Sigcomm 17 (#52)

This problem contains the tutorial exercises and solutions presented at SIGCOMM '17.

SIGCOMM_2017/exercises/hula/generatehula.py

@@ -0,0 +1,82 @@
+#!/usr/bin/env python
+import argparse
+import sys
+import socket
+import random
+import struct
+
+from scapy.all import sendp, send, get_if_list, get_if_hwaddr, bind_layers
+from scapy.all import Packet
+from scapy.all import Ether, IP, UDP
+from scapy.fields import *
+from time import sleep
+import crcmod
+
+class Hula(Packet):
+   fields_desc = [ BitField("dir", 0, 1),
+                   BitField("qdepth", 0, 15),
+                   XIntField("digest", None)]
+   def post_build(self, p, pay):
+        p += pay
+        if self.digest is None:
+            crc32 = crcmod.Crc(0x104c11db7, initCrc=0, xorOut=0xFFFFFFFF)
+            crc32.update(str(p));
+            c = bytes(bytearray.fromhex("%08x" % crc32.crcValue))
+            p = p[:2]+ c +p[6:]
+            #ck = checksum(p)
+            #p = p[:2]+"\x00\x00"+chr(ck>>8)+chr(ck&0xff)+p[6:]
+        return p
+
+class SourceRoute(Packet):
+   fields_desc = [ BitField("bos", 0, 1),
+                   BitField("port", 0, 15)]
+
+bind_layers(Ether, Hula, type=0x2345)
+bind_layers(Hula, SourceRoute)
+bind_layers(SourceRoute, SourceRoute, bos=0)
+bind_layers(SourceRoute, IP, bos=1)
+
+def main():
+    period = 0
+    if len(sys.argv) > 1:
+        period = int(sys.argv[1])
+
+            # src,     dst     , src routing , interface
+    info = [
+            ("10.0.1.0", "10.0.2.0", (2, 2, 1, 1), "s1-eth1"),
+            ("10.0.1.0", "10.0.2.0", (3, 2, 1, 1), "s1-eth1"),
+            ("10.0.1.0", "10.0.3.0", (2, 3, 1, 1), "s1-eth1"),
+            ("10.0.1.0", "10.0.3.0", (3, 3, 1, 1), "s1-eth1"),
+            ("10.0.2.0", "10.0.1.0", (2, 1, 2, 1), "s2-eth1"),
+            ("10.0.2.0", "10.0.1.0", (3, 1, 2, 1), "s2-eth1"),
+            ("10.0.2.0", "10.0.3.0", (2, 3, 2, 1), "s2-eth1"),
+            ("10.0.2.0", "10.0.3.0", (3, 3, 2, 1), "s2-eth1"),
+            ("10.0.3.0", "10.0.1.0", (2, 1, 3, 1), "s3-eth1"),
+            ("10.0.3.0", "10.0.1.0", (3, 1, 3, 1), "s3-eth1"),
+            ("10.0.3.0", "10.0.2.0", (2, 2, 3, 1), "s3-eth1"),
+            ("10.0.3.0", "10.0.2.0", (3, 2, 3, 1), "s3-eth1")]
+
+
+    try:
+      while True:
+          for e in info:
+            ports = e[2]
+            pkt =  Ether(src=get_if_hwaddr(e[3]), dst='ff:ff:ff:ff:ff:ff')
+            pkt = pkt / Hula(dir=0, qdepth=0)
+            pkt = pkt / SourceRoute(bos=0, port=ports[0])
+            pkt = pkt / SourceRoute(bos=0, port=ports[1])
+            pkt = pkt / SourceRoute(bos=0, port=ports[2])
+            pkt = pkt / SourceRoute(bos=1, port=ports[3])
+            pkt = pkt / IP(dst=e[1], src=e[0]) / UDP(dport=4321, sport=1234)
+            #pkt.show2()
+            sendp(pkt, iface=e[3], verbose=False)
+          if period == 0:
+              break;
+          else:
+              sleep(period)
+    except KeyboardInterrupt:
+        raise
+
+
+if __name__ == '__main__':
+    main()