+++ /dev/null
-/*
- protocol_subnet.c -- handle the meta-protocol, subnets
- Copyright (C) 1999-2005 Ivo Timmermans,
- 2000-2012 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
- 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.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-
-#include "system.h"
-
-#include "conf.h"
-#include "connection.h"
-#include "logger.h"
-#include "net.h"
-#include "netutl.h"
-#include "node.h"
-#include "protocol.h"
-#include "subnet.h"
-#include "utils.h"
-#include "xalloc.h"
-
-bool send_add_subnet(connection_t *c, const subnet_t *subnet) {
- char netstr[MAXNETSTR];
-
- if(!net2str(netstr, sizeof netstr, subnet))
- return false;
-
- return send_request(c, "%d %x %s %s", ADD_SUBNET, rand(), subnet->owner->name, netstr);
-}
-
-bool add_subnet_h(connection_t *c, const char *request) {
- char subnetstr[MAX_STRING_SIZE];
- char name[MAX_STRING_SIZE];
- node_t *owner;
- subnet_t s = {NULL}, *new, *old;
-
- if(sscanf(request, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
- logger(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_SUBNET", c->name,
- c->hostname, "invalid subnet string");
- return false;
- }
-
- if(seen_request(request))
- 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 */
- logger(DEBUG_PROTOCOL, 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) {
- logger(DEBUG_PROTOCOL, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, LOG_WARNING, "Ignoring unauthorized %s from %s (%s): %s",
- "ADD_SUBNET", c->name, c->hostname, subnetstr);
- forward_request(c, request);
- 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 */
-
- if(!tunnelserver)
- forward_request(c, request);
-
- /* Fast handoff of roaming MAC addresses */
-
- if(s.type == SUBNET_MAC && owner != myself && (old = lookup_subnet(myself, &s)) && old->expires)
- old->expires = 1;
-
- return true;
-}
-
-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);
-}
-
-bool del_subnet_h(connection_t *c, const char *request) {
- char subnetstr[MAX_STRING_SIZE];
- char name[MAX_STRING_SIZE];
- node_t *owner;
- subnet_t s = {NULL}, *find;
-
- if(sscanf(request, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
- logger(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_SUBNET", c->name,
- c->hostname, "invalid subnet string");
- return false;
- }
-
- if(seen_request(request))
- 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 */
- logger(DEBUG_PROTOCOL, LOG_WARNING, "Ignoring indirect %s from %s (%s) for %s",
- "DEL_SUBNET", c->name, c->hostname, subnetstr);
- return true;
- }
-
- if(!owner) {
- logger(DEBUG_PROTOCOL, 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) {
- logger(DEBUG_PROTOCOL, 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, request);
- return true;
- }
-
- /* If we are the owner of this subnet, retaliate with an ADD_SUBNET */
-
- if(owner == myself) {
- logger(DEBUG_PROTOCOL, 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 */
-
- if(!tunnelserver)
- forward_request(c, request);
- if(strictsubnets)
- return true;
-
- /* Finally, delete it. */
-
- if(owner->status.reachable)
- subnet_update(owner, find, false);
-
- subnet_del(owner, find);
-
- return true;
-}
projects / meshlink / blobdiff