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mod codec;
pub mod error;
use encoding::DecoderTrap;
use encoding::{all::GBK, Encoding};
use futures::stream::StreamExt;
use tokio::{
io::AsyncWriteExt,
net::TcpStream,
time::{self, Duration},
};
use tokio_util::codec::FramedRead;
use crate::codec::{Item, TelnetCodec};
use crate::error::TelnetError;
pub struct Telnet {
content: Vec<u8>,
stream: TcpStream,
prompt: String,
username_prompt: String,
password_prompt: String,
}
impl Telnet {
fn format_enter_str(s: &str) -> String {
if !s.ends_with('\n') {
format!("{}\n", s)
} else {
s.to_string()
}
}
pub async fn connect(addr: &str, timeout: Duration) -> Result<Self, TelnetError> {
let res = time::timeout(timeout, TcpStream::connect(addr)).await?;
Ok(Telnet {
content: vec![],
stream: res?,
prompt: String::from("~# "),
username_prompt: String::from("login: "),
password_prompt: String::from("Password: "),
})
}
pub async fn login(
&mut self,
username: &str,
password: &str,
timeout: Duration,
) -> Result<(), TelnetError> {
let user = Telnet::format_enter_str(username);
let pass = Telnet::format_enter_str(password);
let (read, mut write) = self.stream.split();
let mut telnet = FramedRead::new(read, TelnetCodec::default());
loop {
match time::timeout(timeout, telnet.next()).await {
Ok(res) => {
if let Some(res) = res {
match res? {
Item::Do(i) | Item::Dont(i) => {
if i == 0x1f {
write
.write(&[
0xff, 0xfb, 0x1f, 0xff, 0xfa, 0x1f, 0x00, 0xfc, 0x00,
0x1b, 0xff, 0xf0,
])
.await?;
} else {
write.write(&[0xff, 0xfc, i]).await?;
}
}
Item::Will(i) | Item::Wont(i) => {
write.write(&[0xff, 0xfe, i]).await?;
}
Item::Line(content) => {
if content.ends_with(self.username_prompt.as_bytes()) {
write.write(user.as_bytes()).await?;
} else if content.ends_with(self.password_prompt.as_bytes()) {
write.write(pass.as_bytes()).await?;
} else if content.ends_with(self.prompt.as_bytes()) {
return Ok(());
}
}
item => return Err(TelnetError::UnknownIAC(format!("{:?}", item))),
}
}
}
Err(e) => return Err(TelnetError::Timeout(e)),
}
}
}
pub async fn execute(&mut self, cmd: &str, timeout: Duration) -> Result<String, TelnetError> {
let command = Telnet::format_enter_str(cmd);
let (read, mut write) = self.stream.split();
match time::timeout(timeout, write.write(command.as_bytes())).await {
Ok(res) => res?,
Err(e) => return Err(TelnetError::Timeout(e)),
};
let mut telnet = FramedRead::new(read, TelnetCodec::default());
loop {
match time::timeout(timeout, telnet.next()).await {
Ok(res) => {
if let Some(item) = res {
if let Item::Line(mut line) = item? {
if line.ends_with(self.prompt.as_bytes()) {
break;
}
if line.starts_with(cmd.as_bytes()) {
continue;
}
self.content.append(&mut line);
}
}
}
Err(e) => return Err(TelnetError::Timeout(e)),
}
}
let output = String::from_utf8(self.content.clone());
let result = match output {
Ok(s) => Ok(s),
Err(e) => match GBK.decode(&self.content, DecoderTrap::Strict) {
Ok(gbk_out) => Ok(gbk_out),
Err(_) => Err(TelnetError::ParseError(e)),
},
};
self.content.clear();
result
}
pub fn set_prompt(&mut self, prompt: &str) -> &mut Self {
self.prompt = prompt.to_string();
self
}
pub fn set_username_prompt(&mut self, prompt: &str) -> &mut Self {
self.username_prompt = prompt.to_string();
self
}
pub fn set_password_prompt(&mut self, prompt: &str) -> &mut Self {
self.password_prompt = prompt.to_string();
self
}
}