-int challenge_h(conn_list_t *cl)
-{
- char *challenge;
- int x;
-
-cp
- if(sscanf(cl->buffer, "%*d %as", &cl->name, &challenge) != 1)
- {
- syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Rest is done by send_chal_reply() */
-
- x = send_chal_reply(cl, challenge);
- free(challenge);
-cp
- return x;
-}
-
-int send_chal_reply(conn_list_t *cl, char *challenge)
-{
- char *buffer;
- int keylength;
- char *hash;
- int x;
-
-cp
- keylength = BN_num_bytes(myself->rsakey->length);
-
- /* Check if the length of the challenge is all right */
-
- if(strlen(challenge) != keylength*2)
- {
- syslog(LOG_ERR, _("Intruder: wrong challenge length from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Allocate buffers for the challenge and the hash */
-
- buffer = xmalloc(keylength*2);
- hash = xmalloc(SHA_DIGEST_LENGTH*2+1);
-
- /* Copy the incoming random data and our public key to the buffer */
-
- hex2bin(challenge, buffer, keylength);
- BN_bn2bin(myself->rsakey->length, buffer+keylength);
-
- /* Calculate the hash from that */
-
- SHA1(buffer, keylength*2, hash);
-
- /* If we don't have a blowfish key set yet, use the random data from the challenge to do so. */
-
- if(!cl->status.encrypted)
- {
- set_metakey(cl, buffer, keylength);
- cl->status.encrypted = 1;
- }
-
- free(buffer);
-
- /* Convert the hash to a hexadecimal formatted string */
-
- bin2hex(hash,hash,SHA_DIGEST_LENGTH);
- hash[SHA_DIGEST_LENGTH*2] = '\0';
-
- /* Send the reply */
-
- if(cl->status.outgoing)
- cl->allow_request = ID;
- else
- cl->allow_request = ACK;
-
- x = send_request(cl, "%d %s", CHAL_REPLY, hash);
- free(hash);
-cp
- return x;
-}
-
-int chal_reply_h(conn_list_t *cl)
-{
- char *hash;
-cp
- if(sscanf(cl->buffer, "%*d %as", &cl->name, &hash) != 2)
- {
- syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Check if the length of the hash is all right */
-
- if(strlen(hash) != SHA_DIGEST_LENGTH*2)
- {
- syslog(LOG_ERR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Convert the hash to binary format */
-
- hex2bin(hash, hash, SHA_DIGEST_LENGTH);
-
- /* Verify the incoming hash with the calculated hash */
-
- if(!memcmp(hash, cl->chal_answer, SHA_DIGEST_LENGTH))
- {
- syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Identity has now been positively verified.
- If we are accepting this new connection, then send our identity,
- if we are making this connecting, acknowledge.
- */
-
- free(hash);
- free(cl->chal_answer);
-
-cp
- if(cl->status.outgoing)
- {
- cl->allow_request = ACK;
- return send_ack(cl);
- }
- else
- {
- cl->allow_request = CHALLENGE;
- return send_id(cl);
- }
-}
-
-int send_ack(conn_list_t *cl)
-{
-cp
- return send_request(cl, "%d", ACK);
-}
-
-int ack_h(conn_list_t *cl)
-{
- conn_list_t *old;
-
-cp
- /* Okay, before we active the connection, we check if there is another entry
- in the connection list with the same vpn_ip. If so, it presumably is an
- old connection that has timed out but we don't know it yet.
- */
-
- while((old = lookup_id(cl->name)))
- {
- if(debug_lvl > DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
- cl->name, old->hostname, cl->hostname);
- old->status.active = 0;
- terminate_connection(old);
- }
-
- /* Activate this connection */
-
- cl->allow_request = ALL;
- cl->status.active = 1;
-
- if(debug_lvl > DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
-
- /* Exchange information about other tinc daemons */
-
- notify_others(cl, NULL, send_add_host);
- notify_one(cl);
-
- upstreamindex = 0;
-
-cp
- if(cl->status.outgoing)
- return 0;
- else
- return send_ack(cl);
-}
-
-/* Address and subnet information exchange */
-
-int send_add_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
-{
-cp
-/* return send_request(cl, "%d %s %d %s", ADD_SUBNET,
- other->name, subnet->type, net2str(subnet)); */
- return send_request(cl, "%d %s %s", ADD_SUBNET,
- other->name, net2str(subnet));
-}
-
-int add_subnet_h(conn_list_t *cl)
-{
-}
-
-int send_del_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
-{
-cp
- return send_request(cl, "%d %s %s", DEL_SUBNET, other->name, net2str(subnet));
-}
-
-int del_subnet_h(conn_list_t *cl)
-{
-}
-
-/* New and closed connections notification */