2 This file is part of GNUnet
3 (C) 2010 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, 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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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 service
24 * @author Christian Grothoff
25 * @author Nathan Evans
29 #include "gnunet_hello_lib.h"
30 #include "gnunet_connection_lib.h"
31 #include "gnunet_os_lib.h"
32 #include "gnunet_peerinfo_service.h"
33 #include "gnunet_protocols.h"
34 #include "gnunet_resolver_service.h"
35 #include "gnunet_server_lib.h"
36 #include "gnunet_service_lib.h"
37 #include "gnunet_signatures.h"
38 #include "gnunet_statistics_service.h"
39 #include "gnunet_transport_service.h"
40 #include "plugin_transport.h"
41 #include "transport.h"
43 #define DEBUG_UDP GNUNET_NO
46 * Transport cost to peer, always 1 for UDP (direct connection)
48 #define UDP_DIRECT_DISTANCE 1
51 * How long until we give up on transmitting the welcome message?
53 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
57 * Message-Packet header.
62 * size of the message, in bytes, including this header.
64 struct GNUNET_MessageHeader header;
67 * What is the identity of the sender (GNUNET_hash of public key)
69 struct GNUNET_PeerIdentity sender;
75 * Network format for IPv4 addresses.
80 * IPv4 address, in network byte order.
85 * Port number, in network byte order.
93 * Network format for IPv6 addresses.
100 unsigned char ipv6_addr[16];
103 * Port number, in network byte order.
113 struct PrettyPrinterContext
118 GNUNET_TRANSPORT_AddressStringCallback asc;
133 * Encapsulation of all of the state of the plugin.
140 struct GNUNET_TRANSPORT_PluginEnvironment *env;
143 * Handle for the statistics service.
145 struct GNUNET_STATISTICS_Handle *statistics;
148 * Handle to the network service.
150 struct GNUNET_SERVICE_Context *service;
153 * Handle for request of hostname resolution, non-NULL if pending.
155 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
160 struct GNUNET_NETWORK_FDSet *rs;
163 * ID of task used to update our addresses when one expires.
165 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
170 GNUNET_SCHEDULER_TaskIdentifier select_task;
173 * Port that we are actually listening on.
178 * Port that the user said we would have visible to the
185 /* *********** globals ************* */
188 * The socket that we transmit all data with
190 static struct GNUNET_NETWORK_Handle *udp_sock;
193 * Disconnect from a remote node.
195 * @param cls closure ('struct Plugin'), unused
196 * @param target peer do disconnect
197 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
200 udp_disconnect (void *cls,
201 const struct GNUNET_PeerIdentity *target)
203 /* nothing to do, UDP is stateless */
207 * Shutdown the server process (stop receiving inbound traffic). Maybe
210 * @param cls closure, the 'struct Plugin*'
213 udp_transport_server_stop (void *cls)
215 struct Plugin *plugin = cls;
218 GNUNET_assert (udp_sock != NULL);
219 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
221 GNUNET_SCHEDULER_cancel (plugin->env->sched, plugin->select_task);
222 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
225 ret = GNUNET_NETWORK_socket_close (udp_sock);
226 if (ret != GNUNET_SYSERR)
232 * Function that can be used by the transport service to transmit
233 * a message using the plugin.
235 * @param cls closure, the 'struct Plugin*'
236 * @param target who should receive this message (ignored by UDP)
237 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
238 * @param msgbuf_size the size of the msgbuf to send
239 * @param priority how important is the message (ignored by UDP)
240 * @param timeout when should we time out (give up) if we can not transmit?
241 * @param session which session must be used (always NULL for UDP)
242 * @param addr the addr to send the message to, needs to be a sockaddr for us
243 * @param addrlen the len of addr
244 * @param force_address GNUNET_YES if the plugin MUST use the given address,
245 * GNUNET_NO means the plugin may use any other address and
246 * GNUNET_SYSERR means that only reliable existing
247 * bi-directional connections should be used (regardless
249 * @param cont continuation to call once the message has
250 * been transmitted (or if the transport is ready
251 * for the next transmission call; or if the
252 * peer disconnected...)
253 * @param cont_cls closure for cont
255 * @return the number of bytes written, -1 on error (in this case, cont is not called)
258 udp_plugin_send (void *cls,
259 const struct GNUNET_PeerIdentity *target,
262 unsigned int priority,
263 struct GNUNET_TIME_Relative timeout,
264 struct Session *session,
268 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
270 struct Plugin *plugin = cls;
271 struct UDPMessage *message;
277 struct sockaddr_in a4;
278 struct sockaddr_in6 a6;
279 const struct IPv4UdpAddress *t4;
280 const struct IPv6UdpAddress *t6;
282 GNUNET_assert (NULL == session);
283 GNUNET_assert(udp_sock != NULL);
284 if ( (addr == NULL) || (addrlen == 0) )
287 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
288 ("udp_plugin_send called without address, returning!\n"));
290 return -1; /* Can never send if we don't have an address!! */
292 if (force_address == GNUNET_SYSERR)
293 return -1; /* never reliable */
295 if (addrlen == sizeof (struct IPv6UdpAddress))
299 memset (&a6, 0, sizeof (a6));
300 #if HAVE_SOCKADDR_IN_SIN_LEN
301 a6.sin6_len = sizeof (a6);
303 a6.sin6_family = AF_INET6;
304 a6.sin6_port = t6->u6_port;
305 memcpy (a6.sin6_addr.s6_addr,
311 else if (addrlen == sizeof (struct IPv4UdpAddress))
315 memset (&a4, 0, sizeof (a4));
316 #if HAVE_SOCKADDR_IN_SIN_LEN
317 a4.sin_len = sizeof (a4);
319 a4.sin_family = AF_INET;
320 a4.sin_port = t4->u_port;
321 a4.sin_addr.s_addr = t4->ipv4_addr;
331 /* Build the message to be sent */
332 message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
333 ssize = sizeof (struct UDPMessage) + msgbuf_size;
336 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
337 "In udp_send, ssize is %d, sending message to `%s'\n",
339 GNUNET_a2s(sb, sbs));
341 message->header.size = htons (ssize);
342 message->header.type = htons (0);
343 memcpy (&message->sender, plugin->env->my_identity,
344 sizeof (struct GNUNET_PeerIdentity));
345 memcpy (&message[1], msgbuf, msgbuf_size);
347 GNUNET_NETWORK_socket_sendto (udp_sock, message, ssize,
349 if ( (cont != NULL) &&
351 cont (cont_cls, target, GNUNET_OK);
352 GNUNET_free (message);
358 * Add the IP of our network interface to the list of
359 * our external IP addresses.
361 * @param cls closure (the 'struct Plugin*')
362 * @param name name of the interface (can be NULL for unknown)
363 * @param isDefault is this presumably the default interface
364 * @param addr address of this interface (can be NULL for unknown or unassigned)
365 * @param addrlen length of the address
366 * @return GNUNET_OK to continue iterating
369 process_interfaces (void *cls,
372 const struct sockaddr *addr, socklen_t addrlen)
374 struct Plugin *plugin = cls;
376 struct IPv4UdpAddress t4;
377 struct IPv6UdpAddress t6;
381 af = addr->sa_family;
384 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
385 t4.u_port = htons (plugin->adv_port);
389 else if (af == AF_INET6)
391 memcpy (t6.ipv6_addr,
392 ((struct sockaddr_in6 *) addr)->sin6_addr.s6_addr,
394 t6.u6_port = htons (plugin->adv_port);
403 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
404 GNUNET_ERROR_TYPE_BULK,
406 _("Found address `%s' (%s)\n"),
407 GNUNET_a2s (addr, addrlen),
409 plugin->env->notify_address (plugin->env->cls,
411 arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
417 * Function called by the resolver for each address obtained from DNS
418 * for our own hostname. Add the addresses to the list of our
419 * external IP addresses.
422 * @param addr one of the addresses of the host, NULL for the last address
423 * @param addrlen length of the address
426 process_hostname_ips (void *cls,
427 const struct sockaddr *addr, socklen_t addrlen)
429 struct Plugin *plugin = cls;
433 plugin->hostname_dns = NULL;
436 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
441 * @param cls the plugin handle
442 * @param tc the scheduling context (for rescheduling this function again)
444 * We have been notified that our writeset has something to read. Presumably
445 * select has been called already, so we can go ahead and start reading from
446 * the socket immediately. Then we check if there is more to be read by
447 * calling select ourselves while there is stuff on the wire. Then reschedule
448 * this function to be called again once more is available.
452 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
454 struct Plugin *plugin = cls;
456 struct UDPMessage *msg;
457 struct GNUNET_PeerIdentity *sender;
460 struct sockaddr_storage addr;
466 const struct GNUNET_MessageHeader *currhdr;
467 struct IPv4UdpAddress t4;
468 struct IPv6UdpAddress t6;
469 const struct sockaddr_in *s4;
470 const struct sockaddr_in6 *s6;
475 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
476 ("entered select...\n"));
479 buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock);
482 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
483 ("we expect to read %u bytes\n"), buflen);
486 if (buflen == GNUNET_NO)
489 buf = GNUNET_malloc (buflen);
490 fromlen = sizeof (addr);
492 memset (&addr, 0, fromlen);
494 GNUNET_NETWORK_socket_recvfrom (udp_sock, buf, buflen,
495 (struct sockaddr *) &addr, &fromlen);
498 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
499 ("socket_recv returned %u, src_addr_len is %u\n"), ret,
508 msg = (struct UDPMessage *) buf;
511 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
512 ("header reports message size of %d\n"),
513 ntohs (msg->header.size));
515 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
516 ("header reports message type of %d\n"),
517 ntohs (msg->header.type));
519 if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
522 GNUNET_NETWORK_fdset_zero (plugin->rs);
523 GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock);
526 msgbuf = (char *)&msg[1];
527 sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
528 memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
532 tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
534 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "UDP", _
535 ("offset is %d, tsize is %d (UDPMessage size is %d)\n"),
536 offset, tsize, sizeof(struct UDPMessage));
539 if (fromlen == sizeof (struct sockaddr_in))
541 s4 = (const struct sockaddr_in*) &addr;
542 t4.u_port = s4->sin_port;
543 t4.ipv4_addr = s4->sin_addr.s_addr;
545 calen = sizeof (struct IPv4UdpAddress);
547 else if (fromlen == sizeof (struct sockaddr_in6))
549 s6 = (const struct sockaddr_in6*) &addr;
550 t6.u6_port = s6->sin6_port;
551 memcpy (t6.ipv6_addr,
552 s6->sin6_addr.s6_addr,
555 calen = sizeof (struct IPv6UdpAddress);
563 while (offset < tsize)
565 currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
567 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
568 ("processing msg %d: type %d, size %d at offset %d\n"),
569 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
571 plugin->env->receive (plugin->env->cls,
572 sender, currhdr, UDP_DIRECT_DISTANCE,
574 offset += ntohs(currhdr->size);
576 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
577 ("offset now %d, tsize %d\n"),
583 GNUNET_free (sender);
586 plugin->select_task =
587 GNUNET_SCHEDULER_add_select (plugin->env->sched,
588 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
589 GNUNET_SCHEDULER_NO_TASK,
590 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
591 NULL, &udp_plugin_select, plugin);
596 * Create a UDP socket. If possible, use IPv6, otherwise
598 * @param cls closure, the 'struct Plugin*'
600 static struct GNUNET_NETWORK_Handle *
601 udp_transport_server_start (void *cls)
603 struct Plugin *plugin = cls;
604 struct GNUNET_NETWORK_Handle *desc;
605 struct sockaddr_in serverAddrv4;
606 struct sockaddr_in6 serverAddrv6;
607 struct sockaddr *serverAddr;
612 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
615 desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
618 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
619 #if HAVE_SOCKADDR_IN_SIN_LEN
620 serverAddrv6.sin6_len = sizeof (serverAddrv6);
622 serverAddrv6.sin6_family = AF_INET6;
623 serverAddrv6.sin6_addr = in6addr_any;
624 serverAddrv6.sin6_port = htons (plugin->open_port);
625 addrlen = sizeof (serverAddrv6);
626 serverAddr = (struct sockaddr *) &serverAddrv6;
631 desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
634 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
639 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
640 #if HAVE_SOCKADDR_IN_SIN_LEN
641 serverAddrv4.sin_len = sizeof (serverAddrv4);
643 serverAddrv4.sin_family = AF_INET;
644 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
645 serverAddrv4.sin_port = htons (plugin->open_port);
646 addrlen = sizeof (serverAddrv4);
647 serverAddr = (struct sockaddr *) &serverAddrv4;
653 GNUNET_assert (GNUNET_NETWORK_socket_bind (desc, serverAddr, addrlen) ==
657 plugin->rs = GNUNET_NETWORK_fdset_create ();
659 GNUNET_NETWORK_fdset_zero (plugin->rs);
660 GNUNET_NETWORK_fdset_set (plugin->rs, desc);
662 plugin->select_task =
663 GNUNET_SCHEDULER_add_select (plugin->env->sched,
664 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
665 GNUNET_SCHEDULER_NO_TASK,
666 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
667 NULL, &udp_plugin_select, plugin);
674 * Check if the given port is plausible (must be either
675 * our listen port or our advertised port). If it is
676 * neither, we return one of these two ports at random.
678 * @return either in_port or a more plausible port
681 check_port (struct Plugin *plugin, uint16_t in_port)
683 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
685 return (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
687 ? plugin->open_port : plugin->adv_port;
692 * Another peer has suggested an address for this peer and transport
693 * plugin. Check that this could be a valid address. This function
694 * is not expected to 'validate' the address in the sense of trying to
695 * connect to it but simply to see if the binary format is technically
696 * legal for establishing a connection.
698 * @param cls handle to Plugin
699 * @param addr address to check
700 * @param addrlen length of addr
701 * @return GNUNET_OK if this is a plausible address for this peer
702 * and transport, GNUNET_SYSERR if not
705 udp_check_address (void *cls, void *addr, size_t addrlen)
707 struct Plugin *plugin = cls;
708 struct IPv4UdpAddress *v4;
709 struct IPv6UdpAddress *v6;
711 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
712 (addrlen != sizeof (struct IPv6UdpAddress)))
715 return GNUNET_SYSERR;
717 if (addrlen == sizeof (struct IPv4UdpAddress))
719 v4 = (struct IPv4UdpAddress *) addr;
720 v4->u_port = htons (check_port (plugin, ntohs (v4->u_port)));
724 v6 = (struct IPv6UdpAddress *) addr;
725 v6->u6_port = htons (check_port (plugin, ntohs (v6->u6_port)));
732 * Append our port and forward the result.
735 append_port (void *cls, const char *hostname)
737 struct PrettyPrinterContext *ppc = cls;
740 if (hostname == NULL)
742 ppc->asc (ppc->asc_cls, NULL);
746 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
747 ppc->asc (ppc->asc_cls, ret);
753 * Convert the transports address to a nice, human-readable
757 * @param type name of the transport that generated the address
758 * @param addr one of the addresses of the host, NULL for the last address
759 * the specific address format depends on the transport
760 * @param addrlen length of the address
761 * @param numeric should (IP) addresses be displayed in numeric form?
762 * @param timeout after how long should we give up?
763 * @param asc function to call on each string
764 * @param asc_cls closure for asc
767 udp_plugin_address_pretty_printer (void *cls,
772 struct GNUNET_TIME_Relative timeout,
773 GNUNET_TRANSPORT_AddressStringCallback asc,
776 struct Plugin *plugin = cls;
777 struct PrettyPrinterContext *ppc;
779 struct sockaddr_in a4;
780 struct sockaddr_in6 a6;
781 const struct IPv4UdpAddress *t4;
782 const struct IPv6UdpAddress *t6;
787 if (addrlen == sizeof (struct IPv6UdpAddress))
791 memset (&a6, 0, sizeof (a6));
792 a6.sin6_family = AF_INET6;
793 a6.sin6_port = t6->u6_port;
794 port = ntohs (t6->u6_port);
795 memcpy (a6.sin6_addr.s6_addr,
801 else if (addrlen == sizeof (struct IPv4UdpAddress))
805 memset (&a4, 0, sizeof (a4));
806 a4.sin_family = AF_INET;
807 a4.sin_port = t4->u_port;
808 a4.sin_addr.s_addr = t4->ipv4_addr;
809 port = ntohs (t4->u_port);
815 /* invalid address */
820 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
822 ppc->asc_cls = asc_cls;
824 GNUNET_RESOLVER_hostname_get (plugin->env->sched,
828 !numeric, timeout, &append_port, ppc);
834 * Function called for a quick conversion of the binary address to
835 * a numeric address. Note that the caller must not free the
836 * address and that the next call to this function is allowed
837 * to override the address again.
840 * @param addr binary address
841 * @param addrlen length of the address
842 * @return string representing the same address
845 udp_address_to_string (void *cls,
849 static char rbuf[INET6_ADDRSTRLEN + 10];
850 char buf[INET6_ADDRSTRLEN];
854 const struct IPv4UdpAddress *t4;
855 const struct IPv6UdpAddress *t6;
859 if (addrlen == sizeof (struct IPv6UdpAddress))
863 port = ntohs (t6->u6_port);
864 memcpy (&a6, t6->ipv6_addr, sizeof (a6));
867 else if (addrlen == sizeof (struct IPv4UdpAddress))
871 port = ntohs (t4->u_port);
872 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
877 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
878 GNUNET_snprintf (rbuf,
888 * The exported method. Makes the core api available via a global and
889 * returns the udp transport API.
891 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
892 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
895 libgnunet_plugin_transport_udp_init (void *cls)
897 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
898 struct GNUNET_TRANSPORT_PluginFunctions *api;
899 struct Plugin *plugin;
900 struct GNUNET_SERVICE_Context *service;
901 unsigned long long aport;
902 unsigned long long bport;
903 unsigned long long mtu;
905 service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
908 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", _
909 ("Failed to start service for `%s' transport plugin.\n"),
915 GNUNET_CONFIGURATION_get_value_number (env->cfg,
921 GNUNET_CONFIGURATION_get_value_number (env->cfg,
924 &aport)) && (aport > 65535)))
926 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
929 ("Require valid port number for service `%s' in configuration!\n"),
931 GNUNET_SERVICE_stop (service);
939 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
941 _("MTU %llu for `%s' is probably too low!\n"), mtu,
944 plugin = GNUNET_malloc (sizeof (struct Plugin));
945 plugin->open_port = bport;
946 plugin->adv_port = aport;
948 plugin->statistics = NULL;
949 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
952 api->send = &udp_plugin_send;
953 api->disconnect = &udp_disconnect;
954 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
955 api->check_address = &udp_check_address;
956 api->address_to_string = &udp_address_to_string;
957 plugin->service = service;
959 /* FIXME: do the two calls below periodically again and
960 not just once (since the info we get might change...) */
961 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
962 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
965 HOSTNAME_RESOLVE_TIMEOUT,
966 &process_hostname_ips,
969 udp_sock = udp_transport_server_start (plugin);
971 GNUNET_assert (udp_sock != NULL);
977 libgnunet_plugin_transport_udp_done (void *cls)
979 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
980 struct Plugin *plugin = api->cls;
982 udp_transport_server_stop (plugin);
983 if (NULL != plugin->hostname_dns)
985 GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
986 plugin->hostname_dns = NULL;
988 GNUNET_SERVICE_stop (plugin->service);
990 GNUNET_NETWORK_fdset_destroy (plugin->rs);
991 GNUNET_free (plugin);
996 /* end of plugin_transport_udp.c */