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"));
525 cont (cont_cls, target, GNUNET_SYSERR);
526 return 0; /* Can never send if we don't have an address!! */
529 /* Build the message to be sent */
530 message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
531 ssize = sizeof (struct UDPMessage) + msgbuf_size;
533 message->header.size = htons (ssize);
534 message->header.type = htons (0);
535 memcpy (&message->sender, plugin->env->my_identity,
536 sizeof (struct GNUNET_PeerIdentity));
537 memcpy (&message[1], msgbuf, msgbuf_size);
539 /* Actually send the message */
541 GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
547 if (sent == GNUNET_SYSERR)
548 cont (cont_cls, target, GNUNET_SYSERR);
551 cont (cont_cls, target, GNUNET_OK);
555 GNUNET_free (message);
560 * We learned about a peer (possibly behind NAT) so run the
561 * gnunet-nat-client to send dummy ICMP responses
563 * @param plugin the plugin for this transport
564 * @param addr the address of the peer
565 * @param addrlen the length of the address
568 run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
570 char inet4[INET_ADDRSTRLEN];
571 char *address_as_string;
572 char *port_as_string;
574 const struct sockaddr *sa = (const struct sockaddr *)addr;
576 if (addrlen < sizeof (struct sockaddr))
578 switch (sa->sa_family)
581 if (addrlen != sizeof (struct sockaddr_in))
584 &((struct sockaddr_in *) sa)->sin_addr,
585 inet4, INET_ADDRSTRLEN);
586 address_as_string = GNUNET_strdup (inet4);
593 GNUNET_asprintf(&port_as_string, "%d", plugin->port);
595 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
596 _("Running gnunet-nat-client with arguments: %s %s %d\n"), plugin->external_address, address_as_string, plugin->port);
599 /* Start the server process */
600 pid = GNUNET_OS_start_process(NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, port_as_string, NULL);
601 GNUNET_free(address_as_string);
602 GNUNET_free(port_as_string);
603 GNUNET_OS_process_wait (pid);
607 * Function that can be used by the transport service to transmit
608 * a message using the plugin.
611 * @param target who should receive this message (ignored by UDP)
612 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
613 * @param msgbuf_size the size of the msgbuf to send
614 * @param priority how important is the message (ignored by UDP)
615 * @param timeout when should we time out (give up) if we can not transmit?
616 * @param session identifier used for this session (can be NULL)
617 * @param addr the addr to send the message to, needs to be a sockaddr for us
618 * @param addrlen the len of addr
619 * @param force_address not used, we had better have an address to send to
620 * because we are stateless!!
621 * @param cont continuation to call once the message has
622 * been transmitted (or if the transport is ready
623 * for the next transmission call; or if the
624 * peer disconnected...)
625 * @param cont_cls closure for cont
627 * @return the number of bytes written (may return 0 and the message can
628 * still be transmitted later!)
631 udp_plugin_send (void *cls,
632 const struct GNUNET_PeerIdentity *target,
635 unsigned int priority,
636 struct GNUNET_TIME_Relative timeout,
637 struct Session *session,
641 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
643 struct Plugin *plugin = cls;
645 struct MessageQueue *temp_message;
646 struct PeerSession *peer_session;
647 struct sockaddr_in *sockaddr = (struct sockaddr_in *)addr;
650 GNUNET_assert (NULL == session);
651 other_peer_natd = GNUNET_NO;
652 if ((sockaddr->sin_family == AF_INET) && (ntohs(sockaddr->sin_port) == 0))
654 other_peer_natd = GNUNET_YES;
659 if ((other_peer_natd == GNUNET_YES) && (plugin->allow_nat == GNUNET_YES))
661 peer_session = find_session(plugin, target);
662 if (peer_session == NULL) /* We have a new peer to add */
665 * The first time, we can assume we have no knowledge of a
666 * working port for this peer, call the ICMP/UDP message sender
669 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
670 peer_session->connect_addr = GNUNET_malloc(addrlen);
671 memcpy(peer_session->connect_addr, addr, addrlen);
672 peer_session->connect_alen = addrlen;
673 peer_session->plugin = plugin;
674 peer_session->sock = NULL;
675 memcpy(&peer_session->target, target, sizeof(struct GNUNET_PeerIdentity));
676 peer_session->expecting_welcome = GNUNET_YES;
678 peer_session->next = plugin->sessions;
679 plugin->sessions = peer_session;
681 peer_session->messages = GNUNET_malloc(sizeof(struct MessageQueue));
682 peer_session->messages->msgbuf = GNUNET_malloc(msgbuf_size);
683 memcpy(peer_session->messages->msgbuf, msgbuf, msgbuf_size);
684 peer_session->messages->msgbuf_size = msgbuf_size;
685 peer_session->messages->next = NULL;
686 peer_session->messages->timeout = GNUNET_TIME_relative_to_absolute(timeout);
687 peer_session->messages->cont = cont;
688 peer_session->messages->cont_cls = cont_cls;
690 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
691 _("Other peer is NAT'd, set up peer session for peer %s\n"), GNUNET_i2s(target));
693 run_gnunet_nat_client(plugin, addr, addrlen);
697 if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */
699 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);
701 else /* Haven't gotten a response from this peer, queue message */
703 temp_message = GNUNET_malloc(sizeof(struct MessageQueue));
704 temp_message->msgbuf = GNUNET_malloc(msgbuf_size);
705 memcpy(temp_message->msgbuf, msgbuf, msgbuf_size);
706 temp_message->msgbuf_size = msgbuf_size;
707 temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout);
708 temp_message->cont = cont;
709 temp_message->cont_cls = cont_cls;
710 temp_message->next = peer_session->messages;
711 peer_session->messages = temp_message;
715 else if (other_peer_natd == GNUNET_NO) /* Other peer not behind a NAT, so we can just send the message as is */
717 sent = udp_real_send(cls, udp_sock.desc, target, msgbuf, msgbuf_size, priority, timeout, addr, addrlen, cont, cont_cls);
719 else /* Other peer is NAT'd, but we don't want to play with them (or can't!) */
720 return GNUNET_SYSERR;
722 /* When GNUNET_SYSERR is returned from udp_real_send, we will still call
723 * the callback so must not return GNUNET_SYSERR!
724 * If we do, then transport context get freed twice. */
725 if (sent == GNUNET_SYSERR)
733 * Add the IP of our network interface to the list of
734 * our external IP addresses.
737 process_interfaces (void *cls,
740 const struct sockaddr *addr, socklen_t addrlen)
742 struct Plugin *plugin = cls;
744 struct sockaddr_in *v4;
745 struct sockaddr_in6 *v6;
746 struct sockaddr *addr_nat;
749 af = addr->sa_family;
752 v4 = (struct sockaddr_in *) addr;
753 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
755 v4->sin_port = htons (0); /* Indicates to receiver we are behind NAT */
757 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
759 addr_nat = GNUNET_malloc(addrlen);
760 memcpy(addr_nat, addr, addrlen);
761 v4 = (struct sockaddr_in *) addr_nat;
762 v4->sin_port = htons(plugin->port);
766 v4->sin_port = htons (plugin->port);
771 GNUNET_assert (af == AF_INET6);
772 v6 = (struct sockaddr_in6 *) addr;
773 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
775 v6->sin6_port = htons (0);
777 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
779 addr_nat = GNUNET_malloc(addrlen);
780 memcpy(addr_nat, addr, addrlen);
781 v6 = (struct sockaddr_in6 *) addr_nat;
782 v6->sin6_port = htons(plugin->port);
786 v6->sin6_port = htons (plugin->port);
790 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
791 GNUNET_ERROR_TYPE_BULK,
792 "udp", _("Found address `%s' (%s)\n"),
793 GNUNET_a2s (addr, addrlen), name);
795 if (addr_nat != NULL)
797 plugin->env->notify_address (plugin->env->cls,
799 addr_nat, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
800 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
801 GNUNET_ERROR_TYPE_BULK,
802 "udp", _("Found NAT address `%s' (%s)\n"),
803 GNUNET_a2s (addr_nat, addrlen), name);
804 GNUNET_free(addr_nat);
807 plugin->env->notify_address (plugin->env->cls,
809 addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
816 * Function called by the resolver for each address obtained from DNS
817 * for our own hostname. Add the addresses to the list of our
818 * external IP addresses.
821 * @param addr one of the addresses of the host, NULL for the last address
822 * @param addrlen length of the address
825 process_hostname_ips (void *cls,
826 const struct sockaddr *addr, socklen_t addrlen)
828 struct Plugin *plugin = cls;
832 plugin->hostname_dns = NULL;
835 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
840 * Send UDP probe messages or UDP keepalive messages, depending on the
841 * state of the connection.
843 * @param cls closure for this call (should be the main Plugin)
844 * @param tc task context for running this
847 send_udp_probe_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
849 struct UDP_NAT_Probes *probe = cls;
850 struct UDP_NAT_ProbeMessage *message;
851 struct Plugin *plugin = probe->plugin;
853 message = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessage));
854 message->header.size = htons(sizeof(struct UDP_NAT_ProbeMessage));
855 message->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE);
856 /* If they gave us a port, use that. If not, try our port. */
857 if (probe->port != 0)
858 probe->sock_addr.sin_port = htons(probe->port);
860 probe->sock_addr.sin_port = htons(plugin->port);
863 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
864 _("Sending a probe to port %d\n"), ntohs(probe->sock_addr.sin_port));
869 udp_real_send(plugin, udp_sock.desc, NULL,
870 (char *)message, ntohs(message->header.size), 0,
871 GNUNET_TIME_relative_get_unit(),
872 &probe->sock_addr, sizeof(probe->sock_addr),
873 &udp_probe_continuation, probe);
875 GNUNET_free(message);
880 * Continuation for probe sends. If the last probe was sent
881 * "successfully", schedule sending of another one. If not,
885 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result)
887 struct UDP_NAT_Probes *probe = cls;
888 struct Plugin *plugin = probe->plugin;
890 if ((result == GNUNET_OK) && (probe->count < MAX_PROBES))
893 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
894 _("Scheduling next probe for 10000 milliseconds\n"));
896 probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 10000), &send_udp_probe_message, probe);
898 else /* Destroy the probe context. */
901 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
902 _("Sending probe didn't go well...\n"));
908 * Find probe message by address
910 * @param plugin the plugin for this transport
911 * @param address_string the ip address as a string
913 struct UDP_NAT_Probes *
914 find_probe(struct Plugin *plugin, char * address_string)
916 struct UDP_NAT_Probes *pos;
918 pos = plugin->probes;
920 if (strcmp(pos->address_string, address_string) == 0)
928 * @param cls the plugin handle
929 * @param tc the scheduling context (for rescheduling this function again)
931 * We have been notified that gnunet-nat-server has written something to stdout.
932 * Handle the output, then reschedule this function to be called again once
937 udp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
939 struct Plugin *plugin = cls;
942 memset(&mybuf, 0, sizeof(mybuf));
944 struct UDP_NAT_Probes *temp_probe;
947 struct sockaddr_in in_addr;
949 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
952 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
957 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
958 _("Finished reading from server stdout with code: %d\n"), bytes);
965 for (i = 0; i < sizeof(mybuf); i++)
967 if (mybuf[i] == '\n')
970 if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
973 port_start = &mybuf[i + 1];
977 if (port_start != NULL)
978 port = atoi(port_start);
981 plugin->server_read_task =
982 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
983 GNUNET_TIME_UNIT_FOREVER_REL,
984 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
989 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
990 _("nat-server-read read: %s port %d\n"), &mybuf, port);
994 * We have received an ICMP response, ostensibly from a non-NAT'd peer
995 * that wants to connect to us! Send a message to establish a connection.
997 if (inet_pton(AF_INET, &mybuf[0], &in_addr.sin_addr) != 1)
1000 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp",
1001 _("nat-server-read malformed address\n"), &mybuf, port);
1003 plugin->server_read_task =
1004 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1005 GNUNET_TIME_UNIT_FOREVER_REL,
1006 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1010 temp_probe = find_probe(plugin, &mybuf[0]);
1012 if (temp_probe == NULL)
1014 temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes));
1015 temp_probe->address_string = strdup(&mybuf[0]);
1016 temp_probe->sock_addr.sin_family = AF_INET;
1017 GNUNET_assert(inet_pton(AF_INET, &mybuf[0], &temp_probe->sock_addr.sin_addr) == 1);
1018 temp_probe->port = port;
1019 temp_probe->next = plugin->probes;
1020 temp_probe->plugin = plugin;
1021 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);
1022 plugin->probes = temp_probe;
1025 plugin->server_read_task =
1026 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1027 GNUNET_TIME_UNIT_FOREVER_REL,
1028 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1034 * Demultiplexer for UDP NAT messages
1036 * @param plugin the main plugin for this transport
1037 * @param sender from which peer the message was received
1038 * @param currhdr pointer to the header of the message
1039 * @param sender_addr the address from which the message was received
1040 * @param fromlen the length of the address
1041 * @param sockinfo which socket did we receive the message on
1044 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)
1046 struct UDP_NAT_ProbeMessageReply *outgoing_probe_reply;
1047 struct UDP_NAT_ProbeMessageConfirmation *outgoing_probe_confirmation;
1049 char addr_buf[INET_ADDRSTRLEN];
1050 struct UDP_NAT_Probes *outgoing_probe;
1051 struct PeerSession *peer_session;
1052 struct MessageQueue *pending_message;
1053 struct MessageQueue *pending_message_temp;
1055 if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
1058 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1059 _("Received a message from myself, dropping!!!\n"));
1064 switch (ntohs(currhdr->type))
1066 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE:
1067 /* Send probe reply */
1068 outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply));
1069 outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply));
1070 outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY);
1073 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1074 _("Received a probe on listen port %d, sent_from port %d\n"), sockinfo->port, ntohs(((struct sockaddr_in *)sender_addr)->sin_port));
1077 udp_real_send(plugin, sockinfo->desc, NULL,
1078 (char *)outgoing_probe_reply,
1079 ntohs(outgoing_probe_reply->header.size), 0,
1080 GNUNET_TIME_relative_get_unit(),
1081 sender_addr, fromlen,
1085 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1086 _("Sent PROBE REPLY to port %d on outgoing port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1088 GNUNET_free(outgoing_probe_reply);
1090 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY:
1091 /* Check for existing probe, check ports returned, send confirmation if all is well */
1093 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1094 _("Received PROBE REPLY from port %d on incoming port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1096 if (sender_addr->ss_family == AF_INET)
1098 memset(&addr_buf, 0, sizeof(addr_buf));
1099 inet_ntop(AF_INET, &((struct sockaddr_in *) sender_addr)->sin_addr, addr_buf, INET_ADDRSTRLEN);
1100 outgoing_probe = find_probe(plugin, &addr_buf[0]);
1101 if (outgoing_probe != NULL)
1104 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1105 _("Sending confirmation that we were reached!\n"));
1107 outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1108 outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1109 outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM);
1111 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);
1113 if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK)
1115 GNUNET_SCHEDULER_cancel(plugin->env->sched, outgoing_probe->task);
1116 outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK;
1117 /* Schedule task to timeout and remove probe if confirmation not received */
1119 GNUNET_free(outgoing_probe_confirmation);
1124 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1125 _("Received a probe reply, but have no record of a sent probe!\n"));
1130 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM:
1131 peer_session = find_session(plugin, sender);
1133 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1134 _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
1136 if (peer_session == NULL) /* Shouldn't this NOT happen? */
1139 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1140 _("Peer not in list, adding (THIS MAY BE A MISTAKE) %s\n"), GNUNET_i2s(sender));
1142 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
1143 peer_session->connect_addr = GNUNET_malloc(fromlen);
1144 memcpy(peer_session->connect_addr, sender_addr, fromlen);
1145 peer_session->connect_alen = fromlen;
1146 peer_session->plugin = plugin;
1147 peer_session->sock = sockinfo->desc;
1148 memcpy(&peer_session->target, sender, sizeof(struct GNUNET_PeerIdentity));
1149 peer_session->expecting_welcome = GNUNET_NO;
1151 peer_session->next = plugin->sessions;
1152 plugin->sessions = peer_session;
1154 peer_session->messages = NULL;
1156 else if (peer_session->expecting_welcome == GNUNET_YES)
1158 peer_session->expecting_welcome = GNUNET_NO;
1159 peer_session->sock = sockinfo->desc;
1160 ((struct sockaddr_in *)peer_session->connect_addr)->sin_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1162 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1163 _("Received a probe confirmation, will send to peer on port %d\n"), ntohs(((struct sockaddr_in *)peer_session->connect_addr)->sin_port));
1165 if (peer_session->messages != NULL)
1168 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1169 _("Received a probe confirmation, sending queued messages.\n"));
1171 pending_message = peer_session->messages;
1173 while (pending_message != NULL)
1176 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1177 _("sending queued message %d\n"), count);
1179 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);
1180 pending_message_temp = pending_message;
1181 pending_message = pending_message->next;
1182 GNUNET_free(pending_message_temp->msgbuf);
1183 GNUNET_free(pending_message_temp);
1185 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1186 _("finished sending queued message %d\n"), count);
1196 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1197 _("Received probe confirmation for already confirmed peer!\n"));
1200 /* Received confirmation, add peer with address/port specified */
1202 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE:
1203 /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */
1204 /* If we receive these just ignore! */
1207 plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE,
1208 NULL, (char *)sender_addr, fromlen);
1215 * @param cls the plugin handle
1216 * @param tc the scheduling context (for rescheduling this function again)
1218 * We have been notified that our writeset has something to read. We don't
1219 * know which socket needs to be read, so we have to check each one
1220 * Then reschedule this function to be called again once more is available.
1224 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1226 struct Plugin *plugin = cls;
1228 struct UDPMessage *msg;
1229 struct GNUNET_PeerIdentity *sender;
1230 unsigned int buflen;
1232 struct sockaddr_storage addr;
1238 const struct GNUNET_MessageHeader *currhdr;
1240 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1242 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1248 buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock.desc);
1250 if (buflen == GNUNET_NO)
1253 buf = GNUNET_malloc (buflen);
1254 fromlen = sizeof (addr);
1255 memset (&addr, 0, fromlen);
1257 GNUNET_NETWORK_socket_recvfrom (udp_sock.desc, buf, buflen,
1258 (struct sockaddr *) &addr, &fromlen);
1261 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1262 ("socket_recv returned %u, src_addr_len is %u\n"), ret,
1271 msg = (struct UDPMessage *) buf;
1274 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1275 ("header reports message size of %d, type %d\n"),
1276 ntohs (msg->header.size), ntohs (msg->header.type));
1278 if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
1284 msgbuf = (char *)&msg[1];
1285 sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1286 memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1290 tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
1292 while (offset < tsize)
1294 currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
1296 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1297 ("processing msg %d: type %d, size %d at offset %d\n"),
1298 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1300 udp_demultiplexer(plugin, sender, currhdr, &addr, fromlen, &udp_sock);
1302 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1303 ("processing done msg %d: type %d, size %d at offset %d\n"),
1304 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1306 offset += ntohs(currhdr->size);
1309 GNUNET_free_non_null (buf);
1310 GNUNET_free_non_null (sender);
1313 plugin->select_task =
1314 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1315 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1316 GNUNET_SCHEDULER_NO_TASK,
1317 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1318 NULL, &udp_plugin_select, plugin);
1323 * Create a slew of UDP sockets. If possible, use IPv6, otherwise
1326 * @param cls closure for server start, should be a struct Plugin *
1328 * @return number of sockets created or GNUNET_SYSERR on error
1331 udp_transport_server_start (void *cls)
1333 struct Plugin *plugin = cls;
1334 struct sockaddr_in serverAddrv4;
1335 struct sockaddr_in6 serverAddrv6;
1336 struct sockaddr *serverAddr;
1338 int sockets_created;
1340 sockets_created = 0;
1342 if (plugin->behind_nat == GNUNET_YES)
1344 /* Pipe to read from started processes stdout (on read end) */
1345 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
1346 if (plugin->server_stdout == NULL)
1347 return sockets_created;
1349 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1351 "Starting gnunet-nat-server process cmd: %s %s\n", "gnunet-nat-server", plugin->internal_address);
1353 /* Start the server process */
1354 plugin->server_pid = GNUNET_OS_start_process(NULL, plugin->server_stdout, "gnunet-nat-server", "gnunet-nat-server", plugin->internal_address, NULL);
1355 if (plugin->server_pid == GNUNET_SYSERR)
1358 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1360 "Failed to start gnunet-nat-server process\n");
1362 return GNUNET_SYSERR;
1364 /* Close the write end of the read pipe */
1365 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
1367 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
1368 plugin->server_read_task =
1369 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1370 GNUNET_TIME_UNIT_FOREVER_REL,
1371 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1374 udp_sock.desc = NULL;
1377 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
1378 if (NULL == udp_sock.desc)
1380 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
1381 return sockets_created;
1385 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1386 #if HAVE_SOCKADDR_IN_SIN_LEN
1387 serverAddrv4.sin_len = sizeof (serverAddrv4);
1389 serverAddrv4.sin_family = AF_INET;
1390 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1391 serverAddrv4.sin_port = htons (plugin->port);
1392 addrlen = sizeof (serverAddrv4);
1393 serverAddr = (struct sockaddr *) &serverAddrv4;
1395 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1397 "Binding to port %d\n", ntohs(serverAddrv4.sin_port));
1399 while (GNUNET_NETWORK_socket_bind (udp_sock.desc, serverAddr, addrlen) !=
1402 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1404 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1406 "Binding failed, trying new port %d\n", ntohs(serverAddrv4.sin_port));
1409 udp_sock.port = ntohs(serverAddrv4.sin_port);
1414 if ((udp_sock.desc == NULL) && (GNUNET_YES !=
1415 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
1418 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
1419 if (udp_sock.desc != NULL)
1421 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1422 #if HAVE_SOCKADDR_IN_SIN_LEN
1423 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1425 serverAddrv6.sin6_family = AF_INET6;
1426 serverAddrv6.sin6_addr = in6addr_any;
1427 serverAddrv6.sin6_port = htons (plugin->port);
1428 addrlen = sizeof (serverAddrv6);
1429 serverAddr = (struct sockaddr *) &serverAddrv6;
1434 plugin->rs = GNUNET_NETWORK_fdset_create ();
1436 GNUNET_NETWORK_fdset_zero (plugin->rs);
1439 GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock.desc);
1441 plugin->select_task =
1442 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1443 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1444 GNUNET_SCHEDULER_NO_TASK,
1445 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1446 NULL, &udp_plugin_select, plugin);
1448 return sockets_created;
1453 * Another peer has suggested an address for this peer and transport
1454 * plugin. Check that this could be a valid address. This function
1455 * is not expected to 'validate' the address in the sense of trying to
1456 * connect to it but simply to see if the binary format is technically
1457 * legal for establishing a connection.
1459 * @param cls closure, should be our handle to the Plugin
1460 * @param addr pointer to the address, may be modified (slightly)
1461 * @param addrlen length of addr
1462 * @return GNUNET_OK if this is a plausible address for this peer
1463 * and transport, GNUNET_SYSERR if not
1467 udp_check_address (void *cls, void *addr, size_t addrlen)
1469 struct Plugin *plugin = cls;
1470 char buf[sizeof (struct sockaddr_in6)];
1472 struct sockaddr_in *v4;
1473 struct sockaddr_in6 *v6;
1475 if ((addrlen != sizeof (struct sockaddr_in)) &&
1476 (addrlen != sizeof (struct sockaddr_in6)))
1478 GNUNET_break_op (0);
1479 return GNUNET_SYSERR;
1481 memcpy (buf, addr, sizeof (struct sockaddr_in6));
1482 if (addrlen == sizeof (struct sockaddr_in))
1484 v4 = (struct sockaddr_in *) buf;
1485 v4->sin_port = htons (plugin->port);
1489 v6 = (struct sockaddr_in6 *) buf;
1490 v6->sin6_port = htons (plugin->port);
1494 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1496 "Informing transport service about my address `%s'.\n",
1497 GNUNET_a2s (addr, addrlen));
1504 * Append our port and forward the result.
1507 append_port (void *cls, const char *hostname)
1509 struct PrettyPrinterContext *ppc = cls;
1512 if (hostname == NULL)
1514 ppc->asc (ppc->asc_cls, NULL);
1518 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1519 ppc->asc (ppc->asc_cls, ret);
1525 * Convert the transports address to a nice, human-readable
1528 * @param cls closure
1529 * @param type name of the transport that generated the address
1530 * @param addr one of the addresses of the host, NULL for the last address
1531 * the specific address format depends on the transport
1532 * @param addrlen length of the address
1533 * @param numeric should (IP) addresses be displayed in numeric form?
1534 * @param timeout after how long should we give up?
1535 * @param asc function to call on each string
1536 * @param asc_cls closure for asc
1539 udp_plugin_address_pretty_printer (void *cls,
1544 struct GNUNET_TIME_Relative timeout,
1545 GNUNET_TRANSPORT_AddressStringCallback asc,
1548 struct Plugin *plugin = cls;
1549 const struct sockaddr_in *v4;
1550 const struct sockaddr_in6 *v6;
1551 struct PrettyPrinterContext *ppc;
1553 if ((addrlen != sizeof (struct sockaddr_in)) &&
1554 (addrlen != sizeof (struct sockaddr_in6)))
1556 /* invalid address */
1557 GNUNET_break_op (0);
1558 asc (asc_cls, NULL);
1561 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1563 ppc->asc_cls = asc_cls;
1564 if (addrlen == sizeof (struct sockaddr_in))
1566 v4 = (const struct sockaddr_in *) addr;
1567 ppc->port = ntohs (v4->sin_port);
1571 v6 = (const struct sockaddr_in6 *) addr;
1572 ppc->port = ntohs (v6->sin6_port);
1575 GNUNET_RESOLVER_hostname_get (plugin->env->sched,
1579 !numeric, timeout, &append_port, ppc);
1583 * Return the actual path to a file found in the current
1584 * PATH environment variable.
1586 * @param binary the name of the file to find
1589 get_path_from_PATH (char *binary)
1597 p = getenv ("PATH");
1600 path = GNUNET_strdup (p); /* because we write on it */
1601 buf = GNUNET_malloc (strlen (path) + 20);
1604 while (NULL != (end = strchr (pos, ':')))
1607 sprintf (buf, "%s/%s", pos, binary);
1608 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1615 sprintf (buf, "%s/%s", pos, binary);
1616 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1627 * Check whether the suid bit is set on a file.
1628 * Attempts to find the file using the current
1629 * PATH environment variable as a search path.
1631 * @param binary the name of the file to check
1634 check_gnunet_nat_binary(char *binary)
1636 struct stat statbuf;
1639 p = get_path_from_PATH (binary);
1642 if (0 != STAT (p, &statbuf))
1645 return GNUNET_SYSERR;
1648 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
1649 (statbuf.st_uid == 0) )
1655 * The exported method. Makes the core api available via a global and
1656 * returns the udp transport API.
1659 libgnunet_plugin_transport_udp_init (void *cls)
1661 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1662 unsigned long long mtu;
1663 unsigned long long port;
1664 struct GNUNET_TRANSPORT_PluginFunctions *api;
1665 struct Plugin *plugin;
1666 struct GNUNET_SERVICE_Context *service;
1667 int sockets_created;
1670 int only_nat_addresses;
1671 char *internal_address;
1672 char *external_address;
1674 service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
1675 if (service == NULL)
1677 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", _
1678 ("Failed to start service for `%s' transport plugin.\n"),
1683 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1687 /* We are behind nat (according to the user) */
1688 if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
1689 behind_nat = GNUNET_YES;
1692 behind_nat = GNUNET_NO;
1693 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");
1697 behind_nat = GNUNET_NO; /* We are not behind nat! */
1699 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1703 if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
1704 allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
1707 allow_nat = GNUNET_NO;
1708 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");
1713 allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
1715 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1717 "ONLY_NAT_ADDRESSES"))
1718 only_nat_addresses = GNUNET_YES; /* We will only report our addresses as NAT'd */
1720 only_nat_addresses = GNUNET_NO; /* We will report our addresses as NAT'd and non-NAT'd */
1722 external_address = NULL;
1723 if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
1724 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1727 &external_address)))
1729 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1732 ("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
1734 GNUNET_SERVICE_stop (service);
1738 internal_address = NULL;
1739 if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
1740 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1743 &internal_address)))
1745 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1748 ("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
1750 GNUNET_SERVICE_stop (service);
1751 GNUNET_free_non_null(external_address);
1756 GNUNET_CONFIGURATION_get_value_number (env->cfg,
1760 port = UDP_NAT_DEFAULT_PORT;
1761 else if (port > 65535)
1763 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
1765 _("Given `%s' option is out of range: %llu > %u\n"),
1769 GNUNET_SERVICE_stop (service);
1770 GNUNET_free_non_null(external_address);
1771 GNUNET_free_non_null(internal_address);
1777 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
1779 _("MTU %llu for `%s' is probably too low!\n"), mtu,
1782 plugin = GNUNET_malloc (sizeof (struct Plugin));
1783 plugin->external_address = external_address;
1784 plugin->internal_address = internal_address;
1785 plugin->port = port;
1786 plugin->behind_nat = behind_nat;
1787 plugin->allow_nat = allow_nat;
1788 plugin->only_nat_addresses = only_nat_addresses;
1791 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1794 api->send = &udp_plugin_send;
1795 api->disconnect = &udp_disconnect;
1796 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1797 api->check_address = &udp_check_address;
1799 plugin->service = service;
1801 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
1802 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
1805 HOSTNAME_RESOLVE_TIMEOUT,
1806 &process_hostname_ips,
1809 sockets_created = udp_transport_server_start (plugin);
1811 GNUNET_assert (sockets_created == 1);
1818 libgnunet_plugin_transport_udp_done (void *cls)
1820 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1821 struct Plugin *plugin = api->cls;
1823 udp_transport_server_stop (plugin);
1824 if (NULL != hostname_dns)
1826 GNUNET_RESOLVER_request_cancel (hostname_dns);
1827 hostname_dns = NULL;
1830 GNUNET_SERVICE_stop (plugin->service);
1832 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1833 GNUNET_free (plugin);
1838 /* end of plugin_transport_udp.c */