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 <stdarg.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.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 struct proxy	*new_proxy(void);
85 char		*ensure_absolute_path(char*);
86 int		 check_block_code(int);
87 char		*check_block_fmt(char*);
88 int		 check_strip_no(int);
89 int		 check_port_num(int);
90 int		 check_prefork_num(int);
91 void		 advance_loc(void);
92 void		 advance_proxy(void);
93 void		 parsehp(char *, char **, const char **, const char *);
94 void		 only_once(const void*, const char*);
95 void		 only_oncei(int, const char*);
96 int		 fastcgi_conf(char *, char *, char *);
97 void		 add_param(char *, char *, int);
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 CGI CHROOT CLIENT
121 %token	DEFAULT
122 %token	ENTRYPOINT ENV
123 %token	FASTCGI FOR_HOST
124 %token	INCLUDE INDEX IPV6
125 %token	KEY
126 %token	LANG LOCATION LOG
127 %token	MAP MIME
128 %token	OCSP OFF ON
129 %token	PARAM PORT PREFORK PROTO PROTOCOLS PROXY
130 %token	RELAY_TO REQUIRE RETURN ROOT
131 %token	SERVER SNI SPAWN 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
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	{ conf.chroot = $2; }
217 		| IPV6 bool		{ conf.ipv6 = $2; }
218 		| MIME STRING string	{
219 			yywarn("`mime MIME EXT' is deprecated and will be "
220 			    "removed in a future version, please use the new "
221 			    "syntax: `map MIME to-ext EXT'");
222 			add_mime(&conf.mime, $2, $3);
223 		}
224 		| MAP string TOEXT string { add_mime(&conf.mime, $2, $4); }
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		{ conf.user = $2; }
233 		;
234 
235 vhost		: SERVER string {
236 			host = new_vhost();
237 			TAILQ_INSERT_HEAD(&hosts, host, vhosts);
238 
239 			loc = new_location();
240 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
241 
242 			TAILQ_INIT(&host->proxies);
243 
244 			loc->match = xstrdup("*");
245 			host->domain = $2;
246 
247 			if (strstr($2, "xn--") != NULL) {
248 				yywarn("\"%s\" looks like punycode: you "
249 				    "should use the decoded hostname", $2);
250 			}
251 		} '{' optnl servbody '}' {
252 			if (host->cert == NULL || host->key == NULL)
253 				yyerror("invalid vhost definition: %s", $2);
254 		}
255 		| error '}'		{ yyerror("bad server directive"); }
256 		;
257 
258 servbody	: /* empty */
259 		| servbody servopt optnl
260 		| servbody location optnl
261 		| servbody proxy optnl
262 		;
263 
264 servopt		: ALIAS string {
265 			struct alist *a;
266 
267 			a = xcalloc(1, sizeof(*a));
268 			a->alias = $2;
269 			if (TAILQ_EMPTY(&host->aliases))
270 				TAILQ_INSERT_HEAD(&host->aliases, a, aliases);
271 			else
272 				TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
273 		}
274 		| CERT string		{
275 			only_once(host->cert, "cert");
276 			host->cert = ensure_absolute_path($2);
277 		}
278 		| CGI string		{
279 			only_once(host->cgi, "cgi");
280 			/* drop the starting '/', if any */
281 			if (*$2 == '/')
282 				memmove($2, $2+1, strlen($2));
283 			host->cgi = $2;
284 		}
285 		| ENTRYPOINT string {
286 			only_once(host->entrypoint, "entrypoint");
287 			while (*$2 == '/')
288 				memmove($2, $2+1, strlen($2));
289 			host->entrypoint = $2;
290 		}
291 		| ENV string '=' string {
292 			add_param($2, $4, 1);
293 		}
294 		| KEY string		{
295 			only_once(host->key, "key");
296 			host->key  = ensure_absolute_path($2);
297 		}
298 		| OCSP string		{
299 			only_once(host->ocsp, "ocsp");
300 			host->ocsp = ensure_absolute_path($2);
301 		}
302 		| PARAM string '=' string {
303 			add_param($2, $4, 0);
304 		}
305 		| locopt
306 		;
307 
308 proxy		: PROXY { advance_proxy(); }
309 		  proxy_matches '{' optnl proxy_opts '}' {
310 			if (proxy->host == NULL)
311 				yyerror("invalid proxy block: missing `relay-to' option");
312 
313 			if ((proxy->cert == NULL && proxy->key != NULL) ||
314 			    (proxy->cert != NULL && proxy->key == NULL))
315 				yyerror("invalid proxy block: missing cert or key");
316 		}
317 		;
318 
319 proxy_matches	: /* empty */
320 		| proxy_matches proxy_match
321 		;
322 
323 proxy_match	: PROTO string {
324 			only_once(proxy->match_proto, "proxy proto");
325 			free(proxy->match_proto);
326 			proxy->match_proto = $2;
327 		}
328 		| FOR_HOST string {
329 			only_once(proxy->match_host, "proxy for-host");
330 			free(proxy->match_host);
331 			parsehp($2, &proxy->match_host, &proxy->match_port, "10965");
332 		}
333 		;
334 
335 proxy_opts	: /* empty */
336 		| proxy_opts proxy_opt optnl
337 		;
338 
339 proxy_opt	: CERT string {
340 			only_once(proxy->cert, "proxy cert");
341 			tls_unload_file(proxy->cert, proxy->certlen);
342 			ensure_absolute_path($2);
343 			proxy->cert = tls_load_file($2, &proxy->certlen, NULL);
344 			if (proxy->cert == NULL)
345 				yyerror("can't load cert %s", $2);
346 			free($2);
347 		}
348 		| KEY string {
349 			only_once(proxy->key, "proxy key");
350 			tls_unload_file(proxy->key, proxy->keylen);
351 			ensure_absolute_path($2);
352 			proxy->key = tls_load_file($2, &proxy->keylen, NULL);
353 			if (proxy->key == NULL)
354 				yyerror("can't load key %s", $2);
355 			free($2);
356 		}
357 		| PROTOCOLS string {
358 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
359 				yyerror("invalid protocols string \"%s\"", $2);
360 			free($2);
361 		}
362 		| RELAY_TO string {
363 			only_once(proxy->host, "proxy relay-to");
364 			free(proxy->host);
365 			parsehp($2, &proxy->host, &proxy->port, "1965");
366 		}
367 		| REQUIRE CLIENT CA string {
368 			only_once(proxy->reqca, "require client ca");
369 			ensure_absolute_path($4);
370 			if ((proxy->reqca = load_ca($4)) == NULL)
371 				yyerror("couldn't load ca cert: %s", $4);
372 			free($4);
373 		}
374 		| SNI string {
375 			only_once(proxy->sni, "proxy sni");
376 			free(proxy->sni);
377 			proxy->sni = $2;
378 		}
379 		| USE_TLS bool {
380 			proxy->notls = !$2;
381 		}
382 		| VERIFYNAME bool {
383 			proxy->noverifyname = !$2;
384 		}
385 		;
386 
387 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
388 			/* drop the starting '/' if any */
389 			if (*$3 == '/')
390 				memmove($3, $3+1, strlen($3));
391 			loc->match = $3;
392 		}
393 		| error '}'
394 		;
395 
396 locopts		: /* empty */
397 		| locopts locopt optnl
398 		;
399 
400 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
401 		| BLOCK RETURN NUM string {
402 			only_once(loc->block_fmt, "block");
403 			loc->block_fmt = check_block_fmt($4);
404 			loc->block_code = check_block_code($3);
405 		}
406 		| BLOCK RETURN NUM {
407 			only_once(loc->block_fmt, "block");
408 			loc->block_fmt = xstrdup("temporary failure");
409 			loc->block_code = check_block_code($3);
410 			if ($3 >= 30 && $3 < 40)
411 				yyerror("missing `meta' for block return %d", $3);
412 		}
413 		| BLOCK {
414 			only_once(loc->block_fmt, "block");
415 			loc->block_fmt = xstrdup("temporary failure");
416 			loc->block_code = 40;
417 		}
418 		| DEFAULT TYPE string {
419 			only_once(loc->default_mime, "default type");
420 			loc->default_mime = $3;
421 		}
422 		| FASTCGI fastcgi
423 		| INDEX string {
424 			only_once(loc->index, "index");
425 			loc->index = $2;
426 		}
427 		| LANG string {
428 			only_once(loc->lang, "lang");
429 			loc->lang = $2;
430 		}
431 		| LOG bool	{ loc->disable_log = !$2; }
432 		| REQUIRE CLIENT CA string {
433 			only_once(loc->reqca, "require client ca");
434 			ensure_absolute_path($4);
435 			if ((loc->reqca = load_ca($4)) == NULL)
436 				yyerror("couldn't load ca cert: %s", $4);
437 			free($4);
438 		}
439 		| ROOT string		{
440 			only_once(loc->dir, "root");
441 			loc->dir  = ensure_absolute_path($2);
442 		}
443 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
444 		;
445 
446 fastcgi		: SPAWN string {
447 			only_oncei(loc->fcgi, "fastcgi");
448 			loc->fcgi = fastcgi_conf(NULL, NULL, $2);
449 		}
450 		| string {
451 			only_oncei(loc->fcgi, "fastcgi");
452 			loc->fcgi = fastcgi_conf($1, NULL, NULL);
453 		}
454 		| TCP string PORT NUM {
455 			char *c;
456 			if (asprintf(&c, "%d", $4) == -1)
457 				err(1, "asprintf");
458 			only_oncei(loc->fcgi, "fastcgi");
459 			loc->fcgi = fastcgi_conf($2, c, NULL);
460 		}
461 		| TCP string {
462 			only_oncei(loc->fcgi, "fastcgi");
463 			loc->fcgi = fastcgi_conf($2, xstrdup("9000"), NULL);
464 		}
465 		| TCP string PORT string {
466 			only_oncei(loc->fcgi, "fastcgi");
467 			loc->fcgi = fastcgi_conf($2, $4, NULL);
468 		}
469 		;
470 
471 types		: TYPES '{' optnl mediaopts_l '}'
472 		;
473 
474 mediaopts_l	: mediaopts_l mediaoptsl nl
475 		| mediaoptsl nl
476 		;
477 
478 mediaoptsl	: STRING { current_media = $1; } medianames_l optsemicolon
479 		| include
480 		;
481 
482 medianames_l	: medianames_l medianamesl
483 		| medianamesl
484 		;
485 
486 medianamesl	: numberstring { add_mime(&conf.mime, current_media, $1); }
487 		;
488 
489 nl		: '\n' optnl
490 		;
491 
492 optnl		: '\n' optnl		/* zero or more newlines */
493 		| ';' optnl		/* semicolons too */
494 		| /*empty*/
495 		;
496 
497 optsemicolon	: ';'
498 		|
499 		;
500 
501 %%
502 
503 static const struct keyword {
504 	const char *word;
505 	int token;
506 } keywords[] = {
507 	/* these MUST be sorted */
508 	{"alias", ALIAS},
509 	{"auto", AUTO},
510 	{"block", BLOCK},
511 	{"ca", CA},
512 	{"cert", CERT},
513 	{"cgi", CGI},
514 	{"chroot", CHROOT},
515 	{"client", CLIENT},
516 	{"default", DEFAULT},
517 	{"entrypoint", ENTRYPOINT},
518 	{"env", ENV},
519 	{"fastcgi", FASTCGI},
520 	{"for-host", FOR_HOST},
521 	{"include", INCLUDE},
522 	{"index", INDEX},
523 	{"ipv6", IPV6},
524 	{"key", KEY},
525 	{"lang", LANG},
526 	{"location", LOCATION},
527 	{"log", LOG},
528 	{"map", MAP},
529 	{"mime", MIME},
530 	{"ocsp", OCSP},
531 	{"off", OFF},
532 	{"on", ON},
533 	{"param", PARAM},
534 	{"port", PORT},
535 	{"prefork", PREFORK},
536 	{"proto", PROTO},
537 	{"protocols", PROTOCOLS},
538 	{"proxy", PROXY},
539 	{"relay-to", RELAY_TO},
540 	{"require", REQUIRE},
541 	{"return", RETURN},
542 	{"root", ROOT},
543 	{"server", SERVER},
544 	{"sni", SNI},
545 	{"spawn", SPAWN},
546 	{"strip", STRIP},
547 	{"tcp", TCP},
548 	{"to-ext", TOEXT},
549 	{"type", TYPE},
550 	{"types", TYPES},
551 	{"use-tls", USE_TLS},
552 	{"user", USER},
553 	{"verifyname", VERIFYNAME},
554 };
555 
556 void
557 yyerror(const char *msg, ...)
558 {
559 	va_list ap;
560 
561 	file->errors++;
562 
563 	va_start(ap, msg);
564 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
565 	vfprintf(stderr, msg, ap);
566 	fprintf(stderr, "\n");
567 	va_end(ap);
568 }
569 
570 void
571 yywarn(const char *msg, ...)
572 {
573 	va_list ap;
574 
575 	va_start(ap, msg);
576 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
577 	vfprintf(stderr, msg, ap);
578 	fprintf(stderr, "\n");
579 	va_end(ap);
580 }
581 
582 int
583 kw_cmp(const void *k, const void *e)
584 {
585 	return strcmp(k, ((struct keyword *)e)->word);
586 }
587 
588 int
589 lookup(char *s)
590 {
591 	const struct keyword	*p;
592 
593 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
594 	    sizeof(keywords[0]), kw_cmp);
595 
596 	if (p)
597 		return p->token;
598 	else
599 		return STRING;
600 }
601 
602 #define START_EXPAND	1
603 #define DONE_EXPAND	2
604 
605 static int	expanding;
606 
607 int
608 igetc(void)
609 {
610 	int	c;
611 
612 	while (1) {
613 		if (file->ungetpos > 0)
614 			c = file->ungetbuf[--file->ungetpos];
615 		else
616 			c = getc(file->stream);
617 
618 		if (c == START_EXPAND)
619 			expanding = 1;
620 		else if (c == DONE_EXPAND)
621 			expanding = 0;
622 		else
623 			break;
624 	}
625 	return c;
626 }
627 
628 int
629 lgetc(int quotec)
630 {
631 	int		c, next;
632 
633 	if (quotec) {
634 		if ((c = igetc()) == EOF) {
635 			yyerror("reached end of file while parsing "
636 			    "quoted string");
637 			if (file == topfile || popfile() == EOF)
638 				return EOF;
639 			return quotec;
640 		}
641 		return c;
642 	}
643 
644 	while ((c = igetc()) == '\\') {
645 		next = igetc();
646 		if (next != '\n') {
647 			c = next;
648 			break;
649 		}
650 		yylval.lineno = file->lineno;
651 		file->lineno++;
652 	}
653 
654 	if (c == EOF) {
655 		/*
656 		 * Fake EOL when hit EOF for the first time. This gets line
657 		 * count right if last line in included file is syntactically
658 		 * invalid and has no newline.
659 		 */
660 		if (file->eof_reached == 0) {
661 			file->eof_reached = 1;
662 			return '\n';
663 		}
664 		while (c == EOF) {
665 			if (file == topfile || popfile() == EOF)
666 				return EOF;
667 			c = igetc();
668 		}
669 	}
670 	return c;
671 }
672 
673 void
674 lungetc(int c)
675 {
676 	if (c == EOF)
677 		return;
678 
679 	if (file->ungetpos >= file->ungetsize) {
680 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
681 		if (p == NULL)
682 			err(1, "lungetc");
683 		file->ungetbuf = p;
684 		file->ungetsize *= 2;
685 	}
686 	file->ungetbuf[file->ungetpos++] = c;
687 }
688 
689 int
690 findeol(void)
691 {
692 	int	c;
693 
694 	/* Skip to either EOF or the first real EOL. */
695 	while (1) {
696 		c = lgetc(0);
697 		if (c == '\n') {
698 			file->lineno++;
699 			break;
700 		}
701 		if (c == EOF)
702 			break;
703 	}
704 	return ERROR;
705 }
706 
707 int
708 yylex(void)
709 {
710 	char	 buf[8096];
711 	char	*p, *val;
712 	int	 quotec, next, c;
713 	int	 token;
714 
715 top:
716 	p = buf;
717 	while ((c = lgetc(0)) == ' ' || c == '\t')
718 		; /* nothing */
719 
720 	yylval.lineno = file->lineno;
721 	if (c == '#')
722 		while ((c = lgetc(0)) != '\n' && c != EOF)
723 			; /* nothing */
724 	if (c == '$' && !expanding) {
725 		while (1) {
726 			if ((c = lgetc(0)) == EOF)
727 				return 0;
728 			if (p + 1 >= buf + sizeof(buf) -1) {
729 				yyerror("string too long");
730 				return findeol();
731 			}
732 			if (isalnum(c) || c == '_') {
733 				*p++ = c;
734 				continue;
735 			}
736 			*p = '\0';
737 			lungetc(c);
738 			break;
739 		}
740 		val = symget(buf);
741 		if (val == NULL) {
742 			yyerror("macro `%s' not defined", buf);
743 			return findeol();
744 		}
745 		yylval.v.string = xstrdup(val);
746 		return STRING;
747 	}
748 	if (c == '@' && !expanding) {
749 		while (1) {
750 			if ((c = lgetc(0)) == EOF)
751 				return 0;
752 
753 			if (p + 1 >= buf + sizeof(buf) - 1) {
754 				yyerror("string too long");
755 				return findeol();
756 			}
757 			if (isalnum(c) || c == '_') {
758 				*p++ = c;
759 				continue;
760 			}
761 			*p = '\0';
762 			lungetc(c);
763 			break;
764 		}
765 		val = symget(buf);
766 		if (val == NULL) {
767 			yyerror("macro '%s' not defined", buf);
768 			return findeol();
769 		}
770 		p = val + strlen(val) - 1;
771 		lungetc(DONE_EXPAND);
772 		while (p >= val) {
773 			lungetc(*p);
774 			p--;
775 		}
776 		lungetc(START_EXPAND);
777 		goto top;
778 	}
779 
780 	switch (c) {
781 	case '\'':
782 	case '"':
783 		quotec = c;
784 		while (1) {
785 			if ((c = lgetc(quotec)) == EOF)
786 				return 0;
787 			if (c == '\n') {
788 				file->lineno++;
789 				continue;
790 			} else if (c == '\\') {
791 				if ((next = lgetc(quotec)) == EOF)
792 					return (0);
793 				if (next == quotec || next == ' ' ||
794 				    next == '\t')
795 					c = next;
796 				else if (next == '\n') {
797 					file->lineno++;
798 					continue;
799 				} else
800 					lungetc(next);
801 			} else if (c == quotec) {
802 				*p = '\0';
803 				break;
804 			} else if (c == '\0') {
805 				yyerror("invalid syntax");
806 				return findeol();
807 			}
808 			if (p + 1 >= buf + sizeof(buf) - 1) {
809 				yyerror("string too long");
810 				return findeol();
811 			}
812 			*p++ = c;
813 		}
814 		yylval.v.string = strdup(buf);
815 		if (yylval.v.string == NULL)
816 			err(1, "yylex: strdup");
817 		return STRING;
818 	}
819 
820 #define allowed_to_end_number(x) \
821 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
822 
823 	if (c == '-' || isdigit(c)) {
824 		do {
825 			*p++ = c;
826 			if ((size_t)(p-buf) >= sizeof(buf)) {
827 				yyerror("string too long");
828 				return findeol();
829 			}
830 		} while ((c = lgetc(0)) != EOF && isdigit(c));
831 		lungetc(c);
832 		if (p == buf + 1 && buf[0] == '-')
833 			goto nodigits;
834 		if (c == EOF || allowed_to_end_number(c)) {
835 			const char *errstr = NULL;
836 
837 			*p = '\0';
838 			yylval.v.number = strtonum(buf, LLONG_MIN,
839 			    LLONG_MAX, &errstr);
840 			if (errstr) {
841 				yyerror("\"%s\" invalid number: %s",
842 				    buf, errstr);
843 				return findeol();
844 			}
845 			return NUM;
846 		} else {
847 nodigits:
848 			while (p > buf + 1)
849 				lungetc(*--p);
850 			c = *--p;
851 			if (c == '-')
852 				return c;
853 		}
854 	}
855 
856 #define allowed_in_string(x) \
857 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
858 	x != '{' && x != '}' && \
859 	x != '!' && x != '=' && x != '#' && \
860 	x != ',' && x != ';'))
861 
862 	if (isalnum(c) || c == ':' || c == '_') {
863 		do {
864 			*p++ = c;
865 			if ((size_t)(p-buf) >= sizeof(buf)) {
866 				yyerror("string too long");
867 				return findeol();
868 			}
869 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
870 		lungetc(c);
871 		*p = '\0';
872 		if ((token = lookup(buf)) == STRING)
873 			yylval.v.string = xstrdup(buf);
874 		return token;
875 	}
876 	if (c == '\n') {
877 		yylval.lineno = file->lineno;
878 		file->lineno++;
879 	}
880 	if (c == EOF)
881 		return 0;
882 	return c;
883 }
884 
885 struct file *
886 pushfile(const char *name, int secret)
887 {
888 	struct file	*nfile;
889 
890 	nfile = xcalloc(1, sizeof(*nfile));
891 	nfile->name = xstrdup(name);
892 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
893 		log_warn(NULL, "can't open %s: %s", nfile->name,
894 		    strerror(errno));
895 		free(nfile->name);
896 		free(nfile);
897 		return NULL;
898 	}
899 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
900 	nfile->ungetsize = 16;
901 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
902 	TAILQ_INSERT_TAIL(&files, nfile, entry);
903 	return nfile;
904 }
905 
906 int
907 popfile(void)
908 {
909 	struct file	*prev;
910 
911 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
912 		prev->errors += file->errors;
913 
914 	TAILQ_REMOVE(&files, file, entry);
915 	fclose(file->stream);
916 	free(file->name);
917 	free(file->ungetbuf);
918 	free(file);
919 	file = prev;
920 	return file ? 0 : EOF;
921 }
922 
923 void
924 parse_conf(const char *filename)
925 {
926 	struct sym		*sym, *next;
927 
928 	file = pushfile(filename, 0);
929 	if (file == NULL)
930 		exit(1);
931 	topfile = file;
932 
933 	yyparse();
934 	errors = file->errors;
935 	popfile();
936 
937 	/* Free macros and check which have not been used. */
938 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
939 		/* TODO: warn if !sym->used */
940 		if (!sym->persist) {
941 			free(sym->name);
942 			free(sym->val);
943 			TAILQ_REMOVE(&symhead, sym, entry);
944 			free(sym);
945 		}
946 	}
947 
948 	if (errors)
949 		exit(1);
950 }
951 
952 void
953 print_conf(void)
954 {
955 	struct vhost	*h;
956 	/* struct location	*l; */
957 	/* struct envlist	*e; */
958 	/* struct alist	*a; */
959 
960 	if (conf.chroot != NULL)
961 		printf("chroot \"%s\"\n", conf.chroot);
962 	printf("ipv6 %s\n", conf.ipv6 ? "on" : "off");
963 	/* XXX: defined mimes? */
964 	printf("port %d\n", conf.port);
965 	printf("prefork %d\n", conf.prefork);
966 	/* XXX: protocols? */
967 	if (conf.user != NULL)
968 		printf("user \"%s\"\n", conf.user);
969 
970 	TAILQ_FOREACH(h, &hosts, vhosts) {
971 		printf("\nserver \"%s\" {\n", h->domain);
972 		printf("	cert \"%s\"\n", h->cert);
973 		printf("	key \"%s\"\n", h->key);
974 		/* TODO: print locations... */
975 		printf("}\n");
976 	}
977 }
978 
979 int
980 symset(const char *name, const char *val, int persist)
981 {
982 	struct sym *sym;
983 
984 	TAILQ_FOREACH(sym, &symhead, entry) {
985 		if (!strcmp(name, sym->name))
986 			break;
987 	}
988 
989 	if (sym != NULL) {
990 		if (sym->persist)
991 			return 0;
992 		else {
993 			free(sym->name);
994 			free(sym->val);
995 			TAILQ_REMOVE(&symhead, sym, entry);
996 			free(sym);
997 		}
998 	}
999 
1000 	sym = xcalloc(1, sizeof(*sym));
1001 	sym->name = xstrdup(name);
1002 	sym->val = xstrdup(val);
1003 	sym->used = 0;
1004 	sym->persist = persist;
1005 
1006 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1007 	return 0;
1008 }
1009 
1010 int
1011 cmdline_symset(char *s)
1012 {
1013 	char	*sym, *val;
1014 	int	 ret;
1015 
1016 	if ((val = strrchr(s, '=')) == NULL)
1017 		return -1;
1018 	sym = xcalloc(1, val - s + 1);
1019 	memcpy(sym, s, val - s);
1020 	ret = symset(sym, val + 1, 1);
1021 	free(sym);
1022 	return ret;
1023 }
1024 
1025 char *
1026 symget(const char *nam)
1027 {
1028 	struct sym	*sym;
1029 
1030 	TAILQ_FOREACH(sym, &symhead, entry) {
1031 		if (strcmp(nam, sym->name) == 0) {
1032 			sym->used = 1;
1033 			return sym->val;
1034 		}
1035 	}
1036 	return NULL;
1037 }
1038 
1039 struct vhost *
1040 new_vhost(void)
1041 {
1042 	return xcalloc(1, sizeof(struct vhost));
1043 }
1044 
1045 struct location *
1046 new_location(void)
1047 {
1048 	struct location *l;
1049 
1050 	l = xcalloc(1, sizeof(*l));
1051 	l->dirfd = -1;
1052 	l->fcgi = -1;
1053 	return l;
1054 }
1055 
1056 struct proxy *
1057 new_proxy(void)
1058 {
1059 	struct proxy *p;
1060 
1061 	p = xcalloc(1, sizeof(*p));
1062 	p->protocols = TLS_PROTOCOLS_DEFAULT;
1063 	return p;
1064 }
1065 
1066 char *
1067 ensure_absolute_path(char *path)
1068 {
1069 	if (path == NULL || *path != '/')
1070 		yyerror("not an absolute path: %s", path);
1071 	return path;
1072 }
1073 
1074 int
1075 check_block_code(int n)
1076 {
1077 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1078 		yyerror("invalid block code %d", n);
1079 	return n;
1080 }
1081 
1082 char *
1083 check_block_fmt(char *fmt)
1084 {
1085 	char *s;
1086 
1087 	for (s = fmt; *s; ++s) {
1088 		if (*s != '%')
1089 			continue;
1090 		switch (*++s) {
1091 		case '%':
1092 		case 'p':
1093 		case 'q':
1094 		case 'P':
1095 		case 'N':
1096 			break;
1097 		default:
1098 			yyerror("invalid format specifier %%%c", *s);
1099 		}
1100 	}
1101 
1102 	return fmt;
1103 }
1104 
1105 int
1106 check_strip_no(int n)
1107 {
1108 	if (n <= 0)
1109 		yyerror("invalid strip number %d", n);
1110 	return n;
1111 }
1112 
1113 int
1114 check_port_num(int n)
1115 {
1116 	if (n <= 0 || n >= UINT16_MAX)
1117 		yyerror("port number is %s: %d",
1118 		    n <= 0 ? "too small" : "too large",
1119 		    n);
1120 	return n;
1121 }
1122 
1123 int
1124 check_prefork_num(int n)
1125 {
1126 	if (n <= 0 || n >= PROC_MAX)
1127 		yyerror("invalid prefork number %d", n);
1128 	return n;
1129 }
1130 
1131 void
1132 advance_loc(void)
1133 {
1134 	loc = new_location();
1135 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1136 }
1137 
1138 void
1139 advance_proxy(void)
1140 {
1141 	proxy = new_proxy();
1142 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1143 }
1144 
1145 void
1146 parsehp(char *str, char **host, const char **port, const char *def)
1147 {
1148 	char		*at;
1149 	const char	*errstr;
1150 
1151 	*host = str;
1152 
1153 	if ((at = strchr(str, ':')) != NULL) {
1154 		*at++ = '\0';
1155 		*port = at;
1156 	} else
1157 		*port = def;
1158 
1159 	strtonum(*port, 1, UINT16_MAX, &errstr);
1160 	if (errstr != NULL)
1161 		yyerror("port is %s: %s", errstr, *port);
1162 }
1163 
1164 void
1165 only_once(const void *ptr, const char *name)
1166 {
1167 	if (ptr != NULL)
1168 		yyerror("`%s' specified more than once", name);
1169 }
1170 
1171 void
1172 only_oncei(int i, const char *name)
1173 {
1174 	if (i != -1)
1175 		yyerror("`%s' specified more than once", name);
1176 }
1177 
1178 int
1179 fastcgi_conf(char *path, char *port, char *prog)
1180 {
1181 	struct fcgi	*f;
1182 	int		i;
1183 
1184 	for (i = 0; i < FCGI_MAX; ++i) {
1185 		f = &fcgi[i];
1186 
1187 		if (f->path == NULL) {
1188 			f->id = i;
1189 			f->path = path;
1190 			f->port = port;
1191 			f->prog = prog;
1192 			return i;
1193 		}
1194 
1195 		/* XXX: what to do with prog? */
1196 		if (!strcmp(f->path, path) &&
1197 		    ((port == NULL && f->port == NULL) ||
1198 		     !strcmp(f->port, port))) {
1199 			free(path);
1200 			free(port);
1201 			return i;
1202 		}
1203 	}
1204 
1205 	yyerror("too much `fastcgi' rules defined.");
1206 	return -1;
1207 }
1208 
1209 void
1210 add_param(char *name, char *val, int env)
1211 {
1212 	struct envlist *e;
1213 	struct envhead *h;
1214 
1215 	if (env)
1216 		h = &host->env;
1217 	else
1218 		h = &host->params;
1219 
1220 	e = xcalloc(1, sizeof(*e));
1221 	e->name = name;
1222 	e->value = val;
1223 	if (TAILQ_EMPTY(h))
1224 		TAILQ_INSERT_HEAD(h, e, envs);
1225 	else
1226 		TAILQ_INSERT_TAIL(h, e, envs);
1227 }