summaryrefslogtreecommitdiff
path: root/src/transport/plugin_transport_udp_broadcasting.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/transport/plugin_transport_udp_broadcasting.c')
-rw-r--r--src/transport/plugin_transport_udp_broadcasting.c522
1 files changed, 522 insertions, 0 deletions
diff --git a/src/transport/plugin_transport_udp_broadcasting.c b/src/transport/plugin_transport_udp_broadcasting.c
new file mode 100644
index 000000000..e33af26be
--- /dev/null
+++ b/src/transport/plugin_transport_udp_broadcasting.c
@@ -0,0 +1,522 @@
+/*
+ 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.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;
+#if DEBUG_UDP_BROADCASTING
+ 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)));
+#endif
+ 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;
+#if DEBUG_UDP_BROADCASTING
+ 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)));
+#endif
+
+ 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);
+}
+
+void
+udp_broadcast_receive (struct Plugin *plugin, const char * buf, ssize_t size, struct sockaddr *addr, size_t addrlen)
+{
+ struct GNUNET_ATS_Information ats;
+
+ if (addrlen == sizeof (struct sockaddr_in))
+ {
+#if DEBUG_UDP_BROADCASTING
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received IPv4 HELLO beacon broadcast with %i bytes from address %s\n",
+ size, GNUNET_a2s ((const struct sockaddr *) addr, addrlen));
+#endif
+ struct Mstv4Context *mc;
+
+ mc = GNUNET_malloc (sizeof (struct Mstv4Context));
+ struct sockaddr_in *av4 = (struct sockaddr_in *) addr;
+
+ mc->addr.ipv4_addr = av4->sin_addr.s_addr;
+ mc->addr.u4_port = av4->sin_port;
+ ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
+ mc->ats_address_network_type = ats.value;
+ if (GNUNET_OK !=
+ GNUNET_SERVER_mst_receive (plugin->broadcast_ipv4_mst, mc, buf, size,
+ GNUNET_NO, GNUNET_NO))
+ GNUNET_free (mc);
+ }
+ else if (addrlen == sizeof (struct sockaddr_in6))
+ {
+#if DEBUG_UDP_BROADCASTING
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received IPv6 HELLO beacon broadcast with %i bytes from address %s\n",
+ size, GNUNET_a2s ((const struct sockaddr *) &addr, addrlen));
+#endif
+ struct Mstv6Context *mc;
+
+ mc = GNUNET_malloc (sizeof (struct Mstv6Context));
+ struct sockaddr_in6 *av6 = (struct sockaddr_in6 *) addr;
+
+ mc->addr.ipv6_addr = av6->sin6_addr;
+ mc->addr.u6_port = av6->sin6_port;
+ ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
+ mc->ats_address_network_type = ats.value;
+
+ if (GNUNET_OK !=
+ GNUNET_SERVER_mst_receive (plugin->broadcast_ipv6_mst, mc, buf, size,
+ GNUNET_NO, 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
+ {
+#if DEBUG_UDP_BROADCASTING
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Sent HELLO beacon broadcast with %i bytes to address %s\n", sent,
+ GNUNET_a2s (baddr->addr, baddr->addrlen));
+#endif
+ }
+ 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
+ {
+#if DEBUG_UDP_BROADCASTING
+ 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)));
+#endif
+ }
+
+
+ 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)
+ {
+#if DEBUG_UDP_BROADCASTING
+ 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);
+#endif
+
+ /* 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 */