src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.40 2006/06/28 16:00:24 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_PLAINTEXT
 984   fprintf(f, " plaintext");
 985 #endif
 986 #ifdef AUTH_SPA
 987   fprintf(f, " spa");
 988 #endif
 989 fprintf(f, "\n");
 990
 991 fprintf(f, "Routers:");
 992 #ifdef ROUTER_ACCEPT
 993   fprintf(f, " accept");
 994 #endif
 995 #ifdef ROUTER_DNSLOOKUP
 996   fprintf(f, " dnslookup");
 997 #endif
 998 #ifdef ROUTER_IPLITERAL
 999   fprintf(f, " ipliteral");
1000 #endif
1001 #ifdef ROUTER_IPLOOKUP
1002   fprintf(f, " iplookup");
1003 #endif
1004 #ifdef ROUTER_MANUALROUTE
1005   fprintf(f, " manualroute");
1006 #endif
1007 #ifdef ROUTER_QUERYPROGRAM
1008   fprintf(f, " queryprogram");
1009 #endif
1010 #ifdef ROUTER_REDIRECT
1011   fprintf(f, " redirect");
1012 #endif
1013 fprintf(f, "\n");
1014
1015 fprintf(f, "Transports:");
1016 #ifdef TRANSPORT_APPENDFILE
1017   fprintf(f, " appendfile");
1018   #ifdef SUPPORT_MAILDIR
1019     fprintf(f, "/maildir");
1020   #endif
1021   #ifdef SUPPORT_MAILSTORE
1022     fprintf(f, "/mailstore");
1023   #endif
1024   #ifdef SUPPORT_MBX
1025     fprintf(f, "/mbx");
1026   #endif
1027 #endif
1028 #ifdef TRANSPORT_AUTOREPLY
1029   fprintf(f, " autoreply");
1030 #endif
1031 #ifdef TRANSPORT_LMTP
1032   fprintf(f, " lmtp");
1033 #endif
1034 #ifdef TRANSPORT_PIPE
1035   fprintf(f, " pipe");
1036 #endif
1037 #ifdef TRANSPORT_SMTP
1038   fprintf(f, " smtp");
1039 #endif
1040 fprintf(f, "\n");
1041
1042 if (fixed_never_users[0] > 0)
1043   {
1044   int i;
1045   fprintf(f, "Fixed never_users: ");
1046   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1047     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1048   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1049   }
1050
1051 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1052 }
1053
1054
1055
1056
1057 /*************************************************
1058 *               Quote a local part               *
1059 *************************************************/
1060
1061 /* This function is used when a sender address or a From: or Sender: header
1062 line is being created from the caller's login, or from an authenticated_id. It
1063 applies appropriate quoting rules for a local part.
1064
1065 Argument:    the local part
1066 Returns:     the local part, quoted if necessary
1067 */
1068
1069 uschar *
1070 local_part_quote(uschar *lpart)
1071 {
1072 BOOL needs_quote = FALSE;
1073 int size, ptr;
1074 uschar *yield;
1075 uschar *t;
1076
1077 for (t = lpart; !needs_quote && *t != 0; t++)
1078   {
1079   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1080     (*t != '.' || t == lpart || t[1] == 0);
1081   }
1082
1083 if (!needs_quote) return lpart;
1084
1085 size = ptr = 0;
1086 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1087
1088 for (;;)
1089   {
1090   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1091   if (nq == NULL)
1092     {
1093     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1094     break;
1095     }
1096   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1097   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1098   yield = string_cat(yield, &size, &ptr, nq, 1);
1099   lpart = nq + 1;
1100   }
1101
1102 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1103 yield[ptr] = 0;
1104 return yield;
1105 }
1106
1107
1108
1109 #ifdef USE_READLINE
1110 /*************************************************
1111 *         Load readline() functions              *
1112 *************************************************/
1113
1114 /* This function is called from testing executions that read data from stdin,
1115 but only when running as the calling user. Currently, only -be does this. The
1116 function loads the readline() function library and passes back the functions.
1117 On some systems, it needs the curses library, so load that too, but try without
1118 it if loading fails. All this functionality has to be requested at build time.
1119
1120 Arguments:
1121   fn_readline_ptr   pointer to where to put the readline pointer
1122   fn_addhist_ptr    pointer to where to put the addhistory function
1123
1124 Returns:            the dlopen handle or NULL on failure
1125 */
1126
1127 static void *
1128 set_readline(char * (**fn_readline_ptr)(char *),
1129              char * (**fn_addhist_ptr)(char *))
1130 {
1131 void *dlhandle;
1132 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1133
1134 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1135 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1136
1137 if (dlhandle != NULL)
1138   {
1139   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1140   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1141   }
1142 else
1143   {
1144   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1145   }
1146
1147 return dlhandle;
1148 }
1149 #endif
1150
1151
1152
1153 /*************************************************
1154 *    Get a line from stdin for testing things    *
1155 *************************************************/
1156
1157 /* This function is called when running tests that can take a number of lines
1158 of input (for example, -be and -bt). It handles continuations and trailing
1159 spaces. And prompting and a blank line output on eof. If readline() is in use,
1160 the arguments are non-NULL and provide the relevant functions.
1161
1162 Arguments:
1163   fn_readline   readline function or NULL
1164   fn_addhist    addhist function or NULL
1165
1166 Returns:        pointer to dynamic memory, or NULL at end of file
1167 */
1168
1169 static uschar *
1170 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1171 {
1172 int i;
1173 int size = 0;
1174 int ptr = 0;
1175 uschar *yield = NULL;
1176
1177 if (fn_readline == NULL) printf("> ");
1178
1179 for (i = 0;; i++)
1180   {
1181   uschar buffer[1024];
1182   uschar *p, *ss;
1183
1184   #ifdef USE_READLINE
1185   char *readline_line = NULL;
1186   if (fn_readline != NULL)
1187     {
1188     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1189     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1190     p = US readline_line;
1191     }
1192   else
1193   #endif
1194
1195   /* readline() not in use */
1196
1197     {
1198     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1199     p = buffer;
1200     }
1201
1202   /* Handle the line */
1203
1204   ss = p + (int)Ustrlen(p);
1205   while (ss > p && isspace(ss[-1])) ss--;
1206
1207   if (i > 0)
1208     {
1209     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1210     }
1211
1212   yield = string_cat(yield, &size, &ptr, p, ss - p);
1213
1214   #ifdef USE_READLINE
1215   if (fn_readline != NULL) free(readline_line);
1216   #endif
1217
1218   if (ss == p || yield[ptr-1] != '\\')
1219     {
1220     yield[ptr] = 0;
1221     break;
1222     }
1223   yield[--ptr] = 0;
1224   }
1225
1226 if (yield == NULL) printf("\n");
1227 return yield;
1228 }
1229
1230
1231
1232 /*************************************************
1233 *          Entry point and high-level code       *
1234 *************************************************/
1235
1236 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1237 the appropriate action. All the necessary functions are present in the one
1238 binary. I originally thought one should split it up, but it turns out that so
1239 much of the apparatus is needed in each chunk that one might as well just have
1240 it all available all the time, which then makes the coding easier as well.
1241
1242 Arguments:
1243   argc      count of entries in argv
1244   argv      argument strings, with argv[0] being the program name
1245
1246 Returns:    EXIT_SUCCESS if terminated successfully
1247             EXIT_FAILURE otherwise, except when a message has been sent
1248               to the sender, and -oee was given
1249 */
1250
1251 int
1252 main(int argc, char **cargv)
1253 {
1254 uschar **argv = USS cargv;
1255 int  arg_receive_timeout = -1;
1256 int  arg_smtp_receive_timeout = -1;
1257 int  arg_error_handling = error_handling;
1258 int  filter_sfd = -1;
1259 int  filter_ufd = -1;
1260 int  group_count;
1261 int  i;
1262 int  list_queue_option = 0;
1263 int  msg_action = 0;
1264 int  msg_action_arg = -1;
1265 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1266 int  queue_only_reason = 0;
1267 #ifdef EXIM_PERL
1268 int  perl_start_option = 0;
1269 #endif
1270 int  recipients_arg = argc;
1271 int  sender_address_domain = 0;
1272 int  test_retry_arg = -1;
1273 int  test_rewrite_arg = -1;
1274 BOOL arg_queue_only = FALSE;
1275 BOOL bi_option = FALSE;
1276 BOOL checking = FALSE;
1277 BOOL count_queue = FALSE;
1278 BOOL expansion_test = FALSE;
1279 BOOL extract_recipients = FALSE;
1280 BOOL forced_delivery = FALSE;
1281 BOOL f_end_dot = FALSE;
1282 BOOL deliver_give_up = FALSE;
1283 BOOL list_queue = FALSE;
1284 BOOL list_options = FALSE;
1285 BOOL local_queue_only;
1286 BOOL more = TRUE;
1287 BOOL one_msg_action = FALSE;
1288 BOOL queue_only_set = FALSE;
1289 BOOL receiving_message = TRUE;
1290 BOOL unprivileged;
1291 BOOL removed_privilege = FALSE;
1292 BOOL verify_address_mode = FALSE;
1293 BOOL verify_as_sender = FALSE;
1294 BOOL version_printed = FALSE;
1295 uschar *alias_arg = NULL;
1296 uschar *called_as = US"";
1297 uschar *start_queue_run_id = NULL;
1298 uschar *stop_queue_run_id = NULL;
1299 uschar *ftest_domain = NULL;
1300 uschar *ftest_localpart = NULL;
1301 uschar *ftest_prefix = NULL;
1302 uschar *ftest_suffix = NULL;
1303 uschar *real_sender_address;
1304 uschar *originator_home = US"/";
1305 void *reset_point;
1306
1307 struct passwd *pw;
1308 struct stat statbuf;
1309 pid_t passed_qr_pid = (pid_t)0;
1310 int passed_qr_pipe = -1;
1311 gid_t group_list[NGROUPS_MAX];
1312
1313 /* Possible options for -R and -S */
1314
1315 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1316
1317 /* Need to define this in case we need to change the environment in order
1318 to get rid of a bogus time zone. We have to make it char rather than uschar
1319 because some OS define it in /usr/include/unistd.h. */
1320
1321 extern char **environ;
1322
1323 /* If the Exim user and/or group and/or the configuration file owner/group were
1324 defined by ref:name at build time, we must now find the actual uid/gid values.
1325 This is a feature to make the lives of binary distributors easier. */
1326
1327 #ifdef EXIM_USERNAME
1328 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1329   {
1330   exim_gid = pw->pw_gid;
1331   }
1332 else
1333   {
1334   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1335     EXIM_USERNAME);
1336   exit(EXIT_FAILURE);
1337   }
1338 #endif
1339
1340 #ifdef EXIM_GROUPNAME
1341 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1342   {
1343   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1344     EXIM_GROUPNAME);
1345   exit(EXIT_FAILURE);
1346   }
1347 #endif
1348
1349 #ifdef CONFIGURE_OWNERNAME
1350 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1351   {
1352   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1353     CONFIGURE_OWNERNAME);
1354   exit(EXIT_FAILURE);
1355   }
1356 #endif
1357
1358 #ifdef CONFIGURE_GROUPNAME
1359 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1360   {
1361   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1362     CONFIGURE_GROUPNAME);
1363   exit(EXIT_FAILURE);
1364   }
1365 #endif
1366
1367 /* In the Cygwin environment, some initialization needs doing. It is fudged
1368 in by means of this macro. */
1369
1370 #ifdef OS_INIT
1371 OS_INIT
1372 #endif
1373
1374 /* Check a field which is patched when we are running Exim within its
1375 testing harness; do a fast initial check, and then the whole thing. */
1376
1377 running_in_test_harness =
1378   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1379
1380 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1381 at the start of a program; however, it seems that some environments do not
1382 follow this. A "strange" locale can affect the formatting of timestamps, so we
1383 make quite sure. */
1384
1385 setlocale(LC_ALL, "C");
1386
1387 /* Set up the default handler for timing using alarm(). */
1388
1389 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1390
1391 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1392 because store_malloc writes a log entry on failure. */
1393
1394 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1395 if (log_buffer == NULL)
1396   {
1397   fprintf(stderr, "exim: failed to get store for log buffer\n");
1398   exit(EXIT_FAILURE);
1399   }
1400
1401 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1402 NULL when the daemon is run and the file is closed. We have to use this
1403 indirection, because some systems don't allow writing to the variable "stderr".
1404 */
1405
1406 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1407
1408 /* Arrange for the PCRE regex library to use our store functions. Note that
1409 the normal calls are actually macros that add additional arguments for
1410 debugging purposes so we have to assign specially constructed functions here.
1411 The default is to use store in the stacking pool, but this is overridden in the
1412 regex_must_compile() function. */
1413
1414 pcre_malloc = function_store_get;
1415 pcre_free = function_dummy_free;
1416
1417 /* Ensure there is a big buffer for temporary use in several places. It is put
1418 in malloc store so that it can be freed for enlargement if necessary. */
1419
1420 big_buffer = store_malloc(big_buffer_size);
1421
1422 /* Set up the handler for the data request signal, and set the initial
1423 descriptive text. */
1424
1425 set_process_info("initializing");
1426 os_restarting_signal(SIGUSR1, usr1_handler);
1427
1428 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1429 in the daemon code. For the rest of Exim's uses, we ignore it. */
1430
1431 signal(SIGHUP, SIG_IGN);
1432
1433 /* We don't want to die on pipe errors as the code is written to handle
1434 the write error instead. */
1435
1436 signal(SIGPIPE, SIG_IGN);
1437
1438 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1439 set to SIG_IGN. This causes subprocesses that complete before the parent
1440 process waits for them not to hang around, so when Exim calls wait(), nothing
1441 is there. The wait() code has been made robust against this, but let's ensure
1442 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1443 ending status. We use sigaction rather than plain signal() on those OS where
1444 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1445 problem on AIX with this.) */
1446
1447 #ifdef SA_NOCLDWAIT
1448   {
1449   struct sigaction act;
1450   act.sa_handler = SIG_DFL;
1451   sigemptyset(&(act.sa_mask));
1452   act.sa_flags = 0;
1453   sigaction(SIGCHLD, &act, NULL);
1454   }
1455 #else
1456 signal(SIGCHLD, SIG_DFL);
1457 #endif
1458
1459 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1460 SIGHUP. */
1461
1462 sighup_argv = argv;
1463
1464 /* Set up the version number. Set up the leading 'E' for the external form of
1465 message ids, set the pointer to the internal form, and initialize it to
1466 indicate no message being processed. */
1467
1468 version_init();
1469 message_id_option[0] = '-';
1470 message_id_external = message_id_option + 1;
1471 message_id_external[0] = 'E';
1472 message_id = message_id_external + 1;
1473 message_id[0] = 0;
1474
1475 /* Set the umask to zero so that any files Exim creates using open() are
1476 created with the modes that it specifies. NOTE: Files created with fopen() have
1477 a problem, which was not recognized till rather late (February 2006). With this
1478 umask, such files will be world writeable. (They are all content scanning files
1479 in the spool directory, which isn't world-accessible, so this is not a
1480 disaster, but it's untidy.) I don't want to change this overall setting,
1481 however, because it will interact badly with the open() calls. Instead, there's
1482 now a function called modefopen() that fiddles with the umask while calling
1483 fopen(). */
1484
1485 (void)umask(0);
1486
1487 /* Precompile the regular expression for matching a message id. Keep this in
1488 step with the code that generates ids in the accept.c module. We need to do
1489 this here, because the -M options check their arguments for syntactic validity
1490 using mac_ismsgid, which uses this. */
1491
1492 regex_ismsgid =
1493   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1494
1495 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1496 this seems to be a generally accepted convention, since one finds symbolic
1497 links called "mailq" in standard OS configurations. */
1498
1499 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1500     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1501   {
1502   list_queue = TRUE;
1503   receiving_message = FALSE;
1504   called_as = US"-mailq";
1505   }
1506
1507 /* If the program is called as "rmail" treat it as equivalent to
1508 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1509 i.e. preventing a single dot on a line from terminating the message, and
1510 returning with zero return code, even in cases of error (provided an error
1511 message has been sent). */
1512
1513 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1514     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1515   {
1516   dot_ends = FALSE;
1517   called_as = US"-rmail";
1518   errors_sender_rc = EXIT_SUCCESS;
1519   }
1520
1521 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1522 this is a smail convention. */
1523
1524 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1525     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1526   {
1527   smtp_input = smtp_batched_input = TRUE;
1528   called_as = US"-rsmtp";
1529   }
1530
1531 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1532 this is a smail convention. */
1533
1534 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1535     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1536   {
1537   queue_interval = 0;
1538   receiving_message = FALSE;
1539   called_as = US"-runq";
1540   }
1541
1542 /* If the program is called as "newaliases" treat it as equivalent to
1543 "exim -bi"; this is a sendmail convention. */
1544
1545 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1546     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1547   {
1548   bi_option = TRUE;
1549   receiving_message = FALSE;
1550   called_as = US"-newaliases";
1551   }
1552
1553 /* Save the original effective uid for a couple of uses later. It should
1554 normally be root, but in some esoteric environments it may not be. */
1555
1556 original_euid = geteuid();
1557
1558 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1559 to be the same as the real ones. This makes a difference only if Exim is setuid
1560 (or setgid) to something other than root, which could be the case in some
1561 special configurations. */
1562
1563 real_uid = getuid();
1564 real_gid = getgid();
1565
1566 if (real_uid == root_uid)
1567   {
1568   setgid(real_gid);
1569   setuid(real_uid);
1570   }
1571
1572 /* If neither the original real uid nor the original euid was root, Exim is
1573 running in an unprivileged state. */
1574
1575 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1576
1577 /* If the first argument is --help, pretend there are no arguments. This will
1578 cause a brief message to be given. */
1579
1580 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1581
1582 /* Scan the program's arguments. Some can be dealt with right away; others are
1583 simply recorded for checking and handling afterwards. Do a high-level switch
1584 on the second character (the one after '-'), to save some effort. */
1585
1586 for (i = 1; i < argc; i++)
1587   {
1588   BOOL badarg = FALSE;
1589   uschar *arg = argv[i];
1590   uschar *argrest;
1591   int switchchar;
1592
1593   /* An argument not starting with '-' is the start of a recipients list;
1594   break out of the options-scanning loop. */
1595
1596   if (arg[0] != '-')
1597     {
1598     recipients_arg = i;
1599     break;
1600     }
1601
1602   /* An option consistion of -- terminates the options */
1603
1604   if (Ustrcmp(arg, "--") == 0)
1605     {
1606     recipients_arg = i + 1;
1607     break;
1608     }
1609
1610   /* Handle flagged options */
1611
1612   switchchar = arg[1];
1613   argrest = arg+2;
1614
1615   /* Make all -ex options synonymous with -oex arguments, since that
1616   is assumed by various callers. Also make -qR options synonymous with -R
1617   options, as that seems to be required as well. Allow for -qqR too, and
1618   the same for -S options. */
1619
1620   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1621       Ustrncmp(arg+1, "qR", 2) == 0 ||
1622       Ustrncmp(arg+1, "qS", 2) == 0)
1623     {
1624     switchchar = arg[2];
1625     argrest++;
1626     }
1627   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1628     {
1629     switchchar = arg[3];
1630     argrest += 2;
1631     queue_2stage = TRUE;
1632     }
1633
1634   /* Make -r synonymous with -f, since it is a documented alias */
1635
1636   else if (arg[1] == 'r') switchchar = 'f';
1637
1638   /* Make -ov synonymous with -v */
1639
1640   else if (Ustrcmp(arg, "-ov") == 0)
1641     {
1642     switchchar = 'v';
1643     argrest++;
1644     }
1645
1646   /* High-level switch on active initial letter */
1647
1648   switch(switchchar)
1649     {
1650     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1651     so has no need of it. */
1652
1653     case 'B':
1654     if (*argrest == 0) i++;       /* Skip over the type */
1655     break;
1656
1657
1658     case 'b':
1659     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1660
1661     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1662        -bdf: Ditto, but in the foreground.
1663     */
1664
1665     if (*argrest == 'd')
1666       {
1667       daemon_listen = TRUE;
1668       if (*(++argrest) == 'f') background_daemon = FALSE;
1669         else if (*argrest != 0) { badarg = TRUE; break; }
1670       }
1671
1672     /* -be: Run in expansion test mode */
1673
1674     else if (*argrest == 'e')
1675       expansion_test = checking = TRUE;
1676
1677     /* -bF:  Run system filter test */
1678
1679     else if (*argrest == 'F')
1680       {
1681       filter_test |= FTEST_SYSTEM;
1682       if (*(++argrest) != 0) { badarg = TRUE; break; }
1683       if (++i < argc) filter_test_sfile = argv[i]; else
1684         {
1685         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1686         exit(EXIT_FAILURE);
1687         }
1688       }
1689
1690     /* -bf:  Run user filter test
1691        -bfd: Set domain for filter testing
1692        -bfl: Set local part for filter testing
1693        -bfp: Set prefix for filter testing
1694        -bfs: Set suffix for filter testing
1695     */
1696
1697     else if (*argrest == 'f')
1698       {
1699       if (*(++argrest) == 0)
1700         {
1701         filter_test |= FTEST_USER;
1702         if (++i < argc) filter_test_ufile = argv[i]; else
1703           {
1704           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1705           exit(EXIT_FAILURE);
1706           }
1707         }
1708       else
1709         {
1710         if (++i >= argc)
1711           {
1712           fprintf(stderr, "exim: string expected after %s\n", arg);
1713           exit(EXIT_FAILURE);
1714           }
1715         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1716         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1717         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1718         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1719         else { badarg = TRUE; break; }
1720         }
1721       }
1722
1723     /* -bh: Host checking - an IP address must follow. */
1724
1725     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1726       {
1727       if (++i >= argc) { badarg = TRUE; break; }
1728       sender_host_address = argv[i];
1729       host_checking = checking = log_testing_mode = TRUE;
1730       host_checking_callout = argrest[1] == 'c';
1731       }
1732
1733     /* -bi: This option is used by sendmail to initialize *the* alias file,
1734     though it has the -oA option to specify a different file. Exim has no
1735     concept of *the* alias file, but since Sun's YP make script calls
1736     sendmail this way, some support must be provided. */
1737
1738     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1739
1740     /* -bm: Accept and deliver message - the default option. Reinstate
1741     receiving_message, which got turned off for all -b options. */
1742
1743     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1744
1745     /* -bnq: For locally originating messages, do not qualify unqualified
1746     addresses. In the envelope, this causes errors; in header lines they
1747     just get left. */
1748
1749     else if (Ustrcmp(argrest, "nq") == 0)
1750       {
1751       allow_unqualified_sender = FALSE;
1752       allow_unqualified_recipient = FALSE;
1753       }
1754
1755     /* -bpxx: List the contents of the mail queue, in various forms. If
1756     the option is -bpc, just a queue count is needed. Otherwise, if the
1757     first letter after p is r, then order is random. */
1758
1759     else if (*argrest == 'p')
1760       {
1761       if (*(++argrest) == 'c')
1762         {
1763         count_queue = TRUE;
1764         if (*(++argrest) != 0) badarg = TRUE;
1765         break;
1766         }
1767
1768       if (*argrest == 'r')
1769         {
1770         list_queue_option = 8;
1771         argrest++;
1772         }
1773       else list_queue_option = 0;
1774
1775       list_queue = TRUE;
1776
1777       /* -bp: List the contents of the mail queue, top-level only */
1778
1779       if (*argrest == 0) {}
1780
1781       /* -bpu: List the contents of the mail queue, top-level undelivered */
1782
1783       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1784
1785       /* -bpa: List the contents of the mail queue, including all delivered */
1786
1787       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1788
1789       /* Unknown after -bp[r] */
1790
1791       else
1792         {
1793         badarg = TRUE;
1794         break;
1795         }
1796       }
1797
1798
1799     /* -bP: List the configuration variables given as the address list.
1800     Force -v, so configuration errors get displayed. */
1801
1802     else if (Ustrcmp(argrest, "P") == 0)
1803       {
1804       list_options = TRUE;
1805       debug_selector |= D_v;
1806       debug_file = stderr;
1807       }
1808
1809     /* -brt: Test retry configuration lookup */
1810
1811     else if (Ustrcmp(argrest, "rt") == 0)
1812       {
1813       test_retry_arg = i + 1;
1814       goto END_ARG;
1815       }
1816
1817     /* -brw: Test rewrite configuration */
1818
1819     else if (Ustrcmp(argrest, "rw") == 0)
1820       {
1821       test_rewrite_arg = i + 1;
1822       goto END_ARG;
1823       }
1824
1825     /* -bS: Read SMTP commands on standard input, but produce no replies -
1826     all errors are reported by sending messages. */
1827
1828     else if (Ustrcmp(argrest, "S") == 0)
1829       smtp_input = smtp_batched_input = receiving_message = TRUE;
1830
1831     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1832     on standard output. */
1833
1834     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1835
1836     /* -bt: address testing mode */
1837
1838     else if (Ustrcmp(argrest, "t") == 0)
1839       address_test_mode = checking = log_testing_mode = TRUE;
1840
1841     /* -bv: verify addresses */
1842
1843     else if (Ustrcmp(argrest, "v") == 0)
1844       verify_address_mode = checking = log_testing_mode = TRUE;
1845
1846     /* -bvs: verify sender addresses */
1847
1848     else if (Ustrcmp(argrest, "vs") == 0)
1849       {
1850       verify_address_mode = checking = log_testing_mode = TRUE;
1851       verify_as_sender = TRUE;
1852       }
1853
1854     /* -bV: Print version string and support details */
1855
1856     else if (Ustrcmp(argrest, "V") == 0)
1857       {
1858       printf("Exim version %s #%s built %s\n", version_string,
1859         version_cnumber, version_date);
1860       printf("%s\n", CS version_copyright);
1861       version_printed = TRUE;
1862       show_whats_supported(stdout);
1863       }
1864
1865     else badarg = TRUE;
1866     break;
1867
1868
1869     /* -C: change configuration file list; ignore if it isn't really
1870     a change! Enforce a prefix check if required. */
1871
1872     case 'C':
1873     if (*argrest == 0)
1874       {
1875       if(++i < argc) argrest = argv[i]; else
1876         { badarg = TRUE; break; }
1877       }
1878     if (Ustrcmp(config_main_filelist, argrest) != 0)
1879       {
1880       #ifdef ALT_CONFIG_PREFIX
1881       int sep = 0;
1882       int len = Ustrlen(ALT_CONFIG_PREFIX);
1883       uschar *list = argrest;
1884       uschar *filename;
1885       while((filename = string_nextinlist(&list, &sep, big_buffer,
1886              big_buffer_size)) != NULL)
1887         {
1888         if ((Ustrlen(filename) < len ||
1889              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1890              Ustrstr(filename, "/../") != NULL) &&
1891              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1892           {
1893           fprintf(stderr, "-C Permission denied\n");
1894           exit(EXIT_FAILURE);
1895           }
1896         }
1897       #endif
1898
1899       config_main_filelist = argrest;
1900       config_changed = TRUE;
1901       }
1902     break;
1903
1904
1905     /* -D: set up a macro definition */
1906
1907     case 'D':
1908     #ifdef DISABLE_D_OPTION
1909     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1910     exit(EXIT_FAILURE);
1911     #else
1912       {
1913       int ptr = 0;
1914       macro_item *mlast = NULL;
1915       macro_item *m;
1916       uschar name[24];
1917       uschar *s = argrest;
1918
1919       while (isspace(*s)) s++;
1920
1921       if (*s < 'A' || *s > 'Z')
1922         {
1923         fprintf(stderr, "exim: macro name set by -D must start with "
1924           "an upper case letter\n");
1925         exit(EXIT_FAILURE);
1926         }
1927
1928       while (isalnum(*s) || *s == '_')
1929         {
1930         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1931         s++;
1932         }
1933       name[ptr] = 0;
1934       if (ptr == 0) { badarg = TRUE; break; }
1935       while (isspace(*s)) s++;
1936       if (*s != 0)
1937         {
1938         if (*s++ != '=') { badarg = TRUE; break; }
1939         while (isspace(*s)) s++;
1940         }
1941
1942       for (m = macros; m != NULL; m = m->next)
1943         {
1944         if (Ustrcmp(m->name, name) == 0)
1945           {
1946           fprintf(stderr, "exim: duplicated -D in command line\n");
1947           exit(EXIT_FAILURE);
1948           }
1949         mlast = m;
1950         }
1951
1952       m = store_get(sizeof(macro_item) + Ustrlen(name));
1953       m->next = NULL;
1954       m->command_line = TRUE;
1955       if (mlast == NULL) macros = m; else mlast->next = m;
1956       Ustrcpy(m->name, name);
1957       m->replacement = string_copy(s);
1958
1959       if (clmacro_count >= MAX_CLMACROS)
1960         {
1961         fprintf(stderr, "exim: too many -D options on command line\n");
1962         exit(EXIT_FAILURE);
1963         }
1964       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1965         m->replacement);
1966       }
1967     #endif
1968     break;
1969
1970     /* -d: Set debug level (see also -v below) or set the drop_cr option.
1971     The latter is now a no-op, retained for compatibility only. If -dd is used,
1972     debugging subprocesses of the daemon is disabled. */
1973
1974     case 'd':
1975     if (Ustrcmp(argrest, "ropcr") == 0)
1976       {
1977       /* drop_cr = TRUE; */
1978       }
1979
1980     /* Use an intermediate variable so that we don't set debugging while
1981     decoding the debugging bits. */
1982
1983     else
1984       {
1985       unsigned int selector = D_default;
1986       debug_selector = 0;
1987       debug_file = NULL;
1988       if (*argrest == 'd')
1989         {
1990         debug_daemon = TRUE;
1991         argrest++;
1992         }
1993       if (*argrest != 0)
1994         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1995           debug_options_count, US"debug");
1996       debug_selector = selector;
1997       }
1998     break;
1999
2000
2001     /* -E: This is a local error message. This option is not intended for
2002     external use at all, but is not restricted to trusted callers because it
2003     does no harm (just suppresses certain error messages) and if Exim is run
2004     not setuid root it won't always be trusted when it generates error
2005     messages using this option. If there is a message id following -E, point
2006     message_reference at it, for logging. */
2007
2008     case 'E':
2009     local_error_message = TRUE;
2010     if (mac_ismsgid(argrest)) message_reference = argrest;
2011     break;
2012
2013
2014     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2015     option, so it looks as if historically the -oex options are also callable
2016     without the leading -o. So we have to accept them. Before the switch,
2017     anything starting -oe has been converted to -e. Exim does not support all
2018     of the sendmail error options. */
2019
2020     case 'e':
2021     if (Ustrcmp(argrest, "e") == 0)
2022       {
2023       arg_error_handling = ERRORS_SENDER;
2024       errors_sender_rc = EXIT_SUCCESS;
2025       }
2026     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2027     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2028     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2029     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2030     else badarg = TRUE;
2031     break;
2032
2033
2034     /* -F: Set sender's full name, used instead of the gecos entry from
2035     the password file. Since users can usually alter their gecos entries,
2036     there's no security involved in using this instead. The data can follow
2037     the -F or be in the next argument. */
2038
2039     case 'F':
2040     if (*argrest == 0)
2041       {
2042       if(++i < argc) argrest = argv[i]; else
2043         { badarg = TRUE; break; }
2044       }
2045     originator_name = argrest;
2046     sender_name_forced = TRUE;
2047     break;
2048
2049
2050     /* -f: Set sender's address - this value is only actually used if Exim is
2051     run by a trusted user, or if untrusted_set_sender is set and matches the
2052     address, except that the null address can always be set by any user. The
2053     test for this happens later, when the value given here is ignored when not
2054     permitted. For an untrusted user, the actual sender is still put in Sender:
2055     if it doesn't match the From: header (unless no_local_from_check is set).
2056     The data can follow the -f or be in the next argument. The -r switch is an
2057     obsolete form of -f but since there appear to be programs out there that
2058     use anything that sendmail has ever supported, better accept it - the
2059     synonymizing is done before the switch above.
2060
2061     At this stage, we must allow domain literal addresses, because we don't
2062     know what the setting of allow_domain_literals is yet. Ditto for trailing
2063     dots and strip_trailing_dot. */
2064
2065     case 'f':
2066       {
2067       int start, end;
2068       uschar *errmess;
2069       if (*argrest == 0)
2070         {
2071         if (i+1 < argc) argrest = argv[++i]; else
2072           { badarg = TRUE; break; }
2073         }
2074       if (*argrest == 0)
2075         {
2076         sender_address = string_sprintf("");  /* Ensure writeable memory */
2077         }
2078       else
2079         {
2080         uschar *temp = argrest + Ustrlen(argrest) - 1;
2081         while (temp >= argrest && isspace(*temp)) temp--;
2082         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2083         allow_domain_literals = TRUE;
2084         strip_trailing_dot = TRUE;
2085         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2086           &sender_address_domain, TRUE);
2087         allow_domain_literals = FALSE;
2088         strip_trailing_dot = FALSE;
2089         if (sender_address == NULL)
2090           {
2091           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2092           return EXIT_FAILURE;
2093           }
2094         }
2095       sender_address_forced = TRUE;
2096       }
2097     break;
2098
2099     /* This is some Sendmail thing which can be ignored */
2100
2101     case 'G':
2102     break;
2103
2104     /* -h: Set the hop count for an incoming message. Exim does not currently
2105     support this; it always computes it by counting the Received: headers.
2106     To put it in will require a change to the spool header file format. */
2107
2108     case 'h':
2109     if (*argrest == 0)
2110       {
2111       if(++i < argc) argrest = argv[i]; else
2112         { badarg = TRUE; break; }
2113       }
2114     if (!isdigit(*argrest)) badarg = TRUE;
2115     break;
2116
2117
2118     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2119     not to be documented for sendmail but mailx (at least) uses it) */
2120
2121     case 'i':
2122     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2123     break;
2124
2125
2126     case 'M':
2127     receiving_message = FALSE;
2128
2129     /* -MC:  continue delivery of another message via an existing open
2130     file descriptor. This option is used for an internal call by the
2131     smtp transport when there is a pending message waiting to go to an
2132     address to which it has got a connection. Five subsequent arguments are
2133     required: transport name, host name, IP address, sequence number, and
2134     message_id. Transports may decline to create new processes if the sequence
2135     number gets too big. The channel is stdin. This (-MC) must be the last
2136     argument. There's a subsequent check that the real-uid is privileged.
2137
2138     If we are running in the test harness. delay for a bit, to let the process
2139     that set this one up complete. This makes for repeatability of the logging,
2140     etc. output. */
2141
2142     if (Ustrcmp(argrest, "C") == 0)
2143       {
2144       if (argc != i + 6)
2145         {
2146         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2147         return EXIT_FAILURE;
2148         }
2149
2150       if (msg_action_arg >= 0)
2151         {
2152         fprintf(stderr, "exim: incompatible arguments\n");
2153         return EXIT_FAILURE;
2154         }
2155
2156       continue_transport = argv[++i];
2157       continue_hostname = argv[++i];
2158       continue_host_address = argv[++i];
2159       continue_sequence = Uatoi(argv[++i]);
2160       msg_action = MSG_DELIVER;
2161       msg_action_arg = ++i;
2162       forced_delivery = TRUE;
2163       queue_run_pid = passed_qr_pid;
2164       queue_run_pipe = passed_qr_pipe;
2165
2166       if (!mac_ismsgid(argv[i]))
2167         {
2168         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2169           argv[i]);
2170         return EXIT_FAILURE;
2171         }
2172
2173       if (running_in_test_harness) millisleep(500);
2174       break;
2175       }
2176
2177     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2178     precedes -MC (see above). The flag indicates that the host to which
2179     Exim is connected has accepted an AUTH sequence. */
2180
2181     else if (Ustrcmp(argrest, "CA") == 0)
2182       {
2183       smtp_authenticated = TRUE;
2184       break;
2185       }
2186
2187     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2188     it preceded -MC (see above) */
2189
2190     else if (Ustrcmp(argrest, "CP") == 0)
2191       {
2192       smtp_use_pipelining = TRUE;
2193       break;
2194       }
2195
2196     /* -MCQ: pass on the pid of the queue-running process that started
2197     this chain of deliveries and the fd of its synchronizing pipe; this
2198     is useful only when it precedes -MC (see above) */
2199
2200     else if (Ustrcmp(argrest, "CQ") == 0)
2201       {
2202       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2203         else badarg = TRUE;
2204       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2205         else badarg = TRUE;
2206       break;
2207       }
2208
2209     /* -MCS: set the smtp_use_size flag; this is useful only when it
2210     precedes -MC (see above) */
2211
2212     else if (Ustrcmp(argrest, "CS") == 0)
2213       {
2214       smtp_use_size = TRUE;
2215       break;
2216       }
2217
2218     /* -MCT: set the tls_offered flag; this is useful only when it
2219     precedes -MC (see above). The flag indicates that the host to which
2220     Exim is connected has offered TLS support. */
2221
2222     #ifdef SUPPORT_TLS
2223     else if (Ustrcmp(argrest, "CT") == 0)
2224       {
2225       tls_offered = TRUE;
2226       break;
2227       }
2228     #endif
2229
2230     /* -M[x]: various operations on the following list of message ids:
2231        -M    deliver the messages, ignoring next retry times and thawing
2232        -Mc   deliver the messages, checking next retry times, no thawing
2233        -Mf   freeze the messages
2234        -Mg   give up on the messages
2235        -Mt   thaw the messages
2236        -Mrm  remove the messages
2237     In the above cases, this must be the last option. There are also the
2238     following options which are followed by a single message id, and which
2239     act on that message. Some of them use the "recipient" addresses as well.
2240        -Mar  add recipient(s)
2241        -Mmad mark all recipients delivered
2242        -Mmd  mark recipients(s) delivered
2243        -Mes  edit sender
2244        -Mvb  show body
2245        -Mvh  show header
2246        -Mvl  show log
2247     */
2248
2249     else if (*argrest == 0)
2250       {
2251       msg_action = MSG_DELIVER;
2252       forced_delivery = deliver_force_thaw = TRUE;
2253       }
2254     else if (Ustrcmp(argrest, "ar") == 0)
2255       {
2256       msg_action = MSG_ADD_RECIPIENT;
2257       one_msg_action = TRUE;
2258       }
2259     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2260     else if (Ustrcmp(argrest, "es") == 0)
2261       {
2262       msg_action = MSG_EDIT_SENDER;
2263       one_msg_action = TRUE;
2264       }
2265     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2266     else if (Ustrcmp(argrest, "g") == 0)
2267       {
2268       msg_action = MSG_DELIVER;
2269       deliver_give_up = TRUE;
2270       }
2271     else if (Ustrcmp(argrest, "mad") == 0)
2272       {
2273       msg_action = MSG_MARK_ALL_DELIVERED;
2274       }
2275     else if (Ustrcmp(argrest, "md") == 0)
2276       {
2277       msg_action = MSG_MARK_DELIVERED;
2278       one_msg_action = TRUE;
2279       }
2280     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2281     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2282     else if (Ustrcmp(argrest, "vb") == 0)
2283       {
2284       msg_action = MSG_SHOW_BODY;
2285       one_msg_action = TRUE;
2286       }
2287     else if (Ustrcmp(argrest, "vh") == 0)
2288       {
2289       msg_action = MSG_SHOW_HEADER;
2290       one_msg_action = TRUE;
2291       }
2292     else if (Ustrcmp(argrest, "vl") == 0)
2293       {
2294       msg_action = MSG_SHOW_LOG;
2295       one_msg_action = TRUE;
2296       }
2297     else { badarg = TRUE; break; }
2298
2299     /* All the -Mxx options require at least one message id. */
2300
2301     msg_action_arg = i + 1;
2302     if (msg_action_arg >= argc)
2303       {
2304       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2305       return EXIT_FAILURE;
2306       }
2307
2308     /* Some require only message ids to follow */
2309
2310     if (!one_msg_action)
2311       {
2312       int j;
2313       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2314         {
2315         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2316           argv[j], arg);
2317         return EXIT_FAILURE;
2318         }
2319       goto END_ARG;   /* Remaining args are ids */
2320       }
2321
2322     /* Others require only one message id, possibly followed by addresses,
2323     which will be handled as normal arguments. */
2324
2325     else
2326       {
2327       if (!mac_ismsgid(argv[msg_action_arg]))
2328         {
2329         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2330           argv[msg_action_arg], arg);
2331         return EXIT_FAILURE;
2332         }
2333       i++;
2334       }
2335     break;
2336
2337
2338     /* Some programs seem to call the -om option without the leading o;
2339     for sendmail it askes for "me too". Exim always does this. */
2340
2341     case 'm':
2342     if (*argrest != 0) badarg = TRUE;
2343     break;
2344
2345
2346     /* -N: don't do delivery - a debugging option that stops transports doing
2347     their thing. It implies debugging at the D_v level. */
2348
2349     case 'N':
2350     if (*argrest == 0)
2351       {
2352       dont_deliver = TRUE;
2353       debug_selector |= D_v;
2354       debug_file = stderr;
2355       }
2356     else badarg = TRUE;
2357     break;
2358
2359
2360     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2361     it. */
2362
2363     case 'n':
2364     break;
2365
2366     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2367     option to the specified value. This form uses long names. We need to handle
2368     -O option=value and -Ooption=value. */
2369
2370     case 'O':
2371     if (*argrest == 0)
2372       {
2373       if (++i >= argc)
2374         {
2375         fprintf(stderr, "exim: string expected after -O\n");
2376         exit(EXIT_FAILURE);
2377         }
2378       }
2379     break;
2380
2381     case 'o':
2382
2383     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2384     file" option). */
2385
2386     if (*argrest == 'A')
2387       {
2388       alias_arg = argrest + 1;
2389       if (alias_arg[0] == 0)
2390         {
2391         if (i+1 < argc) alias_arg = argv[++i]; else
2392           {
2393           fprintf(stderr, "exim: string expected after -oA\n");
2394           exit(EXIT_FAILURE);
2395           }
2396         }
2397       }
2398
2399     /* -oB: Set a connection message max value for remote deliveries */
2400
2401     else if (*argrest == 'B')
2402       {
2403       uschar *p = argrest + 1;
2404       if (p[0] == 0)
2405         {
2406         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2407           {
2408           connection_max_messages = 1;
2409           p = NULL;
2410           }
2411         }
2412
2413       if (p != NULL)
2414         {
2415         if (!isdigit(*p))
2416           {
2417           fprintf(stderr, "exim: number expected after -oB\n");
2418           exit(EXIT_FAILURE);
2419           }
2420         connection_max_messages = Uatoi(p);
2421         }
2422       }
2423
2424     /* -odb: background delivery */
2425
2426     else if (Ustrcmp(argrest, "db") == 0)
2427       {
2428       synchronous_delivery = FALSE;
2429       arg_queue_only = FALSE;
2430       queue_only_set = TRUE;
2431       }
2432
2433     /* -odf: foreground delivery (smail-compatible option); same effect as
2434        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2435     */
2436
2437     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2438       {
2439       synchronous_delivery = TRUE;
2440       arg_queue_only = FALSE;
2441       queue_only_set = TRUE;
2442       }
2443
2444     /* -odq: queue only */
2445
2446     else if (Ustrcmp(argrest, "dq") == 0)
2447       {
2448       synchronous_delivery = FALSE;
2449       arg_queue_only = TRUE;
2450       queue_only_set = TRUE;
2451       }
2452
2453     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2454     but no remote delivery */
2455
2456     else if (Ustrcmp(argrest, "dqs") == 0)
2457       {
2458       queue_smtp = TRUE;
2459       arg_queue_only = FALSE;
2460       queue_only_set = TRUE;
2461       }
2462
2463     /* -oex: Sendmail error flags. As these are also accepted without the
2464     leading -o prefix, for compatibility with vacation and other callers,
2465     they are handled with -e above. */
2466
2467     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2468        -oitrue: Another sendmail syntax for the same */
2469
2470     else if (Ustrcmp(argrest, "i") == 0 ||
2471              Ustrcmp(argrest, "itrue") == 0)
2472       dot_ends = FALSE;
2473
2474     /* -oM*: Set various characteristics for an incoming message; actually
2475     acted on for trusted callers only. */
2476
2477     else if (*argrest == 'M')
2478       {
2479       if (i+1 >= argc)
2480         {
2481         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2482         exit(EXIT_FAILURE);
2483         }
2484
2485       /* -oMa: Set sender host address */
2486
2487       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2488
2489       /* -oMaa: Set authenticator name */
2490
2491       else if (Ustrcmp(argrest, "Maa") == 0)
2492         sender_host_authenticated = argv[++i];
2493
2494       /* -oMas: setting authenticated sender */
2495
2496       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2497
2498       /* -oMai: setting authenticated id */
2499
2500       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2501
2502       /* -oMi: Set incoming interface address */
2503
2504       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2505
2506       /* -oMr: Received protocol */
2507
2508       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2509
2510       /* -oMs: Set sender host name */
2511
2512       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2513
2514       /* -oMt: Set sender ident */
2515
2516       else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2517
2518       /* Else a bad argument */
2519
2520       else
2521         {
2522         badarg = TRUE;
2523         break;
2524         }
2525       }
2526
2527     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2528     seem to call this as -m (undocumented), so that is also accepted (see
2529     above). */
2530
2531     else if (Ustrcmp(argrest, "m") == 0) {}
2532
2533     /* -oo: An ancient flag for old-style addresses which still seems to
2534     crop up in some calls (see in SCO). */
2535
2536     else if (Ustrcmp(argrest, "o") == 0) {}
2537
2538     /* -oP <name>: set pid file path for daemon */
2539
2540     else if (Ustrcmp(argrest, "P") == 0)
2541       override_pid_file_path = argv[++i];
2542
2543     /* -or <n>: set timeout for non-SMTP acceptance
2544        -os <n>: set timeout for SMTP acceptance */
2545
2546     else if (*argrest == 'r' || *argrest == 's')
2547       {
2548       int *tp = (*argrest == 'r')?
2549         &arg_receive_timeout : &arg_smtp_receive_timeout;
2550       if (argrest[1] == 0)
2551         {
2552         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2553         }
2554       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2555       if (*tp < 0)
2556         {
2557         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2558         exit(EXIT_FAILURE);
2559         }
2560       }
2561
2562     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2563
2564     else if (Ustrcmp(argrest, "X") == 0)
2565       override_local_interfaces = argv[++i];
2566
2567     /* Unknown -o argument */
2568
2569     else badarg = TRUE;
2570     break;
2571
2572
2573     /* -ps: force Perl startup; -pd force delayed Perl startup */
2574
2575     case 'p':
2576     #ifdef EXIM_PERL
2577     if (*argrest == 's' && argrest[1] == 0)
2578       {
2579       perl_start_option = 1;
2580       break;
2581       }
2582     if (*argrest == 'd' && argrest[1] == 0)
2583       {
2584       perl_start_option = -1;
2585       break;
2586       }
2587     #endif
2588
2589     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2590     which sets the host protocol and host name */
2591
2592     if (*argrest == 0)
2593       {
2594       if (i+1 < argc) argrest = argv[++i]; else
2595         { badarg = TRUE; break; }
2596       }
2597
2598     if (*argrest != 0)
2599       {
2600       uschar *hn = Ustrchr(argrest, ':');
2601       if (hn == NULL)
2602         {
2603         received_protocol = argrest;
2604         }
2605       else
2606         {
2607         received_protocol = string_copyn(argrest, hn - argrest);
2608         sender_host_name = hn + 1;
2609         }
2610       }
2611     break;
2612
2613
2614     case 'q':
2615     receiving_message = FALSE;
2616
2617     /* -qq...: Do queue runs in a 2-stage manner */
2618
2619     if (*argrest == 'q')
2620       {
2621       queue_2stage = TRUE;
2622       argrest++;
2623       }
2624
2625     /* -qi...: Do only first (initial) deliveries */
2626
2627     if (*argrest == 'i')
2628       {
2629       queue_run_first_delivery = TRUE;
2630       argrest++;
2631       }
2632
2633     /* -qf...: Run the queue, forcing deliveries
2634        -qff..: Ditto, forcing thawing as well */
2635
2636     if (*argrest == 'f')
2637       {
2638       queue_run_force = TRUE;
2639       if (*(++argrest) == 'f')
2640         {
2641         deliver_force_thaw = TRUE;
2642         argrest++;
2643         }
2644       }
2645
2646     /* -q[f][f]l...: Run the queue only on local deliveries */
2647
2648     if (*argrest == 'l')
2649       {
2650       queue_run_local = TRUE;
2651       argrest++;
2652       }
2653
2654     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2655     optionally starting from a given message id. */
2656
2657     if (*argrest == 0 &&
2658         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2659       {
2660       queue_interval = 0;
2661       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2662         start_queue_run_id = argv[++i];
2663       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2664         stop_queue_run_id = argv[++i];
2665       }
2666
2667     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2668     optionally local only. */
2669
2670     else
2671       {
2672       if (*argrest != 0)
2673         queue_interval = readconf_readtime(argrest, 0, FALSE);
2674       else
2675         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2676       if (queue_interval <= 0)
2677         {
2678         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2679         exit(EXIT_FAILURE);
2680         }
2681       }
2682     break;
2683
2684
2685     case 'R':   /* Synonymous with -qR... */
2686     receiving_message = FALSE;
2687
2688     /* -Rf:   As -R (below) but force all deliveries,
2689        -Rff:  Ditto, but also thaw all frozen messages,
2690        -Rr:   String is regex
2691        -Rrf:  Regex and force
2692        -Rrff: Regex and force and thaw
2693
2694     in all cases provided there are no further characters in this
2695     argument. */
2696
2697     if (*argrest != 0)
2698       {
2699       int i;
2700       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2701         {
2702         if (Ustrcmp(argrest, rsopts[i]) == 0)
2703           {
2704           if (i != 2) queue_run_force = TRUE;
2705           if (i >= 2) deliver_selectstring_regex = TRUE;
2706           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2707           argrest += Ustrlen(rsopts[i]);
2708           }
2709         }
2710       }
2711
2712     /* -R: Set string to match in addresses for forced queue run to
2713     pick out particular messages. */
2714
2715     if (*argrest == 0)
2716       {
2717       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2718         {
2719         fprintf(stderr, "exim: string expected after -R\n");
2720         exit(EXIT_FAILURE);
2721         }
2722       }
2723     else deliver_selectstring = argrest;
2724     if (queue_interval < 0) queue_interval = 0;
2725     break;
2726
2727
2728     /* -r: an obsolete synonym for -f (see above) */
2729
2730
2731     /* -S: Like -R but works on sender. */
2732
2733     case 'S':   /* Synonymous with -qS... */
2734     receiving_message = FALSE;
2735
2736     /* -Sf:   As -S (below) but force all deliveries,
2737        -Sff:  Ditto, but also thaw all frozen messages,
2738        -Sr:   String is regex
2739        -Srf:  Regex and force
2740        -Srff: Regex and force and thaw
2741
2742     in all cases provided there are no further characters in this
2743     argument. */
2744
2745     if (*argrest != 0)
2746       {
2747       int i;
2748       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2749         {
2750         if (Ustrcmp(argrest, rsopts[i]) == 0)
2751           {
2752           if (i != 2) queue_run_force = TRUE;
2753           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2754           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2755           argrest += Ustrlen(rsopts[i]);
2756           }
2757         }
2758       }
2759
2760     /* -S: Set string to match in addresses for forced queue run to
2761     pick out particular messages. */
2762
2763     if (*argrest == 0)
2764       {
2765       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2766         {
2767         fprintf(stderr, "exim: string expected after -S\n");
2768         exit(EXIT_FAILURE);
2769         }
2770       }
2771     else deliver_selectstring_sender = argrest;
2772     if (queue_interval < 0) queue_interval = 0;
2773     break;
2774
2775     /* -Tqt is an option that is exclusively for use by the testing suite.
2776     It is not recognized in other circumstances. It allows for the setting up
2777     of explicit "queue times" so that various warning/retry things can be
2778     tested. Otherwise variability of clock ticks etc. cause problems. */
2779
2780     case 'T':
2781     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2782       fudged_queue_times = argv[++i];
2783     else badarg = TRUE;
2784     break;
2785
2786
2787     /* -t: Set flag to extract recipients from body of message. */
2788
2789     case 't':
2790     if (*argrest == 0) extract_recipients = TRUE;
2791
2792     /* -ti: Set flag to extract recipients from body of message, and also
2793     specify that dot does not end the message. */
2794
2795     else if (Ustrcmp(argrest, "i") == 0)
2796       {
2797       extract_recipients = TRUE;
2798       dot_ends = FALSE;
2799       }
2800
2801     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2802
2803     #ifdef SUPPORT_TLS
2804     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2805     #endif
2806
2807     else badarg = TRUE;
2808     break;
2809
2810
2811     /* -U: This means "initial user submission" in sendmail, apparently. The
2812     doc claims that in future sendmail may refuse syntactically invalid
2813     messages instead of fixing them. For the moment, we just ignore it. */
2814
2815     case 'U':
2816     break;
2817
2818
2819     /* -v: verify things - this is a very low-level debugging */
2820
2821     case 'v':
2822     if (*argrest == 0)
2823       {
2824       debug_selector |= D_v;
2825       debug_file = stderr;
2826       }
2827     else badarg = TRUE;
2828     break;
2829
2830
2831     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2832
2833       The -x flag tells the sendmail command that mail from a local
2834       mail program has National Language Support (NLS) extended characters
2835       in the body of the mail item. The sendmail command can send mail with
2836       extended NLS characters across networks that normally corrupts these
2837       8-bit characters.
2838
2839     As Exim is 8-bit clean, it just ignores this flag. */
2840
2841     case 'x':
2842     if (*argrest != 0) badarg = TRUE;
2843     break;
2844
2845     /* All other initial characters are errors */
2846
2847     default:
2848     badarg = TRUE;
2849     break;
2850     }         /* End of high-level switch statement */
2851
2852   /* Failed to recognize the option, or syntax error */
2853
2854   if (badarg)
2855     {
2856     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2857       "option %s\n", arg);
2858     exit(EXIT_FAILURE);
2859     }
2860   }
2861
2862
2863 /* Arguments have been processed. Check for incompatibilities. */
2864
2865 END_ARG:
2866 if ((
2867     (smtp_input || extract_recipients || recipients_arg < argc) &&
2868     (daemon_listen || queue_interval >= 0 || bi_option ||
2869       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2870       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2871     ) ||
2872     (
2873     msg_action_arg > 0 &&
2874     (daemon_listen || queue_interval >= 0 || list_options || checking ||
2875      bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2876     ) ||
2877     (
2878     (daemon_listen || queue_interval >= 0) &&
2879     (sender_address != NULL || list_options || list_queue || checking ||
2880      bi_option)
2881     ) ||
2882     (
2883     daemon_listen && queue_interval == 0
2884     ) ||
2885     (
2886     list_options &&
2887     (checking || smtp_input || extract_recipients ||
2888       filter_test != FTEST_NONE || bi_option)
2889     ) ||
2890     (
2891     verify_address_mode &&
2892     (address_test_mode || smtp_input || extract_recipients ||
2893       filter_test != FTEST_NONE || bi_option)
2894     ) ||
2895     (
2896     address_test_mode && (smtp_input || extract_recipients ||
2897       filter_test != FTEST_NONE || bi_option)
2898     ) ||
2899     (
2900     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2901       extract_recipients)
2902     ) ||
2903     (
2904     deliver_selectstring != NULL && queue_interval < 0
2905     )
2906    )
2907   {
2908   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2909   exit(EXIT_FAILURE);
2910   }
2911
2912 /* If debugging is set up, set the file and the file descriptor to pass on to
2913 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2914 to run in the foreground. */
2915
2916 if (debug_selector != 0)
2917   {
2918   debug_file = stderr;
2919   debug_fd = fileno(debug_file);
2920   background_daemon = FALSE;
2921   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
2922   if (debug_selector != D_v)    /* -v only doesn't show this */
2923     {
2924     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2925       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2926       debug_selector);
2927     show_whats_supported(stderr);
2928     }
2929   }
2930
2931 /* When started with root privilege, ensure that the limits on the number of
2932 open files and the number of processes (where that is accessible) are
2933 sufficiently large, or are unset, in case Exim has been called from an
2934 environment where the limits are screwed down. Not all OS have the ability to
2935 change some of these limits. */
2936
2937 if (unprivileged)
2938   {
2939   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2940   }
2941 else
2942   {
2943   struct rlimit rlp;
2944
2945   #ifdef RLIMIT_NOFILE
2946   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2947     {
2948     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2949       strerror(errno));
2950     rlp.rlim_cur = rlp.rlim_max = 0;
2951     }
2952
2953   /* I originally chose 1000 as a nice big number that was unlikely to
2954   be exceeded. It turns out that some older OS have a fixed upper limit of
2955   256. */
2956
2957   if (rlp.rlim_cur < 1000)
2958     {
2959     rlp.rlim_cur = rlp.rlim_max = 1000;
2960     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2961       {
2962       rlp.rlim_cur = rlp.rlim_max = 256;
2963       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2964         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2965           strerror(errno));
2966       }
2967     }
2968   #endif
2969
2970   #ifdef RLIMIT_NPROC
2971   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2972     {
2973     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2974       strerror(errno));
2975     rlp.rlim_cur = rlp.rlim_max = 0;
2976     }
2977
2978   #ifdef RLIM_INFINITY
2979   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2980     {
2981     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2982   #else
2983   if (rlp.rlim_cur < 1000)
2984     {
2985     rlp.rlim_cur = rlp.rlim_max = 1000;
2986   #endif
2987     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2988       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2989         strerror(errno));
2990     }
2991   #endif
2992   }
2993
2994 /* Exim is normally entered as root (but some special configurations are
2995 possible that don't do this). However, it always spins off sub-processes that
2996 set their uid and gid as required for local delivery. We don't want to pass on
2997 any extra groups that root may belong to, so we want to get rid of them all at
2998 this point.
2999
3000 We need to obey setgroups() at this stage, before possibly giving up root
3001 privilege for a changed configuration file, but later on we might need to
3002 check on the additional groups for the admin user privilege - can't do that
3003 till after reading the config, which might specify the exim gid. Therefore,
3004 save the group list here first. */
3005
3006 group_count = getgroups(NGROUPS_MAX, group_list);
3007
3008 /* There is a fundamental difference in some BSD systems in the matter of
3009 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3010 known not to be different. On the "different" systems there is a single group
3011 list, and the first entry in it is the current group. On all other versions of
3012 Unix there is a supplementary group list, which is in *addition* to the current
3013 group. Consequently, to get rid of all extraneous groups on a "standard" system
3014 you pass over 0 groups to setgroups(), while on a "different" system you pass
3015 over a single group - the current group, which is always the first group in the
3016 list. Calling setgroups() with zero groups on a "different" system results in
3017 an error return. The following code should cope with both types of system.
3018
3019 However, if this process isn't running as root, setgroups() can't be used
3020 since you have to be root to run it, even if throwing away groups. Not being
3021 root here happens only in some unusual configurations. We just ignore the
3022 error. */
3023
3024 if (setgroups(0, NULL) != 0)
3025   {
3026   if (setgroups(1, group_list) != 0 && !unprivileged)
3027     {
3028     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3029     exit(EXIT_FAILURE);
3030     }
3031   }
3032
3033 /* If the configuration file name has been altered by an argument on the
3034 command line (either a new file name or a macro definition) and the caller is
3035 not root or the exim user, or if this is a filter testing run, remove any
3036 setuid privilege the program has, and run as the underlying user.
3037
3038 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3039 severely restricts the use of -C for some purposes.
3040
3041 Otherwise, set the real ids to the effective values (should be root unless run
3042 from inetd, which it can either be root or the exim uid, if one is configured).
3043
3044 There is a private mechanism for bypassing some of this, in order to make it
3045 possible to test lots of configurations automatically, without having either to
3046 recompile each time, or to patch in an actual configuration file name and other
3047 values (such as the path name). If running in the test harness, pretend that
3048 configuration file changes and macro definitions haven't happened. */
3049
3050 if ((                                            /* EITHER */
3051     (config_changed || macros != NULL) &&        /* Config changed, and */
3052     real_uid != root_uid &&                      /* Not root, and */
3053     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
3054     real_uid != exim_uid &&                      /* Not exim, and */
3055     #endif
3056     !running_in_test_harness                     /* Not fudged */
3057     ) ||                                         /*   OR   */
3058     expansion_test                               /* expansion testing */
3059     ||                                           /*   OR   */
3060     filter_test != FTEST_NONE)                   /* Filter testing */
3061   {
3062   setgroups(group_count, group_list);
3063   exim_setugid(real_uid, real_gid, FALSE,
3064     US"-C, -D, -be or -bf forces real uid");
3065   removed_privilege = TRUE;
3066
3067   /* In the normal case when Exim is called like this, stderr is available
3068   and should be used for any logging information because attempts to write
3069   to the log will usually fail. To arrange this, we unset really_exim. However,
3070   if no stderr is available there is no point - we might as well have a go
3071   at the log (if it fails, syslog will be written). */
3072
3073   if (log_stderr != NULL) really_exim = FALSE;
3074   }
3075
3076 /* Privilege is to be retained for the moment. It may be dropped later,
3077 depending on the job that this Exim process has been asked to do. For now, set
3078 the real uid to the effective so that subsequent re-execs of Exim are done by a
3079 privileged user. */
3080
3081 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3082
3083 /* If testing a filter, open the file(s) now, before wasting time doing other
3084 setups and reading the message. */
3085
3086 if ((filter_test & FTEST_SYSTEM) != 0)
3087   {
3088   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3089   if (filter_sfd < 0)
3090     {
3091     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3092       strerror(errno));
3093     return EXIT_FAILURE;
3094     }
3095   }
3096
3097 if ((filter_test & FTEST_USER) != 0)
3098   {
3099   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3100   if (filter_ufd < 0)
3101     {
3102     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3103       strerror(errno));
3104     return EXIT_FAILURE;
3105     }
3106   }
3107
3108 /* Read the main runtime configuration data; this gives up if there
3109 is a failure. It leaves the configuration file open so that the subsequent
3110 configuration data for delivery can be read if needed. */
3111
3112 readconf_main();
3113
3114 /* Handle the decoding of logging options. */
3115
3116 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3117   log_options, log_options_count, US"log");
3118
3119 DEBUG(D_any)
3120   {
3121   debug_printf("configuration file is %s\n", config_main_filename);
3122   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3123     log_extra_selector);
3124   }
3125
3126 /* If domain literals are not allowed, check the sender address that was
3127 supplied with -f. Ditto for a stripped trailing dot. */
3128
3129 if (sender_address != NULL)
3130   {
3131   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3132     {
3133     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3134       "allowed\n", sender_address);
3135     return EXIT_FAILURE;
3136     }
3137   if (f_end_dot && !strip_trailing_dot)
3138     {
3139     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3140       "(trailing dot not allowed)\n", sender_address);
3141     return EXIT_FAILURE;
3142     }
3143   }
3144
3145 /* Paranoia check of maximum lengths of certain strings. There is a check
3146 on the length of the log file path in log.c, which will come into effect
3147 if there are any calls to write the log earlier than this. However, if we
3148 get this far but the string is very long, it is better to stop now than to
3149 carry on and (e.g.) receive a message and then have to collapse. The call to
3150 log_write() from here will cause the ultimate panic collapse if the complete
3151 file name exceeds the buffer length. */
3152
3153 if (Ustrlen(log_file_path) > 200)
3154   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3155     "log_file_path is longer than 200 chars: aborting");
3156
3157 if (Ustrlen(pid_file_path) > 200)
3158   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3159     "pid_file_path is longer than 200 chars: aborting");
3160
3161 if (Ustrlen(spool_directory) > 200)
3162   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3163     "spool_directory is longer than 200 chars: aborting");
3164
3165 /* Length check on the process name given to syslog for its TAG field,
3166 which is only permitted to be 32 characters or less. See RFC 3164. */
3167
3168 if (Ustrlen(syslog_processname) > 32)
3169   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3170     "syslog_processname is longer than 32 chars: aborting");
3171
3172 /* In some operating systems, the environment variable TMPDIR controls where
3173 temporary files are created; Exim doesn't use these (apart from when delivering
3174 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3175 If TMPDIR is found in the environment, reset it to the value defined in the
3176 TMPDIR macro, if this macro is defined. */
3177
3178 #ifdef TMPDIR
3179   {
3180   uschar **p;
3181   for (p = USS environ; *p != NULL; p++)
3182     {
3183     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3184         Ustrcmp(*p+7, TMPDIR) != 0)
3185       {
3186       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3187       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3188       *p = newp;
3189       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3190       }
3191     }
3192   }
3193 #endif
3194
3195 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3196 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3197 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3198 called by a user who has set the TZ variable. This then affects the timestamps
3199 in log files and in Received: headers, and any created Date: header lines. The
3200 required timezone is settable in the configuration file, so nothing can be done
3201 about this earlier - but hopefully nothing will normally be logged earlier than
3202 this. We have to make a new environment if TZ is wrong, but don't bother if
3203 timestamps_utc is set, because then all times are in UTC anyway. */
3204
3205 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3206   {
3207   timestamps_utc = TRUE;
3208   }
3209 else
3210   {
3211   uschar *envtz = US getenv("TZ");
3212   if ((envtz == NULL && timezone_string != NULL) ||
3213       (envtz != NULL &&
3214         (timezone_string == NULL ||
3215          Ustrcmp(timezone_string, envtz) != 0)))
3216     {
3217     uschar **p = USS environ;
3218     uschar **new;
3219     uschar **newp;
3220     int count = 0;
3221     while (*p++ != NULL) count++;
3222     if (envtz == NULL) count++;
3223     newp = new = malloc(sizeof(uschar *) * (count + 1));
3224     for (p = USS environ; *p != NULL; p++)
3225       {
3226       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3227       *newp++ = *p;
3228       }
3229     if (timezone_string != NULL)
3230       {
3231       *newp = malloc(Ustrlen(timezone_string) + 4);
3232       sprintf(CS *newp++, "TZ=%s", timezone_string);
3233       }
3234     *newp = NULL;
3235     environ = CSS new;
3236     tzset();
3237     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3238       tod_stamp(tod_log));
3239     }
3240   }
3241
3242 /* Handle the case when we have removed the setuid privilege because of -C or
3243 -D. This means that the caller of Exim was not root, and, provided that
3244 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3245 the binary.
3246
3247 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3248 were running as the exim user defined in the configuration file (different to
3249 the one in the binary). The sysadmin may expect this case to retain privilege
3250 because "the binary was called by the Exim user", but it hasn't, because of the
3251 order in which it handles this stuff. There are two possibilities:
3252
3253   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3254       to do message deliveries. Thus, the fact that it is running as a
3255       non-privileged user is plausible, and might be wanted in some special
3256       configurations. However, really_exim will have been set false when
3257       privilege was dropped, to stop Exim trying to write to its normal log
3258       files. Therefore, re-enable normal log processing, assuming the sysadmin
3259       has set up the log directory correctly.
3260
3261   (2) If deliver_drop_privilege is not set, the configuration won't work as
3262       apparently intended, and so we log a panic message. In order to retain
3263       root for -C or -D, the caller must either be root or the Exim user
3264       defined in the binary (when deliver_drop_ privilege is false).
3265
3266 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3267 built-in exim user or one defined in the configuration. In either event,
3268 re-enable log processing, assuming the sysadmin knows what they are doing. */
3269
3270 if (removed_privilege && (config_changed || macros != NULL) &&
3271     real_uid == exim_uid)
3272   {
3273   #ifdef ALT_CONFIG_ROOT_ONLY
3274   really_exim = TRUE;   /* let logging work normally */
3275   #else
3276
3277   if (deliver_drop_privilege)
3278     really_exim = TRUE; /* let logging work normally */
3279   else
3280     log_write(0, LOG_MAIN|LOG_PANIC,
3281       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3282       (int)exim_uid, config_changed? "-C" : "-D");
3283   #endif
3284   }
3285
3286 /* Start up Perl interpreter if Perl support is configured and there is a
3287 perl_startup option, and the configuration or the command line specifies
3288 initializing starting. Note that the global variables are actually called
3289 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3290
3291 #ifdef EXIM_PERL
3292 if (perl_start_option != 0)
3293   opt_perl_at_start = (perl_start_option > 0);
3294 if (opt_perl_at_start && opt_perl_startup != NULL)
3295   {
3296   uschar *errstr;
3297   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3298   errstr = init_perl(opt_perl_startup);
3299   if (errstr != NULL)
3300     {
3301     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3302     return EXIT_FAILURE;
3303     }
3304   opt_perl_started = TRUE;
3305   }
3306 #endif /* EXIM_PERL */
3307
3308 /* Log the arguments of the call if the configuration file said so. This is
3309 a debugging feature for finding out what arguments certain MUAs actually use.
3310 Don't attempt it if logging is disabled, or if listing variables or if
3311 verifying/testing addresses or expansions. */
3312
3313 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3314       && really_exim && !list_options && !checking)
3315   {
3316   int i;
3317   uschar *p = big_buffer;
3318   Ustrcpy(p, "cwd=");
3319   (void)getcwd(CS p+4, big_buffer_size - 4);
3320   while (*p) p++;
3321   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3322   while (*p) p++;
3323   for (i = 0; i < argc; i++)
3324     {
3325     int len = Ustrlen(argv[i]);
3326     uschar *printing;
3327     uschar *quote;
3328     if (p + len + 8 >= big_buffer + big_buffer_size)
3329       {
3330       Ustrcpy(p, " ...");
3331       log_write(0, LOG_MAIN, "%s", big_buffer);
3332       Ustrcpy(big_buffer, "...");
3333       p = big_buffer + 3;
3334       }
3335     printing = string_printing(argv[i]);
3336     if (printing[0] == 0) quote = US"\""; else
3337       {
3338       uschar *pp = printing;
3339       quote = US"";
3340       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3341       }
3342     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3343       (p - big_buffer) - 4), printing, quote);
3344     while (*p) p++;
3345     }
3346
3347   if ((log_extra_selector & LX_arguments) != 0)
3348     log_write(0, LOG_MAIN, "%s", big_buffer);
3349   else
3350     debug_printf("%s\n", big_buffer);
3351   }
3352
3353 /* Set the working directory to be the top-level spool directory. We don't rely
3354 on this in the code, which always uses fully qualified names, but it's useful
3355 for core dumps etc. Don't complain if it fails - the spool directory might not
3356 be generally accessible and calls with the -C option (and others) have lost
3357 privilege by now. Before the chdir, we try to ensure that the directory exists.
3358 */
3359
3360 if (Uchdir(spool_directory) != 0)
3361   {
3362   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3363   (void)Uchdir(spool_directory);
3364   }
3365
3366 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3367 alias file. Exim doesn't have such a concept, but this call is screwed into
3368 Sun's YP makefiles. Handle this by calling a configured script, as the real
3369 user who called Exim. The -oA option can be used to pass an argument to the
3370 script. */
3371
3372 if (bi_option)
3373   {
3374   (void)fclose(config_file);
3375   if (bi_command != NULL)
3376     {
3377     int i = 0;
3378     uschar *argv[3];
3379     argv[i++] = bi_command;
3380     if (alias_arg != NULL) argv[i++] = alias_arg;
3381     argv[i++] = NULL;
3382
3383     setgroups(group_count, group_list);
3384     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3385
3386     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3387       (argv[1] == NULL)? US"" : argv[1]);
3388
3389     execv(CS argv[0], (char *const *)argv);
3390     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3391     exit(EXIT_FAILURE);
3392     }
3393   else
3394     {
3395     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3396     exit(EXIT_SUCCESS);
3397     }
3398   }
3399
3400 /* If an action on specific messages is requested, or if a daemon or queue
3401 runner is being started, we need to know if Exim was called by an admin user.
3402 This is the case if the real user is root or exim, or if the real group is
3403 exim, or if one of the supplementary groups is exim or a group listed in
3404 admin_groups. We don't fail all message actions immediately if not admin_user,
3405 since some actions can be performed by non-admin users. Instead, set admin_user
3406 for later interrogation. */
3407
3408 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3409   admin_user = TRUE;
3410 else
3411   {
3412   int i, j;
3413
3414   for (i = 0; i < group_count; i++)
3415     {
3416     if (group_list[i] == exim_gid) admin_user = TRUE;
3417     else if (admin_groups != NULL)
3418       {
3419       for (j = 1; j <= (int)(admin_groups[0]); j++)
3420         if (admin_groups[j] == group_list[i])
3421           { admin_user = TRUE; break; }
3422       }
3423     if (admin_user) break;
3424     }
3425   }
3426
3427 /* Another group of privileged users are the trusted users. These are root,
3428 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3429 are permitted to specify sender_addresses with -f on the command line, and
3430 other message parameters as well. */
3431
3432 if (real_uid == root_uid || real_uid == exim_uid)
3433   trusted_caller = TRUE;
3434 else
3435   {
3436   int i, j;
3437
3438   if (trusted_users != NULL)
3439     {
3440     for (i = 1; i <= (int)(trusted_users[0]); i++)
3441       if (trusted_users[i] == real_uid)
3442         { trusted_caller = TRUE; break; }
3443     }
3444
3445   if (!trusted_caller && trusted_groups != NULL)
3446     {
3447     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3448       {
3449       if (trusted_groups[i] == real_gid)
3450         trusted_caller = TRUE;
3451       else for (j = 0; j < group_count; j++)
3452         {
3453         if (trusted_groups[i] == group_list[j])
3454           { trusted_caller = TRUE; break; }
3455         }
3456       if (trusted_caller) break;
3457       }
3458     }
3459   }
3460
3461 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3462 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3463
3464 /* Only an admin user may start the daemon or force a queue run in the default
3465 configuration, but the queue run restriction can be relaxed. Only an admin
3466 user may request that a message be returned to its sender forthwith. Only an
3467 admin user may specify a debug level greater than D_v (because it might show
3468 passwords, etc. in lookup queries). Only an admin user may request a queue
3469 count. */
3470
3471 if (!admin_user)
3472   {
3473   BOOL debugset = (debug_selector & ~D_v) != 0;
3474   if (deliver_give_up || daemon_listen ||
3475      (count_queue && queue_list_requires_admin) ||
3476      (list_queue && queue_list_requires_admin) ||
3477      (queue_interval >= 0 && prod_requires_admin) ||
3478      (debugset && !running_in_test_harness))
3479     {
3480     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3481     exit(EXIT_FAILURE);
3482     }
3483   }
3484
3485 /* If the real user is not root or the exim uid, the argument for passing
3486 in an open TCP/IP connection for another message is not permitted, nor is
3487 running with the -N option for any delivery action, unless this call to exim is
3488 one that supplied an input message, or we are using a patched exim for
3489 regression testing. */
3490
3491 if (real_uid != root_uid && real_uid != exim_uid &&
3492      (continue_hostname != NULL ||
3493        (dont_deliver &&
3494          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3495        )) && !running_in_test_harness)
3496   {
3497   fprintf(stderr, "exim: Permission denied\n");
3498   return EXIT_FAILURE;
3499   }
3500
3501 /* If the caller is not trusted, certain arguments are ignored when running for
3502 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3503 Note that authority for performing certain actions on messages is tested in the
3504 queue_action() function. */
3505
3506 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3507   {
3508   sender_host_name = sender_host_address = interface_address =
3509     sender_ident = received_protocol = NULL;
3510   sender_host_port = interface_port = 0;
3511   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3512   }
3513
3514 /* If a sender host address is set, extract the optional port number off the
3515 end of it and check its syntax. Do the same thing for the interface address.
3516 Exim exits if the syntax is bad. */
3517
3518 else
3519   {
3520   if (sender_host_address != NULL)
3521     sender_host_port = check_port(sender_host_address);
3522   if (interface_address != NULL)
3523     interface_port = check_port(interface_address);
3524   }
3525
3526 /* If an SMTP message is being received check to see if the standard input is a
3527 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3528 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3529 barf. */
3530
3531 if (smtp_input)
3532   {
3533   union sockaddr_46 inetd_sock;
3534   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3535   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3536     {
3537     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3538     if (family == AF_INET || family == AF_INET6)
3539       {
3540       union sockaddr_46 interface_sock;
3541       size = sizeof(interface_sock);
3542
3543       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3544         interface_address = host_ntoa(-1, &interface_sock, NULL,
3545           &interface_port);
3546
3547       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3548
3549       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3550         {
3551         is_inetd = TRUE;
3552         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3553           NULL, &sender_host_port);
3554         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3555           "inetd is not supported when mua_wrapper is set");
3556         }
3557       else
3558         {
3559         fprintf(stderr,
3560           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3561         return EXIT_FAILURE;
3562         }
3563       }
3564     }
3565   }
3566
3567 /* If the load average is going to be needed while receiving a message, get it
3568 now for those OS that require the first call to os_getloadavg() to be done as
3569 root. There will be further calls later for each message received. */
3570
3571 #ifdef LOAD_AVG_NEEDS_ROOT
3572 if (receiving_message &&
3573       (queue_only_load >= 0 ||
3574         (is_inetd && smtp_load_reserve >= 0)
3575       ))
3576   {
3577   load_average = os_getloadavg();
3578   }
3579 #endif
3580
3581 /* The queue_only configuration option can be overridden by -odx on the command
3582 line, except that if queue_only_override is false, queue_only cannot be unset
3583 from the command line. */
3584
3585 if (queue_only_set && (queue_only_override || arg_queue_only))
3586   queue_only = arg_queue_only;
3587
3588 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3589 -or and -os. */
3590
3591 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3592 if (arg_smtp_receive_timeout >= 0)
3593   smtp_receive_timeout = arg_smtp_receive_timeout;
3594
3595 /* If Exim was started with root privilege, unless we have already removed the
3596 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3597 except when starting the daemon or doing some kind of delivery or address
3598 testing (-bt). These are the only cases when root need to be retained. We run
3599 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3600 retained only for starting the daemon. We always do the initgroups() in this
3601 situation (controlled by the TRUE below), in order to be as close as possible
3602 to the state Exim usually runs in. */
3603
3604 if (!unprivileged &&                      /* originally had root AND */
3605     !removed_privilege &&                 /* still got root AND      */
3606     !daemon_listen &&                     /* not starting the daemon */
3607     queue_interval <= 0 &&                /* (either kind of daemon) */
3608       (                                   /*    AND EITHER           */
3609       deliver_drop_privilege ||           /* requested unprivileged  */
3610         (                                 /*       OR                */
3611         queue_interval < 0 &&             /* not running the queue   */
3612         (msg_action_arg < 0 ||            /*       and               */
3613           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3614         (!checking || !address_test_mode) /* not address checking    */
3615         )
3616       ))
3617   {
3618   exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3619   }
3620
3621 /* When we are retaining a privileged uid, we still change to the exim gid. */
3622
3623 else setgid(exim_gid);
3624
3625 /* Handle a request to list the delivery queue */
3626
3627 if (list_queue)
3628   {
3629   set_process_info("listing the queue");
3630   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3631   exit(EXIT_SUCCESS);
3632   }
3633
3634 /* Handle a request to count the delivery queue */
3635
3636 if (count_queue)
3637   {
3638   set_process_info("counting the queue");
3639   queue_count();
3640   exit(EXIT_SUCCESS);
3641   }
3642
3643 /* Handle actions on specific messages, except for the force delivery action,
3644 which is done below. Some actions take a whole list of message ids, which
3645 are known to continue up to the end of the arguments. Others take a single
3646 message id and then operate on the recipients list. */
3647
3648 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3649   {
3650   int yield = EXIT_SUCCESS;
3651   set_process_info("acting on specified messages");
3652
3653   if (!one_msg_action)
3654     {
3655     for (i = msg_action_arg; i < argc; i++)
3656       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3657         yield = EXIT_FAILURE;
3658     }
3659
3660   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3661     recipients_arg)) yield = EXIT_FAILURE;
3662   exit(yield);
3663   }
3664
3665 /* All the modes below here require the remaining configuration sections
3666 to be read, except that we can skip over the ACL setting when delivering
3667 specific messages, or doing a queue run. (For various testing cases we could
3668 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3669 for skipping. */
3670
3671 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3672
3673 /* The configuration data will have been read into POOL_PERM because we won't
3674 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3675 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3676 configuration were read into POOL_MAIN, because we don't do any resets till
3677 later on. However, it seems right, and it does ensure that both pools get used.
3678 */
3679
3680 store_pool = POOL_MAIN;
3681
3682 /* Handle the -brt option. This is for checking out retry configurations.
3683 The next three arguments are a domain name or a complete address, and
3684 optionally two error numbers. All it does is to call the function that
3685 scans the retry configuration data. */
3686
3687 if (test_retry_arg >= 0)
3688   {
3689   retry_config *yield;
3690   int basic_errno = 0;
3691   int more_errno = 0;
3692   uschar *s1, *s2;
3693
3694   if (test_retry_arg >= argc)
3695     {
3696     printf("-brt needs a domain or address argument\n");
3697     exim_exit(EXIT_FAILURE);
3698     }
3699   s1 = argv[test_retry_arg++];
3700   s2 = NULL;
3701
3702   /* If the first argument contains no @ and no . it might be a local user
3703   or it might be a single-component name. Treat as a domain. */
3704
3705   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3706     {
3707     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3708       "being \ntreated as a one-component domain, not as a local part.\n\n",
3709       s1);
3710     }
3711
3712   /* There may be an optional second domain arg. */
3713
3714   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3715     s2 = argv[test_retry_arg++];
3716
3717   /* The final arg is an error name */
3718
3719   if (test_retry_arg < argc)
3720     {
3721     uschar *ss = argv[test_retry_arg];
3722     uschar *error =
3723       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3724     if (error != NULL)
3725       {
3726       printf("%s\n", CS error);
3727       return EXIT_FAILURE;
3728       }
3729
3730     /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3731     code > 100 as an error is for matching codes to the decade. Turn them into
3732     a real error code, off the decade. */
3733
3734     if (basic_errno == ERRNO_MAIL4XX ||
3735         basic_errno == ERRNO_RCPT4XX ||
3736         basic_errno == ERRNO_DATA4XX)
3737       {
3738       int code = (more_errno >> 8) & 255;
3739       if (code == 255)
3740         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3741       else if (code > 100)
3742         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3743       }
3744     }
3745
3746   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3747   if (yield == NULL) printf("No retry information found\n"); else
3748     {
3749     retry_rule *r;
3750     more_errno = yield->more_errno;
3751     printf("Retry rule: %s  ", yield->pattern);
3752
3753     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3754       {
3755       printf("quota%s%s  ",
3756         (more_errno > 0)? "_" : "",
3757         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3758       }
3759     else if (yield->basic_errno == ECONNREFUSED)
3760       {
3761       printf("refused%s%s  ",
3762         (more_errno > 0)? "_" : "",
3763         (more_errno == 'M')? "MX" :
3764         (more_errno == 'A')? "A" : "");
3765       }
3766     else if (yield->basic_errno == ETIMEDOUT)
3767       {
3768       printf("timeout");
3769       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3770       more_errno &= 255;
3771       if (more_errno != 0) printf("_%s",
3772         (more_errno == 'M')? "MX" : "A");
3773       printf("  ");
3774       }
3775     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3776       printf("auth_failed  ");
3777     else printf("*  ");
3778
3779     for (r = yield->rules; r != NULL; r = r->next)
3780       {
3781       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3782       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3783       if (r->rule == 'G')
3784         {
3785         int x = r->p2;
3786         int f = x % 1000;
3787         int d = 100;
3788         printf(",%d.", x/1000);
3789         do
3790           {
3791           printf("%d", f/d);
3792           f %= d;
3793           d /= 10;
3794           }
3795         while (f != 0);
3796         }
3797       printf("; ");
3798       }
3799
3800     printf("\n");
3801     }
3802   exim_exit(EXIT_SUCCESS);
3803   }
3804
3805 /* Handle a request to list one or more configuration options */
3806
3807 if (list_options)
3808   {
3809   set_process_info("listing variables");
3810   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3811     else for (i = recipients_arg; i < argc; i++)
3812       {
3813       if (i < argc - 1 &&
3814           (Ustrcmp(argv[i], "router") == 0 ||
3815            Ustrcmp(argv[i], "transport") == 0 ||
3816            Ustrcmp(argv[i], "authenticator") == 0))
3817         {
3818         readconf_print(argv[i+1], argv[i]);
3819         i++;
3820         }
3821       else readconf_print(argv[i], NULL);
3822       }
3823   exim_exit(EXIT_SUCCESS);
3824   }
3825
3826
3827 /* Handle a request to deliver one or more messages that are already on the
3828 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3829 is typically used for a small number when prodding by hand (when the option
3830 forced_delivery will be set) or when re-execing to regain root privilege.
3831 Each message delivery must happen in a separate process, so we fork a process
3832 for each one, and run them sequentially so that debugging output doesn't get
3833 intertwined, and to avoid spawning too many processes if a long list is given.
3834 However, don't fork for the last one; this saves a process in the common case
3835 when Exim is called to deliver just one message. */
3836
3837 if (msg_action_arg > 0)
3838   {
3839   if (prod_requires_admin && !admin_user)
3840     {
3841     fprintf(stderr, "exim: Permission denied\n");
3842     exim_exit(EXIT_FAILURE);
3843     }
3844   set_process_info("delivering specified messages");
3845   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3846   for (i = msg_action_arg; i < argc; i++)
3847     {
3848     int status;
3849     pid_t pid;
3850     if (i == argc - 1)
3851       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3852     else if ((pid = fork()) == 0)
3853       {
3854       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3855       _exit(EXIT_SUCCESS);
3856       }
3857     else if (pid < 0)
3858       {
3859       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3860         strerror(errno));
3861       exim_exit(EXIT_FAILURE);
3862       }
3863     else wait(&status);
3864     }
3865   exim_exit(EXIT_SUCCESS);
3866   }
3867
3868
3869 /* If only a single queue run is requested, without SMTP listening, we can just
3870 turn into a queue runner, with an optional starting message id. */
3871
3872 if (queue_interval == 0 && !daemon_listen)
3873   {
3874   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3875     (start_queue_run_id == NULL)? US"" : US" starting at ",
3876     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3877     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
3878     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
3879   set_process_info("running the queue (single queue run)");
3880   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3881   exim_exit(EXIT_SUCCESS);
3882   }
3883
3884
3885 /* Find the login name of the real user running this process. This is always
3886 needed when receiving a message, because it is written into the spool file. It
3887 may also be used to construct a from: or a sender: header, and in this case we
3888 need the user's full name as well, so save a copy of it, checked for RFC822
3889 syntax and munged if necessary, if it hasn't previously been set by the -F
3890 argument. We may try to get the passwd entry more than once, in case NIS or
3891 other delays are in evidence. Save the home directory for use in filter testing
3892 (only). */
3893
3894 for (i = 0;;)
3895   {
3896   if ((pw = getpwuid(real_uid)) != NULL)
3897     {
3898     originator_login = string_copy(US pw->pw_name);
3899     originator_home = string_copy(US pw->pw_dir);
3900
3901     /* If user name has not been set by -F, set it from the passwd entry
3902     unless -f has been used to set the sender address by a trusted user. */
3903
3904     if (originator_name == NULL)
3905       {
3906       if (sender_address == NULL ||
3907            (!trusted_caller && filter_test == FTEST_NONE))
3908         {
3909         uschar *name = US pw->pw_gecos;
3910         uschar *amp = Ustrchr(name, '&');
3911         uschar buffer[256];
3912
3913         /* Most Unix specify that a '&' character in the gecos field is
3914         replaced by a copy of the login name, and some even specify that
3915         the first character should be upper cased, so that's what we do. */
3916
3917         if (amp != NULL)
3918           {
3919           int loffset;
3920           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3921             amp - name, name, &loffset, originator_login, amp + 1);
3922           buffer[loffset] = toupper(buffer[loffset]);
3923           name = buffer;
3924           }
3925
3926         /* If a pattern for matching the gecos field was supplied, apply
3927         it and then expand the name string. */
3928
3929         if (gecos_pattern != NULL && gecos_name != NULL)
3930           {
3931           const pcre *re;
3932           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3933
3934           if (regex_match_and_setup(re, name, 0, -1))
3935             {
3936             uschar *new_name = expand_string(gecos_name);
3937             expand_nmax = -1;
3938             if (new_name != NULL)
3939               {
3940               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3941                 "gecos field \"%s\"\n", new_name, name);
3942               name = new_name;
3943               }
3944             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3945               "\"%s\": %s\n", gecos_name, expand_string_message);
3946             }
3947           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3948             "gecos field \"%s\"\n", gecos_pattern, name);
3949           store_free((void *)re);
3950           }
3951         originator_name = string_copy(name);
3952         }
3953
3954       /* A trusted caller has used -f but not -F */
3955
3956       else originator_name = US"";
3957       }
3958
3959     /* Break the retry loop */
3960
3961     break;
3962     }
3963
3964   if (++i > finduser_retries) break;
3965   sleep(1);
3966   }
3967
3968 /* If we cannot get a user login, log the incident and give up, unless the
3969 configuration specifies something to use. When running in the test harness,
3970 any setting of unknown_login overrides the actual name. */
3971
3972 if (originator_login == NULL || running_in_test_harness)
3973   {
3974   if (unknown_login != NULL)
3975     {
3976     originator_login = expand_string(unknown_login);
3977     if (originator_name == NULL && unknown_username != NULL)
3978       originator_name = expand_string(unknown_username);
3979     if (originator_name == NULL) originator_name = US"";
3980     }
3981   if (originator_login == NULL)
3982     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3983       (int)real_uid);
3984   }
3985
3986 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3987 RFC822 address.*/
3988
3989 originator_name = string_copy(parse_fix_phrase(originator_name,
3990   Ustrlen(originator_name), big_buffer, big_buffer_size));
3991
3992 /* If a message is created by this call of Exim, the uid/gid of its originator
3993 are those of the caller. These values are overridden if an existing message is
3994 read in from the spool. */
3995
3996 originator_uid = real_uid;
3997 originator_gid = real_gid;
3998
3999 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4000   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4001
4002 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4003 returns. We leave this till here so that the originator_ fields are available
4004 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4005 mode. */
4006
4007 if (daemon_listen || queue_interval > 0)
4008   {
4009   if (mua_wrapper)
4010     {
4011     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4012     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4013       "mua_wrapper is set");
4014     }
4015   daemon_go();
4016   }
4017
4018 /* If the sender ident has not been set (by a trusted caller) set it to
4019 the caller. This will get overwritten below for an inetd call. If a trusted
4020 caller has set it empty, unset it. */
4021
4022 if (sender_ident == NULL) sender_ident = originator_login;
4023   else if (sender_ident[0] == 0) sender_ident = NULL;
4024
4025 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4026 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4027 originator_* variables set. */
4028
4029 if (test_rewrite_arg >= 0)
4030   {
4031   really_exim = FALSE;
4032   if (test_rewrite_arg >= argc)
4033     {
4034     printf("-brw needs an address argument\n");
4035     exim_exit(EXIT_FAILURE);
4036     }
4037   rewrite_test(argv[test_rewrite_arg]);
4038   exim_exit(EXIT_SUCCESS);
4039   }
4040
4041 /* A locally-supplied message is considered to be coming from a local user
4042 unless a trusted caller supplies a sender address with -f, or is passing in the
4043 message via SMTP (inetd invocation or otherwise). */
4044
4045 if ((sender_address == NULL && !smtp_input) ||
4046     (!trusted_caller && filter_test == FTEST_NONE))
4047   {
4048   sender_local = TRUE;
4049
4050   /* A trusted caller can supply authenticated_sender and authenticated_id
4051   via -oMas and -oMai and if so, they will already be set. */
4052
4053   if (authenticated_sender == NULL)
4054     authenticated_sender = string_sprintf("%s@%s", originator_login,
4055       qualify_domain_sender);
4056   if (authenticated_id == NULL) authenticated_id = originator_login;
4057   }
4058
4059 /* Trusted callers are always permitted to specify the sender address.
4060 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4061 is specified is the empty address. However, if a trusted caller does not
4062 specify a sender address for SMTP input, we leave sender_address unset. This
4063 causes the MAIL commands to be honoured. */
4064
4065 if ((!smtp_input && sender_address == NULL) ||
4066     !receive_check_set_sender(sender_address))
4067   {
4068   /* Either the caller is not permitted to set a general sender, or this is
4069   non-SMTP input and the trusted caller has not set a sender. If there is no
4070   sender, or if a sender other than <> is set, override with the originator's
4071   login (which will get qualified below), except when checking things. */
4072
4073   if (sender_address == NULL             /* No sender_address set */
4074        ||                                /*         OR            */
4075        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4076        !checking &&                      /* Not running tests, AND */
4077        filter_test == FTEST_NONE))       /* Not testing a filter */
4078     {
4079     sender_address = originator_login;
4080     sender_address_forced = FALSE;
4081     sender_address_domain = 0;
4082     }
4083   }
4084
4085 /* Remember whether an untrusted caller set the sender address */
4086
4087 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4088
4089 /* Ensure that the sender address is fully qualified unless it is the empty
4090 address, which indicates an error message, or doesn't exist (root caller, smtp
4091 interface, no -f argument). */
4092
4093 if (sender_address != NULL && sender_address[0] != 0 &&
4094     sender_address_domain == 0)
4095   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4096     qualify_domain_sender);
4097
4098 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4099
4100 /* Handle a request to verify a list of addresses, or test them for delivery.
4101 This must follow the setting of the sender address, since routers can be
4102 predicated upon the sender. If no arguments are given, read addresses from
4103 stdin. Set debug_level to at least D_v to get full output for address testing.
4104 */
4105
4106 if (verify_address_mode || address_test_mode)
4107   {
4108   int exit_value = 0;
4109   int flags = vopt_qualify;
4110
4111   if (verify_address_mode)
4112     {
4113     if (!verify_as_sender) flags |= vopt_is_recipient;
4114     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4115     }
4116
4117   else
4118     {
4119     flags |= vopt_is_recipient;
4120     debug_selector |= D_v;
4121     debug_file = stderr;
4122     debug_fd = fileno(debug_file);
4123     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4124     }
4125
4126   if (recipients_arg < argc)
4127     {
4128     while (recipients_arg < argc)
4129       {
4130       uschar *s = argv[recipients_arg++];
4131       while (*s != 0)
4132         {
4133         BOOL finished = FALSE;
4134         uschar *ss = parse_find_address_end(s, FALSE);
4135         if (*ss == ',') *ss = 0; else finished = TRUE;
4136         test_address(s, flags, &exit_value);
4137         s = ss;
4138         if (!finished)
4139           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4140         }
4141       }
4142     }
4143
4144   else for (;;)
4145     {
4146     uschar *s = get_stdinput(NULL, NULL);
4147     if (s == NULL) break;
4148     test_address(s, flags, &exit_value);
4149     }
4150
4151   route_tidyup();
4152   exim_exit(exit_value);
4153   }
4154
4155 /* Handle expansion checking */
4156
4157 if (expansion_test)
4158   {
4159   if (recipients_arg < argc)
4160     {
4161     while (recipients_arg < argc)
4162       {
4163       uschar *s = argv[recipients_arg++];
4164       uschar *ss = expand_string(s);
4165       if (ss == NULL)
4166         printf ("Failed: %s\n", expand_string_message);
4167       else printf("%s\n", CS ss);
4168       }
4169     }
4170
4171   /* Read stdin */
4172
4173   else
4174     {
4175     char *(*fn_readline)(char *) = NULL;
4176     char *(*fn_addhist)(char *) = NULL;
4177
4178     #ifdef USE_READLINE
4179     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4180     #endif
4181
4182     for (;;)
4183       {
4184       uschar *ss;
4185       uschar *source = get_stdinput(fn_readline, fn_addhist);
4186       if (source == NULL) break;
4187       ss = expand_string(source);
4188       if (ss == NULL)
4189         printf ("Failed: %s\n", expand_string_message);
4190       else printf("%s\n", CS ss);
4191       }
4192
4193     #ifdef USE_READLINE
4194     if (dlhandle != NULL) dlclose(dlhandle);
4195     #endif
4196     }
4197
4198   exim_exit(EXIT_SUCCESS);
4199   }
4200
4201
4202 /* The active host name is normally the primary host name, but it can be varied
4203 for hosts that want to play several parts at once. We need to ensure that it is
4204 set for host checking, and for receiving messages. */
4205
4206 smtp_active_hostname = primary_hostname;
4207 if (raw_active_hostname != NULL)
4208   {
4209   uschar *nah = expand_string(raw_active_hostname);
4210   if (nah == NULL)
4211     {
4212     if (!expand_string_forcedfail)
4213       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4214         "(smtp_active_hostname): %s", raw_active_hostname,
4215         expand_string_message);
4216     }
4217   else if (nah[0] != 0) smtp_active_hostname = nah;
4218   }
4219
4220 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4221 given IP address so that the blocking and relay configuration can be tested. An
4222 RFC 1413 call is made only if we are running in the test harness and an
4223 incoming interface and both ports are specified, because there is no TCP/IP
4224 call to find the ident for. */
4225
4226 if (host_checking)
4227   {
4228   int x[4];
4229   int size;
4230
4231   sender_ident = NULL;
4232   if (running_in_test_harness && sender_host_port != 0 &&
4233       interface_address != NULL && interface_port != 0)
4234     verify_get_ident(1413);
4235
4236   /* In case the given address is a non-canonical IPv6 address, canonicize
4237   it. The code works for both IPv4 and IPv6, as it happens. */
4238
4239   size = host_aton(sender_host_address, x);
4240   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4241   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4242
4243   /* Now set up for testing */
4244
4245   host_build_sender_fullhost();
4246   smtp_input = TRUE;
4247   smtp_in = stdin;
4248   smtp_out = stdout;
4249   sender_local = FALSE;
4250   sender_host_notsocket = TRUE;
4251   debug_file = stderr;
4252   debug_fd = fileno(debug_file);
4253   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4254     "**** but without any ident (RFC 1413) callback.\n"
4255     "**** This is not for real!\n\n",
4256       sender_host_address);
4257
4258   if (verify_check_host(&hosts_connection_nolog) == OK)
4259     log_write_selector &= ~L_smtp_connection;
4260   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4261
4262   if (smtp_start_session())
4263     {
4264     reset_point = store_get(0);
4265     for (;;)
4266       {
4267       store_reset(reset_point);
4268       if (smtp_setup_msg() <= 0) break;
4269       if (!receive_msg(FALSE)) break;
4270       }
4271     }
4272   exim_exit(EXIT_SUCCESS);
4273   }
4274
4275
4276 /* Arrange for message reception if recipients or SMTP were specified;
4277 otherwise complain unless a version print (-bV) happened or this is a filter
4278 verification test. In the former case, show the configuration file name. */
4279
4280 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4281   {
4282   if (version_printed)
4283     {
4284     printf("Configuration file is %s\n", config_main_filename);
4285     return EXIT_SUCCESS;
4286     }
4287   if (filter_test == FTEST_NONE)
4288     {
4289     fprintf(stderr,
4290 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4291 "not directly from a shell command line. Options and/or arguments control\n"
4292 "what it does when called. For a list of options, see the Exim documentation.\n");
4293     return EXIT_FAILURE;
4294     }
4295   }
4296
4297
4298 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4299 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4300 that we are not called from inetd, because that is rejected above. The
4301 following configuration settings are forced here:
4302
4303   (1) Synchronous delivery (-odi)
4304   (2) Errors to stderr (-oep == -oeq)
4305   (3) No parallel remote delivery
4306   (4) Unprivileged delivery
4307
4308 We don't force overall queueing options because there are several of them;
4309 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4310 to override any SMTP queueing. */
4311
4312 if (mua_wrapper)
4313   {
4314   synchronous_delivery = TRUE;
4315   arg_error_handling = ERRORS_STDERR;
4316   remote_max_parallel = 1;
4317   deliver_drop_privilege = TRUE;
4318   queue_smtp = FALSE;
4319   queue_smtp_domains = NULL;
4320   }
4321
4322
4323 /* Prepare to accept one or more new messages on the standard input. When a
4324 message has been read, its id is returned in message_id[]. If doing immediate
4325 delivery, we fork a delivery process for each received message, except for the
4326 last one, where we can save a process switch.
4327
4328 It is only in non-smtp mode that error_handling is allowed to be changed from
4329 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4330 sendmail error modes other than -oem ever actually used? Later: yes.) */
4331
4332 if (!smtp_input) error_handling = arg_error_handling;
4333
4334 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4335 logging being sent down the socket and make an identd call to get the
4336 sender_ident. */
4337
4338 else if (is_inetd)
4339   {
4340   (void)fclose(stderr);
4341   exim_nullstd();                       /* Re-open to /dev/null */
4342   verify_get_ident(IDENT_PORT);
4343   host_build_sender_fullhost();
4344   set_process_info("handling incoming connection from %s via inetd",
4345     sender_fullhost);
4346   }
4347
4348 /* If the sender host address has been set, build sender_fullhost if it hasn't
4349 already been done (which it will have been for inetd). This caters for the
4350 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4351 so that the test for IP options is skipped for -bs input. */
4352
4353 if (sender_host_address != NULL && sender_fullhost == NULL)
4354   {
4355   host_build_sender_fullhost();
4356   set_process_info("handling incoming connection from %s via -oMa",
4357     sender_fullhost);
4358   sender_host_notsocket = TRUE;
4359   }
4360
4361 /* Otherwise, set the sender host as unknown except for inetd calls. This
4362 prevents host checking in the case of -bs not from inetd and also for -bS. */
4363
4364 else if (!is_inetd) sender_host_unknown = TRUE;
4365
4366 /* If stdout does not exist, then dup stdin to stdout. This can happen
4367 if exim is started from inetd. In this case fd 0 will be set to the socket,
4368 but fd 1 will not be set. This also happens for passed SMTP channels. */
4369
4370 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4371
4372 /* Set up the incoming protocol name and the state of the program. Root
4373 is allowed to force received protocol via the -oMr option above, and if we are
4374 in a non-local SMTP state it means we have come via inetd and the process info
4375 has already been set up. We don't set received_protocol here for smtp input,
4376 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4377
4378 if (smtp_input)
4379   {
4380   if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4381     sender_address);
4382   }
4383 else
4384   {
4385   if (received_protocol == NULL)
4386     received_protocol = string_sprintf("local%s", called_as);
4387   set_process_info("accepting a local non-SMTP message from <%s>",
4388     sender_address);
4389   }
4390
4391 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4392 set) */
4393
4394 queue_check_only();
4395 local_queue_only = queue_only;
4396
4397 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4398 the spool if so configured. On failure, we must not attempt to send an error
4399 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4400 error code is given.) */
4401
4402 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4403   {
4404   fprintf(stderr, "exim: insufficient disk space\n");
4405   return EXIT_FAILURE;
4406   }
4407
4408 /* If this is smtp input of any kind, handle the start of the SMTP
4409 session. */
4410
4411 if (smtp_input)
4412   {
4413   smtp_in = stdin;
4414   smtp_out = stdout;
4415   if (verify_check_host(&hosts_connection_nolog) == OK)
4416     log_write_selector &= ~L_smtp_connection;
4417   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4418   if (!smtp_start_session())
4419     {
4420     mac_smtp_fflush();
4421     exim_exit(EXIT_SUCCESS);
4422     }
4423   }
4424
4425 /* Otherwise, set up the input size limit here. */
4426
4427 else
4428   {
4429   thismessage_size_limit = expand_string_integer(message_size_limit);
4430   if (thismessage_size_limit < 0)
4431     {
4432     if (thismessage_size_limit == -1)
4433       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4434         "message_size_limit: %s", expand_string_message);
4435     else
4436       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4437         "message_size_limit: %s", expand_string_message);
4438     }
4439   }
4440
4441 /* Loop for several messages when reading SMTP input. If we fork any child
4442 processes, we don't want to wait for them unless synchronous delivery is
4443 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4444 same as SIG_DFL, despite the fact that documentation often lists the default as
4445 "ignore". This is a confusing area. This is what I know:
4446
4447 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4448 processes that complete simply to go away without ever becoming defunct. You
4449 can't then wait for them - but we don't want to wait for them in the
4450 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4451 happen for all OS (e.g. *BSD is different).
4452
4453 But that's not the end of the story. Some (many? all?) systems have the
4454 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4455 has by default, so it seems that the difference is merely one of default
4456 (compare restarting vs non-restarting signals).
4457
4458 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4459 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4460 of the loop below. Paranoia rules.
4461
4462 February 2003: That's *still* not the end of the story. There are now versions
4463 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4464 process then calls waitpid(), a grumble is written to the system log, because
4465 this is logically inconsistent. In other words, it doesn't like the paranoia.
4466 As a consequenc of this, the waitpid() below is now excluded if we are sure
4467 that SIG_IGN works. */
4468
4469 if (!synchronous_delivery)
4470   {
4471   #ifdef SA_NOCLDWAIT
4472   struct sigaction act;
4473   act.sa_handler = SIG_IGN;
4474   sigemptyset(&(act.sa_mask));
4475   act.sa_flags = SA_NOCLDWAIT;
4476   sigaction(SIGCHLD, &act, NULL);
4477   #else
4478   signal(SIGCHLD, SIG_IGN);
4479   #endif
4480   }
4481
4482 /* Save the current store pool point, for resetting at the start of
4483 each message, and save the real sender address, if any. */
4484
4485 reset_point = store_get(0);
4486 real_sender_address = sender_address;
4487
4488 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4489 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4490 collapsed). */
4491
4492 while (more)
4493   {
4494   store_reset(reset_point);
4495   message_id[0] = 0;
4496
4497   /* In the SMTP case, we have to handle the initial SMTP input and build the
4498   recipients list, before calling receive_msg() to read the message proper.
4499   Whatever sender address is actually given in the SMTP transaction is
4500   actually ignored for local senders - we use the actual sender, which is
4501   normally either the underlying user running this process or a -f argument
4502   provided by a trusted caller. It is saved in real_sender_address.
4503
4504   However, if this value is NULL, we are dealing with a trusted caller when
4505   -f was not used; in this case, the SMTP sender is allowed to stand.
4506
4507   Also, if untrusted_set_sender is set, we permit sender addresses that match
4508   anything in its list.
4509
4510   The variable raw_sender_address holds the sender address before rewriting. */
4511
4512   if (smtp_input)
4513     {
4514     int rc;
4515     if ((rc = smtp_setup_msg()) > 0)
4516       {
4517       if (real_sender_address != NULL &&
4518           !receive_check_set_sender(sender_address))
4519         {
4520         sender_address = raw_sender = real_sender_address;
4521         sender_address_unrewritten = NULL;
4522         }
4523       more = receive_msg(extract_recipients);
4524       if (message_id[0] == 0)
4525         {
4526         if (more) continue;
4527         exim_exit(EXIT_FAILURE);
4528         }
4529       }
4530     else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4531     }
4532
4533   /* In the non-SMTP case, we have all the information from the command
4534   line, but must process it in case it is in the more general RFC822
4535   format, and in any case, to detect syntax errors. Also, it appears that
4536   the use of comma-separated lists as single arguments is common, so we
4537   had better support them. */
4538
4539   else
4540     {
4541     int i;
4542     int rcount = 0;
4543     int count = argc - recipients_arg;
4544     uschar **list = argv + recipients_arg;
4545
4546     /* These options cannot be changed dynamically for non-SMTP messages */
4547
4548     active_local_sender_retain = local_sender_retain;
4549     active_local_from_check = local_from_check;
4550
4551     /* Save before any rewriting */
4552
4553     raw_sender = string_copy(sender_address);
4554
4555     /* Loop for each argument */
4556
4557     for (i = 0; i < count; i++)
4558       {
4559       int start, end, domain;
4560       uschar *errmess;
4561       uschar *s = list[i];
4562
4563       /* Loop for each comma-separated address */
4564
4565       while (*s != 0)
4566         {
4567         BOOL finished = FALSE;
4568         uschar *recipient;
4569         uschar *ss = parse_find_address_end(s, FALSE);
4570
4571         if (*ss == ',') *ss = 0; else finished = TRUE;
4572
4573         /* Check max recipients - if -t was used, these aren't recipients */
4574
4575         if (recipients_max > 0 && ++rcount > recipients_max &&
4576             !extract_recipients)
4577           {
4578           if (error_handling == ERRORS_STDERR)
4579             {
4580             fprintf(stderr, "exim: too many recipients\n");
4581             exim_exit(EXIT_FAILURE);
4582             }
4583           else
4584             {
4585             return
4586               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4587                 errors_sender_rc : EXIT_FAILURE;
4588             }
4589           }
4590
4591         recipient =
4592           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4593
4594         if (domain == 0 && !allow_unqualified_recipient)
4595           {
4596           recipient = NULL;
4597           errmess = US"unqualified recipient address not allowed";
4598           }
4599
4600         if (recipient == NULL)
4601           {
4602           if (error_handling == ERRORS_STDERR)
4603             {
4604             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4605               string_printing(list[i]), errmess);
4606             exim_exit(EXIT_FAILURE);
4607             }
4608           else
4609             {
4610             error_block eblock;
4611             eblock.next = NULL;
4612             eblock.text1 = string_printing(list[i]);
4613             eblock.text2 = errmess;
4614             return
4615               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4616                 errors_sender_rc : EXIT_FAILURE;
4617             }
4618           }
4619
4620         receive_add_recipient(recipient, -1);
4621         s = ss;
4622         if (!finished)
4623           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4624         }
4625       }
4626
4627     /* Show the recipients when debugging */
4628
4629     DEBUG(D_receive)
4630       {
4631       int i;
4632       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4633       if (recipients_list != NULL)
4634         {
4635         debug_printf("Recipients:\n");
4636         for (i = 0; i < recipients_count; i++)
4637           debug_printf("  %s\n", recipients_list[i].address);
4638         }
4639       }
4640
4641     /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4642     ignored; rejecting here would just add complication, and it can just as
4643     well be done later. Allow $recipients to be visible in the ACL. */
4644
4645     if (acl_not_smtp_start != NULL)
4646       {
4647       uschar *user_msg, *log_msg;
4648       enable_dollar_recipients = TRUE;
4649       (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4650         &user_msg, &log_msg);
4651       enable_dollar_recipients = FALSE;
4652       }
4653
4654     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4655     will just read the headers for the message, and not write anything onto the
4656     spool. */
4657
4658     message_ended = END_NOTENDED;
4659     more = receive_msg(extract_recipients);
4660
4661     /* more is always FALSE here (not SMTP message) when reading a message
4662     for real; when reading the headers of a message for filter testing,
4663     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4664
4665     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4666     }  /* Non-SMTP message reception */
4667
4668   /* If this is a filter testing run, there are headers in store, but
4669   no message on the spool. Run the filtering code in testing mode, setting
4670   the domain to the qualify domain and the local part to the current user,
4671   unless they have been set by options. The prefix and suffix are left unset
4672   unless specified. The the return path is set to to the sender unless it has
4673   already been set from a return-path header in the message. */
4674
4675   if (filter_test != FTEST_NONE)
4676     {
4677     deliver_domain = (ftest_domain != NULL)?
4678       ftest_domain : qualify_domain_recipient;
4679     deliver_domain_orig = deliver_domain;
4680     deliver_localpart = (ftest_localpart != NULL)?
4681       ftest_localpart : originator_login;
4682     deliver_localpart_orig = deliver_localpart;
4683     deliver_localpart_prefix = ftest_prefix;
4684     deliver_localpart_suffix = ftest_suffix;
4685     deliver_home = originator_home;
4686
4687     if (return_path == NULL)
4688       {
4689       printf("Return-path copied from sender\n");
4690       return_path = string_copy(sender_address);
4691       }
4692     else
4693       {
4694       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4695       }
4696     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4697
4698     receive_add_recipient(
4699       string_sprintf("%s%s%s@%s",
4700         (ftest_prefix == NULL)? US"" : ftest_prefix,
4701         deliver_localpart,
4702         (ftest_suffix == NULL)? US"" : ftest_suffix,
4703         deliver_domain), -1);
4704
4705     printf("Recipient   = %s\n", recipients_list[0].address);
4706     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4707     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4708
4709     (void)chdir("/");   /* Get away from wherever the user is running this from */
4710
4711     /* Now we run either a system filter test, or a user filter test, or both.
4712     In the latter case, headers added by the system filter will persist and be
4713     available to the user filter. We need to copy the filter variables
4714     explicitly. */
4715
4716     if ((filter_test & FTEST_SYSTEM) != 0)
4717       {
4718       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4719         exim_exit(EXIT_FAILURE);
4720       }
4721
4722     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4723
4724     if ((filter_test & FTEST_USER) != 0)
4725       {
4726       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4727         exim_exit(EXIT_FAILURE);
4728       }
4729
4730     exim_exit(EXIT_SUCCESS);
4731     }
4732
4733   /* Else act on the result of message reception. We should not get here unless
4734   message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4735   TRUE. If it is not, check on the number of messages received in this
4736   connection. If that's OK and queue_only_load is set, check that the load
4737   average is below it. If it is not, set local_queue_only TRUE. Note that it
4738   then remains this way for any subsequent messages on the same SMTP connection.
4739   This is a deliberate choice; even though the load average may fall, it
4740   doesn't seem right to deliver later messages on the same call when not
4741   delivering earlier ones. */
4742
4743   if (!local_queue_only)
4744     {
4745     if (smtp_accept_queue_per_connection > 0 &&
4746         receive_messagecount > smtp_accept_queue_per_connection)
4747       {
4748       local_queue_only = TRUE;
4749       queue_only_reason = 2;
4750       }
4751     else if (queue_only_load >= 0)
4752       {
4753       local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4754       if (local_queue_only) queue_only_reason = 3;
4755       }
4756     }
4757
4758   /* If running as an MUA wrapper, all queueing options and freezing options
4759   are ignored. */
4760
4761   if (mua_wrapper)
4762     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4763
4764   /* Log the queueing here, when it will get a message id attached, but
4765   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4766   connections). */
4767
4768   if (local_queue_only) switch(queue_only_reason)
4769     {
4770     case 2:
4771     log_write(L_delay_delivery,
4772               LOG_MAIN, "no immediate delivery: more than %d messages "
4773       "received in one connection", smtp_accept_queue_per_connection);
4774     break;
4775
4776     case 3:
4777     log_write(L_delay_delivery,
4778               LOG_MAIN, "no immediate delivery: load average %.2f",
4779               (double)load_average/1000.0);
4780     break;
4781     }
4782
4783   /* Else do the delivery unless the ACL or local_scan() called for queue only
4784   or froze the message. Always deliver in a separate process. A fork failure is
4785   not a disaster, as the delivery will eventually happen on a subsequent queue
4786   run. The search cache must be tidied before the fork, as the parent will
4787   do it before exiting. The child will trigger a lookup failure and
4788   thereby defer the delivery if it tries to use (for example) a cached ldap
4789   connection that the parent has called unbind on. */
4790
4791   else if (!queue_only_policy && !deliver_freeze)
4792     {
4793     pid_t pid;
4794     search_tidyup();
4795
4796     if ((pid = fork()) == 0)
4797       {
4798       int rc;
4799       close_unwanted();      /* Close unwanted file descriptors and TLS */
4800       exim_nullstd();        /* Ensure std{in,out,err} exist */
4801
4802       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4803       mode, deliver_drop_privilege is forced TRUE). */
4804
4805       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4806         {
4807         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4808           message_id);
4809         /* Control does not return here. */
4810         }
4811
4812       /* No need to re-exec */
4813
4814       rc = deliver_message(message_id, FALSE, FALSE);
4815       search_tidyup();
4816       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4817         EXIT_SUCCESS : EXIT_FAILURE);
4818       }
4819
4820     if (pid < 0)
4821       {
4822       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4823         "process: %s", strerror(errno));
4824       }
4825
4826     /* In the parent, wait if synchronous delivery is required. This will
4827     always be the case in MUA wrapper mode. */
4828
4829     else if (synchronous_delivery)
4830       {
4831       int status;
4832       while (wait(&status) != pid);
4833       if ((status & 0x00ff) != 0)
4834         log_write(0, LOG_MAIN|LOG_PANIC,
4835           "process %d crashed with signal %d while delivering %s",
4836           (int)pid, status & 0x00ff, message_id);
4837       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4838       }
4839     }
4840
4841   /* The loop will repeat if more is TRUE. If we do not know know that the OS
4842   automatically reaps children (see comments above the loop), clear away any
4843   finished subprocesses here, in case there are lots of messages coming in
4844   from the same source. */
4845
4846   #ifndef SIG_IGN_WORKS
4847   while (waitpid(-1, NULL, WNOHANG) > 0);
4848   #endif
4849   }
4850
4851 exim_exit(EXIT_SUCCESS);   /* Never returns */
4852 return 0;                  /* To stop compiler warning */
4853 }
4854
4855 /* End of exim.c */