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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), udp_address_to_string (NULL, addr, addrlen), session, force_address);
631 if ((force_address == GNUNET_SYSERR) && (session == NULL))
632 return GNUNET_SYSERR;
634 /* safety check: comparing address to address stored in session */
635 if ((session != NULL) && (addr != NULL) && (addrlen != 0))
638 /* session timed out */
640 if (GNUNET_TIME_absolute_get().abs_value > s->valid_until.abs_value)
642 LOG (GNUNET_ERROR_TYPE_ERROR,
643 "UDP Session %X is invalid %u\n", session, force_address);
645 plugin->env->session_end (plugin->env->cls, &s->target, s);
646 GNUNET_CONTAINER_multihashmap_remove (plugin->inbound_sessions, &s->target.hashPubKey, s);
648 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
650 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
651 GNUNET_SCHEDULER_cancel(s->invalidation_task);
655 if ((force_address != GNUNET_SYSERR) && (addr != NULL) && (addrlen != 0))
657 LOG (GNUNET_ERROR_TYPE_ERROR,
658 "goto session_invalid: %X %u %s\n", addr, addrlen, udp_address_to_string(NULL, addr, addrlen));
659 goto session_invalid;
661 LOG (GNUNET_ERROR_TYPE_ERROR,
662 "return GNUNET_SYSERR;\n");
663 return GNUNET_SYSERR;
665 if (0 != memcmp (&s->target, target, sizeof (struct GNUNET_PeerIdentity)))
666 return GNUNET_SYSERR;
669 case sizeof (struct IPv4UdpAddress):
670 if (NULL == plugin->sockv4)
673 cont (cont_cls, target, GNUNET_SYSERR);
674 return GNUNET_SYSERR;
677 if (s->addrlen != (sizeof (struct sockaddr_in)))
678 return GNUNET_SYSERR;
679 struct sockaddr_in *a4 = (struct sockaddr_in *) s->sock_addr;
680 GNUNET_assert (a4->sin_port == t4->u4_port);
681 GNUNET_assert (0 == memcmp(&a4->sin_addr, &t4->ipv4_addr, sizeof (struct in_addr)));
682 LOG (GNUNET_ERROR_TYPE_DEBUG,
683 "Session 0x%X successfully checked!\n", session);
685 case sizeof (struct IPv6UdpAddress):
686 if (NULL == plugin->sockv6)
689 cont (cont_cls, target, GNUNET_SYSERR);
690 return GNUNET_SYSERR;
693 GNUNET_assert (s->addrlen == sizeof (struct sockaddr_in6));
694 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *) s->sock_addr;
695 GNUNET_assert (a6->sin6_port == t6->u6_port);
696 GNUNET_assert (0 == memcmp(&a6->sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr)));
697 LOG (GNUNET_ERROR_TYPE_DEBUG,
698 "Session 0x%X successfully checked!\n", session);
701 /* Must have a valid address to send to */
706 peer_session = create_session (plugin, target, addr, addrlen, cont, cont_cls);
707 if (peer_session == NULL)
710 cont (cont_cls, target, GNUNET_SYSERR);
714 udp = (struct UDPMessage *) mbuf;
715 udp->header.size = htons (mlen);
716 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
717 udp->reserved = htonl (0);
718 udp->sender = *plugin->env->my_identity;
719 memcpy (&udp[1], msgbuf, msgbuf_size);
723 mlen = udp_send (plugin, peer_session->sock_addr, &udp->header);
725 cont (cont_cls, target, (mlen > 0) ? GNUNET_OK : GNUNET_SYSERR);
726 GNUNET_free_non_null (peer_session);
730 GNUNET_assert (GNUNET_OK ==
731 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
734 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
736 GNUNET_FRAGMENT_context_create (plugin->env->stats, UDP_MTU,
738 plugin->last_expected_delay,
739 &udp->header, &send_fragment,
747 * Closure for 'process_inbound_tokenized_messages'
749 struct SourceInformation
754 struct GNUNET_PeerIdentity sender;
762 * Number of bytes in source address.
766 struct Session * session;
771 * Message tokenizer has broken up an incomming message. Pass it on
774 * @param cls the 'struct Plugin'
775 * @param client the 'struct SourceInformation'
776 * @param hdr the actual message
779 process_inbound_tokenized_messages (void *cls, void *client,
780 const struct GNUNET_MessageHeader *hdr)
782 struct Plugin *plugin = cls;
783 struct SourceInformation *si = client;
784 struct GNUNET_TRANSPORT_ATS_Information distance[2];
787 distance[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
788 distance[0].value = htonl (1);
789 distance[1].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
790 distance[1].value = htonl (0);
792 LOG (GNUNET_ERROR_TYPE_DEBUG,
793 "Giving Session %X %s to transport\n", si->session, GNUNET_i2s(&si->session->target));
794 plugin->env->receive (plugin->env->cls, &si->sender, hdr, distance, 2, si->session,
799 invalidation_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
801 struct Session * s = cls;
802 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
803 LOG (GNUNET_ERROR_TYPE_ERROR,
804 "Session %X (`%s') is now invalid\n", s, GNUNET_a2s (s->sock_addr,s->addrlen));
806 s->plugin->env->session_end(s->plugin->env->cls, &s->target, s);
807 GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove(s->plugin->inbound_sessions, &s->target.hashPubKey, s));
813 * We've received a UDP Message. Process it (pass contents to main service).
815 * @param plugin plugin context
816 * @param msg the message
817 * @param sender_addr sender address
818 * @param sender_addr_len number of bytes in sender_addr
821 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
822 const struct sockaddr *sender_addr,
823 socklen_t sender_addr_len)
825 struct SourceInformation si;
826 struct IPv4UdpAddress u4;
827 struct IPv6UdpAddress u6;
831 if (0 != ntohl (msg->reserved))
836 if (ntohs (msg->header.size) <
837 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
843 /* convert address */
844 switch (sender_addr->sa_family)
847 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
848 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
849 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
854 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
855 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
856 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
865 LOG (GNUNET_ERROR_TYPE_DEBUG,
866 "Received message with %u bytes from peer `%s' at `%s'\n",
867 (unsigned int) ntohs (msg->header.size),
868 GNUNET_i2s (&msg->sender), GNUNET_a2s (sender_addr,
872 /* create a session for inbound connections */
873 const struct UDPMessage * udp_msg = (const struct UDPMessage *) msg;
874 LOG (GNUNET_ERROR_TYPE_DEBUG,
875 "Lookup inbound UDP sessions for peer `%s' address `%s'\n",
876 GNUNET_i2s (&udp_msg->sender),
877 udp_address_to_string(NULL, arg, args));
879 struct Session * s = NULL;
880 s = find_inbound_session (plugin, &udp_msg->sender, sender_addr, sender_addr_len);
884 LOG (GNUNET_ERROR_TYPE_DEBUG,
885 "Found existing inbound UDP sessions 0x%X for peer `%s' address `%s'\n",
887 GNUNET_i2s (&s->target),
888 udp_address_to_string(NULL, arg, args));
892 s = create_session (plugin, &udp_msg->sender, arg, args, NULL, NULL);
893 LOG (GNUNET_ERROR_TYPE_DEBUG,
894 "Creating inbound UDP sessions 0x%X for peer `%s' address `%s'\n",
896 GNUNET_i2s (&s->target),
897 udp_address_to_string(NULL, arg, args));
899 GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put (plugin->inbound_sessions,
900 &s->target.hashPubKey,
902 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
904 s->valid_until = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
905 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
907 GNUNET_SCHEDULER_cancel(s->invalidation_task);
908 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
909 LOG (GNUNET_ERROR_TYPE_DEBUG,
910 "Rescheduling %X' `%s'\n",
911 s, udp_address_to_string(NULL, arg, args));
913 s->invalidation_task = GNUNET_SCHEDULER_add_delayed(GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, &invalidation_task, s);
914 /* iterate over all embedded messages */
915 si.sender = msg->sender;
919 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
920 ntohs (msg->header.size) -
921 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
926 * Process a defragmented message.
928 * @param cls the 'struct ReceiveContext'
929 * @param msg the message
932 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
934 struct ReceiveContext *rc = cls;
936 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
941 if (ntohs (msg->size) < sizeof (struct UDPMessage))
946 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
947 rc->src_addr, rc->addr_len);
952 * Transmit an acknowledgement.
954 * @param cls the 'struct ReceiveContext'
955 * @param id message ID (unused)
956 * @param msg ack to transmit
959 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
961 struct ReceiveContext *rc = cls;
962 size_t msize = sizeof (struct UDPMessage) + ntohs (msg->size);
964 struct UDPMessage *udp;
967 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending ACK to `%s'\n",
968 GNUNET_a2s (rc->src_addr,
969 (rc->src_addr->sa_family ==
970 AF_INET) ? sizeof (struct sockaddr_in) :
971 sizeof (struct sockaddr_in6)));
973 udp = (struct UDPMessage *) buf;
974 udp->header.size = htons ((uint16_t) msize);
975 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
976 udp->reserved = htonl (0);
977 udp->sender = *rc->plugin->env->my_identity;
978 memcpy (&udp[1], msg, ntohs (msg->size));
979 (void) udp_send (rc->plugin, rc->src_addr, &udp->header);
984 * Closure for 'find_receive_context'.
986 struct FindReceiveContext
989 * Where to store the result.
991 struct ReceiveContext *rc;
996 const struct sockaddr *addr;
999 * Number of bytes in 'addr'.
1006 * Scan the heap for a receive context with the given address.
1008 * @param cls the 'struct FindReceiveContext'
1009 * @param node internal node of the heap
1010 * @param element value stored at the node (a 'struct ReceiveContext')
1011 * @param cost cost associated with the node
1012 * @return GNUNET_YES if we should continue to iterate,
1016 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1017 void *element, GNUNET_CONTAINER_HeapCostType cost)
1019 struct FindReceiveContext *frc = cls;
1020 struct ReceiveContext *e = element;
1022 if ((frc->addr_len == e->addr_len) &&
1023 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1033 * Read and process a message from the given socket.
1035 * @param plugin the overall plugin
1036 * @param rsock socket to read from
1039 udp_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1045 const struct GNUNET_MessageHeader *msg;
1046 const struct GNUNET_MessageHeader *ack;
1047 struct Session *peer_session;
1048 const struct UDPMessage *udp;
1049 struct ReceiveContext *rc;
1050 struct GNUNET_TIME_Absolute now;
1051 struct FindReceiveContext frc;
1053 fromlen = sizeof (addr);
1054 memset (&addr, 0, sizeof (addr));
1056 GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1057 (struct sockaddr *) &addr, &fromlen);
1058 if (ret < sizeof (struct GNUNET_MessageHeader))
1060 GNUNET_break_op (0);
1063 msg = (const struct GNUNET_MessageHeader *) buf;
1065 LOG (GNUNET_ERROR_TYPE_DEBUG,
1066 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) ret,
1067 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs(msg->type));
1069 if (ret != ntohs (msg->size))
1071 GNUNET_break_op (0);
1074 switch (ntohs (msg->type))
1076 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1077 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1079 GNUNET_break_op (0);
1082 process_udp_message (plugin, (const struct UDPMessage *) msg,
1083 (const struct sockaddr *) addr, fromlen);
1085 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1086 if (ntohs (msg->size) <
1087 sizeof (struct UDPMessage) + sizeof (struct GNUNET_MessageHeader))
1089 GNUNET_break_op (0);
1092 udp = (const struct UDPMessage *) msg;
1093 if (ntohl (udp->reserved) != 0)
1095 GNUNET_break_op (0);
1098 ack = (const struct GNUNET_MessageHeader *) &udp[1];
1099 if (ntohs (ack->size) != ntohs (msg->size) - sizeof (struct UDPMessage))
1101 GNUNET_break_op (0);
1105 LOG (GNUNET_ERROR_TYPE_DEBUG,
1106 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1107 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp->sender),
1108 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1111 peer_session = find_session (plugin, &udp->sender);
1112 if (NULL == peer_session)
1115 LOG (GNUNET_ERROR_TYPE_DEBUG,
1116 "Session for ACK not found, dropping ACK!\n");
1120 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (peer_session->frag, ack))
1122 GNUNET_assert (GNUNET_OK ==
1123 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
1127 plugin->last_expected_delay =
1128 GNUNET_FRAGMENT_context_destroy (peer_session->frag);
1129 if (peer_session->cont != NULL)
1130 peer_session->cont (peer_session->cont_cls, &udp->sender, GNUNET_OK);
1131 GNUNET_free (peer_session);
1133 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1135 frc.addr = (const struct sockaddr *) addr;
1136 frc.addr_len = fromlen;
1137 GNUNET_CONTAINER_heap_iterate (plugin->defrags, &find_receive_context,
1139 now = GNUNET_TIME_absolute_get ();
1143 /* need to create a new RC */
1144 rc = GNUNET_malloc (sizeof (struct ReceiveContext) + fromlen);
1145 memcpy (&rc[1], addr, fromlen);
1146 rc->src_addr = (const struct sockaddr *) &rc[1];
1147 rc->addr_len = fromlen;
1148 rc->plugin = plugin;
1150 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1151 UDP_MAX_MESSAGES_IN_DEFRAG, rc,
1152 &fragment_msg_proc, &ack_proc);
1154 GNUNET_CONTAINER_heap_insert (plugin->defrags, rc,
1155 (GNUNET_CONTAINER_HeapCostType)
1159 LOG (GNUNET_ERROR_TYPE_DEBUG,
1160 "UDP processes %u-byte fragment from `%s'\n",
1161 (unsigned int) ntohs (msg->size),
1162 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1165 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (rc->defrag, msg))
1167 /* keep this 'rc' from expiring */
1168 GNUNET_CONTAINER_heap_update_cost (plugin->defrags, rc->hnode,
1169 (GNUNET_CONTAINER_HeapCostType)
1172 if (GNUNET_CONTAINER_heap_get_size (plugin->defrags) >
1173 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1175 /* remove 'rc' that was inactive the longest */
1176 rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags);
1177 GNUNET_assert (NULL != rc);
1178 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
1183 GNUNET_break_op (0);
1190 * We have been notified that our writeset has something to read. We don't
1191 * know which socket needs to be read, so we have to check each one
1192 * Then reschedule this function to be called again once more is available.
1194 * @param cls the plugin handle
1195 * @param tc the scheduling context (for rescheduling this function again)
1198 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1200 struct Plugin *plugin = cls;
1202 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1203 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1205 if ((NULL != plugin->sockv4) &&
1206 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1207 udp_read (plugin, plugin->sockv4);
1208 if ((NULL != plugin->sockv6) &&
1209 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1210 udp_read (plugin, plugin->sockv6);
1211 plugin->select_task =
1212 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1213 GNUNET_SCHEDULER_NO_TASK,
1214 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1215 NULL, &udp_plugin_select, plugin);
1221 * Check if the given port is plausible (must be either our listen
1222 * port or our advertised port). If it is neither, we return
1225 * @param plugin global variables
1226 * @param in_port port number to check
1227 * @return GNUNET_OK if port is either open_port or adv_port
1230 check_port (struct Plugin *plugin, uint16_t in_port)
1232 if ((in_port == plugin->port) || (in_port == plugin->aport))
1234 return GNUNET_SYSERR;
1239 * Function that will be called to check if a binary address for this
1240 * plugin is well-formed and corresponds to an address for THIS peer
1241 * (as per our configuration). Naturally, if absolutely necessary,
1242 * plugins can be a bit conservative in their answer, but in general
1243 * plugins should make sure that the address does not redirect
1244 * traffic to a 3rd party that might try to man-in-the-middle our
1247 * @param cls closure, should be our handle to the Plugin
1248 * @param addr pointer to the address
1249 * @param addrlen length of addr
1250 * @return GNUNET_OK if this is a plausible address for this peer
1251 * and transport, GNUNET_SYSERR if not
1255 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1257 struct Plugin *plugin = cls;
1258 struct IPv4UdpAddress *v4;
1259 struct IPv6UdpAddress *v6;
1261 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
1262 (addrlen != sizeof (struct IPv6UdpAddress)))
1264 GNUNET_break_op (0);
1265 return GNUNET_SYSERR;
1267 if (addrlen == sizeof (struct IPv4UdpAddress))
1269 v4 = (struct IPv4UdpAddress *) addr;
1270 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
1271 return GNUNET_SYSERR;
1273 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1274 sizeof (struct in_addr)))
1275 return GNUNET_SYSERR;
1279 v6 = (struct IPv6UdpAddress *) addr;
1280 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1282 GNUNET_break_op (0);
1283 return GNUNET_SYSERR;
1285 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
1286 return GNUNET_SYSERR;
1288 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1289 sizeof (struct in6_addr)))
1290 return GNUNET_SYSERR;
1297 * Function called for a quick conversion of the binary address to
1298 * a numeric address. Note that the caller must not free the
1299 * address and that the next call to this function is allowed
1300 * to override the address again.
1302 * @param cls closure
1303 * @param addr binary address
1304 * @param addrlen length of the address
1305 * @return string representing the same address
1308 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
1310 static char rbuf[INET6_ADDRSTRLEN + 10];
1311 char buf[INET6_ADDRSTRLEN];
1315 const struct IPv4UdpAddress *t4;
1316 const struct IPv6UdpAddress *t6;
1320 if (addrlen == sizeof (struct IPv6UdpAddress))
1324 port = ntohs (t6->u6_port);
1325 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
1328 else if (addrlen == sizeof (struct IPv4UdpAddress))
1332 port = ntohs (t4->u4_port);
1333 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
1338 GNUNET_break_op (0);
1341 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
1342 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
1349 * Closure for 'append_port'.
1351 struct PrettyPrinterContext
1354 * Function to call with the result.
1356 GNUNET_TRANSPORT_AddressStringCallback asc;
1359 * Clsoure for 'asc'.
1364 * Port to add after the IP address.
1371 * Append our port and forward the result.
1373 * @param cls a 'struct PrettyPrinterContext'
1374 * @param hostname result from DNS resolver
1377 append_port (void *cls, const char *hostname)
1379 struct PrettyPrinterContext *ppc = cls;
1382 if (hostname == NULL)
1384 ppc->asc (ppc->asc_cls, NULL);
1388 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1389 ppc->asc (ppc->asc_cls, ret);
1395 * Convert the transports address to a nice, human-readable
1398 * @param cls closure
1399 * @param type name of the transport that generated the address
1400 * @param addr one of the addresses of the host, NULL for the last address
1401 * the specific address format depends on the transport
1402 * @param addrlen length of the address
1403 * @param numeric should (IP) addresses be displayed in numeric form?
1404 * @param timeout after how long should we give up?
1405 * @param asc function to call on each string
1406 * @param asc_cls closure for asc
1409 udp_plugin_address_pretty_printer (void *cls, const char *type,
1410 const void *addr, size_t addrlen,
1412 struct GNUNET_TIME_Relative timeout,
1413 GNUNET_TRANSPORT_AddressStringCallback asc,
1416 struct PrettyPrinterContext *ppc;
1419 struct sockaddr_in a4;
1420 struct sockaddr_in6 a6;
1421 const struct IPv4UdpAddress *u4;
1422 const struct IPv6UdpAddress *u6;
1425 if (addrlen == sizeof (struct IPv6UdpAddress))
1428 memset (&a6, 0, sizeof (a6));
1429 a6.sin6_family = AF_INET6;
1430 #if HAVE_SOCKADDR_IN_SIN_LEN
1431 a6.sin6_len = sizeof (a6);
1433 a6.sin6_port = u6->u6_port;
1434 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
1435 port = ntohs (u6->u6_port);
1439 else if (addrlen == sizeof (struct IPv4UdpAddress))
1442 memset (&a4, 0, sizeof (a4));
1443 a4.sin_family = AF_INET;
1444 #if HAVE_SOCKADDR_IN_SIN_LEN
1445 a4.sin_len = sizeof (a4);
1447 a4.sin_port = u4->u4_port;
1448 a4.sin_addr.s_addr = u4->ipv4_addr;
1449 port = ntohs (u4->u4_port);
1455 /* invalid address */
1456 GNUNET_break_op (0);
1457 asc (asc_cls, NULL);
1460 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1462 ppc->asc_cls = asc_cls;
1464 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
1469 * Our external IP address/port mapping has changed.
1471 * @param cls closure, the 'struct LocalAddrList'
1472 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
1473 * the previous (now invalid) one
1474 * @param addr either the previous or the new public IP address
1475 * @param addrlen actual lenght of the address
1478 udp_nat_port_map_callback (void *cls, int add_remove,
1479 const struct sockaddr *addr, socklen_t addrlen)
1481 struct Plugin *plugin = cls;
1482 struct IPv4UdpAddress u4;
1483 struct IPv6UdpAddress u6;
1487 /* convert 'addr' to our internal format */
1488 switch (addr->sa_family)
1491 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1492 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1493 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1498 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1499 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1500 sizeof (struct in6_addr));
1501 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1509 /* modify our published address list */
1510 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1515 * The exported method. Makes the core api available via a global and
1516 * returns the udp transport API.
1518 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
1519 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
1522 libgnunet_plugin_transport_udp_init (void *cls)
1524 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1525 unsigned long long port;
1526 unsigned long long aport;
1527 struct GNUNET_TRANSPORT_PluginFunctions *api;
1528 struct Plugin *plugin;
1529 int sockets_created;
1530 struct sockaddr_in serverAddrv4;
1531 struct sockaddr_in6 serverAddrv6;
1532 struct sockaddr *serverAddr;
1533 struct sockaddr *addrs[2];
1534 socklen_t addrlens[2];
1537 unsigned long long udp_max_bps;
1540 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
1544 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1545 "MAX_BPS", &udp_max_bps))
1546 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
1548 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1549 "ADVERTISED_PORT", &aport))
1553 LOG (GNUNET_ERROR_TYPE_WARNING,
1554 _("Given `%s' option is out of range: %llu > %u\n"), "PORT",
1558 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1559 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1561 plugin = GNUNET_malloc (sizeof (struct Plugin));
1562 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1563 GNUNET_BANDWIDTH_value_init ((uint32_t)
1565 plugin->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
1566 plugin->port = port;
1567 plugin->aport = aport;
1569 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1572 api->send = &udp_plugin_send;
1573 api->disconnect = &udp_disconnect;
1574 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1575 api->address_to_string = &udp_address_to_string;
1576 api->check_address = &udp_plugin_check_address;
1579 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1580 "BINDTO", &plugin->bind4_address))
1582 LOG (GNUNET_ERROR_TYPE_DEBUG,
1583 "Binding udp plugin to specific address: `%s'\n",
1584 plugin->bind4_address);
1585 if (1 != inet_pton (AF_INET, plugin->bind4_address, &serverAddrv4.sin_addr))
1587 GNUNET_free (plugin->bind4_address);
1588 GNUNET_free (plugin);
1595 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1596 "BINDTO6", &plugin->bind6_address))
1598 LOG (GNUNET_ERROR_TYPE_DEBUG,
1599 "Binding udp plugin to specific address: `%s'\n",
1600 plugin->bind6_address);
1602 inet_pton (AF_INET6, plugin->bind6_address, &serverAddrv6.sin6_addr))
1604 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
1605 plugin->bind6_address);
1606 GNUNET_free_non_null (plugin->bind4_address);
1607 GNUNET_free (plugin->bind6_address);
1608 GNUNET_free (plugin);
1615 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1617 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
1619 plugin->inbound_sessions =
1620 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
1622 sockets_created = 0;
1624 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "nat",
1627 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1628 if (NULL == plugin->sockv6)
1630 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1634 #if HAVE_SOCKADDR_IN_SIN_LEN
1635 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1637 serverAddrv6.sin6_family = AF_INET6;
1638 serverAddrv6.sin6_addr = in6addr_any;
1639 serverAddrv6.sin6_port = htons (plugin->port);
1640 addrlen = sizeof (serverAddrv6);
1641 serverAddr = (struct sockaddr *) &serverAddrv6;
1643 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1644 ntohs (serverAddrv6.sin6_port));
1647 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1650 serverAddrv6.sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1652 LOG (GNUNET_ERROR_TYPE_DEBUG,
1653 "IPv6 Binding failed, trying new port %d\n",
1654 ntohs (serverAddrv6.sin6_port));
1659 GNUNET_NETWORK_socket_close (plugin->sockv6);
1660 plugin->sockv6 = NULL;
1664 if (plugin->sockv6 != NULL)
1666 addrs[sockets_created] = (struct sockaddr *) &serverAddrv6;
1667 addrlens[sockets_created] = sizeof (serverAddrv6);
1674 GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
1675 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1676 if (NULL == plugin->sockv4)
1678 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1682 #if HAVE_SOCKADDR_IN_SIN_LEN
1683 serverAddrv4.sin_len = sizeof (serverAddrv4);
1685 serverAddrv4.sin_family = AF_INET;
1686 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1687 serverAddrv4.sin_port = htons (plugin->port);
1688 addrlen = sizeof (serverAddrv4);
1689 serverAddr = (struct sockaddr *) &serverAddrv4;
1691 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1692 ntohs (serverAddrv4.sin_port));
1695 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1698 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1700 LOG (GNUNET_ERROR_TYPE_DEBUG,
1701 "IPv4 Binding failed, trying new port %d\n",
1702 ntohs (serverAddrv4.sin_port));
1707 GNUNET_NETWORK_socket_close (plugin->sockv4);
1708 plugin->sockv4 = NULL;
1712 if (plugin->sockv4 != NULL)
1714 addrs[sockets_created] = (struct sockaddr *) &serverAddrv4;
1715 addrlens[sockets_created] = sizeof (serverAddrv4);
1720 plugin->rs = GNUNET_NETWORK_fdset_create ();
1721 GNUNET_NETWORK_fdset_zero (plugin->rs);
1722 if (NULL != plugin->sockv4)
1723 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv4);
1724 if (NULL != plugin->sockv6)
1725 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv6);
1727 plugin->select_task =
1728 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1729 GNUNET_SCHEDULER_NO_TASK,
1730 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1731 NULL, &udp_plugin_select, plugin);
1732 if (sockets_created == 0)
1733 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
1735 GNUNET_NAT_register (env->cfg, GNUNET_NO, port, sockets_created,
1736 (const struct sockaddr **) addrs, addrlens,
1737 &udp_nat_port_map_callback, NULL, plugin);
1743 static void invalidation_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1745 struct Session * s = cls;
1746 struct Plugin * plugin = s->plugin;
1748 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
1750 GNUNET_CONTAINER_multihashmap_remove (plugin->inbound_sessions, &s->target.hashPubKey, s);
1753 plugin->env->session_end (plugin->env->cls, &s->target, s);
1754 LOG (GNUNET_ERROR_TYPE_ERROR,
1755 "Session %X is now invalid\n", s);
1756 destroy_session(s, &s->target.hashPubKey, s);
1763 * Shutdown the plugin.
1765 * @param cls our 'struct GNUNET_TRANSPORT_PluginFunctions'
1769 libgnunet_plugin_transport_udp_done (void *cls)
1771 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1772 struct Plugin *plugin = api->cls;
1773 struct ReceiveContext *rc;
1775 /* FIXME: clean up heap and hashmap */
1776 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &destroy_session,
1778 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
1779 plugin->sessions = NULL;
1780 GNUNET_CONTAINER_multihashmap_iterate (plugin->inbound_sessions, &destroy_inbound_session,
1782 GNUNET_CONTAINER_multihashmap_destroy (plugin->inbound_sessions);
1783 plugin->inbound_sessions = NULL;
1784 while (NULL != (rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags)))
1786 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
1789 GNUNET_CONTAINER_heap_destroy (plugin->defrags);
1791 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1793 GNUNET_SCHEDULER_cancel (plugin->select_task);
1794 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1796 if (plugin->sockv4 != NULL)
1798 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
1799 plugin->sockv4 = NULL;
1801 if (plugin->sockv6 != NULL)
1803 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
1804 plugin->sockv6 = NULL;
1806 GNUNET_SERVER_mst_destroy (plugin->mst);
1807 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1808 GNUNET_NAT_unregister (plugin->nat);
1810 GNUNET_free (plugin);
1815 /* end of plugin_transport_udp.c */