1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
10 #include "rf_functions.h"
11 #include "manualroute.h"
14 /* Options specific to the manualroute router. */
16 optionlist manualroute_router_options[] = {
17 { "host_all_ignored", opt_stringptr,
18 (void *)(offsetof(manualroute_router_options_block, host_all_ignored)) },
19 { "host_find_failed", opt_stringptr,
20 (void *)(offsetof(manualroute_router_options_block, host_find_failed)) },
21 { "hosts_randomize", opt_bool,
22 (void *)(offsetof(manualroute_router_options_block, hosts_randomize)) },
23 { "route_data", opt_stringptr,
24 (void *)(offsetof(manualroute_router_options_block, route_data)) },
25 { "route_list", opt_stringptr,
26 (void *)(offsetof(manualroute_router_options_block, route_list)) },
27 { "same_domain_copy_routing", opt_bool|opt_public,
28 (void *)(offsetof(router_instance, same_domain_copy_routing)) }
31 /* Size of the options list. An extern variable has to be used so that its
32 address can appear in the tables drtables.c. */
34 int manualroute_router_options_count =
35 sizeof(manualroute_router_options)/sizeof(optionlist);
41 manualroute_router_options_block manualroute_router_option_defaults = {0};
42 void manualroute_router_init(router_instance *rblock) {}
43 int manualroute_router_entry(router_instance *rblock, address_item *addr,
44 struct passwd *pw, int verify, address_item **addr_local,
45 address_item **addr_remote, address_item **addr_new,
46 address_item **addr_succeed) {return 0;}
48 #else /*!MACRO_PREDEF*/
52 /* Default private options block for the manualroute router. */
54 manualroute_router_options_block manualroute_router_option_defaults = {
55 -1, /* host_all_ignored code (unset) */
56 -1, /* host_find_failed code (unset) */
57 FALSE, /* hosts_randomize */
58 US"defer", /* host_all_ignored */
59 US"freeze", /* host_find_failed */
60 NULL, /* route_data */
65 /* Names and values for host_find_failed and host_all_ignored. */
67 static uschar *hff_names[] = {
68 US"ignore", /* MUST be first - not valid for host_all_ignored */
75 static int hff_codes[] = { hff_ignore, hff_decline, hff_defer, hff_fail,
76 hff_freeze, hff_pass };
78 static int hff_count= sizeof(hff_codes)/sizeof(int);
82 /*************************************************
83 * Initialization entry point *
84 *************************************************/
86 /* Called for each instance, after its options have been read, to enable
87 consistency checks to be done, or anything else that needs to be set up. */
90 manualroute_router_init(router_instance *rblock)
92 manualroute_router_options_block *ob =
93 (manualroute_router_options_block *)(rblock->options_block);
96 /* Host_find_failed must be a recognized word */
98 for (i = 0; i < hff_count; i++)
100 if (Ustrcmp(ob->host_find_failed, hff_names[i]) == 0)
102 ob->hff_code = hff_codes[i];
106 if (ob->hff_code < 0)
107 log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n "
108 "unrecognized setting for host_find_failed option", rblock->name);
110 for (i = 1; i < hff_count; i++) /* NB starts at 1 to skip "ignore" */
112 if (Ustrcmp(ob->host_all_ignored, hff_names[i]) == 0)
114 ob->hai_code = hff_codes[i];
118 if (ob->hai_code < 0)
119 log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n "
120 "unrecognized setting for host_all_ignored option", rblock->name);
122 /* One of route_list or route_data must be specified */
124 if ((ob->route_list == NULL && ob->route_data == NULL) ||
125 (ob->route_list != NULL && ob->route_data != NULL))
126 log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n "
127 "route_list or route_data (but not both) must be specified",
134 /*************************************************
135 * Parse a route item *
136 *************************************************/
138 /* The format of a route list item is:
140 <domain> [<host[list]> [<options>]]
142 if obtained from route_list. The domain is absent if the string came from
143 route_data, in which case domain==NULL. The domain and the host list may be
147 s pointer to route list item
148 domain if not NULL, where to put the domain pointer
149 hostlist where to put the host[list] pointer
150 options where to put the options pointer
152 Returns: FALSE if domain expected and string is empty;
157 parse_route_item(const uschar *s, const uschar **domain, const uschar **hostlist,
158 const uschar **options)
160 while (*s != 0 && isspace(*s)) s++;
164 if (!*s) return FALSE; /* missing data */
165 *domain = string_dequote(&s);
166 while (*s && isspace(*s)) s++;
169 *hostlist = string_dequote(&s);
170 while (*s && isspace(*s)) s++;
177 /*************************************************
179 *************************************************/
181 /* The manualroute router provides a manual routing facility (surprise,
182 surprise). The data that defines the routing can either be set in route_data
183 (which means it can be found by, for example, looking up the domain in a file),
184 or a list of domain patterns and their corresponding data can be provided in
187 /* See local README for interface details. This router returns:
190 . no pattern in route_list matched (route_data not set)
191 . route_data was an empty string (route_list not set)
192 . forced expansion failure in route_data (rf_expand_data)
193 . forced expansion of host list
194 . host_find_failed = decline
197 . transport not defined when needed
198 . lookup defer in route_list when matching domain pattern
199 . non-forced expansion failure in route_data
200 . non-forced expansion failure in host list
201 . unknown routing option
202 . host list missing for remote transport (not verifying)
203 . timeout etc on host lookup (pass_on_timeout not set)
204 . verifying the errors address caused a deferment or a big disaster such
205 as an expansion failure (rf_get_errors_address)
206 . expanding a headers_{add,remove} string caused a deferment or another
207 expansion error (rf_get_munge_headers)
208 . a problem in rf_get_transport: no transport when one is needed;
209 failed to expand dynamic transport; failed to find dynamic transport
210 . failure to expand or find a uid/gid (rf_get_ugid via rf_queue_add)
211 . host_find_failed = freeze or defer
212 . self = freeze or defer
215 . timeout etc on host lookup (pass_on_timeout set)
216 . host_find_failed = pass
223 . host_find_failed = fail
227 . added address to addr_local or addr_remote, as appropriate for the
228 type of transport; this includes the self="send" case.
232 manualroute_router_entry(
233 router_instance *rblock, /* data for this instantiation */
234 address_item *addr, /* address we are working on */
235 struct passwd *pw, /* passwd entry after check_local_user */
236 int verify, /* v_none/v_recipient/v_sender/v_expn */
237 address_item **addr_local, /* add it to this if it's local */
238 address_item **addr_remote, /* add it to this if it's remote */
239 address_item **addr_new, /* put new addresses on here */
240 address_item **addr_succeed) /* put old address here on success */
243 uschar *route_item = NULL;
244 const uschar *options = NULL;
245 const uschar *hostlist = NULL;
246 const uschar *domain;
248 const uschar *listptr;
249 manualroute_router_options_block *ob =
250 (manualroute_router_options_block *)(rblock->options_block);
251 transport_instance *transport = NULL;
252 BOOL individual_transport_set = FALSE;
253 BOOL randomize = ob->hosts_randomize;
255 addr_new = addr_new; /* Keep picky compilers happy */
256 addr_succeed = addr_succeed;
258 DEBUG(D_route) debug_printf("%s router called for %s\n domain = %s\n",
259 rblock->name, addr->address, addr->domain);
261 /* The initialization check ensures that either route_list or route_data is
266 int sep = -(';'); /* Default is semicolon */
267 listptr = ob->route_list;
269 while ((route_item = string_nextinlist(&listptr, &sep, NULL, 0)) != NULL)
273 DEBUG(D_route) debug_printf("route_item = %s\n", route_item);
274 if (!parse_route_item(route_item, &domain, &hostlist, &options))
275 continue; /* Ignore blank items */
277 /* Check the current domain; if it matches, break the loop */
279 if ((rc = match_isinlist(addr->domain, &domain, UCHAR_MAX+1,
280 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, CUSS &lookup_value)) == OK)
283 /* If there was a problem doing the check, defer */
287 addr->message = US"lookup defer in route_list";
292 if (!route_item) return DECLINE; /* No pattern in the list matched */
295 /* Handle a single routing item in route_data. If it expands to an empty
300 if (!(route_item = rf_expand_data(addr, ob->route_data, &rc)))
302 (void) parse_route_item(route_item, NULL, &hostlist, &options);
303 if (!hostlist[0]) return DECLINE;
306 /* Expand the hostlist item. It may then pointing to an empty string, or to a
307 single host or a list of hosts; options is pointing to the rest of the
308 routelist item, which is either empty or contains various option words. */
310 DEBUG(D_route) debug_printf("original list of hosts = '%s' options = '%s'\n",
313 newhostlist = expand_string_copy(hostlist);
314 lookup_value = NULL; /* Finished with */
317 /* If the expansion was forced to fail, just decline. Otherwise there is a
318 configuration problem. */
322 if (f.expand_string_forcedfail) return DECLINE;
323 addr->message = string_sprintf("%s router: failed to expand \"%s\": %s",
324 rblock->name, hostlist, expand_string_message);
327 else hostlist = newhostlist;
329 DEBUG(D_route) debug_printf("expanded list of hosts = '%s' options = '%s'\n",
332 /* Set default lookup type and scan the options */
334 lookup_type = LK_DEFAULT;
339 const uschar *s = options;
340 while (*options != 0 && !isspace(*options)) options++;
343 if (Ustrncmp(s, "randomize", n) == 0) randomize = TRUE;
344 else if (Ustrncmp(s, "no_randomize", n) == 0) randomize = FALSE;
345 else if (Ustrncmp(s, "byname", n) == 0)
346 lookup_type = lookup_type & ~(LK_DEFAULT | LK_BYDNS) | LK_BYNAME;
347 else if (Ustrncmp(s, "bydns", n) == 0)
348 lookup_type = lookup_type & ~(LK_DEFAULT | LK_BYNAME) & LK_BYDNS;
349 else if (Ustrncmp(s, "ipv4_prefer", n) == 0) lookup_type |= LK_IPV4_PREFER;
350 else if (Ustrncmp(s, "ipv4_only", n) == 0) lookup_type |= LK_IPV4_ONLY;
353 transport_instance *t;
354 for (t = transports; t; t = t->next)
355 if (Ustrncmp(t->name, s, n) == 0)
358 individual_transport_set = TRUE;
364 s = string_sprintf("unknown routing option or transport name \"%s\"", s);
365 log_write(0, LOG_MAIN, "Error in %s router: %s", rblock->name, s);
366 addr->message = string_sprintf("error in router: %s", s);
374 while (*options != 0 && isspace(*options)) options++;
378 /* Set up the errors address, if any. */
380 rc = rf_get_errors_address(addr, rblock, verify, &addr->prop.errors_address);
381 if (rc != OK) return rc;
383 /* Set up the additional and removeable headers for this address. */
385 rc = rf_get_munge_headers(addr, rblock, &addr->prop.extra_headers,
386 &addr->prop.remove_headers);
387 if (rc != OK) return rc;
389 /* If an individual transport is not set, get the transport for this router, if
390 any. It might be expanded, or it might be unset if this router has verify_only
393 if (!individual_transport_set)
395 if (!rf_get_transport(rblock->transport_name, &(rblock->transport), addr,
398 transport = rblock->transport;
401 /* Deal with the case of a local transport. The host list is passed over as a
402 single text string that ends up in $host. */
404 if (transport && transport->info->local)
409 addr->host_list = h = store_get(sizeof(host_item));
410 h->name = string_copy(hostlist);
414 h->status = hstatus_unknown;
415 h->why = hwhy_unknown;
420 /* There is nothing more to do other than to queue the address for the
421 local transport, filling in any uid/gid. This can be done by the common
422 rf_queue_add() function. */
424 addr->transport = transport;
425 return rf_queue_add(addr, addr_local, addr_remote, rblock, pw)?
429 /* There is either no transport (verify_only) or a remote transport. A host
430 list is mandatory in either case, except when verifying, in which case the
431 address is just accepted. */
435 if (verify != v_none) goto ROUTED;
436 addr->message = string_sprintf("error in %s router: no host(s) specified "
437 "for domain %s", rblock->name, addr->domain);
438 log_write(0, LOG_MAIN, "%s", addr->message);
442 /* Otherwise we finish the routing here by building a chain of host items
443 for the list of configured hosts, and then finding their addresses. */
445 host_build_hostlist(&addr->host_list, hostlist, randomize);
446 rc = rf_lookup_hostlist(rblock, addr, rblock->ignore_target_hosts, lookup_type,
447 ob->hff_code, addr_new);
448 if (rc != OK) return rc;
450 /* If host_find_failed is set to "ignore", it is possible for all the hosts to
451 be ignored, in which case we will end up with an empty host list. What happens
452 is controlled by host_all_ignored. */
454 if (!addr->host_list)
457 DEBUG(D_route) debug_printf("host_find_failed ignored every host\n");
458 if (ob->hai_code == hff_decline) return DECLINE;
459 if (ob->hai_code == hff_pass) return PASS;
461 for (i = 0; i < hff_count; i++)
462 if (ob->hai_code == hff_codes[i]) break;
464 addr->message = string_sprintf("lookup failed for all hosts in %s router: "
465 "host_find_failed=ignore host_all_ignored=%s", rblock->name, hff_names[i]);
467 if (ob->hai_code == hff_defer) return DEFER;
468 if (ob->hai_code == hff_fail) return FAIL;
470 addr->special_action = SPECIAL_FREEZE;
474 /* Finally, since we have done all the routing here, there must be a transport
475 defined for these hosts. It will be a remote one, as a local transport is
476 dealt with above. However, we don't need one if verifying only. */
478 if (transport == NULL && verify == v_none)
480 log_write(0, LOG_MAIN, "Error in %s router: no transport defined",
482 addr->message = US"error in router: transport missing";
486 /* Fill in the transport, queue for remote delivery. The yield of
487 rf_queue_add() is always TRUE for a remote transport. */
491 addr->transport = transport;
492 (void)rf_queue_add(addr, addr_local, addr_remote, rblock, NULL);
496 #endif /*!MACRO_PREDEF*/
497 /* End of routers/manualroute.c */