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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;
537 LOG (GNUNET_ERROR_TYPE_DEBUG,
538 "Session %p to peer `%s' address ended \n",
540 GNUNET_i2s (&s->target),
541 GNUNET_a2s (s->sock_addr, s->addrlen));
543 plugin->env->session_end (plugin->env->cls, &s->target, s);
545 if (s->frag_ctx != NULL)
547 GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag);
548 GNUNET_free (s->frag_ctx);
552 udpw = plugin->msg_head;
555 if (udpw->session == s)
557 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
559 if (udpw->cont != NULL)
560 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
563 udpw = plugin->msg_head;
566 GNUNET_assert (GNUNET_YES ==
567 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
568 &s->target.hashPubKey,
578 * Disconnect from a remote node. Clean up session if we have one for this peer
580 * @param cls closure for this call (should be handle to Plugin)
581 * @param target the peeridentity of the peer to disconnect
582 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
585 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
587 struct Plugin *plugin = cls;
588 GNUNET_assert (plugin != NULL);
590 GNUNET_assert (target != NULL);
592 LOG (GNUNET_ERROR_TYPE_DEBUG,
593 "Disconnecting from peer `%s'\n", GNUNET_i2s (target));
595 /* Clean up sessions */
596 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin);
599 static struct Session *
600 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
601 const void *addr, size_t addrlen,
602 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
605 const struct IPv4UdpAddress *t4;
606 const struct IPv6UdpAddress *t6;
607 struct sockaddr_in *v4;
608 struct sockaddr_in6 *v6;
613 case sizeof (struct IPv4UdpAddress):
614 if (NULL == plugin->sockv4)
619 s = GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in));
620 len = sizeof (struct sockaddr_in);
621 v4 = (struct sockaddr_in *) &s[1];
622 v4->sin_family = AF_INET;
623 #if HAVE_SOCKADDR_IN_SIN_LEN
624 v4->sin_len = sizeof (struct sockaddr_in);
626 v4->sin_port = t4->u4_port;
627 v4->sin_addr.s_addr = t4->ipv4_addr;
628 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v4, sizeof (struct sockaddr_in));
630 case sizeof (struct IPv6UdpAddress):
631 if (NULL == plugin->sockv6)
637 GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6));
638 len = sizeof (struct sockaddr_in6);
639 v6 = (struct sockaddr_in6 *) &s[1];
640 v6->sin6_family = AF_INET6;
641 #if HAVE_SOCKADDR_IN_SIN_LEN
642 v6->sin6_len = sizeof (struct sockaddr_in6);
644 v6->sin6_port = t6->u6_port;
645 v6->sin6_addr = t6->ipv6_addr;
646 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v6, sizeof (struct sockaddr_in6));
649 /* Must have a valid address to send to */
656 s->sock_addr = (const struct sockaddr *) &s[1];
657 s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero();
658 s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero();
659 s->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
664 static int session_cmp_it (void *cls,
665 const GNUNET_HashCode * key,
668 struct SessionCompareContext * cctx = cls;
669 const struct GNUNET_HELLO_Address *address = cctx->addr;
670 struct Session *s = value;
672 socklen_t s_addrlen = s->addrlen;
675 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing address %s <-> %s\n",
676 udp_address_to_string (NULL, (void *) address->address, address->address_length),
677 GNUNET_a2s (s->sock_addr, s->addrlen));
680 if ((address->address_length == sizeof (struct IPv4UdpAddress)) &&
681 (s_addrlen == sizeof (struct sockaddr_in)))
683 struct IPv4UdpAddress * u4 = NULL;
684 u4 = (struct IPv4UdpAddress *) address->address;
685 const struct sockaddr_in *s4 = (const struct sockaddr_in *) s->sock_addr;
686 if ((0 == memcmp ((const void *) &u4->ipv4_addr,(const void *) &s4->sin_addr, sizeof (struct in_addr))) &&
687 (u4->u4_port == s4->sin_port))
694 if ((address->address_length == sizeof (struct IPv6UdpAddress)) &&
695 (s_addrlen == sizeof (struct sockaddr_in6)))
697 struct IPv6UdpAddress * u6 = NULL;
698 u6 = (struct IPv6UdpAddress *) address->address;
699 const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) s->sock_addr;
700 if ((0 == memcmp (&u6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr))) &&
701 (u6->u6_port == s6->sin6_port))
714 * Creates a new outbound session the transport service will use to send data to the
717 * @param cls the plugin
718 * @param address the address
719 * @return the session or NULL of max connections exceeded
721 static struct Session *
722 udp_plugin_get_session (void *cls,
723 const struct GNUNET_HELLO_Address *address)
725 struct Session * s = NULL;
726 struct Plugin * plugin = cls;
728 GNUNET_assert (plugin != NULL);
729 GNUNET_assert (address != NULL);
731 if ((address->address == NULL) ||
732 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
733 (address->address_length != sizeof (struct IPv6UdpAddress))))
739 /* check if session already exists */
740 struct SessionCompareContext cctx;
744 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));
746 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx);
747 if (cctx.res != NULL)
750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res);
755 /* otherwise create new */
756 s = create_session (plugin,
759 address->address_length,
762 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
763 "Creating new session %p for peer `%s' address `%s'\n",
765 GNUNET_i2s(&address->peer),
766 udp_address_to_string(NULL,address->address,address->address_length));
768 GNUNET_assert (GNUNET_OK ==
769 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
770 &s->target.hashPubKey,
772 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
778 * Function that is called with messages created by the fragmentation
779 * module. In the case of the 'proc' callback of the
780 * GNUNET_FRAGMENT_context_create function, this function must
781 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
783 * @param cls closure, the 'struct FragmentationContext'
784 * @param msg the message that was created
787 enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
789 struct FragmentationContext *frag_ctx = cls;
790 struct Plugin *plugin = frag_ctx->plugin;
791 struct UDPMessageWrapper * udpw;
793 size_t msg_len = ntohs (msg->size);
796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper));
799 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msg_len);
800 udpw->session = frag_ctx->session;
801 udpw->udp = (char *) &udpw[1];
803 udpw->msg_size = msg_len;
804 udpw->cont = frag_ctx->cont;
805 udpw->cont_cls = frag_ctx->cont_cls;
806 udpw->timeout = frag_ctx->timeout;
807 udpw->frag_ctx = frag_ctx;
808 memcpy (udpw->udp, msg, msg_len);
810 GNUNET_CONTAINER_DLL_insert(plugin->msg_head, plugin->msg_tail, udpw);
815 * Function that can be used by the transport service to transmit
816 * a message using the plugin. Note that in the case of a
817 * peer disconnecting, the continuation MUST be called
818 * prior to the disconnect notification itself. This function
819 * will be called with this peer's HELLO message to initiate
820 * a fresh connection to another peer.
823 * @param s which session must be used
824 * @param msgbuf the message to transmit
825 * @param msgbuf_size number of bytes in 'msgbuf'
826 * @param priority how important is the message (most plugins will
827 * ignore message priority and just FIFO)
828 * @param to how long to wait at most for the transmission (does not
829 * require plugins to discard the message after the timeout,
830 * just advisory for the desired delay; most plugins will ignore
832 * @param cont continuation to call once the message has
833 * been transmitted (or if the transport is ready
834 * for the next transmission call; or if the
835 * peer disconnected...); can be NULL
836 * @param cont_cls closure for cont
837 * @return number of bytes used (on the physical network, with overheads);
838 * -1 on hard errors (i.e. address invalid); 0 is a legal value
839 * and does NOT mean that the message was not transmitted (DV)
842 udp_plugin_send (void *cls,
844 const char *msgbuf, size_t msgbuf_size,
845 unsigned int priority,
846 struct GNUNET_TIME_Relative to,
847 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
849 struct Plugin *plugin = cls;
850 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
852 struct UDPMessageWrapper * udpw;
853 struct UDPMessage *udp;
855 GNUNET_assert (plugin != NULL);
856 GNUNET_assert (s != NULL);
858 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
861 return GNUNET_SYSERR;
864 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessions, &s->target.hashPubKey, s))
867 return GNUNET_SYSERR;
870 LOG (GNUNET_ERROR_TYPE_DEBUG,
871 "UDP transmits %u-byte message to `%s' using address `%s'\n",
873 GNUNET_i2s (&s->target),
874 GNUNET_a2s(s->sock_addr, s->addrlen));
877 udp = (struct UDPMessage *) mbuf;
878 udp->header.size = htons (mlen);
879 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
880 udp->reserved = htonl (0);
881 udp->sender = *plugin->env->my_identity;
885 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + mlen);
887 udpw->udp = (char *) &udpw[1];
888 udpw->msg_size = mlen;
889 udpw->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
891 udpw->cont_cls = cont_cls;
892 udpw->frag_ctx = NULL;
894 memcpy (udpw->udp, udp, sizeof (struct UDPMessage));
895 memcpy (&udpw->udp[sizeof (struct UDPMessage)], msgbuf, msgbuf_size);
897 GNUNET_CONTAINER_DLL_insert(plugin->msg_head, plugin->msg_tail, udpw);
901 LOG (GNUNET_ERROR_TYPE_DEBUG,
902 "UDP has to fragment message \n");
903 if (s->frag_ctx != NULL)
904 return GNUNET_SYSERR;
905 memcpy (&udp[1], msgbuf, msgbuf_size);
906 struct FragmentationContext * frag_ctx = GNUNET_malloc(sizeof (struct FragmentationContext));
908 frag_ctx->plugin = plugin;
909 frag_ctx->session = s;
910 frag_ctx->cont = cont;
911 frag_ctx->cont_cls = cont_cls;
912 frag_ctx->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
913 frag_ctx->bytes_to_send = mlen;
914 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
917 s->last_expected_delay,
922 s->frag_ctx = frag_ctx;
930 * Our external IP address/port mapping has changed.
932 * @param cls closure, the 'struct LocalAddrList'
933 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
934 * the previous (now invalid) one
935 * @param addr either the previous or the new public IP address
936 * @param addrlen actual lenght of the address
939 udp_nat_port_map_callback (void *cls, int add_remove,
940 const struct sockaddr *addr, socklen_t addrlen)
942 struct Plugin *plugin = cls;
943 struct IPv4UdpAddress u4;
944 struct IPv6UdpAddress u6;
948 /* convert 'addr' to our internal format */
949 switch (addr->sa_family)
952 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
953 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
954 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
959 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
960 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
961 sizeof (struct in6_addr));
962 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
970 /* modify our published address list */
971 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
977 * Message tokenizer has broken up an incomming message. Pass it on
980 * @param cls the 'struct Plugin'
981 * @param client the 'struct SourceInformation'
982 * @param hdr the actual message
985 process_inbound_tokenized_messages (void *cls, void *client,
986 const struct GNUNET_MessageHeader *hdr)
988 struct Plugin *plugin = cls;
989 struct SourceInformation *si = client;
990 struct GNUNET_ATS_Information ats[2];
991 struct GNUNET_TIME_Relative delay;
993 GNUNET_assert (si->session != NULL);
995 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
996 ats[0].value = htonl (1);
997 ats[1] = si->session->ats;
998 GNUNET_break (ntohl(ats[1].value) != GNUNET_ATS_NET_UNSPECIFIED);
1000 delay = plugin->env->receive (plugin->env->cls,
1003 (const struct GNUNET_ATS_Information *) &ats, 2,
1007 si->session->flow_delay_for_other_peer = delay;
1012 * We've received a UDP Message. Process it (pass contents to main service).
1014 * @param plugin plugin context
1015 * @param msg the message
1016 * @param sender_addr sender address
1017 * @param sender_addr_len number of bytes in sender_addr
1020 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
1021 const struct sockaddr *sender_addr,
1022 socklen_t sender_addr_len)
1024 struct SourceInformation si;
1025 struct Session * s = NULL;
1026 struct IPv4UdpAddress u4;
1027 struct IPv6UdpAddress u6;
1028 struct GNUNET_ATS_Information ats;
1032 if (0 != ntohl (msg->reserved))
1034 GNUNET_break_op (0);
1037 if (ntohs (msg->header.size) <
1038 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
1040 GNUNET_break_op (0);
1044 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
1045 ats.value = htonl (GNUNET_ATS_NET_UNSPECIFIED);
1046 /* convert address */
1047 switch (sender_addr->sa_family)
1050 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
1051 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
1052 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1057 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
1058 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
1059 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
1068 LOG (GNUNET_ERROR_TYPE_DEBUG,
1069 "Received message with %u bytes from peer `%s' at `%s'\n",
1070 (unsigned int) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1071 GNUNET_a2s (sender_addr, sender_addr_len));
1074 struct GNUNET_HELLO_Address * address = GNUNET_HELLO_address_allocate(&msg->sender, "udp", arg, args);
1075 s = udp_plugin_get_session(plugin, address);
1076 GNUNET_free (address);
1078 /* iterate over all embedded messages */
1080 si.sender = msg->sender;
1084 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1085 ntohs (msg->header.size) -
1086 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1091 * Scan the heap for a receive context with the given address.
1093 * @param cls the 'struct FindReceiveContext'
1094 * @param node internal node of the heap
1095 * @param element value stored at the node (a 'struct ReceiveContext')
1096 * @param cost cost associated with the node
1097 * @return GNUNET_YES if we should continue to iterate,
1101 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1102 void *element, GNUNET_CONTAINER_HeapCostType cost)
1104 struct FindReceiveContext *frc = cls;
1105 struct DefragContext *e = element;
1107 if ((frc->addr_len == e->addr_len) &&
1108 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1118 * Process a defragmented message.
1120 * @param cls the 'struct ReceiveContext'
1121 * @param msg the message
1124 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1126 struct DefragContext *rc = cls;
1128 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1133 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1138 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1139 rc->src_addr, rc->addr_len);
1142 struct LookupContext
1144 const struct sockaddr * addr;
1147 struct Session *res;
1151 lookup_session_by_addr_it (void *cls, const GNUNET_HashCode * key, void *value)
1153 struct LookupContext *l_ctx = cls;
1154 struct Session * s = value;
1156 if ((s->addrlen == l_ctx->addrlen) &&
1157 (0 == memcmp (s->sock_addr, l_ctx->addr, s->addrlen)))
1166 * Transmit an acknowledgement.
1168 * @param cls the 'struct ReceiveContext'
1169 * @param id message ID (unused)
1170 * @param msg ack to transmit
1173 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1175 struct DefragContext *rc = cls;
1177 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1178 struct UDP_ACK_Message *udp_ack;
1180 struct UDPMessageWrapper *udpw;
1183 struct LookupContext l_ctx;
1184 l_ctx.addr = rc->src_addr;
1185 l_ctx.addrlen = rc->addr_len;
1187 GNUNET_CONTAINER_multihashmap_iterate (rc->plugin->sessions,
1188 &lookup_session_by_addr_it,
1192 GNUNET_assert (s != NULL);
1194 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1195 delay = s->flow_delay_for_other_peer.rel_value;
1198 LOG (GNUNET_ERROR_TYPE_DEBUG,
1199 "Sending ACK to `%s' including delay of %u ms\n",
1200 GNUNET_a2s (rc->src_addr,
1201 (rc->src_addr->sa_family ==
1202 AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct
1206 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msize);
1208 udpw->cont_cls = NULL;
1209 udpw->frag_ctx = NULL;
1210 udpw->msg_size = msize;
1212 udpw->timeout = GNUNET_TIME_absolute_get_forever();
1213 udpw->udp = (char *)&udpw[1];
1215 udp_ack = (struct UDP_ACK_Message *) udpw->udp;
1216 udp_ack->header.size = htons ((uint16_t) msize);
1217 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1218 udp_ack->delay = htonl (delay);
1219 udp_ack->sender = *rc->plugin->env->my_identity;
1220 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1222 GNUNET_CONTAINER_DLL_insert(rc->plugin->msg_head, rc->plugin->msg_tail, udpw);
1226 static void read_process_msg (struct Plugin *plugin,
1227 const struct GNUNET_MessageHeader *msg,
1231 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1233 GNUNET_break_op (0);
1236 process_udp_message (plugin, (const struct UDPMessage *) msg,
1237 (const struct sockaddr *) addr, fromlen);
1241 static void read_process_ack (struct Plugin *plugin,
1242 const struct GNUNET_MessageHeader *msg,
1246 const struct GNUNET_MessageHeader *ack;
1247 const struct UDP_ACK_Message *udp_ack;
1248 struct LookupContext l_ctx;
1249 struct Session *s = NULL;
1250 struct GNUNET_TIME_Relative flow_delay;
1252 if (ntohs (msg->size) <
1253 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1255 GNUNET_break_op (0);
1259 udp_ack = (const struct UDP_ACK_Message *) msg;
1261 l_ctx.addr = (const struct sockaddr *) addr;
1262 l_ctx.addrlen = fromlen;
1264 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions,
1265 &lookup_session_by_addr_it,
1269 if ((s == NULL) || (s->frag_ctx == NULL))
1272 flow_delay.rel_value = (uint64_t) ntohl (udp_ack->delay);
1273 LOG (GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %llu\n",
1274 flow_delay.rel_value);
1275 s->flow_delay_from_other_peer =
1276 GNUNET_TIME_relative_to_absolute (flow_delay);
1278 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1279 if (ntohs (ack->size) !=
1280 ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1282 GNUNET_break_op (0);
1286 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack))
1289 LOG (GNUNET_ERROR_TYPE_DEBUG,
1290 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1291 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1292 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1298 LOG (GNUNET_ERROR_TYPE_DEBUG,
1299 "FULL MESSAGE ACKed\n",
1300 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1301 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1303 s->last_expected_delay = GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag);
1305 struct UDPMessageWrapper * udpw = plugin->msg_head;
1308 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1310 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
1316 if (s->frag_ctx->cont != NULL)
1318 (s->frag_ctx->cont_cls, &udp_ack->sender, GNUNET_OK);
1319 GNUNET_free (s->frag_ctx);
1324 static void read_process_fragment (struct Plugin *plugin,
1325 const struct GNUNET_MessageHeader *msg,
1329 struct DefragContext *d_ctx;
1330 struct GNUNET_TIME_Absolute now;
1331 struct FindReceiveContext frc;
1335 frc.addr = (const struct sockaddr *) addr;
1336 frc.addr_len = fromlen;
1339 LOG (GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
1340 (unsigned int) ntohs (msg->size),
1341 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1344 /* Lookup existing receive context for this address */
1345 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1346 &find_receive_context,
1348 now = GNUNET_TIME_absolute_get ();
1353 /* Create a new defragmentation context */
1354 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + fromlen);
1355 memcpy (&d_ctx[1], addr, fromlen);
1356 d_ctx->src_addr = (const struct sockaddr *) &d_ctx[1];
1357 d_ctx->addr_len = fromlen;
1358 d_ctx->plugin = plugin;
1360 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1361 UDP_MAX_MESSAGES_IN_DEFRAG, d_ctx,
1362 &fragment_msg_proc, &ack_proc);
1364 GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, d_ctx,
1365 (GNUNET_CONTAINER_HeapCostType)
1368 LOG (GNUNET_ERROR_TYPE_DEBUG, "Created new defragmentation context for %u-byte fragment from `%s'\n",
1369 (unsigned int) ntohs (msg->size),
1370 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1376 LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing defragmentation context for %u-byte fragment from `%s'\n",
1377 (unsigned int) ntohs (msg->size),
1378 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1382 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
1384 /* keep this 'rc' from expiring */
1385 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs, d_ctx->hnode,
1386 (GNUNET_CONTAINER_HeapCostType)
1389 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
1390 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1392 /* remove 'rc' that was inactive the longest */
1393 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
1394 GNUNET_assert (NULL != d_ctx);
1395 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1396 GNUNET_free (d_ctx);
1401 * Read and process a message from the given socket.
1403 * @param plugin the overall plugin
1404 * @param rsock socket to read from
1407 udp_select_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1413 const struct GNUNET_MessageHeader *msg;
1415 fromlen = sizeof (addr);
1416 memset (&addr, 0, sizeof (addr));
1417 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1418 (struct sockaddr *) &addr, &fromlen);
1420 if (size < sizeof (struct GNUNET_MessageHeader))
1422 GNUNET_break_op (0);
1425 msg = (const struct GNUNET_MessageHeader *) buf;
1427 LOG (GNUNET_ERROR_TYPE_DEBUG,
1428 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) size,
1429 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs (msg->type));
1431 if (size != ntohs (msg->size))
1433 GNUNET_break_op (0);
1437 switch (ntohs (msg->type))
1439 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
1440 udp_broadcast_receive (plugin, &buf, size, addr, fromlen);
1443 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1444 read_process_msg (plugin, msg, addr, fromlen);
1447 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1448 read_process_ack (plugin, msg, addr, fromlen);;
1451 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1452 read_process_fragment (plugin, msg, addr, fromlen);
1456 GNUNET_break_op (0);
1462 udp_select_send (struct Plugin *plugin)
1466 struct GNUNET_TIME_Absolute max;
1467 struct GNUNET_TIME_Absolute ;
1469 struct UDPMessageWrapper *udpw = plugin->msg_head;
1470 const struct sockaddr * sa = udpw->session->sock_addr;
1472 max = GNUNET_TIME_absolute_max(udpw->timeout, GNUNET_TIME_absolute_get());
1474 while (udpw != NULL)
1476 if (max.abs_value != udpw->timeout.abs_value)
1478 /* Message timed out */
1480 if (udpw->cont != NULL)
1481 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1482 if (udpw->frag_ctx != NULL)
1485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Fragmented message for peer `%s' with size %u timed out\n",
1486 GNUNET_i2s(&udpw->session->target), udpw->frag_ctx->bytes_to_send);
1488 udpw->session->last_expected_delay = GNUNET_FRAGMENT_context_destroy(udpw->frag_ctx->frag);
1489 GNUNET_free (udpw->frag_ctx);
1490 udpw->session->frag_ctx = NULL;
1495 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' with size %u timed out\n",
1496 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1500 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
1502 udpw = plugin->msg_head;
1506 struct GNUNET_TIME_Relative delta = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
1507 if (delta.rel_value == 0)
1509 /* this message is not delayed */
1510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is not delayed \n",
1511 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1516 /* this message is delayed, try next */
1517 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is delayed for %llu \n",
1518 GNUNET_i2s(&udpw->session->target), udpw->msg_size,
1528 /* No message left */
1532 switch (sa->sa_family)
1535 if (NULL == plugin->sockv4)
1538 GNUNET_NETWORK_socket_sendto (plugin->sockv4, udpw->udp, udpw->msg_size,
1539 sa, slen = sizeof (struct sockaddr_in));
1542 if (NULL == plugin->sockv6)
1545 GNUNET_NETWORK_socket_sendto (plugin->sockv6, udpw->udp, udpw->msg_size,
1546 sa, slen = sizeof (struct sockaddr_in6));
1552 if (GNUNET_SYSERR == sent)
1554 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
1555 LOG (GNUNET_ERROR_TYPE_DEBUG,
1556 "UDP transmitted %u-byte message to %s (%d: %s)\n",
1557 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1558 (sent < 0) ? STRERROR (errno) : "ok");
1559 if (udpw->cont != NULL)
1560 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1562 LOG (GNUNET_ERROR_TYPE_DEBUG,
1563 "UDP transmitted %u-byte message to %s (%d: %s)\n",
1564 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1565 (sent < 0) ? STRERROR (errno) : "ok");
1567 /* This was just a message fragment */
1568 if (udpw->frag_ctx != NULL)
1570 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1572 /* This was a complete message*/
1575 if (udpw->cont != NULL)
1576 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_OK);
1579 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
1586 * We have been notified that our readset has something to read. We don't
1587 * know which socket needs to be read, so we have to check each one
1588 * Then reschedule this function to be called again once more is available.
1590 * @param cls the plugin handle
1591 * @param tc the scheduling context (for rescheduling this function again)
1594 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1596 struct Plugin *plugin = cls;
1598 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1599 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1602 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1604 if ((NULL != plugin->sockv4) &&
1605 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1606 udp_select_read (plugin, plugin->sockv4);
1607 if ((NULL != plugin->sockv6) &&
1608 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1609 udp_select_read (plugin, plugin->sockv6);
1612 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1614 if (plugin->msg_head != NULL)
1615 udp_select_send (plugin);
1618 plugin->select_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1619 GNUNET_SCHEDULER_NO_TASK,
1620 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1621 plugin->ws, &udp_plugin_select, plugin);
1627 setup_sockets (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
1630 int sockets_created = 0;
1631 struct sockaddr *serverAddr;
1632 struct sockaddr *addrs[2];
1633 socklen_t addrlens[2];
1636 /* Create IPv6 socket */
1637 if (plugin->enable_ipv6 == GNUNET_YES)
1639 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1640 if (NULL == plugin->sockv6)
1642 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Disabling IPv6 since it is not supported on this system!");
1643 plugin->enable_ipv6 = GNUNET_NO;
1647 #if HAVE_SOCKADDR_IN_SIN_LEN
1648 serverAddrv6->sin6_len = sizeof (serverAddrv6);
1650 serverAddrv6->sin6_family = AF_INET6;
1651 serverAddrv6->sin6_addr = in6addr_any;
1652 serverAddrv6->sin6_port = htons (plugin->port);
1653 addrlen = sizeof (struct sockaddr_in6);
1654 serverAddr = (struct sockaddr *) serverAddrv6;
1656 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1657 ntohs (serverAddrv6->sin6_port));
1660 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1663 serverAddrv6->sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1665 LOG (GNUNET_ERROR_TYPE_DEBUG,
1666 "IPv6 Binding failed, trying new port %d\n",
1667 ntohs (serverAddrv6->sin6_port));
1672 GNUNET_NETWORK_socket_close (plugin->sockv6);
1673 plugin->sockv6 = NULL;
1677 if (plugin->sockv6 != NULL)
1680 LOG (GNUNET_ERROR_TYPE_DEBUG,
1681 "IPv6 socket created on port %d\n",
1682 ntohs (serverAddrv6->sin6_port));
1684 addrs[sockets_created] = (struct sockaddr *) serverAddrv6;
1685 addrlens[sockets_created] = sizeof (struct sockaddr_in6);
1691 /* Create IPv4 socket */
1692 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1693 if (NULL == plugin->sockv4)
1695 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1699 #if HAVE_SOCKADDR_IN_SIN_LEN
1700 serverAddrv4->sin_len = sizeof (serverAddrv4);
1702 serverAddrv4->sin_family = AF_INET;
1703 serverAddrv4->sin_addr.s_addr = INADDR_ANY;
1704 serverAddrv4->sin_port = htons (plugin->port);
1705 addrlen = sizeof (struct sockaddr_in);
1706 serverAddr = (struct sockaddr *) serverAddrv4;
1709 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1710 ntohs (serverAddrv4->sin_port));
1713 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1716 serverAddrv4->sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1718 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
1719 ntohs (serverAddrv4->sin_port));
1724 GNUNET_NETWORK_socket_close (plugin->sockv4);
1725 plugin->sockv4 = NULL;
1729 if (plugin->sockv4 != NULL)
1731 addrs[sockets_created] = (struct sockaddr *) serverAddrv4;
1732 addrlens[sockets_created] = sizeof (struct sockaddr_in);
1737 /* Create file descriptors */
1738 plugin->rs = GNUNET_NETWORK_fdset_create ();
1739 plugin->ws = GNUNET_NETWORK_fdset_create ();
1740 GNUNET_NETWORK_fdset_zero (plugin->rs);
1741 GNUNET_NETWORK_fdset_zero (plugin->ws);
1742 if (NULL != plugin->sockv4)
1744 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv4);
1745 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->sockv4);
1747 if (NULL != plugin->sockv6)
1749 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv6);
1750 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->sockv6);
1753 if (sockets_created == 0)
1754 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
1756 plugin->select_task =
1757 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1758 GNUNET_SCHEDULER_NO_TASK,
1759 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1760 plugin->ws, &udp_plugin_select, plugin);
1762 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
1763 GNUNET_NO, plugin->port,
1765 (const struct sockaddr **) addrs, addrlens,
1766 &udp_nat_port_map_callback, NULL, plugin);
1768 return sockets_created;
1773 * The exported method. Makes the core api available via a global and
1774 * returns the udp transport API.
1776 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
1777 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
1780 libgnunet_plugin_transport_udp_init (void *cls)
1782 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1783 struct GNUNET_TRANSPORT_PluginFunctions *api;
1784 struct Plugin *plugin;
1786 unsigned long long port;
1787 unsigned long long aport;
1788 unsigned long long broadcast;
1789 unsigned long long udp_max_bps;
1790 unsigned long long enable_v6;
1791 char * bind4_address;
1792 char * bind6_address;
1793 struct GNUNET_TIME_Relative interval;
1795 struct sockaddr_in serverAddrv4;
1796 struct sockaddr_in6 serverAddrv6;
1800 /* Get port number */
1802 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
1806 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1807 "ADVERTISED_PORT", &aport))
1811 LOG (GNUNET_ERROR_TYPE_WARNING,
1812 _("Given `%s' option is out of range: %llu > %u\n"), "PORT", port,
1819 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat",
1822 enable_v6 = GNUNET_NO;
1825 enable_v6 = GNUNET_YES;
1829 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1830 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1833 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1834 "BINDTO", &bind4_address))
1836 LOG (GNUNET_ERROR_TYPE_DEBUG,
1837 "Binding udp plugin to specific address: `%s'\n",
1839 if (1 != inet_pton (AF_INET, bind4_address, &serverAddrv4.sin_addr))
1841 GNUNET_free (bind4_address);
1847 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1848 "BINDTO6", &bind6_address))
1850 LOG (GNUNET_ERROR_TYPE_DEBUG,
1851 "Binding udp plugin to specific address: `%s'\n",
1854 inet_pton (AF_INET6, bind6_address, &serverAddrv6.sin6_addr))
1856 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
1858 GNUNET_free_non_null (bind4_address);
1859 GNUNET_free (bind6_address);
1865 /* Enable neighbour discovery */
1866 broadcast = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp",
1868 if (broadcast == GNUNET_SYSERR)
1869 broadcast = GNUNET_NO;
1871 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-udp",
1872 "BROADCAST_INTERVAL", &interval))
1874 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
1877 /* Maximum datarate */
1878 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1879 "MAX_BPS", &udp_max_bps))
1881 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
1884 plugin = GNUNET_malloc (sizeof (struct Plugin));
1885 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1887 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1888 GNUNET_BANDWIDTH_value_init ((uint32_t)udp_max_bps), 30);
1891 plugin->sessions = GNUNET_CONTAINER_multihashmap_create (10);
1892 plugin->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1893 plugin->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
1894 plugin->port = port;
1895 plugin->aport = aport;
1896 plugin->broadcast_interval = interval;
1897 plugin->enable_ipv6 = enable_v6;
1902 api->disconnect = &udp_disconnect;
1903 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1904 api->address_to_string = &udp_address_to_string;
1905 api->check_address = &udp_plugin_check_address;
1906 api->get_session = &udp_plugin_get_session;
1907 api->send = &udp_plugin_send;
1909 LOG (GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
1910 res = setup_sockets (plugin, &serverAddrv6, &serverAddrv4);
1911 if ((res == 0) || ((plugin->sockv4 == NULL) && (plugin->sockv6 == NULL)))
1913 LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to create network sockets, plugin failed\n");
1914 GNUNET_free (plugin);
1919 LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting broadcasting\n");
1920 if (broadcast == GNUNET_YES)
1921 setup_broadcast (plugin, &serverAddrv6, &serverAddrv4);
1924 GNUNET_free_non_null (bind4_address);
1925 GNUNET_free_non_null (bind6_address);
1929 int heap_cleanup_iterator (void *cls,
1930 struct GNUNET_CONTAINER_HeapNode *
1931 node, void *element,
1932 GNUNET_CONTAINER_HeapCostType
1935 struct DefragContext * d_ctx = element;
1937 GNUNET_CONTAINER_heap_remove_node (node);
1938 GNUNET_DEFRAGMENT_context_destroy(d_ctx->defrag);
1939 GNUNET_free (d_ctx);
1946 * The exported method. Makes the core api available via a global and
1947 * returns the udp transport API.
1949 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
1950 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
1953 libgnunet_plugin_transport_udp_done (void *cls)
1955 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1956 struct Plugin *plugin = api->cls;
1957 stop_broadcast (plugin);
1959 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1961 GNUNET_SCHEDULER_cancel (plugin->select_task);
1962 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1965 /* Closing sockets */
1966 if (plugin->sockv4 != NULL)
1968 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
1969 plugin->sockv4 = NULL;
1971 if (plugin->sockv6 != NULL)
1973 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
1974 plugin->sockv6 = NULL;
1976 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1977 GNUNET_NETWORK_fdset_destroy (plugin->ws);
1978 GNUNET_NAT_unregister (plugin->nat);
1980 if (plugin->defrag_ctxs != NULL)
1982 GNUNET_CONTAINER_heap_iterate(plugin->defrag_ctxs,
1983 heap_cleanup_iterator, NULL);
1984 GNUNET_CONTAINER_heap_destroy(plugin->defrag_ctxs);
1985 plugin->defrag_ctxs = NULL;
1987 if (plugin->mst != NULL)
1989 GNUNET_SERVER_mst_destroy(plugin->mst);
1993 /* Clean up leftover messages */
1994 struct UDPMessageWrapper *udpw = plugin->msg_head;
1995 while (udpw != NULL)
1997 struct UDPMessageWrapper *tmp = udpw->next;
1998 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
1999 if (udpw->cont != NULL)
2000 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2005 /* Clean up sessions */
2007 LOG (GNUNET_ERROR_TYPE_DEBUG,
2008 "Cleaning up sessions\n");
2010 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &disconnect_and_free_it, plugin);
2011 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
2014 GNUNET_free (plugin);
2020 /* end of plugin_transport_udp.c */