mirror of https://github.com/schollz/croc.git
Zack
GitHub
commit
28ea514725
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@ -0,0 +1,3 @@
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# IDEs
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.idea/
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879
connect.go
879
connect.go
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@ -1,439 +1,440 @@
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package main
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import (
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"math"
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"net"
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"os"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/gosuri/uiprogress"
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"github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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)
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type Connection struct {
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Server string
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File FileMetaData
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NumberOfConnections int
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Code string
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HashedCode string
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IsSender bool
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Debug bool
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DontEncrypt bool
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bars []*uiprogress.Bar
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rate int
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}
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type FileMetaData struct {
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Name string
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Size int
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Hash string
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}
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func NewConnection(flags *Flags) *Connection {
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c := new(Connection)
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c.Debug = flags.Debug
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c.DontEncrypt = flags.DontEncrypt
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c.Server = flags.Server
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c.Code = flags.Code
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c.NumberOfConnections = flags.NumberOfConnections
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c.rate = flags.Rate
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if len(flags.File) > 0 {
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c.File.Name = flags.File
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c.IsSender = true
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} else {
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c.IsSender = false
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}
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log.SetFormatter(&log.TextFormatter{})
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if c.Debug {
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log.SetLevel(log.DebugLevel)
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} else {
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log.SetLevel(log.WarnLevel)
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}
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return c
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}
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func (c *Connection) Run() error {
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forceSingleThreaded := false
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if c.IsSender {
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fsize, err := FileSize(c.File.Name)
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if err != nil {
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return err
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}
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if fsize < MAX_NUMBER_THREADS*BUFFERSIZE {
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forceSingleThreaded = true
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log.Debug("forcing single thread")
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}
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}
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log.Debug("checking code validity")
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for {
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// check code
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goodCode := true
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m := strings.Split(c.Code, "-")
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log.Debug(m)
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numThreads, errParse := strconv.Atoi(m[0])
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if len(m) < 2 {
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goodCode = false
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log.Debug("code too short")
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} else if numThreads > MAX_NUMBER_THREADS || numThreads < 1 || (forceSingleThreaded && numThreads != 1) {
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c.NumberOfConnections = MAX_NUMBER_THREADS
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goodCode = false
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log.Debug("incorrect number of threads")
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} else if errParse != nil {
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goodCode = false
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log.Debug("problem parsing threads")
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}
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log.Debug(m)
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log.Debug(goodCode)
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if !goodCode {
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if c.IsSender {
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if forceSingleThreaded {
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c.NumberOfConnections = 1
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}
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c.Code = strconv.Itoa(c.NumberOfConnections) + "-" + GetRandomName()
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} else {
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if len(c.Code) != 0 {
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fmt.Println("Code must begin with number of threads (e.g. 3-some-code)")
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}
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c.Code = getInput("Enter receive code: ")
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}
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} else {
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break
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}
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}
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// assign number of connections
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c.NumberOfConnections, _ = strconv.Atoi(strings.Split(c.Code, "-")[0])
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if c.IsSender {
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if c.DontEncrypt {
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// don't encrypt
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CopyFile(c.File.Name, c.File.Name+".enc")
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} else {
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// encrypt
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log.Debug("encrypting...")
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if err := EncryptFile(c.File.Name, c.File.Name+".enc", c.Code); err != nil {
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return err
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}
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}
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// get file hash
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var err error
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c.File.Hash, err = HashFile(c.File.Name)
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if err != nil {
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return err
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}
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// get file size
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c.File.Size, err = FileSize(c.File.Name + ".enc")
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if err != nil {
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return err
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}
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fmt.Printf("Sending %d byte file named '%s'\n", c.File.Size, c.File.Name)
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fmt.Printf("Code is: %s\n", c.Code)
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}
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return c.runClient()
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}
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// runClient spawns threads for parallel uplink/downlink via TCP
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func (c *Connection) runClient() error {
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logger := log.WithFields(log.Fields{
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"code": c.Code,
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"sender?": c.IsSender,
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})
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c.HashedCode = Hash(c.Code)
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var wg sync.WaitGroup
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wg.Add(c.NumberOfConnections)
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uiprogress.Start()
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if !c.Debug {
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c.bars = make([]*uiprogress.Bar, c.NumberOfConnections)
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}
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gotOK := false
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gotResponse := false
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for id := 0; id < c.NumberOfConnections; id++ {
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go func(id int) {
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defer wg.Done()
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port := strconv.Itoa(27001 + id)
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connection, err := net.Dial("tcp", c.Server+":"+port)
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if err != nil {
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panic(err)
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}
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defer connection.Close()
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message := receiveMessage(connection)
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logger.Debugf("relay says: %s", message)
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if c.IsSender {
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logger.Debugf("telling relay: %s", "s."+c.Code)
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metaData, err := json.Marshal(c.File)
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if err != nil {
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log.Error(err)
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}
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encryptedMetaData, salt, iv := Encrypt(metaData, c.Code)
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sendMessage("s."+c.HashedCode+"."+hex.EncodeToString(encryptedMetaData)+"-"+salt+"-"+iv, connection)
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} else {
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logger.Debugf("telling relay: %s", "r."+c.Code)
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sendMessage("r."+c.HashedCode+".0.0.0", connection)
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}
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if c.IsSender { // this is a sender
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logger.Debug("waiting for ok from relay")
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message = receiveMessage(connection)
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logger.Debug("got ok from relay")
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if id == 0 {
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fmt.Printf("\nSending (->%s)..\n", message)
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}
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// wait for pipe to be made
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time.Sleep(100 * time.Millisecond)
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// Write data from file
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logger.Debug("send file")
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c.sendFile(id, connection)
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} else { // this is a receiver
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logger.Debug("waiting for meta data from sender")
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message = receiveMessage(connection)
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m := strings.Split(message, "-")
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encryptedData, salt, iv, sendersAddress := m[0], m[1], m[2], m[3]
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encryptedBytes, err := hex.DecodeString(encryptedData)
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if err != nil {
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log.Error(err)
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return
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}
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decryptedBytes, _ := Decrypt(encryptedBytes, c.Code, salt, iv, c.DontEncrypt)
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err = json.Unmarshal(decryptedBytes, &c.File)
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if err != nil {
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log.Error(err)
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return
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}
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log.Debugf("meta data received: %v", c.File)
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// have the main thread ask for the okay
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if id == 0 {
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fmt.Printf("Receiving file (%d bytes) into: %s\n", c.File.Size, c.File.Name)
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var sentFileNames []string
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if fileAlreadyExists(sentFileNames, c.File.Name) {
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fmt.Printf("Will not overwrite file!")
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os.Exit(1)
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}
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getOK := getInput("ok? (y/n): ")
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if getOK == "y" {
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gotOK = true
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sentFileNames = append(sentFileNames, c.File.Name)
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}
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gotResponse = true
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}
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// wait for the main thread to get the okay
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for limit := 0; limit < 1000; limit++ {
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if gotResponse {
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break
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}
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time.Sleep(10 * time.Millisecond)
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}
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if !gotOK {
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sendMessage("not ok", connection)
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} else {
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sendMessage("ok", connection)
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logger.Debug("receive file")
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if id == 0 {
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fmt.Printf("\n\nReceiving (<-%s)..\n", sendersAddress)
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}
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c.receiveFile(id, connection)
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}
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}
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}(id)
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}
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wg.Wait()
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if !c.IsSender {
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if !gotOK {
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return errors.New("Transfer interrupted")
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}
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c.catFile(c.File.Name)
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log.Debugf("Code: [%s]", c.Code)
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if c.DontEncrypt {
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if err := CopyFile(c.File.Name+".enc", c.File.Name); err != nil {
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return err
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}
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} else {
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if err := DecryptFile(c.File.Name+".enc", c.File.Name, c.Code); err != nil {
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return errors.Wrap(err, "Problem decrypting file")
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}
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}
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if !c.Debug {
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os.Remove(c.File.Name + ".enc")
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}
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fileHash, err := HashFile(c.File.Name)
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if err != nil {
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log.Error(err)
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}
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log.Debugf("\n\n\ndownloaded hash: [%s]", fileHash)
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log.Debugf("\n\n\nrelayed hash: [%s]", c.File.Hash)
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if c.File.Hash != fileHash {
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return fmt.Errorf("\nUh oh! %s is corrupted! Sorry, try again.\n", c.File.Name)
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} else {
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fmt.Printf("\nReceived file written to %s", c.File.Name)
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}
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} else {
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fmt.Println("File sent.")
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// TODO: Add confirmation
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}
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return nil
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}
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func fileAlreadyExists(s []string, f string) bool {
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for _, a := range s {
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if a == f {
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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 (c *Connection) catFile(fname string) {
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// cat the file
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os.Remove(fname)
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finished, err := os.Create(fname + ".enc")
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defer finished.Close()
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if err != nil {
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log.Fatal(err)
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}
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for id := 0; id < c.NumberOfConnections; id++ {
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fh, err := os.Open(fname + "." + strconv.Itoa(id))
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if err != nil {
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log.Fatal(err)
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}
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_, err = io.Copy(finished, fh)
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if err != nil {
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log.Fatal(err)
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}
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fh.Close()
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os.Remove(fname + "." + strconv.Itoa(id))
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}
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}
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func (c *Connection) receiveFile(id int, connection net.Conn) error {
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logger := log.WithFields(log.Fields{
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"function": "receiveFile #" + strconv.Itoa(id),
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})
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logger.Debug("waiting for chunk size from sender")
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fileSizeBuffer := make([]byte, 10)
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connection.Read(fileSizeBuffer)
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fileDataString := strings.Trim(string(fileSizeBuffer), ":")
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fileSizeInt, _ := strconv.Atoi(fileDataString)
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chunkSize := int64(fileSizeInt)
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logger.Debugf("chunk size: %d", chunkSize)
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os.Remove(c.File.Name + "." + strconv.Itoa(id))
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newFile, err := os.Create(c.File.Name + "." + strconv.Itoa(id))
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if err != nil {
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panic(err)
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}
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defer newFile.Close()
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if !c.Debug {
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c.bars[id] = uiprogress.AddBar(int(chunkSize)/1024 + 1).AppendCompleted().PrependElapsed()
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}
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logger.Debug("waiting for file")
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var receivedBytes int64
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receivedFirstBytes := false
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for {
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if !c.Debug {
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c.bars[id].Incr()
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}
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if (chunkSize - receivedBytes) < BUFFERSIZE {
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logger.Debug("at the end")
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io.CopyN(newFile, connection, (chunkSize - receivedBytes))
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// Empty the remaining bytes that we don't need from the network buffer
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if (receivedBytes+BUFFERSIZE)-chunkSize < BUFFERSIZE {
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logger.Debug("empty remaining bytes from network buffer")
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connection.Read(make([]byte, (receivedBytes+BUFFERSIZE)-chunkSize))
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}
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break
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}
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io.CopyN(newFile, connection, BUFFERSIZE)
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receivedBytes += BUFFERSIZE
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if !receivedFirstBytes {
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receivedFirstBytes = true
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logger.Debug("Receieved first bytes!")
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}
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}
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logger.Debug("received file")
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return nil
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}
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func (c *Connection) sendFile(id int, connection net.Conn) {
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logger := log.WithFields(log.Fields{
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"function": "sendFile #" + strconv.Itoa(id),
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})
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defer connection.Close()
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var err error
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numChunks := math.Ceil(float64(c.File.Size) / float64(BUFFERSIZE))
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chunksPerWorker := int(math.Ceil(numChunks / float64(c.NumberOfConnections)))
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chunkSize := int64(chunksPerWorker * BUFFERSIZE)
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if id+1 == c.NumberOfConnections {
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chunkSize = int64(c.File.Size) - int64(c.NumberOfConnections-1)*chunkSize
|
||||
}
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||||
|
||||
if id == 0 || id == c.NumberOfConnections-1 {
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logger.Debugf("numChunks: %v", numChunks)
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logger.Debugf("chunksPerWorker: %v", chunksPerWorker)
|
||||
logger.Debugf("bytesPerchunkSizeConnection: %v", chunkSize)
|
||||
}
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logger.Debugf("sending chunk size: %d", chunkSize)
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connection.Write([]byte(fillString(strconv.FormatInt(int64(chunkSize), 10), 10)))
|
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|
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sendBuffer := make([]byte, BUFFERSIZE)
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|
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// open encrypted file
|
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file, err := os.OpenFile(c.File.Name+".enc", os.O_RDONLY, 0755)
|
||||
if err != nil {
|
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log.Error(err)
|
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return
|
||||
}
|
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defer file.Close()
|
||||
|
||||
chunkI := 0
|
||||
if !c.Debug {
|
||||
c.bars[id] = uiprogress.AddBar(chunksPerWorker).AppendCompleted().PrependElapsed()
|
||||
}
|
||||
|
||||
bufferSizeInKilobytes := BUFFERSIZE / 1024
|
||||
rate := float64(c.rate) / float64(c.NumberOfConnections*bufferSizeInKilobytes)
|
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throttle := time.NewTicker(time.Second / time.Duration(rate))
|
||||
defer throttle.Stop()
|
||||
|
||||
for range throttle.C {
|
||||
_, err = file.Read(sendBuffer)
|
||||
if err == io.EOF {
|
||||
//End of file reached, break out of for loop
|
||||
logger.Debug("EOF")
|
||||
break
|
||||
}
|
||||
if (chunkI >= chunksPerWorker*id && chunkI < chunksPerWorker*id+chunksPerWorker) || (id == c.NumberOfConnections-1 && chunkI >= chunksPerWorker*id) {
|
||||
connection.Write(sendBuffer)
|
||||
if !c.Debug {
|
||||
c.bars[id].Incr()
|
||||
}
|
||||
}
|
||||
chunkI++
|
||||
}
|
||||
logger.Debug("file is sent")
|
||||
return
|
||||
}
|
||||
package main
|
||||
|
||||
import (
|
||||
"encoding/hex"
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"io"
|
||||
"math"
|
||||
"net"
|
||||
"os"
|
||||
"strconv"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/gosuri/uiprogress"
|
||||
"github.com/pkg/errors"
|
||||
log "github.com/sirupsen/logrus"
|
||||
)
|
||||
|
||||
type Connection struct {
|
||||
Server string
|
||||
File FileMetaData
|
||||
NumberOfConnections int
|
||||
Code string
|
||||
HashedCode string
|
||||
IsSender bool
|
||||
Debug bool
|
||||
DontEncrypt bool
|
||||
bars []*uiprogress.Bar
|
||||
rate int
|
||||
}
|
||||
|
||||
type FileMetaData struct {
|
||||
Name string
|
||||
Size int
|
||||
Hash string
|
||||
}
|
||||
|
||||
func NewConnection(flags *Flags) *Connection {
|
||||
c := new(Connection)
|
||||
c.Debug = flags.Debug
|
||||
c.DontEncrypt = flags.DontEncrypt
|
||||
c.Server = flags.Server
|
||||
c.Code = flags.Code
|
||||
c.NumberOfConnections = flags.NumberOfConnections
|
||||
c.rate = flags.Rate
|
||||
if len(flags.File) > 0 {
|
||||
c.File.Name = flags.File
|
||||
c.IsSender = true
|
||||
} else {
|
||||
c.IsSender = false
|
||||
}
|
||||
|
||||
log.SetFormatter(&log.TextFormatter{})
|
||||
if c.Debug {
|
||||
log.SetLevel(log.DebugLevel)
|
||||
} else {
|
||||
log.SetLevel(log.WarnLevel)
|
||||
}
|
||||
|
||||
return c
|
||||
}
|
||||
|
||||
func (c *Connection) Run() error {
|
||||
forceSingleThreaded := false
|
||||
if c.IsSender {
|
||||
fsize, err := FileSize(c.File.Name)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if fsize < MAX_NUMBER_THREADS*BUFFERSIZE {
|
||||
forceSingleThreaded = true
|
||||
log.Debug("forcing single thread")
|
||||
}
|
||||
}
|
||||
log.Debug("checking code validity")
|
||||
for {
|
||||
// check code
|
||||
goodCode := true
|
||||
m := strings.Split(c.Code, "-")
|
||||
numThreads, errParse := strconv.Atoi(m[0])
|
||||
if len(m) < 2 {
|
||||
goodCode = false
|
||||
} else if numThreads > MAX_NUMBER_THREADS || numThreads < 1 || (forceSingleThreaded && numThreads != 1) {
|
||||
c.NumberOfConnections = MAX_NUMBER_THREADS
|
||||
goodCode = false
|
||||
} else if errParse != nil {
|
||||
goodCode = false
|
||||
}
|
||||
log.Debug(m)
|
||||
if !goodCode {
|
||||
if c.IsSender {
|
||||
if forceSingleThreaded {
|
||||
c.NumberOfConnections = 1
|
||||
}
|
||||
c.Code = strconv.Itoa(c.NumberOfConnections) + "-" + GetRandomName()
|
||||
} else {
|
||||
if len(c.Code) != 0 {
|
||||
fmt.Println("Code must begin with number of threads (e.g. 3-some-code)")
|
||||
}
|
||||
c.Code = getInput("Enter receive code: ")
|
||||
}
|
||||
} else {
|
||||
break
|
||||
}
|
||||
}
|
||||
// assign number of connections
|
||||
c.NumberOfConnections, _ = strconv.Atoi(strings.Split(c.Code, "-")[0])
|
||||
|
||||
if c.IsSender {
|
||||
if c.DontEncrypt {
|
||||
// don't encrypt
|
||||
CopyFile(c.File.Name, c.File.Name+".enc")
|
||||
} else {
|
||||
// encrypt
|
||||
log.Debug("encrypting...")
|
||||
if err := EncryptFile(c.File.Name, c.File.Name+".enc", c.Code); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
// get file hash
|
||||
var err error
|
||||
c.File.Hash, err = HashFile(c.File.Name)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
// get file size
|
||||
c.File.Size, err = FileSize(c.File.Name + ".enc")
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
return c.runClient()
|
||||
}
|
||||
|
||||
// runClient spawns threads for parallel uplink/downlink via TCP
|
||||
func (c *Connection) runClient() error {
|
||||
logger := log.WithFields(log.Fields{
|
||||
"code": c.Code,
|
||||
"sender?": c.IsSender,
|
||||
})
|
||||
|
||||
c.HashedCode = Hash(c.Code)
|
||||
|
||||
var wg sync.WaitGroup
|
||||
wg.Add(c.NumberOfConnections)
|
||||
|
||||
uiprogress.Start()
|
||||
if !c.Debug {
|
||||
c.bars = make([]*uiprogress.Bar, c.NumberOfConnections)
|
||||
}
|
||||
gotOK := false
|
||||
gotResponse := false
|
||||
gotConnectionInUse := false
|
||||
for id := 0; id < c.NumberOfConnections; id++ {
|
||||
go func(id int) {
|
||||
defer wg.Done()
|
||||
port := strconv.Itoa(27001 + id)
|
||||
connection, err := net.Dial("tcp", c.Server+":"+port)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer connection.Close()
|
||||
|
||||
message := receiveMessage(connection)
|
||||
logger.Debugf("relay says: %s", message)
|
||||
if c.IsSender {
|
||||
logger.Debugf("telling relay: %s", "s."+c.Code)
|
||||
metaData, err := json.Marshal(c.File)
|
||||
if err != nil {
|
||||
log.Error(err)
|
||||
}
|
||||
encryptedMetaData, salt, iv := Encrypt(metaData, c.Code)
|
||||
sendMessage("s."+c.HashedCode+"."+hex.EncodeToString(encryptedMetaData)+"-"+salt+"-"+iv, connection)
|
||||
} else {
|
||||
logger.Debugf("telling relay: %s", "r."+c.Code)
|
||||
sendMessage("r."+c.HashedCode+".0.0.0", connection)
|
||||
}
|
||||
if c.IsSender { // this is a sender
|
||||
logger.Debug("waiting for ok from relay")
|
||||
message = receiveMessage(connection)
|
||||
if message == "no" {
|
||||
fmt.Println("The specifed code is already in use by a sender.")
|
||||
gotConnectionInUse = true
|
||||
} else {
|
||||
logger.Debug("got ok from relay")
|
||||
if id == 0 {
|
||||
fmt.Printf("\nSending (->%s)..\n", message)
|
||||
}
|
||||
// wait for pipe to be made
|
||||
time.Sleep(100 * time.Millisecond)
|
||||
// Write data from file
|
||||
logger.Debug("send file")
|
||||
c.sendFile(id, connection)
|
||||
fmt.Println("File sent.")
|
||||
}
|
||||
} else { // this is a receiver
|
||||
logger.Debug("waiting for meta data from sender")
|
||||
message = receiveMessage(connection)
|
||||
if message == "no" {
|
||||
fmt.Println("The specifed code is already in use by a receiver.")
|
||||
gotConnectionInUse = true
|
||||
} else {
|
||||
m := strings.Split(message, "-")
|
||||
encryptedData, salt, iv, sendersAddress := m[0], m[1], m[2], m[3]
|
||||
encryptedBytes, err := hex.DecodeString(encryptedData)
|
||||
if err != nil {
|
||||
log.Error(err)
|
||||
return
|
||||
}
|
||||
decryptedBytes, _ := Decrypt(encryptedBytes, c.Code, salt, iv, c.DontEncrypt)
|
||||
err = json.Unmarshal(decryptedBytes, &c.File)
|
||||
if err != nil {
|
||||
log.Error(err)
|
||||
return
|
||||
}
|
||||
log.Debugf("meta data received: %v", c.File)
|
||||
// have the main thread ask for the okay
|
||||
if id == 0 {
|
||||
fmt.Printf("Receiving file (%d bytes) into: %s\n", c.File.Size, c.File.Name)
|
||||
var sentFileNames []string
|
||||
|
||||
if fileAlreadyExists(sentFileNames, c.File.Name) {
|
||||
fmt.Printf("Will not overwrite file!")
|
||||
os.Exit(1)
|
||||
}
|
||||
getOK := getInput("ok? (y/n): ")
|
||||
if getOK == "y" {
|
||||
gotOK = true
|
||||
sentFileNames = append(sentFileNames, c.File.Name)
|
||||
}
|
||||
gotResponse = true
|
||||
}
|
||||
// wait for the main thread to get the okay
|
||||
for limit := 0; limit < 1000; limit++ {
|
||||
if gotResponse {
|
||||
break
|
||||
}
|
||||
time.Sleep(10 * time.Millisecond)
|
||||
}
|
||||
if !gotOK {
|
||||
sendMessage("not ok", connection)
|
||||
} else {
|
||||
sendMessage("ok", connection)
|
||||
logger.Debug("receive file")
|
||||
fmt.Printf("\n\nReceiving (<-%s)..\n", sendersAddress)
|
||||
c.receiveFile(id, connection)
|
||||
}
|
||||
}
|
||||
}
|
||||
}(id)
|
||||
}
|
||||
wg.Wait()
|
||||
|
||||
if gotConnectionInUse {
|
||||
return nil // connection was in use, just quit cleanly
|
||||
}
|
||||
|
||||
if c.IsSender {
|
||||
// TODO: Add confirmation
|
||||
} else { // Is a Receiver
|
||||
if !gotOK {
|
||||
return errors.New("Transfer interrupted")
|
||||
}
|
||||
c.catFile(c.File.Name)
|
||||
log.Debugf("Code: [%s]", c.Code)
|
||||
if c.DontEncrypt {
|
||||
if err := CopyFile(c.File.Name+".enc", c.File.Name); err != nil {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
if err := DecryptFile(c.File.Name+".enc", c.File.Name, c.Code); err != nil {
|
||||
return errors.Wrap(err, "Problem decrypting file")
|
||||
}
|
||||
}
|
||||
if !c.Debug {
|
||||
os.Remove(c.File.Name + ".enc")
|
||||
}
|
||||
|
||||
fileHash, err := HashFile(c.File.Name)
|
||||
if err != nil {
|
||||
log.Error(err)
|
||||
}
|
||||
log.Debugf("\n\n\ndownloaded hash: [%s]", fileHash)
|
||||
log.Debugf("\n\n\nrelayed hash: [%s]", c.File.Hash)
|
||||
|
||||
if c.File.Hash != fileHash {
|
||||
return fmt.Errorf("\nUh oh! %s is corrupted! Sorry, try again.\n", c.File.Name)
|
||||
} else {
|
||||
fmt.Printf("\nReceived file written to %s", c.File.Name)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func fileAlreadyExists(s []string, f string) bool {
|
||||
for _, a := range s {
|
||||
if a == f {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func (c *Connection) catFile(fname string) {
|
||||
// cat the file
|
||||
os.Remove(fname)
|
||||
finished, err := os.Create(fname + ".enc")
|
||||
defer finished.Close()
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
for id := 0; id < c.NumberOfConnections; id++ {
|
||||
fh, err := os.Open(fname + "." + strconv.Itoa(id))
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
_, err = io.Copy(finished, fh)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
fh.Close()
|
||||
os.Remove(fname + "." + strconv.Itoa(id))
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func (c *Connection) receiveFile(id int, connection net.Conn) error {
|
||||
logger := log.WithFields(log.Fields{
|
||||
"function": "receiveFile #" + strconv.Itoa(id),
|
||||
})
|
||||
|
||||
logger.Debug("waiting for chunk size from sender")
|
||||
fileSizeBuffer := make([]byte, 10)
|
||||
connection.Read(fileSizeBuffer)
|
||||
fileDataString := strings.Trim(string(fileSizeBuffer), ":")
|
||||
fileSizeInt, _ := strconv.Atoi(fileDataString)
|
||||
chunkSize := int64(fileSizeInt)
|
||||
logger.Debugf("chunk size: %d", chunkSize)
|
||||
|
||||
os.Remove(c.File.Name + "." + strconv.Itoa(id))
|
||||
newFile, err := os.Create(c.File.Name + "." + strconv.Itoa(id))
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer newFile.Close()
|
||||
|
||||
if !c.Debug {
|
||||
c.bars[id] = uiprogress.AddBar(int(chunkSize)/1024 + 1).AppendCompleted().PrependElapsed()
|
||||
}
|
||||
|
||||
logger.Debug("waiting for file")
|
||||
var receivedBytes int64
|
||||
for {
|
||||
if !c.Debug {
|
||||
c.bars[id].Incr()
|
||||
}
|
||||
if (chunkSize - receivedBytes) < BUFFERSIZE {
|
||||
logger.Debug("at the end")
|
||||
io.CopyN(newFile, connection, (chunkSize - receivedBytes))
|
||||
// Empty the remaining bytes that we don't need from the network buffer
|
||||
if (receivedBytes+BUFFERSIZE)-chunkSize < BUFFERSIZE {
|
||||
logger.Debug("empty remaining bytes from network buffer")
|
||||
connection.Read(make([]byte, (receivedBytes+BUFFERSIZE)-chunkSize))
|
||||
}
|
||||
break
|
||||
}
|
||||
io.CopyN(newFile, connection, BUFFERSIZE)
|
||||
receivedBytes += BUFFERSIZE
|
||||
}
|
||||
logger.Debug("received file")
|
||||
return nil
|
||||
}
|
||||
|
||||
func (c *Connection) sendFile(id int, connection net.Conn) {
|
||||
logger := log.WithFields(log.Fields{
|
||||
"function": "sendFile #" + strconv.Itoa(id),
|
||||
})
|
||||
defer connection.Close()
|
||||
|
||||
var err error
|
||||
|
||||
numChunks := math.Ceil(float64(c.File.Size) / float64(BUFFERSIZE))
|
||||
chunksPerWorker := int(math.Ceil(numChunks / float64(c.NumberOfConnections)))
|
||||
|
||||
chunkSize := int64(chunksPerWorker * BUFFERSIZE)
|
||||
if id+1 == c.NumberOfConnections {
|
||||
chunkSize = int64(c.File.Size) - int64(c.NumberOfConnections-1)*chunkSize
|
||||
}
|
||||
|
||||
if id == 0 || id == c.NumberOfConnections-1 {
|
||||
logger.Debugf("numChunks: %v", numChunks)
|
||||
logger.Debugf("chunksPerWorker: %v", chunksPerWorker)
|
||||
logger.Debugf("bytesPerchunkSizeConnection: %v", chunkSize)
|
||||
}
|
||||
|
||||
logger.Debugf("sending chunk size: %d", chunkSize)
|
||||
connection.Write([]byte(fillString(strconv.FormatInt(int64(chunkSize), 10), 10)))
|
||||
|
||||
sendBuffer := make([]byte, BUFFERSIZE)
|
||||
|
||||
// open encrypted file
|
||||
file, err := os.Open(c.File.Name + ".enc")
|
||||
if err != nil {
|
||||
log.Error(err)
|
||||
return
|
||||
}
|
||||
defer file.Close()
|
||||
|
||||
chunkI := 0
|
||||
if !c.Debug {
|
||||
c.bars[id] = uiprogress.AddBar(chunksPerWorker).AppendCompleted().PrependElapsed()
|
||||
}
|
||||
|
||||
bufferSizeInKilobytes := BUFFERSIZE / 1024
|
||||
rate := float64(c.rate) / float64(c.NumberOfConnections*bufferSizeInKilobytes)
|
||||
throttle := time.NewTicker(time.Second / time.Duration(rate))
|
||||
defer throttle.Stop()
|
||||
|
||||
for range throttle.C {
|
||||
_, err = file.Read(sendBuffer)
|
||||
if err == io.EOF {
|
||||
//End of file reached, break out of for loop
|
||||
logger.Debug("EOF")
|
||||
break
|
||||
}
|
||||
if (chunkI >= chunksPerWorker*id && chunkI < chunksPerWorker*id+chunksPerWorker) || (id == c.NumberOfConnections-1 && chunkI >= chunksPerWorker*id) {
|
||||
connection.Write(sendBuffer)
|
||||
if !c.Debug {
|
||||
c.bars[id].Incr()
|
||||
}
|
||||
}
|
||||
chunkI++
|
||||
}
|
||||
logger.Debug("file is sent")
|
||||
return
|
||||
}
|
||||
|
|
|
|||
|
|
@ -45,4 +45,5 @@ func TestEncryptFiles(t *testing.T) {
|
|||
}
|
||||
os.Remove("temp.dec")
|
||||
os.Remove("temp.enc")
|
||||
os.Remove("temp")
|
||||
}
|
||||
|
|
|
|||
528
relay.go
528
relay.go
|
|
@ -1,248 +1,280 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"net"
|
||||
"strconv"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/pkg/errors"
|
||||
log "github.com/sirupsen/logrus"
|
||||
)
|
||||
|
||||
const MAX_NUMBER_THREADS = 8
|
||||
|
||||
type connectionMap struct {
|
||||
reciever map[string]net.Conn
|
||||
sender map[string]net.Conn
|
||||
metadata map[string]string
|
||||
sync.RWMutex
|
||||
}
|
||||
|
||||
type Relay struct {
|
||||
connections connectionMap
|
||||
Debug bool
|
||||
NumberOfConnections int
|
||||
}
|
||||
|
||||
func NewRelay(flags *Flags) *Relay {
|
||||
r := new(Relay)
|
||||
r.Debug = flags.Debug
|
||||
r.NumberOfConnections = MAX_NUMBER_THREADS
|
||||
log.SetFormatter(&log.TextFormatter{})
|
||||
if r.Debug {
|
||||
log.SetLevel(log.DebugLevel)
|
||||
} else {
|
||||
log.SetLevel(log.WarnLevel)
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
func (r *Relay) Run() {
|
||||
r.connections = connectionMap{}
|
||||
r.connections.Lock()
|
||||
r.connections.reciever = make(map[string]net.Conn)
|
||||
r.connections.sender = make(map[string]net.Conn)
|
||||
r.connections.metadata = make(map[string]string)
|
||||
r.connections.Unlock()
|
||||
r.runServer()
|
||||
}
|
||||
|
||||
func (r *Relay) runServer() {
|
||||
logger := log.WithFields(log.Fields{
|
||||
"function": "main",
|
||||
})
|
||||
logger.Debug("Initializing")
|
||||
var wg sync.WaitGroup
|
||||
wg.Add(r.NumberOfConnections)
|
||||
for id := 0; id < r.NumberOfConnections; id++ {
|
||||
go r.listenerThread(id, &wg)
|
||||
}
|
||||
wg.Wait()
|
||||
}
|
||||
|
||||
func (r *Relay) listenerThread(id int, wg *sync.WaitGroup) {
|
||||
logger := log.WithFields(log.Fields{
|
||||
"function": "listenerThread:" + strconv.Itoa(27000+id),
|
||||
})
|
||||
|
||||
defer wg.Done()
|
||||
err := r.listener(id)
|
||||
if err != nil {
|
||||
logger.Error(err)
|
||||
}
|
||||
}
|
||||
|
||||
func (r *Relay) listener(id int) (err error) {
|
||||
port := strconv.Itoa(27001 + id)
|
||||
logger := log.WithFields(log.Fields{
|
||||
"function": "listener" + ":" + port,
|
||||
})
|
||||
server, err := net.Listen("tcp", "0.0.0.0:"+port)
|
||||
if err != nil {
|
||||
return errors.Wrap(err, "Error listening on "+":"+port)
|
||||
}
|
||||
defer server.Close()
|
||||
logger.Debug("waiting for connections")
|
||||
//Spawn a new goroutine whenever a client connects
|
||||
for {
|
||||
connection, err := server.Accept()
|
||||
if err != nil {
|
||||
return errors.Wrap(err, "problem accepting connection")
|
||||
}
|
||||
logger.Debugf("Client %s connected", connection.RemoteAddr().String())
|
||||
go r.clientCommuncation(id, connection)
|
||||
}
|
||||
}
|
||||
|
||||
func (r *Relay) clientCommuncation(id int, connection net.Conn) {
|
||||
sendMessage("who?", connection)
|
||||
|
||||
m := strings.Split(receiveMessage(connection), ".")
|
||||
connectionType, codePhrase, metaData := m[0], m[1], m[2]
|
||||
key := codePhrase + "-" + strconv.Itoa(id)
|
||||
logger := log.WithFields(log.Fields{
|
||||
"id": id,
|
||||
"codePhrase": codePhrase,
|
||||
})
|
||||
|
||||
if connectionType == "s" {
|
||||
logger.Debug("got sender")
|
||||
r.connections.Lock()
|
||||
r.connections.metadata[key] = metaData
|
||||
r.connections.sender[key] = connection
|
||||
r.connections.Unlock()
|
||||
// wait for receiver
|
||||
receiversAddress := ""
|
||||
for {
|
||||
r.connections.RLock()
|
||||
if _, ok := r.connections.reciever[key]; ok {
|
||||
receiversAddress = r.connections.reciever[key].RemoteAddr().String()
|
||||
logger.Debug("got reciever")
|
||||
r.connections.RUnlock()
|
||||
break
|
||||
}
|
||||
r.connections.RUnlock()
|
||||
time.Sleep(100 * time.Millisecond)
|
||||
}
|
||||
logger.Debug("telling sender ok")
|
||||
sendMessage(receiversAddress, connection)
|
||||
logger.Debug("preparing pipe")
|
||||
r.connections.Lock()
|
||||
con1 := r.connections.sender[key]
|
||||
con2 := r.connections.reciever[key]
|
||||
r.connections.Unlock()
|
||||
logger.Debug("piping connections")
|
||||
Pipe(con1, con2)
|
||||
logger.Debug("done piping")
|
||||
r.connections.Lock()
|
||||
delete(r.connections.sender, key)
|
||||
delete(r.connections.reciever, key)
|
||||
delete(r.connections.metadata, key)
|
||||
r.connections.Unlock()
|
||||
logger.Debug("deleted sender and receiver")
|
||||
} else {
|
||||
// wait for sender's metadata
|
||||
sendersAddress := ""
|
||||
for {
|
||||
r.connections.RLock()
|
||||
if _, ok := r.connections.metadata[key]; ok {
|
||||
if _, ok2 := r.connections.sender[key]; ok2 {
|
||||
sendersAddress = r.connections.sender[key].RemoteAddr().String()
|
||||
logger.Debug("got sender meta data")
|
||||
r.connections.RUnlock()
|
||||
break
|
||||
}
|
||||
}
|
||||
r.connections.RUnlock()
|
||||
time.Sleep(100 * time.Millisecond)
|
||||
}
|
||||
// send meta data
|
||||
r.connections.RLock()
|
||||
sendMessage(r.connections.metadata[key]+"-"+sendersAddress, connection)
|
||||
r.connections.RUnlock()
|
||||
// check for receiver's consent
|
||||
consent := receiveMessage(connection)
|
||||
logger.Debugf("consent: %s", consent)
|
||||
if consent == "ok" {
|
||||
logger.Debug("got consent")
|
||||
r.connections.Lock()
|
||||
r.connections.reciever[key] = connection
|
||||
r.connections.Unlock()
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func sendMessage(message string, connection net.Conn) {
|
||||
message = fillString(message, BUFFERSIZE)
|
||||
connection.Write([]byte(message))
|
||||
}
|
||||
|
||||
func receiveMessage(connection net.Conn) string {
|
||||
messageByte := make([]byte, BUFFERSIZE)
|
||||
connection.Read(messageByte)
|
||||
return strings.Replace(string(messageByte), ":", "", -1)
|
||||
}
|
||||
|
||||
func fillString(retunString string, toLength int) string {
|
||||
for {
|
||||
lengthString := len(retunString)
|
||||
if lengthString < toLength {
|
||||
retunString = retunString + ":"
|
||||
continue
|
||||
}
|
||||
break
|
||||
}
|
||||
return retunString
|
||||
}
|
||||
|
||||
// chanFromConn creates a channel from a Conn object, and sends everything it
|
||||
// Read()s from the socket to the channel.
|
||||
func chanFromConn(conn net.Conn) chan []byte {
|
||||
c := make(chan []byte)
|
||||
|
||||
go func() {
|
||||
b := make([]byte, BUFFERSIZE)
|
||||
|
||||
for {
|
||||
n, err := conn.Read(b)
|
||||
if n > 0 {
|
||||
res := make([]byte, n)
|
||||
// Copy the buffer so it doesn't get changed while read by the recipient.
|
||||
copy(res, b[:n])
|
||||
c <- res
|
||||
}
|
||||
if err != nil {
|
||||
c <- nil
|
||||
break
|
||||
}
|
||||
}
|
||||
}()
|
||||
|
||||
return c
|
||||
}
|
||||
|
||||
// Pipe creates a full-duplex pipe between the two sockets and transfers data from one to the other.
|
||||
func Pipe(conn1 net.Conn, conn2 net.Conn) {
|
||||
chan1 := chanFromConn(conn1)
|
||||
chan2 := chanFromConn(conn2)
|
||||
|
||||
for {
|
||||
select {
|
||||
case b1 := <-chan1:
|
||||
if b1 == nil {
|
||||
return
|
||||
} else {
|
||||
conn2.Write(b1)
|
||||
}
|
||||
case b2 := <-chan2:
|
||||
if b2 == nil {
|
||||
return
|
||||
} else {
|
||||
conn1.Write(b2)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
package main
|
||||
|
||||
import (
|
||||
"net"
|
||||
"strconv"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/pkg/errors"
|
||||
log "github.com/sirupsen/logrus"
|
||||
)
|
||||
|
||||
const MAX_NUMBER_THREADS = 8
|
||||
|
||||
type connectionMap struct {
|
||||
receiver map[string]net.Conn
|
||||
sender map[string]net.Conn
|
||||
metadata map[string]string
|
||||
potentialReceivers map[string]struct{}
|
||||
sync.RWMutex
|
||||
}
|
||||
|
||||
func (c *connectionMap) IsSenderConnected(key string) (found bool) {
|
||||
c.RLock()
|
||||
defer c.RUnlock()
|
||||
_, found = c.sender[key]
|
||||
return
|
||||
}
|
||||
|
||||
func (c *connectionMap) IsPotentialReceiverConnected(key string) (found bool) {
|
||||
c.RLock()
|
||||
defer c.RUnlock()
|
||||
_, found = c.potentialReceivers[key]
|
||||
return
|
||||
}
|
||||
|
||||
type Relay struct {
|
||||
connections connectionMap
|
||||
Debug bool
|
||||
NumberOfConnections int
|
||||
}
|
||||
|
||||
func NewRelay(flags *Flags) *Relay {
|
||||
r := new(Relay)
|
||||
r.Debug = flags.Debug
|
||||
r.NumberOfConnections = MAX_NUMBER_THREADS
|
||||
log.SetFormatter(&log.TextFormatter{})
|
||||
if r.Debug {
|
||||
log.SetLevel(log.DebugLevel)
|
||||
} else {
|
||||
log.SetLevel(log.WarnLevel)
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
func (r *Relay) Run() {
|
||||
r.connections = connectionMap{}
|
||||
r.connections.Lock()
|
||||
r.connections.receiver = make(map[string]net.Conn)
|
||||
r.connections.sender = make(map[string]net.Conn)
|
||||
r.connections.metadata = make(map[string]string)
|
||||
r.connections.potentialReceivers = make(map[string]struct{})
|
||||
r.connections.Unlock()
|
||||
r.runServer()
|
||||
}
|
||||
|
||||
func (r *Relay) runServer() {
|
||||
logger := log.WithFields(log.Fields{
|
||||
"function": "main",
|
||||
})
|
||||
logger.Debug("Initializing")
|
||||
var wg sync.WaitGroup
|
||||
wg.Add(r.NumberOfConnections)
|
||||
for id := 0; id < r.NumberOfConnections; id++ {
|
||||
go r.listenerThread(id, &wg)
|
||||
}
|
||||
wg.Wait()
|
||||
}
|
||||
|
||||
func (r *Relay) listenerThread(id int, wg *sync.WaitGroup) {
|
||||
logger := log.WithFields(log.Fields{
|
||||
"function": "listenerThread:" + strconv.Itoa(27000+id),
|
||||
})
|
||||
|
||||
defer wg.Done()
|
||||
err := r.listener(id)
|
||||
if err != nil {
|
||||
logger.Error(err)
|
||||
}
|
||||
}
|
||||
|
||||
func (r *Relay) listener(id int) (err error) {
|
||||
port := strconv.Itoa(27001 + id)
|
||||
logger := log.WithFields(log.Fields{
|
||||
"function": "listener" + ":" + port,
|
||||
})
|
||||
server, err := net.Listen("tcp", "0.0.0.0:"+port)
|
||||
if err != nil {
|
||||
return errors.Wrap(err, "Error listening on "+":"+port)
|
||||
}
|
||||
defer server.Close()
|
||||
logger.Debug("waiting for connections")
|
||||
//Spawn a new goroutine whenever a client connects
|
||||
for {
|
||||
connection, err := server.Accept()
|
||||
if err != nil {
|
||||
return errors.Wrap(err, "problem accepting connection")
|
||||
}
|
||||
logger.Debugf("Client %s connected", connection.RemoteAddr().String())
|
||||
go r.clientCommuncation(id, connection)
|
||||
}
|
||||
}
|
||||
|
||||
func (r *Relay) clientCommuncation(id int, connection net.Conn) {
|
||||
sendMessage("who?", connection)
|
||||
|
||||
m := strings.Split(receiveMessage(connection), ".")
|
||||
connectionType, codePhrase, metaData := m[0], m[1], m[2]
|
||||
key := codePhrase + "-" + strconv.Itoa(id)
|
||||
logger := log.WithFields(log.Fields{
|
||||
"id": id,
|
||||
"codePhrase": codePhrase,
|
||||
})
|
||||
|
||||
if connectionType == "s" { // sender connection
|
||||
if r.connections.IsSenderConnected(key) {
|
||||
sendMessage("no", connection)
|
||||
return
|
||||
}
|
||||
|
||||
logger.Debug("got sender")
|
||||
r.connections.Lock()
|
||||
r.connections.metadata[key] = metaData
|
||||
r.connections.sender[key] = connection
|
||||
r.connections.Unlock()
|
||||
// wait for receiver
|
||||
receiversAddress := ""
|
||||
for {
|
||||
r.connections.RLock()
|
||||
if _, ok := r.connections.receiver[key]; ok {
|
||||
receiversAddress = r.connections.receiver[key].RemoteAddr().String()
|
||||
logger.Debug("got receiver")
|
||||
r.connections.RUnlock()
|
||||
break
|
||||
}
|
||||
r.connections.RUnlock()
|
||||
time.Sleep(100 * time.Millisecond)
|
||||
}
|
||||
logger.Debug("telling sender ok")
|
||||
sendMessage(receiversAddress, connection)
|
||||
logger.Debug("preparing pipe")
|
||||
r.connections.Lock()
|
||||
con1 := r.connections.sender[key]
|
||||
con2 := r.connections.receiver[key]
|
||||
r.connections.Unlock()
|
||||
logger.Debug("piping connections")
|
||||
Pipe(con1, con2)
|
||||
logger.Debug("done piping")
|
||||
r.connections.Lock()
|
||||
delete(r.connections.sender, key)
|
||||
delete(r.connections.receiver, key)
|
||||
delete(r.connections.metadata, key)
|
||||
delete(r.connections.potentialReceivers, key)
|
||||
r.connections.Unlock()
|
||||
logger.Debug("deleted sender and receiver")
|
||||
} else { //receiver connection "r"
|
||||
if r.connections.IsPotentialReceiverConnected(key) {
|
||||
sendMessage("no", connection)
|
||||
return
|
||||
}
|
||||
|
||||
// add as a potential receiver
|
||||
r.connections.Lock()
|
||||
r.connections.potentialReceivers[key] = struct{}{}
|
||||
r.connections.Unlock()
|
||||
|
||||
// wait for sender's metadata
|
||||
sendersAddress := ""
|
||||
for {
|
||||
r.connections.RLock()
|
||||
if _, ok := r.connections.metadata[key]; ok {
|
||||
if _, ok2 := r.connections.sender[key]; ok2 {
|
||||
sendersAddress = r.connections.sender[key].RemoteAddr().String()
|
||||
logger.Debug("got sender meta data")
|
||||
r.connections.RUnlock()
|
||||
break
|
||||
}
|
||||
}
|
||||
r.connections.RUnlock()
|
||||
time.Sleep(100 * time.Millisecond)
|
||||
}
|
||||
// send meta data
|
||||
r.connections.RLock()
|
||||
sendMessage(r.connections.metadata[key]+"-"+sendersAddress, connection)
|
||||
r.connections.RUnlock()
|
||||
// check for receiver's consent
|
||||
consent := receiveMessage(connection)
|
||||
logger.Debugf("consent: %s", consent)
|
||||
if consent == "ok" {
|
||||
logger.Debug("got consent")
|
||||
r.connections.Lock()
|
||||
r.connections.receiver[key] = connection
|
||||
r.connections.Unlock()
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func sendMessage(message string, connection net.Conn) {
|
||||
message = fillString(message, BUFFERSIZE)
|
||||
connection.Write([]byte(message))
|
||||
}
|
||||
|
||||
func receiveMessage(connection net.Conn) string {
|
||||
messageByte := make([]byte, BUFFERSIZE)
|
||||
connection.Read(messageByte)
|
||||
return strings.Replace(string(messageByte), ":", "", -1)
|
||||
}
|
||||
|
||||
func fillString(retunString string, toLength int) string {
|
||||
for {
|
||||
lengthString := len(retunString)
|
||||
if lengthString < toLength {
|
||||
retunString = retunString + ":"
|
||||
continue
|
||||
}
|
||||
break
|
||||
}
|
||||
return retunString
|
||||
}
|
||||
|
||||
// chanFromConn creates a channel from a Conn object, and sends everything it
|
||||
// Read()s from the socket to the channel.
|
||||
func chanFromConn(conn net.Conn) chan []byte {
|
||||
c := make(chan []byte)
|
||||
|
||||
go func() {
|
||||
b := make([]byte, BUFFERSIZE)
|
||||
|
||||
for {
|
||||
n, err := conn.Read(b)
|
||||
if n > 0 {
|
||||
res := make([]byte, n)
|
||||
// Copy the buffer so it doesn't get changed while read by the recipient.
|
||||
copy(res, b[:n])
|
||||
c <- res
|
||||
}
|
||||
if err != nil {
|
||||
c <- nil
|
||||
break
|
||||
}
|
||||
}
|
||||
}()
|
||||
|
||||
return c
|
||||
}
|
||||
|
||||
// Pipe creates a full-duplex pipe between the two sockets and transfers data from one to the other.
|
||||
func Pipe(conn1 net.Conn, conn2 net.Conn) {
|
||||
chan1 := chanFromConn(conn1)
|
||||
chan2 := chanFromConn(conn2)
|
||||
|
||||
for {
|
||||
select {
|
||||
case b1 := <-chan1:
|
||||
if b1 == nil {
|
||||
return
|
||||
} else {
|
||||
conn2.Write(b1)
|
||||
}
|
||||
case b2 := <-chan2:
|
||||
if b2 == nil {
|
||||
return
|
||||
} else {
|
||||
conn1.Write(b2)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue