commit e6148f6d50fe57a40595df03fb730f371d8d02f5
Author: Andrew Pamment <apamment@positronicbrain.net>
Date:   Wed Nov 15 11:07:08 2023 +1000

    initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4fffb2f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..4c7d07b
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "doorlib"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anes = "0.1.6"
+
+[target.'cfg(target_family = "unix")'.dependencies]
+termios = "0.3.3"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..f3e8c8d
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,360 @@
+#[cfg(target_family = "unix")]
+use termios::{cfmakeraw, tcsetattr, Termios, TCSANOW};
+
+use anes::{esc, ResetAttributes};
+use std::env;
+use std::fs::read_to_string;
+use std::io;
+use std::io::{Read, Write};
+use std::net::TcpStream;
+use std::process;
+use std::thread;
+use std::time::{Duration, Instant};
+
+type Result<T> = std::result::Result<T, io::Error>;
+
+#[derive(Debug)]
+enum ConnType {
+    Local,
+    Serial,
+    Telnet(i64),
+}
+
+#[derive(Debug)]
+#[allow(dead_code)]
+pub struct UserInfo {
+    typ: ConnType,
+    bbsid: String,
+    record: i32,
+    realname: String,
+    alias: String,
+    seclevel: i32,
+    timeleft: u64,
+    emulation: i32,
+    node: i32,
+    timeout: Instant,
+    starttime: Instant,
+}
+
+pub trait Conn {
+    fn write(&mut self, data: &[u8]) -> Result<()>;
+
+    fn write_str(&mut self, s: &str) -> Result<()> {
+        self.write(s.as_bytes())
+    }
+
+    fn write_ln(&mut self, line: &str) -> Result<()> {
+        self.write_str(line)?;
+        self.write_str("\r\n")
+    }
+
+    fn read_byte(&mut self) -> Result<u8>;
+
+    fn info(&self) -> &UserInfo;
+}
+
+struct LocalUser {
+    info: UserInfo,
+    #[cfg(target_family = "unix")]
+    termios: Termios,
+}
+
+impl LocalUser {
+    fn new(info: UserInfo) -> LocalUser {
+        #[cfg(target_family = "unix")]
+        {
+            let termios = Termios::from_fd(0).expect("terminal mode");
+            let mut raw = termios;
+            cfmakeraw(&mut raw);
+            tcsetattr(0, TCSANOW, &raw).expect("terminal raw mode");
+            LocalUser { info, termios }
+        }
+        #[cfg(target_family = "windows")]
+        LocalUser { info }
+    }
+}
+
+impl Conn for LocalUser {
+    fn write(&mut self, data: &[u8]) -> Result<()> {
+        #[cfg(target_family = "unix")]
+        {
+            io::stdout().write_all(data)?;
+            io::stdout().flush()
+        }
+        #[cfg(target_family = "windows")]
+        Ok(())
+    }
+
+    fn read_byte(&mut self) -> Result<u8> {
+        let mut byte = 0u8;
+        #[cfg(target_family = "unix")]
+        {
+            io::stdin()
+                .lock()
+                .read_exact(std::slice::from_mut(&mut byte))?;
+        }
+        Ok(byte)
+    }
+
+    fn info(&self) -> &UserInfo {
+        &self.info
+    }
+}
+
+impl Drop for LocalUser {
+    fn drop(&mut self) {
+        #[cfg(target_family = "unix")]
+        tcsetattr(0, TCSANOW, &self.termios).expect("reset terminal");
+    }
+}
+
+#[derive(Debug)]
+struct NetUser {
+    info: UserInfo,
+    stream: TcpStream,
+}
+
+impl NetUser {
+    fn read1(&mut self) -> Result<u8> {
+        let mut rx_byte: u8 = 0;
+        loop {
+            match self.stream.read(std::slice::from_mut(&mut rx_byte)) {
+                Ok(_) => {
+                    self.info.timeout = Instant::now();
+                    return Ok(rx_byte);
+                }
+                Err(e) if e.kind() == io::ErrorKind::WouldBlock => {
+                    self.maybe_timeout();
+                    self.maybe_out_of_time();
+                    thread::sleep(Duration::from_millis(100));
+                }
+                Err(e) => return Err(e),
+            }
+        }
+    }
+
+    fn maybe_timeout(&mut self) {
+        const TIME_OUT: u64 = 300;
+        if self.info.timeout.elapsed().as_secs() >= TIME_OUT {
+            let e = esc!("[1;31m");
+            self.write_ln(format!("\r\n\r\n{e}Timeout!{ResetAttributes}").as_str())
+                .expect("write");
+            process::exit(0);
+        }
+    }
+
+    fn maybe_out_of_time(&mut self) {
+        let start_time = self.info.starttime;
+        let time_left = self.info.timeleft;
+        if start_time.elapsed().as_secs() >= time_left {
+            let e = esc!("[1;31m");
+            self.write_ln(format!("\r\n\r\n{e}You're out of time!{ResetAttributes}\r\n").as_str())
+                .expect("write");
+            process::exit(0);
+        }
+    }
+}
+
+impl Conn for NetUser {
+    fn write(&mut self, data: &[u8]) -> Result<()> {
+        self.stream.write_all(data)?;
+        Ok(())
+    }
+
+    fn read_byte(&mut self) -> Result<u8> {
+        let mut state = 0;
+        loop {
+            let rx_byte = self.read1()?;
+            state = match (state, rx_byte) {
+                (0, 255) => 1,
+                (0, _) => return Ok(rx_byte),
+                (1, 255) => {
+                    self.stream.write_all(std::slice::from_ref(&rx_byte))?;
+                    0
+                }
+                (1, 250) => 3,
+                (1, _) => 2,
+                (2, _) => 0,
+                (3, 240) => 0,
+                _ => state,
+            };
+        }
+    }
+
+    fn info(&self) -> &UserInfo {
+        &self.info
+    }
+}
+
+pub struct User {
+    typ: bool,
+    netuser: Option<NetUser>,
+    localuser: Option<LocalUser>,
+}
+
+impl Conn for User {
+    fn write(&mut self, data: &[u8]) -> Result<()> {
+        match self.typ {
+            true => {
+                self.netuser.as_mut().unwrap().write(data)?;
+                return Ok(());
+            }
+            false => {
+                self.localuser.as_mut().unwrap().write(data)?;
+                return Ok(());
+            }
+        };
+    }
+
+    fn read_byte(&mut self) -> Result<u8> {
+        match self.typ {
+            true => return self.netuser.as_mut().unwrap().read_byte(),
+            false => return self.localuser.as_mut().unwrap().read_byte(),
+        };
+    }
+
+    fn info(&self) -> &UserInfo {
+        match self.typ {
+            true => return &self.netuser.as_ref().unwrap().info,
+            false => return &self.localuser.as_ref().unwrap().info,
+        };
+    }
+}
+
+pub fn display_file(user: &mut User, path: &str) -> Result<()> {
+    if let Ok(file) = std::fs::read(path) {
+        user.write(&file)?;
+        user.write_str(ResetAttributes.to_string().as_str())?;
+    }
+    Ok(())
+}
+
+pub fn read_string(user: &mut impl Conn, len: usize) -> Result<String> {
+    const BACKSPACE: [u8; 3] = *b"\x08\x20\x08";
+
+    user.write_str(esc!("[s"))?;
+    user.write_str(esc!("[1;37;45m"))?;
+    for _i in 1..len {
+        user.write_str(" ")?;
+    }
+    user.write_str(esc!("[u"))?;
+
+    let mut received: Vec<u8> = vec![];
+    while received.len() != len {
+        let ch = user.read_byte()?;
+        match ch {
+            0 | 10 => {}
+            13 => break,
+            127 | 8 => {
+                if !received.is_empty() {
+                    user.write(&BACKSPACE)?;
+                    received.truncate(received.len() - 1);
+                }
+            }
+            _ => {
+                user.write(std::slice::from_ref(&ch))?;
+                received.extend_from_slice(&[ch]);
+            }
+        }
+    }
+    let s = std::str::from_utf8(&received).unwrap().to_string();
+    user.write_ln(ResetAttributes.to_string().as_str())?;
+    Ok(s)
+}
+
+fn read_lines(filename: &str) -> Result<Vec<String>> {
+    let s = read_to_string(filename)?;
+    Ok(s.lines().map(str::to_owned).collect())
+}
+
+fn read_trimmed_lines(path: &str) -> Result<Vec<String>> {
+    let lines = read_lines(path)?;
+    Ok(lines.into_iter().map(|s| s.trim().to_owned()).collect())
+}
+
+fn read_door32(path: &str) -> Result<UserInfo> {
+    let lines = read_trimmed_lines(path)?;
+    let typ = match lines[0].parse::<i32>().expect("i32") {
+        0 => ConnType::Local,
+        1 => ConnType::Serial,
+        2 => ConnType::Telnet(lines[1].parse().expect("door32.sys socket")),
+        _ => ConnType::Local,
+    };
+    let info = UserInfo {
+        typ,
+        bbsid: lines[3].clone(),
+        record: lines[4].parse().expect("door32.sys record"),
+        realname: lines[5].clone(),
+        alias: lines[6].clone(),
+        seclevel: lines[7].parse().expect("door32.sys seclevel"),
+        timeleft: lines[8].parse().expect("door32.sys timeleft"),
+        emulation: lines[9].parse().expect("door32.sys emulation"),
+        node: lines[10].parse().expect("door32.sys node"),
+        timeout: Instant::now(),
+        starttime: Instant::now(),
+    };
+    Ok(info)
+}
+
+fn convert_socket(sock: i64) -> Result<TcpStream> {
+    #[cfg(target_family = "unix")]
+    let stream = unsafe {
+        use std::os::fd::FromRawFd;
+        TcpStream::from_raw_fd(sock as i32)
+    };
+    #[cfg(target_family = "windows")]
+    let stream = unsafe {
+        use std::os::windows::io::FromRawSocket;
+        drop(std::net::TcpListener::bind("255.255.255.255:0")); // hack to get WSAStartup to fire
+        TcpStream::from_raw_socket(sock as u64)
+    };
+    stream.set_nonblocking(true)?;
+    Ok(stream)
+}
+
+pub fn init() -> Result<User> {
+    let args = env::args().collect::<Vec<_>>();
+    if args.len() < 2 || 3 < args.len() {
+        panic!("Usage: door.exe door32.sys [socket]");
+    }
+    let info = read_door32(&args[1]).expect("read door32.sys");
+    let fd = if args.len() == 3 {
+        let fd = args[2].parse().expect("Socket is an integer");
+        if fd > 0 {
+            fd
+        } else if let ConnType::Telnet(fd) = info.typ {
+            fd
+        } else {
+            0
+        }
+    } else {
+        if let ConnType::Telnet(fd) = info.typ {
+            fd
+        } else {
+            0
+        }
+    };
+    match info.typ {
+        ConnType::Serial => panic!("UART not supported"),
+        ConnType::Local => {
+            let user = LocalUser::new(info);
+
+            let u = User {
+                typ: false,
+                netuser: None,
+                localuser: Some(user),
+            };
+            return Ok(u);
+        }
+        ConnType::Telnet(_) => {
+            let stream = convert_socket(fd).expect("tcp stream");
+            let user = NetUser { info, stream };
+            let u = User {
+                typ: true,
+                netuser: Some(user),
+                localuser: None,
+            };
+            return Ok(u);
+        }
+    };
+}