/*
protocol_edge.c -- handle the meta-protocol, edges
- Copyright (C) 1999-2003 Ivo Timmermans <ivo@o2w.nl>,
- 2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 1999-2005 Ivo Timmermans,
+ 2000-2012 Guus Sliepen <guus@tinc-vpn.org>
+ 2009 Michael Tokarev <mjt@corpit.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_edge.c,v 1.1.4.18 2003/07/17 15:06:26 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 "system.h"
-#include "avl_tree.h"
#include "conf.h"
#include "connection.h"
#include "edge.h"
#include "utils.h"
#include "xalloc.h"
-int send_add_edge(connection_t *c, edge_t *e)
-{
- int x;
+bool send_add_edge(connection_t *c, const edge_t *e) {
+ bool x;
char *address, *port;
- cp();
-
sockaddr2str(&e->address, &address, &port);
- x = send_request(c, "%d %lx %s %s %s %s %lx %d", ADD_EDGE, random(),
- e->from->name, e->to->name, address, port,
- e->options, e->weight);
+ if(e->local_address.sa.sa_family) {
+ char *local_address, *local_port;
+ sockaddr2str(&e->local_address, &local_address, &local_port);
+
+ x = send_request(c, "%d %x %s %s %s %s %x %d %s %s", ADD_EDGE, rand(),
+ e->from->name, e->to->name, address, port,
+ e->options, e->weight, local_address, local_port);
+ free(local_address);
+ free(local_port);
+ } else {
+ x = send_request(c, "%d %x %s %s %s %s %x %d", ADD_EDGE, rand(),
+ e->from->name, e->to->name, address, port,
+ e->options, e->weight);
+ }
+
free(address);
free(port);
return x;
}
-int add_edge_h(connection_t *c)
-{
+bool add_edge_h(connection_t *c, const char *request) {
edge_t *e;
node_t *from, *to;
char from_name[MAX_STRING_SIZE];
char to_name[MAX_STRING_SIZE];
char to_address[MAX_STRING_SIZE];
char to_port[MAX_STRING_SIZE];
- sockaddr_t address;
- long int options;
+ char address_local[MAX_STRING_SIZE];
+ char port_local[MAX_STRING_SIZE];
+ sockaddr_t address, local_address = {{0}};
+ uint32_t options;
int weight;
- cp();
-
- if(sscanf(c->buffer, "%*d %*x "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %lx %d",
- from_name, to_name, to_address, to_port, &options, &weight) != 6) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_EDGE", c->name,
+ int parameter_count = sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %x %d "MAX_STRING" "MAX_STRING,
+ from_name, to_name, to_address, to_port, &options, &weight, address_local, port_local);
+ if (parameter_count != 6 && parameter_count != 8) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ADD_EDGE", c->name,
c->hostname);
- return -1;
+ return false;
}
/* Check if names are valid */
- if(check_id(from_name)) {
- logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name,
- c->hostname, _("invalid name"));
- return -1;
- }
-
- if(check_id(to_name)) {
- logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name,
- c->hostname, _("invalid name"));
- return -1;
+ if(!check_id(from_name) || !check_id(to_name)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_EDGE", c->name,
+ c->hostname, "invalid name");
+ return false;
}
- if(seen_request(c->buffer))
- return 0;
+ if(seen_request(request))
+ return true;
/* Lookup nodes */
from = lookup_node(from_name);
+ to = lookup_node(to_name);
+
+ if(tunnelserver &&
+ from != myself && from != c->node &&
+ to != myself && to != c->node) {
+ /* ignore indirect edge registrations for tunnelserver */
+ logger(DEBUG_PROTOCOL, LOG_WARNING,
+ "Ignoring indirect %s from %s (%s)",
+ "ADD_EDGE", c->name, c->hostname);
+ return true;
+ }
if(!from) {
from = new_node();
node_add(from);
}
- to = lookup_node(to_name);
-
if(!to) {
to = new_node();
to->name = xstrdup(to_name);
node_add(to);
}
+
/* Convert addresses */
address = str2sockaddr(to_address, to_port);
+ if(parameter_count >= 8)
+ local_address = str2sockaddr(address_local, port_local);
/* Check if edge already exists */
if(e) {
if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address)) {
if(from == myself) {
- ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself which does not match existing entry"),
+ logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself which does not match existing entry",
"ADD_EDGE", c->name, c->hostname);
send_add_edge(c, e);
- return 0;
+ sockaddrfree(&local_address);
+ return true;
} else {
- ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) which does not match existing entry"),
+ logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) which does not match existing entry",
"ADD_EDGE", c->name, c->hostname);
- edge_del(e);
+ e->options = options;
+ if(sockaddrcmp(&e->address, &address)) {
+ sockaddrfree(&e->address);
+ e->address = address;
+ }
+ if(e->weight != weight) {
+ avl_node_t *node = avl_unlink(edge_weight_tree, e);
+ e->weight = weight;
+ avl_insert_node(edge_weight_tree, node);
+ }
+
graph();
+ return true;
}
- } else
- return 0;
+ } else if(sockaddrcmp(&e->local_address, &local_address)) {
+ if(from == myself) {
+ if(e->local_address.sa.sa_family && local_address.sa.sa_family) {
+ // Someone has the wrong local address for ourself. Correct then.
+ logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself which does not match existing entry",
+ "ADD_EDGE", c->name, c->hostname);
+ send_add_edge(c, e);
+ sockaddrfree(&local_address);
+ return true;
+ }
+ // Otherwise, just ignore it.
+ sockaddrfree(&local_address);
+ return true;
+ } else if(local_address.sa.sa_family && local_address.sa.sa_family != AF_UNKNOWN) {
+ // We learned a new local address for this edge.
+ // local_address.sa.sa_family will be 0 if we got it from older tinc versions
+ // local_address.sa.sa_family will be 255 (AF_UNKNOWN) if we got it from newer versions
+ // but for edge which does not have local_address
+ sockaddrfree(&e->local_address);
+ e->local_address = local_address;
+
+ // Tell others about it.
+ if(!tunnelserver)
+ forward_request(c, request);
+
+ return true;
+ } else {
+ sockaddrfree(&local_address);
+ return true;
+ }
+ } else {
+ sockaddrfree(&local_address);
+ return true;
+ }
} else if(from == myself) {
- ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself which does not exist"),
+ logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself which does not exist",
"ADD_EDGE", c->name, c->hostname);
+ contradicting_add_edge++;
e = new_edge();
e->from = from;
e->to = to;
send_del_edge(c, e);
free_edge(e);
- return 0;
+ sockaddrfree(&local_address);
+ return true;
}
e = new_edge();
e->from = from;
e->to = to;
e->address = address;
+ e->local_address = local_address;
e->options = options;
e->weight = weight;
edge_add(e);
/* Tell the rest about the new edge */
- forward_request(c);
+ if(!tunnelserver)
+ forward_request(c, request);
/* Run MST before or after we tell the rest? */
graph();
- return 0;
+ return true;
}
-int send_del_edge(connection_t *c, edge_t *e)
-{
- cp();
-
- return send_request(c, "%d %lx %s %s", DEL_EDGE, random(),
+bool send_del_edge(connection_t *c, const edge_t *e) {
+ return send_request(c, "%d %x %s %s", DEL_EDGE, rand(),
e->from->name, e->to->name);
}
-int del_edge_h(connection_t *c)
-{
+bool del_edge_h(connection_t *c, const char *request) {
edge_t *e;
char from_name[MAX_STRING_SIZE];
char to_name[MAX_STRING_SIZE];
node_t *from, *to;
- cp();
-
- if(sscanf(c->buffer, "%*d %*x "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_EDGE", c->name,
+ if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "DEL_EDGE", c->name,
c->hostname);
- return -1;
+ return false;
}
/* Check if names are valid */
- if(check_id(from_name)) {
- logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name,
- c->hostname, _("invalid name"));
- return -1;
+ if(!check_id(from_name) || !check_id(to_name)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_EDGE", c->name,
+ c->hostname, "invalid name");
+ return false;
}
- if(check_id(to_name)) {
- logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name,
- c->hostname, _("invalid name"));
- return -1;
- }
-
- if(seen_request(c->buffer))
- return 0;
+ if(seen_request(request))
+ return true;
/* Lookup nodes */
from = lookup_node(from_name);
+ to = lookup_node(to_name);
+
+ if(tunnelserver &&
+ from != myself && from != c->node &&
+ to != myself && to != c->node) {
+ /* ignore indirect edge registrations for tunnelserver */
+ logger(DEBUG_PROTOCOL, LOG_WARNING,
+ "Ignoring indirect %s from %s (%s)",
+ "DEL_EDGE", c->name, c->hostname);
+ return true;
+ }
if(!from) {
- ifdebug(PROTOCOL) logger(LOG_ERR, _("Got %s from %s (%s) which does not appear in the edge tree"),
+ logger(DEBUG_PROTOCOL, LOG_ERR, "Got %s from %s (%s) which does not appear in the edge tree",
"DEL_EDGE", c->name, c->hostname);
- return 0;
+ return true;
}
- to = lookup_node(to_name);
-
if(!to) {
- ifdebug(PROTOCOL) logger(LOG_ERR, _("Got %s from %s (%s) which does not appear in the edge tree"),
+ logger(DEBUG_PROTOCOL, LOG_ERR, "Got %s from %s (%s) which does not appear in the edge tree",
"DEL_EDGE", c->name, c->hostname);
- return 0;
+ return true;
}
/* Check if edge exists */
e = lookup_edge(from, to);
if(!e) {
- ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) which does not appear in the edge tree"),
+ logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) which does not appear in the edge tree",
"DEL_EDGE", c->name, c->hostname);
- return 0;
+ return true;
}
if(e->from == myself) {
- ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself"),
+ logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself",
"DEL_EDGE", c->name, c->hostname);
- send_add_edge(c, e); /* Send back a correction */
- return 0;
+ contradicting_del_edge++;
+ send_add_edge(c, e); /* Send back a correction */
+ return true;
}
/* Tell the rest about the deleted edge */
- forward_request(c);
+ if(!tunnelserver)
+ forward_request(c, request);
/* Delete the edge */
graph();
- return 0;
+ /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
+
+ if(!to->status.reachable) {
+ e = lookup_edge(to, myself);
+ if(e) {
+ if(!tunnelserver)
+ send_del_edge(everyone, e);
+ edge_del(e);
+ }
+ }
+
+ return true;
}
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