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main.go
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main.go
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package main
import (
"context"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/binary"
"encoding/hex"
"fmt"
"io"
"os"
"runtime"
"strconv"
"time"
"github.com/safing/portbase/log"
"github.com/safing/portbase/modules"
"github.com/safing/portbase/rng"
"github.com/safing/portbase/run"
)
var (
module *modules.Module
outputFile *os.File
outputSize uint64 = 1000000
)
func init() {
module = modules.Register("main", prep, start, nil, "rng")
}
func main() {
runtime.GOMAXPROCS(1)
os.Exit(run.Run())
}
func prep() error {
if len(os.Args) < 3 {
fmt.Printf("usage: ./%s {fortuna|tickfeeder} <file> [output size in MB]", os.Args[0])
return modules.ErrCleanExit
}
switch os.Args[1] {
case "fortuna":
case "tickfeeder":
default:
return fmt.Errorf("usage: %s {fortuna|tickfeeder}", os.Args[0])
}
if len(os.Args) > 3 {
n, err := strconv.ParseUint(os.Args[3], 10, 64)
if err != nil {
return fmt.Errorf("failed to parse output size: %w", err)
}
outputSize = n * 1000000
}
var err error
outputFile, err = os.OpenFile(os.Args[2], os.O_CREATE|os.O_WRONLY, 0o0644) //nolint:gosec
if err != nil {
return fmt.Errorf("failed to open output file: %w", err)
}
return nil
}
//nolint:gocognit
func start() error {
// generates 1MB and writes to stdout
log.Infof("writing %dMB to stdout, a \".\" will be printed at every 1024 bytes.", outputSize/1000000)
switch os.Args[1] {
case "fortuna":
module.StartWorker("fortuna", fortuna)
case "tickfeeder":
module.StartWorker("noise", noise)
module.StartWorker("tickfeeder", tickfeeder)
default:
return fmt.Errorf("usage: ./%s {fortuna|tickfeeder}", os.Args[0])
}
return nil
}
func fortuna(_ context.Context) error {
var bytesWritten uint64
for {
if module.IsStopping() {
return nil
}
b, err := rng.Bytes(64)
if err != nil {
return err
}
_, err = outputFile.Write(b)
if err != nil {
return err
}
bytesWritten += 64
if bytesWritten%1024 == 0 {
_, _ = os.Stderr.WriteString(".")
}
if bytesWritten%65536 == 0 {
fmt.Fprintf(os.Stderr, "\n%d bytes written\n", bytesWritten)
}
if bytesWritten >= outputSize {
_, _ = os.Stderr.WriteString("\n")
break
}
}
go modules.Shutdown() //nolint:errcheck
return nil
}
func tickfeeder(ctx context.Context) error {
var bytesWritten uint64
var value int64
var pushes int
for {
if module.IsStopping() {
return nil
}
time.Sleep(10 * time.Nanosecond)
value = (value << 1) | (time.Now().UnixNano() % 2)
pushes++
if pushes >= 64 {
b := make([]byte, 8)
binary.LittleEndian.PutUint64(b, uint64(value))
_, err := outputFile.Write(b)
if err != nil {
return err
}
bytesWritten += 8
if bytesWritten%1024 == 0 {
_, _ = os.Stderr.WriteString(".")
}
if bytesWritten%65536 == 0 {
fmt.Fprintf(os.Stderr, "\n%d bytes written\n", bytesWritten)
}
pushes = 0
}
if bytesWritten >= outputSize {
_, _ = os.Stderr.WriteString("\n")
break
}
}
go modules.Shutdown() //nolint:errcheck
return nil
}
func noise(ctx context.Context) error {
// do some aes ctr for noise
key, _ := hex.DecodeString("6368616e676520746869732070617373")
data := []byte("some plaintext x")
block, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
iv := make([]byte, aes.BlockSize)
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
panic(err)
}
stream := cipher.NewCTR(block, iv)
for {
select {
case <-ctx.Done():
return nil
default:
stream.XORKeyStream(data, data)
}
}
}