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 COMBINED COMMON CONDENSED
128 %token	DEFAULT
129 %token	FASTCGI FOR_HOST
130 %token	INCLUDE INDEX IPV6
131 %token	KEY
132 %token	LANG LEGACY 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 STYLE 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 		| STYLE COMMON		{
272 			conf->log_format = LOG_FORMAT_COMMON;
273 		}
274 		| STYLE COMBINED	{
275 			conf->log_format = LOG_FORMAT_COMBINED;
276 		}
277 		| STYLE CONDENSED	{
278 			conf->log_format = LOG_FORMAT_CONDENSED;
279 		}
280 		| STILE LEGACY		{
281 			conf->log_format = LOG_FORMAT_LEGACY;
282 		}
283 		;
284 
285 vhost		: SERVER string {
286 			host = new_vhost();
287 			TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
288 
289 			loc = new_location();
290 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
291 
292 			TAILQ_INIT(&host->proxies);
293 
294 			(void) strlcpy(loc->match, "*", sizeof(loc->match));
295 			(void) strlcpy(host->domain, $2, sizeof(host->domain));
296 
297 			if (strstr($2, "xn--") != NULL) {
298 				yywarn("\"%s\" looks like punycode: you "
299 				    "should use the decoded hostname", $2);
300 			}
301 
302 			free($2);
303 		} '{' optnl servbody '}' {
304 			if (host->cert_path == NULL ||
305 			    host->key_path == NULL)
306 				yyerror("invalid vhost definition: %s",
307 				    host->domain);
308 			if (TAILQ_EMPTY(&host->addrs)) {
309 				char portno[32];
310 				int r;
311 
312 				r = snprintf(portno, sizeof(portno), "%d",
313 				    default_port);
314 				if (r < 0 || (size_t)r >= sizeof(portno))
315 					fatal("snprintf");
316 
317 				yywarn("missing `listen on' in server %s,"
318 				    " assuming %s port %d", $2, default_host,
319 				    default_port);
320 				listen_on(default_host, portno);
321 			}
322 		}
323 		| error '}'		{ yyerror("bad server directive"); }
324 		;
325 
326 servbody	: /* empty */
327 		| servbody servopt optnl
328 		| servbody location optnl
329 		| servbody proxy optnl
330 		;
331 
332 listen_addr	: '*' { $$ = NULL; }
333 		| STRING
334 		;
335 
336 servopt		: ALIAS string {
337 			struct alist *a;
338 
339 			a = xcalloc(1, sizeof(*a));
340 			(void) strlcpy(a->alias, $2, sizeof(a->alias));
341 			free($2);
342 			TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
343 		}
344 		| CERT string		{
345 			ensure_absolute_path($2);
346 			free(host->cert_path);
347 			host->cert_path = $2;
348 		}
349 		| KEY string		{
350 			ensure_absolute_path($2);
351 			free(host->key_path);
352 			host->key_path = $2;
353 		}
354 		| OCSP string		{
355 			ensure_absolute_path($2);
356 			free(host->ocsp_path);
357 			host->ocsp_path = $2;
358 		}
359 		| PARAM string '=' string {
360 			yywarn("the top-level `param' directive is deprecated."
361 			    "  Please use `fastcgi { param ... }`");
362 			add_param($2, $4);
363 		}
364 		| LISTEN ON listen_addr {
365 			listen_on($3, "1965");
366 		}
367 		| LISTEN ON listen_addr PORT STRING {
368 			listen_on($3, $5);
369 			free($3);
370 			free($5);
371 		}
372 		| LISTEN ON listen_addr PORT NUM {
373 			char portno[32];
374 			int r;
375 
376 			r = snprintf(portno, sizeof(portno), "%d", $5);
377 			if (r < 0 || (size_t)r >= sizeof(portno))
378 				fatal("snprintf");
379 
380 			listen_on($3, portno);
381 			free($3);
382 		}
383 		| locopt
384 		;
385 
386 proxy		: PROXY { advance_proxy(); }
387 		  proxy_matches '{' optnl proxy_opts '}' {
388 			if (*proxy->host == '\0')
389 				yyerror("invalid proxy block: missing `relay-to' option");
390 
391 			if ((proxy->cert_path == NULL && proxy->key_path != NULL) ||
392 			    (proxy->cert_path != NULL && proxy->key_path == NULL))
393 				yyerror("invalid proxy block: missing cert or key");
394 		}
395 		;
396 
397 proxy_matches	: /* empty */
398 		| proxy_matches proxy_match
399 		;
400 
401 proxy_port	: /* empty */	{ $$ = 1965; }
402 		| PORT STRING {
403 			if (($$ = getservice($2)) == -1)
404 				yyerror("invalid port number %s", $2);
405 			free($2);
406 		}
407 		| PORT NUM	{ $$ = $2; }
408 		;
409 
410 proxy_match	: PROTO string {
411 			(void) strlcpy(proxy->match_proto, $2, sizeof(proxy->match_proto));
412 			free($2);
413 		}
414 		| FOR_HOST string proxy_port {
415 			(void) strlcpy(proxy->match_host, $2, sizeof(proxy->match_host));
416 			(void) snprintf(proxy->match_port, sizeof(proxy->match_port),
417 			    "%d", $3);
418 			free($2);
419 		}
420 		;
421 
422 proxy_opts	: /* empty */
423 		| proxy_opts proxy_opt optnl
424 		;
425 
426 proxy_opt	: CERT string {
427 			free(proxy->cert);
428 			ensure_absolute_path($2);
429 			proxy->cert_path = $2;
430 		}
431 		| KEY string {
432 			free(proxy->key);
433 			ensure_absolute_path($2);
434 			proxy->key_path = $2;
435 		}
436 		| PROTOCOLS string {
437 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
438 				yyerror("invalid protocols string \"%s\"", $2);
439 			free($2);
440 		}
441 		| RELAY_TO string proxy_port {
442 			(void) strlcpy(proxy->host, $2, sizeof(proxy->host));
443 			(void) snprintf(proxy->port, sizeof(proxy->port),
444 			    "%d", $3);
445 			free($2);
446 		}
447 		| REQUIRE CLIENT CA string {
448 			ensure_absolute_path($4);
449 			proxy->reqca_path = $4;
450 		}
451 		| SNI string {
452 			(void) strlcpy(proxy->sni, $2, sizeof(proxy->sni));
453 			free($2);
454 		}
455 		| USE_TLS bool {
456 			proxy->notls = !$2;
457 		}
458 		| VERIFYNAME bool {
459 			proxy->noverifyname = !$2;
460 		}
461 		;
462 
463 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
464 			/* drop the starting '/' if any */
465 			if (*$3 == '/')
466 				memmove($3, $3+1, strlen($3));
467 			(void) strlcpy(loc->match, $3, sizeof(loc->match));
468 			free($3);
469 		}
470 		| error '}'
471 		;
472 
473 locopts		: /* empty */
474 		| locopts locopt optnl
475 		;
476 
477 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
478 		| BLOCK RETURN NUM string {
479 			check_block_fmt($4);
480 			(void) strlcpy(loc->block_fmt, $4, sizeof(loc->block_fmt));
481 			loc->block_code = check_block_code($3);
482 			free($4);
483 		}
484 		| BLOCK RETURN NUM {
485 			(void) strlcpy(loc->block_fmt, "temporary failure",
486 			    sizeof(loc->block_fmt));
487 			loc->block_code = check_block_code($3);
488 			if ($3 >= 30 && $3 < 40)
489 				yyerror("missing `meta' for block return %d", $3);
490 		}
491 		| BLOCK {
492 			(void) strlcpy(loc->block_fmt, "temporary failure",
493 			    sizeof(loc->block_fmt));
494 			loc->block_code = 40;
495 		}
496 		| DEFAULT TYPE string {
497 			(void) strlcpy(loc->default_mime, $3,
498 			    sizeof(loc->default_mime));
499 			free($3);
500 		}
501 		| fastcgi
502 		| INDEX string {
503 			(void) strlcpy(loc->index, $2, sizeof(loc->index));
504 			free($2);
505 		}
506 		| LANG string {
507 			(void) strlcpy(loc->lang, $2,
508 			    sizeof(loc->lang));
509 			free($2);
510 		}
511 		| LOG bool	{ loc->disable_log = !$2; }
512 		| REQUIRE CLIENT CA string {
513 			ensure_absolute_path($4);
514 			loc->reqca_path = $4;
515 		}
516 		| ROOT string		{
517 			(void) strlcpy(loc->dir, $2, sizeof(loc->dir));
518 			free($2);
519 		}
520 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
521 		;
522 
523 fastcgi		: FASTCGI '{' optnl fastcgiopts '}'
524 		| FASTCGI fastcgiopt
525 		| FASTCGI OFF {
526 			loc->fcgi = -1;
527 			loc->nofcgi = 1;
528 		}
529 		| FASTCGI string {
530 			yywarn("`fastcgi path' is deprecated.  "
531 			    "Please use `fastcgi socket path' instead.");
532 			loc->fcgi = fastcgi_conf($2, NULL);
533 			free($2);
534 		}
535 		;
536 
537 fastcgiopts	: /* empty */
538 		| fastcgiopts fastcgiopt optnl
539 		;
540 
541 fastcgiopt	: PARAM string '=' string {
542 			add_param($2, $4);
543 		}
544 		| SOCKET string {
545 			loc->fcgi = fastcgi_conf($2, NULL);
546 			free($2);
547 		}
548 		| SOCKET TCP string PORT NUM {
549 			char *c;
550 
551 			if (asprintf(&c, "%d", $5) == -1)
552 				fatal("asprintf");
553 			loc->fcgi = fastcgi_conf($3, c);
554 			free($3);
555 			free(c);
556 		}
557 		| SOCKET TCP string {
558 			loc->fcgi = fastcgi_conf($3, "9000");
559 		}
560 		| SOCKET TCP string PORT string {
561 			loc->fcgi = fastcgi_conf($3, $5);
562 			free($3);
563 			free($5);
564 		}
565 		;
566 
567 types		: TYPES '{' optnl mediaopts_l '}' ;
568 
569 mediaopts_l	: mediaopts_l mediaoptsl nl
570 		| mediaoptsl nl
571 		;
572 
573 mediaoptsl	: STRING {
574 			free(current_media);
575 			current_media = $1;
576 		} medianames_l optsemicolon
577 		| include
578 		;
579 
580 medianames_l	: medianames_l medianamesl
581 		| medianamesl
582 		;
583 
584 medianamesl	: numberstring {
585 			if (add_mime(&conf->mime, current_media, $1) == -1)
586 				fatal("add_mime");
587 			free($1);
588 		}
589 		;
590 
591 nl		: '\n' optnl
592 		;
593 
594 optnl		: '\n' optnl		/* zero or more newlines */
595 		| ';' optnl		/* semicolons too */
596 		| /*empty*/
597 		;
598 
599 optsemicolon	: ';'
600 		|
601 		;
602 
603 %%
604 
605 static const struct keyword {
606 	const char *word;
607 	int token;
608 } keywords[] = {
609 	/* these MUST be sorted */
610 	{"access", ACCESS},
611 	{"alias", ALIAS},
612 	{"auto", AUTO},
613 	{"block", BLOCK},
614 	{"ca", CA},
615 	{"cert", CERT},
616 	{"chroot", CHROOT},
617 	{"client", CLIENT},
618 	{"combined", COMBINED},
619 	{"common", COMMON},
620 	{"condensed", CONDENSED},
621 	{"default", DEFAULT},
622 	{"fastcgi", FASTCGI},
623 	{"for-host", FOR_HOST},
624 	{"include", INCLUDE},
625 	{"index", INDEX},
626 	{"ipv6", IPV6},
627 	{"key", KEY},
628 	{"lang", LANG},
629 	{"legacy", LEGACY},
630 	{"listen", LISTEN},
631 	{"location", LOCATION},
632 	{"log", LOG},
633 	{"ocsp", OCSP},
634 	{"off", OFF},
635 	{"on", ON},
636 	{"param", PARAM},
637 	{"port", PORT},
638 	{"prefork", PREFORK},
639 	{"proto", PROTO},
640 	{"protocols", PROTOCOLS},
641 	{"proxy", PROXY},
642 	{"relay-to", RELAY_TO},
643 	{"require", REQUIRE},
644 	{"return", RETURN},
645 	{"root", ROOT},
646 	{"server", SERVER},
647 	{"sni", SNI},
648 	{"socket", SOCKET},
649 	{"strip", STRIP},
650 	{"style", STYLE},
651 	{"syslog", SYSLOG},
652 	{"tcp", TCP},
653 	{"to-ext", TOEXT},
654 	{"type", TYPE},
655 	{"types", TYPES},
656 	{"use-tls", USE_TLS},
657 	{"user", USER},
658 	{"verifyname", VERIFYNAME},
659 };
660 
661 void
662 yyerror(const char *msg, ...)
663 {
664 	va_list ap;
665 
666 	file->errors++;
667 
668 	va_start(ap, msg);
669 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
670 	vfprintf(stderr, msg, ap);
671 	fprintf(stderr, "\n");
672 	va_end(ap);
673 }
674 
675 void
676 yywarn(const char *msg, ...)
677 {
678 	va_list ap;
679 
680 	va_start(ap, msg);
681 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
682 	vfprintf(stderr, msg, ap);
683 	fprintf(stderr, "\n");
684 	va_end(ap);
685 }
686 
687 int
688 kw_cmp(const void *k, const void *e)
689 {
690 	return strcmp(k, ((struct keyword *)e)->word);
691 }
692 
693 int
694 lookup(char *s)
695 {
696 	const struct keyword	*p;
697 
698 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
699 	    sizeof(keywords[0]), kw_cmp);
700 
701 	if (p)
702 		return p->token;
703 	else
704 		return STRING;
705 }
706 
707 #define START_EXPAND	1
708 #define DONE_EXPAND	2
709 
710 static int	expanding;
711 
712 int
713 igetc(void)
714 {
715 	int	c;
716 
717 	while (1) {
718 		if (file->ungetpos > 0)
719 			c = file->ungetbuf[--file->ungetpos];
720 		else
721 			c = getc(file->stream);
722 
723 		if (c == START_EXPAND)
724 			expanding = 1;
725 		else if (c == DONE_EXPAND)
726 			expanding = 0;
727 		else
728 			break;
729 	}
730 	return c;
731 }
732 
733 int
734 lgetc(int quotec)
735 {
736 	int		c, next;
737 
738 	if (quotec) {
739 		if ((c = igetc()) == EOF) {
740 			yyerror("reached end of file while parsing "
741 			    "quoted string");
742 			if (file == topfile || popfile() == EOF)
743 				return EOF;
744 			return quotec;
745 		}
746 		return c;
747 	}
748 
749 	while ((c = igetc()) == '\\') {
750 		next = igetc();
751 		if (next != '\n') {
752 			c = next;
753 			break;
754 		}
755 		yylval.lineno = file->lineno;
756 		file->lineno++;
757 	}
758 
759 	if (c == EOF) {
760 		/*
761 		 * Fake EOL when hit EOF for the first time. This gets line
762 		 * count right if last line in included file is syntactically
763 		 * invalid and has no newline.
764 		 */
765 		if (file->eof_reached == 0) {
766 			file->eof_reached = 1;
767 			return '\n';
768 		}
769 		while (c == EOF) {
770 			if (file == topfile || popfile() == EOF)
771 				return EOF;
772 			c = igetc();
773 		}
774 	}
775 	return c;
776 }
777 
778 void
779 lungetc(int c)
780 {
781 	if (c == EOF)
782 		return;
783 
784 	if (file->ungetpos >= file->ungetsize) {
785 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
786 		if (p == NULL)
787 			fatal("lungetc");
788 		file->ungetbuf = p;
789 		file->ungetsize *= 2;
790 	}
791 	file->ungetbuf[file->ungetpos++] = c;
792 }
793 
794 int
795 findeol(void)
796 {
797 	int	c;
798 
799 	/* Skip to either EOF or the first real EOL. */
800 	while (1) {
801 		c = lgetc(0);
802 		if (c == '\n') {
803 			file->lineno++;
804 			break;
805 		}
806 		if (c == EOF)
807 			break;
808 	}
809 	return ERROR;
810 }
811 
812 int
813 yylex(void)
814 {
815 	char	 buf[8096];
816 	char	*p, *val;
817 	int	 quotec, next, c;
818 	int	 token;
819 
820 top:
821 	p = buf;
822 	while ((c = lgetc(0)) == ' ' || c == '\t')
823 		; /* nothing */
824 
825 	yylval.lineno = file->lineno;
826 	if (c == '#')
827 		while ((c = lgetc(0)) != '\n' && c != EOF)
828 			; /* nothing */
829 	if (c == '$' && !expanding) {
830 		while (1) {
831 			if ((c = lgetc(0)) == EOF)
832 				return 0;
833 			if (p + 1 >= buf + sizeof(buf) -1) {
834 				yyerror("string too long");
835 				return findeol();
836 			}
837 			if (isalnum(c) || c == '_') {
838 				*p++ = c;
839 				continue;
840 			}
841 			*p = '\0';
842 			lungetc(c);
843 			break;
844 		}
845 		val = symget(buf);
846 		if (val == NULL) {
847 			yyerror("macro `%s' not defined", buf);
848 			return findeol();
849 		}
850 		yylval.v.string = xstrdup(val);
851 		return STRING;
852 	}
853 	if (c == '@' && !expanding) {
854 		while (1) {
855 			if ((c = lgetc(0)) == EOF)
856 				return 0;
857 
858 			if (p + 1 >= buf + sizeof(buf) - 1) {
859 				yyerror("string too long");
860 				return findeol();
861 			}
862 			if (isalnum(c) || c == '_') {
863 				*p++ = c;
864 				continue;
865 			}
866 			*p = '\0';
867 			lungetc(c);
868 			break;
869 		}
870 		val = symget(buf);
871 		if (val == NULL) {
872 			yyerror("macro '%s' not defined", buf);
873 			return findeol();
874 		}
875 		p = val + strlen(val) - 1;
876 		lungetc(DONE_EXPAND);
877 		while (p >= val) {
878 			lungetc(*p);
879 			p--;
880 		}
881 		lungetc(START_EXPAND);
882 		goto top;
883 	}
884 
885 	switch (c) {
886 	case '\'':
887 	case '"':
888 		quotec = c;
889 		while (1) {
890 			if ((c = lgetc(quotec)) == EOF)
891 				return 0;
892 			if (c == '\n') {
893 				file->lineno++;
894 				continue;
895 			} else if (c == '\\') {
896 				if ((next = lgetc(quotec)) == EOF)
897 					return (0);
898 				if (next == quotec || next == ' ' ||
899 				    next == '\t')
900 					c = next;
901 				else if (next == '\n') {
902 					file->lineno++;
903 					continue;
904 				} else
905 					lungetc(next);
906 			} else if (c == quotec) {
907 				*p = '\0';
908 				break;
909 			} else if (c == '\0') {
910 				yyerror("invalid syntax");
911 				return findeol();
912 			}
913 			if (p + 1 >= buf + sizeof(buf) - 1) {
914 				yyerror("string too long");
915 				return findeol();
916 			}
917 			*p++ = c;
918 		}
919 		yylval.v.string = strdup(buf);
920 		if (yylval.v.string == NULL)
921 			fatal("yylex: strdup");
922 		return STRING;
923 	}
924 
925 #define allowed_to_end_number(x) \
926 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
927 
928 	if (c == '-' || isdigit(c)) {
929 		do {
930 			*p++ = c;
931 			if ((size_t)(p-buf) >= sizeof(buf)) {
932 				yyerror("string too long");
933 				return findeol();
934 			}
935 		} while ((c = lgetc(0)) != EOF && isdigit(c));
936 		lungetc(c);
937 		if (p == buf + 1 && buf[0] == '-')
938 			goto nodigits;
939 		if (c == EOF || allowed_to_end_number(c)) {
940 			const char *errstr = NULL;
941 
942 			*p = '\0';
943 			yylval.v.number = strtonum(buf, LLONG_MIN,
944 			    LLONG_MAX, &errstr);
945 			if (errstr) {
946 				yyerror("\"%s\" invalid number: %s",
947 				    buf, errstr);
948 				return findeol();
949 			}
950 			return NUM;
951 		} else {
952 nodigits:
953 			while (p > buf + 1)
954 				lungetc(*--p);
955 			c = *--p;
956 			if (c == '-')
957 				return c;
958 		}
959 	}
960 
961 #define allowed_in_string(x) \
962 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
963 	x != '{' && x != '}' && \
964 	x != '!' && x != '=' && x != '#' && \
965 	x != ',' && x != ';'))
966 
967 	if (isalnum(c) || c == ':' || c == '_') {
968 		do {
969 			*p++ = c;
970 			if ((size_t)(p-buf) >= sizeof(buf)) {
971 				yyerror("string too long");
972 				return findeol();
973 			}
974 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
975 		lungetc(c);
976 		*p = '\0';
977 		if ((token = lookup(buf)) == STRING)
978 			yylval.v.string = xstrdup(buf);
979 		return token;
980 	}
981 	if (c == '\n') {
982 		yylval.lineno = file->lineno;
983 		file->lineno++;
984 	}
985 	if (c == EOF)
986 		return 0;
987 	return c;
988 }
989 
990 struct file *
991 pushfile(const char *name, int secret)
992 {
993 	struct file	*nfile;
994 
995 	nfile = xcalloc(1, sizeof(*nfile));
996 	nfile->name = xstrdup(name);
997 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
998 		log_warn("can't open %s", nfile->name);
999 		free(nfile->name);
1000 		free(nfile);
1001 		return NULL;
1002 	}
1003 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
1004 	nfile->ungetsize = 16;
1005 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
1006 	TAILQ_INSERT_TAIL(&files, nfile, entry);
1007 	return nfile;
1008 }
1009 
1010 int
1011 popfile(void)
1012 {
1013 	struct file	*prev;
1014 
1015 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
1016 		prev->errors += file->errors;
1017 
1018 	TAILQ_REMOVE(&files, file, entry);
1019 	fclose(file->stream);
1020 	free(file->name);
1021 	free(file->ungetbuf);
1022 	free(file);
1023 	file = prev;
1024 	return file ? 0 : EOF;
1025 }
1026 
1027 int
1028 parse_conf(struct conf *c, const char *filename)
1029 {
1030 	struct sym		*sym, *next;
1031 
1032 	default_host = "*";
1033 	default_port = 1965;
1034 
1035 	conf = c;
1036 
1037 	file = pushfile(filename, 0);
1038 	if (file == NULL)
1039 		return -1;
1040 	topfile = file;
1041 
1042 	yyparse();
1043 	errors = file->errors;
1044 	popfile();
1045 
1046 	/* Free macros and check which have not been used. */
1047 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
1048 		/* TODO: warn if !sym->used */
1049 		if (!sym->persist) {
1050 			free(sym->name);
1051 			free(sym->val);
1052 			TAILQ_REMOVE(&symhead, sym, entry);
1053 			free(sym);
1054 		}
1055 	}
1056 
1057 	if (errors)
1058 		return -1;
1059 	return 0;
1060 }
1061 
1062 int
1063 symset(const char *name, const char *val, int persist)
1064 {
1065 	struct sym *sym;
1066 
1067 	TAILQ_FOREACH(sym, &symhead, entry) {
1068 		if (!strcmp(name, sym->name))
1069 			break;
1070 	}
1071 
1072 	if (sym != NULL) {
1073 		if (sym->persist)
1074 			return 0;
1075 		else {
1076 			free(sym->name);
1077 			free(sym->val);
1078 			TAILQ_REMOVE(&symhead, sym, entry);
1079 			free(sym);
1080 		}
1081 	}
1082 
1083 	sym = xcalloc(1, sizeof(*sym));
1084 	sym->name = xstrdup(name);
1085 	sym->val = xstrdup(val);
1086 	sym->used = 0;
1087 	sym->persist = persist;
1088 
1089 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1090 	return 0;
1091 }
1092 
1093 int
1094 cmdline_symset(char *s)
1095 {
1096 	char	*sym, *val;
1097 	int	 ret;
1098 
1099 	if ((val = strrchr(s, '=')) == NULL)
1100 		return -1;
1101 	sym = xcalloc(1, val - s + 1);
1102 	memcpy(sym, s, val - s);
1103 	ret = symset(sym, val + 1, 1);
1104 	free(sym);
1105 	return ret;
1106 }
1107 
1108 char *
1109 symget(const char *nam)
1110 {
1111 	struct sym	*sym;
1112 
1113 	TAILQ_FOREACH(sym, &symhead, entry) {
1114 		if (strcmp(nam, sym->name) == 0) {
1115 			sym->used = 1;
1116 			return sym->val;
1117 		}
1118 	}
1119 	return NULL;
1120 }
1121 
1122 char *
1123 ensure_absolute_path(char *path)
1124 {
1125 	if (path == NULL || *path != '/')
1126 		yyerror("not an absolute path: %s", path);
1127 	return path;
1128 }
1129 
1130 int
1131 check_block_code(int n)
1132 {
1133 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1134 		yyerror("invalid block code %d", n);
1135 	return n;
1136 }
1137 
1138 char *
1139 check_block_fmt(char *fmt)
1140 {
1141 	char *s;
1142 
1143 	for (s = fmt; *s; ++s) {
1144 		if (*s != '%')
1145 			continue;
1146 		switch (*++s) {
1147 		case '%':
1148 		case 'p':
1149 		case 'q':
1150 		case 'P':
1151 		case 'N':
1152 			break;
1153 		default:
1154 			yyerror("invalid format specifier %%%c", *s);
1155 		}
1156 	}
1157 
1158 	return fmt;
1159 }
1160 
1161 int
1162 check_strip_no(int n)
1163 {
1164 	if (n <= 0)
1165 		yyerror("invalid strip number %d", n);
1166 	return n;
1167 }
1168 
1169 int
1170 check_port_num(int n)
1171 {
1172 	if (n <= 0 || n >= UINT16_MAX)
1173 		yyerror("port number is %s: %d",
1174 		    n <= 0 ? "too small" : "too large",
1175 		    n);
1176 	return n;
1177 }
1178 
1179 int
1180 check_prefork_num(int n)
1181 {
1182 	if (n <= 0 || n >= PROC_MAX_INSTANCES)
1183 		yyerror("invalid prefork number %d", n);
1184 	return n;
1185 }
1186 
1187 void
1188 advance_loc(void)
1189 {
1190 	loc = new_location();
1191 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1192 }
1193 
1194 void
1195 advance_proxy(void)
1196 {
1197 	proxy = new_proxy();
1198 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1199 }
1200 
1201 void
1202 parsehp(char *str, char **host, const char **port, const char *def)
1203 {
1204 	char		*at;
1205 	const char	*errstr;
1206 
1207 	*host = str;
1208 
1209 	if ((at = strchr(str, ':')) != NULL) {
1210 		*at++ = '\0';
1211 		*port = at;
1212 	} else
1213 		*port = def;
1214 
1215 	strtonum(*port, 1, UINT16_MAX, &errstr);
1216 	if (errstr != NULL)
1217 		yyerror("port is %s: %s", errstr, *port);
1218 }
1219 
1220 int
1221 fastcgi_conf(const char *path, const char *port)
1222 {
1223 	struct fcgi	*f;
1224 	int		i = 0;
1225 
1226 	TAILQ_FOREACH(f, &conf->fcgi, fcgi) {
1227 		if (!strcmp(f->path, path) &&
1228 		    ((port == NULL && *f->port == '\0') ||
1229 		     !strcmp(f->port, port)))
1230 			return i;
1231 		++i;
1232 	}
1233 
1234 	f = xcalloc(1, sizeof(*f));
1235 	f->id = i;
1236 	(void)strlcpy(f->path, path, sizeof(f->path));
1237 	if (port != NULL)
1238 		(void)strlcpy(f->port, port, sizeof(f->port));
1239 	TAILQ_INSERT_TAIL(&conf->fcgi, f, fcgi);
1240 
1241 	return f->id;
1242 }
1243 
1244 void
1245 add_param(char *name, char *val)
1246 {
1247 	struct envlist *e;
1248 	struct envhead *h = &loc->params;
1249 
1250 	e = xcalloc(1, sizeof(*e));
1251 	(void) strlcpy(e->name, name, sizeof(e->name));
1252 	(void) strlcpy(e->value, val, sizeof(e->value));
1253 	TAILQ_INSERT_TAIL(h, e, envs);
1254 }
1255 
1256 int
1257 getservice(const char *n)
1258 {
1259 	struct servent	*s;
1260 	const char	*errstr;
1261 	long long	 llval;
1262 
1263 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1264 	if (errstr) {
1265 		s = getservbyname(n, "tcp");
1266 		if (s == NULL)
1267 			s = getservbyname(n, "udp");
1268 		if (s == NULL)
1269 			return (-1);
1270 		return (ntohs(s->s_port));
1271 	}
1272 
1273 	return ((unsigned short)llval);
1274 }
1275 
1276 static void
1277 add_to_addr_queue(struct addrhead *a, struct addrinfo *ai)
1278 {
1279 	struct address		*addr;
1280 	struct sockaddr_in	*sin;
1281 	struct sockaddr_in6	*sin6;
1282 
1283 	if (ai->ai_addrlen > sizeof(addr->ss))
1284 		fatalx("ai_addrlen larger than a sockaddr_storage");
1285 
1286 	TAILQ_FOREACH(addr, a, addrs) {
1287 		if (addr->ai_flags == ai->ai_flags &&
1288 		    addr->ai_family == ai->ai_family &&
1289 		    addr->ai_socktype == ai->ai_socktype &&
1290 		    addr->ai_protocol == ai->ai_protocol &&
1291 		    addr->slen == ai->ai_addrlen &&
1292 		    !memcmp(&addr->ss, ai->ai_addr, addr->slen))
1293 			return;
1294 	}
1295 
1296 	addr = xcalloc(1, sizeof(*addr));
1297 	addr->ai_flags = ai->ai_flags;
1298 	addr->ai_family = ai->ai_family;
1299 	addr->ai_socktype = ai->ai_socktype;
1300 	addr->ai_protocol = ai->ai_protocol;
1301 	addr->slen = ai->ai_addrlen;
1302 	memcpy(&addr->ss, ai->ai_addr, ai->ai_addrlen);
1303 
1304 	/* for commodity */
1305 	switch (addr->ai_family) {
1306 	case AF_INET:
1307 		sin = (struct sockaddr_in *)&addr->ss;
1308 		addr->port = ntohs(sin->sin_port);
1309 		break;
1310 	case AF_INET6:
1311 		sin6 = (struct sockaddr_in6 *)&addr->ss;
1312 		addr->port = ntohs(sin6->sin6_port);
1313 		break;
1314 	default:
1315 		fatalx("unknown socket family %d", addr->ai_family);
1316 	}
1317 
1318 	addr->sock = -1;
1319 
1320 	TAILQ_INSERT_HEAD(a, addr, addrs);
1321 }
1322 
1323 void
1324 listen_on(const char *hostname, const char *servname)
1325 {
1326 	struct addrinfo hints, *res, *res0;
1327 	int error;
1328 
1329 	memset(&hints, 0, sizeof(hints));
1330 	hints.ai_family = AF_UNSPEC;
1331 	hints.ai_socktype = SOCK_STREAM;
1332 	hints.ai_flags = AI_PASSIVE;
1333 	error = getaddrinfo(hostname, servname, &hints, &res0);
1334 	if (error) {
1335 		yyerror("listen on \"%s\" port %s: %s", hostname, servname,
1336 		    gai_strerror(errno));
1337 		return;
1338 	}
1339 
1340 	for (res = res0; res; res = res->ai_next) {
1341 		add_to_addr_queue(&host->addrs, res);
1342 		add_to_addr_queue(&conf->addrs, res);
1343 	}
1344 
1345 	freeaddrinfo(res0);
1346 }