[tor-commits] [ooni-probe/master] Fix random mutation function to not be unfair towards unlucky people

[art@xxxxxxxxxxxxxx]

commit 0adc1ba818124325d03961e53c1c6bedd3e90413
Author: Arturo Filastò <art@xxxxxxxxxxxxxx>
Date:   Sat Jun 16 16:38:49 2012 +0200

    Fix random mutation function to not be unfair towards unlucky people
---
 ooni/plugins/chinatrigger.py |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/ooni/plugins/chinatrigger.py b/ooni/plugins/chinatrigger.py
index caa6a05..8a2418a 100644
--- a/ooni/plugins/chinatrigger.py
+++ b/ooni/plugins/chinatrigger.py
@@ -74,7 +74,10 @@ class ChinaTriggerTest(ScapyTest):
         Slightly changed mutate function.
         """
         ret = pkt[:idx-1]
-        ret += chr(random.randint(0, 256))
+        mutation = chr(random.randint(0, 256))
+        while mutation == pkt[idx]:
+            mutation = chr(random.randint(0, 256))
+        ret += mutation
         ret += pkt[idx:]
         return ret
 

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