1 files changed, 136 insertions, 0 deletions
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..01b0f71
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,136 @@
+// Copyright 2018 Matthias P. Braendli
+// SPDX-License-Identifier: GPL-2.0-only
+extern crate libc;
+
+use std::fs::{OpenOptions, File};
+use std::ffi::{CStr, CString};
+use std::os::unix::io::AsRawFd;
+use std::thread;
+use std::net::TcpStream;
+use std::str::FromStr;
+use std::io::{Read, Write};
+
+extern {
+    fn kissattach(
+        callsign: * const libc::c_char,
+        speed: libc::int32_t,
+        mtu: libc::int32_t,
+        kttyname: * const libc::c_char,
+        allow_broadcast: libc::int32_t) -> libc::int32_t;
+}
+
+fn create_pts_pair() -> std::io::Result<File> {
+    let master_file = OpenOptions::new()
+        .read(true)
+        .write(true)
+        .open("/dev/ptmx")?;
+
+    unsafe {
+        let master_fd = master_file.as_raw_fd();
+        if libc::grantpt(master_fd) == -1 {
+            return Err(std::io::Error::last_os_error());
+        }
+        if libc::unlockpt(master_fd) == -1 {
+            return Err(std::io::Error::last_os_error());
+        }
+    }
+
+    Ok(master_file)
+}
+
+fn usage() {
+    eprintln!("fldigi-kissattach");
+    eprintln!(" Usage:");
+    eprintln!(" fldigi-kissattach CALLSIGN-SSID FLDIGI_IP:FLDIGI_PORT MTU");
+    eprintln!("");
+    eprintln!(" Example:");
+    eprintln!(" fldigi-kissattach HB9EGM-1 127.0.0.1:7342 120");
+
+    std::process::exit(1);
+}
+
+fn main() {
+    let args : Vec<String> = std::env::args().collect();
+    if args.len() != 4 {
+        usage();
+    }
+
+    let callsign = args[1].clone();
+    let fldigi_connect = args[2].clone();
+    let mtu = i32::from_str(&args[3]).unwrap();
+    eprintln!("Creating PTY pair");
+
+    let mut master_file = match create_pts_pair() {
+        Ok(fd) => fd,
+        Err(e) => panic!("create_pts_pair failed: {}", e)
+    };
+
+    eprintln!("PTS master: {:?}", master_file);
+
+    let slavename;
+    unsafe {
+        slavename = libc::ptsname(master_file.as_raw_fd());
+    }
+
+    if slavename.is_null() {
+        panic!("Cannot get PTS slave name");
+    }
+    unsafe {
+        let slice = CStr::from_ptr(slavename);
+        eprintln!("PTS slave: {:?}", slice);
+    }
+
+
+    let callsign = CString::new(callsign).expect("Failed to convert callsign to CString");
+    let speed : i32 = 9600;
+    let allow_broadcast : i32 = 1;
+
+    let success = unsafe {
+        kissattach(
+            callsign.as_ptr(),
+            speed,
+            mtu,
+            slavename,
+            allow_broadcast)
+    };
+
+    if success == 0 {
+        panic!("kissattach failed");
+    }
+
+
+    let mut radio = TcpStream::connect(fldigi_connect).unwrap();
+
+    let mut pty_tx_side = master_file.try_clone()
+        .expect("Cannot clone PTY file");
+
+    let mut radio_tx = radio.try_clone().unwrap();
+
+    let writer = thread::spawn(move || {
+        loop {
+            // read from pty, write to fldigi
+
+            let mut buf = [0; 1024];
+            let num_bytes_rx = pty_tx_side.read(&mut buf).unwrap();
+
+            let txdata = &buf[0..num_bytes_rx];
+            radio_tx.write(txdata).unwrap();
+        }
+    });
+
+    loop {
+        // read from fldigi, write to master_file
+
+        let mut buf = [0; 1024];
+        let num_bytes_rx = radio.read(&mut buf).unwrap();
+
+        if num_bytes_rx == 0 {
+            break;
+        }
+
+        let txdata = &buf[0..num_bytes_rx];
+        master_file.write(txdata).unwrap();
+    }
+
+    writer.join().unwrap();
+}