domain_helper.h

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/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2025 Lev Stipakov <lev@openvpn.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  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.
 */
 
static inline bool
is_allowed_domain_ascii(unsigned char c)
{
    return (c >= 'A' && c <= 'Z')
           || (c >= 'a' && c <= 'z')
           || (c >= '0' && c <= '9')
           || c == '.' || c == '-' || c == '_' || c >= 0x80;
}
 
static inline bool
validate_domain(const char *domain)
{
    for (const char *ch = domain; *ch; ++ch)
    {
        if (!is_allowed_domain_ascii((unsigned char)*ch))
        {
            return false;
        }
    }
 
    return true;
}