1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
15 #if defined(__GLIBC__) && !defined(__UCLIBC__)
16 # include <gnu/libc-version.h>
20 # include <gnutls/gnutls.h>
21 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
26 extern void init_lookup_list(void);
30 /*************************************************
31 * Function interface to store functions *
32 *************************************************/
34 /* We need some real functions to pass to the PCRE regular expression library
35 for store allocation via Exim's store manager. The normal calls are actually
36 macros that pass over location information to make tracing easier. These
37 functions just interface to the standard macro calls. A good compiler will
38 optimize out the tail recursion and so not make them too expensive. There
39 are two sets of functions; one for use when we want to retain the compiled
40 regular expression for a long time; the other for short-term use. */
43 function_store_get(size_t size)
45 return store_get((int)size);
49 function_dummy_free(void *block) { block = block; }
52 function_store_malloc(size_t size)
54 return store_malloc((int)size);
58 function_store_free(void *block)
66 /*************************************************
67 * Enums for cmdline interface *
68 *************************************************/
70 enum commandline_info { CMDINFO_NONE=0,
71 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
76 /*************************************************
77 * Compile regular expression and panic on fail *
78 *************************************************/
80 /* This function is called when failure to compile a regular expression leads
81 to a panic exit. In other cases, pcre_compile() is called directly. In many
82 cases where this function is used, the results of the compilation are to be
83 placed in long-lived store, so we temporarily reset the store management
84 functions that PCRE uses if the use_malloc flag is set.
87 pattern the pattern to compile
88 caseless TRUE if caseless matching is required
89 use_malloc TRUE if compile into malloc store
91 Returns: pointer to the compiled pattern
95 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
98 int options = PCRE_COPT;
103 pcre_malloc = function_store_malloc;
104 pcre_free = function_store_free;
106 if (caseless) options |= PCRE_CASELESS;
107 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
108 pcre_malloc = function_store_get;
109 pcre_free = function_dummy_free;
111 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
112 "%s at offset %d while compiling %s", error, offset, pattern);
119 /*************************************************
120 * Execute regular expression and set strings *
121 *************************************************/
123 /* This function runs a regular expression match, and sets up the pointers to
124 the matched substrings.
127 re the compiled expression
128 subject the subject string
129 options additional PCRE options
130 setup if < 0 do full setup
131 if >= 0 setup from setup+1 onwards,
132 excluding the full matched string
134 Returns: TRUE or FALSE
138 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
140 int ovector[3*(EXPAND_MAXN+1)];
141 uschar * s = string_copy(subject); /* de-constifying */
142 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
143 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
145 if (n == 0) n = EXPAND_MAXN + 1;
149 expand_nmax = (setup < 0)? 0 : setup + 1;
150 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
152 expand_nstring[expand_nmax] = s + ovector[nn];
153 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
163 /*************************************************
164 * Set up processing details *
165 *************************************************/
167 /* Save a text string for dumping when SIGUSR1 is received.
168 Do checks for overruns.
170 Arguments: format and arguments, as for printf()
175 set_process_info(const char *format, ...)
177 int len = sprintf(CS process_info, "%5d ", (int)getpid());
179 va_start(ap, format);
180 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
181 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
182 len = Ustrlen(process_info);
183 process_info[len+0] = '\n';
184 process_info[len+1] = '\0';
185 process_info_len = len + 1;
186 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
190 /***********************************************
191 * Handler for SIGTERM *
192 ***********************************************/
195 term_handler(int sig)
201 /*************************************************
202 * Handler for SIGUSR1 *
203 *************************************************/
205 /* SIGUSR1 causes any exim process to write to the process log details of
206 what it is currently doing. It will only be used if the OS is capable of
207 setting up a handler that causes automatic restarting of any system call
208 that is in progress at the time.
210 This function takes care to be signal-safe.
212 Argument: the signal number (SIGUSR1)
217 usr1_handler(int sig)
221 os_restarting_signal(sig, usr1_handler);
223 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
225 /* If we are already running as the Exim user, try to create it in the
226 current process (assuming spool_directory exists). Otherwise, if we are
227 root, do the creation in an exim:exim subprocess. */
229 int euid = geteuid();
230 if (euid == exim_uid)
231 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
232 else if (euid == root_uid)
233 fd = log_create_as_exim(process_log_path);
236 /* If we are neither exim nor root, or if we failed to create the log file,
237 give up. There is not much useful we can do with errors, since we don't want
238 to disrupt whatever is going on outside the signal handler. */
242 (void)write(fd, process_info, process_info_len);
248 /*************************************************
250 *************************************************/
252 /* This handler is enabled most of the time that Exim is running. The handler
253 doesn't actually get used unless alarm() has been called to set a timer, to
254 place a time limit on a system call of some kind. When the handler is run, it
257 There are some other SIGALRM handlers that are used in special cases when more
258 than just a flag setting is required; for example, when reading a message's
259 input. These are normally set up in the code module that uses them, and the
260 SIGALRM handler is reset to this one afterwards.
262 Argument: the signal value (SIGALRM)
267 sigalrm_handler(int sig)
269 sig = sig; /* Keep picky compilers happy */
271 os_non_restarting_signal(SIGALRM, sigalrm_handler);
276 /*************************************************
277 * Sleep for a fractional time interval *
278 *************************************************/
280 /* This function is called by millisleep() and exim_wait_tick() to wait for a
281 period of time that may include a fraction of a second. The coding is somewhat
282 tedious. We do not expect setitimer() ever to fail, but if it does, the process
283 will wait for ever, so we panic in this instance. (There was a case of this
284 when a bug in a function that calls milliwait() caused it to pass invalid data.
285 That's when I added the check. :-)
287 We assume it to be not worth sleeping for under 100us; this value will
288 require revisiting as hardware advances. This avoids the issue of
289 a zero-valued timer setting meaning "never fire".
291 Argument: an itimerval structure containing the interval
296 milliwait(struct itimerval *itval)
299 sigset_t old_sigmask;
301 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
303 (void)sigemptyset(&sigmask); /* Empty mask */
304 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
305 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
306 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
307 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
308 "setitimer() failed: %s", strerror(errno));
309 (void)sigfillset(&sigmask); /* All signals */
310 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
311 (void)sigsuspend(&sigmask); /* Until SIGALRM */
312 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
318 /*************************************************
319 * Millisecond sleep function *
320 *************************************************/
322 /* The basic sleep() function has a granularity of 1 second, which is too rough
323 in some cases - for example, when using an increasing delay to slow down
326 Argument: number of millseconds
333 struct itimerval itval;
334 itval.it_interval.tv_sec = 0;
335 itval.it_interval.tv_usec = 0;
336 itval.it_value.tv_sec = msec/1000;
337 itval.it_value.tv_usec = (msec % 1000) * 1000;
343 /*************************************************
344 * Compare microsecond times *
345 *************************************************/
352 Returns: -1, 0, or +1
356 exim_tvcmp(struct timeval *t1, struct timeval *t2)
358 if (t1->tv_sec > t2->tv_sec) return +1;
359 if (t1->tv_sec < t2->tv_sec) return -1;
360 if (t1->tv_usec > t2->tv_usec) return +1;
361 if (t1->tv_usec < t2->tv_usec) return -1;
368 /*************************************************
369 * Clock tick wait function *
370 *************************************************/
372 /* Exim uses a time + a pid to generate a unique identifier in two places: its
373 message IDs, and in file names for maildir deliveries. Because some OS now
374 re-use pids within the same second, sub-second times are now being used.
375 However, for absolute certainty, we must ensure the clock has ticked before
376 allowing the relevant process to complete. At the time of implementation of
377 this code (February 2003), the speed of processors is such that the clock will
378 invariably have ticked already by the time a process has done its job. This
379 function prepares for the time when things are faster - and it also copes with
380 clocks that go backwards.
383 then_tv A timeval which was used to create uniqueness; its usec field
384 has been rounded down to the value of the resolution.
385 We want to be sure the current time is greater than this.
386 resolution The resolution that was used to divide the microseconds
387 (1 for maildir, larger for message ids)
393 exim_wait_tick(struct timeval *then_tv, int resolution)
395 struct timeval now_tv;
396 long int now_true_usec;
398 (void)gettimeofday(&now_tv, NULL);
399 now_true_usec = now_tv.tv_usec;
400 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
402 if (exim_tvcmp(&now_tv, then_tv) <= 0)
404 struct itimerval itval;
405 itval.it_interval.tv_sec = 0;
406 itval.it_interval.tv_usec = 0;
407 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
408 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
410 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
411 negative value for the microseconds is possible only in the case when "now"
412 is more than a second less than "then". That means that itval.it_value.tv_sec
413 is greater than zero. The following correction is therefore safe. */
415 if (itval.it_value.tv_usec < 0)
417 itval.it_value.tv_usec += 1000000;
418 itval.it_value.tv_sec -= 1;
421 DEBUG(D_transport|D_receive)
423 if (!f.running_in_test_harness)
425 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
426 then_tv->tv_sec, (long) then_tv->tv_usec,
427 now_tv.tv_sec, (long) now_tv.tv_usec);
428 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
429 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
440 /*************************************************
441 * Call fopen() with umask 777 and adjust mode *
442 *************************************************/
444 /* Exim runs with umask(0) so that files created with open() have the mode that
445 is specified in the open() call. However, there are some files, typically in
446 the spool directory, that are created with fopen(). They end up world-writeable
447 if no precautions are taken. Although the spool directory is not accessible to
448 the world, this is an untidiness. So this is a wrapper function for fopen()
449 that sorts out the mode of the created file.
452 filename the file name
453 options the fopen() options
454 mode the required mode
456 Returns: the fopened FILE or NULL
460 modefopen(const uschar *filename, const char *options, mode_t mode)
462 mode_t saved_umask = umask(0777);
463 FILE *f = Ufopen(filename, options);
464 (void)umask(saved_umask);
465 if (f != NULL) (void)fchmod(fileno(f), mode);
472 /*************************************************
473 * Ensure stdin, stdout, and stderr exist *
474 *************************************************/
476 /* Some operating systems grumble if an exec() happens without a standard
477 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
478 file will be opened and will use these fd values, and then some other bit of
479 code will assume, for example, that it can write error messages to stderr.
480 This function ensures that fds 0, 1, and 2 are open if they do not already
481 exist, by connecting them to /dev/null.
483 This function is also used to ensure that std{in,out,err} exist at all times,
484 so that if any library that Exim calls tries to use them, it doesn't crash.
496 for (i = 0; i <= 2; i++)
498 if (fstat(i, &statbuf) < 0 && errno == EBADF)
500 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
501 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
502 string_open_failed(errno, "/dev/null"));
503 if (devnull != i) (void)dup2(devnull, i);
506 if (devnull > 2) (void)close(devnull);
512 /*************************************************
513 * Close unwanted file descriptors for delivery *
514 *************************************************/
516 /* This function is called from a new process that has been forked to deliver
517 an incoming message, either directly, or using exec.
519 We want any smtp input streams to be closed in this new process. However, it
520 has been observed that using fclose() here causes trouble. When reading in -bS
521 input, duplicate copies of messages have been seen. The files will be sharing a
522 file pointer with the parent process, and it seems that fclose() (at least on
523 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
524 least sometimes. Hence we go for closing the underlying file descriptors.
526 If TLS is active, we want to shut down the TLS library, but without molesting
527 the parent's SSL connection.
529 For delivery of a non-SMTP message, we want to close stdin and stdout (and
530 stderr unless debugging) because the calling process might have set them up as
531 pipes and be waiting for them to close before it waits for the submission
532 process to terminate. If they aren't closed, they hold up the calling process
533 until the initial delivery process finishes, which is not what we want.
535 Exception: We do want it for synchronous delivery!
537 And notwithstanding all the above, if D_resolver is set, implying resolver
538 debugging, leave stdout open, because that's where the resolver writes its
541 When we close stderr (which implies we've also closed stdout), we also get rid
542 of any controlling terminal.
554 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
556 (void)close(fileno(smtp_in));
557 (void)close(fileno(smtp_out));
562 (void)close(0); /* stdin */
563 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
564 if (debug_selector == 0) /* stderr */
566 if (!f.synchronous_delivery)
579 /*************************************************
581 *************************************************/
583 /* This function sets a new uid and gid permanently, optionally calling
584 initgroups() to set auxiliary groups. There are some special cases when running
585 Exim in unprivileged modes. In these situations the effective uid will not be
586 root; if we already have the right effective uid/gid, and don't need to
587 initialize any groups, leave things as they are.
592 igflag TRUE if initgroups() wanted
593 msg text to use in debugging output and failure log
595 Returns: nothing; bombs out on failure
599 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
601 uid_t euid = geteuid();
602 gid_t egid = getegid();
604 if (euid == root_uid || euid != uid || egid != gid || igflag)
606 /* At least one OS returns +1 for initgroups failure, so just check for
611 struct passwd *pw = getpwuid(uid);
614 if (initgroups(pw->pw_name, gid) != 0)
615 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
616 (long int)uid, strerror(errno));
618 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
619 "no passwd entry for uid=%ld", (long int)uid);
622 if (setgid(gid) < 0 || setuid(uid) < 0)
624 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
625 "(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[NGROUPS_MAX];
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(NGROUPS_MAX, group_list);
639 debug_printf(" auxiliary group list:");
643 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
645 else if (group_count < 0)
646 debug_printf(" <error: %s>", strerror(save_errno));
647 else debug_printf(" <none>");
655 /*************************************************
657 *************************************************/
659 /* Exim exits via this function so that it always clears up any open
665 Returns: does not return
669 exim_exit(int rc, const uschar * process)
673 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
674 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
675 process ? "(" : "", process, process ? ") " : "", rc);
682 /*************************************************
683 * Extract port from host address *
684 *************************************************/
686 /* Called to extract the port from the values given to -oMa and -oMi.
687 It also checks the syntax of the address, and terminates it before the
688 port data when a port is extracted.
691 address the address, with possible port on the end
693 Returns: the port, or zero if there isn't one
694 bombs out on a syntax error
698 check_port(uschar *address)
700 int port = host_address_extract_port(address);
701 if (string_is_ip_address(address, NULL) == 0)
703 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
711 /*************************************************
712 * Test/verify an address *
713 *************************************************/
715 /* This function is called by the -bv and -bt code. It extracts a working
716 address from a full RFC 822 address. This isn't really necessary per se, but it
717 has the effect of collapsing source routes.
721 flags flag bits for verify_address()
722 exit_value to be set for failures
728 test_address(uschar *s, int flags, int *exit_value)
730 int start, end, domain;
731 uschar *parse_error = NULL;
732 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
736 fprintf(stdout, "syntax error: %s\n", parse_error);
741 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
742 -1, -1, NULL, NULL, NULL);
743 if (rc == FAIL) *exit_value = 2;
744 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
750 /*************************************************
751 * Show supported features *
752 *************************************************/
755 show_db_version(FILE * f)
757 #ifdef DB_VERSION_STRING
760 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
761 fprintf(f, " Runtime: %s\n",
762 db_version(NULL, NULL, NULL));
765 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
767 #elif defined(BTREEVERSION) && defined(HASHVERSION)
769 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
771 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
774 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
775 fprintf(f, "Probably ndbm\n");
776 #elif defined(USE_TDB)
777 fprintf(f, "Using tdb\n");
780 fprintf(f, "Probably GDBM (native mode)\n");
782 fprintf(f, "Probably GDBM (compatibility mode)\n");
788 /* This function is called for -bV/--version and for -d to output the optional
789 features of the current Exim binary.
791 Arguments: a FILE for printing
796 show_whats_supported(FILE * fp)
800 DEBUG(D_any) {} else show_db_version(fp);
802 fprintf(fp, "Support for:");
803 #ifdef SUPPORT_CRYPTEQ
804 fprintf(fp, " crypteq");
807 fprintf(fp, " iconv()");
810 fprintf(fp, " IPv6");
812 #ifdef HAVE_SETCLASSRESOURCES
813 fprintf(fp, " use_setclassresources");
819 fprintf(fp, " Perl");
822 fprintf(fp, " Expand_dlfunc");
824 #ifdef USE_TCP_WRAPPERS
825 fprintf(fp, " TCPwrappers");
829 fprintf(fp, " GnuTLS");
831 fprintf(fp, " OpenSSL");
834 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
835 fprintf(fp, " translate_ip_address");
837 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
838 fprintf(fp, " move_frozen_messages");
840 #ifdef WITH_CONTENT_SCAN
841 fprintf(fp, " Content_Scanning");
844 fprintf(fp, " DANE");
847 fprintf(fp, " DKIM");
849 #ifndef DISABLE_DNSSEC
850 fprintf(fp, " DNSSEC");
852 #ifndef DISABLE_EVENT
853 fprintf(fp, " Event");
856 fprintf(fp, " I18N");
859 fprintf(fp, " OCSP");
862 fprintf(fp, " PRDR");
865 fprintf(fp, " PROXY");
868 fprintf(fp, " SOCKS");
875 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
877 #ifdef EXPERIMENTAL_LMDB
878 fprintf(fp, " Experimental_LMDB");
880 #ifdef EXPERIMENTAL_QUEUEFILE
881 fprintf(fp, " Experimental_QUEUEFILE");
883 #ifdef EXPERIMENTAL_SRS
884 fprintf(fp, " Experimental_SRS");
886 #ifdef EXPERIMENTAL_ARC
887 fprintf(fp, " Experimental_ARC");
889 #ifdef EXPERIMENTAL_BRIGHTMAIL
890 fprintf(fp, " Experimental_Brightmail");
892 #ifdef EXPERIMENTAL_DCC
893 fprintf(fp, " Experimental_DCC");
895 #ifdef EXPERIMENTAL_DMARC
896 fprintf(fp, " Experimental_DMARC");
898 #ifdef EXPERIMENTAL_DSN_INFO
899 fprintf(fp, " Experimental_DSN_info");
901 #ifdef EXPERIMENTAL_REQUIRETLS
902 fprintf(fp, " Experimental_REQUIRETLS");
906 fprintf(fp, "Lookups (built-in):");
907 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
908 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
910 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
913 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
914 fprintf(fp, " dbm dbmjz dbmnz");
916 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
917 fprintf(fp, " dnsdb");
919 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
920 fprintf(fp, " dsearch");
922 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
923 fprintf(fp, " ibase");
925 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
926 fprintf(fp, " ldap ldapdn ldapm");
928 #ifdef EXPERIMENTAL_LMDB
929 fprintf(fp, " lmdb");
931 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
932 fprintf(fp, " mysql");
934 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
935 fprintf(fp, " nis nis0");
937 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
938 fprintf(fp, " nisplus");
940 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
941 fprintf(fp, " oracle");
943 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
944 fprintf(fp, " passwd");
946 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
947 fprintf(fp, " pgsql");
949 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
950 fprintf(fp, " redis");
952 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
953 fprintf(fp, " sqlite");
955 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
956 fprintf(fp, " testdb");
958 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
959 fprintf(fp, " whoson");
963 auth_show_supported(fp);
964 route_show_supported(fp);
965 transport_show_supported(fp);
967 #ifdef WITH_CONTENT_SCAN
968 malware_show_supported(fp);
971 if (fixed_never_users[0] > 0)
974 fprintf(fp, "Fixed never_users: ");
975 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
976 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
977 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
980 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
982 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
984 /* Everything else is details which are only worth reporting when debugging.
985 Perhaps the tls_version_report should move into this too. */
990 /* clang defines __GNUC__ (at least, for me) so test for it first */
991 #if defined(__clang__)
992 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
993 #elif defined(__GNUC__)
994 fprintf(fp, "Compiler: GCC [%s]\n",
998 "? unknown version ?"
1002 fprintf(fp, "Compiler: <unknown>\n");
1005 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1006 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1007 __GLIBC__, __GLIBC_MINOR__);
1008 if (__GLIBC_PREREQ(2, 1))
1009 fprintf(fp, " Runtime: %s\n",
1010 gnu_get_libc_version());
1013 show_db_version(fp);
1016 tls_version_report(fp);
1019 utf8_version_report(fp);
1022 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1023 if (authi->version_report)
1024 (*authi->version_report)(fp);
1026 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1027 characters; unless it's an ancient version of PCRE in which case it
1029 #ifndef PCRE_PRERELEASE
1030 # define PCRE_PRERELEASE
1033 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1034 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1036 PCRE_MAJOR, PCRE_MINOR,
1037 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1040 #undef EXPAND_AND_QUOTE
1043 for (i = 0; i < lookup_list_count; i++)
1044 if (lookup_list[i]->version_report)
1045 lookup_list[i]->version_report(fp);
1047 #ifdef WHITELIST_D_MACROS
1048 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1050 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1052 #ifdef TRUSTED_CONFIG_LIST
1053 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1055 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1062 /*************************************************
1063 * Show auxiliary information about Exim *
1064 *************************************************/
1067 show_exim_information(enum commandline_info request, FILE *stream)
1074 fprintf(stream, "Oops, something went wrong.\n");
1078 "The -bI: flag takes a string indicating which information to provide.\n"
1079 "If the string is not recognised, you'll get this help (on stderr).\n"
1081 " exim -bI:help this information\n"
1082 " exim -bI:dscp list of known dscp value keywords\n"
1083 " exim -bI:sieve list of supported sieve extensions\n"
1087 for (pp = exim_sieve_extension_list; *pp; ++pp)
1088 fprintf(stream, "%s\n", *pp);
1091 dscp_list_to_stream(stream);
1097 /*************************************************
1098 * Quote a local part *
1099 *************************************************/
1101 /* This function is used when a sender address or a From: or Sender: header
1102 line is being created from the caller's login, or from an authenticated_id. It
1103 applies appropriate quoting rules for a local part.
1105 Argument: the local part
1106 Returns: the local part, quoted if necessary
1110 local_part_quote(uschar *lpart)
1112 BOOL needs_quote = FALSE;
1116 for (t = lpart; !needs_quote && *t != 0; t++)
1118 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1119 (*t != '.' || t == lpart || t[1] == 0);
1122 if (!needs_quote) return lpart;
1124 g = string_catn(NULL, US"\"", 1);
1128 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1131 g = string_cat(g, lpart);
1134 g = string_catn(g, lpart, nq - lpart);
1135 g = string_catn(g, US"\\", 1);
1136 g = string_catn(g, nq, 1);
1140 g = string_catn(g, US"\"", 1);
1141 return string_from_gstring(g);
1147 /*************************************************
1148 * Load readline() functions *
1149 *************************************************/
1151 /* This function is called from testing executions that read data from stdin,
1152 but only when running as the calling user. Currently, only -be does this. The
1153 function loads the readline() function library and passes back the functions.
1154 On some systems, it needs the curses library, so load that too, but try without
1155 it if loading fails. All this functionality has to be requested at build time.
1158 fn_readline_ptr pointer to where to put the readline pointer
1159 fn_addhist_ptr pointer to where to put the addhistory function
1161 Returns: the dlopen handle or NULL on failure
1165 set_readline(char * (**fn_readline_ptr)(const char *),
1166 void (**fn_addhist_ptr)(const char *))
1169 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1171 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1172 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1174 if (dlhandle != NULL)
1176 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1177 * char * readline (const char *prompt);
1178 * void add_history (const char *string);
1180 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1181 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1185 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1194 /*************************************************
1195 * Get a line from stdin for testing things *
1196 *************************************************/
1198 /* This function is called when running tests that can take a number of lines
1199 of input (for example, -be and -bt). It handles continuations and trailing
1200 spaces. And prompting and a blank line output on eof. If readline() is in use,
1201 the arguments are non-NULL and provide the relevant functions.
1204 fn_readline readline function or NULL
1205 fn_addhist addhist function or NULL
1207 Returns: pointer to dynamic memory, or NULL at end of file
1211 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1216 if (!fn_readline) { printf("> "); fflush(stdout); }
1220 uschar buffer[1024];
1224 char *readline_line = NULL;
1225 if (fn_readline != NULL)
1227 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1228 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1229 p = US readline_line;
1234 /* readline() not in use */
1237 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1241 /* Handle the line */
1243 ss = p + (int)Ustrlen(p);
1244 while (ss > p && isspace(ss[-1])) ss--;
1248 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1251 g = string_catn(g, p, ss - p);
1254 if (fn_readline) free(readline_line);
1257 /* g can only be NULL if ss==p */
1258 if (ss == p || g->s[g->ptr-1] != '\\')
1262 (void) string_from_gstring(g);
1265 if (!g) printf("\n");
1266 return string_from_gstring(g);
1271 /*************************************************
1272 * Output usage information for the program *
1273 *************************************************/
1275 /* This function is called when there are no recipients
1276 or a specific --help argument was added.
1279 progname information on what name we were called by
1281 Returns: DOES NOT RETURN
1285 exim_usage(uschar *progname)
1288 /* Handle specific program invocation variants */
1289 if (Ustrcmp(progname, US"-mailq") == 0)
1292 "mailq - list the contents of the mail queue\n\n"
1293 "For a list of options, see the Exim documentation.\n");
1297 /* Generic usage - we output this whatever happens */
1299 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1300 "not directly from a shell command line. Options and/or arguments control\n"
1301 "what it does when called. For a list of options, see the Exim documentation.\n");
1308 /*************************************************
1309 * Validate that the macros given are okay *
1310 *************************************************/
1312 /* Typically, Exim will drop privileges if macros are supplied. In some
1313 cases, we want to not do so.
1315 Arguments: opt_D_used - true if the commandline had a "-D" option
1316 Returns: true if trusted, false otherwise
1320 macros_trusted(BOOL opt_D_used)
1322 #ifdef WHITELIST_D_MACROS
1324 uschar *whitelisted, *end, *p, **whites, **w;
1325 int white_count, i, n;
1327 BOOL prev_char_item, found;
1332 #ifndef WHITELIST_D_MACROS
1336 /* We only trust -D overrides for some invoking users:
1337 root, the exim run-time user, the optional config owner user.
1338 I don't know why config-owner would be needed, but since they can own the
1339 config files anyway, there's no security risk to letting them override -D. */
1340 if ( ! ((real_uid == root_uid)
1341 || (real_uid == exim_uid)
1342 #ifdef CONFIGURE_OWNER
1343 || (real_uid == config_uid)
1347 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1351 /* Get a list of macros which are whitelisted */
1352 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1353 prev_char_item = FALSE;
1355 for (p = whitelisted; *p != '\0'; ++p)
1357 if (*p == ':' || isspace(*p))
1362 prev_char_item = FALSE;
1365 if (!prev_char_item)
1366 prev_char_item = TRUE;
1373 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1374 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1379 if (i == white_count)
1381 while (*p != '\0' && p < end)
1387 /* The list of commandline macros should be very short.
1388 Accept the N*M complexity. */
1389 for (m = macros_user; m; m = m->next) if (m->command_line)
1392 for (w = whites; *w; ++w)
1393 if (Ustrcmp(*w, m->name) == 0)
1400 if (!m->replacement)
1402 if ((len = m->replen) == 0)
1404 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1405 0, PCRE_EOPT, NULL, 0);
1408 if (n != PCRE_ERROR_NOMATCH)
1409 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1413 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1419 /*************************************************
1420 * Expansion testing *
1421 *************************************************/
1423 /* Expand and print one item, doing macro-processing.
1426 item line for expansion
1430 expansion_test_line(uschar * line)
1435 Ustrncpy(big_buffer, line, big_buffer_size);
1436 big_buffer[big_buffer_size-1] = '\0';
1437 len = Ustrlen(big_buffer);
1439 (void) macros_expand(0, &len, &dummy_macexp);
1441 if (isupper(big_buffer[0]))
1443 if (macro_read_assignment(big_buffer))
1444 printf("Defined macro '%s'\n", mlast->name);
1447 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1448 else printf("Failed: %s\n", expand_string_message);
1452 /*************************************************
1453 * Entry point and high-level code *
1454 *************************************************/
1456 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1457 the appropriate action. All the necessary functions are present in the one
1458 binary. I originally thought one should split it up, but it turns out that so
1459 much of the apparatus is needed in each chunk that one might as well just have
1460 it all available all the time, which then makes the coding easier as well.
1463 argc count of entries in argv
1464 argv argument strings, with argv[0] being the program name
1466 Returns: EXIT_SUCCESS if terminated successfully
1467 EXIT_FAILURE otherwise, except when a message has been sent
1468 to the sender, and -oee was given
1472 main(int argc, char **cargv)
1474 uschar **argv = USS cargv;
1475 int arg_receive_timeout = -1;
1476 int arg_smtp_receive_timeout = -1;
1477 int arg_error_handling = error_handling;
1478 int filter_sfd = -1;
1479 int filter_ufd = -1;
1482 int list_queue_option = 0;
1484 int msg_action_arg = -1;
1485 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1486 int queue_only_reason = 0;
1488 int perl_start_option = 0;
1490 int recipients_arg = argc;
1491 int sender_address_domain = 0;
1492 int test_retry_arg = -1;
1493 int test_rewrite_arg = -1;
1494 BOOL arg_queue_only = FALSE;
1495 BOOL bi_option = FALSE;
1496 BOOL checking = FALSE;
1497 BOOL count_queue = FALSE;
1498 BOOL expansion_test = FALSE;
1499 BOOL extract_recipients = FALSE;
1500 BOOL flag_G = FALSE;
1501 BOOL flag_n = FALSE;
1502 BOOL forced_delivery = FALSE;
1503 BOOL f_end_dot = FALSE;
1504 BOOL deliver_give_up = FALSE;
1505 BOOL list_queue = FALSE;
1506 BOOL list_options = FALSE;
1507 BOOL list_config = FALSE;
1508 BOOL local_queue_only;
1510 BOOL one_msg_action = FALSE;
1511 BOOL opt_D_used = FALSE;
1512 BOOL queue_only_set = FALSE;
1513 BOOL receiving_message = TRUE;
1514 BOOL sender_ident_set = FALSE;
1515 BOOL session_local_queue_only;
1517 BOOL removed_privilege = FALSE;
1518 BOOL usage_wanted = FALSE;
1519 BOOL verify_address_mode = FALSE;
1520 BOOL verify_as_sender = FALSE;
1521 BOOL version_printed = FALSE;
1522 uschar *alias_arg = NULL;
1523 uschar *called_as = US"";
1524 uschar *cmdline_syslog_name = NULL;
1525 uschar *start_queue_run_id = NULL;
1526 uschar *stop_queue_run_id = NULL;
1527 uschar *expansion_test_message = NULL;
1528 uschar *ftest_domain = NULL;
1529 uschar *ftest_localpart = NULL;
1530 uschar *ftest_prefix = NULL;
1531 uschar *ftest_suffix = NULL;
1532 uschar *log_oneline = NULL;
1533 uschar *malware_test_file = NULL;
1534 uschar *real_sender_address;
1535 uschar *originator_home = US"/";
1540 struct stat statbuf;
1541 pid_t passed_qr_pid = (pid_t)0;
1542 int passed_qr_pipe = -1;
1543 gid_t group_list[NGROUPS_MAX];
1545 /* For the -bI: flag */
1546 enum commandline_info info_flag = CMDINFO_NONE;
1547 BOOL info_stdout = FALSE;
1549 /* Possible options for -R and -S */
1551 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1553 /* Need to define this in case we need to change the environment in order
1554 to get rid of a bogus time zone. We have to make it char rather than uschar
1555 because some OS define it in /usr/include/unistd.h. */
1557 extern char **environ;
1559 /* If the Exim user and/or group and/or the configuration file owner/group were
1560 defined by ref:name at build time, we must now find the actual uid/gid values.
1561 This is a feature to make the lives of binary distributors easier. */
1563 #ifdef EXIM_USERNAME
1564 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1568 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1572 /* If ref:name uses a number as the name, route_finduser() returns
1573 TRUE with exim_uid set and pw coerced to NULL. */
1575 exim_gid = pw->pw_gid;
1576 #ifndef EXIM_GROUPNAME
1580 "exim: ref:name should specify a usercode, not a group.\n"
1581 "exim: can't let you get away with it unless you also specify a group.\n");
1588 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1594 #ifdef EXIM_GROUPNAME
1595 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1597 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1603 #ifdef CONFIGURE_OWNERNAME
1604 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1606 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1607 CONFIGURE_OWNERNAME);
1612 /* We default the system_filter_user to be the Exim run-time user, as a
1613 sane non-root value. */
1614 system_filter_uid = exim_uid;
1616 #ifdef CONFIGURE_GROUPNAME
1617 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1619 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1620 CONFIGURE_GROUPNAME);
1625 /* In the Cygwin environment, some initialization used to need doing.
1626 It was fudged in by means of this macro; now no longer but we'll leave
1627 it in case of others. */
1633 /* Check a field which is patched when we are running Exim within its
1634 testing harness; do a fast initial check, and then the whole thing. */
1636 f.running_in_test_harness =
1637 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1638 if (f.running_in_test_harness)
1641 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1642 at the start of a program; however, it seems that some environments do not
1643 follow this. A "strange" locale can affect the formatting of timestamps, so we
1646 setlocale(LC_ALL, "C");
1648 /* Set up the default handler for timing using alarm(). */
1650 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1652 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1653 because store_malloc writes a log entry on failure. */
1655 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1657 fprintf(stderr, "exim: failed to get store for log buffer\n");
1661 /* Initialize the default log options. */
1663 bits_set(log_selector, log_selector_size, log_default);
1665 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1666 NULL when the daemon is run and the file is closed. We have to use this
1667 indirection, because some systems don't allow writing to the variable "stderr".
1670 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1672 /* Arrange for the PCRE regex library to use our store functions. Note that
1673 the normal calls are actually macros that add additional arguments for
1674 debugging purposes so we have to assign specially constructed functions here.
1675 The default is to use store in the stacking pool, but this is overridden in the
1676 regex_must_compile() function. */
1678 pcre_malloc = function_store_get;
1679 pcre_free = function_dummy_free;
1681 /* Ensure there is a big buffer for temporary use in several places. It is put
1682 in malloc store so that it can be freed for enlargement if necessary. */
1684 big_buffer = store_malloc(big_buffer_size);
1686 /* Set up the handler for the data request signal, and set the initial
1687 descriptive text. */
1689 set_process_info("initializing");
1690 os_restarting_signal(SIGUSR1, usr1_handler);
1692 /* If running in a dockerized environment, the TERM signal is only
1693 delegated to the PID 1 if we request it by setting an signal handler */
1694 if (getpid() == 1) signal(SIGTERM, term_handler);
1696 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1697 in the daemon code. For the rest of Exim's uses, we ignore it. */
1699 signal(SIGHUP, SIG_IGN);
1701 /* We don't want to die on pipe errors as the code is written to handle
1702 the write error instead. */
1704 signal(SIGPIPE, SIG_IGN);
1706 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1707 set to SIG_IGN. This causes subprocesses that complete before the parent
1708 process waits for them not to hang around, so when Exim calls wait(), nothing
1709 is there. The wait() code has been made robust against this, but let's ensure
1710 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1711 ending status. We use sigaction rather than plain signal() on those OS where
1712 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1713 problem on AIX with this.) */
1717 struct sigaction act;
1718 act.sa_handler = SIG_DFL;
1719 sigemptyset(&(act.sa_mask));
1721 sigaction(SIGCHLD, &act, NULL);
1724 signal(SIGCHLD, SIG_DFL);
1727 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1732 /* Set up the version number. Set up the leading 'E' for the external form of
1733 message ids, set the pointer to the internal form, and initialize it to
1734 indicate no message being processed. */
1737 message_id_option[0] = '-';
1738 message_id_external = message_id_option + 1;
1739 message_id_external[0] = 'E';
1740 message_id = message_id_external + 1;
1743 /* Set the umask to zero so that any files Exim creates using open() are
1744 created with the modes that it specifies. NOTE: Files created with fopen() have
1745 a problem, which was not recognized till rather late (February 2006). With this
1746 umask, such files will be world writeable. (They are all content scanning files
1747 in the spool directory, which isn't world-accessible, so this is not a
1748 disaster, but it's untidy.) I don't want to change this overall setting,
1749 however, because it will interact badly with the open() calls. Instead, there's
1750 now a function called modefopen() that fiddles with the umask while calling
1755 /* Precompile the regular expression for matching a message id. Keep this in
1756 step with the code that generates ids in the accept.c module. We need to do
1757 this here, because the -M options check their arguments for syntactic validity
1758 using mac_ismsgid, which uses this. */
1761 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1763 /* Precompile the regular expression that is used for matching an SMTP error
1764 code, possibly extended, at the start of an error message. Note that the
1765 terminating whitespace character is included. */
1768 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1771 #ifdef WHITELIST_D_MACROS
1772 /* Precompile the regular expression used to filter the content of macros
1773 given to -D for permissibility. */
1775 regex_whitelisted_macro =
1776 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1779 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1781 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1782 this seems to be a generally accepted convention, since one finds symbolic
1783 links called "mailq" in standard OS configurations. */
1785 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1786 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1789 receiving_message = FALSE;
1790 called_as = US"-mailq";
1793 /* If the program is called as "rmail" treat it as equivalent to
1794 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1795 i.e. preventing a single dot on a line from terminating the message, and
1796 returning with zero return code, even in cases of error (provided an error
1797 message has been sent). */
1799 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1800 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1803 called_as = US"-rmail";
1804 errors_sender_rc = EXIT_SUCCESS;
1807 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1808 this is a smail convention. */
1810 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1811 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1813 smtp_input = smtp_batched_input = TRUE;
1814 called_as = US"-rsmtp";
1817 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1818 this is a smail convention. */
1820 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1821 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1824 receiving_message = FALSE;
1825 called_as = US"-runq";
1828 /* If the program is called as "newaliases" treat it as equivalent to
1829 "exim -bi"; this is a sendmail convention. */
1831 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1832 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1835 receiving_message = FALSE;
1836 called_as = US"-newaliases";
1839 /* Save the original effective uid for a couple of uses later. It should
1840 normally be root, but in some esoteric environments it may not be. */
1842 original_euid = geteuid();
1844 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1845 to be the same as the real ones. This makes a difference only if Exim is setuid
1846 (or setgid) to something other than root, which could be the case in some
1847 special configurations. */
1849 real_uid = getuid();
1850 real_gid = getgid();
1852 if (real_uid == root_uid)
1854 rv = setgid(real_gid);
1857 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1858 (long int)real_gid, strerror(errno));
1861 rv = setuid(real_uid);
1864 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1865 (long int)real_uid, strerror(errno));
1870 /* If neither the original real uid nor the original euid was root, Exim is
1871 running in an unprivileged state. */
1873 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1875 /* Scan the program's arguments. Some can be dealt with right away; others are
1876 simply recorded for checking and handling afterwards. Do a high-level switch
1877 on the second character (the one after '-'), to save some effort. */
1879 for (i = 1; i < argc; i++)
1881 BOOL badarg = FALSE;
1882 uschar *arg = argv[i];
1886 /* An argument not starting with '-' is the start of a recipients list;
1887 break out of the options-scanning loop. */
1895 /* An option consisting of -- terminates the options */
1897 if (Ustrcmp(arg, "--") == 0)
1899 recipients_arg = i + 1;
1903 /* Handle flagged options */
1905 switchchar = arg[1];
1908 /* Make all -ex options synonymous with -oex arguments, since that
1909 is assumed by various callers. Also make -qR options synonymous with -R
1910 options, as that seems to be required as well. Allow for -qqR too, and
1911 the same for -S options. */
1913 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1914 Ustrncmp(arg+1, "qR", 2) == 0 ||
1915 Ustrncmp(arg+1, "qS", 2) == 0)
1917 switchchar = arg[2];
1920 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1922 switchchar = arg[3];
1924 f.queue_2stage = TRUE;
1927 /* Make -r synonymous with -f, since it is a documented alias */
1929 else if (arg[1] == 'r') switchchar = 'f';
1931 /* Make -ov synonymous with -v */
1933 else if (Ustrcmp(arg, "-ov") == 0)
1939 /* deal with --option_aliases */
1940 else if (switchchar == '-')
1942 if (Ustrcmp(argrest, "help") == 0)
1944 usage_wanted = TRUE;
1947 else if (Ustrcmp(argrest, "version") == 0)
1954 /* High-level switch on active initial letter */
1959 /* sendmail uses -Ac and -Am to control which .cf file is used;
1962 if (*argrest == '\0') { badarg = TRUE; break; }
1965 BOOL ignore = FALSE;
1970 if (*(argrest + 1) == '\0')
1974 if (!ignore) { badarg = TRUE; break; }
1978 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1979 so has no need of it. */
1982 if (*argrest == 0) i++; /* Skip over the type */
1987 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1989 /* -bd: Run in daemon mode, awaiting SMTP connections.
1990 -bdf: Ditto, but in the foreground.
1993 if (*argrest == 'd')
1995 f.daemon_listen = TRUE;
1996 if (*(++argrest) == 'f') f.background_daemon = FALSE;
1997 else if (*argrest != 0) { badarg = TRUE; break; }
2000 /* -be: Run in expansion test mode
2001 -bem: Ditto, but read a message from a file first
2004 else if (*argrest == 'e')
2006 expansion_test = checking = TRUE;
2007 if (argrest[1] == 'm')
2009 if (++i >= argc) { badarg = TRUE; break; }
2010 expansion_test_message = argv[i];
2013 if (argrest[1] != 0) { badarg = TRUE; break; }
2016 /* -bF: Run system filter test */
2018 else if (*argrest == 'F')
2020 filter_test |= checking = FTEST_SYSTEM;
2021 if (*(++argrest) != 0) { badarg = TRUE; break; }
2022 if (++i < argc) filter_test_sfile = argv[i]; else
2024 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2029 /* -bf: Run user filter test
2030 -bfd: Set domain for filter testing
2031 -bfl: Set local part for filter testing
2032 -bfp: Set prefix for filter testing
2033 -bfs: Set suffix for filter testing
2036 else if (*argrest == 'f')
2038 if (*(++argrest) == 0)
2040 filter_test |= checking = FTEST_USER;
2041 if (++i < argc) filter_test_ufile = argv[i]; else
2043 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2051 fprintf(stderr, "exim: string expected after %s\n", arg);
2054 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2055 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2056 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2057 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2058 else { badarg = TRUE; break; }
2062 /* -bh: Host checking - an IP address must follow. */
2064 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2066 if (++i >= argc) { badarg = TRUE; break; }
2067 sender_host_address = argv[i];
2068 host_checking = checking = f.log_testing_mode = TRUE;
2069 f.host_checking_callout = argrest[1] == 'c';
2070 message_logs = FALSE;
2073 /* -bi: This option is used by sendmail to initialize *the* alias file,
2074 though it has the -oA option to specify a different file. Exim has no
2075 concept of *the* alias file, but since Sun's YP make script calls
2076 sendmail this way, some support must be provided. */
2078 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2080 /* -bI: provide information, of the type to follow after a colon.
2081 This is an Exim flag. */
2083 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2085 uschar *p = &argrest[2];
2086 info_flag = CMDINFO_HELP;
2089 if (strcmpic(p, CUS"sieve") == 0)
2091 info_flag = CMDINFO_SIEVE;
2094 else if (strcmpic(p, CUS"dscp") == 0)
2096 info_flag = CMDINFO_DSCP;
2099 else if (strcmpic(p, CUS"help") == 0)
2106 /* -bm: Accept and deliver message - the default option. Reinstate
2107 receiving_message, which got turned off for all -b options. */
2109 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2111 /* -bmalware: test the filename given for malware */
2113 else if (Ustrcmp(argrest, "malware") == 0)
2115 if (++i >= argc) { badarg = TRUE; break; }
2117 malware_test_file = argv[i];
2120 /* -bnq: For locally originating messages, do not qualify unqualified
2121 addresses. In the envelope, this causes errors; in header lines they
2124 else if (Ustrcmp(argrest, "nq") == 0)
2126 f.allow_unqualified_sender = FALSE;
2127 f.allow_unqualified_recipient = FALSE;
2130 /* -bpxx: List the contents of the mail queue, in various forms. If
2131 the option is -bpc, just a queue count is needed. Otherwise, if the
2132 first letter after p is r, then order is random. */
2134 else if (*argrest == 'p')
2136 if (*(++argrest) == 'c')
2139 if (*(++argrest) != 0) badarg = TRUE;
2143 if (*argrest == 'r')
2145 list_queue_option = 8;
2148 else list_queue_option = 0;
2152 /* -bp: List the contents of the mail queue, top-level only */
2154 if (*argrest == 0) {}
2156 /* -bpu: List the contents of the mail queue, top-level undelivered */
2158 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2160 /* -bpa: List the contents of the mail queue, including all delivered */
2162 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2164 /* Unknown after -bp[r] */
2174 /* -bP: List the configuration variables given as the address list.
2175 Force -v, so configuration errors get displayed. */
2177 else if (Ustrcmp(argrest, "P") == 0)
2179 /* -bP config: we need to setup here, because later,
2180 * when list_options is checked, the config is read already */
2181 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2184 readconf_save_config(version_string);
2188 list_options = TRUE;
2189 debug_selector |= D_v;
2190 debug_file = stderr;
2194 /* -brt: Test retry configuration lookup */
2196 else if (Ustrcmp(argrest, "rt") == 0)
2199 test_retry_arg = i + 1;
2203 /* -brw: Test rewrite configuration */
2205 else if (Ustrcmp(argrest, "rw") == 0)
2208 test_rewrite_arg = i + 1;
2212 /* -bS: Read SMTP commands on standard input, but produce no replies -
2213 all errors are reported by sending messages. */
2215 else if (Ustrcmp(argrest, "S") == 0)
2216 smtp_input = smtp_batched_input = receiving_message = TRUE;
2218 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2219 on standard output. */
2221 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2223 /* -bt: address testing mode */
2225 else if (Ustrcmp(argrest, "t") == 0)
2226 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2228 /* -bv: verify addresses */
2230 else if (Ustrcmp(argrest, "v") == 0)
2231 verify_address_mode = checking = f.log_testing_mode = TRUE;
2233 /* -bvs: verify sender addresses */
2235 else if (Ustrcmp(argrest, "vs") == 0)
2237 verify_address_mode = checking = f.log_testing_mode = TRUE;
2238 verify_as_sender = TRUE;
2241 /* -bV: Print version string and support details */
2243 else if (Ustrcmp(argrest, "V") == 0)
2245 printf("Exim version %s #%s built %s\n", version_string,
2246 version_cnumber, version_date);
2247 printf("%s\n", CS version_copyright);
2248 version_printed = TRUE;
2249 show_whats_supported(stdout);
2250 f.log_testing_mode = TRUE;
2253 /* -bw: inetd wait mode, accept a listening socket as stdin */
2255 else if (*argrest == 'w')
2257 f.inetd_wait_mode = TRUE;
2258 f.background_daemon = FALSE;
2259 f.daemon_listen = TRUE;
2260 if (*(++argrest) != '\0')
2262 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2263 if (inetd_wait_timeout <= 0)
2265 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2275 /* -C: change configuration file list; ignore if it isn't really
2276 a change! Enforce a prefix check if required. */
2281 if(++i < argc) argrest = argv[i]; else
2282 { badarg = TRUE; break; }
2284 if (Ustrcmp(config_main_filelist, argrest) != 0)
2286 #ifdef ALT_CONFIG_PREFIX
2288 int len = Ustrlen(ALT_CONFIG_PREFIX);
2289 const uschar *list = argrest;
2291 while((filename = string_nextinlist(&list, &sep, big_buffer,
2292 big_buffer_size)) != NULL)
2294 if ((Ustrlen(filename) < len ||
2295 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2296 Ustrstr(filename, "/../") != NULL) &&
2297 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2299 fprintf(stderr, "-C Permission denied\n");
2304 if (real_uid != root_uid)
2306 #ifdef TRUSTED_CONFIG_LIST
2308 if (real_uid != exim_uid
2309 #ifdef CONFIGURE_OWNER
2310 && real_uid != config_uid
2313 f.trusted_config = FALSE;
2316 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2319 struct stat statbuf;
2321 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2322 (statbuf.st_uid != root_uid /* owner not root */
2323 #ifdef CONFIGURE_OWNER
2324 && statbuf.st_uid != config_uid /* owner not the special one */
2327 (statbuf.st_gid != root_gid /* group not root */
2328 #ifdef CONFIGURE_GROUP
2329 && statbuf.st_gid != config_gid /* group not the special one */
2331 && (statbuf.st_mode & 020) != 0 /* group writeable */
2333 (statbuf.st_mode & 2) != 0) /* world writeable */
2335 f.trusted_config = FALSE;
2340 /* Well, the trust list at least is up to scratch... */
2341 void *reset_point = store_get(0);
2342 uschar *trusted_configs[32];
2346 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2348 uschar *start = big_buffer, *nl;
2349 while (*start && isspace(*start))
2353 nl = Ustrchr(start, '\n');
2356 trusted_configs[nr_configs++] = string_copy(start);
2357 if (nr_configs == 32)
2365 const uschar *list = argrest;
2367 while (f.trusted_config && (filename = string_nextinlist(&list,
2368 &sep, big_buffer, big_buffer_size)) != NULL)
2370 for (i=0; i < nr_configs; i++)
2372 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2375 if (i == nr_configs)
2377 f.trusted_config = FALSE;
2381 store_reset(reset_point);
2385 /* No valid prefixes found in trust_list file. */
2386 f.trusted_config = FALSE;
2392 /* Could not open trust_list file. */
2393 f.trusted_config = FALSE;
2397 /* Not root; don't trust config */
2398 f.trusted_config = FALSE;
2402 config_main_filelist = argrest;
2403 f.config_changed = TRUE;
2408 /* -D: set up a macro definition */
2411 #ifdef DISABLE_D_OPTION
2412 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2419 uschar *s = argrest;
2422 while (isspace(*s)) s++;
2424 if (*s < 'A' || *s > 'Z')
2426 fprintf(stderr, "exim: macro name set by -D must start with "
2427 "an upper case letter\n");
2431 while (isalnum(*s) || *s == '_')
2433 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2437 if (ptr == 0) { badarg = TRUE; break; }
2438 while (isspace(*s)) s++;
2441 if (*s++ != '=') { badarg = TRUE; break; }
2442 while (isspace(*s)) s++;
2445 for (m = macros_user; m; m = m->next)
2446 if (Ustrcmp(m->name, name) == 0)
2448 fprintf(stderr, "exim: duplicated -D in command line\n");
2452 m = macro_create(name, s, TRUE);
2454 if (clmacro_count >= MAX_CLMACROS)
2456 fprintf(stderr, "exim: too many -D options on command line\n");
2459 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2465 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2466 The latter is now a no-op, retained for compatibility only. If -dd is used,
2467 debugging subprocesses of the daemon is disabled. */
2470 if (Ustrcmp(argrest, "ropcr") == 0)
2472 /* drop_cr = TRUE; */
2475 /* Use an intermediate variable so that we don't set debugging while
2476 decoding the debugging bits. */
2480 unsigned int selector = D_default;
2483 if (*argrest == 'd')
2485 f.debug_daemon = TRUE;
2489 decode_bits(&selector, 1, debug_notall, argrest,
2490 debug_options, debug_options_count, US"debug", 0);
2491 debug_selector = selector;
2496 /* -E: This is a local error message. This option is not intended for
2497 external use at all, but is not restricted to trusted callers because it
2498 does no harm (just suppresses certain error messages) and if Exim is run
2499 not setuid root it won't always be trusted when it generates error
2500 messages using this option. If there is a message id following -E, point
2501 message_reference at it, for logging. */
2504 f.local_error_message = TRUE;
2505 if (mac_ismsgid(argrest)) message_reference = argrest;
2509 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2510 option, so it looks as if historically the -oex options are also callable
2511 without the leading -o. So we have to accept them. Before the switch,
2512 anything starting -oe has been converted to -e. Exim does not support all
2513 of the sendmail error options. */
2516 if (Ustrcmp(argrest, "e") == 0)
2518 arg_error_handling = ERRORS_SENDER;
2519 errors_sender_rc = EXIT_SUCCESS;
2521 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2522 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2523 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2524 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2529 /* -F: Set sender's full name, used instead of the gecos entry from
2530 the password file. Since users can usually alter their gecos entries,
2531 there's no security involved in using this instead. The data can follow
2532 the -F or be in the next argument. */
2537 if(++i < argc) argrest = argv[i]; else
2538 { badarg = TRUE; break; }
2540 originator_name = argrest;
2541 f.sender_name_forced = TRUE;
2545 /* -f: Set sender's address - this value is only actually used if Exim is
2546 run by a trusted user, or if untrusted_set_sender is set and matches the
2547 address, except that the null address can always be set by any user. The
2548 test for this happens later, when the value given here is ignored when not
2549 permitted. For an untrusted user, the actual sender is still put in Sender:
2550 if it doesn't match the From: header (unless no_local_from_check is set).
2551 The data can follow the -f or be in the next argument. The -r switch is an
2552 obsolete form of -f but since there appear to be programs out there that
2553 use anything that sendmail has ever supported, better accept it - the
2554 synonymizing is done before the switch above.
2556 At this stage, we must allow domain literal addresses, because we don't
2557 know what the setting of allow_domain_literals is yet. Ditto for trailing
2558 dots and strip_trailing_dot. */
2562 int dummy_start, dummy_end;
2566 if (i+1 < argc) argrest = argv[++i]; else
2567 { badarg = TRUE; break; }
2570 sender_address = string_sprintf(""); /* Ensure writeable memory */
2573 uschar *temp = argrest + Ustrlen(argrest) - 1;
2574 while (temp >= argrest && isspace(*temp)) temp--;
2575 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2576 allow_domain_literals = TRUE;
2577 strip_trailing_dot = TRUE;
2579 allow_utf8_domains = TRUE;
2581 sender_address = parse_extract_address(argrest, &errmess,
2582 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2584 message_smtputf8 = string_is_utf8(sender_address);
2585 allow_utf8_domains = FALSE;
2587 allow_domain_literals = FALSE;
2588 strip_trailing_dot = FALSE;
2589 if (sender_address == NULL)
2591 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2592 return EXIT_FAILURE;
2595 f.sender_address_forced = TRUE;
2599 /* -G: sendmail invocation to specify that it's a gateway submission and
2600 sendmail may complain about problems instead of fixing them.
2601 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2602 not at this time complain about problems. */
2608 /* -h: Set the hop count for an incoming message. Exim does not currently
2609 support this; it always computes it by counting the Received: headers.
2610 To put it in will require a change to the spool header file format. */
2615 if(++i < argc) argrest = argv[i]; else
2616 { badarg = TRUE; break; }
2618 if (!isdigit(*argrest)) badarg = TRUE;
2622 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2623 not to be documented for sendmail but mailx (at least) uses it) */
2626 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2630 /* -L: set the identifier used for syslog; equivalent to setting
2631 syslog_processname in the config file, but needs to be an admin option. */
2634 if (*argrest == '\0')
2636 if(++i < argc) argrest = argv[i]; else
2637 { badarg = TRUE; break; }
2639 sz = Ustrlen(argrest);
2642 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2643 return EXIT_FAILURE;
2647 fprintf(stderr, "exim: the -L syslog name is too short\n");
2648 return EXIT_FAILURE;
2650 cmdline_syslog_name = argrest;
2654 receiving_message = FALSE;
2656 /* -MC: continue delivery of another message via an existing open
2657 file descriptor. This option is used for an internal call by the
2658 smtp transport when there is a pending message waiting to go to an
2659 address to which it has got a connection. Five subsequent arguments are
2660 required: transport name, host name, IP address, sequence number, and
2661 message_id. Transports may decline to create new processes if the sequence
2662 number gets too big. The channel is stdin. This (-MC) must be the last
2663 argument. There's a subsequent check that the real-uid is privileged.
2665 If we are running in the test harness. delay for a bit, to let the process
2666 that set this one up complete. This makes for repeatability of the logging,
2669 if (Ustrcmp(argrest, "C") == 0)
2671 union sockaddr_46 interface_sock;
2672 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2676 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2677 return EXIT_FAILURE;
2680 if (msg_action_arg >= 0)
2682 fprintf(stderr, "exim: incompatible arguments\n");
2683 return EXIT_FAILURE;
2686 continue_transport = argv[++i];
2687 continue_hostname = argv[++i];
2688 continue_host_address = argv[++i];
2689 continue_sequence = Uatoi(argv[++i]);
2690 msg_action = MSG_DELIVER;
2691 msg_action_arg = ++i;
2692 forced_delivery = TRUE;
2693 queue_run_pid = passed_qr_pid;
2694 queue_run_pipe = passed_qr_pipe;
2696 if (!mac_ismsgid(argv[i]))
2698 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2700 return EXIT_FAILURE;
2703 /* Set up $sending_ip_address and $sending_port, unless proxied */
2705 if (!continue_proxy_cipher)
2706 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2708 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2712 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2714 return EXIT_FAILURE;
2717 if (f.running_in_test_harness) millisleep(500);
2721 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2725 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2726 precedes -MC (see above). The flag indicates that the host to which
2727 Exim is connected has accepted an AUTH sequence. */
2729 case 'A': f.smtp_authenticated = TRUE; break;
2731 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2732 that exim is connected to supports the esmtp extension DSN */
2734 case 'D': smtp_peer_options |= OPTION_DSN; break;
2736 /* -MCG: set the queue name, to a non-default value */
2738 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2742 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2744 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2746 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2747 it preceded -MC (see above) */
2749 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2751 /* -MCQ: pass on the pid of the queue-running process that started
2752 this chain of deliveries and the fd of its synchronizing pipe; this
2753 is useful only when it precedes -MC (see above) */
2755 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2757 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2761 /* -MCS: set the smtp_use_size flag; this is useful only when it
2762 precedes -MC (see above) */
2764 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2767 /* -MCt: similar to -MCT below but the connection is still open
2768 via a proxy proces which handles the TLS context and coding.
2769 Require three arguments for the proxied local address and port,
2770 and the TLS cipher. */
2772 case 't': if (++i < argc) sending_ip_address = argv[i];
2774 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2776 if (++i < argc) continue_proxy_cipher = argv[i];
2780 /* -MCT: set the tls_offered flag; this is useful only when it
2781 precedes -MC (see above). The flag indicates that the host to which
2782 Exim is connected has offered TLS support. */
2784 case 'T': smtp_peer_options |= OPTION_TLS; break;
2787 default: badarg = TRUE; break;
2792 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2793 /* -MS set REQUIRETLS on (new) message */
2795 else if (*argrest == 'S')
2797 tls_requiretls |= REQUIRETLS_MSG;
2802 /* -M[x]: various operations on the following list of message ids:
2803 -M deliver the messages, ignoring next retry times and thawing
2804 -Mc deliver the messages, checking next retry times, no thawing
2805 -Mf freeze the messages
2806 -Mg give up on the messages
2807 -Mt thaw the messages
2808 -Mrm remove the messages
2809 In the above cases, this must be the last option. There are also the
2810 following options which are followed by a single message id, and which
2811 act on that message. Some of them use the "recipient" addresses as well.
2812 -Mar add recipient(s)
2813 -Mmad mark all recipients delivered
2814 -Mmd mark recipients(s) delivered
2816 -Mset load a message for use with -be
2818 -Mvc show copy (of whole message, in RFC 2822 format)
2823 else if (*argrest == 0)
2825 msg_action = MSG_DELIVER;
2826 forced_delivery = f.deliver_force_thaw = TRUE;
2828 else if (Ustrcmp(argrest, "ar") == 0)
2830 msg_action = MSG_ADD_RECIPIENT;
2831 one_msg_action = TRUE;
2833 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2834 else if (Ustrcmp(argrest, "es") == 0)
2836 msg_action = MSG_EDIT_SENDER;
2837 one_msg_action = TRUE;
2839 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2840 else if (Ustrcmp(argrest, "g") == 0)
2842 msg_action = MSG_DELIVER;
2843 deliver_give_up = TRUE;
2845 else if (Ustrcmp(argrest, "mad") == 0)
2847 msg_action = MSG_MARK_ALL_DELIVERED;
2849 else if (Ustrcmp(argrest, "md") == 0)
2851 msg_action = MSG_MARK_DELIVERED;
2852 one_msg_action = TRUE;
2854 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2855 else if (Ustrcmp(argrest, "set") == 0)
2857 msg_action = MSG_LOAD;
2858 one_msg_action = TRUE;
2860 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2861 else if (Ustrcmp(argrest, "vb") == 0)
2863 msg_action = MSG_SHOW_BODY;
2864 one_msg_action = TRUE;
2866 else if (Ustrcmp(argrest, "vc") == 0)
2868 msg_action = MSG_SHOW_COPY;
2869 one_msg_action = TRUE;
2871 else if (Ustrcmp(argrest, "vh") == 0)
2873 msg_action = MSG_SHOW_HEADER;
2874 one_msg_action = TRUE;
2876 else if (Ustrcmp(argrest, "vl") == 0)
2878 msg_action = MSG_SHOW_LOG;
2879 one_msg_action = TRUE;
2881 else { badarg = TRUE; break; }
2883 /* All the -Mxx options require at least one message id. */
2885 msg_action_arg = i + 1;
2886 if (msg_action_arg >= argc)
2888 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2889 return EXIT_FAILURE;
2892 /* Some require only message ids to follow */
2894 if (!one_msg_action)
2897 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2899 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2901 return EXIT_FAILURE;
2903 goto END_ARG; /* Remaining args are ids */
2906 /* Others require only one message id, possibly followed by addresses,
2907 which will be handled as normal arguments. */
2911 if (!mac_ismsgid(argv[msg_action_arg]))
2913 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2914 argv[msg_action_arg], arg);
2915 return EXIT_FAILURE;
2922 /* Some programs seem to call the -om option without the leading o;
2923 for sendmail it askes for "me too". Exim always does this. */
2926 if (*argrest != 0) badarg = TRUE;
2930 /* -N: don't do delivery - a debugging option that stops transports doing
2931 their thing. It implies debugging at the D_v level. */
2936 f.dont_deliver = TRUE;
2937 debug_selector |= D_v;
2938 debug_file = stderr;
2944 /* -n: This means "don't alias" in sendmail, apparently.
2945 For normal invocations, it has no effect.
2946 It may affect some other options. */
2952 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2953 option to the specified value. This form uses long names. We need to handle
2954 -O option=value and -Ooption=value. */
2961 fprintf(stderr, "exim: string expected after -O\n");
2969 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2972 if (*argrest == 'A')
2974 alias_arg = argrest + 1;
2975 if (alias_arg[0] == 0)
2977 if (i+1 < argc) alias_arg = argv[++i]; else
2979 fprintf(stderr, "exim: string expected after -oA\n");
2985 /* -oB: Set a connection message max value for remote deliveries */
2987 else if (*argrest == 'B')
2989 uschar *p = argrest + 1;
2992 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2994 connection_max_messages = 1;
3003 fprintf(stderr, "exim: number expected after -oB\n");
3006 connection_max_messages = Uatoi(p);
3010 /* -odb: background delivery */
3012 else if (Ustrcmp(argrest, "db") == 0)
3014 f.synchronous_delivery = FALSE;
3015 arg_queue_only = FALSE;
3016 queue_only_set = TRUE;
3019 /* -odf: foreground delivery (smail-compatible option); same effect as
3020 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3023 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3025 f.synchronous_delivery = TRUE;
3026 arg_queue_only = FALSE;
3027 queue_only_set = TRUE;
3030 /* -odq: queue only */
3032 else if (Ustrcmp(argrest, "dq") == 0)
3034 f.synchronous_delivery = FALSE;
3035 arg_queue_only = TRUE;
3036 queue_only_set = TRUE;
3039 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3040 but no remote delivery */
3042 else if (Ustrcmp(argrest, "dqs") == 0)
3044 f.queue_smtp = TRUE;
3045 arg_queue_only = FALSE;
3046 queue_only_set = TRUE;
3049 /* -oex: Sendmail error flags. As these are also accepted without the
3050 leading -o prefix, for compatibility with vacation and other callers,
3051 they are handled with -e above. */
3053 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3054 -oitrue: Another sendmail syntax for the same */
3056 else if (Ustrcmp(argrest, "i") == 0 ||
3057 Ustrcmp(argrest, "itrue") == 0)
3060 /* -oM*: Set various characteristics for an incoming message; actually
3061 acted on for trusted callers only. */
3063 else if (*argrest == 'M')
3067 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3071 /* -oMa: Set sender host address */
3073 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3075 /* -oMaa: Set authenticator name */
3077 else if (Ustrcmp(argrest, "Maa") == 0)
3078 sender_host_authenticated = argv[++i];
3080 /* -oMas: setting authenticated sender */
3082 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3084 /* -oMai: setting authenticated id */
3086 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3088 /* -oMi: Set incoming interface address */
3090 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3092 /* -oMm: Message reference */
3094 else if (Ustrcmp(argrest, "Mm") == 0)
3096 if (!mac_ismsgid(argv[i+1]))
3098 fprintf(stderr,"-oMm must be a valid message ID\n");
3101 if (!f.trusted_config)
3103 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3106 message_reference = argv[++i];
3109 /* -oMr: Received protocol */
3111 else if (Ustrcmp(argrest, "Mr") == 0)
3113 if (received_protocol)
3115 fprintf(stderr, "received_protocol is set already\n");
3118 else received_protocol = argv[++i];
3120 /* -oMs: Set sender host name */
3122 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3124 /* -oMt: Set sender ident */
3126 else if (Ustrcmp(argrest, "Mt") == 0)
3128 sender_ident_set = TRUE;
3129 sender_ident = argv[++i];
3132 /* Else a bad argument */
3141 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3142 seem to call this as -m (undocumented), so that is also accepted (see
3145 else if (Ustrcmp(argrest, "m") == 0) {}
3147 /* -oo: An ancient flag for old-style addresses which still seems to
3148 crop up in some calls (see in SCO). */
3150 else if (Ustrcmp(argrest, "o") == 0) {}
3152 /* -oP <name>: set pid file path for daemon */
3154 else if (Ustrcmp(argrest, "P") == 0)
3155 override_pid_file_path = argv[++i];
3157 /* -or <n>: set timeout for non-SMTP acceptance
3158 -os <n>: set timeout for SMTP acceptance */
3160 else if (*argrest == 'r' || *argrest == 's')
3162 int *tp = (*argrest == 'r')?
3163 &arg_receive_timeout : &arg_smtp_receive_timeout;
3164 if (argrest[1] == 0)
3166 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3168 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3171 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3176 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3178 else if (Ustrcmp(argrest, "X") == 0)
3179 override_local_interfaces = argv[++i];
3181 /* Unknown -o argument */
3187 /* -ps: force Perl startup; -pd force delayed Perl startup */
3191 if (*argrest == 's' && argrest[1] == 0)
3193 perl_start_option = 1;
3196 if (*argrest == 'd' && argrest[1] == 0)
3198 perl_start_option = -1;
3203 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3204 which sets the host protocol and host name */
3208 argrest = argv[++i];
3210 { badarg = TRUE; break; }
3216 if (received_protocol)
3218 fprintf(stderr, "received_protocol is set already\n");
3222 hn = Ustrchr(argrest, ':');
3224 received_protocol = argrest;
3227 int old_pool = store_pool;
3228 store_pool = POOL_PERM;
3229 received_protocol = string_copyn(argrest, hn - argrest);
3230 store_pool = old_pool;
3231 sender_host_name = hn + 1;
3238 receiving_message = FALSE;
3239 if (queue_interval >= 0)
3241 fprintf(stderr, "exim: -q specified more than once\n");
3245 /* -qq...: Do queue runs in a 2-stage manner */
3247 if (*argrest == 'q')
3249 f.queue_2stage = TRUE;
3253 /* -qi...: Do only first (initial) deliveries */
3255 if (*argrest == 'i')
3257 f.queue_run_first_delivery = TRUE;
3261 /* -qf...: Run the queue, forcing deliveries
3262 -qff..: Ditto, forcing thawing as well */
3264 if (*argrest == 'f')
3266 f.queue_run_force = TRUE;
3267 if (*++argrest == 'f')
3269 f.deliver_force_thaw = TRUE;
3274 /* -q[f][f]l...: Run the queue only on local deliveries */
3276 if (*argrest == 'l')
3278 f.queue_run_local = TRUE;
3282 /* -q[f][f][l][G<name>]... Work on the named queue */
3284 if (*argrest == 'G')
3287 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3288 queue_name = string_copyn(argrest, i);
3290 if (*argrest == '/') argrest++;
3293 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3294 only, optionally named, optionally starting from a given message id. */
3296 if (*argrest == 0 &&
3297 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3300 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3301 start_queue_run_id = argv[++i];
3302 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3303 stop_queue_run_id = argv[++i];
3306 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3307 forced, optionally local only, optionally named. */
3309 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3312 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3318 case 'R': /* Synonymous with -qR... */
3319 receiving_message = FALSE;
3321 /* -Rf: As -R (below) but force all deliveries,
3322 -Rff: Ditto, but also thaw all frozen messages,
3323 -Rr: String is regex
3324 -Rrf: Regex and force
3325 -Rrff: Regex and force and thaw
3327 in all cases provided there are no further characters in this
3333 for (i = 0; i < nelem(rsopts); i++)
3334 if (Ustrcmp(argrest, rsopts[i]) == 0)
3336 if (i != 2) f.queue_run_force = TRUE;
3337 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3338 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3339 argrest += Ustrlen(rsopts[i]);
3343 /* -R: Set string to match in addresses for forced queue run to
3344 pick out particular messages. */
3347 deliver_selectstring = argrest;
3348 else if (i+1 < argc)
3349 deliver_selectstring = argv[++i];
3352 fprintf(stderr, "exim: string expected after -R\n");
3358 /* -r: an obsolete synonym for -f (see above) */
3361 /* -S: Like -R but works on sender. */
3363 case 'S': /* Synonymous with -qS... */
3364 receiving_message = FALSE;
3366 /* -Sf: As -S (below) but force all deliveries,
3367 -Sff: Ditto, but also thaw all frozen messages,
3368 -Sr: String is regex
3369 -Srf: Regex and force
3370 -Srff: Regex and force and thaw
3372 in all cases provided there are no further characters in this
3378 for (i = 0; i < nelem(rsopts); i++)
3379 if (Ustrcmp(argrest, rsopts[i]) == 0)
3381 if (i != 2) f.queue_run_force = TRUE;
3382 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3383 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3384 argrest += Ustrlen(rsopts[i]);
3388 /* -S: Set string to match in addresses for forced queue run to
3389 pick out particular messages. */
3392 deliver_selectstring_sender = argrest;
3393 else if (i+1 < argc)
3394 deliver_selectstring_sender = argv[++i];
3397 fprintf(stderr, "exim: string expected after -S\n");
3402 /* -Tqt is an option that is exclusively for use by the testing suite.
3403 It is not recognized in other circumstances. It allows for the setting up
3404 of explicit "queue times" so that various warning/retry things can be
3405 tested. Otherwise variability of clock ticks etc. cause problems. */
3408 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3409 fudged_queue_times = argv[++i];
3414 /* -t: Set flag to extract recipients from body of message. */
3417 if (*argrest == 0) extract_recipients = TRUE;
3419 /* -ti: Set flag to extract recipients from body of message, and also
3420 specify that dot does not end the message. */
3422 else if (Ustrcmp(argrest, "i") == 0)
3424 extract_recipients = TRUE;
3428 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3431 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3438 /* -U: This means "initial user submission" in sendmail, apparently. The
3439 doc claims that in future sendmail may refuse syntactically invalid
3440 messages instead of fixing them. For the moment, we just ignore it. */
3446 /* -v: verify things - this is a very low-level debugging */
3451 debug_selector |= D_v;
3452 debug_file = stderr;
3458 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3460 The -x flag tells the sendmail command that mail from a local
3461 mail program has National Language Support (NLS) extended characters
3462 in the body of the mail item. The sendmail command can send mail with
3463 extended NLS characters across networks that normally corrupts these
3466 As Exim is 8-bit clean, it just ignores this flag. */
3469 if (*argrest != 0) badarg = TRUE;
3472 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3473 logs to that file. We swallow the parameter and otherwise ignore it. */
3476 if (*argrest == '\0')
3479 fprintf(stderr, "exim: string expected after -X\n");
3485 if (*argrest == '\0')
3486 if (++i < argc) log_oneline = argv[i]; else
3488 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3493 /* All other initial characters are errors */
3498 } /* End of high-level switch statement */
3500 /* Failed to recognize the option, or syntax error */
3504 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3505 "option %s\n", arg);
3511 /* If -R or -S have been specified without -q, assume a single queue run. */
3513 if ( (deliver_selectstring || deliver_selectstring_sender)
3514 && queue_interval < 0)
3519 /* If usage_wanted is set we call the usage function - which never returns */
3520 if (usage_wanted) exim_usage(called_as);
3522 /* Arguments have been processed. Check for incompatibilities. */
3524 (smtp_input || extract_recipients || recipients_arg < argc) &&
3525 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3526 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3527 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3530 msg_action_arg > 0 &&
3531 (f.daemon_listen || queue_interval > 0 || list_options ||
3532 (checking && msg_action != MSG_LOAD) ||
3533 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3536 (f.daemon_listen || queue_interval > 0) &&
3537 (sender_address != NULL || list_options || list_queue || checking ||
3541 f.daemon_listen && queue_interval == 0
3544 f.inetd_wait_mode && queue_interval >= 0
3548 (checking || smtp_input || extract_recipients ||
3549 filter_test != FTEST_NONE || bi_option)
3552 verify_address_mode &&
3553 (f.address_test_mode || smtp_input || extract_recipients ||
3554 filter_test != FTEST_NONE || bi_option)
3557 f.address_test_mode && (smtp_input || extract_recipients ||
3558 filter_test != FTEST_NONE || bi_option)
3561 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3565 deliver_selectstring != NULL && queue_interval < 0
3568 msg_action == MSG_LOAD &&
3569 (!expansion_test || expansion_test_message != NULL)
3573 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3577 /* If debugging is set up, set the file and the file descriptor to pass on to
3578 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3579 to run in the foreground. */
3581 if (debug_selector != 0)
3583 debug_file = stderr;
3584 debug_fd = fileno(debug_file);
3585 f.background_daemon = FALSE;
3586 if (f.running_in_test_harness) millisleep(100); /* lets caller finish */
3587 if (debug_selector != D_v) /* -v only doesn't show this */
3589 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3590 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3592 if (!version_printed)
3593 show_whats_supported(stderr);
3597 /* When started with root privilege, ensure that the limits on the number of
3598 open files and the number of processes (where that is accessible) are
3599 sufficiently large, or are unset, in case Exim has been called from an
3600 environment where the limits are screwed down. Not all OS have the ability to
3601 change some of these limits. */
3605 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3611 #ifdef RLIMIT_NOFILE
3612 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3614 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3616 rlp.rlim_cur = rlp.rlim_max = 0;
3619 /* I originally chose 1000 as a nice big number that was unlikely to
3620 be exceeded. It turns out that some older OS have a fixed upper limit of
3623 if (rlp.rlim_cur < 1000)
3625 rlp.rlim_cur = rlp.rlim_max = 1000;
3626 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3628 rlp.rlim_cur = rlp.rlim_max = 256;
3629 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3630 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3637 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3639 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3641 rlp.rlim_cur = rlp.rlim_max = 0;
3644 #ifdef RLIM_INFINITY
3645 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3647 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3649 if (rlp.rlim_cur < 1000)
3651 rlp.rlim_cur = rlp.rlim_max = 1000;
3653 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3654 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3660 /* Exim is normally entered as root (but some special configurations are
3661 possible that don't do this). However, it always spins off sub-processes that
3662 set their uid and gid as required for local delivery. We don't want to pass on
3663 any extra groups that root may belong to, so we want to get rid of them all at
3666 We need to obey setgroups() at this stage, before possibly giving up root
3667 privilege for a changed configuration file, but later on we might need to
3668 check on the additional groups for the admin user privilege - can't do that
3669 till after reading the config, which might specify the exim gid. Therefore,
3670 save the group list here first. */
3672 group_count = getgroups(NGROUPS_MAX, group_list);
3673 if (group_count < 0)
3675 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3679 /* There is a fundamental difference in some BSD systems in the matter of
3680 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3681 known not to be different. On the "different" systems there is a single group
3682 list, and the first entry in it is the current group. On all other versions of
3683 Unix there is a supplementary group list, which is in *addition* to the current
3684 group. Consequently, to get rid of all extraneous groups on a "standard" system
3685 you pass over 0 groups to setgroups(), while on a "different" system you pass
3686 over a single group - the current group, which is always the first group in the
3687 list. Calling setgroups() with zero groups on a "different" system results in
3688 an error return. The following code should cope with both types of system.
3690 However, if this process isn't running as root, setgroups() can't be used
3691 since you have to be root to run it, even if throwing away groups. Not being
3692 root here happens only in some unusual configurations. We just ignore the
3695 if (setgroups(0, NULL) != 0)
3697 if (setgroups(1, group_list) != 0 && !unprivileged)
3699 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3704 /* If the configuration file name has been altered by an argument on the
3705 command line (either a new file name or a macro definition) and the caller is
3706 not root, or if this is a filter testing run, remove any setuid privilege the
3707 program has and run as the underlying user.
3709 The exim user is locked out of this, which severely restricts the use of -C
3712 Otherwise, set the real ids to the effective values (should be root unless run
3713 from inetd, which it can either be root or the exim uid, if one is configured).
3715 There is a private mechanism for bypassing some of this, in order to make it
3716 possible to test lots of configurations automatically, without having either to
3717 recompile each time, or to patch in an actual configuration file name and other
3718 values (such as the path name). If running in the test harness, pretend that
3719 configuration file changes and macro definitions haven't happened. */
3722 (!f.trusted_config || /* Config changed, or */
3723 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3724 real_uid != root_uid && /* Not root, and */
3725 !f.running_in_test_harness /* Not fudged */
3727 expansion_test /* expansion testing */
3729 filter_test != FTEST_NONE) /* Filter testing */
3731 setgroups(group_count, group_list);
3732 exim_setugid(real_uid, real_gid, FALSE,
3733 US"-C, -D, -be or -bf forces real uid");
3734 removed_privilege = TRUE;
3736 /* In the normal case when Exim is called like this, stderr is available
3737 and should be used for any logging information because attempts to write
3738 to the log will usually fail. To arrange this, we unset really_exim. However,
3739 if no stderr is available there is no point - we might as well have a go
3740 at the log (if it fails, syslog will be written).
3742 Note that if the invoker is Exim, the logs remain available. Messing with
3743 this causes unlogged successful deliveries. */
3745 if ((log_stderr != NULL) && (real_uid != exim_uid))
3746 f.really_exim = FALSE;
3749 /* Privilege is to be retained for the moment. It may be dropped later,
3750 depending on the job that this Exim process has been asked to do. For now, set
3751 the real uid to the effective so that subsequent re-execs of Exim are done by a
3754 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3756 /* If testing a filter, open the file(s) now, before wasting time doing other
3757 setups and reading the message. */
3759 if ((filter_test & FTEST_SYSTEM) != 0)
3761 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3764 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3766 return EXIT_FAILURE;
3770 if ((filter_test & FTEST_USER) != 0)
3772 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3775 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3777 return EXIT_FAILURE;
3781 /* Initialise lookup_list
3782 If debugging, already called above via version reporting.
3783 In either case, we initialise the list of available lookups while running
3784 as root. All dynamically modules are loaded from a directory which is
3785 hard-coded into the binary and is code which, if not a module, would be
3786 part of Exim already. Ability to modify the content of the directory
3787 is equivalent to the ability to modify a setuid binary!
3789 This needs to happen before we read the main configuration. */
3793 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3796 /* Read the main runtime configuration data; this gives up if there
3797 is a failure. It leaves the configuration file open so that the subsequent
3798 configuration data for delivery can be read if needed.
3800 NOTE: immediatly after opening the configuration file we change the working
3801 directory to "/"! Later we change to $spool_directory. We do it there, because
3802 during readconf_main() some expansion takes place already. */
3804 /* Store the initial cwd before we change directories. Can be NULL if the
3805 dir has already been unlinked. */
3806 initial_cwd = os_getcwd(NULL, 0);
3809 -be[m] expansion test -
3810 -b[fF] filter test new
3812 -bmalware malware_test_file new
3814 -brw rewrite test new
3816 -bv[s] address verify -
3818 -bP <option> (except -bP config, which sets list_config)
3820 If any of these options is set, we suppress warnings about configuration
3821 issues (currently about tls_advertise_hosts and keep_environment not being
3824 readconf_main(checking || list_options);
3827 /* Now in directory "/" */
3829 if (cleanup_environment() == FALSE)
3830 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3833 /* If an action on specific messages is requested, or if a daemon or queue
3834 runner is being started, we need to know if Exim was called by an admin user.
3835 This is the case if the real user is root or exim, or if the real group is
3836 exim, or if one of the supplementary groups is exim or a group listed in
3837 admin_groups. We don't fail all message actions immediately if not admin_user,
3838 since some actions can be performed by non-admin users. Instead, set admin_user
3839 for later interrogation. */
3841 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3842 f.admin_user = TRUE;
3846 for (i = 0; i < group_count && !f.admin_user; i++)
3847 if (group_list[i] == exim_gid)
3848 f.admin_user = TRUE;
3849 else if (admin_groups)
3850 for (j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3851 if (admin_groups[j] == group_list[i])
3852 f.admin_user = TRUE;
3855 /* Another group of privileged users are the trusted users. These are root,
3856 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3857 are permitted to specify sender_addresses with -f on the command line, and
3858 other message parameters as well. */
3860 if (real_uid == root_uid || real_uid == exim_uid)
3861 f.trusted_caller = TRUE;
3867 for (i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3868 if (trusted_users[i] == real_uid)
3869 f.trusted_caller = TRUE;
3872 for (i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3873 if (trusted_groups[i] == real_gid)
3874 f.trusted_caller = TRUE;
3875 else for (j = 0; j < group_count && !f.trusted_caller; j++)
3876 if (trusted_groups[i] == group_list[j])
3877 f.trusted_caller = TRUE;
3880 /* At this point, we know if the user is privileged and some command-line
3881 options become possibly impermissible, depending upon the configuration file. */
3883 if (checking && commandline_checks_require_admin && !f.admin_user) {
3884 fprintf(stderr, "exim: those command-line flags are set to require admin\n");
3888 /* Handle the decoding of logging options. */
3890 decode_bits(log_selector, log_selector_size, log_notall,
3891 log_selector_string, log_options, log_options_count, US"log", 0);
3896 debug_printf("configuration file is %s\n", config_main_filename);
3897 debug_printf("log selectors =");
3898 for (i = 0; i < log_selector_size; i++)
3899 debug_printf(" %08x", log_selector[i]);
3903 /* If domain literals are not allowed, check the sender address that was
3904 supplied with -f. Ditto for a stripped trailing dot. */
3906 if (sender_address != NULL)
3908 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3910 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3911 "allowed\n", sender_address);
3912 return EXIT_FAILURE;
3914 if (f_end_dot && !strip_trailing_dot)
3916 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3917 "(trailing dot not allowed)\n", sender_address);
3918 return EXIT_FAILURE;
3922 /* See if an admin user overrode our logging. */
3924 if (cmdline_syslog_name != NULL)
3928 syslog_processname = cmdline_syslog_name;
3929 log_file_path = string_copy(CUS"syslog");
3933 /* not a panic, non-privileged users should not be able to spam paniclog */
3935 "exim: you lack sufficient privilege to specify syslog process name\n");
3936 return EXIT_FAILURE;
3940 /* Paranoia check of maximum lengths of certain strings. There is a check
3941 on the length of the log file path in log.c, which will come into effect
3942 if there are any calls to write the log earlier than this. However, if we
3943 get this far but the string is very long, it is better to stop now than to
3944 carry on and (e.g.) receive a message and then have to collapse. The call to
3945 log_write() from here will cause the ultimate panic collapse if the complete
3946 file name exceeds the buffer length. */
3948 if (Ustrlen(log_file_path) > 200)
3949 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3950 "log_file_path is longer than 200 chars: aborting");
3952 if (Ustrlen(pid_file_path) > 200)
3953 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3954 "pid_file_path is longer than 200 chars: aborting");
3956 if (Ustrlen(spool_directory) > 200)
3957 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3958 "spool_directory is longer than 200 chars: aborting");
3960 /* Length check on the process name given to syslog for its TAG field,
3961 which is only permitted to be 32 characters or less. See RFC 3164. */
3963 if (Ustrlen(syslog_processname) > 32)
3964 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3965 "syslog_processname is longer than 32 chars: aborting");
3970 log_write(0, LOG_MAIN, "%s", log_oneline);
3971 return EXIT_SUCCESS;
3974 return EXIT_FAILURE;
3976 /* In some operating systems, the environment variable TMPDIR controls where
3977 temporary files are created; Exim doesn't use these (apart from when delivering
3978 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3979 If TMPDIR is found in the environment, reset it to the value defined in the
3980 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3981 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3982 EXIM_TMPDIR by the build scripts.
3988 if (environ) for (p = USS environ; *p; p++)
3989 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3991 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3992 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3994 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3999 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4000 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4001 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4002 called by a user who has set the TZ variable. This then affects the timestamps
4003 in log files and in Received: headers, and any created Date: header lines. The
4004 required timezone is settable in the configuration file, so nothing can be done
4005 about this earlier - but hopefully nothing will normally be logged earlier than
4006 this. We have to make a new environment if TZ is wrong, but don't bother if
4007 timestamps_utc is set, because then all times are in UTC anyway. */
4009 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4010 f.timestamps_utc = TRUE;
4013 uschar *envtz = US getenv("TZ");
4015 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4016 : timezone_string != NULL
4019 uschar **p = USS environ;
4023 if (environ) while (*p++) count++;
4024 if (!envtz) count++;
4025 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4026 if (environ) for (p = USS environ; *p; p++)
4027 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4028 if (timezone_string)
4030 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4031 sprintf(CS *newp++, "TZ=%s", timezone_string);
4036 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4037 tod_stamp(tod_log));
4041 /* Handle the case when we have removed the setuid privilege because of -C or
4042 -D. This means that the caller of Exim was not root.
4044 There is a problem if we were running as the Exim user. The sysadmin may
4045 expect this case to retain privilege because "the binary was called by the
4046 Exim user", but it hasn't, because either the -D option set macros, or the
4047 -C option set a non-trusted configuration file. There are two possibilities:
4049 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4050 to do message deliveries. Thus, the fact that it is running as a
4051 non-privileged user is plausible, and might be wanted in some special
4052 configurations. However, really_exim will have been set false when
4053 privilege was dropped, to stop Exim trying to write to its normal log
4054 files. Therefore, re-enable normal log processing, assuming the sysadmin
4055 has set up the log directory correctly.
4057 (2) If deliver_drop_privilege is not set, the configuration won't work as
4058 apparently intended, and so we log a panic message. In order to retain
4059 root for -C or -D, the caller must either be root or be invoking a
4060 trusted configuration file (when deliver_drop_privilege is false). */
4062 if ( removed_privilege
4063 && (!f.trusted_config || opt_D_used)
4064 && real_uid == exim_uid)
4065 if (deliver_drop_privilege)
4066 f.really_exim = TRUE; /* let logging work normally */
4068 log_write(0, LOG_MAIN|LOG_PANIC,
4069 "exim user lost privilege for using %s option",
4070 f.trusted_config? "-D" : "-C");
4072 /* Start up Perl interpreter if Perl support is configured and there is a
4073 perl_startup option, and the configuration or the command line specifies
4074 initializing starting. Note that the global variables are actually called
4075 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4078 if (perl_start_option != 0)
4079 opt_perl_at_start = (perl_start_option > 0);
4080 if (opt_perl_at_start && opt_perl_startup != NULL)
4083 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4084 errstr = init_perl(opt_perl_startup);
4087 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4088 return EXIT_FAILURE;
4090 opt_perl_started = TRUE;
4092 #endif /* EXIM_PERL */
4094 /* Log the arguments of the call if the configuration file said so. This is
4095 a debugging feature for finding out what arguments certain MUAs actually use.
4096 Don't attempt it if logging is disabled, or if listing variables or if
4097 verifying/testing addresses or expansions. */
4099 if ( (debug_selector & D_any || LOGGING(arguments))
4100 && f.really_exim && !list_options && !checking)
4103 uschar *p = big_buffer;
4104 Ustrcpy(p, "cwd= (failed)");
4110 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4111 p += 4 + Ustrlen(initial_cwd);
4112 /* in case p is near the end and we don't provide enough space for
4113 * string_format to be willing to write. */
4117 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4119 for (i = 0; i < argc; i++)
4121 int len = Ustrlen(argv[i]);
4122 const uschar *printing;
4124 if (p + len + 8 >= big_buffer + big_buffer_size)
4127 log_write(0, LOG_MAIN, "%s", big_buffer);
4128 Ustrcpy(big_buffer, "...");
4131 printing = string_printing(argv[i]);
4132 if (printing[0] == 0) quote = US"\""; else
4134 const uschar *pp = printing;
4136 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4138 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4139 (p - big_buffer) - 4), printing, quote);
4142 if (LOGGING(arguments))
4143 log_write(0, LOG_MAIN, "%s", big_buffer);
4145 debug_printf("%s\n", big_buffer);
4148 /* Set the working directory to be the top-level spool directory. We don't rely
4149 on this in the code, which always uses fully qualified names, but it's useful
4150 for core dumps etc. Don't complain if it fails - the spool directory might not
4151 be generally accessible and calls with the -C option (and others) have lost
4152 privilege by now. Before the chdir, we try to ensure that the directory exists.
4155 if (Uchdir(spool_directory) != 0)
4158 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4159 dummy = /* quieten compiler */ Uchdir(spool_directory);
4160 dummy = dummy; /* yet more compiler quietening, sigh */
4163 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4164 alias file. Exim doesn't have such a concept, but this call is screwed into
4165 Sun's YP makefiles. Handle this by calling a configured script, as the real
4166 user who called Exim. The -oA option can be used to pass an argument to the
4171 (void)fclose(config_file);
4172 if (bi_command != NULL)
4176 argv[i++] = bi_command;
4177 if (alias_arg != NULL) argv[i++] = alias_arg;
4180 setgroups(group_count, group_list);
4181 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4183 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4184 (argv[1] == NULL)? US"" : argv[1]);
4186 execv(CS argv[0], (char *const *)argv);
4187 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4192 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4197 /* We moved the admin/trusted check to be immediately after reading the
4198 configuration file. We leave these prints here to ensure that syslog setup,
4199 logfile setup, and so on has already happened. */
4201 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4202 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4204 /* Only an admin user may start the daemon or force a queue run in the default
4205 configuration, but the queue run restriction can be relaxed. Only an admin
4206 user may request that a message be returned to its sender forthwith. Only an
4207 admin user may specify a debug level greater than D_v (because it might show
4208 passwords, etc. in lookup queries). Only an admin user may request a queue
4209 count. Only an admin user can use the test interface to scan for email
4210 (because Exim will be in the spool dir and able to look at mails). */
4214 BOOL debugset = (debug_selector & ~D_v) != 0;
4215 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4216 (count_queue && queue_list_requires_admin) ||
4217 (list_queue && queue_list_requires_admin) ||
4218 (queue_interval >= 0 && prod_requires_admin) ||
4219 (debugset && !f.running_in_test_harness))
4221 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4226 /* If the real user is not root or the exim uid, the argument for passing
4227 in an open TCP/IP connection for another message is not permitted, nor is
4228 running with the -N option for any delivery action, unless this call to exim is
4229 one that supplied an input message, or we are using a patched exim for
4230 regression testing. */
4232 if (real_uid != root_uid && real_uid != exim_uid &&
4233 (continue_hostname != NULL ||
4235 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4236 )) && !f.running_in_test_harness)
4238 fprintf(stderr, "exim: Permission denied\n");
4239 return EXIT_FAILURE;
4242 /* If the caller is not trusted, certain arguments are ignored when running for
4243 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4244 Note that authority for performing certain actions on messages is tested in the
4245 queue_action() function. */
4247 if (!f.trusted_caller && !checking)
4249 sender_host_name = sender_host_address = interface_address =
4250 sender_ident = received_protocol = NULL;
4251 sender_host_port = interface_port = 0;
4252 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4255 /* If a sender host address is set, extract the optional port number off the
4256 end of it and check its syntax. Do the same thing for the interface address.
4257 Exim exits if the syntax is bad. */
4261 if (sender_host_address != NULL)
4262 sender_host_port = check_port(sender_host_address);
4263 if (interface_address != NULL)
4264 interface_port = check_port(interface_address);
4267 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4270 if (f.trusted_caller)
4272 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4273 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4277 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4278 return EXIT_FAILURE;
4282 /* If an SMTP message is being received check to see if the standard input is a
4283 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4284 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4289 union sockaddr_46 inetd_sock;
4290 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4291 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4293 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4294 if (family == AF_INET || family == AF_INET6)
4296 union sockaddr_46 interface_sock;
4297 size = sizeof(interface_sock);
4299 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4300 interface_address = host_ntoa(-1, &interface_sock, NULL,
4303 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4305 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4308 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4309 NULL, &sender_host_port);
4310 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4311 "inetd is not supported when mua_wrapper is set");
4316 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4317 return EXIT_FAILURE;
4323 /* If the load average is going to be needed while receiving a message, get it
4324 now for those OS that require the first call to os_getloadavg() to be done as
4325 root. There will be further calls later for each message received. */
4327 #ifdef LOAD_AVG_NEEDS_ROOT
4328 if (receiving_message &&
4329 (queue_only_load >= 0 ||
4330 (f.is_inetd && smtp_load_reserve >= 0)
4333 load_average = OS_GETLOADAVG();
4337 /* The queue_only configuration option can be overridden by -odx on the command
4338 line, except that if queue_only_override is false, queue_only cannot be unset
4339 from the command line. */
4341 if (queue_only_set && (queue_only_override || arg_queue_only))
4342 queue_only = arg_queue_only;
4344 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4347 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4348 if (arg_smtp_receive_timeout >= 0)
4349 smtp_receive_timeout = arg_smtp_receive_timeout;
4351 /* If Exim was started with root privilege, unless we have already removed the
4352 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4353 except when starting the daemon or doing some kind of delivery or address
4354 testing (-bt). These are the only cases when root need to be retained. We run
4355 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4356 retained only for starting the daemon. We always do the initgroups() in this
4357 situation (controlled by the TRUE below), in order to be as close as possible
4358 to the state Exim usually runs in. */
4360 if (!unprivileged && /* originally had root AND */
4361 !removed_privilege && /* still got root AND */
4362 !f.daemon_listen && /* not starting the daemon */
4363 queue_interval <= 0 && /* (either kind of daemon) */
4365 deliver_drop_privilege || /* requested unprivileged */
4367 queue_interval < 0 && /* not running the queue */
4368 (msg_action_arg < 0 || /* and */
4369 msg_action != MSG_DELIVER) && /* not delivering and */
4370 (!checking || !f.address_test_mode) /* not address checking */
4372 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4374 /* When we are retaining a privileged uid, we still change to the exim gid. */
4379 rv = setgid(exim_gid);
4380 /* Impact of failure is that some stuff might end up with an incorrect group.
4381 We track this for failures from root, since any attempt to change privilege
4382 by root should succeed and failures should be examined. For non-root,
4383 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4384 no need to complain then. */
4386 if (!(unprivileged || removed_privilege))
4389 "exim: changing group failed: %s\n", strerror(errno));
4393 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4394 (long int)exim_gid, strerror(errno));
4397 /* Handle a request to scan a file for malware */
4398 if (malware_test_file)
4400 #ifdef WITH_CONTENT_SCAN
4402 set_process_info("scanning file for malware");
4403 result = malware_in_file(malware_test_file);
4406 printf("No malware found.\n");
4411 printf("Malware lookup returned non-okay/fail: %d\n", result);
4415 printf("Malware found: %s\n", malware_name);
4417 printf("Malware scan detected malware of unknown name.\n");
4419 printf("Malware scanning not enabled at compile time.\n");
4424 /* Handle a request to list the delivery queue */
4428 set_process_info("listing the queue");
4429 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4433 /* Handle a request to count the delivery queue */
4437 set_process_info("counting the queue");
4442 /* Handle actions on specific messages, except for the force delivery and
4443 message load actions, which are done below. Some actions take a whole list of
4444 message ids, which are known to continue up to the end of the arguments. Others
4445 take a single message id and then operate on the recipients list. */
4447 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4449 int yield = EXIT_SUCCESS;
4450 set_process_info("acting on specified messages");
4452 if (!one_msg_action)
4454 for (i = msg_action_arg; i < argc; i++)
4455 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4456 yield = EXIT_FAILURE;
4459 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4460 recipients_arg)) yield = EXIT_FAILURE;
4464 /* We used to set up here to skip reading the ACL section, on
4465 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4466 Now, since the intro of the ${acl } expansion, ACL definitions may be
4467 needed in transports so we lost the optimisation. */
4471 /* The configuration data will have been read into POOL_PERM because we won't
4472 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4473 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4474 configuration were read into POOL_MAIN, because we don't do any resets till
4475 later on. However, it seems right, and it does ensure that both pools get used.
4478 store_pool = POOL_MAIN;
4480 /* Handle the -brt option. This is for checking out retry configurations.
4481 The next three arguments are a domain name or a complete address, and
4482 optionally two error numbers. All it does is to call the function that
4483 scans the retry configuration data. */
4485 if (test_retry_arg >= 0)
4487 retry_config *yield;
4488 int basic_errno = 0;
4492 if (test_retry_arg >= argc)
4494 printf("-brt needs a domain or address argument\n");
4495 exim_exit(EXIT_FAILURE, US"main");
4497 s1 = argv[test_retry_arg++];
4500 /* If the first argument contains no @ and no . it might be a local user
4501 or it might be a single-component name. Treat as a domain. */
4503 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4505 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4506 "being \ntreated as a one-component domain, not as a local part.\n\n",
4510 /* There may be an optional second domain arg. */
4512 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4513 s2 = argv[test_retry_arg++];
4515 /* The final arg is an error name */
4517 if (test_retry_arg < argc)
4519 uschar *ss = argv[test_retry_arg];
4521 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4524 printf("%s\n", CS error);
4525 return EXIT_FAILURE;
4528 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4529 code > 100 as an error is for matching codes to the decade. Turn them into
4530 a real error code, off the decade. */
4532 if (basic_errno == ERRNO_MAIL4XX ||
4533 basic_errno == ERRNO_RCPT4XX ||
4534 basic_errno == ERRNO_DATA4XX)
4536 int code = (more_errno >> 8) & 255;
4538 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4539 else if (code > 100)
4540 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4544 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4545 printf("No retry information found\n");
4549 more_errno = yield->more_errno;
4550 printf("Retry rule: %s ", yield->pattern);
4552 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4554 printf("quota%s%s ",
4555 (more_errno > 0)? "_" : "",
4556 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4558 else if (yield->basic_errno == ECONNREFUSED)
4560 printf("refused%s%s ",
4561 (more_errno > 0)? "_" : "",
4562 (more_errno == 'M')? "MX" :
4563 (more_errno == 'A')? "A" : "");
4565 else if (yield->basic_errno == ETIMEDOUT)
4568 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4570 if (more_errno != 0) printf("_%s",
4571 (more_errno == 'M')? "MX" : "A");
4574 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4575 printf("auth_failed ");
4578 for (r = yield->rules; r; r = r->next)
4580 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4581 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4587 printf(",%d.", x/1000);
4601 exim_exit(EXIT_SUCCESS, US"main");
4604 /* Handle a request to list one or more configuration options */
4605 /* If -n was set, we suppress some information */
4610 set_process_info("listing variables");
4611 if (recipients_arg >= argc)
4612 fail = !readconf_print(US"all", NULL, flag_n);
4613 else for (i = recipients_arg; i < argc; i++)
4616 (Ustrcmp(argv[i], "router") == 0 ||
4617 Ustrcmp(argv[i], "transport") == 0 ||
4618 Ustrcmp(argv[i], "authenticator") == 0 ||
4619 Ustrcmp(argv[i], "macro") == 0 ||
4620 Ustrcmp(argv[i], "environment") == 0))
4622 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4626 fail = !readconf_print(argv[i], NULL, flag_n);
4628 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4633 set_process_info("listing config");
4634 exim_exit(readconf_print(US"config", NULL, flag_n)
4635 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4639 /* Initialise subsystems as required */
4640 #ifndef DISABLE_DKIM
4646 /* Handle a request to deliver one or more messages that are already on the
4647 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4648 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4650 Delivery of specific messages is typically used for a small number when
4651 prodding by hand (when the option forced_delivery will be set) or when
4652 re-execing to regain root privilege. Each message delivery must happen in a
4653 separate process, so we fork a process for each one, and run them sequentially
4654 so that debugging output doesn't get intertwined, and to avoid spawning too
4655 many processes if a long list is given. However, don't fork for the last one;
4656 this saves a process in the common case when Exim is called to deliver just one
4659 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4661 if (prod_requires_admin && !f.admin_user)
4663 fprintf(stderr, "exim: Permission denied\n");
4664 exim_exit(EXIT_FAILURE, US"main");
4666 set_process_info("delivering specified messages");
4667 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4668 for (i = msg_action_arg; i < argc; i++)
4673 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4674 else if ((pid = fork()) == 0)
4676 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4677 _exit(EXIT_SUCCESS);
4681 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4683 exim_exit(EXIT_FAILURE, US"main");
4687 exim_exit(EXIT_SUCCESS, US"main");
4691 /* If only a single queue run is requested, without SMTP listening, we can just
4692 turn into a queue runner, with an optional starting message id. */
4694 if (queue_interval == 0 && !f.daemon_listen)
4696 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4697 (start_queue_run_id == NULL)? US"" : US" starting at ",
4698 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4699 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4700 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4702 set_process_info("running the '%s' queue (single queue run)", queue_name);
4704 set_process_info("running the queue (single queue run)");
4705 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4706 exim_exit(EXIT_SUCCESS, US"main");
4710 /* Find the login name of the real user running this process. This is always
4711 needed when receiving a message, because it is written into the spool file. It
4712 may also be used to construct a from: or a sender: header, and in this case we
4713 need the user's full name as well, so save a copy of it, checked for RFC822
4714 syntax and munged if necessary, if it hasn't previously been set by the -F
4715 argument. We may try to get the passwd entry more than once, in case NIS or
4716 other delays are in evidence. Save the home directory for use in filter testing
4721 if ((pw = getpwuid(real_uid)) != NULL)
4723 originator_login = string_copy(US pw->pw_name);
4724 originator_home = string_copy(US pw->pw_dir);
4726 /* If user name has not been set by -F, set it from the passwd entry
4727 unless -f has been used to set the sender address by a trusted user. */
4729 if (!originator_name)
4731 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4733 uschar *name = US pw->pw_gecos;
4734 uschar *amp = Ustrchr(name, '&');
4737 /* Most Unix specify that a '&' character in the gecos field is
4738 replaced by a copy of the login name, and some even specify that
4739 the first character should be upper cased, so that's what we do. */
4744 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4745 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4746 buffer[loffset] = toupper(buffer[loffset]);
4750 /* If a pattern for matching the gecos field was supplied, apply
4751 it and then expand the name string. */
4753 if (gecos_pattern && gecos_name)
4756 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4758 if (regex_match_and_setup(re, name, 0, -1))
4760 uschar *new_name = expand_string(gecos_name);
4764 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4765 "gecos field \"%s\"\n", new_name, name);
4768 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4769 "\"%s\": %s\n", gecos_name, expand_string_message);
4771 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4772 "gecos field \"%s\"\n", gecos_pattern, name);
4773 store_free((void *)re);
4775 originator_name = string_copy(name);
4778 /* A trusted caller has used -f but not -F */
4780 else originator_name = US"";
4783 /* Break the retry loop */
4788 if (++i > finduser_retries) break;
4792 /* If we cannot get a user login, log the incident and give up, unless the
4793 configuration specifies something to use. When running in the test harness,
4794 any setting of unknown_login overrides the actual name. */
4796 if (originator_login == NULL || f.running_in_test_harness)
4798 if (unknown_login != NULL)
4800 originator_login = expand_string(unknown_login);
4801 if (originator_name == NULL && unknown_username != NULL)
4802 originator_name = expand_string(unknown_username);
4803 if (originator_name == NULL) originator_name = US"";
4805 if (originator_login == NULL)
4806 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4810 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4813 originator_name = string_copy(parse_fix_phrase(originator_name,
4814 Ustrlen(originator_name), big_buffer, big_buffer_size));
4816 /* If a message is created by this call of Exim, the uid/gid of its originator
4817 are those of the caller. These values are overridden if an existing message is
4818 read in from the spool. */
4820 originator_uid = real_uid;
4821 originator_gid = real_gid;
4823 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4824 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4826 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4827 returns. We leave this till here so that the originator_ fields are available
4828 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4831 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4835 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4836 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4837 "mua_wrapper is set");
4842 /* If the sender ident has not been set (by a trusted caller) set it to
4843 the caller. This will get overwritten below for an inetd call. If a trusted
4844 caller has set it empty, unset it. */
4846 if (sender_ident == NULL) sender_ident = originator_login;
4847 else if (sender_ident[0] == 0) sender_ident = NULL;
4849 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4850 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4851 originator_* variables set. */
4853 if (test_rewrite_arg >= 0)
4855 f.really_exim = FALSE;
4856 if (test_rewrite_arg >= argc)
4858 printf("-brw needs an address argument\n");
4859 exim_exit(EXIT_FAILURE, US"main");
4861 rewrite_test(argv[test_rewrite_arg]);
4862 exim_exit(EXIT_SUCCESS, US"main");
4865 /* A locally-supplied message is considered to be coming from a local user
4866 unless a trusted caller supplies a sender address with -f, or is passing in the
4867 message via SMTP (inetd invocation or otherwise). */
4869 if ((sender_address == NULL && !smtp_input) ||
4870 (!f.trusted_caller && filter_test == FTEST_NONE))
4872 f.sender_local = TRUE;
4874 /* A trusted caller can supply authenticated_sender and authenticated_id
4875 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4876 defaults except when host checking. */
4878 if (authenticated_sender == NULL && !host_checking)
4879 authenticated_sender = string_sprintf("%s@%s", originator_login,
4880 qualify_domain_sender);
4881 if (authenticated_id == NULL && !host_checking)
4882 authenticated_id = originator_login;
4885 /* Trusted callers are always permitted to specify the sender address.
4886 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4887 is specified is the empty address. However, if a trusted caller does not
4888 specify a sender address for SMTP input, we leave sender_address unset. This
4889 causes the MAIL commands to be honoured. */
4891 if ((!smtp_input && sender_address == NULL) ||
4892 !receive_check_set_sender(sender_address))
4894 /* Either the caller is not permitted to set a general sender, or this is
4895 non-SMTP input and the trusted caller has not set a sender. If there is no
4896 sender, or if a sender other than <> is set, override with the originator's
4897 login (which will get qualified below), except when checking things. */
4899 if (sender_address == NULL /* No sender_address set */
4901 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4902 !checking)) /* Not running tests, including filter tests */
4904 sender_address = originator_login;
4905 f.sender_address_forced = FALSE;
4906 sender_address_domain = 0;
4910 /* Remember whether an untrusted caller set the sender address */
4912 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4914 /* Ensure that the sender address is fully qualified unless it is the empty
4915 address, which indicates an error message, or doesn't exist (root caller, smtp
4916 interface, no -f argument). */
4918 if (sender_address != NULL && sender_address[0] != 0 &&
4919 sender_address_domain == 0)
4920 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4921 qualify_domain_sender);
4923 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4925 /* Handle a request to verify a list of addresses, or test them for delivery.
4926 This must follow the setting of the sender address, since routers can be
4927 predicated upon the sender. If no arguments are given, read addresses from
4928 stdin. Set debug_level to at least D_v to get full output for address testing.
4931 if (verify_address_mode || f.address_test_mode)
4934 int flags = vopt_qualify;
4936 if (verify_address_mode)
4938 if (!verify_as_sender) flags |= vopt_is_recipient;
4939 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4944 flags |= vopt_is_recipient;
4945 debug_selector |= D_v;
4946 debug_file = stderr;
4947 debug_fd = fileno(debug_file);
4948 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4951 if (recipients_arg < argc)
4953 while (recipients_arg < argc)
4955 uschar *s = argv[recipients_arg++];
4958 BOOL finished = FALSE;
4959 uschar *ss = parse_find_address_end(s, FALSE);
4960 if (*ss == ',') *ss = 0; else finished = TRUE;
4961 test_address(s, flags, &exit_value);
4964 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4971 uschar *s = get_stdinput(NULL, NULL);
4972 if (s == NULL) break;
4973 test_address(s, flags, &exit_value);
4977 exim_exit(exit_value, US"main");
4980 /* Handle expansion checking. Either expand items on the command line, or read
4981 from stdin if there aren't any. If -Mset was specified, load the message so
4982 that its variables can be used, but restrict this facility to admin users.
4983 Otherwise, if -bem was used, read a message from stdin. */
4987 dns_init(FALSE, FALSE, FALSE);
4988 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4990 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4993 fprintf(stderr, "exim: permission denied\n");
4996 message_id = argv[msg_action_arg];
4997 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4998 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4999 printf ("Failed to load message datafile %s\n", message_id);
5000 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5001 printf ("Failed to load message %s\n", message_id);
5004 /* Read a test message from a file. We fudge it up to be on stdin, saving
5005 stdin itself for later reading of expansion strings. */
5007 else if (expansion_test_message)
5009 int save_stdin = dup(0);
5010 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5013 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
5015 return EXIT_FAILURE;
5018 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5019 message_ended = END_NOTENDED;
5020 read_message_body(receive_msg(extract_recipients));
5021 message_linecount += body_linecount;
5022 (void)dup2(save_stdin, 0);
5023 (void)close(save_stdin);
5024 clearerr(stdin); /* Required by Darwin */
5027 /* Only admin users may see config-file macros this way */
5029 if (!f.admin_user) macros_user = macros = mlast = NULL;
5031 /* Allow $recipients for this testing */
5033 f.enable_dollar_recipients = TRUE;
5035 /* Expand command line items */
5037 if (recipients_arg < argc)
5038 while (recipients_arg < argc)
5039 expansion_test_line(argv[recipients_arg++]);
5045 char *(*fn_readline)(const char *) = NULL;
5046 void (*fn_addhist)(const char *) = NULL;
5050 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5053 while (s = get_stdinput(fn_readline, fn_addhist))
5054 expansion_test_line(s);
5057 if (dlhandle) dlclose(dlhandle);
5061 /* The data file will be open after -Mset */
5063 if (deliver_datafile >= 0)
5065 (void)close(deliver_datafile);
5066 deliver_datafile = -1;
5069 exim_exit(EXIT_SUCCESS, US"main: expansion test");
5073 /* The active host name is normally the primary host name, but it can be varied
5074 for hosts that want to play several parts at once. We need to ensure that it is
5075 set for host checking, and for receiving messages. */
5077 smtp_active_hostname = primary_hostname;
5078 if (raw_active_hostname != NULL)
5080 uschar *nah = expand_string(raw_active_hostname);
5083 if (!f.expand_string_forcedfail)
5084 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5085 "(smtp_active_hostname): %s", raw_active_hostname,
5086 expand_string_message);
5088 else if (nah[0] != 0) smtp_active_hostname = nah;
5091 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5092 given IP address so that the blocking and relay configuration can be tested.
5093 Unless a sender_ident was set by -oMt, we discard it (the default is the
5094 caller's login name). An RFC 1413 call is made only if we are running in the
5095 test harness and an incoming interface and both ports are specified, because
5096 there is no TCP/IP call to find the ident for. */
5103 if (!sender_ident_set)
5105 sender_ident = NULL;
5106 if (f.running_in_test_harness && sender_host_port != 0 &&
5107 interface_address != NULL && interface_port != 0)
5108 verify_get_ident(1413);
5111 /* In case the given address is a non-canonical IPv6 address, canonicalize
5112 it. The code works for both IPv4 and IPv6, as it happens. */
5114 size = host_aton(sender_host_address, x);
5115 sender_host_address = store_get(48); /* large enough for full IPv6 */
5116 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5118 /* Now set up for testing */
5120 host_build_sender_fullhost();
5124 f.sender_local = FALSE;
5125 f.sender_host_notsocket = TRUE;
5126 debug_file = stderr;
5127 debug_fd = fileno(debug_file);
5128 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5129 "**** but without any ident (RFC 1413) callback.\n"
5130 "**** This is not for real!\n\n",
5131 sender_host_address);
5133 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5134 if (verify_check_host(&hosts_connection_nolog) == OK)
5135 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5136 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5138 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5139 because a log line has already been written for all its failure exists
5140 (usually "connection refused: <reason>") and writing another one is
5141 unnecessary clutter. */
5143 if (smtp_start_session())
5145 for (reset_point = store_get(0); ; store_reset(reset_point))
5147 if (smtp_setup_msg() <= 0) break;
5148 if (!receive_msg(FALSE)) break;
5150 return_path = sender_address = NULL;
5151 dnslist_domain = dnslist_matched = NULL;
5152 #ifndef DISABLE_DKIM
5153 dkim_cur_signer = NULL;
5156 deliver_localpart_orig = NULL;
5157 deliver_domain_orig = NULL;
5158 callout_address = sending_ip_address = NULL;
5159 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5163 exim_exit(EXIT_SUCCESS, US"main");
5167 /* Arrange for message reception if recipients or SMTP were specified;
5168 otherwise complain unless a version print (-bV) happened or this is a filter
5169 verification test or info dump.
5170 In the former case, show the configuration file name. */
5172 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5174 if (version_printed)
5176 if (Ustrchr(config_main_filelist, ':'))
5177 printf("Configuration file search path is %s\n", config_main_filelist);
5178 printf("Configuration file is %s\n", config_main_filename);
5179 return EXIT_SUCCESS;
5182 if (info_flag != CMDINFO_NONE)
5184 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5185 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5188 if (filter_test == FTEST_NONE)
5189 exim_usage(called_as);
5193 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5194 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5195 that we are not called from inetd, because that is rejected above. The
5196 following configuration settings are forced here:
5198 (1) Synchronous delivery (-odi)
5199 (2) Errors to stderr (-oep == -oeq)
5200 (3) No parallel remote delivery
5201 (4) Unprivileged delivery
5203 We don't force overall queueing options because there are several of them;
5204 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5205 to override any SMTP queueing. */
5209 f.synchronous_delivery = TRUE;
5210 arg_error_handling = ERRORS_STDERR;
5211 remote_max_parallel = 1;
5212 deliver_drop_privilege = TRUE;
5213 f.queue_smtp = FALSE;
5214 queue_smtp_domains = NULL;
5216 message_utf8_downconvert = -1; /* convert-if-needed */
5221 /* Prepare to accept one or more new messages on the standard input. When a
5222 message has been read, its id is returned in message_id[]. If doing immediate
5223 delivery, we fork a delivery process for each received message, except for the
5224 last one, where we can save a process switch.
5226 It is only in non-smtp mode that error_handling is allowed to be changed from
5227 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5228 sendmail error modes other than -oem ever actually used? Later: yes.) */
5230 if (!smtp_input) error_handling = arg_error_handling;
5232 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5233 logging being sent down the socket and make an identd call to get the
5236 else if (f.is_inetd)
5238 (void)fclose(stderr);
5239 exim_nullstd(); /* Re-open to /dev/null */
5240 verify_get_ident(IDENT_PORT);
5241 host_build_sender_fullhost();
5242 set_process_info("handling incoming connection from %s via inetd",
5246 /* If the sender host address has been set, build sender_fullhost if it hasn't
5247 already been done (which it will have been for inetd). This caters for the
5248 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5249 so that the test for IP options is skipped for -bs input. */
5251 if (sender_host_address && !sender_fullhost)
5253 host_build_sender_fullhost();
5254 set_process_info("handling incoming connection from %s via -oMa",
5256 f.sender_host_notsocket = TRUE;
5259 /* Otherwise, set the sender host as unknown except for inetd calls. This
5260 prevents host checking in the case of -bs not from inetd and also for -bS. */
5262 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5264 /* If stdout does not exist, then dup stdin to stdout. This can happen
5265 if exim is started from inetd. In this case fd 0 will be set to the socket,
5266 but fd 1 will not be set. This also happens for passed SMTP channels. */
5268 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5270 /* Set up the incoming protocol name and the state of the program. Root is
5271 allowed to force received protocol via the -oMr option above. If we have come
5272 via inetd, the process info has already been set up. We don't set
5273 received_protocol here for smtp input, as it varies according to
5274 batch/HELO/EHLO/AUTH/TLS. */
5278 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5279 smtp_batched_input? "batched " : "",
5280 (sender_address!= NULL)? sender_address : originator_login);
5284 int old_pool = store_pool;
5285 store_pool = POOL_PERM;
5286 if (!received_protocol)
5287 received_protocol = string_sprintf("local%s", called_as);
5288 store_pool = old_pool;
5289 set_process_info("accepting a local non-SMTP message from <%s>",
5293 /* Initialize the session_local_queue-only flag (this will be ignored if
5294 mua_wrapper is set) */
5297 session_local_queue_only = queue_only;
5299 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5300 the spool if so configured. On failure, we must not attempt to send an error
5301 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5302 error code is given.) */
5304 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5306 fprintf(stderr, "exim: insufficient disk space\n");
5307 return EXIT_FAILURE;
5310 /* If this is smtp input of any kind, real or batched, handle the start of the
5313 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5314 because a log line has already been written for all its failure exists
5315 (usually "connection refused: <reason>") and writing another one is
5316 unnecessary clutter. */
5322 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5323 if (verify_check_host(&hosts_connection_nolog) == OK)
5324 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5325 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5326 if (!smtp_start_session())
5329 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5333 /* Otherwise, set up the input size limit here. */
5337 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5338 if (expand_string_message)
5339 if (thismessage_size_limit == -1)
5340 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5341 "message_size_limit: %s", expand_string_message);
5343 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5344 "message_size_limit: %s", expand_string_message);
5347 /* Loop for several messages when reading SMTP input. If we fork any child
5348 processes, we don't want to wait for them unless synchronous delivery is
5349 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5350 same as SIG_DFL, despite the fact that documentation often lists the default as
5351 "ignore". This is a confusing area. This is what I know:
5353 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5354 processes that complete simply to go away without ever becoming defunct. You
5355 can't then wait for them - but we don't want to wait for them in the
5356 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5357 happen for all OS (e.g. *BSD is different).
5359 But that's not the end of the story. Some (many? all?) systems have the
5360 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5361 has by default, so it seems that the difference is merely one of default
5362 (compare restarting vs non-restarting signals).
5364 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5365 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5366 of the loop below. Paranoia rules.
5368 February 2003: That's *still* not the end of the story. There are now versions
5369 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5370 process then calls waitpid(), a grumble is written to the system log, because
5371 this is logically inconsistent. In other words, it doesn't like the paranoia.
5372 As a consequence of this, the waitpid() below is now excluded if we are sure
5373 that SIG_IGN works. */
5375 if (!f.synchronous_delivery)
5378 struct sigaction act;
5379 act.sa_handler = SIG_IGN;
5380 sigemptyset(&(act.sa_mask));
5381 act.sa_flags = SA_NOCLDWAIT;
5382 sigaction(SIGCHLD, &act, NULL);
5384 signal(SIGCHLD, SIG_IGN);
5388 /* Save the current store pool point, for resetting at the start of
5389 each message, and save the real sender address, if any. */
5391 reset_point = store_get(0);
5392 real_sender_address = sender_address;
5394 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5395 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5402 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5403 input and build the recipients list, before calling receive_msg() to read the
5404 message proper. Whatever sender address is given in the SMTP transaction is
5405 often ignored for local senders - we use the actual sender, which is normally
5406 either the underlying user running this process or a -f argument provided by
5407 a trusted caller. It is saved in real_sender_address. The test for whether to
5408 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5413 if ((rc = smtp_setup_msg()) > 0)
5415 if (real_sender_address != NULL &&
5416 !receive_check_set_sender(sender_address))
5418 sender_address = raw_sender = real_sender_address;
5419 sender_address_unrewritten = NULL;
5422 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5423 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5424 the very end. The result of the ACL is ignored (as for other non-SMTP
5425 messages). It is run for its potential side effects. */
5427 if (smtp_batched_input && acl_not_smtp_start != NULL)
5429 uschar *user_msg, *log_msg;
5430 f.enable_dollar_recipients = TRUE;
5431 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5432 &user_msg, &log_msg);
5433 f.enable_dollar_recipients = FALSE;
5436 /* Now get the data for the message */
5438 more = receive_msg(extract_recipients);
5439 if (message_id[0] == 0)
5441 cancel_cutthrough_connection(TRUE, US"receive dropped");
5442 if (more) goto moreloop;
5443 smtp_log_no_mail(); /* Log no mail if configured */
5444 exim_exit(EXIT_FAILURE, US"receive toplevel");
5449 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5450 smtp_log_no_mail(); /* Log no mail if configured */
5451 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5455 /* In the non-SMTP case, we have all the information from the command
5456 line, but must process it in case it is in the more general RFC822
5457 format, and in any case, to detect syntax errors. Also, it appears that
5458 the use of comma-separated lists as single arguments is common, so we
5459 had better support them. */
5465 int count = argc - recipients_arg;
5466 uschar **list = argv + recipients_arg;
5468 /* These options cannot be changed dynamically for non-SMTP messages */
5470 f.active_local_sender_retain = local_sender_retain;
5471 f.active_local_from_check = local_from_check;
5473 /* Save before any rewriting */
5475 raw_sender = string_copy(sender_address);
5477 /* Loop for each argument */
5479 for (i = 0; i < count; i++)
5481 int start, end, domain;
5483 uschar *s = list[i];
5485 /* Loop for each comma-separated address */
5489 BOOL finished = FALSE;
5491 uschar *ss = parse_find_address_end(s, FALSE);
5493 if (*ss == ',') *ss = 0; else finished = TRUE;
5495 /* Check max recipients - if -t was used, these aren't recipients */
5497 if (recipients_max > 0 && ++rcount > recipients_max &&
5498 !extract_recipients)
5499 if (error_handling == ERRORS_STDERR)
5501 fprintf(stderr, "exim: too many recipients\n");
5502 exim_exit(EXIT_FAILURE, US"main");
5506 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5507 errors_sender_rc : EXIT_FAILURE;
5511 BOOL b = allow_utf8_domains;
5512 allow_utf8_domains = TRUE;
5515 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5518 if (string_is_utf8(recipient))
5519 message_smtputf8 = TRUE;
5521 allow_utf8_domains = b;
5524 if (domain == 0 && !f.allow_unqualified_recipient)
5527 errmess = US"unqualified recipient address not allowed";
5530 if (recipient == NULL)
5532 if (error_handling == ERRORS_STDERR)
5534 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5535 string_printing(list[i]), errmess);
5536 exim_exit(EXIT_FAILURE, US"main");
5542 eblock.text1 = string_printing(list[i]);
5543 eblock.text2 = errmess;
5545 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5546 errors_sender_rc : EXIT_FAILURE;
5550 receive_add_recipient(recipient, -1);
5553 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5557 /* Show the recipients when debugging */
5562 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5563 if (recipients_list != NULL)
5565 debug_printf("Recipients:\n");
5566 for (i = 0; i < recipients_count; i++)
5567 debug_printf(" %s\n", recipients_list[i].address);
5571 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5572 ignored; rejecting here would just add complication, and it can just as
5573 well be done later. Allow $recipients to be visible in the ACL. */
5575 if (acl_not_smtp_start)
5577 uschar *user_msg, *log_msg;
5578 f.enable_dollar_recipients = TRUE;
5579 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5580 &user_msg, &log_msg);
5581 f.enable_dollar_recipients = FALSE;
5584 /* Pause for a while waiting for input. If none received in that time,
5585 close the logfile, if we had one open; then if we wait for a long-running
5586 datasource (months, in one use-case) log rotation will not leave us holding
5589 if (!receive_timeout)
5591 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5594 FD_ZERO(&r); FD_SET(0, &r);
5595 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5598 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5599 will just read the headers for the message, and not write anything onto the
5602 message_ended = END_NOTENDED;
5603 more = receive_msg(extract_recipients);
5605 /* more is always FALSE here (not SMTP message) when reading a message
5606 for real; when reading the headers of a message for filter testing,
5607 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5609 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5610 } /* Non-SMTP message reception */
5612 /* If this is a filter testing run, there are headers in store, but
5613 no message on the spool. Run the filtering code in testing mode, setting
5614 the domain to the qualify domain and the local part to the current user,
5615 unless they have been set by options. The prefix and suffix are left unset
5616 unless specified. The the return path is set to to the sender unless it has
5617 already been set from a return-path header in the message. */
5619 if (filter_test != FTEST_NONE)
5621 deliver_domain = (ftest_domain != NULL)?
5622 ftest_domain : qualify_domain_recipient;
5623 deliver_domain_orig = deliver_domain;
5624 deliver_localpart = (ftest_localpart != NULL)?
5625 ftest_localpart : originator_login;
5626 deliver_localpart_orig = deliver_localpart;
5627 deliver_localpart_prefix = ftest_prefix;
5628 deliver_localpart_suffix = ftest_suffix;
5629 deliver_home = originator_home;
5631 if (return_path == NULL)
5633 printf("Return-path copied from sender\n");
5634 return_path = string_copy(sender_address);
5637 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5638 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5640 receive_add_recipient(
5641 string_sprintf("%s%s%s@%s",
5642 (ftest_prefix == NULL)? US"" : ftest_prefix,
5644 (ftest_suffix == NULL)? US"" : ftest_suffix,
5645 deliver_domain), -1);
5647 printf("Recipient = %s\n", recipients_list[0].address);
5648 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5649 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5651 if (chdir("/")) /* Get away from wherever the user is running this from */
5653 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5654 exim_exit(EXIT_FAILURE, US"main");
5657 /* Now we run either a system filter test, or a user filter test, or both.
5658 In the latter case, headers added by the system filter will persist and be
5659 available to the user filter. We need to copy the filter variables
5662 if ((filter_test & FTEST_SYSTEM) != 0)
5663 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5664 exim_exit(EXIT_FAILURE, US"main");
5666 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5668 if ((filter_test & FTEST_USER) != 0)
5669 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5670 exim_exit(EXIT_FAILURE, US"main");
5672 exim_exit(EXIT_SUCCESS, US"main");
5675 /* Else act on the result of message reception. We should not get here unless
5676 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5677 will be TRUE. If it is not, check on the number of messages received in this
5680 if (!session_local_queue_only &&
5681 smtp_accept_queue_per_connection > 0 &&
5682 receive_messagecount > smtp_accept_queue_per_connection)
5684 session_local_queue_only = TRUE;
5685 queue_only_reason = 2;
5688 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5689 and queue_only_load is set, check that the load average is below it. If it is
5690 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5691 default), we put the whole session into queue_only mode. It then remains this
5692 way for any subsequent messages on the same SMTP connection. This is a
5693 deliberate choice; even though the load average may fall, it doesn't seem
5694 right to deliver later messages on the same call when not delivering earlier
5695 ones. However, there are odd cases where this is not wanted, so this can be
5696 changed by setting queue_only_load_latch false. */
5698 local_queue_only = session_local_queue_only;
5699 if (!local_queue_only && queue_only_load >= 0)
5701 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5702 if (local_queue_only)
5704 queue_only_reason = 3;
5705 if (queue_only_load_latch) session_local_queue_only = TRUE;
5709 /* If running as an MUA wrapper, all queueing options and freezing options
5713 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5715 /* Log the queueing here, when it will get a message id attached, but
5716 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5719 if (local_queue_only)
5721 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5722 switch(queue_only_reason)
5725 log_write(L_delay_delivery,
5726 LOG_MAIN, "no immediate delivery: more than %d messages "
5727 "received in one connection", smtp_accept_queue_per_connection);
5731 log_write(L_delay_delivery,
5732 LOG_MAIN, "no immediate delivery: load average %.2f",
5733 (double)load_average/1000.0);
5738 else if (f.queue_only_policy || f.deliver_freeze)
5739 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5741 /* Else do the delivery unless the ACL or local_scan() called for queue only
5742 or froze the message. Always deliver in a separate process. A fork failure is
5743 not a disaster, as the delivery will eventually happen on a subsequent queue
5744 run. The search cache must be tidied before the fork, as the parent will
5745 do it before exiting. The child will trigger a lookup failure and
5746 thereby defer the delivery if it tries to use (for example) a cached ldap
5747 connection that the parent has called unbind on. */
5754 if ((pid = fork()) == 0)
5757 close_unwanted(); /* Close unwanted file descriptors and TLS */
5758 exim_nullstd(); /* Ensure std{in,out,err} exist */
5760 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5761 mode, deliver_drop_privilege is forced TRUE). */
5763 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5765 delivery_re_exec(CEE_EXEC_EXIT);
5766 /* Control does not return here. */
5769 /* No need to re-exec */
5771 rc = deliver_message(message_id, FALSE, FALSE);
5773 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5774 EXIT_SUCCESS : EXIT_FAILURE);
5779 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5780 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5781 "process: %s", strerror(errno));
5785 release_cutthrough_connection(US"msg passed for delivery");
5787 /* In the parent, wait if synchronous delivery is required. This will
5788 always be the case in MUA wrapper mode. */
5790 if (f.synchronous_delivery)
5793 while (wait(&status) != pid);
5794 if ((status & 0x00ff) != 0)
5795 log_write(0, LOG_MAIN|LOG_PANIC,
5796 "process %d crashed with signal %d while delivering %s",
5797 (int)pid, status & 0x00ff, message_id);
5798 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5803 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5804 automatically reaps children (see comments above the loop), clear away any
5805 finished subprocesses here, in case there are lots of messages coming in
5806 from the same source. */
5808 #ifndef SIG_IGN_WORKS
5809 while (waitpid(-1, NULL, WNOHANG) > 0);
5813 return_path = sender_address = NULL;
5814 authenticated_sender = NULL;
5815 deliver_localpart_orig = NULL;
5816 deliver_domain_orig = NULL;
5817 deliver_host = deliver_host_address = NULL;
5818 dnslist_domain = dnslist_matched = NULL;
5819 #ifdef WITH_CONTENT_SCAN
5820 malware_name = NULL;
5822 callout_address = NULL;
5823 sending_ip_address = NULL;
5825 { int i; for(i=0; i<REGEX_VARS; i++) regex_vars[i] = NULL; }
5827 store_reset(reset_point);
5830 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5831 return 0; /* To stop compiler warning */