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_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
65 * Handle for request of hostname resolution, non-NULL if pending.
67 static struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
70 * How long until we give up on transmitting the welcome message?
72 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
75 * Starting port for listening and sending, eventually a config value
77 #define UDP_NAT_DEFAULT_PORT 22086
80 * UDP Message-Packet header.
87 struct GNUNET_MessageHeader header;
90 * What is the identity of the sender (GNUNET_hash of public key)
92 struct GNUNET_PeerIdentity sender;
97 /* Forward definition */
100 struct PrettyPrinterContext
102 GNUNET_TRANSPORT_AddressStringCallback asc;
112 struct MessageQueue *next;
115 * Session this message belongs to
117 struct PeerSession *session;
120 * Actual message to be sent
125 * Size of message buffer to be sent
130 * When to discard this message
132 struct GNUNET_TIME_Absolute timeout;
135 * Continuation to call when this message goes out
137 GNUNET_TRANSPORT_TransmitContinuation cont;
140 * closure for continuation
147 * UDP NAT Probe message definition
149 struct UDP_NAT_ProbeMessage
154 struct GNUNET_MessageHeader header;
159 * UDP NAT Probe message reply definition
161 struct UDP_NAT_ProbeMessageReply
166 struct GNUNET_MessageHeader header;
172 * UDP NAT Probe message confirm definition
174 struct UDP_NAT_ProbeMessageConfirmation
179 struct GNUNET_MessageHeader header;
192 * Stored in a linked list.
194 struct PeerSession *next;
197 * Pointer to the global plugin struct.
199 struct Plugin *plugin;
202 * To whom are we talking to (set to our identity
203 * if we are still waiting for the welcome message)
205 struct GNUNET_PeerIdentity target;
208 * Address of the other peer (either based on our 'connect'
209 * call or on our 'accept' call).
214 * Length of connect_addr.
219 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
221 int expecting_welcome;
224 * From which socket do we need to send to this peer?
226 struct GNUNET_NETWORK_Handle *sock;
229 * Queue of messages for this peer, in the case that
230 * we have to await a connection...
232 struct MessageQueue *messages;
236 struct UDP_NAT_Probes
242 struct UDP_NAT_Probes *next;
245 * Address string that the server process returned to us
247 char *address_string;
250 * Timeout for this set of probes
252 struct GNUNET_TIME_Absolute timeout;
255 * Count of how many probes we've attempted
260 * The plugin this probe belongs to
262 struct Plugin *plugin;
265 * The task used to send these probes
267 GNUNET_SCHEDULER_TaskIdentifier task;
270 * Network address (always ipv4)
272 struct sockaddr_in sock_addr;
275 * The port to send this probe to, 0 to choose randomly
283 * Encapsulation of all of the state of the plugin.
290 struct GNUNET_TRANSPORT_PluginEnvironment *env;
293 * Handle to the network service.
295 struct GNUNET_SERVICE_Context *service;
298 * Session of peers with whom we are currently connected
300 struct PeerSession *sessions;
303 * Handle for request of hostname resolution, non-NULL if pending.
305 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
308 * ID of task used to update our addresses when one expires.
310 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
315 GNUNET_SCHEDULER_TaskIdentifier select_task;
323 * The external address given to us by the user. Must be actual
324 * outside visible address for NAT punching to work.
326 char *external_address;
329 * The internal address given to us by the user (or discovered).
331 char *internal_address;
336 struct GNUNET_NETWORK_FDSet *rs;
339 * stdout pipe handle for the gnunet-nat-server process
341 struct GNUNET_DISK_PipeHandle *server_stdout;
344 * stdout file handle (for reading) for the gnunet-nat-server process
346 const struct GNUNET_DISK_FileHandle *server_stdout_handle;
349 * ID of select gnunet-nat-server stdout read task
351 GNUNET_SCHEDULER_TaskIdentifier server_read_task;
354 * Is this transport configured to be behind a NAT?
359 * Is this transport configured to allow connections to NAT'd peers?
364 * Should this transport advertise only NAT addresses (port set to 0)?
365 * If not, all addresses will be duplicated for NAT punching and regular
368 int only_nat_addresses;
371 * The process id of the server process (if behind NAT)
378 struct UDP_NAT_Probes *probes;
385 /* The network handle */
386 struct GNUNET_NETWORK_Handle *desc;
388 /* The port we bound to */
392 /* *********** globals ************* */
395 * the socket that we transmit all data with
397 static struct UDP_Sock_Info udp_sock;
401 * Forward declaration.
404 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result);
408 * Disconnect from a remote node. Clean up session if we have one for this peer
410 * @param cls closure for this call (should be handle to Plugin)
411 * @param target the peeridentity of the peer to disconnect
412 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
415 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
417 /** TODO: Implement! */
422 * Shutdown the server process (stop receiving inbound traffic). Maybe
425 * @param cls Handle to the plugin for this transport
427 * @return returns the number of sockets successfully closed,
428 * should equal the number of sockets successfully opened
431 udp_transport_server_stop (void *cls)
433 struct Plugin *plugin = cls;
438 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
440 GNUNET_SCHEDULER_cancel (plugin->env->sched, plugin->select_task);
441 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
444 ok = GNUNET_NETWORK_socket_close (udp_sock.desc);
446 udp_sock.desc = NULL;
449 if (plugin->behind_nat == GNUNET_YES)
451 if (0 != PLIBC_KILL (plugin->server_pid, SIGTERM))
453 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
455 GNUNET_OS_process_wait (plugin->server_pid);
458 if (ret != GNUNET_OK)
459 return GNUNET_SYSERR;
465 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
467 struct PeerSession *pos;
469 pos = plugin->sessions;
472 if (memcmp(&pos->target, peer, sizeof(struct GNUNET_PeerIdentity)) == 0)
482 * Actually send out the message, assume we've got the address and
483 * send_handle squared away!
486 * @param send_handle which handle to send message on
487 * @param target who should receive this message (ignored by UDP)
488 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
489 * @param msgbuf_size the size of the msgbuf to send
490 * @param priority how important is the message (ignored by UDP)
491 * @param timeout when should we time out (give up) if we can not transmit?
492 * @param addr the addr to send the message to, needs to be a sockaddr for us
493 * @param addrlen the len of addr
494 * @param cont continuation to call once the message has
495 * been transmitted (or if the transport is ready
496 * for the next transmission call; or if the
497 * peer disconnected...)
498 * @param cont_cls closure for cont
499 * @return the number of bytes written
502 udp_real_send (void *cls,
503 struct GNUNET_NETWORK_Handle *send_handle,
504 const struct GNUNET_PeerIdentity *target,
507 unsigned int priority,
508 struct GNUNET_TIME_Relative timeout,
511 GNUNET_TRANSPORT_TransmitContinuation cont,
514 struct Plugin *plugin = cls;
515 struct UDPMessage *message;
519 if ((addr == NULL) || (addrlen == 0))
522 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
523 ("udp_plugin_send called without address, returning!\n"));
526 cont (cont_cls, target, GNUNET_SYSERR);
527 return 0; /* Can never send if we don't have an address!! */
530 /* Build the message to be sent */
531 message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
532 ssize = sizeof (struct UDPMessage) + msgbuf_size;
534 message->header.size = htons (ssize);
535 message->header.type = htons (0);
536 memcpy (&message->sender, plugin->env->my_identity,
537 sizeof (struct GNUNET_PeerIdentity));
538 memcpy (&message[1], msgbuf, msgbuf_size);
540 /* Actually send the message */
542 GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
548 if (sent == GNUNET_SYSERR)
549 cont (cont_cls, target, GNUNET_SYSERR);
552 cont (cont_cls, target, GNUNET_OK);
556 GNUNET_free (message);
561 * We learned about a peer (possibly behind NAT) so run the
562 * gnunet-nat-client to send dummy ICMP responses
564 * @param plugin the plugin for this transport
565 * @param addr the address of the peer
566 * @param addrlen the length of the address
569 run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
571 char inet4[INET_ADDRSTRLEN];
572 char *address_as_string;
573 char *port_as_string;
575 const struct sockaddr *sa = (const struct sockaddr *)addr;
577 if (addrlen < sizeof (struct sockaddr))
579 switch (sa->sa_family)
582 if (addrlen != sizeof (struct sockaddr_in))
584 if (NULL == inet_ntop (AF_INET,
585 &((struct sockaddr_in *) sa)->sin_addr,
586 inet4, INET_ADDRSTRLEN))
588 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
591 address_as_string = GNUNET_strdup (inet4);
598 GNUNET_asprintf(&port_as_string, "%d", plugin->port);
600 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
601 _("Running gnunet-nat-client with arguments: %s %s %d\n"), plugin->external_address, address_as_string, plugin->port);
604 /* Start the server process */
605 pid = GNUNET_OS_start_process(NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, port_as_string, NULL);
606 GNUNET_free(address_as_string);
607 GNUNET_free(port_as_string);
608 GNUNET_OS_process_wait (pid);
612 * Function that can be used by the transport service to transmit
613 * a message using the plugin.
616 * @param target who should receive this message (ignored by UDP)
617 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
618 * @param msgbuf_size the size of the msgbuf to send
619 * @param priority how important is the message (ignored by UDP)
620 * @param timeout when should we time out (give up) if we can not transmit?
621 * @param session identifier used for this session (can be NULL)
622 * @param addr the addr to send the message to, needs to be a sockaddr for us
623 * @param addrlen the len of addr
624 * @param force_address not used, we had better have an address to send to
625 * because we are stateless!!
626 * @param cont continuation to call once the message has
627 * been transmitted (or if the transport is ready
628 * for the next transmission call; or if the
629 * peer disconnected...)
630 * @param cont_cls closure for cont
632 * @return the number of bytes written (may return 0 and the message can
633 * still be transmitted later!)
636 udp_plugin_send (void *cls,
637 const struct GNUNET_PeerIdentity *target,
640 unsigned int priority,
641 struct GNUNET_TIME_Relative timeout,
642 struct Session *session,
646 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
648 struct Plugin *plugin = cls;
650 struct MessageQueue *temp_message;
651 struct PeerSession *peer_session;
652 struct sockaddr_in *sockaddr = (struct sockaddr_in *)addr;
655 GNUNET_assert (NULL == session);
656 other_peer_natd = GNUNET_NO;
657 if ((sockaddr->sin_family == AF_INET) && (ntohs(sockaddr->sin_port) == 0))
659 other_peer_natd = GNUNET_YES;
664 if ((other_peer_natd == GNUNET_YES) && (plugin->allow_nat == GNUNET_YES))
666 peer_session = find_session(plugin, target);
667 if (peer_session == NULL) /* We have a new peer to add */
670 * The first time, we can assume we have no knowledge of a
671 * working port for this peer, call the ICMP/UDP message sender
674 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
675 peer_session->connect_addr = GNUNET_malloc(addrlen);
676 memcpy(peer_session->connect_addr, addr, addrlen);
677 peer_session->connect_alen = addrlen;
678 peer_session->plugin = plugin;
679 peer_session->sock = NULL;
680 memcpy(&peer_session->target, target, sizeof(struct GNUNET_PeerIdentity));
681 peer_session->expecting_welcome = GNUNET_YES;
683 peer_session->next = plugin->sessions;
684 plugin->sessions = peer_session;
686 peer_session->messages = GNUNET_malloc(sizeof(struct MessageQueue));
687 peer_session->messages->msgbuf = GNUNET_malloc(msgbuf_size);
688 memcpy(peer_session->messages->msgbuf, msgbuf, msgbuf_size);
689 peer_session->messages->msgbuf_size = msgbuf_size;
690 peer_session->messages->next = NULL;
691 peer_session->messages->timeout = GNUNET_TIME_relative_to_absolute(timeout);
692 peer_session->messages->cont = cont;
693 peer_session->messages->cont_cls = cont_cls;
695 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
696 _("Other peer is NAT'd, set up peer session for peer %s\n"), GNUNET_i2s(target));
698 run_gnunet_nat_client(plugin, addr, addrlen);
702 if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */
704 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);
706 else /* Haven't gotten a response from this peer, queue message */
708 temp_message = GNUNET_malloc(sizeof(struct MessageQueue));
709 temp_message->msgbuf = GNUNET_malloc(msgbuf_size);
710 memcpy(temp_message->msgbuf, msgbuf, msgbuf_size);
711 temp_message->msgbuf_size = msgbuf_size;
712 temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout);
713 temp_message->cont = cont;
714 temp_message->cont_cls = cont_cls;
715 temp_message->next = peer_session->messages;
716 peer_session->messages = temp_message;
720 else if (other_peer_natd == GNUNET_NO) /* Other peer not behind a NAT, so we can just send the message as is */
722 sent = udp_real_send(cls, udp_sock.desc, target, msgbuf, msgbuf_size, priority, timeout, addr, addrlen, cont, cont_cls);
724 else /* Other peer is NAT'd, but we don't want to play with them (or can't!) */
725 return GNUNET_SYSERR;
727 /* When GNUNET_SYSERR is returned from udp_real_send, we will still call
728 * the callback so must not return GNUNET_SYSERR!
729 * If we do, then transport context get freed twice. */
730 if (sent == GNUNET_SYSERR)
738 * Add the IP of our network interface to the list of
739 * our external IP addresses.
742 process_interfaces (void *cls,
745 const struct sockaddr *addr, socklen_t addrlen)
747 struct Plugin *plugin = cls;
749 struct sockaddr_in *v4;
750 struct sockaddr_in6 *v6;
751 struct sockaddr *addr_nat;
754 af = addr->sa_family;
757 v4 = (struct sockaddr_in *) addr;
758 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
760 v4->sin_port = htons (0); /* Indicates to receiver we are behind NAT */
762 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
764 addr_nat = GNUNET_malloc(addrlen);
765 memcpy(addr_nat, addr, addrlen);
766 v4 = (struct sockaddr_in *) addr_nat;
767 v4->sin_port = htons(plugin->port);
771 v4->sin_port = htons (plugin->port);
776 GNUNET_assert (af == AF_INET6);
777 v6 = (struct sockaddr_in6 *) addr;
778 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
780 v6->sin6_port = htons (0);
782 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
784 addr_nat = GNUNET_malloc(addrlen);
785 memcpy(addr_nat, addr, addrlen);
786 v6 = (struct sockaddr_in6 *) addr_nat;
787 v6->sin6_port = htons(plugin->port);
791 v6->sin6_port = htons (plugin->port);
795 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
796 GNUNET_ERROR_TYPE_BULK,
797 "udp", _("Found address `%s' (%s)\n"),
798 GNUNET_a2s (addr, addrlen), name);
800 if (addr_nat != NULL)
802 plugin->env->notify_address (plugin->env->cls,
804 addr_nat, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
805 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
806 GNUNET_ERROR_TYPE_BULK,
807 "udp", _("Found NAT address `%s' (%s)\n"),
808 GNUNET_a2s (addr_nat, addrlen), name);
809 GNUNET_free(addr_nat);
812 plugin->env->notify_address (plugin->env->cls,
814 addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
821 * Function called by the resolver for each address obtained from DNS
822 * for our own hostname. Add the addresses to the list of our
823 * external IP addresses.
826 * @param addr one of the addresses of the host, NULL for the last address
827 * @param addrlen length of the address
830 process_hostname_ips (void *cls,
831 const struct sockaddr *addr, socklen_t addrlen)
833 struct Plugin *plugin = cls;
837 plugin->hostname_dns = NULL;
840 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
845 * Send UDP probe messages or UDP keepalive messages, depending on the
846 * state of the connection.
848 * @param cls closure for this call (should be the main Plugin)
849 * @param tc task context for running this
852 send_udp_probe_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
854 struct UDP_NAT_Probes *probe = cls;
855 struct UDP_NAT_ProbeMessage *message;
856 struct Plugin *plugin = probe->plugin;
858 message = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessage));
859 message->header.size = htons(sizeof(struct UDP_NAT_ProbeMessage));
860 message->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE);
861 /* If they gave us a port, use that. If not, try our port. */
862 if (probe->port != 0)
863 probe->sock_addr.sin_port = htons(probe->port);
865 probe->sock_addr.sin_port = htons(plugin->port);
868 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
869 _("Sending a probe to port %d\n"), ntohs(probe->sock_addr.sin_port));
874 udp_real_send(plugin, udp_sock.desc, NULL,
875 (char *)message, ntohs(message->header.size), 0,
876 GNUNET_TIME_relative_get_unit(),
877 &probe->sock_addr, sizeof(probe->sock_addr),
878 &udp_probe_continuation, probe);
880 GNUNET_free(message);
885 * Continuation for probe sends. If the last probe was sent
886 * "successfully", schedule sending of another one. If not,
890 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result)
892 struct UDP_NAT_Probes *probe = cls;
893 struct Plugin *plugin = probe->plugin;
895 if ((result == GNUNET_OK) && (probe->count < MAX_PROBES))
898 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
899 _("Scheduling next probe for 10000 milliseconds\n"));
901 probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 10000), &send_udp_probe_message, probe);
903 else /* Destroy the probe context. */
906 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
907 _("Sending probe didn't go well...\n"));
913 * Find probe message by address
915 * @param plugin the plugin for this transport
916 * @param address_string the ip address as a string
918 struct UDP_NAT_Probes *
919 find_probe(struct Plugin *plugin, char * address_string)
921 struct UDP_NAT_Probes *pos;
923 pos = plugin->probes;
925 if (strcmp(pos->address_string, address_string) == 0)
933 * @param cls the plugin handle
934 * @param tc the scheduling context (for rescheduling this function again)
936 * We have been notified that gnunet-nat-server has written something to stdout.
937 * Handle the output, then reschedule this function to be called again once
942 udp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
944 struct Plugin *plugin = cls;
947 memset(&mybuf, 0, sizeof(mybuf));
949 struct UDP_NAT_Probes *temp_probe;
952 struct sockaddr_in in_addr;
954 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
957 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
962 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
963 _("Finished reading from server stdout with code: %d\n"), bytes);
970 for (i = 0; i < sizeof(mybuf); i++)
972 if (mybuf[i] == '\n')
975 if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
978 port_start = &mybuf[i + 1];
982 if (port_start != NULL)
983 port = atoi(port_start);
986 plugin->server_read_task =
987 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
988 GNUNET_TIME_UNIT_FOREVER_REL,
989 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
994 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
995 _("nat-server-read read: %s port %d\n"), &mybuf, port);
999 * We have received an ICMP response, ostensibly from a non-NAT'd peer
1000 * that wants to connect to us! Send a message to establish a connection.
1002 if (inet_pton(AF_INET, &mybuf[0], &in_addr.sin_addr) != 1)
1005 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp",
1006 _("nat-server-read malformed address\n"), &mybuf, port);
1008 plugin->server_read_task =
1009 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1010 GNUNET_TIME_UNIT_FOREVER_REL,
1011 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1015 temp_probe = find_probe(plugin, &mybuf[0]);
1017 if (temp_probe == NULL)
1019 temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes));
1020 temp_probe->address_string = strdup(&mybuf[0]);
1021 temp_probe->sock_addr.sin_family = AF_INET;
1022 GNUNET_assert(inet_pton(AF_INET, &mybuf[0], &temp_probe->sock_addr.sin_addr) == 1);
1023 temp_probe->port = port;
1024 temp_probe->next = plugin->probes;
1025 temp_probe->plugin = plugin;
1026 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);
1027 plugin->probes = temp_probe;
1030 plugin->server_read_task =
1031 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1032 GNUNET_TIME_UNIT_FOREVER_REL,
1033 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1039 * Demultiplexer for UDP NAT messages
1041 * @param plugin the main plugin for this transport
1042 * @param sender from which peer the message was received
1043 * @param currhdr pointer to the header of the message
1044 * @param sender_addr the address from which the message was received
1045 * @param fromlen the length of the address
1046 * @param sockinfo which socket did we receive the message on
1049 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)
1051 struct UDP_NAT_ProbeMessageReply *outgoing_probe_reply;
1052 struct UDP_NAT_ProbeMessageConfirmation *outgoing_probe_confirmation;
1054 char addr_buf[INET_ADDRSTRLEN];
1055 struct UDP_NAT_Probes *outgoing_probe;
1056 struct PeerSession *peer_session;
1057 struct MessageQueue *pending_message;
1058 struct MessageQueue *pending_message_temp;
1060 if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
1063 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1064 _("Received a message from myself, dropping!!!\n"));
1069 switch (ntohs(currhdr->type))
1071 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE:
1072 /* Send probe reply */
1073 outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply));
1074 outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply));
1075 outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY);
1078 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1079 _("Received a probe on listen port %d, sent_from port %d\n"), sockinfo->port, ntohs(((struct sockaddr_in *)sender_addr)->sin_port));
1082 udp_real_send(plugin, sockinfo->desc, NULL,
1083 (char *)outgoing_probe_reply,
1084 ntohs(outgoing_probe_reply->header.size), 0,
1085 GNUNET_TIME_relative_get_unit(),
1086 sender_addr, fromlen,
1090 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1091 _("Sent PROBE REPLY to port %d on outgoing port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1093 GNUNET_free(outgoing_probe_reply);
1095 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY:
1096 /* Check for existing probe, check ports returned, send confirmation if all is well */
1098 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1099 _("Received PROBE REPLY from port %d on incoming port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1101 if (sender_addr->ss_family == AF_INET)
1103 memset(&addr_buf, 0, sizeof(addr_buf));
1104 if (NULL == inet_ntop (AF_INET,
1105 &((struct sockaddr_in *) sender_addr)->sin_addr, addr_buf,
1108 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
1111 outgoing_probe = find_probe(plugin, &addr_buf[0]);
1112 if (outgoing_probe != NULL)
1115 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1116 _("Sending confirmation that we were reached!\n"));
1118 outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1119 outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1120 outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM);
1122 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);
1124 if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK)
1126 GNUNET_SCHEDULER_cancel(plugin->env->sched, outgoing_probe->task);
1127 outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK;
1128 /* Schedule task to timeout and remove probe if confirmation not received */
1130 GNUNET_free(outgoing_probe_confirmation);
1135 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1136 _("Received a probe reply, but have no record of a sent probe!\n"));
1141 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM:
1142 peer_session = find_session(plugin, sender);
1144 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1145 _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
1147 if (peer_session == NULL) /* Shouldn't this NOT happen? */
1150 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1151 _("Peer not in list, adding (THIS MAY BE A MISTAKE) %s\n"), GNUNET_i2s(sender));
1153 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
1154 peer_session->connect_addr = GNUNET_malloc(fromlen);
1155 memcpy(peer_session->connect_addr, sender_addr, fromlen);
1156 peer_session->connect_alen = fromlen;
1157 peer_session->plugin = plugin;
1158 peer_session->sock = sockinfo->desc;
1159 memcpy(&peer_session->target, sender, sizeof(struct GNUNET_PeerIdentity));
1160 peer_session->expecting_welcome = GNUNET_NO;
1162 peer_session->next = plugin->sessions;
1163 plugin->sessions = peer_session;
1165 peer_session->messages = NULL;
1167 else if (peer_session->expecting_welcome == GNUNET_YES)
1169 peer_session->expecting_welcome = GNUNET_NO;
1170 peer_session->sock = sockinfo->desc;
1171 ((struct sockaddr_in *)peer_session->connect_addr)->sin_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1173 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1174 _("Received a probe confirmation, will send to peer on port %d\n"), ntohs(((struct sockaddr_in *)peer_session->connect_addr)->sin_port));
1176 if (peer_session->messages != NULL)
1179 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1180 _("Received a probe confirmation, sending queued messages.\n"));
1182 pending_message = peer_session->messages;
1184 while (pending_message != NULL)
1187 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1188 _("sending queued message %d\n"), count);
1190 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);
1191 pending_message_temp = pending_message;
1192 pending_message = pending_message->next;
1193 GNUNET_free(pending_message_temp->msgbuf);
1194 GNUNET_free(pending_message_temp);
1196 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1197 _("finished sending queued message %d\n"), count);
1207 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1208 _("Received probe confirmation for already confirmed peer!\n"));
1211 /* Received confirmation, add peer with address/port specified */
1213 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE:
1214 /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */
1215 /* If we receive these just ignore! */
1218 plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE,
1219 NULL, (char *)sender_addr, fromlen);
1226 * @param cls the plugin handle
1227 * @param tc the scheduling context (for rescheduling this function again)
1229 * We have been notified that our writeset has something to read. We don't
1230 * know which socket needs to be read, so we have to check each one
1231 * Then reschedule this function to be called again once more is available.
1235 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1237 struct Plugin *plugin = cls;
1239 struct UDPMessage *msg;
1240 struct GNUNET_PeerIdentity *sender;
1241 unsigned int buflen;
1243 struct sockaddr_storage addr;
1249 const struct GNUNET_MessageHeader *currhdr;
1251 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1253 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1259 buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock.desc);
1261 if (buflen == GNUNET_NO)
1264 buf = GNUNET_malloc (buflen);
1265 fromlen = sizeof (addr);
1266 memset (&addr, 0, fromlen);
1268 GNUNET_NETWORK_socket_recvfrom (udp_sock.desc, buf, buflen,
1269 (struct sockaddr *) &addr, &fromlen);
1272 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1273 ("socket_recv returned %u, src_addr_len is %u\n"), ret,
1282 msg = (struct UDPMessage *) buf;
1285 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1286 ("header reports message size of %d, type %d\n"),
1287 ntohs (msg->header.size), ntohs (msg->header.type));
1289 if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
1295 msgbuf = (char *)&msg[1];
1296 sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1297 memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1301 tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
1303 while (offset < tsize)
1305 currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
1307 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1308 ("processing msg %d: type %d, size %d at offset %d\n"),
1309 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1311 udp_demultiplexer(plugin, sender, currhdr, &addr, fromlen, &udp_sock);
1313 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1314 ("processing done msg %d: type %d, size %d at offset %d\n"),
1315 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1317 offset += ntohs(currhdr->size);
1320 GNUNET_free_non_null (buf);
1321 GNUNET_free_non_null (sender);
1324 plugin->select_task =
1325 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1326 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1327 GNUNET_SCHEDULER_NO_TASK,
1328 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1329 NULL, &udp_plugin_select, plugin);
1334 * Create a slew of UDP sockets. If possible, use IPv6, otherwise
1337 * @param cls closure for server start, should be a struct Plugin *
1339 * @return number of sockets created or GNUNET_SYSERR on error
1342 udp_transport_server_start (void *cls)
1344 struct Plugin *plugin = cls;
1345 struct sockaddr_in serverAddrv4;
1346 struct sockaddr_in6 serverAddrv6;
1347 struct sockaddr *serverAddr;
1349 int sockets_created;
1351 sockets_created = 0;
1353 if (plugin->behind_nat == GNUNET_YES)
1355 /* Pipe to read from started processes stdout (on read end) */
1356 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
1357 if (plugin->server_stdout == NULL)
1358 return sockets_created;
1360 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1362 "Starting gnunet-nat-server process cmd: %s %s\n", "gnunet-nat-server", plugin->internal_address);
1364 /* Start the server process */
1365 plugin->server_pid = GNUNET_OS_start_process(NULL, plugin->server_stdout, "gnunet-nat-server", "gnunet-nat-server", plugin->internal_address, NULL);
1366 if (plugin->server_pid == GNUNET_SYSERR)
1369 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1371 "Failed to start gnunet-nat-server process\n");
1373 return GNUNET_SYSERR;
1375 /* Close the write end of the read pipe */
1376 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
1378 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
1379 plugin->server_read_task =
1380 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1381 GNUNET_TIME_UNIT_FOREVER_REL,
1382 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1385 udp_sock.desc = NULL;
1388 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
1389 if (NULL == udp_sock.desc)
1391 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
1392 return sockets_created;
1396 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1397 #if HAVE_SOCKADDR_IN_SIN_LEN
1398 serverAddrv4.sin_len = sizeof (serverAddrv4);
1400 serverAddrv4.sin_family = AF_INET;
1401 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1402 serverAddrv4.sin_port = htons (plugin->port);
1403 addrlen = sizeof (serverAddrv4);
1404 serverAddr = (struct sockaddr *) &serverAddrv4;
1406 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1408 "Binding to port %d\n", ntohs(serverAddrv4.sin_port));
1410 while (GNUNET_NETWORK_socket_bind (udp_sock.desc, serverAddr, addrlen) !=
1413 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1415 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1417 "Binding failed, trying new port %d\n", ntohs(serverAddrv4.sin_port));
1420 udp_sock.port = ntohs(serverAddrv4.sin_port);
1425 if ((udp_sock.desc == NULL) && (GNUNET_YES !=
1426 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
1429 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
1430 if (udp_sock.desc != NULL)
1432 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1433 #if HAVE_SOCKADDR_IN_SIN_LEN
1434 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1436 serverAddrv6.sin6_family = AF_INET6;
1437 serverAddrv6.sin6_addr = in6addr_any;
1438 serverAddrv6.sin6_port = htons (plugin->port);
1439 addrlen = sizeof (serverAddrv6);
1440 serverAddr = (struct sockaddr *) &serverAddrv6;
1445 plugin->rs = GNUNET_NETWORK_fdset_create ();
1447 GNUNET_NETWORK_fdset_zero (plugin->rs);
1450 GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock.desc);
1452 plugin->select_task =
1453 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1454 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1455 GNUNET_SCHEDULER_NO_TASK,
1456 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1457 NULL, &udp_plugin_select, plugin);
1459 return sockets_created;
1464 * Another peer has suggested an address for this peer and transport
1465 * plugin. Check that this could be a valid address. This function
1466 * is not expected to 'validate' the address in the sense of trying to
1467 * connect to it but simply to see if the binary format is technically
1468 * legal for establishing a connection.
1470 * @param cls closure, should be our handle to the Plugin
1471 * @param addr pointer to the address, may be modified (slightly)
1472 * @param addrlen length of addr
1473 * @return GNUNET_OK if this is a plausible address for this peer
1474 * and transport, GNUNET_SYSERR if not
1478 udp_check_address (void *cls, void *addr, size_t addrlen)
1480 struct Plugin *plugin = cls;
1481 char buf[sizeof (struct sockaddr_in6)];
1483 struct sockaddr_in *v4;
1484 struct sockaddr_in6 *v6;
1486 if ((addrlen != sizeof (struct sockaddr_in)) &&
1487 (addrlen != sizeof (struct sockaddr_in6)))
1489 GNUNET_break_op (0);
1490 return GNUNET_SYSERR;
1492 memcpy (buf, addr, sizeof (struct sockaddr_in6));
1493 if (addrlen == sizeof (struct sockaddr_in))
1495 v4 = (struct sockaddr_in *) buf;
1496 v4->sin_port = htons (plugin->port);
1500 v6 = (struct sockaddr_in6 *) buf;
1501 v6->sin6_port = htons (plugin->port);
1505 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1507 "Informing transport service about my address `%s'.\n",
1508 GNUNET_a2s (addr, addrlen));
1515 * Append our port and forward the result.
1518 append_port (void *cls, const char *hostname)
1520 struct PrettyPrinterContext *ppc = cls;
1523 if (hostname == NULL)
1525 ppc->asc (ppc->asc_cls, NULL);
1529 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1530 ppc->asc (ppc->asc_cls, ret);
1536 * Convert the transports address to a nice, human-readable
1539 * @param cls closure
1540 * @param type name of the transport that generated the address
1541 * @param addr one of the addresses of the host, NULL for the last address
1542 * the specific address format depends on the transport
1543 * @param addrlen length of the address
1544 * @param numeric should (IP) addresses be displayed in numeric form?
1545 * @param timeout after how long should we give up?
1546 * @param asc function to call on each string
1547 * @param asc_cls closure for asc
1550 udp_plugin_address_pretty_printer (void *cls,
1555 struct GNUNET_TIME_Relative timeout,
1556 GNUNET_TRANSPORT_AddressStringCallback asc,
1559 struct Plugin *plugin = cls;
1560 const struct sockaddr_in *v4;
1561 const struct sockaddr_in6 *v6;
1562 struct PrettyPrinterContext *ppc;
1564 if ((addrlen != sizeof (struct sockaddr_in)) &&
1565 (addrlen != sizeof (struct sockaddr_in6)))
1567 /* invalid address */
1568 GNUNET_break_op (0);
1569 asc (asc_cls, NULL);
1572 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1574 ppc->asc_cls = asc_cls;
1575 if (addrlen == sizeof (struct sockaddr_in))
1577 v4 = (const struct sockaddr_in *) addr;
1578 ppc->port = ntohs (v4->sin_port);
1582 v6 = (const struct sockaddr_in6 *) addr;
1583 ppc->port = ntohs (v6->sin6_port);
1586 GNUNET_RESOLVER_hostname_get (plugin->env->sched,
1590 !numeric, timeout, &append_port, ppc);
1594 * Return the actual path to a file found in the current
1595 * PATH environment variable.
1597 * @param binary the name of the file to find
1600 get_path_from_PATH (char *binary)
1608 p = getenv ("PATH");
1611 path = GNUNET_strdup (p); /* because we write on it */
1612 buf = GNUNET_malloc (strlen (path) + 20);
1615 while (NULL != (end = strchr (pos, ':')))
1618 sprintf (buf, "%s/%s", pos, binary);
1619 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1626 sprintf (buf, "%s/%s", pos, binary);
1627 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1638 * Check whether the suid bit is set on a file.
1639 * Attempts to find the file using the current
1640 * PATH environment variable as a search path.
1642 * @param binary the name of the file to check
1645 check_gnunet_nat_binary(char *binary)
1647 struct stat statbuf;
1650 p = get_path_from_PATH (binary);
1653 if (0 != STAT (p, &statbuf))
1656 return GNUNET_SYSERR;
1659 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
1660 (statbuf.st_uid == 0) )
1666 * The exported method. Makes the core api available via a global and
1667 * returns the udp transport API.
1670 libgnunet_plugin_transport_udp_init (void *cls)
1672 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1673 unsigned long long mtu;
1674 unsigned long long port;
1675 struct GNUNET_TRANSPORT_PluginFunctions *api;
1676 struct Plugin *plugin;
1677 struct GNUNET_SERVICE_Context *service;
1678 int sockets_created;
1681 int only_nat_addresses;
1682 char *internal_address;
1683 char *external_address;
1684 struct sockaddr_in in_addr;
1686 service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
1687 if (service == NULL)
1689 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", _
1690 ("Failed to start service for `%s' transport plugin.\n"),
1695 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1699 /* We are behind nat (according to the user) */
1700 if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
1701 behind_nat = GNUNET_YES;
1704 behind_nat = GNUNET_NO;
1705 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");
1709 behind_nat = GNUNET_NO; /* We are not behind nat! */
1711 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1715 if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
1716 allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
1719 allow_nat = GNUNET_NO;
1720 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");
1725 allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
1727 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1729 "ONLY_NAT_ADDRESSES"))
1730 only_nat_addresses = GNUNET_YES; /* We will only report our addresses as NAT'd */
1732 only_nat_addresses = GNUNET_NO; /* We will report our addresses as NAT'd and non-NAT'd */
1734 external_address = NULL;
1735 if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
1736 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1739 &external_address)))
1741 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1744 ("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
1746 GNUNET_SERVICE_stop (service);
1750 if ((external_address != NULL) && (inet_pton(AF_INET, external_address, &in_addr.sin_addr) != 1))
1752 GNUNET_log_from(GNUNET_ERROR_TYPE_WARNING, "udp", "Malformed EXTERNAL_ADDRESS %s given in configuration!\n", external_address);
1755 internal_address = NULL;
1756 if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
1757 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1760 &internal_address)))
1762 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1765 ("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
1767 GNUNET_SERVICE_stop (service);
1768 GNUNET_free_non_null(external_address);
1772 if ((internal_address != NULL) && (inet_pton(AF_INET, internal_address, &in_addr.sin_addr) != 1))
1774 GNUNET_log_from(GNUNET_ERROR_TYPE_WARNING, "udp", "Malformed INTERNAL_ADDRESS %s given in configuration!\n", internal_address);
1778 GNUNET_CONFIGURATION_get_value_number (env->cfg,
1782 port = UDP_NAT_DEFAULT_PORT;
1783 else if (port > 65535)
1785 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
1787 _("Given `%s' option is out of range: %llu > %u\n"),
1791 GNUNET_SERVICE_stop (service);
1792 GNUNET_free_non_null(external_address);
1793 GNUNET_free_non_null(internal_address);
1799 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
1801 _("MTU %llu for `%s' is probably too low!\n"), mtu,
1804 plugin = GNUNET_malloc (sizeof (struct Plugin));
1805 plugin->external_address = external_address;
1806 plugin->internal_address = internal_address;
1807 plugin->port = port;
1808 plugin->behind_nat = behind_nat;
1809 plugin->allow_nat = allow_nat;
1810 plugin->only_nat_addresses = only_nat_addresses;
1813 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1816 api->send = &udp_plugin_send;
1817 api->disconnect = &udp_disconnect;
1818 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1819 api->check_address = &udp_check_address;
1821 plugin->service = service;
1823 if (plugin->behind_nat == GNUNET_NO)
1825 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
1828 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
1831 HOSTNAME_RESOLVE_TIMEOUT,
1832 &process_hostname_ips,
1835 if ((plugin->behind_nat == GNUNET_YES) && (inet_pton(AF_INET, plugin->external_address, &in_addr.sin_addr) == 1))
1837 in_addr.sin_port = htons(0);
1838 in_addr.sin_family = AF_INET;
1839 plugin->env->notify_address (plugin->env->cls,
1841 &in_addr, sizeof(in_addr), GNUNET_TIME_UNIT_FOREVER_REL);
1843 else if ((plugin->external_address != NULL) && (inet_pton(AF_INET, plugin->external_address, &in_addr.sin_addr) == 1))
1845 in_addr.sin_port = htons(plugin->port);
1846 in_addr.sin_family = AF_INET;
1847 plugin->env->notify_address (plugin->env->cls,
1849 &in_addr, sizeof(in_addr), GNUNET_TIME_UNIT_FOREVER_REL);
1852 sockets_created = udp_transport_server_start (plugin);
1854 GNUNET_assert (sockets_created == 1);
1860 libgnunet_plugin_transport_udp_done (void *cls)
1862 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1863 struct Plugin *plugin = api->cls;
1865 udp_transport_server_stop (plugin);
1866 if (NULL != hostname_dns)
1868 GNUNET_RESOLVER_request_cancel (hostname_dns);
1869 hostname_dns = NULL;
1872 GNUNET_SERVICE_stop (plugin->service);
1874 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1875 GNUNET_free (plugin);
1880 /* end of plugin_transport_udp.c */