1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2022 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
10 /* The main function: entry point, initialization, and high-level control.
11 Also a few functions that don't naturally fit elsewhere. */
16 #if defined(__GLIBC__) && !defined(__UCLIBC__)
17 # include <gnu/libc-version.h>
24 # include <execinfo.h>
28 # include <gnutls/gnutls.h>
29 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
34 extern void init_lookup_list(void);
38 /*************************************************
39 * Function interface to store functions *
40 *************************************************/
42 /* We need some real functions to pass to the PCRE regular expression library
43 for store allocation via Exim's store manager. The normal calls are actually
44 macros that pass over location information to make tracing easier. These
45 functions just interface to the standard macro calls. A good compiler will
46 optimize out the tail recursion and so not make them too expensive. */
49 function_store_malloc(PCRE2_SIZE size, void * tag)
51 return store_malloc((int)size);
55 function_store_free(void * block, void * tag)
57 /* At least some version of pcre2 pass a null pointer */
58 if (block) store_free(block);
64 /*************************************************
65 * Enums for cmdline interface *
66 *************************************************/
68 enum commandline_info { CMDINFO_NONE=0,
69 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
74 /*************************************************
75 * Compile regular expression and panic on fail *
76 *************************************************/
78 /* This function is called when failure to compile a regular expression leads
79 to a panic exit. In other cases, pcre_compile() is called directly. In many
80 cases where this function is used, the results of the compilation are to be
81 placed in long-lived store, so we temporarily reset the store management
82 functions that PCRE uses if the use_malloc flag is set.
85 pattern the pattern to compile
86 caseless TRUE if caseless matching is required
87 use_malloc TRUE if compile into malloc store
89 Returns: pointer to the compiled pattern
93 regex_must_compile(const uschar * pattern, BOOL caseless, BOOL use_malloc)
96 int options = caseless ? PCRE_COPT|PCRE2_CASELESS : PCRE_COPT;
97 const pcre2_code * yield;
99 pcre2_general_context * gctx;
100 pcre2_compile_context * cctx;
104 gctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
105 cctx = pcre2_compile_context_create(gctx);
110 if (!(yield = pcre2_compile((PCRE2_SPTR)pattern, PCRE2_ZERO_TERMINATED, options,
111 &err, &offset, cctx)))
114 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
115 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
116 "%s at offset %ld while compiling %s", errbuf, (long)offset, pattern);
121 pcre2_compile_context_free(cctx);
122 pcre2_general_context_free(gctx);
131 pcre_gen_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
132 pcre_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
133 pcre_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
139 /*************************************************
140 * Execute regular expression and set strings *
141 *************************************************/
143 /* This function runs a regular expression match, and sets up the pointers to
144 the matched substrings. The matched strings are copied so the lifetime of
145 the subject is not a problem.
148 re the compiled expression
149 subject the subject string
150 options additional PCRE options
151 setup if < 0 do full setup
152 if >= 0 setup from setup+1 onwards,
153 excluding the full matched string
155 Returns: TRUE if matched, or FALSE
159 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
161 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
162 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
163 PCRE_EOPT | options, md, pcre_mtc_ctx);
166 if ((yield = (res >= 0)))
168 res = pcre2_get_ovector_count(md);
169 expand_nmax = setup < 0 ? 0 : setup + 1;
170 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
173 pcre2_substring_get_bynumber(md, matchnum,
174 (PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len);
175 expand_nlength[expand_nmax++] = (int)len;
179 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
182 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
183 debug_printf_indent("pcre2: %s\n", errbuf);
185 pcre2_match_data_free(md);
190 /* Check just for match with regex. Uses the common memory-handling.
194 subject string to be checked
195 slen length of subject; -1 for nul-terminated
196 rptr pointer for matched string, copied, or NULL
198 Return: TRUE for a match.
202 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
204 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
205 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
206 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
207 0, PCRE_EOPT, md, pcre_mtc_ctx);
208 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
212 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
218 /*************************************************
219 * Set up processing details *
220 *************************************************/
222 /* Save a text string for dumping when SIGUSR1 is received.
223 Do checks for overruns.
225 Arguments: format and arguments, as for printf()
230 set_process_info(const char *format, ...)
232 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
237 g = string_fmt_append(&gs, "%5d ", (int)getpid());
239 va_start(ap, format);
240 if (!string_vformat(g, 0, format, ap))
243 g = string_cat(&gs, US"**** string overflowed buffer ****");
245 g = string_catn(g, US"\n", 1);
246 string_from_gstring(g);
247 process_info_len = g->ptr;
248 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
252 /***********************************************
253 * Handler for SIGTERM *
254 ***********************************************/
257 term_handler(int sig)
263 /***********************************************
264 * Handler for SIGSEGV *
265 ***********************************************/
267 #define STACKDUMP_MAX 24
272 void * buf[STACKDUMP_MAX];
274 int nptrs = backtrace(buf, STACKDUMP_MAX);
276 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace\n");
277 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
278 if ((ss = backtrace_symbols(buf, nptrs)))
280 for (int i = 0; i < nptrs; i++)
281 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s\n", ss[i]);
285 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s\n", strerror(errno));
286 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
294 segv_handler(int sig, siginfo_t * info, void * uctx)
296 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
297 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
298 switch (info->si_code)
300 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
301 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
302 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
303 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
306 if (US info->si_addr < US 4096)
307 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
309 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
310 if (process_info_len > 0)
311 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
313 signal(SIGSEGV, SIG_DFL);
318 segv_handler(int sig)
320 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
321 if (process_info_len > 0)
322 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
324 signal(SIGSEGV, SIG_DFL);
330 /*************************************************
331 * Handler for SIGUSR1 *
332 *************************************************/
334 /* SIGUSR1 causes any exim process to write to the process log details of
335 what it is currently doing. It will only be used if the OS is capable of
336 setting up a handler that causes automatic restarting of any system call
337 that is in progress at the time.
339 This function takes care to be signal-safe.
341 Argument: the signal number (SIGUSR1)
346 usr1_handler(int sig)
350 os_restarting_signal(sig, usr1_handler);
352 if (!process_log_path) return;
353 fd = log_open_as_exim(process_log_path);
355 /* If we are neither exim nor root, or if we failed to create the log file,
356 give up. There is not much useful we can do with errors, since we don't want
357 to disrupt whatever is going on outside the signal handler. */
361 (void)write(fd, process_info, process_info_len);
367 /*************************************************
369 *************************************************/
371 /* This handler is enabled most of the time that Exim is running. The handler
372 doesn't actually get used unless alarm() has been called to set a timer, to
373 place a time limit on a system call of some kind. When the handler is run, it
376 There are some other SIGALRM handlers that are used in special cases when more
377 than just a flag setting is required; for example, when reading a message's
378 input. These are normally set up in the code module that uses them, and the
379 SIGALRM handler is reset to this one afterwards.
381 Argument: the signal value (SIGALRM)
386 sigalrm_handler(int sig)
389 os_non_restarting_signal(SIGALRM, sigalrm_handler);
394 /*************************************************
395 * Sleep for a fractional time interval *
396 *************************************************/
398 /* This function is called by millisleep() and exim_wait_tick() to wait for a
399 period of time that may include a fraction of a second. The coding is somewhat
400 tedious. We do not expect setitimer() ever to fail, but if it does, the process
401 will wait for ever, so we panic in this instance. (There was a case of this
402 when a bug in a function that calls milliwait() caused it to pass invalid data.
403 That's when I added the check. :-)
405 We assume it to be not worth sleeping for under 50us; this value will
406 require revisiting as hardware advances. This avoids the issue of
407 a zero-valued timer setting meaning "never fire".
409 Argument: an itimerval structure containing the interval
414 milliwait(struct itimerval *itval)
417 sigset_t old_sigmask;
418 int save_errno = errno;
420 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
422 (void)sigemptyset(&sigmask); /* Empty mask */
423 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
424 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
425 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
426 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
427 "setitimer() failed: %s", strerror(errno));
428 (void)sigfillset(&sigmask); /* All signals */
429 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
430 (void)sigsuspend(&sigmask); /* Until SIGALRM */
431 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
433 sigalrm_seen = FALSE;
439 /*************************************************
440 * Millisecond sleep function *
441 *************************************************/
443 /* The basic sleep() function has a granularity of 1 second, which is too rough
444 in some cases - for example, when using an increasing delay to slow down
447 Argument: number of millseconds
454 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
455 .it_value = {.tv_sec = msec/1000,
456 .tv_usec = (msec % 1000) * 1000}};
462 /*************************************************
463 * Compare microsecond times *
464 *************************************************/
471 Returns: -1, 0, or +1
475 exim_tvcmp(struct timeval *t1, struct timeval *t2)
477 if (t1->tv_sec > t2->tv_sec) return +1;
478 if (t1->tv_sec < t2->tv_sec) return -1;
479 if (t1->tv_usec > t2->tv_usec) return +1;
480 if (t1->tv_usec < t2->tv_usec) return -1;
487 /*************************************************
488 * Clock tick wait function *
489 *************************************************/
491 #ifdef _POSIX_MONOTONIC_CLOCK
492 # ifdef CLOCK_BOOTTIME
493 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
495 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
498 /* Amount EXIM_CLOCK is behind realtime, at startup. */
499 static struct timespec offset_ts;
502 exim_clock_init(void)
505 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
506 (void)gettimeofday(&tv, NULL);
507 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
508 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
509 if (offset_ts.tv_nsec >= 0) return;
511 offset_ts.tv_nsec += 1000*1000*1000;
517 exim_gettime(struct timeval * tv)
519 #ifdef _POSIX_MONOTONIC_CLOCK
520 struct timespec now_ts;
522 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
524 now_ts.tv_sec += offset_ts.tv_sec;
525 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
528 now_ts.tv_nsec -= 1000*1000*1000;
530 tv->tv_sec = now_ts.tv_sec;
531 tv->tv_usec = now_ts.tv_nsec / 1000;
535 (void)gettimeofday(tv, NULL);
539 /* Exim uses a time + a pid to generate a unique identifier in two places: its
540 message IDs, and in file names for maildir deliveries. Because some OS now
541 re-use pids within the same second, sub-second times are now being used.
542 However, for absolute certainty, we must ensure the clock has ticked before
543 allowing the relevant process to complete. At the time of implementation of
544 this code (February 2003), the speed of processors is such that the clock will
545 invariably have ticked already by the time a process has done its job. This
546 function prepares for the time when things are faster - and it also copes with
547 clocks that go backwards.
550 prev_tv A timeval which was used to create uniqueness; its usec field
551 has been rounded down to the value of the resolution.
552 We want to be sure the current time is greater than this.
553 On return, updated to current (rounded down).
554 resolution The resolution that was used to divide the microseconds
555 (1 for maildir, larger for message ids)
561 exim_wait_tick(struct timeval * prev_tv, int resolution)
563 struct timeval now_tv;
564 long int now_true_usec;
566 exim_gettime(&now_tv);
567 now_true_usec = now_tv.tv_usec;
568 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
570 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
572 struct itimerval itval;
573 itval.it_interval.tv_sec = 0;
574 itval.it_interval.tv_usec = 0;
575 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
576 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
578 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
579 negative value for the microseconds is possible only in the case when "now"
580 is more than a second less than "tgt". That means that itval.it_value.tv_sec
581 is greater than zero. The following correction is therefore safe. */
583 if (itval.it_value.tv_usec < 0)
585 itval.it_value.tv_usec += 1000000;
586 itval.it_value.tv_sec -= 1;
589 DEBUG(D_transport|D_receive)
591 if (!f.running_in_test_harness)
593 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
594 prev_tv->tv_sec, (long) prev_tv->tv_usec,
595 now_tv.tv_sec, (long) now_tv.tv_usec);
596 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
597 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
603 /* Be prapared to go around if the kernel does not implement subtick
604 granularity (GNU Hurd) */
606 exim_gettime(&now_tv);
607 now_true_usec = now_tv.tv_usec;
608 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
616 /*************************************************
617 * Call fopen() with umask 777 and adjust mode *
618 *************************************************/
620 /* Exim runs with umask(0) so that files created with open() have the mode that
621 is specified in the open() call. However, there are some files, typically in
622 the spool directory, that are created with fopen(). They end up world-writeable
623 if no precautions are taken. Although the spool directory is not accessible to
624 the world, this is an untidiness. So this is a wrapper function for fopen()
625 that sorts out the mode of the created file.
628 filename the file name
629 options the fopen() options
630 mode the required mode
632 Returns: the fopened FILE or NULL
636 modefopen(const uschar *filename, const char *options, mode_t mode)
638 mode_t saved_umask = umask(0777);
639 FILE *f = Ufopen(filename, options);
640 (void)umask(saved_umask);
641 if (f != NULL) (void)fchmod(fileno(f), mode);
646 /*************************************************
647 * Ensure stdin, stdout, and stderr exist *
648 *************************************************/
650 /* Some operating systems grumble if an exec() happens without a standard
651 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
652 file will be opened and will use these fd values, and then some other bit of
653 code will assume, for example, that it can write error messages to stderr.
654 This function ensures that fds 0, 1, and 2 are open if they do not already
655 exist, by connecting them to /dev/null.
657 This function is also used to ensure that std{in,out,err} exist at all times,
658 so that if any library that Exim calls tries to use them, it doesn't crash.
669 for (int i = 0; i <= 2; i++)
671 if (fstat(i, &statbuf) < 0 && errno == EBADF)
673 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
674 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
675 string_open_failed("/dev/null", NULL));
676 if (devnull != i) (void)dup2(devnull, i);
679 if (devnull > 2) (void)close(devnull);
685 /*************************************************
686 * Close unwanted file descriptors for delivery *
687 *************************************************/
689 /* This function is called from a new process that has been forked to deliver
690 an incoming message, either directly, or using exec.
692 We want any smtp input streams to be closed in this new process. However, it
693 has been observed that using fclose() here causes trouble. When reading in -bS
694 input, duplicate copies of messages have been seen. The files will be sharing a
695 file pointer with the parent process, and it seems that fclose() (at least on
696 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
697 least sometimes. Hence we go for closing the underlying file descriptors.
699 If TLS is active, we want to shut down the TLS library, but without molesting
700 the parent's SSL connection.
702 For delivery of a non-SMTP message, we want to close stdin and stdout (and
703 stderr unless debugging) because the calling process might have set them up as
704 pipes and be waiting for them to close before it waits for the submission
705 process to terminate. If they aren't closed, they hold up the calling process
706 until the initial delivery process finishes, which is not what we want.
708 Exception: We do want it for synchronous delivery!
710 And notwithstanding all the above, if D_resolver is set, implying resolver
711 debugging, leave stdout open, because that's where the resolver writes its
714 When we close stderr (which implies we've also closed stdout), we also get rid
715 of any controlling terminal.
727 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
729 (void)close(fileno(smtp_in));
730 (void)close(fileno(smtp_out));
735 (void)close(0); /* stdin */
736 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
737 if (debug_selector == 0) /* stderr */
739 if (!f.synchronous_delivery)
752 /*************************************************
754 *************************************************/
756 /* This function sets a new uid and gid permanently, optionally calling
757 initgroups() to set auxiliary groups. There are some special cases when running
758 Exim in unprivileged modes. In these situations the effective uid will not be
759 root; if we already have the right effective uid/gid, and don't need to
760 initialize any groups, leave things as they are.
765 igflag TRUE if initgroups() wanted
766 msg text to use in debugging output and failure log
768 Returns: nothing; bombs out on failure
772 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
774 uid_t euid = geteuid();
775 gid_t egid = getegid();
777 if (euid == root_uid || euid != uid || egid != gid || igflag)
779 /* At least one OS returns +1 for initgroups failure, so just check for
784 struct passwd *pw = getpwuid(uid);
786 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
787 "no passwd entry for uid=%ld", (long int)uid);
789 if (initgroups(pw->pw_name, gid) != 0)
790 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
791 (long int)uid, strerror(errno));
794 if (setgid(gid) < 0 || setuid(uid) < 0)
795 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
796 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
799 /* Debugging output included uid/gid and all groups */
803 int group_count, save_errno;
804 gid_t group_list[EXIM_GROUPLIST_SIZE];
805 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
806 (long int)geteuid(), (long int)getegid(), (long int)getpid());
807 group_count = getgroups(nelem(group_list), group_list);
809 debug_printf(" auxiliary group list:");
811 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
812 else if (group_count < 0)
813 debug_printf(" <error: %s>", strerror(save_errno));
814 else debug_printf(" <none>");
822 /*************************************************
824 *************************************************/
826 /* Exim exits via this function so that it always clears up any open
832 Returns: does not return
841 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
842 ">>>>>>>>>>>>>>>>\n",
843 (int)getpid(), process_purpose, rc);
849 exim_underbar_exit(int rc)
853 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
854 ">>>>>>>>>>>>>>>>\n",
855 (int)getpid(), process_purpose, rc);
861 /* Print error string, then die */
863 exim_fail(const char * fmt, ...)
867 vfprintf(stderr, fmt, ap);
871 /* fail if a length is too long */
873 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
875 if (itemlen <= maxlen)
877 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
878 itemlen, maxlen, description);
882 /* only pass through the string item back to the caller if it's short enough */
883 static inline const uschar *
884 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
886 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
890 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
891 of chown()/fchown(). See src/functions.h for more explanation */
893 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
895 int saved_errno = errno; /* from the preceeding chown call */
897 log_write(0, LOG_MAIN|LOG_PANIC,
898 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
899 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
900 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
902 /* I leave this here, commented, in case the "bug"(?) comes up again.
903 It is not an Exim bug, but we can provide a workaround.
909 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
911 if (buf.st_uid == owner && buf.st_gid == group) return 0;
912 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
914 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
922 /*************************************************
923 * Extract port from host address *
924 *************************************************/
926 /* Called to extract the port from the values given to -oMa and -oMi.
927 It also checks the syntax of the address, and terminates it before the
928 port data when a port is extracted.
931 address the address, with possible port on the end
933 Returns: the port, or zero if there isn't one
934 bombs out on a syntax error
938 check_port(uschar *address)
940 int port = host_address_extract_port(address);
941 if (string_is_ip_address(address, NULL) == 0)
942 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
948 /*************************************************
949 * Test/verify an address *
950 *************************************************/
952 /* This function is called by the -bv and -bt code. It extracts a working
953 address from a full RFC 822 address. This isn't really necessary per se, but it
954 has the effect of collapsing source routes.
958 flags flag bits for verify_address()
959 exit_value to be set for failures
965 test_address(uschar *s, int flags, int *exit_value)
967 int start, end, domain;
968 uschar *parse_error = NULL;
969 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
973 fprintf(stdout, "syntax error: %s\n", parse_error);
978 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
979 -1, -1, NULL, NULL, NULL);
980 if (rc == FAIL) *exit_value = 2;
981 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
987 /*************************************************
988 * Show supported features *
989 *************************************************/
992 show_string(BOOL is_stdout, gstring * g)
994 const uschar * s = string_from_gstring(g);
996 if (is_stdout) fputs(CCS s, stdout);
997 else debug_printf("%s", s);
1002 show_db_version(gstring * g)
1004 #ifdef DB_VERSION_STRING
1007 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
1008 g = string_fmt_append(g, " Runtime: %s\n",
1009 db_version(NULL, NULL, NULL));
1012 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
1014 #elif defined(BTREEVERSION) && defined(HASHVERSION)
1016 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
1018 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
1021 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
1022 g = string_cat(g, US"Probably ndbm\n");
1023 #elif defined(USE_TDB)
1024 g = string_cat(g, US"Using tdb\n");
1027 g = string_cat(g, US"Probably GDBM (native mode)\n");
1029 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1036 /* This function is called for -bV/--version and for -d to output the optional
1037 features of the current Exim binary.
1039 Arguments: BOOL, true for stdout else debug channel
1044 show_whats_supported(BOOL is_stdout)
1046 rmark reset_point = store_mark();
1049 DEBUG(D_any) {} else g = show_db_version(g);
1051 g = string_cat(g, US"Support for:");
1052 #ifdef SUPPORT_CRYPTEQ
1053 g = string_cat(g, US" crypteq");
1056 g = string_cat(g, US" iconv()");
1059 g = string_cat(g, US" IPv6");
1061 #ifdef HAVE_SETCLASSRESOURCES
1062 g = string_cat(g, US" use_setclassresources");
1065 g = string_cat(g, US" PAM");
1068 g = string_cat(g, US" Perl");
1070 #ifdef EXPAND_DLFUNC
1071 g = string_cat(g, US" Expand_dlfunc");
1073 #ifdef USE_TCP_WRAPPERS
1074 g = string_cat(g, US" TCPwrappers");
1077 g = string_cat(g, US" GnuTLS");
1080 g = string_cat(g, US" OpenSSL");
1082 #ifndef DISABLE_TLS_RESUME
1083 g = string_cat(g, US" TLS_resume");
1085 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1086 g = string_cat(g, US" translate_ip_address");
1088 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1089 g = string_cat(g, US" move_frozen_messages");
1091 #ifdef WITH_CONTENT_SCAN
1092 g = string_cat(g, US" Content_Scanning");
1095 g = string_cat(g, US" DANE");
1097 #ifndef DISABLE_DKIM
1098 g = string_cat(g, US" DKIM");
1100 #ifdef SUPPORT_DMARC
1101 g = string_cat(g, US" DMARC");
1103 #ifndef DISABLE_DNSSEC
1104 g = string_cat(g, US" DNSSEC");
1106 #ifndef DISABLE_EVENT
1107 g = string_cat(g, US" Event");
1110 g = string_cat(g, US" I18N");
1112 #ifndef DISABLE_OCSP
1113 g = string_cat(g, US" OCSP");
1115 #ifndef DISABLE_PIPE_CONNECT
1116 g = string_cat(g, US" PIPECONNECT");
1118 #ifndef DISABLE_PRDR
1119 g = string_cat(g, US" PRDR");
1121 #ifdef SUPPORT_PROXY
1122 g = string_cat(g, US" PROXY");
1124 #ifndef DISABLE_QUEUE_RAMP
1125 g = string_cat(g, US" Queue_Ramp");
1127 #ifdef SUPPORT_SOCKS
1128 g = string_cat(g, US" SOCKS");
1131 g = string_cat(g, US" SPF");
1133 #if defined(SUPPORT_SRS)
1134 g = string_cat(g, US" SRS");
1138 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1140 #ifdef EXPERIMENTAL_ARC
1141 g = string_cat(g, US" Experimental_ARC");
1143 #ifdef EXPERIMENTAL_BRIGHTMAIL
1144 g = string_cat(g, US" Experimental_Brightmail");
1146 #ifdef EXPERIMENTAL_DCC
1147 g = string_cat(g, US" Experimental_DCC");
1149 #ifdef EXPERIMENTAL_DSN_INFO
1150 g = string_cat(g, US" Experimental_DSN_info");
1152 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1153 g = string_cat(g, US" Experimental_ESMTP_Limits");
1155 #ifdef EXPERIMENTAL_QUEUEFILE
1156 g = string_cat(g, US" Experimental_QUEUEFILE");
1158 g = string_cat(g, US"\n");
1160 g = string_cat(g, US"Lookups (built-in):");
1161 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1162 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1164 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1165 g = string_cat(g, US" cdb");
1167 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1168 g = string_cat(g, US" dbm dbmjz dbmnz");
1170 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1171 g = string_cat(g, US" dnsdb");
1173 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1174 g = string_cat(g, US" dsearch");
1176 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1177 g = string_cat(g, US" ibase");
1179 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1180 g = string_cat(g, US" json");
1182 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1183 g = string_cat(g, US" ldap ldapdn ldapm");
1186 g = string_cat(g, US" lmdb");
1188 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1189 g = string_cat(g, US" mysql");
1191 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1192 g = string_cat(g, US" nis nis0");
1194 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1195 g = string_cat(g, US" nisplus");
1197 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1198 g = string_cat(g, US" oracle");
1200 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1201 g = string_cat(g, US" passwd");
1203 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1204 g = string_cat(g, US" pgsql");
1206 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1207 g = string_cat(g, US" redis");
1209 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1210 g = string_cat(g, US" sqlite");
1212 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1213 g = string_cat(g, US" testdb");
1215 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1216 g = string_cat(g, US" whoson");
1218 g = string_cat(g, US"\n");
1220 g = auth_show_supported(g);
1221 g = route_show_supported(g);
1222 g = transport_show_supported(g);
1224 #ifdef WITH_CONTENT_SCAN
1225 g = malware_show_supported(g);
1227 show_string(is_stdout, g); g = NULL;
1229 if (fixed_never_users[0] > 0)
1232 g = string_cat(g, US"Fixed never_users: ");
1233 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1234 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1235 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1238 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1240 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1242 /* Everything else is details which are only worth reporting when debugging.
1243 Perhaps the tls_version_report should move into this too. */
1247 /* clang defines __GNUC__ (at least, for me) so test for it first */
1248 #if defined(__clang__)
1249 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1250 #elif defined(__GNUC__)
1251 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1255 "? unknown version ?"
1259 g = string_cat(g, US"Compiler: <unknown>\n");
1262 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1263 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1264 __GLIBC__, __GLIBC_MINOR__);
1265 if (__GLIBC_PREREQ(2, 1))
1266 g = string_fmt_append(g, " Runtime: %s\n",
1267 gnu_get_libc_version());
1270 g = show_db_version(g);
1273 g = tls_version_report(g);
1276 g = utf8_version_report(g);
1278 #ifdef SUPPORT_DMARC
1279 g = dmarc_version_report(g);
1282 g = spf_lib_version_report(g);
1285 show_string(is_stdout, g);
1288 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1289 if (authi->version_report)
1290 g = (*authi->version_report)(g);
1292 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1293 characters; unless it's an ancient version of PCRE in which case it
1295 #ifndef PCRE_PRERELEASE
1296 # define PCRE_PRERELEASE
1299 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1302 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1303 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1305 PCRE2_MAJOR, PCRE2_MINOR,
1306 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1310 #undef EXPAND_AND_QUOTE
1312 show_string(is_stdout, g);
1316 for (int i = 0; i < lookup_list_count; i++)
1317 if (lookup_list[i]->version_report)
1318 g = lookup_list[i]->version_report(g);
1319 show_string(is_stdout, g);
1322 #ifdef WHITELIST_D_MACROS
1323 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1325 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1327 #ifdef TRUSTED_CONFIG_LIST
1328 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1330 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1334 show_string(is_stdout, g);
1335 store_reset(reset_point);
1339 /*************************************************
1340 * Show auxiliary information about Exim *
1341 *************************************************/
1344 show_exim_information(enum commandline_info request, FILE *stream)
1349 fprintf(stream, "Oops, something went wrong.\n");
1353 "The -bI: flag takes a string indicating which information to provide.\n"
1354 "If the string is not recognised, you'll get this help (on stderr).\n"
1356 " exim -bI:help this information\n"
1357 " exim -bI:dscp list of known dscp value keywords\n"
1358 " exim -bI:sieve list of supported sieve extensions\n"
1362 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1363 fprintf(stream, "%s\n", *pp);
1366 dscp_list_to_stream(stream);
1372 /*************************************************
1373 * Quote a local part *
1374 *************************************************/
1376 /* This function is used when a sender address or a From: or Sender: header
1377 line is being created from the caller's login, or from an authenticated_id. It
1378 applies appropriate quoting rules for a local part.
1380 Argument: the local part
1381 Returns: the local part, quoted if necessary
1385 local_part_quote(uschar *lpart)
1387 BOOL needs_quote = FALSE;
1390 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1392 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1393 (*t != '.' || t == lpart || t[1] == 0);
1396 if (!needs_quote) return lpart;
1398 g = string_catn(NULL, US"\"", 1);
1402 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1405 g = string_cat(g, lpart);
1408 g = string_catn(g, lpart, nq - lpart);
1409 g = string_catn(g, US"\\", 1);
1410 g = string_catn(g, nq, 1);
1414 g = string_catn(g, US"\"", 1);
1415 return string_from_gstring(g);
1421 /*************************************************
1422 * Load readline() functions *
1423 *************************************************/
1425 /* This function is called from testing executions that read data from stdin,
1426 but only when running as the calling user. Currently, only -be does this. The
1427 function loads the readline() function library and passes back the functions.
1428 On some systems, it needs the curses library, so load that too, but try without
1429 it if loading fails. All this functionality has to be requested at build time.
1432 fn_readline_ptr pointer to where to put the readline pointer
1433 fn_addhist_ptr pointer to where to put the addhistory function
1435 Returns: the dlopen handle or NULL on failure
1439 set_readline(char * (**fn_readline_ptr)(const char *),
1440 void (**fn_addhist_ptr)(const char *))
1443 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1445 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1446 if (dlhandle_curses) dlclose(dlhandle_curses);
1450 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1451 * char * readline (const char *prompt);
1452 * void add_history (const char *string);
1454 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1455 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1458 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1466 /*************************************************
1467 * Get a line from stdin for testing things *
1468 *************************************************/
1470 /* This function is called when running tests that can take a number of lines
1471 of input (for example, -be and -bt). It handles continuations and trailing
1472 spaces. And prompting and a blank line output on eof. If readline() is in use,
1473 the arguments are non-NULL and provide the relevant functions.
1476 fn_readline readline function or NULL
1477 fn_addhist addhist function or NULL
1479 Returns: pointer to dynamic memory, or NULL at end of file
1483 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1486 BOOL had_input = FALSE;
1488 if (!fn_readline) { printf("> "); fflush(stdout); }
1490 for (int i = 0;; i++)
1492 uschar buffer[1024];
1496 char *readline_line = NULL;
1499 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1500 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1501 p = US readline_line;
1506 /* readline() not in use */
1509 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1513 /* Handle the line */
1516 ss = p + Ustrlen(p);
1517 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1520 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1522 g = string_catn(g, p, ss - p);
1525 if (fn_readline) free(readline_line);
1528 /* g can only be NULL if ss==p */
1529 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1532 --g->ptr; /* drop the \ */
1535 if (had_input) return g ? string_from_gstring(g) : US"";
1542 /*************************************************
1543 * Output usage information for the program *
1544 *************************************************/
1546 /* This function is called when there are no recipients
1547 or a specific --help argument was added.
1550 progname information on what name we were called by
1552 Returns: DOES NOT RETURN
1556 exim_usage(uschar *progname)
1559 /* Handle specific program invocation variants */
1560 if (Ustrcmp(progname, US"-mailq") == 0)
1562 "mailq - list the contents of the mail queue\n\n"
1563 "For a list of options, see the Exim documentation.\n");
1565 /* Generic usage - we output this whatever happens */
1567 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1568 "not directly from a shell command line. Options and/or arguments control\n"
1569 "what it does when called. For a list of options, see the Exim documentation.\n");
1574 /*************************************************
1575 * Validate that the macros given are okay *
1576 *************************************************/
1578 /* Typically, Exim will drop privileges if macros are supplied. In some
1579 cases, we want to not do so.
1581 Arguments: opt_D_used - true if the commandline had a "-D" option
1582 Returns: true if trusted, false otherwise
1586 macros_trusted(BOOL opt_D_used)
1588 #ifdef WHITELIST_D_MACROS
1589 uschar *whitelisted, *end, *p, **whites;
1590 int white_count, i, n;
1592 BOOL prev_char_item, found;
1597 #ifndef WHITELIST_D_MACROS
1601 /* We only trust -D overrides for some invoking users:
1602 root, the exim run-time user, the optional config owner user.
1603 I don't know why config-owner would be needed, but since they can own the
1604 config files anyway, there's no security risk to letting them override -D. */
1605 if ( ! ((real_uid == root_uid)
1606 || (real_uid == exim_uid)
1607 #ifdef CONFIGURE_OWNER
1608 || (real_uid == config_uid)
1612 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1616 /* Get a list of macros which are whitelisted */
1617 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1618 prev_char_item = FALSE;
1620 for (p = whitelisted; *p != '\0'; ++p)
1622 if (*p == ':' || isspace(*p))
1627 prev_char_item = FALSE;
1630 if (!prev_char_item)
1631 prev_char_item = TRUE;
1638 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1639 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1644 if (i == white_count)
1646 while (*p != '\0' && p < end)
1652 /* The list of commandline macros should be very short.
1653 Accept the N*M complexity. */
1654 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1657 for (uschar ** w = whites; *w; ++w)
1658 if (Ustrcmp(*w, m->name) == 0)
1665 if (!m->replacement)
1667 if ((len = m->replen) == 0)
1669 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1672 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1678 /*************************************************
1679 * Expansion testing *
1680 *************************************************/
1682 /* Expand and print one item, doing macro-processing.
1685 item line for expansion
1689 expansion_test_line(const uschar * line)
1695 Ustrncpy(big_buffer, line, big_buffer_size);
1696 big_buffer[big_buffer_size-1] = '\0';
1697 len = Ustrlen(big_buffer);
1699 (void) macros_expand(0, &len, &dummy_macexp);
1701 if (isupper(big_buffer[0]))
1703 if (macro_read_assignment(big_buffer))
1704 printf("Defined macro '%s'\n", mlast->name);
1707 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1708 else printf("Failed: %s\n", expand_string_message);
1713 /*************************************************
1714 * Entry point and high-level code *
1715 *************************************************/
1717 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1718 the appropriate action. All the necessary functions are present in the one
1719 binary. I originally thought one should split it up, but it turns out that so
1720 much of the apparatus is needed in each chunk that one might as well just have
1721 it all available all the time, which then makes the coding easier as well.
1724 argc count of entries in argv
1725 argv argument strings, with argv[0] being the program name
1727 Returns: EXIT_SUCCESS if terminated successfully
1728 EXIT_FAILURE otherwise, except when a message has been sent
1729 to the sender, and -oee was given
1733 main(int argc, char **cargv)
1735 uschar **argv = USS cargv;
1736 int arg_receive_timeout = -1;
1737 int arg_smtp_receive_timeout = -1;
1738 int arg_error_handling = error_handling;
1739 int filter_sfd = -1;
1740 int filter_ufd = -1;
1743 int list_queue_option = 0;
1745 int msg_action_arg = -1;
1746 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1747 int queue_only_reason = 0;
1749 int perl_start_option = 0;
1751 int recipients_arg = argc;
1752 int sender_address_domain = 0;
1753 int test_retry_arg = -1;
1754 int test_rewrite_arg = -1;
1755 gid_t original_egid;
1756 BOOL arg_queue_only = FALSE;
1757 BOOL bi_option = FALSE;
1758 BOOL checking = FALSE;
1759 BOOL count_queue = FALSE;
1760 BOOL expansion_test = FALSE;
1761 BOOL extract_recipients = FALSE;
1762 BOOL flag_G = FALSE;
1763 BOOL flag_n = FALSE;
1764 BOOL forced_delivery = FALSE;
1765 BOOL f_end_dot = FALSE;
1766 BOOL deliver_give_up = FALSE;
1767 BOOL list_queue = FALSE;
1768 BOOL list_options = FALSE;
1769 BOOL list_config = FALSE;
1770 BOOL local_queue_only;
1771 BOOL one_msg_action = FALSE;
1772 BOOL opt_D_used = FALSE;
1773 BOOL queue_only_set = FALSE;
1774 BOOL receiving_message = TRUE;
1775 BOOL sender_ident_set = FALSE;
1776 BOOL session_local_queue_only;
1778 BOOL removed_privilege = FALSE;
1779 BOOL usage_wanted = FALSE;
1780 BOOL verify_address_mode = FALSE;
1781 BOOL verify_as_sender = FALSE;
1782 BOOL rcpt_verify_quota = FALSE;
1783 BOOL version_printed = FALSE;
1784 uschar *alias_arg = NULL;
1785 uschar *called_as = US"";
1786 uschar *cmdline_syslog_name = NULL;
1787 uschar *start_queue_run_id = NULL;
1788 uschar *stop_queue_run_id = NULL;
1789 uschar *expansion_test_message = NULL;
1790 const uschar *ftest_domain = NULL;
1791 const uschar *ftest_localpart = NULL;
1792 const uschar *ftest_prefix = NULL;
1793 const uschar *ftest_suffix = NULL;
1794 uschar *log_oneline = NULL;
1795 uschar *malware_test_file = NULL;
1796 uschar *real_sender_address;
1797 uschar *originator_home = US"/";
1801 struct stat statbuf;
1802 pid_t passed_qr_pid = (pid_t)0;
1803 int passed_qr_pipe = -1;
1804 gid_t group_list[EXIM_GROUPLIST_SIZE];
1806 /* For the -bI: flag */
1807 enum commandline_info info_flag = CMDINFO_NONE;
1808 BOOL info_stdout = FALSE;
1810 /* Possible options for -R and -S */
1812 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1814 /* Need to define this in case we need to change the environment in order
1815 to get rid of a bogus time zone. We have to make it char rather than uschar
1816 because some OS define it in /usr/include/unistd.h. */
1818 extern char **environ;
1820 #ifdef MEASURE_TIMING
1821 (void)gettimeofday(×tamp_startup, NULL);
1824 store_init(); /* Initialise the memory allocation susbsystem */
1825 pcre_init(); /* Set up memory handling for pcre */
1827 /* If the Exim user and/or group and/or the configuration file owner/group were
1828 defined by ref:name at build time, we must now find the actual uid/gid values.
1829 This is a feature to make the lives of binary distributors easier. */
1831 #ifdef EXIM_USERNAME
1832 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1835 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1837 /* If ref:name uses a number as the name, route_finduser() returns
1838 TRUE with exim_uid set and pw coerced to NULL. */
1840 exim_gid = pw->pw_gid;
1841 #ifndef EXIM_GROUPNAME
1844 "exim: ref:name should specify a usercode, not a group.\n"
1845 "exim: can't let you get away with it unless you also specify a group.\n");
1849 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1852 #ifdef EXIM_GROUPNAME
1853 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1854 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1857 #ifdef CONFIGURE_OWNERNAME
1858 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1859 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1860 CONFIGURE_OWNERNAME);
1863 /* We default the system_filter_user to be the Exim run-time user, as a
1864 sane non-root value. */
1865 system_filter_uid = exim_uid;
1867 #ifdef CONFIGURE_GROUPNAME
1868 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1869 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1870 CONFIGURE_GROUPNAME);
1873 /* In the Cygwin environment, some initialization used to need doing.
1874 It was fudged in by means of this macro; now no longer but we'll leave
1875 it in case of others. */
1881 /* Check a field which is patched when we are running Exim within its
1882 testing harness; do a fast initial check, and then the whole thing. */
1884 f.running_in_test_harness =
1885 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1886 if (f.running_in_test_harness)
1889 /* Protect against abusive argv[0] */
1890 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1891 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1893 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1894 at the start of a program; however, it seems that some environments do not
1895 follow this. A "strange" locale can affect the formatting of timestamps, so we
1898 setlocale(LC_ALL, "C");
1900 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1902 #ifdef _POSIX_MONOTONIC_CLOCK
1906 /* Set up the default handler for timing using alarm(). */
1908 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1910 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1911 because store_malloc writes a log entry on failure. */
1913 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1914 exim_fail("exim: failed to get store for log buffer\n");
1916 /* Initialize the default log options. */
1918 bits_set(log_selector, log_selector_size, log_default);
1920 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1921 NULL when the daemon is run and the file is closed. We have to use this
1922 indirection, because some systems don't allow writing to the variable "stderr".
1925 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1927 /* Ensure there is a big buffer for temporary use in several places. It is put
1928 in malloc store so that it can be freed for enlargement if necessary. */
1930 big_buffer = store_malloc(big_buffer_size);
1932 /* Set up the handler for the data request signal, and set the initial
1933 descriptive text. */
1935 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1936 set_process_info("initializing");
1937 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1940 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1941 sigaction(SIGSEGV, &act, NULL);
1944 signal(SIGSEGV, segv_handler); /* log faults */
1947 /* If running in a dockerized environment, the TERM signal is only
1948 delegated to the PID 1 if we request it by setting an signal handler */
1949 if (getpid() == 1) signal(SIGTERM, term_handler);
1951 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1952 in the daemon code. For the rest of Exim's uses, we ignore it. */
1954 signal(SIGHUP, SIG_IGN);
1956 /* We don't want to die on pipe errors as the code is written to handle
1957 the write error instead. */
1959 signal(SIGPIPE, SIG_IGN);
1961 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1962 set to SIG_IGN. This causes subprocesses that complete before the parent
1963 process waits for them not to hang around, so when Exim calls wait(), nothing
1964 is there. The wait() code has been made robust against this, but let's ensure
1965 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1966 ending status. We use sigaction rather than plain signal() on those OS where
1967 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1968 problem on AIX with this.) */
1972 struct sigaction act;
1973 act.sa_handler = SIG_DFL;
1974 sigemptyset(&(act.sa_mask));
1976 sigaction(SIGCHLD, &act, NULL);
1979 signal(SIGCHLD, SIG_DFL);
1982 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1987 /* Set up the version number. Set up the leading 'E' for the external form of
1988 message ids, set the pointer to the internal form, and initialize it to
1989 indicate no message being processed. */
1992 message_id_option[0] = '-';
1993 message_id_external = message_id_option + 1;
1994 message_id_external[0] = 'E';
1995 message_id = message_id_external + 1;
1998 /* Set the umask to zero so that any files Exim creates using open() are
1999 created with the modes that it specifies. NOTE: Files created with fopen() have
2000 a problem, which was not recognized till rather late (February 2006). With this
2001 umask, such files will be world writeable. (They are all content scanning files
2002 in the spool directory, which isn't world-accessible, so this is not a
2003 disaster, but it's untidy.) I don't want to change this overall setting,
2004 however, because it will interact badly with the open() calls. Instead, there's
2005 now a function called modefopen() that fiddles with the umask while calling
2010 /* Precompile the regular expression for matching a message id. Keep this in
2011 step with the code that generates ids in the accept.c module. We need to do
2012 this here, because the -M options check their arguments for syntactic validity
2013 using mac_ismsgid, which uses this. */
2016 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
2018 /* Precompile the regular expression that is used for matching an SMTP error
2019 code, possibly extended, at the start of an error message. Note that the
2020 terminating whitespace character is included. */
2023 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2026 #ifdef WHITELIST_D_MACROS
2027 /* Precompile the regular expression used to filter the content of macros
2028 given to -D for permissibility. */
2030 regex_whitelisted_macro =
2031 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
2034 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
2036 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2037 this seems to be a generally accepted convention, since one finds symbolic
2038 links called "mailq" in standard OS configurations. */
2040 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2041 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2044 receiving_message = FALSE;
2045 called_as = US"-mailq";
2048 /* If the program is called as "rmail" treat it as equivalent to
2049 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2050 i.e. preventing a single dot on a line from terminating the message, and
2051 returning with zero return code, even in cases of error (provided an error
2052 message has been sent). */
2054 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2055 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2058 called_as = US"-rmail";
2059 errors_sender_rc = EXIT_SUCCESS;
2062 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2063 this is a smail convention. */
2065 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2066 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2068 smtp_input = smtp_batched_input = TRUE;
2069 called_as = US"-rsmtp";
2072 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2073 this is a smail convention. */
2075 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2076 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2079 receiving_message = FALSE;
2080 called_as = US"-runq";
2083 /* If the program is called as "newaliases" treat it as equivalent to
2084 "exim -bi"; this is a sendmail convention. */
2086 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2087 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2090 receiving_message = FALSE;
2091 called_as = US"-newaliases";
2094 /* Save the original effective uid for a couple of uses later. It should
2095 normally be root, but in some esoteric environments it may not be. */
2097 original_euid = geteuid();
2098 original_egid = getegid();
2100 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2101 to be the same as the real ones. This makes a difference only if Exim is setuid
2102 (or setgid) to something other than root, which could be the case in some
2103 special configurations. */
2105 real_uid = getuid();
2106 real_gid = getgid();
2108 if (real_uid == root_uid)
2110 if ((rv = setgid(real_gid)))
2111 exim_fail("exim: setgid(%ld) failed: %s\n",
2112 (long int)real_gid, strerror(errno));
2113 if ((rv = setuid(real_uid)))
2114 exim_fail("exim: setuid(%ld) failed: %s\n",
2115 (long int)real_uid, strerror(errno));
2118 /* If neither the original real uid nor the original euid was root, Exim is
2119 running in an unprivileged state. */
2121 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2123 /* For most of the args-parsing we need to use permanent pool memory */
2125 int old_pool = store_pool;
2126 store_pool = POOL_PERM;
2128 /* Scan the program's arguments. Some can be dealt with right away; others are
2129 simply recorded for checking and handling afterwards. Do a high-level switch
2130 on the second character (the one after '-'), to save some effort. */
2132 for (i = 1; i < argc; i++)
2134 BOOL badarg = FALSE;
2135 uschar * arg = argv[i];
2139 /* An argument not starting with '-' is the start of a recipients list;
2140 break out of the options-scanning loop. */
2148 /* An option consisting of -- terminates the options */
2150 if (Ustrcmp(arg, "--") == 0)
2152 recipients_arg = i + 1;
2156 /* Handle flagged options */
2158 switchchar = arg[1];
2161 /* Make all -ex options synonymous with -oex arguments, since that
2162 is assumed by various callers. Also make -qR options synonymous with -R
2163 options, as that seems to be required as well. Allow for -qqR too, and
2164 the same for -S options. */
2166 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2167 Ustrncmp(arg+1, "qR", 2) == 0 ||
2168 Ustrncmp(arg+1, "qS", 2) == 0)
2170 switchchar = arg[2];
2173 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2175 switchchar = arg[3];
2177 f.queue_2stage = TRUE;
2180 /* Make -r synonymous with -f, since it is a documented alias */
2182 else if (arg[1] == 'r') switchchar = 'f';
2184 /* Make -ov synonymous with -v */
2186 else if (Ustrcmp(arg, "-ov") == 0)
2192 /* deal with --option_aliases */
2193 else if (switchchar == '-')
2195 if (Ustrcmp(argrest, "help") == 0)
2197 usage_wanted = TRUE;
2200 else if (Ustrcmp(argrest, "version") == 0)
2207 /* High-level switch on active initial letter */
2212 /* sendmail uses -Ac and -Am to control which .cf file is used;
2215 if (!*argrest) { badarg = TRUE; break; }
2218 BOOL ignore = FALSE;
2223 if (*(argrest + 1) == '\0')
2227 if (!ignore) badarg = TRUE;
2231 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2232 so has no need of it. */
2235 if (!*argrest) i++; /* Skip over the type */
2241 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2245 /* -bd: Run in daemon mode, awaiting SMTP connections.
2246 -bdf: Ditto, but in the foreground.
2249 f.daemon_listen = TRUE;
2250 if (*argrest == 'f') f.background_daemon = FALSE;
2251 else if (*argrest) badarg = TRUE;
2254 /* -be: Run in expansion test mode
2255 -bem: Ditto, but read a message from a file first
2258 expansion_test = checking = TRUE;
2259 if (*argrest == 'm')
2261 if (++i >= argc) { badarg = TRUE; break; }
2262 expansion_test_message = argv[i];
2265 if (*argrest) badarg = TRUE;
2268 /* -bF: Run system filter test */
2270 filter_test |= checking = FTEST_SYSTEM;
2271 if (*argrest) badarg = TRUE;
2272 else if (++i < argc) filter_test_sfile = argv[i];
2273 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2276 /* -bf: Run user filter test
2277 -bfd: Set domain for filter testing
2278 -bfl: Set local part for filter testing
2279 -bfp: Set prefix for filter testing
2280 -bfs: Set suffix for filter testing
2285 filter_test |= checking = FTEST_USER;
2286 if (++i < argc) filter_test_ufile = argv[i];
2287 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2292 exim_fail("exim: string expected after %s\n", arg);
2293 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2294 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2295 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2296 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2301 /* -bh: Host checking - an IP address must follow. */
2303 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2305 if (++i >= argc) { badarg = TRUE; break; }
2306 sender_host_address = string_copy_taint(
2307 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2309 host_checking = checking = f.log_testing_mode = TRUE;
2310 f.host_checking_callout = *argrest == 'c';
2311 message_logs = FALSE;
2316 /* -bi: This option is used by sendmail to initialize *the* alias file,
2317 though it has the -oA option to specify a different file. Exim has no
2318 concept of *the* alias file, but since Sun's YP make script calls
2319 sendmail this way, some support must be provided. */
2321 if (!*argrest) bi_option = TRUE;
2325 /* -bI: provide information, of the type to follow after a colon.
2326 This is an Exim flag. */
2328 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2330 uschar *p = argrest+1;
2331 info_flag = CMDINFO_HELP;
2333 if (strcmpic(p, CUS"sieve") == 0)
2335 info_flag = CMDINFO_SIEVE;
2338 else if (strcmpic(p, CUS"dscp") == 0)
2340 info_flag = CMDINFO_DSCP;
2343 else if (strcmpic(p, CUS"help") == 0)
2349 /* -bm: Accept and deliver message - the default option. Reinstate
2350 receiving_message, which got turned off for all -b options.
2351 -bmalware: test the filename given for malware */
2353 if (!*argrest) receiving_message = TRUE;
2354 else if (Ustrcmp(argrest, "alware") == 0)
2356 if (++i >= argc) { badarg = TRUE; break; }
2358 malware_test_file = argv[i];
2363 /* -bnq: For locally originating messages, do not qualify unqualified
2364 addresses. In the envelope, this causes errors; in header lines they
2367 if (Ustrcmp(argrest, "q") == 0)
2369 f.allow_unqualified_sender = FALSE;
2370 f.allow_unqualified_recipient = FALSE;
2375 /* -bpxx: List the contents of the mail queue, in various forms. If
2376 the option is -bpc, just a queue count is needed. Otherwise, if the
2377 first letter after p is r, then order is random. */
2379 if (*argrest == 'c')
2382 if (*++argrest) badarg = TRUE;
2386 if (*argrest == 'r')
2388 list_queue_option = 8;
2391 else list_queue_option = 0;
2395 /* -bp: List the contents of the mail queue, top-level only */
2399 /* -bpu: List the contents of the mail queue, top-level undelivered */
2401 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2403 /* -bpa: List the contents of the mail queue, including all delivered */
2405 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2407 /* Unknown after -bp[r] */
2413 /* -bP: List the configuration variables given as the address list.
2414 Force -v, so configuration errors get displayed. */
2417 /* -bP config: we need to setup here, because later,
2418 when list_options is checked, the config is read already */
2421 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2424 readconf_save_config(version_string);
2428 list_options = TRUE;
2429 debug_selector |= D_v;
2430 debug_file = stderr;
2434 /* -brt: Test retry configuration lookup */
2436 if (Ustrcmp(argrest, "t") == 0)
2439 test_retry_arg = i + 1;
2443 /* -brw: Test rewrite configuration */
2445 else if (Ustrcmp(argrest, "w") == 0)
2448 test_rewrite_arg = i + 1;
2454 /* -bS: Read SMTP commands on standard input, but produce no replies -
2455 all errors are reported by sending messages. */
2458 smtp_input = smtp_batched_input = receiving_message = TRUE;
2462 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2463 on standard output. */
2465 if (!*argrest) smtp_input = receiving_message = TRUE;
2469 /* -bt: address testing mode */
2472 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2476 /* -bv: verify addresses */
2479 verify_address_mode = checking = f.log_testing_mode = TRUE;
2481 /* -bvs: verify sender addresses */
2483 else if (Ustrcmp(argrest, "s") == 0)
2485 verify_address_mode = checking = f.log_testing_mode = TRUE;
2486 verify_as_sender = TRUE;
2491 /* -bV: Print version string and support details */
2495 printf("Exim version %s #%s built %s\n", version_string,
2496 version_cnumber, version_date);
2497 printf("%s\n", CS version_copyright);
2498 version_printed = TRUE;
2499 show_whats_supported(TRUE);
2500 f.log_testing_mode = TRUE;
2505 /* -bw: inetd wait mode, accept a listening socket as stdin */
2507 f.inetd_wait_mode = TRUE;
2508 f.background_daemon = FALSE;
2509 f.daemon_listen = TRUE;
2511 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2512 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2523 /* -C: change configuration file list; ignore if it isn't really
2524 a change! Enforce a prefix check if required. */
2528 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2529 if (Ustrcmp(config_main_filelist, argrest) != 0)
2531 #ifdef ALT_CONFIG_PREFIX
2533 int len = Ustrlen(ALT_CONFIG_PREFIX);
2534 const uschar *list = argrest;
2536 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2537 while((filename = string_nextinlist(&list, &sep, big_buffer,
2539 if ( ( Ustrlen(filename) < len
2540 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2541 || Ustrstr(filename, "/../") != NULL
2543 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2545 exim_fail("-C Permission denied\n");
2547 if (real_uid != root_uid)
2549 #ifdef TRUSTED_CONFIG_LIST
2551 if (real_uid != exim_uid
2552 #ifdef CONFIGURE_OWNER
2553 && real_uid != config_uid
2556 f.trusted_config = FALSE;
2559 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2562 struct stat statbuf;
2564 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2565 (statbuf.st_uid != root_uid /* owner not root */
2566 #ifdef CONFIGURE_OWNER
2567 && statbuf.st_uid != config_uid /* owner not the special one */
2570 (statbuf.st_gid != root_gid /* group not root */
2571 #ifdef CONFIGURE_GROUP
2572 && statbuf.st_gid != config_gid /* group not the special one */
2574 && (statbuf.st_mode & 020) != 0 /* group writeable */
2576 (statbuf.st_mode & 2) != 0) /* world writeable */
2578 f.trusted_config = FALSE;
2583 /* Well, the trust list at least is up to scratch... */
2585 uschar *trusted_configs[32];
2588 int old_pool = store_pool;
2589 store_pool = POOL_MAIN;
2591 reset_point = store_mark();
2592 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2594 uschar *start = big_buffer, *nl;
2595 while (*start && isspace(*start))
2599 nl = Ustrchr(start, '\n');
2602 trusted_configs[nr_configs++] = string_copy(start);
2603 if (nr_configs == nelem(trusted_configs))
2611 const uschar *list = argrest;
2613 while (f.trusted_config && (filename = string_nextinlist(&list,
2614 &sep, big_buffer, big_buffer_size)))
2616 for (i=0; i < nr_configs; i++)
2617 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2619 if (i == nr_configs)
2621 f.trusted_config = FALSE;
2626 else /* No valid prefixes found in trust_list file. */
2627 f.trusted_config = FALSE;
2628 store_reset(reset_point);
2629 store_pool = old_pool;
2632 else /* Could not open trust_list file. */
2633 f.trusted_config = FALSE;
2636 /* Not root; don't trust config */
2637 f.trusted_config = FALSE;
2641 config_main_filelist = argrest;
2642 f.config_changed = TRUE;
2647 /* -D: set up a macro definition */
2650 #ifdef DISABLE_D_OPTION
2651 exim_fail("exim: -D is not available in this Exim binary\n");
2657 uschar *s = argrest;
2660 while (isspace(*s)) s++;
2662 if (*s < 'A' || *s > 'Z')
2663 exim_fail("exim: macro name set by -D must start with "
2664 "an upper case letter\n");
2666 while (isalnum(*s) || *s == '_')
2668 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2672 if (ptr == 0) { badarg = TRUE; break; }
2673 while (isspace(*s)) s++;
2676 if (*s++ != '=') { badarg = TRUE; break; }
2677 while (isspace(*s)) s++;
2680 for (m = macros_user; m; m = m->next)
2681 if (Ustrcmp(m->name, name) == 0)
2682 exim_fail("exim: duplicated -D in command line\n");
2684 m = macro_create(name, s, TRUE);
2686 if (clmacro_count >= MAX_CLMACROS)
2687 exim_fail("exim: too many -D options on command line\n");
2688 clmacros[clmacro_count++] =
2689 string_sprintf("-D%s=%s", m->name, m->replacement);
2696 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2698 if (Ustrcmp(argrest, "ropcr") == 0)
2700 /* drop_cr = TRUE; */
2703 /* -dp: Set up a debug pretrigger buffer with given size. */
2705 else if (Ustrcmp(argrest, "p") == 0)
2709 debug_pretrigger_setup(argv[i]);
2711 /* -dt: Set a debug trigger selector */
2713 else if (Ustrncmp(argrest, "t=", 2) == 0)
2714 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2716 /* -d: Set debug level (see also -v below).
2717 If -dd is used, debugging subprocesses of the daemon is disabled. */
2721 /* Use an intermediate variable so that we don't set debugging while
2722 decoding the debugging bits. */
2724 unsigned int selector = D_default;
2727 if (*argrest == 'd')
2729 f.debug_daemon = TRUE;
2733 decode_bits(&selector, 1, debug_notall, argrest,
2734 debug_options, debug_options_count, US"debug", 0);
2735 debug_selector = selector;
2740 /* -E: This is a local error message. This option is not intended for
2741 external use at all, but is not restricted to trusted callers because it
2742 does no harm (just suppresses certain error messages) and if Exim is run
2743 not setuid root it won't always be trusted when it generates error
2744 messages using this option. If there is a message id following -E, point
2745 message_reference at it, for logging. */
2748 f.local_error_message = TRUE;
2749 if (mac_ismsgid(argrest)) message_reference = argrest;
2753 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2754 option, so it looks as if historically the -oex options are also callable
2755 without the leading -o. So we have to accept them. Before the switch,
2756 anything starting -oe has been converted to -e. Exim does not support all
2757 of the sendmail error options. */
2760 if (Ustrcmp(argrest, "e") == 0)
2762 arg_error_handling = ERRORS_SENDER;
2763 errors_sender_rc = EXIT_SUCCESS;
2765 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2766 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2767 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2768 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2773 /* -F: Set sender's full name, used instead of the gecos entry from
2774 the password file. Since users can usually alter their gecos entries,
2775 there's no security involved in using this instead. The data can follow
2776 the -F or be in the next argument. */
2780 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2781 originator_name = string_copy_taint(
2782 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2784 f.sender_name_forced = TRUE;
2788 /* -f: Set sender's address - this value is only actually used if Exim is
2789 run by a trusted user, or if untrusted_set_sender is set and matches the
2790 address, except that the null address can always be set by any user. The
2791 test for this happens later, when the value given here is ignored when not
2792 permitted. For an untrusted user, the actual sender is still put in Sender:
2793 if it doesn't match the From: header (unless no_local_from_check is set).
2794 The data can follow the -f or be in the next argument. The -r switch is an
2795 obsolete form of -f but since there appear to be programs out there that
2796 use anything that sendmail has ever supported, better accept it - the
2797 synonymizing is done before the switch above.
2799 At this stage, we must allow domain literal addresses, because we don't
2800 know what the setting of allow_domain_literals is yet. Ditto for trailing
2801 dots and strip_trailing_dot. */
2805 int dummy_start, dummy_end;
2808 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2809 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2811 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2814 uschar * temp = argrest + Ustrlen(argrest) - 1;
2815 while (temp >= argrest && isspace(*temp)) temp--;
2816 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2817 allow_domain_literals = TRUE;
2818 strip_trailing_dot = TRUE;
2820 allow_utf8_domains = TRUE;
2822 if (!(sender_address = parse_extract_address(argrest, &errmess,
2823 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2824 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2826 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2828 message_smtputf8 = string_is_utf8(sender_address);
2829 allow_utf8_domains = FALSE;
2831 allow_domain_literals = FALSE;
2832 strip_trailing_dot = FALSE;
2834 f.sender_address_forced = TRUE;
2838 /* -G: sendmail invocation to specify that it's a gateway submission and
2839 sendmail may complain about problems instead of fixing them.
2840 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2841 not at this time complain about problems. */
2847 /* -h: Set the hop count for an incoming message. Exim does not currently
2848 support this; it always computes it by counting the Received: headers.
2849 To put it in will require a change to the spool header file format. */
2853 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2854 if (!isdigit(*argrest)) badarg = TRUE;
2858 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2859 not to be documented for sendmail but mailx (at least) uses it) */
2862 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2866 /* -L: set the identifier used for syslog; equivalent to setting
2867 syslog_processname in the config file, but needs to be an admin option. */
2871 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2872 if ((sz = Ustrlen(argrest)) > 32)
2873 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2875 exim_fail("exim: the -L syslog name is too short\n");
2876 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2880 receiving_message = FALSE;
2882 /* -MC: continue delivery of another message via an existing open
2883 file descriptor. This option is used for an internal call by the
2884 smtp transport when there is a pending message waiting to go to an
2885 address to which it has got a connection. Five subsequent arguments are
2886 required: transport name, host name, IP address, sequence number, and
2887 message_id. Transports may decline to create new processes if the sequence
2888 number gets too big. The channel is stdin. This (-MC) must be the last
2889 argument. There's a subsequent check that the real-uid is privileged.
2891 If we are running in the test harness. delay for a bit, to let the process
2892 that set this one up complete. This makes for repeatability of the logging,
2895 if (Ustrcmp(argrest, "C") == 0)
2897 union sockaddr_46 interface_sock;
2898 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2901 exim_fail("exim: too many or too few arguments after -MC\n");
2903 if (msg_action_arg >= 0)
2904 exim_fail("exim: incompatible arguments\n");
2906 continue_transport = string_copy_taint(
2907 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2909 continue_hostname = string_copy_taint(
2910 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2912 continue_host_address = string_copy_taint(
2913 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2915 continue_sequence = Uatoi(argv[++i]);
2916 msg_action = MSG_DELIVER;
2917 msg_action_arg = ++i;
2918 forced_delivery = TRUE;
2919 queue_run_pid = passed_qr_pid;
2920 queue_run_pipe = passed_qr_pipe;
2922 if (!mac_ismsgid(argv[i]))
2923 exim_fail("exim: malformed message id %s after -MC option\n",
2926 /* Set up $sending_ip_address and $sending_port, unless proxied */
2928 if (!continue_proxy_cipher)
2929 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2931 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2934 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2937 testharness_pause_ms(500);
2941 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2945 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2946 precedes -MC (see above). The flag indicates that the host to which
2947 Exim is connected has accepted an AUTH sequence. */
2949 case 'A': f.smtp_authenticated = TRUE; break;
2951 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2952 that exim is connected to supports the esmtp extension DSN */
2954 case 'D': smtp_peer_options |= OPTION_DSN; break;
2956 /* -MCd: for debug, set a process-purpose string */
2958 case 'd': if (++i < argc)
2959 process_purpose = string_copy_taint(
2960 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2965 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2966 from the commandline should be tainted - but we will need an untainted
2967 value for the spoolfile when doing a -odi delivery process. */
2969 case 'G': if (++i < argc) queue_name = string_copy_taint(
2970 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2975 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2977 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2979 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2980 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2981 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2983 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2985 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2990 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2991 it preceded -MC (see above) */
2993 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2995 #ifdef SUPPORT_SOCKS
2996 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2997 case 'p': proxy_session = TRUE;
3000 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3003 proxy_local_port = Uatoi(argv[i]);
3006 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3009 proxy_external_port = Uatoi(argv[i]);
3015 /* -MCQ: pass on the pid of the queue-running process that started
3016 this chain of deliveries and the fd of its synchronizing pipe; this
3017 is useful only when it precedes -MC (see above) */
3019 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3021 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3025 /* -MCq: do a quota check on the given recipient for the given size
3026 of message. Separate from -MC. */
3027 case 'q': rcpt_verify_quota = TRUE;
3028 if (++i < argc) message_size = Uatoi(argv[i]);
3032 /* -MCS: set the smtp_use_size flag; this is useful only when it
3033 precedes -MC (see above) */
3035 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3038 /* -MCs: used with -MCt; SNI was sent */
3039 /* -MCr: ditto, DANE */
3042 case 's': if (++i < argc)
3044 continue_proxy_sni = string_copy_taint(
3045 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3047 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3052 /* -MCt: similar to -MCT below but the connection is still open
3053 via a proxy process which handles the TLS context and coding.
3054 Require three arguments for the proxied local address and port,
3055 and the TLS cipher. */
3057 case 't': if (++i < argc)
3058 sending_ip_address = string_copy_taint(
3059 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3063 sending_port = (int)(Uatol(argv[i]));
3066 continue_proxy_cipher = string_copy_taint(
3067 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3072 /* -MCT: set the tls_offered flag; this is useful only when it
3073 precedes -MC (see above). The flag indicates that the host to which
3074 Exim is connected has offered TLS support. */
3076 case 'T': smtp_peer_options |= OPTION_TLS; break;
3079 default: badarg = TRUE; break;
3084 /* -M[x]: various operations on the following list of message ids:
3085 -M deliver the messages, ignoring next retry times and thawing
3086 -Mc deliver the messages, checking next retry times, no thawing
3087 -Mf freeze the messages
3088 -Mg give up on the messages
3089 -Mt thaw the messages
3090 -Mrm remove the messages
3091 In the above cases, this must be the last option. There are also the
3092 following options which are followed by a single message id, and which
3093 act on that message. Some of them use the "recipient" addresses as well.
3094 -Mar add recipient(s)
3095 -MG move to a different queue
3096 -Mmad mark all recipients delivered
3097 -Mmd mark recipients(s) delivered
3099 -Mset load a message for use with -be
3101 -Mvc show copy (of whole message, in RFC 2822 format)
3108 msg_action = MSG_DELIVER;
3109 forced_delivery = f.deliver_force_thaw = TRUE;
3111 else if (Ustrcmp(argrest, "ar") == 0)
3113 msg_action = MSG_ADD_RECIPIENT;
3114 one_msg_action = TRUE;
3116 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3117 else if (Ustrcmp(argrest, "es") == 0)
3119 msg_action = MSG_EDIT_SENDER;
3120 one_msg_action = TRUE;
3122 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3123 else if (Ustrcmp(argrest, "g") == 0)
3125 msg_action = MSG_DELIVER;
3126 deliver_give_up = TRUE;
3128 else if (Ustrcmp(argrest, "G") == 0)
3130 msg_action = MSG_SETQUEUE;
3131 queue_name_dest = string_copy_taint(
3132 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3135 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3136 else if (Ustrcmp(argrest, "md") == 0)
3138 msg_action = MSG_MARK_DELIVERED;
3139 one_msg_action = TRUE;
3141 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3142 else if (Ustrcmp(argrest, "set") == 0)
3144 msg_action = MSG_LOAD;
3145 one_msg_action = TRUE;
3147 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3148 else if (Ustrcmp(argrest, "vb") == 0)
3150 msg_action = MSG_SHOW_BODY;
3151 one_msg_action = TRUE;
3153 else if (Ustrcmp(argrest, "vc") == 0)
3155 msg_action = MSG_SHOW_COPY;
3156 one_msg_action = TRUE;
3158 else if (Ustrcmp(argrest, "vh") == 0)
3160 msg_action = MSG_SHOW_HEADER;
3161 one_msg_action = TRUE;
3163 else if (Ustrcmp(argrest, "vl") == 0)
3165 msg_action = MSG_SHOW_LOG;
3166 one_msg_action = TRUE;
3168 else { badarg = TRUE; break; }
3170 /* All the -Mxx options require at least one message id. */
3172 msg_action_arg = i + 1;
3173 if (msg_action_arg >= argc)
3174 exim_fail("exim: no message ids given after %s option\n", arg);
3176 /* Some require only message ids to follow */
3178 if (!one_msg_action)
3180 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3181 exim_fail("exim: malformed message id %s after %s option\n",
3183 goto END_ARG; /* Remaining args are ids */
3186 /* Others require only one message id, possibly followed by addresses,
3187 which will be handled as normal arguments. */
3191 if (!mac_ismsgid(argv[msg_action_arg]))
3192 exim_fail("exim: malformed message id %s after %s option\n",
3193 argv[msg_action_arg], arg);
3199 /* Some programs seem to call the -om option without the leading o;
3200 for sendmail it askes for "me too". Exim always does this. */
3203 if (*argrest) badarg = TRUE;
3207 /* -N: don't do delivery - a debugging option that stops transports doing
3208 their thing. It implies debugging at the D_v level. */
3213 f.dont_deliver = TRUE;
3214 debug_selector |= D_v;
3215 debug_file = stderr;
3221 /* -n: This means "don't alias" in sendmail, apparently.
3222 For normal invocations, it has no effect.
3223 It may affect some other options. */
3229 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3230 option to the specified value. This form uses long names. We need to handle
3231 -O option=value and -Ooption=value. */
3236 exim_fail("exim: string expected after -O\n");
3242 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3245 if (!*(alias_arg = argrest))
3246 if (i+1 < argc) alias_arg = argv[++i];
3247 else exim_fail("exim: string expected after -oA\n");
3250 /* -oB: Set a connection message max value for remote deliveries */
3253 uschar * p = argrest;
3255 if (i+1 < argc && isdigit((argv[i+1][0])))
3259 connection_max_messages = 1;
3266 exim_fail("exim: number expected after -oB\n");
3267 connection_max_messages = Uatoi(p);
3272 /* -odb: background delivery */
3275 if (Ustrcmp(argrest, "b") == 0)
3277 f.synchronous_delivery = FALSE;
3278 arg_queue_only = FALSE;
3279 queue_only_set = TRUE;
3282 /* -odd: testsuite-only: add no inter-process delays */
3284 else if (Ustrcmp(argrest, "d") == 0)
3285 f.testsuite_delays = FALSE;
3287 /* -odf: foreground delivery (smail-compatible option); same effect as
3288 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3291 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3293 f.synchronous_delivery = TRUE;
3294 arg_queue_only = FALSE;
3295 queue_only_set = TRUE;
3298 /* -odq: queue only */
3300 else if (Ustrcmp(argrest, "q") == 0)
3302 f.synchronous_delivery = FALSE;
3303 arg_queue_only = TRUE;
3304 queue_only_set = TRUE;
3307 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3308 but no remote delivery */
3310 else if (Ustrcmp(argrest, "qs") == 0)
3312 f.queue_smtp = TRUE;
3313 arg_queue_only = FALSE;
3314 queue_only_set = TRUE;
3319 /* -oex: Sendmail error flags. As these are also accepted without the
3320 leading -o prefix, for compatibility with vacation and other callers,
3321 they are handled with -e above. */
3323 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3324 -oitrue: Another sendmail syntax for the same */
3327 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3332 /* -oM*: Set various characteristics for an incoming message; actually
3333 acted on for trusted callers only. */
3338 exim_fail("exim: data expected after -oM%s\n", argrest);
3340 /* -oMa: Set sender host address */
3342 if (Ustrcmp(argrest, "a") == 0)
3343 sender_host_address = string_copy_taint(
3344 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3347 /* -oMaa: Set authenticator name */
3349 else if (Ustrcmp(argrest, "aa") == 0)
3350 sender_host_authenticated = string_copy_taint(
3351 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3354 /* -oMas: setting authenticated sender */
3356 else if (Ustrcmp(argrest, "as") == 0)
3357 authenticated_sender = string_copy_taint(
3358 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3361 /* -oMai: setting authenticated id */
3363 else if (Ustrcmp(argrest, "ai") == 0)
3364 authenticated_id = string_copy_taint(
3365 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3368 /* -oMi: Set incoming interface address */
3370 else if (Ustrcmp(argrest, "i") == 0)
3371 interface_address = string_copy_taint(
3372 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3375 /* -oMm: Message reference */
3377 else if (Ustrcmp(argrest, "m") == 0)
3379 if (!mac_ismsgid(argv[i+1]))
3380 exim_fail("-oMm must be a valid message ID\n");
3381 if (!f.trusted_config)
3382 exim_fail("-oMm must be called by a trusted user/config\n");
3383 message_reference = argv[++i];
3386 /* -oMr: Received protocol */
3388 else if (Ustrcmp(argrest, "r") == 0)
3390 if (received_protocol)
3391 exim_fail("received_protocol is set already\n");
3393 received_protocol = string_copy_taint(
3394 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3397 /* -oMs: Set sender host name */
3399 else if (Ustrcmp(argrest, "s") == 0)
3400 sender_host_name = string_copy_taint(
3401 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3404 /* -oMt: Set sender ident */
3406 else if (Ustrcmp(argrest, "t") == 0)
3408 sender_ident_set = TRUE;
3409 sender_ident = string_copy_taint(
3410 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3414 /* Else a bad argument */
3421 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3422 seem to call this as -m (undocumented), so that is also accepted (see
3424 /* -oo: An ancient flag for old-style addresses which still seems to
3425 crop up in some calls (see in SCO). */
3429 if (*argrest) badarg = TRUE;
3432 /* -oP <name>: set pid file path for daemon
3433 -oPX: delete pid file of daemon */
3436 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3437 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3438 "(uid=%d euid=%d | %d)\n",
3439 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3440 if (!*argrest) override_pid_file_path = argv[++i];
3441 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3446 /* -or <n>: set timeout for non-SMTP acceptance
3447 -os <n>: set timeout for SMTP acceptance */
3452 int * tp = argrest[-1] == 'r'
3453 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3455 *tp = readconf_readtime(argrest, 0, FALSE);
3456 else if (i+1 < argc)
3457 *tp = readconf_readtime(argv[++i], 0, FALSE);
3460 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3464 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3465 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3468 if (*argrest) badarg = TRUE;
3469 else override_local_interfaces = string_copy_taint(
3470 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3474 /* -oY: Override creation of daemon notifier socket */
3477 if (*argrest) badarg = TRUE;
3478 else notifier_socket = NULL;
3481 /* Unknown -o argument */
3489 /* -ps: force Perl startup; -pd force delayed Perl startup */
3493 if (*argrest == 's' && argrest[1] == 0)
3495 perl_start_option = 1;
3498 if (*argrest == 'd' && argrest[1] == 0)
3500 perl_start_option = -1;
3505 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3506 which sets the host protocol and host name */
3509 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3513 uschar * hn = Ustrchr(argrest, ':');
3515 if (received_protocol)
3516 exim_fail("received_protocol is set already\n");
3519 received_protocol = string_copy_taint(
3520 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3524 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3525 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3526 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3533 receiving_message = FALSE;
3534 if (queue_interval >= 0)
3535 exim_fail("exim: -q specified more than once\n");
3537 /* -qq...: Do queue runs in a 2-stage manner */
3539 if (*argrest == 'q')
3541 f.queue_2stage = TRUE;
3545 /* -qi...: Do only first (initial) deliveries */
3547 if (*argrest == 'i')
3549 f.queue_run_first_delivery = TRUE;
3553 /* -qf...: Run the queue, forcing deliveries
3554 -qff..: Ditto, forcing thawing as well */
3556 if (*argrest == 'f')
3558 f.queue_run_force = TRUE;
3559 if (*++argrest == 'f')
3561 f.deliver_force_thaw = TRUE;
3566 /* -q[f][f]l...: Run the queue only on local deliveries */
3568 if (*argrest == 'l')
3570 f.queue_run_local = TRUE;
3574 /* -q[f][f][l][G<name>]... Work on the named queue */
3576 if (*argrest == 'G')
3579 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3580 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3581 queue_name = string_copyn(argrest, i);
3583 if (*argrest == '/') argrest++;
3586 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3587 only, optionally named, optionally starting from a given message id. */
3589 if (!(list_queue || count_queue))
3591 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3594 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3595 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3596 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3597 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3600 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3601 forced, optionally local only, optionally named. */
3603 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3605 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3609 case 'R': /* Synonymous with -qR... */
3611 const uschar *tainted_selectstr;
3613 receiving_message = FALSE;
3615 /* -Rf: As -R (below) but force all deliveries,
3616 -Rff: Ditto, but also thaw all frozen messages,
3617 -Rr: String is regex
3618 -Rrf: Regex and force
3619 -Rrff: Regex and force and thaw
3621 in all cases provided there are no further characters in this
3625 for (int i = 0; i < nelem(rsopts); i++)
3626 if (Ustrcmp(argrest, rsopts[i]) == 0)
3628 if (i != 2) f.queue_run_force = TRUE;
3629 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3630 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3631 argrest += Ustrlen(rsopts[i]);
3634 /* -R: Set string to match in addresses for forced queue run to
3635 pick out particular messages. */
3637 /* Avoid attacks from people providing very long strings, and do so before
3640 tainted_selectstr = argrest;
3641 else if (i+1 < argc)
3642 tainted_selectstr = argv[++i];
3644 exim_fail("exim: string expected after -R\n");
3645 deliver_selectstring = string_copy_taint(
3646 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3651 /* -r: an obsolete synonym for -f (see above) */
3654 /* -S: Like -R but works on sender. */
3656 case 'S': /* Synonymous with -qS... */
3658 const uschar *tainted_selectstr;
3660 receiving_message = FALSE;
3662 /* -Sf: As -S (below) but force all deliveries,
3663 -Sff: Ditto, but also thaw all frozen messages,
3664 -Sr: String is regex
3665 -Srf: Regex and force
3666 -Srff: Regex and force and thaw
3668 in all cases provided there are no further characters in this
3672 for (int i = 0; i < nelem(rsopts); i++)
3673 if (Ustrcmp(argrest, rsopts[i]) == 0)
3675 if (i != 2) f.queue_run_force = TRUE;
3676 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3677 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3678 argrest += Ustrlen(rsopts[i]);
3681 /* -S: Set string to match in addresses for forced queue run to
3682 pick out particular messages. */
3685 tainted_selectstr = argrest;
3686 else if (i+1 < argc)
3687 tainted_selectstr = argv[++i];
3689 exim_fail("exim: string expected after -S\n");
3690 deliver_selectstring_sender = string_copy_taint(
3691 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3696 /* -Tqt is an option that is exclusively for use by the testing suite.
3697 It is not recognized in other circumstances. It allows for the setting up
3698 of explicit "queue times" so that various warning/retry things can be
3699 tested. Otherwise variability of clock ticks etc. cause problems. */
3702 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3703 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3708 /* -t: Set flag to extract recipients from body of message. */
3711 if (!*argrest) extract_recipients = TRUE;
3713 /* -ti: Set flag to extract recipients from body of message, and also
3714 specify that dot does not end the message. */
3716 else if (Ustrcmp(argrest, "i") == 0)
3718 extract_recipients = TRUE;
3722 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3725 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3732 /* -U: This means "initial user submission" in sendmail, apparently. The
3733 doc claims that in future sendmail may refuse syntactically invalid
3734 messages instead of fixing them. For the moment, we just ignore it. */
3740 /* -v: verify things - this is a very low-level debugging */
3745 debug_selector |= D_v;
3746 debug_file = stderr;
3752 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3754 The -x flag tells the sendmail command that mail from a local
3755 mail program has National Language Support (NLS) extended characters
3756 in the body of the mail item. The sendmail command can send mail with
3757 extended NLS characters across networks that normally corrupts these
3760 As Exim is 8-bit clean, it just ignores this flag. */
3763 if (*argrest) badarg = TRUE;
3766 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3767 logs to that file. We swallow the parameter and otherwise ignore it. */
3772 exim_fail("exim: string expected after -X\n");
3775 /* -z: a line of text to log */
3780 log_oneline = string_copy_taint(
3781 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3784 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3787 /* All other initial characters are errors */
3792 } /* End of high-level switch statement */
3794 /* Failed to recognize the option, or syntax error */
3797 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3798 "option %s\n", arg);
3802 /* If -R or -S have been specified without -q, assume a single queue run. */
3804 if ( (deliver_selectstring || deliver_selectstring_sender)
3805 && queue_interval < 0)
3810 store_pool = old_pool;
3813 /* If usage_wanted is set we call the usage function - which never returns */
3814 if (usage_wanted) exim_usage(called_as);
3816 /* Arguments have been processed. Check for incompatibilities. */
3817 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3818 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3819 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3820 || filter_test != FTEST_NONE
3821 || msg_action_arg > 0 && !one_msg_action
3823 || ( msg_action_arg > 0
3824 && ( f.daemon_listen || queue_interval > 0 || list_options
3825 || checking && msg_action != MSG_LOAD
3826 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3828 || ( (f.daemon_listen || queue_interval > 0)
3829 && ( sender_address || list_options || list_queue || checking
3832 || f.daemon_listen && queue_interval == 0
3833 || f.inetd_wait_mode && queue_interval >= 0
3835 && ( checking || smtp_input || extract_recipients
3836 || filter_test != FTEST_NONE || bi_option
3838 || ( verify_address_mode
3839 && ( f.address_test_mode || smtp_input || extract_recipients
3840 || filter_test != FTEST_NONE || bi_option
3842 || ( f.address_test_mode
3843 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3847 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3849 || deliver_selectstring && queue_interval < 0
3850 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3852 exim_fail("exim: incompatible command-line options or arguments\n");
3854 /* If debugging is set up, set the file and the file descriptor to pass on to
3855 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3856 to run in the foreground. */
3858 if (debug_selector != 0)
3860 debug_file = stderr;
3861 debug_fd = fileno(debug_file);
3862 f.background_daemon = FALSE;
3863 testharness_pause_ms(100); /* lets caller finish */
3864 if (debug_selector != D_v) /* -v only doesn't show this */
3866 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3867 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3869 if (!version_printed)
3870 show_whats_supported(FALSE);
3874 /* When started with root privilege, ensure that the limits on the number of
3875 open files and the number of processes (where that is accessible) are
3876 sufficiently large, or are unset, in case Exim has been called from an
3877 environment where the limits are screwed down. Not all OS have the ability to
3878 change some of these limits. */
3882 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3888 #ifdef RLIMIT_NOFILE
3889 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3891 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3893 rlp.rlim_cur = rlp.rlim_max = 0;
3896 /* I originally chose 1000 as a nice big number that was unlikely to
3897 be exceeded. It turns out that some older OS have a fixed upper limit of
3900 if (rlp.rlim_cur < 1000)
3902 rlp.rlim_cur = rlp.rlim_max = 1000;
3903 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3905 rlp.rlim_cur = rlp.rlim_max = 256;
3906 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3907 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3914 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3916 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3918 rlp.rlim_cur = rlp.rlim_max = 0;
3921 # ifdef RLIM_INFINITY
3922 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3924 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3926 if (rlp.rlim_cur < 1000)
3928 rlp.rlim_cur = rlp.rlim_max = 1000;
3930 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3931 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3937 /* Exim is normally entered as root (but some special configurations are
3938 possible that don't do this). However, it always spins off sub-processes that
3939 set their uid and gid as required for local delivery. We don't want to pass on
3940 any extra groups that root may belong to, so we want to get rid of them all at
3943 We need to obey setgroups() at this stage, before possibly giving up root
3944 privilege for a changed configuration file, but later on we might need to
3945 check on the additional groups for the admin user privilege - can't do that
3946 till after reading the config, which might specify the exim gid. Therefore,
3947 save the group list here first. */
3949 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3950 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3952 /* There is a fundamental difference in some BSD systems in the matter of
3953 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3954 known not to be different. On the "different" systems there is a single group
3955 list, and the first entry in it is the current group. On all other versions of
3956 Unix there is a supplementary group list, which is in *addition* to the current
3957 group. Consequently, to get rid of all extraneous groups on a "standard" system
3958 you pass over 0 groups to setgroups(), while on a "different" system you pass
3959 over a single group - the current group, which is always the first group in the
3960 list. Calling setgroups() with zero groups on a "different" system results in
3961 an error return. The following code should cope with both types of system.
3963 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3964 the "setgroups() with zero groups" - and changes the egid.
3965 Thanks to that we had to stash the original_egid above, for use below
3966 in the call to exim_setugid().
3968 However, if this process isn't running as root, setgroups() can't be used
3969 since you have to be root to run it, even if throwing away groups.
3970 Except, sigh, for Hurd - where you can.
3971 Not being root here happens only in some unusual configurations. */
3974 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3975 && setgroups(0, NULL) != 0
3977 && setgroups(1, group_list) != 0)
3978 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3980 /* If the configuration file name has been altered by an argument on the
3981 command line (either a new file name or a macro definition) and the caller is
3982 not root, or if this is a filter testing run, remove any setuid privilege the
3983 program has and run as the underlying user.
3985 The exim user is locked out of this, which severely restricts the use of -C
3988 Otherwise, set the real ids to the effective values (should be root unless run
3989 from inetd, which it can either be root or the exim uid, if one is configured).
3991 There is a private mechanism for bypassing some of this, in order to make it
3992 possible to test lots of configurations automatically, without having either to
3993 recompile each time, or to patch in an actual configuration file name and other
3994 values (such as the path name). If running in the test harness, pretend that
3995 configuration file changes and macro definitions haven't happened. */
3998 (!f.trusted_config || /* Config changed, or */
3999 !macros_trusted(opt_D_used)) && /* impermissible macros and */
4000 real_uid != root_uid && /* Not root, and */
4001 !f.running_in_test_harness /* Not fudged */
4003 expansion_test /* expansion testing */
4005 filter_test != FTEST_NONE) /* Filter testing */
4007 setgroups(group_count, group_list);
4008 exim_setugid(real_uid, real_gid, FALSE,
4009 US"-C, -D, -be or -bf forces real uid");
4010 removed_privilege = TRUE;
4012 /* In the normal case when Exim is called like this, stderr is available
4013 and should be used for any logging information because attempts to write
4014 to the log will usually fail. To arrange this, we unset really_exim. However,
4015 if no stderr is available there is no point - we might as well have a go
4016 at the log (if it fails, syslog will be written).
4018 Note that if the invoker is Exim, the logs remain available. Messing with
4019 this causes unlogged successful deliveries. */
4021 if (log_stderr && real_uid != exim_uid)
4022 f.really_exim = FALSE;
4025 /* Privilege is to be retained for the moment. It may be dropped later,
4026 depending on the job that this Exim process has been asked to do. For now, set
4027 the real uid to the effective so that subsequent re-execs of Exim are done by a
4031 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4033 /* If testing a filter, open the file(s) now, before wasting time doing other
4034 setups and reading the message. */
4036 if (filter_test & FTEST_SYSTEM)
4037 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4038 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4041 if (filter_test & FTEST_USER)
4042 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4043 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4046 /* Initialise lookup_list
4047 If debugging, already called above via version reporting.
4048 In either case, we initialise the list of available lookups while running
4049 as root. All dynamically modules are loaded from a directory which is
4050 hard-coded into the binary and is code which, if not a module, would be
4051 part of Exim already. Ability to modify the content of the directory
4052 is equivalent to the ability to modify a setuid binary!
4054 This needs to happen before we read the main configuration. */
4057 /*XXX this excrescence could move to the testsuite standard config setup file */
4059 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4062 /* Read the main runtime configuration data; this gives up if there
4063 is a failure. It leaves the configuration file open so that the subsequent
4064 configuration data for delivery can be read if needed.
4066 NOTE: immediately after opening the configuration file we change the working
4067 directory to "/"! Later we change to $spool_directory. We do it there, because
4068 during readconf_main() some expansion takes place already. */
4070 /* Store the initial cwd before we change directories. Can be NULL if the
4071 dir has already been unlinked. */
4072 initial_cwd = os_getcwd(NULL, 0);
4073 if (!initial_cwd && errno)
4074 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4076 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4077 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4080 -be[m] expansion test -
4081 -b[fF] filter test new
4083 -bmalware malware_test_file new
4085 -brw rewrite test new
4087 -bv[s] address verify -
4089 -bP <option> (except -bP config, which sets list_config)
4091 If any of these options is set, we suppress warnings about configuration
4092 issues (currently about tls_advertise_hosts and keep_environment not being
4096 int old_pool = store_pool;
4097 #ifdef MEASURE_TIMING
4098 struct timeval t0, diff;
4099 (void)gettimeofday(&t0, NULL);
4102 store_pool = POOL_CONFIG;
4103 readconf_main(checking || list_options);
4104 store_pool = old_pool;
4106 #ifdef MEASURE_TIMING
4107 report_time_since(&t0, US"readconf_main (delta)");
4111 /* Now in directory "/" */
4113 if (cleanup_environment() == FALSE)
4114 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4117 /* If an action on specific messages is requested, or if a daemon or queue
4118 runner is being started, we need to know if Exim was called by an admin user.
4119 This is the case if the real user is root or exim, or if the real group is
4120 exim, or if one of the supplementary groups is exim or a group listed in
4121 admin_groups. We don't fail all message actions immediately if not admin_user,
4122 since some actions can be performed by non-admin users. Instead, set admin_user
4123 for later interrogation. */
4125 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4126 f.admin_user = TRUE;
4128 for (int i = 0; i < group_count && !f.admin_user; i++)
4129 if (group_list[i] == exim_gid)
4130 f.admin_user = TRUE;
4131 else if (admin_groups)
4132 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4133 if (admin_groups[j] == group_list[i])
4134 f.admin_user = TRUE;
4136 /* Another group of privileged users are the trusted users. These are root,
4137 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4138 are permitted to specify sender_addresses with -f on the command line, and
4139 other message parameters as well. */
4141 if (real_uid == root_uid || real_uid == exim_uid)
4142 f.trusted_caller = TRUE;
4146 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4147 if (trusted_users[i] == real_uid)
4148 f.trusted_caller = TRUE;
4151 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4152 if (trusted_groups[i] == real_gid)
4153 f.trusted_caller = TRUE;
4154 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4155 if (trusted_groups[i] == group_list[j])
4156 f.trusted_caller = TRUE;
4159 /* At this point, we know if the user is privileged and some command-line
4160 options become possibly impermissible, depending upon the configuration file. */
4162 if (checking && commandline_checks_require_admin && !f.admin_user)
4163 exim_fail("exim: those command-line flags are set to require admin\n");
4165 /* Handle the decoding of logging options. */
4167 decode_bits(log_selector, log_selector_size, log_notall,
4168 log_selector_string, log_options, log_options_count, US"log", 0);
4172 debug_printf("configuration file is %s\n", config_main_filename);
4173 debug_printf("log selectors =");
4174 for (int i = 0; i < log_selector_size; i++)
4175 debug_printf(" %08x", log_selector[i]);
4179 /* If domain literals are not allowed, check the sender address that was
4180 supplied with -f. Ditto for a stripped trailing dot. */
4184 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4185 exim_fail("exim: bad -f address \"%s\": domain literals not "
4186 "allowed\n", sender_address);
4187 if (f_end_dot && !strip_trailing_dot)
4188 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4189 "(trailing dot not allowed)\n", sender_address);
4192 /* See if an admin user overrode our logging. */
4194 if (cmdline_syslog_name)
4197 syslog_processname = cmdline_syslog_name;
4198 log_file_path = string_copy(CUS"syslog");
4201 /* not a panic, non-privileged users should not be able to spam paniclog */
4203 "exim: you lack sufficient privilege to specify syslog process name\n");
4205 /* Paranoia check of maximum lengths of certain strings. There is a check
4206 on the length of the log file path in log.c, which will come into effect
4207 if there are any calls to write the log earlier than this. However, if we
4208 get this far but the string is very long, it is better to stop now than to
4209 carry on and (e.g.) receive a message and then have to collapse. The call to
4210 log_write() from here will cause the ultimate panic collapse if the complete
4211 file name exceeds the buffer length. */
4213 if (Ustrlen(log_file_path) > 200)
4214 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4215 "log_file_path is longer than 200 chars: aborting");
4217 if (Ustrlen(pid_file_path) > 200)
4218 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4219 "pid_file_path is longer than 200 chars: aborting");
4221 if (Ustrlen(spool_directory) > 200)
4222 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4223 "spool_directory is longer than 200 chars: aborting");
4225 /* Length check on the process name given to syslog for its TAG field,
4226 which is only permitted to be 32 characters or less. See RFC 3164. */
4228 if (Ustrlen(syslog_processname) > 32)
4229 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4230 "syslog_processname is longer than 32 chars: aborting");
4235 log_write(0, LOG_MAIN, "%s", log_oneline);
4236 return EXIT_SUCCESS;
4239 return EXIT_FAILURE;
4241 /* In some operating systems, the environment variable TMPDIR controls where
4242 temporary files are created; Exim doesn't use these (apart from when delivering
4243 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4244 If TMPDIR is found in the environment, reset it to the value defined in the
4245 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4246 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4247 EXIM_TMPDIR by the build scripts.
4251 if (environ) for (uschar ** p = USS environ; *p; p++)
4252 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4254 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4255 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4257 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4261 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4262 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4263 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4264 called by a user who has set the TZ variable. This then affects the timestamps
4265 in log files and in Received: headers, and any created Date: header lines. The
4266 required timezone is settable in the configuration file, so nothing can be done
4267 about this earlier - but hopefully nothing will normally be logged earlier than
4268 this. We have to make a new environment if TZ is wrong, but don't bother if
4269 timestamps_utc is set, because then all times are in UTC anyway. */
4271 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4272 f.timestamps_utc = TRUE;
4275 uschar *envtz = US getenv("TZ");
4277 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4278 : timezone_string != NULL
4281 uschar **p = USS environ;
4285 if (environ) while (*p++) count++;
4286 if (!envtz) count++;
4287 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4288 if (environ) for (p = USS environ; *p; p++)
4289 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4290 if (timezone_string)
4292 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4293 sprintf(CS *newp++, "TZ=%s", timezone_string);
4298 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4299 tod_stamp(tod_log));
4303 /* Handle the case when we have removed the setuid privilege because of -C or
4304 -D. This means that the caller of Exim was not root.
4306 There is a problem if we were running as the Exim user. The sysadmin may
4307 expect this case to retain privilege because "the binary was called by the
4308 Exim user", but it hasn't, because either the -D option set macros, or the
4309 -C option set a non-trusted configuration file. There are two possibilities:
4311 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4312 to do message deliveries. Thus, the fact that it is running as a
4313 non-privileged user is plausible, and might be wanted in some special
4314 configurations. However, really_exim will have been set false when
4315 privilege was dropped, to stop Exim trying to write to its normal log
4316 files. Therefore, re-enable normal log processing, assuming the sysadmin
4317 has set up the log directory correctly.
4319 (2) If deliver_drop_privilege is not set, the configuration won't work as
4320 apparently intended, and so we log a panic message. In order to retain
4321 root for -C or -D, the caller must either be root or be invoking a
4322 trusted configuration file (when deliver_drop_privilege is false). */
4324 if ( removed_privilege
4325 && (!f.trusted_config || opt_D_used)
4326 && real_uid == exim_uid)
4327 if (deliver_drop_privilege)
4328 f.really_exim = TRUE; /* let logging work normally */
4330 log_write(0, LOG_MAIN|LOG_PANIC,
4331 "exim user lost privilege for using %s option",
4332 f.trusted_config? "-D" : "-C");
4334 /* Start up Perl interpreter if Perl support is configured and there is a
4335 perl_startup option, and the configuration or the command line specifies
4336 initializing starting. Note that the global variables are actually called
4337 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4340 if (perl_start_option != 0)
4341 opt_perl_at_start = (perl_start_option > 0);
4342 if (opt_perl_at_start && opt_perl_startup != NULL)
4345 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4346 if ((errstr = init_perl(opt_perl_startup)))
4347 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4348 opt_perl_started = TRUE;
4350 #endif /* EXIM_PERL */
4352 /* Log the arguments of the call if the configuration file said so. This is
4353 a debugging feature for finding out what arguments certain MUAs actually use.
4354 Don't attempt it if logging is disabled, or if listing variables or if
4355 verifying/testing addresses or expansions. */
4357 if ( (debug_selector & D_any || LOGGING(arguments))
4358 && f.really_exim && !list_options && !checking)
4360 uschar *p = big_buffer;
4361 Ustrcpy(p, US"cwd= (failed)");
4368 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4369 p += Ustrlen(CCS p);
4372 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4374 for (int i = 0; i < argc; i++)
4376 int len = Ustrlen(argv[i]);
4377 const uschar *printing;
4379 if (p + len + 8 >= big_buffer + big_buffer_size)
4381 Ustrcpy(p, US" ...");
4382 log_write(0, LOG_MAIN, "%s", big_buffer);
4383 Ustrcpy(big_buffer, US"...");
4386 printing = string_printing(argv[i]);
4387 if (!*printing) quote = US"\"";
4390 const uschar *pp = printing;
4392 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4394 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4395 (p - big_buffer) - 4), printing, quote);
4398 if (LOGGING(arguments))
4399 log_write(0, LOG_MAIN, "%s", big_buffer);
4401 debug_printf("%s\n", big_buffer);
4404 /* Set the working directory to be the top-level spool directory. We don't rely
4405 on this in the code, which always uses fully qualified names, but it's useful
4406 for core dumps etc. Don't complain if it fails - the spool directory might not
4407 be generally accessible and calls with the -C option (and others) have lost
4408 privilege by now. Before the chdir, we try to ensure that the directory exists.
4411 if (Uchdir(spool_directory) != 0)
4413 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4414 (void) Uchdir(spool_directory);
4417 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4418 alias file. Exim doesn't have such a concept, but this call is screwed into
4419 Sun's YP makefiles. Handle this by calling a configured script, as the real
4420 user who called Exim. The -oA option can be used to pass an argument to the
4425 (void) fclose(config_file);
4426 if (bi_command && *bi_command)
4430 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4431 if (alias_arg) argv[i++] = alias_arg;
4434 setgroups(group_count, group_list);
4435 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4437 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4438 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4440 execv(CS argv[0], (char *const *)argv);
4441 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4445 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4450 /* We moved the admin/trusted check to be immediately after reading the
4451 configuration file. We leave these prints here to ensure that syslog setup,
4452 logfile setup, and so on has already happened. */
4454 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4455 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4457 /* Only an admin user may start the daemon or force a queue run in the default
4458 configuration, but the queue run restriction can be relaxed. Only an admin
4459 user may request that a message be returned to its sender forthwith. Only an
4460 admin user may specify a debug level greater than D_v (because it might show
4461 passwords, etc. in lookup queries). Only an admin user may request a queue
4462 count. Only an admin user can use the test interface to scan for email
4463 (because Exim will be in the spool dir and able to look at mails). */
4467 BOOL debugset = (debug_selector & ~D_v) != 0;
4468 if ( deliver_give_up || f.daemon_listen || malware_test_file
4469 || count_queue && queue_list_requires_admin
4470 || list_queue && queue_list_requires_admin
4471 || queue_interval >= 0 && prod_requires_admin
4472 || queue_name_dest && prod_requires_admin
4473 || debugset && !f.running_in_test_harness
4475 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4478 /* If the real user is not root or the exim uid, the argument for passing
4479 in an open TCP/IP connection for another message is not permitted, nor is
4480 running with the -N option for any delivery action, unless this call to exim is
4481 one that supplied an input message, or we are using a patched exim for
4482 regression testing. */
4484 if ( real_uid != root_uid && real_uid != exim_uid
4485 && ( continue_hostname
4487 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4489 && !f.running_in_test_harness
4491 exim_fail("exim: Permission denied\n");
4493 /* If the caller is not trusted, certain arguments are ignored when running for
4494 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4495 Note that authority for performing certain actions on messages is tested in the
4496 queue_action() function. */
4498 if (!f.trusted_caller && !checking)
4500 sender_host_name = sender_host_address = interface_address =
4501 sender_ident = received_protocol = NULL;
4502 sender_host_port = interface_port = 0;
4503 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4506 /* If a sender host address is set, extract the optional port number off the
4507 end of it and check its syntax. Do the same thing for the interface address.
4508 Exim exits if the syntax is bad. */
4512 if (sender_host_address)
4513 sender_host_port = check_port(sender_host_address);
4514 if (interface_address)
4515 interface_port = check_port(interface_address);
4518 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4521 if (f.trusted_caller)
4523 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4524 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4527 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4530 /* If an SMTP message is being received check to see if the standard input is a
4531 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4532 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4537 union sockaddr_46 inetd_sock;
4538 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4539 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4541 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4542 if (family == AF_INET || family == AF_INET6)
4544 union sockaddr_46 interface_sock;
4545 size = sizeof(interface_sock);
4547 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4548 interface_address = host_ntoa(-1, &interface_sock, NULL,
4551 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4553 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4556 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4557 NULL, &sender_host_port);
4558 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4559 "inetd is not supported when mua_wrapper is set");
4563 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4568 /* If the load average is going to be needed while receiving a message, get it
4569 now for those OS that require the first call to os_getloadavg() to be done as
4570 root. There will be further calls later for each message received. */
4572 #ifdef LOAD_AVG_NEEDS_ROOT
4573 if ( receiving_message
4574 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4575 load_average = OS_GETLOADAVG();
4578 /* The queue_only configuration option can be overridden by -odx on the command
4579 line, except that if queue_only_override is false, queue_only cannot be unset
4580 from the command line. */
4582 if (queue_only_set && (queue_only_override || arg_queue_only))
4583 queue_only = arg_queue_only;
4585 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4588 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4589 if (arg_smtp_receive_timeout >= 0)
4590 smtp_receive_timeout = arg_smtp_receive_timeout;
4592 /* If Exim was started with root privilege, unless we have already removed the
4593 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4594 except when starting the daemon or doing some kind of delivery or address
4595 testing (-bt). These are the only cases when root need to be retained. We run
4596 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4597 retained only for starting the daemon. We always do the initgroups() in this
4598 situation (controlled by the TRUE below), in order to be as close as possible
4599 to the state Exim usually runs in. */
4601 if ( !unprivileged /* originally had root AND */
4602 && !removed_privilege /* still got root AND */
4603 && !f.daemon_listen /* not starting the daemon */
4604 && queue_interval <= 0 /* (either kind of daemon) */
4605 && ( /* AND EITHER */
4606 deliver_drop_privilege /* requested unprivileged */
4608 queue_interval < 0 /* not running the queue */
4609 && ( msg_action_arg < 0 /* and */
4610 || msg_action != MSG_DELIVER /* not delivering */
4612 && (!checking || !f.address_test_mode) /* not address checking */
4613 && !rcpt_verify_quota /* and not quota checking */
4615 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4617 /* When we are retaining a privileged uid, we still change to the exim gid. */
4622 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4623 rv = setgid(exim_gid);
4624 /* Impact of failure is that some stuff might end up with an incorrect group.
4625 We track this for failures from root, since any attempt to change privilege
4626 by root should succeed and failures should be examined. For non-root,
4627 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4628 no need to complain then. */
4630 if (!(unprivileged || removed_privilege))
4631 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4634 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4635 (long int)exim_gid, strerror(errno));
4639 /* Handle a request to scan a file for malware */
4640 if (malware_test_file)
4642 #ifdef WITH_CONTENT_SCAN
4644 set_process_info("scanning file for malware");
4645 if ((result = malware_in_file(malware_test_file)) == FAIL)
4647 printf("No malware found.\n");
4652 printf("Malware lookup returned non-okay/fail: %d\n", result);
4656 printf("Malware found: %s\n", malware_name);
4658 printf("Malware scan detected malware of unknown name.\n");
4660 printf("Malware scanning not enabled at compile time.\n");
4665 /* Handle a request to list the delivery queue */
4669 set_process_info("listing the queue");
4670 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4674 /* Handle a request to count the delivery queue */
4678 set_process_info("counting the queue");
4679 fprintf(stdout, "%u\n", queue_count());
4683 /* Handle actions on specific messages, except for the force delivery and
4684 message load actions, which are done below. Some actions take a whole list of
4685 message ids, which are known to continue up to the end of the arguments. Others
4686 take a single message id and then operate on the recipients list. */
4688 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4690 int yield = EXIT_SUCCESS;
4691 set_process_info("acting on specified messages");
4693 /* ACL definitions may be needed when removing a message (-Mrm) because
4694 event_action gets expanded */
4696 if (msg_action == MSG_REMOVE)
4698 int old_pool = store_pool;
4699 store_pool = POOL_CONFIG;
4701 store_pool = old_pool;
4702 store_writeprotect(POOL_CONFIG);
4705 if (!one_msg_action)
4707 for (i = msg_action_arg; i < argc; i++)
4708 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4709 yield = EXIT_FAILURE;
4712 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4713 default: printf("\n"); break;
4717 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4718 recipients_arg)) yield = EXIT_FAILURE;
4722 /* We used to set up here to skip reading the ACL section, on
4723 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4724 Now, since the intro of the ${acl } expansion, ACL definitions may be
4725 needed in transports so we lost the optimisation. */
4728 int old_pool = store_pool;
4729 #ifdef MEASURE_TIMING
4730 struct timeval t0, diff;
4731 (void)gettimeofday(&t0, NULL);
4734 store_pool = POOL_CONFIG;
4736 store_pool = old_pool;
4738 /* -be can add macro definitions, needing to link to the macro structure
4739 chain. Otherwise, make the memory used for config data readonly. */
4741 if (!expansion_test)
4742 store_writeprotect(POOL_CONFIG);
4744 #ifdef MEASURE_TIMING
4745 report_time_since(&t0, US"readconf_rest (delta)");
4749 /* Handle a request to check quota */
4750 if (rcpt_verify_quota)
4751 if (real_uid != root_uid && real_uid != exim_uid)
4752 exim_fail("exim: Permission denied\n");
4753 else if (recipients_arg >= argc)
4754 exim_fail("exim: missing recipient for quota check\n");
4757 verify_quota(argv[recipients_arg]);
4758 exim_exit(EXIT_SUCCESS);
4761 /* Handle the -brt option. This is for checking out retry configurations.
4762 The next three arguments are a domain name or a complete address, and
4763 optionally two error numbers. All it does is to call the function that
4764 scans the retry configuration data. */
4766 if (test_retry_arg >= 0)
4768 retry_config *yield;
4769 int basic_errno = 0;
4771 const uschar *s1, *s2;
4773 if (test_retry_arg >= argc)
4775 printf("-brt needs a domain or address argument\n");
4776 exim_exit(EXIT_FAILURE);
4778 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4781 /* If the first argument contains no @ and no . it might be a local user
4782 or it might be a single-component name. Treat as a domain. */
4784 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4786 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4787 "being \ntreated as a one-component domain, not as a local part.\n\n",
4791 /* There may be an optional second domain arg. */
4793 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4794 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4796 /* The final arg is an error name */
4798 if (test_retry_arg < argc)
4800 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4802 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4805 printf("%s\n", CS error);
4806 return EXIT_FAILURE;
4809 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4810 code > 100 as an error is for matching codes to the decade. Turn them into
4811 a real error code, off the decade. */
4813 if (basic_errno == ERRNO_MAIL4XX ||
4814 basic_errno == ERRNO_RCPT4XX ||
4815 basic_errno == ERRNO_DATA4XX)
4817 int code = (more_errno >> 8) & 255;
4819 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4820 else if (code > 100)
4821 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4825 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4826 printf("No retry information found\n");
4829 more_errno = yield->more_errno;
4830 printf("Retry rule: %s ", yield->pattern);
4832 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4834 printf("quota%s%s ",
4835 (more_errno > 0)? "_" : "",
4836 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4838 else if (yield->basic_errno == ECONNREFUSED)
4840 printf("refused%s%s ",
4841 (more_errno > 0)? "_" : "",
4842 (more_errno == 'M')? "MX" :
4843 (more_errno == 'A')? "A" : "");
4845 else if (yield->basic_errno == ETIMEDOUT)
4848 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4850 if (more_errno != 0) printf("_%s",
4851 (more_errno == 'M')? "MX" : "A");
4854 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4855 printf("auth_failed ");
4858 for (retry_rule * r = yield->rules; r; r = r->next)
4860 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4861 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4867 printf(",%d.", x/1000);
4881 exim_exit(EXIT_SUCCESS);
4884 /* Handle a request to list one or more configuration options */
4885 /* If -n was set, we suppress some information */
4890 set_process_info("listing variables");
4891 if (recipients_arg >= argc)
4892 fail = !readconf_print(US"all", NULL, flag_n);
4893 else for (i = recipients_arg; i < argc; i++)
4896 (Ustrcmp(argv[i], "router") == 0 ||
4897 Ustrcmp(argv[i], "transport") == 0 ||
4898 Ustrcmp(argv[i], "authenticator") == 0 ||
4899 Ustrcmp(argv[i], "macro") == 0 ||
4900 Ustrcmp(argv[i], "environment") == 0))
4902 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4906 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4908 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4913 set_process_info("listing config");
4914 exim_exit(readconf_print(US"config", NULL, flag_n)
4915 ? EXIT_SUCCESS : EXIT_FAILURE);
4919 /* Initialise subsystems as required. */
4923 /* Handle a request to deliver one or more messages that are already on the
4924 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4925 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4927 Delivery of specific messages is typically used for a small number when
4928 prodding by hand (when the option forced_delivery will be set) or when
4929 re-execing to regain root privilege. Each message delivery must happen in a
4930 separate process, so we fork a process for each one, and run them sequentially
4931 so that debugging output doesn't get intertwined, and to avoid spawning too
4932 many processes if a long list is given. However, don't fork for the last one;
4933 this saves a process in the common case when Exim is called to deliver just one
4936 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4938 if (prod_requires_admin && !f.admin_user)
4940 fprintf(stderr, "exim: Permission denied\n");
4941 exim_exit(EXIT_FAILURE);
4943 set_process_info("delivering specified messages");
4944 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4945 for (i = msg_action_arg; i < argc; i++)
4949 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4950 that runs into a later copy into the untainted global message_id[] */
4951 /*XXX Do we need a length limit check here? */
4953 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4954 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4956 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4957 exim_underbar_exit(EXIT_SUCCESS);
4961 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4963 exim_exit(EXIT_FAILURE);
4967 exim_exit(EXIT_SUCCESS);
4971 /* If only a single queue run is requested, without SMTP listening, we can just
4972 turn into a queue runner, with an optional starting message id. */
4974 if (queue_interval == 0 && !f.daemon_listen)
4976 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4977 start_queue_run_id ? US" starting at " : US"",
4978 start_queue_run_id ? start_queue_run_id: US"",
4979 stop_queue_run_id ? US" stopping at " : US"",
4980 stop_queue_run_id ? stop_queue_run_id : US"");
4982 set_process_info("running the '%s' queue (single queue run)", queue_name);
4984 set_process_info("running the queue (single queue run)");
4985 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4986 exim_exit(EXIT_SUCCESS);
4990 /* Find the login name of the real user running this process. This is always
4991 needed when receiving a message, because it is written into the spool file. It
4992 may also be used to construct a from: or a sender: header, and in this case we
4993 need the user's full name as well, so save a copy of it, checked for RFC822
4994 syntax and munged if necessary, if it hasn't previously been set by the -F
4995 argument. We may try to get the passwd entry more than once, in case NIS or
4996 other delays are in evidence. Save the home directory for use in filter testing
5001 if ((pw = getpwuid(real_uid)) != NULL)
5003 originator_login = string_copy(US pw->pw_name);
5004 originator_home = string_copy(US pw->pw_dir);
5006 /* If user name has not been set by -F, set it from the passwd entry
5007 unless -f has been used to set the sender address by a trusted user. */
5009 if (!originator_name)
5011 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5013 uschar *name = US pw->pw_gecos;
5014 uschar *amp = Ustrchr(name, '&');
5017 /* Most Unix specify that a '&' character in the gecos field is
5018 replaced by a copy of the login name, and some even specify that
5019 the first character should be upper cased, so that's what we do. */
5024 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5025 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5026 buffer[loffset] = toupper(buffer[loffset]);
5030 /* If a pattern for matching the gecos field was supplied, apply
5031 it and then expand the name string. */
5033 if (gecos_pattern && gecos_name)
5035 const pcre2_code *re;
5036 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
5038 if (regex_match_and_setup(re, name, 0, -1))
5040 uschar *new_name = expand_string(gecos_name);
5044 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5045 "gecos field \"%s\"\n", new_name, name);
5048 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5049 "\"%s\": %s\n", gecos_name, expand_string_message);
5051 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5052 "gecos field \"%s\"\n", gecos_pattern, name);
5053 store_free((void *)re);
5055 originator_name = string_copy(name);
5058 /* A trusted caller has used -f but not -F */
5060 else originator_name = US"";
5063 /* Break the retry loop */
5068 if (++i > finduser_retries) break;
5072 /* If we cannot get a user login, log the incident and give up, unless the
5073 configuration specifies something to use. When running in the test harness,
5074 any setting of unknown_login overrides the actual name. */
5076 if (!originator_login || f.running_in_test_harness)
5080 originator_login = expand_string(unknown_login);
5081 if (!originator_name && unknown_username)
5082 originator_name = expand_string(unknown_username);
5083 if (!originator_name) originator_name = US"";
5085 if (!originator_login)
5086 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5090 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5093 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5095 /* If a message is created by this call of Exim, the uid/gid of its originator
5096 are those of the caller. These values are overridden if an existing message is
5097 read in from the spool. */
5099 originator_uid = real_uid;
5100 originator_gid = real_gid;
5102 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5103 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5105 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5106 returns. We leave this till here so that the originator_ fields are available
5107 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5110 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5114 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5115 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5116 "mua_wrapper is set");
5119 # ifndef DISABLE_TLS
5120 /* This also checks that the library linkage is working and we can call
5121 routines in it, so call even if tls_require_ciphers is unset */
5123 # ifdef MEASURE_TIMING
5124 struct timeval t0, diff;
5125 (void)gettimeofday(&t0, NULL);
5127 if (!tls_dropprivs_validate_require_cipher(FALSE))
5129 # ifdef MEASURE_TIMING
5130 report_time_since(&t0, US"validate_ciphers (delta)");
5138 /* If the sender ident has not been set (by a trusted caller) set it to
5139 the caller. This will get overwritten below for an inetd call. If a trusted
5140 caller has set it empty, unset it. */
5142 if (!sender_ident) sender_ident = originator_login;
5143 else if (!*sender_ident) sender_ident = NULL;
5145 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5146 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5147 originator_* variables set. */
5149 if (test_rewrite_arg >= 0)
5151 f.really_exim = FALSE;
5152 if (test_rewrite_arg >= argc)
5154 printf("-brw needs an address argument\n");
5155 exim_exit(EXIT_FAILURE);
5157 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5158 exim_exit(EXIT_SUCCESS);
5161 /* A locally-supplied message is considered to be coming from a local user
5162 unless a trusted caller supplies a sender address with -f, or is passing in the
5163 message via SMTP (inetd invocation or otherwise). */
5165 if ( !sender_address && !smtp_input
5166 || !f.trusted_caller && filter_test == FTEST_NONE)
5168 f.sender_local = TRUE;
5170 /* A trusted caller can supply authenticated_sender and authenticated_id
5171 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5172 defaults except when host checking. */
5174 if (!authenticated_sender && !host_checking)
5175 authenticated_sender = string_sprintf("%s@%s", originator_login,
5176 qualify_domain_sender);
5177 if (!authenticated_id && !host_checking)
5178 authenticated_id = originator_login;
5181 /* Trusted callers are always permitted to specify the sender address.
5182 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5183 is specified is the empty address. However, if a trusted caller does not
5184 specify a sender address for SMTP input, we leave sender_address unset. This
5185 causes the MAIL commands to be honoured. */
5187 if ( !smtp_input && !sender_address
5188 || !receive_check_set_sender(sender_address))
5190 /* Either the caller is not permitted to set a general sender, or this is
5191 non-SMTP input and the trusted caller has not set a sender. If there is no
5192 sender, or if a sender other than <> is set, override with the originator's
5193 login (which will get qualified below), except when checking things. */
5195 if ( !sender_address /* No sender_address set */
5197 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5198 !checking)) /* Not running tests, including filter tests */
5200 sender_address = originator_login;
5201 f.sender_address_forced = FALSE;
5202 sender_address_domain = 0;
5206 /* Remember whether an untrusted caller set the sender address */
5208 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5210 /* Ensure that the sender address is fully qualified unless it is the empty
5211 address, which indicates an error message, or doesn't exist (root caller, smtp
5212 interface, no -f argument). */
5214 if (sender_address && *sender_address && sender_address_domain == 0)
5215 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5216 qualify_domain_sender);
5218 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5220 /* Handle a request to verify a list of addresses, or test them for delivery.
5221 This must follow the setting of the sender address, since routers can be
5222 predicated upon the sender. If no arguments are given, read addresses from
5223 stdin. Set debug_level to at least D_v to get full output for address testing.
5226 if (verify_address_mode || f.address_test_mode)
5229 int flags = vopt_qualify;
5231 if (verify_address_mode)
5233 if (!verify_as_sender) flags |= vopt_is_recipient;
5234 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5239 flags |= vopt_is_recipient;
5240 debug_selector |= D_v;
5241 debug_file = stderr;
5242 debug_fd = fileno(debug_file);
5243 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5246 if (recipients_arg < argc)
5247 while (recipients_arg < argc)
5249 /* Supplied addresses are tainted since they come from a user */
5250 uschar * s = string_copy_taint(
5251 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5255 BOOL finished = FALSE;
5256 uschar *ss = parse_find_address_end(s, FALSE);
5257 if (*ss == ',') *ss = 0; else finished = TRUE;
5258 test_address(s, flags, &exit_value);
5261 while (*++s == ',' || isspace(*s)) ;
5267 uschar * s = get_stdinput(NULL, NULL);
5269 test_address(string_copy_taint(
5270 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5272 flags, &exit_value);
5276 exim_exit(exit_value);
5279 /* Handle expansion checking. Either expand items on the command line, or read
5280 from stdin if there aren't any. If -Mset was specified, load the message so
5281 that its variables can be used, but restrict this facility to admin users.
5282 Otherwise, if -bem was used, read a message from stdin. */
5286 dns_init(FALSE, FALSE, FALSE);
5287 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5291 exim_fail("exim: permission denied\n");
5292 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5293 /* Checking the length of the ID is sufficient to validate it.
5294 Get an untainted version so file opens can be done. */
5295 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5297 spoolname = string_sprintf("%s-H", message_id);
5298 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5299 printf ("Failed to load message datafile %s\n", message_id);
5300 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5301 printf ("Failed to load message %s\n", message_id);
5304 /* Read a test message from a file. We fudge it up to be on stdin, saving
5305 stdin itself for later reading of expansion strings. */
5307 else if (expansion_test_message)
5309 int save_stdin = dup(0);
5310 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5312 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5315 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5316 message_ended = END_NOTENDED;
5317 read_message_body(receive_msg(extract_recipients));
5318 message_linecount += body_linecount;
5319 (void)dup2(save_stdin, 0);
5320 (void)close(save_stdin);
5321 clearerr(stdin); /* Required by Darwin */
5324 /* Only admin users may see config-file macros this way */
5326 if (!f.admin_user) macros_user = macros = mlast = NULL;
5328 /* Allow $recipients for this testing */
5330 f.enable_dollar_recipients = TRUE;
5332 /* Expand command line items */
5334 if (recipients_arg < argc)
5335 while (recipients_arg < argc)
5336 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5342 char *(*fn_readline)(const char *) = NULL;
5343 void (*fn_addhist)(const char *) = NULL;
5347 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5350 while (s = get_stdinput(fn_readline, fn_addhist))
5351 expansion_test_line(s);
5354 if (dlhandle) dlclose(dlhandle);
5358 /* The data file will be open after -Mset */
5360 if (deliver_datafile >= 0)
5362 (void)close(deliver_datafile);
5363 deliver_datafile = -1;
5366 exim_exit(EXIT_SUCCESS);
5370 /* The active host name is normally the primary host name, but it can be varied
5371 for hosts that want to play several parts at once. We need to ensure that it is
5372 set for host checking, and for receiving messages. */
5374 smtp_active_hostname = primary_hostname;
5375 if (raw_active_hostname != NULL)
5377 uschar *nah = expand_string(raw_active_hostname);
5380 if (!f.expand_string_forcedfail)
5381 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5382 "(smtp_active_hostname): %s", raw_active_hostname,
5383 expand_string_message);
5385 else if (nah[0] != 0) smtp_active_hostname = nah;
5388 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5389 given IP address so that the blocking and relay configuration can be tested.
5390 Unless a sender_ident was set by -oMt, we discard it (the default is the
5391 caller's login name). An RFC 1413 call is made only if we are running in the
5392 test harness and an incoming interface and both ports are specified, because
5393 there is no TCP/IP call to find the ident for. */
5400 if (!sender_ident_set)
5402 sender_ident = NULL;
5403 if (f.running_in_test_harness && sender_host_port
5404 && interface_address && interface_port)
5405 verify_get_ident(1223); /* note hardwired port number */
5408 /* In case the given address is a non-canonical IPv6 address, canonicalize
5409 it. The code works for both IPv4 and IPv6, as it happens. */
5411 size = host_aton(sender_host_address, x);
5412 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5413 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5415 /* Now set up for testing */
5417 host_build_sender_fullhost();
5421 f.sender_local = FALSE;
5422 f.sender_host_notsocket = TRUE;
5423 debug_file = stderr;
5424 debug_fd = fileno(debug_file);
5425 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5426 "**** but without any ident (RFC 1413) callback.\n"
5427 "**** This is not for real!\n\n",
5428 sender_host_address);
5430 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5431 if (verify_check_host(&hosts_connection_nolog) == OK)
5433 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5434 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5436 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5438 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5439 because a log line has already been written for all its failure exists
5440 (usually "connection refused: <reason>") and writing another one is
5441 unnecessary clutter. */
5443 if (smtp_start_session())
5446 for (; (reset_point = store_mark()); store_reset(reset_point))
5448 if (smtp_setup_msg() <= 0) break;
5449 if (!receive_msg(FALSE)) break;
5451 return_path = sender_address = NULL;
5452 dnslist_domain = dnslist_matched = NULL;
5453 #ifndef DISABLE_DKIM
5454 dkim_cur_signer = NULL;
5457 deliver_localpart_orig = NULL;
5458 deliver_domain_orig = NULL;
5459 callout_address = sending_ip_address = NULL;
5460 deliver_localpart_data = deliver_domain_data =
5461 recipient_data = sender_data = NULL;
5462 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5466 exim_exit(EXIT_SUCCESS);
5470 /* Arrange for message reception if recipients or SMTP were specified;
5471 otherwise complain unless a version print (-bV) happened or this is a filter
5472 verification test or info dump.
5473 In the former case, show the configuration file name. */
5475 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5477 if (version_printed)
5479 if (Ustrchr(config_main_filelist, ':'))
5480 printf("Configuration file search path is %s\n", config_main_filelist);
5481 printf("Configuration file is %s\n", config_main_filename);
5482 return EXIT_SUCCESS;
5485 if (info_flag != CMDINFO_NONE)
5487 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5488 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5491 if (filter_test == FTEST_NONE)
5492 exim_usage(called_as);
5496 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5497 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5498 that we are not called from inetd, because that is rejected above. The
5499 following configuration settings are forced here:
5501 (1) Synchronous delivery (-odi)
5502 (2) Errors to stderr (-oep == -oeq)
5503 (3) No parallel remote delivery
5504 (4) Unprivileged delivery
5506 We don't force overall queueing options because there are several of them;
5507 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5508 to override any SMTP queueing. */
5512 f.synchronous_delivery = TRUE;
5513 arg_error_handling = ERRORS_STDERR;
5514 remote_max_parallel = 1;
5515 deliver_drop_privilege = TRUE;
5516 f.queue_smtp = FALSE;
5517 queue_smtp_domains = NULL;
5519 message_utf8_downconvert = -1; /* convert-if-needed */
5524 /* Prepare to accept one or more new messages on the standard input. When a
5525 message has been read, its id is returned in message_id[]. If doing immediate
5526 delivery, we fork a delivery process for each received message, except for the
5527 last one, where we can save a process switch.
5529 It is only in non-smtp mode that error_handling is allowed to be changed from
5530 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5531 sendmail error modes other than -oem ever actually used? Later: yes.) */
5533 if (!smtp_input) error_handling = arg_error_handling;
5535 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5536 logging being sent down the socket and make an identd call to get the
5539 else if (f.is_inetd)
5541 (void)fclose(stderr);
5542 exim_nullstd(); /* Re-open to /dev/null */
5543 verify_get_ident(IDENT_PORT);
5544 host_build_sender_fullhost();
5545 set_process_info("handling incoming connection from %s via inetd",
5549 /* If the sender host address has been set, build sender_fullhost if it hasn't
5550 already been done (which it will have been for inetd). This caters for the
5551 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5552 so that the test for IP options is skipped for -bs input. */
5554 if (sender_host_address && !sender_fullhost)
5556 host_build_sender_fullhost();
5557 set_process_info("handling incoming connection from %s via -oMa",
5559 f.sender_host_notsocket = TRUE;
5562 /* Otherwise, set the sender host as unknown except for inetd calls. This
5563 prevents host checking in the case of -bs not from inetd and also for -bS. */
5565 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5567 /* If stdout does not exist, then dup stdin to stdout. This can happen
5568 if exim is started from inetd. In this case fd 0 will be set to the socket,
5569 but fd 1 will not be set. This also happens for passed SMTP channels. */
5571 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5573 /* Set up the incoming protocol name and the state of the program. Root is
5574 allowed to force received protocol via the -oMr option above. If we have come
5575 via inetd, the process info has already been set up. We don't set
5576 received_protocol here for smtp input, as it varies according to
5577 batch/HELO/EHLO/AUTH/TLS. */
5581 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5582 smtp_batched_input? "batched " : "",
5583 sender_address ? sender_address : originator_login);
5587 int old_pool = store_pool;
5588 store_pool = POOL_PERM;
5589 if (!received_protocol)
5590 received_protocol = string_sprintf("local%s", called_as);
5591 store_pool = old_pool;
5592 set_process_info("accepting a local non-SMTP message from <%s>",
5596 /* Initialize the session_local_queue-only flag (this will be ignored if
5597 mua_wrapper is set) */
5600 session_local_queue_only = queue_only;
5602 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5603 the spool if so configured. On failure, we must not attempt to send an error
5604 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5605 error code is given.) */
5607 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5608 exim_fail("exim: insufficient disk space\n");
5610 /* If this is smtp input of any kind, real or batched, handle the start of the
5613 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5614 because a log line has already been written for all its failure exists
5615 (usually "connection refused: <reason>") and writing another one is
5616 unnecessary clutter. */
5622 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5623 if (verify_check_host(&hosts_connection_nolog) == OK)
5625 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5626 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5628 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5629 if (!smtp_start_session())
5632 exim_exit(EXIT_SUCCESS);
5636 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5637 (we handle buferring so as to have visibility of fill level). */
5641 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5642 if (expand_string_message)
5643 if (thismessage_size_limit == -1)
5644 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5645 "message_size_limit: %s", expand_string_message);
5647 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5648 "message_size_limit: %s", expand_string_message);
5650 setvbuf(stdin, NULL, _IONBF, 0);
5653 /* Loop for several messages when reading SMTP input. If we fork any child
5654 processes, we don't want to wait for them unless synchronous delivery is
5655 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5656 same as SIG_DFL, despite the fact that documentation often lists the default as
5657 "ignore". This is a confusing area. This is what I know:
5659 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5660 processes that complete simply to go away without ever becoming defunct. You
5661 can't then wait for them - but we don't want to wait for them in the
5662 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5663 happen for all OS (e.g. *BSD is different).
5665 But that's not the end of the story. Some (many? all?) systems have the
5666 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5667 has by default, so it seems that the difference is merely one of default
5668 (compare restarting vs non-restarting signals).
5670 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5671 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5672 of the loop below. Paranoia rules.
5674 February 2003: That's *still* not the end of the story. There are now versions
5675 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5676 process then calls waitpid(), a grumble is written to the system log, because
5677 this is logically inconsistent. In other words, it doesn't like the paranoia.
5678 As a consequence of this, the waitpid() below is now excluded if we are sure
5679 that SIG_IGN works. */
5681 if (!f.synchronous_delivery)
5684 struct sigaction act;
5685 act.sa_handler = SIG_IGN;
5686 sigemptyset(&(act.sa_mask));
5687 act.sa_flags = SA_NOCLDWAIT;
5688 sigaction(SIGCHLD, &act, NULL);
5690 signal(SIGCHLD, SIG_IGN);
5694 /* Save the current store pool point, for resetting at the start of
5695 each message, and save the real sender address, if any. */
5697 real_sender_address = sender_address;
5699 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5700 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5703 for (BOOL more = TRUE; more; )
5705 rmark reset_point = store_mark();
5708 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5709 input and build the recipients list, before calling receive_msg() to read the
5710 message proper. Whatever sender address is given in the SMTP transaction is
5711 often ignored for local senders - we use the actual sender, which is normally
5712 either the underlying user running this process or a -f argument provided by
5713 a trusted caller. It is saved in real_sender_address. The test for whether to
5714 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5719 if ((rc = smtp_setup_msg()) > 0)
5721 if (real_sender_address != NULL &&
5722 !receive_check_set_sender(sender_address))
5724 sender_address = raw_sender = real_sender_address;
5725 sender_address_unrewritten = NULL;
5728 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5729 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5730 the very end. The result of the ACL is ignored (as for other non-SMTP
5731 messages). It is run for its potential side effects. */
5733 if (smtp_batched_input && acl_not_smtp_start != NULL)
5735 uschar *user_msg, *log_msg;
5736 f.enable_dollar_recipients = TRUE;
5737 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5738 &user_msg, &log_msg);
5739 f.enable_dollar_recipients = FALSE;
5742 /* Now get the data for the message */
5744 more = receive_msg(extract_recipients);
5747 cancel_cutthrough_connection(TRUE, US"receive dropped");
5748 if (more) goto MORELOOP;
5749 smtp_log_no_mail(); /* Log no mail if configured */
5750 exim_exit(EXIT_FAILURE);
5755 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5756 smtp_log_no_mail(); /* Log no mail if configured */
5757 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5761 /* In the non-SMTP case, we have all the information from the command
5762 line, but must process it in case it is in the more general RFC822
5763 format, and in any case, to detect syntax errors. Also, it appears that
5764 the use of comma-separated lists as single arguments is common, so we
5765 had better support them. */
5770 int count = argc - recipients_arg;
5771 uschar **list = argv + recipients_arg;
5773 /* These options cannot be changed dynamically for non-SMTP messages */
5775 f.active_local_sender_retain = local_sender_retain;
5776 f.active_local_from_check = local_from_check;
5778 /* Save before any rewriting */
5780 raw_sender = string_copy(sender_address);
5782 /* Loop for each argument (supplied by user hence tainted) */
5784 for (int i = 0; i < count; i++)
5786 int start, end, domain;
5788 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5789 * We'll still want to cap it to something, just in case. */
5790 uschar * s = string_copy_taint(
5791 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5794 /* Loop for each comma-separated address */
5798 BOOL finished = FALSE;
5800 uschar *ss = parse_find_address_end(s, FALSE);
5802 if (*ss == ',') *ss = 0; else finished = TRUE;
5804 /* Check max recipients - if -t was used, these aren't recipients */
5806 if (recipients_max > 0 && ++rcount > recipients_max &&
5807 !extract_recipients)
5808 if (error_handling == ERRORS_STDERR)
5810 fprintf(stderr, "exim: too many recipients\n");
5811 exim_exit(EXIT_FAILURE);
5815 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5816 errors_sender_rc : EXIT_FAILURE;
5820 BOOL b = allow_utf8_domains;
5821 allow_utf8_domains = TRUE;
5824 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5828 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5829 else allow_utf8_domains = b;
5834 if (domain == 0 && !f.allow_unqualified_recipient)
5837 errmess = US"unqualified recipient address not allowed";
5841 if (error_handling == ERRORS_STDERR)
5843 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5844 string_printing(list[i]), errmess);
5845 exim_exit(EXIT_FAILURE);
5851 eblock.text1 = string_printing(list[i]);
5852 eblock.text2 = errmess;
5854 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5855 errors_sender_rc : EXIT_FAILURE;
5858 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5861 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5865 /* Show the recipients when debugging */
5869 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5870 if (recipients_list)
5872 debug_printf("Recipients:\n");
5873 for (int i = 0; i < recipients_count; i++)
5874 debug_printf(" %s\n", recipients_list[i].address);
5878 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5879 ignored; rejecting here would just add complication, and it can just as
5880 well be done later. Allow $recipients to be visible in the ACL. */
5882 if (acl_not_smtp_start)
5884 uschar *user_msg, *log_msg;
5885 f.enable_dollar_recipients = TRUE;
5886 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5887 &user_msg, &log_msg);
5888 f.enable_dollar_recipients = FALSE;
5891 /* Pause for a while waiting for input. If none received in that time,
5892 close the logfile, if we had one open; then if we wait for a long-running
5893 datasource (months, in one use-case) log rotation will not leave us holding
5896 if (!receive_timeout)
5897 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5900 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5901 will just read the headers for the message, and not write anything onto the
5904 message_ended = END_NOTENDED;
5905 more = receive_msg(extract_recipients);
5907 /* more is always FALSE here (not SMTP message) when reading a message
5908 for real; when reading the headers of a message for filter testing,
5909 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5911 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5912 } /* Non-SMTP message reception */
5914 /* If this is a filter testing run, there are headers in store, but
5915 no message on the spool. Run the filtering code in testing mode, setting
5916 the domain to the qualify domain and the local part to the current user,
5917 unless they have been set by options. The prefix and suffix are left unset
5918 unless specified. The the return path is set to to the sender unless it has
5919 already been set from a return-path header in the message. */
5921 if (filter_test != FTEST_NONE)
5923 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5924 deliver_domain_orig = deliver_domain;
5925 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5926 deliver_localpart_orig = deliver_localpart;
5927 deliver_localpart_prefix = US ftest_prefix;
5928 deliver_localpart_suffix = US ftest_suffix;
5929 deliver_home = originator_home;
5933 printf("Return-path copied from sender\n");
5934 return_path = string_copy(sender_address);
5937 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5938 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5940 receive_add_recipient(
5941 string_sprintf("%s%s%s@%s",
5942 ftest_prefix ? ftest_prefix : US"",
5944 ftest_suffix ? ftest_suffix : US"",
5945 deliver_domain), -1);
5947 printf("Recipient = %s\n", recipients_list[0].address);
5948 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5949 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5951 if (chdir("/")) /* Get away from wherever the user is running this from */
5953 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5954 exim_exit(EXIT_FAILURE);
5957 /* Now we run either a system filter test, or a user filter test, or both.
5958 In the latter case, headers added by the system filter will persist and be
5959 available to the user filter. We need to copy the filter variables
5962 if (filter_test & FTEST_SYSTEM)
5963 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5964 exim_exit(EXIT_FAILURE);
5966 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5968 if (filter_test & FTEST_USER)
5969 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5970 exim_exit(EXIT_FAILURE);
5972 exim_exit(EXIT_SUCCESS);
5975 /* Else act on the result of message reception. We should not get here unless
5976 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5977 will be TRUE. If it is not, check on the number of messages received in this
5980 if ( !session_local_queue_only
5981 && smtp_accept_queue_per_connection > 0
5982 && receive_messagecount > smtp_accept_queue_per_connection)
5984 session_local_queue_only = TRUE;
5985 queue_only_reason = 2;
5988 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5989 and queue_only_load is set, check that the load average is below it. If it is
5990 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5991 default), we put the whole session into queue_only mode. It then remains this
5992 way for any subsequent messages on the same SMTP connection. This is a
5993 deliberate choice; even though the load average may fall, it doesn't seem
5994 right to deliver later messages on the same call when not delivering earlier
5995 ones. However, there are odd cases where this is not wanted, so this can be
5996 changed by setting queue_only_load_latch false. */
5998 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5999 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
6001 queue_only_reason = 3;
6002 if (queue_only_load_latch) session_local_queue_only = TRUE;
6005 /* If running as an MUA wrapper, all queueing options and freezing options
6009 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6011 /* Log the queueing here, when it will get a message id attached, but
6012 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6015 if (local_queue_only)
6017 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6018 switch(queue_only_reason)
6021 log_write(L_delay_delivery,
6022 LOG_MAIN, "no immediate delivery: more than %d messages "
6023 "received in one connection", smtp_accept_queue_per_connection);
6027 log_write(L_delay_delivery,
6028 LOG_MAIN, "no immediate delivery: load average %.2f",
6029 (double)load_average/1000.0);
6034 else if (f.queue_only_policy || f.deliver_freeze)
6035 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6037 /* Else do the delivery unless the ACL or local_scan() called for queue only
6038 or froze the message. Always deliver in a separate process. A fork failure is
6039 not a disaster, as the delivery will eventually happen on a subsequent queue
6040 run. The search cache must be tidied before the fork, as the parent will
6041 do it before exiting. The child will trigger a lookup failure and
6042 thereby defer the delivery if it tries to use (for example) a cached ldap
6043 connection that the parent has called unbind on. */
6050 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6053 close_unwanted(); /* Close unwanted file descriptors and TLS */
6054 exim_nullstd(); /* Ensure std{in,out,err} exist */
6056 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6057 mode, deliver_drop_privilege is forced TRUE). */
6059 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6061 delivery_re_exec(CEE_EXEC_EXIT);
6062 /* Control does not return here. */
6065 /* No need to re-exec */
6067 rc = deliver_message(message_id, FALSE, FALSE);
6069 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6070 ? EXIT_SUCCESS : EXIT_FAILURE);
6075 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6076 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6077 "process: %s", strerror(errno));
6081 release_cutthrough_connection(US"msg passed for delivery");
6083 /* In the parent, wait if synchronous delivery is required. This will
6084 always be the case in MUA wrapper mode. */
6086 if (f.synchronous_delivery)
6089 while (wait(&status) != pid);
6090 if ((status & 0x00ff) != 0)
6091 log_write(0, LOG_MAIN|LOG_PANIC,
6092 "process %d crashed with signal %d while delivering %s",
6093 (int)pid, status & 0x00ff, message_id);
6094 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6099 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6100 automatically reaps children (see comments above the loop), clear away any
6101 finished subprocesses here, in case there are lots of messages coming in
6102 from the same source. */
6104 #ifndef SIG_IGN_WORKS
6105 while (waitpid(-1, NULL, WNOHANG) > 0);
6109 return_path = sender_address = NULL;
6110 authenticated_sender = NULL;
6111 deliver_localpart_orig = NULL;
6112 deliver_domain_orig = NULL;
6113 deliver_host = deliver_host_address = NULL;
6114 dnslist_domain = dnslist_matched = NULL;
6115 #ifdef WITH_CONTENT_SCAN
6116 malware_name = NULL;
6118 callout_address = NULL;
6119 sending_ip_address = NULL;
6120 deliver_localpart_data = deliver_domain_data =
6121 recipient_data = sender_data = NULL;
6123 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
6125 store_reset(reset_point);
6128 exim_exit(EXIT_SUCCESS); /* Never returns */
6129 return 0; /* To stop compiler warning */