/*
protocol_subnet.c -- handle the meta-protocol, subnets
- Copyright (C) 1999-2002 Ivo Timmermans <ivo@o2w.nl>,
- 2000-2002 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 1999-2005 Ivo Timmermans,
+ 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
+ 2009 Michael Tokarev <mjt@tls.msk.ru>
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
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_subnet.c,v 1.1.4.5 2002/09/03 20:43:26 guus Exp $
+ 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.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "config.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <errno.h>
-
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
+#include "system.h"
#include "conf.h"
+#include "connection.h"
+#include "logger.h"
#include "net.h"
#include "netutl.h"
-#include "protocol.h"
-#include "meta.h"
-#include "connection.h"
#include "node.h"
+#include "protocol.h"
+#include "subnet.h"
+#include "utils.h"
+#include "xalloc.h"
-#include "system.h"
+bool send_add_subnet(connection_t *c, const subnet_t *subnet) {
+ char netstr[MAXNETSTR];
+
+ if(!net2str(netstr, sizeof netstr, subnet))
+ return false;
-int send_add_subnet(connection_t *c, subnet_t *subnet)
-{
- int x;
- char *netstr;
-cp
- x = send_request(c, "%d %lx %s %s", ADD_SUBNET, random(),
- subnet->owner->name, netstr = net2str(subnet));
- free(netstr);
-cp
- return x;
+ return send_request(c, "%d %x %s %s", ADD_SUBNET, rand(), subnet->owner->name, netstr);
}
-int add_subnet_h(connection_t *c)
-{
- char subnetstr[MAX_STRING_SIZE];
- char name[MAX_STRING_SIZE];
- node_t *owner;
- connection_t *other;
- subnet_t *s;
- avl_node_t *node;
-cp
- if(sscanf(c->buffer, "%*d %*x "MAX_STRING" "MAX_STRING, name, subnetstr) != 2)
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_SUBNET", c->name, c->hostname);
- return -1;
- }
-
- /* Check if owner name is a valid */
-
- if(check_id(name))
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid name"));
- return -1;
- }
-
- /* Check if subnet string is valid */
-
- if(!(s = str2net(subnetstr)))
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid subnet string"));
- return -1;
- }
-
- if(seen_request(c->buffer))
- return 0;
-
- /* Check if the owner of the new subnet is in the connection list */
-
- owner = lookup_node(name);
-
- if(!owner)
- {
- owner = new_node();
- owner->name = xstrdup(name);
- node_add(owner);
- }
-
- /* Check if we already know this subnet */
-
- if(lookup_subnet(owner, s))
- {
- free_subnet(s);
- return 0;
- }
-
- /* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */
-
- if(owner == myself)
- {
- if(debug_lvl >= DEBUG_PROTOCOL)
- syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself"), "ADD_SUBNET", c->name, c->hostname);
- s->owner = myself;
- send_del_subnet(c, s);
- return 0;
- }
-
- /* If everything is correct, add the subnet to the list of the owner */
-
- subnet_add(owner, s);
-
- /* Tell the rest */
-
- for(node = connection_tree->head; node; node = node->next)
- {
- other = (connection_t *)node->data;
- if(other->status.active && other != c)
- send_request(other, "%s", c->buffer);
- }
-cp
- return 0;
+bool add_subnet_h(connection_t *c) {
+ char subnetstr[MAX_STRING_SIZE];
+ char name[MAX_STRING_SIZE];
+ node_t *owner;
+ subnet_t s = {NULL}, *new, *old;
+
+ if(sscanf(c->buffer, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "ADD_SUBNET", c->name,
+ c->hostname);
+ return false;
+ }
+
+ /* Check if owner name is valid */
+
+ if(!check_id(name)) {
+ logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_SUBNET", c->name,
+ c->hostname, "invalid name");
+ return false;
+ }
+
+ /* Check if subnet string is valid */
+
+ if(!str2net(&s, subnetstr)) {
+ logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_SUBNET", c->name,
+ c->hostname, "invalid subnet string");
+ return false;
+ }
+
+ if(seen_request(c->buffer))
+ return true;
+
+ /* Check if the owner of the new subnet is in the connection list */
+
+ owner = lookup_node(name);
+
+ if(tunnelserver && owner != myself && owner != c->node) {
+ /* in case of tunnelserver, ignore indirect subnet registrations */
+ ifdebug(PROTOCOL) logger(LOG_WARNING, "Ignoring indirect %s from %s (%s) for %s",
+ "ADD_SUBNET", c->name, c->hostname, subnetstr);
+ return true;
+ }
+
+ if(!owner) {
+ owner = new_node();
+ owner->name = xstrdup(name);
+ node_add(owner);
+ }
+
+ /* Check if we already know this subnet */
+
+ if(lookup_subnet(owner, &s))
+ return true;
+
+ /* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */
+
+ if(owner == myself) {
+ ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for ourself",
+ "ADD_SUBNET", c->name, c->hostname);
+ s.owner = myself;
+ send_del_subnet(c, &s);
+ return true;
+ }
+
+ /* In tunnel server mode, we should already know all allowed subnets */
+
+ if(tunnelserver) {
+ logger(LOG_WARNING, "Ignoring unauthorized %s from %s (%s): %s",
+ "ADD_SUBNET", c->name, c->hostname, subnetstr);
+ return true;
+ }
+
+ /* Ignore if strictsubnets is true, but forward it to others */
+
+ if(strictsubnets) {
+ logger(LOG_WARNING, "Ignoring unauthorized %s from %s (%s): %s",
+ "ADD_SUBNET", c->name, c->hostname, subnetstr);
+ forward_request(c);
+ return true;
+ }
+
+ /* If everything is correct, add the subnet to the list of the owner */
+
+ *(new = new_subnet()) = s;
+ subnet_add(owner, new);
+
+ if(owner->status.reachable)
+ subnet_update(owner, new, true);
+
+ /* Tell the rest */
+
+ forward_request(c);
+
+ /* Fast handoff of roaming MAC addresses */
+
+ if(s.type == SUBNET_MAC && owner != myself && (old = lookup_subnet(myself, &s)) && old->expires)
+ old->expires = now;
+
+ return true;
}
-int send_del_subnet(connection_t *c, subnet_t *s)
-{
- int x;
- char *netstr;
-cp
- netstr = net2str(s);
- x = send_request(c, "%d %lx %s %s", DEL_SUBNET, random(), s->owner->name, netstr);
- free(netstr);
-cp
- return x;
+bool send_del_subnet(connection_t *c, const subnet_t *s) {
+ char netstr[MAXNETSTR];
+
+ if(!net2str(netstr, sizeof netstr, s))
+ return false;
+
+ return send_request(c, "%d %x %s %s", DEL_SUBNET, rand(), s->owner->name, netstr);
}
-int del_subnet_h(connection_t *c)
-{
- char subnetstr[MAX_STRING_SIZE];
- char name[MAX_STRING_SIZE];
- node_t *owner;
- connection_t *other;
- subnet_t *s, *find;
- avl_node_t *node;
-cp
- if(sscanf(c->buffer, "%*d %*x "MAX_STRING" "MAX_STRING, name, subnetstr) != 2)
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_SUBNET", c->name, c->hostname);
- return -1;
- }
-
- /* Check if owner name is a valid */
-
- if(check_id(name))
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid name"));
- return -1;
- }
-
- /* Check if the owner of the new subnet is in the connection list */
-
- if(!(owner = lookup_node(name)))
- {
- if(debug_lvl >= DEBUG_PROTOCOL)
- syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which is not in our node tree"),
- "DEL_SUBNET", c->name, c->hostname, name);
- return 0;
- }
-
- /* Check if subnet string is valid */
-
- if(!(s = str2net(subnetstr)))
- {
- syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid subnet string"));
- return -1;
- }
-
- if(seen_request(c->buffer))
- return 0;
-
- /* If everything is correct, delete the subnet from the list of the owner */
-
- s->owner = owner;
-
- find = lookup_subnet(owner, s);
-
- free_subnet(s);
-
- if(!find)
- {
- if(debug_lvl >= DEBUG_PROTOCOL)
- syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which does not appear in his subnet tree"),
- "DEL_SUBNET", c->name, c->hostname, name);
- return 0;
- }
-
- /* If we are the owner of this subnet, retaliate with an ADD_SUBNET */
-
- if(owner == myself)
- {
- if(debug_lvl >= DEBUG_PROTOCOL)
- syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself"), "DEL_SUBNET", c->name, c->hostname);
- send_add_subnet(c, find);
- return 0;
- }
-
- /* Tell the rest */
-
- for(node = connection_tree->head; node; node = node->next)
- {
- other = (connection_t *)node->data;
- if(other->status.active && other != c)
- send_request(other, "%s", c->buffer);
- }
-
- /* Finally, delete it. */
-
- subnet_del(owner, find);
-
-cp
- return 0;
+bool del_subnet_h(connection_t *c) {
+ char subnetstr[MAX_STRING_SIZE];
+ char name[MAX_STRING_SIZE];
+ node_t *owner;
+ subnet_t s = {NULL}, *find;
+
+ if(sscanf(c->buffer, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "DEL_SUBNET", c->name,
+ c->hostname);
+ return false;
+ }
+
+ /* Check if owner name is valid */
+
+ if(!check_id(name)) {
+ logger(LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_SUBNET", c->name,
+ c->hostname, "invalid name");
+ return false;
+ }
+
+ /* Check if subnet string is valid */
+
+ if(!str2net(&s, subnetstr)) {
+ logger(LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_SUBNET", c->name,
+ c->hostname, "invalid subnet string");
+ return false;
+ }
+
+ if(seen_request(c->buffer))
+ return true;
+
+ /* Check if the owner of the subnet being deleted is in the connection list */
+
+ owner = lookup_node(name);
+
+ if(tunnelserver && owner != myself && owner != c->node) {
+ /* in case of tunnelserver, ignore indirect subnet deletion */
+ ifdebug(PROTOCOL) logger(LOG_WARNING, "Ignoring indirect %s from %s (%s) for %s",
+ "DEL_SUBNET", c->name, c->hostname, subnetstr);
+ return true;
+ }
+
+ if(!owner) {
+ ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for %s which is not in our node tree",
+ "DEL_SUBNET", c->name, c->hostname, name);
+ return true;
+ }
+
+ /* If everything is correct, delete the subnet from the list of the owner */
+
+ s.owner = owner;
+
+ find = lookup_subnet(owner, &s);
+
+ if(!find) {
+ ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for %s which does not appear in his subnet tree",
+ "DEL_SUBNET", c->name, c->hostname, name);
+ if(strictsubnets)
+ forward_request(c);
+ return true;
+ }
+
+ /* If we are the owner of this subnet, retaliate with an ADD_SUBNET */
+
+ if(owner == myself) {
+ ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for ourself",
+ "DEL_SUBNET", c->name, c->hostname);
+ send_add_subnet(c, find);
+ return true;
+ }
+
+ if(tunnelserver)
+ return true;
+
+ /* Tell the rest */
+
+ forward_request(c);
+ if(strictsubnets)
+ return true;
+
+ /* Finally, delete it. */
+
+ if(owner->status.reachable)
+ subnet_update(owner, find, false);
+
+ subnet_del(owner, find);
+
+ return true;
}
projects / tinc / blobdiff