Question

我创建了自定义漏斗包。我想将它们转换为字符串并返回（以模拟接收数据包），但是它不起作用。

这是我的代码：

main.py：

#!/usr/bin/env python3
import packet

orig_packet = packet.ENIP_TCP() / packet.ENIP_RegisterSession()
orig_packet.show()
str_packet = str(orig_packet[0])
print(str_packet)
dest_packet = packet.ENIP_TCP(str_packet)
dest_packet.show()
reg_session_reply = packet.ENIP_RegisterSession(dest_packet['Raw'])
reg_session_reply.show()

和packet.py：

#!/usr/bin/env python3
'''
This file was partly made thanks to scapy-cip-enip
You can find the github repository here : https://github.com/scy-phy/scapy-cip-enip
The code was modified to fully complied with the ENIP certification book Edition 1.4 November 2007
'''
import struct
from scapy import all as scapy_all

class ENIP_TCP(scapy_all.Packet):
    """Ethernet/IP packet over TCP"""
    name = "ENIP_TCP"
    fields_desc = [
        scapy_all.LEShortEnumField("command", None, {
            0x0000: "NOP",
            0x0004: "ListServices",
            0x0063: "ListIdentity",
            0x0064: "ListInterfaces",
            0x0065: "RegisterSession",
            0x0066: "UnregisterSession",
            0x006f: "SendRRData",
            0x0070: "SendUnitData",
            0x0072: "IndicateStatus",
            0x0073: "Cancel",
        }),
        scapy_all.LEShortField("length", None),
        scapy_all.LEIntField("session_handle", 0),
        scapy_all.LEIntEnumField("status", 0, {
            0x0000: "success",
            0x0001: "Invalid/Unsupported command",
            0x0002: "Insufficient memory resources",
            0x0003: "Incorrect data",
            0x0064: "Invalid session handle",
            0x0065: "Invalid message length",
            0x0069: "Unsupportes encapsulation protocol revision",
        }),
        scapy_all.LELongField("sender_context", 0x0000000000000042),
        scapy_all.LEIntField("options", 0),
    ]

    def extract_padding(self, p):
        return p[:self.length], p[self.length:]

    def post_build(self, p, pay):
        if self.length is None and pay:
            l = len(pay)
            p = p[:2] + struct.pack("<H", l) + p[4:]
        return p + pay

scapy_all.bind_layers(scapy_all.TCP, ENIP_TCP, dport=44818)
scapy_all.bind_layers(scapy_all.TCP, ENIP_TCP, sport=44818)

class ENIP_RegisterSession(scapy_all.Packet):
    name = "ENIP_RegisterSession"
    fields_desc = [
        scapy_all.LEShortField("protocol_version", 1),
        scapy_all.LEShortField("options_flags", 0),
    ]

scapy_all.bind_layers(ENIP_TCP, ENIP_RegisterSession, command=0x0065)

当打印原始数据包或str数据包时，一切看起来都很好，但是当显示dest数据包时，没有任何内容与原始数据包匹配，我也不知道为什么。

编辑： 经过更多研究后，我发现这可能是与python3相关的问题。我认为str_packet很好，因为它显示为

b'e \ 0x00 \ 0x04 ...'

但是，如果我对该字符串进行编码，则结果为

b“ b'e \ x00 \ x04 \ ...'”

我现在的问题是，除了修剪字符串（难看）之外，我不知道如何删除开头的b'和结尾的'。我该怎么办？

重新编辑： 我找到了解决方案，而不是：

str_packet = str（orig_packet [0]）

我愿意

str_packet =字节（orig_packet [0]）

一切正常

Scapy将数据包转换为字符串并返回不起作用

0 个答案: