bitcore/Connection.js at master · cyberdot/bitcore · GitHub

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require('classtool');

function spec(b) {

var config = b.config || require('./config');

var log = b.log || require('./util/log');

var network = b.network || require('./networks')[config.network];

var MAX_RECEIVE_BUFFER = 10000000;

var PROTOCOL_VERSION = 70000;

var Binary = b.Binary || require('binary');

var Put = b.Put || require('bufferput');

var Buffers = b.Buffers || require('buffers');

require('./Buffers.monkey').patch(Buffers);

var noop = function() {};

var Block = require('./Block').class();

var Transaction = require('./Transaction').class();

var util = b.util || require('./util/util');

var Parser = b.Parser || require('./util/BinaryParser').class();

var doubleSha256 = b.doubleSha256 || util.twoSha256;

var nonce = util.generateNonce();

var BIP0031_VERSION = 60000;

function Connection(socket, peer) {

Connection.super(this, arguments);

this.socket = socket;

this.peer = peer;

// A connection is considered "active" once we have received verack

this.active = false;

// The version incoming packages are interpreted as

this.recvVer = 0;

// The version outgoing packages are sent as

this.sendVer = 0;

// The (claimed) height of the remote peer's block chain

this.bestHeight = 0;

// Is this an inbound connection?

this.inbound = !!socket.server;

// Have we sent a getaddr on this connection?

this.getaddr = false;

// Receive buffer

this.buffers = new Buffers();

// Starting 20 Feb 2012, Version 0.2 is obsolete

// This is the same behavior as the official client

if (new Date().getTime() > 1329696000000) {

this.recvVer = 209;

this.sendVer = 209;

}

this.setupHandlers();

};

Connection.superclass = b.superclass || require('events').EventEmitter;

Connection.prototype.setupHandlers = function () {

this.socket.addListener('connect', this.handleConnect.bind(this));

this.socket.addListener('error', this.handleError.bind(this));

this.socket.addListener('end', this.handleDisconnect.bind(this));

this.socket.addListener('data', (function (data) {

var dumpLen = 35;

log.debug('['+this.peer+'] '+

'Recieved '+data.length+' bytes of data:');

log.debug('... '+ data.slice(0, dumpLen > data.length ?

data.length : dumpLen).toHex() +

(data.length > dumpLen ? '...' : ''));

}).bind(this));

this.socket.addListener('data', this.handleData.bind(this));

};

Connection.prototype.handleConnect = function () {

if (!this.inbound) {

this.sendVersion();

}

this.emit('connect', {

conn: this,

socket: this.socket,

peer: this.peer

});

};

Connection.prototype.handleError = function(err) {

if (err.errno == 110 || err.errno == 'ETIMEDOUT') {

log.info('connection timed out for '+this.peer);

} else if (err.errno == 111 || err.errno == 'ECONNREFUSED') {

log.info('connection refused for '+this.peer);

} else {

log.warn('connection with '+this.peer+' '+err.toString());

}

this.emit('error', {

conn: this,

socket: this.socket,

peer: this.peer,

err: err

});

};

Connection.prototype.handleDisconnect = function () {

this.emit('disconnect', {

conn: this,

socket: this.socket,

peer: this.peer

});

};

Connection.prototype.handleMessage = function(message) {

if (!message) {

// Parser was unable to make sense of the message, drop it

return;

}

try {

switch (message.command) {

case 'version':

// Did we connect to ourself?

if (nonce.compare(message.nonce) === 0) {

this.socket.end();

return;

}

if (this.inbound) {

this.sendVersion();

}

if (message.version >= 209) {

this.sendMessage('verack', new Buffer([]));

}

this.sendVer = Math.min(message.version, PROTOCOL_VERSION);

if (message.version < 209) {

this.recvVer = Math.min(message.version, PROTOCOL_VERSION);

} else {

// We won't start expecting a checksum until after we've received

// the "verack" message.

this.once('verack', (function () {

this.recvVer = message.version;

}).bind(this));

}

this.bestHeight = message.start_height;

break;

case 'verack':

this.recvVer = Math.min(message.version, PROTOCOL_VERSION);

this.active = true;

break;

case 'ping':

if ("object" === typeof message.nonce) {

this.sendPong(message.nonce);

}

break;

}

} catch (e) {

log.err('Error while handling "'+message.command+'" message from ' +

this.peer + ':\n' +

(e.stack ? e.stack : e.toString()));

return;

}

this.emit(message.command, {

conn: this,

socket: this.socket,

peer: this.peer,

message: message

});

};

Connection.prototype.sendPong = function (nonce) {

this.sendMessage('pong', nonce);

};

Connection.prototype.sendVersion = function () {

var subversion = '/BitcoinX:0.1/';

var put = new Put();

put.word32le(PROTOCOL_VERSION); // version

put.word64le(1); // services

put.word64le(Math.round(new Date().getTime()/1000)); // timestamp

put.pad(26); // addr_me

put.pad(26); // addr_you

put.put(nonce);

put.varint(subversion.length);

put.put(new Buffer(subversion, 'ascii'));

put.word32le(0);

this.sendMessage('version', put.buffer());

};

Connection.prototype.sendGetBlocks = function (starts, stop, wantHeaders) {

var put = new Put();

put.word32le(this.sendVer);

put.varint(starts.length);

for (var i = 0; i < starts.length; i++) {

if (starts[i].length != 32) {

throw new Error('Invalid hash length');

}

put.put(starts[i]);

}

var stopBuffer = new Buffer(stop, 'binary');

if (stopBuffer.length != 32) {

throw new Error('Invalid hash length');

}

put.put(stopBuffer);

var command = 'getblocks';

if (wantHeaders)

command = 'getheaders';

this.sendMessage(command, put.buffer());

};

Connection.prototype.sendGetHeaders = function(starts, stop) {

this.sendGetBlocks(starts, stop, true);

};

Connection.prototype.sendGetData = function (invs) {

var put = new Put();

put.varint(invs.length);

for (var i = 0; i < invs.length; i++) {

put.word32le(invs[i].type);

put.put(invs[i].hash);

}

this.sendMessage('getdata', put.buffer());

};

Connection.prototype.sendGetAddr = function (invs) {

var put = new Put();

this.sendMessage('getaddr', put.buffer());

};

Connection.prototype.sendInv = function(data) {

if(!Array.isArray(data)) data = [data];

var put = new Put();

put.varint(data.length);

data.forEach(function (value) {

if (value instanceof Block) {

// Block

put.word32le(2); // MSG_BLOCK

} else {

// Transaction

put.word32le(1); // MSG_TX

}

put.put(value.getHash());

});

this.sendMessage('inv', put.buffer());

};

Connection.prototype.sendHeaders = function (headers) {

var put = new Put();

put.varint(headers.length);

headers.forEach(function (header) {

put.put(header);

// Indicate 0 transactions

put.word8(0);

});

this.sendMessage('headers', put.buffer());

};

Connection.prototype.sendTx = function (tx) {

this.sendMessage('tx', tx.serialize());

};

Connection.prototype.sendBlock = function (block, txs) {

var put = new Put();

// Block header

put.put(block.getHeader());

// List of transactions

put.varint(txs.length);

txs.forEach(function (tx) {

put.put(tx.serialize());

});

this.sendMessage('block', put.buffer());

};

Connection.prototype.sendMessage = function (command, payload) {

try {

var magic = network.magic;

var commandBuf = new Buffer(command, 'ascii');

if (commandBuf.length > 12) throw 'Command name too long';

var checksum;

if (this.sendVer >= 209) {

checksum = doubleSha256(payload).slice(0, 4);

} else {

checksum = new Buffer([]);

}

var message = new Put(); // -- HEADER --

message.put(magic); // magic bytes

message.put(commandBuf); // command name

message.pad(12 - commandBuf.length); // zero-padded

message.word32le(payload.length); // payload length

message.put(checksum); // checksum

// -- BODY --

message.put(payload); // payload data

var buffer = message.buffer();

log.debug('['+this.peer+'] '+

"Sending message "+command+" ("+payload.length+" bytes)");

this.socket.write(buffer);

} catch (err) {

// TODO: We should catch this error one level higher in order to better

// determine how to react to it. For now though, ignoring it will do.

log.err("Error while sending message to peer "+this.peer+": "+

(err.stack ? err.stack : err.toString()));

}

};

Connection.prototype.handleData = function (data) {

this.buffers.push(data);

if (this.buffers.length > MAX_RECEIVE_BUFFER) {

log.err("Peer "+this.peer+" exceeded maxreceivebuffer, disconnecting."+

(err.stack ? err.stack : err.toString()));

this.socket.destroy();

return;

}

this.processData();

};

Connection.prototype.processData = function () {

// If there are less than 20 bytes there can't be a message yet.

if (this.buffers.length < 20) return;

var magic = network.magic;

var i = 0;

for (;;) {

if (this.buffers.get(i ) === magic[0] &&

this.buffers.get(i+1) === magic[1] &&

this.buffers.get(i+2) === magic[2] &&

this.buffers.get(i+3) === magic[3]) {

if (i !== 0) {

log.debug('['+this.peer+'] '+

'Received '+i+

' bytes of inter-message garbage: ');

log.debug('... '+this.buffers.slice(0,i));

this.buffers.skip(i);

}

break;

}

if (i > (this.buffers.length - 4)) {

this.buffers.skip(i);

return;

}

i++;

}

var payloadLen = (this.buffers.get(16) ) +

(this.buffers.get(17) << 8) +

(this.buffers.get(18) << 16) +

(this.buffers.get(19) << 24);

var startPos = (this.recvVer >= 209) ? 24 : 20;

var endPos = startPos + payloadLen;

if (this.buffers.length < endPos) return;

var command = this.buffers.slice(4, 16).toString('ascii').replace(/\0+$/,"");

var payload = this.buffers.slice(startPos, endPos);

var checksum = (this.recvVer >= 209) ? this.buffers.slice(20, 24) : null;

log.debug('['+this.peer+'] ' +

"Received message " + command +

" (" + payloadLen + " bytes)");

if (checksum !== null) {

var checksumConfirm = doubleSha256(payload).slice(0, 4);

if (checksumConfirm.compare(checksum) !== 0) {

log.err('['+this.peer+'] '+

'Checksum failed',

{ cmd: command,

expected: checksumConfirm.toString('hex'),

actual: checksum.toString('hex') });

return;

}

var message;

try {

message = this.parseMessage(command, payload);

} catch (e) {

log.err('Error while parsing message '+command+' from ' +

this.peer + ':\n' +

(e.stack ? e.stack : e.toString()));

}

if (message) {

this.handleMessage(message);

}

this.buffers.skip(endPos);

this.processData();

};

Connection.prototype.parseMessage = function (command, payload) {

var parser = new Parser(payload);

var data = {

command: command

};

var i;

switch (command) {

case 'version': // https://en.bitcoin.it/wiki/Protocol_specification#version

data.version = parser.word32le();

data.services = parser.word64le();

data.timestamp = parser.word64le();

data.addr_me = parser.buffer(26);

data.addr_you = parser.buffer(26);

data.nonce = parser.buffer(8);

data.subversion = parser.varStr();

data.start_height = parser.word32le();

break;

case 'inv':

case 'getdata':

data.count = parser.varInt();

data.invs = [];

for (i = 0; i < data.count; i++) {

data.invs.push({

type: parser.word32le(),

hash: parser.buffer(32)

});

}

break;

case 'headers':

data.count = parser.varInt();

data.headers = [];

for (i = 0; i < data.count; i++) {

var header = new Block();

header.parse(parser);

data.headers.push(header);

}

break;

case 'block':

var block = new Block();

block.parse(parser);

data.block = block;

data.version = block.version;

data.prev_hash = block.prev_hash;

data.merkle_root = block.merkle_root;

data.timestamp = block.timestamp;

data.bits = block.bits;

data.nonce = block.nonce;

data.txs = block.txs;

data.size = payload.length;

break;

case 'tx':

var tx = new Transaction();

tx.parse(parser);

return {

command: command,

version: tx.version,

lock_time: tx.lock_time,

ins: tx.ins,

outs: tx.outs,

tx: tx,

};

case 'getblocks':

case 'getheaders':

// parse out the version

data.version = parser.word32le();

// TODO: Limit block locator size?

// reference implementation limits to 500 results

var startCount = parser.varInt();

data.starts = [];

for (i = 0; i < startCount; i++) {

data.starts.push(parser.buffer(32));

}

data.stop = parser.buffer(32);

break;

case 'addr':

var addrCount = parser.varInt();

// Enforce a maximum number of addresses per message

if (addrCount > 1000) {

addrCount = 1000;

}

data.addrs = [];

for (i = 0; i < addrCount; i++) {

// TODO: Time actually depends on the version of the other peer (>=31402)

data.addrs.push({

time: parser.word32le(),

services: parser.word64le(),

ip: parser.buffer(16),

port: parser.word16be()

});

}

break;

case 'alert':

data.payload = parser.varStr();

data.signature = parser.varStr();

break;

case 'ping':

if (this.recvVer > BIP0031_VERSION) {

data.nonce = parser.buffer(8);

}

break;

case 'getaddr':

case 'verack':

// Empty message, nothing to parse

break;

default:

log.err('Connection.parseMessage(): Command not implemented',

{cmd: command});

// This tells the calling function not to issue an event

return null;

}

return data;

};

return Connection;

};

module.defineClass(spec);

bitcore/Connection.js at master · cyberdot/bitcore · GitHub

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