Hey

I'm working on a server-client assignment in python.

The client can send 5 types of requests to the server:

1. get the server's IP
2. get contents of a directory on the server
3. run cmd command on the server and get the output
4. open a calculator on the server
5. disconnect

My server manages to respond to all request, except for type-3 requests.

This is the error I get when I try to run a cmd command on the server code (line 32 on server):

WindowsError: [Error 2] The system cannot find the file specified

server code:

__author__ = 'eyal'

from struct import pack, unpack, calcsize
import socket
from os import listdir
from subprocess import check_output, call


def server():
    ser_soc = socket.socket()
    ser_soc.bind(("0.0.0.0", 8080))
    ser_soc.listen(1)
    while True:
        accept_flag = raw_input("Would you like to wait for a client? (y/n) ")
        if accept_flag == "y":
            client_soc, client_address = ser_soc.accept()
            while True:
                client_structs = client_soc.recv(1024)
                msg_type, data_len = unpack(">BH", client_structs[:calcsize(">BH")])
                if data_len > 0:
                    msg_data = unpack(str(data_len) + "s", client_structs[calcsize(">BH"):])
                if msg_type == 1:
                    ip = socket.gethostbyname(socket.gethostname())
                    to_send = pack(">BH" + str(len(ip)) + "s", msg_type, len(ip), ip)
                elif msg_type == 2:
                    content = listdir(msg_data[0])
                    content_str = "\r\n".join(content)
                    to_send = pack(">BH" + str(len(content_str)) + "s", msg_type,
                                   len(content_str), content_str)
                elif msg_type == 3:
                    command = str(msg_data).split()
                    output = check_output(command) #line32
                    to_send = pack(">BH" + str(len(output)) + "s", msg_type, len(output), output)
                elif msg_type == 4:
                    call("calc")
                    to_send = pack(">BH" + str(len("The calculator is open.")) + "s", msg_type,
                                   len("The calculator is open."), "The calculator is open.")
                elif msg_type == 5:
                    client_soc.close()
                    print "The client has disconnected."
                    break
                else:
                    to_send = pack(">BH" + str(len("invalid message type, try again")) + "s",
                                   msg_type, len("invalid message type, try again"),
                                   "invalid message type, try again")
                if msg_type != 5:
                    client_soc.send(to_send)
        else:
            break
    ser_soc.close()


def main():
    server()

if __name__ == "__main__":
    main()

client code:

__author__ = 'eyal'


from struct import pack, unpack, calcsize
import socket


def client():
    my_soc = socket.socket()
    my_soc.connect(("127.0.0.1", 8080))
    while True:
        send_flag = raw_input("Would you like to send the server a request? (y/n) ")
        if send_flag == "y":
            msg_code = input("What type of request would you like to send?\n"
                             "1. Get the server's IP address.\n"
                             "2. Get content of a directory on the server.\n"
                             "3. Run a cmd command on the server and get the output.\n"
                             "4. Open a calculator on the server.\n"
                             "5. Disconnect from the server.\n"
                             "Your choice: ")
            if msg_code == 1 or msg_code == 4 or msg_code == 5:
                to_send = pack(">BH", msg_code, 0)
            elif msg_code == 2:
                path = raw_input("Enter path of wanted directory to get content of: ")
                to_send = pack(">BH" + str(len(path)) + "s", msg_code, len(path), path)
            elif msg_code == 3:
                command = raw_input("Enter the wanted cmd command, including arguments: ")
                to_send = pack(">BH" + str(len(command)) + "s", msg_code, len(command), command)
            else:
                print **"Invalid message code, try again\n"

            if 1 <= msg_code <= 5:
                my_soc.send(to_send)
            if 1 <= msg_code < 5:
                data = my_soc.recv(1024)
                msg_code, msg_len = unpack(">BH", data[:calcsize(">BH")])
                msg_data = unpack(str(msg_len) + "s", data[calcsize(">BH"):])
                print "The server's response to your type-" + str(msg_code) + " request:"
                print msg_data[0]
            if msg_code == 5:
                print "You have disconnected from the server."
                break
        else:
            break
    my_soc.close()


def main():
    client()


if __name__ == "__main__":
    main()

EDIT: Added position marker at line 32