cloudflared-mirror/vendor/github.com/lucas-clemente/quic-go/conn_windows.go

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//go:build windows
// +build windows
package quic
import (
"errors"
"fmt"
"net"
"syscall"
"golang.org/x/sys/windows"
)
const (
disablePathMTUDiscovery = true
IP_DONTFRAGMENT = 14
)
func newConn(c OOBCapablePacketConn) (connection, error) {
rawConn, err := c.SyscallConn()
if err != nil {
return nil, fmt.Errorf("couldn't get syscall.RawConn: %w", err)
}
if err := rawConn.Control(func(fd uintptr) {
// This should succeed if the connection is a IPv4 or a dual-stack connection.
// It will fail for IPv6 connections.
// TODO: properly handle error.
_ = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IP, IP_DONTFRAGMENT, 1)
}); err != nil {
return nil, err
}
return &basicConn{PacketConn: c}, nil
}
func inspectReadBuffer(c net.PacketConn) (int, error) {
conn, ok := c.(interface {
SyscallConn() (syscall.RawConn, error)
})
if !ok {
return 0, errors.New("doesn't have a SyscallConn")
}
rawConn, err := conn.SyscallConn()
if err != nil {
return 0, fmt.Errorf("couldn't get syscall.RawConn: %w", err)
}
var size int
var serr error
if err := rawConn.Control(func(fd uintptr) {
size, serr = windows.GetsockoptInt(windows.Handle(fd), windows.SOL_SOCKET, windows.SO_RCVBUF)
}); err != nil {
return 0, err
}
return size, serr
}
func (i *packetInfo) OOB() []byte { return nil }