xref: /openbsd/usr.sbin/ypldap/parse.y (revision a6445c1d) 
1 /*	$OpenBSD: parse.y,v 1.17 2014/11/20 05:51:21 jsg Exp $	*/
2 
3 /*
4  * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
5  * Copyright (c) 2007, 2008 Reyk Floeter <reyk@openbsd.org>
6  * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
7  * Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
8  * Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
9  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
10  * Copyright (c) 2001 Daniel Hartmeier.  All rights reserved.
11  * Copyright (c) 2001 Theo de Raadt.  All rights reserved.
12  *
13  * Permission to use, copy, modify, and distribute this software for any
14  * purpose with or without fee is hereby granted, provided that the above
15  * copyright notice and this permission notice appear in all copies.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
18  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
20  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
21  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
22  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
23  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24  */
25 
26 %{
27 #include <sys/types.h>
28 #include <sys/time.h>
29 #include <sys/queue.h>
30 #include <sys/tree.h>
31 #include <sys/param.h>
32 #include <sys/socket.h>
33 #include <sys/stat.h>
34 
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
37 
38 #include <ctype.h>
39 #include <err.h>
40 #include <errno.h>
41 #include <event.h>
42 #include <fcntl.h>
43 #include <limits.h>
44 #include <netdb.h>
45 #include <pwd.h>
46 #include <stdarg.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <syslog.h>
51 #include <unistd.h>
52 
53 #include "ypldap.h"
54 
55 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
56 static struct file {
57 	TAILQ_ENTRY(file)	 entry;
58 	FILE			*stream;
59 	char			*name;
60 	int			 lineno;
61 	int			 errors;
62 } *file, *topfile;
63 struct file	*pushfile(const char *, int);
64 int		 popfile(void);
65 int		 check_file_secrecy(int, const char *);
66 int		 yyparse(void);
67 int		 yylex(void);
68 int		 yyerror(const char *, ...)
69     __attribute__((__format__ (printf, 1, 2)))
70     __attribute__((__nonnull__ (1)));
71 int		 kw_cmp(const void *, const void *);
72 int		 lookup(char *);
73 int		 lgetc(int);
74 int		 lungetc(int);
75 int		 findeol(void);
76 
77 TAILQ_HEAD(symhead, sym)	 symhead = TAILQ_HEAD_INITIALIZER(symhead);
78 struct sym {
79 	TAILQ_ENTRY(sym)	 entry;
80 	int			 used;
81 	int			 persist;
82 	char			*nam;
83 	char			*val;
84 };
85 int		 symset(const char *, const char *, int);
86 char		*symget(const char *);
87 
88 struct env		*conf = NULL;
89 struct idm		*idm = NULL;
90 static int		 errors = 0;
91 
92 typedef struct {
93 	union {
94 		int64_t		 number;
95 		char		*string;
96 	} v;
97 	int lineno;
98 } YYSTYPE;
99 
100 %}
101 
102 %token	SERVER FILTER ATTRIBUTE BASEDN BINDDN GROUPDN BINDCRED MAPS CHANGE DOMAIN PROVIDE
103 %token	USER GROUP TO EXPIRE HOME SHELL GECOS UID GID INTERVAL
104 %token	PASSWD NAME FIXED LIST GROUPNAME GROUPPASSWD GROUPGID MAP
105 %token	INCLUDE DIRECTORY CLASS PORT ERROR GROUPMEMBERS
106 %token	<v.string>	STRING
107 %token  <v.number>	NUMBER
108 %type	<v.number>	opcode attribute
109 %type	<v.string>	port
110 
111 %%
112 
113 grammar		: /* empty */
114 		| grammar '\n'
115 		| grammar include '\n'
116 		| grammar varset '\n'
117 		| grammar directory '\n'
118 		| grammar main '\n'
119 		| grammar error '\n'			{ file->errors++; }
120 		;
121 
122 nl		: '\n' optnl
123 		;
124 
125 optnl		: '\n' optnl
126 		| /* empty */
127 		;
128 
129 
130 include		: INCLUDE STRING			{
131 			struct file	*nfile;
132 
133 			if ((nfile = pushfile($2, 0)) == NULL) {
134 				yyerror("failed to include file %s", $2);
135 				free($2);
136 				YYERROR;
137 			}
138 			free($2);
139 
140 			file = nfile;
141 			lungetc('\n');
142 		}
143 		;
144 
145 varset		: STRING '=' STRING			{
146 			if (symset($1, $3, 0) == -1)
147 				fatal("cannot store variable");
148 			free($1);
149 			free($3);
150 		}
151 		;
152 
153 port		: /* empty */	{ $$ = NULL; }
154 		| PORT STRING	{ $$ = $2; }
155 		;
156 
157 opcode		: GROUP					{ $$ = 0; }
158 		| PASSWD				{ $$ = 1; }
159 		;
160 
161 
162 attribute	: NAME					{ $$ = 0; }
163 		| PASSWD				{ $$ = 1; }
164 		| UID					{ $$ = 2; }
165 		| GID					{ $$ = 3; }
166 		| CLASS					{ $$ = 4; }
167 		| CHANGE				{ $$ = 5; }
168 		| EXPIRE				{ $$ = 6; }
169 		| GECOS					{ $$ = 7; }
170 		| HOME					{ $$ = 8; }
171 		| SHELL					{ $$ = 9; }
172 		| GROUPNAME				{ $$ = 10; }
173 		| GROUPPASSWD				{ $$ = 11; }
174 		| GROUPGID				{ $$ = 12; }
175 		| GROUPMEMBERS				{ $$ = 13; }
176 		;
177 
178 diropt		: BINDDN STRING				{
179 			idm->idm_flags |= F_NEEDAUTH;
180 			if (strlcpy(idm->idm_binddn, $2,
181 			    sizeof(idm->idm_binddn)) >=
182 			    sizeof(idm->idm_binddn)) {
183 				yyerror("directory binddn truncated");
184 				free($2);
185 				YYERROR;
186 			}
187 			free($2);
188 		}
189 		| BINDCRED STRING			{
190 			idm->idm_flags |= F_NEEDAUTH;
191 			if (strlcpy(idm->idm_bindcred, $2,
192 			    sizeof(idm->idm_bindcred)) >=
193 			    sizeof(idm->idm_bindcred)) {
194 				yyerror("directory bindcred truncated");
195 				free($2);
196 				YYERROR;
197 			}
198 			free($2);
199 		}
200 		| BASEDN STRING			{
201 			if (strlcpy(idm->idm_basedn, $2,
202 			    sizeof(idm->idm_basedn)) >=
203 			    sizeof(idm->idm_basedn)) {
204 				yyerror("directory basedn truncated");
205 				free($2);
206 				YYERROR;
207 			}
208 			free($2);
209 		}
210 		| GROUPDN STRING		{
211 			if(strlcpy(idm->idm_groupdn, $2,
212 			    sizeof(idm->idm_groupdn)) >=
213 			    sizeof(idm->idm_groupdn)) {
214 				yyerror("directory groupdn truncated");
215 				free($2);
216 				YYERROR;
217 			}
218 			free($2);
219 		}
220 		| opcode FILTER STRING			{
221 			if (strlcpy(idm->idm_filters[$1], $3,
222 			    sizeof(idm->idm_filters[$1])) >=
223 			    sizeof(idm->idm_filters[$1])) {
224 				yyerror("filter truncated");
225 				free($3);
226 				YYERROR;
227 			}
228 			free($3);
229 		}
230 		| ATTRIBUTE attribute MAPS TO STRING	{
231 			if (strlcpy(idm->idm_attrs[$2], $5,
232 			    sizeof(idm->idm_attrs[$2])) >=
233 			    sizeof(idm->idm_attrs[$2])) {
234 				yyerror("attribute truncated");
235 				free($5);
236 				YYERROR;
237 			}
238 			free($5);
239 		}
240 		| FIXED ATTRIBUTE attribute STRING	{
241 			if (strlcpy(idm->idm_attrs[$3], $4,
242 			    sizeof(idm->idm_attrs[$3])) >=
243 			    sizeof(idm->idm_attrs[$3])) {
244 				yyerror("attribute truncated");
245 				free($4);
246 				YYERROR;
247 			}
248 			idm->idm_flags |= F_FIXED_ATTR($3);
249 			free($4);
250 		}
251 		| LIST attribute MAPS TO STRING	{
252 			if (strlcpy(idm->idm_attrs[$2], $5,
253 			    sizeof(idm->idm_attrs[$2])) >=
254 			    sizeof(idm->idm_attrs[$2])) {
255 				yyerror("attribute truncated");
256 				free($5);
257 				YYERROR;
258 			}
259 			idm->idm_list |= F_LIST($2);
260 			free($5);
261 		}
262 		;
263 
264 directory	: DIRECTORY STRING port {
265 			if ((idm = calloc(1, sizeof(*idm))) == NULL)
266 				fatal(NULL);
267 			idm->idm_id = conf->sc_maxid++;
268 
269 			if (strlcpy(idm->idm_name, $2,
270 			    sizeof(idm->idm_name)) >=
271 			    sizeof(idm->idm_name)) {
272 				yyerror("attribute truncated");
273 				free($2);
274 				YYERROR;
275 			}
276 
277 			free($2);
278 		} '{' optnl diropts '}'			{
279 			TAILQ_INSERT_TAIL(&conf->sc_idms, idm, idm_entry);
280 			idm = NULL;
281 		}
282 		;
283 
284 main		: INTERVAL NUMBER			{
285 			conf->sc_conf_tv.tv_sec = $2;
286 			conf->sc_conf_tv.tv_usec = 0;
287 		}
288 		| DOMAIN STRING				{
289 			if (strlcpy(conf->sc_domainname, $2,
290 			    sizeof(conf->sc_domainname)) >=
291 			    sizeof(conf->sc_domainname)) {
292 				yyerror("domainname truncated");
293 				free($2);
294 				YYERROR;
295 			}
296 			free($2);
297 		}
298 		| PROVIDE MAP STRING			{
299 			if (strcmp($3, "passwd.byname") == 0)
300 				conf->sc_flags |= YPMAP_PASSWD_BYNAME;
301 			else if (strcmp($3, "passwd.byuid") == 0)
302 				conf->sc_flags |= YPMAP_PASSWD_BYUID;
303 			else if (strcmp($3, "master.passwd.byname") == 0)
304 				conf->sc_flags |= YPMAP_MASTER_PASSWD_BYNAME;
305 			else if (strcmp($3, "master.passwd.byuid") == 0)
306 				conf->sc_flags |= YPMAP_MASTER_PASSWD_BYUID;
307 			else if (strcmp($3, "group.byname") == 0)
308 				conf->sc_flags |= YPMAP_GROUP_BYNAME;
309 			else if (strcmp($3, "group.bygid") == 0)
310 				conf->sc_flags |= YPMAP_GROUP_BYGID;
311 			else if (strcmp($3, "netid.byname") == 0)
312 				conf->sc_flags |= YPMAP_NETID_BYNAME;
313 			else {
314 				yyerror("unsupported map type: %s", $3);
315 				free($3);
316 				YYERROR;
317 			}
318 			free($3);
319 		}
320 		;
321 
322 diropts		: diropts diropt nl
323 		| diropt optnl
324 		;
325 
326 %%
327 
328 struct keywords {
329 	const char	*k_name;
330 	int		 k_val;
331 };
332 
333 int
334 yyerror(const char *fmt, ...)
335 {
336 	va_list		 ap;
337 	char		*msg;
338 
339 	file->errors++;
340 	va_start(ap, fmt);
341 	if (vasprintf(&msg, fmt, ap) == -1)
342 		fatalx("yyerror vasprintf");
343 	va_end(ap);
344 	logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
345 	free(msg);
346 	return (0);
347 }
348 
349 int
350 kw_cmp(const void *k, const void *e)
351 {
352 	return (strcmp(k, ((const struct keywords *)e)->k_name));
353 }
354 
355 int
356 lookup(char *s)
357 {
358 	/* this has to be sorted always */
359 	static const struct keywords keywords[] = {
360 		{ "attribute",		ATTRIBUTE },
361 		{ "basedn",		BASEDN },
362 		{ "bindcred",		BINDCRED },
363 		{ "binddn",		BINDDN },
364 		{ "change",		CHANGE },
365 		{ "class",		CLASS },
366 		{ "directory",		DIRECTORY },
367 		{ "domain",		DOMAIN },
368 		{ "expire",		EXPIRE },
369 		{ "filter",		FILTER },
370 		{ "fixed",		FIXED },
371 		{ "gecos",		GECOS },
372 		{ "gid",		GID },
373 		{ "group",		GROUP },
374 		{ "groupdn",		GROUPDN },
375 		{ "groupgid",		GROUPGID },
376 		{ "groupmembers",	GROUPMEMBERS },
377 		{ "groupname",		GROUPNAME },
378 		{ "grouppasswd",	GROUPPASSWD },
379 		{ "home",		HOME },
380 		{ "include",		INCLUDE },
381 		{ "interval",		INTERVAL },
382 		{ "list",		LIST },
383 		{ "map",		MAP },
384 		{ "maps",		MAPS },
385 		{ "name",		NAME },
386 		{ "passwd",		PASSWD },
387 		{ "port",		PORT },
388 		{ "provide",		PROVIDE },
389 		{ "server",		SERVER },
390 		{ "shell",		SHELL },
391 		{ "to",			TO },
392 		{ "uid",		UID },
393 		{ "user",		USER },
394 	};
395 	const struct keywords	*p;
396 
397 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
398 	    sizeof(keywords[0]), kw_cmp);
399 
400 	if (p)
401 		return (p->k_val);
402 	else
403 		return (STRING);
404 }
405 
406 #define MAXPUSHBACK	128
407 
408 u_char	*parsebuf;
409 int	 parseindex;
410 u_char	 pushback_buffer[MAXPUSHBACK];
411 int	 pushback_index = 0;
412 
413 int
414 lgetc(int quotec)
415 {
416 	int		c, next;
417 
418 	if (parsebuf) {
419 		/* Read character from the parsebuffer instead of input. */
420 		if (parseindex >= 0) {
421 			c = parsebuf[parseindex++];
422 			if (c != '\0')
423 				return (c);
424 			parsebuf = NULL;
425 		} else
426 			parseindex++;
427 	}
428 
429 	if (pushback_index)
430 		return (pushback_buffer[--pushback_index]);
431 
432 	if (quotec) {
433 		if ((c = getc(file->stream)) == EOF) {
434 			yyerror("reached end of file while parsing "
435 			    "quoted string");
436 			if (file == topfile || popfile() == EOF)
437 				return (EOF);
438 			return (quotec);
439 		}
440 		return (c);
441 	}
442 
443 	while ((c = getc(file->stream)) == '\\') {
444 		next = getc(file->stream);
445 		if (next != '\n') {
446 			c = next;
447 			break;
448 		}
449 		yylval.lineno = file->lineno;
450 		file->lineno++;
451 	}
452 
453 	while (c == EOF) {
454 		if (file == topfile || popfile() == EOF)
455 			return (EOF);
456 		c = getc(file->stream);
457 	}
458 	return (c);
459 }
460 
461 int
462 lungetc(int c)
463 {
464 	if (c == EOF)
465 		return (EOF);
466 	if (parsebuf) {
467 		parseindex--;
468 		if (parseindex >= 0)
469 			return (c);
470 	}
471 	if (pushback_index < MAXPUSHBACK-1)
472 		return (pushback_buffer[pushback_index++] = c);
473 	else
474 		return (EOF);
475 }
476 
477 int
478 findeol(void)
479 {
480 	int	c;
481 
482 	parsebuf = NULL;
483 
484 	/* skip to either EOF or the first real EOL */
485 	while (1) {
486 		if (pushback_index)
487 			c = pushback_buffer[--pushback_index];
488 		else
489 			c = lgetc(0);
490 		if (c == '\n') {
491 			file->lineno++;
492 			break;
493 		}
494 		if (c == EOF)
495 			break;
496 	}
497 	return (ERROR);
498 }
499 
500 int
501 yylex(void)
502 {
503 	u_char	 buf[8096];
504 	u_char	*p, *val;
505 	int	 quotec, next, c;
506 	int	 token;
507 
508 top:
509 	p = buf;
510 	while ((c = lgetc(0)) == ' ' || c == '\t')
511 		; /* nothing */
512 
513 	yylval.lineno = file->lineno;
514 	if (c == '#')
515 		while ((c = lgetc(0)) != '\n' && c != EOF)
516 			; /* nothing */
517 	if (c == '$' && parsebuf == NULL) {
518 		while (1) {
519 			if ((c = lgetc(0)) == EOF)
520 				return (0);
521 
522 			if (p + 1 >= buf + sizeof(buf) - 1) {
523 				yyerror("string too long");
524 				return (findeol());
525 			}
526 			if (isalnum(c) || c == '_') {
527 				*p++ = c;
528 				continue;
529 			}
530 			*p = '\0';
531 			lungetc(c);
532 			break;
533 		}
534 		val = symget(buf);
535 		if (val == NULL) {
536 			yyerror("macro '%s' not defined", buf);
537 			return (findeol());
538 		}
539 		parsebuf = val;
540 		parseindex = 0;
541 		goto top;
542 	}
543 
544 	switch (c) {
545 	case '\'':
546 	case '"':
547 		quotec = c;
548 		while (1) {
549 			if ((c = lgetc(quotec)) == EOF)
550 				return (0);
551 			if (c == '\n') {
552 				file->lineno++;
553 				continue;
554 			} else if (c == '\\') {
555 				if ((next = lgetc(quotec)) == EOF)
556 					return (0);
557 				if (next == quotec || c == ' ' || c == '\t')
558 					c = next;
559 				else if (next == '\n') {
560 					file->lineno++;
561 					continue;
562 				} else
563 					lungetc(next);
564 			} else if (c == quotec) {
565 				*p = '\0';
566 				break;
567 			} else if (c == '\0') {
568 				yyerror("syntax error");
569 				return (findeol());
570 			}
571 			if (p + 1 >= buf + sizeof(buf) - 1) {
572 				yyerror("string too long");
573 				return (findeol());
574 			}
575 			*p++ = c;
576 		}
577 		yylval.v.string = strdup(buf);
578 		if (yylval.v.string == NULL)
579 			err(1, "yylex: strdup");
580 		return (STRING);
581 	}
582 
583 #define allowed_to_end_number(x) \
584 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
585 
586 	if (c == '-' || isdigit(c)) {
587 		do {
588 			*p++ = c;
589 			if ((unsigned)(p-buf) >= sizeof(buf)) {
590 				yyerror("string too long");
591 				return (findeol());
592 			}
593 		} while ((c = lgetc(0)) != EOF && isdigit(c));
594 		lungetc(c);
595 		if (p == buf + 1 && buf[0] == '-')
596 			goto nodigits;
597 		if (c == EOF || allowed_to_end_number(c)) {
598 			const char *errstr = NULL;
599 
600 			*p = '\0';
601 			yylval.v.number = strtonum(buf, LLONG_MIN,
602 			    LLONG_MAX, &errstr);
603 			if (errstr) {
604 				yyerror("\"%s\" invalid number: %s",
605 				    buf, errstr);
606 				return (findeol());
607 			}
608 			return (NUMBER);
609 		} else {
610 nodigits:
611 			while (p > buf + 1)
612 				lungetc(*--p);
613 			c = *--p;
614 			if (c == '-')
615 				return (c);
616 		}
617 	}
618 
619 #define allowed_in_string(x) \
620 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
621 	x != '{' && x != '}' && x != '<' && x != '>' && \
622 	x != '!' && x != '=' && x != '#' && \
623 	x != ','))
624 
625 	if (isalnum(c) || c == ':' || c == '_') {
626 		do {
627 			*p++ = c;
628 			if ((unsigned)(p-buf) >= sizeof(buf)) {
629 				yyerror("string too long");
630 				return (findeol());
631 			}
632 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
633 		lungetc(c);
634 		*p = '\0';
635 		if ((token = lookup(buf)) == STRING)
636 			if ((yylval.v.string = strdup(buf)) == NULL)
637 				err(1, "yylex: strdup");
638 		return (token);
639 	}
640 	if (c == '\n') {
641 		yylval.lineno = file->lineno;
642 		file->lineno++;
643 	}
644 	if (c == EOF)
645 		return (0);
646 	return (c);
647 }
648 
649 int
650 check_file_secrecy(int fd, const char *fname)
651 {
652 	struct stat	st;
653 
654 	if (fstat(fd, &st)) {
655 		log_warn("cannot stat %s", fname);
656 		return (-1);
657 	}
658 	if (st.st_uid != 0 && st.st_uid != getuid()) {
659 		log_warnx("%s: owner not root or current user", fname);
660 		return (-1);
661 	}
662 	if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
663 		log_warnx("%s: group writable or world read/writable", fname);
664 		return (-1);
665 	}
666 	return (0);
667 }
668 
669 struct file *
670 pushfile(const char *name, int secret)
671 {
672 	struct file	*nfile;
673 
674 	if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
675 		log_warn("malloc");
676 		return (NULL);
677 	}
678 	if ((nfile->name = strdup(name)) == NULL) {
679 		log_warn("malloc");
680 		free(nfile);
681 		return (NULL);
682 	}
683 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
684 		log_warn("%s", nfile->name);
685 		free(nfile->name);
686 		free(nfile);
687 		return (NULL);
688 	} else if (secret &&
689 	    check_file_secrecy(fileno(nfile->stream), nfile->name)) {
690 		fclose(nfile->stream);
691 		free(nfile->name);
692 		free(nfile);
693 		return (NULL);
694 	}
695 	nfile->lineno = 1;
696 	TAILQ_INSERT_TAIL(&files, nfile, entry);
697 	return (nfile);
698 }
699 
700 int
701 popfile(void)
702 {
703 	struct file	*prev;
704 
705 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
706 		prev->errors += file->errors;
707 
708 	TAILQ_REMOVE(&files, file, entry);
709 	fclose(file->stream);
710 	free(file->name);
711 	free(file);
712 	file = prev;
713 	return (file ? 0 : EOF);
714 }
715 
716 int
717 parse_config(struct env *x_conf, const char *filename, int opts)
718 {
719 	struct sym	*sym, *next;
720 
721 	conf = x_conf;
722 	bzero(conf, sizeof(*conf));
723 
724 	TAILQ_INIT(&conf->sc_idms);
725 	conf->sc_conf_tv.tv_sec = DEFAULT_INTERVAL;
726 	conf->sc_conf_tv.tv_usec = 0;
727 
728 	errors = 0;
729 
730 	if ((file = pushfile(filename, 1)) == NULL) {
731 		return (-1);
732 	}
733 	topfile = file;
734 
735 	/*
736 	 * parse configuration
737 	 */
738 	setservent(1);
739 	yyparse();
740 	endservent();
741 	errors = file->errors;
742 	popfile();
743 
744 	/* Free macros and check which have not been used. */
745 	for (sym = TAILQ_FIRST(&symhead); sym != NULL; sym = next) {
746 		next = TAILQ_NEXT(sym, entry);
747 		if ((opts & YPLDAP_OPT_VERBOSE) && !sym->used)
748 			fprintf(stderr, "warning: macro '%s' not "
749 			    "used\n", sym->nam);
750 		if (!sym->persist) {
751 			free(sym->nam);
752 			free(sym->val);
753 			TAILQ_REMOVE(&symhead, sym, entry);
754 			free(sym);
755 		}
756 	}
757 
758 	if (errors) {
759 		return (-1);
760 	}
761 
762 	return (0);
763 }
764 
765 int
766 symset(const char *nam, const char *val, int persist)
767 {
768 	struct sym	*sym;
769 
770 	for (sym = TAILQ_FIRST(&symhead); sym && strcmp(nam, sym->nam);
771 	    sym = TAILQ_NEXT(sym, entry))
772 		;	/* nothing */
773 
774 	if (sym != NULL) {
775 		if (sym->persist == 1)
776 			return (0);
777 		else {
778 			free(sym->nam);
779 			free(sym->val);
780 			TAILQ_REMOVE(&symhead, sym, entry);
781 			free(sym);
782 		}
783 	}
784 	if ((sym = calloc(1, sizeof(*sym))) == NULL)
785 		return (-1);
786 
787 	sym->nam = strdup(nam);
788 	if (sym->nam == NULL) {
789 		free(sym);
790 		return (-1);
791 	}
792 	sym->val = strdup(val);
793 	if (sym->val == NULL) {
794 		free(sym->nam);
795 		free(sym);
796 		return (-1);
797 	}
798 	sym->used = 0;
799 	sym->persist = persist;
800 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
801 	return (0);
802 }
803 
804 int
805 cmdline_symset(char *s)
806 {
807 	char	*sym, *val;
808 	int	ret;
809 	size_t	len;
810 
811 	if ((val = strrchr(s, '=')) == NULL)
812 		return (-1);
813 
814 	len = strlen(s) - strlen(val) + 1;
815 	if ((sym = malloc(len)) == NULL)
816 		errx(1, "cmdline_symset: malloc");
817 
818 	(void)strlcpy(sym, s, len);
819 
820 	ret = symset(sym, val + 1, 1);
821 	free(sym);
822 
823 	return (ret);
824 }
825 
826 char *
827 symget(const char *nam)
828 {
829 	struct sym	*sym;
830 
831 	TAILQ_FOREACH(sym, &symhead, entry)
832 		if (strcmp(nam, sym->nam) == 0) {
833 			sym->used = 1;
834 			return (sym->val);
835 		}
836 	return (NULL);
837 }
838