46 lines
1.3 KiB
Go
46 lines
1.3 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build darwin dragonfly freebsd netbsd openbsd
|
|
|
|
package ipv4
|
|
|
|
import (
|
|
"net"
|
|
"os"
|
|
"unsafe"
|
|
|
|
"golang.org/x/net/internal/iana"
|
|
)
|
|
|
|
func setsockoptIPMreq(fd, name int, ifi *net.Interface, grp net.IP) error {
|
|
mreq := sysIPMreq{Multiaddr: [4]byte{grp[0], grp[1], grp[2], grp[3]}}
|
|
if err := setIPMreqInterface(&mreq, ifi); err != nil {
|
|
return err
|
|
}
|
|
return os.NewSyscallError("setsockopt", setsockopt(fd, iana.ProtocolIP, name, unsafe.Pointer(&mreq), sysSizeofIPMreq))
|
|
}
|
|
|
|
func getsockoptInterface(fd, name int) (*net.Interface, error) {
|
|
var b [4]byte
|
|
l := uint32(4)
|
|
if err := getsockopt(fd, iana.ProtocolIP, name, unsafe.Pointer(&b[0]), &l); err != nil {
|
|
return nil, os.NewSyscallError("getsockopt", err)
|
|
}
|
|
ifi, err := netIP4ToInterface(net.IPv4(b[0], b[1], b[2], b[3]))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return ifi, nil
|
|
}
|
|
|
|
func setsockoptInterface(fd, name int, ifi *net.Interface) error {
|
|
ip, err := netInterfaceToIP4(ifi)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var b [4]byte
|
|
copy(b[:], ip)
|
|
return os.NewSyscallError("setsockopt", setsockopt(fd, iana.ProtocolIP, name, unsafe.Pointer(&b[0]), uint32(4)))
|
|
}
|