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|
//! mmx150-probe — reverse-engineering tool for the MMX 150 dongle protocol.
//!
//! Phase 1 workflow: send candidate output reports to the dongle and observe
//! what input reports come back, correlating fields with headset on/off,
//! battery charge level and button presses.
use std::process::ExitCode;
use std::time::Duration;
use mmx150::hid::{find_devices_by_vendor, Hidraw, BEYERDYNAMIC_VID};
fn main() -> ExitCode {
let args: Vec<String> = std::env::args().skip(1).collect();
match args.first().map(String::as_str) {
Some("list") => cmd_list(&args[1..]),
Some("scan") => cmd_scan(),
Some("send") => cmd_send(&args[1..]),
_ => {
eprintln!("usage: mmx150-probe <list|scan|send <report_id> <hex>...>");
ExitCode::FAILURE
}
}
}
fn cmd_list(_rest: &[String]) -> ExitCode {
match find_devices_by_vendor(BEYERDYNAMIC_VID) {
Ok(devices) => {
for d in &devices {
println!(
"{:04x}:{:04x} {} {}",
d.vid,
d.pid,
d.devnode.display(),
d.name
);
}
if devices.is_empty() {
eprintln!("no beyerdynamic hidraw devices found");
return ExitCode::FAILURE;
}
ExitCode::SUCCESS
}
Err(e) => {
eprintln!("error: {e}");
ExitCode::FAILURE
}
}
}
fn cmd_scan() -> ExitCode {
let Some(dev) = mmx150::hid::find_mmx150().unwrap_or(None) else {
eprintln!("MMX 150 dongle not found");
return ExitCode::FAILURE;
};
println!("device: {} at {}", dev.name, dev.devnode.display());
let hid = match Hidraw::open(&dev.devnode) {
Ok(h) => h,
Err(e) => {
eprintln!("open failed: {e}");
return ExitCode::FAILURE;
}
};
// Known report sizes from the report descriptor:
// 62-byte reports: 0x24/0x27, 0x80/0x81, 0x34/0x37
// 60-byte reports: 0x2a/0x2b, 0x3a/0x3b
// 16-byte reports: 0x2c/0x2d, 0x3c/0x3d
for (report_id, len) in [
(0x24, 63usize),
(0x34, 63),
(0x80, 63),
(0x3a, 61),
(0x3b, 61),
(0x2a, 61),
(0x2b, 61),
(0x3d, 17),
(0x2d, 17),
] {
match hid.get_feature(report_id, len) {
Ok(buf) => println!("FEATURE 0x{report_id:02x}: {}", hex(&buf)),
Err(e) => println!("FEATURE 0x{report_id:02x}: {e}"),
}
}
for (report_id, len) in [
(0x27, 63usize),
(0x37, 63),
(0x81, 63),
(0x3c, 17),
(0x3d, 17),
(0x2c, 17),
(0x2d, 17),
] {
match hid.get_input(report_id, len) {
Ok(buf) => println!("GINPUT 0x{report_id:02x}: {}", hex(&buf)),
Err(e) => println!("GINPUT 0x{report_id:02x}: {e}"),
}
}
ExitCode::SUCCESS
}
fn cmd_send(rest: &[String]) -> ExitCode {
if rest.len() < 2 {
eprintln!("usage: mmx150-probe send <report_id> <hex bytes...>");
return ExitCode::FAILURE;
}
let Ok(report_id) = u8::from_str_radix(rest[0].trim_start_matches("0x"), 16) else {
eprintln!("bad report id");
return ExitCode::FAILURE;
};
let mut data = vec![report_id];
for part in &rest[1..] {
let bytes = parse_hex(part);
if bytes.is_empty() {
eprintln!("bad hex: {part}");
return ExitCode::FAILURE;
}
data.extend(bytes);
}
let Some(dev) = mmx150::hid::find_mmx150().unwrap_or(None) else {
eprintln!("MMX 150 dongle not found");
return ExitCode::FAILURE;
};
let hid = match Hidraw::open(&dev.devnode) {
Ok(h) => h,
Err(e) => {
eprintln!("open failed: {e}");
return ExitCode::FAILURE;
}
};
let mut hid = hid;
println!(
">> 0x{report_id:02x} [{}B] {}",
data.len() - 1,
hex(&data[1..])
);
// Try both the interrupt OUT endpoint and the control-transfer output
// report, then watch for a response on the interrupt IN endpoint.
match hid.write(&data) {
Ok(n) => println!("write() ok ({n}B)"),
Err(e) => println!("write() failed: {e}"),
}
match hid.send_output(&data) {
Ok(n) => println!("HIDIOCGSOUTPUT ok ({n}B)"),
Err(e) => println!("HIDIOCGSOUTPUT failed: {e}"),
}
read_responses(&mut hid);
ExitCode::SUCCESS
}
/// Poll the interrupt IN endpoint for a few seconds, printing reports.
fn read_responses(hid: &mut Hidraw) {
let deadline = std::time::Instant::now() + Duration::from_millis(3000);
loop {
let now = std::time::Instant::now();
if now >= deadline {
break;
}
let mut set = unsafe { std::mem::zeroed::<libc::fd_set>() };
unsafe { libc::FD_ZERO(&mut set) };
unsafe { libc::FD_SET(hid.as_raw_fd(), &mut set) };
let remaining = deadline.saturating_duration_since(now).as_millis();
let mut timeout = libc::timeval {
tv_sec: (remaining / 1000) as i64,
tv_usec: ((remaining % 1000) * 1000) as i64,
};
let n = unsafe {
libc::select(
hid.as_raw_fd() + 1,
&mut set,
std::ptr::null_mut(),
std::ptr::null_mut(),
&mut timeout,
)
};
if n <= 0 {
break;
}
let mut buf = [0u8; 256];
match hid.read(&mut buf) {
Ok(len) => println!("<< [{}B] {}", len, hex(&buf[..len])),
Err(e) => {
println!("read failed: {e}");
break;
}
}
}
}
fn hex(bytes: &[u8]) -> String {
bytes
.iter()
.map(|b| format!("{b:02x}"))
.collect::<Vec<_>>()
.join(" ")
}
fn parse_hex(s: &str) -> Vec<u8> {
let s = s.trim_start_matches("0x");
if s.len() % 2 != 0 {
return Vec::new();
}
s.as_bytes()
.chunks(2)
.map(|c| {
let hi = (c[0] as char).to_digit(16)?;
let lo = (c[1] as char).to_digit(16)?;
Some((hi * 16 + lo) as u8)
})
.collect::<Option<Vec<u8>>>()
.unwrap_or_default()
}
|
