diff options
Diffstat (limited to 'src/transport/plugin_transport_udp_broadcasting.c')
| -rw-r--r-- | src/transport/plugin_transport_udp_broadcasting.c | 522 |
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 0000000..e33af26 --- /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 */ |