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// Copyright (c) 2018 Cisco and/or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// union-example is an example to show how to use unions in VPP binary API.
package main
import (
"bytes"
"fmt"
"log"
"net"
"git.fd.io/govpp.git/examples/bin_api/ip"
"github.com/lunixbochs/struc"
)
func main() {
encodingExample()
usageExample()
}
func encodingExample() {
// create union with IPv4 address
var unionIP4 ip.AddressUnion
unionIP4.SetIP4(ip.IP4Address{192, 168, 1, 10})
// use it in the Address type
addr := &ip.Address{
Af: ip.ADDRESS_IP4,
Un: ip.AddressUnionIP4(ip.IP4Address{192, 168, 1, 10}),
}
log.Printf("encoding union IPv4: %v", addr.Un.GetIP4())
// encode the address with union
data := encode(addr)
// decode the address with union
addr2 := decode(data)
log.Printf("decoded union IPv4: %v", addr2.Un.GetIP4())
}
func encode(addr *ip.Address) []byte {
log.Printf("encoding address: %#v", addr)
buf := new(bytes.Buffer)
if err := struc.Pack(buf, addr); err != nil {
panic(err)
}
return buf.Bytes()
}
func decode(data []byte) *ip.Address {
addr := new(ip.Address)
buf := bytes.NewReader(data)
if err := struc.Unpack(buf, addr); err != nil {
panic(err)
}
log.Printf("decoded address: %#v", addr)
return addr
}
func usageExample() {
var convAddr = func(ip string) {
addr, err := ipToAddress(ip)
if err != nil {
log.Printf("converting ip %q failed: %v", ip, err)
}
fmt.Printf("% 0X\n", addr)
}
convAddr("10.10.10.10")
convAddr("::1")
convAddr("")
}
func ipToAddress(ipstr string) (addr ip.Address, err error) {
netIP := net.ParseIP(ipstr)
if netIP == nil {
return ip.Address{}, fmt.Errorf("invalid IP: %q", ipstr)
}
if ip4 := netIP.To4(); ip4 == nil {
addr.Af = ip.ADDRESS_IP6
var ip6addr ip.IP6Address
copy(ip6addr[:], netIP.To16())
addr.Un.SetIP6(ip6addr)
} else {
addr.Af = ip.ADDRESS_IP4
var ip4addr ip.IP4Address
copy(ip4addr[:], ip4)
addr.Un.SetIP4(ip4addr)
}
return
}
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