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tinc/src/protocol_edge.c
Guus Sliepen 8b2b67e26c Generalized request broadcasting/forwarding.
2002-09-04 16:26:45 +00:00

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/*
protocol_edge.c -- handle the meta-protocol, edges
Copyright (C) 1999-2002 Ivo Timmermans <ivo@o2w.nl>,
2000-2002 Guus Sliepen <guus@sliepen.eu.org>
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_edge.c,v 1.1.4.10 2002/09/04 16:26:45 guus Exp $
*/
#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 "conf.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
#include "meta.h"
#include "connection.h"
#include "node.h"
#include "edge.h"
#include "graph.h"
#include "system.h"
int send_add_edge(connection_t *c, edge_t *e)
{
int 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);
free(address);
free(port);
cp
return x;
}
int add_edge_h(connection_t *c)
{
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;
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)
{
syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_EDGE", c->name, c->hostname);
return -1;
}
/* Check if names are valid */
if(check_id(from_name))
{
syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name"));
return -1;
}
if(check_id(to_name))
{
syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name"));
return -1;
}
if(seen_request(c->buffer))
return 0;
/* Lookup nodes */
from = lookup_node(from_name);
if(!from)
{
from = new_node();
from->name = xstrdup(from_name);
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);
/* Check if edge already exists */
e = lookup_edge(from, to);
if(e)
{
if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address))
{
if(from == myself)
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(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;
}
else
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_WARNING, _("Got %s from %s (%s) which does not match existing entry"), "ADD_EDGE", c->name, c->hostname);
edge_del(e);
}
}
else
return 0;
}
else if(from == myself)
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself which does not exist"), "ADD_EDGE", c->name, c->hostname);
e = new_edge();
e->from = from;
e->to = to;
send_del_edge(c, e);
free_edge(e);
return 0;
}
e = new_edge();
e->from = from;
e->to = to;
e->address = address;
e->options = options;
e->weight = weight;
edge_add(e);
/* Tell the rest about the new edge */
forward_request(c);
/* Run MST before or after we tell the rest? */
graph();
cp
return 0;
}
int send_del_edge(connection_t *c, edge_t *e)
{
cp
return send_request(c, "%d %lx %s %s", DEL_EDGE, random(),
e->from->name, e->to->name);
}
int del_edge_h(connection_t *c)
{
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)
{
syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_EDGE",
c->name, c->hostname);
return -1;
}
/* Check if names are valid */
if(check_id(from_name))
{
syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("invalid name"));
return -1;
}
if(check_id(to_name))
{
syslog(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;
/* Lookup nodes */
from = lookup_node(from_name);
if(!from)
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_ERR, _("Got %s from %s (%s) which does not appear in the edge tree"), "DEL_EDGE", c->name, c->hostname);
return 0;
}
to = lookup_node(to_name);
if(!to)
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_ERR, _("Got %s from %s (%s) which does not appear in the edge tree"), "DEL_EDGE", c->name, c->hostname);
return 0;
}
/* Check if edge exists */
e = lookup_edge(from, to);
if(!e)
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_WARNING, _("Got %s from %s (%s) which does not appear in the edge tree"), "DEL_EDGE", c->name, c->hostname);
return 0;
}
if(e->from == myself)
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(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;
}
/* Tell the rest about the deleted edge */
forward_request(c);
/* Delete the edge */
edge_del(e);
/* Run MST before or after we tell the rest? */
graph();
cp
return 0;
}
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