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78 lines
2.5 KiB
Rust
78 lines
2.5 KiB
Rust
/* Copyright (C) 2021 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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use crate::common::nom7::take_until_and_consume;
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use nom7::combinator::peek;
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use nom7::bytes::complete::take;
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use nom7::{IResult};
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use nom7::number::streaming::le_u8;
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use nom7::bytes::streaming::tag;
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use nom7::bytes::streaming::{take_until};
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pub fn peek_message_is_ctl(i: &[u8]) -> IResult<&[u8], bool> {
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let (i, v) = peek(le_u8)(i)?;
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Ok((i, v == b'\xff'))
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}
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pub enum TelnetMessageType<'a> {
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Control(&'a [u8]),
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Data(&'a [u8]),
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}
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pub fn parse_ctl_suboption<'a>(i: &'a[u8], full: &'a[u8]) -> IResult<&'a[u8], &'a[u8]> {
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let (i, _sc) = le_u8(i)?;
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let tag: &[u8] = b"\xff\xf0";
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let (i, x) = take_until(tag)(i)?;
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let o = &full[..(x.len()+3)];
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Ok((i, o))
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}
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pub fn parse_ctl_message(oi: &[u8]) -> IResult<&[u8], &[u8]> {
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let (i, _) = tag(b"\xff")(oi)?;
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let (i, cmd) = le_u8(i)?;
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let (i, d) = match cmd {
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251..=254 => take(3_usize)(oi)?,
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240..=249 => take(2_usize)(oi)?,
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250 => parse_ctl_suboption(i, oi)?,
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_ => take(2_usize)(oi)?, // TODO maybe an error or some other special handling
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};
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Ok((i, d))
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}
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pub fn parse_message(i: &[u8]) -> IResult<&[u8], TelnetMessageType> {
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let (i, v) = peek(le_u8)(i)?;
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if v == b'\xff' {
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let (i, c) = parse_ctl_message(i)?;
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Ok((i, TelnetMessageType::Control(c)))
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} else {
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let (i, t) = take_until_and_consume(b"\n")(i)?;
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Ok((i, TelnetMessageType::Data(t)))
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}
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}
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// 'login: ', 'Password: ', possibly with leading ctls
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pub fn parse_welcome_message(i: &[u8]) -> IResult<&[u8], TelnetMessageType> {
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let (i, v) = peek(le_u8)(i)?;
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if v == b'\xff' {
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let (i, c) = parse_ctl_message(i)?;
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Ok((i, TelnetMessageType::Control(c)))
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} else {
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let (i, t) = take_until_and_consume(b": ")(i)?;
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Ok((i, TelnetMessageType::Data(t)))
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}
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}
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