+++ /dev/null
-/*
- protocol.c -- handle the meta-protocol, basic functions
- Copyright (C) 1999-2001 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id: protocol.c,v 1.2 2002/05/02 11:50:07 zarq Exp $
-*/
-
-#include "config.h"
-
-#include <sys/types.h>
-
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <errno.h>
-
-#include <utils.h>
-#include <xalloc.h>
-
-#include "conf.h"
-#include "protocol.h"
-#include "meta.h"
-#include "connection.h"
-#include "interface.h"
-#include "logging.h"
-
-#include "system.h"
-
-avl_tree_t *past_request_tree;
-
-int check_id(char *id)
-{
- int i;
-
- for (i = 0; i < strlen(id); i++)
- if(!isalnum(id[i]) && id[i] != '_')
- return -1;
-
- return 0;
-}
-
-/* Generic request routines - takes care of logging and error
- detection as well */
-
-int send_request(connection_t *c, const char *format, ...)
-{
- va_list args;
- char buffer[MAXBUFSIZE];
- int len, request;
-
-cp
- /* Use vsnprintf instead of vasprintf: faster, no memory
- fragmentation, cleanup is automatic, and there is a limit on the
- input buffer anyway */
-
- va_start(args, format);
- len = vsnprintf(buffer, MAXBUFSIZE, format, args);
- va_end(args);
-
- if(len < 0 || len > MAXBUFSIZE-1)
- {
- syslog(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"), c->name, c->hostname);
- return -1;
- }
-
- if(debug_lvl >= DEBUG_PROTOCOL)
- {
- sscanf(buffer, "%d", &request);
- if(debug_lvl >= DEBUG_META)
- syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], c->name, c->hostname, buffer);
- else
- syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], c->name, c->hostname);
- }
-
- buffer[len++] = '\n';
-cp
- return send_meta(c, buffer, len);
-}
-
-int receive_request(connection_t *c)
-{
- int request;
-cp
- if(sscanf(c->buffer, "%d", &request) == 1)
- {
- if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
- {
- if(debug_lvl >= DEBUG_META)
- syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
- c->name, c->hostname, c->buffer);
- else
- syslog(LOG_ERR, _("Unknown request from %s (%s)"),
- c->name, c->hostname);
-
- return -1;
- }
- else
- {
- if(debug_lvl >= DEBUG_PROTOCOL)
- {
- if(debug_lvl >= DEBUG_META)
- syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"),
- request_name[request], c->name, c->hostname, c->buffer);
- else
- syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
- request_name[request], c->name, c->hostname);
- }
- }
-
- if((c->allow_request != ALL) && (c->allow_request != request))
- {
- syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname);
- return -1;
- }
-
- if(request_handlers[request](c))
- /* Something went wrong. Probably scriptkiddies. Terminate. */
- {
- syslog(LOG_ERR, _("Error while processing %s from %s (%s)"),
- request_name[request], c->name, c->hostname);
- return -1;
- }
- }
- else
- {
- syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
- c->name, c->hostname);
- return -1;
- }
-cp
- return 0;
-}
-
-int past_request_compare(past_request_t *a, past_request_t *b)
-{
-cp
- return strcmp(a->request, b->request);
-}
-
-void free_past_request(past_request_t *r)
-{
-cp
- if(r->request)
- free(r->request);
- free(r);
-cp
-}
-
-void init_requests(void)
-{
-cp
- past_request_tree = avl_alloc_tree((avl_compare_t)past_request_compare, (avl_action_t)free_past_request);
-cp
-}
-
-void exit_requests(void)
-{
-cp
- avl_delete_tree(past_request_tree);
-cp
-}
-
-int seen_request(char *request)
-{
- past_request_t p, *new;
-cp
- p.request = request;
-
- if(avl_search(past_request_tree, &p))
- {
- if(debug_lvl >= DEBUG_SCARY_THINGS)
- syslog(LOG_DEBUG, _("Already seen request"));
- return 1;
- }
- else
- {
- new = (past_request_t *)xmalloc(sizeof(*new));
- new->request = xstrdup(request);
- new->firstseen = now;
- avl_insert(past_request_tree, new);
- return 0;
- }
-cp
-}
-
-void age_past_requests(void)
-{
- avl_node_t *node, *next;
- past_request_t *p;
- int left = 0, deleted = 0;
-cp
- for(node = past_request_tree->head; node; node = next)
- {
- next = node->next;
- p = (past_request_t *)node->data;
- if(p->firstseen + pingtimeout < now)
- avl_delete_node(past_request_tree, node), deleted++;
- else
- left++;
- }
-
- if(debug_lvl >= DEBUG_SCARY_THINGS && left + deleted)
- syslog(LOG_DEBUG, _("Aging past requests: deleted %d, left %d\n"), deleted, left);
-cp
-}
-
-/* Jumptable for the request handlers */
-
-int (*request_handlers[])(connection_t*) = {
- id_h, metakey_h, challenge_h, chal_reply_h, ack_h,
- status_h, error_h, termreq_h,
- ping_h, pong_h,
- /* add_node_h, del_node_h,*/
- add_subnet_h, del_subnet_h,
- add_edge_h, del_edge_h,
- key_changed_h, req_key_h, ans_key_h,
-};
-
-/* Request names */
-
-char (*request_name[]) = {
- "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
- "STATUS", "ERROR", "TERMREQ",
- "PING", "PONG",
- /* "ADD_NODE", "DEL_NODE",*/
- "ADD_SUBNET", "DEL_SUBNET",
- "ADD_EDGE", "DEL_EDGE",
- "KEY_CHANGED", "REQ_KEY", "ANS_KEY",
-};
projects / tinc / blobdiff