3 files changed, 852 insertions, 0 deletions

diff --git a/src/transport/gnunet-service-transport_3way.c b/src/transport/gnunet-service-transport_3way.c
new file mode 100644
index 000000000..a24d6c1b1
--- /dev/null
+++ b/src/transport/gnunet-service-transport_3way.c
@@ -0,0 +1,580 @@
+/*
+     This file is part of GNUnet.
+     (C) 2010,2011 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     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 GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file transport/gnunet-service-transport-new.c
+ * @brief
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_statistics_service.h"
+#include "gnunet_transport_service.h"
+#include "gnunet_peerinfo_service.h"
+#include "gnunet_ats_service.h"
+#include "gnunet-service-transport.h"
+#include "gnunet-service-transport_blacklist.h"
+#include "gnunet-service-transport_clients.h"
+#include "gnunet-service-transport_hello.h"
+#include "gnunet-service-transport_neighbours.h"
+#include "gnunet-service-transport_plugins.h"
+#include "gnunet-service-transport_validation.h"
+#include "transport.h"
+
+/* globals */
+
+/**
+ * Statistics handle.
+ */
+struct GNUNET_STATISTICS_Handle *GST_stats;
+
+/**
+ * Configuration handle.
+ */
+const struct GNUNET_CONFIGURATION_Handle *GST_cfg;
+
+/**
+ * Configuration handle.
+ */
+struct GNUNET_PeerIdentity GST_my_identity;
+
+/**
+ * Handle to peerinfo service.
+ */
+struct GNUNET_PEERINFO_Handle *GST_peerinfo;
+
+/**
+ * Our public key.
+ */
+struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded GST_my_public_key;
+
+/**
+ * Our private key.
+ */
+struct GNUNET_CRYPTO_RsaPrivateKey *GST_my_private_key;
+
+/**
+ * ATS handle.
+ */
+struct GNUNET_ATS_SchedulingHandle *GST_ats;
+
+
+/**
+ * Transmit our HELLO message to the given (connected) neighbour.
+ *
+ * @param cls the 'HELLO' message
+ * @param target a connected neighbour
+ * @param ats performance information (unused)
+ * @param ats_count number of records in ats (unused)
+ * @param transport plugin
+ * @param addr address
+ * @param addrlen address length
+ */
+static void
+transmit_our_hello (void *cls, const struct GNUNET_PeerIdentity *target,
+                    const struct GNUNET_ATS_Information *ats,
+                    uint32_t ats_count,
+                    const char * transport,
+                    const void * addr,
+                    size_t addrlen)
+{
+  const struct GNUNET_MessageHeader *hello = cls;
+
+  GST_neighbours_send (target, (const char *) hello, ntohs (hello->size),
+                       GNUNET_CONSTANTS_HELLO_ADDRESS_EXPIRATION, NULL, NULL);
+}
+
+
+/**
+ * My HELLO has changed. Tell everyone who should know.
+ *
+ * @param cls unused
+ * @param hello new HELLO
+ */
+static void
+process_hello_update (void *cls, const struct GNUNET_MessageHeader *hello)
+{
+  GST_clients_broadcast (hello, GNUNET_NO);
+  GST_neighbours_iterate (&transmit_our_hello, (void *) hello);
+}
+
+
+
+/**
+ * We received some payload.  Prepare to pass it on to our clients. 
+ *
+ * @param peer (claimed) identity of the other peer
+ * @param message the message, NULL if we only care about
+ *                learning about the delay until we should receive again -- FIXME!
+ * @param ats performance information
+ * @param ats_count number of records in ats
+ * @return how long the plugin should wait until receiving more data
+ */
+static struct GNUNET_TIME_Relative
+process_payload (const struct GNUNET_PeerIdentity *peer,
+                 const struct GNUNET_MessageHeader *message,
+                 const struct GNUNET_ATS_Information *ats,
+                 uint32_t ats_count)
+{
+  struct GNUNET_TIME_Relative ret;
+  int do_forward;
+  struct InboundMessage *im;
+  size_t size = sizeof (struct InboundMessage) + ntohs (message->size) + sizeof (struct GNUNET_ATS_Information) * ats_count;
+  char buf[size];
+  struct GNUNET_ATS_Information *ap;
+  
+  ret = GNUNET_TIME_UNIT_ZERO;
+  do_forward = GNUNET_SYSERR;
+  ret =
+    GST_neighbours_calculate_receive_delay (peer,
+                                            (message ==
+                                             NULL) ? 0 :
+                                            ntohs (message->size),
+                                            &do_forward);
+
+  im = (struct InboundMessage*) buf;    
+  im->header.size = htons (size);
+  im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
+  im->ats_count = htonl (ats_count);
+  im->peer = *peer;
+  ap = (struct GNUNET_ATS_Information*) &im[1];
+  memcpy (ap, ats, ats_count * sizeof (struct GNUNET_ATS_Information));
+  memcpy (&ap[ats_count], message, ntohs (message->size));
+
+  switch (do_forward)
+  {
+  case GNUNET_YES:
+    GST_clients_broadcast (&im->header, GNUNET_YES);      
+    break;
+  case GNUNET_NO:
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                _("Discarded %u bytes of type %u from %s: quota violated or no neighbour record!\n"),
+                ntohs (message->size),
+                ntohs (message->type),
+                GNUNET_i2s (peer));
+    break;
+  case GNUNET_SYSERR:
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                _("Discarded %u bytes of type %u from %s: connection is down!\n"),
+                ntohs (message->size),
+                ntohs (message->type),
+                GNUNET_i2s (peer));
+    /* FIXME: store until connection is up? This is virtually always a SETKEY and a PING... */
+    break;
+  default:
+    GNUNET_break (0);
+    break;
+  }    
+  return ret;
+}
+
+
+/**
+ * Function called by the transport for each received message.
+ * This function should also be called with "NULL" for the
+ * message to signal that the other peer disconnected.
+ *
+ * @param cls closure, const char* with the name of the plugin we received the message from
+ * @param peer (claimed) identity of the other peer
+ * @param message the message, NULL if we only care about
+ *                learning about the delay until we should receive again -- FIXME!
+ * @param ats performance information
+ * @param ats_count number of records in ats
+ * @param session identifier used for this session (NULL for plugins
+ *                that do not offer bi-directional communication to the sender
+ *                using the same "connection")
+ * @param sender_address binary address of the sender (if we established the
+ *                connection or are otherwise sure of it; should be NULL
+ *                for inbound TCP/UDP connections since it it not clear
+ *                that we could establish ourselves a connection to that
+ *                IP address and get the same system)
+ * @param sender_address_len number of bytes in sender_address
+ * @return how long the plugin should wait until receiving more data
+ *         (plugins that do not support this, can ignore the return value)
+ */
+static struct GNUNET_TIME_Relative
+plugin_env_receive_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
+                             const struct GNUNET_MessageHeader *message,
+                             const struct GNUNET_ATS_Information *ats,
+                             uint32_t ats_count, struct Session *session,
+                             const char *sender_address,
+                             uint16_t sender_address_len)
+{
+  const char *plugin_name = cls;
+  struct GNUNET_TIME_Relative ret;
+  uint16_t type;
+  
+  ret = GNUNET_TIME_UNIT_ZERO;
+  if (NULL == message)
+    goto end;
+  type = ntohs (message->type);
+#if DEBUG_TRANSPORT
+
+  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Received Message with type %u\n", type);
+#endif
+
+  switch (type)
+  {
+  case GNUNET_MESSAGE_TYPE_HELLO:
+    GST_validation_handle_hello (message);
+    return ret;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
+#if DEBUG_TRANSPORT
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
+                "Processing `%s' from `%s'\n", "PING",
+                (sender_address != NULL) ? GST_plugins_a2s (plugin_name,
+                                                            sender_address,
+                                                            sender_address_len)
+                : "<inbound>");
+#endif
+    GST_validation_handle_ping (peer, message, plugin_name, session,
+                                sender_address, sender_address_len);
+    break;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
+#if DEBUG_TRANSPORT
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
+                "Processing `%s' from `%s'\n", "PONG",
+                (sender_address != NULL) ? GST_plugins_a2s (plugin_name,
+                                                            sender_address,
+                                                            sender_address_len)
+                : "<inbound>");
+#endif
+    GST_validation_handle_pong (peer, message);
+    break;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT:
+    GST_neighbours_handle_connect (message,
+                                   peer,
+                                   plugin_name, sender_address, sender_address_len,
+                                   session, ats, ats_count);
+    break;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK:
+    GST_neighbours_handle_connect_ack (message,
+                                   peer,
+                                   plugin_name, sender_address, sender_address_len,
+                                   session, ats, ats_count);
+    break;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK:
+    GST_neighbours_handle_ack (message,
+                                   peer,
+                                   plugin_name, sender_address, sender_address_len,
+                                   session, ats, ats_count);
+    break;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT:
+    GST_neighbours_handle_disconnect_message (peer, message);
+    break;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE:
+    GST_neighbours_keepalive (peer);
+    break;
+  default:
+    /* should be payload */
+    ret = process_payload (peer,
+                           message,
+                           ats, ats_count);
+    break;
+  }
+ end:
+#if 1
+  /* FIXME: this should not be needed, and not sure it's good to have it, but without
+     this connections seem to go extra-slow */
+  GNUNET_ATS_address_update (GST_ats, peer,
+                             plugin_name, sender_address, sender_address_len,
+                             session,
+                             ats, ats_count);  
+#endif
+#if DEBUG_TRANSPORT
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Allowing receive from peer %s to continue in %llu ms\n",
+              GNUNET_i2s (peer),
+              (unsigned long long) ret.rel_value);
+#endif
+  return ret;
+}
+
+
+/**
+ * Function that will be called for each address the transport
+ * is aware that it might be reachable under.  Update our HELLO.
+ *
+ * @param cls name of the plugin (const char*)
+ * @param add_remove should the address added (YES) or removed (NO) from the
+ *                   set of valid addresses?
+ * @param addr one of the addresses of the host
+ *        the specific address format depends on the transport
+ * @param addrlen length of the address
+ */
+static void
+plugin_env_address_change_notification (void *cls, int add_remove,
+                                        const void *addr, size_t addrlen)
+{
+  const char *plugin_name = cls;
+
+  GST_hello_modify_addresses (add_remove, plugin_name, addr, addrlen);
+}
+
+
+/**
+ * Function that will be called whenever the plugin internally
+ * cleans up a session pointer and hence the service needs to
+ * discard all of those sessions as well.  Plugins that do not
+ * use sessions can simply omit calling this function and always
+ * use NULL wherever a session pointer is needed.  This function
+ * should be called BEFORE a potential "TransmitContinuation"
+ * from the "TransmitFunction".
+ *
+ * @param cls closure
+ * @param peer which peer was the session for
+ * @param session which session is being destoyed
+ */
+static void
+plugin_env_session_end (void *cls, const struct GNUNET_PeerIdentity *peer,
+                        struct Session *session)
+{
+#if DEBUG_TRANSPORT
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+              "Session %X to peer `%s' ended \n",
+              session, GNUNET_i2s (peer));
+#endif
+  if (NULL != session)
+    GNUNET_log_from (GNUNET_ERROR_TYPE_INFO  | GNUNET_ERROR_TYPE_BULK,
+                     "transport-ats",
+                     "Telling ATS to destroy session %p from peer %s\n",
+                     session,              
+                     GNUNET_i2s (peer));
+  GNUNET_ATS_address_destroyed (GST_ats, peer, NULL, NULL, 0, session);
+  GST_neighbours_session_terminated (peer, session);
+}
+
+
+/**
+ * Function called by ATS to notify the callee that the
+ * assigned bandwidth or address for a given peer was changed.  If the
+ * callback is called with address/bandwidth assignments of zero, the
+ * ATS disconnect function will still be called once the disconnect
+ * actually happened.
+ *
+ * @param cls closure
+ * @param peer identity of the peer
+ * @param plugin_name name of the transport plugin, NULL to disconnect
+ * @param session session to use (if available)
+ * @param plugin_addr address to use (if available)
+ * @param plugin_addr_len number of bytes in addr
+ * @param bandwidth_out assigned outbound bandwidth for the connection, 0 to disconnect from peer
+ * @param bandwidth_in assigned inbound bandwidth for the connection, 0 to disconnect from peer
+ */
+static void
+ats_request_address_change (void *cls, const struct GNUNET_PeerIdentity *peer,
+                            const char *plugin_name,
+                            const void *plugin_addr, size_t plugin_addr_len,
+                            struct Session *session,
+                            struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
+                            struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
+                            const struct GNUNET_ATS_Information * ats,
+                            uint32_t ats_count)
+{
+  uint32_t bw_in = ntohl (bandwidth_in.value__);
+  uint32_t bw_out = ntohl (bandwidth_out.value__);
+
+  /* ATS tells me to disconnect from peer*/
+  if ((bw_in == 0) && (bw_out == 0))
+  {
+#if DEBUG_TRANSPORT
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "ATS tells me to disconnect from peer `%s'\n",
+                GNUNET_i2s (peer));
+#endif
+    GST_neighbours_force_disconnect(peer);
+    return;
+  }
+  /* will never return GNUNET_YES since connection is to be established */
+  GST_neighbours_switch_to_address (peer, plugin_name, plugin_addr,
+                                    plugin_addr_len, session, ats, ats_count,
+                                    bandwidth_in, bandwidth_out);
+}
+
+
+/**
+ * Function called to notify transport users that another
+ * peer connected to us.
+ *
+ * @param cls closure
+ * @param peer the peer that connected
+ * @param ats performance data
+ * @param ats_count number of entries in ats
+ */
+static void
+neighbours_connect_notification (void *cls,
+                                 const struct GNUNET_PeerIdentity *peer,
+                                 const struct GNUNET_ATS_Information
+                                 *ats, uint32_t ats_count)
+{
+  size_t len = sizeof (struct ConnectInfoMessage) +
+      ats_count * sizeof (struct GNUNET_ATS_Information);
+  char buf[len];
+  struct ConnectInfoMessage *connect_msg = (struct ConnectInfoMessage *) buf;
+  struct GNUNET_ATS_Information *ap;
+
+  connect_msg->header.size = htons (sizeof (buf));
+  connect_msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
+  connect_msg->ats_count = htonl (ats_count);
+  connect_msg->id = *peer;
+  ap = (struct GNUNET_ATS_Information *) &connect_msg[1];
+  memcpy (ap, ats,
+          ats_count * sizeof (struct GNUNET_ATS_Information));
+  GST_clients_broadcast (&connect_msg->header, GNUNET_NO);
+}
+
+
+/**
+ * Function called to notify transport users that another
+ * peer disconnected from us.
+ *
+ * @param cls closure
+ * @param peer the peer that disconnected
+ */
+static void
+neighbours_disconnect_notification (void *cls,
+                                    const struct GNUNET_PeerIdentity *peer)
+{
+  struct DisconnectInfoMessage disconnect_msg;
+
+  disconnect_msg.header.size = htons (sizeof (struct DisconnectInfoMessage));
+  disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
+  disconnect_msg.reserved = htonl (0);
+  disconnect_msg.peer = *peer;
+  GST_clients_broadcast (&disconnect_msg.header, GNUNET_NO);
+}
+
+
+/**
+ * Function called when the service shuts down.  Unloads our plugins
+ * and cancels pending validations.
+ *
+ * @param cls closure, unused
+ * @param tc task context (unused)
+ */
+static void
+shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  GST_validation_stop ();
+  GST_plugins_unload ();
+  GST_neighbours_stop ();
+  GNUNET_ATS_scheduling_done (GST_ats);
+  GST_ats = NULL;
+  GST_clients_stop ();
+  GST_blacklist_stop ();
+  GST_hello_stop ();
+
+  if (GST_peerinfo != NULL)
+  {
+    GNUNET_PEERINFO_disconnect (GST_peerinfo);
+    GST_peerinfo = NULL;
+  }
+  if (GST_stats != NULL)
+  {
+    GNUNET_STATISTICS_destroy (GST_stats, GNUNET_NO);
+    GST_stats = NULL;
+  }
+  if (GST_my_private_key != NULL)
+  {
+    GNUNET_CRYPTO_rsa_key_free (GST_my_private_key);
+    GST_my_private_key = NULL;
+  }
+}
+
+
+/**
+ * Initiate transport service.
+ *
+ * @param cls closure
+ * @param server the initialized server
+ * @param c configuration to use
+ */
+static void
+run (void *cls, struct GNUNET_SERVER_Handle *server,
+     const struct GNUNET_CONFIGURATION_Handle *c)
+{
+  char *keyfile;
+
+  /* setup globals */
+  GST_cfg = c;
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
+                                               &keyfile))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _
+                ("Transport service is lacking key configuration settings.  Exiting.\n"));
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+  GST_my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
+  GNUNET_free (keyfile);
+  if (GST_my_private_key == NULL)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _("Transport service could not access hostkey.  Exiting.\n"));
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+  GST_stats = GNUNET_STATISTICS_create ("transport", c);
+  GST_peerinfo = GNUNET_PEERINFO_connect (c);
+  GNUNET_CRYPTO_rsa_key_get_public (GST_my_private_key, &GST_my_public_key);
+  GNUNET_CRYPTO_hash (&GST_my_public_key, sizeof (GST_my_public_key),
+                      &GST_my_identity.hashPubKey);
+  GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
+                                NULL);
+  if (GST_peerinfo == NULL)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                _("Could not access PEERINFO service.  Exiting.\n"));
+    GNUNET_SCHEDULER_shutdown ();
+    return;
+  }
+
+  /* start subsystems */
+  GST_hello_start (&process_hello_update, NULL);
+  GST_blacklist_start (server);
+  GST_plugins_load (&plugin_env_receive_callback,
+                    &plugin_env_address_change_notification,
+                    &plugin_env_session_end);
+  GST_ats = GNUNET_ATS_scheduling_init (GST_cfg, &ats_request_address_change, NULL);
+  GST_neighbours_start (NULL, &neighbours_connect_notification,
+                        &neighbours_disconnect_notification);
+  GST_clients_start (server);
+  GST_validation_start ();
+}
+
+
+/**
+ * The main function for the transport service.
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc, char *const *argv)
+{
+  return (GNUNET_OK ==
+          GNUNET_SERVICE_run (argc, argv, "transport",
+                              GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
+}
+
+/* end of file gnunet-service-transport-new.c */
diff --git a/src/transport/gnunet-service-transport_neighbours_fsm.c b/src/transport/gnunet-service-transport_neighbours_3way.c
index fd3ad37f9..fd3ad37f9 100644
--- a/src/transport/gnunet-service-transport_neighbours_fsm.c
+++ b/src/transport/gnunet-service-transport_neighbours_3way.c
diff --git a/src/transport/gnunet-service-transport_neighbours_3way.h b/src/transport/gnunet-service-transport_neighbours_3way.h
new file mode 100644
index 000000000..88790449e
--- /dev/null
+++ b/src/transport/gnunet-service-transport_neighbours_3way.h
@@ -0,0 +1,272 @@
+/*
+     This file is part of GNUnet.
+     (C) 2010,2011 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     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 GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file transport/gnunet-service-transport_neighbours.h
+ * @brief neighbour management API
+ * @author Christian Grothoff
+ */
+#ifndef GNUNET_SERVICE_TRANSPORT_NEIGHBOURS_H
+#define GNUNET_SERVICE_TRANSPORT_NEIGHBOURS_H
+
+#include "gnunet_statistics_service.h"
+#include "gnunet_transport_service.h"
+#include "gnunet_transport_plugin.h"
+#include "gnunet_util_lib.h"
+
+// TODO:
+// - ATS and similar info is a bit lacking in the API right now...
+
+
+
+/**
+ * Initialize the neighbours subsystem.
+ *
+ * @param cls closure for callbacks
+ * @param connect_cb function to call if we connect to a peer
+ * @param disconnect_cb function to call if we disconnect from a peer
+ */
+void
+GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
+                      GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb);
+
+
+/**
+ * Cleanup the neighbours subsystem.
+ */
+void
+GST_neighbours_stop (void);
+
+
+/**
+ * Try to create a connection to the given target (eventually).
+ *
+ * @param target peer to try to connect to
+ */
+void
+GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target);
+
+
+/**
+ * Test if we're connected to the given peer.
+ *
+ * @param target peer to test
+ * @return GNUNET_YES if we are connected, GNUNET_NO if not
+ */
+int
+GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target);
+
+
+/**
+ * Function called after the transmission is done.
+ *
+ * @param cls closure
+ * @param success GNUNET_OK on success, GNUNET_NO on failure, GNUNET_SYSERR if we're not connected
+ */
+typedef void (*GST_NeighbourSendContinuation) (void *cls, int success);
+
+
+/**
+ * Transmit a message to the given target using the active connection.
+ *
+ * @param target destination
+ * @param msg message to send
+ * @param msg_size number of bytes in msg
+ * @param timeout when to fail with timeout
+ * @param cont function to call when done
+ * @param cont_cls closure for 'cont'
+ */
+void
+GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
+                     size_t msg_size, struct GNUNET_TIME_Relative timeout,
+                     GST_NeighbourSendContinuation cont, void *cont_cls);
+
+
+/**
+ * We have received a message from the given sender.
+ * How long should we delay before receiving more?
+ * (Also used to keep the peer marked as live).
+ *
+ * @param sender sender of the message
+ * @param size size of the message
+ * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
+ *                   GNUNET_NO if the neighbour is not connected or violates the quota
+ * @return how long to wait before reading more from this sender
+ */
+struct GNUNET_TIME_Relative
+GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
+                                        *sender, ssize_t size, int *do_forward);
+
+
+/**
+ * Keep the connection to the given neighbour alive longer,
+ * we received a KEEPALIVE (or equivalent).
+ *
+ * @param neighbour neighbour to keep alive
+ */
+void
+GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour);
+
+
+/**
+ * Change the incoming quota for the given peer.
+ *
+ * @param neighbour identity of peer to change qutoa for
+ * @param quota new quota
+ */
+void
+GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
+                                   struct GNUNET_BANDWIDTH_Value32NBO quota);
+
+
+/**
+ * If we have an active connection to the given target, it must be shutdown.
+ *
+ * @param target peer to disconnect from
+ */
+void
+GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target);
+
+
+/**
+ * Function called for each connected neighbour.
+ *
+ * @param cls closure
+ * @param neighbour identity of the neighbour
+ * @param ats performance data
+ * @param ats_count number of entries in ats (including 0-termination)
+ * @param transport plugin
+ * @param addr address
+ * @param addrlen address length
+ */
+typedef void (*GST_NeighbourIterator) (void *cls,
+                                       const struct GNUNET_PeerIdentity *
+                                       neighbour,
+                                       const struct
+                                       GNUNET_ATS_Information * ats,
+                                       uint32_t ats_count,
+                                       const char * transport,
+                                       const void * addr,
+                                       size_t addrlen);
+
+
+/**
+ * Iterate over all connected neighbours.
+ *
+ * @param cb function to call
+ * @param cb_cls closure for cb
+ */
+void
+GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls);
+
+
+/**
+ * A session was terminated. Take note.
+ *
+ * @param peer identity of the peer where the session died
+ * @param session session that is gone
+ */
+void
+GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
+                                   struct Session *session);
+
+
+/**
+ * For an existing neighbour record, set the active connection to
+ * use the given address.
+ *
+ * @param peer identity of the peer to switch the address for
+ * @param plugin_name name of transport that delivered the PONG
+ * @param address address of the other peer, NULL if other peer
+ *                       connected to us
+ * @param address_len number of bytes in address
+ * @param session session to use (or NULL)
+ * @param ats performance data
+ * @param ats_count number of entries in ats
+ * @param bandwidth_in inbound quota to be used when connection is up
+ * @param bandwidth_out outbound quota to be used when connection is up
+ * @return GNUNET_YES if we are currently connected, GNUNET_NO if the
+ *         connection is not up (yet)
+ */
+int
+GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
+                                  const char *plugin_name, const void *address,
+                                  size_t address_len, struct Session *session,
+                                  const struct GNUNET_ATS_Information
+                                  *ats, uint32_t ats_count,
+                                  struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
+                                  struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out);
+
+
+/**
+ * We received a 'SESSION_CONNECT' message from the other peer.
+ * Consider switching to it.
+ *
+ * @param message possibly a 'struct SessionConnectMessage' (check format)
+ * @param peer identity of the peer to switch the address for
+ * @param plugin_name name of transport that delivered the PONG
+ * @param address address of the other peer, NULL if other peer
+ *                       connected to us
+ * @param address_len number of bytes in address
+ * @param session session to use (or NULL)
+ * @param ats performance data
+ * @param ats_count number of entries in ats (excluding 0-termination)
+  */
+void
+GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
+                               const struct GNUNET_PeerIdentity *peer,
+                               const char *plugin_name,
+                               const char *sender_address, uint16_t sender_address_len,
+                               struct Session *session,
+                               const struct GNUNET_ATS_Information *ats,
+                               uint32_t ats_count);
+
+void
+GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
+                               const struct GNUNET_PeerIdentity *peer,
+                               const char *plugin_name,
+                               const char *sender_address, uint16_t sender_address_len,
+                               struct Session *session,
+                               const struct GNUNET_ATS_Information *ats,
+                               uint32_t ats_count);
+
+void
+GST_neighbours_handle_ack (const struct GNUNET_MessageHeader *message,
+    const struct GNUNET_PeerIdentity *peer,
+    const char *plugin_name,
+    const char *sender_address, uint16_t sender_address_len,
+    struct Session *session,
+    const struct GNUNET_ATS_Information *ats,
+    uint32_t ats_count);
+
+/**
+ * We received a disconnect message from the given peer,
+ * validate and process.
+ * 
+ * @param peer sender of the message
+ * @param msg the disconnect message
+ */
+void
+GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity *peer,
+                                          const struct GNUNET_MessageHeader *msg);
+
+
+#endif
+/* end of file gnunet-service-transport_neighbours.h */