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 1.30 2002/04/09 15:26:00 zarq Exp $
25 #include <sys/types.h>
40 #include "connection.h"
44 avl_tree_t *past_request_tree;
46 int check_id(char *id)
50 for (i = 0; i < strlen(id); i++)
51 if(!isalnum(id[i]) && id[i] != '_')
57 /* Generic request routines - takes care of logging and error
60 int send_request(connection_t *c, const char *format, ...)
63 char buffer[MAXBUFSIZE];
67 /* Use vsnprintf instead of vasprintf: faster, no memory
68 fragmentation, cleanup is automatic, and there is a limit on the
69 input buffer anyway */
71 va_start(args, format);
72 len = vsnprintf(buffer, MAXBUFSIZE, format, args);
75 if(len < 0 || len > MAXBUFSIZE-1)
77 syslog(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"), c->name, c->hostname);
81 if(debug_lvl >= DEBUG_PROTOCOL)
83 sscanf(buffer, "%d", &request);
84 if(debug_lvl >= DEBUG_META)
85 syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], c->name, c->hostname, buffer);
87 syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], c->name, c->hostname);
92 return send_meta(c, buffer, len);
95 int receive_request(connection_t *c)
99 if(sscanf(c->buffer, "%d", &request) == 1)
101 if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
103 if(debug_lvl >= DEBUG_META)
104 syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
105 c->name, c->hostname, c->buffer);
107 syslog(LOG_ERR, _("Unknown request from %s (%s)"),
108 c->name, c->hostname);
114 if(debug_lvl >= DEBUG_PROTOCOL)
116 if(debug_lvl >= DEBUG_META)
117 syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"),
118 request_name[request], c->name, c->hostname, c->buffer);
120 syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
121 request_name[request], c->name, c->hostname);
125 if((c->allow_request != ALL) && (c->allow_request != request))
127 syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname);
131 if(request_handlers[request](c))
132 /* Something went wrong. Probably scriptkiddies. Terminate. */
134 syslog(LOG_ERR, _("Error while processing %s from %s (%s)"),
135 request_name[request], c->name, c->hostname);
141 syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
142 c->name, c->hostname);
149 int past_request_compare(past_request_t *a, past_request_t *b)
152 return strcmp(a->request, b->request);
155 void free_past_request(past_request_t *r)
164 void init_requests(void)
167 past_request_tree = avl_alloc_tree((avl_compare_t)past_request_compare, (avl_action_t)free_past_request);
171 void exit_requests(void)
174 avl_delete_tree(past_request_tree);
178 int seen_request(char *request)
180 past_request_t p, *new;
184 if(avl_search(past_request_tree, &p))
186 if(debug_lvl >= DEBUG_SCARY_THINGS)
187 syslog(LOG_DEBUG, _("Already seen request"));
192 new = (past_request_t *)xmalloc(sizeof(*new));
193 new->request = xstrdup(request);
194 new->firstseen = now;
195 avl_insert(past_request_tree, new);
201 void age_past_requests(void)
203 avl_node_t *node, *next;
205 int left = 0, deleted = 0;
207 for(node = past_request_tree->head; node; node = next)
210 p = (past_request_t *)node->data;
211 if(p->firstseen + pingtimeout < now)
212 avl_delete_node(past_request_tree, node), deleted++;
217 if(debug_lvl >= DEBUG_SCARY_THINGS && left + deleted)
218 syslog(LOG_DEBUG, _("Aging past requests: deleted %d, left %d\n"), deleted, left);
222 /* Jumptable for the request handlers */
224 int (*request_handlers[])(connection_t*) = {
225 id_h, metakey_h, challenge_h, chal_reply_h, ack_h,
226 status_h, error_h, termreq_h,
228 add_subnet_h, del_subnet_h,
229 add_edge_h, del_edge_h,
230 key_changed_h, req_key_h, ans_key_h,
236 char (*request_name[]) = {
237 "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
238 "STATUS", "ERROR", "TERMREQ",
240 "ADD_SUBNET", "DEL_SUBNET",
241 "ADD_EDGE", "DEL_EDGE",
242 "KEY_CHANGED", "REQ_KEY", "ANS_KEY",