frp/src/models/msg/udp.go

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2016-12-19 01:22:21 +08:00
// Copyright 2016 fatedier, fatedier@gmail.com
//
// 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.
package msg
import (
"encoding/base64"
"encoding/json"
"net"
)
type UdpPacket struct {
Content []byte `json:"-"`
Src *net.UDPAddr `json:"-"`
Dst *net.UDPAddr `json:"-"`
EncodeContent string `json:"content"`
SrcStr string `json:"src"`
DstStr string `json:"dst"`
}
func NewUdpPacket(content []byte, src, dst *net.UDPAddr) *UdpPacket {
up := &UdpPacket{
Src: src,
Dst: dst,
EncodeContent: base64.StdEncoding.EncodeToString(content),
SrcStr: src.String(),
DstStr: dst.String(),
}
return up
}
// parse one udp packet struct to bytes
func (up *UdpPacket) Pack() []byte {
b, _ := json.Marshal(up)
return b
}
// parse from bytes to UdpPacket struct
func (up *UdpPacket) UnPack(packet []byte) error {
err := json.Unmarshal(packet, &up)
if err != nil {
return err
}
up.Content, err = base64.StdEncoding.DecodeString(up.EncodeContent)
if err != nil {
return err
}
up.Src, err = net.ResolveUDPAddr("udp", up.SrcStr)
if err != nil {
return err
}
up.Dst, err = net.ResolveUDPAddr("udp", up.DstStr)
if err != nil {
return err
}
return nil
}