/* This file is part of GNUnet. Copyright (C) 2015 GNUnet e.V. 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 3 of the License, 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 Affero General Public License for more details. */ /** * @file nat/nat_auto.c * @brief functions for auto-configuration of the network * @author Christian Grothoff * @author Bruno Cabral */ #include "platform.h" #include "gnunet_util_lib.h" #include "gnunet_resolver_service.h" #include "gnunet_nat_lib.h" #include "nat.h" #define LOG(kind,...) GNUNET_log_from (kind, "nat", __VA_ARGS__) /** * How long do we wait for the NAT test to report success? */ #define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15) #define NAT_SERVER_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10) /** * Phases of the auto configuration. */ enum AutoPhase { /** * Initial start value. */ AUTO_INIT = 0, /** * Test our external IP. */ AUTO_EXTERNAL_IP, /** * Test our external IP. */ AUTO_STUN, /** * Test our internal IP. */ AUTO_LOCAL_IP, /** * Test if NAT was punched. */ AUTO_NAT_PUNCHED, /** * Test if UPnP is working. */ AUTO_UPNPC, /** * Test if ICMP server works. */ AUTO_ICMP_SERVER, /** * Test if ICMP client works. */ AUTO_ICMP_CLIENT, /** * Last phase, we're done. */ AUTO_DONE }; /** * Handle to auto-configuration in progress. */ struct GNUNET_NAT_AutoHandle { /** * Handle to the active NAT test. */ struct GNUNET_NAT_Test *tst; /** * Function to call when done. */ GNUNET_NAT_AutoResultCallback fin_cb; /** * Closure for @e fin_cb. */ void *fin_cb_cls; /** * Handle for active 'GNUNET_NAT_mini_get_external_ipv4'-operation. */ struct GNUNET_NAT_ExternalHandle *eh; /** * Current configuration (with updates from previous phases) */ struct GNUNET_CONFIGURATION_Handle *cfg; /** * Original configuration (used to calculate differences) */ struct GNUNET_CONFIGURATION_Handle *initial_cfg; /** * Task identifier for the timeout. */ struct GNUNET_SCHEDULER_Task *task; /** * Message queue to the gnunet-nat-server. */ struct GNUNET_MQ_Handle *mq; /** * Where are we in the test? */ enum AutoPhase phase; /** * Situation of the NAT */ enum GNUNET_NAT_Type type; /** * Do we have IPv6? */ int have_v6; /** * UPnP already set the external ip address ? */ int upnp_set_external_address; /** * Did the external server connected back ? */ int connected_back; /** * Address detected by STUN */ char *stun_ip; unsigned int stun_port; /** * Internal IP is the same as the public one ? */ int internal_ip_is_public; /** * Error code for better debugging and user feedback */ enum GNUNET_NAT_StatusCode ret; }; /** * The listen socket of the service for IPv4 */ static struct GNUNET_NETWORK_Handle *lsock4; /** * The listen task ID for IPv4 */ static struct GNUNET_SCHEDULER_Task *ltask4; /** * The port the test service is running on (default 7895) */ static unsigned long long port = 7895; static char *stun_server = "stun.ekiga.net"; static unsigned int stun_port = 3478; /** * Run the next phase of the auto test. * * @param ah auto test handle */ static void next_phase (struct GNUNET_NAT_AutoHandle *ah); static void process_stun_reply(struct sockaddr_in *answer, struct GNUNET_NAT_AutoHandle *ah) { ah->stun_ip = inet_ntoa(answer->sin_addr); ah->stun_port = ntohs (answer->sin_port); GNUNET_log (GNUNET_ERROR_TYPE_INFO, "External IP is: %s , with port %u\n", ah->stun_ip, ah->stun_port); next_phase (ah); } /** * Function that terminates the test. */ static void stop_stun () { GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Stopping STUN and quitting...\n"); /* Clean task */ if (NULL != ltask4) { GNUNET_SCHEDULER_cancel (ltask4); ltask4 = NULL; } /* Clean socket */ if (NULL != lsock4) { GNUNET_NETWORK_socket_close (lsock4); lsock4 = NULL; } } /** * Activity on our incoming socket. Read data from the * incoming connection. * * @param cls */ static void do_udp_read (void *cls) { struct GNUNET_NAT_AutoHandle *ah = cls; unsigned char reply_buf[1024]; ssize_t rlen; struct sockaddr_in answer; const struct GNUNET_SCHEDULER_TaskContext *tc; tc = GNUNET_SCHEDULER_get_task_context (); if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) && (GNUNET_NETWORK_fdset_isset (tc->read_ready, lsock4))) { rlen = GNUNET_NETWORK_socket_recv (lsock4, reply_buf, sizeof (reply_buf)); //Lets handle the packet memset (&answer, 0, sizeof(struct sockaddr_in)); if (ah->phase == AUTO_NAT_PUNCHED) { //Destroy the connection GNUNET_NETWORK_socket_close (lsock4); GNUNET_log (GNUNET_ERROR_TYPE_INFO, "The external server was able to connect back"); ah->connected_back = GNUNET_YES; next_phase (ah); } else { if (GNUNET_OK == GNUNET_NAT_stun_handle_packet (reply_buf, rlen, &answer)) { //Process the answer process_stun_reply (&answer, ah); } else { next_phase (ah); } } } else { GNUNET_log (GNUNET_ERROR_TYPE_INFO, "TIMEOUT while waiting for an answer\n"); if (ah->phase == AUTO_NAT_PUNCHED) { stop_stun(); } next_phase (ah); } } /** * Create an IPv4 listen socket bound to our port. * * @return NULL on error */ static struct GNUNET_NETWORK_Handle * bind_v4 () { struct GNUNET_NETWORK_Handle *ls; struct sockaddr_in sa4; int eno; memset (&sa4, 0, sizeof (sa4)); sa4.sin_family = AF_INET; sa4.sin_port = htons (port); #if HAVE_SOCKADDR_IN_SIN_LEN sa4.sin_len = sizeof (sa4); #endif ls = GNUNET_NETWORK_socket_create (AF_INET, SOCK_DGRAM, 0); if (NULL == ls) return NULL; if (GNUNET_OK != GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4, sizeof (sa4))) { eno = errno; GNUNET_NETWORK_socket_close (ls); errno = eno; return NULL; } return ls; } static void request_callback (void *cls, enum GNUNET_NAT_StatusCode result) { // struct GNUNET_NAT_AutoHandle *ah = cls; GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Request callback: stop and quit\n"); stop_stun (); // next_phase (ah); FIXME this always will be NULL, as called in test_stun() } /** * Function called by NAT to report the outcome of the nat-test. * Clean up and update GUI. * * @param cls the auto handle * @param success currently always #GNUNET_OK * @param emsg NULL on success, otherwise an error message */ static void result_callback (void *cls, enum GNUNET_NAT_StatusCode ret) { struct GNUNET_NAT_AutoHandle *ah = cls; if (GNUNET_NAT_ERROR_SUCCESS == ret) GNUNET_NAT_test_stop (ah->tst); ah->tst = NULL; ah->ret = ret; GNUNET_log (GNUNET_ERROR_TYPE_INFO, GNUNET_NAT_ERROR_SUCCESS == ret ? _("NAT traversal with ICMP Server succeeded.\n") : _("NAT traversal with ICMP Server failed.\n")); GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "ENABLE_ICMP_SERVER", GNUNET_NAT_ERROR_SUCCESS == ret ? "NO" : "YES"); next_phase (ah); } /** * Main function for the connection reversal test. * * @param cls the `struct GNUNET_NAT_AutoHandle` */ static void reversal_test (void *cls) { struct GNUNET_NAT_AutoHandle *ah = cls; ah->task = NULL; GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Testing connection reversal with ICMP server.\n")); GNUNET_RESOLVER_connect (ah->cfg); ah->tst = GNUNET_NAT_test_start (ah->cfg, GNUNET_YES, 0, 0, TIMEOUT, &result_callback, ah); } /** * Set our external IPv4 address based on the UPnP. * * * @param cls closure with our setup context * @param addr the address, NULL on errors * @param emsg NULL on success, otherwise an error message */ static void set_external_ipv4 (void *cls, const struct in_addr *addr, enum GNUNET_NAT_StatusCode ret) { struct GNUNET_NAT_AutoHandle *ah = cls; char buf[INET_ADDRSTRLEN]; ah->eh = NULL; ah->ret = ret; if (GNUNET_NAT_ERROR_SUCCESS != ret) { next_phase (ah); return; } /* enable 'behind nat' */ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Detected external IP `%s'\n"), inet_ntop (AF_INET, addr, buf, sizeof (buf))); GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "BEHIND_NAT", "YES"); /* set external IP address */ if (NULL == inet_ntop (AF_INET, addr, buf, sizeof (buf))) { GNUNET_break (0); /* actually, this should never happen, as the caller already executed just * this check, but for consistency (eg: future changes in the caller) * we still need to report this error... */ ah->ret = GNUNET_NAT_ERROR_EXTERNAL_IP_ADDRESS_INVALID; next_phase (ah); return; } GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "EXTERNAL_ADDRESS", buf); ah->upnp_set_external_address = GNUNET_YES; next_phase (ah); } /** * Determine our external IPv4 address. * * @param ah auto setup context */ static void test_external_ip (struct GNUNET_NAT_AutoHandle *ah) { if (GNUNET_NAT_ERROR_SUCCESS != ah->ret) next_phase (ah); // FIXME: CPS? /* try to detect external IP */ ah->eh = GNUNET_NAT_mini_get_external_ipv4 (TIMEOUT, &set_external_ipv4, ah); } /** * Determine our external IPv4 address and port using an external STUN server * * @param ah auto setup context */ static void test_stun (struct GNUNET_NAT_AutoHandle *ah) { GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Running STUN test\n"); /* Get port from the configuration */ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (ah->cfg, "transport-udp", "PORT", &port)) { port = 2086; } //Lets create the socket lsock4 = bind_v4 (); if (NULL == lsock4) { GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind"); next_phase(ah); return; } else { //Lets call our function now when it accepts ltask4 = GNUNET_SCHEDULER_add_read_net (NAT_SERVER_TIMEOUT, lsock4, &do_udp_read, ah); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "STUN service listens on port %u\n", (unsigned int) port); if (GNUNET_NO == GNUNET_NAT_stun_make_request (stun_server, stun_port, lsock4, &request_callback, NULL)) { /*An error happened*/ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "STUN error, stopping\n"); stop_stun (); next_phase (ah); } } /** * Process list of local IP addresses. Find and set the * one of the default interface. * * @param cls our `struct GNUNET_NAT_AutoHandle` * @param name name of the interface (can be NULL for unknown) * @param isDefault is this presumably the default interface * @param addr address of this interface (can be NULL for unknown or unassigned) * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned) * @param netmask the network mask (can be NULL for unknown or unassigned)) * @param addrlen length of the @a addr and @a broadcast_addr * @return #GNUNET_OK to continue iteration, #GNUNET_SYSERR to abort */ static int process_if (void *cls, const char *name, int isDefault, const struct sockaddr *addr, const struct sockaddr *broadcast_addr, const struct sockaddr *netmask, socklen_t addrlen) { struct GNUNET_NAT_AutoHandle *ah = cls; const struct sockaddr_in *in; char buf[INET_ADDRSTRLEN]; if ( (sizeof (struct sockaddr_in6) == addrlen) && (0 != memcmp (&in6addr_loopback, &((const struct sockaddr_in6 *) addr)->sin6_addr, sizeof (struct in6_addr))) && (! IN6_IS_ADDR_LINKLOCAL(&((const struct sockaddr_in6 *) addr)->sin6_addr)) ) { ah->have_v6 = GNUNET_YES; GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("This system has a global IPv6 address, setting IPv6 to supported.\n")); return GNUNET_OK; } if (addrlen != sizeof (struct sockaddr_in)) return GNUNET_OK; in = (const struct sockaddr_in *) addr; /* set internal IP address */ if (NULL == inet_ntop (AF_INET, &in->sin_addr, buf, sizeof (buf))) { GNUNET_break (0); return GNUNET_OK; } GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "INTERNAL_ADDRESS", buf); GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Detected internal network address `%s'.\n"), buf); ah->ret = GNUNET_NAT_ERROR_SUCCESS; /* Check if our internal IP is the same as the External detect by STUN*/ if(ah->stun_ip && (strcmp(buf, ah->stun_ip) == 0) ) { ah->internal_ip_is_public = GNUNET_YES; GNUNET_log (GNUNET_ERROR_TYPE_INFO,"A internal IP is the sameas the external"); /* No need to continue*/ return GNUNET_SYSERR; } /* no need to continue iteration if we found the default */ if (!isDefault) return GNUNET_OK; else return GNUNET_SYSERR; } /** * Determine our local IP addresses; detect internal IP & IPv6-support * * @param ah auto setup context */ static void test_local_ip (struct GNUNET_NAT_AutoHandle *ah) { ah->have_v6 = GNUNET_NO; ah->ret = GNUNET_NAT_ERROR_NO_VALID_IF_IP_COMBO; // reset to success if any of the IFs in below iterator has a valid IP GNUNET_OS_network_interfaces_list (&process_if, ah); GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "DISABLEV6", (GNUNET_YES == ah->have_v6) ? "NO" : "YES"); next_phase (ah); } /** * We got disconnected from the NAT server. Stop * waiting for a reply. * * @param cls the `struct GNUNET_NAT_AutoHandle` * @param error error code */ static void mq_error_handler (void *cls, enum GNUNET_MQ_Error error) { struct GNUNET_NAT_AutoHandle *ah = cls; GNUNET_MQ_destroy (ah->mq); ah->mq = NULL; /* wait a bit first? */ next_phase (ah); } /** * Test if NAT has been punched * * @param ah auto setup context */ static void test_nat_punched (struct GNUNET_NAT_AutoHandle *ah) { struct GNUNET_NAT_TestMessage *msg; struct GNUNET_MQ_Envelope *env; if (! ah->stun_ip) { LOG (GNUNET_ERROR_TYPE_INFO, "We don't have a STUN IP"); next_phase (ah); return; } LOG (GNUNET_ERROR_TYPE_INFO, "Asking gnunet-nat-server to connect to `%s'\n", ah->stun_ip); ah->mq = GNUNET_CLIENT_connect (ah->cfg, "gnunet-nat-server", NULL, &mq_error_handler, ah); if (NULL == ah->mq) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Failed to connect to `gnunet-nat-server'\n")); next_phase (ah); return; } env = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_NAT_TEST); msg->dst_ipv4 = inet_addr (ah->stun_ip); msg->dport = htons (ah->stun_port); msg->data = port; msg->is_tcp = htonl ((uint32_t) GNUNET_NO); GNUNET_MQ_send (ah->mq, env); if (NULL != ltask4) { GNUNET_SCHEDULER_cancel (ltask4); ltask4 = GNUNET_SCHEDULER_add_read_net (NAT_SERVER_TIMEOUT, lsock4, &do_udp_read, ah); } } /** * Test if UPnPC works. * * @param ah auto setup context */ static void test_upnpc (struct GNUNET_NAT_AutoHandle *ah) { int have_upnpc; if (GNUNET_NAT_ERROR_SUCCESS != ah->ret) next_phase (ah); // test if upnpc is available have_upnpc = (GNUNET_SYSERR != GNUNET_OS_check_helper_binary ("upnpc", GNUNET_NO, NULL)); //FIXME: test if upnpc is actually working, that is, if transports start to work once we use UPnP GNUNET_log (GNUNET_ERROR_TYPE_INFO, (have_upnpc) ? _("upnpc found, enabling its use\n") : _("upnpc not found\n")); GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "ENABLE_UPNP", (GNUNET_YES == have_upnpc) ? "YES" : "NO"); next_phase (ah); } /** * Test if ICMP server is working * * @param ah auto setup context */ static void test_icmp_server (struct GNUNET_NAT_AutoHandle *ah) { int ext_ip; int nated; int binary; char *tmp; char *helper; ext_ip = GNUNET_NO; nated = GNUNET_NO; binary = GNUNET_NO; tmp = NULL; helper = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-nat-server"); if ( (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (ah->cfg, "nat", "EXTERNAL_ADDRESS", &tmp)) && (0 < strlen (tmp)) ) { ext_ip = GNUNET_OK; GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("test_icmp_server not possible, as we have no public IPv4 address\n")); } else goto err; if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (ah->cfg, "nat", "BEHIND_NAT")) { nated = GNUNET_YES; GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("test_icmp_server not possible, as we are not behind NAT\n")); } else goto err; if (GNUNET_YES == GNUNET_OS_check_helper_binary (helper, GNUNET_YES, "-d 127.0.0.1" )) { binary = GNUNET_OK; // use localhost as source for that one udp-port, ok for testing GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("No working gnunet-helper-nat-server found\n")); } err: GNUNET_free_non_null (tmp); GNUNET_free (helper); if ( (GNUNET_OK == ext_ip) && (GNUNET_YES == nated) && (GNUNET_OK == binary) ) ah->task = GNUNET_SCHEDULER_add_now (&reversal_test, ah); else next_phase (ah); } /** * Test if ICMP client is working * * @param ah auto setup context */ static void test_icmp_client (struct GNUNET_NAT_AutoHandle *ah) { char *tmp; char *helper; tmp = NULL; helper = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-nat-client"); if ( (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string (ah->cfg, "nat", "INTERNAL_ADDRESS", &tmp)) && (0 < strlen (tmp)) ) { GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("test_icmp_client not possible, as we have no internal IPv4 address\n")); } else goto err; if (GNUNET_YES != GNUNET_CONFIGURATION_get_value_yesno (ah->cfg, "nat", "BEHIND_NAT")) { GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("test_icmp_server not possible, as we are not behind NAT\n")); } else goto err; if (GNUNET_YES == GNUNET_OS_check_helper_binary (helper, GNUNET_YES, "-d 127.0.0.1 127.0.0.2 42")) { // none of these parameters are actually used in privilege testing mode GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("No working gnunet-helper-nat-server found\n")); } err: GNUNET_free_non_null (tmp); GNUNET_free (helper); next_phase (ah); } /** * Run the next phase of the auto test. */ static void next_phase (struct GNUNET_NAT_AutoHandle *ah) { struct GNUNET_CONFIGURATION_Handle *diff; ah->phase++; switch (ah->phase) { case AUTO_INIT: GNUNET_assert (0); break; case AUTO_EXTERNAL_IP: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Will run AUTO_EXTERNAL_IP\n"); test_external_ip (ah); break; case AUTO_STUN: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Will run AUTO_STUN\n"); test_stun (ah); break; case AUTO_LOCAL_IP: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Will run AUTO_LOCAL_IP\n"); test_local_ip (ah); break; case AUTO_NAT_PUNCHED: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Will run AUTO_NAT_PUNCHED\n"); test_nat_punched (ah); break; case AUTO_UPNPC: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Will run AUTO_UPNPC\n"); test_upnpc (ah); break; case AUTO_ICMP_SERVER: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Will run AUTO_ICMP_SERVER\n"); test_icmp_server (ah); break; case AUTO_ICMP_CLIENT: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Will run AUTO_ICMP_CLIENT\n"); test_icmp_client (ah); break; case AUTO_DONE: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Done with tests\n"); if (!ah->internal_ip_is_public) { GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "BEHIND_NAT", "YES"); if (ah->connected_back) { GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "PUNCHED_NAT", "YES"); } else { GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "PUNCHED_NAT", "NO"); } if (ah->stun_ip) { GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "EXTERNAL_ADDRESS", ah->stun_ip); if (ah->connected_back) { ah->type = GNUNET_NAT_TYPE_STUN_PUNCHED_NAT; GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "USE_STUN", "YES"); } else { ah->type = GNUNET_NAT_TYPE_UNREACHABLE_NAT; GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "USE_STUN", "NO"); } } if (0 != ah->stun_port) { GNUNET_CONFIGURATION_set_value_number (ah->cfg, "transport-udp", "ADVERTISED_PORT", ah->stun_port); } } else { //The internal IP is the same as public, but we didn't got a incoming connection if (ah->connected_back) { ah->type = GNUNET_NAT_TYPE_NO_NAT; GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "BEHIND_NAT", "NO"); } else { GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "BEHIND_NAT", "YES"); ah->type = GNUNET_NAT_TYPE_UNREACHABLE_NAT; if (ah->stun_ip) { GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "EXTERNAL_ADDRESS", ah->stun_ip); } if (0 != ah->stun_port) { GNUNET_CONFIGURATION_set_value_number (ah->cfg, "transport-udp", "ADVERTISED_PORT", ah->stun_port); } } } diff = GNUNET_CONFIGURATION_get_diff (ah->initial_cfg, ah->cfg); ah->fin_cb (ah->fin_cb_cls, diff, ah->ret, ah->type); GNUNET_CONFIGURATION_destroy (diff); GNUNET_NAT_autoconfig_cancel (ah); } } /** * Start auto-configuration routine. The resolver service should * be available when this function is called. * * @param cfg initial configuration * @param cb function to call with autoconfiguration result * @param cb_cls closure for @a cb * @return handle to cancel operation */ struct GNUNET_NAT_AutoHandle * GNUNET_NAT_autoconfig_start (const struct GNUNET_CONFIGURATION_Handle *cfg, GNUNET_NAT_AutoResultCallback cb, void *cb_cls) { struct GNUNET_NAT_AutoHandle *ah; ah = GNUNET_new (struct GNUNET_NAT_AutoHandle); ah->fin_cb = cb; ah->fin_cb_cls = cb_cls; ah->ret = GNUNET_NAT_ERROR_SUCCESS; ah->cfg = GNUNET_CONFIGURATION_dup (cfg); ah->initial_cfg = GNUNET_CONFIGURATION_dup (cfg); /* never use loopback addresses if user wanted autoconfiguration */ GNUNET_CONFIGURATION_set_value_string (ah->cfg, "nat", "USE_LOCALADDR", "NO"); next_phase (ah); return ah; } /** * Abort autoconfiguration. * * @param ah handle for operation to abort */ void GNUNET_NAT_autoconfig_cancel (struct GNUNET_NAT_AutoHandle *ah) { if (NULL != ah->tst) { GNUNET_NAT_test_stop (ah->tst); ah->tst = NULL; } if (NULL != ah->eh) { GNUNET_NAT_mini_get_external_ipv4_cancel (ah->eh); ah->eh = NULL; } if (NULL != ah->mq) { GNUNET_MQ_destroy (ah->mq); ah->mq = NULL; } if (NULL != ah->task) { GNUNET_SCHEDULER_cancel (ah->task); ah->task = NULL; } GNUNET_CONFIGURATION_destroy (ah->cfg); GNUNET_CONFIGURATION_destroy (ah->initial_cfg); GNUNET_free (ah); } /* end of nat_auto.c */