xref: /freebsd/usr.sbin/ypldap/parse.y (revision d6b92ffa) 
1 /*	$OpenBSD: parse.y,v 1.18 2015/01/16 06:40:22 deraadt Exp $	*/
2 /*	$FreeBSD$ */
3 
4 /*
5  * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
6  * Copyright (c) 2007, 2008 Reyk Floeter <reyk@openbsd.org>
7  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
8  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
9  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
10  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
11  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
12  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
13  *
14  * Permission to use, copy, modify, and distribute this software for any
15  * purpose with or without fee is hereby granted, provided that the above
16  * copyright notice and this permission notice appear in all copies.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
19  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
20  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
21  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
22  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
23  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
24  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
25  */
26 
27 %{
28 #include <sys/types.h>
29 #include <sys/param.h>
30 #include <sys/time.h>
31 #include <sys/queue.h>
32 #include <sys/tree.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 
36 #include <netinet/in.h>
37 #include <arpa/inet.h>
38 
39 #include <ctype.h>
40 #include <err.h>
41 #include <errno.h>
42 #include <event.h>
43 #include <fcntl.h>
44 #include <limits.h>
45 #include <netdb.h>
46 #include <pwd.h>
47 #include <stdarg.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <syslog.h>
52 #include <unistd.h>
53 
54 #include "ypldap.h"
55 
56 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
57 static struct file {
58 	TAILQ_ENTRY(file)	 entry;
59 	FILE			*stream;
60 	char			*name;
61 	int			 lineno;
62 	int			 errors;
63 } *file, *topfile;
64 struct file	*pushfile(const char *, int);
65 int		 popfile(void);
66 int		 check_file_secrecy(int, const char *);
67 int		 yyparse(void);
68 int		 yylex(void);
69 int		 yyerror(const char *, ...)
70     __attribute__((__format__ (printf, 1, 2)))
71     __attribute__((__nonnull__ (1)));
72 int		 kw_cmp(const void *, const void *);
73 int		 lookup(char *);
74 int		 lgetc(int);
75 int		 lungetc(int);
76 int		 findeol(void);
77 
78 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
79 struct sym {
80 	TAILQ_ENTRY(sym)	 entry;
81 	int			 used;
82 	int			 persist;
83 	char			*nam;
84 	char			*val;
85 };
86 int		 symset(const char *, const char *, int);
87 char		*symget(const char *);
88 
89 struct env		*conf = NULL;
90 struct idm		*idm = NULL;
91 static int		 errors = 0;
92 
93 typedef struct {
94 	union {
95 		int64_t		 number;
96 		char		*string;
97 	} v;
98 	int lineno;
99 } YYSTYPE;
100 
101 %}
102 
103 %token	SERVER FILTER ATTRIBUTE BASEDN BINDDN GROUPDN BINDCRED MAPS CHANGE DOMAIN PROVIDE
104 %token	USER GROUP TO EXPIRE HOME SHELL GECOS UID GID INTERVAL
105 %token	PASSWD NAME FIXED LIST GROUPNAME GROUPPASSWD GROUPGID MAP
106 %token	INCLUDE DIRECTORY CLASS PORT ERROR GROUPMEMBERS
107 %token	<v.string>	STRING
108 %token  <v.number>	NUMBER
109 %type	<v.number>	opcode attribute
110 %type	<v.string>	port
111 
112 %%
113 
114 grammar		: /* empty */
115 		| grammar '\n'
116 		| grammar include '\n'
117 		| grammar varset '\n'
118 		| grammar directory '\n'
119 		| grammar main '\n'
120 		| grammar error '\n'			{ file->errors++; }
121 		;
122 
123 nl		: '\n' optnl
124 		;
125 
126 optnl		: '\n' optnl
127 		| /* empty */
128 		;
129 
130 
131 include		: INCLUDE STRING			{
132 			struct file	*nfile;
133 
134 			if ((nfile = pushfile($2, 0)) == NULL) {
135 				yyerror("failed to include file %s", $2);
136 				free($2);
137 				YYERROR;
138 			}
139 			free($2);
140 
141 			file = nfile;
142 			lungetc('\n');
143 		}
144 		;
145 
146 varset		: STRING '=' STRING			{
147 			char *s = $1;
148 			while (*s++) {
149 				if (isspace((unsigned char) *s)) {
150 					yyerror("macro name cannot contain "
151 					  "whitespace");
152 					YYERROR;
153 				}
154 			}
155 			if (symset($1, $3, 0) == -1)
156 				fatal("cannot store variable");
157 			free($1);
158 			free($3);
159 		}
160 		;
161 
162 port		: /* empty */	{ $$ = NULL; }
163 		| PORT STRING	{ $$ = $2; }
164 		;
165 
166 opcode		: GROUP					{ $$ = 0; }
167 		| PASSWD				{ $$ = 1; }
168 		;
169 
170 
171 attribute	: NAME					{ $$ = 0; }
172 		| PASSWD				{ $$ = 1; }
173 		| UID					{ $$ = 2; }
174 		| GID					{ $$ = 3; }
175 		| CLASS					{ $$ = 4; }
176 		| CHANGE				{ $$ = 5; }
177 		| EXPIRE				{ $$ = 6; }
178 		| GECOS					{ $$ = 7; }
179 		| HOME					{ $$ = 8; }
180 		| SHELL					{ $$ = 9; }
181 		| GROUPNAME				{ $$ = 10; }
182 		| GROUPPASSWD				{ $$ = 11; }
183 		| GROUPGID				{ $$ = 12; }
184 		| GROUPMEMBERS				{ $$ = 13; }
185 		;
186 
187 diropt		: BINDDN STRING				{
188 			idm->idm_flags |= F_NEEDAUTH;
189 			if (strlcpy(idm->idm_binddn, $2,
190 			    sizeof(idm->idm_binddn)) >=
191 			    sizeof(idm->idm_binddn)) {
192 				yyerror("directory binddn truncated");
193 				free($2);
194 				YYERROR;
195 			}
196 			free($2);
197 		}
198 		| BINDCRED STRING			{
199 			idm->idm_flags |= F_NEEDAUTH;
200 			if (strlcpy(idm->idm_bindcred, $2,
201 			    sizeof(idm->idm_bindcred)) >=
202 			    sizeof(idm->idm_bindcred)) {
203 				yyerror("directory bindcred truncated");
204 				free($2);
205 				YYERROR;
206 			}
207 			free($2);
208 		}
209 		| BASEDN STRING			{
210 			if (strlcpy(idm->idm_basedn, $2,
211 			    sizeof(idm->idm_basedn)) >=
212 			    sizeof(idm->idm_basedn)) {
213 				yyerror("directory basedn truncated");
214 				free($2);
215 				YYERROR;
216 			}
217 			free($2);
218 		}
219 		| GROUPDN STRING		{
220 			if(strlcpy(idm->idm_groupdn, $2,
221 			    sizeof(idm->idm_groupdn)) >=
222 			    sizeof(idm->idm_groupdn)) {
223 				yyerror("directory groupdn truncated");
224 				free($2);
225 				YYERROR;
226 			}
227 			free($2);
228 		}
229 		| opcode FILTER STRING			{
230 			if (strlcpy(idm->idm_filters[$1], $3,
231 			    sizeof(idm->idm_filters[$1])) >=
232 			    sizeof(idm->idm_filters[$1])) {
233 				yyerror("filter truncated");
234 				free($3);
235 				YYERROR;
236 			}
237 			free($3);
238 		}
239 		| ATTRIBUTE attribute MAPS TO STRING	{
240 			if (strlcpy(idm->idm_attrs[$2], $5,
241 			    sizeof(idm->idm_attrs[$2])) >=
242 			    sizeof(idm->idm_attrs[$2])) {
243 				yyerror("attribute truncated");
244 				free($5);
245 				YYERROR;
246 			}
247 			free($5);
248 		}
249 		| FIXED ATTRIBUTE attribute STRING	{
250 			if (strlcpy(idm->idm_attrs[$3], $4,
251 			    sizeof(idm->idm_attrs[$3])) >=
252 			    sizeof(idm->idm_attrs[$3])) {
253 				yyerror("attribute truncated");
254 				free($4);
255 				YYERROR;
256 			}
257 			idm->idm_flags |= F_FIXED_ATTR($3);
258 			free($4);
259 		}
260 		| LIST attribute MAPS TO STRING	{
261 			if (strlcpy(idm->idm_attrs[$2], $5,
262 			    sizeof(idm->idm_attrs[$2])) >=
263 			    sizeof(idm->idm_attrs[$2])) {
264 				yyerror("attribute truncated");
265 				free($5);
266 				YYERROR;
267 			}
268 			idm->idm_list |= F_LIST($2);
269 			free($5);
270 		}
271 		;
272 
273 directory	: DIRECTORY STRING port {
274 			if ((idm = calloc(1, sizeof(*idm))) == NULL)
275 				fatal(NULL);
276 			idm->idm_id = conf->sc_maxid++;
277 
278 			if (strlcpy(idm->idm_name, $2,
279 			    sizeof(idm->idm_name)) >=
280 			    sizeof(idm->idm_name)) {
281 				yyerror("attribute truncated");
282 				free($2);
283 				YYERROR;
284 			}
285 
286 			free($2);
287 		} '{' optnl diropts '}'			{
288 			TAILQ_INSERT_TAIL(&conf->sc_idms, idm, idm_entry);
289 			idm = NULL;
290 		}
291 		;
292 
293 main		: INTERVAL NUMBER			{
294 			conf->sc_conf_tv.tv_sec = $2;
295 			conf->sc_conf_tv.tv_usec = 0;
296 		}
297 		| DOMAIN STRING				{
298 			if (strlcpy(conf->sc_domainname, $2,
299 			    sizeof(conf->sc_domainname)) >=
300 			    sizeof(conf->sc_domainname)) {
301 				yyerror("domainname truncated");
302 				free($2);
303 				YYERROR;
304 			}
305 			free($2);
306 		}
307 		| PROVIDE MAP STRING			{
308 			if (strcmp($3, "passwd.byname") == 0)
309 				conf->sc_flags |= YPMAP_PASSWD_BYNAME;
310 			else if (strcmp($3, "passwd.byuid") == 0)
311 				conf->sc_flags |= YPMAP_PASSWD_BYUID;
312 			else if (strcmp($3, "master.passwd.byname") == 0)
313 				conf->sc_flags |= YPMAP_MASTER_PASSWD_BYNAME;
314 			else if (strcmp($3, "master.passwd.byuid") == 0)
315 				conf->sc_flags |= YPMAP_MASTER_PASSWD_BYUID;
316 			else if (strcmp($3, "group.byname") == 0)
317 				conf->sc_flags |= YPMAP_GROUP_BYNAME;
318 			else if (strcmp($3, "group.bygid") == 0)
319 				conf->sc_flags |= YPMAP_GROUP_BYGID;
320 			else if (strcmp($3, "netid.byname") == 0)
321 				conf->sc_flags |= YPMAP_NETID_BYNAME;
322 			else {
323 				yyerror("unsupported map type: %s", $3);
324 				free($3);
325 				YYERROR;
326 			}
327 			free($3);
328 		}
329 		;
330 
331 diropts		: diropts diropt nl
332 		| diropt optnl
333 		;
334 
335 %%
336 
337 struct keywords {
338 	const char	*k_name;
339 	int		 k_val;
340 };
341 
342 int
343 yyerror(const char *fmt, ...)
344 {
345 	va_list		 ap;
346 	char		*msg;
347 
348 	file->errors++;
349 	va_start(ap, fmt);
350 	if (vasprintf(&msg, fmt, ap) == -1)
351 		fatalx("yyerror vasprintf");
352 	va_end(ap);
353 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
354 	free(msg);
355 	return (0);
356 }
357 
358 int
359 kw_cmp(const void *k, const void *e)
360 {
361 	return (strcmp(k, ((const struct keywords *)e)->k_name));
362 }
363 
364 int
365 lookup(char *s)
366 {
367 	/* this has to be sorted always */
368 	static const struct keywords keywords[] = {
369 		{ "attribute",		ATTRIBUTE },
370 		{ "basedn",		BASEDN },
371 		{ "bindcred",		BINDCRED },
372 		{ "binddn",		BINDDN },
373 		{ "change",		CHANGE },
374 		{ "class",		CLASS },
375 		{ "directory",		DIRECTORY },
376 		{ "domain",		DOMAIN },
377 		{ "expire",		EXPIRE },
378 		{ "filter",		FILTER },
379 		{ "fixed",		FIXED },
380 		{ "gecos",		GECOS },
381 		{ "gid",		GID },
382 		{ "group",		GROUP },
383 		{ "groupdn",		GROUPDN },
384 		{ "groupgid",		GROUPGID },
385 		{ "groupmembers",	GROUPMEMBERS },
386 		{ "groupname",		GROUPNAME },
387 		{ "grouppasswd",	GROUPPASSWD },
388 		{ "home",		HOME },
389 		{ "include",		INCLUDE },
390 		{ "interval",		INTERVAL },
391 		{ "list",		LIST },
392 		{ "map",		MAP },
393 		{ "maps",		MAPS },
394 		{ "name",		NAME },
395 		{ "passwd",		PASSWD },
396 		{ "port",		PORT },
397 		{ "provide",		PROVIDE },
398 		{ "server",		SERVER },
399 		{ "shell",		SHELL },
400 		{ "to",			TO },
401 		{ "uid",		UID },
402 		{ "user",		USER },
403 	};
404 	const struct keywords	*p;
405 
406 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
407 	    sizeof(keywords[0]), kw_cmp);
408 
409 	if (p)
410 		return (p->k_val);
411 	else
412 		return (STRING);
413 }
414 
415 #define MAXPUSHBACK	128
416 
417 u_char	*parsebuf;
418 int	 parseindex;
419 u_char	 pushback_buffer[MAXPUSHBACK];
420 int	 pushback_index = 0;
421 
422 int
423 lgetc(int quotec)
424 {
425 	int		c, next;
426 
427 	if (parsebuf) {
428 		/* Read character from the parsebuffer instead of input. */
429 		if (parseindex >= 0) {
430 			c = parsebuf[parseindex++];
431 			if (c != '\0')
432 				return (c);
433 			parsebuf = NULL;
434 		} else
435 			parseindex++;
436 	}
437 
438 	if (pushback_index)
439 		return (pushback_buffer[--pushback_index]);
440 
441 	if (quotec) {
442 		if ((c = getc(file->stream)) == EOF) {
443 			yyerror("reached end of file while parsing "
444 			    "quoted string");
445 			if (file == topfile || popfile() == EOF)
446 				return (EOF);
447 			return (quotec);
448 		}
449 		return (c);
450 	}
451 
452 	while ((c = getc(file->stream)) == '\\') {
453 		next = getc(file->stream);
454 		if (next != '\n') {
455 			c = next;
456 			break;
457 		}
458 		yylval.lineno = file->lineno;
459 		file->lineno++;
460 	}
461 
462 	while (c == EOF) {
463 		if (file == topfile || popfile() == EOF)
464 			return (EOF);
465 		c = getc(file->stream);
466 	}
467 	return (c);
468 }
469 
470 int
471 lungetc(int c)
472 {
473 	if (c == EOF)
474 		return (EOF);
475 	if (parsebuf) {
476 		parseindex--;
477 		if (parseindex >= 0)
478 			return (c);
479 	}
480 	if (pushback_index < MAXPUSHBACK-1)
481 		return (pushback_buffer[pushback_index++] = c);
482 	else
483 		return (EOF);
484 }
485 
486 int
487 findeol(void)
488 {
489 	int	c;
490 
491 	parsebuf = NULL;
492 
493 	/* skip to either EOF or the first real EOL */
494 	while (1) {
495 		if (pushback_index)
496 			c = pushback_buffer[--pushback_index];
497 		else
498 			c = lgetc(0);
499 		if (c == '\n') {
500 			file->lineno++;
501 			break;
502 		}
503 		if (c == EOF)
504 			break;
505 	}
506 	return (ERROR);
507 }
508 
509 int
510 yylex(void)
511 {
512 	u_char	 buf[8096];
513 	u_char	*p, *val;
514 	int	 quotec, next, c;
515 	int	 token;
516 
517 top:
518 	p = buf;
519 	while ((c = lgetc(0)) == ' ' || c == '\t')
520 		; /* nothing */
521 
522 	yylval.lineno = file->lineno;
523 	if (c == '#')
524 		while ((c = lgetc(0)) != '\n' && c != EOF)
525 			; /* nothing */
526 	if (c == '$' && parsebuf == NULL) {
527 		while (1) {
528 			if ((c = lgetc(0)) == EOF)
529 				return (0);
530 
531 			if (p + 1 >= buf + sizeof(buf) - 1) {
532 				yyerror("string too long");
533 				return (findeol());
534 			}
535 			if (isalnum(c) || c == '_') {
536 				*p++ = c;
537 				continue;
538 			}
539 			*p = '\0';
540 			lungetc(c);
541 			break;
542 		}
543 		val = symget(buf);
544 		if (val == NULL) {
545 			yyerror("macro '%s' not defined", buf);
546 			return (findeol());
547 		}
548 		parsebuf = val;
549 		parseindex = 0;
550 		goto top;
551 	}
552 
553 	switch (c) {
554 	case '\'':
555 	case '"':
556 		quotec = c;
557 		while (1) {
558 			if ((c = lgetc(quotec)) == EOF)
559 				return (0);
560 			if (c == '\n') {
561 				file->lineno++;
562 				continue;
563 			} else if (c == '\\') {
564 				if ((next = lgetc(quotec)) == EOF)
565 					return (0);
566 				if (next == quotec || c == ' ' || c == '\t')
567 					c = next;
568 				else if (next == '\n') {
569 					file->lineno++;
570 					continue;
571 				} else
572 					lungetc(next);
573 			} else if (c == quotec) {
574 				*p = '\0';
575 				break;
576 			} else if (c == '\0') {
577 				yyerror("syntax error");
578 				return (findeol());
579 			}
580 			if (p + 1 >= buf + sizeof(buf) - 1) {
581 				yyerror("string too long");
582 				return (findeol());
583 			}
584 			*p++ = c;
585 		}
586 		yylval.v.string = strdup(buf);
587 		if (yylval.v.string == NULL)
588 			err(1, "yylex: strdup");
589 		return (STRING);
590 	}
591 
592 #define allowed_to_end_number(x) \
593 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
594 
595 	if (c == '-' || isdigit(c)) {
596 		do {
597 			*p++ = c;
598 			if ((unsigned)(p-buf) >= sizeof(buf)) {
599 				yyerror("string too long");
600 				return (findeol());
601 			}
602 		} while ((c = lgetc(0)) != EOF && isdigit(c));
603 		lungetc(c);
604 		if (p == buf + 1 && buf[0] == '-')
605 			goto nodigits;
606 		if (c == EOF || allowed_to_end_number(c)) {
607 			const char *errstr = NULL;
608 
609 			*p = '\0';
610 			yylval.v.number = strtonum(buf, LLONG_MIN,
611 			    LLONG_MAX, &errstr);
612 			if (errstr) {
613 				yyerror("\"%s\" invalid number: %s",
614 				    buf, errstr);
615 				return (findeol());
616 			}
617 			return (NUMBER);
618 		} else {
619 nodigits:
620 			while (p > buf + 1)
621 				lungetc(*--p);
622 			c = *--p;
623 			if (c == '-')
624 				return (c);
625 		}
626 	}
627 
628 #define allowed_in_string(x) \
629 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
630 	x != '{' && x != '}' && x != '<' && x != '>' && \
631 	x != '!' && x != '=' && x != '#' && \
632 	x != ','))
633 
634 	if (isalnum(c) || c == ':' || c == '_') {
635 		do {
636 			*p++ = c;
637 			if ((unsigned)(p-buf) >= sizeof(buf)) {
638 				yyerror("string too long");
639 				return (findeol());
640 			}
641 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
642 		lungetc(c);
643 		*p = '\0';
644 		if ((token = lookup(buf)) == STRING)
645 			if ((yylval.v.string = strdup(buf)) == NULL)
646 				err(1, "yylex: strdup");
647 		return (token);
648 	}
649 	if (c == '\n') {
650 		yylval.lineno = file->lineno;
651 		file->lineno++;
652 	}
653 	if (c == EOF)
654 		return (0);
655 	return (c);
656 }
657 
658 int
659 check_file_secrecy(int fd, const char *fname)
660 {
661 	struct stat	st;
662 
663 	if (fstat(fd, &st)) {
664 		log_warn("cannot stat %s", fname);
665 		return (-1);
666 	}
667 	if (st.st_uid != 0 && st.st_uid != getuid()) {
668 		log_warnx("%s: owner not root or current user", fname);
669 		return (-1);
670 	}
671 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
672 		log_warnx("%s: group writable or world read/writable", fname);
673 		return (-1);
674 	}
675 	return (0);
676 }
677 
678 struct file *
679 pushfile(const char *name, int secret)
680 {
681 	struct file	*nfile;
682 
683 	if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
684 		log_warn("malloc");
685 		return (NULL);
686 	}
687 	if ((nfile->name = strdup(name)) == NULL) {
688 		log_warn("malloc");
689 		free(nfile);
690 		return (NULL);
691 	}
692 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
693 		log_warn("%s", nfile->name);
694 		free(nfile->name);
695 		free(nfile);
696 		return (NULL);
697 	} else if (secret &&
698 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
699 		fclose(nfile->stream);
700 		free(nfile->name);
701 		free(nfile);
702 		return (NULL);
703 	}
704 	nfile->lineno = 1;
705 	TAILQ_INSERT_TAIL(&files, nfile, entry);
706 	return (nfile);
707 }
708 
709 int
710 popfile(void)
711 {
712 	struct file	*prev;
713 
714 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
715 		prev->errors += file->errors;
716 
717 	TAILQ_REMOVE(&files, file, entry);
718 	fclose(file->stream);
719 	free(file->name);
720 	free(file);
721 	file = prev;
722 	return (file ? 0 : EOF);
723 }
724 
725 int
726 parse_config(struct env *x_conf, const char *filename, int opts)
727 {
728 	struct sym	*sym, *next;
729 
730 	conf = x_conf;
731 	bzero(conf, sizeof(*conf));
732 
733 	TAILQ_INIT(&conf->sc_idms);
734 	conf->sc_conf_tv.tv_sec = DEFAULT_INTERVAL;
735 	conf->sc_conf_tv.tv_usec = 0;
736 
737 	errors = 0;
738 
739 	if ((file = pushfile(filename, 1)) == NULL) {
740 		return (-1);
741 	}
742 	topfile = file;
743 
744 	/*
745 	 * parse configuration
746 	 */
747 	setservent(1);
748 	yyparse();
749 	endservent();
750 	errors = file->errors;
751 	popfile();
752 
753 	/* Free macros and check which have not been used. */
754 	for (sym = TAILQ_FIRST(&symhead); sym != NULL; sym = next) {
755 		next = TAILQ_NEXT(sym, entry);
756 		if ((opts & YPLDAP_OPT_VERBOSE) && !sym->used)
757 			fprintf(stderr, "warning: macro '%s' not "
758 			    "used\n", sym->nam);
759 		if (!sym->persist) {
760 			free(sym->nam);
761 			free(sym->val);
762 			TAILQ_REMOVE(&symhead, sym, entry);
763 			free(sym);
764 		}
765 	}
766 
767 	if (errors) {
768 		return (-1);
769 	}
770 
771 	return (0);
772 }
773 
774 int
775 symset(const char *nam, const char *val, int persist)
776 {
777 	struct sym	*sym;
778 
779 	for (sym = TAILQ_FIRST(&symhead); sym && strcmp(nam, sym->nam);
780 	    sym = TAILQ_NEXT(sym, entry))
781 		;	/* nothing */
782 
783 	if (sym != NULL) {
784 		if (sym->persist == 1)
785 			return (0);
786 		else {
787 			free(sym->nam);
788 			free(sym->val);
789 			TAILQ_REMOVE(&symhead, sym, entry);
790 			free(sym);
791 		}
792 	}
793 	if ((sym = calloc(1, sizeof(*sym))) == NULL)
794 		return (-1);
795 
796 	sym->nam = strdup(nam);
797 	if (sym->nam == NULL) {
798 		free(sym);
799 		return (-1);
800 	}
801 	sym->val = strdup(val);
802 	if (sym->val == NULL) {
803 		free(sym->nam);
804 		free(sym);
805 		return (-1);
806 	}
807 	sym->used = 0;
808 	sym->persist = persist;
809 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
810 	return (0);
811 }
812 
813 int
814 cmdline_symset(char *s)
815 {
816 	char	*sym, *val;
817 	int	ret;
818 	size_t	len;
819 
820 	if ((val = strrchr(s, '=')) == NULL)
821 		return (-1);
822 
823 	len = strlen(s) - strlen(val) + 1;
824 	if ((sym = malloc(len)) == NULL)
825 		errx(1, "cmdline_symset: malloc");
826 
827 	(void)strlcpy(sym, s, len);
828 
829 	ret = symset(sym, val + 1, 1);
830 	free(sym);
831 
832 	return (ret);
833 }
834 
835 char *
836 symget(const char *nam)
837 {
838 	struct sym	*sym;
839 
840 	TAILQ_FOREACH(sym, &symhead, entry)
841 		if (strcmp(nam, sym->nam) == 0) {
842 			sym->used = 1;
843 			return (sym->val);
844 		}
845 	return (NULL);
846 }
847