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 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
37 static struct file {
38 	TAILQ_ENTRY(file)	 entry;
39 	FILE			*stream;
40 	char			*name;
41 	size_t	 		 ungetpos;
42 	size_t			 ungetsize;
43 	u_char			*ungetbuf;
44 	int			 eof_reached;
45 	int			 lineno;
46 	int			 errors;
47 } *file, *topfile;
48 
49 struct file	*pushfile(const char *, int);
50 int		 popfile(void);
51 int		 yyparse(void);
52 int		 yylex(void);
53 void		 yyerror(const char *, ...)
54     __attribute__((__format__ (printf, 1, 2)))
55     __attribute__((__nonnull__ (1)));
56 void		 yywarn(const char *, ...)
57     __attribute__((__format__ (printf, 1, 2)))
58     __attribute__((__nonnull__ (1)));
59 int		 kw_cmp(const void *, const void *);
60 int		 lookup(char *);
61 int		 igetc(void);
62 int		 lgetc(int);
63 void		 lungetc(int);
64 int		 findeol(void);
65 
66 /*
67  * #define YYDEBUG 1
68  * int yydebug = 1;
69  */
70 
71 TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
72 struct sym {
73 	TAILQ_ENTRY(sym)	 entry;
74 	int			 used;
75 	int			 persist;
76 	char			*name;
77 	char			*val;
78 };
79 
80 int	 symset(const char *, const char *, int);
81 char	*symget(const char *);
82 
83 struct vhost	*new_vhost(void);
84 struct location	*new_location(void);
85 struct proxy	*new_proxy(void);
86 char		*ensure_absolute_path(char*);
87 int		 check_block_code(int);
88 char		*check_block_fmt(char*);
89 int		 check_strip_no(int);
90 int		 check_port_num(int);
91 int		 check_prefork_num(int);
92 void		 advance_loc(void);
93 void		 advance_proxy(void);
94 void		 parsehp(char *, char **, const char **, const char *);
95 int		 fastcgi_conf(const char *, const char *, char *);
96 void		 add_param(char *, char *);
97 int		 getservice(const char *);
98 
99 static struct vhost		*host;
100 static struct location		*loc;
101 static struct proxy		*proxy;
102 static char			*current_media;
103 static int			 errors;
104 
105 typedef struct {
106 	union {
107 		char	*string;
108 		int	 number;
109 	} v;
110 	int lineno;
111 } YYSTYPE;
112 
113 %}
114 
115 /* for bison: */
116 /* %define parse.error verbose */
117 
118 %token	ALIAS AUTO
119 %token	BLOCK
120 %token	CA CERT CHROOT CLIENT
121 %token	DEFAULT
122 %token	FASTCGI FOR_HOST
123 %token	INCLUDE INDEX IPV6
124 %token	KEY
125 %token	LANG LOCATION LOG
126 %token	OCSP OFF ON
127 %token	PARAM PORT PREFORK PROTO PROTOCOLS PROXY
128 %token	RELAY_TO REQUIRE RETURN ROOT
129 %token	SERVER SNI SPAWN STRIP
130 %token	TCP TOEXT TYPE TYPES
131 %token	USE_TLS USER
132 %token	VERIFYNAME
133 
134 %token	ERROR
135 
136 %token	<v.string>	STRING
137 %token	<v.number>	NUM
138 
139 %type	<v.number>	bool proxy_port
140 %type	<v.string>	string numberstring
141 
142 %%
143 
144 conf		: /* empty */
145 		| conf include '\n'
146 		| conf '\n'
147 		| conf varset '\n'
148 		| conf option '\n'
149 		| conf vhost '\n'
150 		| conf types '\n'
151 		| conf error '\n'		{ file->errors++; }
152 		;
153 
154 include		: INCLUDE STRING		{
155 			struct file	*nfile;
156 
157 			if ((nfile = pushfile($2, 0)) == NULL) {
158 				yyerror("failed to include file %s", $2);
159 				free($2);
160 				YYERROR;
161 			}
162 			free($2);
163 
164 			file = nfile;
165 			lungetc('\n');
166 		}
167 		;
168 
169 bool		: ON	{ $$ = 1; }
170 		| OFF	{ $$ = 0; }
171 		;
172 
173 string		: string STRING	{
174 			if (asprintf(&$$, "%s%s", $1, $2) == -1) {
175 				free($1);
176 				free($2);
177 				yyerror("string: asprintf: %s", strerror(errno));
178 				YYERROR;
179 			}
180 			free($1);
181 			free($2);
182 		}
183 		| STRING
184 		;
185 
186 numberstring	: NUM {
187 			char *s;
188 			if (asprintf(&s, "%d", $1) == -1) {
189 				yyerror("asprintf: number");
190 				YYERROR;
191 			}
192 			$$ = s;
193 		}
194 		| STRING
195 		;
196 
197 varset		: STRING '=' string		{
198 			char *s = $1;
199 			while (*s++) {
200 				if (isspace((unsigned char)*s)) {
201 					yyerror("macro name cannot contain "
202 					    "whitespaces");
203 					free($1);
204 					free($3);
205 					YYERROR;
206 				}
207 			}
208 			symset($1, $3, 0);
209 			free($1);
210 			free($3);
211 		}
212 		;
213 
214 option		: CHROOT string	{
215 			if (strlcpy(conf.chroot, $2, sizeof(conf.chroot)) >=
216 			    sizeof(conf.chroot))
217 				yyerror("chroot path too long");
218 			free($2);
219 		}
220 		| IPV6 bool		{ conf.ipv6 = $2; }
221 		| PORT NUM		{ conf.port = check_port_num($2); }
222 		| PREFORK NUM		{ conf.prefork = check_prefork_num($2); }
223 		| PROTOCOLS string {
224 			if (tls_config_parse_protocols(&conf.protos, $2) == -1)
225 				yyerror("invalid protocols string \"%s\"", $2);
226 			free($2);
227 		}
228 		| USER string {
229 			if (strlcpy(conf.user, $2, sizeof(conf.user)) >=
230 			    sizeof(conf.user))
231 				yyerror("user name too long");
232 			free($2);
233 		}
234 		;
235 
236 vhost		: SERVER string {
237 			host = new_vhost();
238 			TAILQ_INSERT_HEAD(&hosts, host, vhosts);
239 
240 			loc = new_location();
241 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
242 
243 			TAILQ_INIT(&host->proxies);
244 
245 			(void) strlcpy(loc->match, "*", sizeof(loc->match));
246 			(void) strlcpy(host->domain, $2, sizeof(host->domain));
247 
248 			if (strstr($2, "xn--") != NULL) {
249 				yywarn("\"%s\" looks like punycode: you "
250 				    "should use the decoded hostname", $2);
251 			}
252 
253 			free($2);
254 		} '{' optnl servbody '}' {
255 			if (*host->cert == '\0' || *host->key == '\0')
256 				yyerror("invalid vhost definition: %s", $2);
257 		}
258 		| error '}'		{ yyerror("bad server directive"); }
259 		;
260 
261 servbody	: /* empty */
262 		| servbody servopt optnl
263 		| servbody location optnl
264 		| servbody proxy optnl
265 		;
266 
267 servopt		: ALIAS string {
268 			struct alist *a;
269 
270 			a = xcalloc(1, sizeof(*a));
271 			(void) strlcpy(a->alias, $2, sizeof(a->alias));
272 			free($2);
273 			TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
274 		}
275 		| CERT string		{
276 			ensure_absolute_path($2);
277 			(void) strlcpy(host->cert, $2, sizeof(host->cert));
278 			free($2);
279 		}
280 		| KEY string		{
281 			ensure_absolute_path($2);
282 			(void) strlcpy(host->key, $2, sizeof(host->key));
283 			free($2);
284 		}
285 		| OCSP string		{
286 			ensure_absolute_path($2);
287 			(void) strlcpy(host->ocsp, $2, sizeof(host->ocsp));
288 			free($2);
289 		}
290 		| PARAM string '=' string {
291 			add_param($2, $4);
292 		}
293 		| locopt
294 		;
295 
296 proxy		: PROXY { advance_proxy(); }
297 		  proxy_matches '{' optnl proxy_opts '}' {
298 			if (*proxy->host == '\0')
299 				yyerror("invalid proxy block: missing `relay-to' option");
300 
301 			if ((proxy->cert == NULL && proxy->key != NULL) ||
302 			    (proxy->cert != NULL && proxy->key == NULL))
303 				yyerror("invalid proxy block: missing cert or key");
304 		}
305 		;
306 
307 proxy_matches	: /* empty */
308 		| proxy_matches proxy_match
309 		;
310 
311 proxy_port	: /* empty */	{ $$ = 1965; }
312 		| PORT STRING {
313 			if (($$ = getservice($2)) == -1)
314 				yyerror("invalid port number %s", $2);
315 			free($2);
316 		}
317 		| PORT NUM	{ $$ = $2; }
318 		;
319 
320 proxy_match	: PROTO string {
321 			(void) strlcpy(proxy->match_proto, $2, sizeof(proxy->match_proto));
322 			free($2);
323 		}
324 		| FOR_HOST string proxy_port {
325 			(void) strlcpy(proxy->match_host, $2, sizeof(proxy->match_host));
326 			(void) snprintf(proxy->match_port, sizeof(proxy->match_port),
327 			    "%d", $3);
328 			free($2);
329 		}
330 		;
331 
332 proxy_opts	: /* empty */
333 		| proxy_opts proxy_opt optnl
334 		;
335 
336 proxy_opt	: CERT string {
337 			tls_unload_file(proxy->cert, proxy->certlen);
338 			ensure_absolute_path($2);
339 			proxy->cert = tls_load_file($2, &proxy->certlen, NULL);
340 			if (proxy->cert == NULL)
341 				yyerror("can't load cert %s", $2);
342 			free($2);
343 		}
344 		| KEY string {
345 			tls_unload_file(proxy->key, proxy->keylen);
346 			ensure_absolute_path($2);
347 			proxy->key = tls_load_file($2, &proxy->keylen, NULL);
348 			if (proxy->key == NULL)
349 				yyerror("can't load key %s", $2);
350 			free($2);
351 		}
352 		| PROTOCOLS string {
353 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
354 				yyerror("invalid protocols string \"%s\"", $2);
355 			free($2);
356 		}
357 		| RELAY_TO string proxy_port {
358 			(void) strlcpy(proxy->host, $2, sizeof(proxy->host));
359 			(void) snprintf(proxy->port, sizeof(proxy->port),
360 			    "%d", $3);
361 			free($2);
362 		}
363 		| REQUIRE CLIENT CA string {
364 			ensure_absolute_path($4);
365 			if ((proxy->reqca = load_ca($4)) == NULL)
366 				yyerror("couldn't load ca cert: %s", $4);
367 			free($4);
368 		}
369 		| SNI string {
370 			(void) strlcpy(proxy->sni, $2, sizeof(proxy->sni));
371 			free($2);
372 		}
373 		| USE_TLS bool {
374 			proxy->notls = !$2;
375 		}
376 		| VERIFYNAME bool {
377 			proxy->noverifyname = !$2;
378 		}
379 		;
380 
381 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
382 			/* drop the starting '/' if any */
383 			if (*$3 == '/')
384 				memmove($3, $3+1, strlen($3));
385 			(void) strlcpy(loc->match, $3, sizeof(loc->match));
386 			free($3);
387 		}
388 		| error '}'
389 		;
390 
391 locopts		: /* empty */
392 		| locopts locopt optnl
393 		;
394 
395 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
396 		| BLOCK RETURN NUM string {
397 			check_block_fmt($4);
398 			(void) strlcpy(loc->block_fmt, $4, sizeof(loc->block_fmt));
399 			loc->block_code = check_block_code($3);
400 			free($4);
401 		}
402 		| BLOCK RETURN NUM {
403 			(void) strlcpy(loc->block_fmt, "temporary failure",
404 			    sizeof(loc->block_fmt));
405 			loc->block_code = check_block_code($3);
406 			if ($3 >= 30 && $3 < 40)
407 				yyerror("missing `meta' for block return %d", $3);
408 		}
409 		| BLOCK {
410 			(void) strlcpy(loc->block_fmt, "temporary failure",
411 			    sizeof(loc->block_fmt));
412 			loc->block_code = 40;
413 		}
414 		| DEFAULT TYPE string {
415 			(void) strlcpy(loc->default_mime, $3,
416 			    sizeof(loc->default_mime));
417 			free($3);
418 		}
419 		| FASTCGI fastcgi
420 		| INDEX string {
421 			(void) strlcpy(loc->index, $2, sizeof(loc->index));
422 			free($2);
423 		}
424 		| LANG string {
425 			(void) strlcpy(loc->lang, $2,
426 			    sizeof(loc->lang));
427 			free($2);
428 		}
429 		| LOG bool	{ loc->disable_log = !$2; }
430 		| REQUIRE CLIENT CA string {
431 			ensure_absolute_path($4);
432 			if ((loc->reqca = load_ca($4)) == NULL)
433 				yyerror("couldn't load ca cert: %s", $4);
434 			free($4);
435 		}
436 		| ROOT string		{
437 			(void) strlcpy(loc->dir, $2, sizeof(loc->dir));
438 			free($2);
439 		}
440 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
441 		;
442 
443 fastcgi		: SPAWN string {
444 			loc->fcgi = fastcgi_conf(NULL, NULL, $2);
445 			free($2);
446 		}
447 		| string {
448 			loc->fcgi = fastcgi_conf($1, NULL, NULL);
449 			free($1);
450 		}
451 		| TCP string PORT NUM {
452 			char *c;
453 			if (asprintf(&c, "%d", $4) == -1)
454 				err(1, "asprintf");
455 			loc->fcgi = fastcgi_conf($2, c, NULL);
456 			free($2);
457 		}
458 		| TCP string {
459 			loc->fcgi = fastcgi_conf($2, "9000", NULL);
460 			free($2);
461 		}
462 		| TCP string PORT string {
463 			loc->fcgi = fastcgi_conf($2, $4, NULL);
464 			free($2);
465 			free($4);
466 		}
467 		;
468 
469 types		: TYPES '{' optnl mediaopts_l '}' ;
470 
471 mediaopts_l	: mediaopts_l mediaoptsl nl
472 		| mediaoptsl nl
473 		;
474 
475 mediaoptsl	: STRING {
476 			free(current_media);
477 			current_media = $1;
478 		} medianames_l optsemicolon
479 		| include
480 		;
481 
482 medianames_l	: medianames_l medianamesl
483 		| medianamesl
484 		;
485 
486 medianamesl	: numberstring {
487 			if (add_mime(&conf.mime, current_media, $1) == -1)
488 				err(1, "add_mime");
489 			free($1);
490 		}
491 		;
492 
493 nl		: '\n' optnl
494 		;
495 
496 optnl		: '\n' optnl		/* zero or more newlines */
497 		| ';' optnl		/* semicolons too */
498 		| /*empty*/
499 		;
500 
501 optsemicolon	: ';'
502 		|
503 		;
504 
505 %%
506 
507 static const struct keyword {
508 	const char *word;
509 	int token;
510 } keywords[] = {
511 	/* these MUST be sorted */
512 	{"alias", ALIAS},
513 	{"auto", AUTO},
514 	{"block", BLOCK},
515 	{"ca", CA},
516 	{"cert", CERT},
517 	{"chroot", CHROOT},
518 	{"client", CLIENT},
519 	{"default", DEFAULT},
520 	{"fastcgi", FASTCGI},
521 	{"for-host", FOR_HOST},
522 	{"include", INCLUDE},
523 	{"index", INDEX},
524 	{"ipv6", IPV6},
525 	{"key", KEY},
526 	{"lang", LANG},
527 	{"location", LOCATION},
528 	{"log", LOG},
529 	{"ocsp", OCSP},
530 	{"off", OFF},
531 	{"on", ON},
532 	{"param", PARAM},
533 	{"port", PORT},
534 	{"prefork", PREFORK},
535 	{"proto", PROTO},
536 	{"protocols", PROTOCOLS},
537 	{"proxy", PROXY},
538 	{"relay-to", RELAY_TO},
539 	{"require", REQUIRE},
540 	{"return", RETURN},
541 	{"root", ROOT},
542 	{"server", SERVER},
543 	{"sni", SNI},
544 	{"spawn", SPAWN},
545 	{"strip", STRIP},
546 	{"tcp", TCP},
547 	{"to-ext", TOEXT},
548 	{"type", TYPE},
549 	{"types", TYPES},
550 	{"use-tls", USE_TLS},
551 	{"user", USER},
552 	{"verifyname", VERIFYNAME},
553 };
554 
555 void
556 yyerror(const char *msg, ...)
557 {
558 	va_list ap;
559 
560 	file->errors++;
561 
562 	va_start(ap, msg);
563 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
564 	vfprintf(stderr, msg, ap);
565 	fprintf(stderr, "\n");
566 	va_end(ap);
567 }
568 
569 void
570 yywarn(const char *msg, ...)
571 {
572 	va_list ap;
573 
574 	va_start(ap, msg);
575 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
576 	vfprintf(stderr, msg, ap);
577 	fprintf(stderr, "\n");
578 	va_end(ap);
579 }
580 
581 int
582 kw_cmp(const void *k, const void *e)
583 {
584 	return strcmp(k, ((struct keyword *)e)->word);
585 }
586 
587 int
588 lookup(char *s)
589 {
590 	const struct keyword	*p;
591 
592 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
593 	    sizeof(keywords[0]), kw_cmp);
594 
595 	if (p)
596 		return p->token;
597 	else
598 		return STRING;
599 }
600 
601 #define START_EXPAND	1
602 #define DONE_EXPAND	2
603 
604 static int	expanding;
605 
606 int
607 igetc(void)
608 {
609 	int	c;
610 
611 	while (1) {
612 		if (file->ungetpos > 0)
613 			c = file->ungetbuf[--file->ungetpos];
614 		else
615 			c = getc(file->stream);
616 
617 		if (c == START_EXPAND)
618 			expanding = 1;
619 		else if (c == DONE_EXPAND)
620 			expanding = 0;
621 		else
622 			break;
623 	}
624 	return c;
625 }
626 
627 int
628 lgetc(int quotec)
629 {
630 	int		c, next;
631 
632 	if (quotec) {
633 		if ((c = igetc()) == EOF) {
634 			yyerror("reached end of file while parsing "
635 			    "quoted string");
636 			if (file == topfile || popfile() == EOF)
637 				return EOF;
638 			return quotec;
639 		}
640 		return c;
641 	}
642 
643 	while ((c = igetc()) == '\\') {
644 		next = igetc();
645 		if (next != '\n') {
646 			c = next;
647 			break;
648 		}
649 		yylval.lineno = file->lineno;
650 		file->lineno++;
651 	}
652 
653 	if (c == EOF) {
654 		/*
655 		 * Fake EOL when hit EOF for the first time. This gets line
656 		 * count right if last line in included file is syntactically
657 		 * invalid and has no newline.
658 		 */
659 		if (file->eof_reached == 0) {
660 			file->eof_reached = 1;
661 			return '\n';
662 		}
663 		while (c == EOF) {
664 			if (file == topfile || popfile() == EOF)
665 				return EOF;
666 			c = igetc();
667 		}
668 	}
669 	return c;
670 }
671 
672 void
673 lungetc(int c)
674 {
675 	if (c == EOF)
676 		return;
677 
678 	if (file->ungetpos >= file->ungetsize) {
679 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
680 		if (p == NULL)
681 			err(1, "lungetc");
682 		file->ungetbuf = p;
683 		file->ungetsize *= 2;
684 	}
685 	file->ungetbuf[file->ungetpos++] = c;
686 }
687 
688 int
689 findeol(void)
690 {
691 	int	c;
692 
693 	/* Skip to either EOF or the first real EOL. */
694 	while (1) {
695 		c = lgetc(0);
696 		if (c == '\n') {
697 			file->lineno++;
698 			break;
699 		}
700 		if (c == EOF)
701 			break;
702 	}
703 	return ERROR;
704 }
705 
706 int
707 yylex(void)
708 {
709 	char	 buf[8096];
710 	char	*p, *val;
711 	int	 quotec, next, c;
712 	int	 token;
713 
714 top:
715 	p = buf;
716 	while ((c = lgetc(0)) == ' ' || c == '\t')
717 		; /* nothing */
718 
719 	yylval.lineno = file->lineno;
720 	if (c == '#')
721 		while ((c = lgetc(0)) != '\n' && c != EOF)
722 			; /* nothing */
723 	if (c == '$' && !expanding) {
724 		while (1) {
725 			if ((c = lgetc(0)) == EOF)
726 				return 0;
727 			if (p + 1 >= buf + sizeof(buf) -1) {
728 				yyerror("string too long");
729 				return findeol();
730 			}
731 			if (isalnum(c) || c == '_') {
732 				*p++ = c;
733 				continue;
734 			}
735 			*p = '\0';
736 			lungetc(c);
737 			break;
738 		}
739 		val = symget(buf);
740 		if (val == NULL) {
741 			yyerror("macro `%s' not defined", buf);
742 			return findeol();
743 		}
744 		yylval.v.string = xstrdup(val);
745 		return STRING;
746 	}
747 	if (c == '@' && !expanding) {
748 		while (1) {
749 			if ((c = lgetc(0)) == EOF)
750 				return 0;
751 
752 			if (p + 1 >= buf + sizeof(buf) - 1) {
753 				yyerror("string too long");
754 				return findeol();
755 			}
756 			if (isalnum(c) || c == '_') {
757 				*p++ = c;
758 				continue;
759 			}
760 			*p = '\0';
761 			lungetc(c);
762 			break;
763 		}
764 		val = symget(buf);
765 		if (val == NULL) {
766 			yyerror("macro '%s' not defined", buf);
767 			return findeol();
768 		}
769 		p = val + strlen(val) - 1;
770 		lungetc(DONE_EXPAND);
771 		while (p >= val) {
772 			lungetc(*p);
773 			p--;
774 		}
775 		lungetc(START_EXPAND);
776 		goto top;
777 	}
778 
779 	switch (c) {
780 	case '\'':
781 	case '"':
782 		quotec = c;
783 		while (1) {
784 			if ((c = lgetc(quotec)) == EOF)
785 				return 0;
786 			if (c == '\n') {
787 				file->lineno++;
788 				continue;
789 			} else if (c == '\\') {
790 				if ((next = lgetc(quotec)) == EOF)
791 					return (0);
792 				if (next == quotec || next == ' ' ||
793 				    next == '\t')
794 					c = next;
795 				else if (next == '\n') {
796 					file->lineno++;
797 					continue;
798 				} else
799 					lungetc(next);
800 			} else if (c == quotec) {
801 				*p = '\0';
802 				break;
803 			} else if (c == '\0') {
804 				yyerror("invalid syntax");
805 				return findeol();
806 			}
807 			if (p + 1 >= buf + sizeof(buf) - 1) {
808 				yyerror("string too long");
809 				return findeol();
810 			}
811 			*p++ = c;
812 		}
813 		yylval.v.string = strdup(buf);
814 		if (yylval.v.string == NULL)
815 			err(1, "yylex: strdup");
816 		return STRING;
817 	}
818 
819 #define allowed_to_end_number(x) \
820 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
821 
822 	if (c == '-' || isdigit(c)) {
823 		do {
824 			*p++ = c;
825 			if ((size_t)(p-buf) >= sizeof(buf)) {
826 				yyerror("string too long");
827 				return findeol();
828 			}
829 		} while ((c = lgetc(0)) != EOF && isdigit(c));
830 		lungetc(c);
831 		if (p == buf + 1 && buf[0] == '-')
832 			goto nodigits;
833 		if (c == EOF || allowed_to_end_number(c)) {
834 			const char *errstr = NULL;
835 
836 			*p = '\0';
837 			yylval.v.number = strtonum(buf, LLONG_MIN,
838 			    LLONG_MAX, &errstr);
839 			if (errstr) {
840 				yyerror("\"%s\" invalid number: %s",
841 				    buf, errstr);
842 				return findeol();
843 			}
844 			return NUM;
845 		} else {
846 nodigits:
847 			while (p > buf + 1)
848 				lungetc(*--p);
849 			c = *--p;
850 			if (c == '-')
851 				return c;
852 		}
853 	}
854 
855 #define allowed_in_string(x) \
856 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
857 	x != '{' && x != '}' && \
858 	x != '!' && x != '=' && x != '#' && \
859 	x != ',' && x != ';'))
860 
861 	if (isalnum(c) || c == ':' || c == '_') {
862 		do {
863 			*p++ = c;
864 			if ((size_t)(p-buf) >= sizeof(buf)) {
865 				yyerror("string too long");
866 				return findeol();
867 			}
868 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
869 		lungetc(c);
870 		*p = '\0';
871 		if ((token = lookup(buf)) == STRING)
872 			yylval.v.string = xstrdup(buf);
873 		return token;
874 	}
875 	if (c == '\n') {
876 		yylval.lineno = file->lineno;
877 		file->lineno++;
878 	}
879 	if (c == EOF)
880 		return 0;
881 	return c;
882 }
883 
884 struct file *
885 pushfile(const char *name, int secret)
886 {
887 	struct file	*nfile;
888 
889 	nfile = xcalloc(1, sizeof(*nfile));
890 	nfile->name = xstrdup(name);
891 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
892 		log_warn(NULL, "can't open %s: %s", nfile->name,
893 		    strerror(errno));
894 		free(nfile->name);
895 		free(nfile);
896 		return NULL;
897 	}
898 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
899 	nfile->ungetsize = 16;
900 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
901 	TAILQ_INSERT_TAIL(&files, nfile, entry);
902 	return nfile;
903 }
904 
905 int
906 popfile(void)
907 {
908 	struct file	*prev;
909 
910 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
911 		prev->errors += file->errors;
912 
913 	TAILQ_REMOVE(&files, file, entry);
914 	fclose(file->stream);
915 	free(file->name);
916 	free(file->ungetbuf);
917 	free(file);
918 	file = prev;
919 	return file ? 0 : EOF;
920 }
921 
922 void
923 parse_conf(const char *filename)
924 {
925 	struct sym		*sym, *next;
926 
927 	file = pushfile(filename, 0);
928 	if (file == NULL)
929 		exit(1);
930 	topfile = file;
931 
932 	yyparse();
933 	errors = file->errors;
934 	popfile();
935 
936 	/* Free macros and check which have not been used. */
937 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
938 		/* TODO: warn if !sym->used */
939 		if (!sym->persist) {
940 			free(sym->name);
941 			free(sym->val);
942 			TAILQ_REMOVE(&symhead, sym, entry);
943 			free(sym);
944 		}
945 	}
946 
947 	if (errors)
948 		exit(1);
949 }
950 
951 void
952 print_conf(void)
953 {
954 	struct vhost	*h;
955 	/* struct location	*l; */
956 	/* struct envlist	*e; */
957 	/* struct alist	*a; */
958 
959 	if (*conf.chroot != '\0')
960 		printf("chroot \"%s\"\n", conf.chroot);
961 	printf("ipv6 %s\n", conf.ipv6 ? "on" : "off");
962 	/* XXX: defined mimes? */
963 	printf("port %d\n", conf.port);
964 	printf("prefork %d\n", conf.prefork);
965 	/* XXX: protocols? */
966 	if (*conf.user != '\0')
967 		printf("user \"%s\"\n", conf.user);
968 
969 	TAILQ_FOREACH(h, &hosts, vhosts) {
970 		printf("\nserver \"%s\" {\n", h->domain);
971 		printf("	cert \"%s\"\n", h->cert);
972 		printf("	key \"%s\"\n", h->key);
973 		/* TODO: print locations... */
974 		printf("}\n");
975 	}
976 }
977 
978 int
979 symset(const char *name, const char *val, int persist)
980 {
981 	struct sym *sym;
982 
983 	TAILQ_FOREACH(sym, &symhead, entry) {
984 		if (!strcmp(name, sym->name))
985 			break;
986 	}
987 
988 	if (sym != NULL) {
989 		if (sym->persist)
990 			return 0;
991 		else {
992 			free(sym->name);
993 			free(sym->val);
994 			TAILQ_REMOVE(&symhead, sym, entry);
995 			free(sym);
996 		}
997 	}
998 
999 	sym = xcalloc(1, sizeof(*sym));
1000 	sym->name = xstrdup(name);
1001 	sym->val = xstrdup(val);
1002 	sym->used = 0;
1003 	sym->persist = persist;
1004 
1005 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1006 	return 0;
1007 }
1008 
1009 int
1010 cmdline_symset(char *s)
1011 {
1012 	char	*sym, *val;
1013 	int	 ret;
1014 
1015 	if ((val = strrchr(s, '=')) == NULL)
1016 		return -1;
1017 	sym = xcalloc(1, val - s + 1);
1018 	memcpy(sym, s, val - s);
1019 	ret = symset(sym, val + 1, 1);
1020 	free(sym);
1021 	return ret;
1022 }
1023 
1024 char *
1025 symget(const char *nam)
1026 {
1027 	struct sym	*sym;
1028 
1029 	TAILQ_FOREACH(sym, &symhead, entry) {
1030 		if (strcmp(nam, sym->name) == 0) {
1031 			sym->used = 1;
1032 			return sym->val;
1033 		}
1034 	}
1035 	return NULL;
1036 }
1037 
1038 struct vhost *
1039 new_vhost(void)
1040 {
1041 	struct vhost *h;
1042 
1043 	h = xcalloc(1, sizeof(*h));
1044 	TAILQ_INIT(&h->locations);
1045 	TAILQ_INIT(&h->params);
1046 	TAILQ_INIT(&h->aliases);
1047 	TAILQ_INIT(&h->proxies);
1048 	return h;
1049 }
1050 
1051 struct location *
1052 new_location(void)
1053 {
1054 	struct location *l;
1055 
1056 	l = xcalloc(1, sizeof(*l));
1057 	l->dirfd = -1;
1058 	l->fcgi = -1;
1059 	return l;
1060 }
1061 
1062 struct proxy *
1063 new_proxy(void)
1064 {
1065 	struct proxy *p;
1066 
1067 	conf.can_open_sockets = 1;
1068 
1069 	p = xcalloc(1, sizeof(*p));
1070 	p->protocols = TLS_PROTOCOLS_DEFAULT;
1071 	return p;
1072 }
1073 
1074 char *
1075 ensure_absolute_path(char *path)
1076 {
1077 	if (path == NULL || *path != '/')
1078 		yyerror("not an absolute path: %s", path);
1079 	return path;
1080 }
1081 
1082 int
1083 check_block_code(int n)
1084 {
1085 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1086 		yyerror("invalid block code %d", n);
1087 	return n;
1088 }
1089 
1090 char *
1091 check_block_fmt(char *fmt)
1092 {
1093 	char *s;
1094 
1095 	for (s = fmt; *s; ++s) {
1096 		if (*s != '%')
1097 			continue;
1098 		switch (*++s) {
1099 		case '%':
1100 		case 'p':
1101 		case 'q':
1102 		case 'P':
1103 		case 'N':
1104 			break;
1105 		default:
1106 			yyerror("invalid format specifier %%%c", *s);
1107 		}
1108 	}
1109 
1110 	return fmt;
1111 }
1112 
1113 int
1114 check_strip_no(int n)
1115 {
1116 	if (n <= 0)
1117 		yyerror("invalid strip number %d", n);
1118 	return n;
1119 }
1120 
1121 int
1122 check_port_num(int n)
1123 {
1124 	if (n <= 0 || n >= UINT16_MAX)
1125 		yyerror("port number is %s: %d",
1126 		    n <= 0 ? "too small" : "too large",
1127 		    n);
1128 	return n;
1129 }
1130 
1131 int
1132 check_prefork_num(int n)
1133 {
1134 	if (n <= 0 || n >= PROC_MAX)
1135 		yyerror("invalid prefork number %d", n);
1136 	return n;
1137 }
1138 
1139 void
1140 advance_loc(void)
1141 {
1142 	loc = new_location();
1143 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1144 }
1145 
1146 void
1147 advance_proxy(void)
1148 {
1149 	proxy = new_proxy();
1150 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1151 }
1152 
1153 void
1154 parsehp(char *str, char **host, const char **port, const char *def)
1155 {
1156 	char		*at;
1157 	const char	*errstr;
1158 
1159 	*host = str;
1160 
1161 	if ((at = strchr(str, ':')) != NULL) {
1162 		*at++ = '\0';
1163 		*port = at;
1164 	} else
1165 		*port = def;
1166 
1167 	strtonum(*port, 1, UINT16_MAX, &errstr);
1168 	if (errstr != NULL)
1169 		yyerror("port is %s: %s", errstr, *port);
1170 }
1171 
1172 int
1173 fastcgi_conf(const char *path, const char *port, char *prog)
1174 {
1175 	struct fcgi	*f;
1176 	int		i;
1177 
1178 	conf.can_open_sockets = 1;
1179 
1180 	for (i = 0; i < FCGI_MAX; ++i) {
1181 		f = &fcgi[i];
1182 
1183 		if (*f->path == '\0') {
1184 			f->id = i;
1185 			(void) strlcpy(f->path, path, sizeof(f->path));
1186 			(void) strlcpy(f->port, port, sizeof(f->port));
1187 			return i;
1188 		}
1189 
1190 		if (!strcmp(f->path, path) &&
1191 		    ((port == NULL && *f->port == '\0') ||
1192 		     !strcmp(f->port, port)))
1193 			return i;
1194 	}
1195 
1196 	yyerror("too much `fastcgi' rules defined.");
1197 	return -1;
1198 }
1199 
1200 void
1201 add_param(char *name, char *val)
1202 {
1203 	struct envlist *e;
1204 	struct envhead *h = &host->params;
1205 
1206 	e = xcalloc(1, sizeof(*e));
1207 	(void) strlcpy(e->name, name, sizeof(e->name));
1208 	(void) strlcpy(e->value, val, sizeof(e->value));
1209 	TAILQ_INSERT_TAIL(h, e, envs);
1210 }
1211 
1212 int
1213 getservice(const char *n)
1214 {
1215 	struct servent	*s;
1216 	const char	*errstr;
1217 	long long	 llval;
1218 
1219 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1220 	if (errstr) {
1221 		s = getservbyname(n, "tcp");
1222 		if (s == NULL)
1223 			s = getservbyname(n, "udp");
1224 		if (s == NULL)
1225 			return (-1);
1226 		return (ntohs(s->s_port));
1227 	}
1228 
1229 	return ((unsigned short)llval);
1230 }