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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 transport protocol
24 * @author Christian Grothoff
25 * @author Nathan Evans
26 * @author Matthias Wachs
29 #include "plugin_transport_udp.h"
30 #include "gnunet_hello_lib.h"
31 #include "gnunet_util_lib.h"
32 #include "gnunet_fragmentation_lib.h"
33 #include "gnunet_nat_lib.h"
34 #include "gnunet_protocols.h"
35 #include "gnunet_resolver_service.h"
36 #include "gnunet_signatures.h"
37 #include "gnunet_constants.h"
38 #include "gnunet_statistics_service.h"
39 #include "gnunet_transport_service.h"
40 #include "gnunet_transport_plugin.h"
41 #include "transport.h"
43 #define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
47 * Number of messages we can defragment in parallel. We only really
48 * defragment 1 message at a time, but if messages get re-ordered, we
49 * may want to keep knowledge about the previous message to avoid
50 * discarding the current message in favor of a single fragment of a
51 * previous message. 3 should be good since we don't expect massive
52 * message reorderings with UDP.
54 #define UDP_MAX_MESSAGES_IN_DEFRAG 3
57 * We keep a defragmentation queue per sender address. How many
58 * sender addresses do we support at the same time? Memory consumption
59 * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this
60 * value. (So 128 corresponds to 12 MB and should suffice for
61 * connecting to roughly 128 peers via UDP).
63 #define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
68 * Closure for 'append_port'.
70 struct PrettyPrinterContext
73 * Function to call with the result.
75 GNUNET_TRANSPORT_AddressStringCallback asc;
83 * Port to add after the IP address.
91 * Which peer is this session for?
93 struct GNUNET_PeerIdentity target;
96 * Address of the other peer
98 const struct sockaddr *sock_addr;
103 * Desired delay for next sending we send to other peer
105 struct GNUNET_TIME_Relative flow_delay_for_other_peer;
108 * Desired delay for next sending we received from other peer
110 struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
113 * expected delay for ACKs
115 struct GNUNET_TIME_Relative last_expected_delay;
118 struct GNUNET_ATS_Information ats;
120 struct FragmentationContext * frag_ctx;
124 struct SessionCompareContext
127 const struct GNUNET_HELLO_Address *addr;
132 * Closure for 'process_inbound_tokenized_messages'
134 struct SourceInformation
139 struct GNUNET_PeerIdentity sender;
147 * Number of bytes in source address.
151 struct Session *session;
156 * Closure for 'find_receive_context'.
158 struct FindReceiveContext
161 * Where to store the result.
163 struct DefragContext *rc;
168 const struct sockaddr *addr;
171 * Number of bytes in 'addr'.
175 struct Session *session;
181 * Data structure to track defragmentation contexts based
182 * on the source of the UDP traffic.
188 * Defragmentation context.
190 struct GNUNET_DEFRAGMENT_Context *defrag;
193 * Source address this receive context is for (allocated at the
194 * end of the struct).
196 const struct sockaddr *src_addr;
199 * Reference to master plugin struct.
201 struct Plugin *plugin;
204 * Node in the defrag heap.
206 struct GNUNET_CONTAINER_HeapNode *hnode;
209 * Length of 'src_addr'
217 * Closure for 'process_inbound_tokenized_messages'
219 struct FragmentationContext
221 struct FragmentationContext * next;
222 struct FragmentationContext * prev;
224 struct Plugin * plugin;
225 struct GNUNET_FRAGMENT_Context * frag;
226 struct Session * session;
228 struct GNUNET_TIME_Absolute timeout;
232 * Function to call upon completion of the transmission.
234 GNUNET_TRANSPORT_TransmitContinuation cont;
237 * Closure for 'cont'.
241 size_t bytes_to_send;
245 struct UDPMessageWrapper
247 struct Session *session;
248 struct UDPMessageWrapper *prev;
249 struct UDPMessageWrapper *next;
253 struct GNUNET_TIME_Absolute timeout;
256 * Function to call upon completion of the transmission.
258 GNUNET_TRANSPORT_TransmitContinuation cont;
261 * Closure for 'cont'.
265 struct FragmentationContext *frag_ctx;
271 * UDP ACK Message-Packet header (after defragmentation).
273 struct UDP_ACK_Message
278 struct GNUNET_MessageHeader header;
281 * Desired delay for flow control
286 * What is the identity of the sender
288 struct GNUNET_PeerIdentity sender;
295 * Function called for a quick conversion of the binary address to
296 * a numeric address. Note that the caller must not free the
297 * address and that the next call to this function is allowed
298 * to override the address again.
301 * @param addr binary address
302 * @param addrlen length of the address
303 * @return string representing the same address
306 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
308 static char rbuf[INET6_ADDRSTRLEN + 10];
309 char buf[INET6_ADDRSTRLEN];
313 const struct IPv4UdpAddress *t4;
314 const struct IPv6UdpAddress *t6;
318 if (addrlen == sizeof (struct IPv6UdpAddress))
322 port = ntohs (t6->u6_port);
323 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
326 else if (addrlen == sizeof (struct IPv4UdpAddress))
330 port = ntohs (t4->u4_port);
331 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
339 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
340 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
347 * Append our port and forward the result.
349 * @param cls a 'struct PrettyPrinterContext'
350 * @param hostname result from DNS resolver
353 append_port (void *cls, const char *hostname)
355 struct PrettyPrinterContext *ppc = cls;
358 if (hostname == NULL)
360 ppc->asc (ppc->asc_cls, NULL);
364 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
365 ppc->asc (ppc->asc_cls, ret);
371 * Convert the transports address to a nice, human-readable
375 * @param type name of the transport that generated the address
376 * @param addr one of the addresses of the host, NULL for the last address
377 * the specific address format depends on the transport
378 * @param addrlen length of the address
379 * @param numeric should (IP) addresses be displayed in numeric form?
380 * @param timeout after how long should we give up?
381 * @param asc function to call on each string
382 * @param asc_cls closure for asc
385 udp_plugin_address_pretty_printer (void *cls, const char *type,
386 const void *addr, size_t addrlen,
388 struct GNUNET_TIME_Relative timeout,
389 GNUNET_TRANSPORT_AddressStringCallback asc,
392 struct PrettyPrinterContext *ppc;
395 struct sockaddr_in a4;
396 struct sockaddr_in6 a6;
397 const struct IPv4UdpAddress *u4;
398 const struct IPv6UdpAddress *u6;
401 if (addrlen == sizeof (struct IPv6UdpAddress))
404 memset (&a6, 0, sizeof (a6));
405 a6.sin6_family = AF_INET6;
406 #if HAVE_SOCKADDR_IN_SIN_LEN
407 a6.sin6_len = sizeof (a6);
409 a6.sin6_port = u6->u6_port;
410 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
411 port = ntohs (u6->u6_port);
415 else if (addrlen == sizeof (struct IPv4UdpAddress))
418 memset (&a4, 0, sizeof (a4));
419 a4.sin_family = AF_INET;
420 #if HAVE_SOCKADDR_IN_SIN_LEN
421 a4.sin_len = sizeof (a4);
423 a4.sin_port = u4->u4_port;
424 a4.sin_addr.s_addr = u4->ipv4_addr;
425 port = ntohs (u4->u4_port);
431 /* invalid address */
436 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
438 ppc->asc_cls = asc_cls;
440 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
445 * Check if the given port is plausible (must be either our listen
446 * port or our advertised port). If it is neither, we return
449 * @param plugin global variables
450 * @param in_port port number to check
451 * @return GNUNET_OK if port is either open_port or adv_port
454 check_port (struct Plugin *plugin, uint16_t in_port)
456 if ((in_port == plugin->port) || (in_port == plugin->aport))
458 return GNUNET_SYSERR;
464 * Function that will be called to check if a binary address for this
465 * plugin is well-formed and corresponds to an address for THIS peer
466 * (as per our configuration). Naturally, if absolutely necessary,
467 * plugins can be a bit conservative in their answer, but in general
468 * plugins should make sure that the address does not redirect
469 * traffic to a 3rd party that might try to man-in-the-middle our
472 * @param cls closure, should be our handle to the Plugin
473 * @param addr pointer to the address
474 * @param addrlen length of addr
475 * @return GNUNET_OK if this is a plausible address for this peer
476 * and transport, GNUNET_SYSERR if not
480 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
482 struct Plugin *plugin = cls;
483 struct IPv4UdpAddress *v4;
484 struct IPv6UdpAddress *v6;
486 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
487 (addrlen != sizeof (struct IPv6UdpAddress)))
490 return GNUNET_SYSERR;
492 if (addrlen == sizeof (struct IPv4UdpAddress))
494 v4 = (struct IPv4UdpAddress *) addr;
495 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
496 return GNUNET_SYSERR;
498 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
499 sizeof (struct in_addr)))
500 return GNUNET_SYSERR;
504 v6 = (struct IPv6UdpAddress *) addr;
505 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
508 return GNUNET_SYSERR;
510 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
511 return GNUNET_SYSERR;
513 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
514 sizeof (struct in6_addr)))
515 return GNUNET_SYSERR;
522 * Destroy a session, plugin is being unloaded.
525 * @param key hash of public key of target peer
526 * @param value a 'struct PeerSession*' to clean up
527 * @return GNUNET_OK (continue to iterate)
530 disconnect_and_free_it (void *cls, const GNUNET_HashCode * key, void *value)
532 struct Plugin *plugin = cls;
533 struct Session *s = value;
534 struct UDPMessageWrapper *udpw;
535 struct UDPMessageWrapper *next;
538 LOG (GNUNET_ERROR_TYPE_DEBUG,
539 "Session %p to peer `%s' address ended \n",
541 GNUNET_i2s (&s->target),
542 GNUNET_a2s (s->sock_addr, s->addrlen));
545 if (s->frag_ctx != NULL)
547 GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag);
548 GNUNET_free (s->frag_ctx);
552 udpw = plugin->ipv4_queue_head;
556 if (udpw->session == s)
558 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
560 if (udpw->cont != NULL)
561 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
567 udpw = plugin->ipv6_queue_head;
571 if (udpw->session == s)
573 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
575 if (udpw->cont != NULL)
576 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
582 plugin->env->session_end (plugin->env->cls, &s->target, s);
584 GNUNET_assert (GNUNET_YES ==
585 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
586 &s->target.hashPubKey,
596 * Disconnect from a remote node. Clean up session if we have one for this peer
598 * @param cls closure for this call (should be handle to Plugin)
599 * @param target the peeridentity of the peer to disconnect
600 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
603 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
605 struct Plugin *plugin = cls;
606 GNUNET_assert (plugin != NULL);
608 GNUNET_assert (target != NULL);
610 LOG (GNUNET_ERROR_TYPE_DEBUG,
611 "Disconnecting from peer `%s'\n", GNUNET_i2s (target));
613 /* Clean up sessions */
614 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin);
617 static struct Session *
618 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
619 const void *addr, size_t addrlen,
620 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
623 const struct IPv4UdpAddress *t4;
624 const struct IPv6UdpAddress *t6;
625 struct sockaddr_in *v4;
626 struct sockaddr_in6 *v6;
631 case sizeof (struct IPv4UdpAddress):
632 if (NULL == plugin->sockv4)
637 s = GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in));
638 len = sizeof (struct sockaddr_in);
639 v4 = (struct sockaddr_in *) &s[1];
640 v4->sin_family = AF_INET;
641 #if HAVE_SOCKADDR_IN_SIN_LEN
642 v4->sin_len = sizeof (struct sockaddr_in);
644 v4->sin_port = t4->u4_port;
645 v4->sin_addr.s_addr = t4->ipv4_addr;
646 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v4, sizeof (struct sockaddr_in));
648 case sizeof (struct IPv6UdpAddress):
649 if (NULL == plugin->sockv6)
655 GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6));
656 len = sizeof (struct sockaddr_in6);
657 v6 = (struct sockaddr_in6 *) &s[1];
658 v6->sin6_family = AF_INET6;
659 #if HAVE_SOCKADDR_IN_SIN_LEN
660 v6->sin6_len = sizeof (struct sockaddr_in6);
662 v6->sin6_port = t6->u6_port;
663 v6->sin6_addr = t6->ipv6_addr;
664 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v6, sizeof (struct sockaddr_in6));
667 /* Must have a valid address to send to */
674 s->sock_addr = (const struct sockaddr *) &s[1];
675 s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero();
676 s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero();
677 s->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
682 static int session_cmp_it (void *cls,
683 const GNUNET_HashCode * key,
686 struct SessionCompareContext * cctx = cls;
687 const struct GNUNET_HELLO_Address *address = cctx->addr;
688 struct Session *s = value;
690 socklen_t s_addrlen = s->addrlen;
693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing address %s <-> %s\n",
694 udp_address_to_string (NULL, (void *) address->address, address->address_length),
695 GNUNET_a2s (s->sock_addr, s->addrlen));
698 if ((address->address_length == sizeof (struct IPv4UdpAddress)) &&
699 (s_addrlen == sizeof (struct sockaddr_in)))
701 struct IPv4UdpAddress * u4 = NULL;
702 u4 = (struct IPv4UdpAddress *) address->address;
703 const struct sockaddr_in *s4 = (const struct sockaddr_in *) s->sock_addr;
704 if ((0 == memcmp ((const void *) &u4->ipv4_addr,(const void *) &s4->sin_addr, sizeof (struct in_addr))) &&
705 (u4->u4_port == s4->sin_port))
712 if ((address->address_length == sizeof (struct IPv6UdpAddress)) &&
713 (s_addrlen == sizeof (struct sockaddr_in6)))
715 struct IPv6UdpAddress * u6 = NULL;
716 u6 = (struct IPv6UdpAddress *) address->address;
717 const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) s->sock_addr;
718 if ((0 == memcmp (&u6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr))) &&
719 (u6->u6_port == s6->sin6_port))
732 * Creates a new outbound session the transport service will use to send data to the
735 * @param cls the plugin
736 * @param address the address
737 * @return the session or NULL of max connections exceeded
739 static struct Session *
740 udp_plugin_get_session (void *cls,
741 const struct GNUNET_HELLO_Address *address)
743 struct Session * s = NULL;
744 struct Plugin * plugin = cls;
746 GNUNET_assert (plugin != NULL);
747 GNUNET_assert (address != NULL);
749 if ((address->address == NULL) ||
750 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
751 (address->address_length != sizeof (struct IPv6UdpAddress))))
757 /* check if session already exists */
758 struct SessionCompareContext cctx;
762 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Looking for existing session for peer `%s' `%s' \n", GNUNET_i2s (&address->peer), udp_address_to_string(NULL, address->address, address->address_length));
764 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx);
765 if (cctx.res != NULL)
768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res);
773 /* otherwise create new */
774 s = create_session (plugin,
777 address->address_length,
780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
781 "Creating new session %p for peer `%s' address `%s'\n",
783 GNUNET_i2s(&address->peer),
784 udp_address_to_string(NULL,address->address,address->address_length));
786 GNUNET_assert (GNUNET_OK ==
787 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
788 &s->target.hashPubKey,
790 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
795 static void enqueue (struct Plugin *plugin, struct UDPMessageWrapper * udpw)
798 if (udpw->session->addrlen == sizeof (struct sockaddr_in))
799 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
800 if (udpw->session->addrlen == sizeof (struct sockaddr_in6))
801 GNUNET_CONTAINER_DLL_insert(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
805 * Function that is called with messages created by the fragmentation
806 * module. In the case of the 'proc' callback of the
807 * GNUNET_FRAGMENT_context_create function, this function must
808 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
810 * @param cls closure, the 'struct FragmentationContext'
811 * @param msg the message that was created
814 enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
816 struct FragmentationContext *frag_ctx = cls;
817 struct Plugin *plugin = frag_ctx->plugin;
818 struct UDPMessageWrapper * udpw;
820 size_t msg_len = ntohs (msg->size);
823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper));
826 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msg_len);
827 udpw->session = frag_ctx->session;
828 udpw->udp = (char *) &udpw[1];
830 udpw->msg_size = msg_len;
831 udpw->cont = frag_ctx->cont;
832 udpw->cont_cls = frag_ctx->cont_cls;
833 udpw->timeout = frag_ctx->timeout;
834 udpw->frag_ctx = frag_ctx;
835 memcpy (udpw->udp, msg, msg_len);
837 enqueue (plugin, udpw);
843 * Function that can be used by the transport service to transmit
844 * a message using the plugin. Note that in the case of a
845 * peer disconnecting, the continuation MUST be called
846 * prior to the disconnect notification itself. This function
847 * will be called with this peer's HELLO message to initiate
848 * a fresh connection to another peer.
851 * @param s which session must be used
852 * @param msgbuf the message to transmit
853 * @param msgbuf_size number of bytes in 'msgbuf'
854 * @param priority how important is the message (most plugins will
855 * ignore message priority and just FIFO)
856 * @param to how long to wait at most for the transmission (does not
857 * require plugins to discard the message after the timeout,
858 * just advisory for the desired delay; most plugins will ignore
860 * @param cont continuation to call once the message has
861 * been transmitted (or if the transport is ready
862 * for the next transmission call; or if the
863 * peer disconnected...); can be NULL
864 * @param cont_cls closure for cont
865 * @return number of bytes used (on the physical network, with overheads);
866 * -1 on hard errors (i.e. address invalid); 0 is a legal value
867 * and does NOT mean that the message was not transmitted (DV)
870 udp_plugin_send (void *cls,
872 const char *msgbuf, size_t msgbuf_size,
873 unsigned int priority,
874 struct GNUNET_TIME_Relative to,
875 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
877 struct Plugin *plugin = cls;
878 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
880 struct UDPMessageWrapper * udpw;
881 struct UDPMessage *udp;
883 GNUNET_assert (plugin != NULL);
884 GNUNET_assert (s != NULL);
886 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
889 return GNUNET_SYSERR;
892 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessions, &s->target.hashPubKey, s))
895 return GNUNET_SYSERR;
898 LOG (GNUNET_ERROR_TYPE_DEBUG,
899 "UDP transmits %u-byte message to `%s' using address `%s'\n",
901 GNUNET_i2s (&s->target),
902 GNUNET_a2s(s->sock_addr, s->addrlen));
905 udp = (struct UDPMessage *) mbuf;
906 udp->header.size = htons (mlen);
907 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
908 udp->reserved = htonl (0);
909 udp->sender = *plugin->env->my_identity;
913 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + mlen);
915 udpw->udp = (char *) &udpw[1];
916 udpw->msg_size = mlen;
917 udpw->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
919 udpw->cont_cls = cont_cls;
920 udpw->frag_ctx = NULL;
922 memcpy (udpw->udp, udp, sizeof (struct UDPMessage));
923 memcpy (&udpw->udp[sizeof (struct UDPMessage)], msgbuf, msgbuf_size);
925 enqueue (plugin, udpw);
929 LOG (GNUNET_ERROR_TYPE_DEBUG,
930 "UDP has to fragment message \n");
931 if (s->frag_ctx != NULL)
932 return GNUNET_SYSERR;
933 memcpy (&udp[1], msgbuf, msgbuf_size);
934 struct FragmentationContext * frag_ctx = GNUNET_malloc(sizeof (struct FragmentationContext));
936 frag_ctx->plugin = plugin;
937 frag_ctx->session = s;
938 frag_ctx->cont = cont;
939 frag_ctx->cont_cls = cont_cls;
940 frag_ctx->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
941 frag_ctx->bytes_to_send = mlen;
942 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
945 s->last_expected_delay,
950 s->frag_ctx = frag_ctx;
958 * Our external IP address/port mapping has changed.
960 * @param cls closure, the 'struct LocalAddrList'
961 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
962 * the previous (now invalid) one
963 * @param addr either the previous or the new public IP address
964 * @param addrlen actual lenght of the address
967 udp_nat_port_map_callback (void *cls, int add_remove,
968 const struct sockaddr *addr, socklen_t addrlen)
970 struct Plugin *plugin = cls;
971 struct IPv4UdpAddress u4;
972 struct IPv6UdpAddress u6;
976 /* convert 'addr' to our internal format */
977 switch (addr->sa_family)
980 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
981 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
982 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
987 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
988 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
989 sizeof (struct in6_addr));
990 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
998 /* modify our published address list */
999 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1005 * Message tokenizer has broken up an incomming message. Pass it on
1008 * @param cls the 'struct Plugin'
1009 * @param client the 'struct SourceInformation'
1010 * @param hdr the actual message
1013 process_inbound_tokenized_messages (void *cls, void *client,
1014 const struct GNUNET_MessageHeader *hdr)
1016 struct Plugin *plugin = cls;
1017 struct SourceInformation *si = client;
1018 struct GNUNET_ATS_Information ats[2];
1019 struct GNUNET_TIME_Relative delay;
1021 GNUNET_assert (si->session != NULL);
1023 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1024 ats[0].value = htonl (1);
1025 ats[1] = si->session->ats;
1026 GNUNET_break (ntohl(ats[1].value) != GNUNET_ATS_NET_UNSPECIFIED);
1028 delay = plugin->env->receive (plugin->env->cls,
1031 (const struct GNUNET_ATS_Information *) &ats, 2,
1035 si->session->flow_delay_for_other_peer = delay;
1040 * We've received a UDP Message. Process it (pass contents to main service).
1042 * @param plugin plugin context
1043 * @param msg the message
1044 * @param sender_addr sender address
1045 * @param sender_addr_len number of bytes in sender_addr
1048 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
1049 const struct sockaddr *sender_addr,
1050 socklen_t sender_addr_len)
1052 struct SourceInformation si;
1053 struct Session * s = NULL;
1054 struct IPv4UdpAddress u4;
1055 struct IPv6UdpAddress u6;
1059 if (0 != ntohl (msg->reserved))
1061 GNUNET_break_op (0);
1064 if (ntohs (msg->header.size) <
1065 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
1067 GNUNET_break_op (0);
1071 /* convert address */
1072 switch (sender_addr->sa_family)
1075 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
1076 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
1077 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1082 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
1083 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
1084 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
1093 LOG (GNUNET_ERROR_TYPE_DEBUG,
1094 "Received message with %u bytes from peer `%s' at `%s'\n",
1095 (unsigned int) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1096 GNUNET_a2s (sender_addr, sender_addr_len));
1099 struct GNUNET_HELLO_Address * address = GNUNET_HELLO_address_allocate(&msg->sender, "udp", arg, args);
1100 s = udp_plugin_get_session(plugin, address);
1101 GNUNET_free (address);
1103 /* iterate over all embedded messages */
1105 si.sender = msg->sender;
1109 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1110 ntohs (msg->header.size) -
1111 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1116 * Scan the heap for a receive context with the given address.
1118 * @param cls the 'struct FindReceiveContext'
1119 * @param node internal node of the heap
1120 * @param element value stored at the node (a 'struct ReceiveContext')
1121 * @param cost cost associated with the node
1122 * @return GNUNET_YES if we should continue to iterate,
1126 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1127 void *element, GNUNET_CONTAINER_HeapCostType cost)
1129 struct FindReceiveContext *frc = cls;
1130 struct DefragContext *e = element;
1132 if ((frc->addr_len == e->addr_len) &&
1133 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1143 * Process a defragmented message.
1145 * @param cls the 'struct ReceiveContext'
1146 * @param msg the message
1149 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1151 struct DefragContext *rc = cls;
1153 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1158 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1163 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1164 rc->src_addr, rc->addr_len);
1167 struct LookupContext
1169 const struct sockaddr * addr;
1172 struct Session *res;
1176 lookup_session_by_addr_it (void *cls, const GNUNET_HashCode * key, void *value)
1178 struct LookupContext *l_ctx = cls;
1179 struct Session * s = value;
1181 if ((s->addrlen == l_ctx->addrlen) &&
1182 (0 == memcmp (s->sock_addr, l_ctx->addr, s->addrlen)))
1191 * Transmit an acknowledgement.
1193 * @param cls the 'struct ReceiveContext'
1194 * @param id message ID (unused)
1195 * @param msg ack to transmit
1198 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1200 struct DefragContext *rc = cls;
1202 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1203 struct UDP_ACK_Message *udp_ack;
1205 struct UDPMessageWrapper *udpw;
1208 struct LookupContext l_ctx;
1209 l_ctx.addr = rc->src_addr;
1210 l_ctx.addrlen = rc->addr_len;
1212 GNUNET_CONTAINER_multihashmap_iterate (rc->plugin->sessions,
1213 &lookup_session_by_addr_it,
1217 GNUNET_assert (s != NULL);
1219 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1220 delay = s->flow_delay_for_other_peer.rel_value;
1223 LOG (GNUNET_ERROR_TYPE_DEBUG,
1224 "Sending ACK to `%s' including delay of %u ms\n",
1225 GNUNET_a2s (rc->src_addr,
1226 (rc->src_addr->sa_family ==
1227 AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct
1231 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msize);
1233 udpw->cont_cls = NULL;
1234 udpw->frag_ctx = NULL;
1235 udpw->msg_size = msize;
1237 udpw->timeout = GNUNET_TIME_absolute_get_forever();
1238 udpw->udp = (char *)&udpw[1];
1240 udp_ack = (struct UDP_ACK_Message *) udpw->udp;
1241 udp_ack->header.size = htons ((uint16_t) msize);
1242 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1243 udp_ack->delay = htonl (delay);
1244 udp_ack->sender = *rc->plugin->env->my_identity;
1245 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1247 enqueue (rc->plugin, udpw);
1251 static void read_process_msg (struct Plugin *plugin,
1252 const struct GNUNET_MessageHeader *msg,
1256 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1258 GNUNET_break_op (0);
1261 process_udp_message (plugin, (const struct UDPMessage *) msg,
1262 (const struct sockaddr *) addr, fromlen);
1266 static void read_process_ack (struct Plugin *plugin,
1267 const struct GNUNET_MessageHeader *msg,
1271 const struct GNUNET_MessageHeader *ack;
1272 const struct UDP_ACK_Message *udp_ack;
1273 struct LookupContext l_ctx;
1274 struct Session *s = NULL;
1275 struct GNUNET_TIME_Relative flow_delay;
1277 if (ntohs (msg->size) <
1278 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1280 GNUNET_break_op (0);
1284 udp_ack = (const struct UDP_ACK_Message *) msg;
1286 l_ctx.addr = (const struct sockaddr *) addr;
1287 l_ctx.addrlen = fromlen;
1289 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions,
1290 &lookup_session_by_addr_it,
1294 if ((s == NULL) || (s->frag_ctx == NULL))
1297 flow_delay.rel_value = (uint64_t) ntohl (udp_ack->delay);
1298 LOG (GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %llu\n",
1299 flow_delay.rel_value);
1300 s->flow_delay_from_other_peer =
1301 GNUNET_TIME_relative_to_absolute (flow_delay);
1303 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1304 if (ntohs (ack->size) !=
1305 ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1307 GNUNET_break_op (0);
1311 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack))
1314 LOG (GNUNET_ERROR_TYPE_DEBUG,
1315 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1316 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1317 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1323 LOG (GNUNET_ERROR_TYPE_DEBUG,
1324 "FULL MESSAGE ACKed\n",
1325 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1326 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1328 s->last_expected_delay = GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag);
1330 struct UDPMessageWrapper * udpw = NULL;
1331 if (s->addrlen == sizeof (struct sockaddr_in6))
1333 udpw = plugin->ipv6_queue_head;
1336 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1338 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1344 if (s->addrlen == sizeof (struct sockaddr_in))
1346 udpw = plugin->ipv4_queue_head;
1349 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1351 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1358 if (s->frag_ctx->cont != NULL)
1360 (s->frag_ctx->cont_cls, &udp_ack->sender, GNUNET_OK);
1361 GNUNET_free (s->frag_ctx);
1366 static void read_process_fragment (struct Plugin *plugin,
1367 const struct GNUNET_MessageHeader *msg,
1371 struct DefragContext *d_ctx;
1372 struct GNUNET_TIME_Absolute now;
1373 struct FindReceiveContext frc;
1377 frc.addr = (const struct sockaddr *) addr;
1378 frc.addr_len = fromlen;
1381 LOG (GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
1382 (unsigned int) ntohs (msg->size),
1383 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1386 /* Lookup existing receive context for this address */
1387 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1388 &find_receive_context,
1390 now = GNUNET_TIME_absolute_get ();
1395 /* Create a new defragmentation context */
1396 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + fromlen);
1397 memcpy (&d_ctx[1], addr, fromlen);
1398 d_ctx->src_addr = (const struct sockaddr *) &d_ctx[1];
1399 d_ctx->addr_len = fromlen;
1400 d_ctx->plugin = plugin;
1402 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1403 UDP_MAX_MESSAGES_IN_DEFRAG, d_ctx,
1404 &fragment_msg_proc, &ack_proc);
1406 GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, d_ctx,
1407 (GNUNET_CONTAINER_HeapCostType)
1410 LOG (GNUNET_ERROR_TYPE_DEBUG, "Created new defragmentation context for %u-byte fragment from `%s'\n",
1411 (unsigned int) ntohs (msg->size),
1412 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1418 LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing defragmentation context for %u-byte fragment from `%s'\n",
1419 (unsigned int) ntohs (msg->size),
1420 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1424 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
1426 /* keep this 'rc' from expiring */
1427 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs, d_ctx->hnode,
1428 (GNUNET_CONTAINER_HeapCostType)
1431 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
1432 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1434 /* remove 'rc' that was inactive the longest */
1435 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
1436 GNUNET_assert (NULL != d_ctx);
1437 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1438 GNUNET_free (d_ctx);
1443 * Read and process a message from the given socket.
1445 * @param plugin the overall plugin
1446 * @param rsock socket to read from
1449 udp_select_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1455 const struct GNUNET_MessageHeader *msg;
1457 fromlen = sizeof (addr);
1458 memset (&addr, 0, sizeof (addr));
1459 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1460 (struct sockaddr *) &addr, &fromlen);
1462 if (size < sizeof (struct GNUNET_MessageHeader))
1464 GNUNET_break_op (0);
1467 msg = (const struct GNUNET_MessageHeader *) buf;
1469 LOG (GNUNET_ERROR_TYPE_DEBUG,
1470 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) size,
1471 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs (msg->type));
1473 if (size != ntohs (msg->size))
1475 GNUNET_break_op (0);
1479 switch (ntohs (msg->type))
1481 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
1482 udp_broadcast_receive (plugin, &buf, size, addr, fromlen);
1485 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1486 read_process_msg (plugin, msg, addr, fromlen);
1489 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1490 read_process_ack (plugin, msg, addr, fromlen);;
1493 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1494 read_process_fragment (plugin, msg, addr, fromlen);
1498 GNUNET_break_op (0);
1504 udp_select_send (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *sock)
1508 struct GNUNET_TIME_Absolute max;
1509 struct GNUNET_TIME_Absolute ;
1511 struct UDPMessageWrapper *udpw = NULL;
1513 if (sock == plugin->sockv4)
1515 udpw = plugin->ipv4_queue_head;
1517 else if (sock == plugin->sockv6)
1519 udpw = plugin->ipv6_queue_head;
1524 const struct sockaddr * sa = udpw->session->sock_addr;
1525 slen = udpw->session->addrlen;
1527 max = GNUNET_TIME_absolute_max(udpw->timeout, GNUNET_TIME_absolute_get());
1529 while (udpw != NULL)
1531 if (max.abs_value != udpw->timeout.abs_value)
1533 /* Message timed out */
1535 if (udpw->cont != NULL)
1536 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1537 if (udpw->frag_ctx != NULL)
1540 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Fragmented message for peer `%s' with size %u timed out\n",
1541 GNUNET_i2s(&udpw->session->target), udpw->frag_ctx->bytes_to_send);
1543 udpw->session->last_expected_delay = GNUNET_FRAGMENT_context_destroy(udpw->frag_ctx->frag);
1544 GNUNET_free (udpw->frag_ctx);
1545 udpw->session->frag_ctx = NULL;
1550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' with size %u timed out\n",
1551 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1555 if (sock == plugin->sockv4)
1557 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1559 udpw = plugin->ipv4_queue_head;
1561 else if (sock == plugin->sockv6)
1563 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1565 udpw = plugin->ipv6_queue_head;
1570 struct GNUNET_TIME_Relative delta = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
1571 if (delta.rel_value == 0)
1573 /* this message is not delayed */
1574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is not delayed \n",
1575 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1580 /* this message is delayed, try next */
1581 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is delayed for %llu \n",
1582 GNUNET_i2s(&udpw->session->target), udpw->msg_size,
1592 /* No message left */
1596 sent = GNUNET_NETWORK_socket_sendto (sock, udpw->udp, udpw->msg_size, sa, slen);
1598 if (GNUNET_SYSERR == sent)
1600 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
1601 LOG (GNUNET_ERROR_TYPE_DEBUG,
1602 "UDP transmitted %u-byte message to %s (%d: %s)\n",
1603 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1604 (sent < 0) ? STRERROR (errno) : "ok");
1605 if (udpw->cont != NULL)
1606 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1608 LOG (GNUNET_ERROR_TYPE_DEBUG,
1609 "UDP transmitted %u-byte message to %s (%d: %s)\n",
1610 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1611 (sent < 0) ? STRERROR (errno) : "ok");
1613 /* This was just a message fragment */
1614 if (udpw->frag_ctx != NULL)
1616 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1618 /* This was a complete message*/
1621 if (udpw->cont != NULL)
1622 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_OK);
1625 if (sock == plugin->sockv4)
1626 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1627 else if (sock == plugin->sockv6)
1628 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1636 * We have been notified that our readset has something to read. We don't
1637 * know which socket needs to be read, so we have to check each one
1638 * Then reschedule this function to be called again once more is available.
1640 * @param cls the plugin handle
1641 * @param tc the scheduling context (for rescheduling this function again)
1644 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1646 struct Plugin *plugin = cls;
1648 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1649 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1652 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1654 if ((NULL != plugin->sockv4) &&
1655 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1656 udp_select_read (plugin, plugin->sockv4);
1657 if ((NULL != plugin->sockv6) &&
1658 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1659 udp_select_read (plugin, plugin->sockv6);
1662 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1664 if ((NULL != plugin->sockv4) && (plugin->ipv4_queue_head != NULL) &&
1665 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv4)))
1667 udp_select_send (plugin, plugin->sockv4);
1669 if ((NULL != plugin->sockv6) && (plugin->ipv6_queue_head != NULL) &&
1670 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv6)))
1672 udp_select_send (plugin, plugin->sockv6);
1676 plugin->select_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1677 GNUNET_SCHEDULER_NO_TASK,
1678 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1679 plugin->ws, &udp_plugin_select, plugin);
1685 setup_sockets (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
1688 int sockets_created = 0;
1689 struct sockaddr *serverAddr;
1690 struct sockaddr *addrs[2];
1691 socklen_t addrlens[2];
1694 /* Create IPv6 socket */
1695 if (plugin->enable_ipv6 == GNUNET_YES)
1697 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1698 if (NULL == plugin->sockv6)
1700 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Disabling IPv6 since it is not supported on this system!\n");
1701 plugin->enable_ipv6 = GNUNET_NO;
1705 #if HAVE_SOCKADDR_IN_SIN_LEN
1706 serverAddrv6->sin6_len = sizeof (serverAddrv6);
1708 serverAddrv6->sin6_family = AF_INET6;
1709 serverAddrv6->sin6_addr = in6addr_any;
1710 serverAddrv6->sin6_port = htons (plugin->port);
1711 addrlen = sizeof (struct sockaddr_in6);
1712 serverAddr = (struct sockaddr *) serverAddrv6;
1714 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1715 ntohs (serverAddrv6->sin6_port));
1718 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1721 serverAddrv6->sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1723 LOG (GNUNET_ERROR_TYPE_DEBUG,
1724 "IPv6 Binding failed, trying new port %d\n",
1725 ntohs (serverAddrv6->sin6_port));
1730 GNUNET_NETWORK_socket_close (plugin->sockv6);
1731 plugin->sockv6 = NULL;
1735 if (plugin->sockv6 != NULL)
1738 LOG (GNUNET_ERROR_TYPE_DEBUG,
1739 "IPv6 socket created on port %d\n",
1740 ntohs (serverAddrv6->sin6_port));
1742 addrs[sockets_created] = (struct sockaddr *) serverAddrv6;
1743 addrlens[sockets_created] = sizeof (struct sockaddr_in6);
1749 /* Create IPv4 socket */
1750 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1751 if (NULL == plugin->sockv4)
1753 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1757 #if HAVE_SOCKADDR_IN_SIN_LEN
1758 serverAddrv4->sin_len = sizeof (serverAddrv4);
1760 serverAddrv4->sin_family = AF_INET;
1761 serverAddrv4->sin_addr.s_addr = INADDR_ANY;
1762 serverAddrv4->sin_port = htons (plugin->port);
1763 addrlen = sizeof (struct sockaddr_in);
1764 serverAddr = (struct sockaddr *) serverAddrv4;
1767 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1768 ntohs (serverAddrv4->sin_port));
1771 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1774 serverAddrv4->sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1776 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
1777 ntohs (serverAddrv4->sin_port));
1782 GNUNET_NETWORK_socket_close (plugin->sockv4);
1783 plugin->sockv4 = NULL;
1787 if (plugin->sockv4 != NULL)
1789 addrs[sockets_created] = (struct sockaddr *) serverAddrv4;
1790 addrlens[sockets_created] = sizeof (struct sockaddr_in);
1795 /* Create file descriptors */
1796 plugin->rs = GNUNET_NETWORK_fdset_create ();
1797 plugin->ws = GNUNET_NETWORK_fdset_create ();
1798 GNUNET_NETWORK_fdset_zero (plugin->rs);
1799 GNUNET_NETWORK_fdset_zero (plugin->ws);
1800 if (NULL != plugin->sockv4)
1802 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv4);
1803 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->sockv4);
1805 if (NULL != plugin->sockv6)
1807 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv6);
1808 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->sockv6);
1811 if (sockets_created == 0)
1812 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
1814 plugin->select_task =
1815 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1816 GNUNET_SCHEDULER_NO_TASK,
1817 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1818 plugin->ws, &udp_plugin_select, plugin);
1820 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
1821 GNUNET_NO, plugin->port,
1823 (const struct sockaddr **) addrs, addrlens,
1824 &udp_nat_port_map_callback, NULL, plugin);
1826 return sockets_created;
1831 * The exported method. Makes the core api available via a global and
1832 * returns the udp transport API.
1834 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
1835 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
1838 libgnunet_plugin_transport_udp_init (void *cls)
1840 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1841 struct GNUNET_TRANSPORT_PluginFunctions *api;
1842 struct Plugin *plugin;
1844 unsigned long long port;
1845 unsigned long long aport;
1846 unsigned long long broadcast;
1847 unsigned long long udp_max_bps;
1848 unsigned long long enable_v6;
1849 char * bind4_address;
1850 char * bind6_address;
1851 struct GNUNET_TIME_Relative interval;
1853 struct sockaddr_in serverAddrv4;
1854 struct sockaddr_in6 serverAddrv6;
1858 /* Get port number */
1860 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
1864 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1865 "ADVERTISED_PORT", &aport))
1869 LOG (GNUNET_ERROR_TYPE_WARNING,
1870 _("Given `%s' option is out of range: %llu > %u\n"), "PORT", port,
1877 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat",
1880 enable_v6 = GNUNET_NO;
1883 enable_v6 = GNUNET_YES;
1887 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1888 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1891 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1892 "BINDTO", &bind4_address))
1894 LOG (GNUNET_ERROR_TYPE_DEBUG,
1895 "Binding udp plugin to specific address: `%s'\n",
1897 if (1 != inet_pton (AF_INET, bind4_address, &serverAddrv4.sin_addr))
1899 GNUNET_free (bind4_address);
1905 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1906 "BINDTO6", &bind6_address))
1908 LOG (GNUNET_ERROR_TYPE_DEBUG,
1909 "Binding udp plugin to specific address: `%s'\n",
1912 inet_pton (AF_INET6, bind6_address, &serverAddrv6.sin6_addr))
1914 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
1916 GNUNET_free_non_null (bind4_address);
1917 GNUNET_free (bind6_address);
1923 /* Enable neighbour discovery */
1924 broadcast = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp",
1926 if (broadcast == GNUNET_SYSERR)
1927 broadcast = GNUNET_NO;
1929 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-udp",
1930 "BROADCAST_INTERVAL", &interval))
1932 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
1935 /* Maximum datarate */
1936 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1937 "MAX_BPS", &udp_max_bps))
1939 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
1942 plugin = GNUNET_malloc (sizeof (struct Plugin));
1943 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1945 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1946 GNUNET_BANDWIDTH_value_init ((uint32_t)udp_max_bps), 30);
1949 plugin->sessions = GNUNET_CONTAINER_multihashmap_create (10);
1950 plugin->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1951 plugin->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
1952 plugin->port = port;
1953 plugin->aport = aport;
1954 plugin->broadcast_interval = interval;
1955 plugin->enable_ipv6 = enable_v6;
1960 api->disconnect = &udp_disconnect;
1961 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1962 api->address_to_string = &udp_address_to_string;
1963 api->check_address = &udp_plugin_check_address;
1964 api->get_session = &udp_plugin_get_session;
1965 api->send = &udp_plugin_send;
1967 LOG (GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
1968 res = setup_sockets (plugin, &serverAddrv6, &serverAddrv4);
1969 if ((res == 0) || ((plugin->sockv4 == NULL) && (plugin->sockv6 == NULL)))
1971 LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to create network sockets, plugin failed\n");
1972 GNUNET_free (plugin);
1977 LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting broadcasting\n");
1978 if (broadcast == GNUNET_YES)
1979 setup_broadcast (plugin, &serverAddrv6, &serverAddrv4);
1982 GNUNET_free_non_null (bind4_address);
1983 GNUNET_free_non_null (bind6_address);
1987 int heap_cleanup_iterator (void *cls,
1988 struct GNUNET_CONTAINER_HeapNode *
1989 node, void *element,
1990 GNUNET_CONTAINER_HeapCostType
1993 struct DefragContext * d_ctx = element;
1995 GNUNET_CONTAINER_heap_remove_node (node);
1996 GNUNET_DEFRAGMENT_context_destroy(d_ctx->defrag);
1997 GNUNET_free (d_ctx);
2004 * The exported method. Makes the core api available via a global and
2005 * returns the udp transport API.
2007 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2008 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
2011 libgnunet_plugin_transport_udp_done (void *cls)
2013 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2014 struct Plugin *plugin = api->cls;
2015 stop_broadcast (plugin);
2017 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
2019 GNUNET_SCHEDULER_cancel (plugin->select_task);
2020 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
2023 /* Closing sockets */
2024 if (plugin->sockv4 != NULL)
2026 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
2027 plugin->sockv4 = NULL;
2029 if (plugin->sockv6 != NULL)
2031 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
2032 plugin->sockv6 = NULL;
2034 GNUNET_NETWORK_fdset_destroy (plugin->rs);
2035 GNUNET_NETWORK_fdset_destroy (plugin->ws);
2036 GNUNET_NAT_unregister (plugin->nat);
2038 if (plugin->defrag_ctxs != NULL)
2040 GNUNET_CONTAINER_heap_iterate(plugin->defrag_ctxs,
2041 heap_cleanup_iterator, NULL);
2042 GNUNET_CONTAINER_heap_destroy(plugin->defrag_ctxs);
2043 plugin->defrag_ctxs = NULL;
2045 if (plugin->mst != NULL)
2047 GNUNET_SERVER_mst_destroy(plugin->mst);
2051 /* Clean up leftover messages */
2052 struct UDPMessageWrapper * udpw;
2053 udpw = plugin->ipv4_queue_head;
2054 while (udpw != NULL)
2056 struct UDPMessageWrapper *tmp = udpw->next;
2057 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
2058 if (udpw->cont != NULL)
2059 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2063 udpw = plugin->ipv6_queue_head;
2064 while (udpw != NULL)
2066 struct UDPMessageWrapper *tmp = udpw->next;
2067 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
2068 if (udpw->cont != NULL)
2069 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2074 /* Clean up sessions */
2076 LOG (GNUNET_ERROR_TYPE_DEBUG,
2077 "Cleaning up sessions\n");
2079 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &disconnect_and_free_it, plugin);
2080 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
2083 GNUNET_free (plugin);
2089 /* end of plugin_transport_udp.c */