From e1fe5a5ca9711cb615e4c85daf002364592814b9 Mon Sep 17 00:00:00 2001 From: "Nathan S. Evans" Date: Fri, 19 Feb 2010 13:33:17 +0000 Subject: [PATCH] semi functional nat punchy dealy --- src/transport/plugin_transport_udp_nat.c | 1627 +++++++++++++++++ src/transport/test_transport_api.c | 68 +- .../test_transport_api_udp_nat_peer1.conf | 137 ++ .../test_transport_api_udp_nat_peer2.conf | 137 ++ 4 files changed, 1926 insertions(+), 43 deletions(-) create mode 100644 src/transport/plugin_transport_udp_nat.c create mode 100644 src/transport/test_transport_api_udp_nat_peer1.conf create mode 100644 src/transport/test_transport_api_udp_nat_peer2.conf diff --git a/src/transport/plugin_transport_udp_nat.c b/src/transport/plugin_transport_udp_nat.c new file mode 100644 index 000000000..afa731a38 --- /dev/null +++ b/src/transport/plugin_transport_udp_nat.c @@ -0,0 +1,1627 @@ +/* + This file is part of GNUnet + (C) 2010 Christian Grothoff (and other contributing authors) + + GNUnet is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 2, or (at your + option) any later version. + + GNUnet is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with GNUnet; see the file COPYING. If not, write to the + Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. +*/ + +/** + * @file transport/plugin_transport_udp.c + * @brief Implementation of the UDP NAT punching + * transport service + * @author Christian Grothoff + * @author Nathan Evans + * + * The idea with this transport is to connect gnunet peers to each other + * when one or both is behind a NAT. This is based on pwnat + * (http://samy.pl/pwnat) created by Samy Kamkar. This transport will + * take external IP addresses for a NAT'd peer, start a server daemon + * which sends ICMP messages out to a predefined address. Then it forks + * a client process which sends ICMP death messages to the given external + * IP address for the other peer (which has already also started the + * server). If everything works according to plan, the transport will + * be given a port which has worked to punch into the other external + * addresses NAT to communicate with the other gnunet peer. Then keep + * alive messages will be sent every (???)ms or so to keep the tunnel + * safe. + */ + +#include "platform.h" +#include "gnunet_hello_lib.h" +#include "gnunet_connection_lib.h" +#include "gnunet_os_lib.h" +#include "gnunet_peerinfo_service.h" +#include "gnunet_protocols.h" +#include "gnunet_resolver_service.h" +#include "gnunet_server_lib.h" +#include "gnunet_service_lib.h" +#include "gnunet_signatures.h" +#include "gnunet_statistics_service.h" +#include "gnunet_transport_service.h" +#include "plugin_transport.h" +#include "transport.h" + +#define DEBUG_UDP_NAT GNUNET_YES + +/* + * Transport cost to peer, always 1 for UDP (direct connection) + */ +#define UDP_DIRECT_DISTANCE 1 + +/** + * Handle for request of hostname resolution, non-NULL if pending. + */ +static struct GNUNET_RESOLVER_RequestHandle *hostname_dns; + +/** + * How long until we give up on transmitting the welcome message? + */ +#define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5) + +/* + * How many ports do we want to listen on (and send on) in order to get replies? + * + * FIXME: make this value dynamic, specified by configuration + */ +#define UDP_NAT_LISTEN_PORTS 1 + +/* + * Starting port for listening and sending, eventually a config value + */ +#define UDP_NAT_STARTING_PORT 24857 + +/** + * UDP Message-Packet header. + */ +struct UDPMessage +{ + /** + * Message header. + */ + struct GNUNET_MessageHeader header; + + /** + * What is the identity of the sender (GNUNET_hash of public key) + */ + struct GNUNET_PeerIdentity sender; + +}; + + +/** + * UDP NAT Probe message definition + */ +struct UDP_NAT_ProbeMessage +{ + /** + * Message header + */ + struct GNUNET_MessageHeader header; + +}; + +/** + * UDP NAT Probe message reply definition + */ +struct UDP_NAT_ProbeMessageReply +{ + /** + * Message header + */ + struct GNUNET_MessageHeader header; + +}; + + +/** + * UDP NAT Probe message confirm definition + */ +struct UDP_NAT_ProbeMessageConfirmation +{ + /** + * Message header + */ + struct GNUNET_MessageHeader header; + +}; + + + +/* Forward definition */ +struct Plugin; + +struct PrettyPrinterContext +{ + GNUNET_TRANSPORT_AddressStringCallback asc; + void *asc_cls; + uint16_t port; +}; + +struct MessageQueue +{ + /** + * Linked List + */ + struct MessageQueue *next; + + /** + * Session this message belongs to + */ + struct PeerSession *session; + + /** + * Actual message to be sent + */ + char *msgbuf; + + /** + * Size of message buffer to be sent + */ + size_t msgbuf_size; + + /** + * When to discard this message + */ + struct GNUNET_TIME_Absolute timeout; + + /** + * Continuation to call when this message goes out + */ + GNUNET_TRANSPORT_TransmitContinuation cont; + + /** + * closure for continuation + */ + void *cont_cls; + +}; + +/** + * UDP NAT "Session" + */ +struct PeerSession +{ + + /** + * Stored in a linked list. + */ + struct PeerSession *next; + + /** + * Pointer to the global plugin struct. + */ + struct Plugin *plugin; + + /** + * To whom are we talking to (set to our identity + * if we are still waiting for the welcome message) + */ + struct GNUNET_PeerIdentity target; + + /** + * Address of the other peer (either based on our 'connect' + * call or on our 'accept' call). + */ + void *connect_addr; + + /** + * Length of connect_addr. + */ + size_t connect_alen; + + /** + * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO) + */ + int expecting_welcome; + + /** + * From which socket do we need to send to this peer? + */ + struct GNUNET_NETWORK_Handle *sock; + + /* + * Queue of messages for this peer, in the case that + * we have to await a connection... + */ + struct MessageQueue *messages; + +}; + + +struct UDP_NAT_Probes +{ + + /** + * Linked list + */ + struct UDP_NAT_Probes *next; + + /** + * Address string that the server process returned to us + */ + char *address_string; + + /** + * Timeout for this set of probes + */ + struct GNUNET_TIME_Absolute timeout; + + /** + * Current index (which port to send on next basically) + */ + int index; + + /** + * The plugin this probe belongs to + */ + struct Plugin *plugin; + + /** + * The task used to send these probes + */ + GNUNET_SCHEDULER_TaskIdentifier task; + + /** + * Network address (always ipv4) + */ + struct sockaddr_in sock_addr; + +}; + + +/** + * Encapsulation of all of the state of the plugin. + */ +struct Plugin +{ + /** + * Our environment. + */ + struct GNUNET_TRANSPORT_PluginEnvironment *env; + + /** + * Handle for the statistics service. + */ + struct GNUNET_STATISTICS_Handle *statistics; + + /** + * Handle to the network service. + */ + struct GNUNET_SERVICE_Context *service; + + /* + * Session of peers with whom we are currently connected + */ + struct PeerSession *sessions; + + /** + * Handle for request of hostname resolution, non-NULL if pending. + */ + struct GNUNET_RESOLVER_RequestHandle *hostname_dns; + + /** + * ID of task used to update our addresses when one expires. + */ + GNUNET_SCHEDULER_TaskIdentifier address_update_task; + + /** + * ID of select task + */ + GNUNET_SCHEDULER_TaskIdentifier select_task; + + /** + * Starting port, will listen on num_ports (if available) starting + * at this number + */ + uint16_t starting_port; + + /** + * How many ports should we be using? + */ + uint16_t num_ports; + + /* + * The external address given to us by the user. Must be actual + * outside visible address for NAT punching to work. + */ + char *external_address; + + /* + * FD Read set + */ + struct GNUNET_NETWORK_FDSet *rs; + + /* + * stdout pipe handle for the gnunet-nat-server process + */ + struct GNUNET_DISK_PipeHandle *server_stdout; + + /* + * stdout file handle (for reading) for the gnunet-nat-server process + */ + const struct GNUNET_DISK_FileHandle *server_stdout_handle; + + /** + * ID of select gnunet-nat-server stdout read task + */ + GNUNET_SCHEDULER_TaskIdentifier server_read_task; + + /** + * Is this transport configured to be behind a NAT? + */ + int behind_nat; + + /** + * The process id of the server process (if behind NAT) + */ + pid_t server_pid; + + /** + * Probes in flight + */ + struct UDP_NAT_Probes *probes; + +}; + +/* *********** globals ************* */ + +/** + * the socket that we transmit all data with + */ +static struct GNUNET_NETWORK_Handle *udp_nat_socks[UDP_NAT_LISTEN_PORTS]; + + +/** + * Forward declaration. + */ +void +udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result); + + +/** + * Disconnect from a remote node. + * + * @param tsession the session that is closed + * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed + */ +void +udp_nat_disconnect (void *cls, const struct GNUNET_PeerIdentity *target) +{ + return; +} + +/** + * Shutdown the server process (stop receiving inbound traffic). Maybe + * restarted later! + */ +static int +udp_nat_transport_server_stop (void *cls) +{ + struct Plugin *plugin = cls; + int ret; + int ok; + int i; + + if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK) + { + GNUNET_SCHEDULER_cancel (plugin->env->sched, plugin->select_task); + plugin->select_task = GNUNET_SCHEDULER_NO_TASK; + } + + for (i = 0; i < plugin->num_ports; i++) + { + ok = GNUNET_NETWORK_socket_close (udp_nat_socks[i]); + if (ok == GNUNET_OK) + udp_nat_socks[i] = NULL; + ret += ok; + } + + if (plugin->behind_nat == GNUNET_YES) + { + if (0 != PLIBC_KILL (plugin->server_pid, SIGTERM)) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill"); + } + GNUNET_OS_process_wait (plugin->server_pid); + } + + if (ret != GNUNET_OK) + return GNUNET_SYSERR; + return ret; +} + + +struct PeerSession * +find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer) +{ + struct PeerSession *pos; + + pos = plugin->sessions; + while (pos != NULL) + { + if (memcmp(&pos->target, peer, sizeof(struct GNUNET_PeerIdentity)) == 0) + return pos; + pos = pos->next; + } + + return pos; +} + + +/** + * Actually send out the message, assume we've got the address and + * send_handle squared away! + * + * @param cls closure + * @param send_handle which handle to send message on + * @param target who should receive this message (ignored by UDP) + * @param msgbuf one or more GNUNET_MessageHeader(s) strung together + * @param msgbufsize the size of the msgbuf to send + * @param priority how important is the message (ignored by UDP) + * @param timeout when should we time out (give up) if we can not transmit? + * @param addr the addr to send the message to, needs to be a sockaddr for us + * @param addrlen the len of addr + * @param cont continuation to call once the message has + * been transmitted (or if the transport is ready + * for the next transmission call; or if the + * peer disconnected...) + * @param cont_cls closure for cont + * + * @return the number of bytes written + * + */ +static ssize_t +udp_nat_real_send (void *cls, + struct GNUNET_NETWORK_Handle *send_handle, + const struct GNUNET_PeerIdentity *target, + const char *msgbuf, + size_t msgbuf_size, + unsigned int priority, + struct GNUNET_TIME_Relative timeout, + const void *addr, + size_t addrlen, + GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls) +{ + struct Plugin *plugin = cls; + struct UDPMessage *message; + int ssize; + ssize_t sent; + + if ((addr == NULL) || (addrlen == 0)) + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _ + ("udp_nat_plugin_send called without address, returning!\n")); +#endif + cont (cont_cls, target, GNUNET_SYSERR); + return 0; /* Can never send if we don't have an address!! */ + } + + /* Build the message to be sent */ + message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size); + ssize = sizeof (struct UDPMessage) + msgbuf_size; + +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _ + ("In udp_nat_send, ssize is %d, sending message to %s\n"), ssize, GNUNET_a2s((const struct sockaddr *)addr, addrlen)); +#endif + message->header.size = htons (ssize); + message->header.type = htons (0); + memcpy (&message->sender, plugin->env->my_identity, + sizeof (struct GNUNET_PeerIdentity)); + memcpy (&message[1], msgbuf, msgbuf_size); + + /* Actually send the message */ + sent = + GNUNET_NETWORK_socket_sendto (send_handle, message, ssize, + addr, + addrlen); + + if (cont != NULL) + { + if (sent == GNUNET_SYSERR) + cont (cont_cls, target, GNUNET_SYSERR); + else + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _ + ("Successfully sent message, calling transmit continuation!\n")); +#endif + cont (cont_cls, target, GNUNET_OK); + } + } + GNUNET_free (message); + return sent; +} + +/** + * We learned about a peer (possibly behind NAT) so run the + * gnunet-nat-client to send a dummy ICMP response + * + * @param plugin the plugin for this transport + * @param addr the address of the peer + * @param addrlen the length of the address + */ +void +run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen) +{ + char inet4[INET_ADDRSTRLEN]; + char *address_as_string; + pid_t pid; + const struct sockaddr *sa = (const struct sockaddr *)addr; + + if (addrlen < sizeof (struct sockaddr)) + return; + switch (sa->sa_family) + { + case AF_INET: + if (addrlen != sizeof (struct sockaddr_in)) + return; + inet_ntop (AF_INET, + &((struct sockaddr_in *) sa)->sin_addr, + inet4, INET_ADDRSTRLEN); + address_as_string = GNUNET_strdup (inet4); + break; + case AF_INET6: + default: + return; + } + +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Running gnunet-nat-client with address %s\n"), address_as_string); +#endif + /* Start the server process */ + pid = GNUNET_OS_start_process(NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, NULL); + GNUNET_OS_process_wait (pid); +} + +/** + * Function that can be used by the transport service to transmit + * a message using the plugin. + * + * @param cls closure + * @param target who should receive this message (ignored by UDP) + * @param msgbuf one or more GNUNET_MessageHeader(s) strung together + * @param msgbufsize the size of the msgbuf to send + * @param priority how important is the message (ignored by UDP) + * @param timeout when should we time out (give up) if we can not transmit? + * @param addr the addr to send the message to, needs to be a sockaddr for us + * @param addrlen the len of addr + * @param force_address not used, we had better have an address to send to + * because we are stateless!! + * @param cont continuation to call once the message has + * been transmitted (or if the transport is ready + * for the next transmission call; or if the + * peer disconnected...) + * @param cont_cls closure for cont + * + * @return the number of bytes written + */ +static ssize_t +udp_nat_plugin_send (void *cls, + const struct GNUNET_PeerIdentity *target, + const char *msgbuf, + size_t msgbuf_size, + unsigned int priority, + struct GNUNET_TIME_Relative timeout, + const void *addr, + size_t addrlen, + int force_address, + GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls) +{ + struct Plugin *plugin = cls; + ssize_t sent; + struct MessageQueue *temp_message; + struct PeerSession *peer_session; + + /** + * FIXME: find which sock in udp_nat_socks to actually send the message on, + * also this means creating some sort of structure to remember target to + * udp sock (or address, or index of udp sock array...) + */ + sent = 0; + if (plugin->behind_nat == GNUNET_NO) + { + peer_session = find_session(plugin, target); + if (peer_session == NULL) /* We have a new peer to add */ + { + /* + * The first time, we can assume we have no knowledge of a + * working port for this peer, call the ICMP message sender + * and wait... + */ + peer_session = GNUNET_malloc(sizeof(struct PeerSession)); + peer_session->connect_addr = GNUNET_malloc(addrlen); + memcpy(peer_session->connect_addr, addr, addrlen); + peer_session->connect_alen = addrlen; + peer_session->plugin = plugin; + peer_session->sock = NULL; + memcpy(&peer_session->target, target, sizeof(struct GNUNET_PeerIdentity)); + peer_session->expecting_welcome = GNUNET_YES; + + peer_session->next = plugin->sessions; + plugin->sessions = peer_session; + + peer_session->messages = GNUNET_malloc(sizeof(struct MessageQueue)); + peer_session->messages->msgbuf = GNUNET_malloc(msgbuf_size); + memcpy(peer_session->messages->msgbuf, msgbuf, msgbuf_size); + peer_session->messages->msgbuf_size = msgbuf_size; + peer_session->messages->next = NULL; + peer_session->messages->timeout = GNUNET_TIME_relative_to_absolute(timeout); + peer_session->messages->cont = cont; + peer_session->messages->cont_cls = cont_cls; +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Set up peer session for peer %s\n"), GNUNET_i2s(target)); +#endif + run_gnunet_nat_client(plugin, addr, addrlen); + + } + else + { + if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */ + { + sent = udp_nat_real_send(cls, peer_session->sock, target, msgbuf, msgbuf_size, priority, timeout, peer_session->connect_addr, peer_session->connect_alen, cont, cont_cls); + } + else /* Haven't gotten a response from this peer, queue message */ + { + temp_message = GNUNET_malloc(sizeof(struct MessageQueue)); + temp_message->msgbuf = GNUNET_malloc(msgbuf_size); + memcpy(temp_message->msgbuf, msgbuf, msgbuf_size); + temp_message->msgbuf_size = msgbuf_size; + temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout); + temp_message->cont = cont; + temp_message->cont_cls = cont_cls; + temp_message->next = peer_session->messages; + peer_session->messages = temp_message; + } + } + } + else /* We are behind a NAT, so we can just send the message as is */ + { + sent = udp_nat_real_send(cls, udp_nat_socks[0], target, msgbuf, msgbuf_size, priority, timeout, addr, addrlen, cont, cont_cls); + } + + return sent; +} + + +/** + * Add the IP of our network interface to the list of + * our external IP addresses. + */ +static int +process_interfaces (void *cls, + const char *name, + int isDefault, + const struct sockaddr *addr, socklen_t addrlen) +{ + struct Plugin *plugin = cls; + int af; + struct sockaddr_in *v4; + struct sockaddr_in6 *v6; + + /* + * FIXME: Do we want to advertise _all_ of our UDP NAT addresses? + * Probably not. Can we assume that we'll only send these out of band? + * Ostensibly we won't accept just any connection on these ports anyways + * right? + */ + + af = addr->sa_family; + if (af == AF_INET) + { + v4 = (struct sockaddr_in *) addr; + v4->sin_port = htons (plugin->starting_port); + } + else + { + GNUNET_assert (af == AF_INET6); + v6 = (struct sockaddr_in6 *) addr; + v6->sin6_port = htons (plugin->starting_port); + } + +#if !IPV6 + if (af == AF_INET) + { +#endif + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO | + GNUNET_ERROR_TYPE_BULK, + "udp-nat", _("Found address `%s' (%s)\n"), + GNUNET_a2s (addr, addrlen), name); + plugin->env->notify_address (plugin->env->cls, + "udp_nat", + addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL); +#if !IPV6 + } +#endif + + return GNUNET_OK; +} + + +/** + * Function called by the resolver for each address obtained from DNS + * for our own hostname. Add the addresses to the list of our + * external IP addresses. + * + * @param cls closure + * @param addr one of the addresses of the host, NULL for the last address + * @param addrlen length of the address + */ +static void +process_hostname_ips (void *cls, + const struct sockaddr *addr, socklen_t addrlen) +{ + struct Plugin *plugin = cls; + + if (addr == NULL) + { + plugin->hostname_dns = NULL; + return; + } + process_interfaces (plugin, "", GNUNET_YES, addr, addrlen); +} + + +/** + * Send UDP probe messages or UDP keepalive messages, depending on the + * state of the connection. + * + * @param cls closure for this call (should be the main Plugin) + * @param tc task context for running this + */ +static void +send_udp_probe_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct UDP_NAT_Probes *probe = cls; + struct UDP_NAT_ProbeMessage *message; + struct Plugin *plugin = probe->plugin; + int sent; + + message = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessage)); + message->header.size = htons(sizeof(struct UDP_NAT_ProbeMessage)); + message->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE); + //message->port = htons(probe->index + plugin->starting_port); + probe->sock_addr.sin_port = htons(probe->index + plugin->starting_port); +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Sending a probe on port %d\n"), ntohs(probe->sock_addr.sin_port)); +#endif +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _ + ("about to send probe, ssize is %d, sending message to %s\n"), ntohs(message->header.size), GNUNET_a2s((const struct sockaddr *)&probe->sock_addr, sizeof(probe->sock_addr))); +#endif + sent = udp_nat_real_send(plugin, udp_nat_socks[probe->index], NULL, (char *)message, ntohs(message->header.size), 0, GNUNET_TIME_relative_get_unit(), &probe->sock_addr, sizeof(probe->sock_addr), &udp_probe_continuation, probe); + + if (probe->index + 1 < plugin->num_ports) + probe->index += 1; + else + probe->index = 0; + +} + + +void +dummy_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result) +{ + return; +} + + +/** + * Continuation for probe sends. If the last probe was sent + * "successfully", schedule sending of another one. If not, + * + */ +void +udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result) +{ + struct UDP_NAT_Probes *probe = cls; + struct Plugin *plugin = probe->plugin; + + if (result == GNUNET_OK) + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Successfully sent a probe\n")); +#endif + if (probe->index == 0) + probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 5000), &send_udp_probe_message, probe); + else + probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 500), &send_udp_probe_message, probe); + } + else /* Destroy the probe context? */ + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Sending probe didn't go well...\n")); +#endif + + } +} + +/** + * Find probe message by address + * + * @param plugin the plugin for this transport + * @param address_string the ip address as a string + */ +struct UDP_NAT_Probes * +find_probe(struct Plugin *plugin, char * address_string) +{ + struct UDP_NAT_Probes *pos; + + pos = plugin->probes; + while (pos != NULL) + if (strcmp(pos->address_string, address_string) == 0) + return pos; + + return pos; +} + + +/* + * @param cls the plugin handle + * @param tc the scheduling context (for rescheduling this function again) + * + * We have been notified that gnunet-nat-server has written something to stdout. + * Handle the output, then reschedule this function to be called again once + * more is available. + * + */ +static void +udp_nat_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct Plugin *plugin = cls; + char mybuf[40]; + ssize_t bytes; + memset(&mybuf, 0, sizeof(mybuf)); + int i; + struct UDP_NAT_Probes *temp_probe; + + bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf)); + + if (bytes < 1) + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Finished reading from server stdout with code: %d\n"), bytes); +#endif + return; + } + + for (i = 0; i < sizeof(mybuf); i++) + { + if (mybuf[i] == '\n') + mybuf[i] = '\0'; + } + +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("nat-server-read read: %s\n"), &mybuf); +#endif + + /* Schedule sending of messages to peer on each open port */ + temp_probe = find_probe(plugin, &mybuf[0]); + + if (temp_probe == NULL) + { + temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes)); + temp_probe->address_string = strdup(&mybuf[0]); + temp_probe->sock_addr.sin_family = AF_INET; + GNUNET_assert(inet_pton(AF_INET, &mybuf[0], &temp_probe->sock_addr.sin_addr) == 1); + temp_probe->index = 0; + temp_probe->next = plugin->probes; + temp_probe->plugin = plugin; + 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); + plugin->probes = temp_probe; + } + + plugin->server_read_task = + GNUNET_SCHEDULER_add_read_file (plugin->env->sched, + GNUNET_TIME_UNIT_FOREVER_REL, + plugin->server_stdout_handle, &udp_nat_plugin_server_read, plugin); + +} + + +/** + * Demultiplexer for UDP NAT messages + * + * @param plugin the main plugin for this transport + * + */ +static void +udp_nat_demultiplexer(struct Plugin *plugin, struct GNUNET_PeerIdentity *sender, const struct GNUNET_MessageHeader *currhdr, struct sockaddr_storage *sender_addr, socklen_t fromlen, int receiving_port) +{ + struct UDP_NAT_ProbeMessageReply *outgoing_probe_reply; + struct UDP_NAT_ProbeMessageConfirmation *outgoing_probe_confirmation; + + struct UDP_NAT_ProbeMessage *incoming_probe; + struct UDP_NAT_ProbeMessageReply *incoming_probe_reply; + struct UDP_NAT_ProbeMessageConfirmation *incoming_probe_confirmation; + char addr_buf[INET_ADDRSTRLEN]; + struct UDP_NAT_Probes *outgoing_probe; + struct PeerSession *peer_session; + struct MessageQueue *pending_message; + struct MessageQueue *pending_message_temp; + int sent; + + switch (ntohs(currhdr->type)) + { + case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE: + /* Send probe reply */ + incoming_probe = (struct UDP_NAT_ProbeMessage *)currhdr; + outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply)); + outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply)); + outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY); + +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Received a probe from port %d, sent_from port %d\n"), receiving_port, ((struct sockaddr_in *)sender_addr)->sin_port); +#endif + + sent = udp_nat_real_send(plugin, udp_nat_socks[0], NULL, (char *)outgoing_probe_reply, ntohs(outgoing_probe_reply->header.size), 0, GNUNET_TIME_relative_get_unit(), sender_addr, fromlen, &dummy_continuation, NULL); +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Sent %d byes of PROBE REPLY\n"), sent); +#endif + + break; + case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY: + /* Check for existing probe, check ports returned, send confirmation if all is well */ + incoming_probe_reply = (struct UDP_NAT_ProbeMessageReply *)currhdr; +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat", + _("Received a probe reply with ss_family %d!\n"), sender_addr->ss_family); +#endif + /* FIXME: use nonce, then IPv6 replies could work I think... */ + if (sender_addr->ss_family == AF_INET) + { + memset(&addr_buf, 0, sizeof(addr_buf)); + inet_ntop(AF_INET, &((struct sockaddr_in *) sender_addr)->sin_addr, addr_buf, INET_ADDRSTRLEN); + outgoing_probe = find_probe(plugin, &addr_buf[0]); + if (outgoing_probe != NULL) + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Sending confirmation that were were reached!\n")); +#endif + outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation)); + outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation)); + outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM); + sent = udp_nat_real_send(plugin, udp_nat_socks[receiving_port - plugin->starting_port], NULL, (char *)outgoing_probe_confirmation, ntohs(outgoing_probe_confirmation->header.size), 0, GNUNET_TIME_relative_get_unit(), sender_addr, fromlen, &dummy_continuation, NULL); + if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK) + { + GNUNET_SCHEDULER_cancel(plugin->env->sched, outgoing_probe->task); + outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK; + /* Schedule task to timeout and remove probe if confirmation not received */ + } + } + else + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat", + _("Received a probe reply, but have no record of a sent probe!\n")); +#endif + } + } + break; + case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM: + incoming_probe_confirmation = (struct UDP_NAT_ProbeMessageConfirmation *)currhdr; + peer_session = find_session(plugin, sender); +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", + _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender)); +#endif + if (peer_session == NULL) /* Shouldn't this NOT happen? */ + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat", + _("Received a probe confirmation, but don't remember this peer!\n")); +#endif + } + else if (peer_session->expecting_welcome == GNUNET_YES) + { + peer_session->expecting_welcome = GNUNET_NO; + peer_session->sock = udp_nat_socks[receiving_port - plugin->starting_port]; /* This may matter, not sure right now... */ + ((struct sockaddr_in *)peer_session->connect_addr)->sin_port = ((struct sockaddr_in *) sender_addr)->sin_port; +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat", + _("Received a probe confirmation, will send to peer on port %d\n"), ntohs(((struct sockaddr_in *)peer_session->connect_addr)->sin_port)); +#endif + if (peer_session->messages != NULL) + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat", + _("Received a probe confirmation, sending queued messages.\n")); +#endif + pending_message = peer_session->messages; + while (pending_message != NULL) + { + udp_nat_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, &dummy_continuation, NULL); + pending_message_temp = pending_message; + pending_message = pending_message->next; + GNUNET_free(pending_message_temp->msgbuf); + GNUNET_free(pending_message_temp); + } + } + + } + else + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat", + _("Received probe confirmation for already confirmed peer!\n")); +#endif + } + /* Received confirmation, add peer with address/port specified */ + break; + case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE: + /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */ + /* If we receive these just ignore! */ + break; + default: + plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE, (char *)sender_addr, fromlen); + } + +} + + +/* + * @param cls the plugin handle + * @param tc the scheduling context (for rescheduling this function again) + * + * We have been notified that our writeset has something to read. We don't + * know which socket needs to be read, so we have to check each one + * Then reschedule this function to be called again once more is available. + * + */ +static void +udp_nat_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct Plugin *plugin = cls; + char *buf; + struct UDPMessage *msg; + const struct GNUNET_MessageHeader *hdr; + struct GNUNET_PeerIdentity *sender; + unsigned int buflen; + socklen_t fromlen; + struct sockaddr_storage addr; + ssize_t ret; + int offset; + int count; + int tsize; + int i; + char *msgbuf; + const struct GNUNET_MessageHeader *currhdr; + + buf = NULL; + sender = NULL; + + for (i = 0; i < plugin->num_ports; i++) + { + buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_nat_socks[i]); + + if (buflen == GNUNET_NO) + break; + + buf = GNUNET_malloc (buflen); + fromlen = sizeof (addr); + memset (&addr, 0, fromlen); + ret = + GNUNET_NETWORK_socket_recvfrom (udp_nat_socks[i], buf, buflen, + (struct sockaddr *) &addr, &fromlen); + +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat", _ + ("socket_recv returned %u, src_addr_len is %u\n"), ret, + fromlen); +#endif + + if (ret <= 0) + { + GNUNET_free (buf); + break; + } + msg = (struct UDPMessage *) buf; + +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _ + ("header reports message size of %d, type %d\n"), + ntohs (msg->header.size), ntohs (msg->header.type)); +#endif + if (ntohs (msg->header.size) < sizeof (struct UDPMessage)) + { + GNUNET_free (buf); + break; + } + hdr = (const struct GNUNET_MessageHeader *) &msg[1]; + msgbuf = (char *)&msg[1]; + sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity)); + memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity)); + + offset = 0; + count = 0; + tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage); + + while (offset < tsize) + { + currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset]; +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _ + ("processing msg %d: type %d, size %d at offset %d\n"), + count, ntohs(currhdr->type), ntohs(currhdr->size), offset); +#endif + udp_nat_demultiplexer(plugin, sender, currhdr, &addr, fromlen, plugin->starting_port + i); + + offset += ntohs(currhdr->size); + count++; + } + } + + GNUNET_free_non_null (sender); + GNUNET_free_non_null (buf); + + plugin->select_task = + GNUNET_SCHEDULER_add_select (plugin->env->sched, + GNUNET_SCHEDULER_PRIORITY_DEFAULT, + GNUNET_SCHEDULER_NO_TASK, + GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs, + NULL, &udp_nat_plugin_select, plugin); + +} + +/** + * Create a slew of UDP sockets. If possible, use IPv6, otherwise + * try IPv4. + * + * @param cls closure for server start, should be a struct Plugin * + * + * @return number of sockets created or GNUNET_SYSERR on error + */ +static int +udp_nat_transport_server_start (void *cls) +{ + struct Plugin *plugin = cls; + struct sockaddr_in serverAddrv4; +#if IPV6 + struct sockaddr_in6 serverAddrv6; +#endif + struct sockaddr *serverAddr; + socklen_t addrlen; + int i; + int sockets_created; + + /* Pipe to read from started processes stdout (on read end) */ + plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES); + + sockets_created = 0; + if (plugin->server_stdout == NULL) + return sockets_created; + + if (plugin->behind_nat == GNUNET_YES) + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, + "udp_nat", + "Starting gnunet-nat-server process\n"); +#endif + /* Start the server process */ + plugin->server_pid = GNUNET_OS_start_process(NULL, plugin->server_stdout, "gnunet-nat-server", "gnunet-nat-server", plugin->external_address, NULL); + if (plugin->server_pid == GNUNET_SYSERR) + return GNUNET_SYSERR; + /* Close the write end of the read pipe */ + GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE); + + plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ); + plugin->server_read_task = + GNUNET_SCHEDULER_add_read_file (plugin->env->sched, + GNUNET_TIME_UNIT_FOREVER_REL, + plugin->server_stdout_handle, &udp_nat_plugin_server_read, plugin); + } + + /* Open all our sockets for reading/writing */ + for (i = 0; i < plugin->num_ports; i++) + { + udp_nat_socks[i] = NULL; +#if IPV6 + if (GNUNET_YES != + GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD", + "DISABLE-IPV6")) + { + udp_nat_socks[i] = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17); + if (udp_nat_socks[i] != NULL) + { + memset (&serverAddrv6, 0, sizeof (serverAddrv6)); + #if HAVE_SOCKADDR_IN_SIN_LEN + serverAddrv6.sin6_len = sizeof (serverAddrv6); + #endif + serverAddrv6.sin6_family = AF_INET6; + serverAddrv6.sin6_addr = in6addr_any; + serverAddrv6.sin6_port = htons (i + plugin->starting_port); + addrlen = sizeof (serverAddrv6); + serverAddr = (struct sockaddr *) &serverAddrv6; + } + } +#endif + if (NULL == udp_nat_socks[i]) + { + udp_nat_socks[i] = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17); + if (NULL == udp_nat_socks[i]) + { + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", "socket"); + return sockets_created; + } + else + { + memset (&serverAddrv4, 0, sizeof (serverAddrv4)); + #if HAVE_SOCKADDR_IN_SIN_LEN + serverAddrv4.sin_len = sizeof (serverAddrv4); + #endif + serverAddrv4.sin_family = AF_INET; + serverAddrv4.sin_addr.s_addr = INADDR_ANY; + if (i == 0) + serverAddrv4.sin_port = htons (plugin->starting_port); + else + serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 64537) + 1000); /* Find a non-root port */ + addrlen = sizeof (serverAddrv4); + serverAddr = (struct sockaddr *) &serverAddrv4; + } + } + + if (udp_nat_socks[i] != NULL) + { +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, + "udp_nat", + "Binding to port %d\n", ntohs(serverAddrv4.sin_port)); +#endif + while (GNUNET_NETWORK_socket_bind (udp_nat_socks[i], serverAddr, addrlen) != + GNUNET_OK) + { + serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 64537) + 1000); /* Find a non-root port */ +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, + "udp_nat", + "Binding failed, trying new port %d\n", ntohs(serverAddrv4.sin_port)); +#endif + } + sockets_created++; + } + } + + plugin->rs = GNUNET_NETWORK_fdset_create (); + + GNUNET_NETWORK_fdset_zero (plugin->rs); + + for (i = 0; i < plugin->num_ports; i++) + { + GNUNET_NETWORK_fdset_set (plugin->rs, udp_nat_socks[i]); + } + + plugin->select_task = + GNUNET_SCHEDULER_add_select (plugin->env->sched, + GNUNET_SCHEDULER_PRIORITY_DEFAULT, + GNUNET_SCHEDULER_NO_TASK, + GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs, + NULL, &udp_nat_plugin_select, plugin); + + return sockets_created; +} + + +/** + * Check if the given port is plausible (must be either + * our listen port or our advertised port). If it is + * neither, we return one of these two ports at random. + * + * @return either in_port or a more plausible port + */ +static uint16_t +check_port (struct Plugin *plugin, uint16_t in_port) +{ + int i; + + for (i = plugin->starting_port; i < plugin->num_ports + plugin->starting_port; i++) + { + if (in_port == i) + return in_port; + } + + return GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, + plugin->num_ports) + plugin->starting_port; +} + + +/** + * Another peer has suggested an address for this peer and transport + * plugin. Check that this could be a valid address. This function + * is not expected to 'validate' the address in the sense of trying to + * connect to it but simply to see if the binary format is technically + * legal for establishing a connection. + * + * @param addr pointer to the address, may be modified (slightly) + * @param addrlen length of addr + * @return GNUNET_OK if this is a plausible address for this peer + * and transport, GNUNET_SYSERR if not + * + * TODO: perhaps make everything work with sockaddr_storage, it may + * be a cleaner way to handle addresses in UDP + */ +static int +udp_nat_check_address (void *cls, void *addr, size_t addrlen) +{ + struct Plugin *plugin = cls; + char buf[sizeof (struct sockaddr_in6)]; + + struct sockaddr_in *v4; + struct sockaddr_in6 *v6; + +#if IPV6 + if ((addrlen != sizeof (struct sockaddr_in)) && + (addrlen != sizeof (struct sockaddr_in6))) +#else + if (addrlen != sizeof (struct sockaddr_in)) +#endif + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + memcpy (buf, addr, sizeof (struct sockaddr_in6)); + if (addrlen == sizeof (struct sockaddr_in)) + { + v4 = (struct sockaddr_in *) buf; + v4->sin_port = htons (check_port (plugin, ntohs (v4->sin_port))); + } + else + { + v6 = (struct sockaddr_in6 *) buf; + v6->sin6_port = htons (check_port (plugin, ntohs (v6->sin6_port))); + } +#if DEBUG_UDP_NAT + GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, + "udp_nat", + "Informing transport service about my address `%s'.\n", + GNUNET_a2s (addr, addrlen)); +#endif + return GNUNET_OK; +} + + +/** + * Append our port and forward the result. + */ +static void +append_port (void *cls, const char *hostname) +{ + struct PrettyPrinterContext *ppc = cls; + char *ret; + + if (hostname == NULL) + { + ppc->asc (ppc->asc_cls, NULL); + GNUNET_free (ppc); + return; + } + GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port); + ppc->asc (ppc->asc_cls, ret); + GNUNET_free (ret); +} + + +/** + * Convert the transports address to a nice, human-readable + * format. + * + * @param cls closure + * @param type name of the transport that generated the address + * @param addr one of the addresses of the host, NULL for the last address + * the specific address format depends on the transport + * @param addrlen length of the address + * @param numeric should (IP) addresses be displayed in numeric form? + * @param timeout after how long should we give up? + * @param asc function to call on each string + * @param asc_cls closure for asc + */ +static void +udp_nat_plugin_address_pretty_printer (void *cls, + const char *type, + const void *addr, + size_t addrlen, + int numeric, + struct GNUNET_TIME_Relative timeout, + GNUNET_TRANSPORT_AddressStringCallback asc, + void *asc_cls) +{ + struct Plugin *plugin = cls; + const struct sockaddr_in *v4; + const struct sockaddr_in6 *v6; + struct PrettyPrinterContext *ppc; + + if ((addrlen != sizeof (struct sockaddr_in)) && + (addrlen != sizeof (struct sockaddr_in6))) + { + /* invalid address */ + GNUNET_break_op (0); + asc (asc_cls, NULL); + return; + } + ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext)); + ppc->asc = asc; + ppc->asc_cls = asc_cls; + if (addrlen == sizeof (struct sockaddr_in)) + { + v4 = (const struct sockaddr_in *) addr; + ppc->port = ntohs (v4->sin_port); + } + else + { + v6 = (const struct sockaddr_in6 *) addr; + ppc->port = ntohs (v6->sin6_port); + + } + GNUNET_RESOLVER_hostname_get (plugin->env->sched, + plugin->env->cfg, + addr, + addrlen, + !numeric, timeout, &append_port, ppc); +} + +/** + * Set a quota for receiving data from the given peer; this is a + * per-transport limit. This call has no meaning for UDP, as if + * we don't receive data it still comes in. UDP has no friendliness + * guarantees, and our buffers will fill at some level. + * + * @param cls closure + * @param target the peer for whom the quota is given + * @param quota_in quota for receiving/sending data in bytes per ms + */ +static void +udp_nat_plugin_set_receive_quota (void *cls, + const struct GNUNET_PeerIdentity *target, + uint32_t quota_in) +{ + return; /* Do nothing */ +} + +/** + * The exported method. Makes the core api available via a global and + * returns the udp transport API. + */ +void * +libgnunet_plugin_transport_udp_nat_init (void *cls) +{ + unsigned long long mtu; + + struct GNUNET_TRANSPORT_PluginEnvironment *env = cls; + struct GNUNET_TRANSPORT_PluginFunctions *api; + struct Plugin *plugin; + struct GNUNET_SERVICE_Context *service; + int sockets_created; + int behind_nat; + + char *external_address; + char *starting_port; + + service = GNUNET_SERVICE_start ("transport-udp-nat", env->sched, env->cfg); + if (service == NULL) + { + GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp_nat", _ + ("Failed to start service for `%s' transport plugin.\n"), + "udp-nat"); + return NULL; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_string (env->cfg, + "transport-udp-nat", + "EXTERNAL_ADDRESS", + &external_address)) + { + GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, + "udp_nat", + _ + ("Require EXTERNAL_ADDRESS for service `%s' in configuration!\n"), + "transport-udp"); + GNUNET_SERVICE_stop (service); + } + + if (GNUNET_NO == GNUNET_CONFIGURATION_get_value_yesno (env->cfg, + "transport-udp-nat", + "BEHIND_NAT")) + behind_nat = GNUNET_NO; /* We are not behind nat, or so says the user! */ + else + behind_nat = GNUNET_YES; /* Assume we are behind nat (default) */ + + GNUNET_CONFIGURATION_get_value_string (env->cfg, + "transport-udp-nat", + "STARTING_PORT", + &starting_port); + + mtu = 1240; + if (mtu < 1200) + GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, + "udp_nat", + _("MTU %llu for `%s' is probably too low!\n"), mtu, + "UDP"); + + plugin = GNUNET_malloc (sizeof (struct Plugin)); + plugin->external_address = external_address; + if (starting_port != NULL) + plugin->starting_port = atoi(starting_port); + else + plugin->starting_port = UDP_NAT_STARTING_PORT; + plugin->behind_nat = behind_nat; + if (plugin->behind_nat == GNUNET_NO) + plugin->num_ports = 1; /* Only use one port/socket */ + else + plugin->num_ports = UDP_NAT_LISTEN_PORTS; + + plugin->env = env; + plugin->statistics = NULL; + api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions)); + api->cls = plugin; + + api->send = &udp_nat_plugin_send; + api->disconnect = &udp_nat_disconnect; + api->address_pretty_printer = &udp_nat_plugin_address_pretty_printer; + api->set_receive_quota = &udp_nat_plugin_set_receive_quota; + api->check_address = &udp_nat_check_address; + + plugin->service = service; + + /* FIXME: do the two calls below periodically again and + not just once (since the info we get might change...) */ + GNUNET_OS_network_interfaces_list (&process_interfaces, plugin); + plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched, + env->cfg, + AF_UNSPEC, + HOSTNAME_RESOLVE_TIMEOUT, + &process_hostname_ips, + plugin); + + sockets_created = udp_nat_transport_server_start (plugin); + + GNUNET_assert (sockets_created == plugin->num_ports); + + return api; +} + +void * +libgnunet_plugin_transport_udp_nat_done (void *cls) +{ + struct GNUNET_TRANSPORT_PluginFunctions *api = cls; + struct Plugin *plugin = api->cls; + + udp_nat_transport_server_stop (plugin); + if (NULL != hostname_dns) + { + GNUNET_RESOLVER_request_cancel (hostname_dns); + hostname_dns = NULL; + } + GNUNET_SERVICE_stop (plugin->service); + + GNUNET_NETWORK_fdset_destroy (plugin->rs); + GNUNET_free (plugin); + GNUNET_free (api); + return NULL; +} + +/* end of plugin_transport_udp.c */ diff --git a/src/transport/test_transport_api.c b/src/transport/test_transport_api.c index a43f971a0..2db990e82 100644 --- a/src/transport/test_transport_api.c +++ b/src/transport/test_transport_api.c @@ -19,7 +19,12 @@ */ /** * @file transport/test_transport_api.c - * @brief testcase for transport_api.c + * @brief base test case for transport implementations + * + * This test case serves as a base for tcp, udp, and udp-nat + * transport test cases. Based on the executable being run + * the correct test case will be performed. Conservation of + * C code apparently. */ #include "platform.h" #include "gnunet_common.h" @@ -31,14 +36,12 @@ #include "gnunet_transport_service.h" #include "transport.h" -#define VERBOSE GNUNET_NO +#define VERBOSE GNUNET_YES #define VERBOSE_ARM GNUNET_NO #define START_ARM GNUNET_YES -#define VERBOSE_TRANSPORT GNUNET_NO - /** * How long until we give up on transmitting the message? */ @@ -68,6 +71,8 @@ static int is_tcp; static int is_udp; +static int is_udp_nat; + GNUNET_SCHEDULER_TaskIdentifier die_task; #if VERBOSE @@ -231,7 +236,8 @@ exchange_hello_last (void *cls, GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) message, &me->id)); - GNUNET_TRANSPORT_offer_hello (p1.th, message); + /* Can't we get away with only offering one hello? */ + /* GNUNET_TRANSPORT_offer_hello (p1.th, message); */ /*sleep(1);*/ /* Make sure we are not falling prey to the "favorable timing" bug... */ @@ -264,44 +270,6 @@ exchange_hello (void *cls, GNUNET_TRANSPORT_get_hello (p2.th, &exchange_hello_last, &p2); } -#if WRITECONFIG -static void -setTransportOptions(char * filename) -{ - struct GNUNET_CONFIGURATION_Handle * tempcfg; - - tempcfg = GNUNET_CONFIGURATION_create(); - GNUNET_CONFIGURATION_load (tempcfg, filename); - - unsigned long long curr_port; - GNUNET_CONFIGURATION_get_value_number(tempcfg, "transport", "port", &curr_port); - - if (is_udp) - { - GNUNET_CONFIGURATION_set_value_string(tempcfg, "transport", "plugins", "udp"); - GNUNET_CONFIGURATION_set_value_number(tempcfg, "transport-udp", "PORT", curr_port + 3); - } - else if (is_tcp) - { - GNUNET_CONFIGURATION_set_value_string(tempcfg, "transport", "plugins", "tcp"); - GNUNET_CONFIGURATION_set_value_number(tempcfg, "transport-tcp", "port", curr_port + 3); - } - -#if VERBOSE_TRANSPORT - GNUNET_CONFIGURATION_set_value_string(tempcfg, "transport", "DEBUG", "YES"); - GNUNET_CONFIGURATION_set_value_string(tempcfg, "transport", "PREFIX", "xterm -e xterm -T transport -e gdb --args"); -#else - GNUNET_CONFIGURATION_set_value_string(tempcfg, "transport", "DEBUG", "NO"); - GNUNET_CONFIGURATION_set_value_string(tempcfg, "transport", "PREFIX", ""); -#endif - - GNUNET_CONFIGURATION_write(tempcfg, filename); - - GNUNET_CONFIGURATION_destroy(tempcfg); - return; -} -#endif - static void run (void *cls, struct GNUNET_SCHEDULER_Handle *s, @@ -325,6 +293,14 @@ run (void *cls, setup_peer (&p1, "test_transport_api_tcp_peer1.conf"); setup_peer (&p2, "test_transport_api_tcp_peer2.conf"); } + if (is_udp_nat) + { + setup_peer (&p1, "test_transport_api_udp_nat_peer1.conf"); + setup_peer (&p2, "test_transport_api_udp_nat_peer2.conf"); + } + + GNUNET_assert(p1.th != NULL); + GNUNET_assert(p2.th != NULL); GNUNET_TRANSPORT_get_hello (p1.th, &exchange_hello, &p1); } @@ -366,8 +342,14 @@ main (int argc, char *argv[]) if (strstr(argv[0], "tcp") != NULL) { + is_tcp = GNUNET_YES; } + else if (strstr(argv[0], "udp_nat") != NULL) + { + fprintf(stderr, "this is a udp_nat test!\n"); + is_udp_nat = GNUNET_YES; + } else if (strstr(argv[0], "udp") != NULL) { is_udp = GNUNET_YES; diff --git a/src/transport/test_transport_api_udp_nat_peer1.conf b/src/transport/test_transport_api_udp_nat_peer1.conf new file mode 100644 index 000000000..56978a5d6 --- /dev/null +++ b/src/transport/test_transport_api_udp_nat_peer1.conf @@ -0,0 +1,137 @@ +[transport-udp-nat] +PORT = 12368 +BEHIND_NAT = NO +EXTERNAL_ADDRESS = 127.0.0.1 +STARTING_PORT = 22222 + +[fs] +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-fs +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 2094 +INDEXDB = $SERVICEHOME/idxinfo.lst + +[datastore-sqlite] +FILENAME = $SERVICEHOME/datastore/sqlite.db + +[datastore] +DATABASE = sqlite +BLOOMFILTER = $SERVICEHOME/fs/bloomfilter +QUOTA = 100000000 +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-datastore +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 2093 + +[hostlist] +HTTP-PROXY = +SERVERS = http://gnunet.org:8080/ +OPTIONS = -b +BINARY = gnunet-daemon-hostlist +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +HTTPPORT = 8080 + +[topology] +BINARY = gnunet-daemon-topology +CONFIG = $DEFAULTCONFIG +FRIENDS = $SERVICEHOME/friends +TARGET-CONNECTION-COUNT = 16 +AUTOCONNECT = YES +FRIENDS-ONLY = NO +MINIMUM-FRIENDS = 0 + +[core] +TOTAL_QUOTA_OUT = 3932160 +TOTAL_QUOTA_IN = 3932160 +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-core +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 2092 + +[transport] +PLUGINS = udp_nat +DEBUG = YES +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +NEIGHBOUR_LIMIT = 50 +BINARY = /home/mrwiggles/documents/research/gnunet/gnunet-ng/src/transport/.libs/gnunet-service-transport +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 12365 +#PREFIX = valgrind --track-origins=yes --leak-check=full --log-file=valgrind_udp_peer1.log +PREFIX = xterm -e xterm -T transport -e gdb --args + +[peerinfo] +TRUST = $SERVICEHOME/data/credit/ +HOSTS = $SERVICEHOME/data/hosts/ +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-peerinfo +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 12369 + +[resolver] +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-resolver +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 12364 + +[statistics] +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-statistics +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 12367 + +[arm] +DEFAULTSERVICES = +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-arm +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 12366 + +[transport-tcp] +ALLOW_SHUTDOWN = NO +TIMEOUT = 300000 +PORT = 12368 + +[TESTING] +WEAKRANDOM = YES + +[gnunetd] +HOSTKEY = $SERVICEHOME/.hostkey + +[PATHS] +DEFAULTCONFIG = test_transport_api_udp_nat_peer1.conf +SERVICEHOME = /tmp/test-gnunetd-transport-peer-1/ + diff --git a/src/transport/test_transport_api_udp_nat_peer2.conf b/src/transport/test_transport_api_udp_nat_peer2.conf new file mode 100644 index 000000000..d0dbe9653 --- /dev/null +++ b/src/transport/test_transport_api_udp_nat_peer2.conf @@ -0,0 +1,137 @@ +[transport-udp-nat] +PORT = 22368 +BEHIND_NAT = YES +EXTERNAL_ADDRESS = 127.0.0.1 +STARTING_PORT = 22222 + +[fs] +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-fs +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 2094 +INDEXDB = $SERVICEHOME/idxinfo.lst + +[datastore-sqlite] +FILENAME = $SERVICEHOME/datastore/sqlite.db + +[datastore] +DATABASE = sqlite +BLOOMFILTER = $SERVICEHOME/fs/bloomfilter +QUOTA = 100000000 +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-datastore +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 2093 + +[hostlist] +HTTP-PROXY = +SERVERS = http://gnunet.org:8080/ +OPTIONS = -b +BINARY = gnunet-daemon-hostlist +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +HTTPPORT = 8080 + +[topology] +BINARY = gnunet-daemon-topology +CONFIG = $DEFAULTCONFIG +FRIENDS = $SERVICEHOME/friends +TARGET-CONNECTION-COUNT = 16 +AUTOCONNECT = YES +FRIENDS-ONLY = NO +MINIMUM-FRIENDS = 0 + +[core] +TOTAL_QUOTA_OUT = 3932160 +TOTAL_QUOTA_IN = 3932160 +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-core +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 2092 + +[transport] +PLUGINS = udp_nat +DEBUG = YES +PREFIX = +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +NEIGHBOUR_LIMIT = 50 +BINARY = /home/mrwiggles/documents/research/gnunet/gnunet-ng/src/transport/.libs/gnunet-service-transport +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 22365 +PREFIX = xterm -e xterm -T transport -e gdb --args + +[peerinfo] +TRUST = $SERVICEHOME/data/credit/ +HOSTS = $SERVICEHOME/data/hosts/ +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-peerinfo +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 22369 + +[resolver] +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-resolver +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 22364 + +[statistics] +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-statistics +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 22367 + +[arm] +DEFAULTSERVICES = +ALLOW_SHUTDOWN = YES +ACCEPT_FROM6 = ::1; +ACCEPT_FROM = 127.0.0.1; +BINARY = gnunet-service-arm +CONFIG = $DEFAULTCONFIG +HOME = $SERVICEHOME +HOSTNAME = localhost +PORT = 22366 + +[transport-tcp] +ALLOW_SHUTDOWN = NO +TIMEOUT = 300000 +PORT = 22368 + +[TESTING] +WEAKRANDOM = YES + +[gnunetd] +HOSTKEY = $SERVICEHOME/.hostkey + +[PATHS] +DEFAULTCONFIG = test_transport_api_udp_nat_peer2.conf +SERVICEHOME = /tmp/test-gnunetd-transport-peer-2/ + -- 2.25.1