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[GNUnet-SVN] r17664 - gnunet/src/transport
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From: |
gnunet |
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Subject: |
[GNUnet-SVN] r17664 - gnunet/src/transport |
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Date: |
Fri, 21 Oct 2011 23:53:56 +0200 |
Author: wachs
Date: 2011-10-21 23:53:56 +0200 (Fri, 21 Oct 2011)
New Revision: 17664
Added:
gnunet/src/transport/plugin_transport_udp_new.c
Log:
concept for new completely session based udp plugin
old plugin required too many dirty hacks to pass required data around
Added: gnunet/src/transport/plugin_transport_udp_new.c
===================================================================
--- gnunet/src/transport/plugin_transport_udp_new.c
(rev 0)
+++ gnunet/src/transport/plugin_transport_udp_new.c 2011-10-21 21:53:56 UTC
(rev 17664)
@@ -0,0 +1,1449 @@
+/*
+ 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.c
+ * @brief Implementation of the UDP NAT punching
+ * transport service
+ * @author Christian Grothoff
+ * @author Nathan Evans
+ */
+#include "platform.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__)
+
+
+#define DEBUG_UDP GNUNET_EXTRA_LOGGING
+
+/**
+ * MTU for fragmentation subsystem. Should be conservative since
+ * all communicating peers MUST work with this MTU.
+ */
+#define UDP_MTU 1400
+
+/**
+ * Number of messages we can defragment in parallel. We only really
+ * defragment 1 message at a time, but if messages get re-ordered, we
+ * may want to keep knowledge about the previous message to avoid
+ * discarding the current message in favor of a single fragment of a
+ * previous message. 3 should be good since we don't expect massive
+ * message reorderings with UDP.
+ */
+#define UDP_MAX_MESSAGES_IN_DEFRAG 3
+
+/**
+ * We keep a defragmentation queue per sender address. How many
+ * sender addresses do we support at the same time? Memory consumption
+ * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this
+ * value. (So 128 corresponds to 12 MB and should suffice for
+ * connecting to roughly 128 peers via UDP).
+ */
+#define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
+
+
+/**
+ * UDP Message-Packet header (after defragmentation).
+ */
+struct UDPMessage
+{
+ /**
+ * Message header.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Always zero for now.
+ */
+ uint32_t reserved;
+
+ /**
+ * What is the identity of the sender
+ */
+ struct GNUNET_PeerIdentity sender;
+
+};
+
+
+/**
+ * UDP ACK Message-Packet header (after defragmentation).
+ */
+struct UDP_ACK_Message
+{
+ /**
+ * Message header.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Desired delay for flow control
+ */
+ uint32_t delay;
+
+ /**
+ * What is the identity of the sender
+ */
+ struct GNUNET_PeerIdentity sender;
+};
+
+
+/**
+ * Network format for IPv4 addresses.
+ */
+struct IPv4UdpAddress
+{
+ /**
+ * IPv4 address, in network byte order.
+ */
+ uint32_t ipv4_addr GNUNET_PACKED;
+
+ /**
+ * Port number, in network byte order.
+ */
+ uint16_t u4_port GNUNET_PACKED;
+};
+
+
+/**
+ * Network format for IPv6 addresses.
+ */
+struct IPv6UdpAddress
+{
+
+ /**
+ * IPv6 address.
+ */
+ struct in6_addr ipv6_addr GNUNET_PACKED;
+
+ /**
+ * Port number, in network byte order.
+ */
+ uint16_t u6_port GNUNET_PACKED;
+};
+
+
+/* Forward definition */
+struct Plugin;
+
+
+/**
+ * Session with another peer. FIXME: why not make this into
+ * a regular 'struct Session' and pass it around!?
+ */
+struct Session
+{
+
+ /**
+ * Which peer is this session for or from?
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * Pointer to the global plugin struct.
+ */
+ struct Plugin *plugin;
+
+ /**
+ * Address of the other peer
+ */
+ const struct sockaddr *sock_addr;
+
+ size_t addrlen;
+
+ /**
+ * Function to call upon completion of the transmission.
+ */
+ GNUNET_TRANSPORT_TransmitContinuation cont;
+
+ /**
+ * Closure for 'cont'.
+ */
+ void *cont_cls;
+
+ /**
+ * Current outgoing message to this peer.
+ */
+ struct GNUNET_FRAGMENT_Context *frag;
+
+ /*
+ * Is this a reliable, bidirectional connection?
+ * YES if we already received a message with this session
+ */
+ int bidirectional;
+
+ /*
+ * Task invalidating this session if idle
+ */
+ GNUNET_SCHEDULER_TaskIdentifier invalidation_task;
+
+ /*
+ * Desired delay for next sending we send to other peer
+ */
+ struct GNUNET_TIME_Relative flow_delay_for_other_peer;
+
+ /*
+ * Desired delay for next sending we received from other peer
+ */
+ struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
+};
+
+/**
+ * Encapsulation of all of the state of the plugin.
+ */
+struct Plugin
+{
+
+ /**
+ * Our environment.
+ */
+ struct GNUNET_TRANSPORT_PluginEnvironment *env;
+
+ /**
+ * Session of peers with whom we are currently connected,
+ * map of peer identity to 'struct PeerSession'.
+ */
+ struct GNUNET_CONTAINER_MultiHashMap *sessions;
+
+ /**
+ * Heap with all of our defragmentation activities.
+ */
+ struct GNUNET_CONTAINER_Heap *defrags;
+
+ /**
+ * ID of select task
+ */
+ GNUNET_SCHEDULER_TaskIdentifier select_task;
+
+ /**
+ * Tokenizer for inbound messages.
+ */
+ struct GNUNET_SERVER_MessageStreamTokenizer *mst;
+
+ /**
+ * Bandwidth tracker to limit global UDP traffic.
+ */
+ struct GNUNET_BANDWIDTH_Tracker tracker;
+
+ /**
+ * Address we were told to bind to exclusively (IPv4).
+ */
+ char *bind4_address;
+
+ /**
+ * Address we were told to bind to exclusively (IPv6).
+ */
+ char *bind6_address;
+
+ /**
+ * Handle to NAT traversal support.
+ */
+ struct GNUNET_NAT_Handle *nat;
+
+ /**
+ * FD Read set
+ */
+ struct GNUNET_NETWORK_FDSet *rs;
+
+ /**
+ * The read socket for IPv4
+ */
+ struct GNUNET_NETWORK_Handle *sockv4;
+
+ /**
+ * The read socket for IPv6
+ */
+ struct GNUNET_NETWORK_Handle *sockv6;
+
+ /**
+ * expected delay for ACKs
+ */
+ struct GNUNET_TIME_Relative last_expected_delay;
+
+ /**
+ * Port we listen on.
+ */
+ uint16_t port;
+
+ /**
+ * Port we advertise on.
+ */
+ uint16_t aport;
+
+};
+
+int delete_session_iterator (void *cls,
+ const GNUNET_HashCode * key,
+ void *value)
+{
+ struct Session *s = (struct Session *) value;
+ if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel(s->invalidation_task);
+ s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_CONTAINER_multihashmap_remove(s->plugin->sessions, key, s);
+
+ GNUNET_free (s);
+ return GNUNET_YES;
+}
+/**
+ * Disconnect from a remote node. Clean up session if we have one for this
peer
+ *
+ * @param cls closure for this call (should be handle to Plugin)
+ * @param target the peeridentity of the peer to disconnect
+ * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
+ */
+static void
+udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
+{
+ struct Plugin *plugin = cls;
+
+ GNUNET_CONTAINER_multihashmap_get_multiple(plugin, &target->hashPubKey,
&delete_session_iterator, NULL);
+
+}
+
+
+/**
+ * Actually send out the message.
+ *
+ * @param plugin the plugin
+ * @param sa the address to send the message to
+ * @param msg message to transmit
+ * @return the number of bytes written
+ */
+static ssize_t
+udp_send (struct Plugin *plugin, const struct sockaddr *sa,
+ const struct GNUNET_MessageHeader *msg)
+{
+ ssize_t sent;
+ size_t slen;
+
+ switch (sa->sa_family)
+ {
+ case AF_INET:
+ if (NULL == plugin->sockv4)
+ return 0;
+ sent =
+ GNUNET_NETWORK_socket_sendto (plugin->sockv4, msg, ntohs (msg->size),
+ sa, slen = sizeof (struct sockaddr_in));
+ break;
+ case AF_INET6:
+ if (NULL == plugin->sockv6)
+ return 0;
+ sent =
+ GNUNET_NETWORK_socket_sendto (plugin->sockv6, msg, ntohs (msg->size),
+ sa, slen = sizeof (struct sockaddr_in6));
+ break;
+ default:
+ GNUNET_break (0);
+ return 0;
+ }
+ if (GNUNET_SYSERR == sent)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ "UDP transmited %u-byte message to %s (%d: %s)\n",
+ (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen),
+ (int) sent, (sent < 0) ? STRERROR (errno) : "ok");
+
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP transmited %u-byte message to %s (%d: %s)\n",
+ (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen),
+ (int) sent, (sent < 0) ? STRERROR (errno) : "ok");
+ return sent;
+}
+
+
+static struct Session *
+create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity
*target,
+ const void *addr, size_t addrlen,
+ GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
+{
+ struct Session * s;
+ const struct IPv4UdpAddress *t4;
+ const struct IPv6UdpAddress *t6;
+ struct sockaddr_in *v4;
+ struct sockaddr_in6 *v6;
+ size_t len;
+
+ switch (addrlen)
+ {
+ case sizeof (struct IPv4UdpAddress):
+ if (NULL == plugin->sockv4)
+ {
+ return NULL;
+ }
+ t4 = addr;
+ s =
+ GNUNET_malloc (sizeof (struct Session) +
+ sizeof (struct sockaddr_in));
+ len = sizeof (struct sockaddr_in);
+ v4 = (struct sockaddr_in *) &s[1];
+ v4->sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v4->sin_len = sizeof (struct sockaddr_in);
+#endif
+ v4->sin_port = t4->u4_port;
+ v4->sin_addr.s_addr = t4->ipv4_addr;
+ break;
+ case sizeof (struct IPv6UdpAddress):
+ if (NULL == plugin->sockv6)
+ {
+ return NULL;
+ }
+ t6 = addr;
+ s =
+ GNUNET_malloc (sizeof (struct Session) +
+ sizeof (struct sockaddr_in6));
+ len = sizeof (struct sockaddr_in6);
+ v6 = (struct sockaddr_in6 *) &s[1];
+ v6->sin6_family = AF_INET6;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v6->sin6_len = sizeof (struct sockaddr_in6);
+#endif
+ v6->sin6_port = t6->u6_port;
+ v6->sin6_addr = t6->ipv6_addr;
+ break;
+ default:
+ /* Must have a valid address to send to */
+ GNUNET_break_op (0);
+ return NULL;
+ }
+
+ s->valid_until = GNUNET_TIME_absolute_get_zero ();
+ s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero ();
+ s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero ();
+ s->bidirectional = GNUNET_NO;
+ s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
+ s->addrlen = len;
+ s->target = *target;
+ s->plugin = plugin;
+ s->sock_addr = (const struct sockaddr *) &s[1];
+ s->cont = cont;
+ s->cont_cls = cont_cls;
+
+ return s;
+}
+
+static void
+invalidation_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Session * s = cls;
+ s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ "Session %X (`%s') is now invalid\n", s, GNUNET_a2s
(s->sock_addr,s->addrlen));
+
+ s->plugin->env->session_end(s->plugin->env->cls, &s->target, s);
+ GNUNET_assert (GNUNET_YES ==
GNUNET_CONTAINER_multihashmap_remove(s->plugin->sessions,
&s->target.hashPubKey, s));
+ GNUNET_free (s);
+}
+
+static const char *
+udp_address_to_string (void *cls, const void *addr, size_t addrlen);
+
+/**
+ * Function that is called with messages created by the fragmentation
+ * module. In the case of the 'proc' callback of the
+ * GNUNET_FRAGMENT_context_create function, this function must
+ * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
+ *
+ * @param cls closure, the 'struct PeerSession'
+ * @param msg the message that was created
+ */
+static void
+send_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
+{
+ struct Session *s = cls;
+
+ udp_send (session->plugin, session->sock_addr, msg);
+ GNUNET_FRAGMENT_context_transmission_done (session->frag);
+}
+
+/**
+ * Function that can be used by the transport service to transmit
+ * a message using the plugin.
+ *
+ * @param cls closure
+ * @param target who should receive this message (ignored by UDP)
+ * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
+ * @param msgbuf_size the size of the msgbuf to send
+ * @param priority how important is the message (ignored by UDP)
+ * @param timeout when should we time out (give up) if we can not transmit?
+ * @param session identifier used for this session (NULL for UDP)
+ * @param addr the addr to send the message to
+ * @param addrlen the len of addr
+ * @param force_address not used, we had better have an address to send to
+ * because we are stateless!!
+ * @param cont continuation to call once the message has
+ * been transmitted (or if the transport is ready
+ * for the next transmission call; or if the
+ * peer disconnected...)
+ * @param cont_cls closure for cont
+ *
+ * @return the number of bytes written (may return 0 and the message can
+ * still be transmitted later!)
+ */
+static ssize_t
+udp_plugin_send (void *cls, const struct GNUNET_PeerIdentity *target,
+ const char *msgbuf, size_t msgbuf_size, unsigned int priority,
+ struct GNUNET_TIME_Relative timeout, struct Session *session,
+ const void *addr, size_t addrlen, int force_address,
+ GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
+{
+ struct Plugin *plugin = cls;
+ struct Session *s;
+ const struct IPv4UdpAddress *t4;
+ const struct IPv6UdpAddress *t6;
+ size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
+ char mbuf[mlen];
+ struct UDPMessage *udp;
+
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP transmits %u-byte message to `%s' using address `%s' session 0x%X
mode %i\n",
+ msgbuf_size, GNUNET_i2s (target),
+ udp_address_to_string (NULL, addr, addrlen),
+ session, force_address);
+
+ /* no valid address given */
+ if ((addr = NULL) || (addrlen == 0))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ if (session != NULL)
+ {
+ s = find_session (target, addr, addrlen);
+ if (s != session)
+ {
+ /* found a conflicting session for this peer */
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ }
+ else
+ {
+ /* use a reliable transmission but no session given */
+ if (force_address == GNUNET_SYSERR)
+ return GNUNET_SYSERR;
+ /* create new session */
+ s = create_session(plugin, target, addr, addrlen, cont, cont_cls);
+ GNUNET_CONTAINER_multihashmap_put(plugin->sessions, &target->hashPubKey,
s, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
+ /* schedule invalidation task */
+ s->invalidation_task =
GNUNET_SCHEDULER_add_delayed(GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
&invalidation_task, NULL);
+ }
+
+ /* Message */
+ udp = (struct UDPMessage *) mbuf;
+ udp->header.size = htons (mlen);
+ udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
+ udp->reserved = htonl (0);
+ udp->sender = *plugin->env->my_identity;
+ memcpy (&udp[1], msgbuf, msgbuf_size);
+
+ struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get();
+ if (s->flow_delay_from_other_peer.abs_value > now.abs_value)
+ {
+ struct GNUNET_TIME_Relative delta =
GNUNET_TIME_absolute_get_difference(now, s->flow_delay_from_other_peer);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "We try to send to early! Should in %llu!\n",
delta.rel_value);
+ }
+ else
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "We can send!\n");
+
+
+ /* send without fragmentation */
+ if (mlen <= UDP_MTU)
+ {
+ mlen = udp_send (plugin, peer_session->sock_addr, &udp->header);
+ if (cont != NULL)
+ cont (cont_cls, target, (mlen > 0) ? GNUNET_OK : GNUNET_SYSERR);
+ GNUNET_free_non_null (peer_session);
+ }
+ /* send with fragmentation */
+ else
+ {
+ s->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats, UDP_MTU,
+ &plugin->tracker,
+ plugin->last_expected_delay,
+ &udp->header, &send_fragment,
+ s);
+ }
+ return mlen;
+}
+
+
+/**
+ * Message tokenizer has broken up an incomming message. Pass it on
+ * to the service.
+ *
+ * @param cls the 'struct Plugin'
+ * @param client the Session
+ * @param hdr the actual message
+ */
+static void
+process_inbound_tokenized_messages (void *cls, void *client,
+ const struct GNUNET_MessageHeader *hdr)
+{
+ struct Plugin *plugin = cls;
+ struct Session * s = client;
+ struct GNUNET_ATS_Information distance;
+ struct GNUNET_TIME_Relative delay;
+
+ /* setup ATS */
+ distance.type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
+ distance.value = htonl (1);
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Giving Session %X %s to transport\n", s->session,
GNUNET_i2s(&s->target));
+ delay = plugin->env->receive (plugin->env->cls, &s->target, hdr, &distance,
1, s,
+ // FIXME: USE UDP ADDRESSES!!!!
+ s->sock_addr, s->addrlen);
+ s->flow_delay_for_other_peer = delay;
+}
+
+
+/**
+ * We've received a UDP Message. Process it (pass contents to main service).
+ *
+ * @param plugin plugin context
+ * @param msg the message
+ * @param sender_addr sender address
+ * @param sender_addr_len number of bytes in sender_addr
+ */
+static void
+process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
+ const struct sockaddr *sender_addr,
+ socklen_t sender_addr_len)
+{
+ struct IPv4UdpAddress u4;
+ struct IPv6UdpAddress u6;
+ const void *arg;
+ size_t args;
+
+ if (0 != ntohl (msg->reserved))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ if (ntohs (msg->header.size) <
+ sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+
+ /* convert address */
+ switch (sender_addr->sa_family)
+ {
+ case AF_INET:
+ GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
+ u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
+ u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
+ arg = &u4;
+ args = sizeof (u4);
+ break;
+ case AF_INET6:
+ GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
+ u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
+ u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
+ arg = &u6;
+ args = sizeof (u6);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received message with %u bytes from peer `%s' at `%s'\n",
+ (unsigned int) ntohs (msg->header.size),
+ GNUNET_i2s (&msg->sender), GNUNET_a2s (sender_addr,
+ sender_addr_len));
+#endif
+
+ const struct UDPMessage * udp_msg = (const struct UDPMessage *) msg;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Lookup inbound UDP sessions for peer `%s' address `%s'\n",
+ GNUNET_i2s (&udp_msg->sender),
+ udp_address_to_string(NULL, arg, args));
+
+ /* create a session for inbound connections */
+ struct Session * s = NULL;
+ s = find_inbound_session (plugin, &udp_msg->sender, sender_addr,
sender_addr_len);
+
+ if (s != NULL)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Found existing inbound UDP sessions 0x%X for peer `%s'
address `%s'\n",
+ s,
+ GNUNET_i2s (&s->target),
+ udp_address_to_string(NULL, arg, args));
+ }
+ else
+ {
+ s = create_session (plugin, &udp_msg->sender, arg, args, NULL, NULL);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Creating inbound UDP sessions 0x%X for peer `%s' address
`%s'\n",
+ s,
+ GNUNET_i2s (&s->target),
+ udp_address_to_string(NULL, arg, args));
+
+ GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put
(plugin->sessions,
+ &s->target.hashPubKey,
+ s,
+
GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
+ }
+ s->valid_until = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(),
GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
+ if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel(s->invalidation_task);
+ s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Rescheduling %X' `%s'\n",
+ s, udp_address_to_string(NULL, arg, args));
+ }
+ s->invalidation_task =
GNUNET_SCHEDULER_add_delayed(GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
&invalidation_task, s);
+ /* we received from peer, so session is bidirectional and reliable */
+ s->bidirectional = GNUNET_YES;
+
+ GNUNET_SERVER_mst_receive (plugin->mst, &s, (const char *) &msg[1],
+ ntohs (msg->header.size) -
+ sizeof (struct UDPMessage), GNUNET_YES,
GNUNET_NO);
+}
+
+
+/**
+ * Read and process a message from the given socket.
+ *
+ * @param plugin the overall plugin
+ * @param rsock socket to read from
+ */
+static void
+udp_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
+{
+ socklen_t fromlen;
+ char addr[32];
+ char buf[65536];
+ ssize_t ret;
+ const struct GNUNET_MessageHeader *msg;
+ const struct GNUNET_MessageHeader *ack;
+ struct Session *peer_session;
+ const struct UDP_ACK_Message *udp_ack;
+ struct ReceiveContext *rc;
+ struct GNUNET_TIME_Absolute now;
+ struct FindReceiveContext frc;
+ struct Session * s = NULL;
+ struct GNUNET_TIME_Relative flow_delay;
+
+ fromlen = sizeof (addr);
+ memset (&addr, 0, sizeof (addr));
+ ret =
+ GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
+ (struct sockaddr *) &addr, &fromlen);
+ if (ret < sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ msg = (const struct GNUNET_MessageHeader *) buf;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP received %u-byte message from `%s' type %i\n", (unsigned
int) ret,
+ GNUNET_a2s ((const struct sockaddr *) addr, fromlen),
ntohs(msg->type));
+
+ if (ret != ntohs (msg->size))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+
+ switch (ntohs (msg->type))
+ {
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
+ if (ntohs (msg->size) < sizeof (struct UDPMessage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ process_udp_message (plugin, (const struct UDPMessage *) msg,
+ (const struct sockaddr *) addr, fromlen);
+ return;
+
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
+ if (ntohs (msg->size) <
+ sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ udp_ack = (const struct UDP_ACK_Message *) msg;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
+ (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp->sender),
+ GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
+
+ // TODO Guess a session from address, give it defragmenter and check in
process_udp if guess was right
+ s = guess_session (plugin->sessions, addr, addrlen);
+ if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (peer_session->frag, ack))
+ // ... other stuff
+ return;
+
+ case GNUNET_MESSAGE_TYPE_FRAGMENT:
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP processes %u-byte fragment from `%s'\n",
+ (unsigned int) ntohs (msg->size),
+ GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
+ // TODO Guess a session from address, give it defragmenter and check in
process_udp if guess was right
+ s = guess_session (plugin->sessions, addr, addrlen);
+ if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (rc->defrag, msg))
+ // other stuff
+ return;
+ default:
+ GNUNET_break_op (0);
+ return;
+ }
+}
+
+
+/**
+ * We have been notified that our writeset has something to read. We don't
+ * know which socket needs to be read, so we have to check each one
+ * Then reschedule this function to be called again once more is available.
+ *
+ * @param cls the plugin handle
+ * @param tc the scheduling context (for rescheduling this function again)
+ */
+static void
+udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Plugin *plugin = cls;
+
+ plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ return;
+ if ((NULL != plugin->sockv4) &&
+ (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
+ udp_read (plugin, plugin->sockv4);
+ if ((NULL != plugin->sockv6) &&
+ (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
+ udp_read (plugin, plugin->sockv6);
+ plugin->select_task =
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
+ NULL, &udp_plugin_select, plugin);
+
+}
+
+
+/**
+ * Check if the given port is plausible (must be either our listen
+ * port or our advertised port). If it is neither, we return
+ * GNUNET_SYSERR.
+ *
+ * @param plugin global variables
+ * @param in_port port number to check
+ * @return GNUNET_OK if port is either open_port or adv_port
+ */
+static int
+check_port (struct Plugin *plugin, uint16_t in_port)
+{
+ if ((in_port == plugin->port) || (in_port == plugin->aport))
+ return GNUNET_OK;
+ return GNUNET_SYSERR;
+}
+
+
+/**
+ * Function that will be called to check if a binary address for this
+ * plugin is well-formed and corresponds to an address for THIS peer
+ * (as per our configuration). Naturally, if absolutely necessary,
+ * plugins can be a bit conservative in their answer, but in general
+ * plugins should make sure that the address does not redirect
+ * traffic to a 3rd party that might try to man-in-the-middle our
+ * traffic.
+ *
+ * @param cls closure, should be our handle to the Plugin
+ * @param addr pointer to the address
+ * @param addrlen length of addr
+ * @return GNUNET_OK if this is a plausible address for this peer
+ * and transport, GNUNET_SYSERR if not
+ *
+ */
+static int
+udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
+{
+ struct Plugin *plugin = cls;
+ struct IPv4UdpAddress *v4;
+ struct IPv6UdpAddress *v6;
+
+ if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
+ (addrlen != sizeof (struct IPv6UdpAddress)))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (addrlen == sizeof (struct IPv4UdpAddress))
+ {
+ v4 = (struct IPv4UdpAddress *) addr;
+ if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
+ return GNUNET_SYSERR;
+ if (GNUNET_OK !=
+ GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
+ sizeof (struct in_addr)))
+ return GNUNET_SYSERR;
+ }
+ else
+ {
+ v6 = (struct IPv6UdpAddress *) addr;
+ if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
+ return GNUNET_SYSERR;
+ if (GNUNET_OK !=
+ GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
+ sizeof (struct in6_addr)))
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Function called for a quick conversion of the binary address to
+ * a numeric address. Note that the caller must not free the
+ * address and that the next call to this function is allowed
+ * to override the address again.
+ *
+ * @param cls closure
+ * @param addr binary address
+ * @param addrlen length of the address
+ * @return string representing the same address
+ */
+static const char *
+udp_address_to_string (void *cls, const void *addr, size_t addrlen)
+{
+ static char rbuf[INET6_ADDRSTRLEN + 10];
+ char buf[INET6_ADDRSTRLEN];
+ const void *sb;
+ struct in_addr a4;
+ struct in6_addr a6;
+ const struct IPv4UdpAddress *t4;
+ const struct IPv6UdpAddress *t6;
+ int af;
+ uint16_t port;
+
+ if (addrlen == sizeof (struct IPv6UdpAddress))
+ {
+ t6 = addr;
+ af = AF_INET6;
+ port = ntohs (t6->u6_port);
+ memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
+ sb = &a6;
+ }
+ else if (addrlen == sizeof (struct IPv4UdpAddress))
+ {
+ t4 = addr;
+ af = AF_INET;
+ port = ntohs (t4->u4_port);
+ memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
+ sb = &a4;
+ }
+ else
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+ inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
+ GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
+ buf, port);
+ return rbuf;
+}
+
+
+/**
+ * Closure for 'append_port'.
+ */
+struct PrettyPrinterContext
+{
+ /**
+ * Function to call with the result.
+ */
+ GNUNET_TRANSPORT_AddressStringCallback asc;
+
+ /**
+ * Clsoure for 'asc'.
+ */
+ void *asc_cls;
+
+ /**
+ * Port to add after the IP address.
+ */
+ uint16_t port;
+};
+
+
+/**
+ * Append our port and forward the result.
+ *
+ * @param cls a 'struct PrettyPrinterContext'
+ * @param hostname result from DNS resolver
+ */
+static void
+append_port (void *cls, const char *hostname)
+{
+ struct PrettyPrinterContext *ppc = cls;
+ char *ret;
+
+ if (hostname == NULL)
+ {
+ ppc->asc (ppc->asc_cls, NULL);
+ GNUNET_free (ppc);
+ return;
+ }
+ GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
+ ppc->asc (ppc->asc_cls, ret);
+ GNUNET_free (ret);
+}
+
+
+/**
+ * Convert the transports address to a nice, human-readable
+ * format.
+ *
+ * @param cls closure
+ * @param type name of the transport that generated the address
+ * @param addr one of the addresses of the host, NULL for the last address
+ * the specific address format depends on the transport
+ * @param addrlen length of the address
+ * @param numeric should (IP) addresses be displayed in numeric form?
+ * @param timeout after how long should we give up?
+ * @param asc function to call on each string
+ * @param asc_cls closure for asc
+ */
+static void
+udp_plugin_address_pretty_printer (void *cls, const char *type,
+ const void *addr, size_t addrlen,
+ int numeric,
+ struct GNUNET_TIME_Relative timeout,
+ GNUNET_TRANSPORT_AddressStringCallback asc,
+ void *asc_cls)
+{
+ struct PrettyPrinterContext *ppc;
+ const void *sb;
+ size_t sbs;
+ struct sockaddr_in a4;
+ struct sockaddr_in6 a6;
+ const struct IPv4UdpAddress *u4;
+ const struct IPv6UdpAddress *u6;
+ uint16_t port;
+
+ if (addrlen == sizeof (struct IPv6UdpAddress))
+ {
+ u6 = addr;
+ memset (&a6, 0, sizeof (a6));
+ a6.sin6_family = AF_INET6;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ a6.sin6_len = sizeof (a6);
+#endif
+ a6.sin6_port = u6->u6_port;
+ memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
+ port = ntohs (u6->u6_port);
+ sb = &a6;
+ sbs = sizeof (a6);
+ }
+ else if (addrlen == sizeof (struct IPv4UdpAddress))
+ {
+ u4 = addr;
+ memset (&a4, 0, sizeof (a4));
+ a4.sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ a4.sin_len = sizeof (a4);
+#endif
+ a4.sin_port = u4->u4_port;
+ a4.sin_addr.s_addr = u4->ipv4_addr;
+ port = ntohs (u4->u4_port);
+ sb = &a4;
+ sbs = sizeof (a4);
+ }
+ else
+ {
+ /* invalid address */
+ GNUNET_break_op (0);
+ asc (asc_cls, NULL);
+ return;
+ }
+ ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
+ ppc->asc = asc;
+ ppc->asc_cls = asc_cls;
+ ppc->port = port;
+ GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
+}
+
+
+/**
+ * Our external IP address/port mapping has changed.
+ *
+ * @param cls closure, the 'struct LocalAddrList'
+ * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO
to mean
+ * the previous (now invalid) one
+ * @param addr either the previous or the new public IP address
+ * @param addrlen actual lenght of the address
+ */
+static void
+udp_nat_port_map_callback (void *cls, int add_remove,
+ const struct sockaddr *addr, socklen_t addrlen)
+{
+ struct Plugin *plugin = cls;
+ struct IPv4UdpAddress u4;
+ struct IPv6UdpAddress u6;
+ void *arg;
+ size_t args;
+
+ /* convert 'addr' to our internal format */
+ switch (addr->sa_family)
+ {
+ case AF_INET:
+ GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
+ u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
+ u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
+ arg = &u4;
+ args = sizeof (u4);
+ break;
+ case AF_INET6:
+ GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
+ memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
+ sizeof (struct in6_addr));
+ u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
+ arg = &u6;
+ args = sizeof (u6);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+ /* modify our published address list */
+ plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
+}
+
+
+/**
+ * The exported method. Makes the core api available via a global and
+ * returns the udp transport API.
+ *
+ * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
+ * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
+ */
+void *
+libgnunet_plugin_transport_udp_init (void *cls)
+{
+ struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
+ unsigned long long port;
+ unsigned long long aport;
+ struct GNUNET_TRANSPORT_PluginFunctions *api;
+ struct Plugin *plugin;
+ int sockets_created;
+ struct sockaddr_in serverAddrv4;
+ struct sockaddr_in6 serverAddrv6;
+ struct sockaddr *serverAddr;
+ struct sockaddr *addrs[2];
+ socklen_t addrlens[2];
+ socklen_t addrlen;
+ unsigned int tries;
+ unsigned long long udp_max_bps;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
+ &port))
+ port = 2086;
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
+ "MAX_BPS", &udp_max_bps))
+ udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical
purposes */
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
+ "ADVERTISED_PORT", &aport))
+ aport = port;
+ if (port > 65535)
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("Given `%s' option is out of range: %llu > %u\n"), "PORT",
+ port, 65535);
+ return NULL;
+ }
+ memset (&serverAddrv6, 0, sizeof (serverAddrv6));
+ memset (&serverAddrv4, 0, sizeof (serverAddrv4));
+
+ plugin = GNUNET_malloc (sizeof (struct Plugin));
+ GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
+ GNUNET_BANDWIDTH_value_init ((uint32_t)
+ udp_max_bps),
30);
+ plugin->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
+ plugin->port = port;
+ plugin->aport = aport;
+ plugin->env = env;
+ api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
+ api->cls = plugin;
+
+ api->send = &udp_plugin_send;
+ api->disconnect = &udp_disconnect;
+ api->address_pretty_printer = &udp_plugin_address_pretty_printer;
+ api->address_to_string = &udp_address_to_string;
+ api->check_address = &udp_plugin_check_address;
+
+ if (GNUNET_YES ==
+ GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
+ "BINDTO", &plugin->bind4_address))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Binding udp plugin to specific address: `%s'\n",
+ plugin->bind4_address);
+ if (1 != inet_pton (AF_INET, plugin->bind4_address,
&serverAddrv4.sin_addr))
+ {
+ GNUNET_free (plugin->bind4_address);
+ GNUNET_free (plugin);
+ GNUNET_free (api);
+ return NULL;
+ }
+ }
+
+ if (GNUNET_YES ==
+ GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
+ "BINDTO6",
&plugin->bind6_address))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Binding udp plugin to specific address: `%s'\n",
+ plugin->bind6_address);
+ if (1 !=
+ inet_pton (AF_INET6, plugin->bind6_address, &serverAddrv6.sin6_addr))
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
+ plugin->bind6_address);
+ GNUNET_free_non_null (plugin->bind4_address);
+ GNUNET_free (plugin->bind6_address);
+ GNUNET_free (plugin);
+ GNUNET_free (api);
+ return NULL;
+ }
+ }
+
+ plugin->defrags =
+ GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+ plugin->sessions =
+ GNUNET_CONTAINER_multihashmap_create
(UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
+ * 2);
+ plugin->inbound_sessions =
+ GNUNET_CONTAINER_multihashmap_create
(UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
+ * 2);
+ sockets_created = 0;
+ if ((GNUNET_YES !=
+ GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "nat",
+ "DISABLEV6")))
+ {
+ plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
+ if (NULL == plugin->sockv6)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
+ }
+ else
+ {
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ serverAddrv6.sin6_len = sizeof (serverAddrv6);
+#endif
+ serverAddrv6.sin6_family = AF_INET6;
+ serverAddrv6.sin6_addr = in6addr_any;
+ serverAddrv6.sin6_port = htons (plugin->port);
+ addrlen = sizeof (serverAddrv6);
+ serverAddr = (struct sockaddr *) &serverAddrv6;
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
+ ntohs (serverAddrv6.sin6_port));
+#endif
+ tries = 0;
+ while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen)
!=
+ GNUNET_OK)
+ {
+ serverAddrv6.sin6_port = htons (GNUNET_CRYPTO_random_u32
(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root
port */
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "IPv6 Binding failed, trying new port %d\n",
+ ntohs (serverAddrv6.sin6_port));
+#endif
+ tries++;
+ if (tries > 10)
+ {
+ GNUNET_NETWORK_socket_close (plugin->sockv6);
+ plugin->sockv6 = NULL;
+ break;
+ }
+ }
+ if (plugin->sockv6 != NULL)
+ {
+ addrs[sockets_created] = (struct sockaddr *) &serverAddrv6;
+ addrlens[sockets_created] = sizeof (serverAddrv6);
+ sockets_created++;
+ }
+ }
+ }
+
+ plugin->mst =
+ GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
+ plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
+ if (NULL == plugin->sockv4)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
+ }
+ else
+ {
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ serverAddrv4.sin_len = sizeof (serverAddrv4);
+#endif
+ serverAddrv4.sin_family = AF_INET;
+ serverAddrv4.sin_addr.s_addr = INADDR_ANY;
+ serverAddrv4.sin_port = htons (plugin->port);
+ addrlen = sizeof (serverAddrv4);
+ serverAddr = (struct sockaddr *) &serverAddrv4;
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
+ ntohs (serverAddrv4.sin_port));
+#endif
+ tries = 0;
+ while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
+ GNUNET_OK)
+ {
+ serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32
(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port
*/
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "IPv4 Binding failed, trying new port %d\n",
+ ntohs (serverAddrv4.sin_port));
+#endif
+ tries++;
+ if (tries > 10)
+ {
+ GNUNET_NETWORK_socket_close (plugin->sockv4);
+ plugin->sockv4 = NULL;
+ break;
+ }
+ }
+ if (plugin->sockv4 != NULL)
+ {
+ addrs[sockets_created] = (struct sockaddr *) &serverAddrv4;
+ addrlens[sockets_created] = sizeof (serverAddrv4);
+ sockets_created++;
+ }
+ }
+
+ plugin->rs = GNUNET_NETWORK_fdset_create ();
+ GNUNET_NETWORK_fdset_zero (plugin->rs);
+ if (NULL != plugin->sockv4)
+ GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv4);
+ if (NULL != plugin->sockv6)
+ GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv6);
+
+ plugin->select_task =
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
+ NULL, &udp_plugin_select, plugin);
+ if (sockets_created == 0)
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
+ plugin->nat =
+ GNUNET_NAT_register (env->cfg, GNUNET_NO, port, sockets_created,
+ (const struct sockaddr **) addrs, addrlens,
+ &udp_nat_port_map_callback, NULL, plugin);
+ return api;
+}
+
+/**
+ * Shutdown the plugin.
+ *
+ * @param cls our 'struct GNUNET_TRANSPORT_PluginFunctions'
+ * @return NULL
+ */
+void *
+libgnunet_plugin_transport_udp_done (void *cls)
+{
+ struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
+ struct Plugin *plugin = api->cls;
+ struct ReceiveContext *rc;
+
+ /* FIXME: clean up heap and hashmap */
+ GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &destroy_session,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
+ plugin->sessions = NULL;
+ GNUNET_CONTAINER_multihashmap_iterate (plugin->inbound_sessions,
&destroy_inbound_session,
+ NULL);
+ GNUNET_CONTAINER_multihashmap_destroy (plugin->inbound_sessions);
+ plugin->inbound_sessions = NULL;
+ while (NULL != (rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags)))
+ {
+ GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
+ GNUNET_free (rc);
+ }
+ GNUNET_CONTAINER_heap_destroy (plugin->defrags);
+
+ if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (plugin->select_task);
+ plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (plugin->sockv4 != NULL)
+ {
+ GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
+ plugin->sockv4 = NULL;
+ }
+ if (plugin->sockv6 != NULL)
+ {
+ GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
+ plugin->sockv6 = NULL;
+ }
+ GNUNET_SERVER_mst_destroy (plugin->mst);
+ GNUNET_NETWORK_fdset_destroy (plugin->rs);
+ GNUNET_NAT_unregister (plugin->nat);
+ plugin->nat = NULL;
+ GNUNET_free (plugin);
+ GNUNET_free (api);
+ return NULL;
+}
+
+/* end of plugin_transport_udp.c */
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