xref: /freebsd/usr.sbin/ypldap/parse.y (revision 1f4bcc459a76b7aa664f3fd557684cd0ba6da352) 
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 			if (symset($1, $3, 0) == -1)
148 				fatal("cannot store variable");
149 			free($1);
150 			free($3);
151 		}
152 		;
153 
154 port		: /* empty */	{ $$ = NULL; }
155 		| PORT STRING	{ $$ = $2; }
156 		;
157 
158 opcode		: GROUP					{ $$ = 0; }
159 		| PASSWD				{ $$ = 1; }
160 		;
161 
162 
163 attribute	: NAME					{ $$ = 0; }
164 		| PASSWD				{ $$ = 1; }
165 		| UID					{ $$ = 2; }
166 		| GID					{ $$ = 3; }
167 		| CLASS					{ $$ = 4; }
168 		| CHANGE				{ $$ = 5; }
169 		| EXPIRE				{ $$ = 6; }
170 		| GECOS					{ $$ = 7; }
171 		| HOME					{ $$ = 8; }
172 		| SHELL					{ $$ = 9; }
173 		| GROUPNAME				{ $$ = 10; }
174 		| GROUPPASSWD				{ $$ = 11; }
175 		| GROUPGID				{ $$ = 12; }
176 		| GROUPMEMBERS				{ $$ = 13; }
177 		;
178 
179 diropt		: BINDDN STRING				{
180 			idm->idm_flags |= F_NEEDAUTH;
181 			if (strlcpy(idm->idm_binddn, $2,
182 			    sizeof(idm->idm_binddn)) >=
183 			    sizeof(idm->idm_binddn)) {
184 				yyerror("directory binddn truncated");
185 				free($2);
186 				YYERROR;
187 			}
188 			free($2);
189 		}
190 		| BINDCRED STRING			{
191 			idm->idm_flags |= F_NEEDAUTH;
192 			if (strlcpy(idm->idm_bindcred, $2,
193 			    sizeof(idm->idm_bindcred)) >=
194 			    sizeof(idm->idm_bindcred)) {
195 				yyerror("directory bindcred truncated");
196 				free($2);
197 				YYERROR;
198 			}
199 			free($2);
200 		}
201 		| BASEDN STRING			{
202 			if (strlcpy(idm->idm_basedn, $2,
203 			    sizeof(idm->idm_basedn)) >=
204 			    sizeof(idm->idm_basedn)) {
205 				yyerror("directory basedn truncated");
206 				free($2);
207 				YYERROR;
208 			}
209 			free($2);
210 		}
211 		| GROUPDN STRING		{
212 			if(strlcpy(idm->idm_groupdn, $2,
213 			    sizeof(idm->idm_groupdn)) >=
214 			    sizeof(idm->idm_groupdn)) {
215 				yyerror("directory groupdn truncated");
216 				free($2);
217 				YYERROR;
218 			}
219 			free($2);
220 		}
221 		| opcode FILTER STRING			{
222 			if (strlcpy(idm->idm_filters[$1], $3,
223 			    sizeof(idm->idm_filters[$1])) >=
224 			    sizeof(idm->idm_filters[$1])) {
225 				yyerror("filter truncated");
226 				free($3);
227 				YYERROR;
228 			}
229 			free($3);
230 		}
231 		| ATTRIBUTE attribute MAPS TO STRING	{
232 			if (strlcpy(idm->idm_attrs[$2], $5,
233 			    sizeof(idm->idm_attrs[$2])) >=
234 			    sizeof(idm->idm_attrs[$2])) {
235 				yyerror("attribute truncated");
236 				free($5);
237 				YYERROR;
238 			}
239 			free($5);
240 		}
241 		| FIXED ATTRIBUTE attribute STRING	{
242 			if (strlcpy(idm->idm_attrs[$3], $4,
243 			    sizeof(idm->idm_attrs[$3])) >=
244 			    sizeof(idm->idm_attrs[$3])) {
245 				yyerror("attribute truncated");
246 				free($4);
247 				YYERROR;
248 			}
249 			idm->idm_flags |= F_FIXED_ATTR($3);
250 			free($4);
251 		}
252 		| LIST attribute MAPS TO STRING	{
253 			if (strlcpy(idm->idm_attrs[$2], $5,
254 			    sizeof(idm->idm_attrs[$2])) >=
255 			    sizeof(idm->idm_attrs[$2])) {
256 				yyerror("attribute truncated");
257 				free($5);
258 				YYERROR;
259 			}
260 			idm->idm_list |= F_LIST($2);
261 			free($5);
262 		}
263 		;
264 
265 directory	: DIRECTORY STRING port {
266 			if ((idm = calloc(1, sizeof(*idm))) == NULL)
267 				fatal(NULL);
268 			idm->idm_id = conf->sc_maxid++;
269 
270 			if (strlcpy(idm->idm_name, $2,
271 			    sizeof(idm->idm_name)) >=
272 			    sizeof(idm->idm_name)) {
273 				yyerror("attribute truncated");
274 				free($2);
275 				YYERROR;
276 			}
277 
278 			free($2);
279 		} '{' optnl diropts '}'			{
280 			TAILQ_INSERT_TAIL(&conf->sc_idms, idm, idm_entry);
281 			idm = NULL;
282 		}
283 		;
284 
285 main		: INTERVAL NUMBER			{
286 			conf->sc_conf_tv.tv_sec = $2;
287 			conf->sc_conf_tv.tv_usec = 0;
288 		}
289 		| DOMAIN STRING				{
290 			if (strlcpy(conf->sc_domainname, $2,
291 			    sizeof(conf->sc_domainname)) >=
292 			    sizeof(conf->sc_domainname)) {
293 				yyerror("domainname truncated");
294 				free($2);
295 				YYERROR;
296 			}
297 			free($2);
298 		}
299 		| PROVIDE MAP STRING			{
300 			if (strcmp($3, "passwd.byname") == 0)
301 				conf->sc_flags |= YPMAP_PASSWD_BYNAME;
302 			else if (strcmp($3, "passwd.byuid") == 0)
303 				conf->sc_flags |= YPMAP_PASSWD_BYUID;
304 			else if (strcmp($3, "master.passwd.byname") == 0)
305 				conf->sc_flags |= YPMAP_MASTER_PASSWD_BYNAME;
306 			else if (strcmp($3, "master.passwd.byuid") == 0)
307 				conf->sc_flags |= YPMAP_MASTER_PASSWD_BYUID;
308 			else if (strcmp($3, "group.byname") == 0)
309 				conf->sc_flags |= YPMAP_GROUP_BYNAME;
310 			else if (strcmp($3, "group.bygid") == 0)
311 				conf->sc_flags |= YPMAP_GROUP_BYGID;
312 			else if (strcmp($3, "netid.byname") == 0)
313 				conf->sc_flags |= YPMAP_NETID_BYNAME;
314 			else {
315 				yyerror("unsupported map type: %s", $3);
316 				free($3);
317 				YYERROR;
318 			}
319 			free($3);
320 		}
321 		;
322 
323 diropts		: diropts diropt nl
324 		| diropt optnl
325 		;
326 
327 %%
328 
329 struct keywords {
330 	const char	*k_name;
331 	int		 k_val;
332 };
333 
334 int
335 yyerror(const char *fmt, ...)
336 {
337 	va_list		 ap;
338 	char		*msg;
339 
340 	file->errors++;
341 	va_start(ap, fmt);
342 	if (vasprintf(&msg, fmt, ap) == -1)
343 		fatalx("yyerror vasprintf");
344 	va_end(ap);
345 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
346 	free(msg);
347 	return (0);
348 }
349 
350 int
351 kw_cmp(const void *k, const void *e)
352 {
353 	return (strcmp(k, ((const struct keywords *)e)->k_name));
354 }
355 
356 int
357 lookup(char *s)
358 {
359 	/* this has to be sorted always */
360 	static const struct keywords keywords[] = {
361 		{ "attribute",		ATTRIBUTE },
362 		{ "basedn",		BASEDN },
363 		{ "bindcred",		BINDCRED },
364 		{ "binddn",		BINDDN },
365 		{ "change",		CHANGE },
366 		{ "class",		CLASS },
367 		{ "directory",		DIRECTORY },
368 		{ "domain",		DOMAIN },
369 		{ "expire",		EXPIRE },
370 		{ "filter",		FILTER },
371 		{ "fixed",		FIXED },
372 		{ "gecos",		GECOS },
373 		{ "gid",		GID },
374 		{ "group",		GROUP },
375 		{ "groupdn",		GROUPDN },
376 		{ "groupgid",		GROUPGID },
377 		{ "groupmembers",	GROUPMEMBERS },
378 		{ "groupname",		GROUPNAME },
379 		{ "grouppasswd",	GROUPPASSWD },
380 		{ "home",		HOME },
381 		{ "include",		INCLUDE },
382 		{ "interval",		INTERVAL },
383 		{ "list",		LIST },
384 		{ "map",		MAP },
385 		{ "maps",		MAPS },
386 		{ "name",		NAME },
387 		{ "passwd",		PASSWD },
388 		{ "port",		PORT },
389 		{ "provide",		PROVIDE },
390 		{ "server",		SERVER },
391 		{ "shell",		SHELL },
392 		{ "to",			TO },
393 		{ "uid",		UID },
394 		{ "user",		USER },
395 	};
396 	const struct keywords	*p;
397 
398 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
399 	    sizeof(keywords[0]), kw_cmp);
400 
401 	if (p)
402 		return (p->k_val);
403 	else
404 		return (STRING);
405 }
406 
407 #define MAXPUSHBACK	128
408 
409 u_char	*parsebuf;
410 int	 parseindex;
411 u_char	 pushback_buffer[MAXPUSHBACK];
412 int	 pushback_index = 0;
413 
414 int
415 lgetc(int quotec)
416 {
417 	int		c, next;
418 
419 	if (parsebuf) {
420 		/* Read character from the parsebuffer instead of input. */
421 		if (parseindex >= 0) {
422 			c = parsebuf[parseindex++];
423 			if (c != '\0')
424 				return (c);
425 			parsebuf = NULL;
426 		} else
427 			parseindex++;
428 	}
429 
430 	if (pushback_index)
431 		return (pushback_buffer[--pushback_index]);
432 
433 	if (quotec) {
434 		if ((c = getc(file->stream)) == EOF) {
435 			yyerror("reached end of file while parsing "
436 			    "quoted string");
437 			if (file == topfile || popfile() == EOF)
438 				return (EOF);
439 			return (quotec);
440 		}
441 		return (c);
442 	}
443 
444 	while ((c = getc(file->stream)) == '\\') {
445 		next = getc(file->stream);
446 		if (next != '\n') {
447 			c = next;
448 			break;
449 		}
450 		yylval.lineno = file->lineno;
451 		file->lineno++;
452 	}
453 
454 	while (c == EOF) {
455 		if (file == topfile || popfile() == EOF)
456 			return (EOF);
457 		c = getc(file->stream);
458 	}
459 	return (c);
460 }
461 
462 int
463 lungetc(int c)
464 {
465 	if (c == EOF)
466 		return (EOF);
467 	if (parsebuf) {
468 		parseindex--;
469 		if (parseindex >= 0)
470 			return (c);
471 	}
472 	if (pushback_index < MAXPUSHBACK-1)
473 		return (pushback_buffer[pushback_index++] = c);
474 	else
475 		return (EOF);
476 }
477 
478 int
479 findeol(void)
480 {
481 	int	c;
482 
483 	parsebuf = NULL;
484 
485 	/* skip to either EOF or the first real EOL */
486 	while (1) {
487 		if (pushback_index)
488 			c = pushback_buffer[--pushback_index];
489 		else
490 			c = lgetc(0);
491 		if (c == '\n') {
492 			file->lineno++;
493 			break;
494 		}
495 		if (c == EOF)
496 			break;
497 	}
498 	return (ERROR);
499 }
500 
501 int
502 yylex(void)
503 {
504 	u_char	 buf[8096];
505 	u_char	*p, *val;
506 	int	 quotec, next, c;
507 	int	 token;
508 
509 top:
510 	p = buf;
511 	while ((c = lgetc(0)) == ' ' || c == '\t')
512 		; /* nothing */
513 
514 	yylval.lineno = file->lineno;
515 	if (c == '#')
516 		while ((c = lgetc(0)) != '\n' && c != EOF)
517 			; /* nothing */
518 	if (c == '$' && parsebuf == NULL) {
519 		while (1) {
520 			if ((c = lgetc(0)) == EOF)
521 				return (0);
522 
523 			if (p + 1 >= buf + sizeof(buf) - 1) {
524 				yyerror("string too long");
525 				return (findeol());
526 			}
527 			if (isalnum(c) || c == '_') {
528 				*p++ = c;
529 				continue;
530 			}
531 			*p = '\0';
532 			lungetc(c);
533 			break;
534 		}
535 		val = symget(buf);
536 		if (val == NULL) {
537 			yyerror("macro '%s' not defined", buf);
538 			return (findeol());
539 		}
540 		parsebuf = val;
541 		parseindex = 0;
542 		goto top;
543 	}
544 
545 	switch (c) {
546 	case '\'':
547 	case '"':
548 		quotec = c;
549 		while (1) {
550 			if ((c = lgetc(quotec)) == EOF)
551 				return (0);
552 			if (c == '\n') {
553 				file->lineno++;
554 				continue;
555 			} else if (c == '\\') {
556 				if ((next = lgetc(quotec)) == EOF)
557 					return (0);
558 				if (next == quotec || c == ' ' || c == '\t')
559 					c = next;
560 				else if (next == '\n') {
561 					file->lineno++;
562 					continue;
563 				} else
564 					lungetc(next);
565 			} else if (c == quotec) {
566 				*p = '\0';
567 				break;
568 			} else if (c == '\0') {
569 				yyerror("syntax error");
570 				return (findeol());
571 			}
572 			if (p + 1 >= buf + sizeof(buf) - 1) {
573 				yyerror("string too long");
574 				return (findeol());
575 			}
576 			*p++ = c;
577 		}
578 		yylval.v.string = strdup(buf);
579 		if (yylval.v.string == NULL)
580 			err(1, "yylex: strdup");
581 		return (STRING);
582 	}
583 
584 #define allowed_to_end_number(x) \
585 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
586 
587 	if (c == '-' || isdigit(c)) {
588 		do {
589 			*p++ = c;
590 			if ((unsigned)(p-buf) >= sizeof(buf)) {
591 				yyerror("string too long");
592 				return (findeol());
593 			}
594 		} while ((c = lgetc(0)) != EOF && isdigit(c));
595 		lungetc(c);
596 		if (p == buf + 1 && buf[0] == '-')
597 			goto nodigits;
598 		if (c == EOF || allowed_to_end_number(c)) {
599 			const char *errstr = NULL;
600 
601 			*p = '\0';
602 			yylval.v.number = strtonum(buf, LLONG_MIN,
603 			    LLONG_MAX, &errstr);
604 			if (errstr) {
605 				yyerror("\"%s\" invalid number: %s",
606 				    buf, errstr);
607 				return (findeol());
608 			}
609 			return (NUMBER);
610 		} else {
611 nodigits:
612 			while (p > buf + 1)
613 				lungetc(*--p);
614 			c = *--p;
615 			if (c == '-')
616 				return (c);
617 		}
618 	}
619 
620 #define allowed_in_string(x) \
621 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
622 	x != '{' && x != '}' && x != '<' && x != '>' && \
623 	x != '!' && x != '=' && x != '#' && \
624 	x != ','))
625 
626 	if (isalnum(c) || c == ':' || c == '_') {
627 		do {
628 			*p++ = c;
629 			if ((unsigned)(p-buf) >= sizeof(buf)) {
630 				yyerror("string too long");
631 				return (findeol());
632 			}
633 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
634 		lungetc(c);
635 		*p = '\0';
636 		if ((token = lookup(buf)) == STRING)
637 			if ((yylval.v.string = strdup(buf)) == NULL)
638 				err(1, "yylex: strdup");
639 		return (token);
640 	}
641 	if (c == '\n') {
642 		yylval.lineno = file->lineno;
643 		file->lineno++;
644 	}
645 	if (c == EOF)
646 		return (0);
647 	return (c);
648 }
649 
650 int
651 check_file_secrecy(int fd, const char *fname)
652 {
653 	struct stat	st;
654 
655 	if (fstat(fd, &st)) {
656 		log_warn("cannot stat %s", fname);
657 		return (-1);
658 	}
659 	if (st.st_uid != 0 && st.st_uid != getuid()) {
660 		log_warnx("%s: owner not root or current user", fname);
661 		return (-1);
662 	}
663 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
664 		log_warnx("%s: group writable or world read/writable", fname);
665 		return (-1);
666 	}
667 	return (0);
668 }
669 
670 struct file *
671 pushfile(const char *name, int secret)
672 {
673 	struct file	*nfile;
674 
675 	if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
676 		log_warn("malloc");
677 		return (NULL);
678 	}
679 	if ((nfile->name = strdup(name)) == NULL) {
680 		log_warn("malloc");
681 		free(nfile);
682 		return (NULL);
683 	}
684 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
685 		log_warn("%s", nfile->name);
686 		free(nfile->name);
687 		free(nfile);
688 		return (NULL);
689 	} else if (secret &&
690 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
691 		fclose(nfile->stream);
692 		free(nfile->name);
693 		free(nfile);
694 		return (NULL);
695 	}
696 	nfile->lineno = 1;
697 	TAILQ_INSERT_TAIL(&files, nfile, entry);
698 	return (nfile);
699 }
700 
701 int
702 popfile(void)
703 {
704 	struct file	*prev;
705 
706 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
707 		prev->errors += file->errors;
708 
709 	TAILQ_REMOVE(&files, file, entry);
710 	fclose(file->stream);
711 	free(file->name);
712 	free(file);
713 	file = prev;
714 	return (file ? 0 : EOF);
715 }
716 
717 int
718 parse_config(struct env *x_conf, const char *filename, int opts)
719 {
720 	struct sym	*sym, *next;
721 
722 	conf = x_conf;
723 	bzero(conf, sizeof(*conf));
724 
725 	TAILQ_INIT(&conf->sc_idms);
726 	conf->sc_conf_tv.tv_sec = DEFAULT_INTERVAL;
727 	conf->sc_conf_tv.tv_usec = 0;
728 
729 	errors = 0;
730 
731 	if ((file = pushfile(filename, 1)) == NULL) {
732 		return (-1);
733 	}
734 	topfile = file;
735 
736 	/*
737 	 * parse configuration
738 	 */
739 	setservent(1);
740 	yyparse();
741 	endservent();
742 	errors = file->errors;
743 	popfile();
744 
745 	/* Free macros and check which have not been used. */
746 	for (sym = TAILQ_FIRST(&symhead); sym != NULL; sym = next) {
747 		next = TAILQ_NEXT(sym, entry);
748 		if ((opts & YPLDAP_OPT_VERBOSE) && !sym->used)
749 			fprintf(stderr, "warning: macro '%s' not "
750 			    "used\n", sym->nam);
751 		if (!sym->persist) {
752 			free(sym->nam);
753 			free(sym->val);
754 			TAILQ_REMOVE(&symhead, sym, entry);
755 			free(sym);
756 		}
757 	}
758 
759 	if (errors) {
760 		return (-1);
761 	}
762 
763 	return (0);
764 }
765 
766 int
767 symset(const char *nam, const char *val, int persist)
768 {
769 	struct sym	*sym;
770 
771 	for (sym = TAILQ_FIRST(&symhead); sym && strcmp(nam, sym->nam);
772 	    sym = TAILQ_NEXT(sym, entry))
773 		;	/* nothing */
774 
775 	if (sym != NULL) {
776 		if (sym->persist == 1)
777 			return (0);
778 		else {
779 			free(sym->nam);
780 			free(sym->val);
781 			TAILQ_REMOVE(&symhead, sym, entry);
782 			free(sym);
783 		}
784 	}
785 	if ((sym = calloc(1, sizeof(*sym))) == NULL)
786 		return (-1);
787 
788 	sym->nam = strdup(nam);
789 	if (sym->nam == NULL) {
790 		free(sym);
791 		return (-1);
792 	}
793 	sym->val = strdup(val);
794 	if (sym->val == NULL) {
795 		free(sym->nam);
796 		free(sym);
797 		return (-1);
798 	}
799 	sym->used = 0;
800 	sym->persist = persist;
801 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
802 	return (0);
803 }
804 
805 int
806 cmdline_symset(char *s)
807 {
808 	char	*sym, *val;
809 	int	ret;
810 	size_t	len;
811 
812 	if ((val = strrchr(s, '=')) == NULL)
813 		return (-1);
814 
815 	len = strlen(s) - strlen(val) + 1;
816 	if ((sym = malloc(len)) == NULL)
817 		errx(1, "cmdline_symset: malloc");
818 
819 	(void)strlcpy(sym, s, len);
820 
821 	ret = symset(sym, val + 1, 1);
822 	free(sym);
823 
824 	return (ret);
825 }
826 
827 char *
828 symget(const char *nam)
829 {
830 	struct sym	*sym;
831 
832 	TAILQ_FOREACH(sym, &symhead, entry)
833 		if (strcmp(nam, sym->nam) == 0) {
834 			sym->used = 1;
835 			return (sym->val);
836 		}
837 	return (NULL);
838 }
839