/*      $NetBSD: mopd.c,v 1.17 2022/05/28 21:14:57 andvar Exp $ */

/*
 * Copyright (c) 1993-96 Mats O Jansson.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "port.h"
#ifndef lint
__RCSID("$NetBSD: mopd.c,v 1.17 2022/05/28 21:14:57 andvar Exp $");
#endif

/*
 * mopd - MOP Dump/Load Daemon
 *
 * Usage:       mopd -a [ -d -f -v ] [ -3 | -4 ]
 *              mopd [ -d -f -v ] [ -3 | -4 ] interface
 */

#include "os.h"
#include "cmp.h"
#include "common.h"
#include "device.h"
#include "dl.h"
#include "get.h"
#include "mopdef.h"
#include "pf.h"
#include "print.h"
#include "process.h"
#include "rc.h"

/*
 * The list of all interfaces that are being listened to. 
 * "selects" on the descriptors in this list.
 */
extern struct if_info *iflist;

__dead static void      Usage(void);
void    mopProcess(struct if_info *, u_char *);

int     AllFlag = 0;            /* listen on "all" interfaces */
int     DebugFlag = 0;          /* print debugging messages   */
int     ForegroundFlag = 0;     /* run in foreground          */
int     VersionFlag = 0;        /* print version              */
int     Not3Flag = 0;           /* Not MOP V3 messages.       */
int     Not4Flag = 0;           /* Not MOP V4 messages.       */
int     promisc = 1;            /* Need promisc mode    */
const char *MopdDir = MOP_FILE_PATH;  /* Path to mop directory  */

int
main(int argc, char  **argv)
{
        int     c, pid;

        extern char version[];

        while ((c = getopt(argc, argv, "34adfs:v")) != -1) {
                switch (c) {
                        case '3':
                                Not3Flag++;
                                break;
                        case '4':
                                Not4Flag++;
                                break;
                        case 'a':
                                AllFlag++;
                                break;
                        case 'd':
                                DebugFlag++;
                                break;
                        case 'f':
                                ForegroundFlag++;
                                break;
                        case 's':
                                MopdDir = optarg;
                                break;
                        case 'v':
                                VersionFlag++;
                                break;
                        default:
                                Usage();
                                /* NOTREACHED */
                }
        }
        argc -= optind;
        argv += optind;

        if (VersionFlag) {
                fprintf(stdout,"%s: version %s\n", getprogname(), version);
                exit(0);
        }

        if ((AllFlag && argc != 0) || (!AllFlag && argc == 0) ||
            (Not3Flag && Not4Flag))
                Usage();

        /* All error reporting is done through syslogs. */
        openlog("mopd", LOG_PID, LOG_DAEMON);

        if ((!ForegroundFlag) && DebugFlag)
                fprintf(stdout,
                    "%s: not running as daemon, -d given.\n", getprogname());

        if ((!ForegroundFlag) && (!DebugFlag)) {
                pid = fork();
                if (pid > 0)
                        /* Parent exits, leaving child in background. */
                        exit(0);
                else
                        if (pid == -1) {
                                syslog(LOG_ERR, "cannot fork");
                                exit(0);
                        }

                /* Fade into the background */
                daemon(0, 0);
                pidfile(NULL);
        }

        syslog(LOG_INFO, "%s %s started.", getprogname(), version);

        if (AllFlag)
                deviceInitAll();
        else {
                while (argc--)
                        deviceInitOne(*argv++);
        }

        Loop();
        /* NOTREACHED */
        return (0);
}

static void
Usage(void)
{
        (void) fprintf(stderr, "usage: %s -a [ -d -f -v ] [ -3 | -4 ]\n",
            getprogname());
        (void) fprintf(stderr, "       %s [ -d -f -v ] [ -3 | -4 ]\n",
            getprogname());
        (void) fprintf(stderr, "           interface [...]\n");
        exit(1);
}

/*
 * Process incoming packages.
 */
void
mopProcess(struct if_info *ii, u_char *pkt)
{
        const u_char    *dst, *src;
        u_short  ptype;
        int      idx, trans, len;

        /* We don't known with transport, Guess! */

        trans = mopGetTrans(pkt, 0);

        /* Ok, return if we don't wan't this message */

        if ((trans == TRANS_ETHER) && Not3Flag) return;
        if ((trans == TRANS_8023) && Not4Flag)  return;

        idx = 0;
        mopGetHeader(pkt, &idx, &dst, &src, &ptype, &len, trans);

        /*
         * Ignore our own transmissions
         *
         */     
        if (mopCmpEAddr(ii->eaddr,src) == 0)
                return;

        switch(ptype) {
        case MOP_K_PROTO_DL:
                mopProcessDL(stdout, ii, pkt, &idx, dst, src, trans, len);
                break;
        case MOP_K_PROTO_RC:
                mopProcessRC(stdout, ii, pkt, &idx, dst, src, trans, len);
                break;
        default:
                break;
        }
}