Example #1
0
// Helper function for handleRequest - handles the case where we are received meta.info file.
// @param net.Conn conn - The socket which the client is asking on
// @param string request - The request sent to tracker
// @return error - An error can be produced when trying to send a file or if there is incorrect
// syntax in the request - otherwise error will be nil.
func handlePush(request string, conn net.Conn) error {
	// Client syntax for push is "Meta_Push:<LynkName>\n"
	// So tmpArr[0] - Meta_Push | tmpArr[1] - <LynkName>
	tmpArr := strings.Split(request, ":")
	if len(tmpArr) != 2 {
		conn.Close()
		return errors.New("Invalid Request Syntax")
	}

	if client.IsDownloading(tmpArr[1]) {
		client.StopDownload(tmpArr[1])
	}

	metaPath := lynxutil.HomePath + tmpArr[1] + "/"
	err := os.Remove(metaPath)
	if err != nil {
		fmt.Println(err)
		return err
	}

	newMetainfo, err := os.Create(metaPath)
	if err != nil {
		fmt.Println(err)
		return err
	}

	bufIn, err := ioutil.ReadAll(conn)

	// Decrypt
	//key := []byte("abcdefghijklmnopqrstuvwxyz123456")
	key := []byte(lynxutil.PrivateKey)
	var plainFile []byte
	if plainFile, err = mycrypt.Decrypt(key, bufIn); err != nil {
		log.Fatal(err)
	}

	// Decompress
	r, _ := gzip.NewReader(bytes.NewBuffer(plainFile))
	bufOut, _ := ioutil.ReadAll(r)
	r.Read(bufOut)
	r.Close()

	fmt.Println(len(bufIn), "Bytes Received")
	newMetainfo.Write(bufOut)

	return nil // No errors if we reached this point
}
Example #2
0
// The function responsible for actually asking for a file from a peer
// @param string lynkName - The name of the lynk we're asking about
// @param string fileName - The name of the file to find in the peers
// @param net.Conn conn - The connection to the peer
// @return bool - True or false is returned based on whether or not we successfully received a file
func askForFile(lynkName, fileName string, conn net.Conn) bool {
	fmt.Fprintf(conn, "Do_You_Have_FileName:"+lynkName+"/"+fileName+"\n")

	reply, err := bufio.NewReader(conn).ReadString('\n') // Waits for a String ending in newline
	reply = strings.TrimSpace(reply)
	gotFile := false

	// Has file and no errors
	if reply != "NO" && err == nil {
		file, err := os.Create(lynxutil.HomePath + lynkName + "/" + fileName)
		if err != nil {
			return gotFile
		}
		defer file.Close()

		bufIn, err := ioutil.ReadAll(conn)
		if err != nil {
			return gotFile
		}

		// Decrypt
		//key := []byte("abcdefghijklmnopqrstuvwxyz123456")
		key := []byte(lynxutil.PrivateKey)
		var plainFile []byte
		if plainFile, err = mycrypt.Decrypt(key, bufIn); err != nil {
			log.Fatal(err)
		}

		// Decompress
		r, _ := gzip.NewReader(bytes.NewBuffer(plainFile))
		bufOut, _ := ioutil.ReadAll(r)
		r.Read(bufOut)
		r.Close()

		fmt.Println(len(bufIn), "Bytes Received")
		file.Write(bufOut)
		gotFile = true
	}

	return gotFile
}
Example #3
0
// Unit tests for listen, handle, and send functions as well as push meta
// @param *testing.T t - The wrapper for the test
func TestListenHandleSend(t *testing.T) {
	fmt.Println("\n----------------TestListen----------------")

	conn, err := net.Dial("tcp", "127.0.0.1:8080")

	if err != nil {
		t.Error(err.Error())
	} else {
		fmt.Println("Successfully Connected To Server")
		successful++
	}

	fmt.Println("\n----------------TestHandleRequest----------------")

	fmt.Fprintf(conn, "Do_You_Have_FileName:Tests/fake.txt\n")

	reply, err := bufio.NewReader(conn).ReadString('\n') // Waits for a String ending in newline
	reply = strings.TrimSpace(reply)

	if reply == "NO" {
		fmt.Println("Successfully Handled Invalid Request")
		successful++
	} else {
		t.Error("Test failed, expected to have server respond 'NO'. Got", reply)
	}
	conn.Close()

	conn, err = net.Dial("tcp", "127.0.0.1:8080")

	fmt.Fprintf(conn, "Do_You_Have_FileName:Tests/test.txt\n")

	reply, err = bufio.NewReader(conn).ReadString('\n') // Waits for a String ending in newline
	reply = strings.TrimSpace(reply)

	if reply == "YES" {
		fmt.Println("Successfully Handled Valid Request")
		successful++
	} else {
		t.Error("Test failed, expected to have server respond 'YES'. Got", reply)
	}

	fmt.Println("\n----------------TestSendFile----------------")

	file, err := os.Create("test.txt_ServerTest")
	if err != nil {
		t.Error(err.Error())
	}
	defer file.Close()

	bufIn := make([]byte, 512) // Set to 512 because we know this file is small
	_, err = conn.Read(bufIn)
	// Decrypt
	//key := []byte("abcdefghijklmnopqrstuvwxyz123456")
	key := []byte(lynxutil.PrivateKey)
	var plainFile []byte
	if plainFile, err = mycrypt.Decrypt(key, bufIn); err != nil {
		log.Fatal(err)
	}
	// Decompress
	r, err := gzip.NewReader(bytes.NewBuffer(plainFile))
	bufOut := make([]byte, 512) // Set to 512 because we know this file is small
	r.Read(bufOut)
	file.Write(bufOut)
	r.Close()

	if err != nil {
		t.Error(err.Error())
	} else {
		fmt.Println("Successfully Sent 'text.txt'")
		successful++
	}

	content, _ := ioutil.ReadFile("test.txt_ServerTest")
	s := string(content)

	if !strings.Contains(s, "test contents") {
		t.Error("File contents invalid. Got '" + s + "'")
	} else {
		fmt.Println("File contents valid.")
		successful++
	}

	fmt.Println("\n----------------TestPushMeta----------------")

	if err != nil {
		t.Error(err.Error())
	} else {
		fmt.Println("Successfully Pushed Meta")
		successful++
	}

	fmt.Println("\nSuccess on ", successful, "/", total, " tests.")
}