Python Raw Socket使用示例(发送TCP SYN数据包)

说实话，Python真的不太适合做这种二进制的东西，天生没有指针，导致在C/C++很容易的东西在Python下就很麻烦。不过好像3.1有了原生的bytes类型，不知道能不能改变现状。
import sys
import time
import socket
import struct
import random
def SendPacketData (Buffer = None , DestIP = "127.0.0.1" , DestPort = 0) :
"""SendPacketData"""

if Buffer is None :
return False

try:
Socket = socket.socket(socket.AF_INET,socket.SOCK_RAW)
Socket.setsockopt(socket.IPPROTO_IP,socket.IP_HDRINCL,1)
Socket.setsockopt(socket.SOL_SOCKET,socket.SO_SNDTIMEO,2000)

except:
Socket.close()
return False

try:
Socket.sendto(Buffer,0,(DestIP , DestPort))

except:
Socket.close()

return True
def SetPacketAddress (Number = 1) :
"""SetPakcetAddress"""

return [".".join(["%d" % random.randint(1 , 0xFF) for i in range(0,4)]) for n in range(0 , Number)]
def SetPacketData (Length = 32) :
"""SetPacketData"""
return "".join(["%s" % chr(random.randint(0 , 255)) for n in range(Length)])
def SetPacketCheckSum (Buffer = None) :
"""SetPacketCheckSum"""

if Buffer == None :
return False

if len(Buffer) % 2 :
Buffer += '\0'
return ~sum([(ord(Buffer[n + 1]) << 8) + ord(Buffer[n]) for n in range(0 , len(Buffer) , 2)])
#or return ~sum([ord(Buffer[n]) + ord(Buffer[n + 1]) * 256 for n in range(0 , len(Buffer) , 2)])
def SynSendInit (DestIP = "127.0.0.1" , DestPort = 80) :
"""SynSendInit"""

IpHdrLen = 20
TcpHdrLen = 20

IpVerlen = (4 << 4 | IpHdrLen / 4)
IpTotal_len = socket.htons(IpHdrLen + TcpHdrLen)

IpDestIP = struct.unpack('i',socket.inet_aton(DestIP))[0]
IpSourceIP = struct.unpack('i',socket.inet_aton(SetPacketAddress()[0]))[0]

TcpSport = socket.htons(random.randint(1024 , 65000))
TcpDport = socket.htons(DestP