1 %{
2 
3 /*
4  * Copyright (c) 2021-2024 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 #include <syslog.h>
36 
37 #include "log.h"
38 
39 struct conf *conf;
40 
41 static const char	*default_host = NULL;
42 static uint16_t		 default_port = 1965;
43 
44 TAILQ_HEAD(files, file)		 files = TAILQ_HEAD_INITIALIZER(files);
45 static struct file {
46 	TAILQ_ENTRY(file)	 entry;
47 	FILE			*stream;
48 	char			*name;
49 	size_t			 ungetpos;
50 	size_t			 ungetsize;
51 	u_char			*ungetbuf;
52 	int			 eof_reached;
53 	int			 lineno;
54 	int			 errors;
55 } *file, *topfile;
56 
57 struct file	*pushfile(const char *, int);
58 int		 popfile(void);
59 int		 yyparse(void);
60 int		 yylex(void);
61 void		 yyerror(const char *, ...)
62     __attribute__((__format__ (printf, 1, 2)))
63     __attribute__((__nonnull__ (1)));
64 void		 yywarn(const char *, ...)
65     __attribute__((__format__ (printf, 1, 2)))
66     __attribute__((__nonnull__ (1)));
67 int		 kw_cmp(const void *, const void *);
68 int		 lookup(char *);
69 int		 igetc(void);
70 int		 lgetc(int);
71 void		 lungetc(int);
72 int		 findeol(void);
73 
74 /*
75  * #define YYDEBUG 1
76  * int yydebug = 1;
77  */
78 
79 TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
80 struct sym {
81 	TAILQ_ENTRY(sym)	 entry;
82 	int			 used;
83 	int			 persist;
84 	char			*name;
85 	char			*val;
86 };
87 
88 int	 symset(const char *, const char *, int);
89 char	*symget(const char *);
90 
91 char		*ensure_absolute_path(char*);
92 int		 check_block_code(int);
93 char		*check_block_fmt(char*);
94 int		 check_strip_no(int);
95 int		 check_prefork_num(int);
96 void		 advance_loc(void);
97 void		 advance_proxy(void);
98 int		 fastcgi_conf(const char *, const char *);
99 void		 add_param(char *, char *);
100 int		 getservice(const char *);
101 void		 listen_on(const char *, const char *);
102 
103 static struct vhost		*host;
104 static struct location		*loc;
105 static struct proxy		*proxy;
106 static char			*current_media;
107 static int			 errors;
108 
109 typedef struct {
110 	union {
111 		char	*string;
112 		int	 number;
113 	} v;
114 	int lineno;
115 } YYSTYPE;
116 
117 #define YYSTYPE YYSTYPE
118 
119 %}
120 
121 /* for bison: */
122 /* %define parse.error verbose */
123 
124 %token	ACCESS ALIAS AUTO
125 %token	BLOCK
126 %token	CA CERT CHROOT CLIENT
127 %token	DEFAULT
128 %token	FACILITY FASTCGI FOR_HOST
129 %token	INCLUDE INDEX IPV6
130 %token	KEY
131 %token	LANG LISTEN LOCATION LOG
132 %token	OCSP OFF ON
133 %token	PARAM PORT PREFORK PROTO PROTOCOLS PROXY
134 %token	RELAY_TO REQUIRE RETURN ROOT
135 %token	SERVER SNI SOCKET STRIP STYLE SYSLOG
136 %token	TCP TOEXT TYPE TYPES
137 %token	USE_TLS USER
138 %token	VERIFYNAME
139 
140 %token	ERROR
141 
142 %token	<v.string>	STRING
143 %token	<v.number>	NUM
144 
145 %type	<v.number>	bool proxy_port
146 %type	<v.string>	string numberstring listen_addr
147 
148 %%
149 
150 conf		: /* empty */
151 		| conf include nl
152 		| conf varset nl
153 		| conf option nl
154 		| conf vhost nl
155 		| conf types nl
156 		| conf error nl		{ file->errors++; }
157 		;
158 
159 include		: INCLUDE STRING		{
160 			struct file	*nfile;
161 
162 			if ((nfile = pushfile($2, 0)) == NULL) {
163 				yyerror("failed to include file %s", $2);
164 				free($2);
165 				YYERROR;
166 			}
167 			free($2);
168 
169 			file = nfile;
170 			lungetc('\n');
171 		}
172 		;
173 
174 bool		: ON	{ $$ = 1; }
175 		| OFF	{ $$ = 0; }
176 		;
177 
178 string		: string STRING	{
179 			if (asprintf(&$$, "%s%s", $1, $2) == -1) {
180 				free($1);
181 				free($2);
182 				yyerror("string: asprintf: %s", strerror(errno));
183 				YYERROR;
184 			}
185 			free($1);
186 			free($2);
187 		}
188 		| STRING
189 		;
190 
191 numberstring	: NUM {
192 			char *s;
193 			if (asprintf(&s, "%d", $1) == -1) {
194 				yyerror("asprintf: number");
195 				YYERROR;
196 			}
197 			$$ = s;
198 		}
199 		| STRING
200 		;
201 
202 varset		: STRING '=' string		{
203 			char *s = $1;
204 			while (*s++) {
205 				if (isspace((unsigned char)*s)) {
206 					yyerror("macro name cannot contain "
207 					    "whitespaces");
208 					free($1);
209 					free($3);
210 					YYERROR;
211 				}
212 			}
213 			symset($1, $3, 0);
214 			free($1);
215 			free($3);
216 		}
217 		;
218 
219 option		: CHROOT string	{
220 			if (strlcpy(conf->chroot, $2, sizeof(conf->chroot)) >=
221 			    sizeof(conf->chroot))
222 				yyerror("chroot path too long");
223 			free($2);
224 		}
225 		| IPV6 bool {
226 			yywarn("option `ipv6' is deprecated,"
227 			    " please use `listen on'");
228 			if ($2)
229 				default_host = NULL;
230 			else
231 				default_host = "0.0.0.0";
232 		}
233 		| log
234 		| PORT NUM {
235 			yywarn("option `port' is deprecated,"
236 			    " please use `listen on'");
237 			default_port = $2;
238 		}
239 		| PREFORK NUM		{ conf->prefork = check_prefork_num($2); }
240 		| PROTOCOLS string {
241 			if (tls_config_parse_protocols(&conf->protos, $2) == -1)
242 				yyerror("invalid protocols string \"%s\"", $2);
243 			free($2);
244 		}
245 		| USER string {
246 			if (strlcpy(conf->user, $2, sizeof(conf->user)) >=
247 			    sizeof(conf->user))
248 				yyerror("user name too long");
249 			free($2);
250 		}
251 		;
252 
253 log		: LOG '{' optnl logopts '}'
254 		| LOG logopt
255 		;
256 
257 logopts		: /* empty */
258 		| logopts logopt optnl
259 		;
260 
261 logopt		: ACCESS string		{
262 			free(conf->log_access);
263 			conf->log_access = $2;
264 		}
265 		| STYLE string {
266 			if (!strcmp("combined", $2))
267 				conf->log_format = LOG_FORMAT_COMBINED;
268 			else if (!strcmp("common", $2))
269 				conf->log_format = LOG_FORMAT_COMMON;
270 			else if (!strcmp("condensed", $2))
271 				conf->log_format = LOG_FORMAT_CONDENSED;
272 			else if (!strcmp("legacy", $2))
273 				conf->log_format = LOG_FORMAT_LEGACY;
274 			else
275 				yyerror("unknown log style: %s", $2);
276 			free($2);
277 		}
278 		| SYSLOG FACILITY string {
279 			const char *str = $3;
280 
281 			conf->log_syslog = 1;
282 
283 			if (!strncasecmp(str, "LOG_", 4))
284 				str += 4;
285 
286 			if (!strcasecmp(str, "daemon"))
287 				conf->log_facility = LOG_DAEMON;
288 #ifdef LOG_FTP
289 			else if (!strcasecmp(str, "ftp"))
290 				conf->log_facility = LOG_FTP;
291 #endif
292 			else if (!strcasecmp(str, "local1"))
293 				conf->log_facility = LOG_LOCAL1;
294 			else if (!strcasecmp(str, "local2"))
295 				conf->log_facility = LOG_LOCAL2;
296 			else if (!strcasecmp(str, "local3"))
297 				conf->log_facility = LOG_LOCAL3;
298 			else if (!strcasecmp(str, "local4"))
299 				conf->log_facility = LOG_LOCAL4;
300 			else if (!strcasecmp(str, "local5"))
301 				conf->log_facility = LOG_LOCAL5;
302 			else if (!strcasecmp(str, "local6"))
303 				conf->log_facility = LOG_LOCAL6;
304 			else if (!strcasecmp(str, "local7"))
305 				conf->log_facility = LOG_LOCAL7;
306 			else if (!strcasecmp(str, "user"))
307 				conf->log_facility = LOG_USER;
308 			else
309 				yywarn("unknown syslog facility `%s'",
310 				    $3);
311 
312 			free($3);
313 		}
314 		| SYSLOG OFF		{
315 			conf->log_syslog = 0;
316 		}
317 		| SYSLOG		{
318 			conf->log_syslog = 1;
319 		}
320 		;
321 
322 vhost		: SERVER string {
323 			host = new_vhost();
324 			TAILQ_INSERT_HEAD(&conf->hosts, host, vhosts);
325 
326 			loc = new_location();
327 			TAILQ_INSERT_HEAD(&host->locations, loc, locations);
328 
329 			TAILQ_INIT(&host->proxies);
330 
331 			(void) strlcpy(loc->match, "*", sizeof(loc->match));
332 			(void) strlcpy(host->domain, $2, sizeof(host->domain));
333 
334 			if (strstr($2, "xn--") != NULL) {
335 				yywarn("\"%s\" looks like punycode: you "
336 				    "should use the decoded hostname", $2);
337 			}
338 
339 			free($2);
340 		} '{' optnl servbody '}' {
341 			if (host->cert_path == NULL ||
342 			    host->key_path == NULL)
343 				yyerror("invalid vhost definition: %s",
344 				    host->domain);
345 			if (TAILQ_EMPTY(&host->addrs)) {
346 				char portno[32];
347 				int r;
348 
349 				r = snprintf(portno, sizeof(portno), "%d",
350 				    default_port);
351 				if (r < 0 || (size_t)r >= sizeof(portno))
352 					fatal("snprintf");
353 
354 				yywarn("missing `listen on' in server %s,"
355 				    " assuming %s port %d", host->domain,
356 				    default_host ? default_host : "*",
357 				    default_port);
358 				listen_on(default_host, portno);
359 			}
360 		}
361 		| error '}'		{ yyerror("bad server directive"); }
362 		;
363 
364 servbody	: /* empty */
365 		| servbody servopt optnl
366 		| servbody location optnl
367 		| servbody proxy optnl
368 		;
369 
370 listen_addr	: '*' { $$ = NULL; }
371 		| STRING
372 		;
373 
374 servopt		: ALIAS string {
375 			struct alist *a;
376 
377 			a = xcalloc(1, sizeof(*a));
378 			(void) strlcpy(a->alias, $2, sizeof(a->alias));
379 			free($2);
380 			TAILQ_INSERT_TAIL(&host->aliases, a, aliases);
381 		}
382 		| CERT string		{
383 			ensure_absolute_path($2);
384 			free(host->cert_path);
385 			host->cert_path = $2;
386 		}
387 		| KEY string		{
388 			ensure_absolute_path($2);
389 			free(host->key_path);
390 			host->key_path = $2;
391 		}
392 		| OCSP string		{
393 			ensure_absolute_path($2);
394 			free(host->ocsp_path);
395 			host->ocsp_path = $2;
396 		}
397 		| PARAM string '=' string {
398 			yywarn("the top-level `param' directive is deprecated."
399 			    "  Please use `fastcgi { param ... }`");
400 			add_param($2, $4);
401 		}
402 		| LISTEN ON listen_addr {
403 			listen_on($3, "1965");
404 			free($3);
405 		}
406 		| LISTEN ON listen_addr PORT STRING {
407 			listen_on($3, $5);
408 			free($3);
409 			free($5);
410 		}
411 		| LISTEN ON listen_addr PORT NUM {
412 			char portno[32];
413 			int r;
414 
415 			r = snprintf(portno, sizeof(portno), "%d", $5);
416 			if (r < 0 || (size_t)r >= sizeof(portno))
417 				fatal("snprintf");
418 
419 			listen_on($3, portno);
420 			free($3);
421 		}
422 		| locopt
423 		;
424 
425 proxy		: PROXY { advance_proxy(); }
426 		  proxy_matches '{' optnl proxy_opts '}' {
427 			if (*proxy->host == '\0')
428 				yyerror("invalid proxy block: missing `relay-to' option");
429 
430 			if ((proxy->cert_path == NULL && proxy->key_path != NULL) ||
431 			    (proxy->cert_path != NULL && proxy->key_path == NULL))
432 				yyerror("invalid proxy block: missing cert or key");
433 		}
434 		;
435 
436 proxy_matches	: /* empty */
437 		| proxy_matches proxy_match
438 		;
439 
440 proxy_port	: /* empty */	{ $$ = 1965; }
441 		| PORT STRING {
442 			if (($$ = getservice($2)) == -1)
443 				yyerror("invalid port number %s", $2);
444 			free($2);
445 		}
446 		| PORT NUM	{ $$ = $2; }
447 		;
448 
449 proxy_match	: PROTO string {
450 			(void) strlcpy(proxy->match_proto, $2, sizeof(proxy->match_proto));
451 			free($2);
452 		}
453 		| FOR_HOST string proxy_port {
454 			(void) strlcpy(proxy->match_host, $2, sizeof(proxy->match_host));
455 			(void) snprintf(proxy->match_port, sizeof(proxy->match_port),
456 			    "%d", $3);
457 			free($2);
458 		}
459 		;
460 
461 proxy_opts	: /* empty */
462 		| proxy_opts proxy_opt optnl
463 		;
464 
465 proxy_opt	: CERT string {
466 			free(proxy->cert);
467 			ensure_absolute_path($2);
468 			proxy->cert_path = $2;
469 		}
470 		| KEY string {
471 			free(proxy->key);
472 			ensure_absolute_path($2);
473 			proxy->key_path = $2;
474 		}
475 		| PROTOCOLS string {
476 			if (tls_config_parse_protocols(&proxy->protocols, $2) == -1)
477 				yyerror("invalid protocols string \"%s\"", $2);
478 			free($2);
479 		}
480 		| RELAY_TO string proxy_port {
481 			(void) strlcpy(proxy->host, $2, sizeof(proxy->host));
482 			(void) snprintf(proxy->port, sizeof(proxy->port),
483 			    "%d", $3);
484 			free($2);
485 		}
486 		| REQUIRE CLIENT CA string {
487 			ensure_absolute_path($4);
488 			proxy->reqca_path = $4;
489 		}
490 		| SNI string {
491 			(void) strlcpy(proxy->sni, $2, sizeof(proxy->sni));
492 			free($2);
493 		}
494 		| USE_TLS bool {
495 			proxy->notls = !$2;
496 		}
497 		| VERIFYNAME bool {
498 			proxy->noverifyname = !$2;
499 		}
500 		;
501 
502 location	: LOCATION { advance_loc(); } string '{' optnl locopts '}' {
503 			/* drop the starting '/' if any */
504 			if (*$3 == '/')
505 				memmove($3, $3+1, strlen($3));
506 			(void) strlcpy(loc->match, $3, sizeof(loc->match));
507 			free($3);
508 		}
509 		| error '}'
510 		;
511 
512 locopts		: /* empty */
513 		| locopts locopt optnl
514 		;
515 
516 locopt		: AUTO INDEX bool	{ loc->auto_index = $3 ? 1 : -1; }
517 		| BLOCK RETURN NUM string {
518 			check_block_fmt($4);
519 			(void) strlcpy(loc->block_fmt, $4, sizeof(loc->block_fmt));
520 			loc->block_code = check_block_code($3);
521 			free($4);
522 		}
523 		| BLOCK RETURN NUM {
524 			(void) strlcpy(loc->block_fmt, "temporary failure",
525 			    sizeof(loc->block_fmt));
526 			loc->block_code = check_block_code($3);
527 			if ($3 >= 30 && $3 < 40)
528 				yyerror("missing `meta' for block return %d", $3);
529 		}
530 		| BLOCK {
531 			(void) strlcpy(loc->block_fmt, "temporary failure",
532 			    sizeof(loc->block_fmt));
533 			loc->block_code = 40;
534 		}
535 		| DEFAULT TYPE string {
536 			(void) strlcpy(loc->default_mime, $3,
537 			    sizeof(loc->default_mime));
538 			free($3);
539 		}
540 		| fastcgi
541 		| INDEX string {
542 			(void) strlcpy(loc->index, $2, sizeof(loc->index));
543 			free($2);
544 		}
545 		| LANG string {
546 			(void) strlcpy(loc->lang, $2,
547 			    sizeof(loc->lang));
548 			free($2);
549 		}
550 		| LOG bool	{ loc->disable_log = !$2; }
551 		| REQUIRE CLIENT CA string {
552 			ensure_absolute_path($4);
553 			loc->reqca_path = $4;
554 		}
555 		| ROOT string		{
556 			(void) strlcpy(loc->dir, $2, sizeof(loc->dir));
557 			free($2);
558 		}
559 		| STRIP NUM		{ loc->strip = check_strip_no($2); }
560 		;
561 
562 fastcgi		: FASTCGI '{' optnl fastcgiopts '}'
563 		| FASTCGI fastcgiopt
564 		| FASTCGI OFF {
565 			loc->fcgi = -1;
566 			loc->nofcgi = 1;
567 		}
568 		| FASTCGI string {
569 			yywarn("`fastcgi path' is deprecated.  "
570 			    "Please use `fastcgi socket path' instead.");
571 			loc->fcgi = fastcgi_conf($2, NULL);
572 			free($2);
573 		}
574 		;
575 
576 fastcgiopts	: /* empty */
577 		| fastcgiopts fastcgiopt optnl
578 		;
579 
580 fastcgiopt	: PARAM string '=' string {
581 			add_param($2, $4);
582 		}
583 		| SOCKET string {
584 			loc->fcgi = fastcgi_conf($2, NULL);
585 			free($2);
586 		}
587 		| SOCKET TCP string PORT NUM {
588 			char *c;
589 
590 			if (asprintf(&c, "%d", $5) == -1)
591 				fatal("asprintf");
592 			loc->fcgi = fastcgi_conf($3, c);
593 			free($3);
594 			free(c);
595 		}
596 		| SOCKET TCP string {
597 			loc->fcgi = fastcgi_conf($3, "9000");
598 		}
599 		| SOCKET TCP string PORT string {
600 			loc->fcgi = fastcgi_conf($3, $5);
601 			free($3);
602 			free($5);
603 		}
604 		| STRIP NUM {
605 			loc->fcgi_strip = $2;
606 		}
607 		;
608 
609 types		: TYPES '{' optnl mediaopts_l '}' ;
610 
611 mediaopts_l	: mediaopts_l mediaoptsl nl
612 		| mediaoptsl nl
613 		;
614 
615 mediaoptsl	: STRING {
616 			free(current_media);
617 			current_media = $1;
618 		} medianames_l
619 		| include
620 		;
621 
622 medianames_l	: medianames_l medianamesl
623 		| medianamesl
624 		;
625 
626 medianamesl	: numberstring {
627 			if (add_mime(&conf->mime, current_media, $1) == -1)
628 				fatal("add_mime");
629 			free($1);
630 		}
631 		;
632 
633 nl		: '\n' optnl
634 		| ';' optnl
635 		;
636 
637 optnl		: nl
638 		| /*empty*/
639 		;
640 
641 %%
642 
643 static const struct keyword {
644 	const char *word;
645 	int token;
646 } keywords[] = {
647 	/* these MUST be sorted */
648 	{"access", ACCESS},
649 	{"alias", ALIAS},
650 	{"auto", AUTO},
651 	{"block", BLOCK},
652 	{"ca", CA},
653 	{"cert", CERT},
654 	{"chroot", CHROOT},
655 	{"client", CLIENT},
656 	{"default", DEFAULT},
657 	{"facility", FACILITY},
658 	{"fastcgi", FASTCGI},
659 	{"for-host", FOR_HOST},
660 	{"include", INCLUDE},
661 	{"index", INDEX},
662 	{"ipv6", IPV6},
663 	{"key", KEY},
664 	{"lang", LANG},
665 	{"listen", LISTEN},
666 	{"location", LOCATION},
667 	{"log", LOG},
668 	{"ocsp", OCSP},
669 	{"off", OFF},
670 	{"on", ON},
671 	{"param", PARAM},
672 	{"port", PORT},
673 	{"prefork", PREFORK},
674 	{"proto", PROTO},
675 	{"protocols", PROTOCOLS},
676 	{"proxy", PROXY},
677 	{"relay-to", RELAY_TO},
678 	{"require", REQUIRE},
679 	{"return", RETURN},
680 	{"root", ROOT},
681 	{"server", SERVER},
682 	{"sni", SNI},
683 	{"socket", SOCKET},
684 	{"strip", STRIP},
685 	{"style", STYLE},
686 	{"syslog", SYSLOG},
687 	{"tcp", TCP},
688 	{"to-ext", TOEXT},
689 	{"type", TYPE},
690 	{"types", TYPES},
691 	{"use-tls", USE_TLS},
692 	{"user", USER},
693 	{"verifyname", VERIFYNAME},
694 };
695 
696 void
697 yyerror(const char *msg, ...)
698 {
699 	va_list ap;
700 
701 	file->errors++;
702 
703 	va_start(ap, msg);
704 	fprintf(stderr, "%s:%d error: ", config_path, yylval.lineno);
705 	vfprintf(stderr, msg, ap);
706 	fprintf(stderr, "\n");
707 	va_end(ap);
708 }
709 
710 void
711 yywarn(const char *msg, ...)
712 {
713 	va_list ap;
714 
715 	va_start(ap, msg);
716 	fprintf(stderr, "%s:%d warning: ", config_path, yylval.lineno);
717 	vfprintf(stderr, msg, ap);
718 	fprintf(stderr, "\n");
719 	va_end(ap);
720 }
721 
722 int
723 kw_cmp(const void *k, const void *e)
724 {
725 	return strcmp(k, ((struct keyword *)e)->word);
726 }
727 
728 int
729 lookup(char *s)
730 {
731 	const struct keyword	*p;
732 
733 	p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
734 	    sizeof(keywords[0]), kw_cmp);
735 
736 	if (p)
737 		return p->token;
738 	else
739 		return STRING;
740 }
741 
742 #define START_EXPAND	1
743 #define DONE_EXPAND	2
744 
745 static int	expanding;
746 
747 int
748 igetc(void)
749 {
750 	int	c;
751 
752 	while (1) {
753 		if (file->ungetpos > 0)
754 			c = file->ungetbuf[--file->ungetpos];
755 		else
756 			c = getc(file->stream);
757 
758 		if (c == START_EXPAND)
759 			expanding = 1;
760 		else if (c == DONE_EXPAND)
761 			expanding = 0;
762 		else
763 			break;
764 	}
765 	return c;
766 }
767 
768 int
769 lgetc(int quotec)
770 {
771 	int		c, next;
772 
773 	if (quotec) {
774 		if ((c = igetc()) == EOF) {
775 			yyerror("reached end of file while parsing "
776 			    "quoted string");
777 			if (file == topfile || popfile() == EOF)
778 				return EOF;
779 			return quotec;
780 		}
781 		return c;
782 	}
783 
784 	while ((c = igetc()) == '\\') {
785 		next = igetc();
786 		if (next != '\n') {
787 			c = next;
788 			break;
789 		}
790 		yylval.lineno = file->lineno;
791 		file->lineno++;
792 	}
793 
794 	if (c == EOF) {
795 		/*
796 		 * Fake EOL when hit EOF for the first time. This gets line
797 		 * count right if last line in included file is syntactically
798 		 * invalid and has no newline.
799 		 */
800 		if (file->eof_reached == 0) {
801 			file->eof_reached = 1;
802 			return '\n';
803 		}
804 		while (c == EOF) {
805 			if (file == topfile || popfile() == EOF)
806 				return EOF;
807 			c = igetc();
808 		}
809 	}
810 	return c;
811 }
812 
813 void
814 lungetc(int c)
815 {
816 	if (c == EOF)
817 		return;
818 
819 	if (file->ungetpos >= file->ungetsize) {
820 		void *p = reallocarray(file->ungetbuf, file->ungetsize, 2);
821 		if (p == NULL)
822 			fatal("lungetc");
823 		file->ungetbuf = p;
824 		file->ungetsize *= 2;
825 	}
826 	file->ungetbuf[file->ungetpos++] = c;
827 }
828 
829 int
830 findeol(void)
831 {
832 	int	c;
833 
834 	/* Skip to either EOF or the first real EOL. */
835 	while (1) {
836 		c = lgetc(0);
837 		if (c == '\n') {
838 			file->lineno++;
839 			break;
840 		}
841 		if (c == EOF)
842 			break;
843 	}
844 	return ERROR;
845 }
846 
847 int
848 yylex(void)
849 {
850 	char	 buf[8096];
851 	char	*p, *val;
852 	int	 quotec, next, c;
853 	int	 token;
854 
855 top:
856 	p = buf;
857 	while ((c = lgetc(0)) == ' ' || c == '\t')
858 		; /* nothing */
859 
860 	yylval.lineno = file->lineno;
861 	if (c == '#')
862 		while ((c = lgetc(0)) != '\n' && c != EOF)
863 			; /* nothing */
864 	if (c == '$' && !expanding) {
865 		while (1) {
866 			if ((c = lgetc(0)) == EOF)
867 				return 0;
868 			if (p + 1 >= buf + sizeof(buf) -1) {
869 				yyerror("string too long");
870 				return findeol();
871 			}
872 			if (isalnum(c) || c == '_') {
873 				*p++ = c;
874 				continue;
875 			}
876 			*p = '\0';
877 			lungetc(c);
878 			break;
879 		}
880 		val = symget(buf);
881 		if (val == NULL) {
882 			yyerror("macro `%s' not defined", buf);
883 			return findeol();
884 		}
885 		yylval.v.string = xstrdup(val);
886 		return STRING;
887 	}
888 	if (c == '@' && !expanding) {
889 		while (1) {
890 			if ((c = lgetc(0)) == EOF)
891 				return 0;
892 
893 			if (p + 1 >= buf + sizeof(buf) - 1) {
894 				yyerror("string too long");
895 				return findeol();
896 			}
897 			if (isalnum(c) || c == '_') {
898 				*p++ = c;
899 				continue;
900 			}
901 			*p = '\0';
902 			lungetc(c);
903 			break;
904 		}
905 		val = symget(buf);
906 		if (val == NULL) {
907 			yyerror("macro '%s' not defined", buf);
908 			return findeol();
909 		}
910 		p = val + strlen(val) - 1;
911 		lungetc(DONE_EXPAND);
912 		while (p >= val) {
913 			lungetc(*p);
914 			p--;
915 		}
916 		lungetc(START_EXPAND);
917 		goto top;
918 	}
919 
920 	switch (c) {
921 	case '\'':
922 	case '"':
923 		quotec = c;
924 		while (1) {
925 			if ((c = lgetc(quotec)) == EOF)
926 				return 0;
927 			if (c == '\n') {
928 				file->lineno++;
929 				continue;
930 			} else if (c == '\\') {
931 				if ((next = lgetc(quotec)) == EOF)
932 					return (0);
933 				if (next == quotec || next == ' ' ||
934 				    next == '\t')
935 					c = next;
936 				else if (next == '\n') {
937 					file->lineno++;
938 					continue;
939 				} else
940 					lungetc(next);
941 			} else if (c == quotec) {
942 				*p = '\0';
943 				break;
944 			} else if (c == '\0') {
945 				yyerror("invalid syntax");
946 				return findeol();
947 			}
948 			if (p + 1 >= buf + sizeof(buf) - 1) {
949 				yyerror("string too long");
950 				return findeol();
951 			}
952 			*p++ = c;
953 		}
954 		yylval.v.string = strdup(buf);
955 		if (yylval.v.string == NULL)
956 			fatal("yylex: strdup");
957 		return STRING;
958 	}
959 
960 #define allowed_to_end_number(x) \
961 	(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
962 
963 	if (c == '-' || isdigit(c)) {
964 		do {
965 			*p++ = c;
966 			if ((size_t)(p-buf) >= sizeof(buf)) {
967 				yyerror("string too long");
968 				return findeol();
969 			}
970 		} while ((c = lgetc(0)) != EOF && isdigit(c));
971 		lungetc(c);
972 		if (p == buf + 1 && buf[0] == '-')
973 			goto nodigits;
974 		if (c == EOF || allowed_to_end_number(c)) {
975 			const char *errstr = NULL;
976 
977 			*p = '\0';
978 			yylval.v.number = strtonum(buf, LLONG_MIN,
979 			    LLONG_MAX, &errstr);
980 			if (errstr) {
981 				yyerror("\"%s\" invalid number: %s",
982 				    buf, errstr);
983 				return findeol();
984 			}
985 			return NUM;
986 		} else {
987 nodigits:
988 			while (p > buf + 1)
989 				lungetc(*--p);
990 			c = *--p;
991 			if (c == '-')
992 				return c;
993 		}
994 	}
995 
996 #define allowed_in_string(x) \
997 	(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
998 	x != '{' && x != '}' && \
999 	x != '!' && x != '=' && x != '#' && \
1000 	x != ',' && x != ';'))
1001 
1002 	if (isalnum(c) || c == ':' || c == '_') {
1003 		do {
1004 			*p++ = c;
1005 			if ((size_t)(p-buf) >= sizeof(buf)) {
1006 				yyerror("string too long");
1007 				return findeol();
1008 			}
1009 		} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
1010 		lungetc(c);
1011 		*p = '\0';
1012 		if ((token = lookup(buf)) == STRING)
1013 			yylval.v.string = xstrdup(buf);
1014 		return token;
1015 	}
1016 	if (c == '\n') {
1017 		yylval.lineno = file->lineno;
1018 		file->lineno++;
1019 	}
1020 	if (c == EOF)
1021 		return 0;
1022 	return c;
1023 }
1024 
1025 struct file *
1026 pushfile(const char *name, int secret)
1027 {
1028 	struct file	*nfile;
1029 
1030 	nfile = xcalloc(1, sizeof(*nfile));
1031 	nfile->name = xstrdup(name);
1032 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
1033 		log_warn("can't open %s", nfile->name);
1034 		free(nfile->name);
1035 		free(nfile);
1036 		return NULL;
1037 	}
1038 	nfile->lineno = TAILQ_EMPTY(&files) ? 1 : 0;
1039 	nfile->ungetsize = 16;
1040 	nfile->ungetbuf = xcalloc(1, nfile->ungetsize);
1041 	TAILQ_INSERT_TAIL(&files, nfile, entry);
1042 	return nfile;
1043 }
1044 
1045 int
1046 popfile(void)
1047 {
1048 	struct file	*prev;
1049 
1050 	if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
1051 		prev->errors += file->errors;
1052 
1053 	TAILQ_REMOVE(&files, file, entry);
1054 	fclose(file->stream);
1055 	free(file->name);
1056 	free(file->ungetbuf);
1057 	free(file);
1058 	file = prev;
1059 	return file ? 0 : EOF;
1060 }
1061 
1062 int
1063 parse_conf(struct conf *c, const char *filename)
1064 {
1065 	struct sym		*sym, *next;
1066 
1067 	default_host = NULL;
1068 	default_port = 1965;
1069 
1070 	conf = c;
1071 
1072 	file = pushfile(filename, 0);
1073 	if (file == NULL)
1074 		return -1;
1075 	topfile = file;
1076 
1077 	yyparse();
1078 	errors = file->errors;
1079 	popfile();
1080 
1081 	/* Free macros and check which have not been used. */
1082 	TAILQ_FOREACH_SAFE(sym, &symhead, entry, next) {
1083 		/* TODO: warn if !sym->used */
1084 		if (!sym->persist) {
1085 			free(sym->name);
1086 			free(sym->val);
1087 			TAILQ_REMOVE(&symhead, sym, entry);
1088 			free(sym);
1089 		}
1090 	}
1091 
1092 	if (errors)
1093 		return -1;
1094 	return 0;
1095 }
1096 
1097 int
1098 symset(const char *name, const char *val, int persist)
1099 {
1100 	struct sym *sym;
1101 
1102 	TAILQ_FOREACH(sym, &symhead, entry) {
1103 		if (!strcmp(name, sym->name))
1104 			break;
1105 	}
1106 
1107 	if (sym != NULL) {
1108 		if (sym->persist)
1109 			return 0;
1110 		else {
1111 			free(sym->name);
1112 			free(sym->val);
1113 			TAILQ_REMOVE(&symhead, sym, entry);
1114 			free(sym);
1115 		}
1116 	}
1117 
1118 	sym = xcalloc(1, sizeof(*sym));
1119 	sym->name = xstrdup(name);
1120 	sym->val = xstrdup(val);
1121 	sym->used = 0;
1122 	sym->persist = persist;
1123 
1124 	TAILQ_INSERT_TAIL(&symhead, sym, entry);
1125 	return 0;
1126 }
1127 
1128 int
1129 cmdline_symset(char *s)
1130 {
1131 	char	*sym, *val;
1132 	int	 ret;
1133 
1134 	if ((val = strrchr(s, '=')) == NULL)
1135 		return -1;
1136 	sym = xcalloc(1, val - s + 1);
1137 	memcpy(sym, s, val - s);
1138 	ret = symset(sym, val + 1, 1);
1139 	free(sym);
1140 	return ret;
1141 }
1142 
1143 char *
1144 symget(const char *nam)
1145 {
1146 	struct sym	*sym;
1147 
1148 	TAILQ_FOREACH(sym, &symhead, entry) {
1149 		if (strcmp(nam, sym->name) == 0) {
1150 			sym->used = 1;
1151 			return sym->val;
1152 		}
1153 	}
1154 	return NULL;
1155 }
1156 
1157 char *
1158 ensure_absolute_path(char *path)
1159 {
1160 	if (path == NULL || *path != '/')
1161 		yyerror("not an absolute path: %s", path);
1162 	return path;
1163 }
1164 
1165 int
1166 check_block_code(int n)
1167 {
1168 	if (n < 10 || n >= 70 || (n >= 20 && n <= 29))
1169 		yyerror("invalid block code %d", n);
1170 	return n;
1171 }
1172 
1173 char *
1174 check_block_fmt(char *fmt)
1175 {
1176 	char *s;
1177 
1178 	for (s = fmt; *s; ++s) {
1179 		if (*s != '%')
1180 			continue;
1181 		switch (*++s) {
1182 		case '%':
1183 		case 'p':
1184 		case 'q':
1185 		case 'P':
1186 		case 'N':
1187 			break;
1188 		default:
1189 			yyerror("invalid format specifier %%%c", *s);
1190 		}
1191 	}
1192 
1193 	return fmt;
1194 }
1195 
1196 int
1197 check_strip_no(int n)
1198 {
1199 	if (n <= 0)
1200 		yyerror("invalid strip number %d", n);
1201 	return n;
1202 }
1203 
1204 int
1205 check_prefork_num(int n)
1206 {
1207 	if (n <= 0 || n >= PROC_MAX_INSTANCES)
1208 		yyerror("invalid prefork number %d", n);
1209 	return n;
1210 }
1211 
1212 void
1213 advance_loc(void)
1214 {
1215 	loc = new_location();
1216 	TAILQ_INSERT_TAIL(&host->locations, loc, locations);
1217 }
1218 
1219 void
1220 advance_proxy(void)
1221 {
1222 	proxy = new_proxy();
1223 	TAILQ_INSERT_TAIL(&host->proxies, proxy, proxies);
1224 }
1225 
1226 int
1227 fastcgi_conf(const char *path, const char *port)
1228 {
1229 	struct fcgi	*f;
1230 	int		i = 0;
1231 
1232 	TAILQ_FOREACH(f, &conf->fcgi, fcgi) {
1233 		if (!strcmp(f->path, path) &&
1234 		    ((port == NULL && *f->port == '\0') ||
1235 		     !strcmp(f->port, port)))
1236 			return i;
1237 		++i;
1238 	}
1239 
1240 	f = xcalloc(1, sizeof(*f));
1241 	f->id = i;
1242 	(void)strlcpy(f->path, path, sizeof(f->path));
1243 	if (port != NULL)
1244 		(void)strlcpy(f->port, port, sizeof(f->port));
1245 	TAILQ_INSERT_TAIL(&conf->fcgi, f, fcgi);
1246 
1247 	return f->id;
1248 }
1249 
1250 void
1251 add_param(char *name, char *val)
1252 {
1253 	struct envlist *e;
1254 	struct envhead *h = &loc->params;
1255 
1256 	e = xcalloc(1, sizeof(*e));
1257 	(void) strlcpy(e->name, name, sizeof(e->name));
1258 	(void) strlcpy(e->value, val, sizeof(e->value));
1259 	TAILQ_INSERT_TAIL(h, e, envs);
1260 }
1261 
1262 int
1263 getservice(const char *n)
1264 {
1265 	struct servent	*s;
1266 	const char	*errstr;
1267 	long long	 llval;
1268 
1269 	llval = strtonum(n, 0, UINT16_MAX, &errstr);
1270 	if (errstr) {
1271 		s = getservbyname(n, "tcp");
1272 		if (s == NULL)
1273 			s = getservbyname(n, "udp");
1274 		if (s == NULL)
1275 			return (-1);
1276 		return (ntohs(s->s_port));
1277 	}
1278 
1279 	return ((unsigned short)llval);
1280 }
1281 
1282 static void
1283 add_to_addr_queue(struct addrhead *a, struct addrinfo *ai)
1284 {
1285 	struct address		*addr;
1286 	struct sockaddr_in	*sin;
1287 	struct sockaddr_in6	*sin6;
1288 
1289 	if (ai->ai_addrlen > sizeof(addr->ss))
1290 		fatalx("ai_addrlen larger than a sockaddr_storage");
1291 
1292 	TAILQ_FOREACH(addr, a, addrs) {
1293 		if (addr->ai_flags == ai->ai_flags &&
1294 		    addr->ai_family == ai->ai_family &&
1295 		    addr->ai_socktype == ai->ai_socktype &&
1296 		    addr->ai_protocol == ai->ai_protocol &&
1297 		    addr->slen == ai->ai_addrlen &&
1298 		    !memcmp(&addr->ss, ai->ai_addr, addr->slen))
1299 			return;
1300 	}
1301 
1302 	addr = xcalloc(1, sizeof(*addr));
1303 	addr->ai_flags = ai->ai_flags;
1304 	addr->ai_family = ai->ai_family;
1305 	addr->ai_socktype = ai->ai_socktype;
1306 	addr->ai_protocol = ai->ai_protocol;
1307 	addr->slen = ai->ai_addrlen;
1308 	memcpy(&addr->ss, ai->ai_addr, ai->ai_addrlen);
1309 
1310 	/* for commodity */
1311 	switch (addr->ai_family) {
1312 	case AF_INET:
1313 		sin = (struct sockaddr_in *)&addr->ss;
1314 		addr->port = ntohs(sin->sin_port);
1315 		break;
1316 	case AF_INET6:
1317 		sin6 = (struct sockaddr_in6 *)&addr->ss;
1318 		addr->port = ntohs(sin6->sin6_port);
1319 		break;
1320 	default:
1321 		fatalx("unknown socket family %d", addr->ai_family);
1322 	}
1323 
1324 	addr->sock = -1;
1325 
1326 	TAILQ_INSERT_HEAD(a, addr, addrs);
1327 }
1328 
1329 void
1330 listen_on(const char *hostname, const char *servname)
1331 {
1332 	struct addrinfo hints, *res, *res0;
1333 	int error;
1334 
1335 	memset(&hints, 0, sizeof(hints));
1336 	hints.ai_family = AF_UNSPEC;
1337 	hints.ai_socktype = SOCK_STREAM;
1338 	hints.ai_flags = AI_PASSIVE;
1339 	error = getaddrinfo(hostname, servname, &hints, &res0);
1340 	if (error) {
1341 		yyerror("listen on \"%s\" port %s: %s", hostname, servname,
1342 		    gai_strerror(errno));
1343 		return;
1344 	}
1345 
1346 	for (res = res0; res; res = res->ai_next) {
1347 		add_to_addr_queue(&host->addrs, res);
1348 		add_to_addr_queue(&conf->addrs, res);
1349 	}
1350 
1351 	freeaddrinfo(res0);
1352 }