CODEWITHSUNDEEP
pythonposturllibpython-3.3
Vecht
Vecht

Reputation: 13

Simple POST using urllib with Python 3.3

I'm participating in a hash-breaking contest and I'm trying to automate posting strings to an html form and getting the hash score back. So far I've managed to get SOMETHING posted to the url, but its not the exact string I'm expecting, and thus the value returned for the hash is way off from the one obtained by just typing in the string manually.

import urllib.parse, urllib.request

url = "http://almamater.xkcd.com/?edu=una.edu"
data = "test".encode("ascii")
header = {"Content-Type":"application/octet-stream"}
req = urllib.request.Request(url, data, header)
f = urllib.request.urlopen(req)
print(f.read())
#parse f to pull out hash

I obtain the following hash from the site:

0fff9563bb3279289227ac77d319b6fff8d7e9f09da1247b72a0a265cd6d2a62645ad547ed8193db48cff847c06494a03f55666d3b47eb4c20456c9373c86297d630d5578ebd34cb40991578f9f52b18003efa35d3da6553ff35db91b81ab890bec1b189b7f52cb2a783ebb7d823d725b0b4a71f6824e88f68f982eefc6d19c6

This differs considerably from what I expected, which is what you get if you type in "test" (no quotes) into the form:

e21091dbb0d61bc93db4d1f278a04fe1a51165fb7262c7da31f886ae09ff3e04c41483c500db2792c59742958d8f7f39fe4f4f2cdc7940b7b25e3289b89d344e06f76305b9de525933b5df5dae2a37388f82cf76374fe363587acfb49b9d2c8fc131ef4a32c762be083b07330989b298d60e312f56a6b8a4c0f53c9b59864fb7

Obviously the code isn't doing what I'm expecting it to do. Any tips?

Upvotes: 1

Views: 4453

Answers (1)

FatalError
FatalError

Reputation: 54541

When you submit your form data, it also includes the field name, so when you submit "test" the data submitted actually looks like "hashable=test". Try changing your data like this:

data = "hashable=test".encode("ascii")

or alternatively:

data = urllib.parse.urlencode({'hashable': 'test'})

Upvotes: 1

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