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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;
331 * The read socket for IPv4
333 struct GNUNET_NETWORK_Handle *sockv4_broadcast;
336 * ID of select broadcast task
338 GNUNET_SCHEDULER_TaskIdentifier select_broadcast_task;
341 * ID of select broadcast task
343 GNUNET_SCHEDULER_TaskIdentifier send_broadcast_task;
348 struct GNUNET_NETWORK_FDSet *broadcast_rs;
352 * expected delay for ACKs
354 struct GNUNET_TIME_Relative last_expected_delay;
357 * Port we broadcasting on.
359 uint16_t broadcast_port;
367 * Port we advertise on.
373 struct PeerSessionIteratorContext
375 struct Session * result;
382 * Lookup the session for the given peer.
384 * @param plugin the plugin
385 * @param peer peer's identity
386 * @return NULL if we have no session
388 static struct Session *
389 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
391 return GNUNET_CONTAINER_multihashmap_get (plugin->sessions,
397 inbound_session_iterator (void *cls,
398 const GNUNET_HashCode * key,
401 struct PeerSessionIteratorContext *psc = cls;
402 struct Session *s = value;
403 if (s->addrlen == psc->addrlen)
405 if (0 == memcmp (&s[1], psc->addr, s->addrlen))
408 if (psc->result != NULL)
415 * Lookup the session for the given peer.
417 * @param plugin the plugin
418 * @param peer peer's identity
419 * @return NULL if we have no session
421 static struct Session *
422 find_inbound_session (struct Plugin *plugin,
423 const struct GNUNET_PeerIdentity *peer,
424 const void * addr, size_t addrlen)
426 struct PeerSessionIteratorContext psc;
428 psc.addrlen = addrlen;
431 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->inbound_sessions, &peer->hashPubKey, &inbound_session_iterator, &psc);
437 inbound_session_by_addr_iterator (void *cls,
438 const GNUNET_HashCode * key,
441 struct PeerSessionIteratorContext *psc = cls;
442 struct Session *s = value;
443 if (s->addrlen == psc->addrlen)
445 if (0 == memcmp (&s[1], psc->addr, s->addrlen))
448 if (psc->result != NULL)
455 * Lookup the session for the given peer just by address.
457 * @param plugin the plugin
458 * @param addr address
459 * @param addrlen address length
460 * @return NULL if we have no session
462 static struct Session *
463 find_inbound_session_by_addr (struct Plugin *plugin, const void * addr, size_t addrlen)
465 struct PeerSessionIteratorContext psc;
467 psc.addrlen = addrlen;
470 GNUNET_CONTAINER_multihashmap_iterate (plugin->inbound_sessions, &inbound_session_by_addr_iterator, &psc);
476 * Destroy a session, plugin is being unloaded.
479 * @param key hash of public key of target peer
480 * @param value a 'struct PeerSession*' to clean up
481 * @return GNUNET_OK (continue to iterate)
484 destroy_session (void *cls, const GNUNET_HashCode * key, void *value)
486 struct Session *peer_session = value;
488 if (peer_session->frag != NULL)
489 GNUNET_FRAGMENT_context_destroy (peer_session->frag);
490 if (GNUNET_SCHEDULER_NO_TASK != peer_session->delayed_cont_task)
491 GNUNET_SCHEDULER_cancel (peer_session->delayed_cont_task);
492 GNUNET_free (peer_session);
497 * Destroy a session, plugin is being unloaded.
500 * @param key hash of public key of target peer
501 * @param value a 'struct PeerSession*' to clean up
502 * @return GNUNET_OK (continue to iterate)
505 destroy_inbound_session (void *cls, const GNUNET_HashCode * key, void *value)
507 struct Session *s = value;
509 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
510 GNUNET_SCHEDULER_cancel(s->invalidation_task);
511 if (GNUNET_SCHEDULER_NO_TASK != s->delayed_cont_task)
512 GNUNET_SCHEDULER_cancel (s->delayed_cont_task);
518 * Disconnect from a remote node. Clean up session if we have one for this peer
520 * @param cls closure for this call (should be handle to Plugin)
521 * @param target the peeridentity of the peer to disconnect
522 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
525 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
527 struct Plugin *plugin = cls;
528 struct Session *session;
530 session = find_session (plugin, target);
533 GNUNET_assert (GNUNET_OK ==
534 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
538 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->inbound_sessions,
540 &destroy_inbound_session, NULL);
541 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
542 LOG (GNUNET_ERROR_TYPE_ERROR,
545 plugin->last_expected_delay = GNUNET_FRAGMENT_context_destroy (session->frag);
546 if (GNUNET_SCHEDULER_NO_TASK != session->delayed_cont_task)
547 GNUNET_SCHEDULER_cancel (session->delayed_cont_task);
548 if (session->cont != NULL)
549 session->cont (session->cont_cls, target, GNUNET_SYSERR);
550 GNUNET_free (session);
555 * Actually send out the message.
557 * @param plugin the plugin
558 * @param sa the address to send the message to
559 * @param msg message to transmit
560 * @return the number of bytes written
563 udp_send (struct Plugin *plugin, const struct sockaddr *sa,
564 const struct GNUNET_MessageHeader *msg)
569 switch (sa->sa_family)
572 if (NULL == plugin->sockv4)
575 GNUNET_NETWORK_socket_sendto (plugin->sockv4, msg, ntohs (msg->size),
576 sa, slen = sizeof (struct sockaddr_in));
579 if (NULL == plugin->sockv6)
582 GNUNET_NETWORK_socket_sendto (plugin->sockv6, msg, ntohs (msg->size),
583 sa, slen = sizeof (struct sockaddr_in6));
589 if (GNUNET_SYSERR == sent)
591 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
592 LOG (GNUNET_ERROR_TYPE_ERROR,
593 "UDP transmited %u-byte message to %s (%d: %s)\n",
594 (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen),
595 (int) sent, (sent < 0) ? STRERROR (errno) : "ok");
598 LOG (GNUNET_ERROR_TYPE_DEBUG,
599 "UDP transmited %u-byte message to %s (%d: %s)\n",
600 (unsigned int) ntohs (msg->size), GNUNET_a2s (sa, slen),
601 (int) sent, (sent < 0) ? STRERROR (errno) : "ok");
607 * Function that is called with messages created by the fragmentation
608 * module. In the case of the 'proc' callback of the
609 * GNUNET_FRAGMENT_context_create function, this function must
610 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
612 * @param cls closure, the 'struct PeerSession'
613 * @param msg the message that was created
616 send_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
618 struct Session *session = cls;
620 udp_send (session->plugin, session->sock_addr, msg);
621 GNUNET_FRAGMENT_context_transmission_done (session->frag);
625 static struct Session *
626 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
627 const void *addr, size_t addrlen,
628 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
630 struct Session * peer_session;
631 const struct IPv4UdpAddress *t4;
632 const struct IPv6UdpAddress *t6;
633 struct sockaddr_in *v4;
634 struct sockaddr_in6 *v6;
639 case sizeof (struct IPv4UdpAddress):
640 if (NULL == plugin->sockv4)
646 GNUNET_malloc (sizeof (struct Session) +
647 sizeof (struct sockaddr_in));
648 len = sizeof (struct sockaddr_in);
649 v4 = (struct sockaddr_in *) &peer_session[1];
650 v4->sin_family = AF_INET;
651 #if HAVE_SOCKADDR_IN_SIN_LEN
652 v4->sin_len = sizeof (struct sockaddr_in);
654 v4->sin_port = t4->u4_port;
655 v4->sin_addr.s_addr = t4->ipv4_addr;
657 case sizeof (struct IPv6UdpAddress):
658 if (NULL == plugin->sockv6)
664 GNUNET_malloc (sizeof (struct Session) +
665 sizeof (struct sockaddr_in6));
666 len = sizeof (struct sockaddr_in6);
667 v6 = (struct sockaddr_in6 *) &peer_session[1];
668 v6->sin6_family = AF_INET6;
669 #if HAVE_SOCKADDR_IN_SIN_LEN
670 v6->sin6_len = sizeof (struct sockaddr_in6);
672 v6->sin6_port = t6->u6_port;
673 v6->sin6_addr = t6->ipv6_addr;
676 /* Must have a valid address to send to */
681 peer_session->valid_until = GNUNET_TIME_absolute_get_zero ();
682 peer_session->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
683 peer_session->addrlen = len;
684 peer_session->target = *target;
685 peer_session->plugin = plugin;
686 peer_session->sock_addr = (const struct sockaddr *) &peer_session[1];
687 peer_session->cont = cont;
688 peer_session->cont_cls = cont_cls;
694 udp_address_to_string (void *cls, const void *addr, size_t addrlen);
698 udp_call_continuation (void *cls,
699 const struct GNUNET_SCHEDULER_TaskContext *tc)
701 struct Session *s = cls;
702 GNUNET_TRANSPORT_TransmitContinuation cont = s->cont;
704 s->delayed_cont_task = GNUNET_SCHEDULER_NO_TASK;
706 cont (s->cont_cls, &s->target, GNUNET_OK);
711 * Function that can be used by the transport service to transmit
712 * a message using the plugin.
715 * @param target who should receive this message (ignored by UDP)
716 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
717 * @param msgbuf_size the size of the msgbuf to send
718 * @param priority how important is the message (ignored by UDP)
719 * @param timeout when should we time out (give up) if we can not transmit?
720 * @param session identifier used for this session (NULL for UDP)
721 * @param addr the addr to send the message to
722 * @param addrlen the len of addr
723 * @param force_address not used, we had better have an address to send to
724 * because we are stateless!!
725 * @param cont continuation to call once the message has
726 * been transmitted (or if the transport is ready
727 * for the next transmission call; or if the
728 * peer disconnected...)
729 * @param cont_cls closure for cont
731 * @return the number of bytes written (may return 0 and the message can
732 * still be transmitted later!)
735 udp_plugin_send (void *cls, const struct GNUNET_PeerIdentity *target,
736 const char *msgbuf, size_t msgbuf_size, unsigned int priority,
737 struct GNUNET_TIME_Relative timeout, struct Session *session,
738 const void *addr, size_t addrlen, int force_address,
739 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
741 struct Plugin *plugin = cls;
742 struct Session *peer_session;
744 const struct IPv4UdpAddress *t4;
745 const struct IPv6UdpAddress *t6;
746 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
748 struct UDPMessage *udp;
749 struct GNUNET_TIME_Relative delta;
751 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
754 return GNUNET_SYSERR;
757 LOG (GNUNET_ERROR_TYPE_DEBUG,
758 "UDP transmits %u-byte message to `%s' using address `%s' session 0x%X mode %i\n",
759 msgbuf_size, GNUNET_i2s (target),
760 udp_address_to_string (NULL, addr, addrlen),
761 session, force_address);
763 if ((force_address == GNUNET_SYSERR) && (session == NULL))
764 return GNUNET_SYSERR;
767 /* safety check: comparing address to address stored in session */
768 if ((session != NULL) && (addr != NULL) && (addrlen != 0))
771 GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains_value (
772 plugin->inbound_sessions, &target->hashPubKey, s));
774 if (0 != memcmp (&s->target, target, sizeof (struct GNUNET_PeerIdentity)))
775 return GNUNET_SYSERR;
778 case sizeof (struct IPv4UdpAddress):
779 if (NULL == plugin->sockv4)
782 cont (cont_cls, target, GNUNET_SYSERR);
783 return GNUNET_SYSERR;
786 if (s->addrlen != (sizeof (struct sockaddr_in)))
787 return GNUNET_SYSERR;
788 struct sockaddr_in *a4 = (struct sockaddr_in *) s->sock_addr;
789 GNUNET_assert (a4->sin_port == t4->u4_port);
790 GNUNET_assert (0 == memcmp(&a4->sin_addr, &t4->ipv4_addr, sizeof (struct in_addr)));
791 LOG (GNUNET_ERROR_TYPE_DEBUG,
792 "Session 0x%X successfully checked!\n", session);
794 case sizeof (struct IPv6UdpAddress):
795 if (NULL == plugin->sockv6)
798 cont (cont_cls, target, GNUNET_SYSERR);
799 return GNUNET_SYSERR;
802 GNUNET_assert (s->addrlen == sizeof (struct sockaddr_in6));
803 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *) s->sock_addr;
804 GNUNET_assert (a6->sin6_port == t6->u6_port);
805 GNUNET_assert (0 == memcmp(&a6->sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr)));
806 LOG (GNUNET_ERROR_TYPE_DEBUG,
807 "Session 0x%X successfully checked!\n", session);
810 /* Must have a valid address to send to */
815 if ((addr == NULL) || (addrlen == 0))
816 return GNUNET_SYSERR;
817 peer_session = create_session (plugin, target, addr, addrlen, cont, cont_cls);
818 if (peer_session == NULL)
821 cont (cont_cls, target, GNUNET_SYSERR);
822 return GNUNET_SYSERR;;
826 udp = (struct UDPMessage *) mbuf;
827 udp->header.size = htons (mlen);
828 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
829 udp->reserved = htonl (0);
830 udp->sender = *plugin->env->my_identity;
831 memcpy (&udp[1], msgbuf, msgbuf_size);
834 delta = GNUNET_TIME_absolute_get_remaining (s->flow_delay_from_other_peer);
836 delta = GNUNET_TIME_UNIT_ZERO;
839 mlen = udp_send (plugin, peer_session->sock_addr, &udp->header);
842 if ( (delta.rel_value > 0) &&
846 s->cont_cls = cont_cls;
847 s->delayed_cont_task = GNUNET_SCHEDULER_add_delayed (delta,
848 &udp_call_continuation,
852 cont (cont_cls, target, (mlen > 0) ? GNUNET_OK : GNUNET_SYSERR);
854 GNUNET_free_non_null (peer_session);
858 GNUNET_assert (GNUNET_OK ==
859 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
862 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
864 GNUNET_FRAGMENT_context_create (plugin->env->stats, UDP_MTU,
866 plugin->last_expected_delay,
867 &udp->header, &send_fragment,
875 * Closure for 'process_inbound_tokenized_messages'
877 struct SourceInformation
882 struct GNUNET_PeerIdentity sender;
890 * Number of bytes in source address.
894 struct Session * session;
899 * Message tokenizer has broken up an incomming message. Pass it on
902 * @param cls the 'struct Plugin'
903 * @param client the 'struct SourceInformation'
904 * @param hdr the actual message
907 process_inbound_tokenized_messages (void *cls, void *client,
908 const struct GNUNET_MessageHeader *hdr)
910 struct Plugin *plugin = cls;
911 struct SourceInformation *si = client;
912 struct GNUNET_ATS_Information distance;
913 struct GNUNET_TIME_Relative delay;
916 distance.type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
917 distance.value = htonl (1);
919 LOG (GNUNET_ERROR_TYPE_DEBUG,
920 "Giving Session %X %s to transport\n", si->session, GNUNET_i2s(&si->session->target));
921 delay = plugin->env->receive (plugin->env->cls, &si->sender, hdr, &distance, 1, si->session,
923 si->session->flow_delay_for_other_peer = delay;
927 invalidation_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
929 struct Session * s = cls;
930 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
931 LOG (GNUNET_ERROR_TYPE_ERROR,
932 "Session %X (`%s') is now invalid\n", s, GNUNET_a2s (s->sock_addr,s->addrlen));
934 s->plugin->env->session_end(s->plugin->env->cls, &s->target, s);
935 GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove(s->plugin->inbound_sessions, &s->target.hashPubKey, s));
941 * We've received a UDP Message. Process it (pass contents to main service).
943 * @param plugin plugin context
944 * @param msg the message
945 * @param sender_addr sender address
946 * @param sender_addr_len number of bytes in sender_addr
949 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
950 const struct sockaddr *sender_addr,
951 socklen_t sender_addr_len)
953 struct SourceInformation si;
954 struct IPv4UdpAddress u4;
955 struct IPv6UdpAddress u6;
959 if (0 != ntohl (msg->reserved))
964 if (ntohs (msg->header.size) <
965 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
971 /* convert address */
972 switch (sender_addr->sa_family)
975 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
976 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
977 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
982 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
983 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
984 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
993 LOG (GNUNET_ERROR_TYPE_DEBUG,
994 "Received message with %u bytes from peer `%s' at `%s'\n",
995 (unsigned int) ntohs (msg->header.size),
996 GNUNET_i2s (&msg->sender), GNUNET_a2s (sender_addr,
1000 /* create a session for inbound connections */
1001 const struct UDPMessage * udp_msg = (const struct UDPMessage *) msg;
1002 LOG (GNUNET_ERROR_TYPE_DEBUG,
1003 "Lookup inbound UDP sessions for peer `%s' address `%s'\n",
1004 GNUNET_i2s (&udp_msg->sender),
1005 udp_address_to_string(NULL, arg, args));
1007 struct Session * s = NULL;
1008 s = find_inbound_session (plugin, &udp_msg->sender, sender_addr, sender_addr_len);
1012 LOG (GNUNET_ERROR_TYPE_DEBUG,
1013 "Found existing inbound UDP sessions 0x%X for peer `%s' address `%s'\n",
1015 GNUNET_i2s (&s->target),
1016 udp_address_to_string(NULL, arg, args));
1020 s = create_session (plugin, &udp_msg->sender, arg, args, NULL, NULL);
1021 LOG (GNUNET_ERROR_TYPE_DEBUG,
1022 "Creating inbound UDP sessions 0x%X for peer `%s' address `%s'\n",
1024 GNUNET_i2s (&s->target),
1025 udp_address_to_string(NULL, arg, args));
1027 GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put (plugin->inbound_sessions,
1028 &s->target.hashPubKey,
1030 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1032 s->valid_until = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1033 if (s->invalidation_task != GNUNET_SCHEDULER_NO_TASK)
1035 GNUNET_SCHEDULER_cancel(s->invalidation_task);
1036 s->invalidation_task = GNUNET_SCHEDULER_NO_TASK;
1037 LOG (GNUNET_ERROR_TYPE_DEBUG,
1038 "Rescheduling %X' `%s'\n",
1039 s, udp_address_to_string(NULL, arg, args));
1041 s->invalidation_task = GNUNET_SCHEDULER_add_delayed(GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, &invalidation_task, s);
1042 /* iterate over all embedded messages */
1043 si.sender = msg->sender;
1047 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1048 ntohs (msg->header.size) -
1049 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1054 * Process a defragmented message.
1056 * @param cls the 'struct ReceiveContext'
1057 * @param msg the message
1060 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1062 struct ReceiveContext *rc = cls;
1064 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1069 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1074 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1075 rc->src_addr, rc->addr_len);
1080 * Transmit an acknowledgement.
1082 * @param cls the 'struct ReceiveContext'
1083 * @param id message ID (unused)
1084 * @param msg ack to transmit
1087 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1089 struct ReceiveContext *rc = cls;
1091 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1093 struct UDP_ACK_Message *udp_ack;
1097 s = find_inbound_session_by_addr (rc->plugin, rc->src_addr, rc->addr_len);
1100 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1101 delay = s->flow_delay_for_other_peer.rel_value;
1108 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending ACK to `%s' including delay of %u ms\n",
1109 GNUNET_a2s (rc->src_addr,
1110 (rc->src_addr->sa_family ==
1111 AF_INET) ? sizeof (struct sockaddr_in) :
1112 sizeof (struct sockaddr_in6)),
1115 udp_ack = (struct UDP_ACK_Message *) buf;
1116 udp_ack->header.size = htons ((uint16_t) msize);
1117 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1118 udp_ack->delay = htonl (delay);
1119 udp_ack->sender = *rc->plugin->env->my_identity;
1120 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1121 (void) udp_send (rc->plugin, rc->src_addr, &udp_ack->header);
1126 * Closure for 'find_receive_context'.
1128 struct FindReceiveContext
1131 * Where to store the result.
1133 struct ReceiveContext *rc;
1138 const struct sockaddr *addr;
1141 * Number of bytes in 'addr'.
1145 struct Session * session;
1150 * Scan the heap for a receive context with the given address.
1152 * @param cls the 'struct FindReceiveContext'
1153 * @param node internal node of the heap
1154 * @param element value stored at the node (a 'struct ReceiveContext')
1155 * @param cost cost associated with the node
1156 * @return GNUNET_YES if we should continue to iterate,
1160 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1161 void *element, GNUNET_CONTAINER_HeapCostType cost)
1163 struct FindReceiveContext *frc = cls;
1164 struct ReceiveContext *e = element;
1166 if ((frc->addr_len == e->addr_len) &&
1167 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1177 * Read and process a message from the given socket.
1179 * @param plugin the overall plugin
1180 * @param rsock socket to read from
1183 udp_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1189 const struct GNUNET_MessageHeader *msg;
1190 const struct GNUNET_MessageHeader *ack;
1191 struct Session *peer_session;
1192 const struct UDP_ACK_Message *udp_ack;
1193 struct ReceiveContext *rc;
1194 struct GNUNET_TIME_Absolute now;
1195 struct FindReceiveContext frc;
1196 struct Session * s = NULL;
1197 struct GNUNET_TIME_Relative flow_delay;
1199 fromlen = sizeof (addr);
1200 memset (&addr, 0, sizeof (addr));
1202 GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1203 (struct sockaddr *) &addr, &fromlen);
1204 if (ret < sizeof (struct GNUNET_MessageHeader))
1206 GNUNET_break_op (0);
1209 msg = (const struct GNUNET_MessageHeader *) buf;
1211 LOG (GNUNET_ERROR_TYPE_DEBUG,
1212 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) ret,
1213 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs(msg->type));
1215 if (ret != ntohs (msg->size))
1217 GNUNET_break_op (0);
1220 switch (ntohs (msg->type))
1222 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1223 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1225 GNUNET_break_op (0);
1228 process_udp_message (plugin, (const struct UDPMessage *) msg,
1229 (const struct sockaddr *) addr, fromlen);
1231 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1233 if (ntohs (msg->size) <
1234 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1236 GNUNET_break_op (0);
1239 udp_ack = (const struct UDP_ACK_Message *) msg;
1240 s = find_inbound_session(plugin, &udp_ack->sender, addr, fromlen);
1243 flow_delay.rel_value = (uint64_t) ntohl(udp_ack->delay);
1245 LOG (GNUNET_ERROR_TYPE_DEBUG,
1246 "We received a sending delay of %llu\n", flow_delay.rel_value);
1248 s->flow_delay_from_other_peer = GNUNET_TIME_relative_to_absolute (flow_delay);
1250 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1251 if (ntohs (ack->size) != ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1253 GNUNET_break_op (0);
1257 LOG (GNUNET_ERROR_TYPE_DEBUG,
1258 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1259 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1260 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1263 peer_session = find_session (plugin, &udp_ack->sender);
1264 if (NULL == peer_session)
1267 LOG (GNUNET_ERROR_TYPE_DEBUG,
1268 "Session for ACK not found, dropping ACK!\n");
1272 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (peer_session->frag, ack))
1274 GNUNET_assert (GNUNET_OK ==
1275 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
1279 plugin->last_expected_delay =
1280 GNUNET_FRAGMENT_context_destroy (peer_session->frag);
1281 if (peer_session->cont != NULL)
1282 peer_session->cont (peer_session->cont_cls, &udp_ack->sender, GNUNET_OK);
1283 GNUNET_free (peer_session);
1285 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1287 frc.addr = (const struct sockaddr *) addr;
1288 frc.addr_len = fromlen;
1289 GNUNET_CONTAINER_heap_iterate (plugin->defrags, &find_receive_context,
1291 now = GNUNET_TIME_absolute_get ();
1295 /* need to create a new RC */
1296 rc = GNUNET_malloc (sizeof (struct ReceiveContext) + fromlen);
1297 memcpy (&rc[1], addr, fromlen);
1298 rc->src_addr = (const struct sockaddr *) &rc[1];
1299 rc->addr_len = fromlen;
1300 rc->plugin = plugin;
1302 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1303 UDP_MAX_MESSAGES_IN_DEFRAG, rc,
1304 &fragment_msg_proc, &ack_proc);
1306 GNUNET_CONTAINER_heap_insert (plugin->defrags, rc,
1307 (GNUNET_CONTAINER_HeapCostType)
1311 LOG (GNUNET_ERROR_TYPE_DEBUG,
1312 "UDP processes %u-byte fragment from `%s'\n",
1313 (unsigned int) ntohs (msg->size),
1314 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1317 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (rc->defrag, msg))
1319 /* keep this 'rc' from expiring */
1320 GNUNET_CONTAINER_heap_update_cost (plugin->defrags, rc->hnode,
1321 (GNUNET_CONTAINER_HeapCostType)
1324 if (GNUNET_CONTAINER_heap_get_size (plugin->defrags) >
1325 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1327 /* remove 'rc' that was inactive the longest */
1328 rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags);
1329 GNUNET_assert (NULL != rc);
1330 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
1335 GNUNET_break_op (0);
1342 * We have been notified that our writeset has something to read. We don't
1343 * know which socket needs to be read, so we have to check each one
1344 * Then reschedule this function to be called again once more is available.
1346 * @param cls the plugin handle
1347 * @param tc the scheduling context (for rescheduling this function again)
1350 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1352 struct Plugin *plugin = cls;
1354 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1355 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1357 if ((NULL != plugin->sockv4) &&
1358 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1359 udp_read (plugin, plugin->sockv4);
1360 if ((NULL != plugin->sockv6) &&
1361 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1362 udp_read (plugin, plugin->sockv6);
1363 plugin->select_task =
1364 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1365 GNUNET_SCHEDULER_NO_TASK,
1366 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1367 NULL, &udp_plugin_select, plugin);
1373 * Read and process a message from the given socket.
1375 * @param plugin the overall plugin
1376 * @param rsock socket to read from
1379 udp_broadcast_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1385 const struct GNUNET_MessageHeader *msg;
1387 fromlen = sizeof (addr);
1388 memset (&addr, 0, sizeof (addr));
1389 ret = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1390 (struct sockaddr *) &addr, &fromlen);
1391 if (ret < sizeof (struct GNUNET_MessageHeader))
1393 GNUNET_break_op (0);
1396 msg = (const struct GNUNET_MessageHeader *) buf;
1398 LOG (GNUNET_ERROR_TYPE_ERROR,
1399 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) ret,
1400 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs(msg->type));
1402 if (ret != ntohs (msg->size))
1404 GNUNET_break_op (0);
1411 udp_broadcast_send (void *cls,
1412 const struct GNUNET_SCHEDULER_TaskContext *tc)
1414 struct Plugin * plugin = cls;
1415 struct GNUNET_MessageHeader msg;
1418 plugin->send_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
1420 struct sockaddr_in baddr;
1421 baddr.sin_family = AF_INET;
1422 baddr.sin_port = htons (plugin->broadcast_port);
1423 baddr.sin_addr.s_addr=htonl(-1); /* send message to 255.255.255.255 */
1425 msg.size = htons(sizeof (struct GNUNET_MessageHeader));
1426 msg.type = htons (500);
1428 sent = GNUNET_NETWORK_socket_sendto (plugin->sockv4_broadcast, &msg, ntohs (msg.size),
1429 (const struct sockaddr *) &baddr, sizeof (struct sockaddr_in));
1431 LOG (GNUNET_ERROR_TYPE_ERROR,
1432 "Sent broadcast with %i bytes\n", sent);
1433 plugin->send_broadcast_task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, &udp_broadcast_send, plugin);
1438 * We have been notified that our writeset has something to read. We don't
1439 * know which socket needs to be read, so we have to check each one
1440 * Then reschedule this function to be called again once more is available.
1442 * @param cls the plugin handle
1443 * @param tc the scheduling context (for rescheduling this function again)
1446 udp_plugin_broadcast_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1448 struct Plugin *plugin = cls;
1450 plugin->select_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
1451 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1454 if ((NULL != plugin->sockv4_broadcast) &&
1455 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4_broadcast)))
1456 udp_broadcast_read (plugin, plugin->sockv4_broadcast);
1458 plugin->select_broadcast_task =
1459 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1460 GNUNET_SCHEDULER_NO_TASK,
1461 GNUNET_TIME_UNIT_FOREVER_REL, plugin->broadcast_rs,
1462 NULL, &udp_plugin_broadcast_select, plugin);
1468 * Check if the given port is plausible (must be either our listen
1469 * port or our advertised port). If it is neither, we return
1472 * @param plugin global variables
1473 * @param in_port port number to check
1474 * @return GNUNET_OK if port is either open_port or adv_port
1477 check_port (struct Plugin *plugin, uint16_t in_port)
1479 if ((in_port == plugin->port) || (in_port == plugin->aport))
1481 return GNUNET_SYSERR;
1486 * Function that will be called to check if a binary address for this
1487 * plugin is well-formed and corresponds to an address for THIS peer
1488 * (as per our configuration). Naturally, if absolutely necessary,
1489 * plugins can be a bit conservative in their answer, but in general
1490 * plugins should make sure that the address does not redirect
1491 * traffic to a 3rd party that might try to man-in-the-middle our
1494 * @param cls closure, should be our handle to the Plugin
1495 * @param addr pointer to the address
1496 * @param addrlen length of addr
1497 * @return GNUNET_OK if this is a plausible address for this peer
1498 * and transport, GNUNET_SYSERR if not
1502 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1504 struct Plugin *plugin = cls;
1505 struct IPv4UdpAddress *v4;
1506 struct IPv6UdpAddress *v6;
1508 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
1509 (addrlen != sizeof (struct IPv6UdpAddress)))
1511 GNUNET_break_op (0);
1512 return GNUNET_SYSERR;
1514 if (addrlen == sizeof (struct IPv4UdpAddress))
1516 v4 = (struct IPv4UdpAddress *) addr;
1517 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
1518 return GNUNET_SYSERR;
1520 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1521 sizeof (struct in_addr)))
1522 return GNUNET_SYSERR;
1526 v6 = (struct IPv6UdpAddress *) addr;
1527 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1529 GNUNET_break_op (0);
1530 return GNUNET_SYSERR;
1532 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
1533 return GNUNET_SYSERR;
1535 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1536 sizeof (struct in6_addr)))
1537 return GNUNET_SYSERR;
1544 * Function called for a quick conversion of the binary address to
1545 * a numeric address. Note that the caller must not free the
1546 * address and that the next call to this function is allowed
1547 * to override the address again.
1549 * @param cls closure
1550 * @param addr binary address
1551 * @param addrlen length of the address
1552 * @return string representing the same address
1555 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
1557 static char rbuf[INET6_ADDRSTRLEN + 10];
1558 char buf[INET6_ADDRSTRLEN];
1562 const struct IPv4UdpAddress *t4;
1563 const struct IPv6UdpAddress *t6;
1567 if (addrlen == sizeof (struct IPv6UdpAddress))
1571 port = ntohs (t6->u6_port);
1572 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
1575 else if (addrlen == sizeof (struct IPv4UdpAddress))
1579 port = ntohs (t4->u4_port);
1580 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
1585 GNUNET_break_op (0);
1588 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
1589 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
1596 * Closure for 'append_port'.
1598 struct PrettyPrinterContext
1601 * Function to call with the result.
1603 GNUNET_TRANSPORT_AddressStringCallback asc;
1606 * Clsoure for 'asc'.
1611 * Port to add after the IP address.
1618 * Append our port and forward the result.
1620 * @param cls a 'struct PrettyPrinterContext'
1621 * @param hostname result from DNS resolver
1624 append_port (void *cls, const char *hostname)
1626 struct PrettyPrinterContext *ppc = cls;
1629 if (hostname == NULL)
1631 ppc->asc (ppc->asc_cls, NULL);
1635 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1636 ppc->asc (ppc->asc_cls, ret);
1642 * Convert the transports address to a nice, human-readable
1645 * @param cls closure
1646 * @param type name of the transport that generated the address
1647 * @param addr one of the addresses of the host, NULL for the last address
1648 * the specific address format depends on the transport
1649 * @param addrlen length of the address
1650 * @param numeric should (IP) addresses be displayed in numeric form?
1651 * @param timeout after how long should we give up?
1652 * @param asc function to call on each string
1653 * @param asc_cls closure for asc
1656 udp_plugin_address_pretty_printer (void *cls, const char *type,
1657 const void *addr, size_t addrlen,
1659 struct GNUNET_TIME_Relative timeout,
1660 GNUNET_TRANSPORT_AddressStringCallback asc,
1663 struct PrettyPrinterContext *ppc;
1666 struct sockaddr_in a4;
1667 struct sockaddr_in6 a6;
1668 const struct IPv4UdpAddress *u4;
1669 const struct IPv6UdpAddress *u6;
1672 if (addrlen == sizeof (struct IPv6UdpAddress))
1675 memset (&a6, 0, sizeof (a6));
1676 a6.sin6_family = AF_INET6;
1677 #if HAVE_SOCKADDR_IN_SIN_LEN
1678 a6.sin6_len = sizeof (a6);
1680 a6.sin6_port = u6->u6_port;
1681 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
1682 port = ntohs (u6->u6_port);
1686 else if (addrlen == sizeof (struct IPv4UdpAddress))
1689 memset (&a4, 0, sizeof (a4));
1690 a4.sin_family = AF_INET;
1691 #if HAVE_SOCKADDR_IN_SIN_LEN
1692 a4.sin_len = sizeof (a4);
1694 a4.sin_port = u4->u4_port;
1695 a4.sin_addr.s_addr = u4->ipv4_addr;
1696 port = ntohs (u4->u4_port);
1702 /* invalid address */
1703 GNUNET_break_op (0);
1704 asc (asc_cls, NULL);
1707 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1709 ppc->asc_cls = asc_cls;
1711 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
1716 * Our external IP address/port mapping has changed.
1718 * @param cls closure, the 'struct LocalAddrList'
1719 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
1720 * the previous (now invalid) one
1721 * @param addr either the previous or the new public IP address
1722 * @param addrlen actual lenght of the address
1725 udp_nat_port_map_callback (void *cls, int add_remove,
1726 const struct sockaddr *addr, socklen_t addrlen)
1728 struct Plugin *plugin = cls;
1729 struct IPv4UdpAddress u4;
1730 struct IPv6UdpAddress u6;
1734 /* convert 'addr' to our internal format */
1735 switch (addr->sa_family)
1738 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1739 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1740 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1745 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1746 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1747 sizeof (struct in6_addr));
1748 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1756 /* modify our published address list */
1757 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1762 * The exported method. Makes the core api available via a global and
1763 * returns the udp transport API.
1765 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
1766 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
1769 libgnunet_plugin_transport_udp_init (void *cls)
1771 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1772 unsigned long long port;
1773 unsigned long long aport;
1774 unsigned long long bport;
1775 struct GNUNET_TRANSPORT_PluginFunctions *api;
1776 struct Plugin *plugin;
1777 int sockets_created;
1779 struct sockaddr_in serverAddrv4;
1780 struct sockaddr_in6 serverAddrv6;
1781 struct sockaddr *serverAddr;
1782 struct sockaddr *addrs[2];
1783 socklen_t addrlens[2];
1786 unsigned long long udp_max_bps;
1789 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
1793 broadcast = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp", "BROADCAST");
1794 if (broadcast == GNUNET_SYSERR)
1795 broadcast = GNUNET_NO;
1798 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "BROADCAST_PORT",
1803 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1804 "MAX_BPS", &udp_max_bps))
1805 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
1807 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1808 "ADVERTISED_PORT", &aport))
1812 LOG (GNUNET_ERROR_TYPE_WARNING,
1813 _("Given `%s' option is out of range: %llu > %u\n"), "PORT",
1817 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1818 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1820 plugin = GNUNET_malloc (sizeof (struct Plugin));
1821 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1822 GNUNET_BANDWIDTH_value_init ((uint32_t)
1824 plugin->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
1825 plugin->port = port;
1826 plugin->aport = aport;
1827 plugin->broadcast_port = bport;
1828 plugin->broadcast = broadcast;
1830 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1833 api->send = &udp_plugin_send;
1834 api->disconnect = &udp_disconnect;
1835 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1836 api->address_to_string = &udp_address_to_string;
1837 api->check_address = &udp_plugin_check_address;
1840 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1841 "BINDTO", &plugin->bind4_address))
1843 LOG (GNUNET_ERROR_TYPE_DEBUG,
1844 "Binding udp plugin to specific address: `%s'\n",
1845 plugin->bind4_address);
1846 if (1 != inet_pton (AF_INET, plugin->bind4_address, &serverAddrv4.sin_addr))
1848 GNUNET_free (plugin->bind4_address);
1849 GNUNET_free (plugin);
1856 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1857 "BINDTO6", &plugin->bind6_address))
1859 LOG (GNUNET_ERROR_TYPE_DEBUG,
1860 "Binding udp plugin to specific address: `%s'\n",
1861 plugin->bind6_address);
1863 inet_pton (AF_INET6, plugin->bind6_address, &serverAddrv6.sin6_addr))
1865 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
1866 plugin->bind6_address);
1867 GNUNET_free_non_null (plugin->bind4_address);
1868 GNUNET_free (plugin->bind6_address);
1869 GNUNET_free (plugin);
1876 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1878 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
1880 plugin->inbound_sessions =
1881 GNUNET_CONTAINER_multihashmap_create (UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG
1883 sockets_created = 0;
1885 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "nat",
1888 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1889 if (NULL == plugin->sockv6)
1891 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1895 #if HAVE_SOCKADDR_IN_SIN_LEN
1896 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1898 serverAddrv6.sin6_family = AF_INET6;
1899 serverAddrv6.sin6_addr = in6addr_any;
1900 serverAddrv6.sin6_port = htons (plugin->port);
1901 addrlen = sizeof (serverAddrv6);
1902 serverAddr = (struct sockaddr *) &serverAddrv6;
1904 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1905 ntohs (serverAddrv6.sin6_port));
1908 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1911 serverAddrv6.sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1913 LOG (GNUNET_ERROR_TYPE_DEBUG,
1914 "IPv6 Binding failed, trying new port %d\n",
1915 ntohs (serverAddrv6.sin6_port));
1920 GNUNET_NETWORK_socket_close (plugin->sockv6);
1921 plugin->sockv6 = NULL;
1925 if (plugin->sockv6 != NULL)
1927 addrs[sockets_created] = (struct sockaddr *) &serverAddrv6;
1928 addrlens[sockets_created] = sizeof (serverAddrv6);
1935 GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
1936 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1937 if (NULL == plugin->sockv4)
1939 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1943 #if HAVE_SOCKADDR_IN_SIN_LEN
1944 serverAddrv4.sin_len = sizeof (serverAddrv4);
1946 serverAddrv4.sin_family = AF_INET;
1947 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1948 serverAddrv4.sin_port = htons (plugin->port);
1949 addrlen = sizeof (serverAddrv4);
1950 serverAddr = (struct sockaddr *) &serverAddrv4;
1952 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1953 ntohs (serverAddrv4.sin_port));
1956 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1959 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1961 LOG (GNUNET_ERROR_TYPE_DEBUG,
1962 "IPv4 Binding failed, trying new port %d\n",
1963 ntohs (serverAddrv4.sin_port));
1968 GNUNET_NETWORK_socket_close (plugin->sockv4);
1969 plugin->sockv4 = NULL;
1973 if (plugin->sockv4 != NULL)
1975 addrs[sockets_created] = (struct sockaddr *) &serverAddrv4;
1976 addrlens[sockets_created] = sizeof (serverAddrv4);
1981 plugin->rs = GNUNET_NETWORK_fdset_create ();
1982 GNUNET_NETWORK_fdset_zero (plugin->rs);
1983 if (NULL != plugin->sockv4)
1984 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv4);
1985 if (NULL != plugin->sockv6)
1986 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv6);
1988 plugin->select_task =
1989 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1990 GNUNET_SCHEDULER_NO_TASK,
1991 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1992 NULL, &udp_plugin_select, plugin);
1995 /* create broadcast socket */
1998 plugin->sockv4_broadcast = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1999 if (NULL == plugin->sockv4_broadcast)
2001 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
2005 #if HAVE_SOCKADDR_IN_SIN_LEN
2006 serverAddrv4.sin_len = sizeof (serverAddrv4);
2008 serverAddrv4.sin_family = AF_INET;
2009 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
2010 serverAddrv4.sin_port = htons (plugin->broadcast_port);
2011 addrlen = sizeof (serverAddrv4);
2012 serverAddr = (struct sockaddr *) &serverAddrv4;
2015 LOG (GNUNET_ERROR_TYPE_ERROR, "Binding Broadcast to IPv4 port %d\n",
2016 ntohs (serverAddrv4.sin_port));
2019 while (GNUNET_NETWORK_socket_bind (plugin->sockv4_broadcast, serverAddr, addrlen) != GNUNET_OK)
2021 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
2023 LOG (GNUNET_ERROR_TYPE_DEBUG,
2024 "IPv4 Binding failed, trying new port %d\n",
2025 ntohs (serverAddrv4.sin_port));
2030 GNUNET_NETWORK_socket_close (plugin->sockv4_broadcast);
2031 plugin->sockv4_broadcast = NULL;
2035 if (plugin->sockv4_broadcast != NULL)
2037 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("UDP Broadcast sockets on port %u \n"), bport);
2039 if (GNUNET_NETWORK_socket_setsockopt (plugin->sockv4_broadcast, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(int)) != GNUNET_OK)
2040 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "BROAD CASD socket");
2044 plugin->broadcast_rs = GNUNET_NETWORK_fdset_create ();
2045 if (NULL != plugin->sockv4_broadcast)
2046 GNUNET_NETWORK_fdset_set (plugin->broadcast_rs, plugin->sockv4_broadcast);
2048 plugin->select_broadcast_task =
2049 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2050 GNUNET_SCHEDULER_NO_TASK,
2051 GNUNET_TIME_UNIT_FOREVER_REL, plugin->broadcast_rs,
2052 NULL, &udp_plugin_broadcast_select, plugin);
2054 plugin->send_broadcast_task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_UNIT_SECONDS, &udp_broadcast_send, plugin);
2057 if (sockets_created == 0)
2058 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
2060 GNUNET_NAT_register (env->cfg, GNUNET_NO, port, sockets_created,
2061 (const struct sockaddr **) addrs, addrlens,
2062 &udp_nat_port_map_callback, NULL, plugin);
2067 * Shutdown the plugin.
2069 * @param cls our 'struct GNUNET_TRANSPORT_PluginFunctions'
2073 libgnunet_plugin_transport_udp_done (void *cls)
2075 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2076 struct Plugin *plugin = api->cls;
2077 struct ReceiveContext *rc;
2079 /* FIXME: clean up heap and hashmap */
2080 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &destroy_session,
2082 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
2083 plugin->sessions = NULL;
2084 GNUNET_CONTAINER_multihashmap_iterate (plugin->inbound_sessions, &destroy_inbound_session,
2086 GNUNET_CONTAINER_multihashmap_destroy (plugin->inbound_sessions);
2087 plugin->inbound_sessions = NULL;
2088 while (NULL != (rc = GNUNET_CONTAINER_heap_remove_root (plugin->defrags)))
2090 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
2093 GNUNET_CONTAINER_heap_destroy (plugin->defrags);
2095 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
2097 GNUNET_SCHEDULER_cancel (plugin->select_task);
2098 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
2100 if (plugin->sockv4 != NULL)
2102 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
2103 plugin->sockv4 = NULL;
2105 if (plugin->sockv6 != NULL)
2107 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
2108 plugin->sockv6 = NULL;
2111 if (plugin->broadcast)
2113 if (plugin->select_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
2115 GNUNET_SCHEDULER_cancel (plugin->select_broadcast_task);
2116 plugin->select_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
2118 if (plugin->send_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
2120 GNUNET_SCHEDULER_cancel (plugin->send_broadcast_task );
2121 plugin->send_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
2124 if (plugin->sockv4_broadcast != NULL)
2126 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4_broadcast));
2127 plugin->sockv4_broadcast = NULL;
2129 GNUNET_NETWORK_fdset_destroy (plugin->broadcast_rs);
2132 GNUNET_SERVER_mst_destroy (plugin->mst);
2133 GNUNET_NETWORK_fdset_destroy (plugin->rs);
2135 GNUNET_NAT_unregister (plugin->nat);
2137 GNUNET_free (plugin);
2142 /* end of plugin_transport_udp.c */