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4542× 4542× 3007× 3007× 1535× 4542× 4542× 4542× 188× 188× 4542× 4542× 4542× 4542× 4542× 1× 4542× 1535× 1535× 1535× 1535× 1535× 3007× 307× 2700× 94× 2606× 342× 2264× 2264× 23× 2241× 36× 2205× 27× 2178× 2172× 6× 6× 1× 33× 33× 33× 171× 171× 138× 33× 1× 307× 307× 307× 307× 307× 307× 307× 307× 307× 307× 307× 1× 306× 306× 306× 306× 306× 306× 306× 306× 306× 273× 273× 33× 33× 33× 1× 27× 27× 27× 27× 27× 27× 27× 1× 334× 334× 334× 334× 334× 615× 334× 334× 334× 334× 1× 2816× 2816× 2816× 2816× 2816× 334× 1408× 1408× 1408× 1408× 462× 462× 70× 462× 419× 1408× 123× 1408× 1408× 211× 1408× 301× 1107× 1107× 1113× 334× 1× 94× 94× 94× 94× 94× 1× 342× 342× 342× 342× 342× 342× 336× 336× 336× 336× 336× 336× 342× 1× 23× 23× 23× 23× 23× 23× 1× 36× 36× 1× 2172× 2172× 1× 6× 6× 6× 6× | 'use strict' var parser = exports var transport = require('../../../spdy-transport') var base = transport.protocol.base var utils = base.utils var constants = require('./constants') var assert = require('assert') var util = require('util') var OffsetBuffer = require('obuf') function Parser (options) { base.Parser.call(this, options) this.isServer = options.isServer this.waiting = constants.FRAME_HEADER_SIZE this.state = 'frame-head' this.pendingHeader = null } util.inherits(Parser, base.Parser) parser.create = function create (options) { return new Parser(options) } Parser.prototype.setMaxFrameSize = function setMaxFrameSize (size) { // http2-only } Parser.prototype.setMaxHeaderListSize = function setMaxHeaderListSize (size) { // http2-only } // Only for testing Parser.prototype.skipPreface = function skipPreface () { } Parser.prototype.execute = function execute (buffer, callback) { if (this.state === 'frame-head') { return this.onFrameHead(buffer, callback) } assert(this.state === 'frame-body' && this.pendingHeader !== null) var self = this var header = this.pendingHeader this.pendingHeader = null this.onFrameBody(header, buffer, function (err, frame) { if (err) { return callback(err) } self.state = 'frame-head' self.waiting = constants.FRAME_HEADER_SIZE self.partial = false callback(null, frame) }) } Parser.prototype.executePartial = function executePartial (buffer, callback) { var header = this.pendingHeader Eif (this.window) { this.window.recv.update(-buffer.size) } // DATA frame callback(null, { type: 'DATA', id: header.id, // Partial DATA can't be FIN fin: false, data: buffer.take(buffer.size) }) } Parser.prototype.onFrameHead = function onFrameHead (buffer, callback) { var header = { control: (buffer.peekUInt8() & 0x80) === 0x80, version: null, type: null, id: null, flags: null, length: null } if (header.control) { header.version = buffer.readUInt16BE() & 0x7fff header.type = buffer.readUInt16BE() } else { header.id = buffer.readUInt32BE(0) & 0x7fffffff } header.flags = buffer.readUInt8() header.length = buffer.readUInt24BE() if (this.version === null && header.control) { // TODO(indutny): do ProtocolError here and in the rest of errors Iif (header.version !== 2 && header.version !== 3) { return callback(new Error('Unsupported SPDY version: ' + header.version)) } this.setVersion(header.version) } this.state = 'frame-body' this.waiting = header.length this.pendingHeader = header this.partial = !header.control callback(null, null) } Parser.prototype.onFrameBody = function onFrameBody (header, buffer, callback) { // Data frame if (!header.control) { // Count received bytes Eif (this.window) { this.window.recv.update(-buffer.size) } // No support for compressed DATA Iif ((header.flags & constants.flags.FLAG_COMPRESSED) !== 0) { return callback(new Error('DATA compression not supported')) } Iif (header.id === 0) { return callback(this.error(constants.error.PROTOCOL_ERROR, 'Invalid stream id for DATA')) } return callback(null, { type: 'DATA', id: header.id, fin: (header.flags & constants.flags.FLAG_FIN) !== 0, data: buffer.take(buffer.size) }) } if (header.type === 0x01 || header.type === 0x02) { // SYN_STREAM or SYN_REPLY this.onSynHeadFrame(header.type, header.flags, buffer, callback) } else if (header.type === 0x03) { // RST_STREAM this.onRSTFrame(buffer, callback) } else if (header.type === 0x04) { // SETTINGS this.onSettingsFrame(buffer, callback) } else Iif (header.type === 0x05) { callback(null, { type: 'NOOP' }) } else if (header.type === 0x06) { // PING this.onPingFrame(buffer, callback) } else if (header.type === 0x07) { // GOAWAY this.onGoawayFrame(buffer, callback) } else if (header.type === 0x08) { // HEADERS this.onHeaderFrames(buffer, callback) } else if (header.type === 0x09) { // WINDOW_UPDATE this.onWindowUpdateFrame(buffer, callback) } else Eif (header.type === 0xf000) { // X-FORWARDED this.onXForwardedFrame(buffer, callback) } else { callback(null, { type: 'unknown: ' + header.type }) } } Parser.prototype._filterHeader = function _filterHeader (headers, name) { var res = {} var keys = Object.keys(headers) for (var i = 0; i < keys.length; i++) { var key = keys[i] if (key !== name) { res[key] = headers[key] } } return res } Parser.prototype.onSynHeadFrame = function onSynHeadFrame (type, flags, body, callback) { var self = this var stream = type === 0x01 var offset = stream ? 10 : this.version === 2 ? 6 : 4 Iif (!body.has(offset)) { return callback(new Error('SynHead OOB')) } var head = body.clone(offset) body.skip(offset) this.parseKVs(body, function (err, headers) { Iif (err) { return callback(err) } Iif (stream && (!headers[':method'] || !headers[':path'])) { return callback(new Error('Missing `:method` and/or `:path` header')) } var id = head.readUInt32BE() & 0x7fffffff if (id === 0) { return callback(self.error(constants.error.PROTOCOL_ERROR, 'Invalid stream id for HEADERS')) } var associated = stream ? head.readUInt32BE() & 0x7fffffff : 0 var priority = stream ? head.readUInt8() >> 5 : utils.weightToPriority(constants.DEFAULT_WEIGHT) var fin = (flags & constants.flags.FLAG_FIN) !== 0 var unidir = (flags & constants.flags.FLAG_UNIDIRECTIONAL) !== 0 var path = headers[':path'] var isPush = stream && associated !== 0 var weight = utils.priorityToWeight(priority) var priorityInfo = { weight: weight, exclusive: false, parent: 0 } if (!isPush) { callback(null, { type: 'HEADERS', id: id, priority: priorityInfo, fin: fin, writable: !unidir, headers: headers, path: path }) return } Iif (stream && !headers[':status']) { return callback(new Error('Missing `:status` header')) } var filteredHeaders = self._filterHeader(headers, ':status') callback(null, [ { type: 'PUSH_PROMISE', id: associated, fin: false, promisedId: id, headers: filteredHeaders, path: path }, { type: 'HEADERS', id: id, fin: fin, priority: priorityInfo, writable: true, path: undefined, headers: { ':status': headers[':status'] } }]) }) } Parser.prototype.onHeaderFrames = function onHeaderFrames (body, callback) { var offset = this.version === 2 ? 6 : 4 Iif (!body.has(offset)) { return callback(new Error('HEADERS OOB')) } var streamId = body.readUInt32BE() & 0x7fffffff if (this.version === 2) { body.skip(2) } this.parseKVs(body, function (err, headers) { Iif (err) { return callback(err) } callback(null, { type: 'HEADERS', priority: { parent: 0, exclusive: false, weight: constants.DEFAULT_WEIGHT }, id: streamId, fin: false, writable: true, path: undefined, headers: headers }) }) } Parser.prototype.parseKVs = function parseKVs (buffer, callback) { var self = this this.decompress.write(buffer.toChunks(), function (err, chunks) { Iif (err) { return callback(err) } var buffer = new OffsetBuffer() for (var i = 0; i < chunks.length; i++) { buffer.push(chunks[i]) } var size = self.version === 2 ? 2 : 4 Iif (!buffer.has(size)) { return callback(new Error('KV OOB')) } var count = self.version === 2 ? buffer.readUInt16BE() : buffer.readUInt32BE() var headers = {} function readString () { Iif (!buffer.has(size)) { return null } var len = self.version === 2 ? buffer.readUInt16BE() : buffer.readUInt32BE() Iif (!buffer.has(len)) { return null } var value = buffer.take(len) return value.toString() } while (count > 0) { var key = readString() var value = readString() Iif (key === null || value === null) { return callback(new Error('Headers OOB')) } if (self.version < 3) { var isInternal = /^(method|version|url|host|scheme|status)$/.test(key) if (key === 'url') { key = 'path' } if (isInternal) { key = ':' + key } } // Compatibility with HTTP2 if (key === ':status') { value = value.split(/ /g, 2)[0] } count-- if (key === ':host') { key = ':authority' } // Skip version, not present in HTTP2 if (key === ':version') { continue } value = value.split(/\0/g) for (var j = 0; j < value.length; j++) { utils.addHeaderLine(key, value[j], headers) } } callback(null, headers) }) } Parser.prototype.onRSTFrame = function onRSTFrame (body, callback) { Iif (!body.has(8)) { return callback(new Error('RST OOB')) } var frame = { type: 'RST', id: body.readUInt32BE() & 0x7fffffff, code: constants.errorByCode[body.readUInt32BE()] } Iif (frame.id === 0) { return callback(this.error(constants.error.PROTOCOL_ERROR, 'Invalid stream id for RST')) } Iif (body.size !== 0) { frame.extra = body.take(body.size) } callback(null, frame) } Parser.prototype.onSettingsFrame = function onSettingsFrame (body, callback) { Iif (!body.has(4)) { return callback(new Error('SETTINGS OOB')) } var settings = {} var number = body.readUInt32BE() var idMap = { 1: 'upload_bandwidth', 2: 'download_bandwidth', 3: 'round_trip_time', 4: 'max_concurrent_streams', 5: 'current_cwnd', 6: 'download_retrans_rate', 7: 'initial_window_size', 8: 'client_certificate_vector_size' } Iif (!body.has(number * 8)) { return callback(new Error('SETTINGS OOB#2')) } for (var i = 0; i < number; i++) { var id = this.version === 2 ? body.readUInt32LE() : body.readUInt32BE() var flags = (id >> 24) & 0xff id = id & 0xffffff // Skip persisted settings Iif (flags & 0x2) { continue } var name = idMap[id] settings[name] = body.readUInt32BE() } callback(null, { type: 'SETTINGS', settings: settings }) } Parser.prototype.onPingFrame = function onPingFrame (body, callback) { Iif (!body.has(4)) { return callback(new Error('PING OOB')) } var isServer = this.isServer var opaque = body.clone(body.size).take(body.size) var id = body.readUInt32BE() var ack = isServer ? (id % 2 === 0) : (id % 2 === 1) callback(null, { type: 'PING', opaque: opaque, ack: ack }) } Parser.prototype.onGoawayFrame = function onGoawayFrame (body, callback) { Iif (!body.has(8)) { return callback(new Error('GOAWAY OOB')) } callback(null, { type: 'GOAWAY', lastId: body.readUInt32BE() & 0x7fffffff, code: constants.goawayByCode[body.readUInt32BE()] }) } Parser.prototype.onWindowUpdateFrame = function onWindowUpdateFrame (body, callback) { Iif (!body.has(8)) { return callback(new Error('WINDOW_UPDATE OOB')) } callback(null, { type: 'WINDOW_UPDATE', id: body.readUInt32BE() & 0x7fffffff, delta: body.readInt32BE() }) } Parser.prototype.onXForwardedFrame = function onXForwardedFrame (body, callback) { Iif (!body.has(4)) { return callback(new Error('X_FORWARDED OOB')) } var len = body.readUInt32BE() Iif (!body.has(len)) { return callback(new Error('X_FORWARDED host length OOB')) } callback(null, { type: 'X_FORWARDED_FOR', host: body.take(len).toString() }) } |