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	ACCESS 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 SOCKET STRIP SYSLOG
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 		| log
236 		| PORT NUM {
237 			yywarn("option `port' is deprecated,"
238 			    " please use `listen on'");
239 			default_port = $2;
240 		}
241 		| PREFORK NUM		{ conf->prefork = check_prefork_num($2); }
242 		| PROTOCOLS string {
243 			if (tls_config_parse_protocols(&conf->protos, $2) == -1)
244 				yyerror("invalid protocols string \"%s\"", $2);
245 			free($2);
246 		}
247 		| USER string {
248 			if (strlcpy(conf->user, $2, sizeof(conf->user)) >=
249 			    sizeof(conf->user))
250 				yyerror("user name too long");
251 			free($2);
252 		}
253 		;
254 
255 log		: LOG '{' optnl logopts '}'
256 		| LOG logopt
257 		;
258 
259 logopts		: /* empty */
260 		| logopts logopt optnl
261 		;
262 
263 logopt		: SYSLOG		{
264 			free(conf->log_access);
265 			conf->log_access = NULL;
266 		}
267 		| ACCESS string		{
268 			free(conf->log_access);
269 			conf->log_access = $2;
270 		}
271 		;
272 
273 vhost		: SERVER string {
274 			host = new_vhost();
275 			TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
276 
277 			loc = new_location();
278 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
279 
280 			TAILQ_INIT(&host->proxies);
281 
282 			(void) strlcpy(loc->match, "*", sizeof(loc->match));
283 			(void) strlcpy(host->domain, $2, sizeof(host->domain));
284 
285 			if (strstr($2, "xn--") != NULL) {
286 				yywarn("\"%s\" looks like punycode: you "
287 				    "should use the decoded hostname", $2);
288 			}
289 
290 			free($2);
291 		} '{' optnl servbody '}' {
292 			if (host->cert_path == NULL ||
293 			    host->key_path == NULL)
294 				yyerror("invalid vhost definition: %s",
295 				    host->domain);
296 			if (TAILQ_EMPTY(&host->addrs)) {
297 				char portno[32];
298 				int r;
299 
300 				r = snprintf(portno, sizeof(portno), "%d",
301 				    default_port);
302 				if (r < 0 || (size_t)r >= sizeof(portno))
303 					fatal("snprintf");
304 
305 				yywarn("missing `listen on' in server %s,"
306 				    " assuming %s port %d", $2, default_host,
307 				    default_port);
308 				listen_on(default_host, portno);
309 			}
310 		}
311 		| error '}'		{ yyerror("bad server directive"); }
312 		;
313 
314 servbody	: /* empty */
315 		| servbody servopt optnl
316 		| servbody location optnl
317 		| servbody proxy optnl
318 		;
319 
320 listen_addr	: '*' { $$ = NULL; }
321 		| STRING
322 		;
323 
324 servopt		: ALIAS string {
325 			struct alist *a;
326 
327 			a = xcalloc(1, sizeof(*a));
328 			(void) strlcpy(a->alias, $2, sizeof(a->alias));
329 			free($2);
330 			TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
331 		}
332 		| CERT string		{
333 			ensure_absolute_path($2);
334 			free(host->cert_path);
335 			host->cert_path = $2;
336 		}
337 		| KEY string		{
338 			ensure_absolute_path($2);
339 			free(host->key_path);
340 			host->key_path = $2;
341 		}
342 		| OCSP string		{
343 			ensure_absolute_path($2);
344 			free(host->ocsp_path);
345 			host->ocsp_path = $2;
346 		}
347 		| PARAM string '=' string {
348 			yywarn("the top-level `param' directive is deprecated."
349 			    "  Please use `fastcgi { param ... }`");
350 			add_param($2, $4);
351 		}
352 		| LISTEN ON listen_addr {
353 			listen_on($3, "1965");
354 		}
355 		| LISTEN ON listen_addr PORT STRING {
356 			listen_on($3, $5);
357 			free($3);
358 			free($5);
359 		}
360 		| LISTEN ON listen_addr PORT NUM {
361 			char portno[32];
362 			int r;
363 
364 			r = snprintf(portno, sizeof(portno), "%d", $5);
365 			if (r < 0 || (size_t)r >= sizeof(portno))
366 				fatal("snprintf");
367 
368 			listen_on($3, portno);
369 			free($3);
370 		}
371 		| locopt
372 		;
373 
374 proxy		: PROXY { advance_proxy(); }
375 		  proxy_matches '{' optnl proxy_opts '}' {
376 			if (*proxy->host == '\0')
377 				yyerror("invalid proxy block: missing `relay-to' option");
378 
379 			if ((proxy->cert_path == NULL && proxy->key_path != NULL) ||
380 			    (proxy->cert_path != NULL && proxy->key_path == NULL))
381 				yyerror("invalid proxy block: missing cert or key");
382 		}
383 		;
384 
385 proxy_matches	: /* empty */
386 		| proxy_matches proxy_match
387 		;
388 
389 proxy_port	: /* empty */	{ $$ = 1965; }
390 		| PORT STRING {
391 			if (($$ = getservice($2)) == -1)
392 				yyerror("invalid port number %s", $2);
393 			free($2);
394 		}
395 		| PORT NUM	{ $$ = $2; }
396 		;
397 
398 proxy_match	: PROTO string {
399 			(void) strlcpy(proxy->match_proto, $2, sizeof(proxy->match_proto));
400 			free($2);
401 		}
402 		| FOR_HOST string proxy_port {
403 			(void) strlcpy(proxy->match_host, $2, sizeof(proxy->match_host));
404 			(void) snprintf(proxy->match_port, sizeof(proxy->match_port),
405 			    "%d", $3);
406 			free($2);
407 		}
408 		;
409 
410 proxy_opts	: /* empty */
411 		| proxy_opts proxy_opt optnl
412 		;
413 
414 proxy_opt	: CERT string {
415 			free(proxy->cert);
416 			ensure_absolute_path($2);
417 			proxy->cert_path = $2;
418 		}
419 		| KEY string {
420 			free(proxy->key);
421 			ensure_absolute_path($2);
422 			proxy->key_path = $2;
423 		}
424 		| PROTOCOLS string {
425 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
426 				yyerror("invalid protocols string \"%s\"", $2);
427 			free($2);
428 		}
429 		| RELAY_TO string proxy_port {
430 			(void) strlcpy(proxy->host, $2, sizeof(proxy->host));
431 			(void) snprintf(proxy->port, sizeof(proxy->port),
432 			    "%d", $3);
433 			free($2);
434 		}
435 		| REQUIRE CLIENT CA string {
436 			ensure_absolute_path($4);
437 			proxy->reqca_path = $4;
438 		}
439 		| SNI string {
440 			(void) strlcpy(proxy->sni, $2, sizeof(proxy->sni));
441 			free($2);
442 		}
443 		| USE_TLS bool {
444 			proxy->notls = !$2;
445 		}
446 		| VERIFYNAME bool {
447 			proxy->noverifyname = !$2;
448 		}
449 		;
450 
451 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
452 			/* drop the starting '/' if any */
453 			if (*$3 == '/')
454 				memmove($3, $3+1, strlen($3));
455 			(void) strlcpy(loc->match, $3, sizeof(loc->match));
456 			free($3);
457 		}
458 		| error '}'
459 		;
460 
461 locopts		: /* empty */
462 		| locopts locopt optnl
463 		;
464 
465 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
466 		| BLOCK RETURN NUM string {
467 			check_block_fmt($4);
468 			(void) strlcpy(loc->block_fmt, $4, sizeof(loc->block_fmt));
469 			loc->block_code = check_block_code($3);
470 			free($4);
471 		}
472 		| BLOCK RETURN NUM {
473 			(void) strlcpy(loc->block_fmt, "temporary failure",
474 			    sizeof(loc->block_fmt));
475 			loc->block_code = check_block_code($3);
476 			if ($3 >= 30 && $3 < 40)
477 				yyerror("missing `meta' for block return %d", $3);
478 		}
479 		| BLOCK {
480 			(void) strlcpy(loc->block_fmt, "temporary failure",
481 			    sizeof(loc->block_fmt));
482 			loc->block_code = 40;
483 		}
484 		| DEFAULT TYPE string {
485 			(void) strlcpy(loc->default_mime, $3,
486 			    sizeof(loc->default_mime));
487 			free($3);
488 		}
489 		| fastcgi
490 		| INDEX string {
491 			(void) strlcpy(loc->index, $2, sizeof(loc->index));
492 			free($2);
493 		}
494 		| LANG string {
495 			(void) strlcpy(loc->lang, $2,
496 			    sizeof(loc->lang));
497 			free($2);
498 		}
499 		| LOG bool	{ loc->disable_log = !$2; }
500 		| REQUIRE CLIENT CA string {
501 			ensure_absolute_path($4);
502 			loc->reqca_path = $4;
503 		}
504 		| ROOT string		{
505 			(void) strlcpy(loc->dir, $2, sizeof(loc->dir));
506 			free($2);
507 		}
508 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
509 		;
510 
511 fastcgi		: FASTCGI '{' optnl fastcgiopts '}'
512 		| FASTCGI fastcgiopt
513 		| FASTCGI OFF {
514 			loc->fcgi = -1;
515 			loc->nofcgi = 1;
516 		}
517 		| FASTCGI string {
518 			yywarn("`fastcgi path' is deprecated.  "
519 			    "Please use `fastcgi socket path' instead.");
520 			loc->fcgi = fastcgi_conf($2, NULL);
521 			free($2);
522 		}
523 		;
524 
525 fastcgiopts	: /* empty */
526 		| fastcgiopts fastcgiopt optnl
527 		;
528 
529 fastcgiopt	: PARAM string '=' string {
530 			add_param($2, $4);
531 		}
532 		| SOCKET string {
533 			loc->fcgi = fastcgi_conf($2, NULL);
534 			free($2);
535 		}
536 		| SOCKET TCP string PORT NUM {
537 			char *c;
538 
539 			if (asprintf(&c, "%d", $5) == -1)
540 				fatal("asprintf");
541 			loc->fcgi = fastcgi_conf($3, c);
542 			free($3);
543 			free(c);
544 		}
545 		| SOCKET TCP string {
546 			loc->fcgi = fastcgi_conf($3, "9000");
547 		}
548 		| SOCKET TCP string PORT string {
549 			loc->fcgi = fastcgi_conf($3, $5);
550 			free($3);
551 			free($5);
552 		}
553 		;
554 
555 types		: TYPES '{' optnl mediaopts_l '}' ;
556 
557 mediaopts_l	: mediaopts_l mediaoptsl nl
558 		| mediaoptsl nl
559 		;
560 
561 mediaoptsl	: STRING {
562 			free(current_media);
563 			current_media = $1;
564 		} medianames_l optsemicolon
565 		| include
566 		;
567 
568 medianames_l	: medianames_l medianamesl
569 		| medianamesl
570 		;
571 
572 medianamesl	: numberstring {
573 			if (add_mime(&conf->mime, current_media, $1) == -1)
574 				fatal("add_mime");
575 			free($1);
576 		}
577 		;
578 
579 nl		: '\n' optnl
580 		;
581 
582 optnl		: '\n' optnl		/* zero or more newlines */
583 		| ';' optnl		/* semicolons too */
584 		| /*empty*/
585 		;
586 
587 optsemicolon	: ';'
588 		|
589 		;
590 
591 %%
592 
593 static const struct keyword {
594 	const char *word;
595 	int token;
596 } keywords[] = {
597 	/* these MUST be sorted */
598 	{"access", ACCESS},
599 	{"alias", ALIAS},
600 	{"auto", AUTO},
601 	{"block", BLOCK},
602 	{"ca", CA},
603 	{"cert", CERT},
604 	{"chroot", CHROOT},
605 	{"client", CLIENT},
606 	{"default", DEFAULT},
607 	{"fastcgi", FASTCGI},
608 	{"for-host", FOR_HOST},
609 	{"include", INCLUDE},
610 	{"index", INDEX},
611 	{"ipv6", IPV6},
612 	{"key", KEY},
613 	{"lang", LANG},
614 	{"listen", LISTEN},
615 	{"location", LOCATION},
616 	{"log", LOG},
617 	{"ocsp", OCSP},
618 	{"off", OFF},
619 	{"on", ON},
620 	{"param", PARAM},
621 	{"port", PORT},
622 	{"prefork", PREFORK},
623 	{"proto", PROTO},
624 	{"protocols", PROTOCOLS},
625 	{"proxy", PROXY},
626 	{"relay-to", RELAY_TO},
627 	{"require", REQUIRE},
628 	{"return", RETURN},
629 	{"root", ROOT},
630 	{"server", SERVER},
631 	{"sni", SNI},
632 	{"socket", SOCKET},
633 	{"strip", STRIP},
634 	{"syslog", SYSLOG},
635 	{"tcp", TCP},
636 	{"to-ext", TOEXT},
637 	{"type", TYPE},
638 	{"types", TYPES},
639 	{"use-tls", USE_TLS},
640 	{"user", USER},
641 	{"verifyname", VERIFYNAME},
642 };
643 
644 void
645 yyerror(const char *msg, ...)
646 {
647 	va_list ap;
648 
649 	file->errors++;
650 
651 	va_start(ap, msg);
652 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
653 	vfprintf(stderr, msg, ap);
654 	fprintf(stderr, "\n");
655 	va_end(ap);
656 }
657 
658 void
659 yywarn(const char *msg, ...)
660 {
661 	va_list ap;
662 
663 	va_start(ap, msg);
664 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
665 	vfprintf(stderr, msg, ap);
666 	fprintf(stderr, "\n");
667 	va_end(ap);
668 }
669 
670 int
671 kw_cmp(const void *k, const void *e)
672 {
673 	return strcmp(k, ((struct keyword *)e)->word);
674 }
675 
676 int
677 lookup(char *s)
678 {
679 	const struct keyword	*p;
680 
681 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
682 	    sizeof(keywords[0]), kw_cmp);
683 
684 	if (p)
685 		return p->token;
686 	else
687 		return STRING;
688 }
689 
690 #define START_EXPAND	1
691 #define DONE_EXPAND	2
692 
693 static int	expanding;
694 
695 int
696 igetc(void)
697 {
698 	int	c;
699 
700 	while (1) {
701 		if (file->ungetpos > 0)
702 			c = file->ungetbuf[--file->ungetpos];
703 		else
704 			c = getc(file->stream);
705 
706 		if (c == START_EXPAND)
707 			expanding = 1;
708 		else if (c == DONE_EXPAND)
709 			expanding = 0;
710 		else
711 			break;
712 	}
713 	return c;
714 }
715 
716 int
717 lgetc(int quotec)
718 {
719 	int		c, next;
720 
721 	if (quotec) {
722 		if ((c = igetc()) == EOF) {
723 			yyerror("reached end of file while parsing "
724 			    "quoted string");
725 			if (file == topfile || popfile() == EOF)
726 				return EOF;
727 			return quotec;
728 		}
729 		return c;
730 	}
731 
732 	while ((c = igetc()) == '\\') {
733 		next = igetc();
734 		if (next != '\n') {
735 			c = next;
736 			break;
737 		}
738 		yylval.lineno = file->lineno;
739 		file->lineno++;
740 	}
741 
742 	if (c == EOF) {
743 		/*
744 		 * Fake EOL when hit EOF for the first time. This gets line
745 		 * count right if last line in included file is syntactically
746 		 * invalid and has no newline.
747 		 */
748 		if (file->eof_reached == 0) {
749 			file->eof_reached = 1;
750 			return '\n';
751 		}
752 		while (c == EOF) {
753 			if (file == topfile || popfile() == EOF)
754 				return EOF;
755 			c = igetc();
756 		}
757 	}
758 	return c;
759 }
760 
761 void
762 lungetc(int c)
763 {
764 	if (c == EOF)
765 		return;
766 
767 	if (file->ungetpos >= file->ungetsize) {
768 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
769 		if (p == NULL)
770 			fatal("lungetc");
771 		file->ungetbuf = p;
772 		file->ungetsize *= 2;
773 	}
774 	file->ungetbuf[file->ungetpos++] = c;
775 }
776 
777 int
778 findeol(void)
779 {
780 	int	c;
781 
782 	/* Skip to either EOF or the first real EOL. */
783 	while (1) {
784 		c = lgetc(0);
785 		if (c == '\n') {
786 			file->lineno++;
787 			break;
788 		}
789 		if (c == EOF)
790 			break;
791 	}
792 	return ERROR;
793 }
794 
795 int
796 yylex(void)
797 {
798 	char	 buf[8096];
799 	char	*p, *val;
800 	int	 quotec, next, c;
801 	int	 token;
802 
803 top:
804 	p = buf;
805 	while ((c = lgetc(0)) == ' ' || c == '\t')
806 		; /* nothing */
807 
808 	yylval.lineno = file->lineno;
809 	if (c == '#')
810 		while ((c = lgetc(0)) != '\n' && c != EOF)
811 			; /* nothing */
812 	if (c == '$' && !expanding) {
813 		while (1) {
814 			if ((c = lgetc(0)) == EOF)
815 				return 0;
816 			if (p + 1 >= buf + sizeof(buf) -1) {
817 				yyerror("string too long");
818 				return findeol();
819 			}
820 			if (isalnum(c) || c == '_') {
821 				*p++ = c;
822 				continue;
823 			}
824 			*p = '\0';
825 			lungetc(c);
826 			break;
827 		}
828 		val = symget(buf);
829 		if (val == NULL) {
830 			yyerror("macro `%s' not defined", buf);
831 			return findeol();
832 		}
833 		yylval.v.string = xstrdup(val);
834 		return STRING;
835 	}
836 	if (c == '@' && !expanding) {
837 		while (1) {
838 			if ((c = lgetc(0)) == EOF)
839 				return 0;
840 
841 			if (p + 1 >= buf + sizeof(buf) - 1) {
842 				yyerror("string too long");
843 				return findeol();
844 			}
845 			if (isalnum(c) || c == '_') {
846 				*p++ = c;
847 				continue;
848 			}
849 			*p = '\0';
850 			lungetc(c);
851 			break;
852 		}
853 		val = symget(buf);
854 		if (val == NULL) {
855 			yyerror("macro '%s' not defined", buf);
856 			return findeol();
857 		}
858 		p = val + strlen(val) - 1;
859 		lungetc(DONE_EXPAND);
860 		while (p >= val) {
861 			lungetc(*p);
862 			p--;
863 		}
864 		lungetc(START_EXPAND);
865 		goto top;
866 	}
867 
868 	switch (c) {
869 	case '\'':
870 	case '"':
871 		quotec = c;
872 		while (1) {
873 			if ((c = lgetc(quotec)) == EOF)
874 				return 0;
875 			if (c == '\n') {
876 				file->lineno++;
877 				continue;
878 			} else if (c == '\\') {
879 				if ((next = lgetc(quotec)) == EOF)
880 					return (0);
881 				if (next == quotec || next == ' ' ||
882 				    next == '\t')
883 					c = next;
884 				else if (next == '\n') {
885 					file->lineno++;
886 					continue;
887 				} else
888 					lungetc(next);
889 			} else if (c == quotec) {
890 				*p = '\0';
891 				break;
892 			} else if (c == '\0') {
893 				yyerror("invalid syntax");
894 				return findeol();
895 			}
896 			if (p + 1 >= buf + sizeof(buf) - 1) {
897 				yyerror("string too long");
898 				return findeol();
899 			}
900 			*p++ = c;
901 		}
902 		yylval.v.string = strdup(buf);
903 		if (yylval.v.string == NULL)
904 			fatal("yylex: strdup");
905 		return STRING;
906 	}
907 
908 #define allowed_to_end_number(x) \
909 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
910 
911 	if (c == '-' || isdigit(c)) {
912 		do {
913 			*p++ = c;
914 			if ((size_t)(p-buf) >= sizeof(buf)) {
915 				yyerror("string too long");
916 				return findeol();
917 			}
918 		} while ((c = lgetc(0)) != EOF && isdigit(c));
919 		lungetc(c);
920 		if (p == buf + 1 && buf[0] == '-')
921 			goto nodigits;
922 		if (c == EOF || allowed_to_end_number(c)) {
923 			const char *errstr = NULL;
924 
925 			*p = '\0';
926 			yylval.v.number = strtonum(buf, LLONG_MIN,
927 			    LLONG_MAX, &errstr);
928 			if (errstr) {
929 				yyerror("\"%s\" invalid number: %s",
930 				    buf, errstr);
931 				return findeol();
932 			}
933 			return NUM;
934 		} else {
935 nodigits:
936 			while (p > buf + 1)
937 				lungetc(*--p);
938 			c = *--p;
939 			if (c == '-')
940 				return c;
941 		}
942 	}
943 
944 #define allowed_in_string(x) \
945 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
946 	x != '{' && x != '}' && \
947 	x != '!' && x != '=' && x != '#' && \
948 	x != ',' && x != ';'))
949 
950 	if (isalnum(c) || c == ':' || c == '_') {
951 		do {
952 			*p++ = c;
953 			if ((size_t)(p-buf) >= sizeof(buf)) {
954 				yyerror("string too long");
955 				return findeol();
956 			}
957 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
958 		lungetc(c);
959 		*p = '\0';
960 		if ((token = lookup(buf)) == STRING)
961 			yylval.v.string = xstrdup(buf);
962 		return token;
963 	}
964 	if (c == '\n') {
965 		yylval.lineno = file->lineno;
966 		file->lineno++;
967 	}
968 	if (c == EOF)
969 		return 0;
970 	return c;
971 }
972 
973 struct file *
974 pushfile(const char *name, int secret)
975 {
976 	struct file	*nfile;
977 
978 	nfile = xcalloc(1, sizeof(*nfile));
979 	nfile->name = xstrdup(name);
980 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
981 		log_warn("can't open %s", nfile->name);
982 		free(nfile->name);
983 		free(nfile);
984 		return NULL;
985 	}
986 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
987 	nfile->ungetsize = 16;
988 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
989 	TAILQ_INSERT_TAIL(&files, nfile, entry);
990 	return nfile;
991 }
992 
993 int
994 popfile(void)
995 {
996 	struct file	*prev;
997 
998 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
999 		prev->errors += file->errors;
1000 
1001 	TAILQ_REMOVE(&files, file, entry);
1002 	fclose(file->stream);
1003 	free(file->name);
1004 	free(file->ungetbuf);
1005 	free(file);
1006 	file = prev;
1007 	return file ? 0 : EOF;
1008 }
1009 
1010 int
1011 parse_conf(struct conf *c, const char *filename)
1012 {
1013 	struct sym		*sym, *next;
1014 
1015 	default_host = "*";
1016 	default_port = 1965;
1017 
1018 	conf = c;
1019 
1020 	file = pushfile(filename, 0);
1021 	if (file == NULL)
1022 		return -1;
1023 	topfile = file;
1024 
1025 	yyparse();
1026 	errors = file->errors;
1027 	popfile();
1028 
1029 	/* Free macros and check which have not been used. */
1030 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
1031 		/* TODO: warn if !sym->used */
1032 		if (!sym->persist) {
1033 			free(sym->name);
1034 			free(sym->val);
1035 			TAILQ_REMOVE(&symhead, sym, entry);
1036 			free(sym);
1037 		}
1038 	}
1039 
1040 	if (errors)
1041 		return -1;
1042 	return 0;
1043 }
1044 
1045 int
1046 symset(const char *name, const char *val, int persist)
1047 {
1048 	struct sym *sym;
1049 
1050 	TAILQ_FOREACH(sym, &symhead, entry) {
1051 		if (!strcmp(name, sym->name))
1052 			break;
1053 	}
1054 
1055 	if (sym != NULL) {
1056 		if (sym->persist)
1057 			return 0;
1058 		else {
1059 			free(sym->name);
1060 			free(sym->val);
1061 			TAILQ_REMOVE(&symhead, sym, entry);
1062 			free(sym);
1063 		}
1064 	}
1065 
1066 	sym = xcalloc(1, sizeof(*sym));
1067 	sym->name = xstrdup(name);
1068 	sym->val = xstrdup(val);
1069 	sym->used = 0;
1070 	sym->persist = persist;
1071 
1072 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1073 	return 0;
1074 }
1075 
1076 int
1077 cmdline_symset(char *s)
1078 {
1079 	char	*sym, *val;
1080 	int	 ret;
1081 
1082 	if ((val = strrchr(s, '=')) == NULL)
1083 		return -1;
1084 	sym = xcalloc(1, val - s + 1);
1085 	memcpy(sym, s, val - s);
1086 	ret = symset(sym, val + 1, 1);
1087 	free(sym);
1088 	return ret;
1089 }
1090 
1091 char *
1092 symget(const char *nam)
1093 {
1094 	struct sym	*sym;
1095 
1096 	TAILQ_FOREACH(sym, &symhead, entry) {
1097 		if (strcmp(nam, sym->name) == 0) {
1098 			sym->used = 1;
1099 			return sym->val;
1100 		}
1101 	}
1102 	return NULL;
1103 }
1104 
1105 char *
1106 ensure_absolute_path(char *path)
1107 {
1108 	if (path == NULL || *path != '/')
1109 		yyerror("not an absolute path: %s", path);
1110 	return path;
1111 }
1112 
1113 int
1114 check_block_code(int n)
1115 {
1116 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1117 		yyerror("invalid block code %d", n);
1118 	return n;
1119 }
1120 
1121 char *
1122 check_block_fmt(char *fmt)
1123 {
1124 	char *s;
1125 
1126 	for (s = fmt; *s; ++s) {
1127 		if (*s != '%')
1128 			continue;
1129 		switch (*++s) {
1130 		case '%':
1131 		case 'p':
1132 		case 'q':
1133 		case 'P':
1134 		case 'N':
1135 			break;
1136 		default:
1137 			yyerror("invalid format specifier %%%c", *s);
1138 		}
1139 	}
1140 
1141 	return fmt;
1142 }
1143 
1144 int
1145 check_strip_no(int n)
1146 {
1147 	if (n <= 0)
1148 		yyerror("invalid strip number %d", n);
1149 	return n;
1150 }
1151 
1152 int
1153 check_port_num(int n)
1154 {
1155 	if (n <= 0 || n >= UINT16_MAX)
1156 		yyerror("port number is %s: %d",
1157 		    n <= 0 ? "too small" : "too large",
1158 		    n);
1159 	return n;
1160 }
1161 
1162 int
1163 check_prefork_num(int n)
1164 {
1165 	if (n <= 0 || n >= PROC_MAX_INSTANCES)
1166 		yyerror("invalid prefork number %d", n);
1167 	return n;
1168 }
1169 
1170 void
1171 advance_loc(void)
1172 {
1173 	loc = new_location();
1174 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1175 }
1176 
1177 void
1178 advance_proxy(void)
1179 {
1180 	proxy = new_proxy();
1181 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1182 }
1183 
1184 void
1185 parsehp(char *str, char **host, const char **port, const char *def)
1186 {
1187 	char		*at;
1188 	const char	*errstr;
1189 
1190 	*host = str;
1191 
1192 	if ((at = strchr(str, ':')) != NULL) {
1193 		*at++ = '\0';
1194 		*port = at;
1195 	} else
1196 		*port = def;
1197 
1198 	strtonum(*port, 1, UINT16_MAX, &errstr);
1199 	if (errstr != NULL)
1200 		yyerror("port is %s: %s", errstr, *port);
1201 }
1202 
1203 int
1204 fastcgi_conf(const char *path, const char *port)
1205 {
1206 	struct fcgi	*f;
1207 	int		i = 0;
1208 
1209 	TAILQ_FOREACH(f, &conf->fcgi, fcgi) {
1210 		if (!strcmp(f->path, path) &&
1211 		    ((port == NULL && *f->port == '\0') ||
1212 		     !strcmp(f->port, port)))
1213 			return i;
1214 		++i;
1215 	}
1216 
1217 	f = xcalloc(1, sizeof(*f));
1218 	f->id = i;
1219 	(void)strlcpy(f->path, path, sizeof(f->path));
1220 	if (port != NULL)
1221 		(void)strlcpy(f->port, port, sizeof(f->port));
1222 	TAILQ_INSERT_TAIL(&conf->fcgi, f, fcgi);
1223 
1224 	return f->id;
1225 }
1226 
1227 void
1228 add_param(char *name, char *val)
1229 {
1230 	struct envlist *e;
1231 	struct envhead *h = &loc->params;
1232 
1233 	e = xcalloc(1, sizeof(*e));
1234 	(void) strlcpy(e->name, name, sizeof(e->name));
1235 	(void) strlcpy(e->value, val, sizeof(e->value));
1236 	TAILQ_INSERT_TAIL(h, e, envs);
1237 }
1238 
1239 int
1240 getservice(const char *n)
1241 {
1242 	struct servent	*s;
1243 	const char	*errstr;
1244 	long long	 llval;
1245 
1246 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1247 	if (errstr) {
1248 		s = getservbyname(n, "tcp");
1249 		if (s == NULL)
1250 			s = getservbyname(n, "udp");
1251 		if (s == NULL)
1252 			return (-1);
1253 		return (ntohs(s->s_port));
1254 	}
1255 
1256 	return ((unsigned short)llval);
1257 }
1258 
1259 static void
1260 add_to_addr_queue(struct addrhead *a, struct addrinfo *ai)
1261 {
1262 	struct address		*addr;
1263 	struct sockaddr_in	*sin;
1264 	struct sockaddr_in6	*sin6;
1265 
1266 	if (ai->ai_addrlen > sizeof(addr->ss))
1267 		fatalx("ai_addrlen larger than a sockaddr_storage");
1268 
1269 	TAILQ_FOREACH(addr, a, addrs) {
1270 		if (addr->ai_flags == ai->ai_flags &&
1271 		    addr->ai_family == ai->ai_family &&
1272 		    addr->ai_socktype == ai->ai_socktype &&
1273 		    addr->ai_protocol == ai->ai_protocol &&
1274 		    addr->slen == ai->ai_addrlen &&
1275 		    !memcmp(&addr->ss, ai->ai_addr, addr->slen))
1276 			return;
1277 	}
1278 
1279 	addr = xcalloc(1, sizeof(*addr));
1280 	addr->ai_flags = ai->ai_flags;
1281 	addr->ai_family = ai->ai_family;
1282 	addr->ai_socktype = ai->ai_socktype;
1283 	addr->ai_protocol = ai->ai_protocol;
1284 	addr->slen = ai->ai_addrlen;
1285 	memcpy(&addr->ss, ai->ai_addr, ai->ai_addrlen);
1286 
1287 	/* for commodity */
1288 	switch (addr->ai_family) {
1289 	case AF_INET:
1290 		sin = (struct sockaddr_in *)&addr->ss;
1291 		addr->port = ntohs(sin->sin_port);
1292 		break;
1293 	case AF_INET6:
1294 		sin6 = (struct sockaddr_in6 *)&addr->ss;
1295 		addr->port = ntohs(sin6->sin6_port);
1296 		break;
1297 	default:
1298 		fatalx("unknown socket family %d", addr->ai_family);
1299 	}
1300 
1301 	addr->sock = -1;
1302 
1303 	TAILQ_INSERT_HEAD(a, addr, addrs);
1304 }
1305 
1306 void
1307 listen_on(const char *hostname, const char *servname)
1308 {
1309 	struct addrinfo hints, *res, *res0;
1310 	int error;
1311 
1312 	memset(&hints, 0, sizeof(hints));
1313 	hints.ai_family = AF_UNSPEC;
1314 	hints.ai_socktype = SOCK_STREAM;
1315 	hints.ai_flags = AI_PASSIVE;
1316 	error = getaddrinfo(hostname, servname, &hints, &res0);
1317 	if (error) {
1318 		yyerror("listen on \"%s\" port %s: %s", hostname, servname,
1319 		    gai_strerror(errno));
1320 		return;
1321 	}
1322 
1323 	for (res = res0; res; res = res->ai_next) {
1324 		add_to_addr_queue(&host->addrs, res);
1325 		add_to_addr_queue(&conf->addrs, res);
1326 	}
1327 
1328 	freeaddrinfo(res0);
1329 }