/*
- protocol.c -- handle the meta-protocol
- Copyright (C) 1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2000 Guus Sliepen <guus@sliepen.warande.net>
+ protocol.c -- handle the meta-protocol, basic functions
+ Copyright (C) 1999-2001 Ivo Timmermans <itimmermans@bigfoot.com>,
+ 2000,2001 Guus Sliepen <guus@sliepen.warande.net>
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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: protocol.c,v 1.28.4.26 2000/09/10 16:15:35 guus Exp $
+ $Id: protocol.c,v 1.28.4.123 2002/02/27 22:37:54 guus Exp $
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
-#include <sys/socket.h>
-#include <unistd.h>
#include <stdio.h>
+#include <stdarg.h>
+#include <errno.h>
#include <utils.h>
-#include <xalloc.h>
-#include <netinet/in.h>
-
-#include "conf.h"
-#include "encr.h"
-#include "net.h"
-#include "netutl.h"
-#include "protocol.h"
-
-#include "system.h"
-
-/* Generic outgoing request routine - takes care of logging and error detection as well */
-
-int send_request(conn_list_t *cl, const char *format, int request, /*args*/ ...)
-{
- va_list args;
- char *buffer = NULL;
-cp
- if(debug_lvl >= DEBUG_PROTOCOL)
- syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), requestname[request], cl->id, cl->hostname);
-
- va_start(args, format);
- len = vasprintf(&buffer, format, args);
- va_end(args);
-
- if(len < 0 || !buffer)
- {
- syslog(LOG_ERR, _("Error during vasprintf(): %m"));
- return -1;
- }
-
- if(debug_lvl >= DEBUG_META)
- syslog(LOG_DEBUG, _("Sending meta data to %s (%s): %s"), cl->id, cl->hostname, buffer);
-
- if(cl->status.encryptout)
- {
- /* FIXME: Do encryption */
- }
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Sending meta data failed: %m"));
- return -1;
- }
-cp
-}
-
-/* Connection protocol:
-
- Client Server
- send_id(*)
- send_challenge
- send_chal_reply(*)
- send_id
- send_challenge
- send_chal_reply
- send_ack
- send_ack
-
- (*) Unencrypted.
-*/
-
-int send_id(conn_list_t *cl)
-{
-cp
- return send_request(cl, "%d %s %d-%d %s", ID, myself->id, myself->min_version, myself->max_version, opt2str(myself->options));
-}
-
-int id_h(conn_list_t *cl)
-{
- conn_list_t *old;
- char *options;
-cp
- if(sscanf(cl->buffer, "%*d %as %d-%d %as", &cl->id, &cl->min_version, &cl->max_version, &options) != 4)
- {
- syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname);
- return -1;
- }
-
- /* Check if version ranges overlap */
-
- if((cl->min_version > myself->max_version) || (cl->max_version < myself_min_version) || (cl->min_version > cl->max_version))
- {
- syslog(LOG_ERR, _("Peer %s uses incompatible version (%d-%d)"), cl->hostname, cl->min_version, cl->max_version);
- return -1;
- }
-
- /* Check if option string is valid */
-
- if(str2opt(options) == -1)
- {
- syslog(LOG_ERR, _("Peer %s uses invalid option string"), cl->hostname);
- return -1;
- }
-
- /* Check if identity is a valid name */
-
- if(!check_id(cl->id))
- {
- syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname);
- return -1;
- }
-
- /* Load information about peer */
-
- if(!read_id(cl))
- {
- syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->id);
- return -1;
- }
-
-
- /* First check if the host we connected to is already in our
- connection list. If so, we are probably making a loop, which
- is not desirable.
- */
-
- if(cl->status.outgoing)
- {
- if((old=lookup_id(cl->id)))
- {
- if(debug_lvl > DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"), cl->id, cl->hostname);
- cl->status.outgoing = 0;
- old->status.outgoing = 1;
- terminate_connection(cl);
- return 0;
- }
- }
-
- /* Since we know the identity now, we can encrypt the meta channel */
-
- cl->status.encryptout = 1;
-
- /* Send a challenge to verify the identity */
-
- cl->allow_request = CHAL_REPLY;
-cp
- return send_challenge(cl);
-}
-
-int send_challenge(conn_list_t *cl)
-{
- char *buffer;
- int keylength;
- int x;
-cp
- if(cl->chal_hash)
- free(cl->chal_hash);
-
- /* Allocate buffers for the challenge and the hash */
-
- cl->chal_hash = xmalloc(SHA_DIGEST_LEN);
- keylength = BN_num_bytes(cl->metakey.n);
- buffer = xmalloc(keylength*2);
-
- /* Copy random data and the public key to the buffer */
-
- RAND_bytes(buffer, keylength);
- BN_bn2bin(cl->metakey.n, buffer+keylength);
-
- /* Calculate the hash from that */
-
- SHA1(buffer, keylength*2, cl->chal_hash);
-
- /* Convert the random data to a hexadecimal formatted string */
-
- bin2hex(buffer,buffer,keylength);
- buffer[keylength*2] = '\0';
-
- /* Send the challenge */
-
- cl->allow_request = CHAL_REPLY;
- x = send_request(cl, "%d %s", CHALLENGE, buffer);
- free(buffer);
-cp
- return x;
-}
-
-int challenge_h(conn_list_t *cl)
-{
- char *challenge;
-cp
- if(sscanf(cl->buffer, "%*d %as", &cl->id, &challenge) != 1)
- {
- syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->id, 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->meyakey.n);
-
- /* Check if the length of the challenge is all right */
-
- if(strlen(challenge) != keylength*2)
- {
- syslog(LOG_ERROR, _("Intruder: wrong challenge length from %s (%s)"), cl->id, cl->hostname);
- return -1;
- }
-
- /* Allocate buffers for the challenge and the hash */
-
- buffer = xmalloc(keylength*2);
- hash = xmalloc(SHA_DIGEST_LEN*2+1);
-
- /* Copy the incoming random data and our public key to the buffer */
-
- hex2bin(challenge, buffer, keylength);
- BN_bn2bin(myself->metakey.n, buffer+keylength);
-
- /* Calculate the hash from that */
-
- SHA1(buffer, keylength*2, hash);
- free(buffer);
-
- /* Convert the hash to a hexadecimal formatted string */
-
- bin2hex(hash,hash,SHA_DIGEST_LEN);
- hash[SHA_DIGEST_LEN*2] = '\0';
-
- /* Send the reply */
-
- if(cl->status.outgoing)
- cl->allow_resuest = 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->id, &hash) != 2)
- {
- syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->id, cl->hostname);
- return -1;
- }
-
- /* Check if the length of the hash is all right */
-
- if(strlen(hash) != SHA_DIGEST_LEN*2)
- {
- syslog(LOG_ERROR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->id, cl->hostname);
- return -1;
- }
-
- /* Convert the hash to binary format */
-
- hex2bin(hash, hash, SHA_DIGEST_LEN);
-
- /* Verify the incoming hash with the calculated hash */
-
- if{!memcmp(hash, cl->chal_hash, SHA_DIGEST_LEN)}
- {
- syslog(LOG_ERROR, _("Intruder: wrong challenge reply from %s (%s)"), cl->id, 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_hash);
-
-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->id)))
- {
- if(debug_lvl > DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
- cl->id, 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->id, 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_meta(cl, "%d %s %d %s", ADD_SUBNET, other->id, subnet->type, 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_meta(cl, "%d %s %d %s", DEL_SUBNET, other->id, subnet->type, net2str(subnet));
-}
-
-int del_subnet_h(conn_list_t *cl)
-{
-}
-
-/* New and closed connections notification */
-
-int send_add_host(conn_list_t *cl, conn_list_t *other)
-{
-cp
- return send_meta(cl, "%d %lx:%d", ADD_HOST, other->id, other->address, other->port);
-}
-
-int add_host_h(conn_list_t *cl)
-{
-}
-
-int send_del_host(conn_list_t *cl, conn_list_t *other)
-{
-cp
- return send_meta(cl, "%d %lx:%d", DEL_HOST, other->id, other->address, other->port);
-}
-
-int del_host_h(conn_list_t *cl)
-{
-}
-
-/* Status and error notification routines */
-
-int send_status(conn_list_t *cl, int statusno, char *statusstring)
-{
-cp
- if(!statusstring)
- statusstring = status_text[statusno];
-cp
- return send_request(cl, "%d %d %s", STATUS, statusno, statusstring);
-}
-
-int status_h(conn_list_t *cl)
-{
- int statusno;
- char *statusstring;
-cp
- if(sscanf(cl->buffer, "%*d %d %as", &statusno, &statusstring) != 2)
- {
- syslog(LOG_ERR, _("Got bad STATUS from %s (%s)"), cl->id, cl->hostname);
- return -1;
- }
-
- if(debug_lvl > DEBUG_STATUS)
- {
- syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"), cl->id, cl->hostname, status_text[statusno], statusstring);
- }
-
-cp
- free(statusstring);
- return 0;
-}
-
-int send_error(conn_list_t *cl, int errno, char *errstring)
-{
-cp
- if(!errorstring)
- errorstring = error_text[errno];
- return send_request(cl, "%d %d %s", ERROR, errno, errstring);
-}
-
-int error_h(conn_list_t *cl)
-{
- int errno;
- char *errorstring;
-cp
- if(sscanf(cl->buffer, "%*d %d %as", &errno, &errorstring) != 2)
- {
- syslog(LOG_ERR, _("Got bad error from %s (%s)"), cl->id, cl->hostname);
- return -1;
- }
-
- if(debug_lvl > DEBUG_error)
- {
- syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"), cl->id, cl->hostname, error_text[errno], errorstring);
- }
-
-cp
- free(errorstring);
- return 0;
-}
-
-int send_termreq(conn_list_t *cl)
-{
-}
-
-int termreq_h(conn_list_t *cl)
-{
-}
-
-/* Keepalive routines */
-
-int send_ping(conn_list_t *cl)
-{
-cp
- return send_meta(cl, "%d", PING);
-}
-
-int ping_h(conn_list_t *cl)
-{
-}
-
-int send_pong(conn_list_t *cl)
-{
-cp
- return send_meta(cl, "%d", PONG);
-}
-
-int pong_h(conn_list_t *cl)
-{
-}
-
-/* Key exchange */
-
-int send_req_key(conn_list_t *cl, conn_list_t *source)
-{
-cp
- return send_meta(cl, "%d %s", REQ_KEY, source->id);
-}
-
-int req_key_h(conn_list_t *cl)
-{
-}
-
-int send_key(conn_list_t *cl)
-{
-}
-
-int key_h(conn_list_t *cl)
-{
-}
-
-
-
-
-/* Old routines */
-
-
-int send_termreq(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending TERMREQ to %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", TERMREQ, myself->vpn_ip);
-
- if(write(cl->meta_socket, buffer, buflen) < 0)
- {
- if(debug_lvl > 1)
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_timeout(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending TIMEOUT to %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", PINGTIMEOUT, myself->vpn_ip);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_del_host(conn_list_t *cl, conn_list_t *new_host)
-{
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending DEL_HOST for %s (%s) to %s (%s)"),
- new_host->vpn_hostname, new_host->real_hostname, cl->vpn_hostname, cl->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", DEL_HOST, new_host->vpn_ip);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_tcppacket(conn_list_t *cl, void *data, int len)
-{
-cp
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("Sending PACKET to %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %d\n", PACKET, len);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-
- if((write(cl->meta_socket, data, len)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_ping(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending PING to %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PING);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_pong(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending PONG to %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PONG);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_add_host(conn_list_t *cl, conn_list_t *new_host)
-{
- ip_t real_ip;
- int flags;
- char *hostname;
-cp
- real_ip = new_host->real_ip;
- hostname = new_host->real_hostname;
- flags = new_host->flags;
-
- /* If we need to propagate information about a new host that wants us to export
- * it's indirectdata flag, we set the INDIRECTDATA flag and unset the EXPORT...
- * flag, and set it's real_ip to our vpn_ip, so that net.c send_packet() will
- * work correctly.
- */
-
- if(flags & EXPORTINDIRECTDATA)
- {
- flags &= ~EXPORTINDIRECTDATA;
- flags |= INDIRECTDATA;
- real_ip = myself->vpn_ip;
- hostname = myself->real_hostname;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending ADD_HOST for %s (%s) to %s (%s)"),
- new_host->vpn_hostname, hostname, cl->vpn_hostname, cl->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx/%lx:%x %d\n", ADD_HOST, real_ip, new_host->vpn_ip, new_host->vpn_mask, new_host->port, flags);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int send_key_changed(conn_list_t *cl, conn_list_t *src)
-{
-cp
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending KEY_CHANGED origin %s to %s (%s)"),
- src->vpn_hostname, cl->vpn_hostname, cl->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", KEY_CHANGED, src->vpn_ip);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-void send_key_changed_all(void)
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p->status.meta && p->status.active)
- send_key_changed(p, myself);
-cp
-}
-
-
-int send_key_request(ip_t to)
-{
- conn_list_t *fw;
-cp
- fw = lookup_conn(to);
- if(!fw)
- {
- syslog(LOG_ERR, _("Attempting to send REQ_KEY to %d.%d.%d.%d, which does not exist?"),
- IP_ADDR_V(to));
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending REQ_KEY to %s (%s)"),
- fw->nexthop->vpn_hostname, fw->nexthop->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx\n", REQ_KEY, to, myself->vpn_ip);
-
- if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
- fw->status.waitingforkey = 1;
-cp
- return 0;
-}
-
-int send_key_answer(conn_list_t *cl, ip_t to)
-{
- conn_list_t *fw;
-cp
-
- fw = lookup_conn(to);
-
- if(!fw)
- {
- syslog(LOG_ERR, _("Attempting to send ANS_KEY to %d.%d.%d.%d, which does not exist?"),
- IP_ADDR_V(to));
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Sending ANS_KEY to %s (%s)"),
- fw->nexthop->vpn_hostname, fw->nexthop->real_hostname);
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx %d %s\n", ANS_KEY, to, myself->vpn_ip, my_key_expiry, my_public_key_base36);
-
- if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
+#include "conf.h"
+#include "protocol.h"
+#include "meta.h"
+#include "connection.h"
-/*
- notify all my direct connections of a new host
- that was added to the vpn, with the exception
- of the source of the announcement.
-*/
-int notify_others(conn_list_t *new, conn_list_t *source,
- int (*function)(conn_list_t*, conn_list_t*))
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p != new && p != source && p->status.meta && p->status.active)
- function(p, new);
-cp
- return 0;
-}
+#include "system.h"
-/*
- notify one connection of everything
- i have connected
-*/
-int notify_one(conn_list_t *new)
+int check_id(char *id)
{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p != new && p->status.active)
- send_add_host(new, p);
-cp
- return 0;
-}
-
-/*
- The incoming request handlers
-*/
-
+ int i;
-int termreq_h(conn_list_t *cl)
-{
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized TERMREQ from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
+ for (i = 0; i < strlen(id); i++)
+ if(!isalnum(id[i]) && id[i] != '_')
return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got TERMREQ from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- cl->status.termreq = 1;
-
- terminate_connection(cl);
-cp
- return 0;
-}
-
-int timeout_h(conn_list_t *cl)
-{
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized TIMEOUT from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got TIMEOUT from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- cl->status.termreq = 1;
- terminate_connection(cl);
-cp
return 0;
}
-int del_host_h(conn_list_t *cl)
-{
- ip_t vpn_ip;
- conn_list_t *fw;
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized DEL_HOST from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(sscanf(cl->buffer, "%*d %lx", &vpn_ip) != 1)
- {
- syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(!(fw = lookup_conn(vpn_ip)))
- {
- syslog(LOG_ERR, _("Got DEL_HOST for %d.%d.%d.%d from %s (%s) which does not exist?"),
- IP_ADDR_V(vpn_ip), cl->vpn_hostname, cl->real_hostname);
- return 0;
- }
-
- /* Connections lists are really messed up if this happens */
- if(vpn_ip == myself->vpn_ip)
- {
- syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"),
- cl->vpn_hostname, cl->real_hostname);
- sighup = 1;
- return 0;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got DEL_HOST for %s (%s) from %s (%s)"),
- fw->vpn_hostname, fw->real_hostname, cl->vpn_hostname, cl->real_hostname);
-
- notify_others(fw, cl, send_del_host);
-
- fw->status.termreq = 1;
- fw->status.active = 0;
-
- terminate_connection(fw);
-cp
- return 0;
-}
+/* Generic request routines - takes care of logging and error
+ detection as well */
-int tcppacket_h(conn_list_t *cl)
+int send_request(connection_t *c, const char *format, ...)
{
- int len;
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized PACKET from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(sscanf(cl->buffer, "%*d %d", &len) != 1)
- {
- syslog(LOG_ERR, _("Got bad PACKET from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(len > MTU)
- {
- syslog(LOG_ERR, _("Got too big PACKET from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("Got PACKET length %d from %s (%s)"), len,
- cl->vpn_hostname, cl->real_hostname);
+ va_list args;
+ char buffer[MAXBUFSIZE];
+ int len, request;
- cl->tcppacket=len;
cp
- return 0;
-}
+ /* Use vsnprintf instead of vasprintf: faster, no memory
+ fragmentation, cleanup is automatic, and there is a limit on the
+ input buffer anyway */
+ va_start(args, format);
+ len = vsnprintf(buffer, MAXBUFSIZE, format, args);
+ va_end(args);
-int ping_h(conn_list_t *cl)
-{
-cp
- if(!cl->status.active)
+ if(len < 0 || len > MAXBUFSIZE-1)
{
- syslog(LOG_ERR, _("Got unauthorized PING from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
+ syslog(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"), request_name[request], c->name, c->hostname);
return -1;
}
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PING from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- cl->status.pinged = 0;
- cl->status.got_pong = 1;
-
- send_pong(cl);
-cp
- return 0;
-}
-
-int pong_h(conn_list_t *cl)
-{
-cp
- if(!cl->status.active)
+ if(debug_lvl >= DEBUG_PROTOCOL)
{
- syslog(LOG_ERR, _("Got unauthorized PONG from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
+ sscanf(buffer, "%d", &request);
+ if(debug_lvl >= DEBUG_META)
+ syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], c->name, c->hostname, buffer);
+ else
+ syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], c->name, c->hostname);
}
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got PONG from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
-
- cl->status.got_pong = 1;
+ buffer[len++] = '\n';
cp
- return 0;
+ return send_meta(c, buffer, len);
}
-int add_host_h(conn_list_t *cl)
+int receive_request(connection_t *c)
{
- ip_t real_ip;
- ip_t vpn_ip;
- ip_t vpn_mask;
- unsigned short port;
- int flags;
- conn_list_t *ncn, *old;
+ int request;
cp
- if(!cl->status.active)
+ if(sscanf(c->buffer, "%d", &request) == 1)
{
- syslog(LOG_ERR, _("Got unauthorized ADD_HOST from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(sscanf(cl->buffer, "%*d %lx %lx/%lx:%hx %d", &real_ip, &vpn_ip, &vpn_mask, &port, &flags) != 5)
- {
- syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if((old = lookup_conn(vpn_ip)))
- {
- if((real_ip==old->real_ip) && (vpn_mask==old->vpn_mask) && (port==old->port))
+ if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL))
{
- if(debug_lvl>1)
- syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"),
- old->vpn_hostname, old->real_hostname, cl->vpn_hostname, cl->real_hostname);
- goto skip_add_host; /* One goto a day keeps the deeply nested if constructions away. */
+ if(debug_lvl >= DEBUG_META)
+ syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
+ c->name, c->hostname, c->buffer);
+ else
+ syslog(LOG_ERR, _("Unknown request from %s (%s)"),
+ c->name, c->hostname);
+
+ return -1;
}
else
{
- if(debug_lvl>1)
- syslog(LOG_NOTICE, _("Removing old entry for %s (%s)"),
- old->vpn_hostname, old->real_hostname);
- old->status.active = 0;
- terminate_connection(old);
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ {
+ if(debug_lvl >= DEBUG_META)
+ syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"),
+ request_name[request], c->name, c->hostname, c->buffer);
+ else
+ syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
+ request_name[request], c->name, c->hostname);
+ }
+ }
+
+ if((c->allow_request != ALL) && (c->allow_request != request))
+ {
+ syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname);
+ return -1;
}
- }
-
- /* Connections lists are really messed up if this happens */
- if(vpn_ip == myself->vpn_ip)
- {
- syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"),
- cl->vpn_hostname, cl->real_hostname);
- sighup = 1;
- return 0;
- }
-
- ncn = new_conn_list();
- ncn->real_ip = real_ip;
- ncn->real_hostname = hostlookup(htonl(real_ip));
- ncn->vpn_ip = vpn_ip;
- ncn->vpn_mask = vpn_mask;
- ncn->vpn_hostname = hostlookup(htonl(vpn_ip));
- ncn->port = port;
- ncn->flags = flags;
- ncn->nexthop = cl;
- ncn->next = conn_list;
- conn_list = ncn;
- ncn->status.active = 1;
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got ADD_HOST for %s (%s) from %s (%s)"),
- ncn->vpn_hostname, ncn->real_hostname, cl->vpn_hostname, cl->real_hostname);
-
- notify_others(ncn, cl, send_add_host);
-
-skip_add_host:
-cp
- return 0;
-}
-
-int req_key_h(conn_list_t *cl)
-{
- ip_t to;
- ip_t from;
- conn_list_t *fw;
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized REQ_KEY from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(sscanf(cl->buffer, "%*d %lx %lx", &to, &from) != 2)
- {
- syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got REQ_KEY origin %d.%d.%d.%d destination %d.%d.%d.%d from %s (%s)"),
- IP_ADDR_V(from), IP_ADDR_V(to), cl->vpn_hostname, cl->real_hostname);
-
- if((to & myself->vpn_mask) == (myself->vpn_ip & myself->vpn_mask))
- { /* hey! they want something from ME! :) */
- send_key_answer(cl, from);
- return 0;
- }
-
- fw = lookup_conn(to);
-
- if(!fw)
- {
- syslog(LOG_ERR, _("Attempting to forward REQ_KEY to %d.%d.%d.%d, which does not exist?"),
- IP_ADDR_V(to));
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Forwarding REQ_KEY to %s (%s)"),
- fw->nexthop->vpn_hostname, fw->nexthop->real_hostname);
-
- cl->buffer[cl->reqlen-1] = '\n';
-
- if(write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-void set_keys(conn_list_t *cl, int expiry, char *key)
-{
- char *ek;
-cp
- if(!cl->public_key)
- {
- cl->public_key = xmalloc(sizeof(*cl->key));
- cl->public_key->key = NULL;
- }
-
- if(cl->public_key->key)
- free(cl->public_key->key);
- cl->public_key->length = strlen(key);
- cl->public_key->expiry = expiry;
- cl->public_key->key = xmalloc(cl->public_key->length + 1);
- strcpy(cl->public_key->key, key);
-
- ek = make_shared_key(key);
-
- if(!cl->key)
- {
- cl->key = xmalloc(sizeof(*cl->key));
- cl->key->key = NULL;
- }
-
- if(cl->key->key)
- free(cl->key->key);
-
- cl->key->length = strlen(ek);
- cl->key->expiry = expiry;
- cl->key->key = xmalloc(cl->key->length + 1);
- strcpy(cl->key->key, ek);
-cp
-}
-
-int ans_key_h(conn_list_t *cl)
-{
- ip_t to;
- ip_t from;
- int expiry;
- char *key;
- conn_list_t *fw, *gk;
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized ANS_KEY from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- if(sscanf(cl->buffer, "%*d %lx %lx %d %as", &to, &from, &expiry, &key) != 4)
- {
- syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got ANS_KEY origin %d.%d.%d.%d destination %d.%d.%d.%d from %s (%s)"),
- IP_ADDR_V(from), IP_ADDR_V(to), cl->vpn_hostname, cl->real_hostname);
-
- if(to == myself->vpn_ip)
- { /* hey! that key's for ME! :) */
- gk = lookup_conn(from);
-
- if(!gk)
+ if(request_handlers[request](c))
+ /* Something went wrong. Probably scriptkiddies. Terminate. */
{
- syslog(LOG_ERR, _("Receiving ANS_KEY origin %d.%d.%d.%d from %s (%s), which does not exist?"),
- IP_ADDR_V(from), cl->vpn_hostname, cl->real_hostname);
+ syslog(LOG_ERR, _("Error while processing %s from %s (%s)"),
+ request_name[request], c->name, c->hostname);
return -1;
}
-
- set_keys(gk, expiry, key);
- gk->status.validkey = 1;
- gk->status.waitingforkey = 0;
- flush_queues(gk);
- return 0;
- }
-
- fw = lookup_conn(to);
-
- if(!fw)
- {
- syslog(LOG_ERR, _("Attempting to forward ANS_KEY to %d.%d.%d.%d, which does not exist?"),
- IP_ADDR_V(to));
- return -1;
- }
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Forwarding ANS_KEY to %s (%s)"),
- fw->nexthop->vpn_hostname, fw->nexthop->real_hostname);
-
- cl->buffer[cl->reqlen-1] = '\n';
-
- if((write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen)) < 0)
- {
- syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
-cp
- return 0;
-}
-
-int key_changed_h(conn_list_t *cl)
-{
- ip_t from;
- conn_list_t *ik;
-cp
- if(!cl->status.active)
- {
- syslog(LOG_ERR, _("Got unauthorized KEY_CHANGED from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
}
-
- if(sscanf(cl->buffer, "%*d %lx", &from) != 1)
- {
- syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
- }
-
- ik = lookup_conn(from);
-
- if(!ik)
+ else
{
- syslog(LOG_ERR, _("Got KEY_CHANGED origin %d.%d.%d.%d from %s (%s), which does not exist?"),
- IP_ADDR_V(from), cl->vpn_hostname, cl->real_hostname);
+ syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
+ c->name, c->hostname);
return -1;
}
-
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Got KEY_CHANGED origin %s from %s (%s)"),
- ik->vpn_hostname, cl->vpn_hostname, cl->real_hostname);
-
- ik->status.validkey = 0;
- ik->status.waitingforkey = 0;
-
- notify_others(ik, cl, send_key_changed);
cp
return 0;
}
-/* "Complete overhaul". */
+/* Jumptable for the request handlers */
-int (*request_handlers[])(conn_list_t*) = {
- id_h, challenge_h, chal_reply_h, ack_h,
+int (*request_handlers[])(connection_t*) = {
+ id_h, metakey_h, challenge_h, chal_reply_h, ack_h,
status_h, error_h, termreq_h,
- add_host_h, del_host_h,
ping_h, pong_h,
+// add_node_h, del_node_h,
+ add_subnet_h, del_subnet_h,
+ add_edge_h, del_edge_h,
+ key_changed_h, req_key_h, ans_key_h,
+ tcppacket_h,
};
+/* Request names */
+
char (*request_name[]) = {
- "ID", "CHALLENGE", "CHAL_REPLY", "ACK",
+ "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
"STATUS", "ERROR", "TERMREQ",
- "ADD_HOST", "DEL_HOST",
"PING", "PONG",
+// "ADD_NODE", "DEL_NODE",
+ "ADD_SUBNET", "DEL_SUBNET",
+ "ADD_EDGE", "DEL_EDGE",
+ "KEY_CHANGED", "REQ_KEY", "ANS_KEY",
+ "PACKET",
};
projects / tinc / blobdiff