src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.30 2005/10/20 15:19:13 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 SUPPORT_TRANSLATE_IP_ADDRESS
 865   fprintf(f, " translate_ip_address");
 866 #endif
 867 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 868   fprintf(f, " move_frozen_messages");
 869 #endif
 870 #ifdef WITH_CONTENT_SCAN
 871   fprintf(f, " Content_Scanning");
 872 #endif
 873 #ifdef WITH_OLD_DEMIME
 874   fprintf(f, " Old_Demime");
 875 #endif
 876 #ifdef EXPERIMENTAL_SPF
 877   fprintf(f, " Experimental_SPF");
 878 #endif
 879 #ifdef EXPERIMENTAL_SRS
 880   fprintf(f, " Experimental_SRS");
 881 #endif
 882 #ifdef EXPERIMENTAL_BRIGHTMAIL
 883   fprintf(f, " Experimental_Brightmail");
 884 #endif
 885 #ifdef EXPERIMENTAL_DOMAINKEYS
 886   fprintf(f, " Experimental_DomainKeys");
 887 #endif
 888 fprintf(f, "\n");
 889
 890 fprintf(f, "Lookups:");
 891 #ifdef LOOKUP_LSEARCH
 892   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 893 #endif
 894 #ifdef LOOKUP_CDB
 895   fprintf(f, " cdb");
 896 #endif
 897 #ifdef LOOKUP_DBM
 898   fprintf(f, " dbm dbmnz");
 899 #endif
 900 #ifdef LOOKUP_DNSDB
 901   fprintf(f, " dnsdb");
 902 #endif
 903 #ifdef LOOKUP_DSEARCH
 904   fprintf(f, " dsearch");
 905 #endif
 906 #ifdef LOOKUP_IBASE
 907   fprintf(f, " ibase");
 908 #endif
 909 #ifdef LOOKUP_LDAP
 910   fprintf(f, " ldap ldapdn ldapm");
 911 #endif
 912 #ifdef LOOKUP_MYSQL
 913   fprintf(f, " mysql");
 914 #endif
 915 #ifdef LOOKUP_NIS
 916   fprintf(f, " nis nis0");
 917 #endif
 918 #ifdef LOOKUP_NISPLUS
 919   fprintf(f, " nisplus");
 920 #endif
 921 #ifdef LOOKUP_ORACLE
 922   fprintf(f, " oracle");
 923 #endif
 924 #ifdef LOOKUP_PASSWD
 925   fprintf(f, " passwd");
 926 #endif
 927 #ifdef LOOKUP_PGSQL
 928   fprintf(f, " pgsql");
 929 #endif
 930 #ifdef LOOKUP_SQLITE
 931   fprintf(f, " sqlite");
 932 #endif
 933 #ifdef LOOKUP_TESTDB
 934   fprintf(f, " testdb");
 935 #endif
 936 #ifdef LOOKUP_WHOSON
 937   fprintf(f, " whoson");
 938 #endif
 939 fprintf(f, "\n");
 940
 941 fprintf(f, "Authenticators:");
 942 #ifdef AUTH_CRAM_MD5
 943   fprintf(f, " cram_md5");
 944 #endif
 945 #ifdef AUTH_CYRUS_SASL
 946   fprintf(f, " cyrus_sasl");
 947 #endif
 948 #ifdef AUTH_PLAINTEXT
 949   fprintf(f, " plaintext");
 950 #endif
 951 #ifdef AUTH_SPA
 952   fprintf(f, " spa");
 953 #endif
 954 fprintf(f, "\n");
 955
 956 fprintf(f, "Routers:");
 957 #ifdef ROUTER_ACCEPT
 958   fprintf(f, " accept");
 959 #endif
 960 #ifdef ROUTER_DNSLOOKUP
 961   fprintf(f, " dnslookup");
 962 #endif
 963 #ifdef ROUTER_IPLITERAL
 964   fprintf(f, " ipliteral");
 965 #endif
 966 #ifdef ROUTER_IPLOOKUP
 967   fprintf(f, " iplookup");
 968 #endif
 969 #ifdef ROUTER_MANUALROUTE
 970   fprintf(f, " manualroute");
 971 #endif
 972 #ifdef ROUTER_QUERYPROGRAM
 973   fprintf(f, " queryprogram");
 974 #endif
 975 #ifdef ROUTER_REDIRECT
 976   fprintf(f, " redirect");
 977 #endif
 978 fprintf(f, "\n");
 979
 980 fprintf(f, "Transports:");
 981 #ifdef TRANSPORT_APPENDFILE
 982   fprintf(f, " appendfile");
 983   #ifdef SUPPORT_MAILDIR
 984     fprintf(f, "/maildir");
 985   #endif
 986   #ifdef SUPPORT_MAILSTORE
 987     fprintf(f, "/mailstore");
 988   #endif
 989   #ifdef SUPPORT_MBX
 990     fprintf(f, "/mbx");
 991   #endif
 992 #endif
 993 #ifdef TRANSPORT_AUTOREPLY
 994   fprintf(f, " autoreply");
 995 #endif
 996 #ifdef TRANSPORT_LMTP
 997   fprintf(f, " lmtp");
 998 #endif
 999 #ifdef TRANSPORT_PIPE
1000   fprintf(f, " pipe");
1001 #endif
1002 #ifdef TRANSPORT_SMTP
1003   fprintf(f, " smtp");
1004 #endif
1005 fprintf(f, "\n");
1006
1007 if (fixed_never_users[0] > 0)
1008   {
1009   int i;
1010   fprintf(f, "Fixed never_users: ");
1011   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1012     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1013   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1014   }
1015 }
1016
1017
1018
1019
1020 /*************************************************
1021 *               Quote a local part               *
1022 *************************************************/
1023
1024 /* This function is used when a sender address or a From: or Sender: header
1025 line is being created from the caller's login, or from an authenticated_id. It
1026 applies appropriate quoting rules for a local part.
1027
1028 Argument:    the local part
1029 Returns:     the local part, quoted if necessary
1030 */
1031
1032 uschar *
1033 local_part_quote(uschar *lpart)
1034 {
1035 BOOL needs_quote = FALSE;
1036 int size, ptr;
1037 uschar *yield;
1038 uschar *t;
1039
1040 for (t = lpart; !needs_quote && *t != 0; t++)
1041   {
1042   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1043     (*t != '.' || t == lpart || t[1] == 0);
1044   }
1045
1046 if (!needs_quote) return lpart;
1047
1048 size = ptr = 0;
1049 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1050
1051 for (;;)
1052   {
1053   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1054   if (nq == NULL)
1055     {
1056     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1057     break;
1058     }
1059   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1060   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1061   yield = string_cat(yield, &size, &ptr, nq, 1);
1062   lpart = nq + 1;
1063   }
1064
1065 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1066 yield[ptr] = 0;
1067 return yield;
1068 }
1069
1070
1071
1072 #ifdef USE_READLINE
1073 /*************************************************
1074 *         Load readline() functions              *
1075 *************************************************/
1076
1077 /* This function is called from testing executions that read data from stdin,
1078 but only when running as the calling user. Currently, only -be does this. The
1079 function loads the readline() function library and passes back the functions.
1080 On some systems, it needs the curses library, so load that too, but try without
1081 it if loading fails. All this functionality has to be requested at build time.
1082
1083 Arguments:
1084   fn_readline_ptr   pointer to where to put the readline pointer
1085   fn_addhist_ptr    pointer to where to put the addhistory function
1086
1087 Returns:            the dlopen handle or NULL on failure
1088 */
1089
1090 static void *
1091 set_readline(char * (**fn_readline_ptr)(char *),
1092              char * (**fn_addhist_ptr)(char *))
1093 {
1094 void *dlhandle;
1095 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1096
1097 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1098 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1099
1100 if (dlhandle != NULL)
1101   {
1102   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1103   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1104   }
1105 else
1106   {
1107   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1108   }
1109
1110 return dlhandle;
1111 }
1112 #endif
1113
1114
1115
1116 /*************************************************
1117 *    Get a line from stdin for testing things    *
1118 *************************************************/
1119
1120 /* This function is called when running tests that can take a number of lines
1121 of input (for example, -be and -bt). It handles continuations and trailing
1122 spaces. And prompting and a blank line output on eof. If readline() is in use,
1123 the arguments are non-NULL and provide the relevant functions.
1124
1125 Arguments:
1126   fn_readline   readline function or NULL
1127   fn_addhist    addhist function or NULL
1128
1129 Returns:        pointer to dynamic memory, or NULL at end of file
1130 */
1131
1132 static uschar *
1133 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1134 {
1135 int i;
1136 int size = 0;
1137 int ptr = 0;
1138 uschar *yield = NULL;
1139
1140 if (fn_readline == NULL) printf("> ");
1141
1142 for (i = 0;; i++)
1143   {
1144   uschar buffer[1024];
1145   uschar *p, *ss;
1146
1147   #ifdef USE_READLINE
1148   char *readline_line = NULL;
1149   if (fn_readline != NULL)
1150     {
1151     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1152     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1153     p = US readline_line;
1154     }
1155   else
1156   #endif
1157
1158   /* readline() not in use */
1159
1160     {
1161     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1162     p = buffer;
1163     }
1164
1165   /* Handle the line */
1166
1167   ss = p + (int)Ustrlen(p);
1168   while (ss > p && isspace(ss[-1])) ss--;
1169
1170   if (i > 0)
1171     {
1172     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1173     }
1174
1175   yield = string_cat(yield, &size, &ptr, p, ss - p);
1176
1177   #ifdef USE_READLINE
1178   if (fn_readline != NULL) free(readline_line);
1179   #endif
1180
1181   if (ss == p || yield[ptr-1] != '\\')
1182     {
1183     yield[ptr] = 0;
1184     break;
1185     }
1186   yield[--ptr] = 0;
1187   }
1188
1189 if (yield == NULL) printf("\n");
1190 return yield;
1191 }
1192
1193
1194
1195 /*************************************************
1196 *          Entry point and high-level code       *
1197 *************************************************/
1198
1199 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1200 the appropriate action. All the necessary functions are present in the one
1201 binary. I originally thought one should split it up, but it turns out that so
1202 much of the apparatus is needed in each chunk that one might as well just have
1203 it all available all the time, which then makes the coding easier as well.
1204
1205 Arguments:
1206   argc      count of entries in argv
1207   argv      argument strings, with argv[0] being the program name
1208
1209 Returns:    EXIT_SUCCESS if terminated successfully
1210             EXIT_FAILURE otherwise, except when a message has been sent
1211               to the sender, and -oee was given
1212 */
1213
1214 int
1215 main(int argc, char **cargv)
1216 {
1217 uschar **argv = USS cargv;
1218 int  arg_receive_timeout = -1;
1219 int  arg_smtp_receive_timeout = -1;
1220 int  arg_error_handling = error_handling;
1221 int  filter_sfd = -1;
1222 int  filter_ufd = -1;
1223 int  group_count;
1224 int  i;
1225 int  list_queue_option = 0;
1226 int  msg_action = 0;
1227 int  msg_action_arg = -1;
1228 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1229 int  queue_only_reason = 0;
1230 #ifdef EXIM_PERL
1231 int  perl_start_option = 0;
1232 #endif
1233 int  recipients_arg = argc;
1234 int  sender_address_domain = 0;
1235 int  test_retry_arg = -1;
1236 int  test_rewrite_arg = -1;
1237 BOOL arg_queue_only = FALSE;
1238 BOOL bi_option = FALSE;
1239 BOOL checking = FALSE;
1240 BOOL count_queue = FALSE;
1241 BOOL expansion_test = FALSE;
1242 BOOL extract_recipients = FALSE;
1243 BOOL forced_delivery = FALSE;
1244 BOOL f_end_dot = FALSE;
1245 BOOL deliver_give_up = FALSE;
1246 BOOL list_queue = FALSE;
1247 BOOL list_options = FALSE;
1248 BOOL local_queue_only;
1249 BOOL more = TRUE;
1250 BOOL one_msg_action = FALSE;
1251 BOOL queue_only_set = FALSE;
1252 BOOL receiving_message = TRUE;
1253 BOOL unprivileged;
1254 BOOL removed_privilege = FALSE;
1255 BOOL verify_address_mode = FALSE;
1256 BOOL verify_as_sender = FALSE;
1257 BOOL version_printed = FALSE;
1258 uschar *alias_arg = NULL;
1259 uschar *called_as = US"";
1260 uschar *start_queue_run_id = NULL;
1261 uschar *stop_queue_run_id = NULL;
1262 uschar *ftest_domain = NULL;
1263 uschar *ftest_localpart = NULL;
1264 uschar *ftest_prefix = NULL;
1265 uschar *ftest_suffix = NULL;
1266 uschar *real_sender_address;
1267 uschar *originator_home = US"/";
1268 void *reset_point;
1269
1270 struct passwd *pw;
1271 struct stat statbuf;
1272 pid_t passed_qr_pid = (pid_t)0;
1273 int passed_qr_pipe = -1;
1274 gid_t group_list[NGROUPS_MAX];
1275
1276 /* Possible options for -R and -S */
1277
1278 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1279
1280 /* Need to define this in case we need to change the environment in order
1281 to get rid of a bogus time zone. We have to make it char rather than uschar
1282 because some OS define it in /usr/include/unistd.h. */
1283
1284 extern char **environ;
1285
1286 /* If the Exim user and/or group and/or the configuration file owner/group were
1287 defined by ref:name at build time, we must now find the actual uid/gid values.
1288 This is a feature to make the lives of binary distributors easier. */
1289
1290 #ifdef EXIM_USERNAME
1291 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1292   {
1293   exim_gid = pw->pw_gid;
1294   }
1295 else
1296   {
1297   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1298     EXIM_USERNAME);
1299   exit(EXIT_FAILURE);
1300   }
1301 #endif
1302
1303 #ifdef EXIM_GROUPNAME
1304 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1305   {
1306   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1307     EXIM_GROUPNAME);
1308   exit(EXIT_FAILURE);
1309   }
1310 #endif
1311
1312 #ifdef CONFIGURE_OWNERNAME
1313 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1314   {
1315   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1316     CONFIGURE_OWNERNAME);
1317   exit(EXIT_FAILURE);
1318   }
1319 #endif
1320
1321 #ifdef CONFIGURE_GROUPNAME
1322 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1323   {
1324   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1325     CONFIGURE_GROUPNAME);
1326   exit(EXIT_FAILURE);
1327   }
1328 #endif
1329
1330 /* In the Cygwin environment, some initialization needs doing. It is fudged
1331 in by means of this macro. */
1332
1333 #ifdef OS_INIT
1334 OS_INIT
1335 #endif
1336
1337 /* Check a field which is patched when we are running Exim within its
1338 testing harness; do a fast initial check, and then the whole thing. */
1339
1340 running_in_test_harness =
1341   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1342
1343 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1344 at the start of a program; however, it seems that some environments do not
1345 follow this. A "strange" locale can affect the formatting of timestamps, so we
1346 make quite sure. */
1347
1348 setlocale(LC_ALL, "C");
1349
1350 /* Set up the default handler for timing using alarm(). */
1351
1352 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1353
1354 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1355 because store_malloc writes a log entry on failure. */
1356
1357 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1358 if (log_buffer == NULL)
1359   {
1360   fprintf(stderr, "exim: failed to get store for log buffer\n");
1361   exit(EXIT_FAILURE);
1362   }
1363
1364 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1365 NULL when the daemon is run and the file is closed. We have to use this
1366 indirection, because some systems don't allow writing to the variable "stderr".
1367 */
1368
1369 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1370
1371 /* Arrange for the PCRE regex library to use our store functions. Note that
1372 the normal calls are actually macros that add additional arguments for
1373 debugging purposes so we have to assign specially constructed functions here.
1374 The default is to use store in the stacking pool, but this is overridden in the
1375 regex_must_compile() function. */
1376
1377 pcre_malloc = function_store_get;
1378 pcre_free = function_dummy_free;
1379
1380 /* Ensure there is a big buffer for temporary use in several places. It is put
1381 in malloc store so that it can be freed for enlargement if necessary. */
1382
1383 big_buffer = store_malloc(big_buffer_size);
1384
1385 /* Set up the handler for the data request signal, and set the initial
1386 descriptive text. */
1387
1388 set_process_info("initializing");
1389 os_restarting_signal(SIGUSR1, usr1_handler);
1390
1391 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1392 in the daemon code. For the rest of Exim's uses, we ignore it. */
1393
1394 signal(SIGHUP, SIG_IGN);
1395
1396 /* We don't want to die on pipe errors as the code is written to handle
1397 the write error instead. */
1398
1399 signal(SIGPIPE, SIG_IGN);
1400
1401 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1402 set to SIG_IGN. This causes subprocesses that complete before the parent
1403 process waits for them not to hang around, so when Exim calls wait(), nothing
1404 is there. The wait() code has been made robust against this, but let's ensure
1405 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1406 ending status. We use sigaction rather than plain signal() on those OS where
1407 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1408 problem on AIX with this.) */
1409
1410 #ifdef SA_NOCLDWAIT
1411   {
1412   struct sigaction act;
1413   act.sa_handler = SIG_DFL;
1414   sigemptyset(&(act.sa_mask));
1415   act.sa_flags = 0;
1416   sigaction(SIGCHLD, &act, NULL);
1417   }
1418 #else
1419 signal(SIGCHLD, SIG_DFL);
1420 #endif
1421
1422 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1423 SIGHUP. */
1424
1425 sighup_argv = argv;
1426
1427 /* Set up the version number. Set up the leading 'E' for the external form of
1428 message ids, set the pointer to the internal form, and initialize it to
1429 indicate no message being processed. */
1430
1431 version_init();
1432 message_id_option[0] = '-';
1433 message_id_external = message_id_option + 1;
1434 message_id_external[0] = 'E';
1435 message_id = message_id_external + 1;
1436 message_id[0] = 0;
1437
1438 /* Set the umask to zero so that any files that Exim creates are created
1439 with the modes that it specifies. */
1440
1441 umask(0);
1442
1443 /* Precompile the regular expression for matching a message id. Keep this in
1444 step with the code that generates ids in the accept.c module. We need to do
1445 this here, because the -M options check their arguments for syntactic validity
1446 using mac_ismsgid, which uses this. */
1447
1448 regex_ismsgid =
1449   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1450
1451 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1452 this seems to be a generally accepted convention, since one finds symbolic
1453 links called "mailq" in standard OS configurations. */
1454
1455 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1456     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1457   {
1458   list_queue = TRUE;
1459   receiving_message = FALSE;
1460   called_as = US"-mailq";
1461   }
1462
1463 /* If the program is called as "rmail" treat it as equivalent to
1464 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1465 i.e. preventing a single dot on a line from terminating the message, and
1466 returning with zero return code, even in cases of error (provided an error
1467 message has been sent). */
1468
1469 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1470     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1471   {
1472   dot_ends = FALSE;
1473   called_as = US"-rmail";
1474   errors_sender_rc = EXIT_SUCCESS;
1475   }
1476
1477 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1478 this is a smail convention. */
1479
1480 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1481     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1482   {
1483   smtp_input = smtp_batched_input = TRUE;
1484   called_as = US"-rsmtp";
1485   }
1486
1487 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1488 this is a smail convention. */
1489
1490 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1491     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1492   {
1493   queue_interval = 0;
1494   receiving_message = FALSE;
1495   called_as = US"-runq";
1496   }
1497
1498 /* If the program is called as "newaliases" treat it as equivalent to
1499 "exim -bi"; this is a sendmail convention. */
1500
1501 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1502     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1503   {
1504   bi_option = TRUE;
1505   receiving_message = FALSE;
1506   called_as = US"-newaliases";
1507   }
1508
1509 /* Save the original effective uid for a couple of uses later. It should
1510 normally be root, but in some esoteric environments it may not be. */
1511
1512 original_euid = geteuid();
1513
1514 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1515 to be the same as the real ones. This makes a difference only if Exim is setuid
1516 (or setgid) to something other than root, which could be the case in some
1517 special configurations. */
1518
1519 real_uid = getuid();
1520 real_gid = getgid();
1521
1522 if (real_uid == root_uid)
1523   {
1524   setgid(real_gid);
1525   setuid(real_uid);
1526   }
1527
1528 /* If neither the original real uid nor the original euid was root, Exim is
1529 running in an unprivileged state. */
1530
1531 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1532
1533 /* If the first argument is --help, pretend there are no arguments. This will
1534 cause a brief message to be given. */
1535
1536 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1537
1538 /* Scan the program's arguments. Some can be dealt with right away; others are
1539 simply recorded for checking and handling afterwards. Do a high-level switch
1540 on the second character (the one after '-'), to save some effort. */
1541
1542 for (i = 1; i < argc; i++)
1543   {
1544   BOOL badarg = FALSE;
1545   uschar *arg = argv[i];
1546   uschar *argrest;
1547   int switchchar;
1548
1549   /* An argument not starting with '-' is the start of a recipients list;
1550   break out of the options-scanning loop. */
1551
1552   if (arg[0] != '-')
1553     {
1554     recipients_arg = i;
1555     break;
1556     }
1557
1558   /* An option consistion of -- terminates the options */
1559
1560   if (Ustrcmp(arg, "--") == 0)
1561     {
1562     recipients_arg = i + 1;
1563     break;
1564     }
1565
1566   /* Handle flagged options */
1567
1568   switchchar = arg[1];
1569   argrest = arg+2;
1570
1571   /* Make all -ex options synonymous with -oex arguments, since that
1572   is assumed by various callers. Also make -qR options synonymous with -R
1573   options, as that seems to be required as well. Allow for -qqR too, and
1574   the same for -S options. */
1575
1576   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1577       Ustrncmp(arg+1, "qR", 2) == 0 ||
1578       Ustrncmp(arg+1, "qS", 2) == 0)
1579     {
1580     switchchar = arg[2];
1581     argrest++;
1582     }
1583   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1584     {
1585     switchchar = arg[3];
1586     argrest += 2;
1587     queue_2stage = TRUE;
1588     }
1589
1590   /* Make -r synonymous with -f, since it is a documented alias */
1591
1592   else if (arg[1] == 'r') switchchar = 'f';
1593
1594   /* Make -ov synonymous with -v */
1595
1596   else if (Ustrcmp(arg, "-ov") == 0)
1597     {
1598     switchchar = 'v';
1599     argrest++;
1600     }
1601
1602   /* High-level switch on active initial letter */
1603
1604   switch(switchchar)
1605     {
1606     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1607     so has no need of it. */
1608
1609     case 'B':
1610     if (*argrest == 0) i++;       /* Skip over the type */
1611     break;
1612
1613
1614     case 'b':
1615     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1616
1617     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1618        -bdf: Ditto, but in the foreground.
1619     */
1620
1621     if (*argrest == 'd')
1622       {
1623       daemon_listen = TRUE;
1624       if (*(++argrest) == 'f') background_daemon = FALSE;
1625         else if (*argrest != 0) { badarg = TRUE; break; }
1626       }
1627
1628     /* -be: Run in expansion test mode */
1629
1630     else if (*argrest == 'e')
1631       expansion_test = checking = TRUE;
1632
1633     /* -bF:  Run system filter test */
1634
1635     else if (*argrest == 'F')
1636       {
1637       filter_test |= FTEST_SYSTEM;
1638       if (*(++argrest) != 0) { badarg = TRUE; break; }
1639       if (++i < argc) filter_test_sfile = argv[i]; else
1640         {
1641         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1642         exit(EXIT_FAILURE);
1643         }
1644       }
1645
1646     /* -bf:  Run user filter test
1647        -bfd: Set domain for filter testing
1648        -bfl: Set local part for filter testing
1649        -bfp: Set prefix for filter testing
1650        -bfs: Set suffix for filter testing
1651     */
1652
1653     else if (*argrest == 'f')
1654       {
1655       if (*(++argrest) == 0)
1656         {
1657         filter_test |= FTEST_USER;
1658         if (++i < argc) filter_test_ufile = argv[i]; else
1659           {
1660           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1661           exit(EXIT_FAILURE);
1662           }
1663         }
1664       else
1665         {
1666         if (++i >= argc)
1667           {
1668           fprintf(stderr, "exim: string expected after %s\n", arg);
1669           exit(EXIT_FAILURE);
1670           }
1671         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1672         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1673         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1674         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1675         else { badarg = TRUE; break; }
1676         }
1677       }
1678
1679     /* -bh: Host checking - an IP address must follow. */
1680
1681     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1682       {
1683       if (++i >= argc) { badarg = TRUE; break; }
1684       sender_host_address = argv[i];
1685       host_checking = checking = log_testing_mode = TRUE;
1686       host_checking_callout = argrest[1] == 'c';
1687       }
1688
1689     /* -bi: This option is used by sendmail to initialize *the* alias file,
1690     though it has the -oA option to specify a different file. Exim has no
1691     concept of *the* alias file, but since Sun's YP make script calls
1692     sendmail this way, some support must be provided. */
1693
1694     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1695
1696     /* -bm: Accept and deliver message - the default option. Reinstate
1697     receiving_message, which got turned off for all -b options. */
1698
1699     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1700
1701     /* -bnq: For locally originating messages, do not qualify unqualified
1702     addresses. In the envelope, this causes errors; in header lines they
1703     just get left. */
1704
1705     else if (Ustrcmp(argrest, "nq") == 0)
1706       {
1707       allow_unqualified_sender = FALSE;
1708       allow_unqualified_recipient = FALSE;
1709       }
1710
1711     /* -bpxx: List the contents of the mail queue, in various forms. If
1712     the option is -bpc, just a queue count is needed. Otherwise, if the
1713     first letter after p is r, then order is random. */
1714
1715     else if (*argrest == 'p')
1716       {
1717       if (*(++argrest) == 'c')
1718         {
1719         count_queue = TRUE;
1720         if (*(++argrest) != 0) badarg = TRUE;
1721         break;
1722         }
1723
1724       if (*argrest == 'r')
1725         {
1726         list_queue_option = 8;
1727         argrest++;
1728         }
1729       else list_queue_option = 0;
1730
1731       list_queue = TRUE;
1732
1733       /* -bp: List the contents of the mail queue, top-level only */
1734
1735       if (*argrest == 0) {}
1736
1737       /* -bpu: List the contents of the mail queue, top-level undelivered */
1738
1739       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1740
1741       /* -bpa: List the contents of the mail queue, including all delivered */
1742
1743       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1744
1745       /* Unknown after -bp[r] */
1746
1747       else
1748         {
1749         badarg = TRUE;
1750         break;
1751         }
1752       }
1753
1754
1755     /* -bP: List the configuration variables given as the address list.
1756     Force -v, so configuration errors get displayed. */
1757
1758     else if (Ustrcmp(argrest, "P") == 0)
1759       {
1760       list_options = TRUE;
1761       debug_selector |= D_v;
1762       debug_file = stderr;
1763       }
1764
1765     /* -brt: Test retry configuration lookup */
1766
1767     else if (Ustrcmp(argrest, "rt") == 0)
1768       {
1769       test_retry_arg = i + 1;
1770       goto END_ARG;
1771       }
1772
1773     /* -brw: Test rewrite configuration */
1774
1775     else if (Ustrcmp(argrest, "rw") == 0)
1776       {
1777       test_rewrite_arg = i + 1;
1778       goto END_ARG;
1779       }
1780
1781     /* -bS: Read SMTP commands on standard input, but produce no replies -
1782     all errors are reported by sending messages. */
1783
1784     else if (Ustrcmp(argrest, "S") == 0)
1785       smtp_input = smtp_batched_input = receiving_message = TRUE;
1786
1787     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1788     on standard output. */
1789
1790     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1791
1792     /* -bt: address testing mode */
1793
1794     else if (Ustrcmp(argrest, "t") == 0)
1795       address_test_mode = checking = log_testing_mode = TRUE;
1796
1797     /* -bv: verify addresses */
1798
1799     else if (Ustrcmp(argrest, "v") == 0)
1800       verify_address_mode = checking = log_testing_mode = TRUE;
1801
1802     /* -bvs: verify sender addresses */
1803
1804     else if (Ustrcmp(argrest, "vs") == 0)
1805       {
1806       verify_address_mode = checking = log_testing_mode = TRUE;
1807       verify_as_sender = TRUE;
1808       }
1809
1810     /* -bV: Print version string and support details */
1811
1812     else if (Ustrcmp(argrest, "V") == 0)
1813       {
1814       printf("Exim version %s #%s built %s\n", version_string,
1815         version_cnumber, version_date);
1816       printf("%s\n", CS version_copyright);
1817       version_printed = TRUE;
1818       show_whats_supported(stdout);
1819       }
1820
1821     else badarg = TRUE;
1822     break;
1823
1824
1825     /* -C: change configuration file list; ignore if it isn't really
1826     a change! Enforce a prefix check if required. */
1827
1828     case 'C':
1829     if (*argrest == 0)
1830       {
1831       if(++i < argc) argrest = argv[i]; else
1832         { badarg = TRUE; break; }
1833       }
1834     if (Ustrcmp(config_main_filelist, argrest) != 0)
1835       {
1836       #ifdef ALT_CONFIG_PREFIX
1837       int sep = 0;
1838       int len = Ustrlen(ALT_CONFIG_PREFIX);
1839       uschar *list = argrest;
1840       uschar *filename;
1841       while((filename = string_nextinlist(&list, &sep, big_buffer,
1842              big_buffer_size)) != NULL)
1843         {
1844         if ((Ustrlen(filename) < len ||
1845              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1846              Ustrstr(filename, "/../") != NULL) &&
1847              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1848           {
1849           fprintf(stderr, "-C Permission denied\n");
1850           exit(EXIT_FAILURE);
1851           }
1852         }
1853       #endif
1854
1855       config_main_filelist = argrest;
1856       config_changed = TRUE;
1857       }
1858     break;
1859
1860
1861     /* -D: set up a macro definition */
1862
1863     case 'D':
1864     #ifdef DISABLE_D_OPTION
1865     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1866     exit(EXIT_FAILURE);
1867     #else
1868       {
1869       int ptr = 0;
1870       macro_item *mlast = NULL;
1871       macro_item *m;
1872       uschar name[24];
1873       uschar *s = argrest;
1874
1875       while (isspace(*s)) s++;
1876
1877       if (*s < 'A' || *s > 'Z')
1878         {
1879         fprintf(stderr, "exim: macro name set by -D must start with "
1880           "an upper case letter\n");
1881         exit(EXIT_FAILURE);
1882         }
1883
1884       while (isalnum(*s) || *s == '_')
1885         {
1886         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1887         s++;
1888         }
1889       name[ptr] = 0;
1890       if (ptr == 0) { badarg = TRUE; break; }
1891       while (isspace(*s)) s++;
1892       if (*s != 0)
1893         {
1894         if (*s++ != '=') { badarg = TRUE; break; }
1895         while (isspace(*s)) s++;
1896         }
1897
1898       for (m = macros; m != NULL; m = m->next)
1899         {
1900         if (Ustrcmp(m->name, name) == 0)
1901           {
1902           fprintf(stderr, "exim: duplicated -D in command line\n");
1903           exit(EXIT_FAILURE);
1904           }
1905         mlast = m;
1906         }
1907
1908       m = store_get(sizeof(macro_item) + Ustrlen(name));
1909       m->next = NULL;
1910       m->command_line = TRUE;
1911       if (mlast == NULL) macros = m; else mlast->next = m;
1912       Ustrcpy(m->name, name);
1913       m->replacement = string_copy(s);
1914
1915       if (clmacro_count >= MAX_CLMACROS)
1916         {
1917         fprintf(stderr, "exim: too many -D options on command line\n");
1918         exit(EXIT_FAILURE);
1919         }
1920       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1921         m->replacement);
1922       }
1923     #endif
1924     break;
1925
1926     /* -d: Set debug level (see also -v below) or set the drop_cr option.
1927     The latter is now a no-op, retained for compatibility only. If -dd is used,
1928     debugging subprocesses of the daemon is disabled. */
1929
1930     case 'd':
1931     if (Ustrcmp(argrest, "ropcr") == 0)
1932       {
1933       /* drop_cr = TRUE; */
1934       }
1935
1936     /* Use an intermediate variable so that we don't set debugging while
1937     decoding the debugging bits. */
1938
1939     else
1940       {
1941       unsigned int selector = D_default;
1942       debug_selector = 0;
1943       debug_file = NULL;
1944       if (*argrest == 'd')
1945         {
1946         debug_daemon = TRUE;
1947         argrest++;
1948         }
1949       if (*argrest != 0)
1950         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1951           debug_options_count, US"debug");
1952       debug_selector = selector;
1953       }
1954     break;
1955
1956
1957     /* -E: This is a local error message. This option is not intended for
1958     external use at all, but is not restricted to trusted callers because it
1959     does no harm (just suppresses certain error messages) and if Exim is run
1960     not setuid root it won't always be trusted when it generates error
1961     messages using this option. If there is a message id following -E, point
1962     message_reference at it, for logging. */
1963
1964     case 'E':
1965     local_error_message = TRUE;
1966     if (mac_ismsgid(argrest)) message_reference = argrest;
1967     break;
1968
1969
1970     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1971     option, so it looks as if historically the -oex options are also callable
1972     without the leading -o. So we have to accept them. Before the switch,
1973     anything starting -oe has been converted to -e. Exim does not support all
1974     of the sendmail error options. */
1975
1976     case 'e':
1977     if (Ustrcmp(argrest, "e") == 0)
1978       {
1979       arg_error_handling = ERRORS_SENDER;
1980       errors_sender_rc = EXIT_SUCCESS;
1981       }
1982     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1983     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1984     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1985     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1986     else badarg = TRUE;
1987     break;
1988
1989
1990     /* -F: Set sender's full name, used instead of the gecos entry from
1991     the password file. Since users can usually alter their gecos entries,
1992     there's no security involved in using this instead. The data can follow
1993     the -F or be in the next argument. */
1994
1995     case 'F':
1996     if (*argrest == 0)
1997       {
1998       if(++i < argc) argrest = argv[i]; else
1999         { badarg = TRUE; break; }
2000       }
2001     originator_name = argrest;
2002     sender_name_forced = TRUE;
2003     break;
2004
2005
2006     /* -f: Set sender's address - this value is only actually used if Exim is
2007     run by a trusted user, or if untrusted_set_sender is set and matches the
2008     address, except that the null address can always be set by any user. The
2009     test for this happens later, when the value given here is ignored when not
2010     permitted. For an untrusted user, the actual sender is still put in Sender:
2011     if it doesn't match the From: header (unless no_local_from_check is set).
2012     The data can follow the -f or be in the next argument. The -r switch is an
2013     obsolete form of -f but since there appear to be programs out there that
2014     use anything that sendmail has ever supported, better accept it - the
2015     synonymizing is done before the switch above.
2016
2017     At this stage, we must allow domain literal addresses, because we don't
2018     know what the setting of allow_domain_literals is yet. Ditto for trailing
2019     dots and strip_trailing_dot. */
2020
2021     case 'f':
2022       {
2023       int start, end;
2024       uschar *errmess;
2025       if (*argrest == 0)
2026         {
2027         if (i+1 < argc) argrest = argv[++i]; else
2028           { badarg = TRUE; break; }
2029         }
2030       if (*argrest == 0)
2031         {
2032         sender_address = string_sprintf("");  /* Ensure writeable memory */
2033         }
2034       else
2035         {
2036         uschar *temp = argrest + Ustrlen(argrest) - 1;
2037         while (temp >= argrest && isspace(*temp)) temp--;
2038         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2039         allow_domain_literals = TRUE;
2040         strip_trailing_dot = TRUE;
2041         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2042           &sender_address_domain, TRUE);
2043         allow_domain_literals = FALSE;
2044         strip_trailing_dot = FALSE;
2045         if (sender_address == NULL)
2046           {
2047           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2048           return EXIT_FAILURE;
2049           }
2050         }
2051       sender_address_forced = TRUE;
2052       }
2053     break;
2054
2055     /* This is some Sendmail thing which can be ignored */
2056
2057     case 'G':
2058     break;
2059
2060     /* -h: Set the hop count for an incoming message. Exim does not currently
2061     support this; it always computes it by counting the Received: headers.
2062     To put it in will require a change to the spool header file format. */
2063
2064     case 'h':
2065     if (*argrest == 0)
2066       {
2067       if(++i < argc) argrest = argv[i]; else
2068         { badarg = TRUE; break; }
2069       }
2070     if (!isdigit(*argrest)) badarg = TRUE;
2071     break;
2072
2073
2074     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2075     not to be documented for sendmail but mailx (at least) uses it) */
2076
2077     case 'i':
2078     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2079     break;
2080
2081
2082     case 'M':
2083     receiving_message = FALSE;
2084
2085     /* -MC:  continue delivery of another message via an existing open
2086     file descriptor. This option is used for an internal call by the
2087     smtp transport when there is a pending message waiting to go to an
2088     address to which it has got a connection. Five subsequent arguments are
2089     required: transport name, host name, IP address, sequence number, and
2090     message_id. Transports may decline to create new processes if the sequence
2091     number gets too big. The channel is stdin. This (-MC) must be the last
2092     argument. There's a subsequent check that the real-uid is privileged.
2093
2094     If we are running in the test harness. delay for a bit, to let the process
2095     that set this one up complete. This makes for repeatability of the logging,
2096     etc. output. */
2097
2098     if (Ustrcmp(argrest, "C") == 0)
2099       {
2100       if (argc != i + 6)
2101         {
2102         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2103         return EXIT_FAILURE;
2104         }
2105
2106       if (msg_action_arg >= 0)
2107         {
2108         fprintf(stderr, "exim: incompatible arguments\n");
2109         return EXIT_FAILURE;
2110         }
2111
2112       continue_transport = argv[++i];
2113       continue_hostname = argv[++i];
2114       continue_host_address = argv[++i];
2115       continue_sequence = Uatoi(argv[++i]);
2116       msg_action = MSG_DELIVER;
2117       msg_action_arg = ++i;
2118       forced_delivery = TRUE;
2119       queue_run_pid = passed_qr_pid;
2120       queue_run_pipe = passed_qr_pipe;
2121
2122       if (!mac_ismsgid(argv[i]))
2123         {
2124         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2125           argv[i]);
2126         return EXIT_FAILURE;
2127         }
2128
2129       if (running_in_test_harness) millisleep(500);
2130       break;
2131       }
2132
2133     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2134     precedes -MC (see above). The flag indicates that the host to which
2135     Exim is connected has accepted an AUTH sequence. */
2136
2137     else if (Ustrcmp(argrest, "CA") == 0)
2138       {
2139       smtp_authenticated = TRUE;
2140       break;
2141       }
2142
2143     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2144     it preceded -MC (see above) */
2145
2146     else if (Ustrcmp(argrest, "CP") == 0)
2147       {
2148       smtp_use_pipelining = TRUE;
2149       break;
2150       }
2151
2152     /* -MCQ: pass on the pid of the queue-running process that started
2153     this chain of deliveries and the fd of its synchronizing pipe; this
2154     is useful only when it precedes -MC (see above) */
2155
2156     else if (Ustrcmp(argrest, "CQ") == 0)
2157       {
2158       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2159         else badarg = TRUE;
2160       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2161         else badarg = TRUE;
2162       break;
2163       }
2164
2165     /* -MCS: set the smtp_use_size flag; this is useful only when it
2166     precedes -MC (see above) */
2167
2168     else if (Ustrcmp(argrest, "CS") == 0)
2169       {
2170       smtp_use_size = TRUE;
2171       break;
2172       }
2173
2174     /* -MCT: set the tls_offered flag; this is useful only when it
2175     precedes -MC (see above). The flag indicates that the host to which
2176     Exim is connected has offered TLS support. */
2177
2178     #ifdef SUPPORT_TLS
2179     else if (Ustrcmp(argrest, "CT") == 0)
2180       {
2181       tls_offered = TRUE;
2182       break;
2183       }
2184     #endif
2185
2186     /* -M[x]: various operations on the following list of message ids:
2187        -M    deliver the messages, ignoring next retry times and thawing
2188        -Mc   deliver the messages, checking next retry times, no thawing
2189        -Mf   freeze the messages
2190        -Mg   give up on the messages
2191        -Mt   thaw the messages
2192        -Mrm  remove the messages
2193     In the above cases, this must be the last option. There are also the
2194     following options which are followed by a single message id, and which
2195     act on that message. Some of them use the "recipient" addresses as well.
2196        -Mar  add recipient(s)
2197        -Mmad mark all recipients delivered
2198        -Mmd  mark recipients(s) delivered
2199        -Mes  edit sender
2200        -Mvb  show body
2201        -Mvh  show header
2202        -Mvl  show log
2203     */
2204
2205     else if (*argrest == 0)
2206       {
2207       msg_action = MSG_DELIVER;
2208       forced_delivery = deliver_force_thaw = TRUE;
2209       }
2210     else if (Ustrcmp(argrest, "ar") == 0)
2211       {
2212       msg_action = MSG_ADD_RECIPIENT;
2213       one_msg_action = TRUE;
2214       }
2215     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2216     else if (Ustrcmp(argrest, "es") == 0)
2217       {
2218       msg_action = MSG_EDIT_SENDER;
2219       one_msg_action = TRUE;
2220       }
2221     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2222     else if (Ustrcmp(argrest, "g") == 0)
2223       {
2224       msg_action = MSG_DELIVER;
2225       deliver_give_up = TRUE;
2226       }
2227     else if (Ustrcmp(argrest, "mad") == 0)
2228       {
2229       msg_action = MSG_MARK_ALL_DELIVERED;
2230       }
2231     else if (Ustrcmp(argrest, "md") == 0)
2232       {
2233       msg_action = MSG_MARK_DELIVERED;
2234       one_msg_action = TRUE;
2235       }
2236     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2237     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2238     else if (Ustrcmp(argrest, "vb") == 0)
2239       {
2240       msg_action = MSG_SHOW_BODY;
2241       one_msg_action = TRUE;
2242       }
2243     else if (Ustrcmp(argrest, "vh") == 0)
2244       {
2245       msg_action = MSG_SHOW_HEADER;
2246       one_msg_action = TRUE;
2247       }
2248     else if (Ustrcmp(argrest, "vl") == 0)
2249       {
2250       msg_action = MSG_SHOW_LOG;
2251       one_msg_action = TRUE;
2252       }
2253     else { badarg = TRUE; break; }
2254
2255     /* All the -Mxx options require at least one message id. */
2256
2257     msg_action_arg = i + 1;
2258     if (msg_action_arg >= argc)
2259       {
2260       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2261       return EXIT_FAILURE;
2262       }
2263
2264     /* Some require only message ids to follow */
2265
2266     if (!one_msg_action)
2267       {
2268       int j;
2269       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2270         {
2271         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2272           argv[j], arg);
2273         return EXIT_FAILURE;
2274         }
2275       goto END_ARG;   /* Remaining args are ids */
2276       }
2277
2278     /* Others require only one message id, possibly followed by addresses,
2279     which will be handled as normal arguments. */
2280
2281     else
2282       {
2283       if (!mac_ismsgid(argv[msg_action_arg]))
2284         {
2285         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2286           argv[msg_action_arg], arg);
2287         return EXIT_FAILURE;
2288         }
2289       i++;
2290       }
2291     break;
2292
2293
2294     /* Some programs seem to call the -om option without the leading o;
2295     for sendmail it askes for "me too". Exim always does this. */
2296
2297     case 'm':
2298     if (*argrest != 0) badarg = TRUE;
2299     break;
2300
2301
2302     /* -N: don't do delivery - a debugging option that stops transports doing
2303     their thing. It implies debugging at the D_v level. */
2304
2305     case 'N':
2306     if (*argrest == 0)
2307       {
2308       dont_deliver = TRUE;
2309       debug_selector |= D_v;
2310       debug_file = stderr;
2311       }
2312     else badarg = TRUE;
2313     break;
2314
2315
2316     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2317     it. */
2318
2319     case 'n':
2320     break;
2321
2322     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2323     option to the specified value. This form uses long names. We need to handle
2324     -O option=value and -Ooption=value. */
2325
2326     case 'O':
2327     if (*argrest == 0)
2328       {
2329       if (++i >= argc)
2330         {
2331         fprintf(stderr, "exim: string expected after -O\n");
2332         exit(EXIT_FAILURE);
2333         }
2334       }
2335     break;
2336
2337     case 'o':
2338
2339     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2340     file" option). */
2341
2342     if (*argrest == 'A')
2343       {
2344       alias_arg = argrest + 1;
2345       if (alias_arg[0] == 0)
2346         {
2347         if (i+1 < argc) alias_arg = argv[++i]; else
2348           {
2349           fprintf(stderr, "exim: string expected after -oA\n");
2350           exit(EXIT_FAILURE);
2351           }
2352         }
2353       }
2354
2355     /* -oB: Set a connection message max value for remote deliveries */
2356
2357     else if (*argrest == 'B')
2358       {
2359       uschar *p = argrest + 1;
2360       if (p[0] == 0)
2361         {
2362         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2363           {
2364           connection_max_messages = 1;
2365           p = NULL;
2366           }
2367         }
2368
2369       if (p != NULL)
2370         {
2371         if (!isdigit(*p))
2372           {
2373           fprintf(stderr, "exim: number expected after -oB\n");
2374           exit(EXIT_FAILURE);
2375           }
2376         connection_max_messages = Uatoi(p);
2377         }
2378       }
2379
2380     /* -odb: background delivery */
2381
2382     else if (Ustrcmp(argrest, "db") == 0)
2383       {
2384       synchronous_delivery = FALSE;
2385       arg_queue_only = FALSE;
2386       queue_only_set = TRUE;
2387       }
2388
2389     /* -odf: foreground delivery (smail-compatible option); same effect as
2390        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2391     */
2392
2393     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2394       {
2395       synchronous_delivery = TRUE;
2396       arg_queue_only = FALSE;
2397       queue_only_set = TRUE;
2398       }
2399
2400     /* -odq: queue only */
2401
2402     else if (Ustrcmp(argrest, "dq") == 0)
2403       {
2404       synchronous_delivery = FALSE;
2405       arg_queue_only = TRUE;
2406       queue_only_set = TRUE;
2407       }
2408
2409     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2410     but no remote delivery */
2411
2412     else if (Ustrcmp(argrest, "dqs") == 0)
2413       {
2414       queue_smtp = TRUE;
2415       arg_queue_only = FALSE;
2416       queue_only_set = TRUE;
2417       }
2418
2419     /* -oex: Sendmail error flags. As these are also accepted without the
2420     leading -o prefix, for compatibility with vacation and other callers,
2421     they are handled with -e above. */
2422
2423     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2424        -oitrue: Another sendmail syntax for the same */
2425
2426     else if (Ustrcmp(argrest, "i") == 0 ||
2427              Ustrcmp(argrest, "itrue") == 0)
2428       dot_ends = FALSE;
2429
2430     /* -oM*: Set various characteristics for an incoming message; actually
2431     acted on for trusted callers only. */
2432
2433     else if (*argrest == 'M')
2434       {
2435       if (i+1 >= argc)
2436         {
2437         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2438         exit(EXIT_FAILURE);
2439         }
2440
2441       /* -oMa: Set sender host address */
2442
2443       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2444
2445       /* -oMaa: Set authenticator name */
2446
2447       else if (Ustrcmp(argrest, "Maa") == 0)
2448         sender_host_authenticated = argv[++i];
2449
2450       /* -oMas: setting authenticated sender */
2451
2452       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2453
2454       /* -oMai: setting authenticated id */
2455
2456       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2457
2458       /* -oMi: Set incoming interface address */
2459
2460       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2461
2462       /* -oMr: Received protocol */
2463
2464       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2465
2466       /* -oMs: Set sender host name */
2467
2468       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2469
2470       /* -oMt: Set sender ident */
2471
2472       else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2473
2474       /* Else a bad argument */
2475
2476       else
2477         {
2478         badarg = TRUE;
2479         break;
2480         }
2481       }
2482
2483     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2484     seem to call this as -m (undocumented), so that is also accepted (see
2485     above). */
2486
2487     else if (Ustrcmp(argrest, "m") == 0) {}
2488
2489     /* -oo: An ancient flag for old-style addresses which still seems to
2490     crop up in some calls (see in SCO). */
2491
2492     else if (Ustrcmp(argrest, "o") == 0) {}
2493
2494     /* -oP <name>: set pid file path for daemon */
2495
2496     else if (Ustrcmp(argrest, "P") == 0)
2497       override_pid_file_path = argv[++i];
2498
2499     /* -or <n>: set timeout for non-SMTP acceptance
2500        -os <n>: set timeout for SMTP acceptance */
2501
2502     else if (*argrest == 'r' || *argrest == 's')
2503       {
2504       int *tp = (*argrest == 'r')?
2505         &arg_receive_timeout : &arg_smtp_receive_timeout;
2506       if (argrest[1] == 0)
2507         {
2508         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2509         }
2510       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2511       if (*tp < 0)
2512         {
2513         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2514         exit(EXIT_FAILURE);
2515         }
2516       }
2517
2518     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2519
2520     else if (Ustrcmp(argrest, "X") == 0)
2521       override_local_interfaces = argv[++i];
2522
2523     /* Unknown -o argument */
2524
2525     else badarg = TRUE;
2526     break;
2527
2528
2529     /* -ps: force Perl startup; -pd force delayed Perl startup */
2530
2531     case 'p':
2532     #ifdef EXIM_PERL
2533     if (*argrest == 's' && argrest[1] == 0)
2534       {
2535       perl_start_option = 1;
2536       break;
2537       }
2538     if (*argrest == 'd' && argrest[1] == 0)
2539       {
2540       perl_start_option = -1;
2541       break;
2542       }
2543     #endif
2544
2545     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2546     which sets the host protocol and host name */
2547
2548     if (*argrest == 0)
2549       {
2550       if (i+1 < argc) argrest = argv[++i]; else
2551         { badarg = TRUE; break; }
2552       }
2553
2554     if (*argrest != 0)
2555       {
2556       uschar *hn = Ustrchr(argrest, ':');
2557       if (hn == NULL)
2558         {
2559         received_protocol = argrest;
2560         }
2561       else
2562         {
2563         received_protocol = string_copyn(argrest, hn - argrest);
2564         sender_host_name = hn + 1;
2565         }
2566       }
2567     break;
2568
2569
2570     case 'q':
2571     receiving_message = FALSE;
2572
2573     /* -qq...: Do queue runs in a 2-stage manner */
2574
2575     if (*argrest == 'q')
2576       {
2577       queue_2stage = TRUE;
2578       argrest++;
2579       }
2580
2581     /* -qi...: Do only first (initial) deliveries */
2582
2583     if (*argrest == 'i')
2584       {
2585       queue_run_first_delivery = TRUE;
2586       argrest++;
2587       }
2588
2589     /* -qf...: Run the queue, forcing deliveries
2590        -qff..: Ditto, forcing thawing as well */
2591
2592     if (*argrest == 'f')
2593       {
2594       queue_run_force = TRUE;
2595       if (*(++argrest) == 'f')
2596         {
2597         deliver_force_thaw = TRUE;
2598         argrest++;
2599         }
2600       }
2601
2602     /* -q[f][f]l...: Run the queue only on local deliveries */
2603
2604     if (*argrest == 'l')
2605       {
2606       queue_run_local = TRUE;
2607       argrest++;
2608       }
2609
2610     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2611     optionally starting from a given message id. */
2612
2613     if (*argrest == 0 &&
2614         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2615       {
2616       queue_interval = 0;
2617       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2618         start_queue_run_id = argv[++i];
2619       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2620         stop_queue_run_id = argv[++i];
2621       }
2622
2623     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2624     optionally local only. */
2625
2626     else
2627       {
2628       if (*argrest != 0)
2629         queue_interval = readconf_readtime(argrest, 0, FALSE);
2630       else
2631         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2632       if (queue_interval <= 0)
2633         {
2634         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2635         exit(EXIT_FAILURE);
2636         }
2637       }
2638     break;
2639
2640
2641     case 'R':   /* Synonymous with -qR... */
2642     receiving_message = FALSE;
2643
2644     /* -Rf:   As -R (below) but force all deliveries,
2645        -Rff:  Ditto, but also thaw all frozen messages,
2646        -Rr:   String is regex
2647        -Rrf:  Regex and force
2648        -Rrff: Regex and force and thaw
2649
2650     in all cases provided there are no further characters in this
2651     argument. */
2652
2653     if (*argrest != 0)
2654       {
2655       int i;
2656       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2657         {
2658         if (Ustrcmp(argrest, rsopts[i]) == 0)
2659           {
2660           if (i != 2) queue_run_force = TRUE;
2661           if (i >= 2) deliver_selectstring_regex = TRUE;
2662           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2663           argrest += Ustrlen(rsopts[i]);
2664           }
2665         }
2666       }
2667
2668     /* -R: Set string to match in addresses for forced queue run to
2669     pick out particular messages. */
2670
2671     if (*argrest == 0)
2672       {
2673       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2674         {
2675         fprintf(stderr, "exim: string expected after -R\n");
2676         exit(EXIT_FAILURE);
2677         }
2678       }
2679     else deliver_selectstring = argrest;
2680     if (queue_interval < 0) queue_interval = 0;
2681     break;
2682
2683
2684     /* -r: an obsolete synonym for -f (see above) */
2685
2686
2687     /* -S: Like -R but works on sender. */
2688
2689     case 'S':   /* Synonymous with -qS... */
2690     receiving_message = FALSE;
2691
2692     /* -Sf:   As -S (below) but force all deliveries,
2693        -Sff:  Ditto, but also thaw all frozen messages,
2694        -Sr:   String is regex
2695        -Srf:  Regex and force
2696        -Srff: Regex and force and thaw
2697
2698     in all cases provided there are no further characters in this
2699     argument. */
2700
2701     if (*argrest != 0)
2702       {
2703       int i;
2704       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2705         {
2706         if (Ustrcmp(argrest, rsopts[i]) == 0)
2707           {
2708           if (i != 2) queue_run_force = TRUE;
2709           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2710           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2711           argrest += Ustrlen(rsopts[i]);
2712           }
2713         }
2714       }
2715
2716     /* -S: Set string to match in addresses for forced queue run to
2717     pick out particular messages. */
2718
2719     if (*argrest == 0)
2720       {
2721       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2722         {
2723         fprintf(stderr, "exim: string expected after -S\n");
2724         exit(EXIT_FAILURE);
2725         }
2726       }
2727     else deliver_selectstring_sender = argrest;
2728     if (queue_interval < 0) queue_interval = 0;
2729     break;
2730
2731     /* -Tqt is an option that is exclusively for use by the testing suite.
2732     It is not recognized in other circumstances. It allows for the setting up
2733     of explicit "queue times" so that various warning/retry things can be
2734     tested. Otherwise variability of clock ticks etc. cause problems. */
2735
2736     case 'T':
2737     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2738       fudged_queue_times = argv[++i];
2739     else badarg = TRUE;
2740     break;
2741
2742
2743     /* -t: Set flag to extract recipients from body of message. */
2744
2745     case 't':
2746     if (*argrest == 0) extract_recipients = TRUE;
2747
2748     /* -ti: Set flag to extract recipients from body of message, and also
2749     specify that dot does not end the message. */
2750
2751     else if (Ustrcmp(argrest, "i") == 0)
2752       {
2753       extract_recipients = TRUE;
2754       dot_ends = FALSE;
2755       }
2756
2757     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2758
2759     #ifdef SUPPORT_TLS
2760     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2761     #endif
2762
2763     else badarg = TRUE;
2764     break;
2765
2766
2767     /* -U: This means "initial user submission" in sendmail, apparently. The
2768     doc claims that in future sendmail may refuse syntactically invalid
2769     messages instead of fixing them. For the moment, we just ignore it. */
2770
2771     case 'U':
2772     break;
2773
2774
2775     /* -v: verify things - this is a very low-level debugging */
2776
2777     case 'v':
2778     if (*argrest == 0)
2779       {
2780       debug_selector |= D_v;
2781       debug_file = stderr;
2782       }
2783     else badarg = TRUE;
2784     break;
2785
2786
2787     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2788
2789       The -x flag tells the sendmail command that mail from a local
2790       mail program has National Language Support (NLS) extended characters
2791       in the body of the mail item. The sendmail command can send mail with
2792       extended NLS characters across networks that normally corrupts these
2793       8-bit characters.
2794
2795     As Exim is 8-bit clean, it just ignores this flag. */
2796
2797     case 'x':
2798     if (*argrest != 0) badarg = TRUE;
2799     break;
2800
2801     /* All other initial characters are errors */
2802
2803     default:
2804     badarg = TRUE;
2805     break;
2806     }         /* End of high-level switch statement */
2807
2808   /* Failed to recognize the option, or syntax error */
2809
2810   if (badarg)
2811     {
2812     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2813       "option %s\n", arg);
2814     exit(EXIT_FAILURE);
2815     }
2816   }
2817
2818
2819 /* Arguments have been processed. Check for incompatibilities. */
2820
2821 END_ARG:
2822 if ((
2823     (smtp_input || extract_recipients || recipients_arg < argc) &&
2824     (daemon_listen || queue_interval >= 0 || bi_option ||
2825       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2826       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2827     ) ||
2828     (
2829     msg_action_arg > 0 &&
2830     (daemon_listen || queue_interval >= 0 || list_options || checking ||
2831      bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2832     ) ||
2833     (
2834     (daemon_listen || queue_interval >= 0) &&
2835     (sender_address != NULL || list_options || list_queue || checking ||
2836      bi_option)
2837     ) ||
2838     (
2839     daemon_listen && queue_interval == 0
2840     ) ||
2841     (
2842     list_options &&
2843     (checking || smtp_input || extract_recipients ||
2844       filter_test != FTEST_NONE || bi_option)
2845     ) ||
2846     (
2847     verify_address_mode &&
2848     (address_test_mode || smtp_input || extract_recipients ||
2849       filter_test != FTEST_NONE || bi_option)
2850     ) ||
2851     (
2852     address_test_mode && (smtp_input || extract_recipients ||
2853       filter_test != FTEST_NONE || bi_option)
2854     ) ||
2855     (
2856     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2857       extract_recipients)
2858     ) ||
2859     (
2860     deliver_selectstring != NULL && queue_interval < 0
2861     )
2862    )
2863   {
2864   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2865   exit(EXIT_FAILURE);
2866   }
2867
2868 /* If debugging is set up, set the file and the file descriptor to pass on to
2869 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2870 to run in the foreground. */
2871
2872 if (debug_selector != 0)
2873   {
2874   debug_file = stderr;
2875   debug_fd = fileno(debug_file);
2876   background_daemon = FALSE;
2877   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
2878   if (debug_selector != D_v)    /* -v only doesn't show this */
2879     {
2880     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2881       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2882       debug_selector);
2883     show_whats_supported(stderr);
2884     }
2885   }
2886
2887 /* When started with root privilege, ensure that the limits on the number of
2888 open files and the number of processes (where that is accessible) are
2889 sufficiently large, or are unset, in case Exim has been called from an
2890 environment where the limits are screwed down. Not all OS have the ability to
2891 change some of these limits. */
2892
2893 if (unprivileged)
2894   {
2895   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2896   }
2897 else
2898   {
2899   struct rlimit rlp;
2900
2901   #ifdef RLIMIT_NOFILE
2902   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2903     {
2904     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2905       strerror(errno));
2906     rlp.rlim_cur = rlp.rlim_max = 0;
2907     }
2908
2909   /* I originally chose 1000 as a nice big number that was unlikely to
2910   be exceeded. It turns out that some older OS have a fixed upper limit of
2911   256. */
2912
2913   if (rlp.rlim_cur < 1000)
2914     {
2915     rlp.rlim_cur = rlp.rlim_max = 1000;
2916     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2917       {
2918       rlp.rlim_cur = rlp.rlim_max = 256;
2919       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2920         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2921           strerror(errno));
2922       }
2923     }
2924   #endif
2925
2926   #ifdef RLIMIT_NPROC
2927   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2928     {
2929     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2930       strerror(errno));
2931     rlp.rlim_cur = rlp.rlim_max = 0;
2932     }
2933
2934   #ifdef RLIM_INFINITY
2935   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2936     {
2937     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2938   #else
2939   if (rlp.rlim_cur < 1000)
2940     {
2941     rlp.rlim_cur = rlp.rlim_max = 1000;
2942   #endif
2943     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2944       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2945         strerror(errno));
2946     }
2947   #endif
2948   }
2949
2950 /* Exim is normally entered as root (but some special configurations are
2951 possible that don't do this). However, it always spins off sub-processes that
2952 set their uid and gid as required for local delivery. We don't want to pass on
2953 any extra groups that root may belong to, so we want to get rid of them all at
2954 this point.
2955
2956 We need to obey setgroups() at this stage, before possibly giving up root
2957 privilege for a changed configuration file, but later on we might need to
2958 check on the additional groups for the admin user privilege - can't do that
2959 till after reading the config, which might specify the exim gid. Therefore,
2960 save the group list here first. */
2961
2962 group_count = getgroups(NGROUPS_MAX, group_list);
2963
2964 /* There is a fundamental difference in some BSD systems in the matter of
2965 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2966 known not to be different. On the "different" systems there is a single group
2967 list, and the first entry in it is the current group. On all other versions of
2968 Unix there is a supplementary group list, which is in *addition* to the current
2969 group. Consequently, to get rid of all extraneous groups on a "standard" system
2970 you pass over 0 groups to setgroups(), while on a "different" system you pass
2971 over a single group - the current group, which is always the first group in the
2972 list. Calling setgroups() with zero groups on a "different" system results in
2973 an error return. The following code should cope with both types of system.
2974
2975 However, if this process isn't running as root, setgroups() can't be used
2976 since you have to be root to run it, even if throwing away groups. Not being
2977 root here happens only in some unusual configurations. We just ignore the
2978 error. */
2979
2980 if (setgroups(0, NULL) != 0)
2981   {
2982   if (setgroups(1, group_list) != 0 && !unprivileged)
2983     {
2984     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2985     exit(EXIT_FAILURE);
2986     }
2987   }
2988
2989 /* If the configuration file name has been altered by an argument on the
2990 command line (either a new file name or a macro definition) and the caller is
2991 not root or the exim user, or if this is a filter testing run, remove any
2992 setuid privilege the program has, and run as the underlying user.
2993
2994 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2995 severely restricts the use of -C for some purposes.
2996
2997 Otherwise, set the real ids to the effective values (should be root unless run
2998 from inetd, which it can either be root or the exim uid, if one is configured).
2999
3000 There is a private mechanism for bypassing some of this, in order to make it
3001 possible to test lots of configurations automatically, without having either to
3002 recompile each time, or to patch in an actual configuration file name and other
3003 values (such as the path name). If running in the test harness, pretend that
3004 configuration file changes and macro definitions haven't happened. */
3005
3006 if ((                                            /* EITHER */
3007     (config_changed || macros != NULL) &&        /* Config changed, and */
3008     real_uid != root_uid &&                      /* Not root, and */
3009     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
3010     real_uid != exim_uid &&                      /* Not exim, and */
3011     #endif
3012     !running_in_test_harness                     /* Not fudged */
3013     ) ||                                         /*   OR   */
3014     expansion_test                               /* expansion testing */
3015     ||                                           /*   OR   */
3016     filter_test != FTEST_NONE)                   /* Filter testing */
3017   {
3018   setgroups(group_count, group_list);
3019   exim_setugid(real_uid, real_gid, FALSE,
3020     US"-C, -D, -be or -bf forces real uid");
3021   removed_privilege = TRUE;
3022
3023   /* In the normal case when Exim is called like this, stderr is available
3024   and should be used for any logging information because attempts to write
3025   to the log will usually fail. To arrange this, we unset really_exim. However,
3026   if no stderr is available there is no point - we might as well have a go
3027   at the log (if it fails, syslog will be written). */
3028
3029   if (log_stderr != NULL) really_exim = FALSE;
3030   }
3031
3032 /* Privilege is to be retained for the moment. It may be dropped later,
3033 depending on the job that this Exim process has been asked to do. For now, set
3034 the real uid to the effective so that subsequent re-execs of Exim are done by a
3035 privileged user. */
3036
3037 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3038
3039 /* If testing a filter, open the file(s) now, before wasting time doing other
3040 setups and reading the message. */
3041
3042 if ((filter_test & FTEST_SYSTEM) != 0)
3043   {
3044   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3045   if (filter_sfd < 0)
3046     {
3047     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3048       strerror(errno));
3049     return EXIT_FAILURE;
3050     }
3051   }
3052
3053 if ((filter_test & FTEST_USER) != 0)
3054   {
3055   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3056   if (filter_ufd < 0)
3057     {
3058     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3059       strerror(errno));
3060     return EXIT_FAILURE;
3061     }
3062   }
3063
3064 /* Read the main runtime configuration data; this gives up if there
3065 is a failure. It leaves the configuration file open so that the subsequent
3066 configuration data for delivery can be read if needed. */
3067
3068 readconf_main();
3069
3070 /* Handle the decoding of logging options. */
3071
3072 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3073   log_options, log_options_count, US"log");
3074
3075 DEBUG(D_any)
3076   {
3077   debug_printf("configuration file is %s\n", config_main_filename);
3078   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3079     log_extra_selector);
3080   }
3081
3082 /* If domain literals are not allowed, check the sender address that was
3083 supplied with -f. Ditto for a stripped trailing dot. */
3084
3085 if (sender_address != NULL)
3086   {
3087   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3088     {
3089     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3090       "allowed\n", sender_address);
3091     return EXIT_FAILURE;
3092     }
3093   if (f_end_dot && !strip_trailing_dot)
3094     {
3095     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3096       "(trailing dot not allowed)\n", sender_address);
3097     return EXIT_FAILURE;
3098     }
3099   }
3100
3101 /* Paranoia check of maximum lengths of certain strings. There is a check
3102 on the length of the log file path in log.c, which will come into effect
3103 if there are any calls to write the log earlier than this. However, if we
3104 get this far but the string is very long, it is better to stop now than to
3105 carry on and (e.g.) receive a message and then have to collapse. The call to
3106 log_write() from here will cause the ultimate panic collapse if the complete
3107 file name exceeds the buffer length. */
3108
3109 if (Ustrlen(log_file_path) > 200)
3110   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3111     "log_file_path is longer than 200 chars: aborting");
3112
3113 if (Ustrlen(pid_file_path) > 200)
3114   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3115     "pid_file_path is longer than 200 chars: aborting");
3116
3117 if (Ustrlen(spool_directory) > 200)
3118   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3119     "spool_directory is longer than 200 chars: aborting");
3120
3121 /* Length check on the process name given to syslog for its TAG field,
3122 which is only permitted to be 32 characters or less. See RFC 3164. */
3123
3124 if (Ustrlen(syslog_processname) > 32)
3125   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3126     "syslog_processname is longer than 32 chars: aborting");
3127
3128 /* In some operating systems, the environment variable TMPDIR controls where
3129 temporary files are created; Exim doesn't use these (apart from when delivering
3130 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3131 If TMPDIR is found in the environment, reset it to the value defined in the
3132 TMPDIR macro, if this macro is defined. */
3133
3134 #ifdef TMPDIR
3135   {
3136   uschar **p;
3137   for (p = USS environ; *p != NULL; p++)
3138     {
3139     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3140         Ustrcmp(*p+7, TMPDIR) != 0)
3141       {
3142       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3143       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3144       *p = newp;
3145       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3146       }
3147     }
3148   }
3149 #endif
3150
3151 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3152 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3153 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3154 called by a user who has set the TZ variable. This then affects the timestamps
3155 in log files and in Received: headers, and any created Date: header lines. The
3156 required timezone is settable in the configuration file, so nothing can be done
3157 about this earlier - but hopefully nothing will normally be logged earlier than
3158 this. We have to make a new environment if TZ is wrong, but don't bother if
3159 timestamps_utc is set, because then all times are in UTC anyway. */
3160
3161 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3162   {
3163   timestamps_utc = TRUE;
3164   }
3165 else
3166   {
3167   uschar *envtz = US getenv("TZ");
3168   if ((envtz == NULL && timezone_string != NULL) ||
3169       (envtz != NULL &&
3170         (timezone_string == NULL ||
3171          Ustrcmp(timezone_string, envtz) != 0)))
3172     {
3173     uschar **p = USS environ;
3174     uschar **new;
3175     uschar **newp;
3176     int count = 0;
3177     while (*p++ != NULL) count++;
3178     if (envtz == NULL) count++;
3179     newp = new = malloc(sizeof(uschar *) * (count + 1));
3180     for (p = USS environ; *p != NULL; p++)
3181       {
3182       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3183       *newp++ = *p;
3184       }
3185     if (timezone_string != NULL)
3186       {
3187       *newp = malloc(Ustrlen(timezone_string) + 4);
3188       sprintf(CS *newp++, "TZ=%s", timezone_string);
3189       }
3190     *newp = NULL;
3191     environ = CSS new;
3192     tzset();
3193     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3194       tod_stamp(tod_log));
3195     }
3196   }
3197
3198 /* Handle the case when we have removed the setuid privilege because of -C or
3199 -D. This means that the caller of Exim was not root, and, provided that
3200 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3201 the binary.
3202
3203 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3204 were running as the exim user defined in the configuration file (different to
3205 the one in the binary). The sysadmin may expect this case to retain privilege
3206 because "the binary was called by the Exim user", but it hasn't, because of the
3207 order in which it handles this stuff. There are two possibilities:
3208
3209   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3210       to do message deliveries. Thus, the fact that it is running as a
3211       non-privileged user is plausible, and might be wanted in some special
3212       configurations. However, really_exim will have been set false when
3213       privilege was dropped, to stop Exim trying to write to its normal log
3214       files. Therefore, re-enable normal log processing, assuming the sysadmin
3215       has set up the log directory correctly.
3216
3217   (2) If deliver_drop_privilege is not set, the configuration won't work as
3218       apparently intended, and so we log a panic message. In order to retain
3219       root for -C or -D, the caller must either be root or the Exim user
3220       defined in the binary (when deliver_drop_ privilege is false).
3221
3222 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3223 built-in exim user or one defined in the configuration. In either event,
3224 re-enable log processing, assuming the sysadmin knows what they are doing. */
3225
3226 if (removed_privilege && (config_changed || macros != NULL) &&
3227     real_uid == exim_uid)
3228   {
3229   #ifdef ALT_CONFIG_ROOT_ONLY
3230   really_exim = TRUE;   /* let logging work normally */
3231   #else
3232
3233   if (deliver_drop_privilege)
3234     really_exim = TRUE; /* let logging work normally */
3235   else
3236     log_write(0, LOG_MAIN|LOG_PANIC,
3237       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3238       (int)exim_uid, config_changed? "-C" : "-D");
3239   #endif
3240   }
3241
3242 /* Start up Perl interpreter if Perl support is configured and there is a
3243 perl_startup option, and the configuration or the command line specifies
3244 initializing starting. Note that the global variables are actually called
3245 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3246
3247 #ifdef EXIM_PERL
3248 if (perl_start_option != 0)
3249   opt_perl_at_start = (perl_start_option > 0);
3250 if (opt_perl_at_start && opt_perl_startup != NULL)
3251   {
3252   uschar *errstr;
3253   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3254   errstr = init_perl(opt_perl_startup);
3255   if (errstr != NULL)
3256     {
3257     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3258     return EXIT_FAILURE;
3259     }
3260   opt_perl_started = TRUE;
3261   }
3262 #endif /* EXIM_PERL */
3263
3264 /* Log the arguments of the call if the configuration file said so. This is
3265 a debugging feature for finding out what arguments certain MUAs actually use.
3266 Don't attempt it if logging is disabled, or if listing variables or if
3267 verifying/testing addresses or expansions. */
3268
3269 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3270       && really_exim && !list_options && !checking)
3271   {
3272   int i;
3273   uschar *p = big_buffer;
3274   Ustrcpy(p, "cwd=");
3275   (void)getcwd(CS p+4, big_buffer_size - 4);
3276   while (*p) p++;
3277   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3278   while (*p) p++;
3279   for (i = 0; i < argc; i++)
3280     {
3281     int len = Ustrlen(argv[i]);
3282     uschar *printing;
3283     uschar *quote;
3284     if (p + len + 8 >= big_buffer + big_buffer_size)
3285       {
3286       Ustrcpy(p, " ...");
3287       log_write(0, LOG_MAIN, "%s", big_buffer);
3288       Ustrcpy(big_buffer, "...");
3289       p = big_buffer + 3;
3290       }
3291     printing = string_printing(argv[i]);
3292     if (printing[0] == 0) quote = US"\""; else
3293       {
3294       uschar *pp = printing;
3295       quote = US"";
3296       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3297       }
3298     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3299       (p - big_buffer) - 4), printing, quote);
3300     while (*p) p++;
3301     }
3302
3303   if ((log_extra_selector & LX_arguments) != 0)
3304     log_write(0, LOG_MAIN, "%s", big_buffer);
3305   else
3306     debug_printf("%s\n", big_buffer);
3307   }
3308
3309 /* Set the working directory to be the top-level spool directory. We don't rely
3310 on this in the code, which always uses fully qualified names, but it's useful
3311 for core dumps etc. Don't complain if it fails - the spool directory might not
3312 be generally accessible and calls with the -C option (and others) have lost
3313 privilege by now. Before the chdir, we try to ensure that the directory exists.
3314 */
3315
3316 if (Uchdir(spool_directory) != 0)
3317   {
3318   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3319   (void)Uchdir(spool_directory);
3320   }
3321
3322 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3323 alias file. Exim doesn't have such a concept, but this call is screwed into
3324 Sun's YP makefiles. Handle this by calling a configured script, as the real
3325 user who called Exim. The -oA option can be used to pass an argument to the
3326 script. */
3327
3328 if (bi_option)
3329   {
3330   (void)fclose(config_file);
3331   if (bi_command != NULL)
3332     {
3333     int i = 0;
3334     uschar *argv[3];
3335     argv[i++] = bi_command;
3336     if (alias_arg != NULL) argv[i++] = alias_arg;
3337     argv[i++] = NULL;
3338
3339     setgroups(group_count, group_list);
3340     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3341
3342     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3343       (argv[1] == NULL)? US"" : argv[1]);
3344
3345     execv(CS argv[0], (char *const *)argv);
3346     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3347     exit(EXIT_FAILURE);
3348     }
3349   else
3350     {
3351     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3352     exit(EXIT_SUCCESS);
3353     }
3354   }
3355
3356 /* If an action on specific messages is requested, or if a daemon or queue
3357 runner is being started, we need to know if Exim was called by an admin user.
3358 This is the case if the real user is root or exim, or if the real group is
3359 exim, or if one of the supplementary groups is exim or a group listed in
3360 admin_groups. We don't fail all message actions immediately if not admin_user,
3361 since some actions can be performed by non-admin users. Instead, set admin_user
3362 for later interrogation. */
3363
3364 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3365   admin_user = TRUE;
3366 else
3367   {
3368   int i, j;
3369
3370   for (i = 0; i < group_count; i++)
3371     {
3372     if (group_list[i] == exim_gid) admin_user = TRUE;
3373     else if (admin_groups != NULL)
3374       {
3375       for (j = 1; j <= (int)(admin_groups[0]); j++)
3376         if (admin_groups[j] == group_list[i])
3377           { admin_user = TRUE; break; }
3378       }
3379     if (admin_user) break;
3380     }
3381   }
3382
3383 /* Another group of privileged users are the trusted users. These are root,
3384 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3385 are permitted to specify sender_addresses with -f on the command line, and
3386 other message parameters as well. */
3387
3388 if (real_uid == root_uid || real_uid == exim_uid)
3389   trusted_caller = TRUE;
3390 else
3391   {
3392   int i, j;
3393
3394   if (trusted_users != NULL)
3395     {
3396     for (i = 1; i <= (int)(trusted_users[0]); i++)
3397       if (trusted_users[i] == real_uid)
3398         { trusted_caller = TRUE; break; }
3399     }
3400
3401   if (!trusted_caller && trusted_groups != NULL)
3402     {
3403     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3404       {
3405       if (trusted_groups[i] == real_gid)
3406         trusted_caller = TRUE;
3407       else for (j = 0; j < group_count; j++)
3408         {
3409         if (trusted_groups[i] == group_list[j])
3410           { trusted_caller = TRUE; break; }
3411         }
3412       if (trusted_caller) break;
3413       }
3414     }
3415   }
3416
3417 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3418 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3419
3420 /* Only an admin user may start the daemon or force a queue run in the default
3421 configuration, but the queue run restriction can be relaxed. Only an admin
3422 user may request that a message be returned to its sender forthwith. Only an
3423 admin user may specify a debug level greater than D_v (because it might show
3424 passwords, etc. in lookup queries). Only an admin user may request a queue
3425 count. */
3426
3427 if (!admin_user)
3428   {
3429   BOOL debugset = (debug_selector & ~D_v) != 0;
3430   if (deliver_give_up || daemon_listen ||
3431      (count_queue && queue_list_requires_admin) ||
3432      (list_queue && queue_list_requires_admin) ||
3433      (queue_interval >= 0 && prod_requires_admin) ||
3434      (debugset && !running_in_test_harness))
3435     {
3436     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3437     exit(EXIT_FAILURE);
3438     }
3439   }
3440
3441 /* If the real user is not root or the exim uid, the argument for passing
3442 in an open TCP/IP connection for another message is not permitted, nor is
3443 running with the -N option for any delivery action, unless this call to exim is
3444 one that supplied an input message, or we are using a patched exim for
3445 regression testing. */
3446
3447 if (real_uid != root_uid && real_uid != exim_uid &&
3448      (continue_hostname != NULL ||
3449        (dont_deliver &&
3450          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3451        )) && !running_in_test_harness)
3452   {
3453   fprintf(stderr, "exim: Permission denied\n");
3454   return EXIT_FAILURE;
3455   }
3456
3457 /* If the caller is not trusted, certain arguments are ignored when running for
3458 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3459 Note that authority for performing certain actions on messages is tested in the
3460 queue_action() function. */
3461
3462 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3463   {
3464   sender_host_name = sender_host_address = interface_address =
3465     sender_ident = received_protocol = NULL;
3466   sender_host_port = interface_port = 0;
3467   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3468   }
3469
3470 /* If a sender host address is set, extract the optional port number off the
3471 end of it and check its syntax. Do the same thing for the interface address.
3472 Exim exits if the syntax is bad. */
3473
3474 else
3475   {
3476   if (sender_host_address != NULL)
3477     sender_host_port = check_port(sender_host_address);
3478   if (interface_address != NULL)
3479     interface_port = check_port(interface_address);
3480   }
3481
3482 /* If an SMTP message is being received check to see if the standard input is a
3483 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3484 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3485 barf. */
3486
3487 if (smtp_input)
3488   {
3489   union sockaddr_46 inetd_sock;
3490   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3491   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3492     {
3493     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3494     if (family == AF_INET || family == AF_INET6)
3495       {
3496       union sockaddr_46 interface_sock;
3497       size = sizeof(interface_sock);
3498
3499       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3500         interface_address = host_ntoa(-1, &interface_sock, NULL,
3501           &interface_port);
3502
3503       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3504
3505       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3506         {
3507         is_inetd = TRUE;
3508         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3509           NULL, &sender_host_port);
3510         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3511           "inetd is not supported when mua_wrapper is set");
3512         }
3513       else
3514         {
3515         fprintf(stderr,
3516           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3517         return EXIT_FAILURE;
3518         }
3519       }
3520     }
3521   }
3522
3523 /* If the load average is going to be needed while receiving a message, get it
3524 now for those OS that require the first call to os_getloadavg() to be done as
3525 root. There will be further calls later for each message received. */
3526
3527 #ifdef LOAD_AVG_NEEDS_ROOT
3528 if (receiving_message &&
3529       (queue_only_load >= 0 ||
3530         (is_inetd && smtp_load_reserve >= 0)
3531       ))
3532   {
3533   load_average = os_getloadavg();
3534   }
3535 #endif
3536
3537 /* The queue_only configuration option can be overridden by -odx on the command
3538 line, except that if queue_only_override is false, queue_only cannot be unset
3539 from the command line. */
3540
3541 if (queue_only_set && (queue_only_override || arg_queue_only))
3542   queue_only = arg_queue_only;
3543
3544 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3545 -or and -os. */
3546
3547 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3548 if (arg_smtp_receive_timeout >= 0)
3549   smtp_receive_timeout = arg_smtp_receive_timeout;
3550
3551 /* If Exim was started with root privilege, unless we have already removed the
3552 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3553 except when starting the daemon or doing some kind of delivery or address
3554 testing (-bt). These are the only cases when root need to be retained. We run
3555 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3556 retained only for starting the daemon. */
3557
3558 if (!unprivileged &&                      /* originally had root AND */
3559     !removed_privilege &&                 /* still got root AND      */
3560     !daemon_listen &&                     /* not starting the daemon */
3561     queue_interval <= 0 &&                /* (either kind of daemon) */
3562       (                                   /*    AND EITHER           */
3563       deliver_drop_privilege ||           /* requested unprivileged  */
3564         (                                 /*       OR                */
3565         queue_interval < 0 &&             /* not running the queue   */
3566         (msg_action_arg < 0 ||            /*       and               */
3567           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3568         (!checking || !address_test_mode) /* not address checking    */
3569         )
3570       ))
3571   {
3572   exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3573   }
3574
3575 /* When we are retaining a privileged uid, we still change to the exim gid. */
3576
3577 else setgid(exim_gid);
3578
3579 /* Handle a request to list the delivery queue */
3580
3581 if (list_queue)
3582   {
3583   set_process_info("listing the queue");
3584   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3585   exit(EXIT_SUCCESS);
3586   }
3587
3588 /* Handle a request to count the delivery queue */
3589
3590 if (count_queue)
3591   {
3592   set_process_info("counting the queue");
3593   queue_count();
3594   exit(EXIT_SUCCESS);
3595   }
3596
3597 /* Handle actions on specific messages, except for the force delivery action,
3598 which is done below. Some actions take a whole list of message ids, which
3599 are known to continue up to the end of the arguments. Others take a single
3600 message id and then operate on the recipients list. */
3601
3602 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3603   {
3604   int yield = EXIT_SUCCESS;
3605   set_process_info("acting on specified messages");
3606
3607   if (!one_msg_action)
3608     {
3609     for (i = msg_action_arg; i < argc; i++)
3610       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3611         yield = EXIT_FAILURE;
3612     }
3613
3614   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3615     recipients_arg)) yield = EXIT_FAILURE;
3616   exit(yield);
3617   }
3618
3619 /* All the modes below here require the remaining configuration sections
3620 to be read, except that we can skip over the ACL setting when delivering
3621 specific messages, or doing a queue run. (For various testing cases we could
3622 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3623 for skipping. */
3624
3625 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3626
3627 /* The configuration data will have been read into POOL_PERM because we won't
3628 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3629 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3630 configuration were read into POOL_MAIN, because we don't do any resets till
3631 later on. However, it seems right, and it does ensure that both pools get used.
3632 */
3633
3634 store_pool = POOL_MAIN;
3635
3636 /* Handle the -brt option. This is for checking out retry configurations.
3637 The next three arguments are a domain name or a complete address, and
3638 optionally two error numbers. All it does is to call the function that
3639 scans the retry configuration data. */
3640
3641 if (test_retry_arg >= 0)
3642   {
3643   retry_config *yield;
3644   int basic_errno = 0;
3645   int more_errno = 0;
3646   uschar *s1, *s2;
3647
3648   if (test_retry_arg >= argc)
3649     {
3650     printf("-brt needs a domain or address argument\n");
3651     exim_exit(EXIT_FAILURE);
3652     }
3653   s1 = argv[test_retry_arg++];
3654   s2 = NULL;
3655
3656   /* If the first argument contains no @ and no . it might be a local user
3657   or it might be a single-component name. Treat as a domain. */
3658
3659   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3660     {
3661     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3662       "being \ntreated as a one-component domain, not as a local part.\n\n",
3663       s1);
3664     }
3665
3666   /* There may be an optional second domain arg. */
3667
3668   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3669     s2 = argv[test_retry_arg++];
3670
3671   /* The final arg is an error name */
3672
3673   if (test_retry_arg < argc)
3674     {
3675     uschar *ss = argv[test_retry_arg];
3676     uschar *error =
3677       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3678     if (error != NULL)
3679       {
3680       printf("%s\n", CS error);
3681       return EXIT_FAILURE;
3682       }
3683
3684     /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3685     an error is for matching codes to the decade. Turn them into a real error
3686     code, off the decade. */
3687
3688     if (basic_errno == ERRNO_RCPT4XX)
3689       {
3690       int code = (more_errno >> 8) & 255;
3691       if (code == 255)
3692         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3693       else if (code > 100)
3694         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3695       }
3696     }
3697
3698   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3699   if (yield == NULL) printf("No retry information found\n"); else
3700     {
3701     retry_rule *r;
3702     more_errno = yield->more_errno;
3703     printf("Retry rule: %s  ", yield->pattern);
3704
3705     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3706       {
3707       printf("quota%s%s  ",
3708         (more_errno > 0)? "_" : "",
3709         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3710       }
3711     else if (yield->basic_errno == ECONNREFUSED)
3712       {
3713       printf("refused%s%s  ",
3714         (more_errno > 0)? "_" : "",
3715         (more_errno == 'M')? "MX" :
3716         (more_errno == 'A')? "A" : "");
3717       }
3718     else if (yield->basic_errno == ETIMEDOUT)
3719       {
3720       printf("timeout");
3721       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3722       more_errno &= 255;
3723       if (more_errno != 0) printf("_%s",
3724         (more_errno == 'M')? "MX" : "A");
3725       printf("  ");
3726       }
3727     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3728       printf("auth_failed  ");
3729     else printf("*  ");
3730
3731     for (r = yield->rules; r != NULL; r = r->next)
3732       {
3733       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3734       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3735       if (r->rule == 'G')
3736         {
3737         int x = r->p2;
3738         int f = x % 1000;
3739         int d = 100;
3740         printf(",%d.", x/1000);
3741         do
3742           {
3743           printf("%d", f/d);
3744           f %= d;
3745           d /= 10;
3746           }
3747         while (f != 0);
3748         }
3749       printf("; ");
3750       }
3751
3752     printf("\n");
3753     }
3754   exim_exit(EXIT_SUCCESS);
3755   }
3756
3757 /* Handle a request to list one or more configuration options */
3758
3759 if (list_options)
3760   {
3761   set_process_info("listing variables");
3762   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3763     else for (i = recipients_arg; i < argc; i++)
3764       {
3765       if (i < argc - 1 &&
3766           (Ustrcmp(argv[i], "router") == 0 ||
3767            Ustrcmp(argv[i], "transport") == 0 ||
3768            Ustrcmp(argv[i], "authenticator") == 0))
3769         {
3770         readconf_print(argv[i+1], argv[i]);
3771         i++;
3772         }
3773       else readconf_print(argv[i], NULL);
3774       }
3775   exim_exit(EXIT_SUCCESS);
3776   }
3777
3778
3779 /* Handle a request to deliver one or more messages that are already on the
3780 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3781 is typically used for a small number when prodding by hand (when the option
3782 forced_delivery will be set) or when re-execing to regain root privilege.
3783 Each message delivery must happen in a separate process, so we fork a process
3784 for each one, and run them sequentially so that debugging output doesn't get
3785 intertwined, and to avoid spawning too many processes if a long list is given.
3786 However, don't fork for the last one; this saves a process in the common case
3787 when Exim is called to deliver just one message. */
3788
3789 if (msg_action_arg > 0)
3790   {
3791   if (prod_requires_admin && !admin_user)
3792     {
3793     fprintf(stderr, "exim: Permission denied\n");
3794     exim_exit(EXIT_FAILURE);
3795     }
3796   set_process_info("delivering specified messages");
3797   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3798   for (i = msg_action_arg; i < argc; i++)
3799     {
3800     int status;
3801     pid_t pid;
3802     if (i == argc - 1)
3803       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3804     else if ((pid = fork()) == 0)
3805       {
3806       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3807       _exit(EXIT_SUCCESS);
3808       }
3809     else if (pid < 0)
3810       {
3811       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3812         strerror(errno));
3813       exim_exit(EXIT_FAILURE);
3814       }
3815     else wait(&status);
3816     }
3817   exim_exit(EXIT_SUCCESS);
3818   }
3819
3820
3821 /* If only a single queue run is requested, without SMTP listening, we can just
3822 turn into a queue runner, with an optional starting message id. */
3823
3824 if (queue_interval == 0 && !daemon_listen)
3825   {
3826   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3827     (start_queue_run_id == NULL)? US"" : US" starting at ",
3828     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3829     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
3830     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
3831   set_process_info("running the queue (single queue run)");
3832   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3833   exim_exit(EXIT_SUCCESS);
3834   }
3835
3836
3837 /* Find the login name of the real user running this process. This is always
3838 needed when receiving a message, because it is written into the spool file. It
3839 may also be used to construct a from: or a sender: header, and in this case we
3840 need the user's full name as well, so save a copy of it, checked for RFC822
3841 syntax and munged if necessary, if it hasn't previously been set by the -F
3842 argument. We may try to get the passwd entry more than once, in case NIS or
3843 other delays are in evidence. Save the home directory for use in filter testing
3844 (only). */
3845
3846 for (i = 0;;)
3847   {
3848   if ((pw = getpwuid(real_uid)) != NULL)
3849     {
3850     originator_login = string_copy(US pw->pw_name);
3851     originator_home = string_copy(US pw->pw_dir);
3852
3853     /* If user name has not been set by -F, set it from the passwd entry
3854     unless -f has been used to set the sender address by a trusted user. */
3855
3856     if (originator_name == NULL)
3857       {
3858       if (sender_address == NULL ||
3859            (!trusted_caller && filter_test == FTEST_NONE))
3860         {
3861         uschar *name = US pw->pw_gecos;
3862         uschar *amp = Ustrchr(name, '&');
3863         uschar buffer[256];
3864
3865         /* Most Unix specify that a '&' character in the gecos field is
3866         replaced by a copy of the login name, and some even specify that
3867         the first character should be upper cased, so that's what we do. */
3868
3869         if (amp != NULL)
3870           {
3871           int loffset;
3872           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3873             amp - name, name, &loffset, originator_login, amp + 1);
3874           buffer[loffset] = toupper(buffer[loffset]);
3875           name = buffer;
3876           }
3877
3878         /* If a pattern for matching the gecos field was supplied, apply
3879         it and then expand the name string. */
3880
3881         if (gecos_pattern != NULL && gecos_name != NULL)
3882           {
3883           const pcre *re;
3884           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3885
3886           if (regex_match_and_setup(re, name, 0, -1))
3887             {
3888             uschar *new_name = expand_string(gecos_name);
3889             expand_nmax = -1;
3890             if (new_name != NULL)
3891               {
3892               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3893                 "gecos field \"%s\"\n", new_name, name);
3894               name = new_name;
3895               }
3896             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3897               "\"%s\": %s\n", gecos_name, expand_string_message);
3898             }
3899           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3900             "gecos field \"%s\"\n", gecos_pattern, name);
3901           store_free((void *)re);
3902           }
3903         originator_name = string_copy(name);
3904         }
3905
3906       /* A trusted caller has used -f but not -F */
3907
3908       else originator_name = US"";
3909       }
3910
3911     /* Break the retry loop */
3912
3913     break;
3914     }
3915
3916   if (++i > finduser_retries) break;
3917   sleep(1);
3918   }
3919
3920 /* If we cannot get a user login, log the incident and give up, unless the
3921 configuration specifies something to use. When running in the test harness,
3922 any setting of unknown_login overrides the actual name. */
3923
3924 if (originator_login == NULL || running_in_test_harness)
3925   {
3926   if (unknown_login != NULL)
3927     {
3928     originator_login = expand_string(unknown_login);
3929     if (originator_name == NULL && unknown_username != NULL)
3930       originator_name = expand_string(unknown_username);
3931     if (originator_name == NULL) originator_name = US"";
3932     }
3933   if (originator_login == NULL)
3934     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3935       (int)real_uid);
3936   }
3937
3938 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3939 RFC822 address.*/
3940
3941 originator_name = string_copy(parse_fix_phrase(originator_name,
3942   Ustrlen(originator_name), big_buffer, big_buffer_size));
3943
3944 /* If a message is created by this call of Exim, the uid/gid of its originator
3945 are those of the caller. These values are overridden if an existing message is
3946 read in from the spool. */
3947
3948 originator_uid = real_uid;
3949 originator_gid = real_gid;
3950
3951 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3952   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3953
3954 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3955 returns. We leave this till here so that the originator_ fields are available
3956 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3957 mode. */
3958
3959 if (daemon_listen || queue_interval > 0)
3960   {
3961   if (mua_wrapper)
3962     {
3963     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3964     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3965       "mua_wrapper is set");
3966     }
3967   daemon_go();
3968   }
3969
3970 /* If the sender ident has not been set (by a trusted caller) set it to
3971 the caller. This will get overwritten below for an inetd call. If a trusted
3972 caller has set it empty, unset it. */
3973
3974 if (sender_ident == NULL) sender_ident = originator_login;
3975   else if (sender_ident[0] == 0) sender_ident = NULL;
3976
3977 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3978 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3979 originator_* variables set. */
3980
3981 if (test_rewrite_arg >= 0)
3982   {
3983   really_exim = FALSE;
3984   if (test_rewrite_arg >= argc)
3985     {
3986     printf("-brw needs an address argument\n");
3987     exim_exit(EXIT_FAILURE);
3988     }
3989   rewrite_test(argv[test_rewrite_arg]);
3990   exim_exit(EXIT_SUCCESS);
3991   }
3992
3993 /* A locally-supplied message is considered to be coming from a local user
3994 unless a trusted caller supplies a sender address with -f, or is passing in the
3995 message via SMTP (inetd invocation or otherwise). */
3996
3997 if ((sender_address == NULL && !smtp_input) ||
3998     (!trusted_caller && filter_test == FTEST_NONE))
3999   {
4000   sender_local = TRUE;
4001
4002   /* A trusted caller can supply authenticated_sender and authenticated_id
4003   via -oMas and -oMai and if so, they will already be set. */
4004
4005   if (authenticated_sender == NULL)
4006     authenticated_sender = string_sprintf("%s@%s", originator_login,
4007       qualify_domain_sender);
4008   if (authenticated_id == NULL) authenticated_id = originator_login;
4009   }
4010
4011 /* Trusted callers are always permitted to specify the sender address.
4012 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4013 is specified is the empty address. However, if a trusted caller does not
4014 specify a sender address for SMTP input, we leave sender_address unset. This
4015 causes the MAIL commands to be honoured. */
4016
4017 if ((!smtp_input && sender_address == NULL) ||
4018     !receive_check_set_sender(sender_address))
4019   {
4020   /* Either the caller is not permitted to set a general sender, or this is
4021   non-SMTP input and the trusted caller has not set a sender. If there is no
4022   sender, or if a sender other than <> is set, override with the originator's
4023   login (which will get qualified below), except when checking things. */
4024
4025   if (sender_address == NULL             /* No sender_address set */
4026        ||                                /*         OR            */
4027        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4028        !checking &&                      /* Not running tests, AND */
4029        filter_test == FTEST_NONE))       /* Not testing a filter */
4030     {
4031     sender_address = originator_login;
4032     sender_address_forced = FALSE;
4033     sender_address_domain = 0;
4034     }
4035   }
4036
4037 /* Remember whether an untrusted caller set the sender address */
4038
4039 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4040
4041 /* Ensure that the sender address is fully qualified unless it is the empty
4042 address, which indicates an error message, or doesn't exist (root caller, smtp
4043 interface, no -f argument). */
4044
4045 if (sender_address != NULL && sender_address[0] != 0 &&
4046     sender_address_domain == 0)
4047   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4048     qualify_domain_sender);
4049
4050 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4051
4052 /* Handle a request to verify a list of addresses, or test them for delivery.
4053 This must follow the setting of the sender address, since routers can be
4054 predicated upon the sender. If no arguments are given, read addresses from
4055 stdin. Set debug_level to at least D_v to get full output for address testing.
4056 */
4057
4058 if (verify_address_mode || address_test_mode)
4059   {
4060   int exit_value = 0;
4061   int flags = vopt_qualify;
4062
4063   if (verify_address_mode)
4064     {
4065     if (!verify_as_sender) flags |= vopt_is_recipient;
4066     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4067     }
4068
4069   else
4070     {
4071     flags |= vopt_is_recipient;
4072     debug_selector |= D_v;
4073     debug_file = stderr;
4074     debug_fd = fileno(debug_file);
4075     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4076     }
4077
4078   if (recipients_arg < argc)
4079     {
4080     while (recipients_arg < argc)
4081       {
4082       uschar *s = argv[recipients_arg++];
4083       while (*s != 0)
4084         {
4085         BOOL finished = FALSE;
4086         uschar *ss = parse_find_address_end(s, FALSE);
4087         if (*ss == ',') *ss = 0; else finished = TRUE;
4088         test_address(s, flags, &exit_value);
4089         s = ss;
4090         if (!finished)
4091           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4092         }
4093       }
4094     }
4095
4096   else for (;;)
4097     {
4098     uschar *s = get_stdinput(NULL, NULL);
4099     if (s == NULL) break;
4100     test_address(s, flags, &exit_value);
4101     }
4102
4103   route_tidyup();
4104   exim_exit(exit_value);
4105   }
4106
4107 /* Handle expansion checking */
4108
4109 if (expansion_test)
4110   {
4111   if (recipients_arg < argc)
4112     {
4113     while (recipients_arg < argc)
4114       {
4115       uschar *s = argv[recipients_arg++];
4116       uschar *ss = expand_string(s);
4117       if (ss == NULL)
4118         printf ("Failed: %s\n", expand_string_message);
4119       else printf("%s\n", CS ss);
4120       }
4121     }
4122
4123   /* Read stdin */
4124
4125   else
4126     {
4127     char *(*fn_readline)(char *) = NULL;
4128     char *(*fn_addhist)(char *) = NULL;
4129
4130     #ifdef USE_READLINE
4131     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4132     #endif
4133
4134     for (;;)
4135       {
4136       uschar *ss;
4137       uschar *source = get_stdinput(fn_readline, fn_addhist);
4138       if (source == NULL) break;
4139       ss = expand_string(source);
4140       if (ss == NULL)
4141         printf ("Failed: %s\n", expand_string_message);
4142       else printf("%s\n", CS ss);
4143       }
4144
4145     #ifdef USE_READLINE
4146     if (dlhandle != NULL) dlclose(dlhandle);
4147     #endif
4148     }
4149
4150   exim_exit(EXIT_SUCCESS);
4151   }
4152
4153
4154 /* The active host name is normally the primary host name, but it can be varied
4155 for hosts that want to play several parts at once. We need to ensure that it is
4156 set for host checking, and for receiving messages. */
4157
4158 smtp_active_hostname = primary_hostname;
4159 if (raw_active_hostname != NULL)
4160   {
4161   uschar *nah = expand_string(raw_active_hostname);
4162   if (nah == NULL)
4163     {
4164     if (!expand_string_forcedfail)
4165       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4166         "(smtp_active_hostname): %s", raw_active_hostname,
4167         expand_string_message);
4168     }
4169   else if (nah[0] != 0) smtp_active_hostname = nah;
4170   }
4171
4172 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4173 given IP address so that the blocking and relay configuration can be tested. An
4174 RFC 1413 call is made only if we are running in the test harness and an
4175 incoming interface and both ports are specified, because there is no TCP/IP
4176 call to find the ident for. */
4177
4178 if (host_checking)
4179   {
4180   int x[4];
4181   int size;
4182
4183   sender_ident = NULL;
4184   if (running_in_test_harness && sender_host_port != 0 &&
4185       interface_address != NULL && interface_port != 0)
4186     verify_get_ident(1413);
4187
4188   /* In case the given address is a non-canonical IPv6 address, canonicize
4189   it. The code works for both IPv4 and IPv6, as it happens. */
4190
4191   size = host_aton(sender_host_address, x);
4192   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4193   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4194
4195   /* Now set up for testing */
4196
4197   host_build_sender_fullhost();
4198   smtp_input = TRUE;
4199   smtp_in = stdin;
4200   smtp_out = stdout;
4201   sender_local = FALSE;
4202   sender_host_notsocket = TRUE;
4203   debug_file = stderr;
4204   debug_fd = fileno(debug_file);
4205   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4206     "**** but without any ident (RFC 1413) callback.\n"
4207     "**** This is not for real!\n\n",
4208       sender_host_address);
4209
4210   if (verify_check_host(&hosts_connection_nolog) == OK)
4211     log_write_selector &= ~L_smtp_connection;
4212   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4213
4214   if (smtp_start_session())
4215     {
4216     reset_point = store_get(0);
4217     for (;;)
4218       {
4219       store_reset(reset_point);
4220       if (smtp_setup_msg() <= 0) break;
4221       if (!receive_msg(FALSE)) break;
4222       }
4223     }
4224   exim_exit(EXIT_SUCCESS);
4225   }
4226
4227
4228 /* Arrange for message reception if recipients or SMTP were specified;
4229 otherwise complain unless a version print (-bV) happened or this is a filter
4230 verification test. In the former case, show the configuration file name. */
4231
4232 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4233   {
4234   if (version_printed)
4235     {
4236     printf("Configuration file is %s\n", config_main_filename);
4237     return EXIT_SUCCESS;
4238     }
4239   if (filter_test == FTEST_NONE)
4240     {
4241     fprintf(stderr,
4242 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4243 "not directly from a shell command line. Options and/or arguments control\n"
4244 "what it does when called. For a list of options, see the Exim documentation.\n");
4245     return EXIT_FAILURE;
4246     }
4247   }
4248
4249
4250 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4251 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4252 that we are not called from inetd, because that is rejected above. The
4253 following configuration settings are forced here:
4254
4255   (1) Synchronous delivery (-odi)
4256   (2) Errors to stderr (-oep == -oeq)
4257   (3) No parallel remote delivery
4258   (4) Unprivileged delivery
4259
4260 We don't force overall queueing options because there are several of them;
4261 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4262 to override any SMTP queueing. */
4263
4264 if (mua_wrapper)
4265   {
4266   synchronous_delivery = TRUE;
4267   arg_error_handling = ERRORS_STDERR;
4268   remote_max_parallel = 1;
4269   deliver_drop_privilege = TRUE;
4270   queue_smtp = FALSE;
4271   queue_smtp_domains = NULL;
4272   }
4273
4274
4275 /* Prepare to accept one or more new messages on the standard input. When a
4276 message has been read, its id is returned in message_id[]. If doing immediate
4277 delivery, we fork a delivery process for each received message, except for the
4278 last one, where we can save a process switch.
4279
4280 It is only in non-smtp mode that error_handling is allowed to be changed from
4281 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4282 sendmail error modes other than -oem ever actually used? Later: yes.) */
4283
4284 if (!smtp_input) error_handling = arg_error_handling;
4285
4286 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4287 logging being sent down the socket and make an identd call to get the
4288 sender_ident. */
4289
4290 else if (is_inetd)
4291   {
4292   (void)fclose(stderr);
4293   exim_nullstd();                       /* Re-open to /dev/null */
4294   verify_get_ident(IDENT_PORT);
4295   host_build_sender_fullhost();
4296   set_process_info("handling incoming connection from %s via inetd",
4297     sender_fullhost);
4298   }
4299
4300 /* If the sender host address has been set, build sender_fullhost if it hasn't
4301 already been done (which it will have been for inetd). This caters for the
4302 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4303 so that the test for IP options is skipped for -bs input. */
4304
4305 if (sender_host_address != NULL && sender_fullhost == NULL)
4306   {
4307   host_build_sender_fullhost();
4308   set_process_info("handling incoming connection from %s via -oMa",
4309     sender_fullhost);
4310   sender_host_notsocket = TRUE;
4311   }
4312
4313 /* Otherwise, set the sender host as unknown except for inetd calls. This
4314 prevents host checking in the case of -bs not from inetd and also for -bS. */
4315
4316 else if (!is_inetd) sender_host_unknown = TRUE;
4317
4318 /* If stdout does not exist, then dup stdin to stdout. This can happen
4319 if exim is started from inetd. In this case fd 0 will be set to the socket,
4320 but fd 1 will not be set. This also happens for passed SMTP channels. */
4321
4322 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4323
4324 /* Set up the incoming protocol name and the state of the program. Root
4325 is allowed to force received protocol via the -oMr option above, and if we are
4326 in a non-local SMTP state it means we have come via inetd and the process info
4327 has already been set up. We don't set received_protocol here for smtp input,
4328 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4329
4330 if (smtp_input)
4331   {
4332   if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4333     sender_address);
4334   }
4335 else
4336   {
4337   if (received_protocol == NULL)
4338     received_protocol = string_sprintf("local%s", called_as);
4339   set_process_info("accepting a local non-SMTP message from <%s>",
4340     sender_address);
4341   }
4342
4343 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4344 set) */
4345
4346 queue_check_only();
4347 local_queue_only = queue_only;
4348
4349 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4350 the spool if so configured. On failure, we must not attempt to send an error
4351 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4352 error code is given.) */
4353
4354 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4355   {
4356   fprintf(stderr, "exim: insufficient disk space\n");
4357   return EXIT_FAILURE;
4358   }
4359
4360 /* If this is smtp input of any kind, handle the start of the SMTP
4361 session. */
4362
4363 if (smtp_input)
4364   {
4365   smtp_in = stdin;
4366   smtp_out = stdout;
4367   if (verify_check_host(&hosts_connection_nolog) == OK)
4368     log_write_selector &= ~L_smtp_connection;
4369   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4370   if (!smtp_start_session())
4371     {
4372     mac_smtp_fflush();
4373     exim_exit(EXIT_SUCCESS);
4374     }
4375   }
4376
4377 /* Otherwise, set up the input size limit here */
4378
4379 else
4380   {
4381   thismessage_size_limit = expand_string_integer(message_size_limit);
4382   if (thismessage_size_limit < 0)
4383     {
4384     if (thismessage_size_limit == -1)
4385       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4386         "message_size_limit: %s", expand_string_message);
4387     else
4388       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4389         "message_size_limit: %s", expand_string_message);
4390     }
4391   }
4392
4393 /* Loop for several messages when reading SMTP input. If we fork any child
4394 processes, we don't want to wait for them unless synchronous delivery is
4395 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4396 same as SIG_DFL, despite the fact that documentation often lists the default as
4397 "ignore". This is a confusing area. This is what I know:
4398
4399 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4400 processes that complete simply to go away without ever becoming defunct. You
4401 can't then wait for them - but we don't want to wait for them in the
4402 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4403 happen for all OS (e.g. *BSD is different).
4404
4405 But that's not the end of the story. Some (many? all?) systems have the
4406 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4407 has by default, so it seems that the difference is merely one of default
4408 (compare restarting vs non-restarting signals).
4409
4410 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4411 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4412 of the loop below. Paranoia rules.
4413
4414 February 2003: That's *still* not the end of the story. There are now versions
4415 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4416 process then calls waitpid(), a grumble is written to the system log, because
4417 this is logically inconsistent. In other words, it doesn't like the paranoia.
4418 As a consequenc of this, the waitpid() below is now excluded if we are sure
4419 that SIG_IGN works. */
4420
4421 if (!synchronous_delivery)
4422   {
4423   #ifdef SA_NOCLDWAIT
4424   struct sigaction act;
4425   act.sa_handler = SIG_IGN;
4426   sigemptyset(&(act.sa_mask));
4427   act.sa_flags = SA_NOCLDWAIT;
4428   sigaction(SIGCHLD, &act, NULL);
4429   #else
4430   signal(SIGCHLD, SIG_IGN);
4431   #endif
4432   }
4433
4434 /* Save the current store pool point, for resetting at the start of
4435 each message, and save the real sender address, if any. */
4436
4437 reset_point = store_get(0);
4438 real_sender_address = sender_address;
4439
4440 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4441 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4442 collapsed). */
4443
4444 while (more)
4445   {
4446   store_reset(reset_point);
4447   message_id[0] = 0;
4448
4449   /* In the SMTP case, we have to handle the initial SMTP input and build the
4450   recipients list, before calling receive_msg() to read the message proper.
4451   Whatever sender address is actually given in the SMTP transaction is
4452   actually ignored for local senders - we use the actual sender, which is
4453   normally either the underlying user running this process or a -f argument
4454   provided by a trusted caller. It is saved in real_sender_address.
4455
4456   However, if this value is NULL, we are dealing with a trusted caller when
4457   -f was not used; in this case, the SMTP sender is allowed to stand.
4458
4459   Also, if untrusted_set_sender is set, we permit sender addresses that match
4460   anything in its list.
4461
4462   The variable raw_sender_address holds the sender address before rewriting. */
4463
4464   if (smtp_input)
4465     {
4466     int rc;
4467     if ((rc = smtp_setup_msg()) > 0)
4468       {
4469       if (real_sender_address != NULL &&
4470           !receive_check_set_sender(sender_address))
4471         {
4472         sender_address = raw_sender = real_sender_address;
4473         sender_address_unrewritten = NULL;
4474         }
4475       more = receive_msg(extract_recipients);
4476       if (message_id[0] == 0)
4477         {
4478         if (more) continue;
4479         exim_exit(EXIT_FAILURE);
4480         }
4481       }
4482     else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4483     }
4484
4485   /* In the non-SMTP case, we have all the information from the command
4486   line, but must process it in case it is in the more general RFC822
4487   format, and in any case, to detect syntax errors. Also, it appears that
4488   the use of comma-separated lists as single arguments is common, so we
4489   had better support them. */
4490
4491   else
4492     {
4493     int i;
4494     int rcount = 0;
4495     int count = argc - recipients_arg;
4496     uschar **list = argv + recipients_arg;
4497
4498     /* These options cannot be changed dynamically for non-SMTP messages */
4499
4500     active_local_sender_retain = local_sender_retain;
4501     active_local_from_check = local_from_check;
4502
4503     /* Save before any rewriting */
4504
4505     raw_sender = string_copy(sender_address);
4506
4507     /* Loop for each argument */
4508
4509     for (i = 0; i < count; i++)
4510       {
4511       int start, end, domain;
4512       uschar *errmess;
4513       uschar *s = list[i];
4514
4515       /* Loop for each comma-separated address */
4516
4517       while (*s != 0)
4518         {
4519         BOOL finished = FALSE;
4520         uschar *recipient;
4521         uschar *ss = parse_find_address_end(s, FALSE);
4522
4523         if (*ss == ',') *ss = 0; else finished = TRUE;
4524
4525         /* Check max recipients - if -t was used, these aren't recipients */
4526
4527         if (recipients_max > 0 && ++rcount > recipients_max &&
4528             !extract_recipients)
4529           {
4530           if (error_handling == ERRORS_STDERR)
4531             {
4532             fprintf(stderr, "exim: too many recipients\n");
4533             exim_exit(EXIT_FAILURE);
4534             }
4535           else
4536             {
4537             return
4538               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4539                 errors_sender_rc : EXIT_FAILURE;
4540             }
4541           }
4542
4543         recipient =
4544           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4545
4546         if (domain == 0 && !allow_unqualified_recipient)
4547           {
4548           recipient = NULL;
4549           errmess = US"unqualified recipient address not allowed";
4550           }
4551
4552         if (recipient == NULL)
4553           {
4554           if (error_handling == ERRORS_STDERR)
4555             {
4556             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4557               string_printing(list[i]), errmess);
4558             exim_exit(EXIT_FAILURE);
4559             }
4560           else
4561             {
4562             error_block eblock;
4563             eblock.next = NULL;
4564             eblock.text1 = string_printing(list[i]);
4565             eblock.text2 = errmess;
4566             return
4567               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4568                 errors_sender_rc : EXIT_FAILURE;
4569             }
4570           }
4571
4572         receive_add_recipient(recipient, -1);
4573         s = ss;
4574         if (!finished)
4575           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4576         }
4577       }
4578
4579     /* Show the recipients when debugging */
4580
4581     DEBUG(D_receive)
4582       {
4583       int i;
4584       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4585       if (recipients_list != NULL)
4586         {
4587         debug_printf("Recipients:\n");
4588         for (i = 0; i < recipients_count; i++)
4589           debug_printf("  %s\n", recipients_list[i].address);
4590         }
4591       }
4592
4593     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4594     will just read the headers for the message, and not write anything onto the
4595     spool. */
4596
4597     message_ended = END_NOTENDED;
4598     more = receive_msg(extract_recipients);
4599
4600     /* more is always FALSE here (not SMTP message) when reading a message
4601     for real; when reading the headers of a message for filter testing,
4602     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4603
4604     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4605     }  /* Non-SMTP message reception */
4606
4607   /* If this is a filter testing run, there are headers in store, but
4608   no message on the spool. Run the filtering code in testing mode, setting
4609   the domain to the qualify domain and the local part to the current user,
4610   unless they have been set by options. The prefix and suffix are left unset
4611   unless specified. The the return path is set to to the sender unless it has
4612   already been set from a return-path header in the message. */
4613
4614   if (filter_test != FTEST_NONE)
4615     {
4616     deliver_domain = (ftest_domain != NULL)?
4617       ftest_domain : qualify_domain_recipient;
4618     deliver_domain_orig = deliver_domain;
4619     deliver_localpart = (ftest_localpart != NULL)?
4620       ftest_localpart : originator_login;
4621     deliver_localpart_orig = deliver_localpart;
4622     deliver_localpart_prefix = ftest_prefix;
4623     deliver_localpart_suffix = ftest_suffix;
4624     deliver_home = originator_home;
4625
4626     if (return_path == NULL)
4627       {
4628       printf("Return-path copied from sender\n");
4629       return_path = string_copy(sender_address);
4630       }
4631     else
4632       {
4633       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4634       }
4635     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4636
4637     receive_add_recipient(
4638       string_sprintf("%s%s%s@%s",
4639         (ftest_prefix == NULL)? US"" : ftest_prefix,
4640         deliver_localpart,
4641         (ftest_suffix == NULL)? US"" : ftest_suffix,
4642         deliver_domain), -1);
4643
4644     printf("Recipient   = %s\n", recipients_list[0].address);
4645     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4646     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4647
4648     (void)chdir("/");   /* Get away from wherever the user is running this from */
4649
4650     /* Now we run either a system filter test, or a user filter test, or both.
4651     In the latter case, headers added by the system filter will persist and be
4652     available to the user filter. We need to copy the filter variables
4653     explicitly. */
4654
4655     if ((filter_test & FTEST_SYSTEM) != 0)
4656       {
4657       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4658         exim_exit(EXIT_FAILURE);
4659       }
4660
4661     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4662
4663     if ((filter_test & FTEST_USER) != 0)
4664       {
4665       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4666         exim_exit(EXIT_FAILURE);
4667       }
4668
4669     exim_exit(EXIT_SUCCESS);
4670     }
4671
4672   /* Else act on the result of message reception. We should not get here unless
4673   message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4674   TRUE. If it is not, check on the number of messages received in this
4675   connection. If that's OK and queue_only_load is set, check that the load
4676   average is below it. If it is not, set local_queue_only TRUE. Note that it
4677   then remains this way for any subsequent messages on the same SMTP connection.
4678   This is a deliberate choice; even though the load average may fall, it
4679   doesn't seem right to deliver later messages on the same call when not
4680   delivering earlier ones. */
4681
4682   if (!local_queue_only)
4683     {
4684     if (smtp_accept_queue_per_connection > 0 &&
4685         receive_messagecount > smtp_accept_queue_per_connection)
4686       {
4687       local_queue_only = TRUE;
4688       queue_only_reason = 2;
4689       }
4690     else if (queue_only_load >= 0)
4691       {
4692       local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4693       if (local_queue_only) queue_only_reason = 3;
4694       }
4695     }
4696
4697   /* If running as an MUA wrapper, all queueing options and freezing options
4698   are ignored. */
4699
4700   if (mua_wrapper)
4701     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4702
4703   /* Log the queueing here, when it will get a message id attached, but
4704   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4705   connections). */
4706
4707   if (local_queue_only) switch(queue_only_reason)
4708     {
4709     case 2:
4710     log_write(L_delay_delivery,
4711               LOG_MAIN, "no immediate delivery: more than %d messages "
4712       "received in one connection", smtp_accept_queue_per_connection);
4713     break;
4714
4715     case 3:
4716     log_write(L_delay_delivery,
4717               LOG_MAIN, "no immediate delivery: load average %.2f",
4718               (double)load_average/1000.0);
4719     break;
4720     }
4721
4722   /* Else do the delivery unless the ACL or local_scan() called for queue only
4723   or froze the message. Always deliver in a separate process. A fork failure is
4724   not a disaster, as the delivery will eventually happen on a subsequent queue
4725   run. The search cache must be tidied before the fork, as the parent will
4726   do it before exiting. The child will trigger a lookup failure and
4727   thereby defer the delivery if it tries to use (for example) a cached ldap
4728   connection that the parent has called unbind on. */
4729
4730   else if (!queue_only_policy && !deliver_freeze)
4731     {
4732     pid_t pid;
4733     search_tidyup();
4734
4735     if ((pid = fork()) == 0)
4736       {
4737       int rc;
4738       close_unwanted();      /* Close unwanted file descriptors and TLS */
4739       exim_nullstd();        /* Ensure std{in,out,err} exist */
4740
4741       /* Occasionally in the test harness we don't have synchronous delivery
4742       set (can happen with bounces). In that case, let the old process finish
4743       before continuing, to keep the debug output the same. */
4744
4745       if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4746
4747       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4748       mode, deliver_drop_privilege is forced TRUE). */
4749
4750       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4751         {
4752         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4753           message_id);
4754         /* Control does not return here. */
4755         }
4756
4757       /* No need to re-exec */
4758
4759       rc = deliver_message(message_id, FALSE, FALSE);
4760       search_tidyup();
4761       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4762         EXIT_SUCCESS : EXIT_FAILURE);
4763       }
4764
4765     if (pid < 0)
4766       {
4767       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4768         "process: %s", strerror(errno));
4769       }
4770
4771     /* In the parent, wait if synchronous delivery is required. This will
4772     always be the case in MUA wrapper mode. */
4773
4774     else if (synchronous_delivery)
4775       {
4776       int status;
4777       while (wait(&status) != pid);
4778       if ((status & 0x00ff) != 0)
4779         log_write(0, LOG_MAIN|LOG_PANIC,
4780           "process %d crashed with signal %d while delivering %s",
4781           (int)pid, status & 0x00ff, message_id);
4782       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4783       }
4784     }
4785
4786   /* The loop will repeat if more is TRUE. If we do not know know that the OS
4787   automatically reaps children (see comments above the loop), clear away any
4788   finished subprocesses here, in case there are lots of messages coming in
4789   from the same source. */
4790
4791   #ifndef SIG_IGN_WORKS
4792   while (waitpid(-1, NULL, WNOHANG) > 0);
4793   #endif
4794   }
4795
4796 exim_exit(EXIT_SUCCESS);   /* Never returns */
4797 return 0;                  /* To stop compiler warning */
4798 }
4799
4800 /* End of exim.c */