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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_new.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 struct GNUNET_ATS_Information ats;
115 struct FragmentationContext * frag_ctx;
119 struct SessionCompareContext
122 const struct GNUNET_HELLO_Address *addr;
127 * Closure for 'process_inbound_tokenized_messages'
129 struct SourceInformation
134 struct GNUNET_PeerIdentity sender;
142 * Number of bytes in source address.
146 struct Session *session;
151 * Closure for 'find_receive_context'.
153 struct FindReceiveContext
156 * Where to store the result.
158 struct DefragContext *rc;
163 const struct sockaddr *addr;
166 * Number of bytes in 'addr'.
170 struct Session *session;
176 * Data structure to track defragmentation contexts based
177 * on the source of the UDP traffic.
183 * Defragmentation context.
185 struct GNUNET_DEFRAGMENT_Context *defrag;
188 * Source address this receive context is for (allocated at the
189 * end of the struct).
191 const struct sockaddr *src_addr;
194 * Reference to master plugin struct.
196 struct Plugin *plugin;
199 * Node in the defrag heap.
201 struct GNUNET_CONTAINER_HeapNode *hnode;
204 * Length of 'src_addr'
212 * Closure for 'process_inbound_tokenized_messages'
214 struct FragmentationContext
216 struct FragmentationContext * next;
217 struct FragmentationContext * prev;
219 struct Plugin * plugin;
220 struct GNUNET_FRAGMENT_Context * frag;
221 struct Session * session;
223 struct GNUNET_TIME_Absolute timeout;
227 * Function to call upon completion of the transmission.
229 GNUNET_TRANSPORT_TransmitContinuation cont;
232 * Closure for 'cont'.
236 size_t bytes_to_send;
240 struct UDPMessageWrapper
242 struct Session *session;
243 struct UDPMessageWrapper *prev;
244 struct UDPMessageWrapper *next;
248 struct GNUNET_TIME_Absolute timeout;
251 * Function to call upon completion of the transmission.
253 GNUNET_TRANSPORT_TransmitContinuation cont;
256 * Closure for 'cont'.
260 struct FragmentationContext *frag_ctx;
266 * UDP ACK Message-Packet header (after defragmentation).
268 struct UDP_ACK_Message
273 struct GNUNET_MessageHeader header;
276 * Desired delay for flow control
281 * What is the identity of the sender
283 struct GNUNET_PeerIdentity sender;
290 * Function called for a quick conversion of the binary address to
291 * a numeric address. Note that the caller must not free the
292 * address and that the next call to this function is allowed
293 * to override the address again.
296 * @param addr binary address
297 * @param addrlen length of the address
298 * @return string representing the same address
301 udp_address_to_string (void *cls, const void *addr, size_t addrlen)
303 static char rbuf[INET6_ADDRSTRLEN + 10];
304 char buf[INET6_ADDRSTRLEN];
308 const struct IPv4UdpAddress *t4;
309 const struct IPv6UdpAddress *t6;
313 if (addrlen == sizeof (struct IPv6UdpAddress))
317 port = ntohs (t6->u6_port);
318 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
321 else if (addrlen == sizeof (struct IPv4UdpAddress))
325 port = ntohs (t4->u4_port);
326 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
334 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
335 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
342 * Append our port and forward the result.
344 * @param cls a 'struct PrettyPrinterContext'
345 * @param hostname result from DNS resolver
348 append_port (void *cls, const char *hostname)
350 struct PrettyPrinterContext *ppc = cls;
353 if (hostname == NULL)
355 ppc->asc (ppc->asc_cls, NULL);
359 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
360 ppc->asc (ppc->asc_cls, ret);
366 * Convert the transports address to a nice, human-readable
370 * @param type name of the transport that generated the address
371 * @param addr one of the addresses of the host, NULL for the last address
372 * the specific address format depends on the transport
373 * @param addrlen length of the address
374 * @param numeric should (IP) addresses be displayed in numeric form?
375 * @param timeout after how long should we give up?
376 * @param asc function to call on each string
377 * @param asc_cls closure for asc
380 udp_plugin_address_pretty_printer (void *cls, const char *type,
381 const void *addr, size_t addrlen,
383 struct GNUNET_TIME_Relative timeout,
384 GNUNET_TRANSPORT_AddressStringCallback asc,
387 struct PrettyPrinterContext *ppc;
390 struct sockaddr_in a4;
391 struct sockaddr_in6 a6;
392 const struct IPv4UdpAddress *u4;
393 const struct IPv6UdpAddress *u6;
396 if (addrlen == sizeof (struct IPv6UdpAddress))
399 memset (&a6, 0, sizeof (a6));
400 a6.sin6_family = AF_INET6;
401 #if HAVE_SOCKADDR_IN_SIN_LEN
402 a6.sin6_len = sizeof (a6);
404 a6.sin6_port = u6->u6_port;
405 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
406 port = ntohs (u6->u6_port);
410 else if (addrlen == sizeof (struct IPv4UdpAddress))
413 memset (&a4, 0, sizeof (a4));
414 a4.sin_family = AF_INET;
415 #if HAVE_SOCKADDR_IN_SIN_LEN
416 a4.sin_len = sizeof (a4);
418 a4.sin_port = u4->u4_port;
419 a4.sin_addr.s_addr = u4->ipv4_addr;
420 port = ntohs (u4->u4_port);
426 /* invalid address */
431 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
433 ppc->asc_cls = asc_cls;
435 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
440 * Check if the given port is plausible (must be either our listen
441 * port or our advertised port). If it is neither, we return
444 * @param plugin global variables
445 * @param in_port port number to check
446 * @return GNUNET_OK if port is either open_port or adv_port
449 check_port (struct Plugin *plugin, uint16_t in_port)
451 if ((in_port == plugin->port) || (in_port == plugin->aport))
453 return GNUNET_SYSERR;
459 * Function that will be called to check if a binary address for this
460 * plugin is well-formed and corresponds to an address for THIS peer
461 * (as per our configuration). Naturally, if absolutely necessary,
462 * plugins can be a bit conservative in their answer, but in general
463 * plugins should make sure that the address does not redirect
464 * traffic to a 3rd party that might try to man-in-the-middle our
467 * @param cls closure, should be our handle to the Plugin
468 * @param addr pointer to the address
469 * @param addrlen length of addr
470 * @return GNUNET_OK if this is a plausible address for this peer
471 * and transport, GNUNET_SYSERR if not
475 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
477 struct Plugin *plugin = cls;
478 struct IPv4UdpAddress *v4;
479 struct IPv6UdpAddress *v6;
481 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
482 (addrlen != sizeof (struct IPv6UdpAddress)))
485 return GNUNET_SYSERR;
487 if (addrlen == sizeof (struct IPv4UdpAddress))
489 v4 = (struct IPv4UdpAddress *) addr;
490 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
491 return GNUNET_SYSERR;
493 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
494 sizeof (struct in_addr)))
495 return GNUNET_SYSERR;
499 v6 = (struct IPv6UdpAddress *) addr;
500 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
503 return GNUNET_SYSERR;
505 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
506 return GNUNET_SYSERR;
508 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
509 sizeof (struct in6_addr)))
510 return GNUNET_SYSERR;
517 * Destroy a session, plugin is being unloaded.
520 * @param key hash of public key of target peer
521 * @param value a 'struct PeerSession*' to clean up
522 * @return GNUNET_OK (continue to iterate)
525 disconnect_and_free_it (void *cls, const GNUNET_HashCode * key, void *value)
527 struct Plugin *plugin = cls;
528 struct Session *s = value;
529 struct UDPMessageWrapper *udpw;
532 LOG (GNUNET_ERROR_TYPE_DEBUG,
533 "Session %p to peer `%s' address ended \n",
535 GNUNET_i2s (&s->target),
536 GNUNET_a2s (s->sock_addr, s->addrlen));
538 plugin->env->session_end (plugin->env->cls, &s->target, s);
540 while (s->frag_ctx != NULL)
542 GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag);
543 GNUNET_free (s->frag_ctx);
547 udpw = plugin->msg_head;
550 if (udpw->session == s)
552 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
554 if (udpw->cont != NULL)
555 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
558 udpw = plugin->msg_head;
561 GNUNET_assert (GNUNET_YES ==
562 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
563 &s->target.hashPubKey,
573 * Disconnect from a remote node. Clean up session if we have one for this peer
575 * @param cls closure for this call (should be handle to Plugin)
576 * @param target the peeridentity of the peer to disconnect
577 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
580 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
582 struct Plugin *plugin = cls;
583 GNUNET_assert (plugin != NULL);
585 GNUNET_assert (target != NULL);
587 LOG (GNUNET_ERROR_TYPE_DEBUG,
588 "Disconnecting from peer `%s'\n", GNUNET_i2s (target));
590 /* Clean up sessions */
591 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin);
593 LOG (GNUNET_ERROR_TYPE_DEBUG,
594 "FREEED SESSIONS from peer `%s'\n", GNUNET_i2s (target));
597 static struct Session *
598 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
599 const void *addr, size_t addrlen,
600 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
603 const struct IPv4UdpAddress *t4;
604 const struct IPv6UdpAddress *t6;
605 struct sockaddr_in *v4;
606 struct sockaddr_in6 *v6;
611 case sizeof (struct IPv4UdpAddress):
612 if (NULL == plugin->sockv4)
617 s = GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in));
618 len = sizeof (struct sockaddr_in);
619 v4 = (struct sockaddr_in *) &s[1];
620 v4->sin_family = AF_INET;
621 #if HAVE_SOCKADDR_IN_SIN_LEN
622 v4->sin_len = sizeof (struct sockaddr_in);
624 v4->sin_port = t4->u4_port;
625 v4->sin_addr.s_addr = t4->ipv4_addr;
626 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v4, sizeof (struct sockaddr_in));
628 case sizeof (struct IPv6UdpAddress):
629 if (NULL == plugin->sockv6)
635 GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6));
636 len = sizeof (struct sockaddr_in6);
637 v6 = (struct sockaddr_in6 *) &s[1];
638 v6->sin6_family = AF_INET6;
639 #if HAVE_SOCKADDR_IN_SIN_LEN
640 v6->sin6_len = sizeof (struct sockaddr_in6);
642 v6->sin6_port = t6->u6_port;
643 v6->sin6_addr = t6->ipv6_addr;
644 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v6, sizeof (struct sockaddr_in6));
647 /* Must have a valid address to send to */
654 s->sock_addr = (const struct sockaddr *) &s[1];
655 s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero();
656 s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero();
661 static int session_cmp_it (void *cls,
662 const GNUNET_HashCode * key,
665 struct SessionCompareContext * cctx = cls;
666 const struct GNUNET_HELLO_Address *address = cctx->addr;
667 struct Session *s = value;
669 socklen_t s_addrlen = s->addrlen;
672 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing address %s <-> %s\n",
673 udp_address_to_string (NULL, (void *) address->address, address->address_length),
674 GNUNET_a2s (s->sock_addr, s->addrlen));
677 if ((address->address_length == sizeof (struct IPv4UdpAddress)) &&
678 (s_addrlen == sizeof (struct sockaddr_in)))
680 struct IPv4UdpAddress * u4 = NULL;
681 u4 = (struct IPv4UdpAddress *) address->address;
682 const struct sockaddr_in *s4 = (const struct sockaddr_in *) s->sock_addr;
683 if ((0 == memcmp ((const void *) &u4->ipv4_addr,(const void *) &s4->sin_addr, sizeof (struct in_addr))) &&
684 (u4->u4_port == s4->sin_port))
691 if ((address->address_length == sizeof (struct IPv6UdpAddress)) &&
692 (s_addrlen == sizeof (struct sockaddr_in6)))
694 struct IPv6UdpAddress * u6 = NULL;
695 u6 = (struct IPv6UdpAddress *) address->address;
696 const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) s->sock_addr;
697 if ((0 == memcmp (&u6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr))) &&
698 (u6->u6_port == s6->sin6_port))
711 * Creates a new outbound session the transport service will use to send data to the
714 * @param cls the plugin
715 * @param address the address
716 * @return the session or NULL of max connections exceeded
718 static struct Session *
719 udp_plugin_get_session (void *cls,
720 const struct GNUNET_HELLO_Address *address)
722 struct Session * s = NULL;
723 struct Plugin * plugin = cls;
725 GNUNET_assert (plugin != NULL);
726 GNUNET_assert (address != NULL);
728 if ((address->address == NULL) ||
729 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
730 (address->address_length != sizeof (struct IPv6UdpAddress))))
736 /* check if session already exists */
737 struct SessionCompareContext cctx;
741 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));
743 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx);
744 if (cctx.res != NULL)
747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res);
752 /* otherwise create new */
753 s = create_session (plugin,
756 address->address_length,
759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
760 "Creating new session %p for peer `%s' address `%s'\n",
762 GNUNET_i2s(&address->peer),
763 udp_address_to_string(NULL,address->address,address->address_length));
765 GNUNET_assert (GNUNET_OK ==
766 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
767 &s->target.hashPubKey,
769 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
775 * Function that is called with messages created by the fragmentation
776 * module. In the case of the 'proc' callback of the
777 * GNUNET_FRAGMENT_context_create function, this function must
778 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
780 * @param cls closure, the 'struct FragmentationContext'
781 * @param msg the message that was created
784 enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
786 struct FragmentationContext *frag_ctx = cls;
787 struct Plugin *plugin = frag_ctx->plugin;
788 struct UDPMessageWrapper * udpw;
790 size_t msg_len = ntohs (msg->size);
793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper));
796 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msg_len);
797 udpw->session = frag_ctx->session;
798 udpw->udp = (char *) &udpw[1];
800 udpw->msg_size = msg_len;
801 udpw->cont = frag_ctx->cont;
802 udpw->cont_cls = frag_ctx->cont_cls;
803 udpw->timeout = frag_ctx->timeout;
804 udpw->frag_ctx = frag_ctx;
805 memcpy (udpw->udp, msg, msg_len);
807 GNUNET_CONTAINER_DLL_insert(plugin->msg_head, plugin->msg_tail, udpw);
812 * Function that can be used by the transport service to transmit
813 * a message using the plugin. Note that in the case of a
814 * peer disconnecting, the continuation MUST be called
815 * prior to the disconnect notification itself. This function
816 * will be called with this peer's HELLO message to initiate
817 * a fresh connection to another peer.
820 * @param session which session must be used
821 * @param msgbuf the message to transmit
822 * @param msgbuf_size number of bytes in 'msgbuf'
823 * @param priority how important is the message (most plugins will
824 * ignore message priority and just FIFO)
825 * @param to how long to wait at most for the transmission (does not
826 * require plugins to discard the message after the timeout,
827 * just advisory for the desired delay; most plugins will ignore
829 * @param cont continuation to call once the message has
830 * been transmitted (or if the transport is ready
831 * for the next transmission call; or if the
832 * peer disconnected...); can be NULL
833 * @param cont_cls closure for cont
834 * @return number of bytes used (on the physical network, with overheads);
835 * -1 on hard errors (i.e. address invalid); 0 is a legal value
836 * and does NOT mean that the message was not transmitted (DV)
839 udp_plugin_send (void *cls,
841 const char *msgbuf, size_t msgbuf_size,
842 unsigned int priority,
843 struct GNUNET_TIME_Relative to,
844 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
846 struct Plugin *plugin = cls;
847 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
849 struct UDPMessageWrapper * udpw;
850 struct UDPMessage *udp;
852 GNUNET_assert (plugin != NULL);
853 GNUNET_assert (s != NULL);
855 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
858 return GNUNET_SYSERR;
861 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessions, &s->target.hashPubKey, s))
864 return GNUNET_SYSERR;
867 LOG (GNUNET_ERROR_TYPE_DEBUG,
868 "UDP transmits %u-byte message to `%s' using address `%s'\n",
870 GNUNET_i2s (&s->target),
871 GNUNET_a2s(s->sock_addr, s->addrlen));
874 udp = (struct UDPMessage *) mbuf;
875 udp->header.size = htons (mlen);
876 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
877 udp->reserved = htonl (0);
878 udp->sender = *plugin->env->my_identity;
882 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + mlen);
884 udpw->udp = (char *) &udpw[1];
885 udpw->msg_size = mlen;
886 udpw->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
888 udpw->cont_cls = cont_cls;
889 udpw->frag_ctx = NULL;
891 memcpy (udpw->udp, udp, sizeof (struct UDPMessage));
892 memcpy (&udpw->udp[sizeof (struct UDPMessage)], msgbuf, msgbuf_size);
894 GNUNET_CONTAINER_DLL_insert(plugin->msg_head, plugin->msg_tail, udpw);
898 LOG (GNUNET_ERROR_TYPE_DEBUG,
899 "UDP has to fragment message \n");
900 if (s->frag_ctx != NULL)
901 return GNUNET_SYSERR;
902 memcpy (&udp[1], msgbuf, msgbuf_size);
903 struct FragmentationContext * frag_ctx = GNUNET_malloc(sizeof (struct FragmentationContext));
905 frag_ctx->plugin = plugin;
906 frag_ctx->session = s;
907 frag_ctx->cont = cont;
908 frag_ctx->cont_cls = cont_cls;
909 frag_ctx->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
910 frag_ctx->bytes_to_send = mlen;
911 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
914 plugin->last_expected_delay,
919 s->frag_ctx = frag_ctx;
925 static ssize_t udp_plugin_send_wrapper (void *cls,
927 GNUNET_PeerIdentity *
935 struct Session * session,
939 GNUNET_TRANSPORT_TransmitContinuation
940 cont, void *cont_cls)
943 struct Session * s = NULL;
944 struct GNUNET_HELLO_Address * ha = NULL;
946 ha = GNUNET_HELLO_address_allocate(target, "", addr,addrlen);
947 GNUNET_assert (ha != NULL);
948 s = udp_plugin_get_session(cls, ha);
949 GNUNET_assert (s != NULL);
951 ret = udp_plugin_send (cls, s, msgbuf, msgbuf_size, priority, timeout, cont, cont_cls);
958 * Our external IP address/port mapping has changed.
960 * @param cls closure, the 'struct LocalAddrList'
961 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
962 * the previous (now invalid) one
963 * @param addr either the previous or the new public IP address
964 * @param addrlen actual lenght of the address
967 udp_nat_port_map_callback (void *cls, int add_remove,
968 const struct sockaddr *addr, socklen_t addrlen)
970 struct Plugin *plugin = cls;
971 struct IPv4UdpAddress u4;
972 struct IPv6UdpAddress u6;
976 /* convert 'addr' to our internal format */
977 switch (addr->sa_family)
980 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
981 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
982 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
987 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
988 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
989 sizeof (struct in6_addr));
990 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
998 /* modify our published address list */
999 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1005 * Message tokenizer has broken up an incomming message. Pass it on
1008 * @param cls the 'struct Plugin'
1009 * @param client the 'struct SourceInformation'
1010 * @param hdr the actual message
1013 process_inbound_tokenized_messages (void *cls, void *client,
1014 const struct GNUNET_MessageHeader *hdr)
1016 struct Plugin *plugin = cls;
1017 struct SourceInformation *si = client;
1018 struct GNUNET_ATS_Information ats[2];
1019 struct GNUNET_TIME_Relative delay;
1021 GNUNET_assert (si->session != NULL);
1023 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1024 ats[0].value = htonl (1);
1025 ats[1] = si->session->ats;
1026 GNUNET_break (ntohl(ats[1].value) != GNUNET_ATS_NET_UNSPECIFIED);
1028 delay = plugin->env->receive (plugin->env->cls,
1031 (const struct GNUNET_ATS_Information *) &ats, 2,
1035 si->session->flow_delay_for_other_peer = delay;
1040 * We've received a UDP Message. Process it (pass contents to main service).
1042 * @param plugin plugin context
1043 * @param msg the message
1044 * @param sender_addr sender address
1045 * @param sender_addr_len number of bytes in sender_addr
1048 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
1049 const struct sockaddr *sender_addr,
1050 socklen_t sender_addr_len)
1052 struct SourceInformation si;
1053 struct Session * s = NULL;
1054 struct IPv4UdpAddress u4;
1055 struct IPv6UdpAddress u6;
1056 struct GNUNET_ATS_Information ats;
1060 if (0 != ntohl (msg->reserved))
1062 GNUNET_break_op (0);
1065 if (ntohs (msg->header.size) <
1066 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
1068 GNUNET_break_op (0);
1072 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
1073 ats.value = htonl (GNUNET_ATS_NET_UNSPECIFIED);
1074 /* convert address */
1075 switch (sender_addr->sa_family)
1078 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
1079 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
1080 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1085 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
1086 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
1087 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
1096 LOG (GNUNET_ERROR_TYPE_DEBUG,
1097 "Received message with %u bytes from peer `%s' at `%s'\n",
1098 (unsigned int) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1099 GNUNET_a2s (sender_addr, sender_addr_len));
1102 struct GNUNET_HELLO_Address * address = GNUNET_HELLO_address_allocate(&msg->sender, "udp", arg, args);
1103 s = udp_plugin_get_session(plugin, address);
1104 GNUNET_free (address);
1106 /* iterate over all embedded messages */
1108 si.sender = msg->sender;
1112 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1113 ntohs (msg->header.size) -
1114 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1119 * Scan the heap for a receive context with the given address.
1121 * @param cls the 'struct FindReceiveContext'
1122 * @param node internal node of the heap
1123 * @param element value stored at the node (a 'struct ReceiveContext')
1124 * @param cost cost associated with the node
1125 * @return GNUNET_YES if we should continue to iterate,
1129 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1130 void *element, GNUNET_CONTAINER_HeapCostType cost)
1132 struct FindReceiveContext *frc = cls;
1133 struct DefragContext *e = element;
1135 if ((frc->addr_len == e->addr_len) &&
1136 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1146 * Process a defragmented message.
1148 * @param cls the 'struct ReceiveContext'
1149 * @param msg the message
1152 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1154 struct DefragContext *rc = cls;
1156 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1161 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1166 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1167 rc->src_addr, rc->addr_len);
1170 struct LookupContext
1172 const struct sockaddr * addr;
1175 struct Session *res;
1179 lookup_session_by_addr_it (void *cls, const GNUNET_HashCode * key, void *value)
1181 struct LookupContext *l_ctx = cls;
1182 struct Session * s = value;
1184 if ((s->addrlen == l_ctx->addrlen) &&
1185 (0 == memcmp (s->sock_addr, l_ctx->addr, s->addrlen)))
1194 * Transmit an acknowledgement.
1196 * @param cls the 'struct ReceiveContext'
1197 * @param id message ID (unused)
1198 * @param msg ack to transmit
1201 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1203 struct DefragContext *rc = cls;
1205 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1206 struct UDP_ACK_Message *udp_ack;
1208 struct UDPMessageWrapper *udpw;
1211 struct LookupContext l_ctx;
1212 l_ctx.addr = rc->src_addr;
1213 l_ctx.addrlen = rc->addr_len;
1215 GNUNET_CONTAINER_multihashmap_iterate (rc->plugin->sessions,
1216 &lookup_session_by_addr_it,
1220 GNUNET_assert (s != NULL);
1222 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1223 delay = s->flow_delay_for_other_peer.rel_value;
1226 LOG (GNUNET_ERROR_TYPE_DEBUG,
1227 "Sending ACK to `%s' including delay of %u ms\n",
1228 GNUNET_a2s (rc->src_addr,
1229 (rc->src_addr->sa_family ==
1230 AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct
1234 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msize);
1236 udpw->cont_cls = NULL;
1237 udpw->frag_ctx = NULL;
1238 udpw->msg_size = msize;
1240 udpw->timeout = GNUNET_TIME_absolute_get_forever();
1241 udpw->udp = (char *)&udpw[1];
1243 udp_ack = (struct UDP_ACK_Message *) udpw->udp;
1244 udp_ack->header.size = htons ((uint16_t) msize);
1245 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1246 udp_ack->delay = htonl (delay);
1247 udp_ack->sender = *rc->plugin->env->my_identity;
1248 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1250 GNUNET_CONTAINER_DLL_insert(rc->plugin->msg_head, rc->plugin->msg_tail, udpw);
1254 static void read_process_msg (struct Plugin *plugin,
1255 const struct GNUNET_MessageHeader *msg,
1259 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1261 GNUNET_break_op (0);
1264 process_udp_message (plugin, (const struct UDPMessage *) msg,
1265 (const struct sockaddr *) addr, fromlen);
1269 static void read_process_ack (struct Plugin *plugin,
1270 const struct GNUNET_MessageHeader *msg,
1274 const struct GNUNET_MessageHeader *ack;
1275 const struct UDP_ACK_Message *udp_ack;
1276 struct LookupContext l_ctx;
1277 struct Session *s = NULL;
1278 struct GNUNET_TIME_Relative flow_delay;
1280 if (ntohs (msg->size) <
1281 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1283 GNUNET_break_op (0);
1287 udp_ack = (const struct UDP_ACK_Message *) msg;
1289 l_ctx.addr = (const struct sockaddr *) addr;
1290 l_ctx.addrlen = fromlen;
1292 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions,
1293 &lookup_session_by_addr_it,
1297 if ((s == NULL) || (s->frag_ctx == NULL))
1300 flow_delay.rel_value = (uint64_t) ntohl (udp_ack->delay);
1301 LOG (GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %llu\n",
1302 flow_delay.rel_value);
1303 s->flow_delay_from_other_peer =
1304 GNUNET_TIME_relative_to_absolute (flow_delay);
1306 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1307 if (ntohs (ack->size) !=
1308 ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1310 GNUNET_break_op (0);
1314 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack))
1317 LOG (GNUNET_ERROR_TYPE_DEBUG,
1318 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1319 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1320 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1326 LOG (GNUNET_ERROR_TYPE_DEBUG,
1327 "FULL MESSAGE ACKed\n",
1328 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1329 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1331 plugin->last_expected_delay = GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag);
1333 struct UDPMessageWrapper * udpw = plugin->msg_head;
1336 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1338 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
1344 if (s->frag_ctx->cont != NULL)
1346 (s->frag_ctx->cont_cls, &udp_ack->sender, GNUNET_OK);
1347 GNUNET_free (s->frag_ctx);
1352 static void read_process_fragment (struct Plugin *plugin,
1353 const struct GNUNET_MessageHeader *msg,
1357 struct DefragContext *d_ctx;
1358 struct GNUNET_TIME_Absolute now;
1359 struct FindReceiveContext frc;
1363 frc.addr = (const struct sockaddr *) addr;
1364 frc.addr_len = fromlen;
1367 LOG (GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
1368 (unsigned int) ntohs (msg->size),
1369 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1372 /* Lookup existing receive context for this address */
1373 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1374 &find_receive_context,
1376 now = GNUNET_TIME_absolute_get ();
1381 /* Create a new defragmentation context */
1382 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + fromlen);
1383 memcpy (&d_ctx[1], addr, fromlen);
1384 d_ctx->src_addr = (const struct sockaddr *) &d_ctx[1];
1385 d_ctx->addr_len = fromlen;
1386 d_ctx->plugin = plugin;
1388 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1389 UDP_MAX_MESSAGES_IN_DEFRAG, d_ctx,
1390 &fragment_msg_proc, &ack_proc);
1392 GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, d_ctx,
1393 (GNUNET_CONTAINER_HeapCostType)
1396 LOG (GNUNET_ERROR_TYPE_DEBUG, "Created new defragmentation context for %u-byte fragment from `%s'\n",
1397 (unsigned int) ntohs (msg->size),
1398 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1404 LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing defragmentation context for %u-byte fragment from `%s'\n",
1405 (unsigned int) ntohs (msg->size),
1406 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1410 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
1412 /* keep this 'rc' from expiring */
1413 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs, d_ctx->hnode,
1414 (GNUNET_CONTAINER_HeapCostType)
1417 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
1418 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1420 /* remove 'rc' that was inactive the longest */
1421 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
1422 GNUNET_assert (NULL != d_ctx);
1423 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1424 GNUNET_free (d_ctx);
1429 * Read and process a message from the given socket.
1431 * @param plugin the overall plugin
1432 * @param rsock socket to read from
1435 udp_select_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1441 const struct GNUNET_MessageHeader *msg;
1443 fromlen = sizeof (addr);
1444 memset (&addr, 0, sizeof (addr));
1445 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1446 (struct sockaddr *) &addr, &fromlen);
1448 if (size < sizeof (struct GNUNET_MessageHeader))
1450 GNUNET_break_op (0);
1453 msg = (const struct GNUNET_MessageHeader *) buf;
1455 LOG (GNUNET_ERROR_TYPE_DEBUG,
1456 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) size,
1457 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs (msg->type));
1459 if (size != ntohs (msg->size))
1461 GNUNET_break_op (0);
1465 switch (ntohs (msg->type))
1467 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
1468 udp_broadcast_receive (plugin, &buf, size, addr, fromlen);
1471 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1472 read_process_msg (plugin, msg, addr, fromlen);
1475 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1476 read_process_ack (plugin, msg, addr, fromlen);;
1479 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1480 read_process_fragment (plugin, msg, addr, fromlen);
1484 GNUNET_break_op (0);
1490 udp_select_send (struct Plugin *plugin)
1494 struct GNUNET_TIME_Absolute max;
1495 struct GNUNET_TIME_Absolute ;
1497 struct UDPMessageWrapper *udpw = plugin->msg_head;
1498 const struct sockaddr * sa = udpw->session->sock_addr;
1500 max = GNUNET_TIME_absolute_max(udpw->timeout, GNUNET_TIME_absolute_get());
1502 while (udpw != NULL)
1504 if (max.abs_value != udpw->timeout.abs_value)
1506 /* Message timed out */
1508 if (udpw->cont != NULL)
1509 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1510 if (udpw->frag_ctx != NULL)
1513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Fragmented message for peer `%s' with size %u timed out\n",
1514 GNUNET_i2s(&udpw->session->target), udpw->frag_ctx->bytes_to_send);
1516 GNUNET_FRAGMENT_context_destroy(udpw->frag_ctx->frag);
1521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' with size %u timed out\n",
1522 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1526 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
1528 udpw = plugin->msg_head;
1532 struct GNUNET_TIME_Relative delta = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
1533 if (delta.rel_value == 0)
1535 /* this message is not delayed */
1536 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Message is not delayed for %llu \n",
1542 /* this message is delayed, try next */
1543 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Message is delayed for %llu \n",
1553 /* No message left */
1557 switch (sa->sa_family)
1560 if (NULL == plugin->sockv4)
1563 GNUNET_NETWORK_socket_sendto (plugin->sockv4, udpw->udp, udpw->msg_size,
1564 sa, slen = sizeof (struct sockaddr_in));
1567 if (NULL == plugin->sockv6)
1570 GNUNET_NETWORK_socket_sendto (plugin->sockv6, udpw->udp, udpw->msg_size,
1571 sa, slen = sizeof (struct sockaddr_in6));
1577 if (GNUNET_SYSERR == sent)
1579 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
1580 LOG (GNUNET_ERROR_TYPE_DEBUG,
1581 "UDP transmitted %u-byte message to %s (%d: %s)\n",
1582 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1583 (sent < 0) ? STRERROR (errno) : "ok");
1584 if (udpw->cont != NULL)
1585 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1587 LOG (GNUNET_ERROR_TYPE_DEBUG,
1588 "UDP transmitted %u-byte message to %s (%d: %s)\n",
1589 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1590 (sent < 0) ? STRERROR (errno) : "ok");
1592 /* This was just a message fragment */
1593 if (udpw->frag_ctx != NULL)
1595 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1597 /* This was a complete message*/
1600 if (udpw->cont != NULL)
1601 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_OK);
1604 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
1611 * We have been notified that our readset has something to read. We don't
1612 * know which socket needs to be read, so we have to check each one
1613 * Then reschedule this function to be called again once more is available.
1615 * @param cls the plugin handle
1616 * @param tc the scheduling context (for rescheduling this function again)
1619 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1621 struct Plugin *plugin = cls;
1623 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1624 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1627 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1629 if ((NULL != plugin->sockv4) &&
1630 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1631 udp_select_read (plugin, plugin->sockv4);
1632 if ((NULL != plugin->sockv6) &&
1633 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1634 udp_select_read (plugin, plugin->sockv6);
1637 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1639 if (plugin->msg_head != NULL)
1640 udp_select_send (plugin);
1643 plugin->select_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1644 GNUNET_SCHEDULER_NO_TASK,
1645 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1646 plugin->ws, &udp_plugin_select, plugin);
1652 setup_sockets (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
1655 int sockets_created = 0;
1656 struct sockaddr *serverAddr;
1657 struct sockaddr *addrs[2];
1658 socklen_t addrlens[2];
1661 /* Create IPv6 socket */
1662 if (plugin->enable_ipv6 == GNUNET_YES)
1664 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1665 if (NULL == plugin->sockv6)
1667 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1671 #if HAVE_SOCKADDR_IN_SIN_LEN
1672 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1674 serverAddrv6->sin6_family = AF_INET6;
1675 serverAddrv6->sin6_addr = in6addr_any;
1676 serverAddrv6->sin6_port = htons (plugin->port);
1677 addrlen = sizeof (struct sockaddr_in6);
1678 serverAddr = (struct sockaddr *) serverAddrv6;
1680 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1681 ntohs (serverAddrv6->sin6_port));
1684 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1687 serverAddrv6->sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1689 LOG (GNUNET_ERROR_TYPE_DEBUG,
1690 "IPv6 Binding failed, trying new port %d\n",
1691 ntohs (serverAddrv6->sin6_port));
1696 GNUNET_NETWORK_socket_close (plugin->sockv6);
1697 plugin->sockv6 = NULL;
1701 if (plugin->sockv6 != NULL)
1704 LOG (GNUNET_ERROR_TYPE_DEBUG,
1705 "IPv6 socket created on port %d\n",
1706 ntohs (serverAddrv6->sin6_port));
1708 addrs[sockets_created] = (struct sockaddr *) serverAddrv6;
1709 addrlens[sockets_created] = sizeof (struct sockaddr_in6);
1715 /* Create IPv4 socket */
1716 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1717 if (NULL == plugin->sockv4)
1719 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1723 #if HAVE_SOCKADDR_IN_SIN_LEN
1724 serverAddrv4.sin_len = sizeof (serverAddrv4);
1726 serverAddrv4->sin_family = AF_INET;
1727 serverAddrv4->sin_addr.s_addr = INADDR_ANY;
1728 serverAddrv4->sin_port = htons (plugin->port);
1729 addrlen = sizeof (struct sockaddr_in);
1730 serverAddr = (struct sockaddr *) serverAddrv4;
1733 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1734 ntohs (serverAddrv4->sin_port));
1737 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1740 serverAddrv4->sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1742 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
1743 ntohs (serverAddrv4->sin_port));
1748 GNUNET_NETWORK_socket_close (plugin->sockv4);
1749 plugin->sockv4 = NULL;
1753 if (plugin->sockv4 != NULL)
1755 addrs[sockets_created] = (struct sockaddr *) serverAddrv4;
1756 addrlens[sockets_created] = sizeof (struct sockaddr_in);
1761 /* Create file descriptors */
1762 plugin->rs = GNUNET_NETWORK_fdset_create ();
1763 plugin->ws = GNUNET_NETWORK_fdset_create ();
1764 GNUNET_NETWORK_fdset_zero (plugin->rs);
1765 GNUNET_NETWORK_fdset_zero (plugin->ws);
1766 if (NULL != plugin->sockv4)
1768 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv4);
1769 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->sockv4);
1771 if (NULL != plugin->sockv6)
1773 GNUNET_NETWORK_fdset_set (plugin->rs, plugin->sockv6);
1774 GNUNET_NETWORK_fdset_set (plugin->ws, plugin->sockv6);
1777 if (sockets_created == 0)
1778 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
1780 plugin->select_task =
1781 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1782 GNUNET_SCHEDULER_NO_TASK,
1783 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1784 plugin->ws, &udp_plugin_select, plugin);
1786 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
1787 GNUNET_NO, plugin->port,
1789 (const struct sockaddr **) addrs, addrlens,
1790 &udp_nat_port_map_callback, NULL, plugin);
1792 return sockets_created;
1797 * The exported method. Makes the core api available via a global and
1798 * returns the udp transport API.
1800 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
1801 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
1804 libgnunet_plugin_transport_udp_init (void *cls)
1806 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1807 struct GNUNET_TRANSPORT_PluginFunctions *api;
1808 struct Plugin *plugin;
1810 unsigned long long port;
1811 unsigned long long aport;
1812 unsigned long long broadcast;
1813 unsigned long long udp_max_bps;
1814 unsigned long long enable_v6;
1815 char * bind4_address;
1816 char * bind6_address;
1817 struct GNUNET_TIME_Relative interval;
1819 struct sockaddr_in serverAddrv4;
1820 struct sockaddr_in6 serverAddrv6;
1824 /* Get port number */
1826 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
1830 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1831 "ADVERTISED_PORT", &aport))
1835 LOG (GNUNET_ERROR_TYPE_WARNING,
1836 _("Given `%s' option is out of range: %llu > %u\n"), "PORT", port,
1843 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat",
1846 enable_v6 = GNUNET_NO;
1849 enable_v6 = GNUNET_YES;
1853 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1854 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1857 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1858 "BINDTO", &bind4_address))
1860 LOG (GNUNET_ERROR_TYPE_DEBUG,
1861 "Binding udp plugin to specific address: `%s'\n",
1863 if (1 != inet_pton (AF_INET, bind4_address, &serverAddrv4.sin_addr))
1865 GNUNET_free (bind4_address);
1871 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
1872 "BINDTO6", &bind6_address))
1874 LOG (GNUNET_ERROR_TYPE_DEBUG,
1875 "Binding udp plugin to specific address: `%s'\n",
1878 inet_pton (AF_INET6, bind6_address, &serverAddrv6.sin6_addr))
1880 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
1882 GNUNET_free_non_null (bind4_address);
1883 GNUNET_free (bind6_address);
1889 /* Enable neighbour discovery */
1890 broadcast = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp",
1892 if (broadcast == GNUNET_SYSERR)
1893 broadcast = GNUNET_NO;
1895 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-udp",
1896 "BROADCAST_INTERVAL", &interval))
1898 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
1901 /* Maximum datarate */
1902 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
1903 "MAX_BPS", &udp_max_bps))
1905 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
1908 plugin = GNUNET_malloc (sizeof (struct Plugin));
1909 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1911 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
1912 GNUNET_BANDWIDTH_value_init ((uint32_t)udp_max_bps), 30);
1915 plugin->sessions = GNUNET_CONTAINER_multihashmap_create (10);
1916 plugin->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1917 plugin->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
1918 plugin->port = port;
1919 plugin->aport = aport;
1920 plugin->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
1921 plugin->broadcast_interval = interval;
1922 plugin->enable_ipv6 = enable_v6;
1927 api->disconnect = &udp_disconnect;
1928 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1929 api->address_to_string = &udp_address_to_string;
1930 api->check_address = &udp_plugin_check_address;
1931 api->get_session = &udp_plugin_get_session;
1932 api->send = &udp_plugin_send_wrapper;
1933 api->send_with_session = &udp_plugin_send;
1935 LOG (GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
1936 res = setup_sockets (plugin, &serverAddrv6, &serverAddrv4);
1937 if ((res == 0) || ((plugin->sockv4 == NULL) && (plugin->sockv6 == NULL)))
1939 LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to create network sockets, plugin failed\n");
1940 GNUNET_free (plugin);
1945 LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting broadcasting\n");
1946 if (broadcast == GNUNET_YES)
1947 setup_broadcast (plugin, &serverAddrv6, &serverAddrv4);
1950 GNUNET_free_non_null (bind4_address);
1951 GNUNET_free_non_null (bind6_address);
1955 int heap_cleanup_iterator (void *cls,
1956 struct GNUNET_CONTAINER_HeapNode *
1957 node, void *element,
1958 GNUNET_CONTAINER_HeapCostType
1961 struct DefragContext * d_ctx = element;
1963 GNUNET_CONTAINER_heap_remove_node (node);
1964 GNUNET_DEFRAGMENT_context_destroy(d_ctx->defrag);
1965 GNUNET_free (d_ctx);
1972 * The exported method. Makes the core api available via a global and
1973 * returns the udp transport API.
1975 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
1976 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
1979 libgnunet_plugin_transport_udp_done (void *cls)
1981 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1982 struct Plugin *plugin = api->cls;
1983 stop_broadcast (plugin);
1985 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1987 GNUNET_SCHEDULER_cancel (plugin->select_task);
1988 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1991 /* Closing sockets */
1992 if (plugin->sockv4 != NULL)
1994 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
1995 plugin->sockv4 = NULL;
1997 if (plugin->sockv6 != NULL)
1999 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
2000 plugin->sockv6 = NULL;
2002 GNUNET_NETWORK_fdset_destroy (plugin->rs);
2003 GNUNET_NETWORK_fdset_destroy (plugin->ws);
2004 GNUNET_NAT_unregister (plugin->nat);
2006 if (plugin->defrag_ctxs != NULL)
2008 GNUNET_CONTAINER_heap_iterate(plugin->defrag_ctxs,
2009 heap_cleanup_iterator, NULL);
2010 GNUNET_CONTAINER_heap_destroy(plugin->defrag_ctxs);
2011 plugin->defrag_ctxs = NULL;
2013 if (plugin->mst != NULL)
2015 GNUNET_SERVER_mst_destroy(plugin->mst);
2019 /* Clean up leftover messages */
2020 struct UDPMessageWrapper *udpw = plugin->msg_head;
2021 while (udpw != NULL)
2023 struct UDPMessageWrapper *tmp = udpw->next;
2024 GNUNET_CONTAINER_DLL_remove(plugin->msg_head, plugin->msg_tail, udpw);
2025 if (udpw->cont != NULL)
2026 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2031 /* Clean up sessions */
2033 LOG (GNUNET_ERROR_TYPE_DEBUG,
2034 "Cleaning up sessions\n");
2036 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &disconnect_and_free_it, plugin);
2037 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
2040 GNUNET_free (plugin);
2046 /* end of plugin_transport_udp.c */