parse buffer from different bases and data unit: (#754)

All flags that expect buffer as input i.e. `--output-file-size-limit`, `--output-file-max-size-limit`, `--copy-buffer-size` and `input-raw-buffer-size` can now parse  inputs from differents bases and data units like: `10mb`, `10kb`, `100gb`,   `18tb`, `11839023`.... 
data units and bases are case insensitive, the parser accepts only the format of [Go integer literals](https://golang.org/ref/spec#Integer_literals)

input_raw.go

@@ -21,7 +21,7 @@ type RAWInput struct {
 	listener      *raw.Listener
 	bpfFilter     string
 	timestampType string
-	bufferSize    int
+	bufferSize    int64
 }
 
 // Available engines for intercepting traffic
@@ -32,7 +32,7 @@ const (
 )
 
 // NewRAWInput constructor for RAWInput. Accepts address with port as argument.
-func NewRAWInput(address string, engine int, trackResponse bool, expire time.Duration, realIPHeader string, bpfFilter string, timestampType string, bufferSize int) (i *RAWInput) {
+func NewRAWInput(address string, engine int, trackResponse bool, expire time.Duration, realIPHeader string, bpfFilter string, timestampType string, bufferSize int64) (i *RAWInput) {
 	i = new(RAWInput)
 	i.data = make(chan *raw.TCPMessage)
 	i.address = address
@@ -105,6 +105,7 @@ func (i *RAWInput) String() string {
 	return "Intercepting traffic from: " + i.address
 }
 
+// Close closes the input raw listener
 func (i *RAWInput) Close() error {
 	i.listener.Close()
 	close(i.quit)

output_file.go

@@ -29,10 +29,11 @@ var dateFileNameFuncs = map[string]func(*FileOutput) string{
 	"%t":  func(o *FileOutput) string { return string(o.payloadType) },
 }
 
+// FileOutputConfig ...
 type FileOutputConfig struct {
 	flushInterval     time.Duration
-	sizeLimit         unitSizeVar
-	outputFileMaxSize unitSizeVar
+	sizeLimit         int64
+	outputFileMaxSize int64
 	queueLimit        int
 	append            bool
 }
@@ -219,7 +220,7 @@ func (o *FileOutput) Write(data []byte) (n int, err error) {
 	o.totalFileSize += int64(len(data) + len(payloadSeparator))
 	o.queueLength++
 
-	if Settings.outputFileConfig.outputFileMaxSize > 0 && o.totalFileSize >= int64(Settings.outputFileConfig.outputFileMaxSize) {
+	if Settings.outputFileConfig.outputFileMaxSize > 0 && o.totalFileSize >= Settings.outputFileConfig.outputFileMaxSize {
 		return len(data), errors.New("File output reached size limit")
 	}
 
@@ -256,6 +257,7 @@ func (o *FileOutput) String() string {
 	return "File output: " + o.file.Name()
 }
 
+// Close closes the output file
 func (o *FileOutput) Close() error {
 	if o.file != nil {
 		if strings.HasSuffix(o.currentName, ".gz") {

output_file_test.go

@@ -158,21 +158,25 @@ func TestFileOutputCompression(t *testing.T) {
 }
 
 func TestParseDataUnit(t *testing.T) {
-	var tests = []struct {
-		value string
-		size  int64
-	}{
-		{"100kb", dataUnitMap['k'] * 100},
-		{"100k", dataUnitMap['k'] * 100},
-		{"1kb", dataUnitMap['k']},
-		{"1g", dataUnitMap['g']},
-		{"10m", dataUnitMap['m'] * 10},
-		{"zsaa312", 0},
+	var d = map[string]int64{
+		"42mb":                 42 << 20,
+		"4_2":                  42,
+		"00":                   0,
+		"\n\n 0.0\r\t\f":       0,
+		"0_600tb":              384 << 40,
+		"0600Tb":               384 << 40,
+		"0o12Mb":               10 << 20,
+		"0b_10010001111_1kb":   2335 << 10,
+		"1024":                 1 << 10,
+		"0b111":                7,
+		"0x12gB":               18 << 30,
+		"0x_67_7a_2f_cc_40_c6": 113774485586118,
+		"121562380192901":      121562380192901,
 	}
-
-	for _, c := range tests {
-		if parseDataUnit(c.value) != c.size {
-			t.Error(c.value, "should be", c.size, "instead", parseDataUnit(c.value))
+	for k, v := range d {
+		n, err := bufferParser(k, "0")
+		if err != nil || n != v {
+			t.Errorf("Error parsing %s: %v", k, err)
 		}
 	}
 }
@@ -321,7 +325,7 @@ func TestFileOutputAppendSizeLimitOverflow(t *testing.T) {
 
 	messageSize := len(message) + len(payloadSeparator)
 
-	output := NewFileOutput(name, &FileOutputConfig{append: false, flushInterval: time.Minute, sizeLimit: unitSizeVar(2 * messageSize)})
+	output := NewFileOutput(name, &FileOutputConfig{append: false, flushInterval: time.Minute, sizeLimit: 2 * int64(messageSize)})
 
 	output.Write([]byte("1 1 1\r\ntest"))
 	name1 := output.file.Name()

output_null.go

@@ -4,7 +4,7 @@ package main
 type NullOutput struct {
 }
 
-// NullOutput constructor for NullOutput
+// NewNullOutput constructor for NullOutput
 func NewNullOutput() (o *NullOutput) {
 	return new(NullOutput)
 }

protocol.go

@@ -7,6 +7,7 @@ import (
 	"strconv"
 )
 
+// These constants help to indicate the type of payload
 const (
 	RequestPayload          = '1'
 	ResponsePayload         = '2'

raw_socket_listener/listener.go

@@ -72,12 +72,12 @@ type Listener struct {
 	trackResponse bool
 	messageExpire time.Duration
 
-	bpfFilter     string
-	timestampType string
+	bpfFilter       string
+	timestampType   string
 	overrideSnapLen bool
-	immediateMode bool
+	immediateMode   bool
 
-	bufferSize int
+	bufferSize int64
 
 	conn        net.PacketConn
 	pcapHandles []*pcap.Handle
@@ -100,7 +100,7 @@ const (
 )
 
 // NewListener creates and initializes new Listener object
-func NewListener(addr string, port string, engine int, trackResponse bool, expire time.Duration, bpfFilter string, timestampType string, bufferSize int, overrideSnapLen bool, immediateMode bool) (l *Listener) {
+func NewListener(addr string, port string, engine int, trackResponse bool, expire time.Duration, bpfFilter string, timestampType string, bufferSize int64, overrideSnapLen bool, immediateMode bool) (l *Listener) {
 	l = &Listener{}
 
 	l.packetsChan = make(chan *packet, 10000)
@@ -367,7 +367,7 @@ func (t *Listener) readPcap() {
 				log.Println("Setting immediate mode")
 			}
 			if t.bufferSize > 0 {
-				inactive.SetBufferSize(t.bufferSize)
+				inactive.SetBufferSize(int(t.bufferSize))
 			}
 
 			handle, herr := inactive.Activate()
@@ -889,11 +889,12 @@ func (t *Listener) IsReady() bool {
 	}
 }
 
-// Receive TCP messages from the listener channel
+// Receiver TCP messages from the listener channel
 func (t *Listener) Receiver() chan *TCPMessage {
 	return t.messagesChan
 }
 
+// Close tcp listener
 func (t *Listener) Close() {
 	close(t.quit)
 	if t.conn != nil {