2 protocol.c -- handle the meta-protocol, basic functions
3 Copyright (C) 1999-2001 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
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 1.2 2002/05/02 11:50:07 zarq Exp $
25 #include <sys/types.h>
39 #include "connection.h"
40 #include "interface.h"
45 avl_tree_t *past_request_tree;
47 int check_id(char *id)
51 for (i = 0; i < strlen(id); i++)
52 if(!isalnum(id[i]) && id[i] != '_')
58 /* Generic request routines - takes care of logging and error
61 int send_request(connection_t *c, const char *format, ...)
64 char buffer[MAXBUFSIZE];
68 /* Use vsnprintf instead of vasprintf: faster, no memory
69 fragmentation, cleanup is automatic, and there is a limit on the
70 input buffer anyway */
72 va_start(args, format);
73 len = vsnprintf(buffer, MAXBUFSIZE, format, args);
76 if(len < 0 || len > MAXBUFSIZE-1)
78 syslog(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"), c->name, c->hostname);
82 if(debug_lvl >= DEBUG_PROTOCOL)
84 sscanf(buffer, "%d", &request);
85 if(debug_lvl >= DEBUG_META)
86 syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], c->name, c->hostname, buffer);
88 syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], c->name, c->hostname);
93 return send_meta(c, buffer, len);
96 int receive_request(connection_t *c)
100 if(sscanf(c->buffer, "%d", &request) == 1)
102 if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
104 if(debug_lvl >= DEBUG_META)
105 syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
106 c->name, c->hostname, c->buffer);
108 syslog(LOG_ERR, _("Unknown request from %s (%s)"),
109 c->name, c->hostname);
115 if(debug_lvl >= DEBUG_PROTOCOL)
117 if(debug_lvl >= DEBUG_META)
118 syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"),
119 request_name[request], c->name, c->hostname, c->buffer);
121 syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
122 request_name[request], c->name, c->hostname);
126 if((c->allow_request != ALL) && (c->allow_request != request))
128 syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname);
132 if(request_handlers[request](c))
133 /* Something went wrong. Probably scriptkiddies. Terminate. */
135 syslog(LOG_ERR, _("Error while processing %s from %s (%s)"),
136 request_name[request], c->name, c->hostname);
142 syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
143 c->name, c->hostname);
150 int past_request_compare(past_request_t *a, past_request_t *b)
153 return strcmp(a->request, b->request);
156 void free_past_request(past_request_t *r)
165 void init_requests(void)
168 past_request_tree = avl_alloc_tree((avl_compare_t)past_request_compare, (avl_action_t)free_past_request);
172 void exit_requests(void)
175 avl_delete_tree(past_request_tree);
179 int seen_request(char *request)
181 past_request_t p, *new;
185 if(avl_search(past_request_tree, &p))
187 if(debug_lvl >= DEBUG_SCARY_THINGS)
188 syslog(LOG_DEBUG, _("Already seen request"));
193 new = (past_request_t *)xmalloc(sizeof(*new));
194 new->request = xstrdup(request);
195 new->firstseen = now;
196 avl_insert(past_request_tree, new);
202 void age_past_requests(void)
204 avl_node_t *node, *next;
206 int left = 0, deleted = 0;
208 for(node = past_request_tree->head; node; node = next)
211 p = (past_request_t *)node->data;
212 if(p->firstseen + pingtimeout < now)
213 avl_delete_node(past_request_tree, node), deleted++;
218 if(debug_lvl >= DEBUG_SCARY_THINGS && left + deleted)
219 syslog(LOG_DEBUG, _("Aging past requests: deleted %d, left %d\n"), deleted, left);
223 /* Jumptable for the request handlers */
225 int (*request_handlers[])(connection_t*) = {
226 id_h, metakey_h, challenge_h, chal_reply_h, ack_h,
227 status_h, error_h, termreq_h,
229 /* add_node_h, del_node_h,*/
230 add_subnet_h, del_subnet_h,
231 add_edge_h, del_edge_h,
232 key_changed_h, req_key_h, ans_key_h,
237 char (*request_name[]) = {
238 "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
239 "STATUS", "ERROR", "TERMREQ",
241 /* "ADD_NODE", "DEL_NODE",*/
242 "ADD_SUBNET", "DEL_SUBNET",
243 "ADD_EDGE", "DEL_EDGE",
244 "KEY_CHANGED", "REQ_KEY", "ANS_KEY",