udptunnel.c

/*
 * Project: udptunnel
 * File: udptunnel.c
 *
 * Copyright (C) 2009 Daniel Meekins
 * Contact: dmeekins - gmail
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>
#include <stdlib.h>

#ifndef WIN32
#include <unistd.h>
#else
#include "helpers/winhelpers.h"
#endif

#include "common.h"
#include "socket.h"

int debug_level = NO_DEBUG;
int ipver = SOCK_IPV4;

int udpclient(int argc, char *argv[]);
int udppipe(int argc, char *argv[]);
void usage(char *progname);

int main(int argc, char *argv[])
{
    int ret;
    int isserv = 0;

#ifdef WIN32    
    WSADATA wsa_data;
    ret = WSAStartup(MAKEWORD(2,0), &wsa_data);
    ERROR_GOTO(ret != 0, "WSAStartup() failed", error);
#endif

    while((ret = getopt(argc, argv, "hpscv6")) != EOF)
    {
        switch(ret)
        {
            case '6':
                ipver = SOCK_IPV6;
                break;
                
            case 's':
                isserv = 1;
                break;
                
            case 'c':
                isserv = 0;
                break;

            case 'p':
                isserv = 2;
                break;

            case 'v':
                if(debug_level < 3)
                    debug_level++;
                break;
                
            case 'h':
                /* fall through */
            default:
                goto error;
        }
    }

    ret = 0;
    
    if (isserv == 2)
    {
        ret = udppipe(argc - optind, argv + optind);
    }
    else if(isserv == 1)
    {
        if(argc - optind < 1)
            goto error;
        //ret = udpserver(argc - optind, argv + optind);
    }
    else
    {
        if(argc - optind != 5 && argc - optind != 6)
            goto error;
        ret = udpclient(argc - optind, argv + optind);
    }

#ifdef WIN32
    WSACleanup();
#endif
    
    return ret;
    
  error:
    usage(argv[0]);
    exit(1);
}

void usage(char *progname)
{
    printf("usage: %s [-v] [-6] <-s|-c> <args>\n", progname);
    printf("  -c    client mode (default)\n"
           "        <args>: [local host] <local port> <proxy host> <proxy port>\n"
           "                <remote host> <remote port>\n"
           "  -s    server mode\n"
           "        <args>: [host] port [acl ...]\n"
           "        acl: [s=<src ip>,][d=<dst ip>,][dp=<dst port>,][a=allow|deny]\n"
           "  -6    use IPv6\n"
           "  -v    show some debugging output (use up to 3 for increaing levels)\n"
           "  -h    show this junks and exit\n");
}