* @author Christian Grothoff
*
* TODO:
- * - define mesh message formats between VPN and EXIT!
* - build mesh messages
* - parse mesh replies
* - build IP messages from mesh replies
#include "gnunet_constants.h"
#include "tcpip_tun.h"
#include "vpn.h"
-
+#include "exit.h"
/**
* Information we track for each IP address to determine which tunnel
}
+/**
+ * Notify the client about the result of its request.
+ *
+ * @param client client to notify
+ * @param request_id original request ID to include in response
+ * @param result_af resulting address family
+ * @param addr resulting IP address
+ */
+static void
+send_client_reply (struct GNUNET_SERVER_Client *client,
+ uint64_t request_id,
+ int result_af,
+ const void *addr)
+{
+ char buf[sizeof (struct RedirectToIpResponseMessage) + sizeof (struct in6_addr)];
+ struct RedirectToIpResponseMessage *res;
+ size_t rlen;
+
+ switch (result_af)
+ {
+ case AF_INET:
+ rlen = sizeof (struct in_addr);
+ break;
+ case AF_INET6:
+ rlen = sizeof (struct in6_addr);
+ break;
+ case AF_UNSPEC:
+ rlen = 0;
+ break;
+ default:
+ GNUNET_assert (0);
+ return;
+ }
+ res = (struct RedirectToIpResponseMessage *) buf;
+ res->header.size = htons (sizeof (struct RedirectToIpResponseMessage) + rlen);
+ res->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_CLIENT_USE_IP);
+ res->result_af = htonl (result_af);
+ res->request_id = request_id;
+ memcpy (&res[1], addr, rlen);
+ GNUNET_SERVER_notification_context_add (nc, client);
+ GNUNET_SERVER_notification_context_unicast (nc,
+ client,
+ &res->header,
+ GNUNET_NO);
+}
+
+
+/**
+ * Method called whenever a peer has disconnected from the tunnel.
+ *
+ * @param cls closure
+ * @param peer peer identity the tunnel stopped working with
+ */
+static void
+tunnel_peer_disconnect_handler (void *cls,
+ const struct
+ GNUNET_PeerIdentity * peer)
+{
+ /* FIXME: should we do anything here?
+ - stop transmitting to the tunnel (start queueing?)
+ - possibly destroy the tunnel entirely (unless service tunnel?)
+ */
+}
+
+
+/**
+ * Method called whenever a peer has connected to the tunnel. Notifies
+ * the waiting client that the tunnel is now up.
+ *
+ * @param cls closure
+ * @param peer peer identity the tunnel was created to, NULL on timeout
+ * @param atsi performance data for the connection
+ */
+static void
+tunnel_peer_connect_handler (void *cls,
+ const struct GNUNET_PeerIdentity
+ * peer,
+ const struct
+ GNUNET_ATS_Information * atsi)
+{
+ struct TunnelState *ts = cls;
+
+ if (NULL == ts->client)
+ return; /* nothing to do */
+ send_client_reply (ts->client,
+ ts->request_id,
+ ts->af,
+ &ts->destination_ip);
+ GNUNET_SERVER_client_drop (ts->client);
+ ts->client = NULL;
+}
+
+
/**
* Send a message from the message queue via mesh.
*
*/
static void
send_to_tunnel (struct TunnelMessageQueueEntry *tnq,
- struct TunnelState *ts)
+ struct TunnelState *ts)
{
GNUNET_CONTAINER_DLL_insert_tail (ts->head,
ts->tail,
GNUNET_HashCode key;
struct TunnelState *ts;
struct TunnelMessageQueueEntry *tnq;
-
+ size_t alen;
+ size_t mlen;
+ GNUNET_MESH_ApplicationType app_type;
+ int is_new;
+ const struct udp_packet *udp;
+ const struct tcp_packet *tcp;
+
switch (protocol)
{
case IPPROTO_UDP:
{
- const struct udp_packet *udp;
-
if (payload_length < sizeof (struct udp_packet))
{
/* blame kernel? */
break;
case IPPROTO_TCP:
{
- const struct tcp_packet *tcp;
-
if (payload_length < sizeof (struct tcp_packet))
{
/* blame kernel? */
return;
}
+ if (! destination->is_service)
+ {
+ switch (destination->details.exit_destination.af)
+ {
+ case AF_INET:
+ alen = sizeof (struct in_addr);
+ app_type = GNUNET_APPLICATION_TYPE_IPV4_GATEWAY;
+ break;
+ case AF_INET6:
+ alen = sizeof (struct in6_addr);
+ app_type = GNUNET_APPLICATION_TYPE_IPV6_GATEWAY;
+ break;
+ default:
+ alen = 0;
+ GNUNET_assert (0);
+ }
+ }
+ else
+ {
+ /* make compiler happy */
+ alen = 0;
+ app_type = 0;
+ }
+
+ // FIXME: something is horrifically wrong here about
+ // how we lookup 'ts', match it and how we decide about
+ // creating new tunnels!
/* find tunnel */
+ is_new = GNUNET_NO;
ts = GNUNET_CONTAINER_multihashmap_get (tunnel_map,
&key);
if (NULL == ts)
{
/* create new tunnel */
- // FIXME: create tunnel!
-#if 0
- *cls =
- GNUNET_MESH_tunnel_create (mesh_handle,
- initialize_tunnel_state (16, NULL),
- &send_pkt_to_peer, NULL, cls);
-
- GNUNET_MESH_peer_request_connect_add (*cls,
- (struct GNUNET_PeerIdentity *)
- &me->desc);
- me->tunnel = *cls;
-#endif
+ is_new = GNUNET_YES;
+ ts = GNUNET_malloc (sizeof (struct TunnelState));
+ ts->destination.tunnel = GNUNET_MESH_tunnel_create (mesh_handle,
+ ts,
+ &tunnel_peer_connect_handler,
+ &tunnel_peer_disconnect_handler,
+ ts);
+ if (destination->is_service)
+ GNUNET_MESH_peer_request_connect_add (ts->destination.tunnel,
+ &destination->details.service_destination.target);
+ else
+ GNUNET_MESH_peer_request_connect_by_type (ts->destination.tunnel,
+ app_type);
}
/* send via tunnel */
case IPPROTO_UDP:
if (destination->is_service)
{
- tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) + 42);
+ struct GNUNET_EXIT_UdpServiceMessage *usm;
+
+ mlen = sizeof (struct GNUNET_EXIT_UdpServiceMessage) +
+ payload_length - sizeof (struct udp_packet);
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) + mlen);
+ usm = (struct GNUNET_EXIT_UdpServiceMessage *) &tnq[1];
+ usm->header.size = htons ((uint16_t) mlen);
+ usm->service_descriptor = destination->details.service_destination.service_descriptor;
// FIXME: build message!
}
else
{
- tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) + 42);
+ struct GNUNET_EXIT_UdpInternetMessage *uim;
+
+ mlen = sizeof (struct GNUNET_EXIT_UdpInternetMessage) +
+ alen + payload_length - sizeof (struct udp_packet);
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) +
+ mlen);
+ uim = (struct GNUNET_EXIT_UdpInternetMessage *) &tnq[1];
+ uim->header.size = htons ((uint16_t) mlen);
+ uim->af = htonl (destination->details.exit_destination.af);
+
// FIXME: build message!
}
break;
case IPPROTO_TCP:
- if (destination->is_service)
+ if (is_new)
{
- tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) + 42);
- // FIXME: build message!
+ if (destination->is_service)
+ {
+ struct GNUNET_EXIT_TcpServiceStartMessage *tsm;
+
+ mlen = sizeof (struct GNUNET_EXIT_TcpServiceStartMessage) +
+ payload_length - sizeof (struct tcp_packet);
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) + mlen);
+ tsm = (struct GNUNET_EXIT_TcpServiceStartMessage *) &tnq[1];
+ tsm->header.size = htons ((uint16_t) mlen);
+ // FIXME: build message!
+ }
+ else
+ {
+ struct GNUNET_EXIT_TcpInternetStartMessage *tim;
+
+ mlen = sizeof (struct GNUNET_EXIT_TcpInternetStartMessage) +
+ alen + payload_length - sizeof (struct tcp_packet);
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) + mlen);
+ tim = (struct GNUNET_EXIT_TcpInternetStartMessage *) &tnq[1];
+ tim->header.size = htons ((uint16_t) mlen);
+ // FIXME: build message!
+ }
}
else
{
- tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) + 42);
+ struct GNUNET_EXIT_TcpDataMessage *tdm;
+
+ mlen = sizeof (struct GNUNET_EXIT_TcpDataMessage) +
+ alen + payload_length - sizeof (struct tcp_packet);
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ tnq = GNUNET_malloc (sizeof (struct TunnelMessageQueueEntry) + mlen);
+ tdm = (struct GNUNET_EXIT_TcpDataMessage *) &tnq[1];
+ tdm->header.size = htons ((uint16_t) mlen);
// FIXME: build message!
- }
+ }
break;
default:
/* not supported above, how can we get here !? */
}
-
/**
* Receive packets from the helper-process (someone send to the local
* virtual tunnel interface). Find the destination mapping, and if it
}
-/**
- * Notify the client about the result of its request.
- *
- * @param client client to notify
- * @param request_id original request ID to include in response
- * @param result_af resulting address family
- * @param addr resulting IP address
- */
-static void
-send_client_reply (struct GNUNET_SERVER_Client *client,
- uint64_t request_id,
- int result_af,
- const void *addr)
-{
- char buf[sizeof (struct RedirectToIpResponseMessage) + sizeof (struct in6_addr)];
- struct RedirectToIpResponseMessage *res;
- size_t rlen;
-
- switch (result_af)
- {
- case AF_INET:
- rlen = sizeof (struct in_addr);
- break;
- case AF_INET6:
- rlen = sizeof (struct in6_addr);
- break;
- case AF_UNSPEC:
- rlen = 0;
- break;
- default:
- GNUNET_assert (0);
- return;
- }
- res = (struct RedirectToIpResponseMessage *) buf;
- res->header.size = htons (sizeof (struct RedirectToIpResponseMessage) + rlen);
- res->header.type = htons (GNUNET_MESSAGE_TYPE_VPN_CLIENT_USE_IP);
- res->result_af = htonl (result_af);
- res->request_id = request_id;
- memcpy (&res[1], addr, rlen);
- GNUNET_SERVER_notification_context_add (nc, client);
- GNUNET_SERVER_notification_context_unicast (nc,
- client,
- &res->header,
- GNUNET_NO);
-}
-
-
-/**
- * Method called whenever a peer has disconnected from the tunnel.
- *
- * @param cls closure
- * @param peer peer identity the tunnel stopped working with
- */
-static void
-tunnel_peer_disconnect_handler (void *cls,
- const struct
- GNUNET_PeerIdentity * peer)
-{
- /* FIXME: should we do anything here?
- - stop transmitting to the tunnel (start queueing?)
- - possibly destroy the tunnel entirely (unless service tunnel?)
- */
-}
-
-
-/**
- * Method called whenever a peer has connected to the tunnel. Notifies
- * the waiting client that the tunnel is now up.
- *
- * @param cls closure
- * @param peer peer identity the tunnel was created to, NULL on timeout
- * @param atsi performance data for the connection
- */
-static void
-tunnel_peer_connect_handler (void *cls,
- const struct GNUNET_PeerIdentity
- * peer,
- const struct
- GNUNET_ATS_Information * atsi)
-{
- struct TunnelState *ts = cls;
-
- if (NULL == ts->client)
- return; /* nothing to do */
- send_client_reply (ts->client,
- ts->request_id,
- ts->af,
- &ts->destination_ip);
- GNUNET_SERVER_client_drop (ts->client);
- ts->client = NULL;
-}
-
-
/**
* A client asks us to setup a redirection via some exit
* node to a particular IP. Setup the redirection and
projects / oweals / gnunet.git / commitdiff