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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;
293 * We have been notified that our readset has something to read. We don't
294 * know which socket needs to be read, so we have to check each one
295 * Then reschedule this function to be called again once more is available.
297 * @param cls the plugin handle
298 * @param tc the scheduling context (for rescheduling this function again)
301 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
304 * We have been notified that our readset has something to read. We don't
305 * know which socket needs to be read, so we have to check each one
306 * Then reschedule this function to be called again once more is available.
308 * @param cls the plugin handle
309 * @param tc the scheduling context (for rescheduling this function again)
312 udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
315 * Function called for a quick conversion of the binary address to
316 * a numeric address. Note that the caller must not free the
317 * address and that the next call to this function is allowed
318 * to override the address again.
321 * @param addr binary address
322 * @param addrlen length of the address
323 * @return string representing the same address
326 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
328 static char rbuf[INET6_ADDRSTRLEN + 10];
329 char buf[INET6_ADDRSTRLEN];
333 const struct IPv4UdpAddress *t4;
334 const struct IPv6UdpAddress *t6;
338 if (addrlen == sizeof (struct IPv6UdpAddress))
342 port = ntohs (t6->u6_port);
343 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
346 else if (addrlen == sizeof (struct IPv4UdpAddress))
350 port = ntohs (t4->u4_port);
351 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
359 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
360 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
367 * Append our port and forward the result.
369 * @param cls a 'struct PrettyPrinterContext'
370 * @param hostname result from DNS resolver
373 append_port (void *cls, const char *hostname)
375 struct PrettyPrinterContext *ppc = cls;
378 if (hostname == NULL)
380 ppc->asc (ppc->asc_cls, NULL);
384 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
385 ppc->asc (ppc->asc_cls, ret);
391 * Convert the transports address to a nice, human-readable
395 * @param type name of the transport that generated the address
396 * @param addr one of the addresses of the host, NULL for the last address
397 * the specific address format depends on the transport
398 * @param addrlen length of the address
399 * @param numeric should (IP) addresses be displayed in numeric form?
400 * @param timeout after how long should we give up?
401 * @param asc function to call on each string
402 * @param asc_cls closure for asc
405 udp_plugin_address_pretty_printer (void *cls, const char *type,
406 const void *addr, size_t addrlen,
408 struct GNUNET_TIME_Relative timeout,
409 GNUNET_TRANSPORT_AddressStringCallback asc,
412 struct PrettyPrinterContext *ppc;
415 struct sockaddr_in a4;
416 struct sockaddr_in6 a6;
417 const struct IPv4UdpAddress *u4;
418 const struct IPv6UdpAddress *u6;
421 if (addrlen == sizeof (struct IPv6UdpAddress))
424 memset (&a6, 0, sizeof (a6));
425 a6.sin6_family = AF_INET6;
426 #if HAVE_SOCKADDR_IN_SIN_LEN
427 a6.sin6_len = sizeof (a6);
429 a6.sin6_port = u6->u6_port;
430 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
431 port = ntohs (u6->u6_port);
435 else if (addrlen == sizeof (struct IPv4UdpAddress))
438 memset (&a4, 0, sizeof (a4));
439 a4.sin_family = AF_INET;
440 #if HAVE_SOCKADDR_IN_SIN_LEN
441 a4.sin_len = sizeof (a4);
443 a4.sin_port = u4->u4_port;
444 a4.sin_addr.s_addr = u4->ipv4_addr;
445 port = ntohs (u4->u4_port);
451 /* invalid address */
456 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
458 ppc->asc_cls = asc_cls;
460 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
465 * Check if the given port is plausible (must be either our listen
466 * port or our advertised port). If it is neither, we return
469 * @param plugin global variables
470 * @param in_port port number to check
471 * @return GNUNET_OK if port is either open_port or adv_port
474 check_port (struct Plugin *plugin, uint16_t in_port)
476 if ((in_port == plugin->port) || (in_port == plugin->aport))
478 return GNUNET_SYSERR;
484 * Function that will be called to check if a binary address for this
485 * plugin is well-formed and corresponds to an address for THIS peer
486 * (as per our configuration). Naturally, if absolutely necessary,
487 * plugins can be a bit conservative in their answer, but in general
488 * plugins should make sure that the address does not redirect
489 * traffic to a 3rd party that might try to man-in-the-middle our
492 * @param cls closure, should be our handle to the Plugin
493 * @param addr pointer to the address
494 * @param addrlen length of addr
495 * @return GNUNET_OK if this is a plausible address for this peer
496 * and transport, GNUNET_SYSERR if not
500 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
502 struct Plugin *plugin = cls;
503 struct IPv4UdpAddress *v4;
504 struct IPv6UdpAddress *v6;
506 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
507 (addrlen != sizeof (struct IPv6UdpAddress)))
510 return GNUNET_SYSERR;
512 if (addrlen == sizeof (struct IPv4UdpAddress))
514 v4 = (struct IPv4UdpAddress *) addr;
515 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
516 return GNUNET_SYSERR;
518 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
519 sizeof (struct in_addr)))
520 return GNUNET_SYSERR;
524 v6 = (struct IPv6UdpAddress *) addr;
525 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
528 return GNUNET_SYSERR;
530 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
531 return GNUNET_SYSERR;
533 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
534 sizeof (struct in6_addr)))
535 return GNUNET_SYSERR;
542 * Destroy a session, plugin is being unloaded.
545 * @param key hash of public key of target peer
546 * @param value a 'struct PeerSession*' to clean up
547 * @return GNUNET_OK (continue to iterate)
550 disconnect_and_free_it (void *cls, const GNUNET_HashCode * key, void *value)
552 struct Plugin *plugin = cls;
553 struct Session *s = value;
554 struct UDPMessageWrapper *udpw;
555 struct UDPMessageWrapper *next;
558 LOG (GNUNET_ERROR_TYPE_DEBUG,
559 "Session %p to peer `%s' address ended \n",
561 GNUNET_i2s (&s->target),
562 GNUNET_a2s (s->sock_addr, s->addrlen));
565 if (s->frag_ctx != NULL)
567 GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag);
568 GNUNET_free (s->frag_ctx);
572 udpw = plugin->ipv4_queue_head;
576 if (udpw->session == s)
578 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
580 if (udpw->cont != NULL)
581 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
587 udpw = plugin->ipv6_queue_head;
591 if (udpw->session == s)
593 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
595 if (udpw->cont != NULL)
596 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
602 plugin->env->session_end (plugin->env->cls, &s->target, s);
604 GNUNET_assert (GNUNET_YES ==
605 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
606 &s->target.hashPubKey,
616 * Disconnect from a remote node. Clean up session if we have one for this peer
618 * @param cls closure for this call (should be handle to Plugin)
619 * @param target the peeridentity of the peer to disconnect
620 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
623 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
625 struct Plugin *plugin = cls;
626 GNUNET_assert (plugin != NULL);
628 GNUNET_assert (target != NULL);
630 LOG (GNUNET_ERROR_TYPE_DEBUG,
631 "Disconnecting from peer `%s'\n", GNUNET_i2s (target));
633 /* Clean up sessions */
634 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin);
637 static struct Session *
638 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
639 const void *addr, size_t addrlen,
640 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
643 const struct IPv4UdpAddress *t4;
644 const struct IPv6UdpAddress *t6;
645 struct sockaddr_in *v4;
646 struct sockaddr_in6 *v6;
651 case sizeof (struct IPv4UdpAddress):
652 if (NULL == plugin->sockv4)
657 s = GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in));
658 len = sizeof (struct sockaddr_in);
659 v4 = (struct sockaddr_in *) &s[1];
660 v4->sin_family = AF_INET;
661 #if HAVE_SOCKADDR_IN_SIN_LEN
662 v4->sin_len = sizeof (struct sockaddr_in);
664 v4->sin_port = t4->u4_port;
665 v4->sin_addr.s_addr = t4->ipv4_addr;
666 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v4, sizeof (struct sockaddr_in));
668 case sizeof (struct IPv6UdpAddress):
669 if (NULL == plugin->sockv6)
675 GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6));
676 len = sizeof (struct sockaddr_in6);
677 v6 = (struct sockaddr_in6 *) &s[1];
678 v6->sin6_family = AF_INET6;
679 #if HAVE_SOCKADDR_IN_SIN_LEN
680 v6->sin6_len = sizeof (struct sockaddr_in6);
682 v6->sin6_port = t6->u6_port;
683 v6->sin6_addr = t6->ipv6_addr;
684 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v6, sizeof (struct sockaddr_in6));
687 /* Must have a valid address to send to */
694 s->sock_addr = (const struct sockaddr *) &s[1];
695 s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero();
696 s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero();
697 s->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
702 static int session_cmp_it (void *cls,
703 const GNUNET_HashCode * key,
706 struct SessionCompareContext * cctx = cls;
707 const struct GNUNET_HELLO_Address *address = cctx->addr;
708 struct Session *s = value;
710 socklen_t s_addrlen = s->addrlen;
713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing address %s <-> %s\n",
714 udp_address_to_string (NULL, (void *) address->address, address->address_length),
715 GNUNET_a2s (s->sock_addr, s->addrlen));
718 if ((address->address_length == sizeof (struct IPv4UdpAddress)) &&
719 (s_addrlen == sizeof (struct sockaddr_in)))
721 struct IPv4UdpAddress * u4 = NULL;
722 u4 = (struct IPv4UdpAddress *) address->address;
723 const struct sockaddr_in *s4 = (const struct sockaddr_in *) s->sock_addr;
724 if ((0 == memcmp ((const void *) &u4->ipv4_addr,(const void *) &s4->sin_addr, sizeof (struct in_addr))) &&
725 (u4->u4_port == s4->sin_port))
732 if ((address->address_length == sizeof (struct IPv6UdpAddress)) &&
733 (s_addrlen == sizeof (struct sockaddr_in6)))
735 struct IPv6UdpAddress * u6 = NULL;
736 u6 = (struct IPv6UdpAddress *) address->address;
737 const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) s->sock_addr;
738 if ((0 == memcmp (&u6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr))) &&
739 (u6->u6_port == s6->sin6_port))
752 * Creates a new outbound session the transport service will use to send data to the
755 * @param cls the plugin
756 * @param address the address
757 * @return the session or NULL of max connections exceeded
759 static struct Session *
760 udp_plugin_get_session (void *cls,
761 const struct GNUNET_HELLO_Address *address)
763 struct Session * s = NULL;
764 struct Plugin * plugin = cls;
765 struct IPv6UdpAddress * udp_a6;
766 struct IPv4UdpAddress * udp_a4;
768 GNUNET_assert (plugin != NULL);
769 GNUNET_assert (address != NULL);
772 if ((address->address == NULL) ||
773 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
774 (address->address_length != sizeof (struct IPv6UdpAddress))))
780 if (address->address_length == sizeof (struct IPv4UdpAddress))
782 if (plugin->sockv4 == NULL)
784 udp_a4 = (struct IPv4UdpAddress *) address->address;
785 if (udp_a4->u4_port == 0)
789 if (address->address_length == sizeof (struct IPv6UdpAddress))
791 if (plugin->sockv6 == NULL)
793 udp_a6 = (struct IPv6UdpAddress *) address->address;
794 if (udp_a6->u6_port == 0)
798 /* check if session already exists */
799 struct SessionCompareContext cctx;
803 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));
805 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx);
806 if (cctx.res != NULL)
809 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res);
814 /* otherwise create new */
815 s = create_session (plugin,
818 address->address_length,
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Creating new session %p for peer `%s' address `%s'\n",
824 GNUNET_i2s(&address->peer),
825 udp_address_to_string(NULL,address->address,address->address_length));
827 GNUNET_assert (GNUNET_OK ==
828 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
829 &s->target.hashPubKey,
831 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
836 static void enqueue (struct Plugin *plugin, struct UDPMessageWrapper * udpw)
839 if (udpw->session->addrlen == sizeof (struct sockaddr_in))
840 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
841 if (udpw->session->addrlen == sizeof (struct sockaddr_in6))
842 GNUNET_CONTAINER_DLL_insert(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
846 * Function that is called with messages created by the fragmentation
847 * module. In the case of the 'proc' callback of the
848 * GNUNET_FRAGMENT_context_create function, this function must
849 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
851 * @param cls closure, the 'struct FragmentationContext'
852 * @param msg the message that was created
855 enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
857 struct FragmentationContext *frag_ctx = cls;
858 struct Plugin *plugin = frag_ctx->plugin;
859 struct UDPMessageWrapper * udpw;
862 size_t msg_len = ntohs (msg->size);
865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper));
868 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msg_len);
869 udpw->session = frag_ctx->session;
871 udpw->udp = (char *) &udpw[1];
873 udpw->msg_size = msg_len;
874 udpw->cont = frag_ctx->cont;
875 udpw->cont_cls = frag_ctx->cont_cls;
876 udpw->timeout = frag_ctx->timeout;
877 udpw->frag_ctx = frag_ctx;
878 memcpy (udpw->udp, msg, msg_len);
880 enqueue (plugin, udpw);
883 if (s->addrlen == sizeof (struct sockaddr_in))
885 if (plugin->with_v4_ws == GNUNET_NO)
887 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
888 GNUNET_SCHEDULER_cancel(plugin->select_task);
890 plugin->select_task =
891 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
892 GNUNET_SCHEDULER_NO_TASK,
893 GNUNET_TIME_UNIT_FOREVER_REL,
896 &udp_plugin_select, plugin);
897 plugin->with_v4_ws = GNUNET_YES;
901 else if (s->addrlen == sizeof (struct sockaddr_in6))
903 if (plugin->with_v6_ws == GNUNET_NO)
905 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
906 GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
908 plugin->select_task_v6 =
909 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
910 GNUNET_SCHEDULER_NO_TASK,
911 GNUNET_TIME_UNIT_FOREVER_REL,
914 &udp_plugin_select_v6, plugin);
915 plugin->with_v6_ws = GNUNET_YES;
925 * Function that can be used by the transport service to transmit
926 * a message using the plugin. Note that in the case of a
927 * peer disconnecting, the continuation MUST be called
928 * prior to the disconnect notification itself. This function
929 * will be called with this peer's HELLO message to initiate
930 * a fresh connection to another peer.
933 * @param s which session must be used
934 * @param msgbuf the message to transmit
935 * @param msgbuf_size number of bytes in 'msgbuf'
936 * @param priority how important is the message (most plugins will
937 * ignore message priority and just FIFO)
938 * @param to how long to wait at most for the transmission (does not
939 * require plugins to discard the message after the timeout,
940 * just advisory for the desired delay; most plugins will ignore
942 * @param cont continuation to call once the message has
943 * been transmitted (or if the transport is ready
944 * for the next transmission call; or if the
945 * peer disconnected...); can be NULL
946 * @param cont_cls closure for cont
947 * @return number of bytes used (on the physical network, with overheads);
948 * -1 on hard errors (i.e. address invalid); 0 is a legal value
949 * and does NOT mean that the message was not transmitted (DV)
952 udp_plugin_send (void *cls,
954 const char *msgbuf, size_t msgbuf_size,
955 unsigned int priority,
956 struct GNUNET_TIME_Relative to,
957 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
959 struct Plugin *plugin = cls;
960 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
962 struct UDPMessageWrapper * udpw;
963 struct UDPMessage *udp;
965 GNUNET_assert (plugin != NULL);
966 GNUNET_assert (s != NULL);
968 if ((s->addrlen == sizeof (struct sockaddr_in6)) && (plugin->sockv6 == NULL))
969 return GNUNET_SYSERR;
971 if ((s->addrlen == sizeof (struct sockaddr_in)) && (plugin->sockv4 == NULL))
972 return GNUNET_SYSERR;
975 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
978 return GNUNET_SYSERR;
981 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessions, &s->target.hashPubKey, s))
984 return GNUNET_SYSERR;
987 LOG (GNUNET_ERROR_TYPE_DEBUG,
988 "UDP transmits %u-byte message to `%s' using address `%s'\n",
990 GNUNET_i2s (&s->target),
991 GNUNET_a2s(s->sock_addr, s->addrlen));
994 udp = (struct UDPMessage *) mbuf;
995 udp->header.size = htons (mlen);
996 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
997 udp->reserved = htonl (0);
998 udp->sender = *plugin->env->my_identity;
1000 if (mlen <= UDP_MTU)
1002 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + mlen);
1004 udpw->udp = (char *) &udpw[1];
1005 udpw->msg_size = mlen;
1006 udpw->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
1008 udpw->cont_cls = cont_cls;
1009 udpw->frag_ctx = NULL;
1011 memcpy (udpw->udp, udp, sizeof (struct UDPMessage));
1012 memcpy (&udpw->udp[sizeof (struct UDPMessage)], msgbuf, msgbuf_size);
1014 enqueue (plugin, udpw);
1018 LOG (GNUNET_ERROR_TYPE_DEBUG,
1019 "UDP has to fragment message \n");
1020 if (s->frag_ctx != NULL)
1021 return GNUNET_SYSERR;
1022 memcpy (&udp[1], msgbuf, msgbuf_size);
1023 struct FragmentationContext * frag_ctx = GNUNET_malloc(sizeof (struct FragmentationContext));
1025 frag_ctx->plugin = plugin;
1026 frag_ctx->session = s;
1027 frag_ctx->cont = cont;
1028 frag_ctx->cont_cls = cont_cls;
1029 frag_ctx->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
1030 frag_ctx->bytes_to_send = mlen;
1031 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
1034 s->last_expected_delay,
1039 s->frag_ctx = frag_ctx;
1043 if (s->addrlen == sizeof (struct sockaddr_in))
1045 if (plugin->with_v4_ws == GNUNET_NO)
1047 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1048 GNUNET_SCHEDULER_cancel(plugin->select_task);
1050 plugin->select_task =
1051 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1052 GNUNET_SCHEDULER_NO_TASK,
1053 GNUNET_TIME_UNIT_FOREVER_REL,
1056 &udp_plugin_select, plugin);
1057 plugin->with_v4_ws = GNUNET_YES;
1061 else if (s->addrlen == sizeof (struct sockaddr_in6))
1063 if (plugin->with_v6_ws == GNUNET_NO)
1065 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1066 GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
1068 plugin->select_task_v6 =
1069 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1070 GNUNET_SCHEDULER_NO_TASK,
1071 GNUNET_TIME_UNIT_FOREVER_REL,
1074 &udp_plugin_select_v6, plugin);
1075 plugin->with_v6_ws = GNUNET_YES;
1084 * Our external IP address/port mapping has changed.
1086 * @param cls closure, the 'struct LocalAddrList'
1087 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
1088 * the previous (now invalid) one
1089 * @param addr either the previous or the new public IP address
1090 * @param addrlen actual lenght of the address
1093 udp_nat_port_map_callback (void *cls, int add_remove,
1094 const struct sockaddr *addr, socklen_t addrlen)
1096 struct Plugin *plugin = cls;
1097 struct IPv4UdpAddress u4;
1098 struct IPv6UdpAddress u6;
1102 /* convert 'addr' to our internal format */
1103 switch (addr->sa_family)
1106 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1107 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1108 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1113 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1114 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1115 sizeof (struct in6_addr));
1116 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1124 /* modify our published address list */
1125 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1131 * Message tokenizer has broken up an incomming message. Pass it on
1134 * @param cls the 'struct Plugin'
1135 * @param client the 'struct SourceInformation'
1136 * @param hdr the actual message
1139 process_inbound_tokenized_messages (void *cls, void *client,
1140 const struct GNUNET_MessageHeader *hdr)
1142 struct Plugin *plugin = cls;
1143 struct SourceInformation *si = client;
1144 struct GNUNET_ATS_Information ats[2];
1145 struct GNUNET_TIME_Relative delay;
1147 GNUNET_assert (si->session != NULL);
1149 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1150 ats[0].value = htonl (1);
1151 ats[1] = si->session->ats;
1152 GNUNET_break (ntohl(ats[1].value) != GNUNET_ATS_NET_UNSPECIFIED);
1154 delay = plugin->env->receive (plugin->env->cls,
1157 (const struct GNUNET_ATS_Information *) &ats, 2,
1161 si->session->flow_delay_for_other_peer = delay;
1166 * We've received a UDP Message. Process it (pass contents to main service).
1168 * @param plugin plugin context
1169 * @param msg the message
1170 * @param sender_addr sender address
1171 * @param sender_addr_len number of bytes in sender_addr
1174 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
1175 const struct sockaddr *sender_addr,
1176 socklen_t sender_addr_len)
1178 struct SourceInformation si;
1179 struct Session * s = NULL;
1180 struct IPv4UdpAddress u4;
1181 struct IPv6UdpAddress u6;
1185 if (0 != ntohl (msg->reserved))
1187 GNUNET_break_op (0);
1190 if (ntohs (msg->header.size) <
1191 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
1193 GNUNET_break_op (0);
1197 /* convert address */
1198 switch (sender_addr->sa_family)
1201 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
1202 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
1203 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1208 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
1209 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
1210 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
1219 LOG (GNUNET_ERROR_TYPE_DEBUG,
1220 "Received message with %u bytes from peer `%s' at `%s'\n",
1221 (unsigned int) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1222 GNUNET_a2s (sender_addr, sender_addr_len));
1225 struct GNUNET_HELLO_Address * address = GNUNET_HELLO_address_allocate(&msg->sender, "udp", arg, args);
1226 s = udp_plugin_get_session(plugin, address);
1227 GNUNET_free (address);
1229 /* iterate over all embedded messages */
1231 si.sender = msg->sender;
1235 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1236 ntohs (msg->header.size) -
1237 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1242 * Scan the heap for a receive context with the given address.
1244 * @param cls the 'struct FindReceiveContext'
1245 * @param node internal node of the heap
1246 * @param element value stored at the node (a 'struct ReceiveContext')
1247 * @param cost cost associated with the node
1248 * @return GNUNET_YES if we should continue to iterate,
1252 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1253 void *element, GNUNET_CONTAINER_HeapCostType cost)
1255 struct FindReceiveContext *frc = cls;
1256 struct DefragContext *e = element;
1258 if ((frc->addr_len == e->addr_len) &&
1259 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1269 * Process a defragmented message.
1271 * @param cls the 'struct ReceiveContext'
1272 * @param msg the message
1275 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1277 struct DefragContext *rc = cls;
1279 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1284 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1289 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1290 rc->src_addr, rc->addr_len);
1293 struct LookupContext
1295 const struct sockaddr * addr;
1298 struct Session *res;
1302 lookup_session_by_addr_it (void *cls, const GNUNET_HashCode * key, void *value)
1304 struct LookupContext *l_ctx = cls;
1305 struct Session * s = value;
1307 if ((s->addrlen == l_ctx->addrlen) &&
1308 (0 == memcmp (s->sock_addr, l_ctx->addr, s->addrlen)))
1317 * Transmit an acknowledgement.
1319 * @param cls the 'struct ReceiveContext'
1320 * @param id message ID (unused)
1321 * @param msg ack to transmit
1324 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1326 struct DefragContext *rc = cls;
1328 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1329 struct UDP_ACK_Message *udp_ack;
1331 struct UDPMessageWrapper *udpw;
1334 struct LookupContext l_ctx;
1335 l_ctx.addr = rc->src_addr;
1336 l_ctx.addrlen = rc->addr_len;
1338 GNUNET_CONTAINER_multihashmap_iterate (rc->plugin->sessions,
1339 &lookup_session_by_addr_it,
1343 GNUNET_assert (s != NULL);
1345 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1346 delay = s->flow_delay_for_other_peer.rel_value;
1349 LOG (GNUNET_ERROR_TYPE_DEBUG,
1350 "Sending ACK to `%s' including delay of %u ms\n",
1351 GNUNET_a2s (rc->src_addr,
1352 (rc->src_addr->sa_family ==
1353 AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct
1357 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msize);
1359 udpw->cont_cls = NULL;
1360 udpw->frag_ctx = NULL;
1361 udpw->msg_size = msize;
1363 udpw->timeout = GNUNET_TIME_absolute_get_forever();
1364 udpw->udp = (char *)&udpw[1];
1366 udp_ack = (struct UDP_ACK_Message *) udpw->udp;
1367 udp_ack->header.size = htons ((uint16_t) msize);
1368 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1369 udp_ack->delay = htonl (delay);
1370 udp_ack->sender = *rc->plugin->env->my_identity;
1371 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1373 enqueue (rc->plugin, udpw);
1377 static void read_process_msg (struct Plugin *plugin,
1378 const struct GNUNET_MessageHeader *msg,
1382 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1384 GNUNET_break_op (0);
1387 process_udp_message (plugin, (const struct UDPMessage *) msg,
1388 (const struct sockaddr *) addr, fromlen);
1392 static void read_process_ack (struct Plugin *plugin,
1393 const struct GNUNET_MessageHeader *msg,
1397 const struct GNUNET_MessageHeader *ack;
1398 const struct UDP_ACK_Message *udp_ack;
1399 struct LookupContext l_ctx;
1400 struct Session *s = NULL;
1401 struct GNUNET_TIME_Relative flow_delay;
1403 if (ntohs (msg->size) <
1404 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1406 GNUNET_break_op (0);
1410 udp_ack = (const struct UDP_ACK_Message *) msg;
1412 l_ctx.addr = (const struct sockaddr *) addr;
1413 l_ctx.addrlen = fromlen;
1415 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions,
1416 &lookup_session_by_addr_it,
1420 if ((s == NULL) || (s->frag_ctx == NULL))
1423 flow_delay.rel_value = (uint64_t) ntohl (udp_ack->delay);
1424 LOG (GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %llu\n",
1425 flow_delay.rel_value);
1426 s->flow_delay_from_other_peer =
1427 GNUNET_TIME_relative_to_absolute (flow_delay);
1429 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1430 if (ntohs (ack->size) !=
1431 ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1433 GNUNET_break_op (0);
1437 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack))
1440 LOG (GNUNET_ERROR_TYPE_DEBUG,
1441 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1442 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1443 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1449 LOG (GNUNET_ERROR_TYPE_DEBUG,
1450 "FULL MESSAGE ACKed\n",
1451 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1452 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1454 s->last_expected_delay = GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag);
1456 struct UDPMessageWrapper * udpw = NULL;
1457 if (s->addrlen == sizeof (struct sockaddr_in6))
1459 udpw = plugin->ipv6_queue_head;
1462 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1464 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1470 if (s->addrlen == sizeof (struct sockaddr_in))
1472 udpw = plugin->ipv4_queue_head;
1475 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1477 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1484 if (s->frag_ctx->cont != NULL)
1486 (s->frag_ctx->cont_cls, &udp_ack->sender, GNUNET_OK);
1487 GNUNET_free (s->frag_ctx);
1492 static void read_process_fragment (struct Plugin *plugin,
1493 const struct GNUNET_MessageHeader *msg,
1497 struct DefragContext *d_ctx;
1498 struct GNUNET_TIME_Absolute now;
1499 struct FindReceiveContext frc;
1503 frc.addr = (const struct sockaddr *) addr;
1504 frc.addr_len = fromlen;
1507 LOG (GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
1508 (unsigned int) ntohs (msg->size),
1509 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1512 /* Lookup existing receive context for this address */
1513 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1514 &find_receive_context,
1516 now = GNUNET_TIME_absolute_get ();
1521 /* Create a new defragmentation context */
1522 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + fromlen);
1523 memcpy (&d_ctx[1], addr, fromlen);
1524 d_ctx->src_addr = (const struct sockaddr *) &d_ctx[1];
1525 d_ctx->addr_len = fromlen;
1526 d_ctx->plugin = plugin;
1528 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1529 UDP_MAX_MESSAGES_IN_DEFRAG, d_ctx,
1530 &fragment_msg_proc, &ack_proc);
1532 GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, d_ctx,
1533 (GNUNET_CONTAINER_HeapCostType)
1536 LOG (GNUNET_ERROR_TYPE_DEBUG, "Created new defragmentation context for %u-byte fragment from `%s'\n",
1537 (unsigned int) ntohs (msg->size),
1538 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1544 LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing defragmentation context for %u-byte fragment from `%s'\n",
1545 (unsigned int) ntohs (msg->size),
1546 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1550 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
1552 /* keep this 'rc' from expiring */
1553 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs, d_ctx->hnode,
1554 (GNUNET_CONTAINER_HeapCostType)
1557 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
1558 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1560 /* remove 'rc' that was inactive the longest */
1561 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
1562 GNUNET_assert (NULL != d_ctx);
1563 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1564 GNUNET_free (d_ctx);
1569 * Read and process a message from the given socket.
1571 * @param plugin the overall plugin
1572 * @param rsock socket to read from
1575 udp_select_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1581 const struct GNUNET_MessageHeader *msg;
1583 fromlen = sizeof (addr);
1584 memset (&addr, 0, sizeof (addr));
1585 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1586 (struct sockaddr *) &addr, &fromlen);
1588 if (size < sizeof (struct GNUNET_MessageHeader))
1590 GNUNET_break_op (0);
1593 msg = (const struct GNUNET_MessageHeader *) buf;
1595 LOG (GNUNET_ERROR_TYPE_DEBUG,
1596 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) size,
1597 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs (msg->type));
1599 if (size != ntohs (msg->size))
1601 GNUNET_break_op (0);
1605 switch (ntohs (msg->type))
1607 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
1608 udp_broadcast_receive (plugin, &buf, size, addr, fromlen);
1611 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1612 read_process_msg (plugin, msg, addr, fromlen);
1615 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1616 read_process_ack (plugin, msg, addr, fromlen);;
1619 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1620 read_process_fragment (plugin, msg, addr, fromlen);
1624 GNUNET_break_op (0);
1630 udp_select_send (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *sock)
1634 struct GNUNET_TIME_Absolute max;
1635 struct GNUNET_TIME_Absolute ;
1637 struct UDPMessageWrapper *udpw = NULL;
1639 if (sock == plugin->sockv4)
1641 udpw = plugin->ipv4_queue_head;
1643 else if (sock == plugin->sockv6)
1645 udpw = plugin->ipv6_queue_head;
1653 const struct sockaddr * sa = udpw->session->sock_addr;
1654 slen = udpw->session->addrlen;
1656 max = GNUNET_TIME_absolute_max(udpw->timeout, GNUNET_TIME_absolute_get());
1658 while (udpw != NULL)
1660 if (max.abs_value != udpw->timeout.abs_value)
1662 /* Message timed out */
1664 if (udpw->cont != NULL)
1665 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1666 if (udpw->frag_ctx != NULL)
1669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Fragmented message for peer `%s' with size %u timed out\n",
1670 GNUNET_i2s(&udpw->session->target), udpw->frag_ctx->bytes_to_send);
1672 udpw->session->last_expected_delay = GNUNET_FRAGMENT_context_destroy(udpw->frag_ctx->frag);
1673 GNUNET_free (udpw->frag_ctx);
1674 udpw->session->frag_ctx = NULL;
1679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' with size %u timed out\n",
1680 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1684 if (sock == plugin->sockv4)
1686 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1688 udpw = plugin->ipv4_queue_head;
1690 else if (sock == plugin->sockv6)
1692 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1694 udpw = plugin->ipv6_queue_head;
1699 struct GNUNET_TIME_Relative delta = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
1700 if (delta.rel_value == 0)
1702 /* this message is not delayed */
1703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is not delayed \n",
1704 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1709 /* this message is delayed, try next */
1710 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is delayed for %llu \n",
1711 GNUNET_i2s(&udpw->session->target), udpw->msg_size,
1721 /* No message left */
1725 sent = GNUNET_NETWORK_socket_sendto (sock, udpw->udp, udpw->msg_size, sa, slen);
1727 if (GNUNET_SYSERR == sent)
1729 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
1730 LOG (GNUNET_ERROR_TYPE_DEBUG,
1731 "UDP transmitted %u-byte message to %s (%d: %s)\n",
1732 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1733 (sent < 0) ? STRERROR (errno) : "ok");
1734 if (udpw->cont != NULL)
1735 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1737 LOG (GNUNET_ERROR_TYPE_DEBUG,
1738 "UDP transmitted %u-byte message to %s (%d: %s)\n",
1739 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1740 (sent < 0) ? STRERROR (errno) : "ok");
1742 /* This was just a message fragment */
1743 if (udpw->frag_ctx != NULL)
1745 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1747 /* This was a complete message*/
1750 if (udpw->cont != NULL)
1751 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_OK);
1754 if (sock == plugin->sockv4)
1755 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1756 else if (sock == plugin->sockv6)
1757 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1765 * We have been notified that our readset has something to read. We don't
1766 * know which socket needs to be read, so we have to check each one
1767 * Then reschedule this function to be called again once more is available.
1769 * @param cls the plugin handle
1770 * @param tc the scheduling context (for rescheduling this function again)
1773 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1775 struct Plugin *plugin = cls;
1777 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1778 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1780 plugin->with_v4_ws = GNUNET_NO;
1782 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1784 if ((NULL != plugin->sockv4) &&
1785 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1786 udp_select_read (plugin, plugin->sockv4);
1790 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1792 if ((NULL != plugin->sockv4) && (plugin->ipv4_queue_head != NULL) &&
1793 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv4)))
1795 udp_select_send (plugin, plugin->sockv4);
1799 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1800 GNUNET_SCHEDULER_cancel (plugin->select_task);
1801 plugin->select_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1802 GNUNET_SCHEDULER_NO_TASK,
1803 GNUNET_TIME_UNIT_FOREVER_REL,
1805 (plugin->ipv4_queue_head != NULL) ? plugin->ws_v4 : NULL,
1806 &udp_plugin_select, plugin);
1807 if (plugin->ipv4_queue_head != NULL)
1808 plugin->with_v4_ws = GNUNET_YES;
1810 plugin->with_v4_ws = GNUNET_NO;
1815 * We have been notified that our readset has something to read. We don't
1816 * know which socket needs to be read, so we have to check each one
1817 * Then reschedule this function to be called again once more is available.
1819 * @param cls the plugin handle
1820 * @param tc the scheduling context (for rescheduling this function again)
1823 udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1825 struct Plugin *plugin = cls;
1827 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1828 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1831 plugin->with_v6_ws = GNUNET_NO;
1832 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1834 if ((NULL != plugin->sockv6) &&
1835 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1836 udp_select_read (plugin, plugin->sockv6);
1839 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1841 if ((NULL != plugin->sockv6) && (plugin->ipv6_queue_head != NULL) &&
1842 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv6)))
1844 udp_select_send (plugin, plugin->sockv6);
1847 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1848 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
1849 plugin->select_task_v6 = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1850 GNUNET_SCHEDULER_NO_TASK,
1851 GNUNET_TIME_UNIT_FOREVER_REL,
1853 (plugin->ipv6_queue_head != NULL) ? plugin->ws_v6 : NULL,
1854 &udp_plugin_select_v6, plugin);
1855 if (plugin->ipv6_queue_head != NULL)
1856 plugin->with_v6_ws = GNUNET_YES;
1858 plugin->with_v6_ws = GNUNET_NO;
1863 setup_sockets (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
1866 int sockets_created = 0;
1867 struct sockaddr *serverAddr;
1868 struct sockaddr *addrs[2];
1869 socklen_t addrlens[2];
1872 /* Create IPv6 socket */
1873 if (plugin->enable_ipv6 == GNUNET_YES)
1875 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1876 if (NULL == plugin->sockv6)
1878 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Disabling IPv6 since it is not supported on this system!\n");
1879 plugin->enable_ipv6 = GNUNET_NO;
1883 #if HAVE_SOCKADDR_IN_SIN_LEN
1884 serverAddrv6->sin6_len = sizeof (serverAddrv6);
1886 serverAddrv6->sin6_family = AF_INET6;
1887 serverAddrv6->sin6_addr = in6addr_any;
1888 serverAddrv6->sin6_port = htons (plugin->port);
1889 addrlen = sizeof (struct sockaddr_in6);
1890 serverAddr = (struct sockaddr *) serverAddrv6;
1892 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1893 ntohs (serverAddrv6->sin6_port));
1896 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1899 serverAddrv6->sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1901 LOG (GNUNET_ERROR_TYPE_DEBUG,
1902 "IPv6 Binding failed, trying new port %d\n",
1903 ntohs (serverAddrv6->sin6_port));
1908 GNUNET_NETWORK_socket_close (plugin->sockv6);
1909 plugin->sockv6 = NULL;
1913 if (plugin->sockv6 != NULL)
1916 LOG (GNUNET_ERROR_TYPE_DEBUG,
1917 "IPv6 socket created on port %d\n",
1918 ntohs (serverAddrv6->sin6_port));
1920 addrs[sockets_created] = (struct sockaddr *) serverAddrv6;
1921 addrlens[sockets_created] = sizeof (struct sockaddr_in6);
1927 /* Create IPv4 socket */
1928 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1929 if (NULL == plugin->sockv4)
1931 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1935 #if HAVE_SOCKADDR_IN_SIN_LEN
1936 serverAddrv4->sin_len = sizeof (serverAddrv4);
1938 serverAddrv4->sin_family = AF_INET;
1939 serverAddrv4->sin_addr.s_addr = INADDR_ANY;
1940 serverAddrv4->sin_port = htons (plugin->port);
1941 addrlen = sizeof (struct sockaddr_in);
1942 serverAddr = (struct sockaddr *) serverAddrv4;
1945 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1946 ntohs (serverAddrv4->sin_port));
1949 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1952 serverAddrv4->sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1954 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
1955 ntohs (serverAddrv4->sin_port));
1960 GNUNET_NETWORK_socket_close (plugin->sockv4);
1961 plugin->sockv4 = NULL;
1965 if (plugin->sockv4 != NULL)
1967 addrs[sockets_created] = (struct sockaddr *) serverAddrv4;
1968 addrlens[sockets_created] = sizeof (struct sockaddr_in);
1973 /* Create file descriptors */
1974 plugin->rs_v4 = GNUNET_NETWORK_fdset_create ();
1975 plugin->ws_v4 = GNUNET_NETWORK_fdset_create ();
1976 GNUNET_NETWORK_fdset_zero (plugin->rs_v4);
1977 GNUNET_NETWORK_fdset_zero (plugin->ws_v4);
1978 if (NULL != plugin->sockv4)
1980 GNUNET_NETWORK_fdset_set (plugin->rs_v4, plugin->sockv4);
1981 GNUNET_NETWORK_fdset_set (plugin->ws_v4, plugin->sockv4);
1984 if (sockets_created == 0)
1985 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
1987 plugin->select_task =
1988 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1989 GNUNET_SCHEDULER_NO_TASK,
1990 GNUNET_TIME_UNIT_FOREVER_REL,
1993 &udp_plugin_select, plugin);
1994 plugin->with_v4_ws = GNUNET_NO;
1996 if (plugin->enable_ipv6 == GNUNET_YES)
1998 plugin->rs_v6 = GNUNET_NETWORK_fdset_create ();
1999 plugin->ws_v6 = GNUNET_NETWORK_fdset_create ();
2000 GNUNET_NETWORK_fdset_zero (plugin->rs_v6);
2001 GNUNET_NETWORK_fdset_zero (plugin->ws_v6);
2002 if (NULL != plugin->sockv6)
2004 GNUNET_NETWORK_fdset_set (plugin->rs_v6, plugin->sockv6);
2005 GNUNET_NETWORK_fdset_set (plugin->ws_v6, plugin->sockv6);
2008 plugin->select_task_v6 =
2009 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2010 GNUNET_SCHEDULER_NO_TASK,
2011 GNUNET_TIME_UNIT_FOREVER_REL,
2014 &udp_plugin_select_v6, plugin);
2015 plugin->with_v6_ws = GNUNET_NO;
2018 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
2019 GNUNET_NO, plugin->port,
2021 (const struct sockaddr **) addrs, addrlens,
2022 &udp_nat_port_map_callback, NULL, plugin);
2024 return sockets_created;
2029 * The exported method. Makes the core api available via a global and
2030 * returns the udp transport API.
2032 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2033 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
2036 libgnunet_plugin_transport_udp_init (void *cls)
2038 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2039 struct GNUNET_TRANSPORT_PluginFunctions *api;
2040 struct Plugin *plugin;
2042 unsigned long long port;
2043 unsigned long long aport;
2044 unsigned long long broadcast;
2045 unsigned long long udp_max_bps;
2046 unsigned long long enable_v6;
2047 char * bind4_address;
2048 char * bind6_address;
2049 struct GNUNET_TIME_Relative interval;
2051 struct sockaddr_in serverAddrv4;
2052 struct sockaddr_in6 serverAddrv6;
2056 if (NULL == env->receive)
2058 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2059 initialze the plugin or the API */
2060 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2062 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2063 api->address_to_string = &udp_address_to_string;
2064 api->string_to_address = NULL; // FIXME!
2068 /* Get port number */
2070 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
2074 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2075 "ADVERTISED_PORT", &aport))
2079 LOG (GNUNET_ERROR_TYPE_WARNING,
2080 _("Given `%s' option is out of range: %llu > %u\n"), "PORT", port,
2087 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat",
2090 enable_v6 = GNUNET_NO;
2093 enable_v6 = GNUNET_YES;
2097 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
2098 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
2101 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2102 "BINDTO", &bind4_address))
2104 LOG (GNUNET_ERROR_TYPE_DEBUG,
2105 "Binding udp plugin to specific address: `%s'\n",
2107 if (1 != inet_pton (AF_INET, bind4_address, &serverAddrv4.sin_addr))
2109 GNUNET_free (bind4_address);
2115 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2116 "BINDTO6", &bind6_address))
2118 LOG (GNUNET_ERROR_TYPE_DEBUG,
2119 "Binding udp plugin to specific address: `%s'\n",
2122 inet_pton (AF_INET6, bind6_address, &serverAddrv6.sin6_addr))
2124 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
2126 GNUNET_free_non_null (bind4_address);
2127 GNUNET_free (bind6_address);
2133 /* Enable neighbour discovery */
2134 broadcast = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp",
2136 if (broadcast == GNUNET_SYSERR)
2137 broadcast = GNUNET_NO;
2139 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-udp",
2140 "BROADCAST_INTERVAL", &interval))
2142 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
2145 /* Maximum datarate */
2146 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2147 "MAX_BPS", &udp_max_bps))
2149 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
2152 plugin = GNUNET_malloc (sizeof (struct Plugin));
2153 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2155 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
2156 GNUNET_BANDWIDTH_value_init ((uint32_t)udp_max_bps), 30);
2159 plugin->sessions = GNUNET_CONTAINER_multihashmap_create (10);
2160 plugin->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
2161 plugin->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
2162 plugin->port = port;
2163 plugin->aport = aport;
2164 plugin->broadcast_interval = interval;
2165 plugin->enable_ipv6 = enable_v6;
2170 api->disconnect = &udp_disconnect;
2171 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2172 api->address_to_string = &udp_address_to_string;
2173 api->string_to_address = NULL; // FIXME!
2174 api->check_address = &udp_plugin_check_address;
2175 api->get_session = &udp_plugin_get_session;
2176 api->send = &udp_plugin_send;
2178 LOG (GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
2179 res = setup_sockets (plugin, &serverAddrv6, &serverAddrv4);
2180 if ((res == 0) || ((plugin->sockv4 == NULL) && (plugin->sockv6 == NULL)))
2182 LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to create network sockets, plugin failed\n");
2183 GNUNET_free (plugin);
2188 LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting broadcasting\n");
2189 if (broadcast == GNUNET_YES)
2190 setup_broadcast (plugin, &serverAddrv6, &serverAddrv4);
2193 GNUNET_free_non_null (bind4_address);
2194 GNUNET_free_non_null (bind6_address);
2200 heap_cleanup_iterator (void *cls,
2201 struct GNUNET_CONTAINER_HeapNode *
2202 node, void *element,
2203 GNUNET_CONTAINER_HeapCostType
2206 struct DefragContext * d_ctx = element;
2208 GNUNET_CONTAINER_heap_remove_node (node);
2209 GNUNET_DEFRAGMENT_context_destroy(d_ctx->defrag);
2210 GNUNET_free (d_ctx);
2217 * The exported method. Makes the core api available via a global and
2218 * returns the udp transport API.
2220 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2224 libgnunet_plugin_transport_udp_done (void *cls)
2226 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2227 struct Plugin *plugin = api->cls;
2235 stop_broadcast (plugin);
2237 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
2239 GNUNET_SCHEDULER_cancel (plugin->select_task);
2240 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
2242 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
2244 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
2245 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
2248 /* Closing sockets */
2249 if (plugin->sockv4 != NULL)
2251 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
2252 plugin->sockv4 = NULL;
2254 GNUNET_NETWORK_fdset_destroy (plugin->rs_v4);
2255 GNUNET_NETWORK_fdset_destroy (plugin->ws_v4);
2257 if (plugin->sockv6 != NULL)
2259 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
2260 plugin->sockv6 = NULL;
2262 GNUNET_NETWORK_fdset_destroy (plugin->rs_v6);
2263 GNUNET_NETWORK_fdset_destroy (plugin->ws_v6);
2266 GNUNET_NAT_unregister (plugin->nat);
2268 if (plugin->defrag_ctxs != NULL)
2270 GNUNET_CONTAINER_heap_iterate(plugin->defrag_ctxs,
2271 heap_cleanup_iterator, NULL);
2272 GNUNET_CONTAINER_heap_destroy(plugin->defrag_ctxs);
2273 plugin->defrag_ctxs = NULL;
2275 if (plugin->mst != NULL)
2277 GNUNET_SERVER_mst_destroy(plugin->mst);
2281 /* Clean up leftover messages */
2282 struct UDPMessageWrapper * udpw;
2283 udpw = plugin->ipv4_queue_head;
2284 while (udpw != NULL)
2286 struct UDPMessageWrapper *tmp = udpw->next;
2287 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
2288 if (udpw->cont != NULL)
2289 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2293 udpw = plugin->ipv6_queue_head;
2294 while (udpw != NULL)
2296 struct UDPMessageWrapper *tmp = udpw->next;
2297 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
2298 if (udpw->cont != NULL)
2299 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2304 /* Clean up sessions */
2306 LOG (GNUNET_ERROR_TYPE_DEBUG,
2307 "Cleaning up sessions\n");
2309 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &disconnect_and_free_it, plugin);
2310 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
2313 GNUNET_free (plugin);
2319 /* end of plugin_transport_udp.c */