ocserv/src/valid-hostname.c

/*
 * Copyright (C) 2016 Nikos Mavrogiannopoulos
 *
 * This file is part of ocserv.
 *
 * ocserv 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 of the License, or
 * (at your option) any later version.
 *
 * ocserv 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, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <c-strcase.h>
#include <c-ctype.h>

unsigned valid_hostname(const char *host)
{
	const char *p;

	p = host;

	if (*p == '-')
		return 0;

	while(*p != 0) {
		if (!(c_isalnum(*p)) && !(*p == '-'))
			return 0;
		p++;
	}
	return 1;
}