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/dev/null +++ b/src/main.rs @@ -0,0 +1,66 @@ +use procfs::process::FDTarget; +use std::collections::HashMap; + +struct Entry { + port: u16, + desc: String, +} + +fn get_entries() -> procfs::ProcResult> { + let all_procs = procfs::process::all_processes()?; + + // build up a map between socket inodes and process stat info. Ignore any + // error we encounter as it probably means we have no access to that + // process or something. + let mut map: HashMap = HashMap::new(); + for p in all_procs { + if let Ok(process) = p { + if !process.is_alive() { + continue; // Ignore zombies. + } + + if let (Ok(fds), Ok(cmd)) = (process.fd(), process.cmdline()) { + for fd in fds { + if let Ok(fd) = fd { + if let FDTarget::Socket(inode) = fd.target { + map.insert(inode, cmd.join(" ")); + } + } + } + } + } + } + + let mut h: HashMap = HashMap::new(); + + // Go through all the listening IPv4 and IPv6 sockets and take the first + // instance of listening on each port *if* the address is loopback or + // unspecified. (TODO: Do we want this restriction really?) + let tcp = procfs::net::tcp()?; + let tcp6 = procfs::net::tcp6()?; + for tcp_entry in tcp.into_iter().chain(tcp6) { + if tcp_entry.state == procfs::net::TcpState::Listen + && (tcp_entry.local_address.ip().is_loopback() + || tcp_entry.local_address.ip().is_unspecified()) + && !h.contains_key(&tcp_entry.local_address.port()) + { + if let Some(cmd) = map.get(&tcp_entry.inode) { + h.insert( + tcp_entry.local_address.port(), + Entry { + port: tcp_entry.local_address.port(), + desc: cmd.clone(), + }, + ); + } + } + } + + Ok(h.into_values().collect()) +} + +fn main() { + for e in get_entries().unwrap() { + println!("{}: {}", e.port, e.desc); + } +}