1
2
3
4
56
7
8
9
1011
12
13
14
1516
17
18
19
2021
22
23
24
2526
27
28
29
3031
32
33
34
3536
37
38
39
4041
42
43
44
4546
47
48
49
5051
52
53
54
5556
57
58
59
60

#!/usr/bin/python
import sys
import os
import os.path
 SOLUTION = "/home/level/12/solution.txt"
 
 
# Your main objective is to return True
def main(filepath):        # We want to prevent some noobish solutions
        if any(ipattern in filepath for ipattern in ('proc', 'uptime', 'tmp', 'random', 'full', 'zero', 'null')):
                raise ValueError('nononono: hacking is not allowed')
 
        # You have to give me an valid file!        if not os.path.exists(filepath):
                raise ValueError('sorry file "%s" does not exists' % filepath)
 
        # We are opening the file here and store the content in 'jjk'
        print('opening %s' % filepath)        with open(filepath) as gizmore:
                jjk = gizmore.read()
        print('closed')
 
        # The file was closed, does it still exists?        if not os.path.exists(filepath):
                # The file does not exists anymore, you have found a solution
                print('You are l33t')
                return True
        else:                # Ok, we will reopen the file and store its content in 'kwisatz'
                with open(filepath) as spaceone:
                        kwisatz = spaceone.read()
 
                # Does the content differs from old content?                if jjk != kwisatz:
                        # content differs so return True
                        print('You are a winner')
                        return True
         raise ValueError('fail...')
 
 
if __name__ == "__main__":
        if len(sys.argv) < 2:                print('wrong argcount')
                sys.exit(1)
 
        try:
                # Objective: return True here!                success = main(sys.argv[1])
        except (ValueError, OSError, IOError) as exc:
                print('%s' % (exc,))
                sys.exit(3)
        else:                #os.setuid(os.geteuid())
                os.setgid(os.getegid())
                with open(SOLUTION) as fd:
                        print(fd.read())