src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.28 2005/09/12 10:08:54 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2005 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10
  11 /* The main function: entry point, initialization, and high-level control.
  12 Also a few functions that don't naturally fit elsewhere. */
  13
  14
  15 #include "exim.h"
  16
  17
  18
  19 /*************************************************
  20 *      Function interface to store functions     *
  21 *************************************************/
  22
  23 /* We need some real functions to pass to the PCRE regular expression library
  24 for store allocation via Exim's store manager. The normal calls are actually
  25 macros that pass over location information to make tracing easier. These
  26 functions just interface to the standard macro calls. A good compiler will
  27 optimize out the tail recursion and so not make them too expensive. There
  28 are two sets of functions; one for use when we want to retain the compiled
  29 regular expression for a long time; the other for short-term use. */
  30
  31 static void *
  32 function_store_get(size_t size)
  33 {
  34 return store_get((int)size);
  35 }
  36
  37 static void
  38 function_dummy_free(void *block) { block = block; }
  39
  40 static void *
  41 function_store_malloc(size_t size)
  42 {
  43 return store_malloc((int)size);
  44 }
  45
  46 static void
  47 function_store_free(void *block)
  48 {
  49 store_free(block);
  50 }
  51
  52
  53
  54
  55 /*************************************************
  56 *  Compile regular expression and panic on fail  *
  57 *************************************************/
  58
  59 /* This function is called when failure to compile a regular expression leads
  60 to a panic exit. In other cases, pcre_compile() is called directly. In many
  61 cases where this function is used, the results of the compilation are to be
  62 placed in long-lived store, so we temporarily reset the store management
  63 functions that PCRE uses if the use_malloc flag is set.
  64
  65 Argument:
  66   pattern     the pattern to compile
  67   caseless    TRUE if caseless matching is required
  68   use_malloc  TRUE if compile into malloc store
  69
  70 Returns:      pointer to the compiled pattern
  71 */
  72
  73 const pcre *
  74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
  75 {
  76 int offset;
  77 int options = PCRE_COPT;
  78 const pcre *yield;
  79 const uschar *error;
  80 if (use_malloc)
  81   {
  82   pcre_malloc = function_store_malloc;
  83   pcre_free = function_store_free;
  84   }
  85 if (caseless) options |= PCRE_CASELESS;
  86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
  87 pcre_malloc = function_store_get;
  88 pcre_free = function_dummy_free;
  89 if (yield == NULL)
  90   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
  91     "%s at offset %d while compiling %s", error, offset, pattern);
  92 return yield;
  93 }
  94
  95
  96
  97
  98 /*************************************************
  99 *   Execute regular expression and set strings   *
 100 *************************************************/
 101
 102 /* This function runs a regular expression match, and sets up the pointers to
 103 the matched substrings.
 104
 105 Arguments:
 106   re          the compiled expression
 107   subject     the subject string
 108   options     additional PCRE options
 109   setup       if < 0 do full setup
 110               if >= 0 setup from setup+1 onwards,
 111                 excluding the full matched string
 112
 113 Returns:      TRUE or FALSE
 114 */
 115
 116 BOOL
 117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
 118 {
 119 int ovector[3*(EXPAND_MAXN+1)];
 120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
 121   PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
 122 BOOL yield = n >= 0;
 123 if (n == 0) n = EXPAND_MAXN + 1;
 124 if (yield)
 125   {
 126   int nn;
 127   expand_nmax = (setup < 0)? 0 : setup + 1;
 128   for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
 129     {
 130     expand_nstring[expand_nmax] = subject + ovector[nn];
 131     expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
 132     }
 133   expand_nmax--;
 134   }
 135 return yield;
 136 }
 137
 138
 139
 140
 141 /*************************************************
 142 *             Handler for SIGUSR1                *
 143 *************************************************/
 144
 145 /* SIGUSR1 causes any exim process to write to the process log details of
 146 what it is currently doing. It will only be used if the OS is capable of
 147 setting up a handler that causes automatic restarting of any system call
 148 that is in progress at the time.
 149
 150 Argument: the signal number (SIGUSR1)
 151 Returns:  nothing
 152 */
 153
 154 static void
 155 usr1_handler(int sig)
 156 {
 157 sig = sig;      /* Keep picky compilers happy */
 158 log_write(0, LOG_PROCESS, "%s", process_info);
 159 log_close_all();
 160 os_restarting_signal(SIGUSR1, usr1_handler);
 161 }
 162
 163
 164
 165 /*************************************************
 166 *             Timeout handler                    *
 167 *************************************************/
 168
 169 /* This handler is enabled most of the time that Exim is running. The handler
 170 doesn't actually get used unless alarm() has been called to set a timer, to
 171 place a time limit on a system call of some kind. When the handler is run, it
 172 re-enables itself.
 173
 174 There are some other SIGALRM handlers that are used in special cases when more
 175 than just a flag setting is required; for example, when reading a message's
 176 input. These are normally set up in the code module that uses them, and the
 177 SIGALRM handler is reset to this one afterwards.
 178
 179 Argument: the signal value (SIGALRM)
 180 Returns:  nothing
 181 */
 182
 183 void
 184 sigalrm_handler(int sig)
 185 {
 186 sig = sig;      /* Keep picky compilers happy */
 187 sigalrm_seen = TRUE;
 188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
 189 }
 190
 191
 192
 193 /*************************************************
 194 *      Sleep for a fractional time interval      *
 195 *************************************************/
 196
 197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
 198 period of time that may include a fraction of a second. The coding is somewhat
 199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
 200 will wait for ever, so we panic in this instance. (There was a case of this
 201 when a bug in a function that calls milliwait() caused it to pass invalid data.
 202 That's when I added the check. :-)
 203
 204 Argument:  an itimerval structure containing the interval
 205 Returns:   nothing
 206 */
 207
 208 static void
 209 milliwait(struct itimerval *itval)
 210 {
 211 sigset_t sigmask;
 212 sigset_t old_sigmask;
 213 (void)sigemptyset(&sigmask);                           /* Empty mask */
 214 (void)sigaddset(&sigmask, SIGALRM);                    /* Add SIGALRM */
 215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask);  /* Block SIGALRM */
 216 if (setitimer(ITIMER_REAL, itval, NULL) < 0)           /* Start timer */
 217   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
 218     "setitimer() failed: %s", strerror(errno));
 219 (void)sigfillset(&sigmask);                            /* All signals */
 220 (void)sigdelset(&sigmask, SIGALRM);                    /* Remove SIGALRM */
 221 (void)sigsuspend(&sigmask);                            /* Until SIGALRM */
 222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL);    /* Restore mask */
 223 }
 224
 225
 226
 227
 228 /*************************************************
 229 *         Millisecond sleep function             *
 230 *************************************************/
 231
 232 /* The basic sleep() function has a granularity of 1 second, which is too rough
 233 in some cases - for example, when using an increasing delay to slow down
 234 spammers.
 235
 236 Argument:    number of millseconds
 237 Returns:     nothing
 238 */
 239
 240 void
 241 millisleep(int msec)
 242 {
 243 struct itimerval itval;
 244 itval.it_interval.tv_sec = 0;
 245 itval.it_interval.tv_usec = 0;
 246 itval.it_value.tv_sec = msec/1000;
 247 itval.it_value.tv_usec = (msec % 1000) * 1000;
 248 milliwait(&itval);
 249 }
 250
 251
 252
 253 /*************************************************
 254 *         Compare microsecond times              *
 255 *************************************************/
 256
 257 /*
 258 Arguments:
 259   tv1         the first time
 260   tv2         the second time
 261
 262 Returns:      -1, 0, or +1
 263 */
 264
 265 int
 266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
 267 {
 268 if (t1->tv_sec > t2->tv_sec) return +1;
 269 if (t1->tv_sec < t2->tv_sec) return -1;
 270 if (t1->tv_usec > t2->tv_usec) return +1;
 271 if (t1->tv_usec < t2->tv_usec) return -1;
 272 return 0;
 273 }
 274
 275
 276
 277
 278 /*************************************************
 279 *          Clock tick wait function              *
 280 *************************************************/
 281
 282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
 283 message IDs, and in file names for maildir deliveries. Because some OS now
 284 re-use pids within the same second, sub-second times are now being used.
 285 However, for absolute certaintly, we must ensure the clock has ticked before
 286 allowing the relevant process to complete. At the time of implementation of
 287 this code (February 2003), the speed of processors is such that the clock will
 288 invariably have ticked already by the time a process has done its job. This
 289 function prepares for the time when things are faster - and it also copes with
 290 clocks that go backwards.
 291
 292 Arguments:
 293   then_tv      A timeval which was used to create uniqueness; its usec field
 294                  has been rounded down to the value of the resolution.
 295                  We want to be sure the current time is greater than this.
 296   resolution   The resolution that was used to divide the microseconds
 297                  (1 for maildir, larger for message ids)
 298
 299 Returns:       nothing
 300 */
 301
 302 void
 303 exim_wait_tick(struct timeval *then_tv, int resolution)
 304 {
 305 struct timeval now_tv;
 306 long int now_true_usec;
 307
 308 (void)gettimeofday(&now_tv, NULL);
 309 now_true_usec = now_tv.tv_usec;
 310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
 311
 312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
 313   {
 314   struct itimerval itval;
 315   itval.it_interval.tv_sec = 0;
 316   itval.it_interval.tv_usec = 0;
 317   itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
 318   itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
 319
 320   /* We know that, overall, "now" is less than or equal to "then". Therefore, a
 321   negative value for the microseconds is possible only in the case when "now"
 322   is more than a second less than "then". That means that itval.it_value.tv_sec
 323   is greater than zero. The following correction is therefore safe. */
 324
 325   if (itval.it_value.tv_usec < 0)
 326     {
 327     itval.it_value.tv_usec += 1000000;
 328     itval.it_value.tv_sec -= 1;
 329     }
 330
 331   DEBUG(D_transport|D_receive)
 332     {
 333     if (!running_in_test_harness)
 334       {
 335       debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
 336         then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
 337       debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
 338         itval.it_value.tv_usec);
 339       }
 340     }
 341
 342   milliwait(&itval);
 343   }
 344 }
 345
 346
 347
 348
 349 /*************************************************
 350 *            Set up processing details           *
 351 *************************************************/
 352
 353 /* Save a text string for dumping when SIGUSR1 is received.
 354 Do checks for overruns.
 355
 356 Arguments: format and arguments, as for printf()
 357 Returns:   nothing
 358 */
 359
 360 void
 361 set_process_info(char *format, ...)
 362 {
 363 int len;
 364 va_list ap;
 365 sprintf(CS process_info, "%5d ", (int)getpid());
 366 len = Ustrlen(process_info);
 367 va_start(ap, format);
 368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
 369   Ustrcpy(process_info + len, "**** string overflowed buffer ****");
 370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
 371 va_end(ap);
 372 }
 373
 374
 375
 376
 377
 378 /*************************************************
 379 *   Ensure stdin, stdout, and stderr exist       *
 380 *************************************************/
 381
 382 /* Some operating systems grumble if an exec() happens without a standard
 383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 384 file will be opened and will use these fd values, and then some other bit of
 385 code will assume, for example, that it can write error messages to stderr.
 386 This function ensures that fds 0, 1, and 2 are open if they do not already
 387 exist, by connecting them to /dev/null.
 388
 389 This function is also used to ensure that std{in,out,err} exist at all times,
 390 so that if any library that Exim calls tries to use them, it doesn't crash.
 391
 392 Arguments:  None
 393 Returns:    Nothing
 394 */
 395
 396 void
 397 exim_nullstd(void)
 398 {
 399 int i;
 400 int devnull = -1;
 401 struct stat statbuf;
 402 for (i = 0; i <= 2; i++)
 403   {
 404   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 405     {
 406     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 407     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 408       string_open_failed(errno, "/dev/null"));
 409     if (devnull != i) (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_address_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 #ifdef SUPPORT_CRYPTEQ
 837   fprintf(f, " crypteq");
 838 #endif
 839 #if HAVE_ICONV
 840   fprintf(f, " iconv()");
 841 #endif
 842 #if HAVE_IPV6
 843   fprintf(f, " IPv6");
 844 #endif
 845 #ifdef SUPPORT_PAM
 846   fprintf(f, " PAM");
 847 #endif
 848 #ifdef EXIM_PERL
 849   fprintf(f, " Perl");
 850 #endif
 851 #ifdef EXPAND_DLFUNC
 852   fprintf(f, " Expand_dlfunc");
 853 #endif
 854 #ifdef USE_TCP_WRAPPERS
 855   fprintf(f, " TCPwrappers");
 856 #endif
 857 #ifdef SUPPORT_TLS
 858   #ifdef USE_GNUTLS
 859   fprintf(f, " GnuTLS");
 860   #else
 861   fprintf(f, " OpenSSL");
 862   #endif
 863 #endif
 864 #ifdef WITH_CONTENT_SCAN
 865   fprintf(f, " Content_Scanning");
 866 #endif
 867 #ifdef WITH_OLD_DEMIME
 868   fprintf(f, " Old_Demime");
 869 #endif
 870 #ifdef EXPERIMENTAL_SPF
 871   fprintf(f, " Experimental_SPF");
 872 #endif
 873 #ifdef EXPERIMENTAL_SRS
 874   fprintf(f, " Experimental_SRS");
 875 #endif
 876 #ifdef EXPERIMENTAL_BRIGHTMAIL
 877   fprintf(f, " Experimental_Brightmail");
 878 #endif
 879 #ifdef EXPERIMENTAL_DOMAINKEYS
 880   fprintf(f, " Experimental_DomainKeys");
 881 #endif
 882 fprintf(f, "\n");
 883
 884 fprintf(f, "Lookups:");
 885 #ifdef LOOKUP_LSEARCH
 886   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 887 #endif
 888 #ifdef LOOKUP_CDB
 889   fprintf(f, " cdb");
 890 #endif
 891 #ifdef LOOKUP_DBM
 892   fprintf(f, " dbm dbmnz");
 893 #endif
 894 #ifdef LOOKUP_DNSDB
 895   fprintf(f, " dnsdb");
 896 #endif
 897 #ifdef LOOKUP_DSEARCH
 898   fprintf(f, " dsearch");
 899 #endif
 900 #ifdef LOOKUP_IBASE
 901   fprintf(f, " ibase");
 902 #endif
 903 #ifdef LOOKUP_LDAP
 904   fprintf(f, " ldap ldapdn ldapm");
 905 #endif
 906 #ifdef LOOKUP_MYSQL
 907   fprintf(f, " mysql");
 908 #endif
 909 #ifdef LOOKUP_NIS
 910   fprintf(f, " nis nis0");
 911 #endif
 912 #ifdef LOOKUP_NISPLUS
 913   fprintf(f, " nisplus");
 914 #endif
 915 #ifdef LOOKUP_ORACLE
 916   fprintf(f, " oracle");
 917 #endif
 918 #ifdef LOOKUP_PASSWD
 919   fprintf(f, " passwd");
 920 #endif
 921 #ifdef LOOKUP_PGSQL
 922   fprintf(f, " pgsql");
 923 #endif
 924 #ifdef LOOKUP_SQLITE
 925   fprintf(f, " sqlite");
 926 #endif
 927 #ifdef LOOKUP_TESTDB
 928   fprintf(f, " testdb");
 929 #endif
 930 #ifdef LOOKUP_WHOSON
 931   fprintf(f, " whoson");
 932 #endif
 933 fprintf(f, "\n");
 934
 935 fprintf(f, "Authenticators:");
 936 #ifdef AUTH_CRAM_MD5
 937   fprintf(f, " cram_md5");
 938 #endif
 939 #ifdef AUTH_CYRUS_SASL
 940   fprintf(f, " cyrus_sasl");
 941 #endif
 942 #ifdef AUTH_PLAINTEXT
 943   fprintf(f, " plaintext");
 944 #endif
 945 #ifdef AUTH_SPA
 946   fprintf(f, " spa");
 947 #endif
 948 fprintf(f, "\n");
 949
 950 fprintf(f, "Routers:");
 951 #ifdef ROUTER_ACCEPT
 952   fprintf(f, " accept");
 953 #endif
 954 #ifdef ROUTER_DNSLOOKUP
 955   fprintf(f, " dnslookup");
 956 #endif
 957 #ifdef ROUTER_IPLITERAL
 958   fprintf(f, " ipliteral");
 959 #endif
 960 #ifdef ROUTER_IPLOOKUP
 961   fprintf(f, " iplookup");
 962 #endif
 963 #ifdef ROUTER_MANUALROUTE
 964   fprintf(f, " manualroute");
 965 #endif
 966 #ifdef ROUTER_QUERYPROGRAM
 967   fprintf(f, " queryprogram");
 968 #endif
 969 #ifdef ROUTER_REDIRECT
 970   fprintf(f, " redirect");
 971 #endif
 972 fprintf(f, "\n");
 973
 974 fprintf(f, "Transports:");
 975 #ifdef TRANSPORT_APPENDFILE
 976   fprintf(f, " appendfile");
 977   #ifdef SUPPORT_MAILDIR
 978     fprintf(f, "/maildir");
 979   #endif
 980   #ifdef SUPPORT_MAILSTORE
 981     fprintf(f, "/mailstore");
 982   #endif
 983   #ifdef SUPPORT_MBX
 984     fprintf(f, "/mbx");
 985   #endif
 986 #endif
 987 #ifdef TRANSPORT_AUTOREPLY
 988   fprintf(f, " autoreply");
 989 #endif
 990 #ifdef TRANSPORT_LMTP
 991   fprintf(f, " lmtp");
 992 #endif
 993 #ifdef TRANSPORT_PIPE
 994   fprintf(f, " pipe");
 995 #endif
 996 #ifdef TRANSPORT_SMTP
 997   fprintf(f, " smtp");
 998 #endif
 999 fprintf(f, "\n");
1000
1001 if (fixed_never_users[0] > 0)
1002   {
1003   int i;
1004   fprintf(f, "Fixed never_users: ");
1005   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1006     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1007   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1008   }
1009 }
1010
1011
1012
1013
1014 /*************************************************
1015 *               Quote a local part               *
1016 *************************************************/
1017
1018 /* This function is used when a sender address or a From: or Sender: header
1019 line is being created from the caller's login, or from an authenticated_id. It
1020 applies appropriate quoting rules for a local part.
1021
1022 Argument:    the local part
1023 Returns:     the local part, quoted if necessary
1024 */
1025
1026 uschar *
1027 local_part_quote(uschar *lpart)
1028 {
1029 BOOL needs_quote = FALSE;
1030 int size, ptr;
1031 uschar *yield;
1032 uschar *t;
1033
1034 for (t = lpart; !needs_quote && *t != 0; t++)
1035   {
1036   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1037     (*t != '.' || t == lpart || t[1] == 0);
1038   }
1039
1040 if (!needs_quote) return lpart;
1041
1042 size = ptr = 0;
1043 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1044
1045 for (;;)
1046   {
1047   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1048   if (nq == NULL)
1049     {
1050     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1051     break;
1052     }
1053   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1054   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1055   yield = string_cat(yield, &size, &ptr, nq, 1);
1056   lpart = nq + 1;
1057   }
1058
1059 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1060 yield[ptr] = 0;
1061 return yield;
1062 }
1063
1064
1065
1066 #ifdef USE_READLINE
1067 /*************************************************
1068 *         Load readline() functions              *
1069 *************************************************/
1070
1071 /* This function is called from testing executions that read data from stdin,
1072 but only when running as the calling user. Currently, only -be does this. The
1073 function loads the readline() function library and passes back the functions.
1074 On some systems, it needs the curses library, so load that too, but try without
1075 it if loading fails. All this functionality has to be requested at build time.
1076
1077 Arguments:
1078   fn_readline_ptr   pointer to where to put the readline pointer
1079   fn_addhist_ptr    pointer to where to put the addhistory function
1080
1081 Returns:            the dlopen handle or NULL on failure
1082 */
1083
1084 static void *
1085 set_readline(char * (**fn_readline_ptr)(char *),
1086              char * (**fn_addhist_ptr)(char *))
1087 {
1088 void *dlhandle;
1089 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1090
1091 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1092 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1093
1094 if (dlhandle != NULL)
1095   {
1096   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1097   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1098   }
1099 else
1100   {
1101   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1102   }
1103
1104 return dlhandle;
1105 }
1106 #endif
1107
1108
1109
1110 /*************************************************
1111 *    Get a line from stdin for testing things    *
1112 *************************************************/
1113
1114 /* This function is called when running tests that can take a number of lines
1115 of input (for example, -be and -bt). It handles continuations and trailing
1116 spaces. And prompting and a blank line output on eof. If readline() is in use,
1117 the arguments are non-NULL and provide the relevant functions.
1118
1119 Arguments:
1120   fn_readline   readline function or NULL
1121   fn_addhist    addhist function or NULL
1122
1123 Returns:        pointer to dynamic memory, or NULL at end of file
1124 */
1125
1126 static uschar *
1127 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1128 {
1129 int i;
1130 int size = 0;
1131 int ptr = 0;
1132 uschar *yield = NULL;
1133
1134 if (fn_readline == NULL) printf("> ");
1135
1136 for (i = 0;; i++)
1137   {
1138   uschar buffer[1024];
1139   uschar *p, *ss;
1140
1141   #ifdef USE_READLINE
1142   char *readline_line = NULL;
1143   if (fn_readline != NULL)
1144     {
1145     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1146     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1147     p = US readline_line;
1148     }
1149   else
1150   #endif
1151
1152   /* readline() not in use */
1153
1154     {
1155     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1156     p = buffer;
1157     }
1158
1159   /* Handle the line */
1160
1161   ss = p + (int)Ustrlen(p);
1162   while (ss > p && isspace(ss[-1])) ss--;
1163
1164   if (i > 0)
1165     {
1166     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1167     }
1168
1169   yield = string_cat(yield, &size, &ptr, p, ss - p);
1170
1171   #ifdef USE_READLINE
1172   if (fn_readline != NULL) free(readline_line);
1173   #endif
1174
1175   if (ss == p || yield[ptr-1] != '\\')
1176     {
1177     yield[ptr] = 0;
1178     break;
1179     }
1180   yield[--ptr] = 0;
1181   }
1182
1183 if (yield == NULL) printf("\n");
1184 return yield;
1185 }
1186
1187
1188
1189 /*************************************************
1190 *          Entry point and high-level code       *
1191 *************************************************/
1192
1193 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1194 the appropriate action. All the necessary functions are present in the one
1195 binary. I originally thought one should split it up, but it turns out that so
1196 much of the apparatus is needed in each chunk that one might as well just have
1197 it all available all the time, which then makes the coding easier as well.
1198
1199 Arguments:
1200   argc      count of entries in argv
1201   argv      argument strings, with argv[0] being the program name
1202
1203 Returns:    EXIT_SUCCESS if terminated successfully
1204             EXIT_FAILURE otherwise, except when a message has been sent
1205               to the sender, and -oee was given
1206 */
1207
1208 int
1209 main(int argc, char **cargv)
1210 {
1211 uschar **argv = USS cargv;
1212 int  arg_receive_timeout = -1;
1213 int  arg_smtp_receive_timeout = -1;
1214 int  arg_error_handling = error_handling;
1215 int  filter_sfd = -1;
1216 int  filter_ufd = -1;
1217 int  group_count;
1218 int  i;
1219 int  list_queue_option = 0;
1220 int  msg_action = 0;
1221 int  msg_action_arg = -1;
1222 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1223 int  queue_only_reason = 0;
1224 #ifdef EXIM_PERL
1225 int  perl_start_option = 0;
1226 #endif
1227 int  recipients_arg = argc;
1228 int  sender_address_domain = 0;
1229 int  test_retry_arg = -1;
1230 int  test_rewrite_arg = -1;
1231 BOOL arg_queue_only = FALSE;
1232 BOOL bi_option = FALSE;
1233 BOOL checking = FALSE;
1234 BOOL count_queue = FALSE;
1235 BOOL expansion_test = FALSE;
1236 BOOL extract_recipients = FALSE;
1237 BOOL forced_delivery = FALSE;
1238 BOOL f_end_dot = FALSE;
1239 BOOL deliver_give_up = FALSE;
1240 BOOL list_queue = FALSE;
1241 BOOL list_options = FALSE;
1242 BOOL local_queue_only;
1243 BOOL more = TRUE;
1244 BOOL one_msg_action = FALSE;
1245 BOOL queue_only_set = FALSE;
1246 BOOL receiving_message = TRUE;
1247 BOOL unprivileged;
1248 BOOL removed_privilege = FALSE;
1249 BOOL verify_address_mode = FALSE;
1250 BOOL verify_as_sender = FALSE;
1251 BOOL version_printed = FALSE;
1252 uschar *alias_arg = NULL;
1253 uschar *called_as = US"";
1254 uschar *start_queue_run_id = NULL;
1255 uschar *stop_queue_run_id = NULL;
1256 uschar *ftest_domain = NULL;
1257 uschar *ftest_localpart = NULL;
1258 uschar *ftest_prefix = NULL;
1259 uschar *ftest_suffix = NULL;
1260 uschar *real_sender_address;
1261 uschar *originator_home = US"/";
1262 void *reset_point;
1263
1264 struct passwd *pw;
1265 struct stat statbuf;
1266 pid_t passed_qr_pid = (pid_t)0;
1267 int passed_qr_pipe = -1;
1268 gid_t group_list[NGROUPS_MAX];
1269
1270 /* Possible options for -R and -S */
1271
1272 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1273
1274 /* Need to define this in case we need to change the environment in order
1275 to get rid of a bogus time zone. We have to make it char rather than uschar
1276 because some OS define it in /usr/include/unistd.h. */
1277
1278 extern char **environ;
1279
1280 /* If the Exim user and/or group and/or the configuration file owner/group were
1281 defined by ref:name at build time, we must now find the actual uid/gid values.
1282 This is a feature to make the lives of binary distributors easier. */
1283
1284 #ifdef EXIM_USERNAME
1285 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1286   {
1287   exim_gid = pw->pw_gid;
1288   }
1289 else
1290   {
1291   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1292     EXIM_USERNAME);
1293   exit(EXIT_FAILURE);
1294   }
1295 #endif
1296
1297 #ifdef EXIM_GROUPNAME
1298 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1299   {
1300   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1301     EXIM_GROUPNAME);
1302   exit(EXIT_FAILURE);
1303   }
1304 #endif
1305
1306 #ifdef CONFIGURE_OWNERNAME
1307 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1308   {
1309   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1310     CONFIGURE_OWNERNAME);
1311   exit(EXIT_FAILURE);
1312   }
1313 #endif
1314
1315 #ifdef CONFIGURE_GROUPNAME
1316 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1317   {
1318   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1319     CONFIGURE_GROUPNAME);
1320   exit(EXIT_FAILURE);
1321   }
1322 #endif
1323
1324 /* In the Cygwin environment, some initialization needs doing. It is fudged
1325 in by means of this macro. */
1326
1327 #ifdef OS_INIT
1328 OS_INIT
1329 #endif
1330
1331 /* Check a field which is patched when we are running Exim within its
1332 testing harness; do a fast initial check, and then the whole thing. */
1333
1334 running_in_test_harness =
1335   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1336
1337 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1338 at the start of a program; however, it seems that some environments do not
1339 follow this. A "strange" locale can affect the formatting of timestamps, so we
1340 make quite sure. */
1341
1342 setlocale(LC_ALL, "C");
1343
1344 /* Set up the default handler for timing using alarm(). */
1345
1346 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1347
1348 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1349 because store_malloc writes a log entry on failure. */
1350
1351 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1352 if (log_buffer == NULL)
1353   {
1354   fprintf(stderr, "exim: failed to get store for log buffer\n");
1355   exit(EXIT_FAILURE);
1356   }
1357
1358 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1359 NULL when the daemon is run and the file is closed. We have to use this
1360 indirection, because some systems don't allow writing to the variable "stderr".
1361 */
1362
1363 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1364
1365 /* Arrange for the PCRE regex library to use our store functions. Note that
1366 the normal calls are actually macros that add additional arguments for
1367 debugging purposes so we have to assign specially constructed functions here.
1368 The default is to use store in the stacking pool, but this is overridden in the
1369 regex_must_compile() function. */
1370
1371 pcre_malloc = function_store_get;
1372 pcre_free = function_dummy_free;
1373
1374 /* Ensure there is a big buffer for temporary use in several places. It is put
1375 in malloc store so that it can be freed for enlargement if necessary. */
1376
1377 big_buffer = store_malloc(big_buffer_size);
1378
1379 /* Set up the handler for the data request signal, and set the initial
1380 descriptive text. */
1381
1382 set_process_info("initializing");
1383 os_restarting_signal(SIGUSR1, usr1_handler);
1384
1385 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1386 in the daemon code. For the rest of Exim's uses, we ignore it. */
1387
1388 signal(SIGHUP, SIG_IGN);
1389
1390 /* We don't want to die on pipe errors as the code is written to handle
1391 the write error instead. */
1392
1393 signal(SIGPIPE, SIG_IGN);
1394
1395 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1396 set to SIG_IGN. This causes subprocesses that complete before the parent
1397 process waits for them not to hang around, so when Exim calls wait(), nothing
1398 is there. The wait() code has been made robust against this, but let's ensure
1399 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1400 ending status. We use sigaction rather than plain signal() on those OS where
1401 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1402 problem on AIX with this.) */
1403
1404 #ifdef SA_NOCLDWAIT
1405   {
1406   struct sigaction act;
1407   act.sa_handler = SIG_DFL;
1408   sigemptyset(&(act.sa_mask));
1409   act.sa_flags = 0;
1410   sigaction(SIGCHLD, &act, NULL);
1411   }
1412 #else
1413 signal(SIGCHLD, SIG_DFL);
1414 #endif
1415
1416 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1417 SIGHUP. */
1418
1419 sighup_argv = argv;
1420
1421 /* Set up the version number. Set up the leading 'E' for the external form of
1422 message ids, set the pointer to the internal form, and initialize it to
1423 indicate no message being processed. */
1424
1425 version_init();
1426 message_id_option[0] = '-';
1427 message_id_external = message_id_option + 1;
1428 message_id_external[0] = 'E';
1429 message_id = message_id_external + 1;
1430 message_id[0] = 0;
1431
1432 /* Set the umask to zero so that any files that Exim creates are created
1433 with the modes that it specifies. */
1434
1435 umask(0);
1436
1437 /* Precompile the regular expression for matching a message id. Keep this in
1438 step with the code that generates ids in the accept.c module. We need to do
1439 this here, because the -M options check their arguments for syntactic validity
1440 using mac_ismsgid, which uses this. */
1441
1442 regex_ismsgid =
1443   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1444
1445 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1446 this seems to be a generally accepted convention, since one finds symbolic
1447 links called "mailq" in standard OS configurations. */
1448
1449 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1450     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1451   {
1452   list_queue = TRUE;
1453   receiving_message = FALSE;
1454   called_as = US"-mailq";
1455   }
1456
1457 /* If the program is called as "rmail" treat it as equivalent to
1458 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1459 i.e. preventing a single dot on a line from terminating the message, and
1460 returning with zero return code, even in cases of error (provided an error
1461 message has been sent). */
1462
1463 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1464     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1465   {
1466   dot_ends = FALSE;
1467   called_as = US"-rmail";
1468   errors_sender_rc = EXIT_SUCCESS;
1469   }
1470
1471 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1472 this is a smail convention. */
1473
1474 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1475     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1476   {
1477   smtp_input = smtp_batched_input = TRUE;
1478   called_as = US"-rsmtp";
1479   }
1480
1481 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1482 this is a smail convention. */
1483
1484 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1485     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1486   {
1487   queue_interval = 0;
1488   receiving_message = FALSE;
1489   called_as = US"-runq";
1490   }
1491
1492 /* If the program is called as "newaliases" treat it as equivalent to
1493 "exim -bi"; this is a sendmail convention. */
1494
1495 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1496     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1497   {
1498   bi_option = TRUE;
1499   receiving_message = FALSE;
1500   called_as = US"-newaliases";
1501   }
1502
1503 /* Save the original effective uid for a couple of uses later. It should
1504 normally be root, but in some esoteric environments it may not be. */
1505
1506 original_euid = geteuid();
1507
1508 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1509 to be the same as the real ones. This makes a difference only if Exim is setuid
1510 (or setgid) to something other than root, which could be the case in some
1511 special configurations. */
1512
1513 real_uid = getuid();
1514 real_gid = getgid();
1515
1516 if (real_uid == root_uid)
1517   {
1518   setgid(real_gid);
1519   setuid(real_uid);
1520   }
1521
1522 /* If neither the original real uid nor the original euid was root, Exim is
1523 running in an unprivileged state. */
1524
1525 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1526
1527 /* If the first argument is --help, pretend there are no arguments. This will
1528 cause a brief message to be given. */
1529
1530 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1531
1532 /* Scan the program's arguments. Some can be dealt with right away; others are
1533 simply recorded for checking and handling afterwards. Do a high-level switch
1534 on the second character (the one after '-'), to save some effort. */
1535
1536 for (i = 1; i < argc; i++)
1537   {
1538   BOOL badarg = FALSE;
1539   uschar *arg = argv[i];
1540   uschar *argrest;
1541   int switchchar;
1542
1543   /* An argument not starting with '-' is the start of a recipients list;
1544   break out of the options-scanning loop. */
1545
1546   if (arg[0] != '-')
1547     {
1548     recipients_arg = i;
1549     break;
1550     }
1551
1552   /* An option consistion of -- terminates the options */
1553
1554   if (Ustrcmp(arg, "--") == 0)
1555     {
1556     recipients_arg = i + 1;
1557     break;
1558     }
1559
1560   /* Handle flagged options */
1561
1562   switchchar = arg[1];
1563   argrest = arg+2;
1564
1565   /* Make all -ex options synonymous with -oex arguments, since that
1566   is assumed by various callers. Also make -qR options synonymous with -R
1567   options, as that seems to be required as well. Allow for -qqR too, and
1568   the same for -S options. */
1569
1570   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1571       Ustrncmp(arg+1, "qR", 2) == 0 ||
1572       Ustrncmp(arg+1, "qS", 2) == 0)
1573     {
1574     switchchar = arg[2];
1575     argrest++;
1576     }
1577   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1578     {
1579     switchchar = arg[3];
1580     argrest += 2;
1581     queue_2stage = TRUE;
1582     }
1583
1584   /* Make -r synonymous with -f, since it is a documented alias */
1585
1586   else if (arg[1] == 'r') switchchar = 'f';
1587
1588   /* Make -ov synonymous with -v */
1589
1590   else if (Ustrcmp(arg, "-ov") == 0)
1591     {
1592     switchchar = 'v';
1593     argrest++;
1594     }
1595
1596   /* High-level switch on active initial letter */
1597
1598   switch(switchchar)
1599     {
1600     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1601     so has no need of it. */
1602
1603     case 'B':
1604     if (*argrest == 0) i++;       /* Skip over the type */
1605     break;
1606
1607
1608     case 'b':
1609     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1610
1611     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1612        -bdf: Ditto, but in the foreground.
1613     */
1614
1615     if (*argrest == 'd')
1616       {
1617       daemon_listen = TRUE;
1618       if (*(++argrest) == 'f') background_daemon = FALSE;
1619         else if (*argrest != 0) { badarg = TRUE; break; }
1620       }
1621
1622     /* -be: Run in expansion test mode */
1623
1624     else if (*argrest == 'e')
1625       expansion_test = checking = TRUE;
1626
1627     /* -bF:  Run system filter test */
1628
1629     else if (*argrest == 'F')
1630       {
1631       filter_test |= FTEST_SYSTEM;
1632       if (*(++argrest) != 0) { badarg = TRUE; break; }
1633       if (++i < argc) filter_test_sfile = argv[i]; else
1634         {
1635         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1636         exit(EXIT_FAILURE);
1637         }
1638       }
1639
1640     /* -bf:  Run user filter test
1641        -bfd: Set domain for filter testing
1642        -bfl: Set local part for filter testing
1643        -bfp: Set prefix for filter testing
1644        -bfs: Set suffix for filter testing
1645     */
1646
1647     else if (*argrest == 'f')
1648       {
1649       if (*(++argrest) == 0)
1650         {
1651         filter_test |= FTEST_USER;
1652         if (++i < argc) filter_test_ufile = argv[i]; else
1653           {
1654           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1655           exit(EXIT_FAILURE);
1656           }
1657         }
1658       else
1659         {
1660         if (++i >= argc)
1661           {
1662           fprintf(stderr, "exim: string expected after %s\n", arg);
1663           exit(EXIT_FAILURE);
1664           }
1665         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1666         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1667         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1668         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1669         else { badarg = TRUE; break; }
1670         }
1671       }
1672
1673     /* -bh: Host checking - an IP address must follow. */
1674
1675     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1676       {
1677       if (++i >= argc) { badarg = TRUE; break; }
1678       sender_host_address = argv[i];
1679       host_checking = checking = log_testing_mode = TRUE;
1680       host_checking_callout = argrest[1] == 'c';
1681       }
1682
1683     /* -bi: This option is used by sendmail to initialize *the* alias file,
1684     though it has the -oA option to specify a different file. Exim has no
1685     concept of *the* alias file, but since Sun's YP make script calls
1686     sendmail this way, some support must be provided. */
1687
1688     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1689
1690     /* -bm: Accept and deliver message - the default option. Reinstate
1691     receiving_message, which got turned off for all -b options. */
1692
1693     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1694
1695     /* -bnq: For locally originating messages, do not qualify unqualified
1696     addresses. In the envelope, this causes errors; in header lines they
1697     just get left. */
1698
1699     else if (Ustrcmp(argrest, "nq") == 0)
1700       {
1701       allow_unqualified_sender = FALSE;
1702       allow_unqualified_recipient = FALSE;
1703       }
1704
1705     /* -bpxx: List the contents of the mail queue, in various forms. If
1706     the option is -bpc, just a queue count is needed. Otherwise, if the
1707     first letter after p is r, then order is random. */
1708
1709     else if (*argrest == 'p')
1710       {
1711       if (*(++argrest) == 'c')
1712         {
1713         count_queue = TRUE;
1714         if (*(++argrest) != 0) badarg = TRUE;
1715         break;
1716         }
1717
1718       if (*argrest == 'r')
1719         {
1720         list_queue_option = 8;
1721         argrest++;
1722         }
1723       else list_queue_option = 0;
1724
1725       list_queue = TRUE;
1726
1727       /* -bp: List the contents of the mail queue, top-level only */
1728
1729       if (*argrest == 0) {}
1730
1731       /* -bpu: List the contents of the mail queue, top-level undelivered */
1732
1733       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1734
1735       /* -bpa: List the contents of the mail queue, including all delivered */
1736
1737       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1738
1739       /* Unknown after -bp[r] */
1740
1741       else
1742         {
1743         badarg = TRUE;
1744         break;
1745         }
1746       }
1747
1748
1749     /* -bP: List the configuration variables given as the address list.
1750     Force -v, so configuration errors get displayed. */
1751
1752     else if (Ustrcmp(argrest, "P") == 0)
1753       {
1754       list_options = TRUE;
1755       debug_selector |= D_v;
1756       debug_file = stderr;
1757       }
1758
1759     /* -brt: Test retry configuration lookup */
1760
1761     else if (Ustrcmp(argrest, "rt") == 0)
1762       {
1763       test_retry_arg = i + 1;
1764       goto END_ARG;
1765       }
1766
1767     /* -brw: Test rewrite configuration */
1768
1769     else if (Ustrcmp(argrest, "rw") == 0)
1770       {
1771       test_rewrite_arg = i + 1;
1772       goto END_ARG;
1773       }
1774
1775     /* -bS: Read SMTP commands on standard input, but produce no replies -
1776     all errors are reported by sending messages. */
1777
1778     else if (Ustrcmp(argrest, "S") == 0)
1779       smtp_input = smtp_batched_input = receiving_message = TRUE;
1780
1781     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1782     on standard output. */
1783
1784     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1785
1786     /* -bt: address testing mode */
1787
1788     else if (Ustrcmp(argrest, "t") == 0)
1789       address_test_mode = checking = log_testing_mode = TRUE;
1790
1791     /* -bv: verify addresses */
1792
1793     else if (Ustrcmp(argrest, "v") == 0)
1794       verify_address_mode = checking = log_testing_mode = TRUE;
1795
1796     /* -bvs: verify sender addresses */
1797
1798     else if (Ustrcmp(argrest, "vs") == 0)
1799       {
1800       verify_address_mode = checking = log_testing_mode = TRUE;
1801       verify_as_sender = TRUE;
1802       }
1803
1804     /* -bV: Print version string and support details */
1805
1806     else if (Ustrcmp(argrest, "V") == 0)
1807       {
1808       printf("Exim version %s #%s built %s\n", version_string,
1809         version_cnumber, version_date);
1810       printf("%s\n", CS version_copyright);
1811       version_printed = TRUE;
1812       show_whats_supported(stdout);
1813       }
1814
1815     else badarg = TRUE;
1816     break;
1817
1818
1819     /* -C: change configuration file list; ignore if it isn't really
1820     a change! Enforce a prefix check if required. */
1821
1822     case 'C':
1823     if (*argrest == 0)
1824       {
1825       if(++i < argc) argrest = argv[i]; else
1826         { badarg = TRUE; break; }
1827       }
1828     if (Ustrcmp(config_main_filelist, argrest) != 0)
1829       {
1830       #ifdef ALT_CONFIG_PREFIX
1831       int sep = 0;
1832       int len = Ustrlen(ALT_CONFIG_PREFIX);
1833       uschar *list = argrest;
1834       uschar *filename;
1835       while((filename = string_nextinlist(&list, &sep, big_buffer,
1836              big_buffer_size)) != NULL)
1837         {
1838         if ((Ustrlen(filename) < len ||
1839              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1840              Ustrstr(filename, "/../") != NULL) &&
1841              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1842           {
1843           fprintf(stderr, "-C Permission denied\n");
1844           exit(EXIT_FAILURE);
1845           }
1846         }
1847       #endif
1848
1849       config_main_filelist = argrest;
1850       config_changed = TRUE;
1851       }
1852     break;
1853
1854
1855     /* -D: set up a macro definition */
1856
1857     case 'D':
1858     #ifdef DISABLE_D_OPTION
1859     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1860     exit(EXIT_FAILURE);
1861     #else
1862       {
1863       int ptr = 0;
1864       macro_item *mlast = NULL;
1865       macro_item *m;
1866       uschar name[24];
1867       uschar *s = argrest;
1868
1869       while (isspace(*s)) s++;
1870
1871       if (*s < 'A' || *s > 'Z')
1872         {
1873         fprintf(stderr, "exim: macro name set by -D must start with "
1874           "an upper case letter\n");
1875         exit(EXIT_FAILURE);
1876         }
1877
1878       while (isalnum(*s) || *s == '_')
1879         {
1880         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1881         s++;
1882         }
1883       name[ptr] = 0;
1884       if (ptr == 0) { badarg = TRUE; break; }
1885       while (isspace(*s)) s++;
1886       if (*s != 0)
1887         {
1888         if (*s++ != '=') { badarg = TRUE; break; }
1889         while (isspace(*s)) s++;
1890         }
1891
1892       for (m = macros; m != NULL; m = m->next)
1893         {
1894         if (Ustrcmp(m->name, name) == 0)
1895           {
1896           fprintf(stderr, "exim: duplicated -D in command line\n");
1897           exit(EXIT_FAILURE);
1898           }
1899         mlast = m;
1900         }
1901
1902       m = store_get(sizeof(macro_item) + Ustrlen(name));
1903       m->next = NULL;
1904       m->command_line = TRUE;
1905       if (mlast == NULL) macros = m; else mlast->next = m;
1906       Ustrcpy(m->name, name);
1907       m->replacement = string_copy(s);
1908
1909       if (clmacro_count >= MAX_CLMACROS)
1910         {
1911         fprintf(stderr, "exim: too many -D options on command line\n");
1912         exit(EXIT_FAILURE);
1913         }
1914       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1915         m->replacement);
1916       }
1917     #endif
1918     break;
1919
1920     /* -d: Set debug level (see also -v below) or set the drop_cr option.
1921     The latter is now a no-op, retained for compatibility only. If -dd is used,
1922     debugging subprocesses of the daemon is disabled. */
1923
1924     case 'd':
1925     if (Ustrcmp(argrest, "ropcr") == 0)
1926       {
1927       /* drop_cr = TRUE; */
1928       }
1929
1930     /* Use an intermediate variable so that we don't set debugging while
1931     decoding the debugging bits. */
1932
1933     else
1934       {
1935       unsigned int selector = D_default;
1936       debug_selector = 0;
1937       debug_file = NULL;
1938       if (*argrest == 'd')
1939         {
1940         debug_daemon = TRUE;
1941         argrest++;
1942         }
1943       if (*argrest != 0)
1944         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1945           debug_options_count, US"debug");
1946       debug_selector = selector;
1947       }
1948     break;
1949
1950
1951     /* -E: This is a local error message. This option is not intended for
1952     external use at all, but is not restricted to trusted callers because it
1953     does no harm (just suppresses certain error messages) and if Exim is run
1954     not setuid root it won't always be trusted when it generates error
1955     messages using this option. If there is a message id following -E, point
1956     message_reference at it, for logging. */
1957
1958     case 'E':
1959     local_error_message = TRUE;
1960     if (mac_ismsgid(argrest)) message_reference = argrest;
1961     break;
1962
1963
1964     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1965     option, so it looks as if historically the -oex options are also callable
1966     without the leading -o. So we have to accept them. Before the switch,
1967     anything starting -oe has been converted to -e. Exim does not support all
1968     of the sendmail error options. */
1969
1970     case 'e':
1971     if (Ustrcmp(argrest, "e") == 0)
1972       {
1973       arg_error_handling = ERRORS_SENDER;
1974       errors_sender_rc = EXIT_SUCCESS;
1975       }
1976     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1977     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1978     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1979     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1980     else badarg = TRUE;
1981     break;
1982
1983
1984     /* -F: Set sender's full name, used instead of the gecos entry from
1985     the password file. Since users can usually alter their gecos entries,
1986     there's no security involved in using this instead. The data can follow
1987     the -F or be in the next argument. */
1988
1989     case 'F':
1990     if (*argrest == 0)
1991       {
1992       if(++i < argc) argrest = argv[i]; else
1993         { badarg = TRUE; break; }
1994       }
1995     originator_name = argrest;
1996     sender_name_forced = TRUE;
1997     break;
1998
1999
2000     /* -f: Set sender's address - this value is only actually used if Exim is
2001     run by a trusted user, or if untrusted_set_sender is set and matches the
2002     address, except that the null address can always be set by any user. The
2003     test for this happens later, when the value given here is ignored when not
2004     permitted. For an untrusted user, the actual sender is still put in Sender:
2005     if it doesn't match the From: header (unless no_local_from_check is set).
2006     The data can follow the -f or be in the next argument. The -r switch is an
2007     obsolete form of -f but since there appear to be programs out there that
2008     use anything that sendmail has ever supported, better accept it - the
2009     synonymizing is done before the switch above.
2010
2011     At this stage, we must allow domain literal addresses, because we don't
2012     know what the setting of allow_domain_literals is yet. Ditto for trailing
2013     dots and strip_trailing_dot. */
2014
2015     case 'f':
2016       {
2017       int start, end;
2018       uschar *errmess;
2019       if (*argrest == 0)
2020         {
2021         if (i+1 < argc) argrest = argv[++i]; else
2022           { badarg = TRUE; break; }
2023         }
2024       if (*argrest == 0)
2025         {
2026         sender_address = string_sprintf("");  /* Ensure writeable memory */
2027         }
2028       else
2029         {
2030         uschar *temp = argrest + Ustrlen(argrest) - 1;
2031         while (temp >= argrest && isspace(*temp)) temp--;
2032         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2033         allow_domain_literals = TRUE;
2034         strip_trailing_dot = TRUE;
2035         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2036           &sender_address_domain, TRUE);
2037         allow_domain_literals = FALSE;
2038         strip_trailing_dot = FALSE;
2039         if (sender_address == NULL)
2040           {
2041           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2042           return EXIT_FAILURE;
2043           }
2044         }
2045       sender_address_forced = TRUE;
2046       }
2047     break;
2048
2049     /* This is some Sendmail thing which can be ignored */
2050
2051     case 'G':
2052     break;
2053
2054     /* -h: Set the hop count for an incoming message. Exim does not currently
2055     support this; it always computes it by counting the Received: headers.
2056     To put it in will require a change to the spool header file format. */
2057
2058     case 'h':
2059     if (*argrest == 0)
2060       {
2061       if(++i < argc) argrest = argv[i]; else
2062         { badarg = TRUE; break; }
2063       }
2064     if (!isdigit(*argrest)) badarg = TRUE;
2065     break;
2066
2067
2068     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2069     not to be documented for sendmail but mailx (at least) uses it) */
2070
2071     case 'i':
2072     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2073     break;
2074
2075
2076     case 'M':
2077     receiving_message = FALSE;
2078
2079     /* -MC:  continue delivery of another message via an existing open
2080     file descriptor. This option is used for an internal call by the
2081     smtp transport when there is a pending message waiting to go to an
2082     address to which it has got a connection. Five subsequent arguments are
2083     required: transport name, host name, IP address, sequence number, and
2084     message_id. Transports may decline to create new processes if the sequence
2085     number gets too big. The channel is stdin. This (-MC) must be the last
2086     argument. There's a subsequent check that the real-uid is privileged.
2087
2088     If we are running in the test harness. delay for a bit, to let the process
2089     that set this one up complete. This makes for repeatability of the logging,
2090     etc. output. */
2091
2092     if (Ustrcmp(argrest, "C") == 0)
2093       {
2094       if (argc != i + 6)
2095         {
2096         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2097         return EXIT_FAILURE;
2098         }
2099
2100       if (msg_action_arg >= 0)
2101         {
2102         fprintf(stderr, "exim: incompatible arguments\n");
2103         return EXIT_FAILURE;
2104         }
2105
2106       continue_transport = argv[++i];
2107       continue_hostname = argv[++i];
2108       continue_host_address = argv[++i];
2109       continue_sequence = Uatoi(argv[++i]);
2110       msg_action = MSG_DELIVER;
2111       msg_action_arg = ++i;
2112       forced_delivery = TRUE;
2113       queue_run_pid = passed_qr_pid;
2114       queue_run_pipe = passed_qr_pipe;
2115
2116       if (!mac_ismsgid(argv[i]))
2117         {
2118         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2119           argv[i]);
2120         return EXIT_FAILURE;
2121         }
2122
2123       if (running_in_test_harness) millisleep(500);
2124       break;
2125       }
2126
2127     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2128     precedes -MC (see above). The flag indicates that the host to which
2129     Exim is connected has accepted an AUTH sequence. */
2130
2131     else if (Ustrcmp(argrest, "CA") == 0)
2132       {
2133       smtp_authenticated = TRUE;
2134       break;
2135       }
2136
2137     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2138     it preceded -MC (see above) */
2139
2140     else if (Ustrcmp(argrest, "CP") == 0)
2141       {
2142       smtp_use_pipelining = TRUE;
2143       break;
2144       }
2145
2146     /* -MCQ: pass on the pid of the queue-running process that started
2147     this chain of deliveries and the fd of its synchronizing pipe; this
2148     is useful only when it precedes -MC (see above) */
2149
2150     else if (Ustrcmp(argrest, "CQ") == 0)
2151       {
2152       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2153         else badarg = TRUE;
2154       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2155         else badarg = TRUE;
2156       break;
2157       }
2158
2159     /* -MCS: set the smtp_use_size flag; this is useful only when it
2160     precedes -MC (see above) */
2161
2162     else if (Ustrcmp(argrest, "CS") == 0)
2163       {
2164       smtp_use_size = TRUE;
2165       break;
2166       }
2167
2168     /* -MCT: set the tls_offered flag; this is useful only when it
2169     precedes -MC (see above). The flag indicates that the host to which
2170     Exim is connected has offered TLS support. */
2171
2172     #ifdef SUPPORT_TLS
2173     else if (Ustrcmp(argrest, "CT") == 0)
2174       {
2175       tls_offered = TRUE;
2176       break;
2177       }
2178     #endif
2179
2180     /* -M[x]: various operations on the following list of message ids:
2181        -M    deliver the messages, ignoring next retry times and thawing
2182        -Mc   deliver the messages, checking next retry times, no thawing
2183        -Mf   freeze the messages
2184        -Mg   give up on the messages
2185        -Mt   thaw the messages
2186        -Mrm  remove the messages
2187     In the above cases, this must be the last option. There are also the
2188     following options which are followed by a single message id, and which
2189     act on that message. Some of them use the "recipient" addresses as well.
2190        -Mar  add recipient(s)
2191        -Mmad mark all recipients delivered
2192        -Mmd  mark recipients(s) delivered
2193        -Mes  edit sender
2194        -Mvb  show body
2195        -Mvh  show header
2196        -Mvl  show log
2197     */
2198
2199     else if (*argrest == 0)
2200       {
2201       msg_action = MSG_DELIVER;
2202       forced_delivery = deliver_force_thaw = TRUE;
2203       }
2204     else if (Ustrcmp(argrest, "ar") == 0)
2205       {
2206       msg_action = MSG_ADD_RECIPIENT;
2207       one_msg_action = TRUE;
2208       }
2209     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2210     else if (Ustrcmp(argrest, "es") == 0)
2211       {
2212       msg_action = MSG_EDIT_SENDER;
2213       one_msg_action = TRUE;
2214       }
2215     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2216     else if (Ustrcmp(argrest, "g") == 0)
2217       {
2218       msg_action = MSG_DELIVER;
2219       deliver_give_up = TRUE;
2220       }
2221     else if (Ustrcmp(argrest, "mad") == 0)
2222       {
2223       msg_action = MSG_MARK_ALL_DELIVERED;
2224       }
2225     else if (Ustrcmp(argrest, "md") == 0)
2226       {
2227       msg_action = MSG_MARK_DELIVERED;
2228       one_msg_action = TRUE;
2229       }
2230     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2231     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2232     else if (Ustrcmp(argrest, "vb") == 0)
2233       {
2234       msg_action = MSG_SHOW_BODY;
2235       one_msg_action = TRUE;
2236       }
2237     else if (Ustrcmp(argrest, "vh") == 0)
2238       {
2239       msg_action = MSG_SHOW_HEADER;
2240       one_msg_action = TRUE;
2241       }
2242     else if (Ustrcmp(argrest, "vl") == 0)
2243       {
2244       msg_action = MSG_SHOW_LOG;
2245       one_msg_action = TRUE;
2246       }
2247     else { badarg = TRUE; break; }
2248
2249     /* All the -Mxx options require at least one message id. */
2250
2251     msg_action_arg = i + 1;
2252     if (msg_action_arg >= argc)
2253       {
2254       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2255       return EXIT_FAILURE;
2256       }
2257
2258     /* Some require only message ids to follow */
2259
2260     if (!one_msg_action)
2261       {
2262       int j;
2263       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2264         {
2265         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2266           argv[j], arg);
2267         return EXIT_FAILURE;
2268         }
2269       goto END_ARG;   /* Remaining args are ids */
2270       }
2271
2272     /* Others require only one message id, possibly followed by addresses,
2273     which will be handled as normal arguments. */
2274
2275     else
2276       {
2277       if (!mac_ismsgid(argv[msg_action_arg]))
2278         {
2279         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2280           argv[msg_action_arg], arg);
2281         return EXIT_FAILURE;
2282         }
2283       i++;
2284       }
2285     break;
2286
2287
2288     /* Some programs seem to call the -om option without the leading o;
2289     for sendmail it askes for "me too". Exim always does this. */
2290
2291     case 'm':
2292     if (*argrest != 0) badarg = TRUE;
2293     break;
2294
2295
2296     /* -N: don't do delivery - a debugging option that stops transports doing
2297     their thing. It implies debugging at the D_v level. */
2298
2299     case 'N':
2300     if (*argrest == 0)
2301       {
2302       dont_deliver = TRUE;
2303       debug_selector |= D_v;
2304       debug_file = stderr;
2305       }
2306     else badarg = TRUE;
2307     break;
2308
2309
2310     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2311     it. */
2312
2313     case 'n':
2314     break;
2315
2316     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2317     option to the specified value. This form uses long names. We need to handle
2318     -O option=value and -Ooption=value. */
2319
2320     case 'O':
2321     if (*argrest == 0)
2322       {
2323       if (++i >= argc)
2324         {
2325         fprintf(stderr, "exim: string expected after -O\n");
2326         exit(EXIT_FAILURE);
2327         }
2328       }
2329     break;
2330
2331     case 'o':
2332
2333     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2334     file" option). */
2335
2336     if (*argrest == 'A')
2337       {
2338       alias_arg = argrest + 1;
2339       if (alias_arg[0] == 0)
2340         {
2341         if (i+1 < argc) alias_arg = argv[++i]; else
2342           {
2343           fprintf(stderr, "exim: string expected after -oA\n");
2344           exit(EXIT_FAILURE);
2345           }
2346         }
2347       }
2348
2349     /* -oB: Set a connection message max value for remote deliveries */
2350
2351     else if (*argrest == 'B')
2352       {
2353       uschar *p = argrest + 1;
2354       if (p[0] == 0)
2355         {
2356         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2357           {
2358           connection_max_messages = 1;
2359           p = NULL;
2360           }
2361         }
2362
2363       if (p != NULL)
2364         {
2365         if (!isdigit(*p))
2366           {
2367           fprintf(stderr, "exim: number expected after -oB\n");
2368           exit(EXIT_FAILURE);
2369           }
2370         connection_max_messages = Uatoi(p);
2371         }
2372       }
2373
2374     /* -odb: background delivery */
2375
2376     else if (Ustrcmp(argrest, "db") == 0)
2377       {
2378       synchronous_delivery = FALSE;
2379       arg_queue_only = FALSE;
2380       queue_only_set = TRUE;
2381       }
2382
2383     /* -odf: foreground delivery (smail-compatible option); same effect as
2384        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2385     */
2386
2387     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2388       {
2389       synchronous_delivery = TRUE;
2390       arg_queue_only = FALSE;
2391       queue_only_set = TRUE;
2392       }
2393
2394     /* -odq: queue only */
2395
2396     else if (Ustrcmp(argrest, "dq") == 0)
2397       {
2398       synchronous_delivery = FALSE;
2399       arg_queue_only = TRUE;
2400       queue_only_set = TRUE;
2401       }
2402
2403     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2404     but no remote delivery */
2405
2406     else if (Ustrcmp(argrest, "dqs") == 0)
2407       {
2408       queue_smtp = TRUE;
2409       arg_queue_only = FALSE;
2410       queue_only_set = TRUE;
2411       }
2412
2413     /* -oex: Sendmail error flags. As these are also accepted without the
2414     leading -o prefix, for compatibility with vacation and other callers,
2415     they are handled with -e above. */
2416
2417     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2418        -oitrue: Another sendmail syntax for the same */
2419
2420     else if (Ustrcmp(argrest, "i") == 0 ||
2421              Ustrcmp(argrest, "itrue") == 0)
2422       dot_ends = FALSE;
2423
2424     /* -oM*: Set various characteristics for an incoming message; actually
2425     acted on for trusted callers only. */
2426
2427     else if (*argrest == 'M')
2428       {
2429       if (i+1 >= argc)
2430         {
2431         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2432         exit(EXIT_FAILURE);
2433         }
2434
2435       /* -oMa: Set sender host address */
2436
2437       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2438
2439       /* -oMaa: Set authenticator name */
2440
2441       else if (Ustrcmp(argrest, "Maa") == 0)
2442         sender_host_authenticated = argv[++i];
2443
2444       /* -oMas: setting authenticated sender */
2445
2446       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2447
2448       /* -oMai: setting authenticated id */
2449
2450       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2451
2452       /* -oMi: Set incoming interface address */
2453
2454       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2455
2456       /* -oMr: Received protocol */
2457
2458       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2459
2460       /* -oMs: Set sender host name */
2461
2462       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2463
2464       /* -oMt: Set sender ident */
2465
2466       else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2467
2468       /* Else a bad argument */
2469
2470       else
2471         {
2472         badarg = TRUE;
2473         break;
2474         }
2475       }
2476
2477     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2478     seem to call this as -m (undocumented), so that is also accepted (see
2479     above). */
2480
2481     else if (Ustrcmp(argrest, "m") == 0) {}
2482
2483     /* -oo: An ancient flag for old-style addresses which still seems to
2484     crop up in some calls (see in SCO). */
2485
2486     else if (Ustrcmp(argrest, "o") == 0) {}
2487
2488     /* -oP <name>: set pid file path for daemon */
2489
2490     else if (Ustrcmp(argrest, "P") == 0)
2491       override_pid_file_path = argv[++i];
2492
2493     /* -or <n>: set timeout for non-SMTP acceptance
2494        -os <n>: set timeout for SMTP acceptance */
2495
2496     else if (*argrest == 'r' || *argrest == 's')
2497       {
2498       int *tp = (*argrest == 'r')?
2499         &arg_receive_timeout : &arg_smtp_receive_timeout;
2500       if (argrest[1] == 0)
2501         {
2502         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2503         }
2504       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2505       if (*tp < 0)
2506         {
2507         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2508         exit(EXIT_FAILURE);
2509         }
2510       }
2511
2512     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2513
2514     else if (Ustrcmp(argrest, "X") == 0)
2515       override_local_interfaces = argv[++i];
2516
2517     /* Unknown -o argument */
2518
2519     else badarg = TRUE;
2520     break;
2521
2522
2523     /* -ps: force Perl startup; -pd force delayed Perl startup */
2524
2525     case 'p':
2526     #ifdef EXIM_PERL
2527     if (*argrest == 's' && argrest[1] == 0)
2528       {
2529       perl_start_option = 1;
2530       break;
2531       }
2532     if (*argrest == 'd' && argrest[1] == 0)
2533       {
2534       perl_start_option = -1;
2535       break;
2536       }
2537     #endif
2538
2539     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2540     which sets the host protocol and host name */
2541
2542     if (*argrest == 0)
2543       {
2544       if (i+1 < argc) argrest = argv[++i]; else
2545         { badarg = TRUE; break; }
2546       }
2547
2548     if (*argrest != 0)
2549       {
2550       uschar *hn = Ustrchr(argrest, ':');
2551       if (hn == NULL)
2552         {
2553         received_protocol = argrest;
2554         }
2555       else
2556         {
2557         received_protocol = string_copyn(argrest, hn - argrest);
2558         sender_host_name = hn + 1;
2559         }
2560       }
2561     break;
2562
2563
2564     case 'q':
2565     receiving_message = FALSE;
2566
2567     /* -qq...: Do queue runs in a 2-stage manner */
2568
2569     if (*argrest == 'q')
2570       {
2571       queue_2stage = TRUE;
2572       argrest++;
2573       }
2574
2575     /* -qi...: Do only first (initial) deliveries */
2576
2577     if (*argrest == 'i')
2578       {
2579       queue_run_first_delivery = TRUE;
2580       argrest++;
2581       }
2582
2583     /* -qf...: Run the queue, forcing deliveries
2584        -qff..: Ditto, forcing thawing as well */
2585
2586     if (*argrest == 'f')
2587       {
2588       queue_run_force = TRUE;
2589       if (*(++argrest) == 'f')
2590         {
2591         deliver_force_thaw = TRUE;
2592         argrest++;
2593         }
2594       }
2595
2596     /* -q[f][f]l...: Run the queue only on local deliveries */
2597
2598     if (*argrest == 'l')
2599       {
2600       queue_run_local = TRUE;
2601       argrest++;
2602       }
2603
2604     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2605     optionally starting from a given message id. */
2606
2607     if (*argrest == 0 &&
2608         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2609       {
2610       queue_interval = 0;
2611       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2612         start_queue_run_id = argv[++i];
2613       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2614         stop_queue_run_id = argv[++i];
2615       }
2616
2617     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2618     optionally local only. */
2619
2620     else
2621       {
2622       if (*argrest != 0)
2623         queue_interval = readconf_readtime(argrest, 0, FALSE);
2624       else
2625         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2626       if (queue_interval <= 0)
2627         {
2628         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2629         exit(EXIT_FAILURE);
2630         }
2631       }
2632     break;
2633
2634
2635     case 'R':   /* Synonymous with -qR... */
2636     receiving_message = FALSE;
2637
2638     /* -Rf:   As -R (below) but force all deliveries,
2639        -Rff:  Ditto, but also thaw all frozen messages,
2640        -Rr:   String is regex
2641        -Rrf:  Regex and force
2642        -Rrff: Regex and force and thaw
2643
2644     in all cases provided there are no further characters in this
2645     argument. */
2646
2647     if (*argrest != 0)
2648       {
2649       int i;
2650       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2651         {
2652         if (Ustrcmp(argrest, rsopts[i]) == 0)
2653           {
2654           if (i != 2) queue_run_force = TRUE;
2655           if (i >= 2) deliver_selectstring_regex = TRUE;
2656           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2657           argrest += Ustrlen(rsopts[i]);
2658           }
2659         }
2660       }
2661
2662     /* -R: Set string to match in addresses for forced queue run to
2663     pick out particular messages. */
2664
2665     if (*argrest == 0)
2666       {
2667       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2668         {
2669         fprintf(stderr, "exim: string expected after -R\n");
2670         exit(EXIT_FAILURE);
2671         }
2672       }
2673     else deliver_selectstring = argrest;
2674     if (queue_interval < 0) queue_interval = 0;
2675     break;
2676
2677
2678     /* -r: an obsolete synonym for -f (see above) */
2679
2680
2681     /* -S: Like -R but works on sender. */
2682
2683     case 'S':   /* Synonymous with -qS... */
2684     receiving_message = FALSE;
2685
2686     /* -Sf:   As -S (below) but force all deliveries,
2687        -Sff:  Ditto, but also thaw all frozen messages,
2688        -Sr:   String is regex
2689        -Srf:  Regex and force
2690        -Srff: Regex and force and thaw
2691
2692     in all cases provided there are no further characters in this
2693     argument. */
2694
2695     if (*argrest != 0)
2696       {
2697       int i;
2698       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2699         {
2700         if (Ustrcmp(argrest, rsopts[i]) == 0)
2701           {
2702           if (i != 2) queue_run_force = TRUE;
2703           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2704           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2705           argrest += Ustrlen(rsopts[i]);
2706           }
2707         }
2708       }
2709
2710     /* -S: Set string to match in addresses for forced queue run to
2711     pick out particular messages. */
2712
2713     if (*argrest == 0)
2714       {
2715       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2716         {
2717         fprintf(stderr, "exim: string expected after -S\n");
2718         exit(EXIT_FAILURE);
2719         }
2720       }
2721     else deliver_selectstring_sender = argrest;
2722     if (queue_interval < 0) queue_interval = 0;
2723     break;
2724
2725     /* -Tqt is an option that is exclusively for use by the testing suite.
2726     It is not recognized in other circumstances. It allows for the setting up
2727     of explicit "queue times" so that various warning/retry things can be
2728     tested. Otherwise variability of clock ticks etc. cause problems. */
2729
2730     case 'T':
2731     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2732       fudged_queue_times = argv[++i];
2733     else badarg = TRUE;
2734     break;
2735
2736
2737     /* -t: Set flag to extract recipients from body of message. */
2738
2739     case 't':
2740     if (*argrest == 0) extract_recipients = TRUE;
2741
2742     /* -ti: Set flag to extract recipients from body of message, and also
2743     specify that dot does not end the message. */
2744
2745     else if (Ustrcmp(argrest, "i") == 0)
2746       {
2747       extract_recipients = TRUE;
2748       dot_ends = FALSE;
2749       }
2750
2751     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2752
2753     #ifdef SUPPORT_TLS
2754     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2755     #endif
2756
2757     else badarg = TRUE;
2758     break;
2759
2760
2761     /* -U: This means "initial user submission" in sendmail, apparently. The
2762     doc claims that in future sendmail may refuse syntactically invalid
2763     messages instead of fixing them. For the moment, we just ignore it. */
2764
2765     case 'U':
2766     break;
2767
2768
2769     /* -v: verify things - this is a very low-level debugging */
2770
2771     case 'v':
2772     if (*argrest == 0)
2773       {
2774       debug_selector |= D_v;
2775       debug_file = stderr;
2776       }
2777     else badarg = TRUE;
2778     break;
2779
2780
2781     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2782
2783       The -x flag tells the sendmail command that mail from a local
2784       mail program has National Language Support (NLS) extended characters
2785       in the body of the mail item. The sendmail command can send mail with
2786       extended NLS characters across networks that normally corrupts these
2787       8-bit characters.
2788
2789     As Exim is 8-bit clean, it just ignores this flag. */
2790
2791     case 'x':
2792     if (*argrest != 0) badarg = TRUE;
2793     break;
2794
2795     /* All other initial characters are errors */
2796
2797     default:
2798     badarg = TRUE;
2799     break;
2800     }         /* End of high-level switch statement */
2801
2802   /* Failed to recognize the option, or syntax error */
2803
2804   if (badarg)
2805     {
2806     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2807       "option %s\n", arg);
2808     exit(EXIT_FAILURE);
2809     }
2810   }
2811
2812
2813 /* Arguments have been processed. Check for incompatibilities. */
2814
2815 END_ARG:
2816 if ((
2817     (smtp_input || extract_recipients || recipients_arg < argc) &&
2818     (daemon_listen || queue_interval >= 0 || bi_option ||
2819       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2820       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2821     ) ||
2822     (
2823     msg_action_arg > 0 &&
2824     (daemon_listen || queue_interval >= 0 || list_options || checking ||
2825      bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2826     ) ||
2827     (
2828     (daemon_listen || queue_interval >= 0) &&
2829     (sender_address != NULL || list_options || list_queue || checking ||
2830      bi_option)
2831     ) ||
2832     (
2833     daemon_listen && queue_interval == 0
2834     ) ||
2835     (
2836     list_options &&
2837     (checking || smtp_input || extract_recipients ||
2838       filter_test != FTEST_NONE || bi_option)
2839     ) ||
2840     (
2841     verify_address_mode &&
2842     (address_test_mode || smtp_input || extract_recipients ||
2843       filter_test != FTEST_NONE || bi_option)
2844     ) ||
2845     (
2846     address_test_mode && (smtp_input || extract_recipients ||
2847       filter_test != FTEST_NONE || bi_option)
2848     ) ||
2849     (
2850     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2851       extract_recipients)
2852     ) ||
2853     (
2854     deliver_selectstring != NULL && queue_interval < 0
2855     )
2856    )
2857   {
2858   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2859   exit(EXIT_FAILURE);
2860   }
2861
2862 /* If debugging is set up, set the file and the file descriptor to pass on to
2863 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2864 to run in the foreground. */
2865
2866 if (debug_selector != 0)
2867   {
2868   debug_file = stderr;
2869   debug_fd = fileno(debug_file);
2870   background_daemon = FALSE;
2871   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
2872   if (debug_selector != D_v)    /* -v only doesn't show this */
2873     {
2874     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2875       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2876       debug_selector);
2877     show_whats_supported(stderr);
2878     }
2879   }
2880
2881 /* When started with root privilege, ensure that the limits on the number of
2882 open files and the number of processes (where that is accessible) are
2883 sufficiently large, or are unset, in case Exim has been called from an
2884 environment where the limits are screwed down. Not all OS have the ability to
2885 change some of these limits. */
2886
2887 if (unprivileged)
2888   {
2889   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2890   }
2891 else
2892   {
2893   struct rlimit rlp;
2894
2895   #ifdef RLIMIT_NOFILE
2896   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2897     {
2898     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2899       strerror(errno));
2900     rlp.rlim_cur = rlp.rlim_max = 0;
2901     }
2902
2903   /* I originally chose 1000 as a nice big number that was unlikely to
2904   be exceeded. It turns out that some older OS have a fixed upper limit of
2905   256. */
2906
2907   if (rlp.rlim_cur < 1000)
2908     {
2909     rlp.rlim_cur = rlp.rlim_max = 1000;
2910     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2911       {
2912       rlp.rlim_cur = rlp.rlim_max = 256;
2913       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2914         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2915           strerror(errno));
2916       }
2917     }
2918   #endif
2919
2920   #ifdef RLIMIT_NPROC
2921   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2922     {
2923     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2924       strerror(errno));
2925     rlp.rlim_cur = rlp.rlim_max = 0;
2926     }
2927
2928   #ifdef RLIM_INFINITY
2929   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2930     {
2931     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2932   #else
2933   if (rlp.rlim_cur < 1000)
2934     {
2935     rlp.rlim_cur = rlp.rlim_max = 1000;
2936   #endif
2937     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2938       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2939         strerror(errno));
2940     }
2941   #endif
2942   }
2943
2944 /* Exim is normally entered as root (but some special configurations are
2945 possible that don't do this). However, it always spins off sub-processes that
2946 set their uid and gid as required for local delivery. We don't want to pass on
2947 any extra groups that root may belong to, so we want to get rid of them all at
2948 this point.
2949
2950 We need to obey setgroups() at this stage, before possibly giving up root
2951 privilege for a changed configuration file, but later on we might need to
2952 check on the additional groups for the admin user privilege - can't do that
2953 till after reading the config, which might specify the exim gid. Therefore,
2954 save the group list here first. */
2955
2956 group_count = getgroups(NGROUPS_MAX, group_list);
2957
2958 /* There is a fundamental difference in some BSD systems in the matter of
2959 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2960 known not to be different. On the "different" systems there is a single group
2961 list, and the first entry in it is the current group. On all other versions of
2962 Unix there is a supplementary group list, which is in *addition* to the current
2963 group. Consequently, to get rid of all extraneous groups on a "standard" system
2964 you pass over 0 groups to setgroups(), while on a "different" system you pass
2965 over a single group - the current group, which is always the first group in the
2966 list. Calling setgroups() with zero groups on a "different" system results in
2967 an error return. The following code should cope with both types of system.
2968
2969 However, if this process isn't running as root, setgroups() can't be used
2970 since you have to be root to run it, even if throwing away groups. Not being
2971 root here happens only in some unusual configurations. We just ignore the
2972 error. */
2973
2974 if (setgroups(0, NULL) != 0)
2975   {
2976   if (setgroups(1, group_list) != 0 && !unprivileged)
2977     {
2978     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2979     exit(EXIT_FAILURE);
2980     }
2981   }
2982
2983 /* If the configuration file name has been altered by an argument on the
2984 command line (either a new file name or a macro definition) and the caller is
2985 not root or the exim user, or if this is a filter testing run, remove any
2986 setuid privilege the program has, and run as the underlying user.
2987
2988 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2989 severely restricts the use of -C for some purposes.
2990
2991 Otherwise, set the real ids to the effective values (should be root unless run
2992 from inetd, which it can either be root or the exim uid, if one is configured).
2993
2994 There is a private mechanism for bypassing some of this, in order to make it
2995 possible to test lots of configurations automatically, without having either to
2996 recompile each time, or to patch in an actual configuration file name and other
2997 values (such as the path name). If running in the test harness, pretend that
2998 configuration file changes and macro definitions haven't happened. */
2999
3000 if ((                                            /* EITHER */
3001     (config_changed || macros != NULL) &&        /* Config changed, and */
3002     real_uid != root_uid &&                      /* Not root, and */
3003     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
3004     real_uid != exim_uid &&                      /* Not exim, and */
3005     #endif
3006     !running_in_test_harness                     /* Not fudged */
3007     ) ||                                         /*   OR   */
3008     expansion_test                               /* expansion testing */
3009     ||                                           /*   OR   */
3010     filter_test != FTEST_NONE)                   /* Filter testing */
3011   {
3012   setgroups(group_count, group_list);
3013   exim_setugid(real_uid, real_gid, FALSE,
3014     US"-C, -D, -be or -bf forces real uid");
3015   removed_privilege = TRUE;
3016
3017   /* In the normal case when Exim is called like this, stderr is available
3018   and should be used for any logging information because attempts to write
3019   to the log will usually fail. To arrange this, we unset really_exim. However,
3020   if no stderr is available there is no point - we might as well have a go
3021   at the log (if it fails, syslog will be written). */
3022
3023   if (log_stderr != NULL) really_exim = FALSE;
3024   }
3025
3026 /* Privilege is to be retained for the moment. It may be dropped later,
3027 depending on the job that this Exim process has been asked to do. For now, set
3028 the real uid to the effective so that subsequent re-execs of Exim are done by a
3029 privileged user. */
3030
3031 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3032
3033 /* If testing a filter, open the file(s) now, before wasting time doing other
3034 setups and reading the message. */
3035
3036 if ((filter_test & FTEST_SYSTEM) != 0)
3037   {
3038   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3039   if (filter_sfd < 0)
3040     {
3041     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3042       strerror(errno));
3043     return EXIT_FAILURE;
3044     }
3045   }
3046
3047 if ((filter_test & FTEST_USER) != 0)
3048   {
3049   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3050   if (filter_ufd < 0)
3051     {
3052     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3053       strerror(errno));
3054     return EXIT_FAILURE;
3055     }
3056   }
3057
3058 /* Read the main runtime configuration data; this gives up if there
3059 is a failure. It leaves the configuration file open so that the subsequent
3060 configuration data for delivery can be read if needed. */
3061
3062 readconf_main();
3063
3064 /* Handle the decoding of logging options. */
3065
3066 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3067   log_options, log_options_count, US"log");
3068
3069 DEBUG(D_any)
3070   {
3071   debug_printf("configuration file is %s\n", config_main_filename);
3072   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3073     log_extra_selector);
3074   }
3075
3076 /* If domain literals are not allowed, check the sender address that was
3077 supplied with -f. Ditto for a stripped trailing dot. */
3078
3079 if (sender_address != NULL)
3080   {
3081   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3082     {
3083     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3084       "allowed\n", sender_address);
3085     return EXIT_FAILURE;
3086     }
3087   if (f_end_dot && !strip_trailing_dot)
3088     {
3089     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3090       "(trailing dot not allowed)\n", sender_address);
3091     return EXIT_FAILURE;
3092     }
3093   }
3094
3095 /* Paranoia check of maximum lengths of certain strings. There is a check
3096 on the length of the log file path in log.c, which will come into effect
3097 if there are any calls to write the log earlier than this. However, if we
3098 get this far but the string is very long, it is better to stop now than to
3099 carry on and (e.g.) receive a message and then have to collapse. The call to
3100 log_write() from here will cause the ultimate panic collapse if the complete
3101 file name exceeds the buffer length. */
3102
3103 if (Ustrlen(log_file_path) > 200)
3104   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3105     "log_file_path is longer than 200 chars: aborting");
3106
3107 if (Ustrlen(pid_file_path) > 200)
3108   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3109     "pid_file_path is longer than 200 chars: aborting");
3110
3111 if (Ustrlen(spool_directory) > 200)
3112   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3113     "spool_directory is longer than 200 chars: aborting");
3114
3115 /* Length check on the process name given to syslog for its TAG field,
3116 which is only permitted to be 32 characters or less. See RFC 3164. */
3117
3118 if (Ustrlen(syslog_processname) > 32)
3119   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3120     "syslog_processname is longer than 32 chars: aborting");
3121
3122 /* In some operating systems, the environment variable TMPDIR controls where
3123 temporary files are created; Exim doesn't use these (apart from when delivering
3124 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3125 If TMPDIR is found in the environment, reset it to the value defined in the
3126 TMPDIR macro, if this macro is defined. */
3127
3128 #ifdef TMPDIR
3129   {
3130   uschar **p;
3131   for (p = USS environ; *p != NULL; p++)
3132     {
3133     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3134         Ustrcmp(*p+7, TMPDIR) != 0)
3135       {
3136       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3137       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3138       *p = newp;
3139       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3140       }
3141     }
3142   }
3143 #endif
3144
3145 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3146 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3147 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3148 called by a user who has set the TZ variable. This then affects the timestamps
3149 in log files and in Received: headers, and any created Date: header lines. The
3150 required timezone is settable in the configuration file, so nothing can be done
3151 about this earlier - but hopefully nothing will normally be logged earlier than
3152 this. We have to make a new environment if TZ is wrong, but don't bother if
3153 timestamps_utc is set, because then all times are in UTC anyway. */
3154
3155 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3156   {
3157   timestamps_utc = TRUE;
3158   }
3159 else
3160   {
3161   uschar *envtz = US getenv("TZ");
3162   if ((envtz == NULL && timezone_string != NULL) ||
3163       (envtz != NULL &&
3164         (timezone_string == NULL ||
3165          Ustrcmp(timezone_string, envtz) != 0)))
3166     {
3167     uschar **p = USS environ;
3168     uschar **new;
3169     uschar **newp;
3170     int count = 0;
3171     while (*p++ != NULL) count++;
3172     if (envtz == NULL) count++;
3173     newp = new = malloc(sizeof(uschar *) * (count + 1));
3174     for (p = USS environ; *p != NULL; p++)
3175       {
3176       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3177       *newp++ = *p;
3178       }
3179     if (timezone_string != NULL)
3180       {
3181       *newp = malloc(Ustrlen(timezone_string) + 4);
3182       sprintf(CS *newp++, "TZ=%s", timezone_string);
3183       }
3184     *newp = NULL;
3185     environ = CSS new;
3186     tzset();
3187     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3188       tod_stamp(tod_log));
3189     }
3190   }
3191
3192 /* Handle the case when we have removed the setuid privilege because of -C or
3193 -D. This means that the caller of Exim was not root, and, provided that
3194 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3195 the binary.
3196
3197 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3198 were running as the exim user defined in the configuration file (different to
3199 the one in the binary). The sysadmin may expect this case to retain privilege
3200 because "the binary was called by the Exim user", but it hasn't, because of the
3201 order in which it handles this stuff. There are two possibilities:
3202
3203   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3204       to do message deliveries. Thus, the fact that it is running as a
3205       non-privileged user is plausible, and might be wanted in some special
3206       configurations. However, really_exim will have been set false when
3207       privilege was dropped, to stop Exim trying to write to its normal log
3208       files. Therefore, re-enable normal log processing, assuming the sysadmin
3209       has set up the log directory correctly.
3210
3211   (2) If deliver_drop_privilege is not set, the configuration won't work as
3212       apparently intended, and so we log a panic message. In order to retain
3213       root for -C or -D, the caller must either be root or the Exim user
3214       defined in the binary (when deliver_drop_ privilege is false).
3215
3216 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3217 built-in exim user or one defined in the configuration. In either event,
3218 re-enable log processing, assuming the sysadmin knows what they are doing. */
3219
3220 if (removed_privilege && (config_changed || macros != NULL) &&
3221     real_uid == exim_uid)
3222   {
3223   #ifdef ALT_CONFIG_ROOT_ONLY
3224   really_exim = TRUE;   /* let logging work normally */
3225   #else
3226
3227   if (deliver_drop_privilege)
3228     really_exim = TRUE; /* let logging work normally */
3229   else
3230     log_write(0, LOG_MAIN|LOG_PANIC,
3231       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3232       (int)exim_uid, config_changed? "-C" : "-D");
3233   #endif
3234   }
3235
3236 /* Start up Perl interpreter if Perl support is configured and there is a
3237 perl_startup option, and the configuration or the command line specifies
3238 initializing starting. Note that the global variables are actually called
3239 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3240
3241 #ifdef EXIM_PERL
3242 if (perl_start_option != 0)
3243   opt_perl_at_start = (perl_start_option > 0);
3244 if (opt_perl_at_start && opt_perl_startup != NULL)
3245   {
3246   uschar *errstr;
3247   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3248   errstr = init_perl(opt_perl_startup);
3249   if (errstr != NULL)
3250     {
3251     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3252     return EXIT_FAILURE;
3253     }
3254   opt_perl_started = TRUE;
3255   }
3256 #endif /* EXIM_PERL */
3257
3258 /* Log the arguments of the call if the configuration file said so. This is
3259 a debugging feature for finding out what arguments certain MUAs actually use.
3260 Don't attempt it if logging is disabled, or if listing variables or if
3261 verifying/testing addresses or expansions. */
3262
3263 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3264       && really_exim && !list_options && !checking)
3265   {
3266   int i;
3267   uschar *p = big_buffer;
3268   Ustrcpy(p, "cwd=");
3269   (void)getcwd(CS p+4, big_buffer_size - 4);
3270   while (*p) p++;
3271   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3272   while (*p) p++;
3273   for (i = 0; i < argc; i++)
3274     {
3275     int len = Ustrlen(argv[i]);
3276     uschar *printing;
3277     uschar *quote;
3278     if (p + len + 8 >= big_buffer + big_buffer_size)
3279       {
3280       Ustrcpy(p, " ...");
3281       log_write(0, LOG_MAIN, "%s", big_buffer);
3282       Ustrcpy(big_buffer, "...");
3283       p = big_buffer + 3;
3284       }
3285     printing = string_printing(argv[i]);
3286     if (printing[0] == 0) quote = US"\""; else
3287       {
3288       uschar *pp = printing;
3289       quote = US"";
3290       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3291       }
3292     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3293       (p - big_buffer) - 4), printing, quote);
3294     while (*p) p++;
3295     }
3296
3297   if ((log_extra_selector & LX_arguments) != 0)
3298     log_write(0, LOG_MAIN, "%s", big_buffer);
3299   else
3300     debug_printf("%s\n", big_buffer);
3301   }
3302
3303 /* Set the working directory to be the top-level spool directory. We don't rely
3304 on this in the code, which always uses fully qualified names, but it's useful
3305 for core dumps etc. Don't complain if it fails - the spool directory might not
3306 be generally accessible and calls with the -C option (and others) have lost
3307 privilege by now. Before the chdir, we try to ensure that the directory exists.
3308 */
3309
3310 if (Uchdir(spool_directory) != 0)
3311   {
3312   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3313   (void)Uchdir(spool_directory);
3314   }
3315
3316 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3317 alias file. Exim doesn't have such a concept, but this call is screwed into
3318 Sun's YP makefiles. Handle this by calling a configured script, as the real
3319 user who called Exim. The -oA option can be used to pass an argument to the
3320 script. */
3321
3322 if (bi_option)
3323   {
3324   (void)fclose(config_file);
3325   if (bi_command != NULL)
3326     {
3327     int i = 0;
3328     uschar *argv[3];
3329     argv[i++] = bi_command;
3330     if (alias_arg != NULL) argv[i++] = alias_arg;
3331     argv[i++] = NULL;
3332
3333     setgroups(group_count, group_list);
3334     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3335
3336     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3337       (argv[1] == NULL)? US"" : argv[1]);
3338
3339     execv(CS argv[0], (char *const *)argv);
3340     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3341     exit(EXIT_FAILURE);
3342     }
3343   else
3344     {
3345     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3346     exit(EXIT_SUCCESS);
3347     }
3348   }
3349
3350 /* If an action on specific messages is requested, or if a daemon or queue
3351 runner is being started, we need to know if Exim was called by an admin user.
3352 This is the case if the real user is root or exim, or if the real group is
3353 exim, or if one of the supplementary groups is exim or a group listed in
3354 admin_groups. We don't fail all message actions immediately if not admin_user,
3355 since some actions can be performed by non-admin users. Instead, set admin_user
3356 for later interrogation. */
3357
3358 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3359   admin_user = TRUE;
3360 else
3361   {
3362   int i, j;
3363
3364   for (i = 0; i < group_count; i++)
3365     {
3366     if (group_list[i] == exim_gid) admin_user = TRUE;
3367     else if (admin_groups != NULL)
3368       {
3369       for (j = 1; j <= (int)(admin_groups[0]); j++)
3370         if (admin_groups[j] == group_list[i])
3371           { admin_user = TRUE; break; }
3372       }
3373     if (admin_user) break;
3374     }
3375   }
3376
3377 /* Another group of privileged users are the trusted users. These are root,
3378 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3379 are permitted to specify sender_addresses with -f on the command line, and
3380 other message parameters as well. */
3381
3382 if (real_uid == root_uid || real_uid == exim_uid)
3383   trusted_caller = TRUE;
3384 else
3385   {
3386   int i, j;
3387
3388   if (trusted_users != NULL)
3389     {
3390     for (i = 1; i <= (int)(trusted_users[0]); i++)
3391       if (trusted_users[i] == real_uid)
3392         { trusted_caller = TRUE; break; }
3393     }
3394
3395   if (!trusted_caller && trusted_groups != NULL)
3396     {
3397     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3398       {
3399       if (trusted_groups[i] == real_gid)
3400         trusted_caller = TRUE;
3401       else for (j = 0; j < group_count; j++)
3402         {
3403         if (trusted_groups[i] == group_list[j])
3404           { trusted_caller = TRUE; break; }
3405         }
3406       if (trusted_caller) break;
3407       }
3408     }
3409   }
3410
3411 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3412 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3413
3414 /* Only an admin user may start the daemon or force a queue run in the default
3415 configuration, but the queue run restriction can be relaxed. Only an admin
3416 user may request that a message be returned to its sender forthwith. Only an
3417 admin user may specify a debug level greater than D_v (because it might show
3418 passwords, etc. in lookup queries). Only an admin user may request a queue
3419 count. */
3420
3421 if (!admin_user)
3422   {
3423   BOOL debugset = (debug_selector & ~D_v) != 0;
3424   if (deliver_give_up || daemon_listen ||
3425      (count_queue && queue_list_requires_admin) ||
3426      (list_queue && queue_list_requires_admin) ||
3427      (queue_interval >= 0 && prod_requires_admin) ||
3428      (debugset && !running_in_test_harness))
3429     {
3430     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3431     exit(EXIT_FAILURE);
3432     }
3433   }
3434
3435 /* If the real user is not root or the exim uid, the argument for passing
3436 in an open TCP/IP connection for another message is not permitted, nor is
3437 running with the -N option for any delivery action, unless this call to exim is
3438 one that supplied an input message, or we are using a patched exim for
3439 regression testing. */
3440
3441 if (real_uid != root_uid && real_uid != exim_uid &&
3442      (continue_hostname != NULL ||
3443        (dont_deliver &&
3444          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3445        )) && !running_in_test_harness)
3446   {
3447   fprintf(stderr, "exim: Permission denied\n");
3448   return EXIT_FAILURE;
3449   }
3450
3451 /* If the caller is not trusted, certain arguments are ignored when running for
3452 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3453 Note that authority for performing certain actions on messages is tested in the
3454 queue_action() function. */
3455
3456 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3457   {
3458   sender_host_name = sender_host_address = interface_address =
3459     sender_ident = received_protocol = NULL;
3460   sender_host_port = interface_port = 0;
3461   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3462   }
3463
3464 /* If a sender host address is set, extract the optional port number off the
3465 end of it and check its syntax. Do the same thing for the interface address.
3466 Exim exits if the syntax is bad. */
3467
3468 else
3469   {
3470   if (sender_host_address != NULL)
3471     sender_host_port = check_port(sender_host_address);
3472   if (interface_address != NULL)
3473     interface_port = check_port(interface_address);
3474   }
3475
3476 /* If an SMTP message is being received check to see if the standard input is a
3477 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3478 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3479 barf. */
3480
3481 if (smtp_input)
3482   {
3483   union sockaddr_46 inetd_sock;
3484   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3485   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3486     {
3487     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3488     if (family == AF_INET || family == AF_INET6)
3489       {
3490       union sockaddr_46 interface_sock;
3491       size = sizeof(interface_sock);
3492
3493       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3494         interface_address = host_ntoa(-1, &interface_sock, NULL,
3495           &interface_port);
3496
3497       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3498
3499       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3500         {
3501         is_inetd = TRUE;
3502         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3503           NULL, &sender_host_port);
3504         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3505           "inetd is not supported when mua_wrapper is set");
3506         }
3507       else
3508         {
3509         fprintf(stderr,
3510           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3511         return EXIT_FAILURE;
3512         }
3513       }
3514     }
3515   }
3516
3517 /* If the load average is going to be needed while receiving a message, get it
3518 now for those OS that require the first call to os_getloadavg() to be done as
3519 root. There will be further calls later for each message received. */
3520
3521 #ifdef LOAD_AVG_NEEDS_ROOT
3522 if (receiving_message &&
3523       (queue_only_load >= 0 ||
3524         (is_inetd && smtp_load_reserve >= 0)
3525       ))
3526   {
3527   load_average = os_getloadavg();
3528   }
3529 #endif
3530
3531 /* The queue_only configuration option can be overridden by -odx on the command
3532 line, except that if queue_only_override is false, queue_only cannot be unset
3533 from the command line. */
3534
3535 if (queue_only_set && (queue_only_override || arg_queue_only))
3536   queue_only = arg_queue_only;
3537
3538 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3539 -or and -os. */
3540
3541 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3542 if (arg_smtp_receive_timeout >= 0)
3543   smtp_receive_timeout = arg_smtp_receive_timeout;
3544
3545 /* If Exim was started with root privilege, unless we have already removed the
3546 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3547 except when starting the daemon or doing some kind of delivery or address
3548 testing (-bt). These are the only cases when root need to be retained. We run
3549 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3550 retained only for starting the daemon. */
3551
3552 if (!unprivileged &&                      /* originally had root AND */
3553     !removed_privilege &&                 /* still got root AND      */
3554     !daemon_listen &&                     /* not starting the daemon */
3555     queue_interval <= 0 &&                /* (either kind of daemon) */
3556       (                                   /*    AND EITHER           */
3557       deliver_drop_privilege ||           /* requested unprivileged  */
3558         (                                 /*       OR                */
3559         queue_interval < 0 &&             /* not running the queue   */
3560         (msg_action_arg < 0 ||            /*       and               */
3561           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3562         (!checking || !address_test_mode) /* not address checking    */
3563         )
3564       ))
3565   {
3566   exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3567   }
3568
3569 /* When we are retaining a privileged uid, we still change to the exim gid. */
3570
3571 else setgid(exim_gid);
3572
3573 /* Handle a request to list the delivery queue */
3574
3575 if (list_queue)
3576   {
3577   set_process_info("listing the queue");
3578   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3579   exit(EXIT_SUCCESS);
3580   }
3581
3582 /* Handle a request to count the delivery queue */
3583
3584 if (count_queue)
3585   {
3586   set_process_info("counting the queue");
3587   queue_count();
3588   exit(EXIT_SUCCESS);
3589   }
3590
3591 /* Handle actions on specific messages, except for the force delivery action,
3592 which is done below. Some actions take a whole list of message ids, which
3593 are known to continue up to the end of the arguments. Others take a single
3594 message id and then operate on the recipients list. */
3595
3596 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3597   {
3598   int yield = EXIT_SUCCESS;
3599   set_process_info("acting on specified messages");
3600
3601   if (!one_msg_action)
3602     {
3603     for (i = msg_action_arg; i < argc; i++)
3604       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3605         yield = EXIT_FAILURE;
3606     }
3607
3608   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3609     recipients_arg)) yield = EXIT_FAILURE;
3610   exit(yield);
3611   }
3612
3613 /* All the modes below here require the remaining configuration sections
3614 to be read, except that we can skip over the ACL setting when delivering
3615 specific messages, or doing a queue run. (For various testing cases we could
3616 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3617 for skipping. */
3618
3619 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3620
3621 /* The configuration data will have been read into POOL_PERM because we won't
3622 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3623 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3624 configuration were read into POOL_MAIN, because we don't do any resets till
3625 later on. However, it seems right, and it does ensure that both pools get used.
3626 */
3627
3628 store_pool = POOL_MAIN;
3629
3630 /* Handle the -brt option. This is for checking out retry configurations.
3631 The next three arguments are a domain name or a complete address, and
3632 optionally two error numbers. All it does is to call the function that
3633 scans the retry configuration data. */
3634
3635 if (test_retry_arg >= 0)
3636   {
3637   retry_config *yield;
3638   int basic_errno = 0;
3639   int more_errno = 0;
3640   uschar *s1, *s2;
3641
3642   if (test_retry_arg >= argc)
3643     {
3644     printf("-brt needs a domain or address argument\n");
3645     exim_exit(EXIT_FAILURE);
3646     }
3647   s1 = argv[test_retry_arg++];
3648   s2 = NULL;
3649
3650   /* If the first argument contains no @ and no . it might be a local user
3651   or it might be a single-component name. Treat as a domain. */
3652
3653   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3654     {
3655     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3656       "being \ntreated as a one-component domain, not as a local part.\n\n",
3657       s1);
3658     }
3659
3660   /* There may be an optional second domain arg. */
3661
3662   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3663     s2 = argv[test_retry_arg++];
3664
3665   /* The final arg is an error name */
3666
3667   if (test_retry_arg < argc)
3668     {
3669     uschar *ss = argv[test_retry_arg];
3670     uschar *error =
3671       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3672     if (error != NULL)
3673       {
3674       printf("%s\n", CS error);
3675       return EXIT_FAILURE;
3676       }
3677
3678     /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3679     an error is for matching codes to the decade. Turn them into a real error
3680     code, off the decade. */
3681
3682     if (basic_errno == ERRNO_RCPT4XX)
3683       {
3684       int code = (more_errno >> 8) & 255;
3685       if (code == 255)
3686         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3687       else if (code > 100)
3688         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3689       }
3690     }
3691
3692   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3693   if (yield == NULL) printf("No retry information found\n"); else
3694     {
3695     retry_rule *r;
3696     more_errno = yield->more_errno;
3697     printf("Retry rule: %s  ", yield->pattern);
3698
3699     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3700       {
3701       printf("quota%s%s  ",
3702         (more_errno > 0)? "_" : "",
3703         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3704       }
3705     else if (yield->basic_errno == ECONNREFUSED)
3706       {
3707       printf("refused%s%s  ",
3708         (more_errno > 0)? "_" : "",
3709         (more_errno == 'M')? "MX" :
3710         (more_errno == 'A')? "A" : "");
3711       }
3712     else if (yield->basic_errno == ETIMEDOUT)
3713       {
3714       printf("timeout");
3715       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3716       more_errno &= 255;
3717       if (more_errno != 0) printf("_%s",
3718         (more_errno == 'M')? "MX" : "A");
3719       printf("  ");
3720       }
3721     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3722       printf("auth_failed  ");
3723     else printf("*  ");
3724
3725     for (r = yield->rules; r != NULL; r = r->next)
3726       {
3727       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3728       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3729       if (r->rule == 'G')
3730         {
3731         int x = r->p2;
3732         int f = x % 1000;
3733         int d = 100;
3734         printf(",%d.", x/1000);
3735         do
3736           {
3737           printf("%d", f/d);
3738           f %= d;
3739           d /= 10;
3740           }
3741         while (f != 0);
3742         }
3743       printf("; ");
3744       }
3745
3746     printf("\n");
3747     }
3748   exim_exit(EXIT_SUCCESS);
3749   }
3750
3751 /* Handle a request to list one or more configuration options */
3752
3753 if (list_options)
3754   {
3755   set_process_info("listing variables");
3756   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3757     else for (i = recipients_arg; i < argc; i++)
3758       {
3759       if (i < argc - 1 &&
3760           (Ustrcmp(argv[i], "router") == 0 ||
3761            Ustrcmp(argv[i], "transport") == 0 ||
3762            Ustrcmp(argv[i], "authenticator") == 0))
3763         {
3764         readconf_print(argv[i+1], argv[i]);
3765         i++;
3766         }
3767       else readconf_print(argv[i], NULL);
3768       }
3769   exim_exit(EXIT_SUCCESS);
3770   }
3771
3772
3773 /* Handle a request to deliver one or more messages that are already on the
3774 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3775 is typically used for a small number when prodding by hand (when the option
3776 forced_delivery will be set) or when re-execing to regain root privilege.
3777 Each message delivery must happen in a separate process, so we fork a process
3778 for each one, and run them sequentially so that debugging output doesn't get
3779 intertwined, and to avoid spawning too many processes if a long list is given.
3780 However, don't fork for the last one; this saves a process in the common case
3781 when Exim is called to deliver just one message. */
3782
3783 if (msg_action_arg > 0)
3784   {
3785   if (prod_requires_admin && !admin_user)
3786     {
3787     fprintf(stderr, "exim: Permission denied\n");
3788     exim_exit(EXIT_FAILURE);
3789     }
3790   set_process_info("delivering specified messages");
3791   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3792   for (i = msg_action_arg; i < argc; i++)
3793     {
3794     int status;
3795     pid_t pid;
3796     if (i == argc - 1)
3797       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3798     else if ((pid = fork()) == 0)
3799       {
3800       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3801       _exit(EXIT_SUCCESS);
3802       }
3803     else if (pid < 0)
3804       {
3805       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3806         strerror(errno));
3807       exim_exit(EXIT_FAILURE);
3808       }
3809     else wait(&status);
3810     }
3811   exim_exit(EXIT_SUCCESS);
3812   }
3813
3814
3815 /* If only a single queue run is requested, without SMTP listening, we can just
3816 turn into a queue runner, with an optional starting message id. */
3817
3818 if (queue_interval == 0 && !daemon_listen)
3819   {
3820   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3821     (start_queue_run_id == NULL)? US"" : US" starting at ",
3822     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3823     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
3824     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
3825   set_process_info("running the queue (single queue run)");
3826   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3827   exim_exit(EXIT_SUCCESS);
3828   }
3829
3830
3831 /* Find the login name of the real user running this process. This is always
3832 needed when receiving a message, because it is written into the spool file. It
3833 may also be used to construct a from: or a sender: header, and in this case we
3834 need the user's full name as well, so save a copy of it, checked for RFC822
3835 syntax and munged if necessary, if it hasn't previously been set by the -F
3836 argument. We may try to get the passwd entry more than once, in case NIS or
3837 other delays are in evidence. Save the home directory for use in filter testing
3838 (only). */
3839
3840 for (i = 0;;)
3841   {
3842   if ((pw = getpwuid(real_uid)) != NULL)
3843     {
3844     originator_login = string_copy(US pw->pw_name);
3845     originator_home = string_copy(US pw->pw_dir);
3846
3847     /* If user name has not been set by -F, set it from the passwd entry
3848     unless -f has been used to set the sender address by a trusted user. */
3849
3850     if (originator_name == NULL)
3851       {
3852       if (sender_address == NULL ||
3853            (!trusted_caller && filter_test == FTEST_NONE))
3854         {
3855         uschar *name = US pw->pw_gecos;
3856         uschar *amp = Ustrchr(name, '&');
3857         uschar buffer[256];
3858
3859         /* Most Unix specify that a '&' character in the gecos field is
3860         replaced by a copy of the login name, and some even specify that
3861         the first character should be upper cased, so that's what we do. */
3862
3863         if (amp != NULL)
3864           {
3865           int loffset;
3866           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3867             amp - name, name, &loffset, originator_login, amp + 1);
3868           buffer[loffset] = toupper(buffer[loffset]);
3869           name = buffer;
3870           }
3871
3872         /* If a pattern for matching the gecos field was supplied, apply
3873         it and then expand the name string. */
3874
3875         if (gecos_pattern != NULL && gecos_name != NULL)
3876           {
3877           const pcre *re;
3878           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3879
3880           if (regex_match_and_setup(re, name, 0, -1))
3881             {
3882             uschar *new_name = expand_string(gecos_name);
3883             expand_nmax = -1;
3884             if (new_name != NULL)
3885               {
3886               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3887                 "gecos field \"%s\"\n", new_name, name);
3888               name = new_name;
3889               }
3890             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3891               "\"%s\": %s\n", gecos_name, expand_string_message);
3892             }
3893           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3894             "gecos field \"%s\"\n", gecos_pattern, name);
3895           store_free((void *)re);
3896           }
3897         originator_name = string_copy(name);
3898         }
3899
3900       /* A trusted caller has used -f but not -F */
3901
3902       else originator_name = US"";
3903       }
3904
3905     /* Break the retry loop */
3906
3907     break;
3908     }
3909
3910   if (++i > finduser_retries) break;
3911   sleep(1);
3912   }
3913
3914 /* If we cannot get a user login, log the incident and give up, unless the
3915 configuration specifies something to use. When running in the test harness,
3916 any setting of unknown_login overrides the actual name. */
3917
3918 if (originator_login == NULL || running_in_test_harness)
3919   {
3920   if (unknown_login != NULL)
3921     {
3922     originator_login = expand_string(unknown_login);
3923     if (originator_name == NULL && unknown_username != NULL)
3924       originator_name = expand_string(unknown_username);
3925     if (originator_name == NULL) originator_name = US"";
3926     }
3927   if (originator_login == NULL)
3928     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3929       (int)real_uid);
3930   }
3931
3932 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3933 RFC822 address.*/
3934
3935 originator_name = string_copy(parse_fix_phrase(originator_name,
3936   Ustrlen(originator_name), big_buffer, big_buffer_size));
3937
3938 /* If a message is created by this call of Exim, the uid/gid of its originator
3939 are those of the caller. These values are overridden if an existing message is
3940 read in from the spool. */
3941
3942 originator_uid = real_uid;
3943 originator_gid = real_gid;
3944
3945 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3946   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3947
3948 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3949 returns. We leave this till here so that the originator_ fields are available
3950 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3951 mode. */
3952
3953 if (daemon_listen || queue_interval > 0)
3954   {
3955   if (mua_wrapper)
3956     {
3957     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3958     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3959       "mua_wrapper is set");
3960     }
3961   daemon_go();
3962   }
3963
3964 /* If the sender ident has not been set (by a trusted caller) set it to
3965 the caller. This will get overwritten below for an inetd call. If a trusted
3966 caller has set it empty, unset it. */
3967
3968 if (sender_ident == NULL) sender_ident = originator_login;
3969   else if (sender_ident[0] == 0) sender_ident = NULL;
3970
3971 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3972 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3973 originator_* variables set. */
3974
3975 if (test_rewrite_arg >= 0)
3976   {
3977   really_exim = FALSE;
3978   if (test_rewrite_arg >= argc)
3979     {
3980     printf("-brw needs an address argument\n");
3981     exim_exit(EXIT_FAILURE);
3982     }
3983   rewrite_test(argv[test_rewrite_arg]);
3984   exim_exit(EXIT_SUCCESS);
3985   }
3986
3987 /* A locally-supplied message is considered to be coming from a local user
3988 unless a trusted caller supplies a sender address with -f, or is passing in the
3989 message via SMTP (inetd invocation or otherwise). */
3990
3991 if ((sender_address == NULL && !smtp_input) ||
3992     (!trusted_caller && filter_test == FTEST_NONE))
3993   {
3994   sender_local = TRUE;
3995
3996   /* A trusted caller can supply authenticated_sender and authenticated_id
3997   via -oMas and -oMai and if so, they will already be set. */
3998
3999   if (authenticated_sender == NULL)
4000     authenticated_sender = string_sprintf("%s@%s", originator_login,
4001       qualify_domain_sender);
4002   if (authenticated_id == NULL) authenticated_id = originator_login;
4003   }
4004
4005 /* Trusted callers are always permitted to specify the sender address.
4006 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4007 is specified is the empty address. However, if a trusted caller does not
4008 specify a sender address for SMTP input, we leave sender_address unset. This
4009 causes the MAIL commands to be honoured. */
4010
4011 if ((!smtp_input && sender_address == NULL) ||
4012     !receive_check_set_sender(sender_address))
4013   {
4014   /* Either the caller is not permitted to set a general sender, or this is
4015   non-SMTP input and the trusted caller has not set a sender. If there is no
4016   sender, or if a sender other than <> is set, override with the originator's
4017   login (which will get qualified below), except when checking things. */
4018
4019   if (sender_address == NULL             /* No sender_address set */
4020        ||                                /*         OR            */
4021        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4022        !checking &&                      /* Not running tests, AND */
4023        filter_test == FTEST_NONE))       /* Not testing a filter */
4024     {
4025     sender_address = originator_login;
4026     sender_address_forced = FALSE;
4027     sender_address_domain = 0;
4028     }
4029   }
4030
4031 /* Remember whether an untrusted caller set the sender address */
4032
4033 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4034
4035 /* Ensure that the sender address is fully qualified unless it is the empty
4036 address, which indicates an error message, or doesn't exist (root caller, smtp
4037 interface, no -f argument). */
4038
4039 if (sender_address != NULL && sender_address[0] != 0 &&
4040     sender_address_domain == 0)
4041   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4042     qualify_domain_sender);
4043
4044 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4045
4046 /* Handle a request to verify a list of addresses, or test them for delivery.
4047 This must follow the setting of the sender address, since routers can be
4048 predicated upon the sender. If no arguments are given, read addresses from
4049 stdin. Set debug_level to at least D_v to get full output for address testing.
4050 */
4051
4052 if (verify_address_mode || address_test_mode)
4053   {
4054   int exit_value = 0;
4055   int flags = vopt_qualify;
4056
4057   if (verify_address_mode)
4058     {
4059     if (!verify_as_sender) flags |= vopt_is_recipient;
4060     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4061     }
4062
4063   else
4064     {
4065     flags |= vopt_is_recipient;
4066     debug_selector |= D_v;
4067     debug_file = stderr;
4068     debug_fd = fileno(debug_file);
4069     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4070     }
4071
4072   if (recipients_arg < argc)
4073     {
4074     while (recipients_arg < argc)
4075       {
4076       uschar *s = argv[recipients_arg++];
4077       while (*s != 0)
4078         {
4079         BOOL finished = FALSE;
4080         uschar *ss = parse_find_address_end(s, FALSE);
4081         if (*ss == ',') *ss = 0; else finished = TRUE;
4082         test_address(s, flags, &exit_value);
4083         s = ss;
4084         if (!finished)
4085           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4086         }
4087       }
4088     }
4089
4090   else for (;;)
4091     {
4092     uschar *s = get_stdinput(NULL, NULL);
4093     if (s == NULL) break;
4094     test_address(s, flags, &exit_value);
4095     }
4096
4097   route_tidyup();
4098   exim_exit(exit_value);
4099   }
4100
4101 /* Handle expansion checking */
4102
4103 if (expansion_test)
4104   {
4105   if (recipients_arg < argc)
4106     {
4107     while (recipients_arg < argc)
4108       {
4109       uschar *s = argv[recipients_arg++];
4110       uschar *ss = expand_string(s);
4111       if (ss == NULL)
4112         printf ("Failed: %s\n", expand_string_message);
4113       else printf("%s\n", CS ss);
4114       }
4115     }
4116
4117   /* Read stdin */
4118
4119   else
4120     {
4121     char *(*fn_readline)(char *) = NULL;
4122     char *(*fn_addhist)(char *) = NULL;
4123
4124     #ifdef USE_READLINE
4125     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4126     #endif
4127
4128     for (;;)
4129       {
4130       uschar *ss;
4131       uschar *source = get_stdinput(fn_readline, fn_addhist);
4132       if (source == NULL) break;
4133       ss = expand_string(source);
4134       if (ss == NULL)
4135         printf ("Failed: %s\n", expand_string_message);
4136       else printf("%s\n", CS ss);
4137       }
4138
4139     #ifdef USE_READLINE
4140     if (dlhandle != NULL) dlclose(dlhandle);
4141     #endif
4142     }
4143
4144   exim_exit(EXIT_SUCCESS);
4145   }
4146
4147
4148 /* The active host name is normally the primary host name, but it can be varied
4149 for hosts that want to play several parts at once. We need to ensure that it is
4150 set for host checking, and for receiving messages. */
4151
4152 smtp_active_hostname = primary_hostname;
4153 if (raw_active_hostname != NULL)
4154   {
4155   uschar *nah = expand_string(raw_active_hostname);
4156   if (nah == NULL)
4157     {
4158     if (!expand_string_forcedfail)
4159       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4160         "(smtp_active_hostname): %s", raw_active_hostname,
4161         expand_string_message);
4162     }
4163   else if (nah[0] != 0) smtp_active_hostname = nah;
4164   }
4165
4166 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4167 given IP address so that the blocking and relay configuration can be tested. An
4168 RFC 1413 call is made only if we are running in the test harness and an
4169 incoming interface and both ports are specified, because there is no TCP/IP
4170 call to find the ident for. */
4171
4172 if (host_checking)
4173   {
4174   int x[4];
4175   int size;
4176
4177   sender_ident = NULL;
4178   if (running_in_test_harness && sender_host_port != 0 &&
4179       interface_address != NULL && interface_port != 0)
4180     verify_get_ident(1413);
4181
4182   /* In case the given address is a non-canonical IPv6 address, canonicize
4183   it. The code works for both IPv4 and IPv6, as it happens. */
4184
4185   size = host_aton(sender_host_address, x);
4186   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4187   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4188
4189   /* Now set up for testing */
4190
4191   host_build_sender_fullhost();
4192   smtp_input = TRUE;
4193   smtp_in = stdin;
4194   smtp_out = stdout;
4195   sender_local = FALSE;
4196   sender_host_notsocket = TRUE;
4197   debug_file = stderr;
4198   debug_fd = fileno(debug_file);
4199   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4200     "**** but without any ident (RFC 1413) callback.\n"
4201     "**** This is not for real!\n\n",
4202       sender_host_address);
4203
4204   if (verify_check_host(&hosts_connection_nolog) == OK)
4205     log_write_selector &= ~L_smtp_connection;
4206   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4207
4208   if (smtp_start_session())
4209     {
4210     reset_point = store_get(0);
4211     for (;;)
4212       {
4213       store_reset(reset_point);
4214       if (smtp_setup_msg() <= 0) break;
4215       if (!receive_msg(FALSE)) break;
4216       }
4217     }
4218   exim_exit(EXIT_SUCCESS);
4219   }
4220
4221
4222 /* Arrange for message reception if recipients or SMTP were specified;
4223 otherwise complain unless a version print (-bV) happened or this is a filter
4224 verification test. In the former case, show the configuration file name. */
4225
4226 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4227   {
4228   if (version_printed)
4229     {
4230     printf("Configuration file is %s\n", config_main_filename);
4231     return EXIT_SUCCESS;
4232     }
4233   if (filter_test == FTEST_NONE)
4234     {
4235     fprintf(stderr,
4236 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4237 "not directly from a shell command line. Options and/or arguments control\n"
4238 "what it does when called. For a list of options, see the Exim documentation.\n");
4239     return EXIT_FAILURE;
4240     }
4241   }
4242
4243
4244 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4245 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4246 that we are not called from inetd, because that is rejected above. The
4247 following configuration settings are forced here:
4248
4249   (1) Synchronous delivery (-odi)
4250   (2) Errors to stderr (-oep == -oeq)
4251   (3) No parallel remote delivery
4252   (4) Unprivileged delivery
4253
4254 We don't force overall queueing options because there are several of them;
4255 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4256 to override any SMTP queueing. */
4257
4258 if (mua_wrapper)
4259   {
4260   synchronous_delivery = TRUE;
4261   arg_error_handling = ERRORS_STDERR;
4262   remote_max_parallel = 1;
4263   deliver_drop_privilege = TRUE;
4264   queue_smtp = FALSE;
4265   queue_smtp_domains = NULL;
4266   }
4267
4268
4269 /* Prepare to accept one or more new messages on the standard input. When a
4270 message has been read, its id is returned in message_id[]. If doing immediate
4271 delivery, we fork a delivery process for each received message, except for the
4272 last one, where we can save a process switch.
4273
4274 It is only in non-smtp mode that error_handling is allowed to be changed from
4275 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4276 sendmail error modes other than -oem ever actually used? Later: yes.) */
4277
4278 if (!smtp_input) error_handling = arg_error_handling;
4279
4280 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4281 logging being sent down the socket and make an identd call to get the
4282 sender_ident. */
4283
4284 else if (is_inetd)
4285   {
4286   (void)fclose(stderr);
4287   exim_nullstd();                       /* Re-open to /dev/null */
4288   verify_get_ident(IDENT_PORT);
4289   host_build_sender_fullhost();
4290   set_process_info("handling incoming connection from %s via inetd",
4291     sender_fullhost);
4292   }
4293
4294 /* If the sender host address has been set, build sender_fullhost if it hasn't
4295 already been done (which it will have been for inetd). This caters for the
4296 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4297 so that the test for IP options is skipped for -bs input. */
4298
4299 if (sender_host_address != NULL && sender_fullhost == NULL)
4300   {
4301   host_build_sender_fullhost();
4302   set_process_info("handling incoming connection from %s via -oMa",
4303     sender_fullhost);
4304   sender_host_notsocket = TRUE;
4305   }
4306
4307 /* Otherwise, set the sender host as unknown except for inetd calls. This
4308 prevents host checking in the case of -bs not from inetd and also for -bS. */
4309
4310 else if (!is_inetd) sender_host_unknown = TRUE;
4311
4312 /* If stdout does not exist, then dup stdin to stdout. This can happen
4313 if exim is started from inetd. In this case fd 0 will be set to the socket,
4314 but fd 1 will not be set. This also happens for passed SMTP channels. */
4315
4316 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4317
4318 /* Set up the incoming protocol name and the state of the program. Root
4319 is allowed to force received protocol via the -oMr option above, and if we are
4320 in a non-local SMTP state it means we have come via inetd and the process info
4321 has already been set up. We don't set received_protocol here for smtp input,
4322 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4323
4324 if (smtp_input)
4325   {
4326   if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4327     sender_address);
4328   }
4329 else
4330   {
4331   if (received_protocol == NULL)
4332     received_protocol = string_sprintf("local%s", called_as);
4333   set_process_info("accepting a local non-SMTP message from <%s>",
4334     sender_address);
4335   }
4336
4337 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4338 set) */
4339
4340 queue_check_only();
4341 local_queue_only = queue_only;
4342
4343 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4344 the spool if so configured. On failure, we must not attempt to send an error
4345 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4346 error code is given.) */
4347
4348 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4349   {
4350   fprintf(stderr, "exim: insufficient disk space\n");
4351   return EXIT_FAILURE;
4352   }
4353
4354 /* If this is smtp input of any kind, handle the start of the SMTP
4355 session. */
4356
4357 if (smtp_input)
4358   {
4359   smtp_in = stdin;
4360   smtp_out = stdout;
4361   if (verify_check_host(&hosts_connection_nolog) == OK)
4362     log_write_selector &= ~L_smtp_connection;
4363   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4364   if (!smtp_start_session())
4365     {
4366     mac_smtp_fflush();
4367     exim_exit(EXIT_SUCCESS);
4368     }
4369   }
4370
4371 /* Otherwise, set up the input size limit here */
4372
4373 else
4374   {
4375   thismessage_size_limit = expand_string_integer(message_size_limit);
4376   if (thismessage_size_limit < 0)
4377     {
4378     if (thismessage_size_limit == -1)
4379       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4380         "message_size_limit: %s", expand_string_message);
4381     else
4382       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4383         "message_size_limit: %s", expand_string_message);
4384     }
4385   }
4386
4387 /* Loop for several messages when reading SMTP input. If we fork any child
4388 processes, we don't want to wait for them unless synchronous delivery is
4389 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4390 same as SIG_DFL, despite the fact that documentation often lists the default as
4391 "ignore". This is a confusing area. This is what I know:
4392
4393 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4394 processes that complete simply to go away without ever becoming defunct. You
4395 can't then wait for them - but we don't want to wait for them in the
4396 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4397 happen for all OS (e.g. *BSD is different).
4398
4399 But that's not the end of the story. Some (many? all?) systems have the
4400 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4401 has by default, so it seems that the difference is merely one of default
4402 (compare restarting vs non-restarting signals).
4403
4404 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4405 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4406 of the loop below. Paranoia rules.
4407
4408 February 2003: That's *still* not the end of the story. There are now versions
4409 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4410 process then calls waitpid(), a grumble is written to the system log, because
4411 this is logically inconsistent. In other words, it doesn't like the paranoia.
4412 As a consequenc of this, the waitpid() below is now excluded if we are sure
4413 that SIG_IGN works. */
4414
4415 if (!synchronous_delivery)
4416   {
4417   #ifdef SA_NOCLDWAIT
4418   struct sigaction act;
4419   act.sa_handler = SIG_IGN;
4420   sigemptyset(&(act.sa_mask));
4421   act.sa_flags = SA_NOCLDWAIT;
4422   sigaction(SIGCHLD, &act, NULL);
4423   #else
4424   signal(SIGCHLD, SIG_IGN);
4425   #endif
4426   }
4427
4428 /* Save the current store pool point, for resetting at the start of
4429 each message, and save the real sender address, if any. */
4430
4431 reset_point = store_get(0);
4432 real_sender_address = sender_address;
4433
4434 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4435 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4436 collapsed). */
4437
4438 while (more)
4439   {
4440   store_reset(reset_point);
4441   message_id[0] = 0;
4442
4443   /* In the SMTP case, we have to handle the initial SMTP input and build the
4444   recipients list, before calling receive_msg() to read the message proper.
4445   Whatever sender address is actually given in the SMTP transaction is
4446   actually ignored for local senders - we use the actual sender, which is
4447   normally either the underlying user running this process or a -f argument
4448   provided by a trusted caller. It is saved in real_sender_address.
4449
4450   However, if this value is NULL, we are dealing with a trusted caller when
4451   -f was not used; in this case, the SMTP sender is allowed to stand.
4452
4453   Also, if untrusted_set_sender is set, we permit sender addresses that match
4454   anything in its list.
4455
4456   The variable raw_sender_address holds the sender address before rewriting. */
4457
4458   if (smtp_input)
4459     {
4460     int rc;
4461     if ((rc = smtp_setup_msg()) > 0)
4462       {
4463       if (real_sender_address != NULL &&
4464           !receive_check_set_sender(sender_address))
4465         {
4466         sender_address = raw_sender = real_sender_address;
4467         sender_address_unrewritten = NULL;
4468         }
4469       more = receive_msg(extract_recipients);
4470       if (message_id[0] == 0)
4471         {
4472         if (more) continue;
4473         exim_exit(EXIT_FAILURE);
4474         }
4475       }
4476     else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4477     }
4478
4479   /* In the non-SMTP case, we have all the information from the command
4480   line, but must process it in case it is in the more general RFC822
4481   format, and in any case, to detect syntax errors. Also, it appears that
4482   the use of comma-separated lists as single arguments is common, so we
4483   had better support them. */
4484
4485   else
4486     {
4487     int i;
4488     int rcount = 0;
4489     int count = argc - recipients_arg;
4490     uschar **list = argv + recipients_arg;
4491
4492     /* These options cannot be changed dynamically for non-SMTP messages */
4493
4494     active_local_sender_retain = local_sender_retain;
4495     active_local_from_check = local_from_check;
4496
4497     /* Save before any rewriting */
4498
4499     raw_sender = string_copy(sender_address);
4500
4501     /* Loop for each argument */
4502
4503     for (i = 0; i < count; i++)
4504       {
4505       int start, end, domain;
4506       uschar *errmess;
4507       uschar *s = list[i];
4508
4509       /* Loop for each comma-separated address */
4510
4511       while (*s != 0)
4512         {
4513         BOOL finished = FALSE;
4514         uschar *recipient;
4515         uschar *ss = parse_find_address_end(s, FALSE);
4516
4517         if (*ss == ',') *ss = 0; else finished = TRUE;
4518
4519         /* Check max recipients - if -t was used, these aren't recipients */
4520
4521         if (recipients_max > 0 && ++rcount > recipients_max &&
4522             !extract_recipients)
4523           {
4524           if (error_handling == ERRORS_STDERR)
4525             {
4526             fprintf(stderr, "exim: too many recipients\n");
4527             exim_exit(EXIT_FAILURE);
4528             }
4529           else
4530             {
4531             return
4532               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4533                 errors_sender_rc : EXIT_FAILURE;
4534             }
4535           }
4536
4537         recipient =
4538           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4539
4540         if (domain == 0 && !allow_unqualified_recipient)
4541           {
4542           recipient = NULL;
4543           errmess = US"unqualified recipient address not allowed";
4544           }
4545
4546         if (recipient == NULL)
4547           {
4548           if (error_handling == ERRORS_STDERR)
4549             {
4550             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4551               string_printing(list[i]), errmess);
4552             exim_exit(EXIT_FAILURE);
4553             }
4554           else
4555             {
4556             error_block eblock;
4557             eblock.next = NULL;
4558             eblock.text1 = string_printing(list[i]);
4559             eblock.text2 = errmess;
4560             return
4561               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4562                 errors_sender_rc : EXIT_FAILURE;
4563             }
4564           }
4565
4566         receive_add_recipient(recipient, -1);
4567         s = ss;
4568         if (!finished)
4569           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4570         }
4571       }
4572
4573     /* Show the recipients when debugging */
4574
4575     DEBUG(D_receive)
4576       {
4577       int i;
4578       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4579       if (recipients_list != NULL)
4580         {
4581         debug_printf("Recipients:\n");
4582         for (i = 0; i < recipients_count; i++)
4583           debug_printf("  %s\n", recipients_list[i].address);
4584         }
4585       }
4586
4587     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4588     will just read the headers for the message, and not write anything onto the
4589     spool. */
4590
4591     message_ended = END_NOTENDED;
4592     more = receive_msg(extract_recipients);
4593
4594     /* more is always FALSE here (not SMTP message) when reading a message
4595     for real; when reading the headers of a message for filter testing,
4596     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4597
4598     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4599     }  /* Non-SMTP message reception */
4600
4601   /* If this is a filter testing run, there are headers in store, but
4602   no message on the spool. Run the filtering code in testing mode, setting
4603   the domain to the qualify domain and the local part to the current user,
4604   unless they have been set by options. The prefix and suffix are left unset
4605   unless specified. The the return path is set to to the sender unless it has
4606   already been set from a return-path header in the message. */
4607
4608   if (filter_test != FTEST_NONE)
4609     {
4610     deliver_domain = (ftest_domain != NULL)?
4611       ftest_domain : qualify_domain_recipient;
4612     deliver_domain_orig = deliver_domain;
4613     deliver_localpart = (ftest_localpart != NULL)?
4614       ftest_localpart : originator_login;
4615     deliver_localpart_orig = deliver_localpart;
4616     deliver_localpart_prefix = ftest_prefix;
4617     deliver_localpart_suffix = ftest_suffix;
4618     deliver_home = originator_home;
4619
4620     if (return_path == NULL)
4621       {
4622       printf("Return-path copied from sender\n");
4623       return_path = string_copy(sender_address);
4624       }
4625     else
4626       {
4627       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4628       }
4629     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4630
4631     receive_add_recipient(
4632       string_sprintf("%s%s%s@%s",
4633         (ftest_prefix == NULL)? US"" : ftest_prefix,
4634         deliver_localpart,
4635         (ftest_suffix == NULL)? US"" : ftest_suffix,
4636         deliver_domain), -1);
4637
4638     printf("Recipient   = %s\n", recipients_list[0].address);
4639     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4640     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4641
4642     (void)chdir("/");   /* Get away from wherever the user is running this from */
4643
4644     /* Now we run either a system filter test, or a user filter test, or both.
4645     In the latter case, headers added by the system filter will persist and be
4646     available to the user filter. We need to copy the filter variables
4647     explicitly. */
4648
4649     if ((filter_test & FTEST_SYSTEM) != 0)
4650       {
4651       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4652         exim_exit(EXIT_FAILURE);
4653       }
4654
4655     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4656
4657     if ((filter_test & FTEST_USER) != 0)
4658       {
4659       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4660         exim_exit(EXIT_FAILURE);
4661       }
4662
4663     exim_exit(EXIT_SUCCESS);
4664     }
4665
4666   /* Else act on the result of message reception. We should not get here unless
4667   message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4668   TRUE. If it is not, check on the number of messages received in this
4669   connection. If that's OK and queue_only_load is set, check that the load
4670   average is below it. If it is not, set local_queue_only TRUE. Note that it
4671   then remains this way for any subsequent messages on the same SMTP connection.
4672   This is a deliberate choice; even though the load average may fall, it
4673   doesn't seem right to deliver later messages on the same call when not
4674   delivering earlier ones. */
4675
4676   if (!local_queue_only)
4677     {
4678     if (smtp_accept_queue_per_connection > 0 &&
4679         receive_messagecount > smtp_accept_queue_per_connection)
4680       {
4681       local_queue_only = TRUE;
4682       queue_only_reason = 2;
4683       }
4684     else if (queue_only_load >= 0)
4685       {
4686       local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4687       if (local_queue_only) queue_only_reason = 3;
4688       }
4689     }
4690
4691   /* If running as an MUA wrapper, all queueing options and freezing options
4692   are ignored. */
4693
4694   if (mua_wrapper)
4695     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4696
4697   /* Log the queueing here, when it will get a message id attached, but
4698   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4699   connections). */
4700
4701   if (local_queue_only) switch(queue_only_reason)
4702     {
4703     case 2:
4704     log_write(L_delay_delivery,
4705               LOG_MAIN, "no immediate delivery: more than %d messages "
4706       "received in one connection", smtp_accept_queue_per_connection);
4707     break;
4708
4709     case 3:
4710     log_write(L_delay_delivery,
4711               LOG_MAIN, "no immediate delivery: load average %.2f",
4712               (double)load_average/1000.0);
4713     break;
4714     }
4715
4716   /* Else do the delivery unless the ACL or local_scan() called for queue only
4717   or froze the message. Always deliver in a separate process. A fork failure is
4718   not a disaster, as the delivery will eventually happen on a subsequent queue
4719   run. The search cache must be tidied before the fork, as the parent will
4720   do it before exiting. The child will trigger a lookup failure and
4721   thereby defer the delivery if it tries to use (for example) a cached ldap
4722   connection that the parent has called unbind on. */
4723
4724   else if (!queue_only_policy && !deliver_freeze)
4725     {
4726     pid_t pid;
4727     search_tidyup();
4728
4729     if ((pid = fork()) == 0)
4730       {
4731       int rc;
4732       close_unwanted();      /* Close unwanted file descriptors and TLS */
4733       exim_nullstd();        /* Ensure std{in,out,err} exist */
4734
4735       /* Occasionally in the test harness we don't have synchronous delivery
4736       set (can happen with bounces). In that case, let the old process finish
4737       before continuing, to keep the debug output the same. */
4738
4739       if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4740
4741       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4742       mode, deliver_drop_privilege is forced TRUE). */
4743
4744       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4745         {
4746         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4747           message_id);
4748         /* Control does not return here. */
4749         }
4750
4751       /* No need to re-exec */
4752
4753       rc = deliver_message(message_id, FALSE, FALSE);
4754       search_tidyup();
4755       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4756         EXIT_SUCCESS : EXIT_FAILURE);
4757       }
4758
4759     if (pid < 0)
4760       {
4761       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4762         "process: %s", strerror(errno));
4763       }
4764
4765     /* In the parent, wait if synchronous delivery is required. This will
4766     always be the case in MUA wrapper mode. */
4767
4768     else if (synchronous_delivery)
4769       {
4770       int status;
4771       while (wait(&status) != pid);
4772       if ((status & 0x00ff) != 0)
4773         log_write(0, LOG_MAIN|LOG_PANIC,
4774           "process %d crashed with signal %d while delivering %s",
4775           (int)pid, status & 0x00ff, message_id);
4776       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4777       }
4778     }
4779
4780   /* The loop will repeat if more is TRUE. If we do not know know that the OS
4781   automatically reaps children (see comments above the loop), clear away any
4782   finished subprocesses here, in case there are lots of messages coming in
4783   from the same source. */
4784
4785   #ifndef SIG_IGN_WORKS
4786   while (waitpid(-1, NULL, WNOHANG) > 0);
4787   #endif
4788   }
4789
4790 exim_exit(EXIT_SUCCESS);   /* Never returns */
4791 return 0;                  /* To stop compiler warning */
4792 }
4793
4794 /* End of exim.c */