowed, check the sender address that was
3724 supplied with -f. Ditto for a stripped trailing dot. */
3728 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3729 exim_fail("exim: bad -f address \"%s\": domain literals not "
3730 "allowed\n", sender_address);
3731 if (f_end_dot && !strip_trailing_dot)
3732 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3733 "(trailing dot not allowed)\n", sender_address);
3736 /* See if an admin user overrode our logging. */
3738 if (cmdline_syslog_name)
3741 syslog_processname = cmdline_syslog_name;
3742 log_file_path = string_copy(CUS"syslog");
3745 /* not a panic, non-privileged users should not be able to spam paniclog */
3747 "exim: you lack sufficient privilege to specify syslog process name\n");
3749 /* Paranoia check of maximum lengths of certain strings. There is a check
3750 on the length of the log file path in log.c, which will come into effect
3751 if there are any calls to write the log earlier than this. However, if we
3752 get this far but the string is very long, it is better to stop now than to
3753 carry on and (e.g.) receive a message and then have to collapse. The call to
3754 log_write() from here will cause the ultimate panic collapse if the complete
3755 file name exceeds the buffer length. */
3757 if (Ustrlen(log_file_path) > 200)
3758 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3759 "log_file_path is longer than 200 chars: aborting");
3761 if (Ustrlen(pid_file_path) > 200)
3762 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3763 "pid_file_path is longer than 200 chars: aborting");
3765 if (Ustrlen(spool_directory) > 200)
3766 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3767 "spool_directory is longer than 200 chars: aborting");
3769 /* Length check on the process name given to syslog for its TAG field,
3770 which is only permitted to be 32 characters or less. See RFC 3164. */
3772 if (Ustrlen(syslog_processname) > 32)
3773 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3774 "syslog_processname is longer than 32 chars: aborting");
3779 log_write(0, LOG_MAIN, "%s", log_oneline);
3780 return EXIT_SUCCESS;
3783 return EXIT_FAILURE;
3785 /* In some operating systems, the environment variable TMPDIR controls where
3786 temporary files are created; Exim doesn't use these (apart from when delivering
3787 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3788 If TMPDIR is found in the environment, reset it to the value defined in the
3789 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3790 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3791 EXIM_TMPDIR by the build scripts.
3795 if (environ) for (uschar ** p = USS environ; *p; p++)
3796 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3798 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3799 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3801 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3805 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3806 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3807 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3808 called by a user who has set the TZ variable. This then affects the timestamps
3809 in log files and in Received: headers, and any created Date: header lines. The
3810 required timezone is settable in the configuration file, so nothing can be done
3811 about this earlier - but hopefully nothing will normally be logged earlier than
3812 this. We have to make a new environment if TZ is wrong, but don't bother if
3813 timestamps_utc is set, because then all times are in UTC anyway. */
3815 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3816 f.timestamps_utc = TRUE;
3819 uschar *envtz = US getenv("TZ");
3821 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3822 : timezone_string != NULL
3825 uschar **p = USS environ;
3829 if (environ) while (*p++) count++;
3830 if (!envtz) count++;
3831 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3832 if (environ) for (p = USS environ; *p; p++)
3833 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3834 if (timezone_string)
3836 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3837 sprintf(CS *newp++, "TZ=%s", timezone_string);
3842 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3843 tod_stamp(tod_log));
3847 /* Handle the case when we have removed the setuid privilege because of -C or
3848 -D. This means that the caller of Exim was not root.
3850 There is a problem if we were running as the Exim user. The sysadmin may
3851 expect this case to retain privilege because "the binary was called by the
3852 Exim user", but it hasn't, because either the -D option set macros, or the
3853 -C option set a non-trusted configuration file. There are two possibilities:
3855 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3856 to do message deliveries. Thus, the fact that it is running as a
3857 non-privileged user is plausible, and might be wanted in some special
3858 configurations. However, really_exim will have been set false when
3859 privilege was dropped, to stop Exim trying to write to its normal log
3860 files. Therefore, re-enable normal log processing, assuming the sysadmin
3861 has set up the log directory correctly.
3863 (2) If deliver_drop_privilege is not set, the configuration won't work as
3864 apparently intended, and so we log a panic message. In order to retain
3865 root for -C or -D, the caller must either be root or be invoking a
3866 trusted configuration file (when deliver_drop_privilege is false). */
3868 if ( removed_privilege
3869 && (!f.trusted_config || opt_D_used)
3870 && real_uid == exim_uid)
3871 if (deliver_drop_privilege)
3872 f.really_exim = TRUE; /* let logging work normally */
3874 log_write(0, LOG_MAIN|LOG_PANIC,
3875 "exim user lost privilege for using %s option",
3876 f.trusted_config? "-D" : "-C");
3878 /* Start up Perl interpreter if Perl support is configured and there is a
3879 perl_startup option, and the configuration or the command line specifies
3880 initializing starting. Note that the global variables are actually called
3881 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3884 if (perl_start_option != 0)
3885 opt_perl_at_start = (perl_start_option > 0);
3886 if (opt_perl_at_start && opt_perl_startup != NULL)
3889 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3890 if ((errstr = init_perl(opt_perl_startup)))
3891 exim_fail("exim: error in perl_startup code: %s\n", errstr);
3892 opt_perl_started = TRUE;
3894 #endif /* EXIM_PERL */
3896 /* Log the arguments of the call if the configuration file said so. This is
3897 a debugging feature for finding out what arguments certain MUAs actually use.
3898 Don't attempt it if logging is disabled, or if listing variables or if
3899 verifying/testing addresses or expansions. */
3901 if ( (debug_selector & D_any || LOGGING(arguments))
3902 && f.really_exim && !list_options && !checking)
3904 uschar *p = big_buffer;
3905 Ustrcpy(p, "cwd= (failed)");
3911 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3912 p += 4 + Ustrlen(initial_cwd);
3913 /* in case p is near the end and we don't provide enough space for
3914 * string_format to be willing to write. */
3918 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3920 for (int i = 0; i < argc; i++)
3922 int len = Ustrlen(argv[i]);
3923 const uschar *printing;
3925 if (p + len + 8 >= big_buffer + big_buffer_size)
3928 log_write(0, LOG_MAIN, "%s", big_buffer);
3929 Ustrcpy(big_buffer, "...");
3932 printing = string_printing(argv[i]);
3933 if (printing[0] == 0) quote = US"\""; else
3935 const uschar *pp = printing;
3937 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3939 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3940 (p - big_buffer) - 4), printing, quote);
3943 if (LOGGING(arguments))
3944 log_write(0, LOG_MAIN, "%s", big_buffer);
3946 debug_printf("%s\n", big_buffer);
3949 /* Set the working directory to be the top-level spool directory. We don't rely
3950 on this in the code, which always uses fully qualified names, but it's useful
3951 for core dumps etc. Don't complain if it fails - the spool directory might not
3952 be generally accessible and calls with the -C option (and others) have lost
3953 privilege by now. Before the chdir, we try to ensure that the directory exists.
3956 if (Uchdir(spool_directory) != 0)
3959 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3960 dummy = /* quieten compiler */ Uchdir(spool_directory);
3961 dummy = dummy; /* yet more compiler quietening, sigh */
3964 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3965 alias file. Exim doesn't have such a concept, but this call is screwed into
3966 Sun's YP makefiles. Handle this by calling a configured script, as the real
3967 user who called Exim. The -oA option can be used to pass an argument to the
3972 (void)fclose(config_file);
3973 if (bi_command != NULL)
3977 argv[i++] = bi_command;
3978 if (alias_arg != NULL) argv[i++] = alias_arg;
3981 setgroups(group_count, group_list);
3982 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3984 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3985 (argv[1] == NULL)? US"" : argv[1]);
3987 execv(CS argv[0], (char *const *)argv);
3988 exim_fail("exim: exec failed: %s\n", strerror(errno));
3992 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3997 /* We moved the admin/trusted check to be immediately after reading the
3998 configuration file. We leave these prints here to ensure that syslog setup,
3999 logfile setup, and so on has already happened. */
4001 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4002 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4004 /* Only an admin user may start the daemon or force a queue run in the default
4005 configuration, but the queue run restriction can be relaxed. Only an admin
4006 user may request that a message be returned to its sender forthwith. Only an
4007 admin user may specify a debug level greater than D_v (because it might show
4008 passwords, etc. in lookup queries). Only an admin user may request a queue
4009 count. Only an admin user can use the test interface to scan for email
4010 (because Exim will be in the spool dir and able to look at mails). */
4014 BOOL debugset = (debug_selector & ~D_v) != 0;
4015 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4016 (count_queue && queue_list_requires_admin) ||
4017 (list_queue && queue_list_requires_admin) ||
4018 (queue_interval >= 0 && prod_requires_admin) ||
4019 (debugset && !f.running_in_test_harness))
4020 exim_fail("exim:%s permission denied\n", debugset? " debugging" : "");
4023 /* If the real user is not root or the exim uid, the argument for passing
4024 in an open TCP/IP connection for another message is not permitted, nor is
4025 running with the -N option for any delivery action, unless this call to exim is
4026 one that supplied an input message, or we are using a patched exim for
4027 regression testing. */
4029 if (real_uid != root_uid && real_uid != exim_uid &&
4030 (continue_hostname != NULL ||
4032 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4033 )) && !f.running_in_test_harness)
4034 exim_fail("exim: Permission denied\n");
4036 /* If the caller is not trusted, certain arguments are ignored when running for
4037 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4038 Note that authority for performing certain actions on messages is tested in the
4039 queue_action() function. */
4041 if (!f.trusted_caller && !checking)
4043 sender_host_name = sender_host_address = interface_address =
4044 sender_ident = received_protocol = NULL;
4045 sender_host_port = interface_port = 0;
4046 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4049 /* If a sender host address is set, extract the optional port number off the
4050 end of it and check its syntax. Do the same thing for the interface address.
4051 Exim exits if the syntax is bad. */
4055 if (sender_host_address != NULL)
4056 sender_host_port = check_port(sender_host_address);
4057 if (interface_address != NULL)
4058 interface_port = check_port(interface_address);
4061 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4064 if (f.trusted_caller)
4066 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4067 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4070 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4073 /* If an SMTP message is being received check to see if the standard input is a
4074 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4075 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4080 union sockaddr_46 inetd_sock;
4081 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4082 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4084 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4085 if (family == AF_INET || family == AF_INET6)
4087 union sockaddr_46 interface_sock;
4088 size = sizeof(interface_sock);
4090 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4091 interface_address = host_ntoa(-1, &interface_sock, NULL,
4094 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4096 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4099 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4100 NULL, &sender_host_port);
4101 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4102 "inetd is not supported when mua_wrapper is set");
4106 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4111 /* If the load average is going to be needed while receiving a message, get it
4112 now for those OS that require the first call to os_getloadavg() to be done as
4113 root. There will be further calls later for each message received. */
4115 #ifdef LOAD_AVG_NEEDS_ROOT
4116 if (receiving_message &&
4117 (queue_only_load >= 0 ||
4118 (f.is_inetd && smtp_load_reserve >= 0)
4121 load_average = OS_GETLOADAVG();
4125 /* The queue_only configuration option can be overridden by -odx on the command
4126 line, except that if queue_only_override is false, queue_only cannot be unset
4127 from the command line. */
4129 if (queue_only_set && (queue_only_override || arg_queue_only))
4130 queue_only = arg_queue_only;
4132 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4135 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4136 if (arg_smtp_receive_timeout >= 0)
4137 smtp_receive_timeout = arg_smtp_receive_timeout;
4139 /* If Exim was started with root privilege, unless we have already removed the
4140 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4141 except when starting the daemon or doing some kind of delivery or address
4142 testing (-bt). These are the only cases when root need to be retained. We run
4143 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4144 retained only for starting the daemon. We always do the initgroups() in this
4145 situation (controlled by the TRUE below), in order to be as close as possible
4146 to the state Exim usually runs in. */
4148 if (!unprivileged && /* originally had root AND */
4149 !removed_privilege && /* still got root AND */
4150 !f.daemon_listen && /* not starting the daemon */
4151 queue_interval <= 0 && /* (either kind of daemon) */
4153 deliver_drop_privilege || /* requested unprivileged */
4155 queue_interval < 0 && /* not running the queue */
4156 (msg_action_arg < 0 || /* and */
4157 msg_action != MSG_DELIVER) && /* not delivering and */
4158 (!checking || !f.address_test_mode) /* not address checking */
4160 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4162 /* When we are retaining a privileged uid, we still change to the exim gid. */
4167 rv = setgid(exim_gid);
4168 /* Impact of failure is that some stuff might end up with an incorrect group.
4169 We track this for failures from root, since any attempt to change privilege
4170 by root should succeed and failures should be examined. For non-root,
4171 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4172 no need to complain then. */
4174 if (!(unprivileged || removed_privilege))
4175 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4177 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4178 (long int)exim_gid, strerror(errno));
4181 /* Handle a request to scan a file for malware */
4182 if (malware_test_file)
4184 #ifdef WITH_CONTENT_SCAN
4186 set_process_info("scanning file for malware");
4187 result = malware_in_file(malware_test_file);
4190 printf("No malware found.\n");
4195 printf("Malware lookup returned non-okay/fail: %d\n", result);
4199 printf("Malware found: %s\n", malware_name);
4201 printf("Malware scan detected malware of unknown name.\n");
4203 printf("Malware scanning not enabled at compile time.\n");
4208 /* Handle a request to list the delivery queue */
4212 set_process_info("listing the queue");
4213 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4217 /* Handle a request to count the delivery queue */
4221 set_process_info("counting the queue");
4226 /* Handle actions on specific messages, except for the force delivery and
4227 message load actions, which are done below. Some actions take a whole list of
4228 message ids, which are known to continue up to the end of the arguments. Others
4229 take a single message id and then operate on the recipients list. */
4231 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4233 int yield = EXIT_SUCCESS;
4234 set_process_info("acting on specified messages");
4236 /* ACL definitions may be needed when removing a message (-Mrm) because
4237 event_action gets expanded */
4239 if (msg_action == MSG_REMOVE)
4242 if (!one_msg_action)
4244 for (i = msg_action_arg; i < argc; i++)
4245 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4246 yield = EXIT_FAILURE;
4249 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4250 recipients_arg)) yield = EXIT_FAILURE;
4254 /* We used to set up here to skip reading the ACL section, on
4255 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4256 Now, since the intro of the ${acl } expansion, ACL definitions may be
4257 needed in transports so we lost the optimisation. */
4261 /* The configuration data will have been read into POOL_PERM because we won't
4262 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4263 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4264 configuration were read into POOL_MAIN, because we don't do any resets till
4265 later on. However, it seems right, and it does ensure that both pools get used.
4268 store_pool = POOL_MAIN;
4270 /* Handle the -brt option. This is for checking out retry configurations.
4271 The next three arguments are a domain name or a complete address, and
4272 optionally two error numbers. All it does is to call the function that
4273 scans the retry configuration data. */
4275 if (test_retry_arg >= 0)
4277 retry_config *yield;
4278 int basic_errno = 0;
4282 if (test_retry_arg >= argc)
4284 printf("-brt needs a domain or address argument\n");
4285 exim_exit(EXIT_FAILURE, US"main");
4287 s1 = argv[test_retry_arg++];
4290 /* If the first argument contains no @ and no . it might be a local user
4291 or it might be a single-component name. Treat as a domain. */
4293 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4295 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4296 "being \ntreated as a one-component domain, not as a local part.\n\n",
4300 /* There may be an optional second domain arg. */
4302 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4303 s2 = argv[test_retry_arg++];
4305 /* The final arg is an error name */
4307 if (test_retry_arg < argc)
4309 uschar *ss = argv[test_retry_arg];
4311 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4314 printf("%s\n", CS error);
4315 return EXIT_FAILURE;
4318 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4319 code > 100 as an error is for matching codes to the decade. Turn them into
4320 a real error code, off the decade. */
4322 if (basic_errno == ERRNO_MAIL4XX ||
4323 basic_errno == ERRNO_RCPT4XX ||
4324 basic_errno == ERRNO_DATA4XX)
4326 int code = (more_errno >> 8) & 255;
4328 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4329 else if (code > 100)
4330 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4334 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4335 printf("No retry information found\n");
4338 more_errno = yield->more_errno;
4339 printf("Retry rule: %s ", yield->pattern);
4341 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4343 printf("quota%s%s ",
4344 (more_errno > 0)? "_" : "",
4345 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4347 else if (yield->basic_errno == ECONNREFUSED)
4349 printf("refused%s%s ",
4350 (more_errno > 0)? "_" : "",
4351 (more_errno == 'M')? "MX" :
4352 (more_errno == 'A')? "A" : "");
4354 else if (yield->basic_errno == ETIMEDOUT)
4357 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4359 if (more_errno != 0) printf("_%s",
4360 (more_errno == 'M')? "MX" : "A");
4363 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4364 printf("auth_failed ");
4367 for (retry_rule * r = yield->rules; r; r = r->next)
4369 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4370 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4376 printf(",%d.", x/1000);
4390 exim_exit(EXIT_SUCCESS, US"main");
4393 /* Handle a request to list one or more configuration options */
4394 /* If -n was set, we suppress some information */
4399 set_process_info("listing variables");
4400 if (recipients_arg >= argc)
4401 fail = !readconf_print(US"all", NULL, flag_n);
4402 else for (i = recipients_arg; i < argc; i++)
4405 (Ustrcmp(argv[i], "router") == 0 ||
4406 Ustrcmp(argv[i], "transport") == 0 ||
4407 Ustrcmp(argv[i], "authenticator") == 0 ||
4408 Ustrcmp(argv[i], "macro") == 0 ||
4409 Ustrcmp(argv[i], "environment") == 0))
4411 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4415 fail = !readconf_print(argv[i], NULL, flag_n);
4417 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4422 set_process_info("listing config");
4423 exim_exit(readconf_print(US"config", NULL, flag_n)
4424 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4428 /* Initialise subsystems as required */
4429 #ifndef DISABLE_DKIM
4435 /* Handle a request to deliver one or more messages that are already on the
4436 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4437 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4439 Delivery of specific messages is typically used for a small number when
4440 prodding by hand (when the option forced_delivery will be set) or when
4441 re-execing to regain root privilege. Each message delivery must happen in a
4442 separate process, so we fork a process for each one, and run them sequentially
4443 so that debugging output doesn't get intertwined, and to avoid spawning too
4444 many processes if a long list is given. However, don't fork for the last one;
4445 this saves a process in the common case when Exim is called to deliver just one
4448 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4450 if (prod_requires_admin && !f.admin_user)
4452 fprintf(stderr, "exim: Permission denied\n");
4453 exim_exit(EXIT_FAILURE, US"main");
4455 set_process_info("delivering specified messages");
4456 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4457 for (i = msg_action_arg; i < argc; i++)
4462 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4463 else if ((pid = fork()) == 0)
4465 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4466 _exit(EXIT_SUCCESS);
4470 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4472 exim_exit(EXIT_FAILURE, US"main");
4476 exim_exit(EXIT_SUCCESS, US"main");
4480 /* If only a single queue run is requested, without SMTP listening, we can just
4481 turn into a queue runner, with an optional starting message id. */
4483 if (queue_interval == 0 && !f.daemon_listen)
4485 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4486 (start_queue_run_id == NULL)? US"" : US" starting at ",
4487 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4488 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4489 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4491 set_process_info("running the '%s' queue (single queue run)", queue_name);
4493 set_process_info("running the queue (single queue run)");
4494 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4495 exim_exit(EXIT_SUCCESS, US"main");
4499 /* Find the login name of the real user running this process. This is always
4500 needed when receiving a message, because it is written into the spool file. It
4501 may also be used to construct a from: or a sender: header, and in this case we
4502 need the user's full name as well, so save a copy of it, checked for RFC822
4503 syntax and munged if necessary, if it hasn't previously been set by the -F
4504 argument. We may try to get the passwd entry more than once, in case NIS or
4505 other delays are in evidence. Save the home directory for use in filter testing
4510 if ((pw = getpwuid(real_uid)) != NULL)
4512 originator_login = string_copy(US pw->pw_name);
4513 originator_home = string_copy(US pw->pw_dir);
4515 /* If user name has not been set by -F, set it from the passwd entry
4516 unless -f has been used to set the sender address by a trusted user. */
4518 if (!originator_name)
4520 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4522 uschar *name = US pw->pw_gecos;
4523 uschar *amp = Ustrchr(name, '&');
4526 /* Most Unix specify that a '&' character in the gecos field is
4527 replaced by a copy of the login name, and some even specify that
4528 the first character should be upper cased, so that's what we do. */
4533 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4534 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4535 buffer[loffset] = toupper(buffer[loffset]);
4539 /* If a pattern for matching the gecos field was supplied, apply
4540 it and then expand the name string. */
4542 if (gecos_pattern && gecos_name)
4545 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4547 if (regex_match_and_setup(re, name, 0, -1))
4549 uschar *new_name = expand_string(gecos_name);
4553 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4554 "gecos field \"%s\"\n", new_name, name);
4557 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4558 "\"%s\": %s\n", gecos_name, expand_string_message);
4560 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4561 "gecos field \"%s\"\n", gecos_pattern, name);
4562 store_free((void *)re);
4564 originator_name = string_copy(name);
4567 /* A trusted caller has used -f but not -F */
4569 else originator_name = US"";
4572 /* Break the retry loop */
4577 if (++i > finduser_retries) break;
4581 /* If we cannot get a user login, log the incident and give up, unless the
4582 configuration specifies something to use. When running in the test harness,
4583 any setting of unknown_login overrides the actual name. */
4585 if (originator_login == NULL || f.running_in_test_harness)
4587 if (unknown_login != NULL)
4589 originator_login = expand_string(unknown_login);
4590 if (originator_name == NULL && unknown_username != NULL)
4591 originator_name = expand_string(unknown_username);
4592 if (originator_name == NULL) originator_name = US"";
4594 if (originator_login == NULL)
4595 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4599 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4602 originator_name = string_copy(parse_fix_phrase(originator_name,
4603 Ustrlen(originator_name), big_buffer, big_buffer_size));
4605 /* If a message is created by this call of Exim, the uid/gid of its originator
4606 are those of the caller. These values are overridden if an existing message is
4607 read in from the spool. */
4609 originator_uid = real_uid;
4610 originator_gid = real_gid;
4612 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4613 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4615 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4616 returns. We leave this till here so that the originator_ fields are available
4617 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4620 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4624 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4625 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4626 "mua_wrapper is set");
4631 /* If the sender ident has not been set (by a trusted caller) set it to
4632 the caller. This will get overwritten below for an inetd call. If a trusted
4633 caller has set it empty, unset it. */
4635 if (sender_ident == NULL) sender_ident = originator_login;
4636 else if (sender_ident[0] == 0) sender_ident = NULL;
4638 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4639 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4640 originator_* variables set. */
4642 if (test_rewrite_arg >= 0)
4644 f.really_exim = FALSE;
4645 if (test_rewrite_arg >= argc)
4647 printf("-brw needs an address argument\n");
4648 exim_exit(EXIT_FAILURE, US"main");
4650 rewrite_test(argv[test_rewrite_arg]);
4651 exim_exit(EXIT_SUCCESS, US"main");
4654 /* A locally-supplied message is considered to be coming from a local user
4655 unless a trusted caller supplies a sender address with -f, or is passing in the
4656 message via SMTP (inetd invocation or otherwise). */
4658 if ((sender_address == NULL && !smtp_input) ||
4659 (!f.trusted_caller && filter_test == FTEST_NONE))
4661 f.sender_local = TRUE;
4663 /* A trusted caller can supply authenticated_sender and authenticated_id
4664 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4665 defaults except when host checking. */
4667 if (authenticated_sender == NULL && !host_checking)
4668 authenticated_sender = string_sprintf("%s@%s", originator_login,
4669 qualify_domain_sender);
4670 if (authenticated_id == NULL && !host_checking)
4671 authenticated_id = originator_login;
4674 /* Trusted callers are always permitted to specify the sender address.
4675 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4676 is specified is the empty address. However, if a trusted caller does not
4677 specify a sender address for SMTP input, we leave sender_address unset. This
4678 causes the MAIL commands to be honoured. */
4680 if ((!smtp_input && sender_address == NULL) ||
4681 !receive_check_set_sender(sender_address))
4683 /* Either the caller is not permitted to set a general sender, or this is
4684 non-SMTP input and the trusted caller has not set a sender. If there is no
4685 sender, or if a sender other than <> is set, override with the originator's
4686 login (which will get qualified below), except when checking things. */
4688 if (sender_address == NULL /* No sender_address set */
4690 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4691 !checking)) /* Not running tests, including filter tests */
4693 sender_address = originator_login;
4694 f.sender_address_forced = FALSE;
4695 sender_address_domain = 0;
4699 /* Remember whether an untrusted caller set the sender address */
4701 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4703 /* Ensure that the sender address is fully qualified unless it is the empty
4704 address, which indicates an error message, or doesn't exist (root caller, smtp
4705 interface, no -f argument). */
4707 if (sender_address != NULL && sender_address[0] != 0 &&
4708 sender_address_domain == 0)
4709 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4710 qualify_domain_sender);
4712 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4714 /* Handle a request to verify a list of addresses, or test them for delivery.
4715 This must follow the setting of the sender address, since routers can be
4716 predicated upon the sender. If no arguments are given, read addresses from
4717 stdin. Set debug_level to at least D_v to get full output for address testing.
4720 if (verify_address_mode || f.address_test_mode)
4723 int flags = vopt_qualify;
4725 if (verify_address_mode)
4727 if (!verify_as_sender) flags |= vopt_is_recipient;
4728 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4733 flags |= vopt_is_recipient;
4734 debug_selector |= D_v;
4735 debug_file = stderr;
4736 debug_fd = fileno(debug_file);
4737 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4740 if (recipients_arg < argc)
4742 while (recipients_arg < argc)
4744 uschar *s = argv[recipients_arg++];
4747 BOOL finished = FALSE;
4748 uschar *ss = parse_find_address_end(s, FALSE);
4749 if (*ss == ',') *ss = 0; else finished = TRUE;
4750 test_address(s, flags, &exit_value);
4753 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4760 uschar *s = get_stdinput(NULL, NULL);
4761 if (s == NULL) break;
4762 test_address(s, flags, &exit_value);
4766 exim_exit(exit_value, US"main");
4769 /* Handle expansion checking. Either expand items on the command line, or read
4770 from stdin if there aren't any. If -Mset was specified, load the message so
4771 that its variables can be used, but restrict this facility to admin users.
4772 Otherwise, if -bem was used, read a message from stdin. */
4776 dns_init(FALSE, FALSE, FALSE);
4777 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4779 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4781 exim_fail("exim: permission denied\n");
4782 message_id = argv[msg_action_arg];
4783 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4784 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4785 printf ("Failed to load message datafile %s\n", message_id);
4786 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4787 printf ("Failed to load message %s\n", message_id);
4790 /* Read a test message from a file. We fudge it up to be on stdin, saving
4791 stdin itself for later reading of expansion strings. */
4793 else if (expansion_test_message)
4795 int save_stdin = dup(0);
4796 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4798 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
4801 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4802 message_ended = END_NOTENDED;
4803 read_message_body(receive_msg(extract_recipients));
4804 message_linecount += body_linecount;
4805 (void)dup2(save_stdin, 0);
4806 (void)close(save_stdin);
4807 clearerr(stdin); /* Required by Darwin */
4810 /* Only admin users may see config-file macros this way */
4812 if (!f.admin_user) macros_user = macros = mlast = NULL;
4814 /* Allow $recipients for this testing */
4816 f.enable_dollar_recipients = TRUE;
4818 /* Expand command line items */
4820 if (recipients_arg < argc)
4821 while (recipients_arg < argc)
4822 expansion_test_line(argv[recipients_arg++]);
4828 char *(*fn_readline)(const char *) = NULL;
4829 void (*fn_addhist)(const char *) = NULL;
4833 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4836 while (s = get_stdinput(fn_readline, fn_addhist))
4837 expansion_test_line(s);
4840 if (dlhandle) dlclose(dlhandle);
4844 /* The data file will be open after -Mset */
4846 if (deliver_datafile >= 0)
4848 (void)close(deliver_datafile);
4849 deliver_datafile = -1;
4852 exim_exit(EXIT_SUCCESS, US"main: expansion test");
4856 /* The active host name is normally the primary host name, but it can be varied
4857 for hosts that want to play several parts at once. We need to ensure that it is
4858 set for host checking, and for receiving messages. */
4860 smtp_active_hostname = primary_hostname;
4861 if (raw_active_hostname != NULL)
4863 uschar *nah = expand_string(raw_active_hostname);
4866 if (!f.expand_string_forcedfail)
4867 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4868 "(smtp_active_hostname): %s", raw_active_hostname,
4869 expand_string_message);
4871 else if (nah[0] != 0) smtp_active_hostname = nah;
4874 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4875 given IP address so that the blocking and relay configuration can be tested.
4876 Unless a sender_ident was set by -oMt, we discard it (the default is the
4877 caller's login name). An RFC 1413 call is made only if we are running in the
4878 test harness and an incoming interface and both ports are specified, because
4879 there is no TCP/IP call to find the ident for. */
4886 if (!sender_ident_set)
4888 sender_ident = NULL;
4889 if (f.running_in_test_harness && sender_host_port != 0 &&
4890 interface_address != NULL && interface_port != 0)
4891 verify_get_ident(1413);
4894 /* In case the given address is a non-canonical IPv6 address, canonicalize
4895 it. The code works for both IPv4 and IPv6, as it happens. */
4897 size = host_aton(sender_host_address, x);
4898 sender_host_address = store_get(48); /* large enough for full IPv6 */
4899 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4901 /* Now set up for testing */
4903 host_build_sender_fullhost();
4907 f.sender_local = FALSE;
4908 f.sender_host_notsocket = TRUE;
4909 debug_file = stderr;
4910 debug_fd = fileno(debug_file);
4911 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4912 "**** but without any ident (RFC 1413) callback.\n"
4913 "**** This is not for real!\n\n",
4914 sender_host_address);
4916 memset(sender_host_cache, 0, sizeof(sender_host_cache));
4917 if (verify_check_host(&hosts_connection_nolog) == OK)
4918 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
4919 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4921 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4922 because a log line has already been written for all its failure exists
4923 (usually "connection refused: <reason>") and writing another one is
4924 unnecessary clutter. */
4926 if (smtp_start_session())
4928 for (reset_point = store_get(0); ; store_reset(reset_point))
4930 if (smtp_setup_msg() <= 0) break;
4931 if (!receive_msg(FALSE)) break;
4933 return_path = sender_address = NULL;
4934 dnslist_domain = dnslist_matched = NULL;
4935 #ifndef DISABLE_DKIM
4936 dkim_cur_signer = NULL;
4939 deliver_localpart_orig = NULL;
4940 deliver_domain_orig = NULL;
4941 callout_address = sending_ip_address = NULL;
4942 sender_rate = sender_rate_limit = sender_rate_period = NULL;
4946 exim_exit(EXIT_SUCCESS, US"main");
4950 /* Arrange for message reception if recipients or SMTP were specified;
4951 otherwise complain unless a version print (-bV) happened or this is a filter
4952 verification test or info dump.
4953 In the former case, show the configuration file name. */
4955 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4957 if (version_printed)
4959 if (Ustrchr(config_main_filelist, ':'))
4960 printf("Configuration file search path is %s\n", config_main_filelist);
4961 printf("Configuration file is %s\n", config_main_filename);
4962 return EXIT_SUCCESS;
4965 if (info_flag != CMDINFO_NONE)
4967 show_exim_information(info_flag, info_stdout ? stdout : stderr);
4968 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
4971 if (filter_test == FTEST_NONE)
4972 exim_usage(called_as);
4976 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4977 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4978 that we are not called from inetd, because that is rejected above. The
4979 following configuration settings are forced here:
4981 (1) Synchronous delivery (-odi)
4982 (2) Errors to stderr (-oep == -oeq)
4983 (3) No parallel remote delivery
4984 (4) Unprivileged delivery
4986 We don't force overall queueing options because there are several of them;
4987 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4988 to override any SMTP queueing. */
4992 f.synchronous_delivery = TRUE;
4993 arg_error_handling = ERRORS_STDERR;
4994 remote_max_parallel = 1;
4995 deliver_drop_privilege = TRUE;
4996 f.queue_smtp = FALSE;
4997 queue_smtp_domains = NULL;
4999 message_utf8_downconvert = -1; /* convert-if-needed */
5004 /* Prepare to accept one or more new messages on the standard input. When a
5005 message has been read, its id is returned in message_id[]. If doing immediate
5006 delivery, we fork a delivery process for each received message, except for the
5007 last one, where we can save a process switch.
5009 It is only in non-smtp mode that error_handling is allowed to be changed from
5010 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5011 sendmail error modes other than -oem ever actually used? Later: yes.) */
5013 if (!smtp_input) error_handling = arg_error_handling;
5015 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5016 logging being sent down the socket and make an identd call to get the
5019 else if (f.is_inetd)
5021 (void)fclose(stderr);
5022 exim_nullstd(); /* Re-open to /dev/null */
5023 verify_get_ident(IDENT_PORT);
5024 host_build_sender_fullhost();
5025 set_process_info("handling incoming connection from %s via inetd",
5029 /* If the sender host address has been set, build sender_fullhost if it hasn't
5030 already been done (which it will have been for inetd). This caters for the
5031 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5032 so that the test for IP options is skipped for -bs input. */
5034 if (sender_host_address && !sender_fullhost)
5036 host_build_sender_fullhost();
5037 set_process_info("handling incoming connection from %s via -oMa",
5039 f.sender_host_notsocket = TRUE;
5042 /* Otherwise, set the sender host as unknown except for inetd calls. This
5043 prevents host checking in the case of -bs not from inetd and also for -bS. */
5045 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5047 /* If stdout does not exist, then dup stdin to stdout. This can happen
5048 if exim is started from inetd. In this case fd 0 will be set to the socket,
5049 but fd 1 will not be set. This also happens for passed SMTP channels. */
5051 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5053 /* Set up the incoming protocol name and the state of the program. Root is
5054 allowed to force received protocol via the -oMr option above. If we have come
5055 via inetd, the process info has already been set up. We don't set
5056 received_protocol here for smtp input, as it varies according to
5057 batch/HELO/EHLO/AUTH/TLS. */
5061 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5062 smtp_batched_input? "batched " : "",
5063 (sender_address!= NULL)? sender_address : originator_login);
5067 int old_pool = store_pool;
5068 store_pool = POOL_PERM;
5069 if (!received_protocol)
5070 received_protocol = string_sprintf("local%s", called_as);
5071 store_pool = old_pool;
5072 set_process_info("accepting a local non-SMTP message from <%s>",
5076 /* Initialize the session_local_queue-only flag (this will be ignored if
5077 mua_wrapper is set) */
5080 session_local_queue_only = queue_only;
5082 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5083 the spool if so configured. On failure, we must not attempt to send an error
5084 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5085 error code is given.) */
5087 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5088 exim_fail("exim: insufficient disk space\n");
5090 /* If this is smtp input of any kind, real or batched, handle the start of the
5093 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5094 because a log line has already been written for all its failure exists
5095 (usually "connection refused: <reason>") and writing another one is
5096 unnecessary clutter. */
5102 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5103 if (verify_check_host(&hosts_connection_nolog) == OK)
5104 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5105 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5106 if (!smtp_start_session())
5109 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5113 /* Otherwise, set up the input size limit here. */
5117 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5118 if (expand_string_message)
5119 if (thismessage_size_limit == -1)
5120 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5121 "message_size_limit: %s", expand_string_message);
5123 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5124 "message_size_limit: %s", expand_string_message);
5127 /* Loop for several messages when reading SMTP input. If we fork any child
5128 processes, we don't want to wait for them unless synchronous delivery is
5129 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5130 same as SIG_DFL, despite the fact that documentation often lists the default as
5131 "ignore". This is a confusing area. This is what I know:
5133 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5134 processes that complete simply to go away without ever becoming defunct. You
5135 can't then wait for them - but we don't want to wait for them in the
5136 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5137 happen for all OS (e.g. *BSD is different).
5139 But that's not the end of the story. Some (many? all?) systems have the
5140 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5141 has by default, so it seems that the difference is merely one of default
5142 (compare restarting vs non-restarting signals).
5144 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5145 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5146 of the loop below. Paranoia rules.
5148 February 2003: That's *still* not the end of the story. There are now versions
5149 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5150 process then calls waitpid(), a grumble is written to the system log, because
5151 this is logically inconsistent. In other words, it doesn't like the paranoia.
5152 As a consequence of this, the waitpid() below is now excluded if we are sure
5153 that SIG_IGN works. */
5155 if (!f.synchronous_delivery)
5158 struct sigaction act;
5159 act.sa_handler = SIG_IGN;
5160 sigemptyset(&(act.sa_mask));
5161 act.sa_flags = SA_NOCLDWAIT;
5162 sigaction(SIGCHLD, &act, NULL);
5164 signal(SIGCHLD, SIG_IGN);
5168 /* Save the current store pool point, for resetting at the start of
5169 each message, and save the real sender address, if any. */
5171 reset_point = store_get(0);
5172 real_sender_address = sender_address;
5174 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5175 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5182 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5183 input and build the recipients list, before calling receive_msg() to read the
5184 message proper. Whatever sender address is given in the SMTP transaction is
5185 often ignored for local senders - we use the actual sender, which is normally
5186 either the underlying user running this process or a -f argument provided by
5187 a trusted caller. It is saved in real_sender_address. The test for whether to
5188 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5193 if ((rc = smtp_setup_msg()) > 0)
5195 if (real_sender_address != NULL &&
5196 !receive_check_set_sender(sender_address))
5198 sender_address = raw_sender = real_sender_address;
5199 sender_address_unrewritten = NULL;
5202 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5203 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5204 the very end. The result of the ACL is ignored (as for other non-SMTP
5205 messages). It is run for its potential side effects. */
5207 if (smtp_batched_input && acl_not_smtp_start != NULL)
5209 uschar *user_msg, *log_msg;
5210 f.enable_dollar_recipients = TRUE;
5211 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5212 &user_msg, &log_msg);
5213 f.enable_dollar_recipients = FALSE;
5216 /* Now get the data for the message */
5218 more = receive_msg(extract_recipients);
5219 if (message_id[0] == 0)
5221 cancel_cutthrough_connection(TRUE, US"receive dropped");
5222 if (more) goto moreloop;
5223 smtp_log_no_mail(); /* Log no mail if configured */
5224 exim_exit(EXIT_FAILURE, US"receive toplevel");
5229 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5230 smtp_log_no_mail(); /* Log no mail if configured */
5231 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5235 /* In the non-SMTP case, we have all the information from the command
5236 line, but must process it in case it is in the more general RFC822
5237 format, and in any case, to detect syntax errors. Also, it appears that
5238 the use of comma-separated lists as single arguments is common, so we
5239 had better support them. */
5244 int count = argc - recipients_arg;
5245 uschar **list = argv + recipients_arg;
5247 /* These options cannot be changed dynamically for non-SMTP messages */
5249 f.active_local_sender_retain = local_sender_retain;
5250 f.active_local_from_check = local_from_check;
5252 /* Save before any rewriting */
5254 raw_sender = string_copy(sender_address);
5256 /* Loop for each argument */
5258 for (int i = 0; i < count; i++)
5260 int start, end, domain;
5262 uschar *s = list[i];
5264 /* Loop for each comma-separated address */
5268 BOOL finished = FALSE;
5270 uschar *ss = parse_find_address_end(s, FALSE);
5272 if (*ss == ',') *ss = 0; else finished = TRUE;
5274 /* Check max recipients - if -t was used, these aren't recipients */
5276 if (recipients_max > 0 && ++rcount > recipients_max &&
5277 !extract_recipients)
5278 if (error_handling == ERRORS_STDERR)
5280 fprintf(stderr, "exim: too many recipients\n");
5281 exim_exit(EXIT_FAILURE, US"main");
5285 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5286 errors_sender_rc : EXIT_FAILURE;
5290 BOOL b = allow_utf8_domains;
5291 allow_utf8_domains = TRUE;
5294 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5297 if (string_is_utf8(recipient))
5298 message_smtputf8 = TRUE;
5300 allow_utf8_domains = b;
5303 if (domain == 0 && !f.allow_unqualified_recipient)
5306 errmess = US"unqualified recipient address not allowed";
5309 if (recipient == NULL)
5311 if (error_handling == ERRORS_STDERR)
5313 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5314 string_printing(list[i]), errmess);
5315 exim_exit(EXIT_FAILURE, US"main");
5321 eblock.text1 = string_printing(list[i]);
5322 eblock.text2 = errmess;
5324 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5325 errors_sender_rc : EXIT_FAILURE;
5329 receive_add_recipient(recipient, -1);
5332 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5336 /* Show the recipients when debugging */
5340 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5341 if (recipients_list != NULL)
5343 debug_printf("Recipients:\n");
5344 for (int i = 0; i < recipients_count; i++)
5345 debug_printf(" %s\n", recipients_list[i].address);
5349 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5350 ignored; rejecting here would just add complication, and it can just as
5351 well be done later. Allow $recipients to be visible in the ACL. */
5353 if (acl_not_smtp_start)
5355 uschar *user_msg, *log_msg;
5356 f.enable_dollar_recipients = TRUE;
5357 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5358 &user_msg, &log_msg);
5359 f.enable_dollar_recipients = FALSE;
5362 /* Pause for a while waiting for input. If none received in that time,
5363 close the logfile, if we had one open; then if we wait for a long-running
5364 datasource (months, in one use-case) log rotation will not leave us holding
5367 if (!receive_timeout)
5369 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5372 FD_ZERO(&r); FD_SET(0, &r);
5373 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5376 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5377 will just read the headers for the message, and not write anything onto the
5380 message_ended = END_NOTENDED;
5381 more = receive_msg(extract_recipients);
5383 /* more is always FALSE here (not SMTP message) when reading a message
5384 for real; when reading the headers of a message for filter testing,
5385 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5387 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5388 } /* Non-SMTP message reception */
5390 /* If this is a filter testing run, there are headers in store, but
5391 no message on the spool. Run the filtering code in testing mode, setting
5392 the domain to the qualify domain and the local part to the current user,
5393 unless they have been set by options. The prefix and suffix are left unset
5394 unless specified. The the return path is set to to the sender unless it has
5395 already been set from a return-path header in the message. */
5397 if (filter_test != FTEST_NONE)
5399 deliver_domain = (ftest_domain != NULL)?
5400 ftest_domain : qualify_domain_recipient;
5401 deliver_domain_orig = deliver_domain;
5402 deliver_localpart = (ftest_localpart != NULL)?
5403 ftest_localpart : originator_login;
5404 deliver_localpart_orig = deliver_localpart;
5405 deliver_localpart_prefix = ftest_prefix;
5406 deliver_localpart_suffix = ftest_suffix;
5407 deliver_home = originator_home;
5409 if (return_path == NULL)
5411 printf("Return-path copied from sender\n");
5412 return_path = string_copy(sender_address);
5415 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5416 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5418 receive_add_recipient(
5419 string_sprintf("%s%s%s@%s",
5420 (ftest_prefix == NULL)? US"" : ftest_prefix,
5422 (ftest_suffix == NULL)? US"" : ftest_suffix,
5423 deliver_domain), -1);
5425 printf("Recipient = %s\n", recipients_list[0].address);
5426 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5427 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5429 if (chdir("/")) /* Get away from wherever the user is running this from */
5431 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5432 exim_exit(EXIT_FAILURE, US"main");
5435 /* Now we run either a system filter test, or a user filter test, or both.
5436 In the latter case, headers added by the system filter will persist and be
5437 available to the user filter. We need to copy the filter variables
5440 if ((filter_test & FTEST_SYSTEM) != 0)
5441 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5442 exim_exit(EXIT_FAILURE, US"main");
5444 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5446 if ((filter_test & FTEST_USER) != 0)
5447 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5448 exim_exit(EXIT_FAILURE, US"main");
5450 exim_exit(EXIT_SUCCESS, US"main");
5453 /* Else act on the result of message reception. We should not get here unless
5454 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5455 will be TRUE. If it is not, check on the number of messages received in this
5458 if (!session_local_queue_only &&
5459 smtp_accept_queue_per_connection > 0 &&
5460 receive_messagecount > smtp_accept_queue_per_connection)
5462 session_local_queue_only = TRUE;
5463 queue_only_reason = 2;
5466 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5467 and queue_only_load is set, check that the load average is below it. If it is
5468 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5469 default), we put the whole session into queue_only mode. It then remains this
5470 way for any subsequent messages on the same SMTP connection. This is a
5471 deliberate choice; even though the load average may fall, it doesn't seem
5472 right to deliver later messages on the same call when not delivering earlier
5473 ones. However, there are odd cases where this is not wanted, so this can be
5474 changed by setting queue_only_load_latch false. */
5476 local_queue_only = session_local_queue_only;
5477 if (!local_queue_only && queue_only_load >= 0)
5479 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5480 if (local_queue_only)
5482 queue_only_reason = 3;
5483 if (queue_only_load_latch) session_local_queue_only = TRUE;
5487 /* If running as an MUA wrapper, all queueing options and freezing options
5491 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5493 /* Log the queueing here, when it will get a message id attached, but
5494 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5497 if (local_queue_only)
5499 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5500 switch(queue_only_reason)
5503 log_write(L_delay_delivery,
5504 LOG_MAIN, "no immediate delivery: more than %d messages "
5505 "received in one connection", smtp_accept_queue_per_connection);
5509 log_write(L_delay_delivery,
5510 LOG_MAIN, "no immediate delivery: load average %.2f",
5511 (double)load_average/1000.0);
5516 else if (f.queue_only_policy || f.deliver_freeze)
5517 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5519 /* Else do the delivery unless the ACL or local_scan() called for queue only
5520 or froze the message. Always deliver in a separate process. A fork failure is
5521 not a disaster, as the delivery will eventually happen on a subsequent queue
5522 run. The search cache must be tidied before the fork, as the parent will
5523 do it before exiting. The child will trigger a lookup failure and
5524 thereby defer the delivery if it tries to use (for example) a cached ldap
5525 connection that the parent has called unbind on. */
5532 if ((pid = fork()) == 0)
5535 close_unwanted(); /* Close unwanted file descriptors and TLS */
5536 exim_nullstd(); /* Ensure std{in,out,err} exist */
5538 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5539 mode, deliver_drop_privilege is forced TRUE). */
5541 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5543 delivery_re_exec(CEE_EXEC_EXIT);
5544 /* Control does not return here. */
5547 /* No need to re-exec */
5549 rc = deliver_message(message_id, FALSE, FALSE);
5551 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5552 EXIT_SUCCESS : EXIT_FAILURE);
5557 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5558 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5559 "process: %s", strerror(errno));
5563 release_cutthrough_connection(US"msg passed for delivery");
5565 /* In the parent, wait if synchronous delivery is required. This will
5566 always be the case in MUA wrapper mode. */
5568 if (f.synchronous_delivery)
5571 while (wait(&status) != pid);
5572 if ((status & 0x00ff) != 0)
5573 log_write(0, LOG_MAIN|LOG_PANIC,
5574 "process %d crashed with signal %d while delivering %s",
5575 (int)pid, status & 0x00ff, message_id);
5576 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5581 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5582 automatically reaps children (see comments above the loop), clear away any
5583 finished subprocesses here, in case there are lots of messages coming in
5584 from the same source. */
5586 #ifndef SIG_IGN_WORKS
5587 while (waitpid(-1, NULL, WNOHANG) > 0);
5591 return_path = sender_address = NULL;
5592 authenticated_sender = NULL;
5593 deliver_localpart_orig = NULL;
5594 deliver_domain_orig = NULL;
5595 deliver_host = deliver_host_address = NULL;
5596 dnslist_domain = dnslist_matched = NULL;
5597 #ifdef WITH_CONTENT_SCAN
5598 malware_name = NULL;
5600 callout_address = NULL;
5601 sending_ip_address = NULL;
5603 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5605 store_reset(reset_point);
5608 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5609 return 0; /* To stop compiler warning */