X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=f36538e382899ca4f4d3a27ff4267899fb64f185;hp=0e250da508ab983446c9f1062df9cf1dcff77ec7;hb=2a3e343c7228d5f07176e4b404d895c7adc5bdf9;hpb=16d581be68bb52c08569e34e8a6b87f66b87e8ee

diff --git a/src/protocol.c b/src/protocol.c
index 0e250da5..f36538e3 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -1,6 +1,7 @@
 /*
-    protocol.c -- handle the meta-protocol
-    Copyright (C) 1999 Ivo Timmermans <zarq@iname.com>
+    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
@@ -12,769 +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.
+    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 <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <sys/socket.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"
 
-int send_ack(conn_list_t *cl)
-{
-  unsigned char tmp = ACK;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Send ACK to %s", cl->hostname);
-
-  syslog(LOG_NOTICE, "Connection with %s activated.", cl->hostname);
-  if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %d:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_termreq(conn_list_t *cl)
-{
-  termreq_t tmp;
-
-  tmp.type = TERMREQ;
-  tmp.vpn_ip = myself->vpn_ip;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Send TERMREQ(" IP_ADDR_S ") to " IP_ADDR_S, IP_ADDR_V(tmp.vpn_ip),
-	   IP_ADDR_V(cl->vpn_ip));
-
-  if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_timeout(conn_list_t *cl)
-{
-  termreq_t tmp;
-
-  tmp.type = PINGTIMEOUT;
-  tmp.vpn_ip = myself->vpn_ip;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Send TIMEOUT(" IP_ADDR_S ") to " IP_ADDR_S, IP_ADDR_V(tmp.vpn_ip),
-	   IP_ADDR_V(cl->vpn_ip));
-
-  if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_del_host(conn_list_t *cl, conn_list_t *new_host)
-{
-  del_host_t tmp;
-
-  tmp.type = DEL_HOST;
-  tmp.vpn_ip = new_host->vpn_ip;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Sending delete host %lx to " IP_ADDR_S,
-	   tmp.vpn_ip, IP_ADDR_V(cl->vpn_ip));
-
-  if((send(cl->meta_socket, (unsigned char*)&tmp, sizeof(del_host_t), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_ping(conn_list_t *cl)
-{
-  unsigned char tmp = PING;
-
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "pinging " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip));
-
-  if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_pong(conn_list_t *cl)
-{
-  unsigned char tmp = PONG;
-
-  if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_add_host(conn_list_t *cl, conn_list_t *new_host)
-{
-  add_host_t tmp;
-
-  tmp.type = ADD_HOST;
-  tmp.real_ip = new_host->real_ip;
-  tmp.vpn_ip = new_host->vpn_ip;
-  tmp.vpn_mask = new_host->vpn_mask;
-  tmp.portnr = new_host->port;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Sending add host (%lx/%lx %lx:%hd) to " IP_ADDR_S,
-	   tmp.vpn_ip, tmp.vpn_mask, tmp.real_ip, tmp.portnr,
-	   IP_ADDR_V(cl->vpn_ip));
-
-  if((send(cl->meta_socket, (unsigned char*)&tmp, sizeof(add_host_t), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_key_changed(conn_list_t *cl, conn_list_t *src)
-{
-  key_changed_t tmp;
-
-  tmp.type = KEY_CHANGED;
-  tmp.from = src->vpn_ip;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Sending KEY_CHANGED (%lx) to " IP_ADDR_S,
-	   tmp.from, IP_ADDR_V(cl->vpn_ip));
-
-  if((send(cl->meta_socket, (unsigned char*)&tmp, sizeof(key_changed_t), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-void send_key_changed2(void)
-{
-  conn_list_t *p;
-
-  for(p = conn_list; p != NULL; p = p->next)
-    if(p->status.meta && p->protocol_version > PROT_3)
-      send_key_changed(p, myself);
-}
-
-int send_basic_info(conn_list_t *cl)
-{
-  basic_info_t tmp;
-
-  tmp.type = BASIC_INFO;
-  tmp.protocol = PROT_CURRENT;
-
-  tmp.portnr = myself->port;
-  tmp.vpn_ip = myself->vpn_ip;
-  tmp.vpn_mask = myself->vpn_mask;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Send BASIC_INFO(%d,%hd," IP_ADDR_S "," IP_ADDR_S ") to " IP_ADDR_S,
-	   tmp.protocol, tmp.portnr, IP_ADDR_V(tmp.vpn_ip), IP_ADDR_V(tmp.vpn_mask),
-	   IP_ADDR_V(cl->real_ip));
-
-  if((send(cl->meta_socket, &tmp, sizeof(tmp), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_passphrase(conn_list_t *cl)
-{
-  passphrase_t tmp;
-
-  tmp.type = PASSPHRASE;
-  encrypt_passphrase(&tmp);
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Send PASSPHRASE(%hd,...) to " IP_ADDR_S, tmp.len,
-	   IP_ADDR_V(cl->vpn_ip));
-
-  if((send(cl->meta_socket, &tmp, tmp.len+3, 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_public_key(conn_list_t *cl)
-{
-  public_key_t *tmp;
-
-  tmp = (public_key_t*)xmalloc(strlen(my_public_key_base36)+sizeof(public_key_t));
-  tmp->type = PUBLIC_KEY;
-  tmp->len = strlen(my_public_key_base36);
-  strcpy(&tmp->key, my_public_key_base36);
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Send PUBLIC_KEY(%hd,%s) to " IP_ADDR_S, tmp->len, &tmp->key,
-	   IP_ADDR_V(cl->vpn_ip));
-
-  if((send(cl->meta_socket, tmp, tmp->len+sizeof(public_key_t), 0)) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_calculate(conn_list_t *cl, char *k)
-{
-  calculate_t *tmp;
-
-  tmp = xmalloc(strlen(k)+sizeof(calculate_t));
-  tmp->type = CALCULATE;
-  tmp->len = strlen(k);
-  strcpy(&tmp->key, k);
-
-  if(send(cl->meta_socket, tmp, tmp->len+4, 0) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-int send_key_request(ip_t to)
-{
-  key_req_t *tmp;
-  conn_list_t *fw;
-
-  tmp = xmalloc(sizeof(key_req_t));
-  tmp->type = REQ_KEY;
-  tmp->to = to;
-  tmp->from = myself->vpn_ip;
-  tmp->len = 0;
-
-  fw = lookup_conn(to);
-  if(!fw)
-    {
-      syslog(LOG_ERR, "Attempting to send key request to " IP_ADDR_S ", which does not exist?",
-	     IP_ADDR_V(to));
-      return -1;
-    }
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Sending out request for public key to " IP_ADDR_S,
-	   IP_ADDR_V(fw->nexthop->vpn_ip));
-  if(send(fw->nexthop->meta_socket, tmp, sizeof(key_req_t), 0) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-  fw->status.waitingforkey = 1;
-
-  return 0;
-}
-
-int send_key_answer(conn_list_t *cl, ip_t to)
-{
-  key_req_t *tmp;
-  conn_list_t *fw;
-
-  tmp = xmalloc(sizeof(key_req_t)+strlen(my_public_key_base36));
-  tmp->type = ANS_KEY;
-  tmp->to = to;
-  tmp->from = myself->vpn_ip;
-  tmp->expiry = my_key_expiry;
-  tmp->len = strlen(my_public_key_base36);
-  strcpy(&tmp->key, my_public_key_base36);
-
-  fw = lookup_conn(to);
-  
-  if(!fw)
-  {
-    syslog(LOG_ERR, "Attempting to send key answer to " IP_ADDR_S ", which does not exist?",
-	   IP_ADDR_V(to));
-    return -1;
-  }
-  
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Sending public key to " IP_ADDR_S,
-	   IP_ADDR_V(fw->nexthop->vpn_ip));
-  if(send(fw->nexthop->meta_socket, tmp, sizeof(key_req_t)+tmp->len, 0) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  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;
-
-  for(p = conn_list; p != NULL; p = p->next)
-    if(p != new && p != source && p->status.meta && p->protocol_version > PROT_3)
-      function(p, new);
-
-  return 0;
-}
-
-/*
-  notify one connection of everything
-  i have connected
-*/
-int notify_one(conn_list_t *new)
-{
-  conn_list_t *p;
-
-  for(p = conn_list; p != NULL; p = p->next)
-    if(p != new && p->protocol_version > PROT_3)
-      send_add_host(new, p);
-
-  return 0;
-}
-
-/*
-  The incoming request handlers
-*/
-
-int basic_info_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  basic_info_t *tmp = (basic_info_t*)d;
-
-  cl->protocol_version = tmp->protocol;
-  cl->port = tmp->portnr;
-  cl->vpn_ip = tmp->vpn_ip;
-  cl->vpn_mask = tmp->vpn_mask;
-
-  if(cl->protocol_version < PROT_CURRENT)
-    {
-      syslog(LOG_ERR, "Peer uses protocol version %d which is too old.",
-	     cl->protocol_version);
-      return -1;
-    }
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "got BASIC_INFO(%hd," IP_ADDR_S "," IP_ADDR_S ")", cl->port,
-	   IP_ADDR_V(cl->vpn_ip), IP_ADDR_V(cl->vpn_mask));
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, "Peer uses protocol version %d",
-	   cl->protocol_version);
-
-  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);
-    }
-
-  cl->status.active = 0;
-
-  return 0;
-}
-
-int passphrase_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  passphrase_t *tmp = (passphrase_t*)d;
-
-  cl->pp = xmalloc(tmp->len+3);
-  memcpy(cl->pp, tmp, tmp->len+3);
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "got PASSPHRASE(%hd,...)", cl->pp->len);
-
-  if(cl->status.outgoing)
-    send_passphrase(cl);
-  else
-    send_public_key(cl);
-
-  return 0;
-}
-
-int public_key_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  char *g_n;
-  public_key_t *tmp = (public_key_t*)d;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "got PUBLIC_KEY(%hd,%s)", tmp->len, &tmp->key);
-
-  g_n = xmalloc(tmp->len+1);
-  strcpy(g_n, &tmp->key);
-
-  if(verify_passphrase(cl, g_n))
-    {
-      /* intruder! */
-      syslog(LOG_ERR, "Intruder: passphrase does not match.");
-      return -1;
-    }
-
-  if(debug_lvl > 2)
-    syslog(LOG_INFO, "Passphrase OK");
-
-  if(cl->status.outgoing)
-    send_public_key(cl);
-  else
-    send_ack(cl);
-
-  cl->status.active = 1;
-  notify_others(cl, NULL, send_add_host);
-  notify_one(cl);
-
-  return 0;
-}
-
-int ack_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "got ACK");
-  
-  cl->status.active = 1;
-  syslog(LOG_NOTICE, "Connection with %s activated.", cl->hostname);
-
-  /*
-    Now I'm going to cheat. The meta protocol is actually
-    a stream of requests, that may come in in the same TCP
-    packet. This is the only place that it will happen,
-    though.
-    I may change it in the future, if it appears that this
-    is not retainable.
-  */
-  if(len > 1) /* An ADD_HOST follows */
-    {
-      if(request_handlers[d[1]] == NULL)
-	syslog(LOG_ERR, "Unknown request %d.", d[1]);
-      if(request_handlers[d[1]](cl, d + 1, len - 1) < 0)
-	return -1;
-    }
-
-  return 0;
-}
-
-int termreq_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  syslog(LOG_NOTICE, IP_ADDR_S " wants to quit", IP_ADDR_V(cl->vpn_ip));
-  cl->status.termreq = 1;
-  terminate_connection(cl);
-
-  notify_others(cl, NULL, send_del_host);
-
-  return 0;
-}
-
-int timeout_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  syslog(LOG_NOTICE, IP_ADDR_S " says it's gotten a timeout from us", IP_ADDR_V(cl->vpn_ip));
-  cl->status.termreq = 1;
-  terminate_connection(cl);
-
-  return 0;
-}
-
-int del_host_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  del_host_t *tmp = (del_host_t*)d;
-  conn_list_t *fw;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "got DEL_HOST for " IP_ADDR_S,
-	   IP_ADDR_V(tmp->vpn_ip));
-
-  if(!(fw = lookup_conn(tmp->vpn_ip)))
-    {
-      syslog(LOG_ERR, "Somebody wanted to delete " IP_ADDR_S " which does not exist?",
-	     IP_ADDR_V(tmp->vpn_ip));
-      return 0;
-    }
-
-  notify_others(cl, fw, send_del_host);
-
-  fw->status.termreq = 1;
-  terminate_connection(fw);
-
-  return 0;
-}
-
-int ping_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "responding to ping from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip));
-  cl->status.pinged = 0;
-  cl->status.got_pong = 1;
-
-  send_pong(cl);
-  
-  return 0;
-}
+bool tunnelserver = false;
+bool strictsubnets = false;
 
-int pong_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "ok, got pong from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip));
-  cl->status.got_pong = 1;
+/* Jumptable for the request handlers */
 
-  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 add_host_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  add_host_t *tmp = (add_host_t*)d;
-  conn_list_t *ncn, *fw;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Add host request from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip));
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "got ADD_HOST(" IP_ADDR_S "," IP_ADDR_S ",%hd)",
-	   IP_ADDR_V(tmp->vpn_ip), IP_ADDR_V(tmp->vpn_mask), tmp->portnr);
-
-  /*
-    Suggestion of Hans Bayle
-  */
-  if((fw = lookup_conn(tmp->vpn_ip)))
-    {
-      notify_others(fw, cl, send_add_host);
-      return 0;
-    }
-
-  ncn = new_conn_list();
-  ncn->real_ip = tmp->real_ip;
-  ncn->vpn_ip = tmp->vpn_ip;
-  ncn->vpn_mask = tmp->vpn_mask;
-  ncn->port = tmp->portnr;
-  ncn->hostname = hostlookup(tmp->real_ip);
-  ncn->nexthop = cl;
-  ncn->next = conn_list;
-  conn_list = ncn;
-  ncn->status.active = 1;
-  notify_others(ncn, cl, send_add_host);
-
-  /*
-    again, i'm cheating here. see the comment in ack_h.
-    Naughty zarq! Now you see what cheating will get you... [GS]
-  */
-  if(len > sizeof(add_host_t)) /* Another ADD_HOST follows */
-    {
-      if(request_handlers[d[sizeof(add_host_t)]] == NULL)
-	syslog(LOG_ERR, "Unknown request %d.", d[sizeof(add_host_t)]);
-      if(request_handlers[d[sizeof(add_host_t)]](cl, d + sizeof(add_host_t), len - sizeof(add_host_t)) < 0)
-	return -1;
-    }
-
-  return 0;
-}
+/* Request names */
 
-int req_key_h(conn_list_t *cl, unsigned char *d, int len)
-{
-  key_req_t *tmp = (key_req_t*)d;
-  conn_list_t *fw;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "got REQ_KEY from " IP_ADDR_S " for " IP_ADDR_S,
-	   IP_ADDR_V(tmp->from), IP_ADDR_V(tmp->to));
-
-  if((tmp->to & myself->vpn_mask) == (myself->vpn_ip & myself->vpn_mask))
-    {  /* hey! they want something from ME! :) */
-      send_key_answer(cl, tmp->from);
-      return 0;
-    }
-
-  fw = lookup_conn(tmp->to);
-  
-  if(!fw)
-  {
-    syslog(LOG_ERR, "Attempting to forward key request to " IP_ADDR_S ", which does not exist?",
-	   IP_ADDR_V(tmp->to));
-    return -1;
-  }
-
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "Forwarding request for public key to " IP_ADDR_S,
-	   IP_ADDR_V(fw->nexthop->vpn_ip));
-  if(send(fw->nexthop->meta_socket, tmp, sizeof(key_req_t), 0) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  return 0;
-}
-
-void set_keys(conn_list_t *cl, key_req_t *k)
-{
-  char *ek;
-
-  if(!cl->public_key)
-    {
-      cl->public_key = xmalloc(sizeof(enc_key_t));
-      cl->public_key->key = NULL;
-    }
-  if(cl->public_key->key)
-    free(cl->public_key->key);
-  cl->public_key->length = k->len;
-  cl->public_key->expiry = k->expiry;
-  cl->public_key->key = xmalloc(k->len + 1);
-  strcpy(cl->public_key->key, &(k->key));
-
-  ek = make_shared_key(&(k->key));
-  if(!cl->key)
-    {
-      cl->key = xmalloc(sizeof(enc_key_t));
-      cl->key->key = NULL;
-    }
-  if(cl->key->key)
-    free(cl->key->key);
-  cl->key->length = strlen(ek);
-  cl->key->expiry = k->expiry;
-  cl->key->key = xmalloc(strlen(ek) + 1);
-  strcpy(cl->key->key, ek);
-}
+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, unsigned char *d, int len)
-{
-  key_req_t *tmp = (key_req_t*)d;
-  conn_list_t *fw, *gk;
-
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "got ANS_KEY from " IP_ADDR_S " for " IP_ADDR_S,
-	   IP_ADDR_V(tmp->from), IP_ADDR_V(tmp->to));
-
-  if(tmp->to == myself->vpn_ip)
-    {  /* hey! that key's for ME! :) */
-      if(debug_lvl > 2)
-	syslog(LOG_DEBUG, "Yeah! key arrived. Now do something with it.");
-      gk = lookup_conn(tmp->from);
-
-      if(!gk)
-        {
-          syslog(LOG_ERR, "Receiving key from " IP_ADDR_S ", which does not exist?",
-	         IP_ADDR_V(tmp->from));
-          return -1;
-        }
-
-      set_keys(gk, tmp);
-      gk->status.validkey = 1;
-      gk->status.waitingforkey = 0;
-      flush_queues(gk);
-      return 0;
-    }
-
-  fw = lookup_conn(tmp->to);
-  
-  if(!fw)
-  {
-    syslog(LOG_ERR, "Attempting to forward key to " IP_ADDR_S ", which does not exist?",
-	   IP_ADDR_V(tmp->to));
-    return -1;
-  }
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "Forwarding public key to " IP_ADDR_S,
-	   IP_ADDR_V(fw->nexthop->vpn_ip));
-  if(send(fw->nexthop->meta_socket, tmp, sizeof(key_req_t)+tmp->len, 0) < 0)
-    {
-      syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__);
-      return -1;
-    }
-
-  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, unsigned char *d, int len)
-{
-  key_changed_t *tmp = (key_changed_t*)d;
-  conn_list_t *ik;
-
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "got KEY_CHANGED from " IP_ADDR_S,
-	   IP_ADDR_V(tmp->from));
-
-  ik = lookup_conn(tmp->from);
-
-  if(!ik)
-    {
-      syslog(LOG_ERR, "Got changed key from " IP_ADDR_S ", which does not exist?",
-	     IP_ADDR_V(tmp->from));
-      return -1;
-    }
-
-  ik->status.validkey = 0;
-  ik->status.waitingforkey = 0;
-
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "Forwarding key invalidation request");
-
-  notify_others(cl, ik, send_key_changed);
-
-  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*, unsigned char*, int) = {
-  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
-};
-