This commit is contained in:
Norwin Roosen 2019-01-11 17:31:14 +01:00
parent 33ba2d8eea
commit cbc5261bbc
1 changed files with 57 additions and 66 deletions

123
main.go
View File

@ -18,9 +18,7 @@ import (
var err error var err error
var cpuprofile = flag.String("cpuprofile", "", "Destination file for CPU Profile") var cpuprofile = flag.String("cpuprofile", "", "Destination file for CPU Profile")
var image = flag.String("image", "", "Absolute Path to image") var image_path = 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_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 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 connections = flag.Int("connections", 10, "Number of simultaneous connections/threads. Each Thread posts a subimage")
@ -29,8 +27,8 @@ var runtime = flag.String("runtime", "1", "Runtime in Minutes")
func main() { func main() {
flag.Parse() flag.Parse()
if *image == "" || *address == "" { if *image_path == "" {
log.Fatal("No image or no server address provided") log.Fatal("No image provided")
} }
// check connectivity by opening one test connection // check connectivity by opening one test connection
@ -49,10 +47,12 @@ func main() {
pprof.StartCPUProfile(f) pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile() defer pprof.StopCPUProfile()
} }
// Generate and split messages into equal chunks // Generate and split messages into equal chunks
msg := splitmessages(genMessages()) commands := genCommands(readImage(*image_path), *image_offsetx, *image_offsety)
for _, message := range msg { commandGroups := chunkCommands(commands, *connections)
go bomb(message) for _, messages := range commandGroups {
go bomb(messages)
} }
// Terminate after 1 Minute to save resources // Terminate after 1 Minute to save resources
@ -63,87 +63,78 @@ func main() {
time.Sleep(time.Minute * timer) time.Sleep(time.Minute * timer)
} }
func bomb(messages []byte) { func bomb(messages [][]byte) {
conn, err := net.Dial("tcp", *address) conn, err := net.Dial("tcp", *address)
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
defer conn.Close() defer conn.Close()
// Start bombardement // Start bombardement
for { for {
_, err := conn.Write(messages) for _, message := range messages {
if err != nil { _, err := conn.Write(message)
log.Fatal(err) if err != nil {
log.Fatal(err)
}
} }
} }
} }
// Creates message based on given image func readImage(path string) (img image.Image) {
func genMessages() (output []byte) { reader, err := os.Open(path)
reader, err := os.Open(*image)
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
img, err2 := png.Decode(reader) img, _, err2 := image.Decode(reader)
if err2 != nil { if err2 != nil {
log.Fatal(err2) log.Fatal(err2)
} }
for x := img.Bounds().Max.X; x != 0; x-- { return img
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 intToHex(x uint32) string {
func splitmessages(in []byte) [][]byte { str := strconv.FormatInt(int64(x), 16)
index := 0 if len(str) == 1 {
equalsplit := len(in) / *connections str = "0" + str
output := make([][]byte, *connections) }
for i := 0; i < *connections; i++ { return str[0:2]
if index+equalsplit > len(in) { }
output[i] = in[index:]
// Creates message based on given image
func genCommands(img image.Image, offset_x, offset_y int) (commands [][]byte) {
max_x := img.Bounds().Max.X
max_y := img.Bounds().Max.Y
commands = make([][]byte, max_x*max_y)
for x := 0; x < max_x; x++ {
for y := 0; y < max_y; y++ {
r, g, b, _ := img.At(x, y).RGBA()
colStr := intToHex(r) + intToHex(g) + intToHex(b)
cmd := fmt.Sprintf("PX %d %d %s\n", x+offset_x, y+offset_y, colStr)
commands[x*max_y+y] = []byte(cmd)
}
}
return commands
}
// Splits messages into equally sized chunks
func chunkCommands(commands [][]byte, numChunks int) [][][]byte {
chunks := make([][][]byte, numChunks)
chunkLength := len(commands) / numChunks
for i := 0; i < numChunks; i++ {
cmdOffset := i * chunkLength
if cmdOffset+chunkLength > len(commands) {
chunks[i] = commands[cmdOffset:]
break break
} }
chunks[i] = commands[cmdOffset : cmdOffset+chunkLength]
tmp := index
for in[index+equalsplit] != 80 {
index++
}
output[i] = in[tmp : index+equalsplit]
index += equalsplit
} }
return output return chunks
} }