9 #include <trust_router/tr_name.h>
10 #include <trp_internal.h>
12 #include <trp_ptable.h>
13 #include <trp_rtable.h>
17 static int trps_destructor(void *object)
19 TRPS_INSTANCE *trps=talloc_get_type_abort(object, TRPS_INSTANCE);
20 if (trps->rtable!=NULL)
21 trp_rtable_free(trps->rtable);
25 TRPS_INSTANCE *trps_new (TALLOC_CTX *mem_ctx)
27 TRPS_INSTANCE *trps=talloc(mem_ctx, TRPS_INSTANCE);
34 trps->update_interval=(struct timeval){0,0};
35 trps->sweep_interval=(struct timeval){0,0};
38 trps->mq=tr_mq_new(trps);
40 /* failed to allocate mq */
46 if (trps_init_rtable(trps) != TRP_SUCCESS) {
47 /* failed to allocate rtable */
52 talloc_set_destructor((void *)trps, trps_destructor);
57 /* create a new route table, first discarding an old one if necessary */
58 TRP_RC trps_init_rtable(TRPS_INSTANCE *trps)
60 if (trps->rtable != NULL) {
61 trp_rtable_free(trps->rtable);
65 trps->rtable=trp_rtable_new();
66 if (trps->rtable==NULL) {
72 void trps_clear_rtable(TRPS_INSTANCE *trps)
74 trp_rtable_clear(trps->rtable);
77 void trps_free (TRPS_INSTANCE *trps)
83 TR_MQ_MSG *trps_mq_pop(TRPS_INSTANCE *trps)
85 return tr_mq_pop(trps->mq);
88 void trps_mq_add(TRPS_INSTANCE *trps, TR_MQ_MSG *msg)
90 tr_mq_add(trps->mq, msg);
93 unsigned int trps_get_connect_interval(TRPS_INSTANCE *trps)
95 return trps->connect_interval.tv_sec;
98 void trps_set_connect_interval(TRPS_INSTANCE *trps, unsigned int interval)
100 trps->connect_interval.tv_sec=interval;
101 trps->connect_interval.tv_usec=0;
104 unsigned int trps_get_update_interval(TRPS_INSTANCE *trps)
106 return trps->update_interval.tv_sec;
109 void trps_set_update_interval(TRPS_INSTANCE *trps, unsigned int interval)
111 trps->update_interval.tv_sec=interval;
112 trps->update_interval.tv_usec=0;
115 unsigned int trps_get_sweep_interval(TRPS_INSTANCE *trps)
117 return trps->sweep_interval.tv_sec;
120 void trps_set_sweep_interval(TRPS_INSTANCE *trps, unsigned int interval)
122 trps->sweep_interval.tv_sec=interval;
123 trps->sweep_interval.tv_usec=0;
126 void trps_set_ptable(TRPS_INSTANCE *trps, TRP_PTABLE *ptable)
128 if (trps->ptable!=NULL)
129 trp_ptable_free(trps->ptable);
133 TRPC_INSTANCE *trps_find_trpc(TRPS_INSTANCE *trps, TRP_PEER *peer)
135 TRPC_INSTANCE *cur=NULL;
137 TR_NAME *peer_servicename=trp_peer_get_servicename(peer);
139 for (cur=trps->trpc; cur!=NULL; cur=trpc_get_next(cur)) {
140 name=trpc_get_gssname(cur);
141 if ((name!=NULL) && (0==tr_name_cmp(peer_servicename, name))) {
148 void trps_add_connection(TRPS_INSTANCE *trps, TRP_CONNECTION *new)
150 if (trps->conn==NULL)
153 trp_connection_append(trps->conn, new);
155 talloc_steal(trps, new);
158 /* ok to call more than once; guarantees connection no longer in the list.
159 * Caller is responsible for freeing the removed element afterwards. */
160 void trps_remove_connection(TRPS_INSTANCE *trps, TRP_CONNECTION *remove)
162 trps->conn=trp_connection_remove(trps->conn, remove);
165 void trps_add_trpc(TRPS_INSTANCE *trps, TRPC_INSTANCE *trpc)
167 if (trps->trpc==NULL)
170 trpc_append(trps->trpc, trpc);
172 talloc_steal(trps, trpc);
175 /* ok to call more than once; guarantees trpc no longer in the list.
176 * Caller is responsible for freeing the removed element afterwards. */
177 void trps_remove_trpc(TRPS_INSTANCE *trps, TRPC_INSTANCE *remove)
179 trps->trpc=trpc_remove(trps->trpc, remove);
182 TRP_RC trps_send_msg(TRPS_INSTANCE *trps, TRP_PEER *peer, const char *msg)
184 TALLOC_CTX *tmp_ctx=talloc_new(NULL);
185 TR_MQ_MSG *mq_msg=NULL;
188 TRPC_INSTANCE *trpc=NULL;
190 /* get the connection for this peer */
191 trpc=trps_find_trpc(trps, peer);
192 /* instead, let's let that happen and then clear the queue when an attempt to
195 tr_warning("trps_send_msg: skipping message queued for missing TRP client entry.");
197 mq_msg=tr_mq_msg_new(tmp_ctx, TR_MQMSG_TRPC_SEND, TR_MQ_PRIO_NORMAL);
198 msg_dup=talloc_strdup(mq_msg, msg); /* get local copy in mq_msg context */
199 tr_mq_msg_set_payload(mq_msg, msg_dup, NULL); /* no need for a free() func */
200 trpc_mq_add(trpc, mq_msg);
203 talloc_free(tmp_ctx);
207 static int trps_listen (TRPS_INSTANCE *trps, int port)
214 struct sockaddr_storage storage;
215 struct sockaddr_in in4;
218 struct sockaddr_in *saddr = (struct sockaddr_in *) &addr.in4;
220 saddr->sin_port = htons (port);
221 saddr->sin_family = AF_INET;
222 saddr->sin_addr.s_addr = INADDR_ANY;
224 if (0 > (conn = socket (AF_INET, SOCK_STREAM, 0)))
227 setsockopt(conn, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval));
229 if (0 > (rc = bind (conn, (struct sockaddr *) saddr, sizeof(struct sockaddr_in))))
232 if (0 > (rc = listen(conn, 512)))
235 tr_debug("trps_listen: TRP Server listening on port %d", port);
239 /* get the currently selected route if available */
240 TRP_ROUTE *trps_get_route(TRPS_INSTANCE *trps, TR_NAME *comm, TR_NAME *realm, TR_NAME *peer)
242 return trp_rtable_get_entry(trps->rtable, comm, realm, peer);
245 TRP_ROUTE *trps_get_selected_route(TRPS_INSTANCE *trps, TR_NAME *comm, TR_NAME *realm)
247 tr_debug("trps_get_selected_route: entered. trps=%p, comm=%p, realm=%p", trps, comm, realm);
248 return trp_rtable_get_selected_entry(trps->rtable, comm, realm);
251 /* copy the result if you want to keep it */
252 TR_NAME *trps_get_next_hop(TRPS_INSTANCE *trps, TR_NAME *comm, TR_NAME *realm)
254 TRP_ROUTE *route=trps_get_selected_route(trps, comm, realm);
258 return trp_route_get_next_hop(route);
262 /* mark a route as retracted */
263 static void trps_retract_route(TRPS_INSTANCE *trps, TRP_ROUTE *entry)
265 trp_route_set_metric(entry, TRP_METRIC_INFINITY);
266 trp_route_set_triggered(entry, 1);
269 /* is this route retracted? */
270 static int trps_route_retracted(TRPS_INSTANCE *trps, TRP_ROUTE *entry)
272 return (trp_metric_is_infinite(trp_route_get_metric(entry)));
275 static TRP_RC trps_read_message(TRPS_INSTANCE *trps, TRP_CONNECTION *conn, TR_MSG **msg)
282 tr_debug("trps_read_message: started");
283 if (err = gsscon_read_encrypted_token(trp_connection_get_fd(conn),
284 *(trp_connection_get_gssctx(conn)),
287 tr_debug("trps_read_message: error");
293 tr_debug("trps_read_message(): message received, %u bytes.", (unsigned) buflen);
294 tr_debug("trps_read_message(): %.*s", buflen, buf);
296 *msg=tr_msg_decode(buf, buflen);
301 peer=trp_connection_get_peer(conn);
302 /* verify we received a message we support, otherwise drop it now */
303 switch (tr_msg_get_msg_type(*msg)) {
305 trp_upd_set_peer(tr_msg_get_trp_upd(*msg), tr_dup_name(peer));
309 trp_req_set_peer(tr_msg_get_trp_req(*msg), tr_dup_name(peer));
313 tr_debug("trps_read_message: received unsupported message from %.*s", peer->len, peer->buf);
314 tr_msg_free_decoded(*msg);
316 return TRP_UNSUPPORTED;
322 int trps_get_listener(TRPS_INSTANCE *trps,
323 TRPS_MSG_FUNC msg_handler,
324 TRP_AUTH_FUNC auth_handler,
325 const char *hostname,
331 if (0 > (listen = trps_listen(trps, port))) {
333 if (0 == strerror_r(errno, errbuf, 256)) {
334 tr_debug("trps_get_listener: Error opening port %d: %s.", port, errbuf);
336 tr_debug("trps_get_listener: Unknown error openining port %d.", port);
341 /* opening port succeeded */
342 tr_debug("trps_get_listener: Opened port %d.", port);
344 /* make this socket non-blocking */
345 if (0 != fcntl(listen, F_SETFL, O_NONBLOCK)) {
346 tr_debug("trps_get_listener: Error setting O_NONBLOCK.");
353 /* store the caller's request handler & cookie */
354 trps->msg_handler = msg_handler;
355 trps->auth_handler = auth_handler;
356 trps->hostname = talloc_strdup(trps, hostname);
358 trps->cookie = cookie;
364 TRP_RC trps_authorize_connection(TRPS_INSTANCE *trps, TRP_CONNECTION *conn)
366 /* try to establish a GSS context */
367 if (0!=trp_connection_auth(conn, trps->auth_handler, trps->cookie)) {
368 tr_notice("trps_authorize_connection: failed to authorize connection");
369 trp_connection_close(conn);
372 tr_notice("trps_authorize_connection: authorized connection");
376 void trps_handle_connection(TRPS_INSTANCE *trps, TRP_CONNECTION *conn)
381 /* loop as long as the connection exists */
382 while (trp_connection_get_status(conn)==TRP_CONNECTION_UP) {
383 rc=trps_read_message(trps, conn, &msg);
386 trps->msg_handler(trps, conn, msg); /* send the TR_MSG off to the callback */
390 trp_connection_close(conn);
394 tr_debug("trps_handle_connection: trps_read_message failed (%d)", rc);
398 tr_debug("trps_handle_connection: connection closed.");
401 static TRP_RC trps_validate_update(TRPS_INSTANCE *trps, TRP_UPD *upd)
404 tr_notice("trps_validate_update: null TRP update.");
408 if (trp_upd_get_inforec(upd)==NULL) {
409 tr_notice("trps_validate_update: received TRP update with no info records.");
413 if (trp_upd_get_peer(upd)==NULL) {
414 tr_notice("trps_validate_update: received TRP update without origin peer information.");
421 /* ensure that the update could be accepted if feasible */
422 static TRP_RC trps_validate_inforec(TRPS_INSTANCE *trps, TRP_INFOREC *rec)
424 switch(trp_inforec_get_type(rec)) {
425 case TRP_INFOREC_TYPE_ROUTE:
426 if ((trp_inforec_get_comm(rec)==NULL)
427 || (trp_inforec_get_realm(rec)==NULL)
428 || (trp_inforec_get_trust_router(rec)==NULL)
429 || (trp_inforec_get_next_hop(rec)==NULL)) {
430 tr_debug("trps_validate_inforec: missing record info.");
434 /* check for valid metric */
435 if (trp_metric_is_invalid(trp_inforec_get_metric(rec))) {
436 tr_debug("trps_validate_inforec: invalid metric (%u).", trp_inforec_get_metric(rec));
440 /* check for valid interval */
441 if (trp_inforec_get_interval(rec)==TRP_INTERVAL_INVALID) {
442 tr_debug("trps_validate_inforec: invalid interval.");
448 tr_notice("trps_validate_inforec: unsupported record type.");
449 return TRP_UNSUPPORTED;
455 /* link cost to a peer */
456 static unsigned int trps_cost(TRPS_INSTANCE *trps, TR_NAME *peer)
461 static unsigned int trps_advertised_metric(TRPS_INSTANCE *trps, TR_NAME *comm, TR_NAME *realm, TR_NAME *peer)
463 TRP_ROUTE *entry=trp_rtable_get_entry(trps->rtable, comm, realm, peer);
465 return TRP_METRIC_INFINITY;
466 return trp_route_get_metric(entry) + trps_cost(trps, peer);
469 static int trps_check_feasibility(TRPS_INSTANCE *trps, TRP_INFOREC *rec)
471 unsigned int rec_metric=trp_inforec_get_metric(rec);
472 unsigned int new_metric=0;
473 unsigned int current_metric=0;
474 TR_NAME *next_hop=NULL;
476 /* we check these in the validation stage, but just in case... */
477 if (trp_metric_is_invalid(rec_metric))
480 /* retractions (aka infinite metrics) are always feasible */
481 if (trp_metric_is_infinite(rec_metric))
484 /* updates from our current next hop are always feasible*/
485 next_hop=trps_get_next_hop(trps,
486 trp_inforec_get_comm(rec),
487 trp_inforec_get_realm(rec));;
489 && (0==tr_name_cmp(next_hop,trp_inforec_get_next_hop(rec)))) {
494 /* compare the existing metric we advertise to what we would advertise
495 * if we accept this update */
496 current_metric=trps_advertised_metric(trps,
497 trp_inforec_get_comm(rec),
498 trp_inforec_get_realm(rec),
499 trp_inforec_get_next_hop(rec));
500 new_metric=rec_metric + trps_cost(trps, trp_inforec_get_next_hop(rec));
501 if (new_metric <= current_metric)
507 /* uses memory pointed to by *ts, also returns that value. On error, its contents are {0,0} */
508 static struct timespec *trps_compute_expiry(TRPS_INSTANCE *trps, unsigned int interval, struct timespec *ts)
510 const unsigned int small_factor=3; /* how many intervals we wait before expiring */
511 if (0!=clock_gettime(CLOCK_REALTIME, ts)) {
512 tr_err("trps_compute_expiry: could not read realtime clock.");
516 ts->tv_sec += small_factor*interval;
520 static TRP_RC trps_accept_update(TRPS_INSTANCE *trps, TRP_UPD *upd, TRP_INFOREC *rec)
522 TRP_ROUTE *entry=NULL;
524 entry=trp_rtable_get_entry(trps->rtable,
525 trp_inforec_get_comm(rec),
526 trp_inforec_get_realm(rec),
527 trp_inforec_get_next_hop(rec));
529 entry=trp_route_new(NULL);
531 tr_err("trps_accept_update: unable to allocate new entry.");
535 trp_route_set_comm(entry, trp_inforec_dup_comm(rec));
536 trp_route_set_realm(entry, trp_inforec_dup_realm(rec));
537 trp_route_set_peer(entry, trp_upd_dup_peer(upd));
538 trp_route_set_trust_router(entry, trp_inforec_dup_trust_router(rec));
539 trp_route_set_next_hop(entry, trp_inforec_dup_next_hop(rec));
540 if ((trp_route_get_comm(entry)==NULL)
541 ||(trp_route_get_realm(entry)==NULL)
542 ||(trp_route_get_peer(entry)==NULL)
543 ||(trp_route_get_trust_router(entry)==NULL)
544 ||(trp_route_get_next_hop(entry)==NULL)) {
545 /* at least one field could not be allocated */
546 tr_err("trps_accept_update: unable to allocate all fields for entry.");
547 trp_route_free(entry);
550 trp_rtable_add(trps->rtable, entry);
553 /* We now have an entry in the table, whether it's new or not. Update metric and expiry, unless
554 * the metric is infinity. An infinite metric can only occur here if we just retracted an existing
555 * route (we never accept retractions as new routes), so there is no risk of leaving the expiry
556 * time unset on a new route entry. */
557 tr_debug("trps_accept_update: accepting route update.");
558 trp_route_set_metric(entry, trp_inforec_get_metric(rec));
559 trp_route_set_interval(entry, trp_inforec_get_interval(rec));
561 /* check whether the trust router has changed */
562 if (0!=tr_name_cmp(trp_route_get_trust_router(entry),
563 trp_inforec_get_trust_router(rec))) {
564 /* The name changed. Set this route as triggered. */
565 tr_debug("trps_accept_update: trust router for route changed.");
566 trp_route_set_triggered(entry, 1);
567 trp_route_set_trust_router(entry, trp_inforec_dup_trust_router(rec)); /* frees old name */
569 if (!trps_route_retracted(trps, entry)) {
570 tr_debug("trps_accept_update: route not retracted, setting expiry timer.");
571 trp_route_set_expiry(entry, trps_compute_expiry(trps,
572 trp_route_get_interval(entry),
573 trp_route_get_expiry(entry)));
578 static TRP_RC trps_handle_update(TRPS_INSTANCE *trps, TRP_UPD *upd)
581 TRP_INFOREC *rec=NULL;
582 TRP_ROUTE *route=NULL;
584 if (trps_validate_update(trps, upd) != TRP_SUCCESS) {
585 tr_notice("trps_handle_update: received invalid TRP update.");
589 for (rec=trp_upd_get_inforec(upd); rec!=NULL; rec=trp_inforec_get_next(rec)) {
590 /* validate/sanity check the record update */
591 if (trps_validate_inforec(trps, rec) != TRP_SUCCESS) {
592 tr_notice("trps_handle_update: invalid record in TRP update, discarding entire update.");
597 for (rec=trp_upd_get_inforec(upd); rec!=NULL; rec=trp_inforec_get_next(rec)) {
598 /* determine feasibility */
599 feas=trps_check_feasibility(trps, rec);
600 tr_debug("trps_handle_update: record feasibility=%d", feas);
602 /* do we have an existing route? */
603 route=trps_get_route(trps,
604 trp_inforec_get_comm(rec),
605 trp_inforec_get_realm(rec),
606 trp_upd_get_peer(upd));
608 /* there was a route table entry already */
609 tr_debug("trps_handle_updates: route entry already exists.");
611 /* Update is feasible. Accept it. */
612 trps_accept_update(trps, upd, rec);
614 /* Update is infeasible. Ignore it unless the trust router has changed. */
615 if (0!=tr_name_cmp(trp_route_get_trust_router(route),
616 trp_inforec_get_trust_router(rec))) {
617 /* the trust router associated with the route has changed, treat update as a retraction */
618 trps_retract_route(trps, route);
622 /* No existing route table entry. Ignore it unless it is feasible and not a retraction. */
623 tr_debug("trps_handle_update: no route entry exists yet.");
624 if (feas && trp_metric_is_finite(trp_inforec_get_metric(rec)))
625 trps_accept_update(trps, upd, rec);
631 static TRP_RC trps_validate_request(TRPS_INSTANCE *trps, TRP_REQ *req)
634 tr_notice("trps_validate_request: null TRP request.");
638 if (trp_req_get_comm(req)==NULL) {
639 tr_notice("trps_validate_request: received TRP request with null community.");
643 if (trp_req_get_realm(req)==NULL) {
644 tr_notice("trps_validate_request: received TRP request with null realm.");
648 if (trp_req_get_peer(req)==NULL) {
649 tr_notice("trps_validate_request: received TRP request without origin peer information.");
656 /* choose the best route to comm/realm, optionally excluding routes to a particular peer */
657 static TRP_ROUTE *trps_find_best_route(TRPS_INSTANCE *trps,
660 TR_NAME *exclude_peer)
662 TRP_ROUTE **entry=NULL;
663 TRP_ROUTE *best=NULL;
666 unsigned int kk_min=0;
667 unsigned int min_metric=TRP_METRIC_INFINITY;
669 entry=trp_rtable_get_realm_entries(trps->rtable, comm, realm, &n_entry);
670 for (kk=0; kk<n_entry; kk++) {
671 if (trp_route_get_metric(entry[kk]) < min_metric) {
672 if ((exclude_peer==NULL) || (0!=tr_name_cmp(trp_route_get_peer(entry[kk]),
675 min_metric=trp_route_get_metric(entry[kk]);
679 if (trp_metric_is_finite(min_metric))
686 /* TODO: think this through more carefully. At least ought to add hysteresis
687 * to avoid flapping between routers or routes. */
688 TRP_RC trps_update_active_routes(TRPS_INSTANCE *trps)
690 size_t n_comm=0, ii=0;
691 TR_NAME **comm=trp_rtable_get_comms(trps->rtable, &n_comm);
692 size_t n_realm=0, jj=0;
693 TR_NAME **realm=NULL;
694 TRP_ROUTE *best_route=NULL, *cur_route=NULL;
695 unsigned int best_metric=0, cur_metric=0;
697 for (ii=0; ii<n_comm; ii++) {
698 realm=trp_rtable_get_comm_realms(trps->rtable, comm[ii], &n_realm);
699 for (jj=0; jj<n_realm; jj++) {
700 best_route=trps_find_best_route(trps, comm[ii], realm[jj], NULL);
701 if (best_route==NULL)
702 best_metric=TRP_METRIC_INFINITY;
704 best_metric=trp_route_get_metric(best_route);
706 cur_route=trps_get_selected_route(trps, comm[ii], realm[jj]);
707 if (cur_route!=NULL) {
708 cur_metric=trp_route_get_metric(cur_route);
709 if ((best_metric < cur_metric) && (trp_metric_is_finite(best_metric))) {
710 /* The new route has a lower metric than the previous, and is finite. Accept. */
711 trp_route_set_selected(cur_route, 0);
712 trp_route_set_selected(best_route, 1);
713 } else if (!trp_metric_is_finite(cur_metric)) /* rejects infinite or invalid metrics */
714 trp_route_set_selected(cur_route, 0);
715 } else if (trp_metric_is_finite(best_metric)) {
716 trp_route_set_selected(best_route, 1);
721 realm=NULL; n_realm=0;
730 /* true if curtime >= expiry */
731 static int trps_expired(struct timespec *expiry, struct timespec *curtime)
733 return ((curtime->tv_sec > expiry->tv_sec)
734 || ((curtime->tv_sec == expiry->tv_sec)
735 &&(curtime->tv_nsec > expiry->tv_nsec)));
738 /* Sweep for expired routes. For each expired route, if its metric is infinite, the route is flushed.
739 * If its metric is finite, the metric is set to infinite and the route's expiration time is updated. */
740 TRP_RC trps_sweep_routes(TRPS_INSTANCE *trps)
742 struct timespec sweep_time={0,0};
743 TRP_ROUTE **entry=NULL;
747 /* use a single time for the entire sweep */
748 if (0!=clock_gettime(CLOCK_REALTIME, &sweep_time)) {
749 tr_err("trps_sweep_routes: could not read realtime clock.");
751 sweep_time.tv_nsec=0;
755 entry=trp_rtable_get_entries(trps->rtable, &n_entry); /* must talloc_free *entry */
757 /* loop over the entries */
758 for (ii=0; ii<n_entry; ii++) {
759 if (!trp_route_is_local(entry[ii]) && trps_expired(trp_route_get_expiry(entry[ii]), &sweep_time)) {
760 tr_debug("trps_sweep_routes: route expired.");
761 if (!trp_metric_is_finite(trp_route_get_metric(entry[ii]))) {
763 tr_debug("trps_sweep_routes: metric was infinity, flushing route.");
764 trp_rtable_remove(trps->rtable, entry[ii]); /* entry[ii] is no longer valid */
767 /* set metric to infinity and reset timer */
768 tr_debug("trps_sweep_routes: setting metric to infinity and resetting expiry.");
769 trp_route_set_metric(entry[ii], TRP_METRIC_INFINITY);
770 trp_route_set_expiry(entry[ii], trps_compute_expiry(trps,
771 trp_route_get_interval(entry[ii]),
772 trp_route_get_expiry(entry[ii])));
781 /* select the correct route to comm/realm to be announced to peer */
782 static TRP_ROUTE *trps_select_realm_update(TRPS_INSTANCE *trps, TR_NAME *comm, TR_NAME *realm, TR_NAME *peer_gssname)
786 /* Take the currently selected route unless it is through the peer we're sending the update to.
787 * I.e., enforce the split horizon rule. */
788 route=trp_rtable_get_selected_entry(trps->rtable, comm, realm);
790 /* No selected route, this should only happen if the only route has been retracted,
791 * in which case we do not want to advertise it. */
794 tr_debug("trps_select_realm_update: %s vs %s", peer_gssname->buf,
795 trp_route_get_peer(route)->buf);
796 if (0==tr_name_cmp(peer_gssname, trp_route_get_peer(route))) {
797 tr_debug("trps_select_realm_update: matched, finding alternate route");
798 /* the selected entry goes through the peer we're reporting to, choose an alternate */
799 route=trps_find_best_route(trps, comm, realm, peer_gssname);
800 if ((route==NULL) || (!trp_metric_is_finite(trp_route_get_metric(route))))
801 return NULL; /* don't advertise a nonexistent or retracted route */
806 /* returns an array of pointers to updates (*not* an array of updates). Returns number of entries
807 * via n_update parameter. (The allocated space will generally be larger than required, see note in
808 * the code.) If triggered is set, sends only triggered updates. */
809 static TRP_ROUTE **trps_select_updates_for_peer(TALLOC_CTX *memctx,
811 TR_NAME *peer_gssname,
816 TR_NAME **comm=trp_rtable_get_comms(trps->rtable, &n_comm);
817 TR_NAME **realm=NULL;
820 TRP_ROUTE *best=NULL;
821 TRP_ROUTE **result=NULL;
824 /* Need to allocate space for the results. For simplicity, we just allocate a block
825 * with space for every route table entry to be returned. This is guaranteed to be large
826 * enough. If the routing table gets very large, this may be wasteful, but that seems
827 * unlikely to be significant in the near future. */
828 result=talloc_array(memctx, TRP_ROUTE *, trp_rtable_size(trps->rtable));
835 for (ii=0; ii<n_comm; ii++) {
836 realm=trp_rtable_get_comm_realms(trps->rtable, comm[ii], &n_realm);
837 for (jj=0; jj<n_realm; jj++) {
838 best=trps_select_realm_update(trps, comm[ii], realm[jj], peer_gssname);
839 /* If we found a route, add it to the list. If triggered!=0, then only
840 * add triggered routes. */
841 if ((best!=NULL) && ((!triggered) || trp_route_is_triggered(best)))
842 result[n_used++]=best;
857 static unsigned int trps_metric_add(unsigned int m1, unsigned int m2)
859 if (trp_metric_is_invalid(m1) || trp_metric_is_invalid(m2))
860 return TRP_METRIC_INVALID;
862 if (trp_metric_is_infinite(m1) || trp_metric_is_infinite(m2))
863 return TRP_METRIC_INFINITY;
865 if (trp_metric_is_finite(m1+m2))
868 return TRP_METRIC_INFINITY;
871 /* convert an rentry into a new trp update info record */
872 static TRP_INFOREC *trps_route_to_inforec(TALLOC_CTX *mem_ctx, TRPS_INSTANCE *trps, TRP_ROUTE *route)
874 TRP_INFOREC *rec=trp_inforec_new(mem_ctx, TRP_INFOREC_TYPE_ROUTE);
875 unsigned int linkcost=0;
878 if (trp_route_is_local(route))
881 linkcost=trp_peer_get_linkcost(trps_get_peer_by_gssname(trps,
882 trp_route_get_peer(route)));
885 /* Note that we leave the next hop empty since the recipient fills that in.
886 * This is where we add the link cost (currently always 1) to the next peer. */
887 if ((trp_inforec_set_comm(rec, trp_route_dup_comm(route)) != TRP_SUCCESS)
888 ||(trp_inforec_set_realm(rec, trp_route_dup_realm(route)) != TRP_SUCCESS)
889 ||(trp_inforec_set_trust_router(rec, trp_route_dup_trust_router(route)) != TRP_SUCCESS)
890 ||(trp_inforec_set_metric(rec,
891 trps_metric_add(trp_route_get_metric(route),
892 linkcost)) != TRP_SUCCESS)
893 ||(trp_inforec_set_interval(rec, trps_get_update_interval(trps)) != TRP_SUCCESS)) {
894 tr_err("trps_route_to_inforec: error creating route update.");
902 /* all routes to a single peer, unless comm/realm are specified (both or neither must be NULL) */
903 static TRP_RC trps_update_one_peer(TRPS_INSTANCE *trps,
905 TRP_UPDATE_TYPE update_type,
909 TALLOC_CTX *tmp_ctx=talloc_new(NULL);
910 TR_MSG msg; /* not a pointer! */
912 TRP_ROUTE **update_list=NULL;
913 TRP_INFOREC *rec=NULL;
914 size_t n_updates=0, ii=0;
917 TR_NAME *peer_label=trp_peer_get_label(peer);
919 switch (update_type) {
920 case TRP_UPDATE_TRIGGERED:
921 tr_debug("trps_update_one_peer: preparing triggered route update for %.*s",
922 peer_label->len, peer_label->buf);
924 case TRP_UPDATE_SCHEDULED:
925 tr_debug("trps_update_one_peer: preparing scheduled route update for %.*s",
926 peer_label->len, peer_label->buf);
928 case TRP_UPDATE_REQUESTED:
929 tr_debug("trps_update_one_peer: preparing requested route update for %.*s",
930 peer_label->len, peer_label->buf);
933 /* do not fill in peer, recipient does that */
934 if ((comm==NULL) && (realm==NULL)) {
936 update_list=trps_select_updates_for_peer(tmp_ctx,
939 update_type==TRP_UPDATE_TRIGGERED,
941 } else if ((comm!=NULL) && (realm!=NULL)) {
942 /* a single community/realm was requested */
943 update_list=talloc(tmp_ctx, TRP_ROUTE *);
944 if (update_list==NULL) {
945 tr_err("trps_update_one_peer: could not allocate update_list.");
949 *update_list=trps_select_realm_update(trps, comm, realm, peer_label);
950 if (*update_list==NULL) {
951 /* we have no actual update to send back, MUST send a retraction */
952 tr_debug("trps_update_one_peer: community/realm without route requested, sending mandatory retraction.");
953 *update_list=trp_route_new(update_list);
954 trp_route_set_comm(*update_list, tr_dup_name(comm));
955 trp_route_set_realm(*update_list, tr_dup_name(realm));
956 trp_route_set_peer(*update_list, tr_new_name(""));
957 trp_route_set_metric(*update_list, TRP_METRIC_INFINITY);
958 trp_route_set_trust_router(*update_list, tr_new_name(""));
959 trp_route_set_next_hop(*update_list, tr_new_name(""));
963 tr_err("trps_update_one_peer: error: only comm or realm was specified.");
967 if ((n_updates>0) && (update_list!=NULL)) {
968 tr_debug("trps_update_one_peer: sending %u update records.", (unsigned int)n_updates);
969 upd=trp_upd_new(tmp_ctx);
971 for (ii=0; ii<n_updates; ii++) {
972 rec=trps_route_to_inforec(tmp_ctx, trps, update_list[ii]);
974 tr_err("trps_update_one_peer: could not create all update records.");
978 trp_upd_add_inforec(upd, rec);
980 talloc_free(update_list);
983 /* now encode the update message */
984 tr_msg_set_trp_upd(&msg, upd);
985 encoded=tr_msg_encode(&msg);
987 tr_err("trps_update_one_peer: error encoding update.");
992 tr_debug("trps_update_one_peer: adding message to queue.");
993 if (trps_send_msg(trps, peer, encoded) != TRP_SUCCESS)
994 tr_err("trps_update_one_peer: error queueing update.");
996 tr_debug("trps_update_one_peer: update queued successfully.");
998 tr_msg_free_encoded(encoded);
1005 talloc_free(tmp_ctx);
1009 /* all routes to all peers */
1010 TRP_RC trps_update(TRPS_INSTANCE *trps, TRP_UPDATE_TYPE update_type)
1012 TALLOC_CTX *tmp_ctx=talloc_new(NULL);
1013 TRP_PTABLE_ITER *iter=trp_ptable_iter_new(tmp_ctx);
1014 TRP_PEER *peer=NULL;
1015 TRP_RC rc=TRP_SUCCESS;
1017 if (trps->ptable==NULL)
1018 return TRP_SUCCESS; /* no peers, nothing to do */
1021 tr_err("trps_update: failed to allocate peer table iterator.");
1022 talloc_free(tmp_ctx);
1026 for (peer=trp_ptable_iter_first(iter, trps->ptable);
1027 peer!=NULL && rc==TRP_SUCCESS;
1028 peer=trp_ptable_iter_next(iter))
1030 if (!trps_peer_connected(trps, peer)) {
1031 TR_NAME *peer_label=trp_peer_get_label(peer);
1032 tr_debug("trps_update: no TRP connection to %.*s, skipping.",
1033 peer_label->len, peer_label->buf);
1036 rc=trps_update_one_peer(trps, peer, update_type, NULL, NULL);
1039 trp_ptable_iter_free(iter);
1040 trp_rtable_clear_triggered(trps->rtable); /* don't re-send triggered updates */
1041 talloc_free(tmp_ctx);
1045 TRP_RC trps_add_route(TRPS_INSTANCE *trps, TRP_ROUTE *route)
1047 trp_rtable_add(trps->rtable, route); /* should return status */
1051 /* steals the peer object */
1052 TRP_RC trps_add_peer(TRPS_INSTANCE *trps, TRP_PEER *peer)
1054 if (trps->ptable==NULL) {
1055 trps->ptable=trp_ptable_new(trps);
1056 if (trps->ptable==NULL)
1059 return trp_ptable_add(trps->ptable, peer);
1062 TRP_PEER *trps_get_peer_by_gssname(TRPS_INSTANCE *trps, TR_NAME *gssname)
1064 if (trps->ptable==NULL)
1067 return trp_ptable_find_gss_name(trps->ptable, gssname);
1070 TRP_PEER *trps_get_peer_by_servicename(TRPS_INSTANCE *trps, TR_NAME *servicename)
1072 if (trps->ptable==NULL)
1075 return trp_ptable_find_servicename(trps->ptable, servicename);
1078 int trps_peer_connected(TRPS_INSTANCE *trps, TRP_PEER *peer)
1080 TRPC_INSTANCE *trpc=trps_find_trpc(trps, peer);
1084 if (trpc_get_status(trpc)==TRP_CONNECTION_UP)
1091 static TRP_RC trps_handle_request(TRPS_INSTANCE *trps, TRP_REQ *req)
1094 TR_NAME *realm=NULL;
1096 tr_debug("trps_handle_request: handling TRP request.");
1098 if (trps_validate_request(trps, req) != TRP_SUCCESS) {
1099 tr_notice("trps_handle_request: received invalid TRP request.");
1103 if (!trp_req_is_wildcard(req)) {
1104 comm=trp_req_get_comm(req);
1105 realm=trp_req_get_realm(req);
1106 tr_debug("trps_handle_request: route for %.*s/%.*s requested.",
1107 comm->len, comm->buf, realm->len, realm->buf);
1109 tr_debug("trps_handle_request: all routes requested.");
1110 /* leave comm/realm NULL */
1112 return trps_update_one_peer(trps,
1113 trps_get_peer_by_gssname(trps, trp_req_get_peer(req)),
1114 TRP_UPDATE_REQUESTED,
1120 TRP_RC trps_handle_tr_msg(TRPS_INSTANCE *trps, TR_MSG *tr_msg)
1122 TRP_RC rc=TRP_ERROR;
1124 switch (tr_msg_get_msg_type(tr_msg)) {
1126 rc=trps_handle_update(trps, tr_msg_get_trp_upd(tr_msg));
1127 if (rc==TRP_SUCCESS) {
1128 rc=trps_update_active_routes(trps);
1129 trps_update(trps, TRP_UPDATE_TRIGGERED); /* send any triggered routes */
1134 rc=trps_handle_request(trps, tr_msg_get_trp_req(tr_msg));
1138 /* unknown error or one we don't care about (e.g., TID messages) */
1143 /* send wildcard route request to a peer */
1144 TRP_RC trps_wildcard_route_req(TRPS_INSTANCE *trps, TR_NAME *peer_servicename)
1146 TALLOC_CTX *tmp_ctx=talloc_new(NULL);
1147 TRP_PEER *peer=trps_get_peer_by_servicename(trps, peer_servicename);
1148 TR_MSG msg; /* not a pointer */
1149 TRP_REQ *req=trp_req_new(tmp_ctx);
1151 TRP_RC rc=TRP_ERROR;
1154 tr_err("trps_wildcard_route_req: unknown peer (%.*s).", peer_servicename->len, peer_servicename->buf);
1158 if ((req==NULL) || (trp_req_make_wildcard(req)!=TRP_SUCCESS)) {
1159 tr_err("trps_wildcard_route_req: unable to create wildcard TRP request.");
1164 tr_msg_set_trp_req(&msg, req);
1165 encoded=tr_msg_encode(&msg);
1166 if (encoded==NULL) {
1167 tr_err("trps_wildcard_route_req: error encoding wildcard TRP request.");
1172 tr_debug("trps_wildcard_route_req: adding message to queue.");
1173 if (trps_send_msg(trps, peer, encoded) != TRP_SUCCESS) {
1174 tr_err("trps_wildcard_route_req: error queueing request.");
1177 tr_debug("trps_wildcard_route_req: request queued successfully.");
1183 tr_msg_free_encoded(encoded);
1187 talloc_free(tmp_ctx);