2 This file is part of GNUnet
3 (C) 2010-2014 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
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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.
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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__)
45 #define UDP_SESSION_TIME_OUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
48 * Number of messages we can defragment in parallel. We only really
49 * defragment 1 message at a time, but if messages get re-ordered, we
50 * may want to keep knowledge about the previous message to avoid
51 * discarding the current message in favor of a single fragment of a
52 * previous message. 3 should be good since we don't expect massive
53 * message reorderings with UDP.
55 #define UDP_MAX_MESSAGES_IN_DEFRAG 3
58 * We keep a defragmentation queue per sender address. How many
59 * sender addresses do we support at the same time? Memory consumption
60 * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this
61 * value. (So 128 corresponds to 12 MB and should suffice for
62 * connecting to roughly 128 peers via UDP).
64 #define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
67 * Running pretty printers: head
69 static struct PrettyPrinterContext *ppc_dll_head;
72 * Running pretty printers: tail
74 static struct PrettyPrinterContext *ppc_dll_tail;
78 * Closure for 'append_port'.
80 struct PrettyPrinterContext
85 struct PrettyPrinterContext *next;
90 struct PrettyPrinterContext *prev;
95 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
100 struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
103 * Function to call with the result.
105 GNUNET_TRANSPORT_AddressStringCallback asc;
113 * Port to add after the IP address.
133 * Which peer is this session for?
135 struct GNUNET_PeerIdentity target;
138 * Plugin this session belongs to.
140 struct Plugin *plugin;
143 * Context for dealing with fragments.
145 struct UDP_FragmentationContext *frag_ctx;
148 * Desired delay for next sending we send to other peer
150 struct GNUNET_TIME_Relative flow_delay_for_other_peer;
153 * Desired delay for next sending we received from other peer
155 struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
158 * Session timeout task
160 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
163 * expected delay for ACKs
165 struct GNUNET_TIME_Relative last_expected_ack_delay;
168 * desired delay between UDP messages
170 struct GNUNET_TIME_Relative last_expected_msg_delay;
172 struct GNUNET_ATS_Information ats;
174 struct GNUNET_HELLO_Address *address;
177 * Reference counter to indicate that this session is
178 * currently being used and must not be destroyed;
179 * setting @e in_destroy will destroy it as soon as
185 * Is this session about to be destroyed (sometimes we cannot
186 * destroy a session immediately as below us on the stack
187 * there might be code that still uses it; in this case,
188 * @e rc is non-zero).
194 * Closure for #session_cmp_it().
196 struct SessionCompareContext
199 const struct GNUNET_HELLO_Address *address;
203 * Closure for #process_inbound_tokenized_messages().
205 struct SourceInformation
210 struct GNUNET_PeerIdentity sender;
218 * Associated session.
220 struct Session *session;
223 * Number of bytes in source address.
230 * Closure for #find_receive_context().
232 struct FindReceiveContext
235 * Where to store the result.
237 struct DefragContext *rc;
242 const struct sockaddr *addr;
244 struct Session *session;
247 * Number of bytes in @e addr.
254 * Data structure to track defragmentation contexts based
255 * on the source of the UDP traffic.
261 * Defragmentation context.
263 struct GNUNET_DEFRAGMENT_Context *defrag;
266 * Source address this receive context is for (allocated at the
267 * end of the struct).
269 const struct sockaddr *src_addr;
272 * Reference to master plugin struct.
274 struct Plugin *plugin;
277 * Node in the defrag heap.
279 struct GNUNET_CONTAINER_HeapNode *hnode;
282 * Length of 'src_addr'
288 * Context to send fragmented messages
290 struct UDP_FragmentationContext
293 * Next in linked list
295 struct UDP_FragmentationContext *next;
298 * Previous in linked list
300 struct UDP_FragmentationContext *prev;
305 struct Plugin *plugin;
308 * Handle for GNUNET_FRAGMENT context
310 struct GNUNET_FRAGMENT_Context *frag;
313 * The session this fragmentation context belongs to
315 struct Session *session;
318 * Function to call upon completion of the transmission.
320 GNUNET_TRANSPORT_TransmitContinuation cont;
323 * Closure for @e cont.
330 struct GNUNET_TIME_Absolute timeout;
333 * Payload size of original unfragmented message
338 * Bytes used to send all fragments on wire including UDP overhead
342 unsigned int fragments_used;
348 * Message types included in a `struct UDP_MessageWrapper`
353 * Uninitialized (error)
358 * Fragment of a message.
360 UMT_MSG_FRAGMENTED = 1,
365 UMT_MSG_FRAGMENTED_COMPLETE = 2,
368 * Unfragmented message.
370 UMT_MSG_UNFRAGMENTED = 3,
373 * Receipt confirmation.
380 struct UDP_MessageWrapper
383 * Session this message belongs to
385 struct Session *session;
391 struct UDP_MessageWrapper *prev;
397 struct UDP_MessageWrapper *next;
402 enum UDP_MessageType msg_type;
405 * Message with size msg_size including UDP specific overhead
410 * Size of UDP message to send including UDP specific overhead
415 * Payload size of original message
422 struct GNUNET_TIME_Absolute timeout;
425 * Function to call upon completion of the transmission.
427 GNUNET_TRANSPORT_TransmitContinuation cont;
430 * Closure for @e cont.
435 * Fragmentation context
436 * frag_ctx == NULL if transport <= MTU
437 * frag_ctx != NULL if transport > MTU
439 struct UDP_FragmentationContext *frag_ctx;
444 * UDP ACK Message-Packet header (after defragmentation).
446 struct UDP_ACK_Message
451 struct GNUNET_MessageHeader header;
454 * Desired delay for flow control
459 * What is the identity of the sender
461 struct GNUNET_PeerIdentity sender;
468 static uint32_t myoptions;
471 * Encapsulation of all of the state of the plugin.
473 struct Plugin * plugin;
477 * We have been notified that our readset has something to read. We don't
478 * know which socket needs to be read, so we have to check each one
479 * Then reschedule this function to be called again once more is available.
481 * @param cls the plugin handle
482 * @param tc the scheduling context (for rescheduling this function again)
485 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
488 * We have been notified that our readset has something to read. We don't
489 * know which socket needs to be read, so we have to check each one
490 * Then reschedule this function to be called again once more is available.
492 * @param cls the plugin handle
493 * @param tc the scheduling context (for rescheduling this function again)
496 udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
499 * (re)schedule select tasks for this plugin.
501 * @param plugin plugin to reschedule
504 schedule_select (struct Plugin *plugin)
506 struct GNUNET_TIME_Relative min_delay;
507 struct UDP_MessageWrapper *udpw;
509 if ((GNUNET_YES == plugin->enable_ipv4) && (NULL != plugin->sockv4))
511 /* Find a message ready to send:
512 * Flow delay from other peer is expired or not set (0) */
513 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
514 for (udpw = plugin->ipv4_queue_head; NULL != udpw; udpw = udpw->next)
515 min_delay = GNUNET_TIME_relative_min (min_delay,
516 GNUNET_TIME_absolute_get_remaining (
517 udpw->session->flow_delay_from_other_peer));
519 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK )
520 GNUNET_SCHEDULER_cancel (plugin->select_task);
523 * - write active set if message is ready
524 * - timeout minimum delay */
525 plugin->select_task = GNUNET_SCHEDULER_add_select (
526 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
527 (0 == min_delay.rel_value_us) ?
528 GNUNET_TIME_UNIT_FOREVER_REL : min_delay, plugin->rs_v4,
529 (0 == min_delay.rel_value_us) ? plugin->ws_v4 : NULL,
530 &udp_plugin_select, plugin);
532 if ((GNUNET_YES == plugin->enable_ipv6) && (NULL != plugin->sockv6))
534 min_delay = GNUNET_TIME_UNIT_FOREVER_REL;
535 for (udpw = plugin->ipv6_queue_head; NULL != udpw; udpw = udpw->next)
536 min_delay = GNUNET_TIME_relative_min (min_delay,
537 GNUNET_TIME_absolute_get_remaining (
538 udpw->session->flow_delay_from_other_peer));
540 if (GNUNET_SCHEDULER_NO_TASK != plugin->select_task_v6)
541 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
542 plugin->select_task_v6 = GNUNET_SCHEDULER_add_select (
543 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
544 (0 == min_delay.rel_value_us) ?
545 GNUNET_TIME_UNIT_FOREVER_REL : min_delay, plugin->rs_v6,
546 (0 == min_delay.rel_value_us) ? plugin->ws_v6 : NULL,
547 &udp_plugin_select_v6, plugin);
553 * Function called for a quick conversion of the binary address to
554 * a numeric address. Note that the caller must not free the
555 * address and that the next call to this function is allowed
556 * to override the address again.
559 * @param addr binary address
560 * @param addrlen length of the address
561 * @return string representing the same address
564 udp_address_to_string (void *cls,
568 static char rbuf[INET6_ADDRSTRLEN + 10];
569 char buf[INET6_ADDRSTRLEN];
573 const struct IPv4UdpAddress *t4;
574 const struct IPv6UdpAddress *t6;
579 if ((NULL != addr) && (addrlen == sizeof(struct IPv6UdpAddress)))
583 options = ntohl (t6->options);
584 port = ntohs (t6->u6_port);
585 memcpy (&a6, &t6->ipv6_addr, sizeof(a6));
588 else if ((NULL != addr) && (addrlen == sizeof(struct IPv4UdpAddress)))
592 options = ntohl (t4->options);
593 port = ntohs (t4->u4_port);
594 memcpy (&a4, &t4->ipv4_addr, sizeof(a4));
601 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
603 GNUNET_snprintf (rbuf, sizeof(rbuf),
604 (af == AF_INET6) ? "%s.%u.[%s]:%u" : "%s.%u.%s:%u", PLUGIN_NAME, options,
611 * Function called to convert a string address to
614 * @param cls closure ('struct Plugin*')
615 * @param addr string address
616 * @param addrlen length of the address
617 * @param buf location to store the buffer
618 * @param added location to store the number of bytes in the buffer.
619 * If the function returns #GNUNET_SYSERR, its contents are undefined.
620 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
623 udp_string_to_address (void *cls,
629 struct sockaddr_storage socket_address;
635 /* Format tcp.options.address:port */
640 if ((NULL == addr) || (addrlen == 0))
643 return GNUNET_SYSERR;
645 if ('\0' != addr[addrlen - 1])
648 return GNUNET_SYSERR;
650 if (strlen (addr) != addrlen - 1)
653 return GNUNET_SYSERR;
655 plugin = GNUNET_strdup (addr);
656 optionstr = strchr (plugin, '.');
657 if (NULL == optionstr)
661 return GNUNET_SYSERR;
665 options = atol (optionstr);
666 address = strchr (optionstr, '.');
671 return GNUNET_SYSERR;
677 GNUNET_STRINGS_to_address_ip (address, strlen (address),
682 return GNUNET_SYSERR;
687 switch (socket_address.ss_family)
691 struct IPv4UdpAddress *u4;
692 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
693 u4 = GNUNET_new (struct IPv4UdpAddress);
694 u4->options = htonl (options);
695 u4->ipv4_addr = in4->sin_addr.s_addr;
696 u4->u4_port = in4->sin_port;
698 *added = sizeof(struct IPv4UdpAddress);
703 struct IPv6UdpAddress *u6;
704 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
705 u6 = GNUNET_new (struct IPv6UdpAddress);
706 u6->options = htonl (options);
707 u6->ipv6_addr = in6->sin6_addr;
708 u6->u6_port = in6->sin6_port;
710 *added = sizeof(struct IPv6UdpAddress);
715 return GNUNET_SYSERR;
721 ppc_cancel_task (void *cls,
722 const struct GNUNET_SCHEDULER_TaskContext *tc)
724 struct PrettyPrinterContext *ppc = cls;
726 ppc->timeout_task = GNUNET_SCHEDULER_NO_TASK;
727 if (NULL != ppc->resolver_handle)
729 GNUNET_RESOLVER_request_cancel (ppc->resolver_handle);
730 ppc->resolver_handle = NULL;
732 GNUNET_CONTAINER_DLL_remove(ppc_dll_head, ppc_dll_tail, ppc);
738 * Append our port and forward the result.
740 * @param cls a 'struct PrettyPrinterContext'
741 * @param hostname result from DNS resolver
744 append_port (void *cls, const char *hostname)
746 struct PrettyPrinterContext *ppc = cls;
747 struct PrettyPrinterContext *cur;
750 if (hostname == NULL )
752 ppc->asc (ppc->asc_cls, NULL, GNUNET_OK); /* Final call, done */
753 GNUNET_CONTAINER_DLL_remove(ppc_dll_head, ppc_dll_tail, ppc);
754 GNUNET_SCHEDULER_cancel (ppc->timeout_task);
755 ppc->timeout_task = GNUNET_SCHEDULER_NO_TASK;
756 ppc->resolver_handle = NULL;
760 for (cur = ppc_dll_head; (NULL != cur); cur = cur->next)
765 ppc->asc (ppc->asc_cls, NULL, GNUNET_SYSERR);
770 if (GNUNET_YES == ppc->ipv6)
771 GNUNET_asprintf (&ret, "%s.%u.[%s]:%d", PLUGIN_NAME, ppc->options, hostname,
774 GNUNET_asprintf (&ret, "%s.%u.%s:%d", PLUGIN_NAME, ppc->options, hostname,
776 ppc->asc (ppc->asc_cls, ret, GNUNET_OK);
782 * Convert the transports address to a nice, human-readable
786 * @param type name of the transport that generated the address
787 * @param addr one of the addresses of the host, NULL for the last address
788 * the specific address format depends on the transport
789 * @param addrlen length of the address
790 * @param numeric should (IP) addresses be displayed in numeric form?
791 * @param timeout after how long should we give up?
792 * @param asc function to call on each string
793 * @param asc_cls closure for @a asc
796 udp_plugin_address_pretty_printer (void *cls,
801 struct GNUNET_TIME_Relative timeout,
802 GNUNET_TRANSPORT_AddressStringCallback asc,
805 struct PrettyPrinterContext *ppc;
808 struct sockaddr_in a4;
809 struct sockaddr_in6 a6;
810 const struct IPv4UdpAddress *u4;
811 const struct IPv6UdpAddress *u6;
815 if (addrlen == sizeof(struct IPv6UdpAddress))
818 memset (&a6, 0, sizeof(a6));
819 a6.sin6_family = AF_INET6;
820 #if HAVE_SOCKADDR_IN_SIN_LEN
821 a6.sin6_len = sizeof (a6);
823 a6.sin6_port = u6->u6_port;
824 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof(struct in6_addr));
825 port = ntohs (u6->u6_port);
826 options = ntohl (u6->options);
830 else if (addrlen == sizeof(struct IPv4UdpAddress))
833 memset (&a4, 0, sizeof(a4));
834 a4.sin_family = AF_INET;
835 #if HAVE_SOCKADDR_IN_SIN_LEN
836 a4.sin_len = sizeof (a4);
838 a4.sin_port = u4->u4_port;
839 a4.sin_addr.s_addr = u4->ipv4_addr;
840 port = ntohs (u4->u4_port);
841 options = ntohl (u4->options);
847 /* invalid address */
849 asc (asc_cls, NULL , GNUNET_SYSERR);
850 asc (asc_cls, NULL, GNUNET_OK);
853 ppc = GNUNET_new (struct PrettyPrinterContext);
855 ppc->asc_cls = asc_cls;
857 ppc->options = options;
858 if (addrlen == sizeof(struct IPv6UdpAddress))
859 ppc->ipv6 = GNUNET_YES;
861 ppc->ipv6 = GNUNET_NO;
862 ppc->timeout_task = GNUNET_SCHEDULER_add_delayed (
863 GNUNET_TIME_relative_multiply (timeout, 2), &ppc_cancel_task, ppc);
864 GNUNET_CONTAINER_DLL_insert(ppc_dll_head, ppc_dll_tail, ppc);
865 ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric,
866 timeout, &append_port, ppc);
871 call_continuation (struct UDP_MessageWrapper *udpw,
876 LOG (GNUNET_ERROR_TYPE_DEBUG,
877 "Calling continuation for %u byte message to `%s' with result %s\n",
878 udpw->payload_size, GNUNET_i2s (&udpw->session->target),
879 (GNUNET_OK == result) ? "OK" : "SYSERR");
881 if (udpw->msg_size >= udpw->payload_size)
882 overhead = udpw->msg_size - udpw->payload_size;
884 overhead = udpw->msg_size;
889 switch (udpw->msg_type)
891 case UMT_MSG_UNFRAGMENTED:
892 if (NULL != udpw->cont)
894 /* Transport continuation */
895 udpw->cont (udpw->cont_cls, &udpw->session->target, result,
896 udpw->payload_size, udpw->msg_size);
898 GNUNET_STATISTICS_update (plugin->env->stats,
899 "# UDP, unfragmented msgs, messages, sent, success", 1, GNUNET_NO);
900 GNUNET_STATISTICS_update (plugin->env->stats,
901 "# UDP, unfragmented msgs, bytes payload, sent, success",
902 udpw->payload_size, GNUNET_NO);
903 GNUNET_STATISTICS_update (plugin->env->stats,
904 "# UDP, unfragmented msgs, bytes overhead, sent, success", overhead,
906 GNUNET_STATISTICS_update (plugin->env->stats,
907 "# UDP, total, bytes overhead, sent", overhead, GNUNET_NO);
908 GNUNET_STATISTICS_update (plugin->env->stats,
909 "# UDP, total, bytes payload, sent", udpw->payload_size, GNUNET_NO);
911 case UMT_MSG_FRAGMENTED_COMPLETE:
912 GNUNET_assert(NULL != udpw->frag_ctx);
913 if (udpw->frag_ctx->cont != NULL )
914 udpw->frag_ctx->cont (udpw->frag_ctx->cont_cls, &udpw->session->target,
915 GNUNET_OK, udpw->frag_ctx->payload_size,
916 udpw->frag_ctx->on_wire_size);
917 GNUNET_STATISTICS_update (plugin->env->stats,
918 "# UDP, fragmented msgs, messages, sent, success", 1, GNUNET_NO);
919 GNUNET_STATISTICS_update (plugin->env->stats,
920 "# UDP, fragmented msgs, bytes payload, sent, success",
921 udpw->payload_size, GNUNET_NO);
922 GNUNET_STATISTICS_update (plugin->env->stats,
923 "# UDP, fragmented msgs, bytes overhead, sent, success", overhead,
925 GNUNET_STATISTICS_update (plugin->env->stats,
926 "# UDP, total, bytes overhead, sent", overhead, GNUNET_NO);
927 GNUNET_STATISTICS_update (plugin->env->stats,
928 "# UDP, total, bytes payload, sent", udpw->payload_size, GNUNET_NO);
929 GNUNET_STATISTICS_update (plugin->env->stats,
930 "# UDP, fragmented msgs, messages, pending", -1, GNUNET_NO);
932 case UMT_MSG_FRAGMENTED:
933 /* Fragmented message: enqueue next fragment */
934 if (NULL != udpw->cont)
935 udpw->cont (udpw->cont_cls, &udpw->session->target, result,
936 udpw->payload_size, udpw->msg_size);
937 GNUNET_STATISTICS_update (plugin->env->stats,
938 "# UDP, fragmented msgs, fragments, sent, success", 1, GNUNET_NO);
939 GNUNET_STATISTICS_update (plugin->env->stats,
940 "# UDP, fragmented msgs, fragments bytes, sent, success",
941 udpw->msg_size, GNUNET_NO);
944 /* No continuation */
945 GNUNET_STATISTICS_update (plugin->env->stats,
946 "# UDP, ACK msgs, messages, sent, success", 1, GNUNET_NO);
947 GNUNET_STATISTICS_update (plugin->env->stats,
948 "# UDP, ACK msgs, bytes overhead, sent, success", overhead,
950 GNUNET_STATISTICS_update (plugin->env->stats,
951 "# UDP, total, bytes overhead, sent", overhead, GNUNET_NO);
959 switch (udpw->msg_type)
961 case UMT_MSG_UNFRAGMENTED:
962 /* Unfragmented message: failed to send */
963 if (NULL != udpw->cont)
964 udpw->cont (udpw->cont_cls, &udpw->session->target, result,
965 udpw->payload_size, overhead);
966 GNUNET_STATISTICS_update (plugin->env->stats,
967 "# UDP, unfragmented msgs, messages, sent, failure", 1, GNUNET_NO);
968 GNUNET_STATISTICS_update (plugin->env->stats,
969 "# UDP, unfragmented msgs, bytes payload, sent, failure",
970 udpw->payload_size, GNUNET_NO);
971 GNUNET_STATISTICS_update (plugin->env->stats,
972 "# UDP, unfragmented msgs, bytes overhead, sent, failure", overhead,
975 case UMT_MSG_FRAGMENTED_COMPLETE:
976 GNUNET_assert(NULL != udpw->frag_ctx);
977 if (udpw->frag_ctx->cont != NULL )
978 udpw->frag_ctx->cont (udpw->frag_ctx->cont_cls, &udpw->session->target,
979 GNUNET_SYSERR, udpw->frag_ctx->payload_size,
980 udpw->frag_ctx->on_wire_size);
981 GNUNET_STATISTICS_update (plugin->env->stats,
982 "# UDP, fragmented msgs, messages, sent, failure", 1, GNUNET_NO);
983 GNUNET_STATISTICS_update (plugin->env->stats,
984 "# UDP, fragmented msgs, bytes payload, sent, failure",
985 udpw->payload_size, GNUNET_NO);
986 GNUNET_STATISTICS_update (plugin->env->stats,
987 "# UDP, fragmented msgs, bytes payload, sent, failure", overhead,
989 GNUNET_STATISTICS_update (plugin->env->stats,
990 "# UDP, fragmented msgs, bytes payload, sent, failure", overhead,
992 GNUNET_STATISTICS_update (plugin->env->stats,
993 "# UDP, fragmented msgs, messages, pending", -1, GNUNET_NO);
995 case UMT_MSG_FRAGMENTED:
996 GNUNET_assert(NULL != udpw->frag_ctx);
997 /* Fragmented message: failed to send */
998 GNUNET_STATISTICS_update (plugin->env->stats,
999 "# UDP, fragmented msgs, fragments, sent, failure", 1, GNUNET_NO);
1000 GNUNET_STATISTICS_update (plugin->env->stats,
1001 "# UDP, fragmented msgs, fragments bytes, sent, failure",
1002 udpw->msg_size, GNUNET_NO);
1005 /* ACK message: failed to send */
1006 GNUNET_STATISTICS_update (plugin->env->stats,
1007 "# UDP, ACK msgs, messages, sent, failure", 1, GNUNET_NO);
1022 * Check if the given port is plausible (must be either our listen
1023 * port or our advertised port). If it is neither, we return
1026 * @param plugin global variables
1027 * @param in_port port number to check
1028 * @return #GNUNET_OK if port is either open_port or adv_port
1031 check_port (struct Plugin *plugin, uint16_t in_port)
1033 if ((in_port == plugin->port) || (in_port == plugin->aport))
1035 return GNUNET_SYSERR;
1040 * Function that will be called to check if a binary address for this
1041 * plugin is well-formed and corresponds to an address for THIS peer
1042 * (as per our configuration). Naturally, if absolutely necessary,
1043 * plugins can be a bit conservative in their answer, but in general
1044 * plugins should make sure that the address does not redirect
1045 * traffic to a 3rd party that might try to man-in-the-middle our
1048 * @param cls closure, should be our handle to the Plugin
1049 * @param addr pointer to the address
1050 * @param addrlen length of @a addr
1051 * @return #GNUNET_OK if this is a plausible address for this peer
1052 * and transport, #GNUNET_SYSERR if not
1056 udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1058 struct Plugin *plugin = cls;
1059 struct IPv4UdpAddress *v4;
1060 struct IPv6UdpAddress *v6;
1062 if ((addrlen != sizeof(struct IPv4UdpAddress))
1063 && (addrlen != sizeof(struct IPv6UdpAddress)))
1066 return GNUNET_SYSERR;
1068 if (addrlen == sizeof(struct IPv4UdpAddress))
1070 v4 = (struct IPv4UdpAddress *) addr;
1071 if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
1072 return GNUNET_SYSERR;
1074 != GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1075 sizeof(struct in_addr)))
1076 return GNUNET_SYSERR;
1080 v6 = (struct IPv6UdpAddress *) addr;
1081 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1084 return GNUNET_SYSERR;
1086 if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
1087 return GNUNET_SYSERR;
1089 != GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1090 sizeof(struct in6_addr)))
1091 return GNUNET_SYSERR;
1098 * Function to free last resources associated with a session.
1100 * @param s session to free
1103 free_session (struct Session *s)
1105 if (NULL != s->frag_ctx)
1107 GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag, NULL, NULL );
1108 GNUNET_free(s->frag_ctx);
1116 dequeue (struct Plugin *plugin,
1117 struct UDP_MessageWrapper * udpw)
1119 if (plugin->bytes_in_buffer < udpw->msg_size)
1123 GNUNET_STATISTICS_update (plugin->env->stats,
1124 "# UDP, total, bytes in buffers", -(long long) udpw->msg_size,
1126 plugin->bytes_in_buffer -= udpw->msg_size;
1128 GNUNET_STATISTICS_update (plugin->env->stats, "# UDP, total, msgs in buffers",
1130 if (udpw->session->address->address_length == sizeof(struct IPv4UdpAddress))
1131 GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head,
1132 plugin->ipv4_queue_tail, udpw);
1133 else if (udpw->session->address->address_length == sizeof(struct IPv6UdpAddress))
1134 GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head,
1135 plugin->ipv6_queue_tail, udpw);
1142 fragmented_message_done (struct UDP_FragmentationContext *fc,
1145 struct UDP_MessageWrapper *udpw;
1146 struct UDP_MessageWrapper *tmp;
1147 struct UDP_MessageWrapper dummy;
1148 struct Session *s = fc->session;
1150 LOG(GNUNET_ERROR_TYPE_DEBUG,
1151 "%p : Fragmented message removed with result %s\n", fc,
1152 (result == GNUNET_SYSERR) ? "FAIL" : "SUCCESS");
1154 /* Call continuation for fragmented message */
1155 memset (&dummy, 0, sizeof(dummy));
1156 dummy.msg_type = UMT_MSG_FRAGMENTED_COMPLETE;
1157 dummy.msg_size = s->frag_ctx->on_wire_size;
1158 dummy.payload_size = s->frag_ctx->payload_size;
1159 dummy.frag_ctx = s->frag_ctx;
1161 dummy.cont_cls = NULL;
1164 call_continuation (&dummy, result);
1166 /* Remove leftover fragments from queue */
1167 if (s->address->address_length == sizeof(struct IPv6UdpAddress))
1169 udpw = plugin->ipv6_queue_head;
1170 while (NULL != udpw)
1173 if ((udpw->frag_ctx != NULL )&& (udpw->frag_ctx == s->frag_ctx)){
1174 dequeue (plugin, udpw);
1175 call_continuation (udpw, GNUNET_SYSERR);
1181 if (s->address->address_length == sizeof(struct IPv4UdpAddress))
1183 udpw = plugin->ipv4_queue_head;
1184 while (udpw != NULL )
1187 if ((NULL != udpw->frag_ctx) && (udpw->frag_ctx == s->frag_ctx))
1189 dequeue (plugin, udpw);
1190 call_continuation (udpw, GNUNET_SYSERR);
1197 /* Destroy fragmentation context */
1198 GNUNET_FRAGMENT_context_destroy (fc->frag, &s->last_expected_msg_delay,
1199 &s->last_expected_ack_delay);
1205 * Scan the heap for a receive context with the given address.
1207 * @param cls the `struct FindReceiveContext`
1208 * @param node internal node of the heap
1209 * @param element value stored at the node (a 'struct ReceiveContext')
1210 * @param cost cost associated with the node
1211 * @return #GNUNET_YES if we should continue to iterate,
1212 * #GNUNET_NO if not.
1215 find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
1216 void *element, GNUNET_CONTAINER_HeapCostType cost)
1218 struct FindReceiveContext *frc = cls;
1219 struct DefragContext *e = element;
1221 if ((frc->addr_len == e->addr_len)
1222 && (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
1232 * Functions with this signature are called whenever we need
1233 * to close a session due to a disconnect or failure to
1234 * establish a connection.
1236 * @param cls closure with the `struct Plugin`
1237 * @param s session to close down
1238 * @return #GNUNET_OK on success
1241 udp_disconnect_session (void *cls, struct Session *s)
1243 struct Plugin *plugin = cls;
1244 struct UDP_MessageWrapper *udpw;
1245 struct UDP_MessageWrapper *next;
1246 struct FindReceiveContext frc;
1248 GNUNET_assert(GNUNET_YES != s->in_destroy);
1249 LOG(GNUNET_ERROR_TYPE_DEBUG, "Session %p to peer `%s' address ended\n", s,
1250 GNUNET_i2s (&s->target),
1251 udp_address_to_string (NULL, s->address->address, s->address->address_length));
1252 /* stop timeout task */
1253 if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
1255 GNUNET_SCHEDULER_cancel (s->timeout_task);
1256 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1258 if (NULL != s->frag_ctx)
1260 /* Remove fragmented message due to disconnect */
1261 fragmented_message_done (s->frag_ctx, GNUNET_SYSERR);
1265 frc.addr = s->address->address;
1266 frc.addr_len = s->address->address_length;
1267 /* Lookup existing receive context for this address */
1268 if (NULL != plugin->defrag_ctxs)
1270 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
1271 &find_receive_context, &frc);
1274 struct DefragContext *d_ctx = frc.rc;
1275 GNUNET_CONTAINER_heap_remove_node (d_ctx->hnode);
1276 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
1277 GNUNET_free (d_ctx);
1281 next = plugin->ipv4_queue_head;
1282 while (NULL != (udpw = next))
1285 if (udpw->session == s)
1287 dequeue (plugin, udpw);
1288 call_continuation (udpw, GNUNET_SYSERR);
1292 next = plugin->ipv6_queue_head;
1293 while (NULL != (udpw = next))
1296 if (udpw->session == s)
1298 dequeue (plugin, udpw);
1299 call_continuation (udpw, GNUNET_SYSERR);
1303 plugin->env->session_end (plugin->env->cls, s->address, s);
1305 if (NULL != s->frag_ctx)
1307 if (NULL != s->frag_ctx->cont)
1309 s->frag_ctx->cont (s->frag_ctx->cont_cls, &s->target, GNUNET_SYSERR,
1310 s->frag_ctx->payload_size, s->frag_ctx->on_wire_size);
1311 LOG(GNUNET_ERROR_TYPE_DEBUG,
1312 "Calling continuation for fragemented message to `%s' with result SYSERR\n",
1313 GNUNET_i2s (&s->target));
1318 GNUNET_YES == GNUNET_CONTAINER_multipeermap_remove (plugin->sessions, &s->target, s));
1319 GNUNET_STATISTICS_set (plugin->env->stats, "# UDP sessions active",
1320 GNUNET_CONTAINER_multipeermap_size (plugin->sessions), GNUNET_NO);
1322 s->in_destroy = GNUNET_YES;
1325 GNUNET_HELLO_address_free (s->address);
1333 * Function that is called to get the keepalive factor.
1334 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
1335 * calculate the interval between keepalive packets.
1337 * @param cls closure with the `struct Plugin`
1338 * @return keepalive factor
1341 udp_query_keepalive_factor (void *cls)
1348 * Destroy a session, plugin is being unloaded.
1350 * @param cls the `struct Plugin`
1351 * @param key hash of public key of target peer
1352 * @param value a `struct PeerSession *` to clean up
1353 * @return #GNUNET_OK (continue to iterate)
1356 disconnect_and_free_it (void *cls,
1357 const struct GNUNET_PeerIdentity *key,
1360 struct Plugin *plugin = cls;
1362 udp_disconnect_session (plugin, value);
1368 * Disconnect from a remote node. Clean up session if we have one for
1371 * @param cls closure for this call (should be handle to Plugin)
1372 * @param target the peeridentity of the peer to disconnect
1373 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the operation failed
1376 udp_disconnect (void *cls,
1377 const struct GNUNET_PeerIdentity *target)
1379 struct Plugin *plugin = cls;
1381 LOG (GNUNET_ERROR_TYPE_DEBUG,
1382 "Disconnecting from peer `%s'\n",
1383 GNUNET_i2s (target));
1384 /* Clean up sessions */
1385 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions, target,
1386 &disconnect_and_free_it, plugin);
1391 * Session was idle, so disconnect it
1393 * @param cls the `struct Session` to time out
1394 * @param tc scheduler context
1397 session_timeout (void *cls,
1398 const struct GNUNET_SCHEDULER_TaskContext *tc)
1400 struct Session *s = cls;
1402 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1404 "Session %p was idle for %s, disconnecting\n",
1406 GNUNET_STRINGS_relative_time_to_string (UDP_SESSION_TIME_OUT,
1408 /* call session destroy function */
1409 udp_disconnect_session (plugin, s);
1414 * Increment session timeout due to activity
1416 * @param s session to reschedule timeout activity for
1419 reschedule_session_timeout (struct Session *s)
1421 if (GNUNET_YES == s->in_destroy)
1423 GNUNET_assert(GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
1424 GNUNET_SCHEDULER_cancel (s->timeout_task);
1425 s->timeout_task = GNUNET_SCHEDULER_add_delayed (UDP_SESSION_TIME_OUT,
1426 &session_timeout, s);
1427 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Timeout restarted for session %p\n", s);
1431 static struct Session *
1432 create_session (struct Plugin *plugin,
1433 const struct GNUNET_HELLO_Address *address)
1437 s = GNUNET_new (struct Session);
1438 s->address = GNUNET_HELLO_address_copy (address);
1439 s->target = address->peer;
1440 s->last_expected_ack_delay = GNUNET_TIME_relative_multiply (
1441 GNUNET_TIME_UNIT_MILLISECONDS, 250);
1442 s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
1443 s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO_ABS;
1444 s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO;
1445 s->timeout_task = GNUNET_SCHEDULER_add_delayed (UDP_SESSION_TIME_OUT,
1446 &session_timeout, s);
1452 session_cmp_it (void *cls,
1453 const struct GNUNET_PeerIdentity *key,
1456 struct SessionCompareContext *cctx = cls;
1457 const struct GNUNET_HELLO_Address *address = cctx->address;
1458 struct Session *s = value;
1460 LOG (GNUNET_ERROR_TYPE_DEBUG,
1461 "Comparing address %s <-> %s\n",
1462 udp_address_to_string (NULL, address->address, address->address_length),
1463 udp_address_to_string (NULL, s->address->address, s->address->address_length));
1465 if (0 == GNUNET_HELLO_address_cmp(s->address, cctx->address))
1475 * Function obtain the network type for a session
1477 * @param cls closure ('struct Plugin*')
1478 * @param session the session
1479 * @return the network type
1481 static enum GNUNET_ATS_Network_Type
1482 udp_get_network (void *cls,
1483 struct Session *session)
1485 return ntohl (session->ats.value);
1490 * Creates a new outbound session the transport service will use to
1491 * send data to the peer
1493 * @param cls the plugin
1494 * @param address the address
1495 * @return the session or NULL of max connections exceeded
1497 static struct Session *
1498 udp_plugin_lookup_session (void *cls,
1499 const struct GNUNET_HELLO_Address *address)
1501 struct Plugin * plugin = cls;
1502 struct IPv6UdpAddress * udp_a6;
1503 struct IPv4UdpAddress * udp_a4;
1505 GNUNET_assert(plugin != NULL);
1506 GNUNET_assert(address != NULL);
1508 if ( (address->address == NULL )||
1509 ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
1510 (address->address_length != sizeof (struct IPv6UdpAddress))))
1512 LOG (GNUNET_ERROR_TYPE_WARNING,
1513 _("Trying to create session for address of unexpected length %u (should be %u or %u)\n"),
1514 address->address_length,
1515 sizeof (struct IPv4UdpAddress),
1516 sizeof (struct IPv6UdpAddress));
1520 if (address->address_length == sizeof(struct IPv4UdpAddress))
1522 if (plugin->sockv4 == NULL)
1524 udp_a4 = (struct IPv4UdpAddress *) address->address;
1525 if (udp_a4->u4_port == 0)
1529 if (address->address_length == sizeof(struct IPv6UdpAddress))
1531 if (plugin->sockv6 == NULL)
1533 udp_a6 = (struct IPv6UdpAddress *) address->address;
1534 if (udp_a6->u6_port == 0)
1538 /* check if session already exists */
1539 struct SessionCompareContext cctx;
1540 cctx.address = address;
1542 LOG(GNUNET_ERROR_TYPE_DEBUG,
1543 "Looking for existing session for peer `%s' `%s' \n",
1544 GNUNET_i2s (&address->peer),
1545 udp_address_to_string(NULL, address->address, address->address_length));
1546 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions, &address->peer,
1547 session_cmp_it, &cctx);
1548 if (cctx.res != NULL )
1550 LOG (GNUNET_ERROR_TYPE_DEBUG,
1551 "Found existing session %p\n",
1559 static struct Session *
1560 udp_plugin_create_session (void *cls,
1561 const struct GNUNET_HELLO_Address *address)
1564 struct IPv4UdpAddress *udp_v4;
1565 struct IPv6UdpAddress *udp_v6;
1567 s = create_session (plugin, address);
1568 if (sizeof (struct IPv4UdpAddress) == address->address_length)
1570 struct sockaddr_in v4;
1571 udp_v4 = (struct IPv4UdpAddress *) address->address;
1572 memset (&v4, '\0', sizeof (v4));
1573 v4.sin_family = AF_INET;
1574 #if HAVE_SOCKADDR_IN_SIN_LEN
1575 v4.sin_len = sizeof (struct sockaddr_in);
1577 v4.sin_port = udp_v4->u4_port;
1578 v4.sin_addr.s_addr = udp_v4->ipv4_addr;
1579 s->ats = plugin->env->get_address_type (plugin->env->cls,
1580 (const struct sockaddr *) &v4, sizeof (v4));
1582 else if (sizeof (struct IPv6UdpAddress) == address->address_length)
1584 struct sockaddr_in6 v6;
1585 udp_v6 = (struct IPv6UdpAddress *) address->address;
1586 memset (&v6, '\0', sizeof (v6));
1587 v6.sin6_family = AF_INET6;
1588 #if HAVE_SOCKADDR_IN_SIN_LEN
1589 v6.sin6_len = sizeof (struct sockaddr_in6);
1591 v6.sin6_port = udp_v6->u6_port;
1592 v6.sin6_addr = udp_v6->ipv6_addr;
1593 s->ats = plugin->env->get_address_type (plugin->env->cls,
1594 (const struct sockaddr *) &v6, sizeof (v6));
1598 return NULL; /* protocol not supported or address invalid */
1599 LOG(GNUNET_ERROR_TYPE_DEBUG,
1600 "Creating new %s session %p for peer `%s' address `%s'\n",
1601 GNUNET_HELLO_address_check_option (address, GNUNET_HELLO_ADDRESS_INFO_INBOUND) ? "inbound" : "outbound",
1602 s, GNUNET_i2s (&address->peer),
1603 udp_address_to_string( NULL,address->address,address->address_length));
1605 GNUNET_OK == GNUNET_CONTAINER_multipeermap_put (plugin->sessions, &s->target, s, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1606 GNUNET_STATISTICS_set (plugin->env->stats, "# UDP sessions active",
1607 GNUNET_CONTAINER_multipeermap_size (plugin->sessions), GNUNET_NO);
1613 udp_plugin_update_session_timeout (void *cls,
1614 const struct GNUNET_PeerIdentity *peer,
1615 struct Session *session)
1618 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions, peer,
1625 /* Reschedule session timeout */
1626 reschedule_session_timeout (session);
1631 * Creates a new outbound session the transport service will use to send data to the
1634 * @param cls the plugin
1635 * @param address the address
1636 * @return the session or NULL of max connections exceeded
1638 static struct Session *
1639 udp_plugin_get_session (void *cls,
1640 const struct GNUNET_HELLO_Address *address)
1644 if (NULL == address)
1649 if ( (address->address_length != sizeof(struct IPv4UdpAddress)) &&
1650 (address->address_length != sizeof(struct IPv6UdpAddress)) )
1653 /* otherwise create new */
1654 if (NULL != (s = udp_plugin_lookup_session (cls, address)))
1656 return udp_plugin_create_session (cls, address);
1661 enqueue (struct Plugin *plugin,
1662 struct UDP_MessageWrapper *udpw)
1664 if (plugin->bytes_in_buffer + udpw->msg_size > INT64_MAX)
1668 GNUNET_STATISTICS_update (plugin->env->stats,
1669 "# UDP, total, bytes in buffers", udpw->msg_size, GNUNET_NO);
1670 plugin->bytes_in_buffer += udpw->msg_size;
1672 GNUNET_STATISTICS_update (plugin->env->stats, "# UDP, total, msgs in buffers",
1674 if (udpw->session->address->address_length == sizeof (struct IPv4UdpAddress))
1675 GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head,
1676 plugin->ipv4_queue_tail, udpw);
1677 else if (udpw->session->address->address_length == sizeof (struct IPv6UdpAddress))
1678 GNUNET_CONTAINER_DLL_insert(plugin->ipv6_queue_head,
1679 plugin->ipv6_queue_tail, udpw);
1686 * Fragment message was transmitted via UDP, let fragmentation know
1687 * to send the next fragment now.
1689 * @param cls the 'struct UDPMessageWrapper' of the fragment
1690 * @param target destination peer (ignored)
1691 * @param result GNUNET_OK on success (ignored)
1692 * @param payload bytes payload sent
1693 * @param physical bytes physical sent
1696 send_next_fragment (void *cls,
1697 const struct GNUNET_PeerIdentity *target,
1702 struct UDP_MessageWrapper *udpw = cls;
1704 GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
1709 * Function that is called with messages created by the fragmentation
1710 * module. In the case of the 'proc' callback of the
1711 * GNUNET_FRAGMENT_context_create function, this function must
1712 * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
1714 * @param cls closure, the 'struct FragmentationContext'
1715 * @param msg the message that was created
1718 enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
1720 struct UDP_FragmentationContext *frag_ctx = cls;
1721 struct Plugin *plugin = frag_ctx->plugin;
1722 struct UDP_MessageWrapper * udpw;
1723 size_t msg_len = ntohs (msg->size);
1725 LOG(GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes\n", msg_len);
1726 frag_ctx->fragments_used++;
1727 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msg_len);
1728 udpw->session = frag_ctx->session;
1729 udpw->msg_buf = (char *) &udpw[1];
1730 udpw->msg_size = msg_len;
1731 udpw->payload_size = msg_len; /*FIXME: minus fragment overhead */
1732 udpw->cont = &send_next_fragment;
1733 udpw->cont_cls = udpw;
1734 udpw->timeout = frag_ctx->timeout;
1735 udpw->frag_ctx = frag_ctx;
1736 udpw->msg_type = UMT_MSG_FRAGMENTED;
1737 memcpy (udpw->msg_buf, msg, msg_len);
1738 enqueue (plugin, udpw);
1739 schedule_select (plugin);
1744 * Function that can be used by the transport service to transmit
1745 * a message using the plugin. Note that in the case of a
1746 * peer disconnecting, the continuation MUST be called
1747 * prior to the disconnect notification itself. This function
1748 * will be called with this peer's HELLO message to initiate
1749 * a fresh connection to another peer.
1751 * @param cls closure
1752 * @param s which session must be used
1753 * @param msgbuf the message to transmit
1754 * @param msgbuf_size number of bytes in 'msgbuf'
1755 * @param priority how important is the message (most plugins will
1756 * ignore message priority and just FIFO)
1757 * @param to how long to wait at most for the transmission (does not
1758 * require plugins to discard the message after the timeout,
1759 * just advisory for the desired delay; most plugins will ignore
1761 * @param cont continuation to call once the message has
1762 * been transmitted (or if the transport is ready
1763 * for the next transmission call; or if the
1764 * peer disconnected...); can be NULL
1765 * @param cont_cls closure for cont
1766 * @return number of bytes used (on the physical network, with overheads);
1767 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1768 * and does NOT mean that the message was not transmitted (DV)
1771 udp_plugin_send (void *cls,
1775 unsigned int priority,
1776 struct GNUNET_TIME_Relative to,
1777 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1779 struct Plugin *plugin = cls;
1780 size_t udpmlen = msgbuf_size + sizeof(struct UDPMessage);
1781 struct UDP_FragmentationContext * frag_ctx;
1782 struct UDP_MessageWrapper * udpw;
1783 struct UDPMessage *udp;
1785 GNUNET_assert(plugin != NULL);
1786 GNUNET_assert(s != NULL);
1788 if ( (s->address->address_length == sizeof(struct IPv6UdpAddress)) &&
1789 (plugin->sockv6 == NULL) )
1790 return GNUNET_SYSERR;
1791 if ( (s->address->address_length == sizeof(struct IPv4UdpAddress)) &&
1792 (plugin->sockv4 == NULL) )
1793 return GNUNET_SYSERR;
1794 if (udpmlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1797 return GNUNET_SYSERR;
1800 != GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
1804 return GNUNET_SYSERR;
1806 LOG (GNUNET_ERROR_TYPE_DEBUG,
1807 "UDP transmits %u-byte message to `%s' using address `%s'\n", udpmlen,
1808 GNUNET_i2s (&s->target),
1809 udp_address_to_string (NULL, s->address->address,
1810 s->address->address_length));
1813 udp = (struct UDPMessage *) mbuf;
1814 udp->header.size = htons (udpmlen);
1815 udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
1816 udp->reserved = htonl (0);
1817 udp->sender = *plugin->env->my_identity;
1819 /* We do not update the session time out here!
1820 * Otherwise this session will not timeout since we send keep alive before
1821 * session can timeout
1823 * For UDP we update session timeout only on receive, this will cover keep
1824 * alives, since remote peer will reply with keep alive response!
1826 if (udpmlen <= UDP_MTU)
1828 /* unfragmented message */
1829 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + udpmlen);
1831 udpw->msg_buf = (char *) &udpw[1];
1832 udpw->msg_size = udpmlen; /* message size with UDP overhead */
1833 udpw->payload_size = msgbuf_size; /* message size without UDP overhead */
1834 udpw->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (), to);
1836 udpw->cont_cls = cont_cls;
1837 udpw->frag_ctx = NULL;
1838 udpw->msg_type = UMT_MSG_UNFRAGMENTED;
1839 memcpy (udpw->msg_buf, udp, sizeof(struct UDPMessage));
1840 memcpy (&udpw->msg_buf[sizeof(struct UDPMessage)], msgbuf, msgbuf_size);
1841 enqueue (plugin, udpw);
1843 GNUNET_STATISTICS_update (plugin->env->stats,
1844 "# UDP, unfragmented msgs, messages, attempt", 1, GNUNET_NO);
1845 GNUNET_STATISTICS_update (plugin->env->stats,
1846 "# UDP, unfragmented msgs, bytes payload, attempt", udpw->payload_size,
1851 /* fragmented message */
1852 if (s->frag_ctx != NULL)
1853 return GNUNET_SYSERR;
1854 memcpy (&udp[1], msgbuf, msgbuf_size);
1855 frag_ctx = GNUNET_new (struct UDP_FragmentationContext);
1856 frag_ctx->plugin = plugin;
1857 frag_ctx->session = s;
1858 frag_ctx->cont = cont;
1859 frag_ctx->cont_cls = cont_cls;
1860 frag_ctx->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
1862 frag_ctx->payload_size = msgbuf_size; /* unfragmented message size without UDP overhead */
1863 frag_ctx->on_wire_size = 0; /* bytes with UDP and fragmentation overhead */
1864 frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
1865 UDP_MTU, &plugin->tracker, s->last_expected_msg_delay,
1866 s->last_expected_ack_delay, &udp->header, &enqueue_fragment, frag_ctx);
1867 s->frag_ctx = frag_ctx;
1868 GNUNET_STATISTICS_update (plugin->env->stats,
1869 "# UDP, fragmented msgs, messages, pending", 1, GNUNET_NO);
1870 GNUNET_STATISTICS_update (plugin->env->stats,
1871 "# UDP, fragmented msgs, messages, attempt", 1, GNUNET_NO);
1872 GNUNET_STATISTICS_update (plugin->env->stats,
1873 "# UDP, fragmented msgs, bytes payload, attempt",
1874 frag_ctx->payload_size, GNUNET_NO);
1876 schedule_select (plugin);
1882 * Our external IP address/port mapping has changed.
1884 * @param cls closure, the `struct LocalAddrList`
1885 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
1886 * the previous (now invalid) one
1887 * @param addr either the previous or the new public IP address
1888 * @param addrlen actual lenght of the address
1891 udp_nat_port_map_callback (void *cls, int add_remove,
1892 const struct sockaddr *addr,
1895 struct Plugin *plugin = cls;
1896 struct GNUNET_HELLO_Address *address;
1897 struct IPv4UdpAddress u4;
1898 struct IPv6UdpAddress u6;
1902 LOG(GNUNET_ERROR_TYPE_INFO, "NAT notification to %s address `%s'\n",
1903 (GNUNET_YES == add_remove) ? "add" : "remove",
1904 GNUNET_a2s (addr, addrlen));
1906 /* convert 'address' to our internal format */
1907 switch (addr->sa_family)
1910 GNUNET_assert(addrlen == sizeof(struct sockaddr_in));
1911 memset (&u4, 0, sizeof(u4));
1912 u4.options = htonl (myoptions);
1913 u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1914 u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
1915 if (0 == ((struct sockaddr_in *) addr)->sin_port)
1918 args = sizeof(struct IPv4UdpAddress);
1921 GNUNET_assert(addrlen == sizeof(struct sockaddr_in6));
1922 memset (&u6, 0, sizeof(u6));
1923 u6.options = htonl (myoptions);
1924 if (0 == ((struct sockaddr_in6 *) addr)->sin6_port)
1926 memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
1927 sizeof(struct in6_addr));
1928 u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
1930 args = sizeof(struct IPv6UdpAddress);
1936 /* modify our published address list */
1937 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
1938 PLUGIN_NAME, arg, args, GNUNET_HELLO_ADDRESS_INFO_NONE);
1939 plugin->env->notify_address (plugin->env->cls, add_remove, address);
1940 GNUNET_HELLO_address_free (address);
1945 * Message tokenizer has broken up an incomming message. Pass it on
1948 * @param cls the 'struct Plugin'
1949 * @param client the `struct SourceInformation`
1950 * @param hdr the actual message
1951 * @return #GNUNET_OK (always)
1954 process_inbound_tokenized_messages (void *cls, void *client,
1955 const struct GNUNET_MessageHeader *hdr)
1957 struct Plugin *plugin = cls;
1958 struct SourceInformation *si = client;
1959 struct GNUNET_TIME_Relative delay;
1961 GNUNET_assert(si->session != NULL);
1962 if (GNUNET_YES == si->session->in_destroy)
1965 GNUNET_break(ntohl (si->session->ats.value) != GNUNET_ATS_NET_UNSPECIFIED);
1966 reschedule_session_timeout (si->session);
1967 delay = plugin->env->receive (plugin->env->cls, si->session->address, si->session, hdr);
1968 plugin->env->update_address_metrics (plugin->env->cls,
1969 si->session->address, si->session,
1970 &si->session->ats, 1);
1971 si->session->flow_delay_for_other_peer = delay;
1977 * We've received a UDP Message. Process it (pass contents to main service).
1979 * @param plugin plugin context
1980 * @param msg the message
1981 * @param sender_addr sender address
1982 * @param sender_addr_len number of bytes in sender_addr
1985 process_udp_message (struct Plugin *plugin,
1986 const struct UDPMessage *msg,
1987 const struct sockaddr *sender_addr,
1988 socklen_t sender_addr_len)
1990 struct SourceInformation si;
1992 struct GNUNET_HELLO_Address *address;
1993 struct IPv4UdpAddress u4;
1994 struct IPv6UdpAddress u6;
1998 if (0 != ntohl (msg->reserved))
2003 if (ntohs (msg->header.size)
2004 < sizeof(struct GNUNET_MessageHeader) + sizeof(struct UDPMessage))
2010 /* convert address */
2011 switch (sender_addr->sa_family)
2014 GNUNET_assert(sender_addr_len == sizeof(struct sockaddr_in));
2015 memset (&u4, 0, sizeof(u4));
2016 u6.options = htonl (0);
2017 u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
2018 u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
2023 GNUNET_assert(sender_addr_len == sizeof(struct sockaddr_in6));
2024 memset (&u6, 0, sizeof(u6));
2025 u6.options = htonl (0);
2026 u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
2027 u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
2035 LOG(GNUNET_ERROR_TYPE_DEBUG,
2036 "Received message with %u bytes from peer `%s' at `%s'\n",
2037 (unsigned int ) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
2038 GNUNET_a2s (sender_addr, sender_addr_len));
2040 address = GNUNET_HELLO_address_allocate ( &msg->sender, PLUGIN_NAME,
2041 arg, args, GNUNET_HELLO_ADDRESS_INFO_INBOUND);
2042 if (NULL == (s = udp_plugin_lookup_session (plugin, address)))
2044 s = udp_plugin_create_session (plugin, address);
2045 plugin->env->session_start (NULL, address, s, NULL, 0);
2047 GNUNET_free(address);
2049 /* iterate over all embedded messages */
2051 si.sender = msg->sender;
2055 GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
2056 ntohs (msg->header.size) - sizeof(struct UDPMessage), GNUNET_YES,
2059 if ((0 == s->rc) && (GNUNET_YES == s->in_destroy))
2064 * Process a defragmented message.
2066 * @param cls the 'struct ReceiveContext'
2067 * @param msg the message
2070 fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
2072 struct DefragContext *rc = cls;
2074 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
2079 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2084 process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
2085 rc->src_addr, rc->addr_len);
2090 * Context to lookup a session based on a IP address
2092 struct LookupContext
2097 struct Session *res;
2100 * The socket address
2102 const struct sockaddr *address;
2105 * The socket address length
2110 * Is a fragmentation context required for the session
2112 int must_have_frag_ctx;
2117 lookup_session_by_sockaddr_it (void *cls,
2118 const struct GNUNET_PeerIdentity *key,
2121 struct LookupContext *l_ctx = cls;
2122 struct Session * s = value;
2123 struct IPv4UdpAddress u4;
2124 struct IPv6UdpAddress u6;
2128 /* convert address */
2129 switch (l_ctx->address->sa_family)
2132 GNUNET_assert(l_ctx->addr_len == sizeof(struct sockaddr_in));
2133 memset (&u4, 0, sizeof(u4));
2134 u6.options = htonl (0);
2135 u4.ipv4_addr = ((struct sockaddr_in *) l_ctx->address)->sin_addr.s_addr;
2136 u4.u4_port = ((struct sockaddr_in *) l_ctx->address)->sin_port;
2141 GNUNET_assert(l_ctx->addr_len == sizeof(struct sockaddr_in6));
2142 memset (&u6, 0, sizeof(u6));
2143 u6.options = htonl (0);
2144 u6.ipv6_addr = ((struct sockaddr_in6 *) l_ctx->address)->sin6_addr;
2145 u6.u6_port = ((struct sockaddr_in6 *) l_ctx->address)->sin6_port;
2155 if ((GNUNET_YES == l_ctx->must_have_frag_ctx) && (NULL == s->frag_ctx))
2158 /* Does not compare peer identities but addresses */
2159 if ((args == s->address->address_length) &&
2160 (0 == memcmp (arg, s->address->address, args)))
2170 * Transmit an acknowledgement.
2172 * @param cls the 'struct ReceiveContext'
2173 * @param id message ID (unused)
2174 * @param msg ack to transmit
2177 ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
2179 struct DefragContext *rc = cls;
2180 size_t msize = sizeof(struct UDP_ACK_Message) + ntohs (msg->size);
2181 struct UDP_ACK_Message *udp_ack;
2183 struct UDP_MessageWrapper *udpw;
2185 struct LookupContext l_ctx;
2187 l_ctx.address = rc->src_addr;
2188 l_ctx.addr_len = rc->addr_len;
2189 l_ctx.must_have_frag_ctx = GNUNET_NO;
2191 GNUNET_CONTAINER_multipeermap_iterate (rc->plugin->sessions,
2192 &lookup_session_by_sockaddr_it, &l_ctx);
2196 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2197 "Trying to transmit ACK to peer `%s' but not session found!\n",
2198 GNUNET_a2s(rc->src_addr, rc->addr_len));
2200 GNUNET_CONTAINER_heap_remove_node (rc->hnode);
2201 GNUNET_DEFRAGMENT_context_destroy (rc->defrag);
2206 if (s->flow_delay_for_other_peer.rel_value_us <= UINT32_MAX)
2207 delay = s->flow_delay_for_other_peer.rel_value_us;
2209 LOG(GNUNET_ERROR_TYPE_DEBUG, "Sending ACK to `%s' including delay of %s\n",
2210 GNUNET_a2s (rc->src_addr, (rc->src_addr->sa_family == AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct sockaddr_in6)),
2211 GNUNET_STRINGS_relative_time_to_string (s->flow_delay_for_other_peer, GNUNET_YES));
2212 udpw = GNUNET_malloc (sizeof (struct UDP_MessageWrapper) + msize);
2213 udpw->msg_size = msize;
2214 udpw->payload_size = 0;
2216 udpw->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
2217 udpw->msg_buf = (char *) &udpw[1];
2218 udpw->msg_type = UMT_MSG_ACK;
2219 udp_ack = (struct UDP_ACK_Message *) udpw->msg_buf;
2220 udp_ack->header.size = htons ((uint16_t) msize);
2221 udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
2222 udp_ack->delay = htonl (delay);
2223 udp_ack->sender = *rc->plugin->env->my_identity;
2224 memcpy (&udp_ack[1], msg, ntohs (msg->size));
2225 enqueue (rc->plugin, udpw);
2226 schedule_select (rc->plugin);
2231 read_process_msg (struct Plugin *plugin,
2232 const struct GNUNET_MessageHeader *msg,
2233 const struct sockaddr *addr,
2236 if (ntohs (msg->size) < sizeof(struct UDPMessage))
2241 process_udp_message (plugin, (const struct UDPMessage *) msg, addr, fromlen);
2246 read_process_ack (struct Plugin *plugin,
2247 const struct GNUNET_MessageHeader *msg,
2248 const struct sockaddr *addr,
2251 const struct GNUNET_MessageHeader *ack;
2252 const struct UDP_ACK_Message *udp_ack;
2253 struct LookupContext l_ctx;
2255 struct GNUNET_TIME_Relative flow_delay;
2257 if (ntohs (msg->size)
2258 < sizeof(struct UDP_ACK_Message) + sizeof(struct GNUNET_MessageHeader))
2263 udp_ack = (const struct UDP_ACK_Message *) msg;
2265 /* Lookup session based on sockaddr */
2266 l_ctx.address = addr;
2267 l_ctx.addr_len = fromlen;
2269 l_ctx.must_have_frag_ctx = GNUNET_YES;
2270 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
2271 &lookup_session_by_sockaddr_it, &l_ctx);
2273 if ((NULL == s) || (NULL == s->frag_ctx))
2278 flow_delay.rel_value_us = (uint64_t) ntohl (udp_ack->delay);
2279 LOG(GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %s\n",
2280 GNUNET_STRINGS_relative_time_to_string (flow_delay, GNUNET_YES));
2281 s->flow_delay_from_other_peer = GNUNET_TIME_relative_to_absolute (flow_delay);
2283 ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
2284 if (ntohs (ack->size) != ntohs (msg->size) - sizeof(struct UDP_ACK_Message))
2291 != memcmp (&l_ctx.res->target, &udp_ack->sender,
2292 sizeof(struct GNUNET_PeerIdentity)))
2294 if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack))
2296 LOG(GNUNET_ERROR_TYPE_DEBUG,
2297 "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
2298 (unsigned int ) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
2299 GNUNET_a2s (addr, fromlen));
2300 /* Expect more ACKs to arrive */
2304 LOG(GNUNET_ERROR_TYPE_DEBUG, "Message full ACK'ed\n",
2305 (unsigned int ) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
2306 GNUNET_a2s (addr, fromlen));
2308 /* Remove fragmented message after successful sending */
2309 fragmented_message_done (s->frag_ctx, GNUNET_OK);
2314 read_process_fragment (struct Plugin *plugin,
2315 const struct GNUNET_MessageHeader *msg,
2316 const struct sockaddr *addr,
2319 struct DefragContext *d_ctx;
2320 struct GNUNET_TIME_Absolute now;
2321 struct FindReceiveContext frc;
2325 frc.addr_len = fromlen;
2327 LOG(GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
2328 (unsigned int ) ntohs (msg->size), GNUNET_a2s (addr, fromlen));
2329 /* Lookup existing receive context for this address */
2330 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
2331 &find_receive_context, &frc);
2332 now = GNUNET_TIME_absolute_get ();
2337 /* Create a new defragmentation context */
2338 d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + fromlen);
2339 memcpy (&d_ctx[1], addr, fromlen);
2340 d_ctx->src_addr = (const struct sockaddr *) &d_ctx[1];
2341 d_ctx->addr_len = fromlen;
2342 d_ctx->plugin = plugin;
2343 d_ctx->defrag = GNUNET_DEFRAGMENT_context_create (plugin->env->stats,
2344 UDP_MTU, UDP_MAX_MESSAGES_IN_DEFRAG, d_ctx, &fragment_msg_proc,
2346 d_ctx->hnode = GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, d_ctx,
2347 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
2348 LOG(GNUNET_ERROR_TYPE_DEBUG,
2349 "Created new defragmentation context for %u-byte fragment from `%s'\n",
2350 (unsigned int ) ntohs (msg->size), GNUNET_a2s (addr, fromlen));
2354 LOG(GNUNET_ERROR_TYPE_DEBUG,
2355 "Found existing defragmentation context for %u-byte fragment from `%s'\n",
2356 (unsigned int ) ntohs (msg->size), GNUNET_a2s (addr, fromlen));
2359 if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
2361 /* keep this 'rc' from expiring */
2362 GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs, d_ctx->hnode,
2363 (GNUNET_CONTAINER_HeapCostType) now.abs_value_us);
2365 if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
2366 UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
2368 /* remove 'rc' that was inactive the longest */
2369 d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
2370 GNUNET_assert(NULL != d_ctx);
2371 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
2378 * Read and process a message from the given socket.
2380 * @param plugin the overall plugin
2381 * @param rsock socket to read from
2384 udp_select_read (struct Plugin *plugin,
2385 struct GNUNET_NETWORK_Handle *rsock)
2388 struct sockaddr_storage addr;
2389 char buf[65536] GNUNET_ALIGN;
2391 const struct GNUNET_MessageHeader *msg;
2393 fromlen = sizeof(addr);
2394 memset (&addr, 0, sizeof(addr));
2395 size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof(buf),
2396 (struct sockaddr *) &addr, &fromlen);
2398 /* On SOCK_DGRAM UDP sockets recvfrom might fail with a
2399 * WSAECONNRESET error to indicate that previous sendto() (yes, sendto!)
2400 * on this socket has failed.
2402 * WSAECONNRESET - The virtual circuit was reset by the remote side
2403 * executing a hard or abortive close. The application should close
2404 * the socket; it is no longer usable. On a UDP-datagram socket this
2405 * error indicates a previous send operation resulted in an ICMP Port
2406 * Unreachable message.
2408 if ( (-1 == size) && (ECONNRESET == errno) )
2413 LOG(GNUNET_ERROR_TYPE_DEBUG, "UDP failed to receive data: %s\n",
2415 /* Connection failure or something. Not a protocol violation. */
2418 if (size < sizeof(struct GNUNET_MessageHeader))
2420 LOG(GNUNET_ERROR_TYPE_WARNING,
2421 "UDP got %u bytes, which is not enough for a GNUnet message header\n",
2422 (unsigned int ) size);
2423 /* _MAY_ be a connection failure (got partial message) */
2424 /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */
2428 msg = (const struct GNUNET_MessageHeader *) buf;
2430 LOG(GNUNET_ERROR_TYPE_DEBUG,
2431 "UDP received %u-byte message from `%s' type %u\n", (unsigned int ) size,
2432 GNUNET_a2s ((const struct sockaddr * ) &addr, fromlen),
2435 if (size != ntohs (msg->size))
2441 GNUNET_STATISTICS_update (plugin->env->stats, "# UDP, total, bytes, received",
2447 switch (ntohs (msg->type))
2449 case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
2450 if (GNUNET_YES == plugin->enable_broadcasting_receiving)
2451 udp_broadcast_receive (plugin, buf, size, (const struct sockaddr *) &addr,
2454 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
2455 read_process_msg (plugin, msg, (const struct sockaddr *) &addr, fromlen);
2457 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
2458 read_process_ack (plugin, msg, (const struct sockaddr *) &addr, fromlen);
2460 case GNUNET_MESSAGE_TYPE_FRAGMENT:
2461 read_process_fragment (plugin, msg, (const struct sockaddr *) &addr,
2471 static struct UDP_MessageWrapper *
2472 remove_timeout_messages_and_select (struct UDP_MessageWrapper *head,
2473 struct GNUNET_NETWORK_Handle *sock)
2475 struct UDP_MessageWrapper *udpw = NULL;
2476 struct GNUNET_TIME_Relative remaining;
2479 while (udpw != NULL )
2481 /* Find messages with timeout */
2482 remaining = GNUNET_TIME_absolute_get_remaining (udpw->timeout);
2483 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
2485 /* Message timed out */
2486 switch (udpw->msg_type)
2488 case UMT_MSG_UNFRAGMENTED:
2489 GNUNET_STATISTICS_update (plugin->env->stats,
2490 "# UDP, total, bytes, sent, timeout", udpw->msg_size, GNUNET_NO);
2491 GNUNET_STATISTICS_update (plugin->env->stats,
2492 "# UDP, total, messages, sent, timeout", 1, GNUNET_NO);
2493 GNUNET_STATISTICS_update (plugin->env->stats,
2494 "# UDP, unfragmented msgs, messages, sent, timeout", 1, GNUNET_NO);
2495 GNUNET_STATISTICS_update (plugin->env->stats,
2496 "# UDP, unfragmented msgs, bytes, sent, timeout",
2497 udpw->payload_size, GNUNET_NO);
2498 /* Not fragmented message */
2499 LOG(GNUNET_ERROR_TYPE_DEBUG,
2500 "Message for peer `%s' with size %u timed out\n",
2501 GNUNET_i2s (&udpw->session->target), udpw->payload_size);
2502 call_continuation (udpw, GNUNET_SYSERR);
2503 /* Remove message */
2504 dequeue (plugin, udpw);
2507 case UMT_MSG_FRAGMENTED:
2508 /* Fragmented message */
2509 GNUNET_STATISTICS_update (plugin->env->stats,
2510 "# UDP, total, bytes, sent, timeout", udpw->frag_ctx->on_wire_size,
2512 GNUNET_STATISTICS_update (plugin->env->stats,
2513 "# UDP, total, messages, sent, timeout", 1, GNUNET_NO);
2514 call_continuation (udpw, GNUNET_SYSERR);
2515 LOG(GNUNET_ERROR_TYPE_DEBUG,
2516 "Fragment for message for peer `%s' with size %u timed out\n",
2517 GNUNET_i2s (&udpw->session->target), udpw->frag_ctx->payload_size);
2519 GNUNET_STATISTICS_update (plugin->env->stats,
2520 "# UDP, fragmented msgs, messages, sent, timeout", 1, GNUNET_NO);
2521 GNUNET_STATISTICS_update (plugin->env->stats,
2522 "# UDP, fragmented msgs, bytes, sent, timeout",
2523 udpw->frag_ctx->payload_size, GNUNET_NO);
2524 /* Remove fragmented message due to timeout */
2525 fragmented_message_done (udpw->frag_ctx, GNUNET_SYSERR);
2528 GNUNET_STATISTICS_update (plugin->env->stats,
2529 "# UDP, total, bytes, sent, timeout", udpw->msg_size, GNUNET_NO);
2530 GNUNET_STATISTICS_update (plugin->env->stats,
2531 "# UDP, total, messages, sent, timeout", 1, GNUNET_NO);
2532 LOG(GNUNET_ERROR_TYPE_DEBUG,
2533 "ACK Message for peer `%s' with size %u timed out\n",
2534 GNUNET_i2s (&udpw->session->target), udpw->payload_size);
2535 call_continuation (udpw, GNUNET_SYSERR);
2536 dequeue (plugin, udpw);
2542 if (sock == plugin->sockv4)
2543 udpw = plugin->ipv4_queue_head;
2544 else if (sock == plugin->sockv6)
2545 udpw = plugin->ipv6_queue_head;
2548 GNUNET_break(0); /* should never happen */
2551 GNUNET_STATISTICS_update (plugin->env->stats,
2552 "# messages dismissed due to timeout", 1, GNUNET_NO);
2556 /* Message did not time out, check flow delay */
2557 remaining = GNUNET_TIME_absolute_get_remaining (
2558 udpw->session->flow_delay_from_other_peer);
2559 if (GNUNET_TIME_UNIT_ZERO.rel_value_us == remaining.rel_value_us)
2561 /* this message is not delayed */
2562 LOG(GNUNET_ERROR_TYPE_DEBUG,
2563 "Message for peer `%s' (%u bytes) is not delayed \n",
2564 GNUNET_i2s (&udpw->session->target), udpw->payload_size);
2565 break; /* Found message to send, break */
2569 /* Message is delayed, try next */
2570 LOG(GNUNET_ERROR_TYPE_DEBUG,
2571 "Message for peer `%s' (%u bytes) is delayed for %s\n",
2572 GNUNET_i2s (&udpw->session->target), udpw->payload_size,
2573 GNUNET_STRINGS_relative_time_to_string (remaining, GNUNET_YES));
2583 analyze_send_error (struct Plugin *plugin,
2584 const struct sockaddr *sa,
2585 socklen_t slen, int error)
2587 static int network_down_error;
2588 struct GNUNET_ATS_Information type;
2590 type = plugin->env->get_address_type (plugin->env->cls, sa, slen);
2591 if (((GNUNET_ATS_NET_LAN == ntohl (type.value))
2592 || (GNUNET_ATS_NET_WAN == ntohl (type.value)))
2593 && ((ENETUNREACH == errno)|| (ENETDOWN == errno)))
2595 if ((network_down_error == GNUNET_NO) && (slen == sizeof (struct sockaddr_in)))
2597 /* IPv4: "Network unreachable" or "Network down"
2599 * This indicates we do not have connectivity
2601 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
2602 _("UDP could not transmit message to `%s': "
2603 "Network seems down, please check your network configuration\n"),
2604 GNUNET_a2s (sa, slen));
2606 if ((network_down_error == GNUNET_NO) && (slen == sizeof (struct sockaddr_in6)))
2608 /* IPv6: "Network unreachable" or "Network down"
2610 * This indicates that this system is IPv6 enabled, but does not
2611 * have a valid global IPv6 address assigned or we do not have
2615 LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
2616 _("UDP could not transmit IPv6 message! "
2617 "Please check your network configuration and disable IPv6 if your "
2618 "connection does not have a global IPv6 address\n"));
2623 LOG (GNUNET_ERROR_TYPE_WARNING,
2624 "UDP could not transmit message to `%s': `%s'\n",
2625 GNUNET_a2s (sa, slen), STRERROR (error));
2631 udp_select_send (struct Plugin *plugin,
2632 struct GNUNET_NETWORK_Handle *sock)
2637 const struct IPv4UdpAddress *u4;
2638 struct sockaddr_in a4;
2639 const struct IPv6UdpAddress *u6;
2640 struct sockaddr_in6 a6;
2641 struct UDP_MessageWrapper *udpw;
2643 /* Find message to send */
2644 udpw = remove_timeout_messages_and_select ((sock == plugin->sockv4)
2645 ? plugin->ipv4_queue_head
2646 : plugin->ipv6_queue_head,
2649 return 0; /* No message to send */
2651 if (sizeof (struct IPv4UdpAddress) == udpw->session->address->address_length)
2653 u4 = udpw->session->address->address;
2654 memset (&a4, 0, sizeof(a4));
2655 a4.sin_family = AF_INET;
2656 #if HAVE_SOCKADDR_IN_SIN_LEN
2657 a4.sin_len = sizeof (a4);
2659 a4.sin_port = u4->u4_port;
2660 memcpy (&a4.sin_addr, &u4->ipv4_addr, sizeof(struct in_addr));
2661 a = (struct sockaddr *) &a4;
2664 else if (sizeof (struct IPv6UdpAddress) == udpw->session->address->address_length)
2666 u6 = udpw->session->address->address;
2667 memset (&a6, 0, sizeof(a6));
2668 a6.sin6_family = AF_INET6;
2669 #if HAVE_SOCKADDR_IN_SIN_LEN
2670 a6.sin6_len = sizeof (a6);
2672 a6.sin6_port = u6->u6_port;
2673 memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof(struct in6_addr));
2674 a = (struct sockaddr *) &a6;
2679 call_continuation (udpw, GNUNET_OK);
2680 dequeue (plugin, udpw);
2682 return GNUNET_SYSERR;
2685 sent = GNUNET_NETWORK_socket_sendto (sock, udpw->msg_buf, udpw->msg_size, a,
2688 if (GNUNET_SYSERR == sent)
2691 analyze_send_error (plugin, a, slen, errno);
2692 call_continuation (udpw, GNUNET_SYSERR);
2693 GNUNET_STATISTICS_update (plugin->env->stats,
2694 "# UDP, total, bytes, sent, failure", sent, GNUNET_NO);
2695 GNUNET_STATISTICS_update (plugin->env->stats,
2696 "# UDP, total, messages, sent, failure", 1, GNUNET_NO);
2701 LOG(GNUNET_ERROR_TYPE_DEBUG,
2702 "UDP transmitted %u-byte message to `%s' `%s' (%d: %s)\n",
2703 (unsigned int ) (udpw->msg_size), GNUNET_i2s (&udpw->session->target),
2704 GNUNET_a2s (a, slen), (int ) sent,
2705 (sent < 0) ? STRERROR (errno) : "ok");
2706 GNUNET_STATISTICS_update (plugin->env->stats,
2707 "# UDP, total, bytes, sent, success", sent, GNUNET_NO);
2708 GNUNET_STATISTICS_update (plugin->env->stats,
2709 "# UDP, total, messages, sent, success", 1, GNUNET_NO);
2710 if (NULL != udpw->frag_ctx)
2711 udpw->frag_ctx->on_wire_size += udpw->msg_size;
2712 call_continuation (udpw, GNUNET_OK);
2714 dequeue (plugin, udpw);
2723 * We have been notified that our readset has something to read. We don't
2724 * know which socket needs to be read, so we have to check each one
2725 * Then reschedule this function to be called again once more is available.
2727 * @param cls the plugin handle
2728 * @param tc the scheduling context (for rescheduling this function again)
2731 udp_plugin_select (void *cls,
2732 const struct GNUNET_SCHEDULER_TaskContext *tc)
2734 struct Plugin *plugin = cls;
2736 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
2737 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2739 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
2740 && (NULL != plugin->sockv4)
2741 && (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
2742 udp_select_read (plugin, plugin->sockv4);
2743 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY))
2744 && (NULL != plugin->sockv4) && (NULL != plugin->ipv4_queue_head)
2745 && (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv4)))
2746 udp_select_send (plugin, plugin->sockv4);
2747 schedule_select (plugin);
2752 * We have been notified that our readset has something to read. We don't
2753 * know which socket needs to be read, so we have to check each one
2754 * Then reschedule this function to be called again once more is available.
2756 * @param cls the plugin handle
2757 * @param tc the scheduling context (for rescheduling this function again)
2760 udp_plugin_select_v6 (void *cls,
2761 const struct GNUNET_SCHEDULER_TaskContext *tc)
2763 struct Plugin *plugin = cls;
2765 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
2766 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2768 if (((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
2769 && (NULL != plugin->sockv6)
2770 && (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
2771 udp_select_read (plugin, plugin->sockv6);
2772 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY))
2773 && (NULL != plugin->sockv6) && (plugin->ipv6_queue_head != NULL )&&
2774 (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv6)) )udp_select_send (plugin, plugin->sockv6);
2775 schedule_select (plugin);
2780 * Setup the UDP sockets (for IPv4 and IPv6) for the plugin.
2782 * @param plugin the plugin to initialize
2783 * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any')
2784 * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any')
2785 * @return number of sockets that were successfully bound
2788 setup_sockets (struct Plugin *plugin,
2789 const struct sockaddr_in6 *bind_v6,
2790 const struct sockaddr_in *bind_v4)
2793 int sockets_created = 0;
2794 struct sockaddr_in6 server_addrv6;
2795 struct sockaddr_in server_addrv4;
2796 struct sockaddr *server_addr;
2797 struct sockaddr *addrs[2];
2798 socklen_t addrlens[2];
2802 /* Create IPv6 socket */
2804 if (GNUNET_YES == plugin->enable_ipv6)
2806 plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
2807 if (NULL == plugin->sockv6)
2809 LOG(GNUNET_ERROR_TYPE_WARNING,
2810 "Disabling IPv6 since it is not supported on this system!\n");
2811 plugin->enable_ipv6 = GNUNET_NO;
2815 memset (&server_addrv6, '\0', sizeof(struct sockaddr_in6));
2816 #if HAVE_SOCKADDR_IN_SIN_LEN
2817 server_addrv6.sin6_len = sizeof (struct sockaddr_in6);
2819 server_addrv6.sin6_family = AF_INET6;
2820 if (NULL != bind_v6)
2821 server_addrv6.sin6_addr = bind_v6->sin6_addr;
2823 server_addrv6.sin6_addr = in6addr_any;
2825 if (0 == plugin->port) /* autodetect */
2826 server_addrv6.sin6_port = htons (
2827 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537)
2830 server_addrv6.sin6_port = htons (plugin->port);
2831 addrlen = sizeof(struct sockaddr_in6);
2832 server_addr = (struct sockaddr *) &server_addrv6;
2837 LOG(GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 `%s'\n",
2838 GNUNET_a2s (server_addr, addrlen));
2841 == GNUNET_NETWORK_socket_bind (plugin->sockv6, server_addr,
2845 if (0 != plugin->port)
2847 tries = 10; /* fail */
2848 break; /* bind failed on specific port */
2851 server_addrv6.sin6_port = htons (
2852 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537)
2858 GNUNET_NETWORK_socket_close (plugin->sockv6);
2859 plugin->enable_ipv6 = GNUNET_NO;
2860 plugin->sockv6 = NULL;
2863 if (plugin->sockv6 != NULL )
2865 LOG(GNUNET_ERROR_TYPE_DEBUG, "IPv6 socket created on port %s\n",
2866 GNUNET_a2s (server_addr, addrlen));
2867 addrs[sockets_created] = (struct sockaddr *) &server_addrv6;
2868 addrlens[sockets_created] = sizeof(struct sockaddr_in6);
2873 LOG(GNUNET_ERROR_TYPE_ERROR, "Failed to bind UDP socket to %s: %s\n",
2874 GNUNET_a2s (server_addr, addrlen), STRERROR (eno));
2879 /* Create IPv4 socket */
2881 plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
2882 if (NULL == plugin->sockv4)
2884 GNUNET_log_strerror(GNUNET_ERROR_TYPE_WARNING, "socket");
2885 LOG(GNUNET_ERROR_TYPE_WARNING,
2886 "Disabling IPv4 since it is not supported on this system!\n");
2887 plugin->enable_ipv4 = GNUNET_NO;
2891 memset (&server_addrv4, '\0', sizeof(struct sockaddr_in));
2892 #if HAVE_SOCKADDR_IN_SIN_LEN
2893 server_addrv4.sin_len = sizeof (struct sockaddr_in);
2895 server_addrv4.sin_family = AF_INET;
2896 if (NULL != bind_v4)
2897 server_addrv4.sin_addr = bind_v4->sin_addr;
2899 server_addrv4.sin_addr.s_addr = INADDR_ANY;
2901 if (0 == plugin->port)
2903 server_addrv4.sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
2907 server_addrv4.sin_port = htons (plugin->port);
2909 addrlen = sizeof(struct sockaddr_in);
2910 server_addr = (struct sockaddr *) &server_addrv4;
2915 LOG (GNUNET_ERROR_TYPE_DEBUG,
2916 "Binding to IPv4 `%s'\n",
2917 GNUNET_a2s (server_addr, addrlen));
2921 == GNUNET_NETWORK_socket_bind (plugin->sockv4, server_addr, addrlen))
2924 if (0 != plugin->port)
2926 tries = 10; /* fail */
2927 break; /* bind failed on specific port */
2931 server_addrv4.sin_port = htons (
2932 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537)
2939 GNUNET_NETWORK_socket_close (plugin->sockv4);
2940 plugin->enable_ipv4 = GNUNET_NO;
2941 plugin->sockv4 = NULL;
2944 if (NULL != plugin->sockv4)
2946 LOG(GNUNET_ERROR_TYPE_DEBUG, "IPv4 socket created on port %s\n",
2947 GNUNET_a2s (server_addr, addrlen));
2948 addrs[sockets_created] = (struct sockaddr *) &server_addrv4;
2949 addrlens[sockets_created] = sizeof(struct sockaddr_in);
2954 LOG(GNUNET_ERROR_TYPE_ERROR, "Failed to bind UDP socket to %s: %s\n",
2955 GNUNET_a2s (server_addr, addrlen), STRERROR (eno));
2959 if (0 == sockets_created)
2961 LOG(GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
2962 return 0; /* No sockets created, return */
2965 /* Create file descriptors */
2966 if (plugin->enable_ipv4 == GNUNET_YES)
2968 plugin->rs_v4 = GNUNET_NETWORK_fdset_create ();
2969 plugin->ws_v4 = GNUNET_NETWORK_fdset_create ();
2970 GNUNET_NETWORK_fdset_zero (plugin->rs_v4);
2971 GNUNET_NETWORK_fdset_zero (plugin->ws_v4);
2972 if (NULL != plugin->sockv4)
2974 GNUNET_NETWORK_fdset_set (plugin->rs_v4, plugin->sockv4);
2975 GNUNET_NETWORK_fdset_set (plugin->ws_v4, plugin->sockv4);
2979 if (plugin->enable_ipv6 == GNUNET_YES)
2981 plugin->rs_v6 = GNUNET_NETWORK_fdset_create ();
2982 plugin->ws_v6 = GNUNET_NETWORK_fdset_create ();
2983 GNUNET_NETWORK_fdset_zero (plugin->rs_v6);
2984 GNUNET_NETWORK_fdset_zero (plugin->ws_v6);
2985 if (NULL != plugin->sockv6)
2987 GNUNET_NETWORK_fdset_set (plugin->rs_v6, plugin->sockv6);
2988 GNUNET_NETWORK_fdset_set (plugin->ws_v6, plugin->sockv6);
2992 schedule_select (plugin);
2993 plugin->nat = GNUNET_NAT_register (plugin->env->cfg, GNUNET_NO, plugin->port,
2995 (const struct sockaddr **) addrs, addrlens,
2996 &udp_nat_port_map_callback, NULL, plugin);
2998 return sockets_created;
3003 * The exported method. Makes the core api available via a global and
3004 * returns the udp transport API.
3006 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3007 * @return our `struct GNUNET_TRANSPORT_PluginFunctions`
3010 libgnunet_plugin_transport_udp_init (void *cls)
3012 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
3013 struct GNUNET_TRANSPORT_PluginFunctions *api;
3015 unsigned long long port;
3016 unsigned long long aport;
3017 unsigned long long udp_max_bps;
3018 unsigned long long enable_v6;
3019 unsigned long long enable_broadcasting;
3020 unsigned long long enable_broadcasting_recv;
3021 char *bind4_address;
3022 char *bind6_address;
3023 char *fancy_interval;
3024 struct GNUNET_TIME_Relative interval;
3025 struct sockaddr_in server_addrv4;
3026 struct sockaddr_in6 server_addrv6;
3031 if (NULL == env->receive)
3033 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
3034 initialze the plugin or the API */
3035 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3037 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3038 api->address_to_string = &udp_address_to_string;
3039 api->string_to_address = &udp_string_to_address;
3043 /* Get port number: port == 0 : autodetect a port,
3044 * > 0 : use this port, not given : 2086 default */
3046 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
3050 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
3051 "ADVERTISED_PORT", &aport))
3055 LOG (GNUNET_ERROR_TYPE_WARNING,
3056 _("Given `%s' option is out of range: %llu > %u\n"),
3064 GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat", "DISABLEV6"))
3065 enable_v6 = GNUNET_NO;
3067 enable_v6 = GNUNET_YES;
3070 have_bind4 = GNUNET_NO;
3071 memset (&server_addrv4, 0, sizeof(server_addrv4));
3072 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
3073 "BINDTO", &bind4_address))
3075 LOG (GNUNET_ERROR_TYPE_DEBUG,
3076 "Binding udp plugin to specific address: `%s'\n",
3078 if (1 != inet_pton (AF_INET, bind4_address, &server_addrv4.sin_addr))
3080 GNUNET_free (bind4_address);
3083 have_bind4 = GNUNET_YES;
3085 GNUNET_free_non_null(bind4_address);
3086 have_bind6 = GNUNET_NO;
3087 memset (&server_addrv6, 0, sizeof(server_addrv6));
3089 GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
3090 "BINDTO6", &bind6_address))
3092 LOG (GNUNET_ERROR_TYPE_DEBUG,
3093 "Binding udp plugin to specific address: `%s'\n", bind6_address);
3094 if (1 != inet_pton (AF_INET6, bind6_address, &server_addrv6.sin6_addr))
3096 LOG (GNUNET_ERROR_TYPE_ERROR,
3097 _("Invalid IPv6 address: `%s'\n"),
3099 GNUNET_free (bind6_address);
3102 have_bind6 = GNUNET_YES;
3104 GNUNET_free_non_null (bind6_address);
3106 /* Initialize my flags */
3109 /* Enable neighbour discovery */
3110 enable_broadcasting = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3111 "transport-udp", "BROADCAST");
3112 if (enable_broadcasting == GNUNET_SYSERR)
3113 enable_broadcasting = GNUNET_NO;
3115 enable_broadcasting_recv = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
3116 "transport-udp", "BROADCAST_RECEIVE");
3117 if (enable_broadcasting_recv == GNUNET_SYSERR)
3118 enable_broadcasting_recv = GNUNET_YES;
3121 == GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
3122 "BROADCAST_INTERVAL", &fancy_interval))
3124 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
3129 == GNUNET_STRINGS_fancy_time_to_relative (fancy_interval, &interval))
3131 interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30);
3133 GNUNET_free(fancy_interval);
3136 /* Maximum datarate */
3138 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
3139 "MAX_BPS", &udp_max_bps))
3141 udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
3144 p = GNUNET_new (struct Plugin);
3147 p->broadcast_interval = interval;
3148 p->enable_ipv6 = enable_v6;
3149 p->enable_ipv4 = GNUNET_YES; /* default */
3150 p->enable_broadcasting = enable_broadcasting;
3151 p->enable_broadcasting_receiving = enable_broadcasting_recv;
3153 p->sessions = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
3154 p->defrag_ctxs = GNUNET_CONTAINER_heap_create (
3155 GNUNET_CONTAINER_HEAP_ORDER_MIN);
3156 p->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, p);
3157 GNUNET_BANDWIDTH_tracker_init (&p->tracker, NULL, NULL,
3158 GNUNET_BANDWIDTH_value_init ((uint32_t) udp_max_bps), 30);
3161 LOG(GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
3162 res = setup_sockets (p,
3163 (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL,
3164 (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL);
3165 if ((res == 0) || ((p->sockv4 == NULL )&& (p->sockv6 == NULL)))
3167 LOG (GNUNET_ERROR_TYPE_ERROR,
3168 _("Failed to create network sockets, plugin failed\n"));
3169 GNUNET_CONTAINER_multipeermap_destroy (p->sessions);
3170 GNUNET_CONTAINER_heap_destroy (p->defrag_ctxs);
3171 GNUNET_SERVER_mst_destroy (p->mst);
3176 /* Setup broadcasting and receiving beacons */
3177 setup_broadcast (p, &server_addrv6, &server_addrv4);
3179 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3182 api->disconnect_session = &udp_disconnect_session;
3183 api->query_keepalive_factor = &udp_query_keepalive_factor;
3184 api->disconnect_peer = &udp_disconnect;
3185 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
3186 api->address_to_string = &udp_address_to_string;
3187 api->string_to_address = &udp_string_to_address;
3188 api->check_address = &udp_plugin_check_address;
3189 api->get_session = &udp_plugin_get_session;
3190 api->send = &udp_plugin_send;
3191 api->get_network = &udp_get_network;
3192 api->update_session_timeout = &udp_plugin_update_session_timeout;
3198 * Function called on each entry in the defragmentation heap to
3202 * @param node node in the heap (to be removed)
3203 * @param element a `struct DefragContext` to be cleaned up
3204 * @param cost unused
3205 * @return #GNUNET_YES
3208 heap_cleanup_iterator (void *cls,
3209 struct GNUNET_CONTAINER_HeapNode *node,
3211 GNUNET_CONTAINER_HeapCostType cost)
3213 struct DefragContext *d_ctx = element;
3215 GNUNET_CONTAINER_heap_remove_node (node);
3216 GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
3217 GNUNET_free (d_ctx);
3223 * The exported method. Makes the core api available via a global and
3224 * returns the udp transport API.
3226 * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
3230 libgnunet_plugin_transport_udp_done (void *cls)
3232 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
3233 struct Plugin *plugin = api->cls;
3234 struct PrettyPrinterContext *cur;
3235 struct PrettyPrinterContext *next;
3236 struct UDP_MessageWrapper *udpw;
3243 stop_broadcast (plugin);
3244 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK )
3246 GNUNET_SCHEDULER_cancel (plugin->select_task);
3247 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
3249 if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK )
3251 GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
3252 plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
3255 /* Closing sockets */
3256 if (GNUNET_YES == plugin->enable_ipv4)
3258 if (NULL != plugin->sockv4)
3260 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
3261 plugin->sockv4 = NULL;
3263 GNUNET_NETWORK_fdset_destroy (plugin->rs_v4);
3264 GNUNET_NETWORK_fdset_destroy (plugin->ws_v4);
3266 if (GNUNET_YES == plugin->enable_ipv6)
3268 if (NULL != plugin->sockv6)
3270 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
3271 plugin->sockv6 = NULL;
3273 GNUNET_NETWORK_fdset_destroy (plugin->rs_v6);
3274 GNUNET_NETWORK_fdset_destroy (plugin->ws_v6);
3277 if (NULL != plugin->nat)
3279 GNUNET_NAT_unregister (plugin->nat);
3282 if (NULL != plugin->defrag_ctxs)
3284 GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
3285 &heap_cleanup_iterator, NULL);
3286 GNUNET_CONTAINER_heap_destroy (plugin->defrag_ctxs);
3287 plugin->defrag_ctxs = NULL;
3289 if (NULL != plugin->mst)
3291 GNUNET_SERVER_mst_destroy (plugin->mst);
3295 /* Clean up leftover messages */
3296 udpw = plugin->ipv4_queue_head;
3297 while (NULL != udpw)
3299 struct UDP_MessageWrapper *tmp = udpw->next;
3300 dequeue (plugin, udpw);
3301 call_continuation (udpw, GNUNET_SYSERR);
3305 udpw = plugin->ipv6_queue_head;
3306 while (NULL != udpw)
3308 struct UDP_MessageWrapper *tmp = udpw->next;
3309 dequeue (plugin, udpw);
3310 call_continuation (udpw, GNUNET_SYSERR);
3315 /* Clean up sessions */
3316 LOG(GNUNET_ERROR_TYPE_DEBUG,
3317 "Cleaning up sessions\n");
3318 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
3319 &disconnect_and_free_it, plugin);
3320 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
3322 next = ppc_dll_head;
3323 for (cur = next; NULL != cur; cur = next)
3326 GNUNET_CONTAINER_DLL_remove(ppc_dll_head, ppc_dll_tail, cur);
3327 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
3328 GNUNET_SCHEDULER_cancel (cur->timeout_task);
3332 GNUNET_free (plugin);
3337 /* end of plugin_transport_udp.c */