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- /*
- This file is part of GNUnet.
- Copyright (C) 2012-2013, 2017-2018 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 gnunet-gns.c
- * @brief command line tool to access distributed GNS
- * @author Christian Grothoff
- */
- #include "platform.h"
- #if HAVE_LIBIDN2
- #if HAVE_IDN2_H
- #include <idn2.h>
- #elif HAVE_IDN2_IDN2_H
- #include <idn2/idn2.h>
- #endif
- #elif HAVE_LIBIDN
- #if HAVE_IDNA_H
- #include <idna.h>
- #elif HAVE_IDN_IDNA_H
- #include <idn/idna.h>
- #endif
- #endif
- #include <gnunet_util_lib.h>
- #include <gnunet_dnsparser_lib.h>
- #include <gnunet_gnsrecord_lib.h>
- #include <gnunet_namestore_service.h>
- #include <gnunet_gns_service.h>
- /**
- * Configuration we are using.
- */
- static const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Handle to GNS service.
- */
- static struct GNUNET_GNS_Handle *gns;
- /**
- * GNS name to lookup. (-u option)
- */
- static char *lookup_name;
- /**
- * DNS IDNA name to lookup. (set if -d option is set)
- */
- char *idna_name;
- /**
- * DNS compatibility (name is given as DNS name, possible IDNA).
- */
- static int dns_compat;
- /**
- * record type to look up (-t option)
- */
- static char *lookup_type;
- /**
- * raw output
- */
- static int raw;
- /**
- * Desired record type.
- */
- static uint32_t rtype;
- /**
- * Timeout for lookup
- */
- static struct GNUNET_TIME_Relative timeout;
- /**
- * Timeout task
- */
- static struct GNUNET_SCHEDULER_Task *to_task;
- /**
- * Handle to lookup request
- */
- static struct GNUNET_GNS_LookupWithTldRequest *lr;
- /**
- * Global return value.
- * 0 on success (default),
- * 1 on internal failures
- * 2 on launch failure,
- * 4 if the name is not a GNS-supported TLD,
- */
- static int global_ret;
- /**
- * Task run on shutdown. Cleans up everything.
- *
- * @param cls unused
- */
- static void
- do_shutdown (void *cls)
- {
- (void) cls;
- if (NULL != to_task)
- {
- GNUNET_SCHEDULER_cancel (to_task);
- to_task = NULL;
- }
- if (NULL != lr)
- {
- GNUNET_GNS_lookup_with_tld_cancel (lr);
- lr = NULL;
- }
- if (NULL != gns)
- {
- GNUNET_GNS_disconnect (gns);
- gns = NULL;
- }
- if (NULL != idna_name)
- {
- GNUNET_free (idna_name);
- idna_name = NULL;
- }
- }
- /**
- * Task to run on timeout
- *
- * @param cls unused
- */
- static void
- do_timeout (void*cls)
- {
- to_task = NULL;
- global_ret = 3; // Timeout
- GNUNET_SCHEDULER_shutdown ();
- }
- /**
- * Function called with the result of a GNS lookup.
- *
- * @param cls the 'const char *' name that was resolved
- * @param was_gns #GNUNET_NO if TLD did not indicate use of GNS
- * @param rd_count number of records returned
- * @param rd array of @a rd_count records with the results
- */
- static void
- process_lookup_result (void *cls,
- int was_gns,
- uint32_t rd_count,
- const struct GNUNET_GNSRECORD_Data *rd)
- {
- const char *name = cls;
- const char *typename;
- char *string_val;
- lr = NULL;
- if (GNUNET_NO == was_gns)
- {
- global_ret = 4; /* not for GNS */
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- if (! raw)
- {
- if (0 == rd_count)
- printf ("No results.\n");
- else
- printf ("%s:\n", name);
- }
- for (uint32_t i = 0; i < rd_count; i++)
- {
- if ((rd[i].record_type != rtype) && (GNUNET_GNSRECORD_TYPE_ANY != rtype))
- continue;
- typename = GNUNET_GNSRECORD_number_to_typename (rd[i].record_type);
- string_val = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
- rd[i].data,
- rd[i].data_size);
- if (NULL == string_val)
- {
- fprintf (stderr,
- "Record %u of type %d malformed, skipping\n",
- (unsigned int) i,
- (int) rd[i].record_type);
- continue;
- }
- if (raw)
- printf ("%s\n", string_val);
- else
- printf ("Got `%s' record: %s%s\n",
- typename,
- string_val,
- (0 != (rd[i].flags & GNUNET_GNSRECORD_RF_SUPPLEMENTAL)) ?
- " (supplemental)" : "");
- GNUNET_free (string_val);
- }
- GNUNET_SCHEDULER_shutdown ();
- }
- /**
- * Main function that will be run.
- *
- * @param cls closure
- * @param args remaining command-line arguments
- * @param cfgfile name of the configuration file used (for saving, can be NULL!)
- * @param c configuration
- */
- static void
- run (void *cls,
- char *const *args,
- const char *cfgfile,
- const struct GNUNET_CONFIGURATION_Handle *c)
- {
- (void) cls;
- (void) args;
- (void) cfgfile;
- cfg = c;
- to_task = NULL;
- {
- char *colon;
- if (NULL != (colon = strchr (lookup_name, ':')))
- *colon = '\0';
- }
- /**
- * If DNS compatibility is requested, we first verify that the
- * lookup_name is in a DNS format. If yes, we convert it to UTF-8.
- */
- if (GNUNET_YES == dns_compat)
- {
- Idna_rc rc;
- if (GNUNET_OK != GNUNET_DNSPARSER_check_name (lookup_name))
- {
- fprintf (stderr,
- _ ("`%s' is not a valid DNS domain name\n"),
- lookup_name);
- global_ret = 3;
- return;
- }
- if (IDNA_SUCCESS !=
- (rc = idna_to_unicode_8z8z (lookup_name, &idna_name,
- IDNA_ALLOW_UNASSIGNED)))
- {
- fprintf (stderr,
- _ ("Failed to convert DNS IDNA name `%s' to UTF-8: %s\n"),
- lookup_name,
- idna_strerror (rc));
- global_ret = 4;
- return;
- }
- lookup_name = idna_name;
- }
- if (GNUNET_YES !=
- GNUNET_CLIENT_test (cfg,
- "arm"))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _ ("Cannot resolve using GNS: GNUnet peer not running\n"));
- global_ret = 5;
- return;
- }
- to_task = GNUNET_SCHEDULER_add_delayed (timeout,
- &do_timeout,
- NULL);
- gns = GNUNET_GNS_connect (cfg);
- if (NULL == gns)
- {
- fprintf (stderr,
- _ ("Failed to connect to GNS\n"));
- global_ret = 2;
- return;
- }
- GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
- NULL);
- if (NULL != lookup_type)
- rtype = GNUNET_GNSRECORD_typename_to_number (lookup_type);
- else
- rtype = GNUNET_DNSPARSER_TYPE_A;
- if (UINT32_MAX == rtype)
- {
- fprintf (stderr,
- _ ("Invalid typename specified, assuming `ANY'\n"));
- rtype = GNUNET_GNSRECORD_TYPE_ANY;
- }
- lr = GNUNET_GNS_lookup_with_tld (gns,
- lookup_name,
- rtype,
- GNUNET_GNS_LO_DEFAULT,
- &process_lookup_result,
- lookup_name);
- if (NULL == lr)
- {
- global_ret = 2;
- GNUNET_SCHEDULER_shutdown ();
- return;
- }
- }
- /**
- * The main function for gnunet-gns.
- *
- * @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)
- {
- timeout = GNUNET_TIME_UNIT_FOREVER_REL;
- struct GNUNET_GETOPT_CommandLineOption options[] =
- { GNUNET_GETOPT_option_mandatory (
- GNUNET_GETOPT_option_string ('u',
- "lookup",
- "NAME",
- gettext_noop (
- "Lookup a record for the given name"),
- &lookup_name)),
- GNUNET_GETOPT_option_string ('t',
- "type",
- "TYPE",
- gettext_noop (
- "Specify the type of the record to lookup"),
- &lookup_type),
- GNUNET_GETOPT_option_relative_time ('T',
- "timeout",
- "TIMEOUT",
- gettext_noop (
- "Specify a timeout for the lookup"),
- &timeout),
- GNUNET_GETOPT_option_flag ('r',
- "raw",
- gettext_noop ("No unneeded output"),
- &raw),
- GNUNET_GETOPT_option_flag ('d',
- "dns",
- gettext_noop (
- "DNS Compatibility: Name is passed in IDNA instead of UTF-8"),
- &dns_compat),
- GNUNET_GETOPT_OPTION_END };
- int ret;
- if (GNUNET_OK !=
- GNUNET_STRINGS_get_utf8_args (argc, argv,
- &argc, &argv))
- return 2;
- GNUNET_log_setup ("gnunet-gns", "WARNING", NULL);
- ret = GNUNET_PROGRAM_run (argc,
- argv,
- "gnunet-gns",
- _ ("GNUnet GNS resolver tool"),
- options,
- &run,
- NULL);
- GNUNET_free_nz ((void *) argv);
- if (GNUNET_OK != ret)
- return 1;
- return global_ret;
- }
- /* end of gnunet-gns.c */
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