ifconfig.c revision 1940 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1983, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)ifconfig.c	8.2 (Berkeley) 2/16/94";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <sys/socket.h>
46#include <sys/ioctl.h>
47
48#include <net/if.h>
49#include <netinet/in.h>
50#include <arpa/inet.h>
51
52#define	NSIP
53#include <netns/ns.h>
54#include <netns/ns_if.h>
55#include <netdb.h>
56
57#define EON
58#include <netiso/iso.h>
59#include <netiso/iso_var.h>
60#include <sys/protosw.h>
61
62#include <ctype.h>
63#include <err.h>
64#include <errno.h>
65#include <stdio.h>
66#include <stdlib.h>
67#include <string.h>
68#include <unistd.h>
69
70struct	ifreq		ifr, ridreq;
71struct	ifaliasreq	addreq;
72struct	iso_ifreq	iso_ridreq;
73struct	iso_aliasreq	iso_addreq;
74struct	sockaddr_in	netmask;
75
76char	name[30];
77int	flags;
78int	metric;
79int	mtu;
80int	nsellength = 1;
81int	setaddr;
82int	setipdst;
83int	doalias;
84int	clearaddr;
85int	newaddr = 1;
86int	s;
87extern	int errno;
88
89int	setifflags(), setifaddr(), setifdstaddr(), setifnetmask();
90int	setifmetric(), setifmtu(), setifbroadaddr(), setifipdst();
91int	notealias(), setsnpaoffset(), setnsellength(), notrailers();
92
93#define	NEXTARG		0xffffff
94
95struct	cmd {
96	char	*c_name;
97	int	c_parameter;		/* NEXTARG means next argv */
98	int	(*c_func)();
99} cmds[] = {
100	{ "up",		IFF_UP,		setifflags } ,
101	{ "down",	-IFF_UP,	setifflags },
102	{ "trailers",	-1,		notrailers },
103	{ "-trailers",	1,		notrailers },
104	{ "arp",	-IFF_NOARP,	setifflags },
105	{ "-arp",	IFF_NOARP,	setifflags },
106	{ "debug",	IFF_DEBUG,	setifflags },
107	{ "-debug",	-IFF_DEBUG,	setifflags },
108	{ "alias",	IFF_UP,		notealias },
109	{ "-alias",	-IFF_UP,	notealias },
110	{ "delete",	-IFF_UP,	notealias },
111#ifdef notdef
112#define	EN_SWABIPS	0x1000
113	{ "swabips",	EN_SWABIPS,	setifflags },
114	{ "-swabips",	-EN_SWABIPS,	setifflags },
115#endif
116	{ "netmask",	NEXTARG,	setifnetmask },
117	{ "metric",	NEXTARG,	setifmetric },
118	{ "broadcast",	NEXTARG,	setifbroadaddr },
119	{ "ipdst",	NEXTARG,	setifipdst },
120	{ "snpaoffset",	NEXTARG,	setsnpaoffset },
121	{ "nsellength",	NEXTARG,	setnsellength },
122	{ "link0",	IFF_LINK0,	setifflags },
123	{ "-link0",	-IFF_LINK0,	setifflags },
124	{ "link1",	IFF_LINK1,	setifflags },
125	{ "-link1",	-IFF_LINK1,	setifflags },
126	{ "link2",	IFF_LINK2,	setifflags },
127	{ "-link2",	-IFF_LINK2,	setifflags },
128	{ "mtu",	NEXTARG,	setifmtu },
129	{ 0,		0,		setifaddr },
130	{ 0,		0,		setifdstaddr },
131};
132
133/*
134 * XNS support liberally adapted from code written at the University of
135 * Maryland principally by James O'Toole and Chris Torek.
136 */
137int	in_status(), in_getaddr();
138int	xns_status(), xns_getaddr();
139int	iso_status(), iso_getaddr();
140
141/* Known address families */
142struct afswtch {
143	char *af_name;
144	short af_af;
145	int (*af_status)();
146	int (*af_getaddr)();
147	int af_difaddr;
148	int af_aifaddr;
149	caddr_t af_ridreq;
150	caddr_t af_addreq;
151} afs[] = {
152#define C(x) ((caddr_t) &x)
153	{ "inet", AF_INET, in_status, in_getaddr,
154	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
155	{ "ns", AF_NS, xns_status, xns_getaddr,
156	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
157	{ "iso", AF_ISO, iso_status, iso_getaddr,
158	     SIOCDIFADDR_ISO, SIOCAIFADDR_ISO, C(iso_ridreq), C(iso_addreq) },
159	{ 0,	0,	    0,		0 }
160};
161
162struct afswtch *afp;	/*the address family being set or asked about*/
163
164main(argc, argv)
165	int argc;
166	char *argv[];
167{
168	int af = AF_INET;
169	register struct afswtch *rafp;
170
171	if (argc < 2) {
172		fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s%s",
173		    "\t[ af [ address [ dest_addr ] ] [ up ] [ down ]",
174			    "[ netmask mask ] ]\n",
175		    "\t[ metric n ]\n",
176		    "\t[ mtu n ]\n",
177		    "\t[ arp | -arp ]\n",
178		    "\t[ link0 | -link0 ] [ link1 | -link1 ] [ link2 | -link2 ] \n");
179		exit(1);
180	}
181	argc--, argv++;
182	strncpy(name, *argv, sizeof(name));
183	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
184	argc--, argv++;
185	if (argc > 0) {
186		for (afp = rafp = afs; rafp->af_name; rafp++)
187			if (strcmp(rafp->af_name, *argv) == 0) {
188				afp = rafp; argc--; argv++;
189				break;
190			}
191		rafp = afp;
192		af = ifr.ifr_addr.sa_family = rafp->af_af;
193	}
194	s = socket(af, SOCK_DGRAM, 0);
195	if (s < 0) {
196		perror("ifconfig: socket");
197		exit(1);
198	}
199	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
200		Perror("ioctl (SIOCGIFFLAGS)");
201		exit(1);
202	}
203	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
204	flags = ifr.ifr_flags;
205	if (ioctl(s, SIOCGIFMETRIC, (caddr_t)&ifr) < 0)
206		perror("ioctl (SIOCGIFMETRIC)");
207	else
208		metric = ifr.ifr_metric;
209	if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0)
210		perror("ioctl (SIOCGIFMTU)");
211	else
212		mtu = ifr.ifr_mtu;
213	if (argc == 0) {
214		status();
215		exit(0);
216	}
217	while (argc > 0) {
218		register struct cmd *p;
219
220		for (p = cmds; p->c_name; p++)
221			if (strcmp(*argv, p->c_name) == 0)
222				break;
223		if (p->c_name == 0 && setaddr)
224			p++;	/* got src, do dst */
225		if (p->c_func) {
226			if (p->c_parameter == NEXTARG) {
227				if (argv[1] == NULL)
228					errx(1, "'%s' requires argument",
229					    p->c_name);
230				(*p->c_func)(argv[1]);
231				argc--, argv++;
232			} else
233				(*p->c_func)(*argv, p->c_parameter);
234		}
235		argc--, argv++;
236	}
237	if (af == AF_ISO)
238		adjust_nsellength();
239	if (setipdst && af==AF_NS) {
240		struct nsip_req rq;
241		int size = sizeof(rq);
242
243		rq.rq_ns = addreq.ifra_addr;
244		rq.rq_ip = addreq.ifra_dstaddr;
245
246		if (setsockopt(s, 0, SO_NSIP_ROUTE, &rq, size) < 0)
247			Perror("Encapsulation Routing");
248	}
249	if (clearaddr) {
250		int ret;
251		strncpy(rafp->af_ridreq, name, sizeof ifr.ifr_name);
252		if ((ret = ioctl(s, rafp->af_difaddr, rafp->af_ridreq)) < 0) {
253			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
254				/* means no previous address for interface */
255			} else
256				Perror("ioctl (SIOCDIFADDR)");
257		}
258	}
259	if (newaddr) {
260		strncpy(rafp->af_addreq, name, sizeof ifr.ifr_name);
261		if (ioctl(s, rafp->af_aifaddr, rafp->af_addreq) < 0)
262			Perror("ioctl (SIOCAIFADDR)");
263	}
264	exit(0);
265}
266#define RIDADDR 0
267#define ADDR	1
268#define MASK	2
269#define DSTADDR	3
270
271/*ARGSUSED*/
272setifaddr(addr, param)
273	char *addr;
274	short param;
275{
276	/*
277	 * Delay the ioctl to set the interface addr until flags are all set.
278	 * The address interpretation may depend on the flags,
279	 * and the flags may change when the address is set.
280	 */
281	setaddr++;
282	if (doalias == 0)
283		clearaddr = 1;
284	(*afp->af_getaddr)(addr, (doalias >= 0 ? ADDR : RIDADDR));
285}
286
287setifnetmask(addr)
288	char *addr;
289{
290	(*afp->af_getaddr)(addr, MASK);
291}
292
293setifbroadaddr(addr)
294	char *addr;
295{
296	(*afp->af_getaddr)(addr, DSTADDR);
297}
298
299setifipdst(addr)
300	char *addr;
301{
302	in_getaddr(addr, DSTADDR);
303	setipdst++;
304	clearaddr = 0;
305	newaddr = 0;
306}
307#define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
308/*ARGSUSED*/
309notealias(addr, param)
310	char *addr;
311{
312	if (setaddr && doalias == 0 && param < 0)
313		bcopy((caddr_t)rqtosa(af_addreq),
314		      (caddr_t)rqtosa(af_ridreq),
315		      rqtosa(af_addreq)->sa_len);
316	doalias = param;
317	if (param < 0) {
318		clearaddr = 1;
319		newaddr = 0;
320	} else
321		clearaddr = 0;
322}
323
324/*ARGSUSED*/
325notrailers(vname, value)
326	char *vname;
327	int value;
328{
329	printf("Note: trailers are no longer sent, but always received\n");
330}
331
332/*ARGSUSED*/
333setifdstaddr(addr, param)
334	char *addr;
335	int param;
336{
337	(*afp->af_getaddr)(addr, DSTADDR);
338}
339
340setifflags(vname, value)
341	char *vname;
342	short value;
343{
344 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
345 		Perror("ioctl (SIOCGIFFLAGS)");
346 		exit(1);
347 	}
348	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
349 	flags = ifr.ifr_flags;
350
351	if (value < 0) {
352		value = -value;
353		flags &= ~value;
354	} else
355		flags |= value;
356	ifr.ifr_flags = flags;
357	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
358		Perror(vname);
359}
360
361setifmetric(val)
362	char *val;
363{
364	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
365	ifr.ifr_metric = atoi(val);
366	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
367		perror("ioctl (set metric)");
368}
369
370setifmtu(val)
371	char *val;
372{
373	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
374	ifr.ifr_mtu = atoi(val);
375	if (ioctl(s, SIOCSIFMTU, (caddr_t)&ifr) < 0)
376		perror("ioctl (set mtu)");
377}
378
379setsnpaoffset(val)
380	char *val;
381{
382	iso_addreq.ifra_snpaoffset = atoi(val);
383}
384
385#define	IFFBITS \
386"\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
387\11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2\20MULTICAST"
388
389/*
390 * Print the status of the interface.  If an address family was
391 * specified, show it and it only; otherwise, show them all.
392 */
393status()
394{
395	register struct afswtch *p = afp;
396	short af = ifr.ifr_addr.sa_family;
397
398	printf("%s: ", name);
399	printb("flags", flags, IFFBITS);
400	if (metric)
401		printf(" metric %d", metric);
402	if (mtu)
403		printf(" mtu %d", mtu);
404	putchar('\n');
405	if ((p = afp) != NULL) {
406		(*p->af_status)(1);
407	} else for (p = afs; p->af_name; p++) {
408		ifr.ifr_addr.sa_family = p->af_af;
409		(*p->af_status)(0);
410	}
411}
412
413in_status(force)
414	int force;
415{
416	struct sockaddr_in *sin;
417	char *inet_ntoa();
418
419	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
420	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
421		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
422			if (!force)
423				return;
424			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
425		} else
426			perror("ioctl (SIOCGIFADDR)");
427	}
428	sin = (struct sockaddr_in *)&ifr.ifr_addr;
429	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
430	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
431	if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
432		if (errno != EADDRNOTAVAIL)
433			perror("ioctl (SIOCGIFNETMASK)");
434		bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
435	} else
436		netmask.sin_addr =
437		    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
438	if (flags & IFF_POINTOPOINT) {
439		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
440			if (errno == EADDRNOTAVAIL)
441			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
442			else
443			    perror("ioctl (SIOCGIFDSTADDR)");
444		}
445		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
446		sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
447		printf("--> %s ", inet_ntoa(sin->sin_addr));
448	}
449	printf("netmask 0x%x ", ntohl(netmask.sin_addr.s_addr));
450	if (flags & IFF_BROADCAST) {
451		if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
452			if (errno == EADDRNOTAVAIL)
453			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
454			else
455			    perror("ioctl (SIOCGIFADDR)");
456		}
457		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
458		sin = (struct sockaddr_in *)&ifr.ifr_addr;
459		if (sin->sin_addr.s_addr != 0)
460			printf("broadcast %s", inet_ntoa(sin->sin_addr));
461	}
462	putchar('\n');
463}
464
465
466xns_status(force)
467	int force;
468{
469	struct sockaddr_ns *sns;
470
471	close(s);
472	s = socket(AF_NS, SOCK_DGRAM, 0);
473	if (s < 0) {
474		if (errno == EPROTONOSUPPORT)
475			return;
476		perror("ifconfig: socket");
477		exit(1);
478	}
479	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
480		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
481			if (!force)
482				return;
483			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
484		} else
485			perror("ioctl (SIOCGIFADDR)");
486	}
487	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
488	sns = (struct sockaddr_ns *)&ifr.ifr_addr;
489	printf("\tns %s ", ns_ntoa(sns->sns_addr));
490	if (flags & IFF_POINTOPOINT) { /* by W. Nesheim@Cornell */
491		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
492			if (errno == EADDRNOTAVAIL)
493			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
494			else
495			    Perror("ioctl (SIOCGIFDSTADDR)");
496		}
497		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
498		sns = (struct sockaddr_ns *)&ifr.ifr_dstaddr;
499		printf("--> %s ", ns_ntoa(sns->sns_addr));
500	}
501	putchar('\n');
502}
503
504iso_status(force)
505	int force;
506{
507	struct sockaddr_iso *siso;
508	struct iso_ifreq ifr;
509
510	close(s);
511	s = socket(AF_ISO, SOCK_DGRAM, 0);
512	if (s < 0) {
513		if (errno == EPROTONOSUPPORT)
514			return;
515		perror("ifconfig: socket");
516		exit(1);
517	}
518	bzero((caddr_t)&ifr, sizeof(ifr));
519	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
520	if (ioctl(s, SIOCGIFADDR_ISO, (caddr_t)&ifr) < 0) {
521		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
522			if (!force)
523				return;
524			bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
525		} else {
526			perror("ioctl (SIOCGIFADDR_ISO)");
527			exit(1);
528		}
529	}
530	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
531	siso = &ifr.ifr_Addr;
532	printf("\tiso %s ", iso_ntoa(&siso->siso_addr));
533	if (ioctl(s, SIOCGIFNETMASK_ISO, (caddr_t)&ifr) < 0) {
534		if (errno != EADDRNOTAVAIL)
535			perror("ioctl (SIOCGIFNETMASK_ISO)");
536	} else {
537		printf(" netmask %s ", iso_ntoa(&siso->siso_addr));
538	}
539	if (flags & IFF_POINTOPOINT) {
540		if (ioctl(s, SIOCGIFDSTADDR_ISO, (caddr_t)&ifr) < 0) {
541			if (errno == EADDRNOTAVAIL)
542			    bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
543			else
544			    Perror("ioctl (SIOCGIFDSTADDR_ISO)");
545		}
546		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
547		siso = &ifr.ifr_Addr;
548		printf("--> %s ", iso_ntoa(&siso->siso_addr));
549	}
550	putchar('\n');
551}
552
553Perror(cmd)
554	char *cmd;
555{
556	extern int errno;
557
558	switch (errno) {
559
560	case ENXIO:
561		errx(1, "%s: no such interface", cmd);
562		break;
563
564	case EPERM:
565		errx(1, "%s: permission denied", cmd);
566		break;
567
568	default:
569		err(1, "%s", cmd);
570	}
571}
572
573struct	in_addr inet_makeaddr();
574
575#define SIN(x) ((struct sockaddr_in *) &(x))
576struct sockaddr_in *sintab[] = {
577SIN(ridreq.ifr_addr), SIN(addreq.ifra_addr),
578SIN(addreq.ifra_mask), SIN(addreq.ifra_broadaddr)};
579
580in_getaddr(s, which)
581	char *s;
582{
583	register struct sockaddr_in *sin = sintab[which];
584	struct hostent *hp;
585	struct netent *np;
586	int val;
587
588	sin->sin_len = sizeof(*sin);
589	if (which != MASK)
590		sin->sin_family = AF_INET;
591
592	if ((val = inet_addr(s)) != -1)
593		sin->sin_addr.s_addr = val;
594	else if (hp = gethostbyname(s))
595		bcopy(hp->h_addr, (char *)&sin->sin_addr, hp->h_length);
596	else if (np = getnetbyname(s))
597		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
598	else
599		errx(1, "%s: bad value", s);
600}
601
602/*
603 * Print a value a la the %b format of the kernel's printf
604 */
605printb(s, v, bits)
606	char *s;
607	register char *bits;
608	register unsigned short v;
609{
610	register int i, any = 0;
611	register char c;
612
613	if (bits && *bits == 8)
614		printf("%s=%o", s, v);
615	else
616		printf("%s=%x", s, v);
617	bits++;
618	if (bits) {
619		putchar('<');
620		while (i = *bits++) {
621			if (v & (1 << (i-1))) {
622				if (any)
623					putchar(',');
624				any = 1;
625				for (; (c = *bits) > 32; bits++)
626					putchar(c);
627			} else
628				for (; *bits > 32; bits++)
629					;
630		}
631		putchar('>');
632	}
633}
634
635#define SNS(x) ((struct sockaddr_ns *) &(x))
636struct sockaddr_ns *snstab[] = {
637SNS(ridreq.ifr_addr), SNS(addreq.ifra_addr),
638SNS(addreq.ifra_mask), SNS(addreq.ifra_broadaddr)};
639
640xns_getaddr(addr, which)
641char *addr;
642{
643	struct sockaddr_ns *sns = snstab[which];
644	struct ns_addr ns_addr();
645
646	sns->sns_family = AF_NS;
647	sns->sns_len = sizeof(*sns);
648	sns->sns_addr = ns_addr(addr);
649	if (which == MASK)
650		printf("Attempt to set XNS netmask will be ineffectual\n");
651}
652
653#define SISO(x) ((struct sockaddr_iso *) &(x))
654struct sockaddr_iso *sisotab[] = {
655SISO(iso_ridreq.ifr_Addr), SISO(iso_addreq.ifra_addr),
656SISO(iso_addreq.ifra_mask), SISO(iso_addreq.ifra_dstaddr)};
657
658iso_getaddr(addr, which)
659char *addr;
660{
661	register struct sockaddr_iso *siso = sisotab[which];
662	struct iso_addr *iso_addr();
663	siso->siso_addr = *iso_addr(addr);
664
665	if (which == MASK) {
666		siso->siso_len = TSEL(siso) - (caddr_t)(siso);
667		siso->siso_nlen = 0;
668	} else {
669		siso->siso_len = sizeof(*siso);
670		siso->siso_family = AF_ISO;
671	}
672}
673
674setnsellength(val)
675	char *val;
676{
677	nsellength = atoi(val);
678	if (nsellength < 0)
679		errx(1, "Negative NSEL length is absurd");
680	if (afp == 0 || afp->af_af != AF_ISO)
681		errx(1, "Setting NSEL length valid only for iso");
682}
683
684fixnsel(s)
685register struct sockaddr_iso *s;
686{
687	if (s->siso_family == 0)
688		return;
689	s->siso_tlen = nsellength;
690}
691
692adjust_nsellength()
693{
694	fixnsel(sisotab[RIDADDR]);
695	fixnsel(sisotab[ADDR]);
696	fixnsel(sisotab[DSTADDR]);
697}
698