diff options
Diffstat (limited to 'doc/extcap_example.py')
| -rwxr-xr-x | doc/extcap_example.py | 74 |
1 files changed, 70 insertions, 4 deletions
diff --git a/doc/extcap_example.py b/doc/extcap_example.py index ab9967c489..9007e26bba 100755 --- a/doc/extcap_example.py +++ b/doc/extcap_example.py @@ -40,6 +40,7 @@ other script-based formates beside VBScript """ +from __future__ import print_function import os import sys import signal @@ -52,12 +53,40 @@ from threading import Thread ERROR_USAGE = 0 ERROR_ARG = 1 -ERROR_INTERFACE = 2 +ERROR_INTERFACE = 2 ERROR_FIFO = 3 +ERROR_DELAY = 4 doExit = False globalinterface = 0 +""" +This code has been taken from http://stackoverflow.com/questions/5943249/python-argparse-and-controlling-overriding-the-exit-status-code - originally developed by Rob Cowie http://stackoverflow.com/users/46690/rob-cowie +""" +class ArgumentParser(argparse.ArgumentParser): + def _get_action_from_name(self, name): + """Given a name, get the Action instance registered with this parser. + If only it were made available in the ArgumentError object. It is + passed as it's first arg... + """ + container = self._actions + if name is None: + return None + for action in container: + if '/'.join(action.option_strings) == name: + return action + elif action.metavar == name: + return action + elif action.dest == name: + return action + + def error(self, message): + exc = sys.exc_info()[1] + if exc: + exc.argument = self._get_action_from_name(exc.argument_name) + raise exc + super(ArgumentParser, self).error(message) + def signalHandler(signal, frame): global doExit doExit = True @@ -214,6 +243,23 @@ def extcap_capture(interface, fifo, delay, verify, message, remote, fake_ip): fh.close() +def extcap_close_fifo(interface, fifo): + global doExit + + signal.signal(signal.SIGINT, signalHandler) + signal.signal(signal.SIGTERM , signalHandler) + + tdelay = delay if delay != 0 else 5 + + try: + os.stat(fifo) + except OSError: + doExit = True + print ( "Fifo does not exist!" ) + + fh = open(fifo, 'w+b', 0 ) + fh.close() + #### def usage(): @@ -227,7 +273,7 @@ if __name__ == '__main__': message = "" fake_ip = "" - parser = argparse.ArgumentParser( + parser = ArgumentParser( prog="Extcap Example", description="Extcap example program for python" ) @@ -243,12 +289,26 @@ if __name__ == '__main__': # Interface Arguments parser.add_argument("--verify", help="Demonstrates a verification bool flag", action="store_true" ) - parser.add_argument("--delay", help="Demonstrates an integer variable", type=int, default=0, choices=[0, 1, 2, 3, 4, 5] ) + parser.add_argument("--delay", help="Demonstrates an integer variable", type=int, default=0, choices=[0, 1, 2, 3, 4, 5, 6] ) parser.add_argument("--remote", help="Demonstrates a selector choice", default="if1", choices=["if1", "if2"] ) parser.add_argument("--message", help="Demonstrates string variable", nargs='?', default="" ) parser.add_argument("--fake_ip", help="Add a fake sender IP adress", nargs='?', default="127.0.0.1" ) - args, unknown = parser.parse_known_args() + try: + args, unknown = parser.parse_known_args() + except argparse.ArgumentError, exc: + print( "%s: %s" % ( exc.argument.dest, exc.message ), file=sys.stderr) + fifo_found = 0 + fifo = "" + for arg in sys.argv: + if (arg == "--fifo" or arg == "--extcap-fifo") : + fifo_found = 1 + elif ( fifo_found == 1 ): + fifo = arg + break + extcap_close_fifo("", fifo) + sys.exit(ERROR_ARG) + if ( len(sys.argv) <= 1 ): parser.exit("No arguments given!") @@ -282,6 +342,12 @@ if __name__ == '__main__': elif args.capture: if args.fifo is None: sys.exit(ERROR_FIFO) + # The following code demonstrates error management with extcap + if args.delay > 5: + print("Value for delay [%d] too high" % args.delay, file=sys.stderr) + extcap_close_fifo(interface, args.fifo) + sys.exit(ERROR_DELAY) + extcap_capture(interface, args.fifo, args.delay, args.verify, message, args.remote, fake_ip) else: usage() |