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/*
* Copyright (c) 2002-2013 Balabit
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
/* NOTE: this file is included directly into hostname.c so the set of
* includes here only add system dependent headers and not the full set
*/
#include <netdb.h>
static struct hostent *
_resolve_localhost_from_dns(void)
{
gchar *local_host;
struct hostent *host;
local_host = get_local_hostname_from_system();
host = gethostbyname(local_host);
g_free(local_host);
return host;
}
static const gchar *
_extract_fqdn_from_hostent(struct hostent *host)
{
gint i;
if (is_hostname_fqdn(host->h_name))
return host->h_name;
for (i = 0; host->h_aliases[i]; i++)
{
if (is_hostname_fqdn(host->h_aliases[i]))
return host->h_aliases[i];
}
return NULL;
}
/*
* NOTE: this function is not thread safe because it uses the non-reentrant
* resolver functions. This is not a problem as it is only called once
* during initialization when a single thread is active.
*/
gchar *
get_local_fqdn_hostname_from_dns(void)
{
struct hostent *hostent;
hostent = _resolve_localhost_from_dns();
if (hostent)
return g_strdup(_extract_fqdn_from_hostent(hostent));
return NULL;
}
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