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/*
* Copyright (c) 2002-2015 Balabit
* Copyright (c) 1998-2015 Balázs Scheidler
*
* 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.
*
*/
#include "hostname.h"
#include "cfg.h"
#include "gsockaddr.h"
#include "messages.h"
#include "dnscache.h"
#include <unistd.h>
#include <arpa/inet.h>
#include <string.h>
static gchar local_hostname_fqdn[256];
static gchar local_hostname_short[256];
static gchar local_domain[256];
static gboolean local_domain_overridden;
static gchar *
get_local_hostname_from_system(void)
{
gchar hostname[256];
gethostname(hostname, sizeof(hostname) - 1);
hostname[sizeof(hostname) - 1] = '\0';
return g_strdup(hostname);
}
static gboolean
is_hostname_fqdn(const gchar *hostname)
{
return strchr(hostname, '.') != NULL;
}
static const gchar *
extract_domain_from_fqdn(const gchar *hostname)
{
const gchar *dot = strchr(hostname, '.');
if (dot)
return dot + 1;
return NULL;
}
#include "hostname-unix.c"
static void
validate_hostname_cache(void)
{
g_assert(local_hostname_fqdn[0] != 0);
}
const gchar *
get_local_hostname_fqdn(void)
{
validate_hostname_cache();
return local_hostname_fqdn;
}
const gchar *
get_local_hostname_short(void)
{
validate_hostname_cache();
return local_hostname_short;
}
gchar *
convert_hostname_to_fqdn(gchar *hostname, gsize hostname_len)
{
gchar *end;
/* we only change the hostname if domain_override is set. If it is unset,
* our best guess is what we got as input. */
if (local_domain_overridden)
convert_hostname_to_short_hostname(hostname, hostname_len);
if (local_domain_overridden ||
(!is_hostname_fqdn(hostname) && local_domain[0]))
{
end = hostname + strlen(hostname);
if (end < hostname + hostname_len)
{
*end = '.';
end++;
}
strncpy(end, local_domain, hostname_len - (end - hostname));
hostname[hostname_len - 1] = 0;
}
return hostname;
}
gchar *
convert_hostname_to_short_hostname(gchar *hostname, gsize hostname_len)
{
gchar *p;
p = strchr(hostname, '.');
if (p)
*p = '\0';
return hostname;
}
static void
detect_local_fqdn_hostname(void)
{
gchar *hostname;
hostname = get_local_hostname_from_system();
if (!is_hostname_fqdn(hostname))
{
/* not fully qualified, resolve it using DNS or /etc/hosts */
g_free(hostname);
hostname = get_local_fqdn_hostname_from_dns();
if (!hostname)
{
msg_verbose("Unable to detect fully qualified hostname for localhost, use_fqdn() will use the short hostname");
hostname = get_local_hostname_from_system();
if (!hostname[0])
{
msg_error("Could not resolve local hostname either from the DNS nor gethostname(), assuming localhost");
hostname = g_strdup("localhost");
}
}
}
g_strlcpy(local_hostname_fqdn, hostname, sizeof(local_hostname_fqdn));
g_free(hostname);
}
static void
detect_local_domain(void)
{
const gchar *domain = extract_domain_from_fqdn(local_hostname_fqdn);
if (domain)
g_strlcpy(local_domain, domain, sizeof(local_domain));
else
local_domain[0] = 0;
}
static void
detect_local_short_hostname(void)
{
g_strlcpy(local_hostname_short, local_hostname_fqdn, sizeof(local_hostname_short));
convert_hostname_to_short_hostname(local_hostname_short, sizeof(local_hostname_short));
}
static void
set_domain_override(const gchar *domain_override)
{
if (domain_override)
{
g_strlcpy(local_domain, domain_override, sizeof(local_domain));
local_domain_overridden = TRUE;
}
else
local_domain_overridden = FALSE;
convert_hostname_to_fqdn(local_hostname_fqdn, sizeof(local_hostname_fqdn));
}
void
hostname_reinit(const gchar *domain_override)
{
detect_local_fqdn_hostname();
detect_local_domain();
detect_local_short_hostname();
set_domain_override(domain_override);
}
void
hostname_global_init(void)
{
hostname_reinit(NULL);
}
void
hostname_global_deinit(void)
{
}
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