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ifconfig.c revision 1.22 
      1 /*	$NetBSD: ifconfig.c,v 1.22 1996/01/04 20:11:20 pk 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 1.22 1996/01/04 20:11:20 pk 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) +
    337 			(ifr->ifr_addr.sa_len > sizeof(struct sockaddr)
    338 				? ifr->ifr_addr.sa_len
    339 				: sizeof(struct sockaddr));
    340 		if (!strncmp(ifreq.ifr_name, ifr->ifr_name,
    341 			     sizeof(ifr->ifr_name)))
    342 			continue;
    343 		strncpy(name, ifr->ifr_name, sizeof(ifr->ifr_name));
    344 		ifreq = *ifr;
    345 		if (getinfo(&ifreq) < 0)
    346 			continue;
    347 		status();
    348 	}
    349 }
    350 
    351 #define RIDADDR 0
    352 #define ADDR	1
    353 #define MASK	2
    354 #define DSTADDR	3
    355 
    356 /*ARGSUSED*/
    357 void
    358 setifaddr(addr, param)
    359 	char *addr;
    360 	int param;
    361 {
    362 	/*
    363 	 * Delay the ioctl to set the interface addr until flags are all set.
    364 	 * The address interpretation may depend on the flags,
    365 	 * and the flags may change when the address is set.
    366 	 */
    367 	setaddr++;
    368 	if (doalias == 0)
    369 		clearaddr = 1;
    370 	(*afp->af_getaddr)(addr, (doalias >= 0 ? ADDR : RIDADDR));
    371 }
    372 
    373 void
    374 setifnetmask(addr)
    375 	char *addr;
    376 {
    377 	(*afp->af_getaddr)(addr, MASK);
    378 }
    379 
    380 void
    381 setifbroadaddr(addr)
    382 	char *addr;
    383 {
    384 	(*afp->af_getaddr)(addr, DSTADDR);
    385 }
    386 
    387 void
    388 setifipdst(addr)
    389 	char *addr;
    390 {
    391 	in_getaddr(addr, DSTADDR);
    392 	setipdst++;
    393 	clearaddr = 0;
    394 	newaddr = 0;
    395 }
    396 
    397 #define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
    398 /*ARGSUSED*/
    399 void
    400 notealias(addr, param)
    401 	char *addr;
    402 	int param;
    403 {
    404 	if (setaddr && doalias == 0 && param < 0)
    405 		memcpy(rqtosa(af_ridreq),
    406 		       rqtosa(af_addreq),
    407 		       rqtosa(af_addreq)->sa_len);
    408 	doalias = param;
    409 	if (param < 0) {
    410 		clearaddr = 1;
    411 		newaddr = 0;
    412 	} else
    413 		clearaddr = 0;
    414 }
    415 
    416 /*ARGSUSED*/
    417 void
    418 notrailers(vname, value)
    419 	char *vname;
    420 	int value;
    421 {
    422 	printf("Note: trailers are no longer sent, but always received\n");
    423 }
    424 
    425 /*ARGSUSED*/
    426 void
    427 setifdstaddr(addr, param)
    428 	char *addr;
    429 	int param;
    430 {
    431 	(*afp->af_getaddr)(addr, DSTADDR);
    432 }
    433 
    434 void
    435 setifflags(vname, value)
    436 	char *vname;
    437 	int value;
    438 {
    439  	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0)
    440 		err(1, "SIOCGIFFLAGS");
    441 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    442  	flags = ifr.ifr_flags;
    443 
    444 	if (value < 0) {
    445 		value = -value;
    446 		flags &= ~value;
    447 	} else
    448 		flags |= value;
    449 	ifr.ifr_flags = flags;
    450 	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
    451 		err(1, "SIOCSIFFLAGS");
    452 }
    453 
    454 void
    455 setifmetric(val)
    456 	char *val;
    457 {
    458 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    459 	ifr.ifr_metric = atoi(val);
    460 	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
    461 		warn("SIOCSIFMETRIC");
    462 }
    463 
    464 #define	IFFBITS \
    465 "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
    466 \11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2\20MULTICAST"
    467 
    468 /*
    469  * Print the status of the interface.  If an address family was
    470  * specified, show it and it only; otherwise, show them all.
    471  */
    472 void
    473 status()
    474 {
    475 	register struct afswtch *p = afp;
    476 
    477 	printf("%s: ", name);
    478 	printb("flags", flags, IFFBITS);
    479 	if (metric)
    480 		printf(" metric %d", metric);
    481 	putchar('\n');
    482 	if ((p = afp) != NULL) {
    483 		(*p->af_status)(1);
    484 	} else for (p = afs; p->af_name; p++) {
    485 		ifr.ifr_addr.sa_family = p->af_af;
    486 		(*p->af_status)(0);
    487 	}
    488 }
    489 
    490 void
    491 in_status(force)
    492 	int force;
    493 {
    494 	struct sockaddr_in *sin;
    495 	char *inet_ntoa();
    496 
    497 	getsock(AF_INET);
    498 	if (s < 0) {
    499 		if (errno == EPROTONOSUPPORT)
    500 			return;
    501 		err(1, "socket");
    502 	}
    503 	memset(&ifr, 0, sizeof(ifr));
    504 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    505 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
    506 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
    507 			if (!force)
    508 				return;
    509 			memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    510 		} else
    511 			warn("SIOCGIFADDR");
    512 	}
    513 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    514 	sin = (struct sockaddr_in *)&ifr.ifr_addr;
    515 	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
    516 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    517 	if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
    518 		if (errno != EADDRNOTAVAIL)
    519 			warn("SIOCGIFNETMASK");
    520 		memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    521 	} else
    522 		netmask.sin_addr =
    523 		    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
    524 	if (flags & IFF_POINTOPOINT) {
    525 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
    526 			if (errno == EADDRNOTAVAIL)
    527 			    memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    528 			else
    529 			    warn("SIOCGIFDSTADDR");
    530 		}
    531 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    532 		sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
    533 		printf("--> %s ", inet_ntoa(sin->sin_addr));
    534 	}
    535 	printf("netmask 0x%x ", ntohl(netmask.sin_addr.s_addr));
    536 	if (flags & IFF_BROADCAST) {
    537 		if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
    538 			if (errno == EADDRNOTAVAIL)
    539 			    memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    540 			else
    541 			    warn("SIOCGIFBRDADDR");
    542 		}
    543 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    544 		sin = (struct sockaddr_in *)&ifr.ifr_addr;
    545 		if (sin->sin_addr.s_addr != 0)
    546 			printf("broadcast %s", inet_ntoa(sin->sin_addr));
    547 	}
    548 	putchar('\n');
    549 }
    550 
    551 #ifndef INET_ONLY
    552 
    553 void
    554 xns_status(force)
    555 	int force;
    556 {
    557 	struct sockaddr_ns *sns;
    558 
    559 	getsock(AF_NS);
    560 	if (s < 0) {
    561 		if (errno == EPROTONOSUPPORT)
    562 			return;
    563 		err(1, "socket");
    564 	}
    565 	memset(&ifr, 0, sizeof(ifr));
    566 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    567 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
    568 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
    569 			if (!force)
    570 				return;
    571 			memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    572 		} else
    573 			warn("SIOCGIFADDR");
    574 	}
    575 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
    576 	sns = (struct sockaddr_ns *)&ifr.ifr_addr;
    577 	printf("\tns %s ", ns_ntoa(sns->sns_addr));
    578 	if (flags & IFF_POINTOPOINT) { /* by W. Nesheim@Cornell */
    579 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
    580 			if (errno == EADDRNOTAVAIL)
    581 			    memset(&ifr.ifr_addr, 0, sizeof(ifr.ifr_addr));
    582 			else
    583 			    warn("SIOCGIFDSTADDR");
    584 		}
    585 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    586 		sns = (struct sockaddr_ns *)&ifr.ifr_dstaddr;
    587 		printf("--> %s ", ns_ntoa(sns->sns_addr));
    588 	}
    589 	putchar('\n');
    590 }
    591 
    592 void
    593 iso_status(force)
    594 	int force;
    595 {
    596 	struct sockaddr_iso *siso;
    597 	struct iso_ifreq ifr;
    598 
    599 	getsock(AF_ISO);
    600 	if (s < 0) {
    601 		if (errno == EPROTONOSUPPORT)
    602 			return;
    603 		err(1, "socket");
    604 	}
    605 	memset(&ifr, 0, sizeof(ifr));
    606 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
    607 	if (ioctl(s, SIOCGIFADDR_ISO, (caddr_t)&ifr) < 0) {
    608 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
    609 			if (!force)
    610 				return;
    611 			memset(&ifr.ifr_Addr, 0, sizeof(ifr.ifr_Addr));
    612 		} else
    613 			warn("SIOCGIFADDR_ISO");
    614 	}
    615 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
    616 	siso = &ifr.ifr_Addr;
    617 	printf("\tiso %s ", iso_ntoa(&siso->siso_addr));
    618 	if (ioctl(s, SIOCGIFNETMASK_ISO, (caddr_t)&ifr) < 0) {
    619 		if (errno == EADDRNOTAVAIL)
    620 			memset(&ifr.ifr_Addr, 0, sizeof(ifr.ifr_Addr));
    621 		else
    622 			warn("SIOCGIFNETMASK_ISO");
    623 	} else {
    624 		printf(" netmask %s ", iso_ntoa(&siso->siso_addr));
    625 	}
    626 	if (flags & IFF_POINTOPOINT) {
    627 		if (ioctl(s, SIOCGIFDSTADDR_ISO, (caddr_t)&ifr) < 0) {
    628 			if (errno == EADDRNOTAVAIL)
    629 			    memset(&ifr.ifr_Addr, 0, sizeof(ifr.ifr_Addr));
    630 			else
    631 			    warn("SIOCGIFDSTADDR_ISO");
    632 		}
    633 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
    634 		siso = &ifr.ifr_Addr;
    635 		printf("--> %s ", iso_ntoa(&siso->siso_addr));
    636 	}
    637 	putchar('\n');
    638 }
    639 
    640 #endif	/* INET_ONLY */
    641 
    642 struct	in_addr inet_makeaddr();
    643 
    644 #define SIN(x) ((struct sockaddr_in *) &(x))
    645 struct sockaddr_in *sintab[] = {
    646 SIN(ridreq.ifr_addr), SIN(addreq.ifra_addr),
    647 SIN(addreq.ifra_mask), SIN(addreq.ifra_broadaddr)};
    648 
    649 void
    650 in_getaddr(s, which)
    651 	char *s;
    652 	int which;
    653 {
    654 	register struct sockaddr_in *sin = sintab[which];
    655 	struct hostent *hp;
    656 	struct netent *np;
    657 
    658 	sin->sin_len = sizeof(*sin);
    659 	if (which != MASK)
    660 		sin->sin_family = AF_INET;
    661 
    662 	if (inet_aton(s, &sin->sin_addr) == 0) {
    663 		if (hp = gethostbyname(s))
    664 			memcpy(&sin->sin_addr, hp->h_addr, hp->h_length);
    665 		else if (np = getnetbyname(s))
    666 			sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
    667 		else
    668 			errx(1, "%s: bad value", s);
    669 	}
    670 }
    671 
    672 /*
    673  * Print a value a la the %b format of the kernel's printf
    674  */
    675 void
    676 printb(s, v, bits)
    677 	char *s;
    678 	register char *bits;
    679 	register unsigned short v;
    680 {
    681 	register int i, any = 0;
    682 	register char c;
    683 
    684 	if (bits && *bits == 8)
    685 		printf("%s=%o", s, v);
    686 	else
    687 		printf("%s=%x", s, v);
    688 	bits++;
    689 	if (bits) {
    690 		putchar('<');
    691 		while (i = *bits++) {
    692 			if (v & (1 << (i-1))) {
    693 				if (any)
    694 					putchar(',');
    695 				any = 1;
    696 				for (; (c = *bits) > 32; bits++)
    697 					putchar(c);
    698 			} else
    699 				for (; *bits > 32; bits++)
    700 					;
    701 		}
    702 		putchar('>');
    703 	}
    704 }
    705 
    706 #ifndef INET_ONLY
    707 
    708 #define SNS(x) ((struct sockaddr_ns *) &(x))
    709 struct sockaddr_ns *snstab[] = {
    710 SNS(ridreq.ifr_addr), SNS(addreq.ifra_addr),
    711 SNS(addreq.ifra_mask), SNS(addreq.ifra_broadaddr)};
    712 
    713 void
    714 xns_getaddr(addr, which)
    715 	char *addr;
    716 	int which;
    717 {
    718 	struct sockaddr_ns *sns = snstab[which];
    719 	struct ns_addr ns_addr();
    720 
    721 	sns->sns_family = AF_NS;
    722 	sns->sns_len = sizeof(*sns);
    723 	sns->sns_addr = ns_addr(addr);
    724 	if (which == MASK)
    725 		printf("Attempt to set XNS netmask will be ineffectual\n");
    726 }
    727 
    728 #define SISO(x) ((struct sockaddr_iso *) &(x))
    729 struct sockaddr_iso *sisotab[] = {
    730 SISO(iso_ridreq.ifr_Addr), SISO(iso_addreq.ifra_addr),
    731 SISO(iso_addreq.ifra_mask), SISO(iso_addreq.ifra_dstaddr)};
    732 
    733 void
    734 iso_getaddr(addr, which)
    735 	char *addr;
    736 	int which;
    737 {
    738 	register struct sockaddr_iso *siso = sisotab[which];
    739 	struct iso_addr *iso_addr();
    740 	siso->siso_addr = *iso_addr(addr);
    741 
    742 	if (which == MASK) {
    743 		siso->siso_len = TSEL(siso) - (caddr_t)(siso);
    744 		siso->siso_nlen = 0;
    745 	} else {
    746 		siso->siso_len = sizeof(*siso);
    747 		siso->siso_family = AF_ISO;
    748 	}
    749 }
    750 
    751 void
    752 setsnpaoffset(val)
    753 	char *val;
    754 {
    755 	iso_addreq.ifra_snpaoffset = atoi(val);
    756 }
    757 
    758 void
    759 setnsellength(val)
    760 	char *val;
    761 {
    762 	nsellength = atoi(val);
    763 	if (nsellength < 0)
    764 		errx(1, "Negative NSEL length is absurd");
    765 	if (afp == 0 || afp->af_af != AF_ISO)
    766 		errx(1, "Setting NSEL length valid only for iso");
    767 }
    768 
    769 void
    770 fixnsel(s)
    771 	register struct sockaddr_iso *s;
    772 {
    773 	if (s->siso_family == 0)
    774 		return;
    775 	s->siso_tlen = nsellength;
    776 }
    777 
    778 void
    779 adjust_nsellength()
    780 {
    781 	fixnsel(sisotab[RIDADDR]);
    782 	fixnsel(sisotab[ADDR]);
    783 	fixnsel(sisotab[DSTADDR]);
    784 }
    785 
    786 #endif	/* INET_ONLY */
    787 
    788 void
    789 usage()
    790 {
    791 	fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s%s",
    792 		"\t[ af [ address [ dest_addr ] ] [ up ] [ down ] ",
    793 		"[ netmask mask ] ]\n",
    794 		"\t[ metric n ]\n",
    795 		"\t[ arp | -arp ]\n",
    796 		"\t[ link0 | -link0 ] [ link1 | -link1 ] [ link2 | -link2 ]\n",
    797 		"       ifconfig -a [ af ]\n");
    798 	exit(1);
    799 }
    800