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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 (
"fmt"
"log"
"net"
"reflect"
"git.fd.io/govpp.git/codec"
"git.fd.io/govpp.git/examples/binapi/ip"
"git.fd.io/govpp.git/examples/binapi/ip_types"
)
func init() {
log.SetFlags(0)
}
func main() {
constructExample()
encodingExample()
// convert IP from string form into Address type containing union
convertIP("10.10.1.1")
convertIP("ff80::1")
}
func constructExample() {
var union ip_types.AddressUnion
// create AddressUnion with AdressUnionXXX constructors
union = ip_types.AddressUnionIP4(ip.IP4Address{192, 168, 1, 10})
union = ip_types.AddressUnionIP6(ip.IP6Address{0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x02})
// set AddressUnion with SetXXX methods
union.SetIP4(ip.IP4Address{192, 168, 1, 10})
union.SetIP6(ip.IP6Address{0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x02})
}
func encodingExample() {
var c codec.MsgCodec
// encode this message
var msg = ip.IPPuntRedirect{
Punt: ip.PuntRedirect{
Nh: ip_types.Address{
Af: ip_types.ADDRESS_IP4,
Un: ip_types.AddressUnionIP4(ip.IP4Address{192, 168, 1, 10}),
},
},
IsAdd: true,
}
log.Printf("encoding message: %+v", msg)
b, err := c.EncodeMsg(&msg, 1)
if err != nil {
log.Fatal(err)
}
// decode into this message
var msg2 ip.IPPuntRedirect
if err := c.DecodeMsg(b, &msg2); err != nil {
log.Fatal(err)
}
log.Printf("decoded message: %+v", msg2)
// compare the messages
if !reflect.DeepEqual(msg, msg2) {
log.Fatal("messages are not equal")
}
}
func convertIP(ip string) {
addr, err := ipToAddress(ip)
if err != nil {
log.Printf("error converting IP: %v", err)
return
}
fmt.Printf("converted IP %q to: %+v\n", ip, addr)
}
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_types.ADDRESS_IP6
var ip6addr ip.IP6Address
copy(ip6addr[:], netIP.To16())
addr.Un.SetIP6(ip6addr)
} else {
addr.Af = ip_types.ADDRESS_IP4
var ip4addr ip.IP4Address
copy(ip4addr[:], ip4.To4())
addr.Un.SetIP4(ip4addr)
}
return
}
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