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/* Copyright (C) 2021 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
use crate::common::nom7::take_until_and_consume;
use nom7::combinator::peek;
use nom7::bytes::complete::take;
use nom7::{IResult};
use nom7::number::streaming::le_u8;
use nom7::bytes::streaming::tag;
use nom7::bytes::streaming::{take_until};
pub fn peek_message_is_ctl(i: &[u8]) -> IResult<&[u8], bool> {
let (i, v) = peek(le_u8)(i)?;
Ok((i, v == b'\xff'))
}
pub enum TelnetMessageType<'a> {
Control(&'a [u8]),
Data(&'a [u8]),
}
pub fn parse_ctl_suboption<'a>(i: &'a[u8], full: &'a[u8]) -> IResult<&'a[u8], &'a[u8]> {
let (i, _sc) = le_u8(i)?;
let tag: &[u8] = b"\xff\xf0";
let (i, x) = take_until(tag)(i)?;
let o = &full[..(x.len()+3)];
Ok((i, o))
}
pub fn parse_ctl_message(oi: &[u8]) -> IResult<&[u8], &[u8]> {
let (i, _) = tag(b"\xff")(oi)?;
let (i, cmd) = le_u8(i)?;
let (i, d) = match cmd {
251..=254 => take(3_usize)(oi)?,
240..=249 => take(2_usize)(oi)?,
250 => parse_ctl_suboption(i, oi)?,
_ => take(2_usize)(oi)?, // TODO maybe an error or some other special handling
};
Ok((i, d))
}
pub fn parse_message(i: &[u8]) -> IResult<&[u8], TelnetMessageType> {
let (i, v) = peek(le_u8)(i)?;
if v == b'\xff' {
let (i, c) = parse_ctl_message(i)?;
Ok((i, TelnetMessageType::Control(c)))
} else {
let (i, t) = take_until_and_consume(b"\n")(i)?;
Ok((i, TelnetMessageType::Data(t)))
}
}
// 'login: ', 'Password: ', possibly with leading ctls
pub fn parse_welcome_message(i: &[u8]) -> IResult<&[u8], TelnetMessageType> {
let (i, v) = peek(le_u8)(i)?;
if v == b'\xff' {
let (i, c) = parse_ctl_message(i)?;
Ok((i, TelnetMessageType::Control(c)))
} else {
let (i, t) = take_until_and_consume(b": ")(i)?;
Ok((i, TelnetMessageType::Data(t)))
}
}
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