1 %{
2 
3 /*
4  * Copyright (c) 2021, 2022 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 "gmid.h"
27 
28 #include <ctype.h>
29 #include <errno.h>
30 #include <netdb.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 
36 #include "log.h"
37 
38 struct conf *conf;
39 
40 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
41 static struct file {
42 	TAILQ_ENTRY(file)	 entry;
43 	FILE			*stream;
44 	char			*name;
45 	size_t	 		 ungetpos;
46 	size_t			 ungetsize;
47 	u_char			*ungetbuf;
48 	int			 eof_reached;
49 	int			 lineno;
50 	int			 errors;
51 } *file, *topfile;
52 
53 struct file	*pushfile(const char *, int);
54 int		 popfile(void);
55 int		 yyparse(void);
56 int		 yylex(void);
57 void		 yyerror(const char *, ...)
58     __attribute__((__format__ (printf, 1, 2)))
59     __attribute__((__nonnull__ (1)));
60 void		 yywarn(const char *, ...)
61     __attribute__((__format__ (printf, 1, 2)))
62     __attribute__((__nonnull__ (1)));
63 int		 kw_cmp(const void *, const void *);
64 int		 lookup(char *);
65 int		 igetc(void);
66 int		 lgetc(int);
67 void		 lungetc(int);
68 int		 findeol(void);
69 
70 /*
71  * #define YYDEBUG 1
72  * int yydebug = 1;
73  */
74 
75 TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
76 struct sym {
77 	TAILQ_ENTRY(sym)	 entry;
78 	int			 used;
79 	int			 persist;
80 	char			*name;
81 	char			*val;
82 };
83 
84 int	 symset(const char *, const char *, int);
85 char	*symget(const char *);
86 
87 struct vhost	*new_vhost(void);
88 struct location	*new_location(void);
89 struct proxy	*new_proxy(void);
90 char		*ensure_absolute_path(char*);
91 int		 check_block_code(int);
92 char		*check_block_fmt(char*);
93 int		 check_strip_no(int);
94 int		 check_port_num(int);
95 int		 check_prefork_num(int);
96 void		 advance_loc(void);
97 void		 advance_proxy(void);
98 void		 parsehp(char *, char **, const char **, const char *);
99 int		 fastcgi_conf(const char *, const char *);
100 void		 add_param(char *, char *);
101 int		 getservice(const char *);
102 
103 static struct vhost		*host;
104 static struct location		*loc;
105 static struct proxy		*proxy;
106 static char			*current_media;
107 static int			 errors;
108 
109 typedef struct {
110 	union {
111 		char	*string;
112 		int	 number;
113 	} v;
114 	int lineno;
115 } YYSTYPE;
116 
117 %}
118 
119 /* for bison: */
120 /* %define parse.error verbose */
121 
122 %token	ALIAS AUTO
123 %token	BLOCK
124 %token	CA CERT CHROOT CLIENT
125 %token	DEFAULT
126 %token	FASTCGI FOR_HOST
127 %token	INCLUDE INDEX IPV6
128 %token	KEY
129 %token	LANG LOCATION LOG
130 %token	OCSP OFF ON
131 %token	PARAM PORT PREFORK PROTO PROTOCOLS PROXY
132 %token	RELAY_TO REQUIRE RETURN ROOT
133 %token	SERVER SNI STRIP
134 %token	TCP TOEXT TYPE TYPES
135 %token	USE_TLS USER
136 %token	VERIFYNAME
137 
138 %token	ERROR
139 
140 %token	<v.string>	STRING
141 %token	<v.number>	NUM
142 
143 %type	<v.number>	bool proxy_port
144 %type	<v.string>	string numberstring
145 
146 %%
147 
148 conf		: /* empty */
149 		| conf include '\n'
150 		| conf '\n'
151 		| conf varset '\n'
152 		| conf option '\n'
153 		| conf vhost '\n'
154 		| conf types '\n'
155 		| conf error '\n'		{ file->errors++; }
156 		;
157 
158 include		: INCLUDE STRING		{
159 			struct file	*nfile;
160 
161 			if ((nfile = pushfile($2, 0)) == NULL) {
162 				yyerror("failed to include file %s", $2);
163 				free($2);
164 				YYERROR;
165 			}
166 			free($2);
167 
168 			file = nfile;
169 			lungetc('\n');
170 		}
171 		;
172 
173 bool		: ON	{ $$ = 1; }
174 		| OFF	{ $$ = 0; }
175 		;
176 
177 string		: string STRING	{
178 			if (asprintf(&$$, "%s%s", $1, $2) == -1) {
179 				free($1);
180 				free($2);
181 				yyerror("string: asprintf: %s", strerror(errno));
182 				YYERROR;
183 			}
184 			free($1);
185 			free($2);
186 		}
187 		| STRING
188 		;
189 
190 numberstring	: NUM {
191 			char *s;
192 			if (asprintf(&s, "%d", $1) == -1) {
193 				yyerror("asprintf: number");
194 				YYERROR;
195 			}
196 			$$ = s;
197 		}
198 		| STRING
199 		;
200 
201 varset		: STRING '=' string		{
202 			char *s = $1;
203 			while (*s++) {
204 				if (isspace((unsigned char)*s)) {
205 					yyerror("macro name cannot contain "
206 					    "whitespaces");
207 					free($1);
208 					free($3);
209 					YYERROR;
210 				}
211 			}
212 			symset($1, $3, 0);
213 			free($1);
214 			free($3);
215 		}
216 		;
217 
218 option		: CHROOT string	{
219 			if (strlcpy(conf->chroot, $2, sizeof(conf->chroot)) >=
220 			    sizeof(conf->chroot))
221 				yyerror("chroot path too long");
222 			free($2);
223 		}
224 		| IPV6 bool		{ conf->ipv6 = $2; }
225 		| PORT NUM		{ conf->port = check_port_num($2); }
226 		| PREFORK NUM		{ conf->prefork = check_prefork_num($2); }
227 		| PROTOCOLS string {
228 			if (tls_config_parse_protocols(&conf->protos, $2) == -1)
229 				yyerror("invalid protocols string \"%s\"", $2);
230 			free($2);
231 		}
232 		| USER string {
233 			if (strlcpy(conf->user, $2, sizeof(conf->user)) >=
234 			    sizeof(conf->user))
235 				yyerror("user name too long");
236 			free($2);
237 		}
238 		;
239 
240 vhost		: SERVER string {
241 			host = new_vhost();
242 			TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
243 
244 			loc = new_location();
245 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
246 
247 			TAILQ_INIT(&host->proxies);
248 
249 			(void) strlcpy(loc->match, "*", sizeof(loc->match));
250 			(void) strlcpy(host->domain, $2, sizeof(host->domain));
251 
252 			if (strstr($2, "xn--") != NULL) {
253 				yywarn("\"%s\" looks like punycode: you "
254 				    "should use the decoded hostname", $2);
255 			}
256 
257 			free($2);
258 		} '{' optnl servbody '}' {
259 			if (host->cert_path == NULL ||
260 			    host->key_path == NULL)
261 				yyerror("invalid vhost definition: %s", $2);
262 		}
263 		| error '}'		{ yyerror("bad server directive"); }
264 		;
265 
266 servbody	: /* empty */
267 		| servbody servopt optnl
268 		| servbody location optnl
269 		| servbody proxy optnl
270 		;
271 
272 servopt		: ALIAS string {
273 			struct alist *a;
274 
275 			a = xcalloc(1, sizeof(*a));
276 			(void) strlcpy(a->alias, $2, sizeof(a->alias));
277 			free($2);
278 			TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
279 		}
280 		| CERT string		{
281 			ensure_absolute_path($2);
282 			free(host->cert_path);
283 			host->cert_path = $2;
284 		}
285 		| KEY string		{
286 			ensure_absolute_path($2);
287 			free(host->key_path);
288 			host->key_path = $2;
289 		}
290 		| OCSP string		{
291 			ensure_absolute_path($2);
292 			free(host->ocsp_path);
293 			host->ocsp_path = $2;
294 		}
295 		| PARAM string '=' string {
296 			add_param($2, $4);
297 		}
298 		| locopt
299 		;
300 
301 proxy		: PROXY { advance_proxy(); }
302 		  proxy_matches '{' optnl proxy_opts '}' {
303 			if (*proxy->host == '\0')
304 				yyerror("invalid proxy block: missing `relay-to' option");
305 
306 			if ((proxy->cert_path == NULL && proxy->key_path != NULL) ||
307 			    (proxy->cert_path != NULL && proxy->key_path == NULL))
308 				yyerror("invalid proxy block: missing cert or key");
309 		}
310 		;
311 
312 proxy_matches	: /* empty */
313 		| proxy_matches proxy_match
314 		;
315 
316 proxy_port	: /* empty */	{ $$ = 1965; }
317 		| PORT STRING {
318 			if (($$ = getservice($2)) == -1)
319 				yyerror("invalid port number %s", $2);
320 			free($2);
321 		}
322 		| PORT NUM	{ $$ = $2; }
323 		;
324 
325 proxy_match	: PROTO string {
326 			(void) strlcpy(proxy->match_proto, $2, sizeof(proxy->match_proto));
327 			free($2);
328 		}
329 		| FOR_HOST string proxy_port {
330 			(void) strlcpy(proxy->match_host, $2, sizeof(proxy->match_host));
331 			(void) snprintf(proxy->match_port, sizeof(proxy->match_port),
332 			    "%d", $3);
333 			free($2);
334 		}
335 		;
336 
337 proxy_opts	: /* empty */
338 		| proxy_opts proxy_opt optnl
339 		;
340 
341 proxy_opt	: CERT string {
342 			free(proxy->cert);
343 			ensure_absolute_path($2);
344 			proxy->cert_path = $2;
345 		}
346 		| KEY string {
347 			free(proxy->key);
348 			ensure_absolute_path($2);
349 			proxy->key_path = $2;
350 		}
351 		| PROTOCOLS string {
352 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
353 				yyerror("invalid protocols string \"%s\"", $2);
354 			free($2);
355 		}
356 		| RELAY_TO string proxy_port {
357 			(void) strlcpy(proxy->host, $2, sizeof(proxy->host));
358 			(void) snprintf(proxy->port, sizeof(proxy->port),
359 			    "%d", $3);
360 			free($2);
361 		}
362 		| REQUIRE CLIENT CA string {
363 			ensure_absolute_path($4);
364 			proxy->reqca_path = $4;
365 		}
366 		| SNI string {
367 			(void) strlcpy(proxy->sni, $2, sizeof(proxy->sni));
368 			free($2);
369 		}
370 		| USE_TLS bool {
371 			proxy->notls = !$2;
372 		}
373 		| VERIFYNAME bool {
374 			proxy->noverifyname = !$2;
375 		}
376 		;
377 
378 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
379 			/* drop the starting '/' if any */
380 			if (*$3 == '/')
381 				memmove($3, $3+1, strlen($3));
382 			(void) strlcpy(loc->match, $3, sizeof(loc->match));
383 			free($3);
384 		}
385 		| error '}'
386 		;
387 
388 locopts		: /* empty */
389 		| locopts locopt optnl
390 		;
391 
392 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
393 		| BLOCK RETURN NUM string {
394 			check_block_fmt($4);
395 			(void) strlcpy(loc->block_fmt, $4, sizeof(loc->block_fmt));
396 			loc->block_code = check_block_code($3);
397 			free($4);
398 		}
399 		| BLOCK RETURN NUM {
400 			(void) strlcpy(loc->block_fmt, "temporary failure",
401 			    sizeof(loc->block_fmt));
402 			loc->block_code = check_block_code($3);
403 			if ($3 >= 30 && $3 < 40)
404 				yyerror("missing `meta' for block return %d", $3);
405 		}
406 		| BLOCK {
407 			(void) strlcpy(loc->block_fmt, "temporary failure",
408 			    sizeof(loc->block_fmt));
409 			loc->block_code = 40;
410 		}
411 		| DEFAULT TYPE string {
412 			(void) strlcpy(loc->default_mime, $3,
413 			    sizeof(loc->default_mime));
414 			free($3);
415 		}
416 		| FASTCGI fastcgi
417 		| INDEX string {
418 			(void) strlcpy(loc->index, $2, sizeof(loc->index));
419 			free($2);
420 		}
421 		| LANG string {
422 			(void) strlcpy(loc->lang, $2,
423 			    sizeof(loc->lang));
424 			free($2);
425 		}
426 		| LOG bool	{ loc->disable_log = !$2; }
427 		| REQUIRE CLIENT CA string {
428 			ensure_absolute_path($4);
429 			loc->reqca_path = $4;
430 		}
431 		| ROOT string		{
432 			(void) strlcpy(loc->dir, $2, sizeof(loc->dir));
433 			free($2);
434 		}
435 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
436 		;
437 
438 fastcgi		: string {
439 			loc->fcgi = fastcgi_conf($1, NULL);
440 			free($1);
441 		}
442 		| TCP string PORT NUM {
443 			char *c;
444 			if (asprintf(&c, "%d", $4) == -1)
445 				fatal("asprintf");
446 			loc->fcgi = fastcgi_conf($2, c);
447 			free($2);
448 		}
449 		| TCP string {
450 			loc->fcgi = fastcgi_conf($2, "9000");
451 			free($2);
452 		}
453 		| TCP string PORT string {
454 			loc->fcgi = fastcgi_conf($2, $4);
455 			free($2);
456 			free($4);
457 		}
458 		;
459 
460 types		: TYPES '{' optnl mediaopts_l '}' ;
461 
462 mediaopts_l	: mediaopts_l mediaoptsl nl
463 		| mediaoptsl nl
464 		;
465 
466 mediaoptsl	: STRING {
467 			free(current_media);
468 			current_media = $1;
469 		} medianames_l optsemicolon
470 		| include
471 		;
472 
473 medianames_l	: medianames_l medianamesl
474 		| medianamesl
475 		;
476 
477 medianamesl	: numberstring {
478 			if (add_mime(&conf->mime, current_media, $1) == -1)
479 				fatal("add_mime");
480 			free($1);
481 		}
482 		;
483 
484 nl		: '\n' optnl
485 		;
486 
487 optnl		: '\n' optnl		/* zero or more newlines */
488 		| ';' optnl		/* semicolons too */
489 		| /*empty*/
490 		;
491 
492 optsemicolon	: ';'
493 		|
494 		;
495 
496 %%
497 
498 static const struct keyword {
499 	const char *word;
500 	int token;
501 } keywords[] = {
502 	/* these MUST be sorted */
503 	{"alias", ALIAS},
504 	{"auto", AUTO},
505 	{"block", BLOCK},
506 	{"ca", CA},
507 	{"cert", CERT},
508 	{"chroot", CHROOT},
509 	{"client", CLIENT},
510 	{"default", DEFAULT},
511 	{"fastcgi", FASTCGI},
512 	{"for-host", FOR_HOST},
513 	{"include", INCLUDE},
514 	{"index", INDEX},
515 	{"ipv6", IPV6},
516 	{"key", KEY},
517 	{"lang", LANG},
518 	{"location", LOCATION},
519 	{"log", LOG},
520 	{"ocsp", OCSP},
521 	{"off", OFF},
522 	{"on", ON},
523 	{"param", PARAM},
524 	{"port", PORT},
525 	{"prefork", PREFORK},
526 	{"proto", PROTO},
527 	{"protocols", PROTOCOLS},
528 	{"proxy", PROXY},
529 	{"relay-to", RELAY_TO},
530 	{"require", REQUIRE},
531 	{"return", RETURN},
532 	{"root", ROOT},
533 	{"server", SERVER},
534 	{"sni", SNI},
535 	{"strip", STRIP},
536 	{"tcp", TCP},
537 	{"to-ext", TOEXT},
538 	{"type", TYPE},
539 	{"types", TYPES},
540 	{"use-tls", USE_TLS},
541 	{"user", USER},
542 	{"verifyname", VERIFYNAME},
543 };
544 
545 void
546 yyerror(const char *msg, ...)
547 {
548 	va_list ap;
549 
550 	file->errors++;
551 
552 	va_start(ap, msg);
553 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
554 	vfprintf(stderr, msg, ap);
555 	fprintf(stderr, "\n");
556 	va_end(ap);
557 }
558 
559 void
560 yywarn(const char *msg, ...)
561 {
562 	va_list ap;
563 
564 	va_start(ap, msg);
565 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
566 	vfprintf(stderr, msg, ap);
567 	fprintf(stderr, "\n");
568 	va_end(ap);
569 }
570 
571 int
572 kw_cmp(const void *k, const void *e)
573 {
574 	return strcmp(k, ((struct keyword *)e)->word);
575 }
576 
577 int
578 lookup(char *s)
579 {
580 	const struct keyword	*p;
581 
582 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
583 	    sizeof(keywords[0]), kw_cmp);
584 
585 	if (p)
586 		return p->token;
587 	else
588 		return STRING;
589 }
590 
591 #define START_EXPAND	1
592 #define DONE_EXPAND	2
593 
594 static int	expanding;
595 
596 int
597 igetc(void)
598 {
599 	int	c;
600 
601 	while (1) {
602 		if (file->ungetpos > 0)
603 			c = file->ungetbuf[--file->ungetpos];
604 		else
605 			c = getc(file->stream);
606 
607 		if (c == START_EXPAND)
608 			expanding = 1;
609 		else if (c == DONE_EXPAND)
610 			expanding = 0;
611 		else
612 			break;
613 	}
614 	return c;
615 }
616 
617 int
618 lgetc(int quotec)
619 {
620 	int		c, next;
621 
622 	if (quotec) {
623 		if ((c = igetc()) == EOF) {
624 			yyerror("reached end of file while parsing "
625 			    "quoted string");
626 			if (file == topfile || popfile() == EOF)
627 				return EOF;
628 			return quotec;
629 		}
630 		return c;
631 	}
632 
633 	while ((c = igetc()) == '\\') {
634 		next = igetc();
635 		if (next != '\n') {
636 			c = next;
637 			break;
638 		}
639 		yylval.lineno = file->lineno;
640 		file->lineno++;
641 	}
642 
643 	if (c == EOF) {
644 		/*
645 		 * Fake EOL when hit EOF for the first time. This gets line
646 		 * count right if last line in included file is syntactically
647 		 * invalid and has no newline.
648 		 */
649 		if (file->eof_reached == 0) {
650 			file->eof_reached = 1;
651 			return '\n';
652 		}
653 		while (c == EOF) {
654 			if (file == topfile || popfile() == EOF)
655 				return EOF;
656 			c = igetc();
657 		}
658 	}
659 	return c;
660 }
661 
662 void
663 lungetc(int c)
664 {
665 	if (c == EOF)
666 		return;
667 
668 	if (file->ungetpos >= file->ungetsize) {
669 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
670 		if (p == NULL)
671 			fatal("lungetc");
672 		file->ungetbuf = p;
673 		file->ungetsize *= 2;
674 	}
675 	file->ungetbuf[file->ungetpos++] = c;
676 }
677 
678 int
679 findeol(void)
680 {
681 	int	c;
682 
683 	/* Skip to either EOF or the first real EOL. */
684 	while (1) {
685 		c = lgetc(0);
686 		if (c == '\n') {
687 			file->lineno++;
688 			break;
689 		}
690 		if (c == EOF)
691 			break;
692 	}
693 	return ERROR;
694 }
695 
696 int
697 yylex(void)
698 {
699 	char	 buf[8096];
700 	char	*p, *val;
701 	int	 quotec, next, c;
702 	int	 token;
703 
704 top:
705 	p = buf;
706 	while ((c = lgetc(0)) == ' ' || c == '\t')
707 		; /* nothing */
708 
709 	yylval.lineno = file->lineno;
710 	if (c == '#')
711 		while ((c = lgetc(0)) != '\n' && c != EOF)
712 			; /* nothing */
713 	if (c == '$' && !expanding) {
714 		while (1) {
715 			if ((c = lgetc(0)) == EOF)
716 				return 0;
717 			if (p + 1 >= buf + sizeof(buf) -1) {
718 				yyerror("string too long");
719 				return findeol();
720 			}
721 			if (isalnum(c) || c == '_') {
722 				*p++ = c;
723 				continue;
724 			}
725 			*p = '\0';
726 			lungetc(c);
727 			break;
728 		}
729 		val = symget(buf);
730 		if (val == NULL) {
731 			yyerror("macro `%s' not defined", buf);
732 			return findeol();
733 		}
734 		yylval.v.string = xstrdup(val);
735 		return STRING;
736 	}
737 	if (c == '@' && !expanding) {
738 		while (1) {
739 			if ((c = lgetc(0)) == EOF)
740 				return 0;
741 
742 			if (p + 1 >= buf + sizeof(buf) - 1) {
743 				yyerror("string too long");
744 				return findeol();
745 			}
746 			if (isalnum(c) || c == '_') {
747 				*p++ = c;
748 				continue;
749 			}
750 			*p = '\0';
751 			lungetc(c);
752 			break;
753 		}
754 		val = symget(buf);
755 		if (val == NULL) {
756 			yyerror("macro '%s' not defined", buf);
757 			return findeol();
758 		}
759 		p = val + strlen(val) - 1;
760 		lungetc(DONE_EXPAND);
761 		while (p >= val) {
762 			lungetc(*p);
763 			p--;
764 		}
765 		lungetc(START_EXPAND);
766 		goto top;
767 	}
768 
769 	switch (c) {
770 	case '\'':
771 	case '"':
772 		quotec = c;
773 		while (1) {
774 			if ((c = lgetc(quotec)) == EOF)
775 				return 0;
776 			if (c == '\n') {
777 				file->lineno++;
778 				continue;
779 			} else if (c == '\\') {
780 				if ((next = lgetc(quotec)) == EOF)
781 					return (0);
782 				if (next == quotec || next == ' ' ||
783 				    next == '\t')
784 					c = next;
785 				else if (next == '\n') {
786 					file->lineno++;
787 					continue;
788 				} else
789 					lungetc(next);
790 			} else if (c == quotec) {
791 				*p = '\0';
792 				break;
793 			} else if (c == '\0') {
794 				yyerror("invalid syntax");
795 				return findeol();
796 			}
797 			if (p + 1 >= buf + sizeof(buf) - 1) {
798 				yyerror("string too long");
799 				return findeol();
800 			}
801 			*p++ = c;
802 		}
803 		yylval.v.string = strdup(buf);
804 		if (yylval.v.string == NULL)
805 			fatal("yylex: strdup");
806 		return STRING;
807 	}
808 
809 #define allowed_to_end_number(x) \
810 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
811 
812 	if (c == '-' || isdigit(c)) {
813 		do {
814 			*p++ = c;
815 			if ((size_t)(p-buf) >= sizeof(buf)) {
816 				yyerror("string too long");
817 				return findeol();
818 			}
819 		} while ((c = lgetc(0)) != EOF && isdigit(c));
820 		lungetc(c);
821 		if (p == buf + 1 && buf[0] == '-')
822 			goto nodigits;
823 		if (c == EOF || allowed_to_end_number(c)) {
824 			const char *errstr = NULL;
825 
826 			*p = '\0';
827 			yylval.v.number = strtonum(buf, LLONG_MIN,
828 			    LLONG_MAX, &errstr);
829 			if (errstr) {
830 				yyerror("\"%s\" invalid number: %s",
831 				    buf, errstr);
832 				return findeol();
833 			}
834 			return NUM;
835 		} else {
836 nodigits:
837 			while (p > buf + 1)
838 				lungetc(*--p);
839 			c = *--p;
840 			if (c == '-')
841 				return c;
842 		}
843 	}
844 
845 #define allowed_in_string(x) \
846 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
847 	x != '{' && x != '}' && \
848 	x != '!' && x != '=' && x != '#' && \
849 	x != ',' && x != ';'))
850 
851 	if (isalnum(c) || c == ':' || c == '_') {
852 		do {
853 			*p++ = c;
854 			if ((size_t)(p-buf) >= sizeof(buf)) {
855 				yyerror("string too long");
856 				return findeol();
857 			}
858 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
859 		lungetc(c);
860 		*p = '\0';
861 		if ((token = lookup(buf)) == STRING)
862 			yylval.v.string = xstrdup(buf);
863 		return token;
864 	}
865 	if (c == '\n') {
866 		yylval.lineno = file->lineno;
867 		file->lineno++;
868 	}
869 	if (c == EOF)
870 		return 0;
871 	return c;
872 }
873 
874 struct file *
875 pushfile(const char *name, int secret)
876 {
877 	struct file	*nfile;
878 
879 	nfile = xcalloc(1, sizeof(*nfile));
880 	nfile->name = xstrdup(name);
881 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
882 		log_warn("can't open %s", nfile->name);
883 		free(nfile->name);
884 		free(nfile);
885 		return NULL;
886 	}
887 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
888 	nfile->ungetsize = 16;
889 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
890 	TAILQ_INSERT_TAIL(&files, nfile, entry);
891 	return nfile;
892 }
893 
894 int
895 popfile(void)
896 {
897 	struct file	*prev;
898 
899 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
900 		prev->errors += file->errors;
901 
902 	TAILQ_REMOVE(&files, file, entry);
903 	fclose(file->stream);
904 	free(file->name);
905 	free(file->ungetbuf);
906 	free(file);
907 	file = prev;
908 	return file ? 0 : EOF;
909 }
910 
911 int
912 parse_conf(struct conf *c, const char *filename)
913 {
914 	struct sym		*sym, *next;
915 
916 	conf = c;
917 
918 	file = pushfile(filename, 0);
919 	if (file == NULL)
920 		return -1;
921 	topfile = file;
922 
923 	yyparse();
924 	errors = file->errors;
925 	popfile();
926 
927 	/* Free macros and check which have not been used. */
928 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
929 		/* TODO: warn if !sym->used */
930 		if (!sym->persist) {
931 			free(sym->name);
932 			free(sym->val);
933 			TAILQ_REMOVE(&symhead, sym, entry);
934 			free(sym);
935 		}
936 	}
937 
938 	if (errors)
939 		return -1;
940 	return 0;
941 }
942 
943 int
944 symset(const char *name, const char *val, int persist)
945 {
946 	struct sym *sym;
947 
948 	TAILQ_FOREACH(sym, &symhead, entry) {
949 		if (!strcmp(name, sym->name))
950 			break;
951 	}
952 
953 	if (sym != NULL) {
954 		if (sym->persist)
955 			return 0;
956 		else {
957 			free(sym->name);
958 			free(sym->val);
959 			TAILQ_REMOVE(&symhead, sym, entry);
960 			free(sym);
961 		}
962 	}
963 
964 	sym = xcalloc(1, sizeof(*sym));
965 	sym->name = xstrdup(name);
966 	sym->val = xstrdup(val);
967 	sym->used = 0;
968 	sym->persist = persist;
969 
970 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
971 	return 0;
972 }
973 
974 int
975 cmdline_symset(char *s)
976 {
977 	char	*sym, *val;
978 	int	 ret;
979 
980 	if ((val = strrchr(s, '=')) == NULL)
981 		return -1;
982 	sym = xcalloc(1, val - s + 1);
983 	memcpy(sym, s, val - s);
984 	ret = symset(sym, val + 1, 1);
985 	free(sym);
986 	return ret;
987 }
988 
989 char *
990 symget(const char *nam)
991 {
992 	struct sym	*sym;
993 
994 	TAILQ_FOREACH(sym, &symhead, entry) {
995 		if (strcmp(nam, sym->name) == 0) {
996 			sym->used = 1;
997 			return sym->val;
998 		}
999 	}
1000 	return NULL;
1001 }
1002 
1003 char *
1004 ensure_absolute_path(char *path)
1005 {
1006 	if (path == NULL || *path != '/')
1007 		yyerror("not an absolute path: %s", path);
1008 	return path;
1009 }
1010 
1011 int
1012 check_block_code(int n)
1013 {
1014 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1015 		yyerror("invalid block code %d", n);
1016 	return n;
1017 }
1018 
1019 char *
1020 check_block_fmt(char *fmt)
1021 {
1022 	char *s;
1023 
1024 	for (s = fmt; *s; ++s) {
1025 		if (*s != '%')
1026 			continue;
1027 		switch (*++s) {
1028 		case '%':
1029 		case 'p':
1030 		case 'q':
1031 		case 'P':
1032 		case 'N':
1033 			break;
1034 		default:
1035 			yyerror("invalid format specifier %%%c", *s);
1036 		}
1037 	}
1038 
1039 	return fmt;
1040 }
1041 
1042 int
1043 check_strip_no(int n)
1044 {
1045 	if (n <= 0)
1046 		yyerror("invalid strip number %d", n);
1047 	return n;
1048 }
1049 
1050 int
1051 check_port_num(int n)
1052 {
1053 	if (n <= 0 || n >= UINT16_MAX)
1054 		yyerror("port number is %s: %d",
1055 		    n <= 0 ? "too small" : "too large",
1056 		    n);
1057 	return n;
1058 }
1059 
1060 int
1061 check_prefork_num(int n)
1062 {
1063 	if (n <= 0 || n >= PROC_MAX_INSTANCES)
1064 		yyerror("invalid prefork number %d", n);
1065 	return n;
1066 }
1067 
1068 void
1069 advance_loc(void)
1070 {
1071 	loc = new_location();
1072 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1073 }
1074 
1075 void
1076 advance_proxy(void)
1077 {
1078 	proxy = new_proxy();
1079 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1080 }
1081 
1082 void
1083 parsehp(char *str, char **host, const char **port, const char *def)
1084 {
1085 	char		*at;
1086 	const char	*errstr;
1087 
1088 	*host = str;
1089 
1090 	if ((at = strchr(str, ':')) != NULL) {
1091 		*at++ = '\0';
1092 		*port = at;
1093 	} else
1094 		*port = def;
1095 
1096 	strtonum(*port, 1, UINT16_MAX, &errstr);
1097 	if (errstr != NULL)
1098 		yyerror("port is %s: %s", errstr, *port);
1099 }
1100 
1101 int
1102 fastcgi_conf(const char *path, const char *port)
1103 {
1104 	struct fcgi	*f;
1105 	int		i = 0;
1106 
1107 	TAILQ_FOREACH(f, &conf->fcgi, fcgi) {
1108 		if (!strcmp(f->path, path) &&
1109 		    ((port == NULL && *f->port == '\0') ||
1110 		     !strcmp(f->port, port)))
1111 			return i;
1112 		++i;
1113 	}
1114 
1115 	f = xcalloc(1, sizeof(*f));
1116 	f->id = i;
1117 	(void)strlcpy(f->path, path, sizeof(f->path));
1118 	if (port != NULL)
1119 		(void)strlcpy(f->port, port, sizeof(f->port));
1120 	TAILQ_INSERT_TAIL(&conf->fcgi, f, fcgi);
1121 
1122 	return f->id;
1123 }
1124 
1125 void
1126 add_param(char *name, char *val)
1127 {
1128 	struct envlist *e;
1129 	struct envhead *h = &host->params;
1130 
1131 	e = xcalloc(1, sizeof(*e));
1132 	(void) strlcpy(e->name, name, sizeof(e->name));
1133 	(void) strlcpy(e->value, val, sizeof(e->value));
1134 	TAILQ_INSERT_TAIL(h, e, envs);
1135 }
1136 
1137 int
1138 getservice(const char *n)
1139 {
1140 	struct servent	*s;
1141 	const char	*errstr;
1142 	long long	 llval;
1143 
1144 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1145 	if (errstr) {
1146 		s = getservbyname(n, "tcp");
1147 		if (s == NULL)
1148 			s = getservbyname(n, "udp");
1149 		if (s == NULL)
1150 			return (-1);
1151 		return (ntohs(s->s_port));
1152 	}
1153 
1154 	return ((unsigned short)llval);
1155 }