Adding DHCP test cases
diff --git a/src/test/utils/DHCP.py b/src/test/utils/DHCP.py
new file mode 100644
index 0000000..cafa95e
--- /dev/null
+++ b/src/test/utils/DHCP.py
@@ -0,0 +1,110 @@
+from scapy.all import *
+
+conf.verb = 0 # Disable Scapy verbosity
+conf.checkIPaddr = 0 # Don't check response packets for matching destination IPs
+
+class DHCPTest:
+
+ def __init__(self, seed_ip = '192.168.1.1', iface = 'veth0'):
+ self.seed_ip = seed_ip
+ self.seed_mac = self.ipToMac(self.seed_ip)
+ self.iface = iface
+ self.mac_map = {}
+ self.mac_inverse_map = {}
+
+ def is_mcast(self, ip):
+ mcast_octet = (atol(ip) >> 24) & 0xff
+ return True if mcast_octet >= 224 and mcast_octet <= 239 else False
+
+ def send(self, mac = None, update_seed = False):
+ '''Send a DHCP discover/offer'''
+
+ if mac is None:
+ mac = self.seed_mac
+ if update_seed:
+ self.seed_ip = self.incIP(self.seed_ip)
+ self.seed_mac = self.ipToMac(self.seed_ip)
+ mac = self.seed_mac
+
+ chmac = self.macToChaddr(mac)
+ L2 = Ether(dst="ff:ff:ff:ff:ff:ff", src=mac)
+ L3 = IP(src="0.0.0.0", dst="255.255.255.255")
+ L4 = UDP(sport=68, dport=67)
+ L5 = BOOTP(chaddr=chmac)
+ L6 = DHCP(options=[("message-type","discover"),"end"])
+ resp = srp1(L2/L3/L4/L5/L6, filter="udp and port 68", timeout=5, iface=self.iface)
+ try:
+ srcIP = resp.yiaddr
+ serverIP = resp.siaddr
+ except AttributeError:
+ print("Failed to acquire IP via DHCP for %s on interface %s" %(mac, self.iface))
+ return (None, None)
+
+ for x in resp.lastlayer().options:
+ if(x == 'end'):
+ break
+ op,val = x
+ if(op == "subnet_mask"):
+ subnet_mask = val
+ elif(op == 'server_id'):
+ server_id = val
+
+ L5 = BOOTP(chaddr=chmac, yiaddr=srcIP)
+ L6 = DHCP(options=[("message-type","request"), ("server_id",server_id),
+ ("subnet_mask",subnet_mask), ("requested_addr",srcIP), "end"])
+ srp1(L2/L3/L4/L5/L6, filter="udp and port 68", timeout=5, iface=self.iface)
+ self.mac_map[mac] = (srcIP, serverIP)
+ self.mac_inverse_map[srcIP] = (mac, serverIP)
+ return (srcIP, serverIP)
+
+ def send_next(self):
+ '''Send next dhcp discover/request with updated mac'''
+
+ return self.send(update_seed = True)
+
+ def macToChaddr(self, mac):
+ rv = []
+ mac = mac.split(":")
+ for x in mac:
+ rv.append(chr(int(x, 16)))
+ return reduce(lambda x,y: x + y, rv)
+
+ def get_ip(self, mac):
+ if self.mac_map.has_key(mac):
+ return self.mac_map[mac]
+ return (None, None)
+
+ def get_mac(self, ip):
+ if self.mac_inverse_map.has_key(ip):
+ return self.mac_inverse_map[ip]
+ return (None, None)
+
+ def ipToMac(self, ip):
+ '''Generate a mac from a ip'''
+
+ mcast = self.is_mcast(ip)
+ mac = "01:00:5e" if mcast == True else "00:00:00"
+ octets = ip.split(".")
+ for x in range(1,4):
+ num = str(hex(int(octets[x])))
+ num = num.split("x")[1]
+ if len(num) < 2:
+ num = "0" + str(num)
+ mac += ":" + num
+ return mac
+
+ def incIP(self, ip, n=1):
+ '''Increment an IP'''
+
+ if n < 1:
+ return ip
+ o = ip.split(".")
+ for ii in range(3,-1,-1):
+ if int(o[ii]) < 255:
+ o[ii] = str(int(o[ii]) + 1)
+ break
+ else:
+ o[ii] = str(0)
+
+ n -= 1
+ return self.incIP(".".join(o), n)