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144 lines
2.5 KiB
144 lines
2.5 KiB
package dns
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import (
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"encoding/binary"
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"sync"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/serial"
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"golang.org/x/net/dns/dnsmessage"
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)
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func PackMessage(msg *dnsmessage.Message) (*buf.Buffer, error) {
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buffer := buf.New()
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rawBytes := buffer.Extend(buf.Size)
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packed, err := msg.AppendPack(rawBytes[:0])
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if err != nil {
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buffer.Release()
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return nil, err
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}
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buffer.Resize(0, int32(len(packed)))
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return buffer, nil
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}
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type MessageReader interface {
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ReadMessage() (*buf.Buffer, error)
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}
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type UDPReader struct {
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buf.Reader
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access sync.Mutex
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cache buf.MultiBuffer
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}
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func (r *UDPReader) readCache() *buf.Buffer {
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r.access.Lock()
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defer r.access.Unlock()
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mb, b := buf.SplitFirst(r.cache)
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r.cache = mb
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return b
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}
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func (r *UDPReader) refill() error {
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mb, err := r.Reader.ReadMultiBuffer()
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if err != nil {
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return err
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}
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r.access.Lock()
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r.cache = mb
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r.access.Unlock()
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return nil
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}
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// ReadMessage implements MessageReader.
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func (r *UDPReader) ReadMessage() (*buf.Buffer, error) {
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for {
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b := r.readCache()
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if b != nil {
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return b, nil
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}
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if err := r.refill(); err != nil {
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return nil, err
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}
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}
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}
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// Close implements common.Closable.
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func (r *UDPReader) Close() error {
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defer func() {
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r.access.Lock()
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buf.ReleaseMulti(r.cache)
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r.cache = nil
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r.access.Unlock()
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}()
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return common.Close(r.Reader)
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}
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type TCPReader struct {
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reader *buf.BufferedReader
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}
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func NewTCPReader(reader buf.Reader) *TCPReader {
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return &TCPReader{
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reader: &buf.BufferedReader{
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Reader: reader,
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},
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}
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}
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func (r *TCPReader) ReadMessage() (*buf.Buffer, error) {
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size, err := serial.ReadUint16(r.reader)
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if err != nil {
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return nil, err
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}
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if size > buf.Size {
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return nil, newError("message size too large: ", size)
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}
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b := buf.New()
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if _, err := b.ReadFullFrom(r.reader, int32(size)); err != nil {
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return nil, err
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}
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return b, nil
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}
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func (r *TCPReader) Interrupt() {
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common.Interrupt(r.reader)
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}
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func (r *TCPReader) Close() error {
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return common.Close(r.reader)
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}
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type MessageWriter interface {
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WriteMessage(msg *buf.Buffer) error
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}
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type UDPWriter struct {
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buf.Writer
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}
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func (w *UDPWriter) WriteMessage(b *buf.Buffer) error {
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return w.WriteMultiBuffer(buf.MultiBuffer{b})
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}
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type TCPWriter struct {
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buf.Writer
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}
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func (w *TCPWriter) WriteMessage(b *buf.Buffer) error {
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if b.IsEmpty() {
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return nil
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}
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mb := make(buf.MultiBuffer, 0, 2)
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size := buf.New()
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binary.BigEndian.PutUint16(size.Extend(2), uint16(b.Len()))
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mb = append(mb, size, b)
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return w.WriteMultiBuffer(mb)
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}
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