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//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd
// +build aix darwin dragonfly freebsd linux netbsd openbsd
package dns
import (
"context"
"net"
"syscall"
"golang.org/x/sys/unix"
)
const supportsReusePort = true
func reuseportControl(network, address string, c syscall.RawConn) error {
var opErr error
err := c.Control(func(fd uintptr) {
opErr = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
})
if err != nil {
return err
}
return opErr
}
const supportsReuseAddr = true
func reuseaddrControl(network, address string, c syscall.RawConn) error {
var opErr error
err := c.Control(func(fd uintptr) {
opErr = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
})
if err != nil {
return err
}
return opErr
}
func reuseaddrandportControl(network, address string, c syscall.RawConn) error {
err := reuseaddrControl(network, address, c)
if err != nil {
return err
}
return reuseportControl(network, address, c)
}
// this is just for test compatibility
func checkReuseport(fd uintptr) (bool, error) {
v, err := unix.GetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT)
if err != nil {
return false, err
}
return v == 1, nil
}
// this is just for test compatibility
func checkReuseaddr(fd uintptr) (bool, error) {
v, err := unix.GetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR)
if err != nil {
return false, err
}
return v == 1, nil
}
func listenTCP(network, addr string, reuseport, reuseaddr bool) (net.Listener, error) {
var lc net.ListenConfig
switch {
case reuseaddr && reuseport:
lc.Control = reuseaddrandportControl
case reuseport:
lc.Control = reuseportControl
case reuseaddr:
lc.Control = reuseaddrControl
}
return lc.Listen(context.Background(), network, addr)
}
func listenUDP(network, addr string, reuseport, reuseaddr bool) (net.PacketConn, error) {
var lc net.ListenConfig
switch {
case reuseaddr && reuseport:
lc.Control = reuseaddrandportControl
case reuseport:
lc.Control = reuseportControl
case reuseaddr:
lc.Control = reuseaddrControl
}
return lc.ListenPacket(context.Background(), network, addr)
}
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