python - 如何捕获tcp请求包？

Question

我正在 try catch TCP 请求(入站)数据包。正如黑帽Python书中所描述的，这是嗅探器代码。但是这个嗅探器不会捕获tcp请求数据包。我需要从Windows运行环境捕获。

class IP(Structure):
    _fields_ = [
        ("version", c_ubyte, 4),
        ("ihl", c_ubyte, 4),
        ("tos", c_ubyte),
        ("len", c_ushort),
        ("id", c_ushort),
        ("offset", c_ushort),
        ("ttl", c_ubyte),
        ("protocol_num", c_ubyte),
        ("sum", c_ushort),
        ("src", c_uint32),
        ("dst", c_uint32)
    ]

    def __new__(self, socket_buffer=None):
        return self.from_buffer_copy(socket_buffer)

    def __init__(self, socket_buffer=None):

        # map protocol constants to their names
        self.protocol_map = {1:"ICMP", 6:"TCP", 17:"UDP"}

        self.src_address = socket.inet_ntoa(struct.pack("@I",self.src))
        self.dst_address = socket.inet_ntoa(struct.pack("@I",self.dst))

        # human readable protocol
        try:
            self.protocol = self.protocol_map[self.protocol_num]
        except:
            self.protocol = str(self.protocol_num)

if os.name == "nt":
    socket_protocol = socket.IPPROTO_IP
else:
    socket_protocol = socket.IPPROTO_ICMP

sniffer = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket_protocol)

sniffer.bind((host, 0))
sniffer.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)

# to set up promiscuous mode
if os.name == "nt":
    sniffer.ioctl(socket.SIO_RCVALL, socket.RCVALL_ON)

try:
    while True:
        # read in a packet
        raw_buffer = sniffer.recvfrom(65565)[0]

        # create an IP header from the first 20 bytes of the buffer
        ip_header = IP(raw_buffer[0:])

        # print out the protocol that was detected and the hosts
        print "Protocol: %s %s -> %s " % (ip_header.protocol, ip_header.src_address, ip_header.dst_address)

Answer 1

I used wireshark. it capture all incoming and outgoing packets. but python script only captures outgoing packets.

Wireshark 使用 libpcap/WinPcap，它使用操作系统的数据包捕获机制 (libpcap) 或 WinPcap (WinPcap) 的驱动程序提供的机制来捕获数据包。

这不是您正在使用的机制。鉴于您的代码是用 Python 编写的，您可能需要考虑使用 Scapy .