75 lines
1.6 KiB
Go
75 lines
1.6 KiB
Go
// Copyright 2014 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 darwin dragonfly freebsd linux netbsd openbsd solaris windows
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package icmp
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import (
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"net"
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"strconv"
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"syscall"
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)
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func sockaddr(family int, address string) (syscall.Sockaddr, error) {
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switch family {
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case syscall.AF_INET:
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a, err := net.ResolveIPAddr("ip4", address)
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if err != nil {
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return nil, err
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}
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if len(a.IP) == 0 {
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a.IP = net.IPv4zero
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}
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if a.IP = a.IP.To4(); a.IP == nil {
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return nil, net.InvalidAddrError("non-ipv4 address")
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}
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sa := &syscall.SockaddrInet4{}
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copy(sa.Addr[:], a.IP)
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return sa, nil
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case syscall.AF_INET6:
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a, err := net.ResolveIPAddr("ip6", address)
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if err != nil {
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return nil, err
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}
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if len(a.IP) == 0 {
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a.IP = net.IPv6unspecified
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}
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if a.IP.Equal(net.IPv4zero) {
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a.IP = net.IPv6unspecified
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}
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if a.IP = a.IP.To16(); a.IP == nil || a.IP.To4() != nil {
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return nil, net.InvalidAddrError("non-ipv6 address")
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}
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sa := &syscall.SockaddrInet6{ZoneId: zoneToUint32(a.Zone)}
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copy(sa.Addr[:], a.IP)
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return sa, nil
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default:
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return nil, net.InvalidAddrError("unexpected family")
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}
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}
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func zoneToUint32(zone string) uint32 {
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if zone == "" {
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return 0
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}
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if ifi, err := net.InterfaceByName(zone); err == nil {
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return uint32(ifi.Index)
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}
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n, err := strconv.Atoi(zone)
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if err != nil {
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return 0
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}
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return uint32(n)
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}
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func last(s string, b byte) int {
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i := len(s)
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for i--; i >= 0; i-- {
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if s[i] == b {
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break
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}
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}
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return i
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}
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