680 lines
21 KiB
JavaScript
680 lines
21 KiB
JavaScript
/**
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* Implements common structures.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#Common_structures}
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* @module bitmessage/structs
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*/
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// TODO(Kagami): Document object-like params.
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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 bmcrypto = require("./crypto");
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var POW = require("./pow");
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var util = require("./_util");
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function isAscii(str) {
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for (var i = 0; i < str.length; i++) {
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if (str.charCodeAt(i) > 127) {
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return false;
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}
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}
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return true;
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}
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// Compute the message checksum for the given data.
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function getmsgchecksum(data) {
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return bmcrypto.sha512(data).slice(0, 4);
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}
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/**
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* Message structure.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#Message_structure}
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* @namespace
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* @static
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*/
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var message = exports.message = {
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/** Bitmessage magic value. */
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MAGIC: 0xE9BEB4D9,
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/**
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* Decode message structure.
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* NOTE: `payload` is copied, `rest` references input buffer.
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* @param {Buffer} buf - Buffer that starts with encoded message
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* @return {{command: string, payload: Buffer, length: number, rest: Buffer}}
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* Decoded message structure.
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*/
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decode: function(buf) {
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assert(buf.length >= 24, "Buffer is too small");
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assert(buf.readUInt32BE(0, true) === message.MAGIC, "Wrong magic");
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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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assert(command[i] <= 127, "Non-ASCII characters in command");
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if (!firstNonNull && command[i] !== 0) {
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firstNonNull = i + 1;
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}
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}
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// NOTE(Kagami): Command can be empty.
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// NOTE(Kagami): "ascii" encoding is not necessary here since we
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// already validated the command but that should be quite faster
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// than default "utf-8" encoding.
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command = command.slice(0, firstNonNull).toString("ascii");
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var payloadLength = buf.readUInt32BE(16, true);
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var length = 24 + payloadLength;
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assert(buf.length >= length, "Truncated payload");
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var checksum = buf.slice(20, 24);
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// NOTE(Kagami): We do copy instead of slice to protect against
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// possible source buffer modification by user.
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var payload = new Buffer(payloadLength);
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buf.copy(payload, 0, 24, length);
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assert(bufferEqual(checksum, getmsgchecksum(payload)), "Bad checksum");
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var rest = buf.slice(length);
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return {command: command, payload: payload, length: length, rest: rest};
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},
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/**
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* Encode message structure.
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* @param {string} command - Message command
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* @param {Bufer} payload - Message payload
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* @return {Buffer} Encoded message structure.
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*/
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encode: function(command, payload) {
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assert(command.length <= 12, "Command is too long");
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assert(isAscii(command), "Non-ASCII characters in command");
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var buf = new Buffer(24 + payload.length);
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buf.fill(0);
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buf.writeUInt32BE(message.MAGIC, 0, true);
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buf.write(command, 4);
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buf.writeUInt32BE(payload.length, 16, true);
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getmsgchecksum(payload).copy(buf, 20);
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payload.copy(buf, 24);
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return buf;
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},
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};
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/**
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* `object` message. An `object` is a message which is shared throughout
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* a stream. It is the only message which propagates; all others are
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* only between two nodes.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#object}
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* @namespace
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* @static
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*/
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var object = exports.object = {
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// Known types.
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GETPUBKEY: 0,
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PUBKEY: 1,
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MSG: 2,
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BROADCAST: 3,
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/**
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* Decode `object` message.
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* NOTE: `nonce` and `objectPayload` are copied.
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* @param {Buffer} buf - Message
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* @param {?Object} opts - Decoding options
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* @return {Object} Decoded `object` structure.
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*/
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decode: function(buf, opts) {
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var decoded = message.decode(buf);
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assert(decoded.command === "object", "Bad command");
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return object.decodePayload(decoded.payload, opts);
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},
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/**
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* Decode `object` message payload.
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* NOTE: `nonce` and `objectPayload` are copied.
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* @param {Buffer} buf - Message payload
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* @param {?Object} opts - Decoding options
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* @return {Object} Decoded `object` structure.
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*/
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decodePayload: function(buf, opts) {
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opts = opts || {};
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// 8 + 8 + 4 + (1+) + (1+)
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assert(buf.length >= 22, "object message payload is too small");
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assert(buf.length <= 262144, "object message payload is too big");
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var nonce = new Buffer(8);
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buf.copy(nonce, 0, 0, 8);
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// TTL.
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var expiresTime = util.readTimestamp64BE(buf.slice(8, 16));
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var ttl = expiresTime - util.tnow();
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assert(ttl <= 2430000, "expiresTime is too far in the future");
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if (!opts.allowExpired) {
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assert(ttl >= -3600, "Object expired more than a hour ago");
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}
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// POW.
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if (!opts.skipPow) {
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// User may specify trials/payload extra options and we will
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// account in here.
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var targetOpts = objectAssign({}, opts, {ttl: ttl, payload: buf});
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var target = POW.getTarget(targetOpts);
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assert(POW.check({target: target, payload: buf}), "Insufficient POW");
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}
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var type = buf.readUInt32BE(16, true);
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var decodedVersion = var_int.decode(buf.slice(20));
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var decodedStream = var_int.decode(decodedVersion.rest);
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var headerLength = 20 + decodedVersion.length + decodedStream.length;
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var objectPayload = new Buffer(decodedStream.rest.length);
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decodedStream.rest.copy(objectPayload);
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return {
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nonce: nonce,
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ttl: ttl,
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type: type,
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version: decodedVersion.value,
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stream: decodedStream.value,
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headerLength: headerLength,
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objectPayload: objectPayload,
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};
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},
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/**
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* Encode `object` message.
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* @param {Object} opts - Object options
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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 = object.encodePayload(opts);
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return message.encode("object", payload);
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},
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/**
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* Encode `object` message payload.
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* @param {Object} opts - Object options
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* @return {Buffer} Encoded payload.
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*/
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encodePayload: function(opts) {
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assert(opts.nonce.length === 8, "Bad nonce");
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// NOTE(Kagami): This may be a bit inefficient since we allocate
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// twice.
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return Buffer.concat([
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opts.nonce,
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object.encodePayloadWithoutNonce(opts),
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]);
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},
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/**
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* Encode `object` message payload without leading nonce field (may be
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* useful if you are going to calculate it later).
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* @param {Object} opts - Object options
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* @return {Buffer} Encoded payload.
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*/
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encodePayloadWithoutNonce: function(opts) {
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assert(opts.ttl > 0, "Bad TTL");
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assert(opts.ttl <= 2430000, "TTL may not be larger than 28 days + 3 hours");
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var expiresTime = util.tnow() + opts.ttl;
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var type = new Buffer(4);
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type.writeUInt32BE(opts.type, 0);
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var stream = opts.stream || 1;
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var obj = Buffer.concat([
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util.writeUInt64BE(null, expiresTime),
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type,
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var_int.encode(opts.version),
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var_int.encode(stream),
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opts.objectPayload,
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]);
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assert(obj.length <= 262136, "object message payload is too big");
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return obj;
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},
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};
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/**
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* Variable length integer.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#Variable_length_integer}
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* @namespace
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* @static
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*/
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var var_int = exports.var_int = {
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/**
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* Decode `var_int`.
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* NOTE: `rest` references input buffer.
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* @param {Buffer} buf - A buffer that starts with encoded `var_int`
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* @return {{value: number, length: number, rest: Buffer}}
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* Decoded `var_int` structure.
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*/
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decode: function(buf) {
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var value, length;
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assert(buf.length > 0, "Empty buffer");
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switch (buf[0]) {
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case 253:
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value = buf.readUInt16BE(1);
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assert(value >= 253, "Impractical var_int");
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length = 3;
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break;
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case 254:
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value = buf.readUInt32BE(1);
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assert(value >= 65536, "Impractical var_int");
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length = 5;
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break;
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case 255:
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var hi = buf.readUInt32BE(1);
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assert(hi !== 0, "Impractical var_int");
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// Max safe number = 2^53 - 1 =
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// 0b0000000000011111111111111111111111111111111111111111111111111111
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// = 2097151*(2^32) + (2^32 - 1).
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// So it's safe until hi <= 2097151. See
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// <http://mdn.io/issafeinteger>,
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// <https://stackoverflow.com/q/307179> for details.
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// TODO(Kagami): We may want to return raw Buffer for
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// 2^53 <= value <= 2^64 - 1 range. Probably using the optional
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// argument because most of the code expect to get a number when
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// calling `var_int.decode`.
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assert(hi <= 2097151, "Unsafe integer");
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var lo = buf.readUInt32BE(5);
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value = hi * 4294967296 + lo;
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length = 9;
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break;
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default:
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value = buf[0];
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length = 1;
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}
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var rest = buf.slice(length);
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return {value: value, length: length, rest: rest};
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},
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/**
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* Encode number into `var_int`.
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* @param {(number|Buffer)} value - Input number
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* @return {Buffer} Encoded `var_int`.
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*/
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encode: function(value) {
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var buf, targetStart;
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if (typeof value === "number") {
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assert(value >= 0, "Value cannot be less than zero");
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if (value < 253) {
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buf = new Buffer([value]);
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} else if (value < 65536) {
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buf = new Buffer(3);
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buf[0] = 253;
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buf.writeUInt16BE(value, 1, true);
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} else if (value < 4294967296) {
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buf = new Buffer(5);
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buf[0] = 254;
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buf.writeUInt32BE(value, 1, true);
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} else {
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assert(value <= 9007199254740991, "Unsafe integer");
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buf = new Buffer(9);
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buf[0] = 255;
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buf.writeUInt32BE(Math.floor(value / 4294967296), 1, true); // high32
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buf.writeUInt32BE(value % 4294967296, 5, true); // low32
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}
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} else if (Buffer.isBuffer(value)) {
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assert(value.length <= 8, "Buffer is too big");
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buf = new Buffer(9);
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buf.fill(0);
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buf[0] = 255;
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targetStart = 1 + (8 - value.length);
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value.copy(buf, targetStart);
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} else {
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throw new Error("Unknown value type");
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}
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return buf;
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},
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};
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/**
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* Variable length string.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#Variable_length_string}
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* @namespace
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*/
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exports.var_str = {
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/**
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* Decode `var_str`.
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* NOTE: `rest` references input buffer.
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* @param {Buffer} buf - A buffer that starts with encoded `var_str`
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* @return {{str: string, length: number, rest: Buffer}}
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* Decoded `var_str` structure.
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*/
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decode: function(buf) {
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var decoded = var_int.decode(buf);
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var strLength = decoded.value;
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var length = decoded.length + strLength;
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assert(buf.length >= length, "Buffer is too small");
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// XXX(Kagami): Spec doesn't mention encoding, using UTF-8.
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var str = decoded.rest.slice(0, strLength).toString("utf8");
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var rest = decoded.rest.slice(strLength);
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return {str: str, length: length, rest: rest};
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},
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/**
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* Encode string into `var_str`.
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* @param {string} str - A string
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* @return {Buffer} Encoded `var_str`.
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*/
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encode: function(str) {
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// XXX(Kagami): Spec doesn't mention encoding, using UTF-8.
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var strBuf = new Buffer(str, "utf8");
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return Buffer.concat([var_int.encode(strBuf.length), strBuf]);
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},
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};
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/**
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* Variable length list of integers.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#Variable_length_list_of_integers}
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* @namespace
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*/
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exports.var_int_list = {
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/**
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* Decode `var_int_list`.
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* NOTE: `rest` references input buffer.
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* @param {Buffer} buf - A buffer that starts with encoded
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* `var_int_list`
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* @return {{list: number[], length: number, rest: Buffer}}
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* Decoded `var_int_list` structure.
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*/
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decode: function(buf) {
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var decoded = var_int.decode(buf);
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var listLength = decoded.value;
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var list = new Array(listLength);
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var rest = decoded.rest;
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var sumLength = decoded.length;
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for (var i = 0; i < listLength; i++) {
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decoded = var_int.decode(rest);
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list[i] = decoded.value;
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rest = decoded.rest;
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sumLength += decoded.length;
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}
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return {list: list, length: sumLength, rest: rest};
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},
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/**
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* Encode list of numbers into `var_int_list`.
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* @param {number[]} list - A number list
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* @return {Buffer} Encoded `var_int_list`.
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*/
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encode: function(list) {
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var listBuf = Buffer.concat(list.map(var_int.encode));
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return Buffer.concat([var_int.encode(list.length), listBuf]);
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},
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};
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// See https://en.wikipedia.org/wiki/IPv6#IPv4-mapped_IPv6_addresses
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var IPv4_MAPPING = new Buffer([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255]);
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// Very simple inet_ntop(3) equivalent.
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function inet_ntop(buf) {
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assert(buf.length === 16, "Bad buffer size");
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// IPv4 mapped to IPv6.
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if (bufferEqual(buf.slice(0, 12), IPv4_MAPPING)) {
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return Array.prototype.join.call(buf.slice(12), ".");
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// IPv6.
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} else {
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var groups = [];
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for (var i = 0; i < 8; i++) {
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groups.push(buf.readUInt16BE(i * 2, true).toString(16));
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}
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return groups.join(":");
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}
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}
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// Very simple inet_pton(3) equivalent.
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function inet_pton(str) {
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var buf = new Buffer(16);
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buf.fill(0);
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// IPv4.
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if (str.indexOf(":") === -1) {
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IPv4_MAPPING.copy(buf);
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var octets = str.split(/\./g).map(function(s) {return parseInt(s, 10);});
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// Support short form from inet_aton(3) man page.
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if (octets.length === 1) {
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buf.writeUInt32BE(octets[0], 12);
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} else {
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// Check against 1000.bad.addr
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octets.forEach(function(octet) {
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assert(octet >= 0, "Bad IPv4 address");
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assert(octet <= 255, "Bad IPv4 address");
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});
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if (octets.length === 2) {
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buf[12] = octets[0];
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buf[15] = octets[1];
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} else if (octets.length === 3) {
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buf[12] = octets[0];
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buf[13] = octets[1];
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buf[15] = octets[2];
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} else if (octets.length === 4) {
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buf[12] = octets[0];
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buf[13] = octets[1];
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buf[14] = octets[2];
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buf[15] = octets[3];
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} else {
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throw new Error("Bad IPv4 address");
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}
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}
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// IPv6.
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} else {
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var dgroups = str.split(/::/g);
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// Check against 1::1::1
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assert(dgroups.length <= 2, "Bad IPv6 address");
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var groups = [];
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var i;
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if (dgroups[0]) {
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groups.push.apply(groups, dgroups[0].split(/:/g));
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}
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if (dgroups.length === 2) {
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if (dgroups[1]) {
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var splitted = dgroups[1].split(/:/g);
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var fill = 8 - (groups.length + splitted.length);
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// Check against 1:1:1:1::1:1:1:1
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assert(fill > 0, "Bad IPv6 address");
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for (i = 0; i < fill; i++) {
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groups.push(0);
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}
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groups.push.apply(groups, splitted);
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} else {
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// Check against 1:1:1:1:1:1:1:1::
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assert(groups.length <= 7, "Bad IPv6 address");
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}
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} else {
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// Check against 1:1:1
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assert(groups.length === 8, "Bad IPv6 address");
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}
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for (i = 0; i < Math.min(groups.length, 8); i++) {
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buf.writeUInt16BE(parseInt(groups[i], 16), i * 2);
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}
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}
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return buf;
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}
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/**
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* Network address.
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* @see {@link https://bitmessage.org/wiki/Protocol_specification#Network_address}
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* @namespace
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*/
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exports.net_addr = {
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/**
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* Decode `net_addr`.
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* @param {Buffer} buf - A buffer that contains encoded `net_addr`
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* @param {?Object} opts - Decode options
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* @return {Object} Decoded `net_addr` structure.
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*/
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decode: function(buf, opts) {
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var short = !!(opts || {}).short;
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var res = {};
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if (short) {
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assert(buf.length === 26, "Bad buffer size");
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} else {
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assert(buf.length === 38, "Bad buffer size");
|
|
var timeHi = buf.readUInt32BE(0, true);
|
|
var timeLo = buf.readUInt32BE(4, true);
|
|
// JavaScript's Date object can't work with timestamps higher than
|
|
// 8640000000000 (~2^43, ~275760 year). Hope JavaScript will
|
|
// support 64-bit numbers up to this date.
|
|
assert(timeHi <= 2011, "Time is too high");
|
|
assert(timeHi !== 2011 || timeLo <= 2820767744, "Time is too high");
|
|
res.time = new Date((timeHi * 4294967296 + timeLo) * 1000);
|
|
res.stream = buf.readUInt32BE(8, true);
|
|
buf = buf.slice(12);
|
|
}
|
|
res.services = ServicesBitfield(buf.slice(0, 8), {copy: true});
|
|
res.host = inet_ntop(buf.slice(8, 24));
|
|
res.port = buf.readUInt16BE(24, true);
|
|
return res;
|
|
},
|
|
|
|
/**
|
|
* Encode `net_addr`.
|
|
* @param {Object} opts - Encode options; use `short` option to encode
|
|
* `net_addr` used in version message
|
|
* @return {Buffer} Encoded `net_addr`.
|
|
*/
|
|
encode: function(opts) {
|
|
// Be aware of `Buffer.slice` quirk in browserify:
|
|
// <http://git.io/lNZF1A> (does not modify parent buffer's memory in
|
|
// old browsers). So we use offset instead of `buf = buf.slice`.
|
|
var buf, shift;
|
|
if (opts.short) {
|
|
buf = new Buffer(26);
|
|
shift = 0;
|
|
} else {
|
|
buf = new Buffer(38);
|
|
var time = opts.time || new Date();
|
|
time = Math.floor(time.getTime() / 1000);
|
|
buf.writeUInt32BE(Math.floor(time / 4294967296), 0, true); // high32
|
|
buf.writeUInt32BE(time % 4294967296, 4, true); // low32
|
|
var stream = opts.stream || 1;
|
|
buf.writeUInt32BE(stream, 8);
|
|
shift = 12;
|
|
}
|
|
var services = opts.services ||
|
|
ServicesBitfield().set(ServicesBitfield.NODE_NETWORK);
|
|
services.buffer.copy(buf, shift);
|
|
inet_pton(opts.host).copy(buf, shift + 8);
|
|
buf.writeUInt16BE(opts.port, shift + 24);
|
|
return buf;
|
|
},
|
|
};
|
|
|
|
/**
|
|
* Inventory vector.
|
|
* @see {@link https://bitmessage.org/wiki/Protocol_specification#Inventory_Vectors}
|
|
* @namespace
|
|
*/
|
|
// Only encode operation is defined because decode is impossible.
|
|
exports.inv_vect = {
|
|
/**
|
|
* Encode inventory vector.
|
|
* @param {Buffer} buf - Payload to calculate inventory vector for
|
|
* @return {Buffer} Encoded `inv_vect`.
|
|
*/
|
|
encode: function(buf) {
|
|
return bmcrypto.sha512(bmcrypto.sha512(buf)).slice(0, 32);
|
|
},
|
|
};
|
|
|
|
/**
|
|
* Encrypted payload.
|
|
* @see {@link https://bitmessage.org/wiki/Protocol_specification#Encrypted_payload}
|
|
* @namespace encrypted
|
|
*/
|
|
/**
|
|
* Decode encrypted payload.
|
|
* NOTE: all structure members are copied.
|
|
* @param {Buffer} buf - A buffer that contains encrypted payload
|
|
* @return {Object} Decoded encrypted structure.
|
|
* @function encrypted.decode
|
|
*/
|
|
/**
|
|
* Encode `encrypted`.
|
|
* @param {Object} opts - Encode options
|
|
* @return {Buffer} Encoded encrypted payload.
|
|
* @function encrypted.encode
|
|
*/
|
|
// Reexport struct.
|
|
exports.encrypted = bmcrypto.encrypted;
|
|
|
|
// Creates bitfield (MSB 0) class of the specified size.
|
|
var Bitfield = function(size) {
|
|
var bytesize = size / 8;
|
|
|
|
// Inspired by <https://github.com/fb55/bitfield>.
|
|
function BitfieldInner(buf, opts) {
|
|
if (!(this instanceof BitfieldInner)) {
|
|
return new BitfieldInner(buf);
|
|
}
|
|
opts = opts || {};
|
|
if (buf) {
|
|
assert(buf.length === bytesize, "Bad buffer size");
|
|
if (opts.copy) {
|
|
var dup = new Buffer(bytesize);
|
|
dup.fill(0);
|
|
buf.copy(dup);
|
|
buf = dup;
|
|
}
|
|
} else {
|
|
buf = new Buffer(bytesize);
|
|
buf.fill(0);
|
|
}
|
|
this.buffer = buf;
|
|
}
|
|
|
|
BitfieldInner.prototype.get = function(bits) {
|
|
if (!Array.isArray(bits)) {
|
|
bits = [bits];
|
|
}
|
|
var buf = this.buffer;
|
|
return bits.every(function(bit) {
|
|
assert(bit >= 0, "Bit number is too low");
|
|
assert(bit < size, "Bit number is too high");
|
|
var index = Math.floor(bit / 8);
|
|
var shift = 7 - (bit % 8);
|
|
return (buf[index] & (1 << shift)) !== 0; // jshint ignore:line
|
|
});
|
|
};
|
|
|
|
BitfieldInner.prototype.set = function(bits) {
|
|
if (!Array.isArray(bits)) {
|
|
bits = [bits];
|
|
}
|
|
var buf = this.buffer;
|
|
bits.forEach(function(bit) {
|
|
assert(bit >= 0, "Bit number is too low");
|
|
assert(bit < size, "Bit number is too high");
|
|
var index = Math.floor(bit / 8);
|
|
var shift = 7 - (bit % 8);
|
|
buf[index] |= 1 << shift; // jshint ignore:line
|
|
});
|
|
return this;
|
|
};
|
|
|
|
return BitfieldInner;
|
|
};
|
|
|
|
/**
|
|
* Services bitfield features.
|
|
* @see {@link https://bitmessage.org/wiki/Protocol_specification#version}
|
|
* @namespace
|
|
* @static
|
|
*/
|
|
// TODO(Kagami): Document methods.
|
|
// NOTE(Kagami): Since pubkey bitfield uses MSB 0, we use it here too.
|
|
// See <https://github.com/Bitmessage/PyBitmessage/issues/769> for
|
|
// details.
|
|
var ServicesBitfield = exports.ServicesBitfield = objectAssign(Bitfield(64), {
|
|
/** This is a normal network node. */
|
|
NODE_NETWORK: 63,
|
|
});
|
|
|
|
/**
|
|
* Pubkey bitfield features.
|
|
* @see {@link https://bitmessage.org/wiki/Protocol_specification#Pubkey_bitfield_features}
|
|
* @namespace
|
|
*/
|
|
// TODO(Kagami): Document methods.
|
|
exports.PubkeyBitfield = objectAssign(Bitfield(32), {
|
|
/**
|
|
* Receiving node expects that the RIPE hash encoded in their address
|
|
* preceedes the encrypted message data of msg messages bound for
|
|
* them.
|
|
*/
|
|
INCLUDE_DESTINATION: 30,
|
|
/**
|
|
* If true, the receiving node does send acknowledgements (rather than
|
|
* dropping them).
|
|
*/
|
|
DOES_ACK: 31,
|
|
});
|