94 lines
2.6 KiB
Python
94 lines
2.6 KiB
Python
#!/usr/bin/env python
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import struct
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import socket
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class DHCPPack:
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fmt = "BBBBIHH4B4B4B4B8H64s128s"
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def __init__(self,data=None):
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if data is not None:
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info = struct.unpack(DHCPPack.fmt, data)
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self.op = info[0]
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self.htype = info[1]
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self.hlen = info[2]
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self.hops = info[3]
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self.xid = info[4]
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self.secs = info[5]
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self.flags = info[6]
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self.ciaddr = tuple(info[7:10])
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self.yiaddr = tuple(info[11:14])
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self.siaddr = tuple(info[15:18])
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self.giaddr = tuple(info[19:22])
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self.chaddr = tuple(info[23:30])
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self.sname = info[31]
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self.file = info[32]
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else:
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self.op = 1
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self.htype = 1
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self.hlen = 6
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self.hops = 0
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self.xid = 0
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self.secs = 0
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self.flags = 0
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self.ciaddr = (0,0,0,0)
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self.yiaddr = (0,0,0,0)
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self.siaddr = (0,0,0,0)
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self.giaddr = (0,0,0,0)
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self.chaddr = (0xDE,0xAD,0xBE,0xEF,0x13,0x37,0x13,0x37)
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self.sname = ""
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self.file = ""
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def pack(self):
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return struct.unpack(DHCPPack.fmt,
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self.op,
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self.htype,
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self.hlen,
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self.hops,
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self.xid,
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self.secs,
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self.flags,
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self.ciaddr[0],
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self.ciaddr[1],
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self.ciaddr[2],
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self.ciaddr[3],
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self.yiaddr[0],
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self.yiaddr[1],
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self.yiaddr[2],
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self.yiaddr[3],
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self.siaddr[0],
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self.siaddr[1],
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self.siaddr[2],
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self.siaddr[3],
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self.giaddr[0],
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self.giaddr[1],
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self.giaddr[2],
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self.giaddr[3],
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self.chaddr[0],
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self.chaddr[1],
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self.chaddr[2],
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self.chaddr[3],
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self.chaddr[4],
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self.chaddr[5],
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self.chaddr[6],
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self.chaddr[7],
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self.sname,
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self.file)
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def main():
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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s.bind(('',68))
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s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
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packet = DHCPPack();
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s.sendto(packet.pack(), ('<broadcast>',67))
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data, addr = sock.recvfrom(1024)
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packet2 = DHCPPack(data)
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if packet2.op == 2:
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print("Got answer")
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else:
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print("WTF")
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main()
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