xref: /original-bsd/sbin/ifconfig/ifconfig.c (revision 95a66346) 
1 /*
2  * Copyright (c) 1983 Regents of the University of California.
3  * All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  */
7 
8 #ifndef lint
9 char copyright[] =
10 "@(#) Copyright (c) 1983 Regents of the University of California.\n\
11  All rights reserved.\n";
12 #endif /* not lint */
13 
14 #ifndef lint
15 static char sccsid[] = "@(#)ifconfig.c	5.1 (Berkeley) 02/28/91";
16 #endif /* not lint */
17 
18 #include <sys/param.h>
19 #include <sys/socket.h>
20 #include <sys/ioctl.h>
21 
22 #include <net/if.h>
23 #include <netinet/in.h>
24 #include <arpa/inet.h>
25 
26 #define	NSIP
27 #include <netns/ns.h>
28 #include <netns/ns_if.h>
29 #include <netdb.h>
30 
31 #define EON
32 #include <netiso/iso.h>
33 #include <netiso/iso_var.h>
34 #include <sys/protosw.h>
35 
36 #include <unistd.h>
37 #include <stdio.h>
38 #include <errno.h>
39 #include <ctype.h>
40 #include <stdlib.h>
41 #include <string.h>
42 
43 struct	ifreq		ifr, ridreq;
44 struct	ifaliasreq	addreq;
45 struct	iso_ifreq	iso_ridreq;
46 struct	iso_aliasreq	iso_addreq;
47 struct	sockaddr_in	netmask;
48 
49 char	name[30];
50 int	flags;
51 int	metric;
52 int	nsellength = 1;
53 int	setaddr;
54 int	setipdst;
55 int	doalias;
56 int	clearaddr;
57 int	newaddr = 1;
58 int	s;
59 extern	int errno;
60 
61 int	setifflags(), setifaddr(), setifdstaddr(), setifnetmask();
62 int	setifmetric(), setifbroadaddr(), setifipdst();
63 int	notealias(), setsnpaoffset(), setnsellength();
64 
65 #define	NEXTARG		0xffffff
66 
67 struct	cmd {
68 	char	*c_name;
69 	int	c_parameter;		/* NEXTARG means next argv */
70 	int	(*c_func)();
71 } cmds[] = {
72 	{ "up",		IFF_UP,		setifflags } ,
73 	{ "down",	-IFF_UP,	setifflags },
74 	{ "trailers",	-IFF_NOTRAILERS,setifflags },
75 	{ "-trailers",	IFF_NOTRAILERS,	setifflags },
76 	{ "arp",	-IFF_NOARP,	setifflags },
77 	{ "-arp",	IFF_NOARP,	setifflags },
78 	{ "debug",	IFF_DEBUG,	setifflags },
79 	{ "-debug",	-IFF_DEBUG,	setifflags },
80 	{ "alias",	IFF_UP,		notealias },
81 	{ "-alias",	-IFF_UP,	notealias },
82 	{ "delete",	-IFF_UP,	notealias },
83 #ifdef notdef
84 #define	EN_SWABIPS	0x1000
85 	{ "swabips",	EN_SWABIPS,	setifflags },
86 	{ "-swabips",	-EN_SWABIPS,	setifflags },
87 #endif
88 	{ "netmask",	NEXTARG,	setifnetmask },
89 	{ "metric",	NEXTARG,	setifmetric },
90 	{ "broadcast",	NEXTARG,	setifbroadaddr },
91 	{ "ipdst",	NEXTARG,	setifipdst },
92 	{ "snpaoffset",	NEXTARG,	setsnpaoffset },
93 	{ "nsellength",	NEXTARG,	setnsellength },
94 	{ 0,		0,		setifaddr },
95 	{ 0,		0,		setifdstaddr },
96 };
97 
98 /*
99  * XNS support liberally adapted from
100  * code written at the University of Maryland
101  * principally by James O'Toole and Chris Torek.
102  */
103 int	in_status(), in_getaddr();
104 int	xns_status(), xns_getaddr();
105 int	iso_status(), iso_getaddr();
106 
107 /* Known address families */
108 struct afswtch {
109 	char *af_name;
110 	short af_af;
111 	int (*af_status)();
112 	int (*af_getaddr)();
113 	int af_difaddr;
114 	int af_aifaddr;
115 	caddr_t af_ridreq;
116 	caddr_t af_addreq;
117 } afs[] = {
118 #define C(x) ((caddr_t) &x)
119 	{ "inet", AF_INET, in_status, in_getaddr,
120 	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
121 	{ "ns", AF_NS, xns_status, xns_getaddr,
122 	     SIOCDIFADDR, SIOCAIFADDR, C(ridreq), C(addreq) },
123 	{ "iso", AF_ISO, iso_status, iso_getaddr,
124 	     SIOCDIFADDR_ISO, SIOCAIFADDR_ISO, C(iso_ridreq), C(iso_addreq) },
125 	{ 0,	0,	    0,		0 }
126 };
127 
128 struct afswtch *afp;	/*the address family being set or asked about*/
129 
130 main(argc, argv)
131 	int argc;
132 	char *argv[];
133 {
134 	int af = AF_INET;
135 	register struct afswtch *rafp;
136 
137 	if (argc < 2) {
138 		fprintf(stderr, "usage: ifconfig interface\n%s%s%s%s%s",
139 		    "\t[ af [ address [ dest_addr ] ] [ up ] [ down ]",
140 			    "[ netmask mask ] ]\n",
141 		    "\t[ metric n ]\n",
142 		    "\t[ trailers | -trailers ]\n",
143 		    "\t[ arp | -arp ]\n");
144 		exit(1);
145 	}
146 	argc--, argv++;
147 	strncpy(name, *argv, sizeof(name));
148 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
149 	argc--, argv++;
150 	if (argc > 0) {
151 		for (afp = rafp = afs; rafp->af_name; rafp++)
152 			if (strcmp(rafp->af_name, *argv) == 0) {
153 				afp = rafp; argc--; argv++;
154 				break;
155 			}
156 		rafp = afp;
157 		af = ifr.ifr_addr.sa_family = rafp->af_af;
158 	}
159 	s = socket(af, SOCK_DGRAM, 0);
160 	if (s < 0) {
161 		perror("ifconfig: socket");
162 		exit(1);
163 	}
164 	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
165 		Perror("ioctl (SIOCGIFFLAGS)");
166 		exit(1);
167 	}
168 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
169 	flags = ifr.ifr_flags;
170 	if (ioctl(s, SIOCGIFMETRIC, (caddr_t)&ifr) < 0)
171 		perror("ioctl (SIOCGIFMETRIC)");
172 	else
173 		metric = ifr.ifr_metric;
174 	if (argc == 0) {
175 		status();
176 		exit(0);
177 	}
178 	while (argc > 0) {
179 		register struct cmd *p;
180 
181 		for (p = cmds; p->c_name; p++)
182 			if (strcmp(*argv, p->c_name) == 0)
183 				break;
184 		if (p->c_name == 0 && setaddr)
185 			p++;	/* got src, do dst */
186 		if (p->c_func) {
187 			if (p->c_parameter == NEXTARG) {
188 				(*p->c_func)(argv[1]);
189 				argc--, argv++;
190 			} else
191 				(*p->c_func)(*argv, p->c_parameter);
192 		}
193 		argc--, argv++;
194 	}
195 	if (af == AF_ISO)
196 		adjust_nsellength();
197 	if (setipdst && af==AF_NS) {
198 		struct nsip_req rq;
199 		int size = sizeof(rq);
200 
201 		rq.rq_ns = addreq.ifra_addr;
202 		rq.rq_ip = addreq.ifra_dstaddr;
203 
204 		if (setsockopt(s, 0, SO_NSIP_ROUTE, &rq, size) < 0)
205 			Perror("Encapsulation Routing");
206 	}
207 	if (clearaddr) {
208 		int ret;
209 		strncpy(rafp->af_ridreq, name, sizeof ifr.ifr_name);
210 		if ((ret = ioctl(s, rafp->af_difaddr, rafp->af_ridreq)) < 0) {
211 			if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
212 				/* means no previous address for interface */
213 			} else
214 				Perror("ioctl (SIOCDIFADDR)");
215 		}
216 	}
217 	if (newaddr) {
218 		strncpy(rafp->af_addreq, name, sizeof ifr.ifr_name);
219 		if (ioctl(s, rafp->af_aifaddr, rafp->af_addreq) < 0)
220 			Perror("ioctl (SIOCAIFADDR)");
221 	}
222 	exit(0);
223 }
224 #define RIDADDR 0
225 #define ADDR	1
226 #define MASK	2
227 #define DSTADDR	3
228 
229 /*ARGSUSED*/
230 setifaddr(addr, param)
231 	char *addr;
232 	short param;
233 {
234 	/*
235 	 * Delay the ioctl to set the interface addr until flags are all set.
236 	 * The address interpretation may depend on the flags,
237 	 * and the flags may change when the address is set.
238 	 */
239 	setaddr++;
240 	if (doalias == 0)
241 		clearaddr = 1;
242 	(*afp->af_getaddr)(addr, (doalias >= 0 ? ADDR : RIDADDR));
243 }
244 
245 setifnetmask(addr)
246 	char *addr;
247 {
248 	(*afp->af_getaddr)(addr, MASK);
249 }
250 
251 setifbroadaddr(addr)
252 	char *addr;
253 {
254 	(*afp->af_getaddr)(addr, DSTADDR);
255 }
256 
257 setifipdst(addr)
258 	char *addr;
259 {
260 	in_getaddr(addr, DSTADDR);
261 	setipdst++;
262 	clearaddr = 0;
263 	newaddr = 0;
264 }
265 #define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
266 /*ARGSUSED*/
267 notealias(addr, param)
268 	char *addr;
269 {
270 	if (setaddr && doalias == 0 && param < 0)
271 		bcopy((caddr_t)rqtosa(af_addreq),
272 		      (caddr_t)rqtosa(af_ridreq),
273 		      rqtosa(af_addreq)->sa_len);
274 	doalias = param;
275 	if (param < 0) {
276 		clearaddr = 1;
277 		newaddr = 0;
278 	} else
279 		clearaddr = 0;
280 }
281 
282 /*ARGSUSED*/
283 setifdstaddr(addr, param)
284 	char *addr;
285 	int param;
286 {
287 	(*afp->af_getaddr)(addr, DSTADDR);
288 }
289 
290 setifflags(vname, value)
291 	char *vname;
292 	short value;
293 {
294  	if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
295  		Perror("ioctl (SIOCGIFFLAGS)");
296  		exit(1);
297  	}
298 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
299  	flags = ifr.ifr_flags;
300 
301 	if (value < 0) {
302 		value = -value;
303 		flags &= ~value;
304 	} else
305 		flags |= value;
306 	ifr.ifr_flags = flags;
307 	if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
308 		Perror(vname);
309 }
310 
311 setifmetric(val)
312 	char *val;
313 {
314 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
315 	ifr.ifr_metric = atoi(val);
316 	if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
317 		perror("ioctl (set metric)");
318 }
319 
320 setsnpaoffset(val)
321 	char *val;
322 {
323 	iso_addreq.ifra_snpaoffset = atoi(val);
324 }
325 
326 #define	IFFBITS \
327 "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6NOTRAILERS\7RUNNING\10NOARP\
328 "
329 
330 /*
331  * Print the status of the interface.  If an address family was
332  * specified, show it and it only; otherwise, show them all.
333  */
334 status()
335 {
336 	register struct afswtch *p = afp;
337 	short af = ifr.ifr_addr.sa_family;
338 
339 	printf("%s: ", name);
340 	printb("flags", flags, IFFBITS);
341 	if (metric)
342 		printf(" metric %d", metric);
343 	putchar('\n');
344 	if ((p = afp) != NULL) {
345 		(*p->af_status)(1);
346 	} else for (p = afs; p->af_name; p++) {
347 		ifr.ifr_addr.sa_family = p->af_af;
348 		(*p->af_status)(0);
349 	}
350 }
351 
352 in_status(force)
353 	int force;
354 {
355 	struct sockaddr_in *sin;
356 	char *inet_ntoa();
357 
358 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
359 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
360 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
361 			if (!force)
362 				return;
363 			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
364 		} else
365 			perror("ioctl (SIOCGIFADDR)");
366 	}
367 	sin = (struct sockaddr_in *)&ifr.ifr_addr;
368 	printf("\tinet %s ", inet_ntoa(sin->sin_addr));
369 	strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
370 	if (ioctl(s, SIOCGIFNETMASK, (caddr_t)&ifr) < 0) {
371 		if (errno != EADDRNOTAVAIL)
372 			perror("ioctl (SIOCGIFNETMASK)");
373 		bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
374 	} else
375 		netmask.sin_addr =
376 		    ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
377 	if (flags & IFF_POINTOPOINT) {
378 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
379 			if (errno == EADDRNOTAVAIL)
380 			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
381 			else
382 			    perror("ioctl (SIOCGIFDSTADDR)");
383 		}
384 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
385 		sin = (struct sockaddr_in *)&ifr.ifr_dstaddr;
386 		printf("--> %s ", inet_ntoa(sin->sin_addr));
387 	}
388 	printf("netmask %x ", ntohl(netmask.sin_addr.s_addr));
389 	if (flags & IFF_BROADCAST) {
390 		if (ioctl(s, SIOCGIFBRDADDR, (caddr_t)&ifr) < 0) {
391 			if (errno == EADDRNOTAVAIL)
392 			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
393 			else
394 			    perror("ioctl (SIOCGIFADDR)");
395 		}
396 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
397 		sin = (struct sockaddr_in *)&ifr.ifr_addr;
398 		if (sin->sin_addr.s_addr != 0)
399 			printf("broadcast %s", inet_ntoa(sin->sin_addr));
400 	}
401 	putchar('\n');
402 }
403 
404 
405 xns_status(force)
406 	int force;
407 {
408 	struct sockaddr_ns *sns;
409 
410 	close(s);
411 	s = socket(AF_NS, SOCK_DGRAM, 0);
412 	if (s < 0) {
413 		if (errno == EPROTONOSUPPORT)
414 			return;
415 		perror("ifconfig: socket");
416 		exit(1);
417 	}
418 	if (ioctl(s, SIOCGIFADDR, (caddr_t)&ifr) < 0) {
419 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
420 			if (!force)
421 				return;
422 			bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
423 		} else
424 			perror("ioctl (SIOCGIFADDR)");
425 	}
426 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
427 	sns = (struct sockaddr_ns *)&ifr.ifr_addr;
428 	printf("\tns %s ", ns_ntoa(sns->sns_addr));
429 	if (flags & IFF_POINTOPOINT) { /* by W. Nesheim@Cornell */
430 		if (ioctl(s, SIOCGIFDSTADDR, (caddr_t)&ifr) < 0) {
431 			if (errno == EADDRNOTAVAIL)
432 			    bzero((char *)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
433 			else
434 			    Perror("ioctl (SIOCGIFDSTADDR)");
435 		}
436 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
437 		sns = (struct sockaddr_ns *)&ifr.ifr_dstaddr;
438 		printf("--> %s ", ns_ntoa(sns->sns_addr));
439 	}
440 	putchar('\n');
441 }
442 
443 iso_status(force)
444 	int force;
445 {
446 	struct sockaddr_iso *siso;
447 	struct iso_ifreq ifr;
448 
449 	close(s);
450 	s = socket(AF_ISO, SOCK_DGRAM, 0);
451 	if (s < 0) {
452 		if (errno == EPROTONOSUPPORT)
453 			return;
454 		perror("ifconfig: socket");
455 		exit(1);
456 	}
457 	bzero((caddr_t)&ifr, sizeof(ifr));
458 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
459 	if (ioctl(s, SIOCGIFADDR_ISO, (caddr_t)&ifr) < 0) {
460 		if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) {
461 			if (!force)
462 				return;
463 			bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
464 		} else {
465 			perror("ioctl (SIOCGIFADDR_ISO)");
466 			exit(1);
467 		}
468 	}
469 	strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
470 	siso = &ifr.ifr_Addr;
471 	printf("\tiso %s ", iso_ntoa(&siso->siso_addr));
472 	if (ioctl(s, SIOCGIFNETMASK_ISO, (caddr_t)&ifr) < 0) {
473 		if (errno != EADDRNOTAVAIL)
474 			perror("ioctl (SIOCGIFNETMASK_ISO)");
475 	} else {
476 		printf(" netmask %s ", iso_ntoa(&siso->siso_addr));
477 	}
478 	if (flags & IFF_POINTOPOINT) {
479 		if (ioctl(s, SIOCGIFDSTADDR_ISO, (caddr_t)&ifr) < 0) {
480 			if (errno == EADDRNOTAVAIL)
481 			    bzero((char *)&ifr.ifr_Addr, sizeof(ifr.ifr_Addr));
482 			else
483 			    Perror("ioctl (SIOCGIFDSTADDR_ISO)");
484 		}
485 		strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
486 		siso = &ifr.ifr_Addr;
487 		printf("--> %s ", iso_ntoa(&siso->siso_addr));
488 	}
489 	putchar('\n');
490 }
491 
492 Perror(cmd)
493 	char *cmd;
494 {
495 	extern int errno;
496 
497 	fprintf(stderr, "ifconfig: ");
498 	switch (errno) {
499 
500 	case ENXIO:
501 		fprintf(stderr, "%s: no such interface\n", cmd);
502 		break;
503 
504 	case EPERM:
505 		fprintf(stderr, "%s: permission denied\n", cmd);
506 		break;
507 
508 	default:
509 		perror(cmd);
510 	}
511 	exit(1);
512 }
513 
514 struct	in_addr inet_makeaddr();
515 
516 #define SIN(x) ((struct sockaddr_in *) &(x))
517 struct sockaddr_in *sintab[] = {
518 SIN(ridreq.ifr_addr), SIN(addreq.ifra_addr),
519 SIN(addreq.ifra_mask), SIN(addreq.ifra_broadaddr)};
520 
521 in_getaddr(s, which)
522 	char *s;
523 {
524 	register struct sockaddr_in *sin = sintab[which];
525 	struct hostent *hp;
526 	struct netent *np;
527 	int val;
528 
529 	sin->sin_len = sizeof(*sin);
530 	if (which != MASK)
531 		sin->sin_family = AF_INET;
532 
533 	if ((val = inet_addr(s)) != -1)
534 		sin->sin_addr.s_addr = val;
535 	else if (hp = gethostbyname(s))
536 		bcopy(hp->h_addr, (char *)&sin->sin_addr, hp->h_length);
537 	else if (np = getnetbyname(s))
538 		sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
539 	else {
540 		fprintf(stderr, "%s: bad value\n", s);
541 		exit(1);
542 	}
543 }
544 
545 /*
546  * Print a value a la the %b format of the kernel's printf
547  */
548 printb(s, v, bits)
549 	char *s;
550 	register char *bits;
551 	register unsigned short v;
552 {
553 	register int i, any = 0;
554 	register char c;
555 
556 	if (bits && *bits == 8)
557 		printf("%s=%o", s, v);
558 	else
559 		printf("%s=%x", s, v);
560 	bits++;
561 	if (bits) {
562 		putchar('<');
563 		while (i = *bits++) {
564 			if (v & (1 << (i-1))) {
565 				if (any)
566 					putchar(',');
567 				any = 1;
568 				for (; (c = *bits) > 32; bits++)
569 					putchar(c);
570 			} else
571 				for (; *bits > 32; bits++)
572 					;
573 		}
574 		putchar('>');
575 	}
576 }
577 
578 #define SNS(x) ((struct sockaddr_ns *) &(x))
579 struct sockaddr_ns *snstab[] = {
580 SNS(ridreq.ifr_addr), SNS(addreq.ifra_addr),
581 SNS(addreq.ifra_mask), SNS(addreq.ifra_broadaddr)};
582 
583 xns_getaddr(addr, which)
584 char *addr;
585 {
586 	struct sockaddr_ns *sns = snstab[which];
587 	struct ns_addr ns_addr();
588 
589 	sns->sns_family = AF_NS;
590 	sns->sns_len = sizeof(*sns);
591 	sns->sns_addr = ns_addr(addr);
592 	if (which == MASK)
593 		printf("Attempt to set XNS netmask will be ineffectual\n");
594 }
595 
596 #define SISO(x) ((struct sockaddr_iso *) &(x))
597 struct sockaddr_iso *sisotab[] = {
598 SISO(iso_ridreq.ifr_Addr), SISO(iso_addreq.ifra_addr),
599 SISO(iso_addreq.ifra_mask), SISO(iso_addreq.ifra_dstaddr)};
600 
601 iso_getaddr(addr, which)
602 char *addr;
603 {
604 	register struct sockaddr_iso *siso = sisotab[which];
605 	struct iso_addr *iso_addr();
606 	siso->siso_addr = *iso_addr(addr);
607 
608 	if (which == MASK) {
609 		siso->siso_len = TSEL(siso) - (caddr_t)(siso);
610 		siso->siso_nlen = 0;
611 	} else {
612 		siso->siso_len = sizeof(*siso);
613 		siso->siso_family = AF_ISO;
614 	}
615 }
616 
617 setnsellength(val)
618 	char *val;
619 {
620 	nsellength = atoi(val);
621 	if (nsellength < 0) {
622 		fprintf(stderr, "Negative NSEL length is absurd\n");
623 		exit (1);
624 	}
625 	if (afp == 0 || afp->af_af != AF_ISO) {
626 		fprintf(stderr, "Setting NSEL length valid only for iso\n");
627 		exit (1);
628 	}
629 }
630 
631 fixnsel(s)
632 register struct sockaddr_iso *s;
633 {
634 	if (s->siso_family == 0)
635 		return;
636 	s->siso_tlen = nsellength;
637 }
638 
639 adjust_nsellength()
640 {
641 	fixnsel(sisotab[RIDADDR]);
642 	fixnsel(sisotab[ADDR]);
643 	fixnsel(sisotab[DSTADDR]);
644 }
645