630 lines
20 KiB
JavaScript
630 lines
20 KiB
JavaScript
/**
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* Working with messages.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#Message_types}
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* @see {@link https://bitmessage.org/wiki/Protocol_specification_v3#Message_types}
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* @see {@link https://bitmessage.org/Bitmessage%20Technical%20Paper.pdf}
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* @module bitmessage/messages
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* @example
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* var structs = require("bitmessage").structs;
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* var messages = require("bitmessage").messages;
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*
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* // Simple encoding and decoding:
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* var vermsg = messages.version.encode({
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* remoteHost: "1.1.1.1",
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* remotePort: 8444,
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* });
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* console.log(messages.version.decode(vermsg).remoteHost); // 1.1.1.1
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*
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* // Low-level encoding and decoding:
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* var addrPayload = messages.addr.encodePayload([
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* {host: "2.2.2.2", port: 28444},
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* ]);
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* var addrmsg = structs.message.encode("addr", addrPayload);
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* var decoded = structs.message.decode(addrmsg);
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* console.log(decoded.command); // addr
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* var addr = messages.addr.decodePayload(decoded.payload);
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* console.log(addr.addrs[0].host); // 2.2.2.2
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*
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* // Encode with empty payload:
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* var verackmsg = structs.message.encode("verack");
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* console.log(structs.message.decode(verackmsg).command); // verack
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*/
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"use strict";
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var objectAssign = Object.assign || require("object-assign");
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var bufferEqual = require("buffer-equal");
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var assert = require("./_util").assert;
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var structs = require("./structs");
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var bmcrypto = require("./crypto");
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var UserAgent = require("./user-agent");
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var util = require("./_util");
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var message = structs.message;
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var ServicesBitfield = structs.ServicesBitfield;
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var IPv4_MAPPING = util.IPv4_MAPPING;
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var inet_pton = util.inet_pton;
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/**
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* Try to get command of the given encoded message.
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* Note that this function doesn't do any validation because it is
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* already provided by
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* [message.decode]{@link module:bitmessage/structs.message.decode}
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* routine.
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* @param {Buffer} buf - Buffer that starts with encoded message
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* @return {?string} Message's command if any.
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*/
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exports.getCommand = function(buf) {
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if (buf.length < 16) {
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return;
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}
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var command = buf.slice(4, 16);
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var firstNonNull = 0;
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for (var i = 11; i >=0; i--) {
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if (command[i] !== 0) {
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firstNonNull = i + 1;
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break;
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}
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}
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return command.slice(0, firstNonNull).toString("ascii");
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};
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/**
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* `version` message.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#version}
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* @namespace
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* @static
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*/
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var version = exports.version = {
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/**
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* @typedef {Object} DecodeResult
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* @property {number} protoVersion - Identifies protocol version being
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* used by the node. Should equal 3. Nodes should disconnect if the
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* remote node's version is lower but continue with the connection if
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* it is higher.
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* @property {Object} services -
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* [Service]{@link module:bitmessage/structs.ServicesBitfield}
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* features to be enabled for this connection
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* @property {Date} time - Node time
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* @property {string} remoteHost - IPv4/IPv6 address of the node
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* receiving this message
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* @property {number} remotePort - Port of the node receiving this
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* message
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* @property {number} port - Incoming port of the node sending this
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* message
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* @property {Buffer} nonce - An 8-byte random nonce used to detect
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* connection to self
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* @property {string} userAgent - [User agent]{@link
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* module:bitmessage/user-agent} of the node
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* @property {number[]} streams - Streams accepted by the node
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* @property {number} length - Real data length
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* @memberof module:bitmessage/messages.version
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*/
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/**
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* Random nonce used to detect connections to self.
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* @constant {Buffer}
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*/
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randomNonce: bmcrypto.randomBytes(8),
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/**
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* Decode `version` message.
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* NOTE: `nonce` is copied.
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* @param {Buffer} buf - Message
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* @return {DecodeResult}
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* [Decoded `version` structure.]{@link module:bitmessage/messages.version.DecodeResult}
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*/
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decode: function(buf) {
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var decoded = message.decode(buf);
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assert(decoded.command === "version", "Bad command");
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return version.decodePayload(decoded.payload);
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},
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/**
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* Decode `version` message payload.
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* The same as [decode]{@link module:bitmessage/messages.version.decode}.
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*/
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decodePayload: function(buf) {
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// 4 + 8 + 8 + 26 + 26 + 8 + (1+) + (1+)
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assert(buf.length >= 82, "Buffer is too small");
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var protoVersion = buf.readUInt32BE(0, true);
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var services = ServicesBitfield(buf.slice(4, 12), {copy: true});
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var time = util.readTime64BE(buf, 12);
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var short = {short: true};
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var addrRecv = structs.net_addr.decode(buf.slice(20, 46), short);
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var addrFrom = structs.net_addr.decode(buf.slice(46, 72), short);
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var nonce = new Buffer(8);
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buf.copy(nonce, 0, 72, 80);
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var decodedUa = UserAgent.decode(buf.slice(80));
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assert(decodedUa.length <= 5000, "User agent is too long");
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var decodedStreams = structs.var_int_list.decode(decodedUa.rest);
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assert(decodedStreams.list.length <= 160000, "Too many streams");
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return {
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protoVersion: protoVersion,
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services: services,
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time: time,
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remoteHost: addrRecv.host,
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remotePort: addrRecv.port,
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port: addrFrom.port,
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nonce: nonce,
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userAgent: decodedUa.str,
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streams: decodedStreams.list,
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// NOTE(Kagami): Real data length. It may be some gap between end
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// of stream numbers list and end of payload:
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// [payload..............[stream numbers]xxxx]
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// We are currently ignoring that.
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length: 80 + decodedUa.length + decodedStreams.length,
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};
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},
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/**
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* Encode `version` message.
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* @param {Object} opts - Version options
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* @param {Object=} opts.services -
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* [Service]{@link module:bitmessage/structs.ServicesBitfield}
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* features to be enabled for this connection (`NODE_NETWORK` by
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* default)
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* @param {Date=} opts.time - Node time (current time by default)
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* @param {string} opts.remoteHost - IPv4/IPv6 address of the node
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* receiving this message
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* @param {number} opts.remotePort - Port of the node receiving this
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* message
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* @param {number=} opts.port - Incoming port of the node (8444 by
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* default)
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* @param {Buffer=} opts.nonce - An 8-byte random nonce used to detect
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* connection to self (unique per node.js process by default)
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* @param {(Array|string|Buffer)=} opts.userAgent -
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* [User agent]{@link module:bitmessage/user-agent} of the node
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* (user agent of bitmessage library by default)
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* @param {Array<number>=} opts.streams - Streams accepted by the node
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* ([1] by default)
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* @return {Buffer} Encoded message.
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*/
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encode: function(opts) {
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var payload = version.encodePayload(opts);
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return message.encode("version", payload);
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},
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/**
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* Encode `version` message payload.
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* The same as [encode]{@link module:bitmessage/messages.version.encode}.
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*/
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encodePayload: function(opts) {
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// Deal with default options.
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var services = opts.services ||
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ServicesBitfield().set(ServicesBitfield.NODE_NETWORK);
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var time = opts.time || new Date();
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var nonce = opts.nonce || version.randomNonce;
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assert(nonce.length === 8, "Bad nonce");
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var port = opts.port || 8444;
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var userAgent = UserAgent.encode(opts.userAgent || UserAgent.SELF);
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assert(userAgent.length <= 5000, "User agent is too long");
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var streams = opts.streams || [1];
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assert(streams.length <= 160000, "Too many streams");
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// Start encoding.
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var protoVersion = new Buffer(4);
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protoVersion.writeUInt32BE(util.PROTOCOL_VERSION, 0);
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var addrRecv = structs.net_addr.encode({
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services: services,
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host: opts.remoteHost,
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port: opts.remotePort,
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short: true,
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});
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var addrFrom = structs.net_addr.encode({
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services: services,
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host: "127.0.0.1",
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port: port,
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short: true,
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});
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return Buffer.concat([
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protoVersion,
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services.buffer,
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util.writeTime64BE(null, time),
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addrRecv,
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addrFrom,
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nonce,
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userAgent,
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structs.var_int_list.encode(streams),
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]);
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},
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};
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var IPv6_LOOPBACK = new Buffer(
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[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]
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);
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// Check whether given encoded IPv6 or IPv4-mapped IPv6 is in private
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// network range. See
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// <https://en.wikipedia.org/wiki/Reserved_IP_addresses> for details.
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// TODO(Kagami): Do we also need to filter multicasts and other reserved
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// ranges?
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function isPrivateIp(buf) {
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// IPv4.
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if (bufferEqual(buf.slice(0, 12), IPv4_MAPPING)) {
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buf = buf.slice(12);
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if (buf[0] === 127) {
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return true;
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} else if (buf[0] === 10) {
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return true;
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} else if (buf[0] === 192 && buf[1] === 168) {
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return true;
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// XXX(Kagami): ignore:start and ignore:end doesn't ignore this for
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// some reason. Probably related:
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// <https://github.com/jshint/jshint/issues/1465>.
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} else if (buf[0] === 172 && (buf[1] & 0xf0) === 0x10) {//jshint ignore:line
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return true;
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} else if (buf[0] === 169 && buf[1] === 254) {
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return true;
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} else {
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return false;
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}
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// IPv6.
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} else {
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if (bufferEqual(buf, IPv6_LOOPBACK)) {
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return true;
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} else if (buf[0] === 0xfe && (buf[1] & 0xc0) === 0x80) {//jshint ignore:line
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return true;
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} else if ((buf[0] & 0xfe) === 0xfc) { // jshint ignore:line
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return true;
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} else {
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return false;
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}
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}
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}
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// Helper to make it easier to filter out private IPs.
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function checkAddrOpts(opts) {
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return !isPrivateIp(inet_pton(opts.host));
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}
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/**
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* `addr` message. Provide information on known nodes of the network.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#addr}
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* @namespace
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* @static
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*/
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var addr = exports.addr = {
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/**
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* @typedef {Object} DecodeResult
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* @property {Object[]} addrs - List of
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* [decoded `net_addr` structures]{@link module:bitmessage/structs.net_addr.DecodeResult}
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* @property {number} length - Real data length
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* @memberof module:bitmessage/messages.addr
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*/
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/**
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* Decode `addr` message.
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* @param {Buffer} buf - Message
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* @return {DecodeResult}
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* [Decoded `addr` structure.]{@link module:bitmessage/messages.addr.DecodeResult}
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*/
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decode: function(buf) {
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var decoded = message.decode(buf);
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assert(decoded.command === "addr", "Bad command");
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return addr.decodePayload(decoded.payload);
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},
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/**
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* Decode `addr` message payload.
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* The same as [decode]{@link module:bitmessage/messages.addr.decode}.
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*/
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decodePayload: function(buf) {
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var decoded = structs.var_int.decode(buf);
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var listLength = decoded.value;
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// NOTE(Kagami): Check length before filtering private IPs because
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// we shouldn't even receive them.
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assert(listLength <= 1000, "Too many address entires");
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var length = decoded.length + listLength * 38;
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assert(buf.length >= length, "Buffer is too small");
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var rest = decoded.rest;
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var addrs = [];
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var addrBuf;
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for (var i = 0; i < listLength; i++) {
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addrBuf = rest.slice(i*38, (i+1)*38);
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if (!isPrivateIp(addrBuf.slice(20, 36))) {
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addrs.push(structs.net_addr.decode(addrBuf));
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}
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}
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return {
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addrs: addrs,
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// Real data length.
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length: length,
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};
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},
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/**
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* Encode `addr` message.
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* @param {Object[]} addrs - List of
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* [net_addr encode options]{@link module:bitmessage/structs.net_addr.encode}
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* @return {Buffer} Encoded message.
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*/
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encode: function(addrs) {
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var payload = addr.encodePayload(addrs);
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return message.encode("addr", payload);
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},
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/**
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* Encode `addr` message payload.
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* The same as [encode]{@link module:bitmessage/messages.addr.encode}.
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*/
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encodePayload: function(addrs) {
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addrs = addrs.filter(checkAddrOpts);
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assert(addrs.length <= 1000, "Too many address entires");
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var addrBufs = addrs.map(structs.net_addr.encode);
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var bufs = [structs.var_int.encode(addrs.length)].concat(addrBufs);
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return Buffer.concat(bufs);
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},
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};
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/**
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* `inv` message. Allows a node to advertise its knowledge of one or
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* more objects.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#inv}
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* @namespace
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* @static
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*/
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var inv = exports.inv = {
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/**
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* @typedef {Object} DecodeResult
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* @property {Buffer[]} inventory - List of
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* [inventory vectors]{@link module:bitmessage/structs.inv_vect}
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* @property {number} length - Real data length
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* @memberof module:bitmessage/messages.inv
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*/
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/**
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* Decode `inv` message.
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* @param {Buffer} buf - Message
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* @return {DecodeResult}
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* [Decoded `inv` structure.]{@link module:bitmessage/messages.inv.DecodeResult}
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*/
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decode: function(buf) {
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var decoded = message.decode(buf);
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assert(decoded.command === "inv", "Bad command");
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return inv.decodePayload(decoded.payload);
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},
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/**
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* Decode `inv` message payload.
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* The same as [decode]{@link module:bitmessage/messages.inv.decode}.
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*/
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decodePayload: function(buf) {
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var decoded = structs.var_int.decode(buf);
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var listLength = decoded.value;
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assert(listLength <= 50000, "Too many inventory entires");
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var length = decoded.length + listLength * 32;
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assert(buf.length >= length, "Buffer is too small");
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var rest = decoded.rest;
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var inventory = new Array(listLength);
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for (var i = 0; i < listLength; i++) {
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inventory[i] = rest.slice(i*32, (i+1)*32);
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}
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return {
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inventory: inventory,
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// Real data length.
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length: length,
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};
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},
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/**
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* Encode `inv` message.
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* @param {Buffer[]} inventory -
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* [Inventory vector]{@link module:bitmessage/structs.inv_vect} list
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* @return {Buffer} Encoded message.
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*/
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encode: function(inventory) {
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var payload = inv.encodePayload(inventory);
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return message.encode("inv", payload);
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},
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/**
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* Encode `inv` message payload.
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* The same as [encode]{@link module:bitmessage/messages.inv.encode}.
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*/
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encodePayload: function(inventory) {
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assert(inventory.length <= 50000, "Too many inventory entires");
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// TODO(Kagami): Validate vectors length.
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var bufs = [structs.var_int.encode(inventory.length)].concat(inventory);
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return Buffer.concat(bufs);
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},
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};
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/**
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* `getdata` message. `getdata` is used in response to an
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* [inv]{@link module:bitmessage/messages.inv} message to retrieve the
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* content of a specific object after filtering known elements.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#getdata}
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* @namespace
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*/
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exports.getdata = objectAssign({}, inv, {
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/**
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* @typedef {Object} DecodeResult
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* @property {Buffer[]} inventory - List of
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* [inventory vectors]{@link module:bitmessage/structs.inv_vect}
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* @property {number} length - Real data length
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* @memberof module:bitmessage/messages.getdata
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*/
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/**
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* Decode `getdata` message.
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* @param {Buffer} buf - Message
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* @return {DecodeResult}
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* [Decoded `getdata` structure.]{@link module:bitmessage/messages.getdata.DecodeResult}
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* @memberof module:bitmessage/messages.getdata
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*/
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decode: function(buf) {
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var decoded = message.decode(buf);
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assert(decoded.command === "getdata", "Bad command");
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return inv.decodePayload(decoded.payload);
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},
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/**
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* Decode `getdata` message payload.
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* The same as [decode]{@link module:bitmessage/messages.getdata.decode}.
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* @function decodePayload
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* @memberof module:bitmessage/messages.getdata
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*/
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/**
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* Encode `getdata` message.
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* @param {Buffer[]} inventory -
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* [Inventory vector]{@link module:bitmessage/structs.inv_vect} list
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* @return {Buffer} Encoded message.
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* @memberof module:bitmessage/messages.getdata
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*/
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encode: function(inventory) {
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var payload = inv.encodePayload(inventory);
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return message.encode("getdata", payload);
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},
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/**
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* Encode `getdata` message payload.
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* The same as [encode]{@link module:bitmessage/messages.getdata.encode}.
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* @function encodePayload
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* @memberof module:bitmessage/messages.getdata
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*/
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});
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/**
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* `error` message.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification_v3#error}
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* @namespace
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* @static
|
|
*/
|
|
var error = exports.error = {
|
|
/**
|
|
* Just a warning.
|
|
* @constant {number}
|
|
*/
|
|
WARNING: 0,
|
|
|
|
/**
|
|
* It's an error, something was going wrong (e.g. an object got lost).
|
|
* @constant {number}
|
|
*/
|
|
ERROR: 1,
|
|
|
|
/**
|
|
* It's a fatal error. The node will drop the line for that error and
|
|
* maybe ban you for some time.
|
|
* @constant {number}
|
|
*/
|
|
FATAL: 2,
|
|
|
|
/**
|
|
* Convert error type to a human-readable string.
|
|
* @param {number} type - Type of the error
|
|
* @return {string}
|
|
*/
|
|
type2str: function(type) {
|
|
switch (type) {
|
|
case error.WARNING: return "warning";
|
|
case error.ERROR: return "error";
|
|
case error.FATAL: return "fatal";
|
|
default: return "unknown";
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @typedef {Object} DecodeResult
|
|
* @property {number} type - Type of the error
|
|
* @property {number} banTime - The other node informs that it will
|
|
* not accept further connections for this number of seconds
|
|
* @property {?Buffer} vector -
|
|
* [Inventory vector]{@link module:bitmessage/structs.inv_vect}
|
|
* related to the error
|
|
* @property {string} errorText - A human-readable error description
|
|
* @property {number} length - Real data length
|
|
* @memberof module:bitmessage/messages.error
|
|
*/
|
|
|
|
/**
|
|
* Decode `error` message.
|
|
* @param {Buffer} buf - Message
|
|
* @return {DecodeResult}
|
|
* [Decoded `error` structure.]{@link module:bitmessage/messages.error.DecodeResult}
|
|
*/
|
|
decode: function(buf) {
|
|
var decoded = message.decode(buf);
|
|
assert(decoded.command === "error", "Bad command");
|
|
return error.decodePayload(decoded.payload);
|
|
},
|
|
|
|
/**
|
|
* Decode `error` message payload.
|
|
* The same as [decode]{@link module:bitmessage/messages.error.decode}.
|
|
*/
|
|
decodePayload: function(buf) {
|
|
assert(buf.length >= 4, "Buffer is too small");
|
|
var decodedType = structs.var_int.decode(buf);
|
|
var decodedBanTime = structs.var_int.decode(decodedType.rest);
|
|
|
|
var decodedVectorLength = structs.var_int.decode(decodedBanTime.rest);
|
|
// NOTE(Kagami): Inventory vector should be only 32-byte in size but
|
|
// currently we don't ensure it.
|
|
var vectorLength = decodedVectorLength.value;
|
|
var rest = decodedVectorLength.rest;
|
|
assert(rest.length >= vectorLength, "Buffer is too small");
|
|
var vector = null;
|
|
if (vectorLength) {
|
|
vector = new Buffer(vectorLength);
|
|
rest.copy(vector);
|
|
rest = rest.slice(vectorLength);
|
|
}
|
|
|
|
var decodedErrorText = structs.var_str.decode(rest);
|
|
var length = (
|
|
decodedType.length +
|
|
decodedBanTime.length +
|
|
decodedVectorLength.length + vectorLength +
|
|
decodedErrorText.length
|
|
);
|
|
return {
|
|
type: decodedType.value,
|
|
banTime: decodedBanTime.value,
|
|
vector: vector,
|
|
errorText: decodedErrorText.str,
|
|
// Real data length.
|
|
length: length,
|
|
};
|
|
},
|
|
|
|
/**
|
|
* Encode `error` message.
|
|
* @param {Object} opts - Error options
|
|
* @param {number=} opts.type - Type of the error
|
|
* ([warning]{@link module:bitmessage/messages.error.WARNING} by
|
|
* default)
|
|
* @param {number=} opts.banTime - Inform the other node, that you
|
|
* will not accept further connections for this number of seconds (0
|
|
* by default)
|
|
* @param {Buffer=} opts.vector - A 32-byte
|
|
* [inventory vector]{@link module:bitmessage/structs.inv_vect}
|
|
* related to the error (empty by default)
|
|
* @param {string} opts.errorText - A human-readable error description
|
|
* @return {Buffer} Encoded message.
|
|
*/
|
|
encode: function(opts) {
|
|
var payload = error.encodePayload(opts);
|
|
return message.encode("error", payload);
|
|
},
|
|
|
|
/**
|
|
* Encode `error` message payload.
|
|
* The same as [encode]{@link module:bitmessage/messages.error.encode}.
|
|
*/
|
|
encodePayload: function(opts) {
|
|
var type = opts.type || error.WARNING;
|
|
var banTime = opts.banTime || 0;
|
|
// TODO(Kagami): Validate vector length.
|
|
var vector = opts.vector || new Buffer(0);
|
|
return Buffer.concat([
|
|
structs.var_int.encode(type),
|
|
structs.var_int.encode(banTime),
|
|
structs.var_int.encode(vector.length),
|
|
vector,
|
|
structs.var_str.encode(opts.errorText),
|
|
]);
|
|
},
|
|
};
|