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ifconfig.c revision 1.21 
      1 /*	$NetBSD: ifconfig.c,v 1.21 1995/10/08 23:03:54 gwr 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 1.21 1995/10/08 23:03:54 gwr 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 #ifndef INET_ONLY
    128 	{ "snpaoffset",	NEXTARG,	setsnpaoffset },
    129 	{ "nsellength",	NEXTARG,	setnsellength },
    130 #endif	/* INET_ONLY */
    131 	{ "link0",	IFF_LINK0,	setifflags } ,
    132 	{ "-link0",	-IFF_LINK0,	setifflags } ,
    133 	{ "link1",	IFF_LINK1,	setifflags } ,
    134 	{ "-link1",	-IFF_LINK1,	setifflags } ,
    135 	{ "link2",	IFF_LINK2,	setifflags } ,
    136 	{ "-link2",	-IFF_LINK2,	setifflags } ,
    137 	{ 0,		0,		setifaddr },
    138 	{ 0,		0,		setifdstaddr },
    139 };
    140 
    141 void 	adjust_nsellength();
    142 int	getinfo __P((struct ifreq *));
    143 void	getsock __P((int));
    144 void	printall __P((void));
    145 void 	printb __P((char *, unsigned short, char *));
    146 void 	status();
    147 void 	usage();
    148 
    149 /*
    150  * XNS support liberally adapted from code written at the University of
    151  * Maryland principally by James O'Toole and Chris Torek.
    152  */
    153 void	in_status __P((int));
    154 void 	in_getaddr __P((char *, int));
    155 void 	xns_status __P((int));
    156 void 	xns_getaddr __P((char *, int));
    157 void 	iso_status __P((int));
    158 void 	iso_getaddr __P((char *, int));
    159 
    160 /* Known address families */
    161 struct afswtch {
    162 	char *af_name;
    163 	short af_af;
    164 	void (*af_status)();
    165 	void (*af_getaddr)();
    166 	u_long af_difaddr;
    167 	u_long af_aifaddr;
    168 	caddr_t af_ridreq;
    169 	caddr_t af_addreq;
    170 } afs[] = {
    171 #define C(x) ((caddr_t) &x)
    172 	{ "inet", AF_INET, in_status, in_getaddr,
    173 	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
    174 #ifndef INET_ONLY	/* small version, for boot media */
    175 	{ "ns", AF_NS, xns_status, xns_getaddr,
    176 	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
    177 	{ "iso", AF_ISO, iso_status, iso_getaddr,
    178 	     SIOCDIFADDR_ISO, SIOCAIFADDR_ISO, C(iso_ridreq), C(iso_addreq) },
    179 #endif	/* INET_ONLY */
    180 	{ 0,	0,	    0,		0 }
    181 };
    182 
    183 struct afswtch *afp;	/*the address family being set or asked about*/
    184 
    185 int
    186 main(argc, argv)
    187 	int argc;
    188 	char *argv[];
    189 {
    190 	register struct afswtch *rafp;
    191 	int aflag = 0;
    192 
    193 	if (argc < 2)
    194 		usage();
    195 	argc--, argv++;
    196 	if (!strcmp(*argv, "-a"))
    197 		aflag = 1;
    198 	else
    199 		strncpy(name, *argv, sizeof(name));
    200 	argc--, argv++;
    201 	if (argc > 0) {
    202 		for (afp = rafp = afs; rafp->af_name; rafp++)
    203 			if (strcmp(rafp->af_name, *argv) == 0) {
    204 				afp = rafp; argc--; argv++;
    205 				break;
    206 			}
    207 		rafp = afp;
    208 		af = ifr.ifr_addr.sa_family = rafp->af_af;
    209 	}
    210 	if (aflag) {
    211 		if (argc > 0)
    212 			usage();
    213 		printall();
    214 		exit(0);
    215 	}
    216 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    217 	if (getinfo(&ifr) < 0)
    218 		exit(1);
    219 	if (argc == 0) {
    220 		status();
    221 		exit(0);
    222 	}
    223 	while (argc > 0) {
    224 		register struct cmd *p;
    225 
    226 		for (p = cmds; p->c_name; p++)
    227 			if (strcmp(*argv, p->c_name) == 0)
    228 				break;
    229 		if (p->c_name == 0 && setaddr)
    230 			p++;	/* got src, do dst */
    231 		if (p->c_func) {
    232 			if (p->c_parameter == NEXTARG) {
    233 				if (argv[1] == NULL)
    234 					errx(1, "'%s' requires argument",
    235 					    p->c_name);
    236 				(*p->c_func)(argv[1]);
    237 				argc--, argv++;
    238 			} else
    239 				(*p->c_func)(*argv, p->c_parameter);
    240 		}
    241 		argc--, argv++;
    242 	}
    243 
    244 #ifndef INET_ONLY
    245 
    246 	if (af == AF_ISO)
    247 		adjust_nsellength();
    248 	if (setipdst && af==AF_NS) {
    249 		struct nsip_req rq;
    250 		int size = sizeof(rq);
    251 
    252 		rq.rq_ns = addreq.ifra_addr;
    253 		rq.rq_ip = addreq.ifra_dstaddr;
    254 
    255 		if (setsockopt(s, 0, SO_NSIP_ROUTE, &rq, size) < 0)
    256 			warn("encapsulation routing");
    257 	}
    258 
    259 #endif	/* INET_ONLY */
    260 
    261 	if (clearaddr) {
    262 		int ret;
    263 		strncpy(rafp->af_ridreq, name, sizeof ifr.ifr_name);
    264 		if ((ret = ioctl(s, rafp->af_difaddr, rafp->af_ridreq)) < 0) {
    265 			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
    266 				/* means no previous address for interface */
    267 			} else
    268 				warn("SIOCDIFADDR");
    269 		}
    270 	}
    271 	if (newaddr) {
    272 		strncpy(rafp->af_addreq, name, sizeof ifr.ifr_name);
    273 		if (ioctl(s, rafp->af_aifaddr, rafp->af_addreq) < 0)
    274 			warn("SIOCAIFADDR");
    275 	}
    276 	exit(0);
    277 }
    278 
    279 void
    280 getsock(naf)
    281 	int naf;
    282 {
    283 	static int oaf = -1;
    284 
    285 	if (oaf == naf)
    286 		return;
    287 	if (oaf != -1)
    288 		close(s);
    289 	s = socket(naf, SOCK_DGRAM, 0);
    290 	if (s < 0)
    291 		oaf = -1;
    292 	else
    293 		oaf = naf;
    294 }
    295 
    296 int
    297 getinfo(ifr)
    298 	struct ifreq *ifr;
    299 {
    300 
    301 	getsock(af);
    302 	if (s < 0)
    303 		err(1, "socket");
    304 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)ifr) < 0) {
    305 		warn("SIOCGIFFLAGS");
    306 		return (-1);
    307 	}
    308 	flags = ifr->ifr_flags;
    309 	if (ioctl(s, SIOCGIFMETRIC, (caddr_t)ifr) < 0) {
    310 		warn("SIOCGIFMETRIC");
    311 		metric = 0;
    312 	} else
    313 		metric = ifr->ifr_metric;
    314 	return (0);
    315 }
    316 
    317 void
    318 printall()
    319 {
    320 	char inbuf[8192];
    321 	struct ifconf ifc;
    322 	struct ifreq ifreq, *ifr;
    323 	int i;
    324 
    325 	ifc.ifc_len = sizeof(inbuf);
    326 	ifc.ifc_buf = inbuf;
    327 	getsock(af);
    328 	if (s < 0)
    329 		err(1, "socket");
    330 	if (ioctl(s, SIOCGIFCONF, &ifc) < 0)
    331 		err(1, "SIOCGIFCONF");
    332 	ifr = ifc.ifc_req;
    333 	ifreq.ifr_name[0] = '\0';
    334 	for (i = 0; i < ifc.ifc_len; ) {
    335 		ifr = (struct ifreq *)((caddr_t)ifc.ifc_req + i);
    336 		i += sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len;
    337 		if (!strncmp(ifreq.ifr_name, ifr->ifr_name,
    338 			     sizeof(ifr->ifr_name)))
    339 			continue;
    340 		strncpy(name, ifr->ifr_name, sizeof(ifr->ifr_name));
    341 		ifreq = *ifr;
    342 		if (getinfo(&ifreq) < 0)
    343 			continue;
    344 		status();
    345 	}
    346 }
    347 
    348 #define RIDADDR 0
    349 #define ADDR	1
    350 #define MASK	2
    351 #define DSTADDR	3
    352 
    353 /*ARGSUSED*/
    354 void
    355 setifaddr(addr, param)
    356 	char *addr;
    357 	int param;
    358 {
    359 	/*
    360 	 * Delay the ioctl to set the interface addr until flags are all set.
    361 	 * The address interpretation may depend on the flags,
    362 	 * and the flags may change when the address is set.
    363 	 */
    364 	setaddr++;
    365 	if (doalias == 0)
    366 		clearaddr = 1;
    367 	(*afp->af_getaddr)(addr, (doalias >= 0 ? ADDR : RIDADDR));
    368 }
    369 
    370 void
    371 setifnetmask(addr)
    372 	char *addr;
    373 {
    374 	(*afp->af_getaddr)(addr, MASK);
    375 }
    376 
    377 void
    378 setifbroadaddr(addr)
    379 	char *addr;
    380 {
    381 	(*afp->af_getaddr)(addr, DSTADDR);
    382 }
    383 
    384 void
    385 setifipdst(addr)
    386 	char *addr;
    387 {
    388 	in_getaddr(addr, DSTADDR);
    389 	setipdst++;
    390 	clearaddr = 0;
    391 	newaddr = 0;
    392 }
    393 
    394 #define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
    395 /*ARGSUSED*/
    396 void
    397 notealias(addr, param)
    398 	char *addr;
    399 	int param;
    400 {
    401 	if (setaddr && doalias == 0 && param < 0)
    402 		memcpy(rqtosa(af_ridreq),
    403 		       rqtosa(af_addreq),
    404 		       rqtosa(af_addreq)->sa_len);
    405 	doalias = param;
    406 	if (param < 0) {
    407 		clearaddr = 1;
    408 		newaddr = 0;
    409 	} else
    410 		clearaddr = 0;
    411 }
    412 
    413 /*ARGSUSED*/
    414 void
    415 notrailers(vname, value)
    416 	char *vname;
    417 	int value;
    418 {
    419 	printf("Note: trailers are no longer sent, but always received\n");
    420 }
    421 
    422 /*ARGSUSED*/
    423 void
    424 setifdstaddr(addr, param)
    425 	char *addr;
    426 	int param;
    427 {
    428 	(*afp->af_getaddr)(addr, DSTADDR);
    429 }
    430 
    431 void
    432 setifflags(vname, value)
    433 	char *vname;
    434 	int value;
    435 {
    436  	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0)
    437 		err(1, "SIOCGIFFLAGS");
    438 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    439  	flags = ifr.ifr_flags;
    440 
    441 	if (value < 0) {
    442 		value = -value;
    443 		flags &= ~value;
    444 	} else
    445 		flags |= value;
    446 	ifr.ifr_flags = flags;
    447 	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
    448 		err(1, "SIOCSIFFLAGS");
    449 }
    450 
    451 void
    452 setifmetric(val)
    453 	char *val;
    454 {
    455 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    456 	ifr.ifr_metric = atoi(val);
    457 	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
    458 		warn("SIOCSIFMETRIC");
    459 }
    460 
    461 #define	IFFBITS \
    462 "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
    463 \11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2\20MULTICAST"
    464 
    465 /*
    466  * Print the status of the interface.  If an address family was
    467  * specified, show it and it only; otherwise, show them all.
    468  */
    469 void
    470 status()
    471 {
    472 	register struct afswtch *p = afp;
    473 
    474 	printf("%s: ", name);
    475 	printb("flags", flags, IFFBITS);
    476 	if (metric)
    477 		printf(" metric %d", metric);
    478 	putchar('\n');
    479 	if ((p = afp) != NULL) {
    480 		(*p->af_status)(1);
    481 	} else for (p = afs; p->af_name; p++) {
    482 		ifr.ifr_addr.sa_family = p->af_af;
    483 		(*p->af_status)(0);
    484 	}
    485 }
    486 
    487 void
    488 in_status(force)
    489 	int force;
    490 {
    491 	struct sockaddr_in *sin;
    492 	char *inet_ntoa();
    493 
    494 	getsock(AF_INET);
    495 	if (s < 0) {
    496 		if (errno == EPROTONOSUPPORT)
    497 			return;
    498 		err(1, "socket");
    499 	}
    500 	memset(&ifr, 0, sizeof(ifr));
    501 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    502 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
    503 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
    504 			if (!force)
    505 				return;
    506 			memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    507 		} else
    508 			warn("SIOCGIFADDR");
    509 	}
    510 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    511 	sin = (struct sockaddr_in *)&ifr.ifr_addr;
    512 	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
    513 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    514 	if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
    515 		if (errno != EADDRNOTAVAIL)
    516 			warn("SIOCGIFNETMASK");
    517 		memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    518 	} else
    519 		netmask.sin_addr =
    520 		    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
    521 	if (flags & IFF_POINTOPOINT) {
    522 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
    523 			if (errno == EADDRNOTAVAIL)
    524 			    memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    525 			else
    526 			    warn("SIOCGIFDSTADDR");
    527 		}
    528 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    529 		sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
    530 		printf("--> %s ", inet_ntoa(sin->sin_addr));
    531 	}
    532 	printf("netmask 0x%x ", ntohl(netmask.sin_addr.s_addr));
    533 	if (flags & IFF_BROADCAST) {
    534 		if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
    535 			if (errno == EADDRNOTAVAIL)
    536 			    memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    537 			else
    538 			    warn("SIOCGIFBRDADDR");
    539 		}
    540 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    541 		sin = (struct sockaddr_in *)&ifr.ifr_addr;
    542 		if (sin->sin_addr.s_addr != 0)
    543 			printf("broadcast %s", inet_ntoa(sin->sin_addr));
    544 	}
    545 	putchar('\n');
    546 }
    547 
    548 #ifndef INET_ONLY
    549 
    550 void
    551 xns_status(force)
    552 	int force;
    553 {
    554 	struct sockaddr_ns *sns;
    555 
    556 	getsock(AF_NS);
    557 	if (s < 0) {
    558 		if (errno == EPROTONOSUPPORT)
    559 			return;
    560 		err(1, "socket");
    561 	}
    562 	memset(&ifr, 0, sizeof(ifr));
    563 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    564 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
    565 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
    566 			if (!force)
    567 				return;
    568 			memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    569 		} else
    570 			warn("SIOCGIFADDR");
    571 	}
    572 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
    573 	sns = (struct sockaddr_ns *)&ifr.ifr_addr;
    574 	printf("\tns %s ", ns_ntoa(sns->sns_addr));
    575 	if (flags & IFF_POINTOPOINT) { /* by W. Nesheim@Cornell */
    576 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
    577 			if (errno == EADDRNOTAVAIL)
    578 			    memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    579 			else
    580 			    warn("SIOCGIFDSTADDR");
    581 		}
    582 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    583 		sns = (struct sockaddr_ns *)&ifr.ifr_dstaddr;
    584 		printf("--> %s ", ns_ntoa(sns->sns_addr));
    585 	}
    586 	putchar('\n');
    587 }
    588 
    589 void
    590 iso_status(force)
    591 	int force;
    592 {
    593 	struct sockaddr_iso *siso;
    594 	struct iso_ifreq ifr;
    595 
    596 	getsock(AF_ISO);
    597 	if (s < 0) {
    598 		if (errno == EPROTONOSUPPORT)
    599 			return;
    600 		err(1, "socket");
    601 	}
    602 	memset(&ifr, 0, sizeof(ifr));
    603 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    604 	if (ioctl(s, SIOCGIFADDR_ISO, (caddr_t)&ifr) < 0) {
    605 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
    606 			if (!force)
    607 				return;
    608 			memset(&ifr.ifr_Addr, 0, sizeof(ifr.ifr_Addr));
    609 		} else
    610 			warn("SIOCGIFADDR_ISO");
    611 	}
    612 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
    613 	siso = &ifr.ifr_Addr;
    614 	printf("\tiso %s ", iso_ntoa(&siso->siso_addr));
    615 	if (ioctl(s, SIOCGIFNETMASK_ISO, (caddr_t)&ifr) < 0) {
    616 		if (errno == EADDRNOTAVAIL)
    617 			memset(&ifr.ifr_Addr, 0, sizeof(ifr.ifr_Addr));
    618 		else
    619 			warn("SIOCGIFNETMASK_ISO");
    620 	} else {
    621 		printf(" netmask %s ", iso_ntoa(&siso->siso_addr));
    622 	}
    623 	if (flags & IFF_POINTOPOINT) {
    624 		if (ioctl(s, SIOCGIFDSTADDR_ISO, (caddr_t)&ifr) < 0) {
    625 			if (errno == EADDRNOTAVAIL)
    626 			    memset(&ifr.ifr_Addr, 0, sizeof(ifr.ifr_Addr));
    627 			else
    628 			    warn("SIOCGIFDSTADDR_ISO");
    629 		}
    630 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    631 		siso = &ifr.ifr_Addr;
    632 		printf("--> %s ", iso_ntoa(&siso->siso_addr));
    633 	}
    634 	putchar('\n');
    635 }
    636 
    637 #endif	/* INET_ONLY */
    638 
    639 struct	in_addr inet_makeaddr();
    640 
    641 #define SIN(x) ((struct sockaddr_in *) &(x))
    642 struct sockaddr_in *sintab[] = {
    643 SIN(ridreq.ifr_addr), SIN(addreq.ifra_addr),
    644 SIN(addreq.ifra_mask), SIN(addreq.ifra_broadaddr)};
    645 
    646 void
    647 in_getaddr(s, which)
    648 	char *s;
    649 	int which;
    650 {
    651 	register struct sockaddr_in *sin = sintab[which];
    652 	struct hostent *hp;
    653 	struct netent *np;
    654 
    655 	sin->sin_len = sizeof(*sin);
    656 	if (which != MASK)
    657 		sin->sin_family = AF_INET;
    658 
    659 	if (inet_aton(s, &sin->sin_addr) == 0) {
    660 		if (hp = gethostbyname(s))
    661 			memcpy(&sin->sin_addr, hp->h_addr, hp->h_length);
    662 		else if (np = getnetbyname(s))
    663 			sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
    664 		else
    665 			errx(1, "%s: bad value", s);
    666 	}
    667 }
    668 
    669 /*
    670  * Print a value a la the %b format of the kernel's printf
    671  */
    672 void
    673 printb(s, v, bits)
    674 	char *s;
    675 	register char *bits;
    676 	register unsigned short v;
    677 {
    678 	register int i, any = 0;
    679 	register char c;
    680 
    681 	if (bits && *bits == 8)
    682 		printf("%s=%o", s, v);
    683 	else
    684 		printf("%s=%x", s, v);
    685 	bits++;
    686 	if (bits) {
    687 		putchar('<');
    688 		while (i = *bits++) {
    689 			if (v & (1 << (i-1))) {
    690 				if (any)
    691 					putchar(',');
    692 				any = 1;
    693 				for (; (c = *bits) > 32; bits++)
    694 					putchar(c);
    695 			} else
    696 				for (; *bits > 32; bits++)
    697 					;
    698 		}
    699 		putchar('>');
    700 	}
    701 }
    702 
    703 #ifndef INET_ONLY
    704 
    705 #define SNS(x) ((struct sockaddr_ns *) &(x))
    706 struct sockaddr_ns *snstab[] = {
    707 SNS(ridreq.ifr_addr), SNS(addreq.ifra_addr),
    708 SNS(addreq.ifra_mask), SNS(addreq.ifra_broadaddr)};
    709 
    710 void
    711 xns_getaddr(addr, which)
    712 	char *addr;
    713 	int which;
    714 {
    715 	struct sockaddr_ns *sns = snstab[which];
    716 	struct ns_addr ns_addr();
    717 
    718 	sns->sns_family = AF_NS;
    719 	sns->sns_len = sizeof(*sns);
    720 	sns->sns_addr = ns_addr(addr);
    721 	if (which == MASK)
    722 		printf("Attempt to set XNS netmask will be ineffectual\n");
    723 }
    724 
    725 #define SISO(x) ((struct sockaddr_iso *) &(x))
    726 struct sockaddr_iso *sisotab[] = {
    727 SISO(iso_ridreq.ifr_Addr), SISO(iso_addreq.ifra_addr),
    728 SISO(iso_addreq.ifra_mask), SISO(iso_addreq.ifra_dstaddr)};
    729 
    730 void
    731 iso_getaddr(addr, which)
    732 	char *addr;
    733 	int which;
    734 {
    735 	register struct sockaddr_iso *siso = sisotab[which];
    736 	struct iso_addr *iso_addr();
    737 	siso->siso_addr = *iso_addr(addr);
    738 
    739 	if (which == MASK) {
    740 		siso->siso_len = TSEL(siso) - (caddr_t)(siso);
    741 		siso->siso_nlen = 0;
    742 	} else {
    743 		siso->siso_len = sizeof(*siso);
    744 		siso->siso_family = AF_ISO;
    745 	}
    746 }
    747 
    748 void
    749 setsnpaoffset(val)
    750 	char *val;
    751 {
    752 	iso_addreq.ifra_snpaoffset = atoi(val);
    753 }
    754 
    755 void
    756 setnsellength(val)
    757 	char *val;
    758 {
    759 	nsellength = atoi(val);
    760 	if (nsellength < 0)
    761 		errx(1, "Negative NSEL length is absurd");
    762 	if (afp == 0 || afp->af_af != AF_ISO)
    763 		errx(1, "Setting NSEL length valid only for iso");
    764 }
    765 
    766 void
    767 fixnsel(s)
    768 	register struct sockaddr_iso *s;
    769 {
    770 	if (s->siso_family == 0)
    771 		return;
    772 	s->siso_tlen = nsellength;
    773 }
    774 
    775 void
    776 adjust_nsellength()
    777 {
    778 	fixnsel(sisotab[RIDADDR]);
    779 	fixnsel(sisotab[ADDR]);
    780 	fixnsel(sisotab[DSTADDR]);
    781 }
    782 
    783 #endif	/* INET_ONLY */
    784 
    785 void
    786 usage()
    787 {
    788 	fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s%s",
    789 		"\t[ af [ address [ dest_addr ] ] [ up ] [ down ] ",
    790 		"[ netmask mask ] ]\n",
    791 		"\t[ metric n ]\n",
    792 		"\t[ arp | -arp ]\n",
    793 		"\t[ link0 | -link0 ] [ link1 | -link1 ] [ link2 | -link2 ]\n",
    794 		"       ifconfig -a [ af ]\n");
    795 	exit(1);
    796 }
    797