cfparse.y revision 1.13 1 %{
2 /* $NetBSD: cfparse.y,v 1.13 2003/05/16 22:59:50 dsl 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 = malloc(strlen($2) + 1);
210 strcpy(boundlist[numbounds].name, $2);
211 boundlist[numbounds++].bound = $3;
212 }
213 | SYSNAM STRING {
214 #ifdef SNMP
215 set_sysName($2);
216 #endif /* SNMP */
217 }
218 | SYSCONTACT STRING {
219 #ifdef SNMP
220 set_sysContact($2);
221 #endif /* SNMP */
222 }
223 | SYSVERSION STRING {
224 #ifdef SNMP
225 set_sysVersion($2);
226 #endif /* SNMP */
227 }
228 | SYSLOCATION STRING {
229 #ifdef SNMP
230 set_sysLocation($2);
231 #endif /* SNMP */
232 }
233 ;
234
235 tunnelmods : /* empty */
236 | tunnelmods tunnelmod
237 ;
238
239 tunnelmod : mod
240 | SRCRT { fatal("Source-route tunnels not supported"); }
241 ;
242
243 ifmods : /* empty */
244 | ifmods ifmod
245 ;
246
247 ifmod : mod
248 | DISABLE { v->uv_flags |= VIFF_DISABLED; }
249 | IGMPV1 { v->uv_flags |= VIFF_IGMPV1; }
250 | NETMASK addrname {
251 u_int32_t subnet, mask;
252
253 mask = $2;
254 subnet = v->uv_lcl_addr & mask;
255 if (!inet_valid_subnet(subnet, mask))
256 fatal("Invalid netmask");
257 v->uv_subnet = subnet;
258 v->uv_subnetmask = mask;
259 v->uv_subnetbcast = subnet | ~mask;
260 }
261 | NETMASK {
262
263 warn("Expected address after netmask keyword, ignored");
264
265 }
266 | ALTNET addrmask {
267
268 struct phaddr *ph;
269
270 ph = (struct phaddr *)malloc(sizeof(struct phaddr));
271 if (ph == NULL)
272 fatal("out of memory");
273 if ($2.mask) {
274 VAL_TO_MASK(ph->pa_subnetmask, $2.mask);
275 } else
276 ph->pa_subnetmask = v->uv_subnetmask;
277 ph->pa_subnet = $2.addr & ph->pa_subnetmask;
278 ph->pa_subnetbcast = ph->pa_subnet | ~ph->pa_subnetmask;
279 if ($2.addr & ~ph->pa_subnetmask)
280 warn("Extra subnet %s/%d has host bits set",
281 inet_fmt($2.addr), $2.mask);
282 ph->pa_next = v->uv_addrs;
283 v->uv_addrs = ph;
284
285 }
286 | ALTNET {
287
288 warn("Expected address after altnet keyword, ignored");
289
290 }
291 ;
292
293 mod : THRESHOLD NUMBER { if ($2 < 1 || $2 > 255)
294 fatal("Invalid threshold %d",$2);
295 v->uv_threshold = $2;
296 }
297 | THRESHOLD {
298
299 warn("Expected number after threshold keyword, ignored");
300
301 }
302 | METRIC NUMBER { if ($2 < 1 || $2 > UNREACHABLE)
303 fatal("Invalid metric %d",$2);
304 v->uv_metric = $2;
305 }
306 | METRIC {
307
308 warn("Expected number after metric keyword, ignored");
309
310 }
311 | RATE_LIMIT NUMBER { if ($2 > MAX_RATE_LIMIT)
312 fatal("Invalid rate_limit %d",$2);
313 v->uv_rate_limit = $2;
314 }
315 | RATE_LIMIT {
316
317 warn("Expected number after rate_limit keyword, ignored");
318
319 }
320 | BOUNDARY bound {
321
322 struct vif_acl *v_acl;
323
324 v_acl = (struct vif_acl *)malloc(sizeof(struct vif_acl));
325 if (v_acl == NULL)
326 fatal("out of memory");
327 VAL_TO_MASK(v_acl->acl_mask, $2.mask);
328 v_acl->acl_addr = $2.addr & v_acl->acl_mask;
329 if ($2.addr & ~v_acl->acl_mask)
330 warn("Boundary spec %s/%d has host bits set",
331 inet_fmt($2.addr),$2.mask);
332 v_acl->acl_next = v->uv_acl;
333 v->uv_acl = v_acl;
334
335 }
336 | BOUNDARY {
337
338 warn("Expected boundary spec after boundary keyword, ignored");
339
340 }
341 ;
342
343 interface : ADDR { $$ = $1; }
344 | STRING {
345 $$ = valid_if($1);
346 if ($$ == 0)
347 fatal("Invalid interface name %s",$1);
348 }
349 ;
350
351 addrname : ADDR { $$ = $1; }
352 | STRING { struct hostent *hp;
353
354 if ((hp = gethostbyname($1)) == NULL)
355 fatal("No such host %s", $1);
356
357 if (hp->h_addr_list[1])
358 fatal("Hostname %s does not %s",
359 $1, "map to a unique address");
360
361 bcopy(hp->h_addr_list[0], &$$,
362 hp->h_length);
363 }
364
365 bound : boundary { $$ = $1; }
366 | STRING { int i;
367
368 for (i=0; i < numbounds; i++) {
369 if (!strcmp(boundlist[i].name, $1)) {
370 $$ = boundlist[i].bound;
371 break;
372 }
373 }
374 if (i == numbounds) {
375 fatal("Invalid boundary name %s",$1);
376 }
377 }
378 ;
379
380 boundary : ADDRMASK {
381
382 if ((ntohl($1.addr) & 0xff000000) != 0xef000000) {
383 fatal("Boundaries must be 239.x.x.x, not %s/%d",
384 inet_fmt($1.addr), $1.mask);
385 }
386 $$ = $1;
387
388 }
389 ;
390
391 addrmask : ADDRMASK { $$ = $1; }
392 | ADDR { $$.addr = $1; $$.mask = 0; }
393 ;
394 %%
395 static void
396 fatal(char *fmt, ...)
397 {
398 va_list ap;
399 char buf[200];
400
401 va_start(ap, fmt);
402 vsnprintf(buf, sizeof(buf), fmt, ap);
403 va_end(ap);
404
405 logit(LOG_ERR,0,"%s: %s near line %d", configfilename, buf, lineno);
406 }
407
408 static void
409 warn(char *fmt, ...)
410 {
411 va_list ap;
412 char buf[200];
413
414 va_start(ap, fmt);
415 vsnprintf(buf, sizeof(buf), fmt, ap);
416 va_end(ap);
417
418 logit(LOG_WARNING,0,"%s: %s near line %d", configfilename, buf, lineno);
419 }
420
421 static void
422 yyerror(s)
423 char *s;
424 {
425 logit(LOG_ERR, 0, "%s: %s near line %d", configfilename, s, lineno);
426 }
427
428 static char *
429 next_word()
430 {
431 static char buf[1024];
432 static char *p=NULL;
433 extern FILE *f;
434 char *q;
435
436 while (1) {
437 if (!p || !*p) {
438 lineno++;
439 if (fgets(buf, sizeof(buf), f) == NULL)
440 return NULL;
441 p = buf;
442 }
443 while (*p && (*p == ' ' || *p == '\t')) /* skip whitespace */
444 p++;
445 if (*p == '#') {
446 p = NULL; /* skip comments */
447 continue;
448 }
449 q = p;
450 #ifdef SNMP
451 if (*p == '"') {
452 p++;
453 while (*p && *p != '"' && *p != '\n')
454 p++; /* find next whitespace */
455 if (*p == '"')
456 p++;
457 } else
458 #endif
459 while (*p && *p != ' ' && *p != '\t' && *p != '\n')
460 p++; /* find next whitespace */
461 *p++ = '\0'; /* null-terminate string */
462
463 if (!*q) {
464 p = NULL;
465 continue; /* if 0-length string, read another line */
466 }
467
468 return q;
469 }
470 }
471
472 static int
473 yylex()
474 {
475 int n;
476 u_int32_t addr;
477 char *q;
478 char c;
479
480 if ((q = next_word()) == NULL) {
481 return 0;
482 }
483
484 if (!strcmp(q,"cache_lifetime"))
485 return CACHE_LIFETIME;
486 if (!strcmp(q,"pruning"))
487 return PRUNING;
488 if (!strcmp(q,"phyint"))
489 return PHYINT;
490 if (!strcmp(q,"tunnel"))
491 return TUNNEL;
492 if (!strcmp(q,"disable"))
493 return DISABLE;
494 if (!strcmp(q,"metric"))
495 return METRIC;
496 if (!strcmp(q,"threshold"))
497 return THRESHOLD;
498 if (!strcmp(q,"rate_limit"))
499 return RATE_LIMIT;
500 if (!strcmp(q,"srcrt") || !strcmp(q,"sourceroute"))
501 return SRCRT;
502 if (!strcmp(q,"boundary"))
503 return BOUNDARY;
504 if (!strcmp(q,"netmask"))
505 return NETMASK;
506 if (!strcmp(q,"igmpv1"))
507 return IGMPV1;
508 if (!strcmp(q,"altnet"))
509 return ALTNET;
510 if (!strcmp(q,"name"))
511 return NAME;
512 if (!strcmp(q,"on") || !strcmp(q,"yes")) {
513 yylval.num = 1;
514 return BOOLEAN;
515 }
516 if (!strcmp(q,"off") || !strcmp(q,"no")) {
517 yylval.num = 0;
518 return BOOLEAN;
519 }
520 if ((addr = inet_parse(q, &n)) != 0xffffffff) {
521 yylval.addrmask.mask = n;
522 yylval.addrmask.addr = addr;
523 return ADDRMASK;
524 }
525 if ((addr = inet_parse(q,0)) != 0xffffffff &&
526 inet_valid_host(addr)) {
527 yylval.addr = addr;
528 return ADDR;
529 }
530 if (sscanf(q,"0x%8x%c",&n,&c) == 1) {
531 yylval.addr = n;
532 return ADDR;
533 }
534 if (sscanf(q,"%d%c",&n,&c) == 1) {
535 yylval.num = n;
536 return NUMBER;
537 }
538 #ifdef SNMP
539 if (!strcmp(q,"sysName"))
540 return SYSNAM;
541 if (!strcmp(q,"sysContact"))
542 return SYSCONTACT;
543 if (!strcmp(q,"sysVersion"))
544 return SYSVERSION;
545 if (!strcmp(q,"sysLocation"))
546 return SYSLOCATION;
547 if (*q=='"') {
548 if (q[ strlen(q)-1 ]=='"')
549 q[ strlen(q)-1 ]='\0'; /* trash trailing quote */
550 yylval.ptr = q+1;
551 return STRING;
552 }
553 #endif
554 yylval.ptr = q;
555 return STRING;
556 }
557
558 void
559 config_vifs_from_file()
560 {
561 extern FILE *f;
562
563 order = 0;
564 numbounds = 0;
565 lineno = 0;
566
567 if ((f = fopen(configfilename, "r")) == NULL) {
568 if (errno != ENOENT)
569 logit(LOG_ERR, errno, "can't open %s", configfilename);
570 return;
571 }
572
573 ifc.ifc_buf = (char *)ifbuf;
574 ifc.ifc_len = sizeof(ifbuf);
575 if (ioctl(udp_socket, SIOCGIFCONF, (char *)&ifc) < 0)
576 logit(LOG_ERR, errno, "ioctl SIOCGIFCONF");
577
578 yyparse();
579
580 fclose(f);
581 }
582
583 static u_int32_t
584 valid_if(s)
585 char *s;
586 {
587 vifi_t vifi;
588 struct uvif *v;
589
590 for (vifi=0, v=uvifs; vifi<numvifs; vifi++, v++)
591 if (!strcmp(v->uv_name, s))
592 return v->uv_lcl_addr;
593
594 return 0;
595 }
596
597 static struct ifreq *
598 ifconfaddr(ifcp, a)
599 struct ifconf *ifcp;
600 u_int32_t a;
601 {
602 int n;
603 struct ifreq *ifrp = (struct ifreq *)ifcp->ifc_buf;
604 struct ifreq *ifend = (struct ifreq *)((char *)ifrp + ifcp->ifc_len);
605
606 while (ifrp < ifend) {
607 if (ifrp->ifr_addr.sa_family == AF_INET &&
608 ((struct sockaddr_in *)&ifrp->ifr_addr)->sin_addr.s_addr == a)
609 return (ifrp);
610 #if (defined(BSD) && (BSD >= 199006))
611 n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
612 if (n < sizeof(*ifrp))
613 ++ifrp;
614 else
615 ifrp = (struct ifreq *)((char *)ifrp + n);
616 #else
617 ++ifrp;
618 #endif
619 }
620 return (0);
621 }
622