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88 lines
2.7 KiB
Rust
88 lines
2.7 KiB
Rust
/* Copyright (C) 2020 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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//! Utility module.
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use std::ffi::CStr;
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use std::os::raw::c_char;
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use nom7::bytes::complete::take_while1;
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use nom7::character::complete::char;
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use nom7::character::{is_alphabetic, is_alphanumeric};
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use nom7::combinator::verify;
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use nom7::multi::many1_count;
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use nom7::IResult;
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#[no_mangle]
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pub unsafe extern "C" fn rs_check_utf8(val: *const c_char) -> bool {
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CStr::from_ptr(val).to_str().is_ok()
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}
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fn is_alphanumeric_or_hyphen(chr: u8) -> bool {
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return is_alphanumeric(chr) || chr == b'-';
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}
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fn parse_domain_label(i: &[u8]) -> IResult<&[u8], ()> {
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let (i, _) = verify(take_while1(is_alphanumeric_or_hyphen), |x: &[u8]| {
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is_alphabetic(x[0]) && x[x.len() - 1] != b'-'
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})(i)?;
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return Ok((i, ()));
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}
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fn parse_subdomain(input: &[u8]) -> IResult<&[u8], ()> {
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let (input, _) = parse_domain_label(input)?;
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let (input, _) = char('.')(input)?;
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return Ok((input, ()));
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}
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fn parse_domain(input: &[u8]) -> IResult<&[u8], ()> {
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let (input, _) = many1_count(parse_subdomain)(input)?;
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let (input, _) = parse_domain_label(input)?;
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return Ok((input, ()));
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}
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#[no_mangle]
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pub unsafe extern "C" fn SCValidateDomain(input: *const u8, in_len: u32) -> u32 {
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let islice = build_slice!(input, in_len as usize);
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if let Ok((rem, _)) = parse_domain(islice) {
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return (islice.len() - rem.len()) as u32;
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}
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return 0;
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_parse_domain() {
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let buf0: &[u8] = "a-1.oisf.net more".as_bytes();
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let (rem, _) = parse_domain(buf0).unwrap();
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// And we should have 5 bytes left.
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assert_eq!(rem.len(), 5);
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let buf1: &[u8] = "justatext".as_bytes();
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assert!(parse_domain(buf1).is_err());
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let buf1: &[u8] = "1.com".as_bytes();
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assert!(parse_domain(buf1).is_err());
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let buf1: &[u8] = "a-.com".as_bytes();
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assert!(parse_domain(buf1).is_err());
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let buf1: &[u8] = "a(x)y.com".as_bytes();
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assert!(parse_domain(buf1).is_err());
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}
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}
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