From 6875c01cf2119ed06e1758a072ad656cffcd4f52 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20De=20Keersmaeker?=
<francois.dekeersmaeker@uclouvain.be>
Date: Fri, 12 May 2023 11:27:49 +0200
Subject: [PATCH] DNS fix: do not modify last dot character
---
src/packet/DNS.py | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/src/packet/DNS.py b/src/packet/DNS.py
index ce8fb30..52ebe42 100644
--- a/src/packet/DNS.py
+++ b/src/packet/DNS.py
@@ -76,10 +76,13 @@ class DNS(Packet):
# Field is query name
elif field == "qname" and question_record is not None:
old_value = question_record.getfieldval("qname")
+ suffix = old_value[-1]
+ old_value_trimmed = old_value[:-1]
# Randomly change one character in query name
- new_value = old_value
- while new_value == old_value:
- new_value = Packet.bytes_edit_char(old_value)
+ new_value_trimmed = old_value_trimmed
+ while new_value_trimmed == old_value_trimmed:
+ new_value_trimmed = Packet.bytes_edit_char(old_value_trimmed)
+ new_value = new_value_trimmed + bytes(chr(suffix), "utf-8")
question_record.setfieldval("qname", new_value)
# Update checksums
--
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