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// Copyright 2011 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.

// IP-level socket options for Darwin

package net

import (
        "os"
        "syscall"
)

func ipv4MulticastInterface(fd *netFD) (*Interface, error) {
        fd.incref()
        defer fd.decref()
        a, err := syscall.GetsockoptInet4Addr(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF)
        if err != nil {
                return nil, os.NewSyscallError("getsockopt", err)
        }
        return ipv4AddrToInterface(IPv4(a[0], a[1], a[2], a[3]))
}

func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
        ip, err := interfaceToIPv4Addr(ifi)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        var x [4]byte
        copy(x[:], ip.To4())
        fd.incref()
        defer fd.decref()
        err = syscall.SetsockoptInet4Addr(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, x)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func ipv4MulticastLoopback(fd *netFD) (bool, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP)
        if err != nil {
                return false, os.NewSyscallError("getsockopt", err)
        }
        return v == 1, nil
}

func setIPv4MulticastLoopback(fd *netFD, v bool) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func ipv4ReceiveInterface(fd *netFD) (bool, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_RECVIF)
        if err != nil {
                return false, os.NewSyscallError("getsockopt", err)
        }
        return v == 1, nil
}

func setIPv4ReceiveInterface(fd *netFD, v bool) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_RECVIF, boolint(v))
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}