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666374c16f
* Add resolver functions for looking up DNS records of various types. Currently implemented: MX, TXT, SOA, SRV, NS * Return records as GVariant tuples. * Make the GSrvTarget lookups a wrapper over this new functionality. * Rework the resolver test so that it has support for looking up MX, NS, SOA, TXT records, and uses GOptionContext https://bugzilla.gnome.org/show_bug.cgi?id=672944
747 lines
18 KiB
C
747 lines
18 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2008 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include "glibintl.h"
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <gio/gio.h>
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static GResolver *resolver;
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static GCancellable *cancellable;
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static GMainLoop *loop;
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static int nlookups = 0;
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static gboolean synchronous = FALSE;
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static guint connectable_count = 0;
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static GResolverRecordType record_type = 0;
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static void G_GNUC_NORETURN
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usage (void)
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{
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fprintf (stderr, "Usage: resolver [-s] [hostname | IP | service/protocol/domain ] ...\n");
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fprintf (stderr, "Usage: resolver [-s] [-t MX|TXT|NS|SOA] rrname ...\n");
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fprintf (stderr, " resolver [-s] -c NUMBER [hostname | IP | service/protocol/domain ]\n");
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fprintf (stderr, " Use -s to do synchronous lookups.\n");
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fprintf (stderr, " Use -c NUMBER (and only a single resolvable argument) to test GSocketConnectable.\n");
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fprintf (stderr, " The given NUMBER determines how many times the connectable will be enumerated.\n");
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fprintf (stderr, " Use -t with MX, TXT, NS or SOA to lookup DNS records of those types.\n");
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exit (1);
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}
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G_LOCK_DEFINE_STATIC (response);
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static void
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done_lookup (void)
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{
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nlookups--;
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if (nlookups == 0)
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{
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/* In the sync case we need to make sure we don't call
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* g_main_loop_quit before the loop is actually running...
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*/
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g_idle_add ((GSourceFunc)g_main_loop_quit, loop);
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}
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}
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static void
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print_resolved_name (const char *phys,
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char *name,
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GError *error)
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{
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G_LOCK (response);
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printf ("Address: %s\n", phys);
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if (error)
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{
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printf ("Error: %s\n", error->message);
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g_error_free (error);
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}
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else
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{
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printf ("Name: %s\n", name);
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g_free (name);
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}
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printf ("\n");
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done_lookup ();
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G_UNLOCK (response);
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}
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static void
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print_resolved_addresses (const char *name,
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GList *addresses,
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GError *error)
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{
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char *phys;
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GList *a;
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G_LOCK (response);
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printf ("Name: %s\n", name);
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if (error)
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{
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printf ("Error: %s\n", error->message);
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g_error_free (error);
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}
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else
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{
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for (a = addresses; a; a = a->next)
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{
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phys = g_inet_address_to_string (a->data);
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printf ("Address: %s\n", phys);
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g_free (phys);
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g_object_unref (a->data);
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}
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g_list_free (addresses);
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}
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printf ("\n");
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done_lookup ();
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G_UNLOCK (response);
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}
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static void
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print_resolved_service (const char *service,
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GList *targets,
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GError *error)
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{
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GList *t;
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G_LOCK (response);
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printf ("Service: %s\n", service);
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if (error)
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{
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printf ("Error: %s\n", error->message);
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g_error_free (error);
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}
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else
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{
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for (t = targets; t; t = t->next)
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{
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printf ("%s:%u (pri %u, weight %u)\n",
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g_srv_target_get_hostname (t->data),
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(guint)g_srv_target_get_port (t->data),
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(guint)g_srv_target_get_priority (t->data),
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(guint)g_srv_target_get_weight (t->data));
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g_srv_target_free (t->data);
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}
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g_list_free (targets);
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}
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printf ("\n");
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done_lookup ();
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G_UNLOCK (response);
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}
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static void
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print_resolved_mx (const char *rrname,
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GList *records,
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GError *error)
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{
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const gchar *hostname;
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guint16 priority;
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GList *t;
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G_LOCK (response);
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printf ("Domain: %s\n", rrname);
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if (error)
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{
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printf ("Error: %s\n", error->message);
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g_error_free (error);
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}
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else if (!records)
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{
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printf ("no MX records\n");
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}
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else
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{
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for (t = records; t; t = t->next)
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{
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g_variant_get (t->data, "(q&s)", &priority, &hostname);
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printf ("%s (pri %u)\n", hostname, (guint)priority);
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g_variant_unref (t->data);
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}
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g_list_free (records);
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}
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printf ("\n");
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done_lookup ();
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G_UNLOCK (response);
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}
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static void
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print_resolved_txt (const char *rrname,
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GList *records,
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GError *error)
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{
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const gchar **contents;
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GList *t;
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gint i;
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G_LOCK (response);
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printf ("Domain: %s\n", rrname);
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if (error)
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{
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printf ("Error: %s\n", error->message);
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g_error_free (error);
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}
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else if (!records)
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{
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printf ("no TXT records\n");
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}
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else
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{
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for (t = records; t; t = t->next)
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{
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if (t != records)
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printf ("\n");
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g_variant_get (t->data, "(^a&s)", &contents);
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for (i = 0; contents[i] != NULL; i++)
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printf ("%s\n", contents[i]);
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g_variant_unref (t->data);
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}
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g_list_free (records);
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}
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printf ("\n");
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done_lookup ();
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G_UNLOCK (response);
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}
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static void
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print_resolved_soa (const char *rrname,
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GList *records,
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GError *error)
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{
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GList *t;
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const gchar *primary_ns;
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const gchar *administrator;
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guint32 serial, refresh, retry, expire, ttl;
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G_LOCK (response);
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printf ("Zone: %s\n", rrname);
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if (error)
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{
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printf ("Error: %s\n", error->message);
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g_error_free (error);
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}
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else if (!records)
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{
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printf ("no SOA records\n");
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}
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else
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{
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for (t = records; t; t = t->next)
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{
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g_variant_get (t->data, "(&s&suuuuu)", &primary_ns, &administrator,
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&serial, &refresh, &retry, &expire, &ttl);
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printf ("%s %s (serial %u, refresh %u, retry %u, expire %u, ttl %u)\n",
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primary_ns, administrator, (guint)serial, (guint)refresh,
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(guint)retry, (guint)expire, (guint)ttl);
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g_variant_unref (t->data);
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}
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g_list_free (records);
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}
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printf ("\n");
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done_lookup ();
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G_UNLOCK (response);
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}
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static void
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print_resolved_ns (const char *rrname,
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GList *records,
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GError *error)
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{
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GList *t;
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const gchar *hostname;
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G_LOCK (response);
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printf ("Zone: %s\n", rrname);
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if (error)
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{
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printf ("Error: %s\n", error->message);
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g_error_free (error);
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}
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else if (!records)
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{
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printf ("no NS records\n");
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}
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else
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{
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for (t = records; t; t = t->next)
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{
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g_variant_get (t->data, "(&s)", &hostname);
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printf ("%s\n", hostname);
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g_variant_unref (t->data);
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}
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g_list_free (records);
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}
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printf ("\n");
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done_lookup ();
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G_UNLOCK (response);
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}
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static void
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lookup_one_sync (const char *arg)
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{
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GError *error = NULL;
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if (record_type != 0)
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{
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GList *records;
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records = g_resolver_lookup_records (resolver, arg, record_type, cancellable, &error);
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switch (record_type)
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{
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case G_RESOLVER_RECORD_MX:
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print_resolved_mx (arg, records, error);
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break;
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case G_RESOLVER_RECORD_SOA:
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print_resolved_soa (arg, records, error);
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break;
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case G_RESOLVER_RECORD_NS:
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print_resolved_ns (arg, records, error);
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break;
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case G_RESOLVER_RECORD_TXT:
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print_resolved_txt (arg, records, error);
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break;
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default:
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g_warn_if_reached ();
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break;
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}
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}
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else if (strchr (arg, '/'))
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{
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GList *targets;
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/* service/protocol/domain */
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char **parts = g_strsplit (arg, "/", 3);
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if (!parts || !parts[2])
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usage ();
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targets = g_resolver_lookup_service (resolver,
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parts[0], parts[1], parts[2],
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cancellable, &error);
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print_resolved_service (arg, targets, error);
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}
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else if (g_hostname_is_ip_address (arg))
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{
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GInetAddress *addr = g_inet_address_new_from_string (arg);
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char *name;
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name = g_resolver_lookup_by_address (resolver, addr, cancellable, &error);
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print_resolved_name (arg, name, error);
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g_object_unref (addr);
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}
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else
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{
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GList *addresses;
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addresses = g_resolver_lookup_by_name (resolver, arg, cancellable, &error);
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print_resolved_addresses (arg, addresses, error);
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}
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}
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static gpointer
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lookup_thread (gpointer arg)
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{
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lookup_one_sync (arg);
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return NULL;
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}
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static void
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start_sync_lookups (char **argv, int argc)
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{
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int i;
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for (i = 0; i < argc; i++)
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{
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GThread *thread;
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thread = g_thread_new ("lookup", lookup_thread, argv[i]);
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g_thread_unref (thread);
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}
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}
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static void
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lookup_by_addr_callback (GObject *source, GAsyncResult *result,
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gpointer user_data)
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{
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const char *phys = user_data;
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GError *error = NULL;
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char *name;
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name = g_resolver_lookup_by_address_finish (resolver, result, &error);
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print_resolved_name (phys, name, error);
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}
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static void
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lookup_by_name_callback (GObject *source, GAsyncResult *result,
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gpointer user_data)
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{
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const char *name = user_data;
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GError *error = NULL;
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GList *addresses;
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addresses = g_resolver_lookup_by_name_finish (resolver, result, &error);
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print_resolved_addresses (name, addresses, error);
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}
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static void
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lookup_service_callback (GObject *source, GAsyncResult *result,
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gpointer user_data)
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{
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const char *service = user_data;
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GError *error = NULL;
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GList *targets;
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targets = g_resolver_lookup_service_finish (resolver, result, &error);
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print_resolved_service (service, targets, error);
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}
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static void
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lookup_records_callback (GObject *source,
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GAsyncResult *result,
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gpointer user_data)
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{
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const char *arg = user_data;
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GError *error = NULL;
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GList *records;
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records = g_resolver_lookup_records_finish (resolver, result, &error);
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switch (record_type)
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{
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case G_RESOLVER_RECORD_MX:
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print_resolved_mx (arg, records, error);
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break;
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case G_RESOLVER_RECORD_SOA:
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print_resolved_soa (arg, records, error);
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break;
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case G_RESOLVER_RECORD_NS:
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print_resolved_ns (arg, records, error);
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break;
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case G_RESOLVER_RECORD_TXT:
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print_resolved_txt (arg, records, error);
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break;
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default:
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g_warn_if_reached ();
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break;
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}
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}
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static void
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start_async_lookups (char **argv, int argc)
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{
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int i;
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for (i = 0; i < argc; i++)
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{
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if (record_type != 0)
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{
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g_resolver_lookup_records_async (resolver, argv[i], record_type,
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cancellable, lookup_records_callback, argv[i]);
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}
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else if (strchr (argv[i], '/'))
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{
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/* service/protocol/domain */
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char **parts = g_strsplit (argv[i], "/", 3);
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if (!parts || !parts[2])
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usage ();
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g_resolver_lookup_service_async (resolver,
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parts[0], parts[1], parts[2],
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cancellable,
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lookup_service_callback, argv[i]);
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}
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else if (g_hostname_is_ip_address (argv[i]))
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{
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GInetAddress *addr = g_inet_address_new_from_string (argv[i]);
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g_resolver_lookup_by_address_async (resolver, addr, cancellable,
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lookup_by_addr_callback, argv[i]);
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g_object_unref (addr);
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}
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else
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{
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g_resolver_lookup_by_name_async (resolver, argv[i], cancellable,
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lookup_by_name_callback,
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argv[i]);
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}
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/* Stress-test the reloading code */
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g_signal_emit_by_name (resolver, "reload");
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}
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}
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static void
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print_connectable_sockaddr (GSocketAddress *sockaddr,
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GError *error)
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{
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char *phys;
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if (error)
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{
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printf ("Error: %s\n", error->message);
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g_error_free (error);
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}
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else if (!G_IS_INET_SOCKET_ADDRESS (sockaddr))
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{
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printf ("Error: Unexpected sockaddr type '%s'\n", g_type_name_from_instance ((GTypeInstance *)sockaddr));
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g_object_unref (sockaddr);
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}
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else
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{
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GInetSocketAddress *isa = G_INET_SOCKET_ADDRESS (sockaddr);
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phys = g_inet_address_to_string (g_inet_socket_address_get_address (isa));
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printf ("Address: %s%s%s:%d\n",
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strchr (phys, ':') ? "[" : "", phys, strchr (phys, ':') ? "]" : "",
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g_inet_socket_address_get_port (isa));
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g_free (phys);
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g_object_unref (sockaddr);
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}
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}
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|
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static void
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do_sync_connectable (GSocketAddressEnumerator *enumerator)
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{
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GSocketAddress *sockaddr;
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GError *error = NULL;
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while ((sockaddr = g_socket_address_enumerator_next (enumerator, cancellable, &error)))
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print_connectable_sockaddr (sockaddr, error);
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g_object_unref (enumerator);
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done_lookup ();
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}
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|
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static void do_async_connectable (GSocketAddressEnumerator *enumerator);
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|
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static void
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got_next_async (GObject *source, GAsyncResult *result, gpointer user_data)
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{
|
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GSocketAddressEnumerator *enumerator = G_SOCKET_ADDRESS_ENUMERATOR (source);
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|
GSocketAddress *sockaddr;
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GError *error = NULL;
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|
|
sockaddr = g_socket_address_enumerator_next_finish (enumerator, result, &error);
|
|
if (sockaddr || error)
|
|
print_connectable_sockaddr (sockaddr, error);
|
|
if (sockaddr)
|
|
do_async_connectable (enumerator);
|
|
else
|
|
{
|
|
g_object_unref (enumerator);
|
|
done_lookup ();
|
|
}
|
|
}
|
|
|
|
static void
|
|
do_async_connectable (GSocketAddressEnumerator *enumerator)
|
|
{
|
|
g_socket_address_enumerator_next_async (enumerator, cancellable,
|
|
got_next_async, NULL);
|
|
}
|
|
|
|
static void
|
|
do_connectable (const char *arg, gboolean synchronous, guint count)
|
|
{
|
|
char **parts;
|
|
GSocketConnectable *connectable;
|
|
GSocketAddressEnumerator *enumerator;
|
|
|
|
if (strchr (arg, '/'))
|
|
{
|
|
/* service/protocol/domain */
|
|
parts = g_strsplit (arg, "/", 3);
|
|
if (!parts || !parts[2])
|
|
usage ();
|
|
|
|
connectable = g_network_service_new (parts[0], parts[1], parts[2]);
|
|
}
|
|
else
|
|
{
|
|
guint16 port;
|
|
|
|
parts = g_strsplit (arg, ":", 2);
|
|
if (parts && parts[1])
|
|
{
|
|
arg = parts[0];
|
|
port = strtoul (parts[1], NULL, 10);
|
|
}
|
|
else
|
|
port = 0;
|
|
|
|
if (g_hostname_is_ip_address (arg))
|
|
{
|
|
GInetAddress *addr = g_inet_address_new_from_string (arg);
|
|
GSocketAddress *sockaddr = g_inet_socket_address_new (addr, port);
|
|
|
|
g_object_unref (addr);
|
|
connectable = G_SOCKET_CONNECTABLE (sockaddr);
|
|
}
|
|
else
|
|
connectable = g_network_address_new (arg, port);
|
|
}
|
|
|
|
while (count--)
|
|
{
|
|
enumerator = g_socket_connectable_enumerate (connectable);
|
|
|
|
if (synchronous)
|
|
do_sync_connectable (enumerator);
|
|
else
|
|
do_async_connectable (enumerator);
|
|
}
|
|
|
|
g_object_unref (connectable);
|
|
}
|
|
|
|
#ifdef G_OS_UNIX
|
|
static int cancel_fds[2];
|
|
|
|
static void
|
|
interrupted (int sig)
|
|
{
|
|
gssize c;
|
|
|
|
signal (SIGINT, SIG_DFL);
|
|
c = write (cancel_fds[1], "x", 1);
|
|
g_assert_cmpint(c, ==, 1);
|
|
}
|
|
|
|
static gboolean
|
|
async_cancel (GIOChannel *source, GIOCondition cond, gpointer cancel)
|
|
{
|
|
g_cancellable_cancel (cancel);
|
|
return FALSE;
|
|
}
|
|
#endif
|
|
|
|
|
|
static gboolean
|
|
record_type_arg (const gchar *option_name,
|
|
const gchar *value,
|
|
gpointer data,
|
|
GError **error)
|
|
{
|
|
if (g_ascii_strcasecmp (value, "MX") == 0) {
|
|
record_type = G_RESOLVER_RECORD_MX;
|
|
} else if (g_ascii_strcasecmp (value, "TXT") == 0) {
|
|
record_type = G_RESOLVER_RECORD_TXT;
|
|
} else if (g_ascii_strcasecmp (value, "SOA") == 0) {
|
|
record_type = G_RESOLVER_RECORD_SOA;
|
|
} else if (g_ascii_strcasecmp (value, "NS") == 0) {
|
|
record_type = G_RESOLVER_RECORD_NS;
|
|
} else {
|
|
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
|
|
"Specify MX, TXT, NS or SOA for the special record lookup types");
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static const GOptionEntry option_entries[] = {
|
|
{ "synchronous", 's', 0, G_OPTION_ARG_NONE, &synchronous, "Synchronous connections", NULL },
|
|
{ "connectable", 'c', 0, G_OPTION_ARG_INT, &connectable_count, "Connectable count", "C" },
|
|
{ "special-type", 't', 0, G_OPTION_ARG_CALLBACK, record_type_arg, "Record type like MX, TXT, NS or SOA", "RR" },
|
|
{ NULL },
|
|
};
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
GOptionContext *context;
|
|
GError *error = NULL;
|
|
#ifdef G_OS_UNIX
|
|
GIOChannel *chan;
|
|
guint watch;
|
|
#endif
|
|
|
|
g_type_init ();
|
|
|
|
context = g_option_context_new ("lookups ...");
|
|
g_option_context_add_main_entries (context, option_entries, NULL);
|
|
if (!g_option_context_parse (context, &argc, &argv, &error))
|
|
{
|
|
g_printerr ("%s\n", error->message);
|
|
g_error_free (error);
|
|
usage();
|
|
}
|
|
|
|
if (argc < 2 || (argc > 2 && connectable_count))
|
|
usage ();
|
|
|
|
resolver = g_resolver_get_default ();
|
|
|
|
cancellable = g_cancellable_new ();
|
|
|
|
#ifdef G_OS_UNIX
|
|
/* Set up cancellation; we want to cancel if the user ^C's the
|
|
* program, but we can't cancel directly from an interrupt.
|
|
*/
|
|
signal (SIGINT, interrupted);
|
|
|
|
if (pipe (cancel_fds) == -1)
|
|
{
|
|
perror ("pipe");
|
|
exit (1);
|
|
}
|
|
chan = g_io_channel_unix_new (cancel_fds[0]);
|
|
watch = g_io_add_watch (chan, G_IO_IN, async_cancel, cancellable);
|
|
g_io_channel_unref (chan);
|
|
#endif
|
|
|
|
nlookups = argc - 1;
|
|
loop = g_main_loop_new (NULL, TRUE);
|
|
|
|
if (connectable_count)
|
|
{
|
|
nlookups = connectable_count;
|
|
do_connectable (argv[1], synchronous, connectable_count);
|
|
}
|
|
else
|
|
{
|
|
if (synchronous)
|
|
start_sync_lookups (argv + 1, argc - 1);
|
|
else
|
|
start_async_lookups (argv + 1, argc - 1);
|
|
}
|
|
|
|
g_main_loop_run (loop);
|
|
g_main_loop_unref (loop);
|
|
|
|
#ifdef G_OS_UNIX
|
|
g_source_remove (watch);
|
|
#endif
|
|
g_object_unref (cancellable);
|
|
|
|
return 0;
|
|
}
|