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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_os_lib.h"
44 #include "gnunet_peerinfo_service.h"
45 #include "gnunet_protocols.h"
46 #include "gnunet_resolver_service.h"
47 #include "gnunet_server_lib.h"
48 #include "gnunet_service_lib.h"
49 #include "gnunet_signatures.h"
50 #include "gnunet_statistics_service.h"
51 #include "gnunet_transport_service.h"
52 #include "plugin_transport.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 /* Forward definition */
97 struct PrettyPrinterContext
99 GNUNET_TRANSPORT_AddressStringCallback asc;
109 struct MessageQueue *next;
112 * Session this message belongs to
114 struct PeerSession *session;
117 * Actual message to be sent
122 * Size of message buffer to be sent
127 * When to discard this message
129 struct GNUNET_TIME_Absolute timeout;
132 * Continuation to call when this message goes out
134 GNUNET_TRANSPORT_TransmitContinuation cont;
137 * closure for continuation
144 * UDP NAT Probe message definition
146 struct UDP_NAT_ProbeMessage
151 struct GNUNET_MessageHeader header;
156 * UDP NAT Probe message reply definition
158 struct UDP_NAT_ProbeMessageReply
163 struct GNUNET_MessageHeader header;
169 * UDP NAT Probe message confirm definition
171 struct UDP_NAT_ProbeMessageConfirmation
176 struct GNUNET_MessageHeader header;
189 * Stored in a linked list.
191 struct PeerSession *next;
194 * Pointer to the global plugin struct.
196 struct Plugin *plugin;
199 * To whom are we talking to (set to our identity
200 * if we are still waiting for the welcome message)
202 struct GNUNET_PeerIdentity target;
205 * Address of the other peer (either based on our 'connect'
206 * call or on our 'accept' call).
211 * Length of connect_addr.
216 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
218 int expecting_welcome;
221 * From which socket do we need to send to this peer?
223 struct GNUNET_NETWORK_Handle *sock;
226 * Queue of messages for this peer, in the case that
227 * we have to await a connection...
229 struct MessageQueue *messages;
233 struct UDP_NAT_Probes
239 struct UDP_NAT_Probes *next;
242 * Address string that the server process returned to us
244 char *address_string;
247 * Timeout for this set of probes
249 struct GNUNET_TIME_Absolute timeout;
252 * Count of how many probes we've attempted
257 * The plugin this probe belongs to
259 struct Plugin *plugin;
262 * The task used to send these probes
264 GNUNET_SCHEDULER_TaskIdentifier task;
267 * Network address (always ipv4)
269 struct sockaddr_in sock_addr;
272 * The port to send this probe to, 0 to choose randomly
280 * Encapsulation of all of the state of the plugin.
287 struct GNUNET_TRANSPORT_PluginEnvironment *env;
290 * Handle to the network service.
292 struct GNUNET_SERVICE_Context *service;
295 * Session of peers with whom we are currently connected
297 struct PeerSession *sessions;
300 * Handle for request of hostname resolution, non-NULL if pending.
302 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
305 * ID of task used to update our addresses when one expires.
307 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
312 GNUNET_SCHEDULER_TaskIdentifier select_task;
320 * The external address given to us by the user. Must be actual
321 * outside visible address for NAT punching to work.
323 char *external_address;
326 * The internal address given to us by the user (or discovered).
328 char *internal_address;
333 struct GNUNET_NETWORK_FDSet *rs;
336 * stdout pipe handle for the gnunet-nat-server process
338 struct GNUNET_DISK_PipeHandle *server_stdout;
341 * stdout file handle (for reading) for the gnunet-nat-server process
343 const struct GNUNET_DISK_FileHandle *server_stdout_handle;
346 * ID of select gnunet-nat-server stdout read task
348 GNUNET_SCHEDULER_TaskIdentifier server_read_task;
351 * Is this transport configured to be behind a NAT?
356 * Is this transport configured to allow connections to NAT'd peers?
361 * Should this transport advertise only NAT addresses (port set to 0)?
362 * If not, all addresses will be duplicated for NAT punching and regular
365 int only_nat_addresses;
368 * The process id of the server process (if behind NAT)
375 struct UDP_NAT_Probes *probes;
382 /* The network handle */
383 struct GNUNET_NETWORK_Handle *desc;
385 /* The port we bound to */
389 /* *********** globals ************* */
392 * the socket that we transmit all data with
394 static struct UDP_Sock_Info udp_sock;
398 * Forward declaration.
401 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result);
405 * Disconnect from a remote node. Clean up session if we have one for this peer
407 * @param cls closure for this call (should be handle to Plugin)
408 * @param target the peeridentity of the peer to disconnect
409 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
412 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
414 /** TODO: Implement! */
419 * Shutdown the server process (stop receiving inbound traffic). Maybe
422 * @param cls Handle to the plugin for this transport
424 * @return returns the number of sockets successfully closed,
425 * should equal the number of sockets successfully opened
428 udp_transport_server_stop (void *cls)
430 struct Plugin *plugin = cls;
435 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
437 GNUNET_SCHEDULER_cancel (plugin->env->sched, plugin->select_task);
438 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
441 ok = GNUNET_NETWORK_socket_close (udp_sock.desc);
443 udp_sock.desc = NULL;
446 if (plugin->behind_nat == GNUNET_YES)
448 if (0 != PLIBC_KILL (plugin->server_pid, SIGTERM))
450 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
452 GNUNET_OS_process_wait (plugin->server_pid);
455 if (ret != GNUNET_OK)
456 return GNUNET_SYSERR;
462 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
464 struct PeerSession *pos;
466 pos = plugin->sessions;
469 if (memcmp(&pos->target, peer, sizeof(struct GNUNET_PeerIdentity)) == 0)
479 * Actually send out the message, assume we've got the address and
480 * send_handle squared away!
483 * @param send_handle which handle to send message on
484 * @param target who should receive this message (ignored by UDP)
485 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
486 * @param msgbuf_size the size of the msgbuf to send
487 * @param priority how important is the message (ignored by UDP)
488 * @param timeout when should we time out (give up) if we can not transmit?
489 * @param addr the addr to send the message to, needs to be a sockaddr for us
490 * @param addrlen the len of addr
491 * @param cont continuation to call once the message has
492 * been transmitted (or if the transport is ready
493 * for the next transmission call; or if the
494 * peer disconnected...)
495 * @param cont_cls closure for cont
496 * @return the number of bytes written
499 udp_real_send (void *cls,
500 struct GNUNET_NETWORK_Handle *send_handle,
501 const struct GNUNET_PeerIdentity *target,
504 unsigned int priority,
505 struct GNUNET_TIME_Relative timeout,
508 GNUNET_TRANSPORT_TransmitContinuation cont,
511 struct Plugin *plugin = cls;
512 struct UDPMessage *message;
516 if ((addr == NULL) || (addrlen == 0))
519 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
520 ("udp_plugin_send called without address, returning!\n"));
523 cont (cont_cls, target, GNUNET_SYSERR);
524 return 0; /* Can never send if we don't have an address!! */
527 /* Build the message to be sent */
528 message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
529 ssize = sizeof (struct UDPMessage) + msgbuf_size;
531 message->header.size = htons (ssize);
532 message->header.type = htons (0);
533 memcpy (&message->sender, plugin->env->my_identity,
534 sizeof (struct GNUNET_PeerIdentity));
535 memcpy (&message[1], msgbuf, msgbuf_size);
537 /* Actually send the message */
539 GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
545 if (sent == GNUNET_SYSERR)
546 cont (cont_cls, target, GNUNET_SYSERR);
549 cont (cont_cls, target, GNUNET_OK);
553 GNUNET_free (message);
558 * We learned about a peer (possibly behind NAT) so run the
559 * gnunet-nat-client to send dummy ICMP responses
561 * @param plugin the plugin for this transport
562 * @param addr the address of the peer
563 * @param addrlen the length of the address
566 run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
568 char inet4[INET_ADDRSTRLEN];
569 char *address_as_string;
570 char *port_as_string;
572 const struct sockaddr *sa = (const struct sockaddr *)addr;
574 if (addrlen < sizeof (struct sockaddr))
576 switch (sa->sa_family)
579 if (addrlen != sizeof (struct sockaddr_in))
581 if (NULL == inet_ntop (AF_INET,
582 &((struct sockaddr_in *) sa)->sin_addr,
583 inet4, INET_ADDRSTRLEN))
585 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
588 address_as_string = GNUNET_strdup (inet4);
595 GNUNET_asprintf(&port_as_string, "%d", plugin->port);
597 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
598 _("Running gnunet-nat-client with arguments: %s %s %d\n"), plugin->external_address, address_as_string, plugin->port);
601 /* Start the server process */
602 pid = GNUNET_OS_start_process(NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, port_as_string, NULL);
603 GNUNET_free(address_as_string);
604 GNUNET_free(port_as_string);
605 GNUNET_OS_process_wait (pid);
609 * Function that can be used by the transport service to transmit
610 * a message using the plugin.
613 * @param target who should receive this message (ignored by UDP)
614 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
615 * @param msgbuf_size the size of the msgbuf to send
616 * @param priority how important is the message (ignored by UDP)
617 * @param timeout when should we time out (give up) if we can not transmit?
618 * @param session identifier used for this session (can be NULL)
619 * @param addr the addr to send the message to, needs to be a sockaddr for us
620 * @param addrlen the len of addr
621 * @param force_address not used, we had better have an address to send to
622 * because we are stateless!!
623 * @param cont continuation to call once the message has
624 * been transmitted (or if the transport is ready
625 * for the next transmission call; or if the
626 * peer disconnected...)
627 * @param cont_cls closure for cont
629 * @return the number of bytes written (may return 0 and the message can
630 * still be transmitted later!)
633 udp_plugin_send (void *cls,
634 const struct GNUNET_PeerIdentity *target,
637 unsigned int priority,
638 struct GNUNET_TIME_Relative timeout,
639 struct Session *session,
643 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
645 struct Plugin *plugin = cls;
647 struct MessageQueue *temp_message;
648 struct PeerSession *peer_session;
649 struct sockaddr_in *sockaddr = (struct sockaddr_in *)addr;
652 GNUNET_assert (NULL == session);
653 other_peer_natd = GNUNET_NO;
654 if ((sockaddr->sin_family == AF_INET) && (ntohs(sockaddr->sin_port) == 0))
656 other_peer_natd = GNUNET_YES;
661 if ((other_peer_natd == GNUNET_YES) && (plugin->allow_nat == GNUNET_YES))
663 peer_session = find_session(plugin, target);
664 if (peer_session == NULL) /* We have a new peer to add */
667 * The first time, we can assume we have no knowledge of a
668 * working port for this peer, call the ICMP/UDP message sender
671 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
672 peer_session->connect_addr = GNUNET_malloc(addrlen);
673 memcpy(peer_session->connect_addr, addr, addrlen);
674 peer_session->connect_alen = addrlen;
675 peer_session->plugin = plugin;
676 peer_session->sock = NULL;
677 memcpy(&peer_session->target, target, sizeof(struct GNUNET_PeerIdentity));
678 peer_session->expecting_welcome = GNUNET_YES;
680 peer_session->next = plugin->sessions;
681 plugin->sessions = peer_session;
683 peer_session->messages = GNUNET_malloc(sizeof(struct MessageQueue));
684 peer_session->messages->msgbuf = GNUNET_malloc(msgbuf_size);
685 memcpy(peer_session->messages->msgbuf, msgbuf, msgbuf_size);
686 peer_session->messages->msgbuf_size = msgbuf_size;
687 peer_session->messages->timeout = GNUNET_TIME_relative_to_absolute(timeout);
688 peer_session->messages->cont = cont;
689 peer_session->messages->cont_cls = cont_cls;
691 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
692 _("Other peer is NAT'd, set up peer session for peer %s\n"), GNUNET_i2s(target));
694 run_gnunet_nat_client(plugin, addr, addrlen);
698 if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */
700 sent = udp_real_send(cls, peer_session->sock, target, msgbuf, msgbuf_size, priority, timeout, peer_session->connect_addr, peer_session->connect_alen, cont, cont_cls);
702 else /* Haven't gotten a response from this peer, queue message */
704 temp_message = GNUNET_malloc(sizeof(struct MessageQueue));
705 temp_message->msgbuf = GNUNET_malloc(msgbuf_size);
706 memcpy(temp_message->msgbuf, msgbuf, msgbuf_size);
707 temp_message->msgbuf_size = msgbuf_size;
708 temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout);
709 temp_message->cont = cont;
710 temp_message->cont_cls = cont_cls;
711 temp_message->next = peer_session->messages;
712 peer_session->messages = temp_message;
716 else if (other_peer_natd == GNUNET_NO) /* Other peer not behind a NAT, so we can just send the message as is */
718 sent = udp_real_send(cls, udp_sock.desc, target, msgbuf, msgbuf_size, priority, timeout, addr, addrlen, cont, cont_cls);
720 else /* Other peer is NAT'd, but we don't want to play with them (or can't!) */
721 return GNUNET_SYSERR;
723 /* When GNUNET_SYSERR is returned from udp_real_send, we will still call
724 * the callback so must not return GNUNET_SYSERR!
725 * If we do, then transport context get freed twice. */
726 if (sent == GNUNET_SYSERR)
734 * Add the IP of our network interface to the list of
735 * our external IP addresses.
738 process_interfaces (void *cls,
741 const struct sockaddr *addr, socklen_t addrlen)
743 struct Plugin *plugin = cls;
745 struct sockaddr_in *v4;
746 struct sockaddr_in6 *v6;
747 struct sockaddr *addr_nat;
750 af = addr->sa_family;
753 v4 = (struct sockaddr_in *) addr;
754 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
756 v4->sin_port = htons (DEFAULT_NAT_PORT); /* Indicates to receiver we are behind NAT */
758 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
760 addr_nat = GNUNET_malloc(addrlen);
761 memcpy(addr_nat, addr, addrlen);
762 v4 = (struct sockaddr_in *) addr_nat;
763 v4->sin_port = htons(plugin->port);
767 v4->sin_port = htons (plugin->port);
772 GNUNET_assert (af == AF_INET6);
773 v6 = (struct sockaddr_in6 *) addr;
774 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
776 v6->sin6_port = htons (0);
778 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
780 addr_nat = GNUNET_malloc(addrlen);
781 memcpy(addr_nat, addr, addrlen);
782 v6 = (struct sockaddr_in6 *) addr_nat;
783 v6->sin6_port = htons(plugin->port);
787 v6->sin6_port = htons (plugin->port);
791 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
792 GNUNET_ERROR_TYPE_BULK,
793 "udp", _("Found address `%s' (%s)\n"),
794 GNUNET_a2s (addr, addrlen), name);
796 if (addr_nat != NULL)
798 plugin->env->notify_address (plugin->env->cls,
800 addr_nat, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
801 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
802 GNUNET_ERROR_TYPE_BULK,
803 "udp", _("Found NAT address `%s' (%s)\n"),
804 GNUNET_a2s (addr_nat, addrlen), name);
805 GNUNET_free(addr_nat);
808 plugin->env->notify_address (plugin->env->cls,
810 addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
817 * Function called by the resolver for each address obtained from DNS
818 * for our own hostname. Add the addresses to the list of our
819 * external IP addresses.
822 * @param addr one of the addresses of the host, NULL for the last address
823 * @param addrlen length of the address
826 process_hostname_ips (void *cls,
827 const struct sockaddr *addr, socklen_t addrlen)
829 struct Plugin *plugin = cls;
833 plugin->hostname_dns = NULL;
836 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
841 * Send UDP probe messages or UDP keepalive messages, depending on the
842 * state of the connection.
844 * @param cls closure for this call (should be the main Plugin)
845 * @param tc task context for running this
848 send_udp_probe_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
850 struct UDP_NAT_Probes *probe = cls;
851 struct UDP_NAT_ProbeMessage *message;
852 struct Plugin *plugin = probe->plugin;
854 message = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessage));
855 message->header.size = htons(sizeof(struct UDP_NAT_ProbeMessage));
856 message->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE);
857 /* If they gave us a port, use that. If not, try our port. */
858 if (probe->port != 0)
859 probe->sock_addr.sin_port = htons(probe->port);
861 probe->sock_addr.sin_port = htons(plugin->port);
864 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
865 _("Sending a probe to port %d\n"), ntohs(probe->sock_addr.sin_port));
870 udp_real_send(plugin, udp_sock.desc, NULL,
871 (char *)message, ntohs(message->header.size), 0,
872 GNUNET_TIME_relative_get_unit(),
873 &probe->sock_addr, sizeof(probe->sock_addr),
874 &udp_probe_continuation, probe);
876 GNUNET_free(message);
881 * Continuation for probe sends. If the last probe was sent
882 * "successfully", schedule sending of another one. If not,
886 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result)
888 struct UDP_NAT_Probes *probe = cls;
889 struct Plugin *plugin = probe->plugin;
891 if ((result == GNUNET_OK) && (probe->count < MAX_PROBES))
894 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
895 _("Scheduling next probe for 10000 milliseconds\n"));
897 probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 10000), &send_udp_probe_message, probe);
899 else /* Destroy the probe context. */
902 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
903 _("Sending probe didn't go well...\n"));
909 * Find probe message by address
911 * @param plugin the plugin for this transport
912 * @param address_string the ip address as a string
914 struct UDP_NAT_Probes *
915 find_probe(struct Plugin *plugin, char * address_string)
917 struct UDP_NAT_Probes *pos;
919 pos = plugin->probes;
921 if (strcmp(pos->address_string, address_string) == 0)
929 * @param cls the plugin handle
930 * @param tc the scheduling context (for rescheduling this function again)
932 * We have been notified that gnunet-nat-server has written something to stdout.
933 * Handle the output, then reschedule this function to be called again once
938 udp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
940 struct Plugin *plugin = cls;
943 memset(&mybuf, 0, sizeof(mybuf));
945 struct UDP_NAT_Probes *temp_probe;
948 struct sockaddr_in in_addr;
950 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
953 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
958 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
959 _("Finished reading from server stdout with code: %d\n"), bytes);
966 for (i = 0; i < sizeof(mybuf); i++)
968 if (mybuf[i] == '\n')
971 if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
974 port_start = &mybuf[i + 1];
978 if (port_start != NULL)
979 port = atoi(port_start);
982 plugin->server_read_task =
983 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
984 GNUNET_TIME_UNIT_FOREVER_REL,
985 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
990 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
991 _("nat-server-read read: %s port %d\n"), &mybuf, port);
995 * We have received an ICMP response, ostensibly from a non-NAT'd peer
996 * that wants to connect to us! Send a message to establish a connection.
998 if (inet_pton(AF_INET, &mybuf[0], &in_addr.sin_addr) != 1)
1001 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp",
1002 _("nat-server-read malformed address\n"), &mybuf, port);
1004 plugin->server_read_task =
1005 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1006 GNUNET_TIME_UNIT_FOREVER_REL,
1007 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1011 temp_probe = find_probe(plugin, &mybuf[0]);
1013 if (temp_probe == NULL)
1015 temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes));
1016 temp_probe->address_string = strdup(&mybuf[0]);
1017 temp_probe->sock_addr.sin_family = AF_INET;
1018 GNUNET_assert(inet_pton(AF_INET, &mybuf[0], &temp_probe->sock_addr.sin_addr) == 1);
1019 temp_probe->port = port;
1020 temp_probe->next = plugin->probes;
1021 temp_probe->plugin = plugin;
1022 temp_probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 500), &send_udp_probe_message, temp_probe);
1023 plugin->probes = temp_probe;
1026 plugin->server_read_task =
1027 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1028 GNUNET_TIME_UNIT_FOREVER_REL,
1029 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1035 * Demultiplexer for UDP NAT messages
1037 * @param plugin the main plugin for this transport
1038 * @param sender from which peer the message was received
1039 * @param currhdr pointer to the header of the message
1040 * @param sender_addr the address from which the message was received
1041 * @param fromlen the length of the address
1042 * @param sockinfo which socket did we receive the message on
1045 udp_demultiplexer(struct Plugin *plugin, struct GNUNET_PeerIdentity *sender, const struct GNUNET_MessageHeader *currhdr, struct sockaddr_storage *sender_addr, socklen_t fromlen, struct UDP_Sock_Info *sockinfo)
1047 struct UDP_NAT_ProbeMessageReply *outgoing_probe_reply;
1048 struct UDP_NAT_ProbeMessageConfirmation *outgoing_probe_confirmation;
1050 char addr_buf[INET_ADDRSTRLEN];
1051 struct UDP_NAT_Probes *outgoing_probe;
1052 struct PeerSession *peer_session;
1053 struct MessageQueue *pending_message;
1054 struct MessageQueue *pending_message_temp;
1056 if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
1059 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1060 _("Received a message from myself, dropping!!!\n"));
1065 switch (ntohs(currhdr->type))
1067 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE:
1068 /* Send probe reply */
1069 outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply));
1070 outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply));
1071 outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY);
1074 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1075 _("Received a probe on listen port %d, sent_from port %d\n"), sockinfo->port, ntohs(((struct sockaddr_in *)sender_addr)->sin_port));
1078 udp_real_send(plugin, sockinfo->desc, NULL,
1079 (char *)outgoing_probe_reply,
1080 ntohs(outgoing_probe_reply->header.size), 0,
1081 GNUNET_TIME_relative_get_unit(),
1082 sender_addr, fromlen,
1086 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1087 _("Sent PROBE REPLY to port %d on outgoing port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1089 GNUNET_free(outgoing_probe_reply);
1091 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY:
1092 /* Check for existing probe, check ports returned, send confirmation if all is well */
1094 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1095 _("Received PROBE REPLY from port %d on incoming port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1097 if (sender_addr->ss_family == AF_INET)
1099 memset(&addr_buf, 0, sizeof(addr_buf));
1100 if (NULL == inet_ntop (AF_INET,
1101 &((struct sockaddr_in *) sender_addr)->sin_addr, addr_buf,
1104 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
1107 outgoing_probe = find_probe(plugin, &addr_buf[0]);
1108 if (outgoing_probe != NULL)
1111 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1112 _("Sending confirmation that we were reached!\n"));
1114 outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1115 outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1116 outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM);
1118 udp_real_send(plugin, sockinfo->desc, NULL, (char *)outgoing_probe_confirmation, ntohs(outgoing_probe_confirmation->header.size), 0, GNUNET_TIME_relative_get_unit(), sender_addr, fromlen, NULL, NULL);
1120 if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK)
1122 GNUNET_SCHEDULER_cancel(plugin->env->sched, outgoing_probe->task);
1123 outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK;
1124 /* Schedule task to timeout and remove probe if confirmation not received */
1126 GNUNET_free(outgoing_probe_confirmation);
1131 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1132 _("Received a probe reply, but have no record of a sent probe!\n"));
1137 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM:
1138 peer_session = find_session(plugin, sender);
1140 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1141 _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
1143 if (peer_session == NULL) /* Shouldn't this NOT happen? */
1146 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1147 _("Peer not in list, adding (THIS MAY BE A MISTAKE) %s\n"), GNUNET_i2s(sender));
1149 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
1150 peer_session->connect_addr = GNUNET_malloc(fromlen);
1151 memcpy(peer_session->connect_addr, sender_addr, fromlen);
1152 peer_session->connect_alen = fromlen;
1153 peer_session->plugin = plugin;
1154 peer_session->sock = sockinfo->desc;
1155 memcpy(&peer_session->target, sender, sizeof(struct GNUNET_PeerIdentity));
1156 peer_session->expecting_welcome = GNUNET_NO;
1158 peer_session->next = plugin->sessions;
1159 plugin->sessions = peer_session;
1161 peer_session->messages = NULL;
1163 else if (peer_session->expecting_welcome == GNUNET_YES)
1165 peer_session->expecting_welcome = GNUNET_NO;
1166 peer_session->sock = sockinfo->desc;
1167 ((struct sockaddr_in *)peer_session->connect_addr)->sin_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1169 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1170 _("Received a probe confirmation, will send to peer on port %d\n"), ntohs(((struct sockaddr_in *)peer_session->connect_addr)->sin_port));
1172 if (peer_session->messages != NULL)
1175 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1176 _("Received a probe confirmation, sending queued messages.\n"));
1178 pending_message = peer_session->messages;
1180 while (pending_message != NULL)
1183 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1184 _("sending queued message %d\n"), count);
1186 udp_real_send(plugin, peer_session->sock, &peer_session->target, pending_message->msgbuf, pending_message->msgbuf_size, 0, GNUNET_TIME_relative_get_unit(), peer_session->connect_addr, peer_session->connect_alen, pending_message->cont, pending_message->cont_cls);
1187 pending_message_temp = pending_message;
1188 pending_message = pending_message->next;
1189 GNUNET_free(pending_message_temp->msgbuf);
1190 GNUNET_free(pending_message_temp);
1192 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1193 _("finished sending queued message %d\n"), count);
1203 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1204 _("Received probe confirmation for already confirmed peer!\n"));
1207 /* Received confirmation, add peer with address/port specified */
1209 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE:
1210 /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */
1211 /* If we receive these just ignore! */
1214 plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE,
1215 NULL, (char *)sender_addr, fromlen);
1222 * @param cls the plugin handle
1223 * @param tc the scheduling context (for rescheduling this function again)
1225 * We have been notified that our writeset has something to read. We don't
1226 * know which socket needs to be read, so we have to check each one
1227 * Then reschedule this function to be called again once more is available.
1231 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1233 struct Plugin *plugin = cls;
1235 struct UDPMessage *msg;
1236 struct GNUNET_PeerIdentity *sender;
1237 unsigned int buflen;
1239 struct sockaddr_storage addr;
1245 const struct GNUNET_MessageHeader *currhdr;
1247 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1249 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1255 buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock.desc);
1257 if (buflen == GNUNET_NO)
1260 buf = GNUNET_malloc (buflen);
1261 fromlen = sizeof (addr);
1262 memset (&addr, 0, fromlen);
1264 GNUNET_NETWORK_socket_recvfrom (udp_sock.desc, buf, buflen,
1265 (struct sockaddr *) &addr, &fromlen);
1268 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1269 ("socket_recv returned %u, src_addr_len is %u\n"), ret,
1278 msg = (struct UDPMessage *) buf;
1281 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1282 ("header reports message size of %d, type %d\n"),
1283 ntohs (msg->header.size), ntohs (msg->header.type));
1285 if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
1291 msgbuf = (char *)&msg[1];
1292 sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1293 memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1297 tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
1299 while (offset < tsize)
1301 currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
1303 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1304 ("processing msg %d: type %d, size %d at offset %d\n"),
1305 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1307 udp_demultiplexer(plugin, sender, currhdr, &addr, fromlen, &udp_sock);
1309 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1310 ("processing done msg %d: type %d, size %d at offset %d\n"),
1311 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1313 offset += ntohs(currhdr->size);
1316 GNUNET_free_non_null (buf);
1317 GNUNET_free_non_null (sender);
1320 plugin->select_task =
1321 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1322 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1323 GNUNET_SCHEDULER_NO_TASK,
1324 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1325 NULL, &udp_plugin_select, plugin);
1330 * Create a slew of UDP sockets. If possible, use IPv6, otherwise
1333 * @param cls closure for server start, should be a struct Plugin *
1335 * @return number of sockets created or GNUNET_SYSERR on error
1338 udp_transport_server_start (void *cls)
1340 struct Plugin *plugin = cls;
1341 struct sockaddr_in serverAddrv4;
1342 struct sockaddr_in6 serverAddrv6;
1343 struct sockaddr *serverAddr;
1345 int sockets_created;
1347 sockets_created = 0;
1349 if (plugin->behind_nat == GNUNET_YES)
1351 /* Pipe to read from started processes stdout (on read end) */
1352 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
1353 if (plugin->server_stdout == NULL)
1354 return sockets_created;
1356 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1358 "Starting gnunet-nat-server process cmd: %s %s\n", "gnunet-nat-server", plugin->internal_address);
1360 /* Start the server process */
1361 plugin->server_pid = GNUNET_OS_start_process(NULL, plugin->server_stdout, "gnunet-nat-server", "gnunet-nat-server", plugin->internal_address, NULL);
1362 if (plugin->server_pid == GNUNET_SYSERR)
1365 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1367 "Failed to start gnunet-nat-server process\n");
1369 return GNUNET_SYSERR;
1371 /* Close the write end of the read pipe */
1372 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
1374 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
1375 plugin->server_read_task =
1376 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1377 GNUNET_TIME_UNIT_FOREVER_REL,
1378 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1381 udp_sock.desc = NULL;
1384 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
1385 if (NULL == udp_sock.desc)
1387 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
1388 return sockets_created;
1392 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1393 #if HAVE_SOCKADDR_IN_SIN_LEN
1394 serverAddrv4.sin_len = sizeof (serverAddrv4);
1396 serverAddrv4.sin_family = AF_INET;
1397 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1398 serverAddrv4.sin_port = htons (plugin->port);
1399 addrlen = sizeof (serverAddrv4);
1400 serverAddr = (struct sockaddr *) &serverAddrv4;
1402 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1404 "Binding to port %d\n", ntohs(serverAddrv4.sin_port));
1406 while (GNUNET_NETWORK_socket_bind (udp_sock.desc, serverAddr, addrlen) !=
1409 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1411 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1413 "Binding failed, trying new port %d\n", ntohs(serverAddrv4.sin_port));
1416 udp_sock.port = ntohs(serverAddrv4.sin_port);
1421 if ((udp_sock.desc == NULL) && (GNUNET_YES !=
1422 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
1425 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
1426 if (udp_sock.desc != NULL)
1428 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1429 #if HAVE_SOCKADDR_IN_SIN_LEN
1430 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1432 serverAddrv6.sin6_family = AF_INET6;
1433 serverAddrv6.sin6_addr = in6addr_any;
1434 serverAddrv6.sin6_port = htons (plugin->port);
1435 addrlen = sizeof (serverAddrv6);
1436 serverAddr = (struct sockaddr *) &serverAddrv6;
1441 plugin->rs = GNUNET_NETWORK_fdset_create ();
1443 GNUNET_NETWORK_fdset_zero (plugin->rs);
1446 GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock.desc);
1448 plugin->select_task =
1449 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1450 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1451 GNUNET_SCHEDULER_NO_TASK,
1452 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1453 NULL, &udp_plugin_select, plugin);
1455 return sockets_created;
1460 * Another peer has suggested an address for this peer and transport
1461 * plugin. Check that this could be a valid address. This function
1462 * is not expected to 'validate' the address in the sense of trying to
1463 * connect to it but simply to see if the binary format is technically
1464 * legal for establishing a connection.
1466 * @param cls closure, should be our handle to the Plugin
1467 * @param addr pointer to the address, may be modified (slightly)
1468 * @param addrlen length of addr
1469 * @return GNUNET_OK if this is a plausible address for this peer
1470 * and transport, GNUNET_SYSERR if not
1474 udp_check_address (void *cls, void *addr, size_t addrlen)
1476 struct Plugin *plugin = cls;
1477 char buf[sizeof (struct sockaddr_in6)];
1479 struct sockaddr_in *v4;
1480 struct sockaddr_in6 *v6;
1482 if ((addrlen != sizeof (struct sockaddr_in)) &&
1483 (addrlen != sizeof (struct sockaddr_in6)))
1485 GNUNET_break_op (0);
1486 return GNUNET_SYSERR;
1488 memcpy (buf, addr, sizeof (struct sockaddr_in6));
1489 if (addrlen == sizeof (struct sockaddr_in))
1491 v4 = (struct sockaddr_in *) buf;
1492 v4->sin_port = htons (plugin->port);
1496 v6 = (struct sockaddr_in6 *) buf;
1497 v6->sin6_port = htons (plugin->port);
1501 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1503 "Informing transport service about my address `%s'.\n",
1504 GNUNET_a2s (addr, addrlen));
1511 * Append our port and forward the result.
1514 append_port (void *cls, const char *hostname)
1516 struct PrettyPrinterContext *ppc = cls;
1519 if (hostname == NULL)
1521 ppc->asc (ppc->asc_cls, NULL);
1525 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1526 ppc->asc (ppc->asc_cls, ret);
1532 * Convert the transports address to a nice, human-readable
1535 * @param cls closure
1536 * @param type name of the transport that generated the address
1537 * @param addr one of the addresses of the host, NULL for the last address
1538 * the specific address format depends on the transport
1539 * @param addrlen length of the address
1540 * @param numeric should (IP) addresses be displayed in numeric form?
1541 * @param timeout after how long should we give up?
1542 * @param asc function to call on each string
1543 * @param asc_cls closure for asc
1546 udp_plugin_address_pretty_printer (void *cls,
1551 struct GNUNET_TIME_Relative timeout,
1552 GNUNET_TRANSPORT_AddressStringCallback asc,
1555 struct Plugin *plugin = cls;
1556 const struct sockaddr_in *v4;
1557 const struct sockaddr_in6 *v6;
1558 struct PrettyPrinterContext *ppc;
1560 if ((addrlen != sizeof (struct sockaddr_in)) &&
1561 (addrlen != sizeof (struct sockaddr_in6)))
1563 /* invalid address */
1564 GNUNET_break_op (0);
1565 asc (asc_cls, NULL);
1568 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1570 ppc->asc_cls = asc_cls;
1571 if (addrlen == sizeof (struct sockaddr_in))
1573 v4 = (const struct sockaddr_in *) addr;
1574 ppc->port = ntohs (v4->sin_port);
1578 v6 = (const struct sockaddr_in6 *) addr;
1579 ppc->port = ntohs (v6->sin6_port);
1582 GNUNET_RESOLVER_hostname_get (plugin->env->sched,
1586 !numeric, timeout, &append_port, ppc);
1590 * Return the actual path to a file found in the current
1591 * PATH environment variable.
1593 * @param binary the name of the file to find
1596 get_path_from_PATH (char *binary)
1604 p = getenv ("PATH");
1607 path = GNUNET_strdup (p); /* because we write on it */
1608 buf = GNUNET_malloc (strlen (path) + 20);
1611 while (NULL != (end = strchr (pos, ':')))
1614 sprintf (buf, "%s/%s", pos, binary);
1615 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1622 sprintf (buf, "%s/%s", pos, binary);
1623 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1634 * Check whether the suid bit is set on a file.
1635 * Attempts to find the file using the current
1636 * PATH environment variable as a search path.
1638 * @param binary the name of the file to check
1641 check_gnunet_nat_binary(char *binary)
1643 struct stat statbuf;
1646 p = get_path_from_PATH (binary);
1649 if (0 != STAT (p, &statbuf))
1652 return GNUNET_SYSERR;
1655 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
1656 (statbuf.st_uid == 0) )
1662 * The exported method. Makes the core api available via a global and
1663 * returns the udp transport API.
1666 libgnunet_plugin_transport_udp_init (void *cls)
1668 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1669 unsigned long long mtu;
1670 unsigned long long port;
1671 struct GNUNET_TRANSPORT_PluginFunctions *api;
1672 struct Plugin *plugin;
1673 struct GNUNET_SERVICE_Context *service;
1674 int sockets_created;
1677 int only_nat_addresses;
1678 char *internal_address;
1679 char *external_address;
1680 struct sockaddr_in in_addr;
1682 service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
1683 if (service == NULL)
1685 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", _
1686 ("Failed to start service for `%s' transport plugin.\n"),
1691 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1695 /* We are behind nat (according to the user) */
1696 if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
1697 behind_nat = GNUNET_YES;
1700 behind_nat = GNUNET_NO;
1701 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", "Configuration specified you are behind a NAT, but gnunet-nat-server is not installed properly (suid bit not set)!\n");
1705 behind_nat = GNUNET_NO; /* We are not behind nat! */
1707 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1711 if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
1712 allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
1715 allow_nat = GNUNET_NO;
1716 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", "Configuration specified you want to connect to NAT'd peers, but gnunet-nat-client is not installed properly (suid bit not set)!\n");
1721 allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
1723 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1725 "ONLY_NAT_ADDRESSES"))
1726 only_nat_addresses = GNUNET_YES; /* We will only report our addresses as NAT'd */
1728 only_nat_addresses = GNUNET_NO; /* We will report our addresses as NAT'd and non-NAT'd */
1730 external_address = NULL;
1731 if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
1732 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1735 &external_address)))
1737 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1740 ("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
1742 GNUNET_SERVICE_stop (service);
1746 if ((external_address != NULL) && (inet_pton(AF_INET, external_address, &in_addr.sin_addr) != 1))
1748 GNUNET_log_from(GNUNET_ERROR_TYPE_WARNING, "udp", "Malformed EXTERNAL_ADDRESS %s given in configuration!\n", external_address);
1751 internal_address = NULL;
1752 if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
1753 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1756 &internal_address)))
1758 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1761 ("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
1763 GNUNET_SERVICE_stop (service);
1764 GNUNET_free_non_null(external_address);
1768 if ((internal_address != NULL) && (inet_pton(AF_INET, internal_address, &in_addr.sin_addr) != 1))
1770 GNUNET_log_from(GNUNET_ERROR_TYPE_WARNING, "udp", "Malformed INTERNAL_ADDRESS %s given in configuration!\n", internal_address);
1774 GNUNET_CONFIGURATION_get_value_number (env->cfg,
1778 port = UDP_NAT_DEFAULT_PORT;
1779 else if (port > 65535)
1781 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
1783 _("Given `%s' option is out of range: %llu > %u\n"),
1787 GNUNET_SERVICE_stop (service);
1788 GNUNET_free_non_null(external_address);
1789 GNUNET_free_non_null(internal_address);
1795 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
1797 _("MTU %llu for `%s' is probably too low!\n"), mtu,
1800 plugin = GNUNET_malloc (sizeof (struct Plugin));
1801 plugin->external_address = external_address;
1802 plugin->internal_address = internal_address;
1803 plugin->port = port;
1804 plugin->behind_nat = behind_nat;
1805 plugin->allow_nat = allow_nat;
1806 plugin->only_nat_addresses = only_nat_addresses;
1809 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1812 api->send = &udp_plugin_send;
1813 api->disconnect = &udp_disconnect;
1814 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1815 api->check_address = &udp_check_address;
1817 plugin->service = service;
1819 if (plugin->behind_nat == GNUNET_NO)
1821 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
1824 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
1827 HOSTNAME_RESOLVE_TIMEOUT,
1828 &process_hostname_ips,
1831 if ((plugin->behind_nat == GNUNET_YES) && (inet_pton(AF_INET, plugin->external_address, &in_addr.sin_addr) == 1))
1833 in_addr.sin_port = htons(0);
1834 in_addr.sin_family = AF_INET;
1835 plugin->env->notify_address (plugin->env->cls,
1837 &in_addr, sizeof(in_addr), GNUNET_TIME_UNIT_FOREVER_REL);
1839 else if ((plugin->external_address != NULL) && (inet_pton(AF_INET, plugin->external_address, &in_addr.sin_addr) == 1))
1841 in_addr.sin_port = htons(plugin->port);
1842 in_addr.sin_family = AF_INET;
1843 plugin->env->notify_address (plugin->env->cls,
1845 &in_addr, sizeof(in_addr), GNUNET_TIME_UNIT_FOREVER_REL);
1848 sockets_created = udp_transport_server_start (plugin);
1850 GNUNET_assert (sockets_created == 1);
1856 libgnunet_plugin_transport_udp_done (void *cls)
1858 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1859 struct Plugin *plugin = api->cls;
1861 udp_transport_server_stop (plugin);
1862 if (NULL != plugin->hostname_dns)
1864 GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
1865 plugin->hostname_dns = NULL;
1868 GNUNET_SERVICE_stop (plugin->service);
1870 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1871 GNUNET_free (plugin);
1876 /* end of plugin_transport_udp.c */