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// 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 solaris windows
package ipv4
import (
"net"
"os"
"unsafe"
"golang.org/x/net/internal/iana"
)
func setsockoptIPMreq(s uintptr, name int, ifi *net.Interface, grp net.IP) error {
mreq := ipMreq{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(s, iana.ProtocolIP, name, unsafe.Pointer(&mreq), sizeofIPMreq))
}
func getsockoptInterface(s uintptr, name int) (*net.Interface, error) {
var b [4]byte
l := uint32(4)
if err := getsockopt(s, 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(s uintptr, 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(s, iana.ProtocolIP, name, unsafe.Pointer(&b[0]), uint32(4)))
}
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