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