Imported Upstream version 0.9.2upstream/0.9.2

1 files changed, 633 insertions, 0 deletions

diff --git a/src/transport/gnunet-service-transport.c b/src/transport/gnunet-service-transport.c
new file mode 100644
index 0000000..cd9bb5c
--- /dev/null
+++ b/src/transport/gnunet-service-transport.c
@@ -0,0 +1,633 @@
+/*
+     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.c
+ * @brief
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_hello_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 address the address
+ */
+static void
+transmit_our_hello (void *cls, const struct GNUNET_PeerIdentity *target,
+                    const struct GNUNET_ATS_Information *ats,
+                    uint32_t ats_count,
+                    const struct GNUNET_HELLO_Address *address)
+{
+  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 address the address
+ * @param session session used
+ * @param message the message to process
+ * @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_HELLO_Address *address,
+                 struct Session *session,
+                 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 msg_size = ntohs (message->size);
+  size_t size =
+      sizeof (struct InboundMessage) + msg_size +
+      sizeof (struct GNUNET_ATS_Information) * (ats_count + 1);
+  char buf[size];
+  struct GNUNET_ATS_Information *ap;
+
+  ret = GNUNET_TIME_UNIT_ZERO;
+  do_forward = GNUNET_SYSERR;
+  ret = GST_neighbours_calculate_receive_delay (peer, msg_size, &do_forward);
+
+  if (!GST_neighbours_test_connected (peer))
+  {
+
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Discarded %u bytes type %u payload from peer `%s'\n", msg_size,
+                ntohs (message->type), GNUNET_i2s (peer));
+
+    GNUNET_STATISTICS_update (GST_stats,
+                              gettext_noop
+                              ("# bytes payload discarded due to not connected peer "),
+                              msg_size, GNUNET_NO);
+    return ret;
+  }
+
+  if (do_forward != GNUNET_YES)
+    return ret;
+  im = (struct InboundMessage *) buf;
+  im->header.size = htons (size);
+  im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
+  im->ats_count = htonl (ats_count + 1);
+  im->peer = *peer;
+  ap = (struct GNUNET_ATS_Information *) &im[1];
+  memcpy (ap, ats, ats_count * sizeof (struct GNUNET_ATS_Information));
+  ap[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
+  ap[ats_count].value =
+      htonl ((uint32_t) GST_neighbour_get_latency (peer).rel_value);
+  memcpy (&ap[ats_count + 1], message, ntohs (message->size));
+
+  GNUNET_ATS_address_update (GST_ats, address, session, ap, ats_count + 1);
+  GST_clients_broadcast (&im->header, GNUNET_YES);
+
+  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;
+  struct GNUNET_HELLO_Address address;
+  uint16_t type;
+
+  address.peer = *peer;
+  address.address = sender_address;
+  address.address_length = sender_address_len;
+  address.transport_name = plugin_name;
+  ret = GNUNET_TIME_UNIT_ZERO;
+  if (NULL == message)
+    goto end;
+  type = ntohs (message->type);
+#if DEBUG_TRANSPORT
+
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "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 (&address) : "<inbound>");
+#endif
+    GST_validation_handle_ping (peer, message, &address, session);
+    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 (&address) : "<inbound>");
+#endif
+    GST_validation_handle_pong (peer, message);
+    break;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT:
+    GST_neighbours_handle_connect (message, peer, &address, session, ats,
+                                   ats_count);
+    break;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK:
+    GST_neighbours_handle_connect_ack (message, peer, &address, session, ats,
+                                       ats_count);
+    break;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK:
+    GST_neighbours_handle_ack (message, peer, &address, 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;
+  case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE:
+    GST_neighbours_keepalive_response (peer, ats, ats_count);
+    break;
+  default:
+    /* should be payload */
+    ret = process_payload (peer, &address, session, 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, &address, 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;
+  struct GNUNET_HELLO_Address address;
+
+  address.peer = GST_my_identity;
+  address.transport_name = plugin_name;
+  address.address = addr;
+  address.address_length = addrlen;
+  GST_hello_modify_addresses (add_remove, &address);
+}
+
+
+/**
+ * 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)
+{
+  const char *transport_name = cls;
+  struct GNUNET_HELLO_Address address;
+
+  GNUNET_assert (strlen (transport_name) > 0);
+#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));
+  address.peer = *peer;
+  address.address = NULL;
+  address.address_length = 0;
+  address.transport_name = transport_name;
+  GST_neighbours_session_terminated (peer, session);
+  GNUNET_ATS_address_destroyed (GST_ats, &address, session);
+}
+
+
+/**
+ * Function that will be called to figure if an address is an loopback,
+ * LAN, WAN etc. address
+ *
+ * @param cls closure
+ * @param addr binary address
+ * @param addrlen length of the address
+ * @return ATS Information containing the network type
+ */
+static const struct GNUNET_ATS_Information
+plugin_env_address_to_type (void *cls,
+                            const struct sockaddr *addr,
+                            size_t addrlen)
+{
+  struct GNUNET_ATS_Information ats;
+  ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
+  ats.value = htonl (GNUNET_ATS_NET_UNSPECIFIED);
+  if (GST_ats == NULL)
+  {
+    GNUNET_break (0);
+    return ats;
+  }
+  if (((addr->sa_family != AF_INET) && (addrlen != sizeof (struct sockaddr_in))) &&
+      ((addr->sa_family != AF_INET6) && (addrlen != sizeof (struct sockaddr_in6))) &&
+      (addr->sa_family != AF_UNIX))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Malformed address with length %u `%s'\n",
+                addrlen,
+                GNUNET_a2s(addr, addrlen));
+    GNUNET_break (0);
+    return (const struct GNUNET_ATS_Information) ats;
+  }
+  return GNUNET_ATS_address_get_type(GST_ats, addr, addrlen);
+}
+
+
+/**
+ * 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 address address to use (for peer given in address)
+ * @param session session to use (if available)
+ * @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
+ * @param ats ATS information
+ * @param ats_count number of ATS elements
+ */
+static void
+ats_request_address_change (void *cls,
+                            const struct GNUNET_HELLO_Address *address,
+                            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 (&address->peer));
+#endif
+    GST_neighbours_force_disconnect (&address->peer);
+    return;
+  }
+  /* will never return GNUNET_YES since connection is to be established */
+  GST_neighbours_switch_to_address (&address->peer, address, 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 to notify transport users that a neighbour peer changed its
+ * active address.
+ *
+ * @param cls closure
+ * @param peer peer this update is about (never NULL)
+ * @param address address, NULL on disconnect
+ */
+static void
+neighbours_address_notification (void *cls,
+                                 const struct GNUNET_PeerIdentity *peer,
+                                 const struct GNUNET_HELLO_Address *address)
+{
+  GST_clients_broadcast_address_notification (peer, address);
+}
+
+
+/**
+ * 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_neighbours_stop ();
+  GST_validation_stop ();
+  GST_plugins_unload ();
+
+  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_ats =
+      GNUNET_ATS_scheduling_init (GST_cfg, &ats_request_address_change, NULL);
+  GST_plugins_load (&plugin_env_receive_callback,
+                    &plugin_env_address_change_notification,
+                    &plugin_env_session_end,
+                    &plugin_env_address_to_type);
+  GST_neighbours_start (NULL,
+                        &neighbours_connect_notification,
+                        &neighbours_disconnect_notification,
+                        &neighbours_address_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 */