/**
* @file src/nat/gnunet-nat.c
- * @brief Daemon to auto configure nat
+ * @brief Command-line tool to interact with the NAT service
* @author Christian Grothoff
* @author Bruno Cabral
*/
static int global_ret;
/**
- * Handle to ongoing autoconfiguration.
- */
-static struct GNUNET_NAT_AutoHandle *ah;
-
-/**
- * Port we use.
+ * Name of section in configuration file to use for
+ * additional options.
*/
-static unsigned int port;
+static char *section_name;
/**
* Flag set to 1 if we use IPPROTO_UDP.
*/
static uint8_t proto;
-/**
- * Address we are bound to (in test), or should bind to
- * (if #do_stun is set).
- */
-static char *bind_addr;
-
-/**
- * External IP address and port to use for the test.
- * If not set, use #bind_addr.
- */
-static char *extern_addr;
-
/**
* Local address to use for connection reversal request.
*/
static unsigned int do_stun;
/**
- * Should we run autoconfiguration?
+ * Handle to NAT operation.
*/
-static unsigned int do_auto;
+static struct GNUNET_NAT_Handle *nh;
/**
- * Handle to a NAT test operation.
- */
-static struct GNUNET_NAT_Test *nt;
+ * Listen socket for STUN processing.
+ */
+static struct GNUNET_NETWORK_Handle *ls;
/**
- * Handle to NAT operation.
+ * Task for reading STUN packets.
*/
-static struct GNUNET_NAT_Handle *nh;
+static struct GNUNET_SCHEDULER_Task *rtask;
/**
static void
test_finished ()
{
- if (NULL != ah)
- return;
- if (NULL != nt)
- return;
if (NULL != nh)
return;
+ if (NULL != rtask)
+ return;
GNUNET_SCHEDULER_shutdown ();
}
/**
- * Function to iterate over sugested changes options
+ * Signature of the callback passed to #GNUNET_NAT_register() for
+ * a function to call whenever our set of 'valid' addresses changes.
*
- * @param cls closure
- * @param section name of the section
- * @param option name of the option
- * @param value value of the option
+ * @param cls closure, NULL
+ * @param add_remove #GNUNET_YES to add a new public IP address,
+ * #GNUNET_NO to remove a previous (now invalid) one
+ * @param ac address class the address belongs to
+ * @param addr either the previous or the new public IP address
+ * @param addrlen actual length of the @a addr
*/
static void
-auto_conf_iter (void *cls,
- const char *section,
- const char *option,
- const char *value)
+address_cb (void *cls,
+ int add_remove,
+ enum GNUNET_NAT_AddressClass ac,
+ const struct sockaddr *addr,
+ socklen_t addrlen)
{
- PRINTF ("%s: %s\n",
- option,
- value);
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "%s %s (%d)\n",
+ add_remove ? "+" : "-",
+ GNUNET_a2s (addr,
+ addrlen),
+ (int) ac);
}
/**
- * Function called with the result from the autoconfiguration.
+ * Signature of the callback passed to #GNUNET_NAT_register().
+ * for a function to call whenever someone asks us to do connection
+ * reversal.
*
- * @param cls closure
- * @param diff minimal suggested changes to the original configuration
- * to make it work (as best as we can)
- * @param result #GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
- * @param type what the situation of the NAT
+ * @param cls closure, NULL
+ * @param remote_addr public IP address of the other peer
+ * @param remote_addrlen actual length of the @a remote_addr
*/
static void
-auto_config_cb (void *cls,
- const struct GNUNET_CONFIGURATION_Handle *diff,
- enum GNUNET_NAT_StatusCode result,
- enum GNUNET_NAT_Type type)
+reversal_cb (void *cls,
+ const struct sockaddr *remote_addr,
+ socklen_t remote_addrlen)
{
- const char *nat_type;
- char unknown_type[64];
-
- ah = NULL;
- switch (type)
- {
- case GNUNET_NAT_TYPE_NO_NAT:
- nat_type = "NO NAT";
- break;
- case GNUNET_NAT_TYPE_UNREACHABLE_NAT:
- nat_type = "NAT but we can traverse";
- break;
- case GNUNET_NAT_TYPE_STUN_PUNCHED_NAT:
- nat_type = "NAT but STUN is able to identify the correct information";
- break;
- case GNUNET_NAT_TYPE_UPNP_NAT:
- nat_type = "NAT but UPNP opened the ports";
- break;
- default:
- SPRINTF (unknown_type,
- "NAT unknown, type %u",
- type);
- nat_type = unknown_type;
- }
-
- PRINTF ("NAT status: %s/%s\n",
- GNUNET_NAT_status2string (result),
- nat_type);
-
- PRINTF ("SUGGESTED CHANGES:\n");
- GNUNET_CONFIGURATION_iterate_section_values (diff,
- "nat",
- &auto_conf_iter,
- NULL);
- // Have option to save config
- test_finished ();
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "Connection reversal requested by %s\n",
+ GNUNET_a2s (remote_addr,
+ remote_addrlen));
}
static void
do_shutdown (void *cls)
{
- if (NULL != ah)
+ if (NULL != nh)
{
- GNUNET_NAT_autoconfig_cancel (ah);
- ah = NULL;
+ GNUNET_NAT_unregister (nh);
+ nh = NULL;
}
- if (NULL != nt)
+ if (NULL != ls)
{
- GNUNET_NAT_test_stop (nt);
- nt = NULL;
+ GNUNET_NETWORK_socket_close (ls);
+ ls = NULL;
}
- if (NULL != nh)
+ if (NULL != rtask)
{
- GNUNET_NAT_unregister (nh);
- nh = NULL;
+ GNUNET_SCHEDULER_cancel (rtask);
+ rtask = NULL;
+ }
+}
+
+
+/**
+ * Task to receive incoming packets for STUN processing.
+ */
+static void
+stun_read_task (void *cls)
+{
+ ssize_t size;
+
+ rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ ls,
+ &stun_read_task,
+ NULL);
+ size = GNUNET_NETWORK_socket_recvfrom_amount (ls);
+ if (size > 0)
+ {
+ GNUNET_break (0);
+ GNUNET_SCHEDULER_shutdown ();
+ global_ret = 1;
+ return;
+ }
+ {
+ char buf[size + 1];
+ struct sockaddr_storage sa;
+ socklen_t salen = sizeof (sa);
+ ssize_t ret;
+
+ ret = GNUNET_NETWORK_socket_recvfrom (ls,
+ buf,
+ size + 1,
+ (struct sockaddr *) &sa,
+ &salen);
+ if (ret != size)
+ {
+ GNUNET_break (0);
+ GNUNET_SCHEDULER_shutdown ();
+ global_ret = 1;
+ return;
+ }
+ (void) GNUNET_NAT_stun_handle_packet (nh,
+ (const struct sockaddr *) &sa,
+ salen,
+ buf,
+ ret);
}
}
const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *c)
{
+ uint8_t af;
+ struct sockaddr *local_sa;
+ struct sockaddr *remote_sa;
+ socklen_t local_len;
+ size_t remote_len;
+
if (use_tcp && use_udp)
{
GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
proto = IPPROTO_TCP;
if (use_udp)
proto = IPPROTO_UDP;
+
+ GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
+ NULL);
+
if (0 == proto)
{
GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
global_ret = 1;
return;
}
- if (do_auto)
+ if (NULL != local_addr)
{
- ah = GNUNET_NAT_autoconfig_start (c,
- &auto_config_cb,
- NULL);
+ local_len = (socklen_t) GNUNET_STRINGS_parse_socket_addr (local_addr,
+ &af,
+ &local_sa);
+ if (0 == local_len)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "Invalid socket address `%s'\n",
+ local_addr);
+ global_ret = 1;
+ return;
+ }
}
- GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
- NULL);
+
+ remote_len = 0;
+
+ if (NULL != remote_addr)
+ {
+ remote_len = GNUNET_STRINGS_parse_socket_addr (remote_addr,
+ &af,
+ &remote_sa);
+ if (0 == remote_len)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "Invalid socket address `%s'\n",
+ remote_addr);
+ global_ret = 1;
+ return;
+ }
+ }
+
+ if (NULL != local_addr)
+ {
+ if (NULL == section_name)
+ section_name = GNUNET_strdup ("undefined");
+ nh = GNUNET_NAT_register (c,
+ section_name,
+ proto,
+ 1,
+ (const struct sockaddr **) &local_sa,
+ &local_len,
+ &address_cb,
+ (listen_reversal) ? &reversal_cb : NULL,
+ NULL);
+ }
+ else if (listen_reversal)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "Use of `-W` only effective in combination with `-i`\n");
+ global_ret = 1;
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+
+ if (NULL != remote_addr)
+ {
+ int ret;
+
+ if ( (NULL == nh) ||
+ (sizeof (struct sockaddr_in) != local_len) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "Require IPv4 local address to initiate connection reversal\n");
+ global_ret = 1;
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ if (sizeof (struct sockaddr_in) != remote_len)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "Require IPv4 reversal target address\n");
+ global_ret = 1;
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ GNUNET_assert (AF_INET == local_sa->sa_family);
+ GNUNET_assert (AF_INET == remote_sa->sa_family);
+ ret = GNUNET_NAT_request_reversal (nh,
+ (const struct sockaddr_in *) local_sa,
+ (const struct sockaddr_in *) remote_sa);
+ switch (ret)
+ {
+ case GNUNET_SYSERR:
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "Connection reversal internal error\n");
+ break;
+ case GNUNET_NO:
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "Connection reversal unavailable\n");
+ break;
+ case GNUNET_OK:
+ /* operation in progress */
+ break;
+ }
+ }
+
+ if (do_stun)
+ {
+ if (NULL == local_addr)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "Require local address to support STUN requests\n");
+ global_ret = 1;
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ if (IPPROTO_UDP != proto)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
+ "STUN only supported over UDP\n");
+ global_ret = 1;
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ ls = GNUNET_NETWORK_socket_create (af,
+ SOCK_DGRAM,
+ IPPROTO_UDP);
+ if (GNUNET_OK !=
+ GNUNET_NETWORK_socket_bind (ls,
+ local_sa,
+ local_len))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Failed to bind to %s: %s\n",
+ GNUNET_a2s (local_sa,
+ local_len),
+ STRERROR (errno));
+ global_ret = 1;
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ ls,
+ &stun_read_task,
+ NULL);
+ }
+
test_finished ();
}
char *const argv[])
{
static const struct GNUNET_GETOPT_CommandLineOption options[] = {
- {'a', "auto", NULL,
- gettext_noop ("run autoconfiguration"),
- GNUNET_NO, &GNUNET_GETOPT_set_one, &do_auto },
- {'b', "bind", "ADDRESS",
- gettext_noop ("which IP and port are we bound to"),
- GNUNET_YES, &GNUNET_GETOPT_set_string, &bind_addr},
- {'e', "external", "ADDRESS",
- gettext_noop ("which external IP and port should be used to test"),
- GNUNET_YES, &GNUNET_GETOPT_set_string, &extern_addr},
- {'l', "local", "ADDRESS",
- gettext_noop ("which IP and port are we locally using to listen to for connection reversals"),
- GNUNET_YES, &GNUNET_GETOPT_set_string, &local_addr},
+ {'i', "in", "ADDRESS",
+ gettext_noop ("which IP and port are we locally using to bind/listen to"),
+ GNUNET_YES, &GNUNET_GETOPT_set_string, &local_addr },
{'r', "remote", "ADDRESS",
gettext_noop ("which remote IP and port should be asked for connection reversal"),
- GNUNET_YES, &GNUNET_GETOPT_set_string, &remote_addr},
- {'L', "listen", NULL,
- gettext_noop ("listen for connection reversal requests"),
- GNUNET_NO, &GNUNET_GETOPT_set_one, &listen_reversal },
- {'p', "port", NULL,
- gettext_noop ("port to use"),
- GNUNET_YES, &GNUNET_GETOPT_set_uint, &port},
+ GNUNET_YES, &GNUNET_GETOPT_set_string, &remote_addr },
+ {'S', "section", NULL,
+ gettext_noop ("name of configuration section to find additional options, such as manual host punching data"),
+ GNUNET_YES, &GNUNET_GETOPT_set_string, §ion_name },
{'s', "stun", NULL,
gettext_noop ("enable STUN processing"),
GNUNET_NO, &GNUNET_GETOPT_set_one, &do_stun },
{'u', "udp", NULL,
gettext_noop ("use UDP"),
GNUNET_NO, &GNUNET_GETOPT_set_one, &use_udp },
+ {'W', "watch", NULL,
+ gettext_noop ("watch for connection reversal requests"),
+ GNUNET_NO, &GNUNET_GETOPT_set_one, &listen_reversal },
GNUNET_GETOPT_OPTION_END
};
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