tcpie

Ping any TCP port

tcpie is a tool to measure latency and verify the reliabilty of a TCP connection. It does so by initiating a handshake followed by an immediately termination of the socket. While many existing tools require raw socket access, tcpie runs fine in user space. An API for use as a module is also provided.

CLI

Installation

$ npm i -g tcpie

Example

$ tcpie -c 5 google.com 443
TCPIE google.com (188.21.9.120) port 443
connected to google.com:443 seq=1 srcport=59053 time=12.9 ms
connected to google.com:443 seq=2 srcport=59054 time=10.0 ms
connected to google.com:443 seq=3 srcport=59055 time=10.1 ms
connected to google.com:443 seq=4 srcport=59056 time=11.4 ms
connected to google.com:443 seq=5 srcport=59057 time=10.4 ms

--- google.com tcpie statistics ---
5 handshakes attempted, 5 succeeded, 0% failed
rtt min/avg/max/stdev = 10.012/10.970/12.854/1.190 ms

API

Usage

import {tcpie} from "tcpie";
const pie = tcpie("google.com", 443, {count: 10, interval: 500, timeout: 2000});

pie.on("connect", function(stats) {
  console.info("connect", stats);
}).on("error", function(err, stats) {
  console.error(err, stats);
}).on("timeout", function(stats) {
  console.info("timeout", stats);
}).on("end", function(stats) {
  console.info(stats);
  // -> {
  // ->   sent: 10,
  // ->   success: 10,
  // ->   failed: 0,
  // ->   target: { host: "google.com", port: 443 }
  // -> }
}).start();

tcpie(host, [port], [options])

• host string : the destination host name or IP address. Required.
• port number : the destination port. Default: 22.
• opts object : options for count, interval and timeout. Defaults: Infinity, 1000, 3000.

tcpie#start()

Start connecting

tcpie#stop()

Stops connecting

options object

• count number : the number of connection attempts in milliseconds (default: Infinity).
• interval number : the interval between connection attempts in milliseconds (default: 1000).
• timeout number : the connection timeout in milliseconds (default: 3000).

Events

• connect : Arguments: stats. Connection attempt succeeded.
• timeout : Arguments: stats. Connection attempt ran into the timeout.
• error : Arguments: err, stats. Connection attempt failed.
• end : Arguments: stats. All connection attempts have finished.

stats argument properties

• sent number : number of total attempts made.
• success number : number of successfull attempts.
• failed number : number of failed attempts.
• target object : target details: host and port.

The following properties are present on all events except end:

• rtt number : roundtrip time in milliseconds. undefined if failed.
• socket object : socket details: localAddress, localPort, remoteAddress, remotePort.

© silverwind, distributed under BSD licence