github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/net/ipv4/sockopt_asmreq_windows.go (about)

     1  // Copyright 2012 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package ipv4
     6  
     7  import (
     8  	"net"
     9  	"os"
    10  	"syscall"
    11  	"unsafe"
    12  
    13  	"golang.org/x/net/internal/iana"
    14  )
    15  
    16  func setsockoptIPMreq(fd syscall.Handle, name int, ifi *net.Interface, grp net.IP) error {
    17  	mreq := sysIPMreq{Multiaddr: [4]byte{grp[0], grp[1], grp[2], grp[3]}}
    18  	if err := setIPMreqInterface(&mreq, ifi); err != nil {
    19  		return err
    20  	}
    21  	return os.NewSyscallError("setsockopt", syscall.Setsockopt(fd, iana.ProtocolIP, int32(name), (*byte)(unsafe.Pointer(&mreq)), int32(sysSizeofIPMreq)))
    22  }
    23  
    24  func getsockoptInterface(fd syscall.Handle, name int) (*net.Interface, error) {
    25  	var b [4]byte
    26  	l := int32(4)
    27  	if err := syscall.Getsockopt(fd, iana.ProtocolIP, int32(name), (*byte)(unsafe.Pointer(&b[0])), &l); err != nil {
    28  		return nil, os.NewSyscallError("getsockopt", err)
    29  	}
    30  	ifi, err := netIP4ToInterface(net.IPv4(b[0], b[1], b[2], b[3]))
    31  	if err != nil {
    32  		return nil, err
    33  	}
    34  	return ifi, nil
    35  }
    36  
    37  func setsockoptInterface(fd syscall.Handle, name int, ifi *net.Interface) error {
    38  	ip, err := netInterfaceToIP4(ifi)
    39  	if err != nil {
    40  		return err
    41  	}
    42  	var b [4]byte
    43  	copy(b[:], ip)
    44  	return os.NewSyscallError("setsockopt", syscall.Setsockopt(fd, iana.ProtocolIP, int32(name), (*byte)(unsafe.Pointer(&b[0])), 4))
    45  }