node_pcap/examples/simple_capture at master · unbug/node_pcap · GitHub

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#!/usr/bin/env node

/*global process require exports */

var util = require('util'),

pcap = require("pcap"), pcap_session;

if (process.argv.length > 4) {

util.error("usage: simple_capture interface filter");

util.error("Examples: ");

util.error(' simple_capture "" "tcp port 80"');

util.error(' simple_capture eth1 ""');

util.error(' simple_capture lo0 "ip proto \\tcp and tcp port 80"');

process.exit(1);

}

pcap_session = pcap.createSession(process.argv[2], process.argv[3]);

// libpcap's internal version numnber

util.puts(pcap.lib_version);

// Print all devices, currently listening device prefixed with an asterisk

pcap_session.findalldevs().forEach(function (dev) {

if (pcap_session.device_name === dev.name) {

util.print("* ");

}

util.print(dev.name + " ");

if (dev.addresses.length > 0) {

dev.addresses.forEach(function (address) {

util.print(address.addr + "/" + address.netmask);

});

util.print("\n");

} else {

util.print("no address\n");

}

});

// Listen for packets, decode them, and feed the simple printer. No tricks.

pcap_session.on('packet', function (raw_packet) {

var packet = pcap.decode.packet(raw_packet);

util.puts(pcap.print.packet(packet));

});

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