X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=f36538e382899ca4f4d3a27ff4267899fb64f185;hp=2e9769d24cedc843286224322dd26a1906f1f5af;hb=2a3e343c7228d5f07176e4b404d895c7adc5bdf9;hpb=070ad08118a33755835b31174e2b04e84f75556e

diff --git a/src/protocol.c b/src/protocol.c
index 2e9769d2..f36538e3 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -1,7 +1,7 @@
 /*
-    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) 1999-2005 Ivo Timmermans,
+                  2000-2012 Guus Sliepen <guus@tinc-vpn.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
@@ -13,897 +13,228 @@
     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.c,v 1.28.4.12 2000/06/27 20:55:12 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 "config.h"
-
-#include <sys/types.h>
-
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <sys/socket.h>
-#include <unistd.h>
-#include <stdio.h>
-
-#include <utils.h>
-#include <xalloc.h>
+#include "system.h"
 
 #include "conf.h"
-#include "encr.h"
-#include "net.h"
-#include "netutl.h"
+#include "connection.h"
+#include "logger.h"
+#include "meta.h"
 #include "protocol.h"
+#include "utils.h"
+#include "xalloc.h"
 
-#include "system.h"
-
-char buffer[MAXBUFSIZE+1];
-int buflen;
-
-/* Outgoing request routines */
-
-int send_ack(conn_list_t *cl)
-{
-cp
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Sending ACK to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", ACK);
+bool tunnelserver = false;
+bool strictsubnets = false;
 
-  if((write(cl->meta_socket, buffer, buflen)) < 0)
-    {
-      syslog(LOG_ERR, _("Send failed: %d:%d: %m"), __FILE__, __LINE__);
-      return -1;
-    }
-
-  if(debug_lvl > 0)
-    syslog(LOG_NOTICE, _("Connection with " IP_ADDR_S " (%s) activated"),
-                       IP_ADDR_V(cl->vpn_ip), cl->hostname);
-cp
-  return 0;
-}
-
-int send_termreq(conn_list_t *cl)
-{
-cp
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Sending TERMREQ to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(cl->vpn_ip), cl->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 " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(cl->vpn_ip), cl->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 " IP_ADDR_S " to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(new_host->vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->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_ping(conn_list_t *cl)
-{
-cp
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Sending PING to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(cl->vpn_ip), cl->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 " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(cl->vpn_ip), cl->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->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->hostname;
-    }
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Sending ADD_HOST for " IP_ADDR_S " (%s) to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(new_host->vpn_ip), hostname, IP_ADDR_V(cl->vpn_ip), cl->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 " IP_ADDR_S " to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(src->vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->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_basic_info(conn_list_t *cl)
-{
-cp
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Sending BASIC_INFO to %s"),
-	   cl->hostname);
-
-  buflen = snprintf(buffer, MAXBUFSIZE, "%d %d %lx/%lx:%x %d\n", BASIC_INFO, PROT_CURRENT, myself->vpn_ip, myself->vpn_mask, myself->port, myself->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_passphrase(conn_list_t *cl)
-{
-  passphrase_t tmp;
-cp
-  encrypt_passphrase(&tmp);
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Sending PASSPHRASE to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PASSPHRASE, tmp.phrase);
-
-  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_public_key(conn_list_t *cl)
-{
-cp
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Sending PUBLIC_KEY to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PUBLIC_KEY, my_public_key_base36);
-
-  if((write(cl->meta_socket, buffer, buflen)) < 0)
-    {
-      syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
-      return -1;
-    }
-cp
-  return 0;
-}
-
-/* WDN doet deze functie? (GS)
-int send_calculate(conn_list_t *cl, char *k)
-{
-cp
-  buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", CALCULATE, k);
-
-  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_request(ip_t to)
-{
-  conn_list_t *fw;
-cp
-  fw = lookup_conn(to);
-  if(!fw)
-    {
-      syslog(LOG_ERR, _("Attempting to send REQ_KEY to " IP_ADDR_S ", which does not exist?"),
-	     IP_ADDR_V(to));
-      return -1;
-    }
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Sending REQ_KEY to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(fw->nexthop->vpn_ip), fw->nexthop->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;
-}
+/* Jumptable for the request handlers */
 
-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 " IP_ADDR_S ", which does not exist?"),
-	     IP_ADDR_V(to));
-      return -1;
-    }
-
- if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Sending ANS_KEY to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(fw->nexthop->vpn_ip), fw->nexthop->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;
-}
-
-/*
-  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;
-}
-
-/*
-  notify one connection of everything
-  i have connected
-*/
-int notify_one(conn_list_t *new)
-{
-  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 basic_info_h(conn_list_t *cl)
-{
-cp
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got BASIC_INFO from %s"), cl->hostname);
-
-  if(sscanf(cl->buffer, "%*d %d %lx/%lx:%hx %d", &cl->protocol_version, &cl->vpn_ip, &cl->vpn_mask, &cl->port, &cl->flags) != 5)
-    {
-       syslog(LOG_ERR, _("Got bad BASIC_INFO from %s"),
-              cl->hostname);
-       return -1;
-    }  
-
-  if(cl->protocol_version != PROT_CURRENT)
-    {
-      syslog(LOG_ERR, _("Peer uses incompatible protocol version %d"),
-	     cl->protocol_version);
-      return -1;
-    }
-
-  if(cl->status.outgoing)
-    {
-      if(setup_vpn_connection(cl) < 0)
-	return -1;
-      send_basic_info(cl);
-    }
-  else
-    {
-      if(setup_vpn_connection(cl) < 0)
-	return -1;
-      send_passphrase(cl);
-    }
-cp
-  return 0;
-}
-
-int passphrase_h(conn_list_t *cl)
-{
-cp
-  cl->pp = xmalloc(sizeof(*(cl->pp)));
-
-  if(sscanf(cl->buffer, "%*d %as", &(cl->pp->phrase)) != 1)
-    {
-      syslog(LOG_ERR, _("Got bad PASSPHRASE from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-      return -1;
-    }
-  cl->pp->len = strlen(cl->pp->phrase);
-    
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got PASSPHRASE from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  if(cl->status.outgoing)
-    send_passphrase(cl);
-  else
-    send_public_key(cl);
-cp
-  return 0;
-}
-
-int public_key_h(conn_list_t *cl)
-{
-  char *g_n;
-  conn_list_t *old;
-cp
-  if(sscanf(cl->buffer, "%*d %as", &g_n) != 1)
-    {
-       syslog(LOG_ERR, _("Got bad PUBLIC_KEY from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-       return -1;
-    }  
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got PUBLIC_KEY from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  if(verify_passphrase(cl, g_n))
-    {
-      /* intruder! */
-      syslog(LOG_ERR, _("Intruder: passphrase does not match!"));
-      return -1;
-    }
-
-  if(cl->status.outgoing)
-    send_public_key(cl);
-  else
-    {
-      send_ack(cl);
-
-      /* 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. Because our
-         conn_list entry is not active, lookup_conn will skip ourself. */
-
-      while(old = lookup_conn(cl->vpn_ip)) 
-        terminate_connection(old);
-
-      cl->status.active = 1;
-      notify_others(cl, NULL, send_add_host);
-      notify_one(cl);
-    }
-cp
-  return 0;
-}
-
-int ack_h(conn_list_t *cl)
-{
-cp
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got ACK from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-  
-  cl->status.active = 1;
-  syslog(LOG_NOTICE, _("Connection with " IP_ADDR_S " (%s) activated"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-  upstreamindex = 0;
-cp
-  return 0;
-}
-
-int termreq_h(conn_list_t *cl)
-{
-cp
-  if(!cl->status.active)
-    {
-      syslog(LOG_ERR, _("Got unauthorized TERMREQ from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-      return -1;
-    }
-    
-  if(debug_lvl > 1)
-   syslog(LOG_DEBUG, _("Got TERMREQ from " IP_ADDR_S " (%s)"),
-             IP_ADDR_V(cl->vpn_ip), cl->hostname);
-  
-  cl->status.termreq = 1;
-
-  if(cl->status.active)
-    notify_others(cl, NULL, send_del_host);
-
-  cl->status.active = 0;
-
-  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 " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-      return -1;
-    }
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got TIMEOUT from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->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 " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-      return -1;
-    }
-
-  if(sscanf(cl->buffer, "%*d %lx", &vpn_ip) != 1)
-    {
-       syslog(LOG_ERR, _("Got bad DEL_HOST from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-       return -1;
-    }  
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got DEL_HOST for " IP_ADDR_S " from " IP_ADDR_S " (%s)"),
-           IP_ADDR_V(vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  if(!(fw = lookup_conn(vpn_ip)))
-    {
-      syslog(LOG_ERR, _("Got DEL_HOST for " IP_ADDR_S " from " IP_ADDR_S " (%s) which does not exist?"),
-	     IP_ADDR_V(vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->hostname);
-      return 0;
-    }
-
-  notify_others(fw, cl, send_del_host);
-
-  fw->status.termreq = 1;
-  fw->status.active = 0;
-
-  terminate_connection(fw);
-cp
-  return 0;
-}
-
-int ping_h(conn_list_t *cl)
-{
-cp
-  if(!cl->status.active)
-    {
-      syslog(LOG_ERR, _("Got unauthorized PING from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-      return -1;
-    }
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got PING from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->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)
-    {
-      syslog(LOG_ERR, _("Got unauthorized PONG from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-      return -1;
-    }
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got PONG from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  cl->status.got_pong = 1;
-cp
-  return 0;
-}
-
-int add_host_h(conn_list_t *cl)
-{
-  ip_t real_ip;
-  ip_t vpn_ip;
-  ip_t vpn_mask;
-  unsigned short port;
-  int flags;
-  conn_list_t *ncn, *old;
-cp
-  if(!cl->status.active)
-    {
-      syslog(LOG_ERR, _("Got unauthorized ADD_HOST from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->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 " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-       return -1;
-    }  
-
-  while(old = lookup_conn(vpn_ip))
-      terminate_connection(old);
-    
-  ncn = new_conn_list();
-  ncn->real_ip = real_ip;
-  ncn->hostname = hostlookup(htonl(real_ip));
-  ncn->vpn_ip = vpn_ip;
-  ncn->vpn_mask = vpn_mask;
-  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 " IP_ADDR_S " (%s) from " IP_ADDR_S " (%s)"),
-           IP_ADDR_V(ncn->vpn_ip), ncn->hostname, IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  notify_others(ncn, cl, send_add_host);
-cp
-  return 0;
-}
+static bool (*request_handlers[])(connection_t *) = {
+		id_h, metakey_h, challenge_h, chal_reply_h, ack_h,
+		status_h, error_h, termreq_h,
+		ping_h, pong_h,
+		add_subnet_h, del_subnet_h,
+		add_edge_h, del_edge_h,
+		key_changed_h, req_key_h, ans_key_h, tcppacket_h,
+};
 
-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 " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-      return -1;
-    }
-
-  if(sscanf(cl->buffer, "%*d %lx %lx", &to, &from) != 2)
-    {
-       syslog(LOG_ERR, _("Got bad REQ_KEY from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-       return -1;
-    }  
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got REQ_KEY origin " IP_ADDR_S " destination " IP_ADDR_S " from " IP_ADDR_S " (%s)"),
-           IP_ADDR_V(from), IP_ADDR_V(to), IP_ADDR_V(cl->vpn_ip), cl->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 " IP_ADDR_S ", which does not exist?"),
-	     IP_ADDR_V(to));
-      return -1;
-    }
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Forwarding REQ_KEY to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(fw->nexthop->vpn_ip), fw->nexthop->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;
-}
+/* Request names */
 
-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
-}
+static char (*request_name[]) = {
+		"ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
+		"STATUS", "ERROR", "TERMREQ",
+		"PING", "PONG",
+		"ADD_SUBNET", "DEL_SUBNET",
+		"ADD_EDGE", "DEL_EDGE", "KEY_CHANGED", "REQ_KEY", "ANS_KEY", "PACKET",
+};
 
-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 " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->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 " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-       return -1;
-    }  
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got ANS_KEY origin " IP_ADDR_S " destination " IP_ADDR_S " from " IP_ADDR_S " (%s)"),
-            IP_ADDR_V(from), IP_ADDR_V(to), IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  if(to == myself->vpn_ip)
-    {  /* hey! that key's for ME! :) */
-      gk = lookup_conn(from);
-
-      if(!gk)
-        {
-          syslog(LOG_ERR, _("Receiving ANS_KEY from " IP_ADDR_S ", which does not exist?"),
-	         IP_ADDR_V(from));
-          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 " IP_ADDR_S ", which does not exist?"),
-	     IP_ADDR_V(to));
-      return -1;
-    }
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Forwarding ANS_KEY to " IP_ADDR_S " (%s)"),
-	   IP_ADDR_V(fw->nexthop->vpn_ip), fw->nexthop->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;
+static avl_tree_t *past_request_tree;
+
+bool check_id(const char *id) {
+	for(; *id; id++)
+		if(!isalnum(*id) && *id != '_')
+			return false;
+
+	return true;
+}
+
+/* Generic request routines - takes care of logging and error
+   detection as well */
+
+bool send_request(connection_t *c, const char *format, ...) {
+	va_list args;
+	char buffer[MAXBUFSIZE];
+	int len, request = 0;
+
+	/* Use vsnprintf instead of vxasprintf: 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);
+
+	if(len < 0 || len > MAXBUFSIZE - 1) {
+		logger(LOG_ERR, "Output buffer overflow while sending request to %s (%s)",
+			   c->name, c->hostname);
+		return false;
+	}
+
+	ifdebug(PROTOCOL) {
+		sscanf(buffer, "%d", &request);
+		ifdebug(META)
+			logger(LOG_DEBUG, "Sending %s to %s (%s): %s",
+				   request_name[request], c->name, c->hostname, buffer);
+		else
+			logger(LOG_DEBUG, "Sending %s to %s (%s)", request_name[request],
+				   c->name, c->hostname);
+	}
+
+	buffer[len++] = '\n';
+
+	if(c == everyone) {
+		broadcast_meta(NULL, buffer, len);
+		return true;
+	} else
+		return send_meta(c, buffer, len);
 }
 
-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 " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-      return -1;
-    }
-
-  if(sscanf(cl->buffer, "%*d %lx", &from) != 1)
-    {
-       syslog(LOG_ERR, _("Got bad KEY_CHANGED from " IP_ADDR_S " (%s)"),
-              IP_ADDR_V(cl->vpn_ip), cl->hostname);
-       return -1;
-    }  
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, _("Got KEY_CHANGED origin " IP_ADDR_S " from " IP_ADDR_S " (%s)"),
-            IP_ADDR_V(from), IP_ADDR_V(cl->vpn_ip), cl->hostname);
-
-  ik = lookup_conn(from);
-
-  if(!ik)
-    {
-      syslog(LOG_ERR, _("Got KEY_CHANGED from " IP_ADDR_S ", which does not exist?"),
-	     IP_ADDR_V(from));
-      return -1;
-    }
-
-  ik->status.validkey = 0;
-  ik->status.waitingforkey = 0;
-
-  notify_others(ik, cl, send_key_changed);
-cp
-  return 0;
+void forward_request(connection_t *from) {
+	int request;
+
+	ifdebug(PROTOCOL) {
+		sscanf(from->buffer, "%d", &request);
+		ifdebug(META)
+			logger(LOG_DEBUG, "Forwarding %s from %s (%s): %s",
+				   request_name[request], from->name, from->hostname,
+				   from->buffer);
+		else
+			logger(LOG_DEBUG, "Forwarding %s from %s (%s)",
+				   request_name[request], from->name, from->hostname);
+	}
+
+	from->buffer[from->reqlen - 1] = '\n';
+
+	broadcast_meta(from, from->buffer, from->reqlen);
+}
+
+bool receive_request(connection_t *c) {
+	int request;
+
+	if(proxytype == PROXY_HTTP && c->allow_request == ID) {
+		if(!c->buffer[0] || c->buffer[0] == '\r')
+			return true;
+		if(!strncasecmp(c->buffer, "HTTP/1.1 ", 9)) {
+			if(!strncmp(c->buffer + 9, "200", 3)) {
+				logger(LOG_DEBUG, "Proxy request granted");
+				return true;
+			} else {
+				logger(LOG_DEBUG, "Proxy request rejected: %s", c->buffer + 9);
+				return false;
+			}
+		}
+	}
+
+	if(sscanf(c->buffer, "%d", &request) == 1) {
+		if((request < 0) || (request >= LAST) || !request_handlers[request]) {
+			ifdebug(META)
+				logger(LOG_DEBUG, "Unknown request from %s (%s): %s",
+					   c->name, c->hostname, c->buffer);
+			else
+				logger(LOG_ERR, "Unknown request from %s (%s)",
+					   c->name, c->hostname);
+
+			return false;
+		} else {
+			ifdebug(PROTOCOL) {
+				ifdebug(META)
+					logger(LOG_DEBUG, "Got %s from %s (%s): %s",
+						   request_name[request], c->name, c->hostname,
+						   c->buffer);
+				else
+					logger(LOG_DEBUG, "Got %s from %s (%s)",
+						   request_name[request], c->name, c->hostname);
+			}
+		}
+
+		if((c->allow_request != ALL) && (c->allow_request != request)) {
+			logger(LOG_ERR, "Unauthorized request from %s (%s)", c->name,
+				   c->hostname);
+			return false;
+		}
+
+		if(!request_handlers[request](c)) {
+			/* Something went wrong. Probably scriptkiddies. Terminate. */
+
+			logger(LOG_ERR, "Error while processing %s from %s (%s)",
+				   request_name[request], c->name, c->hostname);
+			return false;
+		}
+	} else {
+		logger(LOG_ERR, "Bogus data received from %s (%s)",
+			   c->name, c->hostname);
+		return false;
+	}
+
+	return true;
+}
+
+static int past_request_compare(const past_request_t *a, const past_request_t *b) {
+	return strcmp(a->request, b->request);
+}
+
+static void free_past_request(past_request_t *r) {
+	if(r->request)
+		free(r->request);
+
+	free(r);
+}
+
+void init_requests(void) {
+	past_request_tree = avl_alloc_tree((avl_compare_t) past_request_compare, (avl_action_t) free_past_request);
+}
+
+void exit_requests(void) {
+	avl_delete_tree(past_request_tree);
+}
+
+bool seen_request(char *request) {
+	past_request_t *new, p = {NULL};
+
+	p.request = request;
+
+	if(avl_search(past_request_tree, &p)) {
+		ifdebug(SCARY_THINGS) logger(LOG_DEBUG, "Already seen request");
+		return true;
+	} else {
+		new = xmalloc(sizeof(*new));
+		new->request = xstrdup(request);
+		new->firstseen = now;
+		avl_insert(past_request_tree, new);
+		return false;
+	}
+}
+
+void age_past_requests(void) {
+	avl_node_t *node, *next;
+	past_request_t *p;
+	int left = 0, deleted = 0;
+
+	for(node = past_request_tree->head; node; node = next) {
+		next = node->next;
+		p = node->data;
+
+		if(p->firstseen + pinginterval <= now)
+			avl_delete_node(past_request_tree, node), deleted++;
+		else
+			left++;
+	}
+
+	if(left || deleted)
+		ifdebug(SCARY_THINGS) logger(LOG_DEBUG, "Aging past requests: deleted %d, left %d",
+			   deleted, left);
 }
-
-int (*request_handlers[256])(conn_list_t*) = {
-  0, ack_h, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  termreq_h, timeout_h, del_host_h, 0, 0, 0, 0, 0, 0, 0,
-  ping_h, pong_h, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  add_host_h, basic_info_h, passphrase_h, public_key_h, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  req_key_h, ans_key_h, key_changed_h, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0
-};