2 * request_list.c Hide the handling of the REQUEST list from
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * Copyright 2003-2004 The FreeRADIUS server project
23 static const char rcsid[] = "$Id$";
26 #include "libradius.h"
32 #include "rad_assert.h"
33 #include "request_list.h"
34 #include "radius_snmp.h"
38 * We keep the incoming requests in an array, indexed by ID.
40 * Each array element contains a linked list of containers of
41 * active requests, a count of the number of requests, and a time
42 * at which the first request in the list must be serviced.
44 * Note that we ALSO keep a tree view of the same data, below.
45 * Both views are needed for the server to work optimally.
47 typedef struct REQNODE {
48 struct REQNODE *prev, *next;
52 typedef struct REQUESTINFO {
53 REQNODE *first_request;
54 REQNODE *last_request;
56 time_t last_cleaned_list;
59 static REQUESTINFO request_list[256];
62 * Remember the next request at which we start walking
65 static REQUEST *last_request = NULL;
68 * It MAY make more sense here to key off of the packet ID, just
69 * like the request_list. Then again, saving another 8 lookups
70 * (on average) isn't much of a problem.
72 * The "request_cmp" function keys off of the packet ID first,
73 * so the first 8 layers of the tree will be the fanned-out
74 * tree for packet ID's.
76 static rbtree_t *request_tree;
79 static pthread_mutex_t proxy_mutex;
82 * This is easier than ifdef's throughout the code.
84 #define pthread_mutex_lock(_x)
85 #define pthread_mutex_unlock(_x)
89 * We keep track of packets we're proxying, keyed by
90 * source socket, and destination ip/port, and Id.
92 static rbtree_t *proxy_tree;
95 * We keep track of free/used Id's, by destination ip/port.
97 * We need a different tree than above, because this one is NOT
98 * keyed by Id. Instead, we use this one to allocate Id's.
100 static rbtree_t *proxy_id_tree;
103 * We keep the proxy FD's here. The RADIUS Id's are marked
104 * "allocated" per Id, via a bit per proxy FD.
106 static int proxy_fds[32];
108 static uint32_t proxy_ipaddr;
111 * We can use 256 RADIUS Id's per dst ipaddr/port, per server
112 * socket. So, to allocate them, we key off of dst ipaddr/port,
113 * and then search the RADIUS Id's, looking for an unused socket.
115 * We do NOT key off of socket fd's, here, either. Instead,
116 * we look for a free Id from a sockfd, any sockfd.
118 typedef struct proxy_id_t {
123 * FIXME: Allocate more proxy sockets when this gets full.
126 uint32_t mask; /* of FD's we know about. */
127 uint32_t id[1]; /* really id[256] */
132 * Find a matching entry in the proxy ID tree.
134 static int proxy_id_cmp(const void *one, const void *two)
136 const proxy_id_t *a = one;
137 const proxy_id_t *b = two;
140 * The following comparisons look weird, but it's
141 * the only way to make the comparisons work.
143 if (a->dst_ipaddr < b->dst_ipaddr) return -1;
144 if (a->dst_ipaddr > b->dst_ipaddr) return +1;
146 if (a->dst_port < b->dst_port) return -1;
147 if (a->dst_port > b->dst_port) return +1;
150 * Everything's equal. Say so.
157 * Compare two REQUEST data structures, based on a number
160 static int request_cmp(const void *one, const void *two)
162 const REQUEST *a = one;
163 const REQUEST *b = two;
166 * The following comparisons look weird, but it's
167 * the only way to make the comparisons work.
171 * If the packets didn't arrive on the same socket,
172 * they're not identical, no matter what their src/dst
175 if (a->packet->sockfd < b->packet->sockfd) return -1;
176 if (a->packet->sockfd > b->packet->sockfd) return +1;
178 if (a->packet->id < b->packet->id) return -1;
179 if (a->packet->id > b->packet->id) return +1;
181 if (a->packet->code < b->packet->code) return -1;
182 if (a->packet->code > b->packet->code) return +1;
184 if (a->packet->src_ipaddr < b->packet->src_ipaddr) return -1;
185 if (a->packet->src_ipaddr > b->packet->src_ipaddr) return +1;
187 if (a->packet->src_port < b->packet->src_port) return -1;
188 if (a->packet->src_port > b->packet->src_port) return +1;
191 * Hmm... we may be listening on IPADDR_ANY, in which case
192 * the destination IP is important, too.
194 if (a->packet->dst_ipaddr < b->packet->dst_ipaddr) return -1;
195 if (a->packet->dst_ipaddr > b->packet->dst_ipaddr) return +1;
197 if (a->packet->dst_port < b->packet->dst_port) return -1;
198 if (a->packet->dst_port > b->packet->dst_port) return +1;
201 * Everything's equal. Say so.
207 * Compare two REQUEST data structures, based on a number
208 * of criteria, for proxied packets.
210 static int proxy_cmp(const void *one, const void *two)
212 const REQUEST *a = one;
213 const REQUEST *b = two;
215 rad_assert(a->magic == REQUEST_MAGIC);
216 rad_assert(b->magic == REQUEST_MAGIC);
218 rad_assert(a->proxy != NULL);
219 rad_assert(b->proxy != NULL);
222 * The following code looks unreasonable, but it's
223 * the only way to make the comparisons work.
225 if (a->proxy->sockfd < b->proxy->sockfd) return -1;
226 if (a->proxy->sockfd > b->proxy->sockfd) return +1;
228 if (a->proxy->id < b->proxy->id) return -1;
229 if (a->proxy->id > b->proxy->id) return +1;
232 * We've got to check packet codes, too. But
233 * this should be done later, by someone else...
236 if (a->proxy->dst_ipaddr < b->proxy->dst_ipaddr) return -1;
237 if (a->proxy->dst_ipaddr > b->proxy->dst_ipaddr) return +1;
239 if (a->proxy->dst_port < b->proxy->dst_port) return -1;
240 if (a->proxy->dst_port > b->proxy->dst_port) return +1;
243 * FIXME: Check the Proxy-State attribute, too.
244 * This will help cut down on duplicates.
248 * Everything's equal. Say so.
258 for (i = 0; i < 256; i++) {
259 while (request_list[i].first_request) {
260 rl_delete(request_list[i].first_request->req);
264 rbtree_free(request_tree);
265 rbtree_free(proxy_id_tree);
266 rbtree_free(proxy_tree);
271 * Initialize the request list.
276 * Initialize the request_list[] array.
278 memset(request_list, 0, sizeof(request_list));
280 request_tree = rbtree_create(request_cmp, NULL, 0);
282 rad_assert("FAIL" == NULL);
286 * Create the tree for managing proxied requests and
289 proxy_tree = rbtree_create(proxy_cmp, NULL, 1);
291 rad_assert("FAIL" == NULL);
295 * Create the tree for allocating proxy ID's.
297 proxy_id_tree = rbtree_create(proxy_id_cmp, NULL, 0);
298 if (!proxy_id_tree) {
299 rad_assert("FAIL" == NULL);
302 #ifdef HAVE_PTHREAD_H
304 * For now, always create the mutex.
306 * Later, we can only create it if there are multiple threads.
308 if (pthread_mutex_init(&proxy_mutex, NULL) != 0) {
309 radlog(L_ERR, "FATAL: Failed to initialize proxy mutex: %s",
316 * The Id allocation table is done by bits, so we have
317 * 32 bits per Id. These bits indicate which entry
318 * in the proxy_fds array is used for that Id.
320 * This design allows 256*32 = 8k requests to be
321 * outstanding to a home server, before something goes
326 rad_listen_t *listener;
329 * Mark the Fd's as unused.
331 for (i = 0; i < 32; i++) proxy_fds[i] = -1;
333 for (listener = mainconfig.listen;
335 listener = listener->next) {
336 if (listener->type == RAD_LISTEN_PROXY) {
337 proxy_ipaddr = listener->ipaddr;
338 proxy_fds[listener->fd & 0x1f] = listener->fd;
349 * Delete a request from the proxy trees.
351 static void rl_delete_proxy(REQUEST *request, rbnode_t *node)
353 proxy_id_t myid, *entry;
355 rad_assert(node != NULL);
357 rbtree_delete(proxy_tree, node);
359 myid.dst_ipaddr = request->proxy->dst_ipaddr;
360 myid.dst_port = request->proxy->dst_port;
363 * Find the Id in the array of allocated Id's,
366 entry = rbtree_finddata(proxy_id_tree, &myid);
370 DEBUG3(" proxy: de-allocating %08x:%d %d",
376 * Find the proxy socket associated with this
377 * Id. We loop over all 32 proxy fd's, but we
378 * partially index by proxy fd's, which means
379 * that we almost always break out of the loop
382 for (i = 0; i < 32; i++) {
385 offset = (request->proxy->sockfd + i) & 0x1f;
387 if (proxy_fds[offset] == request->proxy->sockfd) {
389 entry->id[request->proxy->id] &= ~(1 << offset);
392 } /* else die horribly? */
395 * Hmm... not sure what to do here.
397 DEBUG3(" proxy: FAILED TO FIND %08x:%d %d",
406 * Delete a particular request.
408 void rl_delete(REQUEST *request)
411 REQNODE *prev, *next;
413 prev = ((REQNODE *) request->container)->prev;
414 next = ((REQNODE *) request->container)->next;
416 id = request->packet->id;
419 * Update the last request we touched.
421 * This is so the periodic "walk & clean list"
422 * function, below, doesn't walk over all requests
423 * all of the time. Rather, it tries to amortize
426 if (last_request == request) {
427 last_request = rl_next(last_request);
432 request_list[id].first_request = next;
438 request_list[id].last_request = prev;
443 free(request->container);
447 * Update the SNMP statistics.
449 * Note that we do NOT do this in rad_respond(),
450 * as that function is called from child threads.
451 * Instead, we update the stats when a request is
452 * deleted, because only the main server thread calls
455 if (mainconfig.do_snmp) {
456 switch (request->reply->code) {
457 case PW_AUTHENTICATION_ACK:
458 rad_snmp.auth.total_responses++;
459 rad_snmp.auth.total_access_accepts++;
462 case PW_AUTHENTICATION_REJECT:
463 rad_snmp.auth.total_responses++;
464 rad_snmp.auth.total_access_rejects++;
467 case PW_ACCESS_CHALLENGE:
468 rad_snmp.auth.total_responses++;
469 rad_snmp.auth.total_access_challenges++;
472 case PW_ACCOUNTING_RESPONSE:
473 rad_snmp.acct.total_responses++;
483 * Delete the request from the tree.
488 node = rbtree_find(request_tree, request);
489 rad_assert(node != NULL);
490 rbtree_delete(request_tree, node);
494 * If there's a proxied packet, and we're still
495 * waiting for a reply, then delete the packet
496 * from the list of outstanding proxied requests.
498 if (request->proxy &&
499 (request->proxy_outstanding > 0)) {
500 pthread_mutex_lock(&proxy_mutex);
501 node = rbtree_find(proxy_tree, request);
502 rl_delete_proxy(request, node);
503 pthread_mutex_unlock(&proxy_mutex);
507 request_free(&request);
508 request_list[id].request_count--;
512 * Add a request to the request list.
514 void rl_add(REQUEST *request)
516 int id = request->packet->id;
519 rad_assert(request->container == NULL);
521 request->container = rad_malloc(sizeof(REQNODE));
522 node = (REQNODE *) request->container;
528 if (!request_list[id].first_request) {
529 rad_assert(request_list[id].request_count == 0);
531 request_list[id].first_request = node;
532 request_list[id].last_request = node;
534 rad_assert(request_list[id].request_count != 0);
536 node->prev = request_list[id].last_request;
537 request_list[id].last_request->next = node;
538 request_list[id].last_request = node;
542 * Insert the request into the tree.
544 if (rbtree_insert(request_tree, request) == 0) {
545 rad_assert("FAIL" == NULL);
548 request_list[id].request_count++;
552 * Look up a particular request, using:
554 * Request ID, request code, source IP, source port,
556 * Note that we do NOT use the request vector to look up requests.
558 * We MUST NOT have two requests with identical (id/code/IP/port), and
559 * different vectors. This is a serious error!
561 REQUEST *rl_find(RADIUS_PACKET *packet)
565 myrequest.packet = packet;
567 return rbtree_finddata(request_tree, &myrequest);
573 extern int proxy_new_listener(void);
576 * Add an entry to the proxy tree.
578 * This is the ONLY function in this source file which may be called
579 * from a child thread. It therefore needs mutexes...
581 int rl_add_proxy(REQUEST *request)
585 proxy_id_t myid, *entry;
587 myid.dst_ipaddr = request->proxy->dst_ipaddr;
588 myid.dst_port = request->proxy->dst_port;
591 * Proxied requests get sent out the proxy FD ONLY.
593 * FIXME: Once we allocate multiple proxy FD's, move this
594 * code to below, so we can have more than 256 requests
597 request->proxy_outstanding = 1;
599 pthread_mutex_lock(&proxy_mutex);
604 entry = rbtree_finddata(proxy_id_tree, &myid);
605 if (!entry) { /* allocate it */
606 entry = rad_malloc(sizeof(*entry) + sizeof(entry->id) * 255);
608 entry->dst_ipaddr = request->proxy->dst_ipaddr;
609 entry->dst_port = request->proxy->dst_port;
612 DEBUG3(" proxy: creating %08x:%d",
617 * Insert the new home server entry into
620 * FIXME: We don't (currently) delete the
621 * entries, so this is technically a
624 if (rbtree_insert(proxy_id_tree, entry) == 0) {
625 DEBUG2("ERROR: Failed to insert entry into proxy Id tree");
631 * Clear out bits in the array which DO have
632 * proxy Fd's associated with them. We do this
633 * by getting the mask of bits which have proxy
636 for (i = 0; i < 32; i++) {
637 if (proxy_fds[i] != -1) {
641 rad_assert(mask != 0);
644 * Set bits here indicate that the Fd is in use.
651 * Set the bits which are unused (and therefore
652 * allocated). The clear bits indicate that the Id
653 * for that FD is unused.
655 for (i = 0; i < 256; i++) {
658 } /* else the entry already existed in the proxy Id tree */
662 * Try to find a free Id.
665 for (i = 0; i < 256; i++) {
667 * Some bits are still zero..
669 if (entry->id[(i + entry->index) & 0xff] != (uint32_t) ~0) {
670 found = (i + entry->index) & 0xff;
675 * Hmm... do we want to re-use Id's, when we
676 * haven't seen all of the responses?
681 * No free Id, try to get a new FD.
685 * First, see if there were FD's recently allocated,
686 * which we don't know about.
689 for (i = 0; i < 32; i++) {
690 if (proxy_fds[i] < 0) continue;
696 * There ARE more FD's than we know about.
697 * Update the masks for Id's, and re-try.
699 if (entry->mask != mask) {
701 * New mask always has more bits than
702 * the old one, but never fewer bits.
704 rad_assert((entry->mask & mask) == entry->mask);
707 * Clear the bits we already know about,
708 * and then or in those bits into the
716 * Clear the bits in the Id's for the new
719 for (i = 0; i < 256; i++) {
720 entry->id[i] &= mask;
724 * And try again to allocate an Id.
727 } /* else no new Fd's were allocated. */
730 * If all Fd's are allocated, die.
733 radlog(L_ERR|L_CONS, "ERROR: More than 8000 proxied requests outstanding for home server %08x:%d",
734 ntohs(entry->dst_ipaddr), entry->dst_port);
739 * Allocate a new proxy Fd. This function adds it
740 * into the list of listeners.
742 proxy = proxy_new_listener();
744 DEBUG2("ERROR: Failed to create a new socket for proxying requests.");
752 for (i = 0; i < 32; i++) {
754 * Found a free entry. Save the socket,
755 * and remember where we saved it.
757 if (proxy_fds[(proxy + i) & 0x1f] == -1) {
758 proxy_fds[(proxy + i) & 0x1f] = proxy;
759 found = (proxy + i) & 0x1f;
763 rad_assert(found >= 0); /* i.e. the mask had free bits. */
770 * Clear the relevant bits in the mask.
772 for (i = 0; i < 256; i++) {
773 entry->id[i] &= mask;
777 * Pick a random Id to start from, as we've
778 * just guaranteed that it's free.
780 found = lrad_rand() & 0xff;
784 * Mark next (hopefully unused) entry.
786 entry->index = (found + 1) & 0xff;
789 * We now have to find WHICH proxy fd to use.
792 for (i = 0; i < 32; i++) {
794 * FIXME: pick a random socket to use?
796 if ((entry->id[found] & (1 << i)) == 0) {
803 * There was no bit clear, which we had just checked above...
805 rad_assert(proxy != -1);
808 * Mark the Id as allocated, for thei Fd.
810 entry->id[found] |= (1 << proxy);
811 request->proxy->id = found;
812 request->proxy->src_ipaddr = proxy_ipaddr;
814 rad_assert(proxy_fds[proxy] != -1);
815 request->proxy->sockfd = proxy_fds[proxy];
817 DEBUG3(" proxy: allocating %08x:%d %d",
822 if (!rbtree_insert(proxy_tree, request)) {
823 DEBUG2("ERROR: Failed to insert entry into proxy tree");
827 pthread_mutex_unlock(&proxy_mutex);
834 * Look up a particular request, using:
836 * Request Id, request code, source IP, source port,
838 * Note that we do NOT use the request vector to look up requests.
840 * We MUST NOT have two requests with identical (id/code/IP/port), and
841 * different vectors. This is a serious error!
843 REQUEST *rl_find_proxy(RADIUS_PACKET *packet)
846 REQUEST myrequest, *maybe = NULL;
847 RADIUS_PACKET myproxy;
850 * If we use the socket FD as an indicator,
851 * then that implicitely contains information
852 * as to our src ipaddr/port, so we don't need
853 * to use that in the comparisons.
855 myproxy.sockfd = packet->sockfd;
856 myproxy.id = packet->id;
857 myproxy.dst_ipaddr = packet->src_ipaddr;
858 myproxy.dst_port = packet->src_port;
861 myrequest.magic = REQUEST_MAGIC;
863 myrequest.proxy = &myproxy;
865 pthread_mutex_lock(&proxy_mutex);
866 node = rbtree_find(proxy_tree, &myrequest);
869 maybe = rbtree_node2data(proxy_tree, node);
870 rad_assert(maybe->proxy_outstanding > 0);
871 maybe->proxy_outstanding--;
874 * Received all of the replies we expect.
875 * delete it from both trees.
877 if (maybe->proxy_outstanding == 0) {
878 rl_delete_proxy(&myrequest, node);
881 pthread_mutex_unlock(&proxy_mutex);
888 * Walk over all requests, performing a callback for each request.
890 int rl_walk(RL_WALK_FUNC walker, void *data)
893 REQNODE *curreq, *next;
896 * Walk over all 256 ID's.
898 for (id = 0; id < 256; id++) {
901 * Walk over the request list for each ID.
903 for (curreq = request_list[id].first_request;
907 * The callback MIGHT delete the current
908 * request, so we CANNOT depend on curreq->next
909 * to be there, when going to the next element
914 rcode = walker(curreq->req, data);
915 if (rcode != RL_WALK_CONTINUE) {
926 * Walk from one request to the next.
928 REQUEST *rl_next(REQUEST *request)
934 * If we were passed a request, then go to the "next" one.
936 if (request != NULL) {
937 rad_assert(request->magic == REQUEST_MAGIC);
940 * It has a "next", return it.
942 if (((REQNODE *)request->container)->next != NULL) {
943 return ((REQNODE *)request->container)->next->req;
946 * No "next", increment the ID, and look
949 start_id = request->packet->id + 1;
955 * No input request, start looking at ID 0.
962 * Check all ID's, wrapping around at 255.
964 for (id = start_id; id < (start_id + count); id++) {
967 * This ID has a request, return it.
969 if (request_list[id & 0xff].first_request != NULL) {
970 rad_assert(request_list[id&0xff].first_request->req != request);
972 return request_list[id & 0xff].first_request->req;
977 * No requests at all in the list. Nothing to do.
979 DEBUG3("rl_next: returning NULL");
985 * Return the number of requests in the request list.
987 int rl_num_requests(void)
990 int request_count = 0;
992 for (id = 0; id < 256; id++) {
993 request_count += request_list[id].request_count;
996 return request_count;
1000 typedef struct rl_walk_t {
1007 * Refresh a request, by using proxy_retry_delay, cleanup_delay,
1008 * max_request_time, etc.
1010 * When walking over the request list, all of the per-request
1011 * magic is done here.
1013 static int refresh_request(REQUEST *request, void *data)
1015 rl_walk_t *info = (rl_walk_t *) data;
1017 child_pid_t child_pid;
1019 rad_assert(request->magic == REQUEST_MAGIC);
1022 * If the request is marked as a delayed reject, AND it's
1023 * time to send the reject, then do so now.
1025 if (request->finished &&
1026 ((request->options & RAD_REQUEST_OPTION_DELAYED_REJECT) != 0)) {
1027 rad_assert(request->child_pid == NO_SUCH_CHILD_PID);
1029 difference = info->now - request->timestamp;
1030 if (difference >= (time_t) mainconfig.reject_delay) {
1033 * Clear the 'delayed reject' bit, so that we
1034 * don't do this again.
1036 request->options &= ~RAD_REQUEST_OPTION_DELAYED_REJECT;
1037 rad_send(request->reply, request->packet,
1043 * If the request has finished processing, AND it's child has
1044 * been cleaned up, AND it's time to clean up the request,
1045 * OR, it's an accounting request. THEN, go delete it.
1047 * If this is a request which had the "don't cache" option
1048 * set, then delete it immediately, as it CANNOT have a
1051 if (request->finished &&
1052 ((request->timestamp + mainconfig.cleanup_delay <= info->now) ||
1053 ((request->options & RAD_REQUEST_OPTION_DONT_CACHE) != 0))) {
1054 rad_assert(request->child_pid == NO_SUCH_CHILD_PID);
1057 * Request completed, delete it, and unlink it
1058 * from the currently 'alive' list of requests.
1060 DEBUG2("Cleaning up request %d ID %d with timestamp %08lx",
1061 request->number, request->packet->id,
1062 (unsigned long) request->timestamp);
1065 * Delete the request.
1068 return RL_WALK_CONTINUE;
1072 * Maybe the child process handling the request has hung:
1073 * kill it, and continue.
1075 if ((request->timestamp + mainconfig.max_request_time) <= info->now) {
1078 child_pid = request->child_pid;
1079 number = request->number;
1082 * There MUST be a RAD_PACKET reply.
1084 rad_assert(request->reply != NULL);
1087 * If we've tried to proxy the request, and
1088 * the proxy server hasn't responded, then
1089 * we send a REJECT back to the caller.
1091 * For safety, we assert that there is no child
1092 * handling the request. If the assertion fails,
1093 * it means that we've sent a proxied request to
1094 * the home server, and the child thread is still
1095 * sitting on the request!
1097 if (request->proxy && !request->proxy_reply) {
1098 rad_assert(request->child_pid == NO_SUCH_CHILD_PID);
1100 radlog(L_ERR, "Rejecting request %d due to lack of any response from home server %s:%d",
1102 client_name(request->packet->src_ipaddr),
1103 request->packet->src_port);
1104 request_reject(request);
1105 request->finished = TRUE;
1106 return RL_WALK_CONTINUE;
1109 if (mainconfig.kill_unresponsive_children) {
1110 if (child_pid != NO_SUCH_CHILD_PID) {
1112 * This request seems to have hung
1115 #ifdef HAVE_PTHREAD_H
1116 radlog(L_ERR, "Killing unresponsive thread for request %d",
1118 pthread_cancel(child_pid);
1120 } /* else no proxy reply, quietly fail */
1123 * Maybe we haven't killed it. In that
1124 * case, print a warning.
1126 } else if ((child_pid != NO_SUCH_CHILD_PID) &&
1127 ((request->options & RAD_REQUEST_OPTION_LOGGED_CHILD) == 0)) {
1128 radlog(L_ERR, "WARNING: Unresponsive child (id %lu) for request %d",
1129 (unsigned long)child_pid, number);
1132 * Set the option that we've sent a log message,
1133 * so that we don't send more than one message
1136 request->options |= RAD_REQUEST_OPTION_LOGGED_CHILD;
1140 * Send a reject message for the request, mark it
1141 * finished, and forget about the child.
1143 request_reject(request);
1144 request->child_pid = NO_SUCH_CHILD_PID;
1145 if (mainconfig.kill_unresponsive_children)
1146 request->finished = TRUE;
1147 return RL_WALK_CONTINUE;
1148 } /* the request has been in the queue for too long */
1151 * If the request is still being processed, then due to the
1152 * above check, it's still within it's time limit. In that
1153 * case, don't do anything.
1155 if (request->child_pid != NO_SUCH_CHILD_PID) {
1156 return RL_WALK_CONTINUE;
1160 * The request is finished.
1162 if (request->finished) goto setup_timeout;
1165 * We're not proxying requests at all.
1167 if (!mainconfig.proxy_requests) goto setup_timeout;
1170 * We're proxying synchronously, so we don't retry it here.
1171 * Some other code takes care of retrying the proxy requests.
1173 if (mainconfig.proxy_synchronous) goto setup_timeout;
1176 * The proxy retry delay is zero, meaning don't retry.
1178 if (mainconfig.proxy_retry_delay == 0) goto setup_timeout;
1181 * There is no proxied request for this packet, so there's
1184 if (!request->proxy) goto setup_timeout;
1187 * We've already seen the proxy reply, so we don't need
1188 * to send another proxy request.
1190 if (request->proxy_reply) goto setup_timeout;
1193 * It's not yet time to re-send this proxied request.
1195 if (request->proxy_next_try > info->now) goto setup_timeout;
1198 * If the proxy retry count is zero, then
1199 * we've sent the last try, and have NOT received
1200 * a reply from the end server. In that case,
1201 * we don't bother trying again, but just mark
1202 * the request as finished, and go to the next one.
1204 if (request->proxy_try_count == 0) {
1205 rad_assert(request->child_pid == NO_SUCH_CHILD_PID);
1206 request_reject(request);
1207 realm_disable(request->proxy->dst_ipaddr,request->proxy->dst_port);
1208 request->finished = TRUE;
1213 * We're trying one more time, so count down
1214 * the tries, and set the next try time.
1216 request->proxy_try_count--;
1217 request->proxy_next_try = info->now + mainconfig.proxy_retry_delay;
1220 * Don't restransmit accounting requests.
1221 * Only the originating NAS should do this.
1223 if (request->proxy->code == PW_ACCOUNTING_REQUEST) {
1228 * Assert that we have NOT seen the proxy reply yet.
1230 * If we HAVE seen it, then we SHOULD NOT be bugging the
1233 rad_assert(request->proxy_reply == NULL);
1236 * Send the proxy packet.
1238 request->proxy_outstanding++;
1239 rad_send(request->proxy, NULL, request->proxysecret);
1243 * Don't do more long-term checks, if we've got to wake
1246 if (info->smallest == 0) {
1247 return RL_WALK_CONTINUE;
1251 * The request is finished. Wake up when it's time to
1254 if (request->finished) {
1255 difference = (request->timestamp + mainconfig.cleanup_delay) - info->now;
1258 * If the request is marked up to be rejected later,
1259 * then wake up later.
1261 if ((request->options & RAD_REQUEST_OPTION_DELAYED_REJECT) != 0) {
1262 if (difference >= (time_t) mainconfig.reject_delay) {
1263 difference = (time_t) mainconfig.reject_delay;
1267 } else if (request->proxy && !request->proxy_reply) {
1269 * The request is NOT finished, but there is an
1270 * outstanding proxy request, with no matching
1273 * Wake up when it's time to re-send
1274 * the proxy request.
1276 * But in synchronous proxy, we don't retry but we update
1277 * the next retry time as NAS has not resent the request
1278 * in the given retry window.
1280 if (mainconfig.proxy_synchronous) {
1282 * If the retry_delay * count has passed,
1283 * then mark the realm dead.
1285 if (info->now > (request->timestamp + (mainconfig.proxy_retry_delay * mainconfig.proxy_retry_count))) {
1286 rad_assert(request->child_pid == NO_SUCH_CHILD_PID);
1287 request_reject(request);
1289 realm_disable(request->proxy->dst_ipaddr,
1290 request->proxy->dst_port);
1291 request->finished = TRUE;
1294 request->proxy_next_try = info->now + mainconfig.proxy_retry_delay;
1296 difference = request->proxy_next_try - info->now;
1299 * The request is NOT finished.
1301 * Wake up when it's time to kill the errant
1304 difference = (request->timestamp + mainconfig.max_request_time) - info->now;
1308 * If the server is CPU starved, then we CAN miss a time
1309 * for servicing requests. In which case the 'difference'
1310 * value will be negative. select() doesn't like that,
1313 if (difference < 0) {
1318 * Update the 'smallest' time.
1320 if ((info->smallest < 0) ||
1321 (difference < info->smallest)) {
1322 info->smallest = difference;
1325 return RL_WALK_CONTINUE;
1330 * Clean up the request list, every so often.
1332 * This is done by walking through ALL of the list, and
1333 * - marking any requests which are finished, and expired
1334 * - killing any processes which are NOT finished after a delay
1335 * - deleting any marked requests.
1337 struct timeval *rl_clean_list(time_t now)
1340 * Static variables, so that we don't do all of this work
1341 * more than once per second.
1343 * Note that we have 'tv' and 'last_tv'. 'last_tv' is
1344 * pointed to by 'last_tv_ptr', and depending on the
1345 * system implementation of select(), it MAY be modified.
1347 * In that was, we want to use the ORIGINAL value, from
1348 * 'tv', and wipe out the (possibly modified) last_tv.
1350 static time_t last_cleaned_list = 0;
1351 static struct timeval tv, *last_tv_ptr = NULL;
1352 static struct timeval last_tv;
1360 * If we've already set up the timeout or cleaned the
1361 * request list this second, then don't do it again. We
1362 * simply return the sleep delay from last time.
1364 * Note that if we returned NULL last time, there was nothing
1365 * to do. BUT we've been woken up since then, which can only
1366 * happen if we received a packet. And if we've received a
1367 * packet, then there's some work to do in the future.
1369 * FIXME: We can probably use gettimeofday() for finer clock
1370 * resolution, as the current method will cause it to sleep
1373 if ((last_tv_ptr != NULL) &&
1374 (last_cleaned_list == now) &&
1379 * If we're NOT walking the entire request list,
1380 * then we want to iteratively check the request
1383 * If there is NO previous request, go look for one.
1386 last_request = rl_next(last_request);
1389 * On average, there will be one request per
1390 * 'cleanup_delay' requests, which needs to be
1393 * And only do this servicing, if we have a request
1397 for (i = 0; i < mainconfig.cleanup_delay; i++) {
1401 * This function call MAY delete the
1402 * request pointed to by 'last_request'.
1404 next = rl_next(last_request);
1405 refresh_request(last_request, &info);
1406 last_request = next;
1409 * Nothing to do any more, exit.
1416 DEBUG2("Waking up in %d seconds...",
1417 (int) last_tv_ptr->tv_sec);
1420 last_cleaned_list = now;
1421 last_request = NULL;
1422 DEBUG2("--- Walking the entire request list ---");
1425 * Hmmm... this is Big Magic. We make it seem like
1426 * there's an additional second to wait, for a whole
1427 * host of reasons which I can't explain adequately,
1428 * but which cause the code to Just Work Right.
1432 rl_walk(refresh_request, &info);
1435 * We haven't found a time at which we need to wake up.
1436 * Return NULL, so that the select() call will sleep forever.
1438 if (info.smallest < 0) {
1440 * If we're not proxying, then there really isn't anything
1443 * If we ARE proxying, then we can safely sleep
1444 * forever if we're told to NEVER send proxy retries
1445 * ourselves, until the NAS kicks us again.
1447 * Otherwise, there are no outstanding requests, then
1448 * we can sleep forever. This happens when we get
1449 * woken up with a bad packet. It's discarded, so if
1450 * there are no live requests, we can safely sleep
1453 if ((!mainconfig.proxy_requests) ||
1454 mainconfig.proxy_synchronous ||
1455 (rl_num_requests() == 0)) {
1456 DEBUG2("Nothing to do. Sleeping until we see a request.");
1462 * We ARE proxying. In that case, we avoid a race condition
1463 * where a child thread handling a request proxies the
1464 * packet, and sets the retry delay. In that case, we're
1465 * supposed to wake up in N seconds, but we can't, as
1466 * we're sleeping forever.
1468 * Instead, we prevent the problem by waking up anyhow
1469 * at the 'proxy_retry_delay' time, even if there's
1470 * nothing to do. In the worst case, this will cause
1471 * the server to wake up every N seconds, to do a small
1472 * amount of unnecessary work.
1474 info.smallest = mainconfig.proxy_retry_delay;
1477 * Set the time (in seconds) for how long we're
1478 * supposed to sleep.
1480 tv.tv_sec = info.smallest;
1482 DEBUG2("Waking up in %d seconds...", (int) info.smallest);
1485 * Remember how long we should sleep for.
1488 last_tv_ptr = &last_tv;