#!/usr/bin/env python3

# Author: Bandie Canis
# License: 2-Clause BSD License

import sys, ssl, socket, os, getopt
import configparser


host = None
port = 0
cafile = None
certfile = None
keyfile = None
exitcode = 1

def init(conf):

  if(conf == None):
    if(os.name == 'nt'):
      CONFIG = "ding.win.cfg"
    else:
      CONFIG = "ding.cfg"
  else:
    CONFIG = conf

  cfg = configparser.ConfigParser()
  try:
    cfg.read(CONFIG)

    global host, port, cafile, certfile, keyfile
    host = cfg.get("Client", "host")
    port = int(cfg.get("Client", "port"))

    cafile = cfg.get("Client", "cafile")
    certfile = cfg.get("Client", "certfile")
    keyfile = cfg.get("Client", "keyfile")
  except configparser.NoSectionError:
    print("No suitable config found. Expecting some config in", CONFIG, file=sys.stderr)
    quit(3)


def send(conn, cmd):

  conn.connect((host, port))
  buf = conn.recv(1024)
  if(buf == b"OK 1337\n"):
    conn.sendall(cmd)
    buf = conn.recv(1024)
    if(buf == b"OK CMD"):
      exitcode = 0
    elif(buf == b"ERR NO_CMD"):
      print("Error. Server said: The command isn't set on the server.", file=sys.stderr)
      exitcode = 1
    elif(buf == b"ERR CMD_ERR"):
      print("Error. Server said: The command doesn't work because the file doesn't exist on the server.", file=sys.stderr)
      exitcode = 2
    elif(buf == b"ERR PW"):
      print("Error. Password required. The password was wrong.", file=sys.stderr)
      exitcode = 4
    elif(b"OK PW" in buf):
      bufr=str(buf.decode('utf-8'))
      print("Password accepted. Timeout:", bufr.replace("OK PW ",""), "seconds.")

  else:
    conn.sendall(b"NO.")
    print("The server seems to be crazy. Nothing sent.", file=sys.stderr)

  conn.close()
  quit(exitcode)


def main(arg):
  try:
    context = ssl.SSLContext(ssl.PROTOCOL_TLS)
    context.verify_mode = ssl.CERT_REQUIRED
    context.load_verify_locations(cafile)
    context.load_cert_chain(certfile=certfile, keyfile=keyfile)
  except FileNotFoundError as e:
    print(e)
    print("Please check your paths in the config file. (Have you forgotten to generate the Certificates?)", sep="", file=sys.stderr)
    quit(2)

  if(":" in host):
    conn = context.wrap_socket(socket.socket(family=socket.AF_INET6))
  else:
    conn = context.wrap_socket(socket.socket(family=socket.AF_INET))


  try:
    send(conn, bytes(arg[0], sys.stdin.encoding))
  except IndexError:
    print(sys.argv[0], ": Missing argument.\nSyntax: ", sys.argv[0], " <COMMAND>", file=sys.stderr)
  except ConnectionRefusedError:
    print("Connection refused.", file=sys.stderr)
    quit(1)
  except ssl.SSLError:
    print("Wrong certificate.", file=sys.stderr);
    quit(3)



if(__name__ == "__main__"):
  try:
    conf = None
    opts, args = getopt.getopt(sys.argv[1:], "c:")
    for o, a in opts:
      if o == "-c":
        conf = a
    init(conf)
    main(args)
  except getopt.GetoptError as e:
    print("Error using options. Allowed options:\n-c [FILE] - Config file\n")
    quit(2)

  quit(exitcode)