mirror of https://gitee.com/IrisVega/frp.git
113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
// Copyright 2017 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"crypto/md5"
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"crypto/rand"
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"encoding/hex"
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"fmt"
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"strconv"
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"strings"
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)
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// RandId return a rand string used in frp.
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func RandId() (id string, err error) {
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return RandIdWithLen(8)
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}
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// RandIdWithLen return a rand string with idLen length.
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func RandIdWithLen(idLen int) (id string, err error) {
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b := make([]byte, idLen)
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_, err = rand.Read(b)
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if err != nil {
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return
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}
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id = fmt.Sprintf("%x", b)
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return
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}
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func GetAuthKey(token string, timestamp int64) (key string) {
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token = token + fmt.Sprintf("%d", timestamp)
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md5Ctx := md5.New()
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md5Ctx.Write([]byte(token))
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data := md5Ctx.Sum(nil)
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return hex.EncodeToString(data)
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}
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// for example: rangeStr is "1000-2000,2001,2002,3000-4000", return an array as port ranges.
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func GetPortRanges(rangeStr string) (portRanges [][2]int64, err error) {
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// for example: 1000-2000,2001,2002,3000-4000
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rangeArray := strings.Split(rangeStr, ",")
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for _, portRangeStr := range rangeArray {
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// 1000-2000 or 2001
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portArray := strings.Split(portRangeStr, "-")
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// length: only 1 or 2 is correct
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rangeType := len(portArray)
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if rangeType == 1 {
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singlePort, err := strconv.ParseInt(portArray[0], 10, 64)
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if err != nil {
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return [][2]int64{}, err
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}
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portRanges = append(portRanges, [2]int64{singlePort, singlePort})
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} else if rangeType == 2 {
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min, err := strconv.ParseInt(portArray[0], 10, 64)
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if err != nil {
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return [][2]int64{}, err
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}
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max, err := strconv.ParseInt(portArray[1], 10, 64)
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if err != nil {
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return [][2]int64{}, err
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}
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if max < min {
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return [][2]int64{}, fmt.Errorf("range incorrect")
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}
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portRanges = append(portRanges, [2]int64{min, max})
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} else {
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return [][2]int64{}, fmt.Errorf("format error")
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}
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}
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return portRanges, nil
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}
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func ContainsPort(portRanges [][2]int64, port int64) bool {
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for _, pr := range portRanges {
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if port >= pr[0] && port <= pr[1] {
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return true
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}
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}
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return false
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}
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func PortRangesCut(portRanges [][2]int64, port int64) [][2]int64 {
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var tmpRanges [][2]int64
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for _, pr := range portRanges {
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if port >= pr[0] && port <= pr[1] {
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leftRange := [2]int64{pr[0], port - 1}
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rightRange := [2]int64{port + 1, pr[1]}
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if leftRange[0] <= leftRange[1] {
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tmpRanges = append(tmpRanges, leftRange)
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}
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if rightRange[0] <= rightRange[1] {
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tmpRanges = append(tmpRanges, rightRange)
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}
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} else {
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tmpRanges = append(tmpRanges, pr)
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}
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}
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return tmpRanges
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}
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