2 This file is part of GNUnet
3 (C) 2010, 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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 * Function called to convert a string address to
370 * @param cls closure ('struct Plugin*')
371 * @param addr string address
372 * @param addrlen length of the address
373 * @param buf location to store the buffer
374 * @param added location to store the number of bytes in the buffer.
375 * If the function returns GNUNET_SYSERR, its contents are undefined.
376 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
379 udp_string_to_address (void *cls, const char *addr, uint16_t addrlen,
380 void **buf, size_t *added)
382 struct sockaddr_storage socket_address;
383 int ret = GNUNET_STRINGS_to_address_ip (addr, addrlen,
386 if (ret != GNUNET_OK)
387 return GNUNET_SYSERR;
389 if (socket_address.ss_family == AF_INET)
391 struct IPv4UdpAddress *u4;
392 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
393 u4 = GNUNET_malloc (sizeof (struct IPv4UdpAddress));
394 u4->ipv4_addr = in4->sin_addr.s_addr;
395 u4->u4_port = in4->sin_port;
397 *added = sizeof (struct IPv4UdpAddress);
399 else if (socket_address.ss_family == AF_INET6)
401 struct IPv6UdpAddress *u6;
402 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
403 u6 = GNUNET_malloc (sizeof (struct IPv6UdpAddress));
404 u6->ipv6_addr = in6->sin6_addr;
405 u6->u6_port = in6->sin6_port;
407 *added = sizeof (struct IPv6UdpAddress);
409 return GNUNET_SYSERR;
414 * Append our port and forward the result.
416 * @param cls a 'struct PrettyPrinterContext'
417 * @param hostname result from DNS resolver
420 append_port (void *cls, const char *hostname)
422 struct PrettyPrinterContext *ppc = cls;
425 if (hostname == NULL)
427 ppc->asc (ppc->asc_cls, NULL);
431 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
432 ppc->asc (ppc->asc_cls, ret);
438 * Convert the transports address to a nice, human-readable
442 * @param type name of the transport that generated the address
443 * @param addr one of the addresses of the host, NULL for the last address
444 * the specific address format depends on the transport
445 * @param addrlen length of the address
446 * @param numeric should (IP) addresses be displayed in numeric form?
447 * @param timeout after how long should we give up?
448 * @param asc function to call on each string
449 * @param asc_cls closure for asc
452 udp_plugin_address_pretty_printer (void *cls, const char *type,
453 const void *addr, size_t addrlen,
455 struct GNUNET_TIME_Relative timeout,
456 GNUNET_TRANSPORT_AddressStringCallback asc,
459 struct PrettyPrinterContext *ppc;
462 struct sockaddr_in a4;
463 struct sockaddr_in6 a6;
464 const struct IPv4UdpAddress *u4;
465 const struct IPv6UdpAddress *u6;
468 if (addrlen == sizeof (struct IPv6UdpAddress))
471 memset (&a6, 0, sizeof (a6));
472 a6.sin6_family = AF_INET6;
473 #if HAVE_SOCKADDR_IN_SIN_LEN
474 a6.sin6_len = sizeof (a6);
476 a6.sin6_port = u6->u6_port;
477 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
478 port = ntohs (u6->u6_port);
482 else if (addrlen == sizeof (struct IPv4UdpAddress))
485 memset (&a4, 0, sizeof (a4));
486 a4.sin_family = AF_INET;
487 #if HAVE_SOCKADDR_IN_SIN_LEN
488 a4.sin_len = sizeof (a4);
490 a4.sin_port = u4->u4_port;
491 a4.sin_addr.s_addr = u4->ipv4_addr;
492 port = ntohs (u4->u4_port);
498 /* invalid address */
503 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
505 ppc->asc_cls = asc_cls;
507 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
512 * Check if the given port is plausible (must be either our listen
513 * port or our advertised port). If it is neither, we return
516 * @param plugin global variables
517 * @param in_port port number to check
518 * @return GNUNET_OK if port is either open_port or adv_port
521 check_port (struct Plugin *plugin, uint16_t in_port)
523 if ((in_port == plugin->port) || (in_port == plugin->aport))
525 return GNUNET_SYSERR;
531 * Function that will be called to check if a binary address for this
532 * plugin is well-formed and corresponds to an address for THIS peer
533 * (as per our configuration). Naturally, if absolutely necessary,
534 * plugins can be a bit conservative in their answer, but in general
535 * plugins should make sure that the address does not redirect
536 * traffic to a 3rd party that might try to man-in-the-middle our
539 * @param cls closure, should be our handle to the Plugin
540 * @param addr pointer to the address
541 * @param addrlen length of addr
542 * @return GNUNET_OK if this is a plausible address for this peer
543 * and transport, GNUNET_SYSERR if not
547 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
549 struct Plugin *plugin = cls;
550 struct IPv4UdpAddress *v4;
551 struct IPv6UdpAddress *v6;
553 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
554 (addrlen != sizeof (struct IPv6UdpAddress)))
557 return GNUNET_SYSERR;
559 if (addrlen == sizeof (struct IPv4UdpAddress))
561 v4 = (struct IPv4UdpAddress *) addr;
562 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
563 return GNUNET_SYSERR;
565 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
566 sizeof (struct in_addr)))
567 return GNUNET_SYSERR;
571 v6 = (struct IPv6UdpAddress *) addr;
572 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
575 return GNUNET_SYSERR;
577 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
578 return GNUNET_SYSERR;
580 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
581 sizeof (struct in6_addr)))
582 return GNUNET_SYSERR;
589 * Destroy a session, plugin is being unloaded.
592 * @param key hash of public key of target peer
593 * @param value a 'struct PeerSession*' to clean up
594 * @return GNUNET_OK (continue to iterate)
597 disconnect_and_free_it (void *cls, const GNUNET_HashCode * key, void *value)
599 struct Plugin *plugin = cls;
600 struct Session *s = value;
601 struct UDPMessageWrapper *udpw;
602 struct UDPMessageWrapper *next;
605 LOG (GNUNET_ERROR_TYPE_DEBUG,
606 "Session %p to peer `%s' address ended \n",
608 GNUNET_i2s (&s->target),
609 GNUNET_a2s (s->sock_addr, s->addrlen));
612 if (s->frag_ctx != NULL)
614 GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag);
615 GNUNET_free (s->frag_ctx);
619 udpw = plugin->ipv4_queue_head;
623 if (udpw->session == s)
625 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
627 if (udpw->cont != NULL)
628 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
634 udpw = plugin->ipv6_queue_head;
638 if (udpw->session == s)
640 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
642 if (udpw->cont != NULL)
643 udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
649 plugin->env->session_end (plugin->env->cls, &s->target, s);
651 GNUNET_assert (GNUNET_YES ==
652 GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
653 &s->target.hashPubKey,
663 * Disconnect from a remote node. Clean up session if we have one for this peer
665 * @param cls closure for this call (should be handle to Plugin)
666 * @param target the peeridentity of the peer to disconnect
667 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
670 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
672 struct Plugin *plugin = cls;
673 GNUNET_assert (plugin != NULL);
675 GNUNET_assert (target != NULL);
677 LOG (GNUNET_ERROR_TYPE_DEBUG,
678 "Disconnecting from peer `%s'\n", GNUNET_i2s (target));
680 /* Clean up sessions */
681 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin);
684 static struct Session *
685 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
686 const void *addr, size_t addrlen,
687 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
690 const struct IPv4UdpAddress *t4;
691 const struct IPv6UdpAddress *t6;
692 struct sockaddr_in *v4;
693 struct sockaddr_in6 *v6;
698 case sizeof (struct IPv4UdpAddress):
699 if (NULL == plugin->sockv4)
704 s = GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in));
705 len = sizeof (struct sockaddr_in);
706 v4 = (struct sockaddr_in *) &s[1];
707 v4->sin_family = AF_INET;
708 #if HAVE_SOCKADDR_IN_SIN_LEN
709 v4->sin_len = sizeof (struct sockaddr_in);
711 v4->sin_port = t4->u4_port;
712 v4->sin_addr.s_addr = t4->ipv4_addr;
713 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v4, sizeof (struct sockaddr_in));
715 case sizeof (struct IPv6UdpAddress):
716 if (NULL == plugin->sockv6)
722 GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6));
723 len = sizeof (struct sockaddr_in6);
724 v6 = (struct sockaddr_in6 *) &s[1];
725 v6->sin6_family = AF_INET6;
726 #if HAVE_SOCKADDR_IN_SIN_LEN
727 v6->sin6_len = sizeof (struct sockaddr_in6);
729 v6->sin6_port = t6->u6_port;
730 v6->sin6_addr = t6->ipv6_addr;
731 s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v6, sizeof (struct sockaddr_in6));
734 /* Must have a valid address to send to */
741 s->sock_addr = (const struct sockaddr *) &s[1];
742 s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero();
743 s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero();
744 s->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
749 static int session_cmp_it (void *cls,
750 const GNUNET_HashCode * key,
753 struct SessionCompareContext * cctx = cls;
754 const struct GNUNET_HELLO_Address *address = cctx->addr;
755 struct Session *s = value;
757 socklen_t s_addrlen = s->addrlen;
760 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing address %s <-> %s\n",
761 udp_address_to_string (NULL, (void *) address->address, address->address_length),
762 GNUNET_a2s (s->sock_addr, s->addrlen));
765 if ((address->address_length == sizeof (struct IPv4UdpAddress)) &&
766 (s_addrlen == sizeof (struct sockaddr_in)))
768 struct IPv4UdpAddress * u4 = NULL;
769 u4 = (struct IPv4UdpAddress *) address->address;
770 const struct sockaddr_in *s4 = (const struct sockaddr_in *) s->sock_addr;
771 if ((0 == memcmp ((const void *) &u4->ipv4_addr,(const void *) &s4->sin_addr, sizeof (struct in_addr))) &&
772 (u4->u4_port == s4->sin_port))
779 if ((address->address_length == sizeof (struct IPv6UdpAddress)) &&
780 (s_addrlen == sizeof (struct sockaddr_in6)))
782 struct IPv6UdpAddress * u6 = NULL;
783 u6 = (struct IPv6UdpAddress *) address->address;
784 const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) s->sock_addr;
785 if ((0 == memcmp (&u6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr))) &&
786 (u6->u6_port == s6->sin6_port))
799 * Creates a new outbound session the transport service will use to send data to the
802 * @param cls the plugin
803 * @param address the address
804 * @return the session or NULL of max connections exceeded
806 static struct Session *
807 udp_plugin_get_session (void *cls,
808 const struct GNUNET_HELLO_Address *address)
810 struct Session * s = NULL;
811 struct Plugin * plugin = cls;
812 struct IPv6UdpAddress * udp_a6;
813 struct IPv4UdpAddress * udp_a4;
815 GNUNET_assert (plugin != NULL);
816 GNUNET_assert (address != NULL);
819 if ((address->address == NULL) ||
820 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
821 (address->address_length != sizeof (struct IPv6UdpAddress))))
827 if (address->address_length == sizeof (struct IPv4UdpAddress))
829 if (plugin->sockv4 == NULL)
831 udp_a4 = (struct IPv4UdpAddress *) address->address;
832 if (udp_a4->u4_port == 0)
836 if (address->address_length == sizeof (struct IPv6UdpAddress))
838 if (plugin->sockv6 == NULL)
840 udp_a6 = (struct IPv6UdpAddress *) address->address;
841 if (udp_a6->u6_port == 0)
845 /* check if session already exists */
846 struct SessionCompareContext cctx;
850 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));
852 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx);
853 if (cctx.res != NULL)
856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res);
861 /* otherwise create new */
862 s = create_session (plugin,
865 address->address_length,
868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
869 "Creating new session %p for peer `%s' address `%s'\n",
871 GNUNET_i2s(&address->peer),
872 udp_address_to_string(NULL,address->address,address->address_length));
874 GNUNET_assert (GNUNET_OK ==
875 GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
876 &s->target.hashPubKey,
878 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
883 static void enqueue (struct Plugin *plugin, struct UDPMessageWrapper * udpw)
886 if (udpw->session->addrlen == sizeof (struct sockaddr_in))
887 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
888 if (udpw->session->addrlen == sizeof (struct sockaddr_in6))
889 GNUNET_CONTAINER_DLL_insert(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
893 * Function that is called with messages created by the fragmentation
894 * module. In the case of the 'proc' callback of the
895 * GNUNET_FRAGMENT_context_create function, this function must
896 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
898 * @param cls closure, the 'struct FragmentationContext'
899 * @param msg the message that was created
902 enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
904 struct FragmentationContext *frag_ctx = cls;
905 struct Plugin *plugin = frag_ctx->plugin;
906 struct UDPMessageWrapper * udpw;
909 size_t msg_len = ntohs (msg->size);
912 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper));
915 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msg_len);
916 udpw->session = frag_ctx->session;
918 udpw->udp = (char *) &udpw[1];
920 udpw->msg_size = msg_len;
921 udpw->cont = frag_ctx->cont;
922 udpw->cont_cls = frag_ctx->cont_cls;
923 udpw->timeout = frag_ctx->timeout;
924 udpw->frag_ctx = frag_ctx;
925 memcpy (udpw->udp, msg, msg_len);
927 enqueue (plugin, udpw);
930 if (s->addrlen == sizeof (struct sockaddr_in))
932 if (plugin->with_v4_ws == GNUNET_NO)
934 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
935 GNUNET_SCHEDULER_cancel(plugin->select_task);
937 plugin->select_task =
938 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
939 GNUNET_TIME_UNIT_FOREVER_REL,
942 &udp_plugin_select, plugin);
943 plugin->with_v4_ws = GNUNET_YES;
947 else if (s->addrlen == sizeof (struct sockaddr_in6))
949 if (plugin->with_v6_ws == GNUNET_NO)
951 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
952 GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
954 plugin->select_task_v6 =
955 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
956 GNUNET_TIME_UNIT_FOREVER_REL,
959 &udp_plugin_select_v6, plugin);
960 plugin->with_v6_ws = GNUNET_YES;
970 * Function that can be used by the transport service to transmit
971 * a message using the plugin. Note that in the case of a
972 * peer disconnecting, the continuation MUST be called
973 * prior to the disconnect notification itself. This function
974 * will be called with this peer's HELLO message to initiate
975 * a fresh connection to another peer.
978 * @param s which session must be used
979 * @param msgbuf the message to transmit
980 * @param msgbuf_size number of bytes in 'msgbuf'
981 * @param priority how important is the message (most plugins will
982 * ignore message priority and just FIFO)
983 * @param to how long to wait at most for the transmission (does not
984 * require plugins to discard the message after the timeout,
985 * just advisory for the desired delay; most plugins will ignore
987 * @param cont continuation to call once the message has
988 * been transmitted (or if the transport is ready
989 * for the next transmission call; or if the
990 * peer disconnected...); can be NULL
991 * @param cont_cls closure for cont
992 * @return number of bytes used (on the physical network, with overheads);
993 * -1 on hard errors (i.e. address invalid); 0 is a legal value
994 * and does NOT mean that the message was not transmitted (DV)
997 udp_plugin_send (void *cls,
999 const char *msgbuf, size_t msgbuf_size,
1000 unsigned int priority,
1001 struct GNUNET_TIME_Relative to,
1002 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1004 struct Plugin *plugin = cls;
1005 size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
1007 struct UDPMessageWrapper * udpw;
1008 struct UDPMessage *udp;
1010 GNUNET_assert (plugin != NULL);
1011 GNUNET_assert (s != NULL);
1013 if ((s->addrlen == sizeof (struct sockaddr_in6)) && (plugin->sockv6 == NULL))
1014 return GNUNET_SYSERR;
1016 if ((s->addrlen == sizeof (struct sockaddr_in)) && (plugin->sockv4 == NULL))
1017 return GNUNET_SYSERR;
1020 if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1023 return GNUNET_SYSERR;
1026 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessions, &s->target.hashPubKey, s))
1029 return GNUNET_SYSERR;
1032 LOG (GNUNET_ERROR_TYPE_DEBUG,
1033 "UDP transmits %u-byte message to `%s' using address `%s'\n",
1035 GNUNET_i2s (&s->target),
1036 GNUNET_a2s(s->sock_addr, s->addrlen));
1039 udp = (struct UDPMessage *) mbuf;
1040 udp->header.size = htons (mlen);
1041 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
1042 udp->reserved = htonl (0);
1043 udp->sender = *plugin->env->my_identity;
1045 if (mlen <= UDP_MTU)
1047 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + mlen);
1049 udpw->udp = (char *) &udpw[1];
1050 udpw->msg_size = mlen;
1051 udpw->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
1053 udpw->cont_cls = cont_cls;
1054 udpw->frag_ctx = NULL;
1056 memcpy (udpw->udp, udp, sizeof (struct UDPMessage));
1057 memcpy (&udpw->udp[sizeof (struct UDPMessage)], msgbuf, msgbuf_size);
1059 enqueue (plugin, udpw);
1063 LOG (GNUNET_ERROR_TYPE_DEBUG,
1064 "UDP has to fragment message \n");
1065 if (s->frag_ctx != NULL)
1066 return GNUNET_SYSERR;
1067 memcpy (&udp[1], msgbuf, msgbuf_size);
1068 struct FragmentationContext * frag_ctx = GNUNET_malloc(sizeof (struct FragmentationContext));
1070 frag_ctx->plugin = plugin;
1071 frag_ctx->session = s;
1072 frag_ctx->cont = cont;
1073 frag_ctx->cont_cls = cont_cls;
1074 frag_ctx->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
1075 frag_ctx->bytes_to_send = mlen;
1076 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
1079 s->last_expected_delay,
1084 s->frag_ctx = frag_ctx;
1088 if (s->addrlen == sizeof (struct sockaddr_in))
1090 if (plugin->with_v4_ws == GNUNET_NO)
1092 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1093 GNUNET_SCHEDULER_cancel(plugin->select_task);
1095 plugin->select_task =
1096 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1097 GNUNET_TIME_UNIT_FOREVER_REL,
1100 &udp_plugin_select, plugin);
1101 plugin->with_v4_ws = GNUNET_YES;
1105 else if (s->addrlen == sizeof (struct sockaddr_in6))
1107 if (plugin->with_v6_ws == GNUNET_NO)
1109 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1110 GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
1112 plugin->select_task_v6 =
1113 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1114 GNUNET_TIME_UNIT_FOREVER_REL,
1117 &udp_plugin_select_v6, plugin);
1118 plugin->with_v6_ws = GNUNET_YES;
1127 * Our external IP address/port mapping has changed.
1129 * @param cls closure, the 'struct LocalAddrList'
1130 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
1131 * the previous (now invalid) one
1132 * @param addr either the previous or the new public IP address
1133 * @param addrlen actual lenght of the address
1136 udp_nat_port_map_callback (void *cls, int add_remove,
1137 const struct sockaddr *addr, socklen_t addrlen)
1139 struct Plugin *plugin = cls;
1140 struct IPv4UdpAddress u4;
1141 struct IPv6UdpAddress u6;
1145 /* convert 'addr' to our internal format */
1146 switch (addr->sa_family)
1149 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
1150 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1151 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1156 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
1157 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1158 sizeof (struct in6_addr));
1159 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1167 /* modify our published address list */
1168 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
1174 * Message tokenizer has broken up an incomming message. Pass it on
1177 * @param cls the 'struct Plugin'
1178 * @param client the 'struct SourceInformation'
1179 * @param hdr the actual message
1182 process_inbound_tokenized_messages (void *cls, void *client,
1183 const struct GNUNET_MessageHeader *hdr)
1185 struct Plugin *plugin = cls;
1186 struct SourceInformation *si = client;
1187 struct GNUNET_ATS_Information ats[2];
1188 struct GNUNET_TIME_Relative delay;
1190 GNUNET_assert (si->session != NULL);
1192 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1193 ats[0].value = htonl (1);
1194 ats[1] = si->session->ats;
1195 GNUNET_break (ntohl(ats[1].value) != GNUNET_ATS_NET_UNSPECIFIED);
1197 delay = plugin->env->receive (plugin->env->cls,
1200 (const struct GNUNET_ATS_Information *) &ats, 2,
1204 si->session->flow_delay_for_other_peer = delay;
1209 * We've received a UDP Message. Process it (pass contents to main service).
1211 * @param plugin plugin context
1212 * @param msg the message
1213 * @param sender_addr sender address
1214 * @param sender_addr_len number of bytes in sender_addr
1217 process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
1218 const struct sockaddr *sender_addr,
1219 socklen_t sender_addr_len)
1221 struct SourceInformation si;
1222 struct Session * s = NULL;
1223 struct IPv4UdpAddress u4;
1224 struct IPv6UdpAddress u6;
1228 if (0 != ntohl (msg->reserved))
1230 GNUNET_break_op (0);
1233 if (ntohs (msg->header.size) <
1234 sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
1236 GNUNET_break_op (0);
1240 /* convert address */
1241 switch (sender_addr->sa_family)
1244 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
1245 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
1246 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1251 GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
1252 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
1253 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
1262 LOG (GNUNET_ERROR_TYPE_DEBUG,
1263 "Received message with %u bytes from peer `%s' at `%s'\n",
1264 (unsigned int) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
1265 GNUNET_a2s (sender_addr, sender_addr_len));
1268 struct GNUNET_HELLO_Address * address = GNUNET_HELLO_address_allocate(&msg->sender, "udp", arg, args);
1269 s = udp_plugin_get_session(plugin, address);
1270 GNUNET_free (address);
1272 /* iterate over all embedded messages */
1274 si.sender = msg->sender;
1278 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
1279 ntohs (msg->header.size) -
1280 sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
1285 * Scan the heap for a receive context with the given address.
1287 * @param cls the 'struct FindReceiveContext'
1288 * @param node internal node of the heap
1289 * @param element value stored at the node (a 'struct ReceiveContext')
1290 * @param cost cost associated with the node
1291 * @return GNUNET_YES if we should continue to iterate,
1295 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1296 void *element, GNUNET_CONTAINER_HeapCostType cost)
1298 struct FindReceiveContext *frc = cls;
1299 struct DefragContext *e = element;
1301 if ((frc->addr_len == e->addr_len) &&
1302 (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1312 * Process a defragmented message.
1314 * @param cls the 'struct ReceiveContext'
1315 * @param msg the message
1318 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
1320 struct DefragContext *rc = cls;
1322 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
1327 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1332 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
1333 rc->src_addr, rc->addr_len);
1336 struct LookupContext
1338 const struct sockaddr * addr;
1341 struct Session *res;
1345 lookup_session_by_addr_it (void *cls, const GNUNET_HashCode * key, void *value)
1347 struct LookupContext *l_ctx = cls;
1348 struct Session * s = value;
1350 if ((s->addrlen == l_ctx->addrlen) &&
1351 (0 == memcmp (s->sock_addr, l_ctx->addr, s->addrlen)))
1360 * Transmit an acknowledgement.
1362 * @param cls the 'struct ReceiveContext'
1363 * @param id message ID (unused)
1364 * @param msg ack to transmit
1367 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
1369 struct DefragContext *rc = cls;
1371 size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
1372 struct UDP_ACK_Message *udp_ack;
1374 struct UDPMessageWrapper *udpw;
1377 struct LookupContext l_ctx;
1378 l_ctx.addr = rc->src_addr;
1379 l_ctx.addrlen = rc->addr_len;
1381 GNUNET_CONTAINER_multihashmap_iterate (rc->plugin->sessions,
1382 &lookup_session_by_addr_it,
1389 if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
1390 delay = s->flow_delay_for_other_peer.rel_value;
1393 LOG (GNUNET_ERROR_TYPE_DEBUG,
1394 "Sending ACK to `%s' including delay of %u ms\n",
1395 GNUNET_a2s (rc->src_addr,
1396 (rc->src_addr->sa_family ==
1397 AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct
1401 udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msize);
1403 udpw->cont_cls = NULL;
1404 udpw->frag_ctx = NULL;
1405 udpw->msg_size = msize;
1407 udpw->timeout = GNUNET_TIME_absolute_get_forever();
1408 udpw->udp = (char *)&udpw[1];
1410 udp_ack = (struct UDP_ACK_Message *) udpw->udp;
1411 udp_ack->header.size = htons ((uint16_t) msize);
1412 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
1413 udp_ack->delay = htonl (delay);
1414 udp_ack->sender = *rc->plugin->env->my_identity;
1415 memcpy (&udp_ack[1], msg, ntohs (msg->size));
1417 enqueue (rc->plugin, udpw);
1421 static void read_process_msg (struct Plugin *plugin,
1422 const struct GNUNET_MessageHeader *msg,
1426 if (ntohs (msg->size) < sizeof (struct UDPMessage))
1428 GNUNET_break_op (0);
1431 process_udp_message (plugin, (const struct UDPMessage *) msg,
1432 (const struct sockaddr *) addr, fromlen);
1436 static void read_process_ack (struct Plugin *plugin,
1437 const struct GNUNET_MessageHeader *msg,
1441 const struct GNUNET_MessageHeader *ack;
1442 const struct UDP_ACK_Message *udp_ack;
1443 struct LookupContext l_ctx;
1444 struct Session *s = NULL;
1445 struct GNUNET_TIME_Relative flow_delay;
1447 if (ntohs (msg->size) <
1448 sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
1450 GNUNET_break_op (0);
1454 udp_ack = (const struct UDP_ACK_Message *) msg;
1456 l_ctx.addr = (const struct sockaddr *) addr;
1457 l_ctx.addrlen = fromlen;
1459 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions,
1460 &lookup_session_by_addr_it,
1464 if ((s == NULL) || (s->frag_ctx == NULL))
1467 flow_delay.rel_value = (uint64_t) ntohl (udp_ack->delay);
1468 LOG (GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %llu\n",
1469 flow_delay.rel_value);
1470 s->flow_delay_from_other_peer =
1471 GNUNET_TIME_relative_to_absolute (flow_delay);
1473 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
1474 if (ntohs (ack->size) !=
1475 ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
1477 GNUNET_break_op (0);
1481 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack))
1484 LOG (GNUNET_ERROR_TYPE_DEBUG,
1485 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
1486 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1487 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1493 LOG (GNUNET_ERROR_TYPE_DEBUG,
1494 "FULL MESSAGE ACKed\n",
1495 (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
1496 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1498 s->last_expected_delay = GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag);
1500 struct UDPMessageWrapper * udpw = NULL;
1501 if (s->addrlen == sizeof (struct sockaddr_in6))
1503 udpw = plugin->ipv6_queue_head;
1506 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1508 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1514 if (s->addrlen == sizeof (struct sockaddr_in))
1516 udpw = plugin->ipv4_queue_head;
1519 if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
1521 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1528 if (s->frag_ctx->cont != NULL)
1530 (s->frag_ctx->cont_cls, &udp_ack->sender, GNUNET_OK);
1531 GNUNET_free (s->frag_ctx);
1536 static void read_process_fragment (struct Plugin *plugin,
1537 const struct GNUNET_MessageHeader *msg,
1541 struct DefragContext *d_ctx;
1542 struct GNUNET_TIME_Absolute now;
1543 struct FindReceiveContext frc;
1547 frc.addr = (const struct sockaddr *) addr;
1548 frc.addr_len = fromlen;
1551 LOG (GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
1552 (unsigned int) ntohs (msg->size),
1553 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1556 /* Lookup existing receive context for this address */
1557 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1558 &find_receive_context,
1560 now = GNUNET_TIME_absolute_get ();
1565 /* Create a new defragmentation context */
1566 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + fromlen);
1567 memcpy (&d_ctx[1], addr, fromlen);
1568 d_ctx->src_addr = (const struct sockaddr *) &d_ctx[1];
1569 d_ctx->addr_len = fromlen;
1570 d_ctx->plugin = plugin;
1572 GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
1573 UDP_MAX_MESSAGES_IN_DEFRAG, d_ctx,
1574 &fragment_msg_proc, &ack_proc);
1576 GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, d_ctx,
1577 (GNUNET_CONTAINER_HeapCostType)
1580 LOG (GNUNET_ERROR_TYPE_DEBUG, "Created new defragmentation context for %u-byte fragment from `%s'\n",
1581 (unsigned int) ntohs (msg->size),
1582 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1588 LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing defragmentation context for %u-byte fragment from `%s'\n",
1589 (unsigned int) ntohs (msg->size),
1590 GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
1594 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
1596 /* keep this 'rc' from expiring */
1597 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs, d_ctx->hnode,
1598 (GNUNET_CONTAINER_HeapCostType)
1601 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
1602 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
1604 /* remove 'rc' that was inactive the longest */
1605 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
1606 GNUNET_assert (NULL != d_ctx);
1607 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1608 GNUNET_free (d_ctx);
1613 * Read and process a message from the given socket.
1615 * @param plugin the overall plugin
1616 * @param rsock socket to read from
1619 udp_select_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
1623 char buf[65536] GNUNET_ALIGN;
1625 const struct GNUNET_MessageHeader *msg;
1627 fromlen = sizeof (addr);
1628 memset (&addr, 0, sizeof (addr));
1629 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
1630 (struct sockaddr *) &addr, &fromlen);
1632 if (size < sizeof (struct GNUNET_MessageHeader))
1634 GNUNET_break_op (0);
1637 msg = (const struct GNUNET_MessageHeader *) buf;
1639 LOG (GNUNET_ERROR_TYPE_DEBUG,
1640 "UDP received %u-byte message from `%s' type %i\n", (unsigned int) size,
1641 GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs (msg->type));
1643 if (size != ntohs (msg->size))
1645 GNUNET_break_op (0);
1649 switch (ntohs (msg->type))
1651 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
1652 udp_broadcast_receive (plugin, &buf, size, addr, fromlen);
1655 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
1656 read_process_msg (plugin, msg, addr, fromlen);
1659 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
1660 read_process_ack (plugin, msg, addr, fromlen);;
1663 case GNUNET_MESSAGE_TYPE_FRAGMENT:
1664 read_process_fragment (plugin, msg, addr, fromlen);
1668 GNUNET_break_op (0);
1674 udp_select_send (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *sock)
1678 struct GNUNET_TIME_Absolute max;
1679 struct GNUNET_TIME_Absolute ;
1681 struct UDPMessageWrapper *udpw = NULL;
1683 if (sock == plugin->sockv4)
1685 udpw = plugin->ipv4_queue_head;
1687 else if (sock == plugin->sockv6)
1689 udpw = plugin->ipv6_queue_head;
1697 const struct sockaddr * sa = udpw->session->sock_addr;
1698 slen = udpw->session->addrlen;
1700 max = GNUNET_TIME_absolute_max(udpw->timeout, GNUNET_TIME_absolute_get());
1702 while (udpw != NULL)
1704 if (max.abs_value != udpw->timeout.abs_value)
1706 /* Message timed out */
1708 if (udpw->cont != NULL)
1709 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1710 if (udpw->frag_ctx != NULL)
1713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Fragmented message for peer `%s' with size %u timed out\n",
1714 GNUNET_i2s(&udpw->session->target), udpw->frag_ctx->bytes_to_send);
1716 udpw->session->last_expected_delay = GNUNET_FRAGMENT_context_destroy(udpw->frag_ctx->frag);
1717 GNUNET_free (udpw->frag_ctx);
1718 udpw->session->frag_ctx = NULL;
1723 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' with size %u timed out\n",
1724 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1728 if (sock == plugin->sockv4)
1730 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1732 udpw = plugin->ipv4_queue_head;
1734 else if (sock == plugin->sockv6)
1736 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1738 udpw = plugin->ipv6_queue_head;
1743 struct GNUNET_TIME_Relative delta = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
1744 if (delta.rel_value == 0)
1746 /* this message is not delayed */
1747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is not delayed \n",
1748 GNUNET_i2s(&udpw->session->target), udpw->msg_size);
1753 /* this message is delayed, try next */
1754 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is delayed for %llu \n",
1755 GNUNET_i2s(&udpw->session->target), udpw->msg_size,
1764 /* No message left */
1768 sent = GNUNET_NETWORK_socket_sendto (sock, udpw->udp, udpw->msg_size, sa, slen);
1770 if (GNUNET_SYSERR == sent)
1772 LOG (GNUNET_ERROR_TYPE_ERROR,
1773 "UDP could not transmit %u-byte message to `%s': `%s'\n",
1774 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen),
1776 if (udpw->cont != NULL)
1777 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
1781 LOG (GNUNET_ERROR_TYPE_DEBUG,
1782 "UDP transmitted %u-byte message to `%s' (%d: %s)\n",
1783 (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
1784 (sent < 0) ? STRERROR (errno) : "ok");
1786 /* This was just a message fragment */
1787 if (udpw->frag_ctx != NULL)
1789 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1791 /* This was a complete message*/
1794 if (udpw->cont != NULL)
1795 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_OK);
1798 if (sock == plugin->sockv4)
1799 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
1800 else if (sock == plugin->sockv6)
1801 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
1809 * We have been notified that our readset has something to read. We don't
1810 * know which socket needs to be read, so we have to check each one
1811 * Then reschedule this function to be called again once more is available.
1813 * @param cls the plugin handle
1814 * @param tc the scheduling context (for rescheduling this function again)
1817 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1819 struct Plugin *plugin = cls;
1821 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1822 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1824 plugin->with_v4_ws = GNUNET_NO;
1826 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1828 if ((NULL != plugin->sockv4) &&
1829 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
1830 udp_select_read (plugin, plugin->sockv4);
1834 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1836 if ((NULL != plugin->sockv4) && (plugin->ipv4_queue_head != NULL) &&
1837 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv4)))
1839 udp_select_send (plugin, plugin->sockv4);
1843 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
1844 GNUNET_SCHEDULER_cancel (plugin->select_task);
1845 plugin->select_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1846 GNUNET_TIME_UNIT_FOREVER_REL,
1848 (plugin->ipv4_queue_head != NULL) ? plugin->ws_v4 : NULL,
1849 &udp_plugin_select, plugin);
1850 if (plugin->ipv4_queue_head != NULL)
1851 plugin->with_v4_ws = GNUNET_YES;
1853 plugin->with_v4_ws = GNUNET_NO;
1858 * We have been notified that our readset has something to read. We don't
1859 * know which socket needs to be read, so we have to check each one
1860 * Then reschedule this function to be called again once more is available.
1862 * @param cls the plugin handle
1863 * @param tc the scheduling context (for rescheduling this function again)
1866 udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1868 struct Plugin *plugin = cls;
1870 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
1871 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1874 plugin->with_v6_ws = GNUNET_NO;
1875 if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
1877 if ((NULL != plugin->sockv6) &&
1878 (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
1879 udp_select_read (plugin, plugin->sockv6);
1882 if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
1884 if ((NULL != plugin->sockv6) && (plugin->ipv6_queue_head != NULL) &&
1885 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv6)))
1887 udp_select_send (plugin, plugin->sockv6);
1890 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
1891 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
1892 plugin->select_task_v6 = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1893 GNUNET_TIME_UNIT_FOREVER_REL,
1895 (plugin->ipv6_queue_head != NULL) ? plugin->ws_v6 : NULL,
1896 &udp_plugin_select_v6, plugin);
1897 if (plugin->ipv6_queue_head != NULL)
1898 plugin->with_v6_ws = GNUNET_YES;
1900 plugin->with_v6_ws = GNUNET_NO;
1905 setup_sockets (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
1908 int sockets_created = 0;
1909 struct sockaddr *serverAddr;
1910 struct sockaddr *addrs[2];
1911 socklen_t addrlens[2];
1914 /* Create IPv6 socket */
1915 if (plugin->enable_ipv6 == GNUNET_YES)
1917 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1918 if (NULL == plugin->sockv6)
1920 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Disabling IPv6 since it is not supported on this system!\n");
1921 plugin->enable_ipv6 = GNUNET_NO;
1925 #if HAVE_SOCKADDR_IN_SIN_LEN
1926 serverAddrv6->sin6_len = sizeof (serverAddrv6);
1928 serverAddrv6->sin6_family = AF_INET6;
1929 serverAddrv6->sin6_addr = in6addr_any;
1930 serverAddrv6->sin6_port = htons (plugin->port);
1931 addrlen = sizeof (struct sockaddr_in6);
1932 serverAddr = (struct sockaddr *) serverAddrv6;
1934 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
1935 ntohs (serverAddrv6->sin6_port));
1938 while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
1941 serverAddrv6->sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1943 LOG (GNUNET_ERROR_TYPE_DEBUG,
1944 "IPv6 Binding failed, trying new port %d\n",
1945 ntohs (serverAddrv6->sin6_port));
1950 GNUNET_NETWORK_socket_close (plugin->sockv6);
1951 plugin->sockv6 = NULL;
1955 if (plugin->sockv6 != NULL)
1958 LOG (GNUNET_ERROR_TYPE_DEBUG,
1959 "IPv6 socket created on port %d\n",
1960 ntohs (serverAddrv6->sin6_port));
1962 addrs[sockets_created] = (struct sockaddr *) serverAddrv6;
1963 addrlens[sockets_created] = sizeof (struct sockaddr_in6);
1969 /* Create IPv4 socket */
1970 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1971 if (NULL == plugin->sockv4)
1973 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
1977 #if HAVE_SOCKADDR_IN_SIN_LEN
1978 serverAddrv4->sin_len = sizeof (serverAddrv4);
1980 serverAddrv4->sin_family = AF_INET;
1981 serverAddrv4->sin_addr.s_addr = INADDR_ANY;
1982 serverAddrv4->sin_port = htons (plugin->port);
1983 addrlen = sizeof (struct sockaddr_in);
1984 serverAddr = (struct sockaddr *) serverAddrv4;
1987 LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
1988 ntohs (serverAddrv4->sin_port));
1991 while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
1994 serverAddrv4->sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1996 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
1997 ntohs (serverAddrv4->sin_port));
2002 GNUNET_NETWORK_socket_close (plugin->sockv4);
2003 plugin->sockv4 = NULL;
2007 if (plugin->sockv4 != NULL)
2009 addrs[sockets_created] = (struct sockaddr *) serverAddrv4;
2010 addrlens[sockets_created] = sizeof (struct sockaddr_in);
2015 /* Create file descriptors */
2016 plugin->rs_v4 = GNUNET_NETWORK_fdset_create ();
2017 plugin->ws_v4 = GNUNET_NETWORK_fdset_create ();
2018 GNUNET_NETWORK_fdset_zero (plugin->rs_v4);
2019 GNUNET_NETWORK_fdset_zero (plugin->ws_v4);
2020 if (NULL != plugin->sockv4)
2022 GNUNET_NETWORK_fdset_set (plugin->rs_v4, plugin->sockv4);
2023 GNUNET_NETWORK_fdset_set (plugin->ws_v4, plugin->sockv4);
2026 if (sockets_created == 0)
2027 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
2029 plugin->select_task =
2030 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2031 GNUNET_TIME_UNIT_FOREVER_REL,
2034 &udp_plugin_select, plugin);
2035 plugin->with_v4_ws = GNUNET_NO;
2037 if (plugin->enable_ipv6 == GNUNET_YES)
2039 plugin->rs_v6 = GNUNET_NETWORK_fdset_create ();
2040 plugin->ws_v6 = GNUNET_NETWORK_fdset_create ();
2041 GNUNET_NETWORK_fdset_zero (plugin->rs_v6);
2042 GNUNET_NETWORK_fdset_zero (plugin->ws_v6);
2043 if (NULL != plugin->sockv6)
2045 GNUNET_NETWORK_fdset_set (plugin->rs_v6, plugin->sockv6);
2046 GNUNET_NETWORK_fdset_set (plugin->ws_v6, plugin->sockv6);
2049 plugin->select_task_v6 =
2050 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2051 GNUNET_TIME_UNIT_FOREVER_REL,
2054 &udp_plugin_select_v6, plugin);
2055 plugin->with_v6_ws = GNUNET_NO;
2058 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
2059 GNUNET_NO, plugin->port,
2061 (const struct sockaddr **) addrs, addrlens,
2062 &udp_nat_port_map_callback, NULL, plugin);
2064 return sockets_created;
2069 * The exported method. Makes the core api available via a global and
2070 * returns the udp transport API.
2072 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2073 * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
2076 libgnunet_plugin_transport_udp_init (void *cls)
2078 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2079 struct GNUNET_TRANSPORT_PluginFunctions *api;
2080 struct Plugin *plugin;
2082 unsigned long long port;
2083 unsigned long long aport;
2084 unsigned long long broadcast;
2085 unsigned long long udp_max_bps;
2086 unsigned long long enable_v6;
2087 char * bind4_address;
2088 char * bind6_address;
2089 struct GNUNET_TIME_Relative interval;
2091 struct sockaddr_in serverAddrv4;
2092 struct sockaddr_in6 serverAddrv6;
2096 if (NULL == env->receive)
2098 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2099 initialze the plugin or the API */
2100 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2102 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2103 api->address_to_string = &udp_address_to_string;
2104 api->string_to_address = &udp_string_to_address;
2108 /* Get port number */
2110 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
2114 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2115 "ADVERTISED_PORT", &aport))
2119 LOG (GNUNET_ERROR_TYPE_WARNING,
2120 _("Given `%s' option is out of range: %llu > %u\n"), "PORT", port,
2127 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat",
2130 enable_v6 = GNUNET_NO;
2133 enable_v6 = GNUNET_YES;
2137 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
2138 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
2141 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2142 "BINDTO", &bind4_address))
2144 LOG (GNUNET_ERROR_TYPE_DEBUG,
2145 "Binding udp plugin to specific address: `%s'\n",
2147 if (1 != inet_pton (AF_INET, bind4_address, &serverAddrv4.sin_addr))
2149 GNUNET_free (bind4_address);
2155 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
2156 "BINDTO6", &bind6_address))
2158 LOG (GNUNET_ERROR_TYPE_DEBUG,
2159 "Binding udp plugin to specific address: `%s'\n",
2162 inet_pton (AF_INET6, bind6_address, &serverAddrv6.sin6_addr))
2164 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
2166 GNUNET_free_non_null (bind4_address);
2167 GNUNET_free (bind6_address);
2173 /* Enable neighbour discovery */
2174 broadcast = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp",
2176 if (broadcast == GNUNET_SYSERR)
2177 broadcast = GNUNET_NO;
2179 if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-udp",
2180 "BROADCAST_INTERVAL", &interval))
2182 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
2185 /* Maximum datarate */
2186 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
2187 "MAX_BPS", &udp_max_bps))
2189 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
2192 plugin = GNUNET_malloc (sizeof (struct Plugin));
2193 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2195 GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
2196 GNUNET_BANDWIDTH_value_init ((uint32_t)udp_max_bps), 30);
2199 plugin->sessions = GNUNET_CONTAINER_multihashmap_create (10);
2200 plugin->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
2201 plugin->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
2202 plugin->port = port;
2203 plugin->aport = aport;
2204 plugin->broadcast_interval = interval;
2205 plugin->enable_ipv6 = enable_v6;
2210 api->disconnect = &udp_disconnect;
2211 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2212 api->address_to_string = &udp_address_to_string;
2213 api->string_to_address = &udp_string_to_address;
2214 api->check_address = &udp_plugin_check_address;
2215 api->get_session = &udp_plugin_get_session;
2216 api->send = &udp_plugin_send;
2218 LOG (GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
2219 res = setup_sockets (plugin, &serverAddrv6, &serverAddrv4);
2220 if ((res == 0) || ((plugin->sockv4 == NULL) && (plugin->sockv6 == NULL)))
2222 LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to create network sockets, plugin failed\n");
2223 GNUNET_free (plugin);
2228 LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting broadcasting\n");
2229 if (broadcast == GNUNET_YES)
2230 setup_broadcast (plugin, &serverAddrv6, &serverAddrv4);
2233 GNUNET_free_non_null (bind4_address);
2234 GNUNET_free_non_null (bind6_address);
2240 heap_cleanup_iterator (void *cls,
2241 struct GNUNET_CONTAINER_HeapNode *
2242 node, void *element,
2243 GNUNET_CONTAINER_HeapCostType
2246 struct DefragContext * d_ctx = element;
2248 GNUNET_CONTAINER_heap_remove_node (node);
2249 GNUNET_DEFRAGMENT_context_destroy(d_ctx->defrag);
2250 GNUNET_free (d_ctx);
2257 * The exported method. Makes the core api available via a global and
2258 * returns the udp transport API.
2260 * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
2264 libgnunet_plugin_transport_udp_done (void *cls)
2266 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2267 struct Plugin *plugin = api->cls;
2275 stop_broadcast (plugin);
2277 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
2279 GNUNET_SCHEDULER_cancel (plugin->select_task);
2280 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
2282 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
2284 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
2285 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
2288 /* Closing sockets */
2289 if (plugin->sockv4 != NULL)
2291 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
2292 plugin->sockv4 = NULL;
2294 GNUNET_NETWORK_fdset_destroy (plugin->rs_v4);
2295 GNUNET_NETWORK_fdset_destroy (plugin->ws_v4);
2297 if (plugin->sockv6 != NULL)
2299 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
2300 plugin->sockv6 = NULL;
2302 GNUNET_NETWORK_fdset_destroy (plugin->rs_v6);
2303 GNUNET_NETWORK_fdset_destroy (plugin->ws_v6);
2306 GNUNET_NAT_unregister (plugin->nat);
2308 if (plugin->defrag_ctxs != NULL)
2310 GNUNET_CONTAINER_heap_iterate(plugin->defrag_ctxs,
2311 heap_cleanup_iterator, NULL);
2312 GNUNET_CONTAINER_heap_destroy(plugin->defrag_ctxs);
2313 plugin->defrag_ctxs = NULL;
2315 if (plugin->mst != NULL)
2317 GNUNET_SERVER_mst_destroy(plugin->mst);
2321 /* Clean up leftover messages */
2322 struct UDPMessageWrapper * udpw;
2323 udpw = plugin->ipv4_queue_head;
2324 while (udpw != NULL)
2326 struct UDPMessageWrapper *tmp = udpw->next;
2327 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
2328 if (udpw->cont != NULL)
2329 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2333 udpw = plugin->ipv6_queue_head;
2334 while (udpw != NULL)
2336 struct UDPMessageWrapper *tmp = udpw->next;
2337 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
2338 if (udpw->cont != NULL)
2339 udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
2344 /* Clean up sessions */
2346 LOG (GNUNET_ERROR_TYPE_DEBUG,
2347 "Cleaning up sessions\n");
2349 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &disconnect_and_free_it, plugin);
2350 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
2353 GNUNET_free (plugin);
2359 /* end of plugin_transport_udp.c */