- new udp implementation: start and stop

1 files changed, 463 insertions, 0 deletions

diff --git a/src/transport/plugin_transport_udp_new_broadcasting.c b/src/transport/plugin_transport_udp_new_broadcasting.c
new file mode 100644
index 000000000..7513cb626
--- /dev/null
+++ b/src/transport/plugin_transport_udp_new_broadcasting.c
@@ -0,0 +1,463 @@
+/*
+     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/plugin_transport_udp_broadcasting.c
+ * @brief Neighbour discovery with UDP
+ * @author Christian Grothoff
+ * @author Matthias Wachs
+ */
+#include "platform.h"
+#include "plugin_transport_udp_new.h"
+#include "gnunet_hello_lib.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_fragmentation_lib.h"
+#include "gnunet_nat_lib.h"
+#include "gnunet_protocols.h"
+#include "gnunet_resolver_service.h"
+#include "gnunet_signatures.h"
+#include "gnunet_constants.h"
+#include "gnunet_statistics_service.h"
+#include "gnunet_transport_service.h"
+#include "gnunet_transport_plugin.h"
+#include "transport.h"
+
+#define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
+
+
+struct UDP_Beacon_Message
+{
+ /**
+  * Message header.
+  */
+  struct GNUNET_MessageHeader header;
+
+ /**
+  * What is the identity of the sender
+  */
+  struct GNUNET_PeerIdentity sender;
+};
+
+
+struct BroadcastAddress
+{
+  struct BroadcastAddress *next;
+  struct BroadcastAddress *prev;
+
+  void *addr;
+  socklen_t addrlen;
+};
+
+
+struct Mstv4Context
+{
+  struct Plugin *plugin;
+
+  struct IPv4UdpAddress addr;
+  /**
+   * ATS network type in NBO
+   */
+  uint32_t ats_address_network_type;
+};
+
+struct Mstv6Context
+{
+  struct Plugin *plugin;
+
+  struct IPv6UdpAddress addr;
+  /**
+   * ATS network type in NBO
+   */
+  uint32_t ats_address_network_type;
+};
+
+
+
+void
+broadcast_ipv6_mst_cb (void *cls, void *client,
+                       const struct GNUNET_MessageHeader *message)
+{
+
+  struct Plugin *plugin = cls;
+  struct Mstv6Context *mc = client;
+  const struct GNUNET_MessageHeader *hello;
+  struct UDP_Beacon_Message *msg;
+
+  msg = (struct UDP_Beacon_Message *) message;
+
+  if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
+      ntohs (msg->header.type))
+    return;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Received beacon with %u bytes from peer `%s' via address `%s'\n",
+       ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
+       udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
+
+  struct GNUNET_ATS_Information atsi[2];
+
+  /* setup ATS */
+  atsi[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
+  atsi[0].value = htonl (1);
+  atsi[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
+  atsi[1].value = mc->ats_address_network_type;
+  GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
+
+  hello = (struct GNUNET_MessageHeader *) &msg[1];
+  plugin->env->receive (plugin->env->cls, &msg->sender, hello,
+                        (const struct GNUNET_ATS_Information *) &atsi, 2, NULL,
+                        (const char *) &mc->addr, sizeof (mc->addr));
+
+  GNUNET_STATISTICS_update (plugin->env->stats,
+                            _
+                            ("# IPv6 multicast HELLO beacons received via udp"),
+                            1, GNUNET_NO);
+  GNUNET_free (mc);
+}
+
+void
+broadcast_ipv4_mst_cb (void *cls, void *client,
+                       const struct GNUNET_MessageHeader *message)
+{
+  struct Plugin *plugin = cls;
+  struct Mstv4Context *mc = client;
+  const struct GNUNET_MessageHeader *hello;
+  struct UDP_Beacon_Message *msg;
+
+  msg = (struct UDP_Beacon_Message *) message;
+
+  if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
+      ntohs (msg->header.type))
+    return;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Received beacon with %u bytes from peer `%s' via address `%s'\n",
+       ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
+       udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
+
+  struct GNUNET_ATS_Information atsi[2];
+
+  /* setup ATS */
+  atsi[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
+  atsi[0].value = htonl (1);
+  atsi[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
+  atsi[1].value = mc->ats_address_network_type;
+  GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
+
+  hello = (struct GNUNET_MessageHeader *) &msg[1];
+  plugin->env->receive (plugin->env->cls, &msg->sender, hello,
+                        (const struct GNUNET_ATS_Information *) &atsi, 2, NULL,
+                        (const char *) &mc->addr, sizeof (mc->addr));
+
+  GNUNET_STATISTICS_update (plugin->env->stats,
+                            _
+                            ("# IPv4 broadcast HELLO beacons received via udp"),
+                            1, GNUNET_NO);
+  GNUNET_free (mc);
+}
+
+static void
+udp_ipv4_broadcast_send (void *cls,
+                         const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct Plugin *plugin = cls;
+  int sent;
+  uint16_t msg_size;
+  uint16_t hello_size;
+  char buf[65536];
+
+  const struct GNUNET_MessageHeader *hello;
+  struct UDP_Beacon_Message *msg;
+  struct BroadcastAddress *baddr;
+
+  plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
+
+  hello = plugin->env->get_our_hello ();
+  hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
+  msg_size = hello_size + sizeof (struct UDP_Beacon_Message);
+
+  if (hello_size < (sizeof (struct GNUNET_MessageHeader)) ||
+      (msg_size > (UDP_MTU)))
+    return;
+
+  msg = (struct UDP_Beacon_Message *) buf;
+  msg->sender = *(plugin->env->my_identity);
+  msg->header.size = ntohs (msg_size);
+  msg->header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON);
+  memcpy (&msg[1], hello, hello_size);
+  sent = 0;
+
+  baddr = plugin->ipv4_broadcast_head;
+  /* just IPv4 */
+  while ((baddr != NULL) && (baddr->addrlen == sizeof (struct sockaddr_in)))
+  {
+    struct sockaddr_in *addr = (struct sockaddr_in *) baddr->addr;
+
+    addr->sin_port = htons (plugin->port);
+
+    sent =
+        GNUNET_NETWORK_socket_sendto (plugin->sockv4, msg, msg_size,
+                                      (const struct sockaddr *) addr,
+                                      baddr->addrlen);
+    if (sent == GNUNET_SYSERR)
+      GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
+    else
+      LOG (GNUNET_ERROR_TYPE_DEBUG,
+           "Sent HELLO beacon broadcast with  %i bytes to address %s\n", sent,
+           GNUNET_a2s (baddr->addr, baddr->addrlen));
+    baddr = baddr->next;
+  }
+
+  plugin->send_ipv4_broadcast_task =
+      GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
+                                    &udp_ipv4_broadcast_send, plugin);
+}
+
+static void
+udp_ipv6_broadcast_send (void *cls,
+                         const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct Plugin *plugin = cls;
+  int sent;
+  uint16_t msg_size;
+  uint16_t hello_size;
+  char buf[65536];
+
+  const struct GNUNET_MessageHeader *hello;
+  struct UDP_Beacon_Message *msg;
+
+  plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
+
+  hello = plugin->env->get_our_hello ();
+  hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
+  msg_size = hello_size + sizeof (struct UDP_Beacon_Message);
+
+  if (hello_size < (sizeof (struct GNUNET_MessageHeader)) ||
+      (msg_size > (UDP_MTU)))
+    return;
+
+  msg = (struct UDP_Beacon_Message *) buf;
+  msg->sender = *(plugin->env->my_identity);
+  msg->header.size = ntohs (msg_size);
+  msg->header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON);
+  memcpy (&msg[1], hello, hello_size);
+  sent = 0;
+
+  sent =
+      GNUNET_NETWORK_socket_sendto (plugin->sockv6, msg, msg_size,
+                                    (const struct sockaddr *)
+                                    &plugin->ipv6_multicast_address,
+                                    sizeof (struct sockaddr_in6));
+  if (sent == GNUNET_SYSERR)
+    GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
+  else
+    LOG (GNUNET_ERROR_TYPE_DEBUG,
+         "Sending IPv6 HELLO beacon broadcast with  %i bytes to address %s\n",
+         sent,
+         GNUNET_a2s ((const struct sockaddr *) &plugin->ipv6_multicast_address,
+                     sizeof (struct sockaddr_in6)));
+
+
+
+  plugin->send_ipv6_broadcast_task =
+      GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
+                                    &udp_ipv6_broadcast_send, plugin);
+}
+
+
+static int
+iface_proc (void *cls, const char *name, int isDefault,
+            const struct sockaddr *addr, const struct sockaddr *broadcast_addr,
+            const struct sockaddr *netmask, socklen_t addrlen)
+{
+  struct Plugin *plugin = cls;
+
+  if (addr != NULL)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "address %s for interface %s %p\n ",
+                GNUNET_a2s (addr, addrlen), name, addr);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "broadcast address %s for interface %s %p\n ",
+                GNUNET_a2s (broadcast_addr, addrlen), name, broadcast_addr);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "netmask %s for interface %s %p\n ",
+                GNUNET_a2s (netmask, addrlen), name, netmask);
+
+
+    /* Collecting broadcast addresses */
+    if (broadcast_addr != NULL)
+    {
+      struct BroadcastAddress *ba =
+          GNUNET_malloc (sizeof (struct BroadcastAddress));
+      ba->addr = GNUNET_malloc (addrlen);
+      memcpy (ba->addr, broadcast_addr, addrlen);
+      ba->addrlen = addrlen;
+      GNUNET_CONTAINER_DLL_insert (plugin->ipv4_broadcast_head,
+                                   plugin->ipv4_broadcast_tail, ba);
+    }
+  }
+  return GNUNET_OK;
+}
+
+
+void
+setup_broadcast (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
+{
+  /* create IPv4 broadcast socket */
+  plugin->broadcast_ipv4 = GNUNET_NO;
+  if (plugin->sockv4 != NULL)
+  {
+    int yes = 1;
+
+    if (GNUNET_NETWORK_socket_setsockopt
+        (plugin->sockv4, SOL_SOCKET, SO_BROADCAST, &yes,
+         sizeof (int)) != GNUNET_OK)
+    {
+      LOG (GNUNET_ERROR_TYPE_WARNING,
+           _
+           ("Failed to set IPv4 broadcast option for broadcast socket on port %d\n"),
+           ntohs (serverAddrv4->sin_port));
+    }
+    else
+    {
+      GNUNET_OS_network_interfaces_list (iface_proc, plugin);
+      plugin->send_ipv4_broadcast_task =
+          GNUNET_SCHEDULER_add_now (&udp_ipv4_broadcast_send, plugin);
+
+      plugin->broadcast_ipv4_mst =
+          GNUNET_SERVER_mst_create (broadcast_ipv4_mst_cb, plugin);
+
+      LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Broadcasting running\n");
+      plugin->broadcast_ipv4 = GNUNET_YES;
+    }
+  }
+
+  plugin->broadcast_ipv6 = GNUNET_NO;
+  if (plugin->sockv6 != NULL)
+  {
+    memset (&plugin->ipv6_multicast_address, 0, sizeof (struct sockaddr_in6));
+    GNUNET_assert (1 ==
+                   inet_pton (AF_INET6, "FF05::13B",
+                              &plugin->ipv6_multicast_address.sin6_addr));
+
+    plugin->ipv6_multicast_address.sin6_family = AF_INET6;
+    plugin->ipv6_multicast_address.sin6_port = htons (plugin->port);
+
+    plugin->broadcast_ipv6_mst =
+        GNUNET_SERVER_mst_create (broadcast_ipv6_mst_cb, plugin);
+
+    /* Create IPv6 multicast request */
+    struct ipv6_mreq multicastRequest;
+
+    multicastRequest.ipv6mr_multiaddr =
+        plugin->ipv6_multicast_address.sin6_addr;
+    /* TODO: 0 selects the "best" interface, tweak to use all interfaces
+     *
+     * http://tools.ietf.org/html/rfc2553#section-5.2:
+     *
+     * IPV6_JOIN_GROUP
+     *
+     * Join a multicast group on a specified local interface.  If the
+     * interface index is specified as 0, the kernel chooses the local
+     * interface.  For example, some kernels look up the multicast
+     * group in the normal IPv6 routing table and using the resulting
+     * interface.
+     * */
+    multicastRequest.ipv6mr_interface = 0;
+
+    /* Join the multicast group */
+    if (GNUNET_NETWORK_socket_setsockopt
+        (plugin->sockv6, IPPROTO_IPV6, IPV6_JOIN_GROUP,
+         (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
+    {
+      LOG (GNUNET_ERROR_TYPE_WARNING,
+      "Failed to join IPv6 multicast group: IPv6 broadcasting not running\n");
+    }
+    else
+    {
+#if DEBUG_UDP
+      LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 broadcasting running\n");
+#endif
+      plugin->send_ipv6_broadcast_task =
+          GNUNET_SCHEDULER_add_now (&udp_ipv6_broadcast_send, plugin);
+      plugin->broadcast_ipv6 = GNUNET_YES;
+    }
+  }
+}
+
+void
+stop_broadcast (struct Plugin *plugin)
+{
+  if (plugin->broadcast_ipv4)
+  {
+    if (plugin->send_ipv4_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
+    {
+      GNUNET_SCHEDULER_cancel (plugin->send_ipv4_broadcast_task);
+      plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
+    }
+
+    if (plugin->broadcast_ipv4_mst != NULL)
+      GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv4_mst);
+
+    while (plugin->ipv4_broadcast_head != NULL)
+    {
+      struct BroadcastAddress *p = plugin->ipv4_broadcast_head;
+
+      GNUNET_CONTAINER_DLL_remove (plugin->ipv4_broadcast_head,
+                                   plugin->ipv4_broadcast_tail, p);
+      GNUNET_free (p->addr);
+      GNUNET_free (p);
+    }
+  }
+
+  if (plugin->broadcast_ipv6)
+  {
+    /* Create IPv6 multicast request */
+    struct ipv6_mreq multicastRequest;
+
+    multicastRequest.ipv6mr_multiaddr =
+        plugin->ipv6_multicast_address.sin6_addr;
+    multicastRequest.ipv6mr_interface = 0;
+
+    /* Join the multicast address */
+    if (GNUNET_NETWORK_socket_setsockopt
+        (plugin->sockv6, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
+        (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
+    {
+       GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, setsockopt);
+    }
+    else
+    {
+#if DEBUG_UDP
+      LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 Broadcasting stopped\n");
+#endif
+    }
+
+    if (plugin->send_ipv6_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
+    {
+      GNUNET_SCHEDULER_cancel (plugin->send_ipv6_broadcast_task);
+      plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
+    }
+    if (plugin->broadcast_ipv6_mst != NULL)
+      GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv6_mst);
+  }
+
+}
+
+/* end of plugin_transport_udp_broadcasting.c */