我正在尝试制作一个模仿netcat的脚本，它有点运行，但我没有得到我想要的结果，当我试图调试它时我设法做了一点但是经过几天的搜索和试用错误我对如何解决问题感到茫然。这是我的全部代码：
import sys
import socket
import getopt
import threading
import subprocess
import os
# define the global variables
listen = False
command = False
upload = False
execute = ""
target = ""
upload_destination = ""
port = 0
def usage():
print "BHP Net Tool"
print "Usage: netcat2.py -t target_host -p port"
print "-l --listen - listen on [host]:[port] for incoming
connections"
print "-e --execute=file_to_run - execute the given file upon receiving
a connection"
print "-c --command - initialize a command shell"
print "-u --upload=destination - upon receiving connection upload a
file and wrtie to [destination]"
print "Examples: "
print "netcat2.py -t 192.168.0.1 -p 5555 -l -c"
print "netcat2.py -t 192.168.0.1 -p 5555 -l -u=C:\\target.exe"
print "netcat2.py -t 192.168.0.1 -p 5555 -l -e=\"cat /etc/passwd\""
print "echo 'ABCDEFGHI' | ./netcat2.py -t 192.168.0.1 -p 135"
sys.exit(0)
def main():
global listen
global port
global execute
global command
global upload_destination
global target
if not len(sys.argv[1:]):
usage()
# read the commandline option
try:
opts, args = getopt.getopt(sys.argv[1:], "hle:t:p:cu", ["help",
"listen", "execute", "target", "port", "command", "upload"])
except getopt.GetoptError as err:
print str(err)
usage()
for o, a in opts:
if o in ("-h", "--help"):
usage()
elif o in ("-l", "--listen"):
listen = True
elif o in ("-e", "--execute"):
execute = a
elif o in ("-c", "--commandshell"):
command = True
elif o in ("-u", "--upload"):
upload_destination = a
elif o in ("-t", "--target"):
target = a
elif o in ("-p", "--port"):
port = int(a)
else:
assert False, "Unhandled Option"
# are we going to listen or just send data from stdin?
if not listen and len(target) and port > 0:
# read in the line from the commandline
# this will block, so send CTRL-D if not sending input
# to stdin
line = sys.stdin.readline()
print (line)
# send data off
client_sender(line)
# we are going to listen and potentially
# upload things, execute commands, and drop a shell back
# depending on our command line options above
if listen:
server_loop()
def client_sender(line):
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
# connect to our target host
client.connect((target, port))
if len(line):
client.send(line)
while True:
# now wait for data back
recv_len = 1
response = ""
while recv_len:
data = client.recv(4096)
recv_len = len(data)
response += data
if recv_len < 4096:
break
print "response"
# wait for more input
line = raw_input("")
line += "\n"
# send it off
client.sendline()
except:
print "[*] Exception! Exiting."
# tear down the connection
client.close()
def server_loop():
global target
# if no target is defined, we listen on all interfaces
if not len(target):
target = "0.0.0.0"
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind((target, port))
server.listen(5)
while True:
client_socket, addr = server.accept()
# spin off a thread to handle out new client
client_thread = threading.Thread(target=client_handler, args=
(client_socket,))
client_thread.start()
def run_command(command):
# trim the newline
command = command.rstrip()
# run the command and get the output back
try:
with open(os.devnull, 'w') as devnull:
output = subprocess.check_output(command,
stderr=subprocess.STDOUT, shell=True)
except:
output = "Failed to execite command. \r\n"
# send the output back to the client
return output
def client_handler(client_socket):
global upload
global execute
global command
# check for upload
if len(upload_destination):
# read in all of the bytes and write to out destination
file_line = ""
# keep reading data until none is available
while True:
data = client_socket.recv(1024)
if not data:
break
else:
file_line += data
# now we take these bytes and try to write them out
try:
file_descriptor = open(upload_destination, "wb")
file_descriptor.write(file_line)
file_descriptor.close()
# acknowledge that we wrote the file out
client_socket.send("Succesfully saved file to %s\r\n" %
upload_destination)
except:
client_socket.send("Failed to save file to %s\r\n" %
upload_destination)
# check for command execution
if len(execute):
# run the command
output = run_command(execute)
client_socket.send(output)
# now we go into another loop if a command shell was requested
if command:
while True:
# show a simple prompt
client_socket.send("<BHP:#> ")
# now we receive until we see a linefeed (enter key)
cmd_line = ""
while "\n" not in cmd_line:
cmd_line += client_socket.recv(1024)
# send back the command output
response = run_command(cmd_line)
# send back the response
client_socket.send(response)
main()
当我运行它，并用CTRL + D关闭它退出时，当我关闭终端时，我在localhost中收到此消息：
<BHP:#> Failed to execite command.
<BHP:#>
如果有人能帮助我解决这个问题，甚至指出我正确的方向我真的很感激:)，我试图在python 2.7中运行它