2 protocol.c -- handle the meta-protocol, basic functions
3 Copyright (C) 1999-2001 Ivo Timmermans <ivo@o2w.nl>,
4 2000,2001 Guus Sliepen <guus@sliepen.eu.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: protocol.c,v 1.28.4.148 2003/11/17 15:30:17 guus Exp $
26 #include "connection.h"
33 bool tunnelserver = false;
35 /* Jumptable for the request handlers */
37 static bool (*request_handlers[])(connection_t *) = {
38 NULL, NULL, NULL, NULL, ack_h,
39 status_h, error_h, termreq_h,
41 add_subnet_h, del_subnet_h,
42 add_edge_h, del_edge_h,
43 key_changed_h, req_key_h, ans_key_h, tcppacket_h,
48 static char (*request_name[]) = {
49 "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
50 "STATUS", "ERROR", "TERMREQ",
52 "ADD_SUBNET", "DEL_SUBNET",
53 "ADD_EDGE", "DEL_EDGE", "KEY_CHANGED", "REQ_KEY", "ANS_KEY", "PACKET",
56 static avl_tree_t *past_request_tree;
58 bool check_id(const char *id)
61 if(!isalnum(*id) && *id != '_')
67 /* Generic request routines - takes care of logging and error
70 bool send_request(connection_t *c, const char *format, ...)
73 char buffer[MAXBUFSIZE];
78 /* Use vsnprintf instead of vasprintf: faster, no memory
79 fragmentation, cleanup is automatic, and there is a limit on the
80 input buffer anyway */
82 va_start(args, format);
83 len = vsnprintf(buffer, MAXBUFSIZE, format, args);
86 if(len < 0 || len > MAXBUFSIZE - 1) {
87 logger(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"),
88 c->name, c->hostname);
93 sscanf(buffer, "%d", &request);
95 logger(LOG_DEBUG, _("Sending %s to %s (%s): %s"),
96 request_name[request], c->name, c->hostname, buffer);
98 logger(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request],
99 c->name, c->hostname);
102 buffer[len++] = '\n';
105 broadcast_meta(NULL, buffer, len);
108 return send_meta(c, buffer, len);
111 void forward_request(connection_t *from)
118 sscanf(from->buffer, "%d", &request);
120 logger(LOG_DEBUG, _("Forwarding %s from %s (%s): %s"),
121 request_name[request], from->name, from->hostname,
124 logger(LOG_DEBUG, _("Forwarding %s from %s (%s)"),
125 request_name[request], from->name, from->hostname);
128 from->buffer[from->reqlen - 1] = '\n';
130 broadcast_meta(from, from->buffer, from->reqlen);
133 bool receive_request(connection_t *c)
139 if(sscanf(c->buffer, "%d", &request) == 1) {
140 if((request < 0) || (request >= LAST) || !request_handlers[request]) {
142 logger(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
143 c->name, c->hostname, c->buffer);
145 logger(LOG_ERR, _("Unknown request from %s (%s)"),
146 c->name, c->hostname);
152 logger(LOG_DEBUG, _("Got %s from %s (%s): %s"),
153 request_name[request], c->name, c->hostname,
156 logger(LOG_DEBUG, _("Got %s from %s (%s)"),
157 request_name[request], c->name, c->hostname);
161 if((c->allow_request != ALL) && (c->allow_request != request)) {
162 logger(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name,
167 if(!request_handlers[request](c)) {
168 /* Something went wrong. Probably scriptkiddies. Terminate. */
170 logger(LOG_ERR, _("Error while processing %s from %s (%s)"),
171 request_name[request], c->name, c->hostname);
175 logger(LOG_ERR, _("Bogus data received from %s (%s)"),
176 c->name, c->hostname);
183 static int past_request_compare(const past_request_t *a, const past_request_t *b)
185 return strcmp(a->request, b->request);
188 static void free_past_request(past_request_t *r)
198 void init_requests(void)
202 past_request_tree = avl_alloc_tree((avl_compare_t) past_request_compare, (avl_action_t) free_past_request);
205 void exit_requests(void)
209 avl_delete_tree(past_request_tree);
212 bool seen_request(char *request)
214 past_request_t *new, p = {0};
220 if(avl_search(past_request_tree, &p)) {
221 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Already seen request"));
224 new = xmalloc(sizeof(*new));
225 new->request = xstrdup(request);
226 new->firstseen = now;
227 avl_insert(past_request_tree, new);
232 void age_past_requests(void)
234 avl_node_t *node, *next;
236 int left = 0, deleted = 0;
240 for(node = past_request_tree->head; node; node = next) {
244 if(p->firstseen + pingtimeout < now)
245 avl_delete_node(past_request_tree, node), deleted++;
251 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Aging past requests: deleted %d, left %d"),