2002-02-11 10:05:58 +00:00
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/*
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protocol_auth.c -- handle the meta-protocol, authentication
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Copyright (C) 1999-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
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2000-2002 Guus Sliepen <guus@sliepen.warande.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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2002-03-23 20:01:05 +00:00
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$Id: protocol_auth.c,v 1.1.4.6 2002/03/23 20:01:05 guus Exp $
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2002-02-11 10:05:58 +00:00
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <utils.h>
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#include <xalloc.h>
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#include <avl_tree.h>
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#include <openssl/sha.h>
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#include <openssl/rand.h>
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#include <openssl/evp.h>
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#ifndef HAVE_RAND_PSEUDO_BYTES
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#define RAND_pseudo_bytes RAND_bytes
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#endif
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#include "conf.h"
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#include "net.h"
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#include "netutl.h"
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#include "protocol.h"
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#include "meta.h"
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#include "connection.h"
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#include "node.h"
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#include "edge.h"
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#include "graph.h"
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#include "system.h"
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int send_id(connection_t *c)
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{
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cp
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return send_request(c, "%d %s %d", ID, myself->connection->name, myself->connection->protocol_version);
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}
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int id_h(connection_t *c)
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{
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char name[MAX_STRING_SIZE];
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int bla;
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cp
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if(sscanf(c->buffer, "%*d "MAX_STRING" %d", name, &c->protocol_version) != 2)
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{
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syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ID", c->name, c->hostname);
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return -1;
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}
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/* Check if identity is a valid name */
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if(check_id(name))
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{
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syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ID", c->name, c->hostname, "invalid name");
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return -1;
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}
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/* If we set c->name in advance, make sure we are connected to the right host */
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if(c->name)
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{
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if(strcmp(c->name, name))
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{
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syslog(LOG_ERR, _("Peer %s is %s instead of %s"), c->hostname, name, c->name);
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return -1;
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}
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}
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else
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c->name = xstrdup(name);
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/* Check if version matches */
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if(c->protocol_version != myself->connection->protocol_version)
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{
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syslog(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"),
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c->name, c->hostname, c->protocol_version);
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return -1;
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}
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if(bypass_security)
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{
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if(!c->config_tree)
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init_configuration(&c->config_tree);
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c->allow_request = ACK;
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return send_ack(c);
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}
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if(!c->config_tree)
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{
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init_configuration(&c->config_tree);
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if((bla = read_connection_config(c)))
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{
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syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), c->hostname, c->name);
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return -1;
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}
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}
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if(read_rsa_public_key(c))
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{
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return -1;
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}
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/* Check some options */
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if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &bla) && bla) || myself->options & OPTION_INDIRECT)
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c->options |= OPTION_INDIRECT;
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if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &bla) && bla) || myself->options & OPTION_TCPONLY)
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c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
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c->allow_request = METAKEY;
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cp
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return send_metakey(c);
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}
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int send_metakey(connection_t *c)
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{
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char buffer[MAX_STRING_SIZE];
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int len, x;
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cp
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len = RSA_size(c->rsa_key);
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/* Allocate buffers for the meta key */
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if(!c->outkey)
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c->outkey = xmalloc(len);
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if(!c->outctx)
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c->outctx = xmalloc(sizeof(*c->outctx));
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cp
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/* Copy random data to the buffer */
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RAND_bytes(c->outkey, len);
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/* The message we send must be smaller than the modulus of the RSA key.
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By definition, for a key of k bits, the following formula holds:
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2^(k-1) <= modulus < 2^(k)
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Where ^ means "to the power of", not "xor".
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This means that to be sure, we must choose our message < 2^(k-1).
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This can be done by setting the most significant bit to zero.
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*/
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c->outkey[0] &= 0x7F;
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if(debug_lvl >= DEBUG_SCARY_THINGS)
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{
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bin2hex(c->outkey, buffer, len);
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buffer[len*2] = '\0';
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syslog(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"), buffer);
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}
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/* Encrypt the random data
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We do not use one of the PKCS padding schemes here.
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This is allowed, because we encrypt a totally random string
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with a length equal to that of the modulus of the RSA key.
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*/
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if(RSA_public_encrypt(len, c->outkey, buffer, c->rsa_key, RSA_NO_PADDING) != len)
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{
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syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname);
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return -1;
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}
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cp
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/* Convert the encrypted random data to a hexadecimal formatted string */
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bin2hex(buffer, buffer, len);
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buffer[len*2] = '\0';
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/* Send the meta key */
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2002-02-20 19:25:09 +00:00
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x = send_request(c, "%d %d %d %d %d %s", METAKEY,
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c->outcipher?c->outcipher->nid:0, c->outdigest?c->outdigest->type:0,
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c->outmaclength, c->outcompression, buffer);
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2002-02-11 10:05:58 +00:00
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/* Further outgoing requests are encrypted with the key we just generated */
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2002-02-20 19:25:09 +00:00
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if(c->outcipher)
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{
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EVP_EncryptInit(c->outctx, c->outcipher,
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c->outkey + len - c->outcipher->key_len,
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c->outkey + len - c->outcipher->key_len - c->outcipher->iv_len);
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2002-02-11 10:05:58 +00:00
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2002-02-20 19:25:09 +00:00
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c->status.encryptout = 1;
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}
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2002-02-11 10:05:58 +00:00
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cp
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return x;
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}
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int metakey_h(connection_t *c)
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{
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char buffer[MAX_STRING_SIZE];
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2002-02-20 19:25:09 +00:00
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int cipher, digest, maclength, compression;
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2002-02-11 10:05:58 +00:00
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int len;
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cp
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2002-02-20 19:25:09 +00:00
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if(sscanf(c->buffer, "%*d %d %d %d %d "MAX_STRING, &cipher, &digest, &maclength, &compression, buffer) != 5)
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2002-02-11 10:05:58 +00:00
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{
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syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name, c->hostname);
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return -1;
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}
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cp
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len = RSA_size(myself->connection->rsa_key);
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/* Check if the length of the meta key is all right */
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if(strlen(buffer) != len*2)
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{
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syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength");
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return -1;
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}
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/* Allocate buffers for the meta key */
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cp
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if(!c->inkey)
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c->inkey = xmalloc(len);
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if(!c->inctx)
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c->inctx = xmalloc(sizeof(*c->inctx));
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/* Convert the challenge from hexadecimal back to binary */
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cp
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hex2bin(buffer,buffer,len);
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/* Decrypt the meta key */
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cp
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if(RSA_private_decrypt(len, buffer, c->inkey, myself->connection->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */
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{
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syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname);
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return -1;
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}
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if(debug_lvl >= DEBUG_SCARY_THINGS)
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{
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bin2hex(c->inkey, buffer, len);
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buffer[len*2] = '\0';
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syslog(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), buffer);
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}
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/* All incoming requests will now be encrypted. */
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cp
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2002-02-20 19:25:09 +00:00
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/* Check and lookup cipher and digest algorithms */
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if(cipher)
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{
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c->incipher = EVP_get_cipherbynid(cipher);
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if(!c->incipher)
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{
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syslog(LOG_ERR, _("%s (%s) uses unknown cipher!"), c->name, c->hostname);
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return -1;
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}
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EVP_DecryptInit(c->inctx, c->incipher,
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c->inkey + len - c->incipher->key_len,
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c->inkey + len - c->incipher->key_len - c->incipher->iv_len);
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c->status.decryptin = 1;
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}
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else
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{
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c->incipher = NULL;
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}
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c->inmaclength = maclength;
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if(digest)
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{
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c->indigest = EVP_get_digestbynid(digest);
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if(!c->indigest)
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{
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syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), c->name, c->hostname);
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return -1;
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}
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if(c->inmaclength > c->indigest->md_size || c->inmaclength < 0)
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{
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syslog(LOG_ERR, _("%s (%s) uses bogus MAC length!"), c->name, c->hostname);
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return -1;
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}
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}
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else
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{
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c->indigest = NULL;
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}
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c->incompression = compression;
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2002-02-11 10:05:58 +00:00
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c->allow_request = CHALLENGE;
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cp
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return send_challenge(c);
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}
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int send_challenge(connection_t *c)
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{
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char buffer[MAX_STRING_SIZE];
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int len, x;
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cp
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/* CHECKME: what is most reasonable value for len? */
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len = RSA_size(c->rsa_key);
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/* Allocate buffers for the challenge */
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if(!c->hischallenge)
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c->hischallenge = xmalloc(len);
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cp
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/* Copy random data to the buffer */
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RAND_bytes(c->hischallenge, len);
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cp
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/* Convert to hex */
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bin2hex(c->hischallenge, buffer, len);
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buffer[len*2] = '\0';
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cp
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/* Send the challenge */
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x = send_request(c, "%d %s", CHALLENGE, buffer);
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cp
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return x;
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}
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int challenge_h(connection_t *c)
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{
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char buffer[MAX_STRING_SIZE];
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int len;
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cp
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if(sscanf(c->buffer, "%*d "MAX_STRING, buffer) != 1)
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{
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syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name, c->hostname);
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return -1;
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}
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len = RSA_size(myself->connection->rsa_key);
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/* Check if the length of the challenge is all right */
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if(strlen(buffer) != len*2)
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{
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syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong challenge length");
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return -1;
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}
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/* Allocate buffers for the challenge */
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if(!c->mychallenge)
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c->mychallenge = xmalloc(len);
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/* Convert the challenge from hexadecimal back to binary */
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hex2bin(buffer,c->mychallenge,len);
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|
|
c->allow_request = CHAL_REPLY;
|
|
|
|
|
|
|
|
/* Rest is done by send_chal_reply() */
|
|
|
|
cp
|
|
|
|
return send_chal_reply(c);
|
|
|
|
}
|
|
|
|
|
|
|
|
int send_chal_reply(connection_t *c)
|
|
|
|
{
|
2002-02-20 19:25:09 +00:00
|
|
|
char hash[EVP_MAX_MD_SIZE*2+1];
|
|
|
|
EVP_MD_CTX ctx;
|
2002-02-11 10:05:58 +00:00
|
|
|
cp
|
|
|
|
/* Calculate the hash from the challenge we received */
|
|
|
|
|
2002-02-20 19:25:09 +00:00
|
|
|
EVP_DigestInit(&ctx, c->indigest);
|
|
|
|
EVP_DigestUpdate(&ctx, c->mychallenge, RSA_size(myself->connection->rsa_key));
|
|
|
|
EVP_DigestFinal(&ctx, hash, NULL);
|
2002-02-11 10:05:58 +00:00
|
|
|
|
|
|
|
/* Convert the hash to a hexadecimal formatted string */
|
|
|
|
|
2002-02-20 19:25:09 +00:00
|
|
|
bin2hex(hash,hash,c->indigest->md_size);
|
|
|
|
hash[c->indigest->md_size*2] = '\0';
|
2002-02-11 10:05:58 +00:00
|
|
|
|
|
|
|
/* Send the reply */
|
|
|
|
|
|
|
|
cp
|
|
|
|
return send_request(c, "%d %s", CHAL_REPLY, hash);
|
|
|
|
}
|
|
|
|
|
|
|
|
int chal_reply_h(connection_t *c)
|
|
|
|
{
|
|
|
|
char hishash[MAX_STRING_SIZE];
|
2002-02-20 19:25:09 +00:00
|
|
|
char myhash[EVP_MAX_MD_SIZE];
|
|
|
|
EVP_MD_CTX ctx;
|
2002-02-11 10:05:58 +00:00
|
|
|
cp
|
|
|
|
if(sscanf(c->buffer, "%*d "MAX_STRING, hishash) != 1)
|
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "CHAL_REPLY", c->name, c->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if the length of the hash is all right */
|
|
|
|
|
2002-02-20 19:25:09 +00:00
|
|
|
if(strlen(hishash) != c->outdigest->md_size*2)
|
2002-02-11 10:05:58 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply length"));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Convert the hash to binary format */
|
|
|
|
|
2002-02-20 19:25:09 +00:00
|
|
|
hex2bin(hishash, hishash, c->outdigest->md_size);
|
2002-02-11 10:05:58 +00:00
|
|
|
|
|
|
|
/* Calculate the hash from the challenge we sent */
|
|
|
|
|
2002-02-20 19:25:09 +00:00
|
|
|
EVP_DigestInit(&ctx, c->outdigest);
|
|
|
|
EVP_DigestUpdate(&ctx, c->hischallenge, RSA_size(c->rsa_key));
|
|
|
|
EVP_DigestFinal(&ctx, myhash, NULL);
|
2002-02-11 10:05:58 +00:00
|
|
|
|
|
|
|
/* Verify the incoming hash with the calculated hash */
|
|
|
|
|
2002-02-20 19:25:09 +00:00
|
|
|
if(memcmp(hishash, myhash, c->outdigest->md_size))
|
2002-02-11 10:05:58 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply"));
|
|
|
|
if(debug_lvl >= DEBUG_SCARY_THINGS)
|
|
|
|
{
|
|
|
|
bin2hex(myhash, hishash, SHA_DIGEST_LENGTH);
|
|
|
|
hishash[SHA_DIGEST_LENGTH*2] = '\0';
|
|
|
|
syslog(LOG_DEBUG, _("Expected challenge reply: %s"), hishash);
|
|
|
|
}
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Identity has now been positively verified.
|
|
|
|
Send an acknowledgement with the rest of the information needed.
|
|
|
|
*/
|
|
|
|
|
|
|
|
c->allow_request = ACK;
|
|
|
|
cp
|
|
|
|
return send_ack(c);
|
|
|
|
}
|
|
|
|
|
|
|
|
int send_ack(connection_t *c)
|
|
|
|
{
|
|
|
|
/* ACK message contains rest of the information the other end needs
|
|
|
|
to create node_t and edge_t structures. */
|
|
|
|
|
|
|
|
int x;
|
2002-02-18 16:25:19 +00:00
|
|
|
char *address, *port;
|
2002-02-11 10:05:58 +00:00
|
|
|
struct timeval now;
|
|
|
|
cp
|
|
|
|
/* Estimate weight */
|
|
|
|
|
|
|
|
gettimeofday(&now, NULL);
|
|
|
|
c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000;
|
2002-02-18 16:25:19 +00:00
|
|
|
sockaddr2str(&c->address, &address, &port);
|
2002-03-23 20:01:05 +00:00
|
|
|
x = send_request(c, "%d %s %s %d %lx", ACK, myport, address, c->estimated_weight, c->options);
|
2002-02-18 16:25:19 +00:00
|
|
|
free(address);
|
|
|
|
free(port);
|
2002-02-11 10:05:58 +00:00
|
|
|
cp
|
|
|
|
return x;
|
|
|
|
}
|
|
|
|
|
|
|
|
void send_everything(connection_t *c)
|
|
|
|
{
|
|
|
|
avl_node_t *node, *node2;
|
|
|
|
node_t *n;
|
|
|
|
subnet_t *s;
|
|
|
|
edge_t *e;
|
|
|
|
|
|
|
|
/* Send all known subnets */
|
|
|
|
|
|
|
|
for(node = node_tree->head; node; node = node->next)
|
|
|
|
{
|
|
|
|
n = (node_t *)node->data;
|
|
|
|
|
|
|
|
for(node2 = n->subnet_tree->head; node2; node2 = node2->next)
|
|
|
|
{
|
|
|
|
s = (subnet_t *)node2->data;
|
|
|
|
send_add_subnet(c, s);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Send all known edges */
|
|
|
|
|
|
|
|
for(node = edge_tree->head; node; node = node->next)
|
|
|
|
{
|
|
|
|
e = (edge_t *)node->data;
|
|
|
|
|
|
|
|
if(e == c->edge)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
send_add_edge(c, e);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
int ack_h(connection_t *c)
|
|
|
|
{
|
2002-03-22 11:43:48 +00:00
|
|
|
char myaddress[MAX_STRING_SIZE];
|
2002-02-18 16:25:19 +00:00
|
|
|
char hisport[MAX_STRING_SIZE];
|
|
|
|
char *hisaddress, *dummy;
|
2002-02-11 10:05:58 +00:00
|
|
|
int weight;
|
2002-03-22 13:31:18 +00:00
|
|
|
long int options;
|
2002-02-11 10:05:58 +00:00
|
|
|
node_t *n;
|
|
|
|
connection_t *other;
|
|
|
|
avl_node_t *node;
|
|
|
|
cp
|
2002-03-22 13:31:18 +00:00
|
|
|
if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" %d %lx", hisport, myaddress, &weight, &options) != 4)
|
2002-02-11 10:05:58 +00:00
|
|
|
{
|
|
|
|
syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ACK", c->name, c->hostname);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Check if we already have a node_t for him */
|
|
|
|
|
|
|
|
n = lookup_node(c->name);
|
|
|
|
|
|
|
|
if(!n)
|
|
|
|
{
|
|
|
|
n = new_node();
|
|
|
|
n->name = xstrdup(c->name);
|
|
|
|
node_add(n);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
if(n->connection)
|
|
|
|
{
|
|
|
|
/* Oh dear, we already have a connection to this node. */
|
|
|
|
if(debug_lvl >= DEBUG_CONNECTIONS)
|
|
|
|
syslog(LOG_DEBUG, _("Established a second connection with %s (%s), closing old connection"), n->name, n->hostname);
|
|
|
|
terminate_connection(n->connection, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* FIXME: check if information in existing node matches that of the other end of this connection */
|
|
|
|
}
|
|
|
|
|
|
|
|
n->connection = c;
|
|
|
|
c->node = n;
|
|
|
|
c->options |= options;
|
|
|
|
|
|
|
|
/* Create an edge_t for this connection */
|
|
|
|
|
|
|
|
c->edge = new_edge();
|
2002-02-18 16:25:19 +00:00
|
|
|
cp
|
2002-02-11 10:05:58 +00:00
|
|
|
c->edge->from.node = myself;
|
2002-03-22 11:43:48 +00:00
|
|
|
// c->edge->from.tcpaddress = str2sockaddr(address, port);
|
|
|
|
c->edge->from.udpaddress = str2sockaddr(myaddress, myport);
|
2002-02-11 10:05:58 +00:00
|
|
|
c->edge->to.node = n;
|
2002-03-22 11:43:48 +00:00
|
|
|
// c->edge->to.tcpaddress = c->address;
|
2002-02-18 16:25:19 +00:00
|
|
|
sockaddr2str(&c->address, &hisaddress, &dummy);
|
|
|
|
c->edge->to.udpaddress = str2sockaddr(hisaddress, hisport);
|
|
|
|
free(hisaddress);
|
|
|
|
free(dummy);
|
2002-02-11 10:05:58 +00:00
|
|
|
c->edge->weight = (weight + c->estimated_weight) / 2;
|
|
|
|
c->edge->connection = c;
|
|
|
|
c->edge->options = c->options;
|
2002-02-18 16:25:19 +00:00
|
|
|
cp
|
2002-02-11 10:05:58 +00:00
|
|
|
edge_add(c->edge);
|
|
|
|
|
|
|
|
/* Activate this connection */
|
|
|
|
|
|
|
|
c->allow_request = ALL;
|
|
|
|
c->status.active = 1;
|
|
|
|
|
|
|
|
if(debug_lvl >= DEBUG_CONNECTIONS)
|
|
|
|
syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), c->name, c->hostname);
|
|
|
|
|
|
|
|
cp
|
|
|
|
/* Send him everything we know */
|
|
|
|
|
|
|
|
send_everything(c);
|
|
|
|
|
|
|
|
/* Notify others of this connection */
|
|
|
|
|
|
|
|
for(node = connection_tree->head; node; node = node->next)
|
|
|
|
{
|
|
|
|
other = (connection_t *)node->data;
|
|
|
|
|
|
|
|
if(other->status.active && other != c)
|
|
|
|
send_add_edge(other, c->edge);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Run MST and SSSP algorithms */
|
|
|
|
|
|
|
|
graph();
|
|
|
|
|
|
|
|
/* Succesful connection, reset timeout if this is an outgoing connection. */
|
|
|
|
|
|
|
|
if(c->outgoing)
|
|
|
|
c->outgoing->timeout = 0;
|
|
|
|
cp
|
|
|
|
return 0;
|
|
|
|
}
|