netstat

Cross-platform library to retrieve network sockets information. Tries to be optimal by using low-level OS APIs instead of command line utilities. Provides unified interface and returns data structures which may have additional fields depending on platform.

Usage

Add this to your Cargo.toml:

[dependencies]
netstat = "0.6"

Example program:

extern crate netstat;

use netstat::*;

fn main() {
    let af_flags = AddressFamilyFlags::IPV4 | AddressFamilyFlags::IPV6;
    let proto_flags = ProtocolFlags::TCP | ProtocolFlags::UDP;
    let sockets_info = get_sockets_info(af_flags, proto_flags).unwrap();
    for si in sockets_info {
        match si.protocol_socket_info {
            ProtocolSocketInfo::Tcp(tcp_si) => println!(
                "TCP {}:{} -> {}:{} {:?} - {}",
                tcp_si.local_addr,
                tcp_si.local_port,
                tcp_si.remote_addr,
                tcp_si.remote_port,
                si.associated_pids,
                tcp_si.state
            ),
            ProtocolSocketInfo::Udp(udp_si) => println!(
                "UDP {}:{} -> *:* {:?}",
                udp_si.local_addr, udp_si.local_port, si.associated_pids
            ),
        }
    }
}

Details

• On Windows, library uses GetExtendedTcpTable/GetExtendedUdpTable (iphlpapi).
• On Linux, it uses NETLINK_INET_DIAG protocol and performs pid lookup by traversing /proc/../fd/...
• On OS X, it should ideally use sysctls, but currently just parses netstat output (proper impletemention is mostly done in unused modules under src/integrations/osx folder, it waits for contributors with mac to finish it).