src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.17 2005/03/22 14:11:54 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2005 */
   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 *   Ensure stdin, stdout, and stderr exist       *
 380 *************************************************/
 381
 382 /* Some operating systems grumble if an exec() happens without a standard
 383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 384 file will be opened and will use these fd values, and then some other bit of
 385 code will assume, for example, that it can write error messages to stderr.
 386 This function ensures that fds 0, 1, and 2 are open if they do not already
 387 exist, by connecting them to /dev/null.
 388
 389 This function is also used to ensure that std{in,out,err} exist at all times,
 390 so that if any library that Exim calls tries to use them, it doesn't crash.
 391
 392 Arguments:  None
 393 Returns:    Nothing
 394 */
 395
 396 void
 397 exim_nullstd(void)
 398 {
 399 int i;
 400 int devnull = -1;
 401 struct stat statbuf;
 402 for (i = 0; i <= 2; i++)
 403   {
 404   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 405     {
 406     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 407     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 408       string_open_failed(errno, "/dev/null"));
 409     if (devnull != i) dup2(devnull, i);
 410     }
 411   }
 412 if (devnull > 2) close(devnull);
 413 }
 414
 415
 416
 417
 418 /*************************************************
 419 *   Close unwanted file descriptors for delivery *
 420 *************************************************/
 421
 422 /* This function is called from a new process that has been forked to deliver
 423 an incoming message, either directly, or using exec.
 424
 425 We want any smtp input streams to be closed in this new process. However, it
 426 has been observed that using fclose() here causes trouble. When reading in -bS
 427 input, duplicate copies of messages have been seen. The files will be sharing a
 428 file pointer with the parent process, and it seems that fclose() (at least on
 429 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
 430 least sometimes. Hence we go for closing the underlying file descriptors.
 431
 432 If TLS is active, we want to shut down the TLS library, but without molesting
 433 the parent's SSL connection.
 434
 435 For delivery of a non-SMTP message, we want to close stdin and stdout (and
 436 stderr unless debugging) because the calling process might have set them up as
 437 pipes and be waiting for them to close before it waits for the submission
 438 process to terminate. If they aren't closed, they hold up the calling process
 439 until the initial delivery process finishes, which is not what we want.
 440
 441 Exception: We do want it for synchronous delivery!
 442
 443 And notwithstanding all the above, if D_resolver is set, implying resolver
 444 debugging, leave stdout open, because that's where the resolver writes its
 445 debugging output.
 446
 447 When we close stderr (which implies we've also closed stdout), we also get rid
 448 of any controlling terminal.
 449
 450 Arguments:   None
 451 Returns:     Nothing
 452 */
 453
 454 static void
 455 close_unwanted(void)
 456 {
 457 if (smtp_input)
 458   {
 459   #ifdef SUPPORT_TLS
 460   tls_close(FALSE);      /* Shut down the TLS library */
 461   #endif
 462   close(fileno(smtp_in));
 463   close(fileno(smtp_out));
 464   smtp_in = NULL;
 465   }
 466 else
 467   {
 468   close(0);                                           /* stdin */
 469   if ((debug_selector & D_resolver) == 0)  close(1);  /* stdout */
 470   if (debug_selector == 0)                            /* stderr */
 471     {
 472     if (!synchronous_delivery)
 473       {
 474       close(2);
 475       log_stderr = NULL;
 476       }
 477     (void)setsid();
 478     }
 479   }
 480 }
 481
 482
 483
 484
 485 /*************************************************
 486 *          Set uid and gid                       *
 487 *************************************************/
 488
 489 /* This function sets a new uid and gid permanently, optionally calling
 490 initgroups() to set auxiliary groups. There are some special cases when running
 491 Exim in unprivileged modes. In these situations the effective uid will not be
 492 root; if we already have the right effective uid/gid, and don't need to
 493 initialize any groups, leave things as they are.
 494
 495 Arguments:
 496   uid        the uid
 497   gid        the gid
 498   igflag     TRUE if initgroups() wanted
 499   msg        text to use in debugging output and failure log
 500
 501 Returns:     nothing; bombs out on failure
 502 */
 503
 504 void
 505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
 506 {
 507 uid_t euid = geteuid();
 508 gid_t egid = getegid();
 509
 510 if (euid == root_uid || euid != uid || egid != gid || igflag)
 511   {
 512   /* At least one OS returns +1 for initgroups failure, so just check for
 513   non-zero. */
 514
 515   if (igflag)
 516     {
 517     struct passwd *pw = getpwuid(uid);
 518     if (pw != NULL)
 519       {
 520       if (initgroups(pw->pw_name, gid) != 0)
 521         log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
 522           (long int)uid, strerror(errno));
 523       }
 524     else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
 525       "no passwd entry for uid=%ld", (long int)uid);
 526     }
 527
 528   if (setgid(gid) < 0 || setuid(uid) < 0)
 529     {
 530     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
 531       "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
 532     }
 533   }
 534
 535 /* Debugging output included uid/gid and all groups */
 536
 537 DEBUG(D_uid)
 538   {
 539   int group_count;
 540   gid_t group_list[NGROUPS_MAX];
 541   debug_printf("changed uid/gid: %s\n  uid=%ld gid=%ld pid=%ld\n", msg,
 542     (long int)geteuid(), (long int)getegid(), (long int)getpid());
 543   group_count = getgroups(NGROUPS_MAX, group_list);
 544   debug_printf("  auxiliary group list:");
 545   if (group_count > 0)
 546     {
 547     int i;
 548     for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
 549     }
 550   else debug_printf(" <none>");
 551   debug_printf("\n");
 552   }
 553 }
 554
 555
 556
 557
 558 /*************************************************
 559 *               Exit point                       *
 560 *************************************************/
 561
 562 /* Exim exits via this function so that it always clears up any open
 563 databases.
 564
 565 Arguments:
 566   rc         return code
 567
 568 Returns:     does not return
 569 */
 570
 571 void
 572 exim_exit(int rc)
 573 {
 574 search_tidyup();
 575 DEBUG(D_any)
 576   debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
 577     ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
 578 exit(rc);
 579 }
 580
 581
 582
 583
 584 /*************************************************
 585 *         Extract port from host address         *
 586 *************************************************/
 587
 588 /* Called to extract the port from the values given to -oMa and -oMi.
 589 It also checks the syntax of the address.
 590
 591 Argument:
 592   address   the address, with possible port on the end
 593
 594 Returns:    the port, or zero if there isn't one
 595             bombs out on a syntax error
 596 */
 597
 598 static int
 599 check_port(uschar *address)
 600 {
 601 int port = host_extract_port(address);
 602 if (string_is_ip_address(address, NULL) == 0)
 603   {
 604   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 605   exit(EXIT_FAILURE);
 606   }
 607 return port;
 608 }
 609
 610
 611
 612 /*************************************************
 613 *              Test/verify an address            *
 614 *************************************************/
 615
 616 /* This function is called by the -bv and -bt code. It extracts a working
 617 address from a full RFC 822 address. This isn't really necessary per se, but it
 618 has the effect of collapsing source routes.
 619
 620 Arguments:
 621   s            the address string
 622   flags        flag bits for verify_address()
 623   exit_value   to be set for failures
 624
 625 Returns:       nothing
 626 */
 627
 628 static void
 629 test_address(uschar *s, int flags, int *exit_value)
 630 {
 631 int start, end, domain;
 632 uschar *parse_error = NULL;
 633 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 634   FALSE);
 635 if (address == NULL)
 636   {
 637   fprintf(stdout, "syntax error: %s\n", parse_error);
 638   *exit_value = 2;
 639   }
 640 else
 641   {
 642   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 643     -1, -1, NULL, NULL, NULL);
 644   if (rc == FAIL) *exit_value = 2;
 645     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 646   }
 647 }
 648
 649
 650
 651 /*************************************************
 652 *         Decode bit settings for log/debug      *
 653 *************************************************/
 654
 655 /* This function decodes a string containing bit settings in the form of +name
 656 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
 657 also recognizes a numeric setting of the form =<number>, but this is not
 658 intended for user use. It's an easy way for Exim to pass the debug settings
 659 when it is re-exec'ed.
 660
 661 The log options are held in two unsigned ints (because there became too many
 662 for one). The top bit in the table means "put in 2nd selector". This does not
 663 yet apply to debug options, so the "=" facility sets only the first selector.
 664
 665 A bad value for a debug setting is treated as an unknown option - error message
 666 to stderr and die. For log settings, which come from the configuration file,
 667 we write to the log on the way out...
 668
 669 Arguments:
 670   selector1      address of the first bit string
 671   selector2      address of the second bit string, or NULL
 672   string         the configured string
 673   options        the table of option names
 674   count          size of table
 675   which          "log" or "debug"
 676
 677 Returns:         nothing on success - bomb out on failure
 678 */
 679
 680 static void
 681 decode_bits(unsigned int *selector1, unsigned int *selector2, uschar *string,
 682   bit_table *options, int count, uschar *which)
 683 {
 684 uschar *errmsg;
 685 if (string == NULL) return;
 686
 687 if (*string == '=')
 688   {
 689   char *end;    /* Not uschar */
 690   *selector1 = strtoul(CS string+1, &end, 0);
 691   if (*end == 0) return;
 692   errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
 693     string);
 694   goto ERROR_RETURN;
 695   }
 696
 697 /* Handle symbolic setting */
 698
 699 else for(;;)
 700   {
 701   BOOL adding;
 702   uschar *s;
 703   int len;
 704   bit_table *start, *end;
 705
 706   while (isspace(*string)) string++;
 707   if (*string == 0) return;
 708
 709   if (*string != '+' && *string != '-')
 710     {
 711     errmsg = string_sprintf("malformed %s_selector setting: "
 712       "+ or - expected but found \"%s\"", which, string);
 713     goto ERROR_RETURN;
 714     }
 715
 716   adding = *string++ == '+';
 717   s = string;
 718   while (isalnum(*string) || *string == '_') string++;
 719   len = string - s;
 720
 721   start = options;
 722   end = options + count;
 723
 724   while (start < end)
 725     {
 726     bit_table *middle = start + (end - start)/2;
 727     int c = Ustrncmp(s, middle->name, len);
 728     if (c == 0)
 729       {
 730       if (middle->name[len] != 0) c = -1; else
 731         {
 732         unsigned int bit = middle->bit;
 733         unsigned int *selector;
 734
 735         /* The value with all bits set means "set all bits in both selectors"
 736         in the case where two are being handled. However, the top bit in the
 737         second selector is never set. */
 738
 739         if (bit == 0xffffffff)
 740           {
 741           *selector1 = adding? bit : 0;
 742           if (selector2 != NULL) *selector2 = adding? 0x7fffffff : 0;
 743           }
 744
 745         /* Otherwise, the 0x80000000 bit means "this value, without the top
 746         bit, belongs in the second selector". */
 747
 748         else
 749           {
 750           if ((bit & 0x80000000) != 0)
 751             {
 752             selector = selector2;
 753             bit &= 0x7fffffff;
 754             }
 755           else selector = selector1;
 756           if (adding) *selector |= bit; else *selector &= ~bit;
 757           }
 758         break;  /* Out of loop to match selector name */
 759         }
 760       }
 761     if (c < 0) end = middle; else start = middle + 1;
 762     }  /* Loop to match selector name */
 763
 764   if (start >= end)
 765     {
 766     errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
 767       adding? '+' : '-', len, s);
 768     goto ERROR_RETURN;
 769     }
 770   }    /* Loop for selector names */
 771
 772 /* Handle disasters */
 773
 774 ERROR_RETURN:
 775 if (Ustrcmp(which, "debug") == 0)
 776   {
 777   fprintf(stderr, "exim: %s\n", errmsg);
 778   exit(EXIT_FAILURE);
 779   }
 780 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
 781 }
 782
 783
 784
 785 /*************************************************
 786 *          Show supported features               *
 787 *************************************************/
 788
 789 /* This function is called for -bV and for -d to output the optional features
 790 of the current Exim binary.
 791
 792 Arguments:  a FILE for printing
 793 Returns:    nothing
 794 */
 795
 796 static void
 797 show_whats_supported(FILE *f)
 798 {
 799 #ifdef DB_VERSION_STRING
 800 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 801 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 802   #ifdef USE_DB
 803   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 804   #else
 805   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 806   #endif
 807 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 808 fprintf(f, "Probably ndbm\n");
 809 #elif defined(USE_TDB)
 810 fprintf(f, "Using tdb\n");
 811 #else
 812   #ifdef USE_GDBM
 813   fprintf(f, "Probably GDBM (native mode)\n");
 814   #else
 815   fprintf(f, "Probably GDBM (compatibility mode)\n");
 816   #endif
 817 #endif
 818
 819 fprintf(f, "Support for:");
 820 #if HAVE_ICONV
 821   fprintf(f, " iconv()");
 822 #endif
 823 #if HAVE_IPV6
 824   fprintf(f, " IPv6");
 825 #endif
 826 #ifdef SUPPORT_PAM
 827   fprintf(f, " PAM");
 828 #endif
 829 #ifdef EXIM_PERL
 830   fprintf(f, " Perl");
 831 #endif
 832 #ifdef EXPAND_DLFUNC
 833   fprintf(f, " Expand_dlfunc");
 834 #endif
 835 #ifdef USE_TCP_WRAPPERS
 836   fprintf(f, " TCPwrappers");
 837 #endif
 838 #ifdef SUPPORT_TLS
 839   #ifdef USE_GNUTLS
 840   fprintf(f, " GnuTLS");
 841   #else
 842   fprintf(f, " OpenSSL");
 843   #endif
 844 #endif
 845 #ifdef WITH_CONTENT_SCAN
 846   fprintf(f, " Content_Scanning");
 847 #endif
 848 #ifdef WITH_OLD_DEMIME
 849   fprintf(f, " Old_Demime");
 850 #endif
 851 #ifdef EXPERIMENTAL_SPF
 852   fprintf(f, " Experimental_SPF");
 853 #endif
 854 #ifdef EXPERIMENTAL_SRS
 855   fprintf(f, " Experimental_SRS");
 856 #endif
 857 #ifdef EXPERIMENTAL_BRIGHTMAIL
 858   fprintf(f, " Experimental_Brightmail");
 859 #endif
 860 #ifdef EXPERIMENTAL_DOMAINKEYS
 861   fprintf(f, " Experimental_DomainKeys");
 862 #endif
 863 fprintf(f, "\n");
 864
 865 fprintf(f, "Lookups:");
 866 #ifdef LOOKUP_LSEARCH
 867   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 868 #endif
 869 #ifdef LOOKUP_CDB
 870   fprintf(f, " cdb");
 871 #endif
 872 #ifdef LOOKUP_DBM
 873   fprintf(f, " dbm dbmnz");
 874 #endif
 875 #ifdef LOOKUP_DNSDB
 876   fprintf(f, " dnsdb");
 877 #endif
 878 #ifdef LOOKUP_DSEARCH
 879   fprintf(f, " dsearch");
 880 #endif
 881 #ifdef LOOKUP_IBASE
 882   fprintf(f, " ibase");
 883 #endif
 884 #ifdef LOOKUP_LDAP
 885   fprintf(f, " ldap ldapdn ldapm");
 886 #endif
 887 #ifdef LOOKUP_MYSQL
 888   fprintf(f, " mysql");
 889 #endif
 890 #ifdef LOOKUP_NIS
 891   fprintf(f, " nis nis0");
 892 #endif
 893 #ifdef LOOKUP_NISPLUS
 894   fprintf(f, " nisplus");
 895 #endif
 896 #ifdef LOOKUP_ORACLE
 897   fprintf(f, " oracle");
 898 #endif
 899 #ifdef LOOKUP_PASSWD
 900   fprintf(f, " passwd");
 901 #endif
 902 #ifdef LOOKUP_PGSQL
 903   fprintf(f, " pgsql");
 904 #endif
 905 #ifdef LOOKUP_TESTDB
 906   fprintf(f, " testdb");
 907 #endif
 908 #ifdef LOOKUP_WHOSON
 909   fprintf(f, " whoson");
 910 #endif
 911 fprintf(f, "\n");
 912
 913 fprintf(f, "Authenticators:");
 914 #ifdef AUTH_CRAM_MD5
 915   fprintf(f, " cram_md5");
 916 #endif
 917 #ifdef AUTH_CYRUS_SASL
 918   fprintf(f, " cyrus_sasl");
 919 #endif
 920 #ifdef AUTH_PLAINTEXT
 921   fprintf(f, " plaintext");
 922 #endif
 923 #ifdef AUTH_SPA
 924   fprintf(f, " spa");
 925 #endif
 926 fprintf(f, "\n");
 927
 928 fprintf(f, "Routers:");
 929 #ifdef ROUTER_ACCEPT
 930   fprintf(f, " accept");
 931 #endif
 932 #ifdef ROUTER_DNSLOOKUP
 933   fprintf(f, " dnslookup");
 934 #endif
 935 #ifdef ROUTER_IPLITERAL
 936   fprintf(f, " ipliteral");
 937 #endif
 938 #ifdef ROUTER_IPLOOKUP
 939   fprintf(f, " iplookup");
 940 #endif
 941 #ifdef ROUTER_MANUALROUTE
 942   fprintf(f, " manualroute");
 943 #endif
 944 #ifdef ROUTER_QUERYPROGRAM
 945   fprintf(f, " queryprogram");
 946 #endif
 947 #ifdef ROUTER_REDIRECT
 948   fprintf(f, " redirect");
 949 #endif
 950 fprintf(f, "\n");
 951
 952 fprintf(f, "Transports:");
 953 #ifdef TRANSPORT_APPENDFILE
 954   fprintf(f, " appendfile");
 955   #ifdef SUPPORT_MAILDIR
 956     fprintf(f, "/maildir");
 957   #endif
 958   #ifdef SUPPORT_MAILSTORE
 959     fprintf(f, "/mailstore");
 960   #endif
 961   #ifdef SUPPORT_MBX
 962     fprintf(f, "/mbx");
 963   #endif
 964 #endif
 965 #ifdef TRANSPORT_AUTOREPLY
 966   fprintf(f, " autoreply");
 967 #endif
 968 #ifdef TRANSPORT_LMTP
 969   fprintf(f, " lmtp");
 970 #endif
 971 #ifdef TRANSPORT_PIPE
 972   fprintf(f, " pipe");
 973 #endif
 974 #ifdef TRANSPORT_SMTP
 975   fprintf(f, " smtp");
 976 #endif
 977 fprintf(f, "\n");
 978
 979 if (fixed_never_users[0] > 0)
 980   {
 981   int i;
 982   fprintf(f, "Fixed never_users: ");
 983   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
 984     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
 985   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
 986   }
 987 }
 988
 989
 990
 991
 992 /*************************************************
 993 *               Quote a local part               *
 994 *************************************************/
 995
 996 /* This function is used when a sender address or a From: or Sender: header
 997 line is being created from the caller's login, or from an authenticated_id. It
 998 applies appropriate quoting rules for a local part.
 999
1000 Argument:    the local part
1001 Returns:     the local part, quoted if necessary
1002 */
1003
1004 uschar *
1005 local_part_quote(uschar *lpart)
1006 {
1007 BOOL needs_quote = FALSE;
1008 int size, ptr;
1009 uschar *yield;
1010 uschar *t;
1011
1012 for (t = lpart; !needs_quote && *t != 0; t++)
1013   {
1014   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1015     (*t != '.' || t == lpart || t[1] == 0);
1016   }
1017
1018 if (!needs_quote) return lpart;
1019
1020 size = ptr = 0;
1021 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1022
1023 for (;;)
1024   {
1025   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1026   if (nq == NULL)
1027     {
1028     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1029     break;
1030     }
1031   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1032   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1033   yield = string_cat(yield, &size, &ptr, nq, 1);
1034   lpart = nq + 1;
1035   }
1036
1037 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1038 yield[ptr] = 0;
1039 return yield;
1040 }
1041
1042
1043
1044 #ifdef USE_READLINE
1045 /*************************************************
1046 *         Load readline() functions              *
1047 *************************************************/
1048
1049 /* This function is called from testing executions that read data from stdin,
1050 but only when running as the calling user. Currently, only -be does this. The
1051 function loads the readline() function library and passes back the functions.
1052 On some systems, it needs the curses library, so load that too, but try without
1053 it if loading fails. All this functionality has to be requested at build time.
1054
1055 Arguments:
1056   fn_readline_ptr   pointer to where to put the readline pointer
1057   fn_addhist_ptr    pointer to where to put the addhistory function
1058
1059 Returns:            the dlopen handle or NULL on failure
1060 */
1061
1062 static void *
1063 set_readline(char * (**fn_readline_ptr)(char *),
1064              char * (**fn_addhist_ptr)(char *))
1065 {
1066 void *dlhandle;
1067 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1068
1069 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1070 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1071
1072 if (dlhandle != NULL)
1073   {
1074   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1075   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1076   }
1077 else
1078   {
1079   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1080   }
1081
1082 return dlhandle;
1083 }
1084 #endif
1085
1086
1087
1088 /*************************************************
1089 *    Get a line from stdin for testing things    *
1090 *************************************************/
1091
1092 /* This function is called when running tests that can take a number of lines
1093 of input (for example, -be and -bt). It handles continuations and trailing
1094 spaces. And prompting and a blank line output on eof. If readline() is in use,
1095 the arguments are non-NULL and provide the relevant functions.
1096
1097 Arguments:
1098   fn_readline   readline function or NULL
1099   fn_addhist    addhist function or NULL
1100
1101 Returns:        pointer to dynamic memory, or NULL at end of file
1102 */
1103
1104 static uschar *
1105 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1106 {
1107 int i;
1108 int size = 0;
1109 int ptr = 0;
1110 uschar *yield = NULL;
1111
1112 if (fn_readline == NULL) printf("> ");
1113
1114 for (i = 0;; i++)
1115   {
1116   uschar buffer[1024];
1117   uschar *p, *ss;
1118
1119   #ifdef USE_READLINE
1120   char *readline_line = NULL;
1121   if (fn_readline != NULL)
1122     {
1123     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1124     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1125     p = US readline_line;
1126     }
1127   else
1128   #endif
1129
1130   /* readline() not in use */
1131
1132     {
1133     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1134     p = buffer;
1135     }
1136
1137   /* Handle the line */
1138
1139   ss = p + (int)Ustrlen(p);
1140   while (ss > p && isspace(ss[-1])) ss--;
1141
1142   if (i > 0)
1143     {
1144     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1145     }
1146
1147   yield = string_cat(yield, &size, &ptr, p, ss - p);
1148
1149   #ifdef USE_READLINE
1150   if (fn_readline != NULL) free(readline_line);
1151   #endif
1152
1153   if (ss == p || yield[ptr-1] != '\\')
1154     {
1155     yield[ptr] = 0;
1156     break;
1157     }
1158   yield[--ptr] = 0;
1159   }
1160
1161 if (yield == NULL) printf("\n");
1162 return yield;
1163 }
1164
1165
1166
1167 /*************************************************
1168 *          Entry point and high-level code       *
1169 *************************************************/
1170
1171 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1172 the appropriate action. All the necessary functions are present in the one
1173 binary. I originally thought one should split it up, but it turns out that so
1174 much of the apparatus is needed in each chunk that one might as well just have
1175 it all available all the time, which then makes the coding easier as well.
1176
1177 Arguments:
1178   argc      count of entries in argv
1179   argv      argument strings, with argv[0] being the program name
1180
1181 Returns:    EXIT_SUCCESS if terminated successfully
1182             EXIT_FAILURE otherwise, except when a message has been sent
1183               to the sender, and -oee was given
1184 */
1185
1186 int
1187 main(int argc, char **cargv)
1188 {
1189 uschar **argv = USS cargv;
1190 int  arg_receive_timeout = -1;
1191 int  arg_smtp_receive_timeout = -1;
1192 int  arg_error_handling = error_handling;
1193 int  filter_sfd = -1;
1194 int  filter_ufd = -1;
1195 int  group_count;
1196 int  i;
1197 int  list_queue_option = 0;
1198 int  msg_action = 0;
1199 int  msg_action_arg = -1;
1200 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1201 int  queue_only_reason = 0;
1202 #ifdef EXIM_PERL
1203 int  perl_start_option = 0;
1204 #endif
1205 int  recipients_arg = argc;
1206 int  sender_address_domain = 0;
1207 int  test_retry_arg = -1;
1208 int  test_rewrite_arg = -1;
1209 BOOL arg_queue_only = FALSE;
1210 BOOL bi_option = FALSE;
1211 BOOL checking = FALSE;
1212 BOOL count_queue = FALSE;
1213 BOOL expansion_test = FALSE;
1214 BOOL extract_recipients = FALSE;
1215 BOOL forced_delivery = FALSE;
1216 BOOL f_end_dot = FALSE;
1217 BOOL deliver_give_up = FALSE;
1218 BOOL list_queue = FALSE;
1219 BOOL list_options = FALSE;
1220 BOOL local_queue_only;
1221 BOOL more = TRUE;
1222 BOOL one_msg_action = FALSE;
1223 BOOL queue_only_set = FALSE;
1224 BOOL receiving_message = TRUE;
1225 BOOL unprivileged;
1226 BOOL removed_privilege = FALSE;
1227 BOOL verify_address_mode = FALSE;
1228 BOOL verify_as_sender = FALSE;
1229 BOOL version_printed = FALSE;
1230 uschar *alias_arg = NULL;
1231 uschar *called_as = US"";
1232 uschar *start_queue_run_id = NULL;
1233 uschar *stop_queue_run_id = NULL;
1234 uschar *ftest_domain = NULL;
1235 uschar *ftest_localpart = NULL;
1236 uschar *ftest_prefix = NULL;
1237 uschar *ftest_suffix = NULL;
1238 uschar *real_sender_address;
1239 uschar *originator_home = US"/";
1240 void *reset_point;
1241
1242 struct passwd *pw;
1243 struct stat statbuf;
1244 pid_t passed_qr_pid = (pid_t)0;
1245 int passed_qr_pipe = -1;
1246 gid_t group_list[NGROUPS_MAX];
1247
1248 /* Possible options for -R and -S */
1249
1250 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1251
1252 /* Need to define this in case we need to change the environment in order
1253 to get rid of a bogus time zone. We have to make it char rather than uschar
1254 because some OS define it in /usr/include/unistd.h. */
1255
1256 extern char **environ;
1257
1258 /* If the Exim user and/or group and/or the configuration file owner/group were
1259 defined by ref:name at build time, we must now find the actual uid/gid values.
1260 This is a feature to make the lives of binary distributors easier. */
1261
1262 #ifdef EXIM_USERNAME
1263 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1264   {
1265   exim_gid = pw->pw_gid;
1266   }
1267 else
1268   {
1269   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1270     EXIM_USERNAME);
1271   exit(EXIT_FAILURE);
1272   }
1273 #endif
1274
1275 #ifdef EXIM_GROUPNAME
1276 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1277   {
1278   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1279     EXIM_GROUPNAME);
1280   exit(EXIT_FAILURE);
1281   }
1282 #endif
1283
1284 #ifdef CONFIGURE_OWNERNAME
1285 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1286   {
1287   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1288     CONFIGURE_OWNERNAME);
1289   exit(EXIT_FAILURE);
1290   }
1291 #endif
1292
1293 #ifdef CONFIGURE_GROUPNAME
1294 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1295   {
1296   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1297     CONFIGURE_GROUPNAME);
1298   exit(EXIT_FAILURE);
1299   }
1300 #endif
1301
1302 /* In the Cygwin environment, some initialization needs doing. It is fudged
1303 in by means of this macro. */
1304
1305 #ifdef OS_INIT
1306 OS_INIT
1307 #endif
1308
1309 /* Check a field which is patched when we are running Exim within its
1310 testing harness; do a fast initial check, and then the whole thing. */
1311
1312 running_in_test_harness =
1313   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1314
1315 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1316 at the start of a program; however, it seems that some environments do not
1317 follow this. A "strange" locale can affect the formatting of timestamps, so we
1318 make quite sure. */
1319
1320 setlocale(LC_ALL, "C");
1321
1322 /* Set up the default handler for timing using alarm(). */
1323
1324 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1325
1326 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1327 because store_malloc writes a log entry on failure. */
1328
1329 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1330 if (log_buffer == NULL)
1331   {
1332   fprintf(stderr, "exim: failed to get store for log buffer\n");
1333   exit(EXIT_FAILURE);
1334   }
1335
1336 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1337 NULL when the daemon is run and the file is closed. We have to use this
1338 indirection, because some systems don't allow writing to the variable "stderr".
1339 */
1340
1341 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1342
1343 /* Arrange for the PCRE regex library to use our store functions. Note that
1344 the normal calls are actually macros that add additional arguments for
1345 debugging purposes so we have to assign specially constructed functions here.
1346 The default is to use store in the stacking pool, but this is overridden in the
1347 regex_must_compile() function. */
1348
1349 pcre_malloc = function_store_get;
1350 pcre_free = function_dummy_free;
1351
1352 /* Ensure there is a big buffer for temporary use in several places. It is put
1353 in malloc store so that it can be freed for enlargement if necessary. */
1354
1355 big_buffer = store_malloc(big_buffer_size);
1356
1357 /* Set up the handler for the data request signal, and set the initial
1358 descriptive text. */
1359
1360 set_process_info("initializing");
1361 os_restarting_signal(SIGUSR1, usr1_handler);
1362
1363 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1364 in the daemon code. For the rest of Exim's uses, we ignore it. */
1365
1366 signal(SIGHUP, SIG_IGN);
1367
1368 /* We don't want to die on pipe errors as the code is written to handle
1369 the write error instead. */
1370
1371 signal(SIGPIPE, SIG_IGN);
1372
1373 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1374 set to SIG_IGN. This causes subprocesses that complete before the parent
1375 process waits for them not to hang around, so when Exim calls wait(), nothing
1376 is there. The wait() code has been made robust against this, but let's ensure
1377 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1378 ending status. We use sigaction rather than plain signal() on those OS where
1379 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1380 problem on AIX with this.) */
1381
1382 #ifdef SA_NOCLDWAIT
1383   {
1384   struct sigaction act;
1385   act.sa_handler = SIG_DFL;
1386   sigemptyset(&(act.sa_mask));
1387   act.sa_flags = 0;
1388   sigaction(SIGCHLD, &act, NULL);
1389   }
1390 #else
1391 signal(SIGCHLD, SIG_DFL);
1392 #endif
1393
1394 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1395 SIGHUP. */
1396
1397 sighup_argv = argv;
1398
1399 /* Set up the version number. Set up the leading 'E' for the external form of
1400 message ids, set the pointer to the internal form, and initialize it to
1401 indicate no message being processed. */
1402
1403 version_init();
1404 message_id_option[0] = '-';
1405 message_id_external = message_id_option + 1;
1406 message_id_external[0] = 'E';
1407 message_id = message_id_external + 1;
1408 message_id[0] = 0;
1409
1410 /* Set the umask to zero so that any files that Exim creates are created
1411 with the modes that it specifies. */
1412
1413 umask(0);
1414
1415 /* Precompile the regular expression for matching a message id. Keep this in
1416 step with the code that generates ids in the accept.c module. We need to do
1417 this here, because the -M options check their arguments for syntactic validity
1418 using mac_ismsgid, which uses this. */
1419
1420 regex_ismsgid =
1421   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1422
1423 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1424 this seems to be a generally accepted convention, since one finds symbolic
1425 links called "mailq" in standard OS configurations. */
1426
1427 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1428     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1429   {
1430   list_queue = TRUE;
1431   receiving_message = FALSE;
1432   called_as = US"-mailq";
1433   }
1434
1435 /* If the program is called as "rmail" treat it as equivalent to
1436 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1437 i.e. preventing a single dot on a line from terminating the message, and
1438 returning with zero return code, even in cases of error (provided an error
1439 message has been sent). */
1440
1441 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1442     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1443   {
1444   dot_ends = FALSE;
1445   called_as = US"-rmail";
1446   errors_sender_rc = EXIT_SUCCESS;
1447   }
1448
1449 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1450 this is a smail convention. */
1451
1452 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1453     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1454   {
1455   smtp_input = smtp_batched_input = TRUE;
1456   called_as = US"-rsmtp";
1457   }
1458
1459 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1460 this is a smail convention. */
1461
1462 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1463     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1464   {
1465   queue_interval = 0;
1466   receiving_message = FALSE;
1467   called_as = US"-runq";
1468   }
1469
1470 /* If the program is called as "newaliases" treat it as equivalent to
1471 "exim -bi"; this is a sendmail convention. */
1472
1473 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1474     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1475   {
1476   bi_option = TRUE;
1477   receiving_message = FALSE;
1478   called_as = US"-newaliases";
1479   }
1480
1481 /* Save the original effective uid for a couple of uses later. It should
1482 normally be root, but in some esoteric environments it may not be. */
1483
1484 original_euid = geteuid();
1485
1486 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1487 to be the same as the real ones. This makes a difference only if Exim is setuid
1488 (or setgid) to something other than root, which could be the case in some
1489 special configurations. */
1490
1491 real_uid = getuid();
1492 real_gid = getgid();
1493
1494 if (real_uid == root_uid)
1495   {
1496   setgid(real_gid);
1497   setuid(real_uid);
1498   }
1499
1500 /* If neither the original real uid nor the original euid was root, Exim is
1501 running in an unprivileged state. */
1502
1503 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1504
1505 /* If the first argument is --help, pretend there are no arguments. This will
1506 cause a brief message to be given. */
1507
1508 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1509
1510 /* Scan the program's arguments. Some can be dealt with right away; others are
1511 simply recorded for checking and handling afterwards. Do a high-level switch
1512 on the second character (the one after '-'), to save some effort. */
1513
1514 for (i = 1; i < argc; i++)
1515   {
1516   BOOL badarg = FALSE;
1517   uschar *arg = argv[i];
1518   uschar *argrest;
1519   int switchchar;
1520
1521   /* An argument not starting with '-' is the start of a recipients list;
1522   break out of the options-scanning loop. */
1523
1524   if (arg[0] != '-')
1525     {
1526     recipients_arg = i;
1527     break;
1528     }
1529
1530   /* An option consistion of -- terminates the options */
1531
1532   if (Ustrcmp(arg, "--") == 0)
1533     {
1534     recipients_arg = i + 1;
1535     break;
1536     }
1537
1538   /* Handle flagged options */
1539
1540   switchchar = arg[1];
1541   argrest = arg+2;
1542
1543   /* Make all -ex options synonymous with -oex arguments, since that
1544   is assumed by various callers. Also make -qR options synonymous with -R
1545   options, as that seems to be required as well. Allow for -qqR too, and
1546   the same for -S options. */
1547
1548   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1549       Ustrncmp(arg+1, "qR", 2) == 0 ||
1550       Ustrncmp(arg+1, "qS", 2) == 0)
1551     {
1552     switchchar = arg[2];
1553     argrest++;
1554     }
1555   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1556     {
1557     switchchar = arg[3];
1558     argrest += 2;
1559     queue_2stage = TRUE;
1560     }
1561
1562   /* Make -r synonymous with -f, since it is a documented alias */
1563
1564   else if (arg[1] == 'r') switchchar = 'f';
1565
1566   /* Make -ov synonymous with -v */
1567
1568   else if (Ustrcmp(arg, "-ov") == 0)
1569     {
1570     switchchar = 'v';
1571     argrest++;
1572     }
1573
1574   /* High-level switch on active initial letter */
1575
1576   switch(switchchar)
1577     {
1578     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1579     so has no need of it. */
1580
1581     case 'B':
1582     if (*argrest == 0) i++;       /* Skip over the type */
1583     break;
1584
1585
1586     case 'b':
1587     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1588
1589     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1590        -bdf: Ditto, but in the foreground.
1591     */
1592
1593     if (*argrest == 'd')
1594       {
1595       daemon_listen = TRUE;
1596       if (*(++argrest) == 'f') background_daemon = FALSE;
1597         else if (*argrest != 0) { badarg = TRUE; break; }
1598       }
1599
1600     /* -be: Run in expansion test mode */
1601
1602     else if (*argrest == 'e')
1603       expansion_test = checking = TRUE;
1604
1605     /* -bF:  Run system filter test */
1606
1607     else if (*argrest == 'F')
1608       {
1609       filter_test |= FTEST_SYSTEM;
1610       if (*(++argrest) != 0) { badarg = TRUE; break; }
1611       if (++i < argc) filter_test_sfile = argv[i]; else
1612         {
1613         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1614         exit(EXIT_FAILURE);
1615         }
1616       }
1617
1618     /* -bf:  Run user filter test
1619        -bfd: Set domain for filter testing
1620        -bfl: Set local part for filter testing
1621        -bfp: Set prefix for filter testing
1622        -bfs: Set suffix for filter testing
1623     */
1624
1625     else if (*argrest == 'f')
1626       {
1627       if (*(++argrest) == 0)
1628         {
1629         filter_test |= FTEST_USER;
1630         if (++i < argc) filter_test_ufile = argv[i]; else
1631           {
1632           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1633           exit(EXIT_FAILURE);
1634           }
1635         }
1636       else
1637         {
1638         if (++i >= argc)
1639           {
1640           fprintf(stderr, "exim: string expected after %s\n", arg);
1641           exit(EXIT_FAILURE);
1642           }
1643         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1644         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1645         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1646         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1647         else { badarg = TRUE; break; }
1648         }
1649       }
1650
1651     /* -bh: Host checking - an IP address must follow. */
1652
1653     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1654       {
1655       if (++i >= argc) { badarg = TRUE; break; }
1656       sender_host_address = argv[i];
1657       host_checking = checking = log_testing_mode = TRUE;
1658       host_checking_callout = argrest[1] == 'c';
1659       }
1660
1661     /* -bi: This option is used by sendmail to initialize *the* alias file,
1662     though it has the -oA option to specify a different file. Exim has no
1663     concept of *the* alias file, but since Sun's YP make script calls
1664     sendmail this way, some support must be provided. */
1665
1666     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1667
1668     /* -bm: Accept and deliver message - the default option. Reinstate
1669     receiving_message, which got turned off for all -b options. */
1670
1671     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1672
1673     /* -bnq: For locally originating messages, do not qualify unqualified
1674     addresses. In the envelope, this causes errors; in header lines they
1675     just get left. */
1676
1677     else if (Ustrcmp(argrest, "nq") == 0)
1678       {
1679       allow_unqualified_sender = FALSE;
1680       allow_unqualified_recipient = FALSE;
1681       }
1682
1683     /* -bpxx: List the contents of the mail queue, in various forms. If
1684     the option is -bpc, just a queue count is needed. Otherwise, if the
1685     first letter after p is r, then order is random. */
1686
1687     else if (*argrest == 'p')
1688       {
1689       if (*(++argrest) == 'c')
1690         {
1691         count_queue = TRUE;
1692         if (*(++argrest) != 0) badarg = TRUE;
1693         break;
1694         }
1695
1696       if (*argrest == 'r')
1697         {
1698         list_queue_option = 8;
1699         argrest++;
1700         }
1701       else list_queue_option = 0;
1702
1703       list_queue = TRUE;
1704
1705       /* -bp: List the contents of the mail queue, top-level only */
1706
1707       if (*argrest == 0) {}
1708
1709       /* -bpu: List the contents of the mail queue, top-level undelivered */
1710
1711       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1712
1713       /* -bpa: List the contents of the mail queue, including all delivered */
1714
1715       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1716
1717       /* Unknown after -bp[r] */
1718
1719       else
1720         {
1721         badarg = TRUE;
1722         break;
1723         }
1724       }
1725
1726
1727     /* -bP: List the configuration variables given as the address list.
1728     Force -v, so configuration errors get displayed. */
1729
1730     else if (Ustrcmp(argrest, "P") == 0)
1731       {
1732       list_options = TRUE;
1733       debug_selector |= D_v;
1734       debug_file = stderr;
1735       }
1736
1737     /* -brt: Test retry configuration lookup */
1738
1739     else if (Ustrcmp(argrest, "rt") == 0)
1740       {
1741       test_retry_arg = i + 1;
1742       goto END_ARG;
1743       }
1744
1745     /* -brw: Test rewrite configuration */
1746
1747     else if (Ustrcmp(argrest, "rw") == 0)
1748       {
1749       test_rewrite_arg = i + 1;
1750       goto END_ARG;
1751       }
1752
1753     /* -bS: Read SMTP commands on standard input, but produce no replies -
1754     all errors are reported by sending messages. */
1755
1756     else if (Ustrcmp(argrest, "S") == 0)
1757       smtp_input = smtp_batched_input = receiving_message = TRUE;
1758
1759     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1760     on standard output. */
1761
1762     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1763
1764     /* -bt: address testing mode */
1765
1766     else if (Ustrcmp(argrest, "t") == 0)
1767       address_test_mode = checking = log_testing_mode = TRUE;
1768
1769     /* -bv: verify addresses */
1770
1771     else if (Ustrcmp(argrest, "v") == 0)
1772       verify_address_mode = checking = log_testing_mode = TRUE;
1773
1774     /* -bvs: verify sender addresses */
1775
1776     else if (Ustrcmp(argrest, "vs") == 0)
1777       {
1778       verify_address_mode = checking = log_testing_mode = TRUE;
1779       verify_as_sender = TRUE;
1780       }
1781
1782     /* -bV: Print version string and support details */
1783
1784     else if (Ustrcmp(argrest, "V") == 0)
1785       {
1786       printf("Exim version %s #%s built %s\n", version_string,
1787         version_cnumber, version_date);
1788       printf("%s\n", CS version_copyright);
1789       version_printed = TRUE;
1790       show_whats_supported(stdout);
1791       }
1792
1793     else badarg = TRUE;
1794     break;
1795
1796
1797     /* -C: change configuration file list; ignore if it isn't really
1798     a change! Enforce a prefix check if required. */
1799
1800     case 'C':
1801     if (*argrest == 0)
1802       {
1803       if(++i < argc) argrest = argv[i]; else
1804         { badarg = TRUE; break; }
1805       }
1806     if (Ustrcmp(config_main_filelist, argrest) != 0)
1807       {
1808       #ifdef ALT_CONFIG_PREFIX
1809       int sep = 0;
1810       int len = Ustrlen(ALT_CONFIG_PREFIX);
1811       uschar *list = argrest;
1812       uschar *filename;
1813       while((filename = string_nextinlist(&list, &sep, big_buffer,
1814              big_buffer_size)) != NULL)
1815         {
1816         if ((Ustrlen(filename) < len ||
1817              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1818              Ustrstr(filename, "/../") != NULL) &&
1819              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1820           {
1821           fprintf(stderr, "-C Permission denied\n");
1822           exit(EXIT_FAILURE);
1823           }
1824         }
1825       #endif
1826
1827       config_main_filelist = argrest;
1828       config_changed = TRUE;
1829       }
1830     break;
1831
1832
1833     /* -D: set up a macro definition */
1834
1835     case 'D':
1836     #ifdef DISABLE_D_OPTION
1837     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1838     exit(EXIT_FAILURE);
1839     #else
1840       {
1841       int ptr = 0;
1842       macro_item *mlast = NULL;
1843       macro_item *m;
1844       uschar name[24];
1845       uschar *s = argrest;
1846
1847       while (isspace(*s)) s++;
1848
1849       if (*s < 'A' || *s > 'Z')
1850         {
1851         fprintf(stderr, "exim: macro name set by -D must start with "
1852           "an upper case letter\n");
1853         exit(EXIT_FAILURE);
1854         }
1855
1856       while (isalnum(*s) || *s == '_')
1857         {
1858         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1859         s++;
1860         }
1861       name[ptr] = 0;
1862       if (ptr == 0) { badarg = TRUE; break; }
1863       while (isspace(*s)) s++;
1864       if (*s != 0)
1865         {
1866         if (*s++ != '=') { badarg = TRUE; break; }
1867         while (isspace(*s)) s++;
1868         }
1869
1870       for (m = macros; m != NULL; m = m->next)
1871         {
1872         if (Ustrcmp(m->name, name) == 0)
1873           {
1874           fprintf(stderr, "exim: duplicated -D in command line\n");
1875           exit(EXIT_FAILURE);
1876           }
1877         mlast = m;
1878         }
1879
1880       m = store_get(sizeof(macro_item) + Ustrlen(name));
1881       m->next = NULL;
1882       m->command_line = TRUE;
1883       if (mlast == NULL) macros = m; else mlast->next = m;
1884       Ustrcpy(m->name, name);
1885       m->replacement = string_copy(s);
1886
1887       if (clmacro_count >= MAX_CLMACROS)
1888         {
1889         fprintf(stderr, "exim: too many -D options on command line\n");
1890         exit(EXIT_FAILURE);
1891         }
1892       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1893         m->replacement);
1894       }
1895     #endif
1896     break;
1897
1898     /* -d: Set debug level (see also -v below) or set the drop_cr option.
1899     The latter is now a no-op, retained for compatibility only. If -dd is used,
1900     debugging subprocesses of the daemon is disabled. */
1901
1902     case 'd':
1903     if (Ustrcmp(argrest, "ropcr") == 0)
1904       {
1905       /* drop_cr = TRUE; */
1906       }
1907
1908     /* Use an intermediate variable so that we don't set debugging while
1909     decoding the debugging bits. */
1910
1911     else
1912       {
1913       unsigned int selector = D_default;
1914       debug_selector = 0;
1915       debug_file = NULL;
1916       if (*argrest == 'd')
1917         {
1918         debug_daemon = TRUE;
1919         argrest++;
1920         }
1921       if (*argrest != 0)
1922         decode_bits(&selector, NULL, argrest, debug_options,
1923           debug_options_count, US"debug");
1924       debug_selector = selector;
1925       }
1926     break;
1927
1928
1929     /* -E: This is a local error message. This option is not intended for
1930     external use at all, but is not restricted to trusted callers because it
1931     does no harm (just suppresses certain error messages) and if Exim is run
1932     not setuid root it won't always be trusted when it generates error
1933     messages using this option. If there is a message id following -E, point
1934     message_reference at it, for logging. */
1935
1936     case 'E':
1937     local_error_message = TRUE;
1938     if (mac_ismsgid(argrest)) message_reference = argrest;
1939     break;
1940
1941
1942     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1943     option, so it looks as if historically the -oex options are also callable
1944     without the leading -o. So we have to accept them. Before the switch,
1945     anything starting -oe has been converted to -e. Exim does not support all
1946     of the sendmail error options. */
1947
1948     case 'e':
1949     if (Ustrcmp(argrest, "e") == 0)
1950       {
1951       arg_error_handling = ERRORS_SENDER;
1952       errors_sender_rc = EXIT_SUCCESS;
1953       }
1954     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1955     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1956     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1957     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1958     else badarg = TRUE;
1959     break;
1960
1961
1962     /* -F: Set sender's full name, used instead of the gecos entry from
1963     the password file. Since users can usually alter their gecos entries,
1964     there's no security involved in using this instead. The data can follow
1965     the -F or be in the next argument. */
1966
1967     case 'F':
1968     if (*argrest == 0)
1969       {
1970       if(++i < argc) argrest = argv[i]; else
1971         { badarg = TRUE; break; }
1972       }
1973     originator_name = argrest;
1974     break;
1975
1976
1977     /* -f: Set sender's address - this value is only actually used if Exim is
1978     run by a trusted user, or if untrusted_set_sender is set and matches the
1979     address, except that the null address can always be set by any user. The
1980     test for this happens later, when the value given here is ignored when not
1981     permitted. For an untrusted user, the actual sender is still put in Sender:
1982     if it doesn't match the From: header (unless no_local_from_check is set).
1983     The data can follow the -f or be in the next argument. The -r switch is an
1984     obsolete form of -f but since there appear to be programs out there that
1985     use anything that sendmail has ever supported, better accept it - the
1986     synonymizing is done before the switch above.
1987
1988     At this stage, we must allow domain literal addresses, because we don't
1989     know what the setting of allow_domain_literals is yet. Ditto for trailing
1990     dots and strip_trailing_dot. */
1991
1992     case 'f':
1993       {
1994       int start, end;
1995       uschar *errmess;
1996       if (*argrest == 0)
1997         {
1998         if (i+1 < argc) argrest = argv[++i]; else
1999           { badarg = TRUE; break; }
2000         }
2001       if (*argrest == 0)
2002         {
2003         sender_address = string_sprintf("");  /* Ensure writeable memory */
2004         }
2005       else
2006         {
2007         uschar *temp = argrest + Ustrlen(argrest) - 1;
2008         while (temp >= argrest && isspace(*temp)) temp--;
2009         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2010         allow_domain_literals = TRUE;
2011         strip_trailing_dot = TRUE;
2012         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2013           &sender_address_domain, TRUE);
2014         allow_domain_literals = FALSE;
2015         strip_trailing_dot = FALSE;
2016         if (sender_address == NULL)
2017           {
2018           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2019           return EXIT_FAILURE;
2020           }
2021         }
2022       sender_address_forced = TRUE;
2023       }
2024     break;
2025
2026     /* This is some Sendmail thing which can be ignored */
2027
2028     case 'G':
2029     break;
2030
2031     /* -h: Set the hop count for an incoming message. Exim does not currently
2032     support this; it always computes it by counting the Received: headers.
2033     To put it in will require a change to the spool header file format. */
2034
2035     case 'h':
2036     if (*argrest == 0)
2037       {
2038       if(++i < argc) argrest = argv[i]; else
2039         { badarg = TRUE; break; }
2040       }
2041     if (!isdigit(*argrest)) badarg = TRUE;
2042     break;
2043
2044
2045     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2046     not to be documented for sendmail but mailx (at least) uses it) */
2047
2048     case 'i':
2049     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2050     break;
2051
2052
2053     case 'M':
2054     receiving_message = FALSE;
2055
2056     /* -MC:  continue delivery of another message via an existing open
2057     file descriptor. This option is used for an internal call by the
2058     smtp transport when there is a pending message waiting to go to an
2059     address to which it has got a connection. Five subsequent arguments are
2060     required: transport name, host name, IP address, sequence number, and
2061     message_id. Transports may decline to create new processes if the sequence
2062     number gets too big. The channel is stdin. This (-MC) must be the last
2063     argument. There's a subsequent check that the real-uid is privileged.
2064
2065     If we are running in the test harness. delay for a bit, to let the process
2066     that set this one up complete. This makes for repeatability of the logging,
2067     etc. output. */
2068
2069     if (Ustrcmp(argrest, "C") == 0)
2070       {
2071       if (argc != i + 6)
2072         {
2073         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2074         return EXIT_FAILURE;
2075         }
2076
2077       if (msg_action_arg >= 0)
2078         {
2079         fprintf(stderr, "exim: incompatible arguments\n");
2080         return EXIT_FAILURE;
2081         }
2082
2083       continue_transport = argv[++i];
2084       continue_hostname = argv[++i];
2085       continue_host_address = argv[++i];
2086       continue_sequence = Uatoi(argv[++i]);
2087       msg_action = MSG_DELIVER;
2088       msg_action_arg = ++i;
2089       forced_delivery = TRUE;
2090       queue_run_pid = passed_qr_pid;
2091       queue_run_pipe = passed_qr_pipe;
2092
2093       if (!mac_ismsgid(argv[i]))
2094         {
2095         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2096           argv[i]);
2097         return EXIT_FAILURE;
2098         }
2099
2100       if (running_in_test_harness) millisleep(500);
2101       break;
2102       }
2103
2104     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2105     precedes -MC (see above). The flag indicates that the host to which
2106     Exim is connected has accepted an AUTH sequence. */
2107
2108     else if (Ustrcmp(argrest, "CA") == 0)
2109       {
2110       smtp_authenticated = TRUE;
2111       break;
2112       }
2113
2114     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2115     it preceded -MC (see above) */
2116
2117     else if (Ustrcmp(argrest, "CP") == 0)
2118       {
2119       smtp_use_pipelining = TRUE;
2120       break;
2121       }
2122
2123     /* -MCQ: pass on the pid of the queue-running process that started
2124     this chain of deliveries and the fd of its synchronizing pipe; this
2125     is useful only when it precedes -MC (see above) */
2126
2127     else if (Ustrcmp(argrest, "CQ") == 0)
2128       {
2129       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2130         else badarg = TRUE;
2131       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2132         else badarg = TRUE;
2133       break;
2134       }
2135
2136     /* -MCS: set the smtp_use_size flag; this is useful only when it
2137     precedes -MC (see above) */
2138
2139     else if (Ustrcmp(argrest, "CS") == 0)
2140       {
2141       smtp_use_size = TRUE;
2142       break;
2143       }
2144
2145     /* -MCT: set the tls_offered flag; this is useful only when it
2146     precedes -MC (see above). The flag indicates that the host to which
2147     Exim is connected has offered TLS support. */
2148
2149     #ifdef SUPPORT_TLS
2150     else if (Ustrcmp(argrest, "CT") == 0)
2151       {
2152       tls_offered = TRUE;
2153       break;
2154       }
2155     #endif
2156
2157     /* -M[x]: various operations on the following list of message ids:
2158        -M    deliver the messages, ignoring next retry times and thawing
2159        -Mc   deliver the messages, checking next retry times, no thawing
2160        -Mf   freeze the messages
2161        -Mg   give up on the messages
2162        -Mt   thaw the messages
2163        -Mrm  remove the messages
2164     In the above cases, this must be the last option. There are also the
2165     following options which are followed by a single message id, and which
2166     act on that message. Some of them use the "recipient" addresses as well.
2167        -Mar  add recipient(s)
2168        -Mmad mark all recipients delivered
2169        -Mmd  mark recipients(s) delivered
2170        -Mes  edit sender
2171        -Mvb  show body
2172        -Mvh  show header
2173        -Mvl  show log
2174     */
2175
2176     else if (*argrest == 0)
2177       {
2178       msg_action = MSG_DELIVER;
2179       forced_delivery = deliver_force_thaw = TRUE;
2180       }
2181     else if (Ustrcmp(argrest, "ar") == 0)
2182       {
2183       msg_action = MSG_ADD_RECIPIENT;
2184       one_msg_action = TRUE;
2185       }
2186     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2187     else if (Ustrcmp(argrest, "es") == 0)
2188       {
2189       msg_action = MSG_EDIT_SENDER;
2190       one_msg_action = TRUE;
2191       }
2192     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2193     else if (Ustrcmp(argrest, "g") == 0)
2194       {
2195       msg_action = MSG_DELIVER;
2196       deliver_give_up = TRUE;
2197       }
2198     else if (Ustrcmp(argrest, "mad") == 0)
2199       {
2200       msg_action = MSG_MARK_ALL_DELIVERED;
2201       }
2202     else if (Ustrcmp(argrest, "md") == 0)
2203       {
2204       msg_action = MSG_MARK_DELIVERED;
2205       one_msg_action = TRUE;
2206       }
2207     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2208     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2209     else if (Ustrcmp(argrest, "vb") == 0)
2210       {
2211       msg_action = MSG_SHOW_BODY;
2212       one_msg_action = TRUE;
2213       }
2214     else if (Ustrcmp(argrest, "vh") == 0)
2215       {
2216       msg_action = MSG_SHOW_HEADER;
2217       one_msg_action = TRUE;
2218       }
2219     else if (Ustrcmp(argrest, "vl") == 0)
2220       {
2221       msg_action = MSG_SHOW_LOG;
2222       one_msg_action = TRUE;
2223       }
2224     else { badarg = TRUE; break; }
2225
2226     /* All the -Mxx options require at least one message id. */
2227
2228     msg_action_arg = i + 1;
2229     if (msg_action_arg >= argc)
2230       {
2231       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2232       return EXIT_FAILURE;
2233       }
2234
2235     /* Some require only message ids to follow */
2236
2237     if (!one_msg_action)
2238       {
2239       int j;
2240       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2241         {
2242         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2243           argv[j], arg);
2244         return EXIT_FAILURE;
2245         }
2246       goto END_ARG;   /* Remaining args are ids */
2247       }
2248
2249     /* Others require only one message id, possibly followed by addresses,
2250     which will be handled as normal arguments. */
2251
2252     else
2253       {
2254       if (!mac_ismsgid(argv[msg_action_arg]))
2255         {
2256         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2257           argv[msg_action_arg], arg);
2258         return EXIT_FAILURE;
2259         }
2260       i++;
2261       }
2262     break;
2263
2264
2265     /* Some programs seem to call the -om option without the leading o;
2266     for sendmail it askes for "me too". Exim always does this. */
2267
2268     case 'm':
2269     if (*argrest != 0) badarg = TRUE;
2270     break;
2271
2272
2273     /* -N: don't do delivery - a debugging option that stops transports doing
2274     their thing. It implies debugging at the D_v level. */
2275
2276     case 'N':
2277     if (*argrest == 0)
2278       {
2279       dont_deliver = TRUE;
2280       debug_selector |= D_v;
2281       debug_file = stderr;
2282       }
2283     else badarg = TRUE;
2284     break;
2285
2286
2287     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2288     it. */
2289
2290     case 'n':
2291     break;
2292
2293     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2294     option to the specified value. This form uses long names. We need to handle
2295     -O option=value and -Ooption=value. */
2296
2297     case 'O':
2298     if (*argrest == 0)
2299       {
2300       if (++i >= argc)
2301         {
2302         fprintf(stderr, "exim: string expected after -O\n");
2303         exit(EXIT_FAILURE);
2304         }
2305       }
2306     break;
2307
2308     case 'o':
2309
2310     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2311     file" option). */
2312
2313     if (*argrest == 'A')
2314       {
2315       alias_arg = argrest + 1;
2316       if (alias_arg[0] == 0)
2317         {
2318         if (i+1 < argc) alias_arg = argv[++i]; else
2319           {
2320           fprintf(stderr, "exim: string expected after -oA\n");
2321           exit(EXIT_FAILURE);
2322           }
2323         }
2324       }
2325
2326     /* -oB: Set a connection message max value for remote deliveries */
2327
2328     else if (*argrest == 'B')
2329       {
2330       uschar *p = argrest + 1;
2331       if (p[0] == 0)
2332         {
2333         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2334           {
2335           connection_max_messages = 1;
2336           p = NULL;
2337           }
2338         }
2339
2340       if (p != NULL)
2341         {
2342         if (!isdigit(*p))
2343           {
2344           fprintf(stderr, "exim: number expected after -oB\n");
2345           exit(EXIT_FAILURE);
2346           }
2347         connection_max_messages = Uatoi(p);
2348         }
2349       }
2350
2351     /* -odb: background delivery */
2352
2353     else if (Ustrcmp(argrest, "db") == 0)
2354       {
2355       synchronous_delivery = FALSE;
2356       arg_queue_only = FALSE;
2357       queue_only_set = TRUE;
2358       }
2359
2360     /* -odf: foreground delivery (smail-compatible option); same effect as
2361        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2362     */
2363
2364     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2365       {
2366       synchronous_delivery = TRUE;
2367       arg_queue_only = FALSE;
2368       queue_only_set = TRUE;
2369       }
2370
2371     /* -odq: queue only */
2372
2373     else if (Ustrcmp(argrest, "dq") == 0)
2374       {
2375       synchronous_delivery = FALSE;
2376       arg_queue_only = TRUE;
2377       queue_only_set = TRUE;
2378       }
2379
2380     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2381     but no remote delivery */
2382
2383     else if (Ustrcmp(argrest, "dqs") == 0)
2384       {
2385       queue_smtp = TRUE;
2386       arg_queue_only = FALSE;
2387       queue_only_set = TRUE;
2388       }
2389
2390     /* -oex: Sendmail error flags. As these are also accepted without the
2391     leading -o prefix, for compatibility with vacation and other callers,
2392     they are handled with -e above. */
2393
2394     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2395        -oitrue: Another sendmail syntax for the same */
2396
2397     else if (Ustrcmp(argrest, "i") == 0 ||
2398              Ustrcmp(argrest, "itrue") == 0)
2399       dot_ends = FALSE;
2400
2401     /* -oM*: Set various characteristics for an incoming message; actually
2402     acted on for trusted callers only. */
2403
2404     else if (*argrest == 'M')
2405       {
2406       if (i+1 >= argc)
2407         {
2408         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2409         exit(EXIT_FAILURE);
2410         }
2411
2412       /* -oMa: Set sender host address */
2413
2414       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2415
2416       /* -oMaa: Set authenticator name */
2417
2418       else if (Ustrcmp(argrest, "Maa") == 0)
2419         sender_host_authenticated = argv[++i];
2420
2421       /* -oMas: setting authenticated sender */
2422
2423       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2424
2425       /* -oMai: setting authenticated id */
2426
2427       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2428
2429       /* -oMi: Set incoming interface address */
2430
2431       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2432
2433       /* -oMr: Received protocol */
2434
2435       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2436
2437       /* -oMs: Set sender host name */
2438
2439       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2440
2441       /* -oMt: Set sender ident */
2442
2443       else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2444
2445       /* Else a bad argument */
2446
2447       else
2448         {
2449         badarg = TRUE;
2450         break;
2451         }
2452       }
2453
2454     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2455     seem to call this as -m (undocumented), so that is also accepted (see
2456     above). */
2457
2458     else if (Ustrcmp(argrest, "m") == 0) {}
2459
2460     /* -oo: An ancient flag for old-style addresses which still seems to
2461     crop up in some calls (see in SCO). */
2462
2463     else if (Ustrcmp(argrest, "o") == 0) {}
2464
2465     /* -oP <name>: set pid file path for daemon */
2466
2467     else if (Ustrcmp(argrest, "P") == 0)
2468       override_pid_file_path = argv[++i];
2469
2470     /* -or <n>: set timeout for non-SMTP acceptance
2471        -os <n>: set timeout for SMTP acceptance */
2472
2473     else if (*argrest == 'r' || *argrest == 's')
2474       {
2475       int *tp = (*argrest == 'r')?
2476         &arg_receive_timeout : &arg_smtp_receive_timeout;
2477       if (argrest[1] == 0)
2478         {
2479         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2480         }
2481       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2482       if (*tp < 0)
2483         {
2484         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2485         exit(EXIT_FAILURE);
2486         }
2487       }
2488
2489     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2490
2491     else if (Ustrcmp(argrest, "X") == 0)
2492       override_local_interfaces = argv[++i];
2493
2494     /* Unknown -o argument */
2495
2496     else badarg = TRUE;
2497     break;
2498
2499
2500     /* -ps: force Perl startup; -pd force delayed Perl startup */
2501
2502     case 'p':
2503     #ifdef EXIM_PERL
2504     if (*argrest == 's' && argrest[1] == 0)
2505       {
2506       perl_start_option = 1;
2507       break;
2508       }
2509     if (*argrest == 'd' && argrest[1] == 0)
2510       {
2511       perl_start_option = -1;
2512       break;
2513       }
2514     #endif
2515
2516     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2517     which sets the host protocol and host name */
2518
2519     if (*argrest == 0)
2520       {
2521       if (i+1 < argc) argrest = argv[++i]; else
2522         { badarg = TRUE; break; }
2523       }
2524
2525     if (*argrest != 0)
2526       {
2527       uschar *hn = Ustrchr(argrest, ':');
2528       if (hn == NULL)
2529         {
2530         received_protocol = argrest;
2531         }
2532       else
2533         {
2534         received_protocol = string_copyn(argrest, hn - argrest);
2535         sender_host_name = hn + 1;
2536         }
2537       }
2538     break;
2539
2540
2541     case 'q':
2542     receiving_message = FALSE;
2543
2544     /* -qq...: Do queue runs in a 2-stage manner */
2545
2546     if (*argrest == 'q')
2547       {
2548       queue_2stage = TRUE;
2549       argrest++;
2550       }
2551
2552     /* -qi...: Do only first (initial) deliveries */
2553
2554     if (*argrest == 'i')
2555       {
2556       queue_run_first_delivery = TRUE;
2557       argrest++;
2558       }
2559
2560     /* -qf...: Run the queue, forcing deliveries
2561        -qff..: Ditto, forcing thawing as well */
2562
2563     if (*argrest == 'f')
2564       {
2565       queue_run_force = TRUE;
2566       if (*(++argrest) == 'f')
2567         {
2568         deliver_force_thaw = TRUE;
2569         argrest++;
2570         }
2571       }
2572
2573     /* -q[f][f]l...: Run the queue only on local deliveries */
2574
2575     if (*argrest == 'l')
2576       {
2577       queue_run_local = TRUE;
2578       argrest++;
2579       }
2580
2581     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2582     optionally starting from a given message id. */
2583
2584     if (*argrest == 0 &&
2585         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2586       {
2587       queue_interval = 0;
2588       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2589         start_queue_run_id = argv[++i];
2590       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2591         stop_queue_run_id = argv[++i];
2592       }
2593
2594     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2595     optionally local only. */
2596
2597     else
2598       {
2599       if (*argrest != 0)
2600         queue_interval = readconf_readtime(argrest, 0, FALSE);
2601       else
2602         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2603       if (queue_interval <= 0)
2604         {
2605         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2606         exit(EXIT_FAILURE);
2607         }
2608       }
2609     break;
2610
2611
2612     case 'R':   /* Synonymous with -qR... */
2613     receiving_message = FALSE;
2614
2615     /* -Rf:   As -R (below) but force all deliveries,
2616        -Rff:  Ditto, but also thaw all frozen messages,
2617        -Rr:   String is regex
2618        -Rrf:  Regex and force
2619        -Rrff: Regex and force and thaw
2620
2621     in all cases provided there are no further characters in this
2622     argument. */
2623
2624     if (*argrest != 0)
2625       {
2626       int i;
2627       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2628         {
2629         if (Ustrcmp(argrest, rsopts[i]) == 0)
2630           {
2631           if (i != 2) queue_run_force = TRUE;
2632           if (i >= 2) deliver_selectstring_regex = TRUE;
2633           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2634           argrest += Ustrlen(rsopts[i]);
2635           }
2636         }
2637       }
2638
2639     /* -R: Set string to match in addresses for forced queue run to
2640     pick out particular messages. */
2641
2642     if (*argrest == 0)
2643       {
2644       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2645         {
2646         fprintf(stderr, "exim: string expected after -R\n");
2647         exit(EXIT_FAILURE);
2648         }
2649       }
2650     else deliver_selectstring = argrest;
2651     if (queue_interval < 0) queue_interval = 0;
2652     break;
2653
2654
2655     /* -r: an obsolete synonym for -f (see above) */
2656
2657
2658     /* -S: Like -R but works on sender. */
2659
2660     case 'S':   /* Synonymous with -qS... */
2661     receiving_message = FALSE;
2662
2663     /* -Sf:   As -S (below) but force all deliveries,
2664        -Sff:  Ditto, but also thaw all frozen messages,
2665        -Sr:   String is regex
2666        -Srf:  Regex and force
2667        -Srff: Regex and force and thaw
2668
2669     in all cases provided there are no further characters in this
2670     argument. */
2671
2672     if (*argrest != 0)
2673       {
2674       int i;
2675       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2676         {
2677         if (Ustrcmp(argrest, rsopts[i]) == 0)
2678           {
2679           if (i != 2) queue_run_force = TRUE;
2680           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2681           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2682           argrest += Ustrlen(rsopts[i]);
2683           }
2684         }
2685       }
2686
2687     /* -S: Set string to match in addresses for forced queue run to
2688     pick out particular messages. */
2689
2690     if (*argrest == 0)
2691       {
2692       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2693         {
2694         fprintf(stderr, "exim: string expected after -S\n");
2695         exit(EXIT_FAILURE);
2696         }
2697       }
2698     else deliver_selectstring_sender = argrest;
2699     if (queue_interval < 0) queue_interval = 0;
2700     break;
2701
2702     /* -Tqt is an option that is exclusively for use by the testing suite.
2703     It is not recognized in other circumstances. It allows for the setting up
2704     of explicit "queue times" so that various warning/retry things can be
2705     tested. Otherwise variability of clock ticks etc. cause problems. */
2706
2707     case 'T':
2708     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2709       fudged_queue_times = argv[++i];
2710     else badarg = TRUE;
2711     break;
2712
2713
2714     /* -t: Set flag to extract recipients from body of message. */
2715
2716     case 't':
2717     if (*argrest == 0) extract_recipients = TRUE;
2718
2719     /* -ti: Set flag to extract recipients from body of message, and also
2720     specify that dot does not end the message. */
2721
2722     else if (Ustrcmp(argrest, "i") == 0)
2723       {
2724       extract_recipients = TRUE;
2725       dot_ends = FALSE;
2726       }
2727
2728     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2729
2730     #ifdef SUPPORT_TLS
2731     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2732     #endif
2733
2734     else badarg = TRUE;
2735     break;
2736
2737
2738     /* -U: This means "initial user submission" in sendmail, apparently. The
2739     doc claims that in future sendmail may refuse syntactically invalid
2740     messages instead of fixing them. For the moment, we just ignore it. */
2741
2742     case 'U':
2743     break;
2744
2745
2746     /* -v: verify things - this is a very low-level debugging */
2747
2748     case 'v':
2749     if (*argrest == 0)
2750       {
2751       debug_selector |= D_v;
2752       debug_file = stderr;
2753       }
2754     else badarg = TRUE;
2755     break;
2756
2757
2758     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2759
2760       The -x flag tells the sendmail command that mail from a local
2761       mail program has National Language Support (NLS) extended characters
2762       in the body of the mail item. The sendmail command can send mail with
2763       extended NLS characters across networks that normally corrupts these
2764       8-bit characters.
2765
2766     As Exim is 8-bit clean, it just ignores this flag. */
2767
2768     case 'x':
2769     if (*argrest != 0) badarg = TRUE;
2770     break;
2771
2772     /* All other initial characters are errors */
2773
2774     default:
2775     badarg = TRUE;
2776     break;
2777     }         /* End of high-level switch statement */
2778
2779   /* Failed to recognize the option, or syntax error */
2780
2781   if (badarg)
2782     {
2783     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2784       "option %s\n", arg);
2785     exit(EXIT_FAILURE);
2786     }
2787   }
2788
2789
2790 /* Arguments have been processed. Check for incompatibilities. */
2791
2792 END_ARG:
2793 if ((
2794     (smtp_input || extract_recipients || recipients_arg < argc) &&
2795     (daemon_listen || queue_interval >= 0 || bi_option ||
2796       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2797       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2798     ) ||
2799     (
2800     msg_action_arg > 0 &&
2801     (daemon_listen || queue_interval >= 0 || list_options || checking ||
2802      bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2803     ) ||
2804     (
2805     (daemon_listen || queue_interval >= 0) &&
2806     (sender_address != NULL || list_options || list_queue || checking ||
2807      bi_option)
2808     ) ||
2809     (
2810     daemon_listen && queue_interval == 0
2811     ) ||
2812     (
2813     list_options &&
2814     (checking || smtp_input || extract_recipients ||
2815       filter_test != FTEST_NONE || bi_option)
2816     ) ||
2817     (
2818     verify_address_mode &&
2819     (address_test_mode || smtp_input || extract_recipients ||
2820       filter_test != FTEST_NONE || bi_option)
2821     ) ||
2822     (
2823     address_test_mode && (smtp_input || extract_recipients ||
2824       filter_test != FTEST_NONE || bi_option)
2825     ) ||
2826     (
2827     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2828       extract_recipients)
2829     ) ||
2830     (
2831     deliver_selectstring != NULL && queue_interval < 0
2832     )
2833    )
2834   {
2835   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2836   exit(EXIT_FAILURE);
2837   }
2838
2839 /* If debugging is set up, set the file and the file descriptor to pass on to
2840 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2841 to run in the foreground. */
2842
2843 if (debug_selector != 0)
2844   {
2845   debug_file = stderr;
2846   debug_fd = fileno(debug_file);
2847   background_daemon = FALSE;
2848   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
2849   if (debug_selector != D_v)    /* -v only doesn't show this */
2850     {
2851     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2852       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2853       debug_selector);
2854     show_whats_supported(stderr);
2855     }
2856   }
2857
2858 /* When started with root privilege, ensure that the limits on the number of
2859 open files and the number of processes (where that is accessible) are
2860 sufficiently large, or are unset, in case Exim has been called from an
2861 environment where the limits are screwed down. Not all OS have the ability to
2862 change some of these limits. */
2863
2864 if (unprivileged)
2865   {
2866   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2867   }
2868 else
2869   {
2870   struct rlimit rlp;
2871
2872   #ifdef RLIMIT_NOFILE
2873   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2874     {
2875     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2876       strerror(errno));
2877     rlp.rlim_cur = rlp.rlim_max = 0;
2878     }
2879
2880   /* I originally chose 1000 as a nice big number that was unlikely to
2881   be exceeded. It turns out that some older OS have a fixed upper limit of
2882   256. */
2883
2884   if (rlp.rlim_cur < 1000)
2885     {
2886     rlp.rlim_cur = rlp.rlim_max = 1000;
2887     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2888       {
2889       rlp.rlim_cur = rlp.rlim_max = 256;
2890       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2891         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2892           strerror(errno));
2893       }
2894     }
2895   #endif
2896
2897   #ifdef RLIMIT_NPROC
2898   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2899     {
2900     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2901       strerror(errno));
2902     rlp.rlim_cur = rlp.rlim_max = 0;
2903     }
2904
2905   #ifdef RLIM_INFINITY
2906   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2907     {
2908     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2909   #else
2910   if (rlp.rlim_cur < 1000)
2911     {
2912     rlp.rlim_cur = rlp.rlim_max = 1000;
2913   #endif
2914     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2915       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2916         strerror(errno));
2917     }
2918   #endif
2919   }
2920
2921 /* Exim is normally entered as root (but some special configurations are
2922 possible that don't do this). However, it always spins off sub-processes that
2923 set their uid and gid as required for local delivery. We don't want to pass on
2924 any extra groups that root may belong to, so we want to get rid of them all at
2925 this point.
2926
2927 We need to obey setgroups() at this stage, before possibly giving up root
2928 privilege for a changed configuration file, but later on we might need to
2929 check on the additional groups for the admin user privilege - can't do that
2930 till after reading the config, which might specify the exim gid. Therefore,
2931 save the group list here first. */
2932
2933 group_count = getgroups(NGROUPS_MAX, group_list);
2934
2935 /* There is a fundamental difference in some BSD systems in the matter of
2936 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2937 known not to be different. On the "different" systems there is a single group
2938 list, and the first entry in it is the current group. On all other versions of
2939 Unix there is a supplementary group list, which is in *addition* to the current
2940 group. Consequently, to get rid of all extraneous groups on a "standard" system
2941 you pass over 0 groups to setgroups(), while on a "different" system you pass
2942 over a single group - the current group, which is always the first group in the
2943 list. Calling setgroups() with zero groups on a "different" system results in
2944 an error return. The following code should cope with both types of system.
2945
2946 However, if this process isn't running as root, setgroups() can't be used
2947 since you have to be root to run it, even if throwing away groups. Not being
2948 root here happens only in some unusual configurations. We just ignore the
2949 error. */
2950
2951 if (setgroups(0, NULL) != 0)
2952   {
2953   if (setgroups(1, group_list) != 0 && !unprivileged)
2954     {
2955     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2956     exit(EXIT_FAILURE);
2957     }
2958   }
2959
2960 /* If the configuration file name has been altered by an argument on the
2961 command line (either a new file name or a macro definition) and the caller is
2962 not root or the exim user, or if this is a filter testing run, remove any
2963 setuid privilege the program has, and run as the underlying user.
2964
2965 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2966 severely restricts the use of -C for some purposes.
2967
2968 Otherwise, set the real ids to the effective values (should be root unless run
2969 from inetd, which it can either be root or the exim uid, if one is configured).
2970
2971 There is a private mechanism for bypassing some of this, in order to make it
2972 possible to test lots of configurations automatically, without having either to
2973 recompile each time, or to patch in an actual configuration file name and other
2974 values (such as the path name). If running in the test harness, pretend that
2975 configuration file changes and macro definitions haven't happened. */
2976
2977 if ((                                            /* EITHER */
2978     (config_changed || macros != NULL) &&        /* Config changed, and */
2979     real_uid != root_uid &&                      /* Not root, and */
2980     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
2981     real_uid != exim_uid &&                      /* Not exim, and */
2982     #endif
2983     !running_in_test_harness                     /* Not fudged */
2984     ) ||                                         /*   OR   */
2985     expansion_test                               /* expansion testing */
2986     ||                                           /*   OR   */
2987     filter_test != FTEST_NONE)                   /* Filter testing */
2988   {
2989   setgroups(group_count, group_list);
2990   exim_setugid(real_uid, real_gid, FALSE,
2991     US"-C, -D, -be or -bf forces real uid");
2992   removed_privilege = TRUE;
2993
2994   /* In the normal case when Exim is called like this, stderr is available
2995   and should be used for any logging information because attempts to write
2996   to the log will usually fail. To arrange this, we unset really_exim. However,
2997   if no stderr is available there is no point - we might as well have a go
2998   at the log (if it fails, syslog will be written). */
2999
3000   if (log_stderr != NULL) really_exim = FALSE;
3001   }
3002
3003 /* Privilege is to be retained for the moment. It may be dropped later,
3004 depending on the job that this Exim process has been asked to do. For now, set
3005 the real uid to the effective so that subsequent re-execs of Exim are done by a
3006 privileged user. */
3007
3008 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3009
3010 /* If testing a filter, open the file(s) now, before wasting time doing other
3011 setups and reading the message. */
3012
3013 if ((filter_test & FTEST_SYSTEM) != 0)
3014   {
3015   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3016   if (filter_sfd < 0)
3017     {
3018     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3019       strerror(errno));
3020     return EXIT_FAILURE;
3021     }
3022   }
3023
3024 if ((filter_test & FTEST_USER) != 0)
3025   {
3026   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3027   if (filter_ufd < 0)
3028     {
3029     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3030       strerror(errno));
3031     return EXIT_FAILURE;
3032     }
3033   }
3034
3035 /* Read the main runtime configuration data; this gives up if there
3036 is a failure. It leaves the configuration file open so that the subsequent
3037 configuration data for delivery can be read if needed. */
3038
3039 readconf_main();
3040
3041 /* Handle the decoding of logging options. */
3042
3043 decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
3044   log_options, log_options_count, US"log");
3045
3046 DEBUG(D_any)
3047   {
3048   debug_printf("configuration file is %s\n", config_main_filename);
3049   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3050     log_extra_selector);
3051   }
3052
3053 /* If domain literals are not allowed, check the sender address that was
3054 supplied with -f. Ditto for a stripped trailing dot. */
3055
3056 if (sender_address != NULL)
3057   {
3058   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3059     {
3060     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3061       "allowed\n", sender_address);
3062     return EXIT_FAILURE;
3063     }
3064   if (f_end_dot && !strip_trailing_dot)
3065     {
3066     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3067       "(trailing dot not allowed)\n", sender_address);
3068     return EXIT_FAILURE;
3069     }
3070   }
3071
3072 /* Paranoia check of maximum lengths of certain strings. There is a check
3073 on the length of the log file path in log.c, which will come into effect
3074 if there are any calls to write the log earlier than this. However, if we
3075 get this far but the string is very long, it is better to stop now than to
3076 carry on and (e.g.) receive a message and then have to collapse. The call to
3077 log_write() from here will cause the ultimate panic collapse if the complete
3078 file name exceeds the buffer length. */
3079
3080 if (Ustrlen(log_file_path) > 200)
3081   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3082     "log_file_path is longer than 200 chars: aborting");
3083
3084 if (Ustrlen(pid_file_path) > 200)
3085   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3086     "pid_file_path is longer than 200 chars: aborting");
3087
3088 if (Ustrlen(spool_directory) > 200)
3089   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3090     "spool_directory is longer than 200 chars: aborting");
3091
3092 /* Length check on the process name given to syslog for its TAG field,
3093 which is only permitted to be 32 characters or less. See RFC 3164. */
3094
3095 if (Ustrlen(syslog_processname) > 32)
3096   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3097     "syslog_processname is longer than 32 chars: aborting");
3098
3099 /* In some operating systems, the environment variable TMPDIR controls where
3100 temporary files are created; Exim doesn't use these (apart from when delivering
3101 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3102 If TMPDIR is found in the environment, reset it to the value defined in the
3103 TMPDIR macro, if this macro is defined. */
3104
3105 #ifdef TMPDIR
3106   {
3107   uschar **p;
3108   for (p = USS environ; *p != NULL; p++)
3109     {
3110     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3111         Ustrcmp(*p+7, TMPDIR) != 0)
3112       {
3113       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3114       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3115       *p = newp;
3116       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3117       }
3118     }
3119   }
3120 #endif
3121
3122 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3123 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3124 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3125 called by a user who has set the TZ variable. This then affects the timestamps
3126 in log files and in Received: headers, and any created Date: header lines. The
3127 required timezone is settable in the configuration file, so nothing can be done
3128 about this earlier - but hopefully nothing will normally be logged earlier than
3129 this. We have to make a new environment if TZ is wrong, but don't bother if
3130 timestamps_utc is set, because then all times are in UTC anyway. */
3131
3132 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3133   {
3134   timestamps_utc = TRUE;
3135   }
3136 else
3137   {
3138   uschar *envtz = US getenv("TZ");
3139   if ((envtz == NULL && timezone_string != NULL) ||
3140       (envtz != NULL &&
3141         (timezone_string == NULL ||
3142          Ustrcmp(timezone_string, envtz) != 0)))
3143     {
3144     uschar **p = USS environ;
3145     uschar **new;
3146     uschar **newp;
3147     int count = 0;
3148     while (*p++ != NULL) count++;
3149     if (envtz == NULL) count++;
3150     newp = new = malloc(sizeof(uschar *) * (count + 1));
3151     for (p = USS environ; *p != NULL; p++)
3152       {
3153       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3154       *newp++ = *p;
3155       }
3156     if (timezone_string != NULL)
3157       {
3158       *newp = malloc(Ustrlen(timezone_string) + 4);
3159       sprintf(CS *newp++, "TZ=%s", timezone_string);
3160       }
3161     *newp = NULL;
3162     environ = CSS new;
3163     tzset();
3164     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3165       tod_stamp(tod_log));
3166     }
3167   }
3168
3169 /* Handle the case when we have removed the setuid privilege because of -C or
3170 -D. This means that the caller of Exim was not root, and, provided that
3171 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3172 the binary.
3173
3174 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3175 were running as the exim user defined in the configuration file (different to
3176 the one in the binary). The sysadmin may expect this case to retain privilege
3177 because "the binary was called by the Exim user", but it hasn't, because of the
3178 order in which it handles this stuff. There are two possibilities:
3179
3180   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3181       to do message deliveries. Thus, the fact that it is running as a
3182       non-privileged user is plausible, and might be wanted in some special
3183       configurations. However, really_exim will have been set false when
3184       privilege was dropped, to stop Exim trying to write to its normal log
3185       files. Therefore, re-enable normal log processing, assuming the sysadmin
3186       has set up the log directory correctly.
3187
3188   (2) If deliver_drop_privilege is not set, the configuration won't work as
3189       apparently intended, and so we log a panic message. In order to retain
3190       root for -C or -D, the caller must either be root or the Exim user
3191       defined in the binary (when deliver_drop_ privilege is false).
3192
3193 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3194 built-in exim user or one defined in the configuration. In either event,
3195 re-enable log processing, assuming the sysadmin knows what they are doing. */
3196
3197 if (removed_privilege && (config_changed || macros != NULL) &&
3198     real_uid == exim_uid)
3199   {
3200   #ifdef ALT_CONFIG_ROOT_ONLY
3201   really_exim = TRUE;   /* let logging work normally */
3202   #else
3203
3204   if (deliver_drop_privilege)
3205     really_exim = TRUE; /* let logging work normally */
3206   else
3207     log_write(0, LOG_MAIN|LOG_PANIC,
3208       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3209       (int)exim_uid, config_changed? "-C" : "-D");
3210   #endif
3211   }
3212
3213 /* Start up Perl interpreter if Perl support is configured and there is a
3214 perl_startup option, and the configuration or the command line specifies
3215 initializing starting. Note that the global variables are actually called
3216 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3217
3218 #ifdef EXIM_PERL
3219 if (perl_start_option != 0)
3220   opt_perl_at_start = (perl_start_option > 0);
3221 if (opt_perl_at_start && opt_perl_startup != NULL)
3222   {
3223   uschar *errstr;
3224   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3225   errstr = init_perl(opt_perl_startup);
3226   if (errstr != NULL)
3227     {
3228     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3229     return EXIT_FAILURE;
3230     }
3231   opt_perl_started = TRUE;
3232   }
3233 #endif /* EXIM_PERL */
3234
3235 /* Log the arguments of the call if the configuration file said so. This is
3236 a debugging feature for finding out what arguments certain MUAs actually use.
3237 Don't attempt it if logging is disabled, or if listing variables or if
3238 verifying/testing addresses or expansions. */
3239
3240 if ((log_extra_selector & LX_arguments) != 0 && really_exim
3241      && !list_options && !checking)
3242   {
3243   int i;
3244   uschar *p = big_buffer;
3245   Ustrcpy(p, "cwd=");
3246   (void)getcwd(CS p+4, big_buffer_size - 4);
3247   while (*p) p++;
3248   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3249   while (*p) p++;
3250   for (i = 0; i < argc; i++)
3251     {
3252     int len = Ustrlen(argv[i]);
3253     uschar *printing;
3254     uschar *quote;
3255     if (p + len + 8 >= big_buffer + big_buffer_size)
3256       {
3257       Ustrcpy(p, " ...");
3258       log_write(0, LOG_MAIN, "%s", big_buffer);
3259       Ustrcpy(big_buffer, "...");
3260       p = big_buffer + 3;
3261       }
3262     printing = string_printing(argv[i]);
3263     if (printing[0] == 0) quote = US"\""; else
3264       {
3265       uschar *pp = printing;
3266       quote = US"";
3267       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3268       }
3269     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3270       (p - big_buffer) - 4), printing, quote);
3271     while (*p) p++;
3272     }
3273   log_write(0, LOG_MAIN, "%s", big_buffer);
3274   }
3275
3276 /* Set the working directory to be the top-level spool directory. We don't rely
3277 on this in the code, which always uses fully qualified names, but it's useful
3278 for core dumps etc. Don't complain if it fails - the spool directory might not
3279 be generally accessible and calls with the -C option (and others) have lost
3280 privilege by now. */
3281
3282 if (Uchdir(spool_directory) != 0)
3283   {
3284   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3285   (void)Uchdir(spool_directory);
3286   }
3287
3288 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3289 alias file. Exim doesn't have such a concept, but this call is screwed into
3290 Sun's YP makefiles. Handle this by calling a configured script, as the real
3291 user who called Exim. The -oA option can be used to pass an argument to the
3292 script. */
3293
3294 if (bi_option)
3295   {
3296   fclose(config_file);
3297   if (bi_command != NULL)
3298     {
3299     int i = 0;
3300     uschar *argv[3];
3301     argv[i++] = bi_command;
3302     if (alias_arg != NULL) argv[i++] = alias_arg;
3303     argv[i++] = NULL;
3304
3305     setgroups(group_count, group_list);
3306     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3307
3308     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3309       (argv[1] == NULL)? US"" : argv[1]);
3310
3311     execv(CS argv[0], (char *const *)argv);
3312     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3313     exit(EXIT_FAILURE);
3314     }
3315   else
3316     {
3317     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3318     exit(EXIT_SUCCESS);
3319     }
3320   }
3321
3322 /* If an action on specific messages is requested, or if a daemon or queue
3323 runner is being started, we need to know if Exim was called by an admin user.
3324 This is the case if the real user is root or exim, or if the real group is
3325 exim, or if one of the supplementary groups is exim or a group listed in
3326 admin_groups. We don't fail all message actions immediately if not admin_user,
3327 since some actions can be performed by non-admin users. Instead, set admin_user
3328 for later interrogation. */
3329
3330 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3331   admin_user = TRUE;
3332 else
3333   {
3334   int i, j;
3335
3336   for (i = 0; i < group_count; i++)
3337     {
3338     if (group_list[i] == exim_gid) admin_user = TRUE;
3339     else if (admin_groups != NULL)
3340       {
3341       for (j = 1; j <= (int)(admin_groups[0]); j++)
3342         if (admin_groups[j] == group_list[i])
3343           { admin_user = TRUE; break; }
3344       }
3345     if (admin_user) break;
3346     }
3347   }
3348
3349 /* Another group of privileged users are the trusted users. These are root,
3350 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3351 are permitted to specify sender_addresses with -f on the command line, and
3352 other message parameters as well. */
3353
3354 if (real_uid == root_uid || real_uid == exim_uid)
3355   trusted_caller = TRUE;
3356 else
3357   {
3358   int i, j;
3359
3360   if (trusted_users != NULL)
3361     {
3362     for (i = 1; i <= (int)(trusted_users[0]); i++)
3363       if (trusted_users[i] == real_uid)
3364         { trusted_caller = TRUE; break; }
3365     }
3366
3367   if (!trusted_caller && trusted_groups != NULL)
3368     {
3369     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3370       {
3371       if (trusted_groups[i] == real_gid)
3372         trusted_caller = TRUE;
3373       else for (j = 0; j < group_count; j++)
3374         {
3375         if (trusted_groups[i] == group_list[j])
3376           { trusted_caller = TRUE; break; }
3377         }
3378       if (trusted_caller) break;
3379       }
3380     }
3381   }
3382
3383 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3384 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3385
3386 /* Only an admin user may start the daemon or force a queue run in the default
3387 configuration, but the queue run restriction can be relaxed. Only an admin
3388 user may request that a message be returned to its sender forthwith. Only an
3389 admin user may specify a debug level greater than D_v (because it might show
3390 passwords, etc. in lookup queries). Only an admin user may request a queue
3391 count. */
3392
3393 if (!admin_user)
3394   {
3395   BOOL debugset = (debug_selector & ~D_v) != 0;
3396   if (deliver_give_up || daemon_listen ||
3397      (count_queue && queue_list_requires_admin) ||
3398      (list_queue && queue_list_requires_admin) ||
3399      (queue_interval >= 0 && prod_requires_admin) ||
3400      (debugset && !running_in_test_harness))
3401     {
3402     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3403     exit(EXIT_FAILURE);
3404     }
3405   }
3406
3407 /* If the real user is not root or the exim uid, the argument for passing
3408 in an open TCP/IP connection for another message is not permitted, nor is
3409 running with the -N option for any delivery action, unless this call to exim is
3410 one that supplied an input message, or we are using a patched exim for
3411 regression testing. */
3412
3413 if (real_uid != root_uid && real_uid != exim_uid &&
3414      (continue_hostname != NULL ||
3415        (dont_deliver &&
3416          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3417        )) && !running_in_test_harness)
3418   {
3419   fprintf(stderr, "exim: Permission denied\n");
3420   return EXIT_FAILURE;
3421   }
3422
3423 /* If the caller is not trusted, certain arguments are ignored when running for
3424 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3425 Note that authority for performing certain actions on messages is tested in the
3426 queue_action() function. */
3427
3428 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3429   {
3430   sender_host_name = sender_host_address = interface_address =
3431     sender_ident = received_protocol = NULL;
3432   sender_host_port = interface_port = 0;
3433   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3434   }
3435
3436 /* If a sender host address is set, extract the optional port number off the
3437 end of it and check its syntax. Do the same thing for the interface address.
3438 Exim exits if the syntax is bad. */
3439
3440 else
3441   {
3442   if (sender_host_address != NULL)
3443     sender_host_port = check_port(sender_host_address);
3444   if (interface_address != NULL)
3445     interface_port = check_port(interface_address);
3446   }
3447
3448 /* If an SMTP message is being received check to see if the standard input is a
3449 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3450 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3451 barf. */
3452
3453 if (smtp_input)
3454   {
3455   union sockaddr_46 inetd_sock;
3456   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3457   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3458     {
3459     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3460     if (family == AF_INET || family == AF_INET6)
3461       {
3462       union sockaddr_46 interface_sock;
3463       size = sizeof(interface_sock);
3464
3465       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3466         interface_address = host_ntoa(-1, &interface_sock, NULL,
3467           &interface_port);
3468
3469       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3470
3471       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3472         {
3473         is_inetd = TRUE;
3474         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3475           NULL, &sender_host_port);
3476         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3477           "inetd is not supported when mua_wrapper is set");
3478         }
3479       else
3480         {
3481         fprintf(stderr,
3482           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3483         return EXIT_FAILURE;
3484         }
3485       }
3486     }
3487   }
3488
3489 /* If the load average is going to be needed while receiving a message, get it
3490 now for those OS that require the first call to os_getloadavg() to be done as
3491 root. There will be further calls later for each message received. */
3492
3493 #ifdef LOAD_AVG_NEEDS_ROOT
3494 if (receiving_message &&
3495       (queue_only_load >= 0 ||
3496         (is_inetd && smtp_load_reserve >= 0)
3497       ))
3498   {
3499   load_average = os_getloadavg();
3500   }
3501 #endif
3502
3503 /* The queue_only configuration option can be overridden by -odx on the command
3504 line, except that if queue_only_override is false, queue_only cannot be unset
3505 from the command line. */
3506
3507 if (queue_only_set && (queue_only_override || arg_queue_only))
3508   queue_only = arg_queue_only;
3509
3510 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3511 -or and -os. */
3512
3513 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3514 if (arg_smtp_receive_timeout >= 0)
3515   smtp_receive_timeout = arg_smtp_receive_timeout;
3516
3517 /* If Exim was started with root privilege, unless we have already removed the
3518 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3519 except when starting the daemon or doing some kind of delivery or address
3520 testing (-bt). These are the only cases when root need to be retained. We run
3521 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3522 retained only for starting the daemon. */
3523
3524 if (!unprivileged &&                      /* originally had root AND */
3525     !removed_privilege &&                 /* still got root AND      */
3526     !daemon_listen &&                     /* not starting the daemon */
3527     queue_interval <= 0 &&                /* (either kind of daemon) */
3528       (                                   /*    AND EITHER           */
3529       deliver_drop_privilege ||           /* requested unprivileged  */
3530         (                                 /*       OR                */
3531         queue_interval < 0 &&             /* not running the queue   */
3532         (msg_action_arg < 0 ||            /*       and               */
3533           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3534         (!checking || !address_test_mode) /* not address checking    */
3535         )
3536       ))
3537   {
3538   exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3539   }
3540
3541 /* When we are retaining a privileged uid, we still change to the exim gid. */
3542
3543 else setgid(exim_gid);
3544
3545 /* Handle a request to list the delivery queue */
3546
3547 if (list_queue)
3548   {
3549   set_process_info("listing the queue");
3550   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3551   exit(EXIT_SUCCESS);
3552   }
3553
3554 /* Handle a request to count the delivery queue */
3555
3556 if (count_queue)
3557   {
3558   set_process_info("counting the queue");
3559   queue_count();
3560   exit(EXIT_SUCCESS);
3561   }
3562
3563 /* Handle actions on specific messages, except for the force delivery action,
3564 which is done below. Some actions take a whole list of message ids, which
3565 are known to continue up to the end of the arguments. Others take a single
3566 message id and then operate on the recipients list. */
3567
3568 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3569   {
3570   int yield = EXIT_SUCCESS;
3571   set_process_info("acting on specified messages");
3572
3573   if (!one_msg_action)
3574     {
3575     for (i = msg_action_arg; i < argc; i++)
3576       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3577         yield = EXIT_FAILURE;
3578     }
3579
3580   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3581     recipients_arg)) yield = EXIT_FAILURE;
3582   exit(yield);
3583   }
3584
3585 /* All the modes below here require the remaining configuration sections
3586 to be read, except that we can skip over the ACL setting when delivering
3587 specific messages, or doing a queue run. (For various testing cases we could
3588 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3589 for skipping. */
3590
3591 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3592
3593 /* The configuration data will have been read into POOL_PERM because we won't
3594 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3595 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3596 configuration were read into POOL_MAIN, because we don't do any resets till
3597 later on. However, it seems right, and it does ensure that both pools get used.
3598 */
3599
3600 store_pool = POOL_MAIN;
3601
3602 /* Handle the -brt option. This is for checking out retry configurations.
3603 The next three arguments are a domain name or a complete address, and
3604 optionally two error numbers. All it does is to call the function that
3605 scans the retry configuration data. */
3606
3607 if (test_retry_arg >= 0)
3608   {
3609   retry_config *yield;
3610   int basic_errno = 0;
3611   int more_errno = 0;
3612   uschar *s1, *s2;
3613
3614   if (test_retry_arg >= argc)
3615     {
3616     printf("-brt needs a domain or address argument\n");
3617     exim_exit(EXIT_FAILURE);
3618     }
3619   s1 = argv[test_retry_arg++];
3620   s2 = NULL;
3621
3622   /* If the first argument contains no @ and no . it might be a local user
3623   or it might be a single-component name. Treat as a domain. */
3624
3625   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3626     {
3627     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3628       "being \ntreated as a one-component domain, not as a local part.\n\n",
3629       s1);
3630     }
3631
3632   /* There may be an optional second domain arg. */
3633
3634   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3635     s2 = argv[test_retry_arg++];
3636
3637   /* The final arg is an error name */
3638
3639   if (test_retry_arg < argc)
3640     {
3641     uschar *ss = argv[test_retry_arg];
3642     uschar *error =
3643       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3644     if (error != NULL)
3645       {
3646       printf("%s\n", CS error);
3647       return EXIT_FAILURE;
3648       }
3649
3650     /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3651     an error is for matching codes to the decade. Turn them into a real error
3652     code, off the decade. */
3653
3654     if (basic_errno == ERRNO_RCPT4XX)
3655       {
3656       int code = (more_errno >> 8) & 255;
3657       if (code == 255)
3658         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3659       else if (code > 100)
3660         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3661       }
3662     }
3663
3664   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3665   if (yield == NULL) printf("No retry information found\n"); else
3666     {
3667     retry_rule *r;
3668     more_errno = yield->more_errno;
3669     printf("Retry rule: %s  ", yield->pattern);
3670
3671     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3672       {
3673       printf("quota%s%s  ",
3674         (more_errno > 0)? "_" : "",
3675         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3676       }
3677     else if (yield->basic_errno == ECONNREFUSED)
3678       {
3679       printf("refused%s%s  ",
3680         (more_errno > 0)? "_" : "",
3681         (more_errno == 'M')? "MX" :
3682         (more_errno == 'A')? "A" : "");
3683       }
3684     else if (yield->basic_errno == ETIMEDOUT)
3685       {
3686       printf("timeout");
3687       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3688       more_errno &= 255;
3689       if (more_errno != 0) printf("_%s",
3690         (more_errno == 'M')? "MX" : "A");
3691       printf("  ");
3692       }
3693     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3694       printf("auth_failed  ");
3695     else printf("*  ");
3696
3697     for (r = yield->rules; r != NULL; r = r->next)
3698       {
3699       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3700       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3701       if (r->rule == 'G')
3702         {
3703         int x = r->p2;
3704         int f = x % 1000;
3705         int d = 100;
3706         printf(",%d.", x/1000);
3707         do
3708           {
3709           printf("%d", f/d);
3710           f %= d;
3711           d /= 10;
3712           }
3713         while (f != 0);
3714         }
3715       printf("; ");
3716       }
3717
3718     printf("\n");
3719     }
3720   exim_exit(EXIT_SUCCESS);
3721   }
3722
3723 /* Handle a request to list one or more configuration options */
3724
3725 if (list_options)
3726   {
3727   set_process_info("listing variables");
3728   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3729     else for (i = recipients_arg; i < argc; i++)
3730       {
3731       if (i < argc - 1 &&
3732           (Ustrcmp(argv[i], "router") == 0 ||
3733            Ustrcmp(argv[i], "transport") == 0 ||
3734            Ustrcmp(argv[i], "authenticator") == 0))
3735         {
3736         readconf_print(argv[i+1], argv[i]);
3737         i++;
3738         }
3739       else readconf_print(argv[i], NULL);
3740       }
3741   exim_exit(EXIT_SUCCESS);
3742   }
3743
3744
3745 /* Handle a request to deliver one or more messages that are already on the
3746 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3747 is typically used for a small number when prodding by hand (when the option
3748 forced_delivery will be set) or when re-execing to regain root privilege.
3749 Each message delivery must happen in a separate process, so we fork a process
3750 for each one, and run them sequentially so that debugging output doesn't get
3751 intertwined, and to avoid spawning too many processes if a long list is given.
3752 However, don't fork for the last one; this saves a process in the common case
3753 when Exim is called to deliver just one message. */
3754
3755 if (msg_action_arg > 0)
3756   {
3757   if (prod_requires_admin && !admin_user)
3758     {
3759     fprintf(stderr, "exim: Permission denied\n");
3760     exim_exit(EXIT_FAILURE);
3761     }
3762   set_process_info("delivering specified messages");
3763   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3764   for (i = msg_action_arg; i < argc; i++)
3765     {
3766     int status;
3767     pid_t pid;
3768     if (i == argc - 1)
3769       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3770     else if ((pid = fork()) == 0)
3771       {
3772       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3773       _exit(EXIT_SUCCESS);
3774       }
3775     else if (pid < 0)
3776       {
3777       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3778         strerror(errno));
3779       exim_exit(EXIT_FAILURE);
3780       }
3781     else wait(&status);
3782     }
3783   exim_exit(EXIT_SUCCESS);
3784   }
3785
3786
3787 /* If only a single queue run is requested, without SMTP listening, we can just
3788 turn into a queue runner, with an optional starting message id. */
3789
3790 if (queue_interval == 0 && !daemon_listen)
3791   {
3792   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3793     (start_queue_run_id == NULL)? US"" : US" starting at ",
3794     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3795     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
3796     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
3797   set_process_info("running the queue (single queue run)");
3798   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3799   exim_exit(EXIT_SUCCESS);
3800   }
3801
3802
3803 /* Find the login name of the real user running this process. This is always
3804 needed when receiving a message, because it is written into the spool file. It
3805 may also be used to construct a from: or a sender: header, and in this case we
3806 need the user's full name as well, so save a copy of it, checked for RFC822
3807 syntax and munged if necessary, if it hasn't previously been set by the -F
3808 argument. We may try to get the passwd entry more than once, in case NIS or
3809 other delays are in evidence. Save the home directory for use in filter testing
3810 (only). */
3811
3812 for (i = 0;;)
3813   {
3814   if ((pw = getpwuid(real_uid)) != NULL)
3815     {
3816     originator_login = string_copy(US pw->pw_name);
3817     originator_home = string_copy(US pw->pw_dir);
3818
3819     /* If user name has not been set by -F, set it from the passwd entry
3820     unless -f has been used to set the sender address by a trusted user. */
3821
3822     if (originator_name == NULL)
3823       {
3824       if (sender_address == NULL ||
3825            (!trusted_caller && filter_test == FTEST_NONE))
3826         {
3827         uschar *name = US pw->pw_gecos;
3828         uschar *amp = Ustrchr(name, '&');
3829         uschar buffer[256];
3830
3831         /* Most Unix specify that a '&' character in the gecos field is
3832         replaced by a copy of the login name, and some even specify that
3833         the first character should be upper cased, so that's what we do. */
3834
3835         if (amp != NULL)
3836           {
3837           int loffset;
3838           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3839             amp - name, name, &loffset, originator_login, amp + 1);
3840           buffer[loffset] = toupper(buffer[loffset]);
3841           name = buffer;
3842           }
3843
3844         /* If a pattern for matching the gecos field was supplied, apply
3845         it and then expand the name string. */
3846
3847         if (gecos_pattern != NULL && gecos_name != NULL)
3848           {
3849           const pcre *re;
3850           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3851
3852           if (regex_match_and_setup(re, name, 0, -1))
3853             {
3854             uschar *new_name = expand_string(gecos_name);
3855             expand_nmax = -1;
3856             if (new_name != NULL)
3857               {
3858               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3859                 "gecos field \"%s\"\n", new_name, name);
3860               name = new_name;
3861               }
3862             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3863               "\"%s\": %s\n", gecos_name, expand_string_message);
3864             }
3865           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3866             "gecos field \"%s\"\n", gecos_pattern, name);
3867           store_free((void *)re);
3868           }
3869         originator_name = string_copy(name);
3870         }
3871
3872       /* A trusted caller has used -f but not -F */
3873
3874       else originator_name = US"";
3875       }
3876
3877     /* Break the retry loop */
3878
3879     break;
3880     }
3881
3882   if (++i > finduser_retries) break;
3883   sleep(1);
3884   }
3885
3886 /* If we cannot get a user login, log the incident and give up, unless the
3887 configuration specifies something to use. When running in the test harness,
3888 any setting of unknown_login overrides the actual login name. */
3889
3890 if (originator_login == NULL || running_in_test_harness)
3891   {
3892   if (unknown_login != NULL)
3893     {
3894     originator_login = expand_string(unknown_login);
3895     if (originator_name == NULL && unknown_username != NULL)
3896       originator_name = expand_string(unknown_username);
3897     if (originator_name == NULL) originator_name = US"";
3898     }
3899   if (originator_login == NULL)
3900     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3901       (int)real_uid);
3902   }
3903
3904 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3905 RFC822 address.*/
3906
3907 originator_name = string_copy(parse_fix_phrase(originator_name,
3908   Ustrlen(originator_name), big_buffer, big_buffer_size));
3909
3910 /* If a message is created by this call of Exim, the uid/gid of its originator
3911 are those of the caller. These values are overridden if an existing message is
3912 read in from the spool. */
3913
3914 originator_uid = real_uid;
3915 originator_gid = real_gid;
3916
3917 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3918   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3919
3920 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3921 returns. We leave this till here so that the originator_ fields are available
3922 for incoming messages via the daemon. */
3923
3924 if (daemon_listen || queue_interval > 0)
3925   {
3926   if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3927     "run when mua_wrapper is set");
3928   daemon_go();
3929   }
3930
3931 /* If the sender ident has not been set (by a trusted caller) set it to
3932 the caller. This will get overwritten below for an inetd call. If a trusted
3933 caller has set it empty, unset it. */
3934
3935 if (sender_ident == NULL) sender_ident = originator_login;
3936   else if (sender_ident[0] == 0) sender_ident = NULL;
3937
3938 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3939 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3940 originator_* variables set. */
3941
3942 if (test_rewrite_arg >= 0)
3943   {
3944   really_exim = FALSE;
3945   if (test_rewrite_arg >= argc)
3946     {
3947     printf("-brw needs an address argument\n");
3948     exim_exit(EXIT_FAILURE);
3949     }
3950   rewrite_test(argv[test_rewrite_arg]);
3951   exim_exit(EXIT_SUCCESS);
3952   }
3953
3954 /* A locally-supplied message is considered to be coming from a local user
3955 unless a trusted caller supplies a sender address with -f, or is passing in the
3956 message via SMTP (inetd invocation or otherwise). */
3957
3958 if ((sender_address == NULL && !smtp_input) ||
3959     (!trusted_caller && filter_test == FTEST_NONE))
3960   {
3961   sender_local = TRUE;
3962
3963   /* A trusted caller can supply authenticated_sender and authenticated_id
3964   via -oMas and -oMai and if so, they will already be set. */
3965
3966   if (authenticated_sender == NULL)
3967     authenticated_sender = string_sprintf("%s@%s", originator_login,
3968       qualify_domain_sender);
3969   if (authenticated_id == NULL) authenticated_id = originator_login;
3970   }
3971
3972 /* Trusted callers are always permitted to specify the sender address.
3973 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3974 is specified is the empty address. However, if a trusted caller does not
3975 specify a sender address for SMTP input, we leave sender_address unset. This
3976 causes the MAIL commands to be honoured. */
3977
3978 if ((!smtp_input && sender_address == NULL) ||
3979     !receive_check_set_sender(sender_address))
3980   {
3981   /* Either the caller is not permitted to set a general sender, or this is
3982   non-SMTP input and the trusted caller has not set a sender. If there is no
3983   sender, or if a sender other than <> is set, override with the originator's
3984   login (which will get qualified below), except when checking things. */
3985
3986   if (sender_address == NULL             /* No sender_address set */
3987        ||                                /*         OR            */
3988        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
3989        !checking &&                      /* Not running tests, AND */
3990        filter_test == FTEST_NONE))       /* Not testing a filter */
3991     {
3992     sender_address = originator_login;
3993     sender_address_forced = FALSE;
3994     sender_address_domain = 0;
3995     }
3996   }
3997
3998 /* Remember whether an untrusted caller set the sender address */
3999
4000 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4001
4002 /* Ensure that the sender address is fully qualified unless it is the empty
4003 address, which indicates an error message, or doesn't exist (root caller, smtp
4004 interface, no -f argument). */
4005
4006 if (sender_address != NULL && sender_address[0] != 0 &&
4007     sender_address_domain == 0)
4008   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4009     qualify_domain_sender);
4010
4011 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4012
4013 /* Handle a request to verify a list of addresses, or test them for delivery.
4014 This must follow the setting of the sender address, since routers can be
4015 predicated upon the sender. If no arguments are given, read addresses from
4016 stdin. Set debug_level to at least D_v to get full output for address testing.
4017 */
4018
4019 if (verify_address_mode || address_test_mode)
4020   {
4021   int exit_value = 0;
4022   int flags = vopt_qualify;
4023
4024   if (verify_address_mode)
4025     {
4026     if (!verify_as_sender) flags |= vopt_is_recipient;
4027     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4028     }
4029
4030   else
4031     {
4032     flags |= vopt_is_recipient;
4033     debug_selector |= D_v;
4034     debug_file = stderr;
4035     debug_fd = fileno(debug_file);
4036     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4037     }
4038
4039   if (recipients_arg < argc)
4040     {
4041     while (recipients_arg < argc)
4042       {
4043       uschar *s = argv[recipients_arg++];
4044       while (*s != 0)
4045         {
4046         BOOL finished = FALSE;
4047         uschar *ss = parse_find_address_end(s, FALSE);
4048         if (*ss == ',') *ss = 0; else finished = TRUE;
4049         test_address(s, flags, &exit_value);
4050         s = ss;
4051         if (!finished)
4052           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4053         }
4054       }
4055     }
4056
4057   else for (;;)
4058     {
4059     uschar *s = get_stdinput(NULL, NULL);
4060     if (s == NULL) break;
4061     test_address(s, flags, &exit_value);
4062     }
4063
4064   route_tidyup();
4065   exim_exit(exit_value);
4066   }
4067
4068 /* Handle expansion checking */
4069
4070 if (expansion_test)
4071   {
4072   if (recipients_arg < argc)
4073     {
4074     while (recipients_arg < argc)
4075       {
4076       uschar *s = argv[recipients_arg++];
4077       uschar *ss = expand_string(s);
4078       if (ss == NULL)
4079         printf ("Failed: %s\n", expand_string_message);
4080       else printf("%s\n", CS ss);
4081       }
4082     }
4083
4084   /* Read stdin */
4085
4086   else
4087     {
4088     char *(*fn_readline)(char *) = NULL;
4089     char *(*fn_addhist)(char *) = NULL;
4090
4091     #ifdef USE_READLINE
4092     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4093     #endif
4094
4095     for (;;)
4096       {
4097       uschar *ss;
4098       uschar *source = get_stdinput(fn_readline, fn_addhist);
4099       if (source == NULL) break;
4100       ss = expand_string(source);
4101       if (ss == NULL)
4102         printf ("Failed: %s\n", expand_string_message);
4103       else printf("%s\n", CS ss);
4104       }
4105
4106     #ifdef USE_READLINE
4107     if (dlhandle != NULL) dlclose(dlhandle);
4108     #endif
4109     }
4110
4111   exim_exit(EXIT_SUCCESS);
4112   }
4113
4114
4115 /* The active host name is normally the primary host name, but it can be varied
4116 for hosts that want to play several parts at once. We need to ensure that it is
4117 set for host checking, and for receiving messages. */
4118
4119 smtp_active_hostname = primary_hostname;
4120 if (raw_active_hostname != NULL)
4121   {
4122   uschar *nah = expand_string(raw_active_hostname);
4123   if (nah == NULL)
4124     {
4125     if (!expand_string_forcedfail)
4126       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4127         "(smtp_active_hostname): %s", raw_active_hostname,
4128         expand_string_message);
4129     }
4130   else if (nah[0] != 0) smtp_active_hostname = nah;
4131   }
4132
4133 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4134 given IP address so that the blocking and relay configuration can be tested. An
4135 RFC 1413 call is made only if we are running in the test harness and an
4136 incoming interface and both ports are specified, because there is no TCP/IP
4137 call to find the ident for. */
4138
4139 if (host_checking)
4140   {
4141   int x[4];
4142   int size;
4143
4144   sender_ident = NULL;
4145   if (running_in_test_harness && sender_host_port != 0 &&
4146       interface_address != NULL && interface_port != 0)
4147     verify_get_ident(1413);
4148
4149   /* In case the given address is a non-canonical IPv6 address, canonicize
4150   it. The code works for both IPv4 and IPv6, as it happens. */
4151
4152   size = host_aton(sender_host_address, x);
4153   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4154   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4155
4156   /* Now set up for testing */
4157
4158   host_build_sender_fullhost();
4159   smtp_input = TRUE;
4160   smtp_in = stdin;
4161   smtp_out = stdout;
4162   sender_local = FALSE;
4163   sender_host_notsocket = TRUE;
4164   debug_file = stderr;
4165   debug_fd = fileno(debug_file);
4166   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4167     "**** but without any ident (RFC 1413) callback.\n"
4168     "**** This is not for real!\n\n",
4169       sender_host_address);
4170
4171   if (verify_check_host(&hosts_connection_nolog) == OK)
4172     log_write_selector &= ~L_smtp_connection;
4173   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4174
4175   if (smtp_start_session())
4176     {
4177     reset_point = store_get(0);
4178     for (;;)
4179       {
4180       store_reset(reset_point);
4181       if (smtp_setup_msg() <= 0) break;
4182       if (!receive_msg(FALSE)) break;
4183       }
4184     }
4185   exim_exit(EXIT_SUCCESS);
4186   }
4187
4188
4189 /* Arrange for message reception if recipients or SMTP were specified;
4190 otherwise complain unless a version print (-bV) happened or this is a filter
4191 verification test. In the former case, show the configuration file name. */
4192
4193 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4194   {
4195   if (version_printed)
4196     {
4197     printf("Configuration file is %s\n", config_main_filename);
4198     return EXIT_SUCCESS;
4199     }
4200   if (filter_test == FTEST_NONE)
4201     {
4202     fprintf(stderr,
4203 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4204 "not directly from a shell command line. Options and/or arguments control\n"
4205 "what it does when called. For a list of options, see the Exim documentation.\n");
4206     return EXIT_FAILURE;
4207     }
4208   }
4209
4210
4211 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4212 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4213 that we are not called from inetd, because that is rejected above. The
4214 following configuration settings are forced here:
4215
4216   (1) Synchronous delivery (-odi)
4217   (2) Errors to stderr (-oep == -oeq)
4218   (3) No parallel remote delivery
4219   (4) Unprivileged delivery
4220
4221 We don't force overall queueing options because there are several of them;
4222 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4223 to override any SMTP queueing. */
4224
4225 if (mua_wrapper)
4226   {
4227   synchronous_delivery = TRUE;
4228   arg_error_handling = ERRORS_STDERR;
4229   remote_max_parallel = 1;
4230   deliver_drop_privilege = TRUE;
4231   queue_smtp = FALSE;
4232   queue_smtp_domains = NULL;
4233   }
4234
4235
4236 /* Prepare to accept one or more new messages on the standard input. When a
4237 message has been read, its id is returned in message_id[]. If doing immediate
4238 delivery, we fork a delivery process for each received message, except for the
4239 last one, where we can save a process switch.
4240
4241 It is only in non-smtp mode that error_handling is allowed to be changed from
4242 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4243 sendmail error modes other than -oem ever actually used? Later: yes.) */
4244
4245 if (!smtp_input) error_handling = arg_error_handling;
4246
4247 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4248 logging being sent down the socket and make an identd call to get the
4249 sender_ident. */
4250
4251 else if (is_inetd)
4252   {
4253   fclose(stderr);
4254   exim_nullstd();                       /* Re-open to /dev/null */
4255   verify_get_ident(IDENT_PORT);
4256   host_build_sender_fullhost();
4257   set_process_info("handling incoming connection from %s via inetd",
4258     sender_fullhost);
4259   }
4260
4261 /* If the sender host address has been set, build sender_fullhost if it hasn't
4262 already been done (which it will have been for inetd). This caters for the
4263 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4264 so that the test for IP options is skipped for -bs input. */
4265
4266 if (sender_host_address != NULL && sender_fullhost == NULL)
4267   {
4268   host_build_sender_fullhost();
4269   set_process_info("handling incoming connection from %s via -oMa",
4270     sender_fullhost);
4271   sender_host_notsocket = TRUE;
4272   }
4273
4274 /* Otherwise, set the sender host as unknown except for inetd calls. This
4275 prevents host checking in the case of -bs not from inetd and also for -bS. */
4276
4277 else if (!is_inetd) sender_host_unknown = TRUE;
4278
4279 /* If stdout does not exist, then dup stdin to stdout. This can happen
4280 if exim is started from inetd. In this case fd 0 will be set to the socket,
4281 but fd 1 will not be set. This also happens for passed SMTP channels. */
4282
4283 if (fstat(1, &statbuf) < 0) dup2(0, 1);
4284
4285 /* Set up the incoming protocol name and the state of the program. Root
4286 is allowed to force received protocol via the -oMr option above, and if we are
4287 in a non-local SMTP state it means we have come via inetd and the process info
4288 has already been set up. We don't set received_protocol here for smtp input,
4289 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4290
4291 if (smtp_input)
4292   {
4293   if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4294     sender_address);
4295   }
4296 else
4297   {
4298   if (received_protocol == NULL)
4299     received_protocol = string_sprintf("local%s", called_as);
4300   set_process_info("accepting a local non-SMTP message from <%s>",
4301     sender_address);
4302   }
4303
4304 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4305 set) */
4306
4307 queue_check_only();
4308 local_queue_only = queue_only;
4309
4310 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4311 the spool if so configured. On failure, we must not attempt to send an error
4312 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4313 error code is given.) */
4314
4315 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4316   {
4317   fprintf(stderr, "exim: insufficient disk space\n");
4318   return EXIT_FAILURE;
4319   }
4320
4321 /* If this is smtp input of any kind, handle the start of the SMTP
4322 session. */
4323
4324 if (smtp_input)
4325   {
4326   smtp_in = stdin;
4327   smtp_out = stdout;
4328   if (verify_check_host(&hosts_connection_nolog) == OK)
4329     log_write_selector &= ~L_smtp_connection;
4330   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4331   if (!smtp_start_session())
4332     {
4333     mac_smtp_fflush();
4334     exim_exit(EXIT_SUCCESS);
4335     }
4336   }
4337
4338 /* Otherwise, set up the input size limit here */
4339
4340 else
4341   {
4342   thismessage_size_limit = expand_string_integer(message_size_limit);
4343   if (thismessage_size_limit < 0)
4344     {
4345     if (thismessage_size_limit == -1)
4346       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4347         "message_size_limit: %s", expand_string_message);
4348     else
4349       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4350         "message_size_limit: %s", expand_string_message);
4351     }
4352   }
4353
4354 /* Loop for several messages when reading SMTP input. If we fork any child
4355 processes, we don't want to wait for them unless synchronous delivery is
4356 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4357 same as SIG_DFL, despite the fact that documentation often lists the default as
4358 "ignore". This is a confusing area. This is what I know:
4359
4360 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4361 processes that complete simply to go away without ever becoming defunct. You
4362 can't then wait for them - but we don't want to wait for them in the
4363 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4364 happen for all OS (e.g. *BSD is different).
4365
4366 But that's not the end of the story. Some (many? all?) systems have the
4367 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4368 has by default, so it seems that the difference is merely one of default
4369 (compare restarting vs non-restarting signals).
4370
4371 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4372 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4373 of the loop below. Paranoia rules.
4374
4375 February 2003: That's *still* not the end of the story. There are now versions
4376 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4377 process then calls waitpid(), a grumble is written to the system log, because
4378 this is logically inconsistent. In other words, it doesn't like the paranoia.
4379 As a consequenc of this, the waitpid() below is now excluded if we are sure
4380 that SIG_IGN works. */
4381
4382 if (!synchronous_delivery)
4383   {
4384   #ifdef SA_NOCLDWAIT
4385   struct sigaction act;
4386   act.sa_handler = SIG_IGN;
4387   sigemptyset(&(act.sa_mask));
4388   act.sa_flags = SA_NOCLDWAIT;
4389   sigaction(SIGCHLD, &act, NULL);
4390   #else
4391   signal(SIGCHLD, SIG_IGN);
4392   #endif
4393   }
4394
4395 /* Save the current store pool point, for resetting at the start of
4396 each message, and save the real sender address, if any. */
4397
4398 reset_point = store_get(0);
4399 real_sender_address = sender_address;
4400
4401 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4402 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4403 collapsed). */
4404
4405 while (more)
4406   {
4407   store_reset(reset_point);
4408   message_id[0] = 0;
4409
4410   /* In the SMTP case, we have to handle the initial SMTP input and build the
4411   recipients list, before calling receive_msg() to read the message proper.
4412   Whatever sender address is actually given in the SMTP transaction is
4413   actually ignored for local senders - we use the actual sender, which is
4414   normally either the underlying user running this process or a -f argument
4415   provided by a trusted caller. It is saved in real_sender_address.
4416
4417   However, if this value is NULL, we are dealing with a trusted caller when
4418   -f was not used; in this case, the SMTP sender is allowed to stand.
4419
4420   Also, if untrusted_set_sender is set, we permit sender addresses that match
4421   anything in its list.
4422
4423   The variable raw_sender_address holds the sender address before rewriting. */
4424
4425   if (smtp_input)
4426     {
4427     int rc;
4428     if ((rc = smtp_setup_msg()) > 0)
4429       {
4430       if (real_sender_address != NULL &&
4431           !receive_check_set_sender(sender_address))
4432         {
4433         sender_address = raw_sender = real_sender_address;
4434         sender_address_unrewritten = NULL;
4435         }
4436       more = receive_msg(extract_recipients);
4437       if (message_id[0] == 0)
4438         {
4439         if (more) continue;
4440         exim_exit(EXIT_FAILURE);
4441         }
4442       }
4443     else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4444     }
4445
4446   /* In the non-SMTP case, we have all the information from the command
4447   line, but must process it in case it is in the more general RFC822
4448   format, and in any case, to detect syntax errors. Also, it appears that
4449   the use of comma-separated lists as single arguments is common, so we
4450   had better support them. */
4451
4452   else
4453     {
4454     int i;
4455     int rcount = 0;
4456     int count = argc - recipients_arg;
4457     uschar **list = argv + recipients_arg;
4458
4459     /* These options cannot be changed dynamically for non-SMTP messages */
4460
4461     active_local_sender_retain = local_sender_retain;
4462     active_local_from_check = local_from_check;
4463
4464     /* Save before any rewriting */
4465
4466     raw_sender = string_copy(sender_address);
4467
4468     /* Loop for each argument */
4469
4470     for (i = 0; i < count; i++)
4471       {
4472       int start, end, domain;
4473       uschar *errmess;
4474       uschar *s = list[i];
4475
4476       /* Loop for each comma-separated address */
4477
4478       while (*s != 0)
4479         {
4480         BOOL finished = FALSE;
4481         uschar *recipient;
4482         uschar *ss = parse_find_address_end(s, FALSE);
4483
4484         if (*ss == ',') *ss = 0; else finished = TRUE;
4485
4486         /* Check max recipients - if -t was used, these aren't recipients */
4487
4488         if (recipients_max > 0 && ++rcount > recipients_max &&
4489             !extract_recipients)
4490           {
4491           if (error_handling == ERRORS_STDERR)
4492             {
4493             fprintf(stderr, "exim: too many recipients\n");
4494             exim_exit(EXIT_FAILURE);
4495             }
4496           else
4497             {
4498             return
4499               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4500                 errors_sender_rc : EXIT_FAILURE;
4501             }
4502           }
4503
4504         recipient =
4505           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4506
4507         if (domain == 0 && !allow_unqualified_recipient)
4508           {
4509           recipient = NULL;
4510           errmess = US"unqualified recipient address not allowed";
4511           }
4512
4513         if (recipient == NULL)
4514           {
4515           if (error_handling == ERRORS_STDERR)
4516             {
4517             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4518               string_printing(list[i]), errmess);
4519             exim_exit(EXIT_FAILURE);
4520             }
4521           else
4522             {
4523             error_block eblock;
4524             eblock.next = NULL;
4525             eblock.text1 = string_printing(list[i]);
4526             eblock.text2 = errmess;
4527             return
4528               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4529                 errors_sender_rc : EXIT_FAILURE;
4530             }
4531           }
4532
4533         receive_add_recipient(recipient, -1);
4534         s = ss;
4535         if (!finished)
4536           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4537         }
4538       }
4539
4540     /* Show the recipients when debugging */
4541
4542     DEBUG(D_receive)
4543       {
4544       int i;
4545       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4546       if (recipients_list != NULL)
4547         {
4548         debug_printf("Recipients:\n");
4549         for (i = 0; i < recipients_count; i++)
4550           debug_printf("  %s\n", recipients_list[i].address);
4551         }
4552       }
4553
4554     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4555     will just read the headers for the message, and not write anything onto the
4556     spool. */
4557
4558     message_ended = END_NOTENDED;
4559     more = receive_msg(extract_recipients);
4560
4561     /* more is always FALSE here (not SMTP message) when reading a message
4562     for real; when reading the headers of a message for filter testing,
4563     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4564
4565     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4566     }  /* Non-SMTP message reception */
4567
4568   /* If this is a filter testing run, there are headers in store, but
4569   no message on the spool. Run the filtering code in testing mode, setting
4570   the domain to the qualify domain and the local part to the current user,
4571   unless they have been set by options. The prefix and suffix are left unset
4572   unless specified. The the return path is set to to the sender unless it has
4573   already been set from a return-path header in the message. */
4574
4575   if (filter_test != FTEST_NONE)
4576     {
4577     deliver_domain = (ftest_domain != NULL)?
4578       ftest_domain : qualify_domain_recipient;
4579     deliver_domain_orig = deliver_domain;
4580     deliver_localpart = (ftest_localpart != NULL)?
4581       ftest_localpart : originator_login;
4582     deliver_localpart_orig = deliver_localpart;
4583     deliver_localpart_prefix = ftest_prefix;
4584     deliver_localpart_suffix = ftest_suffix;
4585     deliver_home = originator_home;
4586
4587     if (return_path == NULL)
4588       {
4589       printf("Return-path copied from sender\n");
4590       return_path = string_copy(sender_address);
4591       }
4592     else
4593       {
4594       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4595       }
4596     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4597
4598     receive_add_recipient(
4599       string_sprintf("%s%s%s@%s",
4600         (ftest_prefix == NULL)? US"" : ftest_prefix,
4601         deliver_localpart,
4602         (ftest_suffix == NULL)? US"" : ftest_suffix,
4603         deliver_domain), -1);
4604
4605     printf("Recipient   = %s\n", recipients_list[0].address);
4606     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4607     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4608
4609     chdir("/");   /* Get away from wherever the user is running this from */
4610
4611     /* Now we run either a system filter test, or a user filter test, or both.
4612     In the latter case, headers added by the system filter will persist and be
4613     available to the user filter. We need to copy the filter variables
4614     explicitly. */
4615
4616     if ((filter_test & FTEST_SYSTEM) != 0)
4617       {
4618       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4619         exim_exit(EXIT_FAILURE);
4620       }
4621
4622     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4623
4624     if ((filter_test & FTEST_USER) != 0)
4625       {
4626       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4627         exim_exit(EXIT_FAILURE);
4628       }
4629
4630     exim_exit(EXIT_SUCCESS);
4631     }
4632
4633   /* Else act on the result of message reception. We should not get here unless
4634   message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4635   TRUE. If it is not, check on the number of messages received in this
4636   connection. If that's OK and queue_only_load is set, check that the load
4637   average is below it. If it is not, set local_queue_only TRUE. Note that it
4638   then remains this way for any subsequent messages on the same SMTP connection.
4639   This is a deliberate choice; even though the load average may fall, it
4640   doesn't seem right to deliver later messages on the same call when not
4641   delivering earlier ones. */
4642
4643   if (!local_queue_only)
4644     {
4645     if (smtp_accept_queue_per_connection > 0 &&
4646         receive_messagecount > smtp_accept_queue_per_connection)
4647       {
4648       local_queue_only = TRUE;
4649       queue_only_reason = 2;
4650       }
4651     else if (queue_only_load >= 0)
4652       {
4653       local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4654       if (local_queue_only) queue_only_reason = 3;
4655       }
4656     }
4657
4658   /* If running as an MUA wrapper, all queueing options and freezing options
4659   are ignored. */
4660
4661   if (mua_wrapper)
4662     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4663
4664   /* Log the queueing here, when it will get a message id attached, but
4665   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4666   connections). */
4667
4668   if (local_queue_only) switch(queue_only_reason)
4669     {
4670     case 2:
4671     log_write(L_delay_delivery,
4672               LOG_MAIN, "no immediate delivery: more than %d messages "
4673       "received in one connection", smtp_accept_queue_per_connection);
4674     break;
4675
4676     case 3:
4677     log_write(L_delay_delivery,
4678               LOG_MAIN, "no immediate delivery: load average %.2f",
4679               (double)load_average/1000.0);
4680     break;
4681     }
4682
4683   /* Else do the delivery unless the ACL or local_scan() called for queue only
4684   or froze the message. Always deliver in a separate process. A fork failure is
4685   not a disaster, as the delivery will eventually happen on a subsequent queue
4686   run. The search cache must be tidied before the fork, as the parent will
4687   do it before exiting. The child will trigger a lookup failure and
4688   thereby defer the delivery if it tries to use (for example) a cached ldap
4689   connection that the parent has called unbind on. */
4690
4691   else if (!queue_only_policy && !deliver_freeze)
4692     {
4693     pid_t pid;
4694     search_tidyup();
4695
4696     if ((pid = fork()) == 0)
4697       {
4698       int rc;
4699       close_unwanted();      /* Close unwanted file descriptors and TLS */
4700       exim_nullstd();        /* Ensure std{in,out,err} exist */
4701
4702       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4703       mode, deliver_drop_privilege is forced TRUE). */
4704
4705       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4706         {
4707         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4708           message_id);
4709         /* Control does not return here. */
4710         }
4711
4712       /* No need to re-exec */
4713
4714       rc = deliver_message(message_id, FALSE, FALSE);
4715       search_tidyup();
4716       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4717         EXIT_SUCCESS : EXIT_FAILURE);
4718       }
4719
4720     if (pid < 0)
4721       {
4722       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4723         "process: %s", strerror(errno));
4724       }
4725
4726     /* In the parent, wait if synchronous delivery is required. This will
4727     always be the case in MUA wrapper mode. */
4728
4729     else if (synchronous_delivery)
4730       {
4731       int status;
4732       while (wait(&status) != pid);
4733       if ((status & 0x00ff) != 0)
4734         log_write(0, LOG_MAIN|LOG_PANIC,
4735           "process %d crashed with signal %d while delivering %s",
4736           (int)pid, status & 0x00ff, message_id);
4737       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4738       }
4739     }
4740
4741   /* The loop will repeat if more is TRUE. If we do not know know that the OS
4742   automatically reaps children (see comments above the loop), clear away any
4743   finished subprocesses here, in case there are lots of messages coming in
4744   from the same source. */
4745
4746   #ifndef SIG_IGN_WORKS
4747   while (waitpid(-1, NULL, WNOHANG) > 0);
4748   #endif
4749   }
4750
4751 exim_exit(EXIT_SUCCESS);   /* Never returns */
4752 return 0;                  /* To stop compiler warning */
4753 }
4754
4755 /* End of exim.c */