From 86ad139195a9aabd4ea5c37660a1f41c2c1eff8f Mon Sep 17 00:00:00 2001
From: Guillaume Valadon <guillaume@valadon.net>
Date: Wed, 6 Jul 2016 16:42:50 +0200
Subject: [PATCH] Add explicit support for IPv4 mDNS
---
scapy/layers/inet.py | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/scapy/layers/inet.py b/scapy/layers/inet.py
index 47c4cc21..cf5cbbff 100644
--- a/scapy/layers/inet.py
+++ b/scapy/layers/inet.py
@@ -396,6 +396,8 @@ class IP(Packet, IPTools):
and (self.payload.type in [3,4,5,11,12]) ):
return self.payload.payload.hashret()
else:
+ if self.dst == "224.0.0.251": # mDNS
+ return struct.pack("B", self.proto) + self.payload.hashret()
if conf.checkIPsrc and conf.checkIPaddr:
return strxor(inet_aton(self.src),inet_aton(self.dst))+struct.pack("B",self.proto)+self.payload.hashret()
else:
@@ -403,8 +405,11 @@ class IP(Packet, IPTools):
def answers(self, other):
if not isinstance(other,IP):
return 0
- if conf.checkIPaddr and (self.dst != other.src):
- return 0
+ if conf.checkIPaddr:
+ if other.dst == "224.0.0.251" and self.dst == "224.0.0.251": # mDNS
+ return self.payload.answers(other.payload)
+ elif (self.dst != other.src):
+ return 0
if ( (self.proto == socket.IPPROTO_ICMP) and
(isinstance(self.payload, ICMP)) and
(self.payload.type in [3,4,5,11,12]) ):
--
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