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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/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @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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