https://github.com/weaveworks/procspy

Go module to list all TCP connections, with an option to try to find the owning PID and processname.

Works by reading /proc directly on Linux, and by executing netstat and lsof -i on Darwin.

Works for IPv4 and IPv6 TCP connections. Only established connections are listed; ports where something is only listening or TIME_WAITs are skipped.

If you want to find all processes you'll need to run this as root.

Status:

Tested on Linux and Darwin (10.9).

Install:

go install

Usage:

Only list the connections:

cs, err := procspy.Connections(false)
for c := cs.Next(); c != nil; c = cs.Next() {
    ...
}

List the connections and try to find the owning process:

cs, err := procspy.Connections(true)
for c := cs.Next(); c != nil; c = cs.Next() {
    ...
}

(See ./example_test.go)

package main

import (
	"fmt"

	"github.com/weaveworks/procspy"
)

func main() {
	lookupProcesses := true
	cs, err := procspy.Connections(lookupProcesses)
	if err != nil {
		panic(err)
	}

	fmt.Printf("TCP Connections:\n")
	for c := cs.Next(); c != nil; c = cs.Next() {
		fmt.Printf(" - %v\n", c)
	}
}