Home | History | Annotate | Line # | Download | only in mopd 
      1 /*	$NetBSD: mopd.c,v 1.17 2022/05/28 21:14:57 andvar Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1993-96 Mats O Jansson.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 #include "port.h"
     27 #ifndef lint
     28 __RCSID("$NetBSD: mopd.c,v 1.17 2022/05/28 21:14:57 andvar Exp $");
     29 #endif
     30 
     31 /*
     32  * mopd - MOP Dump/Load Daemon
     33  *
     34  * Usage:	mopd -a [ -d -f -v ] [ -3 | -4 ]
     35  *		mopd [ -d -f -v ] [ -3 | -4 ] interface
     36  */
     37 
     38 #include "os.h"
     39 #include "cmp.h"
     40 #include "common.h"
     41 #include "device.h"
     42 #include "dl.h"
     43 #include "get.h"
     44 #include "mopdef.h"
     45 #include "pf.h"
     46 #include "print.h"
     47 #include "process.h"
     48 #include "rc.h"
     49 
     50 /*
     51  * The list of all interfaces that are being listened to.
     52  * "selects" on the descriptors in this list.
     53  */
     54 extern struct if_info *iflist;
     55 
     56 __dead static void	Usage(void);
     57 void	mopProcess(struct if_info *, u_char *);
     58 
     59 int     AllFlag = 0;		/* listen on "all" interfaces */
     60 int     DebugFlag = 0;		/* print debugging messages   */
     61 int	ForegroundFlag = 0;	/* run in foreground          */
     62 int	VersionFlag = 0;	/* print version              */
     63 int	Not3Flag = 0;		/* Not MOP V3 messages.       */
     64 int	Not4Flag = 0;		/* Not MOP V4 messages.       */
     65 int	promisc = 1;		/* Need promisc mode    */
     66 const char *MopdDir = MOP_FILE_PATH;  /* Path to mop directory  */
     67 
     68 int
     69 main(int argc, char  **argv)
     70 {
     71 	int	c, pid;
     72 
     73 	extern char version[];
     74 
     75 	while ((c = getopt(argc, argv, "34adfs:v")) != -1) {
     76 		switch (c) {
     77 			case '3':
     78 				Not3Flag++;
     79 				break;
     80 			case '4':
     81 				Not4Flag++;
     82 				break;
     83 			case 'a':
     84 				AllFlag++;
     85 				break;
     86 			case 'd':
     87 				DebugFlag++;
     88 				break;
     89 			case 'f':
     90 				ForegroundFlag++;
     91 				break;
     92 			case 's':
     93 				MopdDir = optarg;
     94 				break;
     95 			case 'v':
     96 				VersionFlag++;
     97 				break;
     98 			default:
     99 				Usage();
    100 				/* NOTREACHED */
    101 		}
    102 	}
    103 	argc -= optind;
    104 	argv += optind;
    105 
    106 	if (VersionFlag) {
    107 		fprintf(stdout,"%s: version %s\n", getprogname(), version);
    108 		exit(0);
    109 	}
    110 
    111 	if ((AllFlag && argc != 0) || (!AllFlag && argc == 0) ||
    112 	    (Not3Flag && Not4Flag))
    113 		Usage();
    114 
    115 	/* All error reporting is done through syslogs. */
    116 	openlog("mopd", LOG_PID, LOG_DAEMON);
    117 
    118 	if ((!ForegroundFlag) && DebugFlag)
    119 		fprintf(stdout,
    120 		    "%s: not running as daemon, -d given.\n", getprogname());
    121 
    122 	if ((!ForegroundFlag) && (!DebugFlag)) {
    123 		pid = fork();
    124 		if (pid > 0)
    125 			/* Parent exits, leaving child in background. */
    126 			exit(0);
    127 		else
    128 			if (pid == -1) {
    129 				syslog(LOG_ERR, "cannot fork");
    130 				exit(0);
    131 			}
    132 
    133 		/* Fade into the background */
    134 		daemon(0, 0);
    135 		pidfile(NULL);
    136 	}
    137 
    138 	syslog(LOG_INFO, "%s %s started.", getprogname(), version);
    139 
    140 	if (AllFlag)
    141  		deviceInitAll();
    142 	else {
    143 		while (argc--)
    144 			deviceInitOne(*argv++);
    145 	}
    146 
    147 	Loop();
    148 	/* NOTREACHED */
    149 	return (0);
    150 }
    151 
    152 static void
    153 Usage(void)
    154 {
    155 	(void) fprintf(stderr, "usage: %s -a [ -d -f -v ] [ -3 | -4 ]\n",
    156 	    getprogname());
    157 	(void) fprintf(stderr, "       %s [ -d -f -v ] [ -3 | -4 ]\n",
    158 	    getprogname());
    159 	(void) fprintf(stderr, "           interface [...]\n");
    160 	exit(1);
    161 }
    162 
    163 /*
    164  * Process incoming packages.
    165  */
    166 void
    167 mopProcess(struct if_info *ii, u_char *pkt)
    168 {
    169 	const u_char	*dst, *src;
    170 	u_short  ptype;
    171 	int	 idx, trans, len;
    172 
    173 	/* We don't known with transport, Guess! */
    174 
    175 	trans = mopGetTrans(pkt, 0);
    176 
    177 	/* Ok, return if we don't wan't this message */
    178 
    179 	if ((trans == TRANS_ETHER) && Not3Flag) return;
    180 	if ((trans == TRANS_8023) && Not4Flag)	return;
    181 
    182 	idx = 0;
    183 	mopGetHeader(pkt, &idx, &dst, &src, &ptype, &len, trans);
    184 
    185 	/*
    186 	 * Ignore our own transmissions
    187 	 *
    188 	 */
    189 	if (mopCmpEAddr(ii->eaddr,src) == 0)
    190 		return;
    191 
    192 	switch(ptype) {
    193 	case MOP_K_PROTO_DL:
    194 		mopProcessDL(stdout, ii, pkt, &idx, dst, src, trans, len);
    195 		break;
    196 	case MOP_K_PROTO_RC:
    197 		mopProcessRC(stdout, ii, pkt, &idx, dst, src, trans, len);
    198 		break;
    199 	default:
    200 		break;
    201 	}
    202 }
    203