add script for diff'ing checksums

bin/checksum_delta_diff_test.py

@@ -0,0 +1,51 @@
+#!/usr/bin/python3
+
+from scapy.all import *
+
+if __name__ == '__main__':
+    p = []
+
+    e0 = Ether(src="00:00:00:00:00:00",
+               dst="00:00:00:00:00:00")
+
+    e = Ether(src="02:53:55:42:45:01",
+              dst='ff:ff:ff:ff:ff:ff')
+
+    i0 = IP(src = "0.0.0.0",
+            dst = "0.0.0.0")
+
+    i4 = IP(src = "192.168.1.1",
+            dst = "192.168.4.2")
+
+    i6 = IPv6(src = "2001:db8:42::1",
+             dst = "2001:db8::2")
+
+    t0 = TCP(dport=0, sport=0)
+    #t = TCP(dport=80, sport=random.randint(49152,65535))
+
+    #    print("chk_t = {}".format(t))
+    t = TCP(dport=80, sport=1337)
+
+    #print("chk_t = {}".format(t))
+
+    d0 = ""
+    d = "A"
+
+    p.append(e / i4 / t / d)
+    p.append(e / i6 / t / d)
+
+    for packet in p:
+        print("p = {}".format(packet.__repr__()))
+        packet_rebuild = packet.__class__(str(packet))
+        chk_old = packet[TCP].chksum
+        chk_new = packet_rebuild[TCP].chksum
+        print("chk1 = {} chk2={}".format(chk_old, chk_new))
+
+# Checksums:
+# - tcp
+# - udp
+# - icmp6
+# - icmp
+# - ipv4 (no payload)
+#
+#         t.chksum = None