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