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/*
* $Id: mnc_opts.c,v 1.3 2004/09/22 16:02:26 colmmacc Exp $
*
* mnc_opts.c -- Multicast NetCat
*
* Colm MacCarthaigh, <colm@apache.org>
*
* Copyright (c) 2007, Colm MacCarthaigh.
* Copyright (c) 2004 - 2006, HEAnet Ltd.
*
* This software is an open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HEAnet Ltd. nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifndef WINDOWS
/* UNIX-y includes */
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#else
/* WINDOWS-y includes */
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#include "mnc.h"
/* Display a usage statement */
void usage(void)
{
fprintf(stderr,
"Usage: mnc [-l] [-i interface] [-p port] group-id "
"[source-address]\n\n"
"-l : listen mode\n"
"-i : specify interface to listen\n"
"-p : specify port to listen/send on\n\n");
exit(1);
}
struct mnc_configuration * parse_arguments(int argc, char **argv)
{
/* Utility variables */
int optind,
errorcode;
struct addrinfo hints;
/* Our persisting configuration */
static struct mnc_configuration config;
/* Set some defaults */
config.mode = SENDER;
config.port = MNC_DEFAULT_PORT;
config.iface = NULL;
config.source = NULL;
/* Loop through the arguments */
for (optind = 1; optind < (argc - 1); optind++)
{
if ( (argv[optind][0] == '-') || (argv[optind][0] == '/') )
{
switch(argv[optind][1])
{
/* Set listening mode */
case 'l': config.mode = LISTENER;
break;
/* Set port */
case 'p': config.port = argv[++optind];
break;
/* Set an interface */
case 'i': config.iface = argv[++optind];
break;
/* Unrecognised option */
default: usage();
break;
}
}
else
{
/* assume we've ran out of options */
break;
}
}
/* There's a chance we were passed one option */
if (optind >= argc || argv[optind][0] == '-')
{
usage();
}
/* Now make sure we have either exactly 1 or 2 more arguments */
if ( (argc - optind) != 1 && (argc - optind) != 2 )
{
/* We have not been given the right ammount of
arguments */
usage();
}
/* You can't have an interface without also listening */
if (config.mode == SENDER && config.iface != NULL)
{
mnc_error("You may only specify the interface when in"
" listening mode\n");
}
/* Set some hints for getaddrinfo */
memset(&hints, 0, sizeof(hints));
/* We want a UDP socket */
hints.ai_socktype = SOCK_DGRAM;
/* Don't do any name-lookups */
hints.ai_flags = AI_NUMERICHOST;
/* Get the group-id information */
if ( (errorcode =
getaddrinfo(argv[optind], config.port, &hints, &config.group)) != 0)
{
mnc_error("Error getting group-id address information: %s\n",
gai_strerror(errorcode));
}
/* Move on to next argument */
optind++;
/* Get the source information */
if ( (argc - optind) == 1)
{
if ( (errorcode =
getaddrinfo(argv[optind], config.port, &hints, &config.source))
!= 0)
{
mnc_error("Error getting source-address information: %s\n",
gai_strerror(errorcode));
}
/* Confirm that the source and group are in the same Address Family */
if ( config.source->ai_family != config.group->ai_family )
{
mnc_error("Group ID and Source address are not of "
"the same type\n");
}
}
return &config;
}
|
