#include "gnunet_nat_lib.h"
#include "nat.h"
+#define LOG(kind,...) GNUNET_log_from (kind, "nat", __VA_ARGS__)
+
+/**
+ * Entry we keep for each incoming connection.
+ */
+struct NatActivity
+{
+ /**
+ * This is a doubly-linked list.
+ */
+ struct NatActivity *next;
+
+ /**
+ * This is a doubly-linked list.
+ */
+ struct NatActivity *prev;
+
+ /**
+ * Socket of the incoming connection.
+ */
+ struct GNUNET_NETWORK_Handle *sock;
+
+ /**
+ * Handle of the master context.
+ */
+ struct GNUNET_NAT_Test *h;
+
+ /**
+ * Task reading from the incoming connection.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier rtask;
+};
+
+
+/**
+ * Entry we keep for each connection to the gnunet-nat-service.
+ */
+struct ClientActivity
+{
+ /**
+ * This is a doubly-linked list.
+ */
+ struct ClientActivity *next;
+
+ /**
+ * This is a doubly-linked list.
+ */
+ struct ClientActivity *prev;
+
+ /**
+ * Socket of the incoming connection.
+ */
+ struct GNUNET_CLIENT_Connection *client;
+
+};
+
/**
* Handle to a NAT test.
*/
struct GNUNET_NAT_Test
{
+
+ /**
+ * Configuration used
+ */
+ const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+ /**
+ * Function to call with success report
+ */
GNUNET_NAT_TestCallback report;
-
+
+ /**
+ * Closure for 'report'.
+ */
void *report_cls;
+
+ /**
+ * Handle to NAT traversal in use
+ */
+ struct GNUNET_NAT_Handle *nat;
+
+ /**
+ * Handle to listen socket, or NULL
+ */
+ struct GNUNET_NETWORK_Handle *lsock;
+
+ /**
+ * Head of list of nat activities.
+ */
+ struct NatActivity *na_head;
+
+ /**
+ * Tail of list of nat activities.
+ */
+ struct NatActivity *na_tail;
+
+ /**
+ * Head of list of client activities.
+ */
+ struct ClientActivity *ca_head;
+
+ /**
+ * Tail of list of client activities.
+ */
+ struct ClientActivity *ca_tail;
+
+ /**
+ * Identity of task for the listen socket (if any)
+ */
+ GNUNET_SCHEDULER_TaskIdentifier ltask;
+
+ /**
+ * GNUNET_YES if we're testing TCP
+ */
+ int is_tcp;
+
+ /**
+ * Data that should be transmitted or source-port.
+ */
+ uint16_t data;
+
+ /**
+ * Advertised port to the other peer.
+ */
+ uint16_t adv_port;
+
};
+/**
+ * Function called from GNUNET_NAT_register whenever someone asks us
+ * to do connection reversal.
+ *
+ * @param cls closure, our 'struct GNUNET_NAT_Handle'
+ * @param addr public IP address of the other peer
+ * @param addrlen actual lenght of the address
+ */
+static void
+reversal_cb (void *cls, const struct sockaddr *addr, socklen_t addrlen)
+{
+ struct GNUNET_NAT_Test *h = cls;
+ const struct sockaddr_in *sa;
+
+ if (addrlen != sizeof (struct sockaddr_in))
+ return;
+ sa = (const struct sockaddr_in *) addr;
+ if (h->data != sa->sin_port)
+ {
+#if DEBUG_NAT
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received connection reversal request for wrong port\n");
+#endif
+ return; /* wrong port */
+ }
+ /* report success */
+ h->report (h->report_cls, GNUNET_OK);
+}
+
+
+/**
+ * Activity on our incoming socket. Read data from the
+ * incoming connection.
+ *
+ * @param cls the 'struct NatActivity'
+ * @param tc scheduler context
+ */
+static void
+do_udp_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_NAT_Test *tst = cls;
+ uint16_t data;
+
+ tst->ltask =
+ GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, tst->lsock,
+ &do_udp_read, tst);
+ if ((NULL != tc->write_ready) &&
+ (GNUNET_NETWORK_fdset_isset (tc->read_ready, tst->lsock)) &&
+ (sizeof (data) ==
+ GNUNET_NETWORK_socket_recv (tst->lsock, &data, sizeof (data))))
+ {
+ if (data == tst->data)
+ tst->report (tst->report_cls, GNUNET_OK);
+#if DEBUG_NAT
+ else
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received data mismatches expected value\n");
+#endif
+ }
+#if DEBUG_NAT
+ else
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Failed to receive data from inbound connection\n");
+#endif
+}
+
+
+/**
+ * Activity on our incoming socket. Read data from the
+ * incoming connection.
+ *
+ * @param cls the 'struct NatActivity'
+ * @param tc scheduler context
+ */
+static void
+do_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct NatActivity *na = cls;
+ struct GNUNET_NAT_Test *tst;
+ uint16_t data;
+
+ na->rtask = GNUNET_SCHEDULER_NO_TASK;
+ tst = na->h;
+ GNUNET_CONTAINER_DLL_remove (tst->na_head, tst->na_tail, na);
+ if ((NULL != tc->write_ready) &&
+ (GNUNET_NETWORK_fdset_isset (tc->read_ready, na->sock)) &&
+ (sizeof (data) ==
+ GNUNET_NETWORK_socket_recv (na->sock, &data, sizeof (data))))
+ {
+ if (data == tst->data)
+ tst->report (tst->report_cls, GNUNET_OK);
+#if DEBUG_NAT
+ else
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received data mismatches expected value\n");
+#endif
+ }
+#if DEBUG_NAT
+ else
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Failed to receive data from inbound connection\n");
+#endif
+ GNUNET_NETWORK_socket_close (na->sock);
+ GNUNET_free (na);
+}
+
+
+/**
+ * Activity on our listen socket. Accept the
+ * incoming connection.
+ *
+ * @param cls the 'struct GNUNET_NAT_Test'
+ * @param tc scheduler context
+ */
+static void
+do_accept (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_NAT_Test *tst = cls;
+ struct GNUNET_NETWORK_Handle *s;
+ struct NatActivity *wl;
+
+ tst->ltask = GNUNET_SCHEDULER_NO_TASK;
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+ tst->ltask =
+ GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, tst->lsock,
+ &do_accept, tst);
+ s = GNUNET_NETWORK_socket_accept (tst->lsock, NULL, NULL);
+ if (NULL == s)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO, "accept");
+ return; /* odd error */
+ }
+#if DEBUG_NAT
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Got an inbound connection, waiting for data\n");
+#endif
+ wl = GNUNET_malloc (sizeof (struct NatActivity));
+ wl->sock = s;
+ wl->h = tst;
+ wl->rtask =
+ GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL, wl->sock,
+ &do_read, wl);
+ GNUNET_CONTAINER_DLL_insert (tst->na_head, tst->na_tail, wl);
+}
+
+
+/**
+ * Address-callback, used to send message to gnunet-nat-server.
+ *
+ * @param cls closure
+ * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
+ * the previous (now invalid) one
+ * @param addr either the previous or the new public IP address
+ * @param addrlen actual lenght of the address
+ */
+static void
+addr_cb (void *cls, int add_remove, const struct sockaddr *addr,
+ socklen_t addrlen)
+{
+ struct GNUNET_NAT_Test *h = cls;
+ struct ClientActivity *ca;
+ struct GNUNET_CLIENT_Connection *client;
+ struct GNUNET_NAT_TestMessage msg;
+ const struct sockaddr_in *sa;
+
+ if (GNUNET_YES != add_remove)
+ return;
+ if (addrlen != sizeof (struct sockaddr_in))
+ return; /* ignore IPv6 here */
+#if DEBUG_NAT
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Asking gnunet-nat-server to connect to `%s'\n",
+ GNUNET_a2s (addr, addrlen));
+#endif
+ sa = (const struct sockaddr_in *) addr;
+ msg.header.size = htons (sizeof (struct GNUNET_NAT_TestMessage));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_NAT_TEST);
+ msg.dst_ipv4 = sa->sin_addr.s_addr;
+ msg.dport = sa->sin_port;
+ msg.data = h->data;
+ msg.is_tcp = htonl ((uint32_t) h->is_tcp);
+
+ client = GNUNET_CLIENT_connect ("gnunet-nat-server", h->cfg);
+ if (NULL == client)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to connect to `gnunet-nat-server'\n"));
+ return;
+ }
+ ca = GNUNET_malloc (sizeof (struct ClientActivity));
+ ca->client = client;
+ GNUNET_CONTAINER_DLL_insert (h->ca_head, h->ca_tail, ca);
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_CLIENT_transmit_and_get_response (client, &msg.header,
+ GNUNET_TIME_UNIT_SECONDS,
+ GNUNET_YES, NULL,
+ NULL));
+}
+
+
/**
* Start testing if NAT traversal works using the
* given configuration (IPv4-only).
*
* @param cfg configuration for the NAT traversal
* @param is_tcp GNUNET_YES to test TCP, GNUNET_NO to test UDP
- * @param bnd_port port to bind to
+ * @param bnd_port port to bind to, 0 for connection reversal
* @param adv_port externally advertised port to use
* @param report function to call with the result of the test
* @param report_cls closure for report
*/
struct GNUNET_NAT_Test *
GNUNET_NAT_test_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
- int is_tcp,
- uint16_t bnd_port,
- uint16_t adv_port,
- GNUNET_NAT_TestCallback report,
- void *report_cls)
+ int is_tcp, uint16_t bnd_port, uint16_t adv_port,
+ GNUNET_NAT_TestCallback report, void *report_cls)
{
- return NULL;
+ struct GNUNET_NAT_Test *ret;
+ struct sockaddr_in sa;
+ const struct sockaddr *addrs[] = { (const struct sockaddr *) &sa };
+ const socklen_t addrlens[] = { sizeof (sa) };
+
+ memset (&sa, 0, sizeof (sa));
+ sa.sin_family = AF_INET;
+ sa.sin_port = htons (bnd_port);
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ sa.sin_len = sizeof (sa);
+#endif
+
+ ret = GNUNET_malloc (sizeof (struct GNUNET_NAT_Test));
+ ret->cfg = cfg;
+ ret->is_tcp = is_tcp;
+ ret->data = bnd_port;
+ ret->adv_port = adv_port;
+ ret->report = report;
+ ret->report_cls = report_cls;
+ if (bnd_port == 0)
+ {
+ ret->nat =
+ GNUNET_NAT_register (cfg, is_tcp, 0, 0, NULL, NULL, &addr_cb,
+ &reversal_cb, ret);
+ }
+ else
+ {
+ ret->lsock =
+ GNUNET_NETWORK_socket_create (AF_INET,
+ (is_tcp ==
+ GNUNET_YES) ? SOCK_STREAM : SOCK_DGRAM,
+ 0);
+ if ((ret->lsock == NULL) ||
+ (GNUNET_OK !=
+ GNUNET_NETWORK_socket_bind (ret->lsock, (const struct sockaddr *) &sa,
+ sizeof (sa))))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("Failed to create listen socket bound to `%s' for NAT test: %s\n"),
+ GNUNET_a2s ((const struct sockaddr *) &sa, sizeof (sa)),
+ STRERROR (errno));
+ if (NULL != ret->lsock)
+ GNUNET_NETWORK_socket_close (ret->lsock);
+ GNUNET_free (ret);
+ return NULL;
+ }
+ if (GNUNET_YES == is_tcp)
+ {
+ GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_listen (ret->lsock, 5));
+ ret->ltask =
+ GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ ret->lsock, &do_accept, ret);
+ }
+ else
+ {
+ ret->ltask =
+ GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ ret->lsock, &do_udp_read, ret);
+ }
+ ret->nat =
+ GNUNET_NAT_register (cfg, is_tcp, adv_port, 1, addrs, addrlens,
+ &addr_cb, NULL, ret);
+ }
+ return ret;
}
void
GNUNET_NAT_test_stop (struct GNUNET_NAT_Test *tst)
{
+ struct NatActivity *pos;
+ struct ClientActivity *cpos;
+
+ while (NULL != (cpos = tst->ca_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (tst->ca_head, tst->ca_tail, cpos);
+ GNUNET_CLIENT_disconnect (cpos->client, GNUNET_NO);
+ GNUNET_free (cpos);
+ }
+ while (NULL != (pos = tst->na_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (tst->na_head, tst->na_tail, pos);
+ GNUNET_SCHEDULER_cancel (pos->rtask);
+ GNUNET_NETWORK_socket_close (pos->sock);
+ GNUNET_free (pos);
+ }
+ if (GNUNET_SCHEDULER_NO_TASK != tst->ltask)
+ GNUNET_SCHEDULER_cancel (tst->ltask);
+ if (NULL != tst->lsock)
+ GNUNET_NETWORK_socket_close (tst->lsock);
+ GNUNET_NAT_unregister (tst->nat);
GNUNET_free (tst);
}
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