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
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
*/
/**
- * @file transport/plugin_transport_dv.c
+ * @file dv/plugin_transport_dv.c
* @brief DV transport service, takes incoming DV requests and deals with
* the DV service
+ * @author Nathan Evans
* @author Christian Grothoff
*/
-/**
- * TODO:
- *
- * As a start, the dv plugin needs to listen for information from the dv
- * service. The plugin (?) will be notified by core (?) when a tcp/udp/whatever
- * message comes in that should be for dv. The plugin will then hand off the message
- * to the dv service which will decrypt/validate the message (?) and then send the
- * result back to us (the transport) which will then send the message to the transport
- * service (yikes).
- *
- * Or, core will notify the dv service directly which will validate,
- * etc. and then just send a message to us.
- *
- * For starters, this plugin needs to have a client which will listen for messages from
- * the dv service that need to be sent up to the gnunet-transport-service.
- *
- * Messages sent from the dv transport get passed to the dv service which deals
- * with the actual sending (how much state does this transport need? should it know
- * which peers it is currently connected to and their distances, or just assume that
- * anything should be passed along to the dv service?).
- */
#include "platform.h"
#include "gnunet_protocols.h"
#include "gnunet_connection_lib.h"
#include "gnunet_statistics_service.h"
#include "gnunet_dv_service.h"
#include "gnunet_transport_service.h"
-#include "../transport/plugin_transport.h"
+#include "gnunet_transport_plugin.h"
#include "dv.h"
-#define DEBUG_TEMPLATE GNUNET_NO
+#define DEBUG_TEMPLATE GNUNET_EXTRA_LOGGING
/**
* Encapsulation of all of the state of the plugin.
*/
struct Session *sessions;
- /**
- * Handle for the statistics service.
- */
- struct GNUNET_STATISTICS_Handle *statistics;
-
/**
* Our server.
*/
};
-
-void handle_dv_message_received (void *cls,
- struct GNUNET_PeerIdentity *sender,
- struct GNUNET_MessageHeader *msg,
- unsigned int distance,
- char *sender_address,
- size_t sender_address_len)
+/**
+ * Handler for messages received from the DV service.
+ */
+void
+handle_dv_message_received (void *cls, struct GNUNET_PeerIdentity *sender,
+ char *msg, size_t msg_len, uint32_t distance,
+ char *sender_address, size_t sender_address_len)
{
struct Plugin *plugin = cls;
- plugin->env->receive(plugin,
- sender,
- msg,
- distance,
- sender_address,
- sender_address_len);
+#if DEBUG_DV_MESSAGES
+ char *my_id;
+
+ my_id = GNUNET_strdup (GNUNET_i2s (plugin->env->my_identity));
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "plugin_transport_dv",
+ _("%s Received message from %s of type %d, distance %u!\n"),
+ my_id, GNUNET_i2s (sender),
+ ntohs (((struct GNUNET_MessageHeader *) msg)->type),
+ distance);
+ GNUNET_free_non_null (my_id);
+#endif
+ struct GNUNET_ATS_Information ats[2];
+
+ ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
+ ats[0].value = htonl (distance);
+ ats[1].type = htonl (GNUNET_ATS_ARRAY_TERMINATOR);
+ ats[1].value = htonl (0);
+
+ plugin->env->receive (plugin->env->cls, sender,
+ (struct GNUNET_MessageHeader *) msg,
+ (const struct GNUNET_ATS_Information *) &ats,
+ 2, NULL, sender_address, sender_address_len);
}
* @param msgbuf the message to transmit
* @param msgbuf_size number of bytes in 'msgbuf'
* @param timeout when should we time out
+ * @param session the session used
* @param addr the address to use (can be NULL if the plugin
* is "on its own" (i.e. re-use existing TCP connection))
* @param addrlen length of the address in bytes
* and does NOT mean that the message was not transmitted (DV)
*/
static ssize_t
-dv_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)
+dv_plugin_send (void *cls, const struct GNUNET_PeerIdentity *target,
+ const char *msgbuf, size_t msgbuf_size, unsigned int priority,
+ struct GNUNET_TIME_Relative timeout, struct Session *session,
+ const void *addr, size_t addrlen, int force_address,
+ GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
{
int ret = 0;
struct Plugin *plugin = cls;
- /* FIXME: do we want the dv plugin to remember sent messages to call continuation once message actually goes out?
- * Or do we just call the continuation once we've notified the plugin?
- */
- ret = GNUNET_DV_send(plugin->dv_handle,
- target,
- msgbuf,
- msgbuf_size,
- priority,
- timeout,
- addr,
- addrlen);
- /*, cont, cont_cls);*/
-
- if (ret == 0)
- cont(cls, target, GNUNET_OK);
- else
- cont(cls, target, GNUNET_SYSERR);
-
+ ret =
+ GNUNET_DV_send (plugin->dv_handle, target, msgbuf, msgbuf_size, priority,
+ timeout, addr, addrlen, cont, cont_cls);
return ret;
}
* @param target peer from which to disconnect
*/
static void
-dv_plugin_disconnect (void *cls,
- const struct GNUNET_PeerIdentity *target)
+dv_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
{
// struct Plugin *plugin = cls;
// TODO: Add message type to send to dv service to "disconnect" a peer
* @param asc_cls closure for asc
*/
static void
-dv_plugin_address_pretty_printer (void *cls,
- const char *type,
- const void *addr,
- size_t addrlen,
- int numeric,
+dv_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)
+ GNUNET_TRANSPORT_AddressStringCallback asc,
+ void *asc_cls)
{
- asc (asc_cls, NULL);
+ char *dest_peer;
+ char *via_peer;
+ char *print_string;
+ char *addr_buf = (char *) addr;
+
+ if (addrlen != sizeof (struct GNUNET_PeerIdentity) * 2)
+ {
+ asc (asc_cls, NULL);
+ }
+ else
+ {
+ dest_peer =
+ GNUNET_strdup (GNUNET_i2s ((struct GNUNET_PeerIdentity *) addr));
+ via_peer =
+ GNUNET_strdup (GNUNET_i2s
+ ((struct GNUNET_PeerIdentity *)
+ &addr_buf[sizeof (struct GNUNET_PeerIdentity)]));
+ GNUNET_asprintf (&print_string, "DV Peer `%s' via peer`%s'", dest_peer,
+ via_peer);
+ asc (asc_cls, print_string);
+ asc (asc_cls, NULL);
+ GNUNET_free (via_peer);
+ GNUNET_free (dest_peer);
+ GNUNET_free (print_string);
+ }
}
+/**
+ * Convert the DV address to a pretty string.
+ *
+ * @param cls closure
+ * @param addr the (hopefully) DV address
+ * @param addrlen the length of the address
+ *
+ * @return string representing the DV address
+ */
+static const char *
+address_to_string (void *cls, const void *addr, size_t addrlen)
+{
+ static char return_buffer[2 * 4 + 2]; // Two four character peer identity prefixes a ':' and '\0'
+
+ struct GNUNET_CRYPTO_HashAsciiEncoded peer_hash;
+ struct GNUNET_CRYPTO_HashAsciiEncoded via_hash;
+ struct GNUNET_PeerIdentity *peer;
+ struct GNUNET_PeerIdentity *via;
+ char *addr_buf = (char *) addr;
+ if (addrlen == (2 * sizeof (struct GNUNET_PeerIdentity)))
+ {
+ peer = (struct GNUNET_PeerIdentity *) addr_buf;
+ via =
+ (struct GNUNET_PeerIdentity *)
+ &addr_buf[sizeof (struct GNUNET_PeerIdentity)];
+
+ GNUNET_CRYPTO_hash_to_enc (&peer->hashPubKey, &peer_hash);
+ peer_hash.encoding[4] = '\0';
+ GNUNET_CRYPTO_hash_to_enc (&via->hashPubKey, &via_hash);
+ via_hash.encoding[4] = '\0';
+ GNUNET_snprintf (return_buffer, sizeof (return_buffer), "%s:%s", &peer_hash,
+ &via_hash);
+ }
+ else
+ return NULL;
+
+ return return_buffer;
+}
/**
- * Another peer has suggested an address for this
- * peer and transport plugin. Check that this could be a valid
- * address. If so, consider adding it to the list
- * of addresses.
+ * 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 to this peer (and make sure that
+ * the address really corresponds to our network connection/settings
+ * and not some potential man-in-the-middle).
*
* @param cls closure
* @param addr pointer to the address
* @param addrlen length of addr
* @return GNUNET_OK if this is a plausible address for this peer
- * and transport
+ * and transport, GNUNET_SYSERR if not
*
- * FIXME: does this mean anything for the DV plugin?
*/
static int
-dv_plugin_address_suggested (void *cls,
- void *addr, size_t addrlen)
+dv_plugin_check_address (void *cls, const void *addr, size_t addrlen)
{
- /* struct Plugin *plugin = cls; */
+ struct Plugin *plugin = cls;
- /* check if the address is plausible; if so,
- add it to our list! */
- return GNUNET_NO;
+ /* Verify that the first peer of this address matches our peer id! */
+ if ((addrlen != (2 * sizeof (struct GNUNET_PeerIdentity))) ||
+ (0 !=
+ memcmp (addr, plugin->env->my_identity,
+ sizeof (struct GNUNET_PeerIdentity))))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "%s: Address not correct size or identity doesn't match ours!\n",
+ GNUNET_i2s (plugin->env->my_identity));
+ if (addrlen == (2 * sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer in address is %s\n",
+ GNUNET_i2s (addr));
+ }
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
}
struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
struct GNUNET_TRANSPORT_PluginFunctions *api;
struct Plugin *plugin;
- struct GNUNET_SERVICE_Context *service;
-
- /**
- * Do we not even need a service for this thing? That's peculiar.
- */
- /*
- service = GNUNET_SERVICE_start ("transport-dv", env->sched, env->cfg);
- if (service == NULL)
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
- "dv",
- _
- ("Failed to start service for `%s' transport plugin.\n"),
- "dv");
- return NULL;
- }
- */
- /**
- * I don't think we need a port, the only way we get stuff is being directly
- * called by service transport or by responses from the dv-service via our
- * client handle
- */
- /*
- if ((GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-dv",
- "PORT",
- &port)))
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
- "dv",
- _
- ("Require valid port number for service `%s' in configuration!\n"),
- "transport-dv");
- GNUNET_SERVICE_stop (service);
- return NULL;
- }
- */
plugin = GNUNET_malloc (sizeof (struct Plugin));
plugin->env = env;
- plugin->statistics = NULL;
- //plugin->service = service;
- //plugin->server = GNUNET_SERVICE_get_server (service);
- plugin->dv_handle = GNUNET_DV_connect(env->sched, env->cfg, &handle_dv_message_received, plugin);
+ plugin->dv_handle =
+ GNUNET_DV_connect (env->cfg, &handle_dv_message_received, plugin);
if (plugin->dv_handle == NULL)
{
- GNUNET_free(plugin);
+ GNUNET_free (plugin);
return NULL;
}
api->send = &dv_plugin_send;
api->disconnect = &dv_plugin_disconnect;
api->address_pretty_printer = &dv_plugin_address_pretty_printer;
- api->check_address = &dv_plugin_address_suggested;
+ api->check_address = &dv_plugin_check_address;
+ api->address_to_string = &address_to_string;
return api;
}
struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
struct Plugin *plugin = api->cls;
+ if (plugin->dv_handle != NULL)
+ GNUNET_DV_disconnect (plugin->dv_handle);
+
GNUNET_free (plugin);
GNUNET_free (api);
return NULL;
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