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ifconfig.c revision 1.19 
      1 /*	$NetBSD: ifconfig.c,v 1.19 1995/03/18 14:56:24 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 static char copyright[] =
     38 "@(#) Copyright (c) 1983, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n";
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)ifconfig.c	8.2 (Berkeley) 2/16/94";
     45 #else
     46 static char rcsid[] = "$NetBSD: ifconfig.c,v 1.19 1995/03/18 14:56:24 cgd Exp $";
     47 #endif
     48 #endif /* not lint */
     49 
     50 #include <sys/param.h>
     51 #include <sys/socket.h>
     52 #include <sys/ioctl.h>
     53 
     54 #include <net/if.h>
     55 #include <netinet/in.h>
     56 #include <arpa/inet.h>
     57 
     58 #define	NSIP
     59 #include <netns/ns.h>
     60 #include <netns/ns_if.h>
     61 #include <netdb.h>
     62 
     63 #define EON
     64 #include <netiso/iso.h>
     65 #include <netiso/iso_var.h>
     66 #include <sys/protosw.h>
     67 
     68 #include <ctype.h>
     69 #include <err.h>
     70 #include <errno.h>
     71 #include <stdio.h>
     72 #include <stdlib.h>
     73 #include <string.h>
     74 #include <unistd.h>
     75 
     76 struct	ifreq		ifr, ridreq;
     77 struct	ifaliasreq	addreq;
     78 struct	iso_ifreq	iso_ridreq;
     79 struct	iso_aliasreq	iso_addreq;
     80 struct	sockaddr_in	netmask;
     81 char	name[30];
     82 int	flags, metric, setaddr, setipdst, doalias;
     83 int	clearaddr, s;
     84 int	newaddr = 1;
     85 int	nsellength = 1;
     86 int	af = AF_INET;
     87 
     88 void 	notealias __P((char *, int));
     89 void 	notrailers __P((char *, int));
     90 void 	setifaddr __P((char *, int));
     91 void 	setifdstaddr __P((char *, int));
     92 void 	setifflags __P((char *, int));
     93 void 	setifbroadaddr __P((char *));
     94 void 	setifipdst __P((char *));
     95 void 	setifmetric __P((char *));
     96 void 	setifnetmask __P((char *));
     97 void 	setnsellength __P((char *));
     98 void 	setsnpaoffset __P((char *));
     99 
    100 #define	NEXTARG		0xffffff
    101 
    102 struct	cmd {
    103 	char	*c_name;
    104 	int	c_parameter;		/* NEXTARG means next argv */
    105 	void	(*c_func)();
    106 } cmds[] = {
    107 	{ "up",		IFF_UP,		setifflags } ,
    108 	{ "down",	-IFF_UP,	setifflags },
    109 	{ "trailers",	-1,		notrailers },
    110 	{ "-trailers",	1,		notrailers },
    111 	{ "arp",	-IFF_NOARP,	setifflags },
    112 	{ "-arp",	IFF_NOARP,	setifflags },
    113 	{ "debug",	IFF_DEBUG,	setifflags },
    114 	{ "-debug",	-IFF_DEBUG,	setifflags },
    115 	{ "alias",	IFF_UP,		notealias },
    116 	{ "-alias",	-IFF_UP,	notealias },
    117 	{ "delete",	-IFF_UP,	notealias },
    118 #ifdef notdef
    119 #define	EN_SWABIPS	0x1000
    120 	{ "swabips",	EN_SWABIPS,	setifflags },
    121 	{ "-swabips",	-EN_SWABIPS,	setifflags },
    122 #endif
    123 	{ "netmask",	NEXTARG,	setifnetmask },
    124 	{ "metric",	NEXTARG,	setifmetric },
    125 	{ "broadcast",	NEXTARG,	setifbroadaddr },
    126 	{ "ipdst",	NEXTARG,	setifipdst },
    127 	{ "snpaoffset",	NEXTARG,	setsnpaoffset },
    128 	{ "nsellength",	NEXTARG,	setnsellength },
    129 	{ "link0",	IFF_LINK0,	setifflags } ,
    130 	{ "-link0",	-IFF_LINK0,	setifflags } ,
    131 	{ "link1",	IFF_LINK1,	setifflags } ,
    132 	{ "-link1",	-IFF_LINK1,	setifflags } ,
    133 	{ "link2",	IFF_LINK2,	setifflags } ,
    134 	{ "-link2",	-IFF_LINK2,	setifflags } ,
    135 	{ 0,		0,		setifaddr },
    136 	{ 0,		0,		setifdstaddr },
    137 };
    138 
    139 void 	adjust_nsellength();
    140 int	getinfo __P((struct ifreq *));
    141 void	getsock __P((int));
    142 void	printall __P((void));
    143 void 	printb __P((char *, unsigned short, char *));
    144 void 	status();
    145 void 	usage();
    146 
    147 /*
    148  * XNS support liberally adapted from code written at the University of
    149  * Maryland principally by James O'Toole and Chris Torek.
    150  */
    151 void	in_status __P((int));
    152 void 	in_getaddr __P((char *, int));
    153 void 	xns_status __P((int));
    154 void 	xns_getaddr __P((char *, int));
    155 void 	iso_status __P((int));
    156 void 	iso_getaddr __P((char *, int));
    157 
    158 /* Known address families */
    159 struct afswtch {
    160 	char *af_name;
    161 	short af_af;
    162 	void (*af_status)();
    163 	void (*af_getaddr)();
    164 	u_long af_difaddr;
    165 	u_long af_aifaddr;
    166 	caddr_t af_ridreq;
    167 	caddr_t af_addreq;
    168 } afs[] = {
    169 #define C(x) ((caddr_t) &x)
    170 	{ "inet", AF_INET, in_status, in_getaddr,
    171 	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
    172 	{ "ns", AF_NS, xns_status, xns_getaddr,
    173 	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
    174 	{ "iso", AF_ISO, iso_status, iso_getaddr,
    175 	     SIOCDIFADDR_ISO, SIOCAIFADDR_ISO, C(iso_ridreq), C(iso_addreq) },
    176 	{ 0,	0,	    0,		0 }
    177 };
    178 
    179 struct afswtch *afp;	/*the address family being set or asked about*/
    180 
    181 int
    182 main(argc, argv)
    183 	int argc;
    184 	char *argv[];
    185 {
    186 	register struct afswtch *rafp;
    187 	int aflag = 0;
    188 
    189 	if (argc < 2)
    190 		usage();
    191 	argc--, argv++;
    192 	if (!strcmp(*argv, "-a"))
    193 		aflag = 1;
    194 	else
    195 		strncpy(name, *argv, sizeof(name));
    196 	argc--, argv++;
    197 	if (argc > 0) {
    198 		for (afp = rafp = afs; rafp->af_name; rafp++)
    199 			if (strcmp(rafp->af_name, *argv) == 0) {
    200 				afp = rafp; argc--; argv++;
    201 				break;
    202 			}
    203 		rafp = afp;
    204 		af = ifr.ifr_addr.sa_family = rafp->af_af;
    205 	}
    206 	if (aflag) {
    207 		if (argc > 0)
    208 			usage();
    209 		printall();
    210 		exit(0);
    211 	}
    212 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    213 	if (getinfo(&ifr) < 0)
    214 		exit(1);
    215 	if (argc == 0) {
    216 		status();
    217 		exit(0);
    218 	}
    219 	while (argc > 0) {
    220 		register struct cmd *p;
    221 
    222 		for (p = cmds; p->c_name; p++)
    223 			if (strcmp(*argv, p->c_name) == 0)
    224 				break;
    225 		if (p->c_name == 0 && setaddr)
    226 			p++;	/* got src, do dst */
    227 		if (p->c_func) {
    228 			if (p->c_parameter == NEXTARG) {
    229 				if (argv[1] == NULL)
    230 					errx(1, "'%s' requires argument",
    231 					    p->c_name);
    232 				(*p->c_func)(argv[1]);
    233 				argc--, argv++;
    234 			} else
    235 				(*p->c_func)(*argv, p->c_parameter);
    236 		}
    237 		argc--, argv++;
    238 	}
    239 	if (af == AF_ISO)
    240 		adjust_nsellength();
    241 	if (setipdst && af==AF_NS) {
    242 		struct nsip_req rq;
    243 		int size = sizeof(rq);
    244 
    245 		rq.rq_ns = addreq.ifra_addr;
    246 		rq.rq_ip = addreq.ifra_dstaddr;
    247 
    248 		if (setsockopt(s, 0, SO_NSIP_ROUTE, &rq, size) < 0)
    249 			warn("encapsulation routing");
    250 	}
    251 	if (clearaddr) {
    252 		int ret;
    253 		strncpy(rafp->af_ridreq, name, sizeof ifr.ifr_name);
    254 		if ((ret = ioctl(s, rafp->af_difaddr, rafp->af_ridreq)) < 0) {
    255 			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
    256 				/* means no previous address for interface */
    257 			} else
    258 				warn("SIOCDIFADDR");
    259 		}
    260 	}
    261 	if (newaddr) {
    262 		strncpy(rafp->af_addreq, name, sizeof ifr.ifr_name);
    263 		if (ioctl(s, rafp->af_aifaddr, rafp->af_addreq) < 0)
    264 			warn("SIOCAIFADDR");
    265 	}
    266 	exit(0);
    267 }
    268 
    269 void
    270 getsock(naf)
    271 	int naf;
    272 {
    273 	static int oaf = -1;
    274 
    275 	if (oaf == naf)
    276 		return;
    277 	if (oaf != -1)
    278 		close(s);
    279 	s = socket(naf, SOCK_DGRAM, 0);
    280 	if (s < 0)
    281 		oaf = -1;
    282 	else
    283 		oaf = naf;
    284 }
    285 
    286 int
    287 getinfo(ifr)
    288 	struct ifreq *ifr;
    289 {
    290 
    291 	getsock(af);
    292 	if (s < 0)
    293 		err(1, "socket");
    294 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)ifr) < 0) {
    295 		warn("SIOCGIFFLAGS");
    296 		return (-1);
    297 	}
    298 	flags = ifr->ifr_flags;
    299 	if (ioctl(s, SIOCGIFMETRIC, (caddr_t)ifr) < 0) {
    300 		warn("SIOCGIFMETRIC");
    301 		metric = 0;
    302 	} else
    303 		metric = ifr->ifr_metric;
    304 	return (0);
    305 }
    306 
    307 void
    308 printall()
    309 {
    310 	char inbuf[8192];
    311 	struct ifconf ifc;
    312 	struct ifreq ifreq, *ifr;
    313 	int i;
    314 
    315 	ifc.ifc_len = sizeof(inbuf);
    316 	ifc.ifc_buf = inbuf;
    317 	getsock(af);
    318 	if (s < 0)
    319 		err(1, "socket");
    320 	if (ioctl(s, SIOCGIFCONF, &ifc) < 0)
    321 		err(1, "SIOCGIFCONF");
    322 	ifr = ifc.ifc_req;
    323 	ifreq.ifr_name[0] = '\0';
    324 	for (i = 0; i < ifc.ifc_len; ) {
    325 		ifr = (struct ifreq *)((caddr_t)ifc.ifc_req + i);
    326 		i += sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len;
    327 		if (!strncmp(ifreq.ifr_name, ifr->ifr_name,
    328 			     sizeof(ifr->ifr_name)))
    329 			continue;
    330 		strncpy(name, ifr->ifr_name, sizeof(ifr->ifr_name));
    331 		ifreq = *ifr;
    332 		if (getinfo(&ifreq) < 0)
    333 			continue;
    334 		status();
    335 	}
    336 }
    337 
    338 #define RIDADDR 0
    339 #define ADDR	1
    340 #define MASK	2
    341 #define DSTADDR	3
    342 
    343 /*ARGSUSED*/
    344 void
    345 setifaddr(addr, param)
    346 	char *addr;
    347 	int param;
    348 {
    349 	/*
    350 	 * Delay the ioctl to set the interface addr until flags are all set.
    351 	 * The address interpretation may depend on the flags,
    352 	 * and the flags may change when the address is set.
    353 	 */
    354 	setaddr++;
    355 	if (doalias == 0)
    356 		clearaddr = 1;
    357 	(*afp->af_getaddr)(addr, (doalias >= 0 ? ADDR : RIDADDR));
    358 }
    359 
    360 void
    361 setifnetmask(addr)
    362 	char *addr;
    363 {
    364 	(*afp->af_getaddr)(addr, MASK);
    365 }
    366 
    367 void
    368 setifbroadaddr(addr)
    369 	char *addr;
    370 {
    371 	(*afp->af_getaddr)(addr, DSTADDR);
    372 }
    373 
    374 void
    375 setifipdst(addr)
    376 	char *addr;
    377 {
    378 	in_getaddr(addr, DSTADDR);
    379 	setipdst++;
    380 	clearaddr = 0;
    381 	newaddr = 0;
    382 }
    383 
    384 #define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
    385 /*ARGSUSED*/
    386 void
    387 notealias(addr, param)
    388 	char *addr;
    389 	int param;
    390 {
    391 	if (setaddr && doalias == 0 && param < 0)
    392 		memcpy(rqtosa(af_ridreq),
    393 		       rqtosa(af_addreq),
    394 		       rqtosa(af_addreq)->sa_len);
    395 	doalias = param;
    396 	if (param < 0) {
    397 		clearaddr = 1;
    398 		newaddr = 0;
    399 	} else
    400 		clearaddr = 0;
    401 }
    402 
    403 /*ARGSUSED*/
    404 void
    405 notrailers(vname, value)
    406 	char *vname;
    407 	int value;
    408 {
    409 	printf("Note: trailers are no longer sent, but always received\n");
    410 }
    411 
    412 /*ARGSUSED*/
    413 void
    414 setifdstaddr(addr, param)
    415 	char *addr;
    416 	int param;
    417 {
    418 	(*afp->af_getaddr)(addr, DSTADDR);
    419 }
    420 
    421 void
    422 setifflags(vname, value)
    423 	char *vname;
    424 	int value;
    425 {
    426  	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0)
    427 		err(1, "SIOCGIFFLAGS");
    428 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    429  	flags = ifr.ifr_flags;
    430 
    431 	if (value < 0) {
    432 		value = -value;
    433 		flags &= ~value;
    434 	} else
    435 		flags |= value;
    436 	ifr.ifr_flags = flags;
    437 	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
    438 		err(1, "SIOCSIFFLAGS");
    439 }
    440 
    441 void
    442 setifmetric(val)
    443 	char *val;
    444 {
    445 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    446 	ifr.ifr_metric = atoi(val);
    447 	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
    448 		warn("SIOCSIFMETRIC");
    449 }
    450 
    451 void
    452 setsnpaoffset(val)
    453 	char *val;
    454 {
    455 	iso_addreq.ifra_snpaoffset = atoi(val);
    456 }
    457 
    458 #define	IFFBITS \
    459 "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
    460 \11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2\20MULTICAST"
    461 
    462 /*
    463  * Print the status of the interface.  If an address family was
    464  * specified, show it and it only; otherwise, show them all.
    465  */
    466 void
    467 status()
    468 {
    469 	register struct afswtch *p = afp;
    470 
    471 	printf("%s: ", name);
    472 	printb("flags", flags, IFFBITS);
    473 	if (metric)
    474 		printf(" metric %d", metric);
    475 	putchar('\n');
    476 	if ((p = afp) != NULL) {
    477 		(*p->af_status)(1);
    478 	} else for (p = afs; p->af_name; p++) {
    479 		ifr.ifr_addr.sa_family = p->af_af;
    480 		(*p->af_status)(0);
    481 	}
    482 }
    483 
    484 void
    485 in_status(force)
    486 	int force;
    487 {
    488 	struct sockaddr_in *sin;
    489 	char *inet_ntoa();
    490 
    491 	getsock(AF_INET);
    492 	if (s < 0) {
    493 		if (errno == EPROTONOSUPPORT)
    494 			return;
    495 		err(1, "socket");
    496 	}
    497 	memset(&ifr, 0, sizeof(ifr));
    498 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    499 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
    500 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
    501 			if (!force)
    502 				return;
    503 			memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    504 		} else
    505 			warn("SIOCGIFADDR");
    506 	}
    507 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    508 	sin = (struct sockaddr_in *)&ifr.ifr_addr;
    509 	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
    510 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    511 	if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
    512 		if (errno != EADDRNOTAVAIL)
    513 			warn("SIOCGIFNETMASK");
    514 		memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    515 	} else
    516 		netmask.sin_addr =
    517 		    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
    518 	if (flags & IFF_POINTOPOINT) {
    519 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
    520 			if (errno == EADDRNOTAVAIL)
    521 			    memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    522 			else
    523 			    warn("SIOCGIFDSTADDR");
    524 		}
    525 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    526 		sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
    527 		printf("--> %s ", inet_ntoa(sin->sin_addr));
    528 	}
    529 	printf("netmask 0x%x ", ntohl(netmask.sin_addr.s_addr));
    530 	if (flags & IFF_BROADCAST) {
    531 		if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
    532 			if (errno == EADDRNOTAVAIL)
    533 			    memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    534 			else
    535 			    warn("SIOCGIFBRDADDR");
    536 		}
    537 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    538 		sin = (struct sockaddr_in *)&ifr.ifr_addr;
    539 		if (sin->sin_addr.s_addr != 0)
    540 			printf("broadcast %s", inet_ntoa(sin->sin_addr));
    541 	}
    542 	putchar('\n');
    543 }
    544 
    545 void
    546 xns_status(force)
    547 	int force;
    548 {
    549 	struct sockaddr_ns *sns;
    550 
    551 	getsock(AF_NS);
    552 	if (s < 0) {
    553 		if (errno == EPROTONOSUPPORT)
    554 			return;
    555 		err(1, "socket");
    556 	}
    557 	memset(&ifr, 0, sizeof(ifr));
    558 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    559 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
    560 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
    561 			if (!force)
    562 				return;
    563 			memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    564 		} else
    565 			warn("SIOCGIFADDR");
    566 	}
    567 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
    568 	sns = (struct sockaddr_ns *)&ifr.ifr_addr;
    569 	printf("\tns %s ", ns_ntoa(sns->sns_addr));
    570 	if (flags & IFF_POINTOPOINT) { /* by W. Nesheim@Cornell */
    571 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
    572 			if (errno == EADDRNOTAVAIL)
    573 			    memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    574 			else
    575 			    warn("SIOCGIFDSTADDR");
    576 		}
    577 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    578 		sns = (struct sockaddr_ns *)&ifr.ifr_dstaddr;
    579 		printf("--> %s ", ns_ntoa(sns->sns_addr));
    580 	}
    581 	putchar('\n');
    582 }
    583 
    584 void
    585 iso_status(force)
    586 	int force;
    587 {
    588 	struct sockaddr_iso *siso;
    589 	struct iso_ifreq ifr;
    590 
    591 	getsock(AF_ISO);
    592 	if (s < 0) {
    593 		if (errno == EPROTONOSUPPORT)
    594 			return;
    595 		err(1, "socket");
    596 	}
    597 	memset(&ifr, 0, sizeof(ifr));
    598 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    599 	if (ioctl(s, SIOCGIFADDR_ISO, (caddr_t)&ifr) < 0) {
    600 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
    601 			if (!force)
    602 				return;
    603 			memset(&ifr.ifr_Addr, 0, sizeof(ifr.ifr_Addr));
    604 		} else
    605 			warn("SIOCGIFADDR_ISO");
    606 	}
    607 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
    608 	siso = &ifr.ifr_Addr;
    609 	printf("\tiso %s ", iso_ntoa(&siso->siso_addr));
    610 	if (ioctl(s, SIOCGIFNETMASK_ISO, (caddr_t)&ifr) < 0) {
    611 		if (errno == EADDRNOTAVAIL)
    612 			memset(&ifr.ifr_Addr, 0, sizeof(ifr.ifr_Addr));
    613 		else
    614 			warn("SIOCGIFNETMASK_ISO");
    615 	} else {
    616 		printf(" netmask %s ", iso_ntoa(&siso->siso_addr));
    617 	}
    618 	if (flags & IFF_POINTOPOINT) {
    619 		if (ioctl(s, SIOCGIFDSTADDR_ISO, (caddr_t)&ifr) < 0) {
    620 			if (errno == EADDRNOTAVAIL)
    621 			    memset(&ifr.ifr_Addr, 0, sizeof(ifr.ifr_Addr));
    622 			else
    623 			    warn("SIOCGIFDSTADDR_ISO");
    624 		}
    625 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    626 		siso = &ifr.ifr_Addr;
    627 		printf("--> %s ", iso_ntoa(&siso->siso_addr));
    628 	}
    629 	putchar('\n');
    630 }
    631 
    632 struct	in_addr inet_makeaddr();
    633 
    634 #define SIN(x) ((struct sockaddr_in *) &(x))
    635 struct sockaddr_in *sintab[] = {
    636 SIN(ridreq.ifr_addr), SIN(addreq.ifra_addr),
    637 SIN(addreq.ifra_mask), SIN(addreq.ifra_broadaddr)};
    638 
    639 void
    640 in_getaddr(s, which)
    641 	char *s;
    642 	int which;
    643 {
    644 	register struct sockaddr_in *sin = sintab[which];
    645 	struct hostent *hp;
    646 	struct netent *np;
    647 	int val;
    648 
    649 	sin->sin_len = sizeof(*sin);
    650 	if (which != MASK)
    651 		sin->sin_family = AF_INET;
    652 
    653 	if ((val = inet_addr(s)) != -1)
    654 		sin->sin_addr.s_addr = val;
    655 	else if (hp = gethostbyname(s))
    656 		memcpy(&sin->sin_addr, hp->h_addr, hp->h_length);
    657 	else if (np = getnetbyname(s))
    658 		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
    659 	else
    660 		errx(1, "%s: bad value", s);
    661 }
    662 
    663 /*
    664  * Print a value a la the %b format of the kernel's printf
    665  */
    666 void
    667 printb(s, v, bits)
    668 	char *s;
    669 	register char *bits;
    670 	register unsigned short v;
    671 {
    672 	register int i, any = 0;
    673 	register char c;
    674 
    675 	if (bits && *bits == 8)
    676 		printf("%s=%o", s, v);
    677 	else
    678 		printf("%s=%x", s, v);
    679 	bits++;
    680 	if (bits) {
    681 		putchar('<');
    682 		while (i = *bits++) {
    683 			if (v & (1 << (i-1))) {
    684 				if (any)
    685 					putchar(',');
    686 				any = 1;
    687 				for (; (c = *bits) > 32; bits++)
    688 					putchar(c);
    689 			} else
    690 				for (; *bits > 32; bits++)
    691 					;
    692 		}
    693 		putchar('>');
    694 	}
    695 }
    696 
    697 #define SNS(x) ((struct sockaddr_ns *) &(x))
    698 struct sockaddr_ns *snstab[] = {
    699 SNS(ridreq.ifr_addr), SNS(addreq.ifra_addr),
    700 SNS(addreq.ifra_mask), SNS(addreq.ifra_broadaddr)};
    701 
    702 void
    703 xns_getaddr(addr, which)
    704 	char *addr;
    705 	int which;
    706 {
    707 	struct sockaddr_ns *sns = snstab[which];
    708 	struct ns_addr ns_addr();
    709 
    710 	sns->sns_family = AF_NS;
    711 	sns->sns_len = sizeof(*sns);
    712 	sns->sns_addr = ns_addr(addr);
    713 	if (which == MASK)
    714 		printf("Attempt to set XNS netmask will be ineffectual\n");
    715 }
    716 
    717 #define SISO(x) ((struct sockaddr_iso *) &(x))
    718 struct sockaddr_iso *sisotab[] = {
    719 SISO(iso_ridreq.ifr_Addr), SISO(iso_addreq.ifra_addr),
    720 SISO(iso_addreq.ifra_mask), SISO(iso_addreq.ifra_dstaddr)};
    721 
    722 void
    723 iso_getaddr(addr, which)
    724 	char *addr;
    725 	int which;
    726 {
    727 	register struct sockaddr_iso *siso = sisotab[which];
    728 	struct iso_addr *iso_addr();
    729 	siso->siso_addr = *iso_addr(addr);
    730 
    731 	if (which == MASK) {
    732 		siso->siso_len = TSEL(siso) - (caddr_t)(siso);
    733 		siso->siso_nlen = 0;
    734 	} else {
    735 		siso->siso_len = sizeof(*siso);
    736 		siso->siso_family = AF_ISO;
    737 	}
    738 }
    739 
    740 void
    741 setnsellength(val)
    742 	char *val;
    743 {
    744 	nsellength = atoi(val);
    745 	if (nsellength < 0)
    746 		errx(1, "Negative NSEL length is absurd");
    747 	if (afp == 0 || afp->af_af != AF_ISO)
    748 		errx(1, "Setting NSEL length valid only for iso");
    749 }
    750 
    751 void
    752 fixnsel(s)
    753 	register struct sockaddr_iso *s;
    754 {
    755 	if (s->siso_family == 0)
    756 		return;
    757 	s->siso_tlen = nsellength;
    758 }
    759 
    760 void
    761 adjust_nsellength()
    762 {
    763 	fixnsel(sisotab[RIDADDR]);
    764 	fixnsel(sisotab[ADDR]);
    765 	fixnsel(sisotab[DSTADDR]);
    766 }
    767 
    768 void
    769 usage()
    770 {
    771 	fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s%s",
    772 		"\t[ af [ address [ dest_addr ] ] [ up ] [ down ] ",
    773 		"[ netmask mask ] ]\n",
    774 		"\t[ metric n ]\n",
    775 		"\t[ arp | -arp ]\n",
    776 		"\t[ link0 | -link0 ] [ link1 | -link1 ] [ link2 | -link2 ]\n",
    777 		"       ifconfig -a [ af ]\n");
    778 	exit(1);
    779 }
    780