435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
123 lines
2.5 KiB
Go
123 lines
2.5 KiB
Go
// 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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// +build aix darwin dragonfly freebsd netbsd openbsd solaris windows
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package ipv4
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import (
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"errors"
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"net"
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"unsafe"
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"golang.org/x/net/internal/socket"
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)
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var errNoSuchInterface = errors.New("no such interface")
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func (so *sockOpt) setIPMreq(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
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mreq := ipMreq{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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b := (*[sizeofIPMreq]byte)(unsafe.Pointer(&mreq))[:sizeofIPMreq]
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return so.Set(c, b)
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}
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func (so *sockOpt) getMulticastIf(c *socket.Conn) (*net.Interface, error) {
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var b [4]byte
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if _, err := so.Get(c, b[:]); err != nil {
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return nil, 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 (so *sockOpt) setMulticastIf(c *socket.Conn, 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 so.Set(c, b[:])
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}
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func setIPMreqInterface(mreq *ipMreq, ifi *net.Interface) error {
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if ifi == nil {
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return nil
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}
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ifat, err := ifi.Addrs()
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if err != nil {
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return err
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}
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for _, ifa := range ifat {
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switch ifa := ifa.(type) {
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case *net.IPAddr:
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if ip := ifa.IP.To4(); ip != nil {
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copy(mreq.Interface[:], ip)
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return nil
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}
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case *net.IPNet:
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if ip := ifa.IP.To4(); ip != nil {
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copy(mreq.Interface[:], ip)
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return nil
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}
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}
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}
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return errNoSuchInterface
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}
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func netIP4ToInterface(ip net.IP) (*net.Interface, error) {
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ift, err := net.Interfaces()
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if err != nil {
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return nil, err
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}
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for _, ifi := range ift {
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ifat, err := ifi.Addrs()
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if err != nil {
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return nil, err
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}
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for _, ifa := range ifat {
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switch ifa := ifa.(type) {
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case *net.IPAddr:
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if ip.Equal(ifa.IP) {
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return &ifi, nil
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}
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case *net.IPNet:
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if ip.Equal(ifa.IP) {
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return &ifi, nil
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}
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}
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}
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}
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return nil, errNoSuchInterface
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}
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func netInterfaceToIP4(ifi *net.Interface) (net.IP, error) {
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if ifi == nil {
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return net.IPv4zero.To4(), nil
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}
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ifat, err := ifi.Addrs()
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if err != nil {
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return nil, err
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}
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for _, ifa := range ifat {
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switch ifa := ifa.(type) {
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case *net.IPAddr:
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if ip := ifa.IP.To4(); ip != nil {
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return ip, nil
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}
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case *net.IPNet:
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if ip := ifa.IP.To4(); ip != nil {
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return ip, nil
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}
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}
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}
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return nil, errNoSuchInterface
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}
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