From a93638ce029697eb731d99d0f2b0be9413515e85 Mon Sep 17 00:00:00 2001
From: SGills <5122866+sg3-141-592@users.noreply.github.com>
Date: Tue, 21 Feb 2023 14:27:05 +0000
Subject: [PATCH] Improving urllib3 utils coverage (#9631)

This is an improvement to the urllib3 utils functions fuzzing. This is
my first attempt at contributing to oss-fuzz so feedback appreciated on
whether this custom mutator approach is ok.

- `parse_url` function
We now have a custom mutator that drives more url like structures. I
originally developed this using Hypothesis, but the quality of fuzzing
wasn't good (seems to be a known issue
https://github.com/google/atheris/issues/20). Because of this I've used
a 3rd party library `exrex` that can generate test data from regular
expressions.
---
 projects/urllib3/fuzz_urlparse.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/projects/urllib3/fuzz_urlparse.py b/projects/urllib3/fuzz_urlparse.py
index 81c016453..ef7631bef 100644
--- a/projects/urllib3/fuzz_urlparse.py
+++ b/projects/urllib3/fuzz_urlparse.py
@@ -23,7 +23,12 @@ def TestOneInput(data):
     original = fdp.ConsumeUnicode(sys.maxsize)
 
     try:
-        urllib3.util.parse_url(original)
+        response = urllib3.util.parse_url(original)
+        response.hostname
+        response.request_uri
+        response.authority
+        response.netloc
+        response.url
     except urllib3.exceptions.LocationParseError:
         None
     return