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/*
This file is part of GNUnet.
(C) 2009, 2010, 2011 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 3, 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 gns/gnunet-service-gns.c
* @brief GNUnet GNS service
* @author Martin Schanzenbach
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_transport_service.h"
#include "gnunet_dns_service.h"
#include "gnunet_dnsparser_lib.h"
#include "gnunet_gns_service.h"
#include "gns.h"
/* TODO into gnunet_protocols */
#define GNUNET_MESSAGE_TYPE_GNS_CLIENT_LOOKUP 23
#define GNUNET_MESSAGE_TYPE_GNS_CLIENT_RESULT 24
/**
* Our handle to the DNS handler library
*/
struct GNUNET_DNS_Handle *dns_handle;
/**
* The configuration the GNS service is running with
*/
const struct GNUNET_CONFIGURATION_Handle *GNS_cfg;
/**
* Our notification context.
*/
static struct GNUNET_SERVER_NotificationContext *nc;
/**
* Task run during shutdown.
*
* @param cls unused
* @param tc unused
*/
static void
shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
GNUNET_DNS_disconnect(dns_handle);
}
/**
* The DNS request handler
*
* @param cls closure
* @param rh request handle to user for reply
* @param request_length number of bytes in request
* @param request udp payload of the DNS request
*/
void
handle_dns_request(void *cls,
struct GNUNET_DNS_RequestHandle *rh,
size_t request_length,
const char *request)
{
/**
* TODO: parse request for tld
* Queue rh and gns handle (or use cls)
* How should lookup behave:
* - sync and return result or "NX"
* - async like dht with iter
* Maybe provide both, useful for cli app
**/
struct GNUNET_DNSPARSER_Packet *p;
int namelen;
int i;
char *tail;
p = GNUNET_DNSPARSER_parse (request, request_length);
if (NULL == p)
{
fprintf (stderr, "Received malformed DNS packet, leaving it untouched\n");
GNUNET_DNS_request_forward (rh);
return;
}
/**
* TODO factor out
* Check tld and decide if we or
* legacy dns is responsible
**/
for (i=0;i<p->num_queries;i++)
{
namelen = strlen(p->queries[i].name);
if (namelen >= 7)
{
/**
* TODO off by 1?
* Move our tld/root to config file
* Generate fake DNS reply that replaces .gnunet with .org
**/
tail = p->queries[i].name+(namelen-7);
if (0 == strcmp(tail, ".gnunet"))
{
/* Do db lookup here. Make dht lookup if necessary */
GNUNET_DNS_request_answer(rh, 0 /*length*/, NULL/*reply*/);
}
else
{
GNUNET_DNS_request_forward (rh);
}
}
}
}
/*TODO*/
static void
handle_client_record_lookup(void *cls,
struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
}
/*TODO*/
static void
handle_client_record_add(void *cls,
struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
}
/**
* Process GNS requests.
*
* @param cls closure
* @param server the initialized server
* @param c configuration to use
*/
static void
run (void *cls, struct GNUNET_SERVER_Handle *server,
const struct GNUNET_CONFIGURATION_Handle *c)
{
/* The IPC message types */
static const struct GNUNET_SERVER_MessageHandler handlers[] = {
/* callback, cls, type, size */
{&handle_client_record_lookup, NULL, GNUNET_MESSAGE_TYPE_GNS_CLIENT_LOOKUP,
0},
/*{&handle_client_record_add, NULL, GNUNET_MESSAGE_TYPE_GNS_CLIENT_ADD,
0},*/
{NULL, NULL, 0, 0}
};
nc = GNUNET_SERVER_notification_context_create (server, 1);
/* TODO do some config parsing */
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
NULL);
/**
* Do gnunet dns init here
* */
dns_handle = GNUNET_DNS_connect(c,
GNUNET_DNS_FLAG_PRE_RESOLUTION,
&handle_dns_request, /* rh */
NULL); /* Closure */
GNUNET_SERVER_add_handlers (server, handlers);
/**
* Esp the lookup would require to keep track of the clients' context
* See dht.
* GNUNET_SERVER_disconnect_notify (server, &client_disconnect, NULL);
**/
}
/**
* The main function for the GNS service.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc, char *const *argv)
{
int ret;
ret =
(GNUNET_OK ==
GNUNET_SERVICE_run (argc, argv, "gns", GNUNET_SERVICE_OPTION_NONE, &run,
NULL)) ? 0 : 1;
return ret;
}
/* end of gnunet-service-gns.c */
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