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);
476 /*************************************************
477 * Ensure stdin, stdout, and stderr exist *
478 *************************************************/
480 /* Some operating systems grumble if an exec() happens without a standard
481 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
482 file will be opened and will use these fd values, and then some other bit of
483 code will assume, for example, that it can write error messages to stderr.
484 This function ensures that fds 0, 1, and 2 are open if they do not already
485 exist, by connecting them to /dev/null.
487 This function is also used to ensure that std{in,out,err} exist at all times,
488 so that if any library that Exim calls tries to use them, it doesn't crash.
499 for (int i = 0; i <= 2; i++)
501 if (fstat(i, &statbuf) < 0 && errno == EBADF)
503 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
504 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
505 string_open_failed(errno, "/dev/null"));
506 if (devnull != i) (void)dup2(devnull, i);
509 if (devnull > 2) (void)close(devnull);
515 /*************************************************
516 * Close unwanted file descriptors for delivery *
517 *************************************************/
519 /* This function is called from a new process that has been forked to deliver
520 an incoming message, either directly, or using exec.
522 We want any smtp input streams to be closed in this new process. However, it
523 has been observed that using fclose() here causes trouble. When reading in -bS
524 input, duplicate copies of messages have been seen. The files will be sharing a
525 file pointer with the parent process, and it seems that fclose() (at least on
526 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
527 least sometimes. Hence we go for closing the underlying file descriptors.
529 If TLS is active, we want to shut down the TLS library, but without molesting
530 the parent's SSL connection.
532 For delivery of a non-SMTP message, we want to close stdin and stdout (and
533 stderr unless debugging) because the calling process might have set them up as
534 pipes and be waiting for them to close before it waits for the submission
535 process to terminate. If they aren't closed, they hold up the calling process
536 until the initial delivery process finishes, which is not what we want.
538 Exception: We do want it for synchronous delivery!
540 And notwithstanding all the above, if D_resolver is set, implying resolver
541 debugging, leave stdout open, because that's where the resolver writes its
544 When we close stderr (which implies we've also closed stdout), we also get rid
545 of any controlling terminal.
557 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
559 (void)close(fileno(smtp_in));
560 (void)close(fileno(smtp_out));
565 (void)close(0); /* stdin */
566 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
567 if (debug_selector == 0) /* stderr */
569 if (!f.synchronous_delivery)
582 /*************************************************
584 *************************************************/
586 /* This function sets a new uid and gid permanently, optionally calling
587 initgroups() to set auxiliary groups. There are some special cases when running
588 Exim in unprivileged modes. In these situations the effective uid will not be
589 root; if we already have the right effective uid/gid, and don't need to
590 initialize any groups, leave things as they are.
595 igflag TRUE if initgroups() wanted
596 msg text to use in debugging output and failure log
598 Returns: nothing; bombs out on failure
602 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
604 uid_t euid = geteuid();
605 gid_t egid = getegid();
607 if (euid == root_uid || euid != uid || egid != gid || igflag)
609 /* At least one OS returns +1 for initgroups failure, so just check for
614 struct passwd *pw = getpwuid(uid);
616 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
617 "no passwd entry for uid=%ld", (long int)uid);
619 if (initgroups(pw->pw_name, gid) != 0)
620 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
621 (long int)uid, strerror(errno));
624 if (setgid(gid) < 0 || setuid(uid) < 0)
625 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
626 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
629 /* Debugging output included uid/gid and all groups */
633 int group_count, save_errno;
634 gid_t group_list[EXIM_GROUPLIST_SIZE];
635 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
636 (long int)geteuid(), (long int)getegid(), (long int)getpid());
637 group_count = getgroups(nelem(group_list), group_list);
639 debug_printf(" auxiliary group list:");
641 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
642 else if (group_count < 0)
643 debug_printf(" <error: %s>", strerror(save_errno));
644 else debug_printf(" <none>");
652 /*************************************************
654 *************************************************/
656 /* Exim exits via this function so that it always clears up any open
662 Returns: does not return
666 exim_exit(int rc, const uschar * process)
670 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
671 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
672 process ? "(" : "", process, process ? ") " : "", rc);
678 /* Print error string, then die */
680 exim_fail(const char * fmt, ...)
684 vfprintf(stderr, fmt, ap);
688 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
689 of chown()/fchown(). See src/functions.h for more explanation */
691 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
693 int saved_errno = errno; /* from the preceeding chown call */
695 log_write(0, LOG_MAIN|LOG_PANIC,
696 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
697 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
698 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
700 /* I leave this here, commented, in case the "bug"(?) comes up again.
701 It is not an Exim bug, but we can provide a workaround.
707 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
709 if (buf.st_uid == owner && buf.st_gid == group) return 0;
710 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
712 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
720 /*************************************************
721 * Extract port from host address *
722 *************************************************/
724 /* Called to extract the port from the values given to -oMa and -oMi.
725 It also checks the syntax of the address, and terminates it before the
726 port data when a port is extracted.
729 address the address, with possible port on the end
731 Returns: the port, or zero if there isn't one
732 bombs out on a syntax error
736 check_port(uschar *address)
738 int port = host_address_extract_port(address);
739 if (string_is_ip_address(address, NULL) == 0)
740 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
746 /*************************************************
747 * Test/verify an address *
748 *************************************************/
750 /* This function is called by the -bv and -bt code. It extracts a working
751 address from a full RFC 822 address. This isn't really necessary per se, but it
752 has the effect of collapsing source routes.
756 flags flag bits for verify_address()
757 exit_value to be set for failures
763 test_address(uschar *s, int flags, int *exit_value)
765 int start, end, domain;
766 uschar *parse_error = NULL;
767 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
771 fprintf(stdout, "syntax error: %s\n", parse_error);
776 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
777 -1, -1, NULL, NULL, NULL);
778 if (rc == FAIL) *exit_value = 2;
779 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
785 /*************************************************
786 * Show supported features *
787 *************************************************/
790 show_db_version(FILE * f)
792 #ifdef DB_VERSION_STRING
795 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
796 fprintf(f, " Runtime: %s\n",
797 db_version(NULL, NULL, NULL));
800 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
802 #elif defined(BTREEVERSION) && defined(HASHVERSION)
804 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
806 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
809 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
810 fprintf(f, "Probably ndbm\n");
811 #elif defined(USE_TDB)
812 fprintf(f, "Using tdb\n");
815 fprintf(f, "Probably GDBM (native mode)\n");
817 fprintf(f, "Probably GDBM (compatibility mode)\n");
823 /* This function is called for -bV/--version and for -d to output the optional
824 features of the current Exim binary.
826 Arguments: a FILE for printing
831 show_whats_supported(FILE * fp)
833 DEBUG(D_any) {} else show_db_version(fp);
835 fprintf(fp, "Support for:");
836 #ifdef SUPPORT_CRYPTEQ
837 fprintf(fp, " crypteq");
840 fprintf(fp, " iconv()");
843 fprintf(fp, " IPv6");
845 #ifdef HAVE_SETCLASSRESOURCES
846 fprintf(fp, " use_setclassresources");
852 fprintf(fp, " Perl");
855 fprintf(fp, " Expand_dlfunc");
857 #ifdef USE_TCP_WRAPPERS
858 fprintf(fp, " TCPwrappers");
862 fprintf(fp, " GnuTLS");
864 fprintf(fp, " OpenSSL");
867 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
868 fprintf(fp, " translate_ip_address");
870 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
871 fprintf(fp, " move_frozen_messages");
873 #ifdef WITH_CONTENT_SCAN
874 fprintf(fp, " Content_Scanning");
877 fprintf(fp, " DANE");
880 fprintf(fp, " DKIM");
882 #ifndef DISABLE_DNSSEC
883 fprintf(fp, " DNSSEC");
885 #ifndef DISABLE_EVENT
886 fprintf(fp, " Event");
889 fprintf(fp, " I18N");
892 fprintf(fp, " OCSP");
895 fprintf(fp, " PRDR");
898 fprintf(fp, " PROXY");
901 fprintf(fp, " SOCKS");
908 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
910 #ifdef EXPERIMENTAL_LMDB
911 fprintf(fp, " Experimental_LMDB");
913 #ifdef EXPERIMENTAL_QUEUEFILE
914 fprintf(fp, " Experimental_QUEUEFILE");
916 #ifdef EXPERIMENTAL_SRS
917 fprintf(fp, " Experimental_SRS");
919 #ifdef EXPERIMENTAL_ARC
920 fprintf(fp, " Experimental_ARC");
922 #ifdef EXPERIMENTAL_BRIGHTMAIL
923 fprintf(fp, " Experimental_Brightmail");
925 #ifdef EXPERIMENTAL_DCC
926 fprintf(fp, " Experimental_DCC");
928 #ifdef EXPERIMENTAL_DMARC
929 fprintf(fp, " Experimental_DMARC");
931 #ifdef EXPERIMENTAL_DSN_INFO
932 fprintf(fp, " Experimental_DSN_info");
934 #ifdef EXPERIMENTAL_PIPE_CONNECT
935 fprintf(fp, " Experimental_PIPE_CONNECT");
939 fprintf(fp, "Lookups (built-in):");
940 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
941 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
943 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
946 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
947 fprintf(fp, " dbm dbmjz dbmnz");
949 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
950 fprintf(fp, " dnsdb");
952 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
953 fprintf(fp, " dsearch");
955 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
956 fprintf(fp, " ibase");
958 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
959 fprintf(fp, " json");
961 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
962 fprintf(fp, " ldap ldapdn ldapm");
964 #ifdef EXPERIMENTAL_LMDB
965 fprintf(fp, " lmdb");
967 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
968 fprintf(fp, " mysql");
970 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
971 fprintf(fp, " nis nis0");
973 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
974 fprintf(fp, " nisplus");
976 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
977 fprintf(fp, " oracle");
979 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
980 fprintf(fp, " passwd");
982 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
983 fprintf(fp, " pgsql");
985 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
986 fprintf(fp, " redis");
988 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
989 fprintf(fp, " sqlite");
991 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
992 fprintf(fp, " testdb");
994 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
995 fprintf(fp, " whoson");
999 auth_show_supported(fp);
1000 route_show_supported(fp);
1001 transport_show_supported(fp);
1003 #ifdef WITH_CONTENT_SCAN
1004 malware_show_supported(fp);
1007 if (fixed_never_users[0] > 0)
1010 fprintf(fp, "Fixed never_users: ");
1011 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1012 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
1013 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
1016 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
1018 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1020 /* Everything else is details which are only worth reporting when debugging.
1021 Perhaps the tls_version_report should move into this too. */
1024 /* clang defines __GNUC__ (at least, for me) so test for it first */
1025 #if defined(__clang__)
1026 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1027 #elif defined(__GNUC__)
1028 fprintf(fp, "Compiler: GCC [%s]\n",
1032 "? unknown version ?"
1036 fprintf(fp, "Compiler: <unknown>\n");
1039 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1040 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1041 __GLIBC__, __GLIBC_MINOR__);
1042 if (__GLIBC_PREREQ(2, 1))
1043 fprintf(fp, " Runtime: %s\n",
1044 gnu_get_libc_version());
1047 show_db_version(fp);
1050 tls_version_report(fp);
1053 utf8_version_report(fp);
1056 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1057 if (authi->version_report)
1058 (*authi->version_report)(fp);
1060 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1061 characters; unless it's an ancient version of PCRE in which case it
1063 #ifndef PCRE_PRERELEASE
1064 # define PCRE_PRERELEASE
1067 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1068 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1070 PCRE_MAJOR, PCRE_MINOR,
1071 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1074 #undef EXPAND_AND_QUOTE
1077 for (int i = 0; i < lookup_list_count; i++)
1078 if (lookup_list[i]->version_report)
1079 lookup_list[i]->version_report(fp);
1081 #ifdef WHITELIST_D_MACROS
1082 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1084 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1086 #ifdef TRUSTED_CONFIG_LIST
1087 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1089 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1096 /*************************************************
1097 * Show auxiliary information about Exim *
1098 *************************************************/
1101 show_exim_information(enum commandline_info request, FILE *stream)
1106 fprintf(stream, "Oops, something went wrong.\n");
1110 "The -bI: flag takes a string indicating which information to provide.\n"
1111 "If the string is not recognised, you'll get this help (on stderr).\n"
1113 " exim -bI:help this information\n"
1114 " exim -bI:dscp list of known dscp value keywords\n"
1115 " exim -bI:sieve list of supported sieve extensions\n"
1119 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1120 fprintf(stream, "%s\n", *pp);
1123 dscp_list_to_stream(stream);
1129 /*************************************************
1130 * Quote a local part *
1131 *************************************************/
1133 /* This function is used when a sender address or a From: or Sender: header
1134 line is being created from the caller's login, or from an authenticated_id. It
1135 applies appropriate quoting rules for a local part.
1137 Argument: the local part
1138 Returns: the local part, quoted if necessary
1142 local_part_quote(uschar *lpart)
1144 BOOL needs_quote = FALSE;
1147 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1149 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1150 (*t != '.' || t == lpart || t[1] == 0);
1153 if (!needs_quote) return lpart;
1155 g = string_catn(NULL, US"\"", 1);
1159 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1162 g = string_cat(g, lpart);
1165 g = string_catn(g, lpart, nq - lpart);
1166 g = string_catn(g, US"\\", 1);
1167 g = string_catn(g, nq, 1);
1171 g = string_catn(g, US"\"", 1);
1172 return string_from_gstring(g);
1178 /*************************************************
1179 * Load readline() functions *
1180 *************************************************/
1182 /* This function is called from testing executions that read data from stdin,
1183 but only when running as the calling user. Currently, only -be does this. The
1184 function loads the readline() function library and passes back the functions.
1185 On some systems, it needs the curses library, so load that too, but try without
1186 it if loading fails. All this functionality has to be requested at build time.
1189 fn_readline_ptr pointer to where to put the readline pointer
1190 fn_addhist_ptr pointer to where to put the addhistory function
1192 Returns: the dlopen handle or NULL on failure
1196 set_readline(char * (**fn_readline_ptr)(const char *),
1197 void (**fn_addhist_ptr)(const char *))
1200 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1202 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1203 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1205 if (dlhandle != NULL)
1207 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1208 * char * readline (const char *prompt);
1209 * void add_history (const char *string);
1211 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1212 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1216 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1225 /*************************************************
1226 * Get a line from stdin for testing things *
1227 *************************************************/
1229 /* This function is called when running tests that can take a number of lines
1230 of input (for example, -be and -bt). It handles continuations and trailing
1231 spaces. And prompting and a blank line output on eof. If readline() is in use,
1232 the arguments are non-NULL and provide the relevant functions.
1235 fn_readline readline function or NULL
1236 fn_addhist addhist function or NULL
1238 Returns: pointer to dynamic memory, or NULL at end of file
1242 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1246 if (!fn_readline) { printf("> "); fflush(stdout); }
1248 for (int i = 0;; i++)
1250 uschar buffer[1024];
1254 char *readline_line = NULL;
1255 if (fn_readline != NULL)
1257 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1258 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1259 p = US readline_line;
1264 /* readline() not in use */
1267 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1271 /* Handle the line */
1273 ss = p + (int)Ustrlen(p);
1274 while (ss > p && isspace(ss[-1])) ss--;
1278 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1281 g = string_catn(g, p, ss - p);
1284 if (fn_readline) free(readline_line);
1287 /* g can only be NULL if ss==p */
1288 if (ss == p || g->s[g->ptr-1] != '\\')
1292 (void) string_from_gstring(g);
1295 if (!g) printf("\n");
1296 return string_from_gstring(g);
1301 /*************************************************
1302 * Output usage information for the program *
1303 *************************************************/
1305 /* This function is called when there are no recipients
1306 or a specific --help argument was added.
1309 progname information on what name we were called by
1311 Returns: DOES NOT RETURN
1315 exim_usage(uschar *progname)
1318 /* Handle specific program invocation variants */
1319 if (Ustrcmp(progname, US"-mailq") == 0)
1321 "mailq - list the contents of the mail queue\n\n"
1322 "For a list of options, see the Exim documentation.\n");
1324 /* Generic usage - we output this whatever happens */
1326 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1327 "not directly from a shell command line. Options and/or arguments control\n"
1328 "what it does when called. For a list of options, see the Exim documentation.\n");
1333 /*************************************************
1334 * Validate that the macros given are okay *
1335 *************************************************/
1337 /* Typically, Exim will drop privileges if macros are supplied. In some
1338 cases, we want to not do so.
1340 Arguments: opt_D_used - true if the commandline had a "-D" option
1341 Returns: true if trusted, false otherwise
1345 macros_trusted(BOOL opt_D_used)
1347 #ifdef WHITELIST_D_MACROS
1348 uschar *whitelisted, *end, *p, **whites;
1349 int white_count, i, n;
1351 BOOL prev_char_item, found;
1356 #ifndef WHITELIST_D_MACROS
1360 /* We only trust -D overrides for some invoking users:
1361 root, the exim run-time user, the optional config owner user.
1362 I don't know why config-owner would be needed, but since they can own the
1363 config files anyway, there's no security risk to letting them override -D. */
1364 if ( ! ((real_uid == root_uid)
1365 || (real_uid == exim_uid)
1366 #ifdef CONFIGURE_OWNER
1367 || (real_uid == config_uid)
1371 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1375 /* Get a list of macros which are whitelisted */
1376 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1377 prev_char_item = FALSE;
1379 for (p = whitelisted; *p != '\0'; ++p)
1381 if (*p == ':' || isspace(*p))
1386 prev_char_item = FALSE;
1389 if (!prev_char_item)
1390 prev_char_item = TRUE;
1397 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1398 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1403 if (i == white_count)
1405 while (*p != '\0' && p < end)
1411 /* The list of commandline macros should be very short.
1412 Accept the N*M complexity. */
1413 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1416 for (uschar ** w = whites; *w; ++w)
1417 if (Ustrcmp(*w, m->name) == 0)
1424 if (!m->replacement)
1426 if ((len = m->replen) == 0)
1428 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1429 0, PCRE_EOPT, NULL, 0);
1432 if (n != PCRE_ERROR_NOMATCH)
1433 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1437 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1443 /*************************************************
1444 * Expansion testing *
1445 *************************************************/
1447 /* Expand and print one item, doing macro-processing.
1450 item line for expansion
1454 expansion_test_line(uschar * line)
1459 Ustrncpy(big_buffer, line, big_buffer_size);
1460 big_buffer[big_buffer_size-1] = '\0';
1461 len = Ustrlen(big_buffer);
1463 (void) macros_expand(0, &len, &dummy_macexp);
1465 if (isupper(big_buffer[0]))
1467 if (macro_read_assignment(big_buffer))
1468 printf("Defined macro '%s'\n", mlast->name);
1471 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1472 else printf("Failed: %s\n", expand_string_message);
1477 /*************************************************
1478 * Entry point and high-level code *
1479 *************************************************/
1481 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1482 the appropriate action. All the necessary functions are present in the one
1483 binary. I originally thought one should split it up, but it turns out that so
1484 much of the apparatus is needed in each chunk that one might as well just have
1485 it all available all the time, which then makes the coding easier as well.
1488 argc count of entries in argv
1489 argv argument strings, with argv[0] being the program name
1491 Returns: EXIT_SUCCESS if terminated successfully
1492 EXIT_FAILURE otherwise, except when a message has been sent
1493 to the sender, and -oee was given
1497 main(int argc, char **cargv)
1499 uschar **argv = USS cargv;
1500 int arg_receive_timeout = -1;
1501 int arg_smtp_receive_timeout = -1;
1502 int arg_error_handling = error_handling;
1503 int filter_sfd = -1;
1504 int filter_ufd = -1;
1507 int list_queue_option = 0;
1509 int msg_action_arg = -1;
1510 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1511 int queue_only_reason = 0;
1513 int perl_start_option = 0;
1515 int recipients_arg = argc;
1516 int sender_address_domain = 0;
1517 int test_retry_arg = -1;
1518 int test_rewrite_arg = -1;
1519 gid_t original_egid;
1520 BOOL arg_queue_only = FALSE;
1521 BOOL bi_option = FALSE;
1522 BOOL checking = FALSE;
1523 BOOL count_queue = FALSE;
1524 BOOL expansion_test = FALSE;
1525 BOOL extract_recipients = FALSE;
1526 BOOL flag_G = FALSE;
1527 BOOL flag_n = FALSE;
1528 BOOL forced_delivery = FALSE;
1529 BOOL f_end_dot = FALSE;
1530 BOOL deliver_give_up = FALSE;
1531 BOOL list_queue = FALSE;
1532 BOOL list_options = FALSE;
1533 BOOL list_config = FALSE;
1534 BOOL local_queue_only;
1536 BOOL one_msg_action = FALSE;
1537 BOOL opt_D_used = FALSE;
1538 BOOL queue_only_set = FALSE;
1539 BOOL receiving_message = TRUE;
1540 BOOL sender_ident_set = FALSE;
1541 BOOL session_local_queue_only;
1543 BOOL removed_privilege = FALSE;
1544 BOOL usage_wanted = FALSE;
1545 BOOL verify_address_mode = FALSE;
1546 BOOL verify_as_sender = FALSE;
1547 BOOL version_printed = FALSE;
1548 uschar *alias_arg = NULL;
1549 uschar *called_as = US"";
1550 uschar *cmdline_syslog_name = NULL;
1551 uschar *start_queue_run_id = NULL;
1552 uschar *stop_queue_run_id = NULL;
1553 uschar *expansion_test_message = NULL;
1554 uschar *ftest_domain = NULL;
1555 uschar *ftest_localpart = NULL;
1556 uschar *ftest_prefix = NULL;
1557 uschar *ftest_suffix = NULL;
1558 uschar *log_oneline = NULL;
1559 uschar *malware_test_file = NULL;
1560 uschar *real_sender_address;
1561 uschar *originator_home = US"/";
1566 struct stat statbuf;
1567 pid_t passed_qr_pid = (pid_t)0;
1568 int passed_qr_pipe = -1;
1569 gid_t group_list[EXIM_GROUPLIST_SIZE];
1571 /* For the -bI: flag */
1572 enum commandline_info info_flag = CMDINFO_NONE;
1573 BOOL info_stdout = FALSE;
1575 /* Possible options for -R and -S */
1577 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1579 /* Need to define this in case we need to change the environment in order
1580 to get rid of a bogus time zone. We have to make it char rather than uschar
1581 because some OS define it in /usr/include/unistd.h. */
1583 extern char **environ;
1585 /* If the Exim user and/or group and/or the configuration file owner/group were
1586 defined by ref:name at build time, we must now find the actual uid/gid values.
1587 This is a feature to make the lives of binary distributors easier. */
1589 #ifdef EXIM_USERNAME
1590 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1593 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1595 /* If ref:name uses a number as the name, route_finduser() returns
1596 TRUE with exim_uid set and pw coerced to NULL. */
1598 exim_gid = pw->pw_gid;
1599 #ifndef EXIM_GROUPNAME
1602 "exim: ref:name should specify a usercode, not a group.\n"
1603 "exim: can't let you get away with it unless you also specify a group.\n");
1607 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1610 #ifdef EXIM_GROUPNAME
1611 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1612 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1615 #ifdef CONFIGURE_OWNERNAME
1616 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1617 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1618 CONFIGURE_OWNERNAME);
1621 /* We default the system_filter_user to be the Exim run-time user, as a
1622 sane non-root value. */
1623 system_filter_uid = exim_uid;
1625 #ifdef CONFIGURE_GROUPNAME
1626 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1627 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1628 CONFIGURE_GROUPNAME);
1631 /* In the Cygwin environment, some initialization used to need doing.
1632 It was fudged in by means of this macro; now no longer but we'll leave
1633 it in case of others. */
1639 /* Check a field which is patched when we are running Exim within its
1640 testing harness; do a fast initial check, and then the whole thing. */
1642 f.running_in_test_harness =
1643 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1644 if (f.running_in_test_harness)
1647 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1648 at the start of a program; however, it seems that some environments do not
1649 follow this. A "strange" locale can affect the formatting of timestamps, so we
1652 setlocale(LC_ALL, "C");
1654 /* Set up the default handler for timing using alarm(). */
1656 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1658 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1659 because store_malloc writes a log entry on failure. */
1661 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1662 exim_fail("exim: failed to get store for log buffer\n");
1664 /* Initialize the default log options. */
1666 bits_set(log_selector, log_selector_size, log_default);
1668 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1669 NULL when the daemon is run and the file is closed. We have to use this
1670 indirection, because some systems don't allow writing to the variable "stderr".
1673 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1675 /* Arrange for the PCRE regex library to use our store functions. Note that
1676 the normal calls are actually macros that add additional arguments for
1677 debugging purposes so we have to assign specially constructed functions here.
1678 The default is to use store in the stacking pool, but this is overridden in the
1679 regex_must_compile() function. */
1681 pcre_malloc = function_store_get;
1682 pcre_free = function_dummy_free;
1684 /* Ensure there is a big buffer for temporary use in several places. It is put
1685 in malloc store so that it can be freed for enlargement if necessary. */
1687 big_buffer = store_malloc(big_buffer_size);
1689 /* Set up the handler for the data request signal, and set the initial
1690 descriptive text. */
1692 set_process_info("initializing");
1693 os_restarting_signal(SIGUSR1, usr1_handler);
1695 /* If running in a dockerized environment, the TERM signal is only
1696 delegated to the PID 1 if we request it by setting an signal handler */
1697 if (getpid() == 1) signal(SIGTERM, term_handler);
1699 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1700 in the daemon code. For the rest of Exim's uses, we ignore it. */
1702 signal(SIGHUP, SIG_IGN);
1704 /* We don't want to die on pipe errors as the code is written to handle
1705 the write error instead. */
1707 signal(SIGPIPE, SIG_IGN);
1709 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1710 set to SIG_IGN. This causes subprocesses that complete before the parent
1711 process waits for them not to hang around, so when Exim calls wait(), nothing
1712 is there. The wait() code has been made robust against this, but let's ensure
1713 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1714 ending status. We use sigaction rather than plain signal() on those OS where
1715 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1716 problem on AIX with this.) */
1720 struct sigaction act;
1721 act.sa_handler = SIG_DFL;
1722 sigemptyset(&(act.sa_mask));
1724 sigaction(SIGCHLD, &act, NULL);
1727 signal(SIGCHLD, SIG_DFL);
1730 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1735 /* Set up the version number. Set up the leading 'E' for the external form of
1736 message ids, set the pointer to the internal form, and initialize it to
1737 indicate no message being processed. */
1740 message_id_option[0] = '-';
1741 message_id_external = message_id_option + 1;
1742 message_id_external[0] = 'E';
1743 message_id = message_id_external + 1;
1746 /* Set the umask to zero so that any files Exim creates using open() are
1747 created with the modes that it specifies. NOTE: Files created with fopen() have
1748 a problem, which was not recognized till rather late (February 2006). With this
1749 umask, such files will be world writeable. (They are all content scanning files
1750 in the spool directory, which isn't world-accessible, so this is not a
1751 disaster, but it's untidy.) I don't want to change this overall setting,
1752 however, because it will interact badly with the open() calls. Instead, there's
1753 now a function called modefopen() that fiddles with the umask while calling
1758 /* Precompile the regular expression for matching a message id. Keep this in
1759 step with the code that generates ids in the accept.c module. We need to do
1760 this here, because the -M options check their arguments for syntactic validity
1761 using mac_ismsgid, which uses this. */
1764 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1766 /* Precompile the regular expression that is used for matching an SMTP error
1767 code, possibly extended, at the start of an error message. Note that the
1768 terminating whitespace character is included. */
1771 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1774 #ifdef WHITELIST_D_MACROS
1775 /* Precompile the regular expression used to filter the content of macros
1776 given to -D for permissibility. */
1778 regex_whitelisted_macro =
1779 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1782 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1784 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1785 this seems to be a generally accepted convention, since one finds symbolic
1786 links called "mailq" in standard OS configurations. */
1788 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1789 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1792 receiving_message = FALSE;
1793 called_as = US"-mailq";
1796 /* If the program is called as "rmail" treat it as equivalent to
1797 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1798 i.e. preventing a single dot on a line from terminating the message, and
1799 returning with zero return code, even in cases of error (provided an error
1800 message has been sent). */
1802 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1803 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1806 called_as = US"-rmail";
1807 errors_sender_rc = EXIT_SUCCESS;
1810 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1811 this is a smail convention. */
1813 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1814 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1816 smtp_input = smtp_batched_input = TRUE;
1817 called_as = US"-rsmtp";
1820 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1821 this is a smail convention. */
1823 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1824 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1827 receiving_message = FALSE;
1828 called_as = US"-runq";
1831 /* If the program is called as "newaliases" treat it as equivalent to
1832 "exim -bi"; this is a sendmail convention. */
1834 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1835 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1838 receiving_message = FALSE;
1839 called_as = US"-newaliases";
1842 /* Save the original effective uid for a couple of uses later. It should
1843 normally be root, but in some esoteric environments it may not be. */
1845 original_euid = geteuid();
1846 original_egid = getegid();
1848 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1849 to be the same as the real ones. This makes a difference only if Exim is setuid
1850 (or setgid) to something other than root, which could be the case in some
1851 special configurations. */
1853 real_uid = getuid();
1854 real_gid = getgid();
1856 if (real_uid == root_uid)
1858 if ((rv = setgid(real_gid)))
1859 exim_fail("exim: setgid(%ld) failed: %s\n",
1860 (long int)real_gid, strerror(errno));
1861 if ((rv = setuid(real_uid)))
1862 exim_fail("exim: setuid(%ld) failed: %s\n",
1863 (long int)real_uid, strerror(errno));
1866 /* If neither the original real uid nor the original euid was root, Exim is
1867 running in an unprivileged state. */
1869 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1871 /* Scan the program's arguments. Some can be dealt with right away; others are
1872 simply recorded for checking and handling afterwards. Do a high-level switch
1873 on the second character (the one after '-'), to save some effort. */
1875 for (i = 1; i < argc; i++)
1877 BOOL badarg = FALSE;
1878 uschar *arg = argv[i];
1882 /* An argument not starting with '-' is the start of a recipients list;
1883 break out of the options-scanning loop. */
1891 /* An option consisting of -- terminates the options */
1893 if (Ustrcmp(arg, "--") == 0)
1895 recipients_arg = i + 1;
1899 /* Handle flagged options */
1901 switchchar = arg[1];
1904 /* Make all -ex options synonymous with -oex arguments, since that
1905 is assumed by various callers. Also make -qR options synonymous with -R
1906 options, as that seems to be required as well. Allow for -qqR too, and
1907 the same for -S options. */
1909 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1910 Ustrncmp(arg+1, "qR", 2) == 0 ||
1911 Ustrncmp(arg+1, "qS", 2) == 0)
1913 switchchar = arg[2];
1916 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1918 switchchar = arg[3];
1920 f.queue_2stage = TRUE;
1923 /* Make -r synonymous with -f, since it is a documented alias */
1925 else if (arg[1] == 'r') switchchar = 'f';
1927 /* Make -ov synonymous with -v */
1929 else if (Ustrcmp(arg, "-ov") == 0)
1935 /* deal with --option_aliases */
1936 else if (switchchar == '-')
1938 if (Ustrcmp(argrest, "help") == 0)
1940 usage_wanted = TRUE;
1943 else if (Ustrcmp(argrest, "version") == 0)
1950 /* High-level switch on active initial letter */
1955 /* sendmail uses -Ac and -Am to control which .cf file is used;
1958 if (*argrest == '\0') { badarg = TRUE; break; }
1961 BOOL ignore = FALSE;
1966 if (*(argrest + 1) == '\0')
1970 if (!ignore) { badarg = TRUE; break; }
1974 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1975 so has no need of it. */
1978 if (*argrest == 0) i++; /* Skip over the type */
1983 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1985 /* -bd: Run in daemon mode, awaiting SMTP connections.
1986 -bdf: Ditto, but in the foreground.
1989 if (*argrest == 'd')
1991 f.daemon_listen = TRUE;
1992 if (*(++argrest) == 'f') f.background_daemon = FALSE;
1993 else if (*argrest != 0) { badarg = TRUE; break; }
1996 /* -be: Run in expansion test mode
1997 -bem: Ditto, but read a message from a file first
2000 else if (*argrest == 'e')
2002 expansion_test = checking = TRUE;
2003 if (argrest[1] == 'm')
2005 if (++i >= argc) { badarg = TRUE; break; }
2006 expansion_test_message = argv[i];
2009 if (argrest[1] != 0) { badarg = TRUE; break; }
2012 /* -bF: Run system filter test */
2014 else if (*argrest == 'F')
2016 filter_test |= checking = FTEST_SYSTEM;
2017 if (*(++argrest) != 0) { badarg = TRUE; break; }
2018 if (++i < argc) filter_test_sfile = argv[i]; else
2019 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2022 /* -bf: Run user filter test
2023 -bfd: Set domain for filter testing
2024 -bfl: Set local part for filter testing
2025 -bfp: Set prefix for filter testing
2026 -bfs: Set suffix for filter testing
2029 else if (*argrest == 'f')
2031 if (*(++argrest) == 0)
2033 filter_test |= checking = FTEST_USER;
2034 if (++i < argc) filter_test_ufile = argv[i]; else
2035 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2040 exim_fail("exim: string expected after %s\n", arg);
2041 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2042 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2043 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2044 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2045 else { badarg = TRUE; break; }
2049 /* -bh: Host checking - an IP address must follow. */
2051 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2053 if (++i >= argc) { badarg = TRUE; break; }
2054 sender_host_address = argv[i];
2055 host_checking = checking = f.log_testing_mode = TRUE;
2056 f.host_checking_callout = argrest[1] == 'c';
2057 message_logs = FALSE;
2060 /* -bi: This option is used by sendmail to initialize *the* alias file,
2061 though it has the -oA option to specify a different file. Exim has no
2062 concept of *the* alias file, but since Sun's YP make script calls
2063 sendmail this way, some support must be provided. */
2065 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2067 /* -bI: provide information, of the type to follow after a colon.
2068 This is an Exim flag. */
2070 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2072 uschar *p = &argrest[2];
2073 info_flag = CMDINFO_HELP;
2076 if (strcmpic(p, CUS"sieve") == 0)
2078 info_flag = CMDINFO_SIEVE;
2081 else if (strcmpic(p, CUS"dscp") == 0)
2083 info_flag = CMDINFO_DSCP;
2086 else if (strcmpic(p, CUS"help") == 0)
2093 /* -bm: Accept and deliver message - the default option. Reinstate
2094 receiving_message, which got turned off for all -b options. */
2096 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2098 /* -bmalware: test the filename given for malware */
2100 else if (Ustrcmp(argrest, "malware") == 0)
2102 if (++i >= argc) { badarg = TRUE; break; }
2104 malware_test_file = argv[i];
2107 /* -bnq: For locally originating messages, do not qualify unqualified
2108 addresses. In the envelope, this causes errors; in header lines they
2111 else if (Ustrcmp(argrest, "nq") == 0)
2113 f.allow_unqualified_sender = FALSE;
2114 f.allow_unqualified_recipient = FALSE;
2117 /* -bpxx: List the contents of the mail queue, in various forms. If
2118 the option is -bpc, just a queue count is needed. Otherwise, if the
2119 first letter after p is r, then order is random. */
2121 else if (*argrest == 'p')
2123 if (*(++argrest) == 'c')
2126 if (*(++argrest) != 0) badarg = TRUE;
2130 if (*argrest == 'r')
2132 list_queue_option = 8;
2135 else list_queue_option = 0;
2139 /* -bp: List the contents of the mail queue, top-level only */
2141 if (*argrest == 0) {}
2143 /* -bpu: List the contents of the mail queue, top-level undelivered */
2145 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2147 /* -bpa: List the contents of the mail queue, including all delivered */
2149 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2151 /* Unknown after -bp[r] */
2161 /* -bP: List the configuration variables given as the address list.
2162 Force -v, so configuration errors get displayed. */
2164 else if (Ustrcmp(argrest, "P") == 0)
2166 /* -bP config: we need to setup here, because later,
2167 * when list_options is checked, the config is read already */
2168 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2171 readconf_save_config(version_string);
2175 list_options = TRUE;
2176 debug_selector |= D_v;
2177 debug_file = stderr;
2181 /* -brt: Test retry configuration lookup */
2183 else if (Ustrcmp(argrest, "rt") == 0)
2186 test_retry_arg = i + 1;
2190 /* -brw: Test rewrite configuration */
2192 else if (Ustrcmp(argrest, "rw") == 0)
2195 test_rewrite_arg = i + 1;
2199 /* -bS: Read SMTP commands on standard input, but produce no replies -
2200 all errors are reported by sending messages. */
2202 else if (Ustrcmp(argrest, "S") == 0)
2203 smtp_input = smtp_batched_input = receiving_message = TRUE;
2205 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2206 on standard output. */
2208 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2210 /* -bt: address testing mode */
2212 else if (Ustrcmp(argrest, "t") == 0)
2213 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2215 /* -bv: verify addresses */
2217 else if (Ustrcmp(argrest, "v") == 0)
2218 verify_address_mode = checking = f.log_testing_mode = TRUE;
2220 /* -bvs: verify sender addresses */
2222 else if (Ustrcmp(argrest, "vs") == 0)
2224 verify_address_mode = checking = f.log_testing_mode = TRUE;
2225 verify_as_sender = TRUE;
2228 /* -bV: Print version string and support details */
2230 else if (Ustrcmp(argrest, "V") == 0)
2232 printf("Exim version %s #%s built %s\n", version_string,
2233 version_cnumber, version_date);
2234 printf("%s\n", CS version_copyright);
2235 version_printed = TRUE;
2236 show_whats_supported(stdout);
2237 f.log_testing_mode = TRUE;
2240 /* -bw: inetd wait mode, accept a listening socket as stdin */
2242 else if (*argrest == 'w')
2244 f.inetd_wait_mode = TRUE;
2245 f.background_daemon = FALSE;
2246 f.daemon_listen = TRUE;
2247 if (*(++argrest) != '\0')
2248 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2249 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2256 /* -C: change configuration file list; ignore if it isn't really
2257 a change! Enforce a prefix check if required. */
2262 if(++i < argc) argrest = argv[i]; else
2263 { badarg = TRUE; break; }
2265 if (Ustrcmp(config_main_filelist, argrest) != 0)
2267 #ifdef ALT_CONFIG_PREFIX
2269 int len = Ustrlen(ALT_CONFIG_PREFIX);
2270 const uschar *list = argrest;
2272 while((filename = string_nextinlist(&list, &sep, big_buffer,
2273 big_buffer_size)) != NULL)
2275 if ((Ustrlen(filename) < len ||
2276 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2277 Ustrstr(filename, "/../") != NULL) &&
2278 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2279 exim_fail("-C Permission denied\n");
2282 if (real_uid != root_uid)
2284 #ifdef TRUSTED_CONFIG_LIST
2286 if (real_uid != exim_uid
2287 #ifdef CONFIGURE_OWNER
2288 && real_uid != config_uid
2291 f.trusted_config = FALSE;
2294 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2297 struct stat statbuf;
2299 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2300 (statbuf.st_uid != root_uid /* owner not root */
2301 #ifdef CONFIGURE_OWNER
2302 && statbuf.st_uid != config_uid /* owner not the special one */
2305 (statbuf.st_gid != root_gid /* group not root */
2306 #ifdef CONFIGURE_GROUP
2307 && statbuf.st_gid != config_gid /* group not the special one */
2309 && (statbuf.st_mode & 020) != 0 /* group writeable */
2311 (statbuf.st_mode & 2) != 0) /* world writeable */
2313 f.trusted_config = FALSE;
2318 /* Well, the trust list at least is up to scratch... */
2319 void *reset_point = store_get(0);
2320 uschar *trusted_configs[32];
2324 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2326 uschar *start = big_buffer, *nl;
2327 while (*start && isspace(*start))
2331 nl = Ustrchr(start, '\n');
2334 trusted_configs[nr_configs++] = string_copy(start);
2335 if (nr_configs == 32)
2343 const uschar *list = argrest;
2345 while (f.trusted_config && (filename = string_nextinlist(&list,
2346 &sep, big_buffer, big_buffer_size)) != NULL)
2348 for (i=0; i < nr_configs; i++)
2350 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2353 if (i == nr_configs)
2355 f.trusted_config = FALSE;
2359 store_reset(reset_point);
2363 /* No valid prefixes found in trust_list file. */
2364 f.trusted_config = FALSE;
2370 /* Could not open trust_list file. */
2371 f.trusted_config = FALSE;
2375 /* Not root; don't trust config */
2376 f.trusted_config = FALSE;
2380 config_main_filelist = argrest;
2381 f.config_changed = TRUE;
2386 /* -D: set up a macro definition */
2389 #ifdef DISABLE_D_OPTION
2390 exim_fail("exim: -D is not available in this Exim binary\n");
2396 uschar *s = argrest;
2399 while (isspace(*s)) s++;
2401 if (*s < 'A' || *s > 'Z')
2402 exim_fail("exim: macro name set by -D must start with "
2403 "an upper case letter\n");
2405 while (isalnum(*s) || *s == '_')
2407 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2411 if (ptr == 0) { badarg = TRUE; break; }
2412 while (isspace(*s)) s++;
2415 if (*s++ != '=') { badarg = TRUE; break; }
2416 while (isspace(*s)) s++;
2419 for (m = macros_user; m; m = m->next)
2420 if (Ustrcmp(m->name, name) == 0)
2421 exim_fail("exim: duplicated -D in command line\n");
2423 m = macro_create(name, s, TRUE);
2425 if (clmacro_count >= MAX_CLMACROS)
2426 exim_fail("exim: too many -D options on command line\n");
2427 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2433 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2434 The latter is now a no-op, retained for compatibility only. If -dd is used,
2435 debugging subprocesses of the daemon is disabled. */
2438 if (Ustrcmp(argrest, "ropcr") == 0)
2440 /* drop_cr = TRUE; */
2443 /* Use an intermediate variable so that we don't set debugging while
2444 decoding the debugging bits. */
2448 unsigned int selector = D_default;
2451 if (*argrest == 'd')
2453 f.debug_daemon = TRUE;
2457 decode_bits(&selector, 1, debug_notall, argrest,
2458 debug_options, debug_options_count, US"debug", 0);
2459 debug_selector = selector;
2464 /* -E: This is a local error message. This option is not intended for
2465 external use at all, but is not restricted to trusted callers because it
2466 does no harm (just suppresses certain error messages) and if Exim is run
2467 not setuid root it won't always be trusted when it generates error
2468 messages using this option. If there is a message id following -E, point
2469 message_reference at it, for logging. */
2472 f.local_error_message = TRUE;
2473 if (mac_ismsgid(argrest)) message_reference = argrest;
2477 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2478 option, so it looks as if historically the -oex options are also callable
2479 without the leading -o. So we have to accept them. Before the switch,
2480 anything starting -oe has been converted to -e. Exim does not support all
2481 of the sendmail error options. */
2484 if (Ustrcmp(argrest, "e") == 0)
2486 arg_error_handling = ERRORS_SENDER;
2487 errors_sender_rc = EXIT_SUCCESS;
2489 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2490 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2491 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2492 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2497 /* -F: Set sender's full name, used instead of the gecos entry from
2498 the password file. Since users can usually alter their gecos entries,
2499 there's no security involved in using this instead. The data can follow
2500 the -F or be in the next argument. */
2505 if(++i < argc) argrest = argv[i]; else
2506 { badarg = TRUE; break; }
2508 originator_name = argrest;
2509 f.sender_name_forced = TRUE;
2513 /* -f: Set sender's address - this value is only actually used if Exim is
2514 run by a trusted user, or if untrusted_set_sender is set and matches the
2515 address, except that the null address can always be set by any user. The
2516 test for this happens later, when the value given here is ignored when not
2517 permitted. For an untrusted user, the actual sender is still put in Sender:
2518 if it doesn't match the From: header (unless no_local_from_check is set).
2519 The data can follow the -f or be in the next argument. The -r switch is an
2520 obsolete form of -f but since there appear to be programs out there that
2521 use anything that sendmail has ever supported, better accept it - the
2522 synonymizing is done before the switch above.
2524 At this stage, we must allow domain literal addresses, because we don't
2525 know what the setting of allow_domain_literals is yet. Ditto for trailing
2526 dots and strip_trailing_dot. */
2530 int dummy_start, dummy_end;
2534 if (i+1 < argc) argrest = argv[++i]; else
2535 { badarg = TRUE; break; }
2538 sender_address = string_sprintf(""); /* Ensure writeable memory */
2541 uschar *temp = argrest + Ustrlen(argrest) - 1;
2542 while (temp >= argrest && isspace(*temp)) temp--;
2543 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2544 allow_domain_literals = TRUE;
2545 strip_trailing_dot = TRUE;
2547 allow_utf8_domains = TRUE;
2549 sender_address = parse_extract_address(argrest, &errmess,
2550 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2552 message_smtputf8 = string_is_utf8(sender_address);
2553 allow_utf8_domains = FALSE;
2555 allow_domain_literals = FALSE;
2556 strip_trailing_dot = FALSE;
2557 if (!sender_address)
2558 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2560 f.sender_address_forced = TRUE;
2564 /* -G: sendmail invocation to specify that it's a gateway submission and
2565 sendmail may complain about problems instead of fixing them.
2566 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2567 not at this time complain about problems. */
2573 /* -h: Set the hop count for an incoming message. Exim does not currently
2574 support this; it always computes it by counting the Received: headers.
2575 To put it in will require a change to the spool header file format. */
2580 if(++i < argc) argrest = argv[i]; else
2581 { badarg = TRUE; break; }
2583 if (!isdigit(*argrest)) badarg = TRUE;
2587 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2588 not to be documented for sendmail but mailx (at least) uses it) */
2591 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2595 /* -L: set the identifier used for syslog; equivalent to setting
2596 syslog_processname in the config file, but needs to be an admin option. */
2599 if (*argrest == '\0')
2601 if(++i < argc) argrest = argv[i]; else
2602 { badarg = TRUE; break; }
2604 if ((sz = Ustrlen(argrest)) > 32)
2605 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2607 exim_fail("exim: the -L syslog name is too short\n");
2608 cmdline_syslog_name = argrest;
2612 receiving_message = FALSE;
2614 /* -MC: continue delivery of another message via an existing open
2615 file descriptor. This option is used for an internal call by the
2616 smtp transport when there is a pending message waiting to go to an
2617 address to which it has got a connection. Five subsequent arguments are
2618 required: transport name, host name, IP address, sequence number, and
2619 message_id. Transports may decline to create new processes if the sequence
2620 number gets too big. The channel is stdin. This (-MC) must be the last
2621 argument. There's a subsequent check that the real-uid is privileged.
2623 If we are running in the test harness. delay for a bit, to let the process
2624 that set this one up complete. This makes for repeatability of the logging,
2627 if (Ustrcmp(argrest, "C") == 0)
2629 union sockaddr_46 interface_sock;
2630 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2633 exim_fail("exim: too many or too few arguments after -MC\n");
2635 if (msg_action_arg >= 0)
2636 exim_fail("exim: incompatible arguments\n");
2638 continue_transport = argv[++i];
2639 continue_hostname = argv[++i];
2640 continue_host_address = argv[++i];
2641 continue_sequence = Uatoi(argv[++i]);
2642 msg_action = MSG_DELIVER;
2643 msg_action_arg = ++i;
2644 forced_delivery = TRUE;
2645 queue_run_pid = passed_qr_pid;
2646 queue_run_pipe = passed_qr_pipe;
2648 if (!mac_ismsgid(argv[i]))
2649 exim_fail("exim: malformed message id %s after -MC option\n",
2652 /* Set up $sending_ip_address and $sending_port, unless proxied */
2654 if (!continue_proxy_cipher)
2655 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2657 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2660 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2663 if (f.running_in_test_harness) millisleep(500);
2667 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2671 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2672 precedes -MC (see above). The flag indicates that the host to which
2673 Exim is connected has accepted an AUTH sequence. */
2675 case 'A': f.smtp_authenticated = TRUE; break;
2677 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2678 that exim is connected to supports the esmtp extension DSN */
2680 case 'D': smtp_peer_options |= OPTION_DSN; break;
2682 /* -MCG: set the queue name, to a non-default value */
2684 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2688 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2690 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2692 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2693 it preceded -MC (see above) */
2695 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2697 /* -MCQ: pass on the pid of the queue-running process that started
2698 this chain of deliveries and the fd of its synchronizing pipe; this
2699 is useful only when it precedes -MC (see above) */
2701 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2703 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2707 /* -MCS: set the smtp_use_size flag; this is useful only when it
2708 precedes -MC (see above) */
2710 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2713 /* -MCt: similar to -MCT below but the connection is still open
2714 via a proxy process which handles the TLS context and coding.
2715 Require three arguments for the proxied local address and port,
2716 and the TLS cipher. */
2718 case 't': if (++i < argc) sending_ip_address = argv[i];
2720 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2722 if (++i < argc) continue_proxy_cipher = argv[i];
2726 /* -MCT: set the tls_offered flag; this is useful only when it
2727 precedes -MC (see above). The flag indicates that the host to which
2728 Exim is connected has offered TLS support. */
2730 case 'T': smtp_peer_options |= OPTION_TLS; break;
2733 default: badarg = TRUE; break;
2738 /* -M[x]: various operations on the following list of message ids:
2739 -M deliver the messages, ignoring next retry times and thawing
2740 -Mc deliver the messages, checking next retry times, no thawing
2741 -Mf freeze the messages
2742 -Mg give up on the messages
2743 -Mt thaw the messages
2744 -Mrm remove the messages
2745 In the above cases, this must be the last option. There are also the
2746 following options which are followed by a single message id, and which
2747 act on that message. Some of them use the "recipient" addresses as well.
2748 -Mar add recipient(s)
2749 -Mmad mark all recipients delivered
2750 -Mmd mark recipients(s) delivered
2752 -Mset load a message for use with -be
2754 -Mvc show copy (of whole message, in RFC 2822 format)
2759 else if (*argrest == 0)
2761 msg_action = MSG_DELIVER;
2762 forced_delivery = f.deliver_force_thaw = TRUE;
2764 else if (Ustrcmp(argrest, "ar") == 0)
2766 msg_action = MSG_ADD_RECIPIENT;
2767 one_msg_action = TRUE;
2769 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2770 else if (Ustrcmp(argrest, "es") == 0)
2772 msg_action = MSG_EDIT_SENDER;
2773 one_msg_action = TRUE;
2775 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2776 else if (Ustrcmp(argrest, "g") == 0)
2778 msg_action = MSG_DELIVER;
2779 deliver_give_up = TRUE;
2781 else if (Ustrcmp(argrest, "mad") == 0)
2783 msg_action = MSG_MARK_ALL_DELIVERED;
2785 else if (Ustrcmp(argrest, "md") == 0)
2787 msg_action = MSG_MARK_DELIVERED;
2788 one_msg_action = TRUE;
2790 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2791 else if (Ustrcmp(argrest, "set") == 0)
2793 msg_action = MSG_LOAD;
2794 one_msg_action = TRUE;
2796 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2797 else if (Ustrcmp(argrest, "vb") == 0)
2799 msg_action = MSG_SHOW_BODY;
2800 one_msg_action = TRUE;
2802 else if (Ustrcmp(argrest, "vc") == 0)
2804 msg_action = MSG_SHOW_COPY;
2805 one_msg_action = TRUE;
2807 else if (Ustrcmp(argrest, "vh") == 0)
2809 msg_action = MSG_SHOW_HEADER;
2810 one_msg_action = TRUE;
2812 else if (Ustrcmp(argrest, "vl") == 0)
2814 msg_action = MSG_SHOW_LOG;
2815 one_msg_action = TRUE;
2817 else { badarg = TRUE; break; }
2819 /* All the -Mxx options require at least one message id. */
2821 msg_action_arg = i + 1;
2822 if (msg_action_arg >= argc)
2823 exim_fail("exim: no message ids given after %s option\n", arg);
2825 /* Some require only message ids to follow */
2827 if (!one_msg_action)
2829 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2830 exim_fail("exim: malformed message id %s after %s option\n",
2832 goto END_ARG; /* Remaining args are ids */
2835 /* Others require only one message id, possibly followed by addresses,
2836 which will be handled as normal arguments. */
2840 if (!mac_ismsgid(argv[msg_action_arg]))
2841 exim_fail("exim: malformed message id %s after %s option\n",
2842 argv[msg_action_arg], arg);
2848 /* Some programs seem to call the -om option without the leading o;
2849 for sendmail it askes for "me too". Exim always does this. */
2852 if (*argrest != 0) badarg = TRUE;
2856 /* -N: don't do delivery - a debugging option that stops transports doing
2857 their thing. It implies debugging at the D_v level. */
2862 f.dont_deliver = TRUE;
2863 debug_selector |= D_v;
2864 debug_file = stderr;
2870 /* -n: This means "don't alias" in sendmail, apparently.
2871 For normal invocations, it has no effect.
2872 It may affect some other options. */
2878 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2879 option to the specified value. This form uses long names. We need to handle
2880 -O option=value and -Ooption=value. */
2886 exim_fail("exim: string expected after -O\n");
2892 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2895 if (*argrest == 'A')
2897 alias_arg = argrest + 1;
2898 if (alias_arg[0] == 0)
2900 if (i+1 < argc) alias_arg = argv[++i]; else
2901 exim_fail("exim: string expected after -oA\n");
2905 /* -oB: Set a connection message max value for remote deliveries */
2907 else if (*argrest == 'B')
2909 uschar *p = argrest + 1;
2912 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2914 connection_max_messages = 1;
2922 exim_fail("exim: number expected after -oB\n");
2923 connection_max_messages = Uatoi(p);
2927 /* -odb: background delivery */
2929 else if (Ustrcmp(argrest, "db") == 0)
2931 f.synchronous_delivery = FALSE;
2932 arg_queue_only = FALSE;
2933 queue_only_set = TRUE;
2936 /* -odf: foreground delivery (smail-compatible option); same effect as
2937 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2940 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2942 f.synchronous_delivery = TRUE;
2943 arg_queue_only = FALSE;
2944 queue_only_set = TRUE;
2947 /* -odq: queue only */
2949 else if (Ustrcmp(argrest, "dq") == 0)
2951 f.synchronous_delivery = FALSE;
2952 arg_queue_only = TRUE;
2953 queue_only_set = TRUE;
2956 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2957 but no remote delivery */
2959 else if (Ustrcmp(argrest, "dqs") == 0)
2961 f.queue_smtp = TRUE;
2962 arg_queue_only = FALSE;
2963 queue_only_set = TRUE;
2966 /* -oex: Sendmail error flags. As these are also accepted without the
2967 leading -o prefix, for compatibility with vacation and other callers,
2968 they are handled with -e above. */
2970 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2971 -oitrue: Another sendmail syntax for the same */
2973 else if (Ustrcmp(argrest, "i") == 0 ||
2974 Ustrcmp(argrest, "itrue") == 0)
2977 /* -oM*: Set various characteristics for an incoming message; actually
2978 acted on for trusted callers only. */
2980 else if (*argrest == 'M')
2983 exim_fail("exim: data expected after -o%s\n", argrest);
2985 /* -oMa: Set sender host address */
2987 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2989 /* -oMaa: Set authenticator name */
2991 else if (Ustrcmp(argrest, "Maa") == 0)
2992 sender_host_authenticated = argv[++i];
2994 /* -oMas: setting authenticated sender */
2996 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2998 /* -oMai: setting authenticated id */
3000 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3002 /* -oMi: Set incoming interface address */
3004 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3006 /* -oMm: Message reference */
3008 else if (Ustrcmp(argrest, "Mm") == 0)
3010 if (!mac_ismsgid(argv[i+1]))
3011 exim_fail("-oMm must be a valid message ID\n");
3012 if (!f.trusted_config)
3013 exim_fail("-oMm must be called by a trusted user/config\n");
3014 message_reference = argv[++i];
3017 /* -oMr: Received protocol */
3019 else if (Ustrcmp(argrest, "Mr") == 0)
3021 if (received_protocol)
3022 exim_fail("received_protocol is set already\n");
3024 received_protocol = argv[++i];
3026 /* -oMs: Set sender host name */
3028 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3030 /* -oMt: Set sender ident */
3032 else if (Ustrcmp(argrest, "Mt") == 0)
3034 sender_ident_set = TRUE;
3035 sender_ident = argv[++i];
3038 /* Else a bad argument */
3047 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3048 seem to call this as -m (undocumented), so that is also accepted (see
3051 else if (Ustrcmp(argrest, "m") == 0) {}
3053 /* -oo: An ancient flag for old-style addresses which still seems to
3054 crop up in some calls (see in SCO). */
3056 else if (Ustrcmp(argrest, "o") == 0) {}
3058 /* -oP <name>: set pid file path for daemon */
3060 else if (Ustrcmp(argrest, "P") == 0)
3061 override_pid_file_path = argv[++i];
3063 /* -or <n>: set timeout for non-SMTP acceptance
3064 -os <n>: set timeout for SMTP acceptance */
3066 else if (*argrest == 'r' || *argrest == 's')
3068 int *tp = (*argrest == 'r')?
3069 &arg_receive_timeout : &arg_smtp_receive_timeout;
3070 if (argrest[1] == 0)
3072 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3074 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3076 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3079 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3081 else if (Ustrcmp(argrest, "X") == 0)
3082 override_local_interfaces = argv[++i];
3084 /* Unknown -o argument */
3090 /* -ps: force Perl startup; -pd force delayed Perl startup */
3094 if (*argrest == 's' && argrest[1] == 0)
3096 perl_start_option = 1;
3099 if (*argrest == 'd' && argrest[1] == 0)
3101 perl_start_option = -1;
3106 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3107 which sets the host protocol and host name */
3111 argrest = argv[++i];
3113 { badarg = TRUE; break; }
3119 if (received_protocol)
3120 exim_fail("received_protocol is set already\n");
3122 hn = Ustrchr(argrest, ':');
3124 received_protocol = argrest;
3127 int old_pool = store_pool;
3128 store_pool = POOL_PERM;
3129 received_protocol = string_copyn(argrest, hn - argrest);
3130 store_pool = old_pool;
3131 sender_host_name = hn + 1;
3138 receiving_message = FALSE;
3139 if (queue_interval >= 0)
3140 exim_fail("exim: -q specified more than once\n");
3142 /* -qq...: Do queue runs in a 2-stage manner */
3144 if (*argrest == 'q')
3146 f.queue_2stage = TRUE;
3150 /* -qi...: Do only first (initial) deliveries */
3152 if (*argrest == 'i')
3154 f.queue_run_first_delivery = TRUE;
3158 /* -qf...: Run the queue, forcing deliveries
3159 -qff..: Ditto, forcing thawing as well */
3161 if (*argrest == 'f')
3163 f.queue_run_force = TRUE;
3164 if (*++argrest == 'f')
3166 f.deliver_force_thaw = TRUE;
3171 /* -q[f][f]l...: Run the queue only on local deliveries */
3173 if (*argrest == 'l')
3175 f.queue_run_local = TRUE;
3179 /* -q[f][f][l][G<name>]... Work on the named queue */
3181 if (*argrest == 'G')
3184 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3185 queue_name = string_copyn(argrest, i);
3187 if (*argrest == '/') argrest++;
3190 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3191 only, optionally named, optionally starting from a given message id. */
3193 if (*argrest == 0 &&
3194 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3197 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3198 start_queue_run_id = argv[++i];
3199 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3200 stop_queue_run_id = argv[++i];
3203 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3204 forced, optionally local only, optionally named. */
3206 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3208 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3212 case 'R': /* Synonymous with -qR... */
3213 receiving_message = FALSE;
3215 /* -Rf: As -R (below) but force all deliveries,
3216 -Rff: Ditto, but also thaw all frozen messages,
3217 -Rr: String is regex
3218 -Rrf: Regex and force
3219 -Rrff: Regex and force and thaw
3221 in all cases provided there are no further characters in this
3225 for (int i = 0; i < nelem(rsopts); i++)
3226 if (Ustrcmp(argrest, rsopts[i]) == 0)
3228 if (i != 2) f.queue_run_force = TRUE;
3229 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3230 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3231 argrest += Ustrlen(rsopts[i]);
3234 /* -R: Set string to match in addresses for forced queue run to
3235 pick out particular messages. */
3238 deliver_selectstring = argrest;
3239 else if (i+1 < argc)
3240 deliver_selectstring = argv[++i];
3242 exim_fail("exim: string expected after -R\n");
3246 /* -r: an obsolete synonym for -f (see above) */
3249 /* -S: Like -R but works on sender. */
3251 case 'S': /* Synonymous with -qS... */
3252 receiving_message = FALSE;
3254 /* -Sf: As -S (below) but force all deliveries,
3255 -Sff: Ditto, but also thaw all frozen messages,
3256 -Sr: String is regex
3257 -Srf: Regex and force
3258 -Srff: Regex and force and thaw
3260 in all cases provided there are no further characters in this
3264 for (int i = 0; i < nelem(rsopts); i++)
3265 if (Ustrcmp(argrest, rsopts[i]) == 0)
3267 if (i != 2) f.queue_run_force = TRUE;
3268 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3269 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3270 argrest += Ustrlen(rsopts[i]);
3273 /* -S: Set string to match in addresses for forced queue run to
3274 pick out particular messages. */
3277 deliver_selectstring_sender = argrest;
3278 else if (i+1 < argc)
3279 deliver_selectstring_sender = argv[++i];
3281 exim_fail("exim: string expected after -S\n");
3284 /* -Tqt is an option that is exclusively for use by the testing suite.
3285 It is not recognized in other circumstances. It allows for the setting up
3286 of explicit "queue times" so that various warning/retry things can be
3287 tested. Otherwise variability of clock ticks etc. cause problems. */
3290 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3291 fudged_queue_times = argv[++i];
3296 /* -t: Set flag to extract recipients from body of message. */
3299 if (*argrest == 0) extract_recipients = TRUE;
3301 /* -ti: Set flag to extract recipients from body of message, and also
3302 specify that dot does not end the message. */
3304 else if (Ustrcmp(argrest, "i") == 0)
3306 extract_recipients = TRUE;
3310 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3313 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3320 /* -U: This means "initial user submission" in sendmail, apparently. The
3321 doc claims that in future sendmail may refuse syntactically invalid
3322 messages instead of fixing them. For the moment, we just ignore it. */
3328 /* -v: verify things - this is a very low-level debugging */
3333 debug_selector |= D_v;
3334 debug_file = stderr;
3340 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3342 The -x flag tells the sendmail command that mail from a local
3343 mail program has National Language Support (NLS) extended characters
3344 in the body of the mail item. The sendmail command can send mail with
3345 extended NLS characters across networks that normally corrupts these
3348 As Exim is 8-bit clean, it just ignores this flag. */
3351 if (*argrest != 0) badarg = TRUE;
3354 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3355 logs to that file. We swallow the parameter and otherwise ignore it. */
3358 if (*argrest == '\0')
3360 exim_fail("exim: string expected after -X\n");
3364 if (*argrest == '\0')
3366 log_oneline = argv[i];
3368 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3371 /* All other initial characters are errors */
3376 } /* End of high-level switch statement */
3378 /* Failed to recognize the option, or syntax error */
3381 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3382 "option %s\n", arg);
3386 /* If -R or -S have been specified without -q, assume a single queue run. */
3388 if ( (deliver_selectstring || deliver_selectstring_sender)
3389 && queue_interval < 0)
3394 /* If usage_wanted is set we call the usage function - which never returns */
3395 if (usage_wanted) exim_usage(called_as);
3397 /* Arguments have been processed. Check for incompatibilities. */
3399 (smtp_input || extract_recipients || recipients_arg < argc) &&
3400 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3401 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3402 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3405 msg_action_arg > 0 &&
3406 (f.daemon_listen || queue_interval > 0 || list_options ||
3407 (checking && msg_action != MSG_LOAD) ||
3408 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3411 (f.daemon_listen || queue_interval > 0) &&
3412 (sender_address != NULL || list_options || list_queue || checking ||
3416 f.daemon_listen && queue_interval == 0
3419 f.inetd_wait_mode && queue_interval >= 0
3423 (checking || smtp_input || extract_recipients ||
3424 filter_test != FTEST_NONE || bi_option)
3427 verify_address_mode &&
3428 (f.address_test_mode || smtp_input || extract_recipients ||
3429 filter_test != FTEST_NONE || bi_option)
3432 f.address_test_mode && (smtp_input || extract_recipients ||
3433 filter_test != FTEST_NONE || bi_option)
3436 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3440 deliver_selectstring != NULL && queue_interval < 0
3443 msg_action == MSG_LOAD &&
3444 (!expansion_test || expansion_test_message != NULL)
3447 exim_fail("exim: incompatible command-line options or arguments\n");
3449 /* If debugging is set up, set the file and the file descriptor to pass on to
3450 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3451 to run in the foreground. */
3453 if (debug_selector != 0)
3455 debug_file = stderr;
3456 debug_fd = fileno(debug_file);
3457 f.background_daemon = FALSE;
3458 if (f.running_in_test_harness) millisleep(100); /* lets caller finish */
3459 if (debug_selector != D_v) /* -v only doesn't show this */
3461 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3462 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3464 if (!version_printed)
3465 show_whats_supported(stderr);
3469 /* When started with root privilege, ensure that the limits on the number of
3470 open files and the number of processes (where that is accessible) are
3471 sufficiently large, or are unset, in case Exim has been called from an
3472 environment where the limits are screwed down. Not all OS have the ability to
3473 change some of these limits. */
3477 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3483 #ifdef RLIMIT_NOFILE
3484 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3486 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3488 rlp.rlim_cur = rlp.rlim_max = 0;
3491 /* I originally chose 1000 as a nice big number that was unlikely to
3492 be exceeded. It turns out that some older OS have a fixed upper limit of
3495 if (rlp.rlim_cur < 1000)
3497 rlp.rlim_cur = rlp.rlim_max = 1000;
3498 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3500 rlp.rlim_cur = rlp.rlim_max = 256;
3501 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3502 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3509 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3511 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3513 rlp.rlim_cur = rlp.rlim_max = 0;
3516 #ifdef RLIM_INFINITY
3517 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3519 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3521 if (rlp.rlim_cur < 1000)
3523 rlp.rlim_cur = rlp.rlim_max = 1000;
3525 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3526 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3532 /* Exim is normally entered as root (but some special configurations are
3533 possible that don't do this). However, it always spins off sub-processes that
3534 set their uid and gid as required for local delivery. We don't want to pass on
3535 any extra groups that root may belong to, so we want to get rid of them all at
3538 We need to obey setgroups() at this stage, before possibly giving up root
3539 privilege for a changed configuration file, but later on we might need to
3540 check on the additional groups for the admin user privilege - can't do that
3541 till after reading the config, which might specify the exim gid. Therefore,
3542 save the group list here first. */
3544 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3545 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3547 /* There is a fundamental difference in some BSD systems in the matter of
3548 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3549 known not to be different. On the "different" systems there is a single group
3550 list, and the first entry in it is the current group. On all other versions of
3551 Unix there is a supplementary group list, which is in *addition* to the current
3552 group. Consequently, to get rid of all extraneous groups on a "standard" system
3553 you pass over 0 groups to setgroups(), while on a "different" system you pass
3554 over a single group - the current group, which is always the first group in the
3555 list. Calling setgroups() with zero groups on a "different" system results in
3556 an error return. The following code should cope with both types of system.
3558 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3559 the "setgroups() with zero groups" - and changes the egid.
3560 Thanks to that we had to stash the original_egid above, for use below
3561 in the call to exim_setugid().
3563 However, if this process isn't running as root, setgroups() can't be used
3564 since you have to be root to run it, even if throwing away groups. Not being
3565 root here happens only in some unusual configurations. We just ignore the
3568 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0 && !unprivileged)
3569 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3571 /* If the configuration file name has been altered by an argument on the
3572 command line (either a new file name or a macro definition) and the caller is
3573 not root, or if this is a filter testing run, remove any setuid privilege the
3574 program has and run as the underlying user.
3576 The exim user is locked out of this, which severely restricts the use of -C
3579 Otherwise, set the real ids to the effective values (should be root unless run
3580 from inetd, which it can either be root or the exim uid, if one is configured).
3582 There is a private mechanism for bypassing some of this, in order to make it
3583 possible to test lots of configurations automatically, without having either to
3584 recompile each time, or to patch in an actual configuration file name and other
3585 values (such as the path name). If running in the test harness, pretend that
3586 configuration file changes and macro definitions haven't happened. */
3589 (!f.trusted_config || /* Config changed, or */
3590 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3591 real_uid != root_uid && /* Not root, and */
3592 !f.running_in_test_harness /* Not fudged */
3594 expansion_test /* expansion testing */
3596 filter_test != FTEST_NONE) /* Filter testing */
3598 setgroups(group_count, group_list);
3599 exim_setugid(real_uid, real_gid, FALSE,
3600 US"-C, -D, -be or -bf forces real uid");
3601 removed_privilege = TRUE;
3603 /* In the normal case when Exim is called like this, stderr is available
3604 and should be used for any logging information because attempts to write
3605 to the log will usually fail. To arrange this, we unset really_exim. However,
3606 if no stderr is available there is no point - we might as well have a go
3607 at the log (if it fails, syslog will be written).
3609 Note that if the invoker is Exim, the logs remain available. Messing with
3610 this causes unlogged successful deliveries. */
3612 if (log_stderr && real_uid != exim_uid)
3613 f.really_exim = FALSE;
3616 /* Privilege is to be retained for the moment. It may be dropped later,
3617 depending on the job that this Exim process has been asked to do. For now, set
3618 the real uid to the effective so that subsequent re-execs of Exim are done by a
3622 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3624 /* If testing a filter, open the file(s) now, before wasting time doing other
3625 setups and reading the message. */
3627 if (filter_test & FTEST_SYSTEM)
3628 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3629 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3632 if (filter_test & FTEST_USER)
3633 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3634 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3637 /* Initialise lookup_list
3638 If debugging, already called above via version reporting.
3639 In either case, we initialise the list of available lookups while running
3640 as root. All dynamically modules are loaded from a directory which is
3641 hard-coded into the binary and is code which, if not a module, would be
3642 part of Exim already. Ability to modify the content of the directory
3643 is equivalent to the ability to modify a setuid binary!
3645 This needs to happen before we read the main configuration. */
3649 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3652 /* Read the main runtime configuration data; this gives up if there
3653 is a failure. It leaves the configuration file open so that the subsequent
3654 configuration data for delivery can be read if needed.
3656 NOTE: immediately after opening the configuration file we change the working
3657 directory to "/"! Later we change to $spool_directory. We do it there, because
3658 during readconf_main() some expansion takes place already. */
3660 /* Store the initial cwd before we change directories. Can be NULL if the
3661 dir has already been unlinked. */
3662 initial_cwd = os_getcwd(NULL, 0);
3665 -be[m] expansion test -
3666 -b[fF] filter test new
3668 -bmalware malware_test_file new
3670 -brw rewrite test new
3672 -bv[s] address verify -
3674 -bP <option> (except -bP config, which sets list_config)
3676 If any of these options is set, we suppress warnings about configuration
3677 issues (currently about tls_advertise_hosts and keep_environment not being
3680 readconf_main(checking || list_options);
3683 /* Now in directory "/" */
3685 if (cleanup_environment() == FALSE)
3686 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3689 /* If an action on specific messages is requested, or if a daemon or queue
3690 runner is being started, we need to know if Exim was called by an admin user.
3691 This is the case if the real user is root or exim, or if the real group is
3692 exim, or if one of the supplementary groups is exim or a group listed in
3693 admin_groups. We don't fail all message actions immediately if not admin_user,
3694 since some actions can be performed by non-admin users. Instead, set admin_user
3695 for later interrogation. */
3697 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3698 f.admin_user = TRUE;
3700 for (int i = 0; i < group_count && !f.admin_user; i++)
3701 if (group_list[i] == exim_gid)
3702 f.admin_user = TRUE;
3703 else if (admin_groups)
3704 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3705 if (admin_groups[j] == group_list[i])
3706 f.admin_user = TRUE;
3708 /* Another group of privileged users are the trusted users. These are root,
3709 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3710 are permitted to specify sender_addresses with -f on the command line, and
3711 other message parameters as well. */
3713 if (real_uid == root_uid || real_uid == exim_uid)
3714 f.trusted_caller = TRUE;
3718 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3719 if (trusted_users[i] == real_uid)
3720 f.trusted_caller = TRUE;
3723 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3724 if (trusted_groups[i] == real_gid)
3725 f.trusted_caller = TRUE;
3726 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3727 if (trusted_groups[i] == group_list[j])
3728 f.trusted_caller = TRUE;
3731 /* At this point, we know if the user is privileged and some command-line
3732 options become possibly impermissible, depending upon the configuration file. */
3734 if (checking && commandline_checks_require_admin && !f.admin_user)
3735 exim_fail("exim: those command-line flags are set to require admin\n");
3737 /* Handle the decoding of logging options. */
3739 decode_bits(log_selector, log_selector_size, log_notall,
3740 log_selector_string, log_options, log_options_count, US"log", 0);
3744 debug_printf("configuration file is %s\n", config_main_filename);
3745 debug_printf("log selectors =");
3746 for (int i = 0; i < log_selector_size; i++)
3747 debug_printf(" %08x", log_selector[i]);
3751 /* If domain literals are not allowed, check the sender address that was
3752 supplied with -f. Ditto for a stripped trailing dot. */
3756 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3757 exim_fail("exim: bad -f address \"%s\": domain literals not "
3758 "allowed\n", sender_address);
3759 if (f_end_dot && !strip_trailing_dot)
3760 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3761 "(trailing dot not allowed)\n", sender_address);
3764 /* See if an admin user overrode our logging. */
3766 if (cmdline_syslog_name)
3769 syslog_processname = cmdline_syslog_name;
3770 log_file_path = string_copy(CUS"syslog");
3773 /* not a panic, non-privileged users should not be able to spam paniclog */
3775 "exim: you lack sufficient privilege to specify syslog process name\n");
3777 /* Paranoia check of maximum lengths of certain strings. There is a check
3778 on the length of the log file path in log.c, which will come into effect
3779 if there are any calls to write the log earlier than this. However, if we
3780 get this far but the string is very long, it is better to stop now than to
3781 carry on and (e.g.) receive a message and then have to collapse. The call to
3782 log_write() from here will cause the ultimate panic collapse if the complete
3783 file name exceeds the buffer length. */
3785 if (Ustrlen(log_file_path) > 200)
3786 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3787 "log_file_path is longer than 200 chars: aborting");
3789 if (Ustrlen(pid_file_path) > 200)
3790 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3791 "pid_file_path is longer than 200 chars: aborting");
3793 if (Ustrlen(spool_directory) > 200)
3794 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3795 "spool_directory is longer than 200 chars: aborting");
3797 /* Length check on the process name given to syslog for its TAG field,
3798 which is only permitted to be 32 characters or less. See RFC 3164. */
3800 if (Ustrlen(syslog_processname) > 32)
3801 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3802 "syslog_processname is longer than 32 chars: aborting");
3807 log_write(0, LOG_MAIN, "%s", log_oneline);
3808 return EXIT_SUCCESS;
3811 return EXIT_FAILURE;
3813 /* In some operating systems, the environment variable TMPDIR controls where
3814 temporary files are created; Exim doesn't use these (apart from when delivering
3815 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3816 If TMPDIR is found in the environment, reset it to the value defined in the
3817 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3818 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3819 EXIM_TMPDIR by the build scripts.
3823 if (environ) for (uschar ** p = USS environ; *p; p++)
3824 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3826 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3827 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3829 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3833 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3834 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3835 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3836 called by a user who has set the TZ variable. This then affects the timestamps
3837 in log files and in Received: headers, and any created Date: header lines. The
3838 required timezone is settable in the configuration file, so nothing can be done
3839 about this earlier - but hopefully nothing will normally be logged earlier than
3840 this. We have to make a new environment if TZ is wrong, but don't bother if
3841 timestamps_utc is set, because then all times are in UTC anyway. */
3843 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3844 f.timestamps_utc = TRUE;
3847 uschar *envtz = US getenv("TZ");
3849 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3850 : timezone_string != NULL
3853 uschar **p = USS environ;
3857 if (environ) while (*p++) count++;
3858 if (!envtz) count++;
3859 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3860 if (environ) for (p = USS environ; *p; p++)
3861 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3862 if (timezone_string)
3864 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3865 sprintf(CS *newp++, "TZ=%s", timezone_string);
3870 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3871 tod_stamp(tod_log));
3875 /* Handle the case when we have removed the setuid privilege because of -C or
3876 -D. This means that the caller of Exim was not root.
3878 There is a problem if we were running as the Exim user. The sysadmin may
3879 expect this case to retain privilege because "the binary was called by the
3880 Exim user", but it hasn't, because either the -D option set macros, or the
3881 -C option set a non-trusted configuration file. There are two possibilities:
3883 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3884 to do message deliveries. Thus, the fact that it is running as a
3885 non-privileged user is plausible, and might be wanted in some special
3886 configurations. However, really_exim will have been set false when
3887 privilege was dropped, to stop Exim trying to write to its normal log
3888 files. Therefore, re-enable normal log processing, assuming the sysadmin
3889 has set up the log directory correctly.
3891 (2) If deliver_drop_privilege is not set, the configuration won't work as
3892 apparently intended, and so we log a panic message. In order to retain
3893 root for -C or -D, the caller must either be root or be invoking a
3894 trusted configuration file (when deliver_drop_privilege is false). */
3896 if ( removed_privilege
3897 && (!f.trusted_config || opt_D_used)
3898 && real_uid == exim_uid)
3899 if (deliver_drop_privilege)
3900 f.really_exim = TRUE; /* let logging work normally */
3902 log_write(0, LOG_MAIN|LOG_PANIC,
3903 "exim user lost privilege for using %s option",
3904 f.trusted_config? "-D" : "-C");
3906 /* Start up Perl interpreter if Perl support is configured and there is a
3907 perl_startup option, and the configuration or the command line specifies
3908 initializing starting. Note that the global variables are actually called
3909 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3912 if (perl_start_option != 0)
3913 opt_perl_at_start = (perl_start_option > 0);
3914 if (opt_perl_at_start && opt_perl_startup != NULL)
3917 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3918 if ((errstr = init_perl(opt_perl_startup)))
3919 exim_fail("exim: error in perl_startup code: %s\n", errstr);
3920 opt_perl_started = TRUE;
3922 #endif /* EXIM_PERL */
3924 /* Log the arguments of the call if the configuration file said so. This is
3925 a debugging feature for finding out what arguments certain MUAs actually use.
3926 Don't attempt it if logging is disabled, or if listing variables or if
3927 verifying/testing addresses or expansions. */
3929 if ( (debug_selector & D_any || LOGGING(arguments))
3930 && f.really_exim && !list_options && !checking)
3932 uschar *p = big_buffer;
3933 Ustrcpy(p, "cwd= (failed)");
3939 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3940 p += 4 + Ustrlen(initial_cwd);
3941 /* in case p is near the end and we don't provide enough space for
3942 * string_format to be willing to write. */
3946 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3948 for (int i = 0; i < argc; i++)
3950 int len = Ustrlen(argv[i]);
3951 const uschar *printing;
3953 if (p + len + 8 >= big_buffer + big_buffer_size)
3956 log_write(0, LOG_MAIN, "%s", big_buffer);
3957 Ustrcpy(big_buffer, "...");
3960 printing = string_printing(argv[i]);
3961 if (printing[0] == 0) quote = US"\""; else
3963 const uschar *pp = printing;
3965 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3967 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3968 (p - big_buffer) - 4), printing, quote);
3971 if (LOGGING(arguments))
3972 log_write(0, LOG_MAIN, "%s", big_buffer);
3974 debug_printf("%s\n", big_buffer);
3977 /* Set the working directory to be the top-level spool directory. We don't rely
3978 on this in the code, which always uses fully qualified names, but it's useful
3979 for core dumps etc. Don't complain if it fails - the spool directory might not
3980 be generally accessible and calls with the -C option (and others) have lost
3981 privilege by now. Before the chdir, we try to ensure that the directory exists.
3984 if (Uchdir(spool_directory) != 0)
3987 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3988 dummy = /* quieten compiler */ Uchdir(spool_directory);
3989 dummy = dummy; /* yet more compiler quietening, sigh */
3992 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3993 alias file. Exim doesn't have such a concept, but this call is screwed into
3994 Sun's YP makefiles. Handle this by calling a configured script, as the real
3995 user who called Exim. The -oA option can be used to pass an argument to the
4000 (void)fclose(config_file);
4001 if (bi_command != NULL)
4005 argv[i++] = bi_command;
4006 if (alias_arg != NULL) argv[i++] = alias_arg;
4009 setgroups(group_count, group_list);
4010 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4012 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4013 (argv[1] == NULL)? US"" : argv[1]);
4015 execv(CS argv[0], (char *const *)argv);
4016 exim_fail("exim: exec failed: %s\n", strerror(errno));
4020 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4025 /* We moved the admin/trusted check to be immediately after reading the
4026 configuration file. We leave these prints here to ensure that syslog setup,
4027 logfile setup, and so on has already happened. */
4029 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4030 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4032 /* Only an admin user may start the daemon or force a queue run in the default
4033 configuration, but the queue run restriction can be relaxed. Only an admin
4034 user may request that a message be returned to its sender forthwith. Only an
4035 admin user may specify a debug level greater than D_v (because it might show
4036 passwords, etc. in lookup queries). Only an admin user may request a queue
4037 count. Only an admin user can use the test interface to scan for email
4038 (because Exim will be in the spool dir and able to look at mails). */
4042 BOOL debugset = (debug_selector & ~D_v) != 0;
4043 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4044 (count_queue && queue_list_requires_admin) ||
4045 (list_queue && queue_list_requires_admin) ||
4046 (queue_interval >= 0 && prod_requires_admin) ||
4047 (debugset && !f.running_in_test_harness))
4048 exim_fail("exim:%s permission denied\n", debugset? " debugging" : "");
4051 /* If the real user is not root or the exim uid, the argument for passing
4052 in an open TCP/IP connection for another message is not permitted, nor is
4053 running with the -N option for any delivery action, unless this call to exim is
4054 one that supplied an input message, or we are using a patched exim for
4055 regression testing. */
4057 if (real_uid != root_uid && real_uid != exim_uid &&
4058 (continue_hostname != NULL ||
4060 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4061 )) && !f.running_in_test_harness)
4062 exim_fail("exim: Permission denied\n");
4064 /* If the caller is not trusted, certain arguments are ignored when running for
4065 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4066 Note that authority for performing certain actions on messages is tested in the
4067 queue_action() function. */
4069 if (!f.trusted_caller && !checking)
4071 sender_host_name = sender_host_address = interface_address =
4072 sender_ident = received_protocol = NULL;
4073 sender_host_port = interface_port = 0;
4074 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4077 /* If a sender host address is set, extract the optional port number off the
4078 end of it and check its syntax. Do the same thing for the interface address.
4079 Exim exits if the syntax is bad. */
4083 if (sender_host_address != NULL)
4084 sender_host_port = check_port(sender_host_address);
4085 if (interface_address != NULL)
4086 interface_port = check_port(interface_address);
4089 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4092 if (f.trusted_caller)
4094 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4095 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4098 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4101 /* If an SMTP message is being received check to see if the standard input is a
4102 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4103 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4108 union sockaddr_46 inetd_sock;
4109 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4110 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4112 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4113 if (family == AF_INET || family == AF_INET6)
4115 union sockaddr_46 interface_sock;
4116 size = sizeof(interface_sock);
4118 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4119 interface_address = host_ntoa(-1, &interface_sock, NULL,
4122 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4124 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4127 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4128 NULL, &sender_host_port);
4129 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4130 "inetd is not supported when mua_wrapper is set");
4134 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4139 /* If the load average is going to be needed while receiving a message, get it
4140 now for those OS that require the first call to os_getloadavg() to be done as
4141 root. There will be further calls later for each message received. */
4143 #ifdef LOAD_AVG_NEEDS_ROOT
4144 if (receiving_message &&
4145 (queue_only_load >= 0 ||
4146 (f.is_inetd && smtp_load_reserve >= 0)
4149 load_average = OS_GETLOADAVG();
4153 /* The queue_only configuration option can be overridden by -odx on the command
4154 line, except that if queue_only_override is false, queue_only cannot be unset
4155 from the command line. */
4157 if (queue_only_set && (queue_only_override || arg_queue_only))
4158 queue_only = arg_queue_only;
4160 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4163 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4164 if (arg_smtp_receive_timeout >= 0)
4165 smtp_receive_timeout = arg_smtp_receive_timeout;
4167 /* If Exim was started with root privilege, unless we have already removed the
4168 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4169 except when starting the daemon or doing some kind of delivery or address
4170 testing (-bt). These are the only cases when root need to be retained. We run
4171 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4172 retained only for starting the daemon. We always do the initgroups() in this
4173 situation (controlled by the TRUE below), in order to be as close as possible
4174 to the state Exim usually runs in. */
4176 if (!unprivileged && /* originally had root AND */
4177 !removed_privilege && /* still got root AND */
4178 !f.daemon_listen && /* not starting the daemon */
4179 queue_interval <= 0 && /* (either kind of daemon) */
4181 deliver_drop_privilege || /* requested unprivileged */
4183 queue_interval < 0 && /* not running the queue */
4184 (msg_action_arg < 0 || /* and */
4185 msg_action != MSG_DELIVER) && /* not delivering and */
4186 (!checking || !f.address_test_mode) /* not address checking */
4188 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4190 /* When we are retaining a privileged uid, we still change to the exim gid. */
4195 rv = setgid(exim_gid);
4196 /* Impact of failure is that some stuff might end up with an incorrect group.
4197 We track this for failures from root, since any attempt to change privilege
4198 by root should succeed and failures should be examined. For non-root,
4199 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4200 no need to complain then. */
4202 if (!(unprivileged || removed_privilege))
4203 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4205 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4206 (long int)exim_gid, strerror(errno));
4209 /* Handle a request to scan a file for malware */
4210 if (malware_test_file)
4212 #ifdef WITH_CONTENT_SCAN
4214 set_process_info("scanning file for malware");
4215 result = malware_in_file(malware_test_file);
4218 printf("No malware found.\n");
4223 printf("Malware lookup returned non-okay/fail: %d\n", result);
4227 printf("Malware found: %s\n", malware_name);
4229 printf("Malware scan detected malware of unknown name.\n");
4231 printf("Malware scanning not enabled at compile time.\n");
4236 /* Handle a request to list the delivery queue */
4240 set_process_info("listing the queue");
4241 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4245 /* Handle a request to count the delivery queue */
4249 set_process_info("counting the queue");
4254 /* Handle actions on specific messages, except for the force delivery and
4255 message load actions, which are done below. Some actions take a whole list of
4256 message ids, which are known to continue up to the end of the arguments. Others
4257 take a single message id and then operate on the recipients list. */
4259 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4261 int yield = EXIT_SUCCESS;
4262 set_process_info("acting on specified messages");
4264 /* ACL definitions may be needed when removing a message (-Mrm) because
4265 event_action gets expanded */
4267 if (msg_action == MSG_REMOVE)
4270 if (!one_msg_action)
4272 for (i = msg_action_arg; i < argc; i++)
4273 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4274 yield = EXIT_FAILURE;
4277 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4278 recipients_arg)) yield = EXIT_FAILURE;
4282 /* We used to set up here to skip reading the ACL section, on
4283 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4284 Now, since the intro of the ${acl } expansion, ACL definitions may be
4285 needed in transports so we lost the optimisation. */
4289 /* The configuration data will have been read into POOL_PERM because we won't
4290 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4291 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4292 configuration were read into POOL_MAIN, because we don't do any resets till
4293 later on. However, it seems right, and it does ensure that both pools get used.
4296 store_pool = POOL_MAIN;
4298 /* Handle the -brt option. This is for checking out retry configurations.
4299 The next three arguments are a domain name or a complete address, and
4300 optionally two error numbers. All it does is to call the function that
4301 scans the retry configuration data. */
4303 if (test_retry_arg >= 0)
4305 retry_config *yield;
4306 int basic_errno = 0;
4310 if (test_retry_arg >= argc)
4312 printf("-brt needs a domain or address argument\n");
4313 exim_exit(EXIT_FAILURE, US"main");
4315 s1 = argv[test_retry_arg++];
4318 /* If the first argument contains no @ and no . it might be a local user
4319 or it might be a single-component name. Treat as a domain. */
4321 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4323 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4324 "being \ntreated as a one-component domain, not as a local part.\n\n",
4328 /* There may be an optional second domain arg. */
4330 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4331 s2 = argv[test_retry_arg++];
4333 /* The final arg is an error name */
4335 if (test_retry_arg < argc)
4337 uschar *ss = argv[test_retry_arg];
4339 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4342 printf("%s\n", CS error);
4343 return EXIT_FAILURE;
4346 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4347 code > 100 as an error is for matching codes to the decade. Turn them into
4348 a real error code, off the decade. */
4350 if (basic_errno == ERRNO_MAIL4XX ||
4351 basic_errno == ERRNO_RCPT4XX ||
4352 basic_errno == ERRNO_DATA4XX)
4354 int code = (more_errno >> 8) & 255;
4356 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4357 else if (code > 100)
4358 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4362 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4363 printf("No retry information found\n");
4366 more_errno = yield->more_errno;
4367 printf("Retry rule: %s ", yield->pattern);
4369 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4371 printf("quota%s%s ",
4372 (more_errno > 0)? "_" : "",
4373 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4375 else if (yield->basic_errno == ECONNREFUSED)
4377 printf("refused%s%s ",
4378 (more_errno > 0)? "_" : "",
4379 (more_errno == 'M')? "MX" :
4380 (more_errno == 'A')? "A" : "");
4382 else if (yield->basic_errno == ETIMEDOUT)
4385 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4387 if (more_errno != 0) printf("_%s",
4388 (more_errno == 'M')? "MX" : "A");
4391 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4392 printf("auth_failed ");
4395 for (retry_rule * r = yield->rules; r; r = r->next)
4397 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4398 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4404 printf(",%d.", x/1000);
4418 exim_exit(EXIT_SUCCESS, US"main");
4421 /* Handle a request to list one or more configuration options */
4422 /* If -n was set, we suppress some information */
4427 set_process_info("listing variables");
4428 if (recipients_arg >= argc)
4429 fail = !readconf_print(US"all", NULL, flag_n);
4430 else for (i = recipients_arg; i < argc; i++)
4433 (Ustrcmp(argv[i], "router") == 0 ||
4434 Ustrcmp(argv[i], "transport") == 0 ||
4435 Ustrcmp(argv[i], "authenticator") == 0 ||
4436 Ustrcmp(argv[i], "macro") == 0 ||
4437 Ustrcmp(argv[i], "environment") == 0))
4439 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4443 fail = !readconf_print(argv[i], NULL, flag_n);
4445 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4450 set_process_info("listing config");
4451 exim_exit(readconf_print(US"config", NULL, flag_n)
4452 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4456 /* Initialise subsystems as required */
4457 #ifndef DISABLE_DKIM
4463 /* Handle a request to deliver one or more messages that are already on the
4464 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4465 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4467 Delivery of specific messages is typically used for a small number when
4468 prodding by hand (when the option forced_delivery will be set) or when
4469 re-execing to regain root privilege. Each message delivery must happen in a
4470 separate process, so we fork a process for each one, and run them sequentially
4471 so that debugging output doesn't get intertwined, and to avoid spawning too
4472 many processes if a long list is given. However, don't fork for the last one;
4473 this saves a process in the common case when Exim is called to deliver just one
4476 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4478 if (prod_requires_admin && !f.admin_user)
4480 fprintf(stderr, "exim: Permission denied\n");
4481 exim_exit(EXIT_FAILURE, US"main");
4483 set_process_info("delivering specified messages");
4484 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4485 for (i = msg_action_arg; i < argc; i++)
4490 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4491 else if ((pid = fork()) == 0)
4493 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4494 _exit(EXIT_SUCCESS);
4498 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4500 exim_exit(EXIT_FAILURE, US"main");
4504 exim_exit(EXIT_SUCCESS, US"main");
4508 /* If only a single queue run is requested, without SMTP listening, we can just
4509 turn into a queue runner, with an optional starting message id. */
4511 if (queue_interval == 0 && !f.daemon_listen)
4513 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4514 (start_queue_run_id == NULL)? US"" : US" starting at ",
4515 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4516 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4517 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4519 set_process_info("running the '%s' queue (single queue run)", queue_name);
4521 set_process_info("running the queue (single queue run)");
4522 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4523 exim_exit(EXIT_SUCCESS, US"main");
4527 /* Find the login name of the real user running this process. This is always
4528 needed when receiving a message, because it is written into the spool file. It
4529 may also be used to construct a from: or a sender: header, and in this case we
4530 need the user's full name as well, so save a copy of it, checked for RFC822
4531 syntax and munged if necessary, if it hasn't previously been set by the -F
4532 argument. We may try to get the passwd entry more than once, in case NIS or
4533 other delays are in evidence. Save the home directory for use in filter testing
4538 if ((pw = getpwuid(real_uid)) != NULL)
4540 originator_login = string_copy(US pw->pw_name);
4541 originator_home = string_copy(US pw->pw_dir);
4543 /* If user name has not been set by -F, set it from the passwd entry
4544 unless -f has been used to set the sender address by a trusted user. */
4546 if (!originator_name)
4548 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4550 uschar *name = US pw->pw_gecos;
4551 uschar *amp = Ustrchr(name, '&');
4554 /* Most Unix specify that a '&' character in the gecos field is
4555 replaced by a copy of the login name, and some even specify that
4556 the first character should be upper cased, so that's what we do. */
4561 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4562 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4563 buffer[loffset] = toupper(buffer[loffset]);
4567 /* If a pattern for matching the gecos field was supplied, apply
4568 it and then expand the name string. */
4570 if (gecos_pattern && gecos_name)
4573 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4575 if (regex_match_and_setup(re, name, 0, -1))
4577 uschar *new_name = expand_string(gecos_name);
4581 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4582 "gecos field \"%s\"\n", new_name, name);
4585 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4586 "\"%s\": %s\n", gecos_name, expand_string_message);
4588 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4589 "gecos field \"%s\"\n", gecos_pattern, name);
4590 store_free((void *)re);
4592 originator_name = string_copy(name);
4595 /* A trusted caller has used -f but not -F */
4597 else originator_name = US"";
4600 /* Break the retry loop */
4605 if (++i > finduser_retries) break;
4609 /* If we cannot get a user login, log the incident and give up, unless the
4610 configuration specifies something to use. When running in the test harness,
4611 any setting of unknown_login overrides the actual name. */
4613 if (originator_login == NULL || f.running_in_test_harness)
4615 if (unknown_login != NULL)
4617 originator_login = expand_string(unknown_login);
4618 if (originator_name == NULL && unknown_username != NULL)
4619 originator_name = expand_string(unknown_username);
4620 if (originator_name == NULL) originator_name = US"";
4622 if (originator_login == NULL)
4623 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4627 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4630 originator_name = string_copy(parse_fix_phrase(originator_name,
4631 Ustrlen(originator_name), big_buffer, big_buffer_size));
4633 /* If a message is created by this call of Exim, the uid/gid of its originator
4634 are those of the caller. These values are overridden if an existing message is
4635 read in from the spool. */
4637 originator_uid = real_uid;
4638 originator_gid = real_gid;
4640 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4641 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4643 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4644 returns. We leave this till here so that the originator_ fields are available
4645 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4648 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4652 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4653 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4654 "mua_wrapper is set");
4659 /* If the sender ident has not been set (by a trusted caller) set it to
4660 the caller. This will get overwritten below for an inetd call. If a trusted
4661 caller has set it empty, unset it. */
4663 if (sender_ident == NULL) sender_ident = originator_login;
4664 else if (sender_ident[0] == 0) sender_ident = NULL;
4666 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4667 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4668 originator_* variables set. */
4670 if (test_rewrite_arg >= 0)
4672 f.really_exim = FALSE;
4673 if (test_rewrite_arg >= argc)
4675 printf("-brw needs an address argument\n");
4676 exim_exit(EXIT_FAILURE, US"main");
4678 rewrite_test(argv[test_rewrite_arg]);
4679 exim_exit(EXIT_SUCCESS, US"main");
4682 /* A locally-supplied message is considered to be coming from a local user
4683 unless a trusted caller supplies a sender address with -f, or is passing in the
4684 message via SMTP (inetd invocation or otherwise). */
4686 if ((sender_address == NULL && !smtp_input) ||
4687 (!f.trusted_caller && filter_test == FTEST_NONE))
4689 f.sender_local = TRUE;
4691 /* A trusted caller can supply authenticated_sender and authenticated_id
4692 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4693 defaults except when host checking. */
4695 if (authenticated_sender == NULL && !host_checking)
4696 authenticated_sender = string_sprintf("%s@%s", originator_login,
4697 qualify_domain_sender);
4698 if (authenticated_id == NULL && !host_checking)
4699 authenticated_id = originator_login;
4702 /* Trusted callers are always permitted to specify the sender address.
4703 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4704 is specified is the empty address. However, if a trusted caller does not
4705 specify a sender address for SMTP input, we leave sender_address unset. This
4706 causes the MAIL commands to be honoured. */
4708 if ((!smtp_input && sender_address == NULL) ||
4709 !receive_check_set_sender(sender_address))
4711 /* Either the caller is not permitted to set a general sender, or this is
4712 non-SMTP input and the trusted caller has not set a sender. If there is no
4713 sender, or if a sender other than <> is set, override with the originator's
4714 login (which will get qualified below), except when checking things. */
4716 if (sender_address == NULL /* No sender_address set */
4718 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4719 !checking)) /* Not running tests, including filter tests */
4721 sender_address = originator_login;
4722 f.sender_address_forced = FALSE;
4723 sender_address_domain = 0;
4727 /* Remember whether an untrusted caller set the sender address */
4729 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4731 /* Ensure that the sender address is fully qualified unless it is the empty
4732 address, which indicates an error message, or doesn't exist (root caller, smtp
4733 interface, no -f argument). */
4735 if (sender_address != NULL && sender_address[0] != 0 &&
4736 sender_address_domain == 0)
4737 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4738 qualify_domain_sender);
4740 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4742 /* Handle a request to verify a list of addresses, or test them for delivery.
4743 This must follow the setting of the sender address, since routers can be
4744 predicated upon the sender. If no arguments are given, read addresses from
4745 stdin. Set debug_level to at least D_v to get full output for address testing.
4748 if (verify_address_mode || f.address_test_mode)
4751 int flags = vopt_qualify;
4753 if (verify_address_mode)
4755 if (!verify_as_sender) flags |= vopt_is_recipient;
4756 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4761 flags |= vopt_is_recipient;
4762 debug_selector |= D_v;
4763 debug_file = stderr;
4764 debug_fd = fileno(debug_file);
4765 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4768 if (recipients_arg < argc)
4770 while (recipients_arg < argc)
4772 uschar *s = argv[recipients_arg++];
4775 BOOL finished = FALSE;
4776 uschar *ss = parse_find_address_end(s, FALSE);
4777 if (*ss == ',') *ss = 0; else finished = TRUE;
4778 test_address(s, flags, &exit_value);
4781 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4788 uschar *s = get_stdinput(NULL, NULL);
4789 if (s == NULL) break;
4790 test_address(s, flags, &exit_value);
4794 exim_exit(exit_value, US"main");
4797 /* Handle expansion checking. Either expand items on the command line, or read
4798 from stdin if there aren't any. If -Mset was specified, load the message so
4799 that its variables can be used, but restrict this facility to admin users.
4800 Otherwise, if -bem was used, read a message from stdin. */
4804 dns_init(FALSE, FALSE, FALSE);
4805 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4807 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4809 exim_fail("exim: permission denied\n");
4810 message_id = argv[msg_action_arg];
4811 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4812 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4813 printf ("Failed to load message datafile %s\n", message_id);
4814 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4815 printf ("Failed to load message %s\n", message_id);
4818 /* Read a test message from a file. We fudge it up to be on stdin, saving
4819 stdin itself for later reading of expansion strings. */
4821 else if (expansion_test_message)
4823 int save_stdin = dup(0);
4824 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4826 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
4829 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4830 message_ended = END_NOTENDED;
4831 read_message_body(receive_msg(extract_recipients));
4832 message_linecount += body_linecount;
4833 (void)dup2(save_stdin, 0);
4834 (void)close(save_stdin);
4835 clearerr(stdin); /* Required by Darwin */
4838 /* Only admin users may see config-file macros this way */
4840 if (!f.admin_user) macros_user = macros = mlast = NULL;
4842 /* Allow $recipients for this testing */
4844 f.enable_dollar_recipients = TRUE;
4846 /* Expand command line items */
4848 if (recipients_arg < argc)
4849 while (recipients_arg < argc)
4850 expansion_test_line(argv[recipients_arg++]);
4856 char *(*fn_readline)(const char *) = NULL;
4857 void (*fn_addhist)(const char *) = NULL;
4861 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4864 while (s = get_stdinput(fn_readline, fn_addhist))
4865 expansion_test_line(s);
4868 if (dlhandle) dlclose(dlhandle);
4872 /* The data file will be open after -Mset */
4874 if (deliver_datafile >= 0)
4876 (void)close(deliver_datafile);
4877 deliver_datafile = -1;
4880 exim_exit(EXIT_SUCCESS, US"main: expansion test");
4884 /* The active host name is normally the primary host name, but it can be varied
4885 for hosts that want to play several parts at once. We need to ensure that it is
4886 set for host checking, and for receiving messages. */
4888 smtp_active_hostname = primary_hostname;
4889 if (raw_active_hostname != NULL)
4891 uschar *nah = expand_string(raw_active_hostname);
4894 if (!f.expand_string_forcedfail)
4895 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4896 "(smtp_active_hostname): %s", raw_active_hostname,
4897 expand_string_message);
4899 else if (nah[0] != 0) smtp_active_hostname = nah;
4902 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4903 given IP address so that the blocking and relay configuration can be tested.
4904 Unless a sender_ident was set by -oMt, we discard it (the default is the
4905 caller's login name). An RFC 1413 call is made only if we are running in the
4906 test harness and an incoming interface and both ports are specified, because
4907 there is no TCP/IP call to find the ident for. */
4914 if (!sender_ident_set)
4916 sender_ident = NULL;
4917 if (f.running_in_test_harness && sender_host_port != 0 &&
4918 interface_address != NULL && interface_port != 0)
4919 verify_get_ident(1413);
4922 /* In case the given address is a non-canonical IPv6 address, canonicalize
4923 it. The code works for both IPv4 and IPv6, as it happens. */
4925 size = host_aton(sender_host_address, x);
4926 sender_host_address = store_get(48); /* large enough for full IPv6 */
4927 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4929 /* Now set up for testing */
4931 host_build_sender_fullhost();
4935 f.sender_local = FALSE;
4936 f.sender_host_notsocket = TRUE;
4937 debug_file = stderr;
4938 debug_fd = fileno(debug_file);
4939 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4940 "**** but without any ident (RFC 1413) callback.\n"
4941 "**** This is not for real!\n\n",
4942 sender_host_address);
4944 memset(sender_host_cache, 0, sizeof(sender_host_cache));
4945 if (verify_check_host(&hosts_connection_nolog) == OK)
4946 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
4947 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4949 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4950 because a log line has already been written for all its failure exists
4951 (usually "connection refused: <reason>") and writing another one is
4952 unnecessary clutter. */
4954 if (smtp_start_session())
4956 for (reset_point = store_get(0); ; store_reset(reset_point))
4958 if (smtp_setup_msg() <= 0) break;
4959 if (!receive_msg(FALSE)) break;
4961 return_path = sender_address = NULL;
4962 dnslist_domain = dnslist_matched = NULL;
4963 #ifndef DISABLE_DKIM
4964 dkim_cur_signer = NULL;
4967 deliver_localpart_orig = NULL;
4968 deliver_domain_orig = NULL;
4969 callout_address = sending_ip_address = NULL;
4970 sender_rate = sender_rate_limit = sender_rate_period = NULL;
4974 exim_exit(EXIT_SUCCESS, US"main");
4978 /* Arrange for message reception if recipients or SMTP were specified;
4979 otherwise complain unless a version print (-bV) happened or this is a filter
4980 verification test or info dump.
4981 In the former case, show the configuration file name. */
4983 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4985 if (version_printed)
4987 if (Ustrchr(config_main_filelist, ':'))
4988 printf("Configuration file search path is %s\n", config_main_filelist);
4989 printf("Configuration file is %s\n", config_main_filename);
4990 return EXIT_SUCCESS;
4993 if (info_flag != CMDINFO_NONE)
4995 show_exim_information(info_flag, info_stdout ? stdout : stderr);
4996 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
4999 if (filter_test == FTEST_NONE)
5000 exim_usage(called_as);
5004 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5005 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5006 that we are not called from inetd, because that is rejected above. The
5007 following configuration settings are forced here:
5009 (1) Synchronous delivery (-odi)
5010 (2) Errors to stderr (-oep == -oeq)
5011 (3) No parallel remote delivery
5012 (4) Unprivileged delivery
5014 We don't force overall queueing options because there are several of them;
5015 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5016 to override any SMTP queueing. */
5020 f.synchronous_delivery = TRUE;
5021 arg_error_handling = ERRORS_STDERR;
5022 remote_max_parallel = 1;
5023 deliver_drop_privilege = TRUE;
5024 f.queue_smtp = FALSE;
5025 queue_smtp_domains = NULL;
5027 message_utf8_downconvert = -1; /* convert-if-needed */
5032 /* Prepare to accept one or more new messages on the standard input. When a
5033 message has been read, its id is returned in message_id[]. If doing immediate
5034 delivery, we fork a delivery process for each received message, except for the
5035 last one, where we can save a process switch.
5037 It is only in non-smtp mode that error_handling is allowed to be changed from
5038 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5039 sendmail error modes other than -oem ever actually used? Later: yes.) */
5041 if (!smtp_input) error_handling = arg_error_handling;
5043 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5044 logging being sent down the socket and make an identd call to get the
5047 else if (f.is_inetd)
5049 (void)fclose(stderr);
5050 exim_nullstd(); /* Re-open to /dev/null */
5051 verify_get_ident(IDENT_PORT);
5052 host_build_sender_fullhost();
5053 set_process_info("handling incoming connection from %s via inetd",
5057 /* If the sender host address has been set, build sender_fullhost if it hasn't
5058 already been done (which it will have been for inetd). This caters for the
5059 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5060 so that the test for IP options is skipped for -bs input. */
5062 if (sender_host_address && !sender_fullhost)
5064 host_build_sender_fullhost();
5065 set_process_info("handling incoming connection from %s via -oMa",
5067 f.sender_host_notsocket = TRUE;
5070 /* Otherwise, set the sender host as unknown except for inetd calls. This
5071 prevents host checking in the case of -bs not from inetd and also for -bS. */
5073 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5075 /* If stdout does not exist, then dup stdin to stdout. This can happen
5076 if exim is started from inetd. In this case fd 0 will be set to the socket,
5077 but fd 1 will not be set. This also happens for passed SMTP channels. */
5079 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5081 /* Set up the incoming protocol name and the state of the program. Root is
5082 allowed to force received protocol via the -oMr option above. If we have come
5083 via inetd, the process info has already been set up. We don't set
5084 received_protocol here for smtp input, as it varies according to
5085 batch/HELO/EHLO/AUTH/TLS. */
5089 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5090 smtp_batched_input? "batched " : "",
5091 (sender_address!= NULL)? sender_address : originator_login);
5095 int old_pool = store_pool;
5096 store_pool = POOL_PERM;
5097 if (!received_protocol)
5098 received_protocol = string_sprintf("local%s", called_as);
5099 store_pool = old_pool;
5100 set_process_info("accepting a local non-SMTP message from <%s>",
5104 /* Initialize the session_local_queue-only flag (this will be ignored if
5105 mua_wrapper is set) */
5108 session_local_queue_only = queue_only;
5110 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5111 the spool if so configured. On failure, we must not attempt to send an error
5112 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5113 error code is given.) */
5115 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5116 exim_fail("exim: insufficient disk space\n");
5118 /* If this is smtp input of any kind, real or batched, handle the start of the
5121 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5122 because a log line has already been written for all its failure exists
5123 (usually "connection refused: <reason>") and writing another one is
5124 unnecessary clutter. */
5130 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5131 if (verify_check_host(&hosts_connection_nolog) == OK)
5132 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5133 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5134 if (!smtp_start_session())
5137 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5141 /* Otherwise, set up the input size limit here. */
5145 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5146 if (expand_string_message)
5147 if (thismessage_size_limit == -1)
5148 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5149 "message_size_limit: %s", expand_string_message);
5151 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5152 "message_size_limit: %s", expand_string_message);
5155 /* Loop for several messages when reading SMTP input. If we fork any child
5156 processes, we don't want to wait for them unless synchronous delivery is
5157 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5158 same as SIG_DFL, despite the fact that documentation often lists the default as
5159 "ignore". This is a confusing area. This is what I know:
5161 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5162 processes that complete simply to go away without ever becoming defunct. You
5163 can't then wait for them - but we don't want to wait for them in the
5164 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5165 happen for all OS (e.g. *BSD is different).
5167 But that's not the end of the story. Some (many? all?) systems have the
5168 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5169 has by default, so it seems that the difference is merely one of default
5170 (compare restarting vs non-restarting signals).
5172 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5173 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5174 of the loop below. Paranoia rules.
5176 February 2003: That's *still* not the end of the story. There are now versions
5177 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5178 process then calls waitpid(), a grumble is written to the system log, because
5179 this is logically inconsistent. In other words, it doesn't like the paranoia.
5180 As a consequence of this, the waitpid() below is now excluded if we are sure
5181 that SIG_IGN works. */
5183 if (!f.synchronous_delivery)
5186 struct sigaction act;
5187 act.sa_handler = SIG_IGN;
5188 sigemptyset(&(act.sa_mask));
5189 act.sa_flags = SA_NOCLDWAIT;
5190 sigaction(SIGCHLD, &act, NULL);
5192 signal(SIGCHLD, SIG_IGN);
5196 /* Save the current store pool point, for resetting at the start of
5197 each message, and save the real sender address, if any. */
5199 reset_point = store_get(0);
5200 real_sender_address = sender_address;
5202 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5203 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5210 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5211 input and build the recipients list, before calling receive_msg() to read the
5212 message proper. Whatever sender address is given in the SMTP transaction is
5213 often ignored for local senders - we use the actual sender, which is normally
5214 either the underlying user running this process or a -f argument provided by
5215 a trusted caller. It is saved in real_sender_address. The test for whether to
5216 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5221 if ((rc = smtp_setup_msg()) > 0)
5223 if (real_sender_address != NULL &&
5224 !receive_check_set_sender(sender_address))
5226 sender_address = raw_sender = real_sender_address;
5227 sender_address_unrewritten = NULL;
5230 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5231 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5232 the very end. The result of the ACL is ignored (as for other non-SMTP
5233 messages). It is run for its potential side effects. */
5235 if (smtp_batched_input && acl_not_smtp_start != NULL)
5237 uschar *user_msg, *log_msg;
5238 f.enable_dollar_recipients = TRUE;
5239 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5240 &user_msg, &log_msg);
5241 f.enable_dollar_recipients = FALSE;
5244 /* Now get the data for the message */
5246 more = receive_msg(extract_recipients);
5247 if (message_id[0] == 0)
5249 cancel_cutthrough_connection(TRUE, US"receive dropped");
5250 if (more) goto moreloop;
5251 smtp_log_no_mail(); /* Log no mail if configured */
5252 exim_exit(EXIT_FAILURE, US"receive toplevel");
5257 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5258 smtp_log_no_mail(); /* Log no mail if configured */
5259 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5263 /* In the non-SMTP case, we have all the information from the command
5264 line, but must process it in case it is in the more general RFC822
5265 format, and in any case, to detect syntax errors. Also, it appears that
5266 the use of comma-separated lists as single arguments is common, so we
5267 had better support them. */
5272 int count = argc - recipients_arg;
5273 uschar **list = argv + recipients_arg;
5275 /* These options cannot be changed dynamically for non-SMTP messages */
5277 f.active_local_sender_retain = local_sender_retain;
5278 f.active_local_from_check = local_from_check;
5280 /* Save before any rewriting */
5282 raw_sender = string_copy(sender_address);
5284 /* Loop for each argument */
5286 for (int i = 0; i < count; i++)
5288 int start, end, domain;
5290 uschar *s = list[i];
5292 /* Loop for each comma-separated address */
5296 BOOL finished = FALSE;
5298 uschar *ss = parse_find_address_end(s, FALSE);
5300 if (*ss == ',') *ss = 0; else finished = TRUE;
5302 /* Check max recipients - if -t was used, these aren't recipients */
5304 if (recipients_max > 0 && ++rcount > recipients_max &&
5305 !extract_recipients)
5306 if (error_handling == ERRORS_STDERR)
5308 fprintf(stderr, "exim: too many recipients\n");
5309 exim_exit(EXIT_FAILURE, US"main");
5313 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5314 errors_sender_rc : EXIT_FAILURE;
5318 BOOL b = allow_utf8_domains;
5319 allow_utf8_domains = TRUE;
5322 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5325 if (string_is_utf8(recipient))
5326 message_smtputf8 = TRUE;
5328 allow_utf8_domains = b;
5331 if (domain == 0 && !f.allow_unqualified_recipient)
5334 errmess = US"unqualified recipient address not allowed";
5337 if (recipient == NULL)
5339 if (error_handling == ERRORS_STDERR)
5341 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5342 string_printing(list[i]), errmess);
5343 exim_exit(EXIT_FAILURE, US"main");
5349 eblock.text1 = string_printing(list[i]);
5350 eblock.text2 = errmess;
5352 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5353 errors_sender_rc : EXIT_FAILURE;
5357 receive_add_recipient(recipient, -1);
5360 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5364 /* Show the recipients when debugging */
5368 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5369 if (recipients_list != NULL)
5371 debug_printf("Recipients:\n");
5372 for (int i = 0; i < recipients_count; i++)
5373 debug_printf(" %s\n", recipients_list[i].address);
5377 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5378 ignored; rejecting here would just add complication, and it can just as
5379 well be done later. Allow $recipients to be visible in the ACL. */
5381 if (acl_not_smtp_start)
5383 uschar *user_msg, *log_msg;
5384 f.enable_dollar_recipients = TRUE;
5385 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5386 &user_msg, &log_msg);
5387 f.enable_dollar_recipients = FALSE;
5390 /* Pause for a while waiting for input. If none received in that time,
5391 close the logfile, if we had one open; then if we wait for a long-running
5392 datasource (months, in one use-case) log rotation will not leave us holding
5395 if (!receive_timeout)
5397 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5400 FD_ZERO(&r); FD_SET(0, &r);
5401 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5404 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5405 will just read the headers for the message, and not write anything onto the
5408 message_ended = END_NOTENDED;
5409 more = receive_msg(extract_recipients);
5411 /* more is always FALSE here (not SMTP message) when reading a message
5412 for real; when reading the headers of a message for filter testing,
5413 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5415 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5416 } /* Non-SMTP message reception */
5418 /* If this is a filter testing run, there are headers in store, but
5419 no message on the spool. Run the filtering code in testing mode, setting
5420 the domain to the qualify domain and the local part to the current user,
5421 unless they have been set by options. The prefix and suffix are left unset
5422 unless specified. The the return path is set to to the sender unless it has
5423 already been set from a return-path header in the message. */
5425 if (filter_test != FTEST_NONE)
5427 deliver_domain = (ftest_domain != NULL)?
5428 ftest_domain : qualify_domain_recipient;
5429 deliver_domain_orig = deliver_domain;
5430 deliver_localpart = (ftest_localpart != NULL)?
5431 ftest_localpart : originator_login;
5432 deliver_localpart_orig = deliver_localpart;
5433 deliver_localpart_prefix = ftest_prefix;
5434 deliver_localpart_suffix = ftest_suffix;
5435 deliver_home = originator_home;
5437 if (return_path == NULL)
5439 printf("Return-path copied from sender\n");
5440 return_path = string_copy(sender_address);
5443 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5444 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5446 receive_add_recipient(
5447 string_sprintf("%s%s%s@%s",
5448 (ftest_prefix == NULL)? US"" : ftest_prefix,
5450 (ftest_suffix == NULL)? US"" : ftest_suffix,
5451 deliver_domain), -1);
5453 printf("Recipient = %s\n", recipients_list[0].address);
5454 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5455 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5457 if (chdir("/")) /* Get away from wherever the user is running this from */
5459 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5460 exim_exit(EXIT_FAILURE, US"main");
5463 /* Now we run either a system filter test, or a user filter test, or both.
5464 In the latter case, headers added by the system filter will persist and be
5465 available to the user filter. We need to copy the filter variables
5468 if ((filter_test & FTEST_SYSTEM) != 0)
5469 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5470 exim_exit(EXIT_FAILURE, US"main");
5472 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5474 if ((filter_test & FTEST_USER) != 0)
5475 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5476 exim_exit(EXIT_FAILURE, US"main");
5478 exim_exit(EXIT_SUCCESS, US"main");
5481 /* Else act on the result of message reception. We should not get here unless
5482 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5483 will be TRUE. If it is not, check on the number of messages received in this
5486 if (!session_local_queue_only &&
5487 smtp_accept_queue_per_connection > 0 &&
5488 receive_messagecount > smtp_accept_queue_per_connection)
5490 session_local_queue_only = TRUE;
5491 queue_only_reason = 2;
5494 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5495 and queue_only_load is set, check that the load average is below it. If it is
5496 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5497 default), we put the whole session into queue_only mode. It then remains this
5498 way for any subsequent messages on the same SMTP connection. This is a
5499 deliberate choice; even though the load average may fall, it doesn't seem
5500 right to deliver later messages on the same call when not delivering earlier
5501 ones. However, there are odd cases where this is not wanted, so this can be
5502 changed by setting queue_only_load_latch false. */
5504 local_queue_only = session_local_queue_only;
5505 if (!local_queue_only && queue_only_load >= 0)
5507 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5508 if (local_queue_only)
5510 queue_only_reason = 3;
5511 if (queue_only_load_latch) session_local_queue_only = TRUE;
5515 /* If running as an MUA wrapper, all queueing options and freezing options
5519 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5521 /* Log the queueing here, when it will get a message id attached, but
5522 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5525 if (local_queue_only)
5527 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5528 switch(queue_only_reason)
5531 log_write(L_delay_delivery,
5532 LOG_MAIN, "no immediate delivery: more than %d messages "
5533 "received in one connection", smtp_accept_queue_per_connection);
5537 log_write(L_delay_delivery,
5538 LOG_MAIN, "no immediate delivery: load average %.2f",
5539 (double)load_average/1000.0);
5544 else if (f.queue_only_policy || f.deliver_freeze)
5545 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5547 /* Else do the delivery unless the ACL or local_scan() called for queue only
5548 or froze the message. Always deliver in a separate process. A fork failure is
5549 not a disaster, as the delivery will eventually happen on a subsequent queue
5550 run. The search cache must be tidied before the fork, as the parent will
5551 do it before exiting. The child will trigger a lookup failure and
5552 thereby defer the delivery if it tries to use (for example) a cached ldap
5553 connection that the parent has called unbind on. */
5560 if ((pid = fork()) == 0)
5563 close_unwanted(); /* Close unwanted file descriptors and TLS */
5564 exim_nullstd(); /* Ensure std{in,out,err} exist */
5566 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5567 mode, deliver_drop_privilege is forced TRUE). */
5569 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5571 delivery_re_exec(CEE_EXEC_EXIT);
5572 /* Control does not return here. */
5575 /* No need to re-exec */
5577 rc = deliver_message(message_id, FALSE, FALSE);
5579 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5580 EXIT_SUCCESS : EXIT_FAILURE);
5585 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5586 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5587 "process: %s", strerror(errno));
5591 release_cutthrough_connection(US"msg passed for delivery");
5593 /* In the parent, wait if synchronous delivery is required. This will
5594 always be the case in MUA wrapper mode. */
5596 if (f.synchronous_delivery)
5599 while (wait(&status) != pid);
5600 if ((status & 0x00ff) != 0)
5601 log_write(0, LOG_MAIN|LOG_PANIC,
5602 "process %d crashed with signal %d while delivering %s",
5603 (int)pid, status & 0x00ff, message_id);
5604 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5609 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5610 automatically reaps children (see comments above the loop), clear away any
5611 finished subprocesses here, in case there are lots of messages coming in
5612 from the same source. */
5614 #ifndef SIG_IGN_WORKS
5615 while (waitpid(-1, NULL, WNOHANG) > 0);
5619 return_path = sender_address = NULL;
5620 authenticated_sender = NULL;
5621 deliver_localpart_orig = NULL;
5622 deliver_domain_orig = NULL;
5623 deliver_host = deliver_host_address = NULL;
5624 dnslist_domain = dnslist_matched = NULL;
5625 #ifdef WITH_CONTENT_SCAN
5626 malware_name = NULL;
5628 callout_address = NULL;
5629 sending_ip_address = NULL;
5631 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5633 store_reset(reset_point);
5636 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5637 return 0; /* To stop compiler warning */