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zudp2hs.go
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zudp2hs.go
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package main
import (
"os"
"path"
"bufio"
"regexp"
"strconv"
"io/ioutil"
"encoding/json"
"encoding/binary"
)
var entries []entry
type entry struct {
Ports []int
Data string
}
// Reads the specified files in the directory and sends the entries for processing.
func parseInput(dir string) error {
var err error
var fp *os.File
var ls []os.FileInfo
if ls, err = ioutil.ReadDir(dir); err != nil {
return err
}
repn, _ := regexp.Compile(`_(\d+)(?:\.pkt|_)`) // match port number
for _, f := range ls {
if f.IsDir() || path.Ext(f.Name()) != ".pkt" {
continue
}
entry := entry { }
if mc := repn.FindAllStringSubmatch(f.Name(), -1); len(mc) > 0 {
if i, e := strconv.Atoi(mc[0][1]); e == nil {
entry.Ports = append(entry.Ports, i)
}
} else {
continue
}
if fp, err = os.Open(path.Join(dir, f.Name())); err != nil {
continue
}
txt, _ := ioutil.ReadAll(fp)
dat := string(txt)
fp.Close()
entry.Data = dat
entries = append(entries, entry)
}
return err
}
// Writes the globally loaded entries to the specified file.
func serializeEntries(file string, debug bool) error {
var err error
var fp *os.File
if fp, err = os.Create(file); err != nil {
return err
}
defer fp.Close()
bw := bufio.NewWriter(fp)
if debug {
var bs []byte
bs, err = json.MarshalIndent(entries, "", "\t")
bw.Write(bs)
bw.Flush()
return err
}
// package type: UDP payloads
binary.Write(bw, binary.LittleEndian, uint16(10))
// package version
binary.Write(bw, binary.LittleEndian, uint16(1))
// number of entries
binary.Write(bw, binary.LittleEndian, uint32(len(entries)))
for _, entry := range entries {
// payload data
binary.Write(bw, binary.LittleEndian, uint16(len(entry.Data)))
bw.WriteString(entry.Data)
// number of ports in entry
binary.Write(bw, binary.LittleEndian, uint16(len(entry.Ports)))
for _, port := range entry.Ports {
binary.Write(bw, binary.LittleEndian, uint16(port))
}
}
binary.Write(bw, binary.LittleEndian, uint32(0))
bw.Flush()
return err
}
// Entry point of the application.
func main() {
if len(os.Args) < 3 {
println("usage: zudp2hs [--json] input output")
os.Exit(-1)
}
var err error
var dbg bool
if os.Args[1] == "--json" {
dbg = true
os.Args = os.Args[1:]
}
println("Parsing zmap payloads database...")
if err = parseInput(os.Args[1]); err != nil {
println(err)
os.Exit(-1)
}
println("Writing parsed data...")
if err = serializeEntries(os.Args[2], dbg); err != nil {
println(err)
os.Exit(-1)
}
}