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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* This program 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 2, or (at your option)
* any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright (C) 2010 Red Hat, Inc.
*
*/
#include "config.h"
#include <arpa/inet.h>
#include <string.h>
#include "nm-dns-utils.h"
#include "nm-platform.h"
#include "nm-utils.h"
static void
add_ip4_to_rdns_array (guint32 ip, GPtrArray *domains) /* network byte order */
{
guint32 defprefix;
guchar *p;
char *str = NULL;
int i;
defprefix = nm_utils_ip4_get_default_prefix (ip);
/* Convert to host byte order, mask the host bits, and convert back */
ip = ntohl (ip);
ip &= 0xFFFFFFFF << (32 - defprefix);
ip = htonl (ip);
p = (guchar *) &ip;
if (defprefix == 8)
str = g_strdup_printf ("%u.in-addr.arpa", p[0] & 0xFF);
else if (defprefix == 16)
str = g_strdup_printf ("%u.%u.in-addr.arpa", p[1] & 0xFF, p[0] & 0xFF);
else if (defprefix == 24)
str = g_strdup_printf ("%u.%u.%u.in-addr.arpa", p[2] & 0xFF, p[1] & 0xFF, p[0] & 0xFF);
if (!str) {
g_return_if_fail (str != NULL);
return;
}
/* Suppress duplicates */
for (i = 0; i < domains->len; i++) {
if (strcmp (str, g_ptr_array_index (domains, i)) == 0)
break;
}
if (i == domains->len)
g_ptr_array_add (domains, str);
else
g_free (str);
}
char **
nm_dns_utils_get_ip4_rdns_domains (NMIP4Config *ip4)
{
GPtrArray *domains = NULL;
int i;
g_return_val_if_fail (ip4 != NULL, NULL);
domains = g_ptr_array_sized_new (5);
/* To calculate the reverse DNS domains for this IP4 config, we take
* all the IP addresses and routes in the config, calculate the network
* portion, and convert that to classful, and use the network bits for
* the final domain. FIXME: better handle classless routing, which might
* require us to add multiple domains for each actual network prefix to
* cover all the separate networks in that block.
*/
for (i = 0; i < nm_ip4_config_get_num_addresses (ip4); i++) {
const NMPlatformIP4Address *address = nm_ip4_config_get_address (ip4, i);
add_ip4_to_rdns_array (address->address, domains);
}
for (i = 0; i < nm_ip4_config_get_num_routes (ip4); i++) {
const NMPlatformIP4Route *route = nm_ip4_config_get_route (ip4, i);
add_ip4_to_rdns_array (route->network, domains);
}
/* Terminating NULL so we can use g_strfreev() to free it */
g_ptr_array_add (domains, NULL);
/* Free the array and return NULL if the only element was the ending NULL */
return (char **) g_ptr_array_free (domains, (domains->len == 1));
}
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