ifconfig.c revision 1559 
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	nsellength = 1;
80int	setaddr;
81int	setipdst;
82int	doalias;
83int	clearaddr;
84int	newaddr = 1;
85int	s;
86extern	int errno;
87
88int	setifflags(), setifaddr(), setifdstaddr(), setifnetmask();
89int	setifmetric(), setifbroadaddr(), setifipdst();
90int	notealias(), setsnpaoffset(), setnsellength(), notrailers();
91
92#define	NEXTARG		0xffffff
93
94struct	cmd {
95	char	*c_name;
96	int	c_parameter;		/* NEXTARG means next argv */
97	int	(*c_func)();
98} cmds[] = {
99	{ "up",		IFF_UP,		setifflags } ,
100	{ "down",	-IFF_UP,	setifflags },
101	{ "trailers",	-1,		notrailers },
102	{ "-trailers",	1,		notrailers },
103	{ "arp",	-IFF_NOARP,	setifflags },
104	{ "-arp",	IFF_NOARP,	setifflags },
105	{ "debug",	IFF_DEBUG,	setifflags },
106	{ "-debug",	-IFF_DEBUG,	setifflags },
107	{ "alias",	IFF_UP,		notealias },
108	{ "-alias",	-IFF_UP,	notealias },
109	{ "delete",	-IFF_UP,	notealias },
110#ifdef notdef
111#define	EN_SWABIPS	0x1000
112	{ "swabips",	EN_SWABIPS,	setifflags },
113	{ "-swabips",	-EN_SWABIPS,	setifflags },
114#endif
115	{ "netmask",	NEXTARG,	setifnetmask },
116	{ "metric",	NEXTARG,	setifmetric },
117	{ "broadcast",	NEXTARG,	setifbroadaddr },
118	{ "ipdst",	NEXTARG,	setifipdst },
119	{ "snpaoffset",	NEXTARG,	setsnpaoffset },
120	{ "nsellength",	NEXTARG,	setnsellength },
121	{ "link0",	IFF_LINK0,	setifflags } ,
122	{ "-link0",	-IFF_LINK0,	setifflags } ,
123	{ "link1",	IFF_LINK1,	setifflags } ,
124	{ "-link1",	-IFF_LINK1,	setifflags } ,
125	{ "link2",	IFF_LINK2,	setifflags } ,
126	{ "-link2",	-IFF_LINK2,	setifflags } ,
127	{ 0,		0,		setifaddr },
128	{ 0,		0,		setifdstaddr },
129};
130
131/*
132 * XNS support liberally adapted from code written at the University of
133 * Maryland principally by James O'Toole and Chris Torek.
134 */
135int	in_status(), in_getaddr();
136int	xns_status(), xns_getaddr();
137int	iso_status(), iso_getaddr();
138
139/* Known address families */
140struct afswtch {
141	char *af_name;
142	short af_af;
143	int (*af_status)();
144	int (*af_getaddr)();
145	int af_difaddr;
146	int af_aifaddr;
147	caddr_t af_ridreq;
148	caddr_t af_addreq;
149} afs[] = {
150#define C(x) ((caddr_t) &x)
151	{ "inet", AF_INET, in_status, in_getaddr,
152	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
153	{ "ns", AF_NS, xns_status, xns_getaddr,
154	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
155	{ "iso", AF_ISO, iso_status, iso_getaddr,
156	     SIOCDIFADDR_ISO, SIOCAIFADDR_ISO, C(iso_ridreq), C(iso_addreq) },
157	{ 0,	0,	    0,		0 }
158};
159
160struct afswtch *afp;	/*the address family being set or asked about*/
161
162main(argc, argv)
163	int argc;
164	char *argv[];
165{
166	int af = AF_INET;
167	register struct afswtch *rafp;
168
169	if (argc < 2) {
170		fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s",
171		    "\t[ af [ address [ dest_addr ] ] [ up ] [ down ]",
172			    "[ netmask mask ] ]\n",
173		    "\t[ metric n ]\n",
174		    "\t[ arp | -arp ]\n",
175		    "\t[ link0 | -link0 ] [ link1 | -link1 ] [ link2 | -link2 ] \n");
176		exit(1);
177	}
178	argc--, argv++;
179	strncpy(name, *argv, sizeof(name));
180	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
181	argc--, argv++;
182	if (argc > 0) {
183		for (afp = rafp = afs; rafp->af_name; rafp++)
184			if (strcmp(rafp->af_name, *argv) == 0) {
185				afp = rafp; argc--; argv++;
186				break;
187			}
188		rafp = afp;
189		af = ifr.ifr_addr.sa_family = rafp->af_af;
190	}
191	s = socket(af, SOCK_DGRAM, 0);
192	if (s < 0) {
193		perror("ifconfig: socket");
194		exit(1);
195	}
196	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
197		Perror("ioctl (SIOCGIFFLAGS)");
198		exit(1);
199	}
200	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
201	flags = ifr.ifr_flags;
202	if (ioctl(s, SIOCGIFMETRIC, (caddr_t)&ifr) < 0)
203		perror("ioctl (SIOCGIFMETRIC)");
204	else
205		metric = ifr.ifr_metric;
206	if (argc == 0) {
207		status();
208		exit(0);
209	}
210	while (argc > 0) {
211		register struct cmd *p;
212
213		for (p = cmds; p->c_name; p++)
214			if (strcmp(*argv, p->c_name) == 0)
215				break;
216		if (p->c_name == 0 && setaddr)
217			p++;	/* got src, do dst */
218		if (p->c_func) {
219			if (p->c_parameter == NEXTARG) {
220				if (argv[1] == NULL)
221					errx(1, "'%s' requires argument",
222					    p->c_name);
223				(*p->c_func)(argv[1]);
224				argc--, argv++;
225			} else
226				(*p->c_func)(*argv, p->c_parameter);
227		}
228		argc--, argv++;
229	}
230	if (af == AF_ISO)
231		adjust_nsellength();
232	if (setipdst && af==AF_NS) {
233		struct nsip_req rq;
234		int size = sizeof(rq);
235
236		rq.rq_ns = addreq.ifra_addr;
237		rq.rq_ip = addreq.ifra_dstaddr;
238
239		if (setsockopt(s, 0, SO_NSIP_ROUTE, &rq, size) < 0)
240			Perror("Encapsulation Routing");
241	}
242	if (clearaddr) {
243		int ret;
244		strncpy(rafp->af_ridreq, name, sizeof ifr.ifr_name);
245		if ((ret = ioctl(s, rafp->af_difaddr, rafp->af_ridreq)) < 0) {
246			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
247				/* means no previous address for interface */
248			} else
249				Perror("ioctl (SIOCDIFADDR)");
250		}
251	}
252	if (newaddr) {
253		strncpy(rafp->af_addreq, name, sizeof ifr.ifr_name);
254		if (ioctl(s, rafp->af_aifaddr, rafp->af_addreq) < 0)
255			Perror("ioctl (SIOCAIFADDR)");
256	}
257	exit(0);
258}
259#define RIDADDR 0
260#define ADDR	1
261#define MASK	2
262#define DSTADDR	3
263
264/*ARGSUSED*/
265setifaddr(addr, param)
266	char *addr;
267	short param;
268{
269	/*
270	 * Delay the ioctl to set the interface addr until flags are all set.
271	 * The address interpretation may depend on the flags,
272	 * and the flags may change when the address is set.
273	 */
274	setaddr++;
275	if (doalias == 0)
276		clearaddr = 1;
277	(*afp->af_getaddr)(addr, (doalias >= 0 ? ADDR : RIDADDR));
278}
279
280setifnetmask(addr)
281	char *addr;
282{
283	(*afp->af_getaddr)(addr, MASK);
284}
285
286setifbroadaddr(addr)
287	char *addr;
288{
289	(*afp->af_getaddr)(addr, DSTADDR);
290}
291
292setifipdst(addr)
293	char *addr;
294{
295	in_getaddr(addr, DSTADDR);
296	setipdst++;
297	clearaddr = 0;
298	newaddr = 0;
299}
300#define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
301/*ARGSUSED*/
302notealias(addr, param)
303	char *addr;
304{
305	if (setaddr && doalias == 0 && param < 0)
306		bcopy((caddr_t)rqtosa(af_addreq),
307		      (caddr_t)rqtosa(af_ridreq),
308		      rqtosa(af_addreq)->sa_len);
309	doalias = param;
310	if (param < 0) {
311		clearaddr = 1;
312		newaddr = 0;
313	} else
314		clearaddr = 0;
315}
316
317/*ARGSUSED*/
318notrailers(vname, value)
319	char *vname;
320	int value;
321{
322	printf("Note: trailers are no longer sent, but always received\n");
323}
324
325/*ARGSUSED*/
326setifdstaddr(addr, param)
327	char *addr;
328	int param;
329{
330	(*afp->af_getaddr)(addr, DSTADDR);
331}
332
333setifflags(vname, value)
334	char *vname;
335	short value;
336{
337 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
338 		Perror("ioctl (SIOCGIFFLAGS)");
339 		exit(1);
340 	}
341	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
342 	flags = ifr.ifr_flags;
343
344	if (value < 0) {
345		value = -value;
346		flags &= ~value;
347	} else
348		flags |= value;
349	ifr.ifr_flags = flags;
350	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
351		Perror(vname);
352}
353
354setifmetric(val)
355	char *val;
356{
357	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
358	ifr.ifr_metric = atoi(val);
359	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
360		perror("ioctl (set metric)");
361}
362
363setsnpaoffset(val)
364	char *val;
365{
366	iso_addreq.ifra_snpaoffset = atoi(val);
367}
368
369#define	IFFBITS \
370"\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
371\11PROMISC\12ALLMULTI\13OACTIVE\14SIMPLEX\15LINK0\16LINK1\17LINK2\20MULTICAST"
372
373/*
374 * Print the status of the interface.  If an address family was
375 * specified, show it and it only; otherwise, show them all.
376 */
377status()
378{
379	register struct afswtch *p = afp;
380	short af = ifr.ifr_addr.sa_family;
381
382	printf("%s: ", name);
383	printb("flags", flags, IFFBITS);
384	if (metric)
385		printf(" metric %d", metric);
386	putchar('\n');
387	if ((p = afp) != NULL) {
388		(*p->af_status)(1);
389	} else for (p = afs; p->af_name; p++) {
390		ifr.ifr_addr.sa_family = p->af_af;
391		(*p->af_status)(0);
392	}
393}
394
395in_status(force)
396	int force;
397{
398	struct sockaddr_in *sin;
399	char *inet_ntoa();
400
401	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
402	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
403		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
404			if (!force)
405				return;
406			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
407		} else
408			perror("ioctl (SIOCGIFADDR)");
409	}
410	sin = (struct sockaddr_in *)&ifr.ifr_addr;
411	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
412	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
413	if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
414		if (errno != EADDRNOTAVAIL)
415			perror("ioctl (SIOCGIFNETMASK)");
416		bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
417	} else
418		netmask.sin_addr =
419		    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
420	if (flags & IFF_POINTOPOINT) {
421		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
422			if (errno == EADDRNOTAVAIL)
423			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
424			else
425			    perror("ioctl (SIOCGIFDSTADDR)");
426		}
427		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
428		sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
429		printf("--> %s ", inet_ntoa(sin->sin_addr));
430	}
431	printf("netmask 0x%x ", ntohl(netmask.sin_addr.s_addr));
432	if (flags & IFF_BROADCAST) {
433		if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
434			if (errno == EADDRNOTAVAIL)
435			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
436			else
437			    perror("ioctl (SIOCGIFADDR)");
438		}
439		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
440		sin = (struct sockaddr_in *)&ifr.ifr_addr;
441		if (sin->sin_addr.s_addr != 0)
442			printf("broadcast %s", inet_ntoa(sin->sin_addr));
443	}
444	putchar('\n');
445}
446
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
486iso_status(force)
487	int force;
488{
489	struct sockaddr_iso *siso;
490	struct iso_ifreq ifr;
491
492	close(s);
493	s = socket(AF_ISO, SOCK_DGRAM, 0);
494	if (s < 0) {
495		if (errno == EPROTONOSUPPORT)
496			return;
497		perror("ifconfig: socket");
498		exit(1);
499	}
500	bzero((caddr_t)&ifr, sizeof(ifr));
501	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
502	if (ioctl(s, SIOCGIFADDR_ISO, (caddr_t)&ifr) < 0) {
503		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
504			if (!force)
505				return;
506			bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
507		} else {
508			perror("ioctl (SIOCGIFADDR_ISO)");
509			exit(1);
510		}
511	}
512	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
513	siso = &ifr.ifr_Addr;
514	printf("\tiso %s ", iso_ntoa(&siso->siso_addr));
515	if (ioctl(s, SIOCGIFNETMASK_ISO, (caddr_t)&ifr) < 0) {
516		if (errno != EADDRNOTAVAIL)
517			perror("ioctl (SIOCGIFNETMASK_ISO)");
518	} else {
519		printf(" netmask %s ", iso_ntoa(&siso->siso_addr));
520	}
521	if (flags & IFF_POINTOPOINT) {
522		if (ioctl(s, SIOCGIFDSTADDR_ISO, (caddr_t)&ifr) < 0) {
523			if (errno == EADDRNOTAVAIL)
524			    bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
525			else
526			    Perror("ioctl (SIOCGIFDSTADDR_ISO)");
527		}
528		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
529		siso = &ifr.ifr_Addr;
530		printf("--> %s ", iso_ntoa(&siso->siso_addr));
531	}
532	putchar('\n');
533}
534
535Perror(cmd)
536	char *cmd;
537{
538	extern int errno;
539
540	switch (errno) {
541
542	case ENXIO:
543		errx(1, "%s: no such interface", cmd);
544		break;
545
546	case EPERM:
547		errx(1, "%s: permission denied", cmd);
548		break;
549
550	default:
551		err(1, "%s", cmd);
552	}
553}
554
555struct	in_addr inet_makeaddr();
556
557#define SIN(x) ((struct sockaddr_in *) &(x))
558struct sockaddr_in *sintab[] = {
559SIN(ridreq.ifr_addr), SIN(addreq.ifra_addr),
560SIN(addreq.ifra_mask), SIN(addreq.ifra_broadaddr)};
561
562in_getaddr(s, which)
563	char *s;
564{
565	register struct sockaddr_in *sin = sintab[which];
566	struct hostent *hp;
567	struct netent *np;
568	int val;
569
570	sin->sin_len = sizeof(*sin);
571	if (which != MASK)
572		sin->sin_family = AF_INET;
573
574	if ((val = inet_addr(s)) != -1)
575		sin->sin_addr.s_addr = val;
576	else if (hp = gethostbyname(s))
577		bcopy(hp->h_addr, (char *)&sin->sin_addr, hp->h_length);
578	else if (np = getnetbyname(s))
579		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
580	else
581		errx(1, "%s: bad value", s);
582}
583
584/*
585 * Print a value a la the %b format of the kernel's printf
586 */
587printb(s, v, bits)
588	char *s;
589	register char *bits;
590	register unsigned short v;
591{
592	register int i, any = 0;
593	register char c;
594
595	if (bits && *bits == 8)
596		printf("%s=%o", s, v);
597	else
598		printf("%s=%x", s, v);
599	bits++;
600	if (bits) {
601		putchar('<');
602		while (i = *bits++) {
603			if (v & (1 << (i-1))) {
604				if (any)
605					putchar(',');
606				any = 1;
607				for (; (c = *bits) > 32; bits++)
608					putchar(c);
609			} else
610				for (; *bits > 32; bits++)
611					;
612		}
613		putchar('>');
614	}
615}
616
617#define SNS(x) ((struct sockaddr_ns *) &(x))
618struct sockaddr_ns *snstab[] = {
619SNS(ridreq.ifr_addr), SNS(addreq.ifra_addr),
620SNS(addreq.ifra_mask), SNS(addreq.ifra_broadaddr)};
621
622xns_getaddr(addr, which)
623char *addr;
624{
625	struct sockaddr_ns *sns = snstab[which];
626	struct ns_addr ns_addr();
627
628	sns->sns_family = AF_NS;
629	sns->sns_len = sizeof(*sns);
630	sns->sns_addr = ns_addr(addr);
631	if (which == MASK)
632		printf("Attempt to set XNS netmask will be ineffectual\n");
633}
634
635#define SISO(x) ((struct sockaddr_iso *) &(x))
636struct sockaddr_iso *sisotab[] = {
637SISO(iso_ridreq.ifr_Addr), SISO(iso_addreq.ifra_addr),
638SISO(iso_addreq.ifra_mask), SISO(iso_addreq.ifra_dstaddr)};
639
640iso_getaddr(addr, which)
641char *addr;
642{
643	register struct sockaddr_iso *siso = sisotab[which];
644	struct iso_addr *iso_addr();
645	siso->siso_addr = *iso_addr(addr);
646
647	if (which == MASK) {
648		siso->siso_len = TSEL(siso) - (caddr_t)(siso);
649		siso->siso_nlen = 0;
650	} else {
651		siso->siso_len = sizeof(*siso);
652		siso->siso_family = AF_ISO;
653	}
654}
655
656setnsellength(val)
657	char *val;
658{
659	nsellength = atoi(val);
660	if (nsellength < 0)
661		errx(1, "Negative NSEL length is absurd");
662	if (afp == 0 || afp->af_af != AF_ISO)
663		errx(1, "Setting NSEL length valid only for iso");
664}
665
666fixnsel(s)
667register struct sockaddr_iso *s;
668{
669	if (s->siso_family == 0)
670		return;
671	s->siso_tlen = nsellength;
672}
673
674adjust_nsellength()
675{
676	fixnsel(sisotab[RIDADDR]);
677	fixnsel(sisotab[ADDR]);
678	fixnsel(sisotab[DSTADDR]);
679}
680