Quick script to generate badchars array during exploit development

gen_badchars.py

#!/usr/bin/env python3

import sys

sys.stdout.write("badchars = (\n\tb\"")

pos = 0
for x in range(0,256):
    sys.stdout.write( "\\x" + '{0:02x}'.format(x))
    if pos == 15:
        pos = 0
        if x < 255:
            sys.stdout.write("\"\n\tb\"")
    else:
        pos += 1
sys.stdout.write("\")\n")

That first line should probably be:

#!/usr/bin/env python3

Both /bin and /usr/bin will work on most 'nix environments. I've updated to /usr/bin so there isn't confusion for those that don't know both are valid.