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 <ctype.h>
27 #include <errno.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 
33 #include "gmid.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 int			 errors;
103 
104 typedef struct {
105 	union {
106 		char	*string;
107 		int	 number;
108 	} v;
109 	int lineno;
110 } YYSTYPE;
111 
112 %}
113 
114 /* for bison: */
115 /* %define parse.error verbose */
116 
117 %token	ALIAS AUTO
118 %token	BLOCK
119 %token	CA CERT CGI CHROOT CLIENT
120 %token	DEFAULT
121 %token	ENTRYPOINT ENV
122 %token	FASTCGI FOR_HOST
123 %token	INCLUDE INDEX IPV6
124 %token	KEY
125 %token	LANG LOCATION LOG
126 %token	MAP MIME
127 %token	OCSP OFF ON
128 %token	PARAM PORT PREFORK PROTO PROTOCOLS PROXY
129 %token	RELAY_TO REQUIRE RETURN ROOT
130 %token	SERVER SPAWN STRIP
131 %token	TCP TOEXT TYPE
132 %token	USE_TLS USER
133 %token	VERIFYNAME
134 
135 %token	ERROR
136 
137 %token	<v.string>	STRING
138 %token	<v.number>	NUM
139 
140 %type	<v.number>	bool
141 %type	<v.string>	string
142 
143 %%
144 
145 conf		: /* empty */
146 		| conf include '\n'
147 		| conf '\n'
148 		| conf varset '\n'
149 		| conf option '\n'
150 		| conf vhost '\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 varset		: STRING '=' string		{
187 			char *s = $1;
188 			while (*s++) {
189 				if (isspace((unsigned char)*s)) {
190 					yyerror("macro name cannot contain "
191 					    "whitespaces");
192 					free($1);
193 					free($3);
194 					YYERROR;
195 				}
196 			}
197 			symset($1, $3, 0);
198 			free($1);
199 			free($3);
200 		}
201 		;
202 
203 option		: CHROOT string	{ conf.chroot = $2; }
204 		| IPV6 bool		{ conf.ipv6 = $2; }
205 		| MIME STRING string	{
206 			yywarn("`mime MIME EXT' is deprecated and will be "
207 			    "removed in a future version, please use the new "
208 			    "syntax: `map MIME to-ext EXT'");
209 			add_mime(&conf.mime, $2, $3);
210 		}
211 		| MAP string TOEXT string { add_mime(&conf.mime, $2, $4); }
212 		| PORT NUM		{ conf.port = check_port_num($2); }
213 		| PREFORK NUM		{ conf.prefork = check_prefork_num($2); }
214 		| PROTOCOLS string {
215 			if (tls_config_parse_protocols(&conf.protos, $2) == -1)
216 				yyerror("invalid protocols string \"%s\"", $2);
217 			free($2);
218 		}
219 		| USER string		{ conf.user = $2; }
220 		;
221 
222 vhost		: SERVER string {
223 			host = new_vhost();
224 			TAILQ_INSERT_HEAD(&hosts, host, vhosts);
225 
226 			loc = new_location();
227 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
228 
229 			TAILQ_INIT(&host->proxies);
230 
231 			loc->match = xstrdup("*");
232 			host->domain = $2;
233 
234 			if (strstr($2, "xn--") != NULL) {
235 				yywarn("\"%s\" looks like punycode: you "
236 				    "should use the decoded hostname", $2);
237 			}
238 		} '{' optnl servbody '}' {
239 			if (host->cert == NULL || host->key == NULL)
240 				yyerror("invalid vhost definition: %s", $2);
241 		}
242 		| error '}'		{ yyerror("bad server directive"); }
243 		;
244 
245 servbody	: /* empty */
246 		| servbody servopt optnl
247 		| servbody location optnl
248 		| servbody proxy optnl
249 		;
250 
251 servopt		: ALIAS string {
252 			struct alist *a;
253 
254 			a = xcalloc(1, sizeof(*a));
255 			a->alias = $2;
256 			if (TAILQ_EMPTY(&host->aliases))
257 				TAILQ_INSERT_HEAD(&host->aliases, a, aliases);
258 			else
259 				TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
260 		}
261 		| CERT string		{
262 			only_once(host->cert, "cert");
263 			host->cert = ensure_absolute_path($2);
264 		}
265 		| CGI string		{
266 			only_once(host->cgi, "cgi");
267 			/* drop the starting '/', if any */
268 			if (*$2 == '/')
269 				memmove($2, $2+1, strlen($2));
270 			host->cgi = $2;
271 		}
272 		| ENTRYPOINT string {
273 			only_once(host->entrypoint, "entrypoint");
274 			while (*$2 == '/')
275 				memmove($2, $2+1, strlen($2));
276 			host->entrypoint = $2;
277 		}
278 		| ENV string '=' string {
279 			add_param($2, $4, 1);
280 		}
281 		| KEY string		{
282 			only_once(host->key, "key");
283 			host->key  = ensure_absolute_path($2);
284 		}
285 		| OCSP string		{
286 			only_once(host->ocsp, "ocsp");
287 			host->ocsp = ensure_absolute_path($2);
288 		}
289 		| PARAM string '=' string {
290 			add_param($2, $4, 0);
291 		}
292 		| locopt
293 		;
294 
295 proxy		: PROXY { advance_proxy(); }
296 		  proxy_matches '{' optnl proxy_opts '}' {
297 			if (proxy->host == NULL)
298 				yyerror("invalid proxy block: missing `relay-to' option");
299 
300 			if ((proxy->cert == NULL && proxy->key != NULL) ||
301 			    (proxy->cert != NULL && proxy->key == NULL))
302 				yyerror("invalid proxy block: missing cert or key");
303 		}
304 		;
305 
306 proxy_matches	: /* empty */
307 		| proxy_matches proxy_match
308 		;
309 
310 proxy_match	: PROTO string {
311 			only_once(proxy->match_proto, "proxy proto");
312 			free(proxy->match_proto);
313 			proxy->match_proto = $2;
314 		}
315 		| FOR_HOST string {
316 			only_once(proxy->match_host, "proxy for-host");
317 			free(proxy->match_host);
318 			parsehp($2, &proxy->match_host, &proxy->match_port, "10965");
319 		}
320 		;
321 
322 proxy_opts	: /* empty */
323 		| proxy_opts proxy_opt optnl
324 		;
325 
326 proxy_opt	: CERT string {
327 			only_once(proxy->cert, "proxy cert");
328 			tls_unload_file(proxy->cert, proxy->certlen);
329 			ensure_absolute_path($2);
330 			proxy->cert = tls_load_file($2, &proxy->certlen, NULL);
331 			if (proxy->cert == NULL)
332 				yyerror("can't load cert %s", $2);
333 			free($2);
334 		}
335 		| KEY string {
336 			only_once(proxy->key, "proxy key");
337 			tls_unload_file(proxy->key, proxy->keylen);
338 			ensure_absolute_path($2);
339 			proxy->key = tls_load_file($2, &proxy->keylen, NULL);
340 			if (proxy->key == NULL)
341 				yyerror("can't load key %s", $2);
342 			free($2);
343 		}
344 		| PROTOCOLS string {
345 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
346 				yyerror("invalid protocols string \"%s\"", $2);
347 			free($2);
348 		}
349 		| RELAY_TO string {
350 			only_once(proxy->host, "proxy relay-to");
351 			free(proxy->host);
352 			parsehp($2, &proxy->host, &proxy->port, "1965");
353 		}
354 		| REQUIRE CLIENT CA string {
355 			only_once(proxy->reqca, "require client ca");
356 			ensure_absolute_path($4);
357 			if ((proxy->reqca = load_ca($4)) == NULL)
358 				yyerror("couldn't load ca cert: %s", $4);
359 			free($4);
360 		}
361 		| USE_TLS bool {
362 			proxy->notls = !$2;
363 		}
364 		| VERIFYNAME bool {
365 			proxy->noverifyname = !$2;
366 		}
367 		;
368 
369 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
370 			/* drop the starting '/' if any */
371 			if (*$3 == '/')
372 				memmove($3, $3+1, strlen($3));
373 			loc->match = $3;
374 		}
375 		| error '}'
376 		;
377 
378 locopts		: /* empty */
379 		| locopts locopt optnl
380 		;
381 
382 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
383 		| BLOCK RETURN NUM string {
384 			only_once(loc->block_fmt, "block");
385 			loc->block_fmt = check_block_fmt($4);
386 			loc->block_code = check_block_code($3);
387 		}
388 		| BLOCK RETURN NUM {
389 			only_once(loc->block_fmt, "block");
390 			loc->block_fmt = xstrdup("temporary failure");
391 			loc->block_code = check_block_code($3);
392 			if ($3 >= 30 && $3 < 40)
393 				yyerror("missing `meta' for block return %d", $3);
394 		}
395 		| BLOCK {
396 			only_once(loc->block_fmt, "block");
397 			loc->block_fmt = xstrdup("temporary failure");
398 			loc->block_code = 40;
399 		}
400 		| DEFAULT TYPE string {
401 			only_once(loc->default_mime, "default type");
402 			loc->default_mime = $3;
403 		}
404 		| FASTCGI fastcgi
405 		| INDEX string {
406 			only_once(loc->index, "index");
407 			loc->index = $2;
408 		}
409 		| LANG string {
410 			only_once(loc->lang, "lang");
411 			loc->lang = $2;
412 		}
413 		| LOG bool	{ loc->disable_log = !$2; }
414 		| REQUIRE CLIENT CA string {
415 			only_once(loc->reqca, "require client ca");
416 			ensure_absolute_path($4);
417 			if ((loc->reqca = load_ca($4)) == NULL)
418 				yyerror("couldn't load ca cert: %s", $4);
419 			free($4);
420 		}
421 		| ROOT string		{
422 			only_once(loc->dir, "root");
423 			loc->dir  = ensure_absolute_path($2);
424 		}
425 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
426 		;
427 
428 fastcgi		: SPAWN string {
429 			only_oncei(loc->fcgi, "fastcgi");
430 			loc->fcgi = fastcgi_conf(NULL, NULL, $2);
431 		}
432 		| string {
433 			only_oncei(loc->fcgi, "fastcgi");
434 			loc->fcgi = fastcgi_conf($1, NULL, NULL);
435 		}
436 		| TCP string PORT NUM {
437 			char *c;
438 			if (asprintf(&c, "%d", $4) == -1)
439 				err(1, "asprintf");
440 			only_oncei(loc->fcgi, "fastcgi");
441 			loc->fcgi = fastcgi_conf($2, c, NULL);
442 		}
443 		| TCP string {
444 			only_oncei(loc->fcgi, "fastcgi");
445 			loc->fcgi = fastcgi_conf($2, xstrdup("9000"), NULL);
446 		}
447 		| TCP string PORT string {
448 			only_oncei(loc->fcgi, "fastcgi");
449 			loc->fcgi = fastcgi_conf($2, $4, NULL);
450 		}
451 		;
452 
453 optnl		: '\n' optnl		/* zero or more newlines */
454 		| ';' optnl		/* semicolons too */
455 		| /*empty*/
456 		;
457 
458 %%
459 
460 static struct keyword {
461 	const char *word;
462 	int token;
463 } keywords[] = {
464 	/* these MUST be sorted */
465 	{"alias", ALIAS},
466 	{"auto", AUTO},
467 	{"block", BLOCK},
468 	{"ca", CA},
469 	{"cert", CERT},
470 	{"cgi", CGI},
471 	{"chroot", CHROOT},
472 	{"client", CLIENT},
473 	{"default", DEFAULT},
474 	{"entrypoint", ENTRYPOINT},
475 	{"env", ENV},
476 	{"fastcgi", FASTCGI},
477 	{"for-host", FOR_HOST},
478 	{"index", INDEX},
479 	{"ipv6", IPV6},
480 	{"key", KEY},
481 	{"lang", LANG},
482 	{"location", LOCATION},
483 	{"log", LOG},
484 	{"map", MAP},
485 	{"mime", MIME},
486 	{"ocsp", OCSP},
487 	{"off", OFF},
488 	{"on", ON},
489 	{"param", PARAM},
490 	{"port", PORT},
491 	{"prefork", PREFORK},
492 	{"proto", PROTO},
493 	{"protocols", PROTOCOLS},
494 	{"proxy", PROXY},
495 	{"relay-to", RELAY_TO},
496 	{"require", REQUIRE},
497 	{"return", RETURN},
498 	{"root", ROOT},
499 	{"server", SERVER},
500 	{"spawn", SPAWN},
501 	{"strip", STRIP},
502 	{"tcp", TCP},
503 	{"to-ext", TOEXT},
504 	{"type", TYPE},
505 	{"use-tls", USE_TLS},
506 	{"user", USER},
507 	{"verifyname", VERIFYNAME},
508 };
509 
510 void
511 yyerror(const char *msg, ...)
512 {
513 	va_list ap;
514 
515 	file->errors++;
516 
517 	va_start(ap, msg);
518 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
519 	vfprintf(stderr, msg, ap);
520 	fprintf(stderr, "\n");
521 	va_end(ap);
522 }
523 
524 void
525 yywarn(const char *msg, ...)
526 {
527 	va_list ap;
528 
529 	va_start(ap, msg);
530 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
531 	vfprintf(stderr, msg, ap);
532 	fprintf(stderr, "\n");
533 	va_end(ap);
534 }
535 
536 int
537 kw_cmp(const void *k, const void *e)
538 {
539 	return strcmp(k, ((struct keyword *)e)->word);
540 }
541 
542 int
543 lookup(char *s)
544 {
545 	const struct keyword	*p;
546 
547 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
548 	    sizeof(keywords[0]), kw_cmp);
549 
550 	if (p)
551 		return p->token;
552 	else
553 		return STRING;
554 }
555 
556 #define START_EXPAND	1
557 #define DONE_EXPAND	2
558 
559 static int	expanding;
560 
561 int
562 igetc(void)
563 {
564 	int	c;
565 
566 	while (1) {
567 		if (file->ungetpos > 0)
568 			c = file->ungetbuf[--file->ungetpos];
569 		else
570 			c = getc(file->stream);
571 
572 		if (c == START_EXPAND)
573 			expanding = 1;
574 		else if (c == DONE_EXPAND)
575 			expanding = 0;
576 		else
577 			break;
578 	}
579 	return c;
580 }
581 
582 int
583 lgetc(int quotec)
584 {
585 	int		c, next;
586 
587 	if (quotec) {
588 		if ((c = igetc()) == EOF) {
589 			yyerror("reached end of file while parsing "
590 			    "quoted string");
591 			if (file == topfile || popfile() == EOF)
592 				return EOF;
593 			return quotec;
594 		}
595 		return c;
596 	}
597 
598 	while ((c = igetc()) == '\\') {
599 		next = igetc();
600 		if (next != '\n') {
601 			c = next;
602 			break;
603 		}
604 		yylval.lineno = file->lineno;
605 		file->lineno++;
606 	}
607 
608 	if (c == EOF) {
609 		/*
610 		 * Fake EOL when hit EOF for the first time. This gets line
611 		 * count right if last line in included file is syntactically
612 		 * invalid and has no newline.
613 		 */
614 		if (file->eof_reached == 0) {
615 			file->eof_reached = 1;
616 			return '\n';
617 		}
618 		while (c == EOF) {
619 			if (file == topfile || popfile() == EOF)
620 				return EOF;
621 			c = igetc();
622 		}
623 	}
624 	return c;
625 }
626 
627 void
628 lungetc(int c)
629 {
630 	if (c == EOF)
631 		return;
632 
633 	if (file->ungetpos >= file->ungetsize) {
634 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
635 		if (p == NULL)
636 			err(1, "lungetc");
637 		file->ungetbuf = p;
638 		file->ungetsize *= 2;
639 	}
640 	file->ungetbuf[file->ungetpos++] = c;
641 }
642 
643 int
644 findeol(void)
645 {
646 	int	c;
647 
648 	/* Skip to either EOF or the first real EOL. */
649 	while (1) {
650 		c = lgetc(0);
651 		if (c == '\n') {
652 			file->lineno++;
653 			break;
654 		}
655 		if (c == EOF)
656 			break;
657 	}
658 	return ERROR;
659 }
660 
661 int
662 yylex(void)
663 {
664 	char	 buf[8096];
665 	char	*p, *val;
666 	int	 quotec, next, c;
667 	int	 token;
668 
669 top:
670 	p = buf;
671 	while ((c = lgetc(0)) == ' ' || c == '\t')
672 		; /* nothing */
673 
674 	yylval.lineno = file->lineno;
675 	if (c == '#')
676 		while ((c = lgetc(0)) != '\n' && c != EOF)
677 			; /* nothing */
678 	if (c == '$' && !expanding) {
679 		while (1) {
680 			if ((c = lgetc(0)) == EOF)
681 				return 0;
682 			if (p + 1 >= buf + sizeof(buf) -1) {
683 				yyerror("string too long");
684 				return findeol();
685 			}
686 			if (isalnum(c) || c == '_') {
687 				*p++ = c;
688 				continue;
689 			}
690 			*p = '\0';
691 			lungetc(c);
692 			break;
693 		}
694 		val = symget(buf);
695 		if (val == NULL) {
696 			yyerror("macro `%s' not defined", buf);
697 			return findeol();
698 		}
699 		yylval.v.string = xstrdup(val);
700 		return STRING;
701 	}
702 	if (c == '@' && !expanding) {
703 		while (1) {
704 			if ((c = lgetc(0)) == EOF)
705 				return 0;
706 
707 			if (p + 1 >= buf + sizeof(buf) - 1) {
708 				yyerror("string too long");
709 				return findeol();
710 			}
711 			if (isalnum(c) || c == '_') {
712 				*p++ = c;
713 				continue;
714 			}
715 			*p = '\0';
716 			lungetc(c);
717 			break;
718 		}
719 		val = symget(buf);
720 		if (val == NULL) {
721 			yyerror("macro '%s' not defined", buf);
722 			return findeol();
723 		}
724 		p = val + strlen(val) - 1;
725 		lungetc(DONE_EXPAND);
726 		while (p >= val) {
727 			lungetc(*p);
728 			p--;
729 		}
730 		lungetc(START_EXPAND);
731 		goto top;
732 	}
733 
734 	switch (c) {
735 	case '\'':
736 	case '"':
737 		quotec = c;
738 		while (1) {
739 			if ((c = lgetc(quotec)) == EOF)
740 				return 0;
741 			if (c == '\n') {
742 				file->lineno++;
743 				continue;
744 			} else if (c == '\\') {
745 				if ((next = lgetc(quotec)) == EOF)
746 					return (0);
747 				if (next == quotec || next == ' ' ||
748 				    next == '\t')
749 					c = next;
750 				else if (next == '\n') {
751 					file->lineno++;
752 					continue;
753 				} else
754 					lungetc(next);
755 			} else if (c == quotec) {
756 				*p = '\0';
757 				break;
758 			} else if (c == '\0') {
759 				yyerror("invalid syntax");
760 				return findeol();
761 			}
762 			if (p + 1 >= buf + sizeof(buf) - 1) {
763 				yyerror("string too long");
764 				return findeol();
765 			}
766 			*p++ = c;
767 		}
768 		yylval.v.string = strdup(buf);
769 		if (yylval.v.string == NULL)
770 			err(1, "yylex: strdup");
771 		return STRING;
772 	}
773 
774 #define allowed_to_end_number(x) \
775 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
776 
777 	if (c == '-' || isdigit(c)) {
778 		do {
779 			*p++ = c;
780 			if ((size_t)(p-buf) >= sizeof(buf)) {
781 				yyerror("string too long");
782 				return findeol();
783 			}
784 		} while ((c = lgetc(0)) != EOF && isdigit(c));
785 		lungetc(c);
786 		if (p == buf + 1 && buf[0] == '-')
787 			goto nodigits;
788 		if (c == EOF || allowed_to_end_number(c)) {
789 			const char *errstr = NULL;
790 
791 			*p = '\0';
792 			yylval.v.number = strtonum(buf, LLONG_MIN,
793 			    LLONG_MAX, &errstr);
794 			if (errstr) {
795 				yyerror("\"%s\" invalid number: %s",
796 				    buf, errstr);
797 				return findeol();
798 			}
799 			return NUM;
800 		} else {
801 nodigits:
802 			while (p > buf + 1)
803 				lungetc(*--p);
804 			c = *--p;
805 			if (c == '-')
806 				return c;
807 		}
808 	}
809 
810 #define allowed_in_string(x) \
811 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
812 	x != '{' && x != '}' && \
813 	x != '!' && x != '=' && x != '#' && \
814 	x != ',' && x != ';'))
815 
816 	if (isalnum(c) || c == ':' || c == '_') {
817 		do {
818 			*p++ = c;
819 			if ((size_t)(p-buf) >= sizeof(buf)) {
820 				yyerror("string too long");
821 				return findeol();
822 			}
823 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
824 		lungetc(c);
825 		*p = '\0';
826 		if ((token = lookup(buf)) == STRING)
827 			yylval.v.string = xstrdup(buf);
828 		return token;
829 	}
830 	if (c == '\n') {
831 		yylval.lineno = file->lineno;
832 		file->lineno++;
833 	}
834 	if (c == EOF)
835 		return 0;
836 	return c;
837 }
838 
839 struct file *
840 pushfile(const char *name, int secret)
841 {
842 	struct file	*nfile;
843 
844 	nfile = xcalloc(1, sizeof(*nfile));
845 	nfile->name = xstrdup(name);
846 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
847 		log_warn(NULL, "can't open %s: %s", nfile->name,
848 		    strerror(errno));
849 		free(nfile->name);
850 		free(nfile);
851 		return NULL;
852 	}
853 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
854 	nfile->ungetsize = 16;
855 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
856 	TAILQ_INSERT_TAIL(&files, nfile, entry);
857 	return nfile;
858 }
859 
860 int
861 popfile(void)
862 {
863 	struct file	*prev;
864 
865 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
866 		prev->errors += file->errors;
867 
868 	TAILQ_REMOVE(&files, file, entry);
869 	fclose(file->stream);
870 	free(file->name);
871 	free(file->ungetbuf);
872 	free(file);
873 	file = prev;
874 	return file ? 0 : EOF;
875 }
876 
877 void
878 parse_conf(const char *filename)
879 {
880 	struct sym		*sym, *next;
881 
882 	file = pushfile(filename, 0);
883 	if (file == NULL)
884 		exit(1);
885 	topfile = file;
886 
887 	yyparse();
888 	errors = file->errors;
889 	popfile();
890 
891 	/* Free macros and check which have not been used. */
892 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
893 		/* TODO: warn if !sym->used */
894 		if (!sym->persist) {
895 			free(sym->name);
896 			free(sym->val);
897 			TAILQ_REMOVE(&symhead, sym, entry);
898 			free(sym);
899 		}
900 	}
901 
902 	if (errors)
903 		exit(1);
904 }
905 
906 void
907 print_conf(void)
908 {
909 	struct vhost	*h;
910 	/* struct location	*l; */
911 	/* struct envlist	*e; */
912 	/* struct alist	*a; */
913 
914 	if (conf.chroot != NULL)
915 		printf("chroot \"%s\"\n", conf.chroot);
916 	printf("ipv6 %s\n", conf.ipv6 ? "on" : "off");
917 	/* XXX: defined mimes? */
918 	printf("port %d\n", conf.port);
919 	printf("prefork %d\n", conf.prefork);
920 	/* XXX: protocols? */
921 	if (conf.user != NULL)
922 		printf("user \"%s\"\n", conf.user);
923 
924 	TAILQ_FOREACH(h, &hosts, vhosts) {
925 		printf("\nserver \"%s\" {\n", h->domain);
926 		printf("	cert \"%s\"\n", h->cert);
927 		printf("	key \"%s\"\n", h->key);
928 		/* TODO: print locations... */
929 		printf("}\n");
930 	}
931 }
932 
933 int
934 symset(const char *name, const char *val, int persist)
935 {
936 	struct sym *sym;
937 
938 	TAILQ_FOREACH(sym, &symhead, entry) {
939 		if (!strcmp(name, sym->name))
940 			break;
941 	}
942 
943 	if (sym != NULL) {
944 		if (sym->persist)
945 			return 0;
946 		else {
947 			free(sym->name);
948 			free(sym->val);
949 			TAILQ_REMOVE(&symhead, sym, entry);
950 			free(sym);
951 		}
952 	}
953 
954 	sym = xcalloc(1, sizeof(*sym));
955 	sym->name = xstrdup(name);
956 	sym->val = xstrdup(val);
957 	sym->used = 0;
958 	sym->persist = persist;
959 
960 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
961 	return 0;
962 }
963 
964 int
965 cmdline_symset(char *s)
966 {
967 	char	*sym, *val;
968 	int	 ret;
969 
970 	if ((val = strrchr(s, '=')) == NULL)
971 		return -1;
972 	sym = xcalloc(1, val - s + 1);
973 	memcpy(sym, s, val - s);
974 	ret = symset(sym, val + 1, 1);
975 	free(sym);
976 	return ret;
977 }
978 
979 char *
980 symget(const char *nam)
981 {
982 	struct sym	*sym;
983 
984 	TAILQ_FOREACH(sym, &symhead, entry) {
985 		if (strcmp(nam, sym->name) == 0) {
986 			sym->used = 1;
987 			return sym->val;
988 		}
989 	}
990 	return NULL;
991 }
992 
993 struct vhost *
994 new_vhost(void)
995 {
996 	return xcalloc(1, sizeof(struct vhost));
997 }
998 
999 struct location *
1000 new_location(void)
1001 {
1002 	struct location *l;
1003 
1004 	l = xcalloc(1, sizeof(*l));
1005 	l->dirfd = -1;
1006 	l->fcgi = -1;
1007 	return l;
1008 }
1009 
1010 struct proxy *
1011 new_proxy(void)
1012 {
1013 	struct proxy *p;
1014 
1015 	p = xcalloc(1, sizeof(*p));
1016 	p->protocols = TLS_PROTOCOLS_DEFAULT;
1017 	return p;
1018 }
1019 
1020 char *
1021 ensure_absolute_path(char *path)
1022 {
1023 	if (path == NULL || *path != '/')
1024 		yyerror("not an absolute path: %s", path);
1025 	return path;
1026 }
1027 
1028 int
1029 check_block_code(int n)
1030 {
1031 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1032 		yyerror("invalid block code %d", n);
1033 	return n;
1034 }
1035 
1036 char *
1037 check_block_fmt(char *fmt)
1038 {
1039 	char *s;
1040 
1041 	for (s = fmt; *s; ++s) {
1042 		if (*s != '%')
1043 			continue;
1044 		switch (*++s) {
1045 		case '%':
1046 		case 'p':
1047 		case 'q':
1048 		case 'P':
1049 		case 'N':
1050 			break;
1051 		default:
1052 			yyerror("invalid format specifier %%%c", *s);
1053 		}
1054 	}
1055 
1056 	return fmt;
1057 }
1058 
1059 int
1060 check_strip_no(int n)
1061 {
1062 	if (n <= 0)
1063 		yyerror("invalid strip number %d", n);
1064 	return n;
1065 }
1066 
1067 int
1068 check_port_num(int n)
1069 {
1070 	if (n <= 0 || n >= UINT16_MAX)
1071 		yyerror("port number is %s: %d",
1072 		    n <= 0 ? "too small" : "too large",
1073 		    n);
1074 	return n;
1075 }
1076 
1077 int
1078 check_prefork_num(int n)
1079 {
1080 	if (n <= 0 || n >= PROC_MAX)
1081 		yyerror("invalid prefork number %d", n);
1082 	return n;
1083 }
1084 
1085 void
1086 advance_loc(void)
1087 {
1088 	loc = new_location();
1089 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1090 }
1091 
1092 void
1093 advance_proxy(void)
1094 {
1095 	proxy = new_proxy();
1096 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1097 }
1098 
1099 void
1100 parsehp(char *str, char **host, const char **port, const char *def)
1101 {
1102 	char		*at;
1103 	const char	*errstr;
1104 
1105 	*host = str;
1106 
1107 	if ((at = strchr(str, ':')) != NULL) {
1108 		*at++ = '\0';
1109 		*port = at;
1110 	} else
1111 		*port = def;
1112 
1113 	strtonum(*port, 1, UINT16_MAX, &errstr);
1114 	if (errstr != NULL)
1115 		yyerror("port is %s: %s", errstr, *port);
1116 }
1117 
1118 void
1119 only_once(const void *ptr, const char *name)
1120 {
1121 	if (ptr != NULL)
1122 		yyerror("`%s' specified more than once", name);
1123 }
1124 
1125 void
1126 only_oncei(int i, const char *name)
1127 {
1128 	if (i != -1)
1129 		yyerror("`%s' specified more than once", name);
1130 }
1131 
1132 int
1133 fastcgi_conf(char *path, char *port, char *prog)
1134 {
1135 	struct fcgi	*f;
1136 	int		i;
1137 
1138 	for (i = 0; i < FCGI_MAX; ++i) {
1139 		f = &fcgi[i];
1140 
1141 		if (f->path == NULL) {
1142 			f->id = i;
1143 			f->path = path;
1144 			f->port = port;
1145 			f->prog = prog;
1146 			return i;
1147 		}
1148 
1149 		/* XXX: what to do with prog? */
1150 		if (!strcmp(f->path, path) &&
1151 		    ((port == NULL && f->port == NULL) ||
1152 		     !strcmp(f->port, port))) {
1153 			free(path);
1154 			free(port);
1155 			return i;
1156 		}
1157 	}
1158 
1159 	yyerror("too much `fastcgi' rules defined.");
1160 	return -1;
1161 }
1162 
1163 void
1164 add_param(char *name, char *val, int env)
1165 {
1166 	struct envlist *e;
1167 	struct envhead *h;
1168 
1169 	if (env)
1170 		h = &host->env;
1171 	else
1172 		h = &host->params;
1173 
1174 	e = xcalloc(1, sizeof(*e));
1175 	e->name = name;
1176 	e->value = val;
1177 	if (TAILQ_EMPTY(h))
1178 		TAILQ_INSERT_HEAD(h, e, envs);
1179 	else
1180 		TAILQ_INSERT_TAIL(h, e, envs);
1181 }