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3 (C) 2010, 2011 Christian Grothoff (and other contributing authors)
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22 * @file transport/plugin_transport_udp.c
23 * @brief Implementation of the UDP NAT punching
25 * @author Christian Grothoff
26 * @author Nathan Evans
29 #include "gnunet_hello_lib.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_fragmentation_lib.h"
32 #include "gnunet_nat_lib.h"
33 #include "gnunet_protocols.h"
34 #include "gnunet_resolver_service.h"
35 #include "gnunet_signatures.h"
36 #include "gnunet_constants.h"
37 #include "gnunet_statistics_service.h"
38 #include "gnunet_transport_service.h"
39 #include "gnunet_transport_plugin.h"
40 #include "transport.h"
42 #define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
45 #define DEBUG_UDP GNUNET_EXTRA_LOGGING
48 * MTU for fragmentation subsystem. Should be conservative since
49 * all communicating peers MUST work with this MTU.
54 * Number of messages we can defragment in parallel. We only really
55 * defragment 1 message at a time, but if messages get re-ordered, we
56 * may want to keep knowledge about the previous message to avoid
57 * discarding the current message in favor of a single fragment of a
58 * previous message. 3 should be good since we don't expect massive
59 * message reorderings with UDP.
61 #define UDP_MAX_MESSAGES_IN_DEFRAG 3
64 * We keep a defragmentation queue per sender address. How many
65 * sender addresses do we support at the same time? Memory consumption
66 * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this
67 * value. (So 128 corresponds to 12 MB and should suffice for
68 * connecting to roughly 128 peers via UDP).
70 #define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
74 * UDP Message-Packet header (after defragmentation).
81 struct GNUNET_MessageHeader header;
84 * Always zero for now.
89 * What is the identity of the sender
91 struct GNUNET_PeerIdentity sender;
97 * Network format for IPv4 addresses.
102 * IPv4 address, in network byte order.
104 uint32_t ipv4_addr GNUNET_PACKED;
107 * Port number, in network byte order.
109 uint16_t u4_port GNUNET_PACKED;
114 * Network format for IPv6 addresses.
116 struct IPv6UdpAddress
122 struct in6_addr ipv6_addr GNUNET_PACKED;
125 * Port number, in network byte order.
127 uint16_t u6_port GNUNET_PACKED;
131 /* Forward definition */
136 * Session with another peer. FIXME: why not make this into
137 * a regular 'struct Session' and pass it around!?
143 * Which peer is this session for?
145 struct GNUNET_PeerIdentity target;
148 * Pointer to the global plugin struct.
150 struct Plugin *plugin;
153 * Address of the other peer
155 const struct sockaddr *sock_addr;
160 * Function to call upon completion of the transmission.
162 GNUNET_TRANSPORT_TransmitContinuation cont;
165 * Closure for 'cont'.
170 * Current outgoing message to this peer.
172 struct GNUNET_FRAGMENT_Context *frag;
174 struct GNUNET_TIME_Absolute valid_until;
176 GNUNET_SCHEDULER_TaskIdentifier invalidation_task;
181 * Data structure to track defragmentation contexts based
182 * on the source of the UDP traffic.
184 struct ReceiveContext
188 * Defragmentation context.
190 struct GNUNET_DEFRAGMENT_Context *defrag;
193 * Source address this receive context is for (allocated at the
194 * end of the struct).
196 const struct sockaddr *src_addr;
199 * Reference to master plugin struct.
201 struct Plugin *plugin;
204 * Node in the defrag heap.
206 struct GNUNET_CONTAINER_HeapNode *hnode;
209 * Length of 'src_addr'
217 * Encapsulation of all of the state of the plugin.
225 struct GNUNET_TRANSPORT_PluginEnvironment *env;
228 * Session of peers with whom we are currently connected,
229 * map of peer identity to 'struct PeerSession'.
231 struct GNUNET_CONTAINER_MultiHashMap *sessions;
234 * Session of peers with whom we are currently connected,
235 * map of peer identity to 'struct PeerSession'.
237 struct GNUNET_CONTAINER_MultiHashMap *inbound_sessions;
240 * Heap with all of our defragmentation activities.
242 struct GNUNET_CONTAINER_Heap *defrags;
247 GNUNET_SCHEDULER_TaskIdentifier select_task;
250 * Tokenizer for inbound messages.
252 struct GNUNET_SERVER_MessageStreamTokenizer *mst;
255 * Bandwidth tracker to limit global UDP traffic.
257 struct GNUNET_BANDWIDTH_Tracker tracker;
260 * Address we were told to bind to exclusively (IPv4).
265 * Address we were told to bind to exclusively (IPv6).
270 * Handle to NAT traversal support.
272 struct GNUNET_NAT_Handle *nat;
277 struct GNUNET_NETWORK_FDSet *rs;
280 * The read socket for IPv4
282 struct GNUNET_NETWORK_Handle *sockv4;
285 * The read socket for IPv6
287 struct GNUNET_NETWORK_Handle *sockv6;
290 * expected delay for ACKs
292 struct GNUNET_TIME_Relative last_expected_delay;
300 * Port we advertise on.
306 struct PeerSessionIteratorContext
308 struct Session * result;
315 * Lookup the session for the given peer.
317 * @param plugin the plugin
318 * @param peer peer's identity
319 * @return NULL if we have no session
322 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
324 return GNUNET_CONTAINER_multihashmap_get (plugin->sessions,
328 int inbound_session_iterator (void *cls,
329 const GNUNET_HashCode * key,
332 struct PeerSessionIteratorContext *psc = cls;
333 struct Session *s = value;
334 if (s->addrlen == psc->addrlen)
336 if (0 == memcmp (&s[1], psc->addr, s->addrlen))
339 if (psc->result != NULL)
346 * Lookup the session for the given peer.
348 * @param plugin the plugin
349 * @param peer peer's identity
350 * @return NULL if we have no session
353 find_inbound_session (struct Plugin *plugin,
354 const struct GNUNET_PeerIdentity *peer,
355 const void * addr, size_t addrlen)
357 struct PeerSessionIteratorContext psc;
359 psc.addrlen = addrlen;
362 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->inbound_sessions, &peer->hashPubKey, &inbound_session_iterator, &psc);
368 * Destroy a session, plugin is being unloaded.
371 * @param key hash of public key of target peer
372 * @param value a 'struct PeerSession*' to clean up
373 * @return GNUNET_OK (continue to iterate)
376 destroy_session (void *cls, const GNUNET_HashCode * key, void *value)
378 struct Session *peer_session = value;
380 if (peer_session->frag != NULL)
381 GNUNET_FRAGMENT_context_destroy (peer_session->frag);
382 GNUNET_free (peer_session);
387 * Destroy a session, plugin is being unloaded.
390 * @param key hash of public key of target peer
391 * @param value a 'struct PeerSession*' to clean up
392 * @return GNUNET_OK (continue to iterate)
395 destroy_inbound_session (void *cls, const GNUNET_HashCode * key, void *value)
397 struct Session *s = value;
399 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
400 GNUNET_SCHEDULER_cancel(s->invalidation_task);
406 * Disconnect from a remote node. Clean up session if we have one for this peer
408 * @param cls closure for this call (should be handle to Plugin)
409 * @param target the peeridentity of the peer to disconnect
410 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
413 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
415 struct Plugin *plugin = cls;
416 struct Session *session;
418 session = find_session (plugin, target);
421 GNUNET_assert (GNUNET_OK ==
422 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
426 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->inbound_sessions,
428 &destroy_inbound_session, NULL);
429 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
430 LOG (GNUNET_ERROR_TYPE_ERROR,
433 plugin->last_expected_delay = GNUNET_FRAGMENT_context_destroy (session->frag);
434 if (session->cont != NULL)
435 session->cont (session->cont_cls, target, GNUNET_SYSERR);
436 GNUNET_free (session);
441 * Actually send out the message.
443 * @param plugin the plugin
444 * @param sa the address to send the message to
445 * @param msg message to transmit
446 * @return the number of bytes written
449 udp_send (struct Plugin *plugin, const struct sockaddr *sa,
450 const struct GNUNET_MessageHeader *msg)
455 switch (sa->sa_family)
458 if (NULL == plugin->sockv4)
461 GNUNET_NETWORK_socket_sendto (plugin->sockv4, msg, ntohs (msg->size),
462 sa, slen = sizeof (struct sockaddr_in));
465 if (NULL == plugin->sockv6)
468 GNUNET_NETWORK_socket_sendto (plugin->sockv6, msg, ntohs (msg->size),
469 sa, slen = sizeof (struct sockaddr_in6));
475 if (GNUNET_SYSERR == sent)
477 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
478 LOG (GNUNET_ERROR_TYPE_ERROR,
479 "UDP transmited %u-byte message to %s (%d: %s)\n",
480 (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen),
481 (int) sent, (sent < 0) ? STRERROR (errno) : "ok");
484 LOG (GNUNET_ERROR_TYPE_DEBUG,
485 "UDP transmited %u-byte message to %s (%d: %s)\n",
486 (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen),
487 (int) sent, (sent < 0) ? STRERROR (errno) : "ok");
493 * Function that is called with messages created by the fragmentation
494 * module. In the case of the 'proc' callback of the
495 * GNUNET_FRAGMENT_context_create function, this function must
496 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
498 * @param cls closure, the 'struct PeerSession'
499 * @param msg the message that was created
502 send_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
504 struct Session *session = cls;
506 udp_send (session->plugin, session->sock_addr, msg);
507 GNUNET_FRAGMENT_context_transmission_done (session->frag);
510 static struct Session *
511 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
512 const void *addr, size_t addrlen,
513 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
515 struct Session * peer_session;
516 const struct IPv4UdpAddress *t4;
517 const struct IPv6UdpAddress *t6;
518 struct sockaddr_in *v4;
519 struct sockaddr_in6 *v6;
524 case sizeof (struct IPv4UdpAddress):
525 if (NULL == plugin->sockv4)
531 GNUNET_malloc (sizeof (struct Session) +
532 sizeof (struct sockaddr_in));
533 len = sizeof (struct sockaddr_in);
534 v4 = (struct sockaddr_in *) &peer_session[1];
535 v4->sin_family = AF_INET;
536 #if HAVE_SOCKADDR_IN_SIN_LEN
537 v4->sin_len = sizeof (struct sockaddr_in);
539 v4->sin_port = t4->u4_port;
540 v4->sin_addr.s_addr = t4->ipv4_addr;
542 case sizeof (struct IPv6UdpAddress):
543 if (NULL == plugin->sockv6)
549 GNUNET_malloc (sizeof (struct Session) +
550 sizeof (struct sockaddr_in6));
551 len = sizeof (struct sockaddr_in6);
552 v6 = (struct sockaddr_in6 *) &peer_session[1];
553 v6->sin6_family = AF_INET6;
554 #if HAVE_SOCKADDR_IN_SIN_LEN
555 v6->sin6_len = sizeof (struct sockaddr_in6);
557 v6->sin6_port = t6->u6_port;
558 v6->sin6_addr = t6->ipv6_addr;
561 /* Must have a valid address to send to */
566 peer_session->valid_until = GNUNET_TIME_absolute_get_zero ();
567 peer_session->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
568 peer_session->addrlen = len;
569 peer_session->target = *target;
570 peer_session->plugin = plugin;
571 peer_session->sock_addr = (const struct sockaddr *) &peer_session[1];
572 peer_session->cont = cont;
573 peer_session->cont_cls = cont_cls;
579 udp_address_to_string (void *cls, const void *addr, size_t addrlen);
582 * Function that can be used by the transport service to transmit
583 * a message using the plugin.
586 * @param target who should receive this message (ignored by UDP)
587 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
588 * @param msgbuf_size the size of the msgbuf to send
589 * @param priority how important is the message (ignored by UDP)
590 * @param timeout when should we time out (give up) if we can not transmit?
591 * @param session identifier used for this session (NULL for UDP)
592 * @param addr the addr to send the message to
593 * @param addrlen the len of addr
594 * @param force_address not used, we had better have an address to send to
595 * because we are stateless!!
596 * @param cont continuation to call once the message has
597 * been transmitted (or if the transport is ready
598 * for the next transmission call; or if the
599 * peer disconnected...)
600 * @param cont_cls closure for cont
602 * @return the number of bytes written (may return 0 and the message can
603 * still be transmitted later!)
606 udp_plugin_send (void *cls, const struct GNUNET_PeerIdentity *target,
607 const char *msgbuf, size_t msgbuf_size, unsigned int priority,
608 struct GNUNET_TIME_Relative timeout, struct Session *session,
609 const void *addr, size_t addrlen, int force_address,
610 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
612 struct Plugin *plugin = cls;
613 struct Session *peer_session;
615 const struct IPv4UdpAddress *t4;
616 const struct IPv6UdpAddress *t6;
617 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
619 struct UDPMessage *udp;
621 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
624 return GNUNET_SYSERR;
627 LOG (GNUNET_ERROR_TYPE_DEBUG,
628 "UDP transmits %u-byte message to `%s' using address `%s' session 0x%X mode %i\n",
629 msgbuf_size, GNUNET_i2s (target),
630 udp_address_to_string (NULL, addr, addrlen),
631 session, force_address);
633 if ((force_address == GNUNET_SYSERR) && (session == NULL))
634 return GNUNET_SYSERR;
636 /* safety check: comparing address to address stored in session */
637 if ((session != NULL) && (addr != NULL) && (addrlen != 0))
640 GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains_value (
641 plugin->inbound_sessions, &target->hashPubKey, s));
643 if (0 != memcmp (&s->target, target, sizeof (struct GNUNET_PeerIdentity)))
644 return GNUNET_SYSERR;
647 case sizeof (struct IPv4UdpAddress):
648 if (NULL == plugin->sockv4)
651 cont (cont_cls, target, GNUNET_SYSERR);
652 return GNUNET_SYSERR;
655 if (s->addrlen != (sizeof (struct sockaddr_in)))
656 return GNUNET_SYSERR;
657 struct sockaddr_in *a4 = (struct sockaddr_in *) s->sock_addr;
658 GNUNET_assert (a4->sin_port == t4->u4_port);
659 GNUNET_assert (0 == memcmp(&a4->sin_addr, &t4->ipv4_addr, sizeof (struct in_addr)));
660 LOG (GNUNET_ERROR_TYPE_DEBUG,
661 "Session 0x%X successfully checked!\n", session);
663 case sizeof (struct IPv6UdpAddress):
664 if (NULL == plugin->sockv6)
667 cont (cont_cls, target, GNUNET_SYSERR);
668 return GNUNET_SYSERR;
671 GNUNET_assert (s->addrlen == sizeof (struct sockaddr_in6));
672 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *) s->sock_addr;
673 GNUNET_assert (a6->sin6_port == t6->u6_port);
674 GNUNET_assert (0 == memcmp(&a6->sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr)));
675 LOG (GNUNET_ERROR_TYPE_DEBUG,
676 "Session 0x%X successfully checked!\n", session);
679 /* Must have a valid address to send to */
684 if ((addr == NULL) || (addrlen == 0))
685 return GNUNET_SYSERR;
686 peer_session = create_session (plugin, target, addr, addrlen, cont, cont_cls);
687 if (peer_session == NULL)
690 cont (cont_cls, target, GNUNET_SYSERR);
691 return GNUNET_SYSERR;;
695 udp = (struct UDPMessage *) mbuf;
696 udp->header.size = htons (mlen);
697 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
698 udp->reserved = htonl (0);
699 udp->sender = *plugin->env->my_identity;
700 memcpy (&udp[1], msgbuf, msgbuf_size);
704 mlen = udp_send (plugin, peer_session->sock_addr, &udp->header);
706 cont (cont_cls, target, (mlen > 0) ? GNUNET_OK : GNUNET_SYSERR);
707 GNUNET_free_non_null (peer_session);
711 GNUNET_assert (GNUNET_OK ==
712 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
715 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
717 GNUNET_FRAGMENT_context_create (plugin->env->stats, UDP_MTU,
719 plugin->last_expected_delay,
720 &udp->header, &send_fragment,
728 * Closure for 'process_inbound_tokenized_messages'
730 struct SourceInformation
735 struct GNUNET_PeerIdentity sender;
743 * Number of bytes in source address.
747 struct Session * session;
752 * Message tokenizer has broken up an incomming message. Pass it on
755 * @param cls the 'struct Plugin'
756 * @param client the 'struct SourceInformation'
757 * @param hdr the actual message
760 process_inbound_tokenized_messages (void *cls, void *client,
761 const struct GNUNET_MessageHeader *hdr)
763 struct Plugin *plugin = cls;
764 struct SourceInformation *si = client;
765 struct GNUNET_ATS_Information distance;
768 distance.type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
769 distance.value = htonl (1);
771 LOG (GNUNET_ERROR_TYPE_DEBUG,
772 "Giving Session %X %s to transport\n", si->session, GNUNET_i2s(&si->session->target));
773 plugin->env->receive (plugin->env->cls, &si->sender, hdr, &distance, 1, si->session,
778 invalidation_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
780 struct Session * s = cls;
781 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
782 LOG (GNUNET_ERROR_TYPE_ERROR,
783 "Session %X (`%s') is now invalid\n", s, GNUNET_a2s (s->sock_addr,s->addrlen));
785 s->plugin->env->session_end(s->plugin->env->cls, &s->target, s);
786 GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove(s->plugin->inbound_sessions, &s->target.hashPubKey, s));
792 * We've received a UDP Message. Process it (pass contents to main service).
794 * @param plugin plugin context
795 * @param msg the message
796 * @param sender_addr sender address
797 * @param sender_addr_len number of bytes in sender_addr
800 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
801 const struct sockaddr *sender_addr,
802 socklen_t sender_addr_len)
804 struct SourceInformation si;
805 struct IPv4UdpAddress u4;
806 struct IPv6UdpAddress u6;
810 if (0 != ntohl (msg->reserved))
815 if (ntohs (msg->header.size) <
816 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
822 /* convert address */
823 switch (sender_addr->sa_family)
826 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
827 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
828 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
833 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
834 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
835 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
844 LOG (GNUNET_ERROR_TYPE_DEBUG,
845 "Received message with %u bytes from peer `%s' at `%s'\n",
846 (unsigned int) ntohs (msg->header.size),
847 GNUNET_i2s (&msg->sender), GNUNET_a2s (sender_addr,
851 /* create a session for inbound connections */
852 const struct UDPMessage * udp_msg = (const struct UDPMessage *) msg;
853 LOG (GNUNET_ERROR_TYPE_DEBUG,
854 "Lookup inbound UDP sessions for peer `%s' address `%s'\n",
855 GNUNET_i2s (&udp_msg->sender),
856 udp_address_to_string(NULL, arg, args));
858 struct Session * s = NULL;
859 s = find_inbound_session (plugin, &udp_msg->sender, sender_addr, sender_addr_len);
863 LOG (GNUNET_ERROR_TYPE_DEBUG,
864 "Found existing inbound UDP sessions 0x%X for peer `%s' address `%s'\n",
866 GNUNET_i2s (&s->target),
867 udp_address_to_string(NULL, arg, args));
871 s = create_session (plugin, &udp_msg->sender, arg, args, NULL, NULL);
872 LOG (GNUNET_ERROR_TYPE_DEBUG,
873 "Creating inbound UDP sessions 0x%X for peer `%s' address `%s'\n",
875 GNUNET_i2s (&s->target),
876 udp_address_to_string(NULL, arg, args));
878 GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put (plugin->inbound_sessions,
879 &s->target.hashPubKey,
881 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
883 s->valid_until = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
884 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
886 GNUNET_SCHEDULER_cancel(s->invalidation_task);
887 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
888 LOG (GNUNET_ERROR_TYPE_DEBUG,
889 "Rescheduling %X' `%s'\n",
890 s, udp_address_to_string(NULL, arg, args));
892 s->invalidation_task = GNUNET_SCHEDULER_add_delayed(GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, &invalidation_task, s);
893 /* iterate over all embedded messages */
894 si.sender = msg->sender;
898 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
899 ntohs (msg->header.size) -
900 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
905 * Process a defragmented message.
907 * @param cls the 'struct ReceiveContext'
908 * @param msg the message
911 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
913 struct ReceiveContext *rc = cls;
915 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
920 if (ntohs (msg->size) < sizeof (struct UDPMessage))
925 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
926 rc->src_addr, rc->addr_len);
931 * Transmit an acknowledgement.
933 * @param cls the 'struct ReceiveContext'
934 * @param id message ID (unused)
935 * @param msg ack to transmit
938 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
940 struct ReceiveContext *rc = cls;
941 size_t msize = sizeof (struct UDPMessage) + ntohs (msg->size);
943 struct UDPMessage *udp;
946 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending ACK to `%s'\n",
947 GNUNET_a2s (rc->src_addr,
948 (rc->src_addr->sa_family ==
949 AF_INET) ? sizeof (struct sockaddr_in) :
950 sizeof (struct sockaddr_in6)));
952 udp = (struct UDPMessage *) buf;
953 udp->header.size = htons ((uint16_t) msize);
954 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
955 udp->reserved = htonl (0);
956 udp->sender = *rc->plugin->env->my_identity;
957 memcpy (&udp[1], msg, ntohs (msg->size));
958 (void) udp_send (rc->plugin, rc->src_addr, &udp->header);
963 * Closure for 'find_receive_context'.
965 struct FindReceiveContext
968 * Where to store the result.
970 struct ReceiveContext *rc;
975 const struct sockaddr *addr;
978 * Number of bytes in 'addr'.
985 * Scan the heap for a receive context with the given address.
987 * @param cls the 'struct FindReceiveContext'
988 * @param node internal node of the heap
989 * @param element value stored at the node (a 'struct ReceiveContext')
990 * @param cost cost associated with the node
991 * @return GNUNET_YES if we should continue to iterate,
995 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
996 void *element, GNUNET_CONTAINER_HeapCostType cost)
998 struct FindReceiveContext *frc = cls;
999 struct ReceiveContext *e = element;
1001 if ((frc->addr_len == e->addr_len) &&
1002 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1012 * Read and process a message from the given socket.
1014 * @param plugin the overall plugin
1015 * @param rsock socket to read from
1018 udp_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1024 const struct GNUNET_MessageHeader *msg;
1025 const struct GNUNET_MessageHeader *ack;
1026 struct Session *peer_session;
1027 const struct UDPMessage *udp;
1028 struct ReceiveContext *rc;
1029 struct GNUNET_TIME_Absolute now;
1030 struct FindReceiveContext frc;
1032 fromlen = sizeof (addr);
1033 memset (&addr, 0, sizeof (addr));
1035 GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1036 (struct sockaddr *) &addr, &fromlen);
1037 if (ret < sizeof (struct GNUNET_MessageHeader))
1039 GNUNET_break_op (0);
1042 msg = (const struct GNUNET_MessageHeader *) buf;
1044 LOG (GNUNET_ERROR_TYPE_DEBUG,
1045 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) ret,
1046 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs(msg->type));
1048 if (ret != ntohs (msg->size))
1050 GNUNET_break_op (0);
1053 switch (ntohs (msg->type))
1055 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1056 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1058 GNUNET_break_op (0);
1061 process_udp_message (plugin, (const struct UDPMessage *) msg,
1062 (const struct sockaddr *) addr, fromlen);
1064 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1065 if (ntohs (msg->size) <
1066 sizeof (struct UDPMessage) + sizeof (struct GNUNET_MessageHeader))
1068 GNUNET_break_op (0);
1071 udp = (const struct UDPMessage *) msg;
1072 if (ntohl (udp->reserved) != 0)
1074 GNUNET_break_op (0);
1077 ack = (const struct GNUNET_MessageHeader *) &udp[1];
1078 if (ntohs (ack->size) != ntohs (msg->size) - sizeof (struct UDPMessage))
1080 GNUNET_break_op (0);
1084 LOG (GNUNET_ERROR_TYPE_DEBUG,
1085 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1086 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp->sender),
1087 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1090 peer_session = find_session (plugin, &udp->sender);
1091 if (NULL == peer_session)
1094 LOG (GNUNET_ERROR_TYPE_DEBUG,
1095 "Session for ACK not found, dropping ACK!\n");
1099 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (peer_session->frag, ack))
1101 GNUNET_assert (GNUNET_OK ==
1102 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
1106 plugin->last_expected_delay =
1107 GNUNET_FRAGMENT_context_destroy (peer_session->frag);
1108 if (peer_session->cont != NULL)
1109 peer_session->cont (peer_session->cont_cls, &udp->sender, GNUNET_OK);
1110 GNUNET_free (peer_session);
1112 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1114 frc.addr = (const struct sockaddr *) addr;
1115 frc.addr_len = fromlen;
1116 GNUNET_CONTAINER_heap_iterate (plugin->defrags, &find_receive_context,
1118 now = GNUNET_TIME_absolute_get ();
1122 /* need to create a new RC */
1123 rc = GNUNET_malloc (sizeof (struct ReceiveContext) + fromlen);
1124 memcpy (&rc[1], addr, fromlen);
1125 rc->src_addr = (const struct sockaddr *) &rc[1];
1126 rc->addr_len = fromlen;
1127 rc->plugin = plugin;
1129 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1130 UDP_MAX_MESSAGES_IN_DEFRAG, rc,
1131 &fragment_msg_proc, &ack_proc);
1133 GNUNET_CONTAINER_heap_insert (plugin->defrags, rc,
1134 (GNUNET_CONTAINER_HeapCostType)
1138 LOG (GNUNET_ERROR_TYPE_DEBUG,
1139 "UDP processes %u-byte fragment from `%s'\n",
1140 (unsigned int) ntohs (msg->size),
1141 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1144 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (rc->defrag, msg))
1146 /* keep this 'rc' from expiring */
1147 GNUNET_CONTAINER_heap_update_cost (plugin->defrags, rc->hnode,
1148 (GNUNET_CONTAINER_HeapCostType)
1151 if (GNUNET_CONTAINER_heap_get_size (plugin->defrags) >
1152 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1154 /* remove 'rc' that was inactive the longest */
1155 rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags);
1156 GNUNET_assert (NULL != rc);
1157 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
1162 GNUNET_break_op (0);
1169 * We have been notified that our writeset has something to read. We don't
1170 * know which socket needs to be read, so we have to check each one
1171 * Then reschedule this function to be called again once more is available.
1173 * @param cls the plugin handle
1174 * @param tc the scheduling context (for rescheduling this function again)
1177 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1179 struct Plugin *plugin = cls;
1181 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1182 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1184 if ((NULL != plugin->sockv4) &&
1185 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1186 udp_read (plugin, plugin->sockv4);
1187 if ((NULL != plugin->sockv6) &&
1188 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1189 udp_read (plugin, plugin->sockv6);
1190 plugin->select_task =
1191 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1192 GNUNET_SCHEDULER_NO_TASK,
1193 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1194 NULL, &udp_plugin_select, plugin);
1200 * Check if the given port is plausible (must be either our listen
1201 * port or our advertised port). If it is neither, we return
1204 * @param plugin global variables
1205 * @param in_port port number to check
1206 * @return GNUNET_OK if port is either open_port or adv_port
1209 check_port (struct Plugin *plugin, uint16_t in_port)
1211 if ((in_port == plugin->port) || (in_port == plugin->aport))
1213 return GNUNET_SYSERR;
1218 * Function that will be called to check if a binary address for this
1219 * plugin is well-formed and corresponds to an address for THIS peer
1220 * (as per our configuration). Naturally, if absolutely necessary,
1221 * plugins can be a bit conservative in their answer, but in general
1222 * plugins should make sure that the address does not redirect
1223 * traffic to a 3rd party that might try to man-in-the-middle our
1226 * @param cls closure, should be our handle to the Plugin
1227 * @param addr pointer to the address
1228 * @param addrlen length of addr
1229 * @return GNUNET_OK if this is a plausible address for this peer
1230 * and transport, GNUNET_SYSERR if not
1234 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1236 struct Plugin *plugin = cls;
1237 struct IPv4UdpAddress *v4;
1238 struct IPv6UdpAddress *v6;
1240 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
1241 (addrlen != sizeof (struct IPv6UdpAddress)))
1243 GNUNET_break_op (0);
1244 return GNUNET_SYSERR;
1246 if (addrlen == sizeof (struct IPv4UdpAddress))
1248 v4 = (struct IPv4UdpAddress *) addr;
1249 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
1250 return GNUNET_SYSERR;
1252 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1253 sizeof (struct in_addr)))
1254 return GNUNET_SYSERR;
1258 v6 = (struct IPv6UdpAddress *) addr;
1259 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1261 GNUNET_break_op (0);
1262 return GNUNET_SYSERR;
1264 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
1265 return GNUNET_SYSERR;
1267 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1268 sizeof (struct in6_addr)))
1269 return GNUNET_SYSERR;
1276 * Function called for a quick conversion of the binary address to
1277 * a numeric address. Note that the caller must not free the
1278 * address and that the next call to this function is allowed
1279 * to override the address again.
1281 * @param cls closure
1282 * @param addr binary address
1283 * @param addrlen length of the address
1284 * @return string representing the same address
1287 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
1289 static char rbuf[INET6_ADDRSTRLEN + 10];
1290 char buf[INET6_ADDRSTRLEN];
1294 const struct IPv4UdpAddress *t4;
1295 const struct IPv6UdpAddress *t6;
1299 if (addrlen == sizeof (struct IPv6UdpAddress))
1303 port = ntohs (t6->u6_port);
1304 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
1307 else if (addrlen == sizeof (struct IPv4UdpAddress))
1311 port = ntohs (t4->u4_port);
1312 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
1317 GNUNET_break_op (0);
1320 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
1321 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
1328 * Closure for 'append_port'.
1330 struct PrettyPrinterContext
1333 * Function to call with the result.
1335 GNUNET_TRANSPORT_AddressStringCallback asc;
1338 * Clsoure for 'asc'.
1343 * Port to add after the IP address.
1350 * Append our port and forward the result.
1352 * @param cls a 'struct PrettyPrinterContext'
1353 * @param hostname result from DNS resolver
1356 append_port (void *cls, const char *hostname)
1358 struct PrettyPrinterContext *ppc = cls;
1361 if (hostname == NULL)
1363 ppc->asc (ppc->asc_cls, NULL);
1367 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1368 ppc->asc (ppc->asc_cls, ret);
1374 * Convert the transports address to a nice, human-readable
1377 * @param cls closure
1378 * @param type name of the transport that generated the address
1379 * @param addr one of the addresses of the host, NULL for the last address
1380 * the specific address format depends on the transport
1381 * @param addrlen length of the address
1382 * @param numeric should (IP) addresses be displayed in numeric form?
1383 * @param timeout after how long should we give up?
1384 * @param asc function to call on each string
1385 * @param asc_cls closure for asc
1388 udp_plugin_address_pretty_printer (void *cls, const char *type,
1389 const void *addr, size_t addrlen,
1391 struct GNUNET_TIME_Relative timeout,
1392 GNUNET_TRANSPORT_AddressStringCallback asc,
1395 struct PrettyPrinterContext *ppc;
1398 struct sockaddr_in a4;
1399 struct sockaddr_in6 a6;
1400 const struct IPv4UdpAddress *u4;
1401 const struct IPv6UdpAddress *u6;
1404 if (addrlen == sizeof (struct IPv6UdpAddress))
1407 memset (&a6, 0, sizeof (a6));
1408 a6.sin6_family = AF_INET6;
1409 #if HAVE_SOCKADDR_IN_SIN_LEN
1410 a6.sin6_len = sizeof (a6);
1412 a6.sin6_port = u6->u6_port;
1413 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
1414 port = ntohs (u6->u6_port);
1418 else if (addrlen == sizeof (struct IPv4UdpAddress))
1421 memset (&a4, 0, sizeof (a4));
1422 a4.sin_family = AF_INET;
1423 #if HAVE_SOCKADDR_IN_SIN_LEN
1424 a4.sin_len = sizeof (a4);
1426 a4.sin_port = u4->u4_port;
1427 a4.sin_addr.s_addr = u4->ipv4_addr;
1428 port = ntohs (u4->u4_port);
1434 /* invalid address */
1435 GNUNET_break_op (0);
1436 asc (asc_cls, NULL);
1439 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1441 ppc->asc_cls = asc_cls;
1443 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
1448 * Our external IP address/port mapping has changed.
1450 * @param cls closure, the 'struct LocalAddrList'
1451 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
1452 * the previous (now invalid) one
1453 * @param addr either the previous or the new public IP address
1454 * @param addrlen actual lenght of the address
1457 udp_nat_port_map_callback (void *cls, int add_remove,
1458 const struct sockaddr *addr, socklen_t addrlen)
1460 struct Plugin *plugin = cls;
1461 struct IPv4UdpAddress u4;
1462 struct IPv6UdpAddress u6;
1466 /* convert 'addr' to our internal format */
1467 switch (addr->sa_family)
1470 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1471 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1472 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1477 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1478 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1479 sizeof (struct in6_addr));
1480 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1488 /* modify our published address list */
1489 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1494 * The exported method. Makes the core api available via a global and
1495 * returns the udp transport API.
1497 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
1498 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
1501 libgnunet_plugin_transport_udp_init (void *cls)
1503 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1504 unsigned long long port;
1505 unsigned long long aport;
1506 struct GNUNET_TRANSPORT_PluginFunctions *api;
1507 struct Plugin *plugin;
1508 int sockets_created;
1509 struct sockaddr_in serverAddrv4;
1510 struct sockaddr_in6 serverAddrv6;
1511 struct sockaddr *serverAddr;
1512 struct sockaddr *addrs[2];
1513 socklen_t addrlens[2];
1516 unsigned long long udp_max_bps;
1519 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
1523 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1524 "MAX_BPS", &udp_max_bps))
1525 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
1527 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1528 "ADVERTISED_PORT", &aport))
1532 LOG (GNUNET_ERROR_TYPE_WARNING,
1533 _("Given `%s' option is out of range: %llu > %u\n"), "PORT",
1537 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1538 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1540 plugin = GNUNET_malloc (sizeof (struct Plugin));
1541 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1542 GNUNET_BANDWIDTH_value_init ((uint32_t)
1544 plugin->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
1545 plugin->port = port;
1546 plugin->aport = aport;
1548 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1551 api->send = &udp_plugin_send;
1552 api->disconnect = &udp_disconnect;
1553 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1554 api->address_to_string = &udp_address_to_string;
1555 api->check_address = &udp_plugin_check_address;
1558 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1559 "BINDTO", &plugin->bind4_address))
1561 LOG (GNUNET_ERROR_TYPE_DEBUG,
1562 "Binding udp plugin to specific address: `%s'\n",
1563 plugin->bind4_address);
1564 if (1 != inet_pton (AF_INET, plugin->bind4_address, &serverAddrv4.sin_addr))
1566 GNUNET_free (plugin->bind4_address);
1567 GNUNET_free (plugin);
1574 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1575 "BINDTO6", &plugin->bind6_address))
1577 LOG (GNUNET_ERROR_TYPE_DEBUG,
1578 "Binding udp plugin to specific address: `%s'\n",
1579 plugin->bind6_address);
1581 inet_pton (AF_INET6, plugin->bind6_address, &serverAddrv6.sin6_addr))
1583 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
1584 plugin->bind6_address);
1585 GNUNET_free_non_null (plugin->bind4_address);
1586 GNUNET_free (plugin->bind6_address);
1587 GNUNET_free (plugin);
1594 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1596 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
1598 plugin->inbound_sessions =
1599 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
1601 sockets_created = 0;
1603 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "nat",
1606 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1607 if (NULL == plugin->sockv6)
1609 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1613 #if HAVE_SOCKADDR_IN_SIN_LEN
1614 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1616 serverAddrv6.sin6_family = AF_INET6;
1617 serverAddrv6.sin6_addr = in6addr_any;
1618 serverAddrv6.sin6_port = htons (plugin->port);
1619 addrlen = sizeof (serverAddrv6);
1620 serverAddr = (struct sockaddr *) &serverAddrv6;
1622 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1623 ntohs (serverAddrv6.sin6_port));
1626 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1629 serverAddrv6.sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1631 LOG (GNUNET_ERROR_TYPE_DEBUG,
1632 "IPv6 Binding failed, trying new port %d\n",
1633 ntohs (serverAddrv6.sin6_port));
1638 GNUNET_NETWORK_socket_close (plugin->sockv6);
1639 plugin->sockv6 = NULL;
1643 if (plugin->sockv6 != NULL)
1645 addrs[sockets_created] = (struct sockaddr *) &serverAddrv6;
1646 addrlens[sockets_created] = sizeof (serverAddrv6);
1653 GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
1654 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1655 if (NULL == plugin->sockv4)
1657 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1661 #if HAVE_SOCKADDR_IN_SIN_LEN
1662 serverAddrv4.sin_len = sizeof (serverAddrv4);
1664 serverAddrv4.sin_family = AF_INET;
1665 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1666 serverAddrv4.sin_port = htons (plugin->port);
1667 addrlen = sizeof (serverAddrv4);
1668 serverAddr = (struct sockaddr *) &serverAddrv4;
1670 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1671 ntohs (serverAddrv4.sin_port));
1674 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1677 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1679 LOG (GNUNET_ERROR_TYPE_DEBUG,
1680 "IPv4 Binding failed, trying new port %d\n",
1681 ntohs (serverAddrv4.sin_port));
1686 GNUNET_NETWORK_socket_close (plugin->sockv4);
1687 plugin->sockv4 = NULL;
1691 if (plugin->sockv4 != NULL)
1693 addrs[sockets_created] = (struct sockaddr *) &serverAddrv4;
1694 addrlens[sockets_created] = sizeof (serverAddrv4);
1699 plugin->rs = GNUNET_NETWORK_fdset_create ();
1700 GNUNET_NETWORK_fdset_zero (plugin->rs);
1701 if (NULL != plugin->sockv4)
1702 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv4);
1703 if (NULL != plugin->sockv6)
1704 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv6);
1706 plugin->select_task =
1707 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1708 GNUNET_SCHEDULER_NO_TASK,
1709 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1710 NULL, &udp_plugin_select, plugin);
1711 if (sockets_created == 0)
1712 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
1714 GNUNET_NAT_register (env->cfg, GNUNET_NO, port, sockets_created,
1715 (const struct sockaddr **) addrs, addrlens,
1716 &udp_nat_port_map_callback, NULL, plugin);
1722 static void invalidation_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1724 struct Session * s = cls;
1725 struct Plugin * plugin = s->plugin;
1727 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
1729 GNUNET_CONTAINER_multihashmap_remove (plugin->inbound_sessions, &s->target.hashPubKey, s);
1732 plugin->env->session_end (plugin->env->cls, &s->target, s);
1733 LOG (GNUNET_ERROR_TYPE_ERROR,
1734 "Session %X is now invalid\n", s);
1735 destroy_session(s, &s->target.hashPubKey, s);
1742 * Shutdown the plugin.
1744 * @param cls our 'struct GNUNET_TRANSPORT_PluginFunctions'
1748 libgnunet_plugin_transport_udp_done (void *cls)
1750 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1751 struct Plugin *plugin = api->cls;
1752 struct ReceiveContext *rc;
1754 /* FIXME: clean up heap and hashmap */
1755 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &destroy_session,
1757 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
1758 plugin->sessions = NULL;
1759 GNUNET_CONTAINER_multihashmap_iterate (plugin->inbound_sessions, &destroy_inbound_session,
1761 GNUNET_CONTAINER_multihashmap_destroy (plugin->inbound_sessions);
1762 plugin->inbound_sessions = NULL;
1763 while (NULL != (rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags)))
1765 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
1768 GNUNET_CONTAINER_heap_destroy (plugin->defrags);
1770 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1772 GNUNET_SCHEDULER_cancel (plugin->select_task);
1773 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1775 if (plugin->sockv4 != NULL)
1777 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
1778 plugin->sockv4 = NULL;
1780 if (plugin->sockv6 != NULL)
1782 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
1783 plugin->sockv6 = NULL;
1785 GNUNET_SERVER_mst_destroy (plugin->mst);
1786 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1787 GNUNET_NAT_unregister (plugin->nat);
1789 GNUNET_free (plugin);
1794 /* end of plugin_transport_udp.c */