2 This file is part of GNUnet
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_signatures.h"
50 #include "gnunet_statistics_service.h"
51 #include "gnunet_transport_service.h"
52 #include "gnunet_transport_plugin.h"
53 #include "transport.h"
55 #define DEBUG_UDP GNUNET_YES
60 * Transport cost to peer, always 1 for UDP (direct connection)
62 #define UDP_DIRECT_DISTANCE 1
64 #define DEFAULT_NAT_PORT 0
67 * How long until we give up on transmitting the welcome message?
69 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
72 * Starting port for listening and sending, eventually a config value
74 #define UDP_NAT_DEFAULT_PORT 22086
77 * UDP Message-Packet header.
84 struct GNUNET_MessageHeader header;
87 * What is the identity of the sender (GNUNET_hash of public key)
89 struct GNUNET_PeerIdentity sender;
94 * Network format for IPv4 addresses.
99 * IPv4 address, in network byte order.
101 uint32_t ipv4_addr GNUNET_PACKED;
104 * Port number, in network byte order.
106 uint16_t u_port GNUNET_PACKED;
111 * Network format for IPv6 addresses.
113 struct IPv6UdpAddress
118 struct in6_addr ipv6_addr GNUNET_PACKED;
121 * Port number, in network byte order.
123 uint16_t u6_port GNUNET_PACKED;
126 /* Forward definition */
129 struct PrettyPrinterContext
131 GNUNET_TRANSPORT_AddressStringCallback asc;
141 struct MessageQueue *next;
144 * Session this message belongs to
146 struct PeerSession *session;
149 * Actual message to be sent
154 * Size of message buffer to be sent
159 * When to discard this message
161 struct GNUNET_TIME_Absolute timeout;
164 * Continuation to call when this message goes out
166 GNUNET_TRANSPORT_TransmitContinuation cont;
169 * closure for continuation
176 * UDP NAT Probe message definition
178 struct UDP_NAT_ProbeMessage
183 struct GNUNET_MessageHeader header;
188 * UDP NAT Probe message reply definition
190 struct UDP_NAT_ProbeMessageReply
195 struct GNUNET_MessageHeader header;
201 * UDP NAT Probe message confirm definition
203 struct UDP_NAT_ProbeMessageConfirmation
208 struct GNUNET_MessageHeader header;
214 * Local network addresses (actual IP address follows this struct).
215 * PORT is NOT included!
221 * This is a doubly linked list.
223 struct LocalAddrList *next;
226 * This is a doubly linked list.
228 struct LocalAddrList *prev;
231 * Number of bytes of the address that follow
245 * Stored in a linked list.
247 struct PeerSession *next;
250 * Pointer to the global plugin struct.
252 struct Plugin *plugin;
255 * To whom are we talking to (set to our identity
256 * if we are still waiting for the welcome message)
258 struct GNUNET_PeerIdentity target;
261 * Address of the other peer (either based on our 'connect'
262 * call or on our 'accept' call).
267 * Length of connect_addr.
272 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
274 int expecting_welcome;
277 * From which socket do we need to send to this peer?
279 struct GNUNET_NETWORK_Handle *sock;
282 * Queue of messages for this peer, in the case that
283 * we have to await a connection...
285 struct MessageQueue *messages;
289 struct UDP_NAT_Probes
295 struct UDP_NAT_Probes *next;
298 * Address string that the server process returned to us
300 char *address_string;
303 * Timeout for this set of probes
305 struct GNUNET_TIME_Absolute timeout;
308 * Count of how many probes we've attempted
313 * The plugin this probe belongs to
315 struct Plugin *plugin;
318 * The task used to send these probes
320 GNUNET_SCHEDULER_TaskIdentifier task;
323 * Network address (always ipv4!)
325 struct IPv4UdpAddress addr;
331 * Information we keep for each of our listen sockets.
338 struct GNUNET_NETWORK_Handle *desc;
341 * The port we bound to
348 * Encapsulation of all of the state of the plugin.
355 struct GNUNET_TRANSPORT_PluginEnvironment *env;
358 * Session of peers with whom we are currently connected
360 struct PeerSession *sessions;
363 * Handle for request of hostname resolution, non-NULL if pending.
365 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
368 * ID of task used to update our addresses when one expires.
370 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
375 GNUNET_SCHEDULER_TaskIdentifier select_task;
383 * The external address given to us by the user. Must be actual
384 * outside visible address for NAT punching to work.
386 char *external_address;
389 * The internal address given to us by the user (or discovered).
391 char *internal_address;
394 * Address we were told to bind to exclusively (IPv4).
399 * Address we were told to bind to exclusively (IPv6).
404 * List of our IP addresses.
406 struct LocalAddrList *lal_head;
409 * Tail of our IP address list.
411 struct LocalAddrList *lal_tail;
416 struct GNUNET_NETWORK_FDSet *rs;
419 * stdout pipe handle for the gnunet-nat-server process
421 struct GNUNET_DISK_PipeHandle *server_stdout;
424 * stdout file handle (for reading) for the gnunet-nat-server process
426 const struct GNUNET_DISK_FileHandle *server_stdout_handle;
431 struct UDP_NAT_Probes *probes;
434 * socket that we transmit all IPv4 data with
436 struct UDP_Sock_Info udp_sockv4;
439 * socket that we transmit all IPv6 data with
441 struct UDP_Sock_Info udp_sockv6;
444 * ID of select gnunet-nat-server stdout read task
446 GNUNET_SCHEDULER_TaskIdentifier server_read_task;
449 * Is this transport configured to be behind a NAT?
454 * Is this transport configured to allow connections to NAT'd peers?
459 * Should this transport advertise only NAT addresses (port set to 0)?
460 * If not, all addresses will be duplicated for NAT punching and regular
463 int only_nat_addresses;
466 * The process id of the server process (if behind NAT)
468 struct GNUNET_OS_Process *server_proc;
474 * Forward declaration.
477 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result);
481 * Disconnect from a remote node. Clean up session if we have one for this peer
483 * @param cls closure for this call (should be handle to Plugin)
484 * @param target the peeridentity of the peer to disconnect
485 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
488 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
490 /** TODO: Implement! */
495 * Shutdown the server process (stop receiving inbound traffic). Maybe
498 * @param cls Handle to the plugin for this transport
500 * @return returns the number of sockets successfully closed,
501 * should equal the number of sockets successfully opened
504 udp_transport_server_stop (void *cls)
506 struct Plugin *plugin = cls;
508 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
510 GNUNET_SCHEDULER_cancel (plugin->select_task);
511 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
513 if (plugin->udp_sockv4.desc != NULL)
515 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->udp_sockv4.desc));
516 plugin->udp_sockv4.desc = NULL;
518 if (plugin->udp_sockv6.desc != NULL)
520 GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->udp_sockv6.desc));
521 plugin->udp_sockv6.desc = NULL;
523 if (plugin->behind_nat == GNUNET_YES)
525 if (0 != GNUNET_OS_process_kill (plugin->server_proc, SIGTERM))
526 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
527 GNUNET_OS_process_wait (plugin->server_proc);
528 GNUNET_OS_process_close (plugin->server_proc);
529 plugin->server_proc = NULL;
536 find_session (struct Plugin *plugin,
537 const struct GNUNET_PeerIdentity *peer)
539 struct PeerSession *pos;
541 pos = plugin->sessions;
544 if (memcmp(&pos->target, peer, sizeof(struct GNUNET_PeerIdentity)) == 0)
554 * Actually send out the message, assume we've got the address and
555 * send_handle squared away!
558 * @param send_handle which handle to send message on
559 * @param target who should receive this message (ignored by UDP)
560 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
561 * @param msgbuf_size the size of the msgbuf to send
562 * @param priority how important is the message (ignored by UDP)
563 * @param timeout when should we time out (give up) if we can not transmit?
564 * @param addr the addr to send the message to, needs to be a sockaddr for us
565 * @param addrlen the len of addr
566 * @param cont continuation to call once the message has
567 * been transmitted (or if the transport is ready
568 * for the next transmission call; or if the
569 * peer disconnected...)
570 * @param cont_cls closure for cont
571 * @return the number of bytes written
574 udp_real_send (void *cls,
575 struct GNUNET_NETWORK_Handle *send_handle,
576 const struct GNUNET_PeerIdentity *target,
579 unsigned int priority,
580 struct GNUNET_TIME_Relative timeout,
583 GNUNET_TRANSPORT_TransmitContinuation cont,
586 struct Plugin *plugin = cls;
587 struct UDPMessage *message;
590 struct sockaddr_in a4;
591 struct sockaddr_in6 a6;
592 const struct IPv4UdpAddress *t4;
593 const struct IPv6UdpAddress *t6;
597 if (send_handle == NULL)
599 /* failed to open send socket for AF */
601 cont (cont_cls, target, GNUNET_SYSERR);
604 if ((addr == NULL) || (addrlen == 0))
607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
608 "udp_real_send called without address, returning!\n");
611 cont (cont_cls, target, GNUNET_SYSERR);
612 return 0; /* Can never send if we don't have an address!! */
615 /* Build the message to be sent */
616 message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
617 ssize = sizeof (struct UDPMessage) + msgbuf_size;
619 message->header.size = htons (ssize);
620 message->header.type = htons (0);
621 memcpy (&message->sender, plugin->env->my_identity,
622 sizeof (struct GNUNET_PeerIdentity));
623 memcpy (&message[1], msgbuf, msgbuf_size);
625 if (addrlen == sizeof (struct IPv6UdpAddress))
628 memset (&a6, 0, sizeof (a6));
629 #if HAVE_SOCKADDR_IN_SIN_LEN
630 a6.sin6_len = sizeof (a6);
632 a6.sin6_family = AF_INET6;
633 a6.sin6_port = t6->u6_port;
634 memcpy (&a6.sin6_addr,
636 sizeof (struct in6_addr));
640 else if (addrlen == sizeof (struct IPv4UdpAddress))
643 memset (&a4, 0, sizeof (a4));
644 #if HAVE_SOCKADDR_IN_SIN_LEN
645 a4.sin_len = sizeof (a4);
647 a4.sin_family = AF_INET;
648 a4.sin_port = t4->u_port;
649 a4.sin_addr.s_addr = t4->ipv4_addr;
656 GNUNET_free (message);
660 /* Actually send the message */
662 GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
665 if (GNUNET_SYSERR == sent)
666 GNUNET_log_strerror(GNUNET_ERROR_TYPE_DEBUG, "sendto");
667 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
668 "UDP transmit %u-byte message to %s (%d: %s)\n",
669 (unsigned int) ssize,
670 GNUNET_a2s (sb, sbs),
672 (sent < 0) ? STRERROR (errno) : "ok");
675 if (sent == GNUNET_SYSERR)
676 cont (cont_cls, target, GNUNET_SYSERR);
679 cont (cont_cls, target, GNUNET_OK);
683 GNUNET_free (message);
688 * We learned about a peer (possibly behind NAT) so run the
689 * gnunet-nat-client to send dummy ICMP responses
691 * @param plugin the plugin for this transport
692 * @param addr the address of the peer
693 * @param addrlen the length of the address
696 run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
698 char addr_buf[INET_ADDRSTRLEN];
699 char *address_as_string;
700 char *port_as_string;
701 struct GNUNET_OS_Process *proc;
702 const struct IPv4UdpAddress *t4;
704 GNUNET_assert(addrlen == sizeof(struct IPv4UdpAddress));
705 t4 = (struct IPv4UdpAddress *)addr;
707 if (NULL == inet_ntop (AF_INET,
709 addr_buf, INET_ADDRSTRLEN))
711 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
714 address_as_string = GNUNET_strdup (addr_buf);
715 GNUNET_asprintf(&port_as_string, "%d", plugin->port);
717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
718 _("Running gnunet-nat-client with arguments: %s %s %d\n"), plugin->external_address, address_as_string, plugin->port);
721 /* Start the server process */
722 proc = GNUNET_OS_start_process (NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, port_as_string, NULL);
723 GNUNET_free(address_as_string);
724 GNUNET_free(port_as_string);
727 GNUNET_OS_process_wait (proc);
728 GNUNET_OS_process_close (proc);
734 * Function that can be used by the transport service to transmit
735 * a message using the plugin.
738 * @param target who should receive this message (ignored by UDP)
739 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
740 * @param msgbuf_size the size of the msgbuf to send
741 * @param priority how important is the message (ignored by UDP)
742 * @param timeout when should we time out (give up) if we can not transmit?
743 * @param session identifier used for this session (can be NULL)
744 * @param addr the addr to send the message to, needs to be a sockaddr for us
745 * @param addrlen the len of addr
746 * @param force_address not used, we had better have an address to send to
747 * because we are stateless!!
748 * @param cont continuation to call once the message has
749 * been transmitted (or if the transport is ready
750 * for the next transmission call; or if the
751 * peer disconnected...)
752 * @param cont_cls closure for cont
754 * @return the number of bytes written (may return 0 and the message can
755 * still be transmitted later!)
758 udp_plugin_send (void *cls,
759 const struct GNUNET_PeerIdentity *target,
762 unsigned int priority,
763 struct GNUNET_TIME_Relative timeout,
764 struct Session *session,
768 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
770 struct Plugin *plugin = cls;
772 struct MessageQueue *temp_message;
773 struct PeerSession *peer_session;
775 const struct IPv4UdpAddress *t4;
777 if (force_address == GNUNET_SYSERR)
778 return GNUNET_SYSERR;
779 GNUNET_assert (NULL == session);
781 other_peer_natd = GNUNET_NO;
782 if (addrlen == sizeof(struct IPv4UdpAddress))
785 if (ntohs(t4->u_port) == 0)
786 other_peer_natd = GNUNET_YES;
788 else if (addrlen != sizeof(struct IPv6UdpAddress))
791 return -1; /* Must have an address to send to */
795 if ((other_peer_natd == GNUNET_YES) && (plugin->allow_nat == GNUNET_YES))
797 peer_session = find_session(plugin, target);
798 if (peer_session == NULL) /* We have a new peer to add */
801 * The first time, we can assume we have no knowledge of a
802 * working port for this peer, call the ICMP/UDP message sender
805 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
806 peer_session->connect_addr = GNUNET_malloc(addrlen);
807 memcpy(peer_session->connect_addr, addr, addrlen);
808 peer_session->connect_alen = addrlen;
809 peer_session->plugin = plugin;
810 peer_session->sock = NULL;
811 memcpy(&peer_session->target, target, sizeof(struct GNUNET_PeerIdentity));
812 peer_session->expecting_welcome = GNUNET_YES;
814 peer_session->next = plugin->sessions;
815 plugin->sessions = peer_session;
817 peer_session->messages = GNUNET_malloc(sizeof(struct MessageQueue));
818 peer_session->messages->msgbuf = GNUNET_malloc(msgbuf_size);
819 memcpy(peer_session->messages->msgbuf, msgbuf, msgbuf_size);
820 peer_session->messages->msgbuf_size = msgbuf_size;
821 peer_session->messages->timeout = GNUNET_TIME_relative_to_absolute(timeout);
822 peer_session->messages->cont = cont;
823 peer_session->messages->cont_cls = cont_cls;
825 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
826 _("Other peer is NAT'd, set up peer session for peer %s\n"), GNUNET_i2s(target));
828 run_gnunet_nat_client(plugin, addr, addrlen);
832 if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */
834 sent = udp_real_send(cls,
839 peer_session->connect_addr, peer_session->connect_alen,
842 else /* Haven't gotten a response from this peer, queue message */
844 temp_message = GNUNET_malloc(sizeof(struct MessageQueue));
845 temp_message->msgbuf = GNUNET_malloc(msgbuf_size);
846 memcpy(temp_message->msgbuf, msgbuf, msgbuf_size);
847 temp_message->msgbuf_size = msgbuf_size;
848 temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout);
849 temp_message->cont = cont;
850 temp_message->cont_cls = cont_cls;
851 temp_message->next = peer_session->messages;
852 peer_session->messages = temp_message;
856 else if (other_peer_natd == GNUNET_NO) /* Other peer not behind a NAT, so we can just send the message as is */
858 sent = udp_real_send(cls,
859 (addrlen == sizeof (struct IPv4UdpAddress)) ? plugin->udp_sockv4.desc : plugin->udp_sockv6.desc,
862 priority, timeout, addr, addrlen,
865 else /* Other peer is NAT'd, but we don't want to play with them (or can't!) */
867 return GNUNET_SYSERR;
870 /* When GNUNET_SYSERR is returned from udp_real_send, we will still call
871 * the callback so must not return GNUNET_SYSERR!
872 * If we did, then transport context would get freed twice. */
873 if (sent == GNUNET_SYSERR)
880 add_to_address_list (struct Plugin *plugin,
884 struct LocalAddrList *lal;
886 lal = plugin->lal_head;
889 if ( (lal->size == arg_size) &&
890 (0 == memcmp (&lal[1], arg, arg_size)) )
894 lal = GNUNET_malloc (sizeof (struct LocalAddrList) + arg_size);
895 lal->size = arg_size;
896 memcpy (&lal[1], arg, arg_size);
897 GNUNET_CONTAINER_DLL_insert (plugin->lal_head,
904 check_local_addr (struct Plugin *plugin,
908 struct LocalAddrList *lal;
910 lal = plugin->lal_head;
913 if ( (lal->size == arg_size) &&
914 (0 == memcmp (&lal[1], arg, arg_size)) )
918 return GNUNET_SYSERR;
923 * Add the IP of our network interface to the list of
924 * our external IP addresses.
927 process_interfaces (void *cls,
930 const struct sockaddr *addr, socklen_t addrlen)
932 struct Plugin *plugin = cls;
934 struct IPv4UdpAddress t4;
935 struct IPv6UdpAddress t6;
939 char buf[INET6_ADDRSTRLEN];
942 af = addr->sa_family;
944 memset(buf, 0, INET6_ADDRSTRLEN);
947 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
948 GNUNET_assert(NULL != inet_ntop(AF_INET, &t4.ipv4_addr, &buf[0], INET_ADDRSTRLEN));
949 if ((plugin->bind6_address != NULL) || ((plugin->bind_address != NULL) && (0 != strcmp(buf, plugin->bind_address))))
951 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Not notifying transport of address %s\n", "UDP", GNUNET_a2s (addr, addrlen));
954 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (uint32_t));
955 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
957 t4.u_port = htons (DEFAULT_NAT_PORT);
959 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
961 addr_nat = GNUNET_malloc(sizeof(t4));
962 t4.u_port = htons (DEFAULT_NAT_PORT);
963 memcpy(addr_nat, &t4, sizeof(t4));
964 t4.u_port = plugin->port;
968 t4.u_port = htons(plugin->port);
973 else if (af == AF_INET6)
975 if (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr))
977 /* skip link local addresses */
980 memcpy (&t6.ipv6_addr,
981 &((struct sockaddr_in6 *) addr)->sin6_addr,
982 sizeof (struct in6_addr));
983 GNUNET_assert(NULL != inet_ntop(AF_INET6, &t6.ipv6_addr, &buf[0], INET6_ADDRSTRLEN));
984 if (((plugin->bind_address != NULL) && (0 != strcmp(buf, plugin->bind_address)))
985 || ((plugin->bind6_address != NULL) && (0 != strcmp(buf, plugin->bind6_address))))
987 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Not notifying transport of address %s\n", "UDP", GNUNET_a2s (addr, addrlen));
990 add_to_address_list (plugin, &t6.ipv6_addr, sizeof (struct in6_addr));
991 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
993 t6.u6_port = htons (DEFAULT_NAT_PORT);
995 else if (plugin->behind_nat == GNUNET_YES)
997 addr_nat = GNUNET_malloc(sizeof(t6));
998 t6.u6_port = htons (DEFAULT_NAT_PORT);
999 memcpy(addr_nat, &t6, sizeof(t6));
1000 t6.u6_port = plugin->port;
1004 t6.u6_port = htons (plugin->port);
1016 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
1017 GNUNET_ERROR_TYPE_BULK,
1018 _("Found address `%s' (%s)\n"),
1019 GNUNET_a2s (addr, addrlen), name);
1021 if (addr_nat != NULL)
1023 plugin->env->notify_address (plugin->env->cls,
1025 addr_nat, args, GNUNET_TIME_UNIT_FOREVER_REL);
1026 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
1027 GNUNET_ERROR_TYPE_BULK,
1028 _("Found NAT address `%s' (%s)\n"),
1029 GNUNET_a2s (addr_nat, args), name);
1030 GNUNET_free(addr_nat);
1033 plugin->env->notify_address (plugin->env->cls,
1035 arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
1041 * Function called by the resolver for each address obtained from DNS
1042 * for our own hostname. Add the addresses to the list of our
1043 * external IP addresses.
1045 * @param cls closure
1046 * @param addr one of the addresses of the host, NULL for the last address
1047 * @param addrlen length of the address
1050 process_hostname_ips (void *cls,
1051 const struct sockaddr *addr, socklen_t addrlen)
1053 struct Plugin *plugin = cls;
1057 plugin->hostname_dns = NULL;
1060 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
1065 * Send UDP probe messages or UDP keepalive messages, depending on the
1066 * state of the connection.
1068 * @param cls closure for this call (should be the main Plugin)
1069 * @param tc task context for running this
1072 send_udp_probe_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1074 struct UDP_NAT_Probes *probe = cls;
1075 struct UDP_NAT_ProbeMessage message;
1076 struct Plugin *plugin = probe->plugin;
1078 memset (&message, 0, sizeof (message));
1079 message.header.size = htons(sizeof(struct UDP_NAT_ProbeMessage));
1080 message.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE);
1081 /* If they gave us a port, use that. If not, try our port. */
1082 if (ntohs(probe->addr.u_port) == 0)
1083 probe->addr.u_port = htons(plugin->port);
1086 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1087 _("Sending a probe to port %d\n"), ntohs(probe->addr.u_port));
1090 udp_real_send(plugin,
1091 plugin->udp_sockv4.desc,
1093 (char *)&message, ntohs(message.header.size), 0,
1094 GNUNET_TIME_relative_get_unit(),
1095 &probe->addr, sizeof(struct IPv4UdpAddress),
1096 &udp_probe_continuation, probe);
1101 * Continuation for probe sends. If the last probe was sent
1102 * "successfully", schedule sending of another one. If not,
1106 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result)
1108 struct UDP_NAT_Probes *probe = cls;
1109 /*struct Plugin *plugin = probe->plugin;*/
1111 if ((result == GNUNET_OK) && (probe->count < MAX_PROBES))
1114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1115 _("Scheduling next probe for 10000 milliseconds\n"));
1117 probe->task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 10000), &send_udp_probe_message, probe);
1119 else /* Destroy the probe context. */
1122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1123 _("Sending probe didn't go well...\n"));
1129 * Find probe message by address
1131 * @param plugin the plugin for this transport
1132 * @param address_string the ip address as a string
1134 struct UDP_NAT_Probes *
1135 find_probe(struct Plugin *plugin, char * address_string)
1137 struct UDP_NAT_Probes *pos;
1139 pos = plugin->probes;
1141 if (strcmp(pos->address_string, address_string) == 0)
1149 * @param cls the plugin handle
1150 * @param tc the scheduling context (for rescheduling this function again)
1152 * We have been notified that gnunet-nat-server has written something to stdout.
1153 * Handle the output, then reschedule this function to be called again once
1154 * more is available.
1158 udp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1160 struct Plugin *plugin = cls;
1163 memset(&mybuf, 0, sizeof(mybuf));
1165 struct UDP_NAT_Probes *temp_probe;
1168 struct IPv4UdpAddress a4;
1170 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1173 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
1178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1179 _("Finished reading from server stdout with code: %d\n"), bytes);
1185 for (i = 0; i < sizeof(mybuf); i++)
1187 if (mybuf[i] == '\n')
1190 if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
1193 port_start = &mybuf[i + 1];
1197 if (port_start != NULL)
1198 port = atoi(port_start);
1201 plugin->server_read_task =
1202 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1203 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1209 _("nat-server-read read: %s port %d\n"), &mybuf, port);
1213 * We have received an ICMP response, ostensibly from a non-NAT'd peer
1214 * that wants to connect to us! Send a message to establish a connection.
1216 if (inet_pton(AF_INET, &mybuf[0], &a4.ipv4_addr) != 1)
1219 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1220 _("nat-server-read malformed address\n"), &mybuf, port);
1222 plugin->server_read_task =
1223 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1224 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1228 temp_probe = find_probe(plugin, &mybuf[0]);
1230 if (temp_probe == NULL)
1232 temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes));
1233 temp_probe->address_string = strdup(&mybuf[0]);
1234 GNUNET_assert (1 == inet_pton(AF_INET, &mybuf[0], &temp_probe->addr.ipv4_addr));
1235 temp_probe->addr.u_port = htons(port);
1236 temp_probe->next = plugin->probes;
1237 temp_probe->plugin = plugin;
1238 temp_probe->task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 500), &send_udp_probe_message, temp_probe);
1239 plugin->probes = temp_probe;
1242 plugin->server_read_task =
1243 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1244 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1250 * Demultiplexer for UDP NAT messages
1252 * @param plugin the main plugin for this transport
1253 * @param sender from which peer the message was received
1254 * @param currhdr pointer to the header of the message
1255 * @param sender_addr the address from which the message was received
1256 * @param fromlen the length of the address
1257 * @param sockinfo which socket did we receive the message on
1260 udp_demultiplexer(struct Plugin *plugin,
1261 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;
1268 char addr_buf[INET_ADDRSTRLEN];
1269 struct UDP_NAT_Probes *outgoing_probe;
1270 struct PeerSession *peer_session;
1271 struct MessageQueue *pending_message;
1272 struct MessageQueue *pending_message_temp;
1273 uint16_t incoming_port;
1275 if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
1278 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1279 _("Received a message from myself, dropping!!!\n"));
1285 GNUNET_assert(sender_addr != NULL); /* Can recvfrom have a NULL address? */
1286 if (fromlen == sizeof(struct IPv4UdpAddress))
1288 incoming_port = ntohs(((struct IPv4UdpAddress *)sender_addr)->u_port);
1290 else if (fromlen == sizeof(struct IPv6UdpAddress))
1292 incoming_port = ntohs(((struct IPv6UdpAddress *)sender_addr)->u6_port);
1295 switch (ntohs(currhdr->type))
1297 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE:
1298 /* Send probe reply */
1299 outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply));
1300 outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply));
1301 outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY);
1304 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1305 _("Received a probe on listen port %d, sent_from port %d\n"),
1306 sockinfo->port, incoming_port);
1309 udp_real_send(plugin, sockinfo->desc, NULL,
1310 (char *)outgoing_probe_reply,
1311 ntohs(outgoing_probe_reply->header.size), 0,
1312 GNUNET_TIME_relative_get_unit(),
1313 sender_addr, fromlen,
1317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1318 _("Sent PROBE REPLY to port %d on outgoing port %d\n"),
1319 incoming_port, sockinfo->port);
1321 GNUNET_free(outgoing_probe_reply);
1323 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY:
1324 /* Check for existing probe, check ports returned, send confirmation if all is well */
1326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1327 _("Received PROBE REPLY from port %d on incoming port %d\n"), incoming_port, sockinfo->port);
1329 if (fromlen == sizeof(struct IPv4UdpAddress))
1331 memset(&addr_buf, 0, sizeof(addr_buf));
1332 if (NULL == inet_ntop (AF_INET,
1333 &((struct IPv4UdpAddress *) sender_addr)->ipv4_addr, addr_buf,
1336 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
1339 outgoing_probe = find_probe(plugin, &addr_buf[0]);
1340 if (outgoing_probe != NULL)
1343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1344 _("Sending confirmation that we were reached!\n"));
1346 outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1347 outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1348 outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM);
1349 udp_real_send(plugin, sockinfo->desc, NULL,
1350 (char *)outgoing_probe_confirmation,
1351 ntohs(outgoing_probe_confirmation->header.size), 0,
1352 GNUNET_TIME_relative_get_unit(),
1353 sender_addr, fromlen, NULL, NULL);
1355 if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK)
1357 GNUNET_SCHEDULER_cancel(outgoing_probe->task);
1358 outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK;
1359 /* Schedule task to timeout and remove probe if confirmation not received */
1361 GNUNET_free(outgoing_probe_confirmation);
1366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1367 _("Received a probe reply, but have no record of a sent probe!\n"));
1374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1375 _("Received a probe reply, but sender address size is WRONG (should be %d, is %d)!\n"), sizeof(struct IPv4UdpAddress), fromlen);
1379 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM:
1380 peer_session = find_session(plugin, sender);
1382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1383 _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
1385 if (peer_session == NULL) /* Shouldn't this NOT happen? */
1388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1389 _("Peer not in list, adding (THIS MAY BE A MISTAKE) %s\n"), GNUNET_i2s(sender));
1391 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
1392 peer_session->connect_addr = GNUNET_malloc(fromlen);
1393 memcpy(peer_session->connect_addr, sender_addr, fromlen);
1394 peer_session->connect_alen = fromlen;
1395 peer_session->plugin = plugin;
1396 peer_session->sock = sockinfo->desc;
1397 memcpy(&peer_session->target, sender, sizeof(struct GNUNET_PeerIdentity));
1398 peer_session->expecting_welcome = GNUNET_NO;
1400 peer_session->next = plugin->sessions;
1401 plugin->sessions = peer_session;
1403 peer_session->messages = NULL;
1405 else if (peer_session->expecting_welcome == GNUNET_YES)
1407 peer_session->expecting_welcome = GNUNET_NO;
1408 peer_session->sock = sockinfo->desc;
1409 if (peer_session->connect_alen == sizeof(struct IPv4UdpAddress))
1411 ((struct IPv4UdpAddress *)peer_session->connect_addr)->u_port = htons(incoming_port);
1413 else if (peer_session->connect_alen == sizeof(struct IPv4UdpAddress))
1415 ((struct IPv6UdpAddress *)peer_session->connect_addr)->u6_port = htons(incoming_port);
1419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1420 _("Received a probe confirmation, will send to peer on port %d\n"), incoming_port);
1422 if (peer_session->messages != NULL)
1425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1426 _("Received a probe confirmation, sending queued messages.\n"));
1428 pending_message = peer_session->messages;
1430 while (pending_message != NULL)
1433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1434 _("sending queued message %d\n"), count);
1436 udp_real_send(plugin,
1438 &peer_session->target,
1439 pending_message->msgbuf,
1440 pending_message->msgbuf_size, 0,
1441 GNUNET_TIME_relative_get_unit(),
1442 peer_session->connect_addr,
1443 peer_session->connect_alen,
1444 pending_message->cont,
1445 pending_message->cont_cls);
1447 pending_message_temp = pending_message;
1448 pending_message = pending_message->next;
1449 GNUNET_free(pending_message_temp->msgbuf);
1450 GNUNET_free(pending_message_temp);
1452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1453 _("finished sending queued message %d\n"), count);
1463 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1464 _("Received probe confirmation for already confirmed peer!\n"));
1467 /* Received confirmation, add peer with address/port specified */
1469 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE:
1470 /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */
1471 /* If we receive these just ignore! */
1475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1476 "Sending message type %d to transport!\n",
1477 ntohs(currhdr->type));
1479 struct GNUNET_TRANSPORT_ATS_Information distance[2];
1480 distance[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
1481 distance[0].value = htonl (UDP_DIRECT_DISTANCE);
1482 distance[1].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1483 distance[1].value = htonl (0);
1485 plugin->env->receive (plugin->env->cls, sender, currhdr,
1486 (const struct GNUNET_TRANSPORT_ATS_Information *) &distance, 2,
1487 NULL, sender_addr, fromlen);
1494 * @param cls the plugin handle
1495 * @param tc the scheduling context (for rescheduling this function again)
1497 * We have been notified that our writeset has something to read. We don't
1498 * know which socket needs to be read, so we have to check each one
1499 * Then reschedule this function to be called again once more is available.
1503 udp_plugin_select (void *cls,
1504 const struct GNUNET_SCHEDULER_TaskContext *tc)
1506 struct Plugin *plugin = cls;
1508 struct UDPMessage *msg;
1509 struct GNUNET_PeerIdentity sender;
1516 const struct GNUNET_MessageHeader *currhdr;
1517 struct IPv4UdpAddress t4;
1518 struct IPv6UdpAddress t6;
1519 const struct sockaddr_in *s4;
1520 const struct sockaddr_in6 *s6;
1523 struct UDP_Sock_Info *udp_sock;
1526 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1527 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1530 if (GNUNET_NETWORK_fdset_isset (tc->read_ready,
1531 plugin->udp_sockv4.desc))
1532 udp_sock = &plugin->udp_sockv4;
1533 else if (GNUNET_NETWORK_fdset_isset (tc->read_ready,
1534 plugin->udp_sockv6.desc))
1535 udp_sock = &plugin->udp_sockv6;
1536 if (NULL == udp_sock)
1541 fromlen = sizeof (addr);
1542 memset (&addr, 0, sizeof(addr));
1544 GNUNET_NETWORK_socket_recvfrom (udp_sock->desc, buf, sizeof (buf),
1545 (struct sockaddr *)&addr, &fromlen);
1547 if (AF_INET == ((struct sockaddr *)addr)->sa_family)
1549 s4 = (const struct sockaddr_in*) &addr;
1550 t4.u_port = s4->sin_port;
1551 t4.ipv4_addr = s4->sin_addr.s_addr;
1553 calen = sizeof (t4);
1555 else if (AF_INET6 == ((struct sockaddr *)addr)->sa_family)
1557 s6 = (const struct sockaddr_in6*) &addr;
1558 t6.u6_port = s6->sin6_port;
1559 memcpy (&t6.ipv6_addr,
1561 sizeof (struct in6_addr));
1563 calen = sizeof (t6);
1571 if (ret < sizeof (struct UDPMessage))
1573 GNUNET_break_op (0);
1574 plugin->select_task =
1575 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1576 GNUNET_SCHEDULER_NO_TASK,
1577 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1578 NULL, &udp_plugin_select, plugin);
1581 msg = (struct UDPMessage *) buf;
1582 csize = ntohs (msg->header.size);
1583 if ( (csize < sizeof (struct UDPMessage)) ||
1586 GNUNET_break_op (0);
1587 plugin->select_task =
1588 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1589 GNUNET_SCHEDULER_NO_TASK,
1590 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1591 NULL, &udp_plugin_select, plugin);
1594 msgbuf = (char *)&msg[1];
1595 memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1597 tsize = csize - sizeof (struct UDPMessage);
1598 while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
1600 currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
1601 csize = ntohs (currhdr->size);
1602 if ( (csize < sizeof (struct GNUNET_MessageHeader)) ||
1603 (csize > tsize - offset) )
1605 GNUNET_break_op (0);
1608 udp_demultiplexer(plugin, &sender, currhdr,
1609 ca, calen, udp_sock);
1612 plugin->select_task =
1613 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1614 GNUNET_SCHEDULER_NO_TASK,
1615 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1616 NULL, &udp_plugin_select, plugin);
1621 * Create a slew of UDP sockets. If possible, use IPv6 and IPv4.
1623 * @param cls closure for server start, should be a struct Plugin *
1624 * @return number of sockets created or GNUNET_SYSERR on error
1627 udp_transport_server_start (void *cls)
1629 struct Plugin *plugin = cls;
1630 struct sockaddr_in serverAddrv4;
1631 struct sockaddr_in6 serverAddrv6;
1632 struct sockaddr *serverAddr;
1634 int sockets_created;
1638 sockets_created = 0;
1639 if (plugin->behind_nat == GNUNET_YES)
1641 /* Pipe to read from started processes stdout (on read end) */
1642 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES, GNUNET_NO, GNUNET_YES);
1643 if (plugin->server_stdout == NULL)
1644 return sockets_created;
1646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1647 "Starting gnunet-nat-server process cmd: %s %s\n",
1648 "gnunet-nat-server",
1649 plugin->internal_address);
1651 /* Start the server process */
1652 plugin->server_proc = GNUNET_OS_start_process(NULL,
1653 plugin->server_stdout,
1654 "gnunet-nat-server",
1655 "gnunet-nat-server",
1656 plugin->internal_address, NULL);
1657 if (plugin->server_proc == NULL)
1660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1661 "Failed to start gnunet-nat-server process\n");
1663 return GNUNET_SYSERR;
1665 /* Close the write end of the read pipe */
1666 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
1668 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
1669 plugin->server_read_task =
1670 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1671 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1675 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "transport-udp",
1678 plugin->udp_sockv6.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
1679 if (NULL == plugin->udp_sockv6.desc)
1681 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
1685 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1686 #if HAVE_SOCKADDR_IN_SIN_LEN
1687 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1690 serverAddrv6.sin6_family = AF_INET6;
1691 serverAddrv6.sin6_addr = in6addr_any;
1692 if (plugin->bind6_address != NULL)
1694 if (1 != inet_pton(AF_INET6, plugin->bind6_address, &serverAddrv6.sin6_addr))
1698 serverAddrv6.sin6_port = htons (plugin->port);
1699 addrlen = sizeof (serverAddrv6);
1700 serverAddr = (struct sockaddr *) &serverAddrv6;
1702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1703 "Binding to IPv6 port %d\n",
1704 ntohs(serverAddrv6.sin6_port));
1707 while (GNUNET_NETWORK_socket_bind (plugin->udp_sockv6.desc, serverAddr, addrlen) !=
1710 serverAddrv6.sin6_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1712 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1713 "IPv6 Binding failed, trying new port %d\n",
1714 ntohs(serverAddrv6.sin6_port));
1719 GNUNET_NETWORK_socket_close (plugin->udp_sockv6.desc);
1720 plugin->udp_sockv6.desc = NULL;
1724 if (plugin->udp_sockv6.desc != NULL)
1726 plugin->udp_sockv6.port = ntohs(serverAddrv6.sin6_port);
1732 plugin->udp_sockv4.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
1733 if (NULL == plugin->udp_sockv4.desc)
1735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "socket");
1739 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1740 #if HAVE_SOCKADDR_IN_SIN_LEN
1741 serverAddrv4.sin_len = sizeof (serverAddrv4);
1743 serverAddrv4.sin_family = AF_INET;
1744 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1745 if (plugin->bind_address != NULL)
1747 if (1 != inet_pton(AF_INET, plugin->bind_address, &serverAddrv4.sin_addr))
1750 serverAddrv4.sin_port = htons (plugin->port);
1751 addrlen = sizeof (serverAddrv4);
1752 serverAddr = (struct sockaddr *) &serverAddrv4;
1754 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1755 "Binding to IPv4 port %d\n",
1756 ntohs(serverAddrv4.sin_port));
1759 while (GNUNET_NETWORK_socket_bind (plugin->udp_sockv4.desc, serverAddr, addrlen) !=
1762 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1765 "IPv4 Binding failed, trying new port %d\n",
1766 ntohs(serverAddrv4.sin_port));
1771 GNUNET_NETWORK_socket_close (plugin->udp_sockv4.desc);
1772 plugin->udp_sockv4.desc = NULL;
1776 if (plugin->udp_sockv4.desc != NULL)
1778 plugin->udp_sockv4.port = ntohs(serverAddrv4.sin_port);
1783 plugin->rs = GNUNET_NETWORK_fdset_create ();
1784 GNUNET_NETWORK_fdset_zero (plugin->rs);
1785 if (NULL != plugin->udp_sockv4.desc)
1786 GNUNET_NETWORK_fdset_set (plugin->rs,
1787 plugin->udp_sockv4.desc);
1788 if (NULL != plugin->udp_sockv6.desc)
1789 GNUNET_NETWORK_fdset_set (plugin->rs,
1790 plugin->udp_sockv6.desc);
1792 plugin->select_task =
1793 GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1794 GNUNET_SCHEDULER_NO_TASK,
1795 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1796 NULL, &udp_plugin_select, plugin);
1797 return sockets_created;
1803 * Check if the given port is plausible (must be either
1804 * our listen port or our advertised port). If it is
1805 * neither, we return GNUNET_SYSERR.
1807 * @param plugin global variables
1808 * @param in_port port number to check
1809 * @return GNUNET_OK if port is either open_port or adv_port
1812 check_port (struct Plugin *plugin, uint16_t in_port)
1814 if ( (plugin->behind_nat == GNUNET_YES) && (in_port == 0) )
1816 if ( (plugin->only_nat_addresses == GNUNET_YES) &&
1817 (plugin->behind_nat == GNUNET_YES) )
1818 return GNUNET_SYSERR; /* odd case... */
1819 if (in_port == plugin->port)
1821 return GNUNET_SYSERR;
1826 * Function that will be called to check if a binary address for this
1827 * plugin is well-formed and corresponds to an address for THIS peer
1828 * (as per our configuration). Naturally, if absolutely necessary,
1829 * plugins can be a bit conservative in their answer, but in general
1830 * plugins should make sure that the address does not redirect
1831 * traffic to a 3rd party that might try to man-in-the-middle our
1834 * @param cls closure, should be our handle to the Plugin
1835 * @param addr pointer to the address
1836 * @param addrlen length of addr
1837 * @return GNUNET_OK if this is a plausible address for this peer
1838 * and transport, GNUNET_SYSERR if not
1842 udp_check_address (void *cls,
1846 struct Plugin *plugin = cls;
1847 char buf[INET6_ADDRSTRLEN];
1853 struct IPv4UdpAddress *v4;
1854 struct IPv6UdpAddress *v6;
1856 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
1857 (addrlen != sizeof (struct IPv6UdpAddress)))
1859 GNUNET_break_op (0);
1860 return GNUNET_SYSERR;
1863 if (addrlen == sizeof (struct IPv4UdpAddress))
1865 v4 = (struct IPv4UdpAddress *) addr;
1867 check_port (plugin, ntohs (v4->u_port)))
1868 return GNUNET_SYSERR;
1870 check_local_addr (plugin, &v4->ipv4_addr, sizeof (uint32_t)))
1871 return GNUNET_SYSERR;
1874 port = ntohs (v4->u_port);
1875 memcpy (&a4, &v4->ipv4_addr, sizeof (a4));
1880 v6 = (struct IPv6UdpAddress *) addr;
1881 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1883 GNUNET_break_op (0);
1884 return GNUNET_SYSERR;
1887 check_port (plugin, ntohs (v6->u6_port)))
1888 return GNUNET_SYSERR;
1890 check_local_addr (plugin, &v6->ipv6_addr, sizeof (struct in6_addr)))
1891 return GNUNET_SYSERR;
1894 port = ntohs (v6->u6_port);
1895 memcpy (&a6, &v6->ipv6_addr, sizeof (a6));
1899 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
1902 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1903 "Informing transport service about my address `%s:%u'\n",
1912 * Append our port and forward the result.
1915 append_port (void *cls, const char *hostname)
1917 struct PrettyPrinterContext *ppc = cls;
1920 if (hostname == NULL)
1922 ppc->asc (ppc->asc_cls, NULL);
1926 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1927 ppc->asc (ppc->asc_cls, ret);
1933 * Convert the transports address to a nice, human-readable
1936 * @param cls closure
1937 * @param type name of the transport that generated the address
1938 * @param addr one of the addresses of the host, NULL for the last address
1939 * the specific address format depends on the transport
1940 * @param addrlen length of the address
1941 * @param numeric should (IP) addresses be displayed in numeric form?
1942 * @param timeout after how long should we give up?
1943 * @param asc function to call on each string
1944 * @param asc_cls closure for asc
1947 udp_plugin_address_pretty_printer (void *cls,
1952 struct GNUNET_TIME_Relative timeout,
1953 GNUNET_TRANSPORT_AddressStringCallback asc,
1956 struct Plugin *plugin = cls;
1957 struct PrettyPrinterContext *ppc;
1960 struct sockaddr_in a4;
1961 struct sockaddr_in6 a6;
1962 const struct IPv4UdpAddress *u4;
1963 const struct IPv6UdpAddress *u6;
1966 if (addrlen == sizeof (struct IPv6UdpAddress))
1969 memset (&a6, 0, sizeof (a6));
1970 a6.sin6_family = AF_INET6;
1971 a6.sin6_port = u6->u6_port;
1972 memcpy (&a6.sin6_addr,
1974 sizeof (struct in6_addr));
1975 port = ntohs (u6->u6_port);
1979 else if (addrlen == sizeof (struct IPv4UdpAddress))
1982 memset (&a4, 0, sizeof (a4));
1983 a4.sin_family = AF_INET;
1984 a4.sin_port = u4->u_port;
1985 a4.sin_addr.s_addr = u4->ipv4_addr;
1986 port = ntohs (u4->u_port);
1992 /* invalid address */
1993 GNUNET_break_op (0);
1994 asc (asc_cls, NULL);
1997 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1999 ppc->asc_cls = asc_cls;
2001 GNUNET_RESOLVER_hostname_get (plugin->env->cfg,
2004 !numeric, timeout, &append_port, ppc);
2008 * Return the actual path to a file found in the current
2009 * PATH environment variable.
2011 * @param binary the name of the file to find
2014 get_path_from_PATH (char *binary)
2022 p = getenv ("PATH");
2025 path = GNUNET_strdup (p); /* because we write on it */
2026 buf = GNUNET_malloc (strlen (path) + 20);
2029 while (NULL != (end = strchr (pos, PATH_SEPARATOR)))
2032 sprintf (buf, "%s/%s", pos, binary);
2033 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2040 sprintf (buf, "%s/%s", pos, binary);
2041 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2052 * Check whether the suid bit is set on a file.
2053 * Attempts to find the file using the current
2054 * PATH environment variable as a search path.
2056 * @param binary the name of the file to check
2059 check_gnunet_nat_binary(char *binary)
2061 struct stat statbuf;
2069 GNUNET_asprintf (&binaryexe, "%s.exe", binary);
2070 p = get_path_from_PATH (binaryexe);
2073 p = get_path_from_PATH (binary);
2077 if (0 != STAT (p, &statbuf))
2080 return GNUNET_SYSERR;
2084 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
2085 (statbuf.st_uid == 0) )
2089 rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
2090 if (INVALID_SOCKET == rawsock)
2092 DWORD err = GetLastError ();
2093 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "socket (AF_INET, SOCK_RAW, IPPROTO_ICMP) have failed! GLE = %d\n", err);
2094 return GNUNET_NO; /* not running as administrator */
2096 closesocket (rawsock);
2102 * Function called for a quick conversion of the binary address to
2103 * a numeric address. Note that the caller must not free the
2104 * address and that the next call to this function is allowed
2105 * to override the address again.
2107 * @param cls closure
2108 * @param addr binary address
2109 * @param addrlen length of the address
2110 * @return string representing the same address
2113 udp_address_to_string (void *cls,
2117 static char rbuf[INET6_ADDRSTRLEN + 10];
2118 char buf[INET6_ADDRSTRLEN];
2122 const struct IPv4UdpAddress *t4;
2123 const struct IPv6UdpAddress *t6;
2127 if (addrlen == sizeof (struct IPv6UdpAddress))
2131 port = ntohs (t6->u6_port);
2132 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
2135 else if (addrlen == sizeof (struct IPv4UdpAddress))
2139 port = ntohs (t4->u_port);
2140 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
2145 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
2146 GNUNET_snprintf (rbuf,
2155 * The exported method. Makes the core api available via a global and
2156 * returns the udp transport API.
2159 libgnunet_plugin_transport_udp_init (void *cls)
2161 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2162 unsigned long long mtu;
2163 unsigned long long port;
2164 struct GNUNET_TRANSPORT_PluginFunctions *api;
2165 struct Plugin *plugin;
2166 int sockets_created;
2169 int only_nat_addresses;
2170 char *internal_address;
2171 char *external_address;
2172 struct IPv4UdpAddress v4_address;
2174 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2178 /* We are behind nat (according to the user) */
2179 if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
2180 behind_nat = GNUNET_YES;
2183 behind_nat = GNUNET_NO;
2184 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");
2188 behind_nat = GNUNET_NO; /* We are not behind nat! */
2190 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2194 if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
2195 allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
2198 allow_nat = GNUNET_NO;
2199 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");
2204 allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
2206 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2208 "ONLY_NAT_ADDRESSES"))
2209 only_nat_addresses = GNUNET_YES; /* We will only report our addresses as NAT'd */
2211 only_nat_addresses = GNUNET_NO; /* We will report our addresses as NAT'd and non-NAT'd */
2213 external_address = NULL;
2214 if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
2215 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2218 &external_address)))
2220 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2221 _("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
2226 if ((external_address != NULL) && (inet_pton(AF_INET, external_address, &v4_address.ipv4_addr) != 1))
2228 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Malformed EXTERNAL_ADDRESS %s given in configuration!\n", external_address);
2231 internal_address = NULL;
2232 if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
2233 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2236 &internal_address)))
2238 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2239 _("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
2241 GNUNET_free_non_null(external_address);
2245 if ((internal_address != NULL) && (inet_pton(AF_INET, internal_address, &v4_address.ipv4_addr) != 1))
2247 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Malformed INTERNAL_ADDRESS %s given in configuration!\n", internal_address);
2251 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2255 port = UDP_NAT_DEFAULT_PORT;
2256 else if (port > 65535)
2258 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2259 _("Given `%s' option is out of range: %llu > %u\n"),
2263 GNUNET_free_non_null(external_address);
2264 GNUNET_free_non_null(internal_address);
2270 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2271 _("MTU %llu for `%s' is probably too low!\n"), mtu,
2274 plugin = GNUNET_malloc (sizeof (struct Plugin));
2275 plugin->external_address = external_address;
2276 plugin->internal_address = internal_address;
2277 plugin->port = port;
2278 plugin->behind_nat = behind_nat;
2279 plugin->allow_nat = allow_nat;
2280 plugin->only_nat_addresses = only_nat_addresses;
2283 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2286 api->send = &udp_plugin_send;
2287 api->disconnect = &udp_disconnect;
2288 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
2289 api->address_to_string = &udp_address_to_string;
2290 api->check_address = &udp_check_address;
2292 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string(env->cfg, "transport-udp", "BINDTO", &plugin->bind_address))
2293 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Binding udp plugin to specific address: `%s'\n", plugin->bind_address);
2294 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string(env->cfg, "transport-udp", "BINDTO6", &plugin->bind6_address))
2295 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Binding udp plugin to specific address: `%s'\n", 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_NETWORK_fdset_destroy (plugin->rs);
2348 while (NULL != (lal = plugin->lal_head))
2350 GNUNET_CONTAINER_DLL_remove (plugin->lal_head,
2355 GNUNET_free (plugin);
2360 /* end of plugin_transport_udp.c */