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/*
This file is part of GNUnet.
Copyright (C) 2010 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero 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.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file util/gnunet-resolver.c
* @brief tool to test resolver
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_resolver_service.h"
#define GET_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
/**
* Flag for reverse lookup.
*/
static int reverse;
/**
* Prints each hostname obtained from DNS.
*
* @param cls closure (unused)
* @param hostname one of the names for the host, NULL
* on the last call to the callback
*/
static void
print_hostname (void *cls,
const char *hostname)
{
(void) cls;
if (NULL == hostname)
return;
FPRINTF (stdout,
"%s\n",
hostname);
}
/**
* Callback function to display address.
*
* @param cls closure (unused)
* @param addr one of the addresses of the host, NULL for the last address
* @param addrlen length of the address
*/
static void
print_sockaddr (void *cls,
const struct sockaddr *addr,
socklen_t addrlen)
{
(void) cls;
if (NULL == addr)
return;
FPRINTF (stdout,
"%s\n",
GNUNET_a2s (addr,
addrlen));
}
/**
* Main function that will be run by the scheduler.
*
* @param cls closure
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param cfg configuration
*/
static void
run (void *cls,
char *const *args,
const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
const struct sockaddr *sa;
socklen_t salen;
struct sockaddr_in v4;
struct sockaddr_in6 v6;
(void) cls;
(void) cfgfile;
(void) cfg;
if (NULL == args[0])
return;
if (! reverse)
{
GNUNET_RESOLVER_ip_get (args[0],
AF_UNSPEC,
GET_TIMEOUT,
&print_sockaddr,
NULL);
return;
}
sa = NULL;
memset (&v4, 0, sizeof (v4));
v4.sin_family = AF_INET;
#if HAVE_SOCKADDR_IN_SIN_LEN
v4.sin_len = sizeof (v4);
#endif
if (1 == inet_pton (AF_INET,
args[0],
&v4.sin_addr))
{
sa = (struct sockaddr *) &v4;
salen = sizeof (v4);
}
memset (&v6, 0, sizeof (v6));
v6.sin6_family = AF_INET6;
#if HAVE_SOCKADDR_IN_SIN_LEN
v6.sin6_len = sizeof (v6);
#endif
if (1 == inet_pton (AF_INET6,
args[0],
&v6.sin6_addr))
{
sa = (struct sockaddr *) &v6;
salen = sizeof (v6);
}
if (NULL == sa)
{
fprintf (stderr,
"`%s' is not a valid IP: %s\n",
args[0],
strerror (errno));
return;
}
GNUNET_RESOLVER_hostname_get (sa, salen,
GNUNET_YES,
GET_TIMEOUT,
&print_hostname,
NULL);
}
/**
* The main function to access GNUnet's DNS resolver.
*
* @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)
{
struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_flag ('r',
"reverse",
gettext_noop ("perform a reverse lookup"),
&reverse),
GNUNET_GETOPT_OPTION_END
};
int ret;
if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
return 2;
ret = (GNUNET_OK ==
GNUNET_PROGRAM_run (argc, argv, "gnunet-resolver [hostname]",
gettext_noop ("Use build-in GNUnet stub resolver"),
options, &run, NULL)) ? 0 : 1;
GNUNET_free ((void*) argv);
return ret;
}
/* end of gnunet-resolver.c */
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