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move parseHttpRequest(), parseUdpRequest() to lib/parse_{http,udp}.js

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Astro 2014-12-10 00:44:45 +01:00
parent aea3c44c08
commit 1c754a2f49
4 changed files with 145 additions and 134 deletions
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3
lib/common.js
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@ -4,6 +4,9 @@
var querystring = require('querystring') var querystring = require('querystring')
exports.NUM_ANNOUNCE_PEERS = 50
exports.MAX_ANNOUNCE_PEERS = 82
exports.CONNECTION_ID = Buffer.concat([ toUInt32(0x417), toUInt32(0x27101980) ]) exports.CONNECTION_ID = Buffer.concat([ toUInt32(0x417), toUInt32(0x27101980) ])
exports.ACTIONS = { CONNECT: 0, ANNOUNCE: 1, SCRAPE: 2, ERROR: 3 } exports.ACTIONS = { CONNECT: 0, ANNOUNCE: 1, SCRAPE: 2, ERROR: 3 }
exports.EVENTS = { update: 0, completed: 1, started: 2, stopped: 3 } exports.EVENTS = { update: 0, completed: 1, started: 2, stopped: 3 }

60
lib/parse_http.js Normal file
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@ -0,0 +1,60 @@
var common = require('./common')
var REMOVE_IPV6_RE = /^::ffff:/
module.exports = parseHttpRequest
function parseHttpRequest (req, options) {
var s = req.url.split('?')
var params = common.querystringParse(s[1])
if (s[0] === '/announce') {
params.action = common.ACTIONS.ANNOUNCE
params.peer_id = typeof params.peer_id === 'string' && common.binaryToUtf8(params.peer_id)
params.port = Number(params.port)
if (typeof params.info_hash !== 'string') throw new Error('invalid info_hash')
if (params.info_hash.length !== 20) throw new Error('invalid info_hash length')
if (typeof params.peer_id !== 'string') throw new Error('invalid peer_id')
if (params.peer_id.length !== 20) throw new Error('invalid peer_id length')
if (!params.port) throw new Error('invalid port')
params.left = Number(params.left)
params.compact = Number(params.compact)
params.ip = options.trustProxy
? req.headers['x-forwarded-for'] || req.connection.remoteAddress
: req.connection.remoteAddress.replace(REMOVE_IPV6_RE, '') // force ipv4
params.addr = params.ip + ':' + params.port // TODO: ipv6 brackets?
params.numwant = Math.min(
Number(params.numwant) || common.NUM_ANNOUNCE_PEERS,
common.MAX_ANNOUNCE_PEERS
)
return params
} else if (s[0] === '/scrape') { // unofficial scrape message
params.action = common.ACTIONS.SCRAPE
if (typeof params.info_hash === 'string') {
params.info_hash = [ params.info_hash ]
}
if (params.info_hash) {
if (!Array.isArray(params.info_hash)) throw new Error('invalid info_hash array')
params.info_hash = params.info_hash.map(function (infoHash) {
if (infoHash.length !== 20) {
throw new Error('invalid info_hash')
}
return infoHash
})
}
return params
} else {
return null
}
}

79
lib/parse_udp.js Normal file
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@ -0,0 +1,79 @@
var bufferEqual = require('buffer-equal')
var common = require('./common')
module.exports = parseUdpRequest
function parseUdpRequest (msg, rinfo) {
if (msg.length < 16) {
throw new Error('received packet is too short')
}
if (rinfo.family !== 'IPv4') {
throw new Error('udp tracker does not support IPv6')
}
var params = {
connectionId: msg.slice(0, 8), // 64-bit
action: msg.readUInt32BE(8),
transactionId: msg.readUInt32BE(12)
}
// TODO: randomize:
if (!bufferEqual(params.connectionId, common.CONNECTION_ID)) {
throw new Error('received packet with invalid connection id')
}
if (params.action === common.ACTIONS.CONNECT) {
// No further params
} else if (params.action === common.ACTIONS.ANNOUNCE) {
params.info_hash = msg.slice(16, 36).toString('binary') // 20 bytes
params.peer_id = msg.slice(36, 56).toString('utf8') // 20 bytes
params.downloaded = fromUInt64(msg.slice(56, 64)) // TODO: track this?
params.left = fromUInt64(msg.slice(64, 72))
params.uploaded = fromUInt64(msg.slice(72, 80)) // TODO: track this?
params.event = msg.readUInt32BE(80)
params.event = common.EVENT_IDS[params.event]
if (!params.event) throw new Error('invalid event') // early return
params.ip = msg.readUInt32BE(84) // optional
params.ip = params.ip ?
ipLib.toString(params.ip) :
params.ip = rinfo.address
params.key = msg.readUInt32BE(88) // TODO: what is this for?
params.numwant = msg.readUInt32BE(92) // optional
// never send more than MAX_ANNOUNCE_PEERS or else the UDP packet will get bigger than
// 512 bytes which is not safe
params.numwant = Math.min(params.numwant || common.NUM_ANNOUNCE_PEERS, common.MAX_ANNOUNCE_PEERS)
params.port = msg.readUInt16BE(96) || rinfo.port // optional
params.addr = params.ip + ':' + params.port // TODO: ipv6 brackets
params.compact = 1 // udp is always compact
} else if (params.action === common.ACTIONS.SCRAPE) { // scrape message
params.info_hash = msg.slice(16, 36).toString('binary') // 20 bytes
// TODO: support multiple info_hash scrape
if (msg.length > 36) {
throw new Error('multiple info_hash scrape not supported')
}
} else {
return null
}
return params
}
// HELPER FUNCTIONS
var TWO_PWR_32 = (1 << 16) * 2
/**
* Return the closest floating-point representation to the buffer value. Precision will be
* lost for big numbers.
*/
function fromUInt64 (buf) {
var high = buf.readUInt32BE(0) | 0 // force
var low = buf.readUInt32BE(4) | 0
var lowUnsigned = (low >= 0) ? low : TWO_PWR_32 + low
return high * TWO_PWR_32 + lowUnsigned
}

137
server.js
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@ -1,8 +1,6 @@
module.exports = Server module.exports = Server
module.exports.parseHttpRequest = parseHttpRequest
var bencode = require('bencode') var bencode = require('bencode')
var bufferEqual = require('buffer-equal')
var common = require('./lib/common') var common = require('./lib/common')
var debug = require('debug')('bittorrent-tracker') var debug = require('debug')('bittorrent-tracker')
var dgram = require('dgram') var dgram = require('dgram')
@ -13,12 +11,12 @@ var ipLib = require('ip')
var portfinder = require('portfinder') var portfinder = require('portfinder')
var string2compact = require('string2compact') var string2compact = require('string2compact')
var parseHttpRequest = require('./lib/parse_http')
var parseUdpRequest = require('./lib/parse_udp')
// Use random port above 1024 // Use random port above 1024
portfinder.basePort = Math.floor(Math.random() * 60000) + 1025 portfinder.basePort = Math.floor(Math.random() * 60000) + 1025
var NUM_ANNOUNCE_PEERS = 50
var MAX_ANNOUNCE_PEERS = 82
var REMOVE_IPV6_RE = /^::ffff:/
inherits(Server, EventEmitter) inherits(Server, EventEmitter)
@ -369,119 +367,6 @@ Server.prototype._getPeersCompact = function (swarm, numwant) {
} }
function parseHttpRequest (req, options) {
var s = req.url.split('?')
var params = common.querystringParse(s[1])
if (s[0] === '/announce') {
params.action = common.ACTIONS.ANNOUNCE
params.peer_id = typeof params.peer_id === 'string' && common.binaryToUtf8(params.peer_id)
params.port = Number(params.port)
if (typeof params.info_hash !== 'string') throw new Error('invalid info_hash')
if (params.info_hash.length !== 20) throw new Error('invalid info_hash length')
if (typeof params.peer_id !== 'string') throw new Error('invalid peer_id')
if (params.peer_id.length !== 20) throw new Error('invalid peer_id length')
if (!params.port) throw new Error('invalid port')
params.left = Number(params.left)
params.compact = Number(params.compact)
params.ip = options.trustProxy
? req.headers['x-forwarded-for'] || req.connection.remoteAddress
: req.connection.remoteAddress.replace(REMOVE_IPV6_RE, '') // force ipv4
params.addr = params.ip + ':' + params.port // TODO: ipv6 brackets?
params.numwant = Math.min(
Number(params.numwant) || NUM_ANNOUNCE_PEERS,
MAX_ANNOUNCE_PEERS
)
return params
} else if (s[0] === '/scrape') { // unofficial scrape message
params.action = common.ACTIONS.SCRAPE
if (typeof params.info_hash === 'string') {
params.info_hash = [ params.info_hash ]
}
if (params.info_hash) {
if (!Array.isArray(params.info_hash)) throw new Error('invalid info_hash array')
params.info_hash = params.info_hash.map(function (infoHash) {
if (infoHash.length !== 20) {
throw new Error('invalid info_hash')
}
return infoHash
})
}
return params
} else {
return null
}
}
function parseUdpRequest (msg, rinfo) {
if (msg.length < 16) {
throw new Error('received packet is too short')
}
if (rinfo.family !== 'IPv4') {
throw new Error('udp tracker does not support IPv6')
}
var params = {
connectionId: msg.slice(0, 8), // 64-bit
action: msg.readUInt32BE(8),
transactionId: msg.readUInt32BE(12)
}
// TODO: randomize:
if (!bufferEqual(params.connectionId, common.CONNECTION_ID)) {
throw new Error('received packet with invalid connection id')
}
if (params.action === common.ACTIONS.CONNECT) {
// No further params
} else if (params.action === common.ACTIONS.ANNOUNCE) {
params.info_hash = msg.slice(16, 36).toString('binary') // 20 bytes
params.peer_id = msg.slice(36, 56).toString('utf8') // 20 bytes
params.downloaded = fromUInt64(msg.slice(56, 64)) // TODO: track this?
params.left = fromUInt64(msg.slice(64, 72))
params.uploaded = fromUInt64(msg.slice(72, 80)) // TODO: track this?
params.event = msg.readUInt32BE(80)
params.event = common.EVENT_IDS[params.event]
if (!params.event) throw new Error('invalid event') // early return
params.ip = msg.readUInt32BE(84) // optional
params.ip = params.ip ?
ipLib.toString(params.ip) :
params.ip = rinfo.address
params.key = msg.readUInt32BE(88) // TODO: what is this for?
params.numwant = msg.readUInt32BE(92) // optional
// never send more than MAX_ANNOUNCE_PEERS or else the UDP packet will get bigger than
// 512 bytes which is not safe
params.numwant = Math.min(params.numwant || NUM_ANNOUNCE_PEERS, MAX_ANNOUNCE_PEERS)
params.port = msg.readUInt16BE(96) || rinfo.port // optional
params.addr = params.ip + ':' + params.port // TODO: ipv6 brackets
params.compact = 1 // udp is always compact
} else if (params.action === common.ACTIONS.SCRAPE) { // scrape message
params.info_hash = msg.slice(16, 36).toString('binary') // 20 bytes
// TODO: support multiple info_hash scrape
if (msg.length > 36) {
throw new Error('multiple info_hash scrape not supported')
}
} else {
return null
}
return params
}
function makeUdpPacket (params) { function makeUdpPacket (params) {
switch (params.action) { switch (params.action) {
case common.ACTIONS.CONNECT: case common.ACTIONS.CONNECT:
@ -523,19 +408,3 @@ function makeUdpPacket (params) {
throw new Error('Action not implemented: ' + params.action) throw new Error('Action not implemented: ' + params.action)
} }
} }
// HELPER FUNCTIONS
var TWO_PWR_32 = (1 << 16) * 2
/**
* Return the closest floating-point representation to the buffer value. Precision will be
* lost for big numbers.
*/
function fromUInt64 (buf) {
var high = buf.readUInt32BE(0) | 0 // force
var low = buf.readUInt32BE(4) | 0
var lowUnsigned = (low >= 0) ? low : TWO_PWR_32 + low
return high * TWO_PWR_32 + lowUnsigned
}