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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
65 * How long until we give up on transmitting the welcome message?
67 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
70 * Starting port for listening and sending, eventually a config value
72 #define UDP_NAT_DEFAULT_PORT 22086
75 * UDP Message-Packet header.
82 struct GNUNET_MessageHeader header;
85 * What is the identity of the sender (GNUNET_hash of public key)
87 struct GNUNET_PeerIdentity sender;
92 /* Forward definition */
95 struct PrettyPrinterContext
97 GNUNET_TRANSPORT_AddressStringCallback asc;
107 struct MessageQueue *next;
110 * Session this message belongs to
112 struct PeerSession *session;
115 * Actual message to be sent
120 * Size of message buffer to be sent
125 * When to discard this message
127 struct GNUNET_TIME_Absolute timeout;
130 * Continuation to call when this message goes out
132 GNUNET_TRANSPORT_TransmitContinuation cont;
135 * closure for continuation
142 * UDP NAT Probe message definition
144 struct UDP_NAT_ProbeMessage
149 struct GNUNET_MessageHeader header;
154 * UDP NAT Probe message reply definition
156 struct UDP_NAT_ProbeMessageReply
161 struct GNUNET_MessageHeader header;
167 * UDP NAT Probe message confirm definition
169 struct UDP_NAT_ProbeMessageConfirmation
174 struct GNUNET_MessageHeader header;
187 * Stored in a linked list.
189 struct PeerSession *next;
192 * Pointer to the global plugin struct.
194 struct Plugin *plugin;
197 * To whom are we talking to (set to our identity
198 * if we are still waiting for the welcome message)
200 struct GNUNET_PeerIdentity target;
203 * Address of the other peer (either based on our 'connect'
204 * call or on our 'accept' call).
209 * Length of connect_addr.
214 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
216 int expecting_welcome;
219 * From which socket do we need to send to this peer?
221 struct GNUNET_NETWORK_Handle *sock;
224 * Queue of messages for this peer, in the case that
225 * we have to await a connection...
227 struct MessageQueue *messages;
231 struct UDP_NAT_Probes
237 struct UDP_NAT_Probes *next;
240 * Address string that the server process returned to us
242 char *address_string;
245 * Timeout for this set of probes
247 struct GNUNET_TIME_Absolute timeout;
250 * Count of how many probes we've attempted
255 * The plugin this probe belongs to
257 struct Plugin *plugin;
260 * The task used to send these probes
262 GNUNET_SCHEDULER_TaskIdentifier task;
265 * Network address (always ipv4)
267 struct sockaddr_in sock_addr;
270 * The port to send this probe to, 0 to choose randomly
278 * Encapsulation of all of the state of the plugin.
285 struct GNUNET_TRANSPORT_PluginEnvironment *env;
288 * Handle to the network service.
290 struct GNUNET_SERVICE_Context *service;
293 * Session of peers with whom we are currently connected
295 struct PeerSession *sessions;
298 * Handle for request of hostname resolution, non-NULL if pending.
300 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
303 * ID of task used to update our addresses when one expires.
305 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
310 GNUNET_SCHEDULER_TaskIdentifier select_task;
318 * The external address given to us by the user. Must be actual
319 * outside visible address for NAT punching to work.
321 char *external_address;
324 * The internal address given to us by the user (or discovered).
326 char *internal_address;
331 struct GNUNET_NETWORK_FDSet *rs;
334 * stdout pipe handle for the gnunet-nat-server process
336 struct GNUNET_DISK_PipeHandle *server_stdout;
339 * stdout file handle (for reading) for the gnunet-nat-server process
341 const struct GNUNET_DISK_FileHandle *server_stdout_handle;
344 * ID of select gnunet-nat-server stdout read task
346 GNUNET_SCHEDULER_TaskIdentifier server_read_task;
349 * Is this transport configured to be behind a NAT?
354 * Is this transport configured to allow connections to NAT'd peers?
359 * Should this transport advertise only NAT addresses (port set to 0)?
360 * If not, all addresses will be duplicated for NAT punching and regular
363 int only_nat_addresses;
366 * The process id of the server process (if behind NAT)
373 struct UDP_NAT_Probes *probes;
380 /* The network handle */
381 struct GNUNET_NETWORK_Handle *desc;
383 /* The port we bound to */
387 /* *********** globals ************* */
390 * the socket that we transmit all data with
392 static struct UDP_Sock_Info udp_sock;
396 * Forward declaration.
399 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result);
403 * Disconnect from a remote node. Clean up session if we have one for this peer
405 * @param cls closure for this call (should be handle to Plugin)
406 * @param target the peeridentity of the peer to disconnect
407 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
410 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
412 /** TODO: Implement! */
417 * Shutdown the server process (stop receiving inbound traffic). Maybe
420 * @param cls Handle to the plugin for this transport
422 * @return returns the number of sockets successfully closed,
423 * should equal the number of sockets successfully opened
426 udp_transport_server_stop (void *cls)
428 struct Plugin *plugin = cls;
433 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
435 GNUNET_SCHEDULER_cancel (plugin->env->sched, plugin->select_task);
436 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
439 ok = GNUNET_NETWORK_socket_close (udp_sock.desc);
441 udp_sock.desc = NULL;
444 if (plugin->behind_nat == GNUNET_YES)
446 if (0 != PLIBC_KILL (plugin->server_pid, SIGTERM))
448 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
450 GNUNET_OS_process_wait (plugin->server_pid);
453 if (ret != GNUNET_OK)
454 return GNUNET_SYSERR;
460 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
462 struct PeerSession *pos;
464 pos = plugin->sessions;
467 if (memcmp(&pos->target, peer, sizeof(struct GNUNET_PeerIdentity)) == 0)
477 * Actually send out the message, assume we've got the address and
478 * send_handle squared away!
481 * @param send_handle which handle to send message on
482 * @param target who should receive this message (ignored by UDP)
483 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
484 * @param msgbuf_size the size of the msgbuf to send
485 * @param priority how important is the message (ignored by UDP)
486 * @param timeout when should we time out (give up) if we can not transmit?
487 * @param addr the addr to send the message to, needs to be a sockaddr for us
488 * @param addrlen the len of addr
489 * @param cont continuation to call once the message has
490 * been transmitted (or if the transport is ready
491 * for the next transmission call; or if the
492 * peer disconnected...)
493 * @param cont_cls closure for cont
494 * @return the number of bytes written
497 udp_real_send (void *cls,
498 struct GNUNET_NETWORK_Handle *send_handle,
499 const struct GNUNET_PeerIdentity *target,
502 unsigned int priority,
503 struct GNUNET_TIME_Relative timeout,
506 GNUNET_TRANSPORT_TransmitContinuation cont,
509 struct Plugin *plugin = cls;
510 struct UDPMessage *message;
514 if ((addr == NULL) || (addrlen == 0))
517 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
518 ("udp_plugin_send called without address, returning!\n"));
521 cont (cont_cls, target, GNUNET_SYSERR);
522 return 0; /* Can never send if we don't have an address!! */
525 /* Build the message to be sent */
526 message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
527 ssize = sizeof (struct UDPMessage) + msgbuf_size;
529 message->header.size = htons (ssize);
530 message->header.type = htons (0);
531 memcpy (&message->sender, plugin->env->my_identity,
532 sizeof (struct GNUNET_PeerIdentity));
533 memcpy (&message[1], msgbuf, msgbuf_size);
535 /* Actually send the message */
537 GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
543 if (sent == GNUNET_SYSERR)
544 cont (cont_cls, target, GNUNET_SYSERR);
547 cont (cont_cls, target, GNUNET_OK);
551 GNUNET_free (message);
556 * We learned about a peer (possibly behind NAT) so run the
557 * gnunet-nat-client to send dummy ICMP responses
559 * @param plugin the plugin for this transport
560 * @param addr the address of the peer
561 * @param addrlen the length of the address
564 run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
566 char inet4[INET_ADDRSTRLEN];
567 char *address_as_string;
568 char *port_as_string;
570 const struct sockaddr *sa = (const struct sockaddr *)addr;
572 if (addrlen < sizeof (struct sockaddr))
574 switch (sa->sa_family)
577 if (addrlen != sizeof (struct sockaddr_in))
579 if (NULL == inet_ntop (AF_INET,
580 &((struct sockaddr_in *) sa)->sin_addr,
581 inet4, INET_ADDRSTRLEN))
583 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
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->timeout = GNUNET_TIME_relative_to_absolute(timeout);
686 peer_session->messages->cont = cont;
687 peer_session->messages->cont_cls = cont_cls;
689 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
690 _("Other peer is NAT'd, set up peer session for peer %s\n"), GNUNET_i2s(target));
692 run_gnunet_nat_client(plugin, addr, addrlen);
696 if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */
698 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);
700 else /* Haven't gotten a response from this peer, queue message */
702 temp_message = GNUNET_malloc(sizeof(struct MessageQueue));
703 temp_message->msgbuf = GNUNET_malloc(msgbuf_size);
704 memcpy(temp_message->msgbuf, msgbuf, msgbuf_size);
705 temp_message->msgbuf_size = msgbuf_size;
706 temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout);
707 temp_message->cont = cont;
708 temp_message->cont_cls = cont_cls;
709 temp_message->next = peer_session->messages;
710 peer_session->messages = temp_message;
714 else if (other_peer_natd == GNUNET_NO) /* Other peer not behind a NAT, so we can just send the message as is */
716 sent = udp_real_send(cls, udp_sock.desc, target, msgbuf, msgbuf_size, priority, timeout, addr, addrlen, cont, cont_cls);
718 else /* Other peer is NAT'd, but we don't want to play with them (or can't!) */
719 return GNUNET_SYSERR;
721 /* When GNUNET_SYSERR is returned from udp_real_send, we will still call
722 * the callback so must not return GNUNET_SYSERR!
723 * If we do, then transport context get freed twice. */
724 if (sent == GNUNET_SYSERR)
732 * Add the IP of our network interface to the list of
733 * our external IP addresses.
736 process_interfaces (void *cls,
739 const struct sockaddr *addr, socklen_t addrlen)
741 struct Plugin *plugin = cls;
743 struct sockaddr_in *v4;
744 struct sockaddr_in6 *v6;
745 struct sockaddr *addr_nat;
748 af = addr->sa_family;
751 v4 = (struct sockaddr_in *) addr;
752 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
754 v4->sin_port = htons (0); /* Indicates to receiver we are behind NAT */
756 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
758 addr_nat = GNUNET_malloc(addrlen);
759 memcpy(addr_nat, addr, addrlen);
760 v4 = (struct sockaddr_in *) addr_nat;
761 v4->sin_port = htons(plugin->port);
765 v4->sin_port = htons (plugin->port);
770 GNUNET_assert (af == AF_INET6);
771 v6 = (struct sockaddr_in6 *) addr;
772 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
774 v6->sin6_port = htons (0);
776 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
778 addr_nat = GNUNET_malloc(addrlen);
779 memcpy(addr_nat, addr, addrlen);
780 v6 = (struct sockaddr_in6 *) addr_nat;
781 v6->sin6_port = htons(plugin->port);
785 v6->sin6_port = htons (plugin->port);
789 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
790 GNUNET_ERROR_TYPE_BULK,
791 "udp", _("Found address `%s' (%s)\n"),
792 GNUNET_a2s (addr, addrlen), name);
794 if (addr_nat != NULL)
796 plugin->env->notify_address (plugin->env->cls,
798 addr_nat, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
799 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
800 GNUNET_ERROR_TYPE_BULK,
801 "udp", _("Found NAT address `%s' (%s)\n"),
802 GNUNET_a2s (addr_nat, addrlen), name);
803 GNUNET_free(addr_nat);
806 plugin->env->notify_address (plugin->env->cls,
808 addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
815 * Function called by the resolver for each address obtained from DNS
816 * for our own hostname. Add the addresses to the list of our
817 * external IP addresses.
820 * @param addr one of the addresses of the host, NULL for the last address
821 * @param addrlen length of the address
824 process_hostname_ips (void *cls,
825 const struct sockaddr *addr, socklen_t addrlen)
827 struct Plugin *plugin = cls;
831 plugin->hostname_dns = NULL;
834 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
839 * Send UDP probe messages or UDP keepalive messages, depending on the
840 * state of the connection.
842 * @param cls closure for this call (should be the main Plugin)
843 * @param tc task context for running this
846 send_udp_probe_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
848 struct UDP_NAT_Probes *probe = cls;
849 struct UDP_NAT_ProbeMessage *message;
850 struct Plugin *plugin = probe->plugin;
852 message = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessage));
853 message->header.size = htons(sizeof(struct UDP_NAT_ProbeMessage));
854 message->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE);
855 /* If they gave us a port, use that. If not, try our port. */
856 if (probe->port != 0)
857 probe->sock_addr.sin_port = htons(probe->port);
859 probe->sock_addr.sin_port = htons(plugin->port);
862 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
863 _("Sending a probe to port %d\n"), ntohs(probe->sock_addr.sin_port));
868 udp_real_send(plugin, udp_sock.desc, NULL,
869 (char *)message, ntohs(message->header.size), 0,
870 GNUNET_TIME_relative_get_unit(),
871 &probe->sock_addr, sizeof(probe->sock_addr),
872 &udp_probe_continuation, probe);
874 GNUNET_free(message);
879 * Continuation for probe sends. If the last probe was sent
880 * "successfully", schedule sending of another one. If not,
884 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result)
886 struct UDP_NAT_Probes *probe = cls;
887 struct Plugin *plugin = probe->plugin;
889 if ((result == GNUNET_OK) && (probe->count < MAX_PROBES))
892 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
893 _("Scheduling next probe for 10000 milliseconds\n"));
895 probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 10000), &send_udp_probe_message, probe);
897 else /* Destroy the probe context. */
900 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
901 _("Sending probe didn't go well...\n"));
907 * Find probe message by address
909 * @param plugin the plugin for this transport
910 * @param address_string the ip address as a string
912 struct UDP_NAT_Probes *
913 find_probe(struct Plugin *plugin, char * address_string)
915 struct UDP_NAT_Probes *pos;
917 pos = plugin->probes;
919 if (strcmp(pos->address_string, address_string) == 0)
927 * @param cls the plugin handle
928 * @param tc the scheduling context (for rescheduling this function again)
930 * We have been notified that gnunet-nat-server has written something to stdout.
931 * Handle the output, then reschedule this function to be called again once
936 udp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
938 struct Plugin *plugin = cls;
941 memset(&mybuf, 0, sizeof(mybuf));
943 struct UDP_NAT_Probes *temp_probe;
946 struct sockaddr_in in_addr;
948 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
951 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
956 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
957 _("Finished reading from server stdout with code: %d\n"), bytes);
964 for (i = 0; i < sizeof(mybuf); i++)
966 if (mybuf[i] == '\n')
969 if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
972 port_start = &mybuf[i + 1];
976 if (port_start != NULL)
977 port = atoi(port_start);
980 plugin->server_read_task =
981 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
982 GNUNET_TIME_UNIT_FOREVER_REL,
983 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
988 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
989 _("nat-server-read read: %s port %d\n"), &mybuf, port);
993 * We have received an ICMP response, ostensibly from a non-NAT'd peer
994 * that wants to connect to us! Send a message to establish a connection.
996 if (inet_pton(AF_INET, &mybuf[0], &in_addr.sin_addr) != 1)
999 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp",
1000 _("nat-server-read malformed address\n"), &mybuf, port);
1002 plugin->server_read_task =
1003 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1004 GNUNET_TIME_UNIT_FOREVER_REL,
1005 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1009 temp_probe = find_probe(plugin, &mybuf[0]);
1011 if (temp_probe == NULL)
1013 temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes));
1014 temp_probe->address_string = strdup(&mybuf[0]);
1015 temp_probe->sock_addr.sin_family = AF_INET;
1016 GNUNET_assert(inet_pton(AF_INET, &mybuf[0], &temp_probe->sock_addr.sin_addr) == 1);
1017 temp_probe->port = port;
1018 temp_probe->next = plugin->probes;
1019 temp_probe->plugin = plugin;
1020 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);
1021 plugin->probes = temp_probe;
1024 plugin->server_read_task =
1025 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1026 GNUNET_TIME_UNIT_FOREVER_REL,
1027 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1033 * Demultiplexer for UDP NAT messages
1035 * @param plugin the main plugin for this transport
1036 * @param sender from which peer the message was received
1037 * @param currhdr pointer to the header of the message
1038 * @param sender_addr the address from which the message was received
1039 * @param fromlen the length of the address
1040 * @param sockinfo which socket did we receive the message on
1043 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)
1045 struct UDP_NAT_ProbeMessageReply *outgoing_probe_reply;
1046 struct UDP_NAT_ProbeMessageConfirmation *outgoing_probe_confirmation;
1048 char addr_buf[INET_ADDRSTRLEN];
1049 struct UDP_NAT_Probes *outgoing_probe;
1050 struct PeerSession *peer_session;
1051 struct MessageQueue *pending_message;
1052 struct MessageQueue *pending_message_temp;
1054 if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
1057 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1058 _("Received a message from myself, dropping!!!\n"));
1063 switch (ntohs(currhdr->type))
1065 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE:
1066 /* Send probe reply */
1067 outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply));
1068 outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply));
1069 outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY);
1072 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1073 _("Received a probe on listen port %d, sent_from port %d\n"), sockinfo->port, ntohs(((struct sockaddr_in *)sender_addr)->sin_port));
1076 udp_real_send(plugin, sockinfo->desc, NULL,
1077 (char *)outgoing_probe_reply,
1078 ntohs(outgoing_probe_reply->header.size), 0,
1079 GNUNET_TIME_relative_get_unit(),
1080 sender_addr, fromlen,
1084 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1085 _("Sent PROBE REPLY to port %d on outgoing port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1087 GNUNET_free(outgoing_probe_reply);
1089 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY:
1090 /* Check for existing probe, check ports returned, send confirmation if all is well */
1092 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1093 _("Received PROBE REPLY from port %d on incoming port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1095 if (sender_addr->ss_family == AF_INET)
1097 memset(&addr_buf, 0, sizeof(addr_buf));
1098 if (NULL == inet_ntop (AF_INET,
1099 &((struct sockaddr_in *) sender_addr)->sin_addr, addr_buf,
1102 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
1105 outgoing_probe = find_probe(plugin, &addr_buf[0]);
1106 if (outgoing_probe != NULL)
1109 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1110 _("Sending confirmation that we were reached!\n"));
1112 outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1113 outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1114 outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM);
1116 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);
1118 if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK)
1120 GNUNET_SCHEDULER_cancel(plugin->env->sched, outgoing_probe->task);
1121 outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK;
1122 /* Schedule task to timeout and remove probe if confirmation not received */
1124 GNUNET_free(outgoing_probe_confirmation);
1129 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1130 _("Received a probe reply, but have no record of a sent probe!\n"));
1135 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM:
1136 peer_session = find_session(plugin, sender);
1138 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1139 _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
1141 if (peer_session == NULL) /* Shouldn't this NOT happen? */
1144 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1145 _("Peer not in list, adding (THIS MAY BE A MISTAKE) %s\n"), GNUNET_i2s(sender));
1147 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
1148 peer_session->connect_addr = GNUNET_malloc(fromlen);
1149 memcpy(peer_session->connect_addr, sender_addr, fromlen);
1150 peer_session->connect_alen = fromlen;
1151 peer_session->plugin = plugin;
1152 peer_session->sock = sockinfo->desc;
1153 memcpy(&peer_session->target, sender, sizeof(struct GNUNET_PeerIdentity));
1154 peer_session->expecting_welcome = GNUNET_NO;
1156 peer_session->next = plugin->sessions;
1157 plugin->sessions = peer_session;
1159 peer_session->messages = NULL;
1161 else if (peer_session->expecting_welcome == GNUNET_YES)
1163 peer_session->expecting_welcome = GNUNET_NO;
1164 peer_session->sock = sockinfo->desc;
1165 ((struct sockaddr_in *)peer_session->connect_addr)->sin_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1167 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1168 _("Received a probe confirmation, will send to peer on port %d\n"), ntohs(((struct sockaddr_in *)peer_session->connect_addr)->sin_port));
1170 if (peer_session->messages != NULL)
1173 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1174 _("Received a probe confirmation, sending queued messages.\n"));
1176 pending_message = peer_session->messages;
1178 while (pending_message != NULL)
1181 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1182 _("sending queued message %d\n"), count);
1184 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);
1185 pending_message_temp = pending_message;
1186 pending_message = pending_message->next;
1187 GNUNET_free(pending_message_temp->msgbuf);
1188 GNUNET_free(pending_message_temp);
1190 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1191 _("finished sending queued message %d\n"), count);
1201 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1202 _("Received probe confirmation for already confirmed peer!\n"));
1205 /* Received confirmation, add peer with address/port specified */
1207 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE:
1208 /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */
1209 /* If we receive these just ignore! */
1212 plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE,
1213 NULL, (char *)sender_addr, fromlen);
1220 * @param cls the plugin handle
1221 * @param tc the scheduling context (for rescheduling this function again)
1223 * We have been notified that our writeset has something to read. We don't
1224 * know which socket needs to be read, so we have to check each one
1225 * Then reschedule this function to be called again once more is available.
1229 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1231 struct Plugin *plugin = cls;
1233 struct UDPMessage *msg;
1234 struct GNUNET_PeerIdentity *sender;
1235 unsigned int buflen;
1237 struct sockaddr_storage addr;
1243 const struct GNUNET_MessageHeader *currhdr;
1245 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1247 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1253 buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock.desc);
1255 if (buflen == GNUNET_NO)
1258 buf = GNUNET_malloc (buflen);
1259 fromlen = sizeof (addr);
1260 memset (&addr, 0, fromlen);
1262 GNUNET_NETWORK_socket_recvfrom (udp_sock.desc, buf, buflen,
1263 (struct sockaddr *) &addr, &fromlen);
1266 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1267 ("socket_recv returned %u, src_addr_len is %u\n"), ret,
1276 msg = (struct UDPMessage *) buf;
1279 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1280 ("header reports message size of %d, type %d\n"),
1281 ntohs (msg->header.size), ntohs (msg->header.type));
1283 if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
1289 msgbuf = (char *)&msg[1];
1290 sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1291 memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1295 tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
1297 while (offset < tsize)
1299 currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
1301 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1302 ("processing msg %d: type %d, size %d at offset %d\n"),
1303 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1305 udp_demultiplexer(plugin, sender, currhdr, &addr, fromlen, &udp_sock);
1307 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1308 ("processing done msg %d: type %d, size %d at offset %d\n"),
1309 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1311 offset += ntohs(currhdr->size);
1314 GNUNET_free_non_null (buf);
1315 GNUNET_free_non_null (sender);
1318 plugin->select_task =
1319 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1320 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1321 GNUNET_SCHEDULER_NO_TASK,
1322 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1323 NULL, &udp_plugin_select, plugin);
1328 * Create a slew of UDP sockets. If possible, use IPv6, otherwise
1331 * @param cls closure for server start, should be a struct Plugin *
1333 * @return number of sockets created or GNUNET_SYSERR on error
1336 udp_transport_server_start (void *cls)
1338 struct Plugin *plugin = cls;
1339 struct sockaddr_in serverAddrv4;
1340 struct sockaddr_in6 serverAddrv6;
1341 struct sockaddr *serverAddr;
1343 int sockets_created;
1345 sockets_created = 0;
1347 if (plugin->behind_nat == GNUNET_YES)
1349 /* Pipe to read from started processes stdout (on read end) */
1350 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
1351 if (plugin->server_stdout == NULL)
1352 return sockets_created;
1354 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1356 "Starting gnunet-nat-server process cmd: %s %s\n", "gnunet-nat-server", plugin->internal_address);
1358 /* Start the server process */
1359 plugin->server_pid = GNUNET_OS_start_process(NULL, plugin->server_stdout, "gnunet-nat-server", "gnunet-nat-server", plugin->internal_address, NULL);
1360 if (plugin->server_pid == GNUNET_SYSERR)
1363 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1365 "Failed to start gnunet-nat-server process\n");
1367 return GNUNET_SYSERR;
1369 /* Close the write end of the read pipe */
1370 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
1372 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
1373 plugin->server_read_task =
1374 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1375 GNUNET_TIME_UNIT_FOREVER_REL,
1376 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1379 udp_sock.desc = NULL;
1382 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
1383 if (NULL == udp_sock.desc)
1385 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
1386 return sockets_created;
1390 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1391 #if HAVE_SOCKADDR_IN_SIN_LEN
1392 serverAddrv4.sin_len = sizeof (serverAddrv4);
1394 serverAddrv4.sin_family = AF_INET;
1395 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1396 serverAddrv4.sin_port = htons (plugin->port);
1397 addrlen = sizeof (serverAddrv4);
1398 serverAddr = (struct sockaddr *) &serverAddrv4;
1400 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1402 "Binding to port %d\n", ntohs(serverAddrv4.sin_port));
1404 while (GNUNET_NETWORK_socket_bind (udp_sock.desc, serverAddr, addrlen) !=
1407 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1409 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1411 "Binding failed, trying new port %d\n", ntohs(serverAddrv4.sin_port));
1414 udp_sock.port = ntohs(serverAddrv4.sin_port);
1419 if ((udp_sock.desc == NULL) && (GNUNET_YES !=
1420 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
1423 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
1424 if (udp_sock.desc != NULL)
1426 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1427 #if HAVE_SOCKADDR_IN_SIN_LEN
1428 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1430 serverAddrv6.sin6_family = AF_INET6;
1431 serverAddrv6.sin6_addr = in6addr_any;
1432 serverAddrv6.sin6_port = htons (plugin->port);
1433 addrlen = sizeof (serverAddrv6);
1434 serverAddr = (struct sockaddr *) &serverAddrv6;
1439 plugin->rs = GNUNET_NETWORK_fdset_create ();
1441 GNUNET_NETWORK_fdset_zero (plugin->rs);
1444 GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock.desc);
1446 plugin->select_task =
1447 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1448 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1449 GNUNET_SCHEDULER_NO_TASK,
1450 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1451 NULL, &udp_plugin_select, plugin);
1453 return sockets_created;
1458 * Another peer has suggested an address for this peer and transport
1459 * plugin. Check that this could be a valid address. This function
1460 * is not expected to 'validate' the address in the sense of trying to
1461 * connect to it but simply to see if the binary format is technically
1462 * legal for establishing a connection.
1464 * @param cls closure, should be our handle to the Plugin
1465 * @param addr pointer to the address, may be modified (slightly)
1466 * @param addrlen length of addr
1467 * @return GNUNET_OK if this is a plausible address for this peer
1468 * and transport, GNUNET_SYSERR if not
1472 udp_check_address (void *cls, void *addr, size_t addrlen)
1474 struct Plugin *plugin = cls;
1475 char buf[sizeof (struct sockaddr_in6)];
1477 struct sockaddr_in *v4;
1478 struct sockaddr_in6 *v6;
1480 if ((addrlen != sizeof (struct sockaddr_in)) &&
1481 (addrlen != sizeof (struct sockaddr_in6)))
1483 GNUNET_break_op (0);
1484 return GNUNET_SYSERR;
1486 memcpy (buf, addr, sizeof (struct sockaddr_in6));
1487 if (addrlen == sizeof (struct sockaddr_in))
1489 v4 = (struct sockaddr_in *) buf;
1490 v4->sin_port = htons (plugin->port);
1494 v6 = (struct sockaddr_in6 *) buf;
1495 v6->sin6_port = htons (plugin->port);
1499 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1501 "Informing transport service about my address `%s'.\n",
1502 GNUNET_a2s (addr, addrlen));
1509 * Append our port and forward the result.
1512 append_port (void *cls, const char *hostname)
1514 struct PrettyPrinterContext *ppc = cls;
1517 if (hostname == NULL)
1519 ppc->asc (ppc->asc_cls, NULL);
1523 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1524 ppc->asc (ppc->asc_cls, ret);
1530 * Convert the transports address to a nice, human-readable
1533 * @param cls closure
1534 * @param type name of the transport that generated the address
1535 * @param addr one of the addresses of the host, NULL for the last address
1536 * the specific address format depends on the transport
1537 * @param addrlen length of the address
1538 * @param numeric should (IP) addresses be displayed in numeric form?
1539 * @param timeout after how long should we give up?
1540 * @param asc function to call on each string
1541 * @param asc_cls closure for asc
1544 udp_plugin_address_pretty_printer (void *cls,
1549 struct GNUNET_TIME_Relative timeout,
1550 GNUNET_TRANSPORT_AddressStringCallback asc,
1553 struct Plugin *plugin = cls;
1554 const struct sockaddr_in *v4;
1555 const struct sockaddr_in6 *v6;
1556 struct PrettyPrinterContext *ppc;
1558 if ((addrlen != sizeof (struct sockaddr_in)) &&
1559 (addrlen != sizeof (struct sockaddr_in6)))
1561 /* invalid address */
1562 GNUNET_break_op (0);
1563 asc (asc_cls, NULL);
1566 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1568 ppc->asc_cls = asc_cls;
1569 if (addrlen == sizeof (struct sockaddr_in))
1571 v4 = (const struct sockaddr_in *) addr;
1572 ppc->port = ntohs (v4->sin_port);
1576 v6 = (const struct sockaddr_in6 *) addr;
1577 ppc->port = ntohs (v6->sin6_port);
1580 GNUNET_RESOLVER_hostname_get (plugin->env->sched,
1584 !numeric, timeout, &append_port, ppc);
1588 * Return the actual path to a file found in the current
1589 * PATH environment variable.
1591 * @param binary the name of the file to find
1594 get_path_from_PATH (char *binary)
1602 p = getenv ("PATH");
1605 path = GNUNET_strdup (p); /* because we write on it */
1606 buf = GNUNET_malloc (strlen (path) + 20);
1609 while (NULL != (end = strchr (pos, ':')))
1612 sprintf (buf, "%s/%s", pos, binary);
1613 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1620 sprintf (buf, "%s/%s", pos, binary);
1621 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1632 * Check whether the suid bit is set on a file.
1633 * Attempts to find the file using the current
1634 * PATH environment variable as a search path.
1636 * @param binary the name of the file to check
1639 check_gnunet_nat_binary(char *binary)
1641 struct stat statbuf;
1644 p = get_path_from_PATH (binary);
1647 if (0 != STAT (p, &statbuf))
1650 return GNUNET_SYSERR;
1653 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
1654 (statbuf.st_uid == 0) )
1660 * The exported method. Makes the core api available via a global and
1661 * returns the udp transport API.
1664 libgnunet_plugin_transport_udp_init (void *cls)
1666 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1667 unsigned long long mtu;
1668 unsigned long long port;
1669 struct GNUNET_TRANSPORT_PluginFunctions *api;
1670 struct Plugin *plugin;
1671 struct GNUNET_SERVICE_Context *service;
1672 int sockets_created;
1675 int only_nat_addresses;
1676 char *internal_address;
1677 char *external_address;
1678 struct sockaddr_in in_addr;
1680 service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
1681 if (service == NULL)
1683 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", _
1684 ("Failed to start service for `%s' transport plugin.\n"),
1689 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1693 /* We are behind nat (according to the user) */
1694 if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
1695 behind_nat = GNUNET_YES;
1698 behind_nat = GNUNET_NO;
1699 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");
1703 behind_nat = GNUNET_NO; /* We are not behind nat! */
1705 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1709 if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
1710 allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
1713 allow_nat = GNUNET_NO;
1714 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");
1719 allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
1721 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1723 "ONLY_NAT_ADDRESSES"))
1724 only_nat_addresses = GNUNET_YES; /* We will only report our addresses as NAT'd */
1726 only_nat_addresses = GNUNET_NO; /* We will report our addresses as NAT'd and non-NAT'd */
1728 external_address = NULL;
1729 if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
1730 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1733 &external_address)))
1735 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1738 ("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
1740 GNUNET_SERVICE_stop (service);
1744 if ((external_address != NULL) && (inet_pton(AF_INET, external_address, &in_addr.sin_addr) != 1))
1746 GNUNET_log_from(GNUNET_ERROR_TYPE_WARNING, "udp", "Malformed EXTERNAL_ADDRESS %s given in configuration!\n", external_address);
1749 internal_address = NULL;
1750 if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
1751 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1754 &internal_address)))
1756 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1759 ("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
1761 GNUNET_SERVICE_stop (service);
1762 GNUNET_free_non_null(external_address);
1766 if ((internal_address != NULL) && (inet_pton(AF_INET, internal_address, &in_addr.sin_addr) != 1))
1768 GNUNET_log_from(GNUNET_ERROR_TYPE_WARNING, "udp", "Malformed INTERNAL_ADDRESS %s given in configuration!\n", internal_address);
1772 GNUNET_CONFIGURATION_get_value_number (env->cfg,
1776 port = UDP_NAT_DEFAULT_PORT;
1777 else if (port > 65535)
1779 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
1781 _("Given `%s' option is out of range: %llu > %u\n"),
1785 GNUNET_SERVICE_stop (service);
1786 GNUNET_free_non_null(external_address);
1787 GNUNET_free_non_null(internal_address);
1793 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
1795 _("MTU %llu for `%s' is probably too low!\n"), mtu,
1798 plugin = GNUNET_malloc (sizeof (struct Plugin));
1799 plugin->external_address = external_address;
1800 plugin->internal_address = internal_address;
1801 plugin->port = port;
1802 plugin->behind_nat = behind_nat;
1803 plugin->allow_nat = allow_nat;
1804 plugin->only_nat_addresses = only_nat_addresses;
1807 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1810 api->send = &udp_plugin_send;
1811 api->disconnect = &udp_disconnect;
1812 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1813 api->check_address = &udp_check_address;
1815 plugin->service = service;
1817 if (plugin->behind_nat == GNUNET_NO)
1819 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
1822 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
1825 HOSTNAME_RESOLVE_TIMEOUT,
1826 &process_hostname_ips,
1829 if ((plugin->behind_nat == GNUNET_YES) && (inet_pton(AF_INET, plugin->external_address, &in_addr.sin_addr) == 1))
1831 in_addr.sin_port = htons(0);
1832 in_addr.sin_family = AF_INET;
1833 plugin->env->notify_address (plugin->env->cls,
1835 &in_addr, sizeof(in_addr), GNUNET_TIME_UNIT_FOREVER_REL);
1837 else if ((plugin->external_address != NULL) && (inet_pton(AF_INET, plugin->external_address, &in_addr.sin_addr) == 1))
1839 in_addr.sin_port = htons(plugin->port);
1840 in_addr.sin_family = AF_INET;
1841 plugin->env->notify_address (plugin->env->cls,
1843 &in_addr, sizeof(in_addr), GNUNET_TIME_UNIT_FOREVER_REL);
1846 sockets_created = udp_transport_server_start (plugin);
1848 GNUNET_assert (sockets_created == 1);
1854 libgnunet_plugin_transport_udp_done (void *cls)
1856 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1857 struct Plugin *plugin = api->cls;
1859 udp_transport_server_stop (plugin);
1860 if (NULL != plugin->hostname_dns)
1862 GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
1863 plugin->hostname_dns = NULL;
1866 GNUNET_SERVICE_stop (plugin->service);
1868 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1869 GNUNET_free (plugin);
1874 /* end of plugin_transport_udp.c */