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