src/src/routers/redirect.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* Copyright (c) The Exim Maintainers 2020 */
   7 /* See the file NOTICE for conditions of use and distribution. */
   8
   9
  10 #include "../exim.h"
  11 #include "rf_functions.h"
  12 #include "redirect.h"
  13
  14
  15
  16 /* Options specific to the redirect router. */
  17 #define LOFF(field) OPT_OFF(redirect_router_options_block, field)
  18
  19 optionlist redirect_router_options[] = {
  20   { "allow_defer",        opt_bit | (RDON_DEFER << 16),
  21       LOFF(bit_options) },
  22   { "allow_fail",         opt_bit | (RDON_FAIL << 16),
  23       LOFF(bit_options) },
  24   { "allow_filter",       opt_bit | (RDON_FILTER << 16),
  25       LOFF(bit_options) },
  26   { "allow_freeze",       opt_bit | (RDON_FREEZE << 16),
  27       LOFF(bit_options) },
  28   { "check_ancestor",     opt_bool,             LOFF(check_ancestor) },
  29   { "check_group",        opt_bool,             LOFF(check_group) },
  30   { "check_owner",        opt_bool,             LOFF(check_owner) },
  31   { "data",               opt_stringptr,        LOFF(data) },
  32   { "directory_transport",opt_stringptr,        LOFF(directory_transport_name) },
  33   { "file",               opt_stringptr,        LOFF(file) },
  34   { "file_transport",     opt_stringptr,        LOFF(file_transport_name) },
  35
  36   { "filter_prepend_home",opt_bit | (RDON_PREPEND_HOME << 16),
  37       LOFF(bit_options) },
  38   { "forbid_blackhole",   opt_bit | (RDON_BLACKHOLE << 16),
  39       LOFF(bit_options) },
  40   { "forbid_exim_filter", opt_bit | (RDON_EXIM_FILTER << 16),
  41       LOFF(bit_options) },
  42   { "forbid_file",        opt_bool,
  43       LOFF(forbid_file) },
  44   { "forbid_filter_dlfunc", opt_bit | (RDON_DLFUNC << 16),
  45       LOFF(bit_options) },
  46   { "forbid_filter_existstest",  opt_bit | (RDON_EXISTS << 16),
  47       LOFF(bit_options) },
  48   { "forbid_filter_logwrite",opt_bit | (RDON_LOG << 16),
  49       LOFF(bit_options) },
  50   { "forbid_filter_lookup", opt_bit | (RDON_LOOKUP << 16),
  51       LOFF(bit_options) },
  52   { "forbid_filter_perl", opt_bit | (RDON_PERL << 16),
  53       LOFF(bit_options) },
  54   { "forbid_filter_readfile", opt_bit | (RDON_READFILE << 16),
  55       LOFF(bit_options) },
  56   { "forbid_filter_readsocket", opt_bit | (RDON_READSOCK << 16),
  57       LOFF(bit_options) },
  58   { "forbid_filter_reply",opt_bool,
  59       LOFF(forbid_filter_reply) },
  60   { "forbid_filter_run",  opt_bit | (RDON_RUN << 16),
  61       LOFF(bit_options) },
  62   { "forbid_include",     opt_bit | (RDON_INCLUDE << 16),
  63       LOFF(bit_options) },
  64   { "forbid_pipe",        opt_bool,
  65       LOFF(forbid_pipe) },
  66   { "forbid_sieve_filter",opt_bit | (RDON_SIEVE_FILTER << 16),
  67       LOFF(bit_options) },
  68   { "forbid_smtp_code",     opt_bool,
  69       LOFF(forbid_smtp_code) },
  70   { "hide_child_in_errmsg", opt_bool,
  71       LOFF( hide_child_in_errmsg) },
  72   { "ignore_eacces",      opt_bit | (RDON_EACCES << 16),
  73       LOFF(bit_options) },
  74   { "ignore_enotdir",     opt_bit | (RDON_ENOTDIR << 16),
  75       LOFF(bit_options) },
  76
  77   { "include_directory",  opt_stringptr,        LOFF( include_directory) },
  78   { "modemask",           opt_octint,           LOFF(modemask) },
  79   { "one_time",           opt_bool,             LOFF(one_time) },
  80   { "owners",             opt_uidlist,          LOFF(owners) },
  81   { "owngroups",          opt_gidlist,          LOFF(owngroups) },
  82   { "pipe_transport",     opt_stringptr,        LOFF(pipe_transport_name) },
  83   { "qualify_domain",     opt_stringptr,        LOFF(qualify_domain) },
  84   { "qualify_preserve_domain", opt_bool,        LOFF(qualify_preserve_domain) },
  85   { "repeat_use",         opt_bool | opt_public, OPT_OFF(router_instance, repeat_use) },
  86   { "reply_transport",    opt_stringptr,        LOFF(reply_transport_name) },
  87
  88   { "rewrite",            opt_bit | (RDON_REWRITE << 16),
  89       LOFF(bit_options) },
  90
  91   { "sieve_enotify_mailto_owner", opt_stringptr, LOFF(sieve_enotify_mailto_owner) },
  92   { "sieve_subaddress", opt_stringptr,          LOFF(sieve_subaddress) },
  93   { "sieve_useraddress", opt_stringptr,         LOFF(sieve_useraddress) },
  94   { "sieve_vacation_directory", opt_stringptr,  LOFF(sieve_vacation_directory) },
  95   { "skip_syntax_errors", opt_bool,             LOFF(skip_syntax_errors) },
  96 #ifdef EXPERIMENTAL_SRS
  97   { "srs",                opt_stringptr,        LOFF(srs) },
  98   { "srs_alias",          opt_stringptr,        LOFF(srs_alias) },
  99   { "srs_condition",      opt_stringptr,        LOFF(srs_condition) },
 100   { "srs_dbinsert",       opt_stringptr,        LOFF(srs_dbinsert) },
 101   { "srs_dbselect",       opt_stringptr,        LOFF(srs_dbselect) },
 102 #endif
 103   { "syntax_errors_text", opt_stringptr,        LOFF(syntax_errors_text) },
 104   { "syntax_errors_to",   opt_stringptr,        LOFF(syntax_errors_to) }
 105 };
 106
 107 /* Size of the options list. An extern variable has to be used so that its
 108 address can appear in the tables drtables.c. */
 109
 110 int redirect_router_options_count =
 111   sizeof(redirect_router_options)/sizeof(optionlist);
 112
 113
 114 #ifdef MACRO_PREDEF
 115
 116 /* Dummy entries */
 117 redirect_router_options_block redirect_router_option_defaults = {0};
 118 void redirect_router_init(router_instance *rblock) {}
 119 int redirect_router_entry(router_instance *rblock, address_item *addr,
 120   struct passwd *pw, int verify, address_item **addr_local,
 121   address_item **addr_remote, address_item **addr_new,
 122   address_item **addr_succeed) {return 0;}
 123
 124 #else   /*!MACRO_PREDEF*/
 125
 126
 127
 128 /* Default private options block for the redirect router. */
 129
 130 redirect_router_options_block redirect_router_option_defaults = {
 131   NULL,        /* directory_transport */
 132   NULL,        /* file_transport */
 133   NULL,        /* pipe_transport */
 134   NULL,        /* reply_transport */
 135   NULL,        /* data */
 136   NULL,        /* directory_transport_name */
 137   NULL,        /* file */
 138   NULL,        /* file_dir */
 139   NULL,        /* file_transport_name */
 140   NULL,        /* include_directory */
 141   NULL,        /* pipe_transport_name */
 142   NULL,        /* reply_transport_name */
 143   NULL,        /* sieve_subaddress */
 144   NULL,        /* sieve_useraddress */
 145   NULL,        /* sieve_vacation_directory */
 146   NULL,        /* sieve_enotify_mailto_owner */
 147   NULL,        /* syntax_errors_text */
 148   NULL,        /* syntax_errors_to */
 149   NULL,        /* qualify_domain */
 150   NULL,        /* owners */
 151   NULL,        /* owngroups */
 152 #ifdef EXPERIMENTAL_SRS
 153   NULL,        /* srs */
 154   NULL,        /* srs_alias */
 155   NULL,        /* srs_condition */
 156   NULL,        /* srs_dbinsert */
 157   NULL,        /* srs_dbselect */
 158 #endif
 159   022,         /* modemask */
 160   RDO_REWRITE | RDO_PREPEND_HOME, /* bit_options */
 161   FALSE,       /* check_ancestor */
 162   TRUE_UNSET,  /* check_owner */
 163   TRUE_UNSET,  /* check_group */
 164   FALSE,       /* forbid_file */
 165   FALSE,       /* forbid_filter_reply */
 166   FALSE,       /* forbid_pipe */
 167   FALSE,       /* forbid_smtp_code */
 168   FALSE,       /* hide_child_in_errmsg */
 169   FALSE,       /* one_time */
 170   FALSE,       /* qualify_preserve_domain */
 171   FALSE        /* skip_syntax_errors */
 172 };
 173
 174
 175
 176 /*************************************************
 177 *          Initialization entry point            *
 178 *************************************************/
 179
 180 /* Called for each instance, after its options have been read, to enable
 181 consistency checks to be done, or anything else that needs to be set up. */
 182
 183 void redirect_router_init(router_instance *rblock)
 184 {
 185 redirect_router_options_block *ob =
 186   (redirect_router_options_block *)(rblock->options_block);
 187
 188 /* Either file or data must be set, but not both */
 189
 190 if ((ob->file == NULL) == (ob->data == NULL))
 191   log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n  "
 192     "%sone of \"file\" or \"data\" must be specified",
 193     rblock->name, (ob->file == NULL)? "" : "only ");
 194
 195 /* Onetime aliases can only be real addresses. Headers can't be manipulated.
 196 The combination of one_time and unseen is not allowed. We can't check the
 197 expansion of "unseen" here, but we assume that if it is set to anything other
 198 than false, there is likely to be a problem. */
 199
 200 if (ob->one_time)
 201   {
 202   ob->forbid_pipe = ob->forbid_file = ob->forbid_filter_reply = TRUE;
 203   if (rblock->extra_headers || rblock->remove_headers)
 204     log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n  "
 205       "\"headers_add\" and \"headers_remove\" are not permitted with "
 206       "\"one_time\"", rblock->name);
 207   if (rblock->unseen || rblock->expand_unseen)
 208     log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n  "
 209       "\"unseen\" may not be used with \"one_time\"", rblock->name);
 210   }
 211
 212 /* The defaults for check_owner and check_group depend on other settings. The
 213 defaults are: Check the owner if check_local_user or owners is set; check the
 214 group if check_local_user is set without a restriction on the group write bit,
 215 or if owngroups is set. */
 216
 217 if (ob->check_owner == TRUE_UNSET)
 218   ob->check_owner = rblock->check_local_user ||
 219                     (ob->owners && ob->owners[0] != 0);
 220
 221 if (ob->check_group == TRUE_UNSET)
 222   ob->check_group = (rblock->check_local_user && (ob->modemask & 020) == 0) ||
 223                     (ob->owngroups != NULL && ob->owngroups[0] != 0);
 224
 225 /* If explicit qualify domain set, the preserve option is locked out */
 226
 227 if (ob->qualify_domain && ob->qualify_preserve_domain)
 228   log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n  "
 229     "only one of \"qualify_domain\" or \"qualify_preserve_domain\" must be set",
 230     rblock->name);
 231
 232 /* If allow_filter is set, either user or check_local_user must be set. */
 233
 234 if (!rblock->check_local_user &&
 235     !rblock->uid_set &&
 236     rblock->expand_uid == NULL &&
 237     (ob->bit_options & RDO_FILTER) != 0)
 238   log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n  "
 239     "\"user\" or \"check_local_user\" must be set with \"allow_filter\"",
 240     rblock->name);
 241 }
 242
 243
 244
 245 /*************************************************
 246 *       Get errors address and header mods       *
 247 *************************************************/
 248
 249 /* This function is called when new addresses are generated, in order to
 250 sort out errors address and header modifications. We put the errors address
 251 into the parent address (even though it is never used from there because that
 252 address is never transported) so that it can be retrieved if any of the
 253 children gets routed by an "unseen" router. The clone of the child that is
 254 passed on must have the original errors_address value.
 255
 256 Arguments:
 257   rblock               the router control block
 258   addr                 the address being routed
 259   verify               v_none/v_recipient/v_sender/v_expn
 260   addr_prop            point to the propagated block, which is where the
 261                          new values are to be placed
 262
 263 Returns:    the result of rf_get_errors_address() or rf_get_munge_headers(),
 264             which is either OK or DEFER
 265 */
 266
 267 static int
 268 sort_errors_and_headers(router_instance *rblock, address_item *addr,
 269   int verify, address_item_propagated *addr_prop)
 270 {
 271 int frc = rf_get_errors_address(addr, rblock, verify,
 272   &addr_prop->errors_address);
 273 if (frc != OK) return frc;
 274 addr->prop.errors_address = addr_prop->errors_address;
 275 return rf_get_munge_headers(addr, rblock, &addr_prop->extra_headers,
 276   &addr_prop->remove_headers);
 277 }
 278
 279
 280
 281 /*************************************************
 282 *    Process a set of generated new addresses    *
 283 *************************************************/
 284
 285 /* This function sets up a set of newly generated child addresses and puts them
 286 on the new address chain. Copy in the uid, gid and permission flags for use by
 287 pipes and files, set the parent, and "or" its af_ignore_error flag. Also record
 288 the setting for any starting router.
 289
 290 If the generated address is the same as one of its ancestors, and the
 291 check_ancestor flag is set, do not use this generated address, but replace it
 292 with a copy of the input address. This is to cope with cases where A is aliased
 293 to B and B has a .forward file pointing to A, though it is usually set on the
 294 forwardfile rather than the aliasfile. We can't just pass on the old
 295 address by returning FAIL, because it must act as a general parent for
 296 generated addresses, and only get marked "done" when all its children are
 297 delivered.
 298
 299 Arguments:
 300   rblock                  router block
 301   addr_new                new address chain
 302   addr                    original address
 303   generated               list of generated addresses
 304   addr_prop               the propagated block, containing the errors_address,
 305                             header modification stuff, and address_data
 306   ugidptr                 points to uid/gid data for files, pipes, autoreplies
 307   pw                      password entry, set if ob->check_local_user is TRUE
 308
 309 Returns:         nothing
 310 */
 311
 312 static void
 313 add_generated(router_instance *rblock, address_item **addr_new,
 314   address_item *addr, address_item *generated,
 315   address_item_propagated *addr_prop, ugid_block *ugidptr, struct passwd *pw)
 316 {
 317 redirect_router_options_block *ob =
 318   (redirect_router_options_block *)(rblock->options_block);
 319
 320 while (generated)
 321   {
 322   address_item *parent;
 323   address_item *next = generated;
 324   uschar *errors_address = next->prop.errors_address;
 325
 326   generated = next->next;
 327   next->parent = addr;
 328   next->start_router = rblock->redirect_router;
 329   if (addr->child_count == USHRT_MAX)
 330     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s router generated more than %d "
 331       "child addresses for <%s>", rblock->name, USHRT_MAX, addr->address);
 332   addr->child_count++;
 333
 334   next->next = *addr_new;
 335   *addr_new = next;
 336
 337   /* Don't do the "one_time" thing for the first pass of a 2-stage queue run. */
 338
 339   if (ob->one_time && !f.queue_2stage)
 340     {
 341     for (parent = addr; parent->parent; parent = parent->parent) ;
 342     next->onetime_parent = parent->address;
 343     }
 344
 345   if (ob->hide_child_in_errmsg) setflag(next, af_hide_child);
 346
 347   /* If check_ancestor is set, we want to know if any ancestor of this address
 348   is the address we are about to generate. The check must be done caselessly
 349   unless the ancestor was routed by a case-sensitive router. */
 350
 351   if (ob->check_ancestor)
 352     for (parent = addr; parent; parent = parent->parent)
 353       if ((parent->router && parent->router->caseful_local_part
 354            ? Ustrcmp(next->address, parent->address)
 355            : strcmpic(next->address, parent->address)
 356           ) == 0)
 357         {
 358         DEBUG(D_route) debug_printf("generated parent replaced by child\n");
 359         next->address = string_copy(addr->address);
 360         break;
 361         }
 362
 363   /* A user filter may, under some circumstances, set up an errors address.
 364   If so, we must take care to re-instate it when we copy in the propagated
 365   data so that it overrides any errors_to setting on the router. */
 366
 367     {
 368     BOOL ignore_error = next->prop.ignore_error;
 369     next->prop = *addr_prop;
 370     next->prop.ignore_error = ignore_error || addr->prop.ignore_error;
 371     }
 372   if (errors_address) next->prop.errors_address = errors_address;
 373
 374   /* For pipes, files, and autoreplies, record this router as handling them,
 375   because they don't go through the routing process again. Then set up uid,
 376   gid, home and current directories for transporting. */
 377
 378   if (testflag(next, af_pfr))
 379     {
 380     next->router = rblock;
 381     rf_set_ugid(next, ugidptr);   /* Will contain pw values if not overridden */
 382
 383     /* When getting the home directory out of the password information, wrap it
 384     in \N...\N to avoid expansion later. In Cygwin, home directories can
 385     contain $ characters. */
 386
 387     if (rblock->home_directory != NULL)
 388       next->home_dir = rblock->home_directory;
 389     else if (rblock->check_local_user)
 390       next->home_dir = string_sprintf("\\N%s\\N", pw->pw_dir);
 391     else if (rblock->router_home_directory != NULL &&
 392              testflag(addr, af_home_expanded))
 393       {
 394       next->home_dir = deliver_home;
 395       setflag(next, af_home_expanded);
 396       }
 397
 398     next->current_dir = rblock->current_directory;
 399
 400     /* Permission options */
 401
 402     if (!ob->forbid_pipe) setflag(next, af_allow_pipe);
 403     if (!ob->forbid_file) setflag(next, af_allow_file);
 404     if (!ob->forbid_filter_reply) setflag(next, af_allow_reply);
 405
 406     /* If the transport setting fails, the error gets picked up at the outer
 407     level from the setting of basic_errno in the address. */
 408
 409     if (next->address[0] == '|')
 410       {
 411       address_pipe = next->address;
 412       if (rf_get_transport(ob->pipe_transport_name, &(ob->pipe_transport),
 413           next, rblock->name, US"pipe_transport"))
 414         next->transport = ob->pipe_transport;
 415       address_pipe = NULL;
 416       }
 417     else if (next->address[0] == '>')
 418       {
 419       if (rf_get_transport(ob->reply_transport_name, &(ob->reply_transport),
 420           next, rblock->name, US"reply_transport"))
 421         next->transport = ob->reply_transport;
 422       }
 423     else  /* must be file or directory */
 424       {
 425       int len = Ustrlen(next->address);
 426       address_file = next->address;
 427       if (next->address[len-1] == '/')
 428         {
 429         if (rf_get_transport(ob->directory_transport_name,
 430             &(ob->directory_transport), next, rblock->name,
 431             US"directory_transport"))
 432           next->transport = ob->directory_transport;
 433         }
 434       else
 435         {
 436         if (rf_get_transport(ob->file_transport_name, &(ob->file_transport),
 437             next, rblock->name, US"file_transport"))
 438           next->transport = ob->file_transport;
 439         }
 440       address_file = NULL;
 441       }
 442     }
 443
 444 #ifdef SUPPORT_I18N
 445     if (!next->prop.utf8_msg)
 446       next->prop.utf8_msg = string_is_utf8(next->address)
 447         || (sender_address && string_is_utf8(sender_address));
 448 #endif
 449
 450   DEBUG(D_route)
 451     {
 452     debug_printf("%s router generated %s\n  %serrors_to=%s transport=%s\n",
 453       rblock->name,
 454       next->address,
 455       testflag(next, af_pfr)? "pipe, file, or autoreply\n  " : "",
 456       next->prop.errors_address,
 457       (next->transport == NULL)? US"NULL" : next->transport->name);
 458
 459     if (testflag(next, af_uid_set))
 460       debug_printf("  uid=%ld ", (long int)(next->uid));
 461     else
 462       debug_printf("  uid=unset ");
 463
 464     if (testflag(next, af_gid_set))
 465       debug_printf("gid=%ld ", (long int)(next->gid));
 466     else
 467       debug_printf("gid=unset ");
 468
 469 #ifdef SUPPORT_I18N
 470     if (next->prop.utf8_msg) debug_printf("utf8 ");
 471 #endif
 472
 473     debug_printf("home=%s\n", next->home_dir);
 474     }
 475   }
 476 }
 477
 478
 479 /*************************************************
 480 *              Main entry point                  *
 481 *************************************************/
 482
 483 /* See local README for interface description. This router returns:
 484
 485 DECLINE
 486   . empty address list, or filter did nothing significant
 487
 488 DEFER
 489   . verifying the errors address caused a deferment or a big disaster such
 490       as an expansion failure (rf_get_errors_address)
 491   . expanding a headers_{add,remove} string caused a deferment or another
 492       expansion error (rf_get_munge_headers)
 493   . :defer: or "freeze" in a filter
 494   . error in address list or filter
 495   . skipped syntax errors, but failed to send the message
 496
 497 DISCARD
 498   . address was :blackhole:d or "seen finish"ed
 499
 500 FAIL
 501   . :fail:
 502
 503 OK
 504   . new addresses added to addr_new
 505 */
 506
 507 int redirect_router_entry(
 508   router_instance *rblock,        /* data for this instantiation */
 509   address_item *addr,             /* address we are working on */
 510   struct passwd *pw,              /* passwd entry after check_local_user */
 511   int verify,                     /* v_none/v_recipient/v_sender/v_expn */
 512   address_item **addr_local,      /* add it to this if it's local */
 513   address_item **addr_remote,     /* add it to this if it's remote */
 514   address_item **addr_new,        /* put new addresses on here */
 515   address_item **addr_succeed)    /* put old address here on success */
 516 {
 517 redirect_router_options_block *ob =
 518   (redirect_router_options_block *)(rblock->options_block);
 519 address_item *generated = NULL;
 520 const uschar *save_qualify_domain_recipient = qualify_domain_recipient;
 521 uschar *discarded = US"discarded";
 522 address_item_propagated addr_prop;
 523 error_block *eblock = NULL;
 524 ugid_block ugid;
 525 redirect_block redirect;
 526 int filtertype = FILTER_UNSET;
 527 int yield = OK;
 528 int options = ob->bit_options;
 529 int frc = 0;
 530 int xrc = 0;
 531
 532 addr_local = addr_local;     /* Keep picky compilers happy */
 533 addr_remote = addr_remote;
 534
 535 /* Initialize the data to be propagated to the children */
 536
 537 addr_prop.address_data = deliver_address_data;
 538 addr_prop.domain_data = deliver_domain_data;
 539 addr_prop.localpart_data = deliver_localpart_data;
 540 addr_prop.errors_address = NULL;
 541 addr_prop.extra_headers = NULL;
 542 addr_prop.remove_headers = NULL;
 543 addr_prop.variables = NULL;
 544 tree_dup((tree_node **)&addr_prop.variables, addr->prop.variables);
 545
 546 #ifdef EXPERIMENTAL_SRS
 547 addr_prop.srs_sender = NULL;
 548 #endif
 549 #ifdef SUPPORT_I18N
 550 addr_prop.utf8_msg = addr->prop.utf8_msg;
 551 addr_prop.utf8_downcvt = addr->prop.utf8_downcvt;
 552 addr_prop.utf8_downcvt_maybe = addr->prop.utf8_downcvt_maybe;
 553 #endif
 554
 555
 556 /* When verifying and testing addresses, the "logwrite" command in filters
 557 must be bypassed. */
 558
 559 if (verify == v_none && !f.address_test_mode) options |= RDO_REALLOG;
 560
 561 /* Sort out the fixed or dynamic uid/gid. This uid is used (a) for reading the
 562 file (and interpreting a filter) and (b) for running the transports for
 563 generated file and pipe addresses. It is not (necessarily) the same as the uids
 564 that may own the file. Exim panics if an expanded string is not a number and
 565 can't be found in the password file. Other errors set the freezing bit. */
 566
 567 if (!rf_get_ugid(rblock, addr, &ugid)) return DEFER;
 568
 569 if (!ugid.uid_set && pw != NULL)
 570   {
 571   ugid.uid = pw->pw_uid;
 572   ugid.uid_set = TRUE;
 573   }
 574
 575 if (!ugid.gid_set && pw != NULL)
 576   {
 577   ugid.gid = pw->pw_gid;
 578   ugid.gid_set = TRUE;
 579   }
 580
 581 #ifdef EXPERIMENTAL_SRS
 582   /* Perform SRS on recipient/return-path as required  */
 583
 584   if(ob->srs != NULL)
 585   {
 586     BOOL usesrs = TRUE;
 587
 588     if(ob->srs_condition != NULL)
 589       usesrs = expand_check_condition(ob->srs_condition, "srs_condition expansion failed", NULL);
 590
 591     if(usesrs)
 592     {
 593       int srs_action = 0, n_srs;
 594       uschar *res;
 595       uschar *usedomain;
 596
 597       /* What are we doing? */
 598       if(Ustrcmp(ob->srs, "forward") == 0)
 599         srs_action = 1;
 600       else if(Ustrcmp(ob->srs, "reverseandforward") == 0)
 601       {
 602         srs_action = 3;
 603
 604         if((ob->srs_dbinsert == NULL) ^ (ob->srs_dbselect == NULL))
 605           return DEFER;
 606       }
 607       else if(Ustrcmp(ob->srs, "reverse") == 0)
 608         srs_action = 2;
 609
 610       /* Reverse SRS */
 611       if(srs_action & 2)
 612       {
 613         srs_orig_recipient = addr->address;
 614
 615         eximsrs_init();
 616         if(ob->srs_dbselect)
 617           eximsrs_db_set(TRUE, ob->srs_dbselect);
 618 /* Comment this out for now...
 619 //        else
 620 //          eximsrs_db_set(TRUE, NULL);
 621 */
 622
 623         if((n_srs = eximsrs_reverse(&res, addr->address)) == OK)
 624         {
 625           srs_recipient = res;
 626           DEBUG(D_any)
 627             debug_printf("SRS (reverse): Recipient '%s' rewritten to '%s'\n", srs_orig_recipient, srs_recipient);
 628         }
 629
 630         eximsrs_done();
 631
 632         if(n_srs != OK)
 633           return n_srs;
 634       }
 635
 636       /* Forward SRS */
 637       /* No point in actually performing SRS if we are just verifying a recipient */
 638       if((srs_action & 1) && verify == v_none &&
 639          (sender_address ? sender_address[0] != 0 : FALSE))
 640       {
 641
 642         srs_orig_sender = sender_address;
 643         eximsrs_init();
 644         if(ob->srs_dbinsert)
 645           eximsrs_db_set(FALSE, ob->srs_dbinsert);
 646 /* Comment this out for now...
 647 //        else
 648 //          eximsrs_db_set(FALSE, NULL);
 649 */
 650
 651         if (!(usedomain = ob->srs_alias ? expand_string(ob->srs_alias) : NULL))
 652           usedomain = string_copy(deliver_domain);
 653
 654         if((n_srs = eximsrs_forward(&res, sender_address, usedomain)) == OK)
 655         {
 656           addr_prop.srs_sender = res;
 657           DEBUG(D_any)
 658             debug_printf("SRS (forward): Sender '%s' rewritten to '%s'\n", srs_orig_sender, res);
 659         }
 660
 661         eximsrs_done();
 662
 663         if(n_srs != OK)
 664           return n_srs;
 665       }
 666     }
 667   }
 668 #endif
 669
 670 /* Call the function that interprets redirection data, either inline or from a
 671 file. This is a separate function so that the system filter can use it. It will
 672 run the function in a subprocess if necessary. If qualify_preserve_domain is
 673 set, temporarily reset qualify_domain_recipient to the current domain so that
 674 any unqualified addresses get qualified with the same domain as the incoming
 675 address. Otherwise, if a local qualify_domain is provided, set that up. */
 676
 677 if (ob->qualify_preserve_domain)
 678   qualify_domain_recipient = addr->domain;
 679 else if (ob->qualify_domain)
 680   {
 681   uschar *new_qdr = rf_expand_data(addr, ob->qualify_domain, &xrc);
 682   if (!new_qdr) return xrc;
 683   qualify_domain_recipient = new_qdr;
 684   }
 685
 686 redirect.owners = ob->owners;
 687 redirect.owngroups = ob->owngroups;
 688 redirect.modemask = ob->modemask;
 689 redirect.check_owner = ob->check_owner;
 690 redirect.check_group = ob->check_group;
 691 redirect.pw = pw;
 692
 693 redirect.string = (redirect.isfile = (ob->file != NULL))
 694   ? ob->file : ob->data;
 695
 696 frc = rda_interpret(&redirect, options, ob->include_directory,
 697   ob->sieve_vacation_directory, ob->sieve_enotify_mailto_owner,
 698   ob->sieve_useraddress, ob->sieve_subaddress, &ugid, &generated,
 699   &(addr->message), ob->skip_syntax_errors? &eblock : NULL, &filtertype,
 700   string_sprintf("%s router (recipient is %s)", rblock->name, addr->address));
 701
 702 qualify_domain_recipient = save_qualify_domain_recipient;
 703
 704 /* Handle exceptional returns from filtering or processing an address list.
 705 For FAIL and FREEZE we honour any previously set up deliveries by a filter. */
 706
 707 switch (frc)
 708   {
 709   case FF_NONEXIST:
 710     addr->message = addr->user_message = NULL;
 711     return DECLINE;
 712
 713   case FF_BLACKHOLE:
 714     DEBUG(D_route) debug_printf("address :blackhole:d\n");
 715     generated = NULL;
 716     discarded = US":blackhole:";
 717     frc = FF_DELIVERED;
 718     break;
 719
 720     /* FF_DEFER and FF_FAIL can arise only as a result of explicit commands
 721     (:defer: or :fail: in an alias file or "fail" in a filter). If a configured
 722     message was supplied, allow it to be included in an SMTP response after
 723     verifying. Remove any SMTP code if it is not allowed. */
 724
 725   case FF_DEFER:
 726     yield = DEFER;
 727     goto SORT_MESSAGE;
 728
 729   case FF_FAIL:
 730     if ((xrc = sort_errors_and_headers(rblock, addr, verify, &addr_prop)) != OK)
 731       return xrc;
 732     add_generated(rblock, addr_new, addr, generated, &addr_prop, &ugid, pw);
 733     yield = FAIL;
 734
 735     SORT_MESSAGE:
 736     if (!addr->message)
 737       addr->message = yield == FAIL ? US"forced rejection" : US"forced defer";
 738     else
 739       {
 740       int ovector[3];
 741       if (ob->forbid_smtp_code &&
 742           pcre_exec(regex_smtp_code, NULL, CS addr->message,
 743             Ustrlen(addr->message), 0, PCRE_EOPT,
 744             ovector, sizeof(ovector)/sizeof(int)) >= 0)
 745         {
 746         DEBUG(D_route) debug_printf("SMTP code at start of error message "
 747           "is ignored because forbid_smtp_code is set\n");
 748         addr->message += ovector[1];
 749         }
 750       addr->user_message = addr->message;
 751       setflag(addr, af_pass_message);
 752       }
 753     return yield;
 754
 755     /* As in the case of a system filter, a freeze does not happen after a manual
 756     thaw. In case deliveries were set up by the filter, we set the child count
 757     high so that their completion does not mark the original address done. */
 758
 759   case FF_FREEZE:
 760     if (!f.deliver_manual_thaw)
 761       {
 762       if ((xrc = sort_errors_and_headers(rblock, addr, verify, &addr_prop))
 763         != OK) return xrc;
 764       add_generated(rblock, addr_new, addr, generated, &addr_prop, &ugid, pw);
 765       if (addr->message == NULL) addr->message = US"frozen by filter";
 766       addr->special_action = SPECIAL_FREEZE;
 767       addr->child_count = 9999;
 768       return DEFER;
 769       }
 770     frc = FF_NOTDELIVERED;
 771     break;
 772
 773     /* Handle syntax errors and :include: failures and lookup defers */
 774
 775   case FF_ERROR:
 776   case FF_INCLUDEFAIL:
 777
 778     /* If filtertype is still FILTER_UNSET, it means that the redirection data
 779     was never inspected, so the error was an expansion failure or failure to open
 780     the file, or whatever. In these cases, the existing error message is probably
 781     sufficient. */
 782
 783     if (filtertype == FILTER_UNSET) return DEFER;
 784
 785     /* If it was a filter and skip_syntax_errors is set, we want to set up
 786     the error message so that it can be logged and mailed to somebody. */
 787
 788     if (filtertype != FILTER_FORWARD && ob->skip_syntax_errors)
 789       {
 790       eblock = store_get(sizeof(error_block), FALSE);
 791       eblock->next = NULL;
 792       eblock->text1 = addr->message;
 793       eblock->text2 = NULL;
 794       addr->message = addr->user_message = NULL;
 795       }
 796
 797     /* Otherwise set up the error for the address and defer. */
 798
 799     else
 800       {
 801       addr->basic_errno = ERRNO_BADREDIRECT;
 802       addr->message = string_sprintf("error in %s %s: %s",
 803         filtertype == FILTER_FORWARD ? "redirect" : "filter",
 804         ob->data ? "data" : "file",
 805         addr->message);
 806       return DEFER;
 807       }
 808   }
 809
 810
 811 /* Yield is either FF_DELIVERED (significant action) or FF_NOTDELIVERED (no
 812 significant action). Before dealing with these, however, we must handle the
 813 effect of skip_syntax_errors.
 814
 815 If skip_syntax_errors was set and there were syntax errors in an address list,
 816 error messages will be present in eblock. Log them and send a message if so
 817 configured. We cannot do this earlier, because the error message must not be
 818 sent as the local user. If there were no valid addresses, generated will be
 819 NULL. In this case, the router declines.
 820
 821 For a filter file, the error message has been fudged into an eblock. After
 822 dealing with it, the router declines. */
 823
 824 if (eblock != NULL)
 825   {
 826   if (!moan_skipped_syntax_errors(
 827         rblock->name,                            /* For message content */
 828         eblock,                                  /* Ditto */
 829         (verify != v_none || f.address_test_mode)?
 830           NULL : ob->syntax_errors_to,           /* Who to mail */
 831         generated != NULL,                       /* True if not all failed */
 832         ob->syntax_errors_text))                 /* Custom message */
 833     return DEFER;
 834
 835   if (filtertype != FILTER_FORWARD || generated == NULL)
 836     {
 837     addr->message = US"syntax error in redirection data";
 838     return DECLINE;
 839     }
 840   }
 841
 842 /* Sort out the errors address and any header modifications, and handle the
 843 generated addresses, if any. If there are no generated addresses, we must avoid
 844 calling sort_errors_and_headers() in case this router declines - that function
 845 may modify the errors_address field in the current address, and we don't want
 846 to do that for a decline. */
 847
 848 if (generated != NULL)
 849   {
 850   if ((xrc = sort_errors_and_headers(rblock, addr, verify, &addr_prop)) != OK)
 851     return xrc;
 852   add_generated(rblock, addr_new, addr, generated, &addr_prop, &ugid, pw);
 853   }
 854
 855 /* FF_DELIVERED with no generated addresses is what we get when an address list
 856 contains :blackhole: or a filter contains "seen finish" without having
 857 generated anything. Log what happened to this address, and return DISCARD. */
 858
 859 if (frc == FF_DELIVERED)
 860   {
 861   if (generated == NULL && verify == v_none && !f.address_test_mode)
 862     {
 863     log_write(0, LOG_MAIN, "=> %s <%s> R=%s", discarded, addr->address,
 864       rblock->name);
 865     yield = DISCARD;
 866     }
 867   }
 868
 869 /* For an address list, FF_NOTDELIVERED always means that no addresses were
 870 generated. For a filter, addresses may or may not have been generated. If none
 871 were, it's the same as an empty address list, and the router declines. However,
 872 if addresses were generated, we can't just decline because successful delivery
 873 of the base address gets it marked "done", so deferred generated addresses
 874 never get tried again. We have to generate a new version of the base address,
 875 as if there were a "deliver" command in the filter file, with the original
 876 address as parent. */
 877
 878 else
 879   {
 880   address_item *next;
 881
 882   if (generated == NULL) return DECLINE;
 883
 884   next = deliver_make_addr(addr->address, FALSE);
 885   next->parent = addr;
 886   addr->child_count++;
 887   next->next = *addr_new;
 888   *addr_new = next;
 889
 890   /* Set the data that propagates. */
 891
 892   next->prop = addr_prop;
 893
 894   DEBUG(D_route) debug_printf("%s router autogenerated %s\n%s%s%s",
 895     rblock->name,
 896     next->address,
 897     (addr_prop.errors_address != NULL)? "  errors to " : "",
 898     (addr_prop.errors_address != NULL)? addr_prop.errors_address : US"",
 899     (addr_prop.errors_address != NULL)? "\n" : "");
 900   }
 901
 902 /* Control gets here only when the address has been completely handled. Put the
 903 original address onto the succeed queue so that any retry items that get
 904 attached to it get processed. */
 905
 906 addr->next = *addr_succeed;
 907 *addr_succeed = addr;
 908
 909 return yield;
 910 }
 911
 912 #endif   /*!MACRO_PREDEF*/
 913 /* End of routers/redirect.c */