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3 (C) 2010 Christian Grothoff (and other contributing authors)
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22 * @file transport/plugin_transport_udp.c
23 * @brief Implementation of the UDP NAT punching
25 * @author Christian Grothoff
26 * @author Nathan Evans
28 * The idea with this transport is to connect gnunet peers to each other
29 * when ONE is behind a NAT. This is based on pwnat (http://samy.pl/pwnat)
30 * created by Samy Kamkar. When configured with the PWNAT options, this
31 * transport will start a server daemon which sends dummy ICMP and UDP
32 * messages out to a predefined address (typically 1.2.3.4).
34 * When a non-NAT'd peer (the client) learns of the NAT'd peer (the server)
35 * address, it will send ICMP RESPONSES to the NAT'd peers external address.
36 * The NAT box should forward these faked responses to the server, which
37 * can then connect directly to the non-NAT'd peer.
41 #include "gnunet_hello_lib.h"
42 #include "gnunet_connection_lib.h"
43 #include "gnunet_container_lib.h"
44 #include "gnunet_os_lib.h"
45 #include "gnunet_peerinfo_service.h"
46 #include "gnunet_protocols.h"
47 #include "gnunet_resolver_service.h"
48 #include "gnunet_server_lib.h"
49 #include "gnunet_service_lib.h"
50 #include "gnunet_signatures.h"
51 #include "gnunet_statistics_service.h"
52 #include "gnunet_transport_service.h"
53 #include "gnunet_transport_plugin.h"
54 #include "transport.h"
56 #define DEBUG_UDP GNUNET_YES
61 * Transport cost to peer, always 1 for UDP (direct connection)
63 #define UDP_DIRECT_DISTANCE 1
65 #define DEFAULT_NAT_PORT 0
68 * How long until we give up on transmitting the welcome message?
70 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
73 * Starting port for listening and sending, eventually a config value
75 #define UDP_NAT_DEFAULT_PORT 22086
78 * UDP Message-Packet header.
85 struct GNUNET_MessageHeader header;
88 * What is the identity of the sender (GNUNET_hash of public key)
90 struct GNUNET_PeerIdentity sender;
95 * Network format for IPv4 addresses.
100 * IPv4 address, in network byte order.
102 uint32_t ipv4_addr GNUNET_PACKED;
105 * Port number, in network byte order.
107 uint16_t u_port GNUNET_PACKED;
112 * Network format for IPv6 addresses.
114 struct IPv6UdpAddress
119 struct in6_addr ipv6_addr GNUNET_PACKED;
122 * Port number, in network byte order.
124 uint16_t u6_port GNUNET_PACKED;
127 /* Forward definition */
130 struct PrettyPrinterContext
132 GNUNET_TRANSPORT_AddressStringCallback asc;
142 struct MessageQueue *next;
145 * Session this message belongs to
147 struct PeerSession *session;
150 * Actual message to be sent
155 * Size of message buffer to be sent
160 * When to discard this message
162 struct GNUNET_TIME_Absolute timeout;
165 * Continuation to call when this message goes out
167 GNUNET_TRANSPORT_TransmitContinuation cont;
170 * closure for continuation
177 * UDP NAT Probe message definition
179 struct UDP_NAT_ProbeMessage
184 struct GNUNET_MessageHeader header;
189 * UDP NAT Probe message reply definition
191 struct UDP_NAT_ProbeMessageReply
196 struct GNUNET_MessageHeader header;
202 * UDP NAT Probe message confirm definition
204 struct UDP_NAT_ProbeMessageConfirmation
209 struct GNUNET_MessageHeader header;
215 * Local network addresses (actual IP address follows this struct).
216 * PORT is NOT included!
222 * This is a doubly linked list.
224 struct LocalAddrList *next;
227 * This is a doubly linked list.
229 struct LocalAddrList *prev;
232 * Number of bytes of the address that follow
246 * Stored in a linked list.
248 struct PeerSession *next;
251 * Pointer to the global plugin struct.
253 struct Plugin *plugin;
256 * To whom are we talking to (set to our identity
257 * if we are still waiting for the welcome message)
259 struct GNUNET_PeerIdentity target;
262 * Address of the other peer (either based on our 'connect'
263 * call or on our 'accept' call).
268 * Length of connect_addr.
273 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
275 int expecting_welcome;
278 * From which socket do we need to send to this peer?
280 struct GNUNET_NETWORK_Handle *sock;
283 * Queue of messages for this peer, in the case that
284 * we have to await a connection...
286 struct MessageQueue *messages;
290 struct UDP_NAT_Probes
296 struct UDP_NAT_Probes *next;
299 * Address string that the server process returned to us
301 char *address_string;
304 * Timeout for this set of probes
306 struct GNUNET_TIME_Absolute timeout;
309 * Count of how many probes we've attempted
314 * The plugin this probe belongs to
316 struct Plugin *plugin;
319 * The task used to send these probes
321 GNUNET_SCHEDULER_TaskIdentifier task;
324 * Network address (always ipv4!)
326 struct IPv4UdpAddress addr;
332 * Information we keep for each of our listen sockets.
339 struct GNUNET_NETWORK_Handle *desc;
342 * The port we bound to
349 * Encapsulation of all of the state of the plugin.
356 struct GNUNET_TRANSPORT_PluginEnvironment *env;
359 * Handle to the network service.
361 struct GNUNET_SERVICE_Context *service;
364 * Session of peers with whom we are currently connected
366 struct PeerSession *sessions;
369 * Handle for request of hostname resolution, non-NULL if pending.
371 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
374 * ID of task used to update our addresses when one expires.
376 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
381 GNUNET_SCHEDULER_TaskIdentifier select_task;
389 * The external address given to us by the user. Must be actual
390 * outside visible address for NAT punching to work.
392 char *external_address;
395 * The internal address given to us by the user (or discovered).
397 char *internal_address;
400 * Address we were told to bind to exclusively (IPv4).
405 * Address we were told to bind to exclusively (IPv6).
410 * List of our IP addresses.
412 struct LocalAddrList *lal_head;
415 * Tail of our IP address list.
417 struct LocalAddrList *lal_tail;
422 struct GNUNET_NETWORK_FDSet *rs;
425 * stdout pipe handle for the gnunet-nat-server process
427 struct GNUNET_DISK_PipeHandle *server_stdout;
430 * stdout file handle (for reading) for the gnunet-nat-server process
432 const struct GNUNET_DISK_FileHandle *server_stdout_handle;
437 struct UDP_NAT_Probes *probes;
440 * socket that we transmit all IPv4 data with
442 struct UDP_Sock_Info udp_sockv4;
445 * socket that we transmit all IPv6 data with
447 struct UDP_Sock_Info udp_sockv6;
450 * ID of select gnunet-nat-server stdout read task
452 GNUNET_SCHEDULER_TaskIdentifier server_read_task;
455 * Is this transport configured to be behind a NAT?
460 * Is this transport configured to allow connections to NAT'd peers?
465 * Should this transport advertise only NAT addresses (port set to 0)?
466 * If not, all addresses will be duplicated for NAT punching and regular
469 int only_nat_addresses;
472 * The process id of the server process (if behind NAT)
474 struct GNUNET_OS_Process *server_proc;
480 * Forward declaration.
483 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result);
487 * Disconnect from a remote node. Clean up session if we have one for this peer
489 * @param cls closure for this call (should be handle to Plugin)
490 * @param target the peeridentity of the peer to disconnect
491 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
494 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
496 /** TODO: Implement! */
501 * Shutdown the server process (stop receiving inbound traffic). Maybe
504 * @param cls Handle to the plugin for this transport
506 * @return returns the number of sockets successfully closed,
507 * should equal the number of sockets successfully opened
510 udp_transport_server_stop (void *cls)
512 struct Plugin *plugin = cls;
514 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
516 GNUNET_SCHEDULER_cancel (plugin->select_task);
517 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
519 if (plugin->udp_sockv4.desc != NULL)
521 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->udp_sockv4.desc));
522 plugin->udp_sockv4.desc = NULL;
524 if (plugin->udp_sockv6.desc != NULL)
526 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->udp_sockv6.desc));
527 plugin->udp_sockv6.desc = NULL;
529 if (plugin->behind_nat == GNUNET_YES)
531 if (0 != GNUNET_OS_process_kill (plugin->server_proc, SIGTERM))
532 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
533 GNUNET_OS_process_wait (plugin->server_proc);
534 GNUNET_OS_process_close (plugin->server_proc);
535 plugin->server_proc = NULL;
542 find_session (struct Plugin *plugin,
543 const struct GNUNET_PeerIdentity *peer)
545 struct PeerSession *pos;
547 pos = plugin->sessions;
550 if (memcmp(&pos->target, peer, sizeof(struct GNUNET_PeerIdentity)) == 0)
560 * Actually send out the message, assume we've got the address and
561 * send_handle squared away!
564 * @param send_handle which handle to send message on
565 * @param target who should receive this message (ignored by UDP)
566 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
567 * @param msgbuf_size the size of the msgbuf to send
568 * @param priority how important is the message (ignored by UDP)
569 * @param timeout when should we time out (give up) if we can not transmit?
570 * @param addr the addr to send the message to, needs to be a sockaddr for us
571 * @param addrlen the len of addr
572 * @param cont continuation to call once the message has
573 * been transmitted (or if the transport is ready
574 * for the next transmission call; or if the
575 * peer disconnected...)
576 * @param cont_cls closure for cont
577 * @return the number of bytes written
580 udp_real_send (void *cls,
581 struct GNUNET_NETWORK_Handle *send_handle,
582 const struct GNUNET_PeerIdentity *target,
585 unsigned int priority,
586 struct GNUNET_TIME_Relative timeout,
589 GNUNET_TRANSPORT_TransmitContinuation cont,
592 struct Plugin *plugin = cls;
593 struct UDPMessage *message;
596 struct sockaddr_in a4;
597 struct sockaddr_in6 a6;
598 const struct IPv4UdpAddress *t4;
599 const struct IPv6UdpAddress *t6;
603 if (send_handle == NULL)
605 /* failed to open send socket for AF */
607 cont (cont_cls, target, GNUNET_SYSERR);
610 if ((addr == NULL) || (addrlen == 0))
613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
614 "udp_real_send called without address, returning!\n");
617 cont (cont_cls, target, GNUNET_SYSERR);
618 return 0; /* Can never send if we don't have an address!! */
621 /* Build the message to be sent */
622 message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
623 ssize = sizeof (struct UDPMessage) + msgbuf_size;
625 message->header.size = htons (ssize);
626 message->header.type = htons (0);
627 memcpy (&message->sender, plugin->env->my_identity,
628 sizeof (struct GNUNET_PeerIdentity));
629 memcpy (&message[1], msgbuf, msgbuf_size);
631 if (addrlen == sizeof (struct IPv6UdpAddress))
634 memset (&a6, 0, sizeof (a6));
635 #if HAVE_SOCKADDR_IN_SIN_LEN
636 a6.sin6_len = sizeof (a6);
638 a6.sin6_family = AF_INET6;
639 a6.sin6_port = t6->u6_port;
640 memcpy (&a6.sin6_addr,
642 sizeof (struct in6_addr));
646 else if (addrlen == sizeof (struct IPv4UdpAddress))
649 memset (&a4, 0, sizeof (a4));
650 #if HAVE_SOCKADDR_IN_SIN_LEN
651 a4.sin_len = sizeof (a4);
653 a4.sin_family = AF_INET;
654 a4.sin_port = t4->u_port;
655 a4.sin_addr.s_addr = t4->ipv4_addr;
662 GNUNET_free (message);
666 /* Actually send the message */
668 GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
671 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
672 "UDP transmit %u-byte message to %s (%d: %s)\n",
673 (unsigned int) ssize,
674 GNUNET_a2s (sb, sbs),
676 (sent < 0) ? STRERROR (errno) : "ok");
679 if (sent == GNUNET_SYSERR)
680 cont (cont_cls, target, GNUNET_SYSERR);
683 cont (cont_cls, target, GNUNET_OK);
687 GNUNET_free (message);
692 * We learned about a peer (possibly behind NAT) so run the
693 * gnunet-nat-client to send dummy ICMP responses
695 * @param plugin the plugin for this transport
696 * @param addr the address of the peer
697 * @param addrlen the length of the address
700 run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
702 char addr_buf[INET_ADDRSTRLEN];
703 char *address_as_string;
704 char *port_as_string;
705 struct GNUNET_OS_Process *proc;
706 const struct IPv4UdpAddress *t4;
708 GNUNET_assert(addrlen == sizeof(struct IPv4UdpAddress));
709 t4 = (struct IPv4UdpAddress *)addr;
711 if (NULL == inet_ntop (AF_INET,
713 addr_buf, INET_ADDRSTRLEN))
715 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
718 address_as_string = GNUNET_strdup (addr_buf);
719 GNUNET_asprintf(&port_as_string, "%d", plugin->port);
721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
722 _("Running gnunet-nat-client with arguments: %s %s %d\n"), plugin->external_address, address_as_string, plugin->port);
725 /* Start the server process */
726 proc = GNUNET_OS_start_process(NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, port_as_string, NULL);
727 GNUNET_free(address_as_string);
728 GNUNET_free(port_as_string);
729 GNUNET_OS_process_wait (proc);
730 GNUNET_OS_process_close (proc);
735 * Function that can be used by the transport service to transmit
736 * a message using the plugin.
739 * @param target who should receive this message (ignored by UDP)
740 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
741 * @param msgbuf_size the size of the msgbuf to send
742 * @param priority how important is the message (ignored by UDP)
743 * @param timeout when should we time out (give up) if we can not transmit?
744 * @param session identifier used for this session (can be NULL)
745 * @param addr the addr to send the message to, needs to be a sockaddr for us
746 * @param addrlen the len of addr
747 * @param force_address not used, we had better have an address to send to
748 * because we are stateless!!
749 * @param cont continuation to call once the message has
750 * been transmitted (or if the transport is ready
751 * for the next transmission call; or if the
752 * peer disconnected...)
753 * @param cont_cls closure for cont
755 * @return the number of bytes written (may return 0 and the message can
756 * still be transmitted later!)
759 udp_plugin_send (void *cls,
760 const struct GNUNET_PeerIdentity *target,
763 unsigned int priority,
764 struct GNUNET_TIME_Relative timeout,
765 struct Session *session,
769 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
771 struct Plugin *plugin = cls;
773 struct MessageQueue *temp_message;
774 struct PeerSession *peer_session;
776 const struct IPv4UdpAddress *t4;
778 if (force_address == GNUNET_SYSERR)
779 return GNUNET_SYSERR;
780 GNUNET_assert (NULL == session);
782 other_peer_natd = GNUNET_NO;
783 if (addrlen == sizeof(struct IPv4UdpAddress))
786 if (ntohs(t4->u_port) == 0)
787 other_peer_natd = GNUNET_YES;
789 else if (addrlen != sizeof(struct IPv6UdpAddress))
792 return -1; /* Must have an address to send to */
796 if ((other_peer_natd == GNUNET_YES) && (plugin->allow_nat == GNUNET_YES))
798 peer_session = find_session(plugin, target);
799 if (peer_session == NULL) /* We have a new peer to add */
802 * The first time, we can assume we have no knowledge of a
803 * working port for this peer, call the ICMP/UDP message sender
806 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
807 peer_session->connect_addr = GNUNET_malloc(addrlen);
808 memcpy(peer_session->connect_addr, addr, addrlen);
809 peer_session->connect_alen = addrlen;
810 peer_session->plugin = plugin;
811 peer_session->sock = NULL;
812 memcpy(&peer_session->target, target, sizeof(struct GNUNET_PeerIdentity));
813 peer_session->expecting_welcome = GNUNET_YES;
815 peer_session->next = plugin->sessions;
816 plugin->sessions = peer_session;
818 peer_session->messages = GNUNET_malloc(sizeof(struct MessageQueue));
819 peer_session->messages->msgbuf = GNUNET_malloc(msgbuf_size);
820 memcpy(peer_session->messages->msgbuf, msgbuf, msgbuf_size);
821 peer_session->messages->msgbuf_size = msgbuf_size;
822 peer_session->messages->timeout = GNUNET_TIME_relative_to_absolute(timeout);
823 peer_session->messages->cont = cont;
824 peer_session->messages->cont_cls = cont_cls;
826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
827 _("Other peer is NAT'd, set up peer session for peer %s\n"), GNUNET_i2s(target));
829 run_gnunet_nat_client(plugin, addr, addrlen);
833 if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */
835 sent = udp_real_send(cls,
840 peer_session->connect_addr, peer_session->connect_alen,
843 else /* Haven't gotten a response from this peer, queue message */
845 temp_message = GNUNET_malloc(sizeof(struct MessageQueue));
846 temp_message->msgbuf = GNUNET_malloc(msgbuf_size);
847 memcpy(temp_message->msgbuf, msgbuf, msgbuf_size);
848 temp_message->msgbuf_size = msgbuf_size;
849 temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout);
850 temp_message->cont = cont;
851 temp_message->cont_cls = cont_cls;
852 temp_message->next = peer_session->messages;
853 peer_session->messages = temp_message;
857 else if (other_peer_natd == GNUNET_NO) /* Other peer not behind a NAT, so we can just send the message as is */
859 sent = udp_real_send(cls,
860 (addrlen == sizeof (struct IPv4UdpAddress)) ? plugin->udp_sockv4.desc : plugin->udp_sockv6.desc,
863 priority, timeout, addr, addrlen,
866 else /* Other peer is NAT'd, but we don't want to play with them (or can't!) */
868 return GNUNET_SYSERR;
871 /* When GNUNET_SYSERR is returned from udp_real_send, we will still call
872 * the callback so must not return GNUNET_SYSERR!
873 * If we did, then transport context would get freed twice. */
874 if (sent == GNUNET_SYSERR)
881 add_to_address_list (struct Plugin *plugin,
885 struct LocalAddrList *lal;
887 lal = plugin->lal_head;
890 if ( (lal->size == arg_size) &&
891 (0 == memcmp (&lal[1], arg, arg_size)) )
895 lal = GNUNET_malloc (sizeof (struct LocalAddrList) + arg_size);
896 lal->size = arg_size;
897 memcpy (&lal[1], arg, arg_size);
898 GNUNET_CONTAINER_DLL_insert (plugin->lal_head,
905 check_local_addr (struct Plugin *plugin,
909 struct LocalAddrList *lal;
911 lal = plugin->lal_head;
914 if ( (lal->size == arg_size) &&
915 (0 == memcmp (&lal[1], arg, arg_size)) )
919 return GNUNET_SYSERR;
924 * Add the IP of our network interface to the list of
925 * our external IP addresses.
928 process_interfaces (void *cls,
931 const struct sockaddr *addr, socklen_t addrlen)
933 struct Plugin *plugin = cls;
935 struct IPv4UdpAddress t4;
936 struct IPv6UdpAddress t6;
940 char buf[INET6_ADDRSTRLEN];
943 af = addr->sa_family;
945 memset(buf, 0, INET6_ADDRSTRLEN);
948 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
949 GNUNET_assert(NULL != inet_ntop(AF_INET, &t4.ipv4_addr, &buf[0], INET_ADDRSTRLEN));
950 if ((plugin->bind6_address != NULL) || ((plugin->bind_address != NULL) && (0 != strcmp(buf, plugin->bind_address))))
952 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Not notifying transport of address %s\n", "UDP", GNUNET_a2s (addr, addrlen));
955 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (uint32_t));
956 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
958 t4.u_port = htons (DEFAULT_NAT_PORT);
960 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
962 addr_nat = GNUNET_malloc(sizeof(t4));
963 t4.u_port = htons (DEFAULT_NAT_PORT);
964 memcpy(addr_nat, &t4, sizeof(t4));
965 t4.u_port = plugin->port;
969 t4.u_port = htons(plugin->port);
974 else if (af == AF_INET6)
976 if (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr))
978 /* skip link local addresses */
981 memcpy (&t6.ipv6_addr,
982 &((struct sockaddr_in6 *) addr)->sin6_addr,
983 sizeof (struct in6_addr));
984 GNUNET_assert(NULL != inet_ntop(AF_INET6, &t6.ipv6_addr, &buf[0], INET6_ADDRSTRLEN));
985 if (((plugin->bind_address != NULL) && (0 != strcmp(buf, plugin->bind_address)))
986 || ((plugin->bind6_address != NULL) && (0 != strcmp(buf, plugin->bind6_address))))
988 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Not notifying transport of address %s\n", "UDP", GNUNET_a2s (addr, addrlen));
991 add_to_address_list (plugin, &t6.ipv6_addr, sizeof (struct in6_addr));
992 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
994 t6.u6_port = htons (DEFAULT_NAT_PORT);
996 else if (plugin->behind_nat == GNUNET_YES)
998 addr_nat = GNUNET_malloc(sizeof(t6));
999 t6.u6_port = htons (DEFAULT_NAT_PORT);
1000 memcpy(addr_nat, &t6, sizeof(t6));
1001 t6.u6_port = plugin->port;
1005 t6.u6_port = htons (plugin->port);
1017 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
1018 GNUNET_ERROR_TYPE_BULK,
1019 _("Found address `%s' (%s)\n"),
1020 GNUNET_a2s (addr, addrlen), name);
1022 if (addr_nat != NULL)
1024 plugin->env->notify_address (plugin->env->cls,
1026 addr_nat, args, GNUNET_TIME_UNIT_FOREVER_REL);
1027 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
1028 GNUNET_ERROR_TYPE_BULK,
1029 _("Found NAT address `%s' (%s)\n"),
1030 GNUNET_a2s (addr_nat, args), name);
1031 GNUNET_free(addr_nat);
1034 plugin->env->notify_address (plugin->env->cls,
1036 arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
1042 * Function called by the resolver for each address obtained from DNS
1043 * for our own hostname. Add the addresses to the list of our
1044 * external IP addresses.
1046 * @param cls closure
1047 * @param addr one of the addresses of the host, NULL for the last address
1048 * @param addrlen length of the address
1051 process_hostname_ips (void *cls,
1052 const struct sockaddr *addr, socklen_t addrlen)
1054 struct Plugin *plugin = cls;
1058 plugin->hostname_dns = NULL;
1061 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
1066 * Send UDP probe messages or UDP keepalive messages, depending on the
1067 * state of the connection.
1069 * @param cls closure for this call (should be the main Plugin)
1070 * @param tc task context for running this
1073 send_udp_probe_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1075 struct UDP_NAT_Probes *probe = cls;
1076 struct UDP_NAT_ProbeMessage message;
1077 struct Plugin *plugin = probe->plugin;
1079 memset (&message, 0, sizeof (message));
1080 message.header.size = htons(sizeof(struct UDP_NAT_ProbeMessage));
1081 message.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE);
1082 /* If they gave us a port, use that. If not, try our port. */
1083 if (ntohs(probe->addr.u_port) == 0)
1084 probe->addr.u_port = htons(plugin->port);
1087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1088 _("Sending a probe to port %d\n"), ntohs(probe->addr.u_port));
1091 udp_real_send(plugin,
1092 plugin->udp_sockv4.desc,
1094 (char *)&message, ntohs(message.header.size), 0,
1095 GNUNET_TIME_relative_get_unit(),
1096 &probe->addr, sizeof(struct IPv4UdpAddress),
1097 &udp_probe_continuation, probe);
1102 * Continuation for probe sends. If the last probe was sent
1103 * "successfully", schedule sending of another one. If not,
1107 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result)
1109 struct UDP_NAT_Probes *probe = cls;
1110 /*struct Plugin *plugin = probe->plugin;*/
1112 if ((result == GNUNET_OK) && (probe->count < MAX_PROBES))
1115 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1116 _("Scheduling next probe for 10000 milliseconds\n"));
1118 probe->task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 10000), &send_udp_probe_message, probe);
1120 else /* Destroy the probe context. */
1123 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1124 _("Sending probe didn't go well...\n"));
1130 * Find probe message by address
1132 * @param plugin the plugin for this transport
1133 * @param address_string the ip address as a string
1135 struct UDP_NAT_Probes *
1136 find_probe(struct Plugin *plugin, char * address_string)
1138 struct UDP_NAT_Probes *pos;
1140 pos = plugin->probes;
1142 if (strcmp(pos->address_string, address_string) == 0)
1150 * @param cls the plugin handle
1151 * @param tc the scheduling context (for rescheduling this function again)
1153 * We have been notified that gnunet-nat-server has written something to stdout.
1154 * Handle the output, then reschedule this function to be called again once
1155 * more is available.
1159 udp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1161 struct Plugin *plugin = cls;
1164 memset(&mybuf, 0, sizeof(mybuf));
1166 struct UDP_NAT_Probes *temp_probe;
1169 struct IPv4UdpAddress a4;
1171 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1174 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
1179 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1180 _("Finished reading from server stdout with code: %d\n"), bytes);
1186 for (i = 0; i < sizeof(mybuf); i++)
1188 if (mybuf[i] == '\n')
1191 if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
1194 port_start = &mybuf[i + 1];
1198 if (port_start != NULL)
1199 port = atoi(port_start);
1202 plugin->server_read_task =
1203 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1204 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1210 _("nat-server-read read: %s port %d\n"), &mybuf, port);
1214 * We have received an ICMP response, ostensibly from a non-NAT'd peer
1215 * that wants to connect to us! Send a message to establish a connection.
1217 if (inet_pton(AF_INET, &mybuf[0], &a4.ipv4_addr) != 1)
1220 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1221 _("nat-server-read malformed address\n"), &mybuf, port);
1223 plugin->server_read_task =
1224 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1225 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1229 temp_probe = find_probe(plugin, &mybuf[0]);
1231 if (temp_probe == NULL)
1233 temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes));
1234 temp_probe->address_string = strdup(&mybuf[0]);
1235 GNUNET_assert (1 == inet_pton(AF_INET, &mybuf[0], &temp_probe->addr.ipv4_addr));
1236 temp_probe->addr.u_port = htons(port);
1237 temp_probe->next = plugin->probes;
1238 temp_probe->plugin = plugin;
1239 temp_probe->task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 500), &send_udp_probe_message, temp_probe);
1240 plugin->probes = temp_probe;
1243 plugin->server_read_task =
1244 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1245 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1251 * Demultiplexer for UDP NAT messages
1253 * @param plugin the main plugin for this transport
1254 * @param sender from which peer the message was received
1255 * @param currhdr pointer to the header of the message
1256 * @param sender_addr the address from which the message was received
1257 * @param fromlen the length of the address
1258 * @param sockinfo which socket did we receive the message on
1261 udp_demultiplexer(struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
1262 const struct GNUNET_MessageHeader *currhdr,
1263 const void *sender_addr,
1264 size_t fromlen, struct UDP_Sock_Info *sockinfo)
1266 struct UDP_NAT_ProbeMessageReply *outgoing_probe_reply;
1267 struct UDP_NAT_ProbeMessageConfirmation *outgoing_probe_confirmation;
1269 char addr_buf[INET_ADDRSTRLEN];
1270 struct UDP_NAT_Probes *outgoing_probe;
1271 struct PeerSession *peer_session;
1272 struct MessageQueue *pending_message;
1273 struct MessageQueue *pending_message_temp;
1274 uint16_t incoming_port;
1276 if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
1279 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1280 _("Received a message from myself, dropping!!!\n"));
1286 GNUNET_assert(sender_addr != NULL); /* Can recvfrom have a NULL address? */
1287 if (fromlen == sizeof(struct IPv4UdpAddress))
1289 incoming_port = ntohs(((struct IPv4UdpAddress *)sender_addr)->u_port);
1291 else if (fromlen == sizeof(struct IPv6UdpAddress))
1293 incoming_port = ntohs(((struct IPv6UdpAddress *)sender_addr)->u6_port);
1296 switch (ntohs(currhdr->type))
1298 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE:
1299 /* Send probe reply */
1300 outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply));
1301 outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply));
1302 outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY);
1305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1306 _("Received a probe on listen port %d, sent_from port %d\n"),
1307 sockinfo->port, incoming_port);
1310 udp_real_send(plugin, sockinfo->desc, NULL,
1311 (char *)outgoing_probe_reply,
1312 ntohs(outgoing_probe_reply->header.size), 0,
1313 GNUNET_TIME_relative_get_unit(),
1314 sender_addr, fromlen,
1318 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1319 _("Sent PROBE REPLY to port %d on outgoing port %d\n"),
1320 incoming_port, sockinfo->port);
1322 GNUNET_free(outgoing_probe_reply);
1324 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY:
1325 /* Check for existing probe, check ports returned, send confirmation if all is well */
1327 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1328 _("Received PROBE REPLY from port %d on incoming port %d\n"), incoming_port, sockinfo->port);
1330 if (fromlen == sizeof(struct IPv4UdpAddress))
1332 memset(&addr_buf, 0, sizeof(addr_buf));
1333 if (NULL == inet_ntop (AF_INET,
1334 &((struct IPv4UdpAddress *) sender_addr)->ipv4_addr, addr_buf,
1337 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
1340 outgoing_probe = find_probe(plugin, &addr_buf[0]);
1341 if (outgoing_probe != NULL)
1344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1345 _("Sending confirmation that we were reached!\n"));
1347 outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1348 outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1349 outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM);
1350 udp_real_send(plugin, sockinfo->desc, NULL,
1351 (char *)outgoing_probe_confirmation,
1352 ntohs(outgoing_probe_confirmation->header.size), 0,
1353 GNUNET_TIME_relative_get_unit(),
1354 sender_addr, fromlen, NULL, NULL);
1356 if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK)
1358 GNUNET_SCHEDULER_cancel(outgoing_probe->task);
1359 outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK;
1360 /* Schedule task to timeout and remove probe if confirmation not received */
1362 GNUNET_free(outgoing_probe_confirmation);
1367 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1368 _("Received a probe reply, but have no record of a sent probe!\n"));
1375 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1376 _("Received a probe reply, but sender address size is WRONG (should be %d, is %d)!\n"), sizeof(struct IPv4UdpAddress), fromlen);
1380 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM:
1381 peer_session = find_session(plugin, sender);
1383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1384 _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
1386 if (peer_session == NULL) /* Shouldn't this NOT happen? */
1389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1390 _("Peer not in list, adding (THIS MAY BE A MISTAKE) %s\n"), GNUNET_i2s(sender));
1392 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
1393 peer_session->connect_addr = GNUNET_malloc(fromlen);
1394 memcpy(peer_session->connect_addr, sender_addr, fromlen);
1395 peer_session->connect_alen = fromlen;
1396 peer_session->plugin = plugin;
1397 peer_session->sock = sockinfo->desc;
1398 memcpy(&peer_session->target, sender, sizeof(struct GNUNET_PeerIdentity));
1399 peer_session->expecting_welcome = GNUNET_NO;
1401 peer_session->next = plugin->sessions;
1402 plugin->sessions = peer_session;
1404 peer_session->messages = NULL;
1406 else if (peer_session->expecting_welcome == GNUNET_YES)
1408 peer_session->expecting_welcome = GNUNET_NO;
1409 peer_session->sock = sockinfo->desc;
1410 if (peer_session->connect_alen == sizeof(struct IPv4UdpAddress))
1412 ((struct IPv4UdpAddress *)peer_session->connect_addr)->u_port = htons(incoming_port);
1414 else if (peer_session->connect_alen == sizeof(struct IPv4UdpAddress))
1416 ((struct IPv6UdpAddress *)peer_session->connect_addr)->u6_port = htons(incoming_port);
1420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1421 _("Received a probe confirmation, will send to peer on port %d\n"), incoming_port);
1423 if (peer_session->messages != NULL)
1426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1427 _("Received a probe confirmation, sending queued messages.\n"));
1429 pending_message = peer_session->messages;
1431 while (pending_message != NULL)
1434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1435 _("sending queued message %d\n"), count);
1437 udp_real_send(plugin,
1439 &peer_session->target,
1440 pending_message->msgbuf,
1441 pending_message->msgbuf_size, 0,
1442 GNUNET_TIME_relative_get_unit(),
1443 peer_session->connect_addr,
1444 peer_session->connect_alen,
1445 pending_message->cont,
1446 pending_message->cont_cls);
1448 pending_message_temp = pending_message;
1449 pending_message = pending_message->next;
1450 GNUNET_free(pending_message_temp->msgbuf);
1451 GNUNET_free(pending_message_temp);
1453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1454 _("finished sending queued message %d\n"), count);
1464 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1465 _("Received probe confirmation for already confirmed peer!\n"));
1468 /* Received confirmation, add peer with address/port specified */
1470 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE:
1471 /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */
1472 /* If we receive these just ignore! */
1476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1477 "Sending message type %d to transport!\n",
1478 ntohs(currhdr->type));
1480 plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE,
1481 NULL, sender_addr, fromlen);
1488 * @param cls the plugin handle
1489 * @param tc the scheduling context (for rescheduling this function again)
1491 * We have been notified that our writeset has something to read. We don't
1492 * know which socket needs to be read, so we have to check each one
1493 * Then reschedule this function to be called again once more is available.
1497 udp_plugin_select (void *cls,
1498 const struct GNUNET_SCHEDULER_TaskContext *tc)
1500 struct Plugin *plugin = cls;
1502 struct UDPMessage *msg;
1503 struct GNUNET_PeerIdentity sender;
1511 const struct GNUNET_MessageHeader *currhdr;
1512 struct IPv4UdpAddress t4;
1513 struct IPv6UdpAddress t6;
1514 const struct sockaddr_in *s4;
1515 const struct sockaddr_in6 *s6;
1518 struct UDP_Sock_Info *udp_sock;
1520 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1521 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1524 if (GNUNET_NETWORK_fdset_isset (tc->read_ready,
1525 plugin->udp_sockv4.desc))
1526 udp_sock = &plugin->udp_sockv4;
1527 else if (GNUNET_NETWORK_fdset_isset (tc->read_ready,
1528 plugin->udp_sockv6.desc))
1529 udp_sock = &plugin->udp_sockv6;
1530 if (NULL == udp_sock)
1535 fromlen = sizeof (addr);
1536 memset (&addr, 0, sizeof(addr));
1538 GNUNET_NETWORK_socket_recvfrom (udp_sock->desc, buf, sizeof (buf),
1539 (struct sockaddr *)&addr, &fromlen);
1541 if (AF_INET == ((struct sockaddr *)addr)->sa_family)
1543 s4 = (const struct sockaddr_in*) &addr;
1544 t4.u_port = s4->sin_port;
1545 t4.ipv4_addr = s4->sin_addr.s_addr;
1547 calen = sizeof (t4);
1549 else if (AF_INET6 == ((struct sockaddr *)addr)->sa_family)
1551 s6 = (const struct sockaddr_in6*) &addr;
1552 t6.u6_port = s6->sin6_port;
1553 memcpy (&t6.ipv6_addr,
1555 sizeof (struct in6_addr));
1557 calen = sizeof (t6);
1565 if (ret < sizeof (struct UDPMessage))
1567 GNUNET_break_op (0);
1568 plugin->select_task =
1569 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1570 GNUNET_SCHEDULER_NO_TASK,
1571 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1572 NULL, &udp_plugin_select, plugin);
1575 msg = (struct UDPMessage *) buf;
1576 if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
1578 GNUNET_break_op (0);
1579 plugin->select_task =
1580 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1581 GNUNET_SCHEDULER_NO_TASK,
1582 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1583 NULL, &udp_plugin_select, plugin);
1586 msgbuf = (char *)&msg[1];
1587 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1590 tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
1591 while (offset < tsize)
1593 currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
1594 udp_demultiplexer(plugin, &sender, currhdr, ca, calen, udp_sock);
1595 offset += ntohs(currhdr->size);
1598 plugin->select_task =
1599 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1600 GNUNET_SCHEDULER_NO_TASK,
1601 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1602 NULL, &udp_plugin_select, plugin);
1607 * Create a slew of UDP sockets. If possible, use IPv6 and IPv4.
1609 * @param cls closure for server start, should be a struct Plugin *
1610 * @return number of sockets created or GNUNET_SYSERR on error
1613 udp_transport_server_start (void *cls)
1615 struct Plugin *plugin = cls;
1616 struct sockaddr_in serverAddrv4;
1617 struct sockaddr_in6 serverAddrv6;
1618 struct sockaddr *serverAddr;
1620 int sockets_created;
1624 sockets_created = 0;
1625 if (plugin->behind_nat == GNUNET_YES)
1627 /* Pipe to read from started processes stdout (on read end) */
1628 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES, GNUNET_NO, GNUNET_YES);
1629 if (plugin->server_stdout == NULL)
1630 return sockets_created;
1632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1633 "Starting gnunet-nat-server process cmd: %s %s\n",
1634 "gnunet-nat-server",
1635 plugin->internal_address);
1637 /* Start the server process */
1638 plugin->server_proc = GNUNET_OS_start_process(NULL,
1639 plugin->server_stdout,
1640 "gnunet-nat-server",
1641 "gnunet-nat-server",
1642 plugin->internal_address, NULL);
1643 if (plugin->server_proc == NULL)
1646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1647 "Failed to start gnunet-nat-server process\n");
1649 return GNUNET_SYSERR;
1651 /* Close the write end of the read pipe */
1652 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
1654 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
1655 plugin->server_read_task =
1656 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1657 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1661 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "transport-udp",
1664 plugin->udp_sockv6.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1665 if (NULL == plugin->udp_sockv6.desc)
1667 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
1671 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1672 #if HAVE_SOCKADDR_IN_SIN_LEN
1673 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1676 serverAddrv6.sin6_family = AF_INET6;
1677 serverAddrv6.sin6_addr = in6addr_any;
1678 if (plugin->bind6_address != NULL)
1680 if (1 != inet_pton(AF_INET6, plugin->bind6_address, &serverAddrv6.sin6_addr))
1684 serverAddrv6.sin6_port = htons (plugin->port);
1685 addrlen = sizeof (serverAddrv6);
1686 serverAddr = (struct sockaddr *) &serverAddrv6;
1688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1689 "Binding to IPv6 port %d\n",
1690 ntohs(serverAddrv6.sin6_port));
1693 while (GNUNET_NETWORK_socket_bind (plugin->udp_sockv6.desc, serverAddr, addrlen) !=
1696 serverAddrv6.sin6_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1698 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1699 "IPv6 Binding failed, trying new port %d\n",
1700 ntohs(serverAddrv6.sin6_port));
1705 GNUNET_NETWORK_socket_close (plugin->udp_sockv6.desc);
1706 plugin->udp_sockv6.desc = NULL;
1710 if (plugin->udp_sockv6.desc != NULL)
1712 plugin->udp_sockv6.port = ntohs(serverAddrv6.sin6_port);
1718 plugin->udp_sockv4.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1719 if (NULL == plugin->udp_sockv4.desc)
1721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "socket");
1725 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1726 #if HAVE_SOCKADDR_IN_SIN_LEN
1727 serverAddrv4.sin_len = sizeof (serverAddrv4);
1729 serverAddrv4.sin_family = AF_INET;
1730 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1731 if (plugin->bind_address != NULL)
1733 if (1 != inet_pton(AF_INET, plugin->bind_address, &serverAddrv4.sin_addr))
1736 serverAddrv4.sin_port = htons (plugin->port);
1737 addrlen = sizeof (serverAddrv4);
1738 serverAddr = (struct sockaddr *) &serverAddrv4;
1740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1741 "Binding to IPv4 port %d\n",
1742 ntohs(serverAddrv4.sin_port));
1745 while (GNUNET_NETWORK_socket_bind (plugin->udp_sockv4.desc, serverAddr, addrlen) !=
1748 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1751 "IPv4 Binding failed, trying new port %d\n",
1752 ntohs(serverAddrv4.sin_port));
1757 GNUNET_NETWORK_socket_close (plugin->udp_sockv4.desc);
1758 plugin->udp_sockv4.desc = NULL;
1762 if (plugin->udp_sockv4.desc != NULL)
1764 plugin->udp_sockv4.port = ntohs(serverAddrv4.sin_port);
1769 plugin->rs = GNUNET_NETWORK_fdset_create ();
1770 GNUNET_NETWORK_fdset_zero (plugin->rs);
1771 if (NULL != plugin->udp_sockv4.desc)
1772 GNUNET_NETWORK_fdset_set (plugin->rs,
1773 plugin->udp_sockv4.desc);
1774 if (NULL != plugin->udp_sockv6.desc)
1775 GNUNET_NETWORK_fdset_set (plugin->rs,
1776 plugin->udp_sockv6.desc);
1778 plugin->select_task =
1779 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1780 GNUNET_SCHEDULER_NO_TASK,
1781 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1782 NULL, &udp_plugin_select, plugin);
1783 return sockets_created;
1789 * Check if the given port is plausible (must be either
1790 * our listen port or our advertised port). If it is
1791 * neither, we return GNUNET_SYSERR.
1793 * @param plugin global variables
1794 * @param in_port port number to check
1795 * @return GNUNET_OK if port is either open_port or adv_port
1798 check_port (struct Plugin *plugin, uint16_t in_port)
1800 if ( (plugin->behind_nat == GNUNET_YES) && (in_port == 0) )
1802 if ( (plugin->only_nat_addresses == GNUNET_YES) &&
1803 (plugin->behind_nat == GNUNET_YES) )
1804 return GNUNET_SYSERR; /* odd case... */
1805 if (in_port == plugin->port)
1807 return GNUNET_SYSERR;
1812 * Function that will be called to check if a binary address for this
1813 * plugin is well-formed and corresponds to an address for THIS peer
1814 * (as per our configuration). Naturally, if absolutely necessary,
1815 * plugins can be a bit conservative in their answer, but in general
1816 * plugins should make sure that the address does not redirect
1817 * traffic to a 3rd party that might try to man-in-the-middle our
1820 * @param cls closure, should be our handle to the Plugin
1821 * @param addr pointer to the address
1822 * @param addrlen length of addr
1823 * @return GNUNET_OK if this is a plausible address for this peer
1824 * and transport, GNUNET_SYSERR if not
1828 udp_check_address (void *cls,
1832 struct Plugin *plugin = cls;
1833 char buf[INET6_ADDRSTRLEN];
1839 struct IPv4UdpAddress *v4;
1840 struct IPv6UdpAddress *v6;
1842 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
1843 (addrlen != sizeof (struct IPv6UdpAddress)))
1845 GNUNET_break_op (0);
1846 return GNUNET_SYSERR;
1849 if (addrlen == sizeof (struct IPv4UdpAddress))
1851 v4 = (struct IPv4UdpAddress *) addr;
1853 check_port (plugin, ntohs (v4->u_port)))
1854 return GNUNET_SYSERR;
1856 check_local_addr (plugin, &v4->ipv4_addr, sizeof (uint32_t)))
1857 return GNUNET_SYSERR;
1860 port = ntohs (v4->u_port);
1861 memcpy (&a4, &v4->ipv4_addr, sizeof (a4));
1866 v6 = (struct IPv6UdpAddress *) addr;
1867 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1869 GNUNET_break_op (0);
1870 return GNUNET_SYSERR;
1873 check_port (plugin, ntohs (v6->u6_port)))
1874 return GNUNET_SYSERR;
1876 check_local_addr (plugin, &v6->ipv6_addr, sizeof (struct in6_addr)))
1877 return GNUNET_SYSERR;
1880 port = ntohs (v6->u6_port);
1881 memcpy (&a6, &v6->ipv6_addr, sizeof (a6));
1885 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
1888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1889 "Informing transport service about my address `%s:%u'\n",
1898 * Append our port and forward the result.
1901 append_port (void *cls, const char *hostname)
1903 struct PrettyPrinterContext *ppc = cls;
1906 if (hostname == NULL)
1908 ppc->asc (ppc->asc_cls, NULL);
1912 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1913 ppc->asc (ppc->asc_cls, ret);
1919 * Convert the transports address to a nice, human-readable
1922 * @param cls closure
1923 * @param type name of the transport that generated the address
1924 * @param addr one of the addresses of the host, NULL for the last address
1925 * the specific address format depends on the transport
1926 * @param addrlen length of the address
1927 * @param numeric should (IP) addresses be displayed in numeric form?
1928 * @param timeout after how long should we give up?
1929 * @param asc function to call on each string
1930 * @param asc_cls closure for asc
1933 udp_plugin_address_pretty_printer (void *cls,
1938 struct GNUNET_TIME_Relative timeout,
1939 GNUNET_TRANSPORT_AddressStringCallback asc,
1942 struct Plugin *plugin = cls;
1943 struct PrettyPrinterContext *ppc;
1946 struct sockaddr_in a4;
1947 struct sockaddr_in6 a6;
1948 const struct IPv4UdpAddress *u4;
1949 const struct IPv6UdpAddress *u6;
1952 if (addrlen == sizeof (struct IPv6UdpAddress))
1955 memset (&a6, 0, sizeof (a6));
1956 a6.sin6_family = AF_INET6;
1957 a6.sin6_port = u6->u6_port;
1958 memcpy (&a6.sin6_addr,
1960 sizeof (struct in6_addr));
1961 port = ntohs (u6->u6_port);
1965 else if (addrlen == sizeof (struct IPv4UdpAddress))
1968 memset (&a4, 0, sizeof (a4));
1969 a4.sin_family = AF_INET;
1970 a4.sin_port = u4->u_port;
1971 a4.sin_addr.s_addr = u4->ipv4_addr;
1972 port = ntohs (u4->u_port);
1978 /* invalid address */
1979 GNUNET_break_op (0);
1980 asc (asc_cls, NULL);
1983 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1985 ppc->asc_cls = asc_cls;
1987 GNUNET_RESOLVER_hostname_get (plugin->env->cfg,
1990 !numeric, timeout, &append_port, ppc);
1994 * Return the actual path to a file found in the current
1995 * PATH environment variable.
1997 * @param binary the name of the file to find
2000 get_path_from_PATH (char *binary)
2008 p = getenv ("PATH");
2011 path = GNUNET_strdup (p); /* because we write on it */
2012 buf = GNUNET_malloc (strlen (path) + 20);
2015 while (NULL != (end = strchr (pos, PATH_SEPARATOR)))
2018 sprintf (buf, "%s/%s", pos, binary);
2019 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2026 sprintf (buf, "%s/%s", pos, binary);
2027 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2038 * Check whether the suid bit is set on a file.
2039 * Attempts to find the file using the current
2040 * PATH environment variable as a search path.
2042 * @param binary the name of the file to check
2045 check_gnunet_nat_binary(char *binary)
2047 struct stat statbuf;
2055 GNUNET_asprintf (&binaryexe, "%s.exe", binary);
2056 p = get_path_from_PATH (binaryexe);
2059 p = get_path_from_PATH (binary);
2063 if (0 != STAT (p, &statbuf))
2066 return GNUNET_SYSERR;
2070 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
2071 (statbuf.st_uid == 0) )
2075 rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
2076 if (INVALID_SOCKET == rawsock)
2078 DWORD err = GetLastError ();
2079 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "socket (AF_INET, SOCK_RAW, IPPROTO_ICMP) have failed! GLE = %d\n", err);
2080 return GNUNET_NO; /* not running as administrator */
2082 closesocket (rawsock);
2088 * Function called for a quick conversion of the binary address to
2089 * a numeric address. Note that the caller must not free the
2090 * address and that the next call to this function is allowed
2091 * to override the address again.
2093 * @param cls closure
2094 * @param addr binary address
2095 * @param addrlen length of the address
2096 * @return string representing the same address
2099 udp_address_to_string (void *cls,
2103 static char rbuf[INET6_ADDRSTRLEN + 10];
2104 char buf[INET6_ADDRSTRLEN];
2108 const struct IPv4UdpAddress *t4;
2109 const struct IPv6UdpAddress *t6;
2113 if (addrlen == sizeof (struct IPv6UdpAddress))
2117 port = ntohs (t6->u6_port);
2118 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
2121 else if (addrlen == sizeof (struct IPv4UdpAddress))
2125 port = ntohs (t4->u_port);
2126 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
2131 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
2132 GNUNET_snprintf (rbuf,
2141 * The exported method. Makes the core api available via a global and
2142 * returns the udp transport API.
2145 libgnunet_plugin_transport_udp_init (void *cls)
2147 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2148 unsigned long long mtu;
2149 unsigned long long port;
2150 struct GNUNET_TRANSPORT_PluginFunctions *api;
2151 struct Plugin *plugin;
2152 struct GNUNET_SERVICE_Context *service;
2153 int sockets_created;
2156 int only_nat_addresses;
2157 char *internal_address;
2158 char *external_address;
2159 struct IPv4UdpAddress v4_address;
2161 service = GNUNET_SERVICE_start ("transport-udp", env->cfg);
2162 if (service == NULL)
2164 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _
2165 ("Failed to start service for `%s' transport plugin.\n"),
2170 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2174 /* We are behind nat (according to the user) */
2175 if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
2176 behind_nat = GNUNET_YES;
2179 behind_nat = GNUNET_NO;
2180 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Configuration specified you are behind a NAT, but gnunet-nat-server is not installed properly (suid bit not set)!\n");
2184 behind_nat = GNUNET_NO; /* We are not behind nat! */
2186 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2190 if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
2191 allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
2194 allow_nat = GNUNET_NO;
2195 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Configuration specified you want to connect to NAT'd peers, but gnunet-nat-client is not installed properly (suid bit not set)!\n");
2200 allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
2202 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2204 "ONLY_NAT_ADDRESSES"))
2205 only_nat_addresses = GNUNET_YES; /* We will only report our addresses as NAT'd */
2207 only_nat_addresses = GNUNET_NO; /* We will report our addresses as NAT'd and non-NAT'd */
2209 external_address = NULL;
2210 if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
2211 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2214 &external_address)))
2216 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2217 _("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
2219 GNUNET_SERVICE_stop (service);
2223 if ((external_address != NULL) && (inet_pton(AF_INET, external_address, &v4_address.ipv4_addr) != 1))
2225 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Malformed EXTERNAL_ADDRESS %s given in configuration!\n", external_address);
2228 internal_address = NULL;
2229 if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
2230 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2233 &internal_address)))
2235 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2236 _("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
2238 GNUNET_SERVICE_stop (service);
2239 GNUNET_free_non_null(external_address);
2243 if ((internal_address != NULL) && (inet_pton(AF_INET, internal_address, &v4_address.ipv4_addr) != 1))
2245 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Malformed INTERNAL_ADDRESS %s given in configuration!\n", internal_address);
2249 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2253 port = UDP_NAT_DEFAULT_PORT;
2254 else if (port > 65535)
2256 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2257 _("Given `%s' option is out of range: %llu > %u\n"),
2261 GNUNET_SERVICE_stop (service);
2262 GNUNET_free_non_null(external_address);
2263 GNUNET_free_non_null(internal_address);
2269 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2270 _("MTU %llu for `%s' is probably too low!\n"), mtu,
2273 plugin = GNUNET_malloc (sizeof (struct Plugin));
2274 plugin->external_address = external_address;
2275 plugin->internal_address = internal_address;
2276 plugin->port = port;
2277 plugin->behind_nat = behind_nat;
2278 plugin->allow_nat = allow_nat;
2279 plugin->only_nat_addresses = only_nat_addresses;
2282 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2285 api->send = &udp_plugin_send;
2286 api->disconnect = &udp_disconnect;
2287 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2288 api->address_to_string = &udp_address_to_string;
2289 api->check_address = &udp_check_address;
2291 plugin->service = service;
2293 GNUNET_CONFIGURATION_get_value_string(env->cfg, "transport-udp", "BINDTO", &plugin->bind_address);
2295 GNUNET_CONFIGURATION_get_value_string(env->cfg, "transport-udp", "BINDTO6", &plugin->bind6_address);
2297 if (plugin->behind_nat == GNUNET_NO)
2299 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
2302 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->cfg,
2304 HOSTNAME_RESOLVE_TIMEOUT,
2305 &process_hostname_ips,
2308 if ((plugin->behind_nat == GNUNET_YES) && (inet_pton(AF_INET, plugin->external_address, &v4_address.ipv4_addr) == 1))
2310 v4_address.u_port = htons(0);
2311 plugin->env->notify_address (plugin->env->cls,
2313 &v4_address, sizeof(v4_address), GNUNET_TIME_UNIT_FOREVER_REL);
2314 add_to_address_list (plugin, &v4_address.ipv4_addr, sizeof (uint32_t));
2315 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Notifying plugin of address %s:0\n", plugin->external_address);
2317 else if ((plugin->external_address != NULL) && (inet_pton(AF_INET, plugin->external_address, &v4_address.ipv4_addr) == 1))
2319 v4_address.u_port = htons(plugin->port);
2320 plugin->env->notify_address (plugin->env->cls,
2322 &v4_address, sizeof(v4_address), GNUNET_TIME_UNIT_FOREVER_REL);
2323 add_to_address_list (plugin, &v4_address.ipv4_addr, sizeof (uint32_t));
2326 sockets_created = udp_transport_server_start (plugin);
2327 if (sockets_created == 0)
2328 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2329 _("Failed to open UDP sockets\n"));
2334 libgnunet_plugin_transport_udp_done (void *cls)
2336 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2337 struct Plugin *plugin = api->cls;
2338 struct LocalAddrList *lal;
2340 udp_transport_server_stop (plugin);
2341 if (NULL != plugin->hostname_dns)
2343 GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
2344 plugin->hostname_dns = NULL;
2347 GNUNET_SERVICE_stop (plugin->service);
2349 GNUNET_NETWORK_fdset_destroy (plugin->rs);
2350 while (NULL != (lal = plugin->lal_head))
2352 GNUNET_CONTAINER_DLL_remove (plugin->lal_head,
2357 GNUNET_free (plugin);
2362 /* end of plugin_transport_udp.c */