mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-09 18:43:14 +00:00
Improve DNS truncate behavior
This commit is contained in:
parent
5327aeaea4
commit
917514e09f
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@ -46,8 +46,8 @@ func (d *DNS) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.Pa
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}
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func (d *DNS) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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metadata.Destination = M.Socksaddr{}
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defer conn.Close()
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ctx = adapter.WithContext(ctx, &metadata)
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for {
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err := d.handleConnection(ctx, conn, metadata)
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if err != nil {
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@ -98,6 +98,7 @@ func (d *DNS) handleConnection(ctx context.Context, conn net.Conn, metadata adap
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}
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func (d *DNS) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
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metadata.Destination = M.Socksaddr{}
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var reader N.PacketReader = conn
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var counters []N.CountFunc
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var cachedPackets []*N.PacketBuffer
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@ -111,14 +112,11 @@ func (d *DNS) NewPacketConnection(ctx context.Context, conn N.PacketConn, metada
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}
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}
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if readWaiter, created := bufio.CreatePacketReadWaiter(reader); created {
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readWaiter.InitializeReadWaiter(N.ReadWaitOptions{
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MTU: dns.FixedPacketSize,
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})
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readWaiter.InitializeReadWaiter(N.ReadWaitOptions{})
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return d.newPacketConnection(ctx, conn, readWaiter, counters, cachedPackets, metadata)
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}
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break
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}
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ctx = adapter.WithContext(ctx, &metadata)
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fastClose, cancel := common.ContextWithCancelCause(ctx)
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timeout := canceler.New(fastClose, cancel, C.DNSTimeout)
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var group task.Group
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@ -167,15 +165,11 @@ func (d *DNS) NewPacketConnection(ctx context.Context, conn N.PacketConn, metada
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return err
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}
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timeout.Update()
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responseBuffer := buf.NewPacket()
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responseBuffer.Resize(1024, 0)
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n, err := response.PackBuffer(responseBuffer.FreeBytes())
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responseBuffer, err := dns.TruncateDNSMessage(&message, response, 1024)
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if err != nil {
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cancel(err)
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responseBuffer.Release()
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return err
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}
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responseBuffer.Truncate(len(n))
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err = conn.WritePacket(responseBuffer, destination)
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if err != nil {
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cancel(err)
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@ -241,16 +235,11 @@ func (d *DNS) newPacketConnection(ctx context.Context, conn N.PacketConn, readWa
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return err
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}
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timeout.Update()
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response = truncateDNSMessage(response, 512) // TODO: add an option to custom UDP buffer size
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responseBuffer := buf.NewSize(dns.FixedPacketSize)
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responseBuffer.Resize(1024, 0)
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n, err := response.PackBuffer(responseBuffer.FreeBytes())
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responseBuffer, err := dns.TruncateDNSMessage(&message, response, 1024)
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if err != nil {
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cancel(err)
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responseBuffer.Release()
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return err
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}
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responseBuffer.Truncate(len(n))
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err = conn.WritePacket(responseBuffer, destination)
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if err != nil {
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cancel(err)
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@ -264,22 +253,3 @@ func (d *DNS) newPacketConnection(ctx context.Context, conn N.PacketConn, readWa
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})
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return group.Run(fastClose)
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}
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func truncateDNSMessage(response *mDNS.Msg, maxLen int) *mDNS.Msg {
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responseLen := response.Len()
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if responseLen <= maxLen {
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return response
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}
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newResponse := *response
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response = &newResponse
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for len(response.Answer) > 0 && responseLen > maxLen {
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response.Answer = response.Answer[:len(response.Answer)-1]
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response.Truncated = true
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responseLen = response.Len()
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}
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if responseLen > maxLen {
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response.Ns = nil
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response.Extra = nil
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}
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return response
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}
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