src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.22 2005/06/28 10:23:35 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) (void)dup2(devnull, i);
 410     }
 411   }
 412 if (devnull > 2) (void)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   (void)close(fileno(smtp_in));
 463   (void)close(fileno(smtp_out));
 464   smtp_in = NULL;
 465   }
 466 else
 467   {
 468   (void)close(0);                                          /* stdin */
 469   if ((debug_selector & D_resolver) == 0) (void)close(1);  /* stdout */
 470   if (debug_selector == 0)                                 /* stderr */
 471     {
 472     if (!synchronous_delivery)
 473       {
 474       (void)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, and terminates it before the
 590 port data when a port is extracted.
 591
 592 Argument:
 593   address   the address, with possible port on the end
 594
 595 Returns:    the port, or zero if there isn't one
 596             bombs out on a syntax error
 597 */
 598
 599 static int
 600 check_port(uschar *address)
 601 {
 602 int port = host_extract_port(address);
 603 if (string_is_ip_address(address, NULL) == 0)
 604   {
 605   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 606   exit(EXIT_FAILURE);
 607   }
 608 return port;
 609 }
 610
 611
 612
 613 /*************************************************
 614 *              Test/verify an address            *
 615 *************************************************/
 616
 617 /* This function is called by the -bv and -bt code. It extracts a working
 618 address from a full RFC 822 address. This isn't really necessary per se, but it
 619 has the effect of collapsing source routes.
 620
 621 Arguments:
 622   s            the address string
 623   flags        flag bits for verify_address()
 624   exit_value   to be set for failures
 625
 626 Returns:       nothing
 627 */
 628
 629 static void
 630 test_address(uschar *s, int flags, int *exit_value)
 631 {
 632 int start, end, domain;
 633 uschar *parse_error = NULL;
 634 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 635   FALSE);
 636 if (address == NULL)
 637   {
 638   fprintf(stdout, "syntax error: %s\n", parse_error);
 639   *exit_value = 2;
 640   }
 641 else
 642   {
 643   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 644     -1, -1, NULL, NULL, NULL);
 645   if (rc == FAIL) *exit_value = 2;
 646     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 647   }
 648 }
 649
 650
 651
 652 /*************************************************
 653 *         Decode bit settings for log/debug      *
 654 *************************************************/
 655
 656 /* This function decodes a string containing bit settings in the form of +name
 657 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
 658 also recognizes a numeric setting of the form =<number>, but this is not
 659 intended for user use. It's an easy way for Exim to pass the debug settings
 660 when it is re-exec'ed.
 661
 662 The log options are held in two unsigned ints (because there became too many
 663 for one). The top bit in the table means "put in 2nd selector". This does not
 664 yet apply to debug options, so the "=" facility sets only the first selector.
 665
 666 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
 667 It sets all the bits in both selectors. However, there is a facility for then
 668 unsetting certain bits, because we want to turn off "memory" in the debug case.
 669
 670 A bad value for a debug setting is treated as an unknown option - error message
 671 to stderr and die. For log settings, which come from the configuration file,
 672 we write to the log on the way out...
 673
 674 Arguments:
 675   selector1      address of the first bit string
 676   selector2      address of the second bit string, or NULL
 677   notall1        bits to exclude from "all" for selector1
 678   notall2        bits to exclude from "all" for selector2
 679   string         the configured string
 680   options        the table of option names
 681   count          size of table
 682   which          "log" or "debug"
 683
 684 Returns:         nothing on success - bomb out on failure
 685 */
 686
 687 static void
 688 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
 689   int notall2, uschar *string, bit_table *options, int count, uschar *which)
 690 {
 691 uschar *errmsg;
 692 if (string == NULL) return;
 693
 694 if (*string == '=')
 695   {
 696   char *end;    /* Not uschar */
 697   *selector1 = strtoul(CS string+1, &end, 0);
 698   if (*end == 0) return;
 699   errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
 700     string);
 701   goto ERROR_RETURN;
 702   }
 703
 704 /* Handle symbolic setting */
 705
 706 else for(;;)
 707   {
 708   BOOL adding;
 709   uschar *s;
 710   int len;
 711   bit_table *start, *end;
 712
 713   while (isspace(*string)) string++;
 714   if (*string == 0) return;
 715
 716   if (*string != '+' && *string != '-')
 717     {
 718     errmsg = string_sprintf("malformed %s_selector setting: "
 719       "+ or - expected but found \"%s\"", which, string);
 720     goto ERROR_RETURN;
 721     }
 722
 723   adding = *string++ == '+';
 724   s = string;
 725   while (isalnum(*string) || *string == '_') string++;
 726   len = string - s;
 727
 728   start = options;
 729   end = options + count;
 730
 731   while (start < end)
 732     {
 733     bit_table *middle = start + (end - start)/2;
 734     int c = Ustrncmp(s, middle->name, len);
 735     if (c == 0)
 736       {
 737       if (middle->name[len] != 0) c = -1; else
 738         {
 739         unsigned int bit = middle->bit;
 740         unsigned int *selector;
 741
 742         /* The value with all bits set means "force all bits in both selectors"
 743         in the case where two are being handled. However, the top bit in the
 744         second selector is never set. When setting, some bits can be excluded.
 745         */
 746
 747         if (bit == 0xffffffff)
 748           {
 749           if (adding)
 750             {
 751             *selector1 = 0xffffffff ^ notall1;
 752             if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
 753             }
 754           else
 755             {
 756             *selector1 = 0;
 757             if (selector2 != NULL) *selector2 = 0;
 758             }
 759           }
 760
 761         /* Otherwise, the 0x80000000 bit means "this value, without the top
 762         bit, belongs in the second selector". */
 763
 764         else
 765           {
 766           if ((bit & 0x80000000) != 0)
 767             {
 768             selector = selector2;
 769             bit &= 0x7fffffff;
 770             }
 771           else selector = selector1;
 772           if (adding) *selector |= bit; else *selector &= ~bit;
 773           }
 774         break;  /* Out of loop to match selector name */
 775         }
 776       }
 777     if (c < 0) end = middle; else start = middle + 1;
 778     }  /* Loop to match selector name */
 779
 780   if (start >= end)
 781     {
 782     errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
 783       adding? '+' : '-', len, s);
 784     goto ERROR_RETURN;
 785     }
 786   }    /* Loop for selector names */
 787
 788 /* Handle disasters */
 789
 790 ERROR_RETURN:
 791 if (Ustrcmp(which, "debug") == 0)
 792   {
 793   fprintf(stderr, "exim: %s\n", errmsg);
 794   exit(EXIT_FAILURE);
 795   }
 796 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
 797 }
 798
 799
 800
 801 /*************************************************
 802 *          Show supported features               *
 803 *************************************************/
 804
 805 /* This function is called for -bV and for -d to output the optional features
 806 of the current Exim binary.
 807
 808 Arguments:  a FILE for printing
 809 Returns:    nothing
 810 */
 811
 812 static void
 813 show_whats_supported(FILE *f)
 814 {
 815 #ifdef DB_VERSION_STRING
 816 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 817 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 818   #ifdef USE_DB
 819   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 820   #else
 821   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 822   #endif
 823 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 824 fprintf(f, "Probably ndbm\n");
 825 #elif defined(USE_TDB)
 826 fprintf(f, "Using tdb\n");
 827 #else
 828   #ifdef USE_GDBM
 829   fprintf(f, "Probably GDBM (native mode)\n");
 830   #else
 831   fprintf(f, "Probably GDBM (compatibility mode)\n");
 832   #endif
 833 #endif
 834
 835 fprintf(f, "Support for:");
 836 #if HAVE_ICONV
 837   fprintf(f, " iconv()");
 838 #endif
 839 #if HAVE_IPV6
 840   fprintf(f, " IPv6");
 841 #endif
 842 #ifdef SUPPORT_PAM
 843   fprintf(f, " PAM");
 844 #endif
 845 #ifdef EXIM_PERL
 846   fprintf(f, " Perl");
 847 #endif
 848 #ifdef EXPAND_DLFUNC
 849   fprintf(f, " Expand_dlfunc");
 850 #endif
 851 #ifdef USE_TCP_WRAPPERS
 852   fprintf(f, " TCPwrappers");
 853 #endif
 854 #ifdef SUPPORT_TLS
 855   #ifdef USE_GNUTLS
 856   fprintf(f, " GnuTLS");
 857   #else
 858   fprintf(f, " OpenSSL");
 859   #endif
 860 #endif
 861 #ifdef WITH_CONTENT_SCAN
 862   fprintf(f, " Content_Scanning");
 863 #endif
 864 #ifdef WITH_OLD_DEMIME
 865   fprintf(f, " Old_Demime");
 866 #endif
 867 #ifdef EXPERIMENTAL_SPF
 868   fprintf(f, " Experimental_SPF");
 869 #endif
 870 #ifdef EXPERIMENTAL_SRS
 871   fprintf(f, " Experimental_SRS");
 872 #endif
 873 #ifdef EXPERIMENTAL_BRIGHTMAIL
 874   fprintf(f, " Experimental_Brightmail");
 875 #endif
 876 #ifdef EXPERIMENTAL_DOMAINKEYS
 877   fprintf(f, " Experimental_DomainKeys");
 878 #endif
 879 fprintf(f, "\n");
 880
 881 fprintf(f, "Lookups:");
 882 #ifdef LOOKUP_LSEARCH
 883   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 884 #endif
 885 #ifdef LOOKUP_CDB
 886   fprintf(f, " cdb");
 887 #endif
 888 #ifdef LOOKUP_DBM
 889   fprintf(f, " dbm dbmnz");
 890 #endif
 891 #ifdef LOOKUP_DNSDB
 892   fprintf(f, " dnsdb");
 893 #endif
 894 #ifdef LOOKUP_DSEARCH
 895   fprintf(f, " dsearch");
 896 #endif
 897 #ifdef LOOKUP_IBASE
 898   fprintf(f, " ibase");
 899 #endif
 900 #ifdef LOOKUP_LDAP
 901   fprintf(f, " ldap ldapdn ldapm");
 902 #endif
 903 #ifdef LOOKUP_MYSQL
 904   fprintf(f, " mysql");
 905 #endif
 906 #ifdef LOOKUP_NIS
 907   fprintf(f, " nis nis0");
 908 #endif
 909 #ifdef LOOKUP_NISPLUS
 910   fprintf(f, " nisplus");
 911 #endif
 912 #ifdef LOOKUP_ORACLE
 913   fprintf(f, " oracle");
 914 #endif
 915 #ifdef LOOKUP_PASSWD
 916   fprintf(f, " passwd");
 917 #endif
 918 #ifdef LOOKUP_PGSQL
 919   fprintf(f, " pgsql");
 920 #endif
 921 #ifdef LOOKUP_TESTDB
 922   fprintf(f, " testdb");
 923 #endif
 924 #ifdef LOOKUP_WHOSON
 925   fprintf(f, " whoson");
 926 #endif
 927 fprintf(f, "\n");
 928
 929 fprintf(f, "Authenticators:");
 930 #ifdef AUTH_CRAM_MD5
 931   fprintf(f, " cram_md5");
 932 #endif
 933 #ifdef AUTH_CYRUS_SASL
 934   fprintf(f, " cyrus_sasl");
 935 #endif
 936 #ifdef AUTH_PLAINTEXT
 937   fprintf(f, " plaintext");
 938 #endif
 939 #ifdef AUTH_SPA
 940   fprintf(f, " spa");
 941 #endif
 942 fprintf(f, "\n");
 943
 944 fprintf(f, "Routers:");
 945 #ifdef ROUTER_ACCEPT
 946   fprintf(f, " accept");
 947 #endif
 948 #ifdef ROUTER_DNSLOOKUP
 949   fprintf(f, " dnslookup");
 950 #endif
 951 #ifdef ROUTER_IPLITERAL
 952   fprintf(f, " ipliteral");
 953 #endif
 954 #ifdef ROUTER_IPLOOKUP
 955   fprintf(f, " iplookup");
 956 #endif
 957 #ifdef ROUTER_MANUALROUTE
 958   fprintf(f, " manualroute");
 959 #endif
 960 #ifdef ROUTER_QUERYPROGRAM
 961   fprintf(f, " queryprogram");
 962 #endif
 963 #ifdef ROUTER_REDIRECT
 964   fprintf(f, " redirect");
 965 #endif
 966 fprintf(f, "\n");
 967
 968 fprintf(f, "Transports:");
 969 #ifdef TRANSPORT_APPENDFILE
 970   fprintf(f, " appendfile");
 971   #ifdef SUPPORT_MAILDIR
 972     fprintf(f, "/maildir");
 973   #endif
 974   #ifdef SUPPORT_MAILSTORE
 975     fprintf(f, "/mailstore");
 976   #endif
 977   #ifdef SUPPORT_MBX
 978     fprintf(f, "/mbx");
 979   #endif
 980 #endif
 981 #ifdef TRANSPORT_AUTOREPLY
 982   fprintf(f, " autoreply");
 983 #endif
 984 #ifdef TRANSPORT_LMTP
 985   fprintf(f, " lmtp");
 986 #endif
 987 #ifdef TRANSPORT_PIPE
 988   fprintf(f, " pipe");
 989 #endif
 990 #ifdef TRANSPORT_SMTP
 991   fprintf(f, " smtp");
 992 #endif
 993 fprintf(f, "\n");
 994
 995 if (fixed_never_users[0] > 0)
 996   {
 997   int i;
 998   fprintf(f, "Fixed never_users: ");
 999   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1000     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1001   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1002   }
1003 }
1004
1005
1006
1007
1008 /*************************************************
1009 *               Quote a local part               *
1010 *************************************************/
1011
1012 /* This function is used when a sender address or a From: or Sender: header
1013 line is being created from the caller's login, or from an authenticated_id. It
1014 applies appropriate quoting rules for a local part.
1015
1016 Argument:    the local part
1017 Returns:     the local part, quoted if necessary
1018 */
1019
1020 uschar *
1021 local_part_quote(uschar *lpart)
1022 {
1023 BOOL needs_quote = FALSE;
1024 int size, ptr;
1025 uschar *yield;
1026 uschar *t;
1027
1028 for (t = lpart; !needs_quote && *t != 0; t++)
1029   {
1030   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1031     (*t != '.' || t == lpart || t[1] == 0);
1032   }
1033
1034 if (!needs_quote) return lpart;
1035
1036 size = ptr = 0;
1037 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1038
1039 for (;;)
1040   {
1041   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1042   if (nq == NULL)
1043     {
1044     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1045     break;
1046     }
1047   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1048   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1049   yield = string_cat(yield, &size, &ptr, nq, 1);
1050   lpart = nq + 1;
1051   }
1052
1053 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1054 yield[ptr] = 0;
1055 return yield;
1056 }
1057
1058
1059
1060 #ifdef USE_READLINE
1061 /*************************************************
1062 *         Load readline() functions              *
1063 *************************************************/
1064
1065 /* This function is called from testing executions that read data from stdin,
1066 but only when running as the calling user. Currently, only -be does this. The
1067 function loads the readline() function library and passes back the functions.
1068 On some systems, it needs the curses library, so load that too, but try without
1069 it if loading fails. All this functionality has to be requested at build time.
1070
1071 Arguments:
1072   fn_readline_ptr   pointer to where to put the readline pointer
1073   fn_addhist_ptr    pointer to where to put the addhistory function
1074
1075 Returns:            the dlopen handle or NULL on failure
1076 */
1077
1078 static void *
1079 set_readline(char * (**fn_readline_ptr)(char *),
1080              char * (**fn_addhist_ptr)(char *))
1081 {
1082 void *dlhandle;
1083 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1084
1085 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1086 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1087
1088 if (dlhandle != NULL)
1089   {
1090   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1091   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1092   }
1093 else
1094   {
1095   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1096   }
1097
1098 return dlhandle;
1099 }
1100 #endif
1101
1102
1103
1104 /*************************************************
1105 *    Get a line from stdin for testing things    *
1106 *************************************************/
1107
1108 /* This function is called when running tests that can take a number of lines
1109 of input (for example, -be and -bt). It handles continuations and trailing
1110 spaces. And prompting and a blank line output on eof. If readline() is in use,
1111 the arguments are non-NULL and provide the relevant functions.
1112
1113 Arguments:
1114   fn_readline   readline function or NULL
1115   fn_addhist    addhist function or NULL
1116
1117 Returns:        pointer to dynamic memory, or NULL at end of file
1118 */
1119
1120 static uschar *
1121 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1122 {
1123 int i;
1124 int size = 0;
1125 int ptr = 0;
1126 uschar *yield = NULL;
1127
1128 if (fn_readline == NULL) printf("> ");
1129
1130 for (i = 0;; i++)
1131   {
1132   uschar buffer[1024];
1133   uschar *p, *ss;
1134
1135   #ifdef USE_READLINE
1136   char *readline_line = NULL;
1137   if (fn_readline != NULL)
1138     {
1139     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1140     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1141     p = US readline_line;
1142     }
1143   else
1144   #endif
1145
1146   /* readline() not in use */
1147
1148     {
1149     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1150     p = buffer;
1151     }
1152
1153   /* Handle the line */
1154
1155   ss = p + (int)Ustrlen(p);
1156   while (ss > p && isspace(ss[-1])) ss--;
1157
1158   if (i > 0)
1159     {
1160     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1161     }
1162
1163   yield = string_cat(yield, &size, &ptr, p, ss - p);
1164
1165   #ifdef USE_READLINE
1166   if (fn_readline != NULL) free(readline_line);
1167   #endif
1168
1169   if (ss == p || yield[ptr-1] != '\\')
1170     {
1171     yield[ptr] = 0;
1172     break;
1173     }
1174   yield[--ptr] = 0;
1175   }
1176
1177 if (yield == NULL) printf("\n");
1178 return yield;
1179 }
1180
1181
1182
1183 /*************************************************
1184 *          Entry point and high-level code       *
1185 *************************************************/
1186
1187 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1188 the appropriate action. All the necessary functions are present in the one
1189 binary. I originally thought one should split it up, but it turns out that so
1190 much of the apparatus is needed in each chunk that one might as well just have
1191 it all available all the time, which then makes the coding easier as well.
1192
1193 Arguments:
1194   argc      count of entries in argv
1195   argv      argument strings, with argv[0] being the program name
1196
1197 Returns:    EXIT_SUCCESS if terminated successfully
1198             EXIT_FAILURE otherwise, except when a message has been sent
1199               to the sender, and -oee was given
1200 */
1201
1202 int
1203 main(int argc, char **cargv)
1204 {
1205 uschar **argv = USS cargv;
1206 int  arg_receive_timeout = -1;
1207 int  arg_smtp_receive_timeout = -1;
1208 int  arg_error_handling = error_handling;
1209 int  filter_sfd = -1;
1210 int  filter_ufd = -1;
1211 int  group_count;
1212 int  i;
1213 int  list_queue_option = 0;
1214 int  msg_action = 0;
1215 int  msg_action_arg = -1;
1216 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1217 int  queue_only_reason = 0;
1218 #ifdef EXIM_PERL
1219 int  perl_start_option = 0;
1220 #endif
1221 int  recipients_arg = argc;
1222 int  sender_address_domain = 0;
1223 int  test_retry_arg = -1;
1224 int  test_rewrite_arg = -1;
1225 BOOL arg_queue_only = FALSE;
1226 BOOL bi_option = FALSE;
1227 BOOL checking = FALSE;
1228 BOOL count_queue = FALSE;
1229 BOOL expansion_test = FALSE;
1230 BOOL extract_recipients = FALSE;
1231 BOOL forced_delivery = FALSE;
1232 BOOL f_end_dot = FALSE;
1233 BOOL deliver_give_up = FALSE;
1234 BOOL list_queue = FALSE;
1235 BOOL list_options = FALSE;
1236 BOOL local_queue_only;
1237 BOOL more = TRUE;
1238 BOOL one_msg_action = FALSE;
1239 BOOL queue_only_set = FALSE;
1240 BOOL receiving_message = TRUE;
1241 BOOL unprivileged;
1242 BOOL removed_privilege = FALSE;
1243 BOOL verify_address_mode = FALSE;
1244 BOOL verify_as_sender = FALSE;
1245 BOOL version_printed = FALSE;
1246 uschar *alias_arg = NULL;
1247 uschar *called_as = US"";
1248 uschar *start_queue_run_id = NULL;
1249 uschar *stop_queue_run_id = NULL;
1250 uschar *ftest_domain = NULL;
1251 uschar *ftest_localpart = NULL;
1252 uschar *ftest_prefix = NULL;
1253 uschar *ftest_suffix = NULL;
1254 uschar *real_sender_address;
1255 uschar *originator_home = US"/";
1256 void *reset_point;
1257
1258 struct passwd *pw;
1259 struct stat statbuf;
1260 pid_t passed_qr_pid = (pid_t)0;
1261 int passed_qr_pipe = -1;
1262 gid_t group_list[NGROUPS_MAX];
1263
1264 /* Possible options for -R and -S */
1265
1266 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1267
1268 /* Need to define this in case we need to change the environment in order
1269 to get rid of a bogus time zone. We have to make it char rather than uschar
1270 because some OS define it in /usr/include/unistd.h. */
1271
1272 extern char **environ;
1273
1274 /* If the Exim user and/or group and/or the configuration file owner/group were
1275 defined by ref:name at build time, we must now find the actual uid/gid values.
1276 This is a feature to make the lives of binary distributors easier. */
1277
1278 #ifdef EXIM_USERNAME
1279 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1280   {
1281   exim_gid = pw->pw_gid;
1282   }
1283 else
1284   {
1285   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1286     EXIM_USERNAME);
1287   exit(EXIT_FAILURE);
1288   }
1289 #endif
1290
1291 #ifdef EXIM_GROUPNAME
1292 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1293   {
1294   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1295     EXIM_GROUPNAME);
1296   exit(EXIT_FAILURE);
1297   }
1298 #endif
1299
1300 #ifdef CONFIGURE_OWNERNAME
1301 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1302   {
1303   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1304     CONFIGURE_OWNERNAME);
1305   exit(EXIT_FAILURE);
1306   }
1307 #endif
1308
1309 #ifdef CONFIGURE_GROUPNAME
1310 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1311   {
1312   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1313     CONFIGURE_GROUPNAME);
1314   exit(EXIT_FAILURE);
1315   }
1316 #endif
1317
1318 /* In the Cygwin environment, some initialization needs doing. It is fudged
1319 in by means of this macro. */
1320
1321 #ifdef OS_INIT
1322 OS_INIT
1323 #endif
1324
1325 /* Check a field which is patched when we are running Exim within its
1326 testing harness; do a fast initial check, and then the whole thing. */
1327
1328 running_in_test_harness =
1329   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1330
1331 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1332 at the start of a program; however, it seems that some environments do not
1333 follow this. A "strange" locale can affect the formatting of timestamps, so we
1334 make quite sure. */
1335
1336 setlocale(LC_ALL, "C");
1337
1338 /* Set up the default handler for timing using alarm(). */
1339
1340 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1341
1342 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1343 because store_malloc writes a log entry on failure. */
1344
1345 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1346 if (log_buffer == NULL)
1347   {
1348   fprintf(stderr, "exim: failed to get store for log buffer\n");
1349   exit(EXIT_FAILURE);
1350   }
1351
1352 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1353 NULL when the daemon is run and the file is closed. We have to use this
1354 indirection, because some systems don't allow writing to the variable "stderr".
1355 */
1356
1357 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1358
1359 /* Arrange for the PCRE regex library to use our store functions. Note that
1360 the normal calls are actually macros that add additional arguments for
1361 debugging purposes so we have to assign specially constructed functions here.
1362 The default is to use store in the stacking pool, but this is overridden in the
1363 regex_must_compile() function. */
1364
1365 pcre_malloc = function_store_get;
1366 pcre_free = function_dummy_free;
1367
1368 /* Ensure there is a big buffer for temporary use in several places. It is put
1369 in malloc store so that it can be freed for enlargement if necessary. */
1370
1371 big_buffer = store_malloc(big_buffer_size);
1372
1373 /* Set up the handler for the data request signal, and set the initial
1374 descriptive text. */
1375
1376 set_process_info("initializing");
1377 os_restarting_signal(SIGUSR1, usr1_handler);
1378
1379 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1380 in the daemon code. For the rest of Exim's uses, we ignore it. */
1381
1382 signal(SIGHUP, SIG_IGN);
1383
1384 /* We don't want to die on pipe errors as the code is written to handle
1385 the write error instead. */
1386
1387 signal(SIGPIPE, SIG_IGN);
1388
1389 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1390 set to SIG_IGN. This causes subprocesses that complete before the parent
1391 process waits for them not to hang around, so when Exim calls wait(), nothing
1392 is there. The wait() code has been made robust against this, but let's ensure
1393 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1394 ending status. We use sigaction rather than plain signal() on those OS where
1395 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1396 problem on AIX with this.) */
1397
1398 #ifdef SA_NOCLDWAIT
1399   {
1400   struct sigaction act;
1401   act.sa_handler = SIG_DFL;
1402   sigemptyset(&(act.sa_mask));
1403   act.sa_flags = 0;
1404   sigaction(SIGCHLD, &act, NULL);
1405   }
1406 #else
1407 signal(SIGCHLD, SIG_DFL);
1408 #endif
1409
1410 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1411 SIGHUP. */
1412
1413 sighup_argv = argv;
1414
1415 /* Set up the version number. Set up the leading 'E' for the external form of
1416 message ids, set the pointer to the internal form, and initialize it to
1417 indicate no message being processed. */
1418
1419 version_init();
1420 message_id_option[0] = '-';
1421 message_id_external = message_id_option + 1;
1422 message_id_external[0] = 'E';
1423 message_id = message_id_external + 1;
1424 message_id[0] = 0;
1425
1426 /* Set the umask to zero so that any files that Exim creates are created
1427 with the modes that it specifies. */
1428
1429 umask(0);
1430
1431 /* Precompile the regular expression for matching a message id. Keep this in
1432 step with the code that generates ids in the accept.c module. We need to do
1433 this here, because the -M options check their arguments for syntactic validity
1434 using mac_ismsgid, which uses this. */
1435
1436 regex_ismsgid =
1437   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1438
1439 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1440 this seems to be a generally accepted convention, since one finds symbolic
1441 links called "mailq" in standard OS configurations. */
1442
1443 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1444     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1445   {
1446   list_queue = TRUE;
1447   receiving_message = FALSE;
1448   called_as = US"-mailq";
1449   }
1450
1451 /* If the program is called as "rmail" treat it as equivalent to
1452 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1453 i.e. preventing a single dot on a line from terminating the message, and
1454 returning with zero return code, even in cases of error (provided an error
1455 message has been sent). */
1456
1457 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1458     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1459   {
1460   dot_ends = FALSE;
1461   called_as = US"-rmail";
1462   errors_sender_rc = EXIT_SUCCESS;
1463   }
1464
1465 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1466 this is a smail convention. */
1467
1468 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1469     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1470   {
1471   smtp_input = smtp_batched_input = TRUE;
1472   called_as = US"-rsmtp";
1473   }
1474
1475 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1476 this is a smail convention. */
1477
1478 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1479     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1480   {
1481   queue_interval = 0;
1482   receiving_message = FALSE;
1483   called_as = US"-runq";
1484   }
1485
1486 /* If the program is called as "newaliases" treat it as equivalent to
1487 "exim -bi"; this is a sendmail convention. */
1488
1489 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1490     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1491   {
1492   bi_option = TRUE;
1493   receiving_message = FALSE;
1494   called_as = US"-newaliases";
1495   }
1496
1497 /* Save the original effective uid for a couple of uses later. It should
1498 normally be root, but in some esoteric environments it may not be. */
1499
1500 original_euid = geteuid();
1501
1502 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1503 to be the same as the real ones. This makes a difference only if Exim is setuid
1504 (or setgid) to something other than root, which could be the case in some
1505 special configurations. */
1506
1507 real_uid = getuid();
1508 real_gid = getgid();
1509
1510 if (real_uid == root_uid)
1511   {
1512   setgid(real_gid);
1513   setuid(real_uid);
1514   }
1515
1516 /* If neither the original real uid nor the original euid was root, Exim is
1517 running in an unprivileged state. */
1518
1519 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1520
1521 /* If the first argument is --help, pretend there are no arguments. This will
1522 cause a brief message to be given. */
1523
1524 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1525
1526 /* Scan the program's arguments. Some can be dealt with right away; others are
1527 simply recorded for checking and handling afterwards. Do a high-level switch
1528 on the second character (the one after '-'), to save some effort. */
1529
1530 for (i = 1; i < argc; i++)
1531   {
1532   BOOL badarg = FALSE;
1533   uschar *arg = argv[i];
1534   uschar *argrest;
1535   int switchchar;
1536
1537   /* An argument not starting with '-' is the start of a recipients list;
1538   break out of the options-scanning loop. */
1539
1540   if (arg[0] != '-')
1541     {
1542     recipients_arg = i;
1543     break;
1544     }
1545
1546   /* An option consistion of -- terminates the options */
1547
1548   if (Ustrcmp(arg, "--") == 0)
1549     {
1550     recipients_arg = i + 1;
1551     break;
1552     }
1553
1554   /* Handle flagged options */
1555
1556   switchchar = arg[1];
1557   argrest = arg+2;
1558
1559   /* Make all -ex options synonymous with -oex arguments, since that
1560   is assumed by various callers. Also make -qR options synonymous with -R
1561   options, as that seems to be required as well. Allow for -qqR too, and
1562   the same for -S options. */
1563
1564   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1565       Ustrncmp(arg+1, "qR", 2) == 0 ||
1566       Ustrncmp(arg+1, "qS", 2) == 0)
1567     {
1568     switchchar = arg[2];
1569     argrest++;
1570     }
1571   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1572     {
1573     switchchar = arg[3];
1574     argrest += 2;
1575     queue_2stage = TRUE;
1576     }
1577
1578   /* Make -r synonymous with -f, since it is a documented alias */
1579
1580   else if (arg[1] == 'r') switchchar = 'f';
1581
1582   /* Make -ov synonymous with -v */
1583
1584   else if (Ustrcmp(arg, "-ov") == 0)
1585     {
1586     switchchar = 'v';
1587     argrest++;
1588     }
1589
1590   /* High-level switch on active initial letter */
1591
1592   switch(switchchar)
1593     {
1594     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1595     so has no need of it. */
1596
1597     case 'B':
1598     if (*argrest == 0) i++;       /* Skip over the type */
1599     break;
1600
1601
1602     case 'b':
1603     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1604
1605     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1606        -bdf: Ditto, but in the foreground.
1607     */
1608
1609     if (*argrest == 'd')
1610       {
1611       daemon_listen = TRUE;
1612       if (*(++argrest) == 'f') background_daemon = FALSE;
1613         else if (*argrest != 0) { badarg = TRUE; break; }
1614       }
1615
1616     /* -be: Run in expansion test mode */
1617
1618     else if (*argrest == 'e')
1619       expansion_test = checking = TRUE;
1620
1621     /* -bF:  Run system filter test */
1622
1623     else if (*argrest == 'F')
1624       {
1625       filter_test |= FTEST_SYSTEM;
1626       if (*(++argrest) != 0) { badarg = TRUE; break; }
1627       if (++i < argc) filter_test_sfile = argv[i]; else
1628         {
1629         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1630         exit(EXIT_FAILURE);
1631         }
1632       }
1633
1634     /* -bf:  Run user filter test
1635        -bfd: Set domain for filter testing
1636        -bfl: Set local part for filter testing
1637        -bfp: Set prefix for filter testing
1638        -bfs: Set suffix for filter testing
1639     */
1640
1641     else if (*argrest == 'f')
1642       {
1643       if (*(++argrest) == 0)
1644         {
1645         filter_test |= FTEST_USER;
1646         if (++i < argc) filter_test_ufile = argv[i]; else
1647           {
1648           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1649           exit(EXIT_FAILURE);
1650           }
1651         }
1652       else
1653         {
1654         if (++i >= argc)
1655           {
1656           fprintf(stderr, "exim: string expected after %s\n", arg);
1657           exit(EXIT_FAILURE);
1658           }
1659         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1660         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1661         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1662         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1663         else { badarg = TRUE; break; }
1664         }
1665       }
1666
1667     /* -bh: Host checking - an IP address must follow. */
1668
1669     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1670       {
1671       if (++i >= argc) { badarg = TRUE; break; }
1672       sender_host_address = argv[i];
1673       host_checking = checking = log_testing_mode = TRUE;
1674       host_checking_callout = argrest[1] == 'c';
1675       }
1676
1677     /* -bi: This option is used by sendmail to initialize *the* alias file,
1678     though it has the -oA option to specify a different file. Exim has no
1679     concept of *the* alias file, but since Sun's YP make script calls
1680     sendmail this way, some support must be provided. */
1681
1682     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1683
1684     /* -bm: Accept and deliver message - the default option. Reinstate
1685     receiving_message, which got turned off for all -b options. */
1686
1687     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1688
1689     /* -bnq: For locally originating messages, do not qualify unqualified
1690     addresses. In the envelope, this causes errors; in header lines they
1691     just get left. */
1692
1693     else if (Ustrcmp(argrest, "nq") == 0)
1694       {
1695       allow_unqualified_sender = FALSE;
1696       allow_unqualified_recipient = FALSE;
1697       }
1698
1699     /* -bpxx: List the contents of the mail queue, in various forms. If
1700     the option is -bpc, just a queue count is needed. Otherwise, if the
1701     first letter after p is r, then order is random. */
1702
1703     else if (*argrest == 'p')
1704       {
1705       if (*(++argrest) == 'c')
1706         {
1707         count_queue = TRUE;
1708         if (*(++argrest) != 0) badarg = TRUE;
1709         break;
1710         }
1711
1712       if (*argrest == 'r')
1713         {
1714         list_queue_option = 8;
1715         argrest++;
1716         }
1717       else list_queue_option = 0;
1718
1719       list_queue = TRUE;
1720
1721       /* -bp: List the contents of the mail queue, top-level only */
1722
1723       if (*argrest == 0) {}
1724
1725       /* -bpu: List the contents of the mail queue, top-level undelivered */
1726
1727       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1728
1729       /* -bpa: List the contents of the mail queue, including all delivered */
1730
1731       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1732
1733       /* Unknown after -bp[r] */
1734
1735       else
1736         {
1737         badarg = TRUE;
1738         break;
1739         }
1740       }
1741
1742
1743     /* -bP: List the configuration variables given as the address list.
1744     Force -v, so configuration errors get displayed. */
1745
1746     else if (Ustrcmp(argrest, "P") == 0)
1747       {
1748       list_options = TRUE;
1749       debug_selector |= D_v;
1750       debug_file = stderr;
1751       }
1752
1753     /* -brt: Test retry configuration lookup */
1754
1755     else if (Ustrcmp(argrest, "rt") == 0)
1756       {
1757       test_retry_arg = i + 1;
1758       goto END_ARG;
1759       }
1760
1761     /* -brw: Test rewrite configuration */
1762
1763     else if (Ustrcmp(argrest, "rw") == 0)
1764       {
1765       test_rewrite_arg = i + 1;
1766       goto END_ARG;
1767       }
1768
1769     /* -bS: Read SMTP commands on standard input, but produce no replies -
1770     all errors are reported by sending messages. */
1771
1772     else if (Ustrcmp(argrest, "S") == 0)
1773       smtp_input = smtp_batched_input = receiving_message = TRUE;
1774
1775     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1776     on standard output. */
1777
1778     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1779
1780     /* -bt: address testing mode */
1781
1782     else if (Ustrcmp(argrest, "t") == 0)
1783       address_test_mode = checking = log_testing_mode = TRUE;
1784
1785     /* -bv: verify addresses */
1786
1787     else if (Ustrcmp(argrest, "v") == 0)
1788       verify_address_mode = checking = log_testing_mode = TRUE;
1789
1790     /* -bvs: verify sender addresses */
1791
1792     else if (Ustrcmp(argrest, "vs") == 0)
1793       {
1794       verify_address_mode = checking = log_testing_mode = TRUE;
1795       verify_as_sender = TRUE;
1796       }
1797
1798     /* -bV: Print version string and support details */
1799
1800     else if (Ustrcmp(argrest, "V") == 0)
1801       {
1802       printf("Exim version %s #%s built %s\n", version_string,
1803         version_cnumber, version_date);
1804       printf("%s\n", CS version_copyright);
1805       version_printed = TRUE;
1806       show_whats_supported(stdout);
1807       }
1808
1809     else badarg = TRUE;
1810     break;
1811
1812
1813     /* -C: change configuration file list; ignore if it isn't really
1814     a change! Enforce a prefix check if required. */
1815
1816     case 'C':
1817     if (*argrest == 0)
1818       {
1819       if(++i < argc) argrest = argv[i]; else
1820         { badarg = TRUE; break; }
1821       }
1822     if (Ustrcmp(config_main_filelist, argrest) != 0)
1823       {
1824       #ifdef ALT_CONFIG_PREFIX
1825       int sep = 0;
1826       int len = Ustrlen(ALT_CONFIG_PREFIX);
1827       uschar *list = argrest;
1828       uschar *filename;
1829       while((filename = string_nextinlist(&list, &sep, big_buffer,
1830              big_buffer_size)) != NULL)
1831         {
1832         if ((Ustrlen(filename) < len ||
1833              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1834              Ustrstr(filename, "/../") != NULL) &&
1835              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1836           {
1837           fprintf(stderr, "-C Permission denied\n");
1838           exit(EXIT_FAILURE);
1839           }
1840         }
1841       #endif
1842
1843       config_main_filelist = argrest;
1844       config_changed = TRUE;
1845       }
1846     break;
1847
1848
1849     /* -D: set up a macro definition */
1850
1851     case 'D':
1852     #ifdef DISABLE_D_OPTION
1853     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1854     exit(EXIT_FAILURE);
1855     #else
1856       {
1857       int ptr = 0;
1858       macro_item *mlast = NULL;
1859       macro_item *m;
1860       uschar name[24];
1861       uschar *s = argrest;
1862
1863       while (isspace(*s)) s++;
1864
1865       if (*s < 'A' || *s > 'Z')
1866         {
1867         fprintf(stderr, "exim: macro name set by -D must start with "
1868           "an upper case letter\n");
1869         exit(EXIT_FAILURE);
1870         }
1871
1872       while (isalnum(*s) || *s == '_')
1873         {
1874         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1875         s++;
1876         }
1877       name[ptr] = 0;
1878       if (ptr == 0) { badarg = TRUE; break; }
1879       while (isspace(*s)) s++;
1880       if (*s != 0)
1881         {
1882         if (*s++ != '=') { badarg = TRUE; break; }
1883         while (isspace(*s)) s++;
1884         }
1885
1886       for (m = macros; m != NULL; m = m->next)
1887         {
1888         if (Ustrcmp(m->name, name) == 0)
1889           {
1890           fprintf(stderr, "exim: duplicated -D in command line\n");
1891           exit(EXIT_FAILURE);
1892           }
1893         mlast = m;
1894         }
1895
1896       m = store_get(sizeof(macro_item) + Ustrlen(name));
1897       m->next = NULL;
1898       m->command_line = TRUE;
1899       if (mlast == NULL) macros = m; else mlast->next = m;
1900       Ustrcpy(m->name, name);
1901       m->replacement = string_copy(s);
1902
1903       if (clmacro_count >= MAX_CLMACROS)
1904         {
1905         fprintf(stderr, "exim: too many -D options on command line\n");
1906         exit(EXIT_FAILURE);
1907         }
1908       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1909         m->replacement);
1910       }
1911     #endif
1912     break;
1913
1914     /* -d: Set debug level (see also -v below) or set the drop_cr option.
1915     The latter is now a no-op, retained for compatibility only. If -dd is used,
1916     debugging subprocesses of the daemon is disabled. */
1917
1918     case 'd':
1919     if (Ustrcmp(argrest, "ropcr") == 0)
1920       {
1921       /* drop_cr = TRUE; */
1922       }
1923
1924     /* Use an intermediate variable so that we don't set debugging while
1925     decoding the debugging bits. */
1926
1927     else
1928       {
1929       unsigned int selector = D_default;
1930       debug_selector = 0;
1931       debug_file = NULL;
1932       if (*argrest == 'd')
1933         {
1934         debug_daemon = TRUE;
1935         argrest++;
1936         }
1937       if (*argrest != 0)
1938         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1939           debug_options_count, US"debug");
1940       debug_selector = selector;
1941       }
1942     break;
1943
1944
1945     /* -E: This is a local error message. This option is not intended for
1946     external use at all, but is not restricted to trusted callers because it
1947     does no harm (just suppresses certain error messages) and if Exim is run
1948     not setuid root it won't always be trusted when it generates error
1949     messages using this option. If there is a message id following -E, point
1950     message_reference at it, for logging. */
1951
1952     case 'E':
1953     local_error_message = TRUE;
1954     if (mac_ismsgid(argrest)) message_reference = argrest;
1955     break;
1956
1957
1958     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1959     option, so it looks as if historically the -oex options are also callable
1960     without the leading -o. So we have to accept them. Before the switch,
1961     anything starting -oe has been converted to -e. Exim does not support all
1962     of the sendmail error options. */
1963
1964     case 'e':
1965     if (Ustrcmp(argrest, "e") == 0)
1966       {
1967       arg_error_handling = ERRORS_SENDER;
1968       errors_sender_rc = EXIT_SUCCESS;
1969       }
1970     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1971     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1972     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1973     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1974     else badarg = TRUE;
1975     break;
1976
1977
1978     /* -F: Set sender's full name, used instead of the gecos entry from
1979     the password file. Since users can usually alter their gecos entries,
1980     there's no security involved in using this instead. The data can follow
1981     the -F or be in the next argument. */
1982
1983     case 'F':
1984     if (*argrest == 0)
1985       {
1986       if(++i < argc) argrest = argv[i]; else
1987         { badarg = TRUE; break; }
1988       }
1989     originator_name = argrest;
1990     break;
1991
1992
1993     /* -f: Set sender's address - this value is only actually used if Exim is
1994     run by a trusted user, or if untrusted_set_sender is set and matches the
1995     address, except that the null address can always be set by any user. The
1996     test for this happens later, when the value given here is ignored when not
1997     permitted. For an untrusted user, the actual sender is still put in Sender:
1998     if it doesn't match the From: header (unless no_local_from_check is set).
1999     The data can follow the -f or be in the next argument. The -r switch is an
2000     obsolete form of -f but since there appear to be programs out there that
2001     use anything that sendmail has ever supported, better accept it - the
2002     synonymizing is done before the switch above.
2003
2004     At this stage, we must allow domain literal addresses, because we don't
2005     know what the setting of allow_domain_literals is yet. Ditto for trailing
2006     dots and strip_trailing_dot. */
2007
2008     case 'f':
2009       {
2010       int start, end;
2011       uschar *errmess;
2012       if (*argrest == 0)
2013         {
2014         if (i+1 < argc) argrest = argv[++i]; else
2015           { badarg = TRUE; break; }
2016         }
2017       if (*argrest == 0)
2018         {
2019         sender_address = string_sprintf("");  /* Ensure writeable memory */
2020         }
2021       else
2022         {
2023         uschar *temp = argrest + Ustrlen(argrest) - 1;
2024         while (temp >= argrest && isspace(*temp)) temp--;
2025         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2026         allow_domain_literals = TRUE;
2027         strip_trailing_dot = TRUE;
2028         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2029           &sender_address_domain, TRUE);
2030         allow_domain_literals = FALSE;
2031         strip_trailing_dot = FALSE;
2032         if (sender_address == NULL)
2033           {
2034           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2035           return EXIT_FAILURE;
2036           }
2037         }
2038       sender_address_forced = TRUE;
2039       }
2040     break;
2041
2042     /* This is some Sendmail thing which can be ignored */
2043
2044     case 'G':
2045     break;
2046
2047     /* -h: Set the hop count for an incoming message. Exim does not currently
2048     support this; it always computes it by counting the Received: headers.
2049     To put it in will require a change to the spool header file format. */
2050
2051     case 'h':
2052     if (*argrest == 0)
2053       {
2054       if(++i < argc) argrest = argv[i]; else
2055         { badarg = TRUE; break; }
2056       }
2057     if (!isdigit(*argrest)) badarg = TRUE;
2058     break;
2059
2060
2061     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2062     not to be documented for sendmail but mailx (at least) uses it) */
2063
2064     case 'i':
2065     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2066     break;
2067
2068
2069     case 'M':
2070     receiving_message = FALSE;
2071
2072     /* -MC:  continue delivery of another message via an existing open
2073     file descriptor. This option is used for an internal call by the
2074     smtp transport when there is a pending message waiting to go to an
2075     address to which it has got a connection. Five subsequent arguments are
2076     required: transport name, host name, IP address, sequence number, and
2077     message_id. Transports may decline to create new processes if the sequence
2078     number gets too big. The channel is stdin. This (-MC) must be the last
2079     argument. There's a subsequent check that the real-uid is privileged.
2080
2081     If we are running in the test harness. delay for a bit, to let the process
2082     that set this one up complete. This makes for repeatability of the logging,
2083     etc. output. */
2084
2085     if (Ustrcmp(argrest, "C") == 0)
2086       {
2087       if (argc != i + 6)
2088         {
2089         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2090         return EXIT_FAILURE;
2091         }
2092
2093       if (msg_action_arg >= 0)
2094         {
2095         fprintf(stderr, "exim: incompatible arguments\n");
2096         return EXIT_FAILURE;
2097         }
2098
2099       continue_transport = argv[++i];
2100       continue_hostname = argv[++i];
2101       continue_host_address = argv[++i];
2102       continue_sequence = Uatoi(argv[++i]);
2103       msg_action = MSG_DELIVER;
2104       msg_action_arg = ++i;
2105       forced_delivery = TRUE;
2106       queue_run_pid = passed_qr_pid;
2107       queue_run_pipe = passed_qr_pipe;
2108
2109       if (!mac_ismsgid(argv[i]))
2110         {
2111         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2112           argv[i]);
2113         return EXIT_FAILURE;
2114         }
2115
2116       if (running_in_test_harness) millisleep(500);
2117       break;
2118       }
2119
2120     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2121     precedes -MC (see above). The flag indicates that the host to which
2122     Exim is connected has accepted an AUTH sequence. */
2123
2124     else if (Ustrcmp(argrest, "CA") == 0)
2125       {
2126       smtp_authenticated = TRUE;
2127       break;
2128       }
2129
2130     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2131     it preceded -MC (see above) */
2132
2133     else if (Ustrcmp(argrest, "CP") == 0)
2134       {
2135       smtp_use_pipelining = TRUE;
2136       break;
2137       }
2138
2139     /* -MCQ: pass on the pid of the queue-running process that started
2140     this chain of deliveries and the fd of its synchronizing pipe; this
2141     is useful only when it precedes -MC (see above) */
2142
2143     else if (Ustrcmp(argrest, "CQ") == 0)
2144       {
2145       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2146         else badarg = TRUE;
2147       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2148         else badarg = TRUE;
2149       break;
2150       }
2151
2152     /* -MCS: set the smtp_use_size flag; this is useful only when it
2153     precedes -MC (see above) */
2154
2155     else if (Ustrcmp(argrest, "CS") == 0)
2156       {
2157       smtp_use_size = TRUE;
2158       break;
2159       }
2160
2161     /* -MCT: set the tls_offered flag; this is useful only when it
2162     precedes -MC (see above). The flag indicates that the host to which
2163     Exim is connected has offered TLS support. */
2164
2165     #ifdef SUPPORT_TLS
2166     else if (Ustrcmp(argrest, "CT") == 0)
2167       {
2168       tls_offered = TRUE;
2169       break;
2170       }
2171     #endif
2172
2173     /* -M[x]: various operations on the following list of message ids:
2174        -M    deliver the messages, ignoring next retry times and thawing
2175        -Mc   deliver the messages, checking next retry times, no thawing
2176        -Mf   freeze the messages
2177        -Mg   give up on the messages
2178        -Mt   thaw the messages
2179        -Mrm  remove the messages
2180     In the above cases, this must be the last option. There are also the
2181     following options which are followed by a single message id, and which
2182     act on that message. Some of them use the "recipient" addresses as well.
2183        -Mar  add recipient(s)
2184        -Mmad mark all recipients delivered
2185        -Mmd  mark recipients(s) delivered
2186        -Mes  edit sender
2187        -Mvb  show body
2188        -Mvh  show header
2189        -Mvl  show log
2190     */
2191
2192     else if (*argrest == 0)
2193       {
2194       msg_action = MSG_DELIVER;
2195       forced_delivery = deliver_force_thaw = TRUE;
2196       }
2197     else if (Ustrcmp(argrest, "ar") == 0)
2198       {
2199       msg_action = MSG_ADD_RECIPIENT;
2200       one_msg_action = TRUE;
2201       }
2202     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2203     else if (Ustrcmp(argrest, "es") == 0)
2204       {
2205       msg_action = MSG_EDIT_SENDER;
2206       one_msg_action = TRUE;
2207       }
2208     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2209     else if (Ustrcmp(argrest, "g") == 0)
2210       {
2211       msg_action = MSG_DELIVER;
2212       deliver_give_up = TRUE;
2213       }
2214     else if (Ustrcmp(argrest, "mad") == 0)
2215       {
2216       msg_action = MSG_MARK_ALL_DELIVERED;
2217       }
2218     else if (Ustrcmp(argrest, "md") == 0)
2219       {
2220       msg_action = MSG_MARK_DELIVERED;
2221       one_msg_action = TRUE;
2222       }
2223     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2224     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2225     else if (Ustrcmp(argrest, "vb") == 0)
2226       {
2227       msg_action = MSG_SHOW_BODY;
2228       one_msg_action = TRUE;
2229       }
2230     else if (Ustrcmp(argrest, "vh") == 0)
2231       {
2232       msg_action = MSG_SHOW_HEADER;
2233       one_msg_action = TRUE;
2234       }
2235     else if (Ustrcmp(argrest, "vl") == 0)
2236       {
2237       msg_action = MSG_SHOW_LOG;
2238       one_msg_action = TRUE;
2239       }
2240     else { badarg = TRUE; break; }
2241
2242     /* All the -Mxx options require at least one message id. */
2243
2244     msg_action_arg = i + 1;
2245     if (msg_action_arg >= argc)
2246       {
2247       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2248       return EXIT_FAILURE;
2249       }
2250
2251     /* Some require only message ids to follow */
2252
2253     if (!one_msg_action)
2254       {
2255       int j;
2256       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2257         {
2258         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2259           argv[j], arg);
2260         return EXIT_FAILURE;
2261         }
2262       goto END_ARG;   /* Remaining args are ids */
2263       }
2264
2265     /* Others require only one message id, possibly followed by addresses,
2266     which will be handled as normal arguments. */
2267
2268     else
2269       {
2270       if (!mac_ismsgid(argv[msg_action_arg]))
2271         {
2272         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2273           argv[msg_action_arg], arg);
2274         return EXIT_FAILURE;
2275         }
2276       i++;
2277       }
2278     break;
2279
2280
2281     /* Some programs seem to call the -om option without the leading o;
2282     for sendmail it askes for "me too". Exim always does this. */
2283
2284     case 'm':
2285     if (*argrest != 0) badarg = TRUE;
2286     break;
2287
2288
2289     /* -N: don't do delivery - a debugging option that stops transports doing
2290     their thing. It implies debugging at the D_v level. */
2291
2292     case 'N':
2293     if (*argrest == 0)
2294       {
2295       dont_deliver = TRUE;
2296       debug_selector |= D_v;
2297       debug_file = stderr;
2298       }
2299     else badarg = TRUE;
2300     break;
2301
2302
2303     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2304     it. */
2305
2306     case 'n':
2307     break;
2308
2309     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2310     option to the specified value. This form uses long names. We need to handle
2311     -O option=value and -Ooption=value. */
2312
2313     case 'O':
2314     if (*argrest == 0)
2315       {
2316       if (++i >= argc)
2317         {
2318         fprintf(stderr, "exim: string expected after -O\n");
2319         exit(EXIT_FAILURE);
2320         }
2321       }
2322     break;
2323
2324     case 'o':
2325
2326     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2327     file" option). */
2328
2329     if (*argrest == 'A')
2330       {
2331       alias_arg = argrest + 1;
2332       if (alias_arg[0] == 0)
2333         {
2334         if (i+1 < argc) alias_arg = argv[++i]; else
2335           {
2336           fprintf(stderr, "exim: string expected after -oA\n");
2337           exit(EXIT_FAILURE);
2338           }
2339         }
2340       }
2341
2342     /* -oB: Set a connection message max value for remote deliveries */
2343
2344     else if (*argrest == 'B')
2345       {
2346       uschar *p = argrest + 1;
2347       if (p[0] == 0)
2348         {
2349         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2350           {
2351           connection_max_messages = 1;
2352           p = NULL;
2353           }
2354         }
2355
2356       if (p != NULL)
2357         {
2358         if (!isdigit(*p))
2359           {
2360           fprintf(stderr, "exim: number expected after -oB\n");
2361           exit(EXIT_FAILURE);
2362           }
2363         connection_max_messages = Uatoi(p);
2364         }
2365       }
2366
2367     /* -odb: background delivery */
2368
2369     else if (Ustrcmp(argrest, "db") == 0)
2370       {
2371       synchronous_delivery = FALSE;
2372       arg_queue_only = FALSE;
2373       queue_only_set = TRUE;
2374       }
2375
2376     /* -odf: foreground delivery (smail-compatible option); same effect as
2377        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2378     */
2379
2380     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2381       {
2382       synchronous_delivery = TRUE;
2383       arg_queue_only = FALSE;
2384       queue_only_set = TRUE;
2385       }
2386
2387     /* -odq: queue only */
2388
2389     else if (Ustrcmp(argrest, "dq") == 0)
2390       {
2391       synchronous_delivery = FALSE;
2392       arg_queue_only = TRUE;
2393       queue_only_set = TRUE;
2394       }
2395
2396     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2397     but no remote delivery */
2398
2399     else if (Ustrcmp(argrest, "dqs") == 0)
2400       {
2401       queue_smtp = TRUE;
2402       arg_queue_only = FALSE;
2403       queue_only_set = TRUE;
2404       }
2405
2406     /* -oex: Sendmail error flags. As these are also accepted without the
2407     leading -o prefix, for compatibility with vacation and other callers,
2408     they are handled with -e above. */
2409
2410     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2411        -oitrue: Another sendmail syntax for the same */
2412
2413     else if (Ustrcmp(argrest, "i") == 0 ||
2414              Ustrcmp(argrest, "itrue") == 0)
2415       dot_ends = FALSE;
2416
2417     /* -oM*: Set various characteristics for an incoming message; actually
2418     acted on for trusted callers only. */
2419
2420     else if (*argrest == 'M')
2421       {
2422       if (i+1 >= argc)
2423         {
2424         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2425         exit(EXIT_FAILURE);
2426         }
2427
2428       /* -oMa: Set sender host address */
2429
2430       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2431
2432       /* -oMaa: Set authenticator name */
2433
2434       else if (Ustrcmp(argrest, "Maa") == 0)
2435         sender_host_authenticated = argv[++i];
2436
2437       /* -oMas: setting authenticated sender */
2438
2439       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2440
2441       /* -oMai: setting authenticated id */
2442
2443       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2444
2445       /* -oMi: Set incoming interface address */
2446
2447       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2448
2449       /* -oMr: Received protocol */
2450
2451       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2452
2453       /* -oMs: Set sender host name */
2454
2455       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2456
2457       /* -oMt: Set sender ident */
2458
2459       else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2460
2461       /* Else a bad argument */
2462
2463       else
2464         {
2465         badarg = TRUE;
2466         break;
2467         }
2468       }
2469
2470     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2471     seem to call this as -m (undocumented), so that is also accepted (see
2472     above). */
2473
2474     else if (Ustrcmp(argrest, "m") == 0) {}
2475
2476     /* -oo: An ancient flag for old-style addresses which still seems to
2477     crop up in some calls (see in SCO). */
2478
2479     else if (Ustrcmp(argrest, "o") == 0) {}
2480
2481     /* -oP <name>: set pid file path for daemon */
2482
2483     else if (Ustrcmp(argrest, "P") == 0)
2484       override_pid_file_path = argv[++i];
2485
2486     /* -or <n>: set timeout for non-SMTP acceptance
2487        -os <n>: set timeout for SMTP acceptance */
2488
2489     else if (*argrest == 'r' || *argrest == 's')
2490       {
2491       int *tp = (*argrest == 'r')?
2492         &arg_receive_timeout : &arg_smtp_receive_timeout;
2493       if (argrest[1] == 0)
2494         {
2495         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2496         }
2497       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2498       if (*tp < 0)
2499         {
2500         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2501         exit(EXIT_FAILURE);
2502         }
2503       }
2504
2505     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2506
2507     else if (Ustrcmp(argrest, "X") == 0)
2508       override_local_interfaces = argv[++i];
2509
2510     /* Unknown -o argument */
2511
2512     else badarg = TRUE;
2513     break;
2514
2515
2516     /* -ps: force Perl startup; -pd force delayed Perl startup */
2517
2518     case 'p':
2519     #ifdef EXIM_PERL
2520     if (*argrest == 's' && argrest[1] == 0)
2521       {
2522       perl_start_option = 1;
2523       break;
2524       }
2525     if (*argrest == 'd' && argrest[1] == 0)
2526       {
2527       perl_start_option = -1;
2528       break;
2529       }
2530     #endif
2531
2532     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2533     which sets the host protocol and host name */
2534
2535     if (*argrest == 0)
2536       {
2537       if (i+1 < argc) argrest = argv[++i]; else
2538         { badarg = TRUE; break; }
2539       }
2540
2541     if (*argrest != 0)
2542       {
2543       uschar *hn = Ustrchr(argrest, ':');
2544       if (hn == NULL)
2545         {
2546         received_protocol = argrest;
2547         }
2548       else
2549         {
2550         received_protocol = string_copyn(argrest, hn - argrest);
2551         sender_host_name = hn + 1;
2552         }
2553       }
2554     break;
2555
2556
2557     case 'q':
2558     receiving_message = FALSE;
2559
2560     /* -qq...: Do queue runs in a 2-stage manner */
2561
2562     if (*argrest == 'q')
2563       {
2564       queue_2stage = TRUE;
2565       argrest++;
2566       }
2567
2568     /* -qi...: Do only first (initial) deliveries */
2569
2570     if (*argrest == 'i')
2571       {
2572       queue_run_first_delivery = TRUE;
2573       argrest++;
2574       }
2575
2576     /* -qf...: Run the queue, forcing deliveries
2577        -qff..: Ditto, forcing thawing as well */
2578
2579     if (*argrest == 'f')
2580       {
2581       queue_run_force = TRUE;
2582       if (*(++argrest) == 'f')
2583         {
2584         deliver_force_thaw = TRUE;
2585         argrest++;
2586         }
2587       }
2588
2589     /* -q[f][f]l...: Run the queue only on local deliveries */
2590
2591     if (*argrest == 'l')
2592       {
2593       queue_run_local = TRUE;
2594       argrest++;
2595       }
2596
2597     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2598     optionally starting from a given message id. */
2599
2600     if (*argrest == 0 &&
2601         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2602       {
2603       queue_interval = 0;
2604       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2605         start_queue_run_id = argv[++i];
2606       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2607         stop_queue_run_id = argv[++i];
2608       }
2609
2610     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2611     optionally local only. */
2612
2613     else
2614       {
2615       if (*argrest != 0)
2616         queue_interval = readconf_readtime(argrest, 0, FALSE);
2617       else
2618         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2619       if (queue_interval <= 0)
2620         {
2621         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2622         exit(EXIT_FAILURE);
2623         }
2624       }
2625     break;
2626
2627
2628     case 'R':   /* Synonymous with -qR... */
2629     receiving_message = FALSE;
2630
2631     /* -Rf:   As -R (below) but force all deliveries,
2632        -Rff:  Ditto, but also thaw all frozen messages,
2633        -Rr:   String is regex
2634        -Rrf:  Regex and force
2635        -Rrff: Regex and force and thaw
2636
2637     in all cases provided there are no further characters in this
2638     argument. */
2639
2640     if (*argrest != 0)
2641       {
2642       int i;
2643       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2644         {
2645         if (Ustrcmp(argrest, rsopts[i]) == 0)
2646           {
2647           if (i != 2) queue_run_force = TRUE;
2648           if (i >= 2) deliver_selectstring_regex = TRUE;
2649           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2650           argrest += Ustrlen(rsopts[i]);
2651           }
2652         }
2653       }
2654
2655     /* -R: Set string to match in addresses for forced queue run to
2656     pick out particular messages. */
2657
2658     if (*argrest == 0)
2659       {
2660       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2661         {
2662         fprintf(stderr, "exim: string expected after -R\n");
2663         exit(EXIT_FAILURE);
2664         }
2665       }
2666     else deliver_selectstring = argrest;
2667     if (queue_interval < 0) queue_interval = 0;
2668     break;
2669
2670
2671     /* -r: an obsolete synonym for -f (see above) */
2672
2673
2674     /* -S: Like -R but works on sender. */
2675
2676     case 'S':   /* Synonymous with -qS... */
2677     receiving_message = FALSE;
2678
2679     /* -Sf:   As -S (below) but force all deliveries,
2680        -Sff:  Ditto, but also thaw all frozen messages,
2681        -Sr:   String is regex
2682        -Srf:  Regex and force
2683        -Srff: Regex and force and thaw
2684
2685     in all cases provided there are no further characters in this
2686     argument. */
2687
2688     if (*argrest != 0)
2689       {
2690       int i;
2691       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2692         {
2693         if (Ustrcmp(argrest, rsopts[i]) == 0)
2694           {
2695           if (i != 2) queue_run_force = TRUE;
2696           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2697           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2698           argrest += Ustrlen(rsopts[i]);
2699           }
2700         }
2701       }
2702
2703     /* -S: Set string to match in addresses for forced queue run to
2704     pick out particular messages. */
2705
2706     if (*argrest == 0)
2707       {
2708       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2709         {
2710         fprintf(stderr, "exim: string expected after -S\n");
2711         exit(EXIT_FAILURE);
2712         }
2713       }
2714     else deliver_selectstring_sender = argrest;
2715     if (queue_interval < 0) queue_interval = 0;
2716     break;
2717
2718     /* -Tqt is an option that is exclusively for use by the testing suite.
2719     It is not recognized in other circumstances. It allows for the setting up
2720     of explicit "queue times" so that various warning/retry things can be
2721     tested. Otherwise variability of clock ticks etc. cause problems. */
2722
2723     case 'T':
2724     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2725       fudged_queue_times = argv[++i];
2726     else badarg = TRUE;
2727     break;
2728
2729
2730     /* -t: Set flag to extract recipients from body of message. */
2731
2732     case 't':
2733     if (*argrest == 0) extract_recipients = TRUE;
2734
2735     /* -ti: Set flag to extract recipients from body of message, and also
2736     specify that dot does not end the message. */
2737
2738     else if (Ustrcmp(argrest, "i") == 0)
2739       {
2740       extract_recipients = TRUE;
2741       dot_ends = FALSE;
2742       }
2743
2744     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2745
2746     #ifdef SUPPORT_TLS
2747     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2748     #endif
2749
2750     else badarg = TRUE;
2751     break;
2752
2753
2754     /* -U: This means "initial user submission" in sendmail, apparently. The
2755     doc claims that in future sendmail may refuse syntactically invalid
2756     messages instead of fixing them. For the moment, we just ignore it. */
2757
2758     case 'U':
2759     break;
2760
2761
2762     /* -v: verify things - this is a very low-level debugging */
2763
2764     case 'v':
2765     if (*argrest == 0)
2766       {
2767       debug_selector |= D_v;
2768       debug_file = stderr;
2769       }
2770     else badarg = TRUE;
2771     break;
2772
2773
2774     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2775
2776       The -x flag tells the sendmail command that mail from a local
2777       mail program has National Language Support (NLS) extended characters
2778       in the body of the mail item. The sendmail command can send mail with
2779       extended NLS characters across networks that normally corrupts these
2780       8-bit characters.
2781
2782     As Exim is 8-bit clean, it just ignores this flag. */
2783
2784     case 'x':
2785     if (*argrest != 0) badarg = TRUE;
2786     break;
2787
2788     /* All other initial characters are errors */
2789
2790     default:
2791     badarg = TRUE;
2792     break;
2793     }         /* End of high-level switch statement */
2794
2795   /* Failed to recognize the option, or syntax error */
2796
2797   if (badarg)
2798     {
2799     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2800       "option %s\n", arg);
2801     exit(EXIT_FAILURE);
2802     }
2803   }
2804
2805
2806 /* Arguments have been processed. Check for incompatibilities. */
2807
2808 END_ARG:
2809 if ((
2810     (smtp_input || extract_recipients || recipients_arg < argc) &&
2811     (daemon_listen || queue_interval >= 0 || bi_option ||
2812       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2813       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2814     ) ||
2815     (
2816     msg_action_arg > 0 &&
2817     (daemon_listen || queue_interval >= 0 || list_options || checking ||
2818      bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2819     ) ||
2820     (
2821     (daemon_listen || queue_interval >= 0) &&
2822     (sender_address != NULL || list_options || list_queue || checking ||
2823      bi_option)
2824     ) ||
2825     (
2826     daemon_listen && queue_interval == 0
2827     ) ||
2828     (
2829     list_options &&
2830     (checking || smtp_input || extract_recipients ||
2831       filter_test != FTEST_NONE || bi_option)
2832     ) ||
2833     (
2834     verify_address_mode &&
2835     (address_test_mode || smtp_input || extract_recipients ||
2836       filter_test != FTEST_NONE || bi_option)
2837     ) ||
2838     (
2839     address_test_mode && (smtp_input || extract_recipients ||
2840       filter_test != FTEST_NONE || bi_option)
2841     ) ||
2842     (
2843     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2844       extract_recipients)
2845     ) ||
2846     (
2847     deliver_selectstring != NULL && queue_interval < 0
2848     )
2849    )
2850   {
2851   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2852   exit(EXIT_FAILURE);
2853   }
2854
2855 /* If debugging is set up, set the file and the file descriptor to pass on to
2856 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2857 to run in the foreground. */
2858
2859 if (debug_selector != 0)
2860   {
2861   debug_file = stderr;
2862   debug_fd = fileno(debug_file);
2863   background_daemon = FALSE;
2864   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
2865   if (debug_selector != D_v)    /* -v only doesn't show this */
2866     {
2867     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2868       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2869       debug_selector);
2870     show_whats_supported(stderr);
2871     }
2872   }
2873
2874 /* When started with root privilege, ensure that the limits on the number of
2875 open files and the number of processes (where that is accessible) are
2876 sufficiently large, or are unset, in case Exim has been called from an
2877 environment where the limits are screwed down. Not all OS have the ability to
2878 change some of these limits. */
2879
2880 if (unprivileged)
2881   {
2882   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2883   }
2884 else
2885   {
2886   struct rlimit rlp;
2887
2888   #ifdef RLIMIT_NOFILE
2889   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2890     {
2891     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2892       strerror(errno));
2893     rlp.rlim_cur = rlp.rlim_max = 0;
2894     }
2895
2896   /* I originally chose 1000 as a nice big number that was unlikely to
2897   be exceeded. It turns out that some older OS have a fixed upper limit of
2898   256. */
2899
2900   if (rlp.rlim_cur < 1000)
2901     {
2902     rlp.rlim_cur = rlp.rlim_max = 1000;
2903     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2904       {
2905       rlp.rlim_cur = rlp.rlim_max = 256;
2906       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2907         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2908           strerror(errno));
2909       }
2910     }
2911   #endif
2912
2913   #ifdef RLIMIT_NPROC
2914   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2915     {
2916     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2917       strerror(errno));
2918     rlp.rlim_cur = rlp.rlim_max = 0;
2919     }
2920
2921   #ifdef RLIM_INFINITY
2922   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2923     {
2924     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2925   #else
2926   if (rlp.rlim_cur < 1000)
2927     {
2928     rlp.rlim_cur = rlp.rlim_max = 1000;
2929   #endif
2930     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2931       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2932         strerror(errno));
2933     }
2934   #endif
2935   }
2936
2937 /* Exim is normally entered as root (but some special configurations are
2938 possible that don't do this). However, it always spins off sub-processes that
2939 set their uid and gid as required for local delivery. We don't want to pass on
2940 any extra groups that root may belong to, so we want to get rid of them all at
2941 this point.
2942
2943 We need to obey setgroups() at this stage, before possibly giving up root
2944 privilege for a changed configuration file, but later on we might need to
2945 check on the additional groups for the admin user privilege - can't do that
2946 till after reading the config, which might specify the exim gid. Therefore,
2947 save the group list here first. */
2948
2949 group_count = getgroups(NGROUPS_MAX, group_list);
2950
2951 /* There is a fundamental difference in some BSD systems in the matter of
2952 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2953 known not to be different. On the "different" systems there is a single group
2954 list, and the first entry in it is the current group. On all other versions of
2955 Unix there is a supplementary group list, which is in *addition* to the current
2956 group. Consequently, to get rid of all extraneous groups on a "standard" system
2957 you pass over 0 groups to setgroups(), while on a "different" system you pass
2958 over a single group - the current group, which is always the first group in the
2959 list. Calling setgroups() with zero groups on a "different" system results in
2960 an error return. The following code should cope with both types of system.
2961
2962 However, if this process isn't running as root, setgroups() can't be used
2963 since you have to be root to run it, even if throwing away groups. Not being
2964 root here happens only in some unusual configurations. We just ignore the
2965 error. */
2966
2967 if (setgroups(0, NULL) != 0)
2968   {
2969   if (setgroups(1, group_list) != 0 && !unprivileged)
2970     {
2971     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2972     exit(EXIT_FAILURE);
2973     }
2974   }
2975
2976 /* If the configuration file name has been altered by an argument on the
2977 command line (either a new file name or a macro definition) and the caller is
2978 not root or the exim user, or if this is a filter testing run, remove any
2979 setuid privilege the program has, and run as the underlying user.
2980
2981 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2982 severely restricts the use of -C for some purposes.
2983
2984 Otherwise, set the real ids to the effective values (should be root unless run
2985 from inetd, which it can either be root or the exim uid, if one is configured).
2986
2987 There is a private mechanism for bypassing some of this, in order to make it
2988 possible to test lots of configurations automatically, without having either to
2989 recompile each time, or to patch in an actual configuration file name and other
2990 values (such as the path name). If running in the test harness, pretend that
2991 configuration file changes and macro definitions haven't happened. */
2992
2993 if ((                                            /* EITHER */
2994     (config_changed || macros != NULL) &&        /* Config changed, and */
2995     real_uid != root_uid &&                      /* Not root, and */
2996     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
2997     real_uid != exim_uid &&                      /* Not exim, and */
2998     #endif
2999     !running_in_test_harness                     /* Not fudged */
3000     ) ||                                         /*   OR   */
3001     expansion_test                               /* expansion testing */
3002     ||                                           /*   OR   */
3003     filter_test != FTEST_NONE)                   /* Filter testing */
3004   {
3005   setgroups(group_count, group_list);
3006   exim_setugid(real_uid, real_gid, FALSE,
3007     US"-C, -D, -be or -bf forces real uid");
3008   removed_privilege = TRUE;
3009
3010   /* In the normal case when Exim is called like this, stderr is available
3011   and should be used for any logging information because attempts to write
3012   to the log will usually fail. To arrange this, we unset really_exim. However,
3013   if no stderr is available there is no point - we might as well have a go
3014   at the log (if it fails, syslog will be written). */
3015
3016   if (log_stderr != NULL) really_exim = FALSE;
3017   }
3018
3019 /* Privilege is to be retained for the moment. It may be dropped later,
3020 depending on the job that this Exim process has been asked to do. For now, set
3021 the real uid to the effective so that subsequent re-execs of Exim are done by a
3022 privileged user. */
3023
3024 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3025
3026 /* If testing a filter, open the file(s) now, before wasting time doing other
3027 setups and reading the message. */
3028
3029 if ((filter_test & FTEST_SYSTEM) != 0)
3030   {
3031   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3032   if (filter_sfd < 0)
3033     {
3034     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3035       strerror(errno));
3036     return EXIT_FAILURE;
3037     }
3038   }
3039
3040 if ((filter_test & FTEST_USER) != 0)
3041   {
3042   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3043   if (filter_ufd < 0)
3044     {
3045     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3046       strerror(errno));
3047     return EXIT_FAILURE;
3048     }
3049   }
3050
3051 /* Read the main runtime configuration data; this gives up if there
3052 is a failure. It leaves the configuration file open so that the subsequent
3053 configuration data for delivery can be read if needed. */
3054
3055 readconf_main();
3056
3057 /* Handle the decoding of logging options. */
3058
3059 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3060   log_options, log_options_count, US"log");
3061
3062 DEBUG(D_any)
3063   {
3064   debug_printf("configuration file is %s\n", config_main_filename);
3065   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3066     log_extra_selector);
3067   }
3068
3069 /* If domain literals are not allowed, check the sender address that was
3070 supplied with -f. Ditto for a stripped trailing dot. */
3071
3072 if (sender_address != NULL)
3073   {
3074   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3075     {
3076     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3077       "allowed\n", sender_address);
3078     return EXIT_FAILURE;
3079     }
3080   if (f_end_dot && !strip_trailing_dot)
3081     {
3082     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3083       "(trailing dot not allowed)\n", sender_address);
3084     return EXIT_FAILURE;
3085     }
3086   }
3087
3088 /* Paranoia check of maximum lengths of certain strings. There is a check
3089 on the length of the log file path in log.c, which will come into effect
3090 if there are any calls to write the log earlier than this. However, if we
3091 get this far but the string is very long, it is better to stop now than to
3092 carry on and (e.g.) receive a message and then have to collapse. The call to
3093 log_write() from here will cause the ultimate panic collapse if the complete
3094 file name exceeds the buffer length. */
3095
3096 if (Ustrlen(log_file_path) > 200)
3097   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3098     "log_file_path is longer than 200 chars: aborting");
3099
3100 if (Ustrlen(pid_file_path) > 200)
3101   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3102     "pid_file_path is longer than 200 chars: aborting");
3103
3104 if (Ustrlen(spool_directory) > 200)
3105   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3106     "spool_directory is longer than 200 chars: aborting");
3107
3108 /* Length check on the process name given to syslog for its TAG field,
3109 which is only permitted to be 32 characters or less. See RFC 3164. */
3110
3111 if (Ustrlen(syslog_processname) > 32)
3112   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3113     "syslog_processname is longer than 32 chars: aborting");
3114
3115 /* In some operating systems, the environment variable TMPDIR controls where
3116 temporary files are created; Exim doesn't use these (apart from when delivering
3117 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3118 If TMPDIR is found in the environment, reset it to the value defined in the
3119 TMPDIR macro, if this macro is defined. */
3120
3121 #ifdef TMPDIR
3122   {
3123   uschar **p;
3124   for (p = USS environ; *p != NULL; p++)
3125     {
3126     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3127         Ustrcmp(*p+7, TMPDIR) != 0)
3128       {
3129       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3130       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3131       *p = newp;
3132       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3133       }
3134     }
3135   }
3136 #endif
3137
3138 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3139 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3140 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3141 called by a user who has set the TZ variable. This then affects the timestamps
3142 in log files and in Received: headers, and any created Date: header lines. The
3143 required timezone is settable in the configuration file, so nothing can be done
3144 about this earlier - but hopefully nothing will normally be logged earlier than
3145 this. We have to make a new environment if TZ is wrong, but don't bother if
3146 timestamps_utc is set, because then all times are in UTC anyway. */
3147
3148 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3149   {
3150   timestamps_utc = TRUE;
3151   }
3152 else
3153   {
3154   uschar *envtz = US getenv("TZ");
3155   if ((envtz == NULL && timezone_string != NULL) ||
3156       (envtz != NULL &&
3157         (timezone_string == NULL ||
3158          Ustrcmp(timezone_string, envtz) != 0)))
3159     {
3160     uschar **p = USS environ;
3161     uschar **new;
3162     uschar **newp;
3163     int count = 0;
3164     while (*p++ != NULL) count++;
3165     if (envtz == NULL) count++;
3166     newp = new = malloc(sizeof(uschar *) * (count + 1));
3167     for (p = USS environ; *p != NULL; p++)
3168       {
3169       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3170       *newp++ = *p;
3171       }
3172     if (timezone_string != NULL)
3173       {
3174       *newp = malloc(Ustrlen(timezone_string) + 4);
3175       sprintf(CS *newp++, "TZ=%s", timezone_string);
3176       }
3177     *newp = NULL;
3178     environ = CSS new;
3179     tzset();
3180     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3181       tod_stamp(tod_log));
3182     }
3183   }
3184
3185 /* Handle the case when we have removed the setuid privilege because of -C or
3186 -D. This means that the caller of Exim was not root, and, provided that
3187 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3188 the binary.
3189
3190 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3191 were running as the exim user defined in the configuration file (different to
3192 the one in the binary). The sysadmin may expect this case to retain privilege
3193 because "the binary was called by the Exim user", but it hasn't, because of the
3194 order in which it handles this stuff. There are two possibilities:
3195
3196   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3197       to do message deliveries. Thus, the fact that it is running as a
3198       non-privileged user is plausible, and might be wanted in some special
3199       configurations. However, really_exim will have been set false when
3200       privilege was dropped, to stop Exim trying to write to its normal log
3201       files. Therefore, re-enable normal log processing, assuming the sysadmin
3202       has set up the log directory correctly.
3203
3204   (2) If deliver_drop_privilege is not set, the configuration won't work as
3205       apparently intended, and so we log a panic message. In order to retain
3206       root for -C or -D, the caller must either be root or the Exim user
3207       defined in the binary (when deliver_drop_ privilege is false).
3208
3209 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3210 built-in exim user or one defined in the configuration. In either event,
3211 re-enable log processing, assuming the sysadmin knows what they are doing. */
3212
3213 if (removed_privilege && (config_changed || macros != NULL) &&
3214     real_uid == exim_uid)
3215   {
3216   #ifdef ALT_CONFIG_ROOT_ONLY
3217   really_exim = TRUE;   /* let logging work normally */
3218   #else
3219
3220   if (deliver_drop_privilege)
3221     really_exim = TRUE; /* let logging work normally */
3222   else
3223     log_write(0, LOG_MAIN|LOG_PANIC,
3224       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3225       (int)exim_uid, config_changed? "-C" : "-D");
3226   #endif
3227   }
3228
3229 /* Start up Perl interpreter if Perl support is configured and there is a
3230 perl_startup option, and the configuration or the command line specifies
3231 initializing starting. Note that the global variables are actually called
3232 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3233
3234 #ifdef EXIM_PERL
3235 if (perl_start_option != 0)
3236   opt_perl_at_start = (perl_start_option > 0);
3237 if (opt_perl_at_start && opt_perl_startup != NULL)
3238   {
3239   uschar *errstr;
3240   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3241   errstr = init_perl(opt_perl_startup);
3242   if (errstr != NULL)
3243     {
3244     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3245     return EXIT_FAILURE;
3246     }
3247   opt_perl_started = TRUE;
3248   }
3249 #endif /* EXIM_PERL */
3250
3251 /* Log the arguments of the call if the configuration file said so. This is
3252 a debugging feature for finding out what arguments certain MUAs actually use.
3253 Don't attempt it if logging is disabled, or if listing variables or if
3254 verifying/testing addresses or expansions. */
3255
3256 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3257       && really_exim && !list_options && !checking)
3258   {
3259   int i;
3260   uschar *p = big_buffer;
3261   Ustrcpy(p, "cwd=");
3262   (void)getcwd(CS p+4, big_buffer_size - 4);
3263   while (*p) p++;
3264   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3265   while (*p) p++;
3266   for (i = 0; i < argc; i++)
3267     {
3268     int len = Ustrlen(argv[i]);
3269     uschar *printing;
3270     uschar *quote;
3271     if (p + len + 8 >= big_buffer + big_buffer_size)
3272       {
3273       Ustrcpy(p, " ...");
3274       log_write(0, LOG_MAIN, "%s", big_buffer);
3275       Ustrcpy(big_buffer, "...");
3276       p = big_buffer + 3;
3277       }
3278     printing = string_printing(argv[i]);
3279     if (printing[0] == 0) quote = US"\""; else
3280       {
3281       uschar *pp = printing;
3282       quote = US"";
3283       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3284       }
3285     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3286       (p - big_buffer) - 4), printing, quote);
3287     while (*p) p++;
3288     }
3289
3290   if ((log_extra_selector & LX_arguments) != 0)
3291     log_write(0, LOG_MAIN, "%s", big_buffer);
3292   else
3293     debug_printf("%s\n", big_buffer);
3294   }
3295
3296 /* Set the working directory to be the top-level spool directory. We don't rely
3297 on this in the code, which always uses fully qualified names, but it's useful
3298 for core dumps etc. Don't complain if it fails - the spool directory might not
3299 be generally accessible and calls with the -C option (and others) have lost
3300 privilege by now. */
3301
3302 if (Uchdir(spool_directory) != 0)
3303   {
3304   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3305   (void)Uchdir(spool_directory);
3306   }
3307
3308 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3309 alias file. Exim doesn't have such a concept, but this call is screwed into
3310 Sun's YP makefiles. Handle this by calling a configured script, as the real
3311 user who called Exim. The -oA option can be used to pass an argument to the
3312 script. */
3313
3314 if (bi_option)
3315   {
3316   (void)fclose(config_file);
3317   if (bi_command != NULL)
3318     {
3319     int i = 0;
3320     uschar *argv[3];
3321     argv[i++] = bi_command;
3322     if (alias_arg != NULL) argv[i++] = alias_arg;
3323     argv[i++] = NULL;
3324
3325     setgroups(group_count, group_list);
3326     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3327
3328     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3329       (argv[1] == NULL)? US"" : argv[1]);
3330
3331     execv(CS argv[0], (char *const *)argv);
3332     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3333     exit(EXIT_FAILURE);
3334     }
3335   else
3336     {
3337     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3338     exit(EXIT_SUCCESS);
3339     }
3340   }
3341
3342 /* If an action on specific messages is requested, or if a daemon or queue
3343 runner is being started, we need to know if Exim was called by an admin user.
3344 This is the case if the real user is root or exim, or if the real group is
3345 exim, or if one of the supplementary groups is exim or a group listed in
3346 admin_groups. We don't fail all message actions immediately if not admin_user,
3347 since some actions can be performed by non-admin users. Instead, set admin_user
3348 for later interrogation. */
3349
3350 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3351   admin_user = TRUE;
3352 else
3353   {
3354   int i, j;
3355
3356   for (i = 0; i < group_count; i++)
3357     {
3358     if (group_list[i] == exim_gid) admin_user = TRUE;
3359     else if (admin_groups != NULL)
3360       {
3361       for (j = 1; j <= (int)(admin_groups[0]); j++)
3362         if (admin_groups[j] == group_list[i])
3363           { admin_user = TRUE; break; }
3364       }
3365     if (admin_user) break;
3366     }
3367   }
3368
3369 /* Another group of privileged users are the trusted users. These are root,
3370 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3371 are permitted to specify sender_addresses with -f on the command line, and
3372 other message parameters as well. */
3373
3374 if (real_uid == root_uid || real_uid == exim_uid)
3375   trusted_caller = TRUE;
3376 else
3377   {
3378   int i, j;
3379
3380   if (trusted_users != NULL)
3381     {
3382     for (i = 1; i <= (int)(trusted_users[0]); i++)
3383       if (trusted_users[i] == real_uid)
3384         { trusted_caller = TRUE; break; }
3385     }
3386
3387   if (!trusted_caller && trusted_groups != NULL)
3388     {
3389     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3390       {
3391       if (trusted_groups[i] == real_gid)
3392         trusted_caller = TRUE;
3393       else for (j = 0; j < group_count; j++)
3394         {
3395         if (trusted_groups[i] == group_list[j])
3396           { trusted_caller = TRUE; break; }
3397         }
3398       if (trusted_caller) break;
3399       }
3400     }
3401   }
3402
3403 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3404 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3405
3406 /* Only an admin user may start the daemon or force a queue run in the default
3407 configuration, but the queue run restriction can be relaxed. Only an admin
3408 user may request that a message be returned to its sender forthwith. Only an
3409 admin user may specify a debug level greater than D_v (because it might show
3410 passwords, etc. in lookup queries). Only an admin user may request a queue
3411 count. */
3412
3413 if (!admin_user)
3414   {
3415   BOOL debugset = (debug_selector & ~D_v) != 0;
3416   if (deliver_give_up || daemon_listen ||
3417      (count_queue && queue_list_requires_admin) ||
3418      (list_queue && queue_list_requires_admin) ||
3419      (queue_interval >= 0 && prod_requires_admin) ||
3420      (debugset && !running_in_test_harness))
3421     {
3422     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3423     exit(EXIT_FAILURE);
3424     }
3425   }
3426
3427 /* If the real user is not root or the exim uid, the argument for passing
3428 in an open TCP/IP connection for another message is not permitted, nor is
3429 running with the -N option for any delivery action, unless this call to exim is
3430 one that supplied an input message, or we are using a patched exim for
3431 regression testing. */
3432
3433 if (real_uid != root_uid && real_uid != exim_uid &&
3434      (continue_hostname != NULL ||
3435        (dont_deliver &&
3436          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3437        )) && !running_in_test_harness)
3438   {
3439   fprintf(stderr, "exim: Permission denied\n");
3440   return EXIT_FAILURE;
3441   }
3442
3443 /* If the caller is not trusted, certain arguments are ignored when running for
3444 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3445 Note that authority for performing certain actions on messages is tested in the
3446 queue_action() function. */
3447
3448 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3449   {
3450   sender_host_name = sender_host_address = interface_address =
3451     sender_ident = received_protocol = NULL;
3452   sender_host_port = interface_port = 0;
3453   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3454   }
3455
3456 /* If a sender host address is set, extract the optional port number off the
3457 end of it and check its syntax. Do the same thing for the interface address.
3458 Exim exits if the syntax is bad. */
3459
3460 else
3461   {
3462   if (sender_host_address != NULL)
3463     sender_host_port = check_port(sender_host_address);
3464   if (interface_address != NULL)
3465     interface_port = check_port(interface_address);
3466   }
3467
3468 /* If an SMTP message is being received check to see if the standard input is a
3469 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3470 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3471 barf. */
3472
3473 if (smtp_input)
3474   {
3475   union sockaddr_46 inetd_sock;
3476   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3477   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3478     {
3479     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3480     if (family == AF_INET || family == AF_INET6)
3481       {
3482       union sockaddr_46 interface_sock;
3483       size = sizeof(interface_sock);
3484
3485       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3486         interface_address = host_ntoa(-1, &interface_sock, NULL,
3487           &interface_port);
3488
3489       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3490
3491       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3492         {
3493         is_inetd = TRUE;
3494         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3495           NULL, &sender_host_port);
3496         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3497           "inetd is not supported when mua_wrapper is set");
3498         }
3499       else
3500         {
3501         fprintf(stderr,
3502           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3503         return EXIT_FAILURE;
3504         }
3505       }
3506     }
3507   }
3508
3509 /* If the load average is going to be needed while receiving a message, get it
3510 now for those OS that require the first call to os_getloadavg() to be done as
3511 root. There will be further calls later for each message received. */
3512
3513 #ifdef LOAD_AVG_NEEDS_ROOT
3514 if (receiving_message &&
3515       (queue_only_load >= 0 ||
3516         (is_inetd && smtp_load_reserve >= 0)
3517       ))
3518   {
3519   load_average = os_getloadavg();
3520   }
3521 #endif
3522
3523 /* The queue_only configuration option can be overridden by -odx on the command
3524 line, except that if queue_only_override is false, queue_only cannot be unset
3525 from the command line. */
3526
3527 if (queue_only_set && (queue_only_override || arg_queue_only))
3528   queue_only = arg_queue_only;
3529
3530 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3531 -or and -os. */
3532
3533 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3534 if (arg_smtp_receive_timeout >= 0)
3535   smtp_receive_timeout = arg_smtp_receive_timeout;
3536
3537 /* If Exim was started with root privilege, unless we have already removed the
3538 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3539 except when starting the daemon or doing some kind of delivery or address
3540 testing (-bt). These are the only cases when root need to be retained. We run
3541 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3542 retained only for starting the daemon. */
3543
3544 if (!unprivileged &&                      /* originally had root AND */
3545     !removed_privilege &&                 /* still got root AND      */
3546     !daemon_listen &&                     /* not starting the daemon */
3547     queue_interval <= 0 &&                /* (either kind of daemon) */
3548       (                                   /*    AND EITHER           */
3549       deliver_drop_privilege ||           /* requested unprivileged  */
3550         (                                 /*       OR                */
3551         queue_interval < 0 &&             /* not running the queue   */
3552         (msg_action_arg < 0 ||            /*       and               */
3553           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3554         (!checking || !address_test_mode) /* not address checking    */
3555         )
3556       ))
3557   {
3558   exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3559   }
3560
3561 /* When we are retaining a privileged uid, we still change to the exim gid. */
3562
3563 else setgid(exim_gid);
3564
3565 /* Handle a request to list the delivery queue */
3566
3567 if (list_queue)
3568   {
3569   set_process_info("listing the queue");
3570   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3571   exit(EXIT_SUCCESS);
3572   }
3573
3574 /* Handle a request to count the delivery queue */
3575
3576 if (count_queue)
3577   {
3578   set_process_info("counting the queue");
3579   queue_count();
3580   exit(EXIT_SUCCESS);
3581   }
3582
3583 /* Handle actions on specific messages, except for the force delivery action,
3584 which is done below. Some actions take a whole list of message ids, which
3585 are known to continue up to the end of the arguments. Others take a single
3586 message id and then operate on the recipients list. */
3587
3588 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3589   {
3590   int yield = EXIT_SUCCESS;
3591   set_process_info("acting on specified messages");
3592
3593   if (!one_msg_action)
3594     {
3595     for (i = msg_action_arg; i < argc; i++)
3596       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3597         yield = EXIT_FAILURE;
3598     }
3599
3600   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3601     recipients_arg)) yield = EXIT_FAILURE;
3602   exit(yield);
3603   }
3604
3605 /* All the modes below here require the remaining configuration sections
3606 to be read, except that we can skip over the ACL setting when delivering
3607 specific messages, or doing a queue run. (For various testing cases we could
3608 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3609 for skipping. */
3610
3611 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3612
3613 /* The configuration data will have been read into POOL_PERM because we won't
3614 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3615 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3616 configuration were read into POOL_MAIN, because we don't do any resets till
3617 later on. However, it seems right, and it does ensure that both pools get used.
3618 */
3619
3620 store_pool = POOL_MAIN;
3621
3622 /* Handle the -brt option. This is for checking out retry configurations.
3623 The next three arguments are a domain name or a complete address, and
3624 optionally two error numbers. All it does is to call the function that
3625 scans the retry configuration data. */
3626
3627 if (test_retry_arg >= 0)
3628   {
3629   retry_config *yield;
3630   int basic_errno = 0;
3631   int more_errno = 0;
3632   uschar *s1, *s2;
3633
3634   if (test_retry_arg >= argc)
3635     {
3636     printf("-brt needs a domain or address argument\n");
3637     exim_exit(EXIT_FAILURE);
3638     }
3639   s1 = argv[test_retry_arg++];
3640   s2 = NULL;
3641
3642   /* If the first argument contains no @ and no . it might be a local user
3643   or it might be a single-component name. Treat as a domain. */
3644
3645   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3646     {
3647     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3648       "being \ntreated as a one-component domain, not as a local part.\n\n",
3649       s1);
3650     }
3651
3652   /* There may be an optional second domain arg. */
3653
3654   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3655     s2 = argv[test_retry_arg++];
3656
3657   /* The final arg is an error name */
3658
3659   if (test_retry_arg < argc)
3660     {
3661     uschar *ss = argv[test_retry_arg];
3662     uschar *error =
3663       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3664     if (error != NULL)
3665       {
3666       printf("%s\n", CS error);
3667       return EXIT_FAILURE;
3668       }
3669
3670     /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3671     an error is for matching codes to the decade. Turn them into a real error
3672     code, off the decade. */
3673
3674     if (basic_errno == ERRNO_RCPT4XX)
3675       {
3676       int code = (more_errno >> 8) & 255;
3677       if (code == 255)
3678         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3679       else if (code > 100)
3680         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3681       }
3682     }
3683
3684   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3685   if (yield == NULL) printf("No retry information found\n"); else
3686     {
3687     retry_rule *r;
3688     more_errno = yield->more_errno;
3689     printf("Retry rule: %s  ", yield->pattern);
3690
3691     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3692       {
3693       printf("quota%s%s  ",
3694         (more_errno > 0)? "_" : "",
3695         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3696       }
3697     else if (yield->basic_errno == ECONNREFUSED)
3698       {
3699       printf("refused%s%s  ",
3700         (more_errno > 0)? "_" : "",
3701         (more_errno == 'M')? "MX" :
3702         (more_errno == 'A')? "A" : "");
3703       }
3704     else if (yield->basic_errno == ETIMEDOUT)
3705       {
3706       printf("timeout");
3707       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3708       more_errno &= 255;
3709       if (more_errno != 0) printf("_%s",
3710         (more_errno == 'M')? "MX" : "A");
3711       printf("  ");
3712       }
3713     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3714       printf("auth_failed  ");
3715     else printf("*  ");
3716
3717     for (r = yield->rules; r != NULL; r = r->next)
3718       {
3719       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3720       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3721       if (r->rule == 'G')
3722         {
3723         int x = r->p2;
3724         int f = x % 1000;
3725         int d = 100;
3726         printf(",%d.", x/1000);
3727         do
3728           {
3729           printf("%d", f/d);
3730           f %= d;
3731           d /= 10;
3732           }
3733         while (f != 0);
3734         }
3735       printf("; ");
3736       }
3737
3738     printf("\n");
3739     }
3740   exim_exit(EXIT_SUCCESS);
3741   }
3742
3743 /* Handle a request to list one or more configuration options */
3744
3745 if (list_options)
3746   {
3747   set_process_info("listing variables");
3748   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3749     else for (i = recipients_arg; i < argc; i++)
3750       {
3751       if (i < argc - 1 &&
3752           (Ustrcmp(argv[i], "router") == 0 ||
3753            Ustrcmp(argv[i], "transport") == 0 ||
3754            Ustrcmp(argv[i], "authenticator") == 0))
3755         {
3756         readconf_print(argv[i+1], argv[i]);
3757         i++;
3758         }
3759       else readconf_print(argv[i], NULL);
3760       }
3761   exim_exit(EXIT_SUCCESS);
3762   }
3763
3764
3765 /* Handle a request to deliver one or more messages that are already on the
3766 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3767 is typically used for a small number when prodding by hand (when the option
3768 forced_delivery will be set) or when re-execing to regain root privilege.
3769 Each message delivery must happen in a separate process, so we fork a process
3770 for each one, and run them sequentially so that debugging output doesn't get
3771 intertwined, and to avoid spawning too many processes if a long list is given.
3772 However, don't fork for the last one; this saves a process in the common case
3773 when Exim is called to deliver just one message. */
3774
3775 if (msg_action_arg > 0)
3776   {
3777   if (prod_requires_admin && !admin_user)
3778     {
3779     fprintf(stderr, "exim: Permission denied\n");
3780     exim_exit(EXIT_FAILURE);
3781     }
3782   set_process_info("delivering specified messages");
3783   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3784   for (i = msg_action_arg; i < argc; i++)
3785     {
3786     int status;
3787     pid_t pid;
3788     if (i == argc - 1)
3789       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3790     else if ((pid = fork()) == 0)
3791       {
3792       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3793       _exit(EXIT_SUCCESS);
3794       }
3795     else if (pid < 0)
3796       {
3797       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3798         strerror(errno));
3799       exim_exit(EXIT_FAILURE);
3800       }
3801     else wait(&status);
3802     }
3803   exim_exit(EXIT_SUCCESS);
3804   }
3805
3806
3807 /* If only a single queue run is requested, without SMTP listening, we can just
3808 turn into a queue runner, with an optional starting message id. */
3809
3810 if (queue_interval == 0 && !daemon_listen)
3811   {
3812   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3813     (start_queue_run_id == NULL)? US"" : US" starting at ",
3814     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3815     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
3816     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
3817   set_process_info("running the queue (single queue run)");
3818   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3819   exim_exit(EXIT_SUCCESS);
3820   }
3821
3822
3823 /* Find the login name of the real user running this process. This is always
3824 needed when receiving a message, because it is written into the spool file. It
3825 may also be used to construct a from: or a sender: header, and in this case we
3826 need the user's full name as well, so save a copy of it, checked for RFC822
3827 syntax and munged if necessary, if it hasn't previously been set by the -F
3828 argument. We may try to get the passwd entry more than once, in case NIS or
3829 other delays are in evidence. Save the home directory for use in filter testing
3830 (only). */
3831
3832 for (i = 0;;)
3833   {
3834   if ((pw = getpwuid(real_uid)) != NULL)
3835     {
3836     originator_login = string_copy(US pw->pw_name);
3837     originator_home = string_copy(US pw->pw_dir);
3838
3839     /* If user name has not been set by -F, set it from the passwd entry
3840     unless -f has been used to set the sender address by a trusted user. */
3841
3842     if (originator_name == NULL)
3843       {
3844       if (sender_address == NULL ||
3845            (!trusted_caller && filter_test == FTEST_NONE))
3846         {
3847         uschar *name = US pw->pw_gecos;
3848         uschar *amp = Ustrchr(name, '&');
3849         uschar buffer[256];
3850
3851         /* Most Unix specify that a '&' character in the gecos field is
3852         replaced by a copy of the login name, and some even specify that
3853         the first character should be upper cased, so that's what we do. */
3854
3855         if (amp != NULL)
3856           {
3857           int loffset;
3858           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3859             amp - name, name, &loffset, originator_login, amp + 1);
3860           buffer[loffset] = toupper(buffer[loffset]);
3861           name = buffer;
3862           }
3863
3864         /* If a pattern for matching the gecos field was supplied, apply
3865         it and then expand the name string. */
3866
3867         if (gecos_pattern != NULL && gecos_name != NULL)
3868           {
3869           const pcre *re;
3870           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3871
3872           if (regex_match_and_setup(re, name, 0, -1))
3873             {
3874             uschar *new_name = expand_string(gecos_name);
3875             expand_nmax = -1;
3876             if (new_name != NULL)
3877               {
3878               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3879                 "gecos field \"%s\"\n", new_name, name);
3880               name = new_name;
3881               }
3882             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3883               "\"%s\": %s\n", gecos_name, expand_string_message);
3884             }
3885           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3886             "gecos field \"%s\"\n", gecos_pattern, name);
3887           store_free((void *)re);
3888           }
3889         originator_name = string_copy(name);
3890         }
3891
3892       /* A trusted caller has used -f but not -F */
3893
3894       else originator_name = US"";
3895       }
3896
3897     /* Break the retry loop */
3898
3899     break;
3900     }
3901
3902   if (++i > finduser_retries) break;
3903   sleep(1);
3904   }
3905
3906 /* If we cannot get a user login, log the incident and give up, unless the
3907 configuration specifies something to use. When running in the test harness,
3908 any setting of unknown_login overrides the actual login name. */
3909
3910 if (originator_login == NULL || running_in_test_harness)
3911   {
3912   if (unknown_login != NULL)
3913     {
3914     originator_login = expand_string(unknown_login);
3915     if (originator_name == NULL && unknown_username != NULL)
3916       originator_name = expand_string(unknown_username);
3917     if (originator_name == NULL) originator_name = US"";
3918     }
3919   if (originator_login == NULL)
3920     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3921       (int)real_uid);
3922   }
3923
3924 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3925 RFC822 address.*/
3926
3927 originator_name = string_copy(parse_fix_phrase(originator_name,
3928   Ustrlen(originator_name), big_buffer, big_buffer_size));
3929
3930 /* If a message is created by this call of Exim, the uid/gid of its originator
3931 are those of the caller. These values are overridden if an existing message is
3932 read in from the spool. */
3933
3934 originator_uid = real_uid;
3935 originator_gid = real_gid;
3936
3937 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3938   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3939
3940 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3941 returns. We leave this till here so that the originator_ fields are available
3942 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3943 mode. */
3944
3945 if (daemon_listen || queue_interval > 0)
3946   {
3947   if (mua_wrapper)
3948     {
3949     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3950     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3951       "mua_wrapper is set");
3952     }
3953   daemon_go();
3954   }
3955
3956 /* If the sender ident has not been set (by a trusted caller) set it to
3957 the caller. This will get overwritten below for an inetd call. If a trusted
3958 caller has set it empty, unset it. */
3959
3960 if (sender_ident == NULL) sender_ident = originator_login;
3961   else if (sender_ident[0] == 0) sender_ident = NULL;
3962
3963 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3964 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3965 originator_* variables set. */
3966
3967 if (test_rewrite_arg >= 0)
3968   {
3969   really_exim = FALSE;
3970   if (test_rewrite_arg >= argc)
3971     {
3972     printf("-brw needs an address argument\n");
3973     exim_exit(EXIT_FAILURE);
3974     }
3975   rewrite_test(argv[test_rewrite_arg]);
3976   exim_exit(EXIT_SUCCESS);
3977   }
3978
3979 /* A locally-supplied message is considered to be coming from a local user
3980 unless a trusted caller supplies a sender address with -f, or is passing in the
3981 message via SMTP (inetd invocation or otherwise). */
3982
3983 if ((sender_address == NULL && !smtp_input) ||
3984     (!trusted_caller && filter_test == FTEST_NONE))
3985   {
3986   sender_local = TRUE;
3987
3988   /* A trusted caller can supply authenticated_sender and authenticated_id
3989   via -oMas and -oMai and if so, they will already be set. */
3990
3991   if (authenticated_sender == NULL)
3992     authenticated_sender = string_sprintf("%s@%s", originator_login,
3993       qualify_domain_sender);
3994   if (authenticated_id == NULL) authenticated_id = originator_login;
3995   }
3996
3997 /* Trusted callers are always permitted to specify the sender address.
3998 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3999 is specified is the empty address. However, if a trusted caller does not
4000 specify a sender address for SMTP input, we leave sender_address unset. This
4001 causes the MAIL commands to be honoured. */
4002
4003 if ((!smtp_input && sender_address == NULL) ||
4004     !receive_check_set_sender(sender_address))
4005   {
4006   /* Either the caller is not permitted to set a general sender, or this is
4007   non-SMTP input and the trusted caller has not set a sender. If there is no
4008   sender, or if a sender other than <> is set, override with the originator's
4009   login (which will get qualified below), except when checking things. */
4010
4011   if (sender_address == NULL             /* No sender_address set */
4012        ||                                /*         OR            */
4013        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4014        !checking &&                      /* Not running tests, AND */
4015        filter_test == FTEST_NONE))       /* Not testing a filter */
4016     {
4017     sender_address = originator_login;
4018     sender_address_forced = FALSE;
4019     sender_address_domain = 0;
4020     }
4021   }
4022
4023 /* Remember whether an untrusted caller set the sender address */
4024
4025 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4026
4027 /* Ensure that the sender address is fully qualified unless it is the empty
4028 address, which indicates an error message, or doesn't exist (root caller, smtp
4029 interface, no -f argument). */
4030
4031 if (sender_address != NULL && sender_address[0] != 0 &&
4032     sender_address_domain == 0)
4033   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4034     qualify_domain_sender);
4035
4036 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4037
4038 /* Handle a request to verify a list of addresses, or test them for delivery.
4039 This must follow the setting of the sender address, since routers can be
4040 predicated upon the sender. If no arguments are given, read addresses from
4041 stdin. Set debug_level to at least D_v to get full output for address testing.
4042 */
4043
4044 if (verify_address_mode || address_test_mode)
4045   {
4046   int exit_value = 0;
4047   int flags = vopt_qualify;
4048
4049   if (verify_address_mode)
4050     {
4051     if (!verify_as_sender) flags |= vopt_is_recipient;
4052     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4053     }
4054
4055   else
4056     {
4057     flags |= vopt_is_recipient;
4058     debug_selector |= D_v;
4059     debug_file = stderr;
4060     debug_fd = fileno(debug_file);
4061     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4062     }
4063
4064   if (recipients_arg < argc)
4065     {
4066     while (recipients_arg < argc)
4067       {
4068       uschar *s = argv[recipients_arg++];
4069       while (*s != 0)
4070         {
4071         BOOL finished = FALSE;
4072         uschar *ss = parse_find_address_end(s, FALSE);
4073         if (*ss == ',') *ss = 0; else finished = TRUE;
4074         test_address(s, flags, &exit_value);
4075         s = ss;
4076         if (!finished)
4077           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4078         }
4079       }
4080     }
4081
4082   else for (;;)
4083     {
4084     uschar *s = get_stdinput(NULL, NULL);
4085     if (s == NULL) break;
4086     test_address(s, flags, &exit_value);
4087     }
4088
4089   route_tidyup();
4090   exim_exit(exit_value);
4091   }
4092
4093 /* Handle expansion checking */
4094
4095 if (expansion_test)
4096   {
4097   if (recipients_arg < argc)
4098     {
4099     while (recipients_arg < argc)
4100       {
4101       uschar *s = argv[recipients_arg++];
4102       uschar *ss = expand_string(s);
4103       if (ss == NULL)
4104         printf ("Failed: %s\n", expand_string_message);
4105       else printf("%s\n", CS ss);
4106       }
4107     }
4108
4109   /* Read stdin */
4110
4111   else
4112     {
4113     char *(*fn_readline)(char *) = NULL;
4114     char *(*fn_addhist)(char *) = NULL;
4115
4116     #ifdef USE_READLINE
4117     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4118     #endif
4119
4120     for (;;)
4121       {
4122       uschar *ss;
4123       uschar *source = get_stdinput(fn_readline, fn_addhist);
4124       if (source == NULL) break;
4125       ss = expand_string(source);
4126       if (ss == NULL)
4127         printf ("Failed: %s\n", expand_string_message);
4128       else printf("%s\n", CS ss);
4129       }
4130
4131     #ifdef USE_READLINE
4132     if (dlhandle != NULL) dlclose(dlhandle);
4133     #endif
4134     }
4135
4136   exim_exit(EXIT_SUCCESS);
4137   }
4138
4139
4140 /* The active host name is normally the primary host name, but it can be varied
4141 for hosts that want to play several parts at once. We need to ensure that it is
4142 set for host checking, and for receiving messages. */
4143
4144 smtp_active_hostname = primary_hostname;
4145 if (raw_active_hostname != NULL)
4146   {
4147   uschar *nah = expand_string(raw_active_hostname);
4148   if (nah == NULL)
4149     {
4150     if (!expand_string_forcedfail)
4151       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4152         "(smtp_active_hostname): %s", raw_active_hostname,
4153         expand_string_message);
4154     }
4155   else if (nah[0] != 0) smtp_active_hostname = nah;
4156   }
4157
4158 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4159 given IP address so that the blocking and relay configuration can be tested. An
4160 RFC 1413 call is made only if we are running in the test harness and an
4161 incoming interface and both ports are specified, because there is no TCP/IP
4162 call to find the ident for. */
4163
4164 if (host_checking)
4165   {
4166   int x[4];
4167   int size;
4168
4169   sender_ident = NULL;
4170   if (running_in_test_harness && sender_host_port != 0 &&
4171       interface_address != NULL && interface_port != 0)
4172     verify_get_ident(1413);
4173
4174   /* In case the given address is a non-canonical IPv6 address, canonicize
4175   it. The code works for both IPv4 and IPv6, as it happens. */
4176
4177   size = host_aton(sender_host_address, x);
4178   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4179   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4180
4181   /* Now set up for testing */
4182
4183   host_build_sender_fullhost();
4184   smtp_input = TRUE;
4185   smtp_in = stdin;
4186   smtp_out = stdout;
4187   sender_local = FALSE;
4188   sender_host_notsocket = TRUE;
4189   debug_file = stderr;
4190   debug_fd = fileno(debug_file);
4191   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4192     "**** but without any ident (RFC 1413) callback.\n"
4193     "**** This is not for real!\n\n",
4194       sender_host_address);
4195
4196   if (verify_check_host(&hosts_connection_nolog) == OK)
4197     log_write_selector &= ~L_smtp_connection;
4198   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4199
4200   if (smtp_start_session())
4201     {
4202     reset_point = store_get(0);
4203     for (;;)
4204       {
4205       store_reset(reset_point);
4206       if (smtp_setup_msg() <= 0) break;
4207       if (!receive_msg(FALSE)) break;
4208       }
4209     }
4210   exim_exit(EXIT_SUCCESS);
4211   }
4212
4213
4214 /* Arrange for message reception if recipients or SMTP were specified;
4215 otherwise complain unless a version print (-bV) happened or this is a filter
4216 verification test. In the former case, show the configuration file name. */
4217
4218 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4219   {
4220   if (version_printed)
4221     {
4222     printf("Configuration file is %s\n", config_main_filename);
4223     return EXIT_SUCCESS;
4224     }
4225   if (filter_test == FTEST_NONE)
4226     {
4227     fprintf(stderr,
4228 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4229 "not directly from a shell command line. Options and/or arguments control\n"
4230 "what it does when called. For a list of options, see the Exim documentation.\n");
4231     return EXIT_FAILURE;
4232     }
4233   }
4234
4235
4236 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4237 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4238 that we are not called from inetd, because that is rejected above. The
4239 following configuration settings are forced here:
4240
4241   (1) Synchronous delivery (-odi)
4242   (2) Errors to stderr (-oep == -oeq)
4243   (3) No parallel remote delivery
4244   (4) Unprivileged delivery
4245
4246 We don't force overall queueing options because there are several of them;
4247 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4248 to override any SMTP queueing. */
4249
4250 if (mua_wrapper)
4251   {
4252   synchronous_delivery = TRUE;
4253   arg_error_handling = ERRORS_STDERR;
4254   remote_max_parallel = 1;
4255   deliver_drop_privilege = TRUE;
4256   queue_smtp = FALSE;
4257   queue_smtp_domains = NULL;
4258   }
4259
4260
4261 /* Prepare to accept one or more new messages on the standard input. When a
4262 message has been read, its id is returned in message_id[]. If doing immediate
4263 delivery, we fork a delivery process for each received message, except for the
4264 last one, where we can save a process switch.
4265
4266 It is only in non-smtp mode that error_handling is allowed to be changed from
4267 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4268 sendmail error modes other than -oem ever actually used? Later: yes.) */
4269
4270 if (!smtp_input) error_handling = arg_error_handling;
4271
4272 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4273 logging being sent down the socket and make an identd call to get the
4274 sender_ident. */
4275
4276 else if (is_inetd)
4277   {
4278   (void)fclose(stderr);
4279   exim_nullstd();                       /* Re-open to /dev/null */
4280   verify_get_ident(IDENT_PORT);
4281   host_build_sender_fullhost();
4282   set_process_info("handling incoming connection from %s via inetd",
4283     sender_fullhost);
4284   }
4285
4286 /* If the sender host address has been set, build sender_fullhost if it hasn't
4287 already been done (which it will have been for inetd). This caters for the
4288 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4289 so that the test for IP options is skipped for -bs input. */
4290
4291 if (sender_host_address != NULL && sender_fullhost == NULL)
4292   {
4293   host_build_sender_fullhost();
4294   set_process_info("handling incoming connection from %s via -oMa",
4295     sender_fullhost);
4296   sender_host_notsocket = TRUE;
4297   }
4298
4299 /* Otherwise, set the sender host as unknown except for inetd calls. This
4300 prevents host checking in the case of -bs not from inetd and also for -bS. */
4301
4302 else if (!is_inetd) sender_host_unknown = TRUE;
4303
4304 /* If stdout does not exist, then dup stdin to stdout. This can happen
4305 if exim is started from inetd. In this case fd 0 will be set to the socket,
4306 but fd 1 will not be set. This also happens for passed SMTP channels. */
4307
4308 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4309
4310 /* Set up the incoming protocol name and the state of the program. Root
4311 is allowed to force received protocol via the -oMr option above, and if we are
4312 in a non-local SMTP state it means we have come via inetd and the process info
4313 has already been set up. We don't set received_protocol here for smtp input,
4314 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4315
4316 if (smtp_input)
4317   {
4318   if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4319     sender_address);
4320   }
4321 else
4322   {
4323   if (received_protocol == NULL)
4324     received_protocol = string_sprintf("local%s", called_as);
4325   set_process_info("accepting a local non-SMTP message from <%s>",
4326     sender_address);
4327   }
4328
4329 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4330 set) */
4331
4332 queue_check_only();
4333 local_queue_only = queue_only;
4334
4335 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4336 the spool if so configured. On failure, we must not attempt to send an error
4337 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4338 error code is given.) */
4339
4340 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4341   {
4342   fprintf(stderr, "exim: insufficient disk space\n");
4343   return EXIT_FAILURE;
4344   }
4345
4346 /* If this is smtp input of any kind, handle the start of the SMTP
4347 session. */
4348
4349 if (smtp_input)
4350   {
4351   smtp_in = stdin;
4352   smtp_out = stdout;
4353   if (verify_check_host(&hosts_connection_nolog) == OK)
4354     log_write_selector &= ~L_smtp_connection;
4355   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4356   if (!smtp_start_session())
4357     {
4358     mac_smtp_fflush();
4359     exim_exit(EXIT_SUCCESS);
4360     }
4361   }
4362
4363 /* Otherwise, set up the input size limit here */
4364
4365 else
4366   {
4367   thismessage_size_limit = expand_string_integer(message_size_limit);
4368   if (thismessage_size_limit < 0)
4369     {
4370     if (thismessage_size_limit == -1)
4371       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4372         "message_size_limit: %s", expand_string_message);
4373     else
4374       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4375         "message_size_limit: %s", expand_string_message);
4376     }
4377   }
4378
4379 /* Loop for several messages when reading SMTP input. If we fork any child
4380 processes, we don't want to wait for them unless synchronous delivery is
4381 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4382 same as SIG_DFL, despite the fact that documentation often lists the default as
4383 "ignore". This is a confusing area. This is what I know:
4384
4385 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4386 processes that complete simply to go away without ever becoming defunct. You
4387 can't then wait for them - but we don't want to wait for them in the
4388 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4389 happen for all OS (e.g. *BSD is different).
4390
4391 But that's not the end of the story. Some (many? all?) systems have the
4392 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4393 has by default, so it seems that the difference is merely one of default
4394 (compare restarting vs non-restarting signals).
4395
4396 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4397 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4398 of the loop below. Paranoia rules.
4399
4400 February 2003: That's *still* not the end of the story. There are now versions
4401 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4402 process then calls waitpid(), a grumble is written to the system log, because
4403 this is logically inconsistent. In other words, it doesn't like the paranoia.
4404 As a consequenc of this, the waitpid() below is now excluded if we are sure
4405 that SIG_IGN works. */
4406
4407 if (!synchronous_delivery)
4408   {
4409   #ifdef SA_NOCLDWAIT
4410   struct sigaction act;
4411   act.sa_handler = SIG_IGN;
4412   sigemptyset(&(act.sa_mask));
4413   act.sa_flags = SA_NOCLDWAIT;
4414   sigaction(SIGCHLD, &act, NULL);
4415   #else
4416   signal(SIGCHLD, SIG_IGN);
4417   #endif
4418   }
4419
4420 /* Save the current store pool point, for resetting at the start of
4421 each message, and save the real sender address, if any. */
4422
4423 reset_point = store_get(0);
4424 real_sender_address = sender_address;
4425
4426 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4427 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4428 collapsed). */
4429
4430 while (more)
4431   {
4432   store_reset(reset_point);
4433   message_id[0] = 0;
4434
4435   /* In the SMTP case, we have to handle the initial SMTP input and build the
4436   recipients list, before calling receive_msg() to read the message proper.
4437   Whatever sender address is actually given in the SMTP transaction is
4438   actually ignored for local senders - we use the actual sender, which is
4439   normally either the underlying user running this process or a -f argument
4440   provided by a trusted caller. It is saved in real_sender_address.
4441
4442   However, if this value is NULL, we are dealing with a trusted caller when
4443   -f was not used; in this case, the SMTP sender is allowed to stand.
4444
4445   Also, if untrusted_set_sender is set, we permit sender addresses that match
4446   anything in its list.
4447
4448   The variable raw_sender_address holds the sender address before rewriting. */
4449
4450   if (smtp_input)
4451     {
4452     int rc;
4453     if ((rc = smtp_setup_msg()) > 0)
4454       {
4455       if (real_sender_address != NULL &&
4456           !receive_check_set_sender(sender_address))
4457         {
4458         sender_address = raw_sender = real_sender_address;
4459         sender_address_unrewritten = NULL;
4460         }
4461       more = receive_msg(extract_recipients);
4462       if (message_id[0] == 0)
4463         {
4464         if (more) continue;
4465         exim_exit(EXIT_FAILURE);
4466         }
4467       }
4468     else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4469     }
4470
4471   /* In the non-SMTP case, we have all the information from the command
4472   line, but must process it in case it is in the more general RFC822
4473   format, and in any case, to detect syntax errors. Also, it appears that
4474   the use of comma-separated lists as single arguments is common, so we
4475   had better support them. */
4476
4477   else
4478     {
4479     int i;
4480     int rcount = 0;
4481     int count = argc - recipients_arg;
4482     uschar **list = argv + recipients_arg;
4483
4484     /* These options cannot be changed dynamically for non-SMTP messages */
4485
4486     active_local_sender_retain = local_sender_retain;
4487     active_local_from_check = local_from_check;
4488
4489     /* Save before any rewriting */
4490
4491     raw_sender = string_copy(sender_address);
4492
4493     /* Loop for each argument */
4494
4495     for (i = 0; i < count; i++)
4496       {
4497       int start, end, domain;
4498       uschar *errmess;
4499       uschar *s = list[i];
4500
4501       /* Loop for each comma-separated address */
4502
4503       while (*s != 0)
4504         {
4505         BOOL finished = FALSE;
4506         uschar *recipient;
4507         uschar *ss = parse_find_address_end(s, FALSE);
4508
4509         if (*ss == ',') *ss = 0; else finished = TRUE;
4510
4511         /* Check max recipients - if -t was used, these aren't recipients */
4512
4513         if (recipients_max > 0 && ++rcount > recipients_max &&
4514             !extract_recipients)
4515           {
4516           if (error_handling == ERRORS_STDERR)
4517             {
4518             fprintf(stderr, "exim: too many recipients\n");
4519             exim_exit(EXIT_FAILURE);
4520             }
4521           else
4522             {
4523             return
4524               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4525                 errors_sender_rc : EXIT_FAILURE;
4526             }
4527           }
4528
4529         recipient =
4530           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4531
4532         if (domain == 0 && !allow_unqualified_recipient)
4533           {
4534           recipient = NULL;
4535           errmess = US"unqualified recipient address not allowed";
4536           }
4537
4538         if (recipient == NULL)
4539           {
4540           if (error_handling == ERRORS_STDERR)
4541             {
4542             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4543               string_printing(list[i]), errmess);
4544             exim_exit(EXIT_FAILURE);
4545             }
4546           else
4547             {
4548             error_block eblock;
4549             eblock.next = NULL;
4550             eblock.text1 = string_printing(list[i]);
4551             eblock.text2 = errmess;
4552             return
4553               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4554                 errors_sender_rc : EXIT_FAILURE;
4555             }
4556           }
4557
4558         receive_add_recipient(recipient, -1);
4559         s = ss;
4560         if (!finished)
4561           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4562         }
4563       }
4564
4565     /* Show the recipients when debugging */
4566
4567     DEBUG(D_receive)
4568       {
4569       int i;
4570       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4571       if (recipients_list != NULL)
4572         {
4573         debug_printf("Recipients:\n");
4574         for (i = 0; i < recipients_count; i++)
4575           debug_printf("  %s\n", recipients_list[i].address);
4576         }
4577       }
4578
4579     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4580     will just read the headers for the message, and not write anything onto the
4581     spool. */
4582
4583     message_ended = END_NOTENDED;
4584     more = receive_msg(extract_recipients);
4585
4586     /* more is always FALSE here (not SMTP message) when reading a message
4587     for real; when reading the headers of a message for filter testing,
4588     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4589
4590     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4591     }  /* Non-SMTP message reception */
4592
4593   /* If this is a filter testing run, there are headers in store, but
4594   no message on the spool. Run the filtering code in testing mode, setting
4595   the domain to the qualify domain and the local part to the current user,
4596   unless they have been set by options. The prefix and suffix are left unset
4597   unless specified. The the return path is set to to the sender unless it has
4598   already been set from a return-path header in the message. */
4599
4600   if (filter_test != FTEST_NONE)
4601     {
4602     deliver_domain = (ftest_domain != NULL)?
4603       ftest_domain : qualify_domain_recipient;
4604     deliver_domain_orig = deliver_domain;
4605     deliver_localpart = (ftest_localpart != NULL)?
4606       ftest_localpart : originator_login;
4607     deliver_localpart_orig = deliver_localpart;
4608     deliver_localpart_prefix = ftest_prefix;
4609     deliver_localpart_suffix = ftest_suffix;
4610     deliver_home = originator_home;
4611
4612     if (return_path == NULL)
4613       {
4614       printf("Return-path copied from sender\n");
4615       return_path = string_copy(sender_address);
4616       }
4617     else
4618       {
4619       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4620       }
4621     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4622
4623     receive_add_recipient(
4624       string_sprintf("%s%s%s@%s",
4625         (ftest_prefix == NULL)? US"" : ftest_prefix,
4626         deliver_localpart,
4627         (ftest_suffix == NULL)? US"" : ftest_suffix,
4628         deliver_domain), -1);
4629
4630     printf("Recipient   = %s\n", recipients_list[0].address);
4631     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4632     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4633
4634     (void)chdir("/");   /* Get away from wherever the user is running this from */
4635
4636     /* Now we run either a system filter test, or a user filter test, or both.
4637     In the latter case, headers added by the system filter will persist and be
4638     available to the user filter. We need to copy the filter variables
4639     explicitly. */
4640
4641     if ((filter_test & FTEST_SYSTEM) != 0)
4642       {
4643       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4644         exim_exit(EXIT_FAILURE);
4645       }
4646
4647     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4648
4649     if ((filter_test & FTEST_USER) != 0)
4650       {
4651       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4652         exim_exit(EXIT_FAILURE);
4653       }
4654
4655     exim_exit(EXIT_SUCCESS);
4656     }
4657
4658   /* Else act on the result of message reception. We should not get here unless
4659   message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4660   TRUE. If it is not, check on the number of messages received in this
4661   connection. If that's OK and queue_only_load is set, check that the load
4662   average is below it. If it is not, set local_queue_only TRUE. Note that it
4663   then remains this way for any subsequent messages on the same SMTP connection.
4664   This is a deliberate choice; even though the load average may fall, it
4665   doesn't seem right to deliver later messages on the same call when not
4666   delivering earlier ones. */
4667
4668   if (!local_queue_only)
4669     {
4670     if (smtp_accept_queue_per_connection > 0 &&
4671         receive_messagecount > smtp_accept_queue_per_connection)
4672       {
4673       local_queue_only = TRUE;
4674       queue_only_reason = 2;
4675       }
4676     else if (queue_only_load >= 0)
4677       {
4678       local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4679       if (local_queue_only) queue_only_reason = 3;
4680       }
4681     }
4682
4683   /* If running as an MUA wrapper, all queueing options and freezing options
4684   are ignored. */
4685
4686   if (mua_wrapper)
4687     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4688
4689   /* Log the queueing here, when it will get a message id attached, but
4690   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4691   connections). */
4692
4693   if (local_queue_only) switch(queue_only_reason)
4694     {
4695     case 2:
4696     log_write(L_delay_delivery,
4697               LOG_MAIN, "no immediate delivery: more than %d messages "
4698       "received in one connection", smtp_accept_queue_per_connection);
4699     break;
4700
4701     case 3:
4702     log_write(L_delay_delivery,
4703               LOG_MAIN, "no immediate delivery: load average %.2f",
4704               (double)load_average/1000.0);
4705     break;
4706     }
4707
4708   /* Else do the delivery unless the ACL or local_scan() called for queue only
4709   or froze the message. Always deliver in a separate process. A fork failure is
4710   not a disaster, as the delivery will eventually happen on a subsequent queue
4711   run. The search cache must be tidied before the fork, as the parent will
4712   do it before exiting. The child will trigger a lookup failure and
4713   thereby defer the delivery if it tries to use (for example) a cached ldap
4714   connection that the parent has called unbind on. */
4715
4716   else if (!queue_only_policy && !deliver_freeze)
4717     {
4718     pid_t pid;
4719     search_tidyup();
4720
4721     if ((pid = fork()) == 0)
4722       {
4723       int rc;
4724       close_unwanted();      /* Close unwanted file descriptors and TLS */
4725       exim_nullstd();        /* Ensure std{in,out,err} exist */
4726
4727       /* Occasionally in the test harness we don't have synchronous delivery
4728       set (can happen with bounces). In that case, let the old process finish
4729       before continuing, to keep the debug output the same. */
4730
4731       if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4732
4733       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4734       mode, deliver_drop_privilege is forced TRUE). */
4735
4736       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4737         {
4738         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4739           message_id);
4740         /* Control does not return here. */
4741         }
4742
4743       /* No need to re-exec */
4744
4745       rc = deliver_message(message_id, FALSE, FALSE);
4746       search_tidyup();
4747       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4748         EXIT_SUCCESS : EXIT_FAILURE);
4749       }
4750
4751     if (pid < 0)
4752       {
4753       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4754         "process: %s", strerror(errno));
4755       }
4756
4757     /* In the parent, wait if synchronous delivery is required. This will
4758     always be the case in MUA wrapper mode. */
4759
4760     else if (synchronous_delivery)
4761       {
4762       int status;
4763       while (wait(&status) != pid);
4764       if ((status & 0x00ff) != 0)
4765         log_write(0, LOG_MAIN|LOG_PANIC,
4766           "process %d crashed with signal %d while delivering %s",
4767           (int)pid, status & 0x00ff, message_id);
4768       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4769       }
4770     }
4771
4772   /* The loop will repeat if more is TRUE. If we do not know know that the OS
4773   automatically reaps children (see comments above the loop), clear away any
4774   finished subprocesses here, in case there are lots of messages coming in
4775   from the same source. */
4776
4777   #ifndef SIG_IGN_WORKS
4778   while (waitpid(-1, NULL, WNOHANG) > 0);
4779   #endif
4780   }
4781
4782 exim_exit(EXIT_SUCCESS);   /* Never returns */
4783 return 0;                  /* To stop compiler warning */
4784 }
4785
4786 /* End of exim.c */