1 %{
2 
3 /*
4  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
5  * Copyright (c) 2018 Florian Obser <florian@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 #include <ctype.h>
27 #include <errno.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 
33 #include "gmid.h"
34 
35 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
36 static struct file {
37 	TAILQ_ENTRY(file)	 entry;
38 	FILE			*stream;
39 	char			*name;
40 	size_t	 		 ungetpos;
41 	size_t			 ungetsize;
42 	u_char			*ungetbuf;
43 	int			 eof_reached;
44 	int			 lineno;
45 	int			 errors;
46 } *file, *topfile;
47 
48 struct file	*pushfile(const char *, int);
49 int		 popfile(void);
50 int		 yyparse(void);
51 int		 yylex(void);
52 void		 yyerror(const char *, ...)
53     __attribute__((__format__ (printf, 1, 2)))
54     __attribute__((__nonnull__ (1)));
55 void		 yywarn(const char *, ...)
56     __attribute__((__format__ (printf, 1, 2)))
57     __attribute__((__nonnull__ (1)));
58 int		 kw_cmp(const void *, const void *);
59 int		 lookup(char *);
60 int		 igetc(void);
61 int		 lgetc(int);
62 void		 lungetc(int);
63 int		 findeol(void);
64 
65 /*
66  * #define YYDEBUG 1
67  * int yydebug = 1;
68  */
69 
70 TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
71 struct sym {
72 	TAILQ_ENTRY(sym)	 entry;
73 	int			 used;
74 	int			 persist;
75 	char			*name;
76 	char			*val;
77 };
78 
79 int	 symset(const char *, const char *, int);
80 char	*symget(const char *);
81 
82 struct vhost	*new_vhost(void);
83 struct location	*new_location(void);
84 char		*ensure_absolute_path(char*);
85 int		 check_block_code(int);
86 char		*check_block_fmt(char*);
87 int		 check_strip_no(int);
88 int		 check_port_num(int);
89 int		 check_prefork_num(int);
90 void		 advance_loc(void);
91 void		 only_once(const void*, const char*);
92 void		 only_oncei(int, const char*);
93 int		 fastcgi_conf(char *, char *, char *);
94 void		 add_param(char *, char *, int);
95 
96 static struct vhost		*host;
97 static struct location		*loc;
98 static int			 errors;
99 
100 typedef struct {
101 	union {
102 		char	*string;
103 		int	 number;
104 	} v;
105 	int lineno;
106 } YYSTYPE;
107 
108 %}
109 
110 /* for bison: */
111 /* %define parse.error verbose */
112 
113 %token	ALIAS AUTO
114 %token	BLOCK
115 %token	CA CERT CGI CHROOT CLIENT
116 %token	DEFAULT
117 %token	ENTRYPOINT ENV
118 %token	FASTCGI
119 %token	INCLUDE INDEX IPV6
120 %token	KEY
121 %token	LANG LOCATION LOG
122 %token	MAP MIME
123 %token	OFF ON
124 %token	PARAM PORT PREFORK PROTOCOLS
125 %token	REQUIRE RETURN ROOT
126 %token	SERVER SPAWN STRIP
127 %token	TCP TOEXT TYPE USER
128 
129 %token	ERROR
130 
131 %token	<v.string>	STRING
132 %token	<v.number>	NUM
133 
134 %type	<v.number>	bool
135 %type	<v.string>	string
136 
137 %%
138 
139 conf		: /* empty */
140 		| conf include '\n'
141 		| conf '\n'
142 		| conf varset '\n'
143 		| conf option '\n'
144 		| conf vhost '\n'
145 		| conf error '\n'		{ file->errors++; }
146 		;
147 
148 include		: INCLUDE STRING		{
149 			struct file	*nfile;
150 
151 			if ((nfile = pushfile($2, 0)) == NULL) {
152 				yyerror("failed to include file %s", $2);
153 				free($2);
154 				YYERROR;
155 			}
156 			free($2);
157 
158 			file = nfile;
159 			lungetc('\n');
160 		}
161 		;
162 
163 bool		: ON	{ $$ = 1; }
164 		| OFF	{ $$ = 0; }
165 		;
166 
167 string		: string STRING	{
168 			if (asprintf(&$$, "%s%s", $1, $2) == -1) {
169 				free($1);
170 				free($2);
171 				yyerror("string: asprintf: %s", strerror(errno));
172 				YYERROR;
173 			}
174 			free($1);
175 			free($2);
176 		}
177 		| STRING
178 		;
179 
180 varset		: STRING '=' string		{
181 			char *s = $1;
182 			while (*s++) {
183 				if (isspace((unsigned char)*s)) {
184 					yyerror("macro name cannot contain "
185 					    "whitespaces");
186 					free($1);
187 					free($3);
188 					YYERROR;
189 				}
190 			}
191 			symset($1, $3, 0);
192 			free($1);
193 			free($3);
194 		}
195 		;
196 
197 option		: CHROOT string	{ conf.chroot = $2; }
198 		| IPV6 bool		{ conf.ipv6 = $2; }
199 		| MIME STRING string	{
200 			yywarn("`mime MIME EXT' is deprecated and will be "
201 			    "removed in a future version, please use the new "
202 			    "syntax: `map MIME to-ext EXT'");
203 			add_mime(&conf.mime, $2, $3);
204 		}
205 		| MAP string TOEXT string { add_mime(&conf.mime, $2, $4); }
206 		| PORT NUM		{ conf.port = check_port_num($2); }
207 		| PREFORK NUM		{ conf.prefork = check_prefork_num($2); }
208 		| PROTOCOLS string {
209 			if (tls_config_parse_protocols(&conf.protos, $2) == -1)
210 				yyerror("invalid protocols string \"%s\"", $2);
211 		}
212 		| USER string		{ conf.user = $2; }
213 		;
214 
215 vhost		: SERVER string {
216 			host = new_vhost();
217 			TAILQ_INSERT_HEAD(&hosts, host, vhosts);
218 
219 			loc = new_location();
220 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
221 
222 			loc->match = xstrdup("*");
223 			host->domain = $2;
224 
225 			if (strstr($2, "xn--") != NULL) {
226 				yywarn("\"%s\" looks like punycode: you "
227 				    "should use the decoded hostname", $2);
228 			}
229 		} '{' optnl servopts locations '}' {
230 			if (host->cert == NULL || host->key == NULL)
231 				yyerror("invalid vhost definition: %s", $2);
232 		}
233 		| error '}'		{ yyerror("bad server directive"); }
234 		;
235 
236 servopts	: /* empty */
237 		| servopts servopt optnl
238 		;
239 
240 servopt		: ALIAS string {
241 			struct alist *a;
242 
243 			a = xcalloc(1, sizeof(*a));
244 			a->alias = $2;
245 			if (TAILQ_EMPTY(&host->aliases))
246 				TAILQ_INSERT_HEAD(&host->aliases, a, aliases);
247 			else
248 				TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
249 		}
250 		| CERT string		{
251 			only_once(host->cert, "cert");
252 			host->cert = ensure_absolute_path($2);
253 		}
254 		| CGI string		{
255 			only_once(host->cgi, "cgi");
256 			/* drop the starting '/', if any */
257 			if (*$2 == '/')
258 				memmove($2, $2+1, strlen($2));
259 			host->cgi = $2;
260 		}
261 		| ENTRYPOINT string {
262 			only_once(host->entrypoint, "entrypoint");
263 			while (*$2 == '/')
264 				memmove($2, $2+1, strlen($2));
265 			host->entrypoint = $2;
266 		}
267 		| ENV string '=' string {
268 			add_param($2, $4, 1);
269 		}
270 		| KEY string		{
271 			only_once(host->key, "key");
272 			host->key  = ensure_absolute_path($2);
273 		}
274 		| PARAM string '=' string {
275 			add_param($2, $4, 0);
276 		}
277 		| locopt
278 		;
279 
280 locations	: /* empty */
281 		| locations location optnl
282 		;
283 
284 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
285 			/* drop the starting '/' if any */
286 			if (*$3 == '/')
287 				memmove($3, $3+1, strlen($3));
288 			loc->match = $3;
289 		}
290 		| error '}'
291 		;
292 
293 locopts		: /* empty */
294 		| locopts locopt optnl
295 		;
296 
297 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
298 		| BLOCK RETURN NUM string {
299 			only_once(loc->block_fmt, "block");
300 			loc->block_fmt = check_block_fmt($4);
301 			loc->block_code = check_block_code($3);
302 		}
303 		| BLOCK RETURN NUM {
304 			only_once(loc->block_fmt, "block");
305 			loc->block_fmt = xstrdup("temporary failure");
306 			loc->block_code = check_block_code($3);
307 			if ($3 >= 30 && $3 < 40)
308 				yyerror("missing `meta' for block return %d", $3);
309 		}
310 		| BLOCK {
311 			only_once(loc->block_fmt, "block");
312 			loc->block_fmt = xstrdup("temporary failure");
313 			loc->block_code = 40;
314 		}
315 		| DEFAULT TYPE string {
316 			only_once(loc->default_mime, "default type");
317 			loc->default_mime = $3;
318 		}
319 		| FASTCGI fastcgi
320 		| INDEX string {
321 			only_once(loc->index, "index");
322 			loc->index = $2;
323 		}
324 		| LANG string {
325 			only_once(loc->lang, "lang");
326 			loc->lang = $2;
327 		}
328 		| LOG bool	{ loc->disable_log = !$2; }
329 		| REQUIRE CLIENT CA string {
330 			only_once(loc->reqca, "require client ca");
331 			ensure_absolute_path($4);
332 			if ((loc->reqca = load_ca($4)) == NULL)
333 				yyerror("couldn't load ca cert: %s", $4);
334 			free($4);
335 		}
336 		| ROOT string		{
337 			only_once(loc->dir, "root");
338 			loc->dir  = ensure_absolute_path($2);
339 		}
340 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
341 		;
342 
343 fastcgi		: SPAWN string {
344 			only_oncei(loc->fcgi, "fastcgi");
345 			loc->fcgi = fastcgi_conf(NULL, NULL, $2);
346 		}
347 		| string {
348 			only_oncei(loc->fcgi, "fastcgi");
349 			loc->fcgi = fastcgi_conf($1, NULL, NULL);
350 		}
351 		| TCP string PORT NUM {
352 			char *c;
353 			if (asprintf(&c, "%d", $4) == -1)
354 				err(1, "asprintf");
355 			only_oncei(loc->fcgi, "fastcgi");
356 			loc->fcgi = fastcgi_conf($2, c, NULL);
357 		}
358 		| TCP string {
359 			only_oncei(loc->fcgi, "fastcgi");
360 			loc->fcgi = fastcgi_conf($2, xstrdup("9000"), NULL);
361 		}
362 		| TCP string PORT string {
363 			only_oncei(loc->fcgi, "fastcgi");
364 			loc->fcgi = fastcgi_conf($2, $4, NULL);
365 		}
366 		;
367 
368 optnl		: '\n' optnl		/* zero or more newlines */
369 		| ';' optnl		/* semicolons too */
370 		| /*empty*/
371 		;
372 
373 %%
374 
375 static struct keyword {
376 	const char *word;
377 	int token;
378 } keywords[] = {
379 	/* these MUST be sorted */
380 	{"alias", ALIAS},
381 	{"auto", AUTO},
382 	{"block", BLOCK},
383 	{"ca", CA},
384 	{"cert", CERT},
385 	{"cgi", CGI},
386 	{"chroot", CHROOT},
387 	{"client", CLIENT},
388 	{"default", DEFAULT},
389 	{"entrypoint", ENTRYPOINT},
390 	{"env", ENV},
391 	{"fastcgi", FASTCGI},
392 	{"index", INDEX},
393 	{"ipv6", IPV6},
394 	{"key", KEY},
395 	{"lang", LANG},
396 	{"location", LOCATION},
397 	{"log", LOG},
398 	{"map", MAP},
399 	{"mime", MIME},
400 	{"off", OFF},
401 	{"on", ON},
402 	{"param", PARAM},
403 	{"port", PORT},
404 	{"prefork", PREFORK},
405 	{"protocols", PROTOCOLS},
406 	{"require", REQUIRE},
407 	{"return", RETURN},
408 	{"root", ROOT},
409 	{"server", SERVER},
410 	{"spawn", SPAWN},
411 	{"strip", STRIP},
412 	{"tcp", TCP},
413 	{"to-ext", TOEXT},
414 	{"type", TYPE},
415 	{"user", USER},
416 };
417 
418 void
419 yyerror(const char *msg, ...)
420 {
421 	va_list ap;
422 
423 	file->errors++;
424 
425 	va_start(ap, msg);
426 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
427 	vfprintf(stderr, msg, ap);
428 	fprintf(stderr, "\n");
429 	va_end(ap);
430 }
431 
432 void
433 yywarn(const char *msg, ...)
434 {
435 	va_list ap;
436 
437 	va_start(ap, msg);
438 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
439 	vfprintf(stderr, msg, ap);
440 	fprintf(stderr, "\n");
441 	va_end(ap);
442 }
443 
444 int
445 kw_cmp(const void *k, const void *e)
446 {
447 	return strcmp(k, ((struct keyword *)e)->word);
448 }
449 
450 int
451 lookup(char *s)
452 {
453 	const struct keyword	*p;
454 
455 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
456 	    sizeof(keywords[0]), kw_cmp);
457 
458 	if (p)
459 		return p->token;
460 	else
461 		return STRING;
462 }
463 
464 #define START_EXPAND	1
465 #define DONE_EXPAND	2
466 
467 static int	expanding;
468 
469 int
470 igetc(void)
471 {
472 	int	c;
473 
474 	while (1) {
475 		if (file->ungetpos > 0)
476 			c = file->ungetbuf[--file->ungetpos];
477 		else
478 			c = getc(file->stream);
479 
480 		if (c == START_EXPAND)
481 			expanding = 1;
482 		else if (c == DONE_EXPAND)
483 			expanding = 0;
484 		else
485 			break;
486 	}
487 	return c;
488 }
489 
490 int
491 lgetc(int quotec)
492 {
493 	int		c, next;
494 
495 	if (quotec) {
496 		if ((c = igetc()) == EOF) {
497 			yyerror("reached end of file while parsing "
498 			    "quoted string");
499 			if (file == topfile || popfile() == EOF)
500 				return EOF;
501 			return quotec;
502 		}
503 		return c;
504 	}
505 
506 	while ((c = igetc()) == '\\') {
507 		next = igetc();
508 		if (next != '\n') {
509 			c = next;
510 			break;
511 		}
512 		yylval.lineno = file->lineno;
513 		file->lineno++;
514 	}
515 
516 	if (c == EOF) {
517 		/*
518 		 * Fake EOL when hit EOF for the first time. This gets line
519 		 * count right if last line in included file is syntactically
520 		 * invalid and has no newline.
521 		 */
522 		if (file->eof_reached == 0) {
523 			file->eof_reached = 1;
524 			return '\n';
525 		}
526 		while (c == EOF) {
527 			if (file == topfile || popfile() == EOF)
528 				return EOF;
529 			c = igetc();
530 		}
531 	}
532 	return c;
533 }
534 
535 void
536 lungetc(int c)
537 {
538 	if (c == EOF)
539 		return;
540 
541 	if (file->ungetpos >= file->ungetsize) {
542 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
543 		if (p == NULL)
544 			err(1, "lungetc");
545 		file->ungetbuf = p;
546 		file->ungetsize *= 2;
547 	}
548 	file->ungetbuf[file->ungetpos++] = c;
549 }
550 
551 int
552 findeol(void)
553 {
554 	int	c;
555 
556 	/* Skip to either EOF or the first real EOL. */
557 	while (1) {
558 		c = lgetc(0);
559 		if (c == '\n') {
560 			file->lineno++;
561 			break;
562 		}
563 		if (c == EOF)
564 			break;
565 	}
566 	return ERROR;
567 }
568 
569 int
570 yylex(void)
571 {
572 	char	 buf[8096];
573 	char	*p, *val;
574 	int	 quotec, next, c;
575 	int	 token;
576 
577 top:
578 	p = buf;
579 	while ((c = lgetc(0)) == ' ' || c == '\t')
580 		; /* nothing */
581 
582 	yylval.lineno = file->lineno;
583 	if (c == '#')
584 		while ((c = lgetc(0)) != '\n' && c != EOF)
585 			; /* nothing */
586 	if (c == '$' && !expanding) {
587 		while (1) {
588 			if ((c = lgetc(0)) == EOF)
589 				return 0;
590 			if (p + 1 >= buf + sizeof(buf) -1) {
591 				yyerror("string too long");
592 				return findeol();
593 			}
594 			if (isalnum(c) || c == '_') {
595 				*p++ = c;
596 				continue;
597 			}
598 			*p = '\0';
599 			lungetc(c);
600 			break;
601 		}
602 		val = symget(buf);
603 		if (val == NULL) {
604 			yyerror("macro `%s' not defined", buf);
605 			return findeol();
606 		}
607 		yylval.v.string = xstrdup(val);
608 		return STRING;
609 	}
610 	if (c == '@' && !expanding) {
611 		while (1) {
612 			if ((c = lgetc(0)) == EOF)
613 				return 0;
614 
615 			if (p + 1 >= buf + sizeof(buf) - 1) {
616 				yyerror("string too long");
617 				return findeol();
618 			}
619 			if (isalnum(c) || c == '_') {
620 				*p++ = c;
621 				continue;
622 			}
623 			*p = '\0';
624 			lungetc(c);
625 			break;
626 		}
627 		val = symget(buf);
628 		if (val == NULL) {
629 			yyerror("macro '%s' not defined", buf);
630 			return findeol();
631 		}
632 		p = val + strlen(val) - 1;
633 		lungetc(DONE_EXPAND);
634 		while (p >= val) {
635 			lungetc(*p);
636 			p--;
637 		}
638 		lungetc(START_EXPAND);
639 		goto top;
640 	}
641 
642 	switch (c) {
643 	case '\'':
644 	case '"':
645 		quotec = c;
646 		while (1) {
647 			if ((c = lgetc(quotec)) == EOF)
648 				return 0;
649 			if (c == '\n') {
650 				file->lineno++;
651 				continue;
652 			} else if (c == '\\') {
653 				if ((next = lgetc(quotec)) == EOF)
654 					return (0);
655 				if (next == quotec || next == ' ' ||
656 				    next == '\t')
657 					c = next;
658 				else if (next == '\n') {
659 					file->lineno++;
660 					continue;
661 				} else
662 					lungetc(next);
663 			} else if (c == quotec) {
664 				*p = '\0';
665 				break;
666 			} else if (c == '\0') {
667 				yyerror("invalid syntax");
668 				return findeol();
669 			}
670 			if (p + 1 >= buf + sizeof(buf) - 1) {
671 				yyerror("string too long");
672 				return findeol();
673 			}
674 			*p++ = c;
675 		}
676 		yylval.v.string = strdup(buf);
677 		if (yylval.v.string == NULL)
678 			err(1, "yylex: strdup");
679 		return STRING;
680 	}
681 
682 #define allowed_to_end_number(x) \
683 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
684 
685 	if (c == '-' || isdigit(c)) {
686 		do {
687 			*p++ = c;
688 			if ((size_t)(p-buf) >= sizeof(buf)) {
689 				yyerror("string too long");
690 				return findeol();
691 			}
692 		} while ((c = lgetc(0)) != EOF && isdigit(c));
693 		lungetc(c);
694 		if (p == buf + 1 && buf[0] == '-')
695 			goto nodigits;
696 		if (c == EOF || allowed_to_end_number(c)) {
697 			const char *errstr = NULL;
698 
699 			*p = '\0';
700 			yylval.v.number = strtonum(buf, LLONG_MIN,
701 			    LLONG_MAX, &errstr);
702 			if (errstr) {
703 				yyerror("\"%s\" invalid number: %s",
704 				    buf, errstr);
705 				return findeol();
706 			}
707 			return NUM;
708 		} else {
709 nodigits:
710 			while (p > buf + 1)
711 				lungetc(*--p);
712 			c = *--p;
713 			if (c == '-')
714 				return c;
715 		}
716 	}
717 
718 #define allowed_in_string(x) \
719 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
720 	x != '{' && x != '}' && \
721 	x != '!' && x != '=' && x != '#' && \
722 	x != ',' && x != ';'))
723 
724 	if (isalnum(c) || c == ':' || c == '_') {
725 		do {
726 			*p++ = c;
727 			if ((size_t)(p-buf) >= sizeof(buf)) {
728 				yyerror("string too long");
729 				return findeol();
730 			}
731 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
732 		lungetc(c);
733 		*p = '\0';
734 		if ((token = lookup(buf)) == STRING)
735 			yylval.v.string = xstrdup(buf);
736 		return token;
737 	}
738 	if (c == '\n') {
739 		yylval.lineno = file->lineno;
740 		file->lineno++;
741 	}
742 	if (c == EOF)
743 		return 0;
744 	return c;
745 }
746 
747 struct file *
748 pushfile(const char *name, int secret)
749 {
750 	struct file	*nfile;
751 
752 	nfile = xcalloc(1, sizeof(*nfile));
753 	nfile->name = xstrdup(name);
754 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
755 		log_warn(NULL, "can't open %s: %s", nfile->name,
756 		    strerror(errno));
757 		free(nfile->name);
758 		free(nfile);
759 		return NULL;
760 	}
761 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
762 	nfile->ungetsize = 16;
763 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
764 	TAILQ_INSERT_TAIL(&files, nfile, entry);
765 	return nfile;
766 }
767 
768 int
769 popfile(void)
770 {
771 	struct file	*prev;
772 
773 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
774 		prev->errors += file->errors;
775 
776 	TAILQ_REMOVE(&files, file, entry);
777 	fclose(file->stream);
778 	free(file->name);
779 	free(file->ungetbuf);
780 	free(file);
781 	file = prev;
782 	return file ? 0 : EOF;
783 }
784 
785 void
786 parse_conf(const char *filename)
787 {
788 	struct sym		*sym, *next;
789 
790 	file = pushfile(filename, 0);
791 	if (file == NULL)
792 		exit(1);
793 	topfile = file;
794 
795 	yyparse();
796 	errors = file->errors;
797 	popfile();
798 
799 	/* Free macros and check which have not been used. */
800 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
801 		/* TODO: warn if !sym->used */
802 		if (!sym->persist) {
803 			free(sym->name);
804 			free(sym->val);
805 			TAILQ_REMOVE(&symhead, sym, entry);
806 			free(sym);
807 		}
808 	}
809 
810 	if (errors)
811 		exit(1);
812 }
813 
814 int
815 symset(const char *name, const char *val, int persist)
816 {
817 	struct sym *sym;
818 
819 	TAILQ_FOREACH(sym, &symhead, entry) {
820 		if (!strcmp(name, sym->name))
821 			break;
822 	}
823 
824 	if (sym != NULL) {
825 		if (sym->persist)
826 			return 0;
827 		else {
828 			free(sym->name);
829 			free(sym->val);
830 			TAILQ_REMOVE(&symhead, sym, entry);
831 			free(sym);
832 		}
833 	}
834 
835 	sym = xcalloc(1, sizeof(*sym));
836 	sym->name = xstrdup(name);
837 	sym->val = xstrdup(val);
838 	sym->used = 0;
839 	sym->persist = persist;
840 
841 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
842 	return 0;
843 }
844 
845 int
846 cmdline_symset(char *s)
847 {
848 	char	*sym, *val;
849 	int	 ret;
850 
851 	if ((val = strrchr(s, '=')) == NULL)
852 		return -1;
853 	sym = xcalloc(1, val - s + 1);
854 	memcpy(sym, s, val - s);
855 	ret = symset(sym, val + 1, 1);
856 	free(sym);
857 	return ret;
858 }
859 
860 char *
861 symget(const char *nam)
862 {
863 	struct sym	*sym;
864 
865 	TAILQ_FOREACH(sym, &symhead, entry) {
866 		if (strcmp(nam, sym->name) == 0) {
867 			sym->used = 1;
868 			return sym->val;
869 		}
870 	}
871 	return NULL;
872 }
873 
874 struct vhost *
875 new_vhost(void)
876 {
877 	return xcalloc(1, sizeof(struct vhost));
878 }
879 
880 struct location *
881 new_location(void)
882 {
883 	struct location *l;
884 
885 	l = xcalloc(1, sizeof(*l));
886 	l->dirfd = -1;
887 	l->fcgi = -1;
888 	return l;
889 }
890 
891 char *
892 ensure_absolute_path(char *path)
893 {
894 	if (path == NULL || *path != '/')
895 		yyerror("not an absolute path: %s", path);
896 	return path;
897 }
898 
899 int
900 check_block_code(int n)
901 {
902 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
903 		yyerror("invalid block code %d", n);
904 	return n;
905 }
906 
907 char *
908 check_block_fmt(char *fmt)
909 {
910 	char *s;
911 
912 	for (s = fmt; *s; ++s) {
913 		if (*s != '%')
914 			continue;
915 		switch (*++s) {
916 		case '%':
917 		case 'p':
918 		case 'q':
919 		case 'P':
920 		case 'N':
921 			break;
922 		default:
923 			yyerror("invalid format specifier %%%c", *s);
924 		}
925 	}
926 
927 	return fmt;
928 }
929 
930 int
931 check_strip_no(int n)
932 {
933 	if (n <= 0)
934 		yyerror("invalid strip number %d", n);
935 	return n;
936 }
937 
938 int
939 check_port_num(int n)
940 {
941 	if (n <= 0 || n >= UINT16_MAX)
942 		yyerror("port number is %s: %d",
943 		    n <= 0 ? "too small" : "too large",
944 		    n);
945 	return n;
946 }
947 
948 int
949 check_prefork_num(int n)
950 {
951 	if (n <= 0 || n >= PROC_MAX)
952 		yyerror("invalid prefork number %d", n);
953 	return n;
954 }
955 
956 void
957 advance_loc(void)
958 {
959 	loc = new_location();
960 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
961 }
962 
963 void
964 only_once(const void *ptr, const char *name)
965 {
966 	if (ptr != NULL)
967 		yyerror("`%s' specified more than once", name);
968 }
969 
970 void
971 only_oncei(int i, const char *name)
972 {
973 	if (i != -1)
974 		yyerror("`%s' specified more than once", name);
975 }
976 
977 int
978 fastcgi_conf(char *path, char *port, char *prog)
979 {
980 	struct fcgi	*f;
981 	int		i;
982 
983 	for (i = 0; i < FCGI_MAX; ++i) {
984 		f = &fcgi[i];
985 
986 		if (f->path == NULL) {
987 			f->id = i;
988 			f->path = path;
989 			f->port = port;
990 			f->prog = prog;
991 			return i;
992 		}
993 
994 		/* XXX: what to do with prog? */
995 		if (!strcmp(f->path, path) &&
996 		    ((port == NULL && f->port == NULL) ||
997 		     !strcmp(f->port, port))) {
998 			free(path);
999 			free(port);
1000 			return i;
1001 		}
1002 	}
1003 
1004 	yyerror("too much `fastcgi' rules defined.");
1005 	return -1;
1006 }
1007 
1008 void
1009 add_param(char *name, char *val, int env)
1010 {
1011 	struct envlist *e;
1012 	struct envhead *h;
1013 
1014 	if (env)
1015 		h = &host->env;
1016 	else
1017 		h = &host->params;
1018 
1019 	e = xcalloc(1, sizeof(*e));
1020 	e->name = name;
1021 	e->value = val;
1022 	if (TAILQ_EMPTY(h))
1023 		TAILQ_INSERT_HEAD(h, e, envs);
1024 	else
1025 		TAILQ_INSERT_TAIL(h, e, envs);
1026 }