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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 * UDP ACK Message-Packet header (after defragmentation).
99 struct UDP_ACK_Message
104 struct GNUNET_MessageHeader header;
107 * Desired delay for flow control
112 * What is the identity of the sender
114 struct GNUNET_PeerIdentity sender;
119 * Network format for IPv4 addresses.
121 struct IPv4UdpAddress
124 * IPv4 address, in network byte order.
126 uint32_t ipv4_addr GNUNET_PACKED;
129 * Port number, in network byte order.
131 uint16_t u4_port GNUNET_PACKED;
136 * Network format for IPv6 addresses.
138 struct IPv6UdpAddress
144 struct in6_addr ipv6_addr GNUNET_PACKED;
147 * Port number, in network byte order.
149 uint16_t u6_port GNUNET_PACKED;
153 /* Forward definition */
158 * Session with another peer. FIXME: why not make this into
159 * a regular 'struct Session' and pass it around!?
165 * Which peer is this session for?
167 struct GNUNET_PeerIdentity target;
170 * Pointer to the global plugin struct.
172 struct Plugin *plugin;
175 * Address of the other peer
177 const struct sockaddr *sock_addr;
182 * Function to call upon completion of the transmission.
184 GNUNET_TRANSPORT_TransmitContinuation cont;
187 * Closure for 'cont'.
192 * Current outgoing message to this peer.
194 struct GNUNET_FRAGMENT_Context *frag;
196 struct GNUNET_TIME_Absolute valid_until;
198 GNUNET_SCHEDULER_TaskIdentifier invalidation_task;
200 GNUNET_SCHEDULER_TaskIdentifier delayed_cont_task;
203 * Desired delay for next sending we send to other peer
205 struct GNUNET_TIME_Relative flow_delay_for_other_peer;
208 * Desired delay for next sending we received from other peer
210 struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
215 * Data structure to track defragmentation contexts based
216 * on the source of the UDP traffic.
218 struct ReceiveContext
222 * Defragmentation context.
224 struct GNUNET_DEFRAGMENT_Context *defrag;
227 * Source address this receive context is for (allocated at the
228 * end of the struct).
230 const struct sockaddr *src_addr;
233 * Reference to master plugin struct.
235 struct Plugin *plugin;
238 * Node in the defrag heap.
240 struct GNUNET_CONTAINER_HeapNode *hnode;
243 * Length of 'src_addr'
247 struct GNUNET_PeerIdentity id;
253 * Encapsulation of all of the state of the plugin.
261 struct GNUNET_TRANSPORT_PluginEnvironment *env;
264 * Session of peers with whom we are currently connected,
265 * map of peer identity to 'struct PeerSession'.
267 struct GNUNET_CONTAINER_MultiHashMap *sessions;
270 * Session of peers with whom we are currently connected,
271 * map of peer identity to 'struct PeerSession'.
273 struct GNUNET_CONTAINER_MultiHashMap *inbound_sessions;
276 * Heap with all of our defragmentation activities.
278 struct GNUNET_CONTAINER_Heap *defrags;
283 GNUNET_SCHEDULER_TaskIdentifier select_task;
286 * Tokenizer for inbound messages.
288 struct GNUNET_SERVER_MessageStreamTokenizer *mst;
291 * Bandwidth tracker to limit global UDP traffic.
293 struct GNUNET_BANDWIDTH_Tracker tracker;
296 * Address we were told to bind to exclusively (IPv4).
301 * Address we were told to bind to exclusively (IPv6).
306 * Handle to NAT traversal support.
308 struct GNUNET_NAT_Handle *nat;
313 struct GNUNET_NETWORK_FDSet *rs;
316 * The read socket for IPv4
318 struct GNUNET_NETWORK_Handle *sockv4;
321 * The read socket for IPv6
323 struct GNUNET_NETWORK_Handle *sockv6;
326 * expected delay for ACKs
328 struct GNUNET_TIME_Relative last_expected_delay;
336 * Port we advertise on.
342 struct PeerSessionIteratorContext
344 struct Session * result;
351 * Lookup the session for the given peer.
353 * @param plugin the plugin
354 * @param peer peer's identity
355 * @return NULL if we have no session
357 static struct Session *
358 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
360 return GNUNET_CONTAINER_multihashmap_get (plugin->sessions,
366 inbound_session_iterator (void *cls,
367 const GNUNET_HashCode * key,
370 struct PeerSessionIteratorContext *psc = cls;
371 struct Session *s = value;
372 if (s->addrlen == psc->addrlen)
374 if (0 == memcmp (&s[1], psc->addr, s->addrlen))
377 if (psc->result != NULL)
384 * Lookup the session for the given peer.
386 * @param plugin the plugin
387 * @param peer peer's identity
388 * @return NULL if we have no session
390 static struct Session *
391 find_inbound_session (struct Plugin *plugin,
392 const struct GNUNET_PeerIdentity *peer,
393 const void * addr, size_t addrlen)
395 struct PeerSessionIteratorContext psc;
397 psc.addrlen = addrlen;
400 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->inbound_sessions, &peer->hashPubKey, &inbound_session_iterator, &psc);
406 inbound_session_by_addr_iterator (void *cls,
407 const GNUNET_HashCode * key,
410 struct PeerSessionIteratorContext *psc = cls;
411 struct Session *s = value;
412 if (s->addrlen == psc->addrlen)
414 if (0 == memcmp (&s[1], psc->addr, s->addrlen))
417 if (psc->result != NULL)
424 * Lookup the session for the given peer just by address.
426 * @param plugin the plugin
427 * @param addr address
428 * @param addrlen address length
429 * @return NULL if we have no session
431 static struct Session *
432 find_inbound_session_by_addr (struct Plugin *plugin, const void * addr, size_t addrlen)
434 struct PeerSessionIteratorContext psc;
436 psc.addrlen = addrlen;
439 GNUNET_CONTAINER_multihashmap_iterate (plugin->inbound_sessions, &inbound_session_by_addr_iterator, &psc);
445 * Destroy a session, plugin is being unloaded.
448 * @param key hash of public key of target peer
449 * @param value a 'struct PeerSession*' to clean up
450 * @return GNUNET_OK (continue to iterate)
453 destroy_session (void *cls, const GNUNET_HashCode * key, void *value)
455 struct Session *peer_session = value;
457 if (peer_session->frag != NULL)
458 GNUNET_FRAGMENT_context_destroy (peer_session->frag);
459 if (GNUNET_SCHEDULER_NO_TASK != peer_session->delayed_cont_task)
460 GNUNET_SCHEDULER_cancel (peer_session->delayed_cont_task);
461 GNUNET_free (peer_session);
466 * Destroy a session, plugin is being unloaded.
469 * @param key hash of public key of target peer
470 * @param value a 'struct PeerSession*' to clean up
471 * @return GNUNET_OK (continue to iterate)
474 destroy_inbound_session (void *cls, const GNUNET_HashCode * key, void *value)
476 struct Session *s = value;
478 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
479 GNUNET_SCHEDULER_cancel(s->invalidation_task);
480 if (GNUNET_SCHEDULER_NO_TASK != s->delayed_cont_task)
481 GNUNET_SCHEDULER_cancel (s->delayed_cont_task);
487 * Disconnect from a remote node. Clean up session if we have one for this peer
489 * @param cls closure for this call (should be handle to Plugin)
490 * @param target the peeridentity of the peer to disconnect
491 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
494 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
496 struct Plugin *plugin = cls;
497 struct Session *session;
499 session = find_session (plugin, target);
502 GNUNET_assert (GNUNET_OK ==
503 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
507 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->inbound_sessions,
509 &destroy_inbound_session, NULL);
510 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
511 LOG (GNUNET_ERROR_TYPE_ERROR,
514 plugin->last_expected_delay = GNUNET_FRAGMENT_context_destroy (session->frag);
515 if (GNUNET_SCHEDULER_NO_TASK != session->delayed_cont_task)
516 GNUNET_SCHEDULER_cancel (session->delayed_cont_task);
517 if (session->cont != NULL)
518 session->cont (session->cont_cls, target, GNUNET_SYSERR);
519 GNUNET_free (session);
524 * Actually send out the message.
526 * @param plugin the plugin
527 * @param sa the address to send the message to
528 * @param msg message to transmit
529 * @return the number of bytes written
532 udp_send (struct Plugin *plugin, const struct sockaddr *sa,
533 const struct GNUNET_MessageHeader *msg)
538 switch (sa->sa_family)
541 if (NULL == plugin->sockv4)
544 GNUNET_NETWORK_socket_sendto (plugin->sockv4, msg, ntohs (msg->size),
545 sa, slen = sizeof (struct sockaddr_in));
548 if (NULL == plugin->sockv6)
551 GNUNET_NETWORK_socket_sendto (plugin->sockv6, msg, ntohs (msg->size),
552 sa, slen = sizeof (struct sockaddr_in6));
558 if (GNUNET_SYSERR == sent)
560 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
561 LOG (GNUNET_ERROR_TYPE_ERROR,
562 "UDP transmited %u-byte message to %s (%d: %s)\n",
563 (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen),
564 (int) sent, (sent < 0) ? STRERROR (errno) : "ok");
567 LOG (GNUNET_ERROR_TYPE_DEBUG,
568 "UDP transmited %u-byte message to %s (%d: %s)\n",
569 (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen),
570 (int) sent, (sent < 0) ? STRERROR (errno) : "ok");
576 * Function that is called with messages created by the fragmentation
577 * module. In the case of the 'proc' callback of the
578 * GNUNET_FRAGMENT_context_create function, this function must
579 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
581 * @param cls closure, the 'struct PeerSession'
582 * @param msg the message that was created
585 send_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
587 struct Session *session = cls;
589 udp_send (session->plugin, session->sock_addr, msg);
590 GNUNET_FRAGMENT_context_transmission_done (session->frag);
594 static struct Session *
595 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
596 const void *addr, size_t addrlen,
597 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
599 struct Session * peer_session;
600 const struct IPv4UdpAddress *t4;
601 const struct IPv6UdpAddress *t6;
602 struct sockaddr_in *v4;
603 struct sockaddr_in6 *v6;
608 case sizeof (struct IPv4UdpAddress):
609 if (NULL == plugin->sockv4)
615 GNUNET_malloc (sizeof (struct Session) +
616 sizeof (struct sockaddr_in));
617 len = sizeof (struct sockaddr_in);
618 v4 = (struct sockaddr_in *) &peer_session[1];
619 v4->sin_family = AF_INET;
620 #if HAVE_SOCKADDR_IN_SIN_LEN
621 v4->sin_len = sizeof (struct sockaddr_in);
623 v4->sin_port = t4->u4_port;
624 v4->sin_addr.s_addr = t4->ipv4_addr;
626 case sizeof (struct IPv6UdpAddress):
627 if (NULL == plugin->sockv6)
633 GNUNET_malloc (sizeof (struct Session) +
634 sizeof (struct sockaddr_in6));
635 len = sizeof (struct sockaddr_in6);
636 v6 = (struct sockaddr_in6 *) &peer_session[1];
637 v6->sin6_family = AF_INET6;
638 #if HAVE_SOCKADDR_IN_SIN_LEN
639 v6->sin6_len = sizeof (struct sockaddr_in6);
641 v6->sin6_port = t6->u6_port;
642 v6->sin6_addr = t6->ipv6_addr;
645 /* Must have a valid address to send to */
650 peer_session->valid_until = GNUNET_TIME_absolute_get_zero ();
651 peer_session->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
652 peer_session->addrlen = len;
653 peer_session->target = *target;
654 peer_session->plugin = plugin;
655 peer_session->sock_addr = (const struct sockaddr *) &peer_session[1];
656 peer_session->cont = cont;
657 peer_session->cont_cls = cont_cls;
663 udp_address_to_string (void *cls, const void *addr, size_t addrlen);
667 udp_call_continuation (void *cls,
668 const struct GNUNET_SCHEDULER_TaskContext *tc)
670 struct Session *s = cls;
671 GNUNET_TRANSPORT_TransmitContinuation cont = s->cont;
673 s->delayed_cont_task = GNUNET_SCHEDULER_NO_TASK;
675 cont (s->cont_cls, &s->target, GNUNET_OK);
680 * Function that can be used by the transport service to transmit
681 * a message using the plugin.
684 * @param target who should receive this message (ignored by UDP)
685 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
686 * @param msgbuf_size the size of the msgbuf to send
687 * @param priority how important is the message (ignored by UDP)
688 * @param timeout when should we time out (give up) if we can not transmit?
689 * @param session identifier used for this session (NULL for UDP)
690 * @param addr the addr to send the message to
691 * @param addrlen the len of addr
692 * @param force_address not used, we had better have an address to send to
693 * because we are stateless!!
694 * @param cont continuation to call once the message has
695 * been transmitted (or if the transport is ready
696 * for the next transmission call; or if the
697 * peer disconnected...)
698 * @param cont_cls closure for cont
700 * @return the number of bytes written (may return 0 and the message can
701 * still be transmitted later!)
704 udp_plugin_send (void *cls, const struct GNUNET_PeerIdentity *target,
705 const char *msgbuf, size_t msgbuf_size, unsigned int priority,
706 struct GNUNET_TIME_Relative timeout, struct Session *session,
707 const void *addr, size_t addrlen, int force_address,
708 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
710 struct Plugin *plugin = cls;
711 struct Session *peer_session;
713 const struct IPv4UdpAddress *t4;
714 const struct IPv6UdpAddress *t6;
715 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
717 struct UDPMessage *udp;
718 struct GNUNET_TIME_Relative delta;
720 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
723 return GNUNET_SYSERR;
726 LOG (GNUNET_ERROR_TYPE_DEBUG,
727 "UDP transmits %u-byte message to `%s' using address `%s' session 0x%X mode %i\n",
728 msgbuf_size, GNUNET_i2s (target),
729 udp_address_to_string (NULL, addr, addrlen),
730 session, force_address);
732 if ((force_address == GNUNET_SYSERR) && (session == NULL))
733 return GNUNET_SYSERR;
736 /* safety check: comparing address to address stored in session */
737 if ((session != NULL) && (addr != NULL) && (addrlen != 0))
740 GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains_value (
741 plugin->inbound_sessions, &target->hashPubKey, s));
743 if (0 != memcmp (&s->target, target, sizeof (struct GNUNET_PeerIdentity)))
744 return GNUNET_SYSERR;
747 case sizeof (struct IPv4UdpAddress):
748 if (NULL == plugin->sockv4)
751 cont (cont_cls, target, GNUNET_SYSERR);
752 return GNUNET_SYSERR;
755 if (s->addrlen != (sizeof (struct sockaddr_in)))
756 return GNUNET_SYSERR;
757 struct sockaddr_in *a4 = (struct sockaddr_in *) s->sock_addr;
758 GNUNET_assert (a4->sin_port == t4->u4_port);
759 GNUNET_assert (0 == memcmp(&a4->sin_addr, &t4->ipv4_addr, sizeof (struct in_addr)));
760 LOG (GNUNET_ERROR_TYPE_DEBUG,
761 "Session 0x%X successfully checked!\n", session);
763 case sizeof (struct IPv6UdpAddress):
764 if (NULL == plugin->sockv6)
767 cont (cont_cls, target, GNUNET_SYSERR);
768 return GNUNET_SYSERR;
771 GNUNET_assert (s->addrlen == sizeof (struct sockaddr_in6));
772 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *) s->sock_addr;
773 GNUNET_assert (a6->sin6_port == t6->u6_port);
774 GNUNET_assert (0 == memcmp(&a6->sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr)));
775 LOG (GNUNET_ERROR_TYPE_DEBUG,
776 "Session 0x%X successfully checked!\n", session);
779 /* Must have a valid address to send to */
784 if ((addr == NULL) || (addrlen == 0))
785 return GNUNET_SYSERR;
786 peer_session = create_session (plugin, target, addr, addrlen, cont, cont_cls);
787 if (peer_session == NULL)
790 cont (cont_cls, target, GNUNET_SYSERR);
791 return GNUNET_SYSERR;;
795 udp = (struct UDPMessage *) mbuf;
796 udp->header.size = htons (mlen);
797 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
798 udp->reserved = htonl (0);
799 udp->sender = *plugin->env->my_identity;
800 memcpy (&udp[1], msgbuf, msgbuf_size);
803 delta = GNUNET_TIME_absolute_get_remaining (s->flow_delay_from_other_peer);
805 delta = GNUNET_TIME_UNIT_ZERO;
808 mlen = udp_send (plugin, peer_session->sock_addr, &udp->header);
811 if ( (delta.rel_value > 0) &&
815 s->cont_cls = cont_cls;
816 s->delayed_cont_task = GNUNET_SCHEDULER_add_delayed (delta,
817 &udp_call_continuation,
821 cont (cont_cls, target, (mlen > 0) ? GNUNET_OK : GNUNET_SYSERR);
823 GNUNET_free_non_null (peer_session);
827 GNUNET_assert (GNUNET_OK ==
828 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
831 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
833 GNUNET_FRAGMENT_context_create (plugin->env->stats, UDP_MTU,
835 plugin->last_expected_delay,
836 &udp->header, &send_fragment,
844 * Closure for 'process_inbound_tokenized_messages'
846 struct SourceInformation
851 struct GNUNET_PeerIdentity sender;
859 * Number of bytes in source address.
863 struct Session * session;
868 * Message tokenizer has broken up an incomming message. Pass it on
871 * @param cls the 'struct Plugin'
872 * @param client the 'struct SourceInformation'
873 * @param hdr the actual message
876 process_inbound_tokenized_messages (void *cls, void *client,
877 const struct GNUNET_MessageHeader *hdr)
879 struct Plugin *plugin = cls;
880 struct SourceInformation *si = client;
881 struct GNUNET_ATS_Information distance;
882 struct GNUNET_TIME_Relative delay;
885 distance.type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
886 distance.value = htonl (1);
888 LOG (GNUNET_ERROR_TYPE_DEBUG,
889 "Giving Session %X %s to transport\n", si->session, GNUNET_i2s(&si->session->target));
890 delay = plugin->env->receive (plugin->env->cls, &si->sender, hdr, &distance, 1, si->session,
892 si->session->flow_delay_for_other_peer = delay;
896 invalidation_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
898 struct Session * s = cls;
899 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
900 LOG (GNUNET_ERROR_TYPE_ERROR,
901 "Session %X (`%s') is now invalid\n", s, GNUNET_a2s (s->sock_addr,s->addrlen));
903 s->plugin->env->session_end(s->plugin->env->cls, &s->target, s);
904 GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove(s->plugin->inbound_sessions, &s->target.hashPubKey, s));
910 * We've received a UDP Message. Process it (pass contents to main service).
912 * @param plugin plugin context
913 * @param msg the message
914 * @param sender_addr sender address
915 * @param sender_addr_len number of bytes in sender_addr
918 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
919 const struct sockaddr *sender_addr,
920 socklen_t sender_addr_len)
922 struct SourceInformation si;
923 struct IPv4UdpAddress u4;
924 struct IPv6UdpAddress u6;
928 if (0 != ntohl (msg->reserved))
933 if (ntohs (msg->header.size) <
934 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
940 /* convert address */
941 switch (sender_addr->sa_family)
944 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
945 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
946 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
951 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
952 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
953 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
962 LOG (GNUNET_ERROR_TYPE_DEBUG,
963 "Received message with %u bytes from peer `%s' at `%s'\n",
964 (unsigned int) ntohs (msg->header.size),
965 GNUNET_i2s (&msg->sender), GNUNET_a2s (sender_addr,
969 /* create a session for inbound connections */
970 const struct UDPMessage * udp_msg = (const struct UDPMessage *) msg;
971 LOG (GNUNET_ERROR_TYPE_DEBUG,
972 "Lookup inbound UDP sessions for peer `%s' address `%s'\n",
973 GNUNET_i2s (&udp_msg->sender),
974 udp_address_to_string(NULL, arg, args));
976 struct Session * s = NULL;
977 s = find_inbound_session (plugin, &udp_msg->sender, sender_addr, sender_addr_len);
981 LOG (GNUNET_ERROR_TYPE_DEBUG,
982 "Found existing inbound UDP sessions 0x%X for peer `%s' address `%s'\n",
984 GNUNET_i2s (&s->target),
985 udp_address_to_string(NULL, arg, args));
989 s = create_session (plugin, &udp_msg->sender, arg, args, NULL, NULL);
990 LOG (GNUNET_ERROR_TYPE_DEBUG,
991 "Creating inbound UDP sessions 0x%X for peer `%s' address `%s'\n",
993 GNUNET_i2s (&s->target),
994 udp_address_to_string(NULL, arg, args));
996 GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put (plugin->inbound_sessions,
997 &s->target.hashPubKey,
999 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1001 s->valid_until = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1002 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
1004 GNUNET_SCHEDULER_cancel(s->invalidation_task);
1005 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
1006 LOG (GNUNET_ERROR_TYPE_DEBUG,
1007 "Rescheduling %X' `%s'\n",
1008 s, udp_address_to_string(NULL, arg, args));
1010 s->invalidation_task = GNUNET_SCHEDULER_add_delayed(GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, &invalidation_task, s);
1011 /* iterate over all embedded messages */
1012 si.sender = msg->sender;
1016 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1017 ntohs (msg->header.size) -
1018 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1023 * Process a defragmented message.
1025 * @param cls the 'struct ReceiveContext'
1026 * @param msg the message
1029 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1031 struct ReceiveContext *rc = cls;
1033 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1038 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1043 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1044 rc->src_addr, rc->addr_len);
1049 * Transmit an acknowledgement.
1051 * @param cls the 'struct ReceiveContext'
1052 * @param id message ID (unused)
1053 * @param msg ack to transmit
1056 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1058 struct ReceiveContext *rc = cls;
1060 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1062 struct UDP_ACK_Message *udp_ack;
1066 s = find_inbound_session_by_addr (rc->plugin, rc->src_addr, rc->addr_len);
1069 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1070 delay = s->flow_delay_for_other_peer.rel_value;
1077 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending ACK to `%s' including delay of %u ms\n",
1078 GNUNET_a2s (rc->src_addr,
1079 (rc->src_addr->sa_family ==
1080 AF_INET) ? sizeof (struct sockaddr_in) :
1081 sizeof (struct sockaddr_in6)),
1084 udp_ack = (struct UDP_ACK_Message *) buf;
1085 udp_ack->header.size = htons ((uint16_t) msize);
1086 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1087 udp_ack->delay = htonl (delay);
1088 udp_ack->sender = *rc->plugin->env->my_identity;
1089 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1090 (void) udp_send (rc->plugin, rc->src_addr, &udp_ack->header);
1095 * Closure for 'find_receive_context'.
1097 struct FindReceiveContext
1100 * Where to store the result.
1102 struct ReceiveContext *rc;
1107 const struct sockaddr *addr;
1110 * Number of bytes in 'addr'.
1114 struct Session * session;
1119 * Scan the heap for a receive context with the given address.
1121 * @param cls the 'struct FindReceiveContext'
1122 * @param node internal node of the heap
1123 * @param element value stored at the node (a 'struct ReceiveContext')
1124 * @param cost cost associated with the node
1125 * @return GNUNET_YES if we should continue to iterate,
1129 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1130 void *element, GNUNET_CONTAINER_HeapCostType cost)
1132 struct FindReceiveContext *frc = cls;
1133 struct ReceiveContext *e = element;
1135 if ((frc->addr_len == e->addr_len) &&
1136 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1146 * Read and process a message from the given socket.
1148 * @param plugin the overall plugin
1149 * @param rsock socket to read from
1152 udp_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1158 const struct GNUNET_MessageHeader *msg;
1159 const struct GNUNET_MessageHeader *ack;
1160 struct Session *peer_session;
1161 const struct UDP_ACK_Message *udp_ack;
1162 struct ReceiveContext *rc;
1163 struct GNUNET_TIME_Absolute now;
1164 struct FindReceiveContext frc;
1165 struct Session * s = NULL;
1166 struct GNUNET_TIME_Relative flow_delay;
1168 fromlen = sizeof (addr);
1169 memset (&addr, 0, sizeof (addr));
1171 GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1172 (struct sockaddr *) &addr, &fromlen);
1173 if (ret < sizeof (struct GNUNET_MessageHeader))
1175 GNUNET_break_op (0);
1178 msg = (const struct GNUNET_MessageHeader *) buf;
1180 LOG (GNUNET_ERROR_TYPE_DEBUG,
1181 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) ret,
1182 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs(msg->type));
1184 if (ret != ntohs (msg->size))
1186 GNUNET_break_op (0);
1189 switch (ntohs (msg->type))
1191 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1192 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1194 GNUNET_break_op (0);
1197 process_udp_message (plugin, (const struct UDPMessage *) msg,
1198 (const struct sockaddr *) addr, fromlen);
1200 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1202 if (ntohs (msg->size) <
1203 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1205 GNUNET_break_op (0);
1208 udp_ack = (const struct UDP_ACK_Message *) msg;
1209 s = find_inbound_session(plugin, &udp_ack->sender, addr, fromlen);
1212 flow_delay.rel_value = (uint64_t) ntohl(udp_ack->delay);
1214 LOG (GNUNET_ERROR_TYPE_DEBUG,
1215 "We received a sending delay of %llu\n", flow_delay.rel_value);
1217 s->flow_delay_from_other_peer = GNUNET_TIME_relative_to_absolute (flow_delay);
1219 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1220 if (ntohs (ack->size) != ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1222 GNUNET_break_op (0);
1226 LOG (GNUNET_ERROR_TYPE_DEBUG,
1227 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1228 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1229 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1232 peer_session = find_session (plugin, &udp_ack->sender);
1233 if (NULL == peer_session)
1236 LOG (GNUNET_ERROR_TYPE_DEBUG,
1237 "Session for ACK not found, dropping ACK!\n");
1241 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (peer_session->frag, ack))
1243 GNUNET_assert (GNUNET_OK ==
1244 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
1248 plugin->last_expected_delay =
1249 GNUNET_FRAGMENT_context_destroy (peer_session->frag);
1250 if (peer_session->cont != NULL)
1251 peer_session->cont (peer_session->cont_cls, &udp_ack->sender, GNUNET_OK);
1252 GNUNET_free (peer_session);
1254 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1256 frc.addr = (const struct sockaddr *) addr;
1257 frc.addr_len = fromlen;
1258 GNUNET_CONTAINER_heap_iterate (plugin->defrags, &find_receive_context,
1260 now = GNUNET_TIME_absolute_get ();
1264 /* need to create a new RC */
1265 rc = GNUNET_malloc (sizeof (struct ReceiveContext) + fromlen);
1266 memcpy (&rc[1], addr, fromlen);
1267 rc->src_addr = (const struct sockaddr *) &rc[1];
1268 rc->addr_len = fromlen;
1269 rc->plugin = plugin;
1271 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1272 UDP_MAX_MESSAGES_IN_DEFRAG, rc,
1273 &fragment_msg_proc, &ack_proc);
1275 GNUNET_CONTAINER_heap_insert (plugin->defrags, rc,
1276 (GNUNET_CONTAINER_HeapCostType)
1280 LOG (GNUNET_ERROR_TYPE_DEBUG,
1281 "UDP processes %u-byte fragment from `%s'\n",
1282 (unsigned int) ntohs (msg->size),
1283 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1286 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (rc->defrag, msg))
1288 /* keep this 'rc' from expiring */
1289 GNUNET_CONTAINER_heap_update_cost (plugin->defrags, rc->hnode,
1290 (GNUNET_CONTAINER_HeapCostType)
1293 if (GNUNET_CONTAINER_heap_get_size (plugin->defrags) >
1294 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1296 /* remove 'rc' that was inactive the longest */
1297 rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags);
1298 GNUNET_assert (NULL != rc);
1299 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
1304 GNUNET_break_op (0);
1311 * We have been notified that our writeset has something to read. We don't
1312 * know which socket needs to be read, so we have to check each one
1313 * Then reschedule this function to be called again once more is available.
1315 * @param cls the plugin handle
1316 * @param tc the scheduling context (for rescheduling this function again)
1319 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1321 struct Plugin *plugin = cls;
1323 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1324 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1326 if ((NULL != plugin->sockv4) &&
1327 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1328 udp_read (plugin, plugin->sockv4);
1329 if ((NULL != plugin->sockv6) &&
1330 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1331 udp_read (plugin, plugin->sockv6);
1332 plugin->select_task =
1333 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1334 GNUNET_SCHEDULER_NO_TASK,
1335 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1336 NULL, &udp_plugin_select, plugin);
1342 * Check if the given port is plausible (must be either our listen
1343 * port or our advertised port). If it is neither, we return
1346 * @param plugin global variables
1347 * @param in_port port number to check
1348 * @return GNUNET_OK if port is either open_port or adv_port
1351 check_port (struct Plugin *plugin, uint16_t in_port)
1353 if ((in_port == plugin->port) || (in_port == plugin->aport))
1355 return GNUNET_SYSERR;
1360 * Function that will be called to check if a binary address for this
1361 * plugin is well-formed and corresponds to an address for THIS peer
1362 * (as per our configuration). Naturally, if absolutely necessary,
1363 * plugins can be a bit conservative in their answer, but in general
1364 * plugins should make sure that the address does not redirect
1365 * traffic to a 3rd party that might try to man-in-the-middle our
1368 * @param cls closure, should be our handle to the Plugin
1369 * @param addr pointer to the address
1370 * @param addrlen length of addr
1371 * @return GNUNET_OK if this is a plausible address for this peer
1372 * and transport, GNUNET_SYSERR if not
1376 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1378 struct Plugin *plugin = cls;
1379 struct IPv4UdpAddress *v4;
1380 struct IPv6UdpAddress *v6;
1382 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
1383 (addrlen != sizeof (struct IPv6UdpAddress)))
1385 GNUNET_break_op (0);
1386 return GNUNET_SYSERR;
1388 if (addrlen == sizeof (struct IPv4UdpAddress))
1390 v4 = (struct IPv4UdpAddress *) addr;
1391 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
1392 return GNUNET_SYSERR;
1394 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1395 sizeof (struct in_addr)))
1396 return GNUNET_SYSERR;
1400 v6 = (struct IPv6UdpAddress *) addr;
1401 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1403 GNUNET_break_op (0);
1404 return GNUNET_SYSERR;
1406 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
1407 return GNUNET_SYSERR;
1409 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1410 sizeof (struct in6_addr)))
1411 return GNUNET_SYSERR;
1418 * Function called for a quick conversion of the binary address to
1419 * a numeric address. Note that the caller must not free the
1420 * address and that the next call to this function is allowed
1421 * to override the address again.
1423 * @param cls closure
1424 * @param addr binary address
1425 * @param addrlen length of the address
1426 * @return string representing the same address
1429 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
1431 static char rbuf[INET6_ADDRSTRLEN + 10];
1432 char buf[INET6_ADDRSTRLEN];
1436 const struct IPv4UdpAddress *t4;
1437 const struct IPv6UdpAddress *t6;
1441 if (addrlen == sizeof (struct IPv6UdpAddress))
1445 port = ntohs (t6->u6_port);
1446 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
1449 else if (addrlen == sizeof (struct IPv4UdpAddress))
1453 port = ntohs (t4->u4_port);
1454 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
1459 GNUNET_break_op (0);
1462 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
1463 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
1470 * Closure for 'append_port'.
1472 struct PrettyPrinterContext
1475 * Function to call with the result.
1477 GNUNET_TRANSPORT_AddressStringCallback asc;
1480 * Clsoure for 'asc'.
1485 * Port to add after the IP address.
1492 * Append our port and forward the result.
1494 * @param cls a 'struct PrettyPrinterContext'
1495 * @param hostname result from DNS resolver
1498 append_port (void *cls, const char *hostname)
1500 struct PrettyPrinterContext *ppc = cls;
1503 if (hostname == NULL)
1505 ppc->asc (ppc->asc_cls, NULL);
1509 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1510 ppc->asc (ppc->asc_cls, ret);
1516 * Convert the transports address to a nice, human-readable
1519 * @param cls closure
1520 * @param type name of the transport that generated the address
1521 * @param addr one of the addresses of the host, NULL for the last address
1522 * the specific address format depends on the transport
1523 * @param addrlen length of the address
1524 * @param numeric should (IP) addresses be displayed in numeric form?
1525 * @param timeout after how long should we give up?
1526 * @param asc function to call on each string
1527 * @param asc_cls closure for asc
1530 udp_plugin_address_pretty_printer (void *cls, const char *type,
1531 const void *addr, size_t addrlen,
1533 struct GNUNET_TIME_Relative timeout,
1534 GNUNET_TRANSPORT_AddressStringCallback asc,
1537 struct PrettyPrinterContext *ppc;
1540 struct sockaddr_in a4;
1541 struct sockaddr_in6 a6;
1542 const struct IPv4UdpAddress *u4;
1543 const struct IPv6UdpAddress *u6;
1546 if (addrlen == sizeof (struct IPv6UdpAddress))
1549 memset (&a6, 0, sizeof (a6));
1550 a6.sin6_family = AF_INET6;
1551 #if HAVE_SOCKADDR_IN_SIN_LEN
1552 a6.sin6_len = sizeof (a6);
1554 a6.sin6_port = u6->u6_port;
1555 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
1556 port = ntohs (u6->u6_port);
1560 else if (addrlen == sizeof (struct IPv4UdpAddress))
1563 memset (&a4, 0, sizeof (a4));
1564 a4.sin_family = AF_INET;
1565 #if HAVE_SOCKADDR_IN_SIN_LEN
1566 a4.sin_len = sizeof (a4);
1568 a4.sin_port = u4->u4_port;
1569 a4.sin_addr.s_addr = u4->ipv4_addr;
1570 port = ntohs (u4->u4_port);
1576 /* invalid address */
1577 GNUNET_break_op (0);
1578 asc (asc_cls, NULL);
1581 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1583 ppc->asc_cls = asc_cls;
1585 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
1590 * Our external IP address/port mapping has changed.
1592 * @param cls closure, the 'struct LocalAddrList'
1593 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
1594 * the previous (now invalid) one
1595 * @param addr either the previous or the new public IP address
1596 * @param addrlen actual lenght of the address
1599 udp_nat_port_map_callback (void *cls, int add_remove,
1600 const struct sockaddr *addr, socklen_t addrlen)
1602 struct Plugin *plugin = cls;
1603 struct IPv4UdpAddress u4;
1604 struct IPv6UdpAddress u6;
1608 /* convert 'addr' to our internal format */
1609 switch (addr->sa_family)
1612 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1613 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1614 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1619 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1620 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1621 sizeof (struct in6_addr));
1622 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1630 /* modify our published address list */
1631 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1636 * The exported method. Makes the core api available via a global and
1637 * returns the udp transport API.
1639 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
1640 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
1643 libgnunet_plugin_transport_udp_init (void *cls)
1645 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1646 unsigned long long port;
1647 unsigned long long aport;
1648 struct GNUNET_TRANSPORT_PluginFunctions *api;
1649 struct Plugin *plugin;
1650 int sockets_created;
1651 struct sockaddr_in serverAddrv4;
1652 struct sockaddr_in6 serverAddrv6;
1653 struct sockaddr *serverAddr;
1654 struct sockaddr *addrs[2];
1655 socklen_t addrlens[2];
1658 unsigned long long udp_max_bps;
1661 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
1665 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1666 "MAX_BPS", &udp_max_bps))
1667 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
1669 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1670 "ADVERTISED_PORT", &aport))
1674 LOG (GNUNET_ERROR_TYPE_WARNING,
1675 _("Given `%s' option is out of range: %llu > %u\n"), "PORT",
1679 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1680 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1682 plugin = GNUNET_malloc (sizeof (struct Plugin));
1683 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1684 GNUNET_BANDWIDTH_value_init ((uint32_t)
1686 plugin->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
1687 plugin->port = port;
1688 plugin->aport = aport;
1690 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1693 api->send = &udp_plugin_send;
1694 api->disconnect = &udp_disconnect;
1695 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1696 api->address_to_string = &udp_address_to_string;
1697 api->check_address = &udp_plugin_check_address;
1700 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1701 "BINDTO", &plugin->bind4_address))
1703 LOG (GNUNET_ERROR_TYPE_DEBUG,
1704 "Binding udp plugin to specific address: `%s'\n",
1705 plugin->bind4_address);
1706 if (1 != inet_pton (AF_INET, plugin->bind4_address, &serverAddrv4.sin_addr))
1708 GNUNET_free (plugin->bind4_address);
1709 GNUNET_free (plugin);
1716 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1717 "BINDTO6", &plugin->bind6_address))
1719 LOG (GNUNET_ERROR_TYPE_DEBUG,
1720 "Binding udp plugin to specific address: `%s'\n",
1721 plugin->bind6_address);
1723 inet_pton (AF_INET6, plugin->bind6_address, &serverAddrv6.sin6_addr))
1725 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
1726 plugin->bind6_address);
1727 GNUNET_free_non_null (plugin->bind4_address);
1728 GNUNET_free (plugin->bind6_address);
1729 GNUNET_free (plugin);
1736 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1738 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
1740 plugin->inbound_sessions =
1741 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
1743 sockets_created = 0;
1745 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "nat",
1748 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1749 if (NULL == plugin->sockv6)
1751 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1755 #if HAVE_SOCKADDR_IN_SIN_LEN
1756 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1758 serverAddrv6.sin6_family = AF_INET6;
1759 serverAddrv6.sin6_addr = in6addr_any;
1760 serverAddrv6.sin6_port = htons (plugin->port);
1761 addrlen = sizeof (serverAddrv6);
1762 serverAddr = (struct sockaddr *) &serverAddrv6;
1764 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1765 ntohs (serverAddrv6.sin6_port));
1768 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1771 serverAddrv6.sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1773 LOG (GNUNET_ERROR_TYPE_DEBUG,
1774 "IPv6 Binding failed, trying new port %d\n",
1775 ntohs (serverAddrv6.sin6_port));
1780 GNUNET_NETWORK_socket_close (plugin->sockv6);
1781 plugin->sockv6 = NULL;
1785 if (plugin->sockv6 != NULL)
1787 addrs[sockets_created] = (struct sockaddr *) &serverAddrv6;
1788 addrlens[sockets_created] = sizeof (serverAddrv6);
1795 GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
1796 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1797 if (NULL == plugin->sockv4)
1799 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1803 #if HAVE_SOCKADDR_IN_SIN_LEN
1804 serverAddrv4.sin_len = sizeof (serverAddrv4);
1806 serverAddrv4.sin_family = AF_INET;
1807 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1808 serverAddrv4.sin_port = htons (plugin->port);
1809 addrlen = sizeof (serverAddrv4);
1810 serverAddr = (struct sockaddr *) &serverAddrv4;
1812 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1813 ntohs (serverAddrv4.sin_port));
1816 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1819 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1821 LOG (GNUNET_ERROR_TYPE_DEBUG,
1822 "IPv4 Binding failed, trying new port %d\n",
1823 ntohs (serverAddrv4.sin_port));
1828 GNUNET_NETWORK_socket_close (plugin->sockv4);
1829 plugin->sockv4 = NULL;
1833 if (plugin->sockv4 != NULL)
1835 addrs[sockets_created] = (struct sockaddr *) &serverAddrv4;
1836 addrlens[sockets_created] = sizeof (serverAddrv4);
1841 plugin->rs = GNUNET_NETWORK_fdset_create ();
1842 GNUNET_NETWORK_fdset_zero (plugin->rs);
1843 if (NULL != plugin->sockv4)
1844 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv4);
1845 if (NULL != plugin->sockv6)
1846 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv6);
1848 plugin->select_task =
1849 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1850 GNUNET_SCHEDULER_NO_TASK,
1851 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1852 NULL, &udp_plugin_select, plugin);
1853 if (sockets_created == 0)
1854 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
1856 GNUNET_NAT_register (env->cfg, GNUNET_NO, port, sockets_created,
1857 (const struct sockaddr **) addrs, addrlens,
1858 &udp_nat_port_map_callback, NULL, plugin);
1863 * Shutdown the plugin.
1865 * @param cls our 'struct GNUNET_TRANSPORT_PluginFunctions'
1869 libgnunet_plugin_transport_udp_done (void *cls)
1871 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1872 struct Plugin *plugin = api->cls;
1873 struct ReceiveContext *rc;
1875 /* FIXME: clean up heap and hashmap */
1876 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &destroy_session,
1878 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
1879 plugin->sessions = NULL;
1880 GNUNET_CONTAINER_multihashmap_iterate (plugin->inbound_sessions, &destroy_inbound_session,
1882 GNUNET_CONTAINER_multihashmap_destroy (plugin->inbound_sessions);
1883 plugin->inbound_sessions = NULL;
1884 while (NULL != (rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags)))
1886 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
1889 GNUNET_CONTAINER_heap_destroy (plugin->defrags);
1891 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1893 GNUNET_SCHEDULER_cancel (plugin->select_task);
1894 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1896 if (plugin->sockv4 != NULL)
1898 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
1899 plugin->sockv4 = NULL;
1901 if (plugin->sockv6 != NULL)
1903 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
1904 plugin->sockv6 = NULL;
1906 GNUNET_SERVER_mst_destroy (plugin->mst);
1907 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1908 GNUNET_NAT_unregister (plugin->nat);
1910 GNUNET_free (plugin);
1915 /* end of plugin_transport_udp.c */