src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.49 2006/11/13 11:56:41 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2006 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10
  11 /* The main function: entry point, initialization, and high-level control.
  12 Also a few functions that don't naturally fit elsewhere. */
  13
  14
  15 #include "exim.h"
  16
  17
  18
  19 /*************************************************
  20 *      Function interface to store functions     *
  21 *************************************************/
  22
  23 /* We need some real functions to pass to the PCRE regular expression library
  24 for store allocation via Exim's store manager. The normal calls are actually
  25 macros that pass over location information to make tracing easier. These
  26 functions just interface to the standard macro calls. A good compiler will
  27 optimize out the tail recursion and so not make them too expensive. There
  28 are two sets of functions; one for use when we want to retain the compiled
  29 regular expression for a long time; the other for short-term use. */
  30
  31 static void *
  32 function_store_get(size_t size)
  33 {
  34 return store_get((int)size);
  35 }
  36
  37 static void
  38 function_dummy_free(void *block) { block = block; }
  39
  40 static void *
  41 function_store_malloc(size_t size)
  42 {
  43 return store_malloc((int)size);
  44 }
  45
  46 static void
  47 function_store_free(void *block)
  48 {
  49 store_free(block);
  50 }
  51
  52
  53
  54
  55 /*************************************************
  56 *  Compile regular expression and panic on fail  *
  57 *************************************************/
  58
  59 /* This function is called when failure to compile a regular expression leads
  60 to a panic exit. In other cases, pcre_compile() is called directly. In many
  61 cases where this function is used, the results of the compilation are to be
  62 placed in long-lived store, so we temporarily reset the store management
  63 functions that PCRE uses if the use_malloc flag is set.
  64
  65 Argument:
  66   pattern     the pattern to compile
  67   caseless    TRUE if caseless matching is required
  68   use_malloc  TRUE if compile into malloc store
  69
  70 Returns:      pointer to the compiled pattern
  71 */
  72
  73 const pcre *
  74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
  75 {
  76 int offset;
  77 int options = PCRE_COPT;
  78 const pcre *yield;
  79 const uschar *error;
  80 if (use_malloc)
  81   {
  82   pcre_malloc = function_store_malloc;
  83   pcre_free = function_store_free;
  84   }
  85 if (caseless) options |= PCRE_CASELESS;
  86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
  87 pcre_malloc = function_store_get;
  88 pcre_free = function_dummy_free;
  89 if (yield == NULL)
  90   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
  91     "%s at offset %d while compiling %s", error, offset, pattern);
  92 return yield;
  93 }
  94
  95
  96
  97
  98 /*************************************************
  99 *   Execute regular expression and set strings   *
 100 *************************************************/
 101
 102 /* This function runs a regular expression match, and sets up the pointers to
 103 the matched substrings.
 104
 105 Arguments:
 106   re          the compiled expression
 107   subject     the subject string
 108   options     additional PCRE options
 109   setup       if < 0 do full setup
 110               if >= 0 setup from setup+1 onwards,
 111                 excluding the full matched string
 112
 113 Returns:      TRUE or FALSE
 114 */
 115
 116 BOOL
 117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
 118 {
 119 int ovector[3*(EXPAND_MAXN+1)];
 120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
 121   PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
 122 BOOL yield = n >= 0;
 123 if (n == 0) n = EXPAND_MAXN + 1;
 124 if (yield)
 125   {
 126   int nn;
 127   expand_nmax = (setup < 0)? 0 : setup + 1;
 128   for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
 129     {
 130     expand_nstring[expand_nmax] = subject + ovector[nn];
 131     expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
 132     }
 133   expand_nmax--;
 134   }
 135 return yield;
 136 }
 137
 138
 139
 140
 141 /*************************************************
 142 *             Handler for SIGUSR1                *
 143 *************************************************/
 144
 145 /* SIGUSR1 causes any exim process to write to the process log details of
 146 what it is currently doing. It will only be used if the OS is capable of
 147 setting up a handler that causes automatic restarting of any system call
 148 that is in progress at the time.
 149
 150 Argument: the signal number (SIGUSR1)
 151 Returns:  nothing
 152 */
 153
 154 static void
 155 usr1_handler(int sig)
 156 {
 157 sig = sig;      /* Keep picky compilers happy */
 158 log_write(0, LOG_PROCESS, "%s", process_info);
 159 log_close_all();
 160 os_restarting_signal(SIGUSR1, usr1_handler);
 161 }
 162
 163
 164
 165 /*************************************************
 166 *             Timeout handler                    *
 167 *************************************************/
 168
 169 /* This handler is enabled most of the time that Exim is running. The handler
 170 doesn't actually get used unless alarm() has been called to set a timer, to
 171 place a time limit on a system call of some kind. When the handler is run, it
 172 re-enables itself.
 173
 174 There are some other SIGALRM handlers that are used in special cases when more
 175 than just a flag setting is required; for example, when reading a message's
 176 input. These are normally set up in the code module that uses them, and the
 177 SIGALRM handler is reset to this one afterwards.
 178
 179 Argument: the signal value (SIGALRM)
 180 Returns:  nothing
 181 */
 182
 183 void
 184 sigalrm_handler(int sig)
 185 {
 186 sig = sig;      /* Keep picky compilers happy */
 187 sigalrm_seen = TRUE;
 188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
 189 }
 190
 191
 192
 193 /*************************************************
 194 *      Sleep for a fractional time interval      *
 195 *************************************************/
 196
 197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
 198 period of time that may include a fraction of a second. The coding is somewhat
 199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
 200 will wait for ever, so we panic in this instance. (There was a case of this
 201 when a bug in a function that calls milliwait() caused it to pass invalid data.
 202 That's when I added the check. :-)
 203
 204 Argument:  an itimerval structure containing the interval
 205 Returns:   nothing
 206 */
 207
 208 static void
 209 milliwait(struct itimerval *itval)
 210 {
 211 sigset_t sigmask;
 212 sigset_t old_sigmask;
 213 (void)sigemptyset(&sigmask);                           /* Empty mask */
 214 (void)sigaddset(&sigmask, SIGALRM);                    /* Add SIGALRM */
 215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask);  /* Block SIGALRM */
 216 if (setitimer(ITIMER_REAL, itval, NULL) < 0)           /* Start timer */
 217   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
 218     "setitimer() failed: %s", strerror(errno));
 219 (void)sigfillset(&sigmask);                            /* All signals */
 220 (void)sigdelset(&sigmask, SIGALRM);                    /* Remove SIGALRM */
 221 (void)sigsuspend(&sigmask);                            /* Until SIGALRM */
 222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL);    /* Restore mask */
 223 }
 224
 225
 226
 227
 228 /*************************************************
 229 *         Millisecond sleep function             *
 230 *************************************************/
 231
 232 /* The basic sleep() function has a granularity of 1 second, which is too rough
 233 in some cases - for example, when using an increasing delay to slow down
 234 spammers.
 235
 236 Argument:    number of millseconds
 237 Returns:     nothing
 238 */
 239
 240 void
 241 millisleep(int msec)
 242 {
 243 struct itimerval itval;
 244 itval.it_interval.tv_sec = 0;
 245 itval.it_interval.tv_usec = 0;
 246 itval.it_value.tv_sec = msec/1000;
 247 itval.it_value.tv_usec = (msec % 1000) * 1000;
 248 milliwait(&itval);
 249 }
 250
 251
 252
 253 /*************************************************
 254 *         Compare microsecond times              *
 255 *************************************************/
 256
 257 /*
 258 Arguments:
 259   tv1         the first time
 260   tv2         the second time
 261
 262 Returns:      -1, 0, or +1
 263 */
 264
 265 int
 266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
 267 {
 268 if (t1->tv_sec > t2->tv_sec) return +1;
 269 if (t1->tv_sec < t2->tv_sec) return -1;
 270 if (t1->tv_usec > t2->tv_usec) return +1;
 271 if (t1->tv_usec < t2->tv_usec) return -1;
 272 return 0;
 273 }
 274
 275
 276
 277
 278 /*************************************************
 279 *          Clock tick wait function              *
 280 *************************************************/
 281
 282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
 283 message IDs, and in file names for maildir deliveries. Because some OS now
 284 re-use pids within the same second, sub-second times are now being used.
 285 However, for absolute certaintly, we must ensure the clock has ticked before
 286 allowing the relevant process to complete. At the time of implementation of
 287 this code (February 2003), the speed of processors is such that the clock will
 288 invariably have ticked already by the time a process has done its job. This
 289 function prepares for the time when things are faster - and it also copes with
 290 clocks that go backwards.
 291
 292 Arguments:
 293   then_tv      A timeval which was used to create uniqueness; its usec field
 294                  has been rounded down to the value of the resolution.
 295                  We want to be sure the current time is greater than this.
 296   resolution   The resolution that was used to divide the microseconds
 297                  (1 for maildir, larger for message ids)
 298
 299 Returns:       nothing
 300 */
 301
 302 void
 303 exim_wait_tick(struct timeval *then_tv, int resolution)
 304 {
 305 struct timeval now_tv;
 306 long int now_true_usec;
 307
 308 (void)gettimeofday(&now_tv, NULL);
 309 now_true_usec = now_tv.tv_usec;
 310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
 311
 312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
 313   {
 314   struct itimerval itval;
 315   itval.it_interval.tv_sec = 0;
 316   itval.it_interval.tv_usec = 0;
 317   itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
 318   itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
 319
 320   /* We know that, overall, "now" is less than or equal to "then". Therefore, a
 321   negative value for the microseconds is possible only in the case when "now"
 322   is more than a second less than "then". That means that itval.it_value.tv_sec
 323   is greater than zero. The following correction is therefore safe. */
 324
 325   if (itval.it_value.tv_usec < 0)
 326     {
 327     itval.it_value.tv_usec += 1000000;
 328     itval.it_value.tv_sec -= 1;
 329     }
 330
 331   DEBUG(D_transport|D_receive)
 332     {
 333     if (!running_in_test_harness)
 334       {
 335       debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
 336         then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
 337       debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
 338         itval.it_value.tv_usec);
 339       }
 340     }
 341
 342   milliwait(&itval);
 343   }
 344 }
 345
 346
 347
 348
 349 /*************************************************
 350 *            Set up processing details           *
 351 *************************************************/
 352
 353 /* Save a text string for dumping when SIGUSR1 is received.
 354 Do checks for overruns.
 355
 356 Arguments: format and arguments, as for printf()
 357 Returns:   nothing
 358 */
 359
 360 void
 361 set_process_info(char *format, ...)
 362 {
 363 int len;
 364 va_list ap;
 365 sprintf(CS process_info, "%5d ", (int)getpid());
 366 len = Ustrlen(process_info);
 367 va_start(ap, format);
 368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
 369   Ustrcpy(process_info + len, "**** string overflowed buffer ****");
 370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
 371 va_end(ap);
 372 }
 373
 374
 375
 376
 377
 378 /*************************************************
 379 *   Call fopen() with umask 777 and adjust mode  *
 380 *************************************************/
 381
 382 /* Exim runs with umask(0) so that files created with open() have the mode that
 383 is specified in the open() call. However, there are some files, typically in
 384 the spool directory, that are created with fopen(). They end up world-writeable
 385 if no precautions are taken. Although the spool directory is not accessible to
 386 the world, this is an untidiness. So this is a wrapper function for fopen()
 387 that sorts out the mode of the created file.
 388
 389 Arguments:
 390    filename       the file name
 391    options        the fopen() options
 392    mode           the required mode
 393
 394 Returns:          the fopened FILE or NULL
 395 */
 396
 397 FILE *
 398 modefopen(uschar *filename, char *options, mode_t mode)
 399 {
 400 mode_t saved_umask = umask(0777);
 401 FILE *f = Ufopen(filename, options);
 402 (void)umask(saved_umask);
 403 if (f != NULL) (void)fchmod(fileno(f), mode);
 404 return f;
 405 }
 406
 407
 408
 409
 410 /*************************************************
 411 *   Ensure stdin, stdout, and stderr exist       *
 412 *************************************************/
 413
 414 /* Some operating systems grumble if an exec() happens without a standard
 415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 416 file will be opened and will use these fd values, and then some other bit of
 417 code will assume, for example, that it can write error messages to stderr.
 418 This function ensures that fds 0, 1, and 2 are open if they do not already
 419 exist, by connecting them to /dev/null.
 420
 421 This function is also used to ensure that std{in,out,err} exist at all times,
 422 so that if any library that Exim calls tries to use them, it doesn't crash.
 423
 424 Arguments:  None
 425 Returns:    Nothing
 426 */
 427
 428 void
 429 exim_nullstd(void)
 430 {
 431 int i;
 432 int devnull = -1;
 433 struct stat statbuf;
 434 for (i = 0; i <= 2; i++)
 435   {
 436   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 437     {
 438     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 439     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 440       string_open_failed(errno, "/dev/null"));
 441     if (devnull != i) (void)dup2(devnull, i);
 442     }
 443   }
 444 if (devnull > 2) (void)close(devnull);
 445 }
 446
 447
 448
 449
 450 /*************************************************
 451 *   Close unwanted file descriptors for delivery *
 452 *************************************************/
 453
 454 /* This function is called from a new process that has been forked to deliver
 455 an incoming message, either directly, or using exec.
 456
 457 We want any smtp input streams to be closed in this new process. However, it
 458 has been observed that using fclose() here causes trouble. When reading in -bS
 459 input, duplicate copies of messages have been seen. The files will be sharing a
 460 file pointer with the parent process, and it seems that fclose() (at least on
 461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
 462 least sometimes. Hence we go for closing the underlying file descriptors.
 463
 464 If TLS is active, we want to shut down the TLS library, but without molesting
 465 the parent's SSL connection.
 466
 467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
 468 stderr unless debugging) because the calling process might have set them up as
 469 pipes and be waiting for them to close before it waits for the submission
 470 process to terminate. If they aren't closed, they hold up the calling process
 471 until the initial delivery process finishes, which is not what we want.
 472
 473 Exception: We do want it for synchronous delivery!
 474
 475 And notwithstanding all the above, if D_resolver is set, implying resolver
 476 debugging, leave stdout open, because that's where the resolver writes its
 477 debugging output.
 478
 479 When we close stderr (which implies we've also closed stdout), we also get rid
 480 of any controlling terminal.
 481
 482 Arguments:   None
 483 Returns:     Nothing
 484 */
 485
 486 static void
 487 close_unwanted(void)
 488 {
 489 if (smtp_input)
 490   {
 491   #ifdef SUPPORT_TLS
 492   tls_close(FALSE);      /* Shut down the TLS library */
 493   #endif
 494   (void)close(fileno(smtp_in));
 495   (void)close(fileno(smtp_out));
 496   smtp_in = NULL;
 497   }
 498 else
 499   {
 500   (void)close(0);                                          /* stdin */
 501   if ((debug_selector & D_resolver) == 0) (void)close(1);  /* stdout */
 502   if (debug_selector == 0)                                 /* stderr */
 503     {
 504     if (!synchronous_delivery)
 505       {
 506       (void)close(2);
 507       log_stderr = NULL;
 508       }
 509     (void)setsid();
 510     }
 511   }
 512 }
 513
 514
 515
 516
 517 /*************************************************
 518 *          Set uid and gid                       *
 519 *************************************************/
 520
 521 /* This function sets a new uid and gid permanently, optionally calling
 522 initgroups() to set auxiliary groups. There are some special cases when running
 523 Exim in unprivileged modes. In these situations the effective uid will not be
 524 root; if we already have the right effective uid/gid, and don't need to
 525 initialize any groups, leave things as they are.
 526
 527 Arguments:
 528   uid        the uid
 529   gid        the gid
 530   igflag     TRUE if initgroups() wanted
 531   msg        text to use in debugging output and failure log
 532
 533 Returns:     nothing; bombs out on failure
 534 */
 535
 536 void
 537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
 538 {
 539 uid_t euid = geteuid();
 540 gid_t egid = getegid();
 541
 542 if (euid == root_uid || euid != uid || egid != gid || igflag)
 543   {
 544   /* At least one OS returns +1 for initgroups failure, so just check for
 545   non-zero. */
 546
 547   if (igflag)
 548     {
 549     struct passwd *pw = getpwuid(uid);
 550     if (pw != NULL)
 551       {
 552       if (initgroups(pw->pw_name, gid) != 0)
 553         log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
 554           (long int)uid, strerror(errno));
 555       }
 556     else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
 557       "no passwd entry for uid=%ld", (long int)uid);
 558     }
 559
 560   if (setgid(gid) < 0 || setuid(uid) < 0)
 561     {
 562     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
 563       "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
 564     }
 565   }
 566
 567 /* Debugging output included uid/gid and all groups */
 568
 569 DEBUG(D_uid)
 570   {
 571   int group_count;
 572   gid_t group_list[NGROUPS_MAX];
 573   debug_printf("changed uid/gid: %s\n  uid=%ld gid=%ld pid=%ld\n", msg,
 574     (long int)geteuid(), (long int)getegid(), (long int)getpid());
 575   group_count = getgroups(NGROUPS_MAX, group_list);
 576   debug_printf("  auxiliary group list:");
 577   if (group_count > 0)
 578     {
 579     int i;
 580     for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
 581     }
 582   else debug_printf(" <none>");
 583   debug_printf("\n");
 584   }
 585 }
 586
 587
 588
 589
 590 /*************************************************
 591 *               Exit point                       *
 592 *************************************************/
 593
 594 /* Exim exits via this function so that it always clears up any open
 595 databases.
 596
 597 Arguments:
 598   rc         return code
 599
 600 Returns:     does not return
 601 */
 602
 603 void
 604 exim_exit(int rc)
 605 {
 606 search_tidyup();
 607 DEBUG(D_any)
 608   debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
 609     ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
 610 exit(rc);
 611 }
 612
 613
 614
 615
 616 /*************************************************
 617 *         Extract port from host address         *
 618 *************************************************/
 619
 620 /* Called to extract the port from the values given to -oMa and -oMi.
 621 It also checks the syntax of the address, and terminates it before the
 622 port data when a port is extracted.
 623
 624 Argument:
 625   address   the address, with possible port on the end
 626
 627 Returns:    the port, or zero if there isn't one
 628             bombs out on a syntax error
 629 */
 630
 631 static int
 632 check_port(uschar *address)
 633 {
 634 int port = host_address_extract_port(address);
 635 if (string_is_ip_address(address, NULL) == 0)
 636   {
 637   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 638   exit(EXIT_FAILURE);
 639   }
 640 return port;
 641 }
 642
 643
 644
 645 /*************************************************
 646 *              Test/verify an address            *
 647 *************************************************/
 648
 649 /* This function is called by the -bv and -bt code. It extracts a working
 650 address from a full RFC 822 address. This isn't really necessary per se, but it
 651 has the effect of collapsing source routes.
 652
 653 Arguments:
 654   s            the address string
 655   flags        flag bits for verify_address()
 656   exit_value   to be set for failures
 657
 658 Returns:       nothing
 659 */
 660
 661 static void
 662 test_address(uschar *s, int flags, int *exit_value)
 663 {
 664 int start, end, domain;
 665 uschar *parse_error = NULL;
 666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 667   FALSE);
 668 if (address == NULL)
 669   {
 670   fprintf(stdout, "syntax error: %s\n", parse_error);
 671   *exit_value = 2;
 672   }
 673 else
 674   {
 675   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 676     -1, -1, NULL, NULL, NULL);
 677   if (rc == FAIL) *exit_value = 2;
 678     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 679   }
 680 }
 681
 682
 683
 684 /*************************************************
 685 *         Decode bit settings for log/debug      *
 686 *************************************************/
 687
 688 /* This function decodes a string containing bit settings in the form of +name
 689 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
 690 also recognizes a numeric setting of the form =<number>, but this is not
 691 intended for user use. It's an easy way for Exim to pass the debug settings
 692 when it is re-exec'ed.
 693
 694 The log options are held in two unsigned ints (because there became too many
 695 for one). The top bit in the table means "put in 2nd selector". This does not
 696 yet apply to debug options, so the "=" facility sets only the first selector.
 697
 698 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
 699 It sets all the bits in both selectors. However, there is a facility for then
 700 unsetting certain bits, because we want to turn off "memory" in the debug case.
 701
 702 A bad value for a debug setting is treated as an unknown option - error message
 703 to stderr and die. For log settings, which come from the configuration file,
 704 we write to the log on the way out...
 705
 706 Arguments:
 707   selector1      address of the first bit string
 708   selector2      address of the second bit string, or NULL
 709   notall1        bits to exclude from "all" for selector1
 710   notall2        bits to exclude from "all" for selector2
 711   string         the configured string
 712   options        the table of option names
 713   count          size of table
 714   which          "log" or "debug"
 715
 716 Returns:         nothing on success - bomb out on failure
 717 */
 718
 719 static void
 720 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
 721   int notall2, uschar *string, bit_table *options, int count, uschar *which)
 722 {
 723 uschar *errmsg;
 724 if (string == NULL) return;
 725
 726 if (*string == '=')
 727   {
 728   char *end;    /* Not uschar */
 729   *selector1 = strtoul(CS string+1, &end, 0);
 730   if (*end == 0) return;
 731   errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
 732     string);
 733   goto ERROR_RETURN;
 734   }
 735
 736 /* Handle symbolic setting */
 737
 738 else for(;;)
 739   {
 740   BOOL adding;
 741   uschar *s;
 742   int len;
 743   bit_table *start, *end;
 744
 745   while (isspace(*string)) string++;
 746   if (*string == 0) return;
 747
 748   if (*string != '+' && *string != '-')
 749     {
 750     errmsg = string_sprintf("malformed %s_selector setting: "
 751       "+ or - expected but found \"%s\"", which, string);
 752     goto ERROR_RETURN;
 753     }
 754
 755   adding = *string++ == '+';
 756   s = string;
 757   while (isalnum(*string) || *string == '_') string++;
 758   len = string - s;
 759
 760   start = options;
 761   end = options + count;
 762
 763   while (start < end)
 764     {
 765     bit_table *middle = start + (end - start)/2;
 766     int c = Ustrncmp(s, middle->name, len);
 767     if (c == 0)
 768       {
 769       if (middle->name[len] != 0) c = -1; else
 770         {
 771         unsigned int bit = middle->bit;
 772         unsigned int *selector;
 773
 774         /* The value with all bits set means "force all bits in both selectors"
 775         in the case where two are being handled. However, the top bit in the
 776         second selector is never set. When setting, some bits can be excluded.
 777         */
 778
 779         if (bit == 0xffffffff)
 780           {
 781           if (adding)
 782             {
 783             *selector1 = 0xffffffff ^ notall1;
 784             if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
 785             }
 786           else
 787             {
 788             *selector1 = 0;
 789             if (selector2 != NULL) *selector2 = 0;
 790             }
 791           }
 792
 793         /* Otherwise, the 0x80000000 bit means "this value, without the top
 794         bit, belongs in the second selector". */
 795
 796         else
 797           {
 798           if ((bit & 0x80000000) != 0)
 799             {
 800             selector = selector2;
 801             bit &= 0x7fffffff;
 802             }
 803           else selector = selector1;
 804           if (adding) *selector |= bit; else *selector &= ~bit;
 805           }
 806         break;  /* Out of loop to match selector name */
 807         }
 808       }
 809     if (c < 0) end = middle; else start = middle + 1;
 810     }  /* Loop to match selector name */
 811
 812   if (start >= end)
 813     {
 814     errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
 815       adding? '+' : '-', len, s);
 816     goto ERROR_RETURN;
 817     }
 818   }    /* Loop for selector names */
 819
 820 /* Handle disasters */
 821
 822 ERROR_RETURN:
 823 if (Ustrcmp(which, "debug") == 0)
 824   {
 825   fprintf(stderr, "exim: %s\n", errmsg);
 826   exit(EXIT_FAILURE);
 827   }
 828 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
 829 }
 830
 831
 832
 833 /*************************************************
 834 *          Show supported features               *
 835 *************************************************/
 836
 837 /* This function is called for -bV and for -d to output the optional features
 838 of the current Exim binary.
 839
 840 Arguments:  a FILE for printing
 841 Returns:    nothing
 842 */
 843
 844 static void
 845 show_whats_supported(FILE *f)
 846 {
 847 #ifdef DB_VERSION_STRING
 848 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 849 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 850   #ifdef USE_DB
 851   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 852   #else
 853   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 854   #endif
 855 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 856 fprintf(f, "Probably ndbm\n");
 857 #elif defined(USE_TDB)
 858 fprintf(f, "Using tdb\n");
 859 #else
 860   #ifdef USE_GDBM
 861   fprintf(f, "Probably GDBM (native mode)\n");
 862   #else
 863   fprintf(f, "Probably GDBM (compatibility mode)\n");
 864   #endif
 865 #endif
 866
 867 fprintf(f, "Support for:");
 868 #ifdef SUPPORT_CRYPTEQ
 869   fprintf(f, " crypteq");
 870 #endif
 871 #if HAVE_ICONV
 872   fprintf(f, " iconv()");
 873 #endif
 874 #if HAVE_IPV6
 875   fprintf(f, " IPv6");
 876 #endif
 877 #ifdef HAVE_SETCLASSRESOURCES
 878   fprintf(f, " use_setclassresources");
 879 #endif
 880 #ifdef SUPPORT_PAM
 881   fprintf(f, " PAM");
 882 #endif
 883 #ifdef EXIM_PERL
 884   fprintf(f, " Perl");
 885 #endif
 886 #ifdef EXPAND_DLFUNC
 887   fprintf(f, " Expand_dlfunc");
 888 #endif
 889 #ifdef USE_TCP_WRAPPERS
 890   fprintf(f, " TCPwrappers");
 891 #endif
 892 #ifdef SUPPORT_TLS
 893   #ifdef USE_GNUTLS
 894   fprintf(f, " GnuTLS");
 895   #else
 896   fprintf(f, " OpenSSL");
 897   #endif
 898 #endif
 899 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
 900   fprintf(f, " translate_ip_address");
 901 #endif
 902 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 903   fprintf(f, " move_frozen_messages");
 904 #endif
 905 #ifdef WITH_CONTENT_SCAN
 906   fprintf(f, " Content_Scanning");
 907 #endif
 908 #ifdef WITH_OLD_DEMIME
 909   fprintf(f, " Old_Demime");
 910 #endif
 911 #ifdef EXPERIMENTAL_SPF
 912   fprintf(f, " Experimental_SPF");
 913 #endif
 914 #ifdef EXPERIMENTAL_SRS
 915   fprintf(f, " Experimental_SRS");
 916 #endif
 917 #ifdef EXPERIMENTAL_BRIGHTMAIL
 918   fprintf(f, " Experimental_Brightmail");
 919 #endif
 920 #ifdef EXPERIMENTAL_DOMAINKEYS
 921   fprintf(f, " Experimental_DomainKeys");
 922 #endif
 923 fprintf(f, "\n");
 924
 925 fprintf(f, "Lookups:");
 926 #ifdef LOOKUP_LSEARCH
 927   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 928 #endif
 929 #ifdef LOOKUP_CDB
 930   fprintf(f, " cdb");
 931 #endif
 932 #ifdef LOOKUP_DBM
 933   fprintf(f, " dbm dbmnz");
 934 #endif
 935 #ifdef LOOKUP_DNSDB
 936   fprintf(f, " dnsdb");
 937 #endif
 938 #ifdef LOOKUP_DSEARCH
 939   fprintf(f, " dsearch");
 940 #endif
 941 #ifdef LOOKUP_IBASE
 942   fprintf(f, " ibase");
 943 #endif
 944 #ifdef LOOKUP_LDAP
 945   fprintf(f, " ldap ldapdn ldapm");
 946 #endif
 947 #ifdef LOOKUP_MYSQL
 948   fprintf(f, " mysql");
 949 #endif
 950 #ifdef LOOKUP_NIS
 951   fprintf(f, " nis nis0");
 952 #endif
 953 #ifdef LOOKUP_NISPLUS
 954   fprintf(f, " nisplus");
 955 #endif
 956 #ifdef LOOKUP_ORACLE
 957   fprintf(f, " oracle");
 958 #endif
 959 #ifdef LOOKUP_PASSWD
 960   fprintf(f, " passwd");
 961 #endif
 962 #ifdef LOOKUP_PGSQL
 963   fprintf(f, " pgsql");
 964 #endif
 965 #ifdef LOOKUP_SQLITE
 966   fprintf(f, " sqlite");
 967 #endif
 968 #ifdef LOOKUP_TESTDB
 969   fprintf(f, " testdb");
 970 #endif
 971 #ifdef LOOKUP_WHOSON
 972   fprintf(f, " whoson");
 973 #endif
 974 fprintf(f, "\n");
 975
 976 fprintf(f, "Authenticators:");
 977 #ifdef AUTH_CRAM_MD5
 978   fprintf(f, " cram_md5");
 979 #endif
 980 #ifdef AUTH_CYRUS_SASL
 981   fprintf(f, " cyrus_sasl");
 982 #endif
 983 #ifdef AUTH_DOVECOT
 984   fprintf(f, " dovecot");
 985 #endif
 986 #ifdef AUTH_PLAINTEXT
 987   fprintf(f, " plaintext");
 988 #endif
 989 #ifdef AUTH_SPA
 990   fprintf(f, " spa");
 991 #endif
 992 fprintf(f, "\n");
 993
 994 fprintf(f, "Routers:");
 995 #ifdef ROUTER_ACCEPT
 996   fprintf(f, " accept");
 997 #endif
 998 #ifdef ROUTER_DNSLOOKUP
 999   fprintf(f, " dnslookup");
1000 #endif
1001 #ifdef ROUTER_IPLITERAL
1002   fprintf(f, " ipliteral");
1003 #endif
1004 #ifdef ROUTER_IPLOOKUP
1005   fprintf(f, " iplookup");
1006 #endif
1007 #ifdef ROUTER_MANUALROUTE
1008   fprintf(f, " manualroute");
1009 #endif
1010 #ifdef ROUTER_QUERYPROGRAM
1011   fprintf(f, " queryprogram");
1012 #endif
1013 #ifdef ROUTER_REDIRECT
1014   fprintf(f, " redirect");
1015 #endif
1016 fprintf(f, "\n");
1017
1018 fprintf(f, "Transports:");
1019 #ifdef TRANSPORT_APPENDFILE
1020   fprintf(f, " appendfile");
1021   #ifdef SUPPORT_MAILDIR
1022     fprintf(f, "/maildir");
1023   #endif
1024   #ifdef SUPPORT_MAILSTORE
1025     fprintf(f, "/mailstore");
1026   #endif
1027   #ifdef SUPPORT_MBX
1028     fprintf(f, "/mbx");
1029   #endif
1030 #endif
1031 #ifdef TRANSPORT_AUTOREPLY
1032   fprintf(f, " autoreply");
1033 #endif
1034 #ifdef TRANSPORT_LMTP
1035   fprintf(f, " lmtp");
1036 #endif
1037 #ifdef TRANSPORT_PIPE
1038   fprintf(f, " pipe");
1039 #endif
1040 #ifdef TRANSPORT_SMTP
1041   fprintf(f, " smtp");
1042 #endif
1043 fprintf(f, "\n");
1044
1045 if (fixed_never_users[0] > 0)
1046   {
1047   int i;
1048   fprintf(f, "Fixed never_users: ");
1049   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1050     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1051   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1052   }
1053
1054 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1055 }
1056
1057
1058
1059
1060 /*************************************************
1061 *               Quote a local part               *
1062 *************************************************/
1063
1064 /* This function is used when a sender address or a From: or Sender: header
1065 line is being created from the caller's login, or from an authenticated_id. It
1066 applies appropriate quoting rules for a local part.
1067
1068 Argument:    the local part
1069 Returns:     the local part, quoted if necessary
1070 */
1071
1072 uschar *
1073 local_part_quote(uschar *lpart)
1074 {
1075 BOOL needs_quote = FALSE;
1076 int size, ptr;
1077 uschar *yield;
1078 uschar *t;
1079
1080 for (t = lpart; !needs_quote && *t != 0; t++)
1081   {
1082   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1083     (*t != '.' || t == lpart || t[1] == 0);
1084   }
1085
1086 if (!needs_quote) return lpart;
1087
1088 size = ptr = 0;
1089 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1090
1091 for (;;)
1092   {
1093   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1094   if (nq == NULL)
1095     {
1096     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1097     break;
1098     }
1099   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1100   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1101   yield = string_cat(yield, &size, &ptr, nq, 1);
1102   lpart = nq + 1;
1103   }
1104
1105 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1106 yield[ptr] = 0;
1107 return yield;
1108 }
1109
1110
1111
1112 #ifdef USE_READLINE
1113 /*************************************************
1114 *         Load readline() functions              *
1115 *************************************************/
1116
1117 /* This function is called from testing executions that read data from stdin,
1118 but only when running as the calling user. Currently, only -be does this. The
1119 function loads the readline() function library and passes back the functions.
1120 On some systems, it needs the curses library, so load that too, but try without
1121 it if loading fails. All this functionality has to be requested at build time.
1122
1123 Arguments:
1124   fn_readline_ptr   pointer to where to put the readline pointer
1125   fn_addhist_ptr    pointer to where to put the addhistory function
1126
1127 Returns:            the dlopen handle or NULL on failure
1128 */
1129
1130 static void *
1131 set_readline(char * (**fn_readline_ptr)(char *),
1132              char * (**fn_addhist_ptr)(char *))
1133 {
1134 void *dlhandle;
1135 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1136
1137 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1138 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1139
1140 if (dlhandle != NULL)
1141   {
1142   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1143   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1144   }
1145 else
1146   {
1147   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1148   }
1149
1150 return dlhandle;
1151 }
1152 #endif
1153
1154
1155
1156 /*************************************************
1157 *    Get a line from stdin for testing things    *
1158 *************************************************/
1159
1160 /* This function is called when running tests that can take a number of lines
1161 of input (for example, -be and -bt). It handles continuations and trailing
1162 spaces. And prompting and a blank line output on eof. If readline() is in use,
1163 the arguments are non-NULL and provide the relevant functions.
1164
1165 Arguments:
1166   fn_readline   readline function or NULL
1167   fn_addhist    addhist function or NULL
1168
1169 Returns:        pointer to dynamic memory, or NULL at end of file
1170 */
1171
1172 static uschar *
1173 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1174 {
1175 int i;
1176 int size = 0;
1177 int ptr = 0;
1178 uschar *yield = NULL;
1179
1180 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1181
1182 for (i = 0;; i++)
1183   {
1184   uschar buffer[1024];
1185   uschar *p, *ss;
1186
1187   #ifdef USE_READLINE
1188   char *readline_line = NULL;
1189   if (fn_readline != NULL)
1190     {
1191     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1192     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1193     p = US readline_line;
1194     }
1195   else
1196   #endif
1197
1198   /* readline() not in use */
1199
1200     {
1201     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1202     p = buffer;
1203     }
1204
1205   /* Handle the line */
1206
1207   ss = p + (int)Ustrlen(p);
1208   while (ss > p && isspace(ss[-1])) ss--;
1209
1210   if (i > 0)
1211     {
1212     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1213     }
1214
1215   yield = string_cat(yield, &size, &ptr, p, ss - p);
1216
1217   #ifdef USE_READLINE
1218   if (fn_readline != NULL) free(readline_line);
1219   #endif
1220
1221   if (ss == p || yield[ptr-1] != '\\')
1222     {
1223     yield[ptr] = 0;
1224     break;
1225     }
1226   yield[--ptr] = 0;
1227   }
1228
1229 if (yield == NULL) printf("\n");
1230 return yield;
1231 }
1232
1233
1234
1235 /*************************************************
1236 *          Entry point and high-level code       *
1237 *************************************************/
1238
1239 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1240 the appropriate action. All the necessary functions are present in the one
1241 binary. I originally thought one should split it up, but it turns out that so
1242 much of the apparatus is needed in each chunk that one might as well just have
1243 it all available all the time, which then makes the coding easier as well.
1244
1245 Arguments:
1246   argc      count of entries in argv
1247   argv      argument strings, with argv[0] being the program name
1248
1249 Returns:    EXIT_SUCCESS if terminated successfully
1250             EXIT_FAILURE otherwise, except when a message has been sent
1251               to the sender, and -oee was given
1252 */
1253
1254 int
1255 main(int argc, char **cargv)
1256 {
1257 uschar **argv = USS cargv;
1258 int  arg_receive_timeout = -1;
1259 int  arg_smtp_receive_timeout = -1;
1260 int  arg_error_handling = error_handling;
1261 int  filter_sfd = -1;
1262 int  filter_ufd = -1;
1263 int  group_count;
1264 int  i;
1265 int  list_queue_option = 0;
1266 int  msg_action = 0;
1267 int  msg_action_arg = -1;
1268 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1269 int  queue_only_reason = 0;
1270 #ifdef EXIM_PERL
1271 int  perl_start_option = 0;
1272 #endif
1273 int  recipients_arg = argc;
1274 int  sender_address_domain = 0;
1275 int  test_retry_arg = -1;
1276 int  test_rewrite_arg = -1;
1277 BOOL arg_queue_only = FALSE;
1278 BOOL bi_option = FALSE;
1279 BOOL checking = FALSE;
1280 BOOL count_queue = FALSE;
1281 BOOL expansion_test = FALSE;
1282 BOOL extract_recipients = FALSE;
1283 BOOL forced_delivery = FALSE;
1284 BOOL f_end_dot = FALSE;
1285 BOOL deliver_give_up = FALSE;
1286 BOOL list_queue = FALSE;
1287 BOOL list_options = FALSE;
1288 BOOL local_queue_only;
1289 BOOL more = TRUE;
1290 BOOL one_msg_action = FALSE;
1291 BOOL queue_only_set = FALSE;
1292 BOOL receiving_message = TRUE;
1293 BOOL sender_ident_set = FALSE;
1294 BOOL unprivileged;
1295 BOOL removed_privilege = FALSE;
1296 BOOL verify_address_mode = FALSE;
1297 BOOL verify_as_sender = FALSE;
1298 BOOL version_printed = FALSE;
1299 uschar *alias_arg = NULL;
1300 uschar *called_as = US"";
1301 uschar *start_queue_run_id = NULL;
1302 uschar *stop_queue_run_id = NULL;
1303 uschar *expansion_test_message = NULL;
1304 uschar *ftest_domain = NULL;
1305 uschar *ftest_localpart = NULL;
1306 uschar *ftest_prefix = NULL;
1307 uschar *ftest_suffix = NULL;
1308 uschar *real_sender_address;
1309 uschar *originator_home = US"/";
1310 void *reset_point;
1311
1312 struct passwd *pw;
1313 struct stat statbuf;
1314 pid_t passed_qr_pid = (pid_t)0;
1315 int passed_qr_pipe = -1;
1316 gid_t group_list[NGROUPS_MAX];
1317
1318 /* Possible options for -R and -S */
1319
1320 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1321
1322 /* Need to define this in case we need to change the environment in order
1323 to get rid of a bogus time zone. We have to make it char rather than uschar
1324 because some OS define it in /usr/include/unistd.h. */
1325
1326 extern char **environ;
1327
1328 /* If the Exim user and/or group and/or the configuration file owner/group were
1329 defined by ref:name at build time, we must now find the actual uid/gid values.
1330 This is a feature to make the lives of binary distributors easier. */
1331
1332 #ifdef EXIM_USERNAME
1333 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1334   {
1335   exim_gid = pw->pw_gid;
1336   }
1337 else
1338   {
1339   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1340     EXIM_USERNAME);
1341   exit(EXIT_FAILURE);
1342   }
1343 #endif
1344
1345 #ifdef EXIM_GROUPNAME
1346 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1347   {
1348   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1349     EXIM_GROUPNAME);
1350   exit(EXIT_FAILURE);
1351   }
1352 #endif
1353
1354 #ifdef CONFIGURE_OWNERNAME
1355 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1356   {
1357   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1358     CONFIGURE_OWNERNAME);
1359   exit(EXIT_FAILURE);
1360   }
1361 #endif
1362
1363 #ifdef CONFIGURE_GROUPNAME
1364 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1365   {
1366   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1367     CONFIGURE_GROUPNAME);
1368   exit(EXIT_FAILURE);
1369   }
1370 #endif
1371
1372 /* In the Cygwin environment, some initialization needs doing. It is fudged
1373 in by means of this macro. */
1374
1375 #ifdef OS_INIT
1376 OS_INIT
1377 #endif
1378
1379 /* Check a field which is patched when we are running Exim within its
1380 testing harness; do a fast initial check, and then the whole thing. */
1381
1382 running_in_test_harness =
1383   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1384
1385 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1386 at the start of a program; however, it seems that some environments do not
1387 follow this. A "strange" locale can affect the formatting of timestamps, so we
1388 make quite sure. */
1389
1390 setlocale(LC_ALL, "C");
1391
1392 /* Set up the default handler for timing using alarm(). */
1393
1394 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1395
1396 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1397 because store_malloc writes a log entry on failure. */
1398
1399 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1400 if (log_buffer == NULL)
1401   {
1402   fprintf(stderr, "exim: failed to get store for log buffer\n");
1403   exit(EXIT_FAILURE);
1404   }
1405
1406 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1407 NULL when the daemon is run and the file is closed. We have to use this
1408 indirection, because some systems don't allow writing to the variable "stderr".
1409 */
1410
1411 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1412
1413 /* Arrange for the PCRE regex library to use our store functions. Note that
1414 the normal calls are actually macros that add additional arguments for
1415 debugging purposes so we have to assign specially constructed functions here.
1416 The default is to use store in the stacking pool, but this is overridden in the
1417 regex_must_compile() function. */
1418
1419 pcre_malloc = function_store_get;
1420 pcre_free = function_dummy_free;
1421
1422 /* Ensure there is a big buffer for temporary use in several places. It is put
1423 in malloc store so that it can be freed for enlargement if necessary. */
1424
1425 big_buffer = store_malloc(big_buffer_size);
1426
1427 /* Set up the handler for the data request signal, and set the initial
1428 descriptive text. */
1429
1430 set_process_info("initializing");
1431 os_restarting_signal(SIGUSR1, usr1_handler);
1432
1433 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1434 in the daemon code. For the rest of Exim's uses, we ignore it. */
1435
1436 signal(SIGHUP, SIG_IGN);
1437
1438 /* We don't want to die on pipe errors as the code is written to handle
1439 the write error instead. */
1440
1441 signal(SIGPIPE, SIG_IGN);
1442
1443 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1444 set to SIG_IGN. This causes subprocesses that complete before the parent
1445 process waits for them not to hang around, so when Exim calls wait(), nothing
1446 is there. The wait() code has been made robust against this, but let's ensure
1447 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1448 ending status. We use sigaction rather than plain signal() on those OS where
1449 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1450 problem on AIX with this.) */
1451
1452 #ifdef SA_NOCLDWAIT
1453   {
1454   struct sigaction act;
1455   act.sa_handler = SIG_DFL;
1456   sigemptyset(&(act.sa_mask));
1457   act.sa_flags = 0;
1458   sigaction(SIGCHLD, &act, NULL);
1459   }
1460 #else
1461 signal(SIGCHLD, SIG_DFL);
1462 #endif
1463
1464 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1465 SIGHUP. */
1466
1467 sighup_argv = argv;
1468
1469 /* Set up the version number. Set up the leading 'E' for the external form of
1470 message ids, set the pointer to the internal form, and initialize it to
1471 indicate no message being processed. */
1472
1473 version_init();
1474 message_id_option[0] = '-';
1475 message_id_external = message_id_option + 1;
1476 message_id_external[0] = 'E';
1477 message_id = message_id_external + 1;
1478 message_id[0] = 0;
1479
1480 /* Set the umask to zero so that any files Exim creates using open() are
1481 created with the modes that it specifies. NOTE: Files created with fopen() have
1482 a problem, which was not recognized till rather late (February 2006). With this
1483 umask, such files will be world writeable. (They are all content scanning files
1484 in the spool directory, which isn't world-accessible, so this is not a
1485 disaster, but it's untidy.) I don't want to change this overall setting,
1486 however, because it will interact badly with the open() calls. Instead, there's
1487 now a function called modefopen() that fiddles with the umask while calling
1488 fopen(). */
1489
1490 (void)umask(0);
1491
1492 /* Precompile the regular expression for matching a message id. Keep this in
1493 step with the code that generates ids in the accept.c module. We need to do
1494 this here, because the -M options check their arguments for syntactic validity
1495 using mac_ismsgid, which uses this. */
1496
1497 regex_ismsgid =
1498   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1499
1500 /* Precompile the regular expression that is used for matching an SMTP error
1501 code, possibly extended, at the start of an error message. */
1502
1503 regex_smtp_code =
1504   regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1505     FALSE, TRUE);
1506
1507 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1508 this seems to be a generally accepted convention, since one finds symbolic
1509 links called "mailq" in standard OS configurations. */
1510
1511 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1512     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1513   {
1514   list_queue = TRUE;
1515   receiving_message = FALSE;
1516   called_as = US"-mailq";
1517   }
1518
1519 /* If the program is called as "rmail" treat it as equivalent to
1520 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1521 i.e. preventing a single dot on a line from terminating the message, and
1522 returning with zero return code, even in cases of error (provided an error
1523 message has been sent). */
1524
1525 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1526     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1527   {
1528   dot_ends = FALSE;
1529   called_as = US"-rmail";
1530   errors_sender_rc = EXIT_SUCCESS;
1531   }
1532
1533 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1534 this is a smail convention. */
1535
1536 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1537     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1538   {
1539   smtp_input = smtp_batched_input = TRUE;
1540   called_as = US"-rsmtp";
1541   }
1542
1543 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1544 this is a smail convention. */
1545
1546 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1547     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1548   {
1549   queue_interval = 0;
1550   receiving_message = FALSE;
1551   called_as = US"-runq";
1552   }
1553
1554 /* If the program is called as "newaliases" treat it as equivalent to
1555 "exim -bi"; this is a sendmail convention. */
1556
1557 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1558     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1559   {
1560   bi_option = TRUE;
1561   receiving_message = FALSE;
1562   called_as = US"-newaliases";
1563   }
1564
1565 /* Save the original effective uid for a couple of uses later. It should
1566 normally be root, but in some esoteric environments it may not be. */
1567
1568 original_euid = geteuid();
1569
1570 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1571 to be the same as the real ones. This makes a difference only if Exim is setuid
1572 (or setgid) to something other than root, which could be the case in some
1573 special configurations. */
1574
1575 real_uid = getuid();
1576 real_gid = getgid();
1577
1578 if (real_uid == root_uid)
1579   {
1580   setgid(real_gid);
1581   setuid(real_uid);
1582   }
1583
1584 /* If neither the original real uid nor the original euid was root, Exim is
1585 running in an unprivileged state. */
1586
1587 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1588
1589 /* If the first argument is --help, pretend there are no arguments. This will
1590 cause a brief message to be given. */
1591
1592 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1593
1594 /* Scan the program's arguments. Some can be dealt with right away; others are
1595 simply recorded for checking and handling afterwards. Do a high-level switch
1596 on the second character (the one after '-'), to save some effort. */
1597
1598 for (i = 1; i < argc; i++)
1599   {
1600   BOOL badarg = FALSE;
1601   uschar *arg = argv[i];
1602   uschar *argrest;
1603   int switchchar;
1604
1605   /* An argument not starting with '-' is the start of a recipients list;
1606   break out of the options-scanning loop. */
1607
1608   if (arg[0] != '-')
1609     {
1610     recipients_arg = i;
1611     break;
1612     }
1613
1614   /* An option consistion of -- terminates the options */
1615
1616   if (Ustrcmp(arg, "--") == 0)
1617     {
1618     recipients_arg = i + 1;
1619     break;
1620     }
1621
1622   /* Handle flagged options */
1623
1624   switchchar = arg[1];
1625   argrest = arg+2;
1626
1627   /* Make all -ex options synonymous with -oex arguments, since that
1628   is assumed by various callers. Also make -qR options synonymous with -R
1629   options, as that seems to be required as well. Allow for -qqR too, and
1630   the same for -S options. */
1631
1632   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1633       Ustrncmp(arg+1, "qR", 2) == 0 ||
1634       Ustrncmp(arg+1, "qS", 2) == 0)
1635     {
1636     switchchar = arg[2];
1637     argrest++;
1638     }
1639   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1640     {
1641     switchchar = arg[3];
1642     argrest += 2;
1643     queue_2stage = TRUE;
1644     }
1645
1646   /* Make -r synonymous with -f, since it is a documented alias */
1647
1648   else if (arg[1] == 'r') switchchar = 'f';
1649
1650   /* Make -ov synonymous with -v */
1651
1652   else if (Ustrcmp(arg, "-ov") == 0)
1653     {
1654     switchchar = 'v';
1655     argrest++;
1656     }
1657
1658   /* High-level switch on active initial letter */
1659
1660   switch(switchchar)
1661     {
1662     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1663     so has no need of it. */
1664
1665     case 'B':
1666     if (*argrest == 0) i++;       /* Skip over the type */
1667     break;
1668
1669
1670     case 'b':
1671     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1672
1673     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1674        -bdf: Ditto, but in the foreground.
1675     */
1676
1677     if (*argrest == 'd')
1678       {
1679       daemon_listen = TRUE;
1680       if (*(++argrest) == 'f') background_daemon = FALSE;
1681         else if (*argrest != 0) { badarg = TRUE; break; }
1682       }
1683
1684     /* -be:  Run in expansion test mode
1685        -bem: Ditto, but read a message from a file first
1686     */
1687
1688     else if (*argrest == 'e')
1689       {
1690       expansion_test = checking = TRUE;
1691       if (argrest[1] == 'm')
1692         {
1693         if (++i >= argc) { badarg = TRUE; break; }
1694         expansion_test_message = argv[i];
1695         argrest++;
1696         }
1697       if (argrest[1] != 0) { badarg = TRUE; break; }
1698       }
1699
1700     /* -bF:  Run system filter test */
1701
1702     else if (*argrest == 'F')
1703       {
1704       filter_test |= FTEST_SYSTEM;
1705       if (*(++argrest) != 0) { badarg = TRUE; break; }
1706       if (++i < argc) filter_test_sfile = argv[i]; else
1707         {
1708         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1709         exit(EXIT_FAILURE);
1710         }
1711       }
1712
1713     /* -bf:  Run user filter test
1714        -bfd: Set domain for filter testing
1715        -bfl: Set local part for filter testing
1716        -bfp: Set prefix for filter testing
1717        -bfs: Set suffix for filter testing
1718     */
1719
1720     else if (*argrest == 'f')
1721       {
1722       if (*(++argrest) == 0)
1723         {
1724         filter_test |= FTEST_USER;
1725         if (++i < argc) filter_test_ufile = argv[i]; else
1726           {
1727           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1728           exit(EXIT_FAILURE);
1729           }
1730         }
1731       else
1732         {
1733         if (++i >= argc)
1734           {
1735           fprintf(stderr, "exim: string expected after %s\n", arg);
1736           exit(EXIT_FAILURE);
1737           }
1738         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1739         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1740         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1741         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1742         else { badarg = TRUE; break; }
1743         }
1744       }
1745
1746     /* -bh: Host checking - an IP address must follow. */
1747
1748     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1749       {
1750       if (++i >= argc) { badarg = TRUE; break; }
1751       sender_host_address = argv[i];
1752       host_checking = checking = log_testing_mode = TRUE;
1753       host_checking_callout = argrest[1] == 'c';
1754       }
1755
1756     /* -bi: This option is used by sendmail to initialize *the* alias file,
1757     though it has the -oA option to specify a different file. Exim has no
1758     concept of *the* alias file, but since Sun's YP make script calls
1759     sendmail this way, some support must be provided. */
1760
1761     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1762
1763     /* -bm: Accept and deliver message - the default option. Reinstate
1764     receiving_message, which got turned off for all -b options. */
1765
1766     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1767
1768     /* -bnq: For locally originating messages, do not qualify unqualified
1769     addresses. In the envelope, this causes errors; in header lines they
1770     just get left. */
1771
1772     else if (Ustrcmp(argrest, "nq") == 0)
1773       {
1774       allow_unqualified_sender = FALSE;
1775       allow_unqualified_recipient = FALSE;
1776       }
1777
1778     /* -bpxx: List the contents of the mail queue, in various forms. If
1779     the option is -bpc, just a queue count is needed. Otherwise, if the
1780     first letter after p is r, then order is random. */
1781
1782     else if (*argrest == 'p')
1783       {
1784       if (*(++argrest) == 'c')
1785         {
1786         count_queue = TRUE;
1787         if (*(++argrest) != 0) badarg = TRUE;
1788         break;
1789         }
1790
1791       if (*argrest == 'r')
1792         {
1793         list_queue_option = 8;
1794         argrest++;
1795         }
1796       else list_queue_option = 0;
1797
1798       list_queue = TRUE;
1799
1800       /* -bp: List the contents of the mail queue, top-level only */
1801
1802       if (*argrest == 0) {}
1803
1804       /* -bpu: List the contents of the mail queue, top-level undelivered */
1805
1806       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1807
1808       /* -bpa: List the contents of the mail queue, including all delivered */
1809
1810       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1811
1812       /* Unknown after -bp[r] */
1813
1814       else
1815         {
1816         badarg = TRUE;
1817         break;
1818         }
1819       }
1820
1821
1822     /* -bP: List the configuration variables given as the address list.
1823     Force -v, so configuration errors get displayed. */
1824
1825     else if (Ustrcmp(argrest, "P") == 0)
1826       {
1827       list_options = TRUE;
1828       debug_selector |= D_v;
1829       debug_file = stderr;
1830       }
1831
1832     /* -brt: Test retry configuration lookup */
1833
1834     else if (Ustrcmp(argrest, "rt") == 0)
1835       {
1836       test_retry_arg = i + 1;
1837       goto END_ARG;
1838       }
1839
1840     /* -brw: Test rewrite configuration */
1841
1842     else if (Ustrcmp(argrest, "rw") == 0)
1843       {
1844       test_rewrite_arg = i + 1;
1845       goto END_ARG;
1846       }
1847
1848     /* -bS: Read SMTP commands on standard input, but produce no replies -
1849     all errors are reported by sending messages. */
1850
1851     else if (Ustrcmp(argrest, "S") == 0)
1852       smtp_input = smtp_batched_input = receiving_message = TRUE;
1853
1854     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1855     on standard output. */
1856
1857     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1858
1859     /* -bt: address testing mode */
1860
1861     else if (Ustrcmp(argrest, "t") == 0)
1862       address_test_mode = checking = log_testing_mode = TRUE;
1863
1864     /* -bv: verify addresses */
1865
1866     else if (Ustrcmp(argrest, "v") == 0)
1867       verify_address_mode = checking = log_testing_mode = TRUE;
1868
1869     /* -bvs: verify sender addresses */
1870
1871     else if (Ustrcmp(argrest, "vs") == 0)
1872       {
1873       verify_address_mode = checking = log_testing_mode = TRUE;
1874       verify_as_sender = TRUE;
1875       }
1876
1877     /* -bV: Print version string and support details */
1878
1879     else if (Ustrcmp(argrest, "V") == 0)
1880       {
1881       printf("Exim version %s #%s built %s\n", version_string,
1882         version_cnumber, version_date);
1883       printf("%s\n", CS version_copyright);
1884       version_printed = TRUE;
1885       show_whats_supported(stdout);
1886       }
1887
1888     else badarg = TRUE;
1889     break;
1890
1891
1892     /* -C: change configuration file list; ignore if it isn't really
1893     a change! Enforce a prefix check if required. */
1894
1895     case 'C':
1896     if (*argrest == 0)
1897       {
1898       if(++i < argc) argrest = argv[i]; else
1899         { badarg = TRUE; break; }
1900       }
1901     if (Ustrcmp(config_main_filelist, argrest) != 0)
1902       {
1903       #ifdef ALT_CONFIG_PREFIX
1904       int sep = 0;
1905       int len = Ustrlen(ALT_CONFIG_PREFIX);
1906       uschar *list = argrest;
1907       uschar *filename;
1908       while((filename = string_nextinlist(&list, &sep, big_buffer,
1909              big_buffer_size)) != NULL)
1910         {
1911         if ((Ustrlen(filename) < len ||
1912              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1913              Ustrstr(filename, "/../") != NULL) &&
1914              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1915           {
1916           fprintf(stderr, "-C Permission denied\n");
1917           exit(EXIT_FAILURE);
1918           }
1919         }
1920       #endif
1921
1922       config_main_filelist = argrest;
1923       config_changed = TRUE;
1924       }
1925     break;
1926
1927
1928     /* -D: set up a macro definition */
1929
1930     case 'D':
1931     #ifdef DISABLE_D_OPTION
1932     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1933     exit(EXIT_FAILURE);
1934     #else
1935       {
1936       int ptr = 0;
1937       macro_item *mlast = NULL;
1938       macro_item *m;
1939       uschar name[24];
1940       uschar *s = argrest;
1941
1942       while (isspace(*s)) s++;
1943
1944       if (*s < 'A' || *s > 'Z')
1945         {
1946         fprintf(stderr, "exim: macro name set by -D must start with "
1947           "an upper case letter\n");
1948         exit(EXIT_FAILURE);
1949         }
1950
1951       while (isalnum(*s) || *s == '_')
1952         {
1953         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1954         s++;
1955         }
1956       name[ptr] = 0;
1957       if (ptr == 0) { badarg = TRUE; break; }
1958       while (isspace(*s)) s++;
1959       if (*s != 0)
1960         {
1961         if (*s++ != '=') { badarg = TRUE; break; }
1962         while (isspace(*s)) s++;
1963         }
1964
1965       for (m = macros; m != NULL; m = m->next)
1966         {
1967         if (Ustrcmp(m->name, name) == 0)
1968           {
1969           fprintf(stderr, "exim: duplicated -D in command line\n");
1970           exit(EXIT_FAILURE);
1971           }
1972         mlast = m;
1973         }
1974
1975       m = store_get(sizeof(macro_item) + Ustrlen(name));
1976       m->next = NULL;
1977       m->command_line = TRUE;
1978       if (mlast == NULL) macros = m; else mlast->next = m;
1979       Ustrcpy(m->name, name);
1980       m->replacement = string_copy(s);
1981
1982       if (clmacro_count >= MAX_CLMACROS)
1983         {
1984         fprintf(stderr, "exim: too many -D options on command line\n");
1985         exit(EXIT_FAILURE);
1986         }
1987       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1988         m->replacement);
1989       }
1990     #endif
1991     break;
1992
1993     /* -d: Set debug level (see also -v below) or set the drop_cr option.
1994     The latter is now a no-op, retained for compatibility only. If -dd is used,
1995     debugging subprocesses of the daemon is disabled. */
1996
1997     case 'd':
1998     if (Ustrcmp(argrest, "ropcr") == 0)
1999       {
2000       /* drop_cr = TRUE; */
2001       }
2002
2003     /* Use an intermediate variable so that we don't set debugging while
2004     decoding the debugging bits. */
2005
2006     else
2007       {
2008       unsigned int selector = D_default;
2009       debug_selector = 0;
2010       debug_file = NULL;
2011       if (*argrest == 'd')
2012         {
2013         debug_daemon = TRUE;
2014         argrest++;
2015         }
2016       if (*argrest != 0)
2017         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2018           debug_options_count, US"debug");
2019       debug_selector = selector;
2020       }
2021     break;
2022
2023
2024     /* -E: This is a local error message. This option is not intended for
2025     external use at all, but is not restricted to trusted callers because it
2026     does no harm (just suppresses certain error messages) and if Exim is run
2027     not setuid root it won't always be trusted when it generates error
2028     messages using this option. If there is a message id following -E, point
2029     message_reference at it, for logging. */
2030
2031     case 'E':
2032     local_error_message = TRUE;
2033     if (mac_ismsgid(argrest)) message_reference = argrest;
2034     break;
2035
2036
2037     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2038     option, so it looks as if historically the -oex options are also callable
2039     without the leading -o. So we have to accept them. Before the switch,
2040     anything starting -oe has been converted to -e. Exim does not support all
2041     of the sendmail error options. */
2042
2043     case 'e':
2044     if (Ustrcmp(argrest, "e") == 0)
2045       {
2046       arg_error_handling = ERRORS_SENDER;
2047       errors_sender_rc = EXIT_SUCCESS;
2048       }
2049     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2050     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2051     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2052     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2053     else badarg = TRUE;
2054     break;
2055
2056
2057     /* -F: Set sender's full name, used instead of the gecos entry from
2058     the password file. Since users can usually alter their gecos entries,
2059     there's no security involved in using this instead. The data can follow
2060     the -F or be in the next argument. */
2061
2062     case 'F':
2063     if (*argrest == 0)
2064       {
2065       if(++i < argc) argrest = argv[i]; else
2066         { badarg = TRUE; break; }
2067       }
2068     originator_name = argrest;
2069     sender_name_forced = TRUE;
2070     break;
2071
2072
2073     /* -f: Set sender's address - this value is only actually used if Exim is
2074     run by a trusted user, or if untrusted_set_sender is set and matches the
2075     address, except that the null address can always be set by any user. The
2076     test for this happens later, when the value given here is ignored when not
2077     permitted. For an untrusted user, the actual sender is still put in Sender:
2078     if it doesn't match the From: header (unless no_local_from_check is set).
2079     The data can follow the -f or be in the next argument. The -r switch is an
2080     obsolete form of -f but since there appear to be programs out there that
2081     use anything that sendmail has ever supported, better accept it - the
2082     synonymizing is done before the switch above.
2083
2084     At this stage, we must allow domain literal addresses, because we don't
2085     know what the setting of allow_domain_literals is yet. Ditto for trailing
2086     dots and strip_trailing_dot. */
2087
2088     case 'f':
2089       {
2090       int start, end;
2091       uschar *errmess;
2092       if (*argrest == 0)
2093         {
2094         if (i+1 < argc) argrest = argv[++i]; else
2095           { badarg = TRUE; break; }
2096         }
2097       if (*argrest == 0)
2098         {
2099         sender_address = string_sprintf("");  /* Ensure writeable memory */
2100         }
2101       else
2102         {
2103         uschar *temp = argrest + Ustrlen(argrest) - 1;
2104         while (temp >= argrest && isspace(*temp)) temp--;
2105         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2106         allow_domain_literals = TRUE;
2107         strip_trailing_dot = TRUE;
2108         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2109           &sender_address_domain, TRUE);
2110         allow_domain_literals = FALSE;
2111         strip_trailing_dot = FALSE;
2112         if (sender_address == NULL)
2113           {
2114           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2115           return EXIT_FAILURE;
2116           }
2117         }
2118       sender_address_forced = TRUE;
2119       }
2120     break;
2121
2122     /* This is some Sendmail thing which can be ignored */
2123
2124     case 'G':
2125     break;
2126
2127     /* -h: Set the hop count for an incoming message. Exim does not currently
2128     support this; it always computes it by counting the Received: headers.
2129     To put it in will require a change to the spool header file format. */
2130
2131     case 'h':
2132     if (*argrest == 0)
2133       {
2134       if(++i < argc) argrest = argv[i]; else
2135         { badarg = TRUE; break; }
2136       }
2137     if (!isdigit(*argrest)) badarg = TRUE;
2138     break;
2139
2140
2141     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2142     not to be documented for sendmail but mailx (at least) uses it) */
2143
2144     case 'i':
2145     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2146     break;
2147
2148
2149     case 'M':
2150     receiving_message = FALSE;
2151
2152     /* -MC:  continue delivery of another message via an existing open
2153     file descriptor. This option is used for an internal call by the
2154     smtp transport when there is a pending message waiting to go to an
2155     address to which it has got a connection. Five subsequent arguments are
2156     required: transport name, host name, IP address, sequence number, and
2157     message_id. Transports may decline to create new processes if the sequence
2158     number gets too big. The channel is stdin. This (-MC) must be the last
2159     argument. There's a subsequent check that the real-uid is privileged.
2160
2161     If we are running in the test harness. delay for a bit, to let the process
2162     that set this one up complete. This makes for repeatability of the logging,
2163     etc. output. */
2164
2165     if (Ustrcmp(argrest, "C") == 0)
2166       {
2167       if (argc != i + 6)
2168         {
2169         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2170         return EXIT_FAILURE;
2171         }
2172
2173       if (msg_action_arg >= 0)
2174         {
2175         fprintf(stderr, "exim: incompatible arguments\n");
2176         return EXIT_FAILURE;
2177         }
2178
2179       continue_transport = argv[++i];
2180       continue_hostname = argv[++i];
2181       continue_host_address = argv[++i];
2182       continue_sequence = Uatoi(argv[++i]);
2183       msg_action = MSG_DELIVER;
2184       msg_action_arg = ++i;
2185       forced_delivery = TRUE;
2186       queue_run_pid = passed_qr_pid;
2187       queue_run_pipe = passed_qr_pipe;
2188
2189       if (!mac_ismsgid(argv[i]))
2190         {
2191         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2192           argv[i]);
2193         return EXIT_FAILURE;
2194         }
2195
2196       if (running_in_test_harness) millisleep(500);
2197       break;
2198       }
2199
2200     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2201     precedes -MC (see above). The flag indicates that the host to which
2202     Exim is connected has accepted an AUTH sequence. */
2203
2204     else if (Ustrcmp(argrest, "CA") == 0)
2205       {
2206       smtp_authenticated = TRUE;
2207       break;
2208       }
2209
2210     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2211     it preceded -MC (see above) */
2212
2213     else if (Ustrcmp(argrest, "CP") == 0)
2214       {
2215       smtp_use_pipelining = TRUE;
2216       break;
2217       }
2218
2219     /* -MCQ: pass on the pid of the queue-running process that started
2220     this chain of deliveries and the fd of its synchronizing pipe; this
2221     is useful only when it precedes -MC (see above) */
2222
2223     else if (Ustrcmp(argrest, "CQ") == 0)
2224       {
2225       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2226         else badarg = TRUE;
2227       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2228         else badarg = TRUE;
2229       break;
2230       }
2231
2232     /* -MCS: set the smtp_use_size flag; this is useful only when it
2233     precedes -MC (see above) */
2234
2235     else if (Ustrcmp(argrest, "CS") == 0)
2236       {
2237       smtp_use_size = TRUE;
2238       break;
2239       }
2240
2241     /* -MCT: set the tls_offered flag; this is useful only when it
2242     precedes -MC (see above). The flag indicates that the host to which
2243     Exim is connected has offered TLS support. */
2244
2245     #ifdef SUPPORT_TLS
2246     else if (Ustrcmp(argrest, "CT") == 0)
2247       {
2248       tls_offered = TRUE;
2249       break;
2250       }
2251     #endif
2252
2253     /* -M[x]: various operations on the following list of message ids:
2254        -M    deliver the messages, ignoring next retry times and thawing
2255        -Mc   deliver the messages, checking next retry times, no thawing
2256        -Mf   freeze the messages
2257        -Mg   give up on the messages
2258        -Mt   thaw the messages
2259        -Mrm  remove the messages
2260     In the above cases, this must be the last option. There are also the
2261     following options which are followed by a single message id, and which
2262     act on that message. Some of them use the "recipient" addresses as well.
2263        -Mar  add recipient(s)
2264        -Mmad mark all recipients delivered
2265        -Mmd  mark recipients(s) delivered
2266        -Mes  edit sender
2267        -Mset load a message for use with -be
2268        -Mvb  show body
2269        -Mvh  show header
2270        -Mvl  show log
2271     */
2272
2273     else if (*argrest == 0)
2274       {
2275       msg_action = MSG_DELIVER;
2276       forced_delivery = deliver_force_thaw = TRUE;
2277       }
2278     else if (Ustrcmp(argrest, "ar") == 0)
2279       {
2280       msg_action = MSG_ADD_RECIPIENT;
2281       one_msg_action = TRUE;
2282       }
2283     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2284     else if (Ustrcmp(argrest, "es") == 0)
2285       {
2286       msg_action = MSG_EDIT_SENDER;
2287       one_msg_action = TRUE;
2288       }
2289     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2290     else if (Ustrcmp(argrest, "g") == 0)
2291       {
2292       msg_action = MSG_DELIVER;
2293       deliver_give_up = TRUE;
2294       }
2295     else if (Ustrcmp(argrest, "mad") == 0)
2296       {
2297       msg_action = MSG_MARK_ALL_DELIVERED;
2298       }
2299     else if (Ustrcmp(argrest, "md") == 0)
2300       {
2301       msg_action = MSG_MARK_DELIVERED;
2302       one_msg_action = TRUE;
2303       }
2304     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2305     else if (Ustrcmp(argrest, "set") == 0)
2306       {
2307       msg_action = MSG_LOAD;
2308       one_msg_action = TRUE;
2309       }
2310     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2311     else if (Ustrcmp(argrest, "vb") == 0)
2312       {
2313       msg_action = MSG_SHOW_BODY;
2314       one_msg_action = TRUE;
2315       }
2316     else if (Ustrcmp(argrest, "vh") == 0)
2317       {
2318       msg_action = MSG_SHOW_HEADER;
2319       one_msg_action = TRUE;
2320       }
2321     else if (Ustrcmp(argrest, "vl") == 0)
2322       {
2323       msg_action = MSG_SHOW_LOG;
2324       one_msg_action = TRUE;
2325       }
2326     else { badarg = TRUE; break; }
2327
2328     /* All the -Mxx options require at least one message id. */
2329
2330     msg_action_arg = i + 1;
2331     if (msg_action_arg >= argc)
2332       {
2333       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2334       return EXIT_FAILURE;
2335       }
2336
2337     /* Some require only message ids to follow */
2338
2339     if (!one_msg_action)
2340       {
2341       int j;
2342       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2343         {
2344         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2345           argv[j], arg);
2346         return EXIT_FAILURE;
2347         }
2348       goto END_ARG;   /* Remaining args are ids */
2349       }
2350
2351     /* Others require only one message id, possibly followed by addresses,
2352     which will be handled as normal arguments. */
2353
2354     else
2355       {
2356       if (!mac_ismsgid(argv[msg_action_arg]))
2357         {
2358         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2359           argv[msg_action_arg], arg);
2360         return EXIT_FAILURE;
2361         }
2362       i++;
2363       }
2364     break;
2365
2366
2367     /* Some programs seem to call the -om option without the leading o;
2368     for sendmail it askes for "me too". Exim always does this. */
2369
2370     case 'm':
2371     if (*argrest != 0) badarg = TRUE;
2372     break;
2373
2374
2375     /* -N: don't do delivery - a debugging option that stops transports doing
2376     their thing. It implies debugging at the D_v level. */
2377
2378     case 'N':
2379     if (*argrest == 0)
2380       {
2381       dont_deliver = TRUE;
2382       debug_selector |= D_v;
2383       debug_file = stderr;
2384       }
2385     else badarg = TRUE;
2386     break;
2387
2388
2389     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2390     it. */
2391
2392     case 'n':
2393     break;
2394
2395     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2396     option to the specified value. This form uses long names. We need to handle
2397     -O option=value and -Ooption=value. */
2398
2399     case 'O':
2400     if (*argrest == 0)
2401       {
2402       if (++i >= argc)
2403         {
2404         fprintf(stderr, "exim: string expected after -O\n");
2405         exit(EXIT_FAILURE);
2406         }
2407       }
2408     break;
2409
2410     case 'o':
2411
2412     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2413     file" option). */
2414
2415     if (*argrest == 'A')
2416       {
2417       alias_arg = argrest + 1;
2418       if (alias_arg[0] == 0)
2419         {
2420         if (i+1 < argc) alias_arg = argv[++i]; else
2421           {
2422           fprintf(stderr, "exim: string expected after -oA\n");
2423           exit(EXIT_FAILURE);
2424           }
2425         }
2426       }
2427
2428     /* -oB: Set a connection message max value for remote deliveries */
2429
2430     else if (*argrest == 'B')
2431       {
2432       uschar *p = argrest + 1;
2433       if (p[0] == 0)
2434         {
2435         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2436           {
2437           connection_max_messages = 1;
2438           p = NULL;
2439           }
2440         }
2441
2442       if (p != NULL)
2443         {
2444         if (!isdigit(*p))
2445           {
2446           fprintf(stderr, "exim: number expected after -oB\n");
2447           exit(EXIT_FAILURE);
2448           }
2449         connection_max_messages = Uatoi(p);
2450         }
2451       }
2452
2453     /* -odb: background delivery */
2454
2455     else if (Ustrcmp(argrest, "db") == 0)
2456       {
2457       synchronous_delivery = FALSE;
2458       arg_queue_only = FALSE;
2459       queue_only_set = TRUE;
2460       }
2461
2462     /* -odf: foreground delivery (smail-compatible option); same effect as
2463        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2464     */
2465
2466     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2467       {
2468       synchronous_delivery = TRUE;
2469       arg_queue_only = FALSE;
2470       queue_only_set = TRUE;
2471       }
2472
2473     /* -odq: queue only */
2474
2475     else if (Ustrcmp(argrest, "dq") == 0)
2476       {
2477       synchronous_delivery = FALSE;
2478       arg_queue_only = TRUE;
2479       queue_only_set = TRUE;
2480       }
2481
2482     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2483     but no remote delivery */
2484
2485     else if (Ustrcmp(argrest, "dqs") == 0)
2486       {
2487       queue_smtp = TRUE;
2488       arg_queue_only = FALSE;
2489       queue_only_set = TRUE;
2490       }
2491
2492     /* -oex: Sendmail error flags. As these are also accepted without the
2493     leading -o prefix, for compatibility with vacation and other callers,
2494     they are handled with -e above. */
2495
2496     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2497        -oitrue: Another sendmail syntax for the same */
2498
2499     else if (Ustrcmp(argrest, "i") == 0 ||
2500              Ustrcmp(argrest, "itrue") == 0)
2501       dot_ends = FALSE;
2502
2503     /* -oM*: Set various characteristics for an incoming message; actually
2504     acted on for trusted callers only. */
2505
2506     else if (*argrest == 'M')
2507       {
2508       if (i+1 >= argc)
2509         {
2510         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2511         exit(EXIT_FAILURE);
2512         }
2513
2514       /* -oMa: Set sender host address */
2515
2516       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2517
2518       /* -oMaa: Set authenticator name */
2519
2520       else if (Ustrcmp(argrest, "Maa") == 0)
2521         sender_host_authenticated = argv[++i];
2522
2523       /* -oMas: setting authenticated sender */
2524
2525       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2526
2527       /* -oMai: setting authenticated id */
2528
2529       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2530
2531       /* -oMi: Set incoming interface address */
2532
2533       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2534
2535       /* -oMr: Received protocol */
2536
2537       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2538
2539       /* -oMs: Set sender host name */
2540
2541       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2542
2543       /* -oMt: Set sender ident */
2544
2545       else if (Ustrcmp(argrest, "Mt") == 0)
2546         {
2547         sender_ident_set = TRUE;
2548         sender_ident = argv[++i];
2549         }
2550
2551       /* Else a bad argument */
2552
2553       else
2554         {
2555         badarg = TRUE;
2556         break;
2557         }
2558       }
2559
2560     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2561     seem to call this as -m (undocumented), so that is also accepted (see
2562     above). */
2563
2564     else if (Ustrcmp(argrest, "m") == 0) {}
2565
2566     /* -oo: An ancient flag for old-style addresses which still seems to
2567     crop up in some calls (see in SCO). */
2568
2569     else if (Ustrcmp(argrest, "o") == 0) {}
2570
2571     /* -oP <name>: set pid file path for daemon */
2572
2573     else if (Ustrcmp(argrest, "P") == 0)
2574       override_pid_file_path = argv[++i];
2575
2576     /* -or <n>: set timeout for non-SMTP acceptance
2577        -os <n>: set timeout for SMTP acceptance */
2578
2579     else if (*argrest == 'r' || *argrest == 's')
2580       {
2581       int *tp = (*argrest == 'r')?
2582         &arg_receive_timeout : &arg_smtp_receive_timeout;
2583       if (argrest[1] == 0)
2584         {
2585         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2586         }
2587       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2588       if (*tp < 0)
2589         {
2590         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2591         exit(EXIT_FAILURE);
2592         }
2593       }
2594
2595     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2596
2597     else if (Ustrcmp(argrest, "X") == 0)
2598       override_local_interfaces = argv[++i];
2599
2600     /* Unknown -o argument */
2601
2602     else badarg = TRUE;
2603     break;
2604
2605
2606     /* -ps: force Perl startup; -pd force delayed Perl startup */
2607
2608     case 'p':
2609     #ifdef EXIM_PERL
2610     if (*argrest == 's' && argrest[1] == 0)
2611       {
2612       perl_start_option = 1;
2613       break;
2614       }
2615     if (*argrest == 'd' && argrest[1] == 0)
2616       {
2617       perl_start_option = -1;
2618       break;
2619       }
2620     #endif
2621
2622     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2623     which sets the host protocol and host name */
2624
2625     if (*argrest == 0)
2626       {
2627       if (i+1 < argc) argrest = argv[++i]; else
2628         { badarg = TRUE; break; }
2629       }
2630
2631     if (*argrest != 0)
2632       {
2633       uschar *hn = Ustrchr(argrest, ':');
2634       if (hn == NULL)
2635         {
2636         received_protocol = argrest;
2637         }
2638       else
2639         {
2640         received_protocol = string_copyn(argrest, hn - argrest);
2641         sender_host_name = hn + 1;
2642         }
2643       }
2644     break;
2645
2646
2647     case 'q':
2648     receiving_message = FALSE;
2649     if (queue_interval >= 0)
2650       {
2651       fprintf(stderr, "exim: -q specified more than once\n");
2652       exit(EXIT_FAILURE);
2653       }
2654
2655     /* -qq...: Do queue runs in a 2-stage manner */
2656
2657     if (*argrest == 'q')
2658       {
2659       queue_2stage = TRUE;
2660       argrest++;
2661       }
2662
2663     /* -qi...: Do only first (initial) deliveries */
2664
2665     if (*argrest == 'i')
2666       {
2667       queue_run_first_delivery = TRUE;
2668       argrest++;
2669       }
2670
2671     /* -qf...: Run the queue, forcing deliveries
2672        -qff..: Ditto, forcing thawing as well */
2673
2674     if (*argrest == 'f')
2675       {
2676       queue_run_force = TRUE;
2677       if (*(++argrest) == 'f')
2678         {
2679         deliver_force_thaw = TRUE;
2680         argrest++;
2681         }
2682       }
2683
2684     /* -q[f][f]l...: Run the queue only on local deliveries */
2685
2686     if (*argrest == 'l')
2687       {
2688       queue_run_local = TRUE;
2689       argrest++;
2690       }
2691
2692     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2693     optionally starting from a given message id. */
2694
2695     if (*argrest == 0 &&
2696         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2697       {
2698       queue_interval = 0;
2699       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2700         start_queue_run_id = argv[++i];
2701       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2702         stop_queue_run_id = argv[++i];
2703       }
2704
2705     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2706     optionally local only. */
2707
2708     else
2709       {
2710       if (*argrest != 0)
2711         queue_interval = readconf_readtime(argrest, 0, FALSE);
2712       else
2713         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2714       if (queue_interval <= 0)
2715         {
2716         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2717         exit(EXIT_FAILURE);
2718         }
2719       }
2720     break;
2721
2722
2723     case 'R':   /* Synonymous with -qR... */
2724     receiving_message = FALSE;
2725
2726     /* -Rf:   As -R (below) but force all deliveries,
2727        -Rff:  Ditto, but also thaw all frozen messages,
2728        -Rr:   String is regex
2729        -Rrf:  Regex and force
2730        -Rrff: Regex and force and thaw
2731
2732     in all cases provided there are no further characters in this
2733     argument. */
2734
2735     if (*argrest != 0)
2736       {
2737       int i;
2738       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2739         {
2740         if (Ustrcmp(argrest, rsopts[i]) == 0)
2741           {
2742           if (i != 2) queue_run_force = TRUE;
2743           if (i >= 2) deliver_selectstring_regex = TRUE;
2744           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2745           argrest += Ustrlen(rsopts[i]);
2746           }
2747         }
2748       }
2749
2750     /* -R: Set string to match in addresses for forced queue run to
2751     pick out particular messages. */
2752
2753     if (*argrest == 0)
2754       {
2755       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2756         {
2757         fprintf(stderr, "exim: string expected after -R\n");
2758         exit(EXIT_FAILURE);
2759         }
2760       }
2761     else deliver_selectstring = argrest;
2762     break;
2763
2764
2765     /* -r: an obsolete synonym for -f (see above) */
2766
2767
2768     /* -S: Like -R but works on sender. */
2769
2770     case 'S':   /* Synonymous with -qS... */
2771     receiving_message = FALSE;
2772
2773     /* -Sf:   As -S (below) but force all deliveries,
2774        -Sff:  Ditto, but also thaw all frozen messages,
2775        -Sr:   String is regex
2776        -Srf:  Regex and force
2777        -Srff: Regex and force and thaw
2778
2779     in all cases provided there are no further characters in this
2780     argument. */
2781
2782     if (*argrest != 0)
2783       {
2784       int i;
2785       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2786         {
2787         if (Ustrcmp(argrest, rsopts[i]) == 0)
2788           {
2789           if (i != 2) queue_run_force = TRUE;
2790           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2791           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2792           argrest += Ustrlen(rsopts[i]);
2793           }
2794         }
2795       }
2796
2797     /* -S: Set string to match in addresses for forced queue run to
2798     pick out particular messages. */
2799
2800     if (*argrest == 0)
2801       {
2802       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2803         {
2804         fprintf(stderr, "exim: string expected after -S\n");
2805         exit(EXIT_FAILURE);
2806         }
2807       }
2808     else deliver_selectstring_sender = argrest;
2809     break;
2810
2811     /* -Tqt is an option that is exclusively for use by the testing suite.
2812     It is not recognized in other circumstances. It allows for the setting up
2813     of explicit "queue times" so that various warning/retry things can be
2814     tested. Otherwise variability of clock ticks etc. cause problems. */
2815
2816     case 'T':
2817     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2818       fudged_queue_times = argv[++i];
2819     else badarg = TRUE;
2820     break;
2821
2822
2823     /* -t: Set flag to extract recipients from body of message. */
2824
2825     case 't':
2826     if (*argrest == 0) extract_recipients = TRUE;
2827
2828     /* -ti: Set flag to extract recipients from body of message, and also
2829     specify that dot does not end the message. */
2830
2831     else if (Ustrcmp(argrest, "i") == 0)
2832       {
2833       extract_recipients = TRUE;
2834       dot_ends = FALSE;
2835       }
2836
2837     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2838
2839     #ifdef SUPPORT_TLS
2840     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2841     #endif
2842
2843     else badarg = TRUE;
2844     break;
2845
2846
2847     /* -U: This means "initial user submission" in sendmail, apparently. The
2848     doc claims that in future sendmail may refuse syntactically invalid
2849     messages instead of fixing them. For the moment, we just ignore it. */
2850
2851     case 'U':
2852     break;
2853
2854
2855     /* -v: verify things - this is a very low-level debugging */
2856
2857     case 'v':
2858     if (*argrest == 0)
2859       {
2860       debug_selector |= D_v;
2861       debug_file = stderr;
2862       }
2863     else badarg = TRUE;
2864     break;
2865
2866
2867     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2868
2869       The -x flag tells the sendmail command that mail from a local
2870       mail program has National Language Support (NLS) extended characters
2871       in the body of the mail item. The sendmail command can send mail with
2872       extended NLS characters across networks that normally corrupts these
2873       8-bit characters.
2874
2875     As Exim is 8-bit clean, it just ignores this flag. */
2876
2877     case 'x':
2878     if (*argrest != 0) badarg = TRUE;
2879     break;
2880
2881     /* All other initial characters are errors */
2882
2883     default:
2884     badarg = TRUE;
2885     break;
2886     }         /* End of high-level switch statement */
2887
2888   /* Failed to recognize the option, or syntax error */
2889
2890   if (badarg)
2891     {
2892     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2893       "option %s\n", arg);
2894     exit(EXIT_FAILURE);
2895     }
2896   }
2897
2898
2899 /* If -R or -S have been specified without -q, assume a single queue run. */
2900
2901 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2902   queue_interval < 0) queue_interval = 0;
2903
2904
2905 /* Arguments have been processed. Check for incompatibilities. */
2906
2907 END_ARG:
2908 if ((
2909     (smtp_input || extract_recipients || recipients_arg < argc) &&
2910     (daemon_listen || queue_interval >= 0 || bi_option ||
2911       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2912       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2913     ) ||
2914     (
2915     msg_action_arg > 0 &&
2916     (daemon_listen || queue_interval >= 0 || list_options ||
2917       (checking && msg_action != MSG_LOAD) ||
2918       bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2919     ) ||
2920     (
2921     (daemon_listen || queue_interval >= 0) &&
2922     (sender_address != NULL || list_options || list_queue || checking ||
2923       bi_option)
2924     ) ||
2925     (
2926     daemon_listen && queue_interval == 0
2927     ) ||
2928     (
2929     list_options &&
2930     (checking || smtp_input || extract_recipients ||
2931       filter_test != FTEST_NONE || bi_option)
2932     ) ||
2933     (
2934     verify_address_mode &&
2935     (address_test_mode || smtp_input || extract_recipients ||
2936       filter_test != FTEST_NONE || bi_option)
2937     ) ||
2938     (
2939     address_test_mode && (smtp_input || extract_recipients ||
2940       filter_test != FTEST_NONE || bi_option)
2941     ) ||
2942     (
2943     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2944       extract_recipients)
2945     ) ||
2946     (
2947     deliver_selectstring != NULL && queue_interval < 0
2948     ) ||
2949     (
2950     msg_action == MSG_LOAD &&
2951       (!expansion_test || expansion_test_message != NULL)
2952     )
2953    )
2954   {
2955   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2956   exit(EXIT_FAILURE);
2957   }
2958
2959 /* If debugging is set up, set the file and the file descriptor to pass on to
2960 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2961 to run in the foreground. */
2962
2963 if (debug_selector != 0)
2964   {
2965   debug_file = stderr;
2966   debug_fd = fileno(debug_file);
2967   background_daemon = FALSE;
2968   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
2969   if (debug_selector != D_v)    /* -v only doesn't show this */
2970     {
2971     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2972       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2973       debug_selector);
2974     show_whats_supported(stderr);
2975     }
2976   }
2977
2978 /* When started with root privilege, ensure that the limits on the number of
2979 open files and the number of processes (where that is accessible) are
2980 sufficiently large, or are unset, in case Exim has been called from an
2981 environment where the limits are screwed down. Not all OS have the ability to
2982 change some of these limits. */
2983
2984 if (unprivileged)
2985   {
2986   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2987   }
2988 else
2989   {
2990   struct rlimit rlp;
2991
2992   #ifdef RLIMIT_NOFILE
2993   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2994     {
2995     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2996       strerror(errno));
2997     rlp.rlim_cur = rlp.rlim_max = 0;
2998     }
2999
3000   /* I originally chose 1000 as a nice big number that was unlikely to
3001   be exceeded. It turns out that some older OS have a fixed upper limit of
3002   256. */
3003
3004   if (rlp.rlim_cur < 1000)
3005     {
3006     rlp.rlim_cur = rlp.rlim_max = 1000;
3007     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3008       {
3009       rlp.rlim_cur = rlp.rlim_max = 256;
3010       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3011         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3012           strerror(errno));
3013       }
3014     }
3015   #endif
3016
3017   #ifdef RLIMIT_NPROC
3018   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3019     {
3020     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3021       strerror(errno));
3022     rlp.rlim_cur = rlp.rlim_max = 0;
3023     }
3024
3025   #ifdef RLIM_INFINITY
3026   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3027     {
3028     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3029   #else
3030   if (rlp.rlim_cur < 1000)
3031     {
3032     rlp.rlim_cur = rlp.rlim_max = 1000;
3033   #endif
3034     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3035       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3036         strerror(errno));
3037     }
3038   #endif
3039   }
3040
3041 /* Exim is normally entered as root (but some special configurations are
3042 possible that don't do this). However, it always spins off sub-processes that
3043 set their uid and gid as required for local delivery. We don't want to pass on
3044 any extra groups that root may belong to, so we want to get rid of them all at
3045 this point.
3046
3047 We need to obey setgroups() at this stage, before possibly giving up root
3048 privilege for a changed configuration file, but later on we might need to
3049 check on the additional groups for the admin user privilege - can't do that
3050 till after reading the config, which might specify the exim gid. Therefore,
3051 save the group list here first. */
3052
3053 group_count = getgroups(NGROUPS_MAX, group_list);
3054
3055 /* There is a fundamental difference in some BSD systems in the matter of
3056 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3057 known not to be different. On the "different" systems there is a single group
3058 list, and the first entry in it is the current group. On all other versions of
3059 Unix there is a supplementary group list, which is in *addition* to the current
3060 group. Consequently, to get rid of all extraneous groups on a "standard" system
3061 you pass over 0 groups to setgroups(), while on a "different" system you pass
3062 over a single group - the current group, which is always the first group in the
3063 list. Calling setgroups() with zero groups on a "different" system results in
3064 an error return. The following code should cope with both types of system.
3065
3066 However, if this process isn't running as root, setgroups() can't be used
3067 since you have to be root to run it, even if throwing away groups. Not being
3068 root here happens only in some unusual configurations. We just ignore the
3069 error. */
3070
3071 if (setgroups(0, NULL) != 0)
3072   {
3073   if (setgroups(1, group_list) != 0 && !unprivileged)
3074     {
3075     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3076     exit(EXIT_FAILURE);
3077     }
3078   }
3079
3080 /* If the configuration file name has been altered by an argument on the
3081 command line (either a new file name or a macro definition) and the caller is
3082 not root or the exim user, or if this is a filter testing run, remove any
3083 setuid privilege the program has, and run as the underlying user.
3084
3085 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3086 severely restricts the use of -C for some purposes.
3087
3088 Otherwise, set the real ids to the effective values (should be root unless run
3089 from inetd, which it can either be root or the exim uid, if one is configured).
3090
3091 There is a private mechanism for bypassing some of this, in order to make it
3092 possible to test lots of configurations automatically, without having either to
3093 recompile each time, or to patch in an actual configuration file name and other
3094 values (such as the path name). If running in the test harness, pretend that
3095 configuration file changes and macro definitions haven't happened. */
3096
3097 if ((                                            /* EITHER */
3098     (config_changed || macros != NULL) &&        /* Config changed, and */
3099     real_uid != root_uid &&                      /* Not root, and */
3100     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
3101     real_uid != exim_uid &&                      /* Not exim, and */
3102     #endif
3103     !running_in_test_harness                     /* Not fudged */
3104     ) ||                                         /*   OR   */
3105     expansion_test                               /* expansion testing */
3106     ||                                           /*   OR   */
3107     filter_test != FTEST_NONE)                   /* Filter testing */
3108   {
3109   setgroups(group_count, group_list);
3110   exim_setugid(real_uid, real_gid, FALSE,
3111     US"-C, -D, -be or -bf forces real uid");
3112   removed_privilege = TRUE;
3113
3114   /* In the normal case when Exim is called like this, stderr is available
3115   and should be used for any logging information because attempts to write
3116   to the log will usually fail. To arrange this, we unset really_exim. However,
3117   if no stderr is available there is no point - we might as well have a go
3118   at the log (if it fails, syslog will be written). */
3119
3120   if (log_stderr != NULL) really_exim = FALSE;
3121   }
3122
3123 /* Privilege is to be retained for the moment. It may be dropped later,
3124 depending on the job that this Exim process has been asked to do. For now, set
3125 the real uid to the effective so that subsequent re-execs of Exim are done by a
3126 privileged user. */
3127
3128 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3129
3130 /* If testing a filter, open the file(s) now, before wasting time doing other
3131 setups and reading the message. */
3132
3133 if ((filter_test & FTEST_SYSTEM) != 0)
3134   {
3135   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3136   if (filter_sfd < 0)
3137     {
3138     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3139       strerror(errno));
3140     return EXIT_FAILURE;
3141     }
3142   }
3143
3144 if ((filter_test & FTEST_USER) != 0)
3145   {
3146   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3147   if (filter_ufd < 0)
3148     {
3149     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3150       strerror(errno));
3151     return EXIT_FAILURE;
3152     }
3153   }
3154
3155 /* Read the main runtime configuration data; this gives up if there
3156 is a failure. It leaves the configuration file open so that the subsequent
3157 configuration data for delivery can be read if needed. */
3158
3159 readconf_main();
3160
3161 /* Handle the decoding of logging options. */
3162
3163 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3164   log_options, log_options_count, US"log");
3165
3166 DEBUG(D_any)
3167   {
3168   debug_printf("configuration file is %s\n", config_main_filename);
3169   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3170     log_extra_selector);
3171   }
3172
3173 /* If domain literals are not allowed, check the sender address that was
3174 supplied with -f. Ditto for a stripped trailing dot. */
3175
3176 if (sender_address != NULL)
3177   {
3178   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3179     {
3180     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3181       "allowed\n", sender_address);
3182     return EXIT_FAILURE;
3183     }
3184   if (f_end_dot && !strip_trailing_dot)
3185     {
3186     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3187       "(trailing dot not allowed)\n", sender_address);
3188     return EXIT_FAILURE;
3189     }
3190   }
3191
3192 /* Paranoia check of maximum lengths of certain strings. There is a check
3193 on the length of the log file path in log.c, which will come into effect
3194 if there are any calls to write the log earlier than this. However, if we
3195 get this far but the string is very long, it is better to stop now than to
3196 carry on and (e.g.) receive a message and then have to collapse. The call to
3197 log_write() from here will cause the ultimate panic collapse if the complete
3198 file name exceeds the buffer length. */
3199
3200 if (Ustrlen(log_file_path) > 200)
3201   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3202     "log_file_path is longer than 200 chars: aborting");
3203
3204 if (Ustrlen(pid_file_path) > 200)
3205   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3206     "pid_file_path is longer than 200 chars: aborting");
3207
3208 if (Ustrlen(spool_directory) > 200)
3209   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3210     "spool_directory is longer than 200 chars: aborting");
3211
3212 /* Length check on the process name given to syslog for its TAG field,
3213 which is only permitted to be 32 characters or less. See RFC 3164. */
3214
3215 if (Ustrlen(syslog_processname) > 32)
3216   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3217     "syslog_processname is longer than 32 chars: aborting");
3218
3219 /* In some operating systems, the environment variable TMPDIR controls where
3220 temporary files are created; Exim doesn't use these (apart from when delivering
3221 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3222 If TMPDIR is found in the environment, reset it to the value defined in the
3223 TMPDIR macro, if this macro is defined. */
3224
3225 #ifdef TMPDIR
3226   {
3227   uschar **p;
3228   for (p = USS environ; *p != NULL; p++)
3229     {
3230     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3231         Ustrcmp(*p+7, TMPDIR) != 0)
3232       {
3233       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3234       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3235       *p = newp;
3236       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3237       }
3238     }
3239   }
3240 #endif
3241
3242 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3243 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3244 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3245 called by a user who has set the TZ variable. This then affects the timestamps
3246 in log files and in Received: headers, and any created Date: header lines. The
3247 required timezone is settable in the configuration file, so nothing can be done
3248 about this earlier - but hopefully nothing will normally be logged earlier than
3249 this. We have to make a new environment if TZ is wrong, but don't bother if
3250 timestamps_utc is set, because then all times are in UTC anyway. */
3251
3252 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3253   {
3254   timestamps_utc = TRUE;
3255   }
3256 else
3257   {
3258   uschar *envtz = US getenv("TZ");
3259   if ((envtz == NULL && timezone_string != NULL) ||
3260       (envtz != NULL &&
3261         (timezone_string == NULL ||
3262          Ustrcmp(timezone_string, envtz) != 0)))
3263     {
3264     uschar **p = USS environ;
3265     uschar **new;
3266     uschar **newp;
3267     int count = 0;
3268     while (*p++ != NULL) count++;
3269     if (envtz == NULL) count++;
3270     newp = new = malloc(sizeof(uschar *) * (count + 1));
3271     for (p = USS environ; *p != NULL; p++)
3272       {
3273       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3274       *newp++ = *p;
3275       }
3276     if (timezone_string != NULL)
3277       {
3278       *newp = malloc(Ustrlen(timezone_string) + 4);
3279       sprintf(CS *newp++, "TZ=%s", timezone_string);
3280       }
3281     *newp = NULL;
3282     environ = CSS new;
3283     tzset();
3284     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3285       tod_stamp(tod_log));
3286     }
3287   }
3288
3289 /* Handle the case when we have removed the setuid privilege because of -C or
3290 -D. This means that the caller of Exim was not root, and, provided that
3291 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3292 the binary.
3293
3294 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3295 were running as the exim user defined in the configuration file (different to
3296 the one in the binary). The sysadmin may expect this case to retain privilege
3297 because "the binary was called by the Exim user", but it hasn't, because of the
3298 order in which it handles this stuff. There are two possibilities:
3299
3300   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3301       to do message deliveries. Thus, the fact that it is running as a
3302       non-privileged user is plausible, and might be wanted in some special
3303       configurations. However, really_exim will have been set false when
3304       privilege was dropped, to stop Exim trying to write to its normal log
3305       files. Therefore, re-enable normal log processing, assuming the sysadmin
3306       has set up the log directory correctly.
3307
3308   (2) If deliver_drop_privilege is not set, the configuration won't work as
3309       apparently intended, and so we log a panic message. In order to retain
3310       root for -C or -D, the caller must either be root or the Exim user
3311       defined in the binary (when deliver_drop_ privilege is false).
3312
3313 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3314 built-in exim user or one defined in the configuration. In either event,
3315 re-enable log processing, assuming the sysadmin knows what they are doing. */
3316
3317 if (removed_privilege && (config_changed || macros != NULL) &&
3318     real_uid == exim_uid)
3319   {
3320   #ifdef ALT_CONFIG_ROOT_ONLY
3321   really_exim = TRUE;   /* let logging work normally */
3322   #else
3323
3324   if (deliver_drop_privilege)
3325     really_exim = TRUE; /* let logging work normally */
3326   else
3327     log_write(0, LOG_MAIN|LOG_PANIC,
3328       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3329       (int)exim_uid, config_changed? "-C" : "-D");
3330   #endif
3331   }
3332
3333 /* Start up Perl interpreter if Perl support is configured and there is a
3334 perl_startup option, and the configuration or the command line specifies
3335 initializing starting. Note that the global variables are actually called
3336 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3337
3338 #ifdef EXIM_PERL
3339 if (perl_start_option != 0)
3340   opt_perl_at_start = (perl_start_option > 0);
3341 if (opt_perl_at_start && opt_perl_startup != NULL)
3342   {
3343   uschar *errstr;
3344   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3345   errstr = init_perl(opt_perl_startup);
3346   if (errstr != NULL)
3347     {
3348     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3349     return EXIT_FAILURE;
3350     }
3351   opt_perl_started = TRUE;
3352   }
3353 #endif /* EXIM_PERL */
3354
3355 /* Log the arguments of the call if the configuration file said so. This is
3356 a debugging feature for finding out what arguments certain MUAs actually use.
3357 Don't attempt it if logging is disabled, or if listing variables or if
3358 verifying/testing addresses or expansions. */
3359
3360 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3361       && really_exim && !list_options && !checking)
3362   {
3363   int i;
3364   uschar *p = big_buffer;
3365   Ustrcpy(p, "cwd=");
3366   (void)getcwd(CS p+4, big_buffer_size - 4);
3367   while (*p) p++;
3368   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3369   while (*p) p++;
3370   for (i = 0; i < argc; i++)
3371     {
3372     int len = Ustrlen(argv[i]);
3373     uschar *printing;
3374     uschar *quote;
3375     if (p + len + 8 >= big_buffer + big_buffer_size)
3376       {
3377       Ustrcpy(p, " ...");
3378       log_write(0, LOG_MAIN, "%s", big_buffer);
3379       Ustrcpy(big_buffer, "...");
3380       p = big_buffer + 3;
3381       }
3382     printing = string_printing(argv[i]);
3383     if (printing[0] == 0) quote = US"\""; else
3384       {
3385       uschar *pp = printing;
3386       quote = US"";
3387       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3388       }
3389     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3390       (p - big_buffer) - 4), printing, quote);
3391     while (*p) p++;
3392     }
3393
3394   if ((log_extra_selector & LX_arguments) != 0)
3395     log_write(0, LOG_MAIN, "%s", big_buffer);
3396   else
3397     debug_printf("%s\n", big_buffer);
3398   }
3399
3400 /* Set the working directory to be the top-level spool directory. We don't rely
3401 on this in the code, which always uses fully qualified names, but it's useful
3402 for core dumps etc. Don't complain if it fails - the spool directory might not
3403 be generally accessible and calls with the -C option (and others) have lost
3404 privilege by now. Before the chdir, we try to ensure that the directory exists.
3405 */
3406
3407 if (Uchdir(spool_directory) != 0)
3408   {
3409   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3410   (void)Uchdir(spool_directory);
3411   }
3412
3413 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3414 alias file. Exim doesn't have such a concept, but this call is screwed into
3415 Sun's YP makefiles. Handle this by calling a configured script, as the real
3416 user who called Exim. The -oA option can be used to pass an argument to the
3417 script. */
3418
3419 if (bi_option)
3420   {
3421   (void)fclose(config_file);
3422   if (bi_command != NULL)
3423     {
3424     int i = 0;
3425     uschar *argv[3];
3426     argv[i++] = bi_command;
3427     if (alias_arg != NULL) argv[i++] = alias_arg;
3428     argv[i++] = NULL;
3429
3430     setgroups(group_count, group_list);
3431     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3432
3433     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3434       (argv[1] == NULL)? US"" : argv[1]);
3435
3436     execv(CS argv[0], (char *const *)argv);
3437     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3438     exit(EXIT_FAILURE);
3439     }
3440   else
3441     {
3442     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3443     exit(EXIT_SUCCESS);
3444     }
3445   }
3446
3447 /* If an action on specific messages is requested, or if a daemon or queue
3448 runner is being started, we need to know if Exim was called by an admin user.
3449 This is the case if the real user is root or exim, or if the real group is
3450 exim, or if one of the supplementary groups is exim or a group listed in
3451 admin_groups. We don't fail all message actions immediately if not admin_user,
3452 since some actions can be performed by non-admin users. Instead, set admin_user
3453 for later interrogation. */
3454
3455 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3456   admin_user = TRUE;
3457 else
3458   {
3459   int i, j;
3460
3461   for (i = 0; i < group_count; i++)
3462     {
3463     if (group_list[i] == exim_gid) admin_user = TRUE;
3464     else if (admin_groups != NULL)
3465       {
3466       for (j = 1; j <= (int)(admin_groups[0]); j++)
3467         if (admin_groups[j] == group_list[i])
3468           { admin_user = TRUE; break; }
3469       }
3470     if (admin_user) break;
3471     }
3472   }
3473
3474 /* Another group of privileged users are the trusted users. These are root,
3475 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3476 are permitted to specify sender_addresses with -f on the command line, and
3477 other message parameters as well. */
3478
3479 if (real_uid == root_uid || real_uid == exim_uid)
3480   trusted_caller = TRUE;
3481 else
3482   {
3483   int i, j;
3484
3485   if (trusted_users != NULL)
3486     {
3487     for (i = 1; i <= (int)(trusted_users[0]); i++)
3488       if (trusted_users[i] == real_uid)
3489         { trusted_caller = TRUE; break; }
3490     }
3491
3492   if (!trusted_caller && trusted_groups != NULL)
3493     {
3494     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3495       {
3496       if (trusted_groups[i] == real_gid)
3497         trusted_caller = TRUE;
3498       else for (j = 0; j < group_count; j++)
3499         {
3500         if (trusted_groups[i] == group_list[j])
3501           { trusted_caller = TRUE; break; }
3502         }
3503       if (trusted_caller) break;
3504       }
3505     }
3506   }
3507
3508 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3509 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3510
3511 /* Only an admin user may start the daemon or force a queue run in the default
3512 configuration, but the queue run restriction can be relaxed. Only an admin
3513 user may request that a message be returned to its sender forthwith. Only an
3514 admin user may specify a debug level greater than D_v (because it might show
3515 passwords, etc. in lookup queries). Only an admin user may request a queue
3516 count. */
3517