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View File

@ -1,15 +0,0 @@
[package]
name = "forktop"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
log = "0.4"
env_logger = "0.9"
thiserror = "1"
async-std = "1"
futures = "0.3.17"
nix = "0.23.1"

View File

@ -1,12 +0,0 @@
use async_std::io;
use thiserror::Error;
#[derive(Error, Debug)]
pub enum Error {
#[error("{msg}: {src}")]
Nix { msg: &'static str, src: nix::Error },
#[error("io: {0}")]
Io(#[from] io::Error),
}

View File

@ -1,250 +0,0 @@
use log::{debug, error, info, warn};
mod error;
use error::Error;
use std::collections::HashMap;
use std::ffi::{CStr, CString};
use std::os::unix::io::{FromRawFd, RawFd};
use std::sync::Arc;
use async_std::fs::File;
use async_std::io::{self, ReadExt, WriteExt};
use async_std::sync::Mutex;
use async_std::task;
use futures::try_join;
use nix::sys::ptrace::{self, Event, Options};
use nix::sys::signal::Signal;
use nix::sys::wait::{wait, WaitStatus};
use nix::unistd::Pid;
use nix::unistd::{self, ForkResult};
struct Child {
pid: Pid,
stdin: File,
stdout: File,
stderr: File,
}
struct ProcessDescription {
state: ProcessState,
parent: Option<Pid>,
name: Option<String>,
}
enum ProcessState {
Traced,
Completed(u8),
}
fn main() -> Result<(), Error> {
let env = env_logger::Env::new().filter_or("LOG", "info");
env_logger::init_from_env(env);
info!("forking child process...");
let child = spawn_child()?;
task::block_on(async_main(child))
}
fn spawn_child() -> Result<Child, Error> {
let child_stdin = unistd::pipe().map_err(|e| Error::Nix {
msg: "pipe",
src: e,
})?;
let child_stdout = unistd::pipe().map_err(|e| Error::Nix {
msg: "pipe",
src: e,
})?;
let child_stderr = unistd::pipe().map_err(|e| Error::Nix {
msg: "pipe",
src: e,
})?;
let pid = unsafe {
match nix::unistd::fork().map_err(|e| Error::Nix {
msg: "fork",
src: e,
})? {
ForkResult::Parent { child } => child,
ForkResult::Child => {
let err = run_child(
vec!["/bin/sh", "-c", "/bin/true"],
child_stdin.0,
child_stdout.1,
child_stderr.1,
);
error!("error spawning child: {}", err);
std::process::exit(1);
}
}
};
Ok(Child {
pid,
stdin: unsafe { File::from_raw_fd(child_stdin.1) },
stdout: unsafe { File::from_raw_fd(child_stdout.0) },
stderr: unsafe { File::from_raw_fd(child_stderr.0) },
})
}
fn run_child(args: Vec<&str>, stdin: RawFd, stdout: RawFd, stderr: RawFd) -> Error {
enum Never {}
fn int(args: Vec<&str>, stdin: RawFd, stdout: RawFd, stderr: RawFd) -> Result<Never, Error> {
// swap 3 main fds
unistd::dup2(stdin, 0).map_err(|e| Error::Nix {
msg: "dup2",
src: e,
})?;
unistd::dup2(stdout, 1).map_err(|e| Error::Nix {
msg: "dup2",
src: e,
})?;
unistd::dup2(stderr, 2).map_err(|e| Error::Nix {
msg: "dup2",
src: e,
})?;
// ask to be traced (stops process)
ptrace::traceme().map_err(|e| Error::Nix {
msg: "PTRACE_TRACEME",
src: e,
})?;
unistd::execve::<_, &CStr>(
&CString::new(args[0]).unwrap(),
args.into_iter()
.map(CString::new)
.map(Result::unwrap)
.collect::<Vec<_>>()
.as_slice(),
&[],
)
.map_err(|e| Error::Nix {
msg: "execve",
src: e,
})?;
unreachable!("execve doesn't return on success")
}
match int(args, stdin, stdout, stderr) {
Ok(s) => match s {},
Err(e) => e,
}
}
async fn async_main(child: Child) -> Result<(), Error> {
let child_stdin = child.stdin;
let child_stdout = child.stdout;
let child_stderr = child.stderr;
let child = child.pid;
let children = Arc::new(Mutex::new({
let mut m = HashMap::new();
m.insert(
child,
ProcessDescription {
state: ProcessState::Traced,
parent: None,
name: Some("main".to_string()),
},
);
m
}));
let wait_loop = task::spawn(wait_loop(children.clone()));
ptrace::setoptions(
child,
Options::PTRACE_O_TRACECLONE
| Options::PTRACE_O_TRACEFORK
| Options::PTRACE_O_TRACEEXIT
| Options::PTRACE_O_TRACEVFORK,
)
.map_err(|e| Error::Nix {
msg: "PTRACE_SETOPTIONS",
src: e,
})?;
ptrace::cont(child, None).map_err(|e| Error::Nix {
msg: "PTRACE_CONT",
src: e,
})?;
try_join!(wait_loop, task::spawn(handle_input(child_stdin)))?;
Ok(())
}
async fn handle_input(mut stdin_pipe: File) -> Result<(), Error> {
let mut stdin = io::stdin();
let mut bytes_in = vec![0 as u8; 128];
let mut bytes_out = vec![0 as u8; 128];
loop {
let num_read = stdin.read(&mut bytes_in).await?;
for i in 0..num_read {
debug!("forwarded byte: {}", i);
bytes_out[i] = bytes_in[i];
}
stdin_pipe.write_all(&bytes_out[0..num_read]).await?;
}
}
async fn wait_loop(children: Arc<Mutex<HashMap<Pid, ProcessDescription>>>) -> Result<(), Error> {
while !children.lock().await.is_empty() {
let wait_result = wait().map_err(|e| Error::Nix {
msg: "wait",
src: e,
})?;
match &wait_result {
WaitStatus::PtraceEvent(pid, _, event) => match match_event(*event) {
Some(Event::PTRACE_EVENT_FORK) => info!("process {} forked", pid),
Some(Event::PTRACE_EVENT_VFORK) => info!("process {} vforked", pid),
Some(Event::PTRACE_EVENT_CLONE) => info!("process {} cloned", pid),
Some(Event::PTRACE_EVENT_EXEC) => info!("process {} execed", pid),
Some(Event::PTRACE_EVENT_VFORK_DONE) => {
info!("process {} returned from vfork", pid)
}
Some(Event::PTRACE_EVENT_EXIT) => info!("process {} exited", pid),
Some(Event::PTRACE_EVENT_SECCOMP) => {
info!("process {} triggered a seccomp rule", pid)
}
Some(Event::PTRACE_EVENT_STOP) => info!("process {} stopped", pid),
Some(e) => warn!("new ptrace event added: {:?}", e),
None => warn!("unrecognised ptrace event: {}", event),
},
WaitStatus::Stopped(pid, signal) => {
info!("process {} stopped with signal {}", pid, signal)
}
s => warn!("unhandled signal: {:?}", s),
};
}
Ok(())
}
fn match_event(v: i32) -> Option<Event> {
match v {
1 => Some(Event::PTRACE_EVENT_FORK),
2 => Some(Event::PTRACE_EVENT_VFORK),
3 => Some(Event::PTRACE_EVENT_CLONE),
4 => Some(Event::PTRACE_EVENT_EXEC),
5 => Some(Event::PTRACE_EVENT_VFORK_DONE),
6 => Some(Event::PTRACE_EVENT_EXIT),
7 => Some(Event::PTRACE_EVENT_SECCOMP),
128 => Some(Event::PTRACE_EVENT_STOP),
_ => None,
}
}