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 			    "`types' block.");
222 			add_mime(&conf.mime, $2, $3);
223 		}
224 		| MAP string TOEXT string {
225 			yywarn("`map mime to-ext' is deprecated and will be "
226 			    "removed in a future version, please use the new "
227 			    "`types' block.");
228 			add_mime(&conf.mime, $2, $4);
229 		}
230 		| PORT NUM		{ conf.port = check_port_num($2); }
231 		| PREFORK NUM		{ conf.prefork = check_prefork_num($2); }
232 		| PROTOCOLS string {
233 			if (tls_config_parse_protocols(&conf.protos, $2) == -1)
234 				yyerror("invalid protocols string \"%s\"", $2);
235 			free($2);
236 		}
237 		| USER string		{ conf.user = $2; }
238 		;
239 
240 vhost		: SERVER string {
241 			host = new_vhost();
242 			TAILQ_INSERT_HEAD(&hosts, host, vhosts);
243 
244 			loc = new_location();
245 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
246 
247 			TAILQ_INIT(&host->proxies);
248 
249 			loc->match = xstrdup("*");
250 			host->domain = $2;
251 
252 			if (strstr($2, "xn--") != NULL) {
253 				yywarn("\"%s\" looks like punycode: you "
254 				    "should use the decoded hostname", $2);
255 			}
256 		} '{' optnl servbody '}' {
257 			if (host->cert == NULL || host->key == NULL)
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 			a->alias = $2;
274 			if (TAILQ_EMPTY(&host->aliases))
275 				TAILQ_INSERT_HEAD(&host->aliases, a, aliases);
276 			else
277 				TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
278 		}
279 		| CERT string		{
280 			only_once(host->cert, "cert");
281 			host->cert = ensure_absolute_path($2);
282 		}
283 		| CGI string		{
284 			only_once(host->cgi, "cgi");
285 			/* drop the starting '/', if any */
286 			if (*$2 == '/')
287 				memmove($2, $2+1, strlen($2));
288 			host->cgi = $2;
289 		}
290 		| ENTRYPOINT string {
291 			only_once(host->entrypoint, "entrypoint");
292 			while (*$2 == '/')
293 				memmove($2, $2+1, strlen($2));
294 			host->entrypoint = $2;
295 		}
296 		| ENV string '=' string {
297 			add_param($2, $4, 1);
298 		}
299 		| KEY string		{
300 			only_once(host->key, "key");
301 			host->key  = ensure_absolute_path($2);
302 		}
303 		| OCSP string		{
304 			only_once(host->ocsp, "ocsp");
305 			host->ocsp = ensure_absolute_path($2);
306 		}
307 		| PARAM string '=' string {
308 			add_param($2, $4, 0);
309 		}
310 		| locopt
311 		;
312 
313 proxy		: PROXY { advance_proxy(); }
314 		  proxy_matches '{' optnl proxy_opts '}' {
315 			if (proxy->host == NULL)
316 				yyerror("invalid proxy block: missing `relay-to' option");
317 
318 			if ((proxy->cert == NULL && proxy->key != NULL) ||
319 			    (proxy->cert != NULL && proxy->key == NULL))
320 				yyerror("invalid proxy block: missing cert or key");
321 		}
322 		;
323 
324 proxy_matches	: /* empty */
325 		| proxy_matches proxy_match
326 		;
327 
328 proxy_match	: PROTO string {
329 			only_once(proxy->match_proto, "proxy proto");
330 			free(proxy->match_proto);
331 			proxy->match_proto = $2;
332 		}
333 		| FOR_HOST string {
334 			only_once(proxy->match_host, "proxy for-host");
335 			free(proxy->match_host);
336 			parsehp($2, &proxy->match_host, &proxy->match_port, "10965");
337 		}
338 		;
339 
340 proxy_opts	: /* empty */
341 		| proxy_opts proxy_opt optnl
342 		;
343 
344 proxy_opt	: CERT string {
345 			only_once(proxy->cert, "proxy cert");
346 			tls_unload_file(proxy->cert, proxy->certlen);
347 			ensure_absolute_path($2);
348 			proxy->cert = tls_load_file($2, &proxy->certlen, NULL);
349 			if (proxy->cert == NULL)
350 				yyerror("can't load cert %s", $2);
351 			free($2);
352 		}
353 		| KEY string {
354 			only_once(proxy->key, "proxy key");
355 			tls_unload_file(proxy->key, proxy->keylen);
356 			ensure_absolute_path($2);
357 			proxy->key = tls_load_file($2, &proxy->keylen, NULL);
358 			if (proxy->key == NULL)
359 				yyerror("can't load key %s", $2);
360 			free($2);
361 		}
362 		| PROTOCOLS string {
363 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
364 				yyerror("invalid protocols string \"%s\"", $2);
365 			free($2);
366 		}
367 		| RELAY_TO string {
368 			only_once(proxy->host, "proxy relay-to");
369 			free(proxy->host);
370 			parsehp($2, &proxy->host, &proxy->port, "1965");
371 		}
372 		| REQUIRE CLIENT CA string {
373 			only_once(proxy->reqca, "require client ca");
374 			ensure_absolute_path($4);
375 			if ((proxy->reqca = load_ca($4)) == NULL)
376 				yyerror("couldn't load ca cert: %s", $4);
377 			free($4);
378 		}
379 		| SNI string {
380 			only_once(proxy->sni, "proxy sni");
381 			free(proxy->sni);
382 			proxy->sni = $2;
383 		}
384 		| USE_TLS bool {
385 			proxy->notls = !$2;
386 		}
387 		| VERIFYNAME bool {
388 			proxy->noverifyname = !$2;
389 		}
390 		;
391 
392 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
393 			/* drop the starting '/' if any */
394 			if (*$3 == '/')
395 				memmove($3, $3+1, strlen($3));
396 			loc->match = $3;
397 		}
398 		| error '}'
399 		;
400 
401 locopts		: /* empty */
402 		| locopts locopt optnl
403 		;
404 
405 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
406 		| BLOCK RETURN NUM string {
407 			only_once(loc->block_fmt, "block");
408 			loc->block_fmt = check_block_fmt($4);
409 			loc->block_code = check_block_code($3);
410 		}
411 		| BLOCK RETURN NUM {
412 			only_once(loc->block_fmt, "block");
413 			loc->block_fmt = xstrdup("temporary failure");
414 			loc->block_code = check_block_code($3);
415 			if ($3 >= 30 && $3 < 40)
416 				yyerror("missing `meta' for block return %d", $3);
417 		}
418 		| BLOCK {
419 			only_once(loc->block_fmt, "block");
420 			loc->block_fmt = xstrdup("temporary failure");
421 			loc->block_code = 40;
422 		}
423 		| DEFAULT TYPE string {
424 			only_once(loc->default_mime, "default type");
425 			loc->default_mime = $3;
426 		}
427 		| FASTCGI fastcgi
428 		| INDEX string {
429 			only_once(loc->index, "index");
430 			loc->index = $2;
431 		}
432 		| LANG string {
433 			only_once(loc->lang, "lang");
434 			loc->lang = $2;
435 		}
436 		| LOG bool	{ loc->disable_log = !$2; }
437 		| REQUIRE CLIENT CA string {
438 			only_once(loc->reqca, "require client ca");
439 			ensure_absolute_path($4);
440 			if ((loc->reqca = load_ca($4)) == NULL)
441 				yyerror("couldn't load ca cert: %s", $4);
442 			free($4);
443 		}
444 		| ROOT string		{
445 			only_once(loc->dir, "root");
446 			loc->dir  = ensure_absolute_path($2);
447 		}
448 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
449 		;
450 
451 fastcgi		: SPAWN string {
452 			only_oncei(loc->fcgi, "fastcgi");
453 			loc->fcgi = fastcgi_conf(NULL, NULL, $2);
454 		}
455 		| string {
456 			only_oncei(loc->fcgi, "fastcgi");
457 			loc->fcgi = fastcgi_conf($1, NULL, NULL);
458 		}
459 		| TCP string PORT NUM {
460 			char *c;
461 			if (asprintf(&c, "%d", $4) == -1)
462 				err(1, "asprintf");
463 			only_oncei(loc->fcgi, "fastcgi");
464 			loc->fcgi = fastcgi_conf($2, c, NULL);
465 		}
466 		| TCP string {
467 			only_oncei(loc->fcgi, "fastcgi");
468 			loc->fcgi = fastcgi_conf($2, xstrdup("9000"), NULL);
469 		}
470 		| TCP string PORT string {
471 			only_oncei(loc->fcgi, "fastcgi");
472 			loc->fcgi = fastcgi_conf($2, $4, NULL);
473 		}
474 		;
475 
476 types		: TYPES '{' optnl mediaopts_l '}'
477 		;
478 
479 mediaopts_l	: mediaopts_l mediaoptsl nl
480 		| mediaoptsl nl
481 		;
482 
483 mediaoptsl	: STRING { current_media = $1; } medianames_l optsemicolon
484 		| include
485 		;
486 
487 medianames_l	: medianames_l medianamesl
488 		| medianamesl
489 		;
490 
491 medianamesl	: numberstring { add_mime(&conf.mime, current_media, $1); }
492 		;
493 
494 nl		: '\n' optnl
495 		;
496 
497 optnl		: '\n' optnl		/* zero or more newlines */
498 		| ';' optnl		/* semicolons too */
499 		| /*empty*/
500 		;
501 
502 optsemicolon	: ';'
503 		|
504 		;
505 
506 %%
507 
508 static const struct keyword {
509 	const char *word;
510 	int token;
511 } keywords[] = {
512 	/* these MUST be sorted */
513 	{"alias", ALIAS},
514 	{"auto", AUTO},
515 	{"block", BLOCK},
516 	{"ca", CA},
517 	{"cert", CERT},
518 	{"cgi", CGI},
519 	{"chroot", CHROOT},
520 	{"client", CLIENT},
521 	{"default", DEFAULT},
522 	{"entrypoint", ENTRYPOINT},
523 	{"env", ENV},
524 	{"fastcgi", FASTCGI},
525 	{"for-host", FOR_HOST},
526 	{"include", INCLUDE},
527 	{"index", INDEX},
528 	{"ipv6", IPV6},
529 	{"key", KEY},
530 	{"lang", LANG},
531 	{"location", LOCATION},
532 	{"log", LOG},
533 	{"map", MAP},
534 	{"mime", MIME},
535 	{"ocsp", OCSP},
536 	{"off", OFF},
537 	{"on", ON},
538 	{"param", PARAM},
539 	{"port", PORT},
540 	{"prefork", PREFORK},
541 	{"proto", PROTO},
542 	{"protocols", PROTOCOLS},
543 	{"proxy", PROXY},
544 	{"relay-to", RELAY_TO},
545 	{"require", REQUIRE},
546 	{"return", RETURN},
547 	{"root", ROOT},
548 	{"server", SERVER},
549 	{"sni", SNI},
550 	{"spawn", SPAWN},
551 	{"strip", STRIP},
552 	{"tcp", TCP},
553 	{"to-ext", TOEXT},
554 	{"type", TYPE},
555 	{"types", TYPES},
556 	{"use-tls", USE_TLS},
557 	{"user", USER},
558 	{"verifyname", VERIFYNAME},
559 };
560 
561 void
562 yyerror(const char *msg, ...)
563 {
564 	va_list ap;
565 
566 	file->errors++;
567 
568 	va_start(ap, msg);
569 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
570 	vfprintf(stderr, msg, ap);
571 	fprintf(stderr, "\n");
572 	va_end(ap);
573 }
574 
575 void
576 yywarn(const char *msg, ...)
577 {
578 	va_list ap;
579 
580 	va_start(ap, msg);
581 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
582 	vfprintf(stderr, msg, ap);
583 	fprintf(stderr, "\n");
584 	va_end(ap);
585 }
586 
587 int
588 kw_cmp(const void *k, const void *e)
589 {
590 	return strcmp(k, ((struct keyword *)e)->word);
591 }
592 
593 int
594 lookup(char *s)
595 {
596 	const struct keyword	*p;
597 
598 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
599 	    sizeof(keywords[0]), kw_cmp);
600 
601 	if (p)
602 		return p->token;
603 	else
604 		return STRING;
605 }
606 
607 #define START_EXPAND	1
608 #define DONE_EXPAND	2
609 
610 static int	expanding;
611 
612 int
613 igetc(void)
614 {
615 	int	c;
616 
617 	while (1) {
618 		if (file->ungetpos > 0)
619 			c = file->ungetbuf[--file->ungetpos];
620 		else
621 			c = getc(file->stream);
622 
623 		if (c == START_EXPAND)
624 			expanding = 1;
625 		else if (c == DONE_EXPAND)
626 			expanding = 0;
627 		else
628 			break;
629 	}
630 	return c;
631 }
632 
633 int
634 lgetc(int quotec)
635 {
636 	int		c, next;
637 
638 	if (quotec) {
639 		if ((c = igetc()) == EOF) {
640 			yyerror("reached end of file while parsing "
641 			    "quoted string");
642 			if (file == topfile || popfile() == EOF)
643 				return EOF;
644 			return quotec;
645 		}
646 		return c;
647 	}
648 
649 	while ((c = igetc()) == '\\') {
650 		next = igetc();
651 		if (next != '\n') {
652 			c = next;
653 			break;
654 		}
655 		yylval.lineno = file->lineno;
656 		file->lineno++;
657 	}
658 
659 	if (c == EOF) {
660 		/*
661 		 * Fake EOL when hit EOF for the first time. This gets line
662 		 * count right if last line in included file is syntactically
663 		 * invalid and has no newline.
664 		 */
665 		if (file->eof_reached == 0) {
666 			file->eof_reached = 1;
667 			return '\n';
668 		}
669 		while (c == EOF) {
670 			if (file == topfile || popfile() == EOF)
671 				return EOF;
672 			c = igetc();
673 		}
674 	}
675 	return c;
676 }
677 
678 void
679 lungetc(int c)
680 {
681 	if (c == EOF)
682 		return;
683 
684 	if (file->ungetpos >= file->ungetsize) {
685 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
686 		if (p == NULL)
687 			err(1, "lungetc");
688 		file->ungetbuf = p;
689 		file->ungetsize *= 2;
690 	}
691 	file->ungetbuf[file->ungetpos++] = c;
692 }
693 
694 int
695 findeol(void)
696 {
697 	int	c;
698 
699 	/* Skip to either EOF or the first real EOL. */
700 	while (1) {
701 		c = lgetc(0);
702 		if (c == '\n') {
703 			file->lineno++;
704 			break;
705 		}
706 		if (c == EOF)
707 			break;
708 	}
709 	return ERROR;
710 }
711 
712 int
713 yylex(void)
714 {
715 	char	 buf[8096];
716 	char	*p, *val;
717 	int	 quotec, next, c;
718 	int	 token;
719 
720 top:
721 	p = buf;
722 	while ((c = lgetc(0)) == ' ' || c == '\t')
723 		; /* nothing */
724 
725 	yylval.lineno = file->lineno;
726 	if (c == '#')
727 		while ((c = lgetc(0)) != '\n' && c != EOF)
728 			; /* nothing */
729 	if (c == '$' && !expanding) {
730 		while (1) {
731 			if ((c = lgetc(0)) == EOF)
732 				return 0;
733 			if (p + 1 >= buf + sizeof(buf) -1) {
734 				yyerror("string too long");
735 				return findeol();
736 			}
737 			if (isalnum(c) || c == '_') {
738 				*p++ = c;
739 				continue;
740 			}
741 			*p = '\0';
742 			lungetc(c);
743 			break;
744 		}
745 		val = symget(buf);
746 		if (val == NULL) {
747 			yyerror("macro `%s' not defined", buf);
748 			return findeol();
749 		}
750 		yylval.v.string = xstrdup(val);
751 		return STRING;
752 	}
753 	if (c == '@' && !expanding) {
754 		while (1) {
755 			if ((c = lgetc(0)) == EOF)
756 				return 0;
757 
758 			if (p + 1 >= buf + sizeof(buf) - 1) {
759 				yyerror("string too long");
760 				return findeol();
761 			}
762 			if (isalnum(c) || c == '_') {
763 				*p++ = c;
764 				continue;
765 			}
766 			*p = '\0';
767 			lungetc(c);
768 			break;
769 		}
770 		val = symget(buf);
771 		if (val == NULL) {
772 			yyerror("macro '%s' not defined", buf);
773 			return findeol();
774 		}
775 		p = val + strlen(val) - 1;
776 		lungetc(DONE_EXPAND);
777 		while (p >= val) {
778 			lungetc(*p);
779 			p--;
780 		}
781 		lungetc(START_EXPAND);
782 		goto top;
783 	}
784 
785 	switch (c) {
786 	case '\'':
787 	case '"':
788 		quotec = c;
789 		while (1) {
790 			if ((c = lgetc(quotec)) == EOF)
791 				return 0;
792 			if (c == '\n') {
793 				file->lineno++;
794 				continue;
795 			} else if (c == '\\') {
796 				if ((next = lgetc(quotec)) == EOF)
797 					return (0);
798 				if (next == quotec || next == ' ' ||
799 				    next == '\t')
800 					c = next;
801 				else if (next == '\n') {
802 					file->lineno++;
803 					continue;
804 				} else
805 					lungetc(next);
806 			} else if (c == quotec) {
807 				*p = '\0';
808 				break;
809 			} else if (c == '\0') {
810 				yyerror("invalid syntax");
811 				return findeol();
812 			}
813 			if (p + 1 >= buf + sizeof(buf) - 1) {
814 				yyerror("string too long");
815 				return findeol();
816 			}
817 			*p++ = c;
818 		}
819 		yylval.v.string = strdup(buf);
820 		if (yylval.v.string == NULL)
821 			err(1, "yylex: strdup");
822 		return STRING;
823 	}
824 
825 #define allowed_to_end_number(x) \
826 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
827 
828 	if (c == '-' || isdigit(c)) {
829 		do {
830 			*p++ = c;
831 			if ((size_t)(p-buf) >= sizeof(buf)) {
832 				yyerror("string too long");
833 				return findeol();
834 			}
835 		} while ((c = lgetc(0)) != EOF && isdigit(c));
836 		lungetc(c);
837 		if (p == buf + 1 && buf[0] == '-')
838 			goto nodigits;
839 		if (c == EOF || allowed_to_end_number(c)) {
840 			const char *errstr = NULL;
841 
842 			*p = '\0';
843 			yylval.v.number = strtonum(buf, LLONG_MIN,
844 			    LLONG_MAX, &errstr);
845 			if (errstr) {
846 				yyerror("\"%s\" invalid number: %s",
847 				    buf, errstr);
848 				return findeol();
849 			}
850 			return NUM;
851 		} else {
852 nodigits:
853 			while (p > buf + 1)
854 				lungetc(*--p);
855 			c = *--p;
856 			if (c == '-')
857 				return c;
858 		}
859 	}
860 
861 #define allowed_in_string(x) \
862 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
863 	x != '{' && x != '}' && \
864 	x != '!' && x != '=' && x != '#' && \
865 	x != ',' && x != ';'))
866 
867 	if (isalnum(c) || c == ':' || c == '_') {
868 		do {
869 			*p++ = c;
870 			if ((size_t)(p-buf) >= sizeof(buf)) {
871 				yyerror("string too long");
872 				return findeol();
873 			}
874 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
875 		lungetc(c);
876 		*p = '\0';
877 		if ((token = lookup(buf)) == STRING)
878 			yylval.v.string = xstrdup(buf);
879 		return token;
880 	}
881 	if (c == '\n') {
882 		yylval.lineno = file->lineno;
883 		file->lineno++;
884 	}
885 	if (c == EOF)
886 		return 0;
887 	return c;
888 }
889 
890 struct file *
891 pushfile(const char *name, int secret)
892 {
893 	struct file	*nfile;
894 
895 	nfile = xcalloc(1, sizeof(*nfile));
896 	nfile->name = xstrdup(name);
897 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
898 		log_warn(NULL, "can't open %s: %s", nfile->name,
899 		    strerror(errno));
900 		free(nfile->name);
901 		free(nfile);
902 		return NULL;
903 	}
904 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
905 	nfile->ungetsize = 16;
906 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
907 	TAILQ_INSERT_TAIL(&files, nfile, entry);
908 	return nfile;
909 }
910 
911 int
912 popfile(void)
913 {
914 	struct file	*prev;
915 
916 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
917 		prev->errors += file->errors;
918 
919 	TAILQ_REMOVE(&files, file, entry);
920 	fclose(file->stream);
921 	free(file->name);
922 	free(file->ungetbuf);
923 	free(file);
924 	file = prev;
925 	return file ? 0 : EOF;
926 }
927 
928 void
929 parse_conf(const char *filename)
930 {
931 	struct sym		*sym, *next;
932 
933 	file = pushfile(filename, 0);
934 	if (file == NULL)
935 		exit(1);
936 	topfile = file;
937 
938 	yyparse();
939 	errors = file->errors;
940 	popfile();
941 
942 	/* Free macros and check which have not been used. */
943 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
944 		/* TODO: warn if !sym->used */
945 		if (!sym->persist) {
946 			free(sym->name);
947 			free(sym->val);
948 			TAILQ_REMOVE(&symhead, sym, entry);
949 			free(sym);
950 		}
951 	}
952 
953 	if (errors)
954 		exit(1);
955 }
956 
957 void
958 print_conf(void)
959 {
960 	struct vhost	*h;
961 	/* struct location	*l; */
962 	/* struct envlist	*e; */
963 	/* struct alist	*a; */
964 
965 	if (conf.chroot != NULL)
966 		printf("chroot \"%s\"\n", conf.chroot);
967 	printf("ipv6 %s\n", conf.ipv6 ? "on" : "off");
968 	/* XXX: defined mimes? */
969 	printf("port %d\n", conf.port);
970 	printf("prefork %d\n", conf.prefork);
971 	/* XXX: protocols? */
972 	if (conf.user != NULL)
973 		printf("user \"%s\"\n", conf.user);
974 
975 	TAILQ_FOREACH(h, &hosts, vhosts) {
976 		printf("\nserver \"%s\" {\n", h->domain);
977 		printf("	cert \"%s\"\n", h->cert);
978 		printf("	key \"%s\"\n", h->key);
979 		/* TODO: print locations... */
980 		printf("}\n");
981 	}
982 }
983 
984 int
985 symset(const char *name, const char *val, int persist)
986 {
987 	struct sym *sym;
988 
989 	TAILQ_FOREACH(sym, &symhead, entry) {
990 		if (!strcmp(name, sym->name))
991 			break;
992 	}
993 
994 	if (sym != NULL) {
995 		if (sym->persist)
996 			return 0;
997 		else {
998 			free(sym->name);
999 			free(sym->val);
1000 			TAILQ_REMOVE(&symhead, sym, entry);
1001 			free(sym);
1002 		}
1003 	}
1004 
1005 	sym = xcalloc(1, sizeof(*sym));
1006 	sym->name = xstrdup(name);
1007 	sym->val = xstrdup(val);
1008 	sym->used = 0;
1009 	sym->persist = persist;
1010 
1011 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1012 	return 0;
1013 }
1014 
1015 int
1016 cmdline_symset(char *s)
1017 {
1018 	char	*sym, *val;
1019 	int	 ret;
1020 
1021 	if ((val = strrchr(s, '=')) == NULL)
1022 		return -1;
1023 	sym = xcalloc(1, val - s + 1);
1024 	memcpy(sym, s, val - s);
1025 	ret = symset(sym, val + 1, 1);
1026 	free(sym);
1027 	return ret;
1028 }
1029 
1030 char *
1031 symget(const char *nam)
1032 {
1033 	struct sym	*sym;
1034 
1035 	TAILQ_FOREACH(sym, &symhead, entry) {
1036 		if (strcmp(nam, sym->name) == 0) {
1037 			sym->used = 1;
1038 			return sym->val;
1039 		}
1040 	}
1041 	return NULL;
1042 }
1043 
1044 struct vhost *
1045 new_vhost(void)
1046 {
1047 	return xcalloc(1, sizeof(struct vhost));
1048 }
1049 
1050 struct location *
1051 new_location(void)
1052 {
1053 	struct location *l;
1054 
1055 	l = xcalloc(1, sizeof(*l));
1056 	l->dirfd = -1;
1057 	l->fcgi = -1;
1058 	return l;
1059 }
1060 
1061 struct proxy *
1062 new_proxy(void)
1063 {
1064 	struct proxy *p;
1065 
1066 	p = xcalloc(1, sizeof(*p));
1067 	p->protocols = TLS_PROTOCOLS_DEFAULT;
1068 	return p;
1069 }
1070 
1071 char *
1072 ensure_absolute_path(char *path)
1073 {
1074 	if (path == NULL || *path != '/')
1075 		yyerror("not an absolute path: %s", path);
1076 	return path;
1077 }
1078 
1079 int
1080 check_block_code(int n)
1081 {
1082 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1083 		yyerror("invalid block code %d", n);
1084 	return n;
1085 }
1086 
1087 char *
1088 check_block_fmt(char *fmt)
1089 {
1090 	char *s;
1091 
1092 	for (s = fmt; *s; ++s) {
1093 		if (*s != '%')
1094 			continue;
1095 		switch (*++s) {
1096 		case '%':
1097 		case 'p':
1098 		case 'q':
1099 		case 'P':
1100 		case 'N':
1101 			break;
1102 		default:
1103 			yyerror("invalid format specifier %%%c", *s);
1104 		}
1105 	}
1106 
1107 	return fmt;
1108 }
1109 
1110 int
1111 check_strip_no(int n)
1112 {
1113 	if (n <= 0)
1114 		yyerror("invalid strip number %d", n);
1115 	return n;
1116 }
1117 
1118 int
1119 check_port_num(int n)
1120 {
1121 	if (n <= 0 || n >= UINT16_MAX)
1122 		yyerror("port number is %s: %d",
1123 		    n <= 0 ? "too small" : "too large",
1124 		    n);
1125 	return n;
1126 }
1127 
1128 int
1129 check_prefork_num(int n)
1130 {
1131 	if (n <= 0 || n >= PROC_MAX)
1132 		yyerror("invalid prefork number %d", n);
1133 	return n;
1134 }
1135 
1136 void
1137 advance_loc(void)
1138 {
1139 	loc = new_location();
1140 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1141 }
1142 
1143 void
1144 advance_proxy(void)
1145 {
1146 	proxy = new_proxy();
1147 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1148 }
1149 
1150 void
1151 parsehp(char *str, char **host, const char **port, const char *def)
1152 {
1153 	char		*at;
1154 	const char	*errstr;
1155 
1156 	*host = str;
1157 
1158 	if ((at = strchr(str, ':')) != NULL) {
1159 		*at++ = '\0';
1160 		*port = at;
1161 	} else
1162 		*port = def;
1163 
1164 	strtonum(*port, 1, UINT16_MAX, &errstr);
1165 	if (errstr != NULL)
1166 		yyerror("port is %s: %s", errstr, *port);
1167 }
1168 
1169 void
1170 only_once(const void *ptr, const char *name)
1171 {
1172 	if (ptr != NULL)
1173 		yyerror("`%s' specified more than once", name);
1174 }
1175 
1176 void
1177 only_oncei(int i, const char *name)
1178 {
1179 	if (i != -1)
1180 		yyerror("`%s' specified more than once", name);
1181 }
1182 
1183 int
1184 fastcgi_conf(char *path, char *port, char *prog)
1185 {
1186 	struct fcgi	*f;
1187 	int		i;
1188 
1189 	for (i = 0; i < FCGI_MAX; ++i) {
1190 		f = &fcgi[i];
1191 
1192 		if (f->path == NULL) {
1193 			f->id = i;
1194 			f->path = path;
1195 			f->port = port;
1196 			f->prog = prog;
1197 			return i;
1198 		}
1199 
1200 		/* XXX: what to do with prog? */
1201 		if (!strcmp(f->path, path) &&
1202 		    ((port == NULL && f->port == NULL) ||
1203 		     !strcmp(f->port, port))) {
1204 			free(path);
1205 			free(port);
1206 			return i;
1207 		}
1208 	}
1209 
1210 	yyerror("too much `fastcgi' rules defined.");
1211 	return -1;
1212 }
1213 
1214 void
1215 add_param(char *name, char *val, int env)
1216 {
1217 	struct envlist *e;
1218 	struct envhead *h;
1219 
1220 	if (env)
1221 		h = &host->env;
1222 	else
1223 		h = &host->params;
1224 
1225 	e = xcalloc(1, sizeof(*e));
1226 	e->name = name;
1227 	e->value = val;
1228 	if (TAILQ_EMPTY(h))
1229 		TAILQ_INSERT_HEAD(h, e, envs);
1230 	else
1231 		TAILQ_INSERT_TAIL(h, e, envs);
1232 }