77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
package quic
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import (
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"net"
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"syscall"
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"time"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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"github.com/lucas-clemente/quic-go/internal/utils"
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)
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// OOBCapablePacketConn is a connection that allows the reading of ECN bits from the IP header.
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// If the PacketConn passed to Dial or Listen satisfies this interface, quic-go will use it.
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// In this case, ReadMsgUDP() will be used instead of ReadFrom() to read packets.
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type OOBCapablePacketConn interface {
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net.PacketConn
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SyscallConn() (syscall.RawConn, error)
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ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *net.UDPAddr, err error)
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WriteMsgUDP(b, oob []byte, addr *net.UDPAddr) (n, oobn int, err error)
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}
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var _ OOBCapablePacketConn = &net.UDPConn{}
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func wrapConn(pc net.PacketConn) (rawConn, error) {
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conn, ok := pc.(interface {
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SyscallConn() (syscall.RawConn, error)
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})
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if ok {
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rawConn, err := conn.SyscallConn()
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if err != nil {
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return nil, err
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}
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err = setDF(rawConn)
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if err != nil {
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return nil, err
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}
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}
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c, ok := pc.(OOBCapablePacketConn)
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if !ok {
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utils.DefaultLogger.Infof("PacketConn is not a net.UDPConn. Disabling optimizations possible on UDP connections.")
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return &basicConn{PacketConn: pc}, nil
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}
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return newConn(c)
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}
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// The basicConn is the most trivial implementation of a connection.
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// It reads a single packet from the underlying net.PacketConn.
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// It is used when
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// * the net.PacketConn is not a OOBCapablePacketConn, and
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// * when the OS doesn't support OOB.
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type basicConn struct {
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net.PacketConn
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}
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var _ rawConn = &basicConn{}
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func (c *basicConn) ReadPacket() (*receivedPacket, error) {
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buffer := getPacketBuffer()
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// The packet size should not exceed protocol.MaxPacketBufferSize bytes
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// If it does, we only read a truncated packet, which will then end up undecryptable
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buffer.Data = buffer.Data[:protocol.MaxPacketBufferSize]
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n, addr, err := c.PacketConn.ReadFrom(buffer.Data)
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if err != nil {
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return nil, err
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}
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return &receivedPacket{
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remoteAddr: addr,
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rcvTime: time.Now(),
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data: buffer.Data[:n],
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buffer: buffer,
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}, nil
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}
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func (c *basicConn) WritePacket(b []byte, addr net.Addr, _ []byte) (n int, err error) {
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return c.PacketConn.WriteTo(b, addr)
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}
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