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Supporting multiple pcap sessions #27

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Supporting multiple pcap sessions #27

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195abbc
Refactor into a class to support multiple pcap sessions
May 26, 2011
69ae171
decode UDP payload into 'data' attribute
May 26, 2011
318162b
Throw exception if pcap_dispatch returns an error.
Jun 6, 2011
6c3ff34
Stop the IOWatcher after closing the pcap session.
Jun 6, 2011
3b709ff
Emit an 'empty_read' event on empty read.
Jun 6, 2011
620de3d
Only increase the addresses array index when adding an item to it.
Jun 21, 2011
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46 changes: 22 additions & 24 deletions pcap.js
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Original file line number Original file line Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ var util, IOWatcher,
Buffer = require('buffer').Buffer, Buffer = require('buffer').Buffer,
events = require('events'), events = require('events'),
binding = require('./build/default/pcap_binding'), binding = require('./build/default/pcap_binding'),
Pcap = binding.Pcap,
HTTPParser = process.binding('http_parser').HTTPParser, HTTPParser = process.binding('http_parser').HTTPParser,
url = require('url'); url = require('url');


Expand All @@ -16,20 +17,8 @@ if (process.versions && process.versions.node && process.versions.node.split('.'
IOWatcher = process.IOWatcher; IOWatcher = process.IOWatcher;
} }


function Pcap() {
this.opened = false;
this.fd = null;

events.EventEmitter.call(this);
}
util.inherits(Pcap, events.EventEmitter);

exports.lib_version = binding.lib_version(); exports.lib_version = binding.lib_version();


Pcap.prototype.findalldevs = function () {
return binding.findalldevs();
};

Pcap.prototype.open = function (live, device, filter, buffer_size) { Pcap.prototype.open = function (live, device, filter, buffer_size) {
var me = this; var me = this;


Expand All @@ -40,14 +29,16 @@ Pcap.prototype.open = function (live, device, filter, buffer_size) {
} }


if (live) { if (live) {
this.device_name = device || binding.default_device(); this.device_name = device || this.default_device();
this.link_type = binding.open_live(this.device_name, filter || "", this.buffer_size); this.open_live(this.device_name, filter || "", this.buffer_size);
} else { } else {
this.device_name = device; this.device_name = device;
this.link_type = binding.open_offline(this.device_name, filter || "", this.buffer_size); this.open_offline(this.device_name, filter || "", this.buffer_size);
} }


this.fd = binding.fileno(); this.link_type = this.link_type();

this.fd = this.fileno();
this.opened = true; this.opened = true;
this.readWatcher = new IOWatcher(); this.readWatcher = new IOWatcher();
this.empty_reads = 0; this.empty_reads = 0;
Expand All @@ -63,26 +54,23 @@ Pcap.prototype.open = function (live, device, filter, buffer_size) {


// readWatcher gets a callback when pcap has data to read. multiple packets may be readable. // readWatcher gets a callback when pcap has data to read. multiple packets may be readable.
this.readWatcher.callback = function pcap_read_callback() { this.readWatcher.callback = function pcap_read_callback() {
var packets_read = binding.dispatch(me.buf, packet_ready); var packets_read = me.dispatch(me.buf, packet_ready);
if (packets_read < 1) { if (packets_read < 1) {
// TODO - figure out what is causing this, and if it is bad. // TODO - figure out what is causing this, and if it is bad.
me.empty_reads += 1; me.empty_reads += 1;
me.emit('empty_read', me.buf);
} }
}; };
this.readWatcher.set(this.fd, true, false); this.readWatcher.set(this.fd, true, false);
this.readWatcher.start(); this.readWatcher.start();
}; };


Pcap.prototype.close = function () { Pcap.prototype.close = function () {
this.opened = false; this._close();
binding.close(); this.readWatcher.stop();
// TODO - remove listeners so program will exit I guess? // TODO - remove listeners so program will exit I guess?
}; };


Pcap.prototype.stats = function () {
return binding.stats();
};

exports.Pcap = Pcap; exports.Pcap = Pcap;


exports.createSession = function (device, filter, buffer_size) { exports.createSession = function (device, filter, buffer_size) {
Expand Down Expand Up @@ -578,7 +566,17 @@ decode.udp = function (raw_packet, offset) {
if (ret.sport === 53 || ret.dport === 53) { if (ret.sport === 53 || ret.dport === 53) {
ret.dns = decode.dns(raw_packet, offset + 8); ret.dns = decode.dns(raw_packet, offset + 8);
} }


ret.data_offset = offset + 8;
ret.data_end = offset + 8 + ret.length;
ret.data_bytes = ret.data_end - ret.data_offset;
if (ret.data_bytes > 0) {
// add a buffer slice pointing to the data area of this UDP packet.
// Note that this does not make a copy
ret.data = raw_packet.slice(ret.data_offset, ret.data_end);
ret.data.length = ret.data_bytes;
}

return ret; return ret;
}; };


Expand Down
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