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46 lines
1.3 KiB
46 lines
1.3 KiB
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ipv4
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import (
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"net"
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"os"
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"syscall"
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"unsafe"
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"golang.org/x/net/internal/iana"
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)
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func setsockoptIPMreq(fd syscall.Handle, name int, ifi *net.Interface, grp net.IP) error {
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mreq := sysIPMreq{Multiaddr: [4]byte{grp[0], grp[1], grp[2], grp[3]}}
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if err := setIPMreqInterface(&mreq, ifi); err != nil {
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return err
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}
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return os.NewSyscallError("setsockopt", syscall.Setsockopt(fd, iana.ProtocolIP, int32(name), (*byte)(unsafe.Pointer(&mreq)), int32(sysSizeofIPMreq)))
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}
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func getsockoptInterface(fd syscall.Handle, name int) (*net.Interface, error) {
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var b [4]byte
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l := int32(4)
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if err := syscall.Getsockopt(fd, iana.ProtocolIP, int32(name), (*byte)(unsafe.Pointer(&b[0])), &l); err != nil {
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return nil, os.NewSyscallError("getsockopt", err)
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}
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ifi, err := netIP4ToInterface(net.IPv4(b[0], b[1], b[2], b[3]))
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if err != nil {
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return nil, err
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}
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return ifi, nil
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}
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func setsockoptInterface(fd syscall.Handle, name int, ifi *net.Interface) error {
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ip, err := netInterfaceToIP4(ifi)
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if err != nil {
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return err
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}
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var b [4]byte
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copy(b[:], ip)
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return os.NewSyscallError("setsockopt", syscall.Setsockopt(fd, iana.ProtocolIP, int32(name), (*byte)(unsafe.Pointer(&b[0])), 4))
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}
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