Merge pull request #1 from schollz/master

sync up

README.md

@@ -10,7 +10,7 @@
 
 <p align="center">Secure transfer of stuff from one side of the internet to the other.</p>
 
-This is more or less (but mostly *less*) a Golang port of [@warner's](https://github.com/warner) [*magic-wormhole*](https://github.com/warner/magic-wormhole) which allows you to directly transfer files between computers. I wrote this because I wanted to send my friend Jessie a file using *magic-wormhole*. However, Jessie doesn't like the idea of putting Python on her computer because it is a giant snake. So, nominally, this is a version of *magic-wormhole* without the dependencies that you can just double-click on your computer, even if you use Windows.
+This is more or less (but mostly *less*) a Golang port of [@warner's](https://github.com/warner) [*magic-wormhole*](https://github.com/warner/magic-wormhole) which allows you to directly transfer files between computers. I wrote this because I wanted to send my friend Jessie a file using *magic-wormhole*. However, when I told Jessie how to install the dependencies for *magic-wormhole* she made this face: :sob:. So, nominally, *croc* does the same thing (file transfer directly between computers) without dependencies so you can just double-click on your computer, even if you use Windows.
 
 **Don't we have enough open-source peer-to-peer file-transfer utilities?**
 
@@ -18,6 +18,12 @@ This is more or less (but mostly *less*) a Golang port of [@warner's](https://gi
 
 # Example
 
+_These two gifs should run in sync if you force-reload (Ctl+F5)_
+
+![send](https://user-images.githubusercontent.com/6550035/31855780-35140b88-b66f-11e7-86cb-c23e2cb4fa86.gif)
+![receive](https://user-images.githubusercontent.com/6550035/31855781-3632b384-b66f-11e7-8b29-9ba61ec374d4.gif)
+
+
 **Sender:**
 
 ```
@@ -61,7 +67,7 @@ Or, if you are like my good friend Jessie and "*just can't even*" with programmi
 
 ## Run your own relay
 
-*croc* relies on a TCP relay to staple the parallel incoming and outgoing connections. The relay temporarily stores connection information and the encrypted meta information. The default uses my server, `cowyo.com`, which has no guarantees except that I guarantee to turn if off as soon as it gets abused. 
+*croc* relies on a TCP relay to staple the parallel incoming and outgoing connections. The relay temporarily stores connection information and the encrypted meta information. The default uses a public relay at, `cowyo.com`, which has no guarantees except that I guarantee to turn if off as soon as it gets abused ([click here to check the current status of the public relay](https://stats.uptimerobot.com/lOwJYIgRm)). 
 
 I recommend you run your own relay, it is very easy. On your server, `your-server.com`, just run
 

connect.go

@@ -221,7 +221,7 @@ func (c *Connection) runClient() error {
 			connection, err := net.Dial("tcp", c.Server+":"+port)
 			if err != nil {
 				if c.Server == "cowyo.com" {
-					fmt.Println("\nThe public server is down. Please tweet the webmaster: @yakczar")
+					fmt.Println("\nCheck http://bit.ly/croc-relay to see if the public server is down or contact the webmaster: @yakczar")
 				} else {
 					fmt.Printf("\nCould not connect to relay %s\n", c.Server)
 				}
@@ -332,7 +332,9 @@ func (c *Connection) runClient() error {
 						if id == 0 {
 							fmt.Printf("\n\nReceiving (<-%s)..\n", sendersAddress)
 						}
-						c.receiveFile(id, connection)
+						if err := c.receiveFile(id, connection); err != nil {
+							log.Error(errors.Wrap(err, "Problem receiving the file: "))
+						}
 					}
 				}
 			}
@@ -426,8 +428,13 @@ func (c *Connection) receiveFile(id int, connection net.Conn) error {
 	fileSizeInt, _ := strconv.Atoi(fileDataString)
 	chunkSize := int64(fileSizeInt)
 	logger.Debugf("chunk size: %d", chunkSize)
+	if chunkSize == 0 {
+		logger.Debug(fileSizeBuffer)
+		return errors.New("chunk size is empty!")
+	}
 
 	os.Remove(c.File.Name + ".enc." + strconv.Itoa(id))
+	log.Debug("Making " + c.File.Name + ".enc." + strconv.Itoa(id))
 	newFile, err := os.Create(c.File.Name + ".enc." + strconv.Itoa(id))
 	if err != nil {
 		panic(err)
@@ -486,7 +493,10 @@ func (c *Connection) sendFile(id int, connection net.Conn) error {
 		return err
 	}
 	logger.Debugf("sending chunk size: %d", fi.Size())
-	connection.Write([]byte(fillString(strconv.FormatInt(int64(fi.Size()), 10), 10)))
+	_, err = connection.Write([]byte(fillString(strconv.FormatInt(int64(fi.Size()), 10), 10)))
+	if err != nil {
+		return errors.Wrap(err, "Problem sending chunk data: ")
+	}
 
 	// show the progress
 	if !c.Debug {

relay.go

@@ -114,22 +114,27 @@ func (r *Relay) listener(id int) (err error) {
 }
 
 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,
+		"ip": connection.RemoteAddr().String(),
 	})
 
+	sendMessage("who?", connection)
+	m := strings.Split(receiveMessage(connection), ".")
+	if len(m) < 3 {
+		logger.Debug("exiting, not enough information")
+		sendMessage("not enough information", connection)
+		return
+	}
+	connectionType, codePhrase, metaData := m[0], m[1], m[2]
+	key := codePhrase + "-" + strconv.Itoa(id)
+
 	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
@@ -164,13 +169,18 @@ func (r *Relay) clientCommuncation(id int, connection net.Conn) {
 		Pipe(con1, con2)
 		logger.Debug("done piping")
 		r.connections.Lock()
+		// close connections
+		r.connections.sender[key].Close()
+		r.connections.receiver[key].Close()
+		// delete connctions
 		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"
+	} else if connectionType == "r" || connectionType == "c" {
+		//receiver
 		if r.connections.IsPotentialReceiverConnected(key) {
 			sendMessage("no", connection)
 			return
@@ -212,6 +222,8 @@ func (r *Relay) clientCommuncation(id int, connection net.Conn) {
 			r.connections.receiver[key] = connection
 			r.connections.Unlock()
 		}
+	} else {
+		logger.Debugf("Got unknown protocol: '%s'", connectionType)
 	}
 	return
 }
@@ -222,8 +234,20 @@ func sendMessage(message string, connection net.Conn) {
 }
 
 func receiveMessage(connection net.Conn) string {
+	logger := log.WithFields(log.Fields{
+		"func": "receiveMessage",
+		"ip":   connection.RemoteAddr().String(),
+	})
 	messageByte := make([]byte, BUFFERSIZE)
-	connection.Read(messageByte)
+	err := connection.SetDeadline(time.Now().Add(60 * time.Minute))
+	if err != nil {
+		logger.Warn(err)
+	}
+	_, err = connection.Read(messageByte)
+	if err != nil {
+		logger.Warn("read deadline, no response")
+		return ""
+	}
 	return strings.Replace(string(messageByte), ":", "", -1)
 }
 

utils.go

@@ -7,23 +7,25 @@ import (
 	"math"
 	"os"
 	"strconv"
+
+	"github.com/pkg/errors"
 )
 
 func CatFiles(files []string, outfile string, remove ...bool) error {
 	finished, err := os.Create(outfile)
 	defer finished.Close()
 	if err != nil {
-		return err
+		return errors.Wrap(err, "CatFiles create: ")
 	}
 	for i := range files {
 		fh, err := os.Open(files[i])
 		if err != nil {
-			return err
+			return errors.Wrap(err, "CatFiles open "+files[i]+": ")
 		}
 
 		_, err = io.Copy(finished, fh)
 		if err != nil {
-			return err
+			return errors.Wrap(err, "CatFiles copy: ")
 		}
 		fh.Close()
 		if len(remove) > 0 && remove[0] {