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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.

// +build darwin freebsd linux netbsd openbsd windows

// IP-level socket options

package net

import (
        "os"
        "syscall"
)

func ipv4TOS(fd *netFD) (int, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_TOS)
        if err != nil {
                return -1, os.NewSyscallError("getsockopt", err)
        }
        return v, nil
}

func setIPv4TOS(fd *netFD, v int) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_TOS, v)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func ipv4TTL(fd *netFD) (int, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_TTL)
        if err != nil {
                return -1, os.NewSyscallError("getsockopt", err)
        }
        return v, nil
}

func setIPv4TTL(fd *netFD, v int) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_TTL, v)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
        mreq := &syscall.IPMreq{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}}
        if err := setIPv4MreqToInterface(mreq, ifi); err != nil {
                return err
        }
        fd.incref()
        defer fd.decref()
        return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreq(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq))
}

func leaveIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
        mreq := &syscall.IPMreq{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}}
        if err := setIPv4MreqToInterface(mreq, ifi); err != nil {
                return err
        }
        fd.incref()
        defer fd.decref()
        return os.NewSyscallError("setsockopt", syscall.SetsockoptIPMreq(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_DROP_MEMBERSHIP, mreq))
}

func ipv6HopLimit(fd *netFD) (int, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_UNICAST_HOPS)
        if err != nil {
                return -1, os.NewSyscallError("getsockopt", err)
        }
        return v, nil
}

func setIPv6HopLimit(fd *netFD, v int) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_UNICAST_HOPS, v)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func ipv6MulticastInterface(fd *netFD) (*Interface, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF)
        if err != nil {
                return nil, os.NewSyscallError("getsockopt", err)
        }
        if v == 0 {
                return nil, nil
        }
        ifi, err := InterfaceByIndex(v)
        if err != nil {
                return nil, err
        }
        return ifi, nil
}

func setIPv6MulticastInterface(fd *netFD, ifi *Interface) error {
        var v int
        if ifi != nil {
                v = ifi.Index
        }
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_IF, v)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func ipv6MulticastHopLimit(fd *netFD) (int, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_HOPS)
        if err != nil {
                return -1, os.NewSyscallError("getsockopt", err)
        }
        return v, nil
}

func setIPv6MulticastHopLimit(fd *netFD, v int) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_HOPS, v)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func ipv6MulticastLoopback(fd *netFD) (bool, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP)
        if err != nil {
                return false, os.NewSyscallError("getsockopt", err)
        }
        return v == 1, nil
}

func setIPv6MulticastLoopback(fd *netFD, v bool) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_MULTICAST_LOOP, boolint(v))
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func joinIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
        mreq := &syscall.IPv6Mreq{}
        copy(mreq.Multiaddr[:], ip)
        if ifi != nil {
                mreq.Interface = uint32(ifi.Index)
        }
        fd.incref()
        defer fd.decref()
        return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_JOIN_GROUP, mreq))
}

func leaveIPv6Group(fd *netFD, ifi *Interface, ip IP) error {
        mreq := &syscall.IPv6Mreq{}
        copy(mreq.Multiaddr[:], ip)
        if ifi != nil {
                mreq.Interface = uint32(ifi.Index)
        }
        fd.incref()
        defer fd.decref()
        return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_LEAVE_GROUP, mreq))
}