AdGuardHome/internal/aghnet/interfaces_unix.go

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//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd || solaris
// +build aix darwin dragonfly freebsd netbsd openbsd solaris
package aghnet
import (
"context"
"fmt"
"net"
"os"
"syscall"
"github.com/AdguardTeam/golibs/errors"
"golang.org/x/sys/unix"
)
// reuseAddrCtrl is the function to be set to net.ListenConfig.Control. It
// configures the socket to have a reusable port binding.
func reuseAddrCtrl(_, _ string, c syscall.RawConn) (err error) {
cerr := c.Control(func(fd uintptr) {
// TODO(e.burkov): Consider using SO_REUSEPORT.
err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
if err != nil {
err = os.NewSyscallError("setsockopt", err)
}
})
const (
errMsg = "setting control options"
errMsgFmt = errMsg + ": %w"
)
if err != nil && cerr != nil {
err = errors.List(errMsg, err, cerr)
} else if err != nil {
err = fmt.Errorf(errMsgFmt, err)
} else if cerr != nil {
err = fmt.Errorf(errMsgFmt, cerr)
}
return err
}
// listenPacketReusable announces on the local network address additionally
// configuring the socket to have a reusable binding.
func listenPacketReusable(_, network, address string) (c net.PacketConn, err error) {
var lc net.ListenConfig
lc.Control = reuseAddrCtrl
return lc.ListenPacket(context.Background(), network, address)
}