349 lines
9.6 KiB
Go
349 lines
9.6 KiB
Go
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package spdy
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import (
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"compress/zlib"
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"encoding/binary"
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"io"
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"net/http"
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"strings"
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)
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func (frame *SynStreamFrame) read(h ControlFrameHeader, f *Framer) error {
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return f.readSynStreamFrame(h, frame)
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}
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func (frame *SynReplyFrame) read(h ControlFrameHeader, f *Framer) error {
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return f.readSynReplyFrame(h, frame)
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}
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func (frame *RstStreamFrame) read(h ControlFrameHeader, f *Framer) error {
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frame.CFHeader = h
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if err := binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
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return err
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}
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if err := binary.Read(f.r, binary.BigEndian, &frame.Status); err != nil {
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return err
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}
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if frame.Status == 0 {
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return &Error{InvalidControlFrame, frame.StreamId}
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}
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if frame.StreamId == 0 {
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return &Error{ZeroStreamId, 0}
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}
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return nil
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}
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func (frame *SettingsFrame) read(h ControlFrameHeader, f *Framer) error {
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frame.CFHeader = h
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var numSettings uint32
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if err := binary.Read(f.r, binary.BigEndian, &numSettings); err != nil {
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return err
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}
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frame.FlagIdValues = make([]SettingsFlagIdValue, numSettings)
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for i := uint32(0); i < numSettings; i++ {
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if err := binary.Read(f.r, binary.BigEndian, &frame.FlagIdValues[i].Id); err != nil {
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return err
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}
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frame.FlagIdValues[i].Flag = SettingsFlag((frame.FlagIdValues[i].Id & 0xff000000) >> 24)
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frame.FlagIdValues[i].Id &= 0xffffff
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if err := binary.Read(f.r, binary.BigEndian, &frame.FlagIdValues[i].Value); err != nil {
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return err
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}
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}
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return nil
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}
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func (frame *PingFrame) read(h ControlFrameHeader, f *Framer) error {
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frame.CFHeader = h
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if err := binary.Read(f.r, binary.BigEndian, &frame.Id); err != nil {
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return err
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}
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if frame.Id == 0 {
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return &Error{ZeroStreamId, 0}
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}
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if frame.CFHeader.Flags != 0 {
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return &Error{InvalidControlFrame, StreamId(frame.Id)}
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}
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return nil
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}
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func (frame *GoAwayFrame) read(h ControlFrameHeader, f *Framer) error {
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frame.CFHeader = h
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if err := binary.Read(f.r, binary.BigEndian, &frame.LastGoodStreamId); err != nil {
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return err
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}
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if frame.CFHeader.Flags != 0 {
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return &Error{InvalidControlFrame, frame.LastGoodStreamId}
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}
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if frame.CFHeader.length != 8 {
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return &Error{InvalidControlFrame, frame.LastGoodStreamId}
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}
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if err := binary.Read(f.r, binary.BigEndian, &frame.Status); err != nil {
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return err
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}
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return nil
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}
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func (frame *HeadersFrame) read(h ControlFrameHeader, f *Framer) error {
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return f.readHeadersFrame(h, frame)
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}
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func (frame *WindowUpdateFrame) read(h ControlFrameHeader, f *Framer) error {
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frame.CFHeader = h
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if err := binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
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return err
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}
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if frame.CFHeader.Flags != 0 {
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return &Error{InvalidControlFrame, frame.StreamId}
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}
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if frame.CFHeader.length != 8 {
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return &Error{InvalidControlFrame, frame.StreamId}
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}
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if err := binary.Read(f.r, binary.BigEndian, &frame.DeltaWindowSize); err != nil {
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return err
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}
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return nil
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}
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func newControlFrame(frameType ControlFrameType) (controlFrame, error) {
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ctor, ok := cframeCtor[frameType]
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if !ok {
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return nil, &Error{Err: InvalidControlFrame}
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}
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return ctor(), nil
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}
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var cframeCtor = map[ControlFrameType]func() controlFrame{
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TypeSynStream: func() controlFrame { return new(SynStreamFrame) },
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TypeSynReply: func() controlFrame { return new(SynReplyFrame) },
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TypeRstStream: func() controlFrame { return new(RstStreamFrame) },
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TypeSettings: func() controlFrame { return new(SettingsFrame) },
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TypePing: func() controlFrame { return new(PingFrame) },
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TypeGoAway: func() controlFrame { return new(GoAwayFrame) },
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TypeHeaders: func() controlFrame { return new(HeadersFrame) },
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TypeWindowUpdate: func() controlFrame { return new(WindowUpdateFrame) },
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}
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func (f *Framer) uncorkHeaderDecompressor(payloadSize int64) error {
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if f.headerDecompressor != nil {
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f.headerReader.N = payloadSize
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return nil
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}
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f.headerReader = io.LimitedReader{R: f.r, N: payloadSize}
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decompressor, err := zlib.NewReaderDict(&f.headerReader, []byte(headerDictionary))
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if err != nil {
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return err
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}
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f.headerDecompressor = decompressor
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return nil
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}
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// ReadFrame reads SPDY encoded data and returns a decompressed Frame.
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func (f *Framer) ReadFrame() (Frame, error) {
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var firstWord uint32
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if err := binary.Read(f.r, binary.BigEndian, &firstWord); err != nil {
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return nil, err
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}
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if firstWord&0x80000000 != 0 {
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frameType := ControlFrameType(firstWord & 0xffff)
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version := uint16(firstWord >> 16 & 0x7fff)
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return f.parseControlFrame(version, frameType)
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}
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return f.parseDataFrame(StreamId(firstWord & 0x7fffffff))
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}
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func (f *Framer) parseControlFrame(version uint16, frameType ControlFrameType) (Frame, error) {
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var length uint32
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if err := binary.Read(f.r, binary.BigEndian, &length); err != nil {
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return nil, err
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}
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flags := ControlFlags((length & 0xff000000) >> 24)
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length &= 0xffffff
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header := ControlFrameHeader{version, frameType, flags, length}
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cframe, err := newControlFrame(frameType)
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if err != nil {
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return nil, err
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}
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if err = cframe.read(header, f); err != nil {
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return nil, err
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}
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return cframe, nil
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}
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func parseHeaderValueBlock(r io.Reader, streamId StreamId) (http.Header, error) {
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var numHeaders uint32
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if err := binary.Read(r, binary.BigEndian, &numHeaders); err != nil {
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return nil, err
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}
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var e error
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h := make(http.Header, int(numHeaders))
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for i := 0; i < int(numHeaders); i++ {
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var length uint32
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if err := binary.Read(r, binary.BigEndian, &length); err != nil {
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return nil, err
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}
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nameBytes := make([]byte, length)
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if _, err := io.ReadFull(r, nameBytes); err != nil {
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return nil, err
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}
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name := string(nameBytes)
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if name != strings.ToLower(name) {
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e = &Error{UnlowercasedHeaderName, streamId}
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name = strings.ToLower(name)
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}
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if h[name] != nil {
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e = &Error{DuplicateHeaders, streamId}
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}
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if err := binary.Read(r, binary.BigEndian, &length); err != nil {
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return nil, err
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}
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value := make([]byte, length)
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if _, err := io.ReadFull(r, value); err != nil {
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return nil, err
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}
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valueList := strings.Split(string(value), headerValueSeparator)
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for _, v := range valueList {
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h.Add(name, v)
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}
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}
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if e != nil {
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return h, e
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}
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return h, nil
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}
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func (f *Framer) readSynStreamFrame(h ControlFrameHeader, frame *SynStreamFrame) error {
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frame.CFHeader = h
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var err error
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if err = binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
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return err
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}
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if err = binary.Read(f.r, binary.BigEndian, &frame.AssociatedToStreamId); err != nil {
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return err
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}
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if err = binary.Read(f.r, binary.BigEndian, &frame.Priority); err != nil {
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return err
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}
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frame.Priority >>= 5
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if err = binary.Read(f.r, binary.BigEndian, &frame.Slot); err != nil {
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return err
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}
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reader := f.r
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if !f.headerCompressionDisabled {
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err := f.uncorkHeaderDecompressor(int64(h.length - 10))
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if err != nil {
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return err
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}
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reader = f.headerDecompressor
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}
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frame.Headers, err = parseHeaderValueBlock(reader, frame.StreamId)
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if !f.headerCompressionDisabled && (err == io.EOF && f.headerReader.N == 0 || f.headerReader.N != 0) {
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err = &Error{WrongCompressedPayloadSize, 0}
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}
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if err != nil {
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return err
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}
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for h := range frame.Headers {
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if invalidReqHeaders[h] {
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return &Error{InvalidHeaderPresent, frame.StreamId}
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}
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}
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if frame.StreamId == 0 {
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return &Error{ZeroStreamId, 0}
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}
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return nil
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}
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func (f *Framer) readSynReplyFrame(h ControlFrameHeader, frame *SynReplyFrame) error {
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frame.CFHeader = h
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var err error
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if err = binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
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return err
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}
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reader := f.r
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if !f.headerCompressionDisabled {
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err := f.uncorkHeaderDecompressor(int64(h.length - 4))
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if err != nil {
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return err
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}
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reader = f.headerDecompressor
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}
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frame.Headers, err = parseHeaderValueBlock(reader, frame.StreamId)
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if !f.headerCompressionDisabled && (err == io.EOF && f.headerReader.N == 0 || f.headerReader.N != 0) {
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err = &Error{WrongCompressedPayloadSize, 0}
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}
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if err != nil {
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return err
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}
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for h := range frame.Headers {
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if invalidRespHeaders[h] {
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return &Error{InvalidHeaderPresent, frame.StreamId}
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}
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}
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if frame.StreamId == 0 {
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return &Error{ZeroStreamId, 0}
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}
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return nil
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}
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func (f *Framer) readHeadersFrame(h ControlFrameHeader, frame *HeadersFrame) error {
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frame.CFHeader = h
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var err error
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if err = binary.Read(f.r, binary.BigEndian, &frame.StreamId); err != nil {
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return err
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}
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reader := f.r
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if !f.headerCompressionDisabled {
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err := f.uncorkHeaderDecompressor(int64(h.length - 4))
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if err != nil {
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return err
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}
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reader = f.headerDecompressor
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}
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frame.Headers, err = parseHeaderValueBlock(reader, frame.StreamId)
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if !f.headerCompressionDisabled && (err == io.EOF && f.headerReader.N == 0 || f.headerReader.N != 0) {
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err = &Error{WrongCompressedPayloadSize, 0}
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}
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if err != nil {
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return err
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}
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var invalidHeaders map[string]bool
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if frame.StreamId%2 == 0 {
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invalidHeaders = invalidReqHeaders
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} else {
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invalidHeaders = invalidRespHeaders
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}
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for h := range frame.Headers {
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if invalidHeaders[h] {
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return &Error{InvalidHeaderPresent, frame.StreamId}
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}
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}
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if frame.StreamId == 0 {
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return &Error{ZeroStreamId, 0}
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}
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return nil
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}
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func (f *Framer) parseDataFrame(streamId StreamId) (*DataFrame, error) {
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var length uint32
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if err := binary.Read(f.r, binary.BigEndian, &length); err != nil {
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return nil, err
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}
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var frame DataFrame
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frame.StreamId = streamId
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frame.Flags = DataFlags(length >> 24)
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length &= 0xffffff
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frame.Data = make([]byte, length)
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if _, err := io.ReadFull(f.r, frame.Data); err != nil {
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return nil, err
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}
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if frame.StreamId == 0 {
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return nil, &Error{ZeroStreamId, 0}
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}
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return &frame, nil
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}
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