src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.71 2010/06/07 00:12:42 pdp Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2009 */
   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 extern void init_lookup_list(void);
  18
  19
  20
  21 /*************************************************
  22 *      Function interface to store functions     *
  23 *************************************************/
  24
  25 /* We need some real functions to pass to the PCRE regular expression library
  26 for store allocation via Exim's store manager. The normal calls are actually
  27 macros that pass over location information to make tracing easier. These
  28 functions just interface to the standard macro calls. A good compiler will
  29 optimize out the tail recursion and so not make them too expensive. There
  30 are two sets of functions; one for use when we want to retain the compiled
  31 regular expression for a long time; the other for short-term use. */
  32
  33 static void *
  34 function_store_get(size_t size)
  35 {
  36 return store_get((int)size);
  37 }
  38
  39 static void
  40 function_dummy_free(void *block) { block = block; }
  41
  42 static void *
  43 function_store_malloc(size_t size)
  44 {
  45 return store_malloc((int)size);
  46 }
  47
  48 static void
  49 function_store_free(void *block)
  50 {
  51 store_free(block);
  52 }
  53
  54
  55
  56
  57 /*************************************************
  58 *  Compile regular expression and panic on fail  *
  59 *************************************************/
  60
  61 /* This function is called when failure to compile a regular expression leads
  62 to a panic exit. In other cases, pcre_compile() is called directly. In many
  63 cases where this function is used, the results of the compilation are to be
  64 placed in long-lived store, so we temporarily reset the store management
  65 functions that PCRE uses if the use_malloc flag is set.
  66
  67 Argument:
  68   pattern     the pattern to compile
  69   caseless    TRUE if caseless matching is required
  70   use_malloc  TRUE if compile into malloc store
  71
  72 Returns:      pointer to the compiled pattern
  73 */
  74
  75 const pcre *
  76 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
  77 {
  78 int offset;
  79 int options = PCRE_COPT;
  80 const pcre *yield;
  81 const uschar *error;
  82 if (use_malloc)
  83   {
  84   pcre_malloc = function_store_malloc;
  85   pcre_free = function_store_free;
  86   }
  87 if (caseless) options |= PCRE_CASELESS;
  88 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
  89 pcre_malloc = function_store_get;
  90 pcre_free = function_dummy_free;
  91 if (yield == NULL)
  92   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
  93     "%s at offset %d while compiling %s", error, offset, pattern);
  94 return yield;
  95 }
  96
  97
  98
  99
 100 /*************************************************
 101 *   Execute regular expression and set strings   *
 102 *************************************************/
 103
 104 /* This function runs a regular expression match, and sets up the pointers to
 105 the matched substrings.
 106
 107 Arguments:
 108   re          the compiled expression
 109   subject     the subject string
 110   options     additional PCRE options
 111   setup       if < 0 do full setup
 112               if >= 0 setup from setup+1 onwards,
 113                 excluding the full matched string
 114
 115 Returns:      TRUE or FALSE
 116 */
 117
 118 BOOL
 119 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
 120 {
 121 int ovector[3*(EXPAND_MAXN+1)];
 122 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
 123   PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
 124 BOOL yield = n >= 0;
 125 if (n == 0) n = EXPAND_MAXN + 1;
 126 if (yield)
 127   {
 128   int nn;
 129   expand_nmax = (setup < 0)? 0 : setup + 1;
 130   for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
 131     {
 132     expand_nstring[expand_nmax] = subject + ovector[nn];
 133     expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
 134     }
 135   expand_nmax--;
 136   }
 137 return yield;
 138 }
 139
 140
 141
 142
 143 /*************************************************
 144 *             Handler for SIGUSR1                *
 145 *************************************************/
 146
 147 /* SIGUSR1 causes any exim process to write to the process log details of
 148 what it is currently doing. It will only be used if the OS is capable of
 149 setting up a handler that causes automatic restarting of any system call
 150 that is in progress at the time.
 151
 152 Argument: the signal number (SIGUSR1)
 153 Returns:  nothing
 154 */
 155
 156 static void
 157 usr1_handler(int sig)
 158 {
 159 sig = sig;      /* Keep picky compilers happy */
 160 log_write(0, LOG_PROCESS, "%s", process_info);
 161 log_close_all();
 162 os_restarting_signal(SIGUSR1, usr1_handler);
 163 }
 164
 165
 166
 167 /*************************************************
 168 *             Timeout handler                    *
 169 *************************************************/
 170
 171 /* This handler is enabled most of the time that Exim is running. The handler
 172 doesn't actually get used unless alarm() has been called to set a timer, to
 173 place a time limit on a system call of some kind. When the handler is run, it
 174 re-enables itself.
 175
 176 There are some other SIGALRM handlers that are used in special cases when more
 177 than just a flag setting is required; for example, when reading a message's
 178 input. These are normally set up in the code module that uses them, and the
 179 SIGALRM handler is reset to this one afterwards.
 180
 181 Argument: the signal value (SIGALRM)
 182 Returns:  nothing
 183 */
 184
 185 void
 186 sigalrm_handler(int sig)
 187 {
 188 sig = sig;      /* Keep picky compilers happy */
 189 sigalrm_seen = TRUE;
 190 os_non_restarting_signal(SIGALRM, sigalrm_handler);
 191 }
 192
 193
 194
 195 /*************************************************
 196 *      Sleep for a fractional time interval      *
 197 *************************************************/
 198
 199 /* This function is called by millisleep() and exim_wait_tick() to wait for a
 200 period of time that may include a fraction of a second. The coding is somewhat
 201 tedious. We do not expect setitimer() ever to fail, but if it does, the process
 202 will wait for ever, so we panic in this instance. (There was a case of this
 203 when a bug in a function that calls milliwait() caused it to pass invalid data.
 204 That's when I added the check. :-)
 205
 206 Argument:  an itimerval structure containing the interval
 207 Returns:   nothing
 208 */
 209
 210 static void
 211 milliwait(struct itimerval *itval)
 212 {
 213 sigset_t sigmask;
 214 sigset_t old_sigmask;
 215 (void)sigemptyset(&sigmask);                           /* Empty mask */
 216 (void)sigaddset(&sigmask, SIGALRM);                    /* Add SIGALRM */
 217 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask);  /* Block SIGALRM */
 218 if (setitimer(ITIMER_REAL, itval, NULL) < 0)           /* Start timer */
 219   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
 220     "setitimer() failed: %s", strerror(errno));
 221 (void)sigfillset(&sigmask);                            /* All signals */
 222 (void)sigdelset(&sigmask, SIGALRM);                    /* Remove SIGALRM */
 223 (void)sigsuspend(&sigmask);                            /* Until SIGALRM */
 224 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL);    /* Restore mask */
 225 }
 226
 227
 228
 229
 230 /*************************************************
 231 *         Millisecond sleep function             *
 232 *************************************************/
 233
 234 /* The basic sleep() function has a granularity of 1 second, which is too rough
 235 in some cases - for example, when using an increasing delay to slow down
 236 spammers.
 237
 238 Argument:    number of millseconds
 239 Returns:     nothing
 240 */
 241
 242 void
 243 millisleep(int msec)
 244 {
 245 struct itimerval itval;
 246 itval.it_interval.tv_sec = 0;
 247 itval.it_interval.tv_usec = 0;
 248 itval.it_value.tv_sec = msec/1000;
 249 itval.it_value.tv_usec = (msec % 1000) * 1000;
 250 milliwait(&itval);
 251 }
 252
 253
 254
 255 /*************************************************
 256 *         Compare microsecond times              *
 257 *************************************************/
 258
 259 /*
 260 Arguments:
 261   tv1         the first time
 262   tv2         the second time
 263
 264 Returns:      -1, 0, or +1
 265 */
 266
 267 int
 268 exim_tvcmp(struct timeval *t1, struct timeval *t2)
 269 {
 270 if (t1->tv_sec > t2->tv_sec) return +1;
 271 if (t1->tv_sec < t2->tv_sec) return -1;
 272 if (t1->tv_usec > t2->tv_usec) return +1;
 273 if (t1->tv_usec < t2->tv_usec) return -1;
 274 return 0;
 275 }
 276
 277
 278
 279
 280 /*************************************************
 281 *          Clock tick wait function              *
 282 *************************************************/
 283
 284 /* Exim uses a time + a pid to generate a unique identifier in two places: its
 285 message IDs, and in file names for maildir deliveries. Because some OS now
 286 re-use pids within the same second, sub-second times are now being used.
 287 However, for absolute certaintly, we must ensure the clock has ticked before
 288 allowing the relevant process to complete. At the time of implementation of
 289 this code (February 2003), the speed of processors is such that the clock will
 290 invariably have ticked already by the time a process has done its job. This
 291 function prepares for the time when things are faster - and it also copes with
 292 clocks that go backwards.
 293
 294 Arguments:
 295   then_tv      A timeval which was used to create uniqueness; its usec field
 296                  has been rounded down to the value of the resolution.
 297                  We want to be sure the current time is greater than this.
 298   resolution   The resolution that was used to divide the microseconds
 299                  (1 for maildir, larger for message ids)
 300
 301 Returns:       nothing
 302 */
 303
 304 void
 305 exim_wait_tick(struct timeval *then_tv, int resolution)
 306 {
 307 struct timeval now_tv;
 308 long int now_true_usec;
 309
 310 (void)gettimeofday(&now_tv, NULL);
 311 now_true_usec = now_tv.tv_usec;
 312 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
 313
 314 if (exim_tvcmp(&now_tv, then_tv) <= 0)
 315   {
 316   struct itimerval itval;
 317   itval.it_interval.tv_sec = 0;
 318   itval.it_interval.tv_usec = 0;
 319   itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
 320   itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
 321
 322   /* We know that, overall, "now" is less than or equal to "then". Therefore, a
 323   negative value for the microseconds is possible only in the case when "now"
 324   is more than a second less than "then". That means that itval.it_value.tv_sec
 325   is greater than zero. The following correction is therefore safe. */
 326
 327   if (itval.it_value.tv_usec < 0)
 328     {
 329     itval.it_value.tv_usec += 1000000;
 330     itval.it_value.tv_sec -= 1;
 331     }
 332
 333   DEBUG(D_transport|D_receive)
 334     {
 335     if (!running_in_test_harness)
 336       {
 337       debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
 338         then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
 339       debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
 340         itval.it_value.tv_usec);
 341       }
 342     }
 343
 344   milliwait(&itval);
 345   }
 346 }
 347
 348
 349
 350
 351 /*************************************************
 352 *            Set up processing details           *
 353 *************************************************/
 354
 355 /* Save a text string for dumping when SIGUSR1 is received.
 356 Do checks for overruns.
 357
 358 Arguments: format and arguments, as for printf()
 359 Returns:   nothing
 360 */
 361
 362 void
 363 set_process_info(char *format, ...)
 364 {
 365 int len;
 366 va_list ap;
 367 sprintf(CS process_info, "%5d ", (int)getpid());
 368 len = Ustrlen(process_info);
 369 va_start(ap, format);
 370 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
 371   Ustrcpy(process_info + len, "**** string overflowed buffer ****");
 372 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
 373 va_end(ap);
 374 }
 375
 376
 377
 378
 379
 380 /*************************************************
 381 *   Call fopen() with umask 777 and adjust mode  *
 382 *************************************************/
 383
 384 /* Exim runs with umask(0) so that files created with open() have the mode that
 385 is specified in the open() call. However, there are some files, typically in
 386 the spool directory, that are created with fopen(). They end up world-writeable
 387 if no precautions are taken. Although the spool directory is not accessible to
 388 the world, this is an untidiness. So this is a wrapper function for fopen()
 389 that sorts out the mode of the created file.
 390
 391 Arguments:
 392    filename       the file name
 393    options        the fopen() options
 394    mode           the required mode
 395
 396 Returns:          the fopened FILE or NULL
 397 */
 398
 399 FILE *
 400 modefopen(uschar *filename, char *options, mode_t mode)
 401 {
 402 mode_t saved_umask = umask(0777);
 403 FILE *f = Ufopen(filename, options);
 404 (void)umask(saved_umask);
 405 if (f != NULL) (void)fchmod(fileno(f), mode);
 406 return f;
 407 }
 408
 409
 410
 411
 412 /*************************************************
 413 *   Ensure stdin, stdout, and stderr exist       *
 414 *************************************************/
 415
 416 /* Some operating systems grumble if an exec() happens without a standard
 417 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 418 file will be opened and will use these fd values, and then some other bit of
 419 code will assume, for example, that it can write error messages to stderr.
 420 This function ensures that fds 0, 1, and 2 are open if they do not already
 421 exist, by connecting them to /dev/null.
 422
 423 This function is also used to ensure that std{in,out,err} exist at all times,
 424 so that if any library that Exim calls tries to use them, it doesn't crash.
 425
 426 Arguments:  None
 427 Returns:    Nothing
 428 */
 429
 430 void
 431 exim_nullstd(void)
 432 {
 433 int i;
 434 int devnull = -1;
 435 struct stat statbuf;
 436 for (i = 0; i <= 2; i++)
 437   {
 438   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 439     {
 440     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 441     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 442       string_open_failed(errno, "/dev/null"));
 443     if (devnull != i) (void)dup2(devnull, i);
 444     }
 445   }
 446 if (devnull > 2) (void)close(devnull);
 447 }
 448
 449
 450
 451
 452 /*************************************************
 453 *   Close unwanted file descriptors for delivery *
 454 *************************************************/
 455
 456 /* This function is called from a new process that has been forked to deliver
 457 an incoming message, either directly, or using exec.
 458
 459 We want any smtp input streams to be closed in this new process. However, it
 460 has been observed that using fclose() here causes trouble. When reading in -bS
 461 input, duplicate copies of messages have been seen. The files will be sharing a
 462 file pointer with the parent process, and it seems that fclose() (at least on
 463 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
 464 least sometimes. Hence we go for closing the underlying file descriptors.
 465
 466 If TLS is active, we want to shut down the TLS library, but without molesting
 467 the parent's SSL connection.
 468
 469 For delivery of a non-SMTP message, we want to close stdin and stdout (and
 470 stderr unless debugging) because the calling process might have set them up as
 471 pipes and be waiting for them to close before it waits for the submission
 472 process to terminate. If they aren't closed, they hold up the calling process
 473 until the initial delivery process finishes, which is not what we want.
 474
 475 Exception: We do want it for synchronous delivery!
 476
 477 And notwithstanding all the above, if D_resolver is set, implying resolver
 478 debugging, leave stdout open, because that's where the resolver writes its
 479 debugging output.
 480
 481 When we close stderr (which implies we've also closed stdout), we also get rid
 482 of any controlling terminal.
 483
 484 Arguments:   None
 485 Returns:     Nothing
 486 */
 487
 488 static void
 489 close_unwanted(void)
 490 {
 491 if (smtp_input)
 492   {
 493   #ifdef SUPPORT_TLS
 494   tls_close(FALSE);      /* Shut down the TLS library */
 495   #endif
 496   (void)close(fileno(smtp_in));
 497   (void)close(fileno(smtp_out));
 498   smtp_in = NULL;
 499   }
 500 else
 501   {
 502   (void)close(0);                                          /* stdin */
 503   if ((debug_selector & D_resolver) == 0) (void)close(1);  /* stdout */
 504   if (debug_selector == 0)                                 /* stderr */
 505     {
 506     if (!synchronous_delivery)
 507       {
 508       (void)close(2);
 509       log_stderr = NULL;
 510       }
 511     (void)setsid();
 512     }
 513   }
 514 }
 515
 516
 517
 518
 519 /*************************************************
 520 *          Set uid and gid                       *
 521 *************************************************/
 522
 523 /* This function sets a new uid and gid permanently, optionally calling
 524 initgroups() to set auxiliary groups. There are some special cases when running
 525 Exim in unprivileged modes. In these situations the effective uid will not be
 526 root; if we already have the right effective uid/gid, and don't need to
 527 initialize any groups, leave things as they are.
 528
 529 Arguments:
 530   uid        the uid
 531   gid        the gid
 532   igflag     TRUE if initgroups() wanted
 533   msg        text to use in debugging output and failure log
 534
 535 Returns:     nothing; bombs out on failure
 536 */
 537
 538 void
 539 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
 540 {
 541 uid_t euid = geteuid();
 542 gid_t egid = getegid();
 543
 544 if (euid == root_uid || euid != uid || egid != gid || igflag)
 545   {
 546   /* At least one OS returns +1 for initgroups failure, so just check for
 547   non-zero. */
 548
 549   if (igflag)
 550     {
 551     struct passwd *pw = getpwuid(uid);
 552     if (pw != NULL)
 553       {
 554       if (initgroups(pw->pw_name, gid) != 0)
 555         log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
 556           (long int)uid, strerror(errno));
 557       }
 558     else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
 559       "no passwd entry for uid=%ld", (long int)uid);
 560     }
 561
 562   if (setgid(gid) < 0 || setuid(uid) < 0)
 563     {
 564     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
 565       "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
 566     }
 567   }
 568
 569 /* Debugging output included uid/gid and all groups */
 570
 571 DEBUG(D_uid)
 572   {
 573   int group_count;
 574   gid_t group_list[NGROUPS_MAX];
 575   debug_printf("changed uid/gid: %s\n  uid=%ld gid=%ld pid=%ld\n", msg,
 576     (long int)geteuid(), (long int)getegid(), (long int)getpid());
 577   group_count = getgroups(NGROUPS_MAX, group_list);
 578   debug_printf("  auxiliary group list:");
 579   if (group_count > 0)
 580     {
 581     int i;
 582     for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
 583     }
 584   else debug_printf(" <none>");
 585   debug_printf("\n");
 586   }
 587 }
 588
 589
 590
 591
 592 /*************************************************
 593 *               Exit point                       *
 594 *************************************************/
 595
 596 /* Exim exits via this function so that it always clears up any open
 597 databases.
 598
 599 Arguments:
 600   rc         return code
 601
 602 Returns:     does not return
 603 */
 604
 605 void
 606 exim_exit(int rc)
 607 {
 608 search_tidyup();
 609 DEBUG(D_any)
 610   debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
 611     ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
 612 exit(rc);
 613 }
 614
 615
 616
 617
 618 /*************************************************
 619 *         Extract port from host address         *
 620 *************************************************/
 621
 622 /* Called to extract the port from the values given to -oMa and -oMi.
 623 It also checks the syntax of the address, and terminates it before the
 624 port data when a port is extracted.
 625
 626 Argument:
 627   address   the address, with possible port on the end
 628
 629 Returns:    the port, or zero if there isn't one
 630             bombs out on a syntax error
 631 */
 632
 633 static int
 634 check_port(uschar *address)
 635 {
 636 int port = host_address_extract_port(address);
 637 if (string_is_ip_address(address, NULL) == 0)
 638   {
 639   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 640   exit(EXIT_FAILURE);
 641   }
 642 return port;
 643 }
 644
 645
 646
 647 /*************************************************
 648 *              Test/verify an address            *
 649 *************************************************/
 650
 651 /* This function is called by the -bv and -bt code. It extracts a working
 652 address from a full RFC 822 address. This isn't really necessary per se, but it
 653 has the effect of collapsing source routes.
 654
 655 Arguments:
 656   s            the address string
 657   flags        flag bits for verify_address()
 658   exit_value   to be set for failures
 659
 660 Returns:       nothing
 661 */
 662
 663 static void
 664 test_address(uschar *s, int flags, int *exit_value)
 665 {
 666 int start, end, domain;
 667 uschar *parse_error = NULL;
 668 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 669   FALSE);
 670 if (address == NULL)
 671   {
 672   fprintf(stdout, "syntax error: %s\n", parse_error);
 673   *exit_value = 2;
 674   }
 675 else
 676   {
 677   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 678     -1, -1, NULL, NULL, NULL);
 679   if (rc == FAIL) *exit_value = 2;
 680     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 681   }
 682 }
 683
 684
 685
 686 /*************************************************
 687 *          Show supported features               *
 688 *************************************************/
 689
 690 /* This function is called for -bV/--version and for -d to output the optional
 691 features of the current Exim binary.
 692
 693 Arguments:  a FILE for printing
 694 Returns:    nothing
 695 */
 696
 697 static void
 698 show_whats_supported(FILE *f)
 699 {
 700 #ifdef DB_VERSION_STRING
 701 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 702 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 703   #ifdef USE_DB
 704   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 705   #else
 706   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 707   #endif
 708 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 709 fprintf(f, "Probably ndbm\n");
 710 #elif defined(USE_TDB)
 711 fprintf(f, "Using tdb\n");
 712 #else
 713   #ifdef USE_GDBM
 714   fprintf(f, "Probably GDBM (native mode)\n");
 715   #else
 716   fprintf(f, "Probably GDBM (compatibility mode)\n");
 717   #endif
 718 #endif
 719
 720 fprintf(f, "Support for:");
 721 #ifdef SUPPORT_CRYPTEQ
 722   fprintf(f, " crypteq");
 723 #endif
 724 #if HAVE_ICONV
 725   fprintf(f, " iconv()");
 726 #endif
 727 #if HAVE_IPV6
 728   fprintf(f, " IPv6");
 729 #endif
 730 #ifdef HAVE_SETCLASSRESOURCES
 731   fprintf(f, " use_setclassresources");
 732 #endif
 733 #ifdef SUPPORT_PAM
 734   fprintf(f, " PAM");
 735 #endif
 736 #ifdef EXIM_PERL
 737   fprintf(f, " Perl");
 738 #endif
 739 #ifdef EXPAND_DLFUNC
 740   fprintf(f, " Expand_dlfunc");
 741 #endif
 742 #ifdef USE_TCP_WRAPPERS
 743   fprintf(f, " TCPwrappers");
 744 #endif
 745 #ifdef SUPPORT_TLS
 746   #ifdef USE_GNUTLS
 747   fprintf(f, " GnuTLS");
 748   #else
 749   fprintf(f, " OpenSSL");
 750   #endif
 751 #endif
 752 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
 753   fprintf(f, " translate_ip_address");
 754 #endif
 755 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 756   fprintf(f, " move_frozen_messages");
 757 #endif
 758 #ifdef WITH_CONTENT_SCAN
 759   fprintf(f, " Content_Scanning");
 760 #endif
 761 #ifndef DISABLE_DKIM
 762   fprintf(f, " DKIM");
 763 #endif
 764 #ifdef WITH_OLD_DEMIME
 765   fprintf(f, " Old_Demime");
 766 #endif
 767 #ifdef EXPERIMENTAL_SPF
 768   fprintf(f, " Experimental_SPF");
 769 #endif
 770 #ifdef EXPERIMENTAL_SRS
 771   fprintf(f, " Experimental_SRS");
 772 #endif
 773 #ifdef EXPERIMENTAL_BRIGHTMAIL
 774   fprintf(f, " Experimental_Brightmail");
 775 #endif
 776 #ifdef EXPERIMENTAL_DCC
 777   fprintf(f, " Experimental_DCC");
 778 #endif
 779 fprintf(f, "\n");
 780
 781 fprintf(f, "Lookups (built-in):");
 782 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
 783   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 784 #endif
 785 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
 786   fprintf(f, " cdb");
 787 #endif
 788 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
 789   fprintf(f, " dbm dbmnz");
 790 #endif
 791 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
 792   fprintf(f, " dnsdb");
 793 #endif
 794 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
 795   fprintf(f, " dsearch");
 796 #endif
 797 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
 798   fprintf(f, " ibase");
 799 #endif
 800 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
 801   fprintf(f, " ldap ldapdn ldapm");
 802 #endif
 803 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
 804   fprintf(f, " mysql");
 805 #endif
 806 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
 807   fprintf(f, " nis nis0");
 808 #endif
 809 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
 810   fprintf(f, " nisplus");
 811 #endif
 812 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
 813   fprintf(f, " oracle");
 814 #endif
 815 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
 816   fprintf(f, " passwd");
 817 #endif
 818 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
 819   fprintf(f, " pgsql");
 820 #endif
 821 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
 822   fprintf(f, " sqlite");
 823 #endif
 824 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
 825   fprintf(f, " testdb");
 826 #endif
 827 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
 828   fprintf(f, " whoson");
 829 #endif
 830 fprintf(f, "\n");
 831
 832 fprintf(f, "Authenticators:");
 833 #ifdef AUTH_CRAM_MD5
 834   fprintf(f, " cram_md5");
 835 #endif
 836 #ifdef AUTH_CYRUS_SASL
 837   fprintf(f, " cyrus_sasl");
 838 #endif
 839 #ifdef AUTH_DOVECOT
 840   fprintf(f, " dovecot");
 841 #endif
 842 #ifdef AUTH_PLAINTEXT
 843   fprintf(f, " plaintext");
 844 #endif
 845 #ifdef AUTH_SPA
 846   fprintf(f, " spa");
 847 #endif
 848 fprintf(f, "\n");
 849
 850 fprintf(f, "Routers:");
 851 #ifdef ROUTER_ACCEPT
 852   fprintf(f, " accept");
 853 #endif
 854 #ifdef ROUTER_DNSLOOKUP
 855   fprintf(f, " dnslookup");
 856 #endif
 857 #ifdef ROUTER_IPLITERAL
 858   fprintf(f, " ipliteral");
 859 #endif
 860 #ifdef ROUTER_IPLOOKUP
 861   fprintf(f, " iplookup");
 862 #endif
 863 #ifdef ROUTER_MANUALROUTE
 864   fprintf(f, " manualroute");
 865 #endif
 866 #ifdef ROUTER_QUERYPROGRAM
 867   fprintf(f, " queryprogram");
 868 #endif
 869 #ifdef ROUTER_REDIRECT
 870   fprintf(f, " redirect");
 871 #endif
 872 fprintf(f, "\n");
 873
 874 fprintf(f, "Transports:");
 875 #ifdef TRANSPORT_APPENDFILE
 876   fprintf(f, " appendfile");
 877   #ifdef SUPPORT_MAILDIR
 878     fprintf(f, "/maildir");
 879   #endif
 880   #ifdef SUPPORT_MAILSTORE
 881     fprintf(f, "/mailstore");
 882   #endif
 883   #ifdef SUPPORT_MBX
 884     fprintf(f, "/mbx");
 885   #endif
 886 #endif
 887 #ifdef TRANSPORT_AUTOREPLY
 888   fprintf(f, " autoreply");
 889 #endif
 890 #ifdef TRANSPORT_LMTP
 891   fprintf(f, " lmtp");
 892 #endif
 893 #ifdef TRANSPORT_PIPE
 894   fprintf(f, " pipe");
 895 #endif
 896 #ifdef TRANSPORT_SMTP
 897   fprintf(f, " smtp");
 898 #endif
 899 fprintf(f, "\n");
 900
 901 if (fixed_never_users[0] > 0)
 902   {
 903   int i;
 904   fprintf(f, "Fixed never_users: ");
 905   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
 906     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
 907   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
 908   }
 909
 910 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
 911
 912 /* This runtime check is to help diagnose library linkage mismatches which
 913 result in segfaults and the like; as such, it's left until the end,
 914 just in case.  There will still be a "Configuration file is" line still to
 915 come. */
 916 #ifdef SUPPORT_TLS
 917 tls_version_report(f);
 918 #endif
 919
 920 /* Everything else is details which are only worth reporting when debugging.
 921 Perhaps the tls_version_report should move into this too. */
 922 DEBUG(D_any) do {
 923
 924   int i;
 925
 926 #ifdef AUTH_CYRUS_SASL
 927   auth_cyrus_sasl_version_report(f);
 928 #endif
 929
 930   fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
 931              "                       Runtime: %s\n",
 932           PCRE_MAJOR, PCRE_MINOR,
 933           /* PRE_PRERELEASE is either defined and empty or a string.
 934            * This should work: */
 935           PCRE_PRERELEASE "",
 936           pcre_version());
 937
 938   init_lookup_list();
 939   for (i = 0; i < lookup_list_count; i++)
 940     {
 941     if (lookup_list[i]->version_report)
 942       lookup_list[i]->version_report(f);
 943     }
 944
 945 } while (0);
 946 }
 947
 948
 949
 950
 951 /*************************************************
 952 *               Quote a local part               *
 953 *************************************************/
 954
 955 /* This function is used when a sender address or a From: or Sender: header
 956 line is being created from the caller's login, or from an authenticated_id. It
 957 applies appropriate quoting rules for a local part.
 958
 959 Argument:    the local part
 960 Returns:     the local part, quoted if necessary
 961 */
 962
 963 uschar *
 964 local_part_quote(uschar *lpart)
 965 {
 966 BOOL needs_quote = FALSE;
 967 int size, ptr;
 968 uschar *yield;
 969 uschar *t;
 970
 971 for (t = lpart; !needs_quote && *t != 0; t++)
 972   {
 973   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
 974     (*t != '.' || t == lpart || t[1] == 0);
 975   }
 976
 977 if (!needs_quote) return lpart;
 978
 979 size = ptr = 0;
 980 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
 981
 982 for (;;)
 983   {
 984   uschar *nq = US Ustrpbrk(lpart, "\\\"");
 985   if (nq == NULL)
 986     {
 987     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
 988     break;
 989     }
 990   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
 991   yield = string_cat(yield, &size, &ptr, US"\\", 1);
 992   yield = string_cat(yield, &size, &ptr, nq, 1);
 993   lpart = nq + 1;
 994   }
 995
 996 yield = string_cat(yield, &size, &ptr, US"\"", 1);
 997 yield[ptr] = 0;
 998 return yield;
 999 }
1000
1001
1002
1003 #ifdef USE_READLINE
1004 /*************************************************
1005 *         Load readline() functions              *
1006 *************************************************/
1007
1008 /* This function is called from testing executions that read data from stdin,
1009 but only when running as the calling user. Currently, only -be does this. The
1010 function loads the readline() function library and passes back the functions.
1011 On some systems, it needs the curses library, so load that too, but try without
1012 it if loading fails. All this functionality has to be requested at build time.
1013
1014 Arguments:
1015   fn_readline_ptr   pointer to where to put the readline pointer
1016   fn_addhist_ptr    pointer to where to put the addhistory function
1017
1018 Returns:            the dlopen handle or NULL on failure
1019 */
1020
1021 static void *
1022 set_readline(char * (**fn_readline_ptr)(char *),
1023              char * (**fn_addhist_ptr)(char *))
1024 {
1025 void *dlhandle;
1026 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1027
1028 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1029 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1030
1031 if (dlhandle != NULL)
1032   {
1033   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1034   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1035   }
1036 else
1037   {
1038   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1039   }
1040
1041 return dlhandle;
1042 }
1043 #endif
1044
1045
1046
1047 /*************************************************
1048 *    Get a line from stdin for testing things    *
1049 *************************************************/
1050
1051 /* This function is called when running tests that can take a number of lines
1052 of input (for example, -be and -bt). It handles continuations and trailing
1053 spaces. And prompting and a blank line output on eof. If readline() is in use,
1054 the arguments are non-NULL and provide the relevant functions.
1055
1056 Arguments:
1057   fn_readline   readline function or NULL
1058   fn_addhist    addhist function or NULL
1059
1060 Returns:        pointer to dynamic memory, or NULL at end of file
1061 */
1062
1063 static uschar *
1064 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1065 {
1066 int i;
1067 int size = 0;
1068 int ptr = 0;
1069 uschar *yield = NULL;
1070
1071 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1072
1073 for (i = 0;; i++)
1074   {
1075   uschar buffer[1024];
1076   uschar *p, *ss;
1077
1078   #ifdef USE_READLINE
1079   char *readline_line = NULL;
1080   if (fn_readline != NULL)
1081     {
1082     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1083     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1084     p = US readline_line;
1085     }
1086   else
1087   #endif
1088
1089   /* readline() not in use */
1090
1091     {
1092     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1093     p = buffer;
1094     }
1095
1096   /* Handle the line */
1097
1098   ss = p + (int)Ustrlen(p);
1099   while (ss > p && isspace(ss[-1])) ss--;
1100
1101   if (i > 0)
1102     {
1103     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1104     }
1105
1106   yield = string_cat(yield, &size, &ptr, p, ss - p);
1107
1108   #ifdef USE_READLINE
1109   if (fn_readline != NULL) free(readline_line);
1110   #endif
1111
1112   if (ss == p || yield[ptr-1] != '\\')
1113     {
1114     yield[ptr] = 0;
1115     break;
1116     }
1117   yield[--ptr] = 0;
1118   }
1119
1120 if (yield == NULL) printf("\n");
1121 return yield;
1122 }
1123
1124
1125
1126 /*************************************************
1127 *    Output usage information for the program    *
1128 *************************************************/
1129
1130 /* This function is called when there are no recipients
1131    or a specific --help argument was added.
1132
1133 Arguments:
1134   progname      information on what name we were called by
1135
1136 Returns:        DOES NOT RETURN
1137 */
1138
1139 static void
1140 exim_usage(uschar *progname)
1141 {
1142
1143 /* Handle specific program invocation varients */
1144 if (Ustrcmp(progname, US"-mailq") == 0)
1145   {
1146   fprintf(stderr,
1147     "mailq - list the contents of the mail queue\n\n"
1148     "For a list of options, see the Exim documentation.\n");
1149   exit(EXIT_FAILURE);
1150   }
1151
1152 /* Generic usage - we output this whatever happens */
1153 fprintf(stderr,
1154   "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1155   "not directly from a shell command line. Options and/or arguments control\n"
1156   "what it does when called. For a list of options, see the Exim documentation.\n");
1157
1158 exit(EXIT_FAILURE);
1159 }
1160
1161
1162
1163 /*************************************************
1164 *    Validate that the macros given are okay     *
1165 *************************************************/
1166
1167 /* Typically, Exim will drop privileges if macros are supplied.  In some
1168 cases, we want to not do so.
1169
1170 Arguments:    none (macros is a global)
1171 Returns:      true if trusted, false otherwise
1172 */
1173
1174 static BOOL
1175 macros_trusted(void)
1176 {
1177 #ifdef WHITELIST_D_MACROS
1178 macro_item *m;
1179 uschar *whitelisted, *end, *p, **whites, **w;
1180 int white_count, i, n;
1181 size_t len;
1182 BOOL prev_char_item, found;
1183 #endif
1184
1185 if (macros == NULL)
1186   return TRUE;
1187 #ifndef WHITELIST_D_MACROS
1188 return FALSE;
1189 #else
1190
1191 /* We only trust -D overrides for some invoking users:
1192 root, the exim run-time user, the optional config owner user.
1193 I don't know why config-owner would be needed, but since they can own the
1194 config files anyway, there's no security risk to letting them override -D. */
1195 if ( ! ((real_uid == root_uid)
1196      || (real_uid == exim_uid)
1197 #ifdef CONFIGURE_OWNER
1198      || (real_uid == config_uid)
1199 #endif
1200    ))
1201   {
1202   debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1203   return FALSE;
1204   }
1205
1206 /* Get a list of macros which are whitelisted */
1207 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1208 prev_char_item = FALSE;
1209 white_count = 0;
1210 for (p = whitelisted; *p != '\0'; ++p)
1211   {
1212   if (*p == ':' || isspace(*p))
1213     {
1214     *p = '\0';
1215     if (prev_char_item)
1216       ++white_count;
1217     prev_char_item = FALSE;
1218     continue;
1219     }
1220   if (!prev_char_item)
1221     prev_char_item = TRUE;
1222   }
1223 end = p;
1224 if (prev_char_item)
1225   ++white_count;
1226 if (!white_count)
1227   return FALSE;
1228 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1229 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1230   {
1231   if (*p != '\0')
1232     {
1233     whites[i++] = p;
1234     if (i == white_count)
1235       break;
1236     while (*p != '\0' && p < end)
1237       ++p;
1238     }
1239   }
1240 whites[i] = NULL;
1241
1242 /* The list of macros should be very short.  Accept the N*M complexity. */
1243 for (m = macros; m != NULL; m = m->next)
1244   {
1245   found = FALSE;
1246   for (w = whites; *w; ++w)
1247     if (Ustrcmp(*w, m->name) == 0)
1248       {
1249       found = TRUE;
1250       break;
1251       }
1252   if (!found)
1253     return FALSE;
1254   if (m->replacement == NULL)
1255     continue;
1256   len = Ustrlen(m->replacement);
1257   if (len == 0)
1258     continue;
1259   n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1260    0, PCRE_EOPT, NULL, 0);
1261   if (n < 0)
1262     {
1263     if (n != PCRE_ERROR_NOMATCH)
1264       debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1265     return FALSE;
1266     }
1267   }
1268 debug_printf("macros_trusted overriden to true by whitelisting\n");
1269 return TRUE;
1270 #endif
1271 }
1272
1273
1274 /*************************************************
1275 *          Entry point and high-level code       *
1276 *************************************************/
1277
1278 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1279 the appropriate action. All the necessary functions are present in the one
1280 binary. I originally thought one should split it up, but it turns out that so
1281 much of the apparatus is needed in each chunk that one might as well just have
1282 it all available all the time, which then makes the coding easier as well.
1283
1284 Arguments:
1285   argc      count of entries in argv
1286   argv      argument strings, with argv[0] being the program name
1287
1288 Returns:    EXIT_SUCCESS if terminated successfully
1289             EXIT_FAILURE otherwise, except when a message has been sent
1290               to the sender, and -oee was given
1291 */
1292
1293 int
1294 main(int argc, char **cargv)
1295 {
1296 uschar **argv = USS cargv;
1297 int  arg_receive_timeout = -1;
1298 int  arg_smtp_receive_timeout = -1;
1299 int  arg_error_handling = error_handling;
1300 int  filter_sfd = -1;
1301 int  filter_ufd = -1;
1302 int  group_count;
1303 int  i;
1304 int  list_queue_option = 0;
1305 int  msg_action = 0;
1306 int  msg_action_arg = -1;
1307 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1308 int  queue_only_reason = 0;
1309 #ifdef EXIM_PERL
1310 int  perl_start_option = 0;
1311 #endif
1312 int  recipients_arg = argc;
1313 int  sender_address_domain = 0;
1314 int  test_retry_arg = -1;
1315 int  test_rewrite_arg = -1;
1316 BOOL arg_queue_only = FALSE;
1317 BOOL bi_option = FALSE;
1318 BOOL checking = FALSE;
1319 BOOL count_queue = FALSE;
1320 BOOL expansion_test = FALSE;
1321 BOOL extract_recipients = FALSE;
1322 BOOL forced_delivery = FALSE;
1323 BOOL f_end_dot = FALSE;
1324 BOOL deliver_give_up = FALSE;
1325 BOOL list_queue = FALSE;
1326 BOOL list_options = FALSE;
1327 BOOL local_queue_only;
1328 BOOL more = TRUE;
1329 BOOL one_msg_action = FALSE;
1330 BOOL queue_only_set = FALSE;
1331 BOOL receiving_message = TRUE;
1332 BOOL sender_ident_set = FALSE;
1333 BOOL session_local_queue_only;
1334 BOOL unprivileged;
1335 BOOL removed_privilege = FALSE;
1336 BOOL usage_wanted = FALSE;
1337 BOOL verify_address_mode = FALSE;
1338 BOOL verify_as_sender = FALSE;
1339 BOOL version_printed = FALSE;
1340 uschar *alias_arg = NULL;
1341 uschar *called_as = US"";
1342 uschar *start_queue_run_id = NULL;
1343 uschar *stop_queue_run_id = NULL;
1344 uschar *expansion_test_message = NULL;
1345 uschar *ftest_domain = NULL;
1346 uschar *ftest_localpart = NULL;
1347 uschar *ftest_prefix = NULL;
1348 uschar *ftest_suffix = NULL;
1349 uschar *malware_test_file = NULL;
1350 uschar *real_sender_address;
1351 uschar *originator_home = US"/";
1352 void *reset_point;
1353
1354 struct passwd *pw;
1355 struct stat statbuf;
1356 pid_t passed_qr_pid = (pid_t)0;
1357 int passed_qr_pipe = -1;
1358 gid_t group_list[NGROUPS_MAX];
1359
1360 /* Possible options for -R and -S */
1361
1362 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1363
1364 /* Need to define this in case we need to change the environment in order
1365 to get rid of a bogus time zone. We have to make it char rather than uschar
1366 because some OS define it in /usr/include/unistd.h. */
1367
1368 extern char **environ;
1369
1370 /* If the Exim user and/or group and/or the configuration file owner/group were
1371 defined by ref:name at build time, we must now find the actual uid/gid values.
1372 This is a feature to make the lives of binary distributors easier. */
1373
1374 #ifdef EXIM_USERNAME
1375 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1376   {
1377   if (exim_uid == 0)
1378     {
1379     fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1380       EXIM_USERNAME);
1381     exit(EXIT_FAILURE);
1382     }
1383   exim_gid = pw->pw_gid;
1384   }
1385 else
1386   {
1387   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1388     EXIM_USERNAME);
1389   exit(EXIT_FAILURE);
1390   }
1391 #endif
1392
1393 #ifdef EXIM_GROUPNAME
1394 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1395   {
1396   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1397     EXIM_GROUPNAME);
1398   exit(EXIT_FAILURE);
1399   }
1400 #endif
1401
1402 #ifdef CONFIGURE_OWNERNAME
1403 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1404   {
1405   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1406     CONFIGURE_OWNERNAME);
1407   exit(EXIT_FAILURE);
1408   }
1409 #endif
1410
1411 /* We default the system_filter_user to be the Exim run-time user, as a
1412 sane non-root value. */
1413 system_filter_uid = exim_uid;
1414
1415 #ifdef CONFIGURE_GROUPNAME
1416 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1417   {
1418   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1419     CONFIGURE_GROUPNAME);
1420   exit(EXIT_FAILURE);
1421   }
1422 #endif
1423
1424 /* In the Cygwin environment, some initialization needs doing. It is fudged
1425 in by means of this macro. */
1426
1427 #ifdef OS_INIT
1428 OS_INIT
1429 #endif
1430
1431 /* Check a field which is patched when we are running Exim within its
1432 testing harness; do a fast initial check, and then the whole thing. */
1433
1434 running_in_test_harness =
1435   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1436
1437 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1438 at the start of a program; however, it seems that some environments do not
1439 follow this. A "strange" locale can affect the formatting of timestamps, so we
1440 make quite sure. */
1441
1442 setlocale(LC_ALL, "C");
1443
1444 /* Set up the default handler for timing using alarm(). */
1445
1446 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1447
1448 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1449 because store_malloc writes a log entry on failure. */
1450
1451 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1452 if (log_buffer == NULL)
1453   {
1454   fprintf(stderr, "exim: failed to get store for log buffer\n");
1455   exit(EXIT_FAILURE);
1456   }
1457
1458 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1459 NULL when the daemon is run and the file is closed. We have to use this
1460 indirection, because some systems don't allow writing to the variable "stderr".
1461 */
1462
1463 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1464
1465 /* Arrange for the PCRE regex library to use our store functions. Note that
1466 the normal calls are actually macros that add additional arguments for
1467 debugging purposes so we have to assign specially constructed functions here.
1468 The default is to use store in the stacking pool, but this is overridden in the
1469 regex_must_compile() function. */
1470
1471 pcre_malloc = function_store_get;
1472 pcre_free = function_dummy_free;
1473
1474 /* Ensure there is a big buffer for temporary use in several places. It is put
1475 in malloc store so that it can be freed for enlargement if necessary. */
1476
1477 big_buffer = store_malloc(big_buffer_size);
1478
1479 /* Set up the handler for the data request signal, and set the initial
1480 descriptive text. */
1481
1482 set_process_info("initializing");
1483 os_restarting_signal(SIGUSR1, usr1_handler);
1484
1485 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1486 in the daemon code. For the rest of Exim's uses, we ignore it. */
1487
1488 signal(SIGHUP, SIG_IGN);
1489
1490 /* We don't want to die on pipe errors as the code is written to handle
1491 the write error instead. */
1492
1493 signal(SIGPIPE, SIG_IGN);
1494
1495 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1496 set to SIG_IGN. This causes subprocesses that complete before the parent
1497 process waits for them not to hang around, so when Exim calls wait(), nothing
1498 is there. The wait() code has been made robust against this, but let's ensure
1499 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1500 ending status. We use sigaction rather than plain signal() on those OS where
1501 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1502 problem on AIX with this.) */
1503
1504 #ifdef SA_NOCLDWAIT
1505   {
1506   struct sigaction act;
1507   act.sa_handler = SIG_DFL;
1508   sigemptyset(&(act.sa_mask));
1509   act.sa_flags = 0;
1510   sigaction(SIGCHLD, &act, NULL);
1511   }
1512 #else
1513 signal(SIGCHLD, SIG_DFL);
1514 #endif
1515
1516 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1517 SIGHUP. */
1518
1519 sighup_argv = argv;
1520
1521 /* Set up the version number. Set up the leading 'E' for the external form of
1522 message ids, set the pointer to the internal form, and initialize it to
1523 indicate no message being processed. */
1524
1525 version_init();
1526 message_id_option[0] = '-';
1527 message_id_external = message_id_option + 1;
1528 message_id_external[0] = 'E';
1529 message_id = message_id_external + 1;
1530 message_id[0] = 0;
1531
1532 /* Set the umask to zero so that any files Exim creates using open() are
1533 created with the modes that it specifies. NOTE: Files created with fopen() have
1534 a problem, which was not recognized till rather late (February 2006). With this
1535 umask, such files will be world writeable. (They are all content scanning files
1536 in the spool directory, which isn't world-accessible, so this is not a
1537 disaster, but it's untidy.) I don't want to change this overall setting,
1538 however, because it will interact badly with the open() calls. Instead, there's
1539 now a function called modefopen() that fiddles with the umask while calling
1540 fopen(). */
1541
1542 (void)umask(0);
1543
1544 /* Precompile the regular expression for matching a message id. Keep this in
1545 step with the code that generates ids in the accept.c module. We need to do
1546 this here, because the -M options check their arguments for syntactic validity
1547 using mac_ismsgid, which uses this. */
1548
1549 regex_ismsgid =
1550   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1551
1552 /* Precompile the regular expression that is used for matching an SMTP error
1553 code, possibly extended, at the start of an error message. Note that the
1554 terminating whitespace character is included. */
1555
1556 regex_smtp_code =
1557   regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1558     FALSE, TRUE);
1559
1560 #ifdef WHITELIST_D_MACROS
1561 /* Precompile the regular expression used to filter the content of macros
1562 given to -D for permissibility. */
1563
1564 regex_whitelisted_macro =
1565   regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1566 #endif
1567
1568
1569 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1570 this seems to be a generally accepted convention, since one finds symbolic
1571 links called "mailq" in standard OS configurations. */
1572
1573 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1574     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1575   {
1576   list_queue = TRUE;
1577   receiving_message = FALSE;
1578   called_as = US"-mailq";
1579   }
1580
1581 /* If the program is called as "rmail" treat it as equivalent to
1582 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1583 i.e. preventing a single dot on a line from terminating the message, and
1584 returning with zero return code, even in cases of error (provided an error
1585 message has been sent). */
1586
1587 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1588     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1589   {
1590   dot_ends = FALSE;
1591   called_as = US"-rmail";
1592   errors_sender_rc = EXIT_SUCCESS;
1593   }
1594
1595 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1596 this is a smail convention. */
1597
1598 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1599     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1600   {
1601   smtp_input = smtp_batched_input = TRUE;
1602   called_as = US"-rsmtp";
1603   }
1604
1605 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1606 this is a smail convention. */
1607
1608 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1609     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1610   {
1611   queue_interval = 0;
1612   receiving_message = FALSE;
1613   called_as = US"-runq";
1614   }
1615
1616 /* If the program is called as "newaliases" treat it as equivalent to
1617 "exim -bi"; this is a sendmail convention. */
1618
1619 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1620     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1621   {
1622   bi_option = TRUE;
1623   receiving_message = FALSE;
1624   called_as = US"-newaliases";
1625   }
1626
1627 /* Save the original effective uid for a couple of uses later. It should
1628 normally be root, but in some esoteric environments it may not be. */
1629
1630 original_euid = geteuid();
1631
1632 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1633 to be the same as the real ones. This makes a difference only if Exim is setuid
1634 (or setgid) to something other than root, which could be the case in some
1635 special configurations. */
1636
1637 real_uid = getuid();
1638 real_gid = getgid();
1639
1640 if (real_uid == root_uid)
1641   {
1642   setgid(real_gid);
1643   setuid(real_uid);
1644   }
1645
1646 /* If neither the original real uid nor the original euid was root, Exim is
1647 running in an unprivileged state. */
1648
1649 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1650
1651 /* Scan the program's arguments. Some can be dealt with right away; others are
1652 simply recorded for checking and handling afterwards. Do a high-level switch
1653 on the second character (the one after '-'), to save some effort. */
1654
1655 for (i = 1; i < argc; i++)
1656   {
1657   BOOL badarg = FALSE;
1658   uschar *arg = argv[i];
1659   uschar *argrest;
1660   int switchchar;
1661
1662   /* An argument not starting with '-' is the start of a recipients list;
1663   break out of the options-scanning loop. */
1664
1665   if (arg[0] != '-')
1666     {
1667     recipients_arg = i;
1668     break;
1669     }
1670
1671   /* An option consistion of -- terminates the options */
1672
1673   if (Ustrcmp(arg, "--") == 0)
1674     {
1675     recipients_arg = i + 1;
1676     break;
1677     }
1678
1679   /* Handle flagged options */
1680
1681   switchchar = arg[1];
1682   argrest = arg+2;
1683
1684   /* Make all -ex options synonymous with -oex arguments, since that
1685   is assumed by various callers. Also make -qR options synonymous with -R
1686   options, as that seems to be required as well. Allow for -qqR too, and
1687   the same for -S options. */
1688
1689   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1690       Ustrncmp(arg+1, "qR", 2) == 0 ||
1691       Ustrncmp(arg+1, "qS", 2) == 0)
1692     {
1693     switchchar = arg[2];
1694     argrest++;
1695     }
1696   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1697     {
1698     switchchar = arg[3];
1699     argrest += 2;
1700     queue_2stage = TRUE;
1701     }
1702
1703   /* Make -r synonymous with -f, since it is a documented alias */
1704
1705   else if (arg[1] == 'r') switchchar = 'f';
1706
1707   /* Make -ov synonymous with -v */
1708
1709   else if (Ustrcmp(arg, "-ov") == 0)
1710     {
1711     switchchar = 'v';
1712     argrest++;
1713     }
1714
1715   /* deal with --option_aliases */
1716   else if (switchchar == '-')
1717     {
1718     if (Ustrcmp(argrest, "help") == 0)
1719       {
1720       usage_wanted = TRUE;
1721       break;
1722       }
1723     else if (Ustrcmp(argrest, "version") == 0)
1724       {
1725       switchchar = 'b';
1726       argrest = US"V";
1727       }
1728     }
1729
1730   /* High-level switch on active initial letter */
1731
1732   switch(switchchar)
1733     {
1734     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1735     so has no need of it. */
1736
1737     case 'B':
1738     if (*argrest == 0) i++;       /* Skip over the type */
1739     break;
1740
1741
1742     case 'b':
1743     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1744
1745     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1746        -bdf: Ditto, but in the foreground.
1747     */
1748
1749     if (*argrest == 'd')
1750       {
1751       daemon_listen = TRUE;
1752       if (*(++argrest) == 'f') background_daemon = FALSE;
1753         else if (*argrest != 0) { badarg = TRUE; break; }
1754       }
1755
1756     /* -be:  Run in expansion test mode
1757        -bem: Ditto, but read a message from a file first
1758     */
1759
1760     else if (*argrest == 'e')
1761       {
1762       expansion_test = checking = TRUE;
1763       if (argrest[1] == 'm')
1764         {
1765         if (++i >= argc) { badarg = TRUE; break; }
1766         expansion_test_message = argv[i];
1767         argrest++;
1768         }
1769       if (argrest[1] != 0) { badarg = TRUE; break; }
1770       }
1771
1772     /* -bF:  Run system filter test */
1773
1774     else if (*argrest == 'F')
1775       {
1776       filter_test |= FTEST_SYSTEM;
1777       if (*(++argrest) != 0) { badarg = TRUE; break; }
1778       if (++i < argc) filter_test_sfile = argv[i]; else
1779         {
1780         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1781         exit(EXIT_FAILURE);
1782         }
1783       }
1784
1785     /* -bf:  Run user filter test
1786        -bfd: Set domain for filter testing
1787        -bfl: Set local part for filter testing
1788        -bfp: Set prefix for filter testing
1789        -bfs: Set suffix for filter testing
1790     */
1791
1792     else if (*argrest == 'f')
1793       {
1794       if (*(++argrest) == 0)
1795         {
1796         filter_test |= FTEST_USER;
1797         if (++i < argc) filter_test_ufile = argv[i]; else
1798           {
1799           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1800           exit(EXIT_FAILURE);
1801           }
1802         }
1803       else
1804         {
1805         if (++i >= argc)
1806           {
1807           fprintf(stderr, "exim: string expected after %s\n", arg);
1808           exit(EXIT_FAILURE);
1809           }
1810         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1811         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1812         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1813         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1814         else { badarg = TRUE; break; }
1815         }
1816       }
1817
1818     /* -bh: Host checking - an IP address must follow. */
1819
1820     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1821       {
1822       if (++i >= argc) { badarg = TRUE; break; }
1823       sender_host_address = argv[i];
1824       host_checking = checking = log_testing_mode = TRUE;
1825       host_checking_callout = argrest[1] == 'c';
1826       }
1827
1828     /* -bi: This option is used by sendmail to initialize *the* alias file,
1829     though it has the -oA option to specify a different file. Exim has no
1830     concept of *the* alias file, but since Sun's YP make script calls
1831     sendmail this way, some support must be provided. */
1832
1833     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1834
1835     /* -bm: Accept and deliver message - the default option. Reinstate
1836     receiving_message, which got turned off for all -b options. */
1837
1838     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1839
1840     /* -bmalware: test the filename given for malware */
1841
1842     else if (Ustrcmp(argrest, "malware") == 0)
1843       {
1844       if (++i >= argc) { badarg = TRUE; break; }
1845       malware_test_file = argv[i];
1846       }
1847
1848     /* -bnq: For locally originating messages, do not qualify unqualified
1849     addresses. In the envelope, this causes errors; in header lines they
1850     just get left. */
1851
1852     else if (Ustrcmp(argrest, "nq") == 0)
1853       {
1854       allow_unqualified_sender = FALSE;
1855       allow_unqualified_recipient = FALSE;
1856       }
1857
1858     /* -bpxx: List the contents of the mail queue, in various forms. If
1859     the option is -bpc, just a queue count is needed. Otherwise, if the
1860     first letter after p is r, then order is random. */
1861
1862     else if (*argrest == 'p')
1863       {
1864       if (*(++argrest) == 'c')
1865         {
1866         count_queue = TRUE;
1867         if (*(++argrest) != 0) badarg = TRUE;
1868         break;
1869         }
1870
1871       if (*argrest == 'r')
1872         {
1873         list_queue_option = 8;
1874         argrest++;
1875         }
1876       else list_queue_option = 0;
1877
1878       list_queue = TRUE;
1879
1880       /* -bp: List the contents of the mail queue, top-level only */
1881
1882       if (*argrest == 0) {}
1883
1884       /* -bpu: List the contents of the mail queue, top-level undelivered */
1885
1886       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1887
1888       /* -bpa: List the contents of the mail queue, including all delivered */
1889
1890       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1891
1892       /* Unknown after -bp[r] */
1893
1894       else
1895         {
1896         badarg = TRUE;
1897         break;
1898         }
1899       }
1900
1901
1902     /* -bP: List the configuration variables given as the address list.
1903     Force -v, so configuration errors get displayed. */
1904
1905     else if (Ustrcmp(argrest, "P") == 0)
1906       {
1907       list_options = TRUE;
1908       debug_selector |= D_v;
1909       debug_file = stderr;
1910       }
1911
1912     /* -brt: Test retry configuration lookup */
1913
1914     else if (Ustrcmp(argrest, "rt") == 0)
1915       {
1916       test_retry_arg = i + 1;
1917       goto END_ARG;
1918       }
1919
1920     /* -brw: Test rewrite configuration */
1921
1922     else if (Ustrcmp(argrest, "rw") == 0)
1923       {
1924       test_rewrite_arg = i + 1;
1925       goto END_ARG;
1926       }
1927
1928     /* -bS: Read SMTP commands on standard input, but produce no replies -
1929     all errors are reported by sending messages. */
1930
1931     else if (Ustrcmp(argrest, "S") == 0)
1932       smtp_input = smtp_batched_input = receiving_message = TRUE;
1933
1934     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1935     on standard output. */
1936
1937     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1938
1939     /* -bt: address testing mode */
1940
1941     else if (Ustrcmp(argrest, "t") == 0)
1942       address_test_mode = checking = log_testing_mode = TRUE;
1943
1944     /* -bv: verify addresses */
1945
1946     else if (Ustrcmp(argrest, "v") == 0)
1947       verify_address_mode = checking = log_testing_mode = TRUE;
1948
1949     /* -bvs: verify sender addresses */
1950
1951     else if (Ustrcmp(argrest, "vs") == 0)
1952       {
1953       verify_address_mode = checking = log_testing_mode = TRUE;
1954       verify_as_sender = TRUE;
1955       }
1956
1957     /* -bV: Print version string and support details */
1958
1959     else if (Ustrcmp(argrest, "V") == 0)
1960       {
1961       printf("Exim version %s #%s built %s\n", version_string,
1962         version_cnumber, version_date);
1963       printf("%s\n", CS version_copyright);
1964       version_printed = TRUE;
1965       show_whats_supported(stdout);
1966       }
1967
1968     else badarg = TRUE;
1969     break;
1970
1971
1972     /* -C: change configuration file list; ignore if it isn't really
1973     a change! Enforce a prefix check if required. */
1974
1975     case 'C':
1976     if (*argrest == 0)
1977       {
1978       if(++i < argc) argrest = argv[i]; else
1979         { badarg = TRUE; break; }
1980       }
1981     if (Ustrcmp(config_main_filelist, argrest) != 0)
1982       {
1983       #ifdef ALT_CONFIG_PREFIX
1984       int sep = 0;
1985       int len = Ustrlen(ALT_CONFIG_PREFIX);
1986       uschar *list = argrest;
1987       uschar *filename;
1988       while((filename = string_nextinlist(&list, &sep, big_buffer,
1989              big_buffer_size)) != NULL)
1990         {
1991         if ((Ustrlen(filename) < len ||
1992              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1993              Ustrstr(filename, "/../") != NULL) &&
1994              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1995           {
1996           fprintf(stderr, "-C Permission denied\n");
1997           exit(EXIT_FAILURE);
1998           }
1999         }
2000       #endif
2001       if (real_uid != root_uid)
2002         {
2003         #ifdef TRUSTED_CONFIG_LIST
2004
2005         if (real_uid != exim_uid
2006             #ifdef CONFIGURE_OWNER
2007             && real_uid != config_uid
2008             #endif
2009             )
2010           trusted_config = FALSE;
2011         else
2012           {
2013           FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2014           if (trust_list)
2015             {
2016             struct stat statbuf;
2017
2018             if (fstat(fileno(trust_list), &statbuf) != 0 ||
2019                 (statbuf.st_uid != root_uid        /* owner not root */
2020                  #ifdef CONFIGURE_OWNER
2021                  && statbuf.st_uid != config_uid   /* owner not the special one */
2022                  #endif
2023                    ) ||                            /* or */
2024                 (statbuf.st_gid != root_gid        /* group not root */
2025                  #ifdef CONFIGURE_GROUP
2026                  && statbuf.st_gid != config_gid   /* group not the special one */
2027                  #endif
2028                  && (statbuf.st_mode & 020) != 0   /* group writeable */
2029                    ) ||                            /* or */
2030                 (statbuf.st_mode & 2) != 0)        /* world writeable */
2031               {
2032               trusted_config = FALSE;
2033               fclose(trust_list);
2034               }
2035             else
2036               {
2037               /* Well, the trust list at least is up to scratch... */
2038               void *reset_point = store_get(0);
2039               uschar *trusted_configs[32];
2040               int nr_configs = 0;
2041               int i = 0;
2042
2043               while (Ufgets(big_buffer, big_buffer_size, trust_list))
2044                 {
2045                 uschar *start = big_buffer, *nl;
2046                 while (*start && isspace(*start))
2047                 start++;
2048                 if (*start != '/')
2049                   continue;
2050                 nl = Ustrchr(start, '\n');
2051                 if (nl)
2052                   *nl = 0;
2053                 trusted_configs[nr_configs++] = string_copy(start);
2054                 if (nr_configs == 32)
2055                   break;
2056                 }
2057               fclose(trust_list);
2058
2059               if (nr_configs)
2060                 {
2061                 int sep = 0;
2062                 uschar *list = argrest;
2063                 uschar *filename;
2064                 while (trusted_config && (filename = string_nextinlist(&list,
2065                         &sep, big_buffer, big_buffer_size)) != NULL)
2066                   {
2067                   for (i=0; i < nr_configs; i++)
2068                     {
2069                     if (Ustrcmp(filename, trusted_configs[i]) == 0)
2070                       break;
2071                     }
2072                   if (i == nr_configs)
2073                     {
2074                     trusted_config = FALSE;
2075                     break;
2076                     }
2077                   }
2078                 store_reset(reset_point);
2079                 }
2080               else
2081                 {
2082                 /* No valid prefixes found in trust_list file. */
2083                 trusted_config = FALSE;
2084                 }
2085               }
2086             }
2087           else
2088             {
2089             /* Could not open trust_list file. */
2090             trusted_config = FALSE;
2091             }
2092           }
2093       #else
2094         /* Not root; don't trust config */
2095         trusted_config = FALSE;
2096       #endif
2097         }
2098
2099       config_main_filelist = argrest;
2100       config_changed = TRUE;
2101       }
2102     break;
2103
2104
2105     /* -D: set up a macro definition */
2106
2107     case 'D':
2108     #ifdef DISABLE_D_OPTION
2109     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2110     exit(EXIT_FAILURE);
2111     #else
2112       {
2113       int ptr = 0;
2114       macro_item *mlast = NULL;
2115       macro_item *m;
2116       uschar name[24];
2117       uschar *s = argrest;
2118
2119       while (isspace(*s)) s++;
2120
2121       if (*s < 'A' || *s > 'Z')
2122         {
2123         fprintf(stderr, "exim: macro name set by -D must start with "
2124           "an upper case letter\n");
2125         exit(EXIT_FAILURE);
2126         }
2127
2128       while (isalnum(*s) || *s == '_')
2129         {
2130         if (ptr < sizeof(name)-1) name[ptr++] = *s;
2131         s++;
2132         }
2133       name[ptr] = 0;
2134       if (ptr == 0) { badarg = TRUE; break; }
2135       while (isspace(*s)) s++;
2136       if (*s != 0)
2137         {
2138         if (*s++ != '=') { badarg = TRUE; break; }
2139         while (isspace(*s)) s++;
2140         }
2141
2142       for (m = macros; m != NULL; m = m->next)
2143         {
2144         if (Ustrcmp(m->name, name) == 0)
2145           {
2146           fprintf(stderr, "exim: duplicated -D in command line\n");
2147           exit(EXIT_FAILURE);
2148           }
2149         mlast = m;
2150         }
2151
2152       m = store_get(sizeof(macro_item) + Ustrlen(name));
2153       m->next = NULL;
2154       m->command_line = TRUE;
2155       if (mlast == NULL) macros = m; else mlast->next = m;
2156       Ustrcpy(m->name, name);
2157       m->replacement = string_copy(s);
2158
2159       if (clmacro_count >= MAX_CLMACROS)
2160         {
2161         fprintf(stderr, "exim: too many -D options on command line\n");
2162         exit(EXIT_FAILURE);
2163         }
2164       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2165         m->replacement);
2166       }
2167     #endif
2168     break;
2169
2170     /* -d: Set debug level (see also -v below) or set the drop_cr option.
2171     The latter is now a no-op, retained for compatibility only. If -dd is used,
2172     debugging subprocesses of the daemon is disabled. */
2173
2174     case 'd':
2175     if (Ustrcmp(argrest, "ropcr") == 0)
2176       {
2177       /* drop_cr = TRUE; */
2178       }
2179
2180     /* Use an intermediate variable so that we don't set debugging while
2181     decoding the debugging bits. */
2182
2183     else
2184       {
2185       unsigned int selector = D_default;
2186       debug_selector = 0;
2187       debug_file = NULL;
2188       if (*argrest == 'd')
2189         {
2190         debug_daemon = TRUE;
2191         argrest++;
2192         }
2193       if (*argrest != 0)
2194         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2195           debug_options_count, US"debug", 0);
2196       debug_selector = selector;
2197       }
2198     break;
2199
2200
2201     /* -E: This is a local error message. This option is not intended for
2202     external use at all, but is not restricted to trusted callers because it
2203     does no harm (just suppresses certain error messages) and if Exim is run
2204     not setuid root it won't always be trusted when it generates error
2205     messages using this option. If there is a message id following -E, point
2206     message_reference at it, for logging. */
2207
2208     case 'E':
2209     local_error_message = TRUE;
2210     if (mac_ismsgid(argrest)) message_reference = argrest;
2211     break;
2212
2213
2214     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2215     option, so it looks as if historically the -oex options are also callable
2216     without the leading -o. So we have to accept them. Before the switch,
2217     anything starting -oe has been converted to -e. Exim does not support all
2218     of the sendmail error options. */
2219
2220     case 'e':
2221     if (Ustrcmp(argrest, "e") == 0)
2222       {
2223       arg_error_handling = ERRORS_SENDER;
2224       errors_sender_rc = EXIT_SUCCESS;
2225       }
2226     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2227     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2228     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2229     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2230     else badarg = TRUE;
2231     break;
2232
2233
2234     /* -F: Set sender's full name, used instead of the gecos entry from
2235     the password file. Since users can usually alter their gecos entries,
2236     there's no security involved in using this instead. The data can follow
2237     the -F or be in the next argument. */
2238
2239     case 'F':
2240     if (*argrest == 0)
2241       {
2242       if(++i < argc) argrest = argv[i]; else
2243         { badarg = TRUE; break; }
2244       }
2245     originator_name = argrest;
2246     sender_name_forced = TRUE;
2247     break;
2248
2249
2250     /* -f: Set sender's address - this value is only actually used if Exim is
2251     run by a trusted user, or if untrusted_set_sender is set and matches the
2252     address, except that the null address can always be set by any user. The
2253     test for this happens later, when the value given here is ignored when not
2254     permitted. For an untrusted user, the actual sender is still put in Sender:
2255     if it doesn't match the From: header (unless no_local_from_check is set).
2256     The data can follow the -f or be in the next argument. The -r switch is an
2257     obsolete form of -f but since there appear to be programs out there that
2258     use anything that sendmail has ever supported, better accept it - the
2259     synonymizing is done before the switch above.
2260
2261     At this stage, we must allow domain literal addresses, because we don't
2262     know what the setting of allow_domain_literals is yet. Ditto for trailing
2263     dots and strip_trailing_dot. */
2264
2265     case 'f':
2266       {
2267       int start, end;
2268       uschar *errmess;
2269       if (*argrest == 0)
2270         {
2271         if (i+1 < argc) argrest = argv[++i]; else
2272           { badarg = TRUE; break; }
2273         }
2274       if (*argrest == 0)
2275         {
2276         sender_address = string_sprintf("");  /* Ensure writeable memory */
2277         }
2278       else
2279         {
2280         uschar *temp = argrest + Ustrlen(argrest) - 1;
2281         while (temp >= argrest && isspace(*temp)) temp--;
2282         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2283         allow_domain_literals = TRUE;
2284         strip_trailing_dot = TRUE;
2285         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2286           &sender_address_domain, TRUE);
2287         allow_domain_literals = FALSE;
2288         strip_trailing_dot = FALSE;
2289         if (sender_address == NULL)
2290           {
2291           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2292           return EXIT_FAILURE;
2293           }
2294         }
2295       sender_address_forced = TRUE;
2296       }
2297     break;
2298
2299     /* This is some Sendmail thing which can be ignored */
2300
2301     case 'G':
2302     break;
2303
2304     /* -h: Set the hop count for an incoming message. Exim does not currently
2305     support this; it always computes it by counting the Received: headers.
2306     To put it in will require a change to the spool header file format. */
2307
2308     case 'h':
2309     if (*argrest == 0)
2310       {
2311       if(++i < argc) argrest = argv[i]; else
2312         { badarg = TRUE; break; }
2313       }
2314     if (!isdigit(*argrest)) badarg = TRUE;
2315     break;
2316
2317
2318     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2319     not to be documented for sendmail but mailx (at least) uses it) */
2320
2321     case 'i':
2322     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2323     break;
2324
2325
2326     case 'M':
2327     receiving_message = FALSE;
2328
2329     /* -MC:  continue delivery of another message via an existing open
2330     file descriptor. This option is used for an internal call by the
2331     smtp transport when there is a pending message waiting to go to an
2332     address to which it has got a connection. Five subsequent arguments are
2333     required: transport name, host name, IP address, sequence number, and
2334     message_id. Transports may decline to create new processes if the sequence
2335     number gets too big. The channel is stdin. This (-MC) must be the last
2336     argument. There's a subsequent check that the real-uid is privileged.
2337
2338     If we are running in the test harness. delay for a bit, to let the process
2339     that set this one up complete. This makes for repeatability of the logging,
2340     etc. output. */
2341
2342     if (Ustrcmp(argrest, "C") == 0)
2343       {
2344       union sockaddr_46 interface_sock;
2345       EXIM_SOCKLEN_T size = sizeof(interface_sock);
2346
2347       if (argc != i + 6)
2348         {
2349         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2350         return EXIT_FAILURE;
2351         }
2352
2353       if (msg_action_arg >= 0)
2354         {
2355         fprintf(stderr, "exim: incompatible arguments\n");
2356         return EXIT_FAILURE;
2357         }
2358
2359       continue_transport = argv[++i];
2360       continue_hostname = argv[++i];
2361       continue_host_address = argv[++i];
2362       continue_sequence = Uatoi(argv[++i]);
2363       msg_action = MSG_DELIVER;
2364       msg_action_arg = ++i;
2365       forced_delivery = TRUE;
2366       queue_run_pid = passed_qr_pid;
2367       queue_run_pipe = passed_qr_pipe;
2368
2369       if (!mac_ismsgid(argv[i]))
2370         {
2371         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2372           argv[i]);
2373         return EXIT_FAILURE;
2374         }
2375
2376       /* Set up $sending_ip_address and $sending_port */
2377
2378       if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2379           &size) == 0)
2380         sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2381           &sending_port);
2382       else
2383         {
2384         fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2385           strerror(errno));
2386         return EXIT_FAILURE;
2387         }
2388
2389       if (running_in_test_harness) millisleep(500);
2390       break;
2391       }
2392
2393     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2394     precedes -MC (see above). The flag indicates that the host to which
2395     Exim is connected has accepted an AUTH sequence. */
2396
2397     else if (Ustrcmp(argrest, "CA") == 0)
2398       {
2399       smtp_authenticated = TRUE;
2400       break;
2401       }
2402
2403     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2404     it preceded -MC (see above) */
2405
2406     else if (Ustrcmp(argrest, "CP") == 0)
2407       {
2408       smtp_use_pipelining = TRUE;
2409       break;
2410       }
2411
2412     /* -MCQ: pass on the pid of the queue-running process that started
2413     this chain of deliveries and the fd of its synchronizing pipe; this
2414     is useful only when it precedes -MC (see above) */
2415
2416     else if (Ustrcmp(argrest, "CQ") == 0)
2417       {
2418       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2419         else badarg = TRUE;
2420       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2421         else badarg = TRUE;
2422       break;
2423       }
2424
2425     /* -MCS: set the smtp_use_size flag; this is useful only when it
2426     precedes -MC (see above) */
2427
2428     else if (Ustrcmp(argrest, "CS") == 0)
2429       {
2430       smtp_use_size = TRUE;
2431       break;
2432       }
2433
2434     /* -MCT: set the tls_offered flag; this is useful only when it
2435     precedes -MC (see above). The flag indicates that the host to which
2436     Exim is connected has offered TLS support. */
2437
2438     #ifdef SUPPORT_TLS
2439     else if (Ustrcmp(argrest, "CT") == 0)
2440       {
2441       tls_offered = TRUE;
2442       break;
2443       }
2444     #endif
2445
2446     /* -M[x]: various operations on the following list of message ids:
2447        -M    deliver the messages, ignoring next retry times and thawing
2448        -Mc   deliver the messages, checking next retry times, no thawing
2449        -Mf   freeze the messages
2450        -Mg   give up on the messages
2451        -Mt   thaw the messages
2452        -Mrm  remove the messages
2453     In the above cases, this must be the last option. There are also the
2454     following options which are followed by a single message id, and which
2455     act on that message. Some of them use the "recipient" addresses as well.
2456        -Mar  add recipient(s)
2457        -Mmad mark all recipients delivered
2458        -Mmd  mark recipients(s) delivered
2459        -Mes  edit sender
2460        -Mset load a message for use with -be
2461        -Mvb  show body
2462        -Mvc  show copy (of whole message, in RFC 2822 format)
2463        -Mvh  show header
2464        -Mvl  show log
2465     */
2466
2467     else if (*argrest == 0)
2468       {
2469       msg_action = MSG_DELIVER;
2470       forced_delivery = deliver_force_thaw = TRUE;
2471       }
2472     else if (Ustrcmp(argrest, "ar") == 0)
2473       {
2474       msg_action = MSG_ADD_RECIPIENT;
2475       one_msg_action = TRUE;
2476       }
2477     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2478     else if (Ustrcmp(argrest, "es") == 0)
2479       {
2480       msg_action = MSG_EDIT_SENDER;
2481       one_msg_action = TRUE;
2482       }
2483     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2484     else if (Ustrcmp(argrest, "g") == 0)
2485       {
2486       msg_action = MSG_DELIVER;
2487       deliver_give_up = TRUE;
2488       }
2489     else if (Ustrcmp(argrest, "mad") == 0)
2490       {
2491       msg_action = MSG_MARK_ALL_DELIVERED;
2492       }
2493     else if (Ustrcmp(argrest, "md") == 0)
2494       {
2495       msg_action = MSG_MARK_DELIVERED;
2496       one_msg_action = TRUE;
2497       }
2498     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2499     else if (Ustrcmp(argrest, "set") == 0)
2500       {
2501       msg_action = MSG_LOAD;
2502       one_msg_action = TRUE;
2503       }
2504     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2505     else if (Ustrcmp(argrest, "vb") == 0)
2506       {
2507       msg_action = MSG_SHOW_BODY;
2508       one_msg_action = TRUE;
2509       }
2510     else if (Ustrcmp(argrest, "vc") == 0)
2511       {
2512       msg_action = MSG_SHOW_COPY;
2513       one_msg_action = TRUE;
2514       }
2515     else if (Ustrcmp(argrest, "vh") == 0)
2516       {
2517       msg_action = MSG_SHOW_HEADER;
2518       one_msg_action = TRUE;
2519       }
2520     else if (Ustrcmp(argrest, "vl") == 0)
2521       {
2522       msg_action = MSG_SHOW_LOG;
2523       one_msg_action = TRUE;
2524       }
2525     else { badarg = TRUE; break; }
2526
2527     /* All the -Mxx options require at least one message id. */
2528
2529     msg_action_arg = i + 1;
2530     if (msg_action_arg >= argc)
2531       {
2532       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2533       return EXIT_FAILURE;
2534       }
2535
2536     /* Some require only message ids to follow */
2537
2538     if (!one_msg_action)
2539       {
2540       int j;
2541       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2542         {
2543         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2544           argv[j], arg);
2545         return EXIT_FAILURE;
2546         }
2547       goto END_ARG;   /* Remaining args are ids */
2548       }
2549
2550     /* Others require only one message id, possibly followed by addresses,
2551     which will be handled as normal arguments. */
2552
2553     else
2554       {
2555       if (!mac_ismsgid(argv[msg_action_arg]))
2556         {
2557         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2558           argv[msg_action_arg], arg);
2559         return EXIT_FAILURE;
2560         }
2561       i++;
2562       }
2563     break;
2564
2565
2566     /* Some programs seem to call the -om option without the leading o;
2567     for sendmail it askes for "me too". Exim always does this. */
2568
2569     case 'm':
2570     if (*argrest != 0) badarg = TRUE;
2571     break;
2572
2573
2574     /* -N: don't do delivery - a debugging option that stops transports doing
2575     their thing. It implies debugging at the D_v level. */
2576
2577     case 'N':
2578     if (*argrest == 0)
2579       {
2580       dont_deliver = TRUE;
2581       debug_selector |= D_v;
2582       debug_file = stderr;
2583       }
2584     else badarg = TRUE;
2585     break;
2586
2587
2588     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2589     it. */
2590
2591     case 'n':
2592     break;
2593
2594     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2595     option to the specified value. This form uses long names. We need to handle
2596     -O option=value and -Ooption=value. */
2597
2598     case 'O':
2599     if (*argrest == 0)
2600       {
2601       if (++i >= argc)
2602         {
2603         fprintf(stderr, "exim: string expected after -O\n");
2604         exit(EXIT_FAILURE);
2605         }
2606       }
2607     break;
2608
2609     case 'o':
2610
2611     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2612     file" option). */
2613
2614     if (*argrest == 'A')
2615       {
2616       alias_arg = argrest + 1;
2617       if (alias_arg[0] == 0)
2618         {
2619         if (i+1 < argc) alias_arg = argv[++i]; else
2620           {
2621           fprintf(stderr, "exim: string expected after -oA\n");
2622           exit(EXIT_FAILURE);
2623           }
2624         }
2625       }
2626
2627     /* -oB: Set a connection message max value for remote deliveries */
2628
2629     else if (*argrest == 'B')
2630       {
2631       uschar *p = argrest + 1;
2632       if (p[0] == 0)
2633         {
2634         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2635           {
2636           connection_max_messages = 1;
2637           p = NULL;
2638           }
2639         }
2640
2641       if (p != NULL)
2642         {
2643         if (!isdigit(*p))
2644           {
2645           fprintf(stderr, "exim: number expected after -oB\n");
2646           exit(EXIT_FAILURE);
2647           }
2648         connection_max_messages = Uatoi(p);
2649         }
2650       }
2651
2652     /* -odb: background delivery */
2653
2654     else if (Ustrcmp(argrest, "db") == 0)
2655       {
2656       synchronous_delivery = FALSE;
2657       arg_queue_only = FALSE;
2658       queue_only_set = TRUE;
2659       }
2660
2661     /* -odf: foreground delivery (smail-compatible option); same effect as
2662        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2663     */
2664
2665     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2666       {
2667       synchronous_delivery = TRUE;
2668       arg_queue_only = FALSE;
2669       queue_only_set = TRUE;
2670       }
2671
2672     /* -odq: queue only */
2673
2674     else if (Ustrcmp(argrest, "dq") == 0)
2675       {
2676       synchronous_delivery = FALSE;
2677       arg_queue_only = TRUE;
2678       queue_only_set = TRUE;
2679       }
2680
2681     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2682     but no remote delivery */
2683
2684     else if (Ustrcmp(argrest, "dqs") == 0)
2685       {
2686       queue_smtp = TRUE;
2687       arg_queue_only = FALSE;
2688       queue_only_set = TRUE;
2689       }
2690
2691     /* -oex: Sendmail error flags. As these are also accepted without the
2692     leading -o prefix, for compatibility with vacation and other callers,
2693     they are handled with -e above. */
2694
2695     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2696        -oitrue: Another sendmail syntax for the same */
2697
2698     else if (Ustrcmp(argrest, "i") == 0 ||
2699              Ustrcmp(argrest, "itrue") == 0)
2700       dot_ends = FALSE;
2701
2702     /* -oM*: Set various characteristics for an incoming message; actually
2703     acted on for trusted callers only. */
2704
2705     else if (*argrest == 'M')
2706       {
2707       if (i+1 >= argc)
2708         {
2709         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2710         exit(EXIT_FAILURE);
2711         }
2712
2713       /* -oMa: Set sender host address */
2714
2715       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2716
2717       /* -oMaa: Set authenticator name */
2718
2719       else if (Ustrcmp(argrest, "Maa") == 0)
2720         sender_host_authenticated = argv[++i];
2721
2722       /* -oMas: setting authenticated sender */
2723
2724       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2725
2726       /* -oMai: setting authenticated id */
2727
2728       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2729
2730       /* -oMi: Set incoming interface address */
2731
2732       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2733
2734       /* -oMr: Received protocol */
2735
2736       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2737
2738       /* -oMs: Set sender host name */
2739
2740       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2741
2742       /* -oMt: Set sender ident */
2743
2744       else if (Ustrcmp(argrest, "Mt") == 0)
2745         {
2746         sender_ident_set = TRUE;
2747         sender_ident = argv[++i];
2748         }
2749
2750       /* Else a bad argument */
2751
2752       else
2753         {
2754         badarg = TRUE;
2755         break;
2756         }
2757       }
2758
2759     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2760     seem to call this as -m (undocumented), so that is also accepted (see
2761     above). */
2762
2763     else if (Ustrcmp(argrest, "m") == 0) {}
2764
2765     /* -oo: An ancient flag for old-style addresses which still seems to
2766     crop up in some calls (see in SCO). */
2767
2768     else if (Ustrcmp(argrest, "o") == 0) {}
2769
2770     /* -oP <name>: set pid file path for daemon */
2771
2772     else if (Ustrcmp(argrest, "P") == 0)
2773       override_pid_file_path = argv[++i];
2774
2775     /* -or <n>: set timeout for non-SMTP acceptance
2776        -os <n>: set timeout for SMTP acceptance */
2777
2778     else if (*argrest == 'r' || *argrest == 's')
2779       {
2780       int *tp = (*argrest == 'r')?
2781         &arg_receive_timeout : &arg_smtp_receive_timeout;
2782       if (argrest[1] == 0)
2783         {
2784         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2785         }
2786       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2787       if (*tp < 0)
2788         {
2789         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2790         exit(EXIT_FAILURE);
2791         }
2792       }
2793
2794     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2795
2796     else if (Ustrcmp(argrest, "X") == 0)
2797       override_local_interfaces = argv[++i];
2798
2799     /* Unknown -o argument */
2800
2801     else badarg = TRUE;
2802     break;
2803
2804
2805     /* -ps: force Perl startup; -pd force delayed Perl startup */
2806
2807     case 'p':
2808     #ifdef EXIM_PERL
2809     if (*argrest == 's' && argrest[1] == 0)
2810       {
2811       perl_start_option = 1;
2812       break;
2813       }
2814     if (*argrest == 'd' && argrest[1] == 0)
2815       {
2816       perl_start_option = -1;
2817       break;
2818       }
2819     #endif
2820
2821     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2822     which sets the host protocol and host name */
2823
2824     if (*argrest == 0)
2825       {
2826       if (i+1 < argc) argrest = argv[++i]; else
2827         { badarg = TRUE; break; }
2828       }
2829
2830     if (*argrest != 0)
2831       {
2832       uschar *hn = Ustrchr(argrest, ':');
2833       if (hn == NULL)
2834         {
2835         received_protocol = argrest;
2836         }
2837       else
2838         {
2839         received_protocol = string_copyn(argrest, hn - argrest);
2840         sender_host_name = hn + 1;
2841         }
2842       }
2843     break;
2844
2845
2846     case 'q':
2847     receiving_message = FALSE;
2848     if (queue_interval >= 0)
2849       {
2850       fprintf(stderr, "exim: -q specified more than once\n");
2851       exit(EXIT_FAILURE);
2852       }
2853
2854     /* -qq...: Do queue runs in a 2-stage manner */
2855
2856     if (*argrest == 'q')
2857       {
2858       queue_2stage = TRUE;
2859       argrest++;
2860       }
2861
2862     /* -qi...: Do only first (initial) deliveries */
2863
2864     if (*argrest == 'i')
2865       {
2866       queue_run_first_delivery = TRUE;
2867       argrest++;
2868       }
2869
2870     /* -qf...: Run the queue, forcing deliveries
2871        -qff..: Ditto, forcing thawing as well */
2872
2873     if (*argrest == 'f')
2874       {
2875       queue_run_force = TRUE;
2876       if (*(++argrest) == 'f')
2877         {
2878         deliver_force_thaw = TRUE;
2879         argrest++;
2880         }
2881       }
2882
2883     /* -q[f][f]l...: Run the queue only on local deliveries */
2884
2885     if (*argrest == 'l')
2886       {
2887       queue_run_local = TRUE;
2888       argrest++;
2889       }
2890
2891     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2892     optionally starting from a given message id. */
2893
2894     if (*argrest == 0 &&
2895         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2896       {
2897       queue_interval = 0;
2898       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2899         start_queue_run_id = argv[++i];
2900       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2901         stop_queue_run_id = argv[++i];
2902       }
2903
2904     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2905     optionally local only. */
2906
2907     else
2908       {
2909       if (*argrest != 0)
2910         queue_interval = readconf_readtime(argrest, 0, FALSE);
2911       else
2912         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2913       if (queue_interval <= 0)
2914         {
2915         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2916         exit(EXIT_FAILURE);
2917         }
2918       }
2919     break;
2920
2921
2922     case 'R':   /* Synonymous with -qR... */
2923     receiving_message = FALSE;
2924
2925     /* -Rf:   As -R (below) but force all deliveries,
2926        -Rff:  Ditto, but also thaw all frozen messages,
2927        -Rr:   String is regex
2928        -Rrf:  Regex and force
2929        -Rrff: Regex and force and thaw
2930
2931     in all cases provided there are no further characters in this
2932     argument. */
2933
2934     if (*argrest != 0)
2935       {
2936       int i;
2937       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2938         {
2939         if (Ustrcmp(argrest, rsopts[i]) == 0)
2940           {
2941           if (i != 2) queue_run_force = TRUE;
2942           if (i >= 2) deliver_selectstring_regex = TRUE;
2943           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2944           argrest += Ustrlen(rsopts[i]);
2945           }
2946         }
2947       }
2948
2949     /* -R: Set string to match in addresses for forced queue run to
2950     pick out particular messages. */
2951
2952     if (*argrest == 0)
2953       {
2954       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2955         {
2956         fprintf(stderr, "exim: string expected after -R\n");
2957         exit(EXIT_FAILURE);
2958         }
2959       }
2960     else deliver_selectstring = argrest;
2961     break;
2962
2963
2964     /* -r: an obsolete synonym for -f (see above) */
2965
2966
2967     /* -S: Like -R but works on sender. */
2968
2969     case 'S':   /* Synonymous with -qS... */
2970     receiving_message = FALSE;
2971
2972     /* -Sf:   As -S (below) but force all deliveries,
2973        -Sff:  Ditto, but also thaw all frozen messages,
2974        -Sr:   String is regex
2975        -Srf:  Regex and force
2976        -Srff: Regex and force and thaw
2977
2978     in all cases provided there are no further characters in this
2979     argument. */
2980
2981     if (*argrest != 0)
2982       {
2983       int i;
2984       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2985         {
2986         if (Ustrcmp(argrest, rsopts[i]) == 0)
2987           {
2988           if (i != 2) queue_run_force = TRUE;
2989           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2990           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2991           argrest += Ustrlen(rsopts[i]);
2992           }
2993         }
2994       }
2995
2996     /* -S: Set string to match in addresses for forced queue run to
2997     pick out particular messages. */
2998
2999     if (*argrest == 0)
3000       {
3001       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3002         {
3003         fprintf(stderr, "exim: string expected after -S\n");
3004         exit(EXIT_FAILURE);
3005         }
3006       }
3007     else deliver_selectstring_sender = argrest;
3008     break;
3009
3010     /* -Tqt is an option that is exclusively for use by the testing suite.
3011     It is not recognized in other circumstances. It allows for the setting up
3012     of explicit "queue times" so that various warning/retry things can be
3013     tested. Otherwise variability of clock ticks etc. cause problems. */
3014
3015     case 'T':
3016     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3017       fudged_queue_times = argv[++i];
3018     else badarg = TRUE;
3019     break;
3020
3021
3022     /* -t: Set flag to extract recipients from body of message. */
3023
3024     case 't':
3025     if (*argrest == 0) extract_recipients = TRUE;
3026
3027     /* -ti: Set flag to extract recipients from body of message, and also
3028     specify that dot does not end the message. */
3029
3030     else if (Ustrcmp(argrest, "i") == 0)
3031       {
3032       extract_recipients = TRUE;
3033       dot_ends = FALSE;
3034       }
3035
3036     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3037
3038     #ifdef SUPPORT_TLS
3039     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
3040     #endif
3041
3042     else badarg = TRUE;
3043     break;
3044
3045
3046     /* -U: This means "initial user submission" in sendmail, apparently. The
3047     doc claims that in future sendmail may refuse syntactically invalid
3048     messages instead of fixing them. For the moment, we just ignore it. */
3049
3050     case 'U':
3051     break;
3052
3053
3054     /* -v: verify things - this is a very low-level debugging */
3055
3056     case 'v':
3057     if (*argrest == 0)
3058       {
3059       debug_selector |= D_v;
3060       debug_file = stderr;
3061       }
3062     else badarg = TRUE;
3063     break;
3064
3065
3066     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3067
3068       The -x flag tells the sendmail command that mail from a local
3069       mail program has National Language Support (NLS) extended characters
3070       in the body of the mail item. The sendmail command can send mail with
3071       extended NLS characters across networks that normally corrupts these
3072       8-bit characters.
3073
3074     As Exim is 8-bit clean, it just ignores this flag. */
3075
3076     case 'x':
3077     if (*argrest != 0) badarg = TRUE;
3078     break;
3079
3080     /* All other initial characters are errors */
3081
3082     default:
3083     badarg = TRUE;
3084     break;
3085     }         /* End of high-level switch statement */
3086
3087   /* Failed to recognize the option, or syntax error */
3088
3089   if (badarg)
3090     {
3091     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3092       "option %s\n", arg);
3093     exit(EXIT_FAILURE);
3094     }
3095   }
3096
3097
3098 /* If -R or -S have been specified without -q, assume a single queue run. */
3099
3100 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3101   queue_interval < 0) queue_interval = 0;
3102
3103
3104 END_ARG:
3105 /* If usage_wanted is set we call the usage function - which never returns */
3106 if (usage_wanted) exim_usage(called_as);
3107
3108 /* Arguments have been processed. Check for incompatibilities. */
3109 if ((
3110     (smtp_input || extract_recipients || recipients_arg < argc) &&
3111     (daemon_listen || queue_interval >= 0 || bi_option ||
3112       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3113       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3114     ) ||
3115     (
3116     msg_action_arg > 0 &&
3117     (daemon_listen || queue_interval >= 0 || list_options ||
3118       (checking && msg_action != MSG_LOAD) ||
3119       bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3120     ) ||
3121     (
3122     (daemon_listen || queue_interval >= 0) &&
3123     (sender_address != NULL || list_options || list_queue || checking ||
3124       bi_option)
3125     ) ||
3126     (
3127     daemon_listen && queue_interval == 0
3128     ) ||
3129     (
3130     list_options &&
3131     (checking || smtp_input || extract_recipients ||
3132       filter_test != FTEST_NONE || bi_option)
3133     ) ||
3134     (
3135     verify_address_mode &&
3136     (address_test_mode || smtp_input || extract_recipients ||
3137       filter_test != FTEST_NONE || bi_option)
3138     ) ||
3139     (
3140     address_test_mode && (smtp_input || extract_recipients ||
3141       filter_test != FTEST_NONE || bi_option)
3142     ) ||
3143     (
3144     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3145       extract_recipients)
3146     ) ||
3147     (
3148     deliver_selectstring != NULL && queue_interval < 0
3149     ) ||
3150     (
3151     msg_action == MSG_LOAD &&
3152       (!expansion_test || expansion_test_message != NULL)
3153     )
3154    )
3155   {
3156   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3157   exit(EXIT_FAILURE);
3158   }
3159
3160 /* If debugging is set up, set the file and the file descriptor to pass on to
3161 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3162 to run in the foreground. */
3163
3164 if (debug_selector != 0)
3165   {
3166   debug_file = stderr;
3167   debug_fd = fileno(debug_file);
3168   background_daemon = FALSE;
3169   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
3170   if (debug_selector != D_v)    /* -v only doesn't show this */
3171     {
3172     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3173       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3174       debug_selector);
3175     if (!version_printed)
3176       show_whats_supported(stderr);
3177     }
3178   }
3179
3180 /* When started with root privilege, ensure that the limits on the number of
3181 open files and the number of processes (where that is accessible) are
3182 sufficiently large, or are unset, in case Exim has been called from an
3183 environment where the limits are screwed down. Not all OS have the ability to
3184 change some of these limits. */
3185
3186 if (unprivileged)
3187   {
3188   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3189   }
3190 else
3191   {
3192   struct rlimit rlp;
3193
3194   #ifdef RLIMIT_NOFILE
3195   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3196     {
3197     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3198       strerror(errno));
3199     rlp.rlim_cur = rlp.rlim_max = 0;
3200     }
3201
3202   /* I originally chose 1000 as a nice big number that was unlikely to
3203   be exceeded. It turns out that some older OS have a fixed upper limit of
3204   256. */
3205
3206   if (rlp.rlim_cur < 1000)
3207     {
3208     rlp.rlim_cur = rlp.rlim_max = 1000;
3209     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3210       {
3211       rlp.rlim_cur = rlp.rlim_max = 256;
3212       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3213         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3214           strerror(errno));
3215       }
3216     }
3217   #endif
3218
3219   #ifdef RLIMIT_NPROC
3220   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3221     {
3222     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3223       strerror(errno));
3224     rlp.rlim_cur = rlp.rlim_max = 0;
3225     }
3226
3227   #ifdef RLIM_INFINITY
3228   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3229     {
3230     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3231   #else
3232   if (rlp.rlim_cur < 1000)
3233     {
3234     rlp.rlim_cur = rlp.rlim_max = 1000;
3235   #endif
3236     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3237       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3238         strerror(errno));
3239     }
3240   #endif
3241   }
3242
3243 /* Exim is normally entered as root (but some special configurations are
3244 possible that don't do this). However, it always spins off sub-processes that
3245 set their uid and gid as required for local delivery. We don't want to pass on
3246 any extra groups that root may belong to, so we want to get rid of them all at
3247 this point.
3248
3249 We need to obey setgroups() at this stage, before possibly giving up root
3250 privilege for a changed configuration file, but later on we might need to
3251 check on the additional groups for the admin user privilege - can't do that
3252 till after reading the config, which might specify the exim gid. Therefore,
3253 save the group list here first. */
3254
3255 group_count = getgroups(NGROUPS_MAX, group_list);
3256
3257 /* There is a fundamental difference in some BSD systems in the matter of
3258 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3259 known not to be different. On the "different" systems there is a single group
3260 list, and the first entry in it is the current group. On all other versions of
3261 Unix there is a supplementary group list, which is in *addition* to the current
3262 group. Consequently, to get rid of all extraneous groups on a "standard" system
3263 you pass over 0 groups to setgroups(), while on a "different" system you pass
3264 over a single group - the current group, which is always the first group in the
3265 list. Calling setgroups() with zero groups on a "different" system results in
3266 an error return. The following code should cope with both types of system.
3267
3268 However, if this process isn't running as root, setgroups() can't be used
3269 since you have to be root to run it, even if throwing away groups. Not being
3270 root here happens only in some unusual configurations. We just ignore the
3271 error. */
3272
3273 if (setgroups(0, NULL) != 0)
3274   {
3275   if (setgroups(1, group_list) != 0 && !unprivileged)
3276     {
3277     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3278     exit(EXIT_FAILURE);
3279     }
3280   }
3281
3282 /* If the configuration file name has been altered by an argument on the
3283 command line (either a new file name or a macro definition) and the caller is
3284 not root, or if this is a filter testing run, remove any setuid privilege the
3285 program has and run as the underlying user.
3286
3287 The exim user is locked out of this, which severely restricts the use of -C
3288 for some purposes.
3289
3290 Otherwise, set the real ids to the effective values (should be root unless run
3291 from inetd, which it can either be root or the exim uid, if one is configured).
3292
3293 There is a private mechanism for bypassing some of this, in order to make it
3294 possible to test lots of configurations automatically, without having either to
3295 recompile each time, or to patch in an actual configuration file name and other
3296 values (such as the path name). If running in the test harness, pretend that
3297 configuration file changes and macro definitions haven't happened. */
3298
3299 if ((                                            /* EITHER */
3300     (!trusted_config ||                          /* Config changed, or */
3301      !macros_trusted()) &&                       /*  impermissible macros and */
3302     real_uid != root_uid &&                      /* Not root, and */
3303     !running_in_test_harness                     /* Not fudged */
3304     ) ||                                         /*   OR   */
3305     expansion_test                               /* expansion testing */
3306     ||                                           /*   OR   */
3307     filter_test != FTEST_NONE)                   /* Filter testing */
3308   {
3309   setgroups(group_count, group_list);
3310   exim_setugid(real_uid, real_gid, FALSE,
3311     US"-C, -D, -be or -bf forces real uid");
3312   removed_privilege = TRUE;
3313
3314   /* In the normal case when Exim is called like this, stderr is available
3315   and should be used for any logging information because attempts to write
3316   to the log will usually fail. To arrange this, we unset really_exim. However,
3317   if no stderr is available there is no point - we might as well have a go
3318   at the log (if it fails, syslog will be written). */
3319
3320   if (log_stderr != NULL) really_exim = FALSE;
3321   }
3322
3323 /* Privilege is to be retained for the moment. It may be dropped later,
3324 depending on the job that this Exim process has been asked to do. For now, set
3325 the real uid to the effective so that subsequent re-execs of Exim are done by a
3326 privileged user. */
3327
3328 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3329
3330 /* If testing a filter, open the file(s) now, before wasting time doing other
3331 setups and reading the message. */
3332
3333 if ((filter_test & FTEST_SYSTEM) != 0)
3334   {
3335   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3336   if (filter_sfd < 0)
3337     {
3338     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3339       strerror(errno));
3340     return EXIT_FAILURE;
3341     }
3342   }
3343
3344 if ((filter_test & FTEST_USER) != 0)
3345   {
3346   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3347   if (filter_ufd < 0)
3348     {
3349     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3350       strerror(errno));
3351     return EXIT_FAILURE;
3352     }
3353   }
3354
3355 /* Read the main runtime configuration data; this gives up if there
3356 is a failure. It leaves the configuration file open so that the subsequent
3357 configuration data for delivery can be read if needed. */
3358
3359 readconf_main();
3360
3361 /* Handle the decoding of logging options. */
3362
3363 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3364   log_selector_string, log_options, log_options_count, US"log", 0);
3365
3366 DEBUG(D_any)
3367   {
3368   debug_printf("configuration file is %s\n", config_main_filename);
3369   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3370     log_extra_selector);
3371   }
3372
3373 /* If domain literals are not allowed, check the sender address that was
3374 supplied with -f. Ditto for a stripped trailing dot. */
3375
3376 if (sender_address != NULL)
3377   {
3378   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3379     {
3380     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3381       "allowed\n", sender_address);
3382     return EXIT_FAILURE;
3383     }
3384   if (f_end_dot && !strip_trailing_dot)
3385     {
3386     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3387       "(trailing dot not allowed)\n", sender_address);
3388     return EXIT_FAILURE;
3389     }
3390   }
3391
3392 /* Paranoia check of maximum lengths of certain strings. There is a check
3393 on the length of the log file path in log.c, which will come into effect
3394 if there are any calls to write the log earlier than this. However, if we
3395 get this far but the string is very long, it is better to stop now than to
3396 carry on and (e.g.) receive a message and then have to collapse. The call to
3397 log_write() from here will cause the ultimate panic collapse if the complete
3398 file name exceeds the buffer length. */
3399
3400 if (Ustrlen(log_file_path) > 200)
3401   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3402     "log_file_path is longer than 200 chars: aborting");
3403
3404 if (Ustrlen(pid_file_path) > 200)
3405   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3406     "pid_file_path is longer than 200 chars: aborting");
3407
3408 if (Ustrlen(spool_directory) > 200)
3409   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3410     "spool_directory is longer than 200 chars: aborting");
3411
3412 /* Length check on the process name given to syslog for its TAG field,
3413 which is only permitted to be 32 characters or less. See RFC 3164. */
3414
3415 if (Ustrlen(syslog_processname) > 32)
3416   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3417     "syslog_processname is longer than 32 chars: aborting");
3418
3419 /* In some operating systems, the environment variable TMPDIR controls where
3420 temporary files are created; Exim doesn't use these (apart from when delivering
3421 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3422 If TMPDIR is found in the environment, reset it to the value defined in the
3423 TMPDIR macro, if this macro is defined. */
3424
3425 #ifdef TMPDIR
3426   {
3427   uschar **p;
3428   for (p = USS environ; *p != NULL; p++)
3429     {
3430     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3431         Ustrcmp(*p+7, TMPDIR) != 0)
3432       {
3433       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3434       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3435       *p = newp;
3436       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3437       }
3438     }
3439   }
3440 #endif
3441
3442 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3443 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3444 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3445 called by a user who has set the TZ variable. This then affects the timestamps
3446 in log files and in Received: headers, and any created Date: header lines. The
3447 required timezone is settable in the configuration file, so nothing can be done
3448 about this earlier - but hopefully nothing will normally be logged earlier than
3449 this. We have to make a new environment if TZ is wrong, but don't bother if
3450 timestamps_utc is set, because then all times are in UTC anyway. */
3451
3452 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3453   {
3454   timestamps_utc = TRUE;
3455   }
3456 else
3457   {
3458   uschar *envtz = US getenv("TZ");
3459   if ((envtz == NULL && timezone_string != NULL) ||
3460       (envtz != NULL &&
3461         (timezone_string == NULL ||
3462          Ustrcmp(timezone_string, envtz) != 0)))
3463     {
3464     uschar **p = USS environ;
3465     uschar **new;
3466     uschar **newp;
3467     int count = 0;
3468     while (*p++ != NULL) count++;
3469     if (envtz == NULL) count++;
3470     newp = new = malloc(sizeof(uschar *) * (count + 1));
3471     for (p = USS environ; *p != NULL; p++)
3472       {
3473       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3474       *newp++ = *p;
3475       }
3476     if (timezone_string != NULL)
3477       {
3478       *newp = malloc(Ustrlen(timezone_string) + 4);
3479       sprintf(CS *newp++, "TZ=%s", timezone_string);
3480       }
3481     *newp = NULL;
3482     environ = CSS new;
3483     tzset();
3484     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3485       tod_stamp(tod_log));
3486     }
3487   }
3488
3489 /* Handle the case when we have removed the setuid privilege because of -C or
3490 -D. This means that the caller of Exim was not root.
3491
3492 There is a problem if we were running as the Exim user. The sysadmin may
3493 expect this case to retain privilege because "the binary was called by the
3494 Exim user", but it hasn't, because either the -D option set macros, or the
3495 -C option set a non-trusted configuration file. There are two possibilities:
3496
3497   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3498       to do message deliveries. Thus, the fact that it is running as a
3499       non-privileged user is plausible, and might be wanted in some special
3500       configurations. However, really_exim will have been set false when
3501       privilege was dropped, to stop Exim trying to write to its normal log
3502       files. Therefore, re-enable normal log processing, assuming the sysadmin
3503       has set up the log directory correctly.
3504
3505   (2) If deliver_drop_privilege is not set, the configuration won't work as
3506       apparently intended, and so we log a panic message. In order to retain
3507       root for -C or -D, the caller must either be root or be invoking a
3508       trusted configuration file (when deliver_drop_privilege is false). */
3509
3510 if (removed_privilege && (!trusted_config || macros != NULL) &&
3511     real_uid == exim_uid)
3512   {
3513   if (deliver_drop_privilege)
3514     really_exim = TRUE; /* let logging work normally */
3515   else
3516     log_write(0, LOG_MAIN|LOG_PANIC,
3517       "exim user lost privilege for using %s option",
3518       trusted_config? "-D" : "-C");
3519   }
3520
3521 /* Start up Perl interpreter if Perl support is configured and there is a
3522 perl_startup option, and the configuration or the command line specifies
3523 initializing starting. Note that the global variables are actually called
3524 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3525
3526 #ifdef EXIM_PERL
3527 if (perl_start_option != 0)
3528   opt_perl_at_start = (perl_start_option > 0);
3529 if (opt_perl_at_start && opt_perl_startup != NULL)
3530   {
3531   uschar *errstr;
3532   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3533   errstr = init_perl(opt_perl_startup);
3534   if (errstr != NULL)
3535     {
3536     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3537     return EXIT_FAILURE;
3538     }
3539   opt_perl_started = TRUE;
3540   }
3541 #endif /* EXIM_PERL */
3542
3543 /* Initialise lookup_list
3544 If debugging, already called above via version reporting.
3545 This does mean that debugging causes the list to be initialised while root.
3546 This *should* be harmless -- all modules are loaded from a fixed dir and
3547 it's code that would, if not a module, be part of Exim already. */
3548 init_lookup_list();
3549
3550 /* Log the arguments of the call if the configuration file said so. This is
3551 a debugging feature for finding out what arguments certain MUAs actually use.
3552 Don't attempt it if logging is disabled, or if listing variables or if
3553 verifying/testing addresses or expansions. */
3554
3555 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3556       && really_exim && !list_options && !checking)
3557   {
3558   int i;
3559   uschar *p = big_buffer;
3560   Ustrcpy(p, "cwd=");
3561   (void)getcwd(CS p+4, big_buffer_size - 4);
3562   while (*p) p++;
3563   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3564   while (*p) p++;
3565   for (i = 0; i < argc; i++)
3566     {
3567     int len = Ustrlen(argv[i]);
3568     uschar *printing;
3569     uschar *quote;
3570     if (p + len + 8 >= big_buffer + big_buffer_size)
3571       {
3572       Ustrcpy(p, " ...");
3573       log_write(0, LOG_MAIN, "%s", big_buffer);
3574       Ustrcpy(big_buffer, "...");
3575       p = big_buffer + 3;
3576       }
3577     printing = string_printing(argv[i]);
3578     if (printing[0] == 0) quote = US"\""; else
3579       {
3580       uschar *pp = printing;
3581       quote = US"";
3582       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3583       }
3584     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3585       (p - big_buffer) - 4), printing, quote);
3586     while (*p) p++;
3587     }
3588
3589   if ((log_extra_selector & LX_arguments) != 0)
3590     log_write(0, LOG_MAIN, "%s", big_buffer);
3591   else
3592     debug_printf("%s\n", big_buffer);
3593   }
3594
3595 /* Set the working directory to be the top-level spool directory. We don't rely
3596 on this in the code, which always uses fully qualified names, but it's useful
3597 for core dumps etc. Don't complain if it fails - the spool directory might not
3598 be generally accessible and calls with the -C option (and others) have lost
3599 privilege by now. Before the chdir, we try to ensure that the directory exists.
3600 */
3601
3602 if (Uchdir(spool_directory) != 0)
3603   {
3604   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3605   (void)Uchdir(spool_directory);
3606   }
3607
3608 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3609 alias file. Exim doesn't have such a concept, but this call is screwed into
3610 Sun's YP makefiles. Handle this by calling a configured script, as the real
3611 user who called Exim. The -oA option can be used to pass an argument to the
3612 script. */
3613
3614 if (bi_option)
3615   {
3616   (void)fclose(config_file);
3617   if (bi_command != NULL)
3618     {
3619     int i = 0;
3620     uschar *argv[3];
3621     argv[i++] = bi_command;
3622     if (alias_arg != NULL) argv[i++] = alias_arg;
3623     argv[i++] = NULL;
3624
3625     setgroups(group_count, group_list);
3626     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3627
3628     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3629       (argv[1] == NULL)? US"" : argv[1]);
3630
3631     execv(CS argv[0], (char *const *)argv);
3632     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3633     exit(EXIT_FAILURE);
3634     }
3635   else
3636     {
3637     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3638     exit(EXIT_SUCCESS);
3639     }
3640   }
3641
3642 /* If an action on specific messages is requested, or if a daemon or queue
3643 runner is being started, we need to know if Exim was called by an admin user.
3644 This is the case if the real user is root or exim, or if the real group is
3645 exim, or if one of the supplementary groups is exim or a group listed in
3646 admin_groups. We don't fail all message actions immediately if not admin_user,
3647 since some actions can be performed by non-admin users. Instead, set admin_user
3648 for later interrogation. */
3649
3650 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3651   admin_user = TRUE;
3652 else
3653   {
3654   int i, j;
3655   for (i = 0; i < group_count; i++)
3656     {
3657     if (group_list[i] == exim_gid) admin_user = TRUE;
3658     else if (admin_groups != NULL)
3659       {
3660       for (j = 1; j <= (int)(admin_groups[0]); j++)
3661         if (admin_groups[j] == group_list[i])
3662           { admin_user = TRUE; break; }
3663       }
3664     if (admin_user) break;
3665     }
3666   }
3667
3668 /* Another group of privileged users are the trusted users. These are root,
3669 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3670 are permitted to specify sender_addresses with -f on the command line, and
3671 other message parameters as well. */
3672
3673 if (real_uid == root_uid || real_uid == exim_uid)
3674   trusted_caller = TRUE;
3675 else
3676   {
3677   int i, j;
3678
3679   if (trusted_users != NULL)
3680     {
3681     for (i = 1; i <= (int)(trusted_users[0]); i++)
3682       if (trusted_users[i] == real_uid)
3683         { trusted_caller = TRUE; break; }
3684     }
3685
3686   if (!trusted_caller && trusted_groups != NULL)
3687     {
3688     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3689       {
3690       if (trusted_groups[i] == real_gid)
3691         trusted_caller = TRUE;
3692       else for (j = 0; j < group_count; j++)
3693         {
3694         if (trusted_groups[i] == group_list[j])
3695           { trusted_caller = TRUE; break; }
3696         }
3697       if (trusted_caller) break;
3698       }
3699     }
3700   }
3701
3702 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3703 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3704
3705 /* Only an admin user may start the daemon or force a queue run in the default
3706 configuration, but the queue run restriction can be relaxed. Only an admin
3707 user may request that a message be returned to its sender forthwith. Only an
3708 admin user may specify a debug level greater than D_v (because it might show
3709 passwords, etc. in lookup queries). Only an admin user may request a queue
3710 count. Only an admin user can use the test interface to scan for email
3711 (because Exim will be in the spool dir and able to look at mails). */
3712
3713 if (!admin_user)
3714   {
3715   BOOL debugset = (debug_selector & ~D_v) != 0;
3716   if (deliver_give_up || daemon_listen || malware_test_file ||
3717      (count_queue && queue_list_requires_admin) ||
3718      (list_queue && queue_list_requires_admin) ||
3719      (queue_interval >= 0 && prod_requires_admin) ||
3720      (debugset && !running_in_test_harness))
3721     {
3722     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3723     exit(EXIT_FAILURE);
3724     }
3725   }
3726
3727 /* If the real user is not root or the exim uid, the argument for passing
3728 in an open TCP/IP connection for another message is not permitted, nor is
3729 running with the -N option for any delivery action, unless this call to exim is
3730 one that supplied an input message, or we are using a patched exim for
3731 regression testing. */
3732
3733 if (real_uid != root_uid && real_uid != exim_uid &&
3734      (continue_hostname != NULL ||
3735        (dont_deliver &&
3736          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3737        )) && !running_in_test_harness)
3738   {
3739   fprintf(stderr, "exim: Permission denied\n");
3740   return EXIT_FAILURE;
3741   }
3742
3743 /* If the caller is not trusted, certain arguments are ignored when running for
3744 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3745 Note that authority for performing certain actions on messages is tested in the
3746 queue_action() function. */
3747
3748 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3749   {
3750   sender_host_name = sender_host_address = interface_address =
3751     sender_ident = received_protocol = NULL;
3752   sender_host_port = interface_port = 0;
3753   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3754   }
3755
3756 /* If a sender host address is set, extract the optional port number off the
3757 end of it and check its syntax. Do the same thing for the interface address.
3758 Exim exits if the syntax is bad. */
3759
3760 else
3761   {
3762   if (sender_host_address != NULL)
3763     sender_host_port = check_port(sender_host_address);
3764   if (interface_address != NULL)
3765     interface_port = check_port(interface_address);
3766   }
3767
3768 /* If an SMTP message is being received check to see if the standard input is a
3769 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3770 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3771 barf. */
3772
3773 if (smtp_input)
3774   {
3775   union sockaddr_46 inetd_sock;
3776   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3777   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3778     {
3779     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3780     if (family == AF_INET || family == AF_INET6)
3781       {
3782       union sockaddr_46 interface_sock;
3783       size = sizeof(interface_sock);
3784
3785       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3786         interface_address = host_ntoa(-1, &interface_sock, NULL,
3787           &interface_port);
3788
3789       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3790
3791       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3792         {
3793         is_inetd = TRUE;
3794         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3795           NULL, &sender_host_port);
3796         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3797           "inetd is not supported when mua_wrapper is set");
3798         }
3799       else
3800         {
3801         fprintf(stderr,
3802           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3803         return EXIT_FAILURE;
3804         }
3805       }
3806     }
3807   }
3808
3809 /* If the load average is going to be needed while receiving a message, get it
3810 now for those OS that require the first call to os_getloadavg() to be done as
3811 root. There will be further calls later for each message received. */
3812
3813 #ifdef LOAD_AVG_NEEDS_ROOT
3814 if (receiving_message &&
3815       (queue_only_load >= 0 ||
3816         (is_inetd && smtp_load_reserve >= 0)
3817       ))
3818   {
3819   load_average = OS_GETLOADAVG();
3820   }
3821 #endif
3822
3823 /* The queue_only configuration option can be overridden by -odx on the command
3824 line, except that if queue_only_override is false, queue_only cannot be unset
3825 from the command line. */
3826
3827 if (queue_only_set && (queue_only_override || arg_queue_only))
3828   queue_only = arg_queue_only;
3829
3830 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3831 -or and -os. */
3832
3833 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3834 if (arg_smtp_receive_timeout >= 0)
3835   smtp_receive_timeout = arg_smtp_receive_timeout;
3836
3837 /* If Exim was started with root privilege, unless we have already removed the
3838 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3839 except when starting the daemon or doing some kind of delivery or address
3840 testing (-bt). These are the only cases when root need to be retained. We run
3841 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3842 retained only for starting the daemon. We always do the initgroups() in this
3843 situation (controlled by the TRUE below), in order to be as close as possible
3844 to the state Exim usually runs in. */
3845
3846 if (!unprivileged &&                      /* originally had root AND */
3847     !removed_privilege &&                 /* still got root AND      */
3848     !daemon_listen &&                     /* not starting the daemon */
3849     queue_interval <= 0 &&                /* (either kind of daemon) */
3850       (                                   /*    AND EITHER           */
3851       deliver_drop_privilege ||           /* requested unprivileged  */
3852         (                                 /*       OR                */
3853         queue_interval < 0 &&             /* not running the queue   */
3854         (msg_action_arg < 0 ||            /*       and               */
3855           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3856         (!checking || !address_test_mode) /* not address checking    */
3857         )
3858       ))
3859   {
3860   exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3861   }
3862
3863 /* When we are retaining a privileged uid, we still change to the exim gid. */
3864
3865 else setgid(exim_gid);
3866
3867 /* Handle a request to scan a file for malware */
3868 if (malware_test_file)
3869   {
3870 #ifdef WITH_CONTENT_SCAN
3871   int result;
3872   set_process_info("scanning file for malware");
3873   result = malware_in_file(malware_test_file);
3874   if (result == FAIL)
3875     {
3876     printf("No malware found.\n");
3877     exit(EXIT_SUCCESS);
3878     }
3879   if (result != OK)
3880     {
3881     printf("Malware lookup returned non-okay/fail: %d\n", result);
3882     exit(EXIT_FAILURE);
3883     }
3884   if (malware_name)
3885     printf("Malware found: %s\n", malware_name);
3886   else
3887     printf("Malware scan detected malware of unknown name.\n");
3888 #else
3889   printf("Malware scanning not enabled at compile time.\n");
3890 #endif
3891   exit(EXIT_FAILURE);
3892   }
3893
3894 /* Handle a request to list the delivery queue */
3895
3896 if (list_queue)
3897   {
3898   set_process_info("listing the queue");
3899   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3900   exit(EXIT_SUCCESS);
3901   }
3902
3903 /* Handle a request to count the delivery queue */
3904
3905 if (count_queue)
3906   {
3907   set_process_info("counting the queue");
3908   queue_count();
3909   exit(EXIT_SUCCESS);
3910   }
3911
3912 /* Handle actions on specific messages, except for the force delivery and
3913 message load actions, which are done below. Some actions take a whole list of
3914 message ids, which are known to continue up to the end of the arguments. Others
3915 take a single message id and then operate on the recipients list. */
3916
3917 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3918   {
3919   int yield = EXIT_SUCCESS;
3920   set_process_info("acting on specified messages");
3921
3922   if (!one_msg_action)
3923     {
3924     for (i = msg_action_arg; i < argc; i++)
3925       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3926         yield = EXIT_FAILURE;
3927     }
3928
3929   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3930     recipients_arg)) yield = EXIT_FAILURE;
3931   exit(yield);
3932   }
3933
3934 /* All the modes below here require the remaining configuration sections
3935 to be read, except that we can skip over the ACL setting when delivering
3936 specific messages, or doing a queue run. (For various testing cases we could
3937 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3938 for skipping. */
3939
3940 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3941
3942 /* The configuration data will have been read into POOL_PERM because we won't
3943 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3944 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3945 configuration were read into POOL_MAIN, because we don't do any resets till
3946 later on. However, it seems right, and it does ensure that both pools get used.
3947 */
3948
3949 store_pool = POOL_MAIN;
3950
3951 /* Handle the -brt option. This is for checking out retry configurations.
3952 The next three arguments are a domain name or a complete address, and
3953 optionally two error numbers. All it does is to call the function that
3954 scans the retry configuration data. */
3955
3956 if (test_retry_arg >= 0)
3957   {
3958   retry_config *yield;
3959   int basic_errno = 0;
3960   int more_errno = 0;
3961   uschar *s1, *s2;
3962
3963   if (test_retry_arg >= argc)
3964     {
3965     printf("-brt needs a domain or address argument\n");
3966     exim_exit(EXIT_FAILURE);
3967     }
3968   s1 = argv[test_retry_arg++];
3969   s2 = NULL;
3970
3971   /* If the first argument contains no @ and no . it might be a local user
3972   or it might be a single-component name. Treat as a domain. */
3973
3974   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3975     {
3976     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3977       "being \ntreated as a one-component domain, not as a local part.\n\n",
3978       s1);
3979     }
3980
3981   /* There may be an optional second domain arg. */
3982
3983   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3984     s2 = argv[test_retry_arg++];
3985
3986   /* The final arg is an error name */
3987
3988   if (test_retry_arg < argc)
3989     {
3990     uschar *ss = argv[test_retry_arg];
3991     uschar *error =
3992       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3993     if (error != NULL)
3994       {
3995       printf("%s\n", CS error);
3996       return EXIT_FAILURE;
3997       }
3998
3999     /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4000     code > 100 as an error is for matching codes to the decade. Turn them into
4001     a real error code, off the decade. */
4002
4003     if (basic_errno == ERRNO_MAIL4XX ||
4004         basic_errno == ERRNO_RCPT4XX ||
4005         basic_errno == ERRNO_DATA4XX)
4006       {
4007       int code = (more_errno >> 8) & 255;
4008       if (code == 255)
4009         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4010       else if (code > 100)
4011         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4012       }
4013     }
4014
4015   yield = retry_find_config(s1, s2, basic_errno, more_errno);
4016   if (yield == NULL) printf("No retry information found\n"); else
4017     {
4018     retry_rule *r;
4019     more_errno = yield->more_errno;
4020     printf("Retry rule: %s  ", yield->pattern);
4021
4022     if (yield->basic_errno == ERRNO_EXIMQUOTA)
4023       {
4024       printf("quota%s%s  ",
4025         (more_errno > 0)? "_" : "",
4026         (more_errno > 0)? readconf_printtime(more_errno) : US"");
4027       }
4028     else if (yield->basic_errno == ECONNREFUSED)
4029       {
4030       printf("refused%s%s  ",
4031         (more_errno > 0)? "_" : "",
4032         (more_errno == 'M')? "MX" :
4033         (more_errno == 'A')? "A" : "");
4034       }
4035     else if (yield->basic_errno == ETIMEDOUT)
4036       {
4037       printf("timeout");
4038       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4039       more_errno &= 255;
4040       if (more_errno != 0) printf("_%s",
4041         (more_errno == 'M')? "MX" : "A");
4042       printf("  ");
4043       }
4044     else if (yield->basic_errno == ERRNO_AUTHFAIL)
4045       printf("auth_failed  ");
4046     else printf("*  ");
4047
4048     for (r = yield->rules; r != NULL; r = r->next)
4049       {
4050       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4051       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
4052       if (r->rule == 'G')
4053         {
4054         int x = r->p2;
4055         int f = x % 1000;
4056         int d = 100;
4057         printf(",%d.", x/1000);
4058         do
4059           {
4060           printf("%d", f/d);
4061           f %= d;
4062           d /= 10;
4063           }
4064         while (f != 0);
4065         }
4066       printf("; ");
4067       }
4068
4069     printf("\n");
4070     }
4071   exim_exit(EXIT_SUCCESS);
4072   }
4073
4074 /* Handle a request to list one or more configuration options */
4075
4076 if (list_options)
4077   {
4078   set_process_info("listing variables");
4079   if (recipients_arg >= argc) readconf_print(US"all", NULL);
4080     else for (i = recipients_arg; i < argc; i++)
4081       {
4082       if (i < argc - 1 &&
4083           (Ustrcmp(argv[i], "router") == 0 ||
4084            Ustrcmp(argv[i], "transport") == 0 ||
4085            Ustrcmp(argv[i], "authenticator") == 0 ||
4086            Ustrcmp(argv[i], "macro") == 0))
4087         {
4088         readconf_print(argv[i+1], argv[i]);
4089         i++;
4090         }
4091       else readconf_print(argv[i], NULL);
4092       }
4093   exim_exit(EXIT_SUCCESS);
4094   }
4095
4096
4097 /* Handle a request to deliver one or more messages that are already on the
4098 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4099 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4100
4101 Delivery of specific messages is typically used for a small number when
4102 prodding by hand (when the option forced_delivery will be set) or when
4103 re-execing to regain root privilege. Each message delivery must happen in a
4104 separate process, so we fork a process for each one, and run them sequentially
4105 so that debugging output doesn't get intertwined, and to avoid spawning too
4106 many processes if a long list is given. However, don't fork for the last one;
4107 this saves a process in the common case when Exim is called to deliver just one
4108 message. */
4109
4110 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4111   {
4112   if (prod_requires_admin && !admin_user)
4113     {
4114     fprintf(stderr, "exim: Permission denied\n");
4115     exim_exit(EXIT_FAILURE);
4116     }
4117   set_process_info("delivering specified messages");
4118   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4119   for (i = msg_action_arg; i < argc; i++)
4120     {
4121     int status;
4122     pid_t pid;
4123     if (i == argc - 1)
4124       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4125     else if ((pid = fork()) == 0)
4126       {
4127       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4128       _exit(EXIT_SUCCESS);
4129       }
4130     else if (pid < 0)
4131       {
4132       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4133         strerror(errno));
4134       exim_exit(EXIT_FAILURE);
4135       }
4136     else wait(&status);
4137     }
4138   exim_exit(EXIT_SUCCESS);
4139   }
4140
4141
4142 /* If only a single queue run is requested, without SMTP listening, we can just
4143 turn into a queue runner, with an optional starting message id. */
4144
4145 if (queue_interval == 0 && !daemon_listen)
4146   {
4147   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4148     (start_queue_run_id == NULL)? US"" : US" starting at ",
4149     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4150     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
4151     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
4152   set_process_info("running the queue (single queue run)");
4153   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4154   exim_exit(EXIT_SUCCESS);
4155   }
4156
4157
4158 /* Find the login name of the real user running this process. This is always
4159 needed when receiving a message, because it is written into the spool file. It
4160 may also be used to construct a from: or a sender: header, and in this case we
4161 need the user's full name as well, so save a copy of it, checked for RFC822
4162 syntax and munged if necessary, if it hasn't previously been set by the -F
4163 argument. We may try to get the passwd entry more than once, in case NIS or
4164 other delays are in evidence. Save the home directory for use in filter testing
4165 (only). */
4166
4167 for (i = 0;;)
4168   {
4169   if ((pw = getpwuid(real_uid)) != NULL)
4170     {
4171     originator_login = string_copy(US pw->pw_name);
4172     originator_home = string_copy(US pw->pw_dir);
4173
4174     /* If user name has not been set by -F, set it from the passwd entry
4175     unless -f has been used to set the sender address by a trusted user. */
4176
4177     if (originator_name == NULL)
4178       {
4179       if (sender_address == NULL ||
4180            (!trusted_caller && filter_test == FTEST_NONE))
4181         {
4182         uschar *name = US pw->pw_gecos;
4183         uschar *amp = Ustrchr(name, '&');
4184         uschar buffer[256];
4185
4186         /* Most Unix specify that a '&' character in the gecos field is
4187         replaced by a copy of the login name, and some even specify that
4188         the first character should be upper cased, so that's what we do. */
4189
4190         if (amp != NULL)
4191           {
4192           int loffset;
4193           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4194             amp - name, name, &loffset, originator_login, amp + 1);
4195           buffer[loffset] = toupper(buffer[loffset]);
4196           name = buffer;
4197           }
4198
4199         /* If a pattern for matching the gecos field was supplied, apply
4200         it and then expand the name string. */
4201
4202         if (gecos_pattern != NULL && gecos_name != NULL)
4203           {
4204           const pcre *re;
4205           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4206
4207           if (regex_match_and_setup(re, name, 0, -1))
4208             {
4209             uschar *new_name = expand_string(gecos_name);
4210             expand_nmax = -1;
4211             if (new_name != NULL)
4212               {
4213               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4214                 "gecos field \"%s\"\n", new_name, name);
4215               name = new_name;
4216               }
4217             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4218               "\"%s\": %s\n", gecos_name, expand_string_message);
4219             }
4220           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4221             "gecos field \"%s\"\n", gecos_pattern, name);
4222           store_free((void *)re);
4223           }
4224         originator_name = string_copy(name);
4225         }
4226
4227       /* A trusted caller has used -f but not -F */
4228
4229       else originator_name = US"";
4230       }
4231
4232     /* Break the retry loop */
4233
4234     break;
4235     }
4236
4237   if (++i > finduser_retries) break;
4238   sleep(1);
4239   }
4240
4241 /* If we cannot get a user login, log the incident and give up, unless the
4242 configuration specifies something to use. When running in the test harness,
4243 any setting of unknown_login overrides the actual name. */
4244
4245 if (originator_login == NULL || running_in_test_harness)
4246   {
4247   if (unknown_login != NULL)
4248     {
4249     originator_login = expand_string(unknown_login);
4250     if (originator_name == NULL && unknown_username != NULL)
4251       originator_name = expand_string(unknown_username);
4252     if (originator_name == NULL) originator_name = US"";
4253     }
4254   if (originator_login == NULL)
4255     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4256       (int)real_uid);
4257   }
4258
4259 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4260 RFC822 address.*/
4261
4262 originator_name = string_copy(parse_fix_phrase(originator_name,
4263   Ustrlen(originator_name), big_buffer, big_buffer_size));
4264
4265 /* If a message is created by this call of Exim, the uid/gid of its originator
4266 are those of the caller. These values are overridden if an existing message is
4267 read in from the spool. */
4268
4269 originator_uid = real_uid;
4270 originator_gid = real_gid;
4271
4272 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4273   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4274
4275 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4276 returns. We leave this till here so that the originator_ fields are available
4277 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4278 mode. */
4279
4280 if (daemon_listen || queue_interval > 0)
4281   {
4282   if (mua_wrapper)
4283     {
4284     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4285     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4286       "mua_wrapper is set");
4287     }
4288   daemon_go();
4289   }
4290
4291 /* If the sender ident has not been set (by a trusted caller) set it to
4292 the caller. This will get overwritten below for an inetd call. If a trusted
4293 caller has set it empty, unset it. */
4294
4295 if (sender_ident == NULL) sender_ident = originator_login;
4296   else if (sender_ident[0] == 0) sender_ident = NULL;
4297
4298 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4299 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4300 originator_* variables set. */
4301
4302 if (test_rewrite_arg >= 0)
4303   {
4304   really_exim = FALSE;
4305   if (test_rewrite_arg >= argc)
4306     {
4307     printf("-brw needs an address argument\n");
4308     exim_exit(EXIT_FAILURE);
4309     }
4310   rewrite_test(argv[test_rewrite_arg]);
4311   exim_exit(EXIT_SUCCESS);
4312   }
4313
4314 /* A locally-supplied message is considered to be coming from a local user
4315 unless a trusted caller supplies a sender address with -f, or is passing in the
4316 message via SMTP (inetd invocation or otherwise). */
4317
4318 if ((sender_address == NULL && !smtp_input) ||
4319     (!trusted_caller && filter_test == FTEST_NONE))
4320   {
4321   sender_local = TRUE;
4322
4323   /* A trusted caller can supply authenticated_sender and authenticated_id
4324   via -oMas and -oMai and if so, they will already be set. Otherwise, force
4325   defaults except when host checking. */
4326
4327   if (authenticated_sender == NULL && !host_checking)
4328     authenticated_sender = string_sprintf("%s@%s", originator_login,
4329       qualify_domain_sender);
4330   if (authenticated_id == NULL && !host_checking)
4331     authenticated_id = originator_login;
4332   }
4333
4334 /* Trusted callers are always permitted to specify the sender address.
4335 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4336 is specified is the empty address. However, if a trusted caller does not
4337 specify a sender address for SMTP input, we leave sender_address unset. This
4338 causes the MAIL commands to be honoured. */
4339
4340 if ((!smtp_input && sender_address == NULL) ||
4341     !receive_check_set_sender(sender_address))
4342   {
4343   /* Either the caller is not permitted to set a general sender, or this is
4344   non-SMTP input and the trusted caller has not set a sender. If there is no
4345   sender, or if a sender other than <> is set, override with the originator's
4346   login (which will get qualified below), except when checking things. */
4347
4348   if (sender_address == NULL             /* No sender_address set */
4349        ||                                /*         OR            */
4350        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4351        !checking &&                      /* Not running tests, AND */
4352        filter_test == FTEST_NONE))       /* Not testing a filter */
4353     {
4354     sender_address = originator_login;
4355     sender_address_forced = FALSE;
4356     sender_address_domain = 0;
4357     }
4358   }
4359
4360 /* Remember whether an untrusted caller set the sender address */
4361
4362 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4363
4364 /* Ensure that the sender address is fully qualified unless it is the empty
4365 address, which indicates an error message, or doesn't exist (root caller, smtp
4366 interface, no -f argument). */
4367
4368 if (sender_address != NULL && sender_address[0] != 0 &&
4369     sender_address_domain == 0)
4370   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4371     qualify_domain_sender);
4372
4373 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4374
4375 /* Handle a request to verify a list of addresses, or test them for delivery.
4376 This must follow the setting of the sender address, since routers can be
4377 predicated upon the sender. If no arguments are given, read addresses from
4378 stdin. Set debug_level to at least D_v to get full output for address testing.
4379 */
4380
4381 if (verify_address_mode || address_test_mode)
4382   {
4383   int exit_value = 0;
4384   int flags = vopt_qualify;
4385
4386   if (verify_address_mode)
4387     {
4388     if (!verify_as_sender) flags |= vopt_is_recipient;
4389     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4390     }
4391
4392   else
4393     {
4394     flags |= vopt_is_recipient;
4395     debug_selector |= D_v;
4396     debug_file = stderr;
4397     debug_fd = fileno(debug_file);
4398     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4399     }
4400
4401   if (recipients_arg < argc)
4402     {
4403     while (recipients_arg < argc)
4404       {
4405       uschar *s = argv[recipients_arg++];
4406       while (*s != 0)
4407         {
4408         BOOL finished = FALSE;
4409         uschar *ss = parse_find_address_end(s, FALSE);
4410         if (*ss == ',') *ss = 0; else finished = TRUE;
4411         test_address(s, flags, &exit_value);
4412         s = ss;
4413         if (!finished)
4414           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4415         }
4416       }
4417     }
4418
4419   else for (;;)
4420     {
4421     uschar *s = get_stdinput(NULL, NULL);
4422     if (s == NULL) break;
4423     test_address(s, flags, &exit_value);
4424     }
4425
4426   route_tidyup();
4427   exim_exit(exit_value);
4428   }
4429
4430 /* Handle expansion checking. Either expand items on the command line, or read
4431 from stdin if there aren't any. If -Mset was specified, load the message so
4432 that its variables can be used, but restrict this facility to admin users.
4433 Otherwise, if -bem was used, read a message from stdin. */
4434
4435 if (expansion_test)
4436   {
4437   if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4438     {
4439     uschar spoolname[256];  /* Not big_buffer; used in spool_read_header() */
4440     if (!admin_user)
4441       {
4442       fprintf(stderr, "exim: permission denied\n");
4443       exit(EXIT_FAILURE);
4444       }
4445     message_id = argv[msg_action_arg];
4446     (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4447     if (!spool_open_datafile(message_id))
4448       printf ("Failed to load message datafile %s\n", message_id);
4449     if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4450       printf ("Failed to load message %s\n", message_id);
4451     }
4452
4453   /* Read a test message from a file. We fudge it up to be on stdin, saving
4454   stdin itself for later reading of expansion strings. */
4455
4456   else if (expansion_test_message != NULL)
4457     {
4458     int save_stdin = dup(0);
4459     int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4460     if (fd < 0)
4461       {
4462       fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4463         strerror(errno));
4464       return EXIT_FAILURE;
4465       }
4466     (void) dup2(fd, 0);
4467     filter_test = FTEST_USER;      /* Fudge to make it look like filter test */
4468     message_ended = END_NOTENDED;
4469     read_message_body(receive_msg(extract_recipients));
4470     message_linecount += body_linecount;
4471     (void)dup2(save_stdin, 0);
4472     (void)close(save_stdin);
4473     clearerr(stdin);               /* Required by Darwin */
4474     }
4475
4476   /* Allow $recipients for this testing */
4477
4478   enable_dollar_recipients = TRUE;
4479
4480   /* Expand command line items */
4481
4482   if (recipients_arg < argc)
4483     {
4484     while (recipients_arg < argc)
4485       {
4486       uschar *s = argv[recipients_arg++];
4487       uschar *ss = expand_string(s);
4488       if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4489       else printf("%s\n", CS ss);
4490       }
4491     }
4492
4493   /* Read stdin */
4494
4495   else
4496     {
4497     char *(*fn_readline)(char *) = NULL;
4498     char *(*fn_addhist)(char *) = NULL;
4499
4500     #ifdef USE_READLINE
4501     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4502     #endif
4503
4504     for (;;)
4505       {
4506       uschar *ss;
4507       uschar *source = get_stdinput(fn_readline, fn_addhist);
4508       if (source == NULL) break;
4509       ss = expand_string(source);
4510       if (ss == NULL)
4511         printf ("Failed: %s\n", expand_string_message);
4512       else printf("%s\n", CS ss);
4513       }
4514
4515     #ifdef USE_READLINE
4516     if (dlhandle != NULL) dlclose(dlhandle);
4517     #endif
4518     }
4519
4520   /* The data file will be open after -Mset */
4521
4522   if (deliver_datafile >= 0)
4523     {
4524     (void)close(deliver_datafile);
4525     deliver_datafile = -1;
4526     }
4527
4528   exim_exit(EXIT_SUCCESS);
4529   }
4530
4531
4532 /* The active host name is normally the primary host name, but it can be varied
4533 for hosts that want to play several parts at once. We need to ensure that it is
4534 set for host checking, and for receiving messages. */
4535
4536 smtp_active_hostname = primary_hostname;
4537 if (raw_active_hostname != NULL)
4538   {
4539   uschar *nah = expand_string(raw_active_hostname);
4540   if (nah == NULL)
4541     {
4542     if (!expand_string_forcedfail)
4543       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4544         "(smtp_active_hostname): %s", raw_active_hostname,
4545         expand_string_message);
4546     }
4547   else if (nah[0] != 0) smtp_active_hostname = nah;
4548   }
4549
4550 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4551 given IP address so that the blocking and relay configuration can be tested.
4552 Unless a sender_ident was set by -oMt, we discard it (the default is the
4553 caller's login name). An RFC 1413 call is made only if we are running in the
4554 test harness and an incoming interface and both ports are specified, because
4555 there is no TCP/IP call to find the ident for. */
4556
4557 if (host_checking)
4558   {
4559   int x[4];
4560   int size;
4561
4562   if (!sender_ident_set)
4563     {
4564     sender_ident = NULL;
4565     if (running_in_test_harness && sender_host_port != 0 &&
4566         interface_address != NULL && interface_port != 0)
4567       verify_get_ident(1413);
4568     }
4569
4570   /* In case the given address is a non-canonical IPv6 address, canonicize
4571   it. The code works for both IPv4 and IPv6, as it happens. */
4572
4573   size = host_aton(sender_host_address, x);
4574   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4575   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4576
4577   /* Now set up for testing */
4578
4579   host_build_sender_fullhost();
4580   smtp_input = TRUE;
4581   smtp_in = stdin;
4582   smtp_out = stdout;
4583   sender_local = FALSE;
4584   sender_host_notsocket = TRUE;
4585   debug_file = stderr;
4586   debug_fd = fileno(debug_file);
4587   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4588     "**** but without any ident (RFC 1413) callback.\n"
4589     "**** This is not for real!\n\n",
4590       sender_host_address);
4591
4592   if (verify_check_host(&hosts_connection_nolog) == OK)
4593     log_write_selector &= ~L_smtp_connection;
4594   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4595
4596   /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4597   because a log line has already been written for all its failure exists
4598   (usually "connection refused: <reason>") and writing another one is
4599   unnecessary clutter. */
4600
4601   if (smtp_start_session())
4602     {
4603     reset_point = store_get(0);
4604     for (;;)
4605       {
4606       store_reset(reset_point);
4607       if (smtp_setup_msg() <= 0) break;
4608       if (!receive_msg(FALSE)) break;
4609       }
4610     smtp_log_no_mail();
4611     }
4612   exim_exit(EXIT_SUCCESS);
4613   }
4614
4615
4616 /* Arrange for message reception if recipients or SMTP were specified;
4617 otherwise complain unless a version print (-bV) happened or this is a filter
4618 verification test. In the former case, show the configuration file name. */
4619
4620 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4621   {
4622   if (version_printed)
4623     {
4624     printf("Configuration file is %s\n", config_main_filename);
4625     return EXIT_SUCCESS;
4626     }
4627
4628   if (filter_test == FTEST_NONE)
4629     exim_usage(called_as);
4630   }
4631
4632
4633 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4634 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4635 that we are not called from inetd, because that is rejected above. The
4636 following configuration settings are forced here:
4637
4638   (1) Synchronous delivery (-odi)
4639   (2) Errors to stderr (-oep == -oeq)
4640   (3) No parallel remote delivery
4641   (4) Unprivileged delivery
4642
4643 We don't force overall queueing options because there are several of them;
4644 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4645 to override any SMTP queueing. */
4646
4647 if (mua_wrapper)
4648   {
4649   synchronous_delivery = TRUE;
4650   arg_error_handling = ERRORS_STDERR;
4651   remote_max_parallel = 1;
4652   deliver_drop_privilege = TRUE;
4653   queue_smtp = FALSE;
4654   queue_smtp_domains = NULL;
4655   }
4656
4657
4658 /* Prepare to accept one or more new messages on the standard input. When a
4659 message has been read, its id is returned in message_id[]. If doing immediate
4660 delivery, we fork a delivery process for each received message, except for the
4661 last one, where we can save a process switch.
4662
4663 It is only in non-smtp mode that error_handling is allowed to be changed from
4664 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4665 sendmail error modes other than -oem ever actually used? Later: yes.) */
4666
4667 if (!smtp_input) error_handling = arg_error_handling;
4668
4669 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4670 logging being sent down the socket and make an identd call to get the
4671 sender_ident. */
4672
4673 else if (is_inetd)
4674   {
4675   (void)fclose(stderr);
4676   exim_nullstd();                       /* Re-open to /dev/null */
4677   verify_get_ident(IDENT_PORT);
4678   host_build_sender_fullhost();
4679   set_process_info("handling incoming connection from %s via inetd",
4680     sender_fullhost);
4681   }
4682
4683 /* If the sender host address has been set, build sender_fullhost if it hasn't
4684 already been done (which it will have been for inetd). This caters for the
4685 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4686 so that the test for IP options is skipped for -bs input. */
4687
4688 if (sender_host_address != NULL && sender_fullhost == NULL)
4689   {
4690   host_build_sender_fullhost();
4691   set_process_info("handling incoming connection from %s via -oMa",
4692     sender_fullhost);
4693   sender_host_notsocket = TRUE;
4694   }
4695
4696 /* Otherwise, set the sender host as unknown except for inetd calls. This
4697 prevents host checking in the case of -bs not from inetd and also for -bS. */
4698
4699 else if (!is_inetd) sender_host_unknown = TRUE;
4700
4701 /* If stdout does not exist, then dup stdin to stdout. This can happen
4702 if exim is started from inetd. In this case fd 0 will be set to the socket,
4703 but fd 1 will not be set. This also happens for passed SMTP channels. */
4704
4705 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4706
4707 /* Set up the incoming protocol name and the state of the program. Root is
4708 allowed to force received protocol via the -oMr option above. If we have come
4709 via inetd, the process info has already been set up. We don't set
4710 received_protocol here for smtp input, as it varies according to
4711 batch/HELO/EHLO/AUTH/TLS. */
4712
4713 if (smtp_input)
4714   {
4715   if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4716     smtp_batched_input? "batched " : "",
4717     (sender_address!= NULL)? sender_address : originator_login);
4718   }
4719 else
4720   {
4721   if (received_protocol == NULL)
4722     received_protocol = string_sprintf("local%s", called_as);
4723   set_process_info("accepting a local non-SMTP message from <%s>",
4724     sender_address);
4725   }
4726
4727 /* Initialize the session_local_queue-only flag (this will be ignored if
4728 mua_wrapper is set) */
4729
4730 queue_check_only();
4731 session_local_queue_only = queue_only;
4732
4733 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4734 the spool if so configured. On failure, we must not attempt to send an error
4735 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4736 error code is given.) */
4737
4738 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4739   {
4740   fprintf(stderr, "exim: insufficient disk space\n");
4741   return EXIT_FAILURE;
4742   }
4743
4744 /* If this is smtp input of any kind, real or batched, handle the start of the
4745 SMTP session.
4746
4747 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4748 because a log line has already been written for all its failure exists
4749 (usually "connection refused: <reason>") and writing another one is
4750 unnecessary clutter. */
4751
4752 if (smtp_input)
4753   {
4754   smtp_in = stdin;
4755   smtp_out = stdout;
4756   if (verify_check_host(&hosts_connection_nolog) == OK)
4757     log_write_selector &= ~L_smtp_connection;
4758   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4759   if (!smtp_start_session())
4760     {
4761     mac_smtp_fflush();
4762     exim_exit(EXIT_SUCCESS);
4763     }
4764   }
4765
4766 /* Otherwise, set up the input size limit here. */
4767
4768 else
4769   {
4770   thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4771   if (expand_string_message != NULL)
4772     {
4773     if (thismessage_size_limit == -1)
4774       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4775         "message_size_limit: %s", expand_string_message);
4776     else
4777       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4778         "message_size_limit: %s", expand_string_message);
4779     }
4780   }
4781
4782 /* Loop for several messages when reading SMTP input. If we fork any child
4783 processes, we don't want to wait for them unless synchronous delivery is
4784 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4785 same as SIG_DFL, despite the fact that documentation often lists the default as
4786 "ignore". This is a confusing area. This is what I know:
4787
4788 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4789 processes that complete simply to go away without ever becoming defunct. You
4790 can't then wait for them - but we don't want to wait for them in the
4791 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4792 happen for all OS (e.g. *BSD is different).
4793
4794 But that's not the end of the story. Some (many? all?) systems have the
4795 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4796 has by default, so it seems that the difference is merely one of default
4797 (compare restarting vs non-restarting signals).
4798
4799 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4800 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4801 of the loop below. Paranoia rules.
4802
4803 February 2003: That's *still* not the end of the story. There are now versions
4804 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4805 process then calls waitpid(), a grumble is written to the system log, because
4806 this is logically inconsistent. In other words, it doesn't like the paranoia.
4807 As a consequenc of this, the waitpid() below is now excluded if we are sure
4808 that SIG_IGN works. */
4809
4810 if (!synchronous_delivery)
4811   {
4812   #ifdef SA_NOCLDWAIT
4813   struct sigaction act;
4814   act.sa_handler = SIG_IGN;
4815   sigemptyset(&(act.sa_mask));
4816   act.sa_flags = SA_NOCLDWAIT;
4817   sigaction(SIGCHLD, &act, NULL);
4818   #else
4819   signal(SIGCHLD, SIG_IGN);
4820   #endif
4821   }
4822
4823 /* Save the current store pool point, for resetting at the start of
4824 each message, and save the real sender address, if any. */
4825
4826 reset_point = store_get(0);
4827 real_sender_address = sender_address;
4828
4829 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4830 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4831 collapsed). */
4832
4833 while (more)
4834   {
4835   store_reset(reset_point);
4836   message_id[0] = 0;
4837
4838   /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4839   input and build the recipients list, before calling receive_msg() to read the
4840   message proper. Whatever sender address is given in the SMTP transaction is
4841   often ignored for local senders - we use the actual sender, which is normally
4842   either the underlying user running this process or a -f argument provided by
4843   a trusted caller. It is saved in real_sender_address. The test for whether to
4844   accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4845
4846   if (smtp_input)
4847     {
4848     int rc;
4849     if ((rc = smtp_setup_msg()) > 0)
4850       {
4851       if (real_sender_address != NULL &&
4852           !receive_check_set_sender(sender_address))
4853         {
4854         sender_address = raw_sender = real_sender_address;
4855         sender_address_unrewritten = NULL;
4856         }
4857
4858       /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4859       isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4860       the very end. The result of the ACL is ignored (as for other non-SMTP
4861       messages). It is run for its potential side effects. */
4862
4863       if (smtp_batched_input && acl_not_smtp_start != NULL)
4864         {
4865         uschar *user_msg, *log_msg;
4866         enable_dollar_recipients = TRUE;
4867         (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4868           &user_msg, &log_msg);
4869         enable_dollar_recipients = FALSE;
4870         }
4871
4872       /* Now get the data for the message */
4873
4874       more = receive_msg(extract_recipients);
4875       if (message_id[0] == 0)
4876         {
4877         if (more) continue;
4878         smtp_log_no_mail();               /* Log no mail if configured */
4879         exim_exit(EXIT_FAILURE);
4880         }
4881       }
4882     else
4883       {
4884       smtp_log_no_mail();               /* Log no mail if configured */
4885       exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4886       }
4887     }
4888
4889   /* In the non-SMTP case, we have all the information from the command
4890   line, but must process it in case it is in the more general RFC822
4891   format, and in any case, to detect syntax errors. Also, it appears that
4892   the use of comma-separated lists as single arguments is common, so we
4893   had better support them. */
4894
4895   else
4896     {
4897     int i;
4898     int rcount = 0;
4899     int count = argc - recipients_arg;
4900     uschar **list = argv + recipients_arg;
4901
4902     /* These options cannot be changed dynamically for non-SMTP messages */
4903
4904     active_local_sender_retain = local_sender_retain;
4905     active_local_from_check = local_from_check;
4906
4907     /* Save before any rewriting */
4908
4909     raw_sender = string_copy(sender_address);
4910
4911     /* Loop for each argument */
4912
4913     for (i = 0; i < count; i++)
4914       {
4915       int start, end, domain;
4916       uschar *errmess;
4917       uschar *s = list[i];
4918
4919       /* Loop for each comma-separated address */
4920
4921       while (*s != 0)
4922         {
4923         BOOL finished = FALSE;
4924         uschar *recipient;
4925         uschar *ss = parse_find_address_end(s, FALSE);
4926
4927         if (*ss == ',') *ss = 0; else finished = TRUE;
4928
4929         /* Check max recipients - if -t was used, these aren't recipients */
4930
4931         if (recipients_max > 0 && ++rcount > recipients_max &&
4932             !extract_recipients)
4933           {
4934           if (error_handling == ERRORS_STDERR)
4935             {
4936             fprintf(stderr, "exim: too many recipients\n");
4937             exim_exit(EXIT_FAILURE);
4938             }
4939           else
4940             {
4941             return
4942               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4943                 errors_sender_rc : EXIT_FAILURE;
4944             }
4945           }
4946
4947         recipient =
4948           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4949
4950         if (domain == 0 && !allow_unqualified_recipient)
4951           {
4952           recipient = NULL;
4953           errmess = US"unqualified recipient address not allowed";
4954           }
4955
4956         if (recipient == NULL)
4957           {
4958           if (error_handling == ERRORS_STDERR)
4959             {
4960             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4961               string_printing(list[i]), errmess);
4962             exim_exit(EXIT_FAILURE);
4963             }
4964           else
4965             {
4966             error_block eblock;
4967             eblock.next = NULL;
4968             eblock.text1 = string_printing(list[i]);
4969             eblock.text2 = errmess;
4970             return
4971               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4972                 errors_sender_rc : EXIT_FAILURE;
4973             }
4974           }
4975
4976         receive_add_recipient(recipient, -1);
4977         s = ss;
4978         if (!finished)
4979           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4980         }
4981       }
4982
4983     /* Show the recipients when debugging */
4984
4985     DEBUG(D_receive)
4986       {
4987       int i;
4988       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4989       if (recipients_list != NULL)
4990         {
4991         debug_printf("Recipients:\n");
4992         for (i = 0; i < recipients_count; i++)
4993           debug_printf("  %s\n", recipients_list[i].address);
4994         }
4995       }
4996
4997     /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4998     ignored; rejecting here would just add complication, and it can just as
4999     well be done later. Allow $recipients to be visible in the ACL. */
5000
5001     if (acl_not_smtp_start != NULL)
5002       {
5003       uschar *user_msg, *log_msg;
5004       enable_dollar_recipients = TRUE;
5005       (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5006         &user_msg, &log_msg);
5007       enable_dollar_recipients = FALSE;
5008       }
5009
5010     /* Read the data for the message. If filter_test is not FTEST_NONE, this
5011     will just read the headers for the message, and not write anything onto the
5012     spool. */
5013
5014     message_ended = END_NOTENDED;
5015     more = receive_msg(extract_recipients);
5016
5017     /* more is always FALSE here (not SMTP message) when reading a message
5018     for real; when reading the headers of a message for filter testing,
5019     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5020
5021     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5022     }  /* Non-SMTP message reception */
5023
5024   /* If this is a filter testing run, there are headers in store, but
5025   no message on the spool. Run the filtering code in testing mode, setting
5026   the domain to the qualify domain and the local part to the current user,
5027   unless they have been set by options. The prefix and suffix are left unset
5028   unless specified. The the return path is set to to the sender unless it has
5029   already been set from a return-path header in the message. */
5030
5031   if (filter_test != FTEST_NONE)
5032     {
5033     deliver_domain = (ftest_domain != NULL)?
5034       ftest_domain : qualify_domain_recipient;
5035     deliver_domain_orig = deliver_domain;
5036     deliver_localpart = (ftest_localpart != NULL)?
5037       ftest_localpart : originator_login;
5038     deliver_localpart_orig = deliver_localpart;
5039     deliver_localpart_prefix = ftest_prefix;
5040     deliver_localpart_suffix = ftest_suffix;
5041     deliver_home = originator_home;
5042
5043     if (return_path == NULL)
5044       {
5045       printf("Return-path copied from sender\n");
5046       return_path = string_copy(sender_address);
5047       }
5048     else
5049       {
5050       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5051       }
5052     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5053
5054     receive_add_recipient(
5055       string_sprintf("%s%s%s@%s",
5056         (ftest_prefix == NULL)? US"" : ftest_prefix,
5057         deliver_localpart,
5058         (ftest_suffix == NULL)? US"" : ftest_suffix,
5059         deliver_domain), -1);
5060
5061     printf("Recipient   = %s\n", recipients_list[0].address);
5062     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
5063     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
5064
5065     (void)chdir("/");   /* Get away from wherever the user is running this from */
5066
5067     /* Now we run either a system filter test, or a user filter test, or both.
5068     In the latter case, headers added by the system filter will persist and be
5069     available to the user filter. We need to copy the filter variables
5070     explicitly. */
5071
5072     if ((filter_test & FTEST_SYSTEM) != 0)
5073       {
5074       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5075         exim_exit(EXIT_FAILURE);
5076       }
5077
5078     memcpy(filter_sn, filter_n, sizeof(filter_sn));
5079
5080     if ((filter_test & FTEST_USER) != 0)
5081       {
5082       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5083         exim_exit(EXIT_FAILURE);
5084       }
5085
5086     exim_exit(EXIT_SUCCESS);
5087     }
5088
5089   /* Else act on the result of message reception. We should not get here unless
5090   message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5091   will be TRUE. If it is not, check on the number of messages received in this
5092   connection. */
5093
5094   if (!session_local_queue_only &&
5095       smtp_accept_queue_per_connection > 0 &&
5096       receive_messagecount > smtp_accept_queue_per_connection)
5097     {
5098     session_local_queue_only = TRUE;
5099     queue_only_reason = 2;
5100     }
5101
5102   /* Initialize local_queue_only from session_local_queue_only. If it is false,
5103   and queue_only_load is set, check that the load average is below it. If it is
5104   not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5105   default), we put the whole session into queue_only mode. It then remains this
5106   way for any subsequent messages on the same SMTP connection. This is a
5107   deliberate choice; even though the load average may fall, it doesn't seem
5108   right to deliver later messages on the same call when not delivering earlier
5109   ones. However, there are odd cases where this is not wanted, so this can be
5110   changed by setting queue_only_load_latch false. */
5111
5112   local_queue_only = session_local_queue_only;
5113   if (!local_queue_only && queue_only_load >= 0)
5114     {
5115     local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5116     if (local_queue_only)
5117       {
5118       queue_only_reason = 3;
5119       if (queue_only_load_latch) session_local_queue_only = TRUE;
5120       }
5121     }
5122
5123   /* If running as an MUA wrapper, all queueing options and freezing options
5124   are ignored. */
5125
5126   if (mua_wrapper)
5127     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5128
5129   /* Log the queueing here, when it will get a message id attached, but
5130   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5131   connections). */
5132
5133   if (local_queue_only) switch(queue_only_reason)
5134     {
5135     case 2:
5136     log_write(L_delay_delivery,
5137               LOG_MAIN, "no immediate delivery: more than %d messages "
5138       "received in one connection", smtp_accept_queue_per_connection);
5139     break;
5140
5141     case 3:
5142     log_write(L_delay_delivery,
5143               LOG_MAIN, "no immediate delivery: load average %.2f",
5144               (double)load_average/1000.0);
5145     break;
5146     }
5147
5148   /* Else do the delivery unless the ACL or local_scan() called for queue only
5149   or froze the message. Always deliver in a separate process. A fork failure is
5150   not a disaster, as the delivery will eventually happen on a subsequent queue
5151   run. The search cache must be tidied before the fork, as the parent will
5152   do it before exiting. The child will trigger a lookup failure and
5153   thereby defer the delivery if it tries to use (for example) a cached ldap
5154   connection that the parent has called unbind on. */
5155
5156   else if (!queue_only_policy && !deliver_freeze)
5157     {
5158     pid_t pid;
5159     search_tidyup();
5160
5161     if ((pid = fork()) == 0)
5162       {
5163       int rc;
5164       close_unwanted();      /* Close unwanted file descriptors and TLS */
5165       exim_nullstd();        /* Ensure std{in,out,err} exist */
5166
5167       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5168       mode, deliver_drop_privilege is forced TRUE). */
5169
5170       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5171         {
5172         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5173           message_id);
5174         /* Control does not return here. */
5175         }
5176
5177       /* No need to re-exec */
5178
5179       rc = deliver_message(message_id, FALSE, FALSE);
5180       search_tidyup();
5181       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5182         EXIT_SUCCESS : EXIT_FAILURE);
5183       }
5184
5185     if (pid < 0)
5186       {
5187       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5188         "process: %s", strerror(errno));
5189       }
5190
5191     /* In the parent, wait if synchronous delivery is required. This will
5192     always be the case in MUA wrapper mode. */
5193
5194     else if (synchronous_delivery)
5195       {
5196       int status;
5197       while (wait(&status) != pid);
5198       if ((status & 0x00ff) != 0)
5199         log_write(0, LOG_MAIN|LOG_PANIC,
5200           "process %d crashed with signal %d while delivering %s",
5201           (int)pid, status & 0x00ff, message_id);
5202       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5203       }
5204     }
5205
5206   /* The loop will repeat if more is TRUE. If we do not know know that the OS
5207   automatically reaps children (see comments above the loop), clear away any
5208   finished subprocesses here, in case there are lots of messages coming in
5209   from the same source. */
5210
5211   #ifndef SIG_IGN_WORKS
5212   while (waitpid(-1, NULL, WNOHANG) > 0);
5213   #endif
5214   }
5215
5216 exim_exit(EXIT_SUCCESS);   /* Never returns */
5217 return 0;                  /* To stop compiler warning */
5218 }
5219
5220 /* End of exim.c */