1 %{
2 
3 /*
4  * Copyright (c) 2021, 2022, 2023 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 struct conf *conf;
39 
40 static const char	*default_host = "*";
41 static uint16_t		 default_port = 1965;
42 
43 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
44 static struct file {
45 	TAILQ_ENTRY(file)	 entry;
46 	FILE			*stream;
47 	char			*name;
48 	size_t	 		 ungetpos;
49 	size_t			 ungetsize;
50 	u_char			*ungetbuf;
51 	int			 eof_reached;
52 	int			 lineno;
53 	int			 errors;
54 } *file, *topfile;
55 
56 struct file	*pushfile(const char *, int);
57 int		 popfile(void);
58 int		 yyparse(void);
59 int		 yylex(void);
60 void		 yyerror(const char *, ...)
61     __attribute__((__format__ (printf, 1, 2)))
62     __attribute__((__nonnull__ (1)));
63 void		 yywarn(const char *, ...)
64     __attribute__((__format__ (printf, 1, 2)))
65     __attribute__((__nonnull__ (1)));
66 int		 kw_cmp(const void *, const void *);
67 int		 lookup(char *);
68 int		 igetc(void);
69 int		 lgetc(int);
70 void		 lungetc(int);
71 int		 findeol(void);
72 
73 /*
74  * #define YYDEBUG 1
75  * int yydebug = 1;
76  */
77 
78 TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
79 struct sym {
80 	TAILQ_ENTRY(sym)	 entry;
81 	int			 used;
82 	int			 persist;
83 	char			*name;
84 	char			*val;
85 };
86 
87 int	 symset(const char *, const char *, int);
88 char	*symget(const char *);
89 
90 char		*ensure_absolute_path(char*);
91 int		 check_block_code(int);
92 char		*check_block_fmt(char*);
93 int		 check_strip_no(int);
94 int		 check_port_num(int);
95 int		 check_prefork_num(int);
96 void		 advance_loc(void);
97 void		 advance_proxy(void);
98 void		 parsehp(char *, char **, const char **, const char *);
99 int		 fastcgi_conf(const char *, const char *);
100 void		 add_param(char *, char *);
101 int		 getservice(const char *);
102 void		 listen_on(const char *, const char *);
103 
104 static struct vhost		*host;
105 static struct location		*loc;
106 static struct proxy		*proxy;
107 static char			*current_media;
108 static int			 errors;
109 
110 typedef struct {
111 	union {
112 		char	*string;
113 		int	 number;
114 	} v;
115 	int lineno;
116 } YYSTYPE;
117 
118 #define YYSTYPE YYSTYPE
119 
120 %}
121 
122 /* for bison: */
123 /* %define parse.error verbose */
124 
125 %token	ALIAS AUTO
126 %token	BLOCK
127 %token	CA CERT CHROOT CLIENT
128 %token	DEFAULT
129 %token	FASTCGI FOR_HOST
130 %token	INCLUDE INDEX IPV6
131 %token	KEY
132 %token	LANG LISTEN LOCATION LOG
133 %token	OCSP OFF ON
134 %token	PARAM PORT PREFORK PROTO PROTOCOLS PROXY
135 %token	RELAY_TO REQUIRE RETURN ROOT
136 %token	SERVER SNI STRIP
137 %token	TCP TOEXT TYPE TYPES
138 %token	USE_TLS USER
139 %token	VERIFYNAME
140 
141 %token	ERROR
142 
143 %token	<v.string>	STRING
144 %token	<v.number>	NUM
145 
146 %type	<v.number>	bool proxy_port
147 %type	<v.string>	string numberstring listen_addr
148 
149 %%
150 
151 conf		: /* empty */
152 		| conf include '\n'
153 		| conf '\n'
154 		| conf varset '\n'
155 		| conf option '\n'
156 		| conf vhost '\n'
157 		| conf types '\n'
158 		| conf error '\n'		{ file->errors++; }
159 		;
160 
161 include		: INCLUDE STRING		{
162 			struct file	*nfile;
163 
164 			if ((nfile = pushfile($2, 0)) == NULL) {
165 				yyerror("failed to include file %s", $2);
166 				free($2);
167 				YYERROR;
168 			}
169 			free($2);
170 
171 			file = nfile;
172 			lungetc('\n');
173 		}
174 		;
175 
176 bool		: ON	{ $$ = 1; }
177 		| OFF	{ $$ = 0; }
178 		;
179 
180 string		: string STRING	{
181 			if (asprintf(&$$, "%s%s", $1, $2) == -1) {
182 				free($1);
183 				free($2);
184 				yyerror("string: asprintf: %s", strerror(errno));
185 				YYERROR;
186 			}
187 			free($1);
188 			free($2);
189 		}
190 		| STRING
191 		;
192 
193 numberstring	: NUM {
194 			char *s;
195 			if (asprintf(&s, "%d", $1) == -1) {
196 				yyerror("asprintf: number");
197 				YYERROR;
198 			}
199 			$$ = s;
200 		}
201 		| STRING
202 		;
203 
204 varset		: STRING '=' string		{
205 			char *s = $1;
206 			while (*s++) {
207 				if (isspace((unsigned char)*s)) {
208 					yyerror("macro name cannot contain "
209 					    "whitespaces");
210 					free($1);
211 					free($3);
212 					YYERROR;
213 				}
214 			}
215 			symset($1, $3, 0);
216 			free($1);
217 			free($3);
218 		}
219 		;
220 
221 option		: CHROOT string	{
222 			if (strlcpy(conf->chroot, $2, sizeof(conf->chroot)) >=
223 			    sizeof(conf->chroot))
224 				yyerror("chroot path too long");
225 			free($2);
226 		}
227 		| IPV6 bool {
228 			yywarn("option `ipv6' is deprecated,"
229 			    " please use `listen on'");
230 			if ($2)
231 				default_host = "*";
232 			else
233 				default_host = "0.0.0.0";
234 		}
235 		| PORT NUM {
236 			yywarn("option `port' is deprecated,"
237 			    " please use `listen on'");
238 			default_port = $2;
239 		}
240 		| PREFORK NUM		{ conf->prefork = check_prefork_num($2); }
241 		| PROTOCOLS string {
242 			if (tls_config_parse_protocols(&conf->protos, $2) == -1)
243 				yyerror("invalid protocols string \"%s\"", $2);
244 			free($2);
245 		}
246 		| USER string {
247 			if (strlcpy(conf->user, $2, sizeof(conf->user)) >=
248 			    sizeof(conf->user))
249 				yyerror("user name too long");
250 			free($2);
251 		}
252 		;
253 
254 vhost		: SERVER string {
255 			host = new_vhost();
256 			TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
257 
258 			loc = new_location();
259 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
260 
261 			TAILQ_INIT(&host->proxies);
262 
263 			(void) strlcpy(loc->match, "*", sizeof(loc->match));
264 			(void) strlcpy(host->domain, $2, sizeof(host->domain));
265 
266 			if (strstr($2, "xn--") != NULL) {
267 				yywarn("\"%s\" looks like punycode: you "
268 				    "should use the decoded hostname", $2);
269 			}
270 
271 			free($2);
272 		} '{' optnl servbody '}' {
273 			if (host->cert_path == NULL ||
274 			    host->key_path == NULL)
275 				yyerror("invalid vhost definition: %s",
276 				    host->domain);
277 			if (TAILQ_EMPTY(&host->addrs)) {
278 				char portno[32];
279 				int r;
280 
281 				r = snprintf(portno, sizeof(portno), "%d",
282 				    default_port);
283 				if (r < 0 || (size_t)r >= sizeof(portno))
284 					fatal("snprintf");
285 
286 				yywarn("missing `listen on' in server %s,"
287 				    " assuming %s port %d", $2, default_host,
288 				    default_port);
289 				listen_on(default_host, portno);
290 			}
291 		}
292 		| error '}'		{ yyerror("bad server directive"); }
293 		;
294 
295 servbody	: /* empty */
296 		| servbody servopt optnl
297 		| servbody location optnl
298 		| servbody proxy optnl
299 		;
300 
301 listen_addr	: '*' { $$ = NULL; }
302 		| STRING
303 		;
304 
305 servopt		: ALIAS string {
306 			struct alist *a;
307 
308 			a = xcalloc(1, sizeof(*a));
309 			(void) strlcpy(a->alias, $2, sizeof(a->alias));
310 			free($2);
311 			TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
312 		}
313 		| CERT string		{
314 			ensure_absolute_path($2);
315 			free(host->cert_path);
316 			host->cert_path = $2;
317 		}
318 		| KEY string		{
319 			ensure_absolute_path($2);
320 			free(host->key_path);
321 			host->key_path = $2;
322 		}
323 		| OCSP string		{
324 			ensure_absolute_path($2);
325 			free(host->ocsp_path);
326 			host->ocsp_path = $2;
327 		}
328 		| PARAM string '=' string {
329 			add_param($2, $4);
330 		}
331 		| LISTEN ON listen_addr {
332 			listen_on($3, "1965");
333 		}
334 		| LISTEN ON listen_addr PORT STRING {
335 			listen_on($3, $5);
336 			free($3);
337 			free($5);
338 		}
339 		| LISTEN ON listen_addr PORT NUM {
340 			char portno[32];
341 			int r;
342 
343 			r = snprintf(portno, sizeof(portno), "%d", $5);
344 			if (r < 0 || (size_t)r >= sizeof(portno))
345 				fatal("snprintf");
346 
347 			listen_on($3, portno);
348 			free($3);
349 		}
350 		| locopt
351 		;
352 
353 proxy		: PROXY { advance_proxy(); }
354 		  proxy_matches '{' optnl proxy_opts '}' {
355 			if (*proxy->host == '\0')
356 				yyerror("invalid proxy block: missing `relay-to' option");
357 
358 			if ((proxy->cert_path == NULL && proxy->key_path != NULL) ||
359 			    (proxy->cert_path != NULL && proxy->key_path == NULL))
360 				yyerror("invalid proxy block: missing cert or key");
361 		}
362 		;
363 
364 proxy_matches	: /* empty */
365 		| proxy_matches proxy_match
366 		;
367 
368 proxy_port	: /* empty */	{ $$ = 1965; }
369 		| PORT STRING {
370 			if (($$ = getservice($2)) == -1)
371 				yyerror("invalid port number %s", $2);
372 			free($2);
373 		}
374 		| PORT NUM	{ $$ = $2; }
375 		;
376 
377 proxy_match	: PROTO string {
378 			(void) strlcpy(proxy->match_proto, $2, sizeof(proxy->match_proto));
379 			free($2);
380 		}
381 		| FOR_HOST string proxy_port {
382 			(void) strlcpy(proxy->match_host, $2, sizeof(proxy->match_host));
383 			(void) snprintf(proxy->match_port, sizeof(proxy->match_port),
384 			    "%d", $3);
385 			free($2);
386 		}
387 		;
388 
389 proxy_opts	: /* empty */
390 		| proxy_opts proxy_opt optnl
391 		;
392 
393 proxy_opt	: CERT string {
394 			free(proxy->cert);
395 			ensure_absolute_path($2);
396 			proxy->cert_path = $2;
397 		}
398 		| KEY string {
399 			free(proxy->key);
400 			ensure_absolute_path($2);
401 			proxy->key_path = $2;
402 		}
403 		| PROTOCOLS string {
404 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
405 				yyerror("invalid protocols string \"%s\"", $2);
406 			free($2);
407 		}
408 		| RELAY_TO string proxy_port {
409 			(void) strlcpy(proxy->host, $2, sizeof(proxy->host));
410 			(void) snprintf(proxy->port, sizeof(proxy->port),
411 			    "%d", $3);
412 			free($2);
413 		}
414 		| REQUIRE CLIENT CA string {
415 			ensure_absolute_path($4);
416 			proxy->reqca_path = $4;
417 		}
418 		| SNI string {
419 			(void) strlcpy(proxy->sni, $2, sizeof(proxy->sni));
420 			free($2);
421 		}
422 		| USE_TLS bool {
423 			proxy->notls = !$2;
424 		}
425 		| VERIFYNAME bool {
426 			proxy->noverifyname = !$2;
427 		}
428 		;
429 
430 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
431 			/* drop the starting '/' if any */
432 			if (*$3 == '/')
433 				memmove($3, $3+1, strlen($3));
434 			(void) strlcpy(loc->match, $3, sizeof(loc->match));
435 			free($3);
436 		}
437 		| error '}'
438 		;
439 
440 locopts		: /* empty */
441 		| locopts locopt optnl
442 		;
443 
444 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
445 		| BLOCK RETURN NUM string {
446 			check_block_fmt($4);
447 			(void) strlcpy(loc->block_fmt, $4, sizeof(loc->block_fmt));
448 			loc->block_code = check_block_code($3);
449 			free($4);
450 		}
451 		| BLOCK RETURN NUM {
452 			(void) strlcpy(loc->block_fmt, "temporary failure",
453 			    sizeof(loc->block_fmt));
454 			loc->block_code = check_block_code($3);
455 			if ($3 >= 30 && $3 < 40)
456 				yyerror("missing `meta' for block return %d", $3);
457 		}
458 		| BLOCK {
459 			(void) strlcpy(loc->block_fmt, "temporary failure",
460 			    sizeof(loc->block_fmt));
461 			loc->block_code = 40;
462 		}
463 		| DEFAULT TYPE string {
464 			(void) strlcpy(loc->default_mime, $3,
465 			    sizeof(loc->default_mime));
466 			free($3);
467 		}
468 		| FASTCGI fastcgi
469 		| INDEX string {
470 			(void) strlcpy(loc->index, $2, sizeof(loc->index));
471 			free($2);
472 		}
473 		| LANG string {
474 			(void) strlcpy(loc->lang, $2,
475 			    sizeof(loc->lang));
476 			free($2);
477 		}
478 		| LOG bool	{ loc->disable_log = !$2; }
479 		| REQUIRE CLIENT CA string {
480 			ensure_absolute_path($4);
481 			loc->reqca_path = $4;
482 		}
483 		| ROOT string		{
484 			(void) strlcpy(loc->dir, $2, sizeof(loc->dir));
485 			free($2);
486 		}
487 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
488 		;
489 
490 fastcgi		: string {
491 			loc->fcgi = fastcgi_conf($1, NULL);
492 			free($1);
493 		}
494 		| TCP string PORT NUM {
495 			char *c;
496 			if (asprintf(&c, "%d", $4) == -1)
497 				fatal("asprintf");
498 			loc->fcgi = fastcgi_conf($2, c);
499 			free($2);
500 		}
501 		| TCP string {
502 			loc->fcgi = fastcgi_conf($2, "9000");
503 			free($2);
504 		}
505 		| TCP string PORT string {
506 			loc->fcgi = fastcgi_conf($2, $4);
507 			free($2);
508 			free($4);
509 		}
510 		;
511 
512 types		: TYPES '{' optnl mediaopts_l '}' ;
513 
514 mediaopts_l	: mediaopts_l mediaoptsl nl
515 		| mediaoptsl nl
516 		;
517 
518 mediaoptsl	: STRING {
519 			free(current_media);
520 			current_media = $1;
521 		} medianames_l optsemicolon
522 		| include
523 		;
524 
525 medianames_l	: medianames_l medianamesl
526 		| medianamesl
527 		;
528 
529 medianamesl	: numberstring {
530 			if (add_mime(&conf->mime, current_media, $1) == -1)
531 				fatal("add_mime");
532 			free($1);
533 		}
534 		;
535 
536 nl		: '\n' optnl
537 		;
538 
539 optnl		: '\n' optnl		/* zero or more newlines */
540 		| ';' optnl		/* semicolons too */
541 		| /*empty*/
542 		;
543 
544 optsemicolon	: ';'
545 		|
546 		;
547 
548 %%
549 
550 static const struct keyword {
551 	const char *word;
552 	int token;
553 } keywords[] = {
554 	/* these MUST be sorted */
555 	{"alias", ALIAS},
556 	{"auto", AUTO},
557 	{"block", BLOCK},
558 	{"ca", CA},
559 	{"cert", CERT},
560 	{"chroot", CHROOT},
561 	{"client", CLIENT},
562 	{"default", DEFAULT},
563 	{"fastcgi", FASTCGI},
564 	{"for-host", FOR_HOST},
565 	{"include", INCLUDE},
566 	{"index", INDEX},
567 	{"ipv6", IPV6},
568 	{"key", KEY},
569 	{"lang", LANG},
570 	{"listen", LISTEN},
571 	{"location", LOCATION},
572 	{"log", LOG},
573 	{"ocsp", OCSP},
574 	{"off", OFF},
575 	{"on", ON},
576 	{"param", PARAM},
577 	{"port", PORT},
578 	{"prefork", PREFORK},
579 	{"proto", PROTO},
580 	{"protocols", PROTOCOLS},
581 	{"proxy", PROXY},
582 	{"relay-to", RELAY_TO},
583 	{"require", REQUIRE},
584 	{"return", RETURN},
585 	{"root", ROOT},
586 	{"server", SERVER},
587 	{"sni", SNI},
588 	{"strip", STRIP},
589 	{"tcp", TCP},
590 	{"to-ext", TOEXT},
591 	{"type", TYPE},
592 	{"types", TYPES},
593 	{"use-tls", USE_TLS},
594 	{"user", USER},
595 	{"verifyname", VERIFYNAME},
596 };
597 
598 void
599 yyerror(const char *msg, ...)
600 {
601 	va_list ap;
602 
603 	file->errors++;
604 
605 	va_start(ap, msg);
606 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
607 	vfprintf(stderr, msg, ap);
608 	fprintf(stderr, "\n");
609 	va_end(ap);
610 }
611 
612 void
613 yywarn(const char *msg, ...)
614 {
615 	va_list ap;
616 
617 	va_start(ap, msg);
618 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
619 	vfprintf(stderr, msg, ap);
620 	fprintf(stderr, "\n");
621 	va_end(ap);
622 }
623 
624 int
625 kw_cmp(const void *k, const void *e)
626 {
627 	return strcmp(k, ((struct keyword *)e)->word);
628 }
629 
630 int
631 lookup(char *s)
632 {
633 	const struct keyword	*p;
634 
635 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
636 	    sizeof(keywords[0]), kw_cmp);
637 
638 	if (p)
639 		return p->token;
640 	else
641 		return STRING;
642 }
643 
644 #define START_EXPAND	1
645 #define DONE_EXPAND	2
646 
647 static int	expanding;
648 
649 int
650 igetc(void)
651 {
652 	int	c;
653 
654 	while (1) {
655 		if (file->ungetpos > 0)
656 			c = file->ungetbuf[--file->ungetpos];
657 		else
658 			c = getc(file->stream);
659 
660 		if (c == START_EXPAND)
661 			expanding = 1;
662 		else if (c == DONE_EXPAND)
663 			expanding = 0;
664 		else
665 			break;
666 	}
667 	return c;
668 }
669 
670 int
671 lgetc(int quotec)
672 {
673 	int		c, next;
674 
675 	if (quotec) {
676 		if ((c = igetc()) == EOF) {
677 			yyerror("reached end of file while parsing "
678 			    "quoted string");
679 			if (file == topfile || popfile() == EOF)
680 				return EOF;
681 			return quotec;
682 		}
683 		return c;
684 	}
685 
686 	while ((c = igetc()) == '\\') {
687 		next = igetc();
688 		if (next != '\n') {
689 			c = next;
690 			break;
691 		}
692 		yylval.lineno = file->lineno;
693 		file->lineno++;
694 	}
695 
696 	if (c == EOF) {
697 		/*
698 		 * Fake EOL when hit EOF for the first time. This gets line
699 		 * count right if last line in included file is syntactically
700 		 * invalid and has no newline.
701 		 */
702 		if (file->eof_reached == 0) {
703 			file->eof_reached = 1;
704 			return '\n';
705 		}
706 		while (c == EOF) {
707 			if (file == topfile || popfile() == EOF)
708 				return EOF;
709 			c = igetc();
710 		}
711 	}
712 	return c;
713 }
714 
715 void
716 lungetc(int c)
717 {
718 	if (c == EOF)
719 		return;
720 
721 	if (file->ungetpos >= file->ungetsize) {
722 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
723 		if (p == NULL)
724 			fatal("lungetc");
725 		file->ungetbuf = p;
726 		file->ungetsize *= 2;
727 	}
728 	file->ungetbuf[file->ungetpos++] = c;
729 }
730 
731 int
732 findeol(void)
733 {
734 	int	c;
735 
736 	/* Skip to either EOF or the first real EOL. */
737 	while (1) {
738 		c = lgetc(0);
739 		if (c == '\n') {
740 			file->lineno++;
741 			break;
742 		}
743 		if (c == EOF)
744 			break;
745 	}
746 	return ERROR;
747 }
748 
749 int
750 yylex(void)
751 {
752 	char	 buf[8096];
753 	char	*p, *val;
754 	int	 quotec, next, c;
755 	int	 token;
756 
757 top:
758 	p = buf;
759 	while ((c = lgetc(0)) == ' ' || c == '\t')
760 		; /* nothing */
761 
762 	yylval.lineno = file->lineno;
763 	if (c == '#')
764 		while ((c = lgetc(0)) != '\n' && c != EOF)
765 			; /* nothing */
766 	if (c == '$' && !expanding) {
767 		while (1) {
768 			if ((c = lgetc(0)) == EOF)
769 				return 0;
770 			if (p + 1 >= buf + sizeof(buf) -1) {
771 				yyerror("string too long");
772 				return findeol();
773 			}
774 			if (isalnum(c) || c == '_') {
775 				*p++ = c;
776 				continue;
777 			}
778 			*p = '\0';
779 			lungetc(c);
780 			break;
781 		}
782 		val = symget(buf);
783 		if (val == NULL) {
784 			yyerror("macro `%s' not defined", buf);
785 			return findeol();
786 		}
787 		yylval.v.string = xstrdup(val);
788 		return STRING;
789 	}
790 	if (c == '@' && !expanding) {
791 		while (1) {
792 			if ((c = lgetc(0)) == EOF)
793 				return 0;
794 
795 			if (p + 1 >= buf + sizeof(buf) - 1) {
796 				yyerror("string too long");
797 				return findeol();
798 			}
799 			if (isalnum(c) || c == '_') {
800 				*p++ = c;
801 				continue;
802 			}
803 			*p = '\0';
804 			lungetc(c);
805 			break;
806 		}
807 		val = symget(buf);
808 		if (val == NULL) {
809 			yyerror("macro '%s' not defined", buf);
810 			return findeol();
811 		}
812 		p = val + strlen(val) - 1;
813 		lungetc(DONE_EXPAND);
814 		while (p >= val) {
815 			lungetc(*p);
816 			p--;
817 		}
818 		lungetc(START_EXPAND);
819 		goto top;
820 	}
821 
822 	switch (c) {
823 	case '\'':
824 	case '"':
825 		quotec = c;
826 		while (1) {
827 			if ((c = lgetc(quotec)) == EOF)
828 				return 0;
829 			if (c == '\n') {
830 				file->lineno++;
831 				continue;
832 			} else if (c == '\\') {
833 				if ((next = lgetc(quotec)) == EOF)
834 					return (0);
835 				if (next == quotec || next == ' ' ||
836 				    next == '\t')
837 					c = next;
838 				else if (next == '\n') {
839 					file->lineno++;
840 					continue;
841 				} else
842 					lungetc(next);
843 			} else if (c == quotec) {
844 				*p = '\0';
845 				break;
846 			} else if (c == '\0') {
847 				yyerror("invalid syntax");
848 				return findeol();
849 			}
850 			if (p + 1 >= buf + sizeof(buf) - 1) {
851 				yyerror("string too long");
852 				return findeol();
853 			}
854 			*p++ = c;
855 		}
856 		yylval.v.string = strdup(buf);
857 		if (yylval.v.string == NULL)
858 			fatal("yylex: strdup");
859 		return STRING;
860 	}
861 
862 #define allowed_to_end_number(x) \
863 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
864 
865 	if (c == '-' || isdigit(c)) {
866 		do {
867 			*p++ = c;
868 			if ((size_t)(p-buf) >= sizeof(buf)) {
869 				yyerror("string too long");
870 				return findeol();
871 			}
872 		} while ((c = lgetc(0)) != EOF && isdigit(c));
873 		lungetc(c);
874 		if (p == buf + 1 && buf[0] == '-')
875 			goto nodigits;
876 		if (c == EOF || allowed_to_end_number(c)) {
877 			const char *errstr = NULL;
878 
879 			*p = '\0';
880 			yylval.v.number = strtonum(buf, LLONG_MIN,
881 			    LLONG_MAX, &errstr);
882 			if (errstr) {
883 				yyerror("\"%s\" invalid number: %s",
884 				    buf, errstr);
885 				return findeol();
886 			}
887 			return NUM;
888 		} else {
889 nodigits:
890 			while (p > buf + 1)
891 				lungetc(*--p);
892 			c = *--p;
893 			if (c == '-')
894 				return c;
895 		}
896 	}
897 
898 #define allowed_in_string(x) \
899 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
900 	x != '{' && x != '}' && \
901 	x != '!' && x != '=' && x != '#' && \
902 	x != ',' && x != ';'))
903 
904 	if (isalnum(c) || c == ':' || c == '_') {
905 		do {
906 			*p++ = c;
907 			if ((size_t)(p-buf) >= sizeof(buf)) {
908 				yyerror("string too long");
909 				return findeol();
910 			}
911 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
912 		lungetc(c);
913 		*p = '\0';
914 		if ((token = lookup(buf)) == STRING)
915 			yylval.v.string = xstrdup(buf);
916 		return token;
917 	}
918 	if (c == '\n') {
919 		yylval.lineno = file->lineno;
920 		file->lineno++;
921 	}
922 	if (c == EOF)
923 		return 0;
924 	return c;
925 }
926 
927 struct file *
928 pushfile(const char *name, int secret)
929 {
930 	struct file	*nfile;
931 
932 	nfile = xcalloc(1, sizeof(*nfile));
933 	nfile->name = xstrdup(name);
934 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
935 		log_warn("can't open %s", nfile->name);
936 		free(nfile->name);
937 		free(nfile);
938 		return NULL;
939 	}
940 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
941 	nfile->ungetsize = 16;
942 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
943 	TAILQ_INSERT_TAIL(&files, nfile, entry);
944 	return nfile;
945 }
946 
947 int
948 popfile(void)
949 {
950 	struct file	*prev;
951 
952 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
953 		prev->errors += file->errors;
954 
955 	TAILQ_REMOVE(&files, file, entry);
956 	fclose(file->stream);
957 	free(file->name);
958 	free(file->ungetbuf);
959 	free(file);
960 	file = prev;
961 	return file ? 0 : EOF;
962 }
963 
964 int
965 parse_conf(struct conf *c, const char *filename)
966 {
967 	struct sym		*sym, *next;
968 
969 	default_host = "*";
970 	default_port = 1965;
971 
972 	conf = c;
973 
974 	file = pushfile(filename, 0);
975 	if (file == NULL)
976 		return -1;
977 	topfile = file;
978 
979 	yyparse();
980 	errors = file->errors;
981 	popfile();
982 
983 	/* Free macros and check which have not been used. */
984 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
985 		/* TODO: warn if !sym->used */
986 		if (!sym->persist) {
987 			free(sym->name);
988 			free(sym->val);
989 			TAILQ_REMOVE(&symhead, sym, entry);
990 			free(sym);
991 		}
992 	}
993 
994 	if (errors)
995 		return -1;
996 	return 0;
997 }
998 
999 int
1000 symset(const char *name, const char *val, int persist)
1001 {
1002 	struct sym *sym;
1003 
1004 	TAILQ_FOREACH(sym, &symhead, entry) {
1005 		if (!strcmp(name, sym->name))
1006 			break;
1007 	}
1008 
1009 	if (sym != NULL) {
1010 		if (sym->persist)
1011 			return 0;
1012 		else {
1013 			free(sym->name);
1014 			free(sym->val);
1015 			TAILQ_REMOVE(&symhead, sym, entry);
1016 			free(sym);
1017 		}
1018 	}
1019 
1020 	sym = xcalloc(1, sizeof(*sym));
1021 	sym->name = xstrdup(name);
1022 	sym->val = xstrdup(val);
1023 	sym->used = 0;
1024 	sym->persist = persist;
1025 
1026 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1027 	return 0;
1028 }
1029 
1030 int
1031 cmdline_symset(char *s)
1032 {
1033 	char	*sym, *val;
1034 	int	 ret;
1035 
1036 	if ((val = strrchr(s, '=')) == NULL)
1037 		return -1;
1038 	sym = xcalloc(1, val - s + 1);
1039 	memcpy(sym, s, val - s);
1040 	ret = symset(sym, val + 1, 1);
1041 	free(sym);
1042 	return ret;
1043 }
1044 
1045 char *
1046 symget(const char *nam)
1047 {
1048 	struct sym	*sym;
1049 
1050 	TAILQ_FOREACH(sym, &symhead, entry) {
1051 		if (strcmp(nam, sym->name) == 0) {
1052 			sym->used = 1;
1053 			return sym->val;
1054 		}
1055 	}
1056 	return NULL;
1057 }
1058 
1059 char *
1060 ensure_absolute_path(char *path)
1061 {
1062 	if (path == NULL || *path != '/')
1063 		yyerror("not an absolute path: %s", path);
1064 	return path;
1065 }
1066 
1067 int
1068 check_block_code(int n)
1069 {
1070 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1071 		yyerror("invalid block code %d", n);
1072 	return n;
1073 }
1074 
1075 char *
1076 check_block_fmt(char *fmt)
1077 {
1078 	char *s;
1079 
1080 	for (s = fmt; *s; ++s) {
1081 		if (*s != '%')
1082 			continue;
1083 		switch (*++s) {
1084 		case '%':
1085 		case 'p':
1086 		case 'q':
1087 		case 'P':
1088 		case 'N':
1089 			break;
1090 		default:
1091 			yyerror("invalid format specifier %%%c", *s);
1092 		}
1093 	}
1094 
1095 	return fmt;
1096 }
1097 
1098 int
1099 check_strip_no(int n)
1100 {
1101 	if (n <= 0)
1102 		yyerror("invalid strip number %d", n);
1103 	return n;
1104 }
1105 
1106 int
1107 check_port_num(int n)
1108 {
1109 	if (n <= 0 || n >= UINT16_MAX)
1110 		yyerror("port number is %s: %d",
1111 		    n <= 0 ? "too small" : "too large",
1112 		    n);
1113 	return n;
1114 }
1115 
1116 int
1117 check_prefork_num(int n)
1118 {
1119 	if (n <= 0 || n >= PROC_MAX_INSTANCES)
1120 		yyerror("invalid prefork number %d", n);
1121 	return n;
1122 }
1123 
1124 void
1125 advance_loc(void)
1126 {
1127 	loc = new_location();
1128 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1129 }
1130 
1131 void
1132 advance_proxy(void)
1133 {
1134 	proxy = new_proxy();
1135 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1136 }
1137 
1138 void
1139 parsehp(char *str, char **host, const char **port, const char *def)
1140 {
1141 	char		*at;
1142 	const char	*errstr;
1143 
1144 	*host = str;
1145 
1146 	if ((at = strchr(str, ':')) != NULL) {
1147 		*at++ = '\0';
1148 		*port = at;
1149 	} else
1150 		*port = def;
1151 
1152 	strtonum(*port, 1, UINT16_MAX, &errstr);
1153 	if (errstr != NULL)
1154 		yyerror("port is %s: %s", errstr, *port);
1155 }
1156 
1157 int
1158 fastcgi_conf(const char *path, const char *port)
1159 {
1160 	struct fcgi	*f;
1161 	int		i = 0;
1162 
1163 	TAILQ_FOREACH(f, &conf->fcgi, fcgi) {
1164 		if (!strcmp(f->path, path) &&
1165 		    ((port == NULL && *f->port == '\0') ||
1166 		     !strcmp(f->port, port)))
1167 			return i;
1168 		++i;
1169 	}
1170 
1171 	f = xcalloc(1, sizeof(*f));
1172 	f->id = i;
1173 	(void)strlcpy(f->path, path, sizeof(f->path));
1174 	if (port != NULL)
1175 		(void)strlcpy(f->port, port, sizeof(f->port));
1176 	TAILQ_INSERT_TAIL(&conf->fcgi, f, fcgi);
1177 
1178 	return f->id;
1179 }
1180 
1181 void
1182 add_param(char *name, char *val)
1183 {
1184 	struct envlist *e;
1185 	struct envhead *h = &host->params;
1186 
1187 	e = xcalloc(1, sizeof(*e));
1188 	(void) strlcpy(e->name, name, sizeof(e->name));
1189 	(void) strlcpy(e->value, val, sizeof(e->value));
1190 	TAILQ_INSERT_TAIL(h, e, envs);
1191 }
1192 
1193 int
1194 getservice(const char *n)
1195 {
1196 	struct servent	*s;
1197 	const char	*errstr;
1198 	long long	 llval;
1199 
1200 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1201 	if (errstr) {
1202 		s = getservbyname(n, "tcp");
1203 		if (s == NULL)
1204 			s = getservbyname(n, "udp");
1205 		if (s == NULL)
1206 			return (-1);
1207 		return (ntohs(s->s_port));
1208 	}
1209 
1210 	return ((unsigned short)llval);
1211 }
1212 
1213 static void
1214 add_to_addr_queue(struct addrhead *a, struct addrinfo *ai)
1215 {
1216 	struct address		*addr;
1217 	struct sockaddr_in	*sin;
1218 	struct sockaddr_in6	*sin6;
1219 
1220 	if (ai->ai_addrlen > sizeof(addr->ss))
1221 		fatalx("ai_addrlen larger than a sockaddr_storage");
1222 
1223 	TAILQ_FOREACH(addr, a, addrs) {
1224 		if (addr->ai_flags == ai->ai_flags &&
1225 		    addr->ai_family == ai->ai_family &&
1226 		    addr->ai_socktype == ai->ai_socktype &&
1227 		    addr->ai_protocol == ai->ai_protocol &&
1228 		    addr->slen == ai->ai_addrlen &&
1229 		    !memcmp(&addr->ss, ai->ai_addr, addr->slen))
1230 			return;
1231 	}
1232 
1233 	addr = xcalloc(1, sizeof(*addr));
1234 	addr->ai_flags = ai->ai_flags;
1235 	addr->ai_family = ai->ai_family;
1236 	addr->ai_socktype = ai->ai_socktype;
1237 	addr->ai_protocol = ai->ai_protocol;
1238 	addr->slen = ai->ai_addrlen;
1239 	memcpy(&addr->ss, ai->ai_addr, ai->ai_addrlen);
1240 
1241 	/* for commodity */
1242 	switch (addr->ai_family) {
1243 	case AF_INET:
1244 		sin = (struct sockaddr_in *)&addr->ss;
1245 		addr->port = ntohs(sin->sin_port);
1246 		break;
1247 	case AF_INET6:
1248 		sin6 = (struct sockaddr_in6 *)&addr->ss;
1249 		addr->port = ntohs(sin6->sin6_port);
1250 		break;
1251 	default:
1252 		fatalx("unknown socket family %d", addr->ai_family);
1253 	}
1254 
1255 	addr->sock = -1;
1256 
1257 	TAILQ_INSERT_HEAD(a, addr, addrs);
1258 }
1259 
1260 void
1261 listen_on(const char *hostname, const char *servname)
1262 {
1263 	struct addrinfo hints, *res, *res0;
1264 	int error;
1265 
1266 	memset(&hints, 0, sizeof(hints));
1267 	hints.ai_family = AF_UNSPEC;
1268 	hints.ai_socktype = SOCK_STREAM;
1269 	hints.ai_flags = AI_PASSIVE;
1270 	error = getaddrinfo(hostname, servname, &hints, &res0);
1271 	if (error) {
1272 		yyerror("listen on \"%s\" port %s: %s", hostname, servname,
1273 		    gai_strerror(errno));
1274 		return;
1275 	}
1276 
1277 	for (res = res0; res; res = res->ai_next) {
1278 		add_to_addr_queue(&host->addrs, res);
1279 		add_to_addr_queue(&conf->addrs, res);
1280 	}
1281 
1282 	freeaddrinfo(res0);
1283 }