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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 * 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 * The process id of the server process (if behind NAT)
371 struct UDP_NAT_Probes *probes;
378 /* The network handle */
379 struct GNUNET_NETWORK_Handle *desc;
381 /* The port we bound to */
385 /* *********** globals ************* */
388 * the socket that we transmit all data with
390 static struct UDP_Sock_Info udp_sock;
394 * Forward declaration.
397 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result);
401 * Disconnect from a remote node. Clean up session if we have one for this peer
403 * @param cls closure for this call (should be handle to Plugin)
404 * @param target the peeridentity of the peer to disconnect
405 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
408 udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
410 /** TODO: Implement! */
415 * Shutdown the server process (stop receiving inbound traffic). Maybe
418 * @param cls Handle to the plugin for this transport
420 * @return returns the number of sockets successfully closed,
421 * should equal the number of sockets successfully opened
424 udp_transport_server_stop (void *cls)
426 struct Plugin *plugin = cls;
431 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
433 GNUNET_SCHEDULER_cancel (plugin->env->sched, plugin->select_task);
434 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
437 ok = GNUNET_NETWORK_socket_close (udp_sock.desc);
439 udp_sock.desc = NULL;
442 if (plugin->behind_nat == GNUNET_YES)
444 if (0 != PLIBC_KILL (plugin->server_pid, SIGTERM))
446 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
448 GNUNET_OS_process_wait (plugin->server_pid);
451 if (ret != GNUNET_OK)
452 return GNUNET_SYSERR;
458 find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
460 struct PeerSession *pos;
462 pos = plugin->sessions;
465 if (memcmp(&pos->target, peer, sizeof(struct GNUNET_PeerIdentity)) == 0)
475 * Actually send out the message, assume we've got the address and
476 * send_handle squared away!
479 * @param send_handle which handle to send message on
480 * @param target who should receive this message (ignored by UDP)
481 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
482 * @param msgbuf_size the size of the msgbuf to send
483 * @param priority how important is the message (ignored by UDP)
484 * @param timeout when should we time out (give up) if we can not transmit?
485 * @param addr the addr to send the message to, needs to be a sockaddr for us
486 * @param addrlen the len of addr
487 * @param cont continuation to call once the message has
488 * been transmitted (or if the transport is ready
489 * for the next transmission call; or if the
490 * peer disconnected...)
491 * @param cont_cls closure for cont
492 * @return the number of bytes written
495 udp_real_send (void *cls,
496 struct GNUNET_NETWORK_Handle *send_handle,
497 const struct GNUNET_PeerIdentity *target,
500 unsigned int priority,
501 struct GNUNET_TIME_Relative timeout,
504 GNUNET_TRANSPORT_TransmitContinuation cont,
507 struct Plugin *plugin = cls;
508 struct UDPMessage *message;
512 if ((addr == NULL) || (addrlen == 0))
515 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
516 ("udp_plugin_send called without address, returning!\n"));
518 cont (cont_cls, target, GNUNET_SYSERR);
519 return 0; /* Can never send if we don't have an address!! */
522 /* Build the message to be sent */
523 message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
524 ssize = sizeof (struct UDPMessage) + msgbuf_size;
526 message->header.size = htons (ssize);
527 message->header.type = htons (0);
528 memcpy (&message->sender, plugin->env->my_identity,
529 sizeof (struct GNUNET_PeerIdentity));
530 memcpy (&message[1], msgbuf, msgbuf_size);
532 /* Actually send the message */
534 GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
540 if (sent == GNUNET_SYSERR)
541 cont (cont_cls, target, GNUNET_SYSERR);
544 cont (cont_cls, target, GNUNET_OK);
548 GNUNET_free (message);
553 * We learned about a peer (possibly behind NAT) so run the
554 * gnunet-nat-client to send dummy ICMP responses
556 * @param plugin the plugin for this transport
557 * @param addr the address of the peer
558 * @param addrlen the length of the address
561 run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
563 char inet4[INET_ADDRSTRLEN];
564 char *address_as_string;
565 char *port_as_string;
567 const struct sockaddr *sa = (const struct sockaddr *)addr;
569 if (addrlen < sizeof (struct sockaddr))
571 switch (sa->sa_family)
574 if (addrlen != sizeof (struct sockaddr_in))
577 &((struct sockaddr_in *) sa)->sin_addr,
578 inet4, INET_ADDRSTRLEN);
579 address_as_string = GNUNET_strdup (inet4);
586 GNUNET_asprintf(&port_as_string, "%d", plugin->port);
588 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
589 _("Running gnunet-nat-client with arguments: %s %s %d\n"), plugin->external_address, address_as_string, plugin->port);
592 /* Start the server process */
593 pid = GNUNET_OS_start_process(NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, port_as_string, NULL);
594 GNUNET_free(address_as_string);
595 GNUNET_free(port_as_string);
596 GNUNET_OS_process_wait (pid);
600 * Function that can be used by the transport service to transmit
601 * a message using the plugin.
604 * @param target who should receive this message (ignored by UDP)
605 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
606 * @param msgbuf_size the size of the msgbuf to send
607 * @param priority how important is the message (ignored by UDP)
608 * @param timeout when should we time out (give up) if we can not transmit?
609 * @param session identifier used for this session (can be NULL)
610 * @param addr the addr to send the message to, needs to be a sockaddr for us
611 * @param addrlen the len of addr
612 * @param force_address not used, we had better have an address to send to
613 * because we are stateless!!
614 * @param cont continuation to call once the message has
615 * been transmitted (or if the transport is ready
616 * for the next transmission call; or if the
617 * peer disconnected...)
618 * @param cont_cls closure for cont
620 * @return the number of bytes written (may return 0 and the message can
621 * still be transmitted later!)
624 udp_plugin_send (void *cls,
625 const struct GNUNET_PeerIdentity *target,
628 unsigned int priority,
629 struct GNUNET_TIME_Relative timeout,
630 struct Session *session,
634 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
636 struct Plugin *plugin = cls;
638 struct MessageQueue *temp_message;
639 struct PeerSession *peer_session;
640 struct sockaddr_in *sockaddr = (struct sockaddr_in *)addr;
643 GNUNET_assert (NULL == session);
644 other_peer_natd = GNUNET_NO;
645 if ((sockaddr->sin_family == AF_INET) && (ntohs(sockaddr->sin_port) == 0))
647 other_peer_natd = GNUNET_YES;
652 if ((other_peer_natd == GNUNET_YES) && (plugin->allow_nat == GNUNET_YES))
654 peer_session = find_session(plugin, target);
655 if (peer_session == NULL) /* We have a new peer to add */
658 * The first time, we can assume we have no knowledge of a
659 * working port for this peer, call the ICMP/UDP message sender
662 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
663 peer_session->connect_addr = GNUNET_malloc(addrlen);
664 memcpy(peer_session->connect_addr, addr, addrlen);
665 peer_session->connect_alen = addrlen;
666 peer_session->plugin = plugin;
667 peer_session->sock = NULL;
668 memcpy(&peer_session->target, target, sizeof(struct GNUNET_PeerIdentity));
669 peer_session->expecting_welcome = GNUNET_YES;
671 peer_session->next = plugin->sessions;
672 plugin->sessions = peer_session;
674 peer_session->messages = GNUNET_malloc(sizeof(struct MessageQueue));
675 peer_session->messages->msgbuf = GNUNET_malloc(msgbuf_size);
676 memcpy(peer_session->messages->msgbuf, msgbuf, msgbuf_size);
677 peer_session->messages->msgbuf_size = msgbuf_size;
678 peer_session->messages->next = NULL;
679 peer_session->messages->timeout = GNUNET_TIME_relative_to_absolute(timeout);
680 peer_session->messages->cont = cont;
681 peer_session->messages->cont_cls = cont_cls;
683 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
684 _("Other peer is NAT'd, set up peer session for peer %s\n"), GNUNET_i2s(target));
686 run_gnunet_nat_client(plugin, addr, addrlen);
690 if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */
692 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);
694 else /* Haven't gotten a response from this peer, queue message */
696 temp_message = GNUNET_malloc(sizeof(struct MessageQueue));
697 temp_message->msgbuf = GNUNET_malloc(msgbuf_size);
698 memcpy(temp_message->msgbuf, msgbuf, msgbuf_size);
699 temp_message->msgbuf_size = msgbuf_size;
700 temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout);
701 temp_message->cont = cont;
702 temp_message->cont_cls = cont_cls;
703 temp_message->next = peer_session->messages;
704 peer_session->messages = temp_message;
708 else if (other_peer_natd == GNUNET_NO) /* Other peer not behind a NAT, so we can just send the message as is */
710 sent = udp_real_send(cls, udp_sock.desc, target, msgbuf, msgbuf_size, priority, timeout, addr, addrlen, cont, cont_cls);
712 else /* Other peer is NAT'd, but we don't want to play with them (or can't!) */
713 return GNUNET_SYSERR;
715 /* When GNUNET_SYSERR is returned from udp_real_send, we will still call
716 * the callback so must not return GNUNET_SYSERR!
717 * If we do, then transport context get freed twice. */
718 if (sent == GNUNET_SYSERR)
726 * Add the IP of our network interface to the list of
727 * our external IP addresses.
730 process_interfaces (void *cls,
733 const struct sockaddr *addr, socklen_t addrlen)
735 struct Plugin *plugin = cls;
737 struct sockaddr_in *v4;
738 struct sockaddr_in6 *v6;
740 af = addr->sa_family;
743 v4 = (struct sockaddr_in *) addr;
744 if (plugin->behind_nat == GNUNET_YES)
746 GNUNET_assert(inet_pton(AF_INET, plugin->external_address, &v4->sin_addr) == GNUNET_OK);
747 v4->sin_port = htons (0); /* Indicates to receiver we are behind NAT */
750 v4->sin_port = htons (plugin->port);
754 GNUNET_assert (af == AF_INET6);
755 v6 = (struct sockaddr_in6 *) addr;
756 if (plugin->behind_nat == GNUNET_YES)
757 v6->sin6_port = htons (0);
759 v6->sin6_port = htons (plugin->port);
762 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
763 GNUNET_ERROR_TYPE_BULK,
764 "udp", _("Found address `%s' (%s)\n"),
765 GNUNET_a2s (addr, addrlen), name);
766 plugin->env->notify_address (plugin->env->cls,
768 addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
775 * Function called by the resolver for each address obtained from DNS
776 * for our own hostname. Add the addresses to the list of our
777 * external IP addresses.
780 * @param addr one of the addresses of the host, NULL for the last address
781 * @param addrlen length of the address
784 process_hostname_ips (void *cls,
785 const struct sockaddr *addr, socklen_t addrlen)
787 struct Plugin *plugin = cls;
791 plugin->hostname_dns = NULL;
794 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
799 * Send UDP probe messages or UDP keepalive messages, depending on the
800 * state of the connection.
802 * @param cls closure for this call (should be the main Plugin)
803 * @param tc task context for running this
806 send_udp_probe_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
808 struct UDP_NAT_Probes *probe = cls;
809 struct UDP_NAT_ProbeMessage *message;
810 struct Plugin *plugin = probe->plugin;
812 message = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessage));
813 message->header.size = htons(sizeof(struct UDP_NAT_ProbeMessage));
814 message->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE);
815 /* If they gave us a port, use that. If not, try our port. */
816 if (probe->port != 0)
817 probe->sock_addr.sin_port = htons(probe->port);
819 probe->sock_addr.sin_port = htons(plugin->port);
822 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
823 _("Sending a probe to port %d\n"), ntohs(probe->sock_addr.sin_port));
828 udp_real_send(plugin, udp_sock.desc, NULL,
829 (char *)message, ntohs(message->header.size), 0,
830 GNUNET_TIME_relative_get_unit(),
831 &probe->sock_addr, sizeof(probe->sock_addr),
832 &udp_probe_continuation, probe);
834 GNUNET_free(message);
839 * Continuation for probe sends. If the last probe was sent
840 * "successfully", schedule sending of another one. If not,
844 udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result)
846 struct UDP_NAT_Probes *probe = cls;
847 struct Plugin *plugin = probe->plugin;
849 if ((result == GNUNET_OK) && (probe->count < MAX_PROBES))
852 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
853 _("Scheduling next probe for 10000 milliseconds\n"));
855 probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 10000), &send_udp_probe_message, probe);
857 else /* Destroy the probe context. */
860 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
861 _("Sending probe didn't go well...\n"));
867 * Find probe message by address
869 * @param plugin the plugin for this transport
870 * @param address_string the ip address as a string
872 struct UDP_NAT_Probes *
873 find_probe(struct Plugin *plugin, char * address_string)
875 struct UDP_NAT_Probes *pos;
877 pos = plugin->probes;
879 if (strcmp(pos->address_string, address_string) == 0)
887 * @param cls the plugin handle
888 * @param tc the scheduling context (for rescheduling this function again)
890 * We have been notified that gnunet-nat-server has written something to stdout.
891 * Handle the output, then reschedule this function to be called again once
896 udp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
898 struct Plugin *plugin = cls;
901 memset(&mybuf, 0, sizeof(mybuf));
903 struct UDP_NAT_Probes *temp_probe;
906 struct sockaddr_in in_addr;
908 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
911 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
916 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
917 _("Finished reading from server stdout with code: %d\n"), bytes);
924 for (i = 0; i < sizeof(mybuf); i++)
926 if (mybuf[i] == '\n')
929 if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
932 port_start = &mybuf[i + 1];
936 if (port_start != NULL)
937 port = atoi(port_start);
940 plugin->server_read_task =
941 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
942 GNUNET_TIME_UNIT_FOREVER_REL,
943 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
948 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
949 _("nat-server-read read: %s port %d\n"), &mybuf, port);
953 * We have received an ICMP response, ostensibly from a non-NAT'd peer
954 * that wants to connect to us! Send a message to establish a connection.
956 if (inet_pton(AF_INET, &mybuf[0], &in_addr.sin_addr) != 1)
959 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp",
960 _("nat-server-read malformed address\n"), &mybuf, port);
962 plugin->server_read_task =
963 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
964 GNUNET_TIME_UNIT_FOREVER_REL,
965 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
969 temp_probe = find_probe(plugin, &mybuf[0]);
971 if (temp_probe == NULL)
973 temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes));
974 temp_probe->address_string = strdup(&mybuf[0]);
975 temp_probe->sock_addr.sin_family = AF_INET;
976 GNUNET_assert(inet_pton(AF_INET, &mybuf[0], &temp_probe->sock_addr.sin_addr) == 1);
977 temp_probe->port = port;
978 temp_probe->next = plugin->probes;
979 temp_probe->plugin = plugin;
980 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);
981 plugin->probes = temp_probe;
984 plugin->server_read_task =
985 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
986 GNUNET_TIME_UNIT_FOREVER_REL,
987 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
993 * Demultiplexer for UDP NAT messages
995 * @param plugin the main plugin for this transport
996 * @param sender from which peer the message was received
997 * @param currhdr pointer to the header of the message
998 * @param sender_addr the address from which the message was received
999 * @param fromlen the length of the address
1000 * @param sockinfo which socket did we receive the message on
1003 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)
1005 struct UDP_NAT_ProbeMessageReply *outgoing_probe_reply;
1006 struct UDP_NAT_ProbeMessageConfirmation *outgoing_probe_confirmation;
1008 char addr_buf[INET_ADDRSTRLEN];
1009 struct UDP_NAT_Probes *outgoing_probe;
1010 struct PeerSession *peer_session;
1011 struct MessageQueue *pending_message;
1012 struct MessageQueue *pending_message_temp;
1014 if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
1017 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1018 _("Received a message from myself, dropping!!!\n"));
1023 switch (ntohs(currhdr->type))
1025 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE:
1026 /* Send probe reply */
1027 outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply));
1028 outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply));
1029 outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY);
1032 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1033 _("Received a probe on listen port %d, sent_from port %d\n"), sockinfo->port, ntohs(((struct sockaddr_in *)sender_addr)->sin_port));
1036 udp_real_send(plugin, sockinfo->desc, NULL,
1037 (char *)outgoing_probe_reply,
1038 ntohs(outgoing_probe_reply->header.size), 0,
1039 GNUNET_TIME_relative_get_unit(),
1040 sender_addr, fromlen,
1044 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1045 _("Sent PROBE REPLY to port %d on outgoing port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1047 GNUNET_free(outgoing_probe_reply);
1049 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY:
1050 /* Check for existing probe, check ports returned, send confirmation if all is well */
1052 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1053 _("Received PROBE REPLY from port %d on incoming port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
1055 /* FIXME: use nonce, then IPv6 replies could work I think... */
1056 if (sender_addr->ss_family == AF_INET)
1058 memset(&addr_buf, 0, sizeof(addr_buf));
1059 inet_ntop(AF_INET, &((struct sockaddr_in *) sender_addr)->sin_addr, addr_buf, INET_ADDRSTRLEN);
1060 outgoing_probe = find_probe(plugin, &addr_buf[0]);
1061 if (outgoing_probe != NULL)
1064 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1065 _("Sending confirmation that we were reached!\n"));
1067 outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1068 outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
1069 outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM);
1071 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);
1073 if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK)
1075 GNUNET_SCHEDULER_cancel(plugin->env->sched, outgoing_probe->task);
1076 outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK;
1077 /* Schedule task to timeout and remove probe if confirmation not received */
1079 GNUNET_free(outgoing_probe_confirmation);
1084 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1085 _("Received a probe reply, but have no record of a sent probe!\n"));
1090 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM:
1091 peer_session = find_session(plugin, sender);
1093 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1094 _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
1096 if (peer_session == NULL) /* Shouldn't this NOT happen? */
1099 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
1100 _("Peer not in list, adding (THIS MAY BE A MISTAKE) %s\n"), GNUNET_i2s(sender));
1102 peer_session = GNUNET_malloc(sizeof(struct PeerSession));
1103 peer_session->connect_addr = GNUNET_malloc(fromlen);
1104 memcpy(peer_session->connect_addr, sender_addr, fromlen);
1105 peer_session->connect_alen = fromlen;
1106 peer_session->plugin = plugin;
1107 peer_session->sock = sockinfo->desc;
1108 memcpy(&peer_session->target, sender, sizeof(struct GNUNET_PeerIdentity));
1109 peer_session->expecting_welcome = GNUNET_NO;
1111 peer_session->next = plugin->sessions;
1112 plugin->sessions = peer_session;
1114 peer_session->messages = NULL;
1116 else if (peer_session->expecting_welcome == GNUNET_YES)
1118 peer_session->expecting_welcome = GNUNET_NO;
1119 /* FIXME: There is no way to find this based on receiving port at the moment! */
1120 peer_session->sock = sockinfo->desc; /* This may matter, not sure right now... */
1121 ((struct sockaddr_in *)peer_session->connect_addr)->sin_port = ((struct sockaddr_in *) sender_addr)->sin_port;
1123 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1124 _("Received a probe confirmation, will send to peer on port %d\n"), ntohs(((struct sockaddr_in *)peer_session->connect_addr)->sin_port));
1126 if (peer_session->messages != NULL)
1129 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1130 _("Received a probe confirmation, sending queued messages.\n"));
1132 pending_message = peer_session->messages;
1134 while (pending_message != NULL)
1137 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1138 _("sending queued message %d\n"), count);
1140 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);
1141 pending_message_temp = pending_message;
1142 pending_message = pending_message->next;
1143 GNUNET_free(pending_message_temp->msgbuf);
1144 GNUNET_free(pending_message_temp);
1146 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1147 _("finished sending queued message %d\n"), count);
1157 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
1158 _("Received probe confirmation for already confirmed peer!\n"));
1161 /* Received confirmation, add peer with address/port specified */
1163 case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE:
1164 /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */
1165 /* If we receive these just ignore! */
1168 plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE,
1169 NULL, (char *)sender_addr, fromlen);
1176 * @param cls the plugin handle
1177 * @param tc the scheduling context (for rescheduling this function again)
1179 * We have been notified that our writeset has something to read. We don't
1180 * know which socket needs to be read, so we have to check each one
1181 * Then reschedule this function to be called again once more is available.
1185 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1187 struct Plugin *plugin = cls;
1189 struct UDPMessage *msg;
1190 struct GNUNET_PeerIdentity *sender;
1191 unsigned int buflen;
1193 struct sockaddr_storage addr;
1199 const struct GNUNET_MessageHeader *currhdr;
1201 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
1203 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1209 buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock.desc);
1211 if (buflen == GNUNET_NO)
1214 buf = GNUNET_malloc (buflen);
1215 fromlen = sizeof (addr);
1216 memset (&addr, 0, fromlen);
1218 GNUNET_NETWORK_socket_recvfrom (udp_sock.desc, buf, buflen,
1219 (struct sockaddr *) &addr, &fromlen);
1222 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1223 ("socket_recv returned %u, src_addr_len is %u\n"), ret,
1232 msg = (struct UDPMessage *) buf;
1235 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1236 ("header reports message size of %d, type %d\n"),
1237 ntohs (msg->header.size), ntohs (msg->header.type));
1239 if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
1245 msgbuf = (char *)&msg[1];
1246 sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1247 memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
1251 tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
1253 while (offset < tsize)
1255 currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
1257 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1258 ("processing msg %d: type %d, size %d at offset %d\n"),
1259 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1261 udp_demultiplexer(plugin, sender, currhdr, &addr, fromlen, &udp_sock);
1263 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
1264 ("processing done msg %d: type %d, size %d at offset %d\n"),
1265 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
1267 offset += ntohs(currhdr->size);
1270 GNUNET_free_non_null (buf);
1271 GNUNET_free_non_null (sender);
1274 plugin->select_task =
1275 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1276 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1277 GNUNET_SCHEDULER_NO_TASK,
1278 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1279 NULL, &udp_plugin_select, plugin);
1284 * Create a slew of UDP sockets. If possible, use IPv6, otherwise
1287 * @param cls closure for server start, should be a struct Plugin *
1289 * @return number of sockets created or GNUNET_SYSERR on error
1292 udp_transport_server_start (void *cls)
1294 struct Plugin *plugin = cls;
1295 struct sockaddr_in serverAddrv4;
1296 struct sockaddr_in6 serverAddrv6;
1297 struct sockaddr *serverAddr;
1299 int sockets_created;
1301 /* Pipe to read from started processes stdout (on read end) */
1302 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
1304 sockets_created = 0;
1305 if (plugin->server_stdout == NULL)
1306 return sockets_created;
1308 if (plugin->behind_nat == GNUNET_YES)
1311 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1313 "Starting gnunet-nat-server process cmd: %s %s\n", "gnunet-nat-server", plugin->internal_address);
1315 /* Start the server process */
1316 plugin->server_pid = GNUNET_OS_start_process(NULL, plugin->server_stdout, "gnunet-nat-server", "gnunet-nat-server", plugin->internal_address, NULL);
1317 if (plugin->server_pid == GNUNET_SYSERR)
1320 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1322 "Failed to start gnunet-nat-server process\n");
1324 return GNUNET_SYSERR;
1326 /* Close the write end of the read pipe */
1327 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
1329 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
1330 plugin->server_read_task =
1331 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
1332 GNUNET_TIME_UNIT_FOREVER_REL,
1333 plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
1336 udp_sock.desc = NULL;
1339 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
1340 if (NULL == udp_sock.desc)
1342 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
1343 return sockets_created;
1347 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
1348 #if HAVE_SOCKADDR_IN_SIN_LEN
1349 serverAddrv4.sin_len = sizeof (serverAddrv4);
1351 serverAddrv4.sin_family = AF_INET;
1352 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
1353 serverAddrv4.sin_port = htons (plugin->port);
1354 addrlen = sizeof (serverAddrv4);
1355 serverAddr = (struct sockaddr *) &serverAddrv4;
1357 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1359 "Binding to port %d\n", ntohs(serverAddrv4.sin_port));
1361 while (GNUNET_NETWORK_socket_bind (udp_sock.desc, serverAddr, addrlen) !=
1364 serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
1366 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1368 "Binding failed, trying new port %d\n", ntohs(serverAddrv4.sin_port));
1371 udp_sock.port = ntohs(serverAddrv4.sin_port);
1376 if ((udp_sock.desc == NULL) && (GNUNET_YES !=
1377 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
1380 udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
1381 if (udp_sock.desc != NULL)
1383 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
1384 #if HAVE_SOCKADDR_IN_SIN_LEN
1385 serverAddrv6.sin6_len = sizeof (serverAddrv6);
1387 serverAddrv6.sin6_family = AF_INET6;
1388 serverAddrv6.sin6_addr = in6addr_any;
1389 serverAddrv6.sin6_port = htons (plugin->port);
1390 addrlen = sizeof (serverAddrv6);
1391 serverAddr = (struct sockaddr *) &serverAddrv6;
1396 plugin->rs = GNUNET_NETWORK_fdset_create ();
1398 GNUNET_NETWORK_fdset_zero (plugin->rs);
1401 GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock.desc);
1403 plugin->select_task =
1404 GNUNET_SCHEDULER_add_select (plugin->env->sched,
1405 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
1406 GNUNET_SCHEDULER_NO_TASK,
1407 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
1408 NULL, &udp_plugin_select, plugin);
1410 return sockets_created;
1415 * Check if the given port is plausible (must be either
1416 * our listen port or our advertised port). If it is
1417 * neither, we return one of these two ports at random.
1419 * @return either in_port or a more plausible port
1422 check_port (struct Plugin *plugin, uint16_t in_port)
1425 /* FIXME: remember what ports we are using to better respond to this */
1428 for (i = plugin->starting_port; i < plugin->num_ports + plugin->starting_port; i++)
1434 return GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1435 plugin->num_ports) + plugin->starting_port;
1441 * Another peer has suggested an address for this peer and transport
1442 * plugin. Check that this could be a valid address. This function
1443 * is not expected to 'validate' the address in the sense of trying to
1444 * connect to it but simply to see if the binary format is technically
1445 * legal for establishing a connection.
1447 * @param cls closure, should be our handle to the Plugin
1448 * @param addr pointer to the address, may be modified (slightly)
1449 * @param addrlen length of addr
1450 * @return GNUNET_OK if this is a plausible address for this peer
1451 * and transport, GNUNET_SYSERR if not
1455 udp_check_address (void *cls, void *addr, size_t addrlen)
1457 struct Plugin *plugin = cls;
1458 char buf[sizeof (struct sockaddr_in6)];
1460 struct sockaddr_in *v4;
1461 struct sockaddr_in6 *v6;
1463 if ((addrlen != sizeof (struct sockaddr_in)) &&
1464 (addrlen != sizeof (struct sockaddr_in6)))
1466 GNUNET_break_op (0);
1467 return GNUNET_SYSERR;
1469 memcpy (buf, addr, sizeof (struct sockaddr_in6));
1470 if (addrlen == sizeof (struct sockaddr_in))
1472 v4 = (struct sockaddr_in *) buf;
1473 v4->sin_port = htons (check_port (plugin, ntohs (v4->sin_port)));
1477 v6 = (struct sockaddr_in6 *) buf;
1478 v6->sin6_port = htons (check_port (plugin, ntohs (v6->sin6_port)));
1482 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1484 "Informing transport service about my address `%s'.\n",
1485 GNUNET_a2s (addr, addrlen));
1492 * Append our port and forward the result.
1495 append_port (void *cls, const char *hostname)
1497 struct PrettyPrinterContext *ppc = cls;
1500 if (hostname == NULL)
1502 ppc->asc (ppc->asc_cls, NULL);
1506 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1507 ppc->asc (ppc->asc_cls, ret);
1513 * Convert the transports address to a nice, human-readable
1516 * @param cls closure
1517 * @param type name of the transport that generated the address
1518 * @param addr one of the addresses of the host, NULL for the last address
1519 * the specific address format depends on the transport
1520 * @param addrlen length of the address
1521 * @param numeric should (IP) addresses be displayed in numeric form?
1522 * @param timeout after how long should we give up?
1523 * @param asc function to call on each string
1524 * @param asc_cls closure for asc
1527 udp_plugin_address_pretty_printer (void *cls,
1532 struct GNUNET_TIME_Relative timeout,
1533 GNUNET_TRANSPORT_AddressStringCallback asc,
1536 struct Plugin *plugin = cls;
1537 const struct sockaddr_in *v4;
1538 const struct sockaddr_in6 *v6;
1539 struct PrettyPrinterContext *ppc;
1541 if ((addrlen != sizeof (struct sockaddr_in)) &&
1542 (addrlen != sizeof (struct sockaddr_in6)))
1544 /* invalid address */
1545 GNUNET_break_op (0);
1546 asc (asc_cls, NULL);
1549 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1551 ppc->asc_cls = asc_cls;
1552 if (addrlen == sizeof (struct sockaddr_in))
1554 v4 = (const struct sockaddr_in *) addr;
1555 ppc->port = ntohs (v4->sin_port);
1559 v6 = (const struct sockaddr_in6 *) addr;
1560 ppc->port = ntohs (v6->sin6_port);
1563 GNUNET_RESOLVER_hostname_get (plugin->env->sched,
1567 !numeric, timeout, &append_port, ppc);
1571 * Return the actual path to a file found in the current
1572 * PATH environment variable.
1574 * @param binary the name of the file to find
1577 get_path_from_PATH (char *binary)
1585 p = getenv ("PATH");
1588 path = GNUNET_strdup (p); /* because we write on it */
1589 buf = GNUNET_malloc (strlen (path) + 20);
1592 while (NULL != (end = strchr (pos, ':')))
1595 sprintf (buf, "%s/%s", pos, binary);
1596 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1603 sprintf (buf, "%s/%s", pos, binary);
1604 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
1615 * Check whether the suid bit is set on a file.
1616 * Attempts to find the file using the current
1617 * PATH environment variable as a search path.
1619 * @param binary the name of the file to check
1622 check_gnunet_nat_binary(char *binary)
1624 struct stat statbuf;
1627 p = get_path_from_PATH (binary);
1630 if (0 != STAT (p, &statbuf))
1633 return GNUNET_SYSERR;
1636 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
1637 (statbuf.st_uid == 0) )
1643 * The exported method. Makes the core api available via a global and
1644 * returns the udp transport API.
1647 libgnunet_plugin_transport_udp_init (void *cls)
1649 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
1650 unsigned long long mtu;
1651 unsigned long long port;
1652 struct GNUNET_TRANSPORT_PluginFunctions *api;
1653 struct Plugin *plugin;
1654 struct GNUNET_SERVICE_Context *service;
1655 int sockets_created;
1658 char *internal_address;
1659 char *external_address;
1661 service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
1662 if (service == NULL)
1664 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", _
1665 ("Failed to start service for `%s' transport plugin.\n"),
1670 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1674 /* We are behind nat (according to the user) */
1675 if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
1676 behind_nat = GNUNET_YES;
1679 behind_nat = GNUNET_NO;
1680 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");
1684 behind_nat = GNUNET_NO; /* We are not behind nat! */
1686 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
1690 if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
1691 allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
1694 allow_nat = GNUNET_NO;
1695 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");
1700 allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
1702 external_address = NULL;
1703 if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
1704 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1707 &external_address)))
1709 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1712 ("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
1714 GNUNET_SERVICE_stop (service);
1718 internal_address = NULL;
1719 if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
1720 GNUNET_CONFIGURATION_get_value_string (env->cfg,
1723 &internal_address)))
1725 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1728 ("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
1730 GNUNET_SERVICE_stop (service);
1731 GNUNET_free_non_null(external_address);
1736 GNUNET_CONFIGURATION_get_value_number (env->cfg,
1740 port = UDP_NAT_DEFAULT_PORT;
1741 else if (port > 65535)
1743 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
1745 _("Given `%s' option is out of range: %llu > %u\n"),
1749 GNUNET_SERVICE_stop (service);
1750 GNUNET_free_non_null(external_address);
1751 GNUNET_free_non_null(internal_address);
1757 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
1759 _("MTU %llu for `%s' is probably too low!\n"), mtu,
1762 plugin = GNUNET_malloc (sizeof (struct Plugin));
1763 plugin->external_address = external_address;
1764 plugin->internal_address = internal_address;
1765 plugin->port = port;
1766 plugin->behind_nat = behind_nat;
1767 plugin->allow_nat = allow_nat;
1770 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
1773 api->send = &udp_plugin_send;
1774 api->disconnect = &udp_disconnect;
1775 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
1776 api->check_address = &udp_check_address;
1778 plugin->service = service;
1780 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
1781 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
1784 HOSTNAME_RESOLVE_TIMEOUT,
1785 &process_hostname_ips,
1788 sockets_created = udp_transport_server_start (plugin);
1790 GNUNET_assert (sockets_created == 1);
1797 libgnunet_plugin_transport_udp_done (void *cls)
1799 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
1800 struct Plugin *plugin = api->cls;
1802 udp_transport_server_stop (plugin);
1803 if (NULL != hostname_dns)
1805 GNUNET_RESOLVER_request_cancel (hostname_dns);
1806 hostname_dns = NULL;
1809 GNUNET_SERVICE_stop (plugin->service);
1811 GNUNET_NETWORK_fdset_destroy (plugin->rs);
1812 GNUNET_free (plugin);
1817 /* end of plugin_transport_udp.c */