Hochwasser/main.go

142 lines
3.3 KiB
Go

package main
import (
"flag"
"net"
"runtime/pprof"
"time"
)
import "fmt"
import "image/png"
import "log"
import "os"
import "strconv"
import _ "net/http/pprof"
var err error
var cpuprofile = flag.String("cpuprofile", "", "Destination file for CPU Profile")
var image = flag.String("image", "", "Absolute Path to image")
var canvas_xsize = flag.Int("xsize", 800, "Width of the canvas in px")
var canvas_ysize = flag.Int("ysize", 600, "Height of the canvas in px")
var image_offsetx = flag.Int("xoffset", 0, "Offset of posted image from left border")
var image_offsety = flag.Int("yoffset", 0, "Offset of posted image from top border")
var connections = flag.Int("connections", 10, "Number of simultaneous connections/threads. Each Thread posts a subimage")
var address = flag.String("host", "127.0.0.1:1337", "Server address")
var runtime = flag.String("runtime", "1", "Runtime in Minutes")
func main() {
flag.Parse()
if *image == "" || *address == "" {
log.Fatal("No image or no server address provided")
}
// Start cpu profiling if wanted
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal(err)
}
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
// Generate and split messages into equal chunks
msg := splitmessages(genMessages())
for _, message := range msg {
go bomb(message)
}
// Terminate after 1 Minute to save resources
timer, err := time.ParseDuration(*runtime + "m")
if err != nil {
log.Fatal("Invalid runtime specified: " + err.Error())
}
time.Sleep(time.Minute * timer)
}
func bomb(messages []byte) {
conn, err := net.Dial("tcp", *address)
if err != nil {
log.Print("error establishing tcp connection: " + err.Error())
}
//TODO: Actually close the connection and not just terminate main thread
defer conn.Close()
// Start bombardement
for {
_, err := conn.Write(messages)
if err != nil {
log.Println(err.Error())
}
}
}
// Creates message based on given image
func genMessages() (output []byte) {
reader, err := os.Open(*image)
if err != nil {
log.Fatal(err)
}
img, err2 := png.Decode(reader)
if err2 != nil {
log.Fatal(err2)
}
for x := img.Bounds().Max.X; x != 0; x-- {
for y := img.Bounds().Max.Y; y != 0; y-- {
col := img.At(x, y)
r, g, b, _ := col.RGBA()
rStr := strconv.FormatInt(int64(r), 16)
if len(rStr) == 1 {
rStr = "0" + rStr
}
gStr := strconv.FormatInt(int64(g), 16)
if len(gStr) == 1 {
gStr = "0" + gStr
}
bStr := strconv.FormatInt(int64(b), 16)
if len(bStr) == 1 {
bStr = "0" + bStr
}
colStr := rStr[0:2]
colStr += gStr[0:2]
colStr += bStr[0:2]
//Do not draw transparent pixels
if colStr == "000000" {
continue
}
pxStr := fmt.Sprintf("PX %d %d %s\n", x+*image_offsetx, y+*image_offsety, colStr)
output = append(output, []byte(pxStr)...)
}
}
return output
}
// Splits messages into chunks, splitting on complete commands only
func splitmessages(in []byte) [][]byte {
index := 0
equalsplit := len(in) / *connections
output := make([][]byte, *connections)
for i := 0; i < *connections; i++ {
if index+equalsplit > len(in) {
output[i] = in[index:]
break
}
tmp := index
for in[index+equalsplit] != 80 {
index++
}
output[i] = in[tmp : index+equalsplit]
index += equalsplit
}
return output
}