diff options
Diffstat (limited to 'src/dns-manager/nm-dns-utils.c')
| -rw-r--r-- | src/dns-manager/nm-dns-utils.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/dns-manager/nm-dns-utils.c b/src/dns-manager/nm-dns-utils.c new file mode 100644 index 00000000..615adfd1 --- /dev/null +++ b/src/dns-manager/nm-dns-utils.c @@ -0,0 +1,99 @@ +/* -*- 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 <arpa/inet.h> +#include <string.h> + +#include "nm-dns-utils.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); + + g_return_if_fail (str != NULL); + + /* 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++) { + NMIP4Address *addr = nm_ip4_config_get_address (ip4, i); + + add_ip4_to_rdns_array (nm_ip4_address_get_address (addr), domains); + } + + for (i = 0; i < nm_ip4_config_get_num_routes (ip4); i++) { + NMIP4Route *route = nm_ip4_config_get_route (ip4, i); + + add_ip4_to_rdns_array (nm_ip4_route_get_dest (route), 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)); +} + |