ifconfig.c revision 1.1 
1/*
2 * Copyright (c) 1983 Regents of the University of California.
3 * 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
35char copyright[] =
36"@(#) Copyright (c) 1983 Regents of the University of California.\n\
37 All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)ifconfig.c	5.1 (Berkeley) 2/28/91";
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#ifdef notdef
53#define	NSIP
54#include <netns/ns.h>
55#include <netns/ns_if.h>
56
57#define EON
58#include <netiso/iso.h>
59#include <netiso/iso_var.h>
60#endif
61#include <netdb.h>
62#include <sys/protosw.h>
63
64#include <unistd.h>
65#include <stdio.h>
66#include <errno.h>
67#include <ctype.h>
68#include <stdlib.h>
69#include <string.h>
70
71struct	ifreq		ifr, ridreq;
72struct	ifaliasreq	addreq;
73#ifdef	EON
74struct	iso_ifreq	iso_ridreq;
75struct	iso_aliasreq	iso_addreq;
76#endif
77struct	sockaddr_in	netmask;
78
79char	name[30];
80int	flags;
81int	metric;
82int	nsellength = 1;
83int	setaddr;
84int	setipdst;
85int	doalias;
86int	clearaddr;
87int	newaddr = 1;
88int	s;
89extern	int errno;
90
91int	setifflags(), setifaddr(), setifdstaddr(), setifnetmask();
92int	setifmetric(), setifbroadaddr(), setifipdst();
93int	notealias(), setsnpaoffset(), setnsellength();
94
95#define	NEXTARG		0xffffff
96
97struct	cmd {
98	char	*c_name;
99	int	c_parameter;		/* NEXTARG means next argv */
100	int	(*c_func)();
101} cmds[] = {
102	{ "up",		IFF_UP,		setifflags } ,
103	{ "down",	-IFF_UP,	setifflags },
104	{ "trailers",	-IFF_NOTRAILERS,setifflags },
105	{ "-trailers",	IFF_NOTRAILERS,	setifflags },
106	{ "arp",	-IFF_NOARP,	setifflags },
107	{ "-arp",	IFF_NOARP,	setifflags },
108	{ "debug",	IFF_DEBUG,	setifflags },
109	{ "-debug",	-IFF_DEBUG,	setifflags },
110	{ "alias",	IFF_UP,		notealias },
111	{ "-alias",	-IFF_UP,	notealias },
112	{ "delete",	-IFF_UP,	notealias },
113#ifdef notdef
114#define	EN_SWABIPS	0x1000
115	{ "swabips",	EN_SWABIPS,	setifflags },
116	{ "-swabips",	-EN_SWABIPS,	setifflags },
117#endif
118	{ "netmask",	NEXTARG,	setifnetmask },
119	{ "metric",	NEXTARG,	setifmetric },
120	{ "broadcast",	NEXTARG,	setifbroadaddr },
121	{ "ipdst",	NEXTARG,	setifipdst },
122	{ "snpaoffset",	NEXTARG,	setsnpaoffset },
123	{ "nsellength",	NEXTARG,	setnsellength },
124	{ 0,		0,		setifaddr },
125	{ 0,		0,		setifdstaddr },
126};
127
128/*
129 * XNS support liberally adapted from
130 * code written at the University of Maryland
131 * principally by James O'Toole and Chris Torek.
132 */
133int	in_status(), in_getaddr();
134#ifdef NSIP
135int	xns_status(), xns_getaddr();
136#endif
137#ifdef EON
138int	iso_status(), iso_getaddr();
139#endif
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#ifdef	NSIP
156	{ "ns", AF_NS, xns_status, xns_getaddr,
157	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
158#endif
159#ifdef	EON
160	{ "iso", AF_ISO, iso_status, iso_getaddr,
161	     SIOCDIFADDR_ISO, SIOCAIFADDR_ISO, C(iso_ridreq), C(iso_addreq) },
162#endif
163	{ 0,	0,	    0,		0 }
164};
165
166struct afswtch *afp;	/*the address family being set or asked about*/
167
168main(argc, argv)
169	int argc;
170	char *argv[];
171{
172	int af = AF_INET;
173	register struct afswtch *rafp;
174
175	if (argc < 2) {
176		fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s",
177		    "\t[ af [ address [ dest_addr ] ] [ up ] [ down ]",
178			    "[ netmask mask ] ]\n",
179		    "\t[ metric n ]\n",
180		    "\t[ trailers | -trailers ]\n",
181		    "\t[ arp | -arp ]\n");
182		exit(1);
183	}
184	argc--, argv++;
185	strncpy(name, *argv, sizeof(name));
186	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
187	argc--, argv++;
188	if (argc > 0) {
189		for (afp = rafp = afs; rafp->af_name; rafp++)
190			if (strcmp(rafp->af_name, *argv) == 0) {
191				afp = rafp; argc--; argv++;
192				break;
193			}
194		rafp = afp;
195		af = ifr.ifr_addr.sa_family = rafp->af_af;
196	}
197	s = socket(af, SOCK_DGRAM, 0);
198	if (s < 0) {
199		perror("ifconfig: socket");
200		exit(1);
201	}
202	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
203		Perror("ioctl (SIOCGIFFLAGS)");
204		exit(1);
205	}
206	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
207	flags = ifr.ifr_flags;
208	if (ioctl(s, SIOCGIFMETRIC, (caddr_t)&ifr) < 0)
209		perror("ioctl (SIOCGIFMETRIC)");
210	else
211		metric = ifr.ifr_metric;
212	if (argc == 0) {
213		status();
214		exit(0);
215	}
216	while (argc > 0) {
217		register struct cmd *p;
218
219		for (p = cmds; p->c_name; p++)
220			if (strcmp(*argv, p->c_name) == 0)
221				break;
222		if (p->c_name == 0 && setaddr)
223			p++;	/* got src, do dst */
224		if (p->c_func) {
225			if (p->c_parameter == NEXTARG) {
226				(*p->c_func)(argv[1]);
227				argc--, argv++;
228			} else
229				(*p->c_func)(*argv, p->c_parameter);
230		}
231		argc--, argv++;
232	}
233	if (af == AF_ISO)
234		adjust_nsellength();
235#ifdef	NSIP
236	if (setipdst && af==AF_NS) {
237		struct nsip_req rq;
238		int size = sizeof(rq);
239
240		rq.rq_ns = addreq.ifra_addr;
241		rq.rq_ip = addreq.ifra_dstaddr;
242
243		if (setsockopt(s, 0, SO_NSIP_ROUTE, &rq, size) < 0)
244			Perror("Encapsulation Routing");
245	}
246#endif
247	if (clearaddr) {
248		int ret;
249		strncpy(rafp->af_ridreq, name, sizeof ifr.ifr_name);
250		if ((ret = ioctl(s, rafp->af_difaddr, rafp->af_ridreq)) < 0) {
251			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
252				/* means no previous address for interface */
253			} else
254				Perror("ioctl (SIOCDIFADDR)");
255		}
256	}
257	if (newaddr) {
258		strncpy(rafp->af_addreq, name, sizeof ifr.ifr_name);
259		if (ioctl(s, rafp->af_aifaddr, rafp->af_addreq) < 0)
260			Perror("ioctl (SIOCAIFADDR)");
261	}
262	exit(0);
263}
264#define RIDADDR 0
265#define ADDR	1
266#define MASK	2
267#define DSTADDR	3
268
269/*ARGSUSED*/
270setifaddr(addr, param)
271	char *addr;
272	short param;
273{
274	/*
275	 * Delay the ioctl to set the interface addr until flags are all set.
276	 * The address interpretation may depend on the flags,
277	 * and the flags may change when the address is set.
278	 */
279	setaddr++;
280	if (doalias == 0)
281		clearaddr = 1;
282	(*afp->af_getaddr)(addr, (doalias >= 0 ? ADDR : RIDADDR));
283}
284
285setifnetmask(addr)
286	char *addr;
287{
288	(*afp->af_getaddr)(addr, MASK);
289}
290
291setifbroadaddr(addr)
292	char *addr;
293{
294	(*afp->af_getaddr)(addr, DSTADDR);
295}
296
297setifipdst(addr)
298	char *addr;
299{
300	in_getaddr(addr, DSTADDR);
301	setipdst++;
302	clearaddr = 0;
303	newaddr = 0;
304}
305#define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
306/*ARGSUSED*/
307notealias(addr, param)
308	char *addr;
309{
310	if (setaddr && doalias == 0 && param < 0)
311		bcopy((caddr_t)rqtosa(af_addreq),
312		      (caddr_t)rqtosa(af_ridreq),
313		      rqtosa(af_addreq)->sa_len);
314	doalias = param;
315	if (param < 0) {
316		clearaddr = 1;
317		newaddr = 0;
318	} else
319		clearaddr = 0;
320}
321
322/*ARGSUSED*/
323setifdstaddr(addr, param)
324	char *addr;
325	int param;
326{
327	(*afp->af_getaddr)(addr, DSTADDR);
328}
329
330setifflags(vname, value)
331	char *vname;
332	short value;
333{
334 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
335 		Perror("ioctl (SIOCGIFFLAGS)");
336 		exit(1);
337 	}
338	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
339 	flags = ifr.ifr_flags;
340
341	if (value < 0) {
342		value = -value;
343		flags &= ~value;
344	} else
345		flags |= value;
346	ifr.ifr_flags = flags;
347	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
348		Perror(vname);
349}
350
351setifmetric(val)
352	char *val;
353{
354	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
355	ifr.ifr_metric = atoi(val);
356	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
357		perror("ioctl (set metric)");
358}
359
360setsnpaoffset(val)
361	char *val;
362{
363#ifdef	EON
364	iso_addreq.ifra_snpaoffset = atoi(val);
365#endif
366}
367
368#define	IFFBITS \
369"\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
370"
371
372/*
373 * Print the status of the interface.  If an address family was
374 * specified, show it and it only; otherwise, show them all.
375 */
376status()
377{
378	register struct afswtch *p = afp;
379	short af = ifr.ifr_addr.sa_family;
380
381	printf("%s: ", name);
382	printb("flags", flags, IFFBITS);
383	if (metric)
384		printf(" metric %d", metric);
385	putchar('\n');
386	if ((p = afp) != NULL) {
387		(*p->af_status)(1);
388	} else for (p = afs; p->af_name; p++) {
389		ifr.ifr_addr.sa_family = p->af_af;
390		(*p->af_status)(0);
391	}
392}
393
394in_status(force)
395	int force;
396{
397	struct sockaddr_in *sin;
398	char *inet_ntoa();
399
400	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
401	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
402		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
403			if (!force)
404				return;
405			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
406		} else
407			perror("ioctl (SIOCGIFADDR)");
408	}
409	sin = (struct sockaddr_in *)&ifr.ifr_addr;
410	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
411	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
412	if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
413		if (errno != EADDRNOTAVAIL)
414			perror("ioctl (SIOCGIFNETMASK)");
415		bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
416	} else
417		netmask.sin_addr =
418		    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
419	if (flags & IFF_POINTOPOINT) {
420		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
421			if (errno == EADDRNOTAVAIL)
422			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
423			else
424			    perror("ioctl (SIOCGIFDSTADDR)");
425		}
426		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
427		sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
428		printf("--> %s ", inet_ntoa(sin->sin_addr));
429	}
430	printf("netmask %x ", ntohl(netmask.sin_addr.s_addr));
431	if (flags & IFF_BROADCAST) {
432		if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
433			if (errno == EADDRNOTAVAIL)
434			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
435			else
436			    perror("ioctl (SIOCGIFADDR)");
437		}
438		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
439		sin = (struct sockaddr_in *)&ifr.ifr_addr;
440		if (sin->sin_addr.s_addr != 0)
441			printf("broadcast %s", inet_ntoa(sin->sin_addr));
442	}
443	putchar('\n');
444}
445
446#ifdef	NSIP
447
448xns_status(force)
449	int force;
450{
451	struct sockaddr_ns *sns;
452
453	close(s);
454	s = socket(AF_NS, SOCK_DGRAM, 0);
455	if (s < 0) {
456		if (errno == EPROTONOSUPPORT)
457			return;
458		perror("ifconfig: socket");
459		exit(1);
460	}
461	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
462		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
463			if (!force)
464				return;
465			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
466		} else
467			perror("ioctl (SIOCGIFADDR)");
468	}
469	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
470	sns = (struct sockaddr_ns *)&ifr.ifr_addr;
471	printf("\tns %s ", ns_ntoa(sns->sns_addr));
472	if (flags & IFF_POINTOPOINT) { /* by W. Nesheim@Cornell */
473		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
474			if (errno == EADDRNOTAVAIL)
475			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
476			else
477			    Perror("ioctl (SIOCGIFDSTADDR)");
478		}
479		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
480		sns = (struct sockaddr_ns *)&ifr.ifr_dstaddr;
481		printf("--> %s ", ns_ntoa(sns->sns_addr));
482	}
483	putchar('\n');
484}
485
486#endif
487#ifdef	EON
488iso_status(force)
489	int force;
490{
491	struct sockaddr_iso *siso;
492	struct iso_ifreq ifr;
493
494	close(s);
495	s = socket(AF_ISO, SOCK_DGRAM, 0);
496	if (s < 0) {
497		if (errno == EPROTONOSUPPORT)
498			return;
499		perror("ifconfig: socket");
500		exit(1);
501	}
502	bzero((caddr_t)&ifr, sizeof(ifr));
503	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
504	if (ioctl(s, SIOCGIFADDR_ISO, (caddr_t)&ifr) < 0) {
505		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
506			if (!force)
507				return;
508			bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
509		} else {
510			perror("ioctl (SIOCGIFADDR_ISO)");
511			exit(1);
512		}
513	}
514	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
515	siso = &ifr.ifr_Addr;
516	printf("\tiso %s ", iso_ntoa(&siso->siso_addr));
517	if (ioctl(s, SIOCGIFNETMASK_ISO, (caddr_t)&ifr) < 0) {
518		if (errno != EADDRNOTAVAIL)
519			perror("ioctl (SIOCGIFNETMASK_ISO)");
520	} else {
521		printf(" netmask %s ", iso_ntoa(&siso->siso_addr));
522	}
523	if (flags & IFF_POINTOPOINT) {
524		if (ioctl(s, SIOCGIFDSTADDR_ISO, (caddr_t)&ifr) < 0) {
525			if (errno == EADDRNOTAVAIL)
526			    bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
527			else
528			    Perror("ioctl (SIOCGIFDSTADDR_ISO)");
529		}
530		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
531		siso = &ifr.ifr_Addr;
532		printf("--> %s ", iso_ntoa(&siso->siso_addr));
533	}
534	putchar('\n');
535}
536#endif
537
538Perror(cmd)
539	char *cmd;
540{
541	extern int errno;
542
543	fprintf(stderr, "ifconfig: ");
544	switch (errno) {
545
546	case ENXIO:
547		fprintf(stderr, "%s: no such interface\n", cmd);
548		break;
549
550	case EPERM:
551		fprintf(stderr, "%s: permission denied\n", cmd);
552		break;
553
554	default:
555		perror(cmd);
556	}
557	exit(1);
558}
559
560struct	in_addr inet_makeaddr();
561
562#define SIN(x) ((struct sockaddr_in *) &(x))
563struct sockaddr_in *sintab[] = {
564SIN(ridreq.ifr_addr), SIN(addreq.ifra_addr),
565SIN(addreq.ifra_mask), SIN(addreq.ifra_broadaddr)};
566
567in_getaddr(s, which)
568	char *s;
569{
570	register struct sockaddr_in *sin = sintab[which];
571	struct hostent *hp;
572	struct netent *np;
573	int val;
574
575	sin->sin_len = sizeof(*sin);
576	if (which != MASK)
577		sin->sin_family = AF_INET;
578
579	if ((val = inet_addr(s)) != -1)
580		sin->sin_addr.s_addr = val;
581	else if (hp = gethostbyname(s))
582		bcopy(hp->h_addr, (char *)&sin->sin_addr, hp->h_length);
583	else if (np = getnetbyname(s))
584		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
585	else {
586		fprintf(stderr, "%s: bad value\n", s);
587		exit(1);
588	}
589}
590
591/*
592 * Print a value a la the %b format of the kernel's printf
593 */
594printb(s, v, bits)
595	char *s;
596	register char *bits;
597	register unsigned short v;
598{
599	register int i, any = 0;
600	register char c;
601
602	if (bits && *bits == 8)
603		printf("%s=%o", s, v);
604	else
605		printf("%s=%x", s, v);
606	bits++;
607	if (bits) {
608		putchar('<');
609		while (i = *bits++) {
610			if (v & (1 << (i-1))) {
611				if (any)
612					putchar(',');
613				any = 1;
614				for (; (c = *bits) > 32; bits++)
615					putchar(c);
616			} else
617				for (; *bits > 32; bits++)
618					;
619		}
620		putchar('>');
621	}
622}
623#ifdef	NSIP
624
625#define SNS(x) ((struct sockaddr_ns *) &(x))
626struct sockaddr_ns *snstab[] = {
627SNS(ridreq.ifr_addr), SNS(addreq.ifra_addr),
628SNS(addreq.ifra_mask), SNS(addreq.ifra_broadaddr)};
629
630xns_getaddr(addr, which)
631char *addr;
632{
633	struct sockaddr_ns *sns = snstab[which];
634	struct ns_addr ns_addr();
635
636	sns->sns_family = AF_NS;
637	sns->sns_len = sizeof(*sns);
638	sns->sns_addr = ns_addr(addr);
639	if (which == MASK)
640		printf("Attempt to set XNS netmask will be ineffectual\n");
641}
642
643#endif
644#ifdef	EON
645#define SISO(x) ((struct sockaddr_iso *) &(x))
646struct sockaddr_iso *sisotab[] = {
647SISO(iso_ridreq.ifr_Addr), SISO(iso_addreq.ifra_addr),
648SISO(iso_addreq.ifra_mask), SISO(iso_addreq.ifra_dstaddr)};
649
650iso_getaddr(addr, which)
651char *addr;
652{
653	register struct sockaddr_iso *siso = sisotab[which];
654	struct iso_addr *iso_addr();
655	siso->siso_addr = *iso_addr(addr);
656
657	if (which == MASK) {
658		siso->siso_len = TSEL(siso) - (caddr_t)(siso);
659		siso->siso_nlen = 0;
660	} else {
661		siso->siso_len = sizeof(*siso);
662		siso->siso_family = AF_ISO;
663	}
664}
665#endif
666
667setnsellength(val)
668	char *val;
669{
670	nsellength = atoi(val);
671	if (nsellength < 0) {
672		fprintf(stderr, "Negative NSEL length is absurd\n");
673		exit (1);
674	}
675	if (afp == 0 || afp->af_af != AF_ISO) {
676		fprintf(stderr, "Setting NSEL length valid only for iso\n");
677		exit (1);
678	}
679}
680
681#ifdef notdef
682fixnsel(s)
683register struct sockaddr_iso *s;
684{
685	if (s->siso_family == 0)
686		return;
687	s->siso_tlen = nsellength;
688}
689#endif
690
691adjust_nsellength()
692{
693#ifdef notdef
694	fixnsel(sisotab[RIDADDR]);
695	fixnsel(sisotab[ADDR]);
696	fixnsel(sisotab[DSTADDR]);
697#endif
698}
699