1 /* $Cambridge: exim/src/src/routers/manualroute.c,v 1.7 2009/11/16 19:50:38 nm4 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2009 */
8 /* See the file NOTICE for conditions of use and distribution. */
12 #include "rf_functions.h"
13 #include "manualroute.h"
16 /* Options specific to the manualroute router. */
18 optionlist manualroute_router_options[] = {
19 { "host_all_ignored", opt_stringptr,
20 (void *)(offsetof(manualroute_router_options_block, host_all_ignored)) },
21 { "host_find_failed", opt_stringptr,
22 (void *)(offsetof(manualroute_router_options_block, host_find_failed)) },
23 { "hosts_randomize", opt_bool,
24 (void *)(offsetof(manualroute_router_options_block, hosts_randomize)) },
25 { "route_data", opt_stringptr,
26 (void *)(offsetof(manualroute_router_options_block, route_data)) },
27 { "route_list", opt_stringptr,
28 (void *)(offsetof(manualroute_router_options_block, route_list)) },
29 { "same_domain_copy_routing", opt_bool|opt_public,
30 (void *)(offsetof(router_instance, same_domain_copy_routing)) }
33 /* Size of the options list. An extern variable has to be used so that its
34 address can appear in the tables drtables.c. */
36 int manualroute_router_options_count =
37 sizeof(manualroute_router_options)/sizeof(optionlist);
39 /* Default private options block for the manualroute router. */
41 manualroute_router_options_block manualroute_router_option_defaults = {
42 -1, /* host_all_ignored code (unset) */
43 -1, /* host_find_failed code (unset) */
44 FALSE, /* hosts_randomize */
45 US"defer", /* host_all_ignored */
46 US"freeze", /* host_find_failed */
47 NULL, /* route_data */
52 /* Names and values for host_find_failed and host_all_ignored. */
54 static uschar *hff_names[] = {
55 US"ignore", /* MUST be first - not valid for host_all_ignored */
62 static int hff_codes[] = { hff_ignore, hff_decline, hff_defer, hff_fail,
63 hff_freeze, hff_pass };
65 static int hff_count= sizeof(hff_codes)/sizeof(int);
69 /*************************************************
70 * Initialization entry point *
71 *************************************************/
73 /* Called for each instance, after its options have been read, to enable
74 consistency checks to be done, or anything else that needs to be set up. */
77 manualroute_router_init(router_instance *rblock)
79 manualroute_router_options_block *ob =
80 (manualroute_router_options_block *)(rblock->options_block);
83 /* Host_find_failed must be a recognized word */
85 for (i = 0; i < hff_count; i++)
87 if (Ustrcmp(ob->host_find_failed, hff_names[i]) == 0)
89 ob->hff_code = hff_codes[i];
94 log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n "
95 "unrecognized setting for host_find_failed option", rblock->name);
97 for (i = 1; i < hff_count; i++) /* NB starts at 1 to skip "ignore" */
99 if (Ustrcmp(ob->host_all_ignored, hff_names[i]) == 0)
101 ob->hai_code = hff_codes[i];
105 if (ob->hai_code < 0)
106 log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n "
107 "unrecognized setting for host_all_ignored option", rblock->name);
109 /* One of route_list or route_data must be specified */
111 if ((ob->route_list == NULL && ob->route_data == NULL) ||
112 (ob->route_list != NULL && ob->route_data != NULL))
113 log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s router:\n "
114 "route_list or route_data (but not both) must be specified",
121 /*************************************************
122 * Parse a route item *
123 *************************************************/
125 /* The format of a route list item is:
127 <domain> [<host[list]> [<options>]]
129 if obtained from route_list. The domain is absent if the string came from
130 route_data, in which case domain==NULL. The domain and the host list may be
134 s pointer to route list item
135 domain if not NULL, where to put the domain pointer
136 hostlist where to put the host[list] pointer
137 options where to put the options pointer
139 Returns: FALSE if domain expected and string is empty;
144 parse_route_item(uschar *s, uschar **domain, uschar **hostlist,
147 while (*s != 0 && isspace(*s)) s++;
151 if (*s == 0) return FALSE; /* missing data */
152 *domain = string_dequote(&s);
153 while (*s != 0 && isspace(*s)) s++;
156 *hostlist = string_dequote(&s);
157 while (*s != 0 && isspace(*s)) s++;
164 /*************************************************
166 *************************************************/
168 /* The manualroute router provides a manual routing facility (surprise,
169 surprise). The data that defines the routing can either be set in route_data
170 (which means it can be found by, for example, looking up the domain in a file),
171 or a list of domain patterns and their corresponding data can be provided in
174 /* See local README for interface details. This router returns:
177 . no pattern in route_list matched (route_data not set)
178 . route_data was an empty string (route_list not set)
179 . forced expansion failure in route_data (rf_expand_data)
180 . forced expansion of host list
181 . host_find_failed = decline
184 . transport not defined when needed
185 . lookup defer in route_list when matching domain pattern
186 . non-forced expansion failure in route_data
187 . non-forced expansion failure in host list
188 . unknown routing option
189 . host list missing for remote transport (not verifying)
190 . timeout etc on host lookup (pass_on_timeout not set)
191 . verifying the errors address caused a deferment or a big disaster such
192 as an expansion failure (rf_get_errors_address)
193 . expanding a headers_{add,remove} string caused a deferment or another
194 expansion error (rf_get_munge_headers)
195 . a problem in rf_get_transport: no transport when one is needed;
196 failed to expand dynamic transport; failed to find dynamic transport
197 . failure to expand or find a uid/gid (rf_get_ugid via rf_queue_add)
198 . host_find_failed = freeze or defer
199 . self = freeze or defer
202 . timeout etc on host lookup (pass_on_timeout set)
203 . host_find_failed = pass
210 . host_find_failed = fail
214 . added address to addr_local or addr_remote, as appropriate for the
215 type of transport; this includes the self="send" case.
219 manualroute_router_entry(
220 router_instance *rblock, /* data for this instantiation */
221 address_item *addr, /* address we are working on */
222 struct passwd *pw, /* passwd entry after check_local_user */
223 int verify, /* v_none/v_recipient/v_sender/v_expn */
224 address_item **addr_local, /* add it to this if it's local */
225 address_item **addr_remote, /* add it to this if it's remote */
226 address_item **addr_new, /* put new addresses on here */
227 address_item **addr_succeed) /* put old address here on success */
230 uschar *route_item = NULL;
231 uschar *options = NULL;
232 uschar *hostlist = NULL;
233 uschar *domain, *newhostlist, *listptr;
234 manualroute_router_options_block *ob =
235 (manualroute_router_options_block *)(rblock->options_block);
236 transport_instance *transport = NULL;
237 BOOL individual_transport_set = FALSE;
238 BOOL randomize = ob->hosts_randomize;
240 addr_new = addr_new; /* Keep picky compilers happy */
241 addr_succeed = addr_succeed;
243 DEBUG(D_route) debug_printf("%s router called for %s\n domain = %s\n",
244 rblock->name, addr->address, addr->domain);
246 /* The initialization check ensures that either route_list or route_data is
249 if (ob->route_list != NULL)
251 int sep = -(';'); /* Default is semicolon */
252 listptr = ob->route_list;
254 while ((route_item = string_nextinlist(&listptr, &sep, NULL, 0)) != NULL)
258 DEBUG(D_route) debug_printf("route_item = %s\n", route_item);
259 if (!parse_route_item(route_item, &domain, &hostlist, &options))
260 continue; /* Ignore blank items */
262 /* Check the current domain; if it matches, break the loop */
264 if ((rc = match_isinlist(addr->domain, &domain, UCHAR_MAX+1,
265 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, &lookup_value)) == OK)
268 /* If there was a problem doing the check, defer */
272 addr->message = US"lookup defer in route_list";
277 if (route_item == NULL) return DECLINE; /* No pattern in the list matched */
280 /* Handle a single routing item in route_data. If it expands to an empty
285 route_item = rf_expand_data(addr, ob->route_data, &rc);
286 if (route_item == NULL) return rc;
287 (void) parse_route_item(route_item, NULL, &hostlist, &options);
288 if (hostlist[0] == 0) return DECLINE;
291 /* Expand the hostlist item. It may then pointing to an empty string, or to a
292 single host or a list of hosts; options is pointing to the rest of the
293 routelist item, which is either empty or contains various option words. */
295 DEBUG(D_route) debug_printf("original list of hosts = \"%s\" options = %s\n",
298 newhostlist = expand_string_copy(hostlist);
299 lookup_value = NULL; /* Finished with */
302 /* If the expansion was forced to fail, just decline. Otherwise there is a
303 configuration problem. */
305 if (newhostlist == NULL)
307 if (expand_string_forcedfail) return DECLINE;
308 addr->message = string_sprintf("%s router: failed to expand \"%s\": %s",
309 rblock->name, hostlist, expand_string_message);
312 else hostlist = newhostlist;
314 DEBUG(D_route) debug_printf("expanded list of hosts = \"%s\" options = %s\n",
317 /* Set default lookup type and scan the options */
319 lookup_type = lk_default;
321 while (*options != 0)
325 while (*options != 0 && !isspace(*options)) options++;
329 if (Ustrcmp(s, "randomize") == 0) randomize = TRUE;
330 else if (Ustrcmp(s, "no_randomize") == 0) randomize = FALSE;
331 else if (Ustrcmp(s, "byname") == 0) lookup_type = lk_byname;
332 else if (Ustrcmp(s, "bydns") == 0) lookup_type = lk_bydns;
335 transport_instance *t;
336 for (t = transports; t != NULL; t = t->next)
338 if (Ustrcmp(t->name, s) == 0)
341 individual_transport_set = TRUE;
347 s = string_sprintf("unknown routing option or transport name \"%s\"", s);
348 log_write(0, LOG_MAIN, "Error in %s router: %s", rblock->name, s);
349 addr->message = string_sprintf("error in router: %s", s);
357 while (*options != 0 && isspace(*options)) options++;
361 /* Set up the errors address, if any. */
363 rc = rf_get_errors_address(addr, rblock, verify, &(addr->p.errors_address));
364 if (rc != OK) return rc;
366 /* Set up the additional and removeable headers for this address. */
368 rc = rf_get_munge_headers(addr, rblock, &(addr->p.extra_headers),
369 &(addr->p.remove_headers));
370 if (rc != OK) return rc;
372 /* If an individual transport is not set, get the transport for this router, if
373 any. It might be expanded, or it might be unset if this router has verify_only
376 if (!individual_transport_set)
378 if (!rf_get_transport(rblock->transport_name, &(rblock->transport), addr,
381 transport = rblock->transport;
384 /* Deal with the case of a local transport. The host list is passed over as a
385 single text string that ends up in $host. */
387 if (transport != NULL && transport->info->local)
389 if (hostlist[0] != 0)
392 addr->host_list = h = store_get(sizeof(host_item));
393 h->name = string_copy(hostlist);
397 h->status = hstatus_unknown;
398 h->why = hwhy_unknown;
403 /* There is nothing more to do other than to queue the address for the
404 local transport, filling in any uid/gid. This can be done by the common
405 rf_queue_add() function. */
407 addr->transport = transport;
408 return rf_queue_add(addr, addr_local, addr_remote, rblock, pw)?
412 /* There is either no transport (verify_only) or a remote transport. A host
413 list is mandatory in either case, except when verifying, in which case the
414 address is just accepted. */
416 if (hostlist[0] == 0)
418 if (verify != v_none) goto ROUTED;
419 addr->message = string_sprintf("error in %s router: no host(s) specified "
420 "for domain %s", rblock->name, domain);
421 log_write(0, LOG_MAIN, "%s", addr->message);
425 /* Otherwise we finish the routing here by building a chain of host items
426 for the list of configured hosts, and then finding their addresses. */
428 host_build_hostlist(&(addr->host_list), hostlist, randomize);
429 rc = rf_lookup_hostlist(rblock, addr, rblock->ignore_target_hosts, lookup_type,
430 ob->hff_code, addr_new);
431 if (rc != OK) return rc;
433 /* If host_find_failed is set to "ignore", it is possible for all the hosts to
434 be ignored, in which case we will end up with an empty host list. What happens
435 is controlled by host_all_ignored. */
437 if (addr->host_list == NULL)
440 DEBUG(D_route) debug_printf("host_find_failed ignored every host\n");
441 if (ob->hai_code == hff_decline) return DECLINE;
442 if (ob->hai_code == hff_pass) return PASS;
444 for (i = 0; i < hff_count; i++)
445 if (ob->hai_code == hff_codes[i]) break;
447 addr->message = string_sprintf("lookup failed for all hosts in %s router: "
448 "host_find_failed=ignore host_all_ignored=%s", rblock->name, hff_names[i]);
450 if (ob->hai_code == hff_defer) return DEFER;
451 if (ob->hai_code == hff_fail) return FAIL;
453 addr->special_action = SPECIAL_FREEZE;
457 /* Finally, since we have done all the routing here, there must be a transport
458 defined for these hosts. It will be a remote one, as a local transport is
459 dealt with above. However, we don't need one if verifying only. */
461 if (transport == NULL && verify == v_none)
463 log_write(0, LOG_MAIN, "Error in %s router: no transport defined",
465 addr->message = US"error in router: transport missing";
469 /* Fill in the transport, queue for remote delivery. The yield of
470 rf_queue_add() is always TRUE for a remote transport. */
474 addr->transport = transport;
475 (void)rf_queue_add(addr, addr_local, addr_remote, rblock, NULL);
479 /* End of routers/manualroute.c */