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slapper.go
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slapper.go
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package main
import (
"bufio"
"bytes"
"crypto/tls"
"encoding/base64"
"errors"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"math"
"net/http"
"net/textproto"
"os"
"strings"
"sync"
"sync/atomic"
"time"
term "github.com/nsf/termbox-go"
terminal "github.com/wayneashleyberry/terminal-dimensions"
)
const (
statsLines = 3
movingWindowsSize = 10 // seconds
screenRefreshFrequency = 10 // per second
screenRefreshInterval = time.Second / screenRefreshFrequency
reservedWidthSpace = 40
reservedHeightSpace = 3
rateIncreaseStep = 100
rateDecreaseStep = -100
)
var (
requestsSent counter
responsesReceived counter
responses [1024]counter
desiredRate counter
timingsOk [][]counter
timingsBad [][]counter
terminalWidth uint
terminalHeight uint
// plotting vars
plotWidth uint
plotHeight uint
// first bucket is for requests faster then minY,
// last of for ones slower then maxY
buckets uint
logBase float64
minY, maxY float64
startMs float64
)
func resetStats() {
requestsSent.Store(0)
responsesReceived.Store(0)
for _, ok := range timingsOk {
for i := 0; i < len(ok); i++ {
ok[i].Store(0)
}
}
for _, bad := range timingsBad {
for i := 0; i < len(bad); i++ {
bad[i].Store(0)
}
}
for i := 0; i < len(responses); i++ {
responses[i].Store(0)
}
}
type counter int64
func (c *counter) Add(v int64) int64 { return atomic.AddInt64((*int64)(c), v) }
func (c *counter) Load() int64 { return atomic.LoadInt64((*int64)(c)) }
func (c *counter) Store(v int64) { atomic.StoreInt64((*int64)(c), v) }
type targeter struct {
idx counter
requests []request
header http.Header
}
type request struct {
method string
url string
body []byte
}
func newTargeter(targets string, base64body bool) (*targeter, error) {
var f *os.File
var err error
if targets == "" {
f = os.Stdin
} else {
f, err = os.Open(targets)
if err != nil {
return nil, err
}
defer f.Close()
}
trgt := &targeter{}
err = trgt.readTargets(f, base64body)
return trgt, err
}
func (trgt *targeter) readTargets(reader io.Reader, base64body bool) error {
// syntax
// GET <url>\n
// $ <body>\n
// \n
var (
method string
url string
body []byte
)
scanner := bufio.NewScanner(reader)
var lastLine string
var line string
for {
if lastLine != "" {
line = lastLine
lastLine = ""
} else {
ok := scanner.Scan()
if !ok {
break
}
line = strings.TrimSpace(scanner.Text())
}
if line == "" {
continue
}
parts := strings.SplitAfterN(line, " ", 2)
method = strings.TrimSpace(parts[0])
url = strings.TrimSpace(parts[1])
ok := scanner.Scan()
line := strings.TrimSpace(scanner.Text())
if !ok {
body = []byte{}
} else if line == "{}" {
body = []byte{}
} else if !strings.HasPrefix(line, "$ ") {
body = []byte{}
lastLine = line
} else {
line = strings.TrimPrefix(line, "$ ")
if base64body {
var err error
body, err = base64.StdEncoding.DecodeString(line)
if err != nil {
return err
}
} else {
body = []byte(line)
}
}
trgt.requests = append(trgt.requests, request{
method: method,
url: url,
body: body,
})
}
return nil
}
func (trgt *targeter) nextRequest() (*http.Request, error) {
if len(trgt.requests) == 0 {
return nil, errors.New("no requests")
}
idx := int(trgt.idx.Add(1))
st := trgt.requests[idx%len(trgt.requests)]
req, err := http.NewRequest(
st.method,
st.url,
bytes.NewReader(st.body),
)
if err != nil {
return req, err
}
for key, headers := range trgt.header {
for _, header := range headers {
if key == "Host" {
req.Host = header
} else {
req.Header.Add(key, header)
}
}
}
return req, err
}
func attack(trgt *targeter, timeout time.Duration, ch <-chan time.Time, quit <-chan struct{}) {
tr := &http.Transport{
DisableKeepAlives: false,
DisableCompression: true,
MaxIdleConnsPerHost: 100,
IdleConnTimeout: 30 * time.Second,
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{
Transport: tr,
Timeout: timeout,
}
for {
select {
case <-ch:
if request, err := trgt.nextRequest(); err == nil {
requestsSent.Add(1)
start := time.Now()
response, err := client.Do(request)
if err == nil {
_, err = ioutil.ReadAll(response.Body)
response.Body.Close()
}
now := time.Now()
elapsed := now.Sub(start)
elapsedMs := float64(elapsed) / float64(time.Millisecond)
correctedElapsedMs := elapsedMs - startMs
elapsedBucket := int(math.Log(correctedElapsedMs) / math.Log(logBase))
// first bucket is for requests faster then minY,
// last of for ones slower then maxY
if elapsedBucket < 0 {
elapsedBucket = 0
} else if elapsedBucket >= int(buckets)-1 {
elapsedBucket = int(buckets) - 1
} else {
elapsedBucket = elapsedBucket + 1
}
responsesReceived.Add(1)
status := 0
if err == nil {
status = response.StatusCode
}
responses[status].Add(1)
tOk, tBad := getTimingsSlot(now)
if status >= 200 && status < 300 {
tOk[elapsedBucket].Add(1)
} else {
tBad[elapsedBucket].Add(1)
}
}
case <-quit:
return
}
}
}
func reporter(quit <-chan struct{}) {
fmt.Print("\033[H")
for i := 0; i < int(terminalHeight); i++ {
fmt.Println(string(bytes.Repeat([]byte(" "), int(terminalWidth)-1)))
}
var currentRate counter
go func() {
var lastSent int64
for range time.Tick(time.Second) {
curr := requestsSent.Load()
currentRate.Store(curr - lastSent)
lastSent = curr
}
}()
colors := []string{
"\033[38;5;46m", "\033[38;5;47m", "\033[38;5;48m", "\033[38;5;49m", // green
"\033[38;5;149m", "\033[38;5;148m", "\033[38;5;179m", "\033[38;5;176m", // yellow
"\033[38;5;169m", "\033[38;5;168m", "\033[38;5;197m", "\033[38;5;196m", // red
}
colorMultiplier := float64(len(colors)) / float64(buckets)
barWidth := int(plotWidth) - reservedWidthSpace // reserve some space on right and left
ticker := time.Tick(screenRefreshInterval)
for {
select {
case <-ticker:
// scratch arrays
tOk := make([]int64, len(timingsOk))
tBad := make([]int64, len(timingsBad))
// need to understand how long in longest bar,
// also take a change to copy arrays to have consistent view
max := int64(1)
for i := 0; i < len(timingsOk); i++ {
ok := timingsOk[i]
bad := timingsBad[i]
for j := 0; j < len(ok); j++ {
tOk[j] += ok[j].Load()
tBad[j] += bad[j].Load()
if sum := tOk[j] + tBad[j]; sum > max {
max = sum
}
}
}
sent := requestsSent.Load()
recv := responsesReceived.Load()
fmt.Print("\033[H") // clean screen
fmt.Printf("sent: %-6d ", sent)
fmt.Printf("in-flight: %-2d ", sent-recv)
fmt.Printf("\033[96mrate: %4d/%d RPS\033[0m ", currentRate.Load(), desiredRate.Load())
fmt.Print("responses: ")
for status, counter := range responses {
if c := counter.Load(); c > 0 {
if status >= 200 && status < 300 {
fmt.Printf("\033[32m[%d]: %-6d\033[0m ", status, c)
} else {
fmt.Printf("\033[31m[%d]: %-6d\033[0m ", status, c)
}
}
}
fmt.Print("\r\n\r\n")
width := float64(barWidth) / float64(max)
for bkt := uint(0); bkt < buckets; bkt++ {
var label string
if bkt == 0 {
if startMs >= 10 {
label = fmt.Sprintf("<%.0f", startMs)
} else {
label = fmt.Sprintf("<%.1f", startMs)
}
} else if bkt == buckets-1 {
if maxY >= 10 {
label = fmt.Sprintf("%3.0f+", maxY)
} else {
label = fmt.Sprintf("%.1f+", maxY)
}
} else {
beginMs := minY + math.Pow(logBase, float64(bkt-1))
endMs := minY + math.Pow(logBase, float64(bkt))
if endMs >= 10 {
label = fmt.Sprintf("%3.0f-%3.0f", beginMs, endMs)
} else {
label = fmt.Sprintf("%.1f-%.1f", beginMs, endMs)
}
}
widthOk := int(float64(tOk[bkt]) * width)
widthBad := int(float64(tBad[bkt]) * width)
widthLeft := barWidth - widthOk - widthBad
fmt.Printf("%10s ms: [%s%6d%s/%s%6d%s] %s%s%s%s%s \r\n",
label,
"\033[32m",
tOk[bkt],
"\033[0m",
"\033[31m",
tBad[bkt],
"\033[0m",
colors[int(float64(bkt)*colorMultiplier)],
bytes.Repeat([]byte("E"), widthBad),
bytes.Repeat([]byte("*"), widthOk),
bytes.Repeat([]byte(" "), widthLeft),
"\033[0m")
}
case <-quit:
return
}
}
}
func keyPressListener(rateChanger chan<- int64) {
// start keyPress listener
err := term.Init()
if err != nil {
log.Fatal(err)
}
defer term.Close()
keyPressListenerLoop:
for {
switch ev := term.PollEvent(); ev.Type {
case term.EventKey:
switch ev.Key {
case term.KeyCtrlC:
break keyPressListenerLoop
default:
switch ev.Ch {
case 'q':
break keyPressListenerLoop
case 'r':
resetStats()
case 'k': // up
rateChanger <- rateIncreaseStep
case 'j':
rateChanger <- rateDecreaseStep
}
}
case term.EventError:
log.Fatal(ev.Err)
}
}
}
func ticker(rate uint64, quit <-chan struct{}) (<-chan time.Time, chan<- int64) {
ticker := make(chan time.Time, 1)
rateChanger := make(chan int64, 1)
// start main workers
go func() {
desiredRate.Store(int64(rate))
tck := time.NewTicker(time.Duration(1e9 / rate))
for {
select {
case r := <-rateChanger:
tck.Stop()
if newRate := desiredRate.Add(r); newRate > 0 {
tck = time.NewTicker(time.Duration(1e9 / newRate))
} else {
desiredRate.Store(0)
}
case t := <-tck.C:
ticker <- t
case <-quit:
return
}
}
}()
return ticker, rateChanger
}
func getTimingsSlot(now time.Time) ([]counter, []counter) {
n := int(now.UnixNano() / 100000000)
slot := n % len(timingsOk)
return timingsOk[slot], timingsBad[slot]
}
func initializeTimingsBucket(buckets uint) {
timingsOk = make([][]counter, movingWindowsSize*screenRefreshFrequency)
for i := 0; i < len(timingsOk); i++ {
timingsOk[i] = make([]counter, buckets)
}
timingsBad = make([][]counter, movingWindowsSize*screenRefreshFrequency)
for i := 0; i < len(timingsBad); i++ {
timingsBad[i] = make([]counter, buckets)
}
go func() {
for now := range time.Tick(screenRefreshInterval) {
// TODO account for missing ticks
// clean next timing slot which is last one in ring buffer
next := now.Add(screenRefreshInterval)
tOk, tBad := getTimingsSlot(next)
for i := 0; i < len(tOk); i++ {
tOk[i].Store(0)
}
for i := 0; i < len(tBad); i++ {
tBad[i].Store(0)
}
}
}()
}
type arrayFlags []string
func (i *arrayFlags) String() string {
return fmt.Sprintf("+%v", *i)
}
func (i *arrayFlags) Set(value string) error {
*i = append(*i, value)
return nil
}
var headerFlags arrayFlags
func main() {
workers := flag.Uint("workers", 8, "Number of workers")
timeout := flag.Duration("timeout", 30*time.Second, "Requests timeout")
targets := flag.String("targets", "", "Targets file")
base64body := flag.Bool("base64body", false, "Bodies in targets file are base64-encoded")
rate := flag.Uint64("rate", 50, "Requests per second")
miY := flag.Duration("minY", 0, "min on Y axe (default 0ms)")
maY := flag.Duration("maxY", 100*time.Millisecond, "max on Y axe")
flag.Var(&headerFlags, "H", "HTTP header 'key: value' set on all requests. Repeat for more than one header.")
flag.Parse()
terminalWidth, _ = terminal.Width()
terminalHeight, _ = terminal.Height()
plotWidth = terminalWidth
plotHeight = terminalHeight - statsLines
if plotWidth <= reservedWidthSpace {
log.Fatal("not enough screen width, min 40 characters required")
}
if plotHeight <= reservedHeightSpace {
log.Fatal("not enough screen height, min 3 lines required")
}
minY, maxY = float64(*miY/time.Millisecond), float64(*maY/time.Millisecond)
deltaY := maxY - minY
buckets = plotHeight
logBase = math.Pow(deltaY, 1/float64(buckets-2))
startMs = minY + math.Pow(logBase, 0)
initializeTimingsBucket(buckets)
quit := make(chan struct{}, 1)
ticker, rateChanger := ticker(*rate, quit)
trgt, err := newTargeter(*targets, *base64body)
if err != nil {
log.Fatal(err)
}
if len(headerFlags) > 0 {
headers := strings.Join(headerFlags, "\r\n")
headers += "\r\n\r\n" // Need an extra \r\n at the end
tp := textproto.NewReader(bufio.NewReader(strings.NewReader(headers))) // Never change, Go
mimeHeader, err := tp.ReadMIMEHeader()
if err != nil {
log.Fatal(err)
}
trgt.header = http.Header(mimeHeader)
}
// start attackers
var wg sync.WaitGroup
for i := uint(0); i < *workers; i++ {
wg.Add(1)
go func() {
defer wg.Done()
attack(trgt, *timeout, ticker, quit)
}()
}
// start reporter
wg.Add(1)
go func() {
defer wg.Done()
reporter(quit)
}()
keyPressListener(rateChanger)
// bye
close(quit)
wg.Wait()
}