xref: /netbsd/usr.sbin/mrouted/cfparse.y (revision b98c10df) 
1 %{
2 /*	$NetBSD: cfparse.y,v 1.14 2003/07/13 12:40:17 itojun Exp $	*/
3 
4 /*
5  * Configuration file parser for mrouted.
6  *
7  * Written by Bill Fenner, NRL, 1994
8  * Copyright (c) 1994
9  * Naval Research Laboratory (NRL/CCS)
10  *                    and the
11  * Defense Advanced Research Projects Agency (DARPA)
12  *
13  * All Rights Reserved.
14  *
15  * Permission to use, copy, modify and distribute this software and its
16  * documentation is hereby granted, provided that both the copyright notice and
17  * this permission notice appear in all copies of the software, derivative
18  * works or modified versions, and any portions thereof, and that both notices
19  * appear in supporting documentation.
20  *
21  * NRL AND DARPA ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION AND
22  * DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM
23  * THE USE OF THIS SOFTWARE.
24  */
25 #include <stdio.h>
26 #include <stdarg.h>
27 #include "defs.h"
28 #include <netdb.h>
29 
30 /*
31  * Local function declarations
32  */
33 static void		fatal(char *fmt, ...)
34     __attribute__((__format__(__printf__, 1, 2)));
35 static void		warn(char *fmt, ...)
36         __attribute__((__format__(__printf__, 1, 2)));
37 static void		yyerror(char *s);
38 static char *		next_word(void);
39 static int		yylex(void);
40 static u_int32_t	valid_if(char *s);
41 static struct ifreq *	ifconfaddr(struct ifconf *ifcp, u_int32_t a);
42 int			yyparse(void);
43 
44 static FILE *f __attribute__((__unused__));	/* XXX egcs */
45 extern int udp_socket;
46 char *configfilename = _PATH_MROUTED_CONF;
47 
48 extern int cache_lifetime;
49 extern int max_prune_lifetime;
50 
51 static int lineno;
52 static struct ifreq ifbuf[32];
53 static struct ifconf ifc;
54 
55 static struct uvif *v;
56 
57 static int order;
58 
59 struct addrmask {
60 	u_int32_t	addr;
61 	int	mask;
62 };
63 
64 struct boundnam {
65 	char		*name;
66 	struct addrmask	 bound;
67 };
68 
69 #define MAXBOUNDS 20
70 
71 struct boundnam boundlist[MAXBOUNDS];	/* Max. of 20 named boundaries */
72 int numbounds = 0;			/* Number of named boundaries */
73 
74 %}
75 
76 %union
77 {
78 	int num;
79 	char *ptr;
80 	struct addrmask addrmask;
81 	u_int32_t addr;
82 };
83 
84 %token CACHE_LIFETIME PRUNING
85 %token PHYINT TUNNEL NAME
86 %token DISABLE IGMPV1 SRCRT
87 %token METRIC THRESHOLD RATE_LIMIT BOUNDARY NETMASK ALTNET
88 %token SYSNAM SYSCONTACT SYSVERSION SYSLOCATION
89 %token <num> BOOLEAN
90 %token <num> NUMBER
91 %token <ptr> STRING
92 %token <addrmask> ADDRMASK
93 %token <addr> ADDR
94 
95 %type <addr> interface addrname
96 %type <addrmask> bound boundary addrmask
97 
98 %start conf
99 
100 %%
101 
102 conf	: stmts
103 	;
104 
105 stmts	: /* Empty */
106 	| stmts stmt
107 	;
108 
109 stmt	: error
110 	| PHYINT interface 		{
111 
112 			vifi_t vifi;
113 
114 			if (order)
115 			    fatal("phyints must appear before tunnels");
116 
117 			for (vifi = 0, v = uvifs;
118 			     vifi < numvifs;
119 			     ++vifi, ++v)
120 			    if (!(v->uv_flags & VIFF_TUNNEL) &&
121 				$2 == v->uv_lcl_addr)
122 				break;
123 
124 			if (vifi == numvifs)
125 			    fatal("%s is not a configured interface",
126 				inet_fmt($2));
127 
128 					}
129 		ifmods
130 	| TUNNEL interface addrname	{
131 
132 			struct ifreq *ifr;
133 			struct ifreq ffr;
134 			vifi_t vifi;
135 
136 			order++;
137 
138 			ifr = ifconfaddr(&ifc, $2);
139 			if (ifr == 0)
140 			    fatal("Tunnel local address %s is not mine",
141 				inet_fmt($2));
142 
143 			strncpy(ffr.ifr_name, ifr->ifr_name, IFNAMSIZ);
144 			if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ffr)<0)
145 			    fatal("ioctl SIOCGIFFLAGS on %s",ffr.ifr_name);
146 			if (ffr.ifr_flags & IFF_LOOPBACK)
147 			    fatal("Tunnel local address %s is a loopback interface",
148 				inet_fmt($2));
149 
150 			if (ifconfaddr(&ifc, $3) != 0)
151 			    fatal("Tunnel remote address %s is one of mine",
152 				inet_fmt($3));
153 
154 			for (vifi = 0, v = uvifs;
155 			     vifi < numvifs;
156 			     ++vifi, ++v)
157 			    if (v->uv_flags & VIFF_TUNNEL) {
158 				if ($3 == v->uv_rmt_addr)
159 				    fatal("Duplicate tunnel to %s",
160 					inet_fmt($3));
161 			    } else if (!(v->uv_flags & VIFF_DISABLED)) {
162 				if (($3 & v->uv_subnetmask) == v->uv_subnet)
163 				    fatal("Unnecessary tunnel to %s",
164 					inet_fmt($3));
165 			    }
166 
167 			if (numvifs == MAXVIFS)
168 			    fatal("too many vifs");
169 
170 			v = &uvifs[numvifs];
171 			v->uv_flags	= VIFF_TUNNEL;
172 			v->uv_metric	= DEFAULT_METRIC;
173 			v->uv_rate_limit= DEFAULT_TUN_RATE_LIMIT;
174 			v->uv_threshold	= DEFAULT_THRESHOLD;
175 			v->uv_lcl_addr	= $2;
176 			v->uv_rmt_addr	= $3;
177 			v->uv_subnet	= 0;
178 			v->uv_subnetmask= 0;
179 			v->uv_subnetbcast= 0;
180 			strncpy(v->uv_name, ffr.ifr_name, IFNAMSIZ);
181 			v->uv_groups	= NULL;
182 			v->uv_neighbors	= NULL;
183 			v->uv_acl	= NULL;
184 			v->uv_addrs	= NULL;
185 
186 			if (!(ffr.ifr_flags & IFF_UP)) {
187 			    v->uv_flags |= VIFF_DOWN;
188 			    vifs_down = TRUE;
189 			}
190 					}
191 		tunnelmods
192 					{
193 			logit(LOG_INFO, 0,
194 			    "installing tunnel from %s to %s as vif #%u - rate=%d",
195 			    inet_fmt($2),
196 			    inet_fmt($3),
197 			    numvifs, v->uv_rate_limit);
198 
199 			++numvifs;
200 					}
201 	| PRUNING BOOLEAN	    { pruning = $2; }
202 	| CACHE_LIFETIME NUMBER     { cache_lifetime = $2;
203 				      max_prune_lifetime = cache_lifetime * 2;
204 				    }
205 	| NAME STRING boundary	    { if (numbounds >= MAXBOUNDS) {
206 					fatal("Too many named boundaries (max %d)", MAXBOUNDS);
207 				      }
208 
209 				      boundlist[numbounds].name = strdup($2);
210 				      boundlist[numbounds++].bound = $3;
211 				    }
212 	| SYSNAM STRING    {
213 #ifdef SNMP
214 			    set_sysName($2);
215 #endif /* SNMP */
216 			    }
217 	| SYSCONTACT STRING {
218 #ifdef SNMP
219 			    set_sysContact($2);
220 #endif /* SNMP */
221 			    }
222         | SYSVERSION STRING {
223 #ifdef SNMP
224 			    set_sysVersion($2);
225 #endif /* SNMP */
226 			    }
227 	| SYSLOCATION STRING {
228 #ifdef SNMP
229 			    set_sysLocation($2);
230 #endif /* SNMP */
231 			    }
232 	;
233 
234 tunnelmods	: /* empty */
235 	| tunnelmods tunnelmod
236 	;
237 
238 tunnelmod	: mod
239 	| SRCRT			{ fatal("Source-route tunnels not supported"); }
240 	;
241 
242 ifmods	: /* empty */
243 	| ifmods ifmod
244 	;
245 
246 ifmod	: mod
247 	| DISABLE		{ v->uv_flags |= VIFF_DISABLED; }
248 	| IGMPV1		{ v->uv_flags |= VIFF_IGMPV1; }
249 	| NETMASK addrname	{
250 				  u_int32_t subnet, mask;
251 
252 				  mask = $2;
253 				  subnet = v->uv_lcl_addr & mask;
254 				  if (!inet_valid_subnet(subnet, mask))
255 					fatal("Invalid netmask");
256 				  v->uv_subnet = subnet;
257 				  v->uv_subnetmask = mask;
258 				  v->uv_subnetbcast = subnet | ~mask;
259 				}
260 	| NETMASK		{
261 
262 		    warn("Expected address after netmask keyword, ignored");
263 
264 				}
265 	| ALTNET addrmask	{
266 
267 		    struct phaddr *ph;
268 
269 		    ph = (struct phaddr *)malloc(sizeof(struct phaddr));
270 		    if (ph == NULL)
271 			fatal("out of memory");
272 		    if ($2.mask) {
273 			VAL_TO_MASK(ph->pa_subnetmask, $2.mask);
274 		    } else
275 			ph->pa_subnetmask = v->uv_subnetmask;
276 		    ph->pa_subnet = $2.addr & ph->pa_subnetmask;
277 		    ph->pa_subnetbcast = ph->pa_subnet | ~ph->pa_subnetmask;
278 		    if ($2.addr & ~ph->pa_subnetmask)
279 			warn("Extra subnet %s/%d has host bits set",
280 				inet_fmt($2.addr), $2.mask);
281 		    ph->pa_next = v->uv_addrs;
282 		    v->uv_addrs = ph;
283 
284 				}
285 	| ALTNET		{
286 
287 		    warn("Expected address after altnet keyword, ignored");
288 
289 				}
290 	;
291 
292 mod	: THRESHOLD NUMBER	{ if ($2 < 1 || $2 > 255)
293 				    fatal("Invalid threshold %d",$2);
294 				  v->uv_threshold = $2;
295 				}
296 	| THRESHOLD		{
297 
298 		    warn("Expected number after threshold keyword, ignored");
299 
300 				}
301 	| METRIC NUMBER		{ if ($2 < 1 || $2 > UNREACHABLE)
302 				    fatal("Invalid metric %d",$2);
303 				  v->uv_metric = $2;
304 				}
305 	| METRIC		{
306 
307 		    warn("Expected number after metric keyword, ignored");
308 
309 				}
310 	| RATE_LIMIT NUMBER	{ if ($2 > MAX_RATE_LIMIT)
311 				    fatal("Invalid rate_limit %d",$2);
312 				  v->uv_rate_limit = $2;
313 				}
314 	| RATE_LIMIT		{
315 
316 		    warn("Expected number after rate_limit keyword, ignored");
317 
318 				}
319 	| BOUNDARY bound	{
320 
321 		    struct vif_acl *v_acl;
322 
323 		    v_acl = (struct vif_acl *)malloc(sizeof(struct vif_acl));
324 		    if (v_acl == NULL)
325 			fatal("out of memory");
326 		    VAL_TO_MASK(v_acl->acl_mask, $2.mask);
327 		    v_acl->acl_addr = $2.addr & v_acl->acl_mask;
328 		    if ($2.addr & ~v_acl->acl_mask)
329 			warn("Boundary spec %s/%d has host bits set",
330 				inet_fmt($2.addr),$2.mask);
331 		    v_acl->acl_next = v->uv_acl;
332 		    v->uv_acl = v_acl;
333 
334 				}
335 	| BOUNDARY		{
336 
337 		warn("Expected boundary spec after boundary keyword, ignored");
338 
339 				}
340 	;
341 
342 interface	: ADDR		{ $$ = $1; }
343 	| STRING		{
344 				  $$ = valid_if($1);
345 				  if ($$ == 0)
346 					fatal("Invalid interface name %s",$1);
347 				}
348 	;
349 
350 addrname	: ADDR		{ $$ = $1; }
351 	| STRING		{ struct hostent *hp;
352 
353 				  if ((hp = gethostbyname($1)) == NULL)
354 				    fatal("No such host %s", $1);
355 
356 				  if (hp->h_addr_list[1])
357 				    fatal("Hostname %s does not %s",
358 					$1, "map to a unique address");
359 
360 				  bcopy(hp->h_addr_list[0], &$$,
361 					    hp->h_length);
362 				}
363 
364 bound	: boundary		{ $$ = $1; }
365 	| STRING		{ int i;
366 
367 				  for (i=0; i < numbounds; i++) {
368 				    if (!strcmp(boundlist[i].name, $1)) {
369 					$$ = boundlist[i].bound;
370 					break;
371 				    }
372 				  }
373 				  if (i == numbounds) {
374 				    fatal("Invalid boundary name %s",$1);
375 				  }
376 				}
377 	;
378 
379 boundary	: ADDRMASK	{
380 
381 			if ((ntohl($1.addr) & 0xff000000) != 0xef000000) {
382 			    fatal("Boundaries must be 239.x.x.x, not %s/%d",
383 				inet_fmt($1.addr), $1.mask);
384 			}
385 			$$ = $1;
386 
387 				}
388 	;
389 
390 addrmask	: ADDRMASK	{ $$ = $1; }
391 	| ADDR			{ $$.addr = $1; $$.mask = 0; }
392 	;
393 %%
394 static void
395 fatal(char *fmt, ...)
396 {
397 	va_list ap;
398 	char buf[200];
399 
400 	va_start(ap, fmt);
401 	vsnprintf(buf, sizeof(buf), fmt, ap);
402 	va_end(ap);
403 
404 	logit(LOG_ERR,0,"%s: %s near line %d", configfilename, buf, lineno);
405 }
406 
407 static void
408 warn(char *fmt, ...)
409 {
410 	va_list ap;
411 	char buf[200];
412 
413 	va_start(ap, fmt);
414 	vsnprintf(buf, sizeof(buf), fmt, ap);
415 	va_end(ap);
416 
417 	logit(LOG_WARNING,0,"%s: %s near line %d", configfilename, buf, lineno);
418 }
419 
420 static void
421 yyerror(s)
422 char *s;
423 {
424 	logit(LOG_ERR, 0, "%s: %s near line %d", configfilename, s, lineno);
425 }
426 
427 static char *
428 next_word()
429 {
430 	static char buf[1024];
431 	static char *p=NULL;
432 	extern FILE *f;
433 	char *q;
434 
435 	while (1) {
436 	    if (!p || !*p) {
437 		lineno++;
438 		if (fgets(buf, sizeof(buf), f) == NULL)
439 		    return NULL;
440 		p = buf;
441 	    }
442 	    while (*p && (*p == ' ' || *p == '\t'))	/* skip whitespace */
443 		p++;
444 	    if (*p == '#') {
445 		p = NULL;		/* skip comments */
446 		continue;
447 	    }
448 	    q = p;
449 #ifdef SNMP
450        if (*p == '"') {
451           p++;
452 	       while (*p && *p != '"' && *p != '\n')
453 		      p++;		/* find next whitespace */
454           if (*p == '"')
455              p++;
456        } else
457 #endif
458 	    while (*p && *p != ' ' && *p != '\t' && *p != '\n')
459 		p++;		/* find next whitespace */
460 	    *p++ = '\0';	/* null-terminate string */
461 
462 	    if (!*q) {
463 		p = NULL;
464 		continue;	/* if 0-length string, read another line */
465 	    }
466 
467 	    return q;
468 	}
469 }
470 
471 static int
472 yylex()
473 {
474 	int n;
475 	u_int32_t addr;
476 	char *q;
477 	char c;
478 
479 	if ((q = next_word()) == NULL) {
480 		return 0;
481 	}
482 
483 	if (!strcmp(q,"cache_lifetime"))
484 		return CACHE_LIFETIME;
485 	if (!strcmp(q,"pruning"))
486 		return PRUNING;
487 	if (!strcmp(q,"phyint"))
488 		return PHYINT;
489 	if (!strcmp(q,"tunnel"))
490 		return TUNNEL;
491 	if (!strcmp(q,"disable"))
492 		return DISABLE;
493 	if (!strcmp(q,"metric"))
494 		return METRIC;
495 	if (!strcmp(q,"threshold"))
496 		return THRESHOLD;
497 	if (!strcmp(q,"rate_limit"))
498 		return RATE_LIMIT;
499 	if (!strcmp(q,"srcrt") || !strcmp(q,"sourceroute"))
500 		return SRCRT;
501 	if (!strcmp(q,"boundary"))
502 		return BOUNDARY;
503 	if (!strcmp(q,"netmask"))
504 		return NETMASK;
505 	if (!strcmp(q,"igmpv1"))
506 		return IGMPV1;
507 	if (!strcmp(q,"altnet"))
508 		return ALTNET;
509 	if (!strcmp(q,"name"))
510 		return NAME;
511 	if (!strcmp(q,"on") || !strcmp(q,"yes")) {
512 		yylval.num = 1;
513 		return BOOLEAN;
514 	}
515 	if (!strcmp(q,"off") || !strcmp(q,"no")) {
516 		yylval.num = 0;
517 		return BOOLEAN;
518 	}
519 	if ((addr = inet_parse(q, &n)) != 0xffffffff) {
520 		yylval.addrmask.mask = n;
521 		yylval.addrmask.addr = addr;
522 		return ADDRMASK;
523 	}
524 	if ((addr = inet_parse(q,0)) != 0xffffffff &&
525 	    inet_valid_host(addr)) {
526 		yylval.addr = addr;
527 		return ADDR;
528 	}
529 	if (sscanf(q,"0x%8x%c",&n,&c) == 1) {
530 		yylval.addr = n;
531 		return ADDR;
532 	}
533 	if (sscanf(q,"%d%c",&n,&c) == 1) {
534 		yylval.num = n;
535 		return NUMBER;
536 	}
537 #ifdef SNMP
538 	if (!strcmp(q,"sysName"))
539 		return SYSNAM;
540 	if (!strcmp(q,"sysContact"))
541 		return SYSCONTACT;
542 	if (!strcmp(q,"sysVersion"))
543 		return SYSVERSION;
544 	if (!strcmp(q,"sysLocation"))
545 		return SYSLOCATION;
546    if (*q=='"') {
547       if (q[ strlen(q)-1 ]=='"')
548          q[ strlen(q)-1 ]='\0'; /* trash trailing quote */
549       yylval.ptr = q+1;
550       return STRING;
551    }
552 #endif
553 	yylval.ptr = q;
554 	return STRING;
555 }
556 
557 void
558 config_vifs_from_file()
559 {
560 	extern FILE *f;
561 
562 	order = 0;
563 	numbounds = 0;
564 	lineno = 0;
565 
566 	if ((f = fopen(configfilename, "r")) == NULL) {
567 	    if (errno != ENOENT)
568 		logit(LOG_ERR, errno, "can't open %s", configfilename);
569 	    return;
570 	}
571 
572 	ifc.ifc_buf = (char *)ifbuf;
573 	ifc.ifc_len = sizeof(ifbuf);
574 	if (ioctl(udp_socket, SIOCGIFCONF, (char *)&ifc) < 0)
575 	    logit(LOG_ERR, errno, "ioctl SIOCGIFCONF");
576 
577 	yyparse();
578 
579 	fclose(f);
580 }
581 
582 static u_int32_t
583 valid_if(s)
584 char *s;
585 {
586 	vifi_t vifi;
587 	struct uvif *v;
588 
589 	for (vifi=0, v=uvifs; vifi<numvifs; vifi++, v++)
590 	    if (!strcmp(v->uv_name, s))
591 		return v->uv_lcl_addr;
592 
593 	return 0;
594 }
595 
596 static struct ifreq *
597 ifconfaddr(ifcp, a)
598     struct ifconf *ifcp;
599     u_int32_t a;
600 {
601     int n;
602     struct ifreq *ifrp = (struct ifreq *)ifcp->ifc_buf;
603     struct ifreq *ifend = (struct ifreq *)((char *)ifrp + ifcp->ifc_len);
604 
605     while (ifrp < ifend) {
606 	    if (ifrp->ifr_addr.sa_family == AF_INET &&
607 		((struct sockaddr_in *)&ifrp->ifr_addr)->sin_addr.s_addr == a)
608 		    return (ifrp);
609 #if (defined(BSD) && (BSD >= 199006))
610 		n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
611 		if (n < sizeof(*ifrp))
612 			++ifrp;
613 		else
614 			ifrp = (struct ifreq *)((char *)ifrp + n);
615 #else
616 		++ifrp;
617 #endif
618     }
619     return (0);
620 }
621