python实现类似nc的文件上传脚本问题 10C

在看一本python黑帽子,有一个类似nc的程序,可以实现远程执行命令和文件上传等功能程序如下:

 #!/opt/local/bin/python2.7

import sys
import socket
import getopt
import threading
import subprocess


# define some global variables
listen             = False
command            = False
upload             = False
execute            = ""
target             = ""
upload_destination = ""
port               = 0

# this runs a command and returns the output
def run_command(command):

        # trim the newline
        command = command.rstrip()

        # run the command and get the output back
        try:
                output = subprocess.check_output(command,stderr=subprocess.STDOUT, shell=True)
        except OSError as reason:
                output = "Failed to execute command.\r\n Because"+str(reason)

        # send the output back to the client
        return output

# this handles incoming client connections
def client_handler(client_socket):
        global upload
        global execute
        global command
        # check for upload
        if len(upload_destination):
                #file_buffer=[]
                file_buffer = ""
                # keep reading data until none is available
                while True:
                        data = client_socket.recv(1024)
                        if not data:
                                break
                        file_buffer+=data
                '''while True:
                        data=client_socket.recv(1024)
                        print data
                        if data.strip('\n'):
                                file_buffer.append(data)                               
                        else:
                                break
                '''
                # now we take these bytes and try to write them out
                try:
                        file_descriptor = open(upload_destination,"wb")
                        file_descriptor.write(file_buffer)
                        file_descriptor.close()

                        # acknowledge that we wrote the file out
                        client_socket.send("Successfully saved file to %s\r\n" % upload_destination)
                except OSError as reason :
                        #client_socket.send("Failed to save file to %s\r\n Because"+str() % upload_destination)
                        client_socket.send("Failed , Because"+str())


        # 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_buffer = ""
                        while "\n" not in cmd_buffer:
                                cmd_buffer += client_socket.recv(1024)


                        # we have a valid command so execute it and send back the results
                        response = run_command(cmd_buffer)

                        # send back the response
                        client_socket.send(response)

# this is for incoming connections
def server_loop():
        global target
        global port

        # 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(100)        

        while True:
                client_socket, addr = server.accept()

                # spin off a thread to handle our new client
                client_thread = threading.Thread(target=client_handler,args=(client_socket,))
                client_thread.start()


# if we don't listen we are a client....make it so.
def client_sender(buffer):

        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

        try:
                # connect to our target host
                client.connect((target,port))

                # if we detect input from stdin send it 
                # if not we are going to wait for the user to punch some in

                if len(buffer):

                        client.send(buffer)

                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, 
                        #break

                        # wait for more input
                        buffer = raw_input("")
                        buffer += "\n"                        

                        # send it off
                        client.send(buffer)


        except:
                # just catch generic errors - you can do your homework to beef this up
                print "[*] Exception! Exiting."

                # teardown the connection                  
                client.close()  




def usage():
        print "Netcat Replacement"
        print
        print "Usage: bhpnet.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 write to [destination]"
        print
        print
        print "Examples: "
        print "bhpnet.py -t 192.168.0.1 -p 5555 -l -c"
        print "bhpnet.py -t 192.168.0.1 -p 5555 -l -u=c:\\target.exe"
        print "bhpnet.py -t 192.168.0.1 -p 5555 -l -e=\"cat /etc/passwd\""
        print "echo 'ABCDEFGHI' | ./bhpnet.py -t 192.168.11.12 -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 options
        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 buffer from the commandline
                # this will block, so send CTRL-D if not sending input
                # to stdin
                buffer = sys.stdin.read()
                #buffer=raw_input('>')

                # send data off
                client_sender(buffer)   

        # 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:
                print "listenning"
                server_loop()

main()       

但是无法实现远程写入文件
图片说明
这里循环貌似无法正常退出来,请问是什么问题?

写入文件时服务端监听命令:
python bhnet.py -l -p 9999 -u ./test1.txt
客户端命令:
python bhnet.py -t 10.10.10.130 -p 9999
输入数据后按ctrl+d发送数据

2个回答

socket send数据之后要close 否侧会在循环中直到天荒地老

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